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[Object][ELF] Add support for dumping dynamic relocations when sections are stripped.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240703 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael J. Spencer
2015-06-25 21:47:32 +00:00
parent ee46b796c2
commit 4cbb2db3ab
6 changed files with 104 additions and 4 deletions
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48
include/llvm/Object/ELF.h
View File

@@ -265,6 +265,7 @@ private:
DynRegionInfo DynHashRegion;
DynRegionInfo DynStrRegion;
DynRegionInfo DynSymRegion;
DynRegionInfo DynRelaRegion;
// Pointer to SONAME entry in dynamic string table
// This is set the first time getLoadName is called.
@@ -363,6 +364,21 @@ public:
return Elf_Sym_Iter(0, nullptr, true);
}
Elf_Rela_Iter begin_dyn_rela() const {
if (DynRelaRegion.Addr)
return Elf_Rela_Iter(DynRelaRegion.EntSize,
(const char *)DynRelaRegion.Addr);
return Elf_Rela_Iter(0, nullptr);
}
Elf_Rela_Iter end_dyn_rela() const {
if (DynRelaRegion.Addr)
return Elf_Rela_Iter(
DynRelaRegion.EntSize,
(const char *)DynRelaRegion.Addr + DynRelaRegion.Size);
return Elf_Rela_Iter(0, nullptr);
}
Elf_Rela_Iter begin_rela(const Elf_Shdr *sec) const {
return Elf_Rela_Iter(sec->sh_entsize,
(const char *)(base() + sec->sh_offset));
@@ -762,6 +778,38 @@ ELFFile<ELFT>::ELFFile(StringRef Object, std::error_code &EC)
}
}
// Scan dynamic table.
for (Elf_Dyn_Iter DynI = begin_dynamic_table(), DynE = end_dynamic_table();
DynI != DynE; ++DynI) {
switch (DynI->d_tag) {
case ELF::DT_RELA: {
uint64_t VBase = 0;
const uint8_t *FBase = nullptr;
for (Elf_Phdr_Iter PhdrI = begin_program_headers(),
PhdrE = end_program_headers();
PhdrI != PhdrE; ++PhdrI) {
if (PhdrI->p_type != ELF::PT_LOAD)
continue;
if (DynI->getPtr() >= PhdrI->p_vaddr &&
DynI->getPtr() < PhdrI->p_vaddr + PhdrI->p_memsz) {
VBase = PhdrI->p_vaddr;
FBase = base() + PhdrI->p_offset;
break;
}
}
if (!VBase)
return;
DynRelaRegion.Addr = FBase + DynI->getPtr() - VBase;
break;
}
case ELF::DT_RELASZ:
DynRelaRegion.Size = DynI->getVal();
break;
case ELF::DT_RELAENT:
DynRelaRegion.EntSize = DynI->getVal();
}
}
EC = std::error_code();
}

2
include/llvm/Object/ELFTypes.h
View File

@@ -293,7 +293,7 @@ struct Elf_Dyn_Impl : Elf_Dyn_Base<ELFT> {
using Elf_Dyn_Base<ELFT>::d_un;
int64_t getTag() const { return d_tag; }
uint64_t getVal() const { return d_un.d_val; }
uint64_t getPtr() const { return d_un.ptr; }
uint64_t getPtr() const { return d_un.d_ptr; }
};
// Elf_Rel: Elf Relocation