llvm-6502/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
Saleem Abdulrasool 2d0d7fd085 Add WoA object file emission support
Introduce support for WoA PE/COFF object file emission from LLVM.  Add the new
target specific PE/COFF Streamer (ARMWinCOFFStreamer) that handles the ARM
specific behaviour of PE/COFF object emission.  ARM exception information is not
yet emitted and is a TODO item.

The ARM specific object writer (ARMWinCOFFObjectWriter) handles the ARM specific
relocation handling in conjunction with the WinCOFFObjectWriter in the MC layer.
The MC layer needs to be updated to deal with the relocation adjustments.
Branch relocations are adjusted by 4 bytes (unlikely their ELF counterparts).

Minor tweaks to switch multiple conditional checks into equivalent switch
statements.  The ObjectFileInfo is updated to relax the object file setup for
Windows COFF.  Move the architecture checks into an assertion.  Windows COFF is
currently only supported on x86, x86_64, and ARM (thumb).  Rather than
defaulting to ELF, we will refuse to generate an object file.  This is better
though as you do not get an (arbitrary) object file which is different from the
request.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207345 91177308-0d34-0410-b5e6-96231b3b80d8
2014-04-27 03:48:22 +00:00

448 lines
17 KiB
C++

//===-- ARMMCTargetDesc.cpp - ARM Target Descriptions ---------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file provides ARM specific target descriptions.
//
//===----------------------------------------------------------------------===//
#include "ARMBaseInfo.h"
#include "ARMMCAsmInfo.h"
#include "ARMMCTargetDesc.h"
#include "InstPrinter/ARMInstPrinter.h"
#include "llvm/ADT/Triple.h"
#include "llvm/MC/MCCodeGenInfo.h"
#include "llvm/MC/MCELFStreamer.h"
#include "llvm/MC/MCInstrAnalysis.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/TargetRegistry.h"
using namespace llvm;
#define GET_REGINFO_MC_DESC
#include "ARMGenRegisterInfo.inc"
static bool getMCRDeprecationInfo(MCInst &MI, MCSubtargetInfo &STI,
std::string &Info) {
if (STI.getFeatureBits() & llvm::ARM::HasV7Ops &&
(MI.getOperand(0).isImm() && MI.getOperand(0).getImm() == 15) &&
(MI.getOperand(1).isImm() && MI.getOperand(1).getImm() == 0) &&
// Checks for the deprecated CP15ISB encoding:
// mcr p15, #0, rX, c7, c5, #4
(MI.getOperand(3).isImm() && MI.getOperand(3).getImm() == 7)) {
if ((MI.getOperand(5).isImm() && MI.getOperand(5).getImm() == 4)) {
if (MI.getOperand(4).isImm() && MI.getOperand(4).getImm() == 5) {
Info = "deprecated since v7, use 'isb'";
return true;
}
// Checks for the deprecated CP15DSB encoding:
// mcr p15, #0, rX, c7, c10, #4
if (MI.getOperand(4).isImm() && MI.getOperand(4).getImm() == 10) {
Info = "deprecated since v7, use 'dsb'";
return true;
}
}
// Checks for the deprecated CP15DMB encoding:
// mcr p15, #0, rX, c7, c10, #5
if (MI.getOperand(4).isImm() && MI.getOperand(4).getImm() == 10 &&
(MI.getOperand(5).isImm() && MI.getOperand(5).getImm() == 5)) {
Info = "deprecated since v7, use 'dmb'";
return true;
}
}
return false;
}
static bool getITDeprecationInfo(MCInst &MI, MCSubtargetInfo &STI,
std::string &Info) {
if (STI.getFeatureBits() & llvm::ARM::HasV8Ops &&
MI.getOperand(1).isImm() && MI.getOperand(1).getImm() != 8) {
Info = "applying IT instruction to more than one subsequent instruction is deprecated";
return true;
}
return false;
}
#define GET_INSTRINFO_MC_DESC
#include "ARMGenInstrInfo.inc"
#define GET_SUBTARGETINFO_MC_DESC
#include "ARMGenSubtargetInfo.inc"
std::string ARM_MC::ParseARMTriple(StringRef TT, StringRef CPU) {
Triple triple(TT);
// Set the boolean corresponding to the current target triple, or the default
// if one cannot be determined, to true.
