forked from OSchip/llvm-project
242 lines
7.5 KiB
C++
242 lines
7.5 KiB
C++
//===-- X86ELFObjectWriter.cpp - X86 ELF Writer ---------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "MCTargetDesc/X86FixupKinds.h"
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#include "MCTargetDesc/X86MCTargetDesc.h"
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#include "llvm/MC/MCELFObjectWriter.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCValue.h"
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#include "llvm/Support/ELF.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 X86ELFObjectWriter : public MCELFObjectTargetWriter {
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public:
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X86ELFObjectWriter(bool IsELF64, uint8_t OSABI, uint16_t EMachine);
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virtual ~X86ELFObjectWriter();
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protected:
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virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
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bool IsPCRel, bool IsRelocWithSymbol,
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int64_t Addend) const;
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};
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}
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X86ELFObjectWriter::X86ELFObjectWriter(bool IsELF64, uint8_t OSABI,
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uint16_t EMachine)
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: MCELFObjectTargetWriter(IsELF64, OSABI, EMachine,
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// Only i386 uses Rel instead of RelA.
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/*HasRelocationAddend*/ EMachine != ELF::EM_386) {}
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X86ELFObjectWriter::~X86ELFObjectWriter()
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{}
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unsigned X86ELFObjectWriter::GetRelocType(const MCValue &Target,
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const MCFixup &Fixup,
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bool IsPCRel,
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bool IsRelocWithSymbol,
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int64_t Addend) const {
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// determine the type of the relocation
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MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
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MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
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unsigned Type;
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if (getEMachine() == ELF::EM_X86_64) {
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if (IsPCRel) {
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switch ((unsigned)Fixup.getKind()) {
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default: llvm_unreachable("invalid fixup kind!");
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case FK_Data_8: Type = ELF::R_X86_64_PC64; break;
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case FK_Data_4: Type = ELF::R_X86_64_PC32; break;
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case FK_Data_2: Type = ELF::R_X86_64_PC16; break;
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case FK_PCRel_8:
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assert(Modifier == MCSymbolRefExpr::VK_None);
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Type = ELF::R_X86_64_PC64;
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break;
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case X86::reloc_signed_4byte:
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case X86::reloc_riprel_4byte_movq_load:
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case X86::reloc_riprel_4byte:
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case FK_PCRel_4:
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switch (Modifier) {
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default:
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llvm_unreachable("Unimplemented");
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case MCSymbolRefExpr::VK_None:
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Type = ELF::R_X86_64_PC32;
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break;
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case MCSymbolRefExpr::VK_PLT:
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Type = ELF::R_X86_64_PLT32;
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break;
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case MCSymbolRefExpr::VK_GOTPCREL:
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Type = ELF::R_X86_64_GOTPCREL;
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break;
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case MCSymbolRefExpr::VK_GOTTPOFF:
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Type = ELF::R_X86_64_GOTTPOFF;
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break;
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case MCSymbolRefExpr::VK_TLSGD:
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Type = ELF::R_X86_64_TLSGD;
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break;
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case MCSymbolRefExpr::VK_TLSLD:
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Type = ELF::R_X86_64_TLSLD;
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break;
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}
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break;
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case FK_PCRel_2:
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assert(Modifier == MCSymbolRefExpr::VK_None);
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Type = ELF::R_X86_64_PC16;
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break;
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case FK_PCRel_1:
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assert(Modifier == MCSymbolRefExpr::VK_None);
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Type = ELF::R_X86_64_PC8;
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break;
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}
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} else {
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switch ((unsigned)Fixup.getKind()) {
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default: llvm_unreachable("invalid fixup kind!");
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case FK_Data_8:
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switch (Modifier) {
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default:
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llvm_unreachable("Unimplemented");
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case MCSymbolRefExpr::VK_None:
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Type = ELF::R_X86_64_64;
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break;
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case MCSymbolRefExpr::VK_TPOFF:
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Type = ELF::R_X86_64_TPOFF64;
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break;
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case MCSymbolRefExpr::VK_DTPOFF:
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Type = ELF::R_X86_64_DTPOFF64;
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break;
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}
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break;
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case X86::reloc_signed_4byte:
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switch (Modifier) {
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default:
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llvm_unreachable("Unimplemented");
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case MCSymbolRefExpr::VK_None:
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Type = ELF::R_X86_64_32S;
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break;
