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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [opcodes/] [h8500-dis.c] - Blame information for rev 157

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1 24 jeremybenn 
/* Disassemble h8500 instructions.
2 
   Copyright 1993, 1998, 2000, 2001, 2002, 2004, 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 
 
24 
#define DISASSEMBLER_TABLE
25 
#define DEFINE_TABLE
26 
 
27 
#include "sysdep.h"
28 
#include "h8500-opc.h"
29 
#include "dis-asm.h"
30 
#include "opintl.h"
31 
 
32 
/* Maximum length of an instruction.  */
33 
#define MAXLEN 8
34 
 
35 
#include <setjmp.h>
36 
 
37 
struct private
38 
{
39 
  /* Points to first byte not fetched.  */
40 
  bfd_byte *max_fetched;
41 
  bfd_byte the_buffer[MAXLEN];
42 
  bfd_vma insn_start;
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  jmp_buf bailout;
44 
};
45 
 
46 
/* Make sure that bytes from INFO->PRIVATE_DATA->BUFFER (inclusive)
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   to ADDR (exclusive) are valid.  Returns 1 for success, longjmps
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   on error.  */
49 
#define FETCH_DATA(info, addr) \
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  ((addr) <= ((struct private *)(info->private_data))->max_fetched \
51 
   ? 1 : fetch_data ((info), (addr)))
52 
 
53 
static int
54 
fetch_data (struct disassemble_info *info, bfd_byte *addr)
55 
{
56 
  int status;
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  struct private *priv = (struct private *) info->private_data;
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  bfd_vma start = priv->insn_start + (priv->max_fetched - priv->the_buffer);
59 
 
60 
  status = (*info->read_memory_func) (start,
61 
                                      priv->max_fetched,
62 
                                      addr - priv->max_fetched,
63 
                                      info);
64 
  if (status != 0)
65 
    {
66 
      (*info->memory_error_func) (status, start, info);
67 
      longjmp (priv->bailout, 1);
68 
    }
69 
  else
70 
    priv->max_fetched = addr;
71 
  return 1;
72 
}
73 
 
74 
static char *crname[] = { "sr", "ccr", "*", "br", "ep", "dp", "*", "tp" };
75 
 
76 
int
77 
print_insn_h8500 (bfd_vma addr, disassemble_info *info)
78 
{
79 
  const h8500_opcode_info *opcode;
80 
  void *stream = info->stream;
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  fprintf_ftype func = info->fprintf_func;
82 
  struct private priv;
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  bfd_byte *buffer = priv.the_buffer;
84 
 
85 
  info->private_data = (PTR) & priv;
86 
  priv.max_fetched = priv.the_buffer;
87 
  priv.insn_start = addr;
88 
  if (setjmp (priv.bailout) != 0)
89 
    /* Error return.  */
90 
    return -1;
91 
 
92 
  /* Run down the table to find the one which matches.  */
93 
  for (opcode = h8500_table; opcode->name; opcode++)
94 
    {
95 
      int byte;
96 
      int rn = 0;
97 
      int rd = 0;
98 
      int rs = 0;
99 
      int disp = 0;
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      int abs = 0;
101 
      int imm = 0;
102 
      int pcrel = 0;
103 
      int qim = 0;
104 
      int i;
105 
      int cr = 0;
106 
 
107 
      for (byte = 0; byte < opcode->length; byte++)
108 
        {
109 
          FETCH_DATA (info, buffer + byte + 1);
110 
          if ((buffer[byte] & opcode->bytes[byte].mask)
111 
              != (opcode->bytes[byte].contents))
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            goto next;
113 
 
114 
          else
115 
            {
116 
              /* Extract any info parts.  */
117 
              switch (opcode->bytes[byte].insert)
118 
                {
119 
                case 0:
120 
                case FP:
121 
                  break;
122 
                default:
123 
                  /* xgettext:c-format */
124 
                  func (stream, _("can't cope with insert %d\n"),
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                        opcode->bytes[byte].insert);
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                  break;
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                case RN:
128 
                  rn = buffer[byte] & 0x7;
129 
                  break;
130 
                case RS:
131 
                  rs = buffer[byte] & 0x7;
132 
                  break;
133 
                case CRB:
134 
                  cr = buffer[byte] & 0x7;
135 
                  if (cr == 0)
136 
                    goto next;
137 
                  break;
138 
                case CRW:
139 
                  cr = buffer[byte] & 0x7;
140 
                  if (cr != 0)
141 
                    goto next;
142 
                  break;
143 
                case DISP16:
144 
                  FETCH_DATA (info, buffer + byte + 2);
145 
                  disp = (buffer[byte] << 8) | (buffer[byte + 1]);
146 
                  break;
147 
                case FPIND_D8:
148 
                case DISP8:
149 
                  disp = ((char) (buffer[byte]));
150 
                  break;
151 
                case RD:
152 
                case RDIND:
153 
                  rd = buffer[byte] & 0x7;
154 
                  break;
155 
                case ABS24:
156 
                  FETCH_DATA (info, buffer + byte + 3);
157 
                  abs =
158 
                    (buffer[byte] << 16)
159 
                    | (buffer[byte + 1] << 8)
160 
                    | (buffer[byte + 2]);
161 
                  break;
162 
                case ABS16:
163 
                  FETCH_DATA (info, buffer + byte + 2);
164 
                  abs = (buffer[byte] << 8) | (buffer[byte + 1]);
165 
                  break;
166 
                case ABS8:
167 
                  abs = (buffer[byte]);
168 
                  break;
169 
                case IMM16:
170 
                  FETCH_DATA (info, buffer + byte + 2);
171 
                  imm = (buffer[byte] << 8) | (buffer[byte + 1]);
172 
                  break;
173 
                case IMM4:
174 
                  imm = (buffer[byte]) & 0xf;
175 
                  break;
176 
                case IMM8:
177 
                case RLIST:
178 
                  imm = (buffer[byte]);
179 
                  break;
180 
                case PCREL16:
181 
                  FETCH_DATA (info, buffer + byte + 2);
182 
                  pcrel = (buffer[byte] << 8) | (buffer[byte + 1]);
183 
                  break;
184 
                case PCREL8:
185 
                  pcrel = (buffer[byte]);
186 
                  break;
187 
                case QIM:
188 
                  switch (buffer[byte] & 0x7)
189 
                    {
190 
                    case 0:
191 
                      qim = 1;
192 
                      break;
193 
                    case 1:
194 
                      qim = 2;
195 
                      break;
196 
                    case 4:
197 
                      qim = -1;
198 
                      break;
199 
                    case 5:
200 
                      qim = -2;
201 
                      break;
202 
                    }
203 
                  break;
204 
 
