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eee22bf8 MK |
1 | /* Low-level child interface to ttrace. |
2 | ||
3 | Copyright 2004 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GDB. | |
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 | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
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 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #include "defs.h" | |
23 | ||
24 | /* The ttrace(2) system call didn't exist before HP-UX 10.30. Don't | |
25 | try to compile this code unless we have it. */ | |
26 | #ifdef HAVE_TTRACE | |
27 | ||
28 | #include "command.h" | |
29 | #include "gdbcore.h" | |
a7be7fa8 | 30 | #include "gdbthread.h" |
eee22bf8 MK |
31 | #include "inferior.h" |
32 | #include "observer.h" | |
33 | #include "target.h" | |
34 | ||
35 | #include "gdb_assert.h" | |
36 | #include "gdb_string.h" | |
932936f0 | 37 | #include <sys/mman.h> |
eee22bf8 MK |
38 | #include <sys/ttrace.h> |
39 | ||
40 | #include "inf-child.h" | |
41 | #include "inf-ttrace.h" | |
42 | ||
43 | /* HACK: Save the ttrace ops returned by inf_ttrace_target. */ | |
44 | static struct target_ops *ttrace_ops_hack; | |
932936f0 MK |
45 | \f |
46 | ||
a7be7fa8 MK |
47 | /* HP-UX uses a threading model where each user-space thread |
48 | corresponds to a kernel thread. These kernel threads are called | |
49 | lwps. The ttrace(2) interface gives us almost full control over | |
50 | the threads, which makes it very easy to support them in GDB. We | |
51 | identify the threads by process ID and lwp ID. The ttrace(2) also | |
52 | provides us with a thread's user ID (in the `tts_user_tid' member | |
53 | of `ttstate_t') but we don't use that (yet) as it isn't necessary | |
54 | to uniquely label the thread. */ | |
55 | ||
56 | /* Number of active lwps. */ | |
57 | static int inf_ttrace_num_lwps; | |
58 | \f | |
59 | ||
932936f0 MK |
60 | /* On HP-UX versions that have the ttrace(2) system call, we can |
61 | implement "hardware" watchpoints by fiddling with the protection of | |
62 | pages in the address space that contain the variable being watched. | |
63 | In order to implement this, we keep a dictionary of pages for which | |
64 | we have changed the protection. */ | |
65 | ||
66 | struct inf_ttrace_page | |
67 | { | |
68 | CORE_ADDR addr; /* Page address. */ | |
69 | int prot; /* Protection. */ | |
70 | int refcount; /* Reference count. */ | |
71 | struct inf_ttrace_page *next; | |
72 | struct inf_ttrace_page *prev; | |
73 | }; | |
74 | ||
75 | struct inf_ttrace_page_dict | |
76 | { | |
77 | struct inf_ttrace_page buckets[128]; | |
78 | int pagesize; /* Page size. */ | |
79 | int count; /* Number of pages in this dictionary. */ | |
80 | } inf_ttrace_page_dict; | |
81 | ||
a7be7fa8 MK |
82 | /* Number of lwps that are currently in a system call. */ |
83 | static int inf_ttrace_num_lwps_in_syscall; | |
932936f0 MK |
84 | |
85 | /* Flag to indicate whether we should re-enable page protections after | |
86 | the next wait. */ | |
87 | static int inf_ttrace_reenable_page_protections; | |
88 | ||
89 | /* Enable system call events for process PID. */ | |
90 | ||
91 | static void | |
92 | inf_ttrace_enable_syscall_events (pid_t pid) | |
93 | { | |
94 | ttevent_t tte; | |
95 | ttstate_t tts; | |
96 | ||
a7be7fa8 | 97 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); |
932936f0 MK |
98 | |
99 | if (ttrace (TT_PROC_GET_EVENT_MASK, pid, 0, | |
100 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
101 | perror_with_name ("ttrace"); | |
102 | ||
103 | tte.tte_events |= (TTEVT_SYSCALL_ENTRY | TTEVT_SYSCALL_RETURN); | |
104 | ||
105 | if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, | |
106 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
107 | perror_with_name ("ttrace"); | |
108 | ||
109 | if (ttrace (TT_PROC_GET_FIRST_LWP_STATE, pid, 0, | |
110 | (uintptr_t)&tts, sizeof tts, 0) == -1) | |
111 | perror_with_name ("ttrace"); | |
112 | ||
113 | if (tts.tts_flags & TTS_INSYSCALL) | |
a7be7fa8 | 114 | inf_ttrace_num_lwps_in_syscall++; |
