#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 "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"
#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/MCSection.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/ELF.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetOptions.h"
+#include <string>
using namespace llvm;
const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
.Initialize(OutContext, TM);
MipsFI = MF.getInfo<MipsFunctionInfo>();
+ 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;
}
void MipsAsmPrinter::EmitFunctionEntryLabel() {
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())
TS.emitDirectiveSetMicroMips();
- // leave out until FSF available gas has micromips changes
- // else
- // TS.emitDirectiveSetNoMicroMips();
+ else
+ TS.emitDirectiveSetNoMicroMips();
if (Subtarget->inMips16Mode())
TS.emitDirectiveSetMips16();
void MipsAsmPrinter::EmitStartOfAsmFile(Module &M) {
// 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();
+ bool IsABICalls = true;
+ if (IsABICalls) {
+ getTargetStreamer().emitDirectiveAbiCalls();
+ Reloc::Model RM = Subtarget->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 && !Subtarget->isABI_N64())
+ getTargetStreamer().emitDirectiveOptionPic0();
+ }
// Tell the assembler which ABI we are using
std::string SectionName = std::string(".mdebug.") + getCurrentABIString();
OutStreamer.SwitchSection(OutContext.getELFSection(
SectionName, ELF::SHT_PROGBITS, 0, SectionKind::getDataRel()));
+ // NaN: At the moment we only support:
+ // 1. .nan legacy (default)
+ // 2. .nan 2008
+ Subtarget->isNaN2008() ? getTargetStreamer().emitDirectiveNaN2008()
+ : getTargetStreamer().emitDirectiveNaNLegacy();
+
// TODO: handle O64 ABI
if (Subtarget->isABI_EABI()) {
OutContext.getELFSection(".gcc_compiled_long64", ELF::SHT_PROGBITS, 0,
SectionKind::getDataRel()));
}
+}
- // return to the text section
- OutStreamer.SwitchSection(OutContext.getObjectFileInfo()->getTextSection());
+void MipsAsmPrinter::EmitJal(MCSymbol *Symbol) {
+ MCInst I;
+ I.setOpcode(Mips::JAL);
+ I.addOperand(
+ MCOperand::CreateExpr(MCSymbolRefExpr::Create(Symbol, OutContext)));
+ OutStreamer.EmitInstruction(I, getSubtargetInfo());
+}
+
+void MipsAsmPrinter::EmitInstrReg(unsigned Opcode, unsigned Reg) {
+ MCInst I;
+ I.setOpcode(Opcode);
+ I.addOperand(MCOperand::CreateReg(Reg));
+ OutStreamer.EmitInstruction(I, getSubtargetInfo());
+}
+
+void MipsAsmPrinter::EmitInstrRegReg(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, getSubtargetInfo());
+}
+
+void MipsAsmPrinter::EmitInstrRegRegReg(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, getSubtargetInfo());
+}
+
+void MipsAsmPrinter::EmitMovFPIntPair(unsigned MovOpc, unsigned Reg1,
+ unsigned Reg2, unsigned FPReg1,
+ unsigned FPReg2, bool LE) {
+ if (!LE) {
+ unsigned temp = Reg1;
+ Reg1 = Reg2;
+ Reg2 = temp;
+ }
+ EmitInstrRegReg(MovOpc, Reg1, FPReg1);
+ EmitInstrRegReg(MovOpc, Reg2, FPReg2);
+}
+
+void MipsAsmPrinter::EmitSwapFPIntParams(Mips16HardFloatInfo::FPParamVariant PV,
+ bool LE, bool ToFP) {
+ using namespace Mips16HardFloatInfo;
+ unsigned MovOpc = ToFP ? Mips::MTC1 : Mips::MFC1;
+ switch (PV) {
+ case FSig:
+ EmitInstrRegReg(MovOpc, Mips::A0, Mips::F12);
+ break;
+ case FFSig:
+ EmitMovFPIntPair(MovOpc, Mips::A0, Mips::A1, Mips::F12, Mips::F14, LE);
+ break;
+ case FDSig:
+ EmitInstrRegReg(MovOpc, Mips::A0, Mips::F12);
+ EmitMovFPIntPair(MovOpc, Mips::A2, Mips::A3, Mips::F14, Mips::F15, LE);
+ break;
+ case DSig:
+ EmitMovFPIntPair(MovOpc, Mips::A0, Mips::A1, Mips::F12, Mips::F13, LE);
+ break;
+ case DDSig:
+ EmitMovFPIntPair(MovOpc, Mips::A0, Mips::A1, Mips::F12, Mips::F13, LE);
+ EmitMovFPIntPair(MovOpc, Mips::A2, Mips::A3, Mips::F14, Mips::F15, LE);
+ break;
+ case DFSig:
+ EmitMovFPIntPair(MovOpc, Mips::A0, Mips::A1, Mips::F12, Mips::F13, LE);
+ EmitInstrRegReg(MovOpc, Mips::A2, Mips::F14);
+ break;
+ case NoSig:
+ return;
+ }
+}
+
+void
+MipsAsmPrinter::EmitSwapFPIntRetval(Mips16HardFloatInfo::FPReturnVariant RV,
+ bool LE) {
+ using namespace Mips16HardFloatInfo;
+ unsigned MovOpc = Mips::MFC1;
+ switch (RV) {
+ case FRet:
+ EmitInstrRegReg(MovOpc, Mips::V0, Mips::F0);
+ break;
+ case DRet:
+ EmitMovFPIntPair(MovOpc, Mips::V0, Mips::V1, Mips::F0, Mips::F1, LE);
+ break;
+ case CFRet:
+ EmitMovFPIntPair(MovOpc, Mips::V0, Mips::V1, Mips::F0, Mips::F1, LE);
+ break;
+ case CDRet:
+ EmitMovFPIntPair(MovOpc, Mips::V0, Mips::V1, Mips::F0, Mips::F1, LE);
+ EmitMovFPIntPair(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 = Subtarget->isLittle();
+ //
+ // .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
+ //
+ const MCSectionELF *M = OutContext.getELFSection(
+ ".mips16.call.fp." + std::string(Symbol), ELF::SHT_PROGBITS,
+ ELF::SHF_ALLOC | ELF::SHF_EXECINSTR, SectionKind::getText());
+ OutStreamer.SwitchSection(M, 0);
+ //
+ // .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);
+ MCSymbol *Stub = 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);
+ //
+ // we just handle non pic for now. these function will not be
+ // called otherwise. when the full stub generation is moved here
+ // we need to deal with pic.
+ //
+ if (Subtarget->getRelocationModel() == Reloc::PIC_)
+ llvm_unreachable("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(Mips::ADDu, Mips::S2, Mips::RA, Mips::ZERO);
+
+ EmitSwapFPIntParams(Signature->ParamSig, LE, true);
+
+ // Jal xxxx
+ //
+ EmitJal(MSymbol);
+
+ // fix return values
+ EmitSwapFPIntRetval(Signature->RetSig, LE);
+ //
+ // do the return
+ // if (Signature->RetSig == NoFPRet)
+ // llvm_unreachable("should not be any stubs here with no return value");
+ // else
+ EmitInstrReg(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);
+ // 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,
// 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<MachineJumpTableEntry> &JT = JtInfo->getJumpTables();
+ for (unsigned I = 0; I < JT.size(); ++I) {
+ const std::vector<MachineBasicBlock*> &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);
+ }
+}
+
// Force static initialization.
extern "C" void LLVMInitializeMipsAsmPrinter() {
RegisterAsmPrinter<MipsAsmPrinter> X(TheMipsTarget);
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