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[ELF] Accept first SHT_ARM_ATTRIBUTES section
The eglibc library, as used by Ubuntu 14.04 requires the presence of an
SHT_ARM_ATTRIBUTES section in for the purposes of checking hard/soft float
compatibility when dlopen() is used. Unfortunately when the section is not
present dlopen() fails with a generic could not find file message.
This change makes lld keep the first .ARM.attributes section that it
encounters and propagates it to the output. This is not a complete
SHT_ARM_ATTRIBUTES implementation, that would involve reading the contents
of the section and joining each individual attribute. It should suffice
for a homogenous build all libraries and executables on the same system
with a compatible set of command line options.
Differential revision: https://reviews.llvm.org/D27718
llvm-svn: 289642
This commit is contained in:
Peter Smith
parent
3abd1d3e12
commit
532bc984f5
@ -14,6 +14,7 @@
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#include "LinkerScript.h"
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#include "SymbolTable.h"
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#include "Symbols.h"
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#include "SyntheticSections.h"
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#include "lld/Support/Memory.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Bitcode/BitcodeReader.h"
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@ -336,8 +337,14 @@ elf::ObjectFile<ELFT>::createInputSection(const Elf_Shdr &Sec,
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switch (Sec.sh_type) {
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case SHT_ARM_ATTRIBUTES:
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// FIXME: ARM meta-data section. At present attributes are ignored,
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// they can be used to reason about object compatibility.
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// FIXME: ARM meta-data section. Retain the first attribute section
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// we see. The eglibc ARM dynamic loaders require the presence of an
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// attribute section for dlopen to work.
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// In a full implementation we would merge all attribute sections.
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if (In<ELFT>::ARMAttributes == nullptr) {
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In<ELFT>::ARMAttributes = make<InputSection<ELFT>>(this, &Sec, Name);
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return In<ELFT>::ARMAttributes;
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}
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return &InputSection<ELFT>::Discarded;
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case SHT_RELA:
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case SHT_REL: {
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@ -667,6 +667,7 @@ template <class ELFT> MergeInputSection<ELFT> *createCommentSection();
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// Linker generated sections which can be used as inputs.
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template <class ELFT> struct In {
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static InputSection<ELFT> *ARMAttributes;
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static BuildIdSection<ELFT> *BuildId;
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static InputSection<ELFT> *Common;
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static DynamicSection<ELFT> *Dynamic;
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@ -695,6 +696,7 @@ template <class ELFT> struct In {
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static VersionNeedSection<ELFT> *VerNeed;
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};
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template <class ELFT> InputSection<ELFT> *In<ELFT>::ARMAttributes;
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template <class ELFT> BuildIdSection<ELFT> *In<ELFT>::BuildId;
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template <class ELFT> InputSection<ELFT> *In<ELFT>::Common;
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template <class ELFT> DynamicSection<ELFT> *In<ELFT>::Dynamic;
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@ -1,20 +1,4 @@
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// RUN: llvm-mc -filetype=obj -triple=armv7a-none-linux-gnueabi %s -o %t.o
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// RUN: ld.lld %t.o -o %t
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// RUN: llvm-readobj -s %t | FileCheck %s
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// RUN: ld.lld %t.o -shared -o %t2
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// RUN: llvm-readobj -s %t2 | FileCheck %s
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// RUN: ld.lld %t.o -r -o %t3
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// RUN: llvm-readobj -s %t3 | FileCheck %s
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// The .ARM.attributes section should be removed from executables and
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// shared objects.
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// At present we remove it from the -r object output as well which isn't ideal.
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// Unfortunately combining per-object attributes cannot be safely done by just
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// concatentation of input sections.
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// CHECK-NOT: Name: .ARM.attributes
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// REQUIRES: arm
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// Input that generates an object with a populated SHT_ARM_ATTRIBUTES section
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.text
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.syntax unified
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.eabi_attribute 67, "2.09" @ Tag_conformance
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@ -38,8 +22,8 @@
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.eabi_attribute 26, 2 @ Tag_ABI_enum_size
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.eabi_attribute 14, 0 @ Tag_ABI_PCS_R9_use
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.eabi_attribute 68, 1 @ Tag_Virtualization_use
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.globl _start
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.globl func
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.p2align 2
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.type _start,%function
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_start:
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.type func,%function
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func:
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bx lr
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183
lld/test/ELF/arm-attributes.s
Normal file
183
lld/test/ELF/arm-attributes.s
Normal file
@ -0,0 +1,183 @@
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// RUN: llvm-mc -filetype=obj -triple=armv7a-none-linux-gnueabi %S/Inputs/arm-attributes1.s -o %t1.o
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// RUN: llvm-mc -filetype=obj -triple=armv7a-none-linux-gnueabi %s -o %t2.o
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// RUN: ld.lld %t1.o %t2.o -o %t
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// RUN: llvm-readobj -arm-attributes %t | FileCheck %s
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// RUN: ld.lld %t1.o %t2.o -shared -o %t2
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// RUN: llvm-readobj -arm-attributes %t2 | FileCheck %s
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// RUN: ld.lld %t1.o %t2.o -r -o %t3
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// RUN: llvm-readobj -arm-attributes %t3 | FileCheck %s
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// REQUIRES: arm
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// Check that we retain only 1 SHT_ARM_ATTRIBUTES section. At present we do not
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// try and merge or use the contents of SHT_ARM_ATTRIBUTES sections. We just
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// pass the first one through.
