path: root/src/core/arm/interpreter/mmu/maverick.cpp

/*  maverick.c -- Cirrus/DSP co-processor interface.
    Copyright (C) 2003 Free Software Foundation, Inc.
    Contributed by Aldy Hernandez (aldyh@redhat.com).
 
    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 <assert.h>

#include "core/arm/interpreter/armdefs.h"
#include "core/arm/interpreter/armemu.h"


/*#define CIRRUS_DEBUG 1	*/
#if CIRRUS_DEBUG
#  define printfdbg printf
#else
#  define printfdbg printf_nothing
#endif

#define POS64(i) ( (~(i)) >> 63 )
#define NEG64(i) ( (i) >> 63 )

/* Define Co-Processor instruction handlers here.  */

/* Here's ARMulator's DSP definition.  A few things to note:
   1) it has 16 64-bit registers and 4 72-bit accumulators
   2) you can only access its registers with MCR and MRC.  */

/* We can't define these in here because this file might not be linked
   unless the target is arm9e-*.  They are defined in wrapper.c.
   Eventually the simulator should be made to handle any coprocessor
   at run time.  */
struct maverick_regs
{
	union
	{
		int i;
		float f;
	} upper;

	union
	{
		int i;
		float f;
	} lower;
};

union maverick_acc_regs
{
	long double ld;		/* Acc registers are 72-bits.  */
};

struct maverick_regs DSPregs[16];
union maverick_acc_regs DSPacc[4];
ARMword DSPsc;

#define DEST_REG	(BITS (12, 15))
#define SRC1_REG	(BITS (16, 19))
#define SRC2_REG	(BITS (0, 3))

static int lsw_int_index, msw_int_index;
static int lsw_float_index, msw_float_index;

static double mv_getRegDouble (int);
static long long mv_getReg64int (int);
static void mv_setRegDouble (int, double val);
static void mv_setReg64int (int, long long val);

static union
{
	double d;
	long long ll;
	int ints[2];
} reg_conv;

static void
printf_nothing (const char *foo, ...)
{
}

static void
cirrus_not_implemented (const char *insn)
{
	fprintf (stderr, "Cirrus instruction '%s' not implemented.\n", insn);
	fprintf (stderr, "aborting!\n");

	// skyeye_exit (1);
}

static unsigned
DSPInit (ARMul_State * state)
{
	NOTICE_LOG(ARM11, "ARMul_ConsolePrint: DSP present");
	return TRUE;
}

unsigned
DSPMRC4 (ARMul_State * state,
	 unsigned type, ARMword instr, ARMword * value)
{
	switch (BITS (5, 7)) {
	case 0:		/* cfmvrdl */
		/* Move lower half of a DF stored in a DSP reg into an Arm reg.  */
		printfdbg ("cfmvrdl\n");
		printfdbg ("\tlower half=0x%x\n", DSPregs[SRC1_REG].lower.i);
		printfdbg ("\tentire thing=%g\n", mv_getRegDouble (SRC1_REG));

		*value = (ARMword) DSPregs[SRC1_REG].lower.i;
		break;

	case 1:		/* cfmvrdh */
		/* Move upper half of a DF stored in a DSP reg into an Arm reg.  */
		printfdbg ("cfmvrdh\n");
		printfdbg ("\tupper half=0x%x\n", DSPregs[SRC1_REG].upper.i);
		printfdbg ("\tentire thing=%g\n", mv_getRegDouble (SRC1_REG));

		*value = (ARMword) DSPregs[SRC1_REG].upper.i;
		break;

	case 2:		/* cfmvrs */
		/* Move SF from upper half of a DSP register to an Arm register.  */
		*value = (ARMword) DSPregs[SRC1_REG].upper.i;
		printfdbg ("cfmvrs = mvf%d <-- %f\n",
			   SRC1_REG, DSPregs[SRC1_REG].upper.f);
		break;

#ifdef doesnt_work
	case 4:		/* cfcmps */
		{
			float a, b;
			int n, z, c, v;

			a = DSPregs[SRC1_REG].upper.f;
			b = DSPregs[SRC2_REG].upper.f;

			printfdbg ("cfcmps\n");
			printfdbg ("\tcomparing %f and %f\n", a, b);

			z = a == b;	/* zero */
			n = a != b;	/* negative */
			v = a > b;	/* overflow */
			c = 0;	/* carry */
			*value = (n << 31) | (z << 30) | (c << 29) | (v <<
								      28);
			break;
		}

	case 5:		/* cfcmpd */
		{
			double a, b;
			int n, z, c, v;

			a = mv_getRegDouble (SRC1_REG);
			b = mv_getRegDouble (SRC2_REG);

			printfdbg ("cfcmpd\n");
			printfdbg ("\tcomparing %g and %g\n", a, b);

