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https://github.com/capstone-engine/llvm-capstone.git
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adcdc9cc37
MSVC link.exe allows overriding exports on the cmd-line with exports seen in OBJ directives. The typical case is what is described in #62329. Before this patch, trying to override an export with `/export` or `/def` would generate a duplicate warning. This patches tries to replicate the MSVC behavior. A second override on the cmd-line would still generate the warning. There's still a case which we don't cover: MSVC link.exe is able to demangle an exported OBJ directive function, and match it with a unmangled export function in a .def file. In the meanwhile, one can use the mangled export in the .def to cover that case. This fixes #62329 Differential revision: https://reviews.llvm.org/D149611
881 lines
28 KiB
C++
881 lines
28 KiB
C++
//===- DLL.cpp ------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines various types of chunks for the DLL import or export
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// descriptor tables. They are inherently Windows-specific.
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// You need to read Microsoft PE/COFF spec to understand details
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// about the data structures.
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//
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// If you are not particularly interested in linking against Windows
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// DLL, you can skip this file, and you should still be able to
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// understand the rest of the linker.
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//
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//===----------------------------------------------------------------------===//
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#include "DLL.h"
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#include "COFFLinkerContext.h"
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#include "Chunks.h"
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#include "SymbolTable.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Object/COFF.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/Path.h"
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using namespace llvm;
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using namespace llvm::object;
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using namespace llvm::support::endian;
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using namespace llvm::COFF;
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namespace lld::coff {
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namespace {
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// Import table
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// A chunk for the import descriptor table.
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class HintNameChunk : public NonSectionChunk {
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public:
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HintNameChunk(StringRef n, uint16_t h) : name(n), hint(h) {}
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size_t getSize() const override {
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// Starts with 2 byte Hint field, followed by a null-terminated string,
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// ends with 0 or 1 byte padding.
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return alignTo(name.size() + 3, 2);
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}
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void writeTo(uint8_t *buf) const override {
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memset(buf, 0, getSize());
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write16le(buf, hint);
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memcpy(buf + 2, name.data(), name.size());
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}
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private:
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StringRef name;
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uint16_t hint;
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};
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// A chunk for the import descriptor table.
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class LookupChunk : public NonSectionChunk {
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public:
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explicit LookupChunk(COFFLinkerContext &ctx, Chunk *c)
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: hintName(c), ctx(ctx) {
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setAlignment(ctx.config.wordsize);
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}
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size_t getSize() const override { return ctx.config.wordsize; }
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void writeTo(uint8_t *buf) const override {
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if (ctx.config.is64())
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write64le(buf, hintName->getRVA());
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else
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write32le(buf, hintName->getRVA());
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}
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Chunk *hintName;
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private:
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COFFLinkerContext &ctx;
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};
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// A chunk for the import descriptor table.
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// This chunk represent import-by-ordinal symbols.
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// See Microsoft PE/COFF spec 7.1. Import Header for details.
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class OrdinalOnlyChunk : public NonSectionChunk {
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public:
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explicit OrdinalOnlyChunk(COFFLinkerContext &c, uint16_t v)
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: ordinal(v), ctx(c) {
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setAlignment(ctx.config.wordsize);
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}
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size_t getSize() const override { return ctx.config.wordsize; }
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void writeTo(uint8_t *buf) const override {
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// An import-by-ordinal slot has MSB 1 to indicate that
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// this is import-by-ordinal (and not import-by-name).
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if (ctx.config.is64()) {
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write64le(buf, (1ULL << 63) | ordinal);
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} else {
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write32le(buf, (1ULL << 31) | ordinal);
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}
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}
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uint16_t ordinal;
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private:
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COFFLinkerContext &ctx;
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};
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// A chunk for the import descriptor table.
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class ImportDirectoryChunk : public NonSectionChunk {
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public:
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explicit ImportDirectoryChunk(Chunk *n) : dllName(n) {}
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size_t getSize() const override { return sizeof(ImportDirectoryTableEntry); }
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void writeTo(uint8_t *buf) const override {
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memset(buf, 0, getSize());
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auto *e = (coff_import_directory_table_entry *)(buf);
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e->ImportLookupTableRVA = lookupTab->getRVA();
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e->NameRVA = dllName->getRVA();
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e->ImportAddressTableRVA = addressTab->getRVA();
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}
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Chunk *dllName;
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Chunk *lookupTab;
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Chunk *addressTab;
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};
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// A chunk representing null terminator in the import table.
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// Contents of this chunk is always null bytes.
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class NullChunk : public NonSectionChunk {
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public:
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explicit NullChunk(size_t n) : size(n) { hasData = false; }
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size_t getSize() const override { return size; }
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void writeTo(uint8_t *buf) const override {
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memset(buf, 0, size);
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}
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private:
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size_t size;
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};
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static std::vector<std::vector<DefinedImportData *>>
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binImports(COFFLinkerContext &ctx,
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const std::vector<DefinedImportData *> &imports) {
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// Group DLL-imported symbols by DLL name because that's how
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// symbols are laid out in the import descriptor table.
