X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FTarget%2FMips%2FMipsAsmPrinter.cpp;h=c2e176c2c6a265c596c37fafd134ce8114952709;hb=c315a08fee1f92099d0a320231a97836060cf90f;hp=54ee30b2960c99d527431b46e767f36ac551c325;hpb=b56c57bcbb8b87dca05a18c284155fa75285470b;p=oota-llvm.git diff --git a/lib/Target/Mips/MipsAsmPrinter.cpp b/lib/Target/Mips/MipsAsmPrinter.cpp index 54ee30b2960..c2e176c2c6a 100644 --- a/lib/Target/Mips/MipsAsmPrinter.cpp +++ b/lib/Target/Mips/MipsAsmPrinter.cpp @@ -12,21 +12,22 @@ // //===----------------------------------------------------------------------===// -#define DEBUG_TYPE "mips-asm-printer" #include "InstPrinter/MipsInstPrinter.h" #include "MCTargetDesc/MipsBaseInfo.h" +#include "MCTargetDesc/MipsMCNaCl.h" #include "Mips.h" #include "MipsAsmPrinter.h" #include "MipsInstrInfo.h" #include "MipsMCInstLower.h" +#include "MipsTargetMachine.h" #include "MipsTargetStreamer.h" #include "llvm/ADT/SmallString.h" -#include "llvm/ADT/StringExtras.h" #include "llvm/ADT/Twine.h" #include "llvm/CodeGen/MachineConstantPool.h" #include "llvm/CodeGen/MachineFrameInfo.h" #include "llvm/CodeGen/MachineFunctionPass.h" #include "llvm/CodeGen/MachineInstr.h" +#include "llvm/CodeGen/MachineJumpTableInfo.h" #include "llvm/CodeGen/MachineMemOperand.h" #include "llvm/IR/BasicBlock.h" #include "llvm/IR/DataLayout.h" @@ -34,28 +35,53 @@ #include "llvm/IR/Instructions.h" #include "llvm/IR/Mangler.h" #include "llvm/MC/MCAsmInfo.h" +#include "llvm/MC/MCContext.h" #include "llvm/MC/MCELFStreamer.h" +#include "llvm/MC/MCExpr.h" #include "llvm/MC/MCInst.h" -#include "llvm/MC/MCSymbol.h" +#include "llvm/MC/MCSection.h" +#include "llvm/MC/MCSectionELF.h" +#include "llvm/MC/MCSymbolELF.h" #include "llvm/Support/ELF.h" #include "llvm/Support/TargetRegistry.h" #include "llvm/Support/raw_ostream.h" #include "llvm/Target/TargetLoweringObjectFile.h" #include "llvm/Target/TargetOptions.h" +#include using namespace llvm; -MipsTargetStreamer &MipsAsmPrinter::getTargetStreamer() { - return static_cast(OutStreamer.getTargetStreamer()); +#define DEBUG_TYPE "mips-asm-printer" + +MipsTargetStreamer &MipsAsmPrinter::getTargetStreamer() const { + return static_cast(*OutStreamer->getTargetStreamer()); } bool MipsAsmPrinter::runOnMachineFunction(MachineFunction &MF) { + Subtarget = &MF.getSubtarget(); + // Initialize TargetLoweringObjectFile. - if (Subtarget->allowMixed16_32()) - const_cast(getObjFileLowering()) + const_cast(getObjFileLowering()) .Initialize(OutContext, TM); + MipsFI = MF.getInfo(); + if (Subtarget->inMips16Mode()) + for (std::map< + const char *, + const llvm::Mips16HardFloatInfo::FuncSignature *>::const_iterator + it = MipsFI->StubsNeeded.begin(); + it != MipsFI->StubsNeeded.end(); ++it) { + const char *Symbol = it->first; + const llvm::Mips16HardFloatInfo::FuncSignature *Signature = it->second; + if (StubsNeeded.find(Symbol) == StubsNeeded.end()) + StubsNeeded[Symbol] = Signature; + } MCP = MF.getConstantPool(); + + // In NaCl, all indirect jump targets must be aligned to bundle size. + if (Subtarget->isTargetNaCl()) + NaClAlignIndirectJumpTargets(MF); + AsmPrinter::runOnMachineFunction(MF); return true; } @@ -67,7 +93,46 @@ bool MipsAsmPrinter::lowerOperand(const MachineOperand &MO, MCOperand &MCOp) { #include "MipsGenMCPseudoLowering.inc" +// Lower PseudoReturn/PseudoIndirectBranch/PseudoIndirectBranch64 to JR, JR_MM, +// JALR, or JALR64 as appropriate for the target +void MipsAsmPrinter::emitPseudoIndirectBranch(MCStreamer &OutStreamer, + const MachineInstr *MI) { + bool HasLinkReg = false; + MCInst TmpInst0; + + if (Subtarget->hasMips64r6()) { + // MIPS64r6 should use (JALR64 ZERO_64, $rs) + TmpInst0.setOpcode(Mips::JALR64); + HasLinkReg = true; + } else if (Subtarget->hasMips32r6()) { + // MIPS32r6 should use (JALR ZERO, $rs) + TmpInst0.setOpcode(Mips::JALR); + HasLinkReg = true; + } else if (Subtarget->inMicroMipsMode()) + // microMIPS should use (JR_MM $rs) + TmpInst0.setOpcode(Mips::JR_MM); + else { + // Everything else should use (JR $rs) + TmpInst0.setOpcode(Mips::JR); + } + + MCOperand MCOp; + + if (HasLinkReg) { + unsigned ZeroReg = Subtarget->isGP64bit() ? Mips::ZERO_64 : Mips::ZERO; + TmpInst0.addOperand(MCOperand::createReg(ZeroReg)); + } + + lowerOperand(MI->getOperand(0), MCOp); + TmpInst0.addOperand(MCOp); + + EmitToStreamer(OutStreamer, TmpInst0); +} + void