544 lines
20 KiB
C++
544 lines
20 KiB
C++
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//===-- PPCMCCodeEmitter.cpp - Convert PPC code to machine code -----------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the PPCMCCodeEmitter class.
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//
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//===----------------------------------------------------------------------===//
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#include "PPCMCCodeEmitter.h"
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#include "MCTargetDesc/PPCFixupKinds.h"
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#include "PPCMCTargetDesc.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCFixup.h"
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#include "llvm/MC/MCInstrDesc.h"
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#include "llvm/MC/MCRegisterInfo.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/EndianStream.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/TargetParser/Triple.h"
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#include <cassert>
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#include <cstdint>
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using namespace llvm;
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#define DEBUG_TYPE "mccodeemitter"
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STATISTIC(MCNumEmitted, "Number of MC instructions emitted");
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MCCodeEmitter *llvm::createPPCMCCodeEmitter(const MCInstrInfo &MCII,
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MCContext &Ctx) {
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return new PPCMCCodeEmitter(MCII, Ctx);
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}
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unsigned PPCMCCodeEmitter::
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getDirectBrEncoding(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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const MCOperand &MO = MI.getOperand(OpNo);
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if (MO.isReg() || MO.isImm())
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return getMachineOpValue(MI, MO, Fixups, STI);
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// Add a fixup for the branch target.
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Fixups.push_back(MCFixup::create(0, MO.getExpr(),
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(isNoTOCCallInstr(MI)
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? (MCFixupKind)PPC::fixup_ppc_br24_notoc
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: (MCFixupKind)PPC::fixup_ppc_br24)));
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return 0;
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}
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/// Check if Opcode corresponds to a call instruction that should be marked
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/// with the NOTOC relocation.
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bool PPCMCCodeEmitter::isNoTOCCallInstr(const MCInst &MI) const {
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unsigned Opcode = MI.getOpcode();
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if (!MCII.get(Opcode).isCall())
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return false;
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switch (Opcode) {
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default:
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#ifndef NDEBUG
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llvm_unreachable("Unknown call opcode");
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#endif
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return false;
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case PPC::BL8_NOTOC:
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case PPC::BL8_NOTOC_TLS:
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case PPC::BL8_NOTOC_RM:
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return true;
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#ifndef NDEBUG
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case PPC::BL8:
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case PPC::BL:
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case PPC::BL8_TLS:
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case PPC::BL_TLS:
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case PPC::BLA8:
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case PPC::BLA:
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case PPC::BCCL:
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case PPC::BCCLA:
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case PPC::BCL:
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case PPC::BCLn:
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case PPC::BL8_NOP:
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case PPC::BL_NOP:
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case PPC::BL8_NOP_TLS:
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case PPC::BLA8_NOP:
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case PPC::BCTRL8:
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case PPC::BCTRL:
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case PPC::BCCCTRL8:
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case PPC::BCCCTRL:
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case PPC::BCCTRL8:
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case PPC::BCCTRL:
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case PPC::BCCTRL8n:
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case PPC::BCCTRLn:
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case PPC::BL8_RM:
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case PPC::BLA8_RM:
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case PPC::BL8_NOP_RM:
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case PPC::BLA8_NOP_RM:
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case PPC::BCTRL8_RM:
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case PPC::BCTRL8_LDinto_toc:
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case PPC::BCTRL8_LDinto_toc_RM:
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case PPC::BL8_TLS_:
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case PPC::TCRETURNdi8:
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case PPC::TCRETURNai8:
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case PPC::TCRETURNri8:
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case PPC::TAILBCTR8:
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case PPC::TAILB8:
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case PPC::TAILBA8:
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case PPC::BCLalways:
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case PPC::BLRL:
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case PPC::BCCLRL:
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case PPC::BCLRL:
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case PPC::BCLRLn:
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case PPC::BDZL:
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case PPC::BDNZL:
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case PPC::BDZLA:
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case PPC::BDNZLA:
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case PPC::BDZLp:
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case PPC::BDNZLp:
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case PPC::BDZLAp:
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case PPC::BDNZLAp:
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case PPC::BDZLm:
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case PPC::BDNZLm:
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case PPC::BDZLAm:
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case PPC::BDNZLAm:
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case PPC::BDZLRL:
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case PPC::BDNZLRL:
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case PPC::BDZLRLp:
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case PPC::BDNZLRLp:
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case PPC::BDZLRLm:
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case PPC::BDNZLRLm:
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case PPC::BL_RM:
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case PPC::BLA_RM:
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case PPC::BL_NOP_RM:
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case PPC::BCTRL_RM:
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case PPC::TCRETURNdi:
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case PPC::TCRETURNai:
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case PPC::TCRETURNri:
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case PPC::BCTRL_LWZinto_toc:
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case PPC::BCTRL_LWZinto_toc_RM:
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case PPC::TAILBCTR:
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case PPC::TAILB:
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case PPC::TAILBA:
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return false;
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#endif
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}
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}
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unsigned PPCMCCodeEmitter::getCondBrEncoding(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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const MCOperand &MO = MI.getOperand(OpNo);
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if (MO.isReg() || MO.isImm()) return getMachineOpValue(MI, MO, Fixups, STI);
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// Add a fixup for the branch target.
