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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-6.8/] [sim/] [m32c/] [reg.c] - Blame information for rev 816

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1 24 jeremybenn 
/* reg.c --- register set model for M32C simulator.
2 
 
3 
Copyright (C) 2005, 2007, 2008 Free Software Foundation, Inc.
4 
Contributed by Red Hat, Inc.
5 
 
6 
This file is part of the GNU simulators.
7 
 
8 
This program is free software; you can redistribute it and/or modify
9 
it under the terms of the GNU General Public License as published by
10 
the Free Software Foundation; either version 3 of the License, or
11 
(at your option) any later version.
12 
 
13 
This program is distributed in the hope that it will be useful,
14 
but WITHOUT ANY WARRANTY; without even the implied warranty of
15 
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 
GNU General Public License for more details.
17 
 
18 
You should have received a copy of the GNU General Public License
19 
along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
20 
 
21 
 
22 
#include <stdio.h>
23 
#include <stdlib.h>
24 
#include <string.h>
25 
 
26 
#include "cpu.h"
27 
 
28 
int verbose = 0;
29 
int trace = 0;
30 
int enable_counting = 0;
31 
 
32 
regs_type regs;
33 
int addr_mask = 0xffff;
34 
int membus_mask = 0xfffff;
35 
int m32c_cpu = 0;
36 
int step_result;
37 
unsigned int heapbottom = 0;
38 
unsigned int heaptop = 0;
39 
 
40 
char *reg_names[] = {
41 
  "mem",
42 
  "r0", "r0h", "r0l",
43 
  "r1", "r1h", "r1l",
44 
  "r2", "r2r0",
45 
  "r3", "r3r1",
46 
  "r3r1r2r0",
47 
  "r3r2r1r0",
48 
  "a0",
49 
  "a1", "a1a0",
50 
  "sb", "fb",
51 
  "intb", "intbl", "intbh",
52 
  "sp", "usp", "isp", "pc", "flags"
53 
};
54 
 
55 
int reg_bytes[] = {
56 
  0,
57 
  2, 1, 1,
58 
  2, 1, 1,
59 
  2, 4,
60 
  2, 4,
61 
  8,
62 
  8,
63 
  2,
64 
  2, 4,
65 
  2, 2,
66 
  2, 1, 3,
67 
  2, 2, 2, 3, 2
68 
};
69 
 
70 
 
71 
unsigned int b2mask[] = { 0, 0xff, 0xffff, 0xffffff, 0xffffffff };
72 
unsigned int b2signbit[] = { 0, (1 << 7), (1 << 15), (1 << 24), (1 << 31) };
73 
int b2maxsigned[] = { 0, 0x7f, 0x7fff, 0x7fffff, 0x7fffffff };
74 
int b2minsigned[] = { 0, -128, -32768, -8388608, -2147483647 - 1 };
75 
 
76 
static regs_type oldregs;
77 
 
78 
void
79 
init_regs (void)
80 
{
81 
  memset (&regs, 0, sizeof (regs));
82 
  memset (&oldregs, 0, sizeof (oldregs));
83 
}
84 
 
85 
void
86 
set_pointer_width (int bytes)
87 
{
88 
  if (bytes == 2)
89 
    {
90 
      addr_mask = 0xffff;
91 
      membus_mask = 0x000fffff;
92 
      reg_bytes[a0] = reg_bytes[a1] = reg_bytes[sb] = reg_bytes[fb] =
93 
        reg_bytes[sp] = reg_bytes[usp] = reg_bytes[isp] = 2;
94 
    }
95 
  else
96 
    {
97 
      addr_mask = 0xffffff;
98 
      membus_mask = 0x00ffffff;
99 
      reg_bytes[a0] = reg_bytes[a1] = reg_bytes[sb] = reg_bytes[fb] =
100 
        reg_bytes[sp] = reg_bytes[usp] = reg_bytes[isp] = 3;
101 
    }
102 
}
103 
 
104 
void
105 
m32c_set_cpu (int cpu)
106 
{
107 
  switch (cpu)
108 
    {
109 
    case CPU_R8C:
110 
    case CPU_M16C:
111 
      set_pointer_width (2);
112 
      decode_opcode = decode_r8c;
113 
      break;
114 
    case CPU_M32CM:
115 
    case CPU_M32C:
116 
      set_pointer_width (3);
117 
      decode_opcode = decode_m32c;
118 
      break;
119 
    default:
120 
      abort ();
121 
    }
122 
  m32c_cpu = cpu;
123 
}
124 
 
