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llvm-for-llvmta/lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp

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2022-04-25 10:02:23 +02:00
//===-- MipsMCCodeEmitter.cpp - Convert Mips Code to Machine Code ---------===//
//
// 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 MipsMCCodeEmitter class.
//
//===----------------------------------------------------------------------===//
#include "MipsMCCodeEmitter.h"
#include "MCTargetDesc/MipsFixupKinds.h"
#include "MCTargetDesc/MipsMCExpr.h"
#include "MCTargetDesc/MipsMCTargetDesc.h"
#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCFixup.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstrDesc.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
#include <cstdint>
using namespace llvm;
#define DEBUG_TYPE "mccodeemitter"
#define GET_INSTRMAP_INFO
#include "MipsGenInstrInfo.inc"
#undef GET_INSTRMAP_INFO
namespace llvm {
MCCodeEmitter *createMipsMCCodeEmitterEB(const MCInstrInfo &MCII,
const MCRegisterInfo &MRI,
MCContext &Ctx) {
return new MipsMCCodeEmitter(MCII, Ctx, false);
}
MCCodeEmitter *createMipsMCCodeEmitterEL(const MCInstrInfo &MCII,
const MCRegisterInfo &MRI,
MCContext &Ctx) {
return new MipsMCCodeEmitter(MCII, Ctx, true);
}
} // end namespace llvm
// If the D<shift> instruction has a shift amount that is greater
// than 31 (checked in calling routine), lower it to a D<shift>32 instruction
static void LowerLargeShift(MCInst& Inst) {
assert(Inst.getNumOperands() == 3 && "Invalid no. of operands for shift!");
assert(Inst.getOperand(2).isImm());
int64_t Shift = Inst.getOperand(2).getImm();
if (Shift <= 31)
return; // Do nothing
Shift -= 32;
// saminus32
Inst.getOperand(2).setImm(Shift);
switch (Inst.getOpcode()) {
default:
// Calling function is not synchronized
llvm_unreachable("Unexpected shift instruction");
case Mips::DSLL:
Inst.setOpcode(Mips::DSLL32);
return;
case Mips::DSRL:
Inst.setOpcode(Mips::DSRL32);
return;
case Mips::DSRA:
Inst.setOpcode(Mips::DSRA32);
return;
case Mips::DROTR:
Inst.setOpcode(Mips::DROTR32);
return;
}
}
// Fix a bad compact branch encoding for beqc/bnec.
void MipsMCCodeEmitter::LowerCompactBranch(MCInst& Inst) const {
// Encoding may be illegal !(rs < rt), but this situation is
// easily fixed.
unsigned RegOp0 = Inst.getOperand(0).getReg();
unsigned RegOp1 = Inst.getOperand(1).getReg();
unsigned Reg0 = Ctx.getRegisterInfo()->getEncodingValue(RegOp0);
unsigned Reg1 = Ctx.getRegisterInfo()->getEncodingValue(RegOp1);
if (Inst.getOpcode() == Mips::BNEC || Inst.getOpcode() == Mips::BEQC ||
Inst.getOpcode() == Mips::BNEC64 || Inst.getOpcode() == Mips::BEQC64) {
assert(Reg0 != Reg1 && "Instruction has bad operands ($rs == $rt)!");
if (Reg0 < Reg1)
return;
} else if (Inst.getOpcode() == Mips::BNVC || Inst.getOpcode() == Mips::BOVC) {
if (Reg0 >= Reg1)
return;
} else if (Inst.getOpcode() == Mips::BNVC_MMR6 ||
Inst.getOpcode() == Mips::BOVC_MMR6) {
if (Reg1 >= Reg0)
return;
} else
llvm_unreachable("Cannot rewrite unknown branch!");
Inst.getOperand(0).setReg(RegOp1);
Inst.getOperand(1).setReg(RegOp0);
}
bool MipsMCCodeEmitter::isMicroMips(const MCSubtargetInfo &STI) const {
return STI.getFeatureBits()[Mips::FeatureMicroMips];
}
bool MipsMCCodeEmitter::isMips32r6(const MCSubtargetInfo &STI) const {
return STI.getFeatureBits()[Mips::FeatureMips32r6];
}
void MipsMCCodeEmitter::EmitByte(unsigned char C, raw_ostream &OS) const {
OS << (char)C;
}
void MipsMCCodeEmitter::emitInstruction(uint64_t Val, unsigned Size,
const MCSubtargetInfo &STI,
raw_ostream &OS) const {
// Output the instruction encoding in little endian byte order.
