path: root/opcodes/rx-decode.opc

/* -*- c -*- */
/* Copyright (C) 2012-2018 Free Software Foundation, Inc.
   Contributed by Red Hat.
   Written by DJ Delorie.

   This file is part of the GNU opcodes library.

   This library 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 3, or (at your option)
   any later version.

   It 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., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */

#include "sysdep.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ansidecl.h"
#include "opcode/rx.h"
#include "libiberty.h"

#define RX_OPCODE_BIG_ENDIAN 0

typedef struct
{
  RX_Opcode_Decoded * rx;
  int (* getbyte)(void *);
  void * ptr;
  unsigned char * op;
} LocalData;

static int trace = 0;

#define BSIZE 0
#define WSIZE 1
#define LSIZE 2

/* These are for when the upper bits are "don't care" or "undefined".  */
static int bwl[4] =
{
  RX_Byte,
  RX_Word,
  RX_Long,
  RX_Bad_Size /* Bogus instructions can have a size field set to 3.  */
};

static int sbwl[4] =
{
  RX_SByte,
  RX_SWord,
  RX_Long,
  RX_Bad_Size /* Bogus instructions can have a size field set to 3.  */
};

static int ubw[4] =
{
  RX_UByte,
  RX_UWord,
  RX_Bad_Size,/* Bogus instructions can have a size field set to 2.  */
  RX_Bad_Size /* Bogus instructions can have a size field set to 3.  */
};

static int memex[4] =
{
  RX_SByte,
  RX_SWord,
  RX_Long,
  RX_UWord
};

#define ID(x) rx->id = RXO_##x
#define OP(n,t,r,a) (rx->op[n].type = t, \
		     rx->op[n].reg = r,	     \
		     rx->op[n].addend = a )
#define OPs(n,t,r,a,s) (OP (n,t,r,a), \
			rx->op[n].size = s )

/* This is for the BWL and BW bitfields.  */
static int SCALE[] = { 1, 2, 4, 0 };
/* This is for the prefix size enum.  */
static int PSCALE[] = { 4, 1, 1, 1, 2, 2, 2, 3, 4 };

#define GET_SCALE(_indx)  ((unsigned)(_indx) < ARRAY_SIZE (SCALE) ? SCALE[(_indx)] : 0)
#define GET_PSCALE(_indx) ((unsigned)(_indx) < ARRAY_SIZE (PSCALE) ? PSCALE[(_indx)] : 0)

static int flagmap[] = {0, 1, 2, 3, 0, 0, 0, 0,
		       16, 17, 0, 0, 0, 0, 0, 0 };

static int dsp3map[] = { 8, 9, 10, 3, 4, 5, 6, 7 };

/*
 *C	a constant (immediate) c
 *R	A register
 *I	Register indirect, no offset
 *Is	Register indirect, with offset
 *D	standard displacement: type (r,[r],dsp8,dsp16 code), register, BWL code
 *P	standard displacement: type (r,[r]), reg, assumes UByte
 *Pm	memex displacement: type (r,[r]), reg, memex code
 *cc	condition code.  */

#define DC(c)       OP (0, RX_Operand_Immediate, 0, c)
#define DR(r)       OP (0, RX_Operand_Register,  r, 0)
#define DI(r,a)     OP (0, RX_Operand_Indirect,  r, a)
#define DIs(r,a,s)  OP (0, RX_Operand_Indirect,  r, (a) * GET_SCALE (s))
#define DD(t,r,s)   rx_disp (0, t, r, bwl[s], ld);
#define DF(r)       OP (0, RX_Operand_Flag,  flagmap[r], 0)

#define SC(i)       OP (1, RX_Operand_Immediate, 0, i)
#define SR(r)       OP (1, RX_Operand_Register,  r, 0)
#define SRR(r)      OP (1, RX_Operand_TwoReg,  r, 0)
#define SI(r,a)     OP (1, RX_Operand_Indirect,  r, a)
#define SIs(r,a,s)  OP (1, RX_Operand_Indirect,  r, (a) * GET_SCALE (s))
#define SD(t,r,s)   rx_disp (1, t, r, bwl[s], ld);
#define SP(t,r)     rx_disp (1, t, r, (t!=3) ? RX_UByte : RX_Long, ld); P(t, 1);
#define SPm(t,r,m)  rx_disp (1, t, r, memex[m], ld); rx->op[1].size = memex[m];
#define Scc(cc)     OP (1, RX_Operand_Condition,  cc, 0)

#define S2C(i)      OP (2, RX_Operand_Immediate, 0, i)
#define S2R(r)      OP (2, RX_Operand_Register,  r, 0)
#define S2I(r,a)    OP (2, RX_Operand_Indirect,  r, a)
#define S2Is(r,a,s) OP (2, RX_Operand_Indirect,  r, (a) * GET_SCALE (s))
#define S2D(t,r,s)  rx_disp (2, t, r, bwl[s], ld);
#define S2P(t,r)    rx_disp (2, t, r, (t!=3) ? RX_UByte : RX_Long, ld); P(t, 2);
#define S2Pm(t,r,m) rx_disp (2, t, r, memex[m], ld); rx->op[2].size = memex[m];
#define S2cc(cc)    OP (2, RX_Operand_Condition,  cc, 0)

#define BWL(sz)     rx->op[0].size = rx->op[1].size = rx->op[2].size = rx->size = bwl[sz]
#define sBWL(sz)    rx->op[0].size = rx->op[1].size = rx->op[2].size = rx->size = sbwl[sz]
#define uBW(sz)     rx->op[0].size = rx->op[1].size = rx->op[2].size = rx->size = ubw[sz]
#define P(t, n)	    rx->op[n].size = (t!=3) ? RX_UByte : RX_Long;

#define F(f) store_flags(rx, f)

#define AU ATTRIBUTE_UNUSED
#define GETBYTE() (ld->op [ld->rx->n_bytes++] = ld->getbyte (ld->ptr))

#define SYNTAX(x) rx->syntax = x

#define UNSUPPORTED() \
  rx->syntax = "*unknown*"