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auto less = [&ctx](const std::string &a, const std::string &b) {
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return ctx.config.dllOrder[a] < ctx.config.dllOrder[b];
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};
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std::map<std::string, std::vector<DefinedImportData *>, decltype(less)> m(
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less);
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for (DefinedImportData *sym : imports)
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m[sym->getDLLName().lower()].push_back(sym);
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std::vector<std::vector<DefinedImportData *>> v;
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for (auto &kv : m) {
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// Sort symbols by name for each group.
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std::vector<DefinedImportData *> &syms = kv.second;
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llvm::sort(syms, [](DefinedImportData *a, DefinedImportData *b) {
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return a->getName() < b->getName();
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});
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v.push_back(std::move(syms));
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}
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return v;
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}
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// See Microsoft PE/COFF spec 4.3 for details.
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// A chunk for the delay import descriptor table etnry.
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class DelayDirectoryChunk : public NonSectionChunk {
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public:
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explicit DelayDirectoryChunk(Chunk *n) : dllName(n) {}
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size_t getSize() const override {
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return sizeof(delay_import_directory_table_entry);
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}
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void writeTo(uint8_t *buf) const override {
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memset(buf, 0, getSize());
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auto *e = (delay_import_directory_table_entry *)(buf);
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e->Attributes = 1;
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e->Name = dllName->getRVA();
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e->ModuleHandle = moduleHandle->getRVA();
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e->DelayImportAddressTable = addressTab->getRVA();
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e->DelayImportNameTable = nameTab->getRVA();
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}
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Chunk *dllName;
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Chunk *moduleHandle;
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Chunk *addressTab;
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Chunk *nameTab;
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};
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// Initial contents for delay-loaded functions.
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// This code calls __delayLoadHelper2 function to resolve a symbol
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// which then overwrites its jump table slot with the result
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// for subsequent function calls.
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static const uint8_t thunkX64[] = {
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0x48, 0x8D, 0x05, 0, 0, 0, 0, // lea rax, [__imp_<FUNCNAME>]
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0xE9, 0, 0, 0, 0, // jmp __tailMerge_<lib>
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};
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static const uint8_t tailMergeX64[] = {
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0x51, // push rcx
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0x52, // push rdx
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0x41, 0x50, // push r8
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0x41, 0x51, // push r9
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0x48, 0x83, 0xEC, 0x48, // sub rsp, 48h
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0x66, 0x0F, 0x7F, 0x04, 0x24, // movdqa xmmword ptr [rsp], xmm0
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0x66, 0x0F, 0x7F, 0x4C, 0x24, 0x10, // movdqa xmmword ptr [rsp+10h], xmm1
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0x66, 0x0F, 0x7F, 0x54, 0x24, 0x20, // movdqa xmmword ptr [rsp+20h], xmm2
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0x66, 0x0F, 0x7F, 0x5C, 0x24, 0x30, // movdqa xmmword ptr [rsp+30h], xmm3
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0x48, 0x8B, 0xD0, // mov rdx, rax
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0x48, 0x8D, 0x0D, 0, 0, 0, 0, // lea rcx, [___DELAY_IMPORT_...]
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0xE8, 0, 0, 0, 0, // call __delayLoadHelper2
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0x66, 0x0F, 0x6F, 0x04, 0x24, // movdqa xmm0, xmmword ptr [rsp]
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0x66, 0x0F, 0x6F, 0x4C, 0x24, 0x10, // movdqa xmm1, xmmword ptr [rsp+10h]
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0x66, 0x0F, 0x6F, 0x54, 0x24, 0x20, // movdqa xmm2, xmmword ptr [rsp+20h]
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0x66, 0x0F, 0x6F, 0x5C, 0x24, 0x30, // movdqa xmm3, xmmword ptr [rsp+30h]
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0x48, 0x83, 0xC4, 0x48, // add rsp, 48h
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0x41, 0x59, // pop r9
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0x41, 0x58, // pop r8
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0x5A, // pop rdx
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0x59, // pop rcx
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0xFF, 0xE0, // jmp rax
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};
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static const uint8_t tailMergeUnwindInfoX64[] = {
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0x01, // Version=1, Flags=UNW_FLAG_NHANDLER
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0x0a, // Size of prolog
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0x05, // Count of unwind codes
