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