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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.1/] [sim/] [m32c/] [reg.c] - Blame information for rev 252

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1 227 jeremybenn 
/* reg.c --- register set model for M32C simulator.
2 
 
3 
Copyright (C) 2005, 2007, 2008, 2009, 2010 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 
int in_gdb = 1;
32 
 
33 
regs_type regs;
34 
int addr_mask = 0xffff;
35 
int membus_mask = 0xfffff;
36 
int m32c_cpu = 0;
37 
int step_result;
38 
unsigned int heapbottom = 0;
39 
unsigned int heaptop = 0;
40 
 
41 
char *reg_names[] = {
42 
  "mem",
43 
  "r0", "r0h", "r0l",
44 
  "r1", "r1h", "r1l",
45 
  "r2", "r2r0",
46 
  "r3", "r3r1",
47 
  "r3r1r2r0",
48 
  "r3r2r1r0",
49 
  "a0",
50 
  "a1", "a1a0",
51 
  "sb", "fb",
52 
  "intb", "intbl", "intbh",
53 
  "sp", "usp", "isp", "pc", "flags"
54 
};
55 
 
56 
int reg_bytes[] = {
57 
  0,
58 
  2, 1, 1,
59 
  2, 1, 1,
60 
  2, 4,
61 
  2, 4,
62 
  8,
63 
  8,
64 
  2,
65 
  2, 4,
66 
  2, 2,
67 
  2, 1, 3,
68 
  2, 2, 2, 3, 2
69 
};
70 
 
71 
 
72 
unsigned int b2mask[] = { 0, 0xff, 0xffff, 0xffffff, 0xffffffff };
73 
unsigned int b2signbit[] = { 0, (1 << 7), (1 << 15), (1 << 24), (1 << 31) };
74 
int b2maxsigned[] = { 0, 0x7f, 0x7fff, 0x7fffff, 0x7fffffff };
75 
int b2minsigned[] = { 0, -128, -32768, -8388608, -2147483647 - 1 };
76 
 
77 
static regs_type oldregs;
78 
 
79 
int m32c_opcode_pc;
80 
 
81 
void
82 
init_regs (void)
83 
{
84 
  memset (&regs, 0, sizeof (regs));
85 
  memset (&oldregs, 0, sizeof (oldregs));
86 
}
87 
 
88 
void
89 
set_pointer_width (int bytes)
90 
{
91 
  if (bytes == 2)
92 
    {
93 
      addr_mask = 0xffff;
94 
      membus_mask = 0x000fffff;
95 
      reg_bytes[a0] = reg_bytes[a1] = reg_bytes[sb] = reg_bytes[fb] =
96 
        reg_bytes[sp] = reg_bytes[usp] = reg_bytes[isp] = 2;
97 
    }
98 
  else
99 
    {
100 
      addr_mask = 0xffffff;
101 
      membus_mask = 0x00ffffff;
102 
      reg_bytes[a0] = reg_bytes[a1] = reg_bytes[sb] = reg_bytes[fb] =
103 
        reg_bytes[sp] = reg_bytes[usp] = reg_bytes[isp] = 3;
104 
    }
105 
}
106 
 
107 
void
108 
m32c_set_cpu (int cpu)
109 
{
110 
  switch (cpu)
111 
    {
112 
    case CPU_R8C:
113 
    case CPU_M16C:
114 
      set_pointer_width (2);
115 
      decode_opcode = decode_r8c;
116 
      break;
117 
    case CPU_M32CM:
118 
    case CPU_M32C:
119 
      set_pointer_width (3);
120 
      decode_opcode = decode_m32c;
121 
      break;
122 
    default:
123 
      abort ();
124 
    }
125 
  m32c_cpu = cpu;
126 
}
127 
 
128 
static unsigned int
129 
get_reg_i (reg_id id)
130 
{
131 
  reg_bank_type *b = regs.r + (FLAG_B ? 1 : 0);
132 
 
