Commit | Line | Data |
---|---|---|
eee22bf8 MK |
1 | /* Low-level child interface to ttrace. |
2 | ||
0fb0cc75 JB |
3 | Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 |
4 | Free Software Foundation, Inc. | |
eee22bf8 MK |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
eee22bf8 MK |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
eee22bf8 MK |
20 | |
21 | #include "defs.h" | |
22 | ||
23 | /* The ttrace(2) system call didn't exist before HP-UX 10.30. Don't | |
24 | try to compile this code unless we have it. */ | |
25 | #ifdef HAVE_TTRACE | |
26 | ||
27 | #include "command.h" | |
28 | #include "gdbcore.h" | |
a7be7fa8 | 29 | #include "gdbthread.h" |
eee22bf8 | 30 | #include "inferior.h" |
191c4426 | 31 | #include "terminal.h" |
eee22bf8 MK |
32 | #include "target.h" |
33 | ||
34 | #include "gdb_assert.h" | |
35 | #include "gdb_string.h" | |
932936f0 | 36 | #include <sys/mman.h> |
eee22bf8 | 37 | #include <sys/ttrace.h> |
438ac09b | 38 | #include <signal.h> |
eee22bf8 MK |
39 | |
40 | #include "inf-child.h" | |
41 | #include "inf-ttrace.h" | |
42 | ||
932936f0 MK |
43 | \f |
44 | ||
a7be7fa8 MK |
45 | /* HP-UX uses a threading model where each user-space thread |
46 | corresponds to a kernel thread. These kernel threads are called | |
47 | lwps. The ttrace(2) interface gives us almost full control over | |
48 | the threads, which makes it very easy to support them in GDB. We | |
49 | identify the threads by process ID and lwp ID. The ttrace(2) also | |
50 | provides us with a thread's user ID (in the `tts_user_tid' member | |
51 | of `ttstate_t') but we don't use that (yet) as it isn't necessary | |
52 | to uniquely label the thread. */ | |
53 | ||
54 | /* Number of active lwps. */ | |
55 | static int inf_ttrace_num_lwps; | |
56 | \f | |
57 | ||
932936f0 MK |
58 | /* On HP-UX versions that have the ttrace(2) system call, we can |
59 | implement "hardware" watchpoints by fiddling with the protection of | |
60 | pages in the address space that contain the variable being watched. | |
61 | In order to implement this, we keep a dictionary of pages for which | |
62 | we have changed the protection. */ | |
63 | ||
64 | struct inf_ttrace_page | |
65 | { | |
66 | CORE_ADDR addr; /* Page address. */ | |
67 | int prot; /* Protection. */ | |
68 | int refcount; /* Reference count. */ | |
69 | struct inf_ttrace_page *next; | |
70 | struct inf_ttrace_page *prev; | |
71 | }; | |
72 | ||
73 | struct inf_ttrace_page_dict | |
74 | { | |
75 | struct inf_ttrace_page buckets[128]; | |
76 | int pagesize; /* Page size. */ | |
77 | int count; /* Number of pages in this dictionary. */ | |
78 | } inf_ttrace_page_dict; | |
79 | ||
60e2c248 JG |
80 | struct inf_ttrace_private_thread_info |
81 | { | |
82 | int dying; | |
83 | }; | |
84 | ||
a7be7fa8 MK |
85 | /* Number of lwps that are currently in a system call. */ |
86 | static int inf_ttrace_num_lwps_in_syscall; | |
932936f0 MK |
87 | |
88 | /* Flag to indicate whether we should re-enable page protections after | |
89 | the next wait. */ | |
90 | static int inf_ttrace_reenable_page_protections; | |
91 | ||
92 | /* Enable system call events for process PID. */ | |
93 | ||
94 | static void | |
95 | inf_ttrace_enable_syscall_events (pid_t pid) | |
96 | { | |
97 | ttevent_t tte; | |
98 | ttstate_t tts; | |
99 | ||
a7be7fa8 | 100 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); |
932936f0 MK |
101 | |
102 | if (ttrace (TT_PROC_GET_EVENT_MASK, pid, 0, | |
103 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 104 | perror_with_name (("ttrace")); |
932936f0 MK |
105 | |
106 | tte.tte_events |= (TTEVT_SYSCALL_ENTRY | TTEVT_SYSCALL_RETURN); | |
107 | ||
108 | if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, | |
109 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 110 | perror_with_name (("ttrace")); |
932936f0 MK |
111 | |
112 | if (ttrace (TT_PROC_GET_FIRST_LWP_STATE, pid, 0, | |
113 | (uintptr_t)&tts, sizeof tts, 0) == -1) | |
e2e0b3e5 | 114 | perror_with_name (("ttrace")); |
932936f0 MK |
115 | |
116 | if (tts.tts_flags & TTS_INSYSCALL) | |
a7be7fa8 | 117 | inf_ttrace_num_lwps_in_syscall++; |
932936f0 MK |
118 | |
119 | /* FIXME: Handle multiple threads. */ | |
120 | } | |
121 | ||
122 | /* Disable system call events for process PID. */ | |
123 | ||
124 | static void | |
125 | inf_ttrace_disable_syscall_events (pid_t pid) | |
126 | { | |
127 | ttevent_t tte; | |
128 | ||
129 | gdb_assert (inf_ttrace_page_dict.count == 0); | |
130 | ||
131 | if (ttrace (TT_PROC_GET_EVENT_MASK, pid, 0, | |
132 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 133 | perror_with_name (("ttrace")); |
932936f0 MK |
134 | |
135 | tte.tte_events &= ~(TTEVT_SYSCALL_ENTRY | TTEVT_SYSCALL_RETURN); | |
136 | ||
137 | if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, | |
138 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 139 | perror_with_name (("ttrace")); |
932936f0 | 140 | |
a7be7fa8 | 141 | inf_ttrace_num_lwps_in_syscall = 0; |
932936f0 MK |
142 | } |
143 | ||
144 | /* Get information about the page at address ADDR for process PID from | |
145 | the dictionary. */ | |
146 | ||
147 | static struct inf_ttrace_page * | |
148 | inf_ttrace_get_page (pid_t pid, CORE_ADDR addr) | |
149 | { | |
150 | const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets); | |
151 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
152 | int bucket; | |
153 | struct inf_ttrace_page *page; | |
154 | ||
155 | bucket = (addr / pagesize) % num_buckets; | |
156 | page = &inf_ttrace_page_dict.buckets[bucket]; | |
157 | while (page) | |
158 | { | |
159 | if (page->addr == addr) | |
160 | break; | |
161 | ||
162 | page = page->next; | |
163 | } | |
164 | ||
165 | return page; | |
166 | } | |
167 | ||
168 | /* Add the page at address ADDR for process PID to the dictionary. */ | |
169 | ||
170 | static struct inf_ttrace_page * | |
171 | inf_ttrace_add_page (pid_t pid, CORE_ADDR addr) | |
172 | { | |
173 | const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets); | |
174 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
175 | int bucket; | |
176 | struct inf_ttrace_page *page; | |
177 | struct inf_ttrace_page *prev = NULL; | |
178 | ||
179 | bucket = (addr / pagesize) % num_buckets; | |
