1 /* Low-level child interface to ttrace.
3 Copyright (C) 2004-2014 Free Software Foundation, Inc.
5 This file is part of GDB.
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
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
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.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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. */
28 #include "gdbthread.h"
33 #include <sys/ttrace.h>
36 #include "inf-child.h"
37 #include "inf-ttrace.h"
38 #include "common/filestuff.h"
42 /* HP-UX uses a threading model where each user-space thread
43 corresponds to a kernel thread. These kernel threads are called
44 lwps. The ttrace(2) interface gives us almost full control over
45 the threads, which makes it very easy to support them in GDB. We
46 identify the threads by process ID and lwp ID. The ttrace(2) also
47 provides us with a thread's user ID (in the `tts_user_tid' member
48 of `ttstate_t') but we don't use that (yet) as it isn't necessary
49 to uniquely label the thread. */
51 /* Number of active lwps. */
52 static int inf_ttrace_num_lwps;
55 /* On HP-UX versions that have the ttrace(2) system call, we can
56 implement "hardware" watchpoints by fiddling with the protection of
57 pages in the address space that contain the variable being watched.
58 In order to implement this, we keep a dictionary of pages for which
59 we have changed the protection. */
61 struct inf_ttrace_page
63 CORE_ADDR addr; /* Page address. */
64 int prot; /* Protection. */
65 int refcount; /* Reference count. */
66 struct inf_ttrace_page *next;
67 struct inf_ttrace_page *prev;
70 struct inf_ttrace_page_dict
72 struct inf_ttrace_page buckets[128];
73 int pagesize; /* Page size. */
74 int count; /* Number of pages in this dictionary. */
75 } inf_ttrace_page_dict;
77 struct inf_ttrace_private_thread_info
82 /* Number of lwps that are currently in a system call. */
83 static int inf_ttrace_num_lwps_in_syscall;
85 /* Flag to indicate whether we should re-enable page protections after
87 static int inf_ttrace_reenable_page_protections;
89 /* Enable system call events for process PID. */
92 inf_ttrace_enable_syscall_events (pid_t pid)
97 gdb_assert (inf_ttrace_num_lwps_in_syscall == 0);
99 if (ttrace (TT_PROC_GET_EVENT_MASK, pid, 0,
100 (uintptr_t)&tte, sizeof tte, 0) == -1)
101 perror_with_name (("ttrace"));
103 tte.tte_events |= (TTEVT_SYSCALL_ENTRY | TTEVT_SYSCALL_RETURN);
105 if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0,
106 (uintptr_t)&tte, sizeof tte, 0) == -1)
107 perror_with_name (("ttrace"));
109 if (ttrace (TT_PROC_GET_FIRST_LWP_STATE, pid, 0,
110 (uintptr_t)&tts, sizeof tts, 0) == -1)
111 perror_with_name (("ttrace"));
113 if (tts.tts_flags & TTS_INSYSCALL)
114 inf_ttrace_num_lwps_in_syscall++;
116 /* FIXME: Handle multiple threads. */
119 /* Disable system call events for process PID. */
122 inf_ttrace_disable_syscall_events (pid_t pid)
126 gdb_assert (inf_ttrace_page_dict.count == 0);
128 if (ttrace (TT_PROC_GET_EVENT_MASK, pid, 0,
129 (uintptr_t)&tte, sizeof tte, 0) == -1)
130 perror_with_name (("ttrace"));
132 tte.tte_events &= ~(TTEVT_SYSCALL_ENTRY | TTEVT_SYSCALL_RETURN);
134 if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0,
135 (uintptr_t)&tte, sizeof tte, 0) == -1)
136 perror_with_name (("ttrace"));
138 inf_ttrace_num_lwps_in_syscall = 0;
141 /* Get information about the page at address ADDR for process PID from
144 static struct inf_ttrace_page *
145 inf_ttrace_get_page (pid_t pid, CORE_ADDR addr)
147 const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets);
148 const int pagesize = inf_ttrace_page_dict.pagesize;
150 struct inf_ttrace_page *page;
152 bucket = (addr / pagesize) % num_buckets;
153 page = &inf_ttrace_page_dict.buckets[bucket];
156 if (page->addr == addr)
165 /* Add the page at address ADDR for process PID to the dictionary. */
167 static struct inf_ttrace_page *
168 inf_ttrace_add_page (pid_t pid, CORE_ADDR addr)
170 const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets);
171 const int pagesize = inf_ttrace_page_dict.pagesize;
173 struct inf_ttrace_page *page;
174 struct inf_ttrace_page *prev = NULL;
176 bucket = (addr / pagesize) % num_buckets;
177 page = &inf_ttrace_page_dict.buckets[bucket];
