Commit | Line | Data |
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eee22bf8 MK |
1 | /* Low-level child interface to ttrace. |
2 | ||
28e7fd62 | 3 | Copyright (C) 2004-2013 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 MK |
31 | #include "target.h" |
32 | ||
33 | #include "gdb_assert.h" | |
34 | #include "gdb_string.h" | |
932936f0 | 35 | #include <sys/mman.h> |
eee22bf8 | 36 | #include <sys/ttrace.h> |
438ac09b | 37 | #include <signal.h> |
eee22bf8 MK |
38 | |
39 | #include "inf-child.h" | |
40 | #include "inf-ttrace.h" | |
21ff4686 | 41 | #include "common/filestuff.h" |
eee22bf8 | 42 | |
932936f0 MK |
43 | \f |
44 | ||
a7be7fa8 MK |
45 | /* HP-UX uses a threading model where each user-space thread |
46 | corresponds to a kernel thread. These kernel threads are called | |
47 | lwps. The ttrace(2) interface gives us almost full control over | |
48 | the threads, which makes it very easy to support them in GDB. We | |
49 | identify the threads by process ID and lwp ID. The ttrace(2) also | |
50 | provides us with a thread's user ID (in the `tts_user_tid' member | |
51 | of `ttstate_t') but we don't use that (yet) as it isn't necessary | |
52 | to uniquely label the thread. */ | |
53 | ||
54 | /* Number of active lwps. */ | |
55 | static int inf_ttrace_num_lwps; | |
56 | \f | |
57 | ||
932936f0 MK |
58 | /* On HP-UX versions that have the ttrace(2) system call, we can |
59 | implement "hardware" watchpoints by fiddling with the protection of | |
60 | pages in the address space that contain the variable being watched. | |
61 | In order to implement this, we keep a dictionary of pages for which | |
62 | we have changed the protection. */ | |
63 | ||
64 | struct inf_ttrace_page | |
65 | { | |
66 | CORE_ADDR addr; /* Page address. */ | |
67 | int prot; /* Protection. */ | |
68 | int refcount; /* Reference count. */ | |
69 | struct inf_ttrace_page *next; | |
70 | struct inf_ttrace_page *prev; | |
71 | }; | |
72 | ||
73 | struct inf_ttrace_page_dict | |
74 | { | |
75 | struct inf_ttrace_page buckets[128]; | |
76 | int pagesize; /* Page size. */ | |
77 | int count; /* Number of pages in this dictionary. */ | |
78 | } inf_ttrace_page_dict; | |
79 | ||
60e2c248 JG |
80 | struct inf_ttrace_private_thread_info |
81 | { | |
82 | int dying; | |
83 | }; | |
84 | ||
a7be7fa8 MK |
85 | /* Number of lwps that are currently in a system call. */ |
86 | static int inf_ttrace_num_lwps_in_syscall; | |
932936f0 MK |
87 | |
88 | /* Flag to indicate whether we should re-enable page protections after | |
89 | the next wait. */ | |
90 | static int inf_ttrace_reenable_page_protections; | |
91 | ||
92 | /* Enable system call events for process PID. */ | |
93 | ||
94 | static void | |
95 | inf_ttrace_enable_syscall_events (pid_t pid) | |
96 | { | |
97 | ttevent_t tte; | |
98 | ttstate_t tts; | |
99 | ||
a7be7fa8 | 100 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); |
932936f0 MK |
101 | |
102 | if (ttrace (TT_PROC_GET_EVENT_MASK, pid, 0, | |
103 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 104 | perror_with_name (("ttrace")); |
932936f0 MK |
105 | |
106 | tte.tte_events |= (TTEVT_SYSCALL_ENTRY | TTEVT_SYSCALL_RETURN); | |
107 | ||
108 | if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, | |
109 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 110 | perror_with_name (("ttrace")); |
932936f0 MK |
111 | |
112 | if (ttrace (TT_PROC_GET_FIRST_LWP_STATE, pid, 0, | |
113 | (uintptr_t)&tts, sizeof tts, 0) == -1) | |
e2e0b3e5 | 114 | perror_with_name (("ttrace")); |
932936f0 MK |
115 | |
116 | if (tts.tts_flags & TTS_INSYSCALL) | |
a7be7fa8 | 117 | inf_ttrace_num_lwps_in_syscall++; |
932936f0 MK |
118 | |
119 | /* FIXME: Handle multiple threads. */ | |
120 | } | |
121 | ||
122 | /* Disable system call events for process PID. */ | |
123 | ||
124 | static void | |
125 | inf_ttrace_disable_syscall_events (pid_t pid) | |
126 | { | |
127 | ttevent_t tte; | |
128 | ||
129 | gdb_assert (inf_ttrace_page_dict.count == 0); | |
130 | ||
131 | if (ttrace (TT_PROC_GET_EVENT_MASK, pid, 0, | |
132 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 133 | perror_with_name (("ttrace")); |
932936f0 MK |
134 | |
135 | tte.tte_events &= ~(TTEVT_SYSCALL_ENTRY | TTEVT_SYSCALL_RETURN); | |
136 | ||
137 | if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, | |
138 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 139 | perror_with_name (("ttrace")); |
932936f0 | 140 | |
a7be7fa8 | 141 | inf_ttrace_num_lwps_in_syscall = 0; |
932936f0 MK |
142 | } |
143 | ||
144 | /* Get information about the page at address ADDR for process PID from | |
145 | the dictionary. */ | |
146 | ||
147 | static struct inf_ttrace_page * | |
148 | inf_ttrace_get_page (pid_t pid, CORE_ADDR addr) | |
149 | { | |
150 | const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets); | |
151 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
152 | int bucket; | |
153 | struct inf_ttrace_page *page; | |
154 | ||
155 | bucket = (addr / pagesize) % num_buckets; | |
156 | page = &inf_ttrace_page_dict.buckets[bucket]; | |
157 | while (page) | |
158 | { | |
159 | if (page->addr == addr) | |
160 | break; | |
161 | ||
162 | page = page->next; | |
163 | } | |
164 | ||
165 | return page; | |
166 | } | |
167 | ||
168 | /* Add the page at address ADDR for process PID to the dictionary. */ | |
169 | ||
170 | static struct inf_ttrace_page * | |
171 | inf_ttrace_add_page (pid_t pid, CORE_ADDR addr) | |
172 | { | |
173 | const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets); | |
174 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
175 | int bucket; | |
176 | struct inf_ttrace_page *page; | |
177 | struct inf_ttrace_page *prev = NULL; | |
178 | ||
179 | bucket = (addr / pagesize) % num_buckets; | |
180 | page = &inf_ttrace_page_dict.buckets[bucket]; | |
181 | while (page) | |
182 | { | |
183 | if (page->addr == addr) | |
184 | break; | |
185 | ||
186 | prev = page; | |
187 | page = page->next; | |
188 | } | |
189 | ||
190 | if (!page) | |
191 | { | |
192 | int prot; | |
193 | ||
194 | if (ttrace (TT_PROC_GET_MPROTECT, pid, 0, | |
195 | addr, 0, (uintptr_t)&prot) == -1) | |
e2e0b3e5 | 196 | perror_with_name (("ttrace")); |
932936f0 MK |
197 | |
198 | page = XMALLOC (struct inf_ttrace_page); | |
199 | page->addr = addr; | |
200 | page->prot = prot; | |
201 | page->refcount = 0; | |
