1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2016 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "linux-low.h"
21 #include "nat/linux-osdata.h"
25 #include "signals-state-save-restore.h"
26 #include "nat/linux-nat.h"
27 #include "nat/linux-waitpid.h"
29 #include "nat/gdb_ptrace.h"
30 #include "nat/linux-ptrace.h"
31 #include "nat/linux-procfs.h"
32 #include "nat/linux-personality.h"
34 #include <sys/ioctl.h>
37 #include <sys/syscall.h>
41 #include <sys/types.h>
46 #include "filestuff.h"
47 #include "tracepoint.h"
51 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
52 then ELFMAG0 will have been defined. If it didn't get included by
53 gdb_proc_service.h then including it will likely introduce a duplicate
54 definition of elf_fpregset_t. */
57 #include "nat/linux-namespaces.h"
60 #define SPUFS_MAGIC 0x23c9b64e
63 #ifdef HAVE_PERSONALITY
64 # include <sys/personality.h>
65 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
66 # define ADDR_NO_RANDOMIZE 0x0040000
74 /* Some targets did not define these ptrace constants from the start,
75 so gdbserver defines them locally here. In the future, these may
76 be removed after they are added to asm/ptrace.h. */
77 #if !(defined(PT_TEXT_ADDR) \
78 || defined(PT_DATA_ADDR) \
79 || defined(PT_TEXT_END_ADDR))
80 #if defined(__mcoldfire__)
81 /* These are still undefined in 3.10 kernels. */
82 #define PT_TEXT_ADDR 49*4
83 #define PT_DATA_ADDR 50*4
84 #define PT_TEXT_END_ADDR 51*4
85 /* BFIN already defines these since at least 2.6.32 kernels. */
87 #define PT_TEXT_ADDR 220
88 #define PT_TEXT_END_ADDR 224
89 #define PT_DATA_ADDR 228
90 /* These are still undefined in 3.10 kernels. */
91 #elif defined(__TMS320C6X__)
92 #define PT_TEXT_ADDR (0x10000*4)
93 #define PT_DATA_ADDR (0x10004*4)
94 #define PT_TEXT_END_ADDR (0x10008*4)
98 #ifdef HAVE_LINUX_BTRACE
99 # include "nat/linux-btrace.h"
100 # include "btrace-common.h"
103 #ifndef HAVE_ELF32_AUXV_T
104 /* Copied from glibc's elf.h. */
107 uint32_t a_type
; /* Entry type */
110 uint32_t a_val
; /* Integer value */
111 /* We use to have pointer elements added here. We cannot do that,
112 though, since it does not work when using 32-bit definitions
113 on 64-bit platforms and vice versa. */
118 #ifndef HAVE_ELF64_AUXV_T
119 /* Copied from glibc's elf.h. */
122 uint64_t a_type
; /* Entry type */
125 uint64_t a_val
; /* Integer value */
126 /* We use to have pointer elements added here. We cannot do that,
127 though, since it does not work when using 32-bit definitions
128 on 64-bit platforms and vice versa. */
133 /* Does the current host support PTRACE_GETREGSET? */
134 int have_ptrace_getregset
= -1;
138 /* See nat/linux-nat.h. */
141 ptid_of_lwp (struct lwp_info
*lwp
)
143 return ptid_of (get_lwp_thread (lwp
));
146 /* See nat/linux-nat.h. */
149 lwp_set_arch_private_info (struct lwp_info
*lwp
,
150 struct arch_lwp_info
*info
)
152 lwp
->arch_private
= info
;
155 /* See nat/linux-nat.h. */
157 struct arch_lwp_info
*
158 lwp_arch_private_info (struct lwp_info
*lwp
)
160 return lwp
->arch_private
;
163 /* See nat/linux-nat.h. */
166 lwp_is_stopped (struct lwp_info
*lwp
)
171 /* See nat/linux-nat.h. */
173 enum target_stop_reason
174 lwp_stop_reason (struct lwp_info
*lwp
)
176 return lwp
->stop_reason
;
179 /* See nat/linux-nat.h. */
182 lwp_is_stepping (struct lwp_info
*lwp
)
184 return lwp
->stepping
;
187 /* A list of all unknown processes which receive stop signals. Some
188 other process will presumably claim each of these as forked
189 children momentarily. */
191 struct simple_pid_list
193 /* The process ID. */
196 /* The status as reported by waitpid. */
200 struct simple_pid_list
*next
;
202 struct simple_pid_list
*stopped_pids
;
204 /* Trivial list manipulation functions to keep track of a list of new
205 stopped processes. */
208 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
210 struct simple_pid_list
*new_pid
= XNEW (struct simple_pid_list
);
213 new_pid
->status
= status
;
214 new_pid
->next
= *listp
;
219 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
221 struct simple_pid_list
**p
;
223 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
224 if ((*p
)->pid
== pid
)
226 struct simple_pid_list
*next
= (*p
)->next
;
228 *statusp
= (*p
)->status
;
236 enum stopping_threads_kind
238 /* Not stopping threads presently. */
239 NOT_STOPPING_THREADS
,
241 /* Stopping threads. */
244 /* Stopping and suspending threads. */
245 STOPPING_AND_SUSPENDING_THREADS
248 /* This is set while stop_all_lwps is in effect. */
249 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
251 /* FIXME make into a target method? */
252 int using_threads
= 1;
254 /* True if we're presently stabilizing threads (moving them out of
256 static int stabilizing_threads
;
258 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
259 int step
, int signal
, siginfo_t
*info
);
260 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
261 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
262 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
263 static void unsuspend_all_lwps (struct lwp_info
*except
);
264 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
265 int *wstat
, int options
);
266 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
267 static struct lwp_info
*add_lwp (ptid_t ptid
);
268 static void linux_mourn (struct process_info
*process
);
269 static int linux_stopped_by_watchpoint (void);
270 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
271 static int lwp_is_marked_dead (struct lwp_info
*lwp
);
272 static void proceed_all_lwps (void);
273 static int finish_step_over (struct lwp_info
*lwp
);
274 static int kill_lwp (unsigned long lwpid
, int signo
);
275 static void enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
);
276 static void complete_ongoing_step_over (void);
277 static int linux_low_ptrace_options (int attached
);
278 static int check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
);
279 static int proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
);
281 /* When the event-loop is doing a step-over, this points at the thread
283 ptid_t step_over_bkpt
;
285 /* True if the low target can hardware single-step. */
288 can_hardware_single_step (void)
290 if (the_low_target
.supports_hardware_single_step
!= NULL
)
291 return the_low_target
.supports_hardware_single_step ();
296 /* True if the low target can software single-step. Such targets
297 implement the GET_NEXT_PCS callback. */
300 can_software_single_step (void)
302 return (the_low_target
.get_next_pcs
!= NULL
);
305 /* True if the low target supports memory breakpoints. If so, we'll
306 have a GET_PC implementation. */
309 supports_breakpoints (void)
311 return (the_low_target
.get_pc
!= NULL
);
314 /* Returns true if this target can support fast tracepoints. This
315 does not mean that the in-process agent has been loaded in the
319 supports_fast_tracepoints (void)
321 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
324 /* True if LWP is stopped in its stepping range. */
327 lwp_in_step_range (struct lwp_info
*lwp
)
329 CORE_ADDR pc
= lwp
->stop_pc
;
331 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
334 struct pending_signals
338 struct pending_signals
*prev
;
341 /* The read/write ends of the pipe registered as waitable file in the
343 static int linux_event_pipe
[2] = { -1, -1 };
345 /* True if we're currently in async mode. */
346 #define target_is_async_p() (linux_event_pipe[0] != -1)
348 static void send_sigstop (struct lwp_info
*lwp
);
349 static void wait_for_sigstop (void);
351 /* Return non-zero if HEADER is a 64-bit ELF file. */
354 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
356 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
357 && header
->e_ident
[EI_MAG1
] == ELFMAG1
358 && header
->e_ident
[EI_MAG2
] == ELFMAG2
359 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
361 *machine
= header
->e_machine
;
362 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
369 /* Return non-zero if FILE is a 64-bit ELF file,
370 zero if the file is not a 64-bit ELF file,
371 and -1 if the file is not accessible or doesn't exist. */
374 elf_64_file_p (const char *file
, unsigned int *machine
)
379 fd
= open (file
, O_RDONLY
);
383 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
390 return elf_64_header_p (&header
, machine
);
393 /* Accepts an integer PID; Returns true if the executable PID is
394 running is a 64-bit ELF file.. */
397 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
401 sprintf (file
, "/proc/%d/exe", pid
);
402 return elf_64_file_p (file
, machine
);
406 delete_lwp (struct lwp_info
*lwp
)
408 struct thread_info
*thr
= get_lwp_thread (lwp
);
411 debug_printf ("deleting %ld\n", lwpid_of (thr
));
414 free (lwp
->arch_private
);
418 /* Add a process to the common process list, and set its private
421 static struct process_info
*
422 linux_add_process (int pid
, int attached
)
424 struct process_info
*proc
;
426 proc
= add_process (pid
, attached
);
427 proc
->priv
= XCNEW (struct process_info_private
);
429 if (the_low_target
.new_process
!= NULL
)
430 proc
->priv
->arch_private
= the_low_target
.new_process ();
435 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
437 /* Call the target arch_setup function on the current thread. */
440 linux_arch_setup (void)
442 the_low_target
.arch_setup ();
445 /* Call the target arch_setup function on THREAD. */
448 linux_arch_setup_thread (struct thread_info
*thread
)
450 struct thread_info
*saved_thread
;
452 saved_thread
= current_thread
;
453 current_thread
= thread
;
457 current_thread
= saved_thread
;
460 /* Handle a GNU/Linux extended wait response. If we see a clone,
461 fork, or vfork event, we need to add the new LWP to our list
462 (and return 0 so as not to report the trap to higher layers).
