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 MK |
31 | #include "target.h" |
32 | ||
33 | #include "gdb_assert.h" | |
0e9f083f | 34 | #include <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 | 197 | |
70ba0933 | 198 | page = XNEW (struct inf_ttrace_page); |
932936f0 MK |
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 | |
7bb99c53 TT |
317 | inf_ttrace_insert_watchpoint (struct target_ops *self, |
318 | CORE_ADDR addr, int len, int type, | |
0cf6dd15 | 319 | struct expression *cond) |
932936f0 MK |
320 | { |
321 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
322 | pid_t pid = ptid_get_pid (inferior_ptid); | |
323 | CORE_ADDR page_addr; | |
324 | int num_pages; | |
325 | int page; | |
326 | ||
327 | gdb_assert (type == hw_write); | |
328 | ||
329 | page_addr = (addr / pagesize) * pagesize; | |
330 | num_pages = (len + pagesize - 1) / pagesize; | |
331 | ||
332 | for (page = 0; page < num_pages; page++, page_addr += pagesize) | |
333 | inf_ttrace_insert_page (pid, page_addr); | |
334 | ||
335 | return 1; | |
336 | } | |
337 | ||
338 | /* Remove a "hardware" watchpoint for LEN bytes at address ADDR of | |
339 | type TYPE. */ | |
340 | ||
341 | static int | |
11b5219a TT |
342 | inf_ttrace_remove_watchpoint (struct target_ops *self, |
343 | CORE_ADDR addr, int len, int type, | |
0cf6dd15 | 344 | struct expression *cond) |
932936f0 MK |
345 | { |
346 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
347 | pid_t pid = ptid_get_pid (inferior_ptid); | |
348 | CORE_ADDR page_addr; | |
349 | int num_pages; | |
350 | int page; | |
351 | ||
352 | gdb_assert (type == hw_write); | |
353 | ||
354 | page_addr = (addr / pagesize) * pagesize; | |
355 | num_pages = (len + pagesize - 1) / pagesize; | |
356 | ||
357 | for (page = 0; page < num_pages; page++, page_addr += pagesize) | |
358 | inf_ttrace_remove_page (pid, page_addr); | |
359 | ||
360 | return 1; | |
361 | } | |
362 | ||
363 | static int | |
5461485a TT |
364 | inf_ttrace_can_use_hw_breakpoint (struct target_ops *self, |
365 | int type, int len, int ot) | |
932936f0 MK |
366 | { |
367 | return (type == bp_hardware_watchpoint); | |
368 | } | |
369 | ||
370 | static int | |
31568a15 TT |
371 | inf_ttrace_region_ok_for_hw_watchpoint (struct target_ops *self, |
372 | CORE_ADDR addr, int len) | |
932936f0 MK |
373 | { |
374 | return 1; | |
375 | } | |
376 | ||
377 | /* Return non-zero if the current inferior was (potentially) stopped | |
378 | by hitting a "hardware" watchpoint. */ | |
379 | ||
380 | static int | |
6a109b6b | 381 | inf_ttrace_stopped_by_watchpoint (struct target_ops *ops) |
932936f0 MK |
382 | { |
383 | pid_t pid = ptid_get_pid (inferior_ptid); | |
384 | lwpid_t lwpid = ptid_get_lwp (inferior_ptid); | |
385 | ttstate_t tts; | |
386 | ||
387 | if (inf_ttrace_page_dict.count > 0) | |
388 | { | |
389 | if (ttrace (TT_LWP_GET_STATE, pid, lwpid, | |
390 | (uintptr_t)&tts, sizeof tts, 0) == -1) | |
e2e0b3e5 | 391 | perror_with_name (("ttrace")); |
932936f0 MK |
392 | |
393 | if (tts.tts_event == TTEVT_SIGNAL | |
394 | && tts.tts_u.tts_signal.tts_signo == SIGBUS) | |
395 | { | |
396 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
397 | void *addr = tts.tts_u.tts_signal.tts_siginfo.si_addr; | |
398 | CORE_ADDR page_addr = ((uintptr_t)addr / pagesize) * pagesize; | |
399 | ||
400 | if (inf_ttrace_get_page (pid, page_addr)) | |
401 | return 1; | |
402 | } | |
403 | } | |
404 | ||
405 | return 0; | |
406 | } | |
407 | \f | |
eee22bf8 | 408 | |
b2a4db28 MK |
409 | /* When tracking a vfork(2), we cannot detach from the parent until |
410 | after the child has called exec(3) or has exited. If we are still | |
411 | attached to the parent, this variable will be set to the process ID | |
412 | of the parent. Otherwise it will be set to zero. */ | |
413 | static pid_t inf_ttrace_vfork_ppid = -1; | |
414 | ||
415 | static int | |
07107ca6 LM |
416 | inf_ttrace_follow_fork (struct target_ops *ops, int follow_child, |
417 | int detach_fork) | |
b2a4db28 MK |
418 | { |
419 | pid_t pid, fpid; | |
420 | lwpid_t lwpid, flwpid; | |
421 | ttstate_t tts; | |
e58b0e63 PA |
422 | struct thread_info *tp = inferior_thread (); |
423 | ||
424 | gdb_assert (tp->pending_follow.kind == TARGET_WAITKIND_FORKED | |
425 | || tp->pending_follow.kind == TARGET_WAITKIND_VFORKED); | |
426 | ||
427 | pid = ptid_get_pid (inferior_ptid); | |
428 | lwpid = ptid_get_lwp (inferior_ptid); | |
b2a4db28 MK |
429 | |
430 | /* Get all important details that core GDB doesn't (and shouldn't) | |
431 | know about. */ | |
432 | if (ttrace (TT_LWP_GET_STATE, pid, lwpid, | |
433 | (uintptr_t)&tts, sizeof tts, 0) == -1) | |
434 | perror_with_name (("ttrace")); | |
435 | ||
436 | gdb_assert (tts.tts_event == TTEVT_FORK || tts.tts_event == TTEVT_VFORK); | |
437 | ||
438 | if (tts.tts_u.tts_fork.tts_isparent) | |
439 | { | |
440 | pid = tts.tts_pid; | |
441 | lwpid = tts.tts_lwpid; | |
442 | fpid = tts.tts_u.tts_fork.tts_fpid; | |
443 | flwpid = tts.tts_u.tts_fork.tts_flwpid; | |
444 | } | |
445 | else | |
446 | { | |
447 | pid = tts.tts_u.tts_fork.tts_fpid; | |
448 | lwpid = tts.tts_u.tts_fork.tts_flwpid; | |
449 | fpid = tts.tts_pid; | |
450 | flwpid = tts.tts_lwpid; | |
451 | } | |
452 | ||
