[thirdparty/binutils-gdb.git] / opcodes / xgate-dis.c

/* xgate-dis.c -- Freescale XGATE disassembly
   Copyright (C) 2009-2020 Free Software Foundation, Inc.
   Written by Sean Keys (skeys@ipdatasys.com)

   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 <assert.h>
#include "disassemble.h"
#include "opintl.h"
#include "libiberty.h"
#include "ansidecl.h"
#include "opcode/xgate.h"

#define XGATE_TWO_BYTES      0x02
#define XGATE_NINE_BITS      0x1FF
#define XGATE_TEN_BITS       0x3FF
#define XGATE_NINE_SIGNBIT   0x100
#define XGATE_TEN_SIGNBIT    0x200

/* Structures.  */
struct decodeInfo
{
  unsigned int operMask;
  unsigned int operMasksRegisterBits;
  struct xgate_opcode *opcodePTR;
};

/* Prototypes for local functions.  */
static int print_insn (bfd_vma, struct disassemble_info *);
static int read_memory (bfd_vma, bfd_byte*, int, struct disassemble_info *);
static int ripBits (unsigned int *, int,
		    struct xgate_opcode *, unsigned int);
static int macro_search (char *, char *);
static struct decodeInfo * find_match (unsigned int);

/* Statics.  */
static struct decodeInfo *decodeTable;
static int initialized;
static char previousOpName[10];
static unsigned int perviousBin;

/* Disassemble one instruction at address 'memaddr'.  Returns the number
   of bytes used by that instruction.  */

static int
print_insn (bfd_vma memaddr, struct disassemble_info* info)
{
  int status;
  unsigned int raw_code;
  char *s = 0;
  long bytesRead = 0;
  int i = 0;
  struct xgate_opcode *opcodePTR = (struct xgate_opcode*) xgate_opcodes;
  struct decodeInfo *decodeTablePTR = 0;
  struct decodeInfo *decodePTR = 0;
  unsigned int operandRegisterBits = 0;
  signed int relAddr = 0;
  signed int operandOne = 0;
  signed int operandTwo = 0;
  bfd_byte buffer[4];
  bfd_vma absAddress;

  unsigned int operMaskReg = 0;
  /* Initialize our array of opcode masks and check them against our constant
     table.  */
  if (!initialized)
    {
      decodeTable = xmalloc (sizeof (struct decodeInfo) * xgate_num_opcodes);
      for (i = 0, decodeTablePTR = decodeTable; i < xgate_num_opcodes;
          i++, decodeTablePTR++, opcodePTR++)
        {
          unsigned int bin = 0;
          unsigned int mask = 0;
          for (s = opcodePTR->format; *s; s++)
            {
              bin <<= 1;
              mask <<= 1;
              operandRegisterBits <<= 1;
              bin |= (*s == '1');
              mask |= (*s == '0' || *s == '1');
              operandRegisterBits |= (*s == 'r');
            }
          /* Asserting will uncover inconsistencies in our table.  */
          assert ((s - opcodePTR->format) == 16 || (s - opcodePTR->format) == 32);
          assert (opcodePTR->bin_opcode == bin);

          decodeTablePTR->operMask = mask;
          decodeTablePTR->operMasksRegisterBits = operandRegisterBits;
          decodeTablePTR->opcodePTR = opcodePTR;
        }
      initialized = 1;
    }

  /* Read 16 bits.  */
  bytesRead += XGATE_TWO_BYTES;
  status = read_memory (memaddr, buffer, XGATE_TWO_BYTES, info);
  if (status == 0)
    {
      raw_code = buffer[0];
      raw_code <<= 8;
      raw_code += buffer[1];

      decodePTR = find_match (raw_code);
      if (decodePTR)
        {
          operMaskReg = decodePTR->operMasksRegisterBits;
          (*info->fprintf_func)(info->stream, "%s", decodePTR->opcodePTR->name);