180 if (page->addr == addr)
191 if (ttrace (TT_PROC_GET_MPROTECT, pid, 0,
192 addr, 0, (uintptr_t)&prot) == -1)
193 perror_with_name (("ttrace"));
195 page = XNEW (struct inf_ttrace_page);
204 inf_ttrace_page_dict.count++;
205 if (inf_ttrace_page_dict.count == 1)
206 inf_ttrace_enable_syscall_events (pid);
208 if (inf_ttrace_num_lwps_in_syscall == 0)
210 if (ttrace (TT_PROC_SET_MPROTECT, pid, 0,
211 addr, pagesize, prot & ~PROT_WRITE) == -1)
212 perror_with_name (("ttrace"));
219 /* Insert the page at address ADDR of process PID to the dictionary. */
222 inf_ttrace_insert_page (pid_t pid, CORE_ADDR addr)
224 struct inf_ttrace_page *page;
226 page = inf_ttrace_get_page (pid, addr);
228 page = inf_ttrace_add_page (pid, addr);
233 /* Remove the page at address ADDR of process PID from the dictionary. */
236 inf_ttrace_remove_page (pid_t pid, CORE_ADDR addr)
238 const int pagesize = inf_ttrace_page_dict.pagesize;
239 struct inf_ttrace_page *page;
241 page = inf_ttrace_get_page (pid, addr);
244 gdb_assert (page->refcount >= 0);
246 if (page->refcount == 0)
248 if (inf_ttrace_num_lwps_in_syscall == 0)
250 if (ttrace (TT_PROC_SET_MPROTECT, pid, 0,
251 addr, pagesize, page->prot) == -1)
252 perror_with_name (("ttrace"));
255 inf_ttrace_page_dict.count--;
256 if (inf_ttrace_page_dict.count == 0)
257 inf_ttrace_disable_syscall_events (pid);
259 page->prev->next = page->next;
261 page->next->prev = page->prev;
267 /* Mask the bits in PROT from the page protections that are currently
268 in the dictionary for process PID. */
271 inf_ttrace_mask_page_protections (pid_t pid, int prot)
273 const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets);
274 const int pagesize = inf_ttrace_page_dict.pagesize;
277 for (bucket = 0; bucket < num_buckets; bucket++)
279 struct inf_ttrace_page *page;
281 page = inf_ttrace_page_dict.buckets[bucket].next;
284 if (ttrace (TT_PROC_SET_MPROTECT, pid, 0,
285 page->addr, pagesize, page->prot & ~prot) == -1)
286 perror_with_name (("ttrace"));
293 /* Write-protect the pages in the dictionary for process PID. */
296 inf_ttrace_enable_page_protections (pid_t pid)
298 inf_ttrace_mask_page_protections (pid, PROT_WRITE);
301 /* Restore the protection of the pages in the dictionary for process
305 inf_ttrace_disable_page_protections (pid_t pid)
307 inf_ttrace_mask_page_protections (pid, 0);
310 /* Insert a "hardware" watchpoint for LEN bytes at address ADDR of
314 inf_ttrace_insert_watchpoint (struct target_ops *self,
315 CORE_ADDR addr, int len, int type,
316 struct expression *cond)
318 const int pagesize = inf_ttrace_page_dict.pagesize;
319 pid_t pid = ptid_get_pid (inferior_ptid);
324 gdb_assert (type == hw_write);
326 page_addr = (addr / pagesize) * pagesize;
327 num_pages = (len + pagesize - 1) / pagesize;
329 for (page = 0; page < num_pages; page++, page_addr += pagesize)
330 inf_ttrace_insert_page (pid, page_addr);
335 /* Remove a "hardware" watchpoint for LEN bytes at address ADDR of
339 inf_ttrace_remove_watchpoint (struct target_ops *self,
340 CORE_ADDR addr, int len, int type,
341 struct expression *cond)
343 const int pagesize = inf_ttrace_page_dict.pagesize;
344 pid_t pid = ptid_get_pid (inferior_ptid);
349 gdb_assert (type == hw_write);
351 page_addr = (addr / pagesize) * pagesize;
352 num_pages = (len + pagesize - 1) / pagesize;
354 for (page = 0; page < num_pages; page++, page_addr += pagesize)
355 inf_ttrace_remove_page (pid, page_addr);
361 inf_ttrace_can_use_hw_breakpoint (struct target_ops *self,
362 int type, int len, int ot)
364 return (type == bp_hardware_watchpoint);
368 inf_ttrace_region_ok_for_hw_watchpoint (struct target_ops *self,
369 CORE_ADDR addr, int len)
374 /* Return non-zero if the current inferior was (potentially) stopped
375 by hitting a "hardware" watchpoint. */
378 inf_ttrace_stopped_by_watchpoint (struct target_ops *ops)
380 pid_t pid = ptid_get_pid (inferior_ptid);
381 lwpid_t lwpid = ptid_get_lwp (inferior_ptid);
384 if (inf_ttrace_page_dict.count > 0)
386 if (ttrace (TT_LWP_GET_STATE, pid, lwpid,
387 (uintptr_t)&tts, sizeof tts, 0) == -1)
388 perror_with_name (("ttrace"));
390 if (tts.tts_event == TTEVT_SIGNAL
391 && tts.tts_u.tts_signal.tts_signo == SIGBUS)
393 const int pagesize = inf_ttrace_page_dict.pagesize;
394 void *addr = tts.tts_u.tts_signal.tts_siginfo.si_addr;
