path: root/src/core/arm/interpreter/armsupp.cpp

/*  armsupp.c -- ARMulator support code:  ARM6 Instruction Emulator.
    Copyright (C) 1994 Advanced RISC Machines Ltd.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */

#include "armdefs.h"
#include "armemu.h"

//#include "ansidecl.h"
#include "skyeye_defs.h"
#include "core/hle/coprocessor.h"
#include "core/arm/disassembler/arm_disasm.h"

unsigned xscale_cp15_cp_access_allowed (ARMul_State * state, unsigned reg,
                                        unsigned cpnum);
//extern int skyeye_instr_debug;
/* Definitions for the support routines.  */

static ARMword ModeToBank (ARMword);
static void EnvokeList (ARMul_State *, unsigned int, unsigned int);

struct EventNode
{				/* An event list node.  */
	unsigned (*func) (ARMul_State *);	/* The function to call.  */
	struct EventNode *next;
};

/* This routine returns the value of a register from a mode.  */

ARMword
ARMul_GetReg (ARMul_State * state, unsigned mode, unsigned reg)
{
	mode &= MODEBITS;
	if (mode != state->Mode)
		return (state->RegBank[ModeToBank ((ARMword) mode)][reg]);
	else
		return (state->Reg[reg]);
}

/* This routine sets the value of a register for a mode.  */

void
ARMul_SetReg (ARMul_State * state, unsigned mode, unsigned reg, ARMword value)
{
	mode &= MODEBITS;
	if (mode != state->Mode)
		state->RegBank[ModeToBank ((ARMword) mode)][reg] = value;
	else
		state->Reg[reg] = value;
}

/* This routine returns the value of the PC, mode independently.  */

ARMword
ARMul_GetPC (ARMul_State * state)
{
	if (state->Mode > SVC26MODE)
		return state->Reg[15];
	else
		return R15PC;
}

/* This routine returns the value of the PC, mode independently.  */

ARMword
ARMul_GetNextPC (ARMul_State * state)
{
	if (state->Mode > SVC26MODE)
		return state->Reg[15] + isize;
	else
		return (state->Reg[15] + isize) & R15PCBITS;
}

/* This routine sets the value of the PC.  */

void
ARMul_SetPC (ARMul_State * state, ARMword value)
{
	if (ARMul_MODE32BIT)
		state->Reg[15] = value & PCBITS;
	else
		state->Reg[15] = R15CCINTMODE | (value & R15PCBITS);
	FLUSHPIPE;
}

/* This routine returns the value of register 15, mode independently.  */

ARMword
ARMul_GetR15 (ARMul_State * state)
{
	if (state->Mode > SVC26MODE)
		return (state->Reg[15]);
	else
		return (R15PC | ECC | ER15INT | EMODE);
}

/* This routine sets the value of Register 15.  */

void
ARMul_SetR15 (ARMul_State * state, ARMword value)
{
	if (ARMul_MODE32BIT)
		state->Reg[15] = value & PCBITS;
	else {
		state->Reg[15] = value;
		ARMul_R15Altered (state);
	}
	FLUSHPIPE;
}

/* This routine returns the value of the CPSR.  */

ARMword
ARMul_GetCPSR (ARMul_State * state)
{
	//chy 2003-08-20: below is from gdb20030716, maybe isn't suitable for system simulator
	//return (CPSR | state->Cpsr); for gdb20030716
    // NOTE(bunnei): Changed this from [now] commented out macro "CPSR"
    return ((ECC | EINT | EMODE | (TFLAG << 5)));	//had be tested in old skyeye with gdb5.0-5.3
}

/* This routine sets the value of the CPSR.  */

void
ARMul_SetCPSR (ARMul_State * state, ARMword value)
{
	state->Cpsr = value;
	ARMul_CPSRAltered (state);
}