202 | page->next = NULL; | |
203 | ||
204 | page->prev = prev; | |
205 | prev->next = page; | |
206 | ||
207 | inf_ttrace_page_dict.count++; | |
208 | if (inf_ttrace_page_dict.count == 1) | |
209 | inf_ttrace_enable_syscall_events (pid); | |
210 | ||
a7be7fa8 | 211 | if (inf_ttrace_num_lwps_in_syscall == 0) |
932936f0 MK |
212 | { |
213 | if (ttrace (TT_PROC_SET_MPROTECT, pid, 0, | |
214 | addr, pagesize, prot & ~PROT_WRITE) == -1) | |
e2e0b3e5 | 215 | perror_with_name (("ttrace")); |
932936f0 MK |
216 | } |
217 | } | |
218 | ||
219 | return page; | |
220 | } | |
221 | ||
222 | /* Insert the page at address ADDR of process PID to the dictionary. */ | |
223 | ||
224 | static void | |
225 | inf_ttrace_insert_page (pid_t pid, CORE_ADDR addr) | |
226 | { | |
227 | struct inf_ttrace_page *page; | |
228 | ||
229 | page = inf_ttrace_get_page (pid, addr); | |
230 | if (!page) | |
231 | page = inf_ttrace_add_page (pid, addr); | |
232 | ||
233 | page->refcount++; | |
234 | } | |
235 | ||
236 | /* Remove the page at address ADDR of process PID from the dictionary. */ | |
237 | ||
238 | static void | |
239 | inf_ttrace_remove_page (pid_t pid, CORE_ADDR addr) | |
240 | { | |
241 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
242 | struct inf_ttrace_page *page; | |
243 | ||
244 | page = inf_ttrace_get_page (pid, addr); | |
245 | page->refcount--; | |
246 | ||
247 | gdb_assert (page->refcount >= 0); | |
248 | ||
249 | if (page->refcount == 0) | |
250 | { | |
a7be7fa8 | 251 | if (inf_ttrace_num_lwps_in_syscall == 0) |
932936f0 MK |
252 | { |
253 | if (ttrace (TT_PROC_SET_MPROTECT, pid, 0, | |
254 | addr, pagesize, page->prot) == -1) | |
e2e0b3e5 | 255 | perror_with_name (("ttrace")); |
932936f0 MK |
256 | } |
257 | ||
258 | inf_ttrace_page_dict.count--; | |
259 | if (inf_ttrace_page_dict.count == 0) | |
260 | inf_ttrace_disable_syscall_events (pid); | |
261 | ||
262 | page->prev->next = page->next; | |
263 | if (page->next) | |
264 | page->next->prev = page->prev; | |
265 | ||
266 | xfree (page); | |
267 | } | |
268 | } | |
269 | ||
270 | /* Mask the bits in PROT from the page protections that are currently | |
271 | in the dictionary for process PID. */ | |
272 | ||
273 | static void | |
274 | inf_ttrace_mask_page_protections (pid_t pid, int prot) | |
275 | { | |
276 | const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets); | |
277 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
278 | int bucket; | |
279 | ||
280 | for (bucket = 0; bucket < num_buckets; bucket++) | |
281 | { | |
282 | struct inf_ttrace_page *page; | |
283 | ||
284 | page = inf_ttrace_page_dict.buckets[bucket].next; | |
285 | while (page) | |
286 | { | |
287 | if (ttrace (TT_PROC_SET_MPROTECT, pid, 0, | |
288 | page->addr, pagesize, page->prot & ~prot) == -1) | |
e2e0b3e5 | 289 | perror_with_name (("ttrace")); |
932936f0 MK |
290 | |
291 | page = page->next; | |
292 | } | |
293 | } | |
294 | } | |
295 | ||
296 | /* Write-protect the pages in the dictionary for process PID. */ | |
297 | ||
298 | static void | |
299 | inf_ttrace_enable_page_protections (pid_t pid) | |
300 | { | |
301 | inf_ttrace_mask_page_protections (pid, PROT_WRITE); | |
302 | } | |
303 | ||
304 | /* Restore the protection of the pages in the dictionary for process | |
305 | PID. */ | |
306 | ||
307 | static void | |
308 | inf_ttrace_disable_page_protections (pid_t pid) | |
309 | { | |
310 | inf_ttrace_mask_page_protections (pid, 0); | |
311 | } | |
312 | ||
313 | /* Insert a "hardware" watchpoint for LEN bytes at address ADDR of | |
314 | type TYPE. */ | |
315 | ||
316 | static int | |
0cf6dd15 TJB |
317 | inf_ttrace_insert_watchpoint (CORE_ADDR addr, int len, int type, |
318 | struct expression *cond) | |
932936f0 MK |
319 | { |
320 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
321 | pid_t pid = ptid_get_pid (inferior_ptid); | |
322 | CORE_ADDR page_addr; | |
323 | int num_pages; | |
324 | int page; | |
325 | ||
326 | gdb_assert (type == hw_write); | |
327 | ||
328 | page_addr = (addr / pagesize) * pagesize; | |
329 | num_pages = (len + pagesize - 1) / pagesize; | |
330 | ||
331 | for (page = 0; page < num_pages; page++, page_addr += pagesize) | |
332 | inf_ttrace_insert_page (pid, page_addr); | |
333 | ||
334 | return 1; | |
335 | } | |
336 | ||
337 | /* Remove a "hardware" watchpoint for LEN bytes at address ADDR of | |
338 | type TYPE. */ | |
339 | ||
340 | static int | |
0cf6dd15 TJB |
341 | inf_ttrace_remove_watchpoint (CORE_ADDR addr, int len, int type, |
342 | struct expression *cond) | |
932936f0 MK |
343 | { |
344 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
345 | pid_t pid = ptid_get_pid (inferior_ptid); | |
346 | CORE_ADDR page_addr; | |
347 | int num_pages; | |
348 | int page; | |
349 | ||
350 | gdb_assert (type == hw_write); | |
351 | ||
352 | page_addr = (addr / pagesize) * pagesize; | |
353 | num_pages = (len + pagesize - 1) / pagesize; | |
354 | ||
355 | for (page = 0; page < num_pages; page++, page_addr += pagesize) | |
356 | inf_ttrace_remove_page (pid, page_addr); | |
357 | ||
358 | return 1; | |
359 | } | |
360 | ||
361 | static int | |
362 | inf_ttrace_can_use_hw_breakpoint (int type, int len, int ot) | |
363 | { | |
364 | return (type == bp_hardware_watchpoint); | |
365 | } | |
366 | ||
367 | static int | |
2a3cdf79 | 368 | inf_ttrace_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len) |
932936f0 MK |
369 | { |
370 | return 1; | |
371 | } | |
372 | ||
373 | /* Return non-zero if the current inferior was (potentially) stopped | |
374 | by hitting a "hardware" watchpoint. */ | |
375 | ||
376 | static int | |
377 | inf_ttrace_stopped_by_watchpoint (void) | |
378 | { | |
379 | pid_t pid = ptid_get_pid (inferior_ptid); | |
380 | lwpid_t lwpid = ptid_get_lwp (inferior_ptid); | |
381 | ttstate_t tts; | |
382 | ||
383 | if (inf_ttrace_page_dict.count > 0) | |
384 | { | |
385 | if (ttrace (TT_LWP_GET_STATE, pid, lwpid, | |
386 | (uintptr_t)&tts, sizeof tts, 0) == -1) | |
e2e0b3e5 | 387 | perror_with_name (("ttrace")); |
932936f0 MK |
388 | |
389 | if (tts.tts_event == TTEVT_SIGNAL | |
390 | && tts.tts_u.tts_signal.tts_signo == SIGBUS) | |
391 | { | |
392 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
393 | void *addr = tts.tts_u.tts_signal.tts_siginfo.si_addr; | |
394 | CORE_ADDR page_addr = ((uintptr_t)addr / pagesize) * pagesize; | |
395 | ||