          /* First we compare the shorthand format of the constraints. If we
	      still are unable to pinpoint the operands
	      we analyze the opcodes constraint string.  */
          if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_MON_R_C))
        	{
        	  (*info->fprintf_func)(info->stream, " R%x, CCR",
        		  (raw_code >> 8) & 0x7);
        	}
          else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_MON_C_R))
            {
        	  (*info->fprintf_func)(info->stream, " CCR, R%x",
        	      (raw_code >> 8) & 0x7);
            }
          else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_MON_R_P))
            {
        	  (*info->fprintf_func)(info->stream, " R%x, PC",
        	      (raw_code >> 8) & 0x7);
            }
          else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_TRI))
            {
                  (*info->fprintf_func)(info->stream, " R%x, R%x, R%x",
                      (raw_code >> 8) & 0x7, (raw_code >> 5) & 0x7,
                      (raw_code >> 2) & 0x7);
            }
          else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_IDR))
            {
                  if (raw_code & 0x01)
                    {
                      (*info->fprintf_func)(info->stream, " R%x, (R%x, R%x+)",
                          (raw_code >> 8) & 0x7, (raw_code >> 5) & 0x7,
                          (raw_code >> 2) & 0x7);
                    }
                   else if (raw_code & 0x02)
                          {
                            (*info->fprintf_func)(info->stream, " R%x, (R%x, -R%x)",
                                (raw_code >> 8) & 0x7, (raw_code >> 5) & 0x7,
                                (raw_code >> 2) & 0x7);
                          }
                   else
                     {
                       (*info->fprintf_func)(info->stream, " R%x, (R%x, R%x)",
                           (raw_code >> 8) & 0x7, (raw_code >> 5) & 0x7,
                           (raw_code >> 2) & 0x7);
                     }
            }
          else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_DYA))
            {
        	  operandOne = ripBits (&operMaskReg, 3, decodePTR->opcodePTR, raw_code);
        	  operandTwo = ripBits (&operMaskReg, 3, decodePTR->opcodePTR, raw_code);
        	 ( *info->fprintf_func)(info->stream, " R%x, R%x", operandOne,
        	      operandTwo);
            }
          else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_IDO5))
            {
        	  (*info->fprintf_func)(info->stream, " R%x, (R%x, #0x%x)",
        	      (raw_code >> 8) & 0x7, (raw_code >> 5) & 0x7, raw_code & 0x1f);
            }
          else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_MON))
            {
        	  operandOne = ripBits (&operMaskReg, 3, decodePTR->opcodePTR,
        	     raw_code);
        	 (*info->fprintf_func)(info->stream, " R%x", operandOne);
            }
          else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_REL9))
            {
              /* If address is negative handle it accordingly.  */
              if (raw_code & XGATE_NINE_SIGNBIT)
                {
                  relAddr = XGATE_NINE_BITS >> 1; /* Clip sign bit.  */
                  relAddr = ~relAddr; /* Make signed.  */
                  relAddr |= (raw_code & 0xFF) + 1; /* Apply our value.  */
                  relAddr *= 2; /* Multiply by two as per processor docs.  */
                }
              else
                {
                  relAddr = raw_code & 0xff;
                  relAddr = relAddr * 2 + 2;
                }
             (*info->fprintf_func)(info->stream, " *%d", relAddr);
             (*info->fprintf_func)(info->stream, "  Abs* 0x");
             (*info->print_address_func)(memaddr + relAddr, info);
           }
          else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_REL10))
            {
              /* If address is negative handle it accordingly.  */
              if (raw_code & XGATE_TEN_SIGNBIT)
                {
                  relAddr = XGATE_TEN_BITS >> 1; /* Clip sign bit.  */
                  relAddr = ~relAddr; /* Make signed.  */
                  relAddr |= (raw_code & 0x1FF) + 1; /* Apply our value.  */
                  relAddr *= 2; /* Multiply by two as per processor docs.  */
                }
              else
                {
                  relAddr = raw_code & 0x1FF;
                  relAddr = relAddr * 2 + 2;
                }
              (*info->fprintf_func)(info->stream, " *%d", relAddr);
              (*info->fprintf_func)(info->stream, "  Abs* 0x");
              (*info->print_address_func)(memaddr + relAddr, info);
            }
          else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_IMM4))
            {
              (*info->fprintf_func)(info->stream, " R%x, #0x%02x",
              (raw_code >> 8) & 0x7, (raw_code >> 4) & 0xF);
            }
          else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_IMM8))
            {
              if (macro_search (decodePTR->opcodePTR->name, previousOpName) &&
                 previousOpName[0])
               {
                 absAddress = (0xFF & raw_code) << 8;
                 absAddress |= perviousBin & 0xFF;
                 (*info->fprintf_func)(info->stream, " R%x, #0x%02x Abs* 0x",
                     (raw_code >> 8) & 0x7, raw_code & 0xff);
                 (*info->print_address_func)(absAddress, info);
                 previousOpName[0] = 0;
               }
              else
               {
                 strcpy (previousOpName, decodePTR->opcodePTR->name);
                 (*info->fprintf_func)(info->stream, " R%x, #0x%02x",
                     (raw_code >> 8) & 0x7, raw_code & 0xff);
               }
            }
          else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_IMM3))
            {
        	  (*info->fprintf_func)(info->stream, " #0x%x",
        	     (raw_code >> 8) & 0x7);
            }
          else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_INH))
            {
        	  //
            }
          else
            {
              (*info->fprintf_func)(info->stream, " unhandled mode %s",
				    decodePTR->opcodePTR->constraints);
            }
          perviousBin = raw_code;
        }
      else
        {
          (*info->fprintf_func)(info->stream,
				" unable to find opcode match #0%x", raw_code);
        }
    }
  return bytesRead;
}

