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1 | /* gdb-if.c -- sim interface to GDB. |
2 | ||
1d506c26 | 3 | Copyright (C) 2011-2024 Free Software Foundation, Inc. |
9058f767 KB |
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" | |
23 | ||
9058f767 KB |
24 | #include <stdio.h> |
25 | #include <assert.h> | |
26 | #include <signal.h> | |
27 | #include <string.h> | |
28 | #include <ctype.h> | |
29 | #include <stdlib.h> | |
30 | ||
31 | #include "ansidecl.h" | |
75070a4e | 32 | #include "libiberty.h" |
df68e12b MF |
33 | #include "sim/callback.h" |
34 | #include "sim/sim.h" | |
9058f767 | 35 | #include "gdb/signals.h" |
d026e67e | 36 | #include "sim/sim-rl78.h" |
9058f767 KB |
37 | |
38 | #include "cpu.h" | |
39 | #include "mem.h" | |
40 | #include "load.h" | |
41 | #include "trace.h" | |
42 | ||
43 | /* Ideally, we'd wrap up all the minisim's data structures in an | |
44 | object and pass that around. However, neither GDB nor run needs | |
45 | that ability. | |
46 | ||
47 | So we just have one instance, that lives in global variables, and | |
48 | each time we open it, we re-initialize it. */ | |
49 | ||
50 | struct sim_state | |
51 | { | |
52 | const char *message; | |
53 | }; | |
54 | ||
55 | static struct sim_state the_minisim = { | |
56 | "This is the sole rl78 minisim instance." | |
57 | }; | |
58 | ||
9a28444f | 59 | static int is_open; |
9058f767 | 60 | |
9058f767 KB |
61 | static struct host_callback_struct *host_callbacks; |
62 | ||
63 | /* Open an instance of the sim. For this sim, only one instance | |
64 | is permitted. If sim_open() is called multiple times, the sim | |
65 | will be reset. */ | |
66 | ||
67 | SIM_DESC | |
68 | sim_open (SIM_OPEN_KIND kind, | |
69 | struct host_callback_struct *callback, | |
2e3d4f4d | 70 | struct bfd *abfd, char * const *argv) |
9058f767 | 71 | { |
9a28444f | 72 | if (is_open) |
9058f767 KB |
73 | fprintf (stderr, "rl78 minisim: re-opened sim\n"); |
74 | ||
75 | /* The 'run' interface doesn't use this function, so we don't care | |
76 | about KIND; it's always SIM_OPEN_DEBUG. */ | |
77 | if (kind != SIM_OPEN_DEBUG) | |
78 | fprintf (stderr, "rl78 minisim: sim_open KIND != SIM_OPEN_DEBUG: %d\n", | |
79 | kind); | |
80 | ||
81 | /* We use this for the load command. Perhaps someday, it'll be used | |
82 | for syscalls too. */ | |
83 | host_callbacks = callback; | |
84 | ||
85 | /* We don't expect any command-line arguments. */ | |
86 | ||
87 | init_cpu (); | |
88 | trace = 0; | |
89 | ||
90 | sim_disasm_init (abfd); | |
9a28444f | 91 | is_open = 1; |
0952813b DD |
92 | |
93 | while (argv != NULL && *argv != NULL) | |
94 | { | |
95 | if (strcmp (*argv, "g10") == 0 || strcmp (*argv, "-Mg10") == 0) | |
96 | { | |
97 | fprintf (stderr, "rl78 g10 support enabled.\n"); | |
98 | rl78_g10_mode = 1; | |
99 | g13_multiply = 0; | |
100 | g14_multiply = 0; | |
101 | mem_set_mirror (0, 0xf8000, 4096); | |
102 | break; | |
103 | } | |
104 | if (strcmp (*argv, "g13") == 0 || strcmp (*argv, "-Mg13") == 0) | |
105 | { | |
106 | fprintf (stderr, "rl78 g13 support enabled.\n"); | |
107 | rl78_g10_mode = 0; | |
108 | g13_multiply = 1; | |
109 | g14_multiply = 0; | |
110 | break; | |
111 | } | |
112 | if (strcmp (*argv, "g14") == 0 || strcmp (*argv, "-Mg14") == 0) | |
113 | { | |
114 | fprintf (stderr, "rl78 g14 support enabled.\n"); | |
115 | rl78_g10_mode = 0; | |
116 | g13_multiply = 0; | |
117 | g14_multiply = 1; | |
118 | break; | |
