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4f8d4a38 DD |
1 | /* reg.c --- register set model for RX simulator. |
2 | ||
88b9d363 | 3 | Copyright (C) 2005-2022 Free Software Foundation, Inc. |
4f8d4a38 DD |
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 | ||
6df01ab8 MF |
21 | /* This must come before any other includes. */ |
22 | #include "defs.h" | |
4f8d4a38 DD |
23 | |
24 | #include <stdio.h> | |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
27 | ||
28 | #include "cpu.h" | |
29 | #include "bfd.h" | |
30 | #include "trace.h" | |
31 | ||
32 | int verbose = 0; | |
33 | int trace = 0; | |
34 | int enable_counting = 0; | |
35 | ||
36 | int rx_in_gdb = 1; | |
37 | ||
38 | int rx_flagmask; | |
39 | int rx_flagand; | |
40 | int rx_flagor; | |
41 | ||
42 | int rx_big_endian; | |
43 | regs_type regs; | |
44 | int step_result; | |
45 | unsigned int heapbottom = 0; | |
46 | unsigned int heaptop = 0; | |
47 | ||
48 | char *reg_names[] = { | |
49 | /* general registers */ | |
50 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
51 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
52 | /* control register */ | |
53 | "psw", "pc", "usp", "fpsw", "RES", "RES", "RES", "RES", | |
54 | "bpsw", "bpc", "isp", "fintv", "intb", "RES", "RES", "RES", | |
55 | "RES", "RES", "RES", "RES", "RES", "RES", "RES", "RES", | |
56 | "RES", "RES", "RES", "RES", "RES", "RES", "RES", "RES", | |
57 | "temp", "acc", "acchi", "accmi", "acclo" | |
58 | }; | |
59 | ||
60 | unsigned int b2mask[] = { 0, 0xff, 0xffff, 0xffffff, 0xffffffff }; | |
61 | unsigned int b2signbit[] = { 0, (1 << 7), (1 << 15), (1 << 24), (1 << 31) }; | |
62 | int b2maxsigned[] = { 0, 0x7f, 0x7fff, 0x7fffff, 0x7fffffff }; | |
63 | int b2minsigned[] = { 0, -128, -32768, -8388608, -2147483647 - 1 }; | |
64 | ||
65 | static regs_type oldregs; | |
66 | ||
67 | void | |
68 | init_regs (void) | |
69 | { | |
70 | memset (®s, 0, sizeof (regs)); | |
71 | memset (&oldregs, 0, sizeof (oldregs)); | |
93378652 DD |
72 | |
73 | #ifdef CYCLE_ACCURATE | |
74 | regs.rt = -1; | |
75 | oldregs.rt = -1; | |
76 | #endif | |
4f8d4a38 DD |
77 | } |
78 | ||
79 | static unsigned int | |
80 | get_reg_i (int id) | |
81 | { | |
82 | if (id == 0) | |
83 | return regs.r_psw & FLAGBIT_U ? regs.r_usp : regs.r_isp; | |
84 | ||
85 | if (id >= 1 && id <= 15) | |
86 | return regs.r[id]; | |
87 | ||
88 | switch (id) | |
89 | { | |
90 | case psw: | |
91 | return regs.r_psw; | |
92 | case fpsw: | |
93 | return regs.r_fpsw; | |
94 | case isp: | |
95 | return regs.r_isp; | |
96 | case usp: | |
97 | return regs.r_usp; | |
98 | case bpc: | |
99 | return regs.r_bpc; | |
100 | case bpsw: | |
101 | return regs.r_bpsw; | |
102 | case fintv: | |
103 | return regs.r_fintv; | |
104 | case intb: | |
105 | return regs.r_intb; | |
106 | case pc: | |
107 | return regs.r_pc; | |
108 | case r_temp_idx: | |
109 | return regs.r_temp; | |
110 | case acchi: | |
111 | return (SI)(regs.r_acc >> 32); | |
112 | case accmi: | |