396 | if (inf_ttrace_get_page (pid, page_addr)) | |
397 | return 1; | |
398 | } | |
399 | } | |
400 | ||
401 | return 0; | |
402 | } | |
403 | \f | |
eee22bf8 | 404 | |
b2a4db28 MK |
405 | /* When tracking a vfork(2), we cannot detach from the parent until |
406 | after the child has called exec(3) or has exited. If we are still | |
407 | attached to the parent, this variable will be set to the process ID | |
408 | of the parent. Otherwise it will be set to zero. */ | |
409 | static pid_t inf_ttrace_vfork_ppid = -1; | |
410 | ||
411 | static int | |
ee057212 | 412 | inf_ttrace_follow_fork (struct target_ops *ops, int follow_child) |
b2a4db28 MK |
413 | { |
414 | pid_t pid, fpid; | |
415 | lwpid_t lwpid, flwpid; | |
416 | ttstate_t tts; | |
e58b0e63 PA |
417 | struct thread_info *tp = inferior_thread (); |
418 | ||
419 | gdb_assert (tp->pending_follow.kind == TARGET_WAITKIND_FORKED | |
420 | || tp->pending_follow.kind == TARGET_WAITKIND_VFORKED); | |
421 | ||
422 | pid = ptid_get_pid (inferior_ptid); | |
423 | lwpid = ptid_get_lwp (inferior_ptid); | |
b2a4db28 MK |
424 | |
425 | /* Get all important details that core GDB doesn't (and shouldn't) | |
426 | know about. */ | |
427 | if (ttrace (TT_LWP_GET_STATE, pid, lwpid, | |
428 | (uintptr_t)&tts, sizeof tts, 0) == -1) | |
429 | perror_with_name (("ttrace")); | |
430 | ||
431 | gdb_assert (tts.tts_event == TTEVT_FORK || tts.tts_event == TTEVT_VFORK); | |
432 | ||
433 | if (tts.tts_u.tts_fork.tts_isparent) | |
434 | { | |
435 | pid = tts.tts_pid; | |
436 | lwpid = tts.tts_lwpid; | |
437 | fpid = tts.tts_u.tts_fork.tts_fpid; | |
438 | flwpid = tts.tts_u.tts_fork.tts_flwpid; | |
439 | } | |
440 | else | |
441 | { | |
442 | pid = tts.tts_u.tts_fork.tts_fpid; | |
443 | lwpid = tts.tts_u.tts_fork.tts_flwpid; | |
444 | fpid = tts.tts_pid; | |
445 | flwpid = tts.tts_lwpid; | |
446 | } | |
447 | ||
448 | if (follow_child) | |
449 | { | |
77435e4c | 450 | struct inferior *inf; |
191c4426 PA |
451 | struct inferior *parent_inf; |
452 | ||
453 | parent_inf = find_inferior_pid (pid); | |
77435e4c | 454 | |
b2a4db28 | 455 | inferior_ptid = ptid_build (fpid, flwpid, 0); |
77435e4c | 456 | inf = add_inferior (fpid); |
191c4426 | 457 | inf->attach_flag = parent_inf->attach_flag; |
6c95b8df PA |
458 | inf->pspace = parent_inf->pspace; |
459 | inf->aspace = parent_inf->aspace; | |
191c4426 | 460 | copy_terminal_info (inf, parent_inf); |
d80ee84f | 461 | detach_breakpoints (ptid_build (pid, lwpid, 0)); |
b2a4db28 MK |
462 | |
463 | target_terminal_ours (); | |
3e43a32a MS |
464 | fprintf_unfiltered (gdb_stdlog, |
465 | _("Attaching after fork to child process %ld.\n"), | |
466 | (long)fpid); | |
b2a4db28 MK |
467 | } |
468 | else | |
469 | { | |
470 | inferior_ptid = ptid_build (pid, lwpid, 0); | |
2dcc6086 JB |
471 | /* Detach any remaining breakpoints in the child. In the case |
472 | of fork events, we do not need to do this, because breakpoints | |
473 | should have already been removed earlier. */ | |
474 | if (tts.tts_event == TTEVT_VFORK) | |
d80ee84f | 475 | detach_breakpoints (ptid_build (fpid, flwpid, 0)); |
b2a4db28 MK |
476 | |
477 | target_terminal_ours (); | |
3e43a32a MS |
478 | fprintf_unfiltered (gdb_stdlog, |
479 | _("Detaching after fork from child process %ld.\n"), | |
480 | (long)fpid); | |
b2a4db28 MK |
481 | } |
482 | ||
483 | if (tts.tts_event == TTEVT_VFORK) | |
484 | { | |
485 | gdb_assert (!tts.tts_u.tts_fork.tts_isparent); | |
486 | ||
487 | if (follow_child) | |
488 | { | |
489 | /* We can't detach from the parent yet. */ | |
490 | inf_ttrace_vfork_ppid = pid; | |
491 | ||
492 | reattach_breakpoints (fpid); | |
493 | } | |
494 | else | |
495 | { | |
496 | if (ttrace (TT_PROC_DETACH, fpid, 0, 0, 0, 0) == -1) | |
497 | perror_with_name (("ttrace")); | |
498 | ||
499 | /* Wait till we get the TTEVT_VFORK event in the parent. | |
500 | This indicates that the child has called exec(3) or has | |
501 | exited and that the parent is ready to be traced again. */ | |
502 | if (ttrace_wait (pid, lwpid, TTRACE_WAITOK, &tts, sizeof tts) == -1) | |
503 | perror_with_name (("ttrace_wait")); | |
504 | gdb_assert (tts.tts_event == TTEVT_VFORK); | |
505 | gdb_assert (tts.tts_u.tts_fork.tts_isparent); | |
506 | ||
507 | reattach_breakpoints (pid); | |
508 | } | |
509 | } | |
510 | else | |
511 | { | |
512 | gdb_assert (tts.tts_u.tts_fork.tts_isparent); | |
513 | ||
514 | if (follow_child) | |
515 | { | |
516 | if (ttrace (TT_PROC_DETACH, pid, 0, 0, 0, 0) == -1) | |
517 | perror_with_name (("ttrace")); | |
518 | } | |
519 | else | |
520 | { | |
521 | if (ttrace (TT_PROC_DETACH, fpid, 0, 0, 0, 0) == -1) | |
522 | perror_with_name (("ttrace")); | |
523 | } | |
524 | } | |
525 | ||
526 | if (follow_child) | |
527 | { | |
2935f27f PA |
528 | struct thread_info *ti; |
529 | ||
b2a4db28 | 530 | /* The child will start out single-threaded. */ |
2935f27f | 531 | inf_ttrace_num_lwps = 1; |
b2a4db28 MK |
532 | inf_ttrace_num_lwps_in_syscall = 0; |
533 | ||
2935f27f PA |
534 | /* Delete parent. */ |
535 | delete_thread_silent (ptid_build (pid, lwpid, 0)); | |
7f9f62ba | 536 | detach_inferior (pid); |
2935f27f | 537 | |
7f9f62ba | 538 | /* Add child thread. inferior_ptid was already set above. */ |
2935f27f PA |
539 | ti = add_thread_silent (inferior_ptid); |
540 | ti->private = | |
541 | xmalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
542 | memset (ti->private, 0, | |
543 | sizeof (struct inf_ttrace_private_thread_info)); | |
b2a4db28 MK |
544 | } |
545 | ||
546 | return 0; | |
547 | } | |
548 | \f | |
549 | ||
eee22bf8 MK |
550 | /* File descriptors for pipes used as semaphores during initial |
551 | startup of an inferior. */ | |
552 | static int inf_ttrace_pfd1[2]; | |
553 | static int inf_ttrace_pfd2[2]; | |
554 | ||
555 | static void | |
556 | do_cleanup_pfds (void *dummy) | |
557 | { | |
558 | close (inf_ttrace_pfd1[0]); | |
559 | close (inf_ttrace_pfd1[1]); | |
560 | close (inf_ttrace_pfd2[0]); | |
561 | close (inf_ttrace_pfd2[1]); | |
21ff4686 TT |
562 | |
563 | unmark_fd_no_cloexec (inf_ttrace_pfd1[0]); | |
564 | unmark_fd_no_cloexec (inf_ttrace_pfd1[1]); | |
565 | unmark_fd_no_cloexec (inf_ttrace_pfd2[0]); | |
566 | unmark_fd_no_cloexec (inf_ttrace_pfd2[1]); | |
eee22bf8 MK |
567 | } |
568 | ||
569 | static void | |
570 | inf_ttrace_prepare (void) | |
571 | { | |
572 | if (pipe (inf_ttrace_pfd1) == -1) | |
