Commit | Line | Data |
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eee22bf8 MK |
1 | /* Low-level child interface to ttrace. |
2 | ||
ecd75fc8 | 3 | Copyright (C) 2004-2014 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 | |
b2a4db28 MK |
406 | /* When tracking a vfork(2), we cannot detach from the parent until |
407 | after the child has called exec(3) or has exited. If we are still | |
408 | attached to the parent, this variable will be set to the process ID | |
409 | of the parent. Otherwise it will be set to zero. */ | |
410 | static pid_t inf_ttrace_vfork_ppid = -1; | |
411 | ||
412 | static int | |
07107ca6 LM |
413 | inf_ttrace_follow_fork (struct target_ops *ops, int follow_child, |
414 | int detach_fork) | |
b2a4db28 MK |
415 | { |
416 | pid_t pid, fpid; | |
417 | lwpid_t lwpid, flwpid; | |
418 | ttstate_t tts; | |
e58b0e63 PA |
419 | struct thread_info *tp = inferior_thread (); |
420 | ||
421 | gdb_assert (tp->pending_follow.kind == TARGET_WAITKIND_FORKED | |
422 | || tp->pending_follow.kind == TARGET_WAITKIND_VFORKED); | |
423 | ||
424 | pid = ptid_get_pid (inferior_ptid); | |
425 | lwpid = ptid_get_lwp (inferior_ptid); | |
b2a4db28 MK |
426 | |
427 | /* Get all important details that core GDB doesn't (and shouldn't) | |
428 | know about. */ | |
429 | if (ttrace (TT_LWP_GET_STATE, pid, lwpid, | |
430 | (uintptr_t)&tts, sizeof tts, 0) == -1) | |
431 | perror_with_name (("ttrace")); | |
432 | ||
433 | gdb_assert (tts.tts_event == TTEVT_FORK || tts.tts_event == TTEVT_VFORK); | |
434 | ||
435 | if (tts.tts_u.tts_fork.tts_isparent) | |
436 | { | |
437 | pid = tts.tts_pid; | |
438 | lwpid = tts.tts_lwpid; | |
439 | fpid = tts.tts_u.tts_fork.tts_fpid; | |
440 | flwpid = tts.tts_u.tts_fork.tts_flwpid; | |
441 | } | |
442 | else | |
443 | { | |
444 | pid = tts.tts_u.tts_fork.tts_fpid; | |
445 | lwpid = tts.tts_u.tts_fork.tts_flwpid; | |
446 | fpid = tts.tts_pid; | |
447 | flwpid = tts.tts_lwpid; | |
448 | } | |
449 | ||
450 | if (follow_child) | |
451 | { | |
77435e4c | 452 | struct inferior *inf; |
191c4426 PA |
453 | struct inferior *parent_inf; |
454 | ||
455 | parent_inf = find_inferior_pid (pid); | |
77435e4c | 456 | |
b2a4db28 | 457 | inferior_ptid = ptid_build (fpid, flwpid, 0); |
77435e4c | 458 | inf = add_inferior (fpid); |
191c4426 | 459 | inf->attach_flag = parent_inf->attach_flag; |
6c95b8df PA |
460 | inf->pspace = parent_inf->pspace; |
461 | inf->aspace = parent_inf->aspace; | |
191c4426 | 462 | copy_terminal_info (inf, parent_inf); |
d80ee84f | 463 | detach_breakpoints (ptid_build (pid, lwpid, 0)); |
b2a4db28 MK |
464 | |
465 | target_terminal_ours (); | |
3e43a32a MS |
466 | fprintf_unfiltered (gdb_stdlog, |
467 | _("Attaching after fork to child process %ld.\n"), | |
468 | (long)fpid); | |
b2a4db28 MK |
469 | } |
470 | else | |
471 | { | |
472 | inferior_ptid = ptid_build (pid, lwpid, 0); | |
2dcc6086 JB |
473 | /* Detach any remaining breakpoints in the child. In the case |
474 | of fork events, we do not need to do this, because breakpoints | |
475 | should have already been removed earlier. */ | |
476 | if (tts.tts_event == TTEVT_VFORK) | |
d80ee84f | 477 | detach_breakpoints (ptid_build (fpid, flwpid, 0)); |