#define IMM(sf)   immediate (sf, 0, ld)
#define IMMex(sf) immediate (sf, 1, ld)

static int
immediate (int sfield, int ex, LocalData * ld)
{
  unsigned long i = 0, j;

  switch (sfield)
    {
#define B ((unsigned long) GETBYTE())
    case 0:
#if RX_OPCODE_BIG_ENDIAN
      i  = B;
      if (ex && (i & 0x80))
	i -= 0x100;
      i <<= 24;
      i |= B << 16;
      i |= B << 8;
      i |= B;
#else
      i = B;
      i |= B << 8;
      i |= B << 16;
      j = B;
      if (ex && (j & 0x80))
	j -= 0x100;
      i |= j << 24;
#endif
      break;
    case 3:
#if RX_OPCODE_BIG_ENDIAN
      i  = B << 16;
      i |= B << 8;
      i |= B;
#else
      i  = B;
      i |= B << 8;
      i |= B << 16;
#endif
      if (ex && (i & 0x800000))
	i -= 0x1000000;
      break;
    case 2:
#if RX_OPCODE_BIG_ENDIAN
      i |= B << 8;
      i |= B;
#else
      i |= B;
      i |= B << 8;
#endif
      if (ex && (i & 0x8000))
	i -= 0x10000;
      break;
    case 1:
      i |= B;
      if (ex && (i & 0x80))
	i -= 0x100;
      break;
    default:
      abort();
    }
  return i;
}

static void
rx_disp (int n, int type, int reg, unsigned int size, LocalData * ld)
{
  int disp;

  ld->rx->op[n].reg = reg;
  switch (type)
    {
    case 3:
      ld->rx->op[n].type = RX_Operand_Register;
      break;
    case 0:
      ld->rx->op[n].type = RX_Operand_Zero_Indirect;
      ld->rx->op[n].addend = 0;
      break;
    case 1:
      ld->rx->op[n].type = RX_Operand_Indirect;
      disp = GETBYTE ();
      ld->rx->op[n].addend = disp * GET_PSCALE (size);
      break;
    case 2:
      ld->rx->op[n].type = RX_Operand_Indirect;
      disp = GETBYTE ();
#if RX_OPCODE_BIG_ENDIAN
      disp = disp * 256 + GETBYTE ();
#else
      disp = disp + GETBYTE () * 256;
#endif
      ld->rx->op[n].addend = disp * GET_PSCALE (size);
      break;
    default:
      abort ();
    }
}

#define xO 8
#define xS 4
#define xZ 2
#define xC 1

#define F_____
#define F___ZC rx->flags_0 = rx->flags_s = xZ|xC;
#define F__SZ_ rx->flags_0 = rx->flags_s = xS|xZ;
#define F__SZC rx->flags_0 = rx->flags_s = xS|xZ|xC;
#define F_0SZC rx->flags_0 = xO|xS|xZ|xC; rx->flags_s = xS|xZ|xC;
#define F_O___ rx->flags_0 = rx->flags_s = xO;
#define F_OS__ rx->flags_0 = rx->flags_s = xO|xS;
#define F_OSZ_ rx->flags_0 = rx->flags_s = xO|xS|xZ;
#define F_OSZC rx->flags_0 = rx->flags_s = xO|xS|xZ|xC;

int
rx_decode_opcode (unsigned long pc AU,
		  RX_Opcode_Decoded * rx,
		  int (* getbyte)(void *),
		  void * ptr)
{
  LocalData lds, * ld = &lds;
  unsigned char op[20] = {0};

  lds.rx = rx;
  lds.getbyte = getbyte;
  lds.ptr = ptr;
  lds.op = op;

  memset (rx, 0, sizeof (*rx));
  BWL(LSIZE);

/** VARY sz 00 01 10 */

/*----------------------------------------------------------------------*/
/* MOV									*/

/** 0111 0101 0100 rdst		mov%s	#%1, %0 */
  ID(mov); DR(rdst); SC(IMM (1)); F_____;

/** 1111 10sd rdst im sz	mov%s	#%1, %0 */
  ID(mov); DD(sd, rdst, sz);
  if ((im == 1 && sz == 0)
      || (im == 2 && sz == 1)
      || (im == 0 && sz == 2))
    {
      BWL (sz);
      SC(IMM(im));
    }
  else
    {
      sBWL (sz);
      SC(IMMex(im));
    }
   F_____;

/** 0110 0110 immm rdst		mov%s	#%1, %0 */
  ID(mov); DR(rdst); SC(immm); F_____;

/** 0011 11sz d dst sppp		mov%s	#%1, %0 */
  ID(mov); sBWL (sz); DIs(dst, d*16+sppp, sz); SC(IMM(1)); F_____;

/** 11sz sd ss rsrc rdst	mov%s	%1, %0 */
  if (sd == 3 && ss == 3 && sz == 2 && rsrc == 0 && rdst == 0)
    {
      ID(nop2);
      SYNTAX ("nop\t; mov.l\tr0, r0");
    }
  else
    {
      ID(mov); sBWL(sz); F_____;
      if ((ss == 3) && (sd != 3))
	{
	  SD(ss, rdst, sz); DD(sd, rsrc, sz);
	}
      else
	{
	  SD(ss, rsrc, sz); DD(sd, rdst, sz);
	}
    }

/** 10sz 1dsp a src b dst	mov%s	%1, %0 */
  ID(mov); sBWL(sz); DR(dst); SIs(src, dsp*4+a*2+b, sz); F_____;

/** 10sz 0dsp a dst b src	mov%s	%1, %0 */
  ID(mov); sBWL(sz); DIs(dst, dsp*4+a*2+b, sz); SR(src); F_____;

/** 1111 1110 01sz isrc bsrc rdst	mov%s	[%1, %2], %0 */
  ID(movbi); sBWL(sz); DR(rdst); SRR(isrc); S2R(bsrc); F_____;

/** 1111 1110 00sz isrc bsrc rdst	mov%s	%0, [%1, %2] */
  ID(movbir); sBWL(sz); DR(rdst); SRR(isrc); S2R(bsrc); F_____;