			z = a == b;	/* zero */
			n = a != b;	/* negative */
			v = a > b;	/* overflow */
			c = 0;	/* carry */
			*value = (n << 31) | (z << 30) | (c << 29) | (v <<
								      28);
			break;
		}
#else
	case 4:		/* cfcmps */
		{
			float a, b;
			int n, z, c, v;

			a = DSPregs[SRC1_REG].upper.f;
			b = DSPregs[SRC2_REG].upper.f;

			printfdbg ("cfcmps\n");
			printfdbg ("\tcomparing %f and %f\n", a, b);

			z = a == b;	/* zero */
			n = a < b;	/* negative */
			c = a > b;	/* carry */
			v = 0;	/* fixme */
			printfdbg ("\tz = %d, n = %d\n", z, n);
			*value = (n << 31) | (z << 30) | (c << 29) | (v <<
								      28);
			break;
		}

	case 5:		/* cfcmpd */
		{
			double a, b;
			int n, z, c, v;

			a = mv_getRegDouble (SRC1_REG);
			b = mv_getRegDouble (SRC2_REG);

			printfdbg ("cfcmpd\n");
			printfdbg ("\tcomparing %g and %g\n", a, b);

			z = a == b;	/* zero */
			n = a < b;	/* negative */
			c = a > b;	/* carry */
			v = 0;	/* fixme */
			*value = (n << 31) | (z << 30) | (c << 29) | (v <<
								      28);
			break;
		}
#endif
	default:
		fprintf (stderr, "unknown opcode in DSPMRC4 0x%x\n", instr);
		cirrus_not_implemented ("unknown");
		break;
	}

	return ARMul_DONE;
}

unsigned
DSPMRC5 (ARMul_State * state,
	 unsigned type, ARMword instr, ARMword * value)
{
	switch (BITS (5, 7)) {
	case 0:		/* cfmvr64l */
		/* Move lower half of 64bit int from Cirrus to Arm.  */
		*value = (ARMword) DSPregs[SRC1_REG].lower.i;
		printfdbg ("cfmvr64l ARM_REG = mvfx%d <-- %d\n",
			   DEST_REG, (int) *value);
		break;

	case 1:		/* cfmvr64h */
		/* Move upper half of 64bit int from Cirrus to Arm.  */
		*value = (ARMword) DSPregs[SRC1_REG].upper.i;
		printfdbg ("cfmvr64h <-- %d\n", (int) *value);
		break;

	case 4:		/* cfcmp32 */
		{
			int res;
			int n, z, c, v;
			unsigned int a, b;

			printfdbg ("cfcmp32 mvfx%d - mvfx%d\n", SRC1_REG,
				   SRC2_REG);

			/* FIXME: see comment for cfcmps.  */
			a = DSPregs[SRC1_REG].lower.i;
			b = DSPregs[SRC2_REG].lower.i;

			res = DSPregs[SRC1_REG].lower.i -
				DSPregs[SRC2_REG].lower.i;
			/* zero */
			z = res == 0;
			/* negative */
			n = res < 0;
			/* overflow */
			v = SubOverflow (DSPregs[SRC1_REG].lower.i,
					 DSPregs[SRC2_REG].lower.i, res);
			/* carry */
			c = (NEG (a) && POS (b) ||
			     (NEG (a) && POS (res)) || (POS (b)
							&& POS (res)));

			*value = (n << 31) | (z << 30) | (c << 29) | (v <<
								      28);
			break;
		}

	case 5:		/* cfcmp64 */
		{
			long long res;
			int n, z, c, v;
			unsigned long long a, b;

			printfdbg ("cfcmp64 mvdx%d - mvdx%d\n", SRC1_REG,
				   SRC2_REG);

			/* fixme: see comment for cfcmps.  */

			a = mv_getReg64int (SRC1_REG);
			b = mv_getReg64int (SRC2_REG);

			res = mv_getReg64int (SRC1_REG) -
				mv_getReg64int (SRC2_REG);
			/* zero */
			z = res == 0;
			/* negative */
			n = res < 0;
			/* overflow */
			v = ((NEG64 (a) && POS64 (b) && POS64 (res))
			     || (POS64 (a) && NEG64 (b) && NEG64 (res)));
			/* carry */
			c = (NEG64 (a) && POS64 (b) ||
			     (NEG64 (a) && POS64 (res)) || (POS64 (b)
							    && POS64 (res)));

