| //===-- MipsAsmBackend.cpp - Mips Asm Backend ----------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements the MipsAsmBackend class. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| |
| #include "MCTargetDesc/MipsAsmBackend.h" |
| #include "MCTargetDesc/MipsABIInfo.h" |
| #include "MCTargetDesc/MipsFixupKinds.h" |
| #include "MCTargetDesc/MipsMCExpr.h" |
| #include "MCTargetDesc/MipsMCTargetDesc.h" |
| #include "llvm/ADT/STLExtras.h" |
| #include "llvm/MC/MCAsmBackend.h" |
| #include "llvm/MC/MCAssembler.h" |
| #include "llvm/MC/MCContext.h" |
| #include "llvm/MC/MCDirectives.h" |
| #include "llvm/MC/MCELFObjectWriter.h" |
| #include "llvm/MC/MCFixupKindInfo.h" |
| #include "llvm/MC/MCObjectWriter.h" |
| #include "llvm/MC/MCSubtargetInfo.h" |
| #include "llvm/MC/MCTargetOptions.h" |
| #include "llvm/MC/MCValue.h" |
| #include "llvm/Support/ErrorHandling.h" |
| #include "llvm/Support/Format.h" |
| #include "llvm/Support/MathExtras.h" |
| #include "llvm/Support/raw_ostream.h" |
| |
| using namespace llvm; |
| |
| // Prepare value for the target space for it |
| static unsigned adjustFixupValue(const MCFixup &Fixup, uint64_t Value, |
| MCContext &Ctx) { |
| |
| unsigned Kind = Fixup.getKind(); |
| |
| // Add/subtract and shift |
| switch (Kind) { |
| default: |
| return 0; |
| case FK_Data_2: |
| case Mips::fixup_Mips_LO16: |
| case Mips::fixup_Mips_GPREL16: |
| case Mips::fixup_Mips_GPOFF_HI: |
| case Mips::fixup_Mips_GPOFF_LO: |
| case Mips::fixup_Mips_GOT_PAGE: |
| case Mips::fixup_Mips_GOT_OFST: |
| case Mips::fixup_Mips_GOT_DISP: |
| case Mips::fixup_Mips_GOT_LO16: |
| case Mips::fixup_Mips_CALL_LO16: |
| case Mips::fixup_MICROMIPS_GPOFF_HI: |
| case Mips::fixup_MICROMIPS_GPOFF_LO: |
| case Mips::fixup_MICROMIPS_LO16: |
| case Mips::fixup_MICROMIPS_GOT_PAGE: |
| case Mips::fixup_MICROMIPS_GOT_OFST: |
| case Mips::fixup_MICROMIPS_GOT_DISP: |
| case Mips::fixup_MIPS_PCLO16: |
| Value &= 0xffff; |
| break; |
| case FK_DTPRel_4: |
| case FK_DTPRel_8: |
| case FK_TPRel_4: |
| case FK_TPRel_8: |
| case FK_GPRel_4: |
| case FK_Data_4: |
| case FK_Data_8: |
| case Mips::fixup_Mips_SUB: |
| case Mips::fixup_MICROMIPS_SUB: |
| break; |
| case Mips::fixup_Mips_PC16: |
| // The displacement is then divided by 4 to give us an 18 bit |
| // address range. Forcing a signed division because Value can be negative. |
| Value = (int64_t)Value / 4; |
| // We now check if Value can be encoded as a 16-bit signed immediate. |
| if (!isInt<16>(Value)) { |
| Ctx.reportError(Fixup.getLoc(), "out of range PC16 fixup"); |
| return 0; |
| } |
| break; |
| case Mips::fixup_MIPS_PC19_S2: |
| case Mips::fixup_MICROMIPS_PC19_S2: |
| // Forcing a signed division because Value can be negative. |
| Value = (int64_t)Value / 4; |
| // We now check if Value can be encoded as a 19-bit signed immediate. |
| if (!isInt<19>(Value)) { |
| Ctx.reportError(Fixup.getLoc(), "out of range PC19 fixup"); |
