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eee22bf8 MK |
1 | /* Low-level child interface to ttrace. |
2 | ||
32d0add0 | 3 | Copyright (C) 2004-2015 Free Software Foundation, Inc. |
eee22bf8 MK |
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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
eee22bf8 MK |
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 | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
eee22bf8 MK |
19 | |
20 | #include "defs.h" | |
21 | ||
22 | /* The ttrace(2) system call didn't exist before HP-UX 10.30. Don't | |
23 | try to compile this code unless we have it. */ | |
24 | #ifdef HAVE_TTRACE | |
25 | ||
26 | #include "command.h" | |
27 | #include "gdbcore.h" | |
a7be7fa8 | 28 | #include "gdbthread.h" |
eee22bf8 | 29 | #include "inferior.h" |
191c4426 | 30 | #include "terminal.h" |
eee22bf8 | 31 | #include "target.h" |
932936f0 | 32 | #include <sys/mman.h> |
eee22bf8 | 33 | #include <sys/ttrace.h> |
438ac09b | 34 | #include <signal.h> |
eee22bf8 MK |
35 | |
36 | #include "inf-child.h" | |
37 | #include "inf-ttrace.h" | |
21ff4686 | 38 | #include "common/filestuff.h" |
eee22bf8 | 39 | |
932936f0 MK |
40 | \f |
41 | ||
a7be7fa8 MK |
42 | /* HP-UX uses a threading model where each user-space thread |
43 | corresponds to a kernel thread. These kernel threads are called | |
44 | lwps. The ttrace(2) interface gives us almost full control over | |
45 | the threads, which makes it very easy to support them in GDB. We | |
46 | identify the threads by process ID and lwp ID. The ttrace(2) also | |
47 | provides us with a thread's user ID (in the `tts_user_tid' member | |
48 | of `ttstate_t') but we don't use that (yet) as it isn't necessary | |
49 | to uniquely label the thread. */ | |
50 | ||
51 | /* Number of active lwps. */ | |
52 | static int inf_ttrace_num_lwps; | |
53 | \f | |
54 | ||
932936f0 MK |
55 | /* On HP-UX versions that have the ttrace(2) system call, we can |
56 | implement "hardware" watchpoints by fiddling with the protection of | |
57 | pages in the address space that contain the variable being watched. | |
58 | In order to implement this, we keep a dictionary of pages for which | |
59 | we have changed the protection. */ | |
60 | ||
61 | struct inf_ttrace_page | |
62 | { | |
63 | CORE_ADDR addr; /* Page address. */ | |
64 | int prot; /* Protection. */ | |
65 | int refcount; /* Reference count. */ | |
66 | struct inf_ttrace_page *next; | |
67 | struct inf_ttrace_page *prev; | |
68 | }; | |
69 | ||
70 | struct inf_ttrace_page_dict | |
71 | { | |
72 | struct inf_ttrace_page buckets[128]; | |
73 | int pagesize; /* Page size. */ | |
74 | int count; /* Number of pages in this dictionary. */ | |
75 | } inf_ttrace_page_dict; | |
76 | ||
60e2c248 JG |
77 | struct inf_ttrace_private_thread_info |
78 | { | |
79 | int dying; | |
80 | }; | |
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) | |
e2e0b3e5 | 101 | perror_with_name (("ttrace")); |
932936f0 MK |
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) | |
e2e0b3e5 | 107 | perror_with_name (("ttrace")); |
932936f0 MK |
108 | |
109 | if (ttrace (TT_PROC_GET_FIRST_LWP_STATE, pid, 0, | |
110 | (uintptr_t)&tts, sizeof tts, 0) == -1) | |
e2e0b3e5 | 111 | perror_with_name (("ttrace")); |
932936f0 MK |
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) | |
e2e0b3e5 | 130 | perror_with_name (("ttrace")); |
932936f0 MK |
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) | |
e2e0b3e5 | 136 | perror_with_name (("ttrace")); |
932936f0 | 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) | |
e2e0b3e5 | 193 | perror_with_name (("ttrace")); |
932936f0 | 194 | |
70ba0933 | 195 | page = XNEW (struct inf_ttrace_page); |
932936f0 MK |
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) | |
e2e0b3e5 | 212 | perror_with_name (("ttrace")); |
932936f0 MK |
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) | |
e2e0b3e5 | 252 | perror_with_name (("ttrace")); |
932936f0 MK |
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) | |
e2e0b3e5 | 286 | perror_with_name (("ttrace")); |
932936f0 MK |
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 | |
7bb99c53 TT |
314 | inf_ttrace_insert_watchpoint (struct target_ops *self, |
315 | CORE_ADDR addr, int len, int type, | |
0cf6dd15 | 316 | struct expression *cond) |
932936f0 MK |
317 | { |
318 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
319 | pid_t pid = ptid_get_pid (inferior_ptid); | |
320 | CORE_ADDR page_addr; | |
321 | int num_pages; | |
322 | int page; | |
323 | ||
324 | gdb_assert (type == hw_write); | |
325 | ||
326 | page_addr = (addr / pagesize) * pagesize; | |
327 | num_pages = (len + pagesize - 1) / pagesize; | |
328 | ||
329 | for (page = 0; page < num_pages; page++, page_addr += pagesize) | |
330 | inf_ttrace_insert_page (pid, page_addr); | |
331 | ||
332 | return 1; | |
333 | } | |
334 | ||
335 | /* Remove a "hardware" watchpoint for LEN bytes at address ADDR of | |
336 | type TYPE. */ | |
337 | ||
338 | static int | |
11b5219a TT |
339 | inf_ttrace_remove_watchpoint (struct target_ops *self, |