932936f0 MK |
115 | |
116 | /* FIXME: Handle multiple threads. */ | |
117 | } | |
118 | ||
119 | /* Disable system call events for process PID. */ | |
120 | ||
121 | static void | |
122 | inf_ttrace_disable_syscall_events (pid_t pid) | |
123 | { | |
124 | ttevent_t tte; | |
125 | ||
126 | gdb_assert (inf_ttrace_page_dict.count == 0); | |
127 | ||
128 | if (ttrace (TT_PROC_GET_EVENT_MASK, pid, 0, | |
129 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
130 | perror_with_name ("ttrace"); | |
131 | ||
132 | tte.tte_events &= ~(TTEVT_SYSCALL_ENTRY | TTEVT_SYSCALL_RETURN); | |
133 | ||
134 | if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, | |
135 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
136 | perror_with_name ("ttrace"); | |
137 | ||
a7be7fa8 | 138 | inf_ttrace_num_lwps_in_syscall = 0; |
932936f0 MK |
139 | } |
140 | ||
141 | /* Get information about the page at address ADDR for process PID from | |
142 | the dictionary. */ | |
143 | ||
144 | static struct inf_ttrace_page * | |
145 | inf_ttrace_get_page (pid_t pid, CORE_ADDR addr) | |
146 | { | |
147 | const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets); | |
148 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
149 | int bucket; | |
150 | struct inf_ttrace_page *page; | |
151 | ||
152 | bucket = (addr / pagesize) % num_buckets; | |
153 | page = &inf_ttrace_page_dict.buckets[bucket]; | |
154 | while (page) | |
155 | { | |
156 | if (page->addr == addr) | |
157 | break; | |
158 | ||
159 | page = page->next; | |
160 | } | |
161 | ||
162 | return page; | |
163 | } | |
164 | ||
165 | /* Add the page at address ADDR for process PID to the dictionary. */ | |
166 | ||
167 | static struct inf_ttrace_page * | |
168 | inf_ttrace_add_page (pid_t pid, CORE_ADDR addr) | |
169 | { | |
170 | const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets); | |
171 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
172 | int bucket; | |
173 | struct inf_ttrace_page *page; | |
174 | struct inf_ttrace_page *prev = NULL; | |
175 | ||
176 | bucket = (addr / pagesize) % num_buckets; | |
177 | page = &inf_ttrace_page_dict.buckets[bucket]; | |
178 | while (page) | |
179 | { | |
180 | if (page->addr == addr) | |
181 | break; | |
182 | ||
183 | prev = page; | |
184 | page = page->next; | |
185 | } | |
186 | ||
187 | if (!page) | |
188 | { | |
189 | int prot; | |
190 | ||
191 | if (ttrace (TT_PROC_GET_MPROTECT, pid, 0, | |
192 | addr, 0, (uintptr_t)&prot) == -1) | |
193 | perror_with_name ("ttrace"); | |
194 | ||
195 | page = XMALLOC (struct inf_ttrace_page); | |
196 | page->addr = addr; | |
197 | page->prot = prot; | |
198 | page->refcount = 0; | |
199 | page->next = NULL; | |
200 | ||
201 | page->prev = prev; | |
202 | prev->next = page; | |
203 | ||
204 | inf_ttrace_page_dict.count++; | |
205 | if (inf_ttrace_page_dict.count == 1) | |
206 | inf_ttrace_enable_syscall_events (pid); | |
207 | ||
a7be7fa8 | 208 | if (inf_ttrace_num_lwps_in_syscall == 0) |
932936f0 MK |
209 | { |
210 | if (ttrace (TT_PROC_SET_MPROTECT, pid, 0, | |
211 | addr, pagesize, prot & ~PROT_WRITE) == -1) | |
212 | perror_with_name ("ttrace"); | |
213 | } | |
214 | } | |
215 | ||
216 | return page; | |
217 | } | |
218 | ||
219 | /* Insert the page at address ADDR of process PID to the dictionary. */ | |
220 | ||
221 | static void | |
222 | inf_ttrace_insert_page (pid_t pid, CORE_ADDR addr) | |
223 | { | |
224 | struct inf_ttrace_page *page; | |
225 | ||
226 | page = inf_ttrace_get_page (pid, addr); | |
227 | if (!page) | |
228 | page = inf_ttrace_add_page (pid, addr); | |
229 | ||
230 | page->refcount++; | |
231 | } | |
232 | ||
233 | /* Remove the page at address ADDR of process PID from the dictionary. */ | |
234 | ||
235 | static void | |
236 | inf_ttrace_remove_page (pid_t pid, CORE_ADDR addr) | |
237 | { | |
238 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
239 | struct inf_ttrace_page *page; | |
240 | ||
241 | page = inf_ttrace_get_page (pid, addr); | |
242 | page->refcount--; | |
243 | ||
244 | gdb_assert (page->refcount >= 0); | |