463 If we see an exec event, we will modify ORIG_EVENT_LWP to point
464 to a new LWP representing the new program. */
467 handle_extended_wait (struct lwp_info
**orig_event_lwp
, int wstat
)
469 struct lwp_info
*event_lwp
= *orig_event_lwp
;
470 int event
= linux_ptrace_get_extended_event (wstat
);
471 struct thread_info
*event_thr
= get_lwp_thread (event_lwp
);
472 struct lwp_info
*new_lwp
;
474 gdb_assert (event_lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
476 /* All extended events we currently use are mid-syscall. Only
477 PTRACE_EVENT_STOP is delivered more like a signal-stop, but
478 you have to be using PTRACE_SEIZE to get that. */
479 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
481 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
482 || (event
== PTRACE_EVENT_CLONE
))
485 unsigned long new_pid
;
488 /* Get the pid of the new lwp. */
489 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
492 /* If we haven't already seen the new PID stop, wait for it now. */
493 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
495 /* The new child has a pending SIGSTOP. We can't affect it until it
496 hits the SIGSTOP, but we're already attached. */
498 ret
= my_waitpid (new_pid
, &status
, __WALL
);
501 perror_with_name ("waiting for new child");
502 else if (ret
!= new_pid
)
503 warning ("wait returned unexpected PID %d", ret
);
504 else if (!WIFSTOPPED (status
))
505 warning ("wait returned unexpected status 0x%x", status
);
508 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
510 struct process_info
*parent_proc
;
511 struct process_info
*child_proc
;
512 struct lwp_info
*child_lwp
;
513 struct thread_info
*child_thr
;
514 struct target_desc
*tdesc
;
516 ptid
= ptid_build (new_pid
, new_pid
, 0);
520 debug_printf ("HEW: Got fork event from LWP %ld, "
522 ptid_get_lwp (ptid_of (event_thr
)),
523 ptid_get_pid (ptid
));
526 /* Add the new process to the tables and clone the breakpoint
527 lists of the parent. We need to do this even if the new process
528 will be detached, since we will need the process object and the
529 breakpoints to remove any breakpoints from memory when we
530 detach, and the client side will access registers. */
531 child_proc
= linux_add_process (new_pid
, 0);
532 gdb_assert (child_proc
!= NULL
);
533 child_lwp
= add_lwp (ptid
);
534 gdb_assert (child_lwp
!= NULL
);
535 child_lwp
->stopped
= 1;
536 child_lwp
->must_set_ptrace_flags
= 1;
537 child_lwp
->status_pending_p
= 0;
538 child_thr
= get_lwp_thread (child_lwp
);
539 child_thr
->last_resume_kind
= resume_stop
;
540 child_thr
->last_status
.kind
= TARGET_WAITKIND_STOPPED
;
542 /* If we're suspending all threads, leave this one suspended
543 too. If the fork/clone parent is stepping over a breakpoint,
544 all other threads have been suspended already. Leave the
545 child suspended too. */
546 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
547 || event_lwp
->bp_reinsert
!= 0)
550 debug_printf ("HEW: leaving child suspended\n");
551 child_lwp
->suspended
= 1;
554 parent_proc
= get_thread_process (event_thr
);
555 child_proc
->attached
= parent_proc
->attached
;
557 if (event_lwp
->bp_reinsert
!= 0
558 && can_software_single_step ()
559 && event
== PTRACE_EVENT_VFORK
)
561 /* If we leave single-step breakpoints there, child will
562 hit it, so uninsert single-step breakpoints from parent
563 (and child). Once vfork child is done, reinsert
564 them back to parent. */
565 uninsert_single_step_breakpoints (event_thr
);
568 clone_all_breakpoints (child_thr
, event_thr
);
570 tdesc
= XNEW (struct target_desc
);
571 copy_target_description (tdesc
, parent_proc
->tdesc
);
572 child_proc
->tdesc
= tdesc
;
574 /* Clone arch-specific process data. */
575 if (the_low_target
.new_fork
!= NULL
)
576 the_low_target
.new_fork (parent_proc
, child_proc
);
578 /* Save fork info in the parent thread. */
579 if (event
== PTRACE_EVENT_FORK
)
580 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
581 else if (event
== PTRACE_EVENT_VFORK
)
582 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
584 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
586 /* The status_pending field contains bits denoting the
587 extended event, so when the pending event is handled,
588 the handler will look at lwp->waitstatus. */
589 event_lwp
->status_pending_p
= 1;
590 event_lwp
->status_pending
= wstat
;
592 /* Link the threads until the parent event is passed on to
594 event_lwp
->fork_relative
= child_lwp
;
595 child_lwp
->fork_relative
= event_lwp
;
597 /* If the parent thread is doing step-over with single-step
598 breakpoints, the list of single-step breakpoints are cloned
599 from the parent's. Remove them from the child process.
600 In case of vfork, we'll reinsert them back once vforked
602 if (event_lwp
->bp_reinsert
!= 0
603 && can_software_single_step ())
605 /* The child process is forked and stopped, so it is safe
606 to access its memory without stopping all other threads
607 from other processes. */
608 delete_single_step_breakpoints (child_thr
);
610 gdb_assert (has_single_step_breakpoints (event_thr
));
611 gdb_assert (!has_single_step_breakpoints (child_thr
));
614 /* Report the event. */
619 debug_printf ("HEW: Got clone event "
620 "from LWP %ld, new child is LWP %ld\n",
621 lwpid_of (event_thr
), new_pid
);
623 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
624 new_lwp
= add_lwp (ptid
);
626 /* Either we're going to immediately resume the new thread
627 or leave it stopped. linux_resume_one_lwp is a nop if it
628 thinks the thread is currently running, so set this first
629 before calling linux_resume_one_lwp. */
630 new_lwp
->stopped
= 1;
632 /* If we're suspending all threads, leave this one suspended
633 too. If the fork/clone parent is stepping over a breakpoint,
634 all other threads have been suspended already. Leave the
635 child suspended too. */
636 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
637 || event_lwp
->bp_reinsert
!= 0)
638 new_lwp
->suspended
= 1;
640 /* Normally we will get the pending SIGSTOP. But in some cases
641 we might get another signal delivered to the group first.
642 If we do get another signal, be sure not to lose it. */
643 if (WSTOPSIG (status
) != SIGSTOP
)
645 new_lwp
->stop_expected
= 1;
646 new_lwp
->status_pending_p
= 1;
647 new_lwp
->status_pending
= status
;
649 else if (report_thread_events
)
651 new_lwp
->waitstatus
.kind
= TARGET_WAITKIND_THREAD_CREATED
;
652 new_lwp
->status_pending_p
= 1;
653 new_lwp
->status_pending
= status
;
656 /* Don't report the event. */
659 else if (event
== PTRACE_EVENT_VFORK_DONE
)
661 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
663 if (event_lwp
->bp_reinsert
!= 0 && can_software_single_step ())
665 reinsert_single_step_breakpoints (event_thr
);
667 gdb_assert (has_single_step_breakpoints (event_thr
));
670 /* Report the event. */
673 else if (event
== PTRACE_EVENT_EXEC
&& report_exec_events
)
675 struct process_info
*proc
;
676 VEC (int) *syscalls_to_catch
;
682 debug_printf ("HEW: Got exec event from LWP %ld\n",
683 lwpid_of (event_thr
));
686 /* Get the event ptid. */
687 event_ptid
= ptid_of (event_thr
);
688 event_pid
= ptid_get_pid (event_ptid
);
690 /* Save the syscall list from the execing process. */
691 proc
= get_thread_process (event_thr
);
692 syscalls_to_catch
= proc
->syscalls_to_catch
;
693 proc
->syscalls_to_catch
= NULL
;
695 /* Delete the execing process and all its threads. */
697 current_thread
= NULL
;
699 /* Create a new process/lwp/thread. */
700 proc
= linux_add_process (event_pid
, 0);
701 event_lwp
= add_lwp (event_ptid
);
702 event_thr
= get_lwp_thread (event_lwp
);
703 gdb_assert (current_thread
== event_thr
);
704 linux_arch_setup_thread (event_thr
);
706 /* Set the event status. */
707 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
708 event_lwp
->waitstatus
.value
.execd_pathname
709 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
711 /* Mark the exec status as pending. */
712 event_lwp
->stopped
= 1;
713 event_lwp
->status_pending_p
= 1;
714 event_lwp
->status_pending
= wstat
;
715 event_thr
->last_resume_kind
= resume_continue
;
716 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
718 /* Update syscall state in the new lwp, effectively mid-syscall too. */
719 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
721 /* Restore the list to catch. Don't rely on the client, which is free
722 to avoid sending a new list when the architecture doesn't change.
723 Also, for ANY_SYSCALL, the architecture doesn't really matter. */
724 proc
->syscalls_to_catch
= syscalls_to_catch
;
726 /* Report the event. */
727 *orig_event_lwp
= event_lwp
;
731 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
734 /* Return the PC as read from the regcache of LWP, without any
738 get_pc (struct lwp_info
*lwp
)
740 struct thread_info
*saved_thread
;
741 struct regcache
*regcache
;
744 if (the_low_target
.get_pc
== NULL
)
747 saved_thread
= current_thread
;
748 current_thread
= get_lwp_thread (lwp
);
750 regcache
= get_thread_regcache (current_thread
, 1);
751 pc
= (*the_low_target
.get_pc
) (regcache
);
754 debug_printf ("pc is 0x%lx\n", (long) pc
);
756 current_thread
= saved_thread
;
760 /* This function should only be called if LWP got a SYSCALL_SIGTRAP.
