armsupp.c

skyeye的开源代码

ARMul_AddOverflow (ARMul_State * state, ARMword a, ARMword b, ARMword result)
{
	ASSIGNV (AddOverflow (a, b, result));
}

/* Assigns the C flag after an subtraction of a and b to give result.  */

void
ARMul_SubCarry (ARMul_State * state, ARMword a, ARMword b, ARMword result)
{
	ASSIGNC ((NEG (a) && POS (b)) ||
		 (NEG (a) && POS (result)) || (POS (b) && POS (result)));
}

/* Assigns the V flag after an subtraction of a and b to give result.  */

void
ARMul_SubOverflow (ARMul_State * state, ARMword a, ARMword b, ARMword result)
{
	ASSIGNV (SubOverflow (a, b, result));
}

/* This function does the work of generating the addresses used in an
   LDC instruction.  The code here is always post-indexed, it's up to the
   caller to get the input address correct and to handle base register
   modification. It also handles the Busy-Waiting.  */

void
ARMul_LDC (ARMul_State * state, ARMword instr, ARMword address)
{
	unsigned cpab;
	ARMword data;

	UNDEF_LSCPCBaseWb;
	//printf("SKYEYE ARMul_LDC, CPnum is %x, instr %x, addr %x\n",CPNum, instr, address);
/*chy 2004-05-23 should update this function in the future,should concern dataabort*/
// chy 2004-05-25 , fix it now,so needn't printf 
//  printf("SKYEYE ARMul_LDC, should update this function!!!!!\n");
	//exit(-1);

	if (!CP_ACCESS_ALLOWED (state, CPNum)) {
		/* 
		   printf
		   ("SKYEYE ARMul_LDC,NOT ALLOW, underinstr, CPnum is %x, instr %x, addr %x\n",
		   CPNum, instr, address);
		 */
		ARMul_UndefInstr (state, instr);
		return;
	}

	if (ADDREXCEPT (address))
		INTERNALABORT (address);

	cpab = (state->LDC[CPNum]) (state, ARMul_FIRST, instr, 0);
	while (cpab == ARMul_BUSY) {
		ARMul_Icycles (state, 1, 0);

		if (IntPending (state)) {
			cpab = (state->LDC[CPNum]) (state, ARMul_INTERRUPT,
						    instr, 0);
			return;
		}
		else
			cpab = (state->LDC[CPNum]) (state, ARMul_BUSY, instr,
						    0);
	}
	if (cpab == ARMul_CANT) {
		/* 
		   printf
		   ("SKYEYE ARMul_LDC,NOT CAN, underinstr, CPnum is %x, instr %x, addr %x\n",
		   CPNum, instr, address);
		 */
		CPTAKEABORT;
		return;
	}

	cpab = (state->LDC[CPNum]) (state, ARMul_TRANSFER, instr, 0);
	data = ARMul_LoadWordN (state, address);
	//chy 2004-05-25      
	if (state->abortSig || state->Aborted)
		goto L_ldc_takeabort;

	BUSUSEDINCPCN;
//chy 2004-05-25
/*
  if (BIT (21))
    LSBase = state->Base;
*/

	cpab = (state->LDC[CPNum]) (state, ARMul_DATA, instr, data);

	while (cpab == ARMul_INC) {
		address += 4;
		data = ARMul_LoadWordN (state, address);
		//chy 2004-05-25  
		if (state->abortSig || state->Aborted)
			goto L_ldc_takeabort;

		cpab = (state->LDC[CPNum]) (state, ARMul_DATA, instr, data);
	}

//chy 2004-05-25
      L_ldc_takeabort:
	if (BIT (21)) {
		if (!
		    ((state->abortSig || state->Aborted)
		     && state->lateabtSig == LOW))
			LSBase = state->Base;
	}

	if (state->abortSig || state->Aborted)
		TAKEABORT;
}

/* This function does the work of generating the addresses used in an
   STC instruction.  The code here is always post-indexed, it's up to the
   caller to get the input address correct and to handle base register
   modification. It also handles the Busy-Waiting.  */

void
ARMul_STC (ARMul_State * state, ARMword instr, ARMword address)
{
	unsigned cpab;
	ARMword data;

	UNDEF_LSCPCBaseWb;

	//printf("SKYEYE ARMul_STC, CPnum is %x, instr %x, addr %x\n",CPNum, instr, address);
	/*chy 2004-05-23 should update this function in the future,should concern dataabort */
//  skyeye_instr_debug=0;printf("SKYEYE  debug end!!!!\n");
// chy 2004-05-25 , fix it now,so needn't printf 
//  printf("SKYEYE ARMul_STC, should update this function!!!!!\n");