			*value = (n << 31) | (z << 30) | (c << 29) | (v <<
								      28);
			break;
		}

	default:
		fprintf (stderr, "unknown opcode in DSPMRC5 0x%x\n", instr);
		cirrus_not_implemented ("unknown");
		break;
	}

	return ARMul_DONE;
}

unsigned
DSPMRC6 (ARMul_State * state,
	 unsigned type, ARMword instr, ARMword * value)
{
	switch (BITS (5, 7)) {
	case 0:		/* cfmval32 */
		cirrus_not_implemented ("cfmval32");
		break;

	case 1:		/* cfmvam32 */
		cirrus_not_implemented ("cfmvam32");
		break;

	case 2:		/* cfmvah32 */
		cirrus_not_implemented ("cfmvah32");
		break;

	case 3:		/* cfmva32 */
		cirrus_not_implemented ("cfmva32");
		break;

	case 4:		/* cfmva64 */
		cirrus_not_implemented ("cfmva64");
		break;

	case 5:		/* cfmvsc32 */
		cirrus_not_implemented ("cfmvsc32");
		break;

	default:
		fprintf (stderr, "unknown opcode in DSPMRC6 0x%x\n", instr);
		cirrus_not_implemented ("unknown");
		break;
	}

	return ARMul_DONE;
}

unsigned
DSPMCR4 (ARMul_State * state,
	 unsigned type, ARMword instr, ARMword value)
{
	switch (BITS (5, 7)) {
	case 0:		/* cfmvdlr */
		/* Move the lower half of a DF value from an Arm register into
		   the lower half of a Cirrus register.  */
		printfdbg ("cfmvdlr <-- 0x%x\n", (int) value);
		DSPregs[SRC1_REG].lower.i = (int) value;
		break;

	case 1:		/* cfmvdhr */
		/* Move the upper half of a DF value from an Arm register into
		   the upper half of a Cirrus register.  */
		printfdbg ("cfmvdhr <-- 0x%x\n", (int) value);
		DSPregs[SRC1_REG].upper.i = (int) value;
		break;

	case 2:		/* cfmvsr */
		/* Move SF from Arm register into upper half of Cirrus register.  */
		printfdbg ("cfmvsr <-- 0x%x\n", (int) value);
		DSPregs[SRC1_REG].upper.i = (int) value;
		break;

	default:
		fprintf (stderr, "unknown opcode in DSPMCR4 0x%x\n", instr);
		cirrus_not_implemented ("unknown");
		break;
	}

	return ARMul_DONE;
}

unsigned
DSPMCR5 (ARMul_State * state,
	 unsigned type, ARMword instr, ARMword value)
{
	union
	{
		int s;
		unsigned int us;
	} val;

	switch (BITS (5, 7)) {
	case 0:		/* cfmv64lr */
		/* Move lower half of a 64bit int from an ARM register into the
		   lower half of a DSP register and sign extend it.  */
		printfdbg ("cfmv64lr mvdx%d <-- 0x%x\n", SRC1_REG,
			   (int) value);
		DSPregs[SRC1_REG].lower.i = (int) value;
		break;

	case 1:		/* cfmv64hr */
		/* Move upper half of a 64bit int from an ARM register into the
		   upper half of a DSP register.  */
		printfdbg ("cfmv64hr ARM_REG = mvfx%d <-- 0x%x\n",
			   SRC1_REG, (int) value);
		DSPregs[SRC1_REG].upper.i = (int) value;
		break;

	case 2:		/* cfrshl32 */
		printfdbg ("cfrshl32\n");
		val.us = value;
		if (val.s > 0)
			DSPregs[SRC2_REG].lower.i =
				DSPregs[SRC1_REG].lower.i << value;
		else
			DSPregs[SRC2_REG].lower.i =
				DSPregs[SRC1_REG].lower.i >> -value;
		break;

	case 3:		/* cfrshl64 */
		printfdbg ("cfrshl64\n");
		val.us = value;
		if (val.s > 0)
			mv_setReg64int (SRC2_REG,
					mv_getReg64int (SRC1_REG) << value);
		else
			mv_setReg64int (SRC2_REG,
					mv_getReg64int (SRC1_REG) >> -value);
		break;

	default:
		fprintf (stderr, "unknown opcode in DSPMCR5 0x%x\n", instr);
		cirrus_not_implemented ("unknown");
		break;
	}

	return ARMul_DONE;
}

unsigned
DSPMCR6 (ARMul_State * state,
	 unsigned type, ARMword instr, ARMword value)
{
	switch (BITS (5, 7)) {
	case 0:		/* cfmv32al */
		cirrus_not_implemented ("cfmv32al");
		break;

	case 1:		/* cfmv32am */
		cirrus_not_implemented ("cfmv32am");
		break;

	case 2:		/* cfmv32ah */
		cirrus_not_implemented ("cfmv32ah");
		break;

	case 3:		/* cfmv32a */
		cirrus_not_implemented ("cfmv32a");
		break;

	case 4:		/* cfmv64a */
		cirrus_not_implemented ("cfmv64a");
		break;

	case 5:		/* cfmv32sc */
		cirrus_not_implemented ("cfmv32sc");
		break;

	default:
		fprintf (stderr, "unknown opcode in DSPMCR6 0x%x\n", instr);
		cirrus_not_implemented ("unknown");
		break;
	}