a3f17187 | 573 | perror_with_name (("pipe")); |
eee22bf8 MK |
574 | |
575 | if (pipe (inf_ttrace_pfd2) == -1) | |
576 | { | |
577 | close (inf_ttrace_pfd1[0]); | |
578 | close (inf_ttrace_pfd2[0]); | |
a3f17187 | 579 | perror_with_name (("pipe")); |
eee22bf8 | 580 | } |
21ff4686 TT |
581 | |
582 | mark_fd_no_cloexec (inf_ttrace_pfd1[0]); | |
583 | mark_fd_no_cloexec (inf_ttrace_pfd1[1]); | |
584 | mark_fd_no_cloexec (inf_ttrace_pfd2[0]); | |
585 | mark_fd_no_cloexec (inf_ttrace_pfd2[1]); | |
eee22bf8 MK |
586 | } |
587 | ||
588 | /* Prepare to be traced. */ | |
589 | ||
590 | static void | |
591 | inf_ttrace_me (void) | |
592 | { | |
593 | struct cleanup *old_chain = make_cleanup (do_cleanup_pfds, 0); | |
594 | char c; | |
595 | ||
596 | /* "Trace me, Dr. Memory!" */ | |
597 | if (ttrace (TT_PROC_SETTRC, 0, 0, 0, TT_VERSION, 0) == -1) | |
e2e0b3e5 | 598 | perror_with_name (("ttrace")); |
eee22bf8 MK |
599 | |
600 | /* Tell our parent that we are ready to be traced. */ | |
601 | if (write (inf_ttrace_pfd1[1], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 602 | perror_with_name (("write")); |
eee22bf8 MK |
603 | |
604 | /* Wait until our parent has set the initial event mask. */ | |
605 | if (read (inf_ttrace_pfd2[0], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 606 | perror_with_name (("read")); |
eee22bf8 MK |
607 | |
608 | do_cleanups (old_chain); | |
609 | } | |
610 | ||
611 | /* Start tracing PID. */ | |
612 | ||
613 | static void | |
28439f5e | 614 | inf_ttrace_him (struct target_ops *ops, int pid) |
eee22bf8 MK |
615 | { |
616 | struct cleanup *old_chain = make_cleanup (do_cleanup_pfds, 0); | |
617 | ttevent_t tte; | |
eee22bf8 MK |
618 | char c; |
619 | ||
620 | /* Wait until our child is ready to be traced. */ | |
621 | if (read (inf_ttrace_pfd1[0], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 622 | perror_with_name (("read")); |
eee22bf8 MK |
623 | |
624 | /* Set the initial event mask. */ | |
625 | memset (&tte, 0, sizeof (tte)); | |
b2a4db28 | 626 | tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT | TTEVT_FORK | TTEVT_VFORK; |
a7be7fa8 | 627 | tte.tte_events |= TTEVT_LWP_CREATE | TTEVT_LWP_EXIT | TTEVT_LWP_TERMINATE; |
7ba0e0c2 MK |
628 | #ifdef TTEVT_BPT_SSTEP |
629 | tte.tte_events |= TTEVT_BPT_SSTEP; | |
630 | #endif | |
b2a4db28 | 631 | tte.tte_opts |= TTEO_PROC_INHERIT; |
eee22bf8 MK |
632 | if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, |
633 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 634 | perror_with_name (("ttrace")); |
eee22bf8 MK |
635 | |
636 | /* Tell our child that we have set the initial event mask. */ | |
637 | if (write (inf_ttrace_pfd2[1], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 638 | perror_with_name (("write")); |
eee22bf8 MK |
639 | |
640 | do_cleanups (old_chain); | |
641 | ||
28439f5e | 642 | push_target (ops); |
eee22bf8 | 643 | |
eee22bf8 MK |
644 | /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h, and will |
645 | be 1 or 2 depending on whether we're starting without or with a | |
646 | shell. */ | |
647 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); | |
648 | ||
649 | /* On some targets, there must be some explicit actions taken after | |
650 | the inferior has been started up. */ | |
651 | target_post_startup_inferior (pid_to_ptid (pid)); | |
652 | } | |
653 | ||
654 | static void | |
136d6dae VP |
655 | inf_ttrace_create_inferior (struct target_ops *ops, char *exec_file, |
656 | char *allargs, char **env, int from_tty) | |
eee22bf8 | 657 | { |
28439f5e PA |
658 | int pid; |
659 | ||
a7be7fa8 MK |
660 | gdb_assert (inf_ttrace_num_lwps == 0); |
661 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); | |
932936f0 | 662 | gdb_assert (inf_ttrace_page_dict.count == 0); |
932936f0 | 663 | gdb_assert (inf_ttrace_reenable_page_protections == 0); |
b2a4db28 | 664 | gdb_assert (inf_ttrace_vfork_ppid == -1); |
932936f0 | 665 | |
28439f5e | 666 | pid = fork_inferior (exec_file, allargs, env, inf_ttrace_me, NULL, |
e69860f1 | 667 | inf_ttrace_prepare, NULL, NULL); |
28439f5e PA |
668 | |
669 | inf_ttrace_him (ops, pid); | |
eee22bf8 MK |
670 | } |
671 | ||
eee22bf8 | 672 | static void |
136d6dae | 673 | inf_ttrace_mourn_inferior (struct target_ops *ops) |
eee22bf8 | 674 | { |
932936f0 MK |
675 | const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets); |
676 | int bucket; | |
677 | ||
a7be7fa8 MK |
678 | inf_ttrace_num_lwps = 0; |
679 | inf_ttrace_num_lwps_in_syscall = 0; | |
932936f0 MK |
680 | |
681 | for (bucket = 0; bucket < num_buckets; bucket++) | |
682 | { | |
683 | struct inf_ttrace_page *page; | |
684 | struct inf_ttrace_page *next; | |
685 | ||
686 | page = inf_ttrace_page_dict.buckets[bucket].next; | |
687 | while (page) | |
688 | { | |
689 | next = page->next; | |
690 | xfree (page); | |
691 | page = next; | |
692 | } | |
693 | } | |
694 | inf_ttrace_page_dict.count = 0; | |
695 | ||
28439f5e | 696 | unpush_target (ops); |
eee22bf8 MK |
697 | generic_mourn_inferior (); |
698 | } | |
699 | ||
f688d93f JB |
700 | /* Assuming we just attached the debugger to a new inferior, create |
701 | a new thread_info structure for each thread, and add it to our | |
702 | list of threads. */ | |
703 | ||
704 | static void | |
705 | inf_ttrace_create_threads_after_attach (int pid) | |
706 | { | |
707 | int status; | |
708 | ptid_t ptid; | |
709 | ttstate_t tts; | |
710 | struct thread_info *ti; | |
711 | ||
712 | status = ttrace (TT_PROC_GET_FIRST_LWP_STATE, pid, 0, | |
713 | (uintptr_t) &tts, sizeof (ttstate_t), 0); | |
714 | if (status < 0) | |
715 | perror_with_name (_("TT_PROC_GET_FIRST_LWP_STATE ttrace call failed")); | |
716 | gdb_assert (tts.tts_pid == pid); | |
717 | ||
718 | /* Add the stopped thread. */ | |
719 | ptid = ptid_build (pid, tts.tts_lwpid, 0); | |
720 | ti = add_thread (ptid); | |
721 | ti->private = xzalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
722 | inf_ttrace_num_lwps++; | |
723 | ||
724 | /* We use the "first stopped thread" as the currently active thread. */ | |
725 | inferior_ptid = ptid; | |
726 | ||
727 | /* Iterative over all the remaining threads. */ | |
728 | ||
729 | for (;;) | |
730 | { | |
731 | ptid_t ptid; | |
732 | ||
733 | status = ttrace (TT_PROC_GET_NEXT_LWP_STATE, pid, 0, | |
734 | (uintptr_t) &tts, sizeof (ttstate_t), 0); | |
735 | if (status < 0) | |