/** 1111 1110 11sz isrc bsrc rdst	movu%s	[%1, %2], %0 */
  ID(movbi); uBW(sz); DR(rdst); SRR(isrc); S2R(bsrc); F_____;

/** 1111 1101 0010 0p sz rdst rsrc	mov%s	%1, %0 */
  ID(mov); sBWL (sz); SR(rsrc); F_____;
  OP(0, p ? RX_Operand_Predec : RX_Operand_Postinc, rdst, 0);

/** 1111 1101 0010 1p sz rsrc rdst	mov%s	%1, %0 */
  ID(mov); sBWL (sz); DR(rdst); F_____;
  OP(1, p ? RX_Operand_Predec : RX_Operand_Postinc, rsrc, 0);

/** 1011 w dsp a src b dst	movu%s	%1, %0 */
  ID(mov); uBW(w); DR(dst); SIs(src, dsp*4+a*2+b, w); F_____;

/** 0101 1 s ss rsrc rdst	movu%s	%1, %0 */
  ID(mov); uBW(s); SD(ss, rsrc, s); DR(rdst); F_____;

/** 1111 1101 0011 1p sz rsrc rdst	movu%s	%1, %0 */
  ID(mov); uBW (sz); DR(rdst); F_____;
   OP(1, p ? RX_Operand_Predec : RX_Operand_Postinc, rsrc, 0);

/*----------------------------------------------------------------------*/
/* PUSH/POP								*/

/** 0110 1111 dsta dstb		popm	%1-%2 */
  ID(popm); SR(dsta); S2R(dstb); F_____;

/** 0110 1110 dsta dstb		pushm	%1-%2 */
  ID(pushm); SR(dsta); S2R(dstb); F_____;

/** 0111 1110 1011 rdst		pop	%0 */
  ID(mov); OP(1, RX_Operand_Postinc, 0, 0); DR(rdst); F_____;

/** 0111 1110 10sz rsrc		push%s	%1 */
  ID(mov); BWL(sz); OP(0, RX_Operand_Predec, 0, 0); SR(rsrc); F_____;

/** 1111 01ss rsrc 10sz		push%s	%1 */
  ID(mov); BWL(sz); OP(0, RX_Operand_Predec, 0, 0); SD(ss, rsrc, sz); F_____;

/*----------------------------------------------------------------------*/
/* XCHG									*/

/** 1111 1100 0100 00ss rsrc rdst	xchg	%1%S1, %0 */
  ID(xchg); DR(rdst); SP(ss, rsrc);

/** 0000 0110 mx10 00ss 0001 0000 rsrc rdst	xchg	%1%S1, %0 */
  ID(xchg); DR(rdst); SPm(ss, rsrc, mx);

/*----------------------------------------------------------------------*/
/* STZ/STNZ								*/

/** 1111 1101 0111 im00 1110rdst	stz	#%1, %0 */
  ID(stcc); SC(IMMex(im)); DR(rdst); S2cc(RXC_z);

/** 1111 1101 0111 im00 1111rdst	stnz	#%1, %0 */
  ID(stcc); SC(IMMex(im)); DR(rdst); S2cc(RXC_nz);

/*----------------------------------------------------------------------*/
/* RTSD									*/

/** 0110 0111			rtsd	#%1 */
  ID(rtsd); SC(IMM(1) * 4);

/** 0011 1111 rega regb		rtsd	#%1, %2-%0 */
  ID(rtsd); SC(IMM(1) * 4); S2R(rega); DR(regb);

/*----------------------------------------------------------------------*/
/* AND									*/

/** 0110 0100 immm rdst			and	#%1, %0 */
  ID(and); SC(immm); DR(rdst); F__SZ_;

/** 0111 01im 0010 rdst			and	#%1, %0 */
  ID(and); SC(IMMex(im)); DR(rdst); F__SZ_;

/** 0101 00ss rsrc rdst			and	%1%S1, %0 */
  ID(and); SP(ss, rsrc); DR(rdst); F__SZ_;

/** 0000 0110 mx01 00ss rsrc rdst	and	%1%S1, %0 */
  ID(and); SPm(ss, rsrc, mx); DR(rdst); F__SZ_;

/** 1111 1111 0100 rdst srca srcb	and	%2, %1, %0 */
  ID(and); DR(rdst); SR(srcb); S2R(srca); F__SZ_;

/*----------------------------------------------------------------------*/
/* OR									*/

/** 0110 0101 immm rdst			or	#%1, %0 */
  ID(or); SC(immm); DR(rdst); F__SZ_;

/** 0111 01im 0011 rdst			or	#%1, %0 */
  ID(or); SC(IMMex(im)); DR(rdst); F__SZ_;

/** 0101 01ss rsrc rdst			or	%1%S1, %0 */
  ID(or); SP(ss, rsrc); DR(rdst); F__SZ_;

/** 0000 0110 mx01 01ss rsrc rdst			or	%1%S1, %0 */
  ID(or); SPm(ss, rsrc, mx); DR(rdst); F__SZ_;

/** 1111 1111 0101 rdst srca srcb	or	%2, %1, %0 */
  ID(or); DR(rdst); SR(srcb); S2R(srca); F__SZ_;

/*----------------------------------------------------------------------*/
/* XOR									*/

/** 1111 1101 0111 im00 1101rdst	xor	#%1, %0 */
  ID(xor); SC(IMMex(im)); DR(rdst); F__SZ_;

/** 1111 1100 0011 01ss rsrc rdst	xor	%1%S1, %0 */
  ID(xor); SP(ss, rsrc); DR(rdst); F__SZ_;

/** 0000 0110 mx10 00ss 0000 1101 rsrc rdst	xor	%1%S1, %0 */
  ID(xor); SPm(ss, rsrc, mx); DR(rdst); F__SZ_;

/*----------------------------------------------------------------------*/
/* NOT									*/

/** 0111 1110 0000 rdst			not	%0 */
  ID(xor); DR(rdst); SR(rdst); S2C(~0); F__SZ_;

