Commit | Line | Data |
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eee22bf8 MK |
1 | /* Low-level child interface to ttrace. |
2 | ||
0b302171 | 3 | Copyright (C) 2004-2012 Free Software Foundation, Inc. |
eee22bf8 MK |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
eee22bf8 MK |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
eee22bf8 MK |
19 | |
20 | #include "defs.h" | |
21 | ||
22 | /* The ttrace(2) system call didn't exist before HP-UX 10.30. Don't | |
23 | try to compile this code unless we have it. */ | |
24 | #ifdef HAVE_TTRACE | |
25 | ||
26 | #include "command.h" | |
27 | #include "gdbcore.h" | |
a7be7fa8 | 28 | #include "gdbthread.h" |
eee22bf8 | 29 | #include "inferior.h" |
191c4426 | 30 | #include "terminal.h" |
eee22bf8 MK |
31 | #include "target.h" |
32 | ||
33 | #include "gdb_assert.h" | |
34 | #include "gdb_string.h" | |
932936f0 | 35 | #include <sys/mman.h> |
eee22bf8 | 36 | #include <sys/ttrace.h> |
438ac09b | 37 | #include <signal.h> |
eee22bf8 MK |
38 | |
39 | #include "inf-child.h" | |
40 | #include "inf-ttrace.h" | |
41 | ||
932936f0 MK |
42 | \f |
43 | ||
a7be7fa8 MK |
44 | /* HP-UX uses a threading model where each user-space thread |
45 | corresponds to a kernel thread. These kernel threads are called | |
46 | lwps. The ttrace(2) interface gives us almost full control over | |
47 | the threads, which makes it very easy to support them in GDB. We | |
48 | identify the threads by process ID and lwp ID. The ttrace(2) also | |
49 | provides us with a thread's user ID (in the `tts_user_tid' member | |
50 | of `ttstate_t') but we don't use that (yet) as it isn't necessary | |
51 | to uniquely label the thread. */ | |
52 | ||
53 | /* Number of active lwps. */ | |
54 | static int inf_ttrace_num_lwps; | |
55 | \f | |
56 | ||
932936f0 MK |
57 | /* On HP-UX versions that have the ttrace(2) system call, we can |
58 | implement "hardware" watchpoints by fiddling with the protection of | |
59 | pages in the address space that contain the variable being watched. | |
60 | In order to implement this, we keep a dictionary of pages for which | |
61 | we have changed the protection. */ | |
62 | ||
63 | struct inf_ttrace_page | |
64 | { | |
65 | CORE_ADDR addr; /* Page address. */ | |
66 | int prot; /* Protection. */ | |
67 | int refcount; /* Reference count. */ | |
68 | struct inf_ttrace_page *next; | |
69 | struct inf_ttrace_page *prev; | |
70 | }; | |
71 | ||
72 | struct inf_ttrace_page_dict | |
73 | { | |
74 | struct inf_ttrace_page buckets[128]; | |
75 | int pagesize; /* Page size. */ | |
76 | int count; /* Number of pages in this dictionary. */ | |
77 | } inf_ttrace_page_dict; | |
78 | ||
60e2c248 JG |
79 | struct inf_ttrace_private_thread_info |
80 | { | |
81 | int dying; | |
82 | }; | |
83 | ||
a7be7fa8 MK |
84 | /* Number of lwps that are currently in a system call. */ |
85 | static int inf_ttrace_num_lwps_in_syscall; | |
932936f0 MK |
86 | |
87 | /* Flag to indicate whether we should re-enable page protections after | |
88 | the next wait. */ | |
89 | static int inf_ttrace_reenable_page_protections; | |
90 | ||
91 | /* Enable system call events for process PID. */ | |
92 | ||
93 | static void | |
94 | inf_ttrace_enable_syscall_events (pid_t pid) | |
95 | { | |
96 | ttevent_t tte; | |
97 | ttstate_t tts; | |
98 | ||
a7be7fa8 | 99 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); |
932936f0 MK |
100 | |
101 | if (ttrace (TT_PROC_GET_EVENT_MASK, pid, 0, | |
102 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 103 | perror_with_name (("ttrace")); |
932936f0 MK |
104 | |
105 | tte.tte_events |= (TTEVT_SYSCALL_ENTRY | TTEVT_SYSCALL_RETURN); | |
106 | ||
107 | if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, | |
108 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 109 | perror_with_name (("ttrace")); |
932936f0 MK |
110 | |
111 | if (ttrace (TT_PROC_GET_FIRST_LWP_STATE, pid, 0, | |
112 | (uintptr_t)&tts, sizeof tts, 0) == -1) | |
e2e0b3e5 | 113 | perror_with_name (("ttrace")); |
932936f0 MK |
114 | |
115 | if (tts.tts_flags & TTS_INSYSCALL) | |
a7be7fa8 | 116 | inf_ttrace_num_lwps_in_syscall++; |
932936f0 MK |
117 | |
118 | /* FIXME: Handle multiple threads. */ | |
119 | } | |
120 | ||
121 | /* Disable system call events for process PID. */ | |
122 | ||
123 | static void | |
124 | inf_ttrace_disable_syscall_events (pid_t pid) | |
125 | { | |
126 | ttevent_t tte; | |
127 | ||
128 | gdb_assert (inf_ttrace_page_dict.count == 0); | |
129 | ||
130 | if (ttrace (TT_PROC_GET_EVENT_MASK, pid, 0, | |
131 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 132 | perror_with_name (("ttrace")); |
932936f0 MK |
133 | |
134 | tte.tte_events &= ~(TTEVT_SYSCALL_ENTRY | TTEVT_SYSCALL_RETURN); | |
135 | ||
136 | if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, | |
137 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 138 | perror_with_name (("ttrace")); |
932936f0 | 139 | |
a7be7fa8 | 140 | inf_ttrace_num_lwps_in_syscall = 0; |
932936f0 MK |
141 | } |
142 | ||
143 | /* Get information about the page at address ADDR for process PID from | |
144 | the dictionary. */ | |
145 | ||
146 | static struct inf_ttrace_page * | |
147 | inf_ttrace_get_page (pid_t pid, CORE_ADDR addr) | |
148 | { | |
149 | const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets); | |
150 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
151 | int bucket; | |
152 | struct inf_ttrace_page *page; | |
153 | ||
154 | bucket = (addr / pagesize) % num_buckets; | |
155 | page = &inf_ttrace_page_dict.buckets[bucket]; | |
156 | while (page) | |
157 | { | |
158 | if (page->addr == addr) | |
159 | break; | |
160 | ||
161 | page = page->next; | |
162 | } | |
163 | ||
164 | return page; | |
165 | } | |
166 | ||
167 | /* Add the page at address ADDR for process PID to the dictionary. */ | |
168 | ||
169 | static struct inf_ttrace_page * | |
170 | inf_ttrace_add_page (pid_t pid, CORE_ADDR addr) | |
171 | { | |
172 | const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets); | |