	//exit(-1);
	if (!CP_ACCESS_ALLOWED (state, CPNum)) {
		/* 
		   printf
		   ("SKYEYE ARMul_STC,NOT ALLOW, undefinstr,  CPnum is %x, instr %x, addr %x\n",
		   CPNum, instr, address);
		 */
		ARMul_UndefInstr (state, instr);
		return;
	}

	if (ADDREXCEPT (address) || VECTORACCESS (address))
		INTERNALABORT (address);

	cpab = (state->STC[CPNum]) (state, ARMul_FIRST, instr, &data);
	while (cpab == ARMul_BUSY) {
		ARMul_Icycles (state, 1, 0);
		if (IntPending (state)) {
			cpab = (state->STC[CPNum]) (state, ARMul_INTERRUPT,
						    instr, 0);
			return;
		}
		else
			cpab = (state->STC[CPNum]) (state, ARMul_BUSY, instr,
						    &data);
	}

	if (cpab == ARMul_CANT) {
		/* 
		   printf
		   ("SKYEYE ARMul_STC,CANT, undefinstr,  CPnum is %x, instr %x, addr %x\n",
		   CPNum, instr, address);
		 */
		CPTAKEABORT;
		return;
	}
#ifndef MODE32
	if (ADDREXCEPT (address) || VECTORACCESS (address))
		INTERNALABORT (address);
#endif
	BUSUSEDINCPCN;
//chy 2004-05-25
/*
  if (BIT (21))
    LSBase = state->Base;
*/
	cpab = (state->STC[CPNum]) (state, ARMul_DATA, instr, &data);
	ARMul_StoreWordN (state, address, data);
	//chy 2004-05-25      
	if (state->abortSig || state->Aborted)
		goto L_stc_takeabort;

	while (cpab == ARMul_INC) {
		address += 4;
		cpab = (state->STC[CPNum]) (state, ARMul_DATA, instr, &data);
		ARMul_StoreWordN (state, address, data);
		//chy 2004-05-25  
		if (state->abortSig || state->Aborted)
			goto L_stc_takeabort;
	}
//chy 2004-05-25
      L_stc_takeabort:
	if (BIT (21)) {
		if (!
		    ((state->abortSig || state->Aborted)
		     && state->lateabtSig == LOW))
			LSBase = state->Base;
	}

	if (state->abortSig || state->Aborted)
		TAKEABORT;
}

/* This function does the Busy-Waiting for an MCR instruction.  */

void
ARMul_MCR (ARMul_State * state, ARMword instr, ARMword source)
{
	unsigned cpab;

	//printf("SKYEYE ARMul_MCR, CPnum is %x, source %x\n",CPNum, source);
	if (!CP_ACCESS_ALLOWED (state, CPNum)) {
		//chy 2004-07-19 should fix in the future ????!!!!
		//printf("SKYEYE ARMul_MCR, ACCESS_not ALLOWed, UndefinedInstr  CPnum is %x, source %x\n",CPNum, source);
		ARMul_UndefInstr (state, instr);
		return;
	}

	cpab = (state->MCR[CPNum]) (state, ARMul_FIRST, instr, source);

	while (cpab == ARMul_BUSY) {
		ARMul_Icycles (state, 1, 0);

		if (IntPending (state)) {
			cpab = (state->MCR[CPNum]) (state, ARMul_INTERRUPT,
						    instr, 0);
			return;
		}
		else
			cpab = (state->MCR[CPNum]) (state, ARMul_BUSY, instr,
						    source);
	}

	if (cpab == ARMul_CANT) {
		printf ("SKYEYE ARMul_MCR, CANT, UndefinedInstr  CPnum is %x, source %x\n", CPNum, source);
		ARMul_Abort (state, ARMul_UndefinedInstrV);
	}
	else {
		BUSUSEDINCPCN;
		ARMul_Ccycles (state, 1, 0);
	}
}

/* This function does the Busy-Waiting for an MRC instruction.  */

ARMword
ARMul_MRC (ARMul_State * state, ARMword instr)
{
	unsigned cpab;
	ARMword result = 0;

	//printf("SKYEYE ARMul_MRC, CPnum is %x, instr %x\n",CPNum, instr);
	if (!CP_ACCESS_ALLOWED (state, CPNum)) {
		//chy 2004-07-19 should fix in the future????!!!!
		//printf("SKYEYE ARMul_MRC,NOT ALLOWed UndefInstr  CPnum is %x, instr %x\n",CPNum, instr);
		ARMul_UndefInstr (state, instr);
		return;
	}

	cpab = (state->MRC[CPNum]) (state, ARMul_FIRST, instr, &result);
	while (cpab == ARMul_BUSY) {
		ARMul_Icycles (state, 1, 0);
		if (IntPending (state)) {
			cpab = (state->MRC[CPNum]) (state, ARMul_INTERRUPT,
						    instr, 0);
			return (0);
		}
		else
			cpab = (state->MRC[CPNum]) (state, ARMul_BUSY, instr,
						    &result);
	}
	if (cpab == ARMul_CANT) {
		printf ("SKYEYE ARMul_MRC,CANT UndefInstr  CPnum is %x, instr %x\n", CPNum, instr);
		ARMul_Abort (state, ARMul_UndefinedInstrV);
		/* Parent will destroy the flags otherwise.  */
		result = ECC;
	}
	else {
		BUSUSEDINCPCN;
		ARMul_Ccycles (state, 1, 0);
		ARMul_Icycles (state, 1, 0);
	}