unsigned Len = TT.size();
unsigned Idx = 0;
// FIXME: Enhance Triple helper class to extract ARM version.
bool isThumb = triple.getArch() == Triple::thumb ||
triple.getArch() == Triple::thumbeb;
if (Len >= 5 && TT.substr(0, 4) == "armv")
Idx = 4;
else if (Len >= 7 && TT.substr(0, 6) == "armebv")
Idx = 6;
else if (Len >= 7 && TT.substr(0, 6) == "thumbv")
Idx = 6;
else if (Len >= 9 && TT.substr(0, 8) == "thumbebv")
Idx = 8;
bool NoCPU = CPU == "generic" || CPU.empty();
std::string ARMArchFeature;
if (Idx) {
unsigned SubVer = TT[Idx];
if (SubVer == '8') {
if (NoCPU)
// v8a: FeatureDB, FeatureFPARMv8, FeatureNEON, FeatureDSPThumb2,
// FeatureMP, FeatureHWDiv, FeatureHWDivARM, FeatureTrustZone,
// FeatureT2XtPk, FeatureCrypto, FeatureCRC
ARMArchFeature = "+v8,+db,+fp-armv8,+neon,+t2dsp,+mp,+hwdiv,+hwdiv-arm,"
"+trustzone,+t2xtpk,+crypto,+crc";
else
// Use CPU to figure out the exact features
ARMArchFeature = "+v8";
} else if (SubVer == '7') {
if (Len >= Idx+2 && TT[Idx+1] == 'm') {
isThumb = true;
if (NoCPU)
// v7m: FeatureNoARM, FeatureDB, FeatureHWDiv, FeatureMClass
ARMArchFeature = "+v7,+noarm,+db,+hwdiv,+mclass";
else
// Use CPU to figure out the exact features.
ARMArchFeature = "+v7";
} else if (Len >= Idx+3 && TT[Idx+1] == 'e'&& TT[Idx+2] == 'm') {
if (NoCPU)
// v7em: FeatureNoARM, FeatureDB, FeatureHWDiv, FeatureDSPThumb2,
// FeatureT2XtPk, FeatureMClass
ARMArchFeature = "+v7,+noarm,+db,+hwdiv,+t2dsp,t2xtpk,+mclass";
else
// Use CPU to figure out the exact features.
ARMArchFeature = "+v7";
} else if (Len >= Idx+2 && TT[Idx+1] == 's') {
if (NoCPU)
// v7s: FeatureNEON, FeatureDB, FeatureDSPThumb2, FeatureHasRAS
// Swift
ARMArchFeature = "+v7,+swift,+neon,+db,+t2dsp,+ras";
else
// Use CPU to figure out the exact features.
ARMArchFeature = "+v7";
} else {
// v7 CPUs have lots of different feature sets. If no CPU is specified,
// then assume v7a (e.g. cortex-a8) feature set. Otherwise, return
// the "minimum" feature set and use CPU string to figure out the exact
// features.
if (NoCPU)
// v7a: FeatureNEON, FeatureDB, FeatureDSPThumb2, FeatureT2XtPk
ARMArchFeature = "+v7,+neon,+db,+t2dsp,+t2xtpk";
else
// Use CPU to figure out the exact features.