MipsAsmPrinter::EmitInstruction(const MachineInstr *MI) { + MipsTargetStreamer &TS = getTargetStreamer(); + TS.forbidModuleDirective(); + if (MI->isDebugValue()) { SmallString<128> Str; raw_svector_ostream OS(Str); @@ -78,7 +143,7 @@ void MipsAsmPrinter::EmitInstruction(const MachineInstr *MI) { // If we just ended a constant pool, mark it as such. if (InConstantPool && MI->getOpcode() != Mips::CONSTPOOL_ENTRY) { - OutStreamer.EmitDataRegion(MCDR_DataRegionEnd); + OutStreamer->EmitDataRegion(MCDR_DataRegionEnd); InConstantPool = false; } if (MI->getOpcode() == Mips::CONSTPOOL_ENTRY) { @@ -94,17 +159,17 @@ void MipsAsmPrinter::EmitInstruction(const MachineInstr *MI) { // If this is the first entry of the pool, mark it. if (!InConstantPool) { - OutStreamer.EmitDataRegion(MCDR_DataRegion); + OutStreamer->EmitDataRegion(MCDR_DataRegion); InConstantPool = true; } - OutStreamer.EmitLabel(GetCPISymbol(LabelId)); + OutStreamer->EmitLabel(GetCPISymbol(LabelId)); const MachineConstantPoolEntry &MCPE = MCP->getConstants()[CPIdx]; if (MCPE.isMachineConstantPoolEntry()) EmitMachineConstantPoolValue(MCPE.Val.MachineCPVal); else - EmitGlobalConstant(MCPE.Val.ConstVal); + EmitGlobalConstant(MF->getDataLayout(), MCPE.Val.ConstVal); return; } @@ -114,8 +179,16 @@ void MipsAsmPrinter::EmitInstruction(const MachineInstr *MI) { do { // Do any auto-generated pseudo lowerings. - if (emitPseudoExpansionLowering(OutStreamer, &*I)) + if (emitPseudoExpansionLowering(*OutStreamer, &*I)) + continue; + + if (I->getOpcode() == Mips::PseudoReturn || + I->getOpcode() == Mips::PseudoReturn64 || + I->getOpcode() == Mips::PseudoIndirectBranch || + I->getOpcode() == Mips::PseudoIndirectBranch64) { + emitPseudoIndirectBranch(*OutStreamer, &*I); continue; + } // The inMips16Mode() test is not permanent. // Some instructions are marked as pseudo right now which @@ -124,12 +197,13 @@ void MipsAsmPrinter::EmitInstruction(const MachineInstr *MI) { // removing another test for this situation downstream in the // callchain. // - if (I->isPseudo() && !Subtarget->inMips16Mode()) + if (I->isPseudo() && !Subtarget->inMips16Mode() + && !isLongBranchPseudo(I->getOpcode())) llvm_unreachable("Pseudo opcode found in EmitInstruction()"); MCInst TmpInst0; MCInstLowering.Lower(I, TmpInst0); - OutStreamer.EmitInstruction(TmpInst0); + EmitToStreamer(*OutStreamer, TmpInst0); } while ((++I != E) && I->isInsideBundle()); // Delay slot check } @@ -170,13 +244,14 @@ void MipsAsmPrinter::EmitInstruction(const MachineInstr *MI) { // Create a bitmask with all callee saved registers for CPU or Floating Point // registers. For CPU registers consider RA, GP and FP for saving if necessary. -void MipsAsmPrinter::printSavedRegsBitmask(raw_ostream &O) { +void MipsAsmPrinter::printSavedRegsBitmask() { // CPU and FPU Saved Registers Bitmasks unsigned CPUBitmask = 0, FPUBitmask = 0; int CPUTopSavedRegOff, FPUTopSavedRegOff; // Set the CPU and FPU Bitmasks const MachineFrameInfo *MFI = MF->getFrameInfo(); + const TargetRegisterInfo *TRI = MF->getSubtarget().getRegisterInfo(); const std::vector &CSI = MFI->getCalleeSavedInfo(); // size of stack area to which FP callee-saved regs are saved. unsigned CPURegSize = Mips::GPR32RegClass.getSize(); @@ -184,31 +259,22 @@ void MipsAsmPrinter::printSavedRegsBitmask(raw_ostream &O) { unsigned AFGR64RegSize = Mips::AFGR64RegClass.getSize(); bool HasAFGR64Reg = false; unsigned CSFPRegsSize = 0; - unsigned i, e = CSI.size(); - // Set FPU Bitmask. - for (i = 0; i != e; ++i) { - unsigned Reg = CSI[i].getReg(); - if (Mips::GPR32RegClass.contains(Reg)) - break; + for (const auto &I : CSI) { + unsigned Reg = I.getReg(); + unsigned RegNum = TRI->getEncodingValue(Reg); - unsigned RegNum = TM.getRegisterInfo()->getEncodingValue(Reg); - if (Mips::AFGR64RegClass.contains(Reg)) { + // If it's a floating point register, set the FPU Bitmask. + // If it's a general purpose register, set the CPU Bitmask. + if (Mips::FGR32RegClass.contains(Reg)) { + FPUBitmask |= (1 << RegNum); + CSFPRegsSize += FGR32RegSize; + } else if (Mips::AFGR64RegClass.contains(Reg)) { FPUBitmask |= (3 << RegNum); CSFPRegsSize += AFGR64RegSize; HasAFGR64Reg = true; - continue; - } - - FPUBitmask |= (1 << RegNum); - CSFPRegsSize += FGR32RegSize; - } - - // Set CPU Bitmask. - for (; i != e; ++i) { - unsigned Reg = CSI[i].getReg(); - unsigned RegNum = TM.getRegisterInfo()->getEncodingValue(Reg); - CPUBitmask |= (1 << RegNum); + } else if (Mips::GPR32RegClass.contains(Reg)) + CPUBitmask |= (1 << RegNum); } // FP Regs are saved right below where the virtual frame pointer points to. @@ -218,20 +284,12 @@ void MipsAsmPrinter::printSavedRegsBitmask(raw_ostream &O) { // CPU Regs are saved below FP Regs. CPUTopSavedRegOff = CPUBitmask ? -CSFPRegsSize - CPURegSize : 0; + MipsTargetStreamer &TS = getTargetStreamer(); // Print CPUBitmask - O << "\t.mask \t"; printHex32(CPUBitmask, O); - O << ',' << CPUTopSavedRegOff << '\n'; + TS.emitMask(CPUBitmask, CPUTopSavedRegOff); // Print FPUBitmask - O << "\t.fmask\t"; printHex32(FPUBitmask, O); - O << "," << FPUTopSavedRegOff << '\n'; -} - -// Print a 32 bit hex number with all numbers. -void MipsAsmPrinter::printHex32(unsigned Value, raw_ostream &O) { - O << "0x"; - for (int i = 7; i >= 0; i--) - O.write_hex((Value & (0xF << (i*4))) >> (i*4)); + TS.emitFMask(FPUBitmask, FPUTopSavedRegOff); } //===----------------------------------------------------------------------===// @@ -240,93 +298,95 @@ void MipsAsmPrinter::printHex32(unsigned Value, raw_ostream &O) { /// Frame Directive void MipsAsmPrinter::emitFrameDirective() { - const TargetRegisterInfo &RI = *TM.getRegisterInfo(); + const TargetRegisterInfo &RI = *MF->getSubtarget().getRegisterInfo(); unsigned stackReg = RI.getFrameRegister(*MF); unsigned returnReg = RI.getRARegister(); unsigned stackSize = MF->getFrameInfo()->getStackSize(); - if (OutStreamer.hasRawTextSupport()) - OutStreamer.EmitRawText("\t.frame\t$" + - StringRef(MipsInstPrinter::getRegisterName(stackReg)).lower() + - "," + Twine(stackSize) + ",$" + - StringRef(MipsInstPrinter::getRegisterName(returnReg)).lower()); + getTargetStreamer().emitFrame(stackReg, stackSize, returnReg); } /// Emit Set directives. const char *MipsAsmPrinter::getCurrentABIString() const { - switch (Subtarget->getTargetABI()) { - case MipsSubtarget::O32: return "abi32"; - case MipsSubtarget::N32: return "abiN32"; - case MipsSubtarget::N64: return "abi64"; - case MipsSubtarget::EABI: return "eabi32"; // TODO: handle eabi64 + switch (static_cast(TM).getABI().GetEnumValue()) { + case MipsABIInfo::ABI::O32: return "abi32"; + case MipsABIInfo::ABI::N32: return "abiN32"; + case MipsABIInfo::ABI::N64: return "abi64"; + case MipsABIInfo::ABI::EABI: return "eabi32"; // TODO: handle eabi64 default: llvm_unreachable("Unknown Mips ABI"); } } void MipsAsmPrinter::EmitFunctionEntryLabel() { - if (OutStreamer.hasRawTextSupport()) { - if (Subtarget->inMips16Mode()) - OutStreamer.EmitRawText(StringRef("\t.set\tmips16")); - else - OutStreamer.EmitRawText(StringRef("\t.set\tnomips16")); - // leave out until FSF available gas has micromips changes - // OutStreamer.EmitRawText(StringRef("\t.set\tnomicromips")); - OutStreamer.EmitRawText("\t.ent\t" + Twine(CurrentFnSym->getName())); - } + MipsTargetStreamer &TS = getTargetStreamer(); + + // NaCl sandboxing requires that indirect call instructions are masked. + // This means that function entry points should be bundle-aligned. + if (Subtarget->isTargetNaCl()) + EmitAlignment(std::max(MF->getAlignment(), MIPS_NACL_BUNDLE_ALIGN)); if (Subtarget->inMicroMipsMode()) - getTargetStreamer().emitMipsHackSTOCG(CurrentFnSym, - (unsigned)ELF::STO_MIPS_MICROMIPS); - OutStreamer.EmitLabel(CurrentFnSym); + TS.emitDirectiveSetMicroMips(); + else + TS.emitDirectiveSetNoMicroMips(); + + if (Subtarget->inMips16Mode()) + TS.emitDirectiveSetMips16(); + else + TS.emitDirectiveSetNoMips16(); + + TS.emitDirectiveEnt(*CurrentFnSym); + OutStreamer->EmitLabel(CurrentFnSym); } /// EmitFunctionBodyStart - Targets can override this to emit stuff before /// the first basic block in the function. void MipsAsmPrinter::EmitFunctionBodyStart() { + MipsTargetStreamer &TS = getTargetStreamer(); + MCInstLowering.Initialize(&MF->getContext()); - bool IsNakedFunction = - MF->getFunction()-> - getAttributes().hasAttribute(AttributeSet::FunctionIndex, - Attribute::Naked); + bool IsNakedFunction = MF->getFunction()->hasFnAttribute(Attribute::Naked); if (!IsNakedFunction) emitFrameDirective(); - if (OutStreamer.hasRawTextSupport()) { - SmallString<128> Str; - raw_svector_ostream OS(Str); - if (!IsNakedFunction) - printSavedRegsBitmask(OS); - OutStreamer.EmitRawText(OS.str()); - if (!Subtarget->inMips16Mode()) { - OutStreamer.EmitRawText(StringRef("\t.set\tnoreorder")); - OutStreamer.EmitRawText(StringRef("\t.set\tnomacro")); - OutStreamer.EmitRawText(StringRef("\t.set\tnoat")); - } + if (!IsNakedFunction) + printSavedRegsBitmask(); + + if (!Subtarget->inMips16Mode()) { + TS.emitDirectiveSetNoReorder(); + TS.emitDirectiveSetNoMacro(); + TS.emitDirectiveSetNoAt(); } } /// EmitFunctionBodyEnd - Targets can override this to emit stuff after /// the last basic block in the function. void MipsAsmPrinter::EmitFunctionBodyEnd() { + MipsTargetStreamer &TS = getTargetStreamer(); + // There are instruction for this macros, but they must // always be at the function end, and we can't emit and // break with BB logic. - if (OutStreamer.hasRawTextSupport()) { - if (!Subtarget->inMips16Mode()) { - OutStreamer.EmitRawText(StringRef("\t.set\tat")); - OutStreamer.EmitRawText(StringRef("\t.set\tmacro")); - OutStreamer.EmitRawText(StringRef("\t.set\treorder")); - } - OutStreamer.EmitRawText("\t.end\t" + Twine(CurrentFnSym->getName())); + if (!Subtarget->inMips16Mode()) { + TS.emitDirectiveSetAt(); + TS.emitDirectiveSetMacro(); + TS.emitDirectiveSetReorder(); } + TS.emitDirectiveEnd(CurrentFnSym->getName()); // Make sure to terminate any constant pools that were at the end // of the function. if (!InConstantPool) return; InConstantPool = false; - OutStreamer.EmitDataRegion(MCDR_DataRegionEnd); + OutStreamer->EmitDataRegion(MCDR_DataRegionEnd); +} + +void MipsAsmPrinter::EmitBasicBlockEnd(const MachineBasicBlock &MBB) { + MipsTargetStreamer &TS = getTargetStreamer(); + if (MBB.size() == 0) + TS.emitDirectiveInsn(); } /// isBlockOnlyReachableByFallthough - Return true if the basic block has @@ -345,7 +405,7 @@ bool MipsAsmPrinter::isBlockOnlyReachableByFallthrough(const MachineBasicBlock* // If this is a landing pad, it isn't a fall through. If it has no preds, // then nothing falls through to it. - if (MBB->isLandingPad() || MBB->pred_empty()) + if (MBB->isEHPad() || MBB->pred_empty()) return false; // If there isn't exactly one predecessor, it can't be a fall through. @@ -373,7 +433,7 @@ bool MipsAsmPrinter::isBlockOnlyReachableByFallthrough(const MachineBasicBlock* // Print out an operand for an inline asm expression. bool MipsAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNum, - unsigned AsmVariant,const char *ExtraCode, + unsigned AsmVariant, const char *ExtraCode, raw_ostream &O) { // Does this asm operand have a single letter operand modifier? if (ExtraCode && ExtraCode[0]) { @@ -387,12 +447,12 @@ bool MipsAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNum, case 'X': // hex const int if ((MO.getType()) != MachineOperand::MO_Immediate) return true; - O << "0x" << StringRef(utohexstr(MO.getImm())).lower(); + O << "0x" << Twine::utohexstr(MO.getImm()); return false; case 'x': // hex const int (low 16 bits) if ((MO.getType()) != MachineOperand::MO_Immediate) return true; - O << "0x" << StringRef(utohexstr(MO.getImm() & 0xffff)).lower(); + O << "0x" << Twine::utohexstr(MO.getImm() & 0xffff); return false; case 'd': // decimal const int if ((MO.getType()) != MachineOperand::MO_Immediate) @@ -406,14 +466,12 @@ bool MipsAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNum, return false; case 'z': { // $0 if zero, regular printing otherwise - if (MO.getType() != MachineOperand::MO_Immediate) - return true; - int64_t Val = MO.getImm(); - if (Val) - O << Val; - else + if (MO.getType() == MachineOperand::MO_Immediate && MO.getImm() == 0) { O << "$0"; - return false; + return false; + } + // If not, call printOperand as normal. + break; } case 'D': // Second part of a double word register operand case 'L': // Low order register of a double word register operand @@ -477,25 +535,30 @@ bool MipsAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum, unsigned AsmVariant, const char *ExtraCode, raw_ostream &O) { - int Offset = 0; + assert(OpNum + 1 < MI->getNumOperands() && "Insufficient operands"); + const MachineOperand &BaseMO = MI->getOperand(OpNum); + const MachineOperand &OffsetMO = MI->getOperand(OpNum + 1); + assert(BaseMO.isReg() && "Unexpected base pointer for inline asm memory operand."); + assert(OffsetMO.isImm() && "Unexpected offset for inline asm memory operand."); + int Offset = OffsetMO.getImm(); + // Currently we are expecting either no ExtraCode or 'D' if (ExtraCode) { if (ExtraCode[0] == 'D') - Offset = 4; + Offset += 4; else return true; // Unknown modifier. + // FIXME: M = high order bits + // FIXME: L = low order bits } - const MachineOperand &MO = MI->getOperand(OpNum); - assert(MO.isReg() && "unexpected inline asm memory operand"); - O << Offset << "($" << MipsInstPrinter::getRegisterName(MO.getReg()) << ")"; + O << Offset << "($" << MipsInstPrinter::getRegisterName(BaseMO.getReg()) << ")"; return false; } void MipsAsmPrinter::printOperand(const MachineInstr *MI, int opNum, raw_ostream &O) { - const DataLayout *DL = TM.getDataLayout(); const MachineOperand &MO = MI->getOperand(opNum); bool closeP = false; @@ -530,11 +593,11 @@ void MipsAsmPrinter::printOperand(const MachineInstr *MI, int opNum, break; case MachineOperand::MO_MachineBasicBlock: - O << *MO.getMBB()->getSymbol(); + MO.getMBB()->getSymbol()->print(O, MAI); return; case MachineOperand::MO_GlobalAddress: - O << *getSymbol(MO.getGlobal()); + getSymbol(MO.getGlobal())->print(O, MAI); break; case MachineOperand::MO_BlockAddress: { @@ -544,7 +607,7 @@ void MipsAsmPrinter::printOperand(const MachineInstr *MI, int opNum, } case MachineOperand::MO_ConstantPoolIndex: - O << DL->getPrivateGlobalPrefix() << "CPI" + O << getDataLayout().getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_" << MO.getIndex(); if (MO.getOffset()) O << "+" << MO.getOffset(); @@ -580,6 +643,18 @@ printMemOperand(const MachineInstr *MI, int opNum, raw_ostream &O) { // Load/Store memory operands -- imm($reg) // If PIC target the target is loaded as the // pattern lw $25,%call16($28) + + // opNum can be invalid if instruction has 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: + opNum = MI->getNumOperands() - 2; + break; + } + printOperand(MI, opNum+1, O); O << "("; printOperand(MI, opNum, O); @@ -603,85 +678,377 @@ printFCCOperand(const MachineInstr *MI, int opNum, raw_ostream &O, O << Mips::MipsFCCToString((Mips::CondCode)MO.getImm()); } +void MipsAsmPrinter:: +printRegisterList(const MachineInstr *MI, int opNum, raw_ostream &O) { + for (int i = opNum, e = MI->getNumOperands(); i != e; ++i) { + if (i != opNum) O << ", "; + printOperand(MI, i, O); + } +} + void MipsAsmPrinter::EmitStartOfAsmFile(Module &M) { - // FIXME: Use SwitchSection. - // TODO: Need to add -mabicalls and -mno-abicalls flags. - // Currently we assume that -mabicalls is the default. - getTargetStreamer().emitDirectiveAbiCalls(); - Reloc::Model RM = Subtarget->getRelocationModel(); - if (RM == Reloc::Static && !Subtarget->hasMips64()) - getTargetStreamer().emitDirectiveOptionPic0(); + // Compute MIPS architecture attributes based on the default subtarget + // that we'd have constructed. Module level directives aren't LTO + // clean anyhow. + // FIXME: For ifunc related functions we could iterate over and look + // for a feature string that doesn't match the default one. + const Triple &TT = TM.getTargetTriple(); + StringRef CPU = MIPS_MC::selectMipsCPU(TT, TM.getTargetCPU()); + StringRef FS = TM.getTargetFeatureString(); + const MipsTargetMachine &MTM = static_cast(TM); + const MipsSubtarget STI(TT, CPU, FS, MTM.isLittleEndian(), MTM); + + bool IsABICalls = STI.isABICalls(); + const MipsABIInfo &ABI = MTM.getABI(); + if (IsABICalls) { + getTargetStreamer().emitDirectiveAbiCalls(); + Reloc::Model RM = TM.getRelocationModel(); + // FIXME: This condition should be a lot more complicated that it is here. + // Ideally it should test for properties of the ABI and not the ABI + // itself. + // For the moment, I'm only correcting enough to make MIPS-IV work. + if (RM == Reloc::Static && !ABI.IsN64()) + getTargetStreamer().emitDirectiveOptionPic0(); + } // Tell the assembler which ABI we are using - if (OutStreamer.hasRawTextSupport()) - OutStreamer.EmitRawText("\t.section .mdebug." + - Twine(getCurrentABIString())); + std::string SectionName = std::string(".mdebug.") + getCurrentABIString(); + OutStreamer->SwitchSection( + OutContext.getELFSection(SectionName, ELF::SHT_PROGBITS, 0)); + + // NaN: At the moment we only support: + // 1. .nan legacy (default) + // 2. .nan 2008 + STI.isNaN2008() ? getTargetStreamer().emitDirectiveNaN2008() + : getTargetStreamer().emitDirectiveNaNLegacy(); // TODO: handle O64 ABI - if (OutStreamer.hasRawTextSupport()) { - if (Subtarget->isABI_EABI()) { - if (Subtarget->isGP32bit()) - OutStreamer.EmitRawText(StringRef("\t.section .gcc_compiled_long32")); - else - OutStreamer.EmitRawText(StringRef("\t.section .gcc_compiled_long64")); - } + + if (ABI.IsEABI()) { + if (STI.isGP32bit()) + OutStreamer->SwitchSection(OutContext.getELFSection(".gcc_compiled_long32", + ELF::SHT_PROGBITS, 0)); + else + OutStreamer->SwitchSection(OutContext.getELFSection(".gcc_compiled_long64", + ELF::SHT_PROGBITS, 0)); } - // return to previous section - if (OutStreamer.hasRawTextSupport()) - OutStreamer.EmitRawText(StringRef("\t.previous")); + getTargetStreamer().updateABIInfo(STI); + // We should always emit a '.module fp=...' but binutils 2.24 does not accept + // it. We therefore emit it when it contradicts the ABI defaults (-mfpxx or + // -mfp64) and omit it otherwise. + if (ABI.IsO32() && (STI.isABI_FPXX() || STI.isFP64bit())) + getTargetStreamer().emitDirectiveModuleFP(); + + // We should always emit a '.module [no]oddspreg' but binutils 2.24 does not + // accept it. We therefore emit it when it contradicts the default or an + // option has changed the default (i.e. FPXX) and omit it otherwise. + if (ABI.IsO32() && (!STI.useOddSPReg() || STI.isABI_FPXX())) + getTargetStreamer().emitDirectiveModuleOddSPReg(); } -static void emitELFHeaderFlagsCG(MipsTargetStreamer &TargetStreamer, - const MipsSubtarget &Subtarget) { - // Update e_header flags - unsigned EFlags = 0; +void MipsAsmPrinter::emitInlineAsmStart() const { + MipsTargetStreamer &TS = getTargetStreamer(); + + // GCC's choice of assembler options for inline assembly code ('at', 'macro' + // and 'reorder') is different from LLVM's choice for generated code ('noat', + // 'nomacro' and 'noreorder'). + // In order to maintain compatibility with inline assembly code which depends + // on GCC's assembler options being used, we have to switch to those options + // for the duration of the inline assembly block and then switch back. + TS.emitDirectiveSetPush(); + TS.emitDirectiveSetAt(); + TS.emitDirectiveSetMacro(); + TS.emitDirectiveSetReorder(); + OutStreamer->AddBlankLine(); +} - // TODO: Need to add -mabicalls and -mno-abicalls flags. - // Currently we assume that -mabicalls is the default. - EFlags |= ELF::EF_MIPS_CPIC; +void MipsAsmPrinter::emitInlineAsmEnd(const MCSubtargetInfo &StartInfo, + const MCSubtargetInfo *EndInfo) const { + OutStreamer->AddBlankLine(); + getTargetStreamer().emitDirectiveSetPop(); +} - if (Subtarget.inMips16Mode()) - EFlags |= ELF::EF_MIPS_ARCH_ASE_M16; - else - EFlags |= ELF::EF_MIPS_NOREORDER; - - // Architecture - if (Subtarget.hasMips64r2()) - EFlags |= ELF::EF_MIPS_ARCH_64R2; - else if (Subtarget.hasMips64()) - EFlags |= ELF::EF_MIPS_ARCH_64; - else if (Subtarget.hasMips32r2()) - EFlags |= ELF::EF_MIPS_ARCH_32R2; - else - EFlags |= ELF::EF_MIPS_ARCH_32; +void MipsAsmPrinter::EmitJal(const MCSubtargetInfo &STI, MCSymbol *Symbol) { + MCInst I; + I.setOpcode(Mips::JAL); + I.addOperand( + MCOperand::createExpr(MCSymbolRefExpr::create(Symbol, OutContext))); + OutStreamer->EmitInstruction(I, STI); +} - if (Subtarget.inMicroMipsMode()) - EFlags |= ELF::EF_MIPS_MICROMIPS; +void MipsAsmPrinter::EmitInstrReg(const MCSubtargetInfo &STI, unsigned Opcode, + unsigned Reg) { + MCInst I; + I.setOpcode(Opcode); + I.addOperand(MCOperand::createReg(Reg)); + OutStreamer->EmitInstruction(I, STI); +} - // ABI - if (Subtarget.isABI_O32()) - EFlags |= ELF::EF_MIPS_ABI_O32; +void MipsAsmPrinter::EmitInstrRegReg(const MCSubtargetInfo &STI, + unsigned Opcode, unsigned Reg1, + unsigned Reg2) { + MCInst I; + // + // Because of the current td files for Mips32, the operands for MTC1 + // appear backwards from their normal assembly order. It's not a trivial + // change to fix this in the td file so we adjust for it here. + // + if (Opcode == Mips::MTC1) { + unsigned Temp = Reg1; + Reg1 = Reg2; + Reg2 = Temp; + } + I.setOpcode(Opcode); + I.addOperand(MCOperand::createReg(Reg1)); + I.addOperand(MCOperand::createReg(Reg2)); + OutStreamer->EmitInstruction(I, STI); +} - // Relocation Model - Reloc::Model RM = Subtarget.getRelocationModel(); - if (RM == Reloc::PIC_ || RM == Reloc::Default) - EFlags |= ELF::EF_MIPS_PIC; - else if (RM == Reloc::Static) - ; // Do nothing for Reloc::Static - else - llvm_unreachable("Unsupported relocation model for e_flags"); +void MipsAsmPrinter::EmitInstrRegRegReg(const MCSubtargetInfo &STI, + unsigned Opcode, unsigned Reg1, + unsigned Reg2, unsigned