125 
static unsigned int
126 
get_reg_i (reg_id id)
127 
{
128 
  reg_bank_type *b = regs.r + (FLAG_B ? 1 : 0);
129 
 
130 
  switch (id)
131 
    {
132 
    case r0:
133 
      return b->r_r0;
134 
    case r0h:
135 
      return b->r_r0 >> 8;
136 
    case r0l:
137 
      return b->r_r0 & 0xff;
138 
    case r1:
139 
      return b->r_r1;
140 
    case r1h:
141 
      return b->r_r1 >> 8;
142 
    case r1l:
143 
      return b->r_r1 & 0xff;
144 
    case r2:
145 
      return b->r_r2;
146 
    case r2r0:
147 
      return b->r_r2 * 65536 + b->r_r0;
148 
    case r3:
149 
      return b->r_r3;
150 
    case r3r1:
151 
      return b->r_r3 * 65536 + b->r_r1;
152 
 
153 
    case a0:
154 
      return b->r_a0 & addr_mask;
155 
    case a1:
156 
      return b->r_a1 & addr_mask;
157 
    case a1a0:
158 
      return (b->r_a1 & 0xffff) * 65536 | (b->r_a0 & 0xffff);
159 
 
160 
    case sb:
161 
      return b->r_sb & addr_mask;
162 
    case fb:
163 
      return b->r_fb & addr_mask;
164 
 
165 
    case intb:
166 
      return regs.r_intbh * 65536 + regs.r_intbl;
167 
    case intbl:
168 
      return regs.r_intbl;
169 
    case intbh:
170 
      return regs.r_intbh;
171 
 
172 
    case sp:
173 
      return ((regs.r_flags & FLAGBIT_U) ? regs.r_usp : regs.
174 
              r_isp) & addr_mask;
175 
    case usp:
176 
      return regs.r_usp & addr_mask;
177 
    case isp:
178 
      return regs.r_isp & addr_mask;
179 
 
180 
    case pc:
181 
      return regs.r_pc & membus_mask;
182 
    case flags:
183 
      return regs.r_flags;
184 
    default:
185 
      abort ();
186 
    }
187 
}
188 
 
189 
unsigned int
190 
get_reg (reg_id id)
191 
{
192 
  unsigned int rv = get_reg_i (id);
193 
  if (trace > ((id != pc && id != fb && id != sp) ? 0 : 1))
194 
    printf ("get_reg (%s) = %0*x\n", reg_names[id], reg_bytes[id] * 2, rv);
195 
  return rv;
196 
}
197 
 
198 
DI
199 
get_reg_ll (reg_id id)
200 
{
201 
  reg_bank_type *b = regs.r + (FLAG_B ? 1 : 0);
202 
 
203 
  switch (id)
204 
    {
205 
    case r3r1r2r0:
206 
      return ((DI) b->r_r3 << 48
207 
              | (DI) b->r_r1 << 32 | (DI) b->r_r2 << 16 | (DI) b->r_r0);
208 
    case r3r2r1r0:
209 
      return ((DI) b->r_r3 << 48
210 
              | (DI) b->r_r2 << 32 | (DI) b->r_r1 << 16 | (DI) b->r_r0);
211 
    default:
212 
      return get_reg (id);
213 
    }
214 
}
215 
 
216 
static int highest_sp = 0, lowest_sp = 0xffffff;
217 
 
218 
void
219 
stack_heap_stats ()
220 
{
221 
  printf ("heap:  %08x - %08x (%d bytes)\n", heapbottom, heaptop,
222 
          heaptop - heapbottom);
223 
  printf ("stack: %08x - %08x (%d bytes)\n", lowest_sp, highest_sp,
224 
          highest_sp - lowest_sp);
225 
}
226 
 
227 
void
228 
put_reg (reg_id id, unsigned int v)
229 
{
230 
  if (trace > ((id != pc) ? 0 : 1))
231 
    printf ("put_reg (%s) = %0*x\n", reg_names[id], reg_bytes[id] * 2, v);
232 
 