736 | perror_with_name (_("TT_PROC_GET_NEXT_LWP_STATE ttrace call failed")); | |
737 | if (status == 0) | |
738 | break; /* End of list. */ | |
739 | ||
740 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); | |
741 | ti = add_thread (ptid); | |
742 | ti->private = xzalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
743 | inf_ttrace_num_lwps++; | |
744 | } | |
745 | } | |
746 | ||
eee22bf8 | 747 | static void |
136d6dae | 748 | inf_ttrace_attach (struct target_ops *ops, char *args, int from_tty) |
eee22bf8 MK |
749 | { |
750 | char *exec_file; | |
751 | pid_t pid; | |
932936f0 | 752 | ttevent_t tte; |
181e7f93 | 753 | struct inferior *inf; |
eee22bf8 | 754 | |
74164c56 | 755 | pid = parse_pid_to_attach (args); |
eee22bf8 MK |
756 | |
757 | if (pid == getpid ()) /* Trying to masturbate? */ | |
8a3fe4f8 | 758 | error (_("I refuse to debug myself!")); |
eee22bf8 MK |
759 | |
760 | if (from_tty) | |
761 | { | |
346e281c | 762 | exec_file = get_exec_file (0); |
eee22bf8 MK |
763 | |
764 | if (exec_file) | |
a3f17187 | 765 | printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
eee22bf8 MK |
766 | target_pid_to_str (pid_to_ptid (pid))); |
767 | else | |
a3f17187 | 768 | printf_unfiltered (_("Attaching to %s\n"), |
eee22bf8 MK |
769 | target_pid_to_str (pid_to_ptid (pid))); |
770 | ||
771 | gdb_flush (gdb_stdout); | |
772 | } | |
773 | ||
a7be7fa8 MK |
774 | gdb_assert (inf_ttrace_num_lwps == 0); |
775 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); | |
b2a4db28 | 776 | gdb_assert (inf_ttrace_vfork_ppid == -1); |
a7be7fa8 | 777 | |
eee22bf8 | 778 | if (ttrace (TT_PROC_ATTACH, pid, 0, TT_KILL_ON_EXIT, TT_VERSION, 0) == -1) |
e2e0b3e5 | 779 | perror_with_name (("ttrace")); |
eee22bf8 | 780 | |
6c95b8df PA |
781 | inf = current_inferior (); |
782 | inferior_appeared (inf, pid); | |
181e7f93 | 783 | inf->attach_flag = 1; |
7f9f62ba | 784 | |
932936f0 | 785 | /* Set the initial event mask. */ |
932936f0 | 786 | memset (&tte, 0, sizeof (tte)); |
b2a4db28 | 787 | tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT | TTEVT_FORK | TTEVT_VFORK; |
a7be7fa8 | 788 | tte.tte_events |= TTEVT_LWP_CREATE | TTEVT_LWP_EXIT | TTEVT_LWP_TERMINATE; |
7ba0e0c2 MK |
789 | #ifdef TTEVT_BPT_SSTEP |
790 | tte.tte_events |= TTEVT_BPT_SSTEP; | |
791 | #endif | |
b2a4db28 | 792 | tte.tte_opts |= TTEO_PROC_INHERIT; |
932936f0 MK |
793 | if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, |
794 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 795 | perror_with_name (("ttrace")); |
932936f0 | 796 | |
28439f5e | 797 | push_target (ops); |
2935f27f | 798 | |
f688d93f | 799 | inf_ttrace_create_threads_after_attach (pid); |
eee22bf8 MK |
800 | } |
801 | ||
802 | static void | |
136d6dae | 803 | inf_ttrace_detach (struct target_ops *ops, char *args, int from_tty) |
eee22bf8 | 804 | { |
eee22bf8 | 805 | pid_t pid = ptid_get_pid (inferior_ptid); |
5d426ff1 | 806 | int sig = 0; |
eee22bf8 MK |
807 | |
808 | if (from_tty) | |
809 | { | |
810 | char *exec_file = get_exec_file (0); | |
811 | if (exec_file == 0) | |
812 | exec_file = ""; | |
a3f17187 | 813 | printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file, |
eee22bf8 MK |
814 | target_pid_to_str (pid_to_ptid (pid))); |
815 | gdb_flush (gdb_stdout); | |
816 | } | |
817 | if (args) | |
818 | sig = atoi (args); | |
819 | ||
820 | /* ??? The HP-UX 11.0 ttrace(2) manual page doesn't mention that we | |
821 | can pass a signal number here. Does this really work? */ | |
822 | if (ttrace (TT_PROC_DETACH, pid, 0, 0, sig, 0) == -1) | |
e2e0b3e5 | 823 | perror_with_name (("ttrace")); |
eee22bf8 | 824 | |
b2a4db28 MK |
825 | if (inf_ttrace_vfork_ppid != -1) |
826 | { | |
827 | if (ttrace (TT_PROC_DETACH, inf_ttrace_vfork_ppid, 0, 0, 0, 0) == -1) | |
828 | perror_with_name (("ttrace")); | |
829 | inf_ttrace_vfork_ppid = -1; | |
830 | } | |
831 | ||
a7be7fa8 MK |
832 | inf_ttrace_num_lwps = 0; |
833 | inf_ttrace_num_lwps_in_syscall = 0; | |
932936f0 | 834 | |
932936f0 | 835 | inferior_ptid = null_ptid; |
7f9f62ba PA |
836 | detach_inferior (pid); |
837 | ||
28439f5e | 838 | unpush_target (ops); |
eee22bf8 MK |
839 | } |
840 | ||
346e281c | 841 | static void |
7d85a9c0 | 842 | inf_ttrace_kill (struct target_ops *ops) |
346e281c MK |
843 | { |
844 | pid_t pid = ptid_get_pid (inferior_ptid); | |
845 | ||
846 | if (pid == 0) | |
847 | return; | |
848 | ||
849 | if (ttrace (TT_PROC_EXIT, pid, 0, 0, 0, 0) == -1) | |
850 | perror_with_name (("ttrace")); | |
851 | /* ??? Is it necessary to call ttrace_wait() here? */ | |
852 | ||
853 | if (inf_ttrace_vfork_ppid != -1) | |
854 | { | |
855 | if (ttrace (TT_PROC_DETACH, inf_ttrace_vfork_ppid, 0, 0, 0, 0) == -1) | |
856 | perror_with_name (("ttrace")); | |
857 | inf_ttrace_vfork_ppid = -1; | |
858 | } | |
859 | ||
860 | target_mourn_inferior (); | |
861 | } | |
862 | ||
438ac09b PA |
863 | /* Check is a dying thread is dead by now, and delete it from GDBs |
864 | thread list if so. */ | |
7ba0e0c2 | 865 | static int |
438ac09b | 866 | inf_ttrace_delete_dead_threads_callback (struct thread_info *info, void *arg) |
7ba0e0c2 | 867 | { |
438ac09b PA |
868 | lwpid_t lwpid; |
869 | struct inf_ttrace_private_thread_info *p; | |
7ba0e0c2 | 870 | |
438ac09b PA |
871 | if (is_exited (info->ptid)) |
872 | return 0; | |
873 | ||
874 | lwpid = ptid_get_lwp (info->ptid); | |
875 | p = (struct inf_ttrace_private_thread_info *) info->private; | |
876 | ||
877 | /* Check if an lwp that was dying is still there or not. */ | |
878 | if (p->dying && (kill (lwpid, 0) == -1)) | |
879 | /* It's gone now. */ | |
880 | delete_thread (info->ptid); | |
7ba0e0c2 MK |
881 | |
882 | return 0; | |
883 | } | |
884 | ||
438ac09b PA |
885 | /* Resume the lwp pointed to by INFO, with REQUEST, and pass it signal |
886 | SIG. */ | |
887 | ||
888 | static void | |
889 | inf_ttrace_resume_lwp (struct thread_info *info, ttreq_t request, int sig) | |
890 | { | |
891 | pid_t pid = ptid_get_pid (info->ptid); | |
892 | lwpid_t lwpid = ptid_get_lwp (info->ptid); | |
893 | ||
894 | if (ttrace (request, pid, lwpid, TT_NOPC, sig, 0) == -1) | |
895 | { | |
896 | struct inf_ttrace_private_thread_info *p | |
897 | = (struct inf_ttrace_private_thread_info *) info->private; | |
898 | if (p->dying && errno == EPROTO) | |
899 | /* This is expected, it means the dying lwp is really gone | |