	return ARMul_DONE;
}

unsigned
DSPLDC4 (ARMul_State * state,
	 unsigned type, ARMword instr, ARMword data)
{
	static unsigned words;

	if (type != ARMul_DATA) {
		words = 0;
		return ARMul_DONE;
	}

	if (BIT (22)) {		/* it's a long access, get two words */
		/* cfldrd */

		printfdbg
			("cfldrd: %x (words = %d) (bigend = %d) DESTREG = %d\n",
			 data, words, state->bigendSig, DEST_REG);

		if (words == 0) {
			if (state->bigendSig)
				DSPregs[DEST_REG].upper.i = (int) data;
			else
				DSPregs[DEST_REG].lower.i = (int) data;
		}
		else {
			if (state->bigendSig)
				DSPregs[DEST_REG].lower.i = (int) data;
			else
				DSPregs[DEST_REG].upper.i = (int) data;
		}

		++words;

		if (words == 2) {
			printfdbg ("\tmvd%d <-- mem = %g\n", DEST_REG,
				   mv_getRegDouble (DEST_REG));

			return ARMul_DONE;
		}
		else
			return ARMul_INC;
	}
	else {
		/* Get just one word.  */

		/* cfldrs */
		printfdbg ("cfldrs\n");

		DSPregs[DEST_REG].upper.i = (int) data;

		printfdbg ("\tmvf%d <-- mem = %f\n", DEST_REG,
			   DSPregs[DEST_REG].upper.f);

		return ARMul_DONE;
	}
}

unsigned
DSPLDC5 (ARMul_State * state,
	 unsigned type, ARMword instr, ARMword data)
{
	static unsigned words;

	if (type != ARMul_DATA) {
		words = 0;
		return ARMul_DONE;
	}

	if (BIT (22)) {
		/* It's a long access, get two words.  */

		/* cfldr64 */
		printfdbg ("cfldr64: %d\n", data);

		if (words == 0) {
			if (state->bigendSig)
				DSPregs[DEST_REG].upper.i = (int) data;
			else
				DSPregs[DEST_REG].lower.i = (int) data;
		}
		else {
			if (state->bigendSig)
				DSPregs[DEST_REG].lower.i = (int) data;
			else
				DSPregs[DEST_REG].upper.i = (int) data;
		}

		++words;

		if (words == 2) {
			printfdbg ("\tmvdx%d <-- mem = %lld\n", DEST_REG,
				   mv_getReg64int (DEST_REG));

			return ARMul_DONE;
		}
		else
			return ARMul_INC;
	}
	else {
		/* Get just one word.  */

		/* cfldr32 */
		printfdbg ("cfldr32 mvfx%d <-- %d\n", DEST_REG, (int) data);

		/* 32bit ints should be sign extended to 64bits when loaded.  */
		mv_setReg64int (DEST_REG, (long long) data);

		return ARMul_DONE;
	}
}

unsigned
DSPSTC4 (ARMul_State * state,
	 unsigned type, ARMword instr, ARMword * data)
{
	static unsigned words;

	if (type != ARMul_DATA) {
		words = 0;
		return ARMul_DONE;
	}

	if (BIT (22)) {
		/* It's a long access, get two words.  */
		/* cfstrd */
		printfdbg ("cfstrd\n");

		if (words == 0) {
			if (state->bigendSig)
				*data = (ARMword) DSPregs[DEST_REG].upper.i;
			else
				*data = (ARMword) DSPregs[DEST_REG].lower.i;
		}
		else {
			if (state->bigendSig)
				*data = (ARMword) DSPregs[DEST_REG].lower.i;
			else
				*data = (ARMword) DSPregs[DEST_REG].upper.i;
		}

		++words;

		if (words == 2) {
			printfdbg ("\tmem = mvd%d = %g\n", DEST_REG,
				   mv_getRegDouble (DEST_REG));

			return ARMul_DONE;
		}
		else
			return ARMul_INC;
	}
	else {
		/* Get just one word.  */
		/* cfstrs */
		printfdbg ("cfstrs mvf%d <-- %f\n", DEST_REG,
			   DSPregs[DEST_REG].upper.f);

		*data = (ARMword) DSPregs[DEST_REG].upper.i;

		return ARMul_DONE;
	}
}

unsigned
DSPSTC5 (ARMul_State * state,
	 unsigned type, ARMword instr, ARMword * data)
{
	static unsigned words;

	if (type != ARMul_DATA) {
		words = 0;
		return ARMul_DONE;
	}

	if (BIT (22)) {
		/* It's a long access, store two words.  */
		/* cfstr64 */
		printfdbg ("cfstr64\n");

		if (words == 0) {
			if (state->bigendSig)
				*data = (ARMword) DSPregs[DEST_REG].upper.i;
			else
				*data = (ARMword) DSPregs[DEST_REG].lower.i;
		}
		else {
			if (state->bigendSig)
				*data = (ARMword) DSPregs[DEST_REG].lower.i;
			else
				*data = (ARMword) DSPregs[DEST_REG].upper.i;
		}