180 | page = &inf_ttrace_page_dict.buckets[bucket]; | |
181 | while (page) | |
182 | { | |
183 | if (page->addr == addr) | |
184 | break; | |
185 | ||
186 | prev = page; | |
187 | page = page->next; | |
188 | } | |
189 | ||
190 | if (!page) | |
191 | { | |
192 | int prot; | |
193 | ||
194 | if (ttrace (TT_PROC_GET_MPROTECT, pid, 0, | |
195 | addr, 0, (uintptr_t)&prot) == -1) | |
e2e0b3e5 | 196 | perror_with_name (("ttrace")); |
932936f0 MK |
197 | |
198 | page = XMALLOC (struct inf_ttrace_page); | |
199 | page->addr = addr; | |
200 | page->prot = prot; | |
201 | page->refcount = 0; | |
202 | page->next = NULL; | |
203 | ||
204 | page->prev = prev; | |
205 | prev->next = page; | |
206 | ||
207 | inf_ttrace_page_dict.count++; | |
208 | if (inf_ttrace_page_dict.count == 1) | |
209 | inf_ttrace_enable_syscall_events (pid); | |
210 | ||
a7be7fa8 | 211 | if (inf_ttrace_num_lwps_in_syscall == 0) |
932936f0 MK |
212 | { |
213 | if (ttrace (TT_PROC_SET_MPROTECT, pid, 0, | |
214 | addr, pagesize, prot & ~PROT_WRITE) == -1) | |
e2e0b3e5 | 215 | perror_with_name (("ttrace")); |
932936f0 MK |
216 | } |
217 | } | |
218 | ||
219 | return page; | |
220 | } | |
221 | ||
222 | /* Insert the page at address ADDR of process PID to the dictionary. */ | |
223 | ||
224 | static void | |
225 | inf_ttrace_insert_page (pid_t pid, CORE_ADDR addr) | |
226 | { | |
227 | struct inf_ttrace_page *page; | |
228 | ||
229 | page = inf_ttrace_get_page (pid, addr); | |
230 | if (!page) | |
231 | page = inf_ttrace_add_page (pid, addr); | |
232 | ||
233 | page->refcount++; | |
234 | } | |
235 | ||
236 | /* Remove the page at address ADDR of process PID from the dictionary. */ | |
237 | ||
238 | static void | |
239 | inf_ttrace_remove_page (pid_t pid, CORE_ADDR addr) | |
240 | { | |
241 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
242 | struct inf_ttrace_page *page; | |
243 | ||
244 | page = inf_ttrace_get_page (pid, addr); | |
245 | page->refcount--; | |
246 | ||
247 | gdb_assert (page->refcount >= 0); | |
248 | ||
249 | if (page->refcount == 0) | |
250 | { | |
a7be7fa8 | 251 | if (inf_ttrace_num_lwps_in_syscall == 0) |
932936f0 MK |
252 | { |
253 | if (ttrace (TT_PROC_SET_MPROTECT, pid, 0, | |
254 | addr, pagesize, page->prot) == -1) | |
e2e0b3e5 | 255 | perror_with_name (("ttrace")); |
932936f0 MK |
256 | } |
257 | ||
258 | inf_ttrace_page_dict.count--; | |
259 | if (inf_ttrace_page_dict.count == 0) | |
260 | inf_ttrace_disable_syscall_events (pid); | |
261 | ||
262 | page->prev->next = page->next; | |
263 | if (page->next) | |
264 | page->next->prev = page->prev; | |
265 | ||
266 | xfree (page); | |
267 | } | |
268 | } | |
269 | ||
270 | /* Mask the bits in PROT from the page protections that are currently | |
271 | in the dictionary for process PID. */ | |
272 | ||
273 | static void | |
274 | inf_ttrace_mask_page_protections (pid_t pid, int prot) | |
275 | { | |
276 | const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets); | |
277 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
278 | int bucket; | |
279 | ||
280 | for (bucket = 0; bucket < num_buckets; bucket++) | |
281 | { | |
282 | struct inf_ttrace_page *page; | |
283 | ||
284 | page = inf_ttrace_page_dict.buckets[bucket].next; | |
285 | while (page) | |
286 | { | |
287 | if (ttrace (TT_PROC_SET_MPROTECT, pid, 0, | |
288 | page->addr, pagesize, page->prot & ~prot) == -1) | |
e2e0b3e5 | 289 | perror_with_name (("ttrace")); |
932936f0 MK |
290 | |
291 | page = page->next; | |
292 | } | |
293 | } | |
294 | } | |
295 | ||
296 | /* Write-protect the pages in the dictionary for process PID. */ | |
297 | ||
298 | static void | |
299 | inf_ttrace_enable_page_protections (pid_t pid) | |
300 | { | |
301 | inf_ttrace_mask_page_protections (pid, PROT_WRITE); | |
302 | } | |
303 | ||
304 | /* Restore the protection of the pages in the dictionary for process | |
305 | PID. */ | |
306 | ||
307 | static void | |
308 | inf_ttrace_disable_page_protections (pid_t pid) | |
309 | { | |
310 | inf_ttrace_mask_page_protections (pid, 0); | |
311 | } | |
312 | ||
313 | /* Insert a "hardware" watchpoint for LEN bytes at address ADDR of | |
314 | type TYPE. */ | |
315 | ||
316 | static int | |
317 | inf_ttrace_insert_watchpoint (CORE_ADDR addr, int len, int type) | |
318 | { | |
319 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
320 | pid_t pid = ptid_get_pid (inferior_ptid); | |
321 | CORE_ADDR page_addr; | |
322 | int num_pages; | |
323 | int page; | |
324 | ||
325 | gdb_assert (type == hw_write); | |
326 | ||
327 | page_addr = (addr / pagesize) * pagesize; | |
328 | num_pages = (len + pagesize - 1) / pagesize; | |
329 | ||
330 | for (page = 0; page < num_pages; page++, page_addr += pagesize) | |
331 | inf_ttrace_insert_page (pid, page_addr); | |
332 | ||
333 | return 1; | |
334 | } | |
335 | ||
336 | /* Remove a "hardware" watchpoint for LEN bytes at address ADDR of | |
337 | type TYPE. */ | |
338 | ||
339 | static int | |
340 | inf_ttrace_remove_watchpoint (CORE_ADDR addr, int len, int type) | |
341 | { | |
342 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
343 | pid_t pid = ptid_get_pid (inferior_ptid); | |
344 | CORE_ADDR page_addr; | |
345 | int num_pages; | |
346 | int page; | |
347 | ||
348 | gdb_assert (type == hw_write); | |
349 | ||
350 | page_addr = (addr / pagesize) * pagesize; | |
351 | num_pages = (len + pagesize - 1) / pagesize; | |
352 | ||
353 | for (page = 0; page < num_pages; page++, page_addr += pagesize) | |
354 | inf_ttrace_remove_page (pid, page_addr); | |
355 | ||
356 | return 1; | |
357 | } | |
358 | ||
359 | static int | |
360 | inf_ttrace_can_use_hw_breakpoint (int type, int len, int ot) | |
361 | { | |
362 | return (type == bp_hardware_watchpoint); | |
363 | } | |
364 | ||
365 | static int | |
2a3cdf79 | 366 | inf_ttrace_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len) |
932936f0 MK |
367 | { |
368 | return 1; | |
369 | } | |
370 | ||
371 | /* Return non-zero if the current inferior was (potentially) stopped | |
372 | by hitting a "hardware" watchpoint. */ | |
373 | ||
374 | static int | |
375 | inf_ttrace_stopped_by_watchpoint (void) | |
376 | { | |
377 | pid_t pid = ptid_get_pid (inferior_ptid); | |
378 | lwpid_t lwpid = ptid_get_lwp (inferior_ptid); | |
379 | ttstate_t tts; | |