340 | CORE_ADDR addr, int len, int type, | |
0cf6dd15 | 341 | struct expression *cond) |
932936f0 MK |
342 | { |
343 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
344 | pid_t pid = ptid_get_pid (inferior_ptid); | |
345 | CORE_ADDR page_addr; | |
346 | int num_pages; | |
347 | int page; | |
348 | ||
349 | gdb_assert (type == hw_write); | |
350 | ||
351 | page_addr = (addr / pagesize) * pagesize; | |
352 | num_pages = (len + pagesize - 1) / pagesize; | |
353 | ||
354 | for (page = 0; page < num_pages; page++, page_addr += pagesize) | |
355 | inf_ttrace_remove_page (pid, page_addr); | |
356 | ||
357 | return 1; | |
358 | } | |
359 | ||
360 | static int | |
5461485a TT |
361 | inf_ttrace_can_use_hw_breakpoint (struct target_ops *self, |
362 | int type, int len, int ot) | |
932936f0 MK |
363 | { |
364 | return (type == bp_hardware_watchpoint); | |
365 | } | |
366 | ||
367 | static int | |
31568a15 TT |
368 | inf_ttrace_region_ok_for_hw_watchpoint (struct target_ops *self, |
369 | CORE_ADDR addr, int len) | |
932936f0 MK |
370 | { |
371 | return 1; | |
372 | } | |
373 | ||
374 | /* Return non-zero if the current inferior was (potentially) stopped | |
375 | by hitting a "hardware" watchpoint. */ | |
376 | ||
377 | static int | |
6a109b6b | 378 | inf_ttrace_stopped_by_watchpoint (struct target_ops *ops) |
932936f0 MK |
379 | { |
380 | pid_t pid = ptid_get_pid (inferior_ptid); | |
381 | lwpid_t lwpid = ptid_get_lwp (inferior_ptid); | |
382 | ttstate_t tts; | |
383 | ||
384 | if (inf_ttrace_page_dict.count > 0) | |
385 | { | |
386 | if (ttrace (TT_LWP_GET_STATE, pid, lwpid, | |
387 | (uintptr_t)&tts, sizeof tts, 0) == -1) | |
e2e0b3e5 | 388 | perror_with_name (("ttrace")); |
932936f0 MK |
389 | |
390 | if (tts.tts_event == TTEVT_SIGNAL | |
391 | && tts.tts_u.tts_signal.tts_signo == SIGBUS) | |
392 | { | |
393 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
394 | void *addr = tts.tts_u.tts_signal.tts_siginfo.si_addr; | |
395 | CORE_ADDR page_addr = ((uintptr_t)addr / pagesize) * pagesize; | |
396 | ||
397 | if (inf_ttrace_get_page (pid, page_addr)) | |
398 | return 1; | |
399 | } | |
400 | } | |
401 | ||
402 | return 0; | |
403 | } | |
404 | \f | |
eee22bf8 | 405 | |
d83ad864 DB |
406 | /* Target hook for follow_fork. On entry and at return inferior_ptid |
407 | is the ptid of the followed inferior. */ | |
b2a4db28 MK |
408 | |
409 | static int | |
07107ca6 LM |
410 | inf_ttrace_follow_fork (struct target_ops *ops, int follow_child, |
411 | int detach_fork) | |
b2a4db28 | 412 | { |
e58b0e63 PA |
413 | struct thread_info *tp = inferior_thread (); |
414 | ||
415 | gdb_assert (tp->pending_follow.kind == TARGET_WAITKIND_FORKED | |
416 | || tp->pending_follow.kind == TARGET_WAITKIND_VFORKED); | |
417 | ||
b2a4db28 MK |
418 | if (follow_child) |
419 | { | |
2935f27f PA |
420 | struct thread_info *ti; |
421 | ||
b2a4db28 | 422 | /* The child will start out single-threaded. */ |
2935f27f | 423 | inf_ttrace_num_lwps = 1; |
b2a4db28 MK |
424 | inf_ttrace_num_lwps_in_syscall = 0; |
425 | ||
d83ad864 | 426 | ti = inferior_thread (); |
2935f27f PA |
427 | ti->private = |
428 | xmalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
429 | memset (ti->private, 0, | |
430 | sizeof (struct inf_ttrace_private_thread_info)); | |
b2a4db28 | 431 | } |
d83ad864 DB |
432 | else |
433 | { | |
434 | pid_t child_pid; | |
435 | ||
436 | /* Following parent. Detach child now. */ | |
437 | child_pid = ptid_get_pid (tp->pending_follow.value.related_pid); | |
438 | if (ttrace (TT_PROC_DETACH, child_pid, 0, 0, 0, 0) == -1) | |
439 | perror_with_name (("ttrace")); | |
440 | } | |
b2a4db28 MK |
441 | |
442 | return 0; | |
443 | } | |
444 | \f | |
445 | ||
eee22bf8 MK |
446 | /* File descriptors for pipes used as semaphores during initial |
447 | startup of an inferior. */ | |
448 | static int inf_ttrace_pfd1[2]; | |
449 | static int inf_ttrace_pfd2[2]; | |
450 | ||
451 | static void | |
452 | do_cleanup_pfds (void *dummy) | |
453 | { | |
454 | close (inf_ttrace_pfd1[0]); | |
455 | close (inf_ttrace_pfd1[1]); | |
456 | close (inf_ttrace_pfd2[0]); | |
457 | close (inf_ttrace_pfd2[1]); | |
21ff4686 TT |
458 | |
459 | unmark_fd_no_cloexec (inf_ttrace_pfd1[0]); | |
460 | unmark_fd_no_cloexec (inf_ttrace_pfd1[1]); | |
461 | unmark_fd_no_cloexec (inf_ttrace_pfd2[0]); | |
462 | unmark_fd_no_cloexec (inf_ttrace_pfd2[1]); | |
eee22bf8 MK |
463 | } |
464 | ||
465 | static void | |
466 | inf_ttrace_prepare (void) | |
467 | { | |
468 | if (pipe (inf_ttrace_pfd1) == -1) | |
a3f17187 | 469 | perror_with_name (("pipe")); |
eee22bf8 MK |
470 | |
471 | if (pipe (inf_ttrace_pfd2) == -1) | |
472 | { | |
473 | close (inf_ttrace_pfd1[0]); | |
474 | close (inf_ttrace_pfd2[0]); | |
a3f17187 | 475 | perror_with_name (("pipe")); |
eee22bf8 | 476 | } |
21ff4686 TT |
477 | |
478 | mark_fd_no_cloexec (inf_ttrace_pfd1[0]); | |
479 | mark_fd_no_cloexec (inf_ttrace_pfd1[1]); | |
480 | mark_fd_no_cloexec (inf_ttrace_pfd2[0]); | |
481 | mark_fd_no_cloexec (inf_ttrace_pfd2[1]); | |
eee22bf8 MK |
482 | } |
483 | ||
484 | /* Prepare to be traced. */ | |
