diff options
Diffstat (limited to 'src/cpu/simple/base.cc')
| -rw-r--r-- | src/cpu/simple/base.cc | 23 |
1 files changed, 12 insertions, 11 deletions
diff --git a/src/cpu/simple/base.cc b/src/cpu/simple/base.cc index c27be02bf..2ad328542 100644 --- a/src/cpu/simple/base.cc +++ b/src/cpu/simple/base.cc @@ -70,7 +70,7 @@ using namespace std; using namespace TheISA; BaseSimpleCPU::BaseSimpleCPU(Params *p) - : BaseCPU(p), thread(NULL) + : BaseCPU(p), thread(NULL), predecoder(NULL) { #if FULL_SYSTEM thread = new SimpleThread(this, 0, p->system, p->itb, p->dtb); @@ -370,11 +370,16 @@ BaseSimpleCPU::preExecute() StaticInstPtr instPtr = NULL; //Predecode, ie bundle up an ExtMachInst - unsigned int result = - predecode(extMachInst, thread->readPC(), inst, thread->getTC()); + //This should go away once the constructor can be set up properly + predecoder.setTC(thread->getTC()); + //If more fetch data is needed, pass it in. + if(predecoder.needMoreBytes()) + predecoder.moreBytes(thread->readPC(), 0, inst); + else + predecoder.process(); //If an instruction is ready, decode it - if (result & ExtMIReady) - instPtr = StaticInst::decode(extMachInst); + if (predecoder.extMachInstReady()) + instPtr = StaticInst::decode(predecoder.getExtMachInst()); //If we decoded an instruction and it's microcoded, start pulling //out micro ops @@ -446,9 +451,9 @@ BaseSimpleCPU::advancePC(Fault fault) fault->invoke(tc); thread->setMicroPC(0); thread->setNextMicroPC(1); - } else { + } else if (predecoder.needMoreBytes()) { //If we're at the last micro op for this instruction - if (curStaticInst->isLastMicroOp()) { + if (curStaticInst && curStaticInst->isLastMicroOp()) { //We should be working with a macro op assert(curMacroStaticInst); //Close out this macro op, and clean up the @@ -467,13 +472,9 @@ BaseSimpleCPU::advancePC(Fault fault) } else { // go to the next instruction thread->setPC(thread->readNextPC()); -#if ISA_HAS_DELAY_SLOT thread->setNextPC(thread->readNextNPC()); thread->setNextNPC(thread->readNextNPC() + sizeof(MachInst)); assert(thread->readNextPC() != thread->readNextNPC()); -#else - thread->setNextPC(thread->readNextPC() + sizeof(MachInst)); -#endif } } |