113 | return (SI)(regs.r_acc >> 16); | |
114 | case acclo: | |
115 | return (SI)regs.r_acc; | |
116 | } | |
117 | abort(); | |
118 | } | |
119 | ||
120 | unsigned int | |
121 | get_reg (int id) | |
122 | { | |
123 | unsigned int rv = get_reg_i (id); | |
124 | if (trace > ((id != pc && id != sp) ? 0 : 1)) | |
125 | printf ("get_reg (%s) = %08x\n", reg_names[id], rv); | |
126 | return rv; | |
127 | } | |
128 | ||
129 | static unsigned long long | |
130 | get_reg64_i (int id) | |
131 | { | |
132 | switch (id) | |
133 | { | |
134 | case acc64: | |
135 | return regs.r_acc; | |
136 | default: | |
137 | abort (); | |
138 | } | |
139 | } | |
140 | ||
141 | unsigned long long | |
142 | get_reg64 (int id) | |
143 | { | |
144 | unsigned long long rv = get_reg64_i (id); | |
145 | if (trace > ((id != pc && id != sp) ? 0 : 1)) | |
146 | printf ("get_reg (%s) = %016llx\n", reg_names[id], rv); | |
147 | return rv; | |
148 | } | |
149 | ||
150 | static int highest_sp = 0, lowest_sp = 0xffffff; | |
151 | ||
152 | void | |
1c3e93a4 | 153 | stack_heap_stats (void) |
4f8d4a38 DD |
154 | { |
155 | if (heapbottom < heaptop) | |
156 | printf ("heap: %08x - %08x (%d bytes)\n", heapbottom, heaptop, | |
157 | heaptop - heapbottom); | |
158 | if (lowest_sp < highest_sp) | |
159 | printf ("stack: %08x - %08x (%d bytes)\n", lowest_sp, highest_sp, | |
160 | highest_sp - lowest_sp); | |
161 | } | |
162 | ||
163 | void | |
164 | put_reg (int id, unsigned int v) | |
165 | { | |
166 | if (trace > ((id != pc) ? 0 : 1)) | |
167 | printf ("put_reg (%s) = %08x\n", reg_names[id], v); | |
168 | ||
169 | ||
170 | switch (id) | |
171 | { | |
172 | case psw: | |
173 | regs.r_psw = v; | |
174 | break; | |
175 | case fpsw: | |
176 | { | |
177 | SI anded; | |
178 | /* This is an odd one - The Cx flags are AND'd, and the FS flag | |
179 | is synthetic. */ | |
180 | anded = regs.r_fpsw & v; | |
181 | anded |= ~ FPSWBITS_CMASK; | |
182 | regs.r_fpsw = v & anded; | |
183 | if (regs.r_fpsw & FPSWBITS_FMASK) | |
184 | regs.r_fpsw |= FPSWBITS_FSUM; | |
185 | else | |
186 | regs.r_fpsw &= ~FPSWBITS_FSUM; | |
187 | } | |
188 | break; | |
189 | case isp: | |
190 | regs.r_isp = v; | |
191 | break; | |
192 | case usp: | |
193 | regs.r_usp = v; | |
194 | break; | |
195 | case bpc: | |
196 | regs.r_bpc = v; | |
197 | break; | |
198 | case bpsw: | |
199 | regs.r_bpsw = v; | |
200 | break; | |
201 | case fintv: | |
202 | regs.r_fintv = v; | |
203 | break; | |
204 | case intb: | |
205 | regs.r_intb = v; | |
206 | break; | |
207 | case pc: | |
208 | regs.r_pc = v; | |
209 | break; | |
210 | ||
211 | case acchi: | |
212 | regs.r_acc = (regs.r_acc & 0xffffffffULL) | ((DI)v << 32); | |
213 | break; | |
214 | case accmi: | |
215 | regs.r_acc = (regs.r_acc & ~0xffffffff0000ULL) | ((DI)v << 16); | |
216 | break; | |
217 | case acclo: | |
218 | regs.r_acc = (regs.r_acc & ~0xffffffffULL) | ((DI)v); | |
219 | break; | |
220 | ||
221 | case 0: /* Stack pointer is "in" R0. */ | |
222 | { | |
