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c906108c | 1 | /* Generic simulator watchpoint support. |
3666a048 | 2 | Copyright (C) 1997-2021 Free Software Foundation, Inc. |
c906108c SS |
3 | Contributed by Cygnus Support. |
4 | ||
5 | This file is part of GDB, the GNU debugger. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
4744ac1b JB |
9 | the Free Software Foundation; either version 3 of the License, or |
10 | (at your option) any later version. | |
c906108c SS |
11 | |
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
4744ac1b JB |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
c906108c | 19 | |
b6061d4d | 20 | #include "config.h" |
c906108c SS |
21 | #include "sim-main.h" |
22 | #include "sim-options.h" | |
f074c07d | 23 | #include "libiberty.h" |
c906108c SS |
24 | |
25 | #include "sim-assert.h" | |
26 | ||
27 | #include <ctype.h> | |
b6061d4d | 28 | #include <stdio.h> |
c906108c | 29 | #include <string.h> |
c906108c | 30 | #include <stdlib.h> |
c906108c SS |
31 | |
32 | enum { | |
33 | OPTION_WATCH_DELETE = OPTION_START, | |
34 | ||
35 | OPTION_WATCH_INFO, | |
36 | OPTION_WATCH_CLOCK, | |
37 | OPTION_WATCH_CYCLES, | |
38 | OPTION_WATCH_PC, | |
39 | ||
40 | OPTION_WATCH_OP, | |
41 | }; | |
42 | ||
43 | ||
44 | /* Break an option number into its op/int-nr */ | |
45 | static watchpoint_type | |
46 | option_to_type (SIM_DESC sd, | |
47 | int option) | |
48 | { | |
49 | sim_watchpoints *watch = STATE_WATCHPOINTS (sd); | |
50 | watchpoint_type type = ((option - OPTION_WATCH_OP) | |
51 | / (watch->nr_interrupts + 1)); | |
52 | SIM_ASSERT (type >= 0 && type < nr_watchpoint_types); | |
53 | return type; | |
54 | } | |
55 | ||
56 | static int | |
57 | option_to_interrupt_nr (SIM_DESC sd, | |
58 | int option) | |
59 | { | |
60 | sim_watchpoints *watch = STATE_WATCHPOINTS (sd); | |
61 | int interrupt_nr = ((option - OPTION_WATCH_OP) | |
62 | % (watch->nr_interrupts + 1)); | |
63 | return interrupt_nr; | |
64 | } | |
65 | ||
66 | static int | |
67 | type_to_option (SIM_DESC sd, | |
68 | watchpoint_type type, | |
69 | int interrupt_nr) | |
70 | { | |
71 | sim_watchpoints *watch = STATE_WATCHPOINTS (sd); | |
72 | return ((type * (watch->nr_interrupts + 1)) | |
73 | + interrupt_nr | |
74 | + OPTION_WATCH_OP); | |
75 | } | |
76 | ||
77 | ||
78 | /* Delete one or more watchpoints. Fail if no watchpoints were found */ | |
79 | ||
80 | static SIM_RC | |
81 | do_watchpoint_delete (SIM_DESC sd, | |
82 | int ident, | |
83 | watchpoint_type type) | |
84 | { | |
85 | sim_watchpoints *watch = STATE_WATCHPOINTS (sd); | |
86 | sim_watch_point **entry = &watch->points; | |
87 | SIM_RC status = SIM_RC_FAIL; | |
88 | while ((*entry) != NULL) | |
89 | { | |
90 | if ((*entry)->ident == ident | |
91 | || (*entry)->type == type) | |
92 | { | |
93 | sim_watch_point *dead = (*entry); | |
94 | (*entry) = (*entry)->next; | |
95 | sim_events_deschedule (sd, dead->event); | |
d79fe0d6 | 96 | free (dead); |
c906108c SS |
97 | status = SIM_RC_OK; |
98 | } | |
99 | else | |
100 | entry = &(*entry)->next; | |
