#include "llvm/Support/ELF.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MachO.h"
+#include "llvm/Support/TargetParser.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
} // end anonymous namespace
unsigned ARMAsmBackend::getRelaxedOpcode(unsigned Op) const {
- bool HasThumb2 = STI->getFeatureBits() & ARM::FeatureThumb2;
+ bool HasThumb2 = STI->getFeatureBits()[ARM::FeatureThumb2];
switch (Op) {
default:
return false;
}
-bool ARMAsmBackend::fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,
- const MCRelaxableFragment *DF,
- const MCAsmLayout &Layout) const {
+const char *ARMAsmBackend::reasonForFixupRelaxation(const MCFixup &Fixup,
+ uint64_t Value) const {
switch ((unsigned)Fixup.getKind()) {
case ARM::fixup_arm_thumb_br: {
// Relaxing tB to t2B. tB has a signed 12-bit displacement with the
//
// Relax if the value is too big for a (signed) i8.
int64_t Offset = int64_t(Value) - 4;
- return Offset > 2046 || Offset < -2048;
+ if (Offset > 2046 || Offset < -2048)
+ return "out of range pc-relative fixup value";
+ break;
}
case ARM::fixup_arm_thumb_bcc: {
// Relaxing tBcc to t2Bcc. tBcc has a signed 9-bit displacement with the
//
// Relax if the value is too big for a (signed) i8.
int64_t Offset = int64_t(Value) - 4;
- return Offset > 254 || Offset < -256;
+ if (Offset > 254 || Offset < -256)
+ return "out of range pc-relative fixup value";
+ break;
}
case ARM::fixup_thumb_adr_pcrel_10:
case ARM::fixup_arm_thumb_cp: {
// If the immediate is negative, greater than 1020, or not a multiple
// of four, the wide version of the instruction must be used.
int64_t Offset = int64_t(Value) - 4;
- return Offset > 1020 || Offset < 0 || Offset & 3;
+ if (Offset & 3)
+ return "misaligned pc-relative fixup value";
+ else if (Offset > 1020 || Offset < 0)
+ return "out of range pc-relative fixup value";
+ break;
}
- case ARM::fixup_arm_thumb_cb:
+ case ARM::fixup_arm_thumb_cb: {
// If we have a Thumb CBZ or CBNZ instruction and its target is the next
// instruction it is is actually out of range for the instruction.
// It will be changed to a NOP.
int64_t Offset = (Value & ~1);
- return Offset == 2;
+ if (Offset == 2)
+ return "will be converted to nop";
+ break;
+ }
+ default:
+ llvm_unreachable("Unexpected fixup kind in reasonForFixupRelaxation()!");
}
- llvm_unreachable("Unexpected fixup kind in fixupNeedsRelaxation()!");
+ return nullptr;
+}
+
+bool ARMAsmBackend::fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,
+ const MCRelaxableFragment *DF,
+ const MCAsmLayout &Layout) const {
+ return reasonForFixupRelaxation(Fixup, Value);
}
void ARMAsmBackend::relaxInstruction(const MCInst &Inst, MCInst &Res) const {
hasNOP() ? Thumb2_16bitNopEncoding : Thumb1_16bitNopEncoding;
uint64_t NumNops = Count / 2;
for (uint64_t i = 0; i != NumNops; ++i)
- OW->Write16(nopEncoding);
+ OW->write16(nopEncoding);
if (Count & 1)
- OW->Write8(0);
+ OW->write8(0);
return true;
}
// ARM mode
hasNOP() ? ARMv6T2_NopEncoding : ARMv4_NopEncoding;
uint64_t NumNops = Count / 4;
for (uint64_t i = 0; i != NumNops; ++i)
- OW->Write32(nopEncoding);
+ OW->write32(nopEncoding);
// FIXME: should this function return false when unable to write exactly
// 'Count' bytes with NOP encodings?