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.text
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.syntax unified
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.eabi_attribute 67, "2.09" @ Tag_conformance
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.cpu cortex-a8
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.eabi_attribute 6, 10 @ Tag_CPU_arch
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.eabi_attribute 7, 65 @ Tag_CPU_arch_profile
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.eabi_attribute 8, 1 @ Tag_ARM_ISA_use
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.eabi_attribute 9, 2 @ Tag_THUMB_ISA_use
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.fpu neon
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.eabi_attribute 15, 1 @ Tag_ABI_PCS_RW_data
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.eabi_attribute 16, 1 @ Tag_ABI_PCS_RO_data
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.eabi_attribute 17, 2 @ Tag_ABI_PCS_GOT_use
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.eabi_attribute 20, 1 @ Tag_ABI_FP_denormal
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.eabi_attribute 21, 1 @ Tag_ABI_FP_exceptions
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.eabi_attribute 23, 3 @ Tag_ABI_FP_number_model
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.eabi_attribute 34, 1 @ Tag_CPU_unaligned_access
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.eabi_attribute 24, 1 @ Tag_ABI_align_needed
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.eabi_attribute 25, 1 @ Tag_ABI_align_preserved
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.eabi_attribute 38, 1 @ Tag_ABI_FP_16bit_format
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.eabi_attribute 18, 4 @ Tag_ABI_PCS_wchar_t
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.eabi_attribute 26, 2 @ Tag_ABI_enum_size
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.eabi_attribute 14, 0 @ Tag_ABI_PCS_R9_use
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.eabi_attribute 68, 1 @ Tag_Virtualization_use
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.globl _start
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.p2align 2
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.type _start,%function
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_start:
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.globl func
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bl func
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bx lr
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// CHECK: BuildAttributes {
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// CHECK-NEXT: FormatVersion: 0x41
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// CHECK-NEXT: Section 1 {
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// CHECK-NEXT: SectionLength: 72
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// CHECK-NEXT: Vendor: aeabi
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// CHECK-NEXT: Tag: Tag_File (0x1)
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// CHECK-NEXT: Size: 62
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// CHECK-NEXT: FileAttributes {
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// CHECK-NEXT: Attribute {
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// CHECK-NEXT: Tag: 67
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// CHECK-NEXT: TagName: conformance
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// CHECK-NEXT: Value: 2.09
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// CHECK-NEXT: }
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// CHECK-NEXT: Attribute {
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// CHECK-NEXT: Tag: 5
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// CHECK-NEXT: TagName: CPU_name
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// CHECK-NEXT: Value: cortex-a8
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// CHECK-NEXT: }
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// CHECK-NEXT: Attribute {
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// CHECK-NEXT: Tag: 6
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// CHECK-NEXT: Value: 10
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// CHECK-NEXT: TagName: CPU_arch
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// CHECK-NEXT: Description: ARM v7
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// CHECK-NEXT: }
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// CHECK-NEXT: Attribute {
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// CHECK-NEXT: Tag: 7
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// CHECK-NEXT: Value: 65
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// CHECK-NEXT: TagName: CPU_arch_profile
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// CHECK-NEXT: Description: Application
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// CHECK-NEXT: }
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// CHECK-NEXT: Attribute {
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// CHECK-NEXT: Tag: 8
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// CHECK-NEXT: Value: 1
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// CHECK-NEXT: TagName: ARM_ISA_use
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// CHECK-NEXT: Description: Permitted
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// CHECK-NEXT: }
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// CHECK-NEXT: Attribute {
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// CHECK-NEXT: Tag: 9
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// CHECK-NEXT: Value: 2
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// CHECK-NEXT: TagName: THUMB_ISA_use
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// CHECK-NEXT: Description: Thumb-2
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// CHECK-NEXT: }
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// CHECK-NEXT: Attribute {
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// CHECK-NEXT: Tag: 10
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// CHECK-NEXT: Value: 3
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// CHECK-NEXT: TagName: FP_arch
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// CHECK-NEXT: Description: VFPv3
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// CHECK-NEXT: }
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// CHECK-NEXT: Attribute {
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// CHECK-NEXT: Tag: 12
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// CHECK-NEXT: Value: 1
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// CHECK-NEXT: TagName: Advanced_SIMD_arch
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// CHECK-NEXT: Description: NEONv1
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// CHECK-NEXT: }
