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[/] [openrisc/] [trunk/] [gnu-stable/] [gdb-7.2/] [opcodes/] [d30v-dis.c] - Blame information for rev 835

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1 330 jeremybenn 
/* Disassemble D30V instructions.
2 
   Copyright 1997, 1998, 2000, 2001, 2005, 2007
3 
   Free Software Foundation, Inc.
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,
20 
   MA 02110-1301, USA.  */
21 
 
22 
#include <stdio.h>
23 
#include "sysdep.h"
24 
#include "opcode/d30v.h"
25 
#include "dis-asm.h"
26 
#include "opintl.h"
27 
 
28 
#define PC_MASK 0xFFFFFFFF
29 
 
30 
/* Return 0 if lookup fails,
31 
   1 if found and only one form,
32 
   2 if found and there are short and long forms.  */
33 
 
34 
static int
35 
lookup_opcode (struct d30v_insn *insn, long num, int is_long)
36 
{
37 
  int i = 0, op_index;
38 
  struct d30v_format *f;
39 
  struct d30v_opcode *op = (struct d30v_opcode *) d30v_opcode_table;
40 
  int op1 = (num >> 25) & 0x7;
41 
  int op2 = (num >> 20) & 0x1f;
42 
  int mod = (num >> 18) & 0x3;
43 
 
44 
  /* Find the opcode.  */
45 
  do
46 
    {
47 
      if ((op->op1 == op1) && (op->op2 == op2))
48 
        break;
49 
      op++;
50 
    }
51 
  while (op->name);
52 
 
53 
  if (!op || !op->name)
54 
    return 0;
55 
 
56 
  while (op->op1 == op1 && op->op2 == op2)
57 
    {
58 
      /* Scan through all the formats for the opcode.  */
59 
      op_index = op->format[i++];
60 
      do
61 
        {
62 
          f = (struct d30v_format *) &d30v_format_table[op_index];
63 
          while (f->form == op_index)
64 
            {
65 
              if ((!is_long || f->form >= LONG) && (f->modifier == mod))
66 
                {
67 
                  insn->form = f;
68 
                  break;
69 
                }
70 
              f++;
71 
            }
72 
          if (insn->form)
73 
            break;
74 
        }
75 
      while ((op_index = op->format[i++]) != 0);
76 
      if (insn->form)
77 
        break;
78 
      op++;
79 
      i = 0;
80 
    }
81 
  if (insn->form == NULL)
82 
    return 0;
83 
 
84 
  insn->op = op;
85 
  insn->ecc = (num >> 28) & 0x7;
86 
  if (op->format[1])
87 
    return 2;
88 
  else
89 
    return 1;
90 
}
91 
 
92 
static int
93 
extract_value (long long num, struct d30v_operand *oper, int is_long)
94 
{
95 
  int val;
96 
  int shift = 12 - oper->position;
97 
  int mask = (0xFFFFFFFF >> (32 - oper->bits));
98 
 
99 
  if (is_long)
100 
    {
101 
      if (oper->bits == 32)
102 
        /* Piece together 32-bit constant.  */
103 
        val = ((num & 0x3FFFF)
104 
               | ((num & 0xFF00000) >> 2)
105 
               | ((num & 0x3F00000000LL) >> 6));
106 
      else
107 
        val = (num >> (32 + shift)) & mask;
108 
    }
109 
  else
110 
    val = (num >> shift) & mask;
111 
 
112 
  if (oper->flags & OPERAND_SHIFT)
113 
    val <<= 3;
114 
 
115 
  return val;
116 
}
117 
 
118 
static void
119 
print_insn (struct disassemble_info *info,
120 
            bfd_vma memaddr,
121 
            long long num,
122 
            struct d30v_insn *insn,
123 
            int is_long,
124 
            int show_ext)
125 
{
126 
  int val, opnum, need_comma = 0;
127 
  struct d30v_operand *oper;
128 
  int i, match, opind = 0, need_paren = 0, found_control = 0;
129 
 
130 
  (*info->fprintf_func) (info->stream, "%s", insn->op->name);
131 
 
132 
  /* Check for CMP or CMPU.  */
133 
  if (d30v_operand_table[insn->form->operands[0]].flags & OPERAND_NAME)
134 
    {
135 
      opind++;
136 
      val =
137 
        extract_value (num,
138 
                       (struct d30v_operand *) &d30v_operand_table[insn->form->operands[0]],
139 
                       is_long);
140 
      (*info->fprintf_func) (info->stream, "%s", d30v_cc_names[val]);
141 
    }
142 
 
143 
  /* Add in ".s" or ".l".  */
144 
  if (show_ext == 2)
145 
    {
146 
      if (is_long)
147 
        (*info->fprintf_func) (info->stream, ".l");
148 
      else
149 
        (*info->fprintf_func) (info->stream, ".s");
150 
    }
151 
 