380 | ||
381 | if (inf_ttrace_page_dict.count > 0) | |
382 | { | |
383 | if (ttrace (TT_LWP_GET_STATE, pid, lwpid, | |
384 | (uintptr_t)&tts, sizeof tts, 0) == -1) | |
e2e0b3e5 | 385 | perror_with_name (("ttrace")); |
932936f0 MK |
386 | |
387 | if (tts.tts_event == TTEVT_SIGNAL | |
388 | && tts.tts_u.tts_signal.tts_signo == SIGBUS) | |
389 | { | |
390 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
391 | void *addr = tts.tts_u.tts_signal.tts_siginfo.si_addr; | |
392 | CORE_ADDR page_addr = ((uintptr_t)addr / pagesize) * pagesize; | |
393 | ||
394 | if (inf_ttrace_get_page (pid, page_addr)) | |
395 | return 1; | |
396 | } | |
397 | } | |
398 | ||
399 | return 0; | |
400 | } | |
401 | \f | |
eee22bf8 | 402 | |
b2a4db28 MK |
403 | /* When tracking a vfork(2), we cannot detach from the parent until |
404 | after the child has called exec(3) or has exited. If we are still | |
405 | attached to the parent, this variable will be set to the process ID | |
406 | of the parent. Otherwise it will be set to zero. */ | |
407 | static pid_t inf_ttrace_vfork_ppid = -1; | |
408 | ||
409 | static int | |
ee057212 | 410 | inf_ttrace_follow_fork (struct target_ops *ops, int follow_child) |
b2a4db28 MK |
411 | { |
412 | pid_t pid, fpid; | |
413 | lwpid_t lwpid, flwpid; | |
414 | ttstate_t tts; | |
4e1c45ea | 415 | struct thread_info *last_tp = NULL; |
b861ac81 PA |
416 | struct breakpoint *step_resume_breakpoint = NULL; |
417 | CORE_ADDR step_range_start = 0, step_range_end = 0; | |
418 | struct frame_id step_frame_id = null_frame_id; | |
b2a4db28 MK |
419 | |
420 | /* FIXME: kettenis/20050720: This stuff should really be passed as | |
421 | an argument by our caller. */ | |
422 | { | |
423 | ptid_t ptid; | |
424 | struct target_waitstatus status; | |
425 | ||
426 | get_last_target_status (&ptid, &status); | |
427 | gdb_assert (status.kind == TARGET_WAITKIND_FORKED | |
428 | || status.kind == TARGET_WAITKIND_VFORKED); | |
429 | ||
430 | pid = ptid_get_pid (ptid); | |
431 | lwpid = ptid_get_lwp (ptid); | |
4e1c45ea | 432 | last_tp = find_thread_pid (ptid); |
b2a4db28 MK |
433 | } |
434 | ||
435 | /* Get all important details that core GDB doesn't (and shouldn't) | |
436 | know about. */ | |
437 | if (ttrace (TT_LWP_GET_STATE, pid, lwpid, | |
438 | (uintptr_t)&tts, sizeof tts, 0) == -1) | |
439 | perror_with_name (("ttrace")); | |
440 | ||
441 | gdb_assert (tts.tts_event == TTEVT_FORK || tts.tts_event == TTEVT_VFORK); | |
442 | ||
443 | if (tts.tts_u.tts_fork.tts_isparent) | |
444 | { | |
445 | pid = tts.tts_pid; | |
446 | lwpid = tts.tts_lwpid; | |
447 | fpid = tts.tts_u.tts_fork.tts_fpid; | |
448 | flwpid = tts.tts_u.tts_fork.tts_flwpid; | |
449 | } | |
450 | else | |
451 | { | |
452 | pid = tts.tts_u.tts_fork.tts_fpid; | |
453 | lwpid = tts.tts_u.tts_fork.tts_flwpid; | |
454 | fpid = tts.tts_pid; | |
455 | flwpid = tts.tts_lwpid; | |
456 | } | |
457 | ||
458 | if (follow_child) | |
459 | { | |
77435e4c | 460 | struct inferior *inf; |
191c4426 PA |
461 | struct inferior *parent_inf; |
462 | ||
463 | parent_inf = find_inferior_pid (pid); | |
77435e4c | 464 | |
4e1c45ea | 465 | /* Copy user stepping state to the new inferior thread. */ |
b861ac81 PA |
466 | step_resume_breakpoint = last_tp->step_resume_breakpoint; |
467 | step_range_start = last_tp->step_range_start; | |
468 | step_range_end = last_tp->step_range_end; | |
469 | step_frame_id = last_tp->step_frame_id; | |
4e1c45ea PA |
470 | |
471 | /* Otherwise, deleting the parent would get rid of this | |
472 | breakpoint. */ | |
473 | last_tp->step_resume_breakpoint = NULL; | |
474 | ||
b2a4db28 | 475 | inferior_ptid = ptid_build (fpid, flwpid, 0); |
77435e4c | 476 | inf = add_inferior (fpid); |
191c4426 PA |
477 | inf->attach_flag = parent_inf->attach_flag; |
478 | copy_terminal_info (inf, parent_inf); | |
b2a4db28 MK |
479 | detach_breakpoints (pid); |
480 | ||
481 | target_terminal_ours (); | |
482 | fprintf_unfiltered (gdb_stdlog, _("\ | |
483 | Attaching after fork to child process %ld.\n"), (long)fpid); | |
484 | } | |
485 | else | |
486 | { | |
487 | inferior_ptid = ptid_build (pid, lwpid, 0); | |
488 | detach_breakpoints (fpid); | |
489 | ||
490 | target_terminal_ours (); | |
491 | fprintf_unfiltered (gdb_stdlog, _("\ | |
492 | Detaching after fork from child process %ld.\n"), (long)fpid); | |
493 | } | |
494 | ||
495 | if (tts.tts_event == TTEVT_VFORK) | |
496 | { | |
497 | gdb_assert (!tts.tts_u.tts_fork.tts_isparent); | |
498 | ||
499 | if (follow_child) | |
500 | { | |
501 | /* We can't detach from the parent yet. */ | |
502 | inf_ttrace_vfork_ppid = pid; | |
503 | ||
504 | reattach_breakpoints (fpid); | |
505 | } | |
506 | else | |
507 | { | |
508 | if (ttrace (TT_PROC_DETACH, fpid, 0, 0, 0, 0) == -1) | |
509 | perror_with_name (("ttrace")); | |
510 | ||
511 | /* Wait till we get the TTEVT_VFORK event in the parent. | |
512 | This indicates that the child has called exec(3) or has | |
513 | exited and that the parent is ready to be traced again. */ | |
514 | if (ttrace_wait (pid, lwpid, TTRACE_WAITOK, &tts, sizeof tts) == -1) | |
515 | perror_with_name (("ttrace_wait")); | |
516 | gdb_assert (tts.tts_event == TTEVT_VFORK); | |
517 | gdb_assert (tts.tts_u.tts_fork.tts_isparent); | |
518 | ||
519 | reattach_breakpoints (pid); | |
520 | } | |
521 | } | |
522 | else | |
523 | { | |
524 | gdb_assert (tts.tts_u.tts_fork.tts_isparent); | |
525 | ||
526 | if (follow_child) | |
527 | { | |
528 | if (ttrace (TT_PROC_DETACH, pid, 0, 0, 0, 0) == -1) | |
529 | perror_with_name (("ttrace")); | |
530 | } | |
531 | else | |
532 | { | |
533 | if (ttrace (TT_PROC_DETACH, fpid, 0, 0, 0, 0) == -1) | |
534 | perror_with_name (("ttrace")); | |
535 | } | |
536 | } | |
537 | ||
538 | if (follow_child) | |
539 | { | |
2935f27f PA |
540 | struct thread_info *ti; |
541 | ||
b2a4db28 | 542 | /* The child will start out single-threaded. */ |
2935f27f | 543 | inf_ttrace_num_lwps = 1; |
b2a4db28 MK |
544 | inf_ttrace_num_lwps_in_syscall = 0; |
545 | ||
2935f27f PA |
546 | /* Delete parent. */ |
547 | delete_thread_silent (ptid_build (pid, lwpid, 0)); | |
7f9f62ba | 548 | detach_inferior (pid); |
2935f27f | 549 | |
7f9f62ba | 550 | /* Add child thread. inferior_ptid was already set above. */ |