| return 0; |
| } |
| break; |
| case Mips::fixup_Mips_26: |
| // So far we are only using this type for jumps. |
| // The displacement is then divided by 4 to give us an 28 bit |
| // address range. |
| Value >>= 2; |
| break; |
| case Mips::fixup_Mips_HI16: |
| case Mips::fixup_Mips_GOT: |
| case Mips::fixup_MICROMIPS_GOT16: |
| case Mips::fixup_Mips_GOT_HI16: |
| case Mips::fixup_Mips_CALL_HI16: |
| case Mips::fixup_MICROMIPS_HI16: |
| case Mips::fixup_MIPS_PCHI16: |
| // Get the 2nd 16-bits. Also add 1 if bit 15 is 1. |
| Value = ((Value + 0x8000) >> 16) & 0xffff; |
| break; |
| case Mips::fixup_Mips_HIGHER: |
| case Mips::fixup_MICROMIPS_HIGHER: |
| // Get the 3rd 16-bits. |
| Value = ((Value + 0x80008000LL) >> 32) & 0xffff; |
| break; |
| case Mips::fixup_Mips_HIGHEST: |
| case Mips::fixup_MICROMIPS_HIGHEST: |
| // Get the 4th 16-bits. |
| Value = ((Value + 0x800080008000LL) >> 48) & 0xffff; |
| break; |
| case Mips::fixup_MICROMIPS_26_S1: |
| Value >>= 1; |
| break; |
| case Mips::fixup_MICROMIPS_PC7_S1: |
| Value -= 4; |
| // Forcing a signed division because Value can be negative. |
| Value = (int64_t) Value / 2; |
| // We now check if Value can be encoded as a 7-bit signed immediate. |
| if (!isInt<7>(Value)) { |
| Ctx.reportError(Fixup.getLoc(), "out of range PC7 fixup"); |
| return 0; |
| } |
| break; |
| case Mips::fixup_MICROMIPS_PC10_S1: |
| Value -= 2; |
| // Forcing a signed division because Value can be negative. |
| Value = (int64_t) Value / 2; |
| // We now check if Value can be encoded as a 10-bit signed immediate. |
| if (!isInt<10>(Value)) { |
| Ctx.reportError(Fixup.getLoc(), "out of range PC10 fixup"); |
| return 0; |
| } |
| break; |
| case Mips::fixup_MICROMIPS_PC16_S1: |
| Value -= 4; |
| // Forcing a signed division because Value can be negative. |
| Value = (int64_t)Value / 2; |
| // We now check if Value can be encoded as a 16-bit signed immediate. |
| if (!isInt<16>(Value)) { |
| Ctx.reportError(Fixup.getLoc(), "out of range PC16 fixup"); |
| return 0; |
| } |
| break; |
| case Mips::fixup_MIPS_PC18_S3: |
| // Forcing a signed division because Value can be negative. |
| Value = (int64_t)Value / 8; |
| // We now check if Value can be encoded as a 18-bit signed immediate. |
| if (!isInt<18>(Value)) { |
| Ctx.reportError(Fixup.getLoc(), "out of range PC18 fixup"); |
| return 0; |
| } |
| break; |
| case Mips::fixup_MICROMIPS_PC18_S3: |
| // Check alignment. |
| if ((Value & 7)) { |
| Ctx.reportError(Fixup.getLoc(), "out of range PC18 fixup"); |
| } |
| // Forcing a signed division because Value can be negative. |
| Value = (int64_t)Value / 8; |
| // We now check if Value can be encoded as a 18-bit signed immediate. |
| if (!isInt<18>(Value)) { |
| Ctx.reportError(Fixup.getLoc(), "out of range PC18 fixup"); |
| return 0; |
| } |
| break; |
| case Mips::fixup_MIPS_PC21_S2: |