		++words;

		if (words == 2) {
			printfdbg ("\tmem = mvd%d = %lld\n", DEST_REG,
				   mv_getReg64int (DEST_REG));

			return ARMul_DONE;
		}
		else
			return ARMul_INC;
	}
	else {
		/* Store just one word.  */
		/* cfstr32 */
		*data = (ARMword) DSPregs[DEST_REG].lower.i;

		printfdbg ("cfstr32 MEM = %d\n", (int) *data);

		return ARMul_DONE;
	}
}

unsigned
DSPCDP4 (ARMul_State * state, unsigned type, ARMword instr)
{
	int opcode2;

	opcode2 = BITS (5, 7);

	switch (BITS (20, 21)) {
	case 0:
		switch (opcode2) {
		case 0:	/* cfcpys */
			printfdbg ("cfcpys mvf%d = mvf%d = %f\n",
				   DEST_REG, SRC1_REG,
				   DSPregs[SRC1_REG].upper.f);
			DSPregs[DEST_REG].upper.f = DSPregs[SRC1_REG].upper.f;
			break;

		case 1:	/* cfcpyd */
			printfdbg ("cfcpyd mvd%d = mvd%d = %g\n",
				   DEST_REG, SRC1_REG,
				   mv_getRegDouble (SRC1_REG));
			mv_setRegDouble (DEST_REG,
					 mv_getRegDouble (SRC1_REG));
			break;

		case 2:	/* cfcvtds */
			printfdbg ("cfcvtds mvf%d = (float) mvd%d = %f\n",
				   DEST_REG, SRC1_REG,
				   (float) mv_getRegDouble (SRC1_REG));
			DSPregs[DEST_REG].upper.f =
				(float) mv_getRegDouble (SRC1_REG);
			break;

		case 3:	/* cfcvtsd */
			printfdbg ("cfcvtsd mvd%d = mvf%d = %g\n",
				   DEST_REG, SRC1_REG,
				   (double) DSPregs[SRC1_REG].upper.f);
			mv_setRegDouble (DEST_REG,
					 (double) DSPregs[SRC1_REG].upper.f);
			break;

		case 4:	/* cfcvt32s */
			printfdbg ("cfcvt32s mvf%d = mvfx%d = %f\n",
				   DEST_REG, SRC1_REG,
				   (float) DSPregs[SRC1_REG].lower.i);
			DSPregs[DEST_REG].upper.f =
				(float) DSPregs[SRC1_REG].lower.i;
			break;

		case 5:	/* cfcvt32d */
			printfdbg ("cfcvt32d mvd%d = mvfx%d = %g\n",
				   DEST_REG, SRC1_REG,
				   (double) DSPregs[SRC1_REG].lower.i);
			mv_setRegDouble (DEST_REG,
					 (double) DSPregs[SRC1_REG].lower.i);
			break;

		case 6:	/* cfcvt64s */
			printfdbg ("cfcvt64s mvf%d = mvdx%d = %f\n",
				   DEST_REG, SRC1_REG,
				   (float) mv_getReg64int (SRC1_REG));
			DSPregs[DEST_REG].upper.f =
				(float) mv_getReg64int (SRC1_REG);
			break;

		case 7:	/* cfcvt64d */
			printfdbg ("cfcvt64d mvd%d = mvdx%d = %g\n",
				   DEST_REG, SRC1_REG,
				   (double) mv_getReg64int (SRC1_REG));
			mv_setRegDouble (DEST_REG,
					 (double) mv_getReg64int (SRC1_REG));
			break;
		}
		break;

	case 1:
		switch (opcode2) {
		case 0:	/* cfmuls */
			printfdbg ("cfmuls mvf%d = mvf%d = %f\n",
				   DEST_REG,
				   SRC1_REG,
				   DSPregs[SRC1_REG].upper.f *
				   DSPregs[SRC2_REG].upper.f);

			DSPregs[DEST_REG].upper.f = DSPregs[SRC1_REG].upper.f
				* DSPregs[SRC2_REG].upper.f;
			break;

		case 1:	/* cfmuld */
			printfdbg ("cfmuld mvd%d = mvd%d = %g\n",
				   DEST_REG,
				   SRC1_REG,
				   mv_getRegDouble (SRC1_REG) *
				   mv_getRegDouble (SRC2_REG));

			mv_setRegDouble (DEST_REG, mv_getRegDouble (SRC1_REG)
					 * mv_getRegDouble (SRC2_REG));
			break;

		default:
			fprintf (stderr, "unknown opcode in DSPCDP4 0x%x\n",
				 instr);
			cirrus_not_implemented ("unknown");
			break;
		}
		break;

