Bump mold version to 2.4.1

Fixes https://github.com/rui314/mold/issues/1208

.github/workflows/build-all.yml

@@ -0,0 +1,45 @@
+name: Build all tarballs
+
+on:
+  schedule:
+    - cron: '0 0 * * *'
+  release:
+    types: [ published ]
+
+jobs:
+  build-tarballs:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        target: [ x86_64, aarch64, arm, riscv64, ppc64le, s390x ]
+
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+    - name: Checkout Repository
+      uses: actions/checkout@v2
+
+    - name: Login to GitHub Container Registry
+      uses: docker/login-action@v1
+      with:
+        registry: ghcr.io
+        username: ${{ github.repository_owner }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Set up QEMU
+      uses: docker/setup-qemu-action@v1
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+
+    - name: Build a tarball
+      run: ./dist.sh ${{ matrix.target }}
+
+    - name: Upload artifact
+      uses: actions/upload-artifact@v2
+      with:
+        name: tarballs
+        path: mold-*.tar.gz

.github/workflows/build-x86.yml

@@ -0,0 +1,36 @@
+name: Build x86 tarball
+
+on:
+  push:
+    branches: [ main ]
+
+jobs:
+  build-tarball:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+    - name: Checkout Repository
+      uses: actions/checkout@v2
+
+    - name: Login to GitHub Container Registry
+      uses: docker/login-action@v1
+      with:
+        registry: ghcr.io
+        username: ${{ github.repository_owner }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+
+    - name: Build a tarball
+      run: ./dist.sh
+
+    - name: Upload artifact
+      uses: actions/upload-artifact@v2
+      with:
+        name: tarball
+        path: mold-*.tar.gz

.github/workflows/ci.yml

@@ -18,12 +18,12 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
     - uses: actions/checkout@v3
-    - uses: rui314/setup-mold@staging
+    - uses: rui314/setup-mold@v1
     - name: install-build-deps
-      run: sudo ./install-build-deps.sh update
+      run: sudo ./install-build-deps.sh
     - name: ccache
       uses: hendrikmuhs/ccache-action@v1
-    - name: build and test
+    - name: build
       run: |
         echo "/usr/lib/ccache:/usr/local/opt/ccache/libexec" >> $GITHUB_PATH
         sudo apt-get install -y clang++-12
@@ -31,15 +31,18 @@ jobs:
         cd build
         cmake -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++-12 ${{ matrix.target }} ..
         cmake --build . -j$(nproc)
-        ctest . -j$(nproc)
+    - name: test
+      run: |
+        cd build
+        ctest -j$(nproc)
     - name: archive test results
       uses: actions/upload-artifact@v3
       if: failure()
       with:
         name: test-results-clang
         path: |
-          build/out
-          build/Testing
+          build
+          !build/CMakeFiles
 
   build-gcc:
     runs-on: ubuntu-20.04
@@ -47,16 +50,11 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: install-build-deps
+      shell: bash
       run: |
         # Install cross toolchains
-        dpkg --add-architecture i386
-        ./install-build-deps.sh update
-        apt-get install -y sudo qemu-user gdb zstd dwarfdump xz-utils {gcc,g++}-10-{i686,aarch64,riscv64,powerpc,powerpc64,powerpc64le,s390x,sparc64,m68k,sh4,alpha}-linux-gnu {gcc,g++}-10-arm-linux-gnueabihf
-
-        for i in {i686,aarch64,riscv64,powerpc,powerpc64,powerpc64le,s390x,sparc64,m68k,sh4,alpha}-linux-gnu arm-linux-gnueabihf; do
-          ln -sf /usr/bin/$i-gcc-10 /usr/bin/$i-gcc
-          ln -sf /usr/bin/$i-g++-10 /usr/bin/$i-g++
-        done
+        ./install-build-deps.sh
+        ./install-cross-tools.sh
 
         # Install a RV32 toolchain from third party since it's not available
         # as an Ubuntu package.
@@ -89,26 +87,27 @@ jobs:
 
         wget -O/usr/local/bin/qemu-loongarch64 -q https://github.com/loongson/build-tools/releases/download/2023.08.08/qemu-loongarch64
         chmod 755 /usr/local/bin/qemu-loongarch64
-
-      shell: bash
     - name: ccache
       uses: hendrikmuhs/ccache-action@v1
-    - name: build and test
+    - name: build
       run: |
         echo "/usr/lib/ccache:/usr/local/opt/ccache/libexec" >> $GITHUB_PATH
         mkdir build
         cd build
-        cmake -DMOLD_ENABLE_QEMU_TESTS=On -DMOLD_ENABLE_QEMU_TESTS_RV32=On -DMOLD_ENABLE_QEMU_TESTS_LOONGARCH=On ..
+        cmake ..
         cmake --build . -j$(nproc)
-        ctest . -j$(nproc)
+    - name: test
+      run: |
+        cd build
+        ctest -j$(nproc)
     - name: archive test results
       uses: actions/upload-artifact@v3
       if: failure()
       with:
         name: test-results-gcc
         path: |
-          build/out
-          build/Testing
+          build
+          !build/CMakeFiles
 
   build-macos:
     runs-on: macos-11
@@ -122,7 +121,7 @@ jobs:
     - uses: actions/checkout@v3
     - name: ccache
       uses: hendrikmuhs/ccache-action@v1
-    - name: build and test
+    - name: build
       run: |
         echo "/usr/lib/ccache:/usr/local/opt/ccache/libexec" >> $GITHUB_PATH
         mkdir build

.github/workflows/linux-packages.yml

@@ -1,15 +0,0 @@
-name: linux-packages
-on:
-  push:
-    branches: [ main ]
-jobs:
-  build:
-    runs-on: ubuntu-20.04
-    steps:
-    - uses: actions/checkout@v3
-    - name: build
-      run: ./dist.sh x86_64
-    - name: upload
-      uses: actions/upload-artifact@v3
-      with:
-        path: mold-*-linux.tar.gz

.github/workflows/update-manpage.yml

@@ -0,0 +1,32 @@
+# This file is generated by ChatGPT
+
+name: Update manpage
+
+on:
+  push:
+    paths:
+      - 'docs/mold.md'
+
+jobs:
+  update-manpage:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Check out repository
+      uses: actions/checkout@v2
+
+    - name: Install ronn
+      run: sudo apt-get install -y ronn
+
+    - name: Generate mold.1 from mold.md
+      run: ronn --roff docs/mold.md
+
+    - name: Configure Git
+      run: |
+        git config --global user.name 'Rui Ueyama'
+        git config --global user.email '[email protected]'
+
+    - name: Commit and push if mold.1 is updated
+      run: |
+        git add docs/mold.1
+        git diff --staged --quiet || (git commit -m "Update mold.1 (automated commit)" && git push)

CMakeLists.txt

@@ -1,31 +1,31 @@
 # You can customize a build by specifying CMake options. An option may be
 # given in the -Dvariable=value form. For a boolean variable, `ON` or `1`
-# means true while `OFF` or `0` means false.
+# means true, while `OFF` or `0` means false.
 #
 # Here are a couple of common cmake options:
 #
 #  -DCMAKE_C_COMPILER=<command-name>
 #
-#   Specifies a C compiler name to use. The default value is `cc`.
+#   Specifies the C compiler name to use. The default value is `cc`.
 #
 #  -DCMAKE_CXX_COMPILER=<command-name>
 #
-#   Specifies a C++ compiler name to use. The default value is `c++`.
+#   Specifies the C++ compiler name to use. The default value is `c++`.
 #
 #  -DCMAKE_INSTALL_PREFIX=<directory>
 #
-#   Specifies an install target directory. The default value is `/usr/local`.
+#   Specifies the install target directory. The default value is `/usr/local`.
 #
 #  -DCMAKE_BUILD_TYPE=[Debug | Release | RelWithDebInfo | MinSizeRel]
 #
-#   Specifies a build type. The default is `Release` which is the right
+#   Specifies the build type. The default is `Release`, which is the right
 #   option unless you are debugging mold.
 #
 # An example of a cmake command line is shown below:
 #
 #   $ cmake -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_CXX_COMPILER=g++-12 ..
 #
-# where `..` refers this directory.
+# where `..` refers to this directory.
 #
 # With cmake, you may run `cmake --install .` instead of `make install` to
 # install build artifacts to system directories. If you want to install
@@ -39,12 +39,12 @@
 # how to build mold. However, as a policy, we do not provide a way to
 # enable/disable any individual mold's feature. In other words, we do not
 # provide options like `--enable-foo` or `--disable-foo`. The motivation
-# behind it is build reproducibility. We want to guarantees that all builds
-# of the mold linker of the same version will have the exactly same set of
+# behind this is build reproducibility. We want to guarantee that all builds
+# of the mold linker of the same version will have the exact same set of
 # features and behave exactly the same.
 
 cmake_minimum_required(VERSION 3.14)
-project(mold VERSION 2.3.2)
+project(mold VERSION 2.4.1)
 
 include(CMakeDependentOption)
 include(GNUInstallDirs)
@@ -134,7 +134,7 @@ else()
   target_include_directories(mold PUBLIC third-party/blake3/c)
 endif()
 
-# Find zstd compression library. If libzstd.so is not found, we compile a
+# Find zstd compression library. If zstd.h is not found, we compile a
 # bundled one and statically-link it to mold.
 include(CheckIncludeFile)
 check_include_file(zstd.h HAVE_ZSTD_H)
@@ -212,11 +212,6 @@ else()
   mold_add_tbb()
 endif()
 
-# Check if this is a commercial version of mold (a.k.a. "sold")
-if(EXISTS "${CMAKE_SOURCE_DIR}/LICENSE.md")
-  set(MOLD_IS_SOLD ON)
-endif()
-
 # We always use Clang to build mold on Windows. MSVC can't compile mold.
 if(WIN32)
   if(MSVC AND NOT CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
@@ -351,14 +346,6 @@ foreach (SOURCE IN LISTS MOLD_ELF_TEMPLATE_FILES)
   endforeach()
 endforeach()
 
-if(MOLD_IS_SOLD)
-  foreach (SOURCE IN LISTS MOLD_MACHO_TEMPLATE_FILES)
-    foreach(TARGET IN LISTS MOLD_MACHO_TARGETS)
-      mold_instantiate_templates(${SOURCE} ${TARGET})
-    endforeach()
-  endforeach()
-endif()
-
 # Add other non-template source files.
 target_sources(mold PRIVATE
   common/compress.cc
@@ -388,29 +375,14 @@ target_sources(mold PRIVATE
   third-party/rust-demangle/rust-demangle.c
   )
 
-if(MOLD_IS_SOLD)
-  target_sources(mold PRIVATE
-    macho/arch-arm64.cc
-    macho/arch-x86-64.cc
-    macho/yaml.cc
-    )
-endif()
-
 # Add frequently included header files for pre-compiling.
 # target_precompile_headers is supported by CMake 3.16.0 or newer.
 if(${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.16.0")
-  if(MOLD_IS_SOLD)
-    target_precompile_headers(mold PRIVATE
-      "$<$<COMPILE_LANGUAGE:CXX>:${CMAKE_SOURCE_DIR}/elf/mold.h>"
-      "$<$<COMPILE_LANGUAGE:CXX>:${CMAKE_SOURCE_DIR}/macho/mold.h>")
-  else()
-    target_precompile_headers(mold PRIVATE
-      "$<$<COMPILE_LANGUAGE:CXX>:${CMAKE_SOURCE_DIR}/elf/mold.h>")
-  endif()
-
   # ccache needs this flag along with `sloppiness = pch_defines,time_macros`
   # to enable caching
-  target_compile_options(mold PRIVATE -fpch-preprocess)
+  if(NOT MSVC)
+    target_compile_options(mold PRIVATE -fpch-preprocess)
+  endif()
 endif()
 
 include(CTest)
@@ -424,22 +396,9 @@ if(BUILD_TESTING)
       BYPRODUCTS ld
       WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
       VERBATIM)
-
-    if(MOLD_IS_SOLD)
-      add_custom_command(
-        TARGET mold POST_BUILD
-        COMMAND ${CMAKE_COMMAND} -E create_symlink mold ld64
-        BYPRODUCTS ld64
-        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-        VERBATIM)
-    endif()
   endif()
 
-  if(${APPLE})
-    if(MOLD_IS_SOLD)
-      add_subdirectory(test/macho)
-    endif()
-  elseif(${UNIX})
+  if(${UNIX})
     add_subdirectory(test/elf)
   endif()
 endif()
@@ -473,13 +432,4 @@ if(NOT CMAKE_SKIP_INSTALL_RULES)
     ${CMAKE_INSTALL_BINDIR}/ld.mold${CMAKE_EXECUTABLE_SUFFIX})
   mold_install_relative_symlink(${CMAKE_INSTALL_MANDIR}/man1/mold.1
     ${CMAKE_INSTALL_MANDIR}/man1/ld.mold.1)
-
-  if(MOLD_IS_SOLD)
-    mold_install_relative_symlink(${CMAKE_INSTALL_BINDIR}/mold
-      ${CMAKE_INSTALL_BINDIR}/ld64.mold)
-    mold_install_relative_symlink(${CMAKE_INSTALL_BINDIR}/mold
-      ${CMAKE_INSTALL_BINDIR}/ld.sold)
-    mold_install_relative_symlink(${CMAKE_INSTALL_BINDIR}/mold
-      ${CMAKE_INSTALL_BINDIR}/ld64.sold)
-  endif()
 endif()

README.md

@@ -1,30 +1,25 @@
 # mold: A Modern Linker
 
-<i>This repository contains a free version of the mold linker.
-If you are looking for a commercial version that supports macOS
-please visit the
-[repository of the sold linker](https://github.com/bluewhalesystems/sold).</i>
-
 mold is a faster drop-in replacement for existing Unix linkers. It is several
 times quicker than the LLVM lld linker, the second-fastest open-source linker,
 which I initially developed a few years ago. mold aims to enhance developer
 productivity by minimizing build time, particularly in rapid
 debug-edit-rebuild cycles.
 
-Here is a performance comparison of GNU gold, LLVM lld, and mold when linking
-final debuginfo-enabled executables for major large programs on a simulated
-8-core, 16-thread machine.
+Here is a performance comparison of GNU ld, GNU gold, LLVM lld, and
+mold when linking final debuginfo-enabled executables for major large
+programs on a simulated 16-core, 32-thread machine.
 
-![Link speed comparison](docs/comparison.png)
+![Link speed comparison](docs/chart.svg)
 
-| Program (linker output size)  | GNU gold | LLVM lld | mold
-|-------------------------------|----------|----------|--------
-| Chrome 96 (1.89 GiB)          | 53.86s   | 11.74s   | 2.21s
-| Clang 13 (3.18 GiB)           | 64.12s   | 5.82s    | 2.90s
-| Firefox 89 libxul (1.64 GiB)  | 32.95s   | 6.80s    | 1.42s
+| Program (linker output size)  | GNU ld | GNU gold | LLVM lld | mold
+|-------------------------------|--------|----------|----------|------
+| MySQL 8.3 (0.47 GiB)          | 10.84s | 7.47s    | 1.64s    | 0.46s
+| Clang 19 (1.56 GiB)           | 42.07s | 33.13s   | 5.20s    | 1.35s
+| Chromium 124 (1.35 GiB)       | N/A    | 27.40s   | 6.10s    | 1.52s
 
 mold is so fast that it is only 2x _slower_ than the `cp` command on the same
-machine. If you find that mold is not faster than other linkers, please feel
+machine. If you find that mold is not faster than other linkers, feel
 free to [file a bug report](https://github.com/rui314/mold/issues).
 
 mold supports x86-64, i386, ARM64, ARM32, 64-bit/32-bit little/big-endian
@@ -32,9 +27,6 @@ RISC-V, 32-bit PowerPC, 64-bit big-endian PowerPC ELFv1, 64-bit little-endian
 PowerPC ELFv2, s390x, 64-bit/32-bit LoongArch, SPARC64, m68k, SH-4, and DEC
 Alpha.
 
-mold/macOS is commercial software. For mold/macOS, please visit
-https://github.com/bluewhalesystems/sold.
-
 ## Why does linking speed matter?
 
 If you are using a compiled language such as C, C++, or Rust, a build consists
@@ -71,7 +63,7 @@ necessary packages. You may need to run it as root.
 git clone https://github.com/rui314/mold.git
 mkdir mold/build
 cd mold/build
-git checkout v2.3.2
+git checkout v2.4.1
 ../install-build-deps.sh
 cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_COMPILER=c++ ..
 cmake --build . -j $(nproc)
@@ -255,13 +247,14 @@ following people and organizations who have sponsored $128/month or more:
 
 <a href="https://www.emergetools.com"><img src="docs/emerge-tools-logo.png" align=center height=120 width=240 alt="Emerge Tools"></a><br>
 
-- [Uber](https://uber.com)
 - [G-Research](https://www.gresearch.co.uk)
 - [Signal Slot Inc.](https://github.com/signal-slot)
+- [GlareDB](https://github.com/GlareDB)
 
 ### Individual sponsors
 
-- [300baud](https://github.com/300baud)
-- [Johan Andersson](https://github.com/repi)
 - [Wei Wu](https://github.com/lazyparser)
 - [kyle-elliott](https://github.com/kyle-elliott)
+- [Bryant Biggs](https://github.com/bryantbiggs)
+- [kraptor23](https://github.com/kraptor23)
+- [Jinkyu Yi](https://github.com/jincreator)

common/common.h

@@ -216,7 +216,7 @@ struct Atomic : std::atomic<T> {
 
   using std::atomic<T>::atomic;
 
-  Atomic(const Atomic<T> &other) { store(other.load()); }
+  Atomic(const Atomic<T> &other) : std::atomic<T>(other.load()) {}
 
   Atomic<T> &operator=(const Atomic<T> &other) {
     store(other.load());
@@ -565,7 +565,7 @@ public:
   }
 
   ~ConcurrentMap() {
-    free(entries);
+    free(entries_buf);
   }
 
   // In order to avoid unnecessary cache-line false sharing, we want
@@ -579,19 +579,14 @@ public:
 
   void resize(i64 nbuckets) {
     this->nbuckets = std::max<i64>(MIN_NBUCKETS, bit_ceil(nbuckets));
+    free(entries_buf);
 
-    i64 sz = sizeof(Entry) * this->nbuckets;
-    free(entries);
-
-#if _WIN32
     // Even though std::aligned_alloc is defined in C++17, MSVC doesn't
-    // seem to provide that function.
-    entries = (Entry *)_aligned_malloc(sz, alignof(Entry));
-#else
-    entries = (Entry *)std::aligned_alloc(alignof(Entry), sz);
-#endif
-
-    memset(entries, 0, sz);
+    // seem to provide that function. C11's aligned_alloc may not be always
+    // avialalbe. Therefore, we'll align the buffer ourselves.
+    i64 size = sizeof(Entry) * this->nbuckets;
+    entries_buf = calloc(1, size + alignof(Entry) - 1);
+    entries = (Entry *)align_to((u64)entries_buf, alignof(Entry));
   }
 
   std::pair<T *, bool> insert(std::string_view key, u64 hash, const T &val) {
@@ -699,6 +694,7 @@ public:
   static constexpr i64 NUM_SHARDS = 16;
   static constexpr i64 MAX_RETRY = 128;
 
+  void *entries_buf = nullptr;
   Entry *entries = nullptr;
   i64 nbuckets = 0;
 
@@ -759,10 +755,19 @@ public:
     if (this->path == "-") {
       fp = stdout;
     } else {
+#ifdef _WIN32
+      int pmode = (perm & 0200) ? (_S_IREAD | _S_IWRITE) : _S_IREAD;
+      i64 fd = _open(this->path.c_str(), _O_RDWR | _O_CREAT | _O_BINARY, pmode);
+#else
       i64 fd = ::open(this->path.c_str(), O_RDWR | O_CREAT, perm);
+#endif
       if (fd == -1)
         Fatal(ctx) << "cannot open " << this->path << ": " << errno_string();
+#ifdef _WIN32
+      fp = _fdopen(fd, "wb");
+#else
       fp = fdopen(fd, "w");
+#endif
     }
 
     fwrite(this->buf, this->filesize, 1, fp);
@@ -832,13 +837,13 @@ private:
 
 class MultiGlob {
 public:
-  bool add(std::string_view pat, u32 val);
+  bool add(std::string_view pat, i64 val);
   bool empty() const { return strings.empty(); }
-  std::optional<u32> find(std::string_view str);
+  std::optional<i64> find(std::string_view str);
 
 private:
   struct TrieNode {
-    u32 value = -1;
+    i64 value = -1;
     TrieNode *suffix_link = nullptr;
     std::unique_ptr<TrieNode> children[256];
   };
@@ -849,7 +854,7 @@ private:
 
   std::vector<std::string> strings;
   std::unique_ptr<TrieNode> root;
-  std::vector<std::pair<Glob, u32>> globs;
+  std::vector<std::pair<Glob, i64>> globs;
   std::once_flag once;
   bool is_compiled = false;
 };
@@ -877,8 +882,8 @@ std::filesystem::path to_abs_path(std::filesystem::path path);
 // demangle.cc
 //
 
-std::string_view demangle(std::string_view name);
-std::optional<std::string_view> cpp_demangle(std::string_view name);
+std::optional<std::string_view> demangle_cpp(std::string_view name);
+std::optional<std::string_view> demangle_rust(std::string_view name);
 
 //
 // compress.cc
@@ -995,13 +1000,52 @@ MappedFile<Context> *MappedFile<Context>::open(Context &ctx, std::string path) {
   if (path.starts_with('/') && !ctx.arg.chroot.empty())
     path = ctx.arg.chroot + "/" + path_clean(path);
 
-  i64 fd;
 #ifdef _WIN32
-  fd = ::_open(path.c_str(), O_RDONLY);
-#else
-  fd = ::open(path.c_str(), O_RDONLY);
-#endif
+  HANDLE file_handle =
+      CreateFileA(path.c_str(), GENERIC_READ,
+                  FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+                  nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);
+  if (file_handle == INVALID_HANDLE_VALUE) {
+    auto err = GetLastError();
+    if (err != ERROR_FILE_NOT_FOUND)
+      Fatal(ctx) << "opening " << path << " failed: " << err;
+    return nullptr;
+  }
 
+  if (GetFileType(file_handle) != FILE_TYPE_DISK) {
+    CloseHandle(file_handle);
+    return nullptr;
+  }
+
+  DWORD size_hi;
+  DWORD size_lo = GetFileSize(file_handle, &size_hi);
+  if (size_lo == INVALID_FILE_SIZE)
+    Fatal(ctx) << path << ": GetFileSize failed: " << GetLastError();
+
+  u64 size = ((u64)size_hi << 32) + size_lo;
+
+  MappedFile *mf = new MappedFile;
+  ctx.mf_pool.push_back(std::unique_ptr<MappedFile>(mf));
+
+  mf->name = path;
+  mf->size = size;
+  mf->file_handle = file_handle;
+
+  if (size > 0) {
+    HANDLE mapping_handle = CreateFileMapping(file_handle, nullptr,
+                                              PAGE_READONLY, 0, size, nullptr);
+    if (!mapping_handle)
+      Fatal(ctx) << path << ": CreateFileMapping failed: " << GetLastError();
+
+    mf->data = (u8 *)MapViewOfFile(mapping_handle, FILE_MAP_COPY, 0, 0, size);
+    CloseHandle(mapping_handle);
+    if (!mf->data)
+      Fatal(ctx) << path << ": MapViewOfFile failed: " << GetLastError();
+  }
+
+  return mf;
+#else
+  i64 fd = ::open(path.c_str(), O_RDONLY);
   if (fd == -1) {
     if (errno != ENOENT)
       Fatal(ctx) << "opening " << path << " failed: " << errno_string();
@@ -1019,26 +1063,15 @@ MappedFile<Context> *MappedFile<Context>::open(Context &ctx, std::string path) {
   mf->size = st.st_size;
 
   if (st.st_size > 0) {
-#ifdef _WIN32
-    HANDLE handle = CreateFileMapping((HANDLE)_get_osfhandle(fd),
-                                      nullptr, PAGE_READWRITE, 0,
-                                      st.st_size, nullptr);
-    if (!handle)
-      Fatal(ctx) << path << ": CreateFileMapping failed: " << GetLastError();
-    mf->file_handle = handle;
-    mf->data = (u8 *)MapViewOfFile(handle, FILE_MAP_ALL_ACCESS, 0, 0, st.st_size);
-    if (!mf->data)
-      Fatal(ctx) << path << ": MapViewOfFile failed: " << GetLastError();
-#else
     mf->data = (u8 *)mmap(nullptr, st.st_size, PROT_READ | PROT_WRITE,
                           MAP_PRIVATE, fd, 0);
     if (mf->data == MAP_FAILED)
       Fatal(ctx) << path << ": mmap failed: " << errno_string();
-#endif
   }
 
   close(fd);
   return mf;
+#endif
 }
 
 template <typename Context>

common/config.h.in

@@ -1,3 +1,2 @@
 #define MOLD_VERSION "@mold_VERSION@"
 #define MOLD_LIBDIR "@CMAKE_INSTALL_FULL_LIBDIR@"
-#cmakedefine01 MOLD_IS_SOLD

common/demangle.cc

@@ -10,25 +10,7 @@
 
 namespace mold {
 
-std::string_view demangle(std::string_view name) {
-  static thread_local char *p;
-  if (p)
-    free(p);
-
-  // Try to demangle as a Rust symbol. Since legacy-style Rust symbols
-  // are also valid as a C++ mangled name, we need to call this before
-  // cpp_demangle.
-  p = rust_demangle(std::string(name).c_str(), 0);
-  if (p)
-    return p;
-
-  // Try to demangle as a C++ symbol.
-  if (std::optional<std::string_view> s = cpp_demangle(name))
-    return *s;
-  return name;
-}
-
-std::optional<std::string_view> cpp_demangle(std::string_view name) {
+std::optional<std::string_view> demangle_cpp(std::string_view name) {
   static thread_local char *buf;
   static thread_local size_t buflen;
 
@@ -48,4 +30,13 @@ std::optional<std::string_view> cpp_demangle(std::string_view name) {
   return {};
 }
 
+std::optional<std::string_view> demangle_rust(std::string_view name) {
+  static thread_local char *buf;
+  free(buf);
+  buf = rust_demangle(std::string(name).c_str(), 0);
+  if (buf)
+    return buf;
+  return {};
+}
+
 } // namespace mold

common/filetype.h

@@ -53,7 +53,7 @@ inline bool is_gcc_lto_obj(Context &ctx, MappedFile *mf) {
     if (!ctx.arg.plugin.empty()) {
       std::string_view name = data + shdrs[shstrtab_idx].sh_offset + sec.sh_name;
       if (name.starts_with(".gnu.lto_.symtab."))
-      return true;
+        return true;
     }
 
     if (sec.sh_type != SHT_SYMTAB)

common/glob.cc

@@ -79,6 +79,14 @@ std::optional<Glob> Glob::compile(std::string_view pat) {
     case '*':
       vec.push_back({STAR});
       break;
+    case '\\':
+      if (pat.empty())
+        return {};
+      if (vec.empty() || vec.back().kind != STRING)
+        vec.push_back({STRING});
+      vec.back().str += pat[0];
+      pat = pat.substr(1);
+      break;
     default:
       if (vec.empty() || vec.back().kind != STRING)
         vec.push_back({STRING});
@@ -101,7 +109,7 @@ bool Glob::do_match(std::string_view str, std::span<Element> elements) {
 
     switch (e.kind) {
     case STRING:
-      if (str.empty() || !str.starts_with(e.str))
+      if (!str.starts_with(e.str))
         return false;
       str = str.substr(e.str.size());
       break;

common/main.cc

@@ -5,16 +5,26 @@
 #include <filesystem>
 #include <signal.h>
 #include <tbb/global_control.h>
+#include <tbb/version.h>
 
 #ifdef USE_SYSTEM_MIMALLOC
 #include <mimalloc-new-delete.h>
 #endif
 
+#ifdef __APPLE__
+#include <mach-o/dyld.h>
+#endif
+
 #ifdef __FreeBSD__
 # include <sys/sysctl.h>
 # include <unistd.h>
 #endif
 
+#ifdef _WIN32
+# define unlink _unlink
+# define write _write
+#endif
+
 namespace mold {
 
 std::string mold_version_string = MOLD_VERSION;
@@ -28,10 +38,10 @@ int main(int argc, char **argv);
 }
 
 static std::string get_mold_version() {
-  std::string name = MOLD_IS_SOLD ? "mold (sold) " : "mold ";
   if (mold_git_hash.empty())
-    return name + MOLD_VERSION + " (compatible with GNU ld)";
-  return name + MOLD_VERSION + " (" + mold_git_hash + "; compatible with GNU ld)";
+    return "mold "s + MOLD_VERSION + " (compatible with GNU ld)";
+  return "mold "s + MOLD_VERSION + " (" + mold_git_hash +
+         "; compatible with GNU ld)";
 }
 
 void cleanup() {
@@ -48,7 +58,15 @@ std::string errno_string() {
 
 // Returns the path of the mold executable itself
 std::string get_self_path() {
-#ifdef __FreeBSD__
+#if __APPLE__
+    char path[8192];
+    u32 size = sizeof(path);
+    if (_NSGetExecutablePath(path, &size)) {
+      std::cerr << "_NSGetExecutablePath failed\n";
+      exit(1);
+    }
+    return path;
+#elif __FreeBSD__
   // /proc may not be mounted on FreeBSD. The proper way to get the
   // current executable's path is to use sysctl(2).
   int mib[4];
@@ -106,6 +124,8 @@ void install_signal_handler() {
 
 #else
 
+static std::string sigabrt_msg;
+
 static void sighandler(int signo, siginfo_t *info, void *ucontext) {
   static std::mutex mu;
   std::scoped_lock lock{mu};
@@ -120,12 +140,7 @@ static void sighandler(int signo, siginfo_t *info, void *ucontext) {
     }
     break;
   case SIGABRT: {
-    const char msg[] =
-      "mold: aborted\n"
-      "mold: If mold failed due to a spurious failure of pthread_create, "
-      "it's likely because of https://github.com/oneapi-src/oneTBB/pull/824. "
-      "You should ensure that you are using 2021.9.0 or newer version of libtbb.\n";
-    (void)!write(STDERR_FILENO, msg, sizeof(msg) - 1);
+    (void)!write(STDERR_FILENO, &sigabrt_msg[0], sigabrt_msg.size());
     break;
   }
   }
@@ -139,10 +154,20 @@ void install_signal_handler() {
   sigemptyset(&action.sa_mask);
   action.sa_flags = SA_SIGINFO;
 
-  sigaction(SIGABRT, &action, NULL);
   sigaction(SIGINT, &action, NULL);
   sigaction(SIGTERM, &action, NULL);
   sigaction(SIGBUS, &action, NULL);
+
+  // OneTBB 2021.9.0 has the interface version 12090.
+  if (TBB_runtime_interface_version() < 12090) {
+    sigabrt_msg = "mold: aborted\n"
+      "mold: mold with libtbb version 2021.9.0 or older is known to be unstable "
+      "under heavy load. Your libtbb version is " +
+      std::string(TBB_runtime_version()) +
+      ". Please upgrade your libtbb library and try again.\n";
+
+    sigaction(SIGABRT, &action, NULL);
+  }
 }
 
 #endif
@@ -158,12 +183,5 @@ i64 get_default_thread_count() {
 
 int main(int argc, char **argv) {
   mold::mold_version = mold::get_mold_version();
-
-#if MOLD_IS_SOLD
-  std::string cmd = mold::filepath(argv[0]).filename().string();
-  if (cmd == "ld64" || cmd.starts_with("ld64."))
-    return mold::macho::main(argc, argv);
-#endif
-
   return mold::elf::main(argc, argv);
 }

common/multi-glob.cc

@@ -24,9 +24,9 @@
 
 namespace mold {
 
-std::optional<u32> MultiGlob::find(std::string_view str) {
+std::optional<i64> MultiGlob::find(std::string_view str) {
   std::call_once(once, [&] { compile(); });
-  u32 val = UINT32_MAX;
+  i64 val = -1;
 
   if (root) {
     // Match against simple glob patterns
@@ -36,7 +36,7 @@ std::optional<u32> MultiGlob::find(std::string_view str) {
       for (;;) {
         if (node->children[c]) {
           node = node->children[c].get();
-          val = std::min(val, node->value);
+          val = std::max(val, node->value);
           return;
         }
 
@@ -53,11 +53,11 @@ std::optional<u32> MultiGlob::find(std::string_view str) {
   }
 
   // Match against complex glob patterns
-  for (std::pair<Glob, u32> &glob : globs)
+  for (std::pair<Glob, i64> &glob : globs)
     if (glob.first.match(str))
-      val = std::min(val, glob.second);
+      val = std::max(val, glob.second);
 
-  if (val == UINT32_MAX)
+  if (val == -1)
     return {};
   return val;
 }
@@ -82,7 +82,7 @@ static std::string handle_stars(std::string_view pat) {
   return "\0"s + str + "\0"s;
 }
 
-bool MultiGlob::add(std::string_view pat, u32 val) {
+bool MultiGlob::add(std::string_view pat, i64 val) {
   assert(!is_compiled);
   assert(!pat.empty());
 
@@ -108,7 +108,7 @@ bool MultiGlob::add(std::string_view pat, u32 val) {
     node = node->children[c].get();
   }
 
-  node->value = std::min(node->value, val);
+  node->value = std::max(node->value, val);
   return true;
 }
 
@@ -157,7 +157,7 @@ void MultiGlob::fix_values() {
     for (std::unique_ptr<TrieNode> &child : node->children) {
       if (!child)
         continue;
-      child->value = std::min(child->value, child->suffix_link->value);
+      child->value = std::max(child->value, child->suffix_link->value);
       queue.push(child.get());
     }
   } while (!queue.empty());

common/output-file-unix.h

@@ -39,11 +39,16 @@ open_or_create_file(Context &ctx, std::string path, i64 filesize, i64 perm) {
       Fatal(ctx) << "cannot open " << path2 << ": " << errno_string();
   }
 
-  if (ftruncate(fd, filesize))
-    Fatal(ctx) << "ftruncate failed: " << errno_string();
-
   if (fchmod(fd, (perm & ~get_umask())) == -1)
     Fatal(ctx) << "fchmod failed: " << errno_string();
+
+#ifdef __linux__
+  if (fallocate(fd, 0, 0, filesize) == 0)
+    return {fd, path2};
+#endif
+
+  if (ftruncate(fd, filesize) == -1)
+    Fatal(ctx) << "ftruncate failed: " << errno_string();
   return {fd, path2};
 }
 

common/perf.cc

@@ -38,7 +38,7 @@ static i64 now_nsec() {
 static std::pair<i64, i64> get_usage() {
 #ifdef _WIN32
   auto to_nsec = [](FILETIME t) -> i64 {
-    return ((u64)t.dwHighDateTime << 32 + (u64)t.dwLowDateTime) * 100;
+    return (((u64)t.dwHighDateTime << 32) + (u64)t.dwLowDateTime) * 100;
   };
 
   FILETIME creation, exit, kernel, user;

dist.sh

@@ -1,78 +1,169 @@
 #!/bin/bash
 #
-# This script creates a mold binary distribution. The output is
-# written in this directory as `mold-$version-$arch-linux.tar.gz`
-# (e.g. `mold-1.0.3-x86_64-linux.tar.gz`).
+# This script creates a mold binary distribution. The output is written in
+# this directory as `mold-$version-$arch-linux.tar.gz` (e.g.,
+# `mold-1.0.3-x86_64-linux.tar.gz`).
 #
-# The mold executable created by this script is statically-linked to
-# libstdc++ and libcrypto but dynamically-linked to libc, libm, libz
-# and librt, as they almost always exist on any Linux systems.
+# The mold executable created by this script is statically linked to
+# libstdc++ but dynamically linked to libc, libm, libz, and librt, as
+# these libraries almost always exist on any Linux system. We can't
+# statically link libc because doing so would disable dlopen(), which is
+# necessary to open the LTO linker plugin.
+#
+# This script aims to produce reproducible outputs. That means if you run
+# the script twice on the same git commit, it should produce bit-by-bit
+# identical binary files. This property is crucial as a countermeasure
+# against supply chain attacks. With this, you can verify that the binary
+# files distributed on the GitHub release pages are created from the
+# commit with release tags by rebuilding the binaries yourself.
+#
+# Debian provides snapshot.debian.org to host all historical binary
+# packages. We use it to construct Docker images pinned to a
+# particular timestamp.
+#
+# We aim to use a reasonably old Debian version because we'll dynamically
+# link glibc to mold, and a binary linked against a newer version of glibc
+# won't work on a system with an older version of glibc.
+#
+# We need GCC 10 or newer to build mold. If GCC 10 is not available on an
+# old Debian version, we'll build it ourselves.
+#
+# You may need to run the following command to use Docker with Qemu:
+#
+#  $ docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
 
 set -e -x
+cd "$(dirname $0)"
+
+usage() {
+  echo "Usage: $0 [ x86_64 | aarch64 | arm | riscv64 | ppc64le | s390x ]"
+  exit 1
+}
 
 case $# in
 0)
   arch=$(uname -m)
-  [[ $arch = arm* ]] && arch=arm
+  if [ $arch = arm64 ]; then
+    arch=aarch64
+  elif [[ $arch = arm* ]]; then
+    arch=arm
+  fi
   ;;
 1)
   arch="$1"
   ;;
 *)
-  echo "Usage: $0 [ x86_64 | aarch64 | arm | riscv64 | ppc64le | s390x ]"
-  exit 1
+  usage
 esac
 