int
print_insn_xgate (bfd_vma memaddr, struct disassemble_info* info)
{
  return print_insn (memaddr, info);
}

static int
read_memory (bfd_vma memaddr, bfd_byte* buffer, int size,
    struct disassemble_info* info)
{
  int status;
  status = (*info->read_memory_func) (memaddr, buffer, size, info);
  if (status != 0)
    {
      (*info->memory_error_func) (status, memaddr, info);
      return -1;
    }
  return 0;
}

static int
ripBits (unsigned int *operandBitsRemaining,
	 int numBitsRequested,
	 struct xgate_opcode *opcodePTR,
	 unsigned int memory)
{
  unsigned int currentBit;
  unsigned int operand = 0;
  int numBitsFound;

  for (numBitsFound = 0, currentBit = 1u << ((opcodePTR->size * 8) - 1);
       numBitsFound < numBitsRequested && currentBit != 0;
       currentBit >>= 1)
    {
      if (currentBit & *operandBitsRemaining)
	{
	  *operandBitsRemaining &= ~(currentBit); /* Consume the current bit.  */
	  operand <<= 1; /* Make room for our next bit.  */
	  numBitsFound++;
	  operand |= (currentBit & memory) > 0;
	}
    }
  return operand;
}

static int
macro_search (char *currentName, char *lastName)
{
  int i;
  int length = 0;
  char *where;

  for (i = 0; i < xgate_num_opcodes; i++)
    {
      where = strstr (xgate_opcodes[i].constraints, lastName);

      if (where)
        {
          length = strlen (where);
        }
      if (length)
        {
          where = strstr (xgate_opcodes[i].constraints, currentName);
          if (where)
            {
              length = strlen (where);
              return 1;
            }
        }
    }
  return 0;
}

static struct decodeInfo *
find_match (unsigned int raw_code)
{
  struct decodeInfo *decodeTablePTR = 0;
  int i;