761 Fill *SYSNO with the syscall nr trapped. */
764 get_syscall_trapinfo (struct lwp_info
*lwp
, int *sysno
)
766 struct thread_info
*saved_thread
;
767 struct regcache
*regcache
;
769 if (the_low_target
.get_syscall_trapinfo
== NULL
)
771 /* If we cannot get the syscall trapinfo, report an unknown
772 system call number. */
773 *sysno
= UNKNOWN_SYSCALL
;
777 saved_thread
= current_thread
;
778 current_thread
= get_lwp_thread (lwp
);
780 regcache
= get_thread_regcache (current_thread
, 1);
781 (*the_low_target
.get_syscall_trapinfo
) (regcache
, sysno
);
784 debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno
);
786 current_thread
= saved_thread
;
789 static int check_stopped_by_watchpoint (struct lwp_info
*child
);
791 /* Called when the LWP stopped for a signal/trap. If it stopped for a
792 trap check what caused it (breakpoint, watchpoint, trace, etc.),
793 and save the result in the LWP's stop_reason field. If it stopped
794 for a breakpoint, decrement the PC if necessary on the lwp's
795 architecture. Returns true if we now have the LWP's stop PC. */
798 save_stop_reason (struct lwp_info
*lwp
)
801 CORE_ADDR sw_breakpoint_pc
;
802 struct thread_info
*saved_thread
;
803 #if USE_SIGTRAP_SIGINFO
807 if (the_low_target
.get_pc
== NULL
)
811 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
813 /* breakpoint_at reads from the current thread. */
814 saved_thread
= current_thread
;
815 current_thread
= get_lwp_thread (lwp
);
817 #if USE_SIGTRAP_SIGINFO
818 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
819 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
821 if (siginfo
.si_signo
== SIGTRAP
)
823 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
)
824 && GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
826 /* The si_code is ambiguous on this arch -- check debug
828 if (!check_stopped_by_watchpoint (lwp
))
829 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
831 else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
833 /* If we determine the LWP stopped for a SW breakpoint,
834 trust it. Particularly don't check watchpoint
835 registers, because at least on s390, we'd find
836 stopped-by-watchpoint as long as there's a watchpoint
838 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
840 else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
842 /* This can indicate either a hardware breakpoint or
843 hardware watchpoint. Check debug registers. */
844 if (!check_stopped_by_watchpoint (lwp
))
845 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
847 else if (siginfo
.si_code
== TRAP_TRACE
)
849 /* We may have single stepped an instruction that
850 triggered a watchpoint. In that case, on some
851 architectures (such as x86), instead of TRAP_HWBKPT,
852 si_code indicates TRAP_TRACE, and we need to check
853 the debug registers separately. */
854 if (!check_stopped_by_watchpoint (lwp
))
855 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
860 /* We may have just stepped a breakpoint instruction. E.g., in
861 non-stop mode, GDB first tells the thread A to step a range, and
862 then the user inserts a breakpoint inside the range. In that
863 case we need to report the breakpoint PC. */
864 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
865 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
866 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
868 if (hardware_breakpoint_inserted_here (pc
))
869 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
871 if (lwp
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
)
872 check_stopped_by_watchpoint (lwp
);
875 if (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
879 struct thread_info
*thr
= get_lwp_thread (lwp
);
881 debug_printf ("CSBB: %s stopped by software breakpoint\n",
882 target_pid_to_str (ptid_of (thr
)));
885 /* Back up the PC if necessary. */
886 if (pc
!= sw_breakpoint_pc
)
888 struct regcache
*regcache
889 = get_thread_regcache (current_thread
, 1);
890 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
893 /* Update this so we record the correct stop PC below. */
894 pc
= sw_breakpoint_pc
;
896 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
)
900 struct thread_info
*thr
= get_lwp_thread (lwp
);
902 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
903 target_pid_to_str (ptid_of (thr
)));
906 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
910 struct thread_info
*thr
= get_lwp_thread (lwp
);
912 debug_printf ("CSBB: %s stopped by hardware watchpoint\n",
913 target_pid_to_str (ptid_of (thr
)));
916 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
)
920 struct thread_info
*thr
= get_lwp_thread (lwp
);
922 debug_printf ("CSBB: %s stopped by trace\n",
923 target_pid_to_str (ptid_of (thr
)));
928 current_thread
= saved_thread
;
932 static struct lwp_info
*
933 add_lwp (ptid_t ptid
)
935 struct lwp_info
*lwp
;
937 lwp
= XCNEW (struct lwp_info
);
939 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
941 if (the_low_target
.new_thread
!= NULL
)
942 the_low_target
.new_thread (lwp
);
944 lwp
->thread
= add_thread (ptid
, lwp
);
949 /* Start an inferior process and returns its pid.
950 ALLARGS is a vector of program-name and args. */
953 linux_create_inferior (char *program
, char **allargs
)
955 struct lwp_info
*new_lwp
;
958 struct cleanup
*restore_personality
959 = maybe_disable_address_space_randomization (disable_randomization
);
961 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
967 perror_with_name ("fork");
972 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
976 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
977 stdout to stderr so that inferior i/o doesn't corrupt the connection.
978 Also, redirect stdin to /dev/null. */
979 if (remote_connection_is_stdio ())
982 open ("/dev/null", O_RDONLY
);
984 if (write (2, "stdin/stdout redirected\n",
985 sizeof ("stdin/stdout redirected\n") - 1) < 0)
987 /* Errors ignored. */;
991 restore_original_signals_state ();
993 execv (program
, allargs
);
995 execvp (program
, allargs
);
997 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
1003 do_cleanups (restore_personality
);
1005 linux_add_process (pid
, 0);
1007 ptid
= ptid_build (pid
, pid
, 0);
1008 new_lwp
= add_lwp (ptid
);
1009 new_lwp
->must_set_ptrace_flags
= 1;
1014 /* Implement the post_create_inferior target_ops method. */
1017 linux_post_create_inferior (void)
1019 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
1021 linux_arch_setup ();
1023 if (lwp
->must_set_ptrace_flags
)
1025 struct process_info
*proc
= current_process ();
1026 int options
= linux_low_ptrace_options (proc
->attached
);
1028 linux_enable_event_reporting (lwpid_of (current_thread
), options
);
1029 lwp
->must_set_ptrace_flags
= 0;
1033 /* Attach to an inferior process. Returns 0 on success, ERRNO on
1037 linux_attach_lwp (ptid_t ptid
)
1039 struct lwp_info
*new_lwp
;
1040 int lwpid
= ptid_get_lwp (ptid
);
1042 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
1046 new_lwp
= add_lwp (ptid
);
1048 /* We need to wait for SIGSTOP before being able to make the next
1049 ptrace call on this LWP. */
1050 new_lwp
->must_set_ptrace_flags
= 1;
1052 if (linux_proc_pid_is_stopped (lwpid
))
1055 debug_printf ("Attached to a stopped process\n");
1057 /* The process is definitely stopped. It is in a job control
1058 stop, unless the kernel predates the TASK_STOPPED /
1059 TASK_TRACED distinction, in which case it might be in a
1060 ptrace stop. Make sure it is in a ptrace stop; from there we
1061 can kill it, signal it, et cetera.
1063 First make sure there is a pending SIGSTOP. Since we are
1064 already attached, the process can not transition from stopped
1065 to running without a PTRACE_CONT; so we know this signal will
1066 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1067 probably already in the queue (unless this kernel is old
1068 enough to use TASK_STOPPED for ptrace stops); but since
1069 SIGSTOP is not an RT signal, it can only be queued once. */
1070 kill_lwp (lwpid
, SIGSTOP
);
1072 /* Finally, resume the stopped process. This will deliver the
1073 SIGSTOP (or a higher priority signal, just like normal
1074 PTRACE_ATTACH), which we'll catch later on. */
1075 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1078 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
1079 brings it to a halt.
1081 There are several cases to consider here:
1083 1) gdbserver has already attached to the process and is being notified
1084 of a new thread that is being created.
1085 In this case we should ignore that SIGSTOP and resume the
1086 process. This is handled below by setting stop_expected = 1,
1087 and the fact that add_thread sets last_resume_kind ==
1090 2) This is the first thread (the process thread), and we're attaching
1091 to it via attach_inferior.
1092 In this case we want the process thread to stop.
1093 This is handled by having linux_attach set last_resume_kind ==
1094 resume_stop after we return.
1096 If the pid we are attaching to is also the tgid, we attach to and
1097 stop all the existing threads. Otherwise, we attach to pid and
1098 ignore any other threads in the same group as this pid.
1100 3) GDB is connecting to gdbserver and is requesting an enumeration of all
1102 In this case we want the thread to stop.
1103 FIXME: This case is currently not properly handled.
1104 We should wait for the SIGSTOP but don't. Things work apparently
1105 because enough time passes between when we ptrace (ATTACH) and when
1106 gdb makes the next ptrace call on the thread.