485 | ||
486 | static void | |
487 | inf_ttrace_me (void) | |
488 | { | |
489 | struct cleanup *old_chain = make_cleanup (do_cleanup_pfds, 0); | |
490 | char c; | |
491 | ||
492 | /* "Trace me, Dr. Memory!" */ | |
493 | if (ttrace (TT_PROC_SETTRC, 0, 0, 0, TT_VERSION, 0) == -1) | |
e2e0b3e5 | 494 | perror_with_name (("ttrace")); |
eee22bf8 MK |
495 | |
496 | /* Tell our parent that we are ready to be traced. */ | |
497 | if (write (inf_ttrace_pfd1[1], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 498 | perror_with_name (("write")); |
eee22bf8 MK |
499 | |
500 | /* Wait until our parent has set the initial event mask. */ | |
501 | if (read (inf_ttrace_pfd2[0], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 502 | perror_with_name (("read")); |
eee22bf8 MK |
503 | |
504 | do_cleanups (old_chain); | |
505 | } | |
506 | ||
507 | /* Start tracing PID. */ | |
508 | ||
509 | static void | |
28439f5e | 510 | inf_ttrace_him (struct target_ops *ops, int pid) |
eee22bf8 MK |
511 | { |
512 | struct cleanup *old_chain = make_cleanup (do_cleanup_pfds, 0); | |
513 | ttevent_t tte; | |
eee22bf8 MK |
514 | char c; |
515 | ||
516 | /* Wait until our child is ready to be traced. */ | |
517 | if (read (inf_ttrace_pfd1[0], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 518 | perror_with_name (("read")); |
eee22bf8 MK |
519 | |
520 | /* Set the initial event mask. */ | |
521 | memset (&tte, 0, sizeof (tte)); | |
b2a4db28 | 522 | tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT | TTEVT_FORK | TTEVT_VFORK; |
a7be7fa8 | 523 | tte.tte_events |= TTEVT_LWP_CREATE | TTEVT_LWP_EXIT | TTEVT_LWP_TERMINATE; |
7ba0e0c2 MK |
524 | #ifdef TTEVT_BPT_SSTEP |
525 | tte.tte_events |= TTEVT_BPT_SSTEP; | |
526 | #endif | |
b2a4db28 | 527 | tte.tte_opts |= TTEO_PROC_INHERIT; |
eee22bf8 MK |
528 | if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, |
529 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 530 | perror_with_name (("ttrace")); |
eee22bf8 MK |
531 | |
532 | /* Tell our child that we have set the initial event mask. */ | |
533 | if (write (inf_ttrace_pfd2[1], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 534 | perror_with_name (("write")); |
eee22bf8 MK |
535 | |
536 | do_cleanups (old_chain); | |
537 | ||
6a3cb8e8 PA |
538 | if (!target_is_pushed (ops)) |
539 | push_target (ops); | |
eee22bf8 | 540 | |
eee22bf8 MK |
541 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); |
542 | ||
543 | /* On some targets, there must be some explicit actions taken after | |
544 | the inferior has been started up. */ | |
545 | target_post_startup_inferior (pid_to_ptid (pid)); | |
546 | } | |
547 | ||
548 | static void | |
136d6dae VP |
549 | inf_ttrace_create_inferior (struct target_ops *ops, char *exec_file, |
550 | char *allargs, char **env, int from_tty) | |
eee22bf8 | 551 | { |
28439f5e PA |
552 | int pid; |
553 | ||
a7be7fa8 MK |
554 | gdb_assert (inf_ttrace_num_lwps == 0); |
555 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); | |
932936f0 | 556 | gdb_assert (inf_ttrace_page_dict.count == 0); |
932936f0 MK |
557 | gdb_assert (inf_ttrace_reenable_page_protections == 0); |
558 | ||
28439f5e | 559 | pid = fork_inferior (exec_file, allargs, env, inf_ttrace_me, NULL, |
e69860f1 | 560 | inf_ttrace_prepare, NULL, NULL); |
28439f5e PA |
561 | |
562 | inf_ttrace_him (ops, pid); | |
eee22bf8 MK |
563 | } |
564 | ||
eee22bf8 | 565 | static void |
136d6dae | 566 | inf_ttrace_mourn_inferior (struct target_ops *ops) |
eee22bf8 | 567 | { |
932936f0 MK |
568 | const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets); |
569 | int bucket; | |
570 | ||
a7be7fa8 MK |
571 | inf_ttrace_num_lwps = 0; |
572 | inf_ttrace_num_lwps_in_syscall = 0; | |
932936f0 MK |
573 | |
574 | for (bucket = 0; bucket < num_buckets; bucket++) | |
575 | { | |
576 | struct inf_ttrace_page *page; | |
577 | struct inf_ttrace_page *next; | |
578 | ||
579 | page = inf_ttrace_page_dict.buckets[bucket].next; | |
580 | while (page) | |
581 | { | |
582 | next = page->next; | |
583 | xfree (page); | |
584 | page = next; | |
585 | } | |
586 | } | |
587 | inf_ttrace_page_dict.count = 0; | |
588 | ||
c1ee2fb3 | 589 | inf_child_mourn_inferior (ops); |
eee22bf8 MK |
590 | } |
591 | ||
f688d93f JB |
592 | /* Assuming we just attached the debugger to a new inferior, create |
593 | a new thread_info structure for each thread, and add it to our | |
594 | list of threads. */ | |
595 | ||
596 | static void | |
597 | inf_ttrace_create_threads_after_attach (int pid) | |
598 | { | |
599 | int status; | |
600 | ptid_t ptid; | |
601 | ttstate_t tts; | |
602 | struct thread_info *ti; | |
603 | ||
604 | status = ttrace (TT_PROC_GET_FIRST_LWP_STATE, pid, 0, | |
605 | (uintptr_t) &tts, sizeof (ttstate_t), 0); | |
606 | if (status < 0) | |
607 | perror_with_name (_("TT_PROC_GET_FIRST_LWP_STATE ttrace call failed")); | |
608 | gdb_assert (tts.tts_pid == pid); | |
609 | ||
610 | /* Add the stopped thread. */ | |
611 | ptid = ptid_build (pid, tts.tts_lwpid, 0); | |
612 | ti = add_thread (ptid); | |
