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//===-- Hexagon.cpp -------------------------------------------------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "InputFiles.h"
#include "Symbols.h"
#include "Target.h"
#include "lld/Common/ErrorHandler.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/Object/ELF.h"
#include "llvm/Support/Endian.h"
using namespace llvm;
using namespace llvm::object;
using namespace llvm::support::endian;
using namespace llvm::ELF;
using namespace lld;
using namespace lld::elf;
namespace {
class Hexagon final : public TargetInfo {
public:
uint32_t calcEFlags() const override;
RelExpr getRelExpr(RelType Type, const Symbol &S,
const uint8_t *Loc) const override;
void relocateOne(uint8_t *Loc, RelType Type, uint64_t Val) const override;
};
} // namespace
// Support V60 only at the moment.
uint32_t Hexagon::calcEFlags() const { return 0x60; }
static uint32_t applyMask(uint32_t Mask, uint32_t Data) {
uint32_t Result = 0;
size_t Off = 0;
for (size_t Bit = 0; Bit != 32; ++Bit) {
uint32_t ValBit = (Data >> Off) & 1;
uint32_t MaskBit = (Mask >> Bit) & 1;
if (MaskBit) {
Result |= (ValBit << Bit);
++Off;
}
}
return Result;
}
RelExpr Hexagon::getRelExpr(RelType Type, const Symbol &S,
const uint8_t *Loc) const {
switch (Type) {
case R_HEX_B15_PCREL:
case R_HEX_B15_PCREL_X:
case R_HEX_B22_PCREL:
case R_HEX_B22_PCREL_X:
case R_HEX_B32_PCREL_X:
return R_PC;
default:
return R_ABS;
}
}
static void or32le(uint8_t *P, int32_t V) { write32le(P, read32le(P) | V); }
void Hexagon::relocateOne(uint8_t *Loc, RelType Type, uint64_t Val) const {
switch (Type) {
case R_HEX_NONE:
break;
case R_HEX_B15_PCREL:
or32le(Loc, applyMask(0x00df20fe, Val >> 2));
break;
case R_HEX_B15_PCREL_X:
or32le(Loc, applyMask(0x00df20fe, Val & 0x3f));
break;
case R_HEX_B22_PCREL:
or32le(Loc, applyMask(0x1ff3ffe, Val >> 2));
break;
case R_HEX_B22_PCREL_X:
or32le(Loc, applyMask(0x1ff3ffe, Val & 0x3f));
break;
case R_HEX_B32_PCREL_X:
or32le(Loc, applyMask(0x0fff3fff, Val >> 6));
break;
default:
error(getErrorLocation(Loc) + "unrecognized reloc " + toString(Type));
break;
}
}
TargetInfo *elf::getHexagonTargetInfo() {
static Hexagon Target;
return &Target;
}
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