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//===-- PPCAsmBackend.cpp - PPC Assembler Backend -------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "MCTargetDesc/PPCMCTargetDesc.h"
#include "MCTargetDesc/PPCFixupKinds.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/MC/MCFixupKindInfo.h"
#include "llvm/MC/MCMachObjectWriter.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/ELF.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MachO.h"
#include "llvm/Support/TargetRegistry.h"
using namespace llvm;
static uint64_t adjustFixupValue(unsigned Kind, uint64_t Value) {
switch (Kind) {
default:
llvm_unreachable("Unknown fixup kind!");
case FK_Data_1:
case FK_Data_2:
case FK_Data_4:
case FK_Data_8:
case PPC::fixup_ppc_nofixup:
return Value;
case PPC::fixup_ppc_brcond14:
case PPC::fixup_ppc_brcond14abs:
return Value & 0xfffc;
case PPC::fixup_ppc_br24:
case PPC::fixup_ppc_br24abs:
return Value & 0x3fffffc;
case PPC::fixup_ppc_half16:
return Value & 0xffff;
case PPC::fixup_ppc_half16ds:
return Value & 0xfffc;
}
}
static unsigned getFixupKindNumBytes(unsigned Kind) {
switch (Kind) {
default:
llvm_unreachable("Unknown fixup kind!");
case FK_Data_1:
return 1;
case FK_Data_2:
case PPC::fixup_ppc_half16:
case PPC::fixup_ppc_half16ds:
return 2;
case FK_Data_4:
case PPC::fixup_ppc_brcond14:
case PPC::fixup_ppc_brcond14abs:
case PPC::fixup_ppc_br24:
case PPC::fixup_ppc_br24abs:
return 4;
case FK_Data_8:
return 8;
case PPC::fixup_ppc_nofixup:
return 0;
}
}
namespace {
class PPCAsmBackend : public MCAsmBackend {
const Target &TheTarget;
public:
PPCAsmBackend(const Target &T) : MCAsmBackend(), TheTarget(T) {}
unsigned getNumFixupKinds() const { return PPC::NumTargetFixupKinds; }
const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const {
const static MCFixupKindInfo Infos[PPC::NumTargetFixupKinds] = {
// name offset bits flags
{ "fixup_ppc_br24", 6, 24, MCFixupKindInfo::FKF_IsPCRel },
{ "fixup_ppc_brcond14", 16, 14, MCFixupKindInfo::FKF_IsPCRel },
{ "fixup_ppc_br24abs", 6, 24, 0 },
{ "fixup_ppc_brcond14abs", 16, 14, 0 },
{ "fixup_ppc_half16", 0, 16, 0 },
{ "fixup_ppc_half16ds", 0, 14, 0 },
{ "fixup_ppc_nofixup", 0, 0, 0 }
};
if (Kind < FirstTargetFixupKind)
return MCAsmBackend::getFixupKindInfo(Kind);
assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() &&
"Invalid kind!");
return Infos[Kind - FirstTargetFixupKind];
}
void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
uint64_t Value) const {
Value = adjustFixupValue(Fixup.getKind(), Value);
if (!Value) return; // Doesn't change encoding.
unsigned Offset = Fixup.getOffset();
unsigned NumBytes = getFixupKindNumBytes(Fixup.getKind());
// For each byte of the fragment that the fixup touches, mask in the bits
// from the fixup value. The Value has been "split up" into the appropriate
// bitfields above.
for (unsigned i = 0; i != NumBytes; ++i)
Data[Offset + i] |= uint8_t((Value >> ((NumBytes - i - 1)*8)) & 0xff);
}
bool mayNeedRelaxation(const MCInst &Inst) const {
// FIXME.
return false;
}
bool fixupNeedsRelaxation(const MCFixup &Fixup,
uint64_t Value,
const MCRelaxableFragment *DF,
const MCAsmLayout &Layout) const {
// FIXME.
llvm_unreachable("relaxInstruction() unimplemented");
}
void relaxInstruction(const MCInst &Inst, MCInst &Res) const {
// FIXME.
llvm_unreachable("relaxInstruction() unimplemented");
}
bool writeNopData(uint64_t Count, MCObjectWriter *OW) const {
uint64_t NumNops = Count / 4;
for (uint64_t i = 0; i != NumNops; ++i)
OW->Write32(0x60000000);
switch (Count % 4) {
default: break; // No leftover bytes to write
case 1: OW->Write8(0); break;
case 2: OW->Write16(0); break;
case 3: OW->Write16(0); OW->Write8(0); break;
}
return true;
}
unsigned getPointerSize() const {
StringRef Name = TheTarget.getName();
if (Name == "ppc64" || Name == "ppc64le") return 8;
assert(Name == "ppc32" && "Unknown target name!");
return 4;
}
};
} // end anonymous namespace
// FIXME: This should be in a separate file.
namespace {
class DarwinPPCAsmBackend : public PPCAsmBackend {
public:
DarwinPPCAsmBackend(const Target &T) : PPCAsmBackend(T) { }
MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
bool is64 = getPointerSize() == 8;
return createPPCMachObjectWriter(
OS,
/*Is64Bit=*/is64,
(is64 ? MachO::CPU_TYPE_POWERPC64 : MachO::CPU_TYPE_POWERPC),
MachO::CPU_SUBTYPE_POWERPC_ALL);
}
virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
return false;
}
};
class ELFPPCAsmBackend : public PPCAsmBackend {
uint8_t OSABI;
public:
ELFPPCAsmBackend(const Target &T, uint8_t OSABI) :
PPCAsmBackend(T), OSABI(OSABI) { }
MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
bool is64 = getPointerSize() == 8;
return createPPCELFObjectWriter(OS, is64, OSABI);
}
virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
return false;
}
};
} // end anonymous namespace
MCAsmBackend *llvm::createPPCAsmBackend(const Target &T,
const MCRegisterInfo &MRI,
StringRef TT, StringRef CPU) {
if (Triple(TT).isOSDarwin())
return new DarwinPPCAsmBackend(T);
uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(Triple(TT).getOS());
return new ELFPPCAsmBackend(T, OSABI);
}
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