173 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
174 | int bucket; | |
175 | struct inf_ttrace_page *page; | |
176 | struct inf_ttrace_page *prev = NULL; | |
177 | ||
178 | bucket = (addr / pagesize) % num_buckets; | |
179 | page = &inf_ttrace_page_dict.buckets[bucket]; | |
180 | while (page) | |
181 | { | |
182 | if (page->addr == addr) | |
183 | break; | |
184 | ||
185 | prev = page; | |
186 | page = page->next; | |
187 | } | |
188 | ||
189 | if (!page) | |
190 | { | |
191 | int prot; | |
192 | ||
193 | if (ttrace (TT_PROC_GET_MPROTECT, pid, 0, | |
194 | addr, 0, (uintptr_t)&prot) == -1) | |
e2e0b3e5 | 195 | perror_with_name (("ttrace")); |
932936f0 MK |
196 | |
197 | page = XMALLOC (struct inf_ttrace_page); | |
198 | page->addr = addr; | |
199 | page->prot = prot; | |
200 | page->refcount = 0; | |
201 | page->next = NULL; | |
202 | ||
203 | page->prev = prev; | |
204 | prev->next = page; | |
205 | ||
206 | inf_ttrace_page_dict.count++; | |
207 | if (inf_ttrace_page_dict.count == 1) | |
208 | inf_ttrace_enable_syscall_events (pid); | |
209 | ||
a7be7fa8 | 210 | if (inf_ttrace_num_lwps_in_syscall == 0) |
932936f0 MK |
211 | { |
212 | if (ttrace (TT_PROC_SET_MPROTECT, pid, 0, | |
213 | addr, pagesize, prot & ~PROT_WRITE) == -1) | |
e2e0b3e5 | 214 | perror_with_name (("ttrace")); |
932936f0 MK |
215 | } |
216 | } | |
217 | ||
218 | return page; | |
219 | } | |
220 | ||
221 | /* Insert the page at address ADDR of process PID to the dictionary. */ | |
222 | ||
223 | static void | |
224 | inf_ttrace_insert_page (pid_t pid, CORE_ADDR addr) | |
225 | { | |
226 | struct inf_ttrace_page *page; | |
227 | ||
228 | page = inf_ttrace_get_page (pid, addr); | |
229 | if (!page) | |
230 | page = inf_ttrace_add_page (pid, addr); | |
231 | ||
232 | page->refcount++; | |
233 | } | |
234 | ||
235 | /* Remove the page at address ADDR of process PID from the dictionary. */ | |
236 | ||
237 | static void | |
238 | inf_ttrace_remove_page (pid_t pid, CORE_ADDR addr) | |
239 | { | |
240 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
241 | struct inf_ttrace_page *page; | |
242 | ||
243 | page = inf_ttrace_get_page (pid, addr); | |
244 | page->refcount--; | |
245 | ||
246 | gdb_assert (page->refcount >= 0); | |
247 | ||
248 | if (page->refcount == 0) | |
249 | { | |
a7be7fa8 | 250 | if (inf_ttrace_num_lwps_in_syscall == 0) |
932936f0 MK |
251 | { |
252 | if (ttrace (TT_PROC_SET_MPROTECT, pid, 0, | |
253 | addr, pagesize, page->prot) == -1) | |
e2e0b3e5 | 254 | perror_with_name (("ttrace")); |
932936f0 MK |
255 | } |
256 | ||
257 | inf_ttrace_page_dict.count--; | |
258 | if (inf_ttrace_page_dict.count == 0) | |
259 | inf_ttrace_disable_syscall_events (pid); | |
260 | ||
261 | page->prev->next = page->next; | |
262 | if (page->next) | |
263 | page->next->prev = page->prev; | |
264 | ||
265 | xfree (page); | |
266 | } | |
267 | } | |
268 | ||
269 | /* Mask the bits in PROT from the page protections that are currently | |
270 | in the dictionary for process PID. */ | |
271 | ||
272 | static void | |
273 | inf_ttrace_mask_page_protections (pid_t pid, int prot) | |
274 | { | |
275 | const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets); | |
276 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
277 | int bucket; | |
278 | ||
279 | for (bucket = 0; bucket < num_buckets; bucket++) | |
280 | { | |
281 | struct inf_ttrace_page *page; | |
282 | ||
283 | page = inf_ttrace_page_dict.buckets[bucket].next; | |
284 | while (page) | |
285 | { | |
286 | if (ttrace (TT_PROC_SET_MPROTECT, pid, 0, | |
287 | page->addr, pagesize, page->prot & ~prot) == -1) | |
e2e0b3e5 | 288 | perror_with_name (("ttrace")); |
932936f0 MK |
289 | |
290 | page = page->next; | |
291 | } | |
292 | } | |
293 | } | |
294 | ||
295 | /* Write-protect the pages in the dictionary for process PID. */ | |
296 | ||
297 | static void | |
298 | inf_ttrace_enable_page_protections (pid_t pid) | |
299 | { | |
300 | inf_ttrace_mask_page_protections (pid, PROT_WRITE); | |
301 | } | |
302 | ||
303 | /* Restore the protection of the pages in the dictionary for process | |
304 | PID. */ | |
305 | ||
306 | static void | |
307 | inf_ttrace_disable_page_protections (pid_t pid) | |
308 | { | |
309 | inf_ttrace_mask_page_protections (pid, 0); | |
310 | } | |
311 | ||
312 | /* Insert a "hardware" watchpoint for LEN bytes at address ADDR of | |
313 | type TYPE. */ | |
314 | ||
315 | static int | |
0cf6dd15 TJB |
316 | inf_ttrace_insert_watchpoint (CORE_ADDR addr, int len, int type, |
317 | struct expression *cond) | |
932936f0 MK |
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 | |
0cf6dd15 TJB |
340 | inf_ttrace_remove_watchpoint (CORE_ADDR addr, int len, int type, |
341 | struct expression *cond) | |
932936f0 MK |
342 | { |
343 | const int pagesize = inf_ttrace_page_dict.pagesize; | |
344 | pid_t pid = ptid_get_pid (inferior_ptid); | |
345 | CORE_ADDR page_addr; | |
346 | int num_pages; | |
347 | int page; | |
348 | ||
349 | gdb_assert (type == hw_write); | |
350 | ||
351 | page_addr = (addr / pagesize) * pagesize; | |
352 | num_pages = (len + pagesize - 1) / pagesize; | |
353 | ||
354 | for (page = 0; page < num_pages; page++, page_addr += pagesize) | |
355 | inf_ttrace_remove_page (pid, page_addr); | |
356 | ||
357 | return 1; | |
358 | } | |
359 | ||
360 | static int | |
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; | |
e58b0e63 PA |
416 | struct thread_info *tp = inferior_thread (); |
417 | ||
418 | gdb_assert (tp->pending_follow.kind == TARGET_WAITKIND_FORKED | |
419 | || tp->pending_follow.kind == TARGET_WAITKIND_VFORKED); | |
420 | ||
421 | pid = ptid_get_pid (inferior_ptid); | |
422 | lwpid = ptid_get_lwp (inferior_ptid); | |
b2a4db28 MK |
423 | |
424 | /* Get all important details that core GDB doesn't (and shouldn't) | |
425 | know about. */ | |
426 | if (ttrace (TT_LWP_GET_STATE, pid, lwpid, | |
427 | (uintptr_t)&tts, sizeof tts, 0) == -1) | |
428 | perror_with_name (("ttrace")); | |
429 | ||