  for (i = 0, decodeTablePTR = decodeTable; i < xgate_num_opcodes;
      i++, decodeTablePTR++)
    {
      if ((raw_code & decodeTablePTR->operMask)
          == decodeTablePTR->opcodePTR->bin_opcode)
        {
          /* Make sure we didn't run into a macro or alias.  */
          if (decodeTablePTR->opcodePTR->cycles_min != 0)
            {
              return decodeTablePTR;
              break;
            }
          else
	    continue;
        }
    }
  return 0;
}
Commit	Line	Data
f6c1a2d5	1	/* xgate-dis.c -- Freescale XGATE disassembly
b3adc24a	2	Copyright (C) 2009-2020 Free Software Foundation, Inc.
f6c1a2d5 NC	3	Written by Sean Keys (skeys@ipdatasys.com)
	4
	5	This file is part of the GNU opcodes library.
	6
	7	This library is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 3, or (at your option)
	10	any later version.
	11
	12	It is distributed in the hope that it will be useful, but WITHOUT
	13	ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
	14	or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
	15	License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with this program; if not, write to the Free Software
	19	Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
df7b86aa	20	MA 02110-1301, USA. */
f6c1a2d5	21
f6c1a2d5	22	#include "sysdep.h"
df7b86aa	23	#include <assert.h>
88c1242d	24	#include "disassemble.h"
f6c1a2d5 NC	25	#include "opintl.h"
	26	#include "libiberty.h"
	27	#include "ansidecl.h"
	28	#include "opcode/xgate.h"
	29
	30	#define XGATE_TWO_BYTES 0x02
	31	#define XGATE_NINE_BITS 0x1FF
	32	#define XGATE_TEN_BITS 0x3FF
	33	#define XGATE_NINE_SIGNBIT 0x100
	34	#define XGATE_TEN_SIGNBIT 0x200
	35
df7b86aa NC	36	/* Structures. */
	37	struct decodeInfo
	38	{
f6c1a2d5 NC	39	unsigned int operMask;
	40	unsigned int operMasksRegisterBits;
	41	struct xgate_opcode *opcodePTR;
	42	};
	43
	44	/* Prototypes for local functions. */
df7b86aa NC	45	static int print_insn (bfd_vma, struct disassemble_info *);
	46	static int read_memory (bfd_vma, bfd_byte, int, struct disassemble_info );
	47	static int ripBits (unsigned int *, int,
	48	struct xgate_opcode *, unsigned int);
	49	static int macro_search (char , char );
	50	static struct decodeInfo * find_match (unsigned int);
f6c1a2d5	51
df7b86aa	52	/* Statics. */
f6c1a2d5 NC	53	static struct decodeInfo *decodeTable;
	54	static int initialized;
	55	static char previousOpName[10];
	56	static unsigned int perviousBin;
	57
	58	/* Disassemble one instruction at address 'memaddr'. Returns the number
df7b86aa NC	59	of bytes used by that instruction. */
df7b86aa NC	60
f6c1a2d5 NC	61	static int
	62	print_insn (bfd_vma memaddr, struct disassemble_info* info)
	63	{
	64	int status;
	65	unsigned int raw_code;
	66	char *s = 0;
	67	long bytesRead = 0;
	68	int i = 0;
	69	struct xgate_opcode opcodePTR = (struct xgate_opcode) xgate_opcodes;
	70	struct decodeInfo *decodeTablePTR = 0;
	71	struct decodeInfo *decodePTR = 0;
	72	unsigned int operandRegisterBits = 0;
	73	signed int relAddr = 0;
	74	signed int operandOne = 0;
	75	signed int operandTwo = 0;
	76	bfd_byte buffer[4];
	77	bfd_vma absAddress;
	78
	79	unsigned int operMaskReg = 0;