133 
  switch (id)
134 
    {
135 
    case r0:
136 
      return b->r_r0;
137 
    case r0h:
138 
      return b->r_r0 >> 8;
139 
    case r0l:
140 
      return b->r_r0 & 0xff;
141 
    case r1:
142 
      return b->r_r1;
143 
    case r1h:
144 
      return b->r_r1 >> 8;
145 
    case r1l:
146 
      return b->r_r1 & 0xff;
147 
    case r2:
148 
      return b->r_r2;
149 
    case r2r0:
150 
      return b->r_r2 * 65536 + b->r_r0;
151 
    case r3:
152 
      return b->r_r3;
153 
    case r3r1:
154 
      return b->r_r3 * 65536 + b->r_r1;
155 
 
156 
    case a0:
157 
      return b->r_a0 & addr_mask;
158 
    case a1:
159 
      return b->r_a1 & addr_mask;
160 
    case a1a0:
161 
      return (b->r_a1 & 0xffff) * 65536 | (b->r_a0 & 0xffff);
162 
 
163 
    case sb:
164 
      return b->r_sb & addr_mask;
165 
    case fb:
166 
      return b->r_fb & addr_mask;
167 
 
168 
    case intb:
169 
      return regs.r_intbh * 65536 + regs.r_intbl;
170 
    case intbl:
171 
      return regs.r_intbl;
172 
    case intbh:
173 
      return regs.r_intbh;
174 
 
175 
    case sp:
176 
      return ((regs.r_flags & FLAGBIT_U) ? regs.r_usp : regs.
177 
              r_isp) & addr_mask;
178 
    case usp:
179 
      return regs.r_usp & addr_mask;
180 
    case isp:
181 
      return regs.r_isp & addr_mask;
182 
 
183 
    case pc:
184 
      return regs.r_pc & membus_mask;
185 
    case flags:
186 
      return regs.r_flags;
187 
    default:
188 
      abort ();
189 
    }
190 
}
191 
 
192 
unsigned int
193 
get_reg (reg_id id)
194 
{
195 
  unsigned int rv = get_reg_i (id);
196 
  if (trace > ((id != pc && id != fb && id != sp) ? 0 : 1))
197 
    printf ("get_reg (%s) = %0*x\n", reg_names[id], reg_bytes[id] * 2, rv);
198 
  return rv;
199 
}
200 
 
201 
DI
202 
get_reg_ll (reg_id id)
203 
{
204 
  reg_bank_type *b = regs.r + (FLAG_B ? 1 : 0);
205 
 
206 
  switch (id)
207 
    {
208 
    case r3r1r2r0:
209 
      return ((DI) b->r_r3 << 48
210 
              | (DI) b->r_r1 << 32 | (DI) b->r_r2 << 16 | (DI) b->r_r0);
211 
    case r3r2r1r0:
212 
      return ((DI) b->r_r3 << 48
213 
              | (DI) b->r_r2 << 32 | (DI) b->r_r1 << 16 | (DI) b->r_r0);
214 
    default:
215 
      return get_reg (id);
216 
    }
217 
}
218 
 
219 
static int highest_sp = 0, lowest_sp = 0xffffff;
220 
 
221 
void
222 
stack_heap_stats ()
223 
{
224 
  printf ("heap:  %08x - %08x (%d bytes)\n", heapbottom, heaptop,
225 
          heaptop - heapbottom);
226 
  printf ("stack: %08x - %08x (%d bytes)\n", lowest_sp, highest_sp,
227 
          highest_sp - lowest_sp);
228 
}
229 
 
230 
void
231 
put_reg (reg_id id, unsigned int v)
232 
{
233 
  if (trace > ((id != pc) ? 0 : 1))
234 
    printf ("put_reg (%s) = %0*x\n", reg_names[id], reg_bytes[id] * 2, v);
235 
 
