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[/] [or1k/] [trunk/] [gdb-5.3/] [opcodes/] [pdp11-dis.c] - Blame information for rev 1777

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1 1181 sfurman 
/* Print DEC PDP-11 instructions.
2 
   Copyright 2001, 2002 Free Software Foundation, Inc.
3 
 
4 
This file 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 "sysdep.h"
19 
#include "dis-asm.h"
20 
#include "opcode/pdp11.h"
21 
 
22 
#define AFTER_INSTRUCTION       "\t"
23 
#define OPERAND_SEPARATOR       ", "
24 
 
25 
#define JUMP    0x1000  /* flag that this operand is used in a jump */
26 
 
27 
#define FPRINTF (*info->fprintf_func)
28 
#define F       info->stream
29 
 
30 
/* sign-extend a 16-bit number in an int */
31 
#define SIGN_BITS       (8 * sizeof (int) - 16)
32 
#define sign_extend(x) (((x) << SIGN_BITS) >> SIGN_BITS)
33 
 
34 
static int read_word PARAMS ((bfd_vma memaddr, int *word,
35 
                              disassemble_info *info));
36 
static void print_signed_octal PARAMS ((int n, disassemble_info *info));
37 
static void print_reg PARAMS ((int reg, disassemble_info *info));
38 
static void print_freg PARAMS ((int freg, disassemble_info *info));
39 
static int print_operand PARAMS ((bfd_vma *memaddr, int code,
40 
                                  disassemble_info *info));
41 
static int print_foperand PARAMS ((bfd_vma *memaddr, int code,
42 
                                   disassemble_info *info));
43 
int print_insn_pdp11 PARAMS ((bfd_vma memaddr, disassemble_info *info));
44 
 
45 
static int
46 
read_word (memaddr, word, info)
47 
     bfd_vma memaddr;
48 
     int *word;
49 
     disassemble_info *info;
50 
{
51 
  int status;
52 
  bfd_byte x[2];
53 
 
54 
  status = (*info->read_memory_func) (memaddr, x, 2, info);
55 
  if (status != 0)
56 
    return -1;
57 
 
58 
  *word = x[1] << 8 | x[0];
59 
  return 0;
60 
}
61 
 
62 
static void
63 
print_signed_octal (n, info)
64 
     int n;
65 
     disassemble_info *info;
66 
{
67 
  if (n < 0)
68 
    FPRINTF (F, "-%o", -n);
69 
  else
70 
    FPRINTF (F, "%o", n);
71 
}
72 
 
73 
static void
74 
print_reg (reg, info)
75 
     int reg;
76 
     disassemble_info *info;
77 
{
78 
  /* mask off the addressing mode, if any */
79 
  reg &= 7;
80 
 
81 
  switch (reg)
82 
    {
83 
    case 0: case 1: case 2: case 3: case 4: case 5:
84 
                FPRINTF (F, "r%d", reg); break;
85 
    case 6:     FPRINTF (F, "sp"); break;
86 
    case 7:     FPRINTF (F, "pc"); break;
87 
    default:    /* error */
88 
    }
89 
}
90 
 
91 
static void
92 
print_freg (freg, info)
93 
     int freg;
94 
     disassemble_info *info;
95 
{
96 
  FPRINTF (F, "fr%d", freg);
97 
}
98 
 
99 
static int
100 
print_operand (memaddr, code, info)
101 
     bfd_vma *memaddr;
102 
     int code;
103 
     disassemble_info *info;
104 
{
105 
  int mode = (code >> 3) & 7;
106 
  int reg = code & 7;
107 
  int disp;
108 
 
109 
  switch (mode)
110 
    {
111 
    case 0:
112 
      print_reg (reg, info);
113 
      break;
114 
    case 1:
115 
      FPRINTF (F, "(");
116 
      print_reg (reg, info);
117 
      FPRINTF (F, ")");
118 
      break;
119 
    case 2:
120 
      if (reg == 7)
121 
        {
122 
          int data;
123 
          if (read_word (*memaddr, &data, info) < 0)
124 
            return -1;
125 
          FPRINTF (F, "$");
126 
          print_signed_octal (sign_extend (data), info);
127 
          *memaddr += 2;
128 
        }
129 
      else
130 
        {
131 
          FPRINTF (F, "(");
132 
          print_reg (reg, info);
133 
          FPRINTF (F, ")+");
134 
        }
135 
        break;
136 
    case 3:
137 
      if (reg == 7)
138 
        {
139 
          int address;
140 
          if (read_word (*memaddr, &address, info) < 0)
141 
            return -1;
142 
          FPRINTF (F, "*$%o", address);
143 
          *memaddr += 2;
144 
        }
145 
      else
146 
        {
147 
          FPRINTF (F, "*(");
148 
          print_reg (reg, info);
149 
          FPRINTF (F, ")+");
150 
        }
151 
        break;
152 
    case 4:
153 
      FPRINTF (F, "-(");
154 
      print_reg (reg, info);
155 
      FPRINTF (F, ")");
156 
      break;
157 
    case 5:
158 
      FPRINTF (F, "*-(");
159 
      print_reg (reg, info);
160 
      FPRINTF (F, ")");
161 
      break;
162 
    case 6:
163 
    case 7:
164 
      if (read_word (*memaddr, &disp, info) < 0)
165 
        return -1;
166 
      *memaddr += 2;
167 
      if (reg == 7)
168 
        {
169 
          bfd_vma address = *memaddr + sign_extend (disp);
170 
          if (mode == 7)
171 
            FPRINTF (F, "*");
172 
          if (!(code & JUMP))
173 
            FPRINTF (F, "$");
174 
          (*info->print_address_func) (address, info);
175 
        }
176 
      else
177 
        {
178 
          if (mode == 7)
179 
            FPRINTF (F, "*");
180 
          print_signed_octal (sign_extend (disp), info);
181 
          FPRINTF (F, "(");
182 
          print_reg (reg, info);
183 
          FPRINTF (F, ")");
184 
        }
185 
      break;
186 
    }
187 
 