Reg3) { + MCInst I; + I.setOpcode(Opcode); + I.addOperand(MCOperand::createReg(Reg1)); + I.addOperand(MCOperand::createReg(Reg2)); + I.addOperand(MCOperand::createReg(Reg3)); + OutStreamer->EmitInstruction(I, STI); +} + +void MipsAsmPrinter::EmitMovFPIntPair(const MCSubtargetInfo &STI, + unsigned MovOpc, unsigned Reg1, + unsigned Reg2, unsigned FPReg1, + unsigned FPReg2, bool LE) { + if (!LE) { + unsigned temp = Reg1; + Reg1 = Reg2; + Reg2 = temp; + } + EmitInstrRegReg(STI, MovOpc, Reg1, FPReg1); + EmitInstrRegReg(STI, MovOpc, Reg2, FPReg2); +} + +void MipsAsmPrinter::EmitSwapFPIntParams(const MCSubtargetInfo &STI, + Mips16HardFloatInfo::FPParamVariant PV, + bool LE, bool ToFP) { + using namespace Mips16HardFloatInfo; + unsigned MovOpc = ToFP ? Mips::MTC1 : Mips::MFC1; + switch (PV) { + case FSig: + EmitInstrRegReg(STI, MovOpc, Mips::A0, Mips::F12); + break; + case FFSig: + EmitMovFPIntPair(STI, MovOpc, Mips::A0, Mips::A1, Mips::F12, Mips::F14, LE); + break; + case FDSig: + EmitInstrRegReg(STI, MovOpc, Mips::A0, Mips::F12); + EmitMovFPIntPair(STI, MovOpc, Mips::A2, Mips::A3, Mips::F14, Mips::F15, LE); + break; + case DSig: + EmitMovFPIntPair(STI, MovOpc, Mips::A0, Mips::A1, Mips::F12, Mips::F13, LE); + break; + case DDSig: + EmitMovFPIntPair(STI, MovOpc, Mips::A0, Mips::A1, Mips::F12, Mips::F13, LE); + EmitMovFPIntPair(STI, MovOpc, Mips::A2, Mips::A3, Mips::F14, Mips::F15, LE); + break; + case DFSig: + EmitMovFPIntPair(STI, MovOpc, Mips::A0, Mips::A1, Mips::F12, Mips::F13, LE); + EmitInstrRegReg(STI, MovOpc, Mips::A2, Mips::F14); + break; + case NoSig: + return; + } +} - TargetStreamer.emitMipsHackELFFlags(EFlags); +void MipsAsmPrinter::EmitSwapFPIntRetval( + const MCSubtargetInfo &STI, Mips16HardFloatInfo::FPReturnVariant RV, + bool LE) { + using namespace Mips16HardFloatInfo; + unsigned MovOpc = Mips::MFC1; + switch (RV) { + case FRet: + EmitInstrRegReg(STI, MovOpc, Mips::V0, Mips::F0); + break; + case DRet: + EmitMovFPIntPair(STI, MovOpc, Mips::V0, Mips::V1, Mips::F0, Mips::F1, LE); + break; + case CFRet: + EmitMovFPIntPair(STI, MovOpc, Mips::V0, Mips::V1, Mips::F0, Mips::F1, LE); + break; + case CDRet: + EmitMovFPIntPair(STI, MovOpc, Mips::V0, Mips::V1, Mips::F0, Mips::F1, LE); + EmitMovFPIntPair(STI, MovOpc, Mips::A0, Mips::A1, Mips::F2, Mips::F3, LE); + break; + case NoFPRet: + break; + } +} + +void MipsAsmPrinter::EmitFPCallStub( + const char *Symbol, const Mips16HardFloatInfo::FuncSignature *Signature) { + MCSymbol *MSymbol = OutContext.getOrCreateSymbol(StringRef(Symbol)); + using namespace Mips16HardFloatInfo; + bool LE = getDataLayout().isLittleEndian(); + // Construct a local MCSubtargetInfo here. + // This is because the MachineFunction won't exist (but have not yet been + // freed) and since we're at the global level we can use the default + // constructed subtarget. + std::unique_ptr STI(TM.getTarget().createMCSubtargetInfo( + TM.getTargetTriple().str(), TM.getTargetCPU(), + TM.getTargetFeatureString())); + + // + // .global xxxx + // + OutStreamer->EmitSymbolAttribute(MSymbol, MCSA_Global); + const char *RetType; + // + // make the comment field identifying the return and parameter + // types of the floating point stub + // # Stub function to call rettype xxxx (params) + // + switch (Signature->RetSig) { + case FRet: + RetType = "float"; + break; + case DRet: + RetType = "double"; + break; + case CFRet: + RetType = "complex"; + break; + case CDRet: + RetType = "double complex"; + break; + case NoFPRet: + RetType = ""; + break; + } + const char *Parms; + switch (Signature->ParamSig) { + case FSig: + Parms = "float"; + break; + case FFSig: + Parms = "float, float"; + break; + case FDSig: + Parms = "float, double"; + break; + case DSig: + Parms = "double"; + break; + case DDSig: + Parms = "double, double"; + break; + case DFSig: + Parms = "double, float"; + break; + case NoSig: + Parms = ""; + break; + } + OutStreamer->AddComment("\t# Stub function to call " + Twine(RetType) + " " + + Twine(Symbol) + " (" + Twine(Parms) + ")"); + // + // probably not necessary but we save and restore the current section state + // + OutStreamer->PushSection(); + // + // .section mips16.call.fpxxxx,"ax",@progbits + // + MCSectionELF *M = OutContext.getELFSection( + ".mips16.call.fp." + std::string(Symbol), ELF::SHT_PROGBITS, + ELF::SHF_ALLOC | ELF::SHF_EXECINSTR); + OutStreamer->SwitchSection(M, nullptr); + // + // .align 