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//===- lib/ReaderWriter/ELF/HexagonReference.cpp ----------------------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "ReferenceKinds.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/ELF.h"
namespace lld {
namespace elf {
//===----------------------------------------------------------------------===//
// HexagonKindHandler
// TODO: more to do here
//===----------------------------------------------------------------------===//
HexagonKindHandler::~HexagonKindHandler() {
}
/// \brief The following relocation routines are derived from the
/// Hexagon ABI specification, Section 11.6: Relocation
/// 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.
namespace hexagon {
int relocNONE(uint8_t *location, uint64_t P, uint64_t S, uint64_t A) {
return HexagonKindHandler::NoError;
}
/// \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 = ((result<<1) & 0x3ffe) | ((result<<3) & 0x01ff0000);
*reinterpret_cast<llvm::support::ulittle32_t *>(location) = result |
(uint32_t)*reinterpret_cast<llvm::support::ulittle32_t *>(location);
return HexagonKindHandler::NoError;
}
return HexagonKindHandler::Overflow;
}
/// \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 = ((result<<1) & 0x20fe) | ((result<<7) & 0x00df0000);
*reinterpret_cast<llvm::support::ulittle32_t *>(location) = result |
(uint32_t)*reinterpret_cast<llvm::support::ulittle32_t *>(location);
return HexagonKindHandler::NoError;
}
return HexagonKindHandler::Overflow;
}
/// \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 = ((result & 0x3fff) | ((result << 8) & 0x00c00000));
*reinterpret_cast<llvm::support::ulittle32_t *>(location) = result |
(uint32_t)*reinterpret_cast<llvm::support::ulittle32_t *>(location);
return HexagonKindHandler::NoError;
}
/// \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 = ((result & 0x3fff) | ((result << 8) & 0x00c00000));
*reinterpret_cast<llvm::support::ulittle32_t *>(location) = result |
(uint32_t)*reinterpret_cast<llvm::support::ulittle32_t *>(location);
return HexagonKindHandler::NoError;
}
/// \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 HexagonKindHandler::NoError;
}
} // namespace hexagon
HexagonKindHandler::HexagonKindHandler(){
_fixupHandler[llvm::ELF::R_HEX_B22_PCREL] = hexagon::relocB22PCREL;
_fixupHandler[llvm::ELF::R_HEX_B15_PCREL] = hexagon::relocB15PCREL;
_fixupHandler[llvm::ELF::R_HEX_LO16] = hexagon::relocLO16;
_fixupHandler[llvm::ELF::R_HEX_HI16] = hexagon::relocHI16;
_fixupHandler[llvm::ELF::R_HEX_32] = hexagon::reloc32;
}
Reference::Kind HexagonKindHandler::stringToKind(StringRef str) {
return llvm::StringSwitch<Reference::Kind>(str)
.Case("none", none)
.Case("R_HEX_B22_PCREL", llvm::ELF::R_HEX_B22_PCREL)
.Case("R_HEX_B15_PCREL", llvm::ELF::R_HEX_B15_PCREL)
.Case("R_HEX_LO16", llvm::ELF::R_HEX_LO16)
.Case("R_HEX_HI16", llvm::ELF::R_HEX_HI16)
.Case("R_HEX_32", llvm::ELF::R_HEX_32)
.Default(invalid);
}
StringRef HexagonKindHandler::kindToString(Reference::Kind kind) {
switch (static_cast<int32_t>(kind)) {
case llvm::ELF::R_HEX_B22_PCREL:
return "R_HEX_B22_PCREL";
case llvm::ELF::R_HEX_B15_PCREL:
return "R_HEX_B15_PCREL";
case llvm::ELF::R_HEX_LO16:
return "R_HEX_LO16";
case llvm::ELF::R_HEX_HI16:
return "R_HEX_HI16";
case llvm::ELF::R_HEX_32:
return "R_HEX_32";
default:
return "none";
}
}
bool HexagonKindHandler::isCallSite(Kind kind) {
llvm_unreachable("Unimplemented: HexagonKindHandler::isCallSite");
return false;
}
bool HexagonKindHandler::isPointer(Kind kind) {
llvm_unreachable("Unimplemented: HexagonKindHandler::isPointer");
return false;
}
bool HexagonKindHandler::isLazyImmediate(Kind kind) {
llvm_unreachable("Unimplemented: HexagonKindHandler::isLazyImmediate");
return false;
}
bool HexagonKindHandler::isLazyTarget(Kind kind) {
llvm_unreachable("Unimplemented: HexagonKindHandler::isLazyTarget");
return false;
}
void HexagonKindHandler::applyFixup(int32_t reloc, uint64_t addend,
uint8_t *location, uint64_t fixupAddress,
uint64_t targetAddress) {
int error;
if (_fixupHandler[reloc])
{
error = (_fixupHandler[reloc])(location,
fixupAddress, targetAddress, addend);
switch ((RelocationError)error) {
case NoError:
return;
case Overflow:
llvm::report_fatal_error("applyFixup relocation overflow");
return;
}
}
}
} // namespace elf
} // namespace lld
|