2935f27f PA |
551 | ti = add_thread_silent (inferior_ptid); |
552 | ti->private = | |
553 | xmalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
554 | memset (ti->private, 0, | |
555 | sizeof (struct inf_ttrace_private_thread_info)); | |
556 | ||
4e1c45ea PA |
557 | ti->step_resume_breakpoint = step_resume_breakpoint; |
558 | ti->step_range_start = step_range_start; | |
559 | ti->step_range_end = step_range_end; | |
560 | ti->step_frame_id = step_frame_id; | |
561 | ||
b2a4db28 MK |
562 | /* Reset breakpoints in the child as appropriate. */ |
563 | follow_inferior_reset_breakpoints (); | |
564 | } | |
565 | ||
566 | return 0; | |
567 | } | |
568 | \f | |
569 | ||
eee22bf8 MK |
570 | /* File descriptors for pipes used as semaphores during initial |
571 | startup of an inferior. */ | |
572 | static int inf_ttrace_pfd1[2]; | |
573 | static int inf_ttrace_pfd2[2]; | |
574 | ||
575 | static void | |
576 | do_cleanup_pfds (void *dummy) | |
577 | { | |
578 | close (inf_ttrace_pfd1[0]); | |
579 | close (inf_ttrace_pfd1[1]); | |
580 | close (inf_ttrace_pfd2[0]); | |
581 | close (inf_ttrace_pfd2[1]); | |
582 | } | |
583 | ||
584 | static void | |
585 | inf_ttrace_prepare (void) | |
586 | { | |
587 | if (pipe (inf_ttrace_pfd1) == -1) | |
a3f17187 | 588 | perror_with_name (("pipe")); |
eee22bf8 MK |
589 | |
590 | if (pipe (inf_ttrace_pfd2) == -1) | |
591 | { | |
592 | close (inf_ttrace_pfd1[0]); | |
593 | close (inf_ttrace_pfd2[0]); | |
a3f17187 | 594 | perror_with_name (("pipe")); |
eee22bf8 MK |
595 | } |
596 | } | |
597 | ||
598 | /* Prepare to be traced. */ | |
599 | ||
600 | static void | |
601 | inf_ttrace_me (void) | |
602 | { | |
603 | struct cleanup *old_chain = make_cleanup (do_cleanup_pfds, 0); | |
604 | char c; | |
605 | ||
606 | /* "Trace me, Dr. Memory!" */ | |
607 | if (ttrace (TT_PROC_SETTRC, 0, 0, 0, TT_VERSION, 0) == -1) | |
e2e0b3e5 | 608 | perror_with_name (("ttrace")); |
eee22bf8 MK |
609 | |
610 | /* Tell our parent that we are ready to be traced. */ | |
611 | if (write (inf_ttrace_pfd1[1], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 612 | perror_with_name (("write")); |
eee22bf8 MK |
613 | |
614 | /* Wait until our parent has set the initial event mask. */ | |
615 | if (read (inf_ttrace_pfd2[0], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 616 | perror_with_name (("read")); |
eee22bf8 MK |
617 | |
618 | do_cleanups (old_chain); | |
619 | } | |
620 | ||
621 | /* Start tracing PID. */ | |
622 | ||
623 | static void | |
28439f5e | 624 | inf_ttrace_him (struct target_ops *ops, int pid) |
eee22bf8 MK |
625 | { |
626 | struct cleanup *old_chain = make_cleanup (do_cleanup_pfds, 0); | |
627 | ttevent_t tte; | |
eee22bf8 MK |
628 | char c; |
629 | ||
630 | /* Wait until our child is ready to be traced. */ | |
631 | if (read (inf_ttrace_pfd1[0], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 632 | perror_with_name (("read")); |
eee22bf8 MK |
633 | |
634 | /* Set the initial event mask. */ | |
635 | memset (&tte, 0, sizeof (tte)); | |
b2a4db28 | 636 | tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT | TTEVT_FORK | TTEVT_VFORK; |
a7be7fa8 | 637 | tte.tte_events |= TTEVT_LWP_CREATE | TTEVT_LWP_EXIT | TTEVT_LWP_TERMINATE; |
7ba0e0c2 MK |
638 | #ifdef TTEVT_BPT_SSTEP |
639 | tte.tte_events |= TTEVT_BPT_SSTEP; | |
640 | #endif | |
b2a4db28 | 641 | tte.tte_opts |= TTEO_PROC_INHERIT; |
eee22bf8 MK |
642 | if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, |
643 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 644 | perror_with_name (("ttrace")); |
eee22bf8 MK |
645 | |
646 | /* Tell our child that we have set the initial event mask. */ | |
647 | if (write (inf_ttrace_pfd2[1], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 648 | perror_with_name (("write")); |
eee22bf8 MK |
649 | |
650 | do_cleanups (old_chain); | |
651 | ||
28439f5e | 652 | push_target (ops); |
eee22bf8 MK |
653 | |
654 | /* On some targets, there must be some explicit synchronization | |
655 | between the parent and child processes after the debugger forks, | |
656 | and before the child execs the debuggee program. This call | |
657 | basically gives permission for the child to exec. */ | |
658 | ||
659 | target_acknowledge_created_inferior (pid); | |
660 | ||
661 | /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h, and will | |
662 | be 1 or 2 depending on whether we're starting without or with a | |
663 | shell. */ | |
664 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); | |
665 | ||
666 | /* On some targets, there must be some explicit actions taken after | |
667 | the inferior has been started up. */ | |
668 | target_post_startup_inferior (pid_to_ptid (pid)); | |
669 | } | |
670 | ||
671 | static void | |
136d6dae VP |
672 | inf_ttrace_create_inferior (struct target_ops *ops, char *exec_file, |
673 | char *allargs, char **env, int from_tty) | |
eee22bf8 | 674 | { |
28439f5e PA |
675 | int pid; |
676 | ||
a7be7fa8 MK |
677 | gdb_assert (inf_ttrace_num_lwps == 0); |
678 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); | |
932936f0 | 679 | gdb_assert (inf_ttrace_page_dict.count == 0); |
932936f0 | 680 | gdb_assert (inf_ttrace_reenable_page_protections == 0); |
b2a4db28 | 681 | gdb_assert (inf_ttrace_vfork_ppid == -1); |
932936f0 | 682 | |
28439f5e PA |
683 | pid = fork_inferior (exec_file, allargs, env, inf_ttrace_me, NULL, |
684 | inf_ttrace_prepare, NULL); | |
685 | ||
686 | inf_ttrace_him (ops, pid); | |
eee22bf8 MK |
687 | } |
688 | ||
eee22bf8 | 689 | static void |
136d6dae | 690 | inf_ttrace_mourn_inferior (struct target_ops *ops) |
eee22bf8 | 691 | { |
932936f0 MK |
692 | const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets); |
693 | int bucket; | |
694 | ||
a7be7fa8 MK |
695 | inf_ttrace_num_lwps = 0; |
696 | inf_ttrace_num_lwps_in_syscall = 0; | |
932936f0 MK |
697 | |
698 | for (bucket = 0; bucket < num_buckets; bucket++) | |
699 | { | |
700 | struct inf_ttrace_page *page; | |
701 | struct inf_ttrace_page *next; | |
702 | ||
703 | page = inf_ttrace_page_dict.buckets[bucket].next; | |
704 | while (page) | |
705 | { | |
706 | next = page->next; | |
707 | xfree (page); | |
708 | page = next; | |
709 | } | |
710 | } | |
711 | inf_ttrace_page_dict.count = 0; | |
712 | ||
