354 lines
12 KiB
C++
354 lines
12 KiB
C++
//===-- ARMMCTargetDesc.cpp - ARM Target Descriptions ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides ARM specific target descriptions.
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//
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//===----------------------------------------------------------------------===//
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#include "ARMBaseInfo.h"
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#include "ARMMCAsmInfo.h"
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#include "ARMMCTargetDesc.h"
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#include "InstPrinter/ARMInstPrinter.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/MC/MCELFStreamer.h"
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#include "llvm/MC/MCInstrAnalysis.h"
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#include "llvm/MC/MCInstrInfo.h"
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#include "llvm/MC/MCRegisterInfo.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/TargetParser.h"
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#include "llvm/Support/TargetRegistry.h"
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using namespace llvm;
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#define GET_REGINFO_MC_DESC
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#include "ARMGenRegisterInfo.inc"
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static bool getMCRDeprecationInfo(MCInst &MI, const MCSubtargetInfo &STI,
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std::string &Info) {
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if (STI.getFeatureBits()[llvm::ARM::HasV7Ops] &&
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(MI.getOperand(0).isImm() && MI.getOperand(0).getImm() == 15) &&
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(MI.getOperand(1).isImm() && MI.getOperand(1).getImm() == 0) &&
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// Checks for the deprecated CP15ISB encoding:
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// mcr p15, #0, rX, c7, c5, #4
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(MI.getOperand(3).isImm() && MI.getOperand(3).getImm() == 7)) {
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if ((MI.getOperand(5).isImm() && MI.getOperand(5).getImm() == 4)) {
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if (MI.getOperand(4).isImm() && MI.getOperand(4).getImm() == 5) {
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Info = "deprecated since v7, use 'isb'";
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return true;
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}
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// Checks for the deprecated CP15DSB encoding:
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// mcr p15, #0, rX, c7, c10, #4
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if (MI.getOperand(4).isImm() && MI.getOperand(4).getImm() == 10) {
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Info = "deprecated since v7, use 'dsb'";
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return true;
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}
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}
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// Checks for the deprecated CP15DMB encoding:
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// mcr p15, #0, rX, c7, c10, #5
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if (MI.getOperand(4).isImm() && MI.getOperand(4).getImm() == 10 &&
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(MI.getOperand(5).isImm() && MI.getOperand(5).getImm() == 5)) {
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Info = "deprecated since v7, use 'dmb'";
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return true;
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}
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}
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return false;
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}
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static bool getITDeprecationInfo(MCInst &MI, const MCSubtargetInfo &STI,
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std::string &Info) {
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if (STI.getFeatureBits()[llvm::ARM::HasV8Ops] && MI.getOperand(1).isImm() &&
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MI.getOperand(1).getImm() != 8) {
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Info = "applying IT instruction to more than one subsequent instruction is "
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"deprecated";
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return true;
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}
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return false;
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}
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static bool getARMStoreDeprecationInfo(MCInst &MI, const MCSubtargetInfo &STI,
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std::string &Info) {
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assert(!STI.getFeatureBits()[llvm::ARM::ModeThumb] &&
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"cannot predicate thumb instructions");
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assert(MI.getNumOperands() >= 4 && "expected >= 4 arguments");
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for (unsigned OI = 4, OE = MI.getNumOperands(); OI < OE; ++OI) {
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assert(MI.getOperand(OI).isReg() && "expected register");
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if (MI.getOperand(OI).getReg() == ARM::SP ||
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MI.getOperand(OI).getReg() == ARM::PC) {
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Info = "use of SP or PC in the list is deprecated";
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return true;
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}
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}
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return false;
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}
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static bool getARMLoadDeprecationInfo(MCInst &MI, const MCSubtargetInfo &STI,
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std::string &Info) {
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assert(!STI.getFeatureBits()[llvm::ARM::ModeThumb] &&
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"cannot predicate thumb instructions");
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assert(MI.getNumOperands() >= 4 && "expected >= 4 arguments");
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bool ListContainsPC = false, ListContainsLR = false;
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for (unsigned OI = 4, OE = MI.getNumOperands(); OI < OE; ++OI) {
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assert(MI.getOperand(OI).isReg() && "expected register");
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switch (MI.getOperand(OI).getReg()) {
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default:
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break;
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case ARM::LR:
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ListContainsLR = true;
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break;
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case ARM::PC:
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ListContainsPC = true;
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break;
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case ARM::SP:
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Info = "use of SP in the list is deprecated";
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return true;
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}
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}
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if (ListContainsPC && ListContainsLR) {
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Info = "use of LR and PC simultaneously in the list is deprecated";
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return true;
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}
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return false;
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}
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#define GET_INSTRINFO_MC_DESC
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#include "ARMGenInstrInfo.inc"
