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[Mips] Support grouping of multiple consecutive relocations in case of N32 and 64-bit MIPS ABIs

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llvm-svn: 246337
This commit is contained in:
Simon Atanasyan 2015-08-28 21:39:21 +00:00
parent 9638d7d162
commit e235d45026
2 changed files with 83 additions and 1 deletions
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16
lld/lib/ReaderWriter/ELF/Mips/MipsELFFile.cpp
View File

@ -226,12 +226,26 @@ void MipsELFFile<ELFT>::createRelocationReferences(
const Elf_Sym *symbol, ArrayRef<uint8_t> content,
range<const Elf_Rela *> rels) {
const auto value = this->getSymbolValue(symbol);
unsigned numInGroup = 0;
for (const auto &rel : rels) {
if (rel.r_offset < value || value + content.size() <= rel.r_offset)
if (rel.r_offset < value || value + content.size() <= rel.r_offset) {
numInGroup = 0;
continue;
}
if (numInGroup > 0) {
auto &last =
*static_cast<MipsELFReference<ELFT> *>(this->_references.back());
if (last.offsetInAtom() + value == rel.r_offset) {
last.setTag(last.tag() |
(rel.getType(isMips64EL<ELFT>()) << 8 * (numInGroup - 1)));
++numInGroup;
continue;
}
}
auto r = new (this->_readerStorage) MipsELFReference<ELFT>(value, rel);
this->addReferenceToSymbol(r, symbol);
this->_references.push_back(r);
numInGroup = 1;
}
}

68
lld/test/elf/Mips/n32-rela-chain.test Normal file
View File

@ -0,0 +1,68 @@
# Check grouping of multiple consecutive relocations in case of N32
# and 64-bit MIPS ABIs.
# RUN: yaml2obj -format=elf %s > %t.o
# RUN: lld -flavor gnu -target mips -o %t.exe %t.o
# RUN: llvm-objdump -s -t %t.exe | FileCheck %s
# CHECK: Contents of section .text:
# CHECK-NEXT: 10000130 00001001 00002004
# CHECK: 10002000 l .data 00000004 D0
---
FileHeader:
Class: ELFCLASS32
Data: ELFDATA2MSB
Type: ET_REL
Machine: EM_MIPS
Flags: [EF_MIPS_PIC, EF_MIPS_CPIC, EF_MIPS_ARCH_64, EF_MIPS_ABI2]
Sections:
- Name: .text
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
AddressAlign: 16
Size: 8
- Name: .rel.text
Type: SHT_RELA
Link: .symtab
AddressAlign: 4
Info: .text
Relocations:
- Offset: 0
Symbol: D0
Type: R_MIPS_32
Addend: 0x10000
- Offset: 0
Symbol: D0
Type: R_MIPS_HI16
- Offset: 4
Symbol: D0
Type: R_MIPS_32
Addend: 4
- Offset: 4
Symbol: D0
Type: R_MIPS_LO16
- Name: .data
Type: SHT_PROGBITS
Flags: [ SHF_WRITE, SHF_ALLOC ]
AddressAlign: 16
Size: 4
Symbols:
Local:
- Name: D0
Type: STT_FUNC
Section: .data
Value: 0
Size: 4
Global:
- Name: __start
Type: STT_FUNC
Section: .text
Value: 0
Size: 8
...