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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.2/] [opcodes/] [or32-dis.c] - Blame information for rev 330

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Line No. Rev Author Line
1 330 jeremybenn
/* Instruction printing code for the OpenRISC 1000
2
   Copyright (C) 2002, 2005, 2007 Free Software Foundation, Inc.
3
   Contributed by Damjan Lampret <lampret@opencores.org>.
4
   Modified from a29k port.
5
 
6
   This file is part of the GNU opcodes library.
7
 
8
   This library is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
10
   the Free Software Foundation; either version 3, or (at your option)
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   any later version.
12
 
13
   It is distributed in the hope that it will be useful, but WITHOUT
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   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
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   License for more details.
17
 
18
   You should have received a copy of the GNU General Public License
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   along with this program; if not, write to the Free Software
20
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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   MA 02110-1301, USA.  */
22
 
23
#define DEBUG 0
24
 
25
#include "dis-asm.h"
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#include "opcode/or32.h"
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#include "safe-ctype.h"
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#include <string.h>
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#include <stdlib.h>
30
 
31
#define EXTEND29(x) ((x) & (unsigned long) 0x10000000 ? ((x) | (unsigned long) 0xf0000000) : ((x)))
32
 
33
/* Now find the four bytes of INSN_CH and put them in *INSN.  */
34
 
35
static void
36
find_bytes_big (unsigned char *insn_ch, unsigned long *insn)
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{
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  *insn =
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    ((unsigned long) insn_ch[0] << 24) +
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    ((unsigned long) insn_ch[1] << 16) +
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    ((unsigned long) insn_ch[2] << 8) +
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    ((unsigned long) insn_ch[3]);
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#if DEBUG
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  printf ("find_bytes_big3: %x\n", *insn);
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#endif
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}
47
 
48
static void
49
find_bytes_little (unsigned char *insn_ch, unsigned long *insn)
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{
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  *insn =
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    ((unsigned long) insn_ch[3] << 24) +
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    ((unsigned long) insn_ch[2] << 16) +
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    ((unsigned long) insn_ch[1] << 8) +
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    ((unsigned long) insn_ch[0]);
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}
57
 
58
typedef void (*find_byte_func_type) (unsigned char *, unsigned long *);
59
 
60
static unsigned long
61
or32_extract (char param_ch, char *enc_initial, unsigned long insn)
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{
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  char *enc;
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  unsigned long ret = 0;
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  int opc_pos = 0;
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  int param_pos = 0;
67
 
68
  for (enc = enc_initial; *enc != '\0'; enc++)
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    if (*enc == param_ch)
70
      {
71
        if (enc - 2 >= enc_initial && (*(enc - 2) == '0') && (*(enc - 1) == 'x'))
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          continue;
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        else
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          param_pos++;
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      }
76
 
77
#if DEBUG
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  printf ("or32_extract: %c %x ", param_ch, param_pos);
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#endif
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  opc_pos = 32;
81
 
82
  for (enc = enc_initial; *enc != '\0'; )
83
    if ((*enc == '0') && (*(enc + 1) == 'x'))
84
      {
85
        opc_pos -= 4;
86
 
87
        if ((param_ch == '0') || (param_ch == '1'))
88
          {
89
            unsigned long tmp = strtoul (enc, NULL, 16);
90
#if DEBUG
91
            printf (" enc=%s, tmp=%x ", enc, tmp);
92
#endif
93
            if (param_ch == '0')
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              tmp = 15 - tmp;
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            ret |= tmp << opc_pos;
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          }
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        enc += 3;
98
      }
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    else if ((*enc == '0') || (*enc == '1'))
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      {
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        opc_pos--;
102
        if (param_ch == *enc)
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          ret |= 1 << opc_pos;
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        enc++;
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      }
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    else if (*enc == param_ch)
107
      {
108
        opc_pos--;
109
        param_pos--;
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#if DEBUG
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        printf ("\n  ret=%x opc_pos=%x, param_pos=%x\n", ret, opc_pos, param_pos);
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#endif
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        ret += ((insn >> opc_pos) & 0x1) << param_pos;
114
 
115
        if (!param_pos
116
            && letter_signed (param_ch)
117
            && ret >> (letter_range (param_ch) - 1))
118
          {
119
#if DEBUG
120
            printf ("\n  ret=%x opc_pos=%x, param_pos=%x\n",
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                    ret, opc_pos, param_pos);
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#endif
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            ret |= 0xffffffff << letter_range(param_ch);
124
#if DEBUG
125
            printf ("\n  after conversion to signed: ret=%x\n", ret);
126
#endif
127
          }
128
        enc++;
129
      }
130
    else if (ISALPHA (*enc))
131
      {
132
        opc_pos--;
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        enc++;
134
      }
135
    else if (*enc == '-')
136
      {
137
        opc_pos--;
138
        enc++;
139
      }
140
    else
141
      enc++;
142
 
143
#if DEBUG
144
  printf ("ret=%x\n", ret);
145
#endif
146
  return ret;
147
}
148
 
149
static int
150
or32_opcode_match (unsigned long insn, char *encoding)
151
{
152
  unsigned long ones, zeros;
153
 
154
#if DEBUG
155
  printf ("or32_opcode_match: %.8lx\n", insn);
156
#endif    
157
  ones  = or32_extract ('1', encoding, insn);
158
  zeros = or32_extract ('0', encoding, insn);
159
 