395 CORE_ADDR page_addr = ((uintptr_t)addr / pagesize) * pagesize;
397 if (inf_ttrace_get_page (pid, page_addr))
406 /* When tracking a vfork(2), we cannot detach from the parent until
407 after the child has called exec(3) or has exited. If we are still
408 attached to the parent, this variable will be set to the process ID
409 of the parent. Otherwise it will be set to zero. */
410 static pid_t inf_ttrace_vfork_ppid = -1;
413 inf_ttrace_follow_fork (struct target_ops *ops, int follow_child,
417 lwpid_t lwpid, flwpid;
419 struct thread_info *tp = inferior_thread ();
421 gdb_assert (tp->pending_follow.kind == TARGET_WAITKIND_FORKED
422 || tp->pending_follow.kind == TARGET_WAITKIND_VFORKED);
424 pid = ptid_get_pid (inferior_ptid);
425 lwpid = ptid_get_lwp (inferior_ptid);
427 /* Get all important details that core GDB doesn't (and shouldn't)
429 if (ttrace (TT_LWP_GET_STATE, pid, lwpid,
430 (uintptr_t)&tts, sizeof tts, 0) == -1)
431 perror_with_name (("ttrace"));
433 gdb_assert (tts.tts_event == TTEVT_FORK || tts.tts_event == TTEVT_VFORK);
435 if (tts.tts_u.tts_fork.tts_isparent)
438 lwpid = tts.tts_lwpid;
439 fpid = tts.tts_u.tts_fork.tts_fpid;
440 flwpid = tts.tts_u.tts_fork.tts_flwpid;
444 pid = tts.tts_u.tts_fork.tts_fpid;
445 lwpid = tts.tts_u.tts_fork.tts_flwpid;
447 flwpid = tts.tts_lwpid;
452 struct inferior *inf;
453 struct inferior *parent_inf;
455 parent_inf = find_inferior_pid (pid);
457 inferior_ptid = ptid_build (fpid, flwpid, 0);
458 inf = add_inferior (fpid);
459 inf->attach_flag = parent_inf->attach_flag;
460 inf->pspace = parent_inf->pspace;
461 inf->aspace = parent_inf->aspace;
462 copy_terminal_info (inf, parent_inf);
463 detach_breakpoints (ptid_build (pid, lwpid, 0));
465 target_terminal_ours ();
466 fprintf_unfiltered (gdb_stdlog,
467 _("Attaching after fork to child process %ld.\n"),
472 inferior_ptid = ptid_build (pid, lwpid, 0);
473 /* Detach any remaining breakpoints in the child. In the case
474 of fork events, we do not need to do this, because breakpoints
475 should have already been removed earlier. */
476 if (tts.tts_event == TTEVT_VFORK)
477 detach_breakpoints (ptid_build (fpid, flwpid, 0));
479 target_terminal_ours ();
480 fprintf_unfiltered (gdb_stdlog,
481 _("Detaching after fork from child process %ld.\n"),
485 if (tts.tts_event == TTEVT_VFORK)
487 gdb_assert (!tts.tts_u.tts_fork.tts_isparent);
491 /* We can't detach from the parent yet. */
492 inf_ttrace_vfork_ppid = pid;
494 reattach_breakpoints (fpid);
498 if (ttrace (TT_PROC_DETACH, fpid, 0, 0, 0, 0) == -1)
499 perror_with_name (("ttrace"));
501 /* Wait till we get the TTEVT_VFORK event in the parent.
502 This indicates that the child has called exec(3) or has
503 exited and that the parent is ready to be traced again. */
504 if (ttrace_wait (pid, lwpid, TTRACE_WAITOK, &tts, sizeof tts) == -1)
505 perror_with_name (("ttrace_wait"));
506 gdb_assert (tts.tts_event == TTEVT_VFORK);
507 gdb_assert (tts.tts_u.tts_fork.tts_isparent);
509 reattach_breakpoints (pid);
514 gdb_assert (tts.tts_u.tts_fork.tts_isparent);
518 if (ttrace (TT_PROC_DETACH, pid, 0, 0, 0, 0) == -1)
519 perror_with_name (("ttrace"));
523 if (ttrace (TT_PROC_DETACH, fpid, 0, 0, 0, 0) == -1)
524 perror_with_name (("ttrace"));
530 struct thread_info *ti;
532 /* The child will start out single-threaded. */
533 inf_ttrace_num_lwps = 1;
534 inf_ttrace_num_lwps_in_syscall = 0;
537 delete_thread_silent (ptid_build (pid, lwpid, 0));
538 detach_inferior (pid);
540 /* Add child thread. inferior_ptid was already set above. */
541 ti = add_thread_silent (inferior_ptid);
543 xmalloc (sizeof (struct inf_ttrace_private_thread_info));
544 memset (ti->private, 0,
545 sizeof (struct inf_ttrace_private_thread_info));
552 /* File descriptors for pipes used as semaphores during initial
553 startup of an inferior. */
554 static int inf_ttrace_pfd1[2];
555 static int inf_ttrace_pfd2[2];
558 do_cleanup_pfds (void *dummy)
560 close (inf_ttrace_pfd1[0]);
561 close (inf_ttrace_pfd1[1]);
562 close (inf_ttrace_pfd2[0]);
563 close (inf_ttrace_pfd2[1]);
565 unmark_fd_no_cloexec (inf_ttrace_pfd1[0]);
566 unmark_fd_no_cloexec (inf_ttrace_pfd1[1]);
567 unmark_fd_no_cloexec (inf_ttrace_pfd2[0]);
568 unmark_fd_no_cloexec (inf_ttrace_pfd2[1]);
572 inf_ttrace_prepare (void)