223 | if (v < heaptop) | |
224 | { | |
225 | unsigned int line; | |
226 | const char * dummy; | |
227 | const char * fname = NULL; | |
228 | ||
229 | sim_get_current_source_location (& dummy, & fname, &line); | |
230 | ||
231 | /* The setjmp and longjmp functions play tricks with the stack pointer. */ | |
232 | if (fname == NULL | |
233 | || (strcmp (fname, "_setjmp") != 0 | |
234 | && strcmp (fname, "_longjmp") != 0)) | |
235 | { | |
236 | printf ("collision in %s: pc %08x heap %08x stack %08x\n", | |
237 | fname, (unsigned int) regs.r_pc, heaptop, v); | |
238 | exit (1); | |
239 | } | |
240 | } | |
241 | else | |
242 | { | |
243 | if (v < lowest_sp) | |
244 | lowest_sp = v; | |
245 | if (v > highest_sp) | |
246 | highest_sp = v; | |
247 | } | |
248 | ||
249 | if (regs.r_psw & FLAGBIT_U) | |
250 | regs.r_usp = v; | |
251 | else | |
252 | regs.r_isp = v; | |
253 | break; | |
254 | } | |
255 | ||
256 | default: | |
63c72d1a | 257 | if (id >= 1 && id <= 15) |
4f8d4a38 DD |
258 | regs.r[id] = v; |
259 | else | |
260 | abort (); | |
261 | } | |
262 | } | |
263 | ||
264 | void | |
265 | put_reg64 (int id, unsigned long long v) | |
266 | { | |
267 | if (trace > ((id != pc) ? 0 : 1)) | |
268 | printf ("put_reg (%s) = %016llx\n", reg_names[id], v); | |
269 | ||
270 | switch (id) | |
271 | { | |
272 | case acc64: | |
273 | regs.r_acc = v; | |
274 | break; | |
275 | default: | |
276 | abort (); | |
277 | } | |
278 | } | |
279 | ||
280 | int | |
281 | condition_true (int cond_id) | |
282 | { | |
283 | int f; | |
284 | ||
285 | static const char *cond_name[] = { | |
286 | "Z", | |
287 | "!Z", | |
288 | "C", | |
289 | "!C", | |
290 | "C&!Z", | |
291 | "!(C&!Z)", | |
292 | "!S", | |
293 | "S", | |
294 | "!(S^O)", | |
295 | "S^O", | |
296 | "!((S^O)|Z)", | |
297 | "(S^O)|Z", | |
298 | "O", | |
299 | "!O", | |
300 | "always", | |
301 | "never" | |
302 | }; | |
303 | switch (cond_id & 15) | |
304 | { | |
305 | case 0: | |
306 | f = FLAG_Z; | |
307 | break; /* EQ/Z */ | |
308 | case 1: | |
309 | f = !FLAG_Z; | |
310 | break; /* NE/NZ */ | |
311 | case 2: | |
312 | f = FLAG_C; | |
313 | break; /* GEU/C */ | |
314 | case 3: | |
315 | f = !FLAG_C; | |
316 | break; /* LTU/NC */ | |
317 | case 4: | |
318 | f = FLAG_C & !FLAG_Z; | |
319 | break; /* GTU */ | |
320 | case 5: | |
321 | f = !(FLAG_C & !FLAG_Z); | |
322 | break; /* LEU */ | |
323 | case 6: | |
324 | f = !FLAG_S; | |
325 | break; /* PZ */ | |
326 | case 7: | |
327 | f = FLAG_S; | |
328 | break; /* N */ | |
329 | ||
330 | case 8: | |
331 | f = !(FLAG_S ^ FLAG_O); | |
332 | break; /* GE */ | |
333 | case 9: | |
334 | f = FLAG_S ^ FLAG_O; | |
335 | break; /* LT */ | |
336 | case 10: | |
337 | f = !((FLAG_S ^ FLAG_O) | FLAG_Z); | |
338 | break; /* GT */ | |
339 | case 11: | |
340 | f = (FLAG_S ^ FLAG_O) | FLAG_Z; | |
341 | break; /* LE */ | |
342 | case 12: | |
343 | f = FLAG_O; | |
344 | break; /* O */ | |
345 | case 13: | |
346 | f = !FLAG_O; | |
347 | break; /* NO */ | |
348 | case 14: | |
