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Link .ARM.exidx with corresponding text section.

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The sh_link in the ELF section header of .ARM.exidx should
be filled with the section index of the corresponding text
section.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174372 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Logan Chien 2013-02-05 14:18:59 +00:00
parent e2d5590c33
commit b0c899666a
2 changed files with 65 additions and 0 deletions
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18
lib/MC/ELFObjectWriter.cpp
View File

@ -1332,6 +1332,24 @@ void ELFObjectWriter::WriteSection(MCAssembler &Asm,
break;
}
if (TargetObjectWriter->getEMachine() == ELF::EM_ARM &&
Section.getType() == ELF::SHT_ARM_EXIDX) {
StringRef SecName(Section.getSectionName());
if (SecName == ".ARM.exidx") {
sh_link = SectionIndexMap.lookup(
Asm.getContext().getELFSection(".text",
ELF::SHT_PROGBITS,
ELF::SHF_EXECINSTR | ELF::SHF_ALLOC,
SectionKind::getText()));
} else if (SecName.startswith(".ARM.exidx")) {
sh_link = SectionIndexMap.lookup(
Asm.getContext().getELFSection(SecName.substr(sizeof(".ARM.exidx") - 1),
ELF::SHT_PROGBITS,
ELF::SHF_EXECINSTR | ELF::SHF_ALLOC,
SectionKind::getText()));
}
}
WriteSecHdrEntry(SectionStringTableIndex[&Section], Section.getType(),
Section.getFlags(), 0, Offset, Size, sh_link, sh_info,
Alignment, Section.getEntrySize());

47
test/CodeGen/ARM/ehabi-mc-sh_link.ll Normal file
View File

@ -0,0 +1,47 @@
; Test the sh_link in Elf32_Shdr.
; The .ARM.exidx section should be linked with corresponding text section.
; The sh_link in Elf32_Shdr should be filled with the section index of
; the text section.
; RUN: llc -mtriple arm-unknown-linux-gnueabi \
; RUN: -arm-enable-ehabi -arm-enable-ehabi-descriptors \
; RUN: -filetype=obj -o - %s \
; RUN: | elf-dump --dump-section-data \
; RUN: | FileCheck %s
define void @test1() nounwind {
entry:
ret void
}
define void @test2() nounwind section ".test_section" {
entry:
ret void
}
; CHECK: # Section 1
; CHECK-NEXT: (('sh_name', 0x00000010) # '.text'
; CHECK: (('sh_name', 0x00000005) # '.ARM.exidx'
; CHECK-NEXT: ('sh_type', 0x70000001)
; CHECK-NEXT: ('sh_flags', 0x00000082)
; CHECK-NEXT: ('sh_addr', 0x00000000)
; CHECK-NEXT: ('sh_offset', 0x0000005c)
; CHECK-NEXT: ('sh_size', 0x00000008)
; CHECK-NEXT: ('sh_link', 0x00000001)
; CHECK-NEXT: ('sh_info', 0x00000000)
; CHECK-NEXT: ('sh_addralign', 0x00000004)
; CHECK: # Section 7
; CHECK-NEXT: (('sh_name', 0x00000039) # '.test_section'
; CHECK: (('sh_name', 0x0000002f) # '.ARM.exidx.test_section'
; CHECK-NEXT: ('sh_type', 0x70000001)
; CHECK-NEXT: ('sh_flags', 0x00000082)
; CHECK-NEXT: ('sh_addr', 0x00000000)
; CHECK-NEXT: ('sh_offset', 0x00000068)
; CHECK-NEXT: ('sh_size', 0x00000008)
; CHECK-NEXT: ('sh_link', 0x00000007)
; CHECK-NEXT: ('sh_info', 0x00000000)
; CHECK-NEXT: ('sh_addralign', 0x00000004)