ARMArchFeature = "+v7";
}
} else if (SubVer == '6') {
if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == '2')
ARMArchFeature = "+v6t2";
else if (Len >= Idx+2 && TT[Idx+1] == 'm') {
isThumb = true;
if (NoCPU)
// v6m: FeatureNoARM, FeatureMClass
ARMArchFeature = "+v6m,+noarm,+mclass";
else
ARMArchFeature = "+v6";
} else
ARMArchFeature = "+v6";
} else if (SubVer == '5') {
if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == 'e')
ARMArchFeature = "+v5te";
else
ARMArchFeature = "+v5t";
} else if (SubVer == '4' && Len >= Idx+2 && TT[Idx+1] == 't')
ARMArchFeature = "+v4t";
}
if (isThumb) {
if (ARMArchFeature.empty())
ARMArchFeature = "+thumb-mode";
else
ARMArchFeature += ",+thumb-mode";
}
if (triple.isOSNaCl()) {
if (ARMArchFeature.empty())
ARMArchFeature = "+nacl-trap";
else
ARMArchFeature += ",+nacl-trap";
}
return ARMArchFeature;
}
MCSubtargetInfo *ARM_MC::createARMMCSubtargetInfo(StringRef TT, StringRef CPU,
StringRef FS) {
std::string ArchFS = ARM_MC::ParseARMTriple(TT, CPU);
if (!FS.empty()) {
if (!ArchFS.empty())
ArchFS = ArchFS + "," + FS.str();
else
ArchFS = FS;
}
MCSubtargetInfo *X = new MCSubtargetInfo();
InitARMMCSubtargetInfo(X, TT, CPU, ArchFS);
return X;
}
static MCInstrInfo *createARMMCInstrInfo() {
MCInstrInfo *X = new MCInstrInfo();
InitARMMCInstrInfo(X);
return X;
}
static MCRegisterInfo *createARMMCRegisterInfo(StringRef Triple) {
MCRegisterInfo *X = new MCRegisterInfo();
InitARMMCRegisterInfo(X, ARM::LR, 0, 0, ARM::PC);
return X;
}
static MCAsmInfo *createARMMCAsmInfo(const MCRegisterInfo &MRI, StringRef TT) {
Triple TheTriple(TT);
MCAsmInfo *MAI;
switch (TheTriple.getOS()) {
case llvm::Triple::Darwin:
case llvm::Triple::IOS:
case llvm::Triple::MacOSX:
MAI = new ARMMCAsmInfoDarwin(TT);
break;
case llvm::Triple::Win32:
switch (TheTriple.getEnvironment()) {
case llvm::Triple::Itanium:
MAI = new ARMCOFFMCAsmInfoGNU();
break;
case llvm::Triple::MSVC:
MAI = new ARMCOFFMCAsmInfoMicrosoft();
break;
default:
llvm_unreachable("invalid environment");
}
break;
default:
if (TheTriple.isOSBinFormatMachO())
MAI = new ARMMCAsmInfoDarwin(TT);
else
MAI = new ARMELFMCAsmInfo(TT);
break;
}
unsigned Reg = MRI.getDwarfRegNum(ARM::SP, true);
MAI->addInitialFrameState(MCCFIInstruction::createDefCfa(nullptr, Reg, 0));
return MAI;
}
static MCCodeGenInfo *createARMMCCodeGenInfo(StringRef TT, Reloc::Model RM,
CodeModel::Model CM,
CodeGenOpt::Level OL) {
MCCodeGenInfo *X = new MCCodeGenInfo();
if (RM == Reloc::Default) {
Triple TheTriple(TT);
// Default relocation model on Darwin is PIC, not DynamicNoPIC.
RM = TheTriple.isOSDarwin() ? Reloc::PIC_ : Reloc::DynamicNoPIC;
}
X->InitMCCodeGenInfo(RM, CM, OL);
return X;
}
// This is duplicated code. Refactor this.
static MCStreamer *createMCStreamer(const Target &T, StringRef TT,
MCContext &Ctx, MCAsmBackend &MAB,
raw_ostream &OS,
MCCodeEmitter *Emitter,
const MCSubtargetInfo &STI,
bool RelaxAll,
bool NoExecStack) {
Triple TheTriple(TT);
switch (TheTriple.getObjectFormat()) {
default: llvm_unreachable("unsupported object format");
case Triple::MachO: {
MCStreamer *S = createMachOStreamer(Ctx, MAB, OS, Emitter, false);
new ARMTargetStreamer(*S);
return S;
}
case Triple::COFF:
assert(TheTriple.isOSWindows() && "non-Windows ARM COFF is not supported");
return createARMWinCOFFStreamer(Ctx, MAB, *Emitter, OS);
case Triple::ELF:
return createARMELFStreamer(Ctx, MAB, OS, Emitter, false, NoExecStack,
TheTriple.getArch() == Triple::thumb);
}
}
static MCInstPrinter *createARMMCInstPrinter(const Target &T,
unsigned SyntaxVariant,
const MCAsmInfo &MAI,
const MCInstrInfo &MII,
const MCRegisterInfo &MRI,
const MCSubtargetInfo &STI) {
if (SyntaxVariant == 0)
return new ARMInstPrinter(MAI, MII, MRI, STI);
return nullptr;
}
static MCRelocationInfo *createARMMCRelocationInfo(StringRef TT,
MCContext &Ctx) {
Triple TheTriple(TT);
if (TheTriple.isOSBinFormatMachO())
return createARMMachORelocationInfo(Ctx);
// Default to the stock relocation info.