349 | f = 1; /* always */ | |
350 | break; | |
351 | default: | |
352 | f = 0; /* never */ | |
353 | break; | |
354 | } | |
355 | if (trace && ((cond_id & 15) != 14)) | |
356 | printf ("cond[%d] %s = %s\n", cond_id, cond_name[cond_id & 15], | |
357 | f ? "true" : "false"); | |
358 | return f; | |
359 | } | |
360 | ||
361 | void | |
362 | set_flags (int mask, int newbits) | |
363 | { | |
364 | regs.r_psw &= rx_flagand; | |
365 | regs.r_psw |= rx_flagor; | |
366 | regs.r_psw |= (newbits & mask & rx_flagmask); | |
367 | ||
368 | if (trace) | |
369 | { | |
370 | int i; | |
371 | printf ("flags now \033[32m %d", (int)((regs.r_psw >> 24) & 7)); | |
372 | for (i = 17; i >= 0; i--) | |
373 | if (0x3000f & (1 << i)) | |
374 | { | |
375 | if (regs.r_psw & (1 << i)) | |
376 | putchar ("CZSO------------IU"[i]); | |
377 | else | |
378 | putchar ('-'); | |
379 | } | |
380 | printf ("\033[0m\n"); | |
381 | } | |
382 | } | |
383 | ||
384 | void | |
385 | set_oszc (long long value, int b, int c) | |
386 | { | |
32b269ae | 387 | unsigned int mask = b2mask[b]; |
4f8d4a38 DD |
388 | int f = 0; |
389 | ||
390 | if (c) | |
391 | f |= FLAGBIT_C; | |
392 | if ((value & mask) == 0) | |
393 | f |= FLAGBIT_Z; | |
394 | if (value & b2signbit[b]) | |
395 | f |= FLAGBIT_S; | |
396 | if ((value > b2maxsigned[b]) || (value < b2minsigned[b])) | |
397 | f |= FLAGBIT_O; | |
398 | set_flags (FLAGBIT_Z | FLAGBIT_S | FLAGBIT_O | FLAGBIT_C, f); | |
399 | } | |
400 | ||
401 | void | |
402 | set_szc (long long value, int b, int c) | |
403 | { | |
32b269ae | 404 | unsigned int mask = b2mask[b]; |
4f8d4a38 DD |
405 | int f = 0; |
406 | ||
407 | if (c) | |
408 | f |= FLAGBIT_C; | |
409 | if ((value & mask) == 0) | |
410 | f |= FLAGBIT_Z; | |
411 | if (value & b2signbit[b]) | |
412 | f |= FLAGBIT_S; | |
413 | set_flags (FLAGBIT_Z | FLAGBIT_S | FLAGBIT_C, f); | |
414 | } | |
415 | ||
416 | void | |
417 | set_osz (long long value, int b) | |
418 | { | |
32b269ae | 419 | unsigned int mask = b2mask[b]; |
4f8d4a38 DD |
420 | int f = 0; |
421 | ||
422 | if ((value & mask) == 0) | |
423 | f |= FLAGBIT_Z; | |
424 | if (value & b2signbit[b]) | |
425 | f |= FLAGBIT_S; | |
426 | if ((value > b2maxsigned[b]) || (value < b2minsigned[b])) | |
427 | f |= FLAGBIT_O; | |
428 | set_flags (FLAGBIT_Z | FLAGBIT_S | FLAGBIT_O, f); | |
429 | } | |
430 | ||
431 | void | |
432 | set_sz (long long value, int b) | |
433 | { | |
32b269ae | 434 | unsigned int mask = b2mask[b]; |
4f8d4a38 DD |
435 | int f = 0; |
436 | ||
437 | if ((value & mask) == 0) | |
438 | f |= FLAGBIT_Z; | |
439 | if (value & b2signbit[b]) | |
440 | f |= FLAGBIT_S; | |
441 | set_flags (FLAGBIT_Z | FLAGBIT_S, f); | |
442 | } | |
443 | ||
444 | void | |
445 | set_zc (int z, int c) | |
446 | { | |
447 | set_flags (FLAGBIT_C | FLAGBIT_Z, | |
448 | (c ? FLAGBIT_C : 0) | (z ? FLAGBIT_Z : 0)); | |
449 | } | |
450 | ||
451 | void | |
452 | set_c (int c) | |
453 | { | |
454 | set_flags (FLAGBIT_C, c ? FLAGBIT_C : 0); | |
455 | } | |
