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https://github.com/c64scene-ar/llvm-6502.git
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0d3193ef3c
Support for .text relocations, implementing TargetELFWriter overloaded methods for x86/x86_64. Use a map to track global values to their symbol table indexes Code cleanup and small fixes git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73894 91177308-0d34-0410-b5e6-96231b3b80d8
85 lines
2.3 KiB
C++
85 lines
2.3 KiB
C++
//===-- X86ELFWriterInfo.cpp - ELF Writer Info for the X86 backend --------===//
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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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//
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// This file implements ELF writer information for the X86 backend.
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//
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//===----------------------------------------------------------------------===//
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#include "X86ELFWriterInfo.h"
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#include "X86Relocations.h"
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#include "llvm/Function.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetMachine.h"
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// Implementation of the X86ELFWriterInfo class
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//===----------------------------------------------------------------------===//
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X86ELFWriterInfo::X86ELFWriterInfo(TargetMachine &TM)
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: TargetELFWriterInfo(TM) {
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bool is64Bit = TM.getTargetData()->getPointerSizeInBits() == 64;
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EMachine = is64Bit ? EM_X86_64 : EM_386;
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}
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X86ELFWriterInfo::~X86ELFWriterInfo() {}
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unsigned X86ELFWriterInfo::getRelocationType(unsigned MachineRelTy) const {
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if (is64Bit) {
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switch(MachineRelTy) {
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case X86::reloc_pcrel_word:
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return R_X86_64_PC32;
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case X86::reloc_absolute_word:
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return R_X86_64_32;
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case X86::reloc_absolute_dword:
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return R_X86_64_64;
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case X86::reloc_picrel_word:
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default:
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assert(0 && "unknown relocation type");
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}
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} else {
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switch(MachineRelTy) {
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case X86::reloc_pcrel_word:
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return R_386_PC32;
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case X86::reloc_absolute_word:
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return R_386_32;
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case X86::reloc_absolute_dword:
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case X86::reloc_picrel_word:
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default:
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assert(0 && "unknown relocation type");
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}
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}
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return 0;
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}
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unsigned X86ELFWriterInfo::getFunctionAlignment(const Function *F) const {
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unsigned FnAlign = 4;
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if (F->hasFnAttr(Attribute::OptimizeForSize))
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FnAlign = 1;
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if (F->getAlignment())
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FnAlign = Log2_32(F->getAlignment());
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return (1 << FnAlign);
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}
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long int X86ELFWriterInfo::getAddendForRelTy(unsigned RelTy) const {
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if (is64Bit) {
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switch(RelTy) {
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case R_X86_64_PC32: return -4;
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break;
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default:
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assert(0 && "unknown x86 relocation type");
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}
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}
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return 0;
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}
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