File: xgate-dis.c

package info (click to toggle)
binutils 2.31.1-16
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 309,412 kB
  • sloc: ansic: 1,161,194; asm: 638,508; cpp: 128,829; exp: 68,580; makefile: 55,828; sh: 22,360; yacc: 14,238; lisp: 13,272; perl: 2,111; ada: 1,681; lex: 1,652; pascal: 1,446; cs: 879; sed: 195; python: 154; xml: 95; awk: 25
file content (371 lines) | stat: -rw-r--r-- 12,714 bytes parent folder | download | duplicates (8)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
/* xgate-dis.c -- Freescale XGATE disassembly
   Copyright (C) 2009-2018 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, opcodePTR, raw_code);
        	  operandTwo = ripBits (&operMaskReg, 3, 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 <<= 1; /* Multiply by two as per processor docs.  */
                }
              else
                {
                  relAddr = raw_code & 0xff;
                  relAddr = (relAddr << 1) + 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 <<= 1; /* Multiply by two as per processor docs.  */
                }
              else
                {
                  relAddr = raw_code & 0x1FF;
                  relAddr = (relAddr << 1) + 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",
                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;
  int operand;
  int numBitsFound;

  for (operand = 0, numBitsFound = 0, currentBit = 1
	 << ((opcodePTR->size * 8) - 1);
       (numBitsFound < numBitsRequested) && currentBit; 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;
}