/** 1111 1100 0011 1011 rsrc rdst	not	%1, %0 */
  ID(xor); DR(rdst); SR(rsrc); S2C(~0); F__SZ_;

/*----------------------------------------------------------------------*/
/* TST									*/

/** 1111 1101 0111 im00 1100rdst	tst	#%1, %2 */
  ID(and); SC(IMMex(im)); S2R(rdst); F__SZ_;

/** 1111 1100 0011 00ss rsrc rdst	tst	%1%S1, %2 */
  ID(and); SP(ss, rsrc); S2R(rdst); F__SZ_;

/** 0000 0110 mx10 00ss 0000 1100 rsrc rdst	tst	%1%S1, %2 */
  ID(and); SPm(ss, rsrc, mx); S2R(rdst); F__SZ_;

/*----------------------------------------------------------------------*/
/* NEG									*/

/** 0111 1110 0001 rdst			neg	%0 */
  ID(sub); DR(rdst); SC(0); S2R(rdst); F_OSZC;

/** 1111 1100 0000 0111 rsrc rdst	neg	%2, %0 */
  ID(sub); DR(rdst); SC(0); S2R(rsrc); F_OSZC;

/*----------------------------------------------------------------------*/
/* ADC									*/

/** 1111 1101 0111 im00 0010rdst	adc	#%1, %0 */
  ID(adc); SC(IMMex(im)); DR(rdst); F_OSZC;

/** 1111 1100 0000 1011 rsrc rdst	adc	%1, %0 */
  ID(adc); SR(rsrc); DR(rdst); F_OSZC;

/** 0000 0110 1010 00ss 0000 0010 rsrc rdst	adc	%1%S1, %0 */
  ID(adc); SPm(ss, rsrc, 2); DR(rdst); F_OSZC;

/*----------------------------------------------------------------------*/
/* ADD									*/

/** 0110 0010 immm rdst			add	#%1, %0 */
  ID(add); SC(immm); DR(rdst); F_OSZC;

/** 0100 10ss rsrc rdst			add	%1%S1, %0 */
  ID(add); SP(ss, rsrc); DR(rdst); F_OSZC;

/** 0000 0110 mx00 10ss rsrc rdst	add	%1%S1, %0 */
  ID(add); SPm(ss, rsrc, mx); DR(rdst); F_OSZC;

/** 0111 00im rsrc rdst			add	#%1, %2, %0 */
  ID(add); SC(IMMex(im)); S2R(rsrc); DR(rdst); F_OSZC;

/** 1111 1111 0010 rdst srca srcb	add	%2, %1, %0 */
  ID(add); DR(rdst); SR(srcb); S2R(srca); F_OSZC;

/*----------------------------------------------------------------------*/
/* CMP									*/

/** 0110 0001 immm rdst			cmp	#%2, %1 */
  ID(sub); S2C(immm); SR(rdst); F_OSZC;

/** 0111 01im 0000 rsrc		cmp	#%2, %1%S1 */
  ID(sub); SR(rsrc); S2C(IMMex(im)); F_OSZC;

/** 0111 0101 0101 rsrc			cmp	#%2, %1 */
  ID(sub); SR(rsrc); S2C(IMM(1)); F_OSZC;

/** 0100 01ss rsrc rdst		cmp	%2%S2, %1 */
  ID(sub); S2P(ss, rsrc); SR(rdst); F_OSZC;

/** 0000 0110 mx00 01ss rsrc rdst		cmp	%2%S2, %1 */
  ID(sub); S2Pm(ss, rsrc, mx); SR(rdst); F_OSZC;

/*----------------------------------------------------------------------*/
/* SUB									*/

/** 0110 0000 immm rdst			sub	#%2, %0 */
  ID(sub); S2C(immm); SR(rdst); DR(rdst); F_OSZC;

/** 0100 00ss rsrc rdst			sub	%2%S2, %1 */
  ID(sub); S2P(ss, rsrc); SR(rdst); DR(rdst); F_OSZC;

/** 0000 0110 mx00 00ss rsrc rdst			sub	%2%S2, %1 */
  ID(sub); S2Pm(ss, rsrc, mx); SR(rdst); DR(rdst); F_OSZC;

/** 1111 1111 0000 rdst srca srcb	sub	%2, %1, %0 */
  ID(sub); DR(rdst); SR(srcb); S2R(srca); F_OSZC;

/*----------------------------------------------------------------------*/
/* SBB									*/

/** 1111 1100 0000 0011 rsrc rdst	sbb	%1, %0 */
  ID(sbb); SR (rsrc); DR(rdst); F_OSZC;

  /* FIXME: only supports .L */
/** 0000 0110 mx10 00sp 0000 0000 rsrc rdst	sbb	%1%S1, %0 */
  ID(sbb); SPm(sp, rsrc, mx); DR(rdst); F_OSZC;

/*----------------------------------------------------------------------*/
/* ABS									*/

/** 0111 1110 0010 rdst			abs	%0 */
  ID(abs); DR(rdst); SR(rdst); F_OSZ_;

/** 1111 1100 0000 1111 rsrc rdst	abs	%1, %0 */
  ID(abs); DR(rdst); SR(rsrc); F_OSZ_;

/*----------------------------------------------------------------------*/
/* MAX									*/

/** 1111 1101 0111 im00 0100rdst	max	#%1, %0 */
  int val = IMMex (im);
  if (im == 0 && (unsigned) val == 0x80000000 && rdst == 0)
    {
      ID (nop7);
      SYNTAX("nop\t; max\t#0x80000000, r0");
    }
  else
    {
      ID(max);
    }
  DR(rdst); SC(val);

/** 1111 1100 0001 00ss rsrc rdst	max	%1%S1, %0 */
  if (ss == 3 && rsrc == 0 && rdst == 0)
    {
      ID(nop3);
      SYNTAX("nop\t; max\tr0, r0");
    }
  else
    {
      ID(max); SP(ss, rsrc); DR(rdst);
    }

/** 0000 0110 mx10 00ss 0000 0100 rsrc rdst	max	%1%S1, %0 */
  ID(max); SPm(ss, rsrc, mx); DR(rdst);