119 | } | |
120 | argv++; | |
121 | } | |
122 | ||
9058f767 KB |
123 | return &the_minisim; |
124 | } | |
125 | ||
126 | /* Verify the sim descriptor. Just print a message if the descriptor | |
127 | doesn't match. Nothing bad will happen if the descriptor doesn't | |
128 | match because all of the state is global. But if it doesn't | |
129 | match, that means there's a problem with the caller. */ | |
130 | ||
131 | static void | |
132 | check_desc (SIM_DESC sd) | |
133 | { | |
134 | if (sd != &the_minisim) | |
135 | fprintf (stderr, "rl78 minisim: desc != &the_minisim\n"); | |
136 | } | |
137 | ||
138 | /* Close the sim. */ | |
139 | ||
140 | void | |
141 | sim_close (SIM_DESC sd, int quitting) | |
142 | { | |
143 | check_desc (sd); | |
144 | ||
145 | /* Not much to do. At least free up our memory. */ | |
146 | init_mem (); | |
147 | ||
9a28444f | 148 | is_open = 0; |
9058f767 KB |
149 | } |
150 | ||
151 | /* Open the program to run; print a message if the program cannot | |
152 | be opened. */ | |
153 | ||
154 | static bfd * | |
155 | open_objfile (const char *filename) | |
156 | { | |
157 | bfd *prog = bfd_openr (filename, 0); | |
158 | ||
159 | if (!prog) | |
160 | { | |
161 | fprintf (stderr, "Can't read %s\n", filename); | |
162 | return 0; | |
163 | } | |
164 | ||
165 | if (!bfd_check_format (prog, bfd_object)) | |
166 | { | |
167 | fprintf (stderr, "%s not a rl78 program\n", filename); | |
168 | return 0; | |
169 | } | |
170 | ||
171 | return prog; | |
172 | } | |
173 | ||
174 | /* Load a program. */ | |
175 | ||
176 | SIM_RC | |
b2b255bd | 177 | sim_load (SIM_DESC sd, const char *prog, struct bfd *abfd, int from_tty) |
9058f767 KB |
178 | { |
179 | check_desc (sd); | |
180 | ||
181 | if (!abfd) | |
182 | abfd = open_objfile (prog); | |
183 | if (!abfd) | |
184 | return SIM_RC_FAIL; | |
185 | ||
186 | rl78_load (abfd, host_callbacks, "sim"); | |
187 | ||
188 | return SIM_RC_OK; | |
189 | } | |
190 | ||
191 | /* Create inferior. */ | |
192 | ||
193 | SIM_RC | |
2e3d4f4d MF |
194 | sim_create_inferior (SIM_DESC sd, struct bfd *abfd, |
195 | char * const *argv, char * const *env) | |
9058f767 KB |
196 | { |
197 | check_desc (sd); | |
198 | ||
199 | if (abfd) | |
200 | rl78_load (abfd, 0, "sim"); | |
201 | ||
202 | return SIM_RC_OK; | |
203 | } | |
204 | ||
205 | /* Read memory. */ | |
206 | ||
63fd5b5d | 207 | uint64_t |
cbbcd7fd | 208 | sim_read (SIM_DESC sd, uint64_t addr, void *buf, uint64_t length) |
9058f767 KB |
209 | { |
210 | check_desc (sd); | |
211 | ||
cbbcd7fd | 212 | if (addr >= MEM_SIZE) |
9058f767 | 213 | return 0; |
cbbcd7fd MW |
214 | else if (addr + length > MEM_SIZE) |
215 | length = MEM_SIZE - addr; | |
9058f767 | 216 | |
cbbcd7fd | 217 | mem_get_blk (addr, buf, length); |
9058f767 KB |
218 | return length; |
219 | } | |
220 | ||
221 | /* Write memory. */ | |
222 | ||
63fd5b5d | 223 | uint64_t |
cbbcd7fd | 224 | sim_write (SIM_DESC sd, uint64_t addr, const void *buf, uint64_t length) |
9058f767 KB |
225 | { |
226 | check_desc (sd); | |
227 | ||
cbbcd7fd | 228 | if (addr >= MEM_SIZE) |
9058f767 | 229 | return 0; |
cbbcd7fd MW |
230 | else if (addr + length > MEM_SIZE) |
231 | length = MEM_SIZE - addr; | |
9058f767 | 232 | |
cbbcd7fd | 233 | mem_put_blk (addr, buf, length); |
9058f767 KB |
234 | return length; |
235 | } | |
236 | ||
237 | /* Read the LENGTH bytes at BUF as an little-endian value. */ | |
238 | ||
239 | static SI | |