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0x00, // No frame register
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0x0a, 0x82, // Offset 0xa: UWOP_ALLOC_SMALL(0x48)
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0x06, 0x02, // Offset 6: UWOP_ALLOC_SMALL(8)
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0x04, 0x02, // Offset 4: UWOP_ALLOC_SMALL(8)
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0x02, 0x02, // Offset 2: UWOP_ALLOC_SMALL(8)
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0x01, 0x02, // Offset 1: UWOP_ALLOC_SMALL(8)
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0x00, 0x00 // Padding to align on 32-bits
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};
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static const uint8_t thunkX86[] = {
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0xB8, 0, 0, 0, 0, // mov eax, offset ___imp__<FUNCNAME>
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0xE9, 0, 0, 0, 0, // jmp __tailMerge_<lib>
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};
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static const uint8_t tailMergeX86[] = {
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0x51, // push ecx
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0x52, // push edx
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0x50, // push eax
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0x68, 0, 0, 0, 0, // push offset ___DELAY_IMPORT_DESCRIPTOR_<DLLNAME>_dll
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0xE8, 0, 0, 0, 0, // call ___delayLoadHelper2@8
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0x5A, // pop edx
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0x59, // pop ecx
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0xFF, 0xE0, // jmp eax
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};
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static const uint8_t thunkARM[] = {
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0x40, 0xf2, 0x00, 0x0c, // mov.w ip, #0 __imp_<FUNCNAME>
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0xc0, 0xf2, 0x00, 0x0c, // mov.t ip, #0 __imp_<FUNCNAME>
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0x00, 0xf0, 0x00, 0xb8, // b.w __tailMerge_<lib>
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};
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static const uint8_t tailMergeARM[] = {
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0x2d, 0xe9, 0x0f, 0x48, // push.w {r0, r1, r2, r3, r11, lr}
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0x0d, 0xf2, 0x10, 0x0b, // addw r11, sp, #16
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0x2d, 0xed, 0x10, 0x0b, // vpush {d0, d1, d2, d3, d4, d5, d6, d7}
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0x61, 0x46, // mov r1, ip
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0x40, 0xf2, 0x00, 0x00, // mov.w r0, #0 DELAY_IMPORT_DESCRIPTOR
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0xc0, 0xf2, 0x00, 0x00, // mov.t r0, #0 DELAY_IMPORT_DESCRIPTOR
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0x00, 0xf0, 0x00, 0xd0, // bl #0 __delayLoadHelper2
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0x84, 0x46, // mov ip, r0
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0xbd, 0xec, 0x10, 0x0b, // vpop {d0, d1, d2, d3, d4, d5, d6, d7}
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0xbd, 0xe8, 0x0f, 0x48, // pop.w {r0, r1, r2, r3, r11, lr}
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0x60, 0x47, // bx ip
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};
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static const uint8_t thunkARM64[] = {
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0x11, 0x00, 0x00, 0x90, // adrp x17, #0 __imp_<FUNCNAME>
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0x31, 0x02, 0x00, 0x91, // add x17, x17, #0 :lo12:__imp_<FUNCNAME>
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0x00, 0x00, 0x00, 0x14, // b __tailMerge_<lib>
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};
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static const uint8_t tailMergeARM64[] = {
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0xfd, 0x7b, 0xb3, 0xa9, // stp x29, x30, [sp, #-208]!
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0xfd, 0x03, 0x00, 0x91, // mov x29, sp
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0xe0, 0x07, 0x01, 0xa9, // stp x0, x1, [sp, #16]
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0xe2, 0x0f, 0x02, 0xa9, // stp x2, x3, [sp, #32]
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0xe4, 0x17, 0x03, 0xa9, // stp x4, x5, [sp, #48]
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0xe6, 0x1f, 0x04, 0xa9, // stp x6, x7, [sp, #64]
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0xe0, 0x87, 0x02, 0xad, // stp q0, q1, [sp, #80]
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0xe2, 0x8f, 0x03, 0xad, // stp q2, q3, [sp, #112]
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0xe4, 0x97, 0x04, 0xad, // stp q4, q5, [sp, #144]
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0xe6, 0x9f, 0x05, 0xad, // stp q6, q7, [sp, #176]
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0xe1, 0x03, 0x11, 0xaa, // mov x1, x17
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0x00, 0x00, 0x00, 0x90, // adrp x0, #0 DELAY_IMPORT_DESCRIPTOR
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0x00, 0x00, 0x00, 0x91, // add x0, x0, #0 :lo12:DELAY_IMPORT_DESCRIPTOR
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0x00, 0x00, 0x00, 0x94, // bl #0 __delayLoadHelper2
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0xf0, 0x03, 0x00, 0xaa, // mov x16, x0
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0xe6, 0x9f, 0x45, 0xad, // ldp q6, q7, [sp, #176]
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0xe4, 0x97, 0x44, 0xad, // ldp q4, q5, [sp, #144]
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0xe2, 0x8f, 0x43, 0xad, // ldp q2, q3, [sp, #112]
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0xe0, 0x87, 0x42, 0xad, // ldp q0, q1, [sp, #80]
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0xe6, 0x1f, 0x44, 0xa9, // ldp x6, x7, [sp, #64]
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0xe4, 0x17, 0x43, 0xa9, // ldp x4, x5, [sp, #48]
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0xe2, 0x0f, 0x42, 0xa9, // ldp x2, x3, [sp, #32]
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0xe0, 0x07, 0x41, 0xa9, // ldp x0, x1, [sp, #16]
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0xfd, 0x7b, 0xcd, 0xa8, // ldp x29, x30, [sp], #208
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0x00, 0x02, 0x1f, 0xd6, // br x16
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};
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// A chunk for the delay import thunk.