152 
  if (insn->ecc)
153 
    (*info->fprintf_func) (info->stream, "/%s", d30v_ecc_names[insn->ecc]);
154 
 
155 
  (*info->fprintf_func) (info->stream, "\t");
156 
 
157 
  while ((opnum = insn->form->operands[opind++]) != 0)
158 
    {
159 
      int bits;
160 
 
161 
      oper = (struct d30v_operand *) &d30v_operand_table[opnum];
162 
      bits = oper->bits;
163 
      if (oper->flags & OPERAND_SHIFT)
164 
        bits += 3;
165 
 
166 
      if (need_comma
167 
          && oper->flags != OPERAND_PLUS
168 
          && oper->flags != OPERAND_MINUS)
169 
        {
170 
          need_comma = 0;
171 
          (*info->fprintf_func) (info->stream, ", ");
172 
        }
173 
 
174 
      if (oper->flags == OPERAND_ATMINUS)
175 
        {
176 
          (*info->fprintf_func) (info->stream, "@-");
177 
          continue;
178 
        }
179 
      if (oper->flags == OPERAND_MINUS)
180 
        {
181 
          (*info->fprintf_func) (info->stream, "-");
182 
          continue;
183 
        }
184 
      if (oper->flags == OPERAND_PLUS)
185 
        {
186 
          (*info->fprintf_func) (info->stream, "+");
187 
          continue;
188 
        }
189 
      if (oper->flags == OPERAND_ATSIGN)
190 
        {
191 
          (*info->fprintf_func) (info->stream, "@");
192 
          continue;
193 
        }
194 
      if (oper->flags == OPERAND_ATPAR)
195 
        {
196 
          (*info->fprintf_func) (info->stream, "@(");
197 
          need_paren = 1;
198 
          continue;
199 
        }
200 
 
201 
      if (oper->flags == OPERAND_SPECIAL)
202 
        continue;
203 
 
204 
      val = extract_value (num, oper, is_long);
205 
 
206 
      if (oper->flags & OPERAND_REG)
207 
        {
208 
          match = 0;
209 
          if (oper->flags & OPERAND_CONTROL)
210 
            {
211 
              struct d30v_operand *oper3 =
212 
                (struct d30v_operand *) &d30v_operand_table[insn->form->operands[2]];
213 
              int id = extract_value (num, oper3, is_long);
214 
 
215 
              found_control = 1;
216 
              switch (id)
217 
                {
218 
                case 0:
219 
                  val |= OPERAND_CONTROL;
220 
                  break;
221 
                case 1:
222 
                case 2:
223 
                  val = OPERAND_CONTROL + MAX_CONTROL_REG + id;
224 
                  break;
225 
                case 3:
226 
                  val |= OPERAND_FLAG;
227 
                  break;
228 
                default:
229 
                  fprintf (stderr, "illegal id (%d)\n", id);
230 
                }
231 
            }
232 
          else if (oper->flags & OPERAND_ACC)
233 
            val |= OPERAND_ACC;
234 
          else if (oper->flags & OPERAND_FLAG)
235 
            val |= OPERAND_FLAG;
236 
          for (i = 0; i < reg_name_cnt (); i++)
237 
            {
238 
              if (val == pre_defined_registers[i].value)
239 
                {
240 
                  if (pre_defined_registers[i].pname)
241 
                    (*info->fprintf_func)
242 
                      (info->stream, "%s", pre_defined_registers[i].pname);
243 
                  else
244 
                    (*info->fprintf_func)
245 
                      (info->stream, "%s", pre_defined_registers[i].name);
246 
                  match = 1;
247 
                  break;
248 
                }
249 
            }
250 
          if (match == 0)
251 
            {
252 
              /* This would only get executed if a register was not in
253 
                 the register table.  */
254 
              (*info->fprintf_func)
255 
                (info->stream, _("<unknown register %d>"), val & 0x3F);
256 
            }
257 
        }
258 
      /* repeati has a relocation, but its first argument is a plain
259 
         immediate.  OTOH instructions like djsri have a pc-relative
260 
         delay target, but an absolute jump target.  Therefore, a test
261 
         of insn->op->reloc_flag is not specific enough; we must test
262 
         if the actual operand we are handling now is pc-relative.  */
263 
      else if (oper->flags & OPERAND_PCREL)
264 
        {
265 
          int neg = 0;
266 
 