-echo "$arch" | grep -Eq '^(x86_64|aarch64|arm|riscv64|ppc64le|s390x)$' || \
-  { echo "Error: no docker image for $arch"; exit 1; }
+echo "$arch" | grep -Eq '^(x86_64|aarch64|arm|riscv64|ppc64le|s390x)$' || usage
 
-image=mold-builder-$arch:1
-version=$(sed -n 's/^project(mold VERSION \(.*\))/\1/p' $(dirname $0)/CMakeLists.txt)
+version=$(sed -n 's/^project(mold VERSION \(.*\))/\1/p' CMakeLists.txt)
 dest=mold-$version-$arch-linux
 
-# Create a Docker image if not exists.
-#
-# We want to use a reasonably old Linux distro because we'll dynamically
-# link glibc to mold, and a binary linked against a newer version of
-# glibc won't work on a system with a older version of glibc.
-#
-# We might want to instead statically-link everything, but that'll
-# disable dlopen(), which means we can't use the linker plugin for LTO.
-# So we don't want to do that.
-if ! docker image ls $image | grep -q $image; then
-  if [ $arch = riscv64 ]; then
-    # Ubuntu 18 didn't support RISC-V, so use Ubuntu 20 instead
-    cat <<EOF | docker build --platform $arch -t $image -
-FROM riscv64/ubuntu:20.04
-RUN apt-get update && \
-  DEBIAN_FRONTEND=noninteractive TZ=UTC apt-get install -y --no-install-recommends build-essential gcc-10 g++-10 cmake && \
-  rm -rf /var/lib/apt/lists
-EOF
-  else
-    cat <<EOF | docker build --platform $arch -t $image -
-FROM ubuntu:18.04
-RUN apt-get update && \
-  apt-get install -y --no-install-recommends software-properties-common && \
-  add-apt-repository -y ppa:ubuntu-toolchain-r/test && \
-  apt-get update && \
-  DEBIAN_FRONTEND=noninteractive TZ=UTC apt-get install -y --no-install-recommends build-essential wget libstdc++-11-dev gcc-10 g++-10 python3 libssl-dev && \
-  \
-  mkdir /cmake && cd /cmake && \
-  wget -O- -q https://github.com/Kitware/CMake/releases/download/v3.24.2/cmake-3.24.2.tar.gz | tar --strip-components=1 -xzf - && \
-  ./bootstrap --parallel=$(nproc) && make -j$(nproc) && make -j$(nproc) install && \
-  rm -rf /var/lib/apt/lists /cmake
-EOF
-  fi
+if [ "$GITHUB_REPOSITORY" = '' ]; then
+  image=mold-builder-$arch
+  docker_build="docker build --platform linux/$arch -t $image -"
+else
+  # If this script is running on GitHub Actions, we want to cache
+  # the created Docker image in GitHub's Docker repostiory.
+  image=ghcr.io/$GITHUB_REPOSITORY/mold-builder-$arch
+  docker_build="docker buildx build --platform linux/$arch -t $image --push --cache-to type=inline --cache-from type=registry,ref=ghcr.io/$GITHUB_REPOSITORY/mold-builder-$arch -"
 fi
 
+# Create a Docker image.
+case $arch in
+x86_64)
+  # Debian 8 (Jessie) released in April 2015
+  cat <<EOF | $docker_build
+FROM debian:jessie-20210326@sha256:32ad5050caffb2c7e969dac873bce2c370015c2256ff984b70c1c08b3a2816a0
+ENV DEBIAN_FRONTEND=noninteractive TZ=UTC
+RUN sed -i -e '/^deb/d' -e 's/^# deb /deb [trusted=yes] /g' /etc/apt/sources.list && \
+  echo 'Acquire::Retries "10"; Acquire::http::timeout "10"; Acquire::Check-Valid-Until "false";' > /etc/apt/apt.conf.d/80-retries && \
+  apt-get update && \
+  apt-get install -y --no-install-recommends wget bzip2 file make autoconf gcc g++ libssl-dev && \
+  rm -rf /var/lib/apt/lists
+
+# Build CMake 3.27
+RUN mkdir -p /build/cmake && \
+  cd /build/cmake && \
+  wget -O- --no-check-certificate https://cmake.org/files/v3.27/cmake-3.27.7.tar.gz | tar xzf - --strip-components=1 && \
+  ./bootstrap --parallel=\$(nproc) && \
+  make -j\$(nproc) && \
+  make install && \
+  rm -rf /build
+
+# Build GCC 10
+RUN mkdir -p /build/gcc && \
+  cd /build/gcc && \
+  wget -O- http://ftp.gnu.org/gnu/gcc/gcc-10.5.0/gcc-10.5.0.tar.gz | tar xzf - --strip-components=1 && \
+  mkdir isl gmp mpc mpfr && \
+  wget -O- http://gcc.gnu.org/pub/gcc/infrastructure/isl-0.18.tar.bz2 | tar xjf - --strip-components=1 -C isl && \
+  wget -O- http://ftp.gnu.org/gnu/gmp/gmp-6.1.2.tar.bz2 | tar xjf - --strip-components=1 -C gmp && \
+  wget -O- http://ftp.gnu.org/gnu/mpc/mpc-1.2.1.tar.gz | tar xzf - --strip-components=1 -C mpc && \
+  wget -O- http://ftp.gnu.org/gnu/mpfr/mpfr-4.1.0.tar.gz | tar xzf - --strip-components=1 -C mpfr && \
+  ./configure --prefix=/usr --enable-languages=c,c++ --disable-bootstrap --disable-multilib && \
+  make -j\$(nproc) && \
+  make install && \
+  ln -sf /usr/lib64/libstdc++.so.6 /usr/lib/x86_64-linux-gnu/libstdc++.so.6 && \
+  rm -rf /build
+EOF
+  ;;
+aarch64 | arm | ppc64le | s390x)
+  # Debian 10 (Bullseye) released in July 2019
+  #
+  # We don't want to build GCC for these targets with Qemu becuase
+  # that'd take extremely long time. Also I believe old build machines
+  # are usually x86-64.
+  [ $arch = aarch64 ] && digest=d5ed76c5265576982e6599b6f12392290d9b52b315b19b28b640aaba6e8af002
+  [ $arch = arm ]     && digest=bede2623dae269454c5b6dd4af15a10810a5f4ef75963d4eb6531628f98bd633
+  [ $arch = ppc64le ] && digest=255f385e735469493b3465befad59a16f9d46f41d0b50e4fa6d5928c5ee7702a
+  [ $arch = s390x ]   && digest=96fb9ce5d3ce7f3dab7c34c18edfee093904cbc7fc19162dbcca22b2cc273b9d
+
+  cat <<EOF | $docker_build
+FROM debian:bullseye-20231030@sha256:$digest
+ENV DEBIAN_FRONTEND=noninteractive TZ=UTC
+RUN sed -i -e '/^deb/d' -e 's/^# deb /deb [trusted=yes] /g' /etc/apt/sources.list && \
+  echo 'Acquire::Retries "10"; Acquire::http::timeout "10"; Acquire::Check-Valid-Until "false";' > /etc/apt/apt.conf.d/80-retries && \
+  apt-get update && \
+  apt-get install -y --no-install-recommends build-essential gcc-10 g++-10 cmake && \
+  ln -sf /usr/bin/gcc-10 /usr/bin/cc && \
+  ln -sf /usr/bin/g++-10 /usr/bin/c++ && \
+  rm -rf /var/lib/apt/lists
+EOF
+  ;;
+riscv64)
+  # snapshot.debian.org is not available for RISC-V binaries
+  cat <<EOF | $docker_build
+FROM riscv64/debian:unstable-20231030@sha256:be1882409392c1f68f23e1e04bd965c49398f4a358b1a15f7b1820c0b39ede5b
+ENV DEBIAN_FRONTEND=noninteractive TZ=UTC
+RUN apt-get update && \
+  apt-get install -y --no-install-recommends build-essential gcc-12 g++-12 cmake && \
+  ln -sf /usr/bin/gcc-12 /usr/bin/cc && \
+  ln -sf /usr/bin/g++-12 /usr/bin/c++ && \
+  rm -rf /var/lib/apt/lists
+EOF
+  ;;
+esac
+
+# Source tarballs available on GitHub don't contain .git history.
+# Clone the repo if missing.
+[ -d .git ] || git clone --branch v$version --depth 1 --bare https://github.com/rui314/mold .git
+
+# We use the timestamp of the last Git commit as the file timestamp
+# for build artifacts.
+timestamp="$(git log -1 --format=%ci)"
+
 # Build mold in a container.
-docker run --platform linux/$arch -i --rm -v "$(realpath $(dirname $0)):/mold" \
-  -e "OWNER=$(id -u):$(id -g)" $image \
-  bash -c "mkdir /build &&
-cd /build &&
-cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=gcc-10 -DCMAKE_CXX_COMPILER=g++-10 -DMOLD_MOSTLY_STATIC=On /mold &&
-cmake --build . -j\$(nproc) &&
-[ $arch = arm ] || ctest -j\$(nproc) &&
-cmake --install . --prefix $dest --strip &&
-tar czf /mold/$dest.tar.gz $dest &&
-chown \$OWNER /mold/$dest.tar.gz"
+docker run --platform linux/$arch -i --rm -v "$(pwd):/mold" $image bash -c "
+set -e
+mkdir -p /build/mold
+cd /build/mold
+cmake -DCMAKE_BUILD_TYPE=Release -DMOLD_MOSTLY_STATIC=On /mold
+cmake --build . -j\$(nproc)
+ctest -j\$(nproc)
+cmake --install . --prefix $dest --strip
+find $dest -print | xargs touch --no-dereference --date='$timestamp'
+find $dest -print | sort | tar -cf - --no-recursion --files-from=- | gzip -9nc > /mold/$dest.tar.gz
+chown $(id -u):$(id -g) /mold/$dest.tar.gz
+"

docs/chart.svg

@@ -0,0 +1 @@
+<svg version="1.1" viewBox="0.0 0.0 600.0 371.0" fill="none" stroke="none" stroke-linecap="square" stroke-miterlimit="10" width="600" height="371" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"><path fill="#ffffff" d="M0 0L600.0 0L600.0 371.0L0 371.0L0 0Z" fill-rule="nonzero"/><path stroke="#333333" stroke-width="1.0" stroke-linecap="butt" d="M82.5 275.5L581.5 275.5" fill-rule="nonzero"/><path stroke="#cccccc" stroke-width="1.0" stroke-linecap="butt" d="M82.5 231.5L581.5 231.5" fill-rule="nonzero"/><path stroke="#cccccc" stroke-width="1.0" stroke-linecap="butt" d="M82.5 186.5L581.5 186.5" fill-rule="nonzero"/><path stroke="#cccccc" stroke-width="1.0" stroke-linecap="butt" d="M82.5 142.5L581.5 142.5" fill-rule="nonzero"/><path stroke="#cccccc" stroke-width="1.0" stroke-linecap="butt" d="M82.5 98.5L581.5 98.5" fill-rule="nonzero"/><path stroke="#cccccc" stroke-width="1.0" stroke-linecap="butt" d="M82.5 53.5L581.5 53.5" fill-rule="nonzero"/><clipPath id="id_0"><path d="M82.55 53.916668L581.45 53.916668L581.45 275.45L82.55 275.45L82.55 53.916668Z" clip-rule="nonzero"/></clipPath><path stroke="#000000" stroke-width="2.0" stroke-linecap="butt" stroke-opacity="0.0" clip-path="url(#id_0)" d="M158.0 275.0L136.0 275.0L136.0 229.0C136.0 227.89543 136.89543 227.0 138.0 227.0L156.0 227.0C157.10457 227.0 158.0 227.89543 158.0 229.0Z" fill-rule="nonzero"/><path fill="#4285f4" clip-path="url(#id_0)" d="M158.0 275.0L136.0 275.0L136.0 229.0C136.0 227.89543 136.89543 227.0 138.0 227.0L156.0 227.0C157.10457 227.0 158.0 227.89543 158.0 229.0Z" fill-rule="nonzero"/><path stroke="#000000" stroke-width="2.0" stroke-linecap="butt" stroke-opacity="0.0" clip-path="url(#id_0)" d="M307.0 275.0L285.0 275.0L285.0 91.0C285.0 89.89543 285.89542 89.0 287.0 89.0L305.0 89.0C306.10458 89.0 307.0 89.89543 307.0 91.0Z" fill-rule="nonzero"/><path fill="#4285f4" clip-path="url(#id_0)" d="M307.0 275.0L285.0 275.0L285.0 91.0C285.0 89.89543 285.89542 89.0 287.0 89.0L305.0 89.0C306.10458 89.0 307.0 89.89543 307.0 91.0Z" fill-rule="nonzero"/><path stroke="#000000" stroke-width="2.0" stroke-linecap="butt" stroke-opacity="0.0" clip-path="url(#id_0)" d="M182.0 275.0L160.0 275.0L160.0 244.0C160.0 242.89543 160.89543 242.0 162.0 242.0L180.0 242.0C181.10457 242.0 182.0 242.89543 182.0 244.0Z" fill-rule="nonzero"/><path fill="#ea4335" clip-path="url(#id_0)" d="M182.0 275.0L160.0 275.0L160.0 244.0C160.0 242.89543 160.89543 242.0 162.0 242.0L180.0 242.0C181.10457 242.0 182.0 242.89543 182.0 244.0Z" fill-rule="nonzero"/><path stroke="#000000" stroke-width="2.0" stroke-linecap="butt" stroke-opacity="0.0" clip-path="url(#id_0)" d="M331.0 275.0L309.0 275.0L309.0 131.0C309.0 129.89543 309.89542 129.0 311.0 129.0L329.0 129.0C330.10458 129.0 331.0 129.89543 331.0 131.0Z" fill-rule="nonzero"/><path fill="#ea4335" clip-path="url(#id_0)" d="M331.0 275.0L309.0 275.0L309.0 131.0C309.0 129.89543 309.89542 129.0 311.0 129.0L329.0 129.0C330.10458 129.0 331.0 129.89543 331.0 131.0Z" fill-rule="nonzero"/><path stroke="#000000" stroke-width="2.0" stroke-linecap="butt" stroke-opacity="0.0" clip-path="url(#id_0)" d="M480.0 275.0L458.0 275.0L458.0 156.0C458.0 154.89543 458.89542 154.0 460.0 154.0L478.0 154.0C479.10458 154.0 480.0 154.89543 480.0 156.0Z" fill-rule="nonzero"/><path fill="#ea4335" clip-path="url(#id_0)" d="M480.0 275.0L458.0 275.0L458.0 156.0C458.0 154.89543 458.89542 154.0 460.0 154.0L478.0 154.0C479.10458 154.0 480.0 154.89543 480.0 156.0Z" fill-rule="nonzero"/><path stroke="#000000" stroke-width="2.0" stroke-linecap="butt" stroke-opacity="0.0" clip-path="url(#id_0)" d="M206.0 275.0L184.0 275.0L184.0 270.0C184.0 268.89542 184.89543 268.0 186.0 268.0L204.0 268.0C205.10457 268.0 206.0 268.89542 206.0 270.0Z" fill-rule="nonzero"/><path fill="#fbbc04" clip-path="url(#id_0)" d="M206.0 275.0L184.0 275.0L184.0 270.0C184.0 268.89542 184.89543 268.0 186.0 268.0L204.0 268.0C205.10457 268.0 206.0 268.89542 206.0 270.0Z" fill-rule="nonzero"/><path stroke="#000000" stroke-width="2.0" stroke-linecap="butt" stroke-opacity="0.0" clip-path="url(#id_0)" d="M355.0 275.0L333.0 275.0L333.0 254.0C333.0 252.89543 333.89542 252.0 335.0 252.0L353.0 252.0C354.10458 252.0 355.0 252.89543 355.0 254.0Z" fill-rule="nonzero"/><path fill="#fbbc04" clip-path="url(#id_0)" d="M355.0 275.0L333.0 275.0L333.0 254.0C333.0 252.89543 333.89542 252.0 335.0 252.0L353.0 252.0C354.10458 252.0 355.0 252.89543 355.0 254.0Z" fill-rule="nonzero"/><path stroke="#000000" stroke-width="2.0" stroke-linecap="butt" stroke-opacity="0.0" clip-path="url(#id_0)" d="M504.0 275.0L482.0 275.0L482.0 250.0C482.0 248.89543 482.89542 248.0 484.0 248.0L502.0 248.0C503.10458 248.0 504.0 248.89543 504.0 250.0Z" fill-rule="nonzero"/><path fill="#fbbc04" clip-path="url(#id_0)" d="M504.0 275.0L482.0 275.0L482.0 250.0C482.0 248.89543 482.89542 248.0 484.0 248.0L502.0 248.0C503.10458 248.0 504.0 248.89543 504.0 250.0Z" fill-rule="nonzero"/><path stroke="#000000" stroke-width="2.0" stroke-linecap="butt" stroLine truncated

docs/mold.1

@@ -1,6 +1,6 @@
 .\" generated with Ronn-NG/v0.9.1
 .\" http://github.com/apjanke/ronn-ng/tree/0.9.1
-.TH "MOLD" "1" "July 2023" ""
+.TH "MOLD" "1" "November 2023" ""
 .SH "NAME"
 \fBmold\fR \- a modern linker
 .SH "SYNOPSIS"
@@ -179,6 +179,9 @@ Omit \fB\.symtab\fR section from the output file\.
 \fB\-u\fR \fIsymbol\fR, \fB\-\-undefined\fR=\fIsymbol\fR
 If \fIsymbol\fR remains as an undefined symbol after reading all object files, and if there is a static archive that contains an object file defining \fIsymbol\fR, pull out the object file and link it so that the output file contains a definition of \fIsymbol\fR\.
 .TP
+\fB\-y\fR \fIsymbol\fR, \fB\-\-trace\-symbol\fR=\fIsymbol\fR
+Trace references to \fIsymbol\fR\.
+.TP
 \fB\-\-Bdynamic\fR
 Link against shared libraries\.
 .TP
@@ -354,6 +357,9 @@ Create a share library\.
 \fB\-\-spare\-dynamic\-tags\fR=\fInumber\fR
 Reserve the given \fInumber\fR of tags in \fB\.dynamic\fR section\.
 .TP
+\fB\-\-spare\-program\-headers\fR=\fInumber\fR
+Reserve the given \fInumber\fR of entries in the program header\.
+.TP
 \fB\-\-start\-lib\fR, \fB\-\-end\-lib\fR
 Handle object files between \fB\-\-start\-lib\fR and \fB\-\-end\-lib\fR as if they were in an archive file\. That means object files between them are linked only when they are needed to resolve undefined symbols\. The options are useful if you want to link object files only when they are needed but want to avoid the overhead of running ar(3)\.
 .TP
@@ -475,13 +481,13 @@ Ignored
 .SH "ENVIRONMENT VARIABLES"
 .TP
 \fBMOLD_JOBS\fR
-If this variable is set to \fB1\fR, only one process of \fBmold\fR runs actively\. A mold process invoked while another active mold process is running will wait before doing anything until the active process exits\.
+If this variable is set to \fB1\fR, only one \fBmold\fR process will run at a time\. If a new mold process is initiated while another is already active, the new process will wait until the active one completes before starting\.
 .IP
-The purpose of this environment variable is to reduce peak memory usage\. Since mold is highly parallelized, there's no point in running it simultaneously\. If you run N instances of mold in parallel, it would take N times more time and N times more memory\. If you run them serially, it would still take N times more to finish, but their peak memory usage is reduced to normal\.
+The primary reason for this environment variable is to minimize peak memory usage\. Since mold is designed to operate with high parallelism, running multiple mold instances simultaneously may not be beneficial\. If you execute N instances of mold concurrently, it could require N times the time and N times the memory\. On the other hand, running them one after the other might still take N times longer, but the peak memory usage would be the same as running just a single instance\.
 .IP
-If your build system tends to invoke multiple linker processes simultaneously, you may want to try to set this environment variable to \fB1\fR to see if it could improve overall performance\.
+If your build system invokes multiple linker processes simultaneously and some of them often get killed due to out\-of\-memory errors, you might consider setting this environment variable to \fB1\fR to see if it addresses the OOM issue\.
 .IP
-Currently, any value other than 1 is silently ignored\.
+Currently, any value other than \fB1\fR is silently ignored\.
 .TP
 \fBMOLD_DEBUG\fR
 If this variable is set to a non\-empty string, \fBmold\fR embeds its command\-line options in the output file's \fB\.comment\fR section\.

docs/mold.md

@@ -321,6 +321,9 @@ arguments.
   _symbol_, pull out the object file and link it so that the output file
   contains a definition of _symbol_.
 
+* `-y` _symbol_, `--trace-symbol`=_symbol_:
+  Trace references to _symbol_.
+
 * `--Bdynamic`:
   Link against shared libraries.
 
@@ -581,6 +584,9 @@ arguments.
 * `--spare-dynamic-tags`=_number_:
   Reserve the given _number_ of tags in `.dynamic` section.
 
+* `--spare-program-headers`=_number_:
+  Reserve the given _number_ of entries in the program header.
+
 * `--start-lib`, `--end-lib`:
   Handle object files between `--start-lib` and `--end-lib` as if they were in
   an archive file. That means object files between them are linked only when

elf/arch-arm32.cc

@@ -228,11 +228,24 @@ void write_pltgot_entry(Context<E> &ctx, u8 *buf, Symbol<E> &sym) {
   *(ul32 *)(buf + 12) = sym.get_got_pltgot_addr(ctx) - sym.get_plt_addr(ctx) - 12;
 }
 
-// ARM does not use .eh_frame for exception handling. Instead, it uses
-// .ARM.exidx and .ARM.extab. So this function is empty.
 template <>
 void EhFrameSection<E>::apply_eh_reloc(Context<E> &ctx, const ElfRel<E> &rel,
-                                       u64 offset, u64 val) {}
+                                       u64 offset, u64 val) {
+  u8 *loc = ctx.buf + this->shdr.sh_offset + offset;
+
+  switch (rel.r_type) {
+  case R_NONE:
+    break;
+  case R_ARM_ABS32:
+    *(ul32 *)loc = val;
+    break;
+  case R_ARM_REL32:
+    *(ul32 *)loc = val - this->shdr.sh_addr - offset;
+    break;
+  default:
+    Fatal(ctx) << "unsupported relocation in .eh_frame: " << rel;
+  }
+}
 
 // ARM and Thumb branch instructions can jump within ±16 MiB.
 static bool is_jump_reachable(i64 val) {
@@ -647,7 +660,7 @@ void InputSection<E>::scan_relocations(Context<E> &ctx) {
 }
 
 template <>
-void RangeExtensionThunk<E>::copy_buf(Context<E> &ctx) {
+void Thunk<E>::copy_buf(Context<E> &ctx) {
   // TLS trampoline code. ARM32's TLSDESC is designed so that this
   // common piece of code is factored out from object files to reduce
   // output size. Since no one provide, the linker has to synthesize it.

elf/arch-arm64.cc

@@ -602,7 +602,7 @@ void InputSection<E>::scan_relocations(Context<E> &ctx) {
 }
 
 template <>
-void RangeExtensionThunk<E>::copy_buf(Context<E> &ctx) {
+void Thunk<E>::copy_buf(Context<E> &ctx) {
   static const ul32 insn[] = {
     0x9000'0010, // adrp x16, 0   # R_AARCH64_ADR_PREL_PG_HI21
     0x9100'0210, // add  x16, x16 # R_AARCH64_ADD_ABS_LO12_NC

elf/arch-i386.cc

@@ -254,6 +254,34 @@ static void relax_ld_to_le(u8 *loc, ElfRel<E> rel, u64 val) {
   }
 }
 
+static u32 relax_tlsdesc_to_ie(u8 *loc) {
+  switch ((loc[0] << 8) | loc[1]) {
+  case 0x8d83: return 0x8b83; // lea 0(%ebx), %eax -> mov 0(%ebx), %eax
+  case 0x8d9b: return 0x8b9b; // lea 0(%ebx), %ebx -> mov 0(%ebx), %ebx
+  case 0x8d8b: return 0x8b8b; // lea 0(%ebx), %ecx -> mov 0(%ebx), %ecx
+  case 0x8d93: return 0x8b93; // lea 0(%ebx), %edx -> mov 0(%ebx), %edx
+  case 0x8db3: return 0x8bb3; // lea 0(%ebx), %esi -> mov 0(%ebx), %esi
+  case 0x8dbb: return 0x8bbb; // lea 0(%ebx), %edi -> mov 0(%ebx), %edi
+  case 0x8da3: return 0x8ba3; // lea 0(%ebx), %esp -> mov 0(%ebx), %esp
+  case 0x8dab: return 0x8bab; // lea 0(%ebx), %ebp -> mov 0(%ebx), %ebp
+  }
+  return 0;
+}
+
+static u32 relax_tlsdesc_to_le(u8 *loc) {
+  switch ((loc[0] << 8) | loc[1]) {
+  case 0x8d83: return 0x90b8; // lea 0(%ebx), %eax -> mov $0, %eax
+  case 0x8d9b: return 0x90bb; // lea 0(%ebx), %ebx -> mov $0, %ebx
+  case 0x8d8b: return 0x90b9; // lea 0(%ebx), %ecx -> mov $0, %ecx
+  case 0x8d93: return 0x90ba; // lea 0(%ebx), %edx -> mov $0, %edx
+  case 0x8db3: return 0x90be; // lea 0(%ebx), %esi -> mov $0, %esi
+  case 0x8dbb: return 0x90bf; // lea 0(%ebx), %edi -> mov $0, %edi
+  case 0x8da3: return 0x90bc; // lea 0(%ebx), %esp -> mov $0, %esp
+  case 0x8dab: return 0x90bd; // lea 0(%ebx), %ebp -> mov $0, %ebp
+  }
+  return 0;
+}
+
 template <>
 void InputSection<E>::apply_reloc_alloc(Context<E> &ctx, u8 *base) {
   std::span<const ElfRel<E>> rels = get_rels(ctx);
@@ -373,15 +401,30 @@ void InputSection<E>::apply_reloc_alloc(Context<E> &ctx, u8 *base) {
       //
       //   mov     $foo@TPOFF, %eax
       //   nop
+      //
+      // We allow the following alternative code sequence too because
+      // LLVM emits such code.
+      //
+      //   lea    0(%ebx), %reg
+      //       R_386_TLS_GOTDESC   foo
+      //   mov    %reg, %eax
+      //   call   *(%eax)
+      //       R_386_TLS_DESC_CALL foo
       if (sym.has_tlsdesc(ctx)) {
         *(ul32 *)loc = sym.get_tlsdesc_addr(ctx) + A - GOT;
       } else if (sym.has_gottp(ctx)) {
-        loc[-2] = 0x8b;
-        loc[-1] = 0x83;
+        u32 insn = relax_tlsdesc_to_ie(loc - 2);
+        if (!insn)
+          Fatal(ctx) << *this << ": illegal instruction sequence for TLSDESC";
+        loc[-2] = insn >> 8;
+        loc[-1] = insn;
         *(ul32 *)loc = sym.get_gottp_addr(ctx) + A - GOT;
       } else {
-        loc[-2] = 0x90;
-        loc[-1] = 0xb8;
+        u32 insn = relax_tlsdesc_to_le(loc - 2);
+        if (!insn)
+          Fatal(ctx) << *this << ": illegal instruction sequence for TLSDESC";
+        loc[-2] = insn >> 8;
+        loc[-1] = insn;
         *(ul32 *)loc = S + A - ctx.tp_addr;
       }
       break;

elf/arch-loongarch.cc

@@ -569,11 +569,6 @@ void InputSection<E>::scan_relocations(Context<E> &ctx) {
 
     Symbol<E> &sym = *file.symbols[rel.r_sym];
 
-    if (!sym.file) {
-      record_undef_error(ctx, rel);
-      continue;
-    }
-
     if (sym.is_ifunc())
       sym.flags |= NEEDS_GOT | NEEDS_PLT;
 
@@ -658,7 +653,7 @@ void InputSection<E>::scan_relocations(Context<E> &ctx) {
 }
 
 template <>
-void RangeExtensionThunk<E>::copy_buf(Context<E> &ctx) {
+void Thunk<E>::copy_buf(Context<E> &ctx) {
   static const ul32 insn[] = {
     0x1e00'000c, // pcaddu18i $t0, 0
     0x4c00'0180, // jirl      $zero, $t0, 0

elf/arch-ppc32.cc

@@ -408,7 +408,7 @@ void InputSection<E>::scan_relocations(Context<E> &ctx) {
 }
 
 template <>
-void RangeExtensionThunk<E>::copy_buf(Context<E> &ctx) {
+void Thunk<E>::copy_buf(Context<E> &ctx) {
   static const ub32 local_thunk[] = {
     // Get this thunk's address
     0x7c08'02a6, // mflr    r0

elf/arch-ppc64v1.cc

@@ -262,6 +262,9 @@ void InputSection<E>::apply_reloc_alloc(Context<E> &ctx, u8 *base) {
     case R_PPC64_DTPREL16_LO:
       *(ub16 *)loc = lo(S + A - ctx.dtp_addr);
       break;
+    case R_PPC64_DTPREL16_LO_DS:
+      *(ub16 *)loc |= (S + A - ctx.dtp_addr) & 0xfffc;
+      break;
     case R_PPC64_TPREL16_HA:
       *(ub16 *)loc = ha(S + A - ctx.tp_addr);
       break;
@@ -401,6 +404,7 @@ void InputSection<E>::scan_relocations(Context<E> &ctx) {
     case R_PPC64_TLSLD:
     case R_PPC64_DTPREL16_HA:
     case R_PPC64_DTPREL16_LO:
+    case R_PPC64_DTPREL16_LO_DS:
       break;
     default:
       Error(ctx) << *this << ": unknown relocation: " << rel;
@@ -409,7 +413,7 @@ void InputSection<E>::scan_relocations(Context<E> &ctx) {
 }
 
 template <>
-void RangeExtensionThunk<E>::copy_buf(Context<E> &ctx) {
+void Thunk<E>::copy_buf(Context<E> &ctx) {
   // If the destination is .plt.got, we save the current r2, read an
   // address of a function descriptor from .got, restore %r2 and jump
   // to the function.
@@ -638,15 +642,14 @@ void ppc64v1_scan_symbols(Context<E> &ctx) {
   });
 
   // Functions referenced by the ELF header also have to have .opd entries.
-  auto mark = [&](std::string_view name) {
-    if (!name.empty())
-      if (Symbol<E> &sym = *get_symbol(ctx, name); !sym.is_imported)
-        sym.flags |= NEEDS_PPC_OPD;
-  };
+  if (!ctx.arg.entry->is_imported)
+    ctx.arg.entry->flags |= NEEDS_PPC_OPD;
 
-  mark(ctx.arg.entry);
-  mark(ctx.arg.init);
-  mark(ctx.arg.fini);
+  if (!ctx.arg.init->is_imported)
+    ctx.arg.init->flags |= NEEDS_PPC_OPD;
+
+  if (!ctx.arg.fini->is_imported)
+    ctx.arg.fini->flags |= NEEDS_PPC_OPD;
 }
 
 void PPC64OpdSection::add_symbol(Context<E> &ctx, Symbol<E> *sym) {

elf/arch-ppc64v2.cc

@@ -319,6 +319,9 @@ void InputSection<E>::apply_reloc_alloc(Context<E> &ctx, u8 *base) {
     case R_PPC64_DTPREL16_LO:
       *(ul16 *)loc = lo(S + A - ctx.dtp_addr);
       break;
+    case R_PPC64_DTPREL16_LO_DS:
+      *(ul16 *)loc |= (S + A - ctx.dtp_addr) & 0xfffc;
+      break;
     case R_PPC64_DTPREL34:
       write34(loc, S + A - ctx.dtp_addr);
       break;
@@ -475,6 +478,7 @@ void InputSection<E>::scan_relocations(Context<E> &ctx) {
     case R_PPC64_TLSLD:
     case R_PPC64_DTPREL16_HA:
     case R_PPC64_DTPREL16_LO:
+    case R_PPC64_DTPREL16_LO_DS:
     case R_PPC64_DTPREL34:
       break;
     default:
@@ -484,7 +488,7 @@ void InputSection<E>::scan_relocations(Context<E> &ctx) {
 }
 
 template <>
-void RangeExtensionThunk<E>::copy_buf(Context<E> &ctx) {
+void Thunk<E>::copy_buf(Context<E> &ctx) {
   // If the destination is PLT, we read an address from .got.plt or .got
   // and jump there.
   static const ul32 plt_thunk[] = {
@@ -564,6 +568,106 @@ void RangeExtensionThunk<E>::copy_buf(Context<E> &ctx) {
   }
 }
 