switch (Count % 4) {
default:
break; // No leftover bytes to write
case 1:
- OW->Write8(0);
+ OW->write8(0);
break;
case 2:
- OW->Write16(0);
+ OW->write16(0);
break;
case 3:
- OW->Write16(0);
- OW->Write8(0xa0);
+ OW->write16(0);
+ OW->write8(0xa0);
break;
}
return Value;
}
-static unsigned adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
- bool IsPCRel, MCContext *Ctx,
- bool IsLittleEndian) {
+unsigned ARMAsmBackend::adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
+ bool IsPCRel, MCContext *Ctx,
+ bool IsLittleEndian,
+ bool IsResolved) const {
unsigned Kind = Fixup.getKind();
switch (Kind) {
default:
isAdd = false;
}
if (Ctx && Value >= 4096)
- Ctx->FatalError(Fixup.getLoc(), "out of range pc-relative fixup value");
+ Ctx->reportFatalError(Fixup.getLoc(), "out of range pc-relative fixup value");
Value |= isAdd << 23;
// Same addressing mode as fixup_arm_pcrel_10,
return Value;
}
- case ARM::fixup_thumb_adr_pcrel_10:
- return ((Value - 4) >> 2) & 0xff;
case ARM::fixup_arm_adr_pcrel_12: {
// ARM PC-relative values are offset by 8.
Value -= 8;
opc = 2; // 0b0010
}
if (Ctx && ARM_AM::getSOImmVal(Value) == -1)
- Ctx->FatalError(Fixup.getLoc(), "out of range pc-relative fixup value");
+ Ctx->reportFatalError(Fixup.getLoc(), "out of range pc-relative fixup value");
// Encode the immediate and shift the opcode into place.
return ARM_AM::getSOImmVal(Value) | (opc << 21);
}
((uint16_t)imm10LBits) << 1);
return joinHalfWords(FirstHalf, SecondHalf, IsLittleEndian);
}
+ case ARM::fixup_thumb_adr_pcrel_10:
case ARM::fixup_arm_thumb_cp:
- // Offset by 4, and don't encode the low two bits. Two bytes of that
- // 'off by 4' is implicitly handled by the half-word ordering of the
- // Thumb encoding, so we only need to adjust by 2 here.
- return ((Value - 2) >> 2) & 0xff;
+ // On CPUs supporting Thumb2, this will be relaxed to an ldr.w, otherwise we
+ // could have an error on our hands.
+ if (Ctx && !STI->getFeatureBits()[ARM::FeatureThumb2] && IsResolved) {
+ const char *FixupDiagnostic = reasonForFixupRelaxation(Fixup, Value);
+ if (FixupDiagnostic)
+ Ctx->reportFatalError(Fixup.getLoc(), FixupDiagnostic);
+ }
+ // Offset by 4, and don't encode the low two bits.
+ return ((Value - 4) >> 2) & 0xff;
case ARM::fixup_arm_thumb_cb: {
// Offset by 4 and don't encode the lower bit, which is always 0.
+ // FIXME: diagnose if no Thumb2
uint32_t Binary = (Value - 4) >> 1;
return ((Binary & 0x20) << 4) | ((Binary & 0x1f) << 3);
}
case ARM::fixup_arm_thumb_br:
// Offset by 4 and don't encode the lower bit, which is always 0.
+ if (Ctx && !STI->getFeatureBits()[ARM::FeatureThumb2]) {
+ const char *FixupDiagnostic = reasonForFixupRelaxation(Fixup, Value);
+ if (FixupDiagnostic)
+ Ctx->reportFatalError(Fixup.getLoc(), FixupDiagnostic);
+ }
return ((Value - 4) >> 1) & 0x7ff;
case ARM::fixup_arm_thumb_bcc:
// Offset by 4 and don't encode the lower bit, which is always 0.
