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c906108c SS |
1 | /* support routines for interpreted instructions |
2 | Copyright (C) 1992, 1993 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of Z8KSIM | |
5 | ||
6 | Z8KSIM 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 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | Z8KSIM is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with Z8KZIM; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #include "config.h" | |
21 | ||
22 | #include <ansidecl.h> | |
23 | #include <signal.h> | |
24 | #include <errno.h> | |
25 | ||
26 | #include "tm.h" | |
27 | #include "sim.h" | |
28 | #include "mem.h" | |
29 | #include <stdio.h> | |
30 | #ifdef HAVE_TIME_H | |
31 | #include <time.h> | |
32 | #endif | |
33 | #ifdef HAVE_SYS_TIMES_H | |
34 | #include <sys/times.h> | |
35 | #endif | |
36 | #include <sys/types.h> | |
37 | #include <sys/stat.h> | |
38 | #include <sys/param.h> | |
3c25f8c7 AC |
39 | #include "gdb/callback.h" |
40 | #include "gdb/remote-sim.h" | |
c906108c SS |
41 | #include "syscall.h" |
42 | ||
43 | static int get_now PARAMS ((void)); | |
44 | static int now_persec PARAMS ((void)); | |
45 | static int put_long PARAMS ((sim_state_type * context, int ptr, int value)); | |
46 | static int put_short PARAMS ((sim_state_type * context, int ptr, int value)); | |
47 | ||
48 | int sim_z8001_mode; | |
49 | ||
50 | static int | |
51 | get_now () | |
52 | { | |
53 | #ifdef HAVE_SYS_TIMES_H | |
54 | struct tms b; | |
55 | ||
56 | times (&b); | |
57 | return b.tms_utime + b.tms_stime; | |
58 | #else | |
59 | return time (0); | |
60 | #endif | |
61 | } | |
62 | ||
63 | static int | |
64 | now_persec () | |
65 | { | |
66 | return 50; | |
67 | } | |
68 | ||
69 | ||
70 | /* #define LOG /* define this to print instruction use counts */ | |
71 | ||
72 | #ifdef __GNUC__ | |
73 | #define INLINE __inline__ | |
74 | #include "inlines.h" | |
75 | #else | |
76 | #include "inlines.h" | |
77 | #endif | |
78 | ||
79 | /* This holds the entire cpu context */ | |
80 | static sim_state_type the_state; | |
81 | ||
82 | int | |
83 | fail (context, dummy) | |
84 | sim_state_type *context; | |
85 | int dummy; | |
86 | { | |
87 | context->exception = SIM_BAD_INST; | |
88 | return 1; | |
89 | } | |
90 | ||
91 | void | |
92 | sfop_bad1 (context) | |
93 | sim_state_type *context; | |
94 | { | |
95 | context->exception | |
96 | = SIM_BAD_INST; | |
97 | } | |
98 | ||
99 | void | |
100 | bfop_bad1 (context) | |
101 | sim_state_type *context; | |
102 | { | |
103 | context->exception | |
104 | = SIM_BAD_INST; | |
105 | } | |
106 | ||
107 | void | |
108 | fop_bad (context) | |
109 | sim_state_type *context; | |
110 | { | |
111 | context->exception = | |
112 | SIM_BAD_INST; | |
113 | } | |
114 | ||
115 | /* Table of bit counts for all byte values */ | |
116 | ||
117 | char the_parity[256] = | |
118 | { | |
119 | 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, 1, 2, 2, 3, 2, 3, 3, | |
120 | 4, 2, 3, 3, 4, 3, 4, 4, 5, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, | |
121 | 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 1, 2, 2, 3, 2, | |
122 | 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, | |
123 | 4, 5, 5, 6, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, | |
124 | 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, | |
125 | 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, | |