28439f5e | 713 | unpush_target (ops); |
eee22bf8 MK |
714 | generic_mourn_inferior (); |
715 | } | |
716 | ||
717 | static void | |
136d6dae | 718 | inf_ttrace_attach (struct target_ops *ops, char *args, int from_tty) |
eee22bf8 MK |
719 | { |
720 | char *exec_file; | |
721 | pid_t pid; | |
722 | char *dummy; | |
932936f0 | 723 | ttevent_t tte; |
181e7f93 | 724 | struct inferior *inf; |
eee22bf8 MK |
725 | |
726 | if (!args) | |
a3f17187 | 727 | error_no_arg (_("process-id to attach")); |
eee22bf8 MK |
728 | |
729 | dummy = args; | |
730 | pid = strtol (args, &dummy, 0); | |
731 | if (pid == 0 && args == dummy) | |
8a3fe4f8 | 732 | error (_("Illegal process-id: %s."), args); |
eee22bf8 MK |
733 | |
734 | if (pid == getpid ()) /* Trying to masturbate? */ | |
8a3fe4f8 | 735 | error (_("I refuse to debug myself!")); |
eee22bf8 MK |
736 | |
737 | if (from_tty) | |
738 | { | |
346e281c | 739 | exec_file = get_exec_file (0); |
eee22bf8 MK |
740 | |
741 | if (exec_file) | |
a3f17187 | 742 | printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
eee22bf8 MK |
743 | target_pid_to_str (pid_to_ptid (pid))); |
744 | else | |
a3f17187 | 745 | printf_unfiltered (_("Attaching to %s\n"), |
eee22bf8 MK |
746 | target_pid_to_str (pid_to_ptid (pid))); |
747 | ||
748 | gdb_flush (gdb_stdout); | |
749 | } | |
750 | ||
a7be7fa8 MK |
751 | gdb_assert (inf_ttrace_num_lwps == 0); |
752 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); | |
b2a4db28 | 753 | gdb_assert (inf_ttrace_vfork_ppid == -1); |
a7be7fa8 | 754 | |
eee22bf8 | 755 | if (ttrace (TT_PROC_ATTACH, pid, 0, TT_KILL_ON_EXIT, TT_VERSION, 0) == -1) |
e2e0b3e5 | 756 | perror_with_name (("ttrace")); |
eee22bf8 | 757 | |
181e7f93 PA |
758 | inf = add_inferior (pid); |
759 | inf->attach_flag = 1; | |
7f9f62ba | 760 | |
932936f0 | 761 | /* Set the initial event mask. */ |
932936f0 | 762 | memset (&tte, 0, sizeof (tte)); |
b2a4db28 | 763 | tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT | TTEVT_FORK | TTEVT_VFORK; |
a7be7fa8 | 764 | tte.tte_events |= TTEVT_LWP_CREATE | TTEVT_LWP_EXIT | TTEVT_LWP_TERMINATE; |
7ba0e0c2 MK |
765 | #ifdef TTEVT_BPT_SSTEP |
766 | tte.tte_events |= TTEVT_BPT_SSTEP; | |
767 | #endif | |
b2a4db28 | 768 | tte.tte_opts |= TTEO_PROC_INHERIT; |
932936f0 MK |
769 | if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, |
770 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 771 | perror_with_name (("ttrace")); |
932936f0 | 772 | |
28439f5e | 773 | push_target (ops); |
2935f27f PA |
774 | |
775 | /* We'll bump inf_ttrace_num_lwps up and add the private data to the | |
776 | thread as soon as we get to inf_ttrace_wait. At this point, we | |
777 | don't have lwpid info yet. */ | |
778 | inferior_ptid = pid_to_ptid (pid); | |
779 | add_thread_silent (inferior_ptid); | |
eee22bf8 MK |
780 | } |
781 | ||
782 | static void | |
136d6dae | 783 | inf_ttrace_detach (struct target_ops *ops, char *args, int from_tty) |
eee22bf8 | 784 | { |
eee22bf8 | 785 | pid_t pid = ptid_get_pid (inferior_ptid); |
5d426ff1 | 786 | int sig = 0; |
eee22bf8 MK |
787 | |
788 | if (from_tty) | |
789 | { | |
790 | char *exec_file = get_exec_file (0); | |
791 | if (exec_file == 0) | |
792 | exec_file = ""; | |
a3f17187 | 793 | printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file, |
eee22bf8 MK |
794 | target_pid_to_str (pid_to_ptid (pid))); |
795 | gdb_flush (gdb_stdout); | |
796 | } | |
797 | if (args) | |
798 | sig = atoi (args); | |
799 | ||
800 | /* ??? The HP-UX 11.0 ttrace(2) manual page doesn't mention that we | |
801 | can pass a signal number here. Does this really work? */ | |
802 | if (ttrace (TT_PROC_DETACH, pid, 0, 0, sig, 0) == -1) | |
e2e0b3e5 | 803 | perror_with_name (("ttrace")); |
eee22bf8 | 804 | |
b2a4db28 MK |
805 | if (inf_ttrace_vfork_ppid != -1) |
806 | { | |
807 | if (ttrace (TT_PROC_DETACH, inf_ttrace_vfork_ppid, 0, 0, 0, 0) == -1) | |
808 | perror_with_name (("ttrace")); | |
809 | inf_ttrace_vfork_ppid = -1; | |
810 | } | |
811 | ||
a7be7fa8 MK |
812 | inf_ttrace_num_lwps = 0; |
813 | inf_ttrace_num_lwps_in_syscall = 0; | |
932936f0 | 814 | |
932936f0 | 815 | inferior_ptid = null_ptid; |
7f9f62ba PA |
816 | detach_inferior (pid); |
817 | ||
28439f5e | 818 | unpush_target (ops); |
eee22bf8 MK |
819 | } |
820 | ||
346e281c | 821 | static void |
7d85a9c0 | 822 | inf_ttrace_kill (struct target_ops *ops) |
346e281c MK |
823 | { |
824 | pid_t pid = ptid_get_pid (inferior_ptid); | |
825 | ||
826 | if (pid == 0) | |
827 | return; | |
828 | ||
829 | if (ttrace (TT_PROC_EXIT, pid, 0, 0, 0, 0) == -1) | |
830 | perror_with_name (("ttrace")); | |
831 | /* ??? Is it necessary to call ttrace_wait() here? */ | |
832 | ||
833 | if (inf_ttrace_vfork_ppid != -1) | |
834 | { | |
835 | if (ttrace (TT_PROC_DETACH, inf_ttrace_vfork_ppid, 0, 0, 0, 0) == -1) | |
836 | perror_with_name (("ttrace")); | |
837 | inf_ttrace_vfork_ppid = -1; | |
838 | } | |
839 | ||
840 | target_mourn_inferior (); | |
841 | } | |
842 | ||
438ac09b PA |
843 | /* Check is a dying thread is dead by now, and delete it from GDBs |
844 | thread list if so. */ | |
7ba0e0c2 | 845 | static int |
438ac09b | 846 | inf_ttrace_delete_dead_threads_callback (struct thread_info *info, void *arg) |
7ba0e0c2 | 847 | { |
438ac09b PA |
848 | lwpid_t lwpid; |
849 | struct inf_ttrace_private_thread_info *p; | |
7ba0e0c2 | 850 | |
438ac09b PA |
851 | if (is_exited (info->ptid)) |
852 | return 0; | |
853 | ||
854 | lwpid = ptid_get_lwp (info->ptid); | |
855 | p = (struct inf_ttrace_private_thread_info *) info->private; | |
856 | ||
857 | /* Check if an lwp that was dying is still there or not. */ | |
858 | if (p->dying && (kill (lwpid, 0) == -1)) | |
859 | /* It's gone now. */ | |
860 | delete_thread (info->ptid); | |
7ba0e0c2 MK |
861 | |
862 | return 0; | |
863 | } | |
864 | ||
438ac09b PA |
865 | /* Resume the lwp pointed to by INFO, with REQUEST, and pass it signal |
866 | SIG. */ | |
867 | ||
868 | static void | |
869 | inf_ttrace_resume_lwp (struct thread_info *info, ttreq_t request, int sig) | |
870 | { | |
871 | pid_t pid = ptid_get_pid (info->ptid); | |
872 | lwpid_t lwpid = ptid_get_lwp (info->ptid); | |
873 | ||
874 | if (ttrace (request, pid, lwpid, TT_NOPC, sig, 0) == -1) | |
875 | { | |
876 | struct inf_ttrace_private_thread_info *p | |