| // Forcing a signed division because Value can be negative. |
| Value = (int64_t) Value / 4; |
| // We now check if Value can be encoded as a 21-bit signed immediate. |
| if (!isInt<21>(Value)) { |
| Ctx.reportError(Fixup.getLoc(), "out of range PC21 fixup"); |
| return 0; |
| } |
| break; |
| case Mips::fixup_MIPS_PC26_S2: |
| // Forcing a signed division because Value can be negative. |
| Value = (int64_t) Value / 4; |
| // We now check if Value can be encoded as a 26-bit signed immediate. |
| if (!isInt<26>(Value)) { |
| Ctx.reportError(Fixup.getLoc(), "out of range PC26 fixup"); |
| return 0; |
| } |
| break; |
| case Mips::fixup_MICROMIPS_PC26_S1: |
| // Forcing a signed division because Value can be negative. |
| Value = (int64_t)Value / 2; |
| // We now check if Value can be encoded as a 26-bit signed immediate. |
| if (!isInt<26>(Value)) { |
| Ctx.reportFatalError(Fixup.getLoc(), "out of range PC26 fixup"); |
| return 0; |
| } |
| break; |
| case Mips::fixup_MICROMIPS_PC21_S1: |
| // Forcing a signed division because Value can be negative. |
| Value = (int64_t)Value / 2; |
| // We now check if Value can be encoded as a 21-bit signed immediate. |
| if (!isInt<21>(Value)) { |
| Ctx.reportError(Fixup.getLoc(), "out of range PC21 fixup"); |
| return 0; |
| } |
| break; |
| } |
| |
| return Value; |
| } |
| |
| std::unique_ptr<MCObjectTargetWriter> |
| MipsAsmBackend::createObjectTargetWriter() const { |
| return createMipsELFObjectWriter(TheTriple, IsN32); |
| } |
| |
| // Little-endian fixup data byte ordering: |
| // mips32r2: a | b | x | x |
| // microMIPS: x | x | a | b |
| |
| static bool needsMMLEByteOrder(unsigned Kind) { |
| return Kind != Mips::fixup_MICROMIPS_PC10_S1 && |
| Kind >= Mips::fixup_MICROMIPS_26_S1 && |
| Kind < Mips::LastTargetFixupKind; |
| } |
| |
| // Calculate index for microMIPS specific little endian byte order |
| static unsigned calculateMMLEIndex(unsigned i) { |
| assert(i <= 3 && "Index out of range!"); |
| |
| return (1 - i / 2) * 2 + i % 2; |
| } |
| |
| /// ApplyFixup - Apply the \p Value for given \p Fixup into the provided |
| /// data fragment, at the offset specified by the fixup and following the |
| /// fixup kind as appropriate. |
| void MipsAsmBackend::applyFixup(const MCAssembler &Asm, const MCFixup &Fixup, |
| const MCValue &Target, |
| MutableArrayRef<char> Data, uint64_t Value, |
| bool IsResolved, |
| const MCSubtargetInfo *STI) const { |
| MCFixupKind Kind = Fixup.getKind(); |
| MCContext &Ctx = Asm.getContext(); |
| Value = adjustFixupValue(Fixup, Value, Ctx); |
| |
| if (!Value) |
| return; // Doesn't change encoding. |
| |
| // Where do we start in the object |
| unsigned Offset = Fixup.getOffset(); |
| // Number of bytes we need to fixup |
| unsigned NumBytes = (getFixupKindInfo(Kind).TargetSize + 7) / 8; |
| // Used to point to big endian bytes |
| unsigned FullSize; |
| |
| switch ((unsigned)Kind) { |