613 | ti->private = xzalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
614 | inf_ttrace_num_lwps++; | |
615 | ||
616 | /* We use the "first stopped thread" as the currently active thread. */ | |
617 | inferior_ptid = ptid; | |
618 | ||
619 | /* Iterative over all the remaining threads. */ | |
620 | ||
621 | for (;;) | |
622 | { | |
623 | ptid_t ptid; | |
624 | ||
625 | status = ttrace (TT_PROC_GET_NEXT_LWP_STATE, pid, 0, | |
626 | (uintptr_t) &tts, sizeof (ttstate_t), 0); | |
627 | if (status < 0) | |
628 | perror_with_name (_("TT_PROC_GET_NEXT_LWP_STATE ttrace call failed")); | |
629 | if (status == 0) | |
630 | break; /* End of list. */ | |
631 | ||
632 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); | |
633 | ti = add_thread (ptid); | |
634 | ti->private = xzalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
635 | inf_ttrace_num_lwps++; | |
636 | } | |
637 | } | |
638 | ||
eee22bf8 | 639 | static void |
c0939df1 | 640 | inf_ttrace_attach (struct target_ops *ops, const char *args, int from_tty) |
eee22bf8 MK |
641 | { |
642 | char *exec_file; | |
643 | pid_t pid; | |
932936f0 | 644 | ttevent_t tte; |
181e7f93 | 645 | struct inferior *inf; |
eee22bf8 | 646 | |
74164c56 | 647 | pid = parse_pid_to_attach (args); |
eee22bf8 MK |
648 | |
649 | if (pid == getpid ()) /* Trying to masturbate? */ | |
8a3fe4f8 | 650 | error (_("I refuse to debug myself!")); |
eee22bf8 MK |
651 | |
652 | if (from_tty) | |
653 | { | |
346e281c | 654 | exec_file = get_exec_file (0); |
eee22bf8 MK |
655 | |
656 | if (exec_file) | |
a3f17187 | 657 | printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
eee22bf8 MK |
658 | target_pid_to_str (pid_to_ptid (pid))); |
659 | else | |
a3f17187 | 660 | printf_unfiltered (_("Attaching to %s\n"), |
eee22bf8 MK |
661 | target_pid_to_str (pid_to_ptid (pid))); |
662 | ||
663 | gdb_flush (gdb_stdout); | |
664 | } | |
665 | ||
a7be7fa8 MK |
666 | gdb_assert (inf_ttrace_num_lwps == 0); |
667 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); | |
668 | ||
eee22bf8 | 669 | if (ttrace (TT_PROC_ATTACH, pid, 0, TT_KILL_ON_EXIT, TT_VERSION, 0) == -1) |
e2e0b3e5 | 670 | perror_with_name (("ttrace")); |
eee22bf8 | 671 | |
6c95b8df PA |
672 | inf = current_inferior (); |
673 | inferior_appeared (inf, pid); | |
181e7f93 | 674 | inf->attach_flag = 1; |
7f9f62ba | 675 | |
932936f0 | 676 | /* Set the initial event mask. */ |
932936f0 | 677 | memset (&tte, 0, sizeof (tte)); |
b2a4db28 | 678 | tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT | TTEVT_FORK | TTEVT_VFORK; |
a7be7fa8 | 679 | tte.tte_events |= TTEVT_LWP_CREATE | TTEVT_LWP_EXIT | TTEVT_LWP_TERMINATE; |
7ba0e0c2 MK |
680 | #ifdef TTEVT_BPT_SSTEP |
681 | tte.tte_events |= TTEVT_BPT_SSTEP; | |
682 | #endif | |
b2a4db28 | 683 | tte.tte_opts |= TTEO_PROC_INHERIT; |
932936f0 MK |
684 | if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, |
685 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 686 | perror_with_name (("ttrace")); |
932936f0 | 687 | |
6a3cb8e8 PA |
688 | if (!target_is_pushed (ops)) |
689 | push_target (ops); | |
2935f27f | 690 | |
f688d93f | 691 | inf_ttrace_create_threads_after_attach (pid); |
eee22bf8 MK |
692 | } |
693 | ||
694 | static void | |
52554a0e | 695 | inf_ttrace_detach (struct target_ops *ops, const char *args, int from_tty) |
eee22bf8 | 696 | { |
eee22bf8 | 697 | pid_t pid = ptid_get_pid (inferior_ptid); |
5d426ff1 | 698 | int sig = 0; |
eee22bf8 MK |
699 | |
700 | if (from_tty) | |
701 | { | |
702 | char *exec_file = get_exec_file (0); | |
703 | if (exec_file == 0) | |
704 | exec_file = ""; | |
a3f17187 | 705 | printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file, |
eee22bf8 MK |
706 | target_pid_to_str (pid_to_ptid (pid))); |
707 | gdb_flush (gdb_stdout); | |
708 | } | |
709 | if (args) | |
710 | sig = atoi (args); | |
711 | ||
712 | /* ??? The HP-UX 11.0 ttrace(2) manual page doesn't mention that we | |
713 | can pass a signal number here. Does this really work? */ | |
714 | if (ttrace (TT_PROC_DETACH, pid, 0, 0, sig, 0) == -1) | |
e2e0b3e5 | 715 | perror_with_name (("ttrace")); |
eee22bf8 | 716 | |
a7be7fa8 MK |
717 | inf_ttrace_num_lwps = 0; |
718 | inf_ttrace_num_lwps_in_syscall = 0; | |
932936f0 | 719 | |
932936f0 | 720 | inferior_ptid = null_ptid; |
7f9f62ba PA |
721 | detach_inferior (pid); |
722 | ||
6a3cb8e8 | 723 | inf_child_maybe_unpush_target (ops); |
eee22bf8 MK |
724 | } |
725 | ||
346e281c | 726 | static void |
7d85a9c0 | 727 | inf_ttrace_kill (struct target_ops *ops) |
346e281c MK |
728 | { |
729 | pid_t pid = ptid_get_pid (inferior_ptid); | |
730 | ||
731 | if (pid == 0) | |
732 | return; | |
733 | ||
734 | if (ttrace (TT_PROC_EXIT, pid, 0, 0, 0, 0) == -1) | |
735 | perror_with_name (("ttrace")); | |
736 | /* ??? Is it necessary to call ttrace_wait() here? */ | |
737 | ||
346e281c MK |
738 | target_mourn_inferior (); |
739 | } | |
740 | ||
438ac09b PA |
741 | /* Check is a dying thread is dead by now, and delete it from GDBs |
742 | thread list if so. */ | |
7ba0e0c2 | 743 | static int |
438ac09b | 744 | inf_ttrace_delete_dead_threads_callback (struct thread_info *info, void *arg) |
