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[/] [or1k/] [trunk/] [gdb-5.0/] [opcodes/] [d30v-dis.c] - Blame information for rev 1775

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1 106 markom 
/* Disassemble D30V instructions.
2 
   Copyright (C) 1997, 1998, 2000 Free Software Foundation, Inc.
3 
 
4 
This program is free software; you can redistribute it and/or modify
5 
it under the terms of the GNU General Public License as published by
6 
the Free Software Foundation; either version 2 of the License, or
7 
(at your option) any later version.
8 
 
9 
This program is distributed in the hope that it will be useful,
10 
but WITHOUT ANY WARRANTY; without even the implied warranty of
11 
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 
GNU General Public License for more details.
13 
 
14 
You should have received a copy of the GNU General Public License
15 
along with this program; if not, write to the Free Software
16 
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
17 
 
18 
#include <stdio.h>
19 
#include "opcode/d30v.h"
20 
#include "dis-asm.h"
21 
#include "opintl.h"
22 
 
23 
#define PC_MASK 0xFFFFFFFF
24 
 
25 
static int lookup_opcode PARAMS (( struct d30v_insn *insn, long num, int is_long ));
26 
static void print_insn PARAMS (( struct disassemble_info *info, bfd_vma memaddr, long long num,
27 
                                 struct d30v_insn *insn, int is_long, int show_ext ));
28 
static int extract_value PARAMS (( long long num, struct d30v_operand *oper, int is_long ));
29 
 
30 
int
31 
print_insn_d30v (memaddr, info)
32 
     bfd_vma memaddr;
33 
     struct disassemble_info *info;
34 
{
35 
  int status, result;
36 
  bfd_byte buffer[12];
37 
  unsigned long in1,in2;
38 
  struct d30v_insn insn;
39 
  long long num;
40 
 
41 
  insn.form = (struct d30v_format *)NULL;
42 
 
43 
  info->bytes_per_line = 8;
44 
  info->bytes_per_chunk = 4;
45 
  info->display_endian = BFD_ENDIAN_BIG;
46 
 
47 
  status = (*info->read_memory_func) (memaddr, buffer, 4, info);
48 
  if (status != 0)
49 
    {
50 
      (*info->memory_error_func) (status, memaddr, info);
51 
      return -1;
52 
    }
53 
  in1 = bfd_getb32 (buffer);
54 
 
55 
  status = (*info->read_memory_func) (memaddr+4, buffer, 4, info);
56 
  if (status != 0)
57 
    {
58 
      info->bytes_per_line = 8;
59 
      if (!(result = lookup_opcode(&insn, in1, 0)))
60 
        (*info->fprintf_func) (info->stream, ".long\t0x%x",in1);
61 
      else
62 
        print_insn(info, memaddr, (long long) in1, &insn, 0, result);
63 
      return 4;
64 
    }
65 
  in2 = bfd_getb32 (buffer);
66 
 
67 
  if (in1 & in2 & FM01)
68 
    {
69 
      /* LONG instruction */
70 
      if (!(result = lookup_opcode(&insn, in1, 1)))
71 
        {
72 
          (*info->fprintf_func) (info->stream, ".long\t0x%x,0x%x",in1,in2);
73 
          return 8;
74 
        }
75 
      num = (long long)in1 << 32 | in2;
76 
      print_insn(info, memaddr, num, &insn, 1, result);
77 
    }
78 
  else
79 
    {
80 
      num = in1;
81 
      if (!(result = lookup_opcode(&insn, in1, 0)))
82 
        (*info->fprintf_func) (info->stream, ".long\t0x%x",in1);
83 
      else
84 
        print_insn(info, memaddr, num, &insn, 0, result);
85 
 
86 
      switch ( ((in1>>31)<<1) | (in2>>31) )
87 
        {
88 
        case 0:
89 
          (*info->fprintf_func) (info->stream, "\t||\t");
90 
          break;
91 
        case 1:
92 
          (*info->fprintf_func) (info->stream, "\t->\t");
93 
          break;
94 
        case 2:
95 
          (*info->fprintf_func) (info->stream, "\t<-\t");
96 
        default:
97 
          break;
98 
        }
99 
 
100 
      insn.form = (struct d30v_format *)NULL;
101 
      num = in2;
102 
      if (!(result = lookup_opcode(&insn, in2, 0)))
103 
        (*info->fprintf_func) (info->stream, ".long\t0x%x",in2);
104 
      else
105 
        print_insn(info, memaddr, num, &insn, 0, result);
106 
 
107 
    }
108 
  return 8;
109 
}
110 
 
111 
 
112 
/* returns 0 if lookup fails */
113 
/* 1 if found and only one form */
114 
/* 2 if found and there are short and long forms */
115 
static int
116 
lookup_opcode (insn, num, is_long)
117 
     struct d30v_insn *insn;
118 
     long num;
119 
     int is_long;
120 
{
121 
  int i=0, index;
122 
  struct d30v_format *f;
123 
  struct d30v_opcode *op = (struct d30v_opcode *)d30v_opcode_table;
124 
  int op1 = (num >> 25) & 0x7;
125 
  int op2 = (num >> 20) & 0x1f;
126 
  int mod = (num >> 18) & 0x3;
127 
 
