You've already forked linux-packaging-mono
246 lines
8.1 KiB
C++
246 lines
8.1 KiB
C++
|
//===-- 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/PPCFixupKinds.h"
|
||
|
|
#include "MCTargetDesc/PPCMCTargetDesc.h"
|
||
|
|
#include "llvm/BinaryFormat/ELF.h"
|
||
|
|
#include "llvm/BinaryFormat/MachO.h"
|
||
|
|
#include "llvm/MC/MCAsmBackend.h"
|
||
|
|
#include "llvm/MC/MCAssembler.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/MCSubtargetInfo.h"
|
||
|
|
#include "llvm/MC/MCSymbolELF.h"
|
||
|
|
#include "llvm/MC/MCValue.h"
|
||
|
|
#include "llvm/Support/ErrorHandling.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;
|
||
|
|
bool IsLittleEndian;
|
||
|
|
public:
|
||
|
|
PPCAsmBackend(const Target &T, bool isLittle) : MCAsmBackend(), TheTarget(T),
|
||
|
|
IsLittleEndian(isLittle) {}
|
||
|
|
|
||
|
|
unsigned getNumFixupKinds() const override {
|
||
|
|
return PPC::NumTargetFixupKinds;
|
||
|
|
}
|
||
|
|
|
||
|
|
const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override {
|
||
|
|
const static MCFixupKindInfo InfosBE[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 }
|
||
|
|
};
|
||
|
|
const static MCFixupKindInfo InfosLE[PPC::NumTargetFixupKinds] = {
|
||
|
|
// name offset bits flags
|
||
|
|
{ "fixup_ppc_br24", 2, 24, MCFixupKindInfo::FKF_IsPCRel },
|
||
|
|
{ "fixup_ppc_brcond14", 2, 14, MCFixupKindInfo::FKF_IsPCRel },
|
||
|
|
{ "fixup_ppc_br24abs", 2, 24, 0 },
|
||
|
|
{ "fixup_ppc_brcond14abs", 2, 14, 0 },
|
||
|
|
{ "fixup_ppc_half16", 0, 16, 0 },
|
||
|
|
{ "fixup_ppc_half16ds", 2, 14, 0 },
|
||
|
|
{ "fixup_ppc_nofixup", 0, 0, 0 }
|
||
|
|
};
|
||
|
|
|
||
|
|
if (Kind < FirstTargetFixupKind)
|
||
|
|
return MCAsmBackend::getFixupKindInfo(Kind);
|
||
|
|
|
||
|
|
assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() &&
|
||
|
|
"Invalid kind!");
|
||
|
|
return (IsLittleEndian? InfosLE : InfosBE)[Kind - FirstTargetFixupKind];
|
||
|
|
}
|
||
|
|
|
||
|
|
void applyFixup(const MCAssembler &Asm, const MCFixup &Fixup,
|
||
|
|
const MCValue &Target, MutableArrayRef<char> Data,
|
||
|
|
uint64_t Value, bool IsResolved) const override {
|
||
|
|
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) {
|
||
|
|
unsigned Idx = IsLittleEndian ? i : (NumBytes - 1 - i);
|
||
|
|
Data[Offset + i] |= uint8_t((Value >> (Idx * 8)) & 0xff);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
bool shouldForceRelocation(const MCAssembler &Asm, const MCFixup &Fixup,
|
||
|
|
const MCValue &Target) override {
|
||
|
|
switch ((PPC::Fixups)Fixup.getKind()) {
|
||
|
|
default:
|
||
|
|
return false;
|
||
|
|
case PPC::fixup_ppc_br24:
|
||
|
|
case PPC::fixup_ppc_br24abs:
|
||
|
|
// If the target symbol has a local entry point we must not attempt
|
||
|
|
// to resolve the fixup directly. Emit a relocation and leave
|
||
|
|
// resolution of the final target address to the linker.
|
||
|
|
if (const MCSymbolRefExpr *A = Target.getSymA()) {
|
||
|
|
if (const auto *S = dyn_cast<MCSymbolELF>(&A->getSymbol())) {
|
||
|
|
// The "other" values are stored in the last 6 bits of the second
|
||
|
|
// byte. The traditional defines for STO values assume the full byte
|
||
|
|
// and thus the shift to pack it.
|
||
|
|
unsigned Other = S->getOther() << 2;
|
||
|
|
if ((Other & ELF::STO_PPC64_LOCAL_MASK) != 0)
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
bool mayNeedRelaxation(const MCInst &Inst) const override {
|
||
|
|
// FIXME.