430 | gdb_assert (tts.tts_event == TTEVT_FORK || tts.tts_event == TTEVT_VFORK); | |
431 | ||
432 | if (tts.tts_u.tts_fork.tts_isparent) | |
433 | { | |
434 | pid = tts.tts_pid; | |
435 | lwpid = tts.tts_lwpid; | |
436 | fpid = tts.tts_u.tts_fork.tts_fpid; | |
437 | flwpid = tts.tts_u.tts_fork.tts_flwpid; | |
438 | } | |
439 | else | |
440 | { | |
441 | pid = tts.tts_u.tts_fork.tts_fpid; | |
442 | lwpid = tts.tts_u.tts_fork.tts_flwpid; | |
443 | fpid = tts.tts_pid; | |
444 | flwpid = tts.tts_lwpid; | |
445 | } | |
446 | ||
447 | if (follow_child) | |
448 | { | |
77435e4c | 449 | struct inferior *inf; |
191c4426 PA |
450 | struct inferior *parent_inf; |
451 | ||
452 | parent_inf = find_inferior_pid (pid); | |
77435e4c | 453 | |
b2a4db28 | 454 | inferior_ptid = ptid_build (fpid, flwpid, 0); |
77435e4c | 455 | inf = add_inferior (fpid); |
191c4426 | 456 | inf->attach_flag = parent_inf->attach_flag; |
6c95b8df PA |
457 | inf->pspace = parent_inf->pspace; |
458 | inf->aspace = parent_inf->aspace; | |
191c4426 | 459 | copy_terminal_info (inf, parent_inf); |
b2a4db28 MK |
460 | detach_breakpoints (pid); |
461 | ||
462 | target_terminal_ours (); | |
3e43a32a MS |
463 | fprintf_unfiltered (gdb_stdlog, |
464 | _("Attaching after fork to child process %ld.\n"), | |
465 | (long)fpid); | |
b2a4db28 MK |
466 | } |
467 | else | |
468 | { | |
469 | inferior_ptid = ptid_build (pid, lwpid, 0); | |
470 | detach_breakpoints (fpid); | |
471 | ||
472 | target_terminal_ours (); | |
3e43a32a MS |
473 | fprintf_unfiltered (gdb_stdlog, |
474 | _("Detaching after fork from child process %ld.\n"), | |
475 | (long)fpid); | |
b2a4db28 MK |
476 | } |
477 | ||
478 | if (tts.tts_event == TTEVT_VFORK) | |
479 | { | |
480 | gdb_assert (!tts.tts_u.tts_fork.tts_isparent); | |
481 | ||
482 | if (follow_child) | |
483 | { | |
484 | /* We can't detach from the parent yet. */ | |
485 | inf_ttrace_vfork_ppid = pid; | |
486 | ||
487 | reattach_breakpoints (fpid); | |
488 | } | |
489 | else | |
490 | { | |
491 | if (ttrace (TT_PROC_DETACH, fpid, 0, 0, 0, 0) == -1) | |
492 | perror_with_name (("ttrace")); | |
493 | ||
494 | /* Wait till we get the TTEVT_VFORK event in the parent. | |
495 | This indicates that the child has called exec(3) or has | |
496 | exited and that the parent is ready to be traced again. */ | |
497 | if (ttrace_wait (pid, lwpid, TTRACE_WAITOK, &tts, sizeof tts) == -1) | |
498 | perror_with_name (("ttrace_wait")); | |
499 | gdb_assert (tts.tts_event == TTEVT_VFORK); | |
500 | gdb_assert (tts.tts_u.tts_fork.tts_isparent); | |
501 | ||
502 | reattach_breakpoints (pid); | |
503 | } | |
504 | } | |
505 | else | |
506 | { | |
507 | gdb_assert (tts.tts_u.tts_fork.tts_isparent); | |
508 | ||
509 | if (follow_child) | |
510 | { | |
511 | if (ttrace (TT_PROC_DETACH, pid, 0, 0, 0, 0) == -1) | |
512 | perror_with_name (("ttrace")); | |
513 | } | |
514 | else | |
515 | { | |
516 | if (ttrace (TT_PROC_DETACH, fpid, 0, 0, 0, 0) == -1) | |
517 | perror_with_name (("ttrace")); | |
518 | } | |
519 | } | |
520 | ||
521 | if (follow_child) | |
522 | { | |
2935f27f PA |
523 | struct thread_info *ti; |
524 | ||
b2a4db28 | 525 | /* The child will start out single-threaded. */ |
2935f27f | 526 | inf_ttrace_num_lwps = 1; |
b2a4db28 MK |
527 | inf_ttrace_num_lwps_in_syscall = 0; |
528 | ||
2935f27f PA |
529 | /* Delete parent. */ |
530 | delete_thread_silent (ptid_build (pid, lwpid, 0)); | |
7f9f62ba | 531 | detach_inferior (pid); |
2935f27f | 532 | |
7f9f62ba | 533 | /* Add child thread. inferior_ptid was already set above. */ |
2935f27f PA |
534 | ti = add_thread_silent (inferior_ptid); |
535 | ti->private = | |
536 | xmalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
537 | memset (ti->private, 0, | |
538 | sizeof (struct inf_ttrace_private_thread_info)); | |
b2a4db28 MK |
539 | } |
540 | ||
541 | return 0; | |
542 | } | |
543 | \f | |
544 | ||
eee22bf8 MK |
545 | /* File descriptors for pipes used as semaphores during initial |
546 | startup of an inferior. */ | |
547 | static int inf_ttrace_pfd1[2]; | |
548 | static int inf_ttrace_pfd2[2]; | |
549 | ||
550 | static void | |
551 | do_cleanup_pfds (void *dummy) | |
552 | { | |
553 | close (inf_ttrace_pfd1[0]); | |
554 | close (inf_ttrace_pfd1[1]); | |
555 | close (inf_ttrace_pfd2[0]); | |
556 | close (inf_ttrace_pfd2[1]); | |
557 | } | |
558 | ||
559 | static void | |
560 | inf_ttrace_prepare (void) | |
561 | { | |
562 | if (pipe (inf_ttrace_pfd1) == -1) | |
a3f17187 | 563 | perror_with_name (("pipe")); |
eee22bf8 MK |
564 | |
565 | if (pipe (inf_ttrace_pfd2) == -1) | |
566 | { | |
567 | close (inf_ttrace_pfd1[0]); | |
568 | close (inf_ttrace_pfd2[0]); | |
a3f17187 | 569 | perror_with_name (("pipe")); |
eee22bf8 MK |
570 | } |
571 | } | |
572 | ||
573 | /* Prepare to be traced. */ | |
574 | ||
575 | static void | |
576 | inf_ttrace_me (void) | |
577 | { | |
578 | struct cleanup *old_chain = make_cleanup (do_cleanup_pfds, 0); | |
579 | char c; | |
580 | ||
581 | /* "Trace me, Dr. Memory!" */ | |
582 | if (ttrace (TT_PROC_SETTRC, 0, 0, 0, TT_VERSION, 0) == -1) | |
e2e0b3e5 | 583 | perror_with_name (("ttrace")); |
eee22bf8 MK |
584 | |
585 | /* Tell our parent that we are ready to be traced. */ | |
586 | if (write (inf_ttrace_pfd1[1], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 587 | perror_with_name (("write")); |
eee22bf8 MK |
588 | |
589 | /* Wait until our parent has set the initial event mask. */ | |
590 | if (read (inf_ttrace_pfd2[0], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 591 | perror_with_name (("read")); |
eee22bf8 MK |
592 | |
593 | do_cleanups (old_chain); | |
594 | } | |
595 | ||
596 | /* Start tracing PID. */ | |
597 | ||
598 | static void | |
28439f5e | 599 | inf_ttrace_him (struct target_ops *ops, int pid) |
eee22bf8 MK |
600 | { |
601 | struct cleanup *old_chain = make_cleanup (do_cleanup_pfds, 0); | |
602 | ttevent_t tte; | |
eee22bf8 MK |
603 | char c; |
604 | ||
605 | /* Wait until our child is ready to be traced. */ | |