	case 3:
		switch (opcode2) {
		case 0:	/* cfabss */
			DSPregs[DEST_REG].upper.f =
				(DSPregs[SRC1_REG].upper.f <
				 0.0F ? -DSPregs[SRC1_REG].upper.
				 f : DSPregs[SRC1_REG].upper.f);
			printfdbg ("cfabss mvf%d = |mvf%d| = %f\n", DEST_REG,
				   SRC1_REG, DSPregs[DEST_REG].upper.f);
			break;

		case 1:	/* cfabsd */
			mv_setRegDouble (DEST_REG,
					 (mv_getRegDouble (SRC1_REG) < 0.0 ?
					  -mv_getRegDouble (SRC1_REG)
					  : mv_getRegDouble (SRC1_REG)));
			printfdbg ("cfabsd mvd%d = |mvd%d| = %g\n",
				   DEST_REG, SRC1_REG,
				   mv_getRegDouble (DEST_REG));
			break;

		case 2:	/* cfnegs */
			DSPregs[DEST_REG].upper.f =
				-DSPregs[SRC1_REG].upper.f;
			printfdbg ("cfnegs mvf%d = -mvf%d = %f\n", DEST_REG,
				   SRC1_REG, DSPregs[DEST_REG].upper.f);
			break;

		case 3:	/* cfnegd */
			mv_setRegDouble (DEST_REG,
					 -mv_getRegDouble (SRC1_REG));
			printfdbg ("cfnegd mvd%d = -mvd%d = %g\n", DEST_REG,
				   mv_getRegDouble (DEST_REG));
			break;

		case 4:	/* cfadds */
			DSPregs[DEST_REG].upper.f = DSPregs[SRC1_REG].upper.f
				+ DSPregs[SRC2_REG].upper.f;
			printfdbg ("cfadds mvf%d = mvf%d + mvf%d = %f\n",
				   DEST_REG, SRC1_REG, SRC2_REG,
				   DSPregs[DEST_REG].upper.f);
			break;

		case 5:	/* cfaddd */
			mv_setRegDouble (DEST_REG, mv_getRegDouble (SRC1_REG)
					 + mv_getRegDouble (SRC2_REG));
			printfdbg ("cfaddd: mvd%d = mvd%d + mvd%d = %g\n",
				   DEST_REG,
				   SRC1_REG, SRC2_REG,
				   mv_getRegDouble (DEST_REG));
			break;

		case 6:	/* cfsubs */
			DSPregs[DEST_REG].upper.f = DSPregs[SRC1_REG].upper.f
				- DSPregs[SRC2_REG].upper.f;
			printfdbg ("cfsubs: mvf%d = mvf%d - mvf%d = %f\n",
				   DEST_REG, SRC1_REG, SRC2_REG,
				   DSPregs[DEST_REG].upper.f);
			break;

		case 7:	/* cfsubd */
			mv_setRegDouble (DEST_REG, mv_getRegDouble (SRC1_REG)
					 - mv_getRegDouble (SRC2_REG));
			printfdbg ("cfsubd: mvd%d = mvd%d - mvd%d = %g\n",
				   DEST_REG,
				   SRC1_REG, SRC2_REG,
				   mv_getRegDouble (DEST_REG));
			break;
		}
		break;

	default:
		fprintf (stderr, "unknown opcode in DSPCDP4 0x%x\n", instr);
		cirrus_not_implemented ("unknown");
		break;
	}

	return ARMul_DONE;
}

unsigned
DSPCDP5 (ARMul_State * state, unsigned type, ARMword instr)
{
	int opcode2;
	char shift;

	opcode2 = BITS (5, 7);

	/* Shift constants are 7bit signed numbers in bits 0..3|5..7.  */
	shift = BITS (0, 3) | (BITS (5, 7)) << 4;
	if (shift & 0x40)
		shift |= 0xc0;

	switch (BITS (20, 21)) {
	case 0:
		/* cfsh32 */
		printfdbg ("cfsh32 %s amount=%d\n",
			   shift < 0 ? "right" : "left", shift);
		if (shift < 0)
			/* Negative shift is a right shift.  */
			DSPregs[DEST_REG].lower.i =
				DSPregs[SRC1_REG].lower.i >> -shift;
		else
			/* Positive shift is a left shift.  */
			DSPregs[DEST_REG].lower.i =
				DSPregs[SRC1_REG].lower.i << shift;
		break;

	case 1:
		switch (opcode2) {
		case 0:	/* cfmul32 */
			DSPregs[DEST_REG].lower.i = DSPregs[SRC1_REG].lower.i
				* DSPregs[SRC2_REG].lower.i;
			printfdbg ("cfmul32 mvfx%d = mvfx%d * mvfx%d = %d\n",
				   DEST_REG, SRC1_REG, SRC2_REG,
				   DSPregs[DEST_REG].lower.i);
			break;

