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//===-- CSKYELFObjectWriter.cpp - CSKY 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 "CSKYFixupKinds.h"
#include "CSKYMCAsmInfo.h"
#include "CSKYMCTargetDesc.h"
#include "MCTargetDesc/CSKYMCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSymbolELF.h"
#define DEBUG_TYPE "csky-elf-object-writer"
using namespace llvm;
namespace {
class CSKYELFObjectWriter : public MCELFObjectTargetWriter {
public:
CSKYELFObjectWriter(uint8_t OSABI = 0)
: MCELFObjectTargetWriter(false, OSABI, ELF::EM_CSKY, true){};
~CSKYELFObjectWriter() {}
unsigned getRelocType(const MCFixup &, const MCValue &,
bool IsPCRel) const override;
bool needsRelocateWithSymbol(const MCValue &, unsigned Type) const override;
};
} // namespace
unsigned CSKYELFObjectWriter::getRelocType(const MCFixup &Fixup,
const MCValue &Target,
bool IsPCRel) const {
const MCExpr *Expr = Fixup.getValue();
// Determine the type of the relocation
auto Kind = Fixup.getKind();
uint8_t Modifier = Target.getSpecifier();
switch (Target.getSpecifier()) {
case CSKY::S_TLSIE:
case CSKY::S_TLSLE:
case CSKY::S_TLSGD:
case CSKY::S_TLSLDM:
case CSKY::S_TLSLDO:
if (auto *SA = Target.getAddSym())
cast<MCSymbolELF>(SA)->setType(ELF::STT_TLS);
break;
default:
break;
}
if (IsPCRel) {
switch (Kind) {
default:
LLVM_DEBUG(dbgs() << "Unknown Kind1 = " << Kind);
reportError(Fixup.getLoc(), "Unsupported relocation type");
return ELF::R_CKCORE_NONE;
case FK_Data_4:
return ELF::R_CKCORE_PCREL32;
case CSKY::fixup_csky_pcrel_uimm16_scale4:
return ELF::R_CKCORE_PCREL_IMM16_4;
case CSKY::fixup_csky_pcrel_uimm8_scale4:
return ELF::R_CKCORE_PCREL_IMM8_4;
case CSKY::fixup_csky_pcrel_imm26_scale2:
return ELF::R_CKCORE_PCREL_IMM26_2;
case CSKY::fixup_csky_pcrel_imm18_scale2:
return ELF::R_CKCORE_PCREL_IMM18_2;
case CSKY::fixup_csky_pcrel_imm16_scale2:
return ELF::R_CKCORE_PCREL_IMM16_2;
case CSKY::fixup_csky_pcrel_imm10_scale2:
return ELF::R_CKCORE_PCREL_IMM10_2;
case CSKY::fixup_csky_pcrel_uimm7_scale4:
return ELF::R_CKCORE_PCREL_IMM7_4;
}
}
switch (Kind) {
default:
LLVM_DEBUG(dbgs() << "Unknown Kind2 = " << Kind);
reportError(Fixup.getLoc(), "Unsupported relocation type");
return ELF::R_CKCORE_NONE;
case FK_Data_1:
reportError(Fixup.getLoc(), "1-byte data relocations not supported");
return ELF::R_CKCORE_NONE;
case FK_Data_2:
reportError(Fixup.getLoc(), "2-byte data relocations not supported");
return ELF::R_CKCORE_NONE;
case FK_Data_4:
if (Expr->getKind() == MCExpr::Specifier) {
auto TK = cast<MCSpecifierExpr>(Expr)->getSpecifier();
if (TK == CSKY::S_ADDR)
return ELF::R_CKCORE_ADDR32;
if (TK == CSKY::S_GOT)
return ELF::R_CKCORE_GOT32;
if (TK == CSKY::S_GOTOFF)
return ELF::R_CKCORE_GOTOFF;
if (TK == CSKY::S_PLT)
return ELF::R_CKCORE_PLT32;
if (TK == CSKY::S_TLSIE)
return ELF::R_CKCORE_TLS_IE32;
if (TK == CSKY::S_TLSLE)
return ELF::R_CKCORE_TLS_LE32;
if (TK == CSKY::S_TLSGD)
return ELF::R_CKCORE_TLS_GD32;
if (TK == CSKY::S_TLSLDM)
return ELF::R_CKCORE_TLS_LDM32;
if (TK == CSKY::S_TLSLDO)
return ELF::R_CKCORE_TLS_LDO32;
if (TK == CSKY::S_GOTPC)
return ELF::R_CKCORE_GOTPC;
if (TK == CSKY::S_None)
return ELF::R_CKCORE_ADDR32;
LLVM_DEBUG(dbgs() << "Unknown FK_Data_4 TK = " << TK);
reportError(Fixup.getLoc(), "unknown target FK_Data_4");
} else {
switch (Modifier) {
default:
reportError(Fixup.getLoc(), "invalid fixup for 4-byte data relocation");
return ELF::R_CKCORE_NONE;
case CSKY::S_GOT:
return ELF::R_CKCORE_GOT32;
case CSKY::S_GOTOFF:
return ELF::R_CKCORE_GOTOFF;
case CSKY::S_PLT:
return ELF::R_CKCORE_PLT32;
case CSKY::S_TLSGD:
return ELF::R_CKCORE_TLS_GD32;
case CSKY::S_TLSLDM:
return ELF::R_CKCORE_TLS_LDM32;
case CSKY::S_TPOFF:
return ELF::R_CKCORE_TLS_LE32;
case CSKY::S_None:
return ELF::R_CKCORE_ADDR32;
}
}
return ELF::R_CKCORE_NONE;
case FK_Data_8:
reportError(Fixup.getLoc(), "8-byte data relocations not supported");
return ELF::R_CKCORE_NONE;
case CSKY::fixup_csky_addr32:
return ELF::R_CKCORE_ADDR32;
case CSKY::fixup_csky_addr_hi16:
return ELF::R_CKCORE_ADDR_HI16;
case CSKY::fixup_csky_addr_lo16:
return ELF::R_CKCORE_ADDR_LO16;
case CSKY::fixup_csky_doffset_imm18:
return ELF::R_CKCORE_DOFFSET_IMM18;
case CSKY::fixup_csky_doffset_imm18_scale2:
return ELF::R_CKCORE_DOFFSET_IMM18_2;
case CSKY::fixup_csky_doffset_imm18_scale4:
return ELF::R_CKCORE_DOFFSET_IMM18_4;
case CSKY::fixup_csky_got_imm18_scale4:
return ELF::R_CKCORE_GOT_IMM18_4;
case CSKY::fixup_csky_plt_imm18_scale4:
return ELF::R_CKCORE_PLT_IMM18_4;
}
}
bool CSKYELFObjectWriter::needsRelocateWithSymbol(const MCValue &V,
unsigned Type) const {
switch (V.getSpecifier()) {
case CSKY::S_PLT:
case CSKY::S_GOT:
return true;
default:
return false;
}
}
std::unique_ptr<MCObjectTargetWriter> llvm::createCSKYELFObjectWriter() {
return std::make_unique<CSKYELFObjectWriter>();
}
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