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class ThunkChunkX64 : public NonSectionChunk {
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public:
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ThunkChunkX64(Defined *i, Chunk *tm) : imp(i), tailMerge(tm) {}
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size_t getSize() const override { return sizeof(thunkX64); }
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void writeTo(uint8_t *buf) const override {
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memcpy(buf, thunkX64, sizeof(thunkX64));
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write32le(buf + 3, imp->getRVA() - rva - 7);
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write32le(buf + 8, tailMerge->getRVA() - rva - 12);
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}
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Defined *imp = nullptr;
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Chunk *tailMerge = nullptr;
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};
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class TailMergeChunkX64 : public NonSectionChunk {
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public:
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TailMergeChunkX64(Chunk *d, Defined *h) : desc(d), helper(h) {}
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size_t getSize() const override { return sizeof(tailMergeX64); }
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void writeTo(uint8_t *buf) const override {
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memcpy(buf, tailMergeX64, sizeof(tailMergeX64));
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write32le(buf + 39, desc->getRVA() - rva - 43);
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write32le(buf + 44, helper->getRVA() - rva - 48);
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}
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Chunk *desc = nullptr;
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Defined *helper = nullptr;
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};
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class TailMergePDataChunkX64 : public NonSectionChunk {
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public:
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TailMergePDataChunkX64(Chunk *tm, Chunk *unwind) : tm(tm), unwind(unwind) {
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// See
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// https://learn.microsoft.com/en-us/cpp/build/exception-handling-x64#struct-runtime_function
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setAlignment(4);
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}
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size_t getSize() const override { return 3 * sizeof(uint32_t); }
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void writeTo(uint8_t *buf) const override {
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write32le(buf + 0, tm->getRVA()); // TailMergeChunk start RVA
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write32le(buf + 4, tm->getRVA() + tm->getSize()); // TailMergeChunk stop RVA
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write32le(buf + 8, unwind->getRVA()); // UnwindInfo RVA
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}
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Chunk *tm = nullptr;
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Chunk *unwind = nullptr;
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};
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class TailMergeUnwindInfoX64 : public NonSectionChunk {
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public:
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TailMergeUnwindInfoX64() {
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// See
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// https://learn.microsoft.com/en-us/cpp/build/exception-handling-x64#struct-unwind_info
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setAlignment(4);
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}
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size_t getSize() const override { return sizeof(tailMergeUnwindInfoX64); }
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void writeTo(uint8_t *buf) const override {
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memcpy(buf, tailMergeUnwindInfoX64, sizeof(tailMergeUnwindInfoX64));
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}
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};
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class ThunkChunkX86 : public NonSectionChunk {
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public:
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ThunkChunkX86(COFFLinkerContext &ctx, Defined *i, Chunk *tm)
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: imp(i), tailMerge(tm), ctx(ctx) {}
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size_t getSize() const override { return sizeof(thunkX86); }
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void writeTo(uint8_t *buf) const override {
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memcpy(buf, thunkX86, sizeof(thunkX86));
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write32le(buf + 1, imp->getRVA() + ctx.config.imageBase);