+ if (Ctx && !STI->getFeatureBits()[ARM::FeatureThumb2]) {
+ const char *FixupDiagnostic = reasonForFixupRelaxation(Fixup, Value);
+ if (FixupDiagnostic)
+ Ctx->reportFatalError(Fixup.getLoc(), FixupDiagnostic);
+ }
return ((Value - 4) >> 1) & 0xff;
case ARM::fixup_arm_pcrel_10_unscaled: {
Value = Value - 8; // ARM fixups offset by an additional word and don't
}
// The value has the low 4 bits encoded in [3:0] and the high 4 in [11:8].
if (Ctx && Value >= 256)
- Ctx->FatalError(Fixup.getLoc(), "out of range pc-relative fixup value");
+ Ctx->reportFatalError(Fixup.getLoc(), "out of range pc-relative fixup value");
Value = (Value & 0xf) | ((Value & 0xf0) << 4);
return Value | (isAdd << 23);
}
// These values don't encode the low two bits since they're always zero.
Value >>= 2;
if (Ctx && Value >= 256)
- Ctx->FatalError(Fixup.getLoc(), "out of range pc-relative fixup value");
+ Ctx->reportFatalError(Fixup.getLoc(), "out of range pc-relative fixup value");
Value |= isAdd << 23;
// Same addressing mode as fixup_arm_pcrel_10, but with 16-bit halfwords
// the offset when the destination has the same MCFragment.
if (A && (unsigned)Fixup.getKind() == ARM::fixup_arm_thumb_bl) {
const MCSymbol &Sym = A->getSymbol();
- const MCSymbolData &SymData = Asm.getSymbolData(Sym);
- IsResolved = (SymData.getFragment() == DF);
+ IsResolved = (Sym.getFragment() == DF);
}
// We must always generate a relocation for BL/BLX instructions if we have
// a symbol to reference, as the linker relies on knowing the destination
// the instruction. This allows adjustFixupValue() to issue a diagnostic
// if the value aren't invalid.
(void)adjustFixupValue(Fixup, Value, false, &Asm.getContext(),
- IsLittleEndian);
+ IsLittleEndian, IsResolved);
}
/// getFixupKindNumBytes - The number of bytes the fixup may change.
unsigned DataSize, uint64_t Value,
bool IsPCRel) const {
unsigned NumBytes = getFixupKindNumBytes(Fixup.getKind());
- Value = adjustFixupValue(Fixup, Value, IsPCRel, nullptr, IsLittleEndian);
+ Value =
+ adjustFixupValue(Fixup, Value, IsPCRel, nullptr, IsLittleEndian, true);
if (!Value)
return; // Doesn't change encoding.
}
}
-MCAsmBackend *llvm::createARMAsmBackend(const Target &T,
- const MCRegisterInfo &MRI, StringRef TT,
- StringRef CPU, bool isLittle) {
- Triple TheTriple(TT);
+static MachO::CPUSubTypeARM getMachOSubTypeFromArch(StringRef Arch) {
+ unsigned AK = ARM::parseArch(Arch);
+ switch (AK) {
+ default:
+ return MachO::CPU_SUBTYPE_ARM_V7;
+ case ARM::AK_ARMV4T:
+ return MachO::CPU_SUBTYPE_ARM_V4T;
+ case ARM::AK_ARMV6:
+ case ARM::AK_ARMV6K:
+ return MachO::CPU_SUBTYPE_ARM_V6;
+ case ARM::AK_ARMV5:
+ return MachO::CPU_SUBTYPE_ARM_V5;
+ case ARM::AK_ARMV5T:
+ case ARM::AK_ARMV5E:
+ case ARM::AK_ARMV5TE:
+ case ARM::AK_ARMV5TEJ:
+ return MachO::CPU_SUBTYPE_ARM_V5TEJ;
+ case ARM::AK_ARMV7:
+ return MachO::CPU_SUBTYPE_ARM_V7;