/*----------------------------------------------------------------------*/
/* MIN									*/

/** 1111 1101 0111 im00 0101rdst	min	#%1, %0 */
  ID(min); DR(rdst); SC(IMMex(im));

/** 1111 1100 0001 01ss rsrc rdst	min	%1%S1, %0 */
  ID(min); SP(ss, rsrc); DR(rdst);

/** 0000 0110 mx10 00ss 0000 0101 rsrc rdst	min	%1%S1, %0 */
  ID(min); SPm(ss, rsrc, mx); DR(rdst);

/*----------------------------------------------------------------------*/
/* MUL									*/

/** 0110 0011 immm rdst			mul	#%1, %0 */
  if (immm == 1 && rdst == 0)
    {
      ID(nop2);
      SYNTAX ("nop\t; mul\t#1, r0");
    }
  else
    {
      ID(mul);
    }
  DR(rdst); SC(immm); F_____;

/** 0111 01im 0001rdst			mul	#%1, %0 */
  int val = IMMex(im);
  if (val == 1 && rdst == 0)
    {
      SYNTAX("nop\t; mul\t#1, r0");
      switch (im)
	{
	case 2: ID(nop4); break;
	case 3: ID(nop5); break;
	case 0: ID(nop6); break;
	default:
	  ID(mul);
	  SYNTAX("mul	#%1, %0");
	  break;
	}
    }
  else
    {
      ID(mul);
    }
  DR(rdst); SC(val); F_____;

/** 0100 11ss rsrc rdst			mul	%1%S1, %0 */
  ID(mul); SP(ss, rsrc); DR(rdst); F_____;

/** 0000 0110 mx00 11ss rsrc rdst	mul	%1%S1, %0 */
  ID(mul); SPm(ss, rsrc, mx); DR(rdst); F_____;

/** 1111 1111 0011 rdst srca srcb	mul 	%2, %1, %0 */
  ID(mul); DR(rdst); SR(srcb); S2R(srca); F_____;

/*----------------------------------------------------------------------*/
/* EMUL									*/

/** 1111 1101 0111 im00 0110rdst	emul	#%1, %0 */
  ID(emul); DR(rdst); SC(IMMex(im));

/** 1111 1100 0001 10ss rsrc rdst	emul	%1%S1, %0 */
  ID(emul); SP(ss, rsrc); DR(rdst);

/** 0000 0110 mx10 00ss 0000 0110 rsrc rdst	emul	%1%S1, %0 */
  ID(emul); SPm(ss, rsrc, mx); DR(rdst);

/*----------------------------------------------------------------------*/
/* EMULU									*/

/** 1111 1101 0111 im00 0111rdst	emulu	#%1, %0 */
  ID(emulu); DR(rdst); SC(IMMex(im));

/** 1111 1100 0001 11ss rsrc rdst	emulu	%1%S1, %0 */
  ID(emulu); SP(ss, rsrc); DR(rdst);

/** 0000 0110 mx10 00ss 0000 0111 rsrc rdst	emulu	%1%S1, %0 */
  ID(emulu); SPm(ss, rsrc, mx); DR(rdst);

/*----------------------------------------------------------------------*/
/* DIV									*/

/** 1111 1101 0111 im00 1000rdst	div	#%1, %0 */
  ID(div); DR(rdst); SC(IMMex(im)); F_O___;

/** 1111 1100 0010 00ss rsrc rdst	div	%1%S1, %0 */
  ID(div); SP(ss, rsrc); DR(rdst); F_O___;

/** 0000 0110 mx10 00ss 0000 1000 rsrc rdst	div	%1%S1, %0 */
  ID(div); SPm(ss, rsrc, mx); DR(rdst); F_O___;

/*----------------------------------------------------------------------*/
/* DIVU									*/

/** 1111 1101 0111 im00 1001rdst	divu	#%1, %0 */
  ID(divu); DR(rdst); SC(IMMex(im)); F_O___;

/** 1111 1100 0010 01ss rsrc rdst	divu	%1%S1, %0 */
  ID(divu); SP(ss, rsrc); DR(rdst); F_O___;

/** 0000 0110 mx10 00ss 0000 1001 rsrc rdst	divu	%1%S1, %0 */
  ID(divu); SPm(ss, rsrc, mx); DR(rdst); F_O___;

/*----------------------------------------------------------------------*/
/* SHIFT								*/

/** 0110 110i mmmm rdst			shll	#%2, %0 */
  ID(shll); S2C(i*16+mmmm); SR(rdst); DR(rdst); F_OSZC;

/** 1111 1101 0110 0010 rsrc rdst	shll	%2, %0 */
  ID(shll); S2R(rsrc); SR(rdst); DR(rdst); F_OSZC;

/** 1111 1101 110immmm rsrc rdst	shll	#%2, %1, %0 */
  ID(shll); S2C(immmm); SR(rsrc); DR(rdst); F_OSZC;


/** 0110 101i mmmm rdst			shar	#%2, %0 */
  ID(shar); S2C(i*16+mmmm); SR(rdst); DR(rdst); F_0SZC;

/** 1111 1101 0110 0001 rsrc rdst	shar	%2, %0 */
  ID(shar); S2R(rsrc); SR(rdst); DR(rdst); F_0SZC;

/** 1111 1101 101immmm rsrc rdst	shar	#%2, %1, %0 */
  ID(shar); S2C(immmm); SR(rsrc); DR(rdst); F_0SZC;


/** 0110 100i mmmm rdst			shlr	#%2, %0 */
  ID(shlr); S2C(i*16+mmmm); SR(rdst); DR(rdst); F__SZC;

/** 1111 1101 0110 0000 rsrc rdst	shlr	%2, %0 */
  ID(shlr); S2R(rsrc); SR(rdst); DR(rdst); F__SZC;

/** 1111 1101 100immmm rsrc rdst	shlr	#%2, %1, %0 */
  ID(shlr); S2C(immmm); SR(rsrc); DR(rdst); F__SZC;

