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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-7.1/] [opcodes/] [mcore-dis.c] - Blame information for rev 830

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1 227 jeremybenn 
/* Disassemble Motorola M*Core instructions.
2 
   Copyright 1993, 1999, 2000, 2001, 2002, 2005, 2007, 2009
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
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   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
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   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 "sysdep.h"
23 
#include <stdio.h>
24 
#define STATIC_TABLE
25 
#define DEFINE_TABLE
26 
 
27 
#include "mcore-opc.h"
28 
#include "dis-asm.h"
29 
 
30 
/* Mask for each mcore_opclass: */
31 
static const unsigned short imsk[] = {
32 
    /* O0  */ 0xFFFF,
33 
    /* OT  */ 0xFFFC,
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    /* O1  */ 0xFFF0,
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    /* OC  */ 0xFE00,
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    /* O2  */ 0xFF00,
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    /* X1  */ 0xFFF0,
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    /* OI  */ 0xFE00,
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    /* OB  */ 0xFE00,
40 
 
41 
    /* OMa */ 0xFFF0,
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    /* SI  */ 0xFE00,
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    /* I7  */ 0xF800,
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    /* LS  */ 0xF000,
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    /* BR  */ 0xF800,
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    /* BL  */ 0xFF00,
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    /* LR  */ 0xF000,
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    /* LJ  */ 0xFF00,
49 
 
50 
    /* RM  */ 0xFFF0,
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    /* RQ  */ 0xFFF0,
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    /* JSR */ 0xFFF0,
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    /* JMP */ 0xFFF0,
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    /* OBRa*/ 0xFFF0,
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    /* OBRb*/ 0xFF80,
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    /* OBRc*/ 0xFF00,
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    /* OBR2*/ 0xFE00,
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59 
    /* O1R1*/ 0xFFF0,
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    /* OMb */ 0xFF80,
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    /* OMc */ 0xFF00,
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    /* SIa */ 0xFE00,
63 
 
64 
  /* MULSH */ 0xFF00,
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  /* OPSR  */ 0xFFF8,   /* psrset/psrclr */
66 
 
67 
    /* JC  */ 0,         /* JC,JU,JL don't appear in object */
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    /* JU  */ 0,
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    /* JL  */ 0,
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    /* RSI */ 0,
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    /* DO21*/ 0,
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    /* OB2 */ 0          /* OB2 won't appear in object.  */
73 
};
74 
 
75 
static const char *grname[] = {
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 "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",
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 "r8",  "r9", "r10", "r11", "r12", "r13", "r14", "r15"
78 
};
79 
 
80 
static const char X[] = "??";
81 
 
82 
static const char *crname[] = {
83 
  "psr",  "vbr", "epsr", "fpsr", "epc",  "fpc",  "ss0",  "ss1",
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  "ss2",  "ss3", "ss4",  "gcr",  "gsr",     X,      X,      X,
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     X,      X,      X,      X,      X,     X,      X,      X,
86 
     X,      X,      X,      X,      X,     X,      X,      X
87 
};
88 
 
89 
static const unsigned isiz[] = { 2, 0, 1, 0 };
90 
 
91 
int
92 
print_insn_mcore (memaddr, info)
93 
     bfd_vma memaddr;
94 
     struct disassemble_info *info;
95 
{
96 
  unsigned char ibytes[4];
97 
  fprintf_ftype print_func = info->fprintf_func;
98 
  void *stream = info->stream;
99 
  unsigned short inst;
100 
  const mcore_opcode_info *op;
101 
  int status;
102 
 
103 
  info->bytes_per_chunk = 2;
104 
 
105 
  status = info->read_memory_func (memaddr, ibytes, 2, info);
106 
 
107 
  if (status != 0)
108 
    {
109 
      info->memory_error_func (status, memaddr, info);
110 
      return -1;
111 
    }
112 
 
113 
  if (info->endian == BFD_ENDIAN_BIG)
114 
    inst = (ibytes[0] << 8) | ibytes[1];
115 
  else if (info->endian == BFD_ENDIAN_LITTLE)
116 
    inst = (ibytes[1] << 8) | ibytes[0];
117 
  else
118 
    abort ();
119 
 
120 
  /* Just a linear search of the table.  */
121 
  for (op = mcore_table; op->name != 0; op++)
122 
    if (op->inst == (inst & imsk[op->opclass]))
123 
      break;
124 
 
125 
  if (op->name == 0)
126 
    (*print_func) (stream, ".short 0x%04x", inst);
127 
  else
128 
    {
129 
      const char *name = grname[inst & 0x0F];
130 
 
131 
      (*print_func) (stream, "%s", op->name);
132 
 
133 
      switch (op->opclass)
134 
        {
135 
        case O0:
136 
          break;
137 
 
138 
        case OT:
139 
          (*print_func) (stream, "\t%d", inst & 0x3);
140 
          break;
141 
 
142 
        case O1:
143 
        case JMP:
144 
        case JSR:
145 
          (*print_func) (stream, "\t%s", name);
146 
          break;
147 
 
148 
        case OC:
149 
          (*print_func) (stream, "\t%s, %s", name, crname[(inst >> 4) & 0x1F]);
150 
          break;
151 
 
152 
        case O1R1:
153 
          (*print_func) (stream, "\t%s, r1", name);
154 
          break;
155 
 
156 
        case MULSH:
157 
        case O2:
158 
          (*print_func) (stream, "\t%s, %s", name, grname[(inst >> 4) & 0xF]);
159 
          break;
160 
 
161 
        case X1:
162 
          (*print_func) (stream, "\tr1, %s", name);
163 
          break;
164 
 