606 | if (read (inf_ttrace_pfd1[0], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 607 | perror_with_name (("read")); |
eee22bf8 MK |
608 | |
609 | /* Set the initial event mask. */ | |
610 | memset (&tte, 0, sizeof (tte)); | |
b2a4db28 | 611 | tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT | TTEVT_FORK | TTEVT_VFORK; |
a7be7fa8 | 612 | tte.tte_events |= TTEVT_LWP_CREATE | TTEVT_LWP_EXIT | TTEVT_LWP_TERMINATE; |
7ba0e0c2 MK |
613 | #ifdef TTEVT_BPT_SSTEP |
614 | tte.tte_events |= TTEVT_BPT_SSTEP; | |
615 | #endif | |
b2a4db28 | 616 | tte.tte_opts |= TTEO_PROC_INHERIT; |
eee22bf8 MK |
617 | if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, |
618 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 619 | perror_with_name (("ttrace")); |
eee22bf8 MK |
620 | |
621 | /* Tell our child that we have set the initial event mask. */ | |
622 | if (write (inf_ttrace_pfd2[1], &c, sizeof c) != sizeof c) | |
e2e0b3e5 | 623 | perror_with_name (("write")); |
eee22bf8 MK |
624 | |
625 | do_cleanups (old_chain); | |
626 | ||
28439f5e | 627 | push_target (ops); |
eee22bf8 | 628 | |
eee22bf8 MK |
629 | /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h, and will |
630 | be 1 or 2 depending on whether we're starting without or with a | |
631 | shell. */ | |
632 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); | |
633 | ||
634 | /* On some targets, there must be some explicit actions taken after | |
635 | the inferior has been started up. */ | |
636 | target_post_startup_inferior (pid_to_ptid (pid)); | |
637 | } | |
638 | ||
639 | static void | |
136d6dae VP |
640 | inf_ttrace_create_inferior (struct target_ops *ops, char *exec_file, |
641 | char *allargs, char **env, int from_tty) | |
eee22bf8 | 642 | { |
28439f5e PA |
643 | int pid; |
644 | ||
a7be7fa8 MK |
645 | gdb_assert (inf_ttrace_num_lwps == 0); |
646 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); | |
932936f0 | 647 | gdb_assert (inf_ttrace_page_dict.count == 0); |
932936f0 | 648 | gdb_assert (inf_ttrace_reenable_page_protections == 0); |
b2a4db28 | 649 | gdb_assert (inf_ttrace_vfork_ppid == -1); |
932936f0 | 650 | |
28439f5e | 651 | pid = fork_inferior (exec_file, allargs, env, inf_ttrace_me, NULL, |
e69860f1 | 652 | inf_ttrace_prepare, NULL, NULL); |
28439f5e PA |
653 | |
654 | inf_ttrace_him (ops, pid); | |
eee22bf8 MK |
655 | } |
656 | ||
eee22bf8 | 657 | static void |
136d6dae | 658 | inf_ttrace_mourn_inferior (struct target_ops *ops) |
eee22bf8 | 659 | { |
932936f0 MK |
660 | const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets); |
661 | int bucket; | |
662 | ||
a7be7fa8 MK |
663 | inf_ttrace_num_lwps = 0; |
664 | inf_ttrace_num_lwps_in_syscall = 0; | |
932936f0 MK |
665 | |
666 | for (bucket = 0; bucket < num_buckets; bucket++) | |
667 | { | |
668 | struct inf_ttrace_page *page; | |
669 | struct inf_ttrace_page *next; | |
670 | ||
671 | page = inf_ttrace_page_dict.buckets[bucket].next; | |
672 | while (page) | |
673 | { | |
674 | next = page->next; | |
675 | xfree (page); | |
676 | page = next; | |
677 | } | |
678 | } | |
679 | inf_ttrace_page_dict.count = 0; | |
680 | ||
28439f5e | 681 | unpush_target (ops); |
eee22bf8 MK |
682 | generic_mourn_inferior (); |
683 | } | |
684 | ||
f688d93f JB |
685 | /* Assuming we just attached the debugger to a new inferior, create |
686 | a new thread_info structure for each thread, and add it to our | |
687 | list of threads. */ | |
688 | ||
689 | static void | |
690 | inf_ttrace_create_threads_after_attach (int pid) | |
691 | { | |
692 | int status; | |
693 | ptid_t ptid; | |
694 | ttstate_t tts; | |
695 | struct thread_info *ti; | |
696 | ||
697 | status = ttrace (TT_PROC_GET_FIRST_LWP_STATE, pid, 0, | |
698 | (uintptr_t) &tts, sizeof (ttstate_t), 0); | |
699 | if (status < 0) | |
700 | perror_with_name (_("TT_PROC_GET_FIRST_LWP_STATE ttrace call failed")); | |
701 | gdb_assert (tts.tts_pid == pid); | |
702 | ||
703 | /* Add the stopped thread. */ | |
704 | ptid = ptid_build (pid, tts.tts_lwpid, 0); | |
705 | ti = add_thread (ptid); | |
706 | ti->private = xzalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
707 | inf_ttrace_num_lwps++; | |
708 | ||
709 | /* We use the "first stopped thread" as the currently active thread. */ | |
710 | inferior_ptid = ptid; | |
711 | ||
712 | /* Iterative over all the remaining threads. */ | |
713 | ||
714 | for (;;) | |
715 | { | |
716 | ptid_t ptid; | |
717 | ||
718 | status = ttrace (TT_PROC_GET_NEXT_LWP_STATE, pid, 0, | |
719 | (uintptr_t) &tts, sizeof (ttstate_t), 0); | |
720 | if (status < 0) | |
721 | perror_with_name (_("TT_PROC_GET_NEXT_LWP_STATE ttrace call failed")); | |
722 | if (status == 0) | |
723 | break; /* End of list. */ | |
724 | ||
725 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); | |
726 | ti = add_thread (ptid); | |
727 | ti->private = xzalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
728 | inf_ttrace_num_lwps++; | |
729 | } | |
730 | } | |
731 | ||
eee22bf8 | 732 | static void |
136d6dae | 733 | inf_ttrace_attach (struct target_ops *ops, char *args, int from_tty) |
eee22bf8 MK |
734 | { |
735 | char *exec_file; | |
736 | pid_t pid; | |
932936f0 | 737 | ttevent_t tte; |
181e7f93 | 738 | struct inferior *inf; |
eee22bf8 | 739 | |
74164c56 | 740 | pid = parse_pid_to_attach (args); |
eee22bf8 MK |
741 | |
742 | if (pid == getpid ()) /* Trying to masturbate? */ | |
8a3fe4f8 | 743 | error (_("I refuse to debug myself!")); |
eee22bf8 MK |
744 | |
745 | if (from_tty) | |
746 | { | |
346e281c | 747 | exec_file = get_exec_file (0); |
eee22bf8 MK |
748 | |
749 | if (exec_file) | |
a3f17187 | 750 | printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
eee22bf8 MK |
751 | target_pid_to_str (pid_to_ptid (pid))); |
752 | else | |
a3f17187 | 753 | printf_unfiltered (_("Attaching to %s\n"), |
eee22bf8 MK |
754 | target_pid_to_str (pid_to_ptid (pid))); |
755 | ||
756 | gdb_flush (gdb_stdout); | |
757 | } | |
758 | ||
a7be7fa8 MK |
759 | gdb_assert (inf_ttrace_num_lwps == 0); |
