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|
//===-- XtensaMCCodeEmitter.cpp - Convert Xtensa Code to Machine Code -----===//
//
// The LLVM Compiler Infrastructure
//
// 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 XtensaMCCodeEmitter class.
//
//===----------------------------------------------------------------------===//
#include "MCTargetDesc/XtensaFixupKinds.h"
#include "MCTargetDesc/XtensaMCExpr.h"
#include "MCTargetDesc/XtensaMCTargetDesc.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#define GET_INSTRMAP_INFO
#include "XtensaGenInstrInfo.inc"
#undef GET_INSTRMAP_INFO
using namespace llvm;
#define DEBUG_TYPE "mccodeemitter"
namespace {
class XtensaMCCodeEmitter : public MCCodeEmitter {
const MCInstrInfo &MCII;
MCContext &Ctx;
bool IsLittleEndian;
public:
XtensaMCCodeEmitter(const MCInstrInfo &mcii, MCContext &ctx, bool isLE)
: MCII(mcii), Ctx(ctx), IsLittleEndian(isLE) {}
~XtensaMCCodeEmitter() {}
// OVerride MCCodeEmitter.
void encodeInstruction(const MCInst &MI, SmallVectorImpl<char> &CB,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const override;
private:
// Automatically generated by TableGen.
uint64_t getBinaryCodeForInstr(const MCInst &MI,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
// Called by the TableGen code to get the binary encoding of operand
// MO in MI. Fixups is the list of fixups against MI.
uint32_t getMachineOpValue(const MCInst &MI, const MCOperand &MO,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint32_t getJumpTargetEncoding(const MCInst &MI, unsigned int OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint32_t getBranchTargetEncoding(const MCInst &MI, unsigned int OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint32_t getCallEncoding(const MCInst &MI, unsigned int OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint32_t getL32RTargetEncoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint32_t getMemRegEncoding(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint32_t getImm8OpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint32_t getImm8_sh8OpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint32_t getImm12OpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint32_t getUimm4OpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint32_t getUimm5OpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint32_t getImm1_16OpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint32_t getShimm1_31OpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint32_t getB4constOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint32_t getB4constuOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
};
} // namespace
MCCodeEmitter *llvm::createXtensaMCCodeEmitter(const MCInstrInfo &MCII,
MCContext &Ctx) {
return new XtensaMCCodeEmitter(MCII, Ctx, true);
}
void XtensaMCCodeEmitter::encodeInstruction(const MCInst &MI,
SmallVectorImpl<char> &CB,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
uint64_t Bits = getBinaryCodeForInstr(MI, Fixups, STI);
unsigned Size = MCII.get(MI.getOpcode()).getSize();
if (IsLittleEndian) {
// Little-endian insertion of Size bytes.
unsigned ShiftValue = 0;
for (unsigned I = 0; I != Size; ++I) {
CB.push_back(char(Bits >> ShiftValue));
ShiftValue += 8;
}
} else {
// TODO Big-endian insertion of Size bytes.
report_fatal_error("Big-endian mode currently is not supported!");
}
}
uint32_t
XtensaMCCodeEmitter::getMachineOpValue(const MCInst &MI, const MCOperand &MO,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
if (MO.isReg())
return Ctx.getRegisterInfo()->getEncodingValue(MO.getReg());
if (MO.isImm()) {
uint32_t Res = static_cast<uint32_t>(MO.getImm());
return Res;
}
report_fatal_error("Unhandled expression!");
return 0;
}
uint32_t
XtensaMCCodeEmitter::getJumpTargetEncoding(const MCInst &MI, unsigned int OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNum);
if (MO.isImm())
return MO.getImm();
const MCExpr *Expr = MO.getExpr();
Fixups.push_back(MCFixup::create(
0, Expr, MCFixupKind(Xtensa::fixup_xtensa_jump_18), MI.getLoc()));
return 0;
}
uint32_t XtensaMCCodeEmitter::getBranchTargetEncoding(
const MCInst &MI, unsigned int OpNum, SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNum);
if (MO.isImm())
return static_cast<uint32_t>(MO.getImm());
const MCExpr *Expr = MO.getExpr();
switch (MI.getOpcode()) {
case Xtensa::BEQZ:
case Xtensa::BGEZ:
case Xtensa::BLTZ:
case Xtensa::BNEZ:
Fixups.push_back(MCFixup::create(
0, Expr, MCFixupKind(Xtensa::fixup_xtensa_branch_12), MI.getLoc()));