+ case ARM::AK_ARMV7S:
+ return MachO::CPU_SUBTYPE_ARM_V7S;
+ case ARM::AK_ARMV7K:
+ return MachO::CPU_SUBTYPE_ARM_V7K;
+ case ARM::AK_ARMV6M:
+ case ARM::AK_ARMV6SM:
+ return MachO::CPU_SUBTYPE_ARM_V6M;
+ case ARM::AK_ARMV7M:
+ return MachO::CPU_SUBTYPE_ARM_V7M;
+ case ARM::AK_ARMV7EM:
+ return MachO::CPU_SUBTYPE_ARM_V7EM;
+ }
+}
+MCAsmBackend *llvm::createARMAsmBackend(const Target &T,
+ const MCRegisterInfo &MRI,
+ const Triple &TheTriple, StringRef CPU,
+ bool isLittle) {
switch (TheTriple.getObjectFormat()) {
default:
llvm_unreachable("unsupported object format");
case Triple::MachO: {
- MachO::CPUSubTypeARM CS =
- StringSwitch<MachO::CPUSubTypeARM>(TheTriple.getArchName())
- .Cases("armv4t", "thumbv4t", MachO::CPU_SUBTYPE_ARM_V4T)
- .Cases("armv5e", "thumbv5e", MachO::CPU_SUBTYPE_ARM_V5TEJ)
- .Cases("armv6", "thumbv6", MachO::CPU_SUBTYPE_ARM_V6)
- .Cases("armv6m", "thumbv6m", MachO::CPU_SUBTYPE_ARM_V6M)
- .Cases("armv7em", "thumbv7em", MachO::CPU_SUBTYPE_ARM_V7EM)
- .Cases("armv7k", "thumbv7k", MachO::CPU_SUBTYPE_ARM_V7K)
- .Cases("armv7m", "thumbv7m", MachO::CPU_SUBTYPE_ARM_V7M)
- .Cases("armv7s", "thumbv7s", MachO::CPU_SUBTYPE_ARM_V7S)
- .Default(MachO::CPU_SUBTYPE_ARM_V7);
-
- return new ARMAsmBackendDarwin(T, TT, CS);
+ MachO::CPUSubTypeARM CS = getMachOSubTypeFromArch(TheTriple.getArchName());
+ return new ARMAsmBackendDarwin(T, TheTriple, CS);
}
case Triple::COFF:
assert(TheTriple.isOSWindows() && "non-Windows ARM COFF is not supported");
- return new ARMAsmBackendWinCOFF(T, TT);
+ return new ARMAsmBackendWinCOFF(T, TheTriple);
case Triple::ELF:
assert(TheTriple.isOSBinFormatELF() && "using ELF for non-ELF target");
- uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(Triple(TT).getOS());
- return new ARMAsmBackendELF(T, TT, OSABI, isLittle);
+ uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(TheTriple.getOS());
+ return new ARMAsmBackendELF(T, TheTriple, OSABI, isLittle);
}
}
MCAsmBackend *llvm::createARMLEAsmBackend(const Target &T,
const MCRegisterInfo &MRI,
- StringRef TT, StringRef CPU) {
+ const Triple &TT, StringRef CPU) {
return createARMAsmBackend(T, MRI, TT, CPU, true);
}
MCAsmBackend *llvm::createARMBEAsmBackend(const Target &T,
const MCRegisterInfo &MRI,
- StringRef TT, StringRef CPU) {
+ const Triple &TT, StringRef CPU) {
return createARMAsmBackend(T, MRI, TT, CPU, false);
}
MCAsmBackend *llvm::createThumbLEAsmBackend(const Target &T,
const MCRegisterInfo &MRI,
- StringRef TT, StringRef CPU) {
+ const Triple &TT, StringRef CPU) {
return createARMAsmBackend(T, MRI, TT, CPU, true);
}
MCAsmBackend *llvm::createThumbBEAsmBackend(const Target &T,
const MCRegisterInfo &MRI,
- StringRef TT, StringRef CPU) {
+ const Triple &TT, StringRef CPU) {
return createARMAsmBackend(T, MRI, TT, CPU, false);
}
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