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Fixups.push_back(MCFixup::create(0, MO.getExpr(),
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(MCFixupKind)PPC::fixup_ppc_brcond14));
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return 0;
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}
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unsigned PPCMCCodeEmitter::
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getAbsDirectBrEncoding(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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const MCOperand &MO = MI.getOperand(OpNo);
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if (MO.isReg() || MO.isImm()) return getMachineOpValue(MI, MO, Fixups, STI);
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// Add a fixup for the branch target.
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Fixups.push_back(MCFixup::create(0, MO.getExpr(),
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(MCFixupKind)PPC::fixup_ppc_br24abs));
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return 0;
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}
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unsigned PPCMCCodeEmitter::
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getAbsCondBrEncoding(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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const MCOperand &MO = MI.getOperand(OpNo);
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if (MO.isReg() || MO.isImm()) return getMachineOpValue(MI, MO, Fixups, STI);
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// Add a fixup for the branch target.
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Fixups.push_back(MCFixup::create(0, MO.getExpr(),
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(MCFixupKind)PPC::fixup_ppc_brcond14abs));
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return 0;
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}
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unsigned
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PPCMCCodeEmitter::getVSRpEvenEncoding(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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assert(MI.getOperand(OpNo).isReg() && "Operand should be a register");
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unsigned RegBits = getMachineOpValue(MI, MI.getOperand(OpNo), Fixups, STI)
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<< 1;
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return RegBits;
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}
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unsigned PPCMCCodeEmitter::getImm16Encoding(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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const MCOperand &MO = MI.getOperand(OpNo);
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if (MO.isReg() || MO.isImm()) return getMachineOpValue(MI, MO, Fixups, STI);
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// Add a fixup for the immediate field.
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Fixups.push_back(MCFixup::create(IsLittleEndian? 0 : 2, MO.getExpr(),
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(MCFixupKind)PPC::fixup_ppc_half16));
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return 0;
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}
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uint64_t PPCMCCodeEmitter::getImm34Encoding(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI,
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MCFixupKind Fixup) const {
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const MCOperand &MO = MI.getOperand(OpNo);
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assert(!MO.isReg() && "Not expecting a register for this operand.");
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if (MO.isImm())
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return getMachineOpValue(MI, MO, Fixups, STI);
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// Add a fixup for the immediate field.
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Fixups.push_back(MCFixup::create(0, MO.getExpr(), Fixup));
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return 0;
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}
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uint64_t
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PPCMCCodeEmitter::getImm34EncodingNoPCRel(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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return getImm34Encoding(MI, OpNo, Fixups, STI,
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(MCFixupKind)PPC::fixup_ppc_imm34);
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}
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uint64_t
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PPCMCCodeEmitter::getImm34EncodingPCRel(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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return getImm34Encoding(MI, OpNo, Fixups, STI,
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(MCFixupKind)PPC::fixup_ppc_pcrel34);
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}
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unsigned PPCMCCodeEmitter::getDispRIEncoding(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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const MCOperand &MO = MI.getOperand(OpNo);
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if (MO.isImm())
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return getMachineOpValue(MI, MO, Fixups, STI) & 0xFFFF;
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// Add a fixup for the displacement field.
