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//===- lib/ReaderWriter/ELF/X86/X86TargetHandler.cpp ----------------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "X86TargetHandler.h"
#include "X86LinkingContext.h"
using namespace lld;
using namespace elf;
using namespace llvm::ELF;
/// \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::unique_ptr<Writer> X86TargetHandler::getWriter() {
switch (_x86LinkingContext.getOutputELFType()) {
case llvm::ELF::ET_EXEC:
return std::unique_ptr<Writer>(new elf::ExecutableWriter<X86ELFType>(
_x86LinkingContext, *_x86TargetLayout.get()));
case llvm::ELF::ET_DYN:
return std::unique_ptr<Writer>(new elf::DynamicLibraryWriter<X86ELFType>(
_x86LinkingContext, *_x86TargetLayout.get()));
case llvm::ELF::ET_REL:
llvm_unreachable("TODO: support -r mode");
default:
llvm_unreachable("unsupported output type");
}
}
const Registry::KindStrings X86TargetHandler::kindStrings[] = {
LLD_KIND_STRING_ENTRY(R_386_NONE),
LLD_KIND_STRING_ENTRY(R_386_32),
LLD_KIND_STRING_ENTRY(R_386_PC32),
LLD_KIND_STRING_ENTRY(R_386_GOT32),
LLD_KIND_STRING_ENTRY(R_386_PLT32),
LLD_KIND_STRING_ENTRY(R_386_COPY),
LLD_KIND_STRING_ENTRY(R_386_GLOB_DAT),
LLD_KIND_STRING_ENTRY(R_386_JUMP_SLOT),
LLD_KIND_STRING_ENTRY(R_386_RELATIVE),
LLD_KIND_STRING_ENTRY(R_386_GOTOFF),
LLD_KIND_STRING_ENTRY(R_386_GOTPC),
LLD_KIND_STRING_ENTRY(R_386_32PLT),
LLD_KIND_STRING_ENTRY(R_386_TLS_TPOFF),
LLD_KIND_STRING_ENTRY(R_386_TLS_IE),
LLD_KIND_STRING_ENTRY(R_386_TLS_GOTIE),
LLD_KIND_STRING_ENTRY(R_386_TLS_LE),
LLD_KIND_STRING_ENTRY(R_386_TLS_GD),
LLD_KIND_STRING_ENTRY(R_386_TLS_LDM),
LLD_KIND_STRING_ENTRY(R_386_16),
LLD_KIND_STRING_ENTRY(R_386_PC16),
LLD_KIND_STRING_ENTRY(R_386_8),
LLD_KIND_STRING_ENTRY(R_386_PC8),
LLD_KIND_STRING_ENTRY(R_386_TLS_GD_32),
LLD_KIND_STRING_ENTRY(R_386_TLS_GD_PUSH),
LLD_KIND_STRING_ENTRY(R_386_TLS_GD_CALL),
LLD_KIND_STRING_ENTRY(R_386_TLS_GD_POP),
LLD_KIND_STRING_ENTRY(R_386_TLS_LDM_32),
LLD_KIND_STRING_ENTRY(R_386_TLS_LDM_PUSH),
LLD_KIND_STRING_ENTRY(R_386_TLS_LDM_CALL),
LLD_KIND_STRING_ENTRY(R_386_TLS_LDM_POP),
LLD_KIND_STRING_ENTRY(R_386_TLS_LDO_32),
LLD_KIND_STRING_ENTRY(R_386_TLS_IE_32),
LLD_KIND_STRING_ENTRY(R_386_TLS_LE_32),
LLD_KIND_STRING_ENTRY(R_386_TLS_DTPMOD32),
LLD_KIND_STRING_ENTRY(R_386_TLS_DTPOFF32),
LLD_KIND_STRING_ENTRY(R_386_TLS_TPOFF32),
LLD_KIND_STRING_ENTRY(R_386_TLS_GOTDESC),
LLD_KIND_STRING_ENTRY(R_386_TLS_DESC_CALL),
LLD_KIND_STRING_ENTRY(R_386_TLS_DESC),
LLD_KIND_STRING_ENTRY(R_386_IRELATIVE),
LLD_KIND_STRING_ENTRY(R_386_NUM),
LLD_KIND_STRING_END
};
void X86TargetHandler::registerRelocationNames(Registry ®istry) {
registry.addKindTable(Reference::KindNamespace::ELF, Reference::KindArch::x86,
kindStrings);
}
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();
}
X86TargetHandler::X86TargetHandler(X86LinkingContext &context)
: DefaultTargetHandler(context), _x86LinkingContext(context),
_x86TargetLayout(new X86TargetLayout<X86ELFType>(context)),
_x86RelocationHandler(
new X86TargetRelocationHandler(context, *_x86TargetLayout.get())) {}
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