877 | = (struct inf_ttrace_private_thread_info *) info->private; | |
878 | if (p->dying && errno == EPROTO) | |
879 | /* This is expected, it means the dying lwp is really gone | |
880 | by now. If ttrace had an event to inform the debugger | |
881 | the lwp is really gone, this wouldn't be needed. */ | |
882 | delete_thread (info->ptid); | |
883 | else | |
884 | /* This was really unexpected. */ | |
885 | perror_with_name (("ttrace")); | |
886 | } | |
887 | } | |
888 | ||
889 | /* Callback for iterate_over_threads. */ | |
890 | ||
60e2c248 | 891 | static int |
438ac09b | 892 | inf_ttrace_resume_callback (struct thread_info *info, void *arg) |
60e2c248 | 893 | { |
438ac09b PA |
894 | if (!ptid_equal (info->ptid, inferior_ptid) && !is_exited (info->ptid)) |
895 | inf_ttrace_resume_lwp (info, TT_LWP_CONTINUE, 0); | |
896 | ||
60e2c248 JG |
897 | return 0; |
898 | } | |
899 | ||
eee22bf8 | 900 | static void |
28439f5e PA |
901 | inf_ttrace_resume (struct target_ops *ops, |
902 | ptid_t ptid, int step, enum target_signal signal) | |
eee22bf8 | 903 | { |
438ac09b | 904 | int resume_all; |
eee22bf8 MK |
905 | ttreq_t request = step ? TT_LWP_SINGLE : TT_LWP_CONTINUE; |
906 | int sig = target_signal_to_host (signal); | |
438ac09b | 907 | struct thread_info *info; |
eee22bf8 | 908 | |
438ac09b PA |
909 | /* A specific PTID means `step only this process id'. */ |
910 | resume_all = (ptid_equal (ptid, minus_one_ptid)); | |
eee22bf8 | 911 | |
438ac09b PA |
912 | /* If resuming all threads, it's the current thread that should be |
913 | handled specially. */ | |
914 | if (resume_all) | |
915 | ptid = inferior_ptid; | |
eee22bf8 | 916 | |
b861ac81 | 917 | info = find_thread_pid (ptid); |
438ac09b PA |
918 | inf_ttrace_resume_lwp (info, request, sig); |
919 | ||
920 | if (resume_all) | |
921 | /* Let all the other threads run too. */ | |
922 | iterate_over_threads (inf_ttrace_resume_callback, NULL); | |
eee22bf8 MK |
923 | } |
924 | ||
925 | static ptid_t | |
117de6a9 | 926 | inf_ttrace_wait (struct target_ops *ops, |
47608cb1 | 927 | ptid_t ptid, struct target_waitstatus *ourstatus, int options) |
eee22bf8 MK |
928 | { |
929 | pid_t pid = ptid_get_pid (ptid); | |
930 | lwpid_t lwpid = ptid_get_lwp (ptid); | |
931 | ttstate_t tts; | |
60e2c248 | 932 | struct thread_info *ti; |
3a3e9ee3 | 933 | ptid_t related_ptid; |
eee22bf8 | 934 | |
932936f0 | 935 | /* Until proven otherwise. */ |
a7be7fa8 | 936 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; |
eee22bf8 MK |
937 | |
938 | if (pid == -1) | |
b2a4db28 | 939 | pid = lwpid = 0; |
eee22bf8 | 940 | |
b2a4db28 | 941 | gdb_assert (pid != 0 || lwpid == 0); |
eee22bf8 MK |
942 | |
943 | do | |
944 | { | |
945 | set_sigint_trap (); | |
eee22bf8 MK |
946 | |
947 | if (ttrace_wait (pid, lwpid, TTRACE_WAITOK, &tts, sizeof tts) == -1) | |
a3f17187 | 948 | perror_with_name (("ttrace_wait")); |
eee22bf8 | 949 | |
b2a4db28 MK |
950 | if (tts.tts_event == TTEVT_VFORK && tts.tts_u.tts_fork.tts_isparent) |
951 | { | |
952 | if (inf_ttrace_vfork_ppid != -1) | |
953 | { | |
954 | gdb_assert (inf_ttrace_vfork_ppid == tts.tts_pid); | |
955 | ||
956 | if (ttrace (TT_PROC_DETACH, tts.tts_pid, 0, 0, 0, 0) == -1) | |
957 | perror_with_name (("ttrace")); | |
958 | inf_ttrace_vfork_ppid = -1; | |
959 | } | |
960 | ||
961 | tts.tts_event = TTEVT_NONE; | |
962 | } | |
963 | ||
eee22bf8 MK |
964 | clear_sigint_trap (); |
965 | } | |
966 | while (tts.tts_event == TTEVT_NONE); | |
967 | ||
932936f0 MK |
968 | /* Now that we've waited, we can re-enable the page protections. */ |
969 | if (inf_ttrace_reenable_page_protections) | |
970 | { | |
a7be7fa8 | 971 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); |
932936f0 MK |
972 | inf_ttrace_enable_page_protections (tts.tts_pid); |
973 | inf_ttrace_reenable_page_protections = 0; | |
974 | } | |
975 | ||
a7be7fa8 MK |
976 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); |
977 | ||
2935f27f PA |
978 | if (inf_ttrace_num_lwps == 0) |
979 | { | |
980 | struct thread_info *ti; | |
981 | ||
982 | inf_ttrace_num_lwps = 1; | |
983 | ||
984 | /* This is the earliest we hear about the lwp member of | |
985 | INFERIOR_PTID, after an attach or fork_inferior. */ | |
986 | gdb_assert (ptid_get_lwp (inferior_ptid) == 0); | |
987 | ||
988 | /* We haven't set the private member on the main thread yet. Do | |
989 | it now. */ | |
990 | ti = find_thread_pid (inferior_ptid); | |
991 | gdb_assert (ti != NULL && ti->private == NULL); | |
992 | ti->private = | |
993 | xmalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
994 | memset (ti->private, 0, | |
995 | sizeof (struct inf_ttrace_private_thread_info)); | |
996 | ||
997 | /* Notify the core that this ptid changed. This changes | |
998 | inferior_ptid as well. */ | |
999 | thread_change_ptid (inferior_ptid, ptid); | |
1000 | } | |
1001 | ||
eee22bf8 MK |
1002 | switch (tts.tts_event) |
1003 | { | |
7ba0e0c2 MK |
1004 | #ifdef TTEVT_BPT_SSTEP |
1005 | case TTEVT_BPT_SSTEP: | |
1006 | /* Make it look like a breakpoint. */ | |
1007 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
1008 | ourstatus->value.sig = TARGET_SIGNAL_TRAP; | |
1009 | break; | |
1010 | #endif | |
1011 | ||
eee22bf8 | 1012 | case TTEVT_EXEC: |
5d426ff1 MK |
1013 | ourstatus->kind = TARGET_WAITKIND_EXECD; |
1014 | ourstatus->value.execd_pathname = | |
1015 | xmalloc (tts.tts_u.tts_exec.tts_pathlen + 1); | |
1016 | if (ttrace (TT_PROC_GET_PATHNAME, tts.tts_pid, 0, | |
1017 | (uintptr_t)ourstatus->value.execd_pathname, | |
1018 | tts.tts_u.tts_exec.tts_pathlen, 0) == -1) | |
1019 | perror_with_name (("ttrace")); | |
1020 | ourstatus->value.execd_pathname[tts.tts_u.tts_exec.tts_pathlen] = 0; | |
25b22b0a PA |
1021 | |
1022 | /* At this point, all inserted breakpoints are gone. Doing this | |
1023 | as soon as we detect an exec prevents the badness of deleting | |
1024 | a breakpoint writing the current "shadow contents" to lift | |
1025 | the bp. That shadow is NOT valid after an exec. */ | |
1026 | mark_breakpoints_out (); | |
eee22bf8 | 1027 | break; |
932936f0 | 1028 | |
eee22bf8 MK |
1029 | case TTEVT_EXIT: |
1030 | store_waitstatus (ourstatus, tts.tts_u.tts_exit.tts_exitcode); | |
a7be7fa8 MK |
1031 | inf_ttrace_num_lwps = 0; |
