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//===- lib/ReaderWriter/ELF/Hexagon/HexagonTargetHandler.cpp --------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "HexagonTargetHandler.h"
#include "HexagonTargetInfo.h"
#include "lld/ReaderWriter/RelocationHelperFunctions.h"
using namespace lld;
using namespace elf;
using namespace llvm::ELF;
namespace {
/// \brief Word32_B22: 0x01ff3ffe : (S + A - P) >> 2 : Verify
int relocB22PCREL(uint8_t *location, uint64_t P, uint64_t S, uint64_t A) {
int32_t result = (uint32_t)(((S + A) - P)>>2);
if ((result < 0x200000) && (result > -0x200000)) {
result = lld::scatterBits<int32_t>(result, 0x01ff3ffe);
*reinterpret_cast<llvm::support::ulittle32_t *>(location) = result |
(uint32_t)*reinterpret_cast<llvm::support::ulittle32_t *>(location);
return 0;
}
return 1;
}
/// \brief Word32_B15: 0x00df20fe : (S + A - P) >> 2 : Verify
int relocB15PCREL(uint8_t *location, uint64_t P, uint64_t S, uint64_t A) {
int32_t result = (uint32_t)(((S + A) - P)>>2);
if ((result < 0x8000) && (result > -0x8000)) {
result = lld::scatterBits<int32_t>(result, 0x00df20fe);
*reinterpret_cast<llvm::support::ulittle32_t *>(location) = result |
(uint32_t)*reinterpret_cast<llvm::support::ulittle32_t *>(location);
return 0;
}
return 1;
}
/// \brief Word32_LO: 0x00c03fff : (S + A) : Truncate
int relocLO16(uint8_t *location, uint64_t P, uint64_t S, uint64_t A) {
uint32_t result = (uint32_t)(S + A);
result = lld::scatterBits<int32_t>(result, 0x00c03fff);
*reinterpret_cast<llvm::support::ulittle32_t *>(location) = result |
(uint32_t)*reinterpret_cast<llvm::support::ulittle32_t *>(location);
return 0;
}
/// \brief Word32_LO: 0x00c03fff : (S + A) >> 16 : Truncate
int relocHI16(uint8_t *location, uint64_t P, uint64_t S, uint64_t A) {
uint32_t result = (uint32_t)((S + A)>>16);
result = lld::scatterBits<int32_t>(result, 0x00c03fff);
*reinterpret_cast<llvm::support::ulittle32_t *>(location) = result |
(uint32_t)*reinterpret_cast<llvm::support::ulittle32_t *>(location);
return 0;
}
/// \brief Word32: 0xffffffff : (S + A) : Truncate
int reloc32(uint8_t *location, uint64_t P, uint64_t S, uint64_t A) {
uint32_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;
}
} // end anon namespace
ErrorOr<void> HexagonTargetRelocationHandler::applyRelocation(
ELFWriter &writer, llvm::FileOutputBuffer &buf, const 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();
switch (ref.kind()) {
case R_HEX_B22_PCREL:
relocB22PCREL(location, relocVAddress, targetVAddress, ref.addend());
break;
case R_HEX_B15_PCREL:
relocB15PCREL(location, relocVAddress, targetVAddress, ref.addend());
break;
case R_HEX_LO16:
relocLO16(location, relocVAddress, targetVAddress, ref.addend());
break;
case R_HEX_HI16:
relocHI16(location, relocVAddress, targetVAddress, ref.addend());
break;
case R_HEX_32:
reloc32(location, relocVAddress, targetVAddress, ref.addend());
break;
default: {
std::string str;
llvm::raw_string_ostream s(str);
auto name = _targetInfo.stringFromRelocKind(ref.kind());
s << "Unhandled relocation: "
<< (name ? *name : "<unknown>" ) << " (" << ref.kind() << ")";
s.flush();
llvm_unreachable(str.c_str());
}
}
return error_code::success();
}
HexagonTargetHandler::HexagonTargetHandler(HexagonTargetInfo &targetInfo)
: DefaultTargetHandler(targetInfo), _relocationHandler(targetInfo),
_targetLayout(targetInfo) {
}
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