// Little-endian byte ordering:
// mips32r2: 4 | 3 | 2 | 1
// microMIPS: 2 | 1 | 4 | 3
if (IsLittleEndian && Size == 4 && isMicroMips(STI)) {
emitInstruction(Val >> 16, 2, STI, OS);
emitInstruction(Val, 2, STI, OS);
} else {
for (unsigned i = 0; i < Size; ++i) {
unsigned Shift = IsLittleEndian ? i * 8 : (Size - 1 - i) * 8;
EmitByte((Val >> Shift) & 0xff, OS);
}
}
}
/// encodeInstruction - Emit the instruction.
/// Size the instruction with Desc.getSize().
void MipsMCCodeEmitter::
encodeInstruction(const MCInst &MI, raw_ostream &OS,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const
{
// Non-pseudo instructions that get changed for direct object
// only based on operand values.
// If this list of instructions get much longer we will move
// the check to a function call. Until then, this is more efficient.
MCInst TmpInst = MI;
switch (MI.getOpcode()) {
// If shift amount is >= 32 it the inst needs to be lowered further
case Mips::DSLL:
case Mips::DSRL:
case Mips::DSRA:
case Mips::DROTR:
LowerLargeShift(TmpInst);
break;
// Compact branches, enforce encoding restrictions.
case Mips::BEQC:
case Mips::BNEC:
case Mips::BEQC64:
case Mips::BNEC64:
case Mips::BOVC:
case Mips::BOVC_MMR6:
case Mips::BNVC:
case Mips::BNVC_MMR6:
LowerCompactBranch(TmpInst);
}
unsigned long N = Fixups.size();
uint32_t Binary = getBinaryCodeForInstr(TmpInst, Fixups, STI);
// Check for unimplemented opcodes.
// Unfortunately in MIPS both NOP and SLL will come in with Binary == 0
// so we have to special check for them.
const unsigned Opcode = TmpInst.getOpcode();
if ((Opcode != Mips::NOP) && (Opcode != Mips::SLL) &&
(Opcode != Mips::SLL_MM) && (Opcode != Mips::SLL_MMR6) && !Binary)
llvm_unreachable("unimplemented opcode in encodeInstruction()");
int NewOpcode = -1;
if (isMicroMips(STI)) {
if (isMips32r6(STI)) {
NewOpcode = Mips::MipsR62MicroMipsR6(Opcode, Mips::Arch_micromipsr6);
if (NewOpcode == -1)
NewOpcode = Mips::Std2MicroMipsR6(Opcode, Mips::Arch_micromipsr6);
}
else
NewOpcode = Mips::Std2MicroMips(Opcode, Mips::Arch_micromips);
// Check whether it is Dsp instruction.
if (NewOpcode == -1)
NewOpcode = Mips::Dsp2MicroMips(Opcode, Mips::Arch_mmdsp);
if (NewOpcode != -1) {
if (Fixups.size() > N)
Fixups.pop_back();
TmpInst.setOpcode (NewOpcode);
Binary = getBinaryCodeForInstr(TmpInst, Fixups, STI);
}
if (((MI.getOpcode() == Mips::MOVEP_MM) ||
(MI.getOpcode() == Mips::MOVEP_MMR6))) {
unsigned RegPair = getMovePRegPairOpValue(MI, 0, Fixups, STI);
Binary = (Binary & 0xFFFFFC7F) | (RegPair << 7);
}
}
const MCInstrDesc &Desc = MCII.get(TmpInst.getOpcode());
// Get byte count of instruction
unsigned Size = Desc.getSize();
if (!Size)
llvm_unreachable("Desc.getSize() returns 0");
emitInstruction(Binary, Size, STI, OS);
}
/// getBranchTargetOpValue - Return binary encoding of the branch
/// target operand. If the machine operand requires relocation,
/// record the relocation and return zero.
unsigned MipsMCCodeEmitter::
getBranchTargetOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
// If the destination is an immediate, divide by 4.
if (MO.isImm()) return MO.getImm() >> 2;
assert(MO.isExpr() &&
"getBranchTargetOpValue expects only expressions or immediates");
const MCExpr *FixupExpression = MCBinaryExpr::createAdd(
MO.getExpr(), MCConstantExpr::create(-4, Ctx), Ctx);
Fixups.push_back(MCFixup::create(0, FixupExpression,
MCFixupKind(Mips::fixup_Mips_PC16)));
return 0;
}
/// getBranchTargetOpValue1SImm16 - Return binary encoding of the branch
/// target operand. If the machine operand requires relocation,
/// record the relocation and return zero.
unsigned MipsMCCodeEmitter::
getBranchTargetOpValue1SImm16(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
// If the destination is an immediate, divide by 2.
if (MO.isImm()) return MO.getImm() >> 1;
assert(MO.isExpr() &&
"getBranchTargetOpValue expects only expressions or immediates");
const MCExpr *FixupExpression = MCBinaryExpr::createAdd(
MO.getExpr(), MCConstantExpr::create(-4, Ctx), Ctx);
Fixups.push_back(MCFixup::create(0, FixupExpression,
MCFixupKind(Mips::fixup_Mips_PC16)));
return 0;
}
/// getBranchTargetOpValueMMR6 - Return binary encoding of the branch
/// target operand. If the machine operand requires relocation,
/// record the relocation and return zero.