233 
  reg_bank_type *b = regs.r + (FLAG_B ? 1 : 0);
234 
  switch (id)
235 
    {
236 
    case r0:
237 
      b->r_r0 = v;
238 
      break;
239 
    case r0h:
240 
      b->r_r0 = (b->r_r0 & 0xff) | (v << 8);
241 
      break;
242 
    case r0l:
243 
      b->r_r0 = (b->r_r0 & 0xff00) | (v & 0xff);
244 
      break;
245 
    case r1:
246 
      b->r_r1 = v;
247 
      break;
248 
    case r1h:
249 
      b->r_r1 = (b->r_r1 & 0xff) | (v << 8);
250 
      break;
251 
    case r1l:
252 
      b->r_r1 = (b->r_r1 & 0xff00) | (v & 0xff);
253 
      break;
254 
    case r2:
255 
      b->r_r2 = v;
256 
      break;
257 
    case r2r0:
258 
      b->r_r0 = v & 0xffff;
259 
      b->r_r2 = v >> 16;
260 
      break;
261 
    case r3:
262 
      b->r_r3 = v;
263 
      break;
264 
    case r3r1:
265 
      b->r_r1 = v & 0xffff;
266 
      b->r_r3 = v >> 16;
267 
      break;
268 
 
269 
    case a0:
270 
      b->r_a0 = v & addr_mask;
271 
      break;
272 
    case a1:
273 
      b->r_a1 = v & addr_mask;
274 
      break;
275 
    case a1a0:
276 
      b->r_a0 = v & 0xffff;
277 
      b->r_a1 = v >> 16;
278 
      break;
279 
 
280 
    case sb:
281 
      b->r_sb = v & addr_mask;
282 
      break;
283 
    case fb:
284 
      b->r_fb = v & addr_mask;
285 
      break;
286 
 
287 
    case intb:
288 
      regs.r_intbl = v & 0xffff;
289 
      regs.r_intbh = v >> 16;
290 
      break;
291 
    case intbl:
292 
      regs.r_intbl = v & 0xffff;
293 
      break;
294 
    case intbh:
295 
      regs.r_intbh = v & 0xff;
296 
      break;
297 
 
298 
    case sp:
299 
      {
300 
        SI *spp;
301 
        if (regs.r_flags & FLAGBIT_U)
302 
          spp = &regs.r_usp;
303 
        else
304 
          spp = &regs.r_isp;
305 
        *spp = v & addr_mask;
306 
        if (*spp < heaptop)
307 
          {
308 
            printf ("collision: pc %08lx heap %08x stack %08lx\n", regs.r_pc,
309 
                    heaptop, *spp);
310 
            exit (1);
311 
          }
312 
        if (*spp < lowest_sp)
313 
          lowest_sp = *spp;
314 
        if (*spp > highest_sp)
315 
          highest_sp = *spp;
316 
        break;
317 
      }
318 
    case usp:
319 
      regs.r_usp = v & addr_mask;
320 
      break;
321 
    case isp:
322 
      regs.r_isp = v & addr_mask;
323 
      break;
324 
 
325 
    case pc:
326 
      regs.r_pc = v & membus_mask;
327 
      break;
328 
    case flags:
329 
      regs.r_flags = v;
330 
      break;
331 
    default:
332 
      abort ();
333 
    }
334 
}
335 
 
336 
int
337 
condition_true (int cond_id)
338 
{
339 
  int f;
340 
  if (A16)
341 
    {
342 
      static const char *cond_name[] = {
343 
        "C", "C&!Z", "Z", "S",
344 
        "!C", "!(C&!Z)", "!Z", "!S",
345 
        "(S^O)|Z", "O", "!(S^O)", "unk",
346 
        "!((S^O)|Z)", "!O", "S^O", "unk"
347 
      };
348 
      switch (cond_id & 15)
349 
        {
350 
        case 0:
351 
          f = FLAG_C;
352 
          break;                /* GEU/C */
353 
        case 1:
354 
          f = FLAG_C & !FLAG_Z;
355 
          break;                /* GTU */
356 
        case 2:
357 
          f = FLAG_Z;
358 
          break;                /* EQ/Z */
359 
        case 3:
360 
          f = FLAG_S;
361 
          break;                /* N */
362 
        case 4:
363 
          f = !FLAG_C;
364 
          break;                /* LTU/NC */
365 
        case 5:
366 
          f = !(FLAG_C & !FLAG_Z);
367 
          break;                /* LEU */
368 
        case 6:
369 
          f = !FLAG_Z;
370 
          break;                /* NE/NZ */
371 
        case 7:
372 
          f = !FLAG_S;
373 
          break;                /* PZ */
374 
 
