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authorGabe Black <gblack@eecs.umich.edu>2006-10-15 21:04:14 -0400
committerGabe Black <gblack@eecs.umich.edu>2006-10-15 21:04:14 -0400
commit333a7c4ba27da0093d736b18c9355a214042fb01 (patch)
treee44d2fd2c6ec8fc3f07d06fc8576ac25c22c2189 /src/cpu
parentdc7d9af582a192f5a50fcbc72073e7aab1a57097 (diff)
downloadgem5-333a7c4ba27da0093d736b18c9355a214042fb01.tar.xz
Started implementing microcode.
--HG-- extra : convert_revision : 51df0454085e13df023efd8a0c0a12f9756c4690
Diffstat (limited to 'src/cpu')
-rw-r--r--src/cpu/simple/base.cc48
-rw-r--r--src/cpu/simple/base.hh1
-rw-r--r--src/cpu/simple_thread.hh20
-rw-r--r--src/cpu/thread_state.hh10
4 files changed, 69 insertions, 10 deletions
diff --git a/src/cpu/simple/base.cc b/src/cpu/simple/base.cc
index 0bbe92282..1d5c0a6f5 100644
--- a/src/cpu/simple/base.cc
+++ b/src/cpu/simple/base.cc
@@ -396,7 +396,18 @@ BaseSimpleCPU::preExecute()
// decode the instruction
inst = gtoh(inst);
- curStaticInst = StaticInst::decode(makeExtMI(inst, thread->getTC()));
+ //If we're not in the middle of a macro instruction
+ if (!curMacroStaticInst) {
+ StaticInstPtr instPtr = StaticInst::decode(makeExtMI(inst, thread->getTC()));
+ if (instPtr->isMacroOp()) {
+ curMacroStaticInst = instPtr;
+ curStaticInst = curMacroStaticInst->fetchMicroOp(0);
+ }
+ } else {
+ //Read the next micro op from the macro op
+ curStaticInst = curMacroStaticInst->fetchMicroOp(thread->readMicroPc());
+ }
+
traceData = Trace::getInstRecord(curTick, tc, curStaticInst,
thread->readPC());
@@ -446,18 +457,35 @@ BaseSimpleCPU::advancePC(Fault fault)
{
if (fault != NoFault) {
fault->invoke(tc);
- }
- else {
- // go to the next instruction
- thread->setPC(thread->readNextPC());
+ } else {
+ //If we're at the last micro op for this instruction
+ if (curStaticInst->isLastMicroOp()) {
+ //We should be working with a macro op
+ assert(curMacroStaticInst);
+ //Close out this macro op, and clean up the
+ //microcode state
+ curMacroStaticInst = nullStaticInst;
+ thread->setMicroPC(0);
+ thread->setNextMicroPC(0);
+ }
+ //If we're still in a macro op
+ if (curMacroStaticInst) {
+ //Advance the micro pc
+ thread->setMicroPC(thread->getNextMicroPC());
+ //Advance the "next" micro pc. Note that there are no delay
+ //slots, and micro ops are "word" addressed.
+ thread->setNextMicroPC(thread->getNextMicroPC() + 1);
+ } 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());
+ thread->setNextPC(thread->readNextNPC());
+ thread->setNextNPC(thread->readNextNPC() + sizeof(MachInst));
+ assert(thread->readNextPC() != thread->readNextNPC());
#else
- thread->setNextPC(thread->readNextPC() + sizeof(MachInst));
+ thread->setNextPC(thread->readNextPC() + sizeof(MachInst));
#endif
-
+ }
}
#if FULL_SYSTEM
diff --git a/src/cpu/simple/base.hh b/src/cpu/simple/base.hh
index 57cfa3c2c..af6b6f835 100644
--- a/src/cpu/simple/base.hh
+++ b/src/cpu/simple/base.hh
@@ -128,6 +128,7 @@ class BaseSimpleCPU : public BaseCPU
TheISA::IntReg dataReg;
StaticInstPtr curStaticInst;
+ StaticInstPtr curMacroStaticInst;
void checkForInterrupts();
Fault setupFetchRequest(Request *req);
diff --git a/src/cpu/simple_thread.hh b/src/cpu/simple_thread.hh
index 6fa6500bd..fe22e6c43 100644
--- a/src/cpu/simple_thread.hh
+++ b/src/cpu/simple_thread.hh
@@ -377,6 +377,16 @@ class SimpleThread : public ThreadState
regs.setPC(val);
}
+ uint64_t readMicroPC()
+ {
+ return microPC;
+ }
+
+ void setMicroPC(uint64_t val)
+ {
+ microPC = val;
+ }
+
uint64_t readNextPC()
{
return regs.readNextPC();
@@ -387,6 +397,16 @@ class SimpleThread : public ThreadState
regs.setNextPC(val);
}
+ uint64_t readNextMicroPC()
+ {
+ return nextMicroPC;
+ }
+
+ void setNextMicroPC(uint64_t val)
+ {
+ nextMicroPC = val;
+ }
+
uint64_t readNextNPC()
{
return regs.readNextNPC();
diff --git a/src/cpu/thread_state.hh b/src/cpu/thread_state.hh
index 14e033b7f..60353760c 100644
--- a/src/cpu/thread_state.hh
+++ b/src/cpu/thread_state.hh
@@ -200,6 +200,16 @@ struct ThreadState {
*/
TheISA::MachInst inst;
+ /** The current microcode pc for the currently executing macro
+ * operation.
+ */
+ MicroPC microPC;
+
+ /** The next microcode pc for the currently executing macro
+ * operation.
+ */
+ MicroPC nextMicroPC;
+
public:
/**
* Temporary storage to pass the source address from copy_load to