1108 On the other hand, if we are currently trying to stop all threads, we
1109 should treat the new thread as if we had sent it a SIGSTOP. This works
1110 because we are guaranteed that the add_lwp call above added us to the
1111 end of the list, and so the new thread has not yet reached
1112 wait_for_sigstop (but will). */
1113 new_lwp
->stop_expected
= 1;
1118 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
1119 already attached. Returns true if a new LWP is found, false
1123 attach_proc_task_lwp_callback (ptid_t ptid
)
1125 /* Is this a new thread? */
1126 if (find_thread_ptid (ptid
) == NULL
)
1128 int lwpid
= ptid_get_lwp (ptid
);
1132 debug_printf ("Found new lwp %d\n", lwpid
);
1134 err
= linux_attach_lwp (ptid
);
1136 /* Be quiet if we simply raced with the thread exiting. EPERM
1137 is returned if the thread's task still exists, and is marked
1138 as exited or zombie, as well as other conditions, so in that
1139 case, confirm the status in /proc/PID/status. */
1141 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1145 debug_printf ("Cannot attach to lwp %d: "
1146 "thread is gone (%d: %s)\n",
1147 lwpid
, err
, strerror (err
));
1152 warning (_("Cannot attach to lwp %d: %s"),
1154 linux_ptrace_attach_fail_reason_string (ptid
, err
));
1162 static void async_file_mark (void);
1164 /* Attach to PID. If PID is the tgid, attach to it and all
1168 linux_attach (unsigned long pid
)
1170 struct process_info
*proc
;
1171 struct thread_info
*initial_thread
;
1172 ptid_t ptid
= ptid_build (pid
, pid
, 0);
1175 /* Attach to PID. We will check for other threads
1177 err
= linux_attach_lwp (ptid
);
1179 error ("Cannot attach to process %ld: %s",
1180 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
1182 proc
= linux_add_process (pid
, 1);
1184 /* Don't ignore the initial SIGSTOP if we just attached to this
1185 process. It will be collected by wait shortly. */
1186 initial_thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
1187 initial_thread
->last_resume_kind
= resume_stop
;
1189 /* We must attach to every LWP. If /proc is mounted, use that to
1190 find them now. On the one hand, the inferior may be using raw
1191 clone instead of using pthreads. On the other hand, even if it
1192 is using pthreads, GDB may not be connected yet (thread_db needs
1193 to do symbol lookups, through qSymbol). Also, thread_db walks
1194 structures in the inferior's address space to find the list of
1195 threads/LWPs, and those structures may well be corrupted. Note
1196 that once thread_db is loaded, we'll still use it to list threads
1197 and associate pthread info with each LWP. */
1198 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1200 /* GDB will shortly read the xml target description for this
1201 process, to figure out the process' architecture. But the target
1202 description is only filled in when the first process/thread in
1203 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1204 that now, otherwise, if GDB is fast enough, it could read the
1205 target description _before_ that initial stop. */
1208 struct lwp_info
*lwp
;
1210 ptid_t pid_ptid
= pid_to_ptid (pid
);
1212 lwpid
= linux_wait_for_event_filtered (pid_ptid
, pid_ptid
,
1214 gdb_assert (lwpid
> 0);
1216 lwp
= find_lwp_pid (pid_to_ptid (lwpid
));
1218 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGSTOP
)
1220 lwp
->status_pending_p
= 1;
1221 lwp
->status_pending
= wstat
;
1224 initial_thread
->last_resume_kind
= resume_continue
;
1228 gdb_assert (proc
->tdesc
!= NULL
);
1241 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
1243 struct counter
*counter
= (struct counter
*) args
;
1245 if (ptid_get_pid (entry
->id
) == counter
->pid
)
1247 if (++counter
->count
> 1)
1255 last_thread_of_process_p (int pid
)
1257 struct counter counter
= { pid
, 0 };
1259 return (find_inferior (&all_threads
,
1260 second_thread_of_pid_p
, &counter
) == NULL
);
1266 linux_kill_one_lwp (struct lwp_info
*lwp
)
1268 struct thread_info
*thr
= get_lwp_thread (lwp
);
1269 int pid
= lwpid_of (thr
);
1271 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1272 there is no signal context, and ptrace(PTRACE_KILL) (or
1273 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1274 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1275 alternative is to kill with SIGKILL. We only need one SIGKILL
1276 per process, not one for each thread. But since we still support
1277 support debugging programs using raw clone without CLONE_THREAD,
1278 we send one for each thread. For years, we used PTRACE_KILL
1279 only, so we're being a bit paranoid about some old kernels where
1280 PTRACE_KILL might work better (dubious if there are any such, but
1281 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1282 second, and so we're fine everywhere. */
1285 kill_lwp (pid
, SIGKILL
);
1288 int save_errno
= errno
;
1290 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1291 target_pid_to_str (ptid_of (thr
)),
1292 save_errno
? strerror (save_errno
) : "OK");
1296 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1299 int save_errno
= errno
;
1301 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1302 target_pid_to_str (ptid_of (thr
)),
1303 save_errno
? strerror (save_errno
) : "OK");
1307 /* Kill LWP and wait for it to die. */
1310 kill_wait_lwp (struct lwp_info
*lwp
)
1312 struct thread_info
*thr
= get_lwp_thread (lwp
);
1313 int pid
= ptid_get_pid (ptid_of (thr
));
1314 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1319 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1323 linux_kill_one_lwp (lwp
);
1325 /* Make sure it died. Notes:
1327 - The loop is most likely unnecessary.
1329 - We don't use linux_wait_for_event as that could delete lwps
1330 while we're iterating over them. We're not interested in
1331 any pending status at this point, only in making sure all
1332 wait status on the kernel side are collected until the
1335 - We don't use __WALL here as the __WALL emulation relies on
1336 SIGCHLD, and killing a stopped process doesn't generate
1337 one, nor an exit status.
1339 res
= my_waitpid (lwpid
, &wstat
, 0);
1340 if (res
== -1 && errno
== ECHILD
)
1341 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1342 } while (res
> 0 && WIFSTOPPED (wstat
));
1344 /* Even if it was stopped, the child may have already disappeared.
1345 E.g., if it was killed by SIGKILL. */
1346 if (res
< 0 && errno
!= ECHILD
)
1347 perror_with_name ("kill_wait_lwp");
1350 /* Callback for `find_inferior'. Kills an lwp of a given process,
1351 except the leader. */
1354 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1356 struct thread_info
*thread
= (struct thread_info
*) entry
;
1357 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1358 int pid
= * (int *) args
;
1360 if (ptid_get_pid (entry
->id
) != pid
)
1363 /* We avoid killing the first thread here, because of a Linux kernel (at
1364 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1365 the children get a chance to be reaped, it will remain a zombie
1368 if (lwpid_of (thread
) == pid
)
1371 debug_printf ("lkop: is last of process %s\n",
1372 target_pid_to_str (entry
->id
));
1376 kill_wait_lwp (lwp
);
1381 linux_kill (int pid
)
1383 struct process_info
*process
;
1384 struct lwp_info
*lwp
;
1386 process
= find_process_pid (pid
);
1387 if (process
== NULL
)
1390 /* If we're killing a running inferior, make sure it is stopped
1391 first, as PTRACE_KILL will not work otherwise. */
1392 stop_all_lwps (0, NULL
);
1394 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1396 /* See the comment in linux_kill_one_lwp. We did not kill the first
1397 thread in the list, so do so now. */
1398 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1403 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1407 kill_wait_lwp (lwp
);
1409 the_target
->mourn (process
);
1411 /* Since we presently can only stop all lwps of all processes, we
1412 need to unstop lwps of other processes. */
1413 unstop_all_lwps (0, NULL
);
1417 /* Get pending signal of THREAD, for detaching purposes. This is the
1418 signal the thread last stopped for, which we need to deliver to the
1419 thread when detaching, otherwise, it'd be suppressed/lost. */
1422 get_detach_signal (struct thread_info
*thread
)
1424 enum gdb_signal signo
= GDB_SIGNAL_0
;
1426 struct lwp_info
*lp
= get_thread_lwp (thread
);
1428 if (lp
->status_pending_p
)
1429 status
= lp
->status_pending
;
1432 /* If the thread had been suspended by gdbserver, and it stopped
1433 cleanly, then it'll have stopped with SIGSTOP. But we don't
1434 want to deliver that SIGSTOP. */
1435 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1436 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1439 /* Otherwise, we may need to deliver the signal we
1441 status
= lp
->last_status
;
1444 if (!WIFSTOPPED (status
))
1447 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1448 target_pid_to_str (ptid_of (thread
)));
1452 /* Extended wait statuses aren't real SIGTRAPs. */
1453 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1456 debug_printf ("GPS: lwp %s had stopped with extended "
1457 "status: no pending signal\n",
1458 target_pid_to_str (ptid_of (thread
)));
1462 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1464 if (program_signals_p
&& !program_signals
[signo
])
1467 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1468 target_pid_to_str (ptid_of (thread
)),
1469 gdb_signal_to_string (signo
));
1472 else if (!program_signals_p
1473 /* If we have no way to know which signals GDB does not
1474 want to have passed to the program, assume
1475 SIGTRAP/SIGINT, which is GDB's default. */
1476 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1479 debug_printf ("GPS: lwp %s had signal %s, "
1480 "but we don't know if we should pass it. "
1481 "Default to not.\n",
1482 target_pid_to_str (ptid_of (thread
)),
1483 gdb_signal_to_string (signo
));
1489 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1490 target_pid_to_str (ptid_of (thread
)),
1491 gdb_signal_to_string (signo
));
1493 return WSTOPSIG (status
);
1497 /* Detach from LWP. */
1500 linux_detach_one_lwp (struct lwp_info
*lwp
)
1502 struct thread_info
*thread
= get_lwp_thread (lwp
);
1506 /* If there is a pending SIGSTOP, get rid of it. */
1507 if (lwp
->stop_expected
)
1510 debug_printf ("Sending SIGCONT to %s\n",
1511 target_pid_to_str (ptid_of (thread
)));
1513 kill_lwp (lwpid_of (thread
), SIGCONT
);
1514 lwp
->stop_expected
= 0;
1517 /* Pass on any pending signal for this thread. */
1518 sig
= get_detach_signal (thread
);
1520 /* Preparing to resume may try to write registers, and fail if the
1521 lwp is zombie. If that happens, ignore the error. We'll handle
1522 it below, when detach fails with ESRCH. */
1525 /* Flush any pending changes to the process's registers. */
1526 regcache_invalidate_thread (thread
);
1528 /* Finally, let it resume. */
1529 if (the_low_target
.prepare_to_resume
!= NULL
)
1530 the_low_target
.prepare_to_resume (lwp
);
1532 CATCH (ex
, RETURN_MASK_ERROR
)
1534 if (!check_ptrace_stopped_lwp_gone (lwp
))
1535 throw_exception (ex
);
1539 lwpid
= lwpid_of (thread
);
1540 if (ptrace (PTRACE_DETACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0,
1541 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1543 int save_errno
= errno
;
1545 /* We know the thread exists, so ESRCH must mean the lwp is
1546 zombie. This can happen if one of the already-detached
1547 threads exits the whole thread group. In that case we're
1548 still attached, and must reap the lwp. */
1549 if (save_errno
== ESRCH
)
1553 ret
= my_waitpid (lwpid
, &status
, __WALL
);
1556 warning (_("Couldn't reap LWP %d while detaching: %s"),
1557 lwpid
, strerror (errno
));
1559 else if (!WIFEXITED (status
) && !WIFSIGNALED (status
))
1561 warning (_("Reaping LWP %d while detaching "
1562 "returned unexpected status 0x%x"),
1568 error (_("Can't detach %s: %s"),
1569 target_pid_to_str (ptid_of (thread
)),
1570 strerror (save_errno
));
1573 else if (debug_threads
)
1575 debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n",
1576 target_pid_to_str (ptid_of (thread
)),
1583 /* Callback for find_inferior. Detaches from non-leader threads of a
1587 linux_detach_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1589 struct thread_info
*thread
= (struct thread_info
*) entry
;
1590 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1591 int pid
= *(int *) args
;
1592 int lwpid
= lwpid_of (thread
);
1594 /* Skip other processes. */
1595 if (ptid_get_pid (entry
->id
) != pid
)
1598 /* We don't actually detach from the thread group leader just yet.
