aboutsummaryrefslogtreecommitdiff
path: root/opcodes/d30v-dis.c
blob: 5f5d07fcd8e0be081992cfdf3a8a8721f2f2cded (plain)
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
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
/* Disassemble D30V instructions.
   Copyright 1997, 1998, 2000, 2001, 2005, 2007
   Free Software Foundation, Inc.

   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 <stdio.h>
#include "sysdep.h"
#include "opcode/d30v.h"
#include "dis-asm.h"
#include "opintl.h"

#define PC_MASK 0xFFFFFFFF

/* Return 0 if lookup fails,
   1 if found and only one form,
   2 if found and there are short and long forms.  */

static int
lookup_opcode (struct d30v_insn *insn, long num, int is_long)
{
  int i = 0, op_index;
  struct d30v_format *f;
  struct d30v_opcode *op = (struct d30v_opcode *) d30v_opcode_table;
  int op1 = (num >> 25) & 0x7;
  int op2 = (num >> 20) & 0x1f;
  int mod = (num >> 18) & 0x3;

  /* Find the opcode.  */
  do
    {
      if ((op->op1 == op1) && (op->op2 == op2))
	break;
      op++;
    }
  while (op->name);

  if (!op || !op->name)
    return 0;

  while (op->op1 == op1 && op->op2 == op2)
    {
      /* Scan through all the formats for the opcode.  */
      op_index = op->format[i++];
      do
	{
	  f = (struct d30v_format *) &d30v_format_table[op_index];
	  while (f->form == op_index)
	    {
	      if ((!is_long || f->form >= LONG) && (f->modifier == mod))
		{
		  insn->form = f;
		  break;
		}
	      f++;
	    }
	  if (insn->form)
	    break;
	}
      while ((op_index = op->format[i++]) != 0);
      if (insn->form)
	break;
      op++;
      i = 0;
    }
  if (insn->form == NULL)
    return 0;

  insn->op = op;
  insn->ecc = (num >> 28) & 0x7;
  if (op->format[1])
    return 2;
  else
    return 1;
}

static int
extract_value (long long num, struct d30v_operand *oper, int is_long)
{
  int val;
  int shift = 12 - oper->position;
  int mask = (0xFFFFFFFF >> (32 - oper->bits));

  if (is_long)
    {
      if (oper->bits == 32)
	/* Piece together 32-bit constant.  */
	val = ((num & 0x3FFFF)
	       | ((num & 0xFF00000) >> 2)
	       | ((num & 0x3F00000000LL) >> 6));
      else
	val = (num >> (32 + shift)) & mask;
    }
  else
    val = (num >> shift) & mask;

  if (oper->flags & OPERAND_SHIFT)
    val <<= 3;

  return val;
}

static void
print_insn (struct disassemble_info *info,
	    bfd_vma memaddr,
	    long long num,
	    struct d30v_insn *insn,
	    int is_long,
	    int show_ext)
{
  int val, opnum, need_comma = 0;
  struct d30v_operand *oper;
  int i, match, opind = 0, need_paren = 0, found_control = 0;

  (*info->fprintf_func) (info->stream, "%s", insn->op->name);

  /* Check for CMP or CMPU.  */
  if (d30v_operand_table[insn->form->operands[0]].flags & OPERAND_NAME)
    {
      opind++;
      val =
	extract_value (num,
		       (struct d30v_operand *) &d30v_operand_table[insn->form->operands[0]],
		       is_long);
      (*info->fprintf_func) (info->stream, "%s", d30v_cc_names[val]);
    }

  /* Add in ".s" or ".l".  */
  if (show_ext == 2)
    {
      if (is_long)
	(*info->fprintf_func) (info->stream, ".l");
      else
	(*info->fprintf_func) (info->stream, ".s");
    }

  if (insn->ecc)
    (*info->fprintf_func) (info->stream, "/%s", d30v_ecc_names[insn->ecc]);

  (*info->fprintf_func) (info->stream, "\t");

  while ((opnum = insn->form->operands[opind++]) != 0)
    {
      int bits;

      oper = (struct d30v_operand *) &d30v_operand_table[opnum];
      bits = oper->bits;
      if (oper->flags & OPERAND_SHIFT)
	bits += 3;

      if (need_comma
	  && oper->flags != OPERAND_PLUS
	  && oper->flags != OPERAND_MINUS)
	{
	  need_comma = 0;
	  (*info->fprintf_func) (info->stream, ", ");
	}

      if (oper->flags == OPERAND_ATMINUS)
	{
	  (*info->fprintf_func) (info->stream, "@-");
	  continue;
	}
      if (oper->flags == OPERAND_MINUS)
	{
	  (*info->fprintf_func) (info->stream, "-");
	  continue;
	}
      if (oper->flags == OPERAND_PLUS)
	{
	  (*info->fprintf_func) (info->stream, "+");
	  continue;
	}
      if (oper->flags == OPERAND_ATSIGN)
	{
	  (*info->fprintf_func) (info->stream, "@");
	  continue;
	}
      if (oper->flags == OPERAND_ATPAR)
	{
	  (*info->fprintf_func) (info->stream, "@(");
	  need_paren = 1;
	  continue;
	}

      if (oper->flags == OPERAND_SPECIAL)
	continue;

      val = extract_value (num, oper, is_long);

      if (oper->flags & OPERAND_REG)
	{
	  match = 0;
	  if (oper->flags & OPERAND_CONTROL)
	    {
	      struct d30v_operand *oper3 =
		(struct d30v_operand *) &d30v_operand_table[insn->form->operands[2]];
	      int id = extract_value (num, oper3, is_long);