ed60d3ed | 240 | get_le (const unsigned char *buf, int length) |
9058f767 KB |
241 | { |
242 | SI acc = 0; | |
243 | ||
244 | while (--length >= 0) | |
245 | acc = (acc << 8) + buf[length]; | |
246 | ||
247 | return acc; | |
248 | } | |
249 | ||
250 | /* Store VAL as a little-endian value in the LENGTH bytes at BUF. */ | |
251 | ||
252 | static void | |
253 | put_le (unsigned char *buf, int length, SI val) | |
254 | { | |
255 | int i; | |
256 | ||
257 | for (i = 0; i < length; i++) | |
258 | { | |
259 | buf[i] = val & 0xff; | |
260 | val >>= 8; | |
261 | } | |
262 | } | |
263 | ||
264 | /* Verify that REGNO is in the proper range. Return 0 if not and | |
265 | something non-zero if so. */ | |
266 | ||
267 | static int | |
268 | check_regno (enum sim_rl78_regnum regno) | |
269 | { | |
270 | return 0 <= regno && regno < sim_rl78_num_regs; | |
271 | } | |
272 | ||
273 | /* Return the size of the register REGNO. */ | |
274 | ||
275 | static size_t | |
276 | reg_size (enum sim_rl78_regnum regno) | |
277 | { | |
278 | size_t size; | |
279 | ||
280 | if (regno == sim_rl78_pc_regnum) | |
281 | size = 4; | |
282 | else | |
283 | size = 1; | |
284 | ||
285 | return size; | |
286 | } | |
287 | ||
288 | /* Return the register address associated with the register specified by | |
289 | REGNO. */ | |
290 | ||
291 | static unsigned long | |
292 | reg_addr (enum sim_rl78_regnum regno) | |
293 | { | |
294 | if (sim_rl78_bank0_r0_regnum <= regno | |
295 | && regno <= sim_rl78_bank0_r7_regnum) | |
296 | return 0xffef8 + (regno - sim_rl78_bank0_r0_regnum); | |
297 | else if (sim_rl78_bank1_r0_regnum <= regno | |
298 | && regno <= sim_rl78_bank1_r7_regnum) | |
299 | return 0xffef0 + (regno - sim_rl78_bank1_r0_regnum); | |
300 | else if (sim_rl78_bank2_r0_regnum <= regno | |
301 | && regno <= sim_rl78_bank2_r7_regnum) | |
302 | return 0xffee8 + (regno - sim_rl78_bank2_r0_regnum); | |
303 | else if (sim_rl78_bank3_r0_regnum <= regno | |
304 | && regno <= sim_rl78_bank3_r7_regnum) | |
305 | return 0xffee0 + (regno - sim_rl78_bank3_r0_regnum); | |
306 | else if (regno == sim_rl78_psw_regnum) | |
307 | return 0xffffa; | |
308 | else if (regno == sim_rl78_es_regnum) | |
309 | return 0xffffd; | |
310 | else if (regno == sim_rl78_cs_regnum) | |
311 | return 0xffffc; | |
312 | /* Note: We can't handle PC here because it's not memory mapped. */ | |
313 | else if (regno == sim_rl78_spl_regnum) | |
314 | return 0xffff8; | |
315 | else if (regno == sim_rl78_sph_regnum) | |
316 | return 0xffff9; | |
317 | else if (regno == sim_rl78_pmc_regnum) | |
318 | return 0xffffe; | |
319 | else if (regno == sim_rl78_mem_regnum) | |
320 | return 0xfffff; | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
325 | /* Fetch the contents of the register specified by REGNO, placing the | |
326 | contents in BUF. The length LENGTH must match the sim's internal | |
327 | notion of the register's size. */ | |
328 | ||
329 | int | |
ee1cffd3 | 330 | sim_fetch_register (SIM_DESC sd, int regno, void *buf, int length) |
9058f767 KB |
331 | { |
332 | size_t size; | |
333 | SI val; | |
334 | ||
335 | check_desc (sd); | |
336 | ||
337 | if (!check_regno (regno)) | |
338 | return 0; | |
339 | ||
340 | size = reg_size (regno); | |
341 | ||
342 | if (length != size) | |
343 | return 0; | |
344 | ||
345 | if (regno == sim_rl78_pc_regnum) | |
346 | val = pc; | |
347 | else | |
348 | val = memory[reg_addr (regno)]; | |
349 | ||
350 | put_le (buf, length, val); | |
351 | ||