1599 If the thread group exits, we must reap the zombie clone lwps
1600 before we're able to reap the leader. */
1601 if (ptid_get_pid (entry
->id
) == lwpid
)
1604 linux_detach_one_lwp (lwp
);
1609 linux_detach (int pid
)
1611 struct process_info
*process
;
1612 struct lwp_info
*main_lwp
;
1614 process
= find_process_pid (pid
);
1615 if (process
== NULL
)
1618 /* As there's a step over already in progress, let it finish first,
1619 otherwise nesting a stabilize_threads operation on top gets real
1621 complete_ongoing_step_over ();
1623 /* Stop all threads before detaching. First, ptrace requires that
1624 the thread is stopped to sucessfully detach. Second, thread_db
1625 may need to uninstall thread event breakpoints from memory, which
1626 only works with a stopped process anyway. */
1627 stop_all_lwps (0, NULL
);
1629 #ifdef USE_THREAD_DB
1630 thread_db_detach (process
);
1633 /* Stabilize threads (move out of jump pads). */
1634 stabilize_threads ();
1636 /* Detach from the clone lwps first. If the thread group exits just
1637 while we're detaching, we must reap the clone lwps before we're
1638 able to reap the leader. */
1639 find_inferior (&all_threads
, linux_detach_lwp_callback
, &pid
);
1641 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1642 linux_detach_one_lwp (main_lwp
);
1644 the_target
->mourn (process
);
1646 /* Since we presently can only stop all lwps of all processes, we
1647 need to unstop lwps of other processes. */
1648 unstop_all_lwps (0, NULL
);
1652 /* Remove all LWPs that belong to process PROC from the lwp list. */
1655 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1657 struct thread_info
*thread
= (struct thread_info
*) entry
;
1658 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1659 struct process_info
*process
= (struct process_info
*) proc
;
1661 if (pid_of (thread
) == pid_of (process
))
1668 linux_mourn (struct process_info
*process
)
1670 struct process_info_private
*priv
;
1672 #ifdef USE_THREAD_DB
1673 thread_db_mourn (process
);
1676 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1678 /* Freeing all private data. */
1679 priv
= process
->priv
;
1680 free (priv
->arch_private
);
1682 process
->priv
= NULL
;
1684 remove_process (process
);
1688 linux_join (int pid
)
1693 ret
= my_waitpid (pid
, &status
, 0);
1694 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1696 } while (ret
!= -1 || errno
!= ECHILD
);
1699 /* Return nonzero if the given thread is still alive. */
1701 linux_thread_alive (ptid_t ptid
)
1703 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1705 /* We assume we always know if a thread exits. If a whole process
1706 exited but we still haven't been able to report it to GDB, we'll
1707 hold on to the last lwp of the dead process. */
1709 return !lwp_is_marked_dead (lwp
);
1714 /* Return 1 if this lwp still has an interesting status pending. If
1715 not (e.g., it had stopped for a breakpoint that is gone), return
1719 thread_still_has_status_pending_p (struct thread_info
*thread
)
1721 struct lwp_info
*lp
= get_thread_lwp (thread
);
1723 if (!lp
->status_pending_p
)
1726 if (thread
->last_resume_kind
!= resume_stop
1727 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1728 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1730 struct thread_info
*saved_thread
;
1734 gdb_assert (lp
->last_status
!= 0);
1738 saved_thread
= current_thread
;
1739 current_thread
= thread
;
1741 if (pc
!= lp
->stop_pc
)
1744 debug_printf ("PC of %ld changed\n",
1749 #if !USE_SIGTRAP_SIGINFO
1750 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1751 && !(*the_low_target
.breakpoint_at
) (pc
))
1754 debug_printf ("previous SW breakpoint of %ld gone\n",
1758 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1759 && !hardware_breakpoint_inserted_here (pc
))
1762 debug_printf ("previous HW breakpoint of %ld gone\n",
1768 current_thread
= saved_thread
;
1773 debug_printf ("discarding pending breakpoint status\n");
1774 lp
->status_pending_p
= 0;
1782 /* Returns true if LWP is resumed from the client's perspective. */
1785 lwp_resumed (struct lwp_info
*lwp
)
1787 struct thread_info
*thread
= get_lwp_thread (lwp
);
1789 if (thread
->last_resume_kind
!= resume_stop
)
1792 /* Did gdb send us a `vCont;t', but we haven't reported the
1793 corresponding stop to gdb yet? If so, the thread is still
1794 resumed/running from gdb's perspective. */
1795 if (thread
->last_resume_kind
== resume_stop
1796 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1802 /* Return 1 if this lwp has an interesting status pending. */
1804 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1806 struct thread_info
*thread
= (struct thread_info
*) entry
;
1807 struct lwp_info
*lp
= get_thread_lwp (thread
);
1808 ptid_t ptid
= * (ptid_t
*) arg
;
1810 /* Check if we're only interested in events from a specific process
1811 or a specific LWP. */
1812 if (!ptid_match (ptid_of (thread
), ptid
))
1815 if (!lwp_resumed (lp
))
1818 if (lp
->status_pending_p
1819 && !thread_still_has_status_pending_p (thread
))
1821 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1825 return lp
->status_pending_p
;
1829 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1831 ptid_t ptid
= *(ptid_t
*) data
;
1834 if (ptid_get_lwp (ptid
) != 0)
1835 lwp
= ptid_get_lwp (ptid
);
1837 lwp
= ptid_get_pid (ptid
);
1839 if (ptid_get_lwp (entry
->id
) == lwp
)
1846 find_lwp_pid (ptid_t ptid
)
1848 struct inferior_list_entry
*thread
1849 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1854 return get_thread_lwp ((struct thread_info
*) thread
);
1857 /* Return the number of known LWPs in the tgid given by PID. */
1862 struct inferior_list_entry
*inf
, *tmp
;
1865 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1867 if (ptid_get_pid (inf
->id
) == pid
)
1874 /* The arguments passed to iterate_over_lwps. */
1876 struct iterate_over_lwps_args
1878 /* The FILTER argument passed to iterate_over_lwps. */
1881 /* The CALLBACK argument passed to iterate_over_lwps. */
1882 iterate_over_lwps_ftype
*callback
;
1884 /* The DATA argument passed to iterate_over_lwps. */
1888 /* Callback for find_inferior used by iterate_over_lwps to filter
1889 calls to the callback supplied to that function. Returning a
1890 nonzero value causes find_inferiors to stop iterating and return
1891 the current inferior_list_entry. Returning zero indicates that
1892 find_inferiors should continue iterating. */
1895 iterate_over_lwps_filter (struct inferior_list_entry
*entry
, void *args_p
)
1897 struct iterate_over_lwps_args
*args
1898 = (struct iterate_over_lwps_args
*) args_p
;
1900 if (ptid_match (entry
->id
, args
->filter
))
1902 struct thread_info
*thr
= (struct thread_info
*) entry
;
1903 struct lwp_info
*lwp
= get_thread_lwp (thr
);
1905 return (*args
->callback
) (lwp
, args
->data
);
1911 /* See nat/linux-nat.h. */
1914 iterate_over_lwps (ptid_t filter
,
1915 iterate_over_lwps_ftype callback
,
1918 struct iterate_over_lwps_args args
= {filter
, callback
, data
};
1919 struct inferior_list_entry
*entry
;
1921 entry
= find_inferior (&all_threads
, iterate_over_lwps_filter
, &args
);
1925 return get_thread_lwp ((struct thread_info
*) entry
);
1928 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1929 their exits until all other threads in the group have exited. */
1932 check_zombie_leaders (void)
1934 struct process_info
*proc
, *tmp
;
1936 ALL_PROCESSES (proc
, tmp
)
1938 pid_t leader_pid
= pid_of (proc
);
1939 struct lwp_info
*leader_lp
;
1941 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1944 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1945 "num_lwps=%d, zombie=%d\n",
1946 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1947 linux_proc_pid_is_zombie (leader_pid
));
1949 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1950 /* Check if there are other threads in the group, as we may
1951 have raced with the inferior simply exiting. */
1952 && !last_thread_of_process_p (leader_pid
)
1953 && linux_proc_pid_is_zombie (leader_pid
))
1955 /* A leader zombie can mean one of two things:
1957 - It exited, and there's an exit status pending
1958 available, or only the leader exited (not the whole
1959 program). In the latter case, we can't waitpid the
1960 leader's exit status until all other threads are gone.
1962 - There are 3 or more threads in the group, and a thread
1963 other than the leader exec'd. On an exec, the Linux
1964 kernel destroys all other threads (except the execing
1965 one) in the thread group, and resets the execing thread's
1966 tid to the tgid. No exit notification is sent for the
1967 execing thread -- from the ptracer's perspective, it
1968 appears as though the execing thread just vanishes.
1969 Until we reap all other threads except the leader and the
1970 execing thread, the leader will be zombie, and the
1971 execing thread will be in `D (disc sleep)'. As soon as
1972 all other threads are reaped, the execing thread changes
1973 it's tid to the tgid, and the previous (zombie) leader
1974 vanishes, giving place to the "new" leader. We could try
1975 distinguishing the exit and exec cases, by waiting once
1976 more, and seeing if something comes out, but it doesn't
1977 sound useful. The previous leader _does_ go away, and
1978 we'll re-add the new one once we see the exec event
1979 (which is just the same as what would happen if the
1980 previous leader did exit voluntarily before some other
1985 "CZL: Thread group leader %d zombie "
1986 "(it exited, or another thread execd).\n",
1989 delete_lwp (leader_lp
);
1994 /* Callback for `find_inferior'. Returns the first LWP that is not
1995 stopped. ARG is a PTID filter. */
1998 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
2000 struct thread_info
*thr
= (struct thread_info
*) entry
;
2001 struct lwp_info
*lwp
;
2002 ptid_t filter
= *(ptid_t
*) arg
;
2004 if (!ptid_match (ptid_of (thr
), filter
))
2007 lwp
= get_thread_lwp (thr
);
2014 /* Increment LWP's suspend count. */
2017 lwp_suspended_inc (struct lwp_info
*lwp
)
2021 if (debug_threads
&& lwp
->suspended
> 4)
2023 struct thread_info
*thread
= get_lwp_thread (lwp
);
2025 debug_printf ("LWP %ld has a suspiciously high suspend count,"
2026 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
2030 /* Decrement LWP's suspend count. */
2033 lwp_suspended_decr (struct lwp_info
*lwp
)
2037 if (lwp
->suspended
< 0)
2039 struct thread_info
*thread
= get_lwp_thread (lwp
);
2041 internal_error (__FILE__
, __LINE__
,
2042 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
2047 /* This function should only be called if the LWP got a SIGTRAP.
