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238 lines
8.0 KiB
C++
238 lines
8.0 KiB
C++
//===-- PPCCodeEmitter.cpp - JIT Code Emitter for PowerPC32 -------*- C++ -*-=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the PowerPC 32-bit CodeEmitter and associated machinery to
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// JIT-compile bytecode to native PowerPC.
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//
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//===----------------------------------------------------------------------===//
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#include "PPCTargetMachine.h"
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#include "PPCRelocations.h"
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#include "PPC.h"
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#include "llvm/Module.h"
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#include "llvm/PassManager.h"
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#include "llvm/CodeGen/MachineCodeEmitter.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Target/TargetOptions.h"
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using namespace llvm;
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namespace {
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class VISIBILITY_HIDDEN PPCCodeEmitter : public MachineFunctionPass {
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TargetMachine &TM;
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MachineCodeEmitter &MCE;
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/// MovePCtoLROffset - When/if we see a MovePCtoLR instruction, we record
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/// its address in the function into this pointer.
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void *MovePCtoLROffset;
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/// getMachineOpValue - evaluates the MachineOperand of a given MachineInstr
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///
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int getMachineOpValue(MachineInstr &MI, MachineOperand &MO);
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public:
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static char ID;
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PPCCodeEmitter(TargetMachine &T, MachineCodeEmitter &M)
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: MachineFunctionPass((intptr_t)&ID), TM(T), MCE(M) {}
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const char *getPassName() const { return "PowerPC Machine Code Emitter"; }
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/// runOnMachineFunction - emits the given MachineFunction to memory
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///
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bool runOnMachineFunction(MachineFunction &MF);
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/// emitBasicBlock - emits the given MachineBasicBlock to memory
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///
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void emitBasicBlock(MachineBasicBlock &MBB);
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/// getValueBit - return the particular bit of Val
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///
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unsigned getValueBit(int64_t Val, unsigned bit) { return (Val >> bit) & 1; }
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/// getBinaryCodeForInstr - This function, generated by the
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/// CodeEmitterGenerator using TableGen, produces the binary encoding for
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/// machine instructions.
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///
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unsigned getBinaryCodeForInstr(MachineInstr &MI);
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};
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char PPCCodeEmitter::ID = 0;
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}
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/// createPPCCodeEmitterPass - Return a pass that emits the collected PPC code
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/// to the specified MCE object.
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FunctionPass *llvm::createPPCCodeEmitterPass(PPCTargetMachine &TM,
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MachineCodeEmitter &MCE) {
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return new PPCCodeEmitter(TM, MCE);
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}
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#ifdef __APPLE__
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extern "C" void sys_icache_invalidate(const void *Addr, size_t len);
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#endif
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bool PPCCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
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assert((MF.getTarget().getRelocationModel() != Reloc::Default ||
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MF.getTarget().getRelocationModel() != Reloc::Static) &&
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"JIT relocation model must be set to static or default!");
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do {
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MovePCtoLROffset = 0;
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MCE.startFunction(MF);
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for (MachineFunction::iterator BB = MF.begin(), E = MF.end(); BB != E; ++BB)
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emitBasicBlock(*BB);
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} while (MCE.finishFunction(MF));
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return false;
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}
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void PPCCodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) {
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MCE.StartMachineBasicBlock(&MBB);
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for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end(); I != E; ++I){
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MachineInstr &MI = *I;
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switch (MI.getOpcode()) {
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default:
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MCE.emitWordBE(getBinaryCodeForInstr(*I));
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break;
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case PPC::IMPLICIT_DEF_GPRC:
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case PPC::IMPLICIT_DEF_G8RC:
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case PPC::IMPLICIT_DEF_F8:
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case PPC::IMPLICIT_DEF_F4:
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case PPC::IMPLICIT_DEF_VRRC:
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break; // pseudo opcode, no side effects
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case PPC::MovePCtoLR:
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case PPC::MovePCtoLR8:
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assert(TM.getRelocationModel() == Reloc::PIC_);
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MovePCtoLROffset = (void*)MCE.getCurrentPCValue();
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MCE.emitWordBE(0x48000005); // bl 1
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break;
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}
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}
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}
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int PPCCodeEmitter::getMachineOpValue(MachineInstr &MI, MachineOperand &MO) {
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intptr_t rv = 0; // Return value; defaults to 0 for unhandled cases
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// or things that get fixed up later by the JIT.