352 | return size; | |
353 | } | |
354 | ||
355 | /* Store the value stored in BUF to the register REGNO. The length | |
356 | LENGTH must match the sim's internal notion of the register size. */ | |
357 | ||
358 | int | |
ee1cffd3 | 359 | sim_store_register (SIM_DESC sd, int regno, const void *buf, int length) |
9058f767 KB |
360 | { |
361 | size_t size; | |
362 | SI val; | |
363 | ||
364 | check_desc (sd); | |
365 | ||
366 | if (!check_regno (regno)) | |
367 | return -1; | |
368 | ||
369 | size = reg_size (regno); | |
370 | ||
371 | if (length != size) | |
372 | return -1; | |
373 | ||
374 | val = get_le (buf, length); | |
375 | ||
376 | if (regno == sim_rl78_pc_regnum) | |
317cc67d KB |
377 | { |
378 | pc = val; | |
379 | ||
380 | /* The rl78 program counter is 20 bits wide. Ensure that GDB | |
381 | hasn't picked up any stray bits. This has occurred when performing | |
382 | a GDB "return" command in which the return address is obtained | |
383 | from a 32-bit container on the stack. */ | |
384 | assert ((pc & ~0x0fffff) == 0); | |
385 | } | |
9058f767 KB |
386 | else |
387 | memory[reg_addr (regno)] = val; | |
388 | return size; | |
389 | } | |
390 | ||
391 | /* Print out message associated with "info target". */ | |
392 | ||
393 | void | |
cc67f780 | 394 | sim_info (SIM_DESC sd, bool verbose) |
9058f767 KB |
395 | { |
396 | check_desc (sd); | |
397 | ||
398 | printf ("The rl78 minisim doesn't collect any statistics.\n"); | |
399 | } | |
400 | ||
401 | static volatile int stop; | |
402 | static enum sim_stop reason; | |
403 | int siggnal; | |
404 | ||
405 | ||
406 | /* Given a signal number used by the rl78 bsp (that is, newlib), | |
407 | return the corresponding signal numbers. */ | |
408 | ||
5318ba65 | 409 | static int |
9058f767 KB |
410 | rl78_signal_to_target (int sig) |
411 | { | |
412 | switch (sig) | |
413 | { | |
414 | case 4: | |
a493e3e2 | 415 | return GDB_SIGNAL_ILL; |
9058f767 KB |
416 | |
417 | case 5: | |
a493e3e2 | 418 | return GDB_SIGNAL_TRAP; |
9058f767 KB |
419 | |
420 | case 10: | |
a493e3e2 | 421 | return GDB_SIGNAL_BUS; |
9058f767 KB |
422 | |
423 | case 11: | |
a493e3e2 | 424 | return GDB_SIGNAL_SEGV; |
9058f767 KB |
425 | |
426 | case 24: | |
a493e3e2 | 427 | return GDB_SIGNAL_XCPU; |
9058f767 KB |
428 | break; |
429 | ||
430 | case 2: | |
a493e3e2 | 431 | return GDB_SIGNAL_INT; |
9058f767 KB |
432 | |
433 | case 8: | |
a493e3e2 | 434 | return GDB_SIGNAL_FPE; |
9058f767 KB |
435 | break; |
436 | ||
437 | case 6: | |
a493e3e2 | 438 | return GDB_SIGNAL_ABRT; |
9058f767 KB |
439 | } |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
444 | ||
445 | /* Take a step return code RC and set up the variables consulted by | |
446 | sim_stop_reason appropriately. */ | |
447 | ||
5318ba65 | 448 | static void |
9058f767 KB |
449 | handle_step (int rc) |
450 | { | |
451 | if (RL78_STEPPED (rc) || RL78_HIT_BREAK (rc)) | |
452 | { | |
453 | reason = sim_stopped; | |
a493e3e2 | 454 | siggnal = GDB_SIGNAL_TRAP; |
9058f767 KB |
455 | } |
456 | else if (RL78_STOPPED (rc)) | |
457 | { | |
458 | reason = sim_stopped; | |
459 | siggnal = rl78_signal_to_target (RL78_STOP_SIG (rc)); | |
460 | } | |
461 | else | |
462 | { | |
463 | assert (RL78_EXITED (rc)); | |
464 | reason = sim_exited; | |
465 | siggnal = RL78_EXIT_STATUS (rc); | |
466 | } | |
467 | } | |
468 | ||
469 | ||
470 | /* Resume execution after a stop. */ | |
471 | ||
472 | void | |