2049 Handle any tracepoint steps or hits. Return true if a tracepoint
2050 event was handled, 0 otherwise. */
2053 handle_tracepoints (struct lwp_info
*lwp
)
2055 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
2056 int tpoint_related_event
= 0;
2058 gdb_assert (lwp
->suspended
== 0);
2060 /* If this tracepoint hit causes a tracing stop, we'll immediately
2061 uninsert tracepoints. To do this, we temporarily pause all
2062 threads, unpatch away, and then unpause threads. We need to make
2063 sure the unpausing doesn't resume LWP too. */
2064 lwp_suspended_inc (lwp
);
2066 /* And we need to be sure that any all-threads-stopping doesn't try
2067 to move threads out of the jump pads, as it could deadlock the
2068 inferior (LWP could be in the jump pad, maybe even holding the
2071 /* Do any necessary step collect actions. */
2072 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2074 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2076 /* See if we just hit a tracepoint and do its main collect
2078 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2080 lwp_suspended_decr (lwp
);
2082 gdb_assert (lwp
->suspended
== 0);
2083 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
2085 if (tpoint_related_event
)
2088 debug_printf ("got a tracepoint event\n");
2095 /* Convenience wrapper. Returns true if LWP is presently collecting a
2099 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2100 struct fast_tpoint_collect_status
*status
)
2102 CORE_ADDR thread_area
;
2103 struct thread_info
*thread
= get_lwp_thread (lwp
);
2105 if (the_low_target
.get_thread_area
== NULL
)
2108 /* Get the thread area address. This is used to recognize which
2109 thread is which when tracing with the in-process agent library.
2110 We don't read anything from the address, and treat it as opaque;
2111 it's the address itself that we assume is unique per-thread. */
2112 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2115 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2118 /* The reason we resume in the caller, is because we want to be able
2119 to pass lwp->status_pending as WSTAT, and we need to clear
2120 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2121 refuses to resume. */
2124 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2126 struct thread_info
*saved_thread
;
2128 saved_thread
= current_thread
;
2129 current_thread
= get_lwp_thread (lwp
);
2132 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2133 && supports_fast_tracepoints ()
2134 && agent_loaded_p ())
2136 struct fast_tpoint_collect_status status
;
2140 debug_printf ("Checking whether LWP %ld needs to move out of the "
2142 lwpid_of (current_thread
));
2144 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
2147 || (WSTOPSIG (*wstat
) != SIGILL
2148 && WSTOPSIG (*wstat
) != SIGFPE
2149 && WSTOPSIG (*wstat
) != SIGSEGV
2150 && WSTOPSIG (*wstat
) != SIGBUS
))
2152 lwp
->collecting_fast_tracepoint
= r
;
2156 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
2158 /* Haven't executed the original instruction yet.
2159 Set breakpoint there, and wait till it's hit,
2160 then single-step until exiting the jump pad. */
2161 lwp
->exit_jump_pad_bkpt
2162 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2166 debug_printf ("Checking whether LWP %ld needs to move out of "
2167 "the jump pad...it does\n",
2168 lwpid_of (current_thread
));
2169 current_thread
= saved_thread
;
2176 /* If we get a synchronous signal while collecting, *and*
2177 while executing the (relocated) original instruction,
2178 reset the PC to point at the tpoint address, before
2179 reporting to GDB. Otherwise, it's an IPA lib bug: just
2180 report the signal to GDB, and pray for the best. */
2182 lwp
->collecting_fast_tracepoint
= 0;
2185 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2186 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2189 struct regcache
*regcache
;
2191 /* The si_addr on a few signals references the address
2192 of the faulting instruction. Adjust that as
2194 if ((WSTOPSIG (*wstat
) == SIGILL
2195 || WSTOPSIG (*wstat
) == SIGFPE
2196 || WSTOPSIG (*wstat
) == SIGBUS
2197 || WSTOPSIG (*wstat
) == SIGSEGV
)
2198 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2199 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2200 /* Final check just to make sure we don't clobber
2201 the siginfo of non-kernel-sent signals. */
2202 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2204 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2205 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2206 (PTRACE_TYPE_ARG3
) 0, &info
);
2209 regcache
= get_thread_regcache (current_thread
, 1);
2210 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2211 lwp
->stop_pc
= status
.tpoint_addr
;
2213 /* Cancel any fast tracepoint lock this thread was
2215 force_unlock_trace_buffer ();
2218 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2221 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2222 "stopping all threads momentarily.\n");
2224 stop_all_lwps (1, lwp
);
2226 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2227 lwp
->exit_jump_pad_bkpt
= NULL
;
2229 unstop_all_lwps (1, lwp
);
2231 gdb_assert (lwp
->suspended
>= 0);
2237 debug_printf ("Checking whether LWP %ld needs to move out of the "
2239 lwpid_of (current_thread
));
2241 current_thread
= saved_thread
;
2245 /* Enqueue one signal in the "signals to report later when out of the
2249 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2251 struct pending_signals
*p_sig
;
2252 struct thread_info
*thread
= get_lwp_thread (lwp
);
2255 debug_printf ("Deferring signal %d for LWP %ld.\n",
2256 WSTOPSIG (*wstat
), lwpid_of (thread
));
2260 struct pending_signals
*sig
;
2262 for (sig
= lwp
->pending_signals_to_report
;
2265 debug_printf (" Already queued %d\n",
2268 debug_printf (" (no more currently queued signals)\n");
2271 /* Don't enqueue non-RT signals if they are already in the deferred
2272 queue. (SIGSTOP being the easiest signal to see ending up here
2274 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2276 struct pending_signals
*sig
;
2278 for (sig
= lwp
->pending_signals_to_report
;
2282 if (sig
->signal
== WSTOPSIG (*wstat
))
2285 debug_printf ("Not requeuing already queued non-RT signal %d"
2294 p_sig
= XCNEW (struct pending_signals
);
2295 p_sig
->prev
= lwp
->pending_signals_to_report
;
2296 p_sig
->signal
= WSTOPSIG (*wstat
);
2298 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2301 lwp
->pending_signals_to_report
= p_sig
;
2304 /* Dequeue one signal from the "signals to report later when out of
2305 the jump pad" list. */
2308 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2310 struct thread_info
*thread
= get_lwp_thread (lwp
);
2312 if (lwp
->pending_signals_to_report
!= NULL
)
2314 struct pending_signals
**p_sig
;
2316 p_sig
= &lwp
->pending_signals_to_report
;
2317 while ((*p_sig
)->prev
!= NULL
)
2318 p_sig
= &(*p_sig
)->prev
;
2320 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2321 if ((*p_sig
)->info
.si_signo
!= 0)
2322 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2328 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2329 WSTOPSIG (*wstat
), lwpid_of (thread
));
2333 struct pending_signals
*sig
;
2335 for (sig
= lwp
->pending_signals_to_report
;
2338 debug_printf (" Still queued %d\n",
2341 debug_printf (" (no more queued signals)\n");
2350 /* Fetch the possibly triggered data watchpoint info and store it in
2353 On some archs, like x86, that use debug registers to set
2354 watchpoints, it's possible that the way to know which watched
2355 address trapped, is to check the register that is used to select
2356 which address to watch. Problem is, between setting the watchpoint
2357 and reading back which data address trapped, the user may change
2358 the set of watchpoints, and, as a consequence, GDB changes the
2359 debug registers in the inferior. To avoid reading back a stale
2360 stopped-data-address when that happens, we cache in LP the fact
2361 that a watchpoint trapped, and the corresponding data address, as
2362 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2363 registers meanwhile, we have the cached data we can rely on. */
2366 check_stopped_by_watchpoint (struct lwp_info
*child
)
2368 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2370 struct thread_info
*saved_thread
;
2372 saved_thread
= current_thread
;
2373 current_thread
= get_lwp_thread (child
);
2375 if (the_low_target
.stopped_by_watchpoint ())
2377 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2379 if (the_low_target
.stopped_data_address
!= NULL
)
2380 child
->stopped_data_address
2381 = the_low_target
.stopped_data_address ();
2383 child
->stopped_data_address
= 0;
2386 current_thread
= saved_thread
;
2389 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2392 /* Return the ptrace options that we want to try to enable. */
2395 linux_low_ptrace_options (int attached
)
2400 options
|= PTRACE_O_EXITKILL
;
2402 if (report_fork_events
)
2403 options
|= PTRACE_O_TRACEFORK
;
2405 if (report_vfork_events
)
2406 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2408 if (report_exec_events
)
2409 options
|= PTRACE_O_TRACEEXEC
;
2411 options
|= PTRACE_O_TRACESYSGOOD
;
2416 /* Do low-level handling of the event, and check if we should go on
2417 and pass it to caller code. Return the affected lwp if we are, or
2420 static struct lwp_info
*
2421 linux_low_filter_event (int lwpid
, int wstat
)
2423 struct lwp_info
*child
;
2424 struct thread_info
*thread
;
2425 int have_stop_pc
= 0;
2427 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2429 /* Check for stop events reported by a process we didn't already
2430 know about - anything not already in our LWP list.
2432 If we're expecting to receive stopped processes after
2433 fork, vfork, and clone events, then we'll just add the
2434 new one to our list and go back to waiting for the event
2435 to be reported - the stopped process might be returned
2436 from waitpid before or after the event is.
2438 But note the case of a non-leader thread exec'ing after the
2439 leader having exited, and gone from our lists (because
2440 check_zombie_leaders deleted it). The non-leader thread
2441 changes its tid to the tgid. */
2443 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2444 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2448 /* A multi-thread exec after we had seen the leader exiting. */
2451 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2452 "after exec.\n", lwpid
);
2455 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2456 child
= add_lwp (child_ptid
);
2458 current_thread
= child
->thread
;
2461 /* If we didn't find a process, one of two things presumably happened:
2462 - A process we started and then detached from has exited. Ignore it.