b2a4db28 MK |
478 | |
479 | target_terminal_ours (); | |
3e43a32a MS |
480 | fprintf_unfiltered (gdb_stdlog, |
481 | _("Detaching after fork from child process %ld.\n"), | |
482 | (long)fpid); | |
b2a4db28 MK |
483 | } |
484 | ||
485 | if (tts.tts_event == TTEVT_VFORK) | |
486 | { | |
487 | gdb_assert (!tts.tts_u.tts_fork.tts_isparent); | |
488 | ||
489 | if (follow_child) | |
490 | { | |
491 | /* We can't detach from the parent yet. */ | |
492 | inf_ttrace_vfork_ppid = pid; | |
493 | ||
494 | reattach_breakpoints (fpid); | |
495 | } | |
496 | else | |
497 | { | |
498 | if (ttrace (TT_PROC_DETACH, fpid, 0, 0, 0, 0) == -1) | |
499 | perror_with_name (("ttrace")); | |
500 | ||
501 | /* Wait till we get the TTEVT_VFORK event in the parent. | |
502 | This indicates that the child has called exec(3) or has | |
503 | exited and that the parent is ready to be traced again. */ | |
504 | if (ttrace_wait (pid, lwpid, TTRACE_WAITOK, &tts, sizeof tts) == -1) | |
505 | perror_with_name (("ttrace_wait")); | |
506 | gdb_assert (tts.tts_event == TTEVT_VFORK); | |
507 | gdb_assert (tts.tts_u.tts_fork.tts_isparent); | |
508 | ||
509 | reattach_breakpoints (pid); | |
510 | } | |
511 | } | |
512 | else | |
513 | { | |
514 | gdb_assert (tts.tts_u.tts_fork.tts_isparent); | |
515 | ||
516 | if (follow_child) | |
517 | { | |
518 | if (ttrace (TT_PROC_DETACH, pid, 0, 0, 0, 0) == -1) | |
519 | perror_with_name (("ttrace")); | |
520 | } | |
521 | else | |
522 | { | |
523 | if (ttrace (TT_PROC_DETACH, fpid, 0, 0, 0, 0) == -1) | |
524 | perror_with_name (("ttrace")); | |
525 | } | |
526 | } | |
527 | ||
528 | if (follow_child) | |
529 | { | |
2935f27f PA |
530 | struct thread_info *ti; |
531 | ||
b2a4db28 | 532 | /* The child will start out single-threaded. */ |
2935f27f | 533 | inf_ttrace_num_lwps = 1; |
b2a4db28 MK |
534 | inf_ttrace_num_lwps_in_syscall = 0; |
535 | ||
2935f27f PA |
536 | /* Delete parent. */ |
537 | delete_thread_silent (ptid_build (pid, lwpid, 0)); | |
7f9f62ba | 538 | detach_inferior (pid); |
2935f27f | 539 | |
7f9f62ba | 540 | /* Add child thread. inferior_ptid was already set above. */ |
2935f27f PA |
541 | ti = add_thread_silent (inferior_ptid); |
542 | ti->private = | |
543 | xmalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
544 | memset (ti->private, 0, | |
545 | sizeof (struct inf_ttrace_private_thread_info)); | |
b2a4db28 MK |
546 | } |
547 | ||
548 | return 0; | |
549 | } | |
550 | \f | |
551 | ||
eee22bf8 MK |
552 | /* File descriptors for pipes used as semaphores during initial |
553 | startup of an inferior. */ | |
554 | static int inf_ttrace_pfd1[2]; | |
555 | static int inf_ttrace_pfd2[2]; | |
556 | ||
557 | static void | |
558 | do_cleanup_pfds (void *dummy) | |
559 | { | |
560 | close (inf_ttrace_pfd1[0]); | |
561 | close (inf_ttrace_pfd1[1]); | |
562 | close (inf_ttrace_pfd2[0]); | |
563 | close (inf_ttrace_pfd2[1]); | |
21ff4686 TT |
564 | |
565 | unmark_fd_no_cloexec (inf_ttrace_pfd1[0]); | |
566 | unmark_fd_no_cloexec (inf_ttrace_pfd1[1]); | |
567 | unmark_fd_no_cloexec (inf_ttrace_pfd2[0]); | |
568 | unmark_fd_no_cloexec (inf_ttrace_pfd2[1]); | |
eee22bf8 MK |
569 | } |
570 | ||
