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//===-- AVRELFObjectWriter.cpp - AVR ELF Writer ---------------------------===//
//
// 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 "MCTargetDesc/AVRFixupKinds.h"
#include "MCTargetDesc/AVRMCExpr.h"
#include "MCTargetDesc/AVRMCTargetDesc.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/ErrorHandling.h"
namespace llvm {
/// Writes AVR machine code into an ELF32 object file.
class AVRELFObjectWriter : public MCELFObjectTargetWriter {
public:
AVRELFObjectWriter(uint8_t OSABI);
virtual ~AVRELFObjectWriter() = default;
unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
const MCFixup &Fixup, bool IsPCRel) const override;
};
AVRELFObjectWriter::AVRELFObjectWriter(uint8_t OSABI)
: MCELFObjectTargetWriter(false, OSABI, ELF::EM_AVR, true) {}
unsigned AVRELFObjectWriter::getRelocType(MCContext &Ctx, const MCValue &Target,
const MCFixup &Fixup,
bool IsPCRel) const {
const unsigned Kind = Fixup.getTargetKind();
if (Kind >= FirstLiteralRelocationKind)
return Kind - FirstLiteralRelocationKind;
MCSymbolRefExpr::VariantKind Modifier = Target.getAccessVariant();
switch ((unsigned)Fixup.getKind()) {
case FK_Data_1:
switch (Modifier) {
default:
llvm_unreachable("Unsupported Modifier");
case MCSymbolRefExpr::VK_None:
return ELF::R_AVR_8;
case MCSymbolRefExpr::VK_AVR_DIFF8:
return ELF::R_AVR_DIFF8;
case MCSymbolRefExpr::VK_AVR_LO8:
return ELF::R_AVR_8_LO8;
case MCSymbolRefExpr::VK_AVR_HI8:
return ELF::R_AVR_8_HI8;
case MCSymbolRefExpr::VK_AVR_HLO8:
return ELF::R_AVR_8_HLO8;
}
case FK_Data_4:
switch (Modifier) {
default:
llvm_unreachable("Unsupported Modifier");
case MCSymbolRefExpr::VK_None:
return ELF::R_AVR_32;
case MCSymbolRefExpr::VK_AVR_DIFF32:
return ELF::R_AVR_DIFF32;
}
case FK_Data_2:
switch (Modifier) {
default:
llvm_unreachable("Unsupported Modifier");
case MCSymbolRefExpr::VK_None:
return ELF::R_AVR_16;
case MCSymbolRefExpr::VK_AVR_NONE:
case MCSymbolRefExpr::VK_AVR_PM:
return ELF::R_AVR_16_PM;
case MCSymbolRefExpr::VK_AVR_DIFF16:
return ELF::R_AVR_DIFF16;
}
case AVR::fixup_32:
return ELF::R_AVR_32;
case AVR::fixup_7_pcrel:
return ELF::R_AVR_7_PCREL;
case AVR::fixup_13_pcrel:
return ELF::R_AVR_13_PCREL;
case AVR::fixup_16:
return ELF::R_AVR_16;
case AVR::fixup_16_pm:
return ELF::R_AVR_16_PM;
case AVR::fixup_lo8_ldi:
return ELF::R_AVR_LO8_LDI;
case AVR::fixup_hi8_ldi:
return ELF::R_AVR_HI8_LDI;
case AVR::fixup_hh8_ldi:
return ELF::R_AVR_HH8_LDI;
case AVR::fixup_lo8_ldi_neg:
return ELF::R_AVR_LO8_LDI_NEG;
case AVR::fixup_hi8_ldi_neg:
return ELF::R_AVR_HI8_LDI_NEG;
case AVR::fixup_hh8_ldi_neg:
return ELF::R_AVR_HH8_LDI_NEG;
case AVR::fixup_lo8_ldi_pm:
return ELF::R_AVR_LO8_LDI_PM;
case AVR::fixup_hi8_ldi_pm:
return ELF::R_AVR_HI8_LDI_PM;
case AVR::fixup_hh8_ldi_pm:
return ELF::R_AVR_HH8_LDI_PM;
case AVR::fixup_lo8_ldi_pm_neg:
return ELF::R_AVR_LO8_LDI_PM_NEG;
case AVR::fixup_hi8_ldi_pm_neg:
return ELF::R_AVR_HI8_LDI_PM_NEG;
case AVR::fixup_hh8_ldi_pm_neg:
return ELF::R_AVR_HH8_LDI_PM_NEG;
case AVR::fixup_call:
return ELF::R_AVR_CALL;
case AVR::fixup_ldi:
return ELF::R_AVR_LDI;
case AVR::fixup_6:
return ELF::R_AVR_6;
case AVR::fixup_6_adiw:
return ELF::R_AVR_6_ADIW;
case AVR::fixup_ms8_ldi:
return ELF::R_AVR_MS8_LDI;
case AVR::fixup_ms8_ldi_neg:
return ELF::R_AVR_MS8_LDI_NEG;
case AVR::fixup_lo8_ldi_gs:
return ELF::R_AVR_LO8_LDI_GS;
case AVR::fixup_hi8_ldi_gs:
return ELF::R_AVR_HI8_LDI_GS;
case AVR::fixup_8:
return ELF::R_AVR_8;
case AVR::fixup_8_lo8:
return ELF::R_AVR_8_LO8;
case AVR::fixup_8_hi8:
return ELF::R_AVR_8_HI8;
case AVR::fixup_8_hlo8:
return ELF::R_AVR_8_HLO8;
case AVR::fixup_diff8:
return ELF::R_AVR_DIFF8;
case AVR::fixup_diff16:
return ELF::R_AVR_DIFF16;
case AVR::fixup_diff32:
return ELF::R_AVR_DIFF32;
case AVR::fixup_lds_sts_16:
return ELF::R_AVR_LDS_STS_16;
case AVR::fixup_port6:
return ELF::R_AVR_PORT6;
case AVR::fixup_port5:
return ELF::R_AVR_PORT5;
default:
llvm_unreachable("invalid fixup kind!");
}
}
std::unique_ptr<MCObjectTargetWriter> createAVRELFObjectWriter(uint8_t OSABI) {
return std::make_unique<AVRELFObjectWriter>(OSABI);
}
} // end of namespace llvm
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