	return result;
}

/* This function does the Busy-Waiting for an CDP instruction.  */

void
ARMul_CDP (ARMul_State * state, ARMword instr)
{
	unsigned cpab;

	if (!CP_ACCESS_ALLOWED (state, CPNum)) {
		ARMul_UndefInstr (state, instr);
		return;
	}

	cpab = (state->CDP[CPNum]) (state, ARMul_FIRST, instr);
	while (cpab == ARMul_BUSY) {
		ARMul_Icycles (state, 1, 0);
		if (IntPending (state)) {
			cpab = (state->CDP[CPNum]) (state, ARMul_INTERRUPT,
						    instr);
			return;
		}
		else
			cpab = (state->CDP[CPNum]) (state, ARMul_BUSY, instr);
	}
	if (cpab == ARMul_CANT)
		ARMul_Abort (state, ARMul_UndefinedInstrV);
	else
		BUSUSEDN;
}

/* This function handles Undefined instructions, as CP isntruction.  */

void
ARMul_UndefInstr (ARMul_State * state, ARMword instr ATTRIBUTE_UNUSED)
{
	ARMul_Abort (state, ARMul_UndefinedInstrV);
}

/* Return TRUE if an interrupt is pending, FALSE otherwise.  */

unsigned
IntPending (ARMul_State * state)
{
	/* Any exceptions.  */
	if (state->NresetSig == LOW) {
		ARMul_Abort (state, ARMul_ResetV);
		return TRUE;
	}
	else if (!state->NfiqSig && !FFLAG) {
		ARMul_Abort (state, ARMul_FIQV);
		return TRUE;
	}
	else if (!state->NirqSig && !IFLAG) {
		ARMul_Abort (state, ARMul_IRQV);
		return TRUE;
	}

	return FALSE;
}

/* Align a word access to a non word boundary.  */

ARMword
ARMul_Align (state, address, data)
     ARMul_State *state ATTRIBUTE_UNUSED;
     ARMword address;
     ARMword data;
{
	/* This code assumes the address is really unaligned,
	   as a shift by 32 is undefined in C.  */

	address = (address & 3) << 3;	/* Get the word address.  */
	return ((data >> address) | (data << (32 - address)));	/* rot right */
}

/* This routine is used to call another routine after a certain number of
   cycles have been executed. The first parameter is the number of cycles
   delay before the function is called, the second argument is a pointer
   to the function. A delay of zero doesn't work, just call the function.  */

void
ARMul_ScheduleEvent (ARMul_State * state, unsigned int delay,
		     unsigned (*what) (ARMul_State *))
{
	unsigned int when;
	struct EventNode *event;

	if (state->EventSet++ == 0)
		state->Now = ARMul_Time (state);
	when = (state->Now + delay) % EVENTLISTSIZE;
	event = (struct EventNode *) malloc (sizeof (struct EventNode));
	if (!event) {
		printf ("SKYEYE:ARMul_ScheduleEvent: malloc event error\n");
		skyeye_exit (-1);
	}
	event->func = what;
	event->next = *(state->EventPtr + when);
	*(state->EventPtr + when) = event;
}

/* This routine is called at the beginning of
   every cycle, to envoke scheduled events.  */

void
ARMul_EnvokeEvent (ARMul_State * state)
{
	static unsigned int then;

	then = state->Now;
	state->Now = ARMul_Time (state) % EVENTLISTSIZE;
	if (then < state->Now)
		/* Schedule events.  */
		EnvokeList (state, then, state->Now);
	else if (then > state->Now) {
		/* Need to wrap around the list.  */
		EnvokeList (state, then, EVENTLISTSIZE - 1L);
		EnvokeList (state, 0L, state->Now);
	}
}

/* Envokes all the entries in a range.  */

static void
EnvokeList (ARMul_State * state, unsigned int from, unsigned int to)
{
	for (; from <= to; from++) {
		struct EventNode *anevent;

		anevent = *(state->EventPtr + from);
		while (anevent) {
			(anevent->func) (state);
			state->EventSet--;
			anevent = anevent->next;
		}
		*(state->EventPtr + from) = NULL;
	}
}

/* This routine is returns the number of clock ticks since the last reset.  */

unsigned int
ARMul_Time (ARMul_State * state)
{
	return (state->NumScycles + state->NumNcycles +
		state->NumIcycles + state->NumCcycles + state->NumFcycles);
}