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// CHECK-NEXT: Attribute {
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// CHECK-NEXT: Tag: 14
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// CHECK-NEXT: Value: 0
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// CHECK-NEXT: TagName: ABI_PCS_R9_use
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// CHECK-NEXT: Description: v6
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// CHECK-NEXT: }
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// CHECK-NEXT: Attribute {
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// CHECK-NEXT: Tag: 15
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// CHECK-NEXT: Value: 1
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// CHECK-NEXT: TagName: ABI_PCS_RW_data
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// CHECK-NEXT: Description: PC-relative
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// CHECK-NEXT: }
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// CHECK-NEXT: Attribute {
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// CHECK-NEXT: Tag: 16
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// CHECK-NEXT: Value: 1
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// CHECK-NEXT: TagName: ABI_PCS_RO_data
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// CHECK-NEXT: Description: PC-relative
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// CHECK-NEXT: }
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// CHECK-NEXT: Attribute {
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// CHECK-NEXT: Tag: 17
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// CHECK-NEXT: Value: 2
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// CHECK-NEXT: TagName: ABI_PCS_GOT_use
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// CHECK-NEXT: Description: GOT-Indirect
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// CHECK-NEXT: }
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// CHECK-NEXT: Attribute {
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// CHECK-NEXT: Tag: 18
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// CHECK-NEXT: Value: 4
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// CHECK-NEXT: TagName: ABI_PCS_wchar_t
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// CHECK-NEXT: Description: 4-byte
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// CHECK-NEXT: }
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// CHECK-NEXT: Attribute {
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// CHECK-NEXT: Tag: 20
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// CHECK-NEXT: Value: 1
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// CHECK-NEXT: TagName: ABI_FP_denormal
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// CHECK-NEXT: Description: IEEE-754
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// CHECK-NEXT: }
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// CHECK-NEXT: Attribute {
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// CHECK-NEXT: Tag: 21
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// CHECK-NEXT: Value: 1
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// CHECK-NEXT: TagName: ABI_FP_exceptions
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// CHECK-NEXT: Description: IEEE-754
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// CHECK-NEXT: }
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// CHECK-NEXT: Attribute {
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// CHECK-NEXT: Tag: 23
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// CHECK-NEXT: Value: 3
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// CHECK-NEXT: TagName: ABI_FP_number_model
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// CHECK-NEXT: Description: IEEE-754
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// CHECK-NEXT: }
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// CHECK-NEXT: Attribute {
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// CHECK-NEXT: Tag: 24
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// CHECK-NEXT: Value: 1
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// CHECK-NEXT: TagName: ABI_align_needed
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// CHECK-NEXT: Description: 8-byte alignment
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// CHECK-NEXT: }
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// CHECK-NEXT: Attribute {
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// CHECK-NEXT: Tag: 25
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// CHECK-NEXT: Value: 1
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// CHECK-NEXT: TagName: ABI_align_preserved
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// CHECK-NEXT: Description: 8-byte data alignment
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// CHECK-NEXT: }
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// CHECK-NEXT: Attribute {
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// CHECK-NEXT: Tag: 26
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// CHECK-NEXT: Value: 2
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// CHECK-NEXT: TagName: ABI_enum_size
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// CHECK-NEXT: Description: Int32
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// CHECK-NEXT: }
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// CHECK-NEXT: Attribute {
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// CHECK-NEXT: Tag: 34
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// CHECK-NEXT: Value: 1
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// CHECK-NEXT: TagName: CPU_unaligned_access
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// CHECK-NEXT: Description: v6-style
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// CHECK-NEXT: }
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// CHECK-NEXT: Attribute {
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// CHECK-NEXT: Tag: 38
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// CHECK-NEXT: Value: 1
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// CHECK-NEXT: TagName: ABI_FP_16bit_format
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// CHECK-NEXT: Description: IEEE-754
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// CHECK-NEXT: }
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// CHECK-NEXT: Attribute {
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// CHECK-NEXT: Tag: 68
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// CHECK-NEXT: Value: 1
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// CHECK-NEXT: TagName: Virtualization_use
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// CHECK-NEXT: Description: TrustZone
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// CHECK-NEXT: }
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