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#define GET_SUBTARGETINFO_MC_DESC
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#include "ARMGenSubtargetInfo.inc"
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std::string ARM_MC::ParseARMTriple(const Triple &TT, StringRef CPU) {
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bool isThumb =
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TT.getArch() == Triple::thumb || TT.getArch() == Triple::thumbeb;
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std::string ARMArchFeature;
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unsigned ArchID = ARM::parseArch(TT.getArchName());
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if (ArchID != ARM::AK_INVALID && (CPU.empty() || CPU == "generic"))
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ARMArchFeature = (ARMArchFeature + "+" + ARM::getArchName(ArchID)).str();
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if (isThumb) {
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if (ARMArchFeature.empty())
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ARMArchFeature = "+thumb-mode";
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else
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ARMArchFeature += ",+thumb-mode";
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}
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if (TT.isOSNaCl()) {
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if (ARMArchFeature.empty())
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ARMArchFeature = "+nacl-trap";
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else
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ARMArchFeature += ",+nacl-trap";
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}
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return ARMArchFeature;
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}
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MCSubtargetInfo *ARM_MC::createARMMCSubtargetInfo(const Triple &TT,
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StringRef CPU, StringRef FS) {
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std::string ArchFS = ARM_MC::ParseARMTriple(TT, CPU);
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if (!FS.empty()) {
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if (!ArchFS.empty())
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ArchFS = (Twine(ArchFS) + "," + FS).str();
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else
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ArchFS = FS;
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}
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return createARMMCSubtargetInfoImpl(TT, CPU, ArchFS);
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}
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static MCInstrInfo *createARMMCInstrInfo() {
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MCInstrInfo *X = new MCInstrInfo();
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InitARMMCInstrInfo(X);
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return X;
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}
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static MCRegisterInfo *createARMMCRegisterInfo(const Triple &Triple) {
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MCRegisterInfo *X = new MCRegisterInfo();
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InitARMMCRegisterInfo(X, ARM::LR, 0, 0, ARM::PC);
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return X;
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}
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static MCAsmInfo *createARMMCAsmInfo(const MCRegisterInfo &MRI,
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const Triple &TheTriple) {
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MCAsmInfo *MAI;
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if (TheTriple.isOSDarwin() || TheTriple.isOSBinFormatMachO())
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MAI = new ARMMCAsmInfoDarwin(TheTriple);
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else if (TheTriple.isWindowsMSVCEnvironment())
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MAI = new ARMCOFFMCAsmInfoMicrosoft();
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else if (TheTriple.isOSWindows())
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MAI = new ARMCOFFMCAsmInfoGNU();
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else
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MAI = new ARMELFMCAsmInfo(TheTriple);
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unsigned Reg = MRI.getDwarfRegNum(ARM::SP, true);
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MAI->addInitialFrameState(MCCFIInstruction::createDefCfa(nullptr, Reg, 0));
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return MAI;
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}
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static MCStreamer *createELFStreamer(const Triple &T, MCContext &Ctx,
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MCAsmBackend &MAB, raw_pwrite_stream &OS,
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MCCodeEmitter *Emitter, bool RelaxAll) {
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return createARMELFStreamer(Ctx, MAB, OS, Emitter, false,
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(T.getArch() == Triple::thumb ||
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T.getArch() == Triple::thumbeb));
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}
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static MCStreamer *createARMMachOStreamer(MCContext &Ctx, MCAsmBackend &MAB,
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raw_pwrite_stream &OS,
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MCCodeEmitter *Emitter, bool RelaxAll,
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bool DWARFMustBeAtTheEnd) {
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return createMachOStreamer(Ctx, MAB, OS, Emitter, false, DWARFMustBeAtTheEnd);
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}
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static MCInstPrinter *createARMMCInstPrinter(const Triple &T,
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unsigned SyntaxVariant,
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const MCAsmInfo &MAI,
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const MCInstrInfo &MII,
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const MCRegisterInfo &MRI) {
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if (SyntaxVariant == 0)
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return new ARMInstPrinter(MAI, MII, MRI);
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return nullptr;
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}
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static MCRelocationInfo *createARMMCRelocationInfo(const Triple &TT,
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MCContext &Ctx) {
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if (TT.isOSBinFormatMachO())
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return createARMMachORelocationInfo(Ctx);
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// Default to the stock relocation info.
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return llvm::createMCRelocationInfo(TT, Ctx);
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}
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namespace {
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class ARMMCInstrAnalysis : public MCInstrAnalysis {
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public:
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ARMMCInstrAnalysis(const MCInstrInfo *Info) : MCInstrAnalysis(Info) {}
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bool isUnconditionalBranch(const MCInst &Inst) const override {
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// BCCs with the "always" predicate are unconditional branches.
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if (Inst.getOpcode() == ARM::Bcc && Inst.getOperand(1).getImm()==ARMCC::AL)
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return true;
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return MCInstrAnalysis::isUnconditionalBranch(Inst);
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}
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bool isConditionalBranch(const MCInst &Inst) const override {
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// BCCs with the "always" predicate are unconditional branches.