571 | static void | |
572 | inf_ttrace_prepare (void) | |
573 | { | |
574 | if (pipe (inf_ttrace_pfd1) == -1) | |
a3f17187 | 575 | perror_with_name (("pipe")); |
eee22bf8 MK |
576 | |
577 | if (pipe (inf_ttrace_pfd2) == -1) | |
578 | { | |
579 | close (inf_ttrace_pfd1[0]); | |
580 | close (inf_ttrace_pfd2[0]); | |
a3f17187 | 581 | perror_with_name (("pipe")); |
eee22bf8 | 582 | } |
21ff4686 TT |
583 | |
584 | mark_fd_no_cloexec (inf_ttrace_pfd1[0]); | |
585 | mark_fd_no_cloexec (inf_ttrace_pfd1[1]); | |
586 | mark_fd_no_cloexec (inf_ttrace_pfd2[0]); | |
587 | mark_fd_no_cloexec (inf_ttrace_pfd2[1]); | |
eee22bf8 MK |
588 | } |
589 | ||
590 | /* Prepare to be traced. */ | |
591 | ||
592 | static void | |
593 | inf_ttrace_me (void) | |
594 | { | |
595 | struct cleanup *old_chain = make_cleanup (do_cleanup_pfds, 0); | |
596 | char c; | |
597 | ||
598 | /* "Trace me, Dr. Memory!" */ | |
599 | if (ttrace (TT_PROC_SETTRC, 0, 0, 0, TT_VERSION, 0) == -1) | |
e2e0b3e5 | 600 | perror_with_name (("ttrace")); |
eee22bf8 MK |
601 | |
602 | /* Tell our parent that we are ready to be traced. */ | |
603 | if (write (inf_ttrace_pfd1[1], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 604 | perror_with_name (("write")); |
eee22bf8 MK |
605 | |
606 | /* Wait until our parent has set the initial event mask. */ | |
607 | if (read (inf_ttrace_pfd2[0], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 608 | perror_with_name (("read")); |
eee22bf8 MK |
609 | |
610 | do_cleanups (old_chain); | |
611 | } | |
612 | ||
613 | /* Start tracing PID. */ | |
614 | ||
615 | static void | |
28439f5e | 616 | inf_ttrace_him (struct target_ops *ops, int pid) |
eee22bf8 MK |
617 | { |
618 | struct cleanup *old_chain = make_cleanup (do_cleanup_pfds, 0); | |
619 | ttevent_t tte; | |
eee22bf8 MK |
620 | char c; |
621 | ||
622 | /* Wait until our child is ready to be traced. */ | |
623 | if (read (inf_ttrace_pfd1[0], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 624 | perror_with_name (("read")); |
eee22bf8 MK |
625 | |
626 | /* Set the initial event mask. */ | |
627 | memset (&tte, 0, sizeof (tte)); | |
b2a4db28 | 628 | tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT | TTEVT_FORK | TTEVT_VFORK; |
a7be7fa8 | 629 | tte.tte_events |= TTEVT_LWP_CREATE | TTEVT_LWP_EXIT | TTEVT_LWP_TERMINATE; |
7ba0e0c2 MK |
630 | #ifdef TTEVT_BPT_SSTEP |
631 | tte.tte_events |= TTEVT_BPT_SSTEP; | |
632 | #endif | |
b2a4db28 | 633 | tte.tte_opts |= TTEO_PROC_INHERIT; |
eee22bf8 MK |
634 | if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, |
635 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 636 | perror_with_name (("ttrace")); |
eee22bf8 MK |
637 | |
638 | /* Tell our child that we have set the initial event mask. */ | |
639 | if (write (inf_ttrace_pfd2[1], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 640 | perror_with_name (("write")); |
eee22bf8 MK |
641 | |
642 | do_cleanups (old_chain); | |
643 | ||
6a3cb8e8 PA |
644 | if (!target_is_pushed (ops)) |
645 | push_target (ops); | |
eee22bf8 | 646 | |
eee22bf8 MK |
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 | ||
c1ee2fb3 | 696 | inf_child_mourn_inferior (ops); |
eee22bf8 MK |
697 | } |
698 | ||