101 | } | |
102 | return status; | |
103 | } | |
104 | ||
ff398ee4 | 105 | static const char * |
c906108c SS |
106 | watchpoint_type_to_str (SIM_DESC sd, |
107 | watchpoint_type type) | |
108 | { | |
109 | switch (type) | |
110 | { | |
111 | case pc_watchpoint: | |
112 | return "pc"; | |
113 | case clock_watchpoint: | |
114 | return "clock"; | |
115 | case cycles_watchpoint: | |
116 | return "cycles"; | |
117 | case invalid_watchpoint: | |
118 | case nr_watchpoint_types: | |
119 | return "(invalid-type)"; | |
120 | } | |
121 | return NULL; | |
122 | } | |
123 | ||
ff398ee4 | 124 | static const char * |
c906108c SS |
125 | interrupt_nr_to_str (SIM_DESC sd, |
126 | int interrupt_nr) | |
127 | { | |
128 | sim_watchpoints *watch = STATE_WATCHPOINTS (sd); | |
129 | if (interrupt_nr < 0) | |
130 | return "(invalid-interrupt)"; | |
131 | else if (interrupt_nr >= watch->nr_interrupts) | |
132 | return "breakpoint"; | |
133 | else | |
134 | return watch->interrupt_names[interrupt_nr]; | |
135 | } | |
136 | ||
137 | ||
138 | static void | |
139 | do_watchpoint_info (SIM_DESC sd) | |
140 | { | |
141 | sim_watchpoints *watch = STATE_WATCHPOINTS (sd); | |
142 | sim_watch_point *point; | |
143 | sim_io_printf (sd, "Watchpoints:\n"); | |
144 | for (point = watch->points; point != NULL; point = point->next) | |
145 | { | |
146 | sim_io_printf (sd, "%3d: watch %s %s ", | |
147 | point->ident, | |
148 | watchpoint_type_to_str (sd, point->type), | |
149 | interrupt_nr_to_str (sd, point->interrupt_nr)); | |
150 | if (point->is_periodic) | |
151 | sim_io_printf (sd, "+"); | |
152 | if (!point->is_within) | |
153 | sim_io_printf (sd, "!"); | |
154 | sim_io_printf (sd, "0x%lx", point->arg0); | |
155 | if (point->arg1 != point->arg0) | |
156 | sim_io_printf (sd, ",0x%lx", point->arg1); | |
157 | sim_io_printf (sd, "\n"); | |
158 | } | |
159 | } | |
028f6515 | 160 | |
c906108c SS |
161 | |
162 | ||
163 | static sim_event_handler handle_watchpoint; | |
164 | ||
165 | static SIM_RC | |
166 | schedule_watchpoint (SIM_DESC sd, | |
167 | sim_watch_point *point) | |
168 | { | |
169 | sim_watchpoints *watch = STATE_WATCHPOINTS (sd); | |
170 | switch (point->type) | |
171 | { | |
172 | case pc_watchpoint: | |
173 | point->event = sim_events_watch_sim (sd, | |
174 | watch->pc, | |
175 | watch->sizeof_pc, | |
176 | 0/* host-endian */, | |
177 | point->is_within, | |
178 | point->arg0, point->arg1, | |
179 | /* PC in arg0..arg1 */ | |
180 | handle_watchpoint, | |
181 | point); | |
182 | return SIM_RC_OK; | |
183 | case clock_watchpoint: | |
184 | point->event = sim_events_watch_clock (sd, | |
185 | point->arg0, /* ms time */ | |
186 | handle_watchpoint, | |
187 | point); | |
188 | return SIM_RC_OK; | |
189 | case cycles_watchpoint: | |
190 | point->event = sim_events_schedule (sd, | |
191 | point->arg0, /* time */ | |
192 | handle_watchpoint, | |
193 | point); | |
194 | return SIM_RC_OK; | |
195 | default: | |
196 | sim_engine_abort (sd, NULL, NULL_CIA, | |
197 | "handle_watchpoint - internal error - bad switch"); | |
