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//===- lib/ReaderWriter/ELF/Mips/MipsTargetHandler32EL.cpp ----------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "ELFReader.h"
#include "MipsELFFile.h"
#include "MipsELFWriters.h"
#include "MipsTargetHandler.h"
namespace lld {
namespace elf {
template <class ELFT>
MipsTargetHandler<ELFT>::MipsTargetHandler(MipsLinkingContext &ctx)
: _ctx(ctx), _targetLayout(new MipsTargetLayout<ELFT>(ctx, _abiInfoHandler)),
_relocationHandler(
createMipsRelocationHandler<ELFT>(ctx, *_targetLayout)) {}
template <class ELFT>
std::unique_ptr<Reader> MipsTargetHandler<ELFT>::getObjReader() {
return llvm::make_unique<ELFReader<MipsELFFile<ELFT>>>(_ctx);
}
template <class ELFT>
std::unique_ptr<Reader> MipsTargetHandler<ELFT>::getDSOReader() {
return llvm::make_unique<ELFReader<DynamicFile<ELFT>>>(_ctx);
}
template <class ELFT>
const TargetRelocationHandler &
MipsTargetHandler<ELFT>::getRelocationHandler() const {
return *_relocationHandler;
}
template <class ELFT>
std::unique_ptr<Writer> MipsTargetHandler<ELFT>::getWriter() {
switch (_ctx.getOutputELFType()) {
case llvm::ELF::ET_EXEC:
return llvm::make_unique<MipsExecutableWriter<ELFT>>(_ctx, *_targetLayout,
_abiInfoHandler);
case llvm::ELF::ET_DYN:
return llvm::make_unique<MipsDynamicLibraryWriter<ELFT>>(
_ctx, *_targetLayout, _abiInfoHandler);
case llvm::ELF::ET_REL:
llvm_unreachable("TODO: support -r mode");
default:
llvm_unreachable("unsupported output type");
}
}
template class MipsTargetHandler<ELF32BE>;
template class MipsTargetHandler<ELF32LE>;
template class MipsTargetHandler<ELF64BE>;
template class MipsTargetHandler<ELF64LE>;
template <class ELFT>
MipsSymbolTable<ELFT>::MipsSymbolTable(const ELFLinkingContext &ctx)
: SymbolTable<ELFT>(ctx, ".symtab",
TargetLayout<ELFT>::ORDER_SYMBOL_TABLE) {}
template <class ELFT>
void MipsSymbolTable<ELFT>::addDefinedAtom(Elf_Sym &sym, const DefinedAtom *da,
int64_t addr) {
SymbolTable<ELFT>::addDefinedAtom(sym, da, addr);
switch (da->codeModel()) {
case DefinedAtom::codeMipsMicro:
sym.st_other |= llvm::ELF::STO_MIPS_MICROMIPS;
break;
case DefinedAtom::codeMipsMicroPIC:
sym.st_other |= llvm::ELF::STO_MIPS_MICROMIPS | llvm::ELF::STO_MIPS_PIC;
break;
default:
break;
}
}
template <class ELFT> void MipsSymbolTable<ELFT>::finalize(bool sort) {
SymbolTable<ELFT>::finalize(sort);
for (auto &ste : this->_symbolTable) {
if (!ste._atom)
continue;
if (const auto *da = dyn_cast<DefinedAtom>(ste._atom)) {
if (da->codeModel() == DefinedAtom::codeMipsMicro ||
da->codeModel() == DefinedAtom::codeMipsMicroPIC) {
// Adjust dynamic microMIPS symbol value. That allows a dynamic
// linker to recognize and handle this symbol correctly.
ste._symbol.st_value = ste._symbol.st_value | 1;
}
}
}
}
template class MipsSymbolTable<ELF32BE>;
template class MipsSymbolTable<ELF32LE>;
template class MipsSymbolTable<ELF64BE>;
template class MipsSymbolTable<ELF64LE>;
template <class ELFT>
MipsDynamicSymbolTable<ELFT>::MipsDynamicSymbolTable(
const ELFLinkingContext &ctx, MipsTargetLayout<ELFT> &layout)
: DynamicSymbolTable<ELFT>(ctx, layout, ".dynsym",
TargetLayout<ELFT>::ORDER_DYNAMIC_SYMBOLS),
_targetLayout(layout) {}
template <class ELFT> void MipsDynamicSymbolTable<ELFT>::sortSymbols() {
typedef typename DynamicSymbolTable<ELFT>::SymbolEntry SymbolEntry;
std::stable_sort(this->_symbolTable.begin(), this->_symbolTable.end(),
[this](const SymbolEntry &A, const SymbolEntry &B) {
if (A._symbol.getBinding() != STB_GLOBAL &&
B._symbol.getBinding() != STB_GLOBAL)
return A._symbol.getBinding() < B._symbol.getBinding();
return _targetLayout.getGOTSection().compare(A._atom,
B._atom);
});
}
template <class ELFT> void MipsDynamicSymbolTable<ELFT>::finalize() {
DynamicSymbolTable<ELFT>::finalize();
const auto &pltSection = _targetLayout.getPLTSection();
for (auto &ste : this->_symbolTable) {
const Atom *a = ste._atom;
if (!a)
continue;
if (auto *layout = pltSection.findPLTLayout(a)) {
a = layout->_atom;
// Under some conditions a dynamic symbol table record should hold
// a symbol value of the corresponding PLT entry. For details look
// at the PLT entry creation code in the class MipsRelocationPass.
// Let's update atomLayout fields for such symbols.
assert(!ste._atomLayout);
ste._symbol.st_value = layout->_virtualAddr;
ste._symbol.st_other |= ELF::STO_MIPS_PLT;
}
if (const auto *da = dyn_cast<DefinedAtom>(a)) {
if (da->codeModel() == DefinedAtom::codeMipsMicro ||
da->codeModel() == DefinedAtom::codeMipsMicroPIC) {
// Adjust dynamic microMIPS symbol value. That allows a dynamic
// linker to recognize and handle this symbol correctly.
ste._symbol.st_value = ste._symbol.st_value | 1;
}
}
}
}
template class MipsDynamicSymbolTable<ELF32BE>;
template class MipsDynamicSymbolTable<ELF32LE>;
template class MipsDynamicSymbolTable<ELF64BE>;
template class MipsDynamicSymbolTable<ELF64LE>;
}
}
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