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool fixupNeedsRelaxation(const MCFixup &Fixup,
|
||
|
|
uint64_t Value,
|
||
|
|
const MCRelaxableFragment *DF,
|
||
|
|
const MCAsmLayout &Layout) const override {
|
||
|
|
// FIXME.
|
||
|
|
llvm_unreachable("relaxInstruction() unimplemented");
|
||
|
|
}
|
||
|
|
|
||
|
|
void relaxInstruction(const MCInst &Inst, const MCSubtargetInfo &STI,
|
||
|
|
MCInst &Res) const override {
|
||
|
|
// FIXME.
|
||
|
|
llvm_unreachable("relaxInstruction() unimplemented");
|
||
|
|
}
|
||
|
|
|
||
|
|
bool writeNopData(uint64_t Count, MCObjectWriter *OW) const override {
|
||
|
|
uint64_t NumNops = Count / 4;
|
||
|
|
for (uint64_t i = 0; i != NumNops; ++i)
|
||
|
|
OW->write32(0x60000000);
|
||
|
|
|
||
|
|
OW->WriteZeros(Count % 4);
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned getPointerSize() const {
|
||
|
|
StringRef Name = TheTarget.getName();
|
||
|
|
if (Name == "ppc64" || Name == "ppc64le") return 8;
|
||
|
|
assert(Name == "ppc32" && "Unknown target name!");
|
||
|
|
return 4;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool isLittleEndian() const {
|
||
|
|
return IsLittleEndian;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
} // end anonymous namespace
|
||
|
|
|
||
|
|
|
||
|
|
// FIXME: This should be in a separate file.
|
||
|
|
namespace {
|
||
|
|
class DarwinPPCAsmBackend : public PPCAsmBackend {
|
||
|
|
public:
|
||
|
|
DarwinPPCAsmBackend(const Target &T) : PPCAsmBackend(T, false) { }
|
||
|
|
|
||
|
|
std::unique_ptr<MCObjectWriter>
|
||
|
|
createObjectWriter(raw_pwrite_stream &OS) const override {
|
||
|
|
bool is64 = getPointerSize() == 8;
|
||
|
|
return createPPCMachObjectWriter(
|
||
|
|
OS,
|
||
|
|
/*Is64Bit=*/is64,
|
||
|
|
(is64 ? MachO::CPU_TYPE_POWERPC64 : MachO::CPU_TYPE_POWERPC),
|
||
|
|
MachO::CPU_SUBTYPE_POWERPC_ALL);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
class ELFPPCAsmBackend : public PPCAsmBackend {
|
||
|
|
uint8_t OSABI;
|
||
|
|
public:
|
||
|
|
ELFPPCAsmBackend(const Target &T, bool IsLittleEndian, uint8_t OSABI) :
|
||
|
|
PPCAsmBackend(T, IsLittleEndian), OSABI(OSABI) { }
|
||
|
|
|
||
|
|
std::unique_ptr<MCObjectWriter>
|
||
|
|
createObjectWriter(raw_pwrite_stream &OS) const override {
|
||
|
|
bool is64 = getPointerSize() == 8;
|
||
|
|
return createPPCELFObjectWriter(OS, is64, isLittleEndian(), OSABI);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
} // end anonymous namespace
|
||
|
|
|
||
|
|
MCAsmBackend *llvm::createPPCAsmBackend(const Target &T,
|
||
|
|
const MCSubtargetInfo &STI,
|
||
|
|
const MCRegisterInfo &MRI,
|
||
|
|
const MCTargetOptions &Options) {
|
||
|
|
const Triple &TT = STI.getTargetTriple();
|
||
|
|
if (TT.isOSDarwin())
|
||
|
|
return new DarwinPPCAsmBackend(T);
|
||
|
|
|
||
|
|
uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(TT.getOS());
|
||
|
|
bool IsLittleEndian = TT.getArch() == Triple::ppc64le;
|
||
|
|
return new ELFPPCAsmBackend(T, IsLittleEndian, OSABI);
|
||
|
|
}
|