7ba0e0c2 | 745 | { |
438ac09b PA |
746 | lwpid_t lwpid; |
747 | struct inf_ttrace_private_thread_info *p; | |
7ba0e0c2 | 748 | |
438ac09b PA |
749 | if (is_exited (info->ptid)) |
750 | return 0; | |
751 | ||
752 | lwpid = ptid_get_lwp (info->ptid); | |
753 | p = (struct inf_ttrace_private_thread_info *) info->private; | |
754 | ||
755 | /* Check if an lwp that was dying is still there or not. */ | |
756 | if (p->dying && (kill (lwpid, 0) == -1)) | |
757 | /* It's gone now. */ | |
758 | delete_thread (info->ptid); | |
7ba0e0c2 MK |
759 | |
760 | return 0; | |
761 | } | |
762 | ||
438ac09b PA |
763 | /* Resume the lwp pointed to by INFO, with REQUEST, and pass it signal |
764 | SIG. */ | |
765 | ||
766 | static void | |
767 | inf_ttrace_resume_lwp (struct thread_info *info, ttreq_t request, int sig) | |
768 | { | |
769 | pid_t pid = ptid_get_pid (info->ptid); | |
770 | lwpid_t lwpid = ptid_get_lwp (info->ptid); | |
771 | ||
772 | if (ttrace (request, pid, lwpid, TT_NOPC, sig, 0) == -1) | |
773 | { | |
774 | struct inf_ttrace_private_thread_info *p | |
775 | = (struct inf_ttrace_private_thread_info *) info->private; | |
776 | if (p->dying && errno == EPROTO) | |
777 | /* This is expected, it means the dying lwp is really gone | |
778 | by now. If ttrace had an event to inform the debugger | |
779 | the lwp is really gone, this wouldn't be needed. */ | |
780 | delete_thread (info->ptid); | |
781 | else | |
782 | /* This was really unexpected. */ | |
783 | perror_with_name (("ttrace")); | |
784 | } | |
785 | } | |
786 | ||
787 | /* Callback for iterate_over_threads. */ | |
788 | ||
60e2c248 | 789 | static int |
438ac09b | 790 | inf_ttrace_resume_callback (struct thread_info *info, void *arg) |
60e2c248 | 791 | { |
438ac09b PA |
792 | if (!ptid_equal (info->ptid, inferior_ptid) && !is_exited (info->ptid)) |
793 | inf_ttrace_resume_lwp (info, TT_LWP_CONTINUE, 0); | |
794 | ||
60e2c248 JG |
795 | return 0; |
796 | } | |
797 | ||
eee22bf8 | 798 | static void |
28439f5e | 799 | inf_ttrace_resume (struct target_ops *ops, |
2ea28649 | 800 | ptid_t ptid, int step, enum gdb_signal signal) |
eee22bf8 | 801 | { |
438ac09b | 802 | int resume_all; |
eee22bf8 | 803 | ttreq_t request = step ? TT_LWP_SINGLE : TT_LWP_CONTINUE; |
2ea28649 | 804 | int sig = gdb_signal_to_host (signal); |
438ac09b | 805 | struct thread_info *info; |
eee22bf8 | 806 | |
438ac09b PA |
807 | /* A specific PTID means `step only this process id'. */ |
808 | resume_all = (ptid_equal (ptid, minus_one_ptid)); | |
eee22bf8 | 809 | |
438ac09b PA |
810 | /* If resuming all threads, it's the current thread that should be |
811 | handled specially. */ | |
812 | if (resume_all) | |
813 | ptid = inferior_ptid; | |
eee22bf8 | 814 | |
e09875d4 | 815 | info = find_thread_ptid (ptid); |
438ac09b PA |
816 | inf_ttrace_resume_lwp (info, request, sig); |
817 | ||
818 | if (resume_all) | |
819 | /* Let all the other threads run too. */ | |
820 | iterate_over_threads (inf_ttrace_resume_callback, NULL); | |
eee22bf8 MK |
821 | } |
822 | ||
823 | static ptid_t | |
117de6a9 | 824 | inf_ttrace_wait (struct target_ops *ops, |
47608cb1 | 825 | ptid_t ptid, struct target_waitstatus *ourstatus, int options) |
eee22bf8 MK |
826 | { |
827 | pid_t pid = ptid_get_pid (ptid); | |
828 | lwpid_t lwpid = ptid_get_lwp (ptid); | |
829 | ttstate_t tts; | |
60e2c248 | 830 | struct thread_info *ti; |
3a3e9ee3 | 831 | ptid_t related_ptid; |
eee22bf8 | 832 | |
932936f0 | 833 | /* Until proven otherwise. */ |
a7be7fa8 | 834 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; |
eee22bf8 MK |
835 | |
836 | if (pid == -1) | |
b2a4db28 | 837 | pid = lwpid = 0; |
eee22bf8 | 838 | |
b2a4db28 | 839 | gdb_assert (pid != 0 || lwpid == 0); |
eee22bf8 MK |
840 | |
841 | do | |
842 | { | |
843 | set_sigint_trap (); | |
eee22bf8 MK |
844 | |
845 | if (ttrace_wait (pid, lwpid, TTRACE_WAITOK, &tts, sizeof tts) == -1) | |
a3f17187 | 846 | perror_with_name (("ttrace_wait")); |
eee22bf8 | 847 | |
eee22bf8 MK |
848 | clear_sigint_trap (); |
849 | } | |
850 | while (tts.tts_event == TTEVT_NONE); | |
851 | ||
932936f0 MK |
852 | /* Now that we've waited, we can re-enable the page protections. */ |
853 | if (inf_ttrace_reenable_page_protections) | |
854 | { | |
a7be7fa8 | 855 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); |
932936f0 MK |
856 | inf_ttrace_enable_page_protections (tts.tts_pid); |
857 | inf_ttrace_reenable_page_protections = 0; | |
858 | } | |
859 | ||
a7be7fa8 MK |
860 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); |
861 | ||
2935f27f PA |
862 | if (inf_ttrace_num_lwps == 0) |
863 | { | |
864 | struct thread_info *ti; | |
865 | ||
866 | inf_ttrace_num_lwps = 1; | |
867 | ||
868 | /* This is the earliest we hear about the lwp member of | |
869 | INFERIOR_PTID, after an attach or fork_inferior. */ | |
870 | gdb_assert (ptid_get_lwp (inferior_ptid) == 0); | |
871 | ||
872 | /* We haven't set the private member on the main thread yet. Do | |
873 | it now. */ | |
e09875d4 | 874 | ti = find_thread_ptid (inferior_ptid); |