+// GCC may emit references to the following functions in function prologue
+// and epiilogue if -Os is specified. For some reason, these functions are
+// not in libgcc.a and expected to be synthesized by the linker.
+const std::vector<std::pair<std::string_view, u32>>
+ppc64_save_restore_insns = {
+  { "_savegpr0_14", 0xf9c1ff70 }, // std r14,-144(r1)
+  { "_savegpr0_15", 0xf9e1ff78 }, // std r15,-136(r1)
+  { "_savegpr0_16", 0xfa01ff80 }, // std r16,-128(r1)
+  { "_savegpr0_17", 0xfa21ff88 }, // std r17,-120(r1)
+  { "_savegpr0_18", 0xfa41ff90 }, // std r18,-112(r1)
+  { "_savegpr0_19", 0xfa61ff98 }, // std r19,-104(r1)
+  { "_savegpr0_20", 0xfa81ffa0 }, // std r20,-96(r1)
+  { "_savegpr0_21", 0xfaa1ffa8 }, // std r21,-88(r1)
+  { "_savegpr0_22", 0xfac1ffb0 }, // std r22,-80(r1)
+  { "_savegpr0_23", 0xfae1ffb8 }, // std r23,-72(r1)
+  { "_savegpr0_24", 0xfb01ffc0 }, // std r24,-64(r1)
+  { "_savegpr0_25", 0xfb21ffc8 }, // std r25,-56(r1)
+  { "_savegpr0_26", 0xfb41ffd0 }, // std r26,-48(r1)
+  { "_savegpr0_27", 0xfb61ffd8 }, // std r27,-40(r1)
+  { "_savegpr0_28", 0xfb81ffe0 }, // std r28,-32(r1)
+  { "_savegpr0_29", 0xfba1ffe8 }, // std r29,-24(r1)
+  { "_savegpr0_30", 0xfbc1fff0 }, // std r30,-16(r1)
+  { "_savegpr0_31", 0xfbe1fff8 }, // std r31,-8(r1)
+  { "",             0xf8010010 }, // std r0,16(r1)
+  { "",             0x4e800020 }, // blr
+
+  { "_restgpr0_14", 0xe9c1ff70 }, // ld r14,-144(r1)
+  { "_restgpr0_15", 0xe9e1ff78 }, // ld r15,-136(r1)
+  { "_restgpr0_16", 0xea01ff80 }, // ld r16,-128(r1)
+  { "_restgpr0_17", 0xea21ff88 }, // ld r17,-120(r1)
+  { "_restgpr0_18", 0xea41ff90 }, // ld r18,-112(r1)
+  { "_restgpr0_19", 0xea61ff98 }, // ld r19,-104(r1)
+  { "_restgpr0_20", 0xea81ffa0 }, // ld r20,-96(r1)
+  { "_restgpr0_21", 0xeaa1ffa8 }, // ld r21,-88(r1)
+  { "_restgpr0_22", 0xeac1ffb0 }, // ld r22,-80(r1)
+  { "_restgpr0_23", 0xeae1ffb8 }, // ld r23,-72(r1)
+  { "_restgpr0_24", 0xeb01ffc0 }, // ld r24,-64(r1)
+  { "_restgpr0_25", 0xeb21ffc8 }, // ld r25,-56(r1)
+  { "_restgpr0_26", 0xeb41ffd0 }, // ld r26,-48(r1)
+  { "_restgpr0_27", 0xeb61ffd8 }, // ld r27,-40(r1)
+  { "_restgpr0_28", 0xeb81ffe0 }, // ld r28,-32(r1)
+  { "_restgpr0_29", 0xe8010010 }, // ld r0,16(r1)
+  { "",             0xeba1ffe8 }, // ld r29,-24(r1)
+  { "",             0x7c0803a6 }, // mtlr r0
+  { "",             0xebc1fff0 }, // ld r30,-16(r1)
+  { "",             0xebe1fff8 }, // ld r31,-8(r1)
+  { "",             0x4e800020 }, // blr
+  { "_restgpr0_30", 0xebc1fff0 }, // ld r30,-16(r1)
+  { "_restgpr0_31", 0xe8010010 }, // ld r0,16(r1)
+  { "",             0xebe1fff8 }, // ld r31,-8(r1)
+  { "",             0x7c0803a6 }, // mtlr r0
+  { "",             0x4e800020 }, // blr
+
+  { "_savegpr1_14", 0xf9ccff70 }, // std r14,-144(r12)
+  { "_savegpr1_15", 0xf9ecff78 }, // std r15,-136(r12)
+  { "_savegpr1_16", 0xfa0cff80 }, // std r16,-128(r12)
+  { "_savegpr1_17", 0xfa2cff88 }, // std r17,-120(r12)
+  { "_savegpr1_18", 0xfa4cff90 }, // std r18,-112(r12)
+  { "_savegpr1_19", 0xfa6cff98 }, // std r19,-104(r12)
+  { "_savegpr1_20", 0xfa8cffa0 }, // std r20,-96(r12)
+  { "_savegpr1_21", 0xfaacffa8 }, // std r21,-88(r12)
+  { "_savegpr1_22", 0xfaccffb0 }, // std r22,-80(r12)
+  { "_savegpr1_23", 0xfaecffb8 }, // std r23,-72(r12)
+  { "_savegpr1_24", 0xfb0cffc0 }, // std r24,-64(r12)
+  { "_savegpr1_25", 0xfb2cffc8 }, // std r25,-56(r12)
+  { "_savegpr1_26", 0xfb4cffd0 }, // std r26,-48(r12)
+  { "_savegpr1_27", 0xfb6cffd8 }, // std r27,-40(r12)
+  { "_savegpr1_28", 0xfb8cffe0 }, // std r28,-32(r12)
+  { "_savegpr1_29", 0xfbacffe8 }, // std r29,-24(r12)
+  { "_savegpr1_30", 0xfbccfff0 }, // std r30,-16(r12)
+  { "_savegpr1_31", 0xfbecfff8 }, // std r31,-8(r12)
+  { "",             0x4e800020 }, // blr
+
+  { "_restgpr1_14", 0xe9ccff70 }, // ld r14,-144(r12)
+  { "_restgpr1_15", 0xe9ecff78 }, // ld r15,-136(r12)
+  { "_restgpr1_16", 0xea0cff80 }, // ld r16,-128(r12)
+  { "_restgpr1_17", 0xea2cff88 }, // ld r17,-120(r12)
+  { "_restgpr1_18", 0xea4cff90 }, // ld r18,-112(r12)
+  { "_restgpr1_19", 0xea6cff98 }, // ld r19,-104(r12)
+  { "_restgpr1_20", 0xea8cffa0 }, // ld r20,-96(r12)
+  { "_restgpr1_21", 0xeaacffa8 }, // ld r21,-88(r12)
+  { "_restgpr1_22", 0xeaccffb0 }, // ld r22,-80(r12)
+  { "_restgpr1_23", 0xeaecffb8 }, // ld r23,-72(r12)
+  { "_restgpr1_24", 0xeb0cffc0 }, // ld r24,-64(r12)
+  { "_restgpr1_25", 0xeb2cffc8 }, // ld r25,-56(r12)
+  { "_restgpr1_26", 0xeb4cffd0 }, // ld r26,-48(r12)
+  { "_restgpr1_27", 0xeb6cffd8 }, // ld r27,-40(r12)
+  { "_restgpr1_28", 0xeb8cffe0 }, // ld r28,-32(r12)
+  { "_restgpr1_29", 0xebacffe8 }, // ld r29,-24(r12)
+  { "_restgpr1_30", 0xebccfff0 }, // ld r30,-16(r12)
+  { "_restgpr1_31", 0xebecfff8 }, // ld r31,-8(r12)
+  { "",             0x4e800020 }, // blr
+};
+
+void PPC64SaveRestoreSection::copy_buf(Context<E> &ctx) {
+  ul32 *buf = (ul32 *)(ctx.buf + this->shdr.sh_offset);
+  for (auto [label, insn] : ppc64_save_restore_insns)
+    *buf++ = insn;
+}
+
 template <>
 u64 get_eflags(Context<E> &ctx) {
   return 2;

elf/arch-riscv.cc

@@ -363,9 +363,55 @@ void InputSection<E>::apply_reloc_alloc(Context<E> &ctx, u8 *base) {
       }
       break;
     }
-    case R_RISCV_GOT_HI20:
-      write_utype(loc, G + GOT + A - P);
+    case R_RISCV_GOT_HI20: {
+      // This relocation usually refers to an AUIPC + LD instruction
+      // pair to load a symbol value from the GOT. If the symbol value
+      // is actually a link-time constant, we can materialize the value
+      // directly into a register to eliminate a memory load.
+      i64 rd = get_rd(rel.r_offset);
+
+      switch (removed_bytes) {
+      case 6:
+        // c.li <rd>, val
+        *(ul16 *)loc = 0b010'0'00000'00000'01 | (rd << 7);
+        write_citype(loc, sym.get_addr(ctx));
+        i += 3;
+        break;
+      case 4:
+        // addi <rd>, zero, val
+        *(ul32 *)loc = 0b0010011 | (rd << 7);
+        write_itype(loc, sym.get_addr(ctx));
+        i += 3;
+        break;
+      case 0:
+        if (ctx.arg.relax &&
+            sym.is_pcrel_linktime_const(ctx) &&
+            i + 3 < rels.size() &&
+            rels[i + 1].r_type == R_RISCV_RELAX &&
+            rels[i + 2].r_type == R_RISCV_PCREL_LO12_I &&
+            rels[i + 2].r_offset == rels[i].r_offset + 4 &&
+            file.symbols[rels[i + 2].r_sym]->value == r_offset &&
+            rels[i + 3].r_type == R_RISCV_RELAX) {
+          i64 val = S + A - P;
+          if (rd == get_rd(rel.r_offset + 4) && (i32)val == val) {
+            // auipc <rd>, %hi20(val)
+            write_utype(loc, val);
+
+            // addi <rd>, <rd>, %lo12(val)
+            *(ul32 *)(loc + 4) = 0b0010011 | (rd << 15) | (rd << 7);
+            write_itype(loc + 4, val);
+            i += 3;
+            break;
+          }
+        }
+
+        write_utype(loc, G + GOT + A - P);
+        break;
+      default:
+        unreachable();
+      }
       break;
+    }
     case R_RISCV_TLS_GOT_HI20:
       write_utype(loc, sym.get_gottp_addr(ctx) + A - P);
       break;
@@ -466,12 +512,49 @@ void InputSection<E>::apply_reloc_alloc(Context<E> &ctx, u8 *base) {
       break;
     }
     case R_RISCV_TLSDESC_HI20:
+      // RISC-V TLSDESC uses the following code sequence to materialize
+      // a TP-relative address in x0.
+      //
+      //   .L0:
+      //   auipc  tX, 0
+      //       R_RISCV_TLSDESC_HI20         foo
+      //   l[d|w] tY, tX, 0
+      //       R_RISCV_TLSDESC_LOAD_LO12_I  .L0
+      //   addi   a0, tX, 0
+      //       R_RISCV_TLSDESC_ADD_LO12_I   .L0
+      //   jalr   t0, tY
+      //       R_RISCV_TLSDESC_CALL         .L0
+      //
+      // For non-dlopen'd DSO, we may relax the instructions to the following:
+      //
+      //   <deleted>
+      //   <deleted>
+      //   auipc  a0, %gottp_hi(a0)
+      //   l[d|w] a0, %gottp_lo(a0)
+      //
+      // For executable, if the TP offset is small enough, we'll relax
+      // it to the following:
+      //
+      //   <deleted>
+      //   <deleted>
+      //   <deleted>
+      //   addi   a0, zero, %tpoff_lo(a0)
+      //
+      // Otherwise, the following sequence is used:
+      //
+      //   <deleted>
+      //   <deleted>
+      //   lui    a0, %tpoff_hi(a0)
+      //   addi   a0, a0, %tpoff_lo(a0)
       if (removed_bytes == 0)
         write_utype(loc, sym.get_tlsdesc_addr(ctx) + A - P);
       break;
     case R_RISCV_TLSDESC_LOAD_LO12:
     case R_RISCV_TLSDESC_ADD_LO12:
     case R_RISCV_TLSDESC_CALL: {
+      if (removed_bytes == 4)
+        break;
+
       i64 idx2 = find_paired_reloc();
       const ElfRel<E> &rel2 = rels[idx2];
       Symbol<E> &sym2 = *file.symbols[rel2.r_sym];
@@ -482,27 +565,24 @@ void InputSection<E>::apply_reloc_alloc(Context<E> &ctx, u8 *base) {
 
       switch (rel.r_type) {
       case R_RISCV_TLSDESC_LOAD_LO12:
-        if (sym2.has_tlsdesc(ctx))
-          write_itype(loc, sym2.get_tlsdesc_addr(ctx) + A - P);
+        write_itype(loc, sym2.get_tlsdesc_addr(ctx) + A - P);
         break;
       case R_RISCV_TLSDESC_ADD_LO12:
         if (sym2.has_tlsdesc(ctx)) {
           write_itype(loc, sym2.get_tlsdesc_addr(ctx) + A - P);
         } else if (sym2.has_gottp(ctx)) {
-          *(ul32 *)loc = 0x517;   // auipc a0,<hi20>
+          *(ul32 *)loc = 0x517; // auipc a0,<hi20>
           write_utype(loc, sym2.get_gottp_addr(ctx) + A - P);
         } else {
-          if (removed_bytes == 0) {
-            *(ul32 *)loc = 0x537; // lui a0,<hi20>
-            write_utype(loc, S + A - ctx.tp_addr);
-          }
+          *(ul32 *)loc = 0x537; // lui a0,<hi20>
+          write_utype(loc, S + A - ctx.tp_addr);
         }
         break;
       case R_RISCV_TLSDESC_CALL:
         if (sym2.has_tlsdesc(ctx)) {
           // Do nothing
         } else if (sym2.has_gottp(ctx)) {
-          // {ld,lw} a0, <lo12>(a0)
+          // l[d|w] a0,<lo12>
           *(ul32 *)loc = E::is_64 ? 0x53503 : 0x52503;
           write_itype(loc, sym2.get_gottp_addr(ctx) + A - P);
         } else {
@@ -949,6 +1029,34 @@ static void shrink_section(Context<E> &ctx, InputSection<E> &isec, bool use_rvc)
       }
       break;
     }
+    case R_RISCV_GOT_HI20: {
+      // A GOT_HI20 followed by a PCREL_LO12_I is used to load a value from
+      // GOT. If the loaded value is a link-time constant, we can rewrite
+      // the instructions to directly materialize the value, eliminating a
+      // memory load.
+      if (sym.is_absolute() &&
+          i + 3 < rels.size() &&
+          rels[i + 1].r_type == R_RISCV_RELAX &&
+          rels[i + 2].r_type == R_RISCV_PCREL_LO12_I &&
+          rels[i + 2].r_offset == rels[i].r_offset + 4 &&
+          isec.file.symbols[rels[i + 2].r_sym]->value == rels[i].r_offset &&
+          rels[i + 3].r_type == R_RISCV_RELAX) {
+        i64 rd = get_rd(r.r_offset);
+
+        if (rd == get_rd(r.r_offset + 4)) {
+          u64 val = sym.get_addr(ctx) + r.r_addend;
+
+          if (use_rvc && rd != 0 && sign_extend(val, 5) == val) {
+            // Replace AUIPC + LD with C.LI.
+            delta += 6;
+          } else if (sign_extend(val, 11) == val) {
+            // Replace AUIPC + LD with ADDI.
+            delta += 4;
+          }
+        }
+      }
+      break;
+    }
     case R_RISCV_HI20: {
       u64 val = sym.get_addr(ctx) + r.r_addend;
       i64 rd = get_rd(r.r_offset);

elf/arch-x86-64.cc

@@ -178,6 +178,50 @@ static u32 relax_gottpoff(u8 *loc) {
   return 0;
 }
 
+static u32 relax_tlsdesc_to_ie(u8 *loc) {
+  switch ((loc[0] << 16) | (loc[1] << 8) | loc[2]) {
+  case 0x488d05: return 0x488b05; // lea 0(%rip), %rax -> mov 0(%rip), %rax
+  case 0x488d0d: return 0x488b0d; // lea 0(%rip), %rcx -> mov 0(%rip), %rcx
+  case 0x488d15: return 0x488b15; // lea 0(%rip), %rdx -> mov 0(%rip), %rdx
+  case 0x488d1d: return 0x488b1d; // lea 0(%rip), %rbx -> mov 0(%rip), %rbx
+  case 0x488d25: return 0x488b25; // lea 0(%rip), %rsp -> mov 0(%rip), %rsp
+  case 0x488d2d: return 0x488b2d; // lea 0(%rip), %rbp -> mov 0(%rip), %rbp
+  case 0x488d35: return 0x488b35; // lea 0(%rip), %rsi -> mov 0(%rip), %rsi
+  case 0x488d3d: return 0x488b3d; // lea 0(%rip), %rdi -> mov 0(%rip), %rdi
+  case 0x4c8d05: return 0x4c8b05; // lea 0(%rip), %r8  -> mov 0(%rip), %r8
+  case 0x4c8d0d: return 0x4c8b0d; // lea 0(%rip), %r9  -> mov 0(%rip), %r9
+  case 0x4c8d15: return 0x4c8b15; // lea 0(%rip), %r10 -> mov 0(%rip), %r10
+  case 0x4c8d1d: return 0x4c8b1d; // lea 0(%rip), %r11 -> mov 0(%rip), %r11
+  case 0x4c8d25: return 0x4c8b25; // lea 0(%rip), %r12 -> mov 0(%rip), %r12
+  case 0x4c8d2d: return 0x4c8b2d; // lea 0(%rip), %r13 -> mov 0(%rip), %r13
+  case 0x4c8d35: return 0x4c8b35; // lea 0(%rip), %r14 -> mov 0(%rip), %r14
+  case 0x4c8d3d: return 0x4c8b3d; // lea 0(%rip), %r15 -> mov 0(%rip), %r15
+  }
+  return 0;
+}
+
+static u32 relax_tlsdesc_to_le(u8 *loc) {
+  switch ((loc[0] << 16) | (loc[1] << 8) | loc[2]) {
+  case 0x488d05: return 0x48c7c0; // lea 0(%rip), %rax -> mov $0, %rax
+  case 0x488d0d: return 0x48c7c1; // lea 0(%rip), %rcx -> mov $0, %rcx
+  case 0x488d15: return 0x48c7c2; // lea 0(%rip), %rdx -> mov $0, %rdx
+  case 0x488d1d: return 0x48c7c3; // lea 0(%rip), %rbx -> mov $0, %rbx
+  case 0x488d25: return 0x48c7c4; // lea 0(%rip), %rsp -> mov $0, %rsp
+  case 0x488d2d: return 0x48c7c5; // lea 0(%rip), %rbp -> mov $0, %rbp
+  case 0x488d35: return 0x48c7c6; // lea 0(%rip), %rsi -> mov $0, %rsi
+  case 0x488d3d: return 0x48c7c7; // lea 0(%rip), %rdi -> mov $0, %rdi
+  case 0x4c8d05: return 0x49c7c0; // lea 0(%rip), %r8  -> mov $0, %r8
+  case 0x4c8d0d: return 0x49c7c1; // lea 0(%rip), %r9  -> mov $0, %r9
+  case 0x4c8d15: return 0x49c7c2; // lea 0(%rip), %r10 -> mov $0, %r10
+  case 0x4c8d1d: return 0x49c7c3; // lea 0(%rip), %r11 -> mov $0, %r11
+  case 0x4c8d25: return 0x49c7c4; // lea 0(%rip), %r12 -> mov $0, %r12
+  case 0x4c8d2d: return 0x49c7c5; // lea 0(%rip), %r13 -> mov $0, %r13
+  case 0x4c8d35: return 0x49c7c6; // lea 0(%rip), %r14 -> mov $0, %r14
+  case 0x4c8d3d: return 0x49c7c7; // lea 0(%rip), %r15 -> mov $0, %r15
+  }
+  return 0;
+}
+
 // Rewrite a function call to __tls_get_addr to a cheaper instruction
 // sequence. We can do this when we know the thread-local variable's TP-
 // relative address at link-time.
@@ -501,19 +545,32 @@ void InputSection<E>::apply_reloc_alloc(Context<E> &ctx, u8 *base) {
       //
       //   mov     $foo@TPOFF, %rax
       //   nop
+      //
+      // We allow the following alternative code sequence too because
+      // LLVM emits such code.
+      //
+      //   lea    0(%rip), %reg
+      //       R_X86_64_GOTPC32_TLSDESC    foo
+      //   mov    %reg, %rax
+      //   call   *(%rax)
+      //       R_X86_64_TLSDESC_CALL       foo
       if (sym.has_tlsdesc(ctx)) {
         write32s(sym.get_tlsdesc_addr(ctx) + A - P);
       } else if (sym.has_gottp(ctx)) {
-        // mov foo@gottpoff(%rip), %rax
-        loc[-3] = 0x48;
-        loc[-2] = 0x8b;
-        loc[-1] = 0x05;
+        u32 insn = relax_tlsdesc_to_ie(loc - 3);
+        if (!insn)
+          Fatal(ctx) << *this << ": illegal instruction sequence for TLSDESC";
+        loc[-3] = insn >> 16;
+        loc[-2] = insn >> 8;
+        loc[-1] = insn;
         write32s(sym.get_gottp_addr(ctx) + A - P);
       } else {
-        // mov $foo@tpoff, %rax
-        loc[-3] = 0x48;
-        loc[-2] = 0xc7;
-        loc[-1] = 0xc0;
+        u32 insn = relax_tlsdesc_to_le(loc - 3);
+        if (!insn)
+          Fatal(ctx) << *this << ": illegal instruction sequence for TLSDESC";
+        loc[-3] = insn >> 16;
+        loc[-2] = insn >> 8;
+        loc[-1] = insn;
         write32s(S - ctx.tp_addr);
       }
       break;

elf/cmdline.cc

@@ -9,7 +9,7 @@
 #include <unordered_set>
 
 #ifdef _WIN32
-# define _isatty isatty
+# define isatty _isatty
 # define STDERR_FILENO (_fileno(stderr))
 #else
 # include <unistd.h>
@@ -34,7 +34,7 @@ Options:
     --no-dynamic-linker
   -L DIR, --library-path DIR  Add DIR to library search path
   -M, --print-map             Write map file to stdout
-  -N, --omagic                Do not page align data, do not make text readonly
+  -N, --omagic                Do not page align data; do not make text readonly
     --no-omagic
   -O NUMBER                   Ignored
   -S, --strip-debug           Strip .debug_* sections
@@ -52,6 +52,8 @@ Options:
   -s, --strip-all             Strip .symtab section
   -u SYMBOL, --undefined SYMBOL
                               Force to resolve SYMBOL
+  -y SYMBOL, --trace-symbol SYMBOL
+                              Trace references to SYMBOL
   --Bdynamic, --dy            Link against shared libraries (default)
   --Bstatic, --dn, --static   Do not link against shared libraries
   --Bsymbolic                 Bind global symbols locally
@@ -59,17 +61,17 @@ Options:
   --Bno-symbolic              Cancel --Bsymbolic and --Bsymbolic-functions
   --Map FILE                  Write map file to a given file
   --Tbss=ADDR                 Set address to .bss
-  --Tdata                     Set address to .data
-  --Ttext                     Set address to .text
+  --Tdata=ADDR                Set address to .data
+  --Ttext=ADDR                Set address to .text
   --allow-multiple-definition Allow multiple definitions
-  --apply-dynamic-relocs      Apply link-time values for dynamic relocations (defualt)
+  --apply-dynamic-relocs      Apply link-time values for dynamic relocations (default)
     --no-apply-dynamic-relocs
   --as-needed                 Only set DT_NEEDED if used
     --no-as-needed
   --build-id [none,md5,sha1,sha256,uuid,HEXSTRING]
                               Generate build ID
     --no-build-id
-  --chroot DIR                Set a given path to root directory
+  --chroot DIR                Set a given path to the root directory
   --color-diagnostics=[auto,always,never]
                               Use colors in diagnostics
   --color-diagnostics         Alias for --color-diagnostics=always
@@ -84,12 +86,12 @@ Options:
     --disable-new-dtags       Emit DT_RPATH for --rpath
   --execute-only              Make executable segments unreadable
   --dp                        Ignored
-  --dynamic-list              Read a list of dynamic symbols (implies -Bsymbolic)
+  --dynamic-list=FILE         Read a list of dynamic symbols (implies -Bsymbolic)
   --eh-frame-hdr              Create .eh_frame_hdr section
     --no-eh-frame-hdr
-  --exclude-libs LIB,LIB,..   Mark all symbols in given libraries hidden
+  --exclude-libs LIB,LIB,..   Mark all symbols in given libraries as hidden
   --export-dynamic-symbol     Put symbols matching glob in the dynamic symbol table
-  --export-dynamic-symbol-list
+  --export-dynamic-symbol-list=FILE
                               Read a list of dynamic symbols
   --fatal-warnings            Treat warnings as errors
     --no-fatal-warnings       Do not treat warnings as errors (default)
@@ -107,54 +109,58 @@ Options:
                               Allow merging non-executable sections with --icf
   --image-base ADDR           Set the base address to a given value
   --init SYMBOL               Call SYMBOL at load-time
+  --nmagic                    Do not page align sections
+    --no-nmagic
   --no-undefined              Report undefined symbols (even with --shared)
   --noinhibit-exec            Create an output file even if errors occur
-  --oformat=binary            Omit ELF, section and program headers
+  --oformat=binary            Omit ELF, section, and program headers
   --pack-dyn-relocs=[relr,none]
                               Pack dynamic relocations
   --package-metadata=STRING   Set a given string to .note.package
   --perf                      Print performance statistics
-  --pie, --pic-executable     Create a position independent executable
+  --pie, --pic-executable     Create a position-independent executable
     --no-pie, --no-pic-executable
-  --pop-state                 Restore state of flags governing input file handling
+  --pop-state                 Restore the state of flags governing input file handling
   --print-gc-sections         Print removed unreferenced sections
     --no-print-gc-sections
   --print-icf-sections        Print folded identical sections
     --no-print-icf-sections
-  --push-state                Save state of flags governing input file handling
+  --push-state                Save the state of flags governing input file handling
   --quick-exit                Use quick_exit to exit (default)
     --no-quick-exit
   --relax                     Optimize instructions (default)
     --no-relax
-  --repro                     Embed input files to .repro section
+  --repro                     Embed input files in .repro section
   --require-defined SYMBOL    Require SYMBOL be defined in the final output
   --retain-symbols-file FILE  Keep only symbols listed in FILE
-  --reverse-sections          Reverses input sections in the output file
+  --reverse-sections          Reverse input sections in the output file
   --rosegment                 Put read-only non-executable sections in their own segment (default)
     --no-rosegment            Put read-only non-executable sections in an executable segment
-  --rpath DIR                 Add DIR to runtime search path
+  --rpath DIR                 Add DIR to the runtime search path
   --rpath-link DIR            Ignored
   --run COMMAND ARG...        Run COMMAND with mold as /usr/bin/ld
-  --section-start=SECTION=ADDR Set address to section
-  --shared, --Bshareable      Create a share library
+  --section-start=SECTION=ADDR Set address for section
+  --shared, --Bshareable      Create a shared library
   --shuffle-sections[=SEED]   Randomize the output by shuffling input sections
   --sort-common               Ignored
   --sort-section              Ignored
-  --spare-dynamic-tags NUMBER Reserve give number of tags in .dynamic section
+  --spare-dynamic-tags NUMBER Reserve the given number of tags in the .dynamic section
+  --spare-program-headers NUMBER
+                              Reserve the given number of slots in the program header
   --start-lib                 Give following object files in-archive-file semantics
     --end-lib                 End the effect of --start-lib
   --stats                     Print input statistics
-  --sysroot DIR               Set target system root directory
+  --sysroot DIR               Set the target system root directory
   --thread-count COUNT, --threads=COUNT
                               Use COUNT number of threads
   --threads                   Use multiple threads (default)
     --no-threads
-  --trace                     Print name of each input file
-  --undefined-version         Do not report version scripts that refer undefined symbols
-    --no-undefined-version    Report version scripts that refer undefined symbols (default)
+  --trace                     Print the name of each input file
+  --undefined-version         Do not report version scripts that refer to undefined symbols
+    --no-undefined-version    Report version scripts that refer to undefined symbols (default)
   --unique PATTERN            Don't merge input sections that match a given pattern
   --unresolved-symbols [report-all,ignore-all,ignore-in-object-files,ignore-in-shared-libs]
-                              How to handle unresolved symbols
+                              Handle unresolved symbols
   --version-script FILE       Read version script
   --warn-common               Warn about common symbols
     --no-warn-common
@@ -166,21 +172,21 @@ Options:
                               Report unresolved symbols as errors (default)
   --whole-archive             Include all objects from static archives
     --no-whole-archive
-  --wrap SYMBOL               Use wrapper function for a given symbol
+  --wrap SYMBOL               Use a wrapper function for a given symbol
   -z defs                     Report undefined symbols (even with --shared)
     -z nodefs
   -z common-page-size=VALUE   Ignored
-  -z execstack                Require executable stack
+  -z execstack                Require an executable stack
     -z noexecstack
-  -z execstack-if-needed      Make the stack area execuable if an input file explicitly requests it
+  -z execstack-if-needed      Make the stack area executable if an input file explicitly requests it
   -z initfirst                Mark DSO to be initialized first at runtime
-  -z interpose                Mark object to interpose all DSOs but executable
+  -z interpose                Mark object to interpose all DSOs but the executable
   -z keep-text-section-prefix Keep .text.{hot,unknown,unlikely,startup,exit} as separate sections in the final binary
     -z nokeep-text-section-prefix
   -z lazy                     Enable lazy function resolution (default)
   -z max-page-size=VALUE      Use VALUE as the memory page size
   -z nocopyreloc              Do not create copy relocations
-  -z nodefaultlib             Make the dynamic loader to ignore default search paths
+  -z nodefaultlib             Make the dynamic loader ignore default search paths
   -z nodelete                 Mark DSO non-deletable at runtime
   -z nodlopen                 Mark DSO not available to dlopen
   -z nodump                   Mark DSO not available to dldump
@@ -191,10 +197,10 @@ Options:
   -z sectionheader            Do not omit section header (default)
     -z nosectionheader        Omit section header
   -z separate-loadable-segments
-                              Separate all loadable segments to different pages
-    -z separate-code          Separate code and data into different pages
+                              Separate all loadable segments onto different pages
+    -z separate-code          Separate code and data onto different pages
     -z noseparate-code        Allow overlap in pages
-  -z stack-size=VALUE         Set size of stack segment
+  -z stack-size=VALUE         Set the size of the stack segment
   -z relro                    Make some sections read-only after relocation (default)
     -z norelro
   -z text                     Report error if DT_TEXTREL is set
@@ -431,7 +437,7 @@ std::vector<std::string> parse_nonpositional_args(Context<E> &ctx) {
     ctx.arg.apply_dynamic_relocs = false;
 
   auto read_arg = [&](std::string name) {
-    for (std::string opt : add_dashes(name)) {
+    for (const std::string &opt : add_dashes(name)) {
       if (args[0] == opt) {
         if (args.size() == 1)
           Fatal(ctx) << "option -" << name << ": argument missing";
@@ -451,7 +457,7 @@ std::vector<std::string> parse_nonpositional_args(Context<E> &ctx) {
   };
 
   auto read_eq = [&](std::string name) {
-    for (std::string opt : add_dashes(name)) {
+    for (const std::string &opt : add_dashes(name)) {
       if (args[0].starts_with(opt + "=")) {
         arg = args[0].substr(opt.size() + 1);
         args = args.subspan(1);
@@ -462,7 +468,7 @@ std::vector<std::string> parse_nonpositional_args(Context<E> &ctx) {
   };
 
   auto read_flag = [&](std::string name) {
-    for (std::string opt : add_dashes(name)) {
+    for (const std::string &opt : add_dashes(name)) {
       if (args[0] == opt) {
         args = args.subspan(1);
         return true;
@@ -586,7 +592,7 @@ std::vector<std::string> parse_nonpositional_args(Context<E> &ctx) {
       ctx.arg.emit_relocs = true;
       ctx.arg.discard_locals = false;
     } else if (read_arg("e") || read_arg("entry")) {
-      ctx.arg.entry = arg;
+      ctx.arg.entry = get_symbol(ctx, arg);
     } else if (read_arg("Map")) {
       ctx.arg.Map = arg;
       ctx.arg.print_map = true;
@@ -604,6 +610,9 @@ std::vector<std::string> parse_nonpositional_args(Context<E> &ctx) {
       ctx.arg.shared = true;
     } else if (read_arg("spare-dynamic-tags")) {
       ctx.arg.spare_dynamic_tags = parse_number(ctx, "spare-dynamic-tags", arg);
+    } else if (read_arg("spare-program-headers")) {
+      ctx.arg.spare_program_headers
+        = parse_number(ctx, "spare-program-headers", arg);
     } else if (read_flag("start-lib")) {
       remaining.push_back("--start-lib");
     } else if (read_flag("start-stop")) {
@@ -660,13 +669,13 @@ std::vector<std::string> parse_nonpositional_args(Context<E> &ctx) {
       else
         Fatal(ctx) << "unknown --unresolved-symbols argument: " << arg;
     } else if (read_arg("undefined") || read_arg("u")) {
-      ctx.arg.undefined.push_back(arg);
+      ctx.arg.undefined.push_back(get_symbol(ctx, arg));
     } else if (read_arg("require-defined")) {
-      ctx.arg.require_defined.push_back(arg);
+      ctx.arg.require_defined.push_back(get_symbol(ctx, arg));
     } else if (read_arg("init")) {
-      ctx.arg.init = arg;
+      ctx.arg.init = get_symbol(ctx, arg);
     } else if (read_arg("fini")) {
-      ctx.arg.fini = arg;
+      ctx.arg.fini = get_symbol(ctx, arg);
     } else if (read_arg("hash-style")) {
       if (arg == "sysv") {
         ctx.arg.hash_style_sysv = true;
@@ -887,6 +896,10 @@ std::vector<std::string> parse_nonpositional_args(Context<E> &ctx) {
       ctx.arg.z_rewrite_endbr = true;
     } else if (read_flag("no-undefined")) {
       ctx.arg.z_defs = true;
+    } else if (read_flag("nmagic")) {
+      ctx.arg.nmagic = true;
+    } else if (read_flag("no-nmagic")) {
+      ctx.arg.nmagic = false;
     } else if (read_flag("fatal-warnings")) {
       ctx.arg.fatal_warnings = true;
     } else if (read_flag("no-fatal-warnings")) {
@@ -1104,21 +1117,21 @@ std::vector<std::string> parse_nonpositional_args(Context<E> &ctx) {
     } else if (read_flag("no-keep-memory")) {
     } else if (read_arg("max-cache-size")) {
     } else if (read_arg("version-script")) {
-      // --version-script, --dynamic-list and --export-dynamic-symbol[-list]
-      // are treated as positional arguments even though they are actually not
-      // positional. This is because linker scripts (a positional argument)
-      // can also specify a version script, and it's better to consolidate
-      // parsing in read_input_files. In particular, version scripts can
-      // modify ctx.default_version which we initialize *after* parsing
-      // non-positional args, so the parsing cannot be done right here.
+      // --version-script is treated as positional arguments even though
+      // they are actually not positional. This is because linker scripts
+      // (a positional argument) can also specify a version script, and
+      // it's better to consolidate parsing in read_input_files. In
+      // particular, version scripts can modify ctx.default_version which
+      // we initialize *after* parsing non-positional args, so the parsing
+      // cannot be done right here.
       remaining.push_back("--version-script=" + std::string(arg));
     } else if (read_arg("dynamic-list")) {
       ctx.arg.Bsymbolic = true;
-      remaining.push_back("--dynamic-list=" + std::string(arg));
+      append(ctx.dynamic_list_patterns, parse_dynamic_list(ctx, arg));
     } else if (read_arg("export-dynamic-symbol")) {
-      remaining.push_back("--export-dynamic-symbol=" + std::string(arg));
+      ctx.dynamic_list_patterns.push_back({arg, "<command line>"});
     } else if (read_arg("export-dynamic-symbol-list")) {
-      remaining.push_back("--export-dynamic-symbol-list=" + std::string(arg));
+      append(ctx.dynamic_list_patterns, parse_dynamic_list(ctx, arg));
     } else if (read_flag("as-needed")) {
       remaining.push_back("--as-needed");
     } else if (read_flag("no-as-needed")) {
@@ -1200,6 +1213,9 @@ std::vector<std::string> parse_nonpositional_args(Context<E> &ctx) {
   else if (!ctx.arg.section_order.empty())
     ctx.arg.z_relro = false;
 
+  if (ctx.arg.nmagic)
+    ctx.arg.z_relro = false;
+
   if (!ctx.arg.shared) {
     if (!ctx.arg.filter.empty())
       Fatal(ctx) << "-filter may not be used without -shared";
@@ -1228,11 +1244,6 @@ std::vector<std::string> parse_nonpositional_args(Context<E> &ctx) {
   if (char *env = getenv("MOLD_REPRO"); env && env[0])
     ctx.arg.repro = true;
 
-  if (ctx.arg.shared || ctx.arg.export_dynamic)
-    ctx.default_version = VER_NDX_GLOBAL;
-  else
-    ctx.default_version = VER_NDX_LOCAL;
-
   if (ctx.arg.default_symver) {
     std::string ver = ctx.arg.soname.empty() ?
       filepath(ctx.arg.output).filename().string() : std::string(ctx.arg.soname);
@@ -1245,6 +1256,12 @@ std::vector<std::string> parse_nonpositional_args(Context<E> &ctx) {
 
   ctx.arg.undefined.push_back(ctx.arg.entry);
 
+  for (i64 i = 0; i < ctx.arg.defsyms.size(); i++) {
+    std::variant<Symbol<E> *, u64> &val = ctx.arg.defsyms[i].second;
+    if (Symbol<E> **sym = std::get_if<Symbol<E> *>(&val))
+      ctx.arg.undefined.push_back(*sym);
+  }
+
   // --oformat=binary implies --strip-all because without a section
   // header, there's no way to identify the locations of a symbol
   // table in an output file in the first place.

elf/elf.h

@@ -161,6 +161,7 @@ enum : u32 {
   VER_NDX_LOCAL = 0,
   VER_NDX_GLOBAL = 1,
   VER_NDX_LAST_RESERVED = 1,
+  VER_NDX_UNSPECIFIED = 0xffff,
 };
 
 enum : u32 {
@@ -1739,7 +1740,7 @@ struct ElfSym<ARM64> {
   u8 st_bind : 4;
   u8 st_type : 4;
   u8 arm64_variant_pcs : 1;
-  u8 : 6;
+  u8 : 5;
   u8 st_visibility : 2;
 #endif
 
