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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [opcodes/] [mcore-dis.c] - Blame information for rev 24

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1 24 jeremybenn 
/* Disassemble Motorola M*Core instructions.
2 
   Copyright 1993, 1999, 2000, 2001, 2002, 2007 Free Software Foundation, Inc.
3 
 
4 
   This file is part of the GNU opcodes library.
5 
 
6 
   This library is free software; you can redistribute it and/or modify
7 
   it under the terms of the GNU General Public License as published by
8 
   the Free Software Foundation; either version 3, or (at your option)
9 
   any later version.
10 
 
11 
   It is distributed in the hope that it will be useful, but WITHOUT
12 
   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 
   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
14 
   License for more details.
15 
 
16 
   You should have received a copy of the GNU General Public License
17 
   along with this program; if not, write to the Free Software
18 
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 
   MA 02110-1301, USA.  */
20 
 
21 
#include "sysdep.h"
22 
#include <stdio.h>
23 
#define STATIC_TABLE
24 
#define DEFINE_TABLE
25 
 
26 
#include "mcore-opc.h"
27 
#include "dis-asm.h"
28 
 
29 
/* Mask for each mcore_opclass: */
30 
static const unsigned short imsk[] = {
31 
    /* O0  */ 0xFFFF,
32 
    /* OT  */ 0xFFFC,
33 
    /* O1  */ 0xFFF0,
34 
    /* OC  */ 0xFE00,
35 
    /* O2  */ 0xFF00,
36 
    /* X1  */ 0xFFF0,
37 
    /* OI  */ 0xFE00,
38 
    /* OB  */ 0xFE00,
39 
 
40 
    /* OMa */ 0xFFF0,
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    /* SI  */ 0xFE00,
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    /* I7  */ 0xF800,
43 
    /* LS  */ 0xF000,
44 
    /* BR  */ 0xF800,
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    /* BL  */ 0xFF00,
46 
    /* LR  */ 0xF000,
47 
    /* LJ  */ 0xFF00,
48 
 
49 
    /* RM  */ 0xFFF0,
50 
    /* RQ  */ 0xFFF0,
51 
    /* JSR */ 0xFFF0,
52 
    /* JMP */ 0xFFF0,
53 
    /* OBRa*/ 0xFFF0,
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    /* OBRb*/ 0xFF80,
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    /* OBRc*/ 0xFF00,
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    /* OBR2*/ 0xFE00,
57 
 
58 
    /* O1R1*/ 0xFFF0,
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    /* OMb */ 0xFF80,
60 
    /* OMc */ 0xFF00,
61 
    /* SIa */ 0xFE00,
62 
 
63 
  /* MULSH */ 0xFF00,
64 
  /* OPSR  */ 0xFFF8,   /* psrset/psrclr */
65 
 
66 
    /* JC  */ 0,         /* JC,JU,JL don't appear in object */
67 
    /* JU  */ 0,
68 
    /* JL  */ 0,
69 
    /* RSI */ 0,
70 
    /* DO21*/ 0,
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    /* OB2 */ 0          /* OB2 won't appear in object.  */
72 
};
73 
 
74 
static const char *grname[] = {
75 
 "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",
76 
 "r8",  "r9", "r10", "r11", "r12", "r13", "r14", "r15"
77 
};
78 
 
79 
static const char X[] = "??";
80 
 
81 
static const char *crname[] = {
82 
  "psr",  "vbr", "epsr", "fpsr", "epc",  "fpc",  "ss0",  "ss1",
83 
  "ss2",  "ss3", "ss4",  "gcr",  "gsr",     X,      X,      X,
84 
     X,      X,      X,      X,      X,     X,      X,      X,
85 
     X,      X,      X,      X,      X,     X,      X,      X
86 
};
87 
 
88 
static const unsigned isiz[] = { 2, 0, 1, 0 };
89 
 
90 
int
91 
print_insn_mcore (memaddr, info)
92 
     bfd_vma memaddr;
93 
     struct disassemble_info *info;
94 
{
95 
  unsigned char ibytes[4];
96 
  fprintf_ftype fprintf = info->fprintf_func;
97 
  void *stream = info->stream;
98 
  unsigned short inst;
99 
  const mcore_opcode_info *op;
100 
  int status;
101 
 