unsigned MipsMCCodeEmitter::
getBranchTargetOpValueMMR6(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
// If the destination is an immediate, divide by 2.
if (MO.isImm())
return MO.getImm() >> 1;
assert(MO.isExpr() &&
"getBranchTargetOpValueMMR6 expects only expressions or immediates");
const MCExpr *FixupExpression = MCBinaryExpr::createAdd(
MO.getExpr(), MCConstantExpr::create(-2, Ctx), Ctx);
Fixups.push_back(MCFixup::create(0, FixupExpression,
MCFixupKind(Mips::fixup_Mips_PC16)));
return 0;
}
/// getBranchTargetOpValueLsl2MMR6 - Return binary encoding of the branch
/// target operand. If the machine operand requires relocation,
/// record the relocation and return zero.
unsigned MipsMCCodeEmitter::
getBranchTargetOpValueLsl2MMR6(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
// If the destination is an immediate, divide by 4.
if (MO.isImm())
return MO.getImm() >> 2;
assert(MO.isExpr() &&
"getBranchTargetOpValueLsl2MMR6 expects only expressions or immediates");
const MCExpr *FixupExpression = MCBinaryExpr::createAdd(
MO.getExpr(), MCConstantExpr::create(-4, Ctx), Ctx);
Fixups.push_back(MCFixup::create(0, FixupExpression,
MCFixupKind(Mips::fixup_Mips_PC16)));
return 0;
}
/// getBranchTarget7OpValueMM - Return binary encoding of the microMIPS branch
/// target operand. If the machine operand requires relocation,
/// record the relocation and return zero.
unsigned MipsMCCodeEmitter::
getBranchTarget7OpValueMM(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
// If the destination is an immediate, divide by 2.
if (MO.isImm()) return MO.getImm() >> 1;
assert(MO.isExpr() &&
"getBranchTargetOpValueMM expects only expressions or immediates");
const MCExpr *Expr = MO.getExpr();
Fixups.push_back(MCFixup::create(0, Expr,
MCFixupKind(Mips::fixup_MICROMIPS_PC7_S1)));
return 0;
}
/// getBranchTargetOpValueMMPC10 - Return binary encoding of the microMIPS
/// 10-bit branch target operand. If the machine operand requires relocation,
/// record the relocation and return zero.
unsigned MipsMCCodeEmitter::
getBranchTargetOpValueMMPC10(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
// If the destination is an immediate, divide by 2.
if (MO.isImm()) return MO.getImm() >> 1;
assert(MO.isExpr() &&
"getBranchTargetOpValuePC10 expects only expressions or immediates");
const MCExpr *Expr = MO.getExpr();
Fixups.push_back(MCFixup::create(0, Expr,
MCFixupKind(Mips::fixup_MICROMIPS_PC10_S1)));
return 0;
}
/// getBranchTargetOpValue - Return binary encoding of the microMIPS branch
/// target operand. If the machine operand requires relocation,
/// record the relocation and return zero.
unsigned MipsMCCodeEmitter::
getBranchTargetOpValueMM(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
// If the destination is an immediate, divide by 2.
if (MO.isImm()) return MO.getImm() >> 1;
assert(MO.isExpr() &&
"getBranchTargetOpValueMM expects only expressions or immediates");
const MCExpr *Expr = MO.getExpr();
Fixups.push_back(MCFixup::create(0, Expr,
MCFixupKind(Mips::
fixup_MICROMIPS_PC16_S1)));
return 0;
}
/// getBranchTarget21OpValue - Return binary encoding of the branch
/// target operand. If the machine operand requires relocation,
/// record the relocation and return zero.
unsigned MipsMCCodeEmitter::
getBranchTarget21OpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
// If the destination is an immediate, divide by 4.
if (MO.isImm()) return MO.getImm() >> 2;
assert(MO.isExpr() &&
"getBranchTarget21OpValue expects only expressions or immediates");
const MCExpr *FixupExpression = MCBinaryExpr::createAdd(
MO.getExpr(), MCConstantExpr::create(-4, Ctx), Ctx);
Fixups.push_back(MCFixup::create(0, FixupExpression,
MCFixupKind(Mips::fixup_MIPS_PC21_S2)));
return 0;
}
/// getBranchTarget21OpValueMM - Return binary encoding of the branch
/// target operand for microMIPS. If the machine operand requires
/// relocation, record the relocation and return zero.
unsigned MipsMCCodeEmitter::
getBranchTarget21OpValueMM(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
// If the destination is an immediate, divide by 4.