236 
  reg_bank_type *b = regs.r + (FLAG_B ? 1 : 0);
237 
  switch (id)
238 
    {
239 
    case r0:
240 
      b->r_r0 = v;
241 
      break;
242 
    case r0h:
243 
      b->r_r0 = (b->r_r0 & 0xff) | (v << 8);
244 
      break;
245 
    case r0l:
246 
      b->r_r0 = (b->r_r0 & 0xff00) | (v & 0xff);
247 
      break;
248 
    case r1:
249 
      b->r_r1 = v;
250 
      break;
251 
    case r1h:
252 
      b->r_r1 = (b->r_r1 & 0xff) | (v << 8);
253 
      break;
254 
    case r1l:
255 
      b->r_r1 = (b->r_r1 & 0xff00) | (v & 0xff);
256 
      break;
257 
    case r2:
258 
      b->r_r2 = v;
259 
      break;
260 
    case r2r0:
261 
      b->r_r0 = v & 0xffff;
262 
      b->r_r2 = v >> 16;
263 
      break;
264 
    case r3:
265 
      b->r_r3 = v;
266 
      break;
267 
    case r3r1:
268 
      b->r_r1 = v & 0xffff;
269 
      b->r_r3 = v >> 16;
270 
      break;
271 
 
272 
    case a0:
273 
      b->r_a0 = v & addr_mask;
274 
      break;
275 
    case a1:
276 
      b->r_a1 = v & addr_mask;
277 
      break;
278 
    case a1a0:
279 
      b->r_a0 = v & 0xffff;
280 
      b->r_a1 = v >> 16;
281 
      break;
282 
 
283 
    case sb:
284 
      b->r_sb = v & addr_mask;
285 
      break;
286 
    case fb:
287 
      b->r_fb = v & addr_mask;
288 
      break;
289 
 
290 
    case intb:
291 
      regs.r_intbl = v & 0xffff;
292 
      regs.r_intbh = v >> 16;
293 
      break;
294 
    case intbl:
295 
      regs.r_intbl = v & 0xffff;
296 
      break;
297 
    case intbh:
298 
      regs.r_intbh = v & 0xff;
299 
      break;
300 
 
301 
    case sp:
302 
      {
303 
        SI *spp;
304 
        if (regs.r_flags & FLAGBIT_U)
305 
          spp = &regs.r_usp;
306 
        else
307 
          spp = &regs.r_isp;
308 
        *spp = v & addr_mask;
309 
        if (*spp < heaptop)
310 
          {
311 
            printf ("collision: pc %08lx heap %08x stack %08lx\n", regs.r_pc,
312 
                    heaptop, *spp);
313 
            exit (1);
314 
          }
315 
        if (*spp < lowest_sp)
316 
          lowest_sp = *spp;
317 
        if (*spp > highest_sp)
318 
          highest_sp = *spp;
319 
        break;
320 
      }
321 
    case usp:
322 
      regs.r_usp = v & addr_mask;
323 
      break;
324 
    case isp:
325 
      regs.r_isp = v & addr_mask;
326 
      break;
327 
 
328 
    case pc:
329 
      regs.r_pc = v & membus_mask;
330 
      break;
331 
    case flags:
332 
      regs.r_flags = v;
333 
      break;
334 
    default:
335 
      abort ();
336 
    }
337 
}
338 
 
339 
int
340 
condition_true (int cond_id)
341 
{
342 
  int f;
343 
  if (A16)
344 
    {
345 
      static const char *cond_name[] = {
346 
        "C", "C&!Z", "Z", "S",
347 
        "!C", "!(C&!Z)", "!Z", "!S",
348 
        "(S^O)|Z", "O", "!(S^O)", "unk",
349 
        "!((S^O)|Z)", "!O", "S^O", "unk"
350 
      };
351 
      switch (cond_id & 15)
352 
        {
353 
        case 0:
354 
          f = FLAG_C;
355 
          break;                /* GEU/C */
356 
        case 1:
357 
          f = FLAG_C & !FLAG_Z;
358 
          break;                /* GTU */
359 
        case 2:
360 
          f = FLAG_Z;
361 
          break;                /* EQ/Z */
362 
        case 3:
363 
          f = FLAG_S;
364 
          break;                /* N */
365 
        case 4:
366 
          f = !FLAG_C;
367 
          break;                /* LTU/NC */
368 
        case 5:
369 
          f = !(FLAG_C & !FLAG_Z);
370 
          break;                /* LEU */
371 
        case 6:
372 
          f = !FLAG_Z;
373 
          break;                /* NE/NZ */
374 
        case 7:
375 
          f = !FLAG_S;
376 
          break;                /* PZ */
377 
 