267 
          /* IMM6S3 is unsigned.  */
268 
          if (oper->flags & OPERAND_SIGNED || bits == 32)
269 
            {
270 
              long max;
271 
              max = (1 << (bits - 1));
272 
              if (val & max)
273 
                {
274 
                  if (bits == 32)
275 
                    val = -val;
276 
                  else
277 
                    val = -val & ((1 << bits) - 1);
278 
                  neg = 1;
279 
                }
280 
            }
281 
          if (neg)
282 
            {
283 
              (*info->fprintf_func) (info->stream, "-%x\t(", val);
284 
              (*info->print_address_func) ((memaddr - val) & PC_MASK, info);
285 
              (*info->fprintf_func) (info->stream, ")");
286 
            }
287 
          else
288 
            {
289 
              (*info->fprintf_func) (info->stream, "%x\t(", val);
290 
              (*info->print_address_func) ((memaddr + val) & PC_MASK, info);
291 
              (*info->fprintf_func) (info->stream, ")");
292 
            }
293 
        }
294 
      else if (insn->op->reloc_flag == RELOC_ABS)
295 
        {
296 
          (*info->print_address_func) (val, info);
297 
        }
298 
      else
299 
        {
300 
          if (oper->flags & OPERAND_SIGNED)
301 
            {
302 
              int max = (1 << (bits - 1));
303 
 
304 
              if (val & max)
305 
                {
306 
                  val = -val;
307 
                  if (bits < 32)
308 
                    val &= ((1 << bits) - 1);
309 
                  (*info->fprintf_func) (info->stream, "-");
310 
                }
311 
            }
312 
          (*info->fprintf_func) (info->stream, "0x%x", val);
313 
        }
314 
      /* If there is another operand, then write a comma and space.  */
315 
      if (insn->form->operands[opind] && !(found_control && opind == 2))
316 
        need_comma = 1;
317 
    }
318 
  if (need_paren)
319 
    (*info->fprintf_func) (info->stream, ")");
320 
}
321 
 
322 
int
323 
print_insn_d30v (bfd_vma memaddr, struct disassemble_info *info)
324 
{
325 
  int status, result;
326 
  bfd_byte buffer[12];
327 
  unsigned long in1, in2;
328 
  struct d30v_insn insn;
329 
  long long num;
330 
 
331 
  insn.form = NULL;
332 
 
333 
  info->bytes_per_line = 8;
334 
  info->bytes_per_chunk = 4;
335 
  info->display_endian = BFD_ENDIAN_BIG;
336 
 
337 
  status = (*info->read_memory_func) (memaddr, buffer, 4, info);
338 
  if (status != 0)
339 
    {
340 
      (*info->memory_error_func) (status, memaddr, info);
341 
      return -1;
342 
    }
343 
  in1 = bfd_getb32 (buffer);
344 
 
345 
  status = (*info->read_memory_func) (memaddr + 4, buffer, 4, info);
346 
  if (status != 0)
347 
    {
348 
      info->bytes_per_line = 8;
349 
      if (!(result = lookup_opcode (&insn, in1, 0)))
350 
        (*info->fprintf_func) (info->stream, ".long\t0x%lx", in1);
351 
      else
352 
        print_insn (info, memaddr, (long long) in1, &insn, 0, result);
353 
      return 4;
354 
    }
355 
  in2 = bfd_getb32 (buffer);
356 
 
357 
  if (in1 & in2 & FM01)
358 
    {
359 
      /* LONG instruction.  */
360 
      if (!(result = lookup_opcode (&insn, in1, 1)))
361 
        {
362 
          (*info->fprintf_func) (info->stream, ".long\t0x%lx,0x%lx", in1, in2);
363 
          return 8;
364 
        }
365 
      num = (long long) in1 << 32 | in2;
366 
      print_insn (info, memaddr, num, &insn, 1, result);
367 
    }
368 
  else
369 
    {
370 
      num = in1;
371 
      if (!(result = lookup_opcode (&insn, in1, 0)))
372 
        (*info->fprintf_func) (info->stream, ".long\t0x%lx", in1);
373 
      else
374 
        print_insn (info, memaddr, num, &insn, 0, result);
375 
 
376 
      switch (((in1 >> 31) << 1) | (in2 >> 31))
377 
        {
378 
        case 0:
379 
          (*info->fprintf_func) (info->stream, "\t||\t");
380 
          break;
381 
        case 1:
382 
          (*info->fprintf_func) (info->stream, "\t->\t");
383 
          break;
384 
        case 2:
385 
          (*info->fprintf_func) (info->stream, "\t<-\t");
386 
        default:
387 
          break;
388 
        }
389 
 
390 
      insn.form = NULL;
391 
      num = in2;
392 
      if (!(result = lookup_opcode (&insn, in2, 0)))
393 
        (*info->fprintf_func) (info->stream, ".long\t0x%lx", in2);
394 
      else
395 
        print_insn (info, memaddr, num, &insn, 0, result);
396 
    }
397 
  return 8;
398 
}

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