760 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); | |
b2a4db28 | 761 | gdb_assert (inf_ttrace_vfork_ppid == -1); |
a7be7fa8 | 762 | |
eee22bf8 | 763 | if (ttrace (TT_PROC_ATTACH, pid, 0, TT_KILL_ON_EXIT, TT_VERSION, 0) == -1) |
e2e0b3e5 | 764 | perror_with_name (("ttrace")); |
eee22bf8 | 765 | |
6c95b8df PA |
766 | inf = current_inferior (); |
767 | inferior_appeared (inf, pid); | |
181e7f93 | 768 | inf->attach_flag = 1; |
7f9f62ba | 769 | |
932936f0 | 770 | /* Set the initial event mask. */ |
932936f0 | 771 | memset (&tte, 0, sizeof (tte)); |
b2a4db28 | 772 | tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT | TTEVT_FORK | TTEVT_VFORK; |
a7be7fa8 | 773 | tte.tte_events |= TTEVT_LWP_CREATE | TTEVT_LWP_EXIT | TTEVT_LWP_TERMINATE; |
7ba0e0c2 MK |
774 | #ifdef TTEVT_BPT_SSTEP |
775 | tte.tte_events |= TTEVT_BPT_SSTEP; | |
776 | #endif | |
b2a4db28 | 777 | tte.tte_opts |= TTEO_PROC_INHERIT; |
932936f0 MK |
778 | if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, |
779 | (uintptr_t)&tte, sizeof tte, 0) == -1) | |
e2e0b3e5 | 780 | perror_with_name (("ttrace")); |
932936f0 | 781 | |
28439f5e | 782 | push_target (ops); |
2935f27f | 783 | |
f688d93f | 784 | inf_ttrace_create_threads_after_attach (pid); |
eee22bf8 MK |
785 | } |
786 | ||
787 | static void | |
136d6dae | 788 | inf_ttrace_detach (struct target_ops *ops, char *args, int from_tty) |
eee22bf8 | 789 | { |
eee22bf8 | 790 | pid_t pid = ptid_get_pid (inferior_ptid); |
5d426ff1 | 791 | int sig = 0; |
eee22bf8 MK |
792 | |
793 | if (from_tty) | |
794 | { | |
795 | char *exec_file = get_exec_file (0); | |
796 | if (exec_file == 0) | |
797 | exec_file = ""; | |
a3f17187 | 798 | printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file, |
eee22bf8 MK |
799 | target_pid_to_str (pid_to_ptid (pid))); |
800 | gdb_flush (gdb_stdout); | |
801 | } | |
802 | if (args) | |
803 | sig = atoi (args); | |
804 | ||
805 | /* ??? The HP-UX 11.0 ttrace(2) manual page doesn't mention that we | |
806 | can pass a signal number here. Does this really work? */ | |
807 | if (ttrace (TT_PROC_DETACH, pid, 0, 0, sig, 0) == -1) | |
e2e0b3e5 | 808 | perror_with_name (("ttrace")); |
eee22bf8 | 809 | |
b2a4db28 MK |
810 | if (inf_ttrace_vfork_ppid != -1) |
811 | { | |
812 | if (ttrace (TT_PROC_DETACH, inf_ttrace_vfork_ppid, 0, 0, 0, 0) == -1) | |
813 | perror_with_name (("ttrace")); | |
814 | inf_ttrace_vfork_ppid = -1; | |
815 | } | |
816 | ||
a7be7fa8 MK |
817 | inf_ttrace_num_lwps = 0; |
818 | inf_ttrace_num_lwps_in_syscall = 0; | |
932936f0 | 819 | |
932936f0 | 820 | inferior_ptid = null_ptid; |
7f9f62ba PA |
821 | detach_inferior (pid); |
822 | ||
28439f5e | 823 | unpush_target (ops); |
eee22bf8 MK |
824 | } |
825 | ||
346e281c | 826 | static void |
7d85a9c0 | 827 | inf_ttrace_kill (struct target_ops *ops) |
346e281c MK |
828 | { |
829 | pid_t pid = ptid_get_pid (inferior_ptid); | |
830 | ||
831 | if (pid == 0) | |
832 | return; | |
833 | ||
834 | if (ttrace (TT_PROC_EXIT, pid, 0, 0, 0, 0) == -1) | |
835 | perror_with_name (("ttrace")); | |
836 | /* ??? Is it necessary to call ttrace_wait() here? */ | |
837 | ||
838 | if (inf_ttrace_vfork_ppid != -1) | |
839 | { | |
840 | if (ttrace (TT_PROC_DETACH, inf_ttrace_vfork_ppid, 0, 0, 0, 0) == -1) | |
841 | perror_with_name (("ttrace")); | |
842 | inf_ttrace_vfork_ppid = -1; | |
843 | } | |
844 | ||
845 | target_mourn_inferior (); | |
846 | } | |
847 | ||
438ac09b PA |
848 | /* Check is a dying thread is dead by now, and delete it from GDBs |
849 | thread list if so. */ | |
7ba0e0c2 | 850 | static int |
438ac09b | 851 | inf_ttrace_delete_dead_threads_callback (struct thread_info *info, void *arg) |
7ba0e0c2 | 852 | { |
438ac09b PA |
853 | lwpid_t lwpid; |
854 | struct inf_ttrace_private_thread_info *p; | |
7ba0e0c2 | 855 | |
438ac09b PA |
856 | if (is_exited (info->ptid)) |
857 | return 0; | |
858 | ||
859 | lwpid = ptid_get_lwp (info->ptid); | |
860 | p = (struct inf_ttrace_private_thread_info *) info->private; | |
861 | ||
862 | /* Check if an lwp that was dying is still there or not. */ | |
863 | if (p->dying && (kill (lwpid, 0) == -1)) | |
864 | /* It's gone now. */ | |
865 | delete_thread (info->ptid); | |
7ba0e0c2 MK |
866 | |
867 | return 0; | |
868 | } | |
869 | ||
438ac09b PA |
870 | /* Resume the lwp pointed to by INFO, with REQUEST, and pass it signal |
871 | SIG. */ | |
872 | ||
873 | static void | |
874 | inf_ttrace_resume_lwp (struct thread_info *info, ttreq_t request, int sig) | |
875 | { | |
876 | pid_t pid = ptid_get_pid (info->ptid); | |
877 | lwpid_t lwpid = ptid_get_lwp (info->ptid); | |
878 | ||
879 | if (ttrace (request, pid, lwpid, TT_NOPC, sig, 0) == -1) | |
880 | { | |
881 | struct inf_ttrace_private_thread_info *p | |
882 | = (struct inf_ttrace_private_thread_info *) info->private; | |
883 | if (p->dying && errno == EPROTO) | |
884 | /* This is expected, it means the dying lwp is really gone | |
885 | by now. If ttrace had an event to inform the debugger | |
886 | the lwp is really gone, this wouldn't be needed. */ | |
887 | delete_thread (info->ptid); | |
888 | else | |
889 | /* This was really unexpected. */ | |
890 | perror_with_name (("ttrace")); | |
891 | } | |
892 | } | |
893 | ||
894 | /* Callback for iterate_over_threads. */ | |
895 | ||
60e2c248 | 896 | static int |
438ac09b | 897 | inf_ttrace_resume_callback (struct thread_info *info, void *arg) |
60e2c248 | 898 | { |
438ac09b PA |
899 | if (!ptid_equal (info->ptid, inferior_ptid) && !is_exited (info->ptid)) |
900 | inf_ttrace_resume_lwp (info, TT_LWP_CONTINUE, 0); | |
901 | ||
60e2c248 JG |
902 | return 0; |
903 | } | |
904 | ||
eee22bf8 | 905 | static void |
28439f5e PA |
906 | inf_ttrace_resume (struct target_ops *ops, |
907 | ptid_t ptid, int step, enum target_signal signal) | |
eee22bf8 | 908 | { |
438ac09b | 909 | int resume_all; |
eee22bf8 MK |
910 | ttreq_t request = step ? TT_LWP_SINGLE : TT_LWP_CONTINUE; |
911 | int sig = target_signal_to_host (signal); | |
438ac09b | 912 | struct thread_info *info; |