128 
  /* find the opcode */
129 
  do {
130 
    if ((op->op1 == op1) && (op->op2 == op2))
131 
      break;
132 
    op++;
133 
  } while (op->name);
134 
 
135 
  if (!op || !op->name)
136 
    return 0;
137 
 
138 
  while (op->op1 == op1 && op->op2 == op2)
139 
    {
140 
      /* scan through all the formats for the opcode  */
141 
      index = op->format[i++];
142 
      do
143 
        {
144 
          f = (struct d30v_format *)&d30v_format_table[index];
145 
          while (f->form == index)
146 
            {
147 
              if ((!is_long || f->form >= LONG) && (f->modifier == mod))
148 
                {
149 
                  insn->form = f;
150 
                  break;
151 
                }
152 
              f++;
153 
            }
154 
          if (insn->form)
155 
            break;
156 
        } while ((index = op->format[i++]) != 0);
157 
      if (insn->form)
158 
        break;
159 
      op++;
160 
      i=0;
161 
    }
162 
  if (insn->form == NULL)
163 
    return 0;
164 
 
165 
  insn->op = op;
166 
  insn->ecc = (num >> 28) & 0x7;
167 
  if (op->format[1])
168 
    return 2;
169 
  else
170 
    return 1;
171 
}
172 
 
173 
 
174 
static void
175 
print_insn ( info, memaddr, num, insn, is_long, show_ext )
176 
     struct disassemble_info *info;
177 
     bfd_vma memaddr;
178 
     long long num;
179 
     struct d30v_insn *insn;
180 
     int is_long;
181 
     int show_ext;
182 
{
183 
  int val, opnum, need_comma=0;
184 
  struct d30v_operand *oper;
185 
  int i, match, opind=0, need_paren=0, found_control=0;
186 
 
187 
  (*info->fprintf_func) (info->stream, "%s",insn->op->name);
188 
 
189 
  /* check for CMP or CMPU */
190 
  if (d30v_operand_table[insn->form->operands[0]].flags & OPERAND_NAME)
191 
    {
192 
      opind++;
193 
      val = extract_value(num,(struct d30v_operand *)&d30v_operand_table[insn->form->operands[0]],is_long);
194 
      (*info->fprintf_func) (info->stream, "%s",d30v_cc_names[val]);
195 
    }
196 
 
197 
  /* add in ".s" or ".l" */
198 
  if (show_ext == 2)
199 
    {
200 
      if (is_long)
201 
        (*info->fprintf_func) (info->stream, ".l");
202 
      else
203 
        (*info->fprintf_func) (info->stream, ".s");
204 
    }
205 
 
206 
  if (insn->ecc)
207 
    (*info->fprintf_func) (info->stream, "/%s",d30v_ecc_names[insn->ecc]);
208 
 
209 
  (*info->fprintf_func) (info->stream, "\t");
210 
 
211 
  while ((opnum = insn->form->operands[opind++]) != 0)
212 
    {
213 
      int bits;
214 
      oper = (struct d30v_operand *)&d30v_operand_table[opnum];
215 
      bits = oper->bits;
216 
      if (oper->flags & OPERAND_SHIFT)
217 
        bits += 3;
218 
 
219 
      if (need_comma && oper->flags != OPERAND_PLUS && oper->flags != OPERAND_MINUS)
220 
        {
221 
          need_comma=0;
222 
          (*info->fprintf_func) (info->stream, ", ");
223 
        }
224 
 
225 
      if (oper->flags == OPERAND_ATMINUS)
226 
        {
227 
          (*info->fprintf_func) (info->stream, "@-");
228 
          continue;
229 
        }
230 
      if (oper->flags == OPERAND_MINUS)
231 
        {
232 
          (*info->fprintf_func) (info->stream, "-");
233 
          continue;
234 
        }
235 
      if (oper->flags == OPERAND_PLUS)
236 
        {
237 
          (*info->fprintf_func) (info->stream, "+");
238 
          continue;
239 
        }
240 
      if (oper->flags == OPERAND_ATSIGN)
241 
        {
242 
          (*info->fprintf_func) (info->stream, "@");
243 
          continue;
244 
        }
245 
      if (oper->flags == OPERAND_ATPAR)
246 
        {
247 
          (*info->fprintf_func) (info->stream, "@(");
248 
          need_paren = 1;
249 
          continue;
250 
        }
251 
 