f688d93f JB |
699 | /* Assuming we just attached the debugger to a new inferior, create |
700 | a new thread_info structure for each thread, and add it to our | |
701 | list of threads. */ | |
702 | ||
703 | static void | |
704 | inf_ttrace_create_threads_after_attach (int pid) | |
705 | { | |
706 | int status; | |
707 | ptid_t ptid; | |
708 | ttstate_t tts; | |
709 | struct thread_info *ti; | |
710 | ||
711 | status = ttrace (TT_PROC_GET_FIRST_LWP_STATE, pid, 0, | |
712 | (uintptr_t) &tts, sizeof (ttstate_t), 0); | |
713 | if (status < 0) | |
714 | perror_with_name (_("TT_PROC_GET_FIRST_LWP_STATE ttrace call failed")); | |
715 | gdb_assert (tts.tts_pid == pid); | |
716 | ||
717 | /* Add the stopped thread. */ | |
718 | ptid = ptid_build (pid, tts.tts_lwpid, 0); | |
719 | ti = add_thread (ptid); | |
720 | ti->private = xzalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
721 | inf_ttrace_num_lwps++; | |
722 | ||
723 | /* We use the "first stopped thread" as the currently active thread. */ | |
724 | inferior_ptid = ptid; | |
725 | ||
726 | /* Iterative over all the remaining threads. */ | |
727 | ||
728 | for (;;) | |
729 | { | |
730 | ptid_t ptid; | |
731 | ||
732 | status = ttrace (TT_PROC_GET_NEXT_LWP_STATE, pid, 0, | |
733 | (uintptr_t) &tts, sizeof (ttstate_t), 0); | |
734 | if (status < 0) | |
735 | perror_with_name (_("TT_PROC_GET_NEXT_LWP_STATE ttrace call failed")); | |
736 | if (status == 0) | |
737 | break; /* End of list. */ | |
738 | ||
739 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); | |
740 | ti = add_thread (ptid); | |
741 | ti->private = xzalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
742 | inf_ttrace_num_lwps++; | |
743 | } | |
744 | } | |
745 | ||
eee22bf8 | 746 | static void |
c0939df1 | 747 | inf_ttrace_attach (struct target_ops *ops, const char *args, int from_tty) |
eee22bf8 MK |
748 | { |
749 | char *exec_file; | |
750 | pid_t pid; | |
932936f0 | 751 | ttevent_t tte; |
181e7f93 | 752 | struct inferior *inf; |
eee22bf8 | 753 | |
74164c56 | 754 | pid = parse_pid_to_attach (args); |
eee22bf8 MK |
755 | |
756 | if (pid == getpid ()) /* Trying to masturbate? */ | |
8a3fe4f8 | 757 | error (_("I refuse to debug myself!")); |
eee22bf8 MK |
758 | |
759 | if (from_tty) | |
760 | { | |
346e281c | 761 | exec_file = get_exec_file (0); |
eee22bf8 MK |
762 | |
763 | if (exec_file) | |
a3f17187 | 764 | printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
eee22bf8 MK |
765 | target_pid_to_str (pid_to_ptid (pid))); |
766 | else | |
a3f17187 | 767 | printf_unfiltered (_("Attaching to %s\n"), |
eee22bf8 MK |
768 | target_pid_to_str (pid_to_ptid (pid))); |
769 | ||
770 | gdb_flush (gdb_stdout); | |
771 | } | |
772 | ||
a7be7fa8 MK |
773 | gdb_assert (inf_ttrace_num_lwps == 0); |
774 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); | |
b2a4db28 | 775 | gdb_assert (inf_ttrace_vfork_ppid == -1); |
a7be7fa8 | 776 | |
eee22bf8 | 777 | if (ttrace (TT_PROC_ATTACH, pid, 0, TT_KILL_ON_EXIT, TT_VERSION, 0) == -1) |
e2e0b3e5 | 778 | perror_with_name (("ttrace")); |
eee22bf8 | 779 | |
6c95b8df PA |
780 | inf = current_inferior (); |
781 | inferior_appeared (inf, pid); | |
181e7f93 | 782 | inf->attach_flag = 1; |