574 if (pipe (inf_ttrace_pfd1) == -1)
575 perror_with_name (("pipe"));
577 if (pipe (inf_ttrace_pfd2) == -1)
579 close (inf_ttrace_pfd1[0]);
580 close (inf_ttrace_pfd2[0]);
581 perror_with_name (("pipe"));
584 mark_fd_no_cloexec (inf_ttrace_pfd1[0]);
585 mark_fd_no_cloexec (inf_ttrace_pfd1[1]);
586 mark_fd_no_cloexec (inf_ttrace_pfd2[0]);
587 mark_fd_no_cloexec (inf_ttrace_pfd2[1]);
590 /* Prepare to be traced. */
595 struct cleanup *old_chain = make_cleanup (do_cleanup_pfds, 0);
598 /* "Trace me, Dr. Memory!" */
599 if (ttrace (TT_PROC_SETTRC, 0, 0, 0, TT_VERSION, 0) == -1)
600 perror_with_name (("ttrace"));
602 /* Tell our parent that we are ready to be traced. */
603 if (write (inf_ttrace_pfd1[1], &c, sizeof c) != sizeof c)
604 perror_with_name (("write"));
606 /* Wait until our parent has set the initial event mask. */
607 if (read (inf_ttrace_pfd2[0], &c, sizeof c) != sizeof c)
608 perror_with_name (("read"));
610 do_cleanups (old_chain);
613 /* Start tracing PID. */
616 inf_ttrace_him (struct target_ops *ops, int pid)
618 struct cleanup *old_chain = make_cleanup (do_cleanup_pfds, 0);
622 /* Wait until our child is ready to be traced. */
623 if (read (inf_ttrace_pfd1[0], &c, sizeof c) != sizeof c)
624 perror_with_name (("read"));
626 /* Set the initial event mask. */
627 memset (&tte, 0, sizeof (tte));
628 tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT | TTEVT_FORK | TTEVT_VFORK;
629 tte.tte_events |= TTEVT_LWP_CREATE | TTEVT_LWP_EXIT | TTEVT_LWP_TERMINATE;
630 #ifdef TTEVT_BPT_SSTEP
631 tte.tte_events |= TTEVT_BPT_SSTEP;
633 tte.tte_opts |= TTEO_PROC_INHERIT;
634 if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0,
635 (uintptr_t)&tte, sizeof tte, 0) == -1)
636 perror_with_name (("ttrace"));
638 /* Tell our child that we have set the initial event mask. */
639 if (write (inf_ttrace_pfd2[1], &c, sizeof c) != sizeof c)
640 perror_with_name (("write"));
642 do_cleanups (old_chain);
644 if (!target_is_pushed (ops))
647 startup_inferior (START_INFERIOR_TRAPS_EXPECTED);
649 /* On some targets, there must be some explicit actions taken after
650 the inferior has been started up. */
651 target_post_startup_inferior (pid_to_ptid (pid));
655 inf_ttrace_create_inferior (struct target_ops *ops, char *exec_file,
656 char *allargs, char **env, int from_tty)
660 gdb_assert (inf_ttrace_num_lwps == 0);
661 gdb_assert (inf_ttrace_num_lwps_in_syscall == 0);
662 gdb_assert (inf_ttrace_page_dict.count == 0);
663 gdb_assert (inf_ttrace_reenable_page_protections == 0);
664 gdb_assert (inf_ttrace_vfork_ppid == -1);
666 pid = fork_inferior (exec_file, allargs, env, inf_ttrace_me, NULL,
667 inf_ttrace_prepare, NULL, NULL);
669 inf_ttrace_him (ops, pid);
673 inf_ttrace_mourn_inferior (struct target_ops *ops)
675 const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets);
678 inf_ttrace_num_lwps = 0;
679 inf_ttrace_num_lwps_in_syscall = 0;
681 for (bucket = 0; bucket < num_buckets; bucket++)
683 struct inf_ttrace_page *page;
684 struct inf_ttrace_page *next;
686 page = inf_ttrace_page_dict.buckets[bucket].next;
694 inf_ttrace_page_dict.count = 0;
696 inf_child_mourn_inferior (ops);
699 /* Assuming we just attached the debugger to a new inferior, create
700 a new thread_info structure for each thread, and add it to our
704 inf_ttrace_create_threads_after_attach (int pid)
709 struct thread_info *ti;
711 status = ttrace (TT_PROC_GET_FIRST_LWP_STATE, pid, 0,
712 (uintptr_t) &tts, sizeof (ttstate_t), 0);
714 perror_with_name (_("TT_PROC_GET_FIRST_LWP_STATE ttrace call failed"));
715 gdb_assert (tts.tts_pid == pid);
717 /* Add the stopped thread. */
718 ptid = ptid_build (pid, tts.tts_lwpid, 0);
719 ti = add_thread (ptid);
720 ti->private = xzalloc (sizeof (struct inf_ttrace_private_thread_info));
721 inf_ttrace_num_lwps++;
723 /* We use the "first stopped thread" as the currently active thread. */
724 inferior_ptid = ptid;
726 /* Iterative over all the remaining threads. */
732 status = ttrace (TT_PROC_GET_NEXT_LWP_STATE, pid, 0,
733 (uintptr_t) &tts, sizeof (ttstate_t), 0);
735 perror_with_name (_("TT_PROC_GET_NEXT_LWP_STATE ttrace call failed"));
737 break; /* End of list. */
739 ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0);
740 ti = add_thread (ptid);
