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