456 | ||
457 | static char * | |
458 | psw2str(int rpsw) | |
459 | { | |
460 | static char buf[10]; | |
461 | char *bp = buf; | |
462 | int i, ipl; | |
463 | ||
464 | ipl = (rpsw & FLAGBITS_IPL) >> FLAGSHIFT_IPL; | |
465 | if (ipl > 9) | |
466 | { | |
467 | *bp++ = (ipl / 10) + '0'; | |
468 | ipl %= 10; | |
469 | } | |
470 | *bp++ = ipl + '0'; | |
471 | for (i = 20; i >= 0; i--) | |
472 | if (0x13000f & (1 << i)) | |
473 | { | |
474 | if (rpsw & (1 << i)) | |
475 | *bp++ = "CZSO------------IU--P"[i]; | |
476 | else | |
477 | *bp++ = '-'; | |
478 | } | |
479 | *bp = 0; | |
480 | return buf; | |
481 | } | |
482 | ||
483 | static char * | |
484 | fpsw2str(int rpsw) | |
485 | { | |
486 | static char buf[100]; | |
487 | char *bp = buf; | |
488 | int i; /* ---+---+---+---+---+---+---+---+ */ | |
489 | const char s1[] = "FFFFFF-----------EEEEE-DCCCCCCRR"; | |
490 | const char s2[] = "SXUZOV-----------XUZOV-NEXUZOV01"; | |
491 | const char rm[4][3] = { "RC", "RZ", "RP", "RN" }; | |
492 | ||
493 | for (i = 31; i >= 0; i--) | |
494 | if (0xfc007dfc & (1 << i)) | |
495 | { | |
496 | if (rpsw & (1 << i)) | |
497 | { | |
498 | if (bp > buf) | |
499 | *bp++ = '.'; | |
500 | *bp++ = s1[31-i]; | |
501 | *bp++ = s2[31-i]; | |
502 | } | |
503 | } | |
504 | if (bp > buf) | |
505 | *bp++ = '.'; | |
506 | strcpy (bp, rm[rpsw&3]); | |
507 | return buf; | |
508 | } | |
509 | ||
510 | #define TRC(f,n) \ | |
511 | if (oldregs.f != regs.f) \ | |
512 | { \ | |
b9fe9957 | 513 | if (tag) { printf ("%s", tag); tag = 0; } \ |
4f8d4a38 DD |
514 | printf(" %s %08x:%08x", n, \ |
515 | (unsigned int)oldregs.f, \ | |
516 | (unsigned int)regs.f); \ | |
517 | oldregs.f = regs.f; \ | |
518 | } | |
519 | ||
520 | void | |
521 | trace_register_changes (void) | |
522 | { | |
523 | char *tag = "\033[36mREGS:"; | |
524 | int i; | |
525 | ||
526 | if (!trace) | |
527 | return; | |
528 | for (i=1; i<16; i++) | |
529 | TRC (r[i], reg_names[i]); | |
530 | TRC (r_intb, "intb"); | |
531 | TRC (r_usp, "usp"); | |
532 | TRC (r_isp, "isp"); | |
533 | if (oldregs.r_psw != regs.r_psw) | |
534 | { | |
b9fe9957 | 535 | if (tag) { printf ("%s", tag); tag = 0; } |
4f8d4a38 DD |
536 | printf(" psw %s:", psw2str(oldregs.r_psw)); |
537 | printf("%s", psw2str(regs.r_psw)); | |
538 | oldregs.r_psw = regs.r_psw; | |
539 | } | |
540 | ||
541 | if (oldregs.r_fpsw != regs.r_fpsw) | |
542 | { | |
b9fe9957 | 543 | if (tag) { printf ("%s", tag); tag = 0; } |
4f8d4a38 DD |
544 | printf(" fpsw %s:", fpsw2str(oldregs.r_fpsw)); |
545 | printf("%s", fpsw2str(regs.r_fpsw)); | |
546 | oldregs.r_fpsw = regs.r_fpsw; | |
547 | } | |
548 | ||
549 | if (oldregs.r_acc != regs.r_acc) | |
550 | { | |
b9fe9957 | 551 | if (tag) { printf ("%s", tag); tag = 0; } |
ae41b4ce AB |
552 | printf(" acc %016" PRIx64 ":", oldregs.r_acc); |
553 | printf("%016" PRIx64, regs.r_acc); | |
4f8d4a38 DD |
554 | oldregs.r_acc = regs.r_acc; |
555 | } | |
556 | ||
557 | if (tag == 0) | |
558 | printf ("\033[0m\n"); | |
559 | } |