378 
        case 8:
379 
          f = (FLAG_S ^ FLAG_O) | FLAG_Z;
380 
          break;                /* LE */
381 
        case 9:
382 
          f = FLAG_O;
383 
          break;                /* O */
384 
        case 10:
385 
          f = !(FLAG_S ^ FLAG_O);
386 
          break;                /* GE */
387 
        case 12:
388 
          f = !((FLAG_S ^ FLAG_O) | FLAG_Z);
389 
          break;                /* GT */
390 
        case 13:
391 
          f = !FLAG_O;
392 
          break;                /* NO */
393 
        case 14:
394 
          f = FLAG_S ^ FLAG_O;
395 
          break;                /* LT */
396 
 
397 
        default:
398 
          f = 0;
399 
          break;
400 
        }
401 
      if (trace)
402 
        printf ("cond[%d] %s = %s\n", cond_id, cond_name[cond_id & 15],
403 
                f ? "true" : "false");
404 
    }
405 
  else
406 
    {
407 
      static const char *cond_name[] = {
408 
        "!C", "LEU", "!Z", "PZ",
409 
        "!O", "GT", "GE", "?",
410 
        "C", "GTU", "Z", "N",
411 
        "O", "LE", "LT", "!?"
412 
      };
413 
      switch (cond_id & 15)
414 
        {
415 
        case 0:
416 
          f = !FLAG_C;
417 
          break;                /* LTU/NC */
418 
        case 1:
419 
          f = !(FLAG_C & !FLAG_Z);
420 
          break;                /* LEU */
421 
        case 2:
422 
          f = !FLAG_Z;
423 
          break;                /* NE/NZ */
424 
        case 3:
425 
          f = !FLAG_S;
426 
          break;                /* PZ */
427 
 
428 
        case 4:
429 
          f = !FLAG_O;
430 
          break;                /* NO */
431 
        case 5:
432 
          f = !((FLAG_S ^ FLAG_O) | FLAG_Z);
433 
          break;                /* GT */
434 
        case 6:
435 
          f = !(FLAG_S ^ FLAG_O);
436 
          break;                /* GE */
437 
 
438 
        case 8:
439 
          f = FLAG_C;
440 
          break;                /* GEU/C */
441 
        case 9:
442 
          f = FLAG_C & !FLAG_Z;
443 
          break;                /* GTU */
444 
        case 10:
445 
          f = FLAG_Z;
446 
          break;                /* EQ/Z */
447 
        case 11:
448 
          f = FLAG_S;
449 
          break;                /* N */
450 
 
451 
        case 12:
452 
          f = FLAG_O;
453 
          break;                /* O */
454 
        case 13:
455 
          f = (FLAG_S ^ FLAG_O) | FLAG_Z;
456 
          break;                /* LE */
457 
        case 14:
458 
          f = FLAG_S ^ FLAG_O;
459 
          break;                /* LT */
460 
 
461 
        default:
462 
          f = 0;
463 
          break;
464 
        }
465 
      if (trace)
466 
        printf ("cond[%d] %s = %s\n", cond_id, cond_name[cond_id & 15],
467 
                f ? "true" : "false");
468 
    }
469 
  return f;
470 
}
471 
 
472 
void
473 
set_flags (int mask, int newbits)
474 
{
475 
  int i;
476 
  regs.r_flags &= ~mask;
477 
  regs.r_flags |= newbits & mask;
478 
  if (trace)
479 
    {
480 
      printf ("flags now \033[32m %d", (regs.r_flags >> (A16 ? 8 : 12)) & 7);
481 
      for (i = 7; i >= 0; i--)
482 
        if (regs.r_flags & (1 << i))
483 
          putchar ("CDZSBOIU"[i]);
484 
        else
485 
          putchar ('-');
486 
      printf ("\033[0m\n");
487 
    }
488 
}
489 
 
