//
//===----------------------------------------------------------------------===//
-#include "llvm/MC/MCAsmBackend.h"
#include "MCTargetDesc/PPCMCTargetDesc.h"
#include "MCTargetDesc/PPCFixupKinds.h"
+#include "llvm/MC/MCAsmBackend.h"
+#include "llvm/MC/MCAssembler.h"
+#include "llvm/MC/MCELF.h"
#include "llvm/MC/MCELFObjectWriter.h"
+#include "llvm/MC/MCFixupKindInfo.h"
#include "llvm/MC/MCMachObjectWriter.h"
-#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCObjectWriter.h"
+#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCValue.h"
-#include "llvm/Object/MachOFormat.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 unsigned adjustFixupValue(unsigned Kind, uint64_t Value) {
+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:
- return Value & 0x3ffc;
+ case PPC::fixup_ppc_brcond14abs:
+ return Value & 0xfffc;
case PPC::fixup_ppc_br24:
+ case PPC::fixup_ppc_br24abs:
return Value & 0x3fffffc;
-#if 0
- case PPC::fixup_ppc_hi16:
- return (Value >> 16) & 0xffff;
-#endif
- case PPC::fixup_ppc_ha16:
- return ((Value >> 16) + ((Value & 0x8000) ? 1 : 0)) & 0xffff;
- case PPC::fixup_ppc_lo16:
+ case PPC::fixup_ppc_half16:
return Value & 0xffff;
+ case PPC::fixup_ppc_half16ds:
+ return Value & 0xfffc;
}
}
-namespace {
-class PPCMachObjectWriter : public MCMachObjectTargetWriter {
-public:
- PPCMachObjectWriter(bool Is64Bit, uint32_t CPUType,
- uint32_t CPUSubtype)
- : MCMachObjectTargetWriter(Is64Bit, CPUType, CPUSubtype) {}
-
- void RecordRelocation(MachObjectWriter *Writer,
- const MCAssembler &Asm, const MCAsmLayout &Layout,
- const MCFragment *Fragment, const MCFixup &Fixup,
- MCValue Target, uint64_t &FixedValue) {}
-};
+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;
+ }
+}
-class PPCELFObjectWriter : public MCELFObjectTargetWriter {
-public:
- PPCELFObjectWriter(bool Is64Bit, Triple::OSType OSType, uint16_t EMachine,
- bool HasRelocationAddend, bool isLittleEndian)
- : MCELFObjectTargetWriter(Is64Bit, OSType, EMachine, HasRelocationAddend) {}
-};
+namespace {
class PPCAsmBackend : public MCAsmBackend {
-const Target &TheTarget;
+ const Target &TheTarget;
+ bool IsLittleEndian;
public:
- PPCAsmBackend(const Target &T) : MCAsmBackend(), TheTarget(T) {}
+ PPCAsmBackend(const Target &T, bool isLittle) : MCAsmBackend(), TheTarget(T),
+ IsLittleEndian(isLittle) {}
- unsigned getNumFixupKinds() const { return PPC::NumTargetFixupKinds; }
+ unsigned getNumFixupKinds() const override {
+ return PPC::NumTargetFixupKinds;
+ }
- const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const {
- const static MCFixupKindInfo Infos[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_lo16", 16, 16, 0 },
- { "fixup_ppc_ha16", 16, 16, 0 },
- { "fixup_ppc_lo14", 16, 14, 0 }
+ { "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 Infos[Kind - FirstTargetFixupKind];
+ return (IsLittleEndian? InfosLE : InfosBE)[Kind - FirstTargetFixupKind];
+ }
+
+ void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
+ uint64_t Value, bool IsPCRel) 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);
+ }
+ }
+
+ void processFixupValue(const MCAssembler &Asm, const MCAsmLayout &Layout,
+ const MCFixup &Fixup, const MCFragment *DF,
+ const MCValue &Target, uint64_t &Value,
+ bool &IsResolved) override {
+ switch ((PPC::Fixups)Fixup.getKind()) {
+ default: break;
+ 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()) {
+ const MCSymbolData &Data = Asm.getSymbolData(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 = MCELF::getOther(Data) << 2;
+ if ((Other & ELF::STO_PPC64_LOCAL_MASK) != 0)
+ IsResolved = false;
+ }
+ break;
+ }
}
-
- bool MayNeedRelaxation(const MCInst &Inst) const {
+
+ bool mayNeedRelaxation(const MCInst &Inst) const override {
// FIXME.
return false;
}
bool fixupNeedsRelaxation(const MCFixup &Fixup,
uint64_t Value,
- const MCInstFragment *DF,
- const MCAsmLayout &Layout) const {
+ const MCRelaxableFragment *DF,
+ const MCAsmLayout &Layout) const override {
// FIXME.