453 | if (follow_child) | |
454 | { | |
77435e4c | 455 | struct inferior *inf; |
191c4426 PA |
456 | struct inferior *parent_inf; |
457 | ||
458 | parent_inf = find_inferior_pid (pid); | |
77435e4c | 459 | |
b2a4db28 | 460 | inferior_ptid = ptid_build (fpid, flwpid, 0); |
77435e4c | 461 | inf = add_inferior (fpid); |
191c4426 | 462 | inf->attach_flag = parent_inf->attach_flag; |
6c95b8df PA |
463 | inf->pspace = parent_inf->pspace; |
464 | inf->aspace = parent_inf->aspace; | |
191c4426 | 465 | copy_terminal_info (inf, parent_inf); |
d80ee84f | 466 | detach_breakpoints (ptid_build (pid, lwpid, 0)); |
b2a4db28 MK |
467 | |
468 | target_terminal_ours (); | |
3e43a32a MS |
469 | fprintf_unfiltered (gdb_stdlog, |
470 | _("Attaching after fork to child process %ld.\n"), | |
471 | (long)fpid); | |
b2a4db28 MK |
472 | } |
473 | else | |
474 | { | |
475 | inferior_ptid = ptid_build (pid, lwpid, 0); | |
2dcc6086 JB |
476 | /* Detach any remaining breakpoints in the child. In the case |
477 | of fork events, we do not need to do this, because breakpoints | |
478 | should have already been removed earlier. */ | |
479 | if (tts.tts_event == TTEVT_VFORK) | |
d80ee84f | 480 | detach_breakpoints (ptid_build (fpid, flwpid, 0)); |
b2a4db28 MK |
481 | |
482 | target_terminal_ours (); | |
3e43a32a MS |
483 | fprintf_unfiltered (gdb_stdlog, |
484 | _("Detaching after fork from child process %ld.\n"), | |
485 | (long)fpid); | |
b2a4db28 MK |
486 | } |
487 | ||
488 | if (tts.tts_event == TTEVT_VFORK) | |
489 | { | |
490 | gdb_assert (!tts.tts_u.tts_fork.tts_isparent); | |
491 | ||
492 | if (follow_child) | |
493 | { | |
494 | /* We can't detach from the parent yet. */ | |
495 | inf_ttrace_vfork_ppid = pid; | |
496 | ||
497 | reattach_breakpoints (fpid); | |
498 | } | |
499 | else | |
500 | { | |
501 | if (ttrace (TT_PROC_DETACH, fpid, 0, 0, 0, 0) == -1) | |
502 | perror_with_name (("ttrace")); | |
503 | ||
504 | /* Wait till we get the TTEVT_VFORK event in the parent. | |
505 | This indicates that the child has called exec(3) or has | |
506 | exited and that the parent is ready to be traced again. */ | |
507 | if (ttrace_wait (pid, lwpid, TTRACE_WAITOK, &tts, sizeof tts) == -1) | |
508 | perror_with_name (("ttrace_wait")); | |
509 | gdb_assert (tts.tts_event == TTEVT_VFORK); | |
510 | gdb_assert (tts.tts_u.tts_fork.tts_isparent); | |
511 | ||
512 | reattach_breakpoints (pid); | |
513 | } | |
514 | } | |
515 | else | |
516 | { | |
517 | gdb_assert (tts.tts_u.tts_fork.tts_isparent); | |
518 | ||
519 | if (follow_child) | |
520 | { | |
521 | if (ttrace (TT_PROC_DETACH, pid, 0, 0, 0, 0) == -1) | |
522 | perror_with_name (("ttrace")); | |
523 | } | |
524 | else | |
525 | { | |
526 | if (ttrace (TT_PROC_DETACH, fpid, 0, 0, 0, 0) == -1) | |
527 | perror_with_name (("ttrace")); | |
528 | } | |
529 | } | |
530 | ||
531 | if (follow_child) | |
532 | { | |
2935f27f PA |
533 | struct thread_info *ti; |
534 | ||
b2a4db28 | 535 | /* The child will start out single-threaded. */ |
2935f27f | 536 | inf_ttrace_num_lwps = 1; |
b2a4db28 MK |
537 | inf_ttrace_num_lwps_in_syscall = 0; |
538 | ||
2935f27f PA |
539 | /* Delete parent. */ |
540 | delete_thread_silent (ptid_build (pid, lwpid, 0)); | |
7f9f62ba | 541 | detach_inferior (pid); |
2935f27f | 542 | |
7f9f62ba | 543 | /* Add child thread. inferior_ptid was already set above. */ |
2935f27f PA |
544 | ti = add_thread_silent (inferior_ptid); |
545 | ti->private = | |
546 | xmalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
547 | memset (ti->private, 0, | |
548 | sizeof (struct inf_ttrace_private_thread_info)); | |
b2a4db28 MK |
549 | } |
550 | ||
551 | return 0; | |
552 | } | |
553 | \f | |
554 | ||
eee22bf8 MK |
555 | /* File descriptors for pipes used as semaphores during initial |
556 | startup of an inferior. */ | |
557 | static int inf_ttrace_pfd1[2]; | |
558 | static int inf_ttrace_pfd2[2]; | |
559 | ||
560 | static void | |
561 | do_cleanup_pfds (void *dummy) | |
562 | { | |
563 | close (inf_ttrace_pfd1[0]); | |
564 | close (inf_ttrace_pfd1[1]); | |
565 | close (inf_ttrace_pfd2[0]); | |
566 | close (inf_ttrace_pfd2[1]); | |
21ff4686 TT |
567 | |
568 | unmark_fd_no_cloexec (inf_ttrace_pfd1[0]); | |
569 | unmark_fd_no_cloexec (inf_ttrace_pfd1[1]); | |
570 | unmark_fd_no_cloexec (inf_ttrace_pfd2[0]); | |
571 | unmark_fd_no_cloexec (inf_ttrace_pfd2[1]); | |
eee22bf8 MK |
572 | } |
573 | ||
574 | static void | |
575 | inf_ttrace_prepare (void) | |
576 | { | |
577 | if (pipe (inf_ttrace_pfd1) == -1) | |
a3f17187 | 578 | perror_with_name (("pipe")); |
eee22bf8 MK |
579 | |
580 | if (pipe (inf_ttrace_pfd2) == -1) | |
581 | { | |
582 | close (inf_ttrace_pfd1[0]); | |
583 | close (inf_ttrace_pfd2[0]); | |
a3f17187 | 584 | perror_with_name (("pipe")); |
eee22bf8 | 585 | } |
21ff4686 TT |
586 | |
587 | mark_fd_no_cloexec (inf_ttrace_pfd1[0]); | |
588 | mark_fd_no_cloexec (inf_ttrace_pfd1[1]); | |
589 | mark_fd_no_cloexec (inf_ttrace_pfd2[0]); | |
590 | mark_fd_no_cloexec (inf_ttrace_pfd2[1]); | |
eee22bf8 MK |
591 | } |
592 | ||
593 | /* Prepare to be traced. */ | |
594 | ||
595 | static void | |
596 | inf_ttrace_me (void) | |
597 | { | |
598 | struct cleanup *old_chain = make_cleanup (do_cleanup_pfds, 0); | |
599 | char c; | |
