ac23808619
This would permit the ELF reader to check the architecture that is being selected by the linking process. This patch also sorts the include files according to LLVM conventions. llvm-svn: 220129
65 lines
2.1 KiB
C++
65 lines
2.1 KiB
C++
//===- lib/ReaderWriter/ELF/X86/X86RelocationHandler.cpp ------------------===//
|
|
//
|
|
// The LLVM Linker
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "X86LinkingContext.h"
|
|
#include "X86TargetHandler.h"
|
|
|
|
using namespace lld;
|
|
using namespace elf;
|
|
|
|
namespace {
|
|
/// \brief R_386_32 - word32: S + A
|
|
static int reloc32(uint8_t *location, uint64_t P, uint64_t S, uint64_t A) {
|
|
int32_t result = (uint32_t)(S + A);
|
|
*reinterpret_cast<llvm::support::ulittle32_t *>(location) =
|
|
result |
|
|
(uint32_t) * reinterpret_cast<llvm::support::ulittle32_t *>(location);
|
|
return 0;
|
|
}
|
|
|
|
/// \brief R_386_PC32 - word32: S + A - P
|
|
static int relocPC32(uint8_t *location, uint64_t P, uint64_t S, uint64_t A) {
|
|
uint32_t result = (uint32_t)((S + A) - P);
|
|
*reinterpret_cast<llvm::support::ulittle32_t *>(location) =
|
|
result +
|
|
(uint32_t) * reinterpret_cast<llvm::support::ulittle32_t *>(location);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
std::error_code X86TargetRelocationHandler::applyRelocation(
|
|
ELFWriter &writer, llvm::FileOutputBuffer &buf, const lld::AtomLayout &atom,
|
|
const Reference &ref) const {
|
|
uint8_t *atomContent = buf.getBufferStart() + atom._fileOffset;
|
|
uint8_t *location = atomContent + ref.offsetInAtom();
|
|
uint64_t targetVAddress = writer.addressOfAtom(ref.target());
|
|
uint64_t relocVAddress = atom._virtualAddr + ref.offsetInAtom();
|
|
|
|
if (ref.kindNamespace() != Reference::KindNamespace::ELF)
|
|
return std::error_code();
|
|
assert(ref.kindArch() == Reference::KindArch::x86);
|
|
switch (ref.kindValue()) {
|
|
case R_386_32:
|
|
reloc32(location, relocVAddress, targetVAddress, ref.addend());
|
|
break;
|
|
case R_386_PC32:
|
|
relocPC32(location, relocVAddress, targetVAddress, ref.addend());
|
|
break;
|
|
default: {
|
|
std::string str;
|
|
llvm::raw_string_ostream s(str);
|
|
s << "Unhandled I386 relocation # " << ref.kindValue();
|
|
s.flush();
|
|
llvm_unreachable(str.c_str());
|
|
}
|
|
}
|
|
|
|
return std::error_code();
|
|
}
|