245 | ||
246 | if (page->refcount == 0) | |
247 | { | |
a7be7fa8 | 248 | if (inf_ttrace_num_lwps_in_syscall == 0) |
932936f0 MK |
249 | { |
250 | if (ttrace (TT_PROC_SET_MPROTECT, pid, 0, | |
251 | addr, pagesize, page->prot) == -1) | |
252 | perror_with_name ("ttrace"); | |
253 | } | |
254 | ||
255 | inf_ttrace_page_dict.count--; | |
256 | if (inf_ttrace_page_dict.count == 0) | |
257 | inf_ttrace_disable_syscall_events (pid); | |
258 | ||
259 | page->prev->next = page->next; | |
260 | if (page->next) | |
261 | page->next->prev = page->prev; | |
262 | ||
263 | xfree (page); | |
264 | } | |
265 | } | |
266 | ||
267 | /* Mask the bits in PROT from the page protections that are currently | |
268 | in the dictionary for process PID. */ | |
269 | ||
270 | static void | |
271 | inf_ttrace_mask_page_protections (pid_t pid, int prot) | |
272 | { | |
273 | const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets); | |
274 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
275 | int bucket; | |
276 | ||
277 | for (bucket = 0; bucket < num_buckets; bucket++) | |
278 | { | |
279 | struct inf_ttrace_page *page; | |
280 | ||
281 | page = inf_ttrace_page_dict.buckets[bucket].next; | |
282 | while (page) | |
283 | { | |
284 | if (ttrace (TT_PROC_SET_MPROTECT, pid, 0, | |
285 | page->addr, pagesize, page->prot & ~prot) == -1) | |
286 | perror_with_name ("ttrace"); | |
287 | ||
288 | page = page->next; | |
289 | } | |
290 | } | |
291 | } | |
292 | ||
293 | /* Write-protect the pages in the dictionary for process PID. */ | |
294 | ||
295 | static void | |
296 | inf_ttrace_enable_page_protections (pid_t pid) | |
297 | { | |
298 | inf_ttrace_mask_page_protections (pid, PROT_WRITE); | |
299 | } | |
300 | ||
301 | /* Restore the protection of the pages in the dictionary for process | |
302 | PID. */ | |
303 | ||
304 | static void | |
305 | inf_ttrace_disable_page_protections (pid_t pid) | |
306 | { | |
307 | inf_ttrace_mask_page_protections (pid, 0); | |
308 | } | |
309 | ||
310 | /* Insert a "hardware" watchpoint for LEN bytes at address ADDR of | |
311 | type TYPE. */ | |
312 | ||
313 | static int | |
314 | inf_ttrace_insert_watchpoint (CORE_ADDR addr, int len, int type) | |
315 | { | |
316 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
317 | pid_t pid = ptid_get_pid (inferior_ptid); | |
318 | CORE_ADDR page_addr; | |
319 | int num_pages; | |
320 | int page; | |
321 | ||
322 | gdb_assert (type == hw_write); | |
323 | ||
324 | page_addr = (addr / pagesize) * pagesize; | |
325 | num_pages = (len + pagesize - 1) / pagesize; | |
326 | ||
327 | for (page = 0; page < num_pages; page++, page_addr += pagesize) | |
328 | inf_ttrace_insert_page (pid, page_addr); | |
329 | ||
330 | return 1; | |
331 | } | |
332 | ||
333 | /* Remove a "hardware" watchpoint for LEN bytes at address ADDR of | |
334 | type TYPE. */ | |
335 | ||
336 | static int | |
337 | inf_ttrace_remove_watchpoint (CORE_ADDR addr, int len, int type) | |
338 | { | |
339 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
340 | pid_t pid = ptid_get_pid (inferior_ptid); | |
341 | CORE_ADDR page_addr; | |
342 | int num_pages; | |
343 | int page; | |
344 | ||
345 | gdb_assert (type == hw_write); | |
346 | ||
347 | page_addr = (addr / pagesize) * pagesize; | |
348 | num_pages = (len + pagesize - 1) / pagesize; | |
349 | ||
350 | for (page = 0; page < num_pages; page++, page_addr += pagesize) | |
351 | inf_ttrace_remove_page (pid, page_addr); | |
352 | ||
353 | return 1; | |
354 | } | |
355 | ||
356 | static int | |
357 | inf_ttrace_can_use_hw_breakpoint (int type, int len, int ot) | |
358 | { | |
359 | return (type == bp_hardware_watchpoint); | |
360 | } | |
361 | ||
362 | static int | |
363 | inf_ttrace_region_size_ok_for_hw_watchpoint (int len) | |
364 | { | |
365 | return 1; | |
366 | } | |
367 | ||
368 | /* Return non-zero if the current inferior was (potentially) stopped | |
369 | by hitting a "hardware" watchpoint. */ | |
370 | ||
371 | static int | |
372 | inf_ttrace_stopped_by_watchpoint (void) | |
373 | { | |