eee22bf8 | 913 | |
438ac09b PA |
914 | /* A specific PTID means `step only this process id'. */ |
915 | resume_all = (ptid_equal (ptid, minus_one_ptid)); | |
eee22bf8 | 916 | |
438ac09b PA |
917 | /* If resuming all threads, it's the current thread that should be |
918 | handled specially. */ | |
919 | if (resume_all) | |
920 | ptid = inferior_ptid; | |
eee22bf8 | 921 | |
e09875d4 | 922 | info = find_thread_ptid (ptid); |
438ac09b PA |
923 | inf_ttrace_resume_lwp (info, request, sig); |
924 | ||
925 | if (resume_all) | |
926 | /* Let all the other threads run too. */ | |
927 | iterate_over_threads (inf_ttrace_resume_callback, NULL); | |
eee22bf8 MK |
928 | } |
929 | ||
930 | static ptid_t | |
117de6a9 | 931 | inf_ttrace_wait (struct target_ops *ops, |
47608cb1 | 932 | ptid_t ptid, struct target_waitstatus *ourstatus, int options) |
eee22bf8 MK |
933 | { |
934 | pid_t pid = ptid_get_pid (ptid); | |
935 | lwpid_t lwpid = ptid_get_lwp (ptid); | |
936 | ttstate_t tts; | |
60e2c248 | 937 | struct thread_info *ti; |
3a3e9ee3 | 938 | ptid_t related_ptid; |
eee22bf8 | 939 | |
932936f0 | 940 | /* Until proven otherwise. */ |
a7be7fa8 | 941 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; |
eee22bf8 MK |
942 | |
943 | if (pid == -1) | |
b2a4db28 | 944 | pid = lwpid = 0; |
eee22bf8 | 945 | |
b2a4db28 | 946 | gdb_assert (pid != 0 || lwpid == 0); |
eee22bf8 MK |
947 | |
948 | do | |
949 | { | |
950 | set_sigint_trap (); | |
eee22bf8 MK |
951 | |
952 | if (ttrace_wait (pid, lwpid, TTRACE_WAITOK, &tts, sizeof tts) == -1) | |
a3f17187 | 953 | perror_with_name (("ttrace_wait")); |
eee22bf8 | 954 | |
b2a4db28 MK |
955 | if (tts.tts_event == TTEVT_VFORK && tts.tts_u.tts_fork.tts_isparent) |
956 | { | |
957 | if (inf_ttrace_vfork_ppid != -1) | |
958 | { | |
959 | gdb_assert (inf_ttrace_vfork_ppid == tts.tts_pid); | |
960 | ||
961 | if (ttrace (TT_PROC_DETACH, tts.tts_pid, 0, 0, 0, 0) == -1) | |
962 | perror_with_name (("ttrace")); | |
963 | inf_ttrace_vfork_ppid = -1; | |
964 | } | |
965 | ||
966 | tts.tts_event = TTEVT_NONE; | |
967 | } | |
968 | ||
eee22bf8 MK |
969 | clear_sigint_trap (); |
970 | } | |
971 | while (tts.tts_event == TTEVT_NONE); | |
972 | ||
932936f0 MK |
973 | /* Now that we've waited, we can re-enable the page protections. */ |
974 | if (inf_ttrace_reenable_page_protections) | |
975 | { | |
a7be7fa8 | 976 | gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); |
932936f0 MK |
977 | inf_ttrace_enable_page_protections (tts.tts_pid); |
978 | inf_ttrace_reenable_page_protections = 0; | |
979 | } | |
980 | ||
a7be7fa8 MK |
981 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); |
982 | ||
2935f27f PA |
983 | if (inf_ttrace_num_lwps == 0) |
984 | { | |
985 | struct thread_info *ti; | |
986 | ||
987 | inf_ttrace_num_lwps = 1; | |
988 | ||
989 | /* This is the earliest we hear about the lwp member of | |
990 | INFERIOR_PTID, after an attach or fork_inferior. */ | |
991 | gdb_assert (ptid_get_lwp (inferior_ptid) == 0); | |
992 | ||
993 | /* We haven't set the private member on the main thread yet. Do | |
994 | it now. */ | |
e09875d4 | 995 | ti = find_thread_ptid (inferior_ptid); |
2935f27f PA |
996 | gdb_assert (ti != NULL && ti->private == NULL); |
997 | ti->private = | |
998 | xmalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
999 | memset (ti->private, 0, | |
1000 | sizeof (struct inf_ttrace_private_thread_info)); | |
1001 | ||
1002 | /* Notify the core that this ptid changed. This changes | |
1003 | inferior_ptid as well. */ | |
1004 | thread_change_ptid (inferior_ptid, ptid); | |
1005 | } | |
1006 | ||
eee22bf8 MK |
1007 | switch (tts.tts_event) |
1008 | { | |
7ba0e0c2 MK |
1009 | #ifdef TTEVT_BPT_SSTEP |
1010 | case TTEVT_BPT_SSTEP: | |
1011 | /* Make it look like a breakpoint. */ | |
1012 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
1013 | ourstatus->value.sig = TARGET_SIGNAL_TRAP; | |
1014 | break; | |
1015 | #endif | |
1016 | ||
eee22bf8 | 1017 | case TTEVT_EXEC: |
5d426ff1 MK |
1018 | ourstatus->kind = TARGET_WAITKIND_EXECD; |
1019 | ourstatus->value.execd_pathname = | |
1020 | xmalloc (tts.tts_u.tts_exec.tts_pathlen + 1); | |
1021 | if (ttrace (TT_PROC_GET_PATHNAME, tts.tts_pid, 0, | |
1022 | (uintptr_t)ourstatus->value.execd_pathname, | |
1023 | tts.tts_u.tts_exec.tts_pathlen, 0) == -1) | |
1024 | perror_with_name (("ttrace")); | |
1025 | ourstatus->value.execd_pathname[tts.tts_u.tts_exec.tts_pathlen] = 0; | |
25b22b0a PA |
1026 | |
1027 | /* At this point, all inserted breakpoints are gone. Doing this | |
1028 | as soon as we detect an exec prevents the badness of deleting | |
1029 | a breakpoint writing the current "shadow contents" to lift | |
1030 | the bp. That shadow is NOT valid after an exec. */ | |
1031 | mark_breakpoints_out (); | |
eee22bf8 | 1032 | break; |
932936f0 | 1033 | |
eee22bf8 MK |
1034 | case TTEVT_EXIT: |
1035 | store_waitstatus (ourstatus, tts.tts_u.tts_exit.tts_exitcode); | |
a7be7fa8 MK |
1036 | inf_ttrace_num_lwps = 0; |
1037 | break; | |
1038 | ||
b2a4db28 | 1039 | case TTEVT_FORK: |
3a3e9ee3 PA |
1040 | related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid, |
1041 | tts.tts_u.tts_fork.tts_flwpid, 0); | |
1042 | ||
b2a4db28 | 1043 | ourstatus->kind = TARGET_WAITKIND_FORKED; |
3a3e9ee3 | 1044 | ourstatus->value.related_pid = related_ptid; |
b2a4db28 MK |
1045 | |
1046 | /* Make sure the other end of the fork is stopped too. */ | |
1047 | if (ttrace_wait (tts.tts_u.tts_fork.tts_fpid, | |
1048 | tts.tts_u.tts_fork.tts_flwpid, | |
1049 | TTRACE_WAITOK, &tts, sizeof tts) == -1) | |
1050 | perror_with_name (("ttrace_wait")); | |
1051 | ||
1052 | gdb_assert (tts.tts_event == TTEVT_FORK); | |
1053 | if (tts.tts_u.tts_fork.tts_isparent) | |
1054 | { | |
3a3e9ee3 PA |
1055 | related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid, |
1056 | tts.tts_u.tts_fork.tts_flwpid, 0); | |
b2a4db28 | 1057 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); |
3a3e9ee3 | 1058 | ourstatus->value.related_pid = related_ptid; |