600 | ||
601 | /* "Trace me, Dr. Memory!" */ | |
602 | if (ttrace (TT_PROC_SETTRC, 0, 0, 0, TT_VERSION, 0) == -1) | |
e2e0b3e5 | 603 | perror_with_name (("ttrace")); |
eee22bf8 MK |
604 | |
605 | /* Tell our parent that we are ready to be traced. */ | |
606 | if (write (inf_ttrace_pfd1[1], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 607 | perror_with_name (("write")); |
eee22bf8 MK |
608 | |
609 | /* Wait until our parent has set the initial event mask. */ | |
610 | if (read (inf_ttrace_pfd2[0], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 611 | perror_with_name (("read")); |
eee22bf8 MK |
612 | |
613 | do_cleanups (old_chain); | |
614 | } | |
615 | ||
616 | /* Start tracing PID. */ | |
617 | ||
618 | static void | |
28439f5e | 619 | inf_ttrace_him (struct target_ops *ops, int pid) |
eee22bf8 MK |
620 | { |
621 | struct cleanup *old_chain = make_cleanup (do_cleanup_pfds, 0); | |
622 | ttevent_t tte; | |
eee22bf8 MK |
623 | char c; |
624 | ||
625 | /* Wait until our child is ready to be traced. */ | |
626 | if (read (inf_ttrace_pfd1[0], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 627 | perror_with_name (("read")); |
eee22bf8 MK |
628 | |
629 | /* Set the initial event mask. */ | |
630 | memset (&tte, 0, sizeof (tte)); | |
b2a4db28 | 631 | tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT | TTEVT_FORK | TTEVT_VFORK; |
a7be7fa8 | 632 | tte.tte_events |= TTEVT_LWP_CREATE | TTEVT_LWP_EXIT | TTEVT_LWP_TERMINATE; |
7ba0e0c2 MK |
633 | #ifdef TTEVT_BPT_SSTEP |
634 | tte.tte_events |= TTEVT_BPT_SSTEP; | |
635 | #endif | |
b2a4db28 | 636 | tte.tte_opts |= TTEO_PROC_INHERIT; |
eee22bf8 MK |
637 | if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, |
638 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 639 | perror_with_name (("ttrace")); |
eee22bf8 MK |
640 | |
641 | /* Tell our child that we have set the initial event mask. */ | |
642 | if (write (inf_ttrace_pfd2[1], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 643 | perror_with_name (("write")); |
eee22bf8 MK |
644 | |
645 | do_cleanups (old_chain); | |
646 | ||
28439f5e | 647 | push_target (ops); |
eee22bf8 | 648 | |
eee22bf8 MK |
649 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); |
650 | ||
651 | /* On some targets, there must be some explicit actions taken after | |
652 | the inferior has been started up. */ | |
653 | target_post_startup_inferior (pid_to_ptid (pid)); | |
654 | } | |
655 | ||
656 | static void | |
136d6dae VP |
657 | inf_ttrace_create_inferior (struct target_ops *ops, char *exec_file, |
658 | char *allargs, char **env, int from_tty) | |
eee22bf8 | 659 | { |
28439f5e PA |
660 | int pid; |
661 | ||
a7be7fa8 MK |
662 | gdb_assert (inf_ttrace_num_lwps == 0); |
663 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); | |
932936f0 | 664 | gdb_assert (inf_ttrace_page_dict.count == 0); |
932936f0 | 665 | gdb_assert (inf_ttrace_reenable_page_protections == 0); |
b2a4db28 | 666 | gdb_assert (inf_ttrace_vfork_ppid == -1); |
932936f0 | 667 | |
28439f5e | 668 | pid = fork_inferior (exec_file, allargs, env, inf_ttrace_me, NULL, |
e69860f1 | 669 | inf_ttrace_prepare, NULL, NULL); |
28439f5e PA |
670 | |
671 | inf_ttrace_him (ops, pid); | |
eee22bf8 MK |
672 | } |
673 | ||
eee22bf8 | 674 | static void |
136d6dae | 675 | inf_ttrace_mourn_inferior (struct target_ops *ops) |
eee22bf8 | 676 | { |
932936f0 MK |
677 | const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets); |
678 | int bucket; | |
679 | ||
a7be7fa8 MK |
680 | inf_ttrace_num_lwps = 0; |
681 | inf_ttrace_num_lwps_in_syscall = 0; | |
932936f0 MK |
682 | |
683 | for (bucket = 0; bucket < num_buckets; bucket++) | |
684 | { | |
685 | struct inf_ttrace_page *page; | |
686 | struct inf_ttrace_page *next; | |
687 | ||
688 | page = inf_ttrace_page_dict.buckets[bucket].next; | |
689 | while (page) | |
690 | { | |
691 | next = page->next; | |
692 | xfree (page); | |
693 | page = next; | |
694 | } | |
695 | } | |
696 | inf_ttrace_page_dict.count = 0; | |
697 | ||
28439f5e | 698 | unpush_target (ops); |
eee22bf8 MK |
699 | generic_mourn_inferior (); |
700 | } | |
701 | ||
f688d93f JB |
702 | /* Assuming we just attached the debugger to a new inferior, create |
703 | a new thread_info structure for each thread, and add it to our | |
704 | list of threads. */ | |
705 | ||
706 | static void | |
707 | inf_ttrace_create_threads_after_attach (int pid) | |
708 | { | |
709 | int status; | |
710 | ptid_t ptid; | |
711 | ttstate_t tts; | |
712 | struct thread_info *ti; | |
713 | ||
714 | status = ttrace (TT_PROC_GET_FIRST_LWP_STATE, pid, 0, | |
715 | (uintptr_t) &tts, sizeof (ttstate_t), 0); | |
716 | if (status < 0) | |
717 | perror_with_name (_("TT_PROC_GET_FIRST_LWP_STATE ttrace call failed")); | |
718 | gdb_assert (tts.tts_pid == pid); | |
719 | ||
720 | /* Add the stopped thread. */ | |
721 | ptid = ptid_build (pid, tts.tts_lwpid, 0); | |
722 | ti = add_thread (ptid); | |
723 | ti->private = xzalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
724 | inf_ttrace_num_lwps++; | |
725 | ||
726 | /* We use the "first stopped thread" as the currently active thread. */ | |
727 | inferior_ptid = ptid; | |
728 | ||
729 | /* Iterative over all the remaining threads. */ | |
730 | ||