165 
        case OI:
166 
          (*print_func) (stream, "\t%s, %d", name, ((inst >> 4) & 0x1F) + 1);
167 
          break;
168 
 
169 
        case RM:
170 
          (*print_func) (stream, "\t%s-r15, (r0)", name);
171 
          break;
172 
 
173 
        case RQ:
174 
          (*print_func) (stream, "\tr4-r7, (%s)", name);
175 
          break;
176 
 
177 
        case OB:
178 
        case OBRa:
179 
        case OBRb:
180 
        case OBRc:
181 
        case SI:
182 
        case SIa:
183 
        case OMa:
184 
        case OMb:
185 
        case OMc:
186 
          (*print_func) (stream, "\t%s, %d", name, (inst >> 4) & 0x1F);
187 
          break;
188 
 
189 
        case I7:
190 
          (*print_func) (stream, "\t%s, %d", name, (inst >> 4) & 0x7F);
191 
          break;
192 
 
193 
        case LS:
194 
          (*print_func) (stream, "\t%s, (%s, %d)", grname[(inst >> 8) & 0xF],
195 
                         name, ((inst >> 4) & 0xF) << isiz[(inst >> 13) & 3]);
196 
          break;
197 
 
198 
        case BR:
199 
          {
200 
            long val = inst & 0x3FF;
201 
 
202 
            if (inst & 0x400)
203 
              val |= 0xFFFFFC00;
204 
 
205 
            (*print_func) (stream, "\t0x%lx", (long)(memaddr + 2 + (val << 1)));
206 
 
207 
            if (strcmp (op->name, "bsr") == 0)
208 
              {
209 
                /* For bsr, we'll try to get a symbol for the target.  */
210 
                val = memaddr + 2 + (val << 1);
211 
 
212 
                if (info->print_address_func && val != 0)
213 
                  {
214 
                    (*print_func) (stream, "\t// ");
215 
                    info->print_address_func (val, info);
216 
                  }
217 
              }
218 
          }
219 
          break;
220 
 
221 
        case BL:
222 
          {
223 
            long val;
224 
            val = (inst & 0x000F);
225 
            (*print_func) (stream, "\t%s, 0x%lx",
226 
                           grname[(inst >> 4) & 0xF],
227 
                           (long) (memaddr - (val << 1)));
228 
          }
229 
          break;
230 
 
231 
        case LR:
232 
          {
233 
            unsigned long val;
234 
 
235 
            val = (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC;
236 
 
237 
            status = info->read_memory_func (val, ibytes, 4, info);
238 
            if (status != 0)
239 
              {
240 
                info->memory_error_func (status, memaddr, info);
241 
                break;
242 
              }
243 
 
244 
            if (info->endian == BFD_ENDIAN_LITTLE)
245 
              val = (ibytes[3] << 24) | (ibytes[2] << 16)
246 
                | (ibytes[1] << 8) | (ibytes[0]);
247 
            else
248 
              val = (ibytes[0] << 24) | (ibytes[1] << 16)
249 
                | (ibytes[2] << 8) | (ibytes[3]);
250 
 
251 
            /* Removed [] around literal value to match ABI syntax 12/95.  */
252 
            (*print_func) (stream, "\t%s, 0x%lX", grname[(inst >> 8) & 0xF], val);
253 
 
254 
            if (val == 0)
255 
              (*print_func) (stream, "\t// from address pool at 0x%lx",
256 
                             (long) (memaddr + 2
257 
                                     + ((inst & 0xFF) << 2)) & 0xFFFFFFFC);
258 
          }
259 
          break;
260 
 
261 
        case LJ:
262 
          {
263 
            unsigned long val;
264 
 
265 
            val = (memaddr + 2 + ((inst & 0xFF) << 2)) & 0xFFFFFFFC;
266 
 
267 
            status = info->read_memory_func (val, ibytes, 4, info);
268 
            if (status != 0)
269 
              {
270 
                info->memory_error_func (status, memaddr, info);
271 
                break;
272 
              }
273 
 
274 
            if (info->endian == BFD_ENDIAN_LITTLE)
275 
              val = (ibytes[3] << 24) | (ibytes[2] << 16)
276 
                | (ibytes[1] << 8) | (ibytes[0]);
277 
            else
278 
              val = (ibytes[0] << 24) | (ibytes[1] << 16)
279 
                | (ibytes[2] << 8) | (ibytes[3]);
280 
 
281 
            /* Removed [] around literal value to match ABI syntax 12/95.  */
282 
            (*print_func) (stream, "\t0x%lX", val);
283 
            /* For jmpi/jsri, we'll try to get a symbol for the target.  */
284 
            if (info->print_address_func && val != 0)
285 
              {
286 
                (*print_func) (stream, "\t// ");
287 
                info->print_address_func (val, info);
288 
              }
289 
            else
290 
              {
291 
                (*print_func) (stream, "\t// from address pool at 0x%lx",
292 
                               (long) (memaddr + 2
293 
                                       + ((inst & 0xFF) << 2)) & 0xFFFFFFFC);
294 
              }
295 
          }
296 
          break;
297 
 
298 
        case OPSR:
299 
          {
300 
            static char *fields[] = {
301 
              "af", "ie",    "fe",    "fe,ie",
302 
              "ee", "ee,ie", "ee,fe", "ee,fe,ie"
303 
            };
304 
 
305 
            (*print_func) (stream, "\t%s", fields[inst & 0x7]);
306 
          }
307 
          break;
308 
 
309 
        default:
310 
          /* If the disassembler lags the instruction set.  */
311 
          (*print_func) (stream, "\tundecoded operands, inst is 0x%04x", inst);
312 
          break;
313 
        }
314 
    }
315 
 
316 
  /* Say how many bytes we consumed.  */
317 
  return 2;
318 
}

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