if (MO.isImm()) return MO.getImm() >> 2;
assert(MO.isExpr() &&
"getBranchTarget21OpValueMM expects only expressions or immediates");
const MCExpr *FixupExpression = MCBinaryExpr::createAdd(
MO.getExpr(), MCConstantExpr::create(-4, Ctx), Ctx);
Fixups.push_back(MCFixup::create(0, FixupExpression,
MCFixupKind(Mips::fixup_MICROMIPS_PC21_S1)));
return 0;
}
/// getBranchTarget26OpValue - Return binary encoding of the branch
/// target operand. If the machine operand requires relocation,
/// record the relocation and return zero.
unsigned MipsMCCodeEmitter::
getBranchTarget26OpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
// If the destination is an immediate, divide by 4.
if (MO.isImm()) return MO.getImm() >> 2;
assert(MO.isExpr() &&
"getBranchTarget26OpValue expects only expressions or immediates");
const MCExpr *FixupExpression = MCBinaryExpr::createAdd(
MO.getExpr(), MCConstantExpr::create(-4, Ctx), Ctx);
Fixups.push_back(MCFixup::create(0, FixupExpression,
MCFixupKind(Mips::fixup_MIPS_PC26_S2)));
return 0;
}
/// getBranchTarget26OpValueMM - Return binary encoding of the branch
/// target operand. If the machine operand requires relocation,
/// record the relocation and return zero.
unsigned MipsMCCodeEmitter::getBranchTarget26OpValueMM(
const MCInst &MI, unsigned OpNo, SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
// If the destination is an immediate, divide by 2.
if (MO.isImm())
return MO.getImm() >> 1;
assert(MO.isExpr() &&
"getBranchTarget26OpValueMM expects only expressions or immediates");
const MCExpr *FixupExpression = MCBinaryExpr::createAdd(
MO.getExpr(), MCConstantExpr::create(-4, Ctx), Ctx);
Fixups.push_back(MCFixup::create(0, FixupExpression,
MCFixupKind(Mips::fixup_MICROMIPS_PC26_S1)));
return 0;
}
/// getJumpOffset16OpValue - Return binary encoding of the jump
/// target operand. If the machine operand requires relocation,
/// record the relocation and return zero.
unsigned MipsMCCodeEmitter::
getJumpOffset16OpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
if (MO.isImm()) return MO.getImm();
assert(MO.isExpr() &&
"getJumpOffset16OpValue expects only expressions or an immediate");
const MCExpr *Expr = MO.getExpr();
Mips::Fixups FixupKind =
isMicroMips(STI) ? Mips::fixup_MICROMIPS_LO16 : Mips::fixup_Mips_LO16;
Fixups.push_back(MCFixup::create(0, Expr, MCFixupKind(FixupKind)));
return 0;
}
/// getJumpTargetOpValue - Return binary encoding of the jump
/// target operand. If the machine operand requires relocation,
/// record the relocation and return zero.
unsigned MipsMCCodeEmitter::
getJumpTargetOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
// If the destination is an immediate, divide by 4.
if (MO.isImm()) return MO.getImm()>>2;
assert(MO.isExpr() &&
"getJumpTargetOpValue expects only expressions or an immediate");
const MCExpr *Expr = MO.getExpr();
Fixups.push_back(MCFixup::create(0, Expr,
MCFixupKind(Mips::fixup_Mips_26)));
return 0;
}
unsigned MipsMCCodeEmitter::
getJumpTargetOpValueMM(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
// If the destination is an immediate, divide by 2.
if (MO.isImm()) return MO.getImm() >> 1;
assert(MO.isExpr() &&
"getJumpTargetOpValueMM expects only expressions or an immediate");
const MCExpr *Expr = MO.getExpr();
Fixups.push_back(MCFixup::create(0, Expr,
MCFixupKind(Mips::fixup_MICROMIPS_26_S1)));
return 0;
}
unsigned MipsMCCodeEmitter::
getUImm5Lsl2Encoding(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
if (MO.isImm()) {
// The immediate is encoded as 'immediate << 2'.