731 | for (;;) | |
732 | { | |
733 | ptid_t ptid; | |
734 | ||
735 | status = ttrace (TT_PROC_GET_NEXT_LWP_STATE, pid, 0, | |
736 | (uintptr_t) &tts, sizeof (ttstate_t), 0); | |
737 | if (status < 0) | |
738 | perror_with_name (_("TT_PROC_GET_NEXT_LWP_STATE ttrace call failed")); | |
739 | if (status == 0) | |
740 | break; /* End of list. */ | |
741 | ||
742 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); | |
743 | ti = add_thread (ptid); | |
744 | ti->private = xzalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
745 | inf_ttrace_num_lwps++; | |
746 | } | |
747 | } | |
748 | ||
eee22bf8 | 749 | static void |
136d6dae | 750 | inf_ttrace_attach (struct target_ops *ops, char *args, int from_tty) |
eee22bf8 MK |
751 | { |
752 | char *exec_file; | |
753 | pid_t pid; | |
932936f0 | 754 | ttevent_t tte; |
181e7f93 | 755 | struct inferior *inf; |
eee22bf8 | 756 | |
74164c56 | 757 | pid = parse_pid_to_attach (args); |
eee22bf8 MK |
758 | |
759 | if (pid == getpid ()) /* Trying to masturbate? */ | |
8a3fe4f8 | 760 | error (_("I refuse to debug myself!")); |
eee22bf8 MK |
761 | |
762 | if (from_tty) | |
763 | { | |
346e281c | 764 | exec_file = get_exec_file (0); |
eee22bf8 MK |
765 | |
766 | if (exec_file) | |
a3f17187 | 767 | printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
eee22bf8 MK |
768 | target_pid_to_str (pid_to_ptid (pid))); |
769 | else | |
a3f17187 | 770 | printf_unfiltered (_("Attaching to %s\n"), |
eee22bf8 MK |
771 | target_pid_to_str (pid_to_ptid (pid))); |
772 | ||
773 | gdb_flush (gdb_stdout); | |
774 | } | |
775 | ||
a7be7fa8 MK |
776 | gdb_assert (inf_ttrace_num_lwps == 0); |
777 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); | |
b2a4db28 | 778 | gdb_assert (inf_ttrace_vfork_ppid == -1); |
a7be7fa8 | 779 | |
eee22bf8 | 780 | if (ttrace (TT_PROC_ATTACH, pid, 0, TT_KILL_ON_EXIT, TT_VERSION, 0) == -1) |
e2e0b3e5 | 781 | perror_with_name (("ttrace")); |
eee22bf8 | 782 | |
6c95b8df PA |
783 | inf = current_inferior (); |
784 | inferior_appeared (inf, pid); | |
181e7f93 | 785 | inf->attach_flag = 1; |
7f9f62ba | 786 | |
932936f0 | 787 | /* Set the initial event mask. */ |
932936f0 | 788 | memset (&tte, 0, sizeof (tte)); |
b2a4db28 | 789 | tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT | TTEVT_FORK | TTEVT_VFORK; |
a7be7fa8 | 790 | tte.tte_events |= TTEVT_LWP_CREATE | TTEVT_LWP_EXIT | TTEVT_LWP_TERMINATE; |
7ba0e0c2 MK |
791 | #ifdef TTEVT_BPT_SSTEP |
792 | tte.tte_events |= TTEVT_BPT_SSTEP; | |
793 | #endif | |
b2a4db28 | 794 | tte.tte_opts |= TTEO_PROC_INHERIT; |
932936f0 MK |
795 | if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, |
796 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 797 | perror_with_name (("ttrace")); |
932936f0 | 798 | |
28439f5e | 799 | push_target (ops); |
2935f27f | 800 | |
f688d93f | 801 | inf_ttrace_create_threads_after_attach (pid); |
eee22bf8 MK |
802 | } |
803 | ||
804 | static void | |
52554a0e | 805 | inf_ttrace_detach (struct target_ops *ops, const char *args, int from_tty) |
eee22bf8 | 806 | { |
eee22bf8 | 807 | pid_t pid = ptid_get_pid (inferior_ptid); |
5d426ff1 | 808 | int sig = 0; |
eee22bf8 MK |
809 | |
810 | if (from_tty) | |
811 | { | |
812 | char *exec_file = get_exec_file (0); | |
813 | if (exec_file == 0) | |
814 | exec_file = ""; | |
a3f17187 | 815 | printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file, |
eee22bf8 MK |
816 | target_pid_to_str (pid_to_ptid (pid))); |
817 | gdb_flush (gdb_stdout); | |
818 | } | |
819 | if (args) | |
820 | sig = atoi (args); | |
821 | ||
822 | /* ??? The HP-UX 11.0 ttrace(2) manual page doesn't mention that we | |
823 | can pass a signal number here. Does this really work? */ | |
824 | if (ttrace (TT_PROC_DETACH, pid, 0, 0, sig, 0) == -1) | |
e2e0b3e5 | 825 | perror_with_name (("ttrace")); |
eee22bf8 | 826 | |
b2a4db28 MK |
827 | if (inf_ttrace_vfork_ppid != -1) |
828 | { | |
829 | if (ttrace (TT_PROC_DETACH, inf_ttrace_vfork_ppid, 0, 0, 0, 0) == -1) | |
830 | perror_with_name (("ttrace")); | |
831 | inf_ttrace_vfork_ppid = -1; | |
832 | } | |
833 | ||
a7be7fa8 MK |
834 | inf_ttrace_num_lwps = 0; |
835 | inf_ttrace_num_lwps_in_syscall = 0; | |
932936f0 | 836 | |
932936f0 | 837 | inferior_ptid = null_ptid; |
7f9f62ba PA |
838 | detach_inferior (pid); |
839 | ||
28439f5e | 840 | unpush_target (ops); |
eee22bf8 MK |
841 | } |
842 | ||
346e281c | 843 | static void |
7d85a9c0 | 844 | inf_ttrace_kill (struct target_ops *ops) |
346e281c MK |
845 | { |
846 | pid_t pid = ptid_get_pid (inferior_ptid); | |
847 | ||
848 | if (pid == 0) | |
849 | return; | |
850 | ||
851 | if (ttrace (TT_PROC_EXIT, pid, 0, 0, 0, 0) == -1) | |
852 | perror_with_name (("ttrace")); | |
853 | /* ??? Is it necessary to call ttrace_wait() here? */ | |
854 | ||
855 | if (inf_ttrace_vfork_ppid != -1) | |
856 | { | |
857 | if (ttrace (TT_PROC_DETACH, inf_ttrace_vfork_ppid, 0, 0, 0, 0) == -1) | |
858 | perror_with_name (("ttrace")); | |
859 | inf_ttrace_vfork_ppid = -1; | |
860 | } | |
861 | ||
862 | target_mourn_inferior (); | |
863 | } | |
864 | ||
438ac09b PA |
865 | /* Check is a dying thread is dead by now, and delete it from GDBs |
866 | thread list if so. */ | |
7ba0e0c2 | 867 | static int |