490 
void
491 
set_oszc (int value, int b, int c)
492 
{
493 
  int mask = b2mask[b];
494 
  int f = 0;
495 
 
496 
  if (c)
497 
    f |= FLAGBIT_C;
498 
  if ((value & mask) == 0)
499 
    f |= FLAGBIT_Z;
500 
  if (value & b2signbit[b])
501 
    f |= FLAGBIT_S;
502 
  if ((value > b2maxsigned[b]) || (value < b2minsigned[b]))
503 
    f |= FLAGBIT_O;
504 
  set_flags (FLAGBIT_Z | FLAGBIT_S | FLAGBIT_O | FLAGBIT_C, f);
505 
}
506 
 
507 
void
508 
set_szc (int value, int b, int c)
509 
{
510 
  int mask = b2mask[b];
511 
  int f = 0;
512 
 
513 
  if (c)
514 
    f |= FLAGBIT_C;
515 
  if ((value & mask) == 0)
516 
    f |= FLAGBIT_Z;
517 
  if (value & b2signbit[b])
518 
    f |= FLAGBIT_S;
519 
  set_flags (FLAGBIT_Z | FLAGBIT_S | FLAGBIT_C, f);
520 
}
521 
 
522 
void
523 
set_osz (int value, int b)
524 
{
525 
  int mask = b2mask[b];
526 
  int f = 0;
527 
 
528 
  if ((value & mask) == 0)
529 
    f |= FLAGBIT_Z;
530 
  if (value & b2signbit[b])
531 
    f |= FLAGBIT_S;
532 
  if (value & ~mask && (value & ~mask) != ~mask)
533 
    f |= FLAGBIT_O;
534 
  set_flags (FLAGBIT_Z | FLAGBIT_S | FLAGBIT_O, f);
535 
}
536 
 
537 
void
538 
set_sz (int value, int b)
539 
{
540 
  int mask = b2mask[b];
541 
  int f = 0;
542 
 
543 
  if ((value & mask) == 0)
544 
    f |= FLAGBIT_Z;
545 
  if (value & b2signbit[b])
546 
    f |= FLAGBIT_S;
547 
  set_flags (FLAGBIT_Z | FLAGBIT_S, f);
548 
}
549 
 
550 
void
551 
set_zc (int z, int c)
552 
{
553 
  set_flags (FLAGBIT_C | FLAGBIT_Z,
554 
             (c ? FLAGBIT_C : 0) | (z ? FLAGBIT_Z : 0));
555 
}
556 
 
557 
void
558 
set_c (int c)
559 
{
560 
  set_flags (FLAGBIT_C, c ? FLAGBIT_C : 0);
561 
}
562 
 
563 
void
564 
put_reg_ll (reg_id id, DI v)
565 
{
566 
  reg_bank_type *b = regs.r + (FLAG_B ? 1 : 0);
567 
 
568 
  switch (id)
569 
    {
570 
    case r3r1r2r0:
571 
      b->r_r3 = v >> 48;
572 
      b->r_r1 = v >> 32;
573 
      b->r_r2 = v >> 16;
574 
      b->r_r0 = v;
575 
      break;
576 
    case r3r2r1r0:
577 
      b->r_r3 = v >> 48;
578 
      b->r_r2 = v >> 32;
579 
      b->r_r1 = v >> 16;
580 
      b->r_r0 = v;
581 
      break;
582 
    default:
583 
      put_reg (id, v);
584 
    }
585 
}
586 
 
587 
static void
588 
print_flags (int f)
589 
{
590 
  int i;
591 
  static char fn[] = "CDZSBOIU";
592 
  printf ("%d.", (f >> 12) & 7);
593 
  for (i = 7; i >= 0; i--)
594 
    if (f & (1 << i))
595 
      putchar (fn[i]);
596 
}
597 
 