473 | sim_resume (SIM_DESC sd, int step, int sig_to_deliver) | |
474 | { | |
475 | int rc; | |
476 | ||
477 | check_desc (sd); | |
478 | ||
479 | if (sig_to_deliver != 0) | |
480 | { | |
481 | fprintf (stderr, | |
482 | "Warning: the rl78 minisim does not implement " | |
483 | "signal delivery yet.\n" "Resuming with no signal.\n"); | |
484 | } | |
485 | ||
486 | /* We don't clear 'stop' here, because then we would miss | |
487 | interrupts that arrived on the way here. Instead, we clear | |
488 | the flag in sim_stop_reason, after GDB has disabled the | |
489 | interrupt signal handler. */ | |
490 | for (;;) | |
491 | { | |
492 | if (stop) | |
493 | { | |
494 | stop = 0; | |
495 | reason = sim_stopped; | |
a493e3e2 | 496 | siggnal = GDB_SIGNAL_INT; |
9058f767 KB |
497 | break; |
498 | } | |
499 | ||
9058f767 KB |
500 | rc = setjmp (decode_jmp_buf); |
501 | if (rc == 0) | |
502 | rc = decode_opcode (); | |
503 | ||
504 | if (!RL78_STEPPED (rc) || step) | |
505 | { | |
506 | handle_step (rc); | |
507 | break; | |
508 | } | |
509 | } | |
510 | } | |
511 | ||
512 | /* Stop the sim. */ | |
513 | ||
514 | int | |
515 | sim_stop (SIM_DESC sd) | |
516 | { | |
517 | stop = 1; | |
518 | ||
519 | return 1; | |
520 | } | |
521 | ||
522 | /* Fetch the stop reason and signal. */ | |
523 | ||
524 | void | |
525 | sim_stop_reason (SIM_DESC sd, enum sim_stop *reason_p, int *sigrc_p) | |
526 | { | |
527 | check_desc (sd); | |
528 | ||
529 | *reason_p = reason; | |
530 | *sigrc_p = siggnal; | |
531 | } | |
532 | ||
533 | /* Execute the sim-specific command associated with GDB's "sim ..." | |
534 | command. */ | |
535 | ||
536 | void | |
60d847df | 537 | sim_do_command (SIM_DESC sd, const char *cmd) |
9058f767 | 538 | { |
75070a4e MF |
539 | const char *arg; |
540 | char **argv = buildargv (cmd); | |
9058f767 KB |
541 | |
542 | check_desc (sd); | |
543 | ||
75070a4e MF |
544 | cmd = arg = ""; |
545 | if (argv != NULL) | |
9058f767 | 546 | { |
75070a4e MF |
547 | if (argv[0] != NULL) |
548 | cmd = argv[0]; | |
549 | if (argv[1] != NULL) | |
550 | arg = argv[1]; | |
9058f767 KB |
551 | } |
552 | ||
553 | if (strcmp (cmd, "trace") == 0) | |
554 | { | |
75070a4e | 555 | if (strcmp (arg, "on") == 0) |
9058f767 | 556 | trace = 1; |
75070a4e | 557 | else if (strcmp (arg, "off") == 0) |
9058f767 KB |
558 | trace = 0; |
559 | else | |
560 | printf ("The 'sim trace' command expects 'on' or 'off' " | |
561 | "as an argument.\n"); | |
562 | } | |
563 | else if (strcmp (cmd, "verbose") == 0) | |
564 | { | |
75070a4e | 565 | if (strcmp (arg, "on") == 0) |
9058f767 | 566 | verbose = 1; |
75070a4e | 567 | else if (strcmp (arg, "noisy") == 0) |
9058f767 | 568 | verbose = 2; |
75070a4e | 569 | else if (strcmp (arg, "off") == 0) |
9058f767 KB |
570 | verbose = 0; |
571 | else | |
572 | printf ("The 'sim verbose' command expects 'on', 'noisy', or 'off'" | |
573 | " as an argument.\n"); | |
574 | } | |
575 | else | |
576 | printf ("The 'sim' command expects either 'trace' or 'verbose'" | |
577 | " as a subcommand.\n"); | |
60d847df | 578 | |
75070a4e | 579 | freeargv (argv); |
9058f767 KB |
580 | } |
581 | ||
582 | /* Stub for command completion. */ | |
583 | ||
584 | char ** | |
3cb2ab1a | 585 | sim_complete_command (SIM_DESC sd, const char *text, const char *word) |
9058f767 KB |
586 | { |
587 | return NULL; | |
588 | } | |
7a9bd3b4 MF |
589 | |
590 | char * | |
591 | sim_memory_map (SIM_DESC sd) | |
592 | { | |
593 | return NULL; | |
594 | } |