| case FK_Data_2: |
| case Mips::fixup_Mips_16: |
| case Mips::fixup_MICROMIPS_PC10_S1: |
| FullSize = 2; |
| break; |
| case FK_Data_8: |
| case Mips::fixup_Mips_64: |
| FullSize = 8; |
| break; |
| case FK_Data_4: |
| default: |
| FullSize = 4; |
| break; |
| } |
| |
| // Grab current value, if any, from bits. |
| uint64_t CurVal = 0; |
| |
| bool microMipsLEByteOrder = needsMMLEByteOrder((unsigned) Kind); |
| |
| for (unsigned i = 0; i != NumBytes; ++i) { |
| unsigned Idx = Endian == support::little |
| ? (microMipsLEByteOrder ? calculateMMLEIndex(i) : i) |
| : (FullSize - 1 - i); |
| CurVal |= (uint64_t)((uint8_t)Data[Offset + Idx]) << (i*8); |
| } |
| |
| uint64_t Mask = ((uint64_t)(-1) >> |
| (64 - getFixupKindInfo(Kind).TargetSize)); |
| CurVal |= Value & Mask; |
| |
| // Write out the fixed up bytes back to the code/data bits. |
| for (unsigned i = 0; i != NumBytes; ++i) { |
| unsigned Idx = Endian == support::little |
| ? (microMipsLEByteOrder ? calculateMMLEIndex(i) : i) |
| : (FullSize - 1 - i); |
| Data[Offset + Idx] = (uint8_t)((CurVal >> (i*8)) & 0xff); |
| } |
| } |
| |
| Optional<MCFixupKind> MipsAsmBackend::getFixupKind(StringRef Name) const { |
| return StringSwitch<Optional<MCFixupKind>>(Name) |
| .Case("R_MIPS_NONE", FK_NONE) |
| .Case("R_MIPS_32", FK_Data_4) |
| .Case("R_MIPS_CALL_HI16", (MCFixupKind)Mips::fixup_Mips_CALL_HI16) |
| .Case("R_MIPS_CALL_LO16", (MCFixupKind)Mips::fixup_Mips_CALL_LO16) |
| .Case("R_MIPS_CALL16", (MCFixupKind)Mips::fixup_Mips_CALL16) |
| .Case("R_MIPS_GOT16", (MCFixupKind)Mips::fixup_Mips_GOT) |
| .Case("R_MIPS_GOT_PAGE", (MCFixupKind)Mips::fixup_Mips_GOT_PAGE) |
| .Case("R_MIPS_GOT_OFST", (MCFixupKind)Mips::fixup_Mips_GOT_OFST) |
| .Case("R_MIPS_GOT_DISP", (MCFixupKind)Mips::fixup_Mips_GOT_DISP) |
| .Case("R_MIPS_GOT_HI16", (MCFixupKind)Mips::fixup_Mips_GOT_HI16) |
| .Case("R_MIPS_GOT_LO16", (MCFixupKind)Mips::fixup_Mips_GOT_LO16) |
| .Case("R_MIPS_TLS_GOTTPREL", (MCFixupKind)Mips::fixup_Mips_GOTTPREL) |
| .Case("R_MIPS_TLS_DTPREL_HI16", (MCFixupKind)Mips::fixup_Mips_DTPREL_HI) |
| .Case("R_MIPS_TLS_DTPREL_LO16", (MCFixupKind)Mips::fixup_Mips_DTPREL_LO) |
| .Case("R_MIPS_TLS_GD", (MCFixupKind)Mips::fixup_Mips_TLSGD) |
| .Case("R_MIPS_TLS_LDM", (MCFixupKind)Mips::fixup_Mips_TLSLDM) |
| .Case("R_MIPS_TLS_TPREL_HI16", (MCFixupKind)Mips::fixup_Mips_TPREL_HI) |
| .Case("R_MIPS_TLS_TPREL_LO16", (MCFixupKind)Mips::fixup_Mips_TPREL_LO) |
| .Case("R_MICROMIPS_CALL16", (MCFixupKind)Mips::fixup_MICROMIPS_CALL16) |
| .Case("R_MICROMIPS_GOT_DISP", (MCFixupKind)Mips::fixup_MICROMIPS_GOT_DISP) |
| .Case("R_MICROMIPS_GOT_PAGE", (MCFixupKind)Mips::fixup_MICROMIPS_GOT_PAGE) |
| .Case("R_MICROMIPS_GOT_OFST", (MCFixupKind)Mips::fixup_MICROMIPS_GOT_OFST) |
| .Case("R_MICROMIPS_GOT16", (MCFixupKind)Mips::fixup_MICROMIPS_GOT16) |
| .Case("R_MICROMIPS_TLS_GOTTPREL", |
| (MCFixupKind)Mips::fixup_MICROMIPS_GOTTPREL) |
