1 //===- AMDGPUELFObjectWriter.cpp - AMDGPU ELF Writer ----------------------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 #include "AMDGPUFixupKinds.h"
10 #include "AMDGPUMCTargetDesc.h"
11 #include "llvm/MC/MCContext.h"
12 #include "llvm/MC/MCELFObjectWriter.h"
13 #include "llvm/MC/MCValue.h"
19 class AMDGPUELFObjectWriter : public MCELFObjectTargetWriter {
21 AMDGPUELFObjectWriter(bool Is64Bit, uint8_t OSABI, bool HasRelocationAddend,
25 unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
26 const MCFixup &Fixup, bool IsPCRel) const override;
30 } // end anonymous namespace
32 AMDGPUELFObjectWriter::AMDGPUELFObjectWriter(bool Is64Bit,
34 bool HasRelocationAddend,
36 : MCELFObjectTargetWriter(Is64Bit, OSABI, ELF::EM_AMDGPU,
37 HasRelocationAddend, ABIVersion) {}
39 unsigned AMDGPUELFObjectWriter::getRelocType(MCContext &Ctx,
40 const MCValue &Target,
43 if (const auto *SymA = Target.getSymA()) {
44 // SCRATCH_RSRC_DWORD[01] is a special global variable that represents
45 // the scratch buffer.
46 if (SymA->getSymbol().getName() == "SCRATCH_RSRC_DWORD0" ||
47 SymA->getSymbol().getName() == "SCRATCH_RSRC_DWORD1")
48 return ELF::R_AMDGPU_ABS32_LO;
51 switch (Target.getAccessVariant()) {
54 case MCSymbolRefExpr::VK_GOTPCREL:
55 return ELF::R_AMDGPU_GOTPCREL;
56 case MCSymbolRefExpr::VK_AMDGPU_GOTPCREL32_LO:
57 return ELF::R_AMDGPU_GOTPCREL32_LO;
58 case MCSymbolRefExpr::VK_AMDGPU_GOTPCREL32_HI:
59 return ELF::R_AMDGPU_GOTPCREL32_HI;
60 case MCSymbolRefExpr::VK_AMDGPU_REL32_LO:
61 return ELF::R_AMDGPU_REL32_LO;
62 case MCSymbolRefExpr::VK_AMDGPU_REL32_HI:
63 return ELF::R_AMDGPU_REL32_HI;
64 case MCSymbolRefExpr::VK_AMDGPU_REL64:
65 return ELF::R_AMDGPU_REL64;
68 MCFixupKind Kind = Fixup.getKind();
69 if (Kind >= FirstLiteralRelocationKind)
70 return Kind - FirstLiteralRelocationKind;
74 return ELF::R_AMDGPU_REL32;
77 return IsPCRel ? ELF::R_AMDGPU_REL32 : ELF::R_AMDGPU_ABS32;
79 return IsPCRel ? ELF::R_AMDGPU_REL64 : ELF::R_AMDGPU_ABS64;
82 if (Fixup.getTargetKind() == AMDGPU::fixup_si_sopp_br) {
83 const auto *SymA = Target.getSymA();
86 if (SymA->getSymbol().isUndefined()) {
87 Ctx.reportError(Fixup.getLoc(), Twine("undefined label '") +
88 SymA->getSymbol().getName() + "'");
89 return ELF::R_AMDGPU_NONE;
91 return ELF::R_AMDGPU_REL16;
94 llvm_unreachable("unhandled relocation type");
97 std::unique_ptr<MCObjectTargetWriter>
98 llvm::createAMDGPUELFObjectWriter(bool Is64Bit, uint8_t OSABI,
99 bool HasRelocationAddend,
100 uint8_t ABIVersion) {
101 return std::make_unique<AMDGPUELFObjectWriter>(Is64Bit, OSABI,