		case 1:	/* cfmul64 */
			mv_setReg64int (DEST_REG, mv_getReg64int (SRC1_REG)
					* mv_getReg64int (SRC2_REG));
			printfdbg
				("cfmul64 mvdx%d = mvdx%d * mvdx%d = %lld\n",
				 DEST_REG, SRC1_REG, SRC2_REG,
				 mv_getReg64int (DEST_REG));
			break;

		case 2:	/* cfmac32 */
			DSPregs[DEST_REG].lower.i
				+=
				DSPregs[SRC1_REG].lower.i *
				DSPregs[SRC2_REG].lower.i;
			printfdbg ("cfmac32 mvfx%d += mvfx%d * mvfx%d = %d\n",
				   DEST_REG, SRC1_REG, SRC2_REG,
				   DSPregs[DEST_REG].lower.i);
			break;

		case 3:	/* cfmsc32 */
			DSPregs[DEST_REG].lower.i
				-=
				DSPregs[SRC1_REG].lower.i *
				DSPregs[SRC2_REG].lower.i;
			printfdbg ("cfmsc32 mvfx%d -= mvfx%d * mvfx%d = %d\n",
				   DEST_REG, SRC1_REG, SRC2_REG,
				   DSPregs[DEST_REG].lower.i);
			break;

		case 4:	/* cfcvts32 */
			/* fixme: this should round */
			DSPregs[DEST_REG].lower.i =
				(int) DSPregs[SRC1_REG].upper.f;
			printfdbg ("cfcvts32 mvfx%d = mvf%d = %d\n", DEST_REG,
				   SRC1_REG, DSPregs[DEST_REG].lower.i);
			break;

		case 5:	/* cfcvtd32 */
			/* fixme: this should round */
			DSPregs[DEST_REG].lower.i =
				(int) mv_getRegDouble (SRC1_REG);
			printfdbg ("cfcvtd32 mvdx%d = mvd%d = %d\n", DEST_REG,
				   SRC1_REG, DSPregs[DEST_REG].lower.i);
			break;

		case 6:	/* cftruncs32 */
			DSPregs[DEST_REG].lower.i =
				(int) DSPregs[SRC1_REG].upper.f;
			printfdbg ("cftruncs32 mvfx%d = mvf%d = %d\n",
				   DEST_REG, SRC1_REG,
				   DSPregs[DEST_REG].lower.i);
			break;

		case 7:	/* cftruncd32 */
			DSPregs[DEST_REG].lower.i =
				(int) mv_getRegDouble (SRC1_REG);
			printfdbg ("cftruncd32 mvfx%d = mvd%d = %d\n",
				   DEST_REG, SRC1_REG,
				   DSPregs[DEST_REG].lower.i);
			break;
		}
		break;

	case 2:
		/* cfsh64 */
		printfdbg ("cfsh64\n");

		if (shift < 0)
			/* Negative shift is a right shift.  */
			mv_setReg64int (DEST_REG,
					mv_getReg64int (SRC1_REG) >> -shift);
		else
			/* Positive shift is a left shift.  */
			mv_setReg64int (DEST_REG,
					mv_getReg64int (SRC1_REG) << shift);
		printfdbg ("\t%llx\n", mv_getReg64int (DEST_REG));
		break;

	case 3:
		switch (opcode2) {
		case 0:	/* cfabs32 */
			DSPregs[DEST_REG].lower.i =
				(DSPregs[SRC1_REG].lower.i <
				 0 ? -DSPregs[SRC1_REG].lower.
				 i : DSPregs[SRC1_REG].lower.i);
			printfdbg ("cfabs32 mvfx%d = |mvfx%d| = %d\n",
				   DEST_REG, SRC1_REG, SRC2_REG,
				   DSPregs[DEST_REG].lower.i);
			break;

		case 1:	/* cfabs64 */
			mv_setReg64int (DEST_REG,
					(mv_getReg64int (SRC1_REG) < 0
					 ? -mv_getReg64int (SRC1_REG)
					 : mv_getReg64int (SRC1_REG)));
			printfdbg ("cfabs64 mvdx%d = |mvdx%d| = %lld\n",
				   DEST_REG, SRC1_REG, SRC2_REG,
				   mv_getReg64int (DEST_REG));
			break;

		case 2:	/* cfneg32 */
			DSPregs[DEST_REG].lower.i =
				-DSPregs[SRC1_REG].lower.i;
			printfdbg ("cfneg32 mvfx%d = -mvfx%d = %d\n",
				   DEST_REG, SRC1_REG, SRC2_REG,
				   DSPregs[DEST_REG].lower.i);
			break;

		case 3:	/* cfneg64 */
			mv_setReg64int (DEST_REG, -mv_getReg64int (SRC1_REG));
			printfdbg ("cfneg64 mvdx%d = -mvdx%d = %lld\n",
				   DEST_REG, SRC1_REG, SRC2_REG,
				   mv_getReg64int (DEST_REG));
			break;