2935f27f PA |
875 | gdb_assert (ti != NULL && ti->private == NULL); |
876 | ti->private = | |
877 | xmalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
878 | memset (ti->private, 0, | |
879 | sizeof (struct inf_ttrace_private_thread_info)); | |
880 | ||
881 | /* Notify the core that this ptid changed. This changes | |
882 | inferior_ptid as well. */ | |
883 | thread_change_ptid (inferior_ptid, ptid); | |
884 | } | |
885 | ||
eee22bf8 MK |
886 | switch (tts.tts_event) |
887 | { | |
7ba0e0c2 MK |
888 | #ifdef TTEVT_BPT_SSTEP |
889 | case TTEVT_BPT_SSTEP: | |
890 | /* Make it look like a breakpoint. */ | |
891 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 892 | ourstatus->value.sig = GDB_SIGNAL_TRAP; |
7ba0e0c2 MK |
893 | break; |
894 | #endif | |
895 | ||
eee22bf8 | 896 | case TTEVT_EXEC: |
5d426ff1 MK |
897 | ourstatus->kind = TARGET_WAITKIND_EXECD; |
898 | ourstatus->value.execd_pathname = | |
899 | xmalloc (tts.tts_u.tts_exec.tts_pathlen + 1); | |
900 | if (ttrace (TT_PROC_GET_PATHNAME, tts.tts_pid, 0, | |
901 | (uintptr_t)ourstatus->value.execd_pathname, | |
902 | tts.tts_u.tts_exec.tts_pathlen, 0) == -1) | |
903 | perror_with_name (("ttrace")); | |
904 | ourstatus->value.execd_pathname[tts.tts_u.tts_exec.tts_pathlen] = 0; | |
25b22b0a PA |
905 | |
906 | /* At this point, all inserted breakpoints are gone. Doing this | |
907 | as soon as we detect an exec prevents the badness of deleting | |
908 | a breakpoint writing the current "shadow contents" to lift | |
909 | the bp. That shadow is NOT valid after an exec. */ | |
910 | mark_breakpoints_out (); | |
eee22bf8 | 911 | break; |
932936f0 | 912 | |
eee22bf8 MK |
913 | case TTEVT_EXIT: |
914 | store_waitstatus (ourstatus, tts.tts_u.tts_exit.tts_exitcode); | |
a7be7fa8 MK |
915 | inf_ttrace_num_lwps = 0; |
916 | break; | |
917 | ||
b2a4db28 | 918 | case TTEVT_FORK: |
3a3e9ee3 PA |
919 | related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid, |
920 | tts.tts_u.tts_fork.tts_flwpid, 0); | |
921 | ||
b2a4db28 | 922 | ourstatus->kind = TARGET_WAITKIND_FORKED; |
3a3e9ee3 | 923 | ourstatus->value.related_pid = related_ptid; |
b2a4db28 MK |
924 | |
925 | /* Make sure the other end of the fork is stopped too. */ | |
926 | if (ttrace_wait (tts.tts_u.tts_fork.tts_fpid, | |
927 | tts.tts_u.tts_fork.tts_flwpid, | |
928 | TTRACE_WAITOK, &tts, sizeof tts) == -1) | |
929 | perror_with_name (("ttrace_wait")); | |
930 | ||
931 | gdb_assert (tts.tts_event == TTEVT_FORK); | |
932 | if (tts.tts_u.tts_fork.tts_isparent) | |
933 | { | |
3a3e9ee3 PA |
934 | related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid, |
935 | tts.tts_u.tts_fork.tts_flwpid, 0); | |
b2a4db28 | 936 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); |
3a3e9ee3 | 937 | ourstatus->value.related_pid = related_ptid; |
b2a4db28 MK |
938 | } |
939 | break; | |
940 | ||
941 | case TTEVT_VFORK: | |
d83ad864 DB |
942 | if (tts.tts_u.tts_fork.tts_isparent) |
943 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; | |
944 | else | |
945 | { | |
946 | related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid, | |
947 | tts.tts_u.tts_fork.tts_flwpid, 0); | |
b2a4db28 | 948 | |
d83ad864 DB |
949 | ourstatus->kind = TARGET_WAITKIND_VFORKED; |
950 | ourstatus->value.related_pid = related_ptid; | |
951 | } | |
b2a4db28 MK |
952 | break; |
953 | ||
a7be7fa8 MK |
954 | case TTEVT_LWP_CREATE: |
955 | lwpid = tts.tts_u.tts_thread.tts_target_lwpid; | |
956 | ptid = ptid_build (tts.tts_pid, lwpid, 0); | |
60e2c248 JG |
957 | ti = add_thread (ptid); |
958 | ti->private = | |
959 | xmalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
960 | memset (ti->private, 0, | |
961 | sizeof (struct inf_ttrace_private_thread_info)); | |
a7be7fa8 MK |
962 | inf_ttrace_num_lwps++; |
963 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); | |
62a93fa9 PA |
964 | /* Let the lwp_create-caller thread continue. */ |
965 | ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid), | |
966 | ptid_get_lwp (ptid), TT_NOPC, 0, 0); | |
967 | /* Return without stopping the whole process. */ | |
968 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
969 | return ptid; | |
a7be7fa8 MK |
970 | |
971 | case TTEVT_LWP_EXIT: | |
17faa917 DJ |
972 | if (print_thread_events) |
973 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (ptid)); | |
e09875d4 | 974 | ti = find_thread_ptid (ptid); |
60e2c248 JG |
975 | gdb_assert (ti != NULL); |
976 | ((struct inf_ttrace_private_thread_info *)ti->private)->dying = 1; | |
a7be7fa8 | 977 | inf_ttrace_num_lwps--; |
62a93fa9 | 978 | /* Let the thread really exit. */ |
60e2c248 JG |
979 | ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid), |
980 | ptid_get_lwp (ptid), TT_NOPC, 0, 0); | |
62a93fa9 PA |
981 | /* Return without stopping the whole process. */ |
982 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
983 | return ptid; | |
a7be7fa8 MK |
984 | |
985 | case TTEVT_LWP_TERMINATE: | |
986 | lwpid = tts.tts_u.tts_thread.tts_target_lwpid; | |
987 | ptid = ptid_build (tts.tts_pid, lwpid, 0); | |
62a93fa9 | 988 | if (print_thread_events) |