374 | pid_t pid = ptid_get_pid (inferior_ptid); | |
375 | lwpid_t lwpid = ptid_get_lwp (inferior_ptid); | |
376 | ttstate_t tts; | |
377 | ||
378 | if (inf_ttrace_page_dict.count > 0) | |
379 | { | |
380 | if (ttrace (TT_LWP_GET_STATE, pid, lwpid, | |
381 | (uintptr_t)&tts, sizeof tts, 0) == -1) | |
382 | perror_with_name ("ttrace"); | |
383 | ||
384 | if (tts.tts_event == TTEVT_SIGNAL | |
385 | && tts.tts_u.tts_signal.tts_signo == SIGBUS) | |
386 | { | |
387 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
388 | void *addr = tts.tts_u.tts_signal.tts_siginfo.si_addr; | |
389 | CORE_ADDR page_addr = ((uintptr_t)addr / pagesize) * pagesize; | |
390 | ||
391 | if (inf_ttrace_get_page (pid, page_addr)) | |
392 | return 1; | |
393 | } | |
394 | } | |
395 | ||
396 | return 0; | |
397 | } | |
398 | \f | |
eee22bf8 MK |
399 | |
400 | /* File descriptors for pipes used as semaphores during initial | |
401 | startup of an inferior. */ | |
402 | static int inf_ttrace_pfd1[2]; | |
403 | static int inf_ttrace_pfd2[2]; | |
404 | ||
405 | static void | |
406 | do_cleanup_pfds (void *dummy) | |
407 | { | |
408 | close (inf_ttrace_pfd1[0]); | |
409 | close (inf_ttrace_pfd1[1]); | |
410 | close (inf_ttrace_pfd2[0]); | |
411 | close (inf_ttrace_pfd2[1]); | |
412 | } | |
413 | ||
414 | static void | |
415 | inf_ttrace_prepare (void) | |
416 | { | |
417 | if (pipe (inf_ttrace_pfd1) == -1) | |
418 | perror_with_name ("pipe"); | |
419 | ||
420 | if (pipe (inf_ttrace_pfd2) == -1) | |
421 | { | |
422 | close (inf_ttrace_pfd1[0]); | |
423 | close (inf_ttrace_pfd2[0]); | |
424 | perror_with_name ("pipe"); | |
425 | } | |
426 | } | |
427 | ||
428 | /* Prepare to be traced. */ | |
429 | ||
430 | static void | |
431 | inf_ttrace_me (void) | |
432 | { | |
433 | struct cleanup *old_chain = make_cleanup (do_cleanup_pfds, 0); | |
434 | char c; | |
435 | ||
436 | /* "Trace me, Dr. Memory!" */ | |
437 | if (ttrace (TT_PROC_SETTRC, 0, 0, 0, TT_VERSION, 0) == -1) | |
438 | perror_with_name ("ttrace"); | |
439 | ||
440 | /* Tell our parent that we are ready to be traced. */ | |
441 | if (write (inf_ttrace_pfd1[1], &c, sizeof c) != sizeof c) | |
442 | perror_with_name ("write"); | |
443 | ||
444 | /* Wait until our parent has set the initial event mask. */ | |
445 | if (read (inf_ttrace_pfd2[0], &c, sizeof c) != sizeof c) | |
446 | perror_with_name ("read"); | |
447 | ||
448 | do_cleanups (old_chain); | |
449 | } | |
450 | ||
451 | /* Start tracing PID. */ | |
452 | ||
453 | static void | |
454 | inf_ttrace_him (int pid) | |
455 | { | |
456 | struct cleanup *old_chain = make_cleanup (do_cleanup_pfds, 0); | |
457 | ttevent_t tte; | |
eee22bf8 MK |
458 | char c; |
459 | ||
460 | /* Wait until our child is ready to be traced. */ | |
461 | if (read (inf_ttrace_pfd1[0], &c, sizeof c) != sizeof c) | |
462 | perror_with_name ("read"); | |
463 | ||
464 | /* Set the initial event mask. */ | |
465 | memset (&tte, 0, sizeof (tte)); | |
a7be7fa8 MK |
466 | tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT; |
467 | tte.tte_events |= TTEVT_LWP_CREATE | TTEVT_LWP_EXIT | TTEVT_LWP_TERMINATE; | |
eee22bf8 MK |
468 | tte.tte_opts = TTEO_NOSTRCCHLD; |
469 | if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, | |
470 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
471 | perror_with_name ("ttrace"); | |
472 | ||
473 | /* Tell our child that we have set the initial event mask. */ | |
474 | if (write (inf_ttrace_pfd2[1], &c, sizeof c) != sizeof c) | |
475 | perror_with_name ("write"); | |
476 | ||
477 | do_cleanups (old_chain); | |
478 | ||
479 | push_target (ttrace_ops_hack); | |
480 | ||
481 | /* On some targets, there must be some explicit synchronization | |
482 | between the parent and child processes after the debugger forks, | |
483 | and before the child execs the debuggee program. This call | |
484 | basically gives permission for the child to exec. */ | |
485 | ||
486 | target_acknowledge_created_inferior (pid); | |
487 | ||
488 | /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h, and will | |