| .Case("R_MICROMIPS_TLS_DTPREL_HI16", |
| (MCFixupKind)Mips::fixup_MICROMIPS_TLS_DTPREL_HI16) |
| .Case("R_MICROMIPS_TLS_DTPREL_LO16", |
| (MCFixupKind)Mips::fixup_MICROMIPS_TLS_DTPREL_LO16) |
| .Case("R_MICROMIPS_TLS_GD", (MCFixupKind)Mips::fixup_MICROMIPS_TLS_GD) |
| .Case("R_MICROMIPS_TLS_LDM", (MCFixupKind)Mips::fixup_MICROMIPS_TLS_LDM) |
| .Case("R_MICROMIPS_TLS_TPREL_HI16", |
| (MCFixupKind)Mips::fixup_MICROMIPS_TLS_TPREL_HI16) |
| .Case("R_MICROMIPS_TLS_TPREL_LO16", |
| (MCFixupKind)Mips::fixup_MICROMIPS_TLS_TPREL_LO16) |
| .Case("R_MIPS_JALR", (MCFixupKind)Mips::fixup_Mips_JALR) |
| .Case("R_MICROMIPS_JALR", (MCFixupKind)Mips::fixup_MICROMIPS_JALR) |
| .Default(MCAsmBackend::getFixupKind(Name)); |
| } |
| |
| const MCFixupKindInfo &MipsAsmBackend:: |
| getFixupKindInfo(MCFixupKind Kind) const { |
| const static MCFixupKindInfo LittleEndianInfos[] = { |
| // This table *must* be in same the order of fixup_* kinds in |
| // MipsFixupKinds.h. |
| // |
| // name offset bits flags |
| { "fixup_Mips_16", 0, 16, 0 }, |
| { "fixup_Mips_32", 0, 32, 0 }, |
| { "fixup_Mips_REL32", 0, 32, 0 }, |
| { "fixup_Mips_26", 0, 26, 0 }, |
| { "fixup_Mips_HI16", 0, 16, 0 }, |
| { "fixup_Mips_LO16", 0, 16, 0 }, |
| { "fixup_Mips_GPREL16", 0, 16, 0 }, |
| { "fixup_Mips_LITERAL", 0, 16, 0 }, |
| { "fixup_Mips_GOT", 0, 16, 0 }, |
| { "fixup_Mips_PC16", 0, 16, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_Mips_CALL16", 0, 16, 0 }, |
| { "fixup_Mips_GPREL32", 0, 32, 0 }, |
| { "fixup_Mips_SHIFT5", 6, 5, 0 }, |
| { "fixup_Mips_SHIFT6", 6, 5, 0 }, |
| { "fixup_Mips_64", 0, 64, 0 }, |
| { "fixup_Mips_TLSGD", 0, 16, 0 }, |
| { "fixup_Mips_GOTTPREL", 0, 16, 0 }, |
| { "fixup_Mips_TPREL_HI", 0, 16, 0 }, |
| { "fixup_Mips_TPREL_LO", 0, 16, 0 }, |
| { "fixup_Mips_TLSLDM", 0, 16, 0 }, |
| { "fixup_Mips_DTPREL_HI", 0, 16, 0 }, |
| { "fixup_Mips_DTPREL_LO", 0, 16, 0 }, |
| { "fixup_Mips_Branch_PCRel", 0, 16, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_Mips_GPOFF_HI", 0, 16, 0 }, |
| { "fixup_MICROMIPS_GPOFF_HI",0, 16, 0 }, |
| { "fixup_Mips_GPOFF_LO", 0, 16, 0 }, |
| { "fixup_MICROMIPS_GPOFF_LO",0, 16, 0 }, |
| { "fixup_Mips_GOT_PAGE", 0, 16, 0 }, |
| { "fixup_Mips_GOT_OFST", 0, 16, 0 }, |
| { "fixup_Mips_GOT_DISP", 0, 16, 0 }, |
| { "fixup_Mips_HIGHER", 0, 16, 0 }, |
| { "fixup_MICROMIPS_HIGHER", 0, 16, 0 }, |
| { "fixup_Mips_HIGHEST", 0, 16, 0 }, |
| { "fixup_MICROMIPS_HIGHEST", 0, 16, 0 }, |
| { "fixup_Mips_GOT_HI16", 0, 16, 0 }, |
| { "fixup_Mips_GOT_LO16", 0, 16, 0 }, |
| { "fixup_Mips_CALL_HI16", 0, 16, 0 }, |
| { "fixup_Mips_CALL_LO16", 0, 16, 0 }, |
| { "fixup_Mips_PC18_S3", 0, 18, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MIPS_PC19_S2", 0, 19, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MIPS_PC21_S2", 0, 21, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MIPS_PC26_S2", 0, 26, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MIPS_PCHI16", 0, 16, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MIPS_PCLO16", 0, 16, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MICROMIPS_26_S1", 0, 26, 0 }, |