375 
        case 8:
376 
          f = (FLAG_S ^ FLAG_O) | FLAG_Z;
377 
          break;                /* LE */
378 
        case 9:
379 
          f = FLAG_O;
380 
          break;                /* O */
381 
        case 10:
382 
          f = !(FLAG_S ^ FLAG_O);
383 
          break;                /* GE */
384 
        case 12:
385 
          f = !((FLAG_S ^ FLAG_O) | FLAG_Z);
386 
          break;                /* GT */
387 
        case 13:
388 
          f = !FLAG_O;
389 
          break;                /* NO */
390 
        case 14:
391 
          f = FLAG_S ^ FLAG_O;
392 
          break;                /* LT */
393 
 
394 
        default:
395 
          f = 0;
396 
          break;
397 
        }
398 
      if (trace)
399 
        printf ("cond[%d] %s = %s\n", cond_id, cond_name[cond_id & 15],
400 
                f ? "true" : "false");
401 
    }
402 
  else
403 
    {
404 
      static const char *cond_name[] = {
405 
        "!C", "LEU", "!Z", "PZ",
406 
        "!O", "GT", "GE", "?",
407 
        "C", "GTU", "Z", "N",
408 
        "O", "LE", "LT", "!?"
409 
      };
410 
      switch (cond_id & 15)
411 
        {
412 
        case 0:
413 
          f = !FLAG_C;
414 
          break;                /* LTU/NC */
415 
        case 1:
416 
          f = !(FLAG_C & !FLAG_Z);
417 
          break;                /* LEU */
418 
        case 2:
419 
          f = !FLAG_Z;
420 
          break;                /* NE/NZ */
421 
        case 3:
422 
          f = !FLAG_S;
423 
          break;                /* PZ */
424 
 
425 
        case 4:
426 
          f = !FLAG_O;
427 
          break;                /* NO */
428 
        case 5:
429 
          f = !((FLAG_S ^ FLAG_O) | FLAG_Z);
430 
          break;                /* GT */
431 
        case 6:
432 
          f = !(FLAG_S ^ FLAG_O);
433 
          break;                /* GE */
434 
 
435 
        case 8:
436 
          f = FLAG_C;
437 
          break;                /* GEU/C */
438 
        case 9:
439 
          f = FLAG_C & !FLAG_Z;
440 
          break;                /* GTU */
441 
        case 10:
442 
          f = FLAG_Z;
443 
          break;                /* EQ/Z */
444 
        case 11:
445 
          f = FLAG_S;
446 
          break;                /* N */
447 
 
448 
        case 12:
449 
          f = FLAG_O;
450 
          break;                /* O */
451 
        case 13:
452 
          f = (FLAG_S ^ FLAG_O) | FLAG_Z;
453 
          break;                /* LE */
454 
        case 14:
455 
          f = FLAG_S ^ FLAG_O;
456 
          break;                /* LT */
457 
 
458 
        default:
459 
          f = 0;
460 
          break;
461 
        }
462 
      if (trace)
463 
        printf ("cond[%d] %s = %s\n", cond_id, cond_name[cond_id & 15],
464 
                f ? "true" : "false");
465 
    }
466 
  return f;
467 
}
468 
 
469 
void
470 
set_flags (int mask, int newbits)
471 
{
472 
  int i;
473 
  regs.r_flags &= ~mask;
474 
  regs.r_flags |= newbits & mask;
475 
  if (trace)
476 
    {
477 
      printf ("flags now \033[32m %d", (regs.r_flags >> (A16 ? 8 : 12)) & 7);
478 
      for (i = 7; i >= 0; i--)
479 
        if (regs.r_flags & (1 << i))
480 
          putchar ("CDZSBOIU"[i]);
481 
        else
482 
          putchar ('-');
483 
      printf ("\033[0m\n");
484 
    }
485 
}
486 
 
487 
void
488 
set_oszc (int value, int b, int c)
489 
{
490 
  int mask = b2mask[b];
491 
  int f = 0;
492 
 
493 
  if (c)
494 
    f |= FLAGBIT_C;
495 
  if ((value & mask) == 0)
496 
    f |= FLAGBIT_Z;
497 
  if (value & b2signbit[b])
498 
    f |= FLAGBIT_S;
499 
  if ((value > b2maxsigned[b]) || (value < b2minsigned[b]))
500 
    f |= FLAGBIT_O;
501 
  set_flags (FLAGBIT_Z | FLAGBIT_S | FLAGBIT_O | FLAGBIT_C, f);
502 
}
503 
 
504 
void
505 
set_szc (int value, int b, int c)
506 
{
507 
  int mask = b2mask[b];
508 
  int f = 0;
509 
 
