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//===- lib/ReaderWriter/ELF/PPC/PPCTargetHandler.cpp ----------------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "PPCTargetHandler.h"
#include "PPCLinkingContext.h"
using namespace lld;
using namespace elf;
using namespace llvm::ELF;
/// \brief The following relocation routines are derived from the
/// SYSTEM V APPLICATION BINARY INTERFACE: PowerPC Processor Supplement
/// Symbols used:
/// A: Added used to compute the value, r_addend
/// P: Place address of the field being relocated, r_offset
/// S: Value of the symbol whose index resides in the relocation entry.
/// \brief low24 (S + A - P) >> 2 : Verify
static int relocB24PCREL(uint8_t *location, uint64_t P, uint64_t S,
uint64_t A) {
int32_t result = (uint32_t)(((S + A) - P));
if ((result < 0x1000000) && (result > -0x1000000)) {
result &= ~-(0x1000000);
*reinterpret_cast<llvm::support::ubig32_t *>(location) = result |
(uint32_t)*reinterpret_cast<llvm::support::ubig32_t *>(location);
return 0;
}
return 1;
}
std::error_code PPCTargetRelocationHandler::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::PowerPC);
switch (ref.kindValue()) {
case R_PPC_REL24:
relocB24PCREL(location, relocVAddress, targetVAddress, ref.addend());
break;
default : {
std::string str;
llvm::raw_string_ostream s(str);
s << "Unhandled PowerPC relocation: #" << ref.kindValue();
s.flush();
llvm_unreachable(str.c_str());
}
}
return std::error_code();
}
PPCTargetHandler::PPCTargetHandler(PPCLinkingContext &context)
: DefaultTargetHandler(context), _ppcLinkingContext(context),
_ppcTargetLayout(new PPCTargetLayout<PPCELFType>(context)),
_ppcRelocationHandler(
new PPCTargetRelocationHandler(context, *_ppcTargetLayout.get())) {}
void PPCTargetHandler::registerRelocationNames(Registry ®istry) {
registry.addKindTable(Reference::KindNamespace::ELF,
Reference::KindArch::PowerPC, kindStrings);
}
std::unique_ptr<Writer> PPCTargetHandler::getWriter() {
switch (_ppcLinkingContext.getOutputELFType()) {
case llvm::ELF::ET_EXEC:
return std::unique_ptr<Writer>(new elf::ExecutableWriter<PPCELFType>(
_ppcLinkingContext, *_ppcTargetLayout.get()));
case llvm::ELF::ET_DYN:
return std::unique_ptr<Writer>(new elf::DynamicLibraryWriter<PPCELFType>(
_ppcLinkingContext, *_ppcTargetLayout.get()));
case llvm::ELF::ET_REL:
llvm_unreachable("TODO: support -r mode");
default:
llvm_unreachable("unsupported output type");
}
}
const Registry::KindStrings PPCTargetHandler::kindStrings[] = {
LLD_KIND_STRING_ENTRY(R_PPC_NONE),
LLD_KIND_STRING_ENTRY(R_PPC_ADDR32),
LLD_KIND_STRING_ENTRY(R_PPC_ADDR24),
LLD_KIND_STRING_ENTRY(R_PPC_ADDR16),
LLD_KIND_STRING_ENTRY(R_PPC_ADDR16_LO),
LLD_KIND_STRING_ENTRY(R_PPC_ADDR16_HI),
LLD_KIND_STRING_ENTRY(R_PPC_ADDR16_HA),
LLD_KIND_STRING_ENTRY(R_PPC_ADDR14),
LLD_KIND_STRING_ENTRY(R_PPC_ADDR14_BRTAKEN),
LLD_KIND_STRING_ENTRY(R_PPC_ADDR14_BRNTAKEN),
LLD_KIND_STRING_ENTRY(R_PPC_REL24),
LLD_KIND_STRING_ENTRY(R_PPC_REL14),
LLD_KIND_STRING_ENTRY(R_PPC_REL14_BRTAKEN),
LLD_KIND_STRING_ENTRY(R_PPC_REL14_BRNTAKEN),
LLD_KIND_STRING_ENTRY(R_PPC_GOT16),
LLD_KIND_STRING_ENTRY(R_PPC_GOT16_LO),
LLD_KIND_STRING_ENTRY(R_PPC_GOT16_HI),
LLD_KIND_STRING_ENTRY(R_PPC_GOT16_HA),
LLD_KIND_STRING_ENTRY(R_PPC_REL32),
LLD_KIND_STRING_ENTRY(R_PPC_TLS),
LLD_KIND_STRING_ENTRY(R_PPC_DTPMOD32),
LLD_KIND_STRING_ENTRY(R_PPC_TPREL16),
LLD_KIND_STRING_ENTRY(R_PPC_TPREL16_LO),
LLD_KIND_STRING_ENTRY(R_PPC_TPREL16_HI),
LLD_KIND_STRING_ENTRY(R_PPC_TPREL16_HA),
LLD_KIND_STRING_ENTRY(R_PPC_TPREL32),
LLD_KIND_STRING_ENTRY(R_PPC_DTPREL16),
LLD_KIND_STRING_ENTRY(R_PPC_DTPREL16_LO),
LLD_KIND_STRING_ENTRY(R_PPC_DTPREL16_HI),
LLD_KIND_STRING_ENTRY(R_PPC_DTPREL16_HA),
LLD_KIND_STRING_ENTRY(R_PPC_DTPREL32),
LLD_KIND_STRING_ENTRY(R_PPC_GOT_TLSGD16),
LLD_KIND_STRING_ENTRY(R_PPC_GOT_TLSGD16_LO),
LLD_KIND_STRING_ENTRY(R_PPC_GOT_TLSGD16_HI),
LLD_KIND_STRING_ENTRY(R_PPC_GOT_TLSGD16_HA),
LLD_KIND_STRING_ENTRY(R_PPC_GOT_TLSLD16),
LLD_KIND_STRING_ENTRY(R_PPC_GOT_TLSLD16_LO),
LLD_KIND_STRING_ENTRY(R_PPC_GOT_TLSLD16_HI),
LLD_KIND_STRING_ENTRY(R_PPC_GOT_TLSLD16_HA),
LLD_KIND_STRING_ENTRY(R_PPC_GOT_TPREL16),
LLD_KIND_STRING_ENTRY(R_PPC_GOT_TPREL16_LO),
LLD_KIND_STRING_ENTRY(R_PPC_GOT_TPREL16_HI),
LLD_KIND_STRING_ENTRY(R_PPC_GOT_TPREL16_HA),
LLD_KIND_STRING_ENTRY(R_PPC_GOT_DTPREL16),
LLD_KIND_STRING_ENTRY(R_PPC_GOT_DTPREL16_LO),
LLD_KIND_STRING_ENTRY(R_PPC_GOT_DTPREL16_HI),
LLD_KIND_STRING_ENTRY(R_PPC_GOT_DTPREL16_HA),
LLD_KIND_STRING_ENTRY(R_PPC_TLSGD),
LLD_KIND_STRING_ENTRY(R_PPC_TLSLD),
LLD_KIND_STRING_ENTRY(R_PPC_REL16),
LLD_KIND_STRING_ENTRY(R_PPC_REL16_LO),
LLD_KIND_STRING_ENTRY(R_PPC_REL16_HI),
LLD_KIND_STRING_ENTRY(R_PPC_REL16_HA),
LLD_KIND_STRING_END
};
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