- assert(0 && "RelaxInstruction() unimplemented");
- return false;
+ llvm_unreachable("relaxInstruction() unimplemented");
}
-
- void RelaxInstruction(const MCInst &Inst, MCInst &Res) const {
+
+ void relaxInstruction(const MCInst &Inst, MCInst &Res) const override {
// FIXME.
- assert(0 && "RelaxInstruction() unimplemented");
+ llvm_unreachable("relaxInstruction() unimplemented");
}
-
- bool WriteNopData(uint64_t Count, MCObjectWriter *OW) const {
- // FIXME: Zero fill for now. That's not right, but at least will get the
- // section size right.
- for (uint64_t i = 0; i != Count; ++i)
- OW->Write8(0);
+
+ 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);
+
+ 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") return 8;
+ if (Name == "ppc64" || Name == "ppc64le") return 8;
assert(Name == "ppc32" && "Unknown target name!");
return 4;
}
+
+ bool isLittleEndian() const {
+ return IsLittleEndian;
+ }
};
} // end anonymous namespace
namespace {
class DarwinPPCAsmBackend : public PPCAsmBackend {
public:
- DarwinPPCAsmBackend(const Target &T) : PPCAsmBackend(T) { }
-
- void ApplyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
- uint64_t Value) const {
- assert(0 && "UNIMP");
- }
-
- MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
+ DarwinPPCAsmBackend(const Target &T) : PPCAsmBackend(T, false) { }
+
+ MCObjectWriter *createObjectWriter(raw_pwrite_stream &OS) const override {
bool is64 = getPointerSize() == 8;
- return createMachObjectWriter(new PPCMachObjectWriter(
- /*Is64Bit=*/is64,
- (is64 ? object::mach::CTM_PowerPC64 :
- object::mach::CTM_PowerPC),
- object::mach::CSPPC_ALL),
- OS, /*IsLittleEndian=*/false);
- }
-
- virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
- return false;
+ return createPPCMachObjectWriter(
+ OS,
+ /*Is64Bit=*/is64,
+ (is64 ? MachO::CPU_TYPE_POWERPC64 : MachO::CPU_TYPE_POWERPC),
+ MachO::CPU_SUBTYPE_POWERPC_ALL);
}
};
class ELFPPCAsmBackend : public PPCAsmBackend {
- Triple::OSType OSType;
+ uint8_t OSABI;
public:
- ELFPPCAsmBackend(const Target &T, Triple::OSType OSType) :
- PPCAsmBackend(T), OSType(OSType) { }
-
- 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();
-
- // 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 != 4; ++i)
- Data[Offset + i] |= uint8_t((Value >> ((4 - i - 1)*8)) & 0xff);
- }
-
- MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
+ ELFPPCAsmBackend(const Target &T, bool IsLittleEndian, uint8_t OSABI) :
+ PPCAsmBackend(T, IsLittleEndian), OSABI(OSABI) { }
+
+ MCObjectWriter *createObjectWriter(raw_pwrite_stream &OS) const override {
bool is64 = getPointerSize() == 8;
- return createELFObjectWriter(new PPCELFObjectWriter(
- /*Is64Bit=*/is64,
- OSType,
- is64 ? ELF::EM_PPC64 : ELF::EM_PPC,
- /*addend*/ true, /*isLittleEndian*/ false),
- OS, /*IsLittleEndian=*/false);
- }
-
- virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
- return false;
+ return createPPCELFObjectWriter(OS, is64, isLittleEndian(), OSABI);
}
};
} // end anonymous namespace
-
-
-
-MCAsmBackend *llvm::createPPCAsmBackend(const Target &T, StringRef TT) {
+MCAsmBackend *llvm::createPPCAsmBackend(const Target &T,
+ const MCRegisterInfo &MRI,
+ StringRef TT, StringRef CPU) {
if (Triple(TT).isOSDarwin())
return new DarwinPPCAsmBackend(T);
- return new ELFPPCAsmBackend(T, Triple(TT).getOS());
+ uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(Triple(TT).getOS());
+ bool IsLittleEndian = Triple(TT).getArch() == Triple::ppc64le;
+ return new ELFPPCAsmBackend(T, IsLittleEndian, OSABI);
}
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