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//===-- VEELFObjectWriter.cpp - VE 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 "VEFixupKinds.h"
#include "VEMCExpr.h"
#include "VEMCTargetDesc.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/ErrorHandling.h"
using namespace llvm;
namespace {
class VEELFObjectWriter : public MCELFObjectTargetWriter {
public:
VEELFObjectWriter(uint8_t OSABI)
: MCELFObjectTargetWriter(/* Is64Bit */ true, OSABI, ELF::EM_VE,
/* HasRelocationAddend */ true) {}
~VEELFObjectWriter() override = default;
protected:
unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
const MCFixup &Fixup, bool IsPCRel) const override;
bool needsRelocateWithSymbol(const MCSymbol &Sym,
unsigned Type) const override;
};
} // namespace
unsigned VEELFObjectWriter::getRelocType(MCContext &Ctx, const MCValue &Target,
const MCFixup &Fixup,
bool IsPCRel) const {
if (const VEMCExpr *SExpr = dyn_cast<VEMCExpr>(Fixup.getValue())) {
if (SExpr->getKind() == VEMCExpr::VK_VE_PC_LO32)
return ELF::R_VE_PC_LO32;
}
if (IsPCRel) {
switch (Fixup.getTargetKind()) {
default:
Ctx.reportError(Fixup.getLoc(), "Unsupported pc-relative fixup kind");
return ELF::R_VE_NONE;
case FK_Data_1:
case FK_PCRel_1:
Ctx.reportError(Fixup.getLoc(),
"1-byte pc-relative data relocation is not supported");
return ELF::R_VE_NONE;
case FK_Data_2:
case FK_PCRel_2:
Ctx.reportError(Fixup.getLoc(),
"2-byte pc-relative data relocation is not supported");
return ELF::R_VE_NONE;
case FK_Data_4:
case FK_PCRel_4:
return ELF::R_VE_SREL32;
case FK_Data_8:
case FK_PCRel_8:
Ctx.reportError(Fixup.getLoc(),
"8-byte pc-relative data relocation is not supported");
return ELF::R_VE_NONE;
case VE::fixup_ve_reflong:
case VE::fixup_ve_srel32:
return ELF::R_VE_SREL32;
case VE::fixup_ve_pc_hi32:
return ELF::R_VE_PC_HI32;
case VE::fixup_ve_pc_lo32:
return ELF::R_VE_PC_LO32;
}
}
switch (Fixup.getTargetKind()) {
default:
Ctx.reportError(Fixup.getLoc(), "Unknown ELF relocation type");
return ELF::R_VE_NONE;
case FK_Data_1:
Ctx.reportError(Fixup.getLoc(), "1-byte data relocation is not supported");
return ELF::R_VE_NONE;
case FK_Data_2:
Ctx.reportError(Fixup.getLoc(), "2-byte data relocation is not supported");
return ELF::R_VE_NONE;
case FK_Data_4:
return ELF::R_VE_REFLONG;
case FK_Data_8:
return ELF::R_VE_REFQUAD;
case VE::fixup_ve_reflong:
return ELF::R_VE_REFLONG;
case VE::fixup_ve_srel32:
Ctx.reportError(Fixup.getLoc(),
"A non pc-relative srel32 relocation is not supported");
return ELF::R_VE_NONE;
case VE::fixup_ve_hi32:
return ELF::R_VE_HI32;
case VE::fixup_ve_lo32:
return ELF::R_VE_LO32;
case VE::fixup_ve_pc_hi32:
Ctx.reportError(Fixup.getLoc(),
"A non pc-relative pc_hi32 relocation is not supported");
return ELF::R_VE_NONE;
case VE::fixup_ve_pc_lo32:
Ctx.reportError(Fixup.getLoc(),
"A non pc-relative pc_lo32 relocation is not supported");
return ELF::R_VE_NONE;
case VE::fixup_ve_got_hi32:
return ELF::R_VE_GOT_HI32;
case VE::fixup_ve_got_lo32:
return ELF::R_VE_GOT_LO32;
case VE::fixup_ve_gotoff_hi32:
return ELF::R_VE_GOTOFF_HI32;
case VE::fixup_ve_gotoff_lo32:
return ELF::R_VE_GOTOFF_LO32;
case VE::fixup_ve_plt_hi32:
return ELF::R_VE_PLT_HI32;
case VE::fixup_ve_plt_lo32:
return ELF::R_VE_PLT_LO32;
case VE::fixup_ve_tls_gd_hi32:
return ELF::R_VE_TLS_GD_HI32;
case VE::fixup_ve_tls_gd_lo32:
return ELF::R_VE_TLS_GD_LO32;
case VE::fixup_ve_tpoff_hi32:
return ELF::R_VE_TPOFF_HI32;
case VE::fixup_ve_tpoff_lo32:
return ELF::R_VE_TPOFF_LO32;
}
return ELF::R_VE_NONE;
}
bool VEELFObjectWriter::needsRelocateWithSymbol(const MCSymbol &Sym,
unsigned Type) const {
switch (Type) {
default:
return false;
// All relocations that use a GOT need a symbol, not an offset, as
// the offset of the symbol within the section is irrelevant to
// where the GOT entry is. Don't need to list all the TLS entries,
// as they're all marked as requiring a symbol anyways.
case ELF::R_VE_GOT_HI32:
case ELF::R_VE_GOT_LO32:
case ELF::R_VE_GOTOFF_HI32:
case ELF::R_VE_GOTOFF_LO32:
case ELF::R_VE_TLS_GD_HI32:
case ELF::R_VE_TLS_GD_LO32:
return true;
}
}
std::unique_ptr<MCObjectTargetWriter>
llvm::createVEELFObjectWriter(uint8_t OSABI) {
return std::make_unique<VEELFObjectWriter>(OSABI);
}
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