X86ELFRelocationInfo.cpp [plain text]
#include "MCTargetDesc/X86MCTargetDesc.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCRelocationInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Object/ELFObjectFile.h"
#include "llvm/Support/ELF.h"
using namespace llvm;
using namespace object;
using namespace ELF;
namespace {
class X86_64ELFRelocationInfo : public MCRelocationInfo {
public:
X86_64ELFRelocationInfo(MCContext &Ctx) : MCRelocationInfo(Ctx) {}
const MCExpr *createExprForRelocation(RelocationRef Rel) override {
uint64_t RelType; Rel.getType(RelType);
symbol_iterator SymI = Rel.getSymbol();
StringRef SymName; SymI->getName(SymName);
uint64_t SymAddr; SymI->getAddress(SymAddr);
uint64_t SymSize; SymI->getSize(SymSize);
int64_t Addend; getELFRelocationAddend(Rel, Addend);
MCSymbol *Sym = Ctx.GetOrCreateSymbol(SymName);
if (Sym->isVariable() == false)
Sym->setVariableValue(MCConstantExpr::Create(SymAddr, Ctx));
const MCExpr *Expr = nullptr;
bool hasAddend = false;
switch(RelType) {
case R_X86_64_NONE:
case R_X86_64_COPY:
break;
case R_X86_64_64:
case R_X86_64_16:
case R_X86_64_8:
case R_X86_64_32:
case R_X86_64_32S:
case R_X86_64_PC32:
case R_X86_64_PC16:
case R_X86_64_PC8:
case R_X86_64_PC64:
hasAddend = true;
Expr = MCSymbolRefExpr::Create(Sym, Ctx);
break;
case R_X86_64_GOT32:
case R_X86_64_GOT64:
case R_X86_64_GOTPC32:
case R_X86_64_GOTPC64:
case R_X86_64_GOTPLT64:
hasAddend = true;
Expr = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_GOT, Ctx);
break;
case R_X86_64_PLT32:
hasAddend = true;
Expr = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_PLT, Ctx);
break;
case R_X86_64_GLOB_DAT:
case R_X86_64_JUMP_SLOT:
Expr = MCSymbolRefExpr::Create(Sym, Ctx);
break;
case R_X86_64_GOTPCREL:
case R_X86_64_GOTPCREL64:
hasAddend = true;
Expr = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_GOTPCREL, Ctx);
break;
case R_X86_64_GOTOFF64:
Expr = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_GOTOFF, Ctx);
break;
case R_X86_64_PLTOFF64:
break;
case R_X86_64_SIZE32:
case R_X86_64_SIZE64:
Expr = MCConstantExpr::Create(SymSize, Ctx);
break;
default:
Expr = MCSymbolRefExpr::Create(Sym, Ctx);
break;
}
if (Expr && hasAddend && Addend != 0)
Expr = MCBinaryExpr::CreateAdd(Expr,
MCConstantExpr::Create(Addend, Ctx),
Ctx);
return Expr;
}
};
}
MCRelocationInfo *llvm::createX86_64ELFRelocationInfo(MCContext &Ctx) {
return new X86_64ELFRelocationInfo(Ctx);
}