AMDGPU.cpp
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//===- AMDGPU.cpp ---------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "InputFiles.h"
#include "Symbols.h"
#include "Target.h"
#include "lld/Common/ErrorHandler.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 AMDGPU final : public TargetInfo {
public:
AMDGPU();
uint32_t calcEFlags() const override;
void relocate(uint8_t *loc, const Relocation &rel,
uint64_t val) const override;
RelExpr getRelExpr(RelType type, const Symbol &s,
const uint8_t *loc) const override;
RelType getDynRel(RelType type) const override;
};
} // namespace
AMDGPU::AMDGPU() {
relativeRel = R_AMDGPU_RELATIVE64;
gotRel = R_AMDGPU_ABS64;
noneRel = R_AMDGPU_NONE;
symbolicRel = R_AMDGPU_ABS64;
}
static uint32_t getEFlags(InputFile *file) {
return cast<ObjFile<ELF64LE>>(file)->getObj().getHeader().e_flags;
}
uint32_t AMDGPU::calcEFlags() const {
assert(!objectFiles.empty());
uint32_t ret = getEFlags(objectFiles[0]);
// Verify that all input files have the same e_flags.
for (InputFile *f : makeArrayRef(objectFiles).slice(1)) {
if (ret == getEFlags(f))
continue;
error("incompatible e_flags: " + toString(f));
return 0;
}
return ret;
}
void AMDGPU::relocate(uint8_t *loc, const Relocation &rel, uint64_t val) const {
switch (rel.type) {
case R_AMDGPU_ABS32:
case R_AMDGPU_GOTPCREL:
case R_AMDGPU_GOTPCREL32_LO:
case R_AMDGPU_REL32:
case R_AMDGPU_REL32_LO:
write32le(loc, val);
break;
case R_AMDGPU_ABS64:
case R_AMDGPU_REL64:
write64le(loc, val);
break;
case R_AMDGPU_GOTPCREL32_HI:
case R_AMDGPU_REL32_HI:
write32le(loc, val >> 32);
break;
default:
llvm_unreachable("unknown relocation");
}
}
RelExpr AMDGPU::getRelExpr(RelType type, const Symbol &s,
const uint8_t *loc) const {
switch (type) {
case R_AMDGPU_ABS32:
case R_AMDGPU_ABS64:
return R_ABS;
case R_AMDGPU_REL32:
case R_AMDGPU_REL32_LO:
case R_AMDGPU_REL32_HI:
case R_AMDGPU_REL64:
return R_PC;
case R_AMDGPU_GOTPCREL:
case R_AMDGPU_GOTPCREL32_LO:
case R_AMDGPU_GOTPCREL32_HI:
return R_GOT_PC;
default:
error(getErrorLocation(loc) + "unknown relocation (" + Twine(type) +
") against symbol " + toString(s));
return R_NONE;
}
}
RelType AMDGPU::getDynRel(RelType type) const {
if (type == R_AMDGPU_ABS64)
return type;
return R_AMDGPU_NONE;
}
TargetInfo *elf::getAMDGPUTargetInfo() {
static AMDGPU target;
return ⌖
}