489 | be 1 or 2 depending on whether we're starting without or with a | |
490 | shell. */ | |
491 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); | |
492 | ||
493 | /* On some targets, there must be some explicit actions taken after | |
494 | the inferior has been started up. */ | |
495 | target_post_startup_inferior (pid_to_ptid (pid)); | |
496 | } | |
497 | ||
498 | static void | |
499 | inf_ttrace_create_inferior (char *exec_file, char *allargs, char **env, | |
500 | int from_tty) | |
501 | { | |
a7be7fa8 MK |
502 | gdb_assert (inf_ttrace_num_lwps == 0); |
503 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); | |
932936f0 | 504 | gdb_assert (inf_ttrace_page_dict.count == 0); |
932936f0 MK |
505 | gdb_assert (inf_ttrace_reenable_page_protections == 0); |
506 | ||
eee22bf8 MK |
507 | fork_inferior (exec_file, allargs, env, inf_ttrace_me, inf_ttrace_him, |
508 | inf_ttrace_prepare, NULL); | |
509 | ||
510 | /* We are at the first instruction we care about. */ | |
511 | observer_notify_inferior_created (¤t_target, from_tty); | |
512 | ||
513 | /* Pedal to the metal... */ | |
514 | proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0); | |
515 | } | |
516 | ||
517 | static void | |
518 | inf_ttrace_kill_inferior (void) | |
519 | { | |
520 | pid_t pid = ptid_get_pid (inferior_ptid); | |
521 | ||
522 | if (pid == 0) | |
523 | return; | |
524 | ||
525 | if (ttrace (TT_PROC_EXIT, pid, 0, 0, 0, 0) == -1) | |
526 | perror_with_name ("ttrace"); | |
527 | /* ??? Is it necessary to call ttrace_wait() here? */ | |
528 | target_mourn_inferior (); | |
529 | } | |
530 | ||
531 | static void | |
532 | inf_ttrace_mourn_inferior (void) | |
533 | { | |
932936f0 MK |
534 | const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets); |
535 | int bucket; | |
536 | ||
a7be7fa8 MK |
537 | inf_ttrace_num_lwps = 0; |
538 | inf_ttrace_num_lwps_in_syscall = 0; | |
932936f0 MK |
539 | |
540 | for (bucket = 0; bucket < num_buckets; bucket++) | |
541 | { | |
542 | struct inf_ttrace_page *page; | |
543 | struct inf_ttrace_page *next; | |
544 | ||
545 | page = inf_ttrace_page_dict.buckets[bucket].next; | |
546 | while (page) | |
547 | { | |
548 | next = page->next; | |
549 | xfree (page); | |
550 | page = next; | |
551 | } | |
552 | } | |
553 | inf_ttrace_page_dict.count = 0; | |
554 | ||
eee22bf8 MK |
555 | unpush_target (ttrace_ops_hack); |
556 | generic_mourn_inferior (); | |
557 | } | |
558 | ||
559 | static void | |
560 | inf_ttrace_attach (char *args, int from_tty) | |
561 | { | |
562 | char *exec_file; | |
563 | pid_t pid; | |
564 | char *dummy; | |
932936f0 | 565 | ttevent_t tte; |
eee22bf8 MK |
566 | |
567 | if (!args) | |
568 | error_no_arg ("process-id to attach"); | |
569 | ||
570 | dummy = args; | |
571 | pid = strtol (args, &dummy, 0); | |
572 | if (pid == 0 && args == dummy) | |
573 | error ("Illegal process-id: %s\n", args); | |
574 | ||
575 | if (pid == getpid ()) /* Trying to masturbate? */ | |
576 | error ("I refuse to debug myself!"); | |
577 | ||
578 | if (from_tty) | |
579 | { | |
580 | exec_file = (char *) get_exec_file (0); | |
581 | ||
582 | if (exec_file) | |
583 | printf_unfiltered ("Attaching to program: %s, %s\n", exec_file, | |
584 | target_pid_to_str (pid_to_ptid (pid))); | |
585 | else | |
586 | printf_unfiltered ("Attaching to %s\n", | |
587 | target_pid_to_str (pid_to_ptid (pid))); | |
588 | ||
589 | gdb_flush (gdb_stdout); | |
590 | } | |
591 | ||
a7be7fa8 MK |
592 | gdb_assert (inf_ttrace_num_lwps == 0); |
593 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); | |
594 | ||
eee22bf8 MK |
595 | if (ttrace (TT_PROC_ATTACH, pid, 0, TT_KILL_ON_EXIT, TT_VERSION, 0) == -1) |
596 | perror_with_name ("ttrace"); | |
597 | attach_flag = 1; | |
598 | ||
932936f0 | 599 | /* Set the initial event mask. */ |
932936f0 | 600 | memset (&tte, 0, sizeof (tte)); |
a7be7fa8 MK |
601 | tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT; |
602 | tte.tte_events |= TTEVT_LWP_CREATE | TTEVT_LWP_EXIT | TTEVT_LWP_TERMINATE; | |
932936f0 MK |
603 | tte.tte_opts = TTEO_NOSTRCCHLD; |