b861ac81 | 989 | printf_unfiltered(_("[%s has been terminated]\n"), |
62a93fa9 | 990 | target_pid_to_str (ptid)); |
e09875d4 | 991 | ti = find_thread_ptid (ptid); |
60e2c248 JG |
992 | gdb_assert (ti != NULL); |
993 | ((struct inf_ttrace_private_thread_info *)ti->private)->dying = 1; | |
a7be7fa8 | 994 | inf_ttrace_num_lwps--; |
62a93fa9 PA |
995 | |
996 | /* Resume the lwp_terminate-caller thread. */ | |
a7be7fa8 | 997 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); |
62a93fa9 PA |
998 | ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid), |
999 | ptid_get_lwp (ptid), TT_NOPC, 0, 0); | |
1000 | /* Return without stopping the whole process. */ | |
1001 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
1002 | return ptid; | |
932936f0 | 1003 | |
eee22bf8 MK |
1004 | case TTEVT_SIGNAL: |
1005 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
1006 | ourstatus->value.sig = | |
2ea28649 | 1007 | gdb_signal_from_host (tts.tts_u.tts_signal.tts_signo); |
eee22bf8 | 1008 | break; |
932936f0 MK |
1009 | |
1010 | case TTEVT_SYSCALL_ENTRY: | |
1011 | gdb_assert (inf_ttrace_reenable_page_protections == 0); | |
a7be7fa8 MK |
1012 | inf_ttrace_num_lwps_in_syscall++; |
1013 | if (inf_ttrace_num_lwps_in_syscall == 1) | |
932936f0 MK |
1014 | { |
1015 | /* A thread has just entered a system call. Disable any | |
1016 | page protections as the kernel can't deal with them. */ | |
1017 | inf_ttrace_disable_page_protections (tts.tts_pid); | |
1018 | } | |
1019 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_ENTRY; | |
01dedca2 | 1020 | ourstatus->value.syscall_number = tts.tts_scno; |
932936f0 MK |
1021 | break; |
1022 | ||
1023 | case TTEVT_SYSCALL_RETURN: | |
a7be7fa8 | 1024 | if (inf_ttrace_num_lwps_in_syscall > 0) |
932936f0 MK |
1025 | { |
1026 | /* If the last thread has just left the system call, this | |
1027 | would be a logical place to re-enable the page | |
1028 | protections, but that doesn't work. We can't re-enable | |
1029 | them until we've done another wait. */ | |
1030 | inf_ttrace_reenable_page_protections = | |
a7be7fa8 MK |
1031 | (inf_ttrace_num_lwps_in_syscall == 1); |
1032 | inf_ttrace_num_lwps_in_syscall--; | |
932936f0 MK |
1033 | } |
1034 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_RETURN; | |
01dedca2 | 1035 | ourstatus->value.syscall_number = tts.tts_scno; |
932936f0 | 1036 | break; |
a7be7fa8 MK |
1037 | |
1038 | default: | |
1039 | gdb_assert (!"Unexpected ttrace event"); | |
1040 | break; | |
eee22bf8 MK |
1041 | } |
1042 | ||
1043 | /* Make sure all threads within the process are stopped. */ | |
1044 | if (ttrace (TT_PROC_STOP, tts.tts_pid, 0, 0, 0, 0) == -1) | |
e2e0b3e5 | 1045 | perror_with_name (("ttrace")); |
eee22bf8 | 1046 | |
438ac09b PA |
1047 | /* Now that the whole process is stopped, check if any dying thread |
1048 | is really dead by now. If a dying thread is still alive, it will | |
1049 | be stopped too, and will still show up in `info threads', tagged | |
1050 | with "(Exiting)". We could make `info threads' prune dead | |
1051 | threads instead via inf_ttrace_thread_alive, but doing this here | |
1052 | has the advantage that a frontend is notificed sooner of thread | |
1053 | exits. Note that a dying lwp is still alive, it still has to be | |
1054 | resumed, like any other lwp. */ | |
1055 | iterate_over_threads (inf_ttrace_delete_dead_threads_callback, NULL); | |
1056 | ||
a7be7fa8 | 1057 | return ptid; |
eee22bf8 MK |
1058 | } |
1059 | ||
1060 | /* Transfer LEN bytes from ADDR in the inferior's memory into READBUF, | |
1061 | and transfer LEN bytes from WRITEBUF into the inferior's memory at | |
1062 | ADDR. Either READBUF or WRITEBUF may be null, in which case the | |
1063 | corresponding transfer doesn't happen. Return the number of bytes | |
1064 | actually transferred (which may be zero if an error occurs). */ | |
1065 | ||
1066 | static LONGEST | |
1067 | inf_ttrace_xfer_memory (CORE_ADDR addr, ULONGEST len, | |
1068 | void *readbuf, const void *writebuf) | |
1069 | { | |
1070 | pid_t pid = ptid_get_pid (inferior_ptid); | |
1071 | ||
1072 | /* HP-UX treats text space and data space differently. GDB however, | |
1073 | doesn't really know the difference. Therefore we try both. Try | |
1074 | text space before data space though because when we're writing | |
1075 | into text space the instruction cache might need to be flushed. */ | |
1076 | ||
1077 | if (readbuf | |
1078 | && ttrace (TT_PROC_RDTEXT, pid, 0, addr, len, (uintptr_t)readbuf) == -1 | |
1079 | && ttrace (TT_PROC_RDDATA, pid, 0, addr, len, (uintptr_t)readbuf) == -1) | |
1080 | return 0; | |
1081 | ||
1082 | if (writebuf | |
1083 | && ttrace (TT_PROC_WRTEXT, pid, 0, addr, len, (uintptr_t)writebuf) == -1 | |
1084 | && ttrace (TT_PROC_WRDATA, pid, 0, addr, len, (uintptr_t)writebuf) == -1) | |
1085 | return 0; | |
1086 | ||
1087 | return len; | |
1088 | } | |
1089 | ||
9b409511 | 1090 | static enum target_xfer_status |
eee22bf8 | 1091 | inf_ttrace_xfer_partial (struct target_ops *ops, enum target_object object, |