b2a4db28 MK |
1059 | } |
1060 | break; | |
1061 | ||
1062 | case TTEVT_VFORK: | |
1063 | gdb_assert (!tts.tts_u.tts_fork.tts_isparent); | |
1064 | ||
3a3e9ee3 PA |
1065 | related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid, |
1066 | tts.tts_u.tts_fork.tts_flwpid, 0); | |
1067 | ||
b2a4db28 | 1068 | ourstatus->kind = TARGET_WAITKIND_VFORKED; |
3a3e9ee3 | 1069 | ourstatus->value.related_pid = related_ptid; |
b2a4db28 MK |
1070 | |
1071 | /* HACK: To avoid touching the parent during the vfork, switch | |
1072 | away from it. */ | |
1073 | inferior_ptid = ptid; | |
1074 | break; | |
1075 | ||
a7be7fa8 MK |
1076 | case TTEVT_LWP_CREATE: |
1077 | lwpid = tts.tts_u.tts_thread.tts_target_lwpid; | |
1078 | ptid = ptid_build (tts.tts_pid, lwpid, 0); | |
60e2c248 JG |
1079 | ti = add_thread (ptid); |
1080 | ti->private = | |
1081 | xmalloc (sizeof (struct inf_ttrace_private_thread_info)); | |
1082 | memset (ti->private, 0, | |
1083 | sizeof (struct inf_ttrace_private_thread_info)); | |
a7be7fa8 MK |
1084 | inf_ttrace_num_lwps++; |
1085 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); | |
62a93fa9 PA |
1086 | /* Let the lwp_create-caller thread continue. */ |
1087 | ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid), | |
1088 | ptid_get_lwp (ptid), TT_NOPC, 0, 0); | |
1089 | /* Return without stopping the whole process. */ | |
1090 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
1091 | return ptid; | |
a7be7fa8 MK |
1092 | |
1093 | case TTEVT_LWP_EXIT: | |
17faa917 DJ |
1094 | if (print_thread_events) |
1095 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (ptid)); | |
e09875d4 | 1096 | ti = find_thread_ptid (ptid); |
60e2c248 JG |
1097 | gdb_assert (ti != NULL); |
1098 | ((struct inf_ttrace_private_thread_info *)ti->private)->dying = 1; | |
a7be7fa8 | 1099 | inf_ttrace_num_lwps--; |
62a93fa9 | 1100 | /* Let the thread really exit. */ |
60e2c248 JG |
1101 | ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid), |
1102 | ptid_get_lwp (ptid), TT_NOPC, 0, 0); | |
62a93fa9 PA |
1103 | /* Return without stopping the whole process. */ |
1104 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
1105 | return ptid; | |
a7be7fa8 MK |
1106 | |
1107 | case TTEVT_LWP_TERMINATE: | |
1108 | lwpid = tts.tts_u.tts_thread.tts_target_lwpid; | |
1109 | ptid = ptid_build (tts.tts_pid, lwpid, 0); | |
62a93fa9 | 1110 | if (print_thread_events) |
b861ac81 | 1111 | printf_unfiltered(_("[%s has been terminated]\n"), |
62a93fa9 | 1112 | target_pid_to_str (ptid)); |
e09875d4 | 1113 | ti = find_thread_ptid (ptid); |
60e2c248 JG |
1114 | gdb_assert (ti != NULL); |
1115 | ((struct inf_ttrace_private_thread_info *)ti->private)->dying = 1; | |
a7be7fa8 | 1116 | inf_ttrace_num_lwps--; |
62a93fa9 PA |
1117 | |
1118 | /* Resume the lwp_terminate-caller thread. */ | |
a7be7fa8 | 1119 | ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); |
62a93fa9 PA |
1120 | ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid), |
1121 | ptid_get_lwp (ptid), TT_NOPC, 0, 0); | |
1122 | /* Return without stopping the whole process. */ | |
1123 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
1124 | return ptid; | |
932936f0 | 1125 | |
eee22bf8 MK |
1126 | case TTEVT_SIGNAL: |
1127 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
1128 | ourstatus->value.sig = | |
1129 | target_signal_from_host (tts.tts_u.tts_signal.tts_signo); | |
1130 | break; | |
932936f0 MK |
1131 | |
1132 | case TTEVT_SYSCALL_ENTRY: | |
1133 | gdb_assert (inf_ttrace_reenable_page_protections == 0); | |
a7be7fa8 MK |
1134 | inf_ttrace_num_lwps_in_syscall++; |
1135 | if (inf_ttrace_num_lwps_in_syscall == 1) | |
932936f0 MK |
1136 | { |
1137 | /* A thread has just entered a system call. Disable any | |
1138 | page protections as the kernel can't deal with them. */ | |
1139 | inf_ttrace_disable_page_protections (tts.tts_pid); | |
1140 | } | |
1141 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_ENTRY; | |
01dedca2 | 1142 | ourstatus->value.syscall_number = tts.tts_scno; |
932936f0 MK |
1143 | break; |
1144 | ||
1145 | case TTEVT_SYSCALL_RETURN: | |
a7be7fa8 | 1146 | if (inf_ttrace_num_lwps_in_syscall > 0) |
932936f0 MK |
1147 | { |
1148 | /* If the last thread has just left the system call, this | |
1149 | would be a logical place to re-enable the page | |
1150 | protections, but that doesn't work. We can't re-enable | |
1151 | them until we've done another wait. */ | |
1152 | inf_ttrace_reenable_page_protections = | |
a7be7fa8 MK |
1153 | (inf_ttrace_num_lwps_in_syscall == 1); |
1154 | inf_ttrace_num_lwps_in_syscall--; | |
932936f0 MK |
1155 | } |
1156 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_RETURN; | |
01dedca2 | 1157 | ourstatus->value.syscall_number = tts.tts_scno; |
932936f0 | 1158 | break; |
a7be7fa8 MK |
1159 | |
1160 | default: | |
1161 | gdb_assert (!"Unexpected ttrace event"); | |
1162 | break; | |
eee22bf8 MK |
1163 | } |
1164 | ||
1165 | /* Make sure all threads within the process are stopped. */ | |
1166 | if (ttrace (TT_PROC_STOP, tts.tts_pid, 0, 0, 0, 0) == -1) | |
e2e0b3e5 | 1167 | perror_with_name (("ttrace")); |
eee22bf8 | 1168 | |
438ac09b PA |
1169 | /* Now that the whole process is stopped, check if any dying thread |
1170 | is really dead by now. If a dying thread is still alive, it will | |
1171 | be stopped too, and will still show up in `info threads', tagged | |
1172 | with "(Exiting)". We could make `info threads' prune dead | |
1173 | threads instead via inf_ttrace_thread_alive, but doing this here | |
1174 | has the advantage that a frontend is notificed sooner of thread | |
1175 | exits. Note that a dying lwp is still alive, it still has to be | |
1176 | resumed, like any other lwp. */ | |
1177 | iterate_over_threads (inf_ttrace_delete_dead_threads_callback, NULL); | |
1178 | ||
a7be7fa8 | 1179 | return ptid; |
eee22bf8 MK |
1180 | } |
1181 | ||
1182 | /* Transfer LEN bytes from ADDR in the inferior's memory into READBUF, | |