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case MCSymbolRefExpr::VK_GOT:
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Type = ELF::R_X86_64_GOT32;
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break;
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case MCSymbolRefExpr::VK_GOTPCREL:
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Type = ELF::R_X86_64_GOTPCREL;
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break;
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case MCSymbolRefExpr::VK_TPOFF:
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Type = ELF::R_X86_64_TPOFF32;
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break;
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case MCSymbolRefExpr::VK_DTPOFF:
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Type = ELF::R_X86_64_DTPOFF32;
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break;
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}
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break;
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case FK_Data_4:
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Type = ELF::R_X86_64_32;
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break;
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case FK_Data_2: Type = ELF::R_X86_64_16; break;
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case FK_PCRel_1:
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case FK_Data_1: Type = ELF::R_X86_64_8; break;
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}
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}
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} else if (getEMachine() == ELF::EM_386) {
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if (IsPCRel) {
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switch ((unsigned)Fixup.getKind()) {
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default: llvm_unreachable("invalid fixup kind!");
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case X86::reloc_global_offset_table:
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Type = ELF::R_386_GOTPC;
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break;
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case X86::reloc_signed_4byte:
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case FK_PCRel_4:
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case FK_Data_4:
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switch (Modifier) {
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default:
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llvm_unreachable("Unimplemented");
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case MCSymbolRefExpr::VK_None:
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Type = ELF::R_386_PC32;
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break;
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case MCSymbolRefExpr::VK_PLT:
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Type = ELF::R_386_PLT32;
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break;
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}
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break;
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}
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} else {
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switch ((unsigned)Fixup.getKind()) {
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default: llvm_unreachable("invalid fixup kind!");
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case X86::reloc_global_offset_table:
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Type = ELF::R_386_GOTPC;
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break;
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// FIXME: Should we avoid selecting reloc_signed_4byte in 32 bit mode
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// instead?
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case X86::reloc_signed_4byte:
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case FK_PCRel_4:
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case FK_Data_4:
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switch (Modifier) {
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default:
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llvm_unreachable("Unimplemented");
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case MCSymbolRefExpr::VK_None:
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Type = ELF::R_386_32;
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break;
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case MCSymbolRefExpr::VK_GOT:
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Type = ELF::R_386_GOT32;
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break;
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case MCSymbolRefExpr::VK_GOTOFF:
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Type = ELF::R_386_GOTOFF;
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break;
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case MCSymbolRefExpr::VK_TLSGD:
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Type = ELF::R_386_TLS_GD;
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break;
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case MCSymbolRefExpr::VK_TPOFF:
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Type = ELF::R_386_TLS_LE_32;
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break;
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case MCSymbolRefExpr::VK_INDNTPOFF:
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Type = ELF::R_386_TLS_IE;
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break;
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case MCSymbolRefExpr::VK_NTPOFF:
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Type = ELF::R_386_TLS_LE;
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break;
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case MCSymbolRefExpr::VK_GOTNTPOFF:
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Type = ELF::R_386_TLS_GOTIE;
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break;
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case MCSymbolRefExpr::VK_TLSLDM:
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Type = ELF::R_386_TLS_LDM;
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break;
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case MCSymbolRefExpr::VK_DTPOFF:
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Type = ELF::R_386_TLS_LDO_32;
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break;
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case MCSymbolRefExpr::VK_GOTTPOFF:
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Type = ELF::R_386_TLS_IE_32;
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break;
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}
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break;
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case FK_Data_2: Type = ELF::R_386_16; break;
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case FK_PCRel_1:
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case FK_Data_1: Type = ELF::R_386_8; break;
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}
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}
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} else
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llvm_unreachable("Unsupported ELF machine type.");
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return Type;
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}
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MCObjectWriter *llvm::createX86ELFObjectWriter(raw_ostream &OS,
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bool IsELF64,
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uint8_t OSABI,
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uint16_t EMachine) {
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MCELFObjectTargetWriter *MOTW =
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new X86ELFObjectWriter(IsELF64, OSABI, EMachine);
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return createELFObjectWriter(MOTW, OS, /*IsLittleEndian=*/true);
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}
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