df7b86aa NC	80	/* Initialize our array of opcode masks and check them against our constant
df7b86aa NC	81	table. */
f6c1a2d5 NC	82	if (!initialized)
f6c1a2d5 NC	83	{
df7b86aa	84	decodeTable = xmalloc (sizeof (struct decodeInfo) * xgate_num_opcodes);
f6c1a2d5 NC	85	for (i = 0, decodeTablePTR = decodeTable; i < xgate_num_opcodes;
	86	i++, decodeTablePTR++, opcodePTR++)
	87	{
	88	unsigned int bin = 0;
	89	unsigned int mask = 0;
	90	for (s = opcodePTR->format; *s; s++)
	91	{
	92	bin <<= 1;
	93	mask <<= 1;
	94	operandRegisterBits <<= 1;
	95	bin \|= (*s == '1');
	96	mask \|= (s == '0' \|\| s == '1');
	97	operandRegisterBits \|= (*s == 'r');
	98	}
df7b86aa NC	99	/* Asserting will uncover inconsistencies in our table. */
	100	assert ((s - opcodePTR->format) == 16 \|\| (s - opcodePTR->format) == 32);
	101	assert (opcodePTR->bin_opcode == bin);
	102
f6c1a2d5 NC	103	decodeTablePTR->operMask = mask;
	104	decodeTablePTR->operMasksRegisterBits = operandRegisterBits;
	105	decodeTablePTR->opcodePTR = opcodePTR;
	106	}
	107	initialized = 1;
	108	}
df7b86aa NC	109
df7b86aa NC	110	/* Read 16 bits. */
f6c1a2d5	111	bytesRead += XGATE_TWO_BYTES;
df7b86aa	112	status = read_memory (memaddr, buffer, XGATE_TWO_BYTES, info);
f6c1a2d5 NC	113	if (status == 0)
	114	{
	115	raw_code = buffer[0];
	116	raw_code <<= 8;
	117	raw_code += buffer[1];
	118
df7b86aa	119	decodePTR = find_match (raw_code);
f6c1a2d5 NC	120	if (decodePTR)
	121	{
	122	operMaskReg = decodePTR->operMasksRegisterBits;
	123	(*info->fprintf_func)(info->stream, "%s", decodePTR->opcodePTR->name);
df7b86aa	124
f6c1a2d5	125	/* First we compare the shorthand format of the constraints. If we
0e1c2434 SK	126	still are unable to pinpoint the operands
	127	we analyze the opcodes constraint string. */
	128	if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_MON_R_C))
	129	{
	130	(*info->fprintf_func)(info->stream, " R%x, CCR",
	131	(raw_code >> 8) & 0x7);
	132	}
	133	else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_MON_C_R))
	134	{
	135	(*info->fprintf_func)(info->stream, " CCR, R%x",
	136	(raw_code >> 8) & 0x7);
	137	}
	138	else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_MON_R_P))
	139	{
	140	(*info->fprintf_func)(info->stream, " R%x, PC",
	141	(raw_code >> 8) & 0x7);
	142	}
	143	else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_TRI))
	144	{
	145	(*info->fprintf_func)(info->stream, " R%x, R%x, R%x",
	146	(raw_code >> 8) & 0x7, (raw_code >> 5) & 0x7,
	147	(raw_code >> 2) & 0x7);
	148	}
	149	else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_IDR))
	150	{
	151	if (raw_code & 0x01)
	152	{
	153	(*info->fprintf_func)(info->stream, " R%x, (R%x, R%x+)",
	154	(raw_code >> 8) & 0x7, (raw_code >> 5) & 0x7,
	155	(raw_code >> 2) & 0x7);
	156	}
	157	else if (raw_code & 0x02)
	158	{
	159	(*info->fprintf_func)(info->stream, " R%x, (R%x, -R%x)",
	160	(raw_code >> 8) & 0x7, (raw_code >> 5) & 0x7,
	161	(raw_code >> 2) & 0x7);
	162	}
	163	else
	164	{
	165	(*info->fprintf_func)(info->stream, " R%x, (R%x, R%x)",
	166	(raw_code >> 8) & 0x7, (raw_code >> 5) & 0x7,
	167	(raw_code >> 2) & 0x7);
	168	}
	169	}
	170	else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_DYA))
	171	{