1032 | break; | |
1033 | ||
b2a4db28 | 1034 | case TTEVT_FORK: |
3a3e9ee3 PA |
1035 | related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid, |
1036 | tts.tts_u.tts_fork.tts_flwpid, 0); | |
1037 | ||
b2a4db28 | 1038 | ourstatus->kind = TARGET_WAITKIND_FORKED; |
3a3e9ee3 | 1039 | ourstatus->value.related_pid = related_ptid; |
b2a4db28 MK |
1040 | |
1041 | /* Make sure the other end of the fork is stopped too. */ | |
1042 | if (ttrace_wait (tts.tts_u.tts_fork.tts_fpid, | |
1043 | tts.tts_u.tts_fork.tts_flwpid, | |
1044 | TTRACE_WAITOK, &tts, sizeof tts) == -1) | |
1045 | perror_with_name (("ttrace_wait")); | |
1046 | ||
1047 | gdb_assert (tts.tts_event == TTEVT_FORK); | |
1048 | if (tts.tts_u.tts_fork.tts_isparent) | |
1049 | { | |
3a3e9ee3 PA |
1050 | related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid, |
1051 | tts.tts_u.tts_fork.tts_flwpid, 0); | |
b2a4db28 | 1052 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); |
3a3e9ee3 | 1053 | ourstatus->value.related_pid = related_ptid; |
b2a4db28 MK |
1054 | } |
1055 | break; | |
1056 | ||
1057 | case TTEVT_VFORK: | |
1058 | gdb_assert (!tts.tts_u.tts_fork.tts_isparent); | |
1059 | ||
3a3e9ee3 PA |
1060 | related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid, |
1061 | tts.tts_u.tts_fork.tts_flwpid, 0); | |
1062 | ||
b2a4db28 | 1063 | ourstatus->kind = TARGET_WAITKIND_VFORKED; |
3a3e9ee3 | 1064 | ourstatus->value.related_pid = related_ptid; |
b2a4db28 MK |
1065 | |
1066 | /* HACK: To avoid touching the parent during the vfork, switch | |
1067 | away from it. */ | |
1068 | inferior_ptid = ptid; | |
1069 | break; | |
1070 | ||
a7be7fa8 MK |
1071 | case TTEVT_LWP_CREATE: |
1072 | lwpid = tts.tts_u.tts_thread.tts_target_lwpid; | |
1073 | ptid = ptid_build (tts.tts_pid, lwpid, 0); | |
60e2c248 JG |
1074 | ti = add_thread (ptid); |
1075 | ti->private = | |
1076 | xmalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
1077 | memset (ti->private, 0, | |
1078 | sizeof (struct inf_ttrace_private_thread_info)); | |
a7be7fa8 MK |
1079 | inf_ttrace_num_lwps++; |
1080 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); | |
62a93fa9 PA |
1081 | /* Let the lwp_create-caller thread continue. */ |
1082 | ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid), | |
1083 | ptid_get_lwp (ptid), TT_NOPC, 0, 0); | |
1084 | /* Return without stopping the whole process. */ | |
1085 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
1086 | return ptid; | |
a7be7fa8 MK |
1087 | |
1088 | case TTEVT_LWP_EXIT: | |
17faa917 DJ |
1089 | if (print_thread_events) |
1090 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (ptid)); | |
60e2c248 JG |
1091 | ti = find_thread_pid (ptid); |
1092 | gdb_assert (ti != NULL); | |
1093 | ((struct inf_ttrace_private_thread_info *)ti->private)->dying = 1; | |
a7be7fa8 | 1094 | inf_ttrace_num_lwps--; |
62a93fa9 | 1095 | /* Let the thread really exit. */ |
60e2c248 JG |
1096 | ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid), |
1097 | ptid_get_lwp (ptid), TT_NOPC, 0, 0); | |
62a93fa9 PA |
1098 | /* Return without stopping the whole process. */ |
1099 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
1100 | return ptid; | |
a7be7fa8 MK |
1101 | |
1102 | case TTEVT_LWP_TERMINATE: | |
1103 | lwpid = tts.tts_u.tts_thread.tts_target_lwpid; | |
1104 | ptid = ptid_build (tts.tts_pid, lwpid, 0); | |
62a93fa9 | 1105 | if (print_thread_events) |
b861ac81 | 1106 | printf_unfiltered(_("[%s has been terminated]\n"), |
62a93fa9 | 1107 | target_pid_to_str (ptid)); |
60e2c248 JG |
1108 | ti = find_thread_pid (ptid); |
1109 | gdb_assert (ti != NULL); | |
1110 | ((struct inf_ttrace_private_thread_info *)ti->private)->dying = 1; | |
a7be7fa8 | 1111 | inf_ttrace_num_lwps--; |
62a93fa9 PA |
1112 | |
1113 | /* Resume the lwp_terminate-caller thread. */ | |
a7be7fa8 | 1114 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); |
62a93fa9 PA |
1115 | ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid), |
1116 | ptid_get_lwp (ptid), TT_NOPC, 0, 0); | |
1117 | /* Return without stopping the whole process. */ | |
1118 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
1119 | return ptid; | |
932936f0 | 1120 | |
eee22bf8 MK |
1121 | case TTEVT_SIGNAL: |
1122 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
1123 | ourstatus->value.sig = | |
1124 | target_signal_from_host (tts.tts_u.tts_signal.tts_signo); | |
1125 | break; | |
932936f0 MK |
1126 | |
1127 | case TTEVT_SYSCALL_ENTRY: | |
1128 | gdb_assert (inf_ttrace_reenable_page_protections == 0); | |
a7be7fa8 MK |
1129 | inf_ttrace_num_lwps_in_syscall++; |
1130 | if (inf_ttrace_num_lwps_in_syscall == 1) | |
932936f0 MK |
1131 | { |
1132 | /* A thread has just entered a system call. Disable any | |
1133 | page protections as the kernel can't deal with them. */ | |
1134 | inf_ttrace_disable_page_protections (tts.tts_pid); | |
1135 | } | |
1136 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_ENTRY; | |
1137 | ourstatus->value.syscall_id = tts.tts_scno; | |
1138 | break; | |
1139 | ||
1140 | case TTEVT_SYSCALL_RETURN: | |
a7be7fa8 | 1141 | if (inf_ttrace_num_lwps_in_syscall > 0) |
932936f0 MK |
1142 | { |
1143 | /* If the last thread has just left the system call, this | |
1144 | would be a logical place to re-enable the page | |
1145 | protections, but that doesn't work. We can't re-enable | |
1146 | them until we've done another wait. */ | |
1147 | inf_ttrace_reenable_page_protections = | |
a7be7fa8 MK |
1148 | (inf_ttrace_num_lwps_in_syscall == 1); |
1149 | inf_ttrace_num_lwps_in_syscall--; | |
932936f0 MK |
1150 | } |
1151 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_RETURN; | |
1152 | ourstatus->value.syscall_id = tts.tts_scno; | |
1153 | break; | |
a7be7fa8 MK |
1154 | |
1155 | default: | |
1156 | gdb_assert (!"Unexpected ttrace event"); | |
1157 | break; | |
eee22bf8 MK |
1158 | } |
1159 | ||
1160 | /* Make sure all threads within the process are stopped. */ | |
1161 | if (ttrace (TT_PROC_STOP, tts.tts_pid, 0, 0, 0, 0) == -1) | |
e2e0b3e5 | 1162 | perror_with_name (("ttrace")); |
eee22bf8 | 1163 | |
438ac09b PA |
1164 | /* Now that the whole process is stopped, check if any dying thread |
1165 | is really dead by now. If a dying thread is still alive, it will | |