/*----------------------------------------------------------------------*/
/* ROTATE								*/

/** 0111 1110 0101 rdst			rolc	%0 */
  ID(rolc); DR(rdst); F__SZC;

/** 0111 1110 0100 rdst			rorc	%0 */
  ID(rorc); DR(rdst); F__SZC;

/** 1111 1101 0110 111i mmmm rdst	rotl	#%1, %0 */
  ID(rotl); SC(i*16+mmmm); DR(rdst); F__SZC;

/** 1111 1101 0110 0110 rsrc rdst	rotl	%1, %0 */
  ID(rotl); SR(rsrc); DR(rdst); F__SZC;

/** 1111 1101 0110 110i mmmm rdst	rotr	#%1, %0 */
  ID(rotr); SC(i*16+mmmm); DR(rdst); F__SZC;

/** 1111 1101 0110 0100 rsrc rdst	rotr	%1, %0 */
  ID(rotr); SR(rsrc); DR(rdst); F__SZC;

/** 1111 1101 0110 0101 rsrc rdst	revw	%1, %0 */
  ID(revw); SR(rsrc); DR(rdst);

/** 1111 1101 0110 0111 rsrc rdst	revl	%1, %0 */
  ID(revl); SR(rsrc); DR(rdst);

/*----------------------------------------------------------------------*/
/* BRANCH								*/

/** 0001 n dsp			b%1.s	%a0 */
  ID(branch); Scc(n); DC(pc + dsp3map[dsp]);

/** 0010 cond			b%1.b	%a0 */
  ID(branch); Scc(cond); DC(pc + IMMex (1));

/** 0011 101c			b%1.w	%a0 */
  ID(branch); Scc(c); DC(pc + IMMex (2));


/** 0000 1dsp			bra.s	%a0 */
  ID(branch); DC(pc + dsp3map[dsp]);

/** 0010 1110			bra.b	%a0 */
  ID(branch); DC(pc + IMMex(1));

/** 0011 1000			bra.w	%a0 */
  ID(branch); DC(pc + IMMex(2));

/** 0000 0100			bra.a	%a0 */
  ID(branch); DC(pc + IMMex(3));

/** 0111 1111 0100 rsrc		bra.l	%0 */
  ID(branchrel); DR(rsrc);


/** 0111 1111 0000 rsrc		jmp	%0 */
  ID(branch); DR(rsrc);

/** 0111 1111 0001 rsrc		jsr	%0 */
  ID(jsr); DR(rsrc);

/** 0011 1001			bsr.w	%a0 */
  ID(jsr); DC(pc + IMMex(2));

/** 0000 0101			bsr.a	%a0 */
  ID(jsr); DC(pc + IMMex(3));

/** 0111 1111 0101 rsrc		bsr.l	%0 */
  ID(jsrrel); DR(rsrc);

/** 0000 0010			rts */
  ID(rts);

/*----------------------------------------------------------------------*/
/* NOP								*/

/** 0000 0011			nop */
  ID(nop);

/*----------------------------------------------------------------------*/
/* STRING FUNCTIONS							*/

/** 0111 1111 1000 0011		scmpu */
  ID(scmpu); F___ZC;

/** 0111 1111 1000 0111		smovu */
  ID(smovu);

/** 0111 1111 1000 1011		smovb */
  ID(smovb);

/** 0111 1111 1000 00sz		suntil%s */
  ID(suntil); BWL(sz); F___ZC;

/** 0111 1111 1000 01sz		swhile%s */
  ID(swhile); BWL(sz); F___ZC;

/** 0111 1111 1000 1111		smovf */
  ID(smovf);

/** 0111 1111 1000 10sz		sstr%s */
  ID(sstr); BWL(sz);

/*----------------------------------------------------------------------*/
/* RMPA									*/

/** 0111 1111 1000 11sz		rmpa%s */
  ID(rmpa); BWL(sz); F_OS__;

/*----------------------------------------------------------------------*/
/* HI/LO stuff								*/

/** 1111 1101 0000 a000 srca srcb	mulhi	%1, %2, %0 */
  ID(mulhi); DR(a+32); SR(srca); S2R(srcb); F_____;

/** 1111 1101 0000 a001 srca srcb	mullo	%1, %2, %0 */
  ID(mullo); DR(a+32); SR(srca); S2R(srcb); F_____;

/** 1111 1101 0000 a100 srca srcb	machi	%1, %2, %0 */
  ID(machi); DR(a+32); SR(srca); S2R(srcb); F_____;

/** 1111 1101 0000 a101 srca srcb	maclo	%1, %2, %0 */
  ID(maclo); DR(a+32); SR(srca); S2R(srcb); F_____;

/** 1111 1101 0001 0111 a000 rsrc	mvtachi	%1, %0 */
  ID(mvtachi); DR(a+32); SR(rsrc); F_____;

/** 1111 1101 0001 0111 a001 rsrc	mvtaclo	%1, %0 */
  ID(mvtaclo); DR(a+32); SR(rsrc); F_____;

/** 1111 1101 0001 111i a m00 rdst	mvfachi	#%2, %1, %0 */
  ID(mvfachi); S2C(((i^1)<<1)|m); SR(a+32); DR(rdst); F_____;

/** 1111 1101 0001 111i a m10 rdst	mvfacmi	#%2, %1, %0 */
  ID(mvfacmi); S2C(((i^1)<<1)|m); SR(a+32); DR(rdst); F_____;

/** 1111 1101 0001 111i a m01 rdst	mvfaclo	#%2, %1, %0 */
  ID(mvfaclo); S2C(((i^1)<<1)|m); SR(a+32); DR(rdst); F_____;

/** 1111 1101 0001 1000 a00i 0000	racw	#%1, %0 */
  ID(racw); SC(i+1); DR(a+32); F_____;

/*----------------------------------------------------------------------*/
/* SAT									*/

/** 0111 1110 0011 rdst		sat	%0 */
  ID(sat); DR (rdst);

/** 0111 1111 1001 0011		satr */
  ID(satr);