198 | return SIM_RC_FAIL; | |
199 | } | |
200 | return SIM_RC_OK; | |
201 | } | |
202 | ||
203 | ||
204 | static void | |
205 | handle_watchpoint (SIM_DESC sd, void *data) | |
206 | { | |
207 | sim_watchpoints *watch = STATE_WATCHPOINTS (sd); | |
208 | sim_watch_point *point = (sim_watch_point *) data; | |
209 | int interrupt_nr = point->interrupt_nr; | |
210 | ||
211 | if (point->is_periodic) | |
212 | /* reschedule this event before processing it */ | |
213 | schedule_watchpoint (sd, point); | |
214 | else | |
215 | do_watchpoint_delete (sd, point->ident, invalid_watchpoint); | |
028f6515 | 216 | |
c906108c SS |
217 | if (point->interrupt_nr == watch->nr_interrupts) |
218 | sim_engine_halt (sd, NULL, NULL, NULL_CIA, sim_stopped, SIM_SIGINT); | |
219 | else | |
220 | watch->interrupt_handler (sd, &watch->interrupt_names[interrupt_nr]); | |
221 | } | |
222 | ||
223 | ||
224 | static SIM_RC | |
225 | do_watchpoint_create (SIM_DESC sd, | |
226 | watchpoint_type type, | |
227 | int opt, | |
228 | char *arg) | |
229 | { | |
230 | sim_watchpoints *watch = STATE_WATCHPOINTS (sd); | |
231 | sim_watch_point **point; | |
232 | ||
233 | /* create the watchpoint */ | |
234 | point = &watch->points; | |
235 | while ((*point) != NULL) | |
236 | point = &(*point)->next; | |
237 | (*point) = ZALLOC (sim_watch_point); | |
238 | ||
239 | /* fill in the details */ | |
240 | (*point)->ident = ++(watch->last_point_nr); | |
241 | (*point)->type = option_to_type (sd, opt); | |
242 | (*point)->interrupt_nr = option_to_interrupt_nr (sd, opt); | |
243 | /* prefixes to arg - +== periodic, !==not or outside */ | |
244 | (*point)->is_within = 1; | |
245 | while (1) | |
246 | { | |
247 | if (arg[0] == '+') | |
248 | (*point)->is_periodic = 1; | |
249 | else if (arg[0] == '!') | |
250 | (*point)->is_within = 0; | |
251 | else | |
252 | break; | |
253 | arg++; | |
254 | } | |
028f6515 | 255 | |
c906108c SS |
256 | (*point)->arg0 = strtoul (arg, &arg, 0); |
257 | if (arg[0] == ',') | |
258 | (*point)->arg0 = strtoul (arg, NULL, 0); | |
259 | else | |
260 | (*point)->arg1 = (*point)->arg0; | |
261 | ||
262 | /* schedule it */ | |
263 | schedule_watchpoint (sd, (*point)); | |
264 | ||
265 | return SIM_RC_OK; | |
266 | } | |
267 | ||
268 | ||
269 | static SIM_RC | |
270 | watchpoint_option_handler (SIM_DESC sd, sim_cpu *cpu, int opt, | |
271 | char *arg, int is_command) | |
272 | { | |
273 | if (opt >= OPTION_WATCH_OP) | |
274 | return do_watchpoint_create (sd, clock_watchpoint, opt, arg); | |
275 | else | |
276 | switch (opt) | |
277 | { | |
028f6515 | 278 | |
c906108c SS |
279 | case OPTION_WATCH_DELETE: |
280 | if (isdigit ((int) arg[0])) | |
281 | { | |
282 | int ident = strtol (arg, NULL, 0); | |
283 | if (do_watchpoint_delete (sd, ident, invalid_watchpoint) | |
284 | != SIM_RC_OK) | |
285 | { | |
286 | sim_io_eprintf (sd, "Watchpoint %d not found\n", ident); | |
287 | return SIM_RC_FAIL; | |
288 | } | |
289 | return SIM_RC_OK; | |
290 | } | |
291 | else if (strcasecmp (arg, "all") == 0) | |
292 | { | |
293 | watchpoint_type type; | |
