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+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
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#ifndef __ARCH_X86_PREDECODER_HH__
#define __ARCH_X86_PREDECODER_HH__
+#include <cassert>
+
+#include "arch/x86/regs/misc.hh"
#include "arch/x86/types.hh"
#include "base/bitfield.hh"
-#include "sim/host.hh"
+#include "base/misc.hh"
+#include "base/trace.hh"
+#include "base/types.hh"
+#include "debug/Predecoder.hh"
class ThreadContext;
MachInst fetchChunk;
//The pc of the start of fetchChunk
Addr basePC;
+ //The pc the current instruction started at
+ Addr origPC;
//The offset into fetchChunk of current processing
int offset;
//The extended machine instruction being generated
ExtMachInst emi;
+ HandyM5Reg m5Reg;
inline uint8_t getNextByte()
{
- return (fetchChunk >> (offset * 8)) & 0xff;
+ return ((uint8_t *)&fetchChunk)[offset];
}
void getImmediate(int &collected, uint64_t ¤t, int size)
toGet = toGet > remaining ? remaining : toGet;
//Shift the bytes we want to be all the way to the right
- uint64_t partialDisp = fetchChunk >> (offset * 8);
+ uint64_t partialImm = fetchChunk >> (offset * 8);
//Mask off what we don't want
- partialDisp &= mask(toGet * 8);
+ partialImm &= mask(toGet * 8);
//Shift it over to overlay with our displacement.
- partialDisp <<= (displacementCollected * 8);
+ partialImm <<= (immediateCollected * 8);
//Put it into our displacement
- current |= partialDisp;
+ current |= partialImm;
//Update how many bytes we've collected.
collected += toGet;
consumeBytes(toGet);
outOfBytes = true;
}
+ void doReset();
+
//State machine state
protected:
//Whether or not we're out of bytes
bool emiIsReady;
//The size of the displacement value
int displacementSize;
- int displacementCollected;
//The size of the immediate value
int immediateSize;
+ //This is how much of any immediate value we've gotten. This is used
+ //for both the actual immediate and the displacement.
int immediateCollected;
enum State {
+ ResetState,
PrefixState,
OpcodeState,
ModRMState,
public:
Predecoder(ThreadContext * _tc) :
- tc(_tc), basePC(0), offset(0),
+ tc(_tc), basePC(0), origPC(0), offset(0),
outOfBytes(true), emiIsReady(false),
- state(PrefixState)
- {}
+ state(ResetState)
+ {
+ emi.mode.mode = LongMode;
+ emi.mode.submode = SixtyFourBitMode;
+ m5Reg = 0;
+ }
+
+ void reset()
+ {
+ state = ResetState;
+ }
ThreadContext * getTC()
{
//Use this to give data to the predecoder. This should be used
//when there is control flow.
- void moreBytes(Addr currPC, Addr off, MachInst data)
+ void moreBytes(const PCState &pc, Addr fetchPC, MachInst data)
{
- basePC = currPC;
- offset = off;
+ DPRINTF(Predecoder, "Getting more bytes.\n");
+ basePC = fetchPC;
+ offset = (fetchPC >= pc.instAddr()) ? 0 : pc.instAddr() - fetchPC;
fetchChunk = data;
- assert(off < sizeof(MachInst));
outOfBytes = false;
process();
}
- //Use this to give data to the predecoder. This should be used
- //when instructions are executed in order.
- void moreBytes(MachInst machInst)
- {
- moreBytes(basePC + sizeof(machInst), 0, machInst);
- }
-
bool needMoreBytes()
{
return outOfBytes;
return emiIsReady;
}
+ int
+ getInstSize()
+ {
+ int size = basePC + offset - origPC;
+ DPRINTF(Predecoder,
+ "Calculating the instruction size: "
+ "basePC: %#x offset: %#x origPC: %#x size: %d\n",
+ basePC, offset, origPC, size);
+ return size;
+ }
+
//This returns a constant reference to the ExtMachInst to avoid a copy
- const ExtMachInst & getExtMachInst()
+ const ExtMachInst &
+ getExtMachInst(X86ISA::PCState &nextPC)
{
assert(emiIsReady);
emiIsReady = false;
+ if (!nextPC.size()) {
+ Addr size = getInstSize();
+ nextPC.size(size);
+ nextPC.npc(nextPC.pc() + size);
+ }
return emi;
}
};
projects / gem5.git / blobdiff