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if (Inst.getOpcode() == ARM::Bcc && Inst.getOperand(1).getImm()==ARMCC::AL)
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return false;
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return MCInstrAnalysis::isConditionalBranch(Inst);
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}
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bool evaluateBranch(const MCInst &Inst, uint64_t Addr,
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uint64_t Size, uint64_t &Target) const override {
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// We only handle PCRel branches for now.
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if (Info->get(Inst.getOpcode()).OpInfo[0].OperandType!=MCOI::OPERAND_PCREL)
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return false;
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int64_t Imm = Inst.getOperand(0).getImm();
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Target = Addr+Imm+8; // In ARM mode the PC is always off by 8 bytes.
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return true;
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}
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};
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class ThumbMCInstrAnalysis : public ARMMCInstrAnalysis {
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public:
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ThumbMCInstrAnalysis(const MCInstrInfo *Info) : ARMMCInstrAnalysis(Info) {}
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bool evaluateBranch(const MCInst &Inst, uint64_t Addr,
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uint64_t Size, uint64_t &Target) const override {
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// We only handle PCRel branches for now.
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if (Info->get(Inst.getOpcode()).OpInfo[0].OperandType!=MCOI::OPERAND_PCREL)
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return false;
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int64_t Imm = Inst.getOperand(0).getImm();
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Target = Addr+Imm+4; // In Thumb mode the PC is always off by 4 bytes.
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return true;
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}
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};
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}
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static MCInstrAnalysis *createARMMCInstrAnalysis(const MCInstrInfo *Info) {
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return new ARMMCInstrAnalysis(Info);
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}
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static MCInstrAnalysis *createThumbMCInstrAnalysis(const MCInstrInfo *Info) {
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return new ThumbMCInstrAnalysis(Info);
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}
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// Force static initialization.
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extern "C" void LLVMInitializeARMTargetMC() {
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for (Target *T : {&getTheARMLETarget(), &getTheARMBETarget(),
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&getTheThumbLETarget(), &getTheThumbBETarget()}) {
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// Register the MC asm info.
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RegisterMCAsmInfoFn X(*T, createARMMCAsmInfo);
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// Register the MC instruction info.
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TargetRegistry::RegisterMCInstrInfo(*T, createARMMCInstrInfo);
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// Register the MC register info.
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TargetRegistry::RegisterMCRegInfo(*T, createARMMCRegisterInfo);
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// Register the MC subtarget info.
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TargetRegistry::RegisterMCSubtargetInfo(*T,
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ARM_MC::createARMMCSubtargetInfo);
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TargetRegistry::RegisterELFStreamer(*T, createELFStreamer);
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TargetRegistry::RegisterCOFFStreamer(*T, createARMWinCOFFStreamer);
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TargetRegistry::RegisterMachOStreamer(*T, createARMMachOStreamer);
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// Register the obj target streamer.
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TargetRegistry::RegisterObjectTargetStreamer(*T,
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createARMObjectTargetStreamer);
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// Register the asm streamer.
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TargetRegistry::RegisterAsmTargetStreamer(*T, createARMTargetAsmStreamer);
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// Register the null TargetStreamer.
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TargetRegistry::RegisterNullTargetStreamer(*T, createARMNullTargetStreamer);
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// Register the MCInstPrinter.
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TargetRegistry::RegisterMCInstPrinter(*T, createARMMCInstPrinter);
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// Register the MC relocation info.
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TargetRegistry::RegisterMCRelocationInfo(*T, createARMMCRelocationInfo);
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}
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// Register the MC instruction analyzer.
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for (Target *T : {&getTheARMLETarget(), &getTheARMBETarget()})
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TargetRegistry::RegisterMCInstrAnalysis(*T, createARMMCInstrAnalysis);
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for (Target *T : {&getTheThumbLETarget(), &getTheThumbBETarget()})
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TargetRegistry::RegisterMCInstrAnalysis(*T, createThumbMCInstrAnalysis);
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// Register the MC Code Emitter
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for (Target *T : {&getTheARMLETarget(), &getTheThumbLETarget()})
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TargetRegistry::RegisterMCCodeEmitter(*T, createARMLEMCCodeEmitter);
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for (Target *T : {&getTheARMBETarget(), &getTheThumbBETarget()})
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TargetRegistry::RegisterMCCodeEmitter(*T, createARMBEMCCodeEmitter);
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// Register the asm backend.
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TargetRegistry::RegisterMCAsmBackend(getTheARMLETarget(),
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createARMLEAsmBackend);
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TargetRegistry::RegisterMCAsmBackend(getTheARMBETarget(),
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createARMBEAsmBackend);
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TargetRegistry::RegisterMCAsmBackend(getTheThumbLETarget(),
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createThumbLEAsmBackend);
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TargetRegistry::RegisterMCAsmBackend(getTheThumbBETarget(),
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createThumbBEAsmBackend);
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}
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