741 ti->private = xzalloc (sizeof (struct inf_ttrace_private_thread_info));
742 inf_ttrace_num_lwps++;
747 inf_ttrace_attach (struct target_ops *ops, const char *args, int from_tty)
752 struct inferior *inf;
754 pid = parse_pid_to_attach (args);
756 if (pid == getpid ()) /* Trying to masturbate? */
757 error (_("I refuse to debug myself!"));
761 exec_file = get_exec_file (0);
764 printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file,
765 target_pid_to_str (pid_to_ptid (pid)));
767 printf_unfiltered (_("Attaching to %s\n"),
768 target_pid_to_str (pid_to_ptid (pid)));
770 gdb_flush (gdb_stdout);
773 gdb_assert (inf_ttrace_num_lwps == 0);
774 gdb_assert (inf_ttrace_num_lwps_in_syscall == 0);
775 gdb_assert (inf_ttrace_vfork_ppid == -1);
777 if (ttrace (TT_PROC_ATTACH, pid, 0, TT_KILL_ON_EXIT, TT_VERSION, 0) == -1)
778 perror_with_name (("ttrace"));
780 inf = current_inferior ();
781 inferior_appeared (inf, pid);
782 inf->attach_flag = 1;
784 /* Set the initial event mask. */
785 memset (&tte, 0, sizeof (tte));
786 tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT | TTEVT_FORK | TTEVT_VFORK;
787 tte.tte_events |= TTEVT_LWP_CREATE | TTEVT_LWP_EXIT | TTEVT_LWP_TERMINATE;
788 #ifdef TTEVT_BPT_SSTEP
789 tte.tte_events |= TTEVT_BPT_SSTEP;
791 tte.tte_opts |= TTEO_PROC_INHERIT;
792 if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0,
793 (uintptr_t)&tte, sizeof tte, 0) == -1)
794 perror_with_name (("ttrace"));
796 if (!target_is_pushed (ops))
799 inf_ttrace_create_threads_after_attach (pid);
803 inf_ttrace_detach (struct target_ops *ops, const char *args, int from_tty)
805 pid_t pid = ptid_get_pid (inferior_ptid);
810 char *exec_file = get_exec_file (0);
813 printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file,
814 target_pid_to_str (pid_to_ptid (pid)));
815 gdb_flush (gdb_stdout);
820 /* ??? The HP-UX 11.0 ttrace(2) manual page doesn't mention that we
821 can pass a signal number here. Does this really work? */
822 if (ttrace (TT_PROC_DETACH, pid, 0, 0, sig, 0) == -1)
823 perror_with_name (("ttrace"));
825 if (inf_ttrace_vfork_ppid != -1)
827 if (ttrace (TT_PROC_DETACH, inf_ttrace_vfork_ppid, 0, 0, 0, 0) == -1)
828 perror_with_name (("ttrace"));
829 inf_ttrace_vfork_ppid = -1;
832 inf_ttrace_num_lwps = 0;
833 inf_ttrace_num_lwps_in_syscall = 0;
835 inferior_ptid = null_ptid;
836 detach_inferior (pid);
838 inf_child_maybe_unpush_target (ops);
842 inf_ttrace_kill (struct target_ops *ops)
844 pid_t pid = ptid_get_pid (inferior_ptid);
849 if (ttrace (TT_PROC_EXIT, pid, 0, 0, 0, 0) == -1)
850 perror_with_name (("ttrace"));
851 /* ??? Is it necessary to call ttrace_wait() here? */
853 if (inf_ttrace_vfork_ppid != -1)
855 if (ttrace (TT_PROC_DETACH, inf_ttrace_vfork_ppid, 0, 0, 0, 0) == -1)
856 perror_with_name (("ttrace"));
857 inf_ttrace_vfork_ppid = -1;
860 target_mourn_inferior ();
863 /* Check is a dying thread is dead by now, and delete it from GDBs
864 thread list if so. */
866 inf_ttrace_delete_dead_threads_callback (struct thread_info *info, void *arg)
869 struct inf_ttrace_private_thread_info *p;
871 if (is_exited (info->ptid))
874 lwpid = ptid_get_lwp (info->ptid);
875 p = (struct inf_ttrace_private_thread_info *) info->private;
877 /* Check if an lwp that was dying is still there or not. */
878 if (p->dying && (kill (lwpid, 0) == -1))
880 delete_thread (info->ptid);
885 /* Resume the lwp pointed to by INFO, with REQUEST, and pass it signal
889 inf_ttrace_resume_lwp (struct thread_info *info, ttreq_t request, int sig)
891 pid_t pid = ptid_get_pid (info->ptid);
892 lwpid_t lwpid = ptid_get_lwp (info->ptid);
894 if (ttrace (request, pid, lwpid, TT_NOPC, sig, 0) == -1)
896 struct inf_ttrace_private_thread_info *p
897 = (struct inf_ttrace_private_thread_info *) info->private;
898 if (p->dying && errno == EPROTO)
899 /* This is expected, it means the dying lwp is really gone
900 by now. If ttrace had an event to inform the debugger
901 the lwp is really gone, this wouldn't be needed. */
902 delete_thread (info->ptid);
904 /* This was really unexpected. */
905 perror_with_name (("ttrace"));
909 /* Callback for iterate_over_threads. */
912 inf_ttrace_resume_callback (struct thread_info *info, void *arg)
914 if (!ptid_equal (info->ptid, inferior_ptid) && !is_exited (info->ptid))
915 inf_ttrace_resume_lwp (info, TT_LWP_CONTINUE, 0);