438ac09b | 868 | inf_ttrace_delete_dead_threads_callback (struct thread_info *info, void *arg) |
7ba0e0c2 | 869 | { |
438ac09b PA |
870 | lwpid_t lwpid; |
871 | struct inf_ttrace_private_thread_info *p; | |
7ba0e0c2 | 872 | |
438ac09b PA |
873 | if (is_exited (info->ptid)) |
874 | return 0; | |
875 | ||
876 | lwpid = ptid_get_lwp (info->ptid); | |
877 | p = (struct inf_ttrace_private_thread_info *) info->private; | |
878 | ||
879 | /* Check if an lwp that was dying is still there or not. */ | |
880 | if (p->dying && (kill (lwpid, 0) == -1)) | |
881 | /* It's gone now. */ | |
882 | delete_thread (info->ptid); | |
7ba0e0c2 MK |
883 | |
884 | return 0; | |
885 | } | |
886 | ||
438ac09b PA |
887 | /* Resume the lwp pointed to by INFO, with REQUEST, and pass it signal |
888 | SIG. */ | |
889 | ||
890 | static void | |
891 | inf_ttrace_resume_lwp (struct thread_info *info, ttreq_t request, int sig) | |
892 | { | |
893 | pid_t pid = ptid_get_pid (info->ptid); | |
894 | lwpid_t lwpid = ptid_get_lwp (info->ptid); | |
895 | ||
896 | if (ttrace (request, pid, lwpid, TT_NOPC, sig, 0) == -1) | |
897 | { | |
898 | struct inf_ttrace_private_thread_info *p | |
899 | = (struct inf_ttrace_private_thread_info *) info->private; | |
900 | if (p->dying && errno == EPROTO) | |
901 | /* This is expected, it means the dying lwp is really gone | |
902 | by now. If ttrace had an event to inform the debugger | |
903 | the lwp is really gone, this wouldn't be needed. */ | |
904 | delete_thread (info->ptid); | |
905 | else | |
906 | /* This was really unexpected. */ | |
907 | perror_with_name (("ttrace")); | |
908 | } | |
909 | } | |
910 | ||
911 | /* Callback for iterate_over_threads. */ | |
912 | ||
60e2c248 | 913 | static int |
438ac09b | 914 | inf_ttrace_resume_callback (struct thread_info *info, void *arg) |
60e2c248 | 915 | { |
438ac09b PA |
916 | if (!ptid_equal (info->ptid, inferior_ptid) && !is_exited (info->ptid)) |
917 | inf_ttrace_resume_lwp (info, TT_LWP_CONTINUE, 0); | |
918 | ||
60e2c248 JG |
919 | return 0; |
920 | } | |
921 | ||
eee22bf8 | 922 | static void |
28439f5e | 923 | inf_ttrace_resume (struct target_ops *ops, |
2ea28649 | 924 | ptid_t ptid, int step, enum gdb_signal signal) |
eee22bf8 | 925 | { |
438ac09b | 926 | int resume_all; |
eee22bf8 | 927 | ttreq_t request = step ? TT_LWP_SINGLE : TT_LWP_CONTINUE; |
2ea28649 | 928 | int sig = gdb_signal_to_host (signal); |
438ac09b | 929 | struct thread_info *info; |
eee22bf8 | 930 | |
438ac09b PA |
931 | /* A specific PTID means `step only this process id'. */ |
932 | resume_all = (ptid_equal (ptid, minus_one_ptid)); | |
eee22bf8 | 933 | |
438ac09b PA |
934 | /* If resuming all threads, it's the current thread that should be |
935 | handled specially. */ | |
936 | if (resume_all) | |
937 | ptid = inferior_ptid; | |
eee22bf8 | 938 | |
e09875d4 | 939 | info = find_thread_ptid (ptid); |
438ac09b PA |
940 | inf_ttrace_resume_lwp (info, request, sig); |
941 | ||
942 | if (resume_all) | |
943 | /* Let all the other threads run too. */ | |
944 | iterate_over_threads (inf_ttrace_resume_callback, NULL); | |
eee22bf8 MK |
945 | } |
946 | ||
947 | static ptid_t | |
117de6a9 | 948 | inf_ttrace_wait (struct target_ops *ops, |
47608cb1 | 949 | ptid_t ptid, struct target_waitstatus *ourstatus, int options) |
eee22bf8 MK |
950 | { |
951 | pid_t pid = ptid_get_pid (ptid); | |
952 | lwpid_t lwpid = ptid_get_lwp (ptid); | |
953 | ttstate_t tts; | |
60e2c248 | 954 | struct thread_info *ti; |
3a3e9ee3 | 955 | ptid_t related_ptid; |
eee22bf8 | 956 | |
932936f0 | 957 | /* Until proven otherwise. */ |
a7be7fa8 | 958 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; |
eee22bf8 MK |
959 | |
960 | if (pid == -1) | |
b2a4db28 | 961 | pid = lwpid = 0; |
eee22bf8 | 962 | |
b2a4db28 | 963 | gdb_assert (pid != 0 || lwpid == 0); |
eee22bf8 MK |
964 | |
965 | do | |
966 | { | |
967 | set_sigint_trap (); | |
eee22bf8 MK |
968 | |
969 | if (ttrace_wait (pid, lwpid, TTRACE_WAITOK, &tts, sizeof tts) == -1) | |
a3f17187 | 970 | perror_with_name (("ttrace_wait")); |
eee22bf8 | 971 | |
b2a4db28 MK |
972 | if (tts.tts_event == TTEVT_VFORK && tts.tts_u.tts_fork.tts_isparent) |
973 | { | |
974 | if (inf_ttrace_vfork_ppid != -1) | |
975 | { | |
976 | gdb_assert (inf_ttrace_vfork_ppid == tts.tts_pid); | |
977 | ||
978 | if (ttrace (TT_PROC_DETACH, tts.tts_pid, 0, 0, 0, 0) == -1) | |
979 | perror_with_name (("ttrace")); | |
980 | inf_ttrace_vfork_ppid = -1; | |
981 | } | |
982 | ||
983 | tts.tts_event = TTEVT_NONE; | |
984 | } | |
985 | ||
eee22bf8 MK |
986 | clear_sigint_trap (); |
987 | } | |
988 | while (tts.tts_event == TTEVT_NONE); | |
989 | ||
932936f0 MK |
990 | /* Now that we've waited, we can re-enable the page protections. */ |
991 | if (inf_ttrace_reenable_page_protections) | |
992 | { | |
a7be7fa8 | 993 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); |
932936f0 MK |
994 | inf_ttrace_enable_page_protections (tts.tts_pid); |
995 | inf_ttrace_reenable_page_protections = 0; | |
996 | } | |
997 | ||
a7be7fa8 MK |
998 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); |
999 | ||
2935f27f PA |
1000 | if (inf_ttrace_num_lwps == 0) |
1001 | { | |
1002 | struct thread_info *ti; | |
1003 | ||
1004 | inf_ttrace_num_lwps = 1; | |
1005 | ||