1183 | and transfer LEN bytes from WRITEBUF into the inferior's memory at | |
1184 | ADDR. Either READBUF or WRITEBUF may be null, in which case the | |
1185 | corresponding transfer doesn't happen. Return the number of bytes | |
1186 | actually transferred (which may be zero if an error occurs). */ | |
1187 | ||
1188 | static LONGEST | |
1189 | inf_ttrace_xfer_memory (CORE_ADDR addr, ULONGEST len, | |
1190 | void *readbuf, const void *writebuf) | |
1191 | { | |
1192 | pid_t pid = ptid_get_pid (inferior_ptid); | |
1193 | ||
1194 | /* HP-UX treats text space and data space differently. GDB however, | |
1195 | doesn't really know the difference. Therefore we try both. Try | |
1196 | text space before data space though because when we're writing | |
1197 | into text space the instruction cache might need to be flushed. */ | |
1198 | ||
1199 | if (readbuf | |
1200 | && ttrace (TT_PROC_RDTEXT, pid, 0, addr, len, (uintptr_t)readbuf) == -1 | |
1201 | && ttrace (TT_PROC_RDDATA, pid, 0, addr, len, (uintptr_t)readbuf) == -1) | |
1202 | return 0; | |
1203 | ||
1204 | if (writebuf | |
1205 | && ttrace (TT_PROC_WRTEXT, pid, 0, addr, len, (uintptr_t)writebuf) == -1 | |
1206 | && ttrace (TT_PROC_WRDATA, pid, 0, addr, len, (uintptr_t)writebuf) == -1) | |
1207 | return 0; | |
1208 | ||
1209 | return len; | |
1210 | } | |
1211 | ||
1212 | static LONGEST | |
1213 | inf_ttrace_xfer_partial (struct target_ops *ops, enum target_object object, | |
7a4609f7 | 1214 | const char *annex, gdb_byte *readbuf, |
3e43a32a MS |
1215 | const gdb_byte *writebuf, |
1216 | ULONGEST offset, LONGEST len) | |
eee22bf8 MK |
1217 | { |
1218 | switch (object) | |
1219 | { | |
1220 | case TARGET_OBJECT_MEMORY: | |
1221 | return inf_ttrace_xfer_memory (offset, len, readbuf, writebuf); | |
1222 | ||
1223 | case TARGET_OBJECT_UNWIND_TABLE: | |
1224 | return -1; | |
1225 | ||
1226 | case TARGET_OBJECT_AUXV: | |
1227 | return -1; | |
1228 | ||
1229 | case TARGET_OBJECT_WCOOKIE: | |
1230 | return -1; | |
1231 | ||
1232 | default: | |
1233 | return -1; | |
1234 | } | |
1235 | } | |
1236 | ||
1237 | /* Print status information about what we're accessing. */ | |
1238 | ||
1239 | static void | |
1240 | inf_ttrace_files_info (struct target_ops *ignore) | |
1241 | { | |
181e7f93 | 1242 | struct inferior *inf = current_inferior (); |
346e281c | 1243 | printf_filtered (_("\tUsing the running image of %s %s.\n"), |
181e7f93 | 1244 | inf->attach_flag ? "attached" : "child", |
346e281c | 1245 | target_pid_to_str (inferior_ptid)); |
eee22bf8 | 1246 | } |
a7be7fa8 MK |
1247 | |
1248 | static int | |
28439f5e | 1249 | inf_ttrace_thread_alive (struct target_ops *ops, ptid_t ptid) |
a7be7fa8 | 1250 | { |
438ac09b PA |
1251 | return 1; |
1252 | } | |
1253 | ||
1254 | /* Return a string describing the state of the thread specified by | |
1255 | INFO. */ | |
1256 | ||
1257 | static char * | |
1258 | inf_ttrace_extra_thread_info (struct thread_info *info) | |
1259 | { | |
1260 | struct inf_ttrace_private_thread_info* private = | |
1261 | (struct inf_ttrace_private_thread_info *) info->private; | |
1262 | ||
1263 | if (private != NULL && private->dying) | |
1264 | return "Exiting"; | |
1265 | ||
1266 | return NULL; | |
a7be7fa8 MK |
1267 | } |
1268 | ||
1269 | static char * | |
117de6a9 | 1270 | inf_ttrace_pid_to_str (struct target_ops *ops, ptid_t ptid) |
a7be7fa8 | 1271 | { |
2935f27f PA |
1272 | pid_t pid = ptid_get_pid (ptid); |
1273 | lwpid_t lwpid = ptid_get_lwp (ptid); | |
1274 | static char buf[128]; | |
a7be7fa8 | 1275 | |
2935f27f PA |
1276 | if (lwpid == 0) |
1277 | xsnprintf (buf, sizeof buf, "process %ld", | |
1278 | (long) pid); | |
1279 | else | |
1280 | xsnprintf (buf, sizeof buf, "process %ld, lwp %ld", | |
1281 | (long) pid, (long) lwpid); | |
1282 | return buf; | |
a7be7fa8 | 1283 | } |
eee22bf8 MK |
1284 | \f |
1285 | ||
fa07e785 JB |
1286 | /* Implement the get_ada_task_ptid target_ops method. */ |
1287 | ||
1288 | static ptid_t | |
1289 | inf_ttrace_get_ada_task_ptid (long lwp, long thread) | |
1290 | { | |
1291 | return ptid_build (ptid_get_pid (inferior_ptid), lwp, 0); | |
1292 | } | |
1293 | ||
1294 | \f | |
eee22bf8 MK |
1295 | struct target_ops * |
1296 | inf_ttrace_target (void) | |
1297 | { | |
1298 | struct target_ops *t = inf_child_target (); | |
1299 | ||
eee22bf8 MK |
1300 | t->to_attach = inf_ttrace_attach; |
1301 | t->to_detach = inf_ttrace_detach; | |
1302 | t->to_resume = inf_ttrace_resume; | |
1303 | t->to_wait = inf_ttrace_wait; | |
eee22bf8 | 1304 | t->to_files_info = inf_ttrace_files_info; |
932936f0 | 1305 | t->to_can_use_hw_breakpoint = inf_ttrace_can_use_hw_breakpoint; |
932936f0 MK |
1306 | t->to_insert_watchpoint = inf_ttrace_insert_watchpoint; |
1307 | t->to_remove_watchpoint = inf_ttrace_remove_watchpoint; | |
1308 | t->to_stopped_by_watchpoint = inf_ttrace_stopped_by_watchpoint; | |
2a3cdf79 WZ |
1309 | t->to_region_ok_for_hw_watchpoint = |
1310 | inf_ttrace_region_ok_for_hw_watchpoint; | |
346e281c MK |
1311 | t->to_kill = inf_ttrace_kill; |
1312 | t->to_create_inferior = inf_ttrace_create_inferior; | |
1313 | t->to_follow_fork = inf_ttrace_follow_fork; | |
1314 | t->to_mourn_inferior = inf_ttrace_mourn_inferior; | |
1315 | t->to_thread_alive = inf_ttrace_thread_alive; | |
438ac09b | 1316 | t->to_extra_thread_info = inf_ttrace_extra_thread_info; |
346e281c MK |
1317 | t->to_pid_to_str = inf_ttrace_pid_to_str; |
1318 | t->to_xfer_partial = inf_ttrace_xfer_partial; | |
fa07e785 | 1319 | t->to_get_ada_task_ptid = inf_ttrace_get_ada_task_ptid; |
eee22bf8 | 1320 | |
eee22bf8 MK |
1321 | return t; |
1322 | } | |
d3322e8a | 1323 | #endif |
932936f0 MK |
1324 | \f |
1325 | ||
1326 | /* Prevent warning from -Wmissing-prototypes. */ | |
1327 | void _initialize_hppa_hpux_nat (void); | |
eee22bf8 | 1328 | |
932936f0 MK |
1329 | void |
1330 | _initialize_inf_ttrace (void) | |
1331 | { | |
d3322e8a | 1332 | #ifdef HAVE_TTRACE |
932936f0 | 1333 | inf_ttrace_page_dict.pagesize = getpagesize(); |
eee22bf8 | 1334 | #endif |
d3322e8a | 1335 | } |