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write32le(buf + 6, tailMerge->getRVA() - rva - 10);
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}
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void getBaserels(std::vector<Baserel> *res) override {
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res->emplace_back(rva + 1, ctx.config.machine);
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}
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Defined *imp = nullptr;
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Chunk *tailMerge = nullptr;
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private:
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const COFFLinkerContext &ctx;
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};
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class TailMergeChunkX86 : public NonSectionChunk {
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public:
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TailMergeChunkX86(COFFLinkerContext &ctx, Chunk *d, Defined *h)
|
|
: desc(d), helper(h), ctx(ctx) {}
|
|
|
|
size_t getSize() const override { return sizeof(tailMergeX86); }
|
|
|
|
void writeTo(uint8_t *buf) const override {
|
|
memcpy(buf, tailMergeX86, sizeof(tailMergeX86));
|
|
write32le(buf + 4, desc->getRVA() + ctx.config.imageBase);
|
|
write32le(buf + 9, helper->getRVA() - rva - 13);
|
|
}
|
|
|
|
void getBaserels(std::vector<Baserel> *res) override {
|
|
res->emplace_back(rva + 4, ctx.config.machine);
|
|
}
|
|
|
|
Chunk *desc = nullptr;
|
|
Defined *helper = nullptr;
|
|
|
|
private:
|
|
const COFFLinkerContext &ctx;
|
|
};
|
|
|
|
class ThunkChunkARM : public NonSectionChunk {
|
|
public:
|
|
ThunkChunkARM(COFFLinkerContext &ctx, Defined *i, Chunk *tm)
|
|
: imp(i), tailMerge(tm), ctx(ctx) {
|
|
setAlignment(2);
|
|
}
|
|
|
|
size_t getSize() const override { return sizeof(thunkARM); }
|
|
|
|
void writeTo(uint8_t *buf) const override {
|
|
memcpy(buf, thunkARM, sizeof(thunkARM));
|
|
applyMOV32T(buf + 0, imp->getRVA() + ctx.config.imageBase);
|
|
applyBranch24T(buf + 8, tailMerge->getRVA() - rva - 12);
|
|
}
|
|
|
|
void getBaserels(std::vector<Baserel> *res) override {
|
|
res->emplace_back(rva + 0, IMAGE_REL_BASED_ARM_MOV32T);
|
|
}
|
|
|
|
Defined *imp = nullptr;
|
|
Chunk *tailMerge = nullptr;
|
|
|
|
private:
|
|
const COFFLinkerContext &ctx;
|
|
};
|
|
|
|
class TailMergeChunkARM : public NonSectionChunk {
|
|
public:
|
|
TailMergeChunkARM(COFFLinkerContext &ctx, Chunk *d, Defined *h)
|
|
: desc(d), helper(h), ctx(ctx) {
|
|
setAlignment(2);
|
|
}
|
|
|
|
size_t getSize() const override { return sizeof(tailMergeARM); }
|
|
|
|
void writeTo(uint8_t *buf) const override {
|
|
memcpy(buf, tailMergeARM, sizeof(tailMergeARM));
|
|
applyMOV32T(buf + 14, desc->getRVA() + ctx.config.imageBase);
|
|
applyBranch24T(buf + 22, helper->getRVA() - rva - 26);
|
|
}
|
|
|
|
void getBaserels(std::vector<Baserel> *res) override {
|
|
res->emplace_back(rva + 14, IMAGE_REL_BASED_ARM_MOV32T);
|
|
}
|
|
|
|
Chunk *desc = nullptr;
|
|
Defined *helper = nullptr;
|
|
|
|
private:
|
|
const COFFLinkerContext &ctx;
|
|
};
|
|
|
|
class ThunkChunkARM64 : public NonSectionChunk {
|
|
public:
|
|
ThunkChunkARM64(Defined *i, Chunk *tm) : imp(i), tailMerge(tm) {
|
|
setAlignment(4);
|
|
}
|
|
|
|
size_t getSize() const override { return sizeof(thunkARM64); }
|
|
|
|
void writeTo(uint8_t *buf) const override {
|
|
memcpy(buf, thunkARM64, sizeof(thunkARM64));
|
|
applyArm64Addr(buf + 0, imp->getRVA(), rva + 0, 12);
|
|
applyArm64Imm(buf + 4, imp->getRVA() & 0xfff, 0);
|
|
applyArm64Branch26(buf + 8, tailMerge->getRVA() - rva - 8);
|
|
}
|
|
|
|
Defined *imp = nullptr;
|
|
Chunk *tailMerge = nullptr;
|
|
};
|
|
|
|
class TailMergeChunkARM64 : public NonSectionChunk {
|
|
public:
|
|
TailMergeChunkARM64(Chunk *d, Defined *h) : desc(d), helper(h) {
|
|
setAlignment(4);
|
|
}
|
|
|
|
size_t getSize() const override { return sizeof(tailMergeARM64); }
|
|
|
|
void writeTo(uint8_t *buf) const override {
|
|
memcpy(buf, tailMergeARM64, sizeof(tailMergeARM64));
|
|
applyArm64Addr(buf + 44, desc->getRVA(), rva + 44, 12);
|
|
applyArm64Imm(buf + 48, desc->getRVA() & 0xfff, 0);
|
|
applyArm64Branch26(buf + 52, helper->getRVA() - rva - 52);
|
|
}
|
|
|
|
Chunk *desc = nullptr;
|
|
Defined *helper = nullptr;
|
|
};
|
|
|
|
// A chunk for the import descriptor table.
|
|
class DelayAddressChunk : public NonSectionChunk {
|
|
public:
|
|
explicit DelayAddressChunk(COFFLinkerContext &ctx, Chunk *c)
|
|
: thunk(c), ctx(ctx) {
|
|
setAlignment(ctx.config.wordsize);
|
|
}
|
|
size_t getSize() const override { return ctx.config.wordsize; }
|
|
|
|
void writeTo(uint8_t *buf) const override {
|
|
if (ctx.config.is64()) {
|
|
write64le(buf, thunk->getRVA() + ctx.config.imageBase);
|
|
} else {
|
|
uint32_t bit = 0;
|
|
// Pointer to thumb code must have the LSB set, so adjust it.
|
|
if (ctx.config.machine == ARMNT)
|
|
bit = 1;
|
|
write32le(buf, (thunk->getRVA() + ctx.config.imageBase) | bit);
|
|
}
|
|
}
|
|
|
|
void getBaserels(std::vector<Baserel> *res) override {
|
|
res->emplace_back(rva, ctx.config.machine);
|
|
}
|
|
|
|
Chunk *thunk;
|
|
|
|
private:
|
|
const COFFLinkerContext &ctx;
|
|
};
|
|
|
|
// Export table
|
|
// Read Microsoft PE/COFF spec 5.3 for details.
|
|
|
|
// A chunk for the export descriptor table.