900 | by now. If ttrace had an event to inform the debugger | |
901 | the lwp is really gone, this wouldn't be needed. */ | |
902 | delete_thread (info->ptid); | |
903 | else | |
904 | /* This was really unexpected. */ | |
905 | perror_with_name (("ttrace")); | |
906 | } | |
907 | } | |
908 | ||
909 | /* Callback for iterate_over_threads. */ | |
910 | ||
60e2c248 | 911 | static int |
438ac09b | 912 | inf_ttrace_resume_callback (struct thread_info *info, void *arg) |
60e2c248 | 913 | { |
438ac09b PA |
914 | if (!ptid_equal (info->ptid, inferior_ptid) && !is_exited (info->ptid)) |
915 | inf_ttrace_resume_lwp (info, TT_LWP_CONTINUE, 0); | |
916 | ||
60e2c248 JG |
917 | return 0; |
918 | } | |
919 | ||
eee22bf8 | 920 | static void |
28439f5e | 921 | inf_ttrace_resume (struct target_ops *ops, |
2ea28649 | 922 | ptid_t ptid, int step, enum gdb_signal signal) |
eee22bf8 | 923 | { |
438ac09b | 924 | int resume_all; |
eee22bf8 | 925 | ttreq_t request = step ? TT_LWP_SINGLE : TT_LWP_CONTINUE; |
2ea28649 | 926 | int sig = gdb_signal_to_host (signal); |
438ac09b | 927 | struct thread_info *info; |
eee22bf8 | 928 | |
438ac09b PA |
929 | /* A specific PTID means `step only this process id'. */ |
930 | resume_all = (ptid_equal (ptid, minus_one_ptid)); | |
eee22bf8 | 931 | |
438ac09b PA |
932 | /* If resuming all threads, it's the current thread that should be |
933 | handled specially. */ | |
934 | if (resume_all) | |
935 | ptid = inferior_ptid; | |
eee22bf8 | 936 | |
e09875d4 | 937 | info = find_thread_ptid (ptid); |
438ac09b PA |
938 | inf_ttrace_resume_lwp (info, request, sig); |
939 | ||
940 | if (resume_all) | |
941 | /* Let all the other threads run too. */ | |
942 | iterate_over_threads (inf_ttrace_resume_callback, NULL); | |
eee22bf8 MK |
943 | } |
944 | ||
945 | static ptid_t | |
117de6a9 | 946 | inf_ttrace_wait (struct target_ops *ops, |
47608cb1 | 947 | ptid_t ptid, struct target_waitstatus *ourstatus, int options) |
eee22bf8 MK |
948 | { |
949 | pid_t pid = ptid_get_pid (ptid); | |
950 | lwpid_t lwpid = ptid_get_lwp (ptid); | |
951 | ttstate_t tts; | |
60e2c248 | 952 | struct thread_info *ti; |
3a3e9ee3 | 953 | ptid_t related_ptid; |
eee22bf8 | 954 | |
932936f0 | 955 | /* Until proven otherwise. */ |
a7be7fa8 | 956 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; |
eee22bf8 MK |
957 | |
958 | if (pid == -1) | |
b2a4db28 | 959 | pid = lwpid = 0; |
eee22bf8 | 960 | |
b2a4db28 | 961 | gdb_assert (pid != 0 || lwpid == 0); |
eee22bf8 MK |
962 | |
963 | do | |
964 | { | |
965 | set_sigint_trap (); | |
eee22bf8 MK |
966 | |
967 | if (ttrace_wait (pid, lwpid, TTRACE_WAITOK, &tts, sizeof tts) == -1) | |
a3f17187 | 968 | perror_with_name (("ttrace_wait")); |
eee22bf8 | 969 | |
b2a4db28 MK |
970 | if (tts.tts_event == TTEVT_VFORK && tts.tts_u.tts_fork.tts_isparent) |
971 | { | |
972 | if (inf_ttrace_vfork_ppid != -1) | |
973 | { | |
974 | gdb_assert (inf_ttrace_vfork_ppid == tts.tts_pid); | |
975 | ||
976 | if (ttrace (TT_PROC_DETACH, tts.tts_pid, 0, 0, 0, 0) == -1) | |
977 | perror_with_name (("ttrace")); | |
978 | inf_ttrace_vfork_ppid = -1; | |
979 | } | |
980 | ||
981 | tts.tts_event = TTEVT_NONE; | |
982 | } | |
983 | ||
eee22bf8 MK |
984 | clear_sigint_trap (); |
985 | } | |
986 | while (tts.tts_event == TTEVT_NONE); | |
987 | ||
932936f0 MK |
988 | /* Now that we've waited, we can re-enable the page protections. */ |
989 | if (inf_ttrace_reenable_page_protections) | |
990 | { | |
a7be7fa8 | 991 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); |
932936f0 MK |
992 | inf_ttrace_enable_page_protections (tts.tts_pid); |
993 | inf_ttrace_reenable_page_protections = 0; | |
994 | } | |
995 | ||
a7be7fa8 MK |
996 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); |
997 | ||
2935f27f PA |
998 | if (inf_ttrace_num_lwps == 0) |
999 | { | |
1000 | struct thread_info *ti; | |
1001 | ||
1002 | inf_ttrace_num_lwps = 1; | |
1003 | ||
1004 | /* This is the earliest we hear about the lwp member of | |
1005 | INFERIOR_PTID, after an attach or fork_inferior. */ | |
1006 | gdb_assert (ptid_get_lwp (inferior_ptid) == 0); | |
1007 | ||
1008 | /* We haven't set the private member on the main thread yet. Do | |
1009 | it now. */ | |
e09875d4 | 1010 | ti = find_thread_ptid (inferior_ptid); |
2935f27f PA |
1011 | gdb_assert (ti != NULL && ti->private == NULL); |
1012 | ti->private = | |
1013 | xmalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
1014 | memset (ti->private, 0, | |
1015 | sizeof (struct inf_ttrace_private_thread_info)); | |
1016 | ||
1017 | /* Notify the core that this ptid changed. This changes | |
1018 | inferior_ptid as well. */ | |
1019 | thread_change_ptid (inferior_ptid, ptid); | |
1020 | } | |
1021 | ||
eee22bf8 MK |
1022 | switch (tts.tts_event) |
1023 | { | |
7ba0e0c2 MK |
1024 | #ifdef TTEVT_BPT_SSTEP |
1025 | case TTEVT_BPT_SSTEP: | |
1026 | /* Make it look like a breakpoint. */ | |
1027 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 1028 | ourstatus->value.sig = GDB_SIGNAL_TRAP; |
7ba0e0c2 MK |
1029 | break; |
1030 | #endif | |
1031 | ||
eee22bf8 | 1032 | case TTEVT_EXEC: |
5d426ff1 MK |
1033 | ourstatus->kind = TARGET_WAITKIND_EXECD; |
1034 | ourstatus->value.execd_pathname = | |
1035 | xmalloc (tts.tts_u.tts_exec.tts_pathlen + 1); | |
1036 | if (ttrace (TT_PROC_GET_PATHNAME, tts.tts_pid, 0, | |
1037 | (uintptr_t)ourstatus->value.execd_pathname, | |
1038 | tts.tts_u.tts_exec.tts_pathlen, 0) == -1) | |
1039 | perror_with_name (("ttrace")); | |
1040 | ourstatus->value.execd_pathname[tts.tts_u.tts_exec.tts_pathlen] = 0; | |
25b22b0a PA |
1041 | |
1042 | /* At this point, all inserted breakpoints are gone. Doing this | |
1043 | as soon as we detect an exec prevents the badness of deleting | |
1044 | a breakpoint writing the current "shadow contents" to lift | |
1045 | the bp. That shadow is NOT valid after an exec. */ | |
1046 | mark_breakpoints_out (); | |
eee22bf8 | 1047 | break; |
932936f0 | 1048 | |
eee22bf8 MK |
1049 | case TTEVT_EXIT: |
1050 | store_waitstatus (ourstatus, tts.tts_u.tts_exit.tts_exitcode); | |
a7be7fa8 MK |
1051 | inf_ttrace_num_lwps = 0; |
1052 | break; | |
1053 | ||
b2a4db28 | 1054 | case TTEVT_FORK: |
3a3e9ee3 PA |
1055 | related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid, |
1056 | tts.tts_u.tts_fork.tts_flwpid, 0); | |
1057 | ||
b2a4db28 | 1058 | ourstatus->kind = TARGET_WAITKIND_FORKED; |