126 | 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, | |
127 | 4, 5, 5, 6, 5, 6, 6, 7, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, | |
128 | 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 3, 4, 4, 5, 4, 5, | |
129 | 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, | |
130 | 7, 7, 8}; | |
131 | ||
132 | ||
133 | int read (); | |
134 | int write (); | |
135 | int open (); | |
136 | int close (); | |
137 | int open (); | |
138 | int close (); | |
139 | ||
140 | int link (); | |
141 | int fstat (); | |
142 | ||
143 | static int | |
144 | put_short (context, ptr, value) | |
145 | sim_state_type *context; | |
146 | int ptr; | |
147 | int value; | |
148 | { | |
149 | put_word_mem_da (context, ptr, value); | |
150 | return ptr + 2; | |
151 | } | |
152 | ||
153 | static int | |
154 | put_long (context, ptr, value) | |
155 | sim_state_type *context; | |
156 | int | |
157 | ptr; | |
158 | int value; | |
159 | { | |
160 | put_long_mem_da (context, ptr, value); | |
161 | return ptr + 4; | |
162 | } | |
163 | ||
164 | #define aptr(x) ((sitoptr(x)) + (char *)(context->memory)) | |
165 | ||
166 | static int args[3]; | |
167 | static int arg_index; /* Translate a z8k system call into a host system call */ | |
168 | void | |
169 | support_call (context, sc) | |
170 | sim_state_type *context; | |
171 | int sc; | |
172 | { | |
173 | extern int errno; | |
174 | int ret; | |
175 | int retnext = 0; | |
176 | int fd; | |
177 | ||
178 | int olderrno = errno; | |
179 | errno = 0; | |
180 | switch (sc) | |
181 | { | |
182 | case SYS_ARG: | |
183 | args[arg_index++] = context->regs[0].word << 16 | context->regs[1].word; | |
184 | break; | |
185 | case SYS_exit: | |
186 | context->exception = SIM_DONE; | |
187 | ret = args[0]; | |
188 | arg_index = 0; | |
189 | break; | |
190 | case SYS_close: | |
191 | ret = close ((int) (args[0])); | |
192 | arg_index = 0; | |
193 | break; | |
194 | case SYS_creat: | |
195 | ret = creat (aptr (args[0]), args[1]); | |
196 | arg_index = 0; | |
197 | break; | |
198 | case SYS_isatty: | |
199 | ret = isatty (args[0]); | |
200 | arg_index = 0; | |
201 | break; | |
202 | case SYS_open: | |
203 | ret = open (aptr (args[0]), args[1], args[2]); | |
204 | arg_index = 0; | |
205 | break; | |
206 | case SYS_lseek: | |
207 | ret = lseek (args[0], (off_t) args[1], args[2]); | |
208 | arg_index = 0; | |
209 | break; | |
210 | case SYS_read: | |
211 | ret = read (args[0], aptr (args[1]), args[2]); | |
212 | arg_index = 0; | |
213 | break; | |
214 | case SYS_write: | |
215 | ret = write (args[0],aptr (args[1]), args[2]); | |
216 | arg_index = 0; | |
217 | break; | |
218 | case SYS_time: | |
219 | { | |
220 | int dst = args[0]; | |
221 | ||
222 | ret = time (0); | |
223 | if (dst) | |
224 | { | |
225 | put_long_mem_da (context, | |
226 | sitoptr (dst), ret); | |
227 | } | |
228 | retnext = ret; | |
229 | ret = retnext >> 16; | |
230 | arg_index = 0; | |
231 | } | |
232 | break; | |
233 | case SYS_fstat: | |
234 | { | |
235 | int buf; | |
236 | struct stat host_stat; | |
237 | fd = args[0]; | |
238 | buf = sitoptr (args[1]); | |
239 | ret = fstat (fd, &host_stat); | |
240 | buf = put_short (context, buf, host_stat.st_dev); | |
241 | buf = put_short (context, buf, host_stat.st_ino); | |
242 | /* FIXME: Isn't mode_t 4 bytes? */ | |
243 | buf = put_short (context, buf, host_stat.st_mode); | |
244 | buf = put_short (context, buf, host_stat.st_nlink); | |