598 
#define TRC(f,n, id) \
599 
  if (oldregs.f != regs.f) \
600 
    { \
601 
      printf("  %s %0*x:%0*x", n, \
602 
             reg_bytes[id]*2, (unsigned int)oldregs.f, \
603 
             reg_bytes[id]*2, (unsigned int)regs.f); \
604 
      oldregs.f = regs.f; \
605 
    }
606 
 
607 
void
608 
trace_register_changes ()
609 
{
610 
  if (!trace)
611 
    return;
612 
  printf ("\033[36mREGS:");
613 
  TRC (r[0].r_r0, "r0", r0);
614 
  TRC (r[0].r_r1, "r1", r1);
615 
  TRC (r[0].r_r2, "r2", r2);
616 
  TRC (r[0].r_r3, "r3", r3);
617 
  TRC (r[0].r_a0, "a0", a0);
618 
  TRC (r[0].r_a1, "a1", a1);
619 
  TRC (r[0].r_sb, "sb", sb);
620 
  TRC (r[0].r_fb, "fb", fb);
621 
  TRC (r[1].r_r0, "r0'", r0);
622 
  TRC (r[1].r_r1, "r1'", r1);
623 
  TRC (r[1].r_r2, "r2'", r2);
624 
  TRC (r[1].r_r3, "r3'", r3);
625 
  TRC (r[1].r_a0, "a0'", a0);
626 
  TRC (r[1].r_a1, "a1'", a1);
627 
  TRC (r[1].r_sb, "sb'", sb);
628 
  TRC (r[1].r_fb, "fb'", fb);
629 
  TRC (r_intbh, "intbh", intbh);
630 
  TRC (r_intbl, "intbl", intbl);
631 
  TRC (r_usp, "usp", usp);
632 
  TRC (r_isp, "isp", isp);
633 
  TRC (r_pc, "pc", pc);
634 
  if (oldregs.r_flags != regs.r_flags)
635 
    {
636 
      printf ("  flags ");
637 
      print_flags (oldregs.r_flags);
638 
      printf (":");
639 
      print_flags (regs.r_flags);
640 
    }
641 
  printf ("\033[0m\n");
642 
}
643 
 
644 
#define DRC(f, n, id) \
645 
  printf("  %-3s %0*x", n,                             \
646 
         reg_bytes[id]*2, (unsigned int)regs.f);       \
647 
 
648 
void
649 
m32c_dump_all_registers ()
650 
{
651 
  printf ("\033[36mREGS:");
652 
  DRC (r[0].r_r0, "r0", r0);
653 
  DRC (r[0].r_r1, "r1", r1);
654 
  DRC (r[0].r_r2, "r2", r2);
655 
  DRC (r[0].r_r3, "r3", r3);
656 
  DRC (r[0].r_a0, "a0", a0);
657 
  DRC (r[0].r_a1, "a1", a1);
658 
  DRC (r[0].r_sb, "sb", sb);
659 
  DRC (r[0].r_fb, "fb", fb);
660 
  printf ("\n     ");
661 
  DRC (r[1].r_r0, "r0'", r0);
662 
  DRC (r[1].r_r1, "r1'", r1);
663 
  DRC (r[1].r_r2, "r2'", r2);
664 
  DRC (r[1].r_r3, "r3'", r3);
665 
  DRC (r[1].r_a0, "a0'", a0);
666 
  DRC (r[1].r_a1, "a1'", a1);
667 
  DRC (r[1].r_sb, "sb'", sb);
668 
  DRC (r[1].r_fb, "fb'", fb);
669 
  printf ("     \n");
670 
  DRC (r_intbh, "intbh", intbh);
671 
  DRC (r_intbl, "intbl", intbl);
672 
  DRC (r_usp, "usp", usp);
673 
  DRC (r_isp, "isp", isp);
674 
  DRC (r_pc, "pc", pc);
675 
  printf ("  flags ");
676 
  print_flags (regs.r_flags);
677 
  printf ("\033[0m\n");
678 
  /*sim_disasm_one (); */
679 
}

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