@@ -1868,7 +1869,7 @@ struct X86_64 {
   static constexpr u32 plt_hdr_size = 32;
   static constexpr u32 plt_size = 16;
   static constexpr u32 pltgot_size = 8;
-  static constexpr u8 filler[] = { 0xcc };
+  static constexpr u8 filler[] = { 0xcc }; // int3
 
   static constexpr u32 R_COPY = R_X86_64_COPY;
   static constexpr u32 R_GLOB_DAT = R_X86_64_GLOB_DAT;
@@ -1893,7 +1894,7 @@ struct I386 {
   static constexpr u32 plt_hdr_size = 16;
   static constexpr u32 plt_size = 16;
   static constexpr u32 pltgot_size = 16;
-  static constexpr u8 filler[] = { 0xcc };
+  static constexpr u8 filler[] = { 0xcc }; // int3
 
   static constexpr u32 R_COPY = R_386_COPY;
   static constexpr u32 R_GLOB_DAT = R_386_GLOB_DAT;
@@ -1920,7 +1921,7 @@ struct ARM64 {
   static constexpr u32 pltgot_size = 16;
   static constexpr u32 thunk_hdr_size = 0;
   static constexpr u32 thunk_size = 16;
-  static constexpr u8 filler[] = { 0x00, 0x7d, 0x20, 0xd4 };
+  static constexpr u8 filler[] = { 0x00, 0x7d, 0x20, 0xd4 }; // brk
 
   static constexpr u32 R_COPY = R_AARCH64_COPY;
   static constexpr u32 R_GLOB_DAT = R_AARCH64_GLOB_DAT;
@@ -1947,7 +1948,7 @@ struct ARM32 {
   static constexpr u32 pltgot_size = 16;
   static constexpr u32 thunk_hdr_size = 16;
   static constexpr u32 thunk_size = 16;
-  static constexpr u8 filler[] = { 0xff, 0xde };
+  static constexpr u8 filler[] = { 0xff, 0xde }; // udf
 
   static constexpr u32 R_COPY = R_ARM_COPY;
   static constexpr u32 R_GLOB_DAT = R_ARM_GLOB_DAT;
@@ -1973,7 +1974,7 @@ struct RV64 {
   static constexpr u32 plt_hdr_size = 32;
   static constexpr u32 plt_size = 16;
   static constexpr u32 pltgot_size = 16;
-  static constexpr u8 filler[] = { 0x02, 0x90 };
+  static constexpr u8 filler[] = { 0x02, 0x90 }; // ebreak
 
   static constexpr u32 R_COPY = R_RISCV_COPY;
   static constexpr u32 R_GLOB_DAT = R_RISCV_64;
@@ -2006,7 +2007,7 @@ struct RV32 {
   static constexpr u32 plt_hdr_size = 32;
   static constexpr u32 plt_size = 16;
   static constexpr u32 pltgot_size = 16;
-  static constexpr u8 filler[] = { 0x02, 0x90 };
+  static constexpr u8 filler[] = { 0x02, 0x90 }; // ebreak
 
   static constexpr u32 R_COPY = R_RISCV_COPY;
   static constexpr u32 R_GLOB_DAT = R_RISCV_32;
@@ -2043,7 +2044,7 @@ struct PPC32 {
   static constexpr u32 pltgot_size = 36;
   static constexpr u32 thunk_hdr_size = 0;
   static constexpr u32 thunk_size = 36;
-  static constexpr u8 filler[] = { 0x7f, 0xe0, 0x00, 0x08 };
+  static constexpr u8 filler[] = { 0x7f, 0xe0, 0x00, 0x08 }; // trap
 
   static constexpr u32 R_COPY = R_PPC_COPY;
   static constexpr u32 R_GLOB_DAT = R_PPC_GLOB_DAT;
@@ -2085,7 +2086,7 @@ struct PPC64V1 : PPC64 {
   static constexpr u32 pltgot_size = 0;
   static constexpr u32 thunk_hdr_size = 0;
   static constexpr u32 thunk_size = 28;
-  static constexpr u8 filler[] = { 0x7f, 0xe0, 0x00, 0x08 };
+  static constexpr u8 filler[] = { 0x7f, 0xe0, 0x00, 0x08 }; // trap
 };
 
 struct PPC64V2 : PPC64 {
@@ -2096,7 +2097,7 @@ struct PPC64V2 : PPC64 {
   static constexpr u32 pltgot_size = 0;
   static constexpr u32 thunk_hdr_size = 0;
   static constexpr u32 thunk_size = 24;
-  static constexpr u8 filler[] = { 0x08, 0x00, 0xe0, 0x7f };
+  static constexpr u8 filler[] = { 0x08, 0x00, 0xe0, 0x7f }; // trap
 };
 
 struct S390X {
@@ -2109,7 +2110,7 @@ struct S390X {
   static constexpr u32 plt_hdr_size = 48;
   static constexpr u32 plt_size = 16;
   static constexpr u32 pltgot_size = 16;
-  static constexpr u8 filler[] = { 0x07, 0x00 };
+  static constexpr u8 filler[] = { 0x07, 0x00 }; // nop
 
   static constexpr u32 R_COPY = R_390_COPY;
   static constexpr u32 R_GLOB_DAT = R_390_GLOB_DAT;
@@ -2133,7 +2134,7 @@ struct SPARC64 {
   static constexpr u32 plt_hdr_size = 128;
   static constexpr u32 plt_size = 32;
   static constexpr u32 pltgot_size = 32;
-  static constexpr u8 filler[] = { 0x91, 0xd0, 0x20, 0x05 };
+  static constexpr u8 filler[] = { 0x91, 0xd0, 0x20, 0x05 }; // ta 5
 
   static constexpr u32 R_COPY = R_SPARC_COPY;
   static constexpr u32 R_GLOB_DAT = R_SPARC_GLOB_DAT;
@@ -2157,7 +2158,7 @@ struct M68K {
   static constexpr u32 plt_hdr_size = 18;
   static constexpr u32 plt_size = 14;
   static constexpr u32 pltgot_size = 8;
-  static constexpr u8 filler[] = { 0x4a, 0xfc };
+  static constexpr u8 filler[] = { 0x4a, 0xfc }; // illegal
 
   static constexpr u32 R_COPY = R_68K_COPY;
   static constexpr u32 R_GLOB_DAT = R_68K_GLOB_DAT;
@@ -2180,7 +2181,7 @@ struct SH4 {
   static constexpr u32 plt_hdr_size = 16;
   static constexpr u32 plt_size = 16;
   static constexpr u32 pltgot_size = 12;
-  static constexpr u8 filler[] = { 0x00, 0x00 };
+  static constexpr u8 filler[] = { 0x00, 0x90 }; // nop
 
   static constexpr u32 R_COPY = R_SH_COPY;
   static constexpr u32 R_GLOB_DAT = R_SH_GLOB_DAT;
@@ -2203,7 +2204,7 @@ struct ALPHA {
   static constexpr u32 plt_hdr_size = 0;
   static constexpr u32 plt_size = 0;
   static constexpr u32 pltgot_size = 0;
-  static constexpr u8 filler[] = { 0x81, 0x00, 0x00, 0x00 };
+  static constexpr u8 filler[] = { 0x81, 0x00, 0x00, 0x00 }; // bugchk
 
   static constexpr u32 R_COPY = R_ALPHA_COPY;
   static constexpr u32 R_GLOB_DAT = R_ALPHA_GLOB_DAT;
@@ -2228,7 +2229,7 @@ struct LOONGARCH64 {
   static constexpr u32 pltgot_size = 16;
   static constexpr u32 thunk_hdr_size = 0;
   static constexpr u32 thunk_size = 8;
-  static constexpr u8 filler[] = { 0x00, 0x00, 0x2a, 0x00 };
+  static constexpr u8 filler[] = { 0x00, 0x00, 0x2a, 0x00 }; // break 0
 
   static constexpr u32 R_COPY = R_LARCH_COPY;
   static constexpr u32 R_GLOB_DAT = R_LARCH_64;
@@ -2254,7 +2255,7 @@ struct LOONGARCH32 {
   static constexpr u32 pltgot_size = 16;
   static constexpr u32 thunk_hdr_size = 0;
   static constexpr u32 thunk_size = 8;
-  static constexpr u8 filler[] = { 0x00, 0x00, 0x2a, 0x00 };
+  static constexpr u8 filler[] = { 0x00, 0x00, 0x2a, 0x00 }; // break 0
 
   static constexpr u32 R_COPY = R_LARCH_COPY;
   static constexpr u32 R_GLOB_DAT = R_LARCH_32;

elf/gc-sections.cc

@@ -114,13 +114,11 @@ static void collect_root_set(Context<E> &ctx,
   });
 
   // Add sections referenced by root symbols.
-  enqueue_symbol(get_symbol(ctx, ctx.arg.entry));
+  for (Symbol<E> *sym : ctx.arg.undefined)
+    enqueue_symbol(sym);
 
-  for (std::string_view name : ctx.arg.undefined)
-    enqueue_symbol(get_symbol(ctx, name));
-
-  for (std::string_view name : ctx.arg.require_defined)
-    enqueue_symbol(get_symbol(ctx, name));
+  for (Symbol<E> *sym : ctx.arg.require_defined)
+    enqueue_symbol(sym);
 
   // .eh_frame consists of variable-length records called CIE and FDE
   // records, and they are a unit of inclusion or exclusion.

elf/gdb-index.cc

@@ -141,7 +141,7 @@ struct NameType {
 
 struct MapValue {
   u32 hash = 0;
-  Atomic<u32> count = 0;
+  Atomic<u32> count;
   u32 name_offset = 0;
   u32 type_offset = 0;
 };

elf/input-files.cc

@@ -10,6 +10,48 @@
 
 namespace mold::elf {
 
+// If we haven't seen the same `key` before, create a new instance
+// of Symbol and returns it. Otherwise, returns the previously-
+// instantiated object. `key` is usually the same as `name`.
+template <typename E>
+Symbol<E> *get_symbol(Context<E> &ctx, std::string_view key,
+                      std::string_view name) {
+  typename decltype(ctx.symbol_map)::const_accessor acc;
+  ctx.symbol_map.insert(acc, {key, Symbol<E>(name)});
+  return const_cast<Symbol<E> *>(&acc->second);
+}
+
+template <typename E>
+Symbol<E> *get_symbol(Context<E> &ctx, std::string_view key) {
+  std::string_view name = key.substr(0, key.find('@'));
+  return get_symbol(ctx, key, name);
+}
+
+template <typename E>
+static bool is_rust_symbol(const Symbol<E> &sym) {
+  // The legacy Rust mangling scheme is indistinguishtable from C++.
+  // We don't want to accidentally demangle C++ symbols as Rust ones.
+  // So, the legacy mangling scheme will be demangled only when we
+  // know the object file was created by rustc.
+  if (sym.file && !sym.file->is_dso && ((ObjectFile<E> *)sym.file)->is_rust_obj)
+    return true;
+
+  // "_R" is the prefix of the new Rust mangling scheme.
+  return sym.name().starts_with("_R");
+}
+
+template <typename E>
+std::string_view demangle(const Symbol<E> &sym) {
+  if (is_rust_symbol(sym)) {
+    if (std::optional<std::string_view> s = demangle_rust(sym.name()))
+      return *s;
+  } else {
+    if (std::optional<std::string_view> s = demangle_cpp(sym.name()))
+      return *s;
+  }
+  return sym.name();
+}
+
 template <typename E>
 InputFile<E>::InputFile(Context<E> &ctx, MappedFile<Context<E>> *mf)
   : mf(mf), filename(mf->name) {
@@ -63,7 +105,7 @@ void InputFile<E>::clear_symbols() {
       sym->origin = 0;
       sym->value = -1;
       sym->sym_idx = -1;
-      sym->ver_idx = 0;
+      sym->ver_idx = VER_NDX_UNSPECIFIED;
       sym->is_weak = false;
       sym->is_imported = false;
       sym->is_exported = false;
@@ -196,6 +238,13 @@ void ObjectFile<E>::initialize_sections(Context<E> &ctx) {
   // Read sections
   for (i64 i = 0; i < this->elf_sections.size(); i++) {
     const ElfShdr<E> &shdr = this->elf_sections[i];
+    std::string_view name = this->shstrtab.data() + shdr.sh_name;
+
+    if ((shdr.sh_flags & SHF_EXCLUDE) &&
+        name.starts_with(".gnu.offload_lto_.symtab.")) {
+      this->is_gcc_offload_obj = true;
+      continue;
+    }
 
     if ((shdr.sh_flags & SHF_EXCLUDE) && !(shdr.sh_flags & SHF_ALLOC) &&
         shdr.sh_type != SHT_LLVM_ADDRSIG && !ctx.arg.relocatable)
@@ -255,9 +304,7 @@ void ObjectFile<E>::initialize_sections(Context<E> &ctx) {
     case SHT_STRTAB:
     case SHT_NULL:
       break;
-    default: {
-      std::string_view name = this->shstrtab.data() + shdr.sh_name;
-
+    default:
       // .note.GNU-stack section controls executable-ness of the stack
       // area in GNU linkers. We ignore that section because silently
       // making the stack area executable is too dangerous. Tell our
@@ -299,6 +346,10 @@ void ObjectFile<E>::initialize_sections(Context<E> &ctx) {
           is_debug_section(shdr, name))
         continue;
 
+      if (name == ".comment" &&
+          this->get_string(ctx, shdr).starts_with("rustc "))
+        this->is_rust_obj = true;
+
       // If an output file doesn't have a section header (i.e.
       // --oformat=binary is given), we discard all non-memory-allocated
       // sections. This is because without a section header, we can't find
@@ -310,12 +361,26 @@ void ObjectFile<E>::initialize_sections(Context<E> &ctx) {
 
       // Save .llvm_addrsig for --icf=safe.
       if (shdr.sh_type == SHT_LLVM_ADDRSIG && !ctx.arg.relocatable) {
-        llvm_addrsig = std::move(this->sections[i]);
+        if (shdr.sh_link != 0) {
+          llvm_addrsig = std::move(this->sections[i]);
+        } else {
+          Warn(ctx) << *this << ": ignoring .llvm_addrsig section without"
+                    << " sh_link; was the file processed by strip or objcopy -r?";
+        }
         continue;
       }
 
+      if (shdr.sh_type == SHT_INIT_ARRAY ||
+          shdr.sh_type == SHT_FINI_ARRAY ||
+          shdr.sh_type == SHT_PREINIT_ARRAY)
+        ctx.has_init_array = true;
+
+      if (name == ".ctors" || name.starts_with(".ctors.") ||
+          name == ".dtors" || name.starts_with(".dtors."))
+        ctx.has_ctors = true;
+
       if (name == ".eh_frame")
-        eh_frame_section = this->sections[i].get();
+        eh_frame_sections.push_back(this->sections[i].get());
 
       if constexpr (is_ppc32<E>)
         if (name == ".got2")
@@ -356,7 +421,6 @@ void ObjectFile<E>::initialize_sections(Context<E> &ctx) {
       counter++;
       break;
     }
-    }
   }
 
   // Attach relocation sections to their target sections.
@@ -407,78 +471,75 @@ void ObjectFile<E>::initialize_sections(Context<E> &ctx) {
 // This function parses an input .eh_frame section.
 template <typename E>
 void ObjectFile<E>::parse_ehframe(Context<E> &ctx) {
-  if (!eh_frame_section)
-    return;
+  for (InputSection<E> *isec : eh_frame_sections) {
+    std::span<ElfRel<E>> rels = isec->get_rels(ctx);
+    i64 cies_begin = cies.size();
+    i64 fdes_begin = fdes.size();
 
-  InputSection<E> &isec = *eh_frame_section;
-  std::span<ElfRel<E>> rels = isec.get_rels(ctx);
-  i64 cies_begin = cies.size();
-  i64 fdes_begin = fdes.size();
+    // Read CIEs and FDEs until empty.
+    std::string_view contents = this->get_string(ctx, isec->shdr());
+    i64 rel_idx = 0;
 
-  // Read CIEs and FDEs until empty.
-  std::string_view contents = this->get_string(ctx, isec.shdr());
-  i64 rel_idx = 0;
+    for (std::string_view data = contents; !data.empty();) {
+      i64 size = *(U32<E> *)data.data();
+      if (size == 0)
+        break;
 
-  for (std::string_view data = contents; !data.empty();) {
-    i64 size = *(U32<E> *)data.data();
-    if (size == 0)
-      break;
+      i64 begin_offset = data.data() - contents.data();
+      i64 end_offset = begin_offset + size + 4;
+      i64 id = *(U32<E> *)(data.data() + 4);
+      data = data.substr(size + 4);
 
-    i64 begin_offset = data.data() - contents.data();
-    i64 end_offset = begin_offset + size + 4;
-    i64 id = *(U32<E> *)(data.data() + 4);
-    data = data.substr(size + 4);
+      i64 rel_begin = rel_idx;
+      while (rel_idx < rels.size() && rels[rel_idx].r_offset < end_offset)
+        rel_idx++;
+      assert(rel_idx == rels.size() || begin_offset <= rels[rel_begin].r_offset);
 
-    i64 rel_begin = rel_idx;
-    while (rel_idx < rels.size() && rels[rel_idx].r_offset < end_offset)
-      rel_idx++;
-    assert(rel_idx == rels.size() || begin_offset <= rels[rel_begin].r_offset);
+      if (id == 0) {
+        // This is CIE.
+        cies.emplace_back(ctx, *this, *isec, begin_offset, rels, rel_begin);
+      } else {
+        // This is FDE.
+        if (rel_begin == rel_idx || rels[rel_begin].r_sym == 0) {
+          // FDE has no valid relocation, which means FDE is dead from
+          // the beginning. Compilers usually don't create such FDE, but
+          // `ld -r` tend to generate such dead FDEs.
+          continue;
+        }
 
-    if (id == 0) {
-      // This is CIE.
-      cies.emplace_back(ctx, *this, isec, begin_offset, rels, rel_begin);
-    } else {
-      // This is FDE.
-      if (rel_begin == rel_idx || rels[rel_begin].r_sym == 0) {
-        // FDE has no valid relocation, which means FDE is dead from
-        // the beginning. Compilers usually don't create such FDE, but
-        // `ld -r` tend to generate such dead FDEs.
-        continue;
+        if (rels[rel_begin].r_offset - begin_offset != 8)
+          Fatal(ctx) << *isec << ": FDE's first relocation should have offset 8";
+
+        fdes.emplace_back(begin_offset, rel_begin);
       }
+    }
 
-      if (rels[rel_begin].r_offset - begin_offset != 8)
-        Fatal(ctx) << isec << ": FDE's first relocation should have offset 8";
+    // Associate CIEs to FDEs.
+    auto find_cie = [&](i64 offset) {
+      for (i64 i = cies_begin; i < cies.size(); i++)
+        if (cies[i].input_offset == offset)
+          return i;
+      Fatal(ctx) << *isec << ": bad FDE pointer";
+    };
 
-      fdes.emplace_back(begin_offset, rel_begin);
+    for (i64 i = fdes_begin; i < fdes.size(); i++) {
+      i64 cie_offset = *(I32<E> *)(contents.data() + fdes[i].input_offset + 4);
+      fdes[i].cie_idx = find_cie(fdes[i].input_offset + 4 - cie_offset);
     }
   }
 
-  // Associate CIEs to FDEs.
-  auto find_cie = [&](i64 offset) {
-    for (i64 i = cies_begin; i < cies.size(); i++)
-      if (cies[i].input_offset == offset)
-        return i;
-    Fatal(ctx) << isec << ": bad FDE pointer";
-  };
-
-  for (i64 i = fdes_begin; i < fdes.size(); i++) {
-    i64 cie_offset = *(I32<E> *)(contents.data() + fdes[i].input_offset + 4);
-    fdes[i].cie_idx = find_cie(fdes[i].input_offset + 4 - cie_offset);
-  }
-
-  auto get_isec = [&](const FdeRecord<E> &fde) -> InputSection<E> * {
-    return get_section(this->elf_syms[rels[fde.rel_idx].r_sym]);
+  auto get_isec = [&](const FdeRecord<E> &fde) {
+    return get_section(this->elf_syms[fde.get_rels(*this)[0].r_sym]);
   };
 
   // We assume that FDEs for the same input sections are contiguous
   // in `fdes` vector.
-  std::stable_sort(fdes.begin() + fdes_begin, fdes.end(),
-                   [&](const FdeRecord<E> &a, const FdeRecord<E> &b) {
+  sort(fdes, [&](const FdeRecord<E> &a, const FdeRecord<E> &b) {
     return get_isec(a)->get_priority() < get_isec(b)->get_priority();
   });
 
   // Associate FDEs to input sections.
-  for (i64 i = fdes_begin; i < fdes.size();) {
+  for (i64 i = 0; i < fdes.size();) {
     InputSection<E> *isec = get_isec(fdes[i]);
     assert(isec->fde_begin == -1);
     isec->fde_begin = i++;
@@ -489,29 +550,9 @@ void ObjectFile<E>::parse_ehframe(Context<E> &ctx) {
   }
 }
 
-// Returns a symbol object for a given key. This function handles
-// the -wrap option.
-template <typename E>
-static Symbol<E> *insert_symbol(Context<E> &ctx, const ElfSym<E> &esym,
-                                std::string_view key, std::string_view name) {
-  if (esym.is_undef() && name.starts_with("__real_") &&
-      ctx.arg.wrap.contains(name.substr(7))) {
-    return get_symbol(ctx, key.substr(7), name.substr(7));
-  }
-
-  Symbol<E> *sym = get_symbol(ctx, key, name);
-
-  if (esym.is_undef() && sym->is_wrapped) {
-    key = save_string(ctx, "__wrap_" + std::string(key));
-    name = save_string(ctx, "__wrap_" + std::string(name));
-    return get_symbol(ctx, key, name);
-  }
-  return sym;
-}
-
 template <typename E>
 void ObjectFile<E>::initialize_symbols(Context<E> &ctx) {
-  if (!symtab_sec)
+  if (this->elf_syms.empty())
     return;
 
   static Counter counter("all_syms");
@@ -555,6 +596,9 @@ void ObjectFile<E>::initialize_symbols(Context<E> &ctx) {
   for (i64 i = this->first_global; i < this->elf_syms.size(); i++) {
     const ElfSym<E> &esym = this->elf_syms[i];
 
+    if (esym.is_common())
+      has_common_symbol = true;
+
     // Get a symbol name
     std::string_view key = this->symbol_strtab.data() + esym.st_name;
     std::string_view name = key;
@@ -571,9 +615,21 @@ void ObjectFile<E>::initialize_symbols(Context<E> &ctx) {
       }
     }
 
-    this->symbols[i] = insert_symbol(ctx, esym, key, name);
-    if (esym.is_common())
-      has_common_symbol = true;
+    // Handle --wrap option
+    Symbol<E> *sym;
+    if (esym.is_undef() && name.starts_with("__real_") &&
+        ctx.arg.wrap.contains(name.substr(7))) {
+      sym = get_symbol(ctx, key.substr(7), name.substr(7));
+    } else {
+      sym = get_symbol(ctx, key, name);
+      if (esym.is_undef() && sym->is_wrapped) {
+        key = save_string(ctx, "__wrap_" + std::string(key));
+        name = save_string(ctx, "__wrap_" + std::string(name));
+        sym = get_symbol(ctx, key, name);
+      }
+    }
+
+    this->symbols[i] = sym;
   }
 }
 
@@ -644,9 +700,13 @@ split_section(Context<E> &ctx, InputSection<E> &sec) {
   if (entsize == 0)
     return nullptr;
 
+  i64 addralign = shdr.sh_addralign;
+  if (addralign == 0)
+    addralign = 1;
+
   std::unique_ptr<MergeableSection<E>> rec(new MergeableSection<E>);
   rec->parent = MergedSection<E>::get_instance(ctx, sec.name(), shdr.sh_type,
-                                               shdr.sh_flags, entsize);
+                                               shdr.sh_flags, entsize, addralign);
   rec->p2align = sec.p2align;
 
   if (sec.sh_size == 0)
@@ -1277,17 +1337,17 @@ void SharedFile<E>::parse(Context<E> &ctx) {
       continue;
 
     std::string_view name = this->symbol_strtab.data() + esyms[i].st_name;
-    bool is_hidden = (!vers.empty() && (vers[i] & VERSYM_HIDDEN));
+    bool is_default = vers.empty() || !(vers[i] & VERSYM_HIDDEN);
 
     this->elf_syms2.push_back(esyms[i]);
     this->versyms.push_back(ver);
 
-    if (is_hidden) {
+    if (is_default) {
+      this->symbols.push_back(get_symbol(ctx, name));
+    } else {
       std::string_view mangled_name = save_string(
         ctx, std::string(name) + "@" + std::string(version_strings[ver]));
       this->symbols.push_back(get_symbol(ctx, mangled_name, name));
-    } else {
-      this->symbols.push_back(get_symbol(ctx, name));
     }
   }
 
@@ -1342,6 +1402,9 @@ std::vector<std::string_view> SharedFile<E>::read_verdef(Context<E> &ctx) {
   ElfVerdef<E> *ver = (ElfVerdef<E> *)verdef.data();
 
   for (;;) {
+    if (ver->vd_ndx == VER_NDX_UNSPECIFIED)
+      Fatal(ctx) << *this << ": symbol version too large";
+
     if (ret.size() <= ver->vd_ndx)
       ret.resize(ver->vd_ndx + 1);
 
@@ -1371,7 +1434,7 @@ void SharedFile<E>::resolve_symbols(Context<E> &ctx) {
       sym.value = esym.st_value;
       sym.sym_idx = i;
       sym.ver_idx = versyms[i];
-      sym.is_weak = false;
+      sym.is_weak = true;
     }
   }
 }
@@ -1499,6 +1562,9 @@ using E = MOLD_TARGET;
 template class InputFile<E>;
 template class ObjectFile<E>;
 template class SharedFile<E>;
+template Symbol<E> *get_symbol(Context<E> &, std::string_view, std::string_view);
+template Symbol<E> *get_symbol(Context<E> &, std::string_view);
+template std::string_view demangle(const Symbol<E> &);
 template std::ostream &operator<<(std::ostream &, const InputFile<E> &);
 
 } // namespace mold::elf

elf/input-sections.cc

@@ -274,7 +274,7 @@ static Action get_absrel_action(Context<E> &ctx, Symbol<E> &sym) {
 template <typename E>
 static Action get_dyn_absrel_action(Context<E> &ctx, Symbol<E> &sym) {
   if (sym.is_ifunc())
-    return ctx.arg.pic ? IFUNC_DYNREL : NONE;
+    return sym.is_pde_ifunc(ctx) ? NONE : IFUNC_DYNREL;
 
   // This is a decision table for absolute relocations for the pointer
   // size data (e.g. R_X86_64_64). Unlike the absrel_table, we can emit
@@ -457,31 +457,20 @@ void InputSection<E>::write_to(Context<E> &ctx, u8 *buf) {
       apply_reloc_alloc(ctx, buf);
     else
       apply_reloc_nonalloc(ctx, buf);
-
-    if constexpr (is_x86_64<E>) {
-      u8 endbr[] = {0xf3, 0x0f, 0x1e, 0xfa};
-      u8 nop[] = {0x0f, 0x1f, 0x40, 0x00};
-
-      // Rewrite the leading endbr instruction with a nop if the section
-      // is not address-taken.
-      if (ctx.arg.z_rewrite_endbr && (shdr().sh_flags & SHF_EXECINSTR) &&
-          !address_taken && sh_size >= 4 && memcmp(buf, endbr, 4) == 0) {
-        memcpy(buf, nop, 4);
-      }
-    }
   }
 }
 
 // Get the name of a function containin a given offset.
 template <typename E>
-std::string_view InputSection<E>::get_func_name(Context<E> &ctx, i64 offset) const {
-  for (const ElfSym<E> &esym : file.elf_syms) {
+std::string_view
+InputSection<E>::get_func_name(Context<E> &ctx, i64 offset) const {
+  for (Symbol<E> *sym : file.symbols) {
+    const ElfSym<E> &esym = sym->esym();
     if (esym.st_shndx == shndx && esym.st_type == STT_FUNC &&
         esym.st_value <= offset && offset < esym.st_value + esym.st_size) {
-      std::string_view name = file.symbol_strtab.data() + esym.st_name;
       if (ctx.arg.demangle)
-        return demangle(name);
-      return name;
+        return demangle(*sym);
+      return sym->name();
     }
   }
   return "";
@@ -520,7 +509,7 @@ bool InputSection<E>::record_undef_error(Context<E> &ctx, const ElfRel<E> &rel)
       ss << ":(" << func << ")";
 
     typename decltype(ctx.undef_errors)::accessor acc;
-    ctx.undef_errors.insert(acc, {sym.name(), {}});
+    ctx.undef_errors.insert(acc, {&sym, {}});
     acc->second.push_back(ss.str());
   };
 

elf/linker-script.cc

@@ -10,9 +10,6 @@
 
 namespace mold::elf {
 
-template <typename E>
-static thread_local MappedFile<Context<E>> *current_file;
-
 template <typename E>
 void read_version_script(Context<E> &ctx, std::span<std::string_view> &tok);
 
@@ -37,7 +34,7 @@ template <typename E>
 class SyntaxError {
 public:
   SyntaxError(Context<E> &ctx, std::string_view errpos) : out(ctx) {
-    std::string_view contents = current_file<E>->get_contents();
+    std::string_view contents = ctx.script_file->get_contents();
     std::string_view line = get_line(contents, errpos.data());
 
     i64 lineno = 1;
@@ -48,7 +45,7 @@ public:
     i64 column = errpos.data() - line.data();
 
     std::stringstream ss;
-    ss << current_file<E>->name << ":" << lineno << ": ";
+    ss << ctx.script_file->name << ":" << lineno << ": ";
     i64 indent = (i64)ss.tellp() + strlen("mold: ");
     ss << line << "\n" << std::setw(indent + column) << " " << "^ ";
     out << ss.str();
@@ -118,7 +115,7 @@ template <typename E>
 static std::span<std::string_view>
 skip(Context<E> &ctx, std::span<std::string_view> tok, std::string_view str) {
   if (tok.empty())
-    Fatal(ctx) << current_file<E>->name << ": expected '" << str
+    Fatal(ctx) << ctx.script_file->name << ": expected '" << str
                << "', but got EOF";
   if (tok[0] != str)
     SyntaxError(ctx, tok[0]) << "expected '" << str << "'";
@@ -140,7 +137,7 @@ read_output_format(Context<E> &ctx, std::span<std::string_view> tok) {
   while (!tok.empty() && tok[0] != ")")
     tok = tok.subspan(1);
   if (tok.empty())
-    Fatal(ctx) << current_file<E>->name << ": expected ')', but got EOF";
+    Fatal(ctx) << ctx.script_file->name << ": expected ')', but got EOF";
   return tok.subspan(1);
 }
 
@@ -158,7 +155,7 @@ static MappedFile<Context<E>> *resolve_path(Context<E> &ctx, std::string_view to
 
   // GNU ld prepends the sysroot if a pathname starts with '/' and the
   // script being processed is in the sysroot. We do the same.
-  if (str.starts_with('/') && is_in_sysroot(ctx, current_file<E>->name))
+  if (str.starts_with('/') && is_in_sysroot(ctx, ctx.script_file->name))
     return MappedFile<Context<E>>::must_open(ctx, ctx.arg.sysroot + str);
 
   if (str.starts_with('=')) {
@@ -205,13 +202,13 @@ read_group(Context<E> &ctx, std::span<std::string_view> tok) {
   }
 
   if (tok.empty())
-    Fatal(ctx) << current_file<E>->name << ": expected ')', but got EOF";
+    Fatal(ctx) << ctx.script_file->name << ": expected ')', but got EOF";
   return tok.subspan(1);
 }
 
 template <typename E>
 void parse_linker_script(Context<E> &ctx, MappedFile<Context<E>> *mf) {
-  current_file<E> = mf;
+  ctx.script_file = mf;
 
   std::vector<std::string_view> vec = tokenize(ctx, mf->get_contents());
   std::span<std::string_view> tok = vec;
@@ -241,7 +238,7 @@ void parse_linker_script(Context<E> &ctx, MappedFile<Context<E>> *mf) {
 template <typename E>
 std::string_view
 get_script_output_type(Context<E> &ctx, MappedFile<Context<E>> *mf) {
-  current_file<E> = mf;
+  ctx.script_file = mf;
 
   std::vector<std::string_view> vec = tokenize(ctx, mf->get_contents());
   std::span<std::string_view> tok = vec;
@@ -312,12 +309,11 @@ read_version_script_commands(Context<E> &ctx, std::span<std::string_view> &tok,
 
     if (tok[0] == "*") {
       ctx.default_version = (is_global ? ver_idx : (u32)VER_NDX_LOCAL);
-      ctx.default_version_from_version_script = true;
     } else if (is_global) {
-      ctx.version_patterns.push_back({unquote(tok[0]), current_file<E>->name,
+      ctx.version_patterns.push_back({unquote(tok[0]), ctx.script_file->name,
                                       ver_str, ver_idx, is_cpp});
     } else {
-      ctx.version_patterns.push_back({unquote(tok[0]), current_file<E>->name,
+      ctx.version_patterns.push_back({unquote(tok[0]), ctx.script_file->name,
                                       ver_str, VER_NDX_LOCAL, is_cpp});
     }
 
@@ -358,7 +354,7 @@ void read_version_script(Context<E> &ctx, std::span<std::string_view> &tok) {
 
 template <typename E>
 void parse_version_script(Context<E> &ctx, MappedFile<Context<E>> *mf) {
-  current_file<E> = mf;
+  ctx.script_file = mf;
   std::vector<std::string_view> vec = tokenize(ctx, mf->get_contents());
   std::span<std::string_view> tok = vec;
   read_version_script(ctx, tok);
@@ -367,7 +363,9 @@ void parse_version_script(Context<E> &ctx, MappedFile<Context<E>> *mf) {
 }
 
 template <typename E>
-void read_dynamic_list_commands(Context<E> &ctx, std::span<std::string_view> &tok,
+void read_dynamic_list_commands(Context<E> &ctx,
+                                std::vector<DynamicPattern> &result,
+                                std::span<std::string_view> &tok,
                                 bool is_cpp) {
   while (!tok.empty() && tok[0] != "}") {
     if (tok[0] == "extern") {
@@ -376,11 +374,11 @@ void read_dynamic_list_commands(Context<E> &ctx, std::span<std::string_view> &to
       if (!tok.empty() && tok[0] == "\"C\"") {
         tok = tok.subspan(1);
         tok = skip(ctx, tok, "{");
-        read_dynamic_list_commands(ctx, tok, false);
+        read_dynamic_list_commands(ctx, result, tok, false);
       } else {
         tok = skip(ctx, tok, "\"C++\"");
         tok = skip(ctx, tok, "{");
-        read_dynamic_list_commands(ctx, tok, true);
+        read_dynamic_list_commands(ctx, result, tok, true);
       }
 
       tok = skip(ctx, tok, "}");
@@ -388,29 +386,32 @@ void read_dynamic_list_commands(Context<E> &ctx, std::span<std::string_view> &to
       continue;
     }
 
-    if (tok[0] == "*")
-      ctx.default_version = VER_NDX_GLOBAL;
-    else
-      ctx.version_patterns.push_back({unquote(tok[0]), current_file<E>->name,
-                                      "global", VER_NDX_GLOBAL, is_cpp});
-
+    result.push_back({unquote(tok[0]), "", is_cpp});
     tok = skip(ctx, tok.subspan(1), ";");
   }
 }
 
 template <typename E>
-void parse_dynamic_list(Context<E> &ctx, MappedFile<Context<E>> *mf) {
-  current_file<E> = mf;
-  std::vector<std::string_view> vec = tokenize(ctx, mf->get_contents());
+std::vector<DynamicPattern>
+parse_dynamic_list(Context<E> &ctx, std::string_view path) {
+  std::string_view contents =
+    MappedFile<Context<E>>::must_open(ctx, std::string(path))->get_contents();
+  std::vector<std::string_view> vec = tokenize(ctx, contents);
   std::span<std::string_view> tok = vec;
+  std::vector<DynamicPattern> result;
 
   tok = skip(ctx, tok, "{");
-  read_dynamic_list_commands(ctx, tok, false);
+  read_dynamic_list_commands(ctx, result, tok, false);
   tok = skip(ctx, tok, "}");
   tok = skip(ctx, tok, ";");
 
   if (!tok.empty())
     SyntaxError(ctx, tok[0]) << "trailing garbage token";
+
+  for (DynamicPattern &p : result)
+    p.source = path;
+
+  return result;
 }
 
 using E = MOLD_TARGET;
@@ -418,6 +419,7 @@ using E = MOLD_TARGET;
 template void parse_linker_script(Context<E> &, MappedFile<Context<E>> *);
 template std::string_view get_script_output_type(Context<E> &, MappedFile<Context<E>> *);
 template void parse_version_script(Context<E> &, MappedFile<Context<E>> *);
-template void parse_dynamic_list(Context<E> &, MappedFile<Context<E>> *);
+template std::vector<DynamicPattern> parse_dynamic_list(Context<E> &, std::string_view);
+
 
 } // namespace mold::elf

elf/lto-unix.cc

@@ -439,72 +439,77 @@ get_api_version(const char *plugin_identifier,
   return LAPI_V0;
 }
 
+// dlopen the linker plugin file
 template <typename E>
-static void load_plugin(Context<E> &ctx) {
-  assert(phase == 0);
-  phase = 1;
-  gctx<E> = &ctx;
+static void load_lto_plugin(Context<E> &ctx) {
+  static std::once_flag flag;
 
-  void *handle = dlopen(ctx.arg.plugin.c_str(), RTLD_NOW | RTLD_GLOBAL);
-  if (!handle)
-    Fatal(ctx) << "could not open plugin file: " << dlerror();
+  std::call_once(flag, [&] {
+    assert(phase == 0);
+    phase = 1;
+    gctx<E> = &ctx;
 
-  OnloadFn *onload = (OnloadFn *)dlsym(handle, "onload");
-  if (!onload)
-    Fatal(ctx) << "failed to load plugin " << ctx.arg.plugin << ": "
-               << dlerror();
+    void *handle = dlopen(ctx.arg.plugin.c_str(), RTLD_NOW | RTLD_GLOBAL);
+    if (!handle)
+      Fatal(ctx) << "could not open plugin file: " << dlerror();
 
-  auto save = [&](std::string_view str) {
-    return save_string(ctx, std::string(str).c_str()).data();
-  };
+    OnloadFn *onload = (OnloadFn *)dlsym(handle, "onload");
+    if (!onload)
+      Fatal(ctx) << "failed to load plugin " << ctx.arg.plugin << ": "
+                 << dlerror();
 
-  std::vector<PluginTagValue> tv;
-  tv.emplace_back(LDPT_MESSAGE, message<E>);
+    auto save = [&](std::string_view str) {
+      return save_string(ctx, std::string(str).c_str()).data();
+    };
 
-  if (ctx.arg.shared)
-    tv.emplace_back(LDPT_LINKER_OUTPUT, LDPO_DYN);
-  else if (ctx.arg.pie)
-    tv.emplace_back(LDPT_LINKER_OUTPUT, LDPO_PIE);
-  else
-    tv.emplace_back(LDPT_LINKER_OUTPUT, LDPO_EXEC);
+    std::vector<PluginTagValue> tv;
+    tv.emplace_back(LDPT_MESSAGE, message<E>);
 
-  for (std::string_view opt : ctx.arg.plugin_opt)
-    tv.emplace_back(LDPT_OPTION, save(opt));
+    if (ctx.arg.shared)
+      tv.emplace_back(LDPT_LINKER_OUTPUT, LDPO_DYN);
+    else if (ctx.arg.pie)
+      tv.emplace_back(LDPT_LINKER_OUTPUT, LDPO_PIE);
+    else
+      tv.emplace_back(LDPT_LINKER_OUTPUT, LDPO_EXEC);
 