1006 | /* This is the earliest we hear about the lwp member of | |
1007 | INFERIOR_PTID, after an attach or fork_inferior. */ | |
1008 | gdb_assert (ptid_get_lwp (inferior_ptid) == 0); | |
1009 | ||
1010 | /* We haven't set the private member on the main thread yet. Do | |
1011 | it now. */ | |
e09875d4 | 1012 | ti = find_thread_ptid (inferior_ptid); |
2935f27f PA |
1013 | gdb_assert (ti != NULL && ti->private == NULL); |
1014 | ti->private = | |
1015 | xmalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
1016 | memset (ti->private, 0, | |
1017 | sizeof (struct inf_ttrace_private_thread_info)); | |
1018 | ||
1019 | /* Notify the core that this ptid changed. This changes | |
1020 | inferior_ptid as well. */ | |
1021 | thread_change_ptid (inferior_ptid, ptid); | |
1022 | } | |
1023 | ||
eee22bf8 MK |
1024 | switch (tts.tts_event) |
1025 | { | |
7ba0e0c2 MK |
1026 | #ifdef TTEVT_BPT_SSTEP |
1027 | case TTEVT_BPT_SSTEP: | |
1028 | /* Make it look like a breakpoint. */ | |
1029 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 1030 | ourstatus->value.sig = GDB_SIGNAL_TRAP; |
7ba0e0c2 MK |
1031 | break; |
1032 | #endif | |
1033 | ||
eee22bf8 | 1034 | case TTEVT_EXEC: |
5d426ff1 MK |
1035 | ourstatus->kind = TARGET_WAITKIND_EXECD; |
1036 | ourstatus->value.execd_pathname = | |
1037 | xmalloc (tts.tts_u.tts_exec.tts_pathlen + 1); | |
1038 | if (ttrace (TT_PROC_GET_PATHNAME, tts.tts_pid, 0, | |
1039 | (uintptr_t)ourstatus->value.execd_pathname, | |
1040 | tts.tts_u.tts_exec.tts_pathlen, 0) == -1) | |
1041 | perror_with_name (("ttrace")); | |
1042 | ourstatus->value.execd_pathname[tts.tts_u.tts_exec.tts_pathlen] = 0; | |
25b22b0a PA |
1043 | |
1044 | /* At this point, all inserted breakpoints are gone. Doing this | |
1045 | as soon as we detect an exec prevents the badness of deleting | |
1046 | a breakpoint writing the current "shadow contents" to lift | |
1047 | the bp. That shadow is NOT valid after an exec. */ | |
1048 | mark_breakpoints_out (); | |
eee22bf8 | 1049 | break; |
932936f0 | 1050 | |
eee22bf8 MK |
1051 | case TTEVT_EXIT: |
1052 | store_waitstatus (ourstatus, tts.tts_u.tts_exit.tts_exitcode); | |
a7be7fa8 MK |
1053 | inf_ttrace_num_lwps = 0; |
1054 | break; | |
1055 | ||
b2a4db28 | 1056 | case TTEVT_FORK: |
3a3e9ee3 PA |
1057 | related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid, |
1058 | tts.tts_u.tts_fork.tts_flwpid, 0); | |
1059 | ||
b2a4db28 | 1060 | ourstatus->kind = TARGET_WAITKIND_FORKED; |
3a3e9ee3 | 1061 | ourstatus->value.related_pid = related_ptid; |
b2a4db28 MK |
1062 | |
1063 | /* Make sure the other end of the fork is stopped too. */ | |
1064 | if (ttrace_wait (tts.tts_u.tts_fork.tts_fpid, | |
1065 | tts.tts_u.tts_fork.tts_flwpid, | |
1066 | TTRACE_WAITOK, &tts, sizeof tts) == -1) | |
1067 | perror_with_name (("ttrace_wait")); | |
1068 | ||
1069 | gdb_assert (tts.tts_event == TTEVT_FORK); | |
1070 | if (tts.tts_u.tts_fork.tts_isparent) | |
1071 | { | |
3a3e9ee3 PA |
1072 | related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid, |
1073 | tts.tts_u.tts_fork.tts_flwpid, 0); | |
b2a4db28 | 1074 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); |
3a3e9ee3 | 1075 | ourstatus->value.related_pid = related_ptid; |
b2a4db28 MK |
1076 | } |
1077 | break; | |
1078 | ||
1079 | case TTEVT_VFORK: | |
1080 | gdb_assert (!tts.tts_u.tts_fork.tts_isparent); | |
1081 | ||
3a3e9ee3 PA |
1082 | related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid, |
1083 | tts.tts_u.tts_fork.tts_flwpid, 0); | |
1084 | ||
b2a4db28 | 1085 | ourstatus->kind = TARGET_WAITKIND_VFORKED; |
3a3e9ee3 | 1086 | ourstatus->value.related_pid = related_ptid; |
b2a4db28 MK |
1087 | |
1088 | /* HACK: To avoid touching the parent during the vfork, switch | |
1089 | away from it. */ | |
1090 | inferior_ptid = ptid; | |
1091 | break; | |
1092 | ||
a7be7fa8 MK |
1093 | case TTEVT_LWP_CREATE: |
1094 | lwpid = tts.tts_u.tts_thread.tts_target_lwpid; | |
1095 | ptid = ptid_build (tts.tts_pid, lwpid, 0); | |
60e2c248 JG |
1096 | ti = add_thread (ptid); |
1097 | ti->private = | |
1098 | xmalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
1099 | memset (ti->private, 0, | |
1100 | sizeof (struct inf_ttrace_private_thread_info)); | |
a7be7fa8 MK |
1101 | inf_ttrace_num_lwps++; |
1102 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); | |
62a93fa9 PA |
1103 | /* Let the lwp_create-caller thread continue. */ |
1104 | ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid), | |
1105 | ptid_get_lwp (ptid), TT_NOPC, 0, 0); | |
1106 | /* Return without stopping the whole process. */ | |
1107 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
1108 | return ptid; | |
a7be7fa8 MK |
1109 | |
1110 | case TTEVT_LWP_EXIT: | |
17faa917 DJ |
1111 | if (print_thread_events) |
1112 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (ptid)); | |
e09875d4 | 1113 | ti = find_thread_ptid (ptid); |
60e2c248 JG |
1114 | gdb_assert (ti != NULL); |
1115 | ((struct inf_ttrace_private_thread_info *)ti->private)->dying = 1; | |
a7be7fa8 | 1116 | inf_ttrace_num_lwps--; |
62a93fa9 | 1117 | /* Let the thread really exit. */ |
60e2c248 JG |
1118 | ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid), |
1119 | ptid_get_lwp (ptid), TT_NOPC, 0, 0); | |
62a93fa9 PA |