return llvm::createMCRelocationInfo(TT, Ctx);
}
namespace {
class ARMMCInstrAnalysis : public MCInstrAnalysis {
public:
ARMMCInstrAnalysis(const MCInstrInfo *Info) : MCInstrAnalysis(Info) {}
bool isUnconditionalBranch(const MCInst &Inst) const override {
// BCCs with the "always" predicate are unconditional branches.
if (Inst.getOpcode() == ARM::Bcc && Inst.getOperand(1).getImm()==ARMCC::AL)
return true;
return MCInstrAnalysis::isUnconditionalBranch(Inst);
}
bool isConditionalBranch(const MCInst &Inst) const override {
// BCCs with the "always" predicate are unconditional branches.
if (Inst.getOpcode() == ARM::Bcc && Inst.getOperand(1).getImm()==ARMCC::AL)
return false;
return MCInstrAnalysis::isConditionalBranch(Inst);
}
bool evaluateBranch(const MCInst &Inst, uint64_t Addr,
uint64_t Size, uint64_t &Target) const override {
// We only handle PCRel branches for now.
if (Info->get(Inst.getOpcode()).OpInfo[0].OperandType!=MCOI::OPERAND_PCREL)
return false;
int64_t Imm = Inst.getOperand(0).getImm();
// FIXME: This is not right for thumb.
Target = Addr+Imm+8; // In ARM mode the PC is always off by 8 bytes.
return true;
}
};
}
static MCInstrAnalysis *createARMMCInstrAnalysis(const MCInstrInfo *Info) {
return new ARMMCInstrAnalysis(Info);
}
// Force static initialization.
extern "C" void LLVMInitializeARMTargetMC() {
// Register the MC asm info.
RegisterMCAsmInfoFn X(TheARMLETarget, createARMMCAsmInfo);
RegisterMCAsmInfoFn Y(TheARMBETarget, createARMMCAsmInfo);
RegisterMCAsmInfoFn A(TheThumbLETarget, createARMMCAsmInfo);
RegisterMCAsmInfoFn B(TheThumbBETarget, createARMMCAsmInfo);
// Register the MC codegen info.
TargetRegistry::RegisterMCCodeGenInfo(TheARMLETarget, createARMMCCodeGenInfo);
TargetRegistry::RegisterMCCodeGenInfo(TheARMBETarget, createARMMCCodeGenInfo);
TargetRegistry::RegisterMCCodeGenInfo(TheThumbLETarget, createARMMCCodeGenInfo);
TargetRegistry::RegisterMCCodeGenInfo(TheThumbBETarget, createARMMCCodeGenInfo);
// Register the MC instruction info.
TargetRegistry::RegisterMCInstrInfo(TheARMLETarget, createARMMCInstrInfo);
TargetRegistry::RegisterMCInstrInfo(TheARMBETarget, createARMMCInstrInfo);
TargetRegistry::RegisterMCInstrInfo(TheThumbLETarget, createARMMCInstrInfo);
TargetRegistry::RegisterMCInstrInfo(TheThumbBETarget, createARMMCInstrInfo);
// Register the MC register info.
TargetRegistry::RegisterMCRegInfo(TheARMLETarget, createARMMCRegisterInfo);
TargetRegistry::RegisterMCRegInfo(TheARMBETarget, createARMMCRegisterInfo);
TargetRegistry::RegisterMCRegInfo(TheThumbLETarget, createARMMCRegisterInfo);
TargetRegistry::RegisterMCRegInfo(TheThumbBETarget, createARMMCRegisterInfo);
// Register the MC subtarget info.