294 | for (type = invalid_watchpoint + 1; | |
295 | type < nr_watchpoint_types; | |
296 | type++) | |
297 | { | |
298 | do_watchpoint_delete (sd, 0, type); | |
299 | } | |
300 | return SIM_RC_OK; | |
301 | } | |
302 | else if (strcasecmp (arg, "pc") == 0) | |
303 | { | |
304 | if (do_watchpoint_delete (sd, 0, pc_watchpoint) | |
305 | != SIM_RC_OK) | |
306 | { | |
307 | sim_io_eprintf (sd, "No PC watchpoints found\n"); | |
308 | return SIM_RC_FAIL; | |
309 | } | |
310 | return SIM_RC_OK; | |
311 | } | |
312 | else if (strcasecmp (arg, "clock") == 0) | |
313 | { | |
314 | if (do_watchpoint_delete (sd, 0, clock_watchpoint) != SIM_RC_OK) | |
315 | { | |
316 | sim_io_eprintf (sd, "No CLOCK watchpoints found\n"); | |
317 | return SIM_RC_FAIL; | |
318 | } | |
319 | return SIM_RC_OK; | |
320 | } | |
321 | else if (strcasecmp (arg, "cycles") == 0) | |
322 | { | |
323 | if (do_watchpoint_delete (sd, 0, cycles_watchpoint) != SIM_RC_OK) | |
324 | { | |
325 | sim_io_eprintf (sd, "No CYCLES watchpoints found\n"); | |
326 | return SIM_RC_FAIL; | |
327 | } | |
328 | return SIM_RC_OK; | |
329 | } | |
330 | sim_io_eprintf (sd, "Unknown watchpoint type `%s'\n", arg); | |
331 | return SIM_RC_FAIL; | |
028f6515 | 332 | |
c906108c SS |
333 | case OPTION_WATCH_INFO: |
334 | { | |
335 | do_watchpoint_info (sd); | |
336 | return SIM_RC_OK; | |
337 | } | |
028f6515 | 338 | |
c906108c SS |
339 | default: |
340 | sim_io_eprintf (sd, "Unknown watch option %d\n", opt); | |
341 | return SIM_RC_FAIL; | |
028f6515 | 342 | |
c906108c | 343 | } |
028f6515 | 344 | |
c906108c SS |
345 | } |
346 | ||
347 | ||
348 | static SIM_RC | |
349 | sim_watchpoint_init (SIM_DESC sd) | |
350 | { | |
351 | sim_watchpoints *watch = STATE_WATCHPOINTS (sd); | |
352 | sim_watch_point *point; | |
353 | /* NOTE: Do not need to de-schedule any previous watchpoints as | |
354 | sim-events has already done this */ | |
355 | /* schedule any watchpoints enabled by command line options */ | |
356 | for (point = watch->points; point != NULL; point = point->next) | |
357 | { | |
358 | schedule_watchpoint (sd, point); | |
359 | } | |
360 | return SIM_RC_OK; | |
361 | } | |
362 | ||
363 | ||
364 | static const OPTION watchpoint_options[] = | |
365 | { | |
366 | { {"watch-delete", required_argument, NULL, OPTION_WATCH_DELETE }, | |
367 | '\0', "IDENT|all|pc|cycles|clock", "Delete a watchpoint", | |
21cf617c | 368 | watchpoint_option_handler, NULL }, |
c906108c SS |
369 | |
370 | { {"watch-info", no_argument, NULL, OPTION_WATCH_INFO }, | |
371 | '\0', NULL, "List scheduled watchpoints", | |
21cf617c | 372 | watchpoint_option_handler, NULL }, |
c906108c | 373 | |
21cf617c | 374 | { {NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL, NULL } |
c906108c SS |
375 | }; |
376 | ||
ff398ee4 | 377 | static const char *default_interrupt_names[] = { "int", 0, }; |
c906108c SS |
378 | |
379 | ||
380 | ||
381 | SIM_RC | |
382 | sim_watchpoint_install (SIM_DESC sd) | |
383 | { | |
384 | sim_watchpoints *watch = STATE_WATCHPOINTS (sd); | |