921 inf_ttrace_resume (struct target_ops *ops,
922 ptid_t ptid, int step, enum gdb_signal signal)
925 ttreq_t request = step ? TT_LWP_SINGLE : TT_LWP_CONTINUE;
926 int sig = gdb_signal_to_host (signal);
927 struct thread_info *info;
929 /* A specific PTID means `step only this process id'. */
930 resume_all = (ptid_equal (ptid, minus_one_ptid));
932 /* If resuming all threads, it's the current thread that should be
933 handled specially. */
935 ptid = inferior_ptid;
937 info = find_thread_ptid (ptid);
938 inf_ttrace_resume_lwp (info, request, sig);
941 /* Let all the other threads run too. */
942 iterate_over_threads (inf_ttrace_resume_callback, NULL);
946 inf_ttrace_wait (struct target_ops *ops,
947 ptid_t ptid, struct target_waitstatus *ourstatus, int options)
949 pid_t pid = ptid_get_pid (ptid);
950 lwpid_t lwpid = ptid_get_lwp (ptid);
952 struct thread_info *ti;
955 /* Until proven otherwise. */
956 ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
961 gdb_assert (pid != 0 || lwpid == 0);
967 if (ttrace_wait (pid, lwpid, TTRACE_WAITOK, &tts, sizeof tts) == -1)
968 perror_with_name (("ttrace_wait"));
970 if (tts.tts_event == TTEVT_VFORK && tts.tts_u.tts_fork.tts_isparent)
972 if (inf_ttrace_vfork_ppid != -1)
974 gdb_assert (inf_ttrace_vfork_ppid == tts.tts_pid);
976 if (ttrace (TT_PROC_DETACH, tts.tts_pid, 0, 0, 0, 0) == -1)
977 perror_with_name (("ttrace"));
978 inf_ttrace_vfork_ppid = -1;
981 tts.tts_event = TTEVT_NONE;
984 clear_sigint_trap ();
986 while (tts.tts_event == TTEVT_NONE);
988 /* Now that we've waited, we can re-enable the page protections. */
989 if (inf_ttrace_reenable_page_protections)
991 gdb_assert (inf_ttrace_num_lwps_in_syscall == 0);
992 inf_ttrace_enable_page_protections (tts.tts_pid);
993 inf_ttrace_reenable_page_protections = 0;
996 ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0);
998 if (inf_ttrace_num_lwps == 0)
1000 struct thread_info *ti;
1002 inf_ttrace_num_lwps = 1;
1004 /* This is the earliest we hear about the lwp member of
1005 INFERIOR_PTID, after an attach or fork_inferior. */
1006 gdb_assert (ptid_get_lwp (inferior_ptid) == 0);
1008 /* We haven't set the private member on the main thread yet. Do
1010 ti = find_thread_ptid (inferior_ptid);
1011 gdb_assert (ti != NULL && ti->private == NULL);
1013 xmalloc (sizeof (struct inf_ttrace_private_thread_info));
1014 memset (ti->private, 0,
1015 sizeof (struct inf_ttrace_private_thread_info));
1017 /* Notify the core that this ptid changed. This changes
1018 inferior_ptid as well. */
1019 thread_change_ptid (inferior_ptid, ptid);
1022 switch (tts.tts_event)
1024 #ifdef TTEVT_BPT_SSTEP
1025 case TTEVT_BPT_SSTEP:
1026 /* Make it look like a breakpoint. */
1027 ourstatus->kind = TARGET_WAITKIND_STOPPED;
1028 ourstatus->value.sig = GDB_SIGNAL_TRAP;
1033 ourstatus->kind = TARGET_WAITKIND_EXECD;
1034 ourstatus->value.execd_pathname =
1035 xmalloc (tts.tts_u.tts_exec.tts_pathlen + 1);
1036 if (ttrace (TT_PROC_GET_PATHNAME, tts.tts_pid, 0,
1037 (uintptr_t)ourstatus->value.execd_pathname,
1038 tts.tts_u.tts_exec.tts_pathlen, 0) == -1)
1039 perror_with_name (("ttrace"));
1040 ourstatus->value.execd_pathname[tts.tts_u.tts_exec.tts_pathlen] = 0;
1042 /* At this point, all inserted breakpoints are gone. Doing this
1043 as soon as we detect an exec prevents the badness of deleting
1044 a breakpoint writing the current "shadow contents" to lift
1045 the bp. That shadow is NOT valid after an exec. */
1046 mark_breakpoints_out ();
1050 store_waitstatus (ourstatus, tts.tts_u.tts_exit.tts_exitcode);
1051 inf_ttrace_num_lwps = 0;
1055 related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid,
1056 tts.tts_u.tts_fork.tts_flwpid, 0);
1058 ourstatus->kind = TARGET_WAITKIND_FORKED;
1059 ourstatus->value.related_pid = related_ptid;
1061 /* Make sure the other end of the fork is stopped too. */
1062 if (ttrace_wait (tts.tts_u.tts_fork.tts_fpid,
1063 tts.tts_u.tts_fork.tts_flwpid,
1064 TTRACE_WAITOK, &tts, sizeof tts) == -1)
1065 perror_with_name (("ttrace_wait"));
1067 gdb_assert (tts.tts_event == TTEVT_FORK);
1068 if (tts.tts_u.tts_fork.tts_isparent)
1070 related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid,
1071 tts.tts_u.tts_fork.tts_flwpid, 0);
1072 ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0);