| { "fixup_MICROMIPS_HI16", 0, 16, 0 }, |
| { "fixup_MICROMIPS_LO16", 0, 16, 0 }, |
| { "fixup_MICROMIPS_GOT16", 0, 16, 0 }, |
| { "fixup_MICROMIPS_PC7_S1", 0, 7, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MICROMIPS_PC10_S1", 0, 10, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MICROMIPS_PC16_S1", 0, 16, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MICROMIPS_PC26_S1", 0, 26, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MICROMIPS_PC19_S2", 0, 19, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MICROMIPS_PC18_S3", 0, 18, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MICROMIPS_PC21_S1", 0, 21, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MICROMIPS_CALL16", 0, 16, 0 }, |
| { "fixup_MICROMIPS_GOT_DISP", 0, 16, 0 }, |
| { "fixup_MICROMIPS_GOT_PAGE", 0, 16, 0 }, |
| { "fixup_MICROMIPS_GOT_OFST", 0, 16, 0 }, |
| { "fixup_MICROMIPS_TLS_GD", 0, 16, 0 }, |
| { "fixup_MICROMIPS_TLS_LDM", 0, 16, 0 }, |
| { "fixup_MICROMIPS_TLS_DTPREL_HI16", 0, 16, 0 }, |
| { "fixup_MICROMIPS_TLS_DTPREL_LO16", 0, 16, 0 }, |
| { "fixup_MICROMIPS_GOTTPREL", 0, 16, 0 }, |
| { "fixup_MICROMIPS_TLS_TPREL_HI16", 0, 16, 0 }, |
| { "fixup_MICROMIPS_TLS_TPREL_LO16", 0, 16, 0 }, |
| { "fixup_Mips_SUB", 0, 64, 0 }, |
| { "fixup_MICROMIPS_SUB", 0, 64, 0 }, |
| { "fixup_Mips_JALR", 0, 32, 0 }, |
| { "fixup_MICROMIPS_JALR", 0, 32, 0 } |
| }; |
| static_assert(array_lengthof(LittleEndianInfos) == Mips::NumTargetFixupKinds, |
| "Not all MIPS little endian fixup kinds added!"); |
| |
| const static MCFixupKindInfo BigEndianInfos[] = { |
| // This table *must* be in same the order of fixup_* kinds in |
| // MipsFixupKinds.h. |
| // |
| // name offset bits flags |
| { "fixup_Mips_16", 16, 16, 0 }, |
| { "fixup_Mips_32", 0, 32, 0 }, |
| { "fixup_Mips_REL32", 0, 32, 0 }, |
| { "fixup_Mips_26", 6, 26, 0 }, |
| { "fixup_Mips_HI16", 16, 16, 0 }, |
| { "fixup_Mips_LO16", 16, 16, 0 }, |
| { "fixup_Mips_GPREL16", 16, 16, 0 }, |
| { "fixup_Mips_LITERAL", 16, 16, 0 }, |
| { "fixup_Mips_GOT", 16, 16, 0 }, |
| { "fixup_Mips_PC16", 16, 16, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_Mips_CALL16", 16, 16, 0 }, |
| { "fixup_Mips_GPREL32", 0, 32, 0 }, |
| { "fixup_Mips_SHIFT5", 21, 5, 0 }, |
| { "fixup_Mips_SHIFT6", 21, 5, 0 }, |
| { "fixup_Mips_64", 0, 64, 0 }, |
| { "fixup_Mips_TLSGD", 16, 16, 0 }, |
| { "fixup_Mips_GOTTPREL", 16, 16, 0 }, |
| { "fixup_Mips_TPREL_HI", 16, 16, 0 }, |
| { "fixup_Mips_TPREL_LO", 16, 16, 0 }, |
| { "fixup_Mips_TLSLDM", 16, 16, 0 }, |
| { "fixup_Mips_DTPREL_HI", 16, 16, 0 }, |
| { "fixup_Mips_DTPREL_LO", 16, 16, 0 }, |
| { "fixup_Mips_Branch_PCRel",16, 16, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_Mips_GPOFF_HI", 16, 16, 0 }, |
| { "fixup_MICROMIPS_GPOFF_HI", 16, 16, 0 }, |