385 | SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER); | |
386 | /* the basic command set */ | |
387 | sim_module_add_init_fn (sd, sim_watchpoint_init); | |
388 | sim_add_option_table (sd, NULL, watchpoint_options); | |
389 | /* fill in some details */ | |
390 | if (watch->interrupt_names == NULL) | |
391 | watch->interrupt_names = default_interrupt_names; | |
392 | watch->nr_interrupts = 0; | |
393 | while (watch->interrupt_names[watch->nr_interrupts] != NULL) | |
394 | watch->nr_interrupts++; | |
395 | /* generate more advansed commands */ | |
396 | { | |
397 | OPTION *int_options = NZALLOC (OPTION, 1 + (watch->nr_interrupts + 1) * nr_watchpoint_types); | |
398 | int interrupt_nr; | |
399 | for (interrupt_nr = 0; interrupt_nr <= watch->nr_interrupts; interrupt_nr++) | |
400 | { | |
401 | watchpoint_type type; | |
402 | for (type = 0; type < nr_watchpoint_types; type++) | |
403 | { | |
404 | char *name; | |
405 | int nr = interrupt_nr * nr_watchpoint_types + type; | |
406 | OPTION *option = &int_options[nr]; | |
39a3ae0a MF |
407 | if (asprintf (&name, "watch-%s-%s", |
408 | watchpoint_type_to_str (sd, type), | |
409 | interrupt_nr_to_str (sd, interrupt_nr)) < 0) | |
410 | return SIM_RC_FAIL; | |
c906108c SS |
411 | option->opt.name = name; |
412 | option->opt.has_arg = required_argument; | |
413 | option->opt.val = type_to_option (sd, type, interrupt_nr); | |
414 | option->doc = ""; | |
415 | option->doc_name = ""; | |
416 | option->handler = watchpoint_option_handler; | |
417 | } | |
418 | } | |
419 | /* adjust first few entries so that they contain real | |
420 | documentation, the first entry includes a list of actions. */ | |
421 | { | |
ff398ee4 | 422 | const char *prefix = |
c906108c SS |
423 | "Watch the simulator, take ACTION in COUNT cycles (`+' for every COUNT cycles), ACTION is"; |
424 | char *doc; | |
425 | int len = strlen (prefix) + 1; | |
426 | for (interrupt_nr = 0; interrupt_nr <= watch->nr_interrupts; interrupt_nr++) | |
427 | len += strlen (interrupt_nr_to_str (sd, interrupt_nr)) + 1; | |
428 | doc = NZALLOC (char, len); | |
429 | strcpy (doc, prefix); | |
430 | for (interrupt_nr = 0; interrupt_nr <= watch->nr_interrupts; interrupt_nr++) | |
431 | { | |
432 | strcat (doc, " "); | |
433 | strcat (doc, interrupt_nr_to_str (sd, interrupt_nr)); | |
434 | } | |
435 | int_options[0].doc_name = "watch-cycles-ACTION"; | |
436 | int_options[0].arg = "[+]COUNT"; | |
437 | int_options[0].doc = doc; | |
438 | } | |
439 | int_options[1].doc_name = "watch-pc-ACTION"; | |
440 | int_options[1].arg = "[!]ADDRESS"; | |
441 | int_options[1].doc = | |
442 | "Watch the PC, take ACTION when matches ADDRESS (in range ADDRESS,ADDRESS), `!' negates test"; | |
443 | int_options[2].doc_name = "watch-clock-ACTION"; | |
444 | int_options[2].arg = "[+]MILLISECONDS"; | |
445 | int_options[2].doc = | |
446 | "Watch the clock, take ACTION after MILLISECONDS (`+' for every MILLISECONDS)"; | |
447 | ||
448 | sim_add_option_table (sd, NULL, int_options); | |
449 | } | |
450 | return SIM_RC_OK; | |
451 | } |