1073 ourstatus->value.related_pid = related_ptid;
1078 gdb_assert (!tts.tts_u.tts_fork.tts_isparent);
1080 related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid,
1081 tts.tts_u.tts_fork.tts_flwpid, 0);
1083 ourstatus->kind = TARGET_WAITKIND_VFORKED;
1084 ourstatus->value.related_pid = related_ptid;
1086 /* HACK: To avoid touching the parent during the vfork, switch
1088 inferior_ptid = ptid;
1091 case TTEVT_LWP_CREATE:
1092 lwpid = tts.tts_u.tts_thread.tts_target_lwpid;
1093 ptid = ptid_build (tts.tts_pid, lwpid, 0);
1094 ti = add_thread (ptid);
1096 xmalloc (sizeof (struct inf_ttrace_private_thread_info));
1097 memset (ti->private, 0,
1098 sizeof (struct inf_ttrace_private_thread_info));
1099 inf_ttrace_num_lwps++;
1100 ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0);
1101 /* Let the lwp_create-caller thread continue. */
1102 ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid),
1103 ptid_get_lwp (ptid), TT_NOPC, 0, 0);
1104 /* Return without stopping the whole process. */
1105 ourstatus->kind = TARGET_WAITKIND_IGNORE;
1108 case TTEVT_LWP_EXIT:
1109 if (print_thread_events)
1110 printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (ptid));
1111 ti = find_thread_ptid (ptid);
1112 gdb_assert (ti != NULL);
1113 ((struct inf_ttrace_private_thread_info *)ti->private)->dying = 1;
1114 inf_ttrace_num_lwps--;
1115 /* Let the thread really exit. */
1116 ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid),
1117 ptid_get_lwp (ptid), TT_NOPC, 0, 0);
1118 /* Return without stopping the whole process. */
1119 ourstatus->kind = TARGET_WAITKIND_IGNORE;
1122 case TTEVT_LWP_TERMINATE:
1123 lwpid = tts.tts_u.tts_thread.tts_target_lwpid;
1124 ptid = ptid_build (tts.tts_pid, lwpid, 0);
1125 if (print_thread_events)
1126 printf_unfiltered(_("[%s has been terminated]\n"),
1127 target_pid_to_str (ptid));
1128 ti = find_thread_ptid (ptid);
1129 gdb_assert (ti != NULL);
1130 ((struct inf_ttrace_private_thread_info *)ti->private)->dying = 1;
1131 inf_ttrace_num_lwps--;
1133 /* Resume the lwp_terminate-caller thread. */
1134 ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0);
1135 ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid),
1136 ptid_get_lwp (ptid), TT_NOPC, 0, 0);
1137 /* Return without stopping the whole process. */
1138 ourstatus->kind = TARGET_WAITKIND_IGNORE;
1142 ourstatus->kind = TARGET_WAITKIND_STOPPED;
1143 ourstatus->value.sig =
1144 gdb_signal_from_host (tts.tts_u.tts_signal.tts_signo);
1147 case TTEVT_SYSCALL_ENTRY:
1148 gdb_assert (inf_ttrace_reenable_page_protections == 0);
1149 inf_ttrace_num_lwps_in_syscall++;
1150 if (inf_ttrace_num_lwps_in_syscall == 1)
1152 /* A thread has just entered a system call. Disable any
1153 page protections as the kernel can't deal with them. */
1154 inf_ttrace_disable_page_protections (tts.tts_pid);
1156 ourstatus->kind = TARGET_WAITKIND_SYSCALL_ENTRY;
1157 ourstatus->value.syscall_number = tts.tts_scno;
1160 case TTEVT_SYSCALL_RETURN:
1161 if (inf_ttrace_num_lwps_in_syscall > 0)
1163 /* If the last thread has just left the system call, this
1164 would be a logical place to re-enable the page
1165 protections, but that doesn't work. We can't re-enable
1166 them until we've done another wait. */
1167 inf_ttrace_reenable_page_protections =
1168 (inf_ttrace_num_lwps_in_syscall == 1);
1169 inf_ttrace_num_lwps_in_syscall--;
1171 ourstatus->kind = TARGET_WAITKIND_SYSCALL_RETURN;
1172 ourstatus->value.syscall_number = tts.tts_scno;
1176 gdb_assert (!"Unexpected ttrace event");
1180 /* Make sure all threads within the process are stopped. */
1181 if (ttrace (TT_PROC_STOP, tts.tts_pid, 0, 0, 0, 0) == -1)
1182 perror_with_name (("ttrace"));
1184 /* Now that the whole process is stopped, check if any dying thread
1185 is really dead by now. If a dying thread is still alive, it will
1186 be stopped too, and will still show up in `info threads', tagged
1187 with "(Exiting)". We could make `info threads' prune dead
1188 threads instead via inf_ttrace_thread_alive, but doing this here
1189 has the advantage that a frontend is notificed sooner of thread
1190 exits. Note that a dying lwp is still alive, it still has to be
1191 resumed, like any other lwp. */
1192 iterate_over_threads (inf_ttrace_delete_dead_threads_callback, NULL);