510 
  if (c)
511 
    f |= FLAGBIT_C;
512 
  if ((value & mask) == 0)
513 
    f |= FLAGBIT_Z;
514 
  if (value & b2signbit[b])
515 
    f |= FLAGBIT_S;
516 
  set_flags (FLAGBIT_Z | FLAGBIT_S | FLAGBIT_C, f);
517 
}
518 
 
519 
void
520 
set_osz (int value, int b)
521 
{
522 
  int mask = b2mask[b];
523 
  int f = 0;
524 
 
525 
  if ((value & mask) == 0)
526 
    f |= FLAGBIT_Z;
527 
  if (value & b2signbit[b])
528 
    f |= FLAGBIT_S;
529 
  if (value & ~mask && (value & ~mask) != ~mask)
530 
    f |= FLAGBIT_O;
531 
  set_flags (FLAGBIT_Z | FLAGBIT_S | FLAGBIT_O, f);
532 
}
533 
 
534 
void
535 
set_sz (int value, int b)
536 
{
537 
  int mask = b2mask[b];
538 
  int f = 0;
539 
 
540 
  if ((value & mask) == 0)
541 
    f |= FLAGBIT_Z;
542 
  if (value & b2signbit[b])
543 
    f |= FLAGBIT_S;
544 
  set_flags (FLAGBIT_Z | FLAGBIT_S, f);
545 
}
546 
 
547 
void
548 
set_zc (int z, int c)
549 
{
550 
  set_flags (FLAGBIT_C | FLAGBIT_Z,
551 
             (c ? FLAGBIT_C : 0) | (z ? FLAGBIT_Z : 0));
552 
}
553 
 
554 
void
555 
set_c (int c)
556 
{
557 
  set_flags (FLAGBIT_C, c ? FLAGBIT_C : 0);
558 
}
559 
 
560 
void
561 
put_reg_ll (reg_id id, DI v)
562 
{
563 
  reg_bank_type *b = regs.r + (FLAG_B ? 1 : 0);
564 
 
565 
  switch (id)
566 
    {
567 
    case r3r1r2r0:
568 
      b->r_r3 = v >> 48;
569 
      b->r_r1 = v >> 32;
570 
      b->r_r2 = v >> 16;
571 
      b->r_r0 = v;
572 
      break;
573 
    case r3r2r1r0:
574 
      b->r_r3 = v >> 48;
575 
      b->r_r2 = v >> 32;
576 
      b->r_r1 = v >> 16;
577 
      b->r_r0 = v;
578 
      break;
579 
    default:
580 
      put_reg (id, v);
581 
    }
582 
}
583 
 
584 
#define TRC(f,n, id) \
585 
  if (oldregs.f != regs.f) \
586 
    { \
587 
      printf("  %s %0*x:%0*x", n, \
588 
             reg_bytes[id]*2, (unsigned int)oldregs.f, \
589 
             reg_bytes[id]*2, (unsigned int)regs.f); \
590 
      oldregs.f = regs.f; \
591 
    }
592 
 
593 
void
594 
trace_register_changes ()
595 
{
596 
  if (!trace)
597 
    return;
598 
  printf ("\033[36mREGS:");
599 
  TRC (r[0].r_r0, "r0", r0);
600 
  TRC (r[0].r_r1, "r1", r1);
601 
  TRC (r[0].r_r2, "r2", r2);
602 
  TRC (r[0].r_r3, "r3", r3);
603 
  TRC (r[0].r_a0, "a0", a0);
604 
  TRC (r[0].r_a1, "a1", a1);
605 
  TRC (r[0].r_sb, "sb", sb);
606 
  TRC (r[0].r_fb, "fb", fb);
607 
  TRC (r[1].r_r0, "r0'", r0);
608 
  TRC (r[1].r_r1, "r1'", r1);
609 
  TRC (r[1].r_r2, "r2'", r2);
610 
  TRC (r[1].r_r3, "r3'", r3);
611 
  TRC (r[1].r_a0, "a0'", a0);
612 
  TRC (r[1].r_a1, "a1'", a1);
613 
  TRC (r[1].r_sb, "sb'", sb);
614 
  TRC (r[1].r_fb, "fb'", fb);
615 
  TRC (r_intbh, "intbh", intbh);
616 
  TRC (r_intbl, "intbl", intbl);
617 
  TRC (r_usp, "usp", usp);
618 
  TRC (r_isp, "isp", isp);
619 
  TRC (r_pc, "pc", pc);
620 
  TRC (r_flags, "flags", flags);
621 
  printf ("\033[0m\n");
622 
}

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