102 
  info->bytes_per_chunk = 2;
103 
 
104 
  status = info->read_memory_func (memaddr, ibytes, 2, info);
105 
 
106 
  if (status != 0)
107 
    {
108 
      info->memory_error_func (status, memaddr, info);
109 
      return -1;
110 
    }
111 
 
112 
  if (info->endian == BFD_ENDIAN_BIG)
113 
    inst = (ibytes[0] << 8) | ibytes[1];
114 
  else if (info->endian == BFD_ENDIAN_LITTLE)
115 
    inst = (ibytes[1] << 8) | ibytes[0];
116 
  else
117 
    abort ();
118 
 
119 
  /* Just a linear search of the table.  */
120 
  for (op = mcore_table; op->name != 0; op++)
121 
    if (op->inst == (inst & imsk[op->opclass]))
122 
      break;
123 
 
124 
  if (op->name == 0)
125 
    (*fprintf) (stream, ".short 0x%04x", inst);
126 
  else
127 
    {
128 
      const char *name = grname[inst & 0x0F];
129 
 
130 
      (*fprintf) (stream, "%s", op->name);
131 
 
132 
      switch (op->opclass)
133 
        {
134 
        case O0:
135 
          break;
136 
 
137 
        case OT:
138 
          (*fprintf) (stream, "\t%d", inst & 0x3);
139 
          break;
140 
 
141 
        case O1:
142 
        case JMP:
143 
        case JSR:
144 
          (*fprintf) (stream, "\t%s", name);
145 
          break;
146 
 
147 
        case OC:
148 
          (*fprintf) (stream, "\t%s, %s", name, crname[(inst >> 4) & 0x1F]);
149 
          break;
150 
 
151 
        case O1R1:
152 
          (*fprintf) (stream, "\t%s, r1", name);
153 
          break;
154 
 
155 
        case MULSH:
156 
        case O2:
157 
          (*fprintf) (stream, "\t%s, %s", name, grname[(inst >> 4) & 0xF]);
158 
          break;
159 
 
160 
        case X1:
161 
          (*fprintf) (stream, "\tr1, %s", name);
162 
          break;
163 
 
164 
        case OI:
165 
          (*fprintf) (stream, "\t%s, %d", name, ((inst >> 4) & 0x1F) + 1);
166 
          break;
167 
 
168 
        case RM:
169 
          (*fprintf) (stream, "\t%s-r15, (r0)", name);
170 
          break;
171 
 
172 
        case RQ:
173 
          (*fprintf) (stream, "\tr4-r7, (%s)", name);
174 
          break;
175 
 
176 
        case OB:
177 
        case OBRa:
178 
        case OBRb:
179 
        case OBRc:
180 
        case SI:
181 
        case SIa:
182 
        case OMa:
183 
        case OMb:
184 
        case OMc:
185 
          (*fprintf) (stream, "\t%s, %d", name, (inst >> 4) & 0x1F);
186 
          break;
187 
 
188 
        case I7:
189 
          (*fprintf) (stream, "\t%s, %d", name, (inst >> 4) & 0x7F);
190 
          break;
191 
 
192 
        case LS:
193 
          (*fprintf) (stream, "\t%s, (%s, %d)", grname[(inst >> 8) & 0xF],
194 
                      name, ((inst >> 4) & 0xF) << isiz[(inst >> 13) & 3]);
195 
          break;
196 
 
197 
        case BR:
198 
          {
199 
            long val = inst & 0x3FF;
200 
 
201 
            if (inst & 0x400)
202 
              val |= 0xFFFFFC00;
203 
 
204 
            (*fprintf) (stream, "\t0x%lx", (long)(memaddr + 2 + (val << 1)));
205 
 
206 
            if (strcmp (op->name, "bsr") == 0)
207 
              {
208 
                /* For bsr, we'll try to get a symbol for the target.  */
209 
                val = memaddr + 2 + (val << 1);
210 
 