dee33451 NC	172	operandOne = ripBits (&operMaskReg, 3, decodePTR->opcodePTR, raw_code);
dee33451 NC	173	operandTwo = ripBits (&operMaskReg, 3, decodePTR->opcodePTR, raw_code);
0e1c2434 SK	174	( *info->fprintf_func)(info->stream, " R%x, R%x", operandOne,
	175	operandTwo);
	176	}
	177	else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_IDO5))
	178	{
	179	(*info->fprintf_func)(info->stream, " R%x, (R%x, #0x%x)",
	180	(raw_code >> 8) & 0x7, (raw_code >> 5) & 0x7, raw_code & 0x1f);
	181	}
	182	else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_MON))
	183	{
	184	operandOne = ripBits (&operMaskReg, 3, decodePTR->opcodePTR,
	185	raw_code);
	186	(*info->fprintf_func)(info->stream, " R%x", operandOne);
	187	}
	188	else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_REL9))
f6c1a2d5	189	{
df7b86aa	190	/* If address is negative handle it accordingly. */
f6c1a2d5 NC	191	if (raw_code & XGATE_NINE_SIGNBIT)
f6c1a2d5 NC	192	{
df7b86aa NC	193	relAddr = XGATE_NINE_BITS >> 1; /* Clip sign bit. */
	194	relAddr = ~relAddr; /* Make signed. */
	195	relAddr \|= (raw_code & 0xFF) + 1; /* Apply our value. */
7ef412cf	196	relAddr = 2; / Multiply by two as per processor docs. */
f6c1a2d5 NC	197	}
	198	else
	199	{
	200	relAddr = raw_code & 0xff;
7ef412cf	201	relAddr = relAddr * 2 + 2;
f6c1a2d5	202	}
0e1c2434 SK	203	(info->fprintf_func)(info->stream, " %d", relAddr);
	204	(info->fprintf_func)(info->stream, " Abs 0x");
	205	(*info->print_address_func)(memaddr + relAddr, info);
	206	}
df7b86aa	207	else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_REL10))
f6c1a2d5	208	{
df7b86aa	209	/* If address is negative handle it accordingly. */
f6c1a2d5 NC	210	if (raw_code & XGATE_TEN_SIGNBIT)
f6c1a2d5 NC	211	{
df7b86aa NC	212	relAddr = XGATE_TEN_BITS >> 1; /* Clip sign bit. */
	213	relAddr = ~relAddr; /* Make signed. */
	214	relAddr \|= (raw_code & 0x1FF) + 1; /* Apply our value. */
7ef412cf	215	relAddr = 2; / Multiply by two as per processor docs. */
f6c1a2d5 NC	216	}
	217	else
	218	{
	219	relAddr = raw_code & 0x1FF;
7ef412cf	220	relAddr = relAddr * 2 + 2;
f6c1a2d5 NC	221	}
	222	(info->fprintf_func)(info->stream, " %d", relAddr);
	223	(info->fprintf_func)(info->stream, " Abs 0x");
	224	(*info->print_address_func)(memaddr + relAddr, info);
	225	}
0e1c2434 SK	226	else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_IMM4))
	227	{
	228	(*info->fprintf_func)(info->stream, " R%x, #0x%02x",
	229	(raw_code >> 8) & 0x7, (raw_code >> 4) & 0xF);
	230	}
	231	else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_IMM8))
	232	{
	233	if (macro_search (decodePTR->opcodePTR->name, previousOpName) &&
	234	previousOpName[0])
	235	{
	236	absAddress = (0xFF & raw_code) << 8;
	237	absAddress \|= perviousBin & 0xFF;
	238	(info->fprintf_func)(info->stream, " R%x, #0x%02x Abs 0x",
	239	(raw_code >> 8) & 0x7, raw_code & 0xff);
	240	(*info->print_address_func)(absAddress, info);
	241	previousOpName[0] = 0;
	242	}
	243	else
	244	{
	245	strcpy (previousOpName, decodePTR->opcodePTR->name);
	246	(*info->fprintf_func)(info->stream, " R%x, #0x%02x",
	247	(raw_code >> 8) & 0x7, raw_code & 0xff);
	248	}
	249	}
	250	else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_IMM3))
	251	{