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Fixups.push_back(MCFixup::create(IsLittleEndian? 0 : 2, MO.getExpr(),
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(MCFixupKind)PPC::fixup_ppc_half16));
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return 0;
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}
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unsigned
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PPCMCCodeEmitter::getDispRIXEncoding(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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const MCOperand &MO = MI.getOperand(OpNo);
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if (MO.isImm())
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return ((getMachineOpValue(MI, MO, Fixups, STI) >> 2) & 0x3FFF);
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// Add a fixup for the displacement field.
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Fixups.push_back(MCFixup::create(IsLittleEndian? 0 : 2, MO.getExpr(),
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(MCFixupKind)PPC::fixup_ppc_half16ds));
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return 0;
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}
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unsigned
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PPCMCCodeEmitter::getDispRIX16Encoding(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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const MCOperand &MO = MI.getOperand(OpNo);
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if (MO.isImm()) {
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assert(!(MO.getImm() % 16) &&
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"Expecting an immediate that is a multiple of 16");
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return ((getMachineOpValue(MI, MO, Fixups, STI) >> 4) & 0xFFF);
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}
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// Otherwise add a fixup for the displacement field.
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Fixups.push_back(MCFixup::create(IsLittleEndian ? 0 : 2, MO.getExpr(),
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(MCFixupKind)PPC::fixup_ppc_half16dq));
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return 0;
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}
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unsigned
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PPCMCCodeEmitter::getDispRIHashEncoding(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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// Encode imm for the hash load/store to stack for the ROP Protection
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// instructions.
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const MCOperand &MO = MI.getOperand(OpNo);
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assert(MO.isImm() && "Expecting an immediate operand.");
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assert(!(MO.getImm() % 8) && "Expecting offset to be 8 byte aligned.");
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unsigned DX = (MO.getImm() >> 3) & 0x3F;
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return DX;
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}
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uint64_t
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PPCMCCodeEmitter::getDispRI34PCRelEncoding(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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// Encode the displacement part of pc-relative memri34, which is an imm34.
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// The 34 bit immediate can fall into one of three cases:
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// 1) It is a relocation to be filled in by the linker represented as:
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// (MCExpr::SymbolRef)
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// 2) It is a relocation + SignedOffset represented as:
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// (MCExpr::Binary(MCExpr::SymbolRef + MCExpr::Constant))
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// 3) It is a known value at compile time.
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// If this is not a MCExpr then we are in case 3) and we are dealing with
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// a value known at compile time, not a relocation.
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const MCOperand &MO = MI.getOperand(OpNo);
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if (!MO.isExpr())
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return (getMachineOpValue(MI, MO, Fixups, STI)) & 0x3FFFFFFFFUL;
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// At this point in the function it is known that MO is of type MCExpr.
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// Therefore we are dealing with either case 1) a symbol ref or
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// case 2) a symbol ref plus a constant.
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const MCExpr *Expr = MO.getExpr();
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switch (Expr->getKind()) {
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default:
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llvm_unreachable("Unsupported MCExpr for getMemRI34PCRelEncoding.");
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case MCExpr::SymbolRef: {
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// Relocation alone.
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const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(Expr);
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(void)SRE;
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// Currently these are the only valid PCRelative Relocations.
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assert((SRE->getKind() == MCSymbolRefExpr::VK_PCREL ||
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SRE->getKind() == MCSymbolRefExpr::VK_PPC_GOT_PCREL ||
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SRE->getKind() == MCSymbolRefExpr::VK_PPC_GOT_TLSGD_PCREL ||
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||
|
|
SRE->getKind() == MCSymbolRefExpr::VK_PPC_GOT_TLSLD_PCREL ||
|
||
|
|
SRE->getKind() == MCSymbolRefExpr::VK_PPC_GOT_TPREL_PCREL) &&
|
||
|
|
"VariantKind must be VK_PCREL or VK_PPC_GOT_PCREL or "
|
||
|
|
"VK_PPC_GOT_TLSGD_PCREL or VK_PPC_GOT_TLSLD_PCREL or "
|
||
|
|
"VK_PPC_GOT_TPREL_PCREL.");
|
||
|
|
// Generate the fixup for the relocation.
|
||
|
|
Fixups.push_back(
|
||
|
|
MCFixup::create(0, Expr,
|
||
|
|
static_cast<MCFixupKind>(PPC::fixup_ppc_pcrel34)));
|
||
|
|
// Put zero in the location of the immediate. The linker will fill in the
|
||
|
|
// correct value based on the relocation.