1120 | /* Return without stopping the whole process. */ |
1121 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
1122 | return ptid; | |
a7be7fa8 MK |
1123 | |
1124 | case TTEVT_LWP_TERMINATE: | |
1125 | lwpid = tts.tts_u.tts_thread.tts_target_lwpid; | |
1126 | ptid = ptid_build (tts.tts_pid, lwpid, 0); | |
62a93fa9 | 1127 | if (print_thread_events) |
b861ac81 | 1128 | printf_unfiltered(_("[%s has been terminated]\n"), |
62a93fa9 | 1129 | target_pid_to_str (ptid)); |
e09875d4 | 1130 | ti = find_thread_ptid (ptid); |
60e2c248 JG |
1131 | gdb_assert (ti != NULL); |
1132 | ((struct inf_ttrace_private_thread_info *)ti->private)->dying = 1; | |
a7be7fa8 | 1133 | inf_ttrace_num_lwps--; |
62a93fa9 PA |
1134 | |
1135 | /* Resume the lwp_terminate-caller thread. */ | |
a7be7fa8 | 1136 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); |
62a93fa9 PA |
1137 | ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid), |
1138 | ptid_get_lwp (ptid), TT_NOPC, 0, 0); | |
1139 | /* Return without stopping the whole process. */ | |
1140 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
1141 | return ptid; | |
932936f0 | 1142 | |
eee22bf8 MK |
1143 | case TTEVT_SIGNAL: |
1144 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
1145 | ourstatus->value.sig = | |
2ea28649 | 1146 | gdb_signal_from_host (tts.tts_u.tts_signal.tts_signo); |
eee22bf8 | 1147 | break; |
932936f0 MK |
1148 | |
1149 | case TTEVT_SYSCALL_ENTRY: | |
1150 | gdb_assert (inf_ttrace_reenable_page_protections == 0); | |
a7be7fa8 MK |
1151 | inf_ttrace_num_lwps_in_syscall++; |
1152 | if (inf_ttrace_num_lwps_in_syscall == 1) | |
932936f0 MK |
1153 | { |
1154 | /* A thread has just entered a system call. Disable any | |
1155 | page protections as the kernel can't deal with them. */ | |
1156 | inf_ttrace_disable_page_protections (tts.tts_pid); | |
1157 | } | |
1158 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_ENTRY; | |
01dedca2 | 1159 | ourstatus->value.syscall_number = tts.tts_scno; |
932936f0 MK |
1160 | break; |
1161 | ||
1162 | case TTEVT_SYSCALL_RETURN: | |
a7be7fa8 | 1163 | if (inf_ttrace_num_lwps_in_syscall > 0) |
932936f0 MK |
1164 | { |
1165 | /* If the last thread has just left the system call, this | |
1166 | would be a logical place to re-enable the page | |
1167 | protections, but that doesn't work. We can't re-enable | |
1168 | them until we've done another wait. */ | |
1169 | inf_ttrace_reenable_page_protections = | |
a7be7fa8 MK |
1170 | (inf_ttrace_num_lwps_in_syscall == 1); |
1171 | inf_ttrace_num_lwps_in_syscall--; | |
932936f0 MK |
1172 | } |
1173 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_RETURN; | |
01dedca2 | 1174 | ourstatus->value.syscall_number = tts.tts_scno; |
932936f0 | 1175 | break; |
a7be7fa8 MK |
1176 | |
1177 | default: | |
1178 | gdb_assert (!"Unexpected ttrace event"); | |
1179 | break; | |
eee22bf8 MK |
1180 | } |
1181 | ||
1182 | /* Make sure all threads within the process are stopped. */ | |
1183 | if (ttrace (TT_PROC_STOP, tts.tts_pid, 0, 0, 0, 0) == -1) | |
e2e0b3e5 | 1184 | perror_with_name (("ttrace")); |
eee22bf8 | 1185 | |
438ac09b PA |
1186 | /* Now that the whole process is stopped, check if any dying thread |
1187 | is really dead by now. If a dying thread is still alive, it will | |
1188 | be stopped too, and will still show up in `info threads', tagged | |
1189 | with "(Exiting)". We could make `info threads' prune dead | |
1190 | threads instead via inf_ttrace_thread_alive, but doing this here | |
1191 | has the advantage that a frontend is notificed sooner of thread | |
1192 | exits. Note that a dying lwp is still alive, it still has to be | |
1193 | resumed, like any other lwp. */ | |
1194 | iterate_over_threads (inf_ttrace_delete_dead_threads_callback, NULL); | |
1195 | ||
a7be7fa8 | 1196 | return ptid; |
eee22bf8 MK |
1197 | } |
1198 | ||
1199 | /* Transfer LEN bytes from ADDR in the inferior's memory into READBUF, | |
1200 | and transfer LEN bytes from WRITEBUF into the inferior's memory at | |
1201 | ADDR. Either READBUF or WRITEBUF may be null, in which case the | |
1202 | corresponding transfer doesn't happen. Return the number of bytes | |
1203 | actually transferred (which may be zero if an error occurs). */ | |
1204 | ||
1205 | static LONGEST | |
1206 | inf_ttrace_xfer_memory (CORE_ADDR addr, ULONGEST len, | |
1207 | void *readbuf, const void *writebuf) | |
1208 | { | |
1209 | pid_t pid = ptid_get_pid (inferior_ptid); | |
1210 | ||
1211 | /* HP-UX treats text space and data space differently. GDB however, | |
1212 | doesn't really know the difference. Therefore we try both. Try | |
1213 | text space before data space though because when we're writing | |
1214 | into text space the instruction cache might need to be flushed. */ | |
1215 | ||
1216 | if (readbuf | |
1217 | && ttrace (TT_PROC_RDTEXT, pid, 0, addr, len, (uintptr_t)readbuf) == -1 | |
1218 | && ttrace (TT_PROC_RDDATA, pid, 0, addr, len, (uintptr_t)readbuf) == -1) | |
1219 | return 0; | |
1220 | ||
1221 | if (writebuf | |
1222 | && ttrace (TT_PROC_WRTEXT, pid, 0, addr, len, (uintptr_t)writebuf) == -1 | |
1223 | && ttrace (TT_PROC_WRDATA, pid, 0, addr, len, (uintptr_t)writebuf) == -1) | |
1224 | return 0; | |
1225 | ||
1226 | return len; | |