211 
                if (info->print_address_func && val != 0)
212 
                  {
213 
                    (*fprintf) (stream, "\t// ");
214 
                    info->print_address_func (val, info);
215 
                  }
216 
              }
217 
          }
218 
          break;
219 
 
220 
        case BL:
221 
          {
222 
            long val;
223 
            val = (inst & 0x000F);
224 
            (*fprintf) (stream, "\t%s, 0x%lx",
225 
                        grname[(inst >> 4) & 0xF],
226 
                        (long) (memaddr - (val << 1)));
227 
          }
228 
          break;
229 
 
230 
        case LR:
231 
          {
232 
            unsigned long val;
233 
 
234 
            val = (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC;
235 
 
236 
            status = info->read_memory_func (val, ibytes, 4, info);
237 
            if (status != 0)
238 
              {
239 
                info->memory_error_func (status, memaddr, info);
240 
                break;
241 
              }
242 
 
243 
            if (info->endian == BFD_ENDIAN_LITTLE)
244 
              val = (ibytes[3] << 24) | (ibytes[2] << 16)
245 
                | (ibytes[1] << 8) | (ibytes[0]);
246 
            else
247 
              val = (ibytes[0] << 24) | (ibytes[1] << 16)
248 
                | (ibytes[2] << 8) | (ibytes[3]);
249 
 
250 
            /* Removed [] around literal value to match ABI syntax 12/95.  */
251 
            (*fprintf) (stream, "\t%s, 0x%lX", grname[(inst >> 8) & 0xF], val);
252 
 
253 
            if (val == 0)
254 
              (*fprintf) (stream, "\t// from address pool at 0x%lx",
255 
                          (long) (memaddr + 2
256 
                                  + ((inst & 0xFF) << 2)) & 0xFFFFFFFC);
257 
          }
258 
          break;
259 
 
260 
        case LJ:
261 
          {
262 
            unsigned long val;
263 
 
264 
            val = (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC;
265 
 
266 
            status = info->read_memory_func (val, ibytes, 4, info);
267 
            if (status != 0)
268 
              {
269 
                info->memory_error_func (status, memaddr, info);
270 
                break;
271 
              }
272 
 
273 
            if (info->endian == BFD_ENDIAN_LITTLE)
274 
              val = (ibytes[3] << 24) | (ibytes[2] << 16)
275 
                | (ibytes[1] << 8) | (ibytes[0]);
276 
            else
277 
              val = (ibytes[0] << 24) | (ibytes[1] << 16)
278 
                | (ibytes[2] << 8) | (ibytes[3]);
279 
 
280 
            /* Removed [] around literal value to match ABI syntax 12/95.  */
281 
            (*fprintf) (stream, "\t0x%lX", val);
282 
            /* For jmpi/jsri, we'll try to get a symbol for the target.  */
283 
            if (info->print_address_func && val != 0)
284 
              {
285 
                (*fprintf) (stream, "\t// ");
286 
                info->print_address_func (val, info);
287 
              }
288 
            else
289 
              {
290 
                (*fprintf) (stream, "\t// from address pool at 0x%lx",
291 
                            (long) (memaddr + 2
292 
                                    + ((inst & 0xFF) << 2)) & 0xFFFFFFFC);
293 
              }
294 
          }
295 
          break;
296 
 
297 
        case OPSR:
298 
          {
299 
            static char *fields[] = {
300 
              "af", "ie",    "fe",    "fe,ie",
301 
              "ee", "ee,ie", "ee,fe", "ee,fe,ie"
302 
            };
303 
 
304 
            (*fprintf) (stream, "\t%s", fields[inst & 0x7]);
305 
          }
306 
          break;
307 
 
308 
        default:
309 
          /* If the disassembler lags the instruction set.  */
310 
          (*fprintf) (stream, "\tundecoded operands, inst is 0x%04x", inst);
311 
          break;
312 
        }
313 
    }
314 
 
315 
  /* Say how many bytes we consumed.  */
316 
  return 2;
317 
}

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