unsigned Res = getMachineOpValue(MI, MO, Fixups, STI);
assert((Res & 3) == 0);
return Res >> 2;
}
assert(MO.isExpr() &&
"getUImm5Lsl2Encoding expects only expressions or an immediate");
return 0;
}
unsigned MipsMCCodeEmitter::
getSImm3Lsa2Value(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
if (MO.isImm()) {
int Value = MO.getImm();
return Value >> 2;
}
return 0;
}
unsigned MipsMCCodeEmitter::
getUImm6Lsl2Encoding(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
if (MO.isImm()) {
unsigned Value = MO.getImm();
return Value >> 2;
}
return 0;
}
unsigned MipsMCCodeEmitter::
getSImm9AddiuspValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
if (MO.isImm()) {
unsigned Binary = (MO.getImm() >> 2) & 0x0000ffff;
return (((Binary & 0x8000) >> 7) | (Binary & 0x00ff));
}
return 0;
}
unsigned MipsMCCodeEmitter::
getExprOpValue(const MCExpr *Expr, SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
int64_t Res;
if (Expr->evaluateAsAbsolute(Res))
return Res;
MCExpr::ExprKind Kind = Expr->getKind();
if (Kind == MCExpr::Constant) {
return cast<MCConstantExpr>(Expr)->getValue();
}
if (Kind == MCExpr::Binary) {
unsigned Res =
getExprOpValue(cast<MCBinaryExpr>(Expr)->getLHS(), Fixups, STI);
Res += getExprOpValue(cast<MCBinaryExpr>(Expr)->getRHS(), Fixups, STI);
return Res;
}
if (Kind == MCExpr::Target) {
const MipsMCExpr *MipsExpr = cast<MipsMCExpr>(Expr);
Mips::Fixups FixupKind = Mips::Fixups(0);
switch (MipsExpr->getKind()) {
case MipsMCExpr::MEK_None:
case MipsMCExpr::MEK_Special:
llvm_unreachable("Unhandled fixup kind!");
break;
case MipsMCExpr::MEK_DTPREL:
// MEK_DTPREL is used for marking TLS DIEExpr only
// and contains a regular sub-expression.
return getExprOpValue(MipsExpr->getSubExpr(), Fixups, STI);
case MipsMCExpr::MEK_CALL_HI16:
FixupKind = Mips::fixup_Mips_CALL_HI16;
break;
case MipsMCExpr::MEK_CALL_LO16:
FixupKind = Mips::fixup_Mips_CALL_LO16;
break;
case MipsMCExpr::MEK_DTPREL_HI:
FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_TLS_DTPREL_HI16
: Mips::fixup_Mips_DTPREL_HI;
break;
case MipsMCExpr::MEK_DTPREL_LO:
FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_TLS_DTPREL_LO16
: Mips::fixup_Mips_DTPREL_LO;
break;
case MipsMCExpr::MEK_GOTTPREL:
FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_GOTTPREL
: Mips::fixup_Mips_GOTTPREL;
break;
case MipsMCExpr::MEK_GOT:
FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_GOT16
: Mips::fixup_Mips_GOT;
break;
case MipsMCExpr::MEK_GOT_CALL:
FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_CALL16
: Mips::fixup_Mips_CALL16;
break;
case MipsMCExpr::MEK_GOT_DISP:
FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_GOT_DISP
: Mips::fixup_Mips_GOT_DISP;
break;
case MipsMCExpr::MEK_GOT_HI16:
FixupKind = Mips::fixup_Mips_GOT_HI16;
break;
case MipsMCExpr::MEK_GOT_LO16:
FixupKind = Mips::fixup_Mips_GOT_LO16;
break;
case MipsMCExpr::MEK_GOT_PAGE:
FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_GOT_PAGE
: Mips::fixup_Mips_GOT_PAGE;
break;
case MipsMCExpr::MEK_GOT_OFST:
FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_GOT_OFST
: Mips::fixup_Mips_GOT_OFST;
break;
case MipsMCExpr::MEK_GPREL:
FixupKind = Mips::fixup_Mips_GPREL16;
break;
case MipsMCExpr::MEK_LO:
// Check for %lo(%neg(%gp_rel(X)))
if (MipsExpr->isGpOff())
FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_GPOFF_LO
: Mips::fixup_Mips_GPOFF_LO;
else
FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_LO16
: Mips::fixup_Mips_LO16;
break;
case MipsMCExpr::MEK_HIGHEST:
FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_HIGHEST
: Mips::fixup_Mips_HIGHEST;
break;
case MipsMCExpr::MEK_HIGHER:
FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_HIGHER
: Mips::fixup_Mips_HIGHER;
break;
case MipsMCExpr::MEK_HI:
// Check for %hi(%neg(%gp_rel(X)))
if (MipsExpr->isGpOff())
FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_GPOFF_HI
: Mips::fixup_Mips_GPOFF_HI;
else
FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_HI16
: Mips::fixup_Mips_HI16;
break;
case MipsMCExpr::MEK_PCREL_HI16:
FixupKind = Mips::fixup_MIPS_PCHI16;
break;
case MipsMCExpr::MEK_PCREL_LO16:
FixupKind = Mips::fixup_MIPS_PCLO16;
break;
case MipsMCExpr::MEK_TLSGD:
FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_TLS_GD
: Mips::fixup_Mips_TLSGD;
break;
case MipsMCExpr::MEK_TLSLDM:
FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_TLS_LDM
: Mips::fixup_Mips_TLSLDM;
break;
case MipsMCExpr::MEK_TPREL_HI:
FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_TLS_TPREL_HI16
: Mips::fixup_Mips_TPREL_HI;
break;
case MipsMCExpr::MEK_TPREL_LO:
FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_TLS_TPREL_LO16
: Mips::fixup_Mips_TPREL_LO;
break;
case MipsMCExpr::MEK_NEG:
FixupKind =
isMicroMips(STI) ? Mips::fixup_MICROMIPS_SUB : Mips::fixup_Mips_SUB;
break;
}
Fixups.push_back(MCFixup::create(0, MipsExpr, MCFixupKind(FixupKind)));
return 0;
}
if (Kind == MCExpr::SymbolRef)
Ctx.reportError(Expr->getLoc(), "expected an immediate");
return 0;
}
/// getMachineOpValue - Return binary encoding of operand. If the machine
/// operand requires relocation, record the relocation and return zero.