	      found_control = 1;
	      switch (id)
		{
		case 0:
		  val |= OPERAND_CONTROL;
		  break;
		case 1:
		case 2:
		  val = OPERAND_CONTROL + MAX_CONTROL_REG + id;
		  break;
		case 3:
		  val |= OPERAND_FLAG;
		  break;
		default:
		  fprintf (stderr, "illegal id (%d)\n", id);
		}
	    }
	  else if (oper->flags & OPERAND_ACC)
	    val |= OPERAND_ACC;
	  else if (oper->flags & OPERAND_FLAG)
	    val |= OPERAND_FLAG;
	  for (i = 0; i < reg_name_cnt (); i++)
	    {
	      if (val == pre_defined_registers[i].value)
		{
		  if (pre_defined_registers[i].pname)
		    (*info->fprintf_func)
		      (info->stream, "%s", pre_defined_registers[i].pname);
		  else
		    (*info->fprintf_func)
		      (info->stream, "%s", pre_defined_registers[i].name);
		  match = 1;
		  break;
		}
	    }
	  if (match == 0)
	    {
	      /* This would only get executed if a register was not in
		 the register table.  */
	      (*info->fprintf_func)
		(info->stream, _("<unknown register %d>"), val & 0x3F);
	    }
	}
      /* repeati has a relocation, but its first argument is a plain
	 immediate.  OTOH instructions like djsri have a pc-relative
	 delay target, but an absolute jump target.  Therefore, a test
	 of insn->op->reloc_flag is not specific enough; we must test
	 if the actual operand we are handling now is pc-relative.  */
      else if (oper->flags & OPERAND_PCREL)
	{
	  int neg = 0;

	  /* IMM6S3 is unsigned.  */
	  if (oper->flags & OPERAND_SIGNED || bits == 32)
	    {
	      long max;
	      max = (1 << (bits - 1));
	      if (val & max)
		{
		  if (bits == 32)
		    val = -val;
		  else
		    val = -val & ((1 << bits) - 1);
		  neg = 1;
		}
	    }
	  if (neg)
	    {
	      (*info->fprintf_func) (info->stream, "-%x\t(", val);
	      (*info->print_address_func) ((memaddr - val) & PC_MASK, info);
	      (*info->fprintf_func) (info->stream, ")");
	    }
	  else
	    {
	      (*info->fprintf_func) (info->stream, "%x\t(", val);
	      (*info->print_address_func) ((memaddr + val) & PC_MASK, info);
	      (*info->fprintf_func) (info->stream, ")");
	    }
	}
      else if (insn->op->reloc_flag == RELOC_ABS)
	{
	  (*info->print_address_func) (val, info);
	}
      else
	{
	  if (oper->flags & OPERAND_SIGNED)
	    {
	      int max = (1 << (bits - 1));

	      if (val & max)
		{
		  val = -val;
		  if (bits < 32)
		    val &= ((1 << bits) - 1);
		  (*info->fprintf_func) (info->stream, "-");
		}
	    }
	  (*info->fprintf_func) (info->stream, "0x%x", val);
	}
      /* If there is another operand, then write a comma and space.  */
      if (insn->form->operands[opind] && !(found_control && opind == 2))
	need_comma = 1;
    }
  if (need_paren)
    (*info->fprintf_func) (info->stream, ")");
}

int
print_insn_d30v (bfd_vma memaddr, struct disassemble_info *info)
{
  int status, result;
  bfd_byte buffer[12];
  unsigned long in1, in2;
  struct d30v_insn insn;
  long long num;

  insn.form = NULL;

  info->bytes_per_line = 8;
  info->bytes_per_chunk = 4;
  info->display_endian = BFD_ENDIAN_BIG;

  status = (*info->read_memory_func) (memaddr, buffer, 4, info);
  if (status != 0)
    {
      (*info->memory_error_func) (status, memaddr, info);
      return -1;
    }
  in1 = bfd_getb32 (buffer);

  status = (*info->read_memory_func) (memaddr + 4, buffer, 4, info);
  if (status != 0)
    {
      info->bytes_per_line = 8;
      if (!(result = lookup_opcode (&insn, in1, 0)))
	(*info->fprintf_func) (info->stream, ".long\t0x%lx", in1);
      else
	print_insn (info, memaddr, (long long) in1, &insn, 0, result);
      return 4;
    }
  in2 = bfd_getb32 (buffer);

  if (in1 & in2 & FM01)
    {
      /* LONG instruction.  */
      if (!(result = lookup_opcode (&insn, in1, 1)))
	{
	  (*info->fprintf_func) (info->stream, ".long\t0x%lx,0x%lx", in1, in2);
	  return 8;
	}
      num = (long long) in1 << 32 | in2;
      print_insn (info, memaddr, num, &insn, 1, result);
    }
  else
    {
      num = in1;
      if (!(result = lookup_opcode (&insn, in1, 0)))
	(*info->fprintf_func) (info->stream, ".long\t0x%lx", in1);
      else
	print_insn (info, memaddr, num, &insn, 0, result);

      switch (((in1 >> 31) << 1) | (in2 >> 31))
	{
	case 0:
	  (*info->fprintf_func) (info->stream, "\t||\t");
	  break;
	case 1:
	  (*info->fprintf_func) (info->stream, "\t->\t");
	  break;
	case 2:
	  (*info->fprintf_func) (info->stream, "\t<-\t");
	default:
	  break;
	}

      insn.form = NULL;
      num = in2;
      if (!(result = lookup_opcode (&insn, in2, 0)))
	(*info->fprintf_func) (info->stream, ".long\t0x%lx", in2);
      else
	print_insn (info, memaddr, num, &insn, 0, result);
    }
  return 8;
}