1227 | } | |
1228 | ||
9b409511 | 1229 | static enum target_xfer_status |
eee22bf8 | 1230 | inf_ttrace_xfer_partial (struct target_ops *ops, enum target_object object, |
7a4609f7 | 1231 | const char *annex, gdb_byte *readbuf, |
3e43a32a | 1232 | const gdb_byte *writebuf, |
9b409511 | 1233 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
eee22bf8 MK |
1234 | { |
1235 | switch (object) | |
1236 | { | |
1237 | case TARGET_OBJECT_MEMORY: | |
9b409511 YQ |
1238 | { |
1239 | LONGEST val = inf_ttrace_xfer_memory (offset, len, readbuf, writebuf); | |
1240 | ||
1241 | if (val == 0) | |
1242 | return TARGET_XFER_EOF; | |
1243 | else | |
1244 | { | |
1245 | *xfered_len = (ULONGEST) val; | |
1246 | return TARGET_XFER_OK; | |
1247 | } | |
1248 | } | |
eee22bf8 MK |
1249 | |
1250 | case TARGET_OBJECT_UNWIND_TABLE: | |
2ed4b548 | 1251 | return TARGET_XFER_E_IO; |
eee22bf8 MK |
1252 | |
1253 | case TARGET_OBJECT_AUXV: | |
2ed4b548 | 1254 | return TARGET_XFER_E_IO; |
eee22bf8 MK |
1255 | |
1256 | case TARGET_OBJECT_WCOOKIE: | |
2ed4b548 | 1257 | return TARGET_XFER_E_IO; |
eee22bf8 MK |
1258 | |
1259 | default: | |
2ed4b548 | 1260 | return TARGET_XFER_E_IO; |
eee22bf8 MK |
1261 | } |
1262 | } | |
1263 | ||
1264 | /* Print status information about what we're accessing. */ | |
1265 | ||
1266 | static void | |
1267 | inf_ttrace_files_info (struct target_ops *ignore) | |
1268 | { | |
181e7f93 | 1269 | struct inferior *inf = current_inferior (); |
346e281c | 1270 | printf_filtered (_("\tUsing the running image of %s %s.\n"), |
181e7f93 | 1271 | inf->attach_flag ? "attached" : "child", |
346e281c | 1272 | target_pid_to_str (inferior_ptid)); |
eee22bf8 | 1273 | } |
a7be7fa8 MK |
1274 | |
1275 | static int | |
28439f5e | 1276 | inf_ttrace_thread_alive (struct target_ops *ops, ptid_t ptid) |
a7be7fa8 | 1277 | { |
438ac09b PA |
1278 | return 1; |
1279 | } | |
1280 | ||
1281 | /* Return a string describing the state of the thread specified by | |
1282 | INFO. */ | |
1283 | ||
1284 | static char * | |
c15906d8 TT |
1285 | inf_ttrace_extra_thread_info (struct target_ops *self, |
1286 | struct thread_info *info) | |
438ac09b PA |
1287 | { |
1288 | struct inf_ttrace_private_thread_info* private = | |
1289 | (struct inf_ttrace_private_thread_info *) info->private; | |
1290 | ||
1291 | if (private != NULL && private->dying) | |
1292 | return "Exiting"; | |
1293 | ||
1294 | return NULL; | |
a7be7fa8 MK |
1295 | } |
1296 | ||
1297 | static char * | |
117de6a9 | 1298 | inf_ttrace_pid_to_str (struct target_ops *ops, ptid_t ptid) |
a7be7fa8 | 1299 | { |
2935f27f PA |
1300 | pid_t pid = ptid_get_pid (ptid); |
1301 | lwpid_t lwpid = ptid_get_lwp (ptid); | |
1302 | static char buf[128]; | |
a7be7fa8 | 1303 | |
2935f27f PA |
1304 | if (lwpid == 0) |
1305 | xsnprintf (buf, sizeof buf, "process %ld", | |
1306 | (long) pid); | |
1307 | else | |
1308 | xsnprintf (buf, sizeof buf, "process %ld, lwp %ld", | |
1309 | (long) pid, (long) lwpid); | |
1310 | return buf; | |
a7be7fa8 | 1311 | } |
eee22bf8 MK |
1312 | \f |
1313 | ||
fa07e785 JB |
1314 | /* Implement the get_ada_task_ptid target_ops method. */ |
1315 | ||
1316 | static ptid_t | |
1317 | inf_ttrace_get_ada_task_ptid (long lwp, long thread) | |
1318 | { | |
1319 | return ptid_build (ptid_get_pid (inferior_ptid), lwp, 0); | |
1320 | } | |
1321 | ||
1322 | \f | |
eee22bf8 MK |
1323 | struct target_ops * |
1324 | inf_ttrace_target (void) | |
1325 | { | |
1326 | struct target_ops *t = inf_child_target (); | |
1327 | ||
eee22bf8 MK |
1328 | t->to_attach = inf_ttrace_attach; |
1329 | t->to_detach = inf_ttrace_detach; | |
1330 | t->to_resume = inf_ttrace_resume; | |
1331 | t->to_wait = inf_ttrace_wait; | |
eee22bf8 | 1332 | t->to_files_info = inf_ttrace_files_info; |
932936f0 | 1333 | t->to_can_use_hw_breakpoint = inf_ttrace_can_use_hw_breakpoint; |
932936f0 MK |
1334 | t->to_insert_watchpoint = inf_ttrace_insert_watchpoint; |
1335 | t->to_remove_watchpoint = inf_ttrace_remove_watchpoint; | |
1336 | t->to_stopped_by_watchpoint = inf_ttrace_stopped_by_watchpoint; | |
2a3cdf79 WZ |
1337 | t->to_region_ok_for_hw_watchpoint = |
1338 | inf_ttrace_region_ok_for_hw_watchpoint; | |
346e281c MK |
1339 | t->to_kill = inf_ttrace_kill; |
1340 | t->to_create_inferior = inf_ttrace_create_inferior; | |
1341 | t->to_follow_fork = inf_ttrace_follow_fork; | |
1342 | t->to_mourn_inferior = inf_ttrace_mourn_inferior; | |
1343 | t->to_thread_alive = inf_ttrace_thread_alive; | |
438ac09b | 1344 | t->to_extra_thread_info = inf_ttrace_extra_thread_info; |
346e281c MK |
1345 | t->to_pid_to_str = inf_ttrace_pid_to_str; |
1346 | t->to_xfer_partial = inf_ttrace_xfer_partial; | |
fa07e785 | 1347 | t->to_get_ada_task_ptid = inf_ttrace_get_ada_task_ptid; |
eee22bf8 | 1348 | |
eee22bf8 MK |
1349 | return t; |
1350 | } | |
d3322e8a | 1351 | #endif |
932936f0 MK |
1352 | \f |
1353 | ||
1354 | /* Prevent warning from -Wmissing-prototypes. */ | |
0b155465 | 1355 | void _initialize_inf_ttrace (void); |
eee22bf8 | 1356 | |
932936f0 MK |
1357 | void |
1358 | _initialize_inf_ttrace (void) | |
1359 | { | |
d3322e8a | 1360 | #ifdef HAVE_TTRACE |
932936f0 | 1361 | inf_ttrace_page_dict.pagesize = getpagesize(); |
eee22bf8 | 1362 | #endif |
d3322e8a | 1363 | } |