604 | if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, | |
605 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
606 | perror_with_name ("ttrace"); | |
607 | ||
eee22bf8 MK |
608 | inferior_ptid = pid_to_ptid (pid); |
609 | push_target (ttrace_ops_hack); | |
610 | ||
611 | /* Do this first, before anything has had a chance to query the | |
612 | inferior's symbol table or similar. */ | |
613 | observer_notify_inferior_created (¤t_target, from_tty); | |
614 | } | |
615 | ||
616 | static void | |
617 | inf_ttrace_detach (char *args, int from_tty) | |
618 | { | |
619 | int sig = 0; | |
620 | pid_t pid = ptid_get_pid (inferior_ptid); | |
621 | ||
622 | if (from_tty) | |
623 | { | |
624 | char *exec_file = get_exec_file (0); | |
625 | if (exec_file == 0) | |
626 | exec_file = ""; | |
627 | printf_unfiltered ("Detaching from program: %s, %s\n", exec_file, | |
628 | target_pid_to_str (pid_to_ptid (pid))); | |
629 | gdb_flush (gdb_stdout); | |
630 | } | |
631 | if (args) | |
632 | sig = atoi (args); | |
633 | ||
634 | /* ??? The HP-UX 11.0 ttrace(2) manual page doesn't mention that we | |
635 | can pass a signal number here. Does this really work? */ | |
636 | if (ttrace (TT_PROC_DETACH, pid, 0, 0, sig, 0) == -1) | |
637 | perror_with_name ("ttrace"); | |
638 | ||
a7be7fa8 MK |
639 | inf_ttrace_num_lwps = 0; |
640 | inf_ttrace_num_lwps_in_syscall = 0; | |
932936f0 | 641 | |
eee22bf8 | 642 | unpush_target (ttrace_ops_hack); |
932936f0 | 643 | inferior_ptid = null_ptid; |
eee22bf8 MK |
644 | } |
645 | ||
646 | static void | |
647 | inf_ttrace_resume (ptid_t ptid, int step, enum target_signal signal) | |
648 | { | |
649 | pid_t pid = ptid_get_pid (ptid); | |
650 | lwpid_t lwpid = ptid_get_lwp (ptid); | |
651 | ttreq_t request = step ? TT_LWP_SINGLE : TT_LWP_CONTINUE; | |
652 | int sig = target_signal_to_host (signal); | |
653 | ||
654 | if (pid == -1) | |
655 | { | |
656 | pid = ptid_get_pid (inferior_ptid); | |
657 | lwpid = ptid_get_lwp (inferior_ptid); | |
658 | } | |
659 | ||
660 | if (ttrace (request, pid, lwpid, TT_NOPC, sig, 0) == -1) | |
661 | perror_with_name ("ttrace"); | |
662 | ||
663 | if (ptid_equal (ptid, minus_one_ptid)) | |
664 | { | |
665 | /* Let all the other threads run too. */ | |
666 | if (ttrace (TT_PROC_CONTINUE, pid, 0, 0, 0, 0) == -1) | |
667 | perror_with_name ("ttrace"); | |
668 | } | |
669 | } | |
670 | ||
671 | static ptid_t | |
672 | inf_ttrace_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
673 | { | |
674 | pid_t pid = ptid_get_pid (ptid); | |
675 | lwpid_t lwpid = ptid_get_lwp (ptid); | |
676 | ttstate_t tts; | |
677 | ||
932936f0 | 678 | /* Until proven otherwise. */ |
a7be7fa8 | 679 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; |
eee22bf8 MK |
680 | |
681 | if (pid == -1) | |
682 | pid = 0; | |
683 | ||
684 | gdb_assert (lwpid == 0 || pid != 0); | |
685 | ||
686 | do | |
687 | { | |
688 | set_sigint_trap (); | |
689 | set_sigio_trap (); | |
690 | ||
691 | if (ttrace_wait (pid, lwpid, TTRACE_WAITOK, &tts, sizeof tts) == -1) | |
692 | perror_with_name ("ttrace_wait"); | |
693 | ||
694 | clear_sigio_trap (); | |
695 | clear_sigint_trap (); | |
696 | } | |
697 | while (tts.tts_event == TTEVT_NONE); | |
698 | ||
932936f0 MK |
699 | /* Now that we've waited, we can re-enable the page protections. */ |
700 | if (inf_ttrace_reenable_page_protections) | |
701 | { | |
a7be7fa8 | 702 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); |
932936f0 MK |
703 | inf_ttrace_enable_page_protections (tts.tts_pid); |
704 | inf_ttrace_reenable_page_protections = 0; | |
705 | } | |
706 | ||
a7be7fa8 MK |
707 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); |
708 | ||
eee22bf8 MK |
709 | switch (tts.tts_event) |
710 | { | |
711 | case TTEVT_EXEC: | |
712 | /* Make it look like a breakpoint. */ | |
713 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
714 | ourstatus->value.sig = TARGET_SIGNAL_TRAP; | |
715 | break; | |
932936f0 | 716 | |
eee22bf8 MK |
717 | case TTEVT_EXIT: |
718 | store_waitstatus (ourstatus, tts.tts_u.tts_exit.tts_exitcode); | |