unsigned MipsMCCodeEmitter::
getMachineOpValue(const MCInst &MI, const MCOperand &MO,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
if (MO.isReg()) {
unsigned Reg = MO.getReg();
unsigned RegNo = Ctx.getRegisterInfo()->getEncodingValue(Reg);
return RegNo;
} else if (MO.isImm()) {
return static_cast<unsigned>(MO.getImm());
} else if (MO.isFPImm()) {
return static_cast<unsigned>(APFloat(MO.getFPImm())
.bitcastToAPInt().getHiBits(32).getLimitedValue());
}
// MO must be an Expr.
assert(MO.isExpr());
return getExprOpValue(MO.getExpr(),Fixups, STI);
}
/// Return binary encoding of memory related operand.
/// If the offset operand requires relocation, record the relocation.
template <unsigned ShiftAmount>
unsigned MipsMCCodeEmitter::getMemEncoding(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
// Base register is encoded in bits 20-16, offset is encoded in bits 15-0.
assert(MI.getOperand(OpNo).isReg());
unsigned RegBits = getMachineOpValue(MI, MI.getOperand(OpNo), Fixups, STI)
<< 16;
unsigned OffBits = getMachineOpValue(MI, MI.getOperand(OpNo+1), Fixups, STI);
// Apply the scale factor if there is one.
OffBits >>= ShiftAmount;
return (OffBits & 0xFFFF) | RegBits;
}
unsigned MipsMCCodeEmitter::
getMemEncodingMMImm4(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
// Base register is encoded in bits 6-4, offset is encoded in bits 3-0.
assert(MI.getOperand(OpNo).isReg());
unsigned RegBits = getMachineOpValue(MI, MI.getOperand(OpNo),
Fixups, STI) << 4;
unsigned OffBits = getMachineOpValue(MI, MI.getOperand(OpNo+1),
Fixups, STI);
return (OffBits & 0xF) | RegBits;
}
unsigned MipsMCCodeEmitter::
getMemEncodingMMImm4Lsl1(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
// Base register is encoded in bits 6-4, offset is encoded in bits 3-0.
assert(MI.getOperand(OpNo).isReg());
unsigned RegBits = getMachineOpValue(MI, MI.getOperand(OpNo),
Fixups, STI) << 4;
unsigned OffBits = getMachineOpValue(MI, MI.getOperand(OpNo+1),
Fixups, STI) >> 1;
return (OffBits & 0xF) | RegBits;
}
unsigned MipsMCCodeEmitter::
getMemEncodingMMImm4Lsl2(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
// Base register is encoded in bits 6-4, offset is encoded in bits 3-0.
assert(MI.getOperand(OpNo).isReg());
unsigned RegBits = getMachineOpValue(MI, MI.getOperand(OpNo),
Fixups, STI) << 4;
unsigned OffBits = getMachineOpValue(MI, MI.getOperand(OpNo+1),
Fixups, STI) >> 2;
return (OffBits & 0xF) | RegBits;
}
unsigned MipsMCCodeEmitter::
getMemEncodingMMSPImm5Lsl2(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
// Register is encoded in bits 9-5, offset is encoded in bits 4-0.
assert(MI.getOperand(OpNo).isReg() &&
(MI.getOperand(OpNo).getReg() == Mips::SP ||
MI.getOperand(OpNo).getReg() == Mips::SP_64) &&
"Unexpected base register!");
unsigned OffBits = getMachineOpValue(MI, MI.getOperand(OpNo+1),
Fixups, STI) >> 2;
return OffBits & 0x1F;
}
unsigned MipsMCCodeEmitter::
getMemEncodingMMGPImm7Lsl2(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
// Register is encoded in bits 9-7, offset is encoded in bits 6-0.