2 + // + OutStreamer->EmitValueToAlignment(4); + MipsTargetStreamer &TS = getTargetStreamer(); + // + // .set nomips16 + // .set nomicromips + // + TS.emitDirectiveSetNoMips16(); + TS.emitDirectiveSetNoMicroMips(); + // + // .ent __call_stub_fp_xxxx + // .type __call_stub_fp_xxxx,@function + // __call_stub_fp_xxxx: + // + std::string x = "__call_stub_fp_" + std::string(Symbol); + MCSymbolELF *Stub = + cast(OutContext.getOrCreateSymbol(StringRef(x))); + TS.emitDirectiveEnt(*Stub); + MCSymbol *MType = + OutContext.getOrCreateSymbol("__call_stub_fp_" + Twine(Symbol)); + OutStreamer->EmitSymbolAttribute(MType, MCSA_ELF_TypeFunction); + OutStreamer->EmitLabel(Stub); + + // Only handle non-pic for now. + assert(TM.getRelocationModel() != Reloc::PIC_ && + "should not be here if we are compiling pic"); + TS.emitDirectiveSetReorder(); + // + // We need to add a MipsMCExpr class to MCTargetDesc to fully implement + // stubs without raw text but this current patch is for compiler generated + // functions and they all return some value. + // The calling sequence for non pic is different in that case and we need + // to implement %lo and %hi in order to handle the case of no return value + // See the corresponding method in Mips16HardFloat for details. + // + // mov the return address to S2. + // we have no stack space to store it and we are about to make another call. + // We need to make sure that the enclosing function knows to save S2 + // This should have already been handled. + // + // Mov $18, $31 + + EmitInstrRegRegReg(*STI, Mips::OR, Mips::S2, Mips::RA, Mips::ZERO); + + EmitSwapFPIntParams(*STI, Signature->ParamSig, LE, true); + + // Jal xxxx + // + EmitJal(*STI, MSymbol); + + // fix return values + EmitSwapFPIntRetval(*STI, Signature->RetSig, LE); + // + // do the return + // if (Signature->RetSig == NoFPRet) + // llvm_unreachable("should not be any stubs here with no return value"); + // else + EmitInstrReg(*STI, Mips::JR, Mips::S2); + + MCSymbol *Tmp = OutContext.createTempSymbol(); + OutStreamer->EmitLabel(Tmp); + const MCSymbolRefExpr *E = MCSymbolRefExpr::create(Stub, OutContext); + const MCSymbolRefExpr *T = MCSymbolRefExpr::create(Tmp, OutContext); + const MCExpr *T_min_E = MCBinaryExpr::createSub(T, E, OutContext); + OutStreamer->emitELFSize(Stub, T_min_E); + TS.emitDirectiveEnd(x); + OutStreamer->PopSection(); } void MipsAsmPrinter::EmitEndOfAsmFile(Module &M) { - // Emit Mips ELF register info - Subtarget->getMReginfo().emitMipsReginfoSectionCG( - OutStreamer, getObjFileLowering(), *Subtarget); - emitELFHeaderFlagsCG(getTargetStreamer(), *Subtarget); + // Emit needed stubs + // + for (std::map< + const char *, + const llvm::Mips16HardFloatInfo::FuncSignature *>::const_iterator + it = StubsNeeded.begin(); + it != StubsNeeded.end(); ++it) { + const char *Symbol = it->first; + const llvm::Mips16HardFloatInfo::FuncSignature *Signature = it->second; + EmitFPCallStub(Symbol, Signature); + } + // return to the text section + OutStreamer->SwitchSection(OutContext.getObjectFileInfo()->getTextSection()); } void MipsAsmPrinter::PrintDebugValueComment(const MachineInstr *MI, @@ -689,6 +1056,34 @@ void MipsAsmPrinter::PrintDebugValueComment(const MachineInstr *MI, // TODO: implement } +// Align all targets of indirect branches on bundle size. Used only if target +// is NaCl. +void MipsAsmPrinter::NaClAlignIndirectJumpTargets(MachineFunction &MF) { + // Align all blocks that are jumped to through jump table. + if (MachineJumpTableInfo *JtInfo = MF.getJumpTableInfo()) { + const std::vector &JT = JtInfo->getJumpTables(); + for (unsigned I = 0; I < JT.size(); ++I) { + const std::vector &MBBs = JT[I].MBBs; + + for (unsigned J = 0; J < MBBs.size(); ++J) + MBBs[J]->setAlignment(MIPS_NACL_BUNDLE_ALIGN); + } + } + + // If basic block address is taken, block can be target of indirect branch. + for (MachineFunction::iterator MBB = MF.begin(), E = MF.end(); + MBB != E; ++MBB) { + if (MBB->hasAddressTaken()) + MBB->setAlignment(MIPS_NACL_BUNDLE_ALIGN); + } +} + +bool MipsAsmPrinter::isLongBranchPseudo(int Opcode) const { + return (Opcode == Mips::LONG_BRANCH_LUi + || Opcode == Mips::LONG_BRANCH_ADDiu + || Opcode == Mips::LONG_BRANCH_DADDiu); +} + // Force static initialization. extern "C" void LLVMInitializeMipsAsmPrinter() { RegisterAsmPrinter X(TheMipsTarget);