a7be7fa8 MK |
719 | inf_ttrace_num_lwps = 0; |
720 | break; | |
721 | ||
722 | case TTEVT_LWP_CREATE: | |
723 | lwpid = tts.tts_u.tts_thread.tts_target_lwpid; | |
724 | ptid = ptid_build (tts.tts_pid, lwpid, 0); | |
725 | if (inf_ttrace_num_lwps == 0) | |
726 | { | |
727 | /* Now that we're going to be multi-threaded, add the | |
728 | origional thread to the list first. */ | |
729 | add_thread (ptid_build (tts.tts_pid, tts.tts_lwpid, 0)); | |
730 | inf_ttrace_num_lwps++; | |
731 | } | |
732 | printf_filtered ("[New %s]\n", target_pid_to_str (ptid)); | |
733 | add_thread (ptid); | |
734 | inf_ttrace_num_lwps++; | |
735 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); | |
736 | break; | |
737 | ||
738 | case TTEVT_LWP_EXIT: | |
739 | printf_filtered("[%s exited]\n", target_pid_to_str (ptid)); | |
740 | delete_thread (ptid); | |
741 | inf_ttrace_num_lwps--; | |
742 | /* If we don't return -1 here, core GDB will re-add the thread. */ | |
743 | ptid = minus_one_ptid; | |
744 | break; | |
745 | ||
746 | case TTEVT_LWP_TERMINATE: | |
747 | lwpid = tts.tts_u.tts_thread.tts_target_lwpid; | |
748 | ptid = ptid_build (tts.tts_pid, lwpid, 0); | |
749 | printf_filtered("[%s has been terminated]\n", target_pid_to_str (ptid)); | |
750 | delete_thread (ptid); | |
751 | inf_ttrace_num_lwps--; | |
752 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); | |
eee22bf8 | 753 | break; |
932936f0 | 754 | |
eee22bf8 MK |
755 | case TTEVT_SIGNAL: |
756 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
757 | ourstatus->value.sig = | |
758 | target_signal_from_host (tts.tts_u.tts_signal.tts_signo); | |
759 | break; | |
932936f0 MK |
760 | |
761 | case TTEVT_SYSCALL_ENTRY: | |
762 | gdb_assert (inf_ttrace_reenable_page_protections == 0); | |
a7be7fa8 MK |
763 | inf_ttrace_num_lwps_in_syscall++; |
764 | if (inf_ttrace_num_lwps_in_syscall == 1) | |
932936f0 MK |
765 | { |
766 | /* A thread has just entered a system call. Disable any | |
767 | page protections as the kernel can't deal with them. */ | |
768 | inf_ttrace_disable_page_protections (tts.tts_pid); | |
769 | } | |
770 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_ENTRY; | |
771 | ourstatus->value.syscall_id = tts.tts_scno; | |
772 | break; | |
773 | ||
774 | case TTEVT_SYSCALL_RETURN: | |
a7be7fa8 | 775 | if (inf_ttrace_num_lwps_in_syscall > 0) |
932936f0 MK |
776 | { |
777 | /* If the last thread has just left the system call, this | |
778 | would be a logical place to re-enable the page | |
779 | protections, but that doesn't work. We can't re-enable | |
780 | them until we've done another wait. */ | |
781 | inf_ttrace_reenable_page_protections = | |
a7be7fa8 MK |
782 | (inf_ttrace_num_lwps_in_syscall == 1); |
783 | inf_ttrace_num_lwps_in_syscall--; | |
932936f0 MK |
784 | } |
785 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_RETURN; | |
786 | ourstatus->value.syscall_id = tts.tts_scno; | |
787 | break; | |
a7be7fa8 MK |
788 | |
789 | default: | |
790 | gdb_assert (!"Unexpected ttrace event"); | |
791 | break; | |
eee22bf8 MK |
792 | } |
793 | ||
794 | /* Make sure all threads within the process are stopped. */ | |
795 | if (ttrace (TT_PROC_STOP, tts.tts_pid, 0, 0, 0, 0) == -1) | |
796 | perror_with_name ("ttrace"); | |
797 | ||
798 | /* HACK: Twiddle INFERIOR_PTID such that the initial thread of a | |
799 | process isn't recognized as a new thread. */ | |
800 | if (ptid_get_lwp (inferior_ptid) == 0) | |
a7be7fa8 | 801 | inferior_ptid = ptid; |
eee22bf8 | 802 | |
a7be7fa8 | 803 | return ptid; |
eee22bf8 MK |
804 | } |
805 | ||
806 | /* Transfer LEN bytes from ADDR in the inferior's memory into READBUF, | |
807 | and transfer LEN bytes from WRITEBUF into the inferior's memory at | |
808 | ADDR. Either READBUF or WRITEBUF may be null, in which case the | |
809 | corresponding transfer doesn't happen. Return the number of bytes | |
810 | actually transferred (which may be zero if an error occurs). */ | |
811 | ||
812 | static LONGEST | |
813 | inf_ttrace_xfer_memory (CORE_ADDR addr, ULONGEST len, | |