assert(MI.getOperand(OpNo).isReg() &&
MI.getOperand(OpNo).getReg() == Mips::GP &&
"Unexpected base register!");
unsigned OffBits = getMachineOpValue(MI, MI.getOperand(OpNo+1),
Fixups, STI) >> 2;
return OffBits & 0x7F;
}
unsigned MipsMCCodeEmitter::
getMemEncodingMMImm9(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
// Base register is encoded in bits 20-16, offset is encoded in bits 8-0.
assert(MI.getOperand(OpNo).isReg());
unsigned RegBits = getMachineOpValue(MI, MI.getOperand(OpNo), Fixups,
STI) << 16;
unsigned OffBits =
getMachineOpValue(MI, MI.getOperand(OpNo + 1), Fixups, STI);
return (OffBits & 0x1FF) | RegBits;
}
unsigned MipsMCCodeEmitter::
getMemEncodingMMImm11(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
// Base register is encoded in bits 20-16, offset is encoded in bits 10-0.
assert(MI.getOperand(OpNo).isReg());
unsigned RegBits = getMachineOpValue(MI, MI.getOperand(OpNo), Fixups,
STI) << 16;
unsigned OffBits = getMachineOpValue(MI, MI.getOperand(OpNo+1), Fixups, STI);
return (OffBits & 0x07FF) | RegBits;
}
unsigned MipsMCCodeEmitter::
getMemEncodingMMImm12(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
// opNum can be invalid if instruction had reglist as operand.
// MemOperand is always last operand of instruction (base + offset).
switch (MI.getOpcode()) {
default:
break;
case Mips::SWM32_MM:
case Mips::LWM32_MM:
OpNo = MI.getNumOperands() - 2;
break;
}
// Base register is encoded in bits 20-16, offset is encoded in bits 11-0.
assert(MI.getOperand(OpNo).isReg());
unsigned RegBits = getMachineOpValue(MI, MI.getOperand(OpNo), Fixups, STI)
<< 16;
unsigned OffBits = getMachineOpValue(MI, MI.getOperand(OpNo+1), Fixups, STI);
return (OffBits & 0x0FFF) | RegBits;
}
unsigned MipsMCCodeEmitter::
getMemEncodingMMImm16(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
// Base register is encoded in bits 20-16, offset is encoded in bits 15-0.
assert(MI.getOperand(OpNo).isReg());
unsigned RegBits = getMachineOpValue(MI, MI.getOperand(OpNo), Fixups,
STI) << 16;
unsigned OffBits = getMachineOpValue(MI, MI.getOperand(OpNo+1), Fixups, STI);
return (OffBits & 0xFFFF) | RegBits;
}
unsigned MipsMCCodeEmitter::
getMemEncodingMMImm4sp(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
// opNum can be invalid if instruction had reglist as operand
// MemOperand is always last operand of instruction (base + offset)
switch (MI.getOpcode()) {
default:
break;
case Mips::SWM16_MM:
case Mips::SWM16_MMR6:
case Mips::LWM16_MM:
case Mips::LWM16_MMR6:
OpNo = MI.getNumOperands() - 2;
break;
}
// Offset is encoded in bits 4-0.
assert(MI.getOperand(OpNo).isReg());
// Base register is always SP - thus it is not encoded.
assert(MI.getOperand(OpNo+1).isImm());
unsigned OffBits = getMachineOpValue(MI, MI.getOperand(OpNo+1), Fixups, STI);
return ((OffBits >> 2) & 0x0F);
}
// FIXME: should be called getMSBEncoding
//
unsigned
MipsMCCodeEmitter::getSizeInsEncoding(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
assert(MI.getOperand(OpNo-1).isImm());
assert(MI.getOperand(OpNo).isImm());
unsigned Position = getMachineOpValue(MI, MI.getOperand(OpNo-1), Fixups, STI);
unsigned Size = getMachineOpValue(MI, MI.getOperand(OpNo), Fixups, STI);
return Position + Size - 1;
}
template <unsigned Bits, int Offset>
unsigned
MipsMCCodeEmitter::getUImmWithOffsetEncoding(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
assert(MI.getOperand(OpNo).isImm());
unsigned Value = getMachineOpValue(MI, MI.getOperand(OpNo), Fixups, STI);
Value -= Offset;
return Value;
}
unsigned
MipsMCCodeEmitter::getSimm19Lsl2Encoding(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
if (MO.isImm()) {
// The immediate is encoded as 'immediate << 2'.
unsigned Res = getMachineOpValue(MI, MO, Fixups, STI);
assert((Res & 3) == 0);
return Res >> 2;
}
assert(MO.isExpr() &&
"getSimm19Lsl2Encoding expects only expressions or an immediate");
const MCExpr *Expr = MO.getExpr();
Mips::Fixups FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_PC19_S2
: Mips::fixup_MIPS_PC19_S2;
Fixups.push_back(MCFixup::create(0, Expr, MCFixupKind(FixupKind)));
return 0;
}
unsigned
MipsMCCodeEmitter::getSimm18Lsl3Encoding(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
if (MO.isImm()) {
// The immediate is encoded as 'immediate << 3'.