-  tv.emplace_back(LDPT_REGISTER_CLAIM_FILE_HOOK, register_claim_file_hook<E>);
-  tv.emplace_back(LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK,
-                  register_all_symbols_read_hook<E>);
-  tv.emplace_back(LDPT_REGISTER_CLEANUP_HOOK, register_cleanup_hook<E>);
-  tv.emplace_back(LDPT_ADD_SYMBOLS, add_symbols);
-  tv.emplace_back(LDPT_GET_SYMBOLS, get_symbols_v1);
-  tv.emplace_back(LDPT_ADD_INPUT_FILE, add_input_file<E>);
-  tv.emplace_back(LDPT_GET_INPUT_FILE, get_input_file);
-  tv.emplace_back(LDPT_RELEASE_INPUT_FILE, release_input_file<E>);
-  tv.emplace_back(LDPT_ADD_INPUT_LIBRARY, add_input_library);
-  tv.emplace_back(LDPT_OUTPUT_NAME, save(ctx.arg.output));
-  tv.emplace_back(LDPT_SET_EXTRA_LIBRARY_PATH, set_extra_library_path);
-  tv.emplace_back(LDPT_GET_VIEW, get_view<E>);
-  tv.emplace_back(LDPT_GET_INPUT_SECTION_COUNT, get_input_section_count);
-  tv.emplace_back(LDPT_GET_INPUT_SECTION_TYPE, get_input_section_type);
-  tv.emplace_back(LDPT_GET_INPUT_SECTION_NAME, get_input_section_name);
-  tv.emplace_back(LDPT_GET_INPUT_SECTION_CONTENTS, get_input_section_contents);
-  tv.emplace_back(LDPT_UPDATE_SECTION_ORDER, update_section_order);
-  tv.emplace_back(LDPT_ALLOW_SECTION_ORDERING, allow_section_ordering);
-  tv.emplace_back(LDPT_ADD_SYMBOLS_V2, add_symbols);
-  tv.emplace_back(LDPT_GET_SYMBOLS_V2, get_symbols_v2<E>);
-  tv.emplace_back(LDPT_ALLOW_UNIQUE_SEGMENT_FOR_SECTIONS,
-                  allow_unique_segment_for_sections);
-  tv.emplace_back(LDPT_UNIQUE_SEGMENT_FOR_SECTIONS, unique_segment_for_sections);
-  tv.emplace_back(LDPT_GET_SYMBOLS_V3, get_symbols_v3<E>);
-  tv.emplace_back(LDPT_GET_INPUT_SECTION_ALIGNMENT, get_input_section_alignment);
-  tv.emplace_back(LDPT_GET_INPUT_SECTION_SIZE, get_input_section_size);
-  tv.emplace_back(LDPT_REGISTER_NEW_INPUT_HOOK, register_new_input_hook<E>);
-  tv.emplace_back(LDPT_GET_WRAP_SYMBOLS, get_wrap_symbols);
-  tv.emplace_back(LDPT_GET_API_VERSION, get_api_version<E>);
-  tv.emplace_back(LDPT_NULL, 0);
+    for (std::string_view opt : ctx.arg.plugin_opt)
+      tv.emplace_back(LDPT_OPTION, save(opt));
 
-  [[maybe_unused]] PluginStatus status = onload(tv.data());
-  assert(status == LDPS_OK);
+    tv.emplace_back(LDPT_REGISTER_CLAIM_FILE_HOOK, register_claim_file_hook<E>);
+    tv.emplace_back(LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK,
+                    register_all_symbols_read_hook<E>);
+    tv.emplace_back(LDPT_REGISTER_CLEANUP_HOOK, register_cleanup_hook<E>);
+    tv.emplace_back(LDPT_ADD_SYMBOLS, add_symbols);
+    tv.emplace_back(LDPT_GET_SYMBOLS, get_symbols_v1);
+    tv.emplace_back(LDPT_ADD_INPUT_FILE, add_input_file<E>);
+    tv.emplace_back(LDPT_GET_INPUT_FILE, get_input_file);
+    tv.emplace_back(LDPT_RELEASE_INPUT_FILE, release_input_file<E>);
+    tv.emplace_back(LDPT_ADD_INPUT_LIBRARY, add_input_library);
+    tv.emplace_back(LDPT_OUTPUT_NAME, save(ctx.arg.output));
+    tv.emplace_back(LDPT_SET_EXTRA_LIBRARY_PATH, set_extra_library_path);
+    tv.emplace_back(LDPT_GET_VIEW, get_view<E>);
+    tv.emplace_back(LDPT_GET_INPUT_SECTION_COUNT, get_input_section_count);
+    tv.emplace_back(LDPT_GET_INPUT_SECTION_TYPE, get_input_section_type);
+    tv.emplace_back(LDPT_GET_INPUT_SECTION_NAME, get_input_section_name);
+    tv.emplace_back(LDPT_GET_INPUT_SECTION_CONTENTS, get_input_section_contents);
+    tv.emplace_back(LDPT_UPDATE_SECTION_ORDER, update_section_order);
+    tv.emplace_back(LDPT_ALLOW_SECTION_ORDERING, allow_section_ordering);
+    tv.emplace_back(LDPT_ADD_SYMBOLS_V2, add_symbols);
+    tv.emplace_back(LDPT_GET_SYMBOLS_V2, get_symbols_v2<E>);
+    tv.emplace_back(LDPT_ALLOW_UNIQUE_SEGMENT_FOR_SECTIONS,
+                    allow_unique_segment_for_sections);
+    tv.emplace_back(LDPT_UNIQUE_SEGMENT_FOR_SECTIONS, unique_segment_for_sections);
+    tv.emplace_back(LDPT_GET_SYMBOLS_V3, get_symbols_v3<E>);
+    tv.emplace_back(LDPT_GET_INPUT_SECTION_ALIGNMENT, get_input_section_alignment);
+    tv.emplace_back(LDPT_GET_INPUT_SECTION_SIZE, get_input_section_size);
+    tv.emplace_back(LDPT_REGISTER_NEW_INPUT_HOOK, register_new_input_hook<E>);
+    tv.emplace_back(LDPT_GET_WRAP_SYMBOLS, get_wrap_symbols);
+    tv.emplace_back(LDPT_GET_API_VERSION, get_api_version<E>);
+    tv.emplace_back(LDPT_NULL, 0);
+
+    [[maybe_unused]] PluginStatus status = onload(tv.data());
+    assert(status == LDPS_OK);
+  });
 }
 
 template <typename E>
@@ -575,8 +580,29 @@ static bool supports_v3_api(Context<E> &ctx) {
   return is_gcc_linker_api_v1 || is_llvm(ctx);
 }
 
+template <typename E>
+static PluginInputFile
+create_plugin_input_file(Context<E> &ctx, MappedFile<Context<E>> *mf) {
+  PluginInputFile file;
+  MappedFile<Context<E>> *mf2 = mf->parent ? mf->parent : mf;
+
+  file.name = save_string(ctx, mf2->name).data();
+  file.offset = mf->get_offset();
+  file.filesize = mf->size;
+
+  if (mf2->fd == -1)
+    mf2->fd = open(file.name, O_RDONLY);
+  file.fd = mf2->fd;
+
+  if (file.fd == -1)
+    Fatal(ctx) << "cannot open " << file.name << ": " << errno_string();
+  return file;
+}
+
 template <typename E>
 ObjectFile<E> *read_lto_object(Context<E> &ctx, MappedFile<Context<E>> *mf) {
+  load_lto_plugin(ctx);
+
   // V0 API's claim_file is not thread-safe.
   static std::mutex mu;
   std::unique_lock lock(mu, std::defer_lock);
@@ -589,10 +615,6 @@ ObjectFile<E> *read_lto_object(Context<E> &ctx, MappedFile<Context<E>> *mf) {
                << "added -flto not only for creating object files but also for "
                << "creating the final executable.";
 
-  // dlopen the linker plugin file
-  static std::once_flag flag;
-  std::call_once(flag, [&] { load_plugin(ctx); });
-
   // Create mold's object instance
   ObjectFile<E> *obj = new ObjectFile<E>;
   ctx.obj_pool.emplace_back(obj);
@@ -602,23 +624,10 @@ ObjectFile<E> *read_lto_object(Context<E> &ctx, MappedFile<Context<E>> *mf) {
   obj->first_global = 1;
   obj->is_lto_obj = true;
   obj->mf = mf;
+  obj->archive_name = mf->parent ? mf->parent->name : "";
 
   // Create plugin's object instance
-  PluginInputFile file = {};
-
-  MappedFile<Context<E>> *mf2 = mf->parent ? mf->parent : mf;
-  file.name = save_string(ctx, mf2->name).data();
-  if (mf2->fd == -1)
-    mf2->fd = open(file.name, O_RDONLY);
-  file.fd = mf2->fd;
-  if (file.fd == -1)
-    Fatal(ctx) << "cannot open " << file.name << ": " << errno_string();
-
-  if (mf->parent)
-    obj->archive_name = mf->parent->name;
-
-  file.offset = mf->get_offset();
-  file.filesize = mf->size;
+  PluginInputFile file = create_plugin_input_file(ctx, mf);
   file.handle = (void *)obj;
 
   LOG << "read_lto_symbols: "<< mf->name << "\n";
@@ -635,40 +644,34 @@ ObjectFile<E> *read_lto_object(Context<E> &ctx, MappedFile<Context<E>> *mf) {
   // LLVM needs it and takes the ownership of fd. To prevent "too many
   // open files" issue, we close fd only for GCC. This is ugly, though.
   if (!is_llvm(ctx)) {
+    MappedFile<Context<E>> *mf2 = mf->parent ? mf->parent : mf;
     close(mf2->fd);
     mf2->fd = -1;
   }
 
-  // Initialize object symbols
-  std::vector<ElfSym<E>> *esyms = new std::vector<ElfSym<E>>(1);
-  obj->has_symver.resize(plugin_symbols.size());
-  obj->lto_symbol_versions.resize(plugin_symbols.size());
+  // Create a symbol strtab
+  i64 strtab_size = 1;
+  for (PluginSymbol &psym : plugin_symbols)
+    strtab_size += strlen(psym.name) + 1;
+  std::string strtab(strtab_size, '\0');
+
+  // Initialize esyms
+  obj->lto_elf_syms.resize(plugin_symbols.size() + 1);
+  i64 strtab_offset = 1;
 
   for (i64 i = 0; i < plugin_symbols.size(); i++) {
     PluginSymbol &psym = plugin_symbols[i];
-    esyms->push_back(to_elf_sym<E>(psym));
+    obj->lto_elf_syms[i + 1] = to_elf_sym<E>(psym);
+    obj->lto_elf_syms[i + 1].st_name = strtab_offset;
 
-    std::string_view key = save_string(ctx, psym.name);
-    std::string_view name = key;
-
-    // Parse symbol version after atsign
-    if (i64 pos = name.find('@'); pos != name.npos) {
-      std::string_view ver = name.substr(pos);
-      name = name.substr(0, pos);
-
-      if (ver != "@" && ver != "@@") {
-        if (ver.starts_with("@@"))
-          key = name;
-        obj->has_symver.set(i);
-        obj->lto_symbol_versions[i] = ver.substr(1);
-      }
-    }
-
-    obj->symbols.push_back(get_symbol(ctx, key, name));
+    i64 len = strlen(psym.name);
+    memcpy(strtab.data() + strtab_offset, psym.name, len);
+    strtab_offset += len + 1;
   }
 
-  obj->elf_syms = *esyms;
-  obj->has_symver.resize(esyms->size());
+  obj->symbol_strtab = save_string(ctx, strtab);
+  obj->elf_syms = obj->lto_elf_syms;
+  obj->initialize_symbols(ctx);
   plugin_symbols.clear();
   return obj;
 }
@@ -677,6 +680,7 @@ ObjectFile<E> *read_lto_object(Context<E> &ctx, MappedFile<Context<E>> *mf) {
 template <typename E>
 std::vector<ObjectFile<E> *> do_lto(Context<E> &ctx) {
   Timer t(ctx, "do_lto");
+  load_lto_plugin(ctx);
 
   if (!ctx.arg.lto_pass2 && !supports_v3_api(ctx))
     restart_process(ctx);
@@ -709,8 +713,21 @@ std::vector<ObjectFile<E> *> do_lto(Context<E> &ctx) {
     get_symbol(ctx, y)->referenced_by_regular_obj = true;
   }
 
-  // Handle --entry
-  get_symbol(ctx, ctx.arg.entry)->referenced_by_regular_obj = true;
+  // Keep some symbols
+  for (Symbol<E> *sym : ctx.arg.undefined)
+    sym->referenced_by_regular_obj = true;
+
+  // Object files containing .gnu.offload_lto_.* sections need to be
+  // given to the LTO backend. Such sections contains code and data for
+  // peripherails (typically GPUs).
+  for (ObjectFile<E> *file : ctx.objs) {
+    if (!file->is_lto_obj && file->is_gcc_offload_obj) {
+      PluginInputFile pfile = create_plugin_input_file(ctx, file->mf);
+      int claimed = false;
+      claim_file_hook(&pfile, &claimed);
+      assert(!claimed);
+    }
+  }
 
   // all_symbols_read_hook() calls add_input_file() and add_input_library()
   LOG << "all symbols read\n";
@@ -723,7 +740,6 @@ std::vector<ObjectFile<E> *> do_lto(Context<E> &ctx) {
 template <typename E>
 void lto_cleanup(Context<E> &ctx) {
   Timer t(ctx, "lto_cleanup");
-
   if (cleanup_hook)
     cleanup_hook();
 }

elf/main.cc

@@ -17,7 +17,7 @@
 
 #ifdef _WIN32
 # include <direct.h>
-# define _chdir chdir
+# define chdir _chdir
 #else
 # include <unistd.h>
 #endif
@@ -139,7 +139,6 @@ static ObjectFile<E> *new_lto_obj(Context<E> &ctx, MappedFile<Context<E>> *mf,
   file->archive_name = archive_name;
   file->is_in_lib = ctx.in_lib || (!archive_name.empty() && !ctx.whole_archive);
   file->is_alive = !file->is_in_lib;
-  ctx.has_lto_object = true;
   if (ctx.arg.trace)
     SyncOut(ctx) << "trace: " << *file;
   return file;
@@ -299,22 +298,6 @@ static void read_input_files(Context<E> &ctx, std::span<std::string> args) {
       if (!mf)
         Fatal(ctx) << "--version-script: file not found: " << arg;
       parse_version_script(ctx, mf);
-    } else if (remove_prefix(arg, "--dynamic-list=")) {
-      MappedFile<Context<E>> *mf = find_from_search_paths(ctx, std::string(arg));
-      if (!mf)
-        Fatal(ctx) << "--dynamic-list: file not found: " << arg;
-      parse_dynamic_list(ctx, mf);
-    } else if (remove_prefix(arg, "--export-dynamic-symbol=")) {
-      if (arg == "*")
-        ctx.default_version = VER_NDX_GLOBAL;
-      else
-        ctx.version_patterns.push_back({arg, "--export-dynamic-symbol",
-                                        "global", VER_NDX_GLOBAL, false});
-    } else if (remove_prefix(arg, "--export-dynamic-symbol-list=")) {
-      MappedFile<Context<E>> *mf = find_from_search_paths(ctx, std::string(arg));
-      if (!mf)
-        Fatal(ctx) << "--export-dynamic-symbol-list: file not found: " << arg;
-      parse_dynamic_list(ctx, mf);
     } else if (arg == "--push-state") {
       state.push_back({ctx.as_needed, ctx.whole_archive, ctx.is_static,
                        ctx.in_lib});
@@ -457,7 +440,7 @@ int elf_main(int argc, char **argv) {
   compute_import_export(ctx);
 
   // Set "address-taken" bits for input sections.
-  if (ctx.arg.icf || ctx.arg.z_rewrite_endbr)
+  if (ctx.arg.icf)
     compute_address_significance(ctx);
 
   // Garbage-collect unreachable sections.
@@ -523,9 +506,9 @@ int elf_main(int argc, char **argv) {
     write_repro_file(ctx);
 
   // Handle --require-defined
-  for (std::string_view name : ctx.arg.require_defined)
-    if (!get_symbol(ctx, name)->file)
-      Error(ctx) << "--require-defined: undefined symbol: " << name;
+  for (Symbol<E> *sym : ctx.arg.require_defined)
+    if (!sym->file)
+      Error(ctx) << "--require-defined: undefined symbol: " << *sym;
 
   // .init_array and .fini_array contents have to be sorted by
   // a special rule. Sort them.
@@ -535,6 +518,11 @@ int elf_main(int argc, char **argv) {
   // because they are superceded by .init_array/.fini_array, though.
   sort_ctor_dtor(ctx);
 
+  // If .ctors/.dtors are to be placed to .init_array/.fini_array,
+  // we need to reverse their contents.
+  if (ctx.has_init_array && ctx.has_ctors)
+    fixup_ctors_in_init_array(ctx);
+
   // Handle --shuffle-sections
   if (ctx.arg.shuffle_sections != SHUFFLE_SECTIONS_NONE)
     shuffle_sections(ctx);
@@ -558,6 +546,9 @@ int elf_main(int argc, char **argv) {
   // .got.plt, .dynsym, .dynstr, etc.
   scan_relocations(ctx);
 
+  // Compute the is_weak bit for each imported symbol.
+  compute_imported_symbol_weakness(ctx);
+
   // Compute sizes of output sections while assigning offsets
   // within an output section to input sections.
   compute_section_sizes(ctx);
@@ -642,6 +633,9 @@ int elf_main(int argc, char **argv) {
   // Copy input sections to the output file and apply relocations.
   copy_chunks(ctx);
 
+  if (ctx.arg.z_rewrite_endbr)
+    rewrite_endbr(ctx);
+
   // Dynamic linker works better with sorted .rela.dyn section,
   // so we sort them.
   ctx.reldyn->sort(ctx);
@@ -671,7 +665,7 @@ int elf_main(int argc, char **argv) {
   if (!ctx.arg.dependency_file.empty())
     write_dependency_file(ctx);
 
-  if (ctx.has_lto_object)
+  if (!ctx.arg.plugin.empty())
     lto_cleanup(ctx);
 
   t_all.stop();

elf/mold-wrapper.c

@@ -132,3 +132,14 @@ int posix_spawn(pid_t *pid, const char *path,
   typeof(posix_spawn) *real = dlsym(RTLD_NEXT, "posix_spawn");
   return real(pid, path, file_actions, attrp, argv, envp);
 }
+
+int posix_spawnp(pid_t *pid, const char *file,
+		 const posix_spawn_file_actions_t *file_actions,
+		 const posix_spawnattr_t *attrp,
+		 char *const *argv, char *const *envp) {
+  debug_print("posix_spawnp %s\n", file);
+  if (is_ld(file))
+    file = get_mold_path();
+  typeof(posix_spawnp) *real = dlsym(RTLD_NEXT, "posix_spawnp");
+  return real(pid, file, file_actions, attrp, argv, envp);
+}

elf/mold.h

@@ -95,12 +95,12 @@ struct SymbolAux<PPC64V1> : SymbolAux<X86_64> {
 //
 
 template <typename E>
-class RangeExtensionThunk {};
+class Thunk {};
 
 template <needs_thunk E>
-class RangeExtensionThunk<E> {
+class Thunk<E> {
 public:
-  RangeExtensionThunk(OutputSection<E> &osec, i64 offset)
+  Thunk(OutputSection<E> &osec, i64 offset)
     : output_section(osec), offset(offset) {}
 
   i64 size() const { return E::thunk_hdr_size + symbols.size() * E::thunk_size; }
@@ -119,7 +119,7 @@ public:
   std::vector<Symbol<E> *> symbols;
 };
 
-struct RangeExtensionRef {
+struct ThunkRef {
   i16 thunk_idx = -1;
   i16 sym_idx = -1;
 };
@@ -212,7 +212,7 @@ struct InputSectionExtras {};
 
 template <needs_thunk E>
 struct InputSectionExtras<E> {
-  std::vector<RangeExtensionRef> range_extn;
+  std::vector<ThunkRef> thunk_refs;
 };
 
 template <is_riscv E>
@@ -449,7 +449,11 @@ public:
 template <typename E>
 class OutputSection : public Chunk<E> {
 public:
-  OutputSection(Context<E> &ctx, std::string_view name, u32 type, u64 flags);
+  OutputSection(std::string_view name, u32 type) {
+    this->name = name;
+    this->shdr.sh_type = type;
+  }
+
   ChunkKind kind() override { return OUTPUT_SECTION; }
   OutputSection<E> *to_osec() override { return this; }
   void construct_relr(Context<E> &ctx) override;
@@ -462,8 +466,9 @@ public:
   void create_range_extension_thunks(Context<E> &ctx);
 
   std::vector<InputSection<E> *> members;
-  std::vector<std::unique_ptr<RangeExtensionThunk<E>>> thunks;
+  std::vector<std::unique_ptr<Thunk<E>>> thunks;
   std::unique_ptr<RelocSection<E>> reloc_sec;
+  Atomic<u32> sh_flags;
 };
 
 template <typename E>
@@ -768,7 +773,7 @@ class MergedSection : public Chunk<E> {
 public:
   static MergedSection<E> *
   get_instance(Context<E> &ctx, std::string_view name, i64 type, i64 flags,
-               i64 entsize);
+               i64 entsize, i64 addralign);
 
   SectionFragment<E> *insert(Context<E> &ctx, std::string_view data,
                              u64 hash, i64 p2align);
@@ -1160,6 +1165,7 @@ public:
                                std::string archive_name, bool is_in_lib);
 
   void parse(Context<E> &ctx);
+  void initialize_symbols(Context<E> &ctx);
   void initialize_mergeable_sections(Context<E> &ctx);
   void resolve_section_pieces(Context<E> &ctx);
   void resolve_symbols(Context<E> &ctx) override;
@@ -1183,11 +1189,13 @@ public:
   std::vector<FdeRecord<E>> fdes;
   BitVector has_symver;
   std::vector<ComdatGroupRef<E>> comdat_groups;
-  InputSection<E> *eh_frame_section = nullptr;
+  std::vector<InputSection<E> *> eh_frame_sections;
   bool exclude_libs = false;
   std::map<u32, u32> gnu_properties;
-  bool is_lto_obj = false;
   bool needs_executable_stack = false;
+  bool is_lto_obj = false;
+  bool is_gcc_offload_obj = false;
+  bool is_rust_obj = false;
 
   u64 num_dynrel = 0;
   u64 reldyn_offset = 0;
@@ -1205,7 +1213,7 @@ public:
   InputSection<E> *debug_pubtypes = nullptr;
 
   // For LTO
-  std::vector<std::string_view> lto_symbol_versions;
+  std::vector<ElfSym<E>> lto_elf_syms;
 
   // Target-specific member
   [[no_unique_address]] ObjectFileExtras<E> extra;
@@ -1215,7 +1223,6 @@ private:
              std::string archive_name, bool is_in_lib);
 
   void initialize_sections(Context<E> &ctx);
-  void initialize_symbols(Context<E> &ctx);
   void sort_relocations(Context<E> &ctx);
   void initialize_ehframe_sections(Context<E> &ctx);
   void parse_note_gnu_property(Context <E> &ctx, const ElfShdr <E> &shdr);
@@ -1281,8 +1288,15 @@ get_script_output_type(Context<E> &ctx, MappedFile<Context<E>> *mf);
 template <typename E>
 void parse_version_script(Context<E> &ctx, MappedFile<Context<E>> *mf);
 
+struct DynamicPattern {
+  std::string_view pattern;
+  std::string_view source;
+  bool is_cpp = false;
+};
+
 template <typename E>
-void parse_dynamic_list(Context<E> &ctx, MappedFile<Context<E>> *mf);
+std::vector<DynamicPattern>
+parse_dynamic_list(Context<E> &ctx, std::string_view path);
 
 //
 // lto.cc
@@ -1372,16 +1386,19 @@ template <typename E> void check_duplicate_symbols(Context<E> &);
 template <typename E> void check_symbol_types(Context<E> &);
 template <typename E> void sort_init_fini(Context<E> &);
 template <typename E> void sort_ctor_dtor(Context<E> &);
+template <typename E> void fixup_ctors_in_init_array(Context<E> &);
 template <typename E> void shuffle_sections(Context<E> &);
 template <typename E> void compute_section_sizes(Context<E> &);
 template <typename E> void sort_output_sections(Context<E> &);
 template <typename E> void claim_unresolved_symbols(Context<E> &);
 template <typename E> void scan_relocations(Context<E> &);
+template <typename E> void compute_imported_symbol_weakness(Context<E> &);
 template <typename E> void construct_relr(Context<E> &);
 template <typename E> void create_output_symtab(Context<E> &);
 template <typename E> void report_undef_errors(Context<E> &);
 template <typename E> void create_reloc_sections(Context<E> &);
 template <typename E> void copy_chunks(Context<E> &);
+template <typename E> void rewrite_endbr(Context<E> &);
 template <typename E> void apply_version_script(Context<E> &);
 template <typename E> void parse_symbol_version(Context<E> &);
 template <typename E> void compute_import_export(Context<E> &);
@@ -1454,6 +1471,22 @@ public:
 // arch-ppc64v2.cc
 //
 
+extern const std::vector<std::pair<std::string_view, u32>>
+ppc64_save_restore_insns;
+
+class PPC64SaveRestoreSection : public Chunk<PPC64V2> {
+public:
+  PPC64SaveRestoreSection() {
+    this->name = ".save_restore_gprs";
+    this->shdr.sh_type = SHT_PROGBITS;
+    this->shdr.sh_flags = SHF_ALLOC | SHF_EXECINSTR;
+    this->shdr.sh_addralign = 16;
+    this->shdr.sh_size = ppc64_save_restore_insns.size() * 4;
+  }
+
+  void copy_buf(Context<PPC64V2> &ctx) override;
+};
+
 template <> u64 get_eflags(Context<PPC64V2> &ctx);
 
 //
@@ -1578,6 +1611,7 @@ struct ContextExtras<PPC64V1> {
 
 template <>
 struct ContextExtras<PPC64V2> {
+  PPC64SaveRestoreSection *save_restore = nullptr;
   Symbol<PPC64V2> *TOC = nullptr;
   Atomic<bool> is_power10 = false;
 };
@@ -1599,7 +1633,12 @@ struct ContextExtras<ALPHA> {
 // resource management, and other miscellaneous objects.
 template <typename E>
 struct Context {
-  Context() = default;
+  Context() {
+    arg.entry = get_symbol(*this, "_start");
+    arg.fini = get_symbol(*this, "_fini");
+    arg.init = get_symbol(*this, "_init");
+  }
+
   Context(const Context<E> &) = delete;
 
   void checkpoint() {
@@ -1616,6 +1655,9 @@ struct Context {
     CompressKind compress_debug_sections = COMPRESS_NONE;
     SeparateCodeKind z_separate_code = NOSEPARATE_CODE;
     ShuffleSectionsKind shuffle_sections = SHUFFLE_SECTIONS_NONE;
+    Symbol<E> *entry = nullptr;
+    Symbol<E> *fini = nullptr;
+    Symbol<E> *init = nullptr;
     UnresolvedKind unresolved_symbols = UNRESOLVED_ERROR;
     bool Bsymbolic = false;
     bool Bsymbolic_functions = false;
@@ -1642,6 +1684,7 @@ struct Context {
     bool ignore_data_address_equality = false;
     bool is_static = false;
     bool lto_pass2 = false;
+    bool nmagic = false;
     bool noinhibit_exec = false;
     bool oformat_binary = false;
     bool omagic = false;
@@ -1692,6 +1735,7 @@ struct Context {
     bool z_text = false;
     i64 filler = -1;
     i64 spare_dynamic_tags = 5;
+    i64 spare_program_headers = 0;
     i64 thread_count = 0;
     i64 z_stack_size = 0;
     u64 shuffle_sections_seed;
@@ -1703,9 +1747,6 @@ struct Context {
     std::string dependency_file;
     std::string directory;
     std::string dynamic_linker;
-    std::string entry = "_start";
-    std::string fini = "_fini";
-    std::string init = "_init";
     std::string output = "a.out";
     std::string package_metadata;
     std::string plugin;
@@ -1718,6 +1759,8 @@ struct Context {
     std::unordered_set<std::string_view> ignore_ir_file;
     std::unordered_set<std::string_view> wrap;
     std::vector<SectionOrder> section_order;
+    std::vector<Symbol<E> *> require_defined;
+    std::vector<Symbol<E> *> undefined;
     std::vector<std::pair<Symbol<E> *, std::variant<Symbol<E> *, u64>>> defsyms;
     std::vector<std::string> library_paths;
     std::vector<std::string> plugin_opt;
@@ -1725,31 +1768,29 @@ struct Context {
     std::vector<std::string_view> auxiliary;
     std::vector<std::string_view> exclude_libs;
     std::vector<std::string_view> filter;
-    std::vector<std::string_view> require_defined;
     std::vector<std::string_view> trace_symbol;
-    std::vector<std::string_view> undefined;
     u64 image_base = 0x200000;
   } arg;
 
   std::vector<VersionPattern> version_patterns;
-  u16 default_version = VER_NDX_GLOBAL;
+  std::vector<DynamicPattern> dynamic_list_patterns;
+  i64 default_version = VER_NDX_UNSPECIFIED;
   i64 page_size = E::page_size;
   std::optional<int> global_lock_fd;
 
-  // true if default_version is set by a wildcard in version script.
-  bool default_version_from_version_script = false;
-
   // Reader context
   bool as_needed = false;
   bool whole_archive = false;
   bool is_static;
   bool in_lib = false;
   i64 file_priority = 10000;
+  MappedFile<Context<E>> *script_file = nullptr;
   std::unordered_set<std::string_view> visited;
   tbb::task_group tg;
 
   bool has_error = false;
-  bool has_lto_object = false;
+  Atomic<bool> has_init_array = false;
+  Atomic<bool> has_ctors = false;
 
   // Symbol table
   tbb::concurrent_hash_map<std::string_view, Symbol<E>, HashCmp> symbol_map;
@@ -1789,7 +1830,7 @@ struct Context {
   Atomic<bool> has_textrel = false;
   Atomic<u32> num_ifunc_dynrels = 0;
 
-  tbb::concurrent_hash_map<std::string_view, std::vector<std::string>> undef_errors;
+  tbb::concurrent_hash_map<Symbol<E> *, std::vector<std::string>> undef_errors;
 
   // Output chunks
   OutputEhdr<E> *ehdr = nullptr;
@@ -2016,6 +2057,10 @@ public:
     TAG_MASK = 0b11,
   };
 
+  static_assert(alignof(InputSection<E>) >= 4);
+  static_assert(alignof(Chunk<E>) >= 4);
+  static_assert(alignof(SectionFragment<E>) >= 4);
+
   uintptr_t origin = 0;
 
   // `value` contains symbol value. If it's an absolute symbol, it is
@@ -2031,7 +2076,7 @@ public:
   i32 sym_idx = -1;
 
   i32 aux_idx = -1;
-  u16 ver_idx = 0;
+  u16 ver_idx = VER_NDX_UNSPECIFIED;
 
   // `flags` has NEEDS_ flags.
   Atomic<u8> flags = 0;
@@ -2152,30 +2197,27 @@ public:
   // opposed to IR object).
   bool referenced_by_regular_obj : 1 = false;
 
+  // For `-z rewrite-endbr`
+  bool address_taken : 1 = false;
+
   // Target-dependent extra members.
   [[no_unique_address]] SymbolExtras<E> extra;
 };
 
-// If we haven't seen the same `key` before, create a new instance
-// of Symbol and returns it. Otherwise, returns the previously-
-// instantiated object. `key` is usually the same as `name`.
 template <typename E>
 Symbol<E> *get_symbol(Context<E> &ctx, std::string_view key,
-                      std::string_view name) {
-  typename decltype(ctx.symbol_map)::const_accessor acc;
-  ctx.symbol_map.insert(acc, {key, Symbol<E>(name)});
-  return const_cast<Symbol<E> *>(&acc->second);
-}
+                      std::string_view name);
 
 template <typename E>
-Symbol<E> *get_symbol(Context<E> &ctx, std::string_view name) {
-  return get_symbol(ctx, name, name);
-}
+Symbol<E> *get_symbol(Context<E> &ctx, std::string_view name);
+
+template <typename E>
+std::string_view demangle(const Symbol<E> &sym);
 
 template <typename E>
 std::ostream &operator<<(std::ostream &out, const Symbol<E> &sym) {
   if (opt_demangle)
-    out << demangle(sym.name());
+    out << demangle(sym);
   else
     out << sym.name();
   return out;
@@ -2232,7 +2274,7 @@ inline u64 InputSection<E>::get_addr() const {
 template <typename E>
 inline std::string_view InputSection<E>::name() const {
   if (file.elf_sections.size() <= shndx)
-    return ".common";
+    return (shdr().sh_flags & SHF_TLS) ? ".tls_common" : ".common";
   return file.shstrtab.data() + file.elf_sections[shndx].sh_name;
 }
 
@@ -2299,7 +2341,7 @@ InputSection<E>::get_fragment(Context<E> &ctx, const ElfRel<E> &rel) {
 template <typename E>
 u64 InputSection<E>::get_thunk_addr(i64 idx) {
   if constexpr (needs_thunk<E>) {
-    RangeExtensionRef ref = extra.range_extn[idx];
+    ThunkRef ref = extra.thunk_refs[idx];
     assert(ref.thunk_idx != -1);
     return output_section->thunks[ref.thunk_idx]->get_addr(ref.sym_idx);
   }
@@ -2397,8 +2439,6 @@ InputFile<E>::get_string(Context<E> &ctx, const ElfShdr<E> &shdr) {
 
 template <typename E>
 inline std::string_view InputFile<E>::get_string(Context<E> &ctx, i64 idx) {
-  assert(idx < elf_sections.size());
-
   if (elf_sections.size() <= idx)
     Fatal(ctx) << *this << ": invalid section index: " << idx;
   return this->get_string(ctx, elf_sections[idx]);
@@ -2710,9 +2750,6 @@ inline bool Symbol<E>::has_plt(Context<E> &ctx) const {
 
 template <typename E>
 inline bool Symbol<E>::is_absolute() const {
-  if (file && file->is_dso)
-    return esym().is_abs();
-
   return !is_imported && !get_frag() && !get_input_section() &&
          !get_output_section();
 }

elf/output-chunks.cc

@@ -50,10 +50,9 @@ void OutputEhdr<E>::copy_buf(Context<E> &ctx) {
     if (ctx.arg.relocatable)
       return 0;
 
-    if (!ctx.arg.entry.empty())
-      if (Symbol<E> *sym = get_symbol(ctx, ctx.arg.entry);
-          sym->file && !sym->file->is_dso)
-        return sym->get_addr(ctx);
+    if (Symbol<E> &sym = *ctx.arg.entry;
+        sym.file && !sym.file->is_dso)
+      return sym.get_addr(ctx);
 
     if (OutputSection<E> *osec = find_section(ctx, ".text"))
       return osec->shdr.sh_addr;
@@ -149,11 +148,11 @@ template <typename E>
 static std::vector<ElfPhdr<E>> create_phdr(Context<E> &ctx) {
   std::vector<ElfPhdr<E>> vec;
 
-  auto define = [&](u64 type, u64 flags, i64 min_align, Chunk<E> *chunk) {
+  auto define = [&](u64 type, u64 flags, Chunk<E> *chunk) {
     ElfPhdr<E> phdr = {};
     phdr.p_type = type;
     phdr.p_flags = flags;
-    phdr.p_align = std::max<u64>(min_align, chunk->shdr.sh_addralign);
+    phdr.p_align = chunk->shdr.sh_addralign;
     phdr.p_offset = chunk->shdr.sh_offset;
 
     if (chunk->shdr.sh_type != SHT_NOBITS)
@@ -176,8 +175,7 @@ static std::vector<ElfPhdr<E>> create_phdr(Context<E> &ctx) {
   };
 
   auto is_bss = [](Chunk<E> *chunk) {
-    return chunk->shdr.sh_type == SHT_NOBITS &&
-           !(chunk->shdr.sh_flags & SHF_TLS);
+    return chunk->shdr.sh_type == SHT_NOBITS;
   };
 
   auto is_tbss = [](Chunk<E> *chunk) {
@@ -186,86 +184,86 @@ static std::vector<ElfPhdr<E>> create_phdr(Context<E> &ctx) {
   };
 
   auto is_note = [](Chunk<E> *chunk) {
-    ElfShdr<E> &shdr = chunk->shdr;
-    return (shdr.sh_type == SHT_NOTE) && (shdr.sh_flags & SHF_ALLOC);
+    return chunk->shdr.sh_type == SHT_NOTE;
   };
 
+  // When we are creating PT_LOAD segments, we consider only
+  // the following chunks.
+  std::vector<Chunk<E> *> chunks;
+  for (Chunk<E> *chunk : ctx.chunks)
+    if ((chunk->shdr.sh_flags & SHF_ALLOC) && !is_tbss(chunk))
+      chunks.push_back(chunk);
+
+  // The ELF spec says that "loadable segment entries in the program
+  // header table appear in ascending order, sorted on the p_vaddr
+  // member".
+  sort(chunks, [](Chunk<E> *a, Chunk<E> *b) {
+    return a->shdr.sh_addr < b->shdr.sh_addr;
+  });
+
   // Create a PT_PHDR for the program header itself.
   if (ctx.phdr && (ctx.phdr->shdr.sh_flags & SHF_ALLOC))
-    define(PT_PHDR, PF_R, sizeof(Word<E>), ctx.phdr);
+    define(PT_PHDR, PF_R, ctx.phdr);
 
   // Create a PT_INTERP.
   if (ctx.interp)
-    define(PT_INTERP, PF_R, 1, ctx.interp);
+    define(PT_INTERP, PF_R, ctx.interp);
 
   // Create a PT_NOTE for SHF_NOTE sections.
-  for (i64 i = 0, end = ctx.chunks.size(); i < end;) {
-    Chunk<E> *first = ctx.chunks[i++];
-    if (!is_note(first))
-      continue;
+  for (i64 i = 0; i < chunks.size();) {
+    Chunk<E> *first = chunks[i++];
+    if (is_note(first)) {
+      i64 flags = to_phdr_flags(ctx, first);
+      define(PT_NOTE, flags, first);
 