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if (MO.isRegister()) {
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rv = PPCRegisterInfo::getRegisterNumbering(MO.getReg());
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// Special encoding for MTCRF and MFOCRF, which uses a bit mask for the
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// register, not the register number directly.
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if ((MI.getOpcode() == PPC::MTCRF || MI.getOpcode() == PPC::MFOCRF) &&
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(MO.getReg() >= PPC::CR0 && MO.getReg() <= PPC::CR7)) {
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rv = 0x80 >> rv;
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}
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} else if (MO.isImmediate()) {
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rv = MO.getImmedValue();
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} else if (MO.isGlobalAddress() || MO.isExternalSymbol() ||
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MO.isConstantPoolIndex() || MO.isJumpTableIndex()) {
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unsigned Reloc = 0;
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if (MI.getOpcode() == PPC::BL_Macho || MI.getOpcode() == PPC::BL8_Macho ||
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MI.getOpcode() == PPC::BL_ELF || MI.getOpcode() == PPC::BL8_ELF)
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Reloc = PPC::reloc_pcrel_bx;
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else {
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if (TM.getRelocationModel() == Reloc::PIC_) {
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assert(MovePCtoLROffset && "MovePCtoLR not seen yet?");
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}
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switch (MI.getOpcode()) {
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default: MI.dump(); assert(0 && "Unknown instruction for relocation!");
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case PPC::LIS:
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case PPC::LIS8:
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case PPC::ADDIS:
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case PPC::ADDIS8:
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Reloc = PPC::reloc_absolute_high; // Pointer to symbol
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break;
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case PPC::LI:
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case PPC::LI8:
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case PPC::LA:
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// Loads.
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case PPC::LBZ:
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case PPC::LBZ8:
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case PPC::LHA:
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case PPC::LHA8:
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case PPC::LHZ:
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case PPC::LHZ8:
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case PPC::LWZ:
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case PPC::LWZ8:
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case PPC::LFS:
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case PPC::LFD:
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// Stores.
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case PPC::STB:
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case PPC::STB8:
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case PPC::STH:
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case PPC::STH8:
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case PPC::STW:
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case PPC::STW8:
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case PPC::STFS:
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case PPC::STFD:
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Reloc = PPC::reloc_absolute_low;
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break;
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case PPC::LWA:
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case PPC::LD:
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case PPC::STD:
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case PPC::STD_32:
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Reloc = PPC::reloc_absolute_low_ix;
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break;
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}
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}
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MachineRelocation R;
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if (MO.isGlobalAddress()) {
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R = MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
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MO.getGlobal(), 0);
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} else if (MO.isExternalSymbol()) {
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R = MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
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Reloc, MO.getSymbolName(), 0);
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} else if (MO.isConstantPoolIndex()) {
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R = MachineRelocation::getConstPool(MCE.getCurrentPCOffset(),
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Reloc, MO.getConstantPoolIndex(), 0);
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} else {
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assert(MO.isJumpTableIndex());
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R = MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(),
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Reloc, MO.getJumpTableIndex(), 0);
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}
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// If in PIC mode, we need to encode the negated address of the
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// 'movepctolr' into the unrelocated field. After relocation, we'll have
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// &gv-&movepctolr-4 in the imm field. Once &movepctolr is added to the imm
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// field, we get &gv. This doesn't happen for branch relocations, which are
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// always implicitly pc relative.
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if (TM.getRelocationModel() == Reloc::PIC_ && Reloc != PPC::reloc_pcrel_bx){
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assert(MovePCtoLROffset && "MovePCtoLR not seen yet?");
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R.setConstantVal(-(intptr_t)MovePCtoLROffset - 4);
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}
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MCE.addRelocation(R);
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} else if (MO.isMachineBasicBlock()) {
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unsigned Reloc = 0;
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unsigned Opcode = MI.getOpcode();
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if (Opcode == PPC::B || Opcode == PPC::BL_Macho ||
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Opcode == PPC::BLA_Macho || Opcode == PPC::BL_ELF ||
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Opcode == PPC::BLA_ELF)
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Reloc = PPC::reloc_pcrel_bx;
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else // BCC instruction
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Reloc = PPC::reloc_pcrel_bcx;
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MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
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Reloc,
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MO.getMachineBasicBlock()));
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} else {
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cerr << "ERROR: Unknown type of MachineOperand: " << MO << "\n";
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abort();
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}
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return rv;
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}
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#include "PPCGenCodeEmitter.inc"
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