7f9f62ba | 783 | |
932936f0 | 784 | /* Set the initial event mask. */ |
932936f0 | 785 | memset (&tte, 0, sizeof (tte)); |
b2a4db28 | 786 | tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT | TTEVT_FORK | TTEVT_VFORK; |
a7be7fa8 | 787 | tte.tte_events |= TTEVT_LWP_CREATE | TTEVT_LWP_EXIT | TTEVT_LWP_TERMINATE; |
7ba0e0c2 MK |
788 | #ifdef TTEVT_BPT_SSTEP |
789 | tte.tte_events |= TTEVT_BPT_SSTEP; | |
790 | #endif | |
b2a4db28 | 791 | tte.tte_opts |= TTEO_PROC_INHERIT; |
932936f0 MK |
792 | if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, |
793 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 794 | perror_with_name (("ttrace")); |
932936f0 | 795 | |
6a3cb8e8 PA |
796 | if (!target_is_pushed (ops)) |
797 | push_target (ops); | |
2935f27f | 798 | |
f688d93f | 799 | inf_ttrace_create_threads_after_attach (pid); |
eee22bf8 MK |
800 | } |
801 | ||
802 | static void | |
52554a0e | 803 | inf_ttrace_detach (struct target_ops *ops, const 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 | ||
6a3cb8e8 | 838 | inf_child_maybe_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 | ||
9b409511 | 1227 | static enum target_xfer_status |
eee22bf8 | 1228 | inf_ttrace_xfer_partial (struct target_ops *ops, enum target_object object, |
7a4609f7 | 1229 | const char *annex, gdb_byte *readbuf, |
3e43a32a | 1230 | const gdb_byte *writebuf, |
9b409511 | 1231 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
eee22bf8 MK |
1232 | { |
1233 | switch (object) | |
1234 | { | |
1235 | case TARGET_OBJECT_MEMORY: | |
9b409511 YQ |
1236 | { |
1237 | LONGEST val = inf_ttrace_xfer_memory (offset, len, readbuf, writebuf); | |
1238 | ||
1239 | if (val == 0) | |
1240 | return TARGET_XFER_EOF; | |
1241 | else | |
1242 | { | |
1243 | *xfered_len = (ULONGEST) val; | |
1244 | return TARGET_XFER_OK; | |
1245 | } | |
1246 | } | |
eee22bf8 MK |
1247 | |
1248 | case TARGET_OBJECT_UNWIND_TABLE: | |
2ed4b548 | 1249 | return TARGET_XFER_E_IO; |
eee22bf8 MK |
1250 | |
1251 | case TARGET_OBJECT_AUXV: | |
2ed4b548 | 1252 | return TARGET_XFER_E_IO; |
eee22bf8 MK |
1253 | |
1254 | case TARGET_OBJECT_WCOOKIE: | |
2ed4b548 | 1255 | return TARGET_XFER_E_IO; |
eee22bf8 MK |
1256 | |
1257 | default: | |
2ed4b548 | 1258 | return TARGET_XFER_E_IO; |
eee22bf8 MK |
1259 | } |
1260 | } | |
1261 | ||
1262 | /* Print status information about what we're accessing. */ | |
1263 | ||
1264 | static void | |
1265 | inf_ttrace_files_info (struct target_ops *ignore) | |
1266 | { | |
181e7f93 | 1267 | struct inferior *inf = current_inferior (); |
346e281c | 1268 | printf_filtered (_("\tUsing the running image of %s %s.\n"), |
181e7f93 | 1269 | inf->attach_flag ? "attached" : "child", |
346e281c | 1270 | target_pid_to_str (inferior_ptid)); |
eee22bf8 | 1271 | } |
a7be7fa8 MK |
1272 | |
1273 | static int | |
28439f5e | 1274 | inf_ttrace_thread_alive (struct target_ops *ops, ptid_t ptid) |
a7be7fa8 | 1275 | { |
438ac09b PA |
1276 | return 1; |
1277 | } | |
1278 | ||
1279 | /* Return a string describing the state of the thread specified by | |
1280 | INFO. */ | |
1281 | ||
1282 | static char * | |
c15906d8 TT |
1283 | inf_ttrace_extra_thread_info (struct target_ops *self, |