1166 | be stopped too, and will still show up in `info threads', tagged | |
1167 | with "(Exiting)". We could make `info threads' prune dead | |
1168 | threads instead via inf_ttrace_thread_alive, but doing this here | |
1169 | has the advantage that a frontend is notificed sooner of thread | |
1170 | exits. Note that a dying lwp is still alive, it still has to be | |
1171 | resumed, like any other lwp. */ | |
1172 | iterate_over_threads (inf_ttrace_delete_dead_threads_callback, NULL); | |
1173 | ||
a7be7fa8 | 1174 | return ptid; |
eee22bf8 MK |
1175 | } |
1176 | ||
1177 | /* Transfer LEN bytes from ADDR in the inferior's memory into READBUF, | |
1178 | and transfer LEN bytes from WRITEBUF into the inferior's memory at | |
1179 | ADDR. Either READBUF or WRITEBUF may be null, in which case the | |
1180 | corresponding transfer doesn't happen. Return the number of bytes | |
1181 | actually transferred (which may be zero if an error occurs). */ | |
1182 | ||
1183 | static LONGEST | |
1184 | inf_ttrace_xfer_memory (CORE_ADDR addr, ULONGEST len, | |
1185 | void *readbuf, const void *writebuf) | |
1186 | { | |
1187 | pid_t pid = ptid_get_pid (inferior_ptid); | |
1188 | ||
1189 | /* HP-UX treats text space and data space differently. GDB however, | |
1190 | doesn't really know the difference. Therefore we try both. Try | |
1191 | text space before data space though because when we're writing | |
1192 | into text space the instruction cache might need to be flushed. */ | |
1193 | ||
1194 | if (readbuf | |
1195 | && ttrace (TT_PROC_RDTEXT, pid, 0, addr, len, (uintptr_t)readbuf) == -1 | |
1196 | && ttrace (TT_PROC_RDDATA, pid, 0, addr, len, (uintptr_t)readbuf) == -1) | |
1197 | return 0; | |
1198 | ||
1199 | if (writebuf | |
1200 | && ttrace (TT_PROC_WRTEXT, pid, 0, addr, len, (uintptr_t)writebuf) == -1 | |
1201 | && ttrace (TT_PROC_WRDATA, pid, 0, addr, len, (uintptr_t)writebuf) == -1) | |
1202 | return 0; | |
1203 | ||
1204 | return len; | |
1205 | } | |
1206 | ||
1207 | static LONGEST | |
1208 | inf_ttrace_xfer_partial (struct target_ops *ops, enum target_object object, | |
7a4609f7 MK |
1209 | const char *annex, gdb_byte *readbuf, |
1210 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
eee22bf8 MK |
1211 | { |
1212 | switch (object) | |
1213 | { | |
1214 | case TARGET_OBJECT_MEMORY: | |
1215 | return inf_ttrace_xfer_memory (offset, len, readbuf, writebuf); | |
1216 | ||
1217 | case TARGET_OBJECT_UNWIND_TABLE: | |
1218 | return -1; | |
1219 | ||
1220 | case TARGET_OBJECT_AUXV: | |
1221 | return -1; | |
1222 | ||
1223 | case TARGET_OBJECT_WCOOKIE: | |
1224 | return -1; | |
1225 | ||
1226 | default: | |
1227 | return -1; | |
1228 | } | |
1229 | } | |
1230 | ||
1231 | /* Print status information about what we're accessing. */ | |
1232 | ||
1233 | static void | |
1234 | inf_ttrace_files_info (struct target_ops *ignore) | |
1235 | { | |
181e7f93 | 1236 | struct inferior *inf = current_inferior (); |
346e281c | 1237 | printf_filtered (_("\tUsing the running image of %s %s.\n"), |
181e7f93 | 1238 | inf->attach_flag ? "attached" : "child", |
346e281c | 1239 | target_pid_to_str (inferior_ptid)); |
eee22bf8 | 1240 | } |
a7be7fa8 MK |
1241 | |
1242 | static int | |
28439f5e | 1243 | inf_ttrace_thread_alive (struct target_ops *ops, ptid_t ptid) |
a7be7fa8 | 1244 | { |
438ac09b PA |
1245 | return 1; |
1246 | } | |
1247 | ||
1248 | /* Return a string describing the state of the thread specified by | |
1249 | INFO. */ | |
1250 | ||
1251 | static char * | |
1252 | inf_ttrace_extra_thread_info (struct thread_info *info) | |
1253 | { | |
1254 | struct inf_ttrace_private_thread_info* private = | |
1255 | (struct inf_ttrace_private_thread_info *) info->private; | |
1256 | ||
1257 | if (private != NULL && private->dying) | |
1258 | return "Exiting"; | |
1259 | ||
1260 | return NULL; | |
a7be7fa8 MK |
1261 | } |
1262 | ||
1263 | static char * | |
117de6a9 | 1264 | inf_ttrace_pid_to_str (struct target_ops *ops, ptid_t ptid) |
a7be7fa8 | 1265 | { |
2935f27f PA |
1266 | pid_t pid = ptid_get_pid (ptid); |
1267 | lwpid_t lwpid = ptid_get_lwp (ptid); | |
1268 | static char buf[128]; | |
a7be7fa8 | 1269 | |
2935f27f PA |
1270 | if (lwpid == 0) |
1271 | xsnprintf (buf, sizeof buf, "process %ld", | |
1272 | (long) pid); | |
1273 | else | |
1274 | xsnprintf (buf, sizeof buf, "process %ld, lwp %ld", | |
1275 | (long) pid, (long) lwpid); | |
1276 | return buf; | |
a7be7fa8 | 1277 | } |
eee22bf8 MK |
1278 | \f |
1279 | ||
1280 | struct target_ops * | |
1281 | inf_ttrace_target (void) | |
1282 | { | |
1283 | struct target_ops *t = inf_child_target (); | |
1284 | ||
eee22bf8 MK |
1285 | t->to_attach = inf_ttrace_attach; |
1286 | t->to_detach = inf_ttrace_detach; | |
1287 | t->to_resume = inf_ttrace_resume; | |
1288 | t->to_wait = inf_ttrace_wait; | |
eee22bf8 | 1289 | t->to_files_info = inf_ttrace_files_info; |
932936f0 | 1290 | t->to_can_use_hw_breakpoint = inf_ttrace_can_use_hw_breakpoint; |
932936f0 MK |
1291 | t->to_insert_watchpoint = inf_ttrace_insert_watchpoint; |
1292 | t->to_remove_watchpoint = inf_ttrace_remove_watchpoint; | |
1293 | t->to_stopped_by_watchpoint = inf_ttrace_stopped_by_watchpoint; | |
2a3cdf79 WZ |
1294 | t->to_region_ok_for_hw_watchpoint = |
1295 | inf_ttrace_region_ok_for_hw_watchpoint; | |
346e281c MK |
1296 | t->to_kill = inf_ttrace_kill; |
1297 | t->to_create_inferior = inf_ttrace_create_inferior; | |
1298 | t->to_follow_fork = inf_ttrace_follow_fork; | |
1299 | t->to_mourn_inferior = inf_ttrace_mourn_inferior; | |
1300 | t->to_thread_alive = inf_ttrace_thread_alive; | |
438ac09b | 1301 | t->to_extra_thread_info = inf_ttrace_extra_thread_info; |
346e281c MK |
1302 | t->to_pid_to_str = inf_ttrace_pid_to_str; |
1303 | t->to_xfer_partial = inf_ttrace_xfer_partial; | |
eee22bf8 | 1304 | |
eee22bf8 MK |
1305 | return t; |
1306 | } | |
d3322e8a | 1307 | #endif |
932936f0 MK |
1308 | \f |
1309 | ||
1310 | /* Prevent warning from -Wmissing-prototypes. */ | |
1311 | void _initialize_hppa_hpux_nat (void); | |
eee22bf8 | 1312 | |
932936f0 MK |
1313 | void |
1314 | _initialize_inf_ttrace (void) | |
1315 | { | |
d3322e8a | 1316 | #ifdef HAVE_TTRACE |
932936f0 | 1317 | inf_ttrace_page_dict.pagesize = getpagesize(); |
eee22bf8 | 1318 | #endif |
d3322e8a | 1319 | } |