TargetRegistry::RegisterMCSubtargetInfo(TheARMLETarget,
ARM_MC::createARMMCSubtargetInfo);
TargetRegistry::RegisterMCSubtargetInfo(TheARMBETarget,
ARM_MC::createARMMCSubtargetInfo);
TargetRegistry::RegisterMCSubtargetInfo(TheThumbLETarget,
ARM_MC::createARMMCSubtargetInfo);
TargetRegistry::RegisterMCSubtargetInfo(TheThumbBETarget,
ARM_MC::createARMMCSubtargetInfo);
// Register the MC instruction analyzer.
TargetRegistry::RegisterMCInstrAnalysis(TheARMLETarget,
createARMMCInstrAnalysis);
TargetRegistry::RegisterMCInstrAnalysis(TheARMBETarget,
createARMMCInstrAnalysis);
TargetRegistry::RegisterMCInstrAnalysis(TheThumbLETarget,
createARMMCInstrAnalysis);
TargetRegistry::RegisterMCInstrAnalysis(TheThumbBETarget,
createARMMCInstrAnalysis);
// Register the MC Code Emitter
TargetRegistry::RegisterMCCodeEmitter(TheARMLETarget,
createARMLEMCCodeEmitter);
TargetRegistry::RegisterMCCodeEmitter(TheARMBETarget,
createARMBEMCCodeEmitter);
TargetRegistry::RegisterMCCodeEmitter(TheThumbLETarget,
createARMLEMCCodeEmitter);
TargetRegistry::RegisterMCCodeEmitter(TheThumbBETarget,
createARMBEMCCodeEmitter);
// Register the asm backend.
TargetRegistry::RegisterMCAsmBackend(TheARMLETarget, createARMLEAsmBackend);
TargetRegistry::RegisterMCAsmBackend(TheARMBETarget, createARMBEAsmBackend);
TargetRegistry::RegisterMCAsmBackend(TheThumbLETarget,
createThumbLEAsmBackend);
TargetRegistry::RegisterMCAsmBackend(TheThumbBETarget,
createThumbBEAsmBackend);
// Register the object streamer.
TargetRegistry::RegisterMCObjectStreamer(TheARMLETarget, createMCStreamer);
TargetRegistry::RegisterMCObjectStreamer(TheARMBETarget, createMCStreamer);
TargetRegistry::RegisterMCObjectStreamer(TheThumbLETarget, createMCStreamer);
TargetRegistry::RegisterMCObjectStreamer(TheThumbBETarget, createMCStreamer);
// Register the asm streamer.
TargetRegistry::RegisterAsmStreamer(TheARMLETarget, createMCAsmStreamer);
TargetRegistry::RegisterAsmStreamer(TheARMBETarget, createMCAsmStreamer);
TargetRegistry::RegisterAsmStreamer(TheThumbLETarget, createMCAsmStreamer);
TargetRegistry::RegisterAsmStreamer(TheThumbBETarget, createMCAsmStreamer);
// Register the MCInstPrinter.
TargetRegistry::RegisterMCInstPrinter(TheARMLETarget, createARMMCInstPrinter);
TargetRegistry::RegisterMCInstPrinter(TheARMBETarget, createARMMCInstPrinter);
TargetRegistry::RegisterMCInstPrinter(TheThumbLETarget,
createARMMCInstPrinter);
TargetRegistry::RegisterMCInstPrinter(TheThumbBETarget,
createARMMCInstPrinter);
// Register the MC relocation info.
TargetRegistry::RegisterMCRelocationInfo(TheARMLETarget,
createARMMCRelocationInfo);
TargetRegistry::RegisterMCRelocationInfo(TheARMBETarget,
createARMMCRelocationInfo);
TargetRegistry::RegisterMCRelocationInfo(TheThumbLETarget,
createARMMCRelocationInfo);
TargetRegistry::RegisterMCRelocationInfo(TheThumbBETarget,
createARMMCRelocationInfo);
}