2463 - A process we are controlling has forked and the new child's stop
2464 was reported to us by the kernel. Save its PID. */
2465 if (child
== NULL
&& WIFSTOPPED (wstat
))
2467 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2470 else if (child
== NULL
)
2473 thread
= get_lwp_thread (child
);
2477 child
->last_status
= wstat
;
2479 /* Check if the thread has exited. */
2480 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2483 debug_printf ("LLFE: %d exited.\n", lwpid
);
2485 if (finish_step_over (child
))
2487 /* Unsuspend all other LWPs, and set them back running again. */
2488 unsuspend_all_lwps (child
);
2491 /* If there is at least one more LWP, then the exit signal was
2492 not the end of the debugged application and should be
2493 ignored, unless GDB wants to hear about thread exits. */
2494 if (report_thread_events
2495 || last_thread_of_process_p (pid_of (thread
)))
2497 /* Since events are serialized to GDB core, and we can't
2498 report this one right now. Leave the status pending for
2499 the next time we're able to report it. */
2500 mark_lwp_dead (child
, wstat
);
2510 gdb_assert (WIFSTOPPED (wstat
));
2512 if (WIFSTOPPED (wstat
))
2514 struct process_info
*proc
;
2516 /* Architecture-specific setup after inferior is running. */
2517 proc
= find_process_pid (pid_of (thread
));
2518 if (proc
->tdesc
== NULL
)
2522 /* This needs to happen after we have attached to the
2523 inferior and it is stopped for the first time, but
2524 before we access any inferior registers. */
2525 linux_arch_setup_thread (thread
);
2529 /* The process is started, but GDBserver will do
2530 architecture-specific setup after the program stops at
2531 the first instruction. */
2532 child
->status_pending_p
= 1;
2533 child
->status_pending
= wstat
;
2539 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2541 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2542 int options
= linux_low_ptrace_options (proc
->attached
);
2544 linux_enable_event_reporting (lwpid
, options
);
2545 child
->must_set_ptrace_flags
= 0;
2548 /* Always update syscall_state, even if it will be filtered later. */
2549 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2551 child
->syscall_state
2552 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2553 ? TARGET_WAITKIND_SYSCALL_RETURN
2554 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2558 /* Almost all other ptrace-stops are known to be outside of system
2559 calls, with further exceptions in handle_extended_wait. */
2560 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2563 /* Be careful to not overwrite stop_pc until save_stop_reason is
2565 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2566 && linux_is_extended_waitstatus (wstat
))
2568 child
->stop_pc
= get_pc (child
);
2569 if (handle_extended_wait (&child
, wstat
))
2571 /* The event has been handled, so just return without
2577 if (linux_wstatus_maybe_breakpoint (wstat
))
2579 if (save_stop_reason (child
))
2584 child
->stop_pc
= get_pc (child
);
2586 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2587 && child
->stop_expected
)
2590 debug_printf ("Expected stop.\n");
2591 child
->stop_expected
= 0;
2593 if (thread
->last_resume_kind
== resume_stop
)
2595 /* We want to report the stop to the core. Treat the
2596 SIGSTOP as a normal event. */
2598 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2599 target_pid_to_str (ptid_of (thread
)));
2601 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2603 /* Stopping threads. We don't want this SIGSTOP to end up
2606 debug_printf ("LLW: SIGSTOP caught for %s "
2607 "while stopping threads.\n",
2608 target_pid_to_str (ptid_of (thread
)));
2613 /* This is a delayed SIGSTOP. Filter out the event. */
2615 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2616 child
->stepping
? "step" : "continue",
2617 target_pid_to_str (ptid_of (thread
)));
2619 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2624 child
->status_pending_p
= 1;
2625 child
->status_pending
= wstat
;
2629 /* Return true if THREAD is doing hardware single step. */
2632 maybe_hw_step (struct thread_info
*thread
)
2634 if (can_hardware_single_step ())
2638 /* GDBserver must insert single-step breakpoint for software
2640 gdb_assert (has_single_step_breakpoints (thread
));
2645 /* Resume LWPs that are currently stopped without any pending status
2646 to report, but are resumed from the core's perspective. */
2649 resume_stopped_resumed_lwps (struct inferior_list_entry
*entry
)
2651 struct thread_info
*thread
= (struct thread_info
*) entry
;
2652 struct lwp_info
*lp
= get_thread_lwp (thread
);
2656 && !lp
->status_pending_p
2657 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2661 if (thread
->last_resume_kind
== resume_step
)
2662 step
= maybe_hw_step (thread
);
2665 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2666 target_pid_to_str (ptid_of (thread
)),
2667 paddress (lp
->stop_pc
),
2670 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2674 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2675 match FILTER_PTID (leaving others pending). The PTIDs can be:
2676 minus_one_ptid, to specify any child; a pid PTID, specifying all
2677 lwps of a thread group; or a PTID representing a single lwp. Store
2678 the stop status through the status pointer WSTAT. OPTIONS is
2679 passed to the waitpid call. Return 0 if no event was found and
2680 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2681 was found. Return the PID of the stopped child otherwise. */
2684 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2685 int *wstatp
, int options
)
2687 struct thread_info
*event_thread
;
2688 struct lwp_info
*event_child
, *requested_child
;
2689 sigset_t block_mask
, prev_mask
;
2692 /* N.B. event_thread points to the thread_info struct that contains
2693 event_child. Keep them in sync. */
2694 event_thread
= NULL
;
2696 requested_child
= NULL
;
2698 /* Check for a lwp with a pending status. */
2700 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2702 event_thread
= (struct thread_info
*)
2703 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2704 if (event_thread
!= NULL
)
2705 event_child
= get_thread_lwp (event_thread
);
2706 if (debug_threads
&& event_thread
)
2707 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2709 else if (!ptid_equal (filter_ptid
, null_ptid
))
2711 requested_child
= find_lwp_pid (filter_ptid
);
2713 if (stopping_threads
== NOT_STOPPING_THREADS
2714 && requested_child
->status_pending_p
2715 && requested_child
->collecting_fast_tracepoint
)
2717 enqueue_one_deferred_signal (requested_child
,
2718 &requested_child
->status_pending
);
2719 requested_child
->status_pending_p
= 0;
2720 requested_child
->status_pending
= 0;
2721 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2724 if (requested_child
->suspended
2725 && requested_child
->status_pending_p
)
2727 internal_error (__FILE__
, __LINE__
,
2728 "requesting an event out of a"
2729 " suspended child?");
2732 if (requested_child
->status_pending_p
)
2734 event_child
= requested_child
;
2735 event_thread
= get_lwp_thread (event_child
);
2739 if (event_child
!= NULL
)
2742 debug_printf ("Got an event from pending child %ld (%04x)\n",
2743 lwpid_of (event_thread
), event_child
->status_pending
);
2744 *wstatp
= event_child
->status_pending
;
2745 event_child
->status_pending_p
= 0;
2746 event_child
->status_pending
= 0;
2747 current_thread
= event_thread
;
2748 return lwpid_of (event_thread
);
2751 /* But if we don't find a pending event, we'll have to wait.
2753 We only enter this loop if no process has a pending wait status.
2754 Thus any action taken in response to a wait status inside this
2755 loop is responding as soon as we detect the status, not after any
2758 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2759 all signals while here. */
2760 sigfillset (&block_mask
);
2761 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2763 /* Always pull all events out of the kernel. We'll randomly select
2764 an event LWP out of all that have events, to prevent
2766 while (event_child
== NULL
)
2770 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2773 - If the thread group leader exits while other threads in the
2774 thread group still exist, waitpid(TGID, ...) hangs. That
2775 waitpid won't return an exit status until the other threads
2776 in the group are reaped.