/* This routine does all the nasty bits involved in a write to the CPSR,
   including updating the register bank, given a MSR instruction.  */

void
ARMul_FixCPSR (ARMul_State * state, ARMword instr, ARMword rhs)
{  
	state->Cpsr = ARMul_GetCPSR (state);
	//chy 2006-02-16 , should not consider system mode, don't conside 26bit mode
	if (state->Mode != USER26MODE && state->Mode != USER32MODE ) {
		/* In user mode, only write flags.  */
		if (BIT (16))
			SETPSR_C (state->Cpsr, rhs);
		if (BIT (17))
			SETPSR_X (state->Cpsr, rhs);
		if (BIT (18))
			SETPSR_S (state->Cpsr, rhs);
	}
	if (BIT (19))
		SETPSR_F (state->Cpsr, rhs);
	ARMul_CPSRAltered (state);
}

/* Get an SPSR from the specified mode.  */

ARMword
ARMul_GetSPSR (ARMul_State * state, ARMword mode)
{
	ARMword bank = ModeToBank (mode & MODEBITS);

	if (!BANK_CAN_ACCESS_SPSR (bank))
		return ARMul_GetCPSR (state);

	return state->Spsr[bank];
}

/* This routine does a write to an SPSR.  */

void
ARMul_SetSPSR (ARMul_State * state, ARMword mode, ARMword value)
{
	ARMword bank = ModeToBank (mode & MODEBITS);

	if (BANK_CAN_ACCESS_SPSR (bank))
		state->Spsr[bank] = value;
}

/* This routine does a write to the current SPSR, given an MSR instruction.  */

void
ARMul_FixSPSR (ARMul_State * state, ARMword instr, ARMword rhs)
{
	if (BANK_CAN_ACCESS_SPSR (state->Bank)) {
		if (BIT (16))
			SETPSR_C (state->Spsr[state->Bank], rhs);
		if (BIT (17))
			SETPSR_X (state->Spsr[state->Bank], rhs);
		if (BIT (18))
			SETPSR_S (state->Spsr[state->Bank], rhs);
		if (BIT (19))
			SETPSR_F (state->Spsr[state->Bank], rhs);
	}
}

/* This routine updates the state of the emulator after the Cpsr has been
   changed.  Both the processor flags and register bank are updated.  */

void
ARMul_CPSRAltered (ARMul_State * state)
{
	ARMword oldmode;

	if (state->prog32Sig == LOW)
		state->Cpsr &= (CCBITS | INTBITS | R15MODEBITS);

	oldmode = state->Mode;

	if (state->Mode != (state->Cpsr & MODEBITS)) {
		state->Mode =
			ARMul_SwitchMode (state, state->Mode,
					  state->Cpsr & MODEBITS);

		state->NtransSig = (state->Mode & 3) ? HIGH : LOW;
	}
	//state->Cpsr &= ~MODEBITS;

	ASSIGNINT (state->Cpsr & INTBITS);
	//state->Cpsr &= ~INTBITS;
	ASSIGNN ((state->Cpsr & NBIT) != 0);
	//state->Cpsr &= ~NBIT;
	ASSIGNZ ((state->Cpsr & ZBIT) != 0);
	//state->Cpsr &= ~ZBIT;
	ASSIGNC ((state->Cpsr & CBIT) != 0);
	//state->Cpsr &= ~CBIT;
	ASSIGNV ((state->Cpsr & VBIT) != 0);
	//state->Cpsr &= ~VBIT;
	ASSIGNS ((state->Cpsr & SBIT) != 0);
	//state->Cpsr &= ~SBIT;
#ifdef MODET
	ASSIGNT ((state->Cpsr & TBIT) != 0);
	//state->Cpsr &= ~TBIT;
#endif

	if (oldmode > SVC26MODE) {
		if (state->Mode <= SVC26MODE) {
			state->Emulate = CHANGEMODE;
			state->Reg[15] = ECC | ER15INT | EMODE | R15PC;
		}
	}
	else {
		if (state->Mode > SVC26MODE) {
			state->Emulate = CHANGEMODE;
			state->Reg[15] = R15PC;
		}
		else
			state->Reg[15] = ECC | ER15INT | EMODE | R15PC;
	}
}

/* This routine updates the state of the emulator after register 15 has
   been changed.  Both the processor flags and register bank are updated.
   This routine should only be called from a 26 bit mode.  */

void
ARMul_R15Altered (ARMul_State * state)
{
	if (state->Mode != R15MODE) {
		state->Mode = ARMul_SwitchMode (state, state->Mode, R15MODE);
		state->NtransSig = (state->Mode & 3) ? HIGH : LOW;
	}

	if (state->Mode > SVC26MODE)
		state->Emulate = CHANGEMODE;

