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//===- lib/ReaderWriter/ELF/Mips/MipsLinkingContext.cpp -------------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "Atoms.h"
#include "MipsCtorsOrderPass.h"
#include "MipsLinkingContext.h"
#include "MipsRelocationPass.h"
#include "MipsTargetHandler.h"
using namespace lld;
using namespace lld::elf;
std::unique_ptr<ELFLinkingContext>
elf::createMipsLinkingContext(llvm::Triple triple) {
if (triple.getArch() == llvm::Triple::mipsel ||
triple.getArch() == llvm::Triple::mips64el)
return llvm::make_unique<MipsLinkingContext>(triple);
return nullptr;
}
typedef std::unique_ptr<TargetHandler> TargetHandlerPtr;
static TargetHandlerPtr createTarget(llvm::Triple triple,
MipsLinkingContext &ctx) {
switch (triple.getArch()) {
case llvm::Triple::mipsel:
return TargetHandlerPtr(new MipsTargetHandler<Mips32ELType>(ctx));
case llvm::Triple::mips64el:
return TargetHandlerPtr(new MipsTargetHandler<Mips64ELType>(ctx));
default:
llvm_unreachable("Unhandled arch");
}
}
MipsLinkingContext::MipsLinkingContext(llvm::Triple triple)
: ELFLinkingContext(triple, createTarget(triple, *this)),
_flagsMerger(triple.isArch64Bit()) {}
std::error_code MipsLinkingContext::mergeHeaderFlags(uint8_t fileClass,
uint64_t flags) {
return _flagsMerger.mergeHeaderFlags(fileClass, flags);
}
void MipsLinkingContext::mergeReginfoMask(const MipsReginfo &info) {
if (_reginfoMask.hasValue())
_reginfoMask->merge(info);
else
_reginfoMask = info;
}
uint32_t MipsLinkingContext::getMergedELFFlags() const {
return _flagsMerger.getMergedELFFlags();
}
const llvm::Optional<MipsReginfo> &
MipsLinkingContext::getMergeReginfoMask() const {
return _reginfoMask;
}
uint64_t MipsLinkingContext::getBaseAddress() const {
if (_baseAddress == 0 && getOutputELFType() == llvm::ELF::ET_EXEC)
return getTriple().isArch64Bit() ? 0x120000000 : 0x400000;
return _baseAddress;
}
StringRef MipsLinkingContext::entrySymbolName() const {
if (_outputELFType == elf::ET_EXEC && _entrySymbolName.empty())
return "__start";
return _entrySymbolName;
}
StringRef MipsLinkingContext::getDefaultInterpreter() const {
return getTriple().isArch64Bit() ? "/lib64/ld.so.1" : "/lib/ld.so.1";
}
void MipsLinkingContext::addPasses(PassManager &pm) {
auto pass = createMipsRelocationPass(*this);
if (pass)
pm.add(std::move(pass));
ELFLinkingContext::addPasses(pm);
pm.add(llvm::make_unique<elf::MipsCtorsOrderPass>());
}
bool MipsLinkingContext::isDynamicRelocation(const Reference &r) const {
if (r.kindNamespace() != Reference::KindNamespace::ELF)
return false;
assert(r.kindArch() == Reference::KindArch::Mips);
switch (r.kindValue()) {
case llvm::ELF::R_MIPS_COPY:
case llvm::ELF::R_MIPS_REL32:
case llvm::ELF::R_MIPS_TLS_DTPMOD32:
case llvm::ELF::R_MIPS_TLS_DTPREL32:
case llvm::ELF::R_MIPS_TLS_TPREL32:
case llvm::ELF::R_MIPS_TLS_DTPMOD64:
case llvm::ELF::R_MIPS_TLS_DTPREL64:
case llvm::ELF::R_MIPS_TLS_TPREL64:
return true;
default:
return false;
}
}
bool MipsLinkingContext::isCopyRelocation(const Reference &r) const {
if (r.kindNamespace() != Reference::KindNamespace::ELF)
return false;
assert(r.kindArch() == Reference::KindArch::Mips);
if (r.kindValue() == llvm::ELF::R_MIPS_COPY)
return true;
return false;
}
bool MipsLinkingContext::isPLTRelocation(const Reference &r) const {
if (r.kindNamespace() != Reference::KindNamespace::ELF)
return false;
assert(r.kindArch() == Reference::KindArch::Mips);
switch (r.kindValue()) {
case llvm::ELF::R_MIPS_JUMP_SLOT:
return true;
default:
return false;
}
}
bool MipsLinkingContext::isRelativeReloc(const Reference &r) const {
if (r.kindNamespace() != Reference::KindNamespace::ELF)
return false;
assert(r.kindArch() == Reference::KindArch::Mips);
switch (r.kindValue()) {
case llvm::ELF::R_MIPS_REL32:
case llvm::ELF::R_MIPS_GPREL16:
case llvm::ELF::R_MIPS_GPREL32:
return true;
default:
return false;
}
}
const Registry::KindStrings kindStrings[] = {
#define ELF_RELOC(name, value) LLD_KIND_STRING_ENTRY(name),
#include "llvm/Support/ELFRelocs/Mips.def"
#undef ELF_RELOC
LLD_KIND_STRING_ENTRY(LLD_R_MIPS_GLOBAL_GOT),
LLD_KIND_STRING_ENTRY(LLD_R_MIPS_32_HI16),
LLD_KIND_STRING_ENTRY(LLD_R_MIPS_64_HI16),
LLD_KIND_STRING_ENTRY(LLD_R_MIPS_GLOBAL_26),
LLD_KIND_STRING_ENTRY(LLD_R_MIPS_HI16),
LLD_KIND_STRING_ENTRY(LLD_R_MIPS_LO16),
LLD_KIND_STRING_ENTRY(LLD_R_MIPS_STO_PLT),
LLD_KIND_STRING_ENTRY(LLD_R_MICROMIPS_GLOBAL_26_S1),
LLD_KIND_STRING_END
};
void MipsLinkingContext::registerRelocationNames(Registry ®istry) {
registry.addKindTable(Reference::KindNamespace::ELF,
Reference::KindArch::Mips, kindStrings);
}
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