/*----------------------------------------------------------------------*/
/* FLOAT								*/

/** 1111 1101 0111 0010 0010 rdst	fadd	#%1, %0 */
  ID(fadd); DR(rdst); SC(IMM(0)); F__SZ_;

/** 1111 1100 1000 10sd rsrc rdst	fadd	%1%S1, %0 */
  ID(fadd); DR(rdst); SD(sd, rsrc, LSIZE); F__SZ_;

/** 1111 1101 0111 0010 0001 rdst	fcmp	#%1, %0 */
  ID(fcmp); DR(rdst); SC(IMM(0)); F_OSZ_;

/** 1111 1100 1000 01sd rsrc rdst	fcmp	%1%S1, %0 */
  ID(fcmp); DR(rdst); SD(sd, rsrc, LSIZE); F_OSZ_;

/** 1111 1101 0111 0010 0000 rdst	fsub	#%1, %0 */
  ID(fsub); DR(rdst); SC(IMM(0)); F__SZ_;

/** 1111 1100 1000 00sd rsrc rdst	fsub	%1%S1, %0 */
  ID(fsub); DR(rdst); SD(sd, rsrc, LSIZE); F__SZ_;

/** 1111 1100 1001 01sd rsrc rdst	ftoi	%1%S1, %0 */
  ID(ftoi); DR(rdst); SD(sd, rsrc, LSIZE); F__SZ_;

/** 1111 1101 0111 0010 0011 rdst	fmul	#%1, %0 */
  ID(fmul); DR(rdst); SC(IMM(0)); F__SZ_;

/** 1111 1100 1000 11sd rsrc rdst	fmul	%1%S1, %0 */
  ID(fmul); DR(rdst); SD(sd, rsrc, LSIZE); F__SZ_;

/** 1111 1101 0111 0010 0100 rdst	fdiv	#%1, %0 */
  ID(fdiv); DR(rdst); SC(IMM(0)); F__SZ_;

/** 1111 1100 1001 00sd rsrc rdst	fdiv	%1%S1, %0 */
  ID(fdiv); DR(rdst); SD(sd, rsrc, LSIZE); F__SZ_;

/** 1111 1100 1001 10sd rsrc rdst	round	%1%S1, %0 */
  ID(round); DR(rdst); SD(sd, rsrc, LSIZE); F__SZ_;

/** 1111 1100 0100 01sd rsrc rdst	itof	%1%S1, %0 */
  ID(itof); DR (rdst); SP(sd, rsrc); F__SZ_;

/** 0000 0110 mx10 00sd 0001 0001 rsrc rdst	itof	%1%S1, %0 */
  ID(itof); DR (rdst); SPm(sd, rsrc, mx); F__SZ_;

/*----------------------------------------------------------------------*/
/* BIT OPS								*/

/** 1111 00sd rdst 0bit			bset	#%1, %0%S0 */
  ID(bset); BWL(BSIZE); SC(bit); DD(sd, rdst, BSIZE); F_____;

/** 1111 1100 0110 00sd rdst rsrc	bset	%1, %0%S0 */
  ID(bset); BWL(BSIZE); SR(rsrc); DD(sd, rdst, BSIZE); F_____;
  if (sd == 3) /* bset reg,reg */
    BWL(LSIZE);

/** 0111 100b ittt rdst			bset	#%1, %0 */
  ID(bset); BWL(LSIZE); SC(b*16+ittt); DR(rdst); F_____;


/** 1111 00sd rdst 1bit			bclr	#%1, %0%S0 */
  ID(bclr); BWL(BSIZE); SC(bit); DD(sd, rdst, BSIZE); F_____;

/** 1111 1100 0110 01sd rdst rsrc	bclr	%1, %0%S0 */
  ID(bclr); BWL(BSIZE); SR(rsrc); DD(sd, rdst, BSIZE); F_____;
  if (sd == 3) /* bset reg,reg */
    BWL(LSIZE);

/** 0111 101b ittt rdst			bclr	#%1, %0 */
  ID(bclr); BWL(LSIZE); SC(b*16+ittt); DR(rdst); F_____;


/** 1111 01sd rdst 0bit			btst	#%2, %1%S1 */
  ID(btst); BWL(BSIZE); S2C(bit); SD(sd, rdst, BSIZE); F___ZC;

/** 1111 1100 0110 10sd rdst rsrc	btst	%2, %1%S1 */
  ID(btst); BWL(BSIZE); S2R(rsrc); SD(sd, rdst, BSIZE); F___ZC;
  if (sd == 3) /* bset reg,reg */
    BWL(LSIZE);

/** 0111 110b ittt rdst			btst	#%2, %1 */
  ID(btst); BWL(LSIZE); S2C(b*16+ittt); SR(rdst); F___ZC;


/** 1111 1100 111bit sd rdst 1111	bnot	#%1, %0%S0 */
  ID(bnot); BWL(BSIZE); SC(bit); DD(sd, rdst, BSIZE);

/** 1111 1100 0110 11sd rdst rsrc	bnot	%1, %0%S0 */
  ID(bnot); BWL(BSIZE); SR(rsrc); DD(sd, rdst, BSIZE);
  if (sd == 3) /* bset reg,reg */
    BWL(LSIZE);

/** 1111 1101 111bittt 1111 rdst	bnot	#%1, %0 */
  ID(bnot); BWL(LSIZE); SC(bittt); DR(rdst);


/** 1111 1100 111bit sd rdst cond	bm%2	#%1, %0%S0 */
  ID(bmcc); BWL(BSIZE); S2cc(cond); SC(bit); DD(sd, rdst, BSIZE);

/** 1111 1101 111 bittt cond rdst	bm%2	#%1, %0%S0 */
  ID(bmcc); BWL(LSIZE); S2cc(cond); SC(bittt); DR(rdst);

/*----------------------------------------------------------------------*/
/* CONTROL REGISTERS							*/

/** 0111 1111 1011 rdst			clrpsw	%0 */
  ID(clrpsw); DF(rdst);

/** 0111 1111 1010 rdst			setpsw	%0 */
  ID(setpsw); DF(rdst);