252 
      if (oper->flags == OPERAND_SPECIAL)
253 
        continue;
254 
 
255 
      val = extract_value(num, oper, is_long);
256 
 
257 
      if (oper->flags & OPERAND_REG)
258 
        {
259 
          match = 0;
260 
          if (oper->flags & OPERAND_CONTROL)
261 
            {
262 
              struct d30v_operand *oper3 =
263 
                (struct d30v_operand *)&d30v_operand_table[insn->form->operands[2]];
264 
              int id = extract_value (num, oper3, is_long );
265 
              found_control = 1;
266 
              switch ( id )
267 
                {
268 
                case 0:
269 
                  val |= OPERAND_CONTROL;
270 
                  break;
271 
                case 1:
272 
                case 2:
273 
                  val = OPERAND_CONTROL + MAX_CONTROL_REG + id;
274 
                  break;
275 
                case 3:
276 
                  val |= OPERAND_FLAG;
277 
                  break;
278 
                default:
279 
                  fprintf(stderr,"illegal id (%d)\n",id);
280 
                }
281 
            }
282 
          else if (oper->flags & OPERAND_ACC)
283 
            val |= OPERAND_ACC;
284 
          else if (oper->flags & OPERAND_FLAG)
285 
            val |= OPERAND_FLAG;
286 
          for (i=0;i<reg_name_cnt();i++)
287 
            {
288 
              if (val == pre_defined_registers[i].value)
289 
                {
290 
                  if (pre_defined_registers[i].pname)
291 
                    (*info->fprintf_func)
292 
                      (info->stream, "%s",pre_defined_registers[i].pname);
293 
                  else
294 
                    (*info->fprintf_func)
295 
                      (info->stream, "%s",pre_defined_registers[i].name);
296 
                  match=1;
297 
                  break;
298 
                }
299 
            }
300 
          if (match==0)
301 
            {
302 
              /* this would only get executed if a register was not in the
303 
                 register table */
304 
              (*info->fprintf_func)
305 
                (info->stream, _("<unknown register %d>"), val & 0x3F);
306 
            }
307 
        }
308 
      /* repeati has a relocation, but its first argument is a plain
309 
         immediate.  OTOH instructions like djsri have a pc-relative
310 
         delay target, but a absolute jump target.  Therefore, a test
311 
         of insn->op->reloc_flag is not specific enough; we must test
312 
         if the actual operand we are handling now is pc-relative.  */
313 
      else if (oper->flags & OPERAND_PCREL)
314 
        {
315 
          int neg = 0;
316 
 
317 
          /* IMM6S3 is unsigned.  */
318 
          if (oper->flags & OPERAND_SIGNED || bits == 32)
319 
            {
320 
              long max;
321 
              max = (1 << (bits - 1));
322 
              if (val & max)
323 
                {
324 
                  if (bits == 32)
325 
                    val = -val;
326 
                  else
327 
                    val = -val & ((1 << bits)-1);
328 
                  neg = 1;
329 
                }
330 
            }
331 
          if (neg)
332 
            {
333 
              (*info->fprintf_func) (info->stream, "-%x\t(",val);
334 
              (*info->print_address_func) ((memaddr - val) & PC_MASK, info);
335 
              (*info->fprintf_func) (info->stream, ")");
336 
            }
337 
          else
338 
            {
339 
              (*info->fprintf_func) (info->stream, "%x\t(",val);
340 
              (*info->print_address_func) ((memaddr + val) & PC_MASK, info);
341 
              (*info->fprintf_func) (info->stream, ")");
342 
            }
343 
        }
344 
      else if (insn->op->reloc_flag == RELOC_ABS)
345 
        {
346 
          (*info->print_address_func) (val, info);
347 
        }
348 
      else
349 
        {
350 
          if (oper->flags & OPERAND_SIGNED)
351 
            {
352 
              int max = (1 << (bits - 1));
353 
              if (val & max)
354 
                {
355 
                  val = -val;
356 
                  if (bits < 32)
357 
                    val &= ((1 << bits) - 1);
358 
                  (*info->fprintf_func) (info->stream, "-");
359 
                }
360 
            }
361 
          (*info->fprintf_func) (info->stream, "0x%x",val);
362 
        }
363 
      /* if there is another operand, then write a comma and space */
364 
      if (insn->form->operands[opind] && !(found_control && opind == 2))
365 
        need_comma = 1;
366 
    }
367 
  if (need_paren)
368 
    (*info->fprintf_func) (info->stream, ")");
369 
}
370 
 
371 
 
372 
 
373 
static int
374 
extract_value (num, oper, is_long)
375 
     long long num;
376 
     struct d30v_operand *oper;
377 
     int is_long;
378 
{
379 
  int val;
380 
  int shift = 12 - oper->position;
381 
  int mask = (0xFFFFFFFF >> (32 - oper->bits));
382 
 
383 
  if (is_long)
384 
    {
385 
      if (oper->bits == 32)
386 
        {
387 
          /* piece together 32-bit constant */
388 
          val = ((num & 0x3FFFF)
389 
                 | ((num & 0xFF00000) >> 2)
390 
                 | ((num & 0x3F00000000LL) >> 6));
391 
        }
392 
      else
393 
        val = (num >> (32 + shift)) & mask;
394 
    }
395 
  else
396 
    val = (num >> shift) & mask;
397 
 
398 
  if (oper->flags & OPERAND_SHIFT)
399 
    val <<= 3;
400 
 
401 
  return val;
402 
}

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