3a3e9ee3 | 1059 | ourstatus->value.related_pid = related_ptid; |
b2a4db28 MK |
1060 | |
1061 | /* Make sure the other end of the fork is stopped too. */ | |
1062 | if (ttrace_wait (tts.tts_u.tts_fork.tts_fpid, | |
1063 | tts.tts_u.tts_fork.tts_flwpid, | |
1064 | TTRACE_WAITOK, &tts, sizeof tts) == -1) | |
1065 | perror_with_name (("ttrace_wait")); | |
1066 | ||
1067 | gdb_assert (tts.tts_event == TTEVT_FORK); | |
1068 | if (tts.tts_u.tts_fork.tts_isparent) | |
1069 | { | |
3a3e9ee3 PA |
1070 | related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid, |
1071 | tts.tts_u.tts_fork.tts_flwpid, 0); | |
b2a4db28 | 1072 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); |
3a3e9ee3 | 1073 | ourstatus->value.related_pid = related_ptid; |
b2a4db28 MK |
1074 | } |
1075 | break; | |
1076 | ||
1077 | case TTEVT_VFORK: | |
1078 | gdb_assert (!tts.tts_u.tts_fork.tts_isparent); | |
1079 | ||
3a3e9ee3 PA |
1080 | related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid, |
1081 | tts.tts_u.tts_fork.tts_flwpid, 0); | |
1082 | ||
b2a4db28 | 1083 | ourstatus->kind = TARGET_WAITKIND_VFORKED; |
3a3e9ee3 | 1084 | ourstatus->value.related_pid = related_ptid; |
b2a4db28 MK |
1085 | |
1086 | /* HACK: To avoid touching the parent during the vfork, switch | |
1087 | away from it. */ | |
1088 | inferior_ptid = ptid; | |
1089 | break; | |
1090 | ||
a7be7fa8 MK |
1091 | case TTEVT_LWP_CREATE: |
1092 | lwpid = tts.tts_u.tts_thread.tts_target_lwpid; | |
1093 | ptid = ptid_build (tts.tts_pid, lwpid, 0); | |
60e2c248 JG |
1094 | ti = add_thread (ptid); |
1095 | ti->private = | |
1096 | xmalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
1097 | memset (ti->private, 0, | |
1098 | sizeof (struct inf_ttrace_private_thread_info)); | |
a7be7fa8 MK |
1099 | inf_ttrace_num_lwps++; |
1100 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); | |
62a93fa9 PA |
1101 | /* Let the lwp_create-caller thread continue. */ |
1102 | ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid), | |
1103 | ptid_get_lwp (ptid), TT_NOPC, 0, 0); | |
1104 | /* Return without stopping the whole process. */ | |
1105 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
1106 | return ptid; | |
a7be7fa8 MK |
1107 | |
1108 | case TTEVT_LWP_EXIT: | |
17faa917 DJ |
1109 | if (print_thread_events) |
1110 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (ptid)); | |
e09875d4 | 1111 | ti = find_thread_ptid (ptid); |
60e2c248 JG |
1112 | gdb_assert (ti != NULL); |
1113 | ((struct inf_ttrace_private_thread_info *)ti->private)->dying = 1; | |
a7be7fa8 | 1114 | inf_ttrace_num_lwps--; |
62a93fa9 | 1115 | /* Let the thread really exit. */ |
60e2c248 JG |
1116 | ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid), |
1117 | ptid_get_lwp (ptid), TT_NOPC, 0, 0); | |
62a93fa9 PA |
1118 | /* Return without stopping the whole process. */ |
1119 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
1120 | return ptid; | |
a7be7fa8 MK |
1121 | |
1122 | case TTEVT_LWP_TERMINATE: | |
1123 | lwpid = tts.tts_u.tts_thread.tts_target_lwpid; | |
1124 | ptid = ptid_build (tts.tts_pid, lwpid, 0); | |
62a93fa9 | 1125 | if (print_thread_events) |
b861ac81 | 1126 | printf_unfiltered(_("[%s has been terminated]\n"), |
62a93fa9 | 1127 | target_pid_to_str (ptid)); |
e09875d4 | 1128 | ti = find_thread_ptid (ptid); |
60e2c248 JG |
1129 | gdb_assert (ti != NULL); |
1130 | ((struct inf_ttrace_private_thread_info *)ti->private)->dying = 1; | |
a7be7fa8 | 1131 | inf_ttrace_num_lwps--; |
62a93fa9 PA |
1132 | |
1133 | /* Resume the lwp_terminate-caller thread. */ | |
a7be7fa8 | 1134 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); |
62a93fa9 PA |
1135 | ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid), |
1136 | ptid_get_lwp (ptid), TT_NOPC, 0, 0); | |
1137 | /* Return without stopping the whole process. */ | |
1138 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
1139 | return ptid; | |
932936f0 | 1140 | |
eee22bf8 MK |
1141 | case TTEVT_SIGNAL: |
1142 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
1143 | ourstatus->value.sig = | |
2ea28649 | 1144 | gdb_signal_from_host (tts.tts_u.tts_signal.tts_signo); |
eee22bf8 | 1145 | break; |
932936f0 MK |
1146 | |
1147 | case TTEVT_SYSCALL_ENTRY: | |
1148 | gdb_assert (inf_ttrace_reenable_page_protections == 0); | |
a7be7fa8 MK |
1149 | inf_ttrace_num_lwps_in_syscall++; |
1150 | if (inf_ttrace_num_lwps_in_syscall == 1) | |
932936f0 MK |
1151 | { |
1152 | /* A thread has just entered a system call. Disable any | |
1153 | page protections as the kernel can't deal with them. */ | |
1154 | inf_ttrace_disable_page_protections (tts.tts_pid); | |
1155 | } | |
1156 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_ENTRY; | |
01dedca2 | 1157 | ourstatus->value.syscall_number = tts.tts_scno; |
932936f0 MK |
1158 | break; |
1159 | ||
1160 | case TTEVT_SYSCALL_RETURN: | |
a7be7fa8 | 1161 | if (inf_ttrace_num_lwps_in_syscall > 0) |
932936f0 MK |
1162 | { |
1163 | /* If the last thread has just left the system call, this | |
1164 | would be a logical place to re-enable the page | |
1165 | protections, but that doesn't work. We can't re-enable | |
1166 | them until we've done another wait. */ | |
1167 | inf_ttrace_reenable_page_protections = | |
a7be7fa8 MK |
1168 | (inf_ttrace_num_lwps_in_syscall == 1); |
1169 | inf_ttrace_num_lwps_in_syscall--; | |
932936f0 MK |
1170 | } |
1171 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_RETURN; | |
01dedca2 | 1172 | ourstatus->value.syscall_number = tts.tts_scno; |
932936f0 | 1173 | break; |
a7be7fa8 MK |
1174 | |
1175 | default: | |
1176 | gdb_assert (!"Unexpected ttrace event"); | |
1177 | break; | |
eee22bf8 MK |
1178 | } |
1179 | ||
1180 | /* Make sure all threads within the process are stopped. */ | |
1181 | if (ttrace (TT_PROC_STOP, tts.tts_pid, 0, 0, 0, 0) == -1) | |
e2e0b3e5 | 1182 | perror_with_name (("ttrace")); |
eee22bf8 | 1183 | |
438ac09b PA |
1184 | /* Now that the whole process is stopped, check if any dying thread |
1185 | is really dead by now. If a dying thread is still alive, it will | |
1186 | be stopped too, and will still show up in `info threads', tagged | |
1187 | with "(Exiting)". We could make `info threads' prune dead | |
1188 | threads instead via inf_ttrace_thread_alive, but doing this here | |
1189 | has the advantage that a frontend is notificed sooner of thread | |