245 | buf = put_short (context, buf, host_stat.st_uid); | |
246 | buf = put_short (context, buf, host_stat.st_uid); | |
247 | buf = put_short (context, buf, host_stat.st_rdev); | |
248 | buf = put_long (context, buf, host_stat.st_size); | |
249 | buf = put_long (context, buf, host_stat.st_atime); | |
250 | arg_index = 0; | |
251 | } break; | |
252 | default: | |
253 | case SYS_link: | |
254 | context->exception = SIM_BAD_SYSCALL; | |
255 | arg_index = 0; | |
256 | break; | |
257 | } | |
258 | context->regs[2].word = ret; | |
259 | context->regs[3].word = retnext; | |
260 | context->regs[5].word = errno; | |
261 | ||
262 | ||
263 | /* support for the stdcall calling convention */ | |
264 | context->regs[6].word = retnext; | |
265 | context->regs[7].word = ret; | |
266 | ||
267 | errno = olderrno; | |
268 | } | |
269 | ||
270 | #undef get_word_mem_da | |
271 | ||
272 | int | |
273 | get_word_mem_da (context, addr) | |
274 | sim_state_type *context; | |
275 | int addr; | |
276 | { | |
277 | return (get_byte_mem_da (context, addr) << 8) | (get_byte_mem_da (context, addr + 1)); | |
278 | ||
279 | } | |
280 | ||
281 | #undef get_word_reg | |
282 | int | |
283 | get_word_reg (context, reg) sim_state_type | |
284 | * context; | |
285 | int reg; | |
286 | { | |
287 | return context->regs[reg].word; | |
288 | } | |
289 | ||
290 | #ifdef LOG | |
291 | int log[64 * 1024]; | |
292 | ||
293 | #endif | |
294 | ||
295 | void | |
296 | tm_store_register (regno, value) | |
297 | int regno; | |
298 | int value; | |
299 | { | |
300 | switch | |
301 | (regno) | |
302 | { | |
303 | case REG_PC: | |
304 | the_state.sometimes_pc = value; | |
305 | break; | |
306 | ||
307 | default: | |
308 | put_word_reg (&the_state, regno, value); | |
309 | } | |
310 | } | |
311 | ||
312 | void | |
313 | swap_long (buf, val) | |
314 | char *buf; | |
315 | int val; | |
316 | { | |
317 | buf[0] = val >> 24; | |
318 | buf[1] = val >> 16; | |
319 | buf[2] = val >> 8; | |
320 | buf[3] = val >> 0; | |
321 | } | |
322 | ||
323 | void | |
324 | swap_word (buf, val) | |
325 | char *buf; | |
326 | int val; | |
327 | { | |
328 | buf[0] = val >> 8; | |
329 | buf[1] = val >> 0; | |
330 | } | |
331 | ||
332 | void | |
333 | tm_fetch_register (regno, buf) | |
334 | int regno; | |
335 | char *buf; | |
336 | { | |
337 | switch | |
338 | (regno) | |
339 | { | |
340 | case REG_CYCLES: | |
341 | swap_long (buf, the_state.cycles); | |
342 | break; | |
343 | case REG_INSTS: | |
344 | swap_long (buf, the_state.insts); | |
345 | break; | |
346 | case | |
347 | REG_TIME: | |
348 | swap_long (buf, the_state.ticks); | |
349 | break; | |
350 | case REG_PC: | |
351 | swap_long (buf, the_state.sometimes_pc); | |
352 | break; | |
353 | case REG_SP: | |
354 | { | |
355 | if (sim_z8001_mode) | |
356 | { | |
357 | swap_long (buf, get_long_reg (&the_state, 14)); | |
358 | } | |
359 | else | |
360 | { | |
361 | swap_long (buf, get_word_reg (&the_state, 15)); | |
362 | } | |
363 | } | |
364 | break; | |
365 | case | |
366 | REG_FP: | |
367 | { | |
368 | if (sim_z8001_mode) | |
369 | { | |
370 | swap_long (buf, get_long_reg | |
371 | (&the_state, 10)); | |
372 | } | |
373 | else | |
374 | { | |
375 | swap_long (buf, | |
376 | get_word_reg (&the_state, 10)); | |
377 | } | |
378 | } | |
379 | break; | |
380 | default: | |
381 | { | |
382 | swap_word (buf, | |
383 | get_word_reg (&the_state, regno)); | |
384 | } | |
385 | } | |
386 | } | |
387 | ||
388 | void | |