	252	(*info->fprintf_func)(info->stream, " #0x%x",
	253	(raw_code >> 8) & 0x7);
	254	}
	255	else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_INH))
	256	{
	257	//
	258	}
f6c1a2d5 NC	259	else
f6c1a2d5 NC	260	{
0e1c2434	261	(*info->fprintf_func)(info->stream, " unhandled mode %s",
dee33451	262	decodePTR->opcodePTR->constraints);
f6c1a2d5	263	}
f6c1a2d5 NC	264	perviousBin = raw_code;
	265	}
	266	else
	267	{
	268	(*info->fprintf_func)(info->stream,
df7b86aa	269	" unable to find opcode match #0%x", raw_code);
f6c1a2d5 NC	270	}
	271	}
	272	return bytesRead;
	273	}
	274
	275	int
	276	print_insn_xgate (bfd_vma memaddr, struct disassemble_info* info)
	277	{
	278	return print_insn (memaddr, info);
	279	}
	280
	281	static int
	282	read_memory (bfd_vma memaddr, bfd_byte* buffer, int size,
	283	struct disassemble_info* info)
	284	{
	285	int status;
	286	status = (*info->read_memory_func) (memaddr, buffer, size, info);
	287	if (status != 0)
	288	{
	289	(*info->memory_error_func) (status, memaddr, info);
	290	return -1;
	291	}
	292	return 0;
	293	}
	294
	295	static int
df7b86aa NC	296	ripBits (unsigned int *operandBitsRemaining,
	297	int numBitsRequested,
	298	struct xgate_opcode *opcodePTR,
	299	unsigned int memory)
f6c1a2d5 NC	300	{
f6c1a2d5 NC	301	unsigned int currentBit;
7ef412cf	302	unsigned int operand = 0;
f6c1a2d5	303	int numBitsFound;
df7b86aa	304
7ef412cf AM	305	for (numBitsFound = 0, currentBit = 1u << ((opcodePTR->size * 8) - 1);
	306	numBitsFound < numBitsRequested && currentBit != 0;
	307	currentBit >>= 1)
f6c1a2d5	308	{
df7b86aa NC	309	if (currentBit & *operandBitsRemaining)
	310	{
	311	operandBitsRemaining &= ~(currentBit); / Consume the current bit. */
	312	operand <<= 1; /* Make room for our next bit. */
	313	numBitsFound++;
	314	operand \|= (currentBit & memory) > 0;
	315	}
	316	}
f6c1a2d5 NC	317	return operand;
	318	}
	319
df7b86aa NC	320	static int
df7b86aa NC	321	macro_search (char currentName, char lastName)
f6c1a2d5 NC	322	{
	323	int i;
	324	int length = 0;
	325	char *where;
df7b86aa	326
f6c1a2d5 NC	327	for (i = 0; i < xgate_num_opcodes; i++)
f6c1a2d5 NC	328	{
df7b86aa NC	329	where = strstr (xgate_opcodes[i].constraints, lastName);
df7b86aa NC	330
f6c1a2d5 NC	331	if (where)
f6c1a2d5 NC	332	{
df7b86aa	333	length = strlen (where);
f6c1a2d5 NC	334	}
	335	if (length)
	336	{
df7b86aa	337	where = strstr (xgate_opcodes[i].constraints, currentName);
f6c1a2d5 NC	338	if (where)
f6c1a2d5 NC	339	{
df7b86aa	340	length = strlen (where);
f6c1a2d5 NC	341	return 1;
	342	}
	343	}
	344	}
	345	return 0;
	346	}
	347
df7b86aa NC	348	static struct decodeInfo *
df7b86aa NC	349	find_match (unsigned int raw_code)
f6c1a2d5 NC	350	{
	351	struct decodeInfo *decodeTablePTR = 0;
	352	int i;
	353
	354	for (i = 0, decodeTablePTR = decodeTable; i < xgate_num_opcodes;
	355	i++, decodeTablePTR++)
	356	{
	357	if ((raw_code & decodeTablePTR->operMask)
	358	== decodeTablePTR->opcodePTR->bin_opcode)
	359	{
df7b86aa	360	/* Make sure we didn't run into a macro or alias. */
f6c1a2d5 NC	361	if (decodeTablePTR->opcodePTR->cycles_min != 0)
	362	{
	363	return decodeTablePTR;
	364	break;
	365	}
	366	else
df7b86aa	367	continue;
f6c1a2d5 NC	368	}
	369	}
	370	return 0;
	371	}