-    i64 flags = to_phdr_flags(ctx, first);
-    i64 alignment = first->shdr.sh_addralign;
-    define(PT_NOTE, flags, alignment, first);
-
-    while (i < end && is_note(ctx.chunks[i]) &&
-           to_phdr_flags(ctx, ctx.chunks[i]) == flags)
-      append(ctx.chunks[i++]);
+      while (i < chunks.size() &&
+             is_note(ctx.chunks[i]) &&
+             to_phdr_flags(ctx, ctx.chunks[i]) == flags)
+        append(ctx.chunks[i++]);
+    }
   }
 
   // Create PT_LOAD segments.
-  {
-    i64 idx = vec.size();
-    std::vector<Chunk<E> *> chunks = ctx.chunks;
-    std::erase_if(chunks, is_tbss);
+  for (i64 i = 0; i < chunks.size();) {
+    Chunk<E> *first = chunks[i++];
+    i64 flags = to_phdr_flags(ctx, first);
+    define(PT_LOAD, flags, first);
+    vec.back().p_align = std::max<u64>(ctx.page_size, vec.back().p_align);
 
-    for (i64 i = 0, end = chunks.size(); i < end;) {
-      Chunk<E> *first = chunks[i++];
-      if (!(first->shdr.sh_flags & SHF_ALLOC))
-        continue;
-
-      i64 flags = to_phdr_flags(ctx, first);
-      define(PT_LOAD, flags, ctx.page_size, first);
-
-      // Add contiguous ALLOC sections as long as they have the same
-      // section flags and there's no on-disk gap in between.
-      if (!is_bss(first))
-        while (i < end && !is_bss(chunks[i]) &&
-               to_phdr_flags(ctx, chunks[i]) == flags &&
-               chunks[i]->shdr.sh_offset - first->shdr.sh_offset ==
-               chunks[i]->shdr.sh_addr - first->shdr.sh_addr)
-          append(chunks[i++]);
-
-      while (i < end && is_bss(chunks[i]) &&
-             to_phdr_flags(ctx, chunks[i]) == flags)
+    // Add contiguous ALLOC sections as long as they have the same
+    // section flags and there's no on-disk gap in between.
+    if (!is_bss(first))
+      while (i < chunks.size() &&
+             !is_bss(chunks[i]) &&
+             to_phdr_flags(ctx, chunks[i]) == flags &&
+             chunks[i]->shdr.sh_offset - first->shdr.sh_offset ==
+             chunks[i]->shdr.sh_addr - first->shdr.sh_addr)
         append(chunks[i++]);
-    }
 
-    // The ELF spec says that "loadable segment entries in the program
-    // header table appear in ascending order, sorted on the p_vaddr
-    // member".
-    std::stable_sort(vec.begin() + idx, vec.end(),
-                     [](const ElfPhdr<E> &a, const ElfPhdr<E> &b) {
-      return a.p_vaddr < b.p_vaddr;
-    });
+    while (i < chunks.size() &&
+           is_bss(chunks[i]) &&
+           to_phdr_flags(ctx, chunks[i]) == flags)
+      append(chunks[i++]);
   }
 
   // Create a PT_TLS.
-  for (i64 i = 0; i < ctx.chunks.size(); i++) {
-    if (ctx.chunks[i]->shdr.sh_flags & SHF_TLS) {
-      define(PT_TLS, PF_R, 1, ctx.chunks[i++]);
-      while (i < ctx.chunks.size() && (ctx.chunks[i]->shdr.sh_flags & SHF_TLS))
+  for (i64 i = 0; i < ctx.chunks.size();) {
+    Chunk<E> *first = ctx.chunks[i++];
+    if (first->shdr.sh_flags & SHF_TLS) {
+      define(PT_TLS, PF_R, first);
+      while (i < ctx.chunks.size() &&
+             (ctx.chunks[i]->shdr.sh_flags & SHF_TLS))
         append(ctx.chunks[i++]);
     }
   }
 
   // Add PT_DYNAMIC
   if (ctx.dynamic && ctx.dynamic->shdr.sh_size)
-    define(PT_DYNAMIC, PF_R | PF_W, 1, ctx.dynamic);
+    define(PT_DYNAMIC, PF_R | PF_W, ctx.dynamic);
 
   // Add PT_GNU_EH_FRAME
   if (ctx.eh_frame_hdr)
-    define(PT_GNU_EH_FRAME, PF_R, 1, ctx.eh_frame_hdr);
+    define(PT_GNU_EH_FRAME, PF_R, ctx.eh_frame_hdr);
 
   // Add PT_GNU_STACK, which is a marker segment that doesn't really
   // contain any segments. It controls executable bit of stack area.
@@ -280,31 +278,31 @@ static std::vector<ElfPhdr<E>> create_phdr(Context<E> &ctx) {
 
   // Create a PT_GNU_RELRO.
   if (ctx.arg.z_relro) {
-    for (i64 i = 0; i < ctx.chunks.size(); i++) {
-      if (!ctx.chunks[i]->is_relro)
-        continue;
-
-      define(PT_GNU_RELRO, PF_R, 1, ctx.chunks[i++]);
-      while (i < ctx.chunks.size() && ctx.chunks[i]->is_relro)
-        append(ctx.chunks[i++]);
-      vec.back().p_align = 1;
+    for (i64 i = 0; i < chunks.size();) {
+      Chunk<E> *first = chunks[i++];
+      if (first->is_relro) {
+        define(PT_GNU_RELRO, PF_R, first);
+        while (i < chunks.size() && chunks[i]->is_relro)
+          append(chunks[i++]);
+        vec.back().p_align = 1;
+      }
     }
   }
 
   // Create a PT_ARM_EDXIDX
   if constexpr (is_arm32<E>)
     if (OutputSection<E> *osec = find_section(ctx, SHT_ARM_EXIDX))
-      define(PT_ARM_EXIDX, PF_R, 4, osec);
+      define(PT_ARM_EXIDX, PF_R, osec);
 
   // Create a PT_RISCV_ATTRIBUTES
   if constexpr (is_riscv<E>)
     if (ctx.extra.riscv_attributes->shdr.sh_size)
-      define(PT_RISCV_ATTRIBUTES, PF_R, 1, ctx.extra.riscv_attributes);
+      define(PT_RISCV_ATTRIBUTES, PF_R, ctx.extra.riscv_attributes);
 
   // Create a PT_OPENBSD_RANDOMIZE
   for (Chunk<E> *chunk : ctx.chunks)
     if (chunk->name == ".openbsd.randomdata")
-      define(PT_OPENBSD_RANDOMIZE, PF_R | PF_W, 1, chunk);
+      define(PT_OPENBSD_RANDOMIZE, PF_R | PF_W, chunk);
 
   // Set p_paddr if --physical-image-base was given. --physical-image-base
   // is typically used in embedded programming to specify the base address
@@ -352,6 +350,7 @@ static std::vector<ElfPhdr<E>> create_phdr(Context<E> &ctx) {
     }
   }
 
+  vec.resize(vec.size() + ctx.arg.spare_program_headers);
   return vec;
 }
 
@@ -763,13 +762,13 @@ static std::vector<Word<E>> create_dynamic_section(Context<E> &ctx) {
     define(DT_VERDEFNUM, ctx.verdef->shdr.sh_info);
   }
 
-  if (Symbol<E> *sym = get_symbol(ctx, ctx.arg.init);
-      sym->file && !sym->file->is_dso)
-    define(DT_INIT, sym->get_addr(ctx));
+  if (Symbol<E> &sym = *ctx.arg.init;
+      sym.file && !sym.file->is_dso)
+    define(DT_INIT, sym.get_addr(ctx));
 
-  if (Symbol<E> *sym = get_symbol(ctx, ctx.arg.fini);
-      sym->file && !sym->file->is_dso)
-    define(DT_FINI, sym->get_addr(ctx));
+  if (Symbol<E> &sym = *ctx.arg.fini;
+      sym.file && !sym.file->is_dso)
+    define(DT_FINI, sym.get_addr(ctx));
 
   if (ctx.hash)
     define(DT_HASH, ctx.hash->shdr.sh_addr);
@@ -860,36 +859,6 @@ void DynamicSection<E>::copy_buf(Context<E> &ctx) {
   write_vector(ctx.buf + this->shdr.sh_offset, contents);
 }
 
-template <typename E>
-OutputSection<E>::OutputSection(Context<E> &ctx, std::string_view name,
-                                u32 type, u64 flags) {
-  this->name = name;
-  this->shdr.sh_type = type;
-  this->shdr.sh_flags = flags & ~SHF_MERGE & ~SHF_STRINGS;
-
-  if (auto it = ctx.arg.section_align.find(name);
-      it != ctx.arg.section_align.end())
-    this->shdr.sh_addralign = it->second;
-
-  // PT_GNU_RELRO segment is a security mechanism to make more pages
-  // read-only than we could have done without it.
-  //
-  // Traditionally, sections are either read-only or read-write. If a
-  // section contains dynamic relocations, it must have been put into a
-  // read-write segment so that the program loader can mutate its
-  // contents in memory, even if no one will write to it at runtime.
-  //
-  // RELRO segment allows us to make such pages writable only when a
-  // program is being loaded. After that, the page becomes read-only.
-  //
-  // Some sections, such as .init, .fini, .got, .dynamic, contain
-  // dynamic relocations but doesn't have to be writable at runtime,
-  // so they are put into a RELRO segment.
-  this->is_relro = (name == ".toc" || name.ends_with(".rel.ro") ||
-                    type == SHT_INIT_ARRAY || type == SHT_FINI_ARRAY ||
-                    type == SHT_PREINIT_ARRAY || (flags & SHF_TLS));
-}
-
 template <typename E>
 void OutputSection<E>::copy_buf(Context<E> &ctx) {
   if (this->shdr.sh_type != SHT_NOBITS)
@@ -925,8 +894,7 @@ void OutputSection<E>::write_to(Context<E> &ctx, u8 *buf) {
   });
 
   if constexpr (needs_thunk<E>) {
-    tbb::parallel_for_each(thunks,
-                           [&](std::unique_ptr<RangeExtensionThunk<E>> &thunk) {
+    tbb::parallel_for_each(thunks, [&](std::unique_ptr<Thunk<E>> &thunk) {
       thunk->copy_buf(ctx);
     });
   }
@@ -1019,7 +987,7 @@ void OutputSection<E>::compute_symtab_size(Context<E> &ctx) {
     this->strtab_size = 0;
     this->num_local_symtab = 0;
 
-    for (std::unique_ptr<RangeExtensionThunk<E>> &thunk : thunks) {
+    for (std::unique_ptr<Thunk<E>> &thunk : thunks) {
       // For ARM32, we emit additional symbol "$t", "$a" and "$d" for
       // each thunk to mark the beginning of Thumb code, ARM code and
       // data, respectively.
@@ -1058,7 +1026,7 @@ void OutputSection<E>::populate_symtab(Context<E> &ctx) {
       esym++;
     };
 
-    for (std::unique_ptr<RangeExtensionThunk<E>> &thunk : thunks) {
+    for (std::unique_ptr<Thunk<E>> &thunk : thunks) {
       for (i64 i = 0; i < thunk->symbols.size(); i++) {
         Symbol<E> &sym = *thunk->symbols[i];
         u64 addr = thunk->get_addr(i);
@@ -1912,11 +1880,23 @@ void GnuHashSection<E>::copy_buf(Context<E> &ctx) {
 
 template <typename E>
 std::string_view
-get_merged_output_name(Context<E> &ctx, std::string_view name, u64 flags) {
+get_merged_output_name(Context<E> &ctx, std::string_view name, u64 flags,
+                       i64 entsize, i64 addralign) {
   if (ctx.arg.relocatable && !ctx.arg.relocatable_merge_sections)
     return name;
   if (ctx.arg.unique && ctx.arg.unique->match(name))
     return name;
+
+  // GCC seems to create sections named ".rodata.strN.<mangled-symbol-name>.M".
+  // We want to eliminate the symbol name part from the section name.
+  if ((flags & SHF_STRINGS) && name.starts_with(".rodata.")) {
+    std::string name2 = ".rodata.str"s + std::to_string(entsize) +
+                        "." + std::to_string(addralign);
+    if (name == name2)
+      return name;
+    return save_string(ctx, name2);
+  }
+
   return name;
 }
 
@@ -1932,8 +1912,9 @@ MergedSection<E>::MergedSection(std::string_view name, i64 flags, i64 type,
 template <typename E>
 MergedSection<E> *
 MergedSection<E>::get_instance(Context<E> &ctx, std::string_view name,
-                               i64 type, i64 flags, i64 entsize) {
-  name = get_merged_output_name(ctx, name, flags);
+                               i64 type, i64 flags,
+                               i64 entsize, i64 addralign) {
+  name = get_merged_output_name(ctx, name, flags, entsize, addralign);
   flags = flags & ~(u64)SHF_GROUP & ~(u64)SHF_COMPRESSED;
 
   auto find = [&]() -> MergedSection * {
@@ -2534,8 +2515,12 @@ void VerdefSection<E>::construct(Context<E> &ctx) {
   for (std::string_view verstr : ctx.arg.version_definitions)
     write(verstr, idx++, 0);
 
-  for (Symbol<E> *sym : std::span<Symbol<E> *>(ctx.dynsym->symbols).subspan(1))
-    ctx.versym->contents[sym->get_dynsym_idx(ctx)] = sym->ver_idx;
+  for (Symbol<E> *sym : std::span<Symbol<E> *>(ctx.dynsym->symbols).subspan(1)) {
+    i64 ver = sym->ver_idx;
+    if (ver == VER_NDX_UNSPECIFIED)
+      ver = VER_NDX_GLOBAL;
+    ctx.versym->contents[sym->get_dynsym_idx(ctx)] = ver;
+  }
 }
 
 template <typename E>

elf/passes.cc

@@ -177,6 +177,9 @@ void create_synthetic_sections(Context<E> &ctx) {
   if constexpr (is_ppc64v1<E>)
     ctx.extra.opd = push(new PPC64OpdSection);
 
+  if constexpr (is_ppc64v2<E>)
+    ctx.extra.save_restore = push(new PPC64SaveRestoreSection);
+
   if constexpr (is_sparc<E>) {
     if (ctx.arg.is_static)
       ctx.extra.tls_get_addr_sec = push(new SparcTlsGetAddrSection);
@@ -189,15 +192,13 @@ void create_synthetic_sections(Context<E> &ctx) {
 
 template <typename E>
 static void mark_live_objects(Context<E> &ctx) {
-  auto mark_symbol = [&](std::string_view name) {
-    if (InputFile<E> *file = get_symbol(ctx, name)->file)
-      file->is_alive = true;
-  };
+  for (Symbol<E> *sym : ctx.arg.undefined)
+    if (sym->file)
+      sym->file->is_alive = true;
 
-  for (std::string_view name : ctx.arg.undefined)
-    mark_symbol(name);
-  for (std::string_view name : ctx.arg.require_defined)
-    mark_symbol(name);
+  for (Symbol<E> *sym : ctx.arg.require_defined)
+    if (sym->file)
+      sym->file->is_alive = true;
 
   std::vector<InputFile<E> *> roots;
 
@@ -302,7 +303,12 @@ void resolve_symbols(Context<E> &ctx) {
 
   do_resolve_symbols(ctx);
 
-  if (ctx.has_lto_object) {
+  bool has_lto_obj = false;
+  for (ObjectFile<E> *file : objs)
+    if (file->is_lto_obj || file->is_gcc_offload_obj)
+      has_lto_obj = true;
+
+  if (has_lto_obj) {
     // Do link-time optimization. We pass all IR object files to the
     // compiler backend to compile them into a few ELF object files.
     //
@@ -358,8 +364,8 @@ void kill_eh_frame_sections(Context<E> &ctx) {
   Timer t(ctx, "kill_eh_frame_sections");
 
   for (ObjectFile<E> *file : ctx.objs)
-    if (file->eh_frame_section)
-      file->eh_frame_section->is_alive = false;
+    for (InputSection<E> *sec : file->eh_frame_sections)
+      sec->is_alive = false;
 }
 
 template <typename E>
@@ -397,7 +403,7 @@ template <typename E>
 void add_comment_string(Context<E> &ctx, std::string str) {
   MergedSection<E> *sec =
     MergedSection<E>::get_instance(ctx, ".comment", SHT_PROGBITS,
-                                   SHF_MERGE | SHF_STRINGS, 1);
+                                   SHF_MERGE | SHF_STRINGS, 1, 1);
 
   std::string_view buf = save_string(ctx, str);
   std::string_view data(buf.data(), buf.size() + 1);
@@ -455,7 +461,6 @@ struct OutputSectionKey {
   bool operator==(const OutputSectionKey &) const = default;
   std::string_view name;
   u64 type;
-  u64 flags;
 };
 
 template <typename E>
@@ -513,17 +518,26 @@ get_output_name(Context<E> &ctx, std::string_view name, u64 flags) {
 template <typename E>
 static OutputSectionKey
 get_output_section_key(Context<E> &ctx, InputSection<E> &isec) {
+  // If .init_array/.fini_array exist, .ctors/.dtors must be merged
+  // with them.
+  //
+  // CRT object files contain .ctors/.dtors sections without any
+  // relocations. They contain sentinel values, 0 and -1, to mark the
+  // beginning and the end of the initializer/finalizer pointer arrays.
+  // We do not place them into .init_array/.fini_array because such
+  // invalid pointer values would simply make the program to crash.
+  if (ctx.has_init_array && !isec.get_rels(ctx).empty()) {
+    std::string_view name = isec.name();
+    if (name == ".ctors" || name.starts_with(".ctors."))
+      return {".init_array", SHT_INIT_ARRAY};
+    if (name == ".dtors" || name.starts_with(".dtors."))
+      return {".fini_array", SHT_FINI_ARRAY};
+  }
+
   const ElfShdr<E> &shdr = isec.shdr();
   std::string_view name = get_output_name(ctx, isec.name(), shdr.sh_flags);
   u64 type = canonicalize_type<E>(name, shdr.sh_type);
-  u64 flags = shdr.sh_flags & ~(u64)(SHF_COMPRESSED | SHF_GROUP | SHF_GNU_RETAIN);
-
-  // .init_array is usually writable. We don't want to create multiple
-  // .init_array output sections, so make it always writable.
-  // So is .fini_array.
-  if (type == SHT_INIT_ARRAY || type == SHT_FINI_ARRAY)
-    flags |= SHF_WRITE;
-  return {name, type, flags};
+  return {name, type};
 }
 
 // Create output sections for input sections.
@@ -533,10 +547,7 @@ void create_output_sections(Context<E> &ctx) {
 
   struct Hash {
     size_t operator()(const OutputSectionKey &k) const {
-      u64 h = hash_string(k.name);
-      h = combine_hash(h, std::hash<u64>{}(k.type));
-      h = combine_hash(h, std::hash<u64>{}(k.flags));
-      return h;
+      return combine_hash(hash_string(k.name), std::hash<u64>{}(k.type));
     }
   };
 
@@ -560,9 +571,12 @@ void create_output_sections(Context<E> &ctx) {
         continue;
 
       const ElfShdr<E> &shdr = isec->shdr();
-      if (ctx.arg.relocatable && (shdr.sh_flags & SHF_GROUP)) {
-        OutputSection<E> *osec =
-          new OutputSection<E>(ctx, isec->name(), shdr.sh_type, shdr.sh_flags);
+      u32 sh_flags = shdr.sh_flags & ~SHF_MERGE & ~SHF_STRINGS &
+                     ~SHF_COMPRESSED & ~SHF_GNU_RETAIN;
+
+      if (ctx.arg.relocatable && (sh_flags & SHF_GROUP)) {
+        OutputSection<E> *osec = new OutputSection<E>(isec->name(), shdr.sh_type);
+        osec->sh_flags = sh_flags;
         isec->output_section = osec;
         ctx.osec_pool.emplace_back(osec);
         continue;
@@ -583,7 +597,7 @@ void create_output_sections(Context<E> &ctx) {
         }
 
         std::unique_ptr<OutputSection<E>> osec =
-          std::make_unique<OutputSection<E>>(ctx, key.name, key.type, key.flags);
+          std::make_unique<OutputSection<E>>(key.name, key.type);
 
         std::unique_lock lock(mu);
         auto [it, inserted] = map.insert({key, osec.get()});
@@ -595,11 +609,42 @@ void create_output_sections(Context<E> &ctx) {
       };
 
       OutputSection<E> *osec = get_or_insert();
+      osec->sh_flags |= sh_flags & ~SHF_GROUP;
       isec->output_section = osec;
       cache.insert({key, osec});
     }
   });
 
+  for (std::unique_ptr<OutputSection<E>> &osec : ctx.osec_pool) {
+    osec->shdr.sh_flags = osec->sh_flags;
+
+    // Handle --section-align
+    if (!ctx.arg.section_align.empty())
+      if (auto it = ctx.arg.section_align.find(osec->name);
+          it != ctx.arg.section_align.end())
+        osec->shdr.sh_addralign = it->second;
+
+    // PT_GNU_RELRO segment is a security mechanism to make more pages
+    // read-only than we could have done without it.
+    //
+    // Traditionally, sections are either read-only or read-write. If a
+    // section contains dynamic relocations, it must have been put into a
+    // read-write segment so that the program loader can mutate its
+    // contents in memory, even if no one will write to it at runtime.
+    //
+    // RELRO segment allows us to make such pages writable only when a
+    // program is being loaded. After that, the page becomes read-only.
+    //
+    // Some sections, such as .init, .fini, .got, .dynamic, contain
+    // dynamic relocations but doesn't have to be writable at runtime,
+    // so they are put into a RELRO segment.
+    u32 type = osec->shdr.sh_type;
+    u32 flags = osec->shdr.sh_flags;
+    osec->is_relro = (osec->name == ".toc" || osec->name.ends_with(".rel.ro") ||
+                      type == SHT_INIT_ARRAY || type == SHT_FINI_ARRAY ||
+                      type == SHT_PREINIT_ARRAY || (flags & SHF_TLS));
+  }
+
   // Add input sections to output sections
   std::vector<Chunk<E> *> chunks;
   for (i64 i = size; i < ctx.osec_pool.size(); i++)
@@ -661,34 +706,9 @@ void create_internal_file(Context<E> &ctx) {
     ctx.internal_esyms.push_back(esym);
   };
 
-  auto add_undef = [&](Symbol<E> *sym) {
-    obj->symbols.push_back(sym);
-    sym->value = 0xdeadbeef;
-
-    ElfSym<E> esym;
-    memset(&esym, 0, sizeof(esym));
-    esym.st_type = STT_NOTYPE;
-    esym.st_shndx = SHN_UNDEF;
-    esym.st_bind = STB_GLOBAL;
-    esym.st_visibility = STV_DEFAULT;
-    ctx.internal_esyms.push_back(esym);
-  };
-
-  // Add --defsym symbols
-  for (i64 i = 0; i < ctx.arg.defsyms.size(); i++) {
-    Symbol<E> *sym = ctx.arg.defsyms[i].first;
-    std::variant<Symbol<E> *, u64> val = ctx.arg.defsyms[i].second;
-    add(sym);
-
-    if (Symbol<E> **ref = std::get_if<Symbol<E> *>(&val)) {
-      // Add an undefined symbol to keep a reference to the defsym target.
-      // This prevents elimination by e.g. LTO or gc-sections.
-      // The undefined symbol will never make to the final object file; we
-      // double-check that the defsym target is not undefined in
-      // fix_synthetic_symbols.
-      add_undef(*ref);
-    }
-  }
+  // Add --defsym'd symbols
+  for (i64 i = 0; i < ctx.arg.defsyms.size(); i++)
+    add(ctx.arg.defsyms[i].first);
 
   // Add --section-order symbols
   for (SectionOrder &ord : ctx.arg.section_order)
@@ -782,8 +802,7 @@ void add_synthetic_symbols(Context<E> &ctx) {
     ctx._TLS_MODULE_BASE_ = add("_TLS_MODULE_BASE_", STT_TLS);
 
   if constexpr (is_riscv<E>)
-    if (!ctx.arg.shared)
-      ctx.__global_pointer = add("__global_pointer$");
+    ctx.__global_pointer = add("__global_pointer$");
 
   if constexpr (is_arm32<E>) {
     ctx.__exidx_start = add("__exidx_start");
@@ -808,6 +827,11 @@ void add_synthetic_symbols(Context<E> &ctx) {
     }
   }
 
+  if constexpr (is_ppc64v2<E>)
+    for (auto [label, insn] : ppc64_save_restore_insns)
+      if (!label.empty())
+        add(label);
+
   obj.elf_syms = ctx.internal_esyms;
   obj.has_symver.resize(ctx.internal_esyms.size() - 1);
 
@@ -821,26 +845,27 @@ void add_synthetic_symbols(Context<E> &ctx) {
 
   // Handle --defsym symbols.
   for (i64 i = 0; i < ctx.arg.defsyms.size(); i++) {
-    Symbol<E> *sym = ctx.arg.defsyms[i].first;
+    Symbol<E> *sym1 = ctx.arg.defsyms[i].first;
     std::variant<Symbol<E> *, u64> val = ctx.arg.defsyms[i].second;
 
-    Symbol<E> *target = nullptr;
-    if (Symbol<E> **ref = std::get_if<Symbol<E> *>(&val))
-      target = *ref;
+    if (Symbol<E> **ref = std::get_if<Symbol<E> *>(&val)) {
+      Symbol<E> *sym2 = *ref;
+      if (!sym2->file) {
+        Error(ctx) << "--defsym: undefined symbol: " << *sym2;
+        continue;
+      }
 
-    // If the alias refers another symobl, copy ELF symbol attributes.
-    if (target) {
       ElfSym<E> &esym = obj.elf_syms[i + 1];
-      esym.st_type = target->esym().st_type;
+      esym.st_type = sym2->esym().st_type;
       if constexpr (is_ppc64v2<E>)
-        esym.ppc_local_entry = target->esym().ppc_local_entry;
+        esym.ppc_local_entry = sym2->esym().ppc_local_entry;
+
+      if (sym2->is_absolute())
+        sym1->origin = 0;
+    } else {
+      sym1->origin = 0;
     }
-
-    // Make the target absolute if necessary.
-    if (!target || target->is_absolute())
-      sym->origin = 0;
   }
-
 }
 
 template <typename E>
@@ -972,17 +997,16 @@ void write_repro_file(Context<E> &ctx) {
   tar->append("response.txt", save_string(ctx, create_response_file(ctx)));
   tar->append("version.txt", save_string(ctx, mold_version + "\n"));
 
-  std::unordered_set<std::string> seen;
+  std::unordered_set<std::string_view> seen;
+
   for (std::unique_ptr<MappedFile<Context<E>>> &mf : ctx.mf_pool) {
-    if (!mf->parent) {
-      std::string path = to_abs_path(mf->name).string();
-      if (seen.insert(path).second) {
-        // We reopen a file because we may have modified the contents of mf
-        // in memory, which is mapped with PROT_WRITE and MAP_PRIVATE.
-        MappedFile<Context<E>> *mf2 = MappedFile<Context<E>>::must_open(ctx, path);
-        tar->append(path, mf2->get_contents());
-        mf2->unmap();
-      }
+    if (!mf->parent && seen.insert(mf->name).second) {
+      // We reopen a file because we may have modified the contents of mf
+      // in memory, which is mapped with PROT_WRITE and MAP_PRIVATE.
+      MappedFile<Context<E>> *mf2 =
+        MappedFile<Context<E>>::must_open(ctx, mf->name);
+      tar->append(path, mf2->get_contents());
+      mf2->unmap();
     }
   }
 }
@@ -1047,19 +1071,42 @@ void check_symbol_types(Context<E> &ctx) {
   });
 }
 
+template <typename E>
+static i64 get_init_fini_priority(InputSection<E> *isec) {
+  static std::regex re(R"(\.(\d+)$)", std::regex_constants::optimize);
+  std::string_view name = isec->name();
+  std::cmatch m;
+  if (std::regex_search(name.data(), name.data() + name.size(), m, re))
+    return std::stoi(m[1]);
+  return 65536;
+}
+
+template <typename E>
+static i64 get_ctor_dtor_priority(InputSection<E> *isec) {
+  auto opts = std::regex_constants::optimize | std::regex_constants::ECMAScript;
+  static std::regex re1(R"((?:clang_rt\.)?crtbegin)", opts);
+  static std::regex re2(R"((?:clang_rt\.)?crtend)", opts);
+  static std::regex re3(R"(\.(\d+)$)", opts);
+
+  // crtbegin.o and crtend.o contain marker symbols such as
+  // __CTOR_LIST__ or __DTOR_LIST__. So they have to be at the
+  // beginning or end of the section.
+  std::smatch m;
+  if (std::regex_search(isec->file.filename, m, re1))
+    return -2;
+  if (std::regex_search(isec->file.filename, m, re2))
+    return 65536;
+
+  std::string name(isec->name());
+  if (std::regex_search(name, m, re3))
+    return std::stoi(m[1]);
+  return -1;
+}
+
 template <typename E>
 void sort_init_fini(Context<E> &ctx) {
   Timer t(ctx, "sort_init_fini");
 
-  auto get_priority = [](InputSection<E> *isec) {
-    static std::regex re(R"(\.(\d+)$)", std::regex_constants::optimize);
-    std::string_view name = isec->name();
-    std::cmatch m;
-    if (std::regex_search(name.data(), name.data() + name.size(), m, re))
-      return std::stoi(m[1]);
-    return 65536;
-  };
-
   for (Chunk<E> *chunk : ctx.chunks) {
     if (OutputSection<E> *osec = chunk->to_osec()) {
       if (osec->name == ".init_array" || osec->name == ".preinit_array" ||
@@ -1068,8 +1115,14 @@ void sort_init_fini(Context<E> &ctx) {
           std::reverse(osec->members.begin(), osec->members.end());
 
         std::unordered_map<InputSection<E> *, i64> map;
-        for (InputSection<E> *isec : osec->members)
-          map.insert({isec, get_priority(isec)});
+
+        for (InputSection<E> *isec : osec->members) {
+          std::string_view name = isec->name();
+          if (name.starts_with(".ctors") || name.starts_with(".dtors"))
+            map.insert({isec, 65535 - get_ctor_dtor_priority(isec)});
+          else
+            map.insert({isec, get_init_fini_priority(isec)});
+        }
 
         sort(osec->members, [&](InputSection<E> *a, InputSection<E> *b) {
           return map[a] < map[b];
@@ -1083,27 +1136,6 @@ template <typename E>
 void sort_ctor_dtor(Context<E> &ctx) {
   Timer t(ctx, "sort_ctor_dtor");
 
-  auto get_priority = [](InputSection<E> *isec) {
-    auto opts = std::regex_constants::optimize | std::regex_constants::ECMAScript;
-    static std::regex re1(R"((?:clang_rt\.)?crtbegin)", opts);
-    static std::regex re2(R"((?:clang_rt\.)?crtend)", opts);
-    static std::regex re3(R"(\.(\d+)$)", opts);
-
-    // crtbegin.o and crtend.o contain marker symbols such as
-    // __CTOR_LIST__ or __DTOR_LIST__. So they have to be at the
-    // beginning or end of the section.
-    std::smatch m;
-    if (std::regex_search(isec->file.filename, m, re1))
-      return -2;
-    if (std::regex_search(isec->file.filename, m, re2))
-      return 65536;
-
-    std::string name(isec->name());
-    if (std::regex_search(name, m, re3))
-      return std::stoi(m[1]);
-    return -1;
-  };
-
   for (Chunk<E> *chunk : ctx.chunks) {
     if (OutputSection<E> *osec = chunk->to_osec()) {
       if (osec->name == ".ctors" || osec->name == ".dtors") {
@@ -1112,7 +1144,7 @@ void sort_ctor_dtor(Context<E> &ctx) {
 
         std::unordered_map<InputSection<E> *, i64> map;
         for (InputSection<E> *isec : osec->members)
-          map.insert({isec, get_priority(isec)});
+          map.insert({isec, get_ctor_dtor_priority(isec)});
 
         sort(osec->members, [&](InputSection<E> *a, InputSection<E> *b) {
           return map[a] < map[b];
@@ -1122,6 +1154,45 @@ void sort_ctor_dtor(Context<E> &ctx) {
   }
 }
 
+// .ctors/.dtors serves the same purpose as .init_array/.fini_array,
+// albeit with very subtly differences. Both contain pointers to
+// initializer/finalizer functions. The runtime executes them one by one
+// but in the exact opposite order to one another. Therefore, if we are to
+// place the contents of .ctors/.dtors into .init_array/.fini_array, we
+// need to reverse them.
+//
+// It's unfortunate that we have both .ctors/.dtors and
+// .init_array/.fini_array in ELF for historical reasons, but that's
+// the reality we need to deal with.
+template <typename E>
+void fixup_ctors_in_init_array(Context<E> &ctx) {
+  Timer t(ctx, "fixup_ctors_in_init_array");
+
+  for (Chunk<E> *chunk : ctx.chunks) {
+    if (OutputSection<E> *osec = chunk->to_osec()) {
+      if (osec->name == ".init_array" || osec->name == ".fini_array") {
+        for (InputSection<E> *isec : osec->members) {
+          if (isec->name().starts_with(".ctors") ||
+              isec->name().starts_with(".dtors")) {
+            if (isec->sh_size % sizeof(Word<E>)) {
+              Error(ctx) << *isec << ": section corrupted";
+              continue;
+            }
+
+            u8 *buf = (u8 *)isec->contents.data();
+            std::reverse((Word<E> *)buf, (Word<E> *)(buf + isec->sh_size));
+
+            std::span<ElfRel<E>> rels = isec->get_rels(ctx);
+            for (ElfRel<E> &r : rels)
+              r.r_offset = isec->sh_size - r.r_offset - sizeof(Word<E>);
+            std::reverse(rels.begin(), rels.end());
+          }
+        }
+      }
+    }
+  }
+}
+
 template <typename T>
 static void shuffle(std::vector<T> &vec, u64 seed) {
   if (vec.empty())
@@ -1442,20 +1513,40 @@ void scan_relocations(Context<E> &ctx) {
     Warn(ctx) << "creating a DT_TEXTREL in an output file";
 }
 
+// Compute the is_weak bit for each imported symbol.
+//
+// If all references to a shared symbol is weak, the symbol is marked
+// as weak in .dynsym.
+template <typename E>
+void compute_imported_symbol_weakness(Context<E> &ctx) {
+  Timer t(ctx, "compute_imported_symbol_weakness");
+
+  tbb::parallel_for_each(ctx.objs, [&](ObjectFile<E> *file) {
+    for (i64 i = file->first_global; i < file->elf_syms.size(); i++) {
+      const ElfSym<E> &esym = file->elf_syms[i];
+      Symbol<E> &sym = *file->symbols[i];
+
+      if (esym.is_undef() && !esym.is_weak() && sym.file && sym.file->is_dso) {
+        std::scoped_lock lock(sym.mu);
+        sym.is_weak = false;
+      }
+    }
+  });
+}
+
 // Report all undefined symbols, grouped by symbol.
 template <typename E>
 void report_undef_errors(Context<E> &ctx) {
   constexpr i64 max_errors = 3;
 
   for (auto &pair : ctx.undef_errors) {
-    std::string_view sym_name = pair.first;
+    Symbol<E> *sym = pair.first;
     std::span<std::string> errors = pair.second;
 
-    if (ctx.arg.demangle)
-      sym_name = demangle(sym_name);
-
     std::stringstream ss;
-    ss << "undefined symbol: " << sym_name << "\n";
+    ss << "undefined symbol: "
+       << (ctx.arg.demangle ? demangle(*sym) : sym->name())
+       << "\n";
 
     for (i64 i = 0; i < errors.size() && i < max_errors; i++)
       ss << errors[i];
@@ -1503,12 +1594,12 @@ void copy_chunks(Context<E> &ctx) {
   // sections first. This is because REL-type relocation sections (as
   // opposed to RELA-type) stores relocation addends to target sections.
   tbb::parallel_for_each(ctx.chunks, [&](Chunk<E> *chunk) {
-    if (chunk->shdr.sh_type != (E::is_rela ? SHT_RELA : SHT_REL))
+    if (chunk->shdr.sh_type != SHT_REL)
       copy(*chunk);
   });
 
   tbb::parallel_for_each(ctx.chunks, [&](Chunk<E> *chunk) {
-    if (chunk->shdr.sh_type == (E::is_rela ? SHT_RELA : SHT_REL))
+    if (chunk->shdr.sh_type == SHT_REL)
       copy(*chunk);
   });
 
@@ -1522,6 +1613,60 @@ void copy_chunks(Context<E> &ctx) {
     fixup_arm_exidx_section(ctx);
 }
 