389 | tm_resume (step) | |
390 | int step; | |
391 | { | |
392 | int now = get_now (); | |
393 | struct op_info | |
394 | *p; | |
395 | int word; | |
396 | int pc; | |
397 | extern int (*(sfop_table[])) (); | |
398 | extern int (*(bfop_table[])) (); | |
399 | int (*((*table))) (); | |
400 | sim_state_type *context = &the_state; | |
401 | ||
402 | if (step) | |
403 | { | |
404 | context->exception = SIM_SINGLE_STEP; | |
405 | } | |
406 | else | |
407 | { | |
408 | context->exception = 0; | |
409 | } | |
410 | ||
411 | pc = context->sometimes_pc; | |
412 | if (sim_z8001_mode) | |
413 | { | |
414 | table = bfop_table; | |
415 | pc = MAP_PHYSICAL_TO_LOGICAL (pc); | |
416 | } | |
417 | else | |
418 | { | |
419 | table = sfop_table; | |
420 | } | |
421 | ||
422 | ||
423 | do | |
424 | { | |
425 | word = get_word_mem_da (context, pc); | |
426 | p = op_info_table + word; | |
427 | ||
428 | #ifdef LOG | |
429 | log[word]++; | |
430 | #endif | |
431 | pc = table[p->exec] (context, pc, word); | |
432 | context->insts++; | |
433 | ||
434 | } | |
435 | while (!context->exception); | |
436 | ||
437 | ||
438 | ||
439 | context->sometimes_pc = MAP_LOGICAL_TO_PHYSICAL (pc); | |
440 | context->ticks += get_now () - now; | |
441 | } | |
442 | ||
443 | int | |
444 | tm_signal () | |
445 | { | |
446 | return the_state.exception; | |
447 | } | |
448 | ||
449 | void | |
450 | tm_info_print (x) | |
451 | sim_state_type *x; | |
452 | { | |
453 | double timetaken = (double) x->ticks / (double) now_persec (); | |
454 | double virttime = x->cycles / 4.0e6; | |
455 | ||
456 | printf ("instructions executed : %9d\n", x->insts); | |
457 | printf ("cycles counted : %9d \n", x->cycles); | |
458 | printf ("cycles / inst : %9.1f \n", (double) x->cycles / (double) x->insts); | |
459 | printf ("virtual time taked (at 4 Mhz) : %9.1f \n", virttime); | |
460 | printf ("real time taken : %9.1f \n", timetaken); | |
461 | ||
462 | if (timetaken) | |
463 | { | |
464 | printf ("virtual instructions per second : %9.1f\n", x->insts / timetaken); | |
465 | printf ("emulation speed : %9.1f%%\n", virttime / timetaken * 100.0); | |
466 | } | |
467 | #ifdef LOG | |
468 | { | |
469 | extern int quick[]; | |
470 | ||
471 | for (i = 0; quick[i]; i++) | |
472 | { | |
473 | log[quick[i]] += 100000; | |
474 | } | |
475 | } | |
476 | ||
477 | for (i = 0; i < 64 * 1024; i++) | |
478 | { | |
479 | if (log[i]) | |
480 | { | |
481 | printf (" /*%7d*/ 0x%x,\n", log[i], i); | |
482 | } | |
483 | } | |
484 | #endif | |
485 | ||
486 | } | |
487 | ||
488 | int | |
489 | sim_trace (sd) | |
490 | SIM_DESC sd; | |
491 | { | |
492 | int i; | |
493 | char buffer[10]; | |
494 | int r; | |
495 | ||
496 | printf ("\n"); | |
497 | for (r = 0; r < 16; r++) | |
498 | { | |
499 | int m; | |
500 | ||
501 | printf ("r%2d", r); | |
502 | printf ("=%04x ", get_word_reg (&the_state, | |
503 | r)); | |
504 | for (m = -4; m < 8; m++) | |
505 | { | |
506 | if (m == 0) | |
507 | printf (">"); | |
508 | printf ("%04x ", | |
509 | get_word_mem_da (&the_state, (0xfffe & get_word_reg (&the_state, r)) + m * 2)); | |
510 | } | |
511 | printf ("\n"); | |
512 | } | |
513 | ||
514 | printf ("\n"); | |
515 | printf ("%9d %9d %08x ", the_state.cycles, | |
516 | the_state.insts, the_state.sometimes_pc); | |
517 | ||
518 | for (i = 0; i < 6; i++) | |
519 | { | |
520 | buffer[i] = get_byte_mem_da (&the_state, | |
521 | the_state.sometimes_pc + i); | |
522 | } | |
523 | ||