814 | void *readbuf, const void *writebuf) | |
815 | { | |
816 | pid_t pid = ptid_get_pid (inferior_ptid); | |
817 | ||
818 | /* HP-UX treats text space and data space differently. GDB however, | |
819 | doesn't really know the difference. Therefore we try both. Try | |
820 | text space before data space though because when we're writing | |
821 | into text space the instruction cache might need to be flushed. */ | |
822 | ||
823 | if (readbuf | |
824 | && ttrace (TT_PROC_RDTEXT, pid, 0, addr, len, (uintptr_t)readbuf) == -1 | |
825 | && ttrace (TT_PROC_RDDATA, pid, 0, addr, len, (uintptr_t)readbuf) == -1) | |
826 | return 0; | |
827 | ||
828 | if (writebuf | |
829 | && ttrace (TT_PROC_WRTEXT, pid, 0, addr, len, (uintptr_t)writebuf) == -1 | |
830 | && ttrace (TT_PROC_WRDATA, pid, 0, addr, len, (uintptr_t)writebuf) == -1) | |
831 | return 0; | |
832 | ||
833 | return len; | |
834 | } | |
835 | ||
836 | static LONGEST | |
837 | inf_ttrace_xfer_partial (struct target_ops *ops, enum target_object object, | |
838 | const char *annex, void *readbuf, | |
839 | const void *writebuf, ULONGEST offset, LONGEST len) | |
840 | { | |
841 | switch (object) | |
842 | { | |
843 | case TARGET_OBJECT_MEMORY: | |
844 | return inf_ttrace_xfer_memory (offset, len, readbuf, writebuf); | |
845 | ||
846 | case TARGET_OBJECT_UNWIND_TABLE: | |
847 | return -1; | |
848 | ||
849 | case TARGET_OBJECT_AUXV: | |
850 | return -1; | |
851 | ||
852 | case TARGET_OBJECT_WCOOKIE: | |
853 | return -1; | |
854 | ||
855 | default: | |
856 | return -1; | |
857 | } | |
858 | } | |
859 | ||
860 | /* Print status information about what we're accessing. */ | |
861 | ||
862 | static void | |
863 | inf_ttrace_files_info (struct target_ops *ignore) | |
864 | { | |
865 | printf_unfiltered ("\tUsing the running image of %s %s.\n", | |
866 | attach_flag ? "attached" : "child", | |
867 | target_pid_to_str (inferior_ptid)); | |
868 | } | |
a7be7fa8 MK |
869 | |
870 | static int | |
871 | inf_ttrace_thread_alive (ptid_t ptid) | |
872 | { | |
873 | return 1; | |
874 | } | |
875 | ||
876 | static char * | |
877 | inf_ttrace_pid_to_str (ptid_t ptid) | |
878 | { | |
879 | if (inf_ttrace_num_lwps > 0) | |
880 | { | |
881 | pid_t pid = ptid_get_pid (ptid); | |
882 | lwpid_t lwpid = ptid_get_lwp (ptid); | |
883 | static char buf[80]; | |
884 | ||
885 | sprintf (buf, "process %ld, lwp %ld", (long)pid, (long)lwpid); | |
886 | return buf; | |
887 | } | |
888 | ||
889 | return normal_pid_to_str (ptid); | |
890 | } | |
eee22bf8 MK |
891 | \f |
892 | ||
893 | struct target_ops * | |
894 | inf_ttrace_target (void) | |
895 | { | |
896 | struct target_ops *t = inf_child_target (); | |
897 | ||
898 | t->to_create_inferior = inf_ttrace_create_inferior; | |
899 | t->to_kill = inf_ttrace_kill_inferior; | |
900 | t->to_mourn_inferior = inf_ttrace_mourn_inferior; | |
901 | t->to_attach = inf_ttrace_attach; | |
902 | t->to_detach = inf_ttrace_detach; | |
903 | t->to_resume = inf_ttrace_resume; | |
904 | t->to_wait = inf_ttrace_wait; | |
905 | t->to_xfer_partial = inf_ttrace_xfer_partial; | |
906 | t->to_files_info = inf_ttrace_files_info; | |
a7be7fa8 MK |
907 | t->to_thread_alive = inf_ttrace_thread_alive; |
908 | t->to_pid_to_str = inf_ttrace_pid_to_str; | |
932936f0 MK |
909 | t->to_can_use_hw_breakpoint = inf_ttrace_can_use_hw_breakpoint; |
910 | t->to_region_size_ok_for_hw_watchpoint = | |
911 | inf_ttrace_region_size_ok_for_hw_watchpoint; | |
912 | t->to_insert_watchpoint = inf_ttrace_insert_watchpoint; | |
913 | t->to_remove_watchpoint = inf_ttrace_remove_watchpoint; | |
914 | t->to_stopped_by_watchpoint = inf_ttrace_stopped_by_watchpoint; | |
eee22bf8 MK |
915 | |
916 | ttrace_ops_hack = t; | |
917 | return t; | |
918 | } | |
932936f0 MK |
919 | \f |
920 | ||
921 | /* Prevent warning from -Wmissing-prototypes. */ | |
922 | void _initialize_hppa_hpux_nat (void); | |
eee22bf8 | 923 | |
932936f0 MK |
924 | void |
925 | _initialize_inf_ttrace (void) | |
926 | { | |
927 | inf_ttrace_page_dict.pagesize = getpagesize(); | |
928 | } | |
eee22bf8 | 929 | #endif |