/** 0111 0101 0111 0000 0000 immm	mvtipl	#%1 */
  ID(mvtipl); SC(immm);

/** 0111 1110 111 crdst			popc	%0 */
  ID(mov); OP(1, RX_Operand_Postinc, 0, 0); DR(crdst + 16);

/** 0111 1110 110 crsrc			pushc	%1 */
  ID(mov); OP(0, RX_Operand_Predec, 0, 0); SR(crsrc + 16);

/** 1111 1101 0111 im11 000crdst	mvtc	#%1, %0 */
  ID(mov); SC(IMMex(im)); DR(crdst + 16);

/** 1111 1101 0110 100c rsrc rdst	mvtc	%1, %0 */
  ID(mov); SR(rsrc); DR(c*16+rdst + 16);

/** 1111 1101 0110 101s rsrc rdst	mvfc	%1, %0 */
  ID(mov); SR((s*16+rsrc) + 16); DR(rdst);

/*----------------------------------------------------------------------*/
/* INTERRUPTS								*/

/** 0111 1111 1001 0100		rtfi */
  ID(rtfi);

/** 0111 1111 1001 0101		rte */
  ID(rte);

/** 0000 0000			brk */
  ID(brk);

/** 0000 0001			dbt */
  ID(dbt);

/** 0111 0101 0110 0000		int #%1 */
  ID(int); SC(IMM(1));

/** 0111 1111 1001 0110		wait */
  ID(wait);

/*----------------------------------------------------------------------*/
/* SCcnd								*/

/** 1111 1100 1101 sz sd rdst cond	sc%1%s	%0 */
  ID(sccnd); BWL(sz); DD (sd, rdst, sz); Scc(cond);

/*----------------------------------------------------------------------*/
/* RXv2 enhanced								*/

/** 1111 1101 0010 0111 rdst rsrc	movco	%1, [%0] */
   ID(movco); SR(rsrc); DR(rdst); F_____;

/** 1111 1101 0010 1111 rsrc rdst	movli	[%1], %0 */
   ID(movli); SR(rsrc); DR(rdst); F_____;

/** 1111 1100 0100 1011 rsrc rdst	stz	%1, %0 */
  ID(stcc); SR(rsrc); DR(rdst); S2cc(RXC_z);

/** 1111 1100 0100 1111 rsrc rdst	stnz	%1, %0 */
  ID(stcc); SR(rsrc); DR(rdst); S2cc(RXC_nz);

/** 1111 1101 0000 a111 srca srcb 	emaca	%1, %2, %0 */
  ID(emaca); DR(a+32); SR(srca); S2R(srcb); F_____;

/** 1111 1101 0100 a111 srca srcb 	emsba	%1, %2, %0 */
  ID(emsba); DR(a+32); SR(srca); S2R(srcb); F_____;

/** 1111 1101 0000 a011 srca srcb 	emula	%1, %2, %0 */
  ID(emula); DR(a+32); SR(srca); S2R(srcb); F_____;

/** 1111 1101 0000 a110 srca srcb	maclh	%1, %2, %0 */
  ID(maclh); DR(a+32); SR(srca); S2R(srcb); F_____;

/** 1111 1101 0100 a100 srca srcb	msbhi	%1, %2, %0 */
  ID(msbhi); DR(a+32); SR(srca); S2R(srcb); F_____;

/** 1111 1101 0100 a110 srca srcb	msblh	%1, %2, %0 */
  ID(msblh); DR(a+32); SR(srca); S2R(srcb); F_____;

/** 1111 1101 0100 a101 srca srcb	msblo	%1, %2, %0 */
  ID(msblo); DR(a+32); SR(srca); S2R(srcb); F_____;

/** 1111 1101 0000 a010 srca srcb	mullh	%1, %2, %0 */
  ID(mullh); DR(a+32); SR(srca); S2R(srcb); F_____;

/** 1111 1101 0001 111i a m11 rdst	mvfacgu	#%2, %1, %0 */
  ID(mvfacgu); S2C(((i^1)<<1)|m); SR(a+32); DR(rdst); F_____;

/** 1111 1101 0001 0111 a011 rdst	mvtacgu	%0, %1 */
  ID(mvtacgu); DR(a+32); SR(rdst); F_____;

/** 1111 1101 0001 1001 a00i 0000	racl	#%1, %0 */
  ID(racl); SC(i+1); DR(a+32); F_____;

/** 1111 1101 0001 1001 a10i 0000	rdacl	#%1, %0 */
  ID(rdacl); SC(i+1); DR(a+32); F_____;

/** 1111 1101 0001 1000 a10i 0000	rdacw	#%1, %0 */
  ID(rdacw); SC(i+1); DR(a+32); F_____;

/** 1111 1111 1010 rdst srca srcb	fadd	%2, %1, %0 */
  ID(fadd); DR(rdst); SR(srcb); S2R(srca); F__SZ_;

/** 1111 1111 1000 rdst srca srcb	fsub	%2, %1, %0 */
  ID(fsub); DR(rdst); SR(srcb); S2R(srca); F__SZ_;

/** 1111 1111 1011 rdst srca srcb	fmul	%2, %1, %0 */
  ID(fmul); DR(rdst); SR(srcb); S2R(srca); F__SZ_;

/** 1111 1100 1010 00sd rsrc rdst	fsqrt	%1%S1, %0 */
  ID(fsqrt); DR(rdst); SD(sd, rsrc, LSIZE); F__SZ_;

/** 1111 1100 1010 01sd rsrc rdst	ftou	%1%S1, %0 */
  ID(ftou); DR(rdst); SD(sd, rsrc, LSIZE); F__SZ_;

/** 1111 1100 0101 01sd rsrc rdst	utof	%1%S1, %0 */
  ID(utof); DR (rdst); SP(sd, rsrc); F__SZ_;

/** 0000 0110 mx10 00sd 0001 0101 rsrc rdst	utof	%1%S1, %0 */
  ID(utof); DR (rdst); SPm(sd, rsrc, mx); F__SZ_;

/** */

  return rx->n_bytes;
}