1190 | exits. Note that a dying lwp is still alive, it still has to be | |
1191 | resumed, like any other lwp. */ | |
1192 | iterate_over_threads (inf_ttrace_delete_dead_threads_callback, NULL); | |
1193 | ||
a7be7fa8 | 1194 | return ptid; |
eee22bf8 MK |
1195 | } |
1196 | ||
1197 | /* Transfer LEN bytes from ADDR in the inferior's memory into READBUF, | |
1198 | and transfer LEN bytes from WRITEBUF into the inferior's memory at | |
1199 | ADDR. Either READBUF or WRITEBUF may be null, in which case the | |
1200 | corresponding transfer doesn't happen. Return the number of bytes | |
1201 | actually transferred (which may be zero if an error occurs). */ | |
1202 | ||
1203 | static LONGEST | |
1204 | inf_ttrace_xfer_memory (CORE_ADDR addr, ULONGEST len, | |
1205 | void *readbuf, const void *writebuf) | |
1206 | { | |
1207 | pid_t pid = ptid_get_pid (inferior_ptid); | |
1208 | ||
1209 | /* HP-UX treats text space and data space differently. GDB however, | |
1210 | doesn't really know the difference. Therefore we try both. Try | |
1211 | text space before data space though because when we're writing | |
1212 | into text space the instruction cache might need to be flushed. */ | |
1213 | ||
1214 | if (readbuf | |
1215 | && ttrace (TT_PROC_RDTEXT, pid, 0, addr, len, (uintptr_t)readbuf) == -1 | |
1216 | && ttrace (TT_PROC_RDDATA, pid, 0, addr, len, (uintptr_t)readbuf) == -1) | |
1217 | return 0; | |
1218 | ||
1219 | if (writebuf | |
1220 | && ttrace (TT_PROC_WRTEXT, pid, 0, addr, len, (uintptr_t)writebuf) == -1 | |
1221 | && ttrace (TT_PROC_WRDATA, pid, 0, addr, len, (uintptr_t)writebuf) == -1) | |
1222 | return 0; | |
1223 | ||
1224 | return len; | |
1225 | } | |
1226 | ||
1227 | static LONGEST | |
1228 | inf_ttrace_xfer_partial (struct target_ops *ops, enum target_object object, | |
7a4609f7 | 1229 | const char *annex, gdb_byte *readbuf, |
3e43a32a MS |
1230 | const gdb_byte *writebuf, |
1231 | ULONGEST offset, LONGEST len) | |
eee22bf8 MK |
1232 | { |
1233 | switch (object) | |
1234 | { | |
1235 | case TARGET_OBJECT_MEMORY: | |
1236 | return inf_ttrace_xfer_memory (offset, len, readbuf, writebuf); | |
1237 | ||
1238 | case TARGET_OBJECT_UNWIND_TABLE: | |
1239 | return -1; | |
1240 | ||
1241 | case TARGET_OBJECT_AUXV: | |
1242 | return -1; | |
1243 | ||
1244 | case TARGET_OBJECT_WCOOKIE: | |
1245 | return -1; | |
1246 | ||
1247 | default: | |
1248 | return -1; | |
1249 | } | |
1250 | } | |
1251 | ||
1252 | /* Print status information about what we're accessing. */ | |
1253 | ||
1254 | static void | |
1255 | inf_ttrace_files_info (struct target_ops *ignore) | |
1256 | { | |
181e7f93 | 1257 | struct inferior *inf = current_inferior (); |
346e281c | 1258 | printf_filtered (_("\tUsing the running image of %s %s.\n"), |
181e7f93 | 1259 | inf->attach_flag ? "attached" : "child", |
346e281c | 1260 | target_pid_to_str (inferior_ptid)); |
eee22bf8 | 1261 | } |
a7be7fa8 MK |
1262 | |
1263 | static int | |
28439f5e | 1264 | inf_ttrace_thread_alive (struct target_ops *ops, ptid_t ptid) |
a7be7fa8 | 1265 | { |
438ac09b PA |
1266 | return 1; |
1267 | } | |
1268 | ||
1269 | /* Return a string describing the state of the thread specified by | |
1270 | INFO. */ | |
1271 | ||
1272 | static char * | |
1273 | inf_ttrace_extra_thread_info (struct thread_info *info) | |
1274 | { | |
1275 | struct inf_ttrace_private_thread_info* private = | |
1276 | (struct inf_ttrace_private_thread_info *) info->private; | |
1277 | ||
1278 | if (private != NULL && private->dying) | |
1279 | return "Exiting"; | |
1280 | ||
1281 | return NULL; | |
a7be7fa8 MK |
1282 | } |
1283 | ||
1284 | static char * | |
117de6a9 | 1285 | inf_ttrace_pid_to_str (struct target_ops *ops, ptid_t ptid) |
a7be7fa8 | 1286 | { |
2935f27f PA |
1287 | pid_t pid = ptid_get_pid (ptid); |
1288 | lwpid_t lwpid = ptid_get_lwp (ptid); | |
1289 | static char buf[128]; | |
a7be7fa8 | 1290 | |
2935f27f PA |
1291 | if (lwpid == 0) |
1292 | xsnprintf (buf, sizeof buf, "process %ld", | |
1293 | (long) pid); | |
1294 | else | |
1295 | xsnprintf (buf, sizeof buf, "process %ld, lwp %ld", | |
1296 | (long) pid, (long) lwpid); | |
1297 | return buf; | |
a7be7fa8 | 1298 | } |
eee22bf8 MK |
1299 | \f |
1300 | ||
fa07e785 JB |
1301 | /* Implement the get_ada_task_ptid target_ops method. */ |
1302 | ||
1303 | static ptid_t | |
1304 | inf_ttrace_get_ada_task_ptid (long lwp, long thread) | |
1305 | { | |
1306 | return ptid_build (ptid_get_pid (inferior_ptid), lwp, 0); | |
1307 | } | |
1308 | ||
1309 | \f | |
eee22bf8 MK |
1310 | struct target_ops * |
1311 | inf_ttrace_target (void) | |
1312 | { | |
1313 | struct target_ops *t = inf_child_target (); | |
1314 | ||
eee22bf8 MK |
1315 | t->to_attach = inf_ttrace_attach; |
1316 | t->to_detach = inf_ttrace_detach; | |
1317 | t->to_resume = inf_ttrace_resume; | |
1318 | t->to_wait = inf_ttrace_wait; | |
eee22bf8 | 1319 | t->to_files_info = inf_ttrace_files_info; |
932936f0 | 1320 | t->to_can_use_hw_breakpoint = inf_ttrace_can_use_hw_breakpoint; |
932936f0 MK |
1321 | t->to_insert_watchpoint = inf_ttrace_insert_watchpoint; |
1322 | t->to_remove_watchpoint = inf_ttrace_remove_watchpoint; | |
1323 | t->to_stopped_by_watchpoint = inf_ttrace_stopped_by_watchpoint; | |
2a3cdf79 WZ |
1324 | t->to_region_ok_for_hw_watchpoint = |
1325 | inf_ttrace_region_ok_for_hw_watchpoint; | |
346e281c MK |
1326 | t->to_kill = inf_ttrace_kill; |
1327 | t->to_create_inferior = inf_ttrace_create_inferior; | |
1328 | t->to_follow_fork = inf_ttrace_follow_fork; | |
1329 | t->to_mourn_inferior = inf_ttrace_mourn_inferior; | |
1330 | t->to_thread_alive = inf_ttrace_thread_alive; | |
438ac09b | 1331 | t->to_extra_thread_info = inf_ttrace_extra_thread_info; |
346e281c MK |
1332 | t->to_pid_to_str = inf_ttrace_pid_to_str; |
1333 | t->to_xfer_partial = inf_ttrace_xfer_partial; | |
fa07e785 | 1334 | t->to_get_ada_task_ptid = inf_ttrace_get_ada_task_ptid; |
eee22bf8 | 1335 | |
eee22bf8 MK |
1336 | return t; |
1337 | } | |
d3322e8a | 1338 | #endif |
932936f0 MK |
1339 | \f |
1340 | ||
1341 | /* Prevent warning from -Wmissing-prototypes. */ | |
0b155465 | 1342 | void _initialize_inf_ttrace (void); |
eee22bf8 | 1343 | |
932936f0 MK |
1344 | void |
1345 | _initialize_inf_ttrace (void) | |
1346 | { | |
d3322e8a | 1347 | #ifdef HAVE_TTRACE |
932936f0 | 1348 | inf_ttrace_page_dict.pagesize = getpagesize(); |
eee22bf8 | 1349 | #endif |
d3322e8a | 1350 | } |