160
#if DEBUG
161
  printf ("ones: %x \n", ones);
162
  printf ("zeros: %x \n", zeros);
163
#endif
164
  if ((insn & ones) != ones)
165
    {
166
#if DEBUG
167
      printf ("ret1\n");
168
#endif
169
      return 0;
170
    }
171
 
172
  if ((~insn & zeros) != zeros)
173
    {
174
#if DEBUG
175
      printf ("ret2\n");
176
#endif
177
      return 0;
178
    }
179
 
180
#if DEBUG
181
  printf ("ret3\n");
182
#endif
183
  return 1;
184
}
185
 
186
/* Print register to INFO->STREAM. Used only by print_insn.  */
187
 
188
static void
189
or32_print_register (char param_ch,
190
                     char *encoding,
191
                     unsigned long insn,
192
                     struct disassemble_info *info)
193
{
194
  int regnum = or32_extract (param_ch, encoding, insn);
195
 
196
#if DEBUG
197
  printf ("or32_print_register: %c, %s, %x\n", param_ch, encoding, insn);
198
#endif  
199
  if (param_ch == 'A')
200
    (*info->fprintf_func) (info->stream, "r%d", regnum);
201
  else if (param_ch == 'B')
202
    (*info->fprintf_func) (info->stream, "r%d", regnum);
203
  else if (param_ch == 'D')
204
    (*info->fprintf_func) (info->stream, "r%d", regnum);
205
  else if (regnum < 16)
206
    (*info->fprintf_func) (info->stream, "r%d", regnum);
207
  else if (regnum < 32)
208
    (*info->fprintf_func) (info->stream, "r%d", regnum-16);
209
  else
210
    (*info->fprintf_func) (info->stream, "X%d", regnum);
211
}
212
 
213
/* Print immediate to INFO->STREAM. Used only by print_insn.  */
214
 
215
static void
216
or32_print_immediate (char param_ch,
217
                      char *encoding,
218
                      unsigned long insn,
219
                      struct disassemble_info *info)
220
{
221
  int imm = or32_extract(param_ch, encoding, insn);
222
 
223
  if (letter_signed(param_ch))
224
    (*info->fprintf_func) (info->stream, "0x%x", imm);
225
/*    (*info->fprintf_func) (info->stream, "%d", imm); */
226
  else
227
    (*info->fprintf_func) (info->stream, "0x%x", imm);
228
}
229
 
230
/* Print one instruction from MEMADDR on INFO->STREAM.
231
   Return the size of the instruction (always 4 on or32).  */
232
 
233
static int
234
print_insn (bfd_vma memaddr, struct disassemble_info *info)
235
{
236
  /* The raw instruction.  */
237
  unsigned char insn_ch[4];
238
  /* Address. Will be sign extened 27-bit.  */
239
  unsigned long addr;
240
  /* The four bytes of the instruction.  */
241
  unsigned long insn;
242
  find_byte_func_type find_byte_func = (find_byte_func_type) info->private_data;
243
  struct or32_opcode const * opcode;
244
 
245
  {
246
    int status =
247
      (*info->read_memory_func) (memaddr, (bfd_byte *) &insn_ch[0], 4, info);
248
 
249
    if (status != 0)
250
      {
251
        (*info->memory_error_func) (status, memaddr, info);
252
        return -1;
253
      }
254
  }
255
 
256
  (*find_byte_func) (&insn_ch[0], &insn);
257
 
258
  for (opcode = &or32_opcodes[0];
259
       opcode < &or32_opcodes[or32_num_opcodes];
260
       ++opcode)
261
    {
262
      if (or32_opcode_match (insn, opcode->encoding))
263
        {
264
          char *s;
265
 
266
          (*info->fprintf_func) (info->stream, "%s ", opcode->name);
267
 
268
          for (s = opcode->args; *s != '\0'; ++s)
269
            {
270
              switch (*s)
271
                {
272
                case '\0':
273
                  return 4;
274
 
275
                case 'r':
276
                  or32_print_register (*++s, opcode->encoding, insn, info);
277
                  break;
278
 
279
                case 'X':
280
                  addr = or32_extract ('X', opcode->encoding, insn) << 2;
281
 
282
                  /* Calulate the correct address.  XXX is this really correct ??  */
283
                  addr = memaddr + EXTEND29 (addr);
284
 
285
                  (*info->print_address_func)
286
                    (addr, info);
287
                  break;
288
 
289
                default:
290
                  if (strchr (opcode->encoding, *s))
291
                    or32_print_immediate (*s, opcode->encoding, insn, info);
292
                  else
293
                    (*info->fprintf_func) (info->stream, "%c", *s);
294
                }
295
            }
296
 
297
          return 4;
298
        }
299
    }
300
 
301
  /* This used to be %8x for binutils.  */
302
  (*info->fprintf_func)
303
    (info->stream, ".word 0x%08lx", insn);
304
  return 4;
305
}
306
 
307
/* Disassemble a big-endian or32 instruction.  */
308
 
309
int
310
print_insn_big_or32 (bfd_vma memaddr, struct disassemble_info *info)
311
{
312
  info->private_data = find_bytes_big;
313
 
314
  return print_insn (memaddr, info);
315
}
316
 
317
/* Disassemble a little-endian or32 instruction.  */
318
 
319
int
320
print_insn_little_or32 (bfd_vma memaddr, struct disassemble_info *info)
321
{
322
  info->private_data = find_bytes_little;
323
  return print_insn (memaddr, info);
324
}

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