unsigned Res = getMachineOpValue(MI, MI.getOperand(OpNo), Fixups, STI);
assert((Res & 7) == 0);
return Res >> 3;
}
assert(MO.isExpr() &&
"getSimm18Lsl2Encoding expects only expressions or an immediate");
const MCExpr *Expr = MO.getExpr();
Mips::Fixups FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_PC18_S3
: Mips::fixup_MIPS_PC18_S3;
Fixups.push_back(MCFixup::create(0, Expr, MCFixupKind(FixupKind)));
return 0;
}
unsigned
MipsMCCodeEmitter::getUImm3Mod8Encoding(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
assert(MI.getOperand(OpNo).isImm());
const MCOperand &MO = MI.getOperand(OpNo);
return MO.getImm() % 8;
}
unsigned
MipsMCCodeEmitter::getUImm4AndValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
assert(MI.getOperand(OpNo).isImm());
const MCOperand &MO = MI.getOperand(OpNo);
unsigned Value = MO.getImm();
switch (Value) {
case 128: return 0x0;
case 1: return 0x1;
case 2: return 0x2;
case 3: return 0x3;
case 4: return 0x4;
case 7: return 0x5;
case 8: return 0x6;
case 15: return 0x7;
case 16: return 0x8;
case 31: return 0x9;
case 32: return 0xa;
case 63: return 0xb;
case 64: return 0xc;
case 255: return 0xd;
case 32768: return 0xe;
case 65535: return 0xf;
}
llvm_unreachable("Unexpected value");
}
unsigned
MipsMCCodeEmitter::getRegisterListOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
unsigned res = 0;
// Register list operand is always first operand of instruction and it is
// placed before memory operand (register + imm).
for (unsigned I = OpNo, E = MI.getNumOperands() - 2; I < E; ++I) {
unsigned Reg = MI.getOperand(I).getReg();
unsigned RegNo = Ctx.getRegisterInfo()->getEncodingValue(Reg);
if (RegNo != 31)
res++;
else
res |= 0x10;
}
return res;
}
unsigned
MipsMCCodeEmitter::getRegisterListOpValue16(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
return (MI.getNumOperands() - 4);
}
unsigned
MipsMCCodeEmitter::getMovePRegPairOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
unsigned res = 0;
if (MI.getOperand(0).getReg() == Mips::A1 &&
MI.getOperand(1).getReg() == Mips::A2)
res = 0;
else if (MI.getOperand(0).getReg() == Mips::A1 &&
MI.getOperand(1).getReg() == Mips::A3)
res = 1;
else if (MI.getOperand(0).getReg() == Mips::A2 &&
MI.getOperand(1).getReg() == Mips::A3)
res = 2;
else if (MI.getOperand(0).getReg() == Mips::A0 &&
MI.getOperand(1).getReg() == Mips::S5)
res = 3;
else if (MI.getOperand(0).getReg() == Mips::A0 &&
MI.getOperand(1).getReg() == Mips::S6)
res = 4;
else if (MI.getOperand(0).getReg() == Mips::A0 &&
MI.getOperand(1).getReg() == Mips::A1)
res = 5;
else if (MI.getOperand(0).getReg() == Mips::A0 &&
MI.getOperand(1).getReg() == Mips::A2)
res = 6;
else if (MI.getOperand(0).getReg() == Mips::A0 &&
MI.getOperand(1).getReg() == Mips::A3)
res = 7;
return res;
}
unsigned
MipsMCCodeEmitter::getMovePRegSingleOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
assert(((OpNo == 2) || (OpNo == 3)) &&
"Unexpected OpNo for movep operand encoding!");
MCOperand Op = MI.getOperand(OpNo);
assert(Op.isReg() && "Operand of movep is not a register!");
switch (Op.getReg()) {
default:
llvm_unreachable("Unknown register for movep!");
case Mips::ZERO: return 0;
case Mips::S1: return 1;
case Mips::V0: return 2;
case Mips::V1: return 3;
case Mips::S0: return 4;
case Mips::S2: return 5;
case Mips::S3: return 6;
case Mips::S4: return 7;
}
}
unsigned
MipsMCCodeEmitter::getSimm23Lsl2Encoding(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
assert(MO.isImm() && "getSimm23Lsl2Encoding expects only an immediate");
// The immediate is encoded as 'immediate >> 2'.
unsigned Res = static_cast<unsigned>(MO.getImm());
assert((Res & 3) == 0);
return Res >> 2;
}
#include "MipsGenMCCodeEmitter.inc"