7a4609f7 | 1092 | const char *annex, gdb_byte *readbuf, |
3e43a32a | 1093 | const gdb_byte *writebuf, |
9b409511 | 1094 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
eee22bf8 MK |
1095 | { |
1096 | switch (object) | |
1097 | { | |
1098 | case TARGET_OBJECT_MEMORY: | |
9b409511 YQ |
1099 | { |
1100 | LONGEST val = inf_ttrace_xfer_memory (offset, len, readbuf, writebuf); | |
1101 | ||
1102 | if (val == 0) | |
1103 | return TARGET_XFER_EOF; | |
1104 | else | |
1105 | { | |
1106 | *xfered_len = (ULONGEST) val; | |
1107 | return TARGET_XFER_OK; | |
1108 | } | |
1109 | } | |
eee22bf8 MK |
1110 | |
1111 | case TARGET_OBJECT_UNWIND_TABLE: | |
2ed4b548 | 1112 | return TARGET_XFER_E_IO; |
eee22bf8 MK |
1113 | |
1114 | case TARGET_OBJECT_AUXV: | |
2ed4b548 | 1115 | return TARGET_XFER_E_IO; |
eee22bf8 MK |
1116 | |
1117 | case TARGET_OBJECT_WCOOKIE: | |
2ed4b548 | 1118 | return TARGET_XFER_E_IO; |
eee22bf8 MK |
1119 | |
1120 | default: | |
2ed4b548 | 1121 | return TARGET_XFER_E_IO; |
eee22bf8 MK |
1122 | } |
1123 | } | |
1124 | ||
1125 | /* Print status information about what we're accessing. */ | |
1126 | ||
1127 | static void | |
1128 | inf_ttrace_files_info (struct target_ops *ignore) | |
1129 | { | |
181e7f93 | 1130 | struct inferior *inf = current_inferior (); |
346e281c | 1131 | printf_filtered (_("\tUsing the running image of %s %s.\n"), |
181e7f93 | 1132 | inf->attach_flag ? "attached" : "child", |
346e281c | 1133 | target_pid_to_str (inferior_ptid)); |
eee22bf8 | 1134 | } |
a7be7fa8 MK |
1135 | |
1136 | static int | |
28439f5e | 1137 | inf_ttrace_thread_alive (struct target_ops *ops, ptid_t ptid) |
a7be7fa8 | 1138 | { |
438ac09b PA |
1139 | return 1; |
1140 | } | |
1141 | ||
1142 | /* Return a string describing the state of the thread specified by | |
1143 | INFO. */ | |
1144 | ||
1145 | static char * | |
c15906d8 TT |
1146 | inf_ttrace_extra_thread_info (struct target_ops *self, |
1147 | struct thread_info *info) | |
438ac09b PA |
1148 | { |
1149 | struct inf_ttrace_private_thread_info* private = | |
1150 | (struct inf_ttrace_private_thread_info *) info->private; | |
1151 | ||
1152 | if (private != NULL && private->dying) | |
1153 | return "Exiting"; | |
1154 | ||
1155 | return NULL; | |
a7be7fa8 MK |
1156 | } |
1157 | ||
1158 | static char * | |
117de6a9 | 1159 | inf_ttrace_pid_to_str (struct target_ops *ops, ptid_t ptid) |
a7be7fa8 | 1160 | { |
2935f27f PA |
1161 | pid_t pid = ptid_get_pid (ptid); |
1162 | lwpid_t lwpid = ptid_get_lwp (ptid); | |
1163 | static char buf[128]; | |
a7be7fa8 | 1164 | |
2935f27f PA |
1165 | if (lwpid == 0) |
1166 | xsnprintf (buf, sizeof buf, "process %ld", | |
1167 | (long) pid); | |
1168 | else | |
1169 | xsnprintf (buf, sizeof buf, "process %ld, lwp %ld", | |
1170 | (long) pid, (long) lwpid); | |
1171 | return buf; | |
a7be7fa8 | 1172 | } |
eee22bf8 MK |
1173 | \f |
1174 | ||
fa07e785 JB |
1175 | /* Implement the get_ada_task_ptid target_ops method. */ |
1176 | ||
1177 | static ptid_t | |
1e6b91a4 | 1178 | inf_ttrace_get_ada_task_ptid (struct target_ops *self, long lwp, long thread) |
fa07e785 JB |
1179 | { |
1180 | return ptid_build (ptid_get_pid (inferior_ptid), lwp, 0); | |
1181 | } | |
1182 | ||
1183 | \f | |
eee22bf8 MK |
1184 | struct target_ops * |
1185 | inf_ttrace_target (void) | |
1186 | { | |
1187 | struct target_ops *t = inf_child_target (); | |
1188 | ||
eee22bf8 MK |
1189 | t->to_attach = inf_ttrace_attach; |
1190 | t->to_detach = inf_ttrace_detach; | |
1191 | t->to_resume = inf_ttrace_resume; | |
1192 | t->to_wait = inf_ttrace_wait; | |
eee22bf8 | 1193 | t->to_files_info = inf_ttrace_files_info; |
932936f0 | 1194 | t->to_can_use_hw_breakpoint = inf_ttrace_can_use_hw_breakpoint; |
932936f0 MK |
1195 | t->to_insert_watchpoint = inf_ttrace_insert_watchpoint; |
1196 | t->to_remove_watchpoint = inf_ttrace_remove_watchpoint; | |
1197 | t->to_stopped_by_watchpoint = inf_ttrace_stopped_by_watchpoint; | |
2a3cdf79 WZ |
1198 | t->to_region_ok_for_hw_watchpoint = |
1199 | inf_ttrace_region_ok_for_hw_watchpoint; | |
346e281c MK |
1200 | t->to_kill = inf_ttrace_kill; |
1201 | t->to_create_inferior = inf_ttrace_create_inferior; | |
1202 | t->to_follow_fork = inf_ttrace_follow_fork; | |
1203 | t->to_mourn_inferior = inf_ttrace_mourn_inferior; | |
1204 | t->to_thread_alive = inf_ttrace_thread_alive; | |
438ac09b | 1205 | t->to_extra_thread_info = inf_ttrace_extra_thread_info; |
346e281c MK |
1206 | t->to_pid_to_str = inf_ttrace_pid_to_str; |
1207 | t->to_xfer_partial = inf_ttrace_xfer_partial; | |
fa07e785 | 1208 | t->to_get_ada_task_ptid = inf_ttrace_get_ada_task_ptid; |
eee22bf8 | 1209 | |
eee22bf8 MK |
1210 | return t; |
1211 | } | |
d3322e8a | 1212 | #endif |
932936f0 MK |
1213 | \f |
1214 | ||
1215 | /* Prevent warning from -Wmissing-prototypes. */ | |
0b155465 | 1216 | void _initialize_inf_ttrace (void); |
eee22bf8 | 1217 | |
932936f0 MK |
1218 | void |
1219 | _initialize_inf_ttrace (void) | |
1220 | { | |
d3322e8a | 1221 | #ifdef HAVE_TTRACE |
932936f0 | 1222 | inf_ttrace_page_dict.pagesize = getpagesize(); |
eee22bf8 | 1223 | #endif |
d3322e8a | 1224 | } |