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
case MCExpr::Binary: {
|
||
|
|
// Relocation plus some offset.
|
||
|
|
const MCBinaryExpr *BE = cast<MCBinaryExpr>(Expr);
|
||
|
|
assert(BE->getOpcode() == MCBinaryExpr::Add &&
|
||
|
|
"Binary expression opcode must be an add.");
|
||
|
|
|
||
|
|
const MCExpr *LHS = BE->getLHS();
|
||
|
|
const MCExpr *RHS = BE->getRHS();
|
||
|
|
|
||
|
|
// Need to check in both directions. Reloc+Offset and Offset+Reloc.
|
||
|
|
if (LHS->getKind() != MCExpr::SymbolRef)
|
||
|
|
std::swap(LHS, RHS);
|
||
|
|
|
||
|
|
if (LHS->getKind() != MCExpr::SymbolRef ||
|
||
|
|
RHS->getKind() != MCExpr::Constant)
|
||
|
|
llvm_unreachable("Expecting to have one constant and one relocation.");
|
||
|
|
|
||
|
|
const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(LHS);
|
||
|
|
(void)SRE;
|
||
|
|
assert(isInt<34>(cast<MCConstantExpr>(RHS)->getValue()) &&
|
||
|
|
"Value must fit in 34 bits.");
|
||
|
|
|
||
|
|
// Currently these are the only valid PCRelative Relocations.
|
||
|
|
assert((SRE->getKind() == MCSymbolRefExpr::VK_PCREL ||
|
||
|
|
SRE->getKind() == MCSymbolRefExpr::VK_PPC_GOT_PCREL) &&
|
||
|
|
"VariantKind must be VK_PCREL or VK_PPC_GOT_PCREL");
|
||
|
|
// Generate the fixup for the relocation.
|
||
|
|
Fixups.push_back(
|
||
|
|
MCFixup::create(0, Expr,
|
||
|
|
static_cast<MCFixupKind>(PPC::fixup_ppc_pcrel34)));
|
||
|
|
// Put zero in the location of the immediate. The linker will fill in the
|
||
|
|
// correct value based on the relocation.
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
uint64_t
|
||
|
|
PPCMCCodeEmitter::getDispRI34Encoding(const MCInst &MI, unsigned OpNo,
|
||
|
|
SmallVectorImpl<MCFixup> &Fixups,
|
||
|
|
const MCSubtargetInfo &STI) const {
|
||
|
|
// Encode the displacement part of a memri34.
|
||
|
|
const MCOperand &MO = MI.getOperand(OpNo);
|
||
|
|
return (getMachineOpValue(MI, MO, Fixups, STI)) & 0x3FFFFFFFFUL;
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned
|
||
|
|
PPCMCCodeEmitter::getDispSPE8Encoding(const MCInst &MI, unsigned OpNo,
|
||
|
|
SmallVectorImpl<MCFixup> &Fixups,
|
||
|
|
const MCSubtargetInfo &STI) const {
|
||
|
|
// Encode imm as a dispSPE8, which has the low 5-bits of (imm / 8).
|
||
|
|
const MCOperand &MO = MI.getOperand(OpNo);
|
||
|
|
assert(MO.isImm());
|
||
|
|
return getMachineOpValue(MI, MO, Fixups, STI) >> 3;
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned
|
||
|
|
PPCMCCodeEmitter::getDispSPE4Encoding(const MCInst &MI, unsigned OpNo,
|
||
|
|
SmallVectorImpl<MCFixup> &Fixups,
|
||
|
|
const MCSubtargetInfo &STI) const {
|
||
|
|
// Encode imm as a dispSPE8, which has the low 5-bits of (imm / 4).