|
|
class ExportDirectoryChunk : public NonSectionChunk {
|
|
public:
|
|
ExportDirectoryChunk(int baseOrdinal, int maxOrdinal, int nameTabSize,
|
|
Chunk *d, Chunk *a, Chunk *n, Chunk *o)
|
|
: baseOrdinal(baseOrdinal), maxOrdinal(maxOrdinal),
|
|
nameTabSize(nameTabSize), dllName(d), addressTab(a), nameTab(n),
|
|
ordinalTab(o) {}
|
|
|
|
size_t getSize() const override {
|
|
return sizeof(export_directory_table_entry);
|
|
}
|
|
|
|
void writeTo(uint8_t *buf) const override {
|
|
memset(buf, 0, getSize());
|
|
|
|
auto *e = (export_directory_table_entry *)(buf);
|
|
e->NameRVA = dllName->getRVA();
|
|
e->OrdinalBase = baseOrdinal;
|
|
e->AddressTableEntries = (maxOrdinal - baseOrdinal) + 1;
|
|
e->NumberOfNamePointers = nameTabSize;
|
|
e->ExportAddressTableRVA = addressTab->getRVA();
|
|
e->NamePointerRVA = nameTab->getRVA();
|
|
e->OrdinalTableRVA = ordinalTab->getRVA();
|
|
}
|
|
|
|
uint16_t baseOrdinal;
|
|
uint16_t maxOrdinal;
|
|
uint16_t nameTabSize;
|
|
Chunk *dllName;
|
|
Chunk *addressTab;
|
|
Chunk *nameTab;
|
|
Chunk *ordinalTab;
|
|
};
|
|
|
|
class AddressTableChunk : public NonSectionChunk {
|
|
public:
|
|
explicit AddressTableChunk(COFFLinkerContext &ctx, size_t baseOrdinal,
|
|
size_t maxOrdinal)
|
|
: baseOrdinal(baseOrdinal), size((maxOrdinal - baseOrdinal) + 1),
|
|
ctx(ctx) {}
|
|
size_t getSize() const override { return size * 4; }
|
|
|
|
void writeTo(uint8_t *buf) const override {
|
|
memset(buf, 0, getSize());
|
|
|
|
for (const Export &e : ctx.config.exports) {
|
|
assert(e.ordinal >= baseOrdinal && "Export symbol has invalid ordinal");
|
|
// Subtract the OrdinalBase to get the index.
|
|
uint8_t *p = buf + (e.ordinal - baseOrdinal) * 4;
|
|
uint32_t bit = 0;
|
|
// Pointer to thumb code must have the LSB set, so adjust it.
|
|
if (ctx.config.machine == ARMNT && !e.data)
|
|
bit = 1;
|
|
if (e.forwardChunk) {
|
|
write32le(p, e.forwardChunk->getRVA() | bit);
|
|
} else {
|
|
assert(cast<Defined>(e.sym)->getRVA() != 0 &&
|
|
"Exported symbol unmapped");
|
|
write32le(p, cast<Defined>(e.sym)->getRVA() | bit);
|
|
}
|
|
}
|
|
}
|
|
|
|
private:
|
|
size_t baseOrdinal;
|
|
size_t size;
|
|
const COFFLinkerContext &ctx;
|
|
};
|
|
|
|
class NamePointersChunk : public NonSectionChunk {
|
|
public:
|
|
explicit NamePointersChunk(std::vector<Chunk *> &v) : chunks(v) {}
|
|
size_t getSize() const override { return chunks.size() * 4; }
|
|
|
|
void writeTo(uint8_t *buf) const override {
|
|
for (Chunk *c : chunks) {
|
|
write32le(buf, c->getRVA());
|
|
buf += 4;
|
|
}
|
|
}
|
|
|
|
private:
|
|
std::vector<Chunk *> chunks;
|
|
};
|
|
|
|
class ExportOrdinalChunk : public NonSectionChunk {
|
|
public:
|
|
explicit ExportOrdinalChunk(const COFFLinkerContext &ctx, size_t baseOrdinal,
|
|
size_t tableSize)
|
|
: baseOrdinal(baseOrdinal), size(tableSize), ctx(ctx) {}
|
|
size_t getSize() const override { return size * 2; }
|
|
|
|
void writeTo(uint8_t *buf) const override {
|
|
for (const Export &e : ctx.config.exports) {
|
|
if (e.noname)
|
|
continue;
|
|
assert(e.ordinal >= baseOrdinal && "Export symbol has invalid ordinal");
|
|
// This table stores unbiased indices, so subtract OrdinalBase.
|
|
write16le(buf, e.ordinal - baseOrdinal);
|
|
buf += 2;
|
|
}
|
|
}
|
|
|
|
private:
|
|
size_t baseOrdinal;
|
|
size_t size;
|
|
const COFFLinkerContext &ctx;
|
|
};
|
|
|
|
} // anonymous namespace
|
|
|
|
void IdataContents::create(COFFLinkerContext &ctx) {
|
|
std::vector<std::vector<DefinedImportData *>> v = binImports(ctx, imports);
|
|
|
|
// Create .idata contents for each DLL.
|
|
for (std::vector<DefinedImportData *> &syms : v) {
|
|
// Create lookup and address tables. If they have external names,
|
|
// we need to create hintName chunks to store the names.
|
|
// If they don't (if they are import-by-ordinals), we store only
|
|
// ordinal values to the table.