205 
                }
206 
            }
207 
        }
208 
      /* We get here when all the masks have passed so we can output
209 
         the operands.  */
210 
      FETCH_DATA (info, buffer + opcode->length);
211 
      (func) (stream, "%s\t", opcode->name);
212 
      for (i = 0; i < opcode->nargs; i++)
213 
        {
214 
          if (i)
215 
            (func) (stream, ",");
216 
          switch (opcode->arg_type[i])
217 
            {
218 
            case FP:
219 
              func (stream, "fp");
220 
              break;
221 
            case RNIND_D16:
222 
              func (stream, "@(0x%x:16,r%d)", disp, rn);
223 
              break;
224 
            case RNIND_D8:
225 
              func (stream, "@(0x%x:8 (%d),r%d)", disp & 0xff, disp, rn);
226 
              break;
227 
            case RDIND_D16:
228 
              func (stream, "@(0x%x:16,r%d)", disp, rd);
229 
              break;
230 
            case RDIND_D8:
231 
              func (stream, "@(0x%x:8 (%d), r%d)", disp & 0xff, disp, rd);
232 
              break;
233 
            case FPIND_D8:
234 
              func (stream, "@(0x%x:8 (%d), fp)", disp & 0xff, disp);
235 
              break;
236 
            case CRB:
237 
            case CRW:
238 
              func (stream, "%s", crname[cr]);
239 
              break;
240 
            case RN:
241 
              func (stream, "r%d", rn);
242 
              break;
243 
            case RD:
244 
              func (stream, "r%d", rd);
245 
              break;
246 
            case RS:
247 
              func (stream, "r%d", rs);
248 
              break;
249 
            case RNDEC:
250 
              func (stream, "@-r%d", rn);
251 
              break;
252 
            case RNINC:
253 
              func (stream, "@r%d+", rn);
254 
              break;
255 
            case RNIND:
256 
              func (stream, "@r%d", rn);
257 
              break;
258 
            case RDIND:
259 
              func (stream, "@r%d", rd);
260 
              break;
261 
            case SPINC:
262 
              func (stream, "@sp+");
263 
              break;
264 
            case SPDEC:
265 
              func (stream, "@-sp");
266 
              break;
267 
            case ABS24:
268 
              func (stream, "@0x%0x:24", abs);
269 
              break;
270 
            case ABS16:
271 
              func (stream, "@0x%0x:16", abs & 0xffff);
272 
              break;
273 
            case ABS8:
274 
              func (stream, "@0x%0x:8", abs & 0xff);
275 
              break;
276 
            case IMM16:
277 
              func (stream, "#0x%0x:16", imm & 0xffff);
278 
              break;
279 
            case RLIST:
280 
              {
281 
                int i;
282 
                int nc = 0;
283 
 
284 
                func (stream, "(");
285 
                for (i = 0; i < 8; i++)
286 
                  {
287 
                    if (imm & (1 << i))
288 
                      {
289 
                        func (stream, "r%d", i);
290 
                        if (nc)
291 
                          func (stream, ",");
292 
                        nc = 1;
293 
                      }
294 
                  }
295 
                func (stream, ")");
296 
              }
297 
              break;
298 
            case IMM8:
299 
              func (stream, "#0x%0x:8", imm & 0xff);
300 
              break;
301 
            case PCREL16:
302 
              func (stream, "0x%0x:16",
303 
                    (int)(pcrel + addr + opcode->length) & 0xffff);
304 
              break;
305 
            case PCREL8:
306 
              func (stream, "#0x%0x:8",
307 
                    (int)((char) pcrel + addr + opcode->length) & 0xffff);
308 
              break;
309 
            case QIM:
310 
              func (stream, "#%d:q", qim);
311 
              break;
312 
            case IMM4:
313 
              func (stream, "#%d:4", imm);
314 
              break;
315 
            }
316 
        }
317 
      return opcode->length;
318 
    next:
319 
      ;
320 
    }
321 
 
322 
  /* Couldn't understand anything.  */
323 
  /* xgettext:c-format */
324 
  func (stream, _("%02x\t\t*unknown*"), buffer[0]);
325 
  return 1;
326 
}

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