1284 | struct thread_info *info) | |
438ac09b PA |
1285 | { |
1286 | struct inf_ttrace_private_thread_info* private = | |
1287 | (struct inf_ttrace_private_thread_info *) info->private; | |
1288 | ||
1289 | if (private != NULL && private->dying) | |
1290 | return "Exiting"; | |
1291 | ||
1292 | return NULL; | |
a7be7fa8 MK |
1293 | } |
1294 | ||
1295 | static char * | |
117de6a9 | 1296 | inf_ttrace_pid_to_str (struct target_ops *ops, ptid_t ptid) |
a7be7fa8 | 1297 | { |
2935f27f PA |
1298 | pid_t pid = ptid_get_pid (ptid); |
1299 | lwpid_t lwpid = ptid_get_lwp (ptid); | |
1300 | static char buf[128]; | |
a7be7fa8 | 1301 | |
2935f27f PA |
1302 | if (lwpid == 0) |
1303 | xsnprintf (buf, sizeof buf, "process %ld", | |
1304 | (long) pid); | |
1305 | else | |
1306 | xsnprintf (buf, sizeof buf, "process %ld, lwp %ld", | |
1307 | (long) pid, (long) lwpid); | |
1308 | return buf; | |
a7be7fa8 | 1309 | } |
eee22bf8 MK |
1310 | \f |
1311 | ||
fa07e785 JB |
1312 | /* Implement the get_ada_task_ptid target_ops method. */ |
1313 | ||
1314 | static ptid_t | |
1e6b91a4 | 1315 | inf_ttrace_get_ada_task_ptid (struct target_ops *self, long lwp, long thread) |
fa07e785 JB |
1316 | { |
1317 | return ptid_build (ptid_get_pid (inferior_ptid), lwp, 0); | |
1318 | } | |
1319 | ||
1320 | \f | |
eee22bf8 MK |
1321 | struct target_ops * |
1322 | inf_ttrace_target (void) | |
1323 | { | |
1324 | struct target_ops *t = inf_child_target (); | |
1325 | ||
eee22bf8 MK |
1326 | t->to_attach = inf_ttrace_attach; |
1327 | t->to_detach = inf_ttrace_detach; | |
1328 | t->to_resume = inf_ttrace_resume; | |
1329 | t->to_wait = inf_ttrace_wait; | |
eee22bf8 | 1330 | t->to_files_info = inf_ttrace_files_info; |
932936f0 | 1331 | t->to_can_use_hw_breakpoint = inf_ttrace_can_use_hw_breakpoint; |
932936f0 MK |
1332 | t->to_insert_watchpoint = inf_ttrace_insert_watchpoint; |
1333 | t->to_remove_watchpoint = inf_ttrace_remove_watchpoint; | |
1334 | t->to_stopped_by_watchpoint = inf_ttrace_stopped_by_watchpoint; | |
2a3cdf79 WZ |
1335 | t->to_region_ok_for_hw_watchpoint = |
1336 | inf_ttrace_region_ok_for_hw_watchpoint; | |
346e281c MK |
1337 | t->to_kill = inf_ttrace_kill; |
1338 | t->to_create_inferior = inf_ttrace_create_inferior; | |
1339 | t->to_follow_fork = inf_ttrace_follow_fork; | |
1340 | t->to_mourn_inferior = inf_ttrace_mourn_inferior; | |
1341 | t->to_thread_alive = inf_ttrace_thread_alive; | |
438ac09b | 1342 | t->to_extra_thread_info = inf_ttrace_extra_thread_info; |
346e281c MK |
1343 | t->to_pid_to_str = inf_ttrace_pid_to_str; |
1344 | t->to_xfer_partial = inf_ttrace_xfer_partial; | |
fa07e785 | 1345 | t->to_get_ada_task_ptid = inf_ttrace_get_ada_task_ptid; |
eee22bf8 | 1346 | |
eee22bf8 MK |
1347 | return t; |
1348 | } | |
d3322e8a | 1349 | #endif |
932936f0 MK |
1350 | \f |
1351 | ||
1352 | /* Prevent warning from -Wmissing-prototypes. */ | |
0b155465 | 1353 | void _initialize_inf_ttrace (void); |
eee22bf8 | 1354 | |
932936f0 MK |
1355 | void |
1356 | _initialize_inf_ttrace (void) | |
1357 | { | |
d3322e8a | 1358 | #ifdef HAVE_TTRACE |
932936f0 | 1359 | inf_ttrace_page_dict.pagesize = getpagesize(); |
eee22bf8 | 1360 | #endif |
d3322e8a | 1361 | } |