|
|
size_t base = lookups.size();
|
|
for (DefinedImportData *s : syms) {
|
|
uint16_t ord = s->getOrdinal();
|
|
if (s->getExternalName().empty()) {
|
|
lookups.push_back(make<OrdinalOnlyChunk>(ctx, ord));
|
|
addresses.push_back(make<OrdinalOnlyChunk>(ctx, ord));
|
|
continue;
|
|
}
|
|
auto *c = make<HintNameChunk>(s->getExternalName(), ord);
|
|
lookups.push_back(make<LookupChunk>(ctx, c));
|
|
addresses.push_back(make<LookupChunk>(ctx, c));
|
|
hints.push_back(c);
|
|
}
|
|
// Terminate with null values.
|
|
lookups.push_back(make<NullChunk>(ctx.config.wordsize));
|
|
addresses.push_back(make<NullChunk>(ctx.config.wordsize));
|
|
|
|
for (int i = 0, e = syms.size(); i < e; ++i)
|
|
syms[i]->setLocation(addresses[base + i]);
|
|
|
|
// Create the import table header.
|
|
dllNames.push_back(make<StringChunk>(syms[0]->getDLLName()));
|
|
auto *dir = make<ImportDirectoryChunk>(dllNames.back());
|
|
dir->lookupTab = lookups[base];
|
|
dir->addressTab = addresses[base];
|
|
dirs.push_back(dir);
|
|
}
|
|
// Add null terminator.
|
|
dirs.push_back(make<NullChunk>(sizeof(ImportDirectoryTableEntry)));
|
|
}
|
|
|
|
std::vector<Chunk *> DelayLoadContents::getChunks() {
|
|
std::vector<Chunk *> v;
|
|
v.insert(v.end(), dirs.begin(), dirs.end());
|
|
v.insert(v.end(), names.begin(), names.end());
|
|
v.insert(v.end(), hintNames.begin(), hintNames.end());
|
|
v.insert(v.end(), dllNames.begin(), dllNames.end());
|
|
return v;
|
|
}
|
|
|
|
std::vector<Chunk *> DelayLoadContents::getDataChunks() {
|
|
std::vector<Chunk *> v;
|
|
v.insert(v.end(), moduleHandles.begin(), moduleHandles.end());
|
|
v.insert(v.end(), addresses.begin(), addresses.end());
|
|
return v;
|
|
}
|
|
|
|
uint64_t DelayLoadContents::getDirSize() {
|
|
return dirs.size() * sizeof(delay_import_directory_table_entry);
|
|
}
|
|
|
|
void DelayLoadContents::create(Defined *h) {
|
|
helper = h;
|
|
std::vector<std::vector<DefinedImportData *>> v = binImports(ctx, imports);
|
|
|
|
Chunk *unwind = newTailMergeUnwindInfoChunk();
|
|
|
|
// Create .didat contents for each DLL.
|
|
for (std::vector<DefinedImportData *> &syms : v) {
|
|
// Create the delay import table header.
|
|
dllNames.push_back(make<StringChunk>(syms[0]->getDLLName()));
|
|
auto *dir = make<DelayDirectoryChunk>(dllNames.back());
|
|
|
|
size_t base = addresses.size();
|
|
Chunk *tm = newTailMergeChunk(dir);
|
|
Chunk *pdataChunk = unwind ? newTailMergePDataChunk(tm, unwind) : nullptr;
|
|
for (DefinedImportData *s : syms) {
|
|
Chunk *t = newThunkChunk(s, tm);
|
|
auto *a = make<DelayAddressChunk>(ctx, t);
|
|
addresses.push_back(a);
|
|
thunks.push_back(t);
|
|
StringRef extName = s->getExternalName();
|
|
if (extName.empty()) {
|
|
names.push_back(make<OrdinalOnlyChunk>(ctx, s->getOrdinal()));
|
|
} else {
|
|
auto *c = make<HintNameChunk>(extName, 0);
|
|
names.push_back(make<LookupChunk>(ctx, c));
|
|
hintNames.push_back(c);
|
|
// Add a synthetic symbol for this load thunk, using the "__imp___load"
|
|
// prefix, in case this thunk needs to be added to the list of valid
|
|
// call targets for Control Flow Guard.
|
|
StringRef symName = saver().save("__imp___load_" + extName);
|
|
s->loadThunkSym =
|
|
cast<DefinedSynthetic>(ctx.symtab.addSynthetic(symName, t));
|
|
}
|
|
}
|
|
thunks.push_back(tm);
|
|
if (pdataChunk)
|
|
pdata.push_back(pdataChunk);
|
|
StringRef tmName =
|
|
saver().save("__tailMerge_" + syms[0]->getDLLName().lower());
|
|
ctx.symtab.addSynthetic(tmName, tm);
|
|
// Terminate with null values.
|
|
addresses.push_back(make<NullChunk>(8));
|
|
names.push_back(make<NullChunk>(8));
|
|
|
|
for (int i = 0, e = syms.size(); i < e; ++i)
|
|
syms[i]->setLocation(addresses[base + i]);
|
|
auto *mh = make<NullChunk>(8);
|
|
mh->setAlignment(8);
|
|
moduleHandles.push_back(mh);
|
|
|
|
// Fill the delay import table header fields.