2778 - When a non-leader thread execs, that thread just vanishes
2779 without reporting an exit (so we'd hang if we waited for it
2780 explicitly in that case). The exec event is reported to
2783 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2786 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2787 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2793 debug_printf ("LLW: waitpid %ld received %s\n",
2794 (long) ret
, status_to_str (*wstatp
));
2797 /* Filter all events. IOW, leave all events pending. We'll
2798 randomly select an event LWP out of all that have events
2800 linux_low_filter_event (ret
, *wstatp
);
2801 /* Retry until nothing comes out of waitpid. A single
2802 SIGCHLD can indicate more than one child stopped. */
2806 /* Now that we've pulled all events out of the kernel, resume
2807 LWPs that don't have an interesting event to report. */
2808 if (stopping_threads
== NOT_STOPPING_THREADS
)
2809 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2811 /* ... and find an LWP with a status to report to the core, if
2813 event_thread
= (struct thread_info
*)
2814 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2815 if (event_thread
!= NULL
)
2817 event_child
= get_thread_lwp (event_thread
);
2818 *wstatp
= event_child
->status_pending
;
2819 event_child
->status_pending_p
= 0;
2820 event_child
->status_pending
= 0;
2824 /* Check for zombie thread group leaders. Those can't be reaped
2825 until all other threads in the thread group are. */
2826 check_zombie_leaders ();
2828 /* If there are no resumed children left in the set of LWPs we
2829 want to wait for, bail. We can't just block in
2830 waitpid/sigsuspend, because lwps might have been left stopped
2831 in trace-stop state, and we'd be stuck forever waiting for
2832 their status to change (which would only happen if we resumed
2833 them). Even if WNOHANG is set, this return code is preferred
2834 over 0 (below), as it is more detailed. */
2835 if ((find_inferior (&all_threads
,
2836 not_stopped_callback
,
2837 &wait_ptid
) == NULL
))
2840 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2841 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2845 /* No interesting event to report to the caller. */
2846 if ((options
& WNOHANG
))
2849 debug_printf ("WNOHANG set, no event found\n");
2851 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2855 /* Block until we get an event reported with SIGCHLD. */
2857 debug_printf ("sigsuspend'ing\n");
2859 sigsuspend (&prev_mask
);
2860 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2864 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2866 current_thread
= event_thread
;
2868 return lwpid_of (event_thread
);
2871 /* Wait for an event from child(ren) PTID. PTIDs can be:
2872 minus_one_ptid, to specify any child; a pid PTID, specifying all
2873 lwps of a thread group; or a PTID representing a single lwp. Store
2874 the stop status through the status pointer WSTAT. OPTIONS is
2875 passed to the waitpid call. Return 0 if no event was found and
2876 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2877 was found. Return the PID of the stopped child otherwise. */
2880 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2882 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2885 /* Count the LWP's that have had events. */
2888 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2890 struct thread_info
*thread
= (struct thread_info
*) entry
;
2891 struct lwp_info
*lp
= get_thread_lwp (thread
);
2892 int *count
= (int *) data
;
2894 gdb_assert (count
!= NULL
);
2896 /* Count only resumed LWPs that have an event pending. */
2897 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2898 && lp
->status_pending_p
)
2904 /* Select the LWP (if any) that is currently being single-stepped. */
2907 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2909 struct thread_info
*thread
= (struct thread_info
*) entry
;
2910 struct lwp_info
*lp
= get_thread_lwp (thread
);
2912 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2913 && thread
->last_resume_kind
== resume_step
2914 && lp
->status_pending_p
)
2920 /* Select the Nth LWP that has had an event. */
2923 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2925 struct thread_info
*thread
= (struct thread_info
*) entry
;
2926 struct lwp_info
*lp
= get_thread_lwp (thread
);
2927 int *selector
= (int *) data
;
2929 gdb_assert (selector
!= NULL
);
2931 /* Select only resumed LWPs that have an event pending. */
2932 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2933 && lp
->status_pending_p
)
2934 if ((*selector
)-- == 0)
2940 /* Select one LWP out of those that have events pending. */
2943 select_event_lwp (struct lwp_info
**orig_lp
)
2946 int random_selector
;
2947 struct thread_info
*event_thread
= NULL
;
2949 /* In all-stop, give preference to the LWP that is being
2950 single-stepped. There will be at most one, and it's the LWP that
2951 the core is most interested in. If we didn't do this, then we'd
2952 have to handle pending step SIGTRAPs somehow in case the core
2953 later continues the previously-stepped thread, otherwise we'd
2954 report the pending SIGTRAP, and the core, not having stepped the
2955 thread, wouldn't understand what the trap was for, and therefore
2956 would report it to the user as a random signal. */
2960 = (struct thread_info
*) find_inferior (&all_threads
,
2961 select_singlestep_lwp_callback
,
2963 if (event_thread
!= NULL
)
2966 debug_printf ("SEL: Select single-step %s\n",
2967 target_pid_to_str (ptid_of (event_thread
)));
2970 if (event_thread
== NULL
)
2972 /* No single-stepping LWP. Select one at random, out of those
2973 which have had events. */
2975 /* First see how many events we have. */
2976 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2977 gdb_assert (num_events
> 0);
2979 /* Now randomly pick a LWP out of those that have had
2981 random_selector
= (int)
2982 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2984 if (debug_threads
&& num_events
> 1)
2985 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2986 num_events
, random_selector
);
2989 = (struct thread_info
*) find_inferior (&all_threads
,
2990 select_event_lwp_callback
,
2994 if (event_thread
!= NULL
)
2996 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2998 /* Switch the event LWP. */
2999 *orig_lp
= event_lp
;
3003 /* Decrement the suspend count of an LWP. */
3006 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
3008 struct thread_info
*thread
= (struct thread_info
*) entry
;
3009 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3011 /* Ignore EXCEPT. */
3015 lwp_suspended_decr (lwp
);
3019 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
3023 unsuspend_all_lwps (struct lwp_info
*except
)
3025 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
3028 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
3029 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
3031 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
3032 static ptid_t
linux_wait_1 (ptid_t ptid
,
3033 struct target_waitstatus
*ourstatus
,
3034 int target_options
);
3036 /* Stabilize threads (move out of jump pads).
3038 If a thread is midway collecting a fast tracepoint, we need to
3039 finish the collection and move it out of the jump pad before
3040 reporting the signal.
3042 This avoids recursion while collecting (when a signal arrives
3043 midway, and the signal handler itself collects), which would trash
3044 the trace buffer. In case the user set a breakpoint in a signal
3045 handler, this avoids the backtrace showing the jump pad, etc..
3046 Most importantly, there are certain things we can't do safely if
3047 threads are stopped in a jump pad (or in its callee's). For
3050 - starting a new trace run. A thread still collecting the
3051 previous run, could trash the trace buffer when resumed. The trace
3052 buffer control structures would have been reset but the thread had
3053 no way to tell. The thread could even midway memcpy'ing to the
3054 buffer, which would mean that when resumed, it would clobber the
3055 trace buffer that had been set for a new run.
3057 - we can't rewrite/reuse the jump pads for new tracepoints
3058 safely. Say you do tstart while a thread is stopped midway while
3059 collecting. When the thread is later resumed, it finishes the
3060 collection, and returns to the jump pad, to execute the original
3061 instruction that was under the tracepoint jump at the time the
3062 older run had been started. If the jump pad had been rewritten
3063 since for something else in the new run, the thread would now
3064 execute the wrong / random instructions. */
3067 linux_stabilize_threads (void)
3069 struct thread_info
*saved_thread
;
3070 struct thread_info
*thread_stuck
;
3073 = (struct thread_info
*) find_inferior (&all_threads
,
3074 stuck_in_jump_pad_callback
,
3076 if (thread_stuck
!= NULL
)
3079 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
3080 lwpid_of (thread_stuck
));
3084 saved_thread
= current_thread
;
3086 stabilizing_threads
= 1;
3089 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
3091 /* Loop until all are stopped out of the jump pads. */
3092 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
3094 struct target_waitstatus ourstatus
;
3095 struct lwp_info
*lwp
;
3098 /* Note that we go through the full wait even loop. While
3099 moving threads out of jump pad, we need to be able to step
3100 over internal breakpoints and such. */
3101 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
3103 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
3105 lwp
= get_thread_lwp (current_thread
);
3108 lwp_suspended_inc (lwp
);
3110 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3111 || current_thread
->last_resume_kind
== resume_stop
)
3113 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3114 enqueue_one_deferred_signal (lwp
, &wstat
);
3119 unsuspend_all_lwps (NULL
);
3121 stabilizing_threads
= 0;
3123 current_thread
= saved_thread
;
3128 = (struct thread_info
*) find_inferior (&all_threads
,
3129 stuck_in_jump_pad_callback
,
3131 if (thread_stuck
!= NULL
)
3132 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3133 lwpid_of (thread_stuck
));
3137 /* Convenience function that is called when the kernel reports an
3138 event that is not passed out to GDB. */
3141 ignore_event (struct target_waitstatus
*ourstatus
)
3143 /* If we got an event, there may still be others, as a single
3144 SIGCHLD can indicate more than one child stopped. This forces
3145 another target_wait call. */
3148 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3152 /* Convenience function that is called when the kernel reports an exit
3153 event. This decides whether to report the event to GDB as a
3154 process exit event, a thread exit event, or to suppress the
3158 filter_exit_event (struct lwp_info
*event_child
,
3159 struct target_waitstatus
*ourstatus
)
3161 struct thread_info
*thread
= get_lwp_thread (event_child
);
3162 ptid_t ptid
= ptid_of (thread
);
3164 if (!last_thread_of_process_p (pid_of (thread
)))
3166 if (report_thread_events
)
3167 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3169 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3171 delete_lwp (event_child
);
3176 /* Returns 1 if GDB is interested in any event_child syscalls. */
3179 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3181 struct thread_info
*thread
= get_lwp_thread (event_child
);
3182 struct process_info
*proc
= get_thread_process (thread
);
3184 return !VEC_empty (int, proc
->syscalls_to_catch
);
3187 /* Returns 1 if GDB is interested in the event_child syscall.
3188 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3191 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3195 struct thread_info
*thread
= get_lwp_thread (event_child
);
3196 struct process_info
*proc
= get_thread_process (thread
);
3198 if (VEC_empty (int, proc
->syscalls_to_catch
))
3201 if (VEC_index (int, proc
->syscalls_to_catch
, 0) == ANY_SYSCALL
)
3204 get_syscall_trapinfo (event_child
, &sysno
);
3206 VEC_iterate (int, proc
->syscalls_to_catch
, i
, iter
);
3214 /* Wait for process, returns status. */
3217 linux_wait_1 (ptid_t ptid
,
3218 struct target_waitstatus
*ourstatus
, int target_options
)
3221 struct lwp_info
*event_child
;
3224 int step_over_finished
;
3225 int bp_explains_trap
;
3226 int maybe_internal_trap
;
3235 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3238 /* Translate generic target options into linux options. */
3240 if (target_options
& TARGET_WNOHANG
)
3243 bp_explains_trap
= 0;
3246 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3248 /* Find a resumed LWP, if any. */
3249 if (find_inferior (&all_threads
,
3250 status_pending_p_callback
,
3251 &minus_one_ptid
) != NULL
)
3253 else if ((find_inferior (&all_threads
,
3254 not_stopped_callback
,
3255 &minus_one_ptid
) != NULL
))
3260 if (ptid_equal (step_over_bkpt
, null_ptid
))
3261 pid
= linux_wait_for_event (ptid
, &w
, options
);
3265 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3266 target_pid_to_str (step_over_bkpt
));
3267 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3270 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3272 gdb_assert (target_options
& TARGET_WNOHANG
);
3276 debug_printf ("linux_wait_1 ret = null_ptid, "
3277 "TARGET_WAITKIND_IGNORE\n");
3281 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3288 debug_printf ("linux_wait_1 ret = null_ptid, "
3289 "TARGET_WAITKIND_NO_RESUMED\n");
3293 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3297 event_child
= get_thread_lwp (current_thread
);
3299 /* linux_wait_for_event only returns an exit status for the last
3300 child of a process. Report it. */
3301 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3305 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3306 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3310 debug_printf ("linux_wait_1 ret = %s, exited with "
3312 target_pid_to_str (ptid_of (current_thread
)),
3319 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3320 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3324 debug_printf ("linux_wait_1 ret = %s, terminated with "
3326 target_pid_to_str (ptid_of (current_thread
)),
3332 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3333 return filter_exit_event (event_child
, ourstatus
);
3335 return ptid_of (current_thread
);
3338 /* If step-over executes a breakpoint instruction, in the case of a
3339 hardware single step it means a gdb/gdbserver breakpoint had been
3340 planted on top of a permanent breakpoint, in the case of a software
3341 single step it may just mean that gdbserver hit the reinsert breakpoint.
3342 The PC has been adjusted by save_stop_reason to point at
3343 the breakpoint address.
3344 So in the case of the hardware single step advance the PC manually
3345 past the breakpoint and in the case of software single step advance only
3346 if it's not the single_