|
||
|
|
const MCOperand &MO = MI.getOperand(OpNo);
|
||
|
|
assert(MO.isImm());
|
||
|
|
return getMachineOpValue(MI, MO, Fixups, STI) >> 2;
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned
|
||
|
|
PPCMCCodeEmitter::getDispSPE2Encoding(const MCInst &MI, unsigned OpNo,
|
||
|
|
SmallVectorImpl<MCFixup> &Fixups,
|
||
|
|
const MCSubtargetInfo &STI) const {
|
||
|
|
// Encode imm as a dispSPE8, which has the low 5-bits of (imm / 2).
|
||
|
|
const MCOperand &MO = MI.getOperand(OpNo);
|
||
|
|
assert(MO.isImm());
|
||
|
|
return getMachineOpValue(MI, MO, Fixups, STI) >> 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned PPCMCCodeEmitter::getTLSRegEncoding(const MCInst &MI, unsigned OpNo,
|
||
|
|
SmallVectorImpl<MCFixup> &Fixups,
|
||
|
|
const MCSubtargetInfo &STI) const {
|
||
|
|
const MCOperand &MO = MI.getOperand(OpNo);
|
||
|
|
if (MO.isReg()) return getMachineOpValue(MI, MO, Fixups, STI);
|
||
|
|
|
||
|
|
// Add a fixup for the TLS register, which simply provides a relocation
|
||
|
|
// hint to the linker that this statement is part of a relocation sequence.
|
||
|
|
// Return the thread-pointer register's encoding. Add a one byte displacement
|
||
|
|
// if using PC relative memops.
|
||
|
|
const MCExpr *Expr = MO.getExpr();
|
||
|
|
const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(Expr);
|
||
|
|
bool IsPCRel = SRE->getKind() == MCSymbolRefExpr::VK_PPC_TLS_PCREL;
|
||
|
|
Fixups.push_back(MCFixup::create(IsPCRel ? 1 : 0, Expr,
|
||
|
|
(MCFixupKind)PPC::fixup_ppc_nofixup));
|
||
|
|
const Triple &TT = STI.getTargetTriple();
|
||
|
|
bool isPPC64 = TT.isPPC64();
|
||
|
|
return CTX.getRegisterInfo()->getEncodingValue(isPPC64 ? PPC::X13 : PPC::R2);
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned PPCMCCodeEmitter::getTLSCallEncoding(const MCInst &MI, unsigned OpNo,
|
||
|
|
SmallVectorImpl<MCFixup> &Fixups,
|
||
|
|
const MCSubtargetInfo &STI) const {
|
||
|
|
// For special TLS calls, we need two fixups; one for the branch target
|
||
|
|
// (__tls_get_addr), which we create via getDirectBrEncoding as usual,
|
||
|
|
// and one for the TLSGD or TLSLD symbol, which is emitted here.
|
||
|
|
const MCOperand &MO = MI.getOperand(OpNo+1);
|
||
|
|
Fixups.push_back(MCFixup::create(0, MO.getExpr(),
|
||
|
|
(MCFixupKind)PPC::fixup_ppc_nofixup));
|
||
|
|
return getDirectBrEncoding(MI, OpNo, Fixups, STI);
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned PPCMCCodeEmitter::
|
||
|
|
get_crbitm_encoding(const MCInst &MI, unsigned OpNo,
|
||
|
|
SmallVectorImpl<MCFixup> &Fixups,
|
||
|
|
const MCSubtargetInfo &STI) const {
|
||
|
|
const MCOperand &MO = MI.getOperand(OpNo);
|
||
|
|
assert((MI.getOpcode() == PPC::MTOCRF || MI.getOpcode() == PPC::MTOCRF8 ||
|
||
|
|
MI.getOpcode() == PPC::MFOCRF || MI.getOpcode() == PPC::MFOCRF8) &&
|
||
|
|
(MO.getReg() >= PPC::CR0 && MO.getReg() <= PPC::CR7));
|
||
|
|
return 0x80 >> CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
|
||
|
|
}
|
||
|
|
|
||
|
|
// Get the index for this operand in this instruction. This is needed for
|
||
|
|
// computing the register number in PPC::getRegNumForOperand() for
|
||
|
|
// any instructions that use a different numbering scheme for registers in
|
||
|
|
// different operands.