|
|
dir->moduleHandle = mh;
|
|
dir->addressTab = addresses[base];
|
|
dir->nameTab = names[base];
|
|
dirs.push_back(dir);
|
|
}
|
|
|
|
if (unwind)
|
|
unwindinfo.push_back(unwind);
|
|
// Add null terminator.
|
|
dirs.push_back(make<NullChunk>(sizeof(delay_import_directory_table_entry)));
|
|
}
|
|
|
|
Chunk *DelayLoadContents::newTailMergeChunk(Chunk *dir) {
|
|
switch (ctx.config.machine) {
|
|
case AMD64:
|
|
return make<TailMergeChunkX64>(dir, helper);
|
|
case I386:
|
|
return make<TailMergeChunkX86>(ctx, dir, helper);
|
|
case ARMNT:
|
|
return make<TailMergeChunkARM>(ctx, dir, helper);
|
|
case ARM64:
|
|
return make<TailMergeChunkARM64>(dir, helper);
|
|
default:
|
|
llvm_unreachable("unsupported machine type");
|
|
}
|
|
}
|
|
|
|
Chunk *DelayLoadContents::newTailMergeUnwindInfoChunk() {
|
|
switch (ctx.config.machine) {
|
|
case AMD64:
|
|
return make<TailMergeUnwindInfoX64>();
|
|
// FIXME: Add support for other architectures.
|
|
default:
|
|
return nullptr; // Just don't generate unwind info.
|
|
}
|
|
}
|
|
Chunk *DelayLoadContents::newTailMergePDataChunk(Chunk *tm, Chunk *unwind) {
|
|
switch (ctx.config.machine) {
|
|
case AMD64:
|
|
return make<TailMergePDataChunkX64>(tm, unwind);
|
|
// FIXME: Add support for other architectures.
|
|
default:
|
|
return nullptr; // Just don't generate unwind info.
|
|
}
|
|
}
|
|
|
|
Chunk *DelayLoadContents::newThunkChunk(DefinedImportData *s,
|
|
Chunk *tailMerge) {
|
|
switch (ctx.config.machine) {
|
|
case AMD64:
|
|
return make<ThunkChunkX64>(s, tailMerge);
|
|
case I386:
|
|
return make<ThunkChunkX86>(ctx, s, tailMerge);
|
|
case ARMNT:
|
|
return make<ThunkChunkARM>(ctx, s, tailMerge);
|
|
case ARM64:
|
|
return make<ThunkChunkARM64>(s, tailMerge);
|
|
default:
|
|
llvm_unreachable("unsupported machine type");
|
|
}
|
|
}
|
|
|
|
EdataContents::EdataContents(COFFLinkerContext &ctx) : ctx(ctx) {
|
|
unsigned baseOrdinal = 1 << 16, maxOrdinal = 0;
|
|
for (Export &e : ctx.config.exports) {
|
|
baseOrdinal = std::min(baseOrdinal, (unsigned)e.ordinal);
|
|
maxOrdinal = std::max(maxOrdinal, (unsigned)e.ordinal);
|
|
}
|
|
// Ordinals must start at 1 as suggested in:
|
|
// https://learn.microsoft.com/en-us/cpp/build/reference/export-exports-a-function?view=msvc-170
|
|
assert(baseOrdinal >= 1);
|
|
|
|
auto *dllName = make<StringChunk>(sys::path::filename(ctx.config.outputFile));
|
|
auto *addressTab = make<AddressTableChunk>(ctx, baseOrdinal, maxOrdinal);
|
|
std::vector<Chunk *> names;
|
|
for (Export &e : ctx.config.exports)
|
|
if (!e.noname)
|
|
names.push_back(make<StringChunk>(e.exportName));
|
|
|
|
std::vector<Chunk *> forwards;
|
|
for (Export &e : ctx.config.exports) {
|
|
if (e.forwardTo.empty())
|
|
continue;
|
|
e.forwardChunk = make<StringChunk>(e.forwardTo);
|
|
forwards.push_back(e.forwardChunk);
|
|
}
|
|
|
|
auto *nameTab = make<NamePointersChunk>(names);
|
|
auto *ordinalTab = make<ExportOrdinalChunk>(ctx, baseOrdinal, names.size());
|
|
auto *dir =
|
|
make<ExportDirectoryChunk>(baseOrdinal, maxOrdinal, names.size(), dllName,
|
|
addressTab, nameTab, ordinalTab);
|
|
chunks.push_back(dir);
|
|
chunks.push_back(dllName);
|
|
chunks.push_back(addressTab);
|
|
chunks.push_back(nameTab);
|
|
chunks.push_back(ordinalTab);
|
|
chunks.insert(chunks.end(), names.begin(), names.end());
|
|
chunks.insert(chunks.end(), forwards.begin(), forwards.end());
|
|
}
|
|
|
|
} // namespace lld::coff
|