	ASSIGNR15INT (R15INT);

	ASSIGNN ((state->Reg[15] & NBIT) != 0);
	ASSIGNZ ((state->Reg[15] & ZBIT) != 0);
	ASSIGNC ((state->Reg[15] & CBIT) != 0);
	ASSIGNV ((state->Reg[15] & VBIT) != 0);
}

/* This routine controls the saving and restoring of registers across mode
   changes.  The regbank matrix is largely unused, only rows 13 and 14 are
   used across all modes, 8 to 14 are used for FIQ, all others use the USER
   column.  It's easier this way.  old and new parameter are modes numbers.
   Notice the side effect of changing the Bank variable.  */

ARMword
ARMul_SwitchMode (ARMul_State * state, ARMword oldmode, ARMword newmode)
{
	unsigned i;
	ARMword oldbank;
	ARMword newbank;
	static int revision_value = 53;

	oldbank = ModeToBank (oldmode);
	newbank = state->Bank = ModeToBank (newmode);

	/* Do we really need to do it?  */
	if (oldbank != newbank) {
		if (oldbank == 3 && newbank == 2) {
			//printf("icounter is %d PC is %x MODE CHANGED : %d --> %d\n", state->NumInstrs, state->pc, oldbank, newbank);
			if (state->NumInstrs >= 5832487) {
//				printf("%d, ", state->NumInstrs + revision_value);
//				printf("revision_value : %d\n", revision_value);
				revision_value ++;
			}
		}
		/* Save away the old registers.  */
		switch (oldbank) {
		case USERBANK:
		case IRQBANK:
		case SVCBANK:
		case ABORTBANK:
		case UNDEFBANK:
			if (newbank == FIQBANK)
				for (i = 8; i < 13; i++)
					state->RegBank[USERBANK][i] =
						state->Reg[i];
			state->RegBank[oldbank][13] = state->Reg[13];
			state->RegBank[oldbank][14] = state->Reg[14];
			break;
		case FIQBANK:
			for (i = 8; i < 15; i++)
				state->RegBank[FIQBANK][i] = state->Reg[i];
			break;
		case DUMMYBANK:
			for (i = 8; i < 15; i++)
				state->RegBank[DUMMYBANK][i] = 0;
			break;
		default:
			abort ();
		}

		/* Restore the new registers.  */
		switch (newbank) {
		case USERBANK:
		case IRQBANK:
		case SVCBANK:
		case ABORTBANK:
		case UNDEFBANK:
			if (oldbank == FIQBANK)
				for (i = 8; i < 13; i++)
					state->Reg[i] =
						state->RegBank[USERBANK][i];
			state->Reg[13] = state->RegBank[newbank][13];
			state->Reg[14] = state->RegBank[newbank][14];
			break;
		case FIQBANK:
			for (i = 8; i < 15; i++)
				state->Reg[i] = state->RegBank[FIQBANK][i];
			break;
		case DUMMYBANK:
			for (i = 8; i < 15; i++)
				state->Reg[i] = 0;
			break;
		default:
			abort ();
		}
	}

	return newmode;
}

/* Given a processor mode, this routine returns the
   register bank that will be accessed in that mode.  */

static ARMword
ModeToBank (ARMword mode)
{
	static ARMword bankofmode[] = {
		USERBANK, FIQBANK, IRQBANK, SVCBANK,
		DUMMYBANK, DUMMYBANK, DUMMYBANK, DUMMYBANK,
		DUMMYBANK, DUMMYBANK, DUMMYBANK, DUMMYBANK,
		DUMMYBANK, DUMMYBANK, DUMMYBANK, DUMMYBANK,
		USERBANK, FIQBANK, IRQBANK, SVCBANK,
		DUMMYBANK, DUMMYBANK, DUMMYBANK, ABORTBANK,
		DUMMYBANK, DUMMYBANK, DUMMYBANK, UNDEFBANK,
		DUMMYBANK, DUMMYBANK, DUMMYBANK, SYSTEMBANK
	};

	if (mode >= (sizeof (bankofmode) / sizeof (bankofmode[0])))
		return DUMMYBANK;