188 
  return 0;
189 
}
190 
 
191 
static int
192 
print_foperand (memaddr, code, info)
193 
     bfd_vma *memaddr;
194 
     int code;
195 
     disassemble_info *info;
196 
{
197 
  int mode = (code >> 3) & 7;
198 
  int reg = code & 7;
199 
 
200 
  if (mode == 0)
201 
    print_freg (reg, info);
202 
  else
203 
    return print_operand (memaddr, code, info);
204 
 
205 
  return 0;
206 
}
207 
 
208 
/* Print the PDP-11 instruction at address MEMADDR in debugged memory,
209 
   on INFO->STREAM.  Returns length of the instruction, in bytes.  */
210 
 
211 
int
212 
print_insn_pdp11 (memaddr, info)
213 
     bfd_vma memaddr;
214 
     disassemble_info *info;
215 
{
216 
  bfd_vma start_memaddr = memaddr;
217 
  int opcode;
218 
  int src, dst;
219 
  int i;
220 
 
221 
  info->bytes_per_line = 6;
222 
  info->bytes_per_chunk = 2;
223 
  info->display_endian = BFD_ENDIAN_LITTLE;
224 
 
225 
  if (read_word (memaddr, &opcode, info) != 0)
226 
    return -1;
227 
  memaddr += 2;
228 
 
