62 lines
2.3 KiB
C++
62 lines
2.3 KiB
C++
//===-- W65816ELFObjectWriter.cpp - W65816 ELF Writer ---------------------===//
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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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//
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// Skeleton ELF object writer. Relocation types will be assigned once the
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// W65816 ELF ABI is finalised.
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//
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//===----------------------------------------------------------------------===//
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#include "MCTargetDesc/W65816FixupKinds.h"
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#include "MCTargetDesc/W65816MCTargetDesc.h"
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#include "llvm/BinaryFormat/ELF.h"
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#include "llvm/MC/MCELFObjectWriter.h"
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#include "llvm/MC/MCFixup.h"
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#include "llvm/MC/MCObjectWriter.h"
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#include "llvm/MC/MCValue.h"
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#include "llvm/Support/ErrorHandling.h"
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using namespace llvm;
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namespace {
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class W65816ELFObjectWriter : public MCELFObjectTargetWriter {
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public:
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// EM_NONE is a placeholder -- the real EM_ value for 65816 will be supplied
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// once the llvm-mos ELF specification is extended for the W65816 target.
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explicit W65816ELFObjectWriter(uint8_t OSABI)
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: MCELFObjectTargetWriter(/*Is64Bit=*/false, OSABI, ELF::EM_NONE,
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/*HasRelocationAddend=*/true) {}
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~W65816ELFObjectWriter() override = default;
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protected:
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unsigned getRelocType(const MCFixup &Fixup, const MCValue &,
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bool IsPCRel) const override {
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// Placeholder relocation numbers. We are using EM_NONE so the full
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// (EM_, R_*) pair is unique; once a real EM_ value is assigned for the
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// W65816 target (see SESSION_STATE.md open question on ELF EM_), swap
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// these for the canonical R_W65816_* names.
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switch (Fixup.getKind()) {
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case W65816::fixup_8: return 1; // R_W65816_IMM8
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case W65816::fixup_16: return 2; // R_W65816_IMM16
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case W65816::fixup_24: return 3; // R_W65816_IMM24
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case W65816::fixup_8_pcrel: return 4; // R_W65816_PCREL8
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case W65816::fixup_16_pcrel: return 5; // R_W65816_PCREL16
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default:
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llvm_unreachable("W65816: unknown fixup kind");
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}
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}
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};
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} // end anonymous namespace
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std::unique_ptr<MCObjectTargetWriter>
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llvm::createW65816ELFObjectWriter(uint8_t OSABI) {
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return std::make_unique<W65816ELFObjectWriter>(OSABI);
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}
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