	return bankofmode[mode];
}

/* Returns the register number of the nth register in a reg list.  */

unsigned
ARMul_NthReg (ARMword instr, unsigned number)
{
	unsigned bit, upto;

	for (bit = 0, upto = 0; upto <= number; bit++)
		if (BIT (bit))
			upto++;

	return (bit - 1);
}

/* Assigns the N and Z flags depending on the value of result.  */

void
ARMul_NegZero (ARMul_State * state, ARMword result)
{
	if (NEG (result)) {
		SETN;
		CLEARZ;
	}
	else if (result == 0) {
		CLEARN;
		SETZ;
	}
	else {
		CLEARN;
		CLEARZ;
	}
}

/* Compute whether an addition of A and B, giving RESULT, overflowed.  */

int
AddOverflow (ARMword a, ARMword b, ARMword result)
{
	return ((NEG (a) && NEG (b) && POS (result))
		|| (POS (a) && POS (b) && NEG (result)));
}

/* Compute whether a subtraction of A and B, giving RESULT, overflowed.  */

int
SubOverflow (ARMword a, ARMword b, ARMword result)
{
	return ((NEG (a) && POS (b) && POS (result))
		|| (POS (a) && NEG (b) && NEG (result)));
}

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

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

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

void
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)
{
    HLE::CallMCR(instr, 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 %x CPnum is %x, source %x\n", instr, CPNum, source);
	//	ARMul_Abort (state, ARMul_UndefinedInstrV);
	//}
	//else {
	//	BUSUSEDINCPCN;
	//	ARMul_Ccycles (state, 1, 0);
	//}
}

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

void
ARMul_MCRR (ARMul_State * state, ARMword instr, ARMword source1, ARMword source2)
{
	unsigned cpab;

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

	cpab = (state->MCRR[CPNum]) (state, ARMul_FIRST, instr, source1, source2);

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

		if (IntPending (state)) {
			cpab = (state->MCRR[CPNum]) (state, ARMul_INTERRUPT,
						    instr, 0, 0);
			return;
		}
		else
			cpab = (state->MCRR[CPNum]) (state, ARMul_BUSY, instr,
						    source1, source2);
	}
	if (cpab == ARMul_CANT) {
		printf ("In %s, CoProcesscor returned CANT, CPnum is %x, instr %x, source %x %x\n", __FUNCTION__, CPNum, instr, source1, source2);
		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 = HLE::CallMRC(instr);

	////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 -1;
	//}

	//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 MRRC instruction. (to verify) */

void
ARMul_MRRC (ARMul_State * state, ARMword instr, ARMword * dest1, ARMword * dest2)
{
	unsigned cpab;
	ARMword result1 = 0;
	ARMword result2 = 0;

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

	cpab = (state->MRRC[CPNum]) (state, ARMul_FIRST, instr, &result1, &result2);
	while (cpab == ARMul_BUSY) {
		ARMul_Icycles (state, 1, 0);
		if (IntPending (state)) {
			cpab = (state->MRRC[CPNum]) (state, ARMul_INTERRUPT,
						    instr, 0, 0);
			return;
		}
		else
			cpab = (state->MRRC[CPNum]) (state, ARMul_BUSY, instr,
						    &result1, &result2);
	}
	if (cpab == ARMul_CANT) {
		printf ("In %s, CoProcesscor returned CANT, CPnum is %x, instr %x\n", __FUNCTION__, CPNum, instr);
		ARMul_Abort (state, ARMul_UndefinedInstrV);
	}
	else {
		BUSUSEDINCPCN;
		ARMul_Ccycles (state, 1, 0);
		ARMul_Icycles (state, 1, 0);
	}
	
	*dest1 = result1;
	*dest2 = result2;
}

/* 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)
{
	char buff[512];
	ARM_Disasm disasm = ARM_Disasm();
	disasm.disasm(state->pc, instr, buff);
	ERROR_LOG(ARM11, "Undefined instruction!! Disasm: %s Opcode: 0x%x", buff, instr);
	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 (ARMul_State *state, 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));

	_dbg_assert_msg_(ARM11, event, "SKYEYE:ARMul_ScheduleEvent: malloc event error\n");

	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);
}