1197 /* Transfer LEN bytes from ADDR in the inferior's memory into READBUF,
1198 and transfer LEN bytes from WRITEBUF into the inferior's memory at
1199 ADDR. Either READBUF or WRITEBUF may be null, in which case the
1200 corresponding transfer doesn't happen. Return the number of bytes
1201 actually transferred (which may be zero if an error occurs). */
1204 inf_ttrace_xfer_memory (CORE_ADDR addr, ULONGEST len,
1205 void *readbuf, const void *writebuf)
1207 pid_t pid = ptid_get_pid (inferior_ptid);
1209 /* HP-UX treats text space and data space differently. GDB however,
1210 doesn't really know the difference. Therefore we try both. Try
1211 text space before data space though because when we're writing
1212 into text space the instruction cache might need to be flushed. */
1215 && ttrace (TT_PROC_RDTEXT, pid, 0, addr, len, (uintptr_t)readbuf) == -1
1216 && ttrace (TT_PROC_RDDATA, pid, 0, addr, len, (uintptr_t)readbuf) == -1)
1220 && ttrace (TT_PROC_WRTEXT, pid, 0, addr, len, (uintptr_t)writebuf) == -1
1221 && ttrace (TT_PROC_WRDATA, pid, 0, addr, len, (uintptr_t)writebuf) == -1)
1227 static enum target_xfer_status
1228 inf_ttrace_xfer_partial (struct target_ops *ops, enum target_object object,
1229 const char *annex, gdb_byte *readbuf,
1230 const gdb_byte *writebuf,
1231 ULONGEST offset, ULONGEST len, ULONGEST *xfered_len)
1235 case TARGET_OBJECT_MEMORY:
1237 LONGEST val = inf_ttrace_xfer_memory (offset, len, readbuf, writebuf);
1240 return TARGET_XFER_EOF;
1243 *xfered_len = (ULONGEST) val;
1244 return TARGET_XFER_OK;
1248 case TARGET_OBJECT_UNWIND_TABLE:
1249 return TARGET_XFER_E_IO;
1251 case TARGET_OBJECT_AUXV:
1252 return TARGET_XFER_E_IO;
1254 case TARGET_OBJECT_WCOOKIE:
1255 return TARGET_XFER_E_IO;
1258 return TARGET_XFER_E_IO;
1262 /* Print status information about what we're accessing. */
1265 inf_ttrace_files_info (struct target_ops *ignore)
1267 struct inferior *inf = current_inferior ();
1268 printf_filtered (_("\tUsing the running image of %s %s.\n"),
1269 inf->attach_flag ? "attached" : "child",
1270 target_pid_to_str (inferior_ptid));
1274 inf_ttrace_thread_alive (struct target_ops *ops, ptid_t ptid)
1279 /* Return a string describing the state of the thread specified by
1283 inf_ttrace_extra_thread_info (struct target_ops *self,
1284 struct thread_info *info)
1286 struct inf_ttrace_private_thread_info* private =
1287 (struct inf_ttrace_private_thread_info *) info->private;
1289 if (private != NULL && private->dying)
1296 inf_ttrace_pid_to_str (struct target_ops *ops, ptid_t ptid)
1298 pid_t pid = ptid_get_pid (ptid);
1299 lwpid_t lwpid = ptid_get_lwp (ptid);
1300 static char buf[128];
1303 xsnprintf (buf, sizeof buf, "process %ld",
1306 xsnprintf (buf, sizeof buf, "process %ld, lwp %ld",
1307 (long) pid, (long) lwpid);
1312 /* Implement the get_ada_task_ptid target_ops method. */
1315 inf_ttrace_get_ada_task_ptid (struct target_ops *self, long lwp, long thread)
1317 return ptid_build (ptid_get_pid (inferior_ptid), lwp, 0);
1322 inf_ttrace_target (void)
1324 struct target_ops *t = inf_child_target ();
1326 t->to_attach = inf_ttrace_attach;
1327 t->to_detach = inf_ttrace_detach;
1328 t->to_resume = inf_ttrace_resume;
1329 t->to_wait = inf_ttrace_wait;
1330 t->to_files_info = inf_ttrace_files_info;
1331 t->to_can_use_hw_breakpoint = inf_ttrace_can_use_hw_breakpoint;
1332 t->to_insert_watchpoint = inf_ttrace_insert_watchpoint;
1333 t->to_remove_watchpoint = inf_ttrace_remove_watchpoint;
1334 t->to_stopped_by_watchpoint = inf_ttrace_stopped_by_watchpoint;
1335 t->to_region_ok_for_hw_watchpoint =
1336 inf_ttrace_region_ok_for_hw_watchpoint;
1337 t->to_kill = inf_ttrace_kill;
1338 t->to_create_inferior = inf_ttrace_create_inferior;
1339 t->to_follow_fork = inf_ttrace_follow_fork;
1340 t->to_mourn_inferior = inf_ttrace_mourn_inferior;
1341 t->to_thread_alive = inf_ttrace_thread_alive;
1342 t->to_extra_thread_info = inf_ttrace_extra_thread_info;
1343 t->to_pid_to_str = inf_ttrace_pid_to_str;
1344 t->to_xfer_partial = inf_ttrace_xfer_partial;
1345 t->to_get_ada_task_ptid = inf_ttrace_get_ada_task_ptid;
1352 /* Prevent warning from -Wmissing-prototypes. */
1353 void _initialize_inf_ttrace (void);
1356 _initialize_inf_ttrace (void)
1359 inf_ttrace_page_dict.pagesize = getpagesize();