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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::mips ||
triple.getArch() == llvm::Triple::mipsel ||
triple.getArch() == llvm::Triple::mips64 ||
triple.getArch() == llvm::Triple::mips64el)
return llvm::make_unique<MipsLinkingContext>(triple);
return nullptr;
}
static std::unique_ptr<TargetHandler> createTarget(llvm::Triple triple,
MipsLinkingContext &ctx) {
switch (triple.getArch()) {
case llvm::Triple::mips:
return llvm::make_unique<MipsTargetHandler<ELF32BE>>(ctx);
case llvm::Triple::mipsel:
return llvm::make_unique<MipsTargetHandler<ELF32LE>>(ctx);
case llvm::Triple::mips64:
return llvm::make_unique<MipsTargetHandler<ELF64BE>>(ctx);
case llvm::Triple::mips64el:
return llvm::make_unique<MipsTargetHandler<ELF64LE>>(ctx);
default:
llvm_unreachable("Unhandled arch");
}
}
MipsLinkingContext::MipsLinkingContext(llvm::Triple triple)
: ELFLinkingContext(triple, createTarget(triple, *this)) {}
uint64_t MipsLinkingContext::getBaseAddress() const {
if (_baseAddress != 0 || getOutputELFType() != llvm::ELF::ET_EXEC)
return _baseAddress;
switch (getAbi()) {
case MipsAbi::O32:
return 0x0400000;
case MipsAbi::N32:
return 0x10000000;
case MipsAbi::N64:
return 0x120000000;
}
llvm_unreachable("unknown MIPS ABI flag");
}
StringRef MipsLinkingContext::entrySymbolName() const {
if (_outputELFType == elf::ET_EXEC && _entrySymbolName.empty())
return "__start";
return _entrySymbolName;
}
StringRef MipsLinkingContext::getDefaultInterpreter() const {
switch (getAbi()) {
case MipsAbi::O32:
return "/lib/ld.so.1";
case MipsAbi::N32:
return "/lib32/ld.so.1";
case MipsAbi::N64:
return "/lib64/ld.so.1";
}
llvm_unreachable("unknown MIPS ABI flag");
}
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:
return true;
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 isDynamic();
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;
}
}
MipsAbi MipsLinkingContext::getAbi() const {
auto &handler = static_cast<MipsBaseTargetHandler &>(getTargetHandler());
return handler.getAbi();
}
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_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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