return 0;
default:
Fixups.push_back(MCFixup::create(
0, Expr, MCFixupKind(Xtensa::fixup_xtensa_branch_8), MI.getLoc()));
return 0;
}
}
uint32_t
XtensaMCCodeEmitter::getCallEncoding(const MCInst &MI, unsigned int OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNum);
if (MO.isImm()) {
int32_t Res = MO.getImm();
if (Res & 0x3) {
llvm_unreachable("Unexpected operand value!");
}
Res >>= 2;
return Res;
}
assert((MO.isExpr()) && "Unexpected operand value!");
const MCExpr *Expr = MO.getExpr();
Fixups.push_back(MCFixup::create(
0, Expr, MCFixupKind(Xtensa::fixup_xtensa_call_18), MI.getLoc()));
return 0;
}
uint32_t
XtensaMCCodeEmitter::getL32RTargetEncoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNum);
if (MO.isImm()) {
int32_t Res = MO.getImm();
// We don't check first 2 bits, because in these bits we could store first 2
// bits of instruction address
Res >>= 2;
return Res;
}
assert((MO.isExpr()) && "Unexpected operand value!");
Fixups.push_back(MCFixup::create(
0, MO.getExpr(), MCFixupKind(Xtensa::fixup_xtensa_l32r_16), MI.getLoc()));
return 0;
}
uint32_t
XtensaMCCodeEmitter::getMemRegEncoding(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
assert(MI.getOperand(OpNo + 1).isImm());
uint32_t Res = static_cast<uint32_t>(MI.getOperand(OpNo + 1).getImm());
switch (MI.getOpcode()) {
case Xtensa::S16I:
case Xtensa::L16SI:
case Xtensa::L16UI:
if (Res & 0x1) {
report_fatal_error("Unexpected operand value!");
}
Res >>= 1;
break;
case Xtensa::S32I:
case Xtensa::L32I:
if (Res & 0x3) {
report_fatal_error("Unexpected operand value!");
}
Res >>= 2;
break;
}
assert((isUInt<8>(Res)) && "Unexpected operand value!");
uint32_t OffBits = Res << 4;
uint32_t RegBits = getMachineOpValue(MI, MI.getOperand(OpNo), Fixups, STI);
return ((OffBits & 0xFF0) | RegBits);
}
uint32_t XtensaMCCodeEmitter::getImm8OpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
int32_t Res = MO.getImm();
assert(((Res >= -128) && (Res <= 127)) && "Unexpected operand value!");
return (Res & 0xff);
}
uint32_t
XtensaMCCodeEmitter::getImm8_sh8OpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
int32_t Res = MO.getImm();
assert(((Res >= -32768) && (Res <= 32512) && ((Res & 0xff) == 0)) &&
"Unexpected operand value!");
return (Res & 0xffff);
}
uint32_t
XtensaMCCodeEmitter::getImm12OpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
int32_t Res = MO.getImm();
assert(((Res >= -2048) && (Res <= 2047)) && "Unexpected operand value!");
return (Res & 0xfff);
}
uint32_t
XtensaMCCodeEmitter::getUimm4OpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
uint32_t Res = static_cast<uint32_t>(MO.getImm());
assert((Res <= 15) && "Unexpected operand value!");
return Res & 0xf;
}
uint32_t
XtensaMCCodeEmitter::getUimm5OpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
uint32_t Res = static_cast<uint32_t>(MO.getImm());
assert((Res <= 31) && "Unexpected operand value!");
return (Res & 0x1f);
}
uint32_t
XtensaMCCodeEmitter::getShimm1_31OpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
uint32_t Res = static_cast<uint32_t>(MO.getImm());
assert(((Res >= 1) && (Res <= 31)) && "Unexpected operand value!");
return ((32 - Res) & 0x1f);
}
uint32_t
XtensaMCCodeEmitter::getImm1_16OpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
uint32_t Res = static_cast<uint32_t>(MO.getImm());
assert(((Res >= 1) && (Res <= 16)) && "Unexpected operand value!");
return (Res - 1);
}
uint32_t
XtensaMCCodeEmitter::getB4constOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
uint32_t Res = static_cast<uint32_t>(MO.getImm());
switch (Res) {
case 0xffffffff:
Res = 0;
break;
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
case 8:
break;
case 10:
Res = 9;
break;
case 12:
Res = 10;
break;
case 16:
Res = 11;
break;
case 32:
Res = 12;
break;
case 64:
Res = 13;
break;
case 128:
Res = 14;
break;
case 256:
Res = 15;
break;
default:
llvm_unreachable("Unexpected operand value!");
}
return Res;
}
uint32_t
XtensaMCCodeEmitter::getB4constuOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
uint32_t Res = static_cast<uint32_t>(MO.getImm());
switch (Res) {
case 32768:
Res = 0;
break;
case 65536:
Res = 1;
break;
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
case 8:
break;
case 10:
Res = 9;
break;
case 12:
Res = 10;
break;
case 16:
Res = 11;
break;
case 32:
Res = 12;
break;
case 64:
Res = 13;
break;
case 128:
Res = 14;
break;
case 256:
Res = 15;
break;
default:
llvm_unreachable("Unexpected operand value!");
}
return Res;
}
#include "XtensaGenMCCodeEmitter.inc"
|