524 | print_insn_z8001 (the_state.sometimes_pc, buffer, stdout); | |
525 | printf | |
526 | ("\n"); | |
527 | tm_resume (1); | |
528 | if (the_state.exception != SIM_SINGLE_STEP) | |
529 | return 1; | |
530 | return 0; | |
531 | } | |
532 | ||
533 | void | |
534 | tm_state (x) | |
535 | sim_state_type *x; | |
536 | { | |
537 | *x = the_state; | |
538 | } | |
539 | ||
540 | void | |
541 | tm_exception (x) | |
542 | int x; | |
543 | { | |
544 | the_state.exception = x; | |
545 | } | |
546 | ||
547 | int | |
548 | tm_read_byte (x) | |
549 | int x; | |
550 | { | |
551 | x &= 0x3f00ffff; | |
552 | return sim_read_byte (&the_state, x); | |
553 | } | |
554 | ||
555 | void | |
556 | tm_write_byte (x, y) | |
557 | int x, y; | |
558 | { | |
559 | x &= 0x3f00ffff; | |
560 | sim_write_byte (&the_state, x, y); | |
561 | } | |
562 | ||
563 | #define SIGN(x) ((x) & MASK) | |
564 | normal_flags_32(context,d,sa,sb,sub) | |
565 | sim_state_type *context; | |
566 | unsigned int d; | |
567 | unsigned int sa; | |
568 | unsigned int sb; | |
569 | unsigned int sub; | |
570 | { | |
571 | #undef MASK | |
572 | #define MASK (1<<31) | |
573 | context->broken_flags = 0; | |
574 | if (sub) | |
575 | PSW_CARRY = sa < sb; | |
576 | else | |
577 | PSW_CARRY = d < sa; | |
578 | if (sub) | |
579 | PSW_OVERFLOW = (SIGN(sa) != SIGN(sb)) && (SIGN(d) == SIGN(sb)); | |
580 | else | |
581 | PSW_OVERFLOW = (SIGN(sa) == SIGN(sb)) && (SIGN(d) != SIGN(sb)); | |
582 | ||
583 | PSW_SIGN = ((int)d) <0; | |
584 | PSW_ZERO = d == 0; | |
585 | } | |
586 | ||
587 | normal_flags_16(context,d,sal,sbl,sub) | |
588 | sim_state_type *context; | |
589 | unsigned int d; | |
590 | unsigned int sal; | |
591 | unsigned int sbl; | |
592 | unsigned short int sub; | |
593 | { | |
594 | unsigned short sa = sal; | |
595 | unsigned short sb = sbl; | |
596 | #undef MASK | |
597 | #define MASK (1<<15) | |
598 | context->broken_flags = 0; | |
599 | if (sub) | |
600 | PSW_CARRY = sal < sbl; | |
601 | else | |
602 | PSW_CARRY = (d & 0x10000) != 0; | |
603 | ||
604 | if (sub) | |
605 | PSW_OVERFLOW = (SIGN(sa) != SIGN(sb)) && (SIGN(d) == SIGN(sb)); | |
606 | else | |
607 | PSW_OVERFLOW = (SIGN(sa) == SIGN(sb)) && (SIGN(d) != SIGN(sb)); | |
608 | ||
609 | PSW_SIGN = ((short int)d) <0; | |
610 | PSW_ZERO = ((short)d) == 0; | |
611 | } | |
612 | ||
613 | normal_flags_8(context,d,sa,sb,sub) | |
614 | sim_state_type *context; | |
615 | unsigned char d; | |
616 | unsigned char sa; | |
617 | unsigned char sb; | |
618 | unsigned char sub; | |
619 | { | |
620 | #undef MASK | |
621 | #define MASK (1<<7) | |
622 | context->broken_flags = 0; | |
623 | if (sub) | |
624 | PSW_CARRY = sa < sb; | |
625 | else | |
626 | PSW_CARRY = d < sa; | |
627 | if (sub) | |
628 | PSW_OVERFLOW = (SIGN(sa) != SIGN(sb)) && (SIGN(d) == SIGN(sb)); | |
629 | else | |
630 | PSW_OVERFLOW = (SIGN(sa) == SIGN(sb)) && (SIGN(d) != SIGN(sb)); | |
631 | PSW_SIGN = ((char)d) <0; | |
632 | PSW_ZERO = d == 0; | |
633 | } | |
634 | ||
635 | ||
636 | static int | |
637 | is_cond_true (context, c) | |
638 | sim_state_type *context; | |
639 | int c; | |
640 | { | |
641 | switch (c) | |
642 | { | |
643 | case T: | |
644 | return 1; | |
645 | case F: | |
646 | return 0; /* F */ | |
647 | case LE: | |
648 | return (PSW_ZERO | (PSW_SIGN ^ PSW_OVERFLOW)) & 1; /*LE */ | |
649 | case GT: | |
650 | return (~(PSW_ZERO | (PSW_SIGN ^ PSW_OVERFLOW))) & 1; /*GT */ | |
651 | case 0x5: | |