+// Rewrite the leading endbr64 instruction with a nop if a function
+// symbol's address was not taken.
+template <typename E>
+void rewrite_endbr(Context<E> &ctx) {
+  Timer t(ctx, "rewrite_endbr");
+  assert(is_x86_64<E>);
+
+  // Compute address-taken bit for each symbol
+  tbb::parallel_for_each(ctx.objs, [&](ObjectFile<E> *file) {
+    for (std::unique_ptr<InputSection<E>> &isec : file->sections) {
+      if (isec && isec->is_alive && (isec->shdr().sh_flags & SHF_ALLOC)) {
+        for (const ElfRel<E> &rel : isec->get_rels(ctx)) {
+          Symbol<E> &sym = *file->symbols[rel.r_sym];
+          if (!is_func_call_rel(rel) && sym.esym().st_type == STT_FUNC) {
+            std::scoped_lock lock(sym.mu);
+            sym.address_taken = true;
+          }
+        }
+      }
+    }
+  });
+
+  // Exported symbols are conservatively assumed to be address-taken.
+  if (ctx.dynsym)
+    for (Symbol<E> *sym : ctx.dynsym->symbols)
+      if (sym && sym->is_exported)
+        sym->address_taken = true;
+
+  // Some symbols are implicitly address-taken
+  ctx.arg.entry->address_taken = true;
+  ctx.arg.init->address_taken = true;
+  ctx.arg.fini->address_taken = true;
+
+  // Rewrite endbr64 with nop
+  u8 endbr64[] = {0xf3, 0x0f, 0x1e, 0xfa};
+  u8 nop[] = {0x0f, 0x1f, 0x40, 0x00};
+
+  tbb::parallel_for_each(ctx.objs, [&](ObjectFile<E> *file) {
+    for (Symbol<E> *sym : file->symbols) {
+      if (sym->file == file && sym->esym().st_type == STT_FUNC &&
+          !sym->address_taken) {
+        if (InputSection<E> *isec = sym->get_input_section()) {
+          if (OutputSection<E> *osec = isec->output_section) {
+            u8 *buf = ctx.buf + osec->shdr.sh_offset + isec->offset +
+                      sym->value;
+            if (memcmp(buf, endbr64, 4) == 0)
+              memcpy(buf, nop, 4);
+          }
+        }
+      }
+    }
+  });
+}
+
 template <typename E>
 void construct_relr(Context<E> &ctx) {
   Timer t(ctx, "construct_relr");
@@ -1554,18 +1699,68 @@ template <typename E>
 void apply_version_script(Context<E> &ctx) {
   Timer t(ctx, "apply_version_script");
 
-  // If all patterns are simple (i.e. not containing any meta-
-  // characters and is not a C++ name), we can simply look up
-  // symbols.
-  auto is_simple = [&] {
-    for (VersionPattern &v : ctx.version_patterns)
-      if (v.is_cpp || v.pattern.find_first_of("*?[") != v.pattern.npos)
-        return false;
-    return true;
-  };
+  // Assign versions to symbols specified with `extern "C++"` or
+  // wildcard patterns first.
+  MultiGlob matcher;
+  MultiGlob cpp_matcher;
 
-  if (is_simple()) {
-    for (VersionPattern &v : ctx.version_patterns) {
+  // The "local:" label has a special meaning in the version script.
+  // It can appear in any VERSION clause, and it hides matched symbols
+  // unless other non-local patterns match to them. In other words,
+  // "local:" has lower precedence than other version definitions.
+  //
+  // If two or more non-local patterns match to the same symbol, the
+  // last one takes precedence.
+  std::vector<VersionPattern> patterns = ctx.version_patterns;
+
+  std::stable_partition(patterns.begin(), patterns.end(),
+                        [](const VersionPattern &pat) {
+    return pat.ver_idx == VER_NDX_LOCAL;
+  });
+
+  for (i64 i = 0; i < patterns.size(); i++) {
+    VersionPattern &v = patterns[i];
+    if (v.is_cpp) {
+      if (!cpp_matcher.add(v.pattern, i))
+        Fatal(ctx) << "invalid version pattern: " << v.pattern;
+    } else if (v.pattern.find_first_of("*?[") != v.pattern.npos) {
+      if (!matcher.add(v.pattern, i))
+        Fatal(ctx) << "invalid version pattern: " << v.pattern;
+    }
+  }
+
+  if (!matcher.empty() || !cpp_matcher.empty()) {
+    tbb::parallel_for_each(ctx.objs, [&](ObjectFile<E> *file) {
+      for (Symbol<E> *sym : file->get_global_syms()) {
+        if (sym->file != file)
+          continue;
+
+        std::string_view name = sym->name();
+        i64 match = -1;
+
+        if (std::optional<i64> idx = matcher.find(name))
+          match = std::max(match, *idx);
+
+        // Match non-mangled symbols against the C++ pattern as well.
+        // Weird, but required to match other linkers' behavior.
+        if (!cpp_matcher.empty()) {
+          if (std::optional<std::string_view> s = demangle_cpp(name))
+            name = *s;
+          if (std::optional<i64> idx = cpp_matcher.find(name))
+            match = std::max(match, *idx);
+        }
+
+        if (match != -1)
+          sym->ver_idx = patterns[match].ver_idx;
+      }
+    });
+  }
+
+  // Next, assign versions to symbols specified by exact name.
+  // In other words, exact matches have higher precedence over
+  // wildcard or `extern "C++"` patterns.
+  for (VersionPattern &v : patterns) {
+    if (!v.is_cpp && v.pattern.find_first_of("*?[") == v.pattern.npos) {
       Symbol<E> *sym = get_symbol(ctx, v.pattern);
 
       if (!sym->file && !ctx.arg.undefined_version)
@@ -1575,48 +1770,7 @@ void apply_version_script(Context<E> &ctx) {
       if (sym->file && !sym->file->is_dso)
         sym->ver_idx = v.ver_idx;
     }
-    return;
   }
-
-  // Otherwise, use glob pattern matchers.
-  MultiGlob matcher;
-  MultiGlob cpp_matcher;
-
-  for (i64 i = 0; i < ctx.version_patterns.size(); i++) {
-    VersionPattern &v = ctx.version_patterns[i];
-    if (v.is_cpp) {
-      if (!cpp_matcher.add(v.pattern, i))
-        Fatal(ctx) << "invalid version pattern: " << v.pattern;
-    } else {
-      if (!matcher.add(v.pattern, i))
-        Fatal(ctx) << "invalid version pattern: " << v.pattern;
-    }
-  }
-
-  tbb::parallel_for_each(ctx.objs, [&](ObjectFile<E> *file) {
-    for (Symbol<E> *sym : file->get_global_syms()) {
-      if (sym->file != file)
-        continue;
-
-      std::string_view name = sym->name();
-      i64 match = INT64_MAX;
-
-      if (std::optional<u32> idx = matcher.find(name))
-        match = std::min<i64>(match, *idx);
-
-      // Match non-mangled symbols against the C++ pattern as well.
-      // Weird, but required to match other linkers' behavior.
-      if (!cpp_matcher.empty()) {
-        if (std::optional<std::string_view> s = cpp_demangle(name))
-          name = *s;
-        if (std::optional<u32> idx = cpp_matcher.find(name))
-          match = std::min<i64>(match, *idx);
-      }
-
-      if (match != INT64_MAX)
-        sym->ver_idx = ctx.version_patterns[match].ver_idx;
-    }
-  });
 }
 
 template <typename E>
@@ -1631,6 +1785,9 @@ void parse_symbol_version(Context<E> &ctx) {
     verdefs[ctx.arg.version_definitions[i]] = i + VER_NDX_LAST_RESERVED + 1;
 
   tbb::parallel_for_each(ctx.objs, [&](ObjectFile<E> *file) {
+    if (file == ctx.internal_obj)
+      return;
+
     for (i64 i = file->first_global; i < file->elf_syms.size(); i++) {
       // Match VERSION part of symbol foo@VERSION with version definitions.
       if (!file->has_symver.get(i - file->first_global))
@@ -1640,14 +1797,8 @@ void parse_symbol_version(Context<E> &ctx) {
       if (sym->file != file)
         continue;
 
-      std::string_view ver;
-
-      if (file->is_lto_obj) {
-        ver = file->lto_symbol_versions[i - file->first_global];
-      } else {
-        const char *name = file->symbol_strtab.data() + file->elf_syms[i].st_name;
-        ver = strchr(name, '@') + 1;
-      }
+      const char *name = file->symbol_strtab.data() + file->elf_syms[i].st_name;
+      std::string_view ver = strchr(name, '@') + 1;
 
       bool is_default = false;
       if (ver.starts_with('@')) {
@@ -1689,44 +1840,122 @@ void compute_import_export(Context<E> &ctx) {
   if (!ctx.arg.shared) {
     tbb::parallel_for_each(ctx.dsos, [&](SharedFile<E> *file) {
       for (Symbol<E> *sym : file->symbols) {
-        if (sym->file && !sym->file->is_dso && sym->visibility != STV_HIDDEN) {
-          if (sym->ver_idx != VER_NDX_LOCAL ||
-              !ctx.default_version_from_version_script) {
-            std::scoped_lock lock(sym->mu);
-            sym->is_exported = true;
-          }
+        if (sym->file && !sym->file->is_dso && sym->visibility != STV_HIDDEN &&
+            sym->ver_idx != VER_NDX_LOCAL) {
+          std::scoped_lock lock(sym->mu);
+          sym->is_exported = true;
         }
       }
     });
   }
 
+  auto should_export = [&](Symbol<E> &sym) {
+    if (sym.visibility == STV_HIDDEN)
+      return false;
+
+    switch (sym.ver_idx) {
+    case VER_NDX_UNSPECIFIED:
+      if (ctx.arg.shared)
+        return !((ObjectFile<E> *)sym.file)->exclude_libs;
+      return ctx.arg.export_dynamic;
+    case VER_NDX_LOCAL:
+      return false;
+    default:
+      return true;
+    }
+  };
+
   // Export symbols that are not hidden or marked as local.
   // We also want to mark imported symbols as such.
   tbb::parallel_for_each(ctx.objs, [&](ObjectFile<E> *file) {
     for (Symbol<E> *sym : file->get_global_syms()) {
-      if (!sym->file || sym->visibility == STV_HIDDEN ||
-          sym->ver_idx == VER_NDX_LOCAL)
-        continue;
-
-      // If we are using a symbol in a DSO, we need to import it at runtime.
-      if (sym->file != file && sym->file->is_dso && !sym->is_absolute()) {
+      // If we are using a symbol in a DSO, we need to import it.
+      if (sym->file && sym->file->is_dso) {
         std::scoped_lock lock(sym->mu);
         sym->is_imported = true;
         continue;
       }
 
-      // If we are creating a DSO, all global symbols are exported by default.
-      if (sym->file == file) {
-        std::scoped_lock lock(sym->mu);
+      // If we have a definition of a symbol, we may want to export it.
+      if (sym->file == file && should_export(*sym)) {
         sym->is_exported = true;
 
-        if (ctx.arg.shared && sym->visibility != STV_PROTECTED &&
+        // Exported symbols are marked as imported as well by default
+        // for DSOs.
+        if (ctx.arg.shared &&
+            sym->visibility != STV_PROTECTED &&
             !ctx.arg.Bsymbolic &&
             !(ctx.arg.Bsymbolic_functions && sym->get_type() == STT_FUNC))
           sym->is_imported = true;
       }
     }
   });
+
+
+  // Apply --dynamic-list, --export-dynamic-symbol and
+  // --export-dynamic-symbol-list options.
+  //
+  // The semantics of these options vary depending on whether we are
+  // creating an executalbe or a shared object.
+  //
+  // For executable, matched symbols are exported.
+  //
+  // For shared objects, matched symbols are imported if it is already
+  // exported so that they are interposable. In other words, symbols
+  // that did not match will be bound locally within the output file,
+  // effectively turning them into protected symbols.
+  MultiGlob matcher;
+  MultiGlob cpp_matcher;
+
+  auto handle_match = [&](Symbol<E> *sym) {
+    if (ctx.arg.shared) {
+      if (sym->is_exported)
+        sym->is_imported = true;
+    } else {
+      if (sym->file && !sym->file->is_dso && sym->visibility != STV_HIDDEN)
+        sym->is_exported = true;
+    }
+  };
+
+  for (DynamicPattern &p : ctx.dynamic_list_patterns) {
+    if (p.is_cpp) {
+      if (!cpp_matcher.add(p.pattern, 1))
+        Fatal(ctx) << p.source << ": invalid dynamic list entry: "
+                   << p.pattern;
+      continue;
+    }
+
+    if (p.pattern.find_first_of("*?[") != p.pattern.npos) {
+      if (!matcher.add(p.pattern, 1))
+        Fatal(ctx) << p.source << ": invalid dynamic list entry: "
+                   << p.pattern;
+      continue;
+    }
+
+    handle_match(get_symbol(ctx, p.pattern));
+  }
+
+  if (!matcher.empty() || !cpp_matcher.empty()) {
+    tbb::parallel_for_each(ctx.objs, [&](ObjectFile<E> *file) {
+      for (Symbol<E> *sym : file->get_global_syms()) {
+        if (sym->file != file)
+          continue;
+        if (ctx.arg.shared && !sym->is_exported)
+          continue;
+
+        std::string_view name = sym->name();
+
+        if (matcher.find(name)) {
+          handle_match(sym);
+        } else if (!cpp_matcher.empty()) {
+          if (std::optional<std::string_view> s = demangle_cpp(name))
+            name = *s;
+          if (cpp_matcher.find(name))
+            handle_match(sym);
+        }
+      }
+    });
+  }
 }
 
 // Compute the "address-taken" bit for each input section.
@@ -1783,14 +2012,14 @@ void compute_address_significance(Context<E> &ctx) {
   };
 
   // Some symbols' pointer values are leaked to the dynamic section.
-  mark(get_symbol(ctx, ctx.arg.entry));
-  mark(get_symbol(ctx, ctx.arg.init));
-  mark(get_symbol(ctx, ctx.arg.fini));
+  mark(ctx.arg.entry);
+  mark(ctx.arg.init);
+  mark(ctx.arg.fini);
 
   // Exported symbols are conservatively considered address-taken.
   if (ctx.dynsym)
     for (Symbol<E> *sym : ctx.dynsym->symbols)
-      if (sym->is_exported)
+      if (sym && sym->is_exported)
         mark(sym);
 
   // Handle data objects.
@@ -1798,11 +2027,8 @@ void compute_address_significance(Context<E> &ctx) {
     if (InputSection<E> *sec = file->llvm_addrsig.get()) {
       u8 *p = (u8 *)sec->contents.data();
       u8 *end = p + sec->contents.size();
-      while (p != end) {
-        Symbol<E> *sym = file->symbols[read_uleb(&p)];
-        if (InputSection<E> *isec = sym->get_input_section())
-          isec->address_taken = true;
-      }
+      while (p != end)
+        mark(file->symbols[read_uleb(&p)]);
     } else {
       for (std::unique_ptr<InputSection<E>> &isec : file->sections)
         if (isec && !(isec->shdr().sh_flags & SHF_EXECINSTR))
@@ -2133,7 +2359,7 @@ static void set_virtual_addresses_regular(Context<E> &ctx) {
       i64 flags1 = get_flags(chunks[i - 1]);
       i64 flags2 = get_flags(chunks[i]);
 
-      if (flags1 != flags2) {
+      if (!ctx.arg.nmagic && flags1 != flags2) {
         switch (ctx.arg.z_separate_code) {
         case SEPARATE_LOADABLE_SEGMENTS:
           addr = align_to(addr, ctx.page_size);
@@ -2279,6 +2505,8 @@ static i64 set_file_offsets(Context<E> &ctx) {
     }
 
     if (first.shdr.sh_type == SHT_NOBITS) {
+      fileoff = align_to(fileoff, first.shdr.sh_addralign);
+      first.shdr.sh_offset = fileoff;
       i++;
       continue;
     }
@@ -2319,8 +2547,11 @@ static i64 set_file_offsets(Context<E> &ctx) {
 
     while (i < chunks.size() &&
            (chunks[i]->shdr.sh_flags & SHF_ALLOC) &&
-           chunks[i]->shdr.sh_type == SHT_NOBITS)
+           chunks[i]->shdr.sh_type == SHT_NOBITS) {
+      fileoff = align_to(fileoff, chunks[i]->shdr.sh_addralign);
+      chunks[i]->shdr.sh_offset = fileoff;
       i++;
+	}
   }
 
   return fileoff;
@@ -2564,6 +2795,18 @@ void fix_synthetic_symbols(Context<E> &ctx) {
     }
   }
 
+  // PPC64's _{save,rest}gpr{0,1}_{14,15,16,...,31} symbols
+  if constexpr (is_ppc64v2<E>) {
+    i64 offset = 0;
+    for (auto [label, insn] : ppc64_save_restore_insns) {
+      if (!label.empty())
+        if (Symbol<E> *sym = get_symbol(ctx, label);
+            sym->file == ctx.internal_obj)
+          start(sym, ctx.extra.save_restore, offset);
+      offset += 4;
+    }
+  }
+
   // __start_ and __stop_ symbols
   for (Chunk<E> *chunk : sections) {
     if (std::optional<std::string> name = get_start_stop_name(ctx, *chunk)) {
@@ -2592,18 +2835,12 @@ void fix_synthetic_symbols(Context<E> &ctx) {
     if (u64 *addr = std::get_if<u64>(&val)) {
       sym->origin = 0;
       sym->value = *addr;
-      continue;
+    } else {
+      Symbol<E> *sym2 = std::get<Symbol<E> *>(val);
+      sym->value = sym2->value;
+      sym->origin = sym2->origin;
+      sym->visibility = sym2->visibility.load();
     }
-
-    Symbol<E> *sym2 = std::get<Symbol<E> *>(val);
-    if (!sym2->file) {
-      Error(ctx) << "--defsym: undefined symbol: " << *sym2;
-      continue;
-    }
-
-    sym->value = sym2->value;
-    sym->origin = sym2->origin;
-    sym->visibility = sym2->visibility.load();
   }
 
 
@@ -2726,7 +2963,7 @@ void show_stats(Context<E> &ctx) {
     static Counter thunk_bytes("thunk_bytes");
     for (Chunk<E> *chunk : ctx.chunks)
       if (OutputSection<E> *osec = chunk->to_osec())
-        for (std::unique_ptr<RangeExtensionThunk<E>> &thunk : osec->thunks)
+        for (std::unique_ptr<Thunk<E>> &thunk : osec->thunks)
           thunk_bytes += thunk->size();
   }
 
@@ -2756,14 +2993,17 @@ template void check_duplicate_symbols(Context<E> &);
 template void check_symbol_types(Context<E> &);
 template void sort_init_fini(Context<E> &);
 template void sort_ctor_dtor(Context<E> &);
+template void fixup_ctors_in_init_array(Context<E> &);
 template void shuffle_sections(Context<E> &);
 template void compute_section_sizes(Context<E> &);
 template void sort_output_sections(Context<E> &);
 template void claim_unresolved_symbols(Context<E> &);
+template void compute_imported_symbol_weakness(Context<E> &);
 template void scan_relocations(Context<E> &);
 template void report_undef_errors(Context<E> &);
 template void create_reloc_sections(Context<E> &);
 template void copy_chunks(Context<E> &);
+template void rewrite_endbr(Context<E> &);
 template void construct_relr(Context<E> &);
 template void create_output_symtab(Context<E> &);
 template void apply_version_script(Context<E> &);

elf/thunks.cc

@@ -119,7 +119,7 @@ static bool is_reachable(Context<E> &ctx, InputSection<E> &isec,
   return -max_distance() <= val && val < max_distance();
 }
 
-static void reset_thunk(RangeExtensionThunk<E> &thunk) {
+static void reset_thunk(Thunk<E> &thunk) {
   for (Symbol<E> *sym : thunk.symbols) {
     sym->extra.thunk_idx = -1;
     sym->extra.thunk_sym_idx = -1;
@@ -129,10 +129,10 @@ static void reset_thunk(RangeExtensionThunk<E> &thunk) {
 
 // Scan relocations to collect symbols that need thunks.
 static void scan_rels(Context<E> &ctx, InputSection<E> &isec,
-                      RangeExtensionThunk<E> &thunk, i64 thunk_idx) {
+                      Thunk<E> &thunk, i64 thunk_idx) {
   std::span<const ElfRel<E>> rels = isec.get_rels(ctx);
-  std::vector<RangeExtensionRef> &range_extn = isec.extra.range_extn;
-  range_extn.resize(rels.size());
+  std::vector<ThunkRef> &thunk_refs = isec.extra.thunk_refs;
+  thunk_refs.resize(rels.size());
 
   for (i64 i = 0; i < rels.size(); i++) {
     const ElfRel<E> &rel = rels[i];
@@ -151,15 +151,15 @@ static void scan_rels(Context<E> &ctx, InputSection<E> &isec,
     // This relocation needs a thunk. If the symbol is already in a
     // previous thunk, reuse it.
     if (sym.extra.thunk_idx != -1) {
-      range_extn[i].thunk_idx = sym.extra.thunk_idx;
-      range_extn[i].sym_idx = sym.extra.thunk_sym_idx;
+      thunk_refs[i].thunk_idx = sym.extra.thunk_idx;
+      thunk_refs[i].sym_idx = sym.extra.thunk_sym_idx;
       continue;
     }
 
     // Otherwise, add the symbol to the current thunk if it's not
     // added already.
-    range_extn[i].thunk_idx = thunk_idx;
-    range_extn[i].sym_idx = -1;
+    thunk_refs[i].thunk_idx = thunk_idx;
+    thunk_refs[i].sym_idx = -1;
 
     if (sym.flags.exchange(-1) == 0) {
       std::scoped_lock lock(thunk.mu);
@@ -170,8 +170,6 @@ static void scan_rels(Context<E> &ctx, InputSection<E> &isec,
 
 template <>
 void OutputSection<E>::create_range_extension_thunks(Context<E> &ctx) {
-  using Thunk = RangeExtensionThunk<E>;
-
   std::span<InputSection<E> *> m = members;
   if (m.empty())
     return;
@@ -179,9 +177,8 @@ void OutputSection<E>::create_range_extension_thunks(Context<E> &ctx) {
   // Initialize input sections with a dummy offset so that we can
   // distinguish sections that have got an address with the one who
   // haven't.
-  tbb::parallel_for_each(m, [](InputSection<E> *isec) {
+  for (InputSection<E> *isec : m)
     isec->offset = -1;
-  });
 
   // We create thunks from the beginning of the section to the end.
   // We manage progress using four offsets which increase monotonically.
@@ -215,7 +212,7 @@ void OutputSection<E>::create_range_extension_thunks(Context<E> &ctx) {
     // Move D foward as far as we can jump from B to a thunk at D.
     auto d_thunk_end = [&] {
       u64 d_end = align_to(offset, 1 << m[d]->p2align) + m[d]->sh_size;
-      return align_to(d_end, Thunk::alignment) + max_thunk_size;
+      return align_to(d_end, Thunk<E>::alignment) + max_thunk_size;
     };
 
     while (d < m.size() &&
@@ -243,9 +240,9 @@ void OutputSection<E>::create_range_extension_thunks(Context<E> &ctx) {
       reset_thunk(*thunks[t++]);
 
     // Create a new thunk and place it at D.
-    offset = align_to(offset, Thunk::alignment);
+    offset = align_to(offset, Thunk<E>::alignment);
     i64 thunk_idx = thunks.size();
-    Thunk *thunk = new Thunk(*this, offset);
+    Thunk<E> *thunk = new Thunk<E>(*this, offset);
     thunks.emplace_back(thunk);
 
     // Scan relocations between B and C to collect symbols that need
@@ -278,11 +275,11 @@ void OutputSection<E>::create_range_extension_thunks(Context<E> &ctx) {
                            [&](InputSection<E> *isec) {
       std::span<Symbol<E> *> syms = isec->file.symbols;
       std::span<const ElfRel<E>> rels = isec->get_rels(ctx);
-      std::span<RangeExtensionRef> range_extn = isec->extra.range_extn;
+      std::span<ThunkRef> thunk_refs = isec->extra.thunk_refs;
 
       for (i64 i = 0; i < rels.size(); i++)
-        if (range_extn[i].thunk_idx == thunk_idx)
-          range_extn[i].sym_idx = syms[rels[i].r_sym]->extra.thunk_sym_idx;
+        if (thunk_refs[i].thunk_idx == thunk_idx)
+          thunk_refs[i].sym_idx = syms[rels[i].r_sym]->extra.thunk_sym_idx;
     });
 
     // Move B forward to point to the begining of the next batch.

install-build-deps.sh

@@ -20,7 +20,7 @@ ubuntu-* | pop-* | linuxmint-* | debian-* | raspbian-*)
   apt-get install -y cmake gcc g++
   apt-get install -y file
   ;;
-fedora-*)
+fedora-* | amzn-* | rhel-*)
   dnf install -y gcc-g++ cmake
   dnf install -y glibc-static file libstdc++-static diffutils util-linux
   ;;
@@ -36,7 +36,7 @@ gentoo-*)
   emerge-webrsync
   emerge dev-util/cmake
   ;;
-arch-* | archarm-* | artix-*)
+arch-* | archarm-* | artix-* | endeavouros-*)
   pacman -Sy
   pacman -S --needed --noconfirm base-devel cmake util-linux
   ;;

test/elf/CMakeLists.txt

@@ -1,6 +1,9 @@
-option(MOLD_ENABLE_QEMU_TESTS "Enable tests on non-native targets" OFF)
+option(MOLD_ENABLE_QEMU_TESTS "Enable tests on non-native targets" ON)
+set(MACHINE ${CMAKE_HOST_SYSTEM_PROCESSOR})
 
-set(HOST ${CMAKE_HOST_SYSTEM_PROCESSOR})
+if(EXISTS "/proc/cpuinfo")
+  file(READ "/proc/cpuinfo" CPUINFO)
+endif()
 
 # CMAKE_HOST_SYSTEM_PROCESSOR returns "aarch64" on ARM32 userland
 # with ARM64 kernel. Here, we run `cc -dumpmachine` to determine the
@@ -10,82 +13,169 @@ execute_process(COMMAND ${CMAKE_C_COMPILER} -dumpmachine
   OUTPUT_VARIABLE ARCH
   ERROR_QUIET)
 if(NOT EXIT_CODE AND ARCH MATCHES "([^-]+).*")
-  set(HOST ${CMAKE_MATCH_1})
+  set(MACHINE ${CMAKE_MATCH_1})
 endif()
 
-if(${HOST} MATCHES "amd64")
-  set(HOST x86_64)
-elseif(${HOST} MATCHES "i386")
-  set(HOST i686)
-elseif(${HOST} MATCHES "arm.*")
-  set(HOST arm)
-elseif(${HOST} STREQUAL "powerpc64")
-  set(HOST ppc64)
-elseif(${HOST} STREQUAL "powerpc64le")
-  set(HOST ppc64le)
+if(${MACHINE} MATCHES "amd64")
+  set(MACHINE x86_64)
+elseif(${MACHINE} MATCHES "i386")
+  set(MACHINE i686)
+elseif(${MACHINE} MATCHES "arm.*")
+  set(MACHINE arm)
+elseif(${MACHINE} STREQUAL "powerpc64")
+  set(MACHINE ppc64)
+elseif(${MACHINE} STREQUAL "powerpc64le")
+  set(MACHINE ppc64le)
+endif()
+
+if(MOLD_ENABLE_QEMU_TESTS)
+  list(APPEND QEMU_ARCHS
+    x86_64 i386 arm aarch64 ppc ppc64 ppc64le sparc64 sh4 s390x
+    alpha riscv64 riscv32 m68k loongarch64)
+
+  LIST(APPEND TRIPLES
+    x86_64-linux-gnu
+    i686-linux-gnu
+    aarch64-linux-gnu
+    arm-linux-gnueabihf
+    riscv64-linux-gnu
+    powerpc-linux-gnu
+    powerpc64-linux-gnu
+    powerpc64le-linux-gnu
+    sparc64-linux-gnu
+    s390x-linux-gnu
+    sh4-linux-gnu
+    alpha-linux-gnu
+    riscv32-linux-gnu
+    m68k-linux-gnu
+    loongarch64-linux-gnu)
+
+  foreach(ARCH IN LISTS QEMU_ARCHS)
+    find_program(HAS_qemu-${ARCH} qemu-${ARCH})
+  endforeach()
+
+  foreach(TRIPLE IN LISTS TRIPLES)
+    find_program(HAS_${TRIPLE}-gcc ${TRIPLE}-gcc)
+  endforeach()
 endif()
 
 function(add_target ARCH TRIPLE)
-  if(${ARCH} STREQUAL ${HOST})
+  set(CPU ${ARGV2})
+
+  if(${ARCH} STREQUAL ${MACHINE})
     set(IS_NATIVE 1)
   endif()
 
-  if(IS_NATIVE OR MOLD_ENABLE_QEMU_TESTS)
-    file(GLOB ALL_TESTS RELATIVE ${CMAKE_CURRENT_LIST_DIR} CONFIGURE_DEPENDS "*.sh")
+  file(GLOB ALL_TESTS RELATIVE ${CMAKE_CURRENT_LIST_DIR} CONFIGURE_DEPENDS
+    "*.sh")
 
-    list(FILTER ALL_TESTS EXCLUDE REGEX "_")
+  list(FILTER ALL_TESTS EXCLUDE REGEX "_")
 
-    file(GLOB TESTS RELATIVE ${CMAKE_CURRENT_LIST_DIR} CONFIGURE_DEPENDS "${ARCH}_*.sh")
+  file(GLOB TESTS RELATIVE ${CMAKE_CURRENT_LIST_DIR} CONFIGURE_DEPENDS
+    "${ARCH}_*.sh")
 
-    list(APPEND TESTS ${ALL_TESTS})
+  list(APPEND TESTS ${ALL_TESTS})
 
-    foreach(TEST IN LISTS TESTS)
+  foreach(TEST IN LISTS TESTS)
+    if(CPU)
+      string(REGEX REPLACE "\\.sh$" "" TESTNAME "${ARCH}_${CPU}-${TEST}")
+    else()
       string(REGEX REPLACE "\\.sh$" "" TESTNAME "${ARCH}-${TEST}")
+    endif()
 
-      add_test(NAME ${TESTNAME}
-        COMMAND bash -x ${CMAKE_CURRENT_LIST_DIR}/${TEST}
-        WORKING_DIRECTORY ${mold_BINARY_DIR})
+    add_test(NAME ${TESTNAME}
+      COMMAND bash -x ${CMAKE_CURRENT_LIST_DIR}/${TEST}
+      WORKING_DIRECTORY ${mold_BINARY_DIR})
 
-      set_property(TEST ${TESTNAME} APPEND PROPERTY ENVIRONMENT "HOST=${HOST}")
+    set_property(TEST ${TESTNAME} APPEND PROPERTY ENVIRONMENT
+      "MACHINE=${MACHINE};CPU=${CPU}")
 
-      if(IS_NATIVE)
-        set_property(TEST ${TESTNAME} APPEND PROPERTY SKIP_REGULAR_EXPRESSION "skipped")
-      else()
-        set_property(TEST ${TESTNAME} APPEND PROPERTY ENVIRONMENT "TRIPLE=${TRIPLE}")
-      endif()
-    endforeach()
-  endif()
+    if(IS_NATIVE)
+      set_property(TEST ${TESTNAME} APPEND PROPERTY SKIP_REGULAR_EXPRESSION
+        "skipped")
+    else()
+      set_property(TEST ${TESTNAME} APPEND PROPERTY ENVIRONMENT
+        "TRIPLE=${TRIPLE}")
+    endif()
+  endforeach()
 endfunction()
 
-add_target(x86_64 x86_64-linux-gnu)
-add_target(i686 i686-linux-gnu)
-add_target(aarch64 aarch64-linux-gnu)
-add_target(arm arm-linux-gnueabihf)
-add_target(riscv64 riscv64-linux-gnu)
-add_target(ppc powerpc-linux-gnu)
-add_target(ppc64 powerpc64-linux-gnu)
-add_target(ppc64le powerpc64le-linux-gnu)
-add_target(sparc64 sparc64-linux-gnu)
-add_target(s390x s390x-linux-gnu)
-add_target(sh4 sh4-linux-gnu)
-add_target(alpha alpha-linux-gnu)
+if(${MACHINE} STREQUAL "x86_64" OR (HAS_qemu-x86_64 AND HAS_x86_64-linux-gnu-gcc))
+  add_target(x86_64 x86_64-linux-gnu)
+endif()
 
-option(MOLD_ENABLE_QEMU_TESTS_RV32 "Enable tests for RV32" OFF)
-if(MOLD_ENABLE_QEMU_TESTS_RV32)
+if(${MACHINE} STREQUAL "i686" OR (HAS_qemu-i386 AND HAS_i686-linux-gnu-gcc))
+  add_target(i686 i686-linux-gnu)
+endif()
+
+if(${MACHINE} STREQUAL "aarch64" OR (HAS_qemu-aarch64 AND HAS_aarch64-linux-gnu-gcc))
+  add_target(aarch64 aarch64-linux-gnu)
+endif()
+
+if(${MACHINE} STREQUAL "arm" OR (HAS_qemu-arm AND HAS_arm-linux-gnueabihf-gcc))
+  add_target(arm arm-linux-gnueabihf)
+endif()
+
+if(${MACHINE} STREQUAL "riscv64" OR (HAS_qemu-riscv64 AND HAS_riscv64-linux-gnu-gcc))
+  add_target(riscv64 riscv64-linux-gnu)
+endif()
+
+if(${MACHINE} STREQUAL "riscv32" OR (HAS_qemu-riscv32 AND HAS_riscv32-linux-gnu-gcc))
   add_target(riscv32 riscv32-linux-gnu)
 endif()
 
-option(MOLD_ENABLE_QEMU_TESTS_POWER10 "Enable tests for Power10" OFF)
-if(MOLD_ENABLE_QEMU_TESTS_POWER10)
-  add_target(ppc64le powerpc64le_power10-linux-gnu)
+if(${MACHINE} STREQUAL "ppc" OR (HAS_qemu-ppc AND HAS_powerpc-linux-gnu-gcc))
+  add_target(ppc powerpc-linux-gnu)
 endif()
 
-option(MOLD_ENABLE_QEMU_TESTS_M68K "Enable tests for m68k" OFF)
-if(MOLD_ENABLE_QEMU_TESTS_M68K)
+if(${MACHINE} STREQUAL "ppc64" OR (HAS_qemu-ppc64 AND HAS_powerpc64-linux-gnu-gcc))
+  add_target(ppc64 powerpc64-linux-gnu)
+endif()
+
+if(${MACHINE} STREQUAL "ppc64le" OR (HAS_qemu-ppc64le AND HAS_powerpc64le-linux-gnu-gcc))
+  add_target(ppc64le powerpc64le-linux-gnu)
+endif()
+
+if(${MACHINE} STREQUAL "ppc64le" AND "${CPUINFO}" MATCHES "POWER10")
+  add_target(ppc64le powerpc64le-linux-gnu power10)
+elseif(HAS_qemu-ppc64le AND HAS_powerpc64le-linux-gnu-gcc)
+  file(WRITE "${CMAKE_BINARY_DIR}/empty.c" "")
+
+  execute_process(
+    COMMAND powerpc64le-linux-gnu-gcc -mcpu=power10 -E
+      "${CMAKE_BINARY_DIR}/empty.c"
+    RESULT_VARIABLE GCC_EXIT_CODE
+    OUTPUT_QUIET ERROR_QUIET)
+
+  execute_process(
+    COMMAND qemu-ppc64le -cpu help
+    OUTPUT_VARIABLE QEMU_CPUS)
+
+  if("${GCC_EXIT_CODE}" EQUAL "0" AND "${QEMU_CPUS}" MATCHES power10_v2.0)
+    add_target(ppc64le powerpc64le-linux-gnu power10)
+  endif()
+endif()
+
+if(${MACHINE} STREQUAL "sparc64" OR (HAS_qemu-sparc64 AND HAS_sparc64-linux-gnu-gcc))
+  add_target(sparc64 sparc64-linux-gnu)
+endif()
+
+if(${MACHINE} STREQUAL "s390x" OR (HAS_qemu-s390x AND HAS_s390x-linux-gnu-gcc))
+  add_target(s390x s390x-linux-gnu)
+endif()
+
+if(${MACHINE} STREQUAL "sh4" OR (HAS_qemu-sh4 AND HAS_sh4-linux-gnu-gcc))
+  add_target(sh4 sh4-linux-gnu)
+endif()
+
+if(${MACHINE} STREQUAL "alpha" OR (HAS_qemu-alpha AND HAS_alpha-linux-gnu-gcc))
+  add_target(alpha alpha-linux-gnu)
+endif()
+
+if(${MACHINE} STREQUAL "m68k" OR (HAS_qemu-m68k AND HAS_m68k-linux-gnu-gcc))
   add_target(m68k m68k-linux-gnu)
 endif()
 
-option(MOLD_ENABLE_QEMU_TESTS_LOONGARCH "Enable tests for LoongArch" OFF)
-if(MOLD_ENABLE_QEMU_TESTS_LOONGARCH OR ${HOST} STREQUAL loongarch64)
+if(${MACHINE} STREQUAL "loongarch64" OR (HAS_qemu-loongarch64 AND HAS_loongarch64-linux-gnu-gcc))
   add_target(loongarch64 loongarch64-linux-gnu)
 endif()

test/elf/bno-symbolic.sh

@@ -3,7 +3,7 @@
 
 # GCC produces buggy code for this test case on s390x.
 # https://sourceware.org/bugzilla/show_bug.cgi?id=29655
-[ $MACHINE = s390x ] && $CC -v 2>&1 | grep -E '^gcc version 1[0-3]\.' && skip
+[ $MACHINE = s390x ] && $CC -v 2>&1 | grep -E '^gcc version 1[0-4]\.' && skip
 
 cat <<EOF | $CC -c -fPIC -o$t/a.o -xc -
 int foo = 4;

test/elf/build-id.sh

@@ -7,8 +7,7 @@ $CC -B. -o $t/exe $t/a.c -Wl,-build-id
 readelf -n $t/exe | grep -qv 'GNU.*0x00000010.*NT_GNU_BUILD_ID'
 
 $CC -B. -o $t/exe $t/a.c -Wl,-build-id=uuid
-readelf -nW $t/exe |
-  grep -Eq 'GNU.*0x00000010.*NT_GNU_BUILD_ID.*Build ID: ............4...[89abcdef]'
+readelf -nW $t/exe | grep -Eq 'Build ID: ............4...[89abcdef]'
 