|
||
|
|
static unsigned getOpIdxForMO(const MCInst &MI, const MCOperand &MO) {
|
||
|
|
for (unsigned i = 0; i < MI.getNumOperands(); i++) {
|
||
|
|
const MCOperand &Op = MI.getOperand(i);
|
||
|
|
if (&Op == &MO)
|
||
|
|
return i;
|
||
|
|
}
|
||
|
|
llvm_unreachable("This operand is not part of this instruction");
|
||
|
|
return ~0U; // Silence any warnings about no return.
|
||
|
|
}
|
||
|
|
|
||
|
|
uint64_t PPCMCCodeEmitter::
|
||
|
|
getMachineOpValue(const MCInst &MI, const MCOperand &MO,
|
||
|
|
SmallVectorImpl<MCFixup> &Fixups,
|
||
|
|
const MCSubtargetInfo &STI) const {
|
||
|
|
if (MO.isReg()) {
|
||
|
|
// MTOCRF/MFOCRF should go through get_crbitm_encoding for the CR operand.
|
||
|
|
// The GPR operand should come through here though.
|
||
|
|
assert((MI.getOpcode() != PPC::MTOCRF && MI.getOpcode() != PPC::MTOCRF8 &&
|
||
|
|
MI.getOpcode() != PPC::MFOCRF && MI.getOpcode() != PPC::MFOCRF8) ||
|
||
|
|
MO.getReg() < PPC::CR0 || MO.getReg() > PPC::CR7);
|
||
|
|
unsigned OpNo = getOpIdxForMO(MI, MO);
|
||
|
|
unsigned Reg =
|
||
|
|
PPC::getRegNumForOperand(MCII.get(MI.getOpcode()), MO.getReg(), OpNo);
|
||
|
|
return CTX.getRegisterInfo()->getEncodingValue(Reg);
|
||
|
|
}
|
||
|
|
|
||
|
|
assert(MO.isImm() &&
|
||
|
|
"Relocation required in an instruction that we cannot encode!");
|
||
|
|
return MO.getImm();
|
||
|
|
}
|
||
|
|
|
||
|
|
void PPCMCCodeEmitter::encodeInstruction(const MCInst &MI,
|
||
|
|
SmallVectorImpl<char> &CB,
|
||
|
|
SmallVectorImpl<MCFixup> &Fixups,
|
||
|
|
const MCSubtargetInfo &STI) const {
|
||
|
|
uint64_t Bits = getBinaryCodeForInstr(MI, Fixups, STI);
|
||
|
|
|
||
|
|
// Output the constant in big/little endian byte order.
|
||
|
|
unsigned Size = getInstSizeInBytes(MI);
|
||
|
|
llvm::endianness E =
|
||
|
|
IsLittleEndian ? llvm::endianness::little : llvm::endianness::big;
|
||
|
|
switch (Size) {
|
||
|
|
case 0:
|
||
|
|
break;
|
||
|
|
case 4:
|
||
|
|
support::endian::write<uint32_t>(CB, Bits, E);
|
||
|
|
break;
|
||
|
|
case 8:
|
||
|
|
// If we emit a pair of instructions, the first one is
|
||
|
|
// always in the top 32 bits, even on little-endian.
|
||
|
|
support::endian::write<uint32_t>(CB, Bits >> 32, E);
|
||
|
|
support::endian::write<uint32_t>(CB, Bits, E);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
llvm_unreachable("Invalid instruction size");
|
||
|
|
}
|
||
|
|
|
||
|
|
++MCNumEmitted; // Keep track of the # of mi's emitted.
|
||
|
|
}
|
||
|
|
|
||
|
|
// Get the number of bytes used to encode the given MCInst.
|
||
|
|
unsigned PPCMCCodeEmitter::getInstSizeInBytes(const MCInst &MI) const {
|
||
|
|
unsigned Opcode = MI.getOpcode();
|
||
|
|
const MCInstrDesc &Desc = MCII.get(Opcode);
|
||
|
|
return Desc.getSize();
|
||
|
|
}
|
||
|
|
|
||
|
|
bool PPCMCCodeEmitter::isPrefixedInstruction(const MCInst &MI) const {
|
||
|
|
return MCII.get(MI.getOpcode()).TSFlags & PPCII::Prefixed;
|
||
|
|
}
|
||
|
|
|
||
|
|
#include "PPCGenMCCodeEmitter.inc"
|