7cea026a63
Nothing wrong with reinterpret_cast<llvm::support::ulittle32_t *>(loc),
but that's redundant and not great from readability point of view.
The new functions are wrappers for that kind of reinterpet_casts.
Surprisingly or unsurprisingly, there was no use of big endian read
and write. {read,write}{16,32,64}be have no user. But I think they
still worth to be there in the header for completeness.
http://reviews.llvm.org/D7927
llvm-svn: 230725
57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
//===- lib/ReaderWriter/ELF/X86/X86RelocationHandler.cpp ------------------===//
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//
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// The LLVM Linker
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "X86LinkingContext.h"
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#include "X86TargetHandler.h"
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#include "lld/Core/Endian.h"
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using namespace lld;
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using namespace elf;
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namespace {
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/// \brief R_386_32 - word32: S + A
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static int reloc32(uint8_t *location, uint64_t P, uint64_t S, uint64_t A) {
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int32_t result = (uint32_t)(S + A);
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write32le(location, result | read32le(location));
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return 0;
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}
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/// \brief R_386_PC32 - word32: S + A - P
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static int relocPC32(uint8_t *location, uint64_t P, uint64_t S, uint64_t A) {
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uint32_t result = (uint32_t)((S + A) - P);
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write32le(location, result + read32le(location));
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return 0;
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}
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}
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std::error_code X86TargetRelocationHandler::applyRelocation(
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ELFWriter &writer, llvm::FileOutputBuffer &buf, const lld::AtomLayout &atom,
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const Reference &ref) const {
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uint8_t *atomContent = buf.getBufferStart() + atom._fileOffset;
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uint8_t *location = atomContent + ref.offsetInAtom();
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uint64_t targetVAddress = writer.addressOfAtom(ref.target());
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uint64_t relocVAddress = atom._virtualAddr + ref.offsetInAtom();
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if (ref.kindNamespace() != Reference::KindNamespace::ELF)
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return std::error_code();
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assert(ref.kindArch() == Reference::KindArch::x86);
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switch (ref.kindValue()) {
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case R_386_32:
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reloc32(location, relocVAddress, targetVAddress, ref.addend());
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break;
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case R_386_PC32:
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relocPC32(location, relocVAddress, targetVAddress, ref.addend());
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break;
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default:
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return make_unhandled_reloc_error();
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}
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return std::error_code();
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}
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