229 
  src = (opcode >> 6) & 0x3f;
230 
  dst = opcode & 0x3f;
231 
 
232 
  for (i = 0; i < pdp11_num_opcodes; i++)
233 
    {
234 
#define OP pdp11_opcodes[i]
235 
      if ((opcode & OP.mask) == OP.opcode)
236 
        switch (OP.type)
237 
          {
238 
          case PDP11_OPCODE_NO_OPS:
239 
            FPRINTF (F, OP.name);
240 
            goto done;
241 
          case PDP11_OPCODE_REG:
242 
            FPRINTF (F, OP.name);
243 
            FPRINTF (F, AFTER_INSTRUCTION);
244 
            print_reg (dst, info);
245 
            goto done;
246 
          case PDP11_OPCODE_OP:
247 
            FPRINTF (F, OP.name);
248 
            FPRINTF (F, AFTER_INSTRUCTION);
249 
            if (strcmp (OP.name, "jmp") == 0)
250 
              dst |= JUMP;
251 
            if (print_operand (&memaddr, dst, info) < 0)
252 
              return -1;
253 
            goto done;
254 
          case PDP11_OPCODE_FOP:
255 
            FPRINTF (F, OP.name);
256 
            FPRINTF (F, AFTER_INSTRUCTION);
257 
            if (strcmp (OP.name, "jmp") == 0)
258 
              dst |= JUMP;
259 
            if (print_foperand (&memaddr, dst, info) < 0)
260 
              return -1;
261 
            goto done;
262 
          case PDP11_OPCODE_REG_OP:
263 
            FPRINTF (F, OP.name);
264 
            FPRINTF (F, AFTER_INSTRUCTION);
265 
            print_reg (src, info);
266 
            FPRINTF (F, OPERAND_SEPARATOR);
267 
            if (strcmp (OP.name, "jsr") == 0)
268 
              dst |= JUMP;
269 
            if (print_operand (&memaddr, dst, info) < 0)
270 
              return -1;
271 
            goto done;
272 
          case PDP11_OPCODE_REG_OP_REV:
273 
            FPRINTF (F, OP.name);
274 
            FPRINTF (F, AFTER_INSTRUCTION);
275 
            if (print_operand (&memaddr, dst, info) < 0)
276 
              return -1;
277 
            FPRINTF (F, OPERAND_SEPARATOR);
278 
            print_reg (src, info);
279 
            goto done;
280 
          case PDP11_OPCODE_AC_FOP:
281 
            {
282 
              int ac = (opcode & 0xe0) >> 6;
283 
              FPRINTF (F, OP.name);
284 
              FPRINTF (F, AFTER_INSTRUCTION);
285 
              print_freg (ac, info);
286 
              FPRINTF (F, OPERAND_SEPARATOR);
287 
              if (print_foperand (&memaddr, dst, info) < 0)
288 
                return -1;
289 
              goto done;
290 
            }
291 
          case PDP11_OPCODE_FOP_AC:
292 
            {
293 
              int ac = (opcode & 0xe0) >> 6;
294 
              FPRINTF (F, OP.name);
295 
              FPRINTF (F, AFTER_INSTRUCTION);
296 
              if (print_foperand (&memaddr, dst, info) < 0)
297 
                return -1;
298 
              FPRINTF (F, OPERAND_SEPARATOR);
299 
              print_freg (ac, info);
300 
              goto done;
301 
            }
302 
          case PDP11_OPCODE_AC_OP:
303 
            {
304 
              int ac = (opcode & 0xe0) >> 6;
305 
              FPRINTF (F, OP.name);
306 
              FPRINTF (F, AFTER_INSTRUCTION);
307 
              print_freg (ac, info);
308 
              FPRINTF (F, OPERAND_SEPARATOR);
309 
              if (print_operand (&memaddr, dst, info) < 0)
310 
                return -1;
311 
              goto done;
312 
            }
313 
          case PDP11_OPCODE_OP_AC:
314 
            {
315 
              int ac = (opcode & 0xe0) >> 6;
316 
              FPRINTF (F, OP.name);
317 
              FPRINTF (F, AFTER_INSTRUCTION);
318 
              if (print_operand (&memaddr, dst, info) < 0)
319 
                return -1;
320 
              FPRINTF (F, OPERAND_SEPARATOR);
321 
              print_freg (ac, info);
322 
              goto done;
323 
            }
324 
          case PDP11_OPCODE_OP_OP:
325 
            FPRINTF (F, OP.name);
326 
            FPRINTF (F, AFTER_INSTRUCTION);
327 
            if (print_operand (&memaddr, src, info) < 0)
328 
              return -1;
329 
            FPRINTF (F, OPERAND_SEPARATOR);
330 
            if (print_operand (&memaddr, dst, info) < 0)
331 
              return -1;
332 
            goto done;
333 
          case PDP11_OPCODE_DISPL:
334 
            {
335 
              int displ = (opcode & 0xff) << 8;
336 
              bfd_vma address = memaddr + (sign_extend (displ) >> 7);
337 
              FPRINTF (F, OP.name);
338 
              FPRINTF (F, AFTER_INSTRUCTION);
339 
              (*info->print_address_func) (address, info);
340 
              goto done;
341 
            }
342 
          case PDP11_OPCODE_REG_DISPL:
343 
            {
344 
              int displ = (opcode & 0x3f) << 10;
345 
              bfd_vma address = memaddr + (sign_extend (displ) >> 9);
346 
              FPRINTF (F, OP.name);
347 
              FPRINTF (F, AFTER_INSTRUCTION);
348 
              print_reg (src, info);
349 
              FPRINTF (F, OPERAND_SEPARATOR);
350 
              (*info->print_address_func) (address, info);
351 
              goto done;
352 
            }
353 
          case PDP11_OPCODE_IMM8:
354 
            {
355 
              int code = opcode & 0xff;
356 
              FPRINTF (F, OP.name);
357 
              FPRINTF (F, AFTER_INSTRUCTION);
358 
              FPRINTF (F, "%o", code);
359 
              goto done;
360 
            }
361 
          case PDP11_OPCODE_IMM6:
362 
            {
363 
              int code = opcode & 0x3f;
364 
              FPRINTF (F, OP.name);
365 
              FPRINTF (F, AFTER_INSTRUCTION);
366 
              FPRINTF (F, "%o", code);
367 
              goto done;
368 
            }
369 
          case PDP11_OPCODE_IMM3:
370 
            {
371 
              int code = opcode & 7;
372 
              FPRINTF (F, OP.name);
373 
              FPRINTF (F, AFTER_INSTRUCTION);
374 
              FPRINTF (F, "%o", code);
375 
              goto done;
376 
            }
377 
          case PDP11_OPCODE_ILLEGAL:
378 
            {
379 
              FPRINTF (F, ".word");
380 
              FPRINTF (F, AFTER_INSTRUCTION);
381 
              FPRINTF (F, "%o", opcode);
382 
              goto done;
383 
            }
384 
          default:
385 
            /* TODO: is this a proper way of signalling an error? */
386 
            FPRINTF (F, "<internal error: unrecognized instruction type>");
387 
            return -1;
388 
          }
389 
#undef OP
390 
    }
391 
 done:
392 
 
393 
  return memaddr - start_memaddr;
394 
}

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