652 | return (PSW_SIGN & 1); /* sign */ | |
653 | case 0xd: | |
654 | return (~(PSW_SIGN)) & 1; /* not sign */ | |
655 | case 0x3: | |
656 | return ((PSW_CARRY | PSW_ZERO) & 1); /* ule*/ | |
657 | case UGT: | |
658 | return ((~(PSW_CARRY | PSW_ZERO)) & 1); /* ugt */ | |
659 | case 0x4: | |
660 | return (PSW_OVERFLOW & 1);/* overflow */ | |
661 | case 0xc: | |
662 | return (~(PSW_OVERFLOW)) & 1; /* not overflow */ | |
663 | case LT: | |
664 | return (PSW_SIGN ^ PSW_OVERFLOW) & 1; /* LT */ | |
665 | case GE: | |
666 | return (~(PSW_SIGN ^ PSW_OVERFLOW)) & 1; /* GE */ | |
667 | case EQ: | |
668 | return (PSW_ZERO) & 1; /* zero */ | |
669 | case NE: | |
670 | return ((~PSW_ZERO) & 1); /* not zero */ | |
671 | case 0x7: | |
672 | return (PSW_CARRY) & 1; /* carry */ | |
673 | case 0xf: | |
674 | return (~PSW_CARRY) & 1; /* not carry */ | |
675 | default: | |
676 | abort (); | |
677 | } | |
678 | } | |
679 | ||
680 | int | |
681 | COND (context, c) | |
682 | sim_state_type *context; | |
683 | int c; | |
684 | { | |
685 | if (c == 8) | |
686 | return 1; | |
687 | ||
688 | /* We can calculate what the flags would have been by | |
689 | looking at the src and dst and size of the operation */ | |
690 | ||
691 | if (context->broken_flags) | |
692 | { | |
693 | int slow = 0; | |
694 | int size; | |
695 | int dst; | |
696 | int srca; | |
697 | int srcb; | |
698 | int mask; | |
699 | int ans; | |
700 | ||
701 | /* see if we can short-cut the nasty flag calcs */ | |
702 | ||
703 | switch (size = context->size) | |
704 | { | |
705 | default: | |
706 | abort(); | |
707 | return 0; | |
708 | case 8: | |
709 | srca = (char) (context->srca); | |
710 | srcb = (char) (context->srcb); | |
711 | dst = (char) (context->dst); | |
712 | mask = 0xff; | |
713 | break; | |
714 | case 16: | |
715 | srca = (short) (context->srca); | |
716 | srcb = (short) (context->srcb); | |
717 | dst = (short) (context->dst); | |
718 | mask = 0xffff; | |
719 | break; | |
720 | case 32: | |
721 | srca = (long) (context->srca); | |
722 | srcb = (long) (context->srcb); | |
723 | dst = (long) (context->dst); | |
724 | mask = 0xffffffff; | |
725 | break; | |
726 | } | |
727 | ||
728 | switch (c) | |
729 | { | |
730 | case T: | |
731 | return 1; | |
732 | case F: | |
733 | return 0; | |
734 | case EQ: | |
735 | return !dst; | |
736 | case NE: | |
737 | return dst; | |
738 | case GT: | |
739 | ans = ((dst)) > 0; | |
740 | if (slow) | |
741 | { | |
742 | if (is_cond_true (context, c) != ans) | |
743 | abort (); | |
744 | } | |
745 | return ans; | |
746 | case LE: | |
747 | ans = ((dst)) <= 0; | |
748 | if (slow) | |
749 | { | |
750 | if (is_cond_true (context, c) != ans) | |
751 | abort (); | |
752 | } | |
753 | return ans; | |
754 | case GE: | |
755 | ans = ((dst)) >= 0; | |
756 | if (slow) | |
757 | { | |
758 | if (is_cond_true (context, c) != ans) | |
759 | abort (); | |
760 | } | |
761 | return ans; | |
762 | case LT: | |
763 | ans = ((dst)) < 0; | |
764 | if (slow) | |
765 | { | |
766 | if (is_cond_true (context, c) != ans) | |
767 | abort (); | |
768 | } | |
769 | return ans; | |
770 | default: | |
771 | break; | |
772 | } | |
773 | ||
774 | /* Can't fake it, we'll have to work out the flags the | |
775 | hard way */ | |
776 | ||
777 | makeflags (context, mask); | |
778 | } | |
779 | ||
780 | /* don't know how to fake a test, inspect the flags | |
781 | the hard way */ | |
782 | ||
783 | return is_cond_true (context, c); | |
784 | } |