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writebackStage.c
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writebackStage.c
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#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include "forwarding.h"
#include "status.h"
#include "bubbling.h"
#include "writebackStage.h"
#include "tools.h"
#include "instructions.h"
#include "executeStage.h"
#include "decodeStage.h"
#include "registers.h"
#include "dump.h"
static wregister W;
/* getWregister - gets the w register
*
* Returns: copy of the W register
*/
wregister getWregister()
{
return W;
}
/*
* clearWregister - clears Wregister
*/
void clearWregister()
{
clearBuffer((char *) &W, sizeof(W));
W.stat = SAOK;
W.icode = NOP;
}
/*
* writebackStage - determines when the pipeline should stop executing.
* also handles dump instructions
*
* Returns: TRUE when pipeline should stop
*/
bool writebackStage(forwardType * forward, statusType* status)
{
forward->W_dstE = W.dstE;
forward->W_valE = W.valE;
forward->W_dstM = W.dstM;
forward->W_valM = W.valM;
forward->W_icode = W.icode;
status->W_stat = W.stat;
if(W.stat == SAOK)
{
setRegister(W.dstE, W.valE);
setRegister(W.dstM, W.valM);
}
if(W.stat == SINS)
{
printf("Invalid instruction\n");
dumpProgramRegisters();
dumpProcessorRegisters();
dumpMemory();
return true;
}
else if(W.stat == SADR)
{
printf("Invalid memory address\n");
dumpProgramRegisters();
dumpProcessorRegisters();
dumpMemory();
return true;
}
else if(W.stat == SHLT)
{
return true;
}
if(W.icode == DUMP && W.valE & 1)
{
dumpProgramRegisters();
}
if(W.icode == DUMP && W.valE & 2)
{
dumpProcessorRegisters();
}
if(W.icode == DUMP && W.valE & 4)
{
dumpMemory();
}
return false;
}
/*
* update Wregister - updates the Wregister with values from the mem stage
*
* params
* unsigned int stat, unsigned int icode, unsigned int valE
* unsigned int valm, unsigned int dstE, unsigned int dstM
*
*/
void updateWregister(unsigned int stat, unsigned int icode, unsigned int valE,
unsigned int valM, unsigned int dstE, unsigned int dstM)
{
W.stat = stat;
W.icode = icode;
W.valE = valE;
W.valM = valM;
W.dstE = dstE;
W.dstM = dstM;
}