 $CC -B. -o $t/exe $t/a.c -Wl,-build-id=md5
 readelf -n $t/exe | grep -q 'GNU.*0x00000010.*NT_GNU_BUILD_ID'

test/elf/canonical-plt.sh

@@ -3,7 +3,7 @@
 
 # GCC produces buggy code for this test case on s390x.
 # https://sourceware.org/bugzilla/show_bug.cgi?id=29655
-[ $MACHINE = s390x ] && $CC -v 2>&1 | grep -E '^gcc version 1[0-3]\.' && skip
+[ $MACHINE = s390x ] && $CC -v 2>&1 | grep -E '^gcc version 1[0-4]\.' && skip
 
 cat <<EOF | $CC -o $t/a.so -fPIC -shared -xc -
 void *foo() {

test/elf/common.inc

@@ -5,7 +5,7 @@ export LC_ALL=C
 
 canonical_name() {
   case $1 in
-  i?86) echo i386 ;;
+  i?86) echo i686 ;;
   arm*) echo arm ;;
   powerpc) echo ppc ;;
   powerpc64) echo ppc64 ;;
@@ -14,14 +14,13 @@ canonical_name() {
   esac
 }
 
-if [ -z "$HOST" ]; then
-  HOST=$(canonical_name $(uname -m))
+if [ -z "$MACHINE" ]; then
+  MACHINE=$(canonical_name $(uname -m))
 fi
 
 # Set tool names
 if [ -z "$TRIPLE" ]; then
-  MACHINE=$HOST
-  TESTDIR=out/test/elf/$HOST
+  TESTDIR=out/test/elf/$MACHINE
   CC="${TEST_CC:-cc}"
   CXX="${TEST_CXX:-c++}"
   GCC="${TEST_GCC:-gcc}"
@@ -30,8 +29,7 @@ if [ -z "$TRIPLE" ]; then
   OBJCOPY=objcopy
   STRIP=strip
   QEMU=
-elif [ "$TRIPLE" = powerpc64le_power10-linux-gnu ]; then
-  TRIPLE=powerpc64le-linux-gnu
+elif [ "$TRIPLE" = powerpc64le-linux-gnu -a "$CPU" = power10 ]; then
   MACHINE=ppc64le
   TESTDIR=out/test/elf/ppc64le-power10
   CC="${TEST_CC:-$TRIPLE-gcc} -mcpu=power10"
@@ -52,22 +50,20 @@ else
   OBJDUMP="$TRIPLE-objdump"
   OBJCOPY="$TRIPLE-objcopy"
   STRIP="$TRIPLE-strip"
-  QEMU="qemu-$MACHINE -L /usr/$TRIPLE"
+
+  if [ $MACHINE = i686 ]; then
+    QEMU="qemu-i386 -L /usr/$TRIPLE"
+  else
+    QEMU="qemu-$MACHINE -L /usr/$TRIPLE"
+  fi
 fi
 
-if [ $MACHINE = x86_64 -o $MACHINE = i386 -o $MACHINE = arm ]; then
+if [ $MACHINE = x86_64 -o $MACHINE = i686 -o $MACHINE = arm ]; then
   tlsdesc_opt=-mtls-dialect=gnu2
 elif [ $MACHINE = aarch64 ]; then
   tlsdesc_opt=-mtls-dialect=desc
 fi
 
-if [ $MACHINE = ppc64le -a -e /proc/cpuinfo ] && grep -q POWER10 /proc/cpuinfo; then
-  CC="$CC -mcpu=power10"
-  CXX="$CXX -mcpu=power10"
-  GCC="$GCC -mcpu=power10"
-  GXX="$GXX -mcpu=power10"
-fi
-
 # Common functions
 test_cflags() {
   echo 'int main() {}' | $CC "$@" -o /dev/null -xc - >& /dev/null

test/elf/copyrel-relro2.sh

@@ -1,7 +1,6 @@
 #!/bin/bash
 . $(dirname $0)/common.inc
 
-
 cat <<EOF | $CC -o $t/a.o -c -xc -fno-PIE -
 #include <setjmp.h>
 #include <signal.h>
@@ -32,7 +31,7 @@ int main() {
 }
 EOF
 
-cat <<EOF | $CC -fPIC -shared -o $t/b.so -xc -
+cat <<EOF | $CC -B. -fPIC -shared -o $t/b.so -xc -
 __attribute__((section (".data.rel.ro"))) char readonly[100] = "abc";
 char readwrite[100] = "abc";
 EOF

test/elf/ctors-in-init-array.sh

@@ -0,0 +1,55 @@
+#!/bin/bash
+. $(dirname $0)/common.inc
+
+cat <<EOF | $CC -o $t/a.o -c -xc -
+#include <stdio.h>
+
+static void ctor1() { printf("ctor1 "); }
+static void ctor2() { printf("ctor2 "); }
+static void ctor3() { printf("ctor3 "); }
+static void ctor4() { printf("ctor4 "); }
+
+static void dtor1() { printf("dtor1 "); }
+static void dtor2() { printf("dtor2 "); }
+static void dtor3() { printf("dtor3 "); }
+static void dtor4() { printf("dtor4 "); }
+
+__attribute__((aligned(sizeof(void *)), section(".ctors.65435")))
+void (*ctors65435[])()  = { ctor1 };
+
+__attribute__((aligned(sizeof(void *)), section(".ctors.65433")))
+void (*ctors65433[])()  = { ctor2 };
+
+__attribute__((aligned(sizeof(void *)), section(".ctors")))
+void (*ctors[])()  = { ctor4, ctor3 };
+
+__attribute__((aligned(sizeof(void *)), section(".dtors")))
+void (*dtors[])()  = { dtor1, dtor2 };
+
+__attribute__((aligned(sizeof(void *)), section(".dtors.65433")))
+void (*dtors65433[])()  = { dtor3 };
+
+__attribute__((aligned(sizeof(void *)), section(".dtors.65435")))
+void (*dtors65435[])()  = { dtor4 };
+EOF
+
+cat <<EOF | $CC -o $t/b.o -c -xc -
+#include <stdio.h>
+
+__attribute__((constructor(101)))
+static void init1() { printf("init1 "); }
+
+__attribute__((constructor))
+static void init2() { printf("init2 "); }
+
+__attribute__((destructor(101)))
+static void fini1() { printf("fini1 "); }
+
+__attribute__((destructor))
+static void fini2() { printf("fini2 "); }
+
+int main() {}
+EOF
+
+$CC -B. -o $t/exe $t/a.o $t/b.o
+$QEMU $t/exe | grep -q 'ctor1 init1 ctor2 ctor3 ctor4 init2 fini2 dtor1 dtor2 dtor3 fini1 dtor4'

test/elf/defsym-missing-symbol.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+. $(dirname $0)/common.inc
+
+cat <<EOF | $CC -o $t/a.o -c -xc -
+int main() {}
+EOF
+
+! $CC -B. -o $t/exe $t/a.o -Wl,-defsym=foo=bar 2> $t/log
+grep -q 'undefined symbol: bar' $t/log

test/elf/demangle-cpp.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+. $(dirname $0)/common.inc
+
+cat <<'EOF' | $CC -c -o $t/a.o -xc -
+void _ZN2ns7versionEv();
+int main() { _ZN2ns7versionEv(); }
+EOF
+
+! $CC -B. -o $t/exe1 $t/a.o 2> $t/log || false
+grep -Fq 'ns::version()' $t/log
+
+cat <<'EOF' | $CC -c -o $t/b.o -xc -
+void _ZN2ns7versionEv();
+int main() { _ZN2ns7versionEv(); }
+__attribute__((section(".comment"))) char str[] = "rustc version x.y.z\n";
+EOF
+
+! $CC -B. -o $t/exe2 $t/b.o 2> $t/log || false
+grep -Fq 'ns::versionv' $t/log

test/elf/dynamic-list4.sh

@@ -0,0 +1,44 @@
+#!/bin/bash
+. $(dirname $0)/common.inc
+
+cat <<EOF | $CC -o $t/a.o -c -xc - -fPIC
+#include <stdio.h>
+
+void foo() { printf("foo1 "); }
+void bar() { printf("bar1 "); }
+void baz() { printf("baz1 "); }
+
+void print() {
+  foo();
+  bar();
+  baz();
+  printf("\n");
+}
+EOF
+
+cat <<EOF > $t/dyn
+{ foo; bar; };
+EOF
+
+$CC -B. -shared -o $t/b.so $t/a.o -Wl,--dynamic-list=$t/dyn
+
+cat <<EOF | $CC -o $t/c.o -c -xc - -fPIC
+#include <stdio.h>
+void foo() { printf("foo2 "); }
+void bar() { printf("bar2 "); }
+void baz() { printf("baz2 "); }
+EOF
+
+$CC -B. -shared -o $t/d.so $t/c.o
+
+cat <<EOF | $CC -o $t/e.o -c -xc -
+#include <stdio.h>
+void print();
+int main() { print(); }
+EOF
+
+$CC -B. -o $t/exe1 $t/e.o -Wl,-push-state,-no-as-needed $t/b.so -Wl,-pop-state
+$QEMU $t/exe1 | grep -q 'foo1 bar1 baz1'
+
+$CC -B. -o $t/exe2 $t/e.o -Wl,-push-state,-no-as-needed $t/d.so $t/b.so -Wl,-pop-state
+$QEMU $t/exe2 | grep -q 'foo2 bar2 baz1'

test/elf/emit-relocs-dead-sections.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 . $(dirname $0)/common.inc
 
+[ $MACHINE = m68k ] && skip
 [ $MACHINE = sh4 ] && skip
 
 cat <<EOF | $CXX -o $t/a.o -c -fPIC -xc++ -g -ffunction-sections -

test/elf/exception-multiple-ehframe.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+. $(dirname $0)/common.inc
+
+nm mold | grep -q '__tsan_init' && skip
+
+[ $MACHINE = m68k ] && skip
+[ $MACHINE = sh4 ] && skip
+
+cat <<EOF | $CXX -o $t/a.o -c -xc++ -
+int foo() {
+  try {
+    throw 1;
+  } catch (int x) {
+    return x;
+  }
+  return 2;
+}
+EOF
+
+cat <<EOF | $CXX -o $t/b.o -c -xc++ -
+int bar() {
+  try {
+    throw 3;
+  } catch (int x) {
+    return x;
+  }
+  return 4;
+}
+EOF
+
+$OBJCOPY --rename-section .eh_frame=.eh_frame2 $t/a.o
+./mold -r -o $t/c.o $t/a.o $t/b.o
+$OBJCOPY --rename-section .eh_frame2=.eh_frame $t/c.o
+
+cat <<EOF | $CXX -o $t/d.o -c -xc++ -
+#include <stdio.h>
+
+int foo();
+int bar();
+
+int main() {
+  printf("%d %d\n", foo(), bar());
+}
+EOF
+
+$CXX -B. -o $t/exe1 $t/d.o $t/c.o
+$QEMU $t/exe1
+$QEMU $t/exe1 | grep -q '^1 3$'

test/elf/exception.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 . $(dirname $0)/common.inc
 
+[ $MACHINE = m68k ] && skip
 [ $MACHINE = sh4 ] && skip
 
 static=

test/elf/gdb-index-compress-output.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 . $(dirname $0)/common.inc
 
-[ $MACHINE = $HOST ] || skip
+[ "$QEMU" = '' ] || skip
 [ $MACHINE = riscv64 -o $MACHINE = riscv32 -o $MACHINE = sparc64 ] && skip
 
 command -v gdb >& /dev/null || skip

test/elf/gdb-index-dwarf2.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 . $(dirname $0)/common.inc
 
-[ $MACHINE = $HOST ] || skip
+[ "$QEMU" = '' ] || skip
 [ $MACHINE = riscv64 -o $MACHINE = riscv32 -o $MACHINE = sparc64 ] && skip
 
 command -v gdb >& /dev/null || skip

test/elf/gdb-index-dwarf3.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 . $(dirname $0)/common.inc
 
-[ $MACHINE = $HOST ] || skip
+[ "$QEMU" = '' ] || skip
 [ $MACHINE = riscv64 -o $MACHINE = riscv32 -o $MACHINE = sparc64 ] && skip
 
 command -v gdb >& /dev/null || skip

test/elf/gdb-index-dwarf4.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 . $(dirname $0)/common.inc
 
-[ $MACHINE = $HOST ] || skip
+[ "$QEMU" = '' ] || skip
 [ $MACHINE = riscv64 -o $MACHINE = riscv32 -o $MACHINE = sparc64 ] && skip
 
 command -v gdb >& /dev/null || skip

test/elf/gdb-index-dwarf5.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 . $(dirname $0)/common.inc
 
-[ $MACHINE = $HOST ] || skip
+[ "$QEMU" = '' ] || skip
 [ $MACHINE = riscv64 -o $MACHINE = riscv32 -o $MACHINE = sparc64 ] && skip
 
 command -v gdb >& /dev/null || skip

test/elf/gdb-index-dwarf64.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 . $(dirname $0)/common.inc
 
-[ $MACHINE = $HOST ] || skip
+[ "$QEMU" = '' ] || skip
 [ $MACHINE = riscv64 -o $MACHINE = riscv32 -o $MACHINE = sparc64 ] && skip
 
 command -v gdb >& /dev/null || skip

test/elf/gdb-index-split-dwarf.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 . $(dirname $0)/common.inc
 
-[ $MACHINE = $HOST ] || skip
+[ "$QEMU" = '' ] || skip
 [ $MACHINE = riscv64 -o $MACHINE = riscv32 -o $MACHINE = sparc64 ] && skip
 
 command -v gdb >& /dev/null || skip

test/elf/global-offset-table.sh

@@ -20,7 +20,7 @@ GOT_ADDR=$($QEMU $t/exe)
 
 # _GLOBAL_OFFSET_TABLE_ refers the end of .got only on x86.
 # We assume .got is followed by .gotplt.
-if [ $MACHINE = x86_64 -o $MACHINE = i386 ]; then
+if [ $MACHINE = x86_64 -o $MACHINE = i686 ]; then
   readelf -WS $t/exe | grep -q "\.got\.plt .*$GOT_ADDR "
 else
   readelf -WS $t/exe | grep -q "\.got .*$GOT_ADDR "

test/elf/gnu-unique.sh

@@ -18,5 +18,5 @@ int main() {
 }
 EOF
 
-$CC -B. -o $t/exe $t/a.o $t/b.o
+$CC -B. -o $t/exe $t/a.o $t/b.o -no-pie
 $QEMU $t/exe | grep -q 'foo=5'

test/elf/gnu-warning.sh

@@ -16,5 +16,5 @@ int main() {
 EOF
 
 # Make sure that we do not copy .gnu.warning.* sections.
-$CC -B. -o $t/exe $t/a.o
+$CC -B. -o $t/exe $t/a.o -no-pie
 $QEMU $t/exe | grep -q 'Hello world'

test/elf/i686_tls-module-base.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 . $(dirname $0)/common.inc
 
-[ $MACHINE = i386 ] || skip
+[ $MACHINE = i686 ] || skip
 
 cat <<'EOF' | $CC -fPIC -o $t/a.o -c -xassembler -
 .globl get_foo

test/elf/i686_tlsdesc.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+. $(dirname $0)/common.inc
+
+supports_tlsdesc || skip
+
+cat <<'EOF' | $GCC -c -o $t/a.o -xassembler -
+.globl  get_foo
+.type   get_foo, @function
+get_foo:
+  pushl   %ebx
+  call    __x86.get_pc_thunk.bx
+  addl    $_GLOBAL_OFFSET_TABLE_, %ebx
+  subl    $8, %esp
+  leal    foo@TLSDESC(%ebx), %ebx
+  movl    %ebx, %eax
+  call    *foo@TLSCALL(%eax)
+  movl    %gs:(%eax), %eax
+  addl    $8, %esp
+  popl    %ebx
+  ret
+EOF
+
+cat <<EOF | $GCC -fPIC -c -o $t/b.o -xc - $tlsdesc_opt
+#include <stdio.h>
+
+_Thread_local int foo;
+
+int get_foo();
+
+int main() {
+  foo = 42;
+  printf("%d\n", get_foo());
+}
+EOF
+
+$CC -B. -o $t/exe1 $t/a.o $t/b.o
+$QEMU $t/exe1 | grep -q 42
+
+$CC -B. -o $t/exe2 $t/a.o $t/b.o -Wl,-no-relax
+$QEMU $t/exe2 | grep -q 42
+
+$CC -B. -shared -o $t/c.so $t/a.o
+$CC -B. -o $t/exe3 $t/b.o $t/c.so
+$QEMU $t/exe3 | grep -q 42
+
+$CC -B. -shared -o $t/c.so $t/a.o -Wl,-no-relax
+$CC -B. -o $t/exe4 $t/b.o $t/c.so -Wl,-no-relax
+$QEMU $t/exe4 | grep -q 42

test/elf/ifunc-address-equality-exported.sh

@@ -29,5 +29,5 @@ int main() {
 }
 EOF
 
-$CC -B. -o $t/exe1 $t/c.o $t/b.so -no-pie
-$QEMU $t/exe1 | grep -Eq '^(\S+) \1'
+$CC -B. -o $t/exe $t/c.o $t/b.so -no-pie
+$QEMU $t/exe | grep -Eq '^(\S+) \1'

test/elf/ifunc-alias.sh

@@ -16,5 +16,8 @@ int main() {
 }
 EOF
 
-$CC -B. -o $t/exe $t/a.o
-$QEMU $t/exe | grep -Eq '^(\S+) \1$'
+$CC -B. -o $t/exe1 $t/a.o -pie
+$QEMU $t/exe1 | grep -Eq '^(\S+) \1$'
+
+$CC -B. -o $t/exe2 $t/a.o -no-pie
+$QEMU $t/exe2 | grep -Eq '^(\S+) \1$'

test/elf/ifunc-funcptr.sh

@@ -33,5 +33,8 @@ int main() {
 }
 EOF
 
-$CC -B. -o $t/exe $t/a.o $t/b.o $t/c.o
-$QEMU $t/exe | grep -q '^3$'
+$CC -B. -o $t/exe1 $t/a.o $t/b.o $t/c.o -pie
+$QEMU $t/exe1 | grep -q '^3$'
+
+$CC -B. -o $t/exe2 $t/a.o $t/b.o $t/c.o -no-pie
+$QEMU $t/exe2 | grep -q '^3$'

test/elf/ifunc-noplt.sh

@@ -24,5 +24,8 @@ int main() {
 }
 EOF
 
-$CC -B. -o $t/exe $t/a.o
-$QEMU $t/exe | grep -q 'Hello world'
+$CC -B. -o $t/exe1 $t/a.o -pie
+$QEMU $t/exe1 | grep -q 'Hello world'
+
+$CC -B. -o $t/exe2 $t/a.o -no-pie
+$QEMU $t/exe2 | grep -q 'Hello world'

test/elf/issue646.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 . $(dirname $0)/common.inc
 
+[ $MACHINE = m68k ] && skip
 [ $MACHINE = sh4 ] && skip
 
 cat <<EOF | $CXX -o $t/a.o -c -xc++ -

test/elf/large-alignment-dso.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 . $(dirname $0)/common.inc
 
-[ $MACHINE = i386 ] && skip
+[ $MACHINE = i686 ] && skip
 
 cat <<EOF | $CC -o $t/a.o -c -xc - -ffunction-sections -fPIC
 #include <stdio.h>

test/elf/large-alignment.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 . $(dirname $0)/common.inc
 
-[ $MACHINE = i386 ] && skip
+[ $MACHINE = i686 ] && skip
 
 cat <<EOF | $CC -o $t/a.o -c -xc - -ffunction-sections
 #include <stdio.h>

test/elf/nmagic.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+. $(dirname $0)/common.inc
+
+cat <<EOF | $CC -o $t/a.o -c -xc -
+void _start() {}
+EOF
+
+$CC -B. -o $t/exe1 $t/a.o -nostdlib -Wl,-nmagic
+$CC -B. -o $t/exe2 $t/a.o -nostdlib
+
+end1=$(nm $t/exe1 | grep ' end$' | cut -d' ' -f1)
+end2=$(nm $t/exe2 | grep ' end$' | cut -d' ' -f1)
+
+[ $((0x$end1)) -lt $((0x$end2)) ]

test/elf/nocopyreloc.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 . $(dirname $0)/common.inc
 
-[ $MACHINE = i386 ] && skip
+[ $MACHINE = i686 ] && skip
 [ $MACHINE = m68k ] && skip
 [ $MACHINE = arm ] && skip
 [ $MACHINE = ppc64 ] && skip

test/elf/ppc64le_save_restore_gprs.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+. $(dirname $0)/common.inc
+
+cat <<EOF | $CC -o $t/a.o -c -xc -
+#include <stdio.h>
+int main() {
+  printf("Hello world\n");
+}
+EOF
+
+$CC -B. -o $t/exe $t/a.o
+$OBJDUMP -d $t/exe | grep -q '<_savegpr0_14>'

test/elf/range-extension-thunk.sh

@@ -2,12 +2,16 @@
 . $(dirname $0)/common.inc
 
 # Skip if 32 bits as we use very large addresses in this test.
-[ $MACHINE = i386 ] && skip
+[ $MACHINE = i686 ] && skip
 [ $MACHINE = riscv32 ] && skip
 
 # It looks like SPARC's runtime can't handle PLT if it's too far from GOT.
 [ $MACHINE = sparc64 ] && skip
 
+# qemu aborts with the "Unknown exception 0x5" error, although this
+# test passes on a real POWER10 machine.
+[ -n "$QEMU" -a "$CPU" = power10 ] && skip
+
 cat <<EOF > $t/a.c
 #include <stdio.h>
 

test/elf/relocatable-c++.sh

@@ -4,7 +4,8 @@
 # OneTBB isn't tsan-clean
 nm mold | grep -q '__tsan_init' && skip
 
-# Ubuntu 22.04 SH4 GCC is broken
+# Ubuntu 22.04 GCC is broken
+[ $MACHINE = m68k ] && skip
 [ $MACHINE = sh4 ] && skip
 
 cat <<EOF | $CXX -c -o $t/a.o -xc++ -

test/elf/relocatable-compressed-debug-info.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+. $(dirname $0)/common.inc
+
+# OneTBB isn't tsan-clean
+nm mold | grep -q '__tsan_init' && skip
+
+echo 'int main() {}' | $GCC -o /dev/null -xc -g3 -gz - >& /dev/null || skip
+
+cat <<EOF | $GCC -c -o $t/a.o -xc - -g3 -gz
+#include <stdio.h>
+void hello() { printf("Hello world\n"); }
+EOF
+
+cat <<EOF | $GCC -c -o $t/b.o -xc - -g3 -gz
+void hello();
+int main() { hello(); }
+EOF
+
+./mold --relocatable -o $t/c.o $t/a.o $t/b.o
+$CC -B. -o $t/exe $t/c.o
+$QEMU $t/exe | grep -q 'Hello world'

test/elf/relocatable-exception.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 . $(dirname $0)/common.inc
 
+[ $MACHINE = m68k ] && skip
 [ $MACHINE = sh4 ] && skip
 
 # OneTBB isn't tsan-clean

test/elf/riscv64_relax-got.sh

@@ -0,0 +1,81 @@
+#!/bin/bash
+. $(dirname $0)/common.inc
+
+[[ $MACHINE = riscv* ]] || skip
+
+cat <<EOF | $CC -o $t/a.o -c -xassembler -
+.globl get_sym1, get_sym2, get_sym3, get_sym4, get_sym5
+.option norvc
+get_sym1:
+  .reloc ., R_RISCV_GOT_HI20, sym1
+  .reloc ., R_RISCV_RELAX
+  auipc a0, 0
+  .reloc ., R_RISCV_PCREL_LO12_I, get_sym1
+  .reloc ., R_RISCV_RELAX
+  ld a0, 0(a0)
+  ret
+get_sym2:
+  .reloc ., R_RISCV_GOT_HI20, sym2
+  .reloc ., R_RISCV_RELAX
+  auipc a0, 0
+  .reloc ., R_RISCV_PCREL_LO12_I, get_sym2
+  .reloc ., R_RISCV_RELAX
+  ld a0, 0(a0)
+  ret
+get_sym3:
+  .reloc ., R_RISCV_GOT_HI20, sym3
+  .reloc ., R_RISCV_RELAX
+  auipc a0, 0
+  .reloc ., R_RISCV_PCREL_LO12_I, get_sym3
+  .reloc ., R_RISCV_RELAX
+  ld a0, 0(a0)
+  ret
+get_sym4:
+  .reloc ., R_RISCV_GOT_HI20, sym4
+  .reloc ., R_RISCV_RELAX
+  auipc a0, 0
+  .reloc ., R_RISCV_PCREL_LO12_I, get_sym4
+  .reloc ., R_RISCV_RELAX
+  ld a0, 0(a0)
+  ret
+get_sym5:
+  .reloc ., R_RISCV_GOT_HI20, sym5
+  .reloc ., R_RISCV_RELAX
+  auipc a0, 0
+  .reloc ., R_RISCV_PCREL_LO12_I, get_sym5
+  .reloc ., R_RISCV_RELAX
+  ld a0, 0(a0)
+  ret
+EOF
+
+cat <<EOF | $CC -o $t/b.o -c -xassembler -
+.globl sym1, sym2, sym3, sym4, sym5
+sym1 = 0x0
+sym2 = 0xba
+sym3 = 0xbeef
+sym4 = 0x11beef
+sym5 = 0xdeadbeef
+EOF
+
+cat <<EOF | $CC -o $t/c.o -c -xc -
+#include <stdio.h>
+
+int get_sym1();
+int get_sym2();
+int get_sym3();
+int get_sym4();
+int get_sym5();
+
+int main() {
+  printf("%x %x %x %x %x\n",
+         get_sym1(), get_sym2(), get_sym3(), get_sym4(), get_sym5());
+}
+EOF
+
+$CC -B. -o $t/exe1 $t/a.o $t/b.o $t/c.o -Wl,--no-relax
+$QEMU $t/exe1 | grep -Eq '^0 ba beef 11beef deadbeef$'
+
+$CC -B. -o $t/exe2 $t/a.o $t/b.o $t/c.o
+$QEMU $t/exe2 | grep -Eq '^0 ba beef 11beef deadbeef$'
+
+$OBJDUMP -d $t/exe2 | grep -A2 '<get_sym2>:' | grep -Eq $'li[ \t]+a0,186$'

test/elf/rodata-name.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+. $(dirname $0)/common.inc
+
+# ARM assembler has a differnet grammar than the others.
+# Concretely speaking, ARM as uses "@" as a start of a comment.
+[ $MACHINE = arm ] && skip
+
+cat <<'EOF' | $CC -c -o $t/a.o -x assembler -
+.globl val1, val2, val3, val4, val5
+
+.section .rodata.str1.1,"aMS",@progbits,1
+val1:
+.ascii "Hello \0"
+
+.section .rodata.foo,"aMS",@progbits,4
+.p2align 2
+val2:
+.ascii "world   \0\0\0\0"
+
+.section .rodata.x,"aMS",@progbits,1
+val3:
+.ascii "foobar\0"
+
+.section .rodata.cst8,"aM",@progbits,8
+.p2align 3
+val4:
+.ascii "abcdefgh"
+
+.section .rodatabaz,"aMS",@progbits,1
+val5:
+.ascii "baz\0"
+EOF
+
+cat <<'EOF' | $CC -c -o $t/b.o -xc -
+#include <stdio.h>
+
+extern char val1, val2, val3, val4, val5;
+
+int main() {
+  printf("%p %p %p %p %p\n", &val1, &val2, &val3, &val4, &val5);
+}
+EOF
+
+$CC -B. -o $t/exe $t/a.o $t/b.o
+
+readelf -p .rodata.str1.1 $t/exe | grep -q Hello
+readelf -p .rodata.str4.4 $t/exe | grep -q world
+readelf -p .rodata.str1.1 $t/exe | grep -q foobar
+readelf -p .rodata.cst8 $t/exe | grep -q abcdefgh
+readelf -p .rodatabaz $t/exe | grep -q baz

test/elf/section-attributes.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+. $(dirname $0)/common.inc
+
+cat <<EOF | $CC -o $t/a.o -c -xassembler -
+.section .foobar,"aw"
+.ascii "foo\0"
+EOF
+
+cat <<EOF | $CC -o $t/b.o -c -xassembler -
+.section .foobar,"a"
+.ascii "bar\0"
+EOF
+
+cat <<EOF | $CC -o $t/c.o -c -xassembler -
+.section .foobar,"axT"
+.ascii "bar\0"
+EOF
+
+cat <<EOF | $CC -o $t/d.o -c -xc -
+int main() {}
+EOF
+
+$CC -B. -o $t/exe $t/a.o $t/b.o $t/c.o $t/d.o
+$CC -o $t/exe $t/a.o $t/b.o $t/c.o $t/d.o
+readelf -WS $t/exe
+# readelf -WS $t/exe | grep -q 'foobar.*WAX'

test/elf/shared-abs-sym.sh

@@ -15,15 +15,13 @@ int main() { printf("foo=%p\n", &foo); }
 EOF
 
 $CC -fPIC -c -o $t/d.o $t/c.c
-$CC -B. -o $t/exe1 -pie $t/d.o $t/b.so
-$QEMU $t/exe1 | grep -q 'foo=0x3'
 
-nm -D $t/exe1 > $t/log1
-! grep -q foo $t/log1 || false
+# This test fails with older glibc
+$CC -o $t/exe1 -pie $t/d.o $t/b.so 2> /dev/null || skip
+$QEMU $t/exe1 | grep -q 'foo=0x3' || skip
 
-$CC -fPIC -c -o $t/e.o $t/c.c
-$CC -B. -o $t/exe2 -no-pie $t/e.o $t/b.so
+$CC -B. -o $t/exe2 -pie $t/d.o $t/b.so
 $QEMU $t/exe2 | grep -q 'foo=0x3'
 
-nm -D $t/exe2 > $t/log2
-! grep -q foo $t/log2 || false
+$CC -B. -o $t/exe3 -no-pie $t/d.o $t/b.so
+$QEMU $t/exe3 | grep -q 'foo=0x3'

test/elf/spare-program-headers.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+. $(dirname $0)/common.inc
+
+cat <<EOF | $CC -o $t/a.o -c -xc -
+#include <stdio.h>
+int main() {
+  printf("Hello world\n");
+}
+EOF
+
+$CC -B. -o $t/exe1 $t/a.o
+$QEMU $t/exe1 | grep -q 'Hello world'
+[ "$(readelf -Wl $t/exe1 | grep NULL | wc -l)" -eq 0 ]
+
+$CC -B. -o $t/exe2 $t/a.o -Wl,--spare-program-headers=0
+$QEMU $t/exe2 | grep -q 'Hello world'
+[ "$(readelf -Wl $t/exe2 | grep NULL | wc -l)" -eq 0 ]
+
+$CC -B. -o $t/exe3 $t/a.o -Wl,--spare-program-headers=1
+$QEMU $t/exe3 | grep -q 'Hello world'
+[ "$(readelf -Wl $t/exe3 | grep NULL | wc -l)" -eq 1 ]
+
+$CC -B. -o $t/exe4 $t/a.o -Wl,--spare-program-headers=5
+$QEMU $t/exe4 | grep -q 'Hello world'
+[ "$(readelf -Wl $t/exe4 | grep NULL | wc -l)" -eq 5 ]

test/elf/tbss-only.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+. $(dirname $0)/common.inc
+
+cat <<EOF | $CC -o $t/a.o -c -xc -
+__thread char foo;
+
+__attribute__((section(".data.rel.ro.bar"), aligned(16*1024)))
+char bar;
+
+int main() {}
+EOF
+
+$CC -B. -o $t/exe $t/a.o
+$QEMU $t/exe

test/elf/tls-common.sh

@@ -17,4 +17,5 @@ int main() {
 EOF
 
 $CC -B. -o $t/exe $t/a.o $t/b.o
+readelf -WS $t/exe | grep -Fq .tls_common
 $QEMU $t/exe | grep -q '^foo=0$'

test/elf/tls-ie.sh

@@ -19,7 +19,7 @@ EOF
 
 $CC -B. -shared -o $t/b.so $t/a.o
 
-cat <<EOF | $GCC -c -o $t/c.o -xc -
+cat <<EOF | $GCC -c -o $t/c.o -xc - -fPIC
 #include <stdio.h>
 
 _Thread_local int baz;

test/elf/tls-nopic.sh

@@ -23,5 +23,5 @@ cat <<EOF | $CC -xc -c -o $t/b.o -
 __attribute__((tls_model("global-dynamic"))) _Thread_local int foo;
 EOF
 
-$CC -B. -o $t/exe $t/a.o $t/b.o
+$CC -B. -o $t/exe $t/a.o $t/b.o -no-pie
 $QEMU $t/exe | grep -q '3 5 3 5'

test/elf/trace-symbol-symver.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+. $(dirname $0)/common.inc
+
+cat <<EOF | $CC -c -o $t/a.o -xc -
+void foo1() {}
+void foo2() {}
+void foo3() {}
+
+__asm__(".symver foo1, foo@VER1");
+__asm__(".symver foo2, foo@VER2");
+__asm__(".symver foo3, foo@@VER3");
+EOF
+
+cat <<EOF > $t/b.version
+VER1 { local: *; };
+VER2 { local: *; };
+VER3 { local: *; };
+EOF
+
+$CC -B. -o $t/c.so -shared $t/a.o -Wl,--version-script=$t/b.version \
+   -Wl,--trace-symbol='foo@VER1' > /dev/null
+
+cat <<EOF | $CC -c -o $t/d.o -xc -
+void foo();
+__asm__(".symver foo, foo@VER1");
+int main() { foo(); }
+EOF
+
+$CC -B. -o $t/exe $t/d.o $t/c.so -Wl,--trace-symbol='foo@VER1' > /dev/null
+$QEMU $t/exe

test/elf/version-script20.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+. $(dirname $0)/common.inc
+
+cat <<'EOF' > $t/a.ver
+VER1 { foo*; };
+VER2 { foo_x; };
+EOF
+
+cat <<EOF | $CC -fPIC -c -o $t/b.o -xc -
+void foo_x() {}
+void foo_y() {}
+void foo_z() {}
+EOF
+
+$CC -B. -shared -Wl,--version-script=$t/a.ver -o $t/c.so $t/b.o
+readelf -W --dyn-syms $t/c.so > $t/log
+grep -Fq 'foo_x@@VER2' $t/log
+grep -Fq 'foo_y@@VER1' $t/log
+grep -Fq 'foo_z@@VER1' $t/log

test/elf/version-script21.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+. $(dirname $0)/common.inc
+
+cat <<'EOF' > $t/a.ver
+VER1 { foo_x; };
+VER2 { foo*; };
+EOF
+
+cat <<EOF | $CC -fPIC -c -o $t/b.o -xc -
+void foo_x() {}
+void foo_y() {}
+void foo_z() {}
+EOF
+
+$CC -B. -shared -Wl,--version-script=$t/a.ver -o $t/c.so $t/b.o
+readelf -W --dyn-syms $t/c.so > $t/log
+grep -Fq 'foo_x@@VER1' $t/log
+grep -Fq 'foo_y@@VER2' $t/log
+grep -Fq 'foo_z@@VER2' $t/log

test/elf/version-script22.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+. $(dirname $0)/common.inc
+
+cat <<'EOF' > $t/a.ver
+VER1 { foo*; };
+VER2 { foo*bar*; };
+EOF
+
+cat <<EOF | $CC -fPIC -c -o $t/b.o -xc -
+void foo_bar() {}
+EOF
+
+$CC -B. -shared -Wl,--version-script=$t/a.ver -o $t/c.so $t/b.o
+readelf -W --dyn-syms $t/c.so > $t/log
+grep -Fq 'foo_bar@@VER2' $t/log

test/elf/version-script23.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+. $(dirname $0)/common.inc
+
+cat <<'EOF' > $t/a.ver
+VER1 { foo\?; };
+EOF
+
+cat <<EOF | $CC -c -o $t/b.o -xassembler - >& /dev/null || skip
+.globl "foo?"
+"foo?":
+EOF
+
+$CC -B. -shared -Wl,--version-script=$t/a.ver -o $t/c.so $t/b.o
+readelf -W --dyn-syms $t/c.so > $t/log
+grep -Fq 'foo?@@VER1' $t/log

test/elf/version-script6.sh

@@ -9,10 +9,10 @@ EOF
 cat <<EOF | $CXX -fPIC -c -o $t/b.o -xc -
 int foo = 5;
 int bar = 6;
+int quux = 100;
 EOF
 
-$CC -B. -shared -Wl,--version-script=$t/a.ver \
-  -o $t/c.so $t/b.o
+$CC -B. -shared -Wl,--version-script=$t/a.ver -o $t/c.so $t/b.o
 
 cat <<'EOF' > $t/d.ver
 VER_Y1 { local; *; };

test/elf/weak-export-dso2.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+. $(dirname $0)/common.inc
+
+cat <<EOF | $CC -fPIC -c -o $t/a.o -xc -
+int foo() { return 0; }
+EOF
+
+$CC -B. -o $t/b.so $t/a.o -shared
+
+cat <<EOF | $CC -fPIC -c -o $t/c.o -xc -
+#include <stdio.h>
+
+__attribute__((weak)) int foo();
+
+int main() {
+  printf("%d\n", foo ? foo() : 3);
+}
+EOF
+
+$CC -B. -o $t/d.so $t/c.o $t/b.so -shared
+readelf -W --dyn-syms $t/d.so | grep -q 'WEAK   DEFAULT  UND foo'