		case 4:	/* cfadd32 */
			DSPregs[DEST_REG].lower.i = DSPregs[SRC1_REG].lower.i
				+ DSPregs[SRC2_REG].lower.i;
			printfdbg ("cfadd32 mvfx%d = mvfx%d + mvfx%d = %d\n",
				   DEST_REG, SRC1_REG, SRC2_REG,
				   DSPregs[DEST_REG].lower.i);
			break;

		case 5:	/* cfadd64 */
			mv_setReg64int (DEST_REG, mv_getReg64int (SRC1_REG)
					+ mv_getReg64int (SRC2_REG));
			printfdbg
				("cfadd64 mvdx%d = mvdx%d + mvdx%d = %lld\n",
				 DEST_REG, SRC1_REG, SRC2_REG,
				 mv_getReg64int (DEST_REG));
			break;

		case 6:	/* cfsub32 */
			DSPregs[DEST_REG].lower.i = DSPregs[SRC1_REG].lower.i
				- DSPregs[SRC2_REG].lower.i;
			printfdbg ("cfsub32 mvfx%d = mvfx%d - mvfx%d = %d\n",
				   DEST_REG, SRC1_REG, SRC2_REG,
				   DSPregs[DEST_REG].lower.i);
			break;

		case 7:	/* cfsub64 */
			mv_setReg64int (DEST_REG, mv_getReg64int (SRC1_REG)
					- mv_getReg64int (SRC2_REG));
			printfdbg ("cfsub64 mvdx%d = mvdx%d - mvdx%d = %d\n",
				   DEST_REG, SRC1_REG, SRC2_REG,
				   mv_getReg64int (DEST_REG));
			break;
		}
		break;

	default:
		fprintf (stderr, "unknown opcode in DSPCDP5 0x%x\n", instr);
		cirrus_not_implemented ("unknown");
		break;
	}

	return ARMul_DONE;
}

unsigned
DSPCDP6 (ARMul_State * state, unsigned type, ARMword instr)
{
	int opcode2;

	opcode2 = BITS (5, 7);

	switch (BITS (20, 21)) {
	case 0:
		/* cfmadd32 */
		cirrus_not_implemented ("cfmadd32");
		break;

	case 1:
		/* cfmsub32 */
		cirrus_not_implemented ("cfmsub32");
		break;

	case 2:
		/* cfmadda32 */
		cirrus_not_implemented ("cfmadda32");
		break;

	case 3:
		/* cfmsuba32 */
		cirrus_not_implemented ("cfmsuba32");
		break;

	default:
		fprintf (stderr, "unknown opcode in DSPCDP6 0x%x\n", instr);
	}

	return ARMul_DONE;
}

/* Conversion functions.

   32-bit integers are stored in the LOWER half of a 64-bit physical
   register.

   Single precision floats are stored in the UPPER half of a 64-bit
   physical register.  */

static double
mv_getRegDouble (int regnum)
{
	reg_conv.ints[lsw_float_index] = DSPregs[regnum].upper.i;
	reg_conv.ints[msw_float_index] = DSPregs[regnum].lower.i;
	return reg_conv.d;
}

static void
mv_setRegDouble (int regnum, double val)
{
	reg_conv.d = val;
	DSPregs[regnum].upper.i = reg_conv.ints[lsw_float_index];
	DSPregs[regnum].lower.i = reg_conv.ints[msw_float_index];
}

static long long
mv_getReg64int (int regnum)
{
	reg_conv.ints[lsw_int_index] = DSPregs[regnum].lower.i;
	reg_conv.ints[msw_int_index] = DSPregs[regnum].upper.i;
	return reg_conv.ll;
}

static void
mv_setReg64int (int regnum, long long val)
{
	reg_conv.ll = val;
	DSPregs[regnum].lower.i = reg_conv.ints[lsw_int_index];
	DSPregs[regnum].upper.i = reg_conv.ints[msw_int_index];
}

/* Compute LSW in a double and a long long.  */

void
mv_compute_host_endianness (ARMul_State * state)
{
	static union
	{
		long long ll;
		int ints[2];
		int i;
		double d;
		float floats[2];
		float f;
	} conv;

	/* Calculate where's the LSW in a 64bit int.  */
	conv.ll = 45;

	if (conv.ints[0] == 0) {
		msw_int_index = 0;
		lsw_int_index = 1;
	}
	else {
		assert (conv.ints[1] == 0);
		msw_int_index = 1;
		lsw_int_index = 0;
	}

	/* Calculate where's the LSW in a double.  */
	conv.d = 3.0;

	if (conv.ints[0] == 0) {
		msw_float_index = 0;
		lsw_float_index = 1;
	}
	else {
		assert (conv.ints[1] == 0);
		msw_float_index = 1;
		lsw_float_index = 0;
	}

	printfdbg ("lsw_int_index   %d\n", lsw_int_index);
	printfdbg ("lsw_float_index %d\n", lsw_float_index);
}