| { "fixup_Mips_GPOFF_LO", 16, 16, 0 }, |
| { "fixup_MICROMIPS_GPOFF_LO", 16, 16, 0 }, |
| { "fixup_Mips_GOT_PAGE", 16, 16, 0 }, |
| { "fixup_Mips_GOT_OFST", 16, 16, 0 }, |
| { "fixup_Mips_GOT_DISP", 16, 16, 0 }, |
| { "fixup_Mips_HIGHER", 16, 16, 0 }, |
| { "fixup_MICROMIPS_HIGHER", 16, 16, 0 }, |
| { "fixup_Mips_HIGHEST", 16, 16, 0 }, |
| { "fixup_MICROMIPS_HIGHEST",16, 16, 0 }, |
| { "fixup_Mips_GOT_HI16", 16, 16, 0 }, |
| { "fixup_Mips_GOT_LO16", 16, 16, 0 }, |
| { "fixup_Mips_CALL_HI16", 16, 16, 0 }, |
| { "fixup_Mips_CALL_LO16", 16, 16, 0 }, |
| { "fixup_Mips_PC18_S3", 14, 18, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MIPS_PC19_S2", 13, 19, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MIPS_PC21_S2", 11, 21, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MIPS_PC26_S2", 6, 26, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MIPS_PCHI16", 16, 16, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MIPS_PCLO16", 16, 16, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MICROMIPS_26_S1", 6, 26, 0 }, |
| { "fixup_MICROMIPS_HI16", 16, 16, 0 }, |
| { "fixup_MICROMIPS_LO16", 16, 16, 0 }, |
| { "fixup_MICROMIPS_GOT16", 16, 16, 0 }, |
| { "fixup_MICROMIPS_PC7_S1", 9, 7, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MICROMIPS_PC10_S1", 6, 10, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MICROMIPS_PC16_S1",16, 16, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MICROMIPS_PC26_S1", 6, 26, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MICROMIPS_PC19_S2",13, 19, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MICROMIPS_PC18_S3",14, 18, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MICROMIPS_PC21_S1",11, 21, MCFixupKindInfo::FKF_IsPCRel }, |
| { "fixup_MICROMIPS_CALL16", 16, 16, 0 }, |
| { "fixup_MICROMIPS_GOT_DISP", 16, 16, 0 }, |
| { "fixup_MICROMIPS_GOT_PAGE", 16, 16, 0 }, |
| { "fixup_MICROMIPS_GOT_OFST", 16, 16, 0 }, |
| { "fixup_MICROMIPS_TLS_GD", 16, 16, 0 }, |
| { "fixup_MICROMIPS_TLS_LDM", 16, 16, 0 }, |
| { "fixup_MICROMIPS_TLS_DTPREL_HI16", 16, 16, 0 }, |
| { "fixup_MICROMIPS_TLS_DTPREL_LO16", 16, 16, 0 }, |
| { "fixup_MICROMIPS_GOTTPREL", 16, 16, 0 }, |
| { "fixup_MICROMIPS_TLS_TPREL_HI16", 16, 16, 0 }, |
| { "fixup_MICROMIPS_TLS_TPREL_LO16", 16, 16, 0 }, |
| { "fixup_Mips_SUB", 0, 64, 0 }, |
| { "fixup_MICROMIPS_SUB", 0, 64, 0 }, |
| { "fixup_Mips_JALR", 0, 32, 0 }, |
| { "fixup_MICROMIPS_JALR", 0, 32, 0 } |
| }; |
| static_assert(array_lengthof(BigEndianInfos) == Mips::NumTargetFixupKinds, |
| "Not all MIPS big endian fixup kinds added!"); |
| |
| if (Kind < FirstTargetFixupKind) |
| return MCAsmBackend::getFixupKindInfo(Kind); |
| |
| assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() && |
| "Invalid kind!"); |
| |
| if (Endian == support::little) |
| return LittleEndianInfos[Kind - FirstTargetFixupKind]; |
| return BigEndianInfos[Kind - FirstTargetFixupKind]; |
| } |
| |
| /// WriteNopData - Write an (optimal) nop sequence of Count bytes |
| /// to the given output. If the target cannot generate such a sequence, |
| /// it should return an error. |
| /// |
| /// \return - True on success. |
| bool MipsAsmBackend::writeNopData(raw_ostream &OS, uint64_t Count) const { |
| // Check for a less than instruction size number of bytes |
| // FIXME: 16 bit instructions are not handled yet here. |
| // We shouldn't be using a hard coded number for instruction size. |
| |
| // If the count is not 4-byte aligned, we must be writing data into the text |
| // section (otherwise we have unaligned instructions, and thus have far |
| // bigger problems), so just write zeros instead. |
| OS.write_zeros(Count); |
| return true; |
| } |
| |
| bool MipsAsmBackend::shouldForceRelocation(const MCAssembler &Asm, |
| const MCFixup &Fixup, |
| const MCValue &Target) { |
| const unsigned FixupKind = Fixup.getKind(); |
| switch (FixupKind) { |
| default: |
| return false; |
| // All these relocations require special processing |
| // at linking time. Delegate this work to a linker. |
| case Mips::fixup_Mips_CALL_HI16: |
| case Mips::fixup_Mips_CALL_LO16: |
| case Mips::fixup_Mips_CALL16: |
| case Mips::fixup_Mips_GOT: |
| case Mips::fixup_Mips_GOT_PAGE: |
| case Mips::fixup_Mips_GOT_OFST: |
| case Mips::fixup_Mips_GOT_DISP: |
| case Mips::fixup_Mips_GOT_HI16: |
| case Mips::fixup_Mips_GOT_LO16: |
| case Mips::fixup_Mips_GOTTPREL: |
| case Mips::fixup_Mips_DTPREL_HI: |
| case Mips::fixup_Mips_DTPREL_LO: |
| case Mips::fixup_Mips_TLSGD: |
| case Mips::fixup_Mips_TLSLDM: |
| case Mips::fixup_Mips_TPREL_HI: |
| case Mips::fixup_Mips_TPREL_LO: |
| case Mips::fixup_Mips_JALR: |
| case Mips::fixup_MICROMIPS_CALL16: |
| case Mips::fixup_MICROMIPS_GOT_DISP: |
| case Mips::fixup_MICROMIPS_GOT_PAGE: |
| case Mips::fixup_MICROMIPS_GOT_OFST: |
| case Mips::fixup_MICROMIPS_GOT16: |
| case Mips::fixup_MICROMIPS_GOTTPREL: |
| case Mips::fixup_MICROMIPS_TLS_DTPREL_HI16: |
| case Mips::fixup_MICROMIPS_TLS_DTPREL_LO16: |
| case Mips::fixup_MICROMIPS_TLS_GD: |
| case Mips::fixup_MICROMIPS_TLS_LDM: |
| case Mips::fixup_MICROMIPS_TLS_TPREL_HI16: |
| case Mips::fixup_MICROMIPS_TLS_TPREL_LO16: |
| case Mips::fixup_MICROMIPS_JALR: |
| return true; |
| } |
| } |
| |
| bool MipsAsmBackend::isMicroMips(const MCSymbol *Sym) const { |
| if (const auto *ElfSym = dyn_cast<const MCSymbolELF>(Sym)) { |
| if (ElfSym->getOther() & ELF::STO_MIPS_MICROMIPS) |
| return true; |
| } |
| return false; |
| } |
| |
| MCAsmBackend *llvm::createMipsAsmBackend(const Target &T, |
| const MCSubtargetInfo &STI, |
| const MCRegisterInfo &MRI, |
| const MCTargetOptions &Options) { |
| MipsABIInfo ABI = MipsABIInfo::computeTargetABI(STI.getTargetTriple(), STI.getCPU(), Options); |
| return new MipsAsmBackend(T, MRI, STI.getTargetTriple(), STI.getCPU(), ABI.IsN32()); |
| } |