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[yaml2obj] - Add a way to set sh_entsize for relocation sections.

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We are missing ability to override the sh_entsize field for
SHT_REL[A] sections. It would be useful for writing test cases.

Differential revision: https://reviews.llvm.org/D73621
This commit is contained in:
Georgii Rymar 2020-01-29 16:40:40 +03:00
parent ca9e0184f9
commit dd34fffe7c
2 changed files with 79 additions and 2 deletions
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8
lib/ObjectYAML/ELFEmitter.cpp
View File

@ -796,8 +796,12 @@ void ELFState<ELFT>::writeSectionContent(
"Section type is not SHT_REL nor SHT_RELA");
bool IsRela = Section.Type == llvm::ELF::SHT_RELA;
SHeader.sh_entsize = IsRela ? sizeof(Elf_Rela) : sizeof(Elf_Rel);
SHeader.sh_size = SHeader.sh_entsize * Section.Relocations.size();
if (Section.EntSize)
SHeader.sh_entsize = *Section.EntSize;
else
SHeader.sh_entsize = IsRela ? sizeof(Elf_Rela) : sizeof(Elf_Rel);
SHeader.sh_size = (IsRela ? sizeof(Elf_Rela) : sizeof(Elf_Rel)) *
Section.Relocations.size();
// For relocation section set link to .symtab by default.
unsigned Link = 0;

73
test/tools/yaml2obj/ELF/reloc-sec-entry-size.yaml Normal file
View File

@ -0,0 +1,73 @@
## Test how yaml2obj sets values for sh_entsize fields of relocation sections.
# RUN: yaml2obj --docnum=1 %s -o %t64
# RUN: llvm-readelf --sections %t64 | FileCheck %s --check-prefix=ELF64
# RUN: yaml2obj --docnum=2 %s -o %t32
# RUN: llvm-readelf --sections %t32 | FileCheck %s --check-prefix=ELF32
# ELF64: Name Type Address Off Size ES
# ELF64: .rela.default RELA 0000000000000000 000040 000000 18
# ELF64: .rel.default REL 0000000000000000 000040 000000 10
# ELF64: .relr.default RELR 0000000000000000 000040 000000 08
# ELF64: .rela.custom RELA 0000000000000000 000040 000000 ff
# ELF64: .rel.custom REL 0000000000000000 000040 000000 ff
# ELF64: .relr.custom RELR 0000000000000000 000040 000000 ff
# ELF32: Name Type Address Off Size ES
# ELF32: .rela.default RELA 00000000 000034 000000 0c
# ELF32: .rel.default REL 00000000 000034 000000 08
# ELF32: .relr.default RELR 00000000 000034 000000 04
# ELF32: .rela.custom RELA 00000000 000034 000000 ff
# ELF32: .rel.custom REL 00000000 000034 000000 ff
# ELF32: .relr.custom RELR 00000000 000034 000000 ff
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_REL
Machine: EM_X86_64
Sections:
## Check default sh_entsize field values.
- Name: .rela.default
Type: SHT_RELA
- Name: .rel.default
Type: SHT_REL
- Name: .relr.default
Type: SHT_RELR
## Check we can set sh_entsize fields to arbitrary values.
- Name: .rela.custom
Type: SHT_RELA
EntSize: 0xFF
- Name: .rel.custom
Type: SHT_REL
EntSize: 0xFF
- Name: .relr.custom
Type: SHT_RELR
EntSize: 0xFF
--- !ELF
FileHeader:
Class: ELFCLASS32
Data: ELFDATA2LSB
Type: ET_REL
Machine: EM_386
Sections:
## Check default sh_entsizes field values.
- Name: .rela.default
Type: SHT_RELA
- Name: .rel.default
Type: SHT_REL
- Name: .relr.default
Type: SHT_RELR
## Check we can set sh_entsize fields to arbitrary values.
- Name: .rela.custom
Type: SHT_RELA
EntSize: 0xFF
- Name: .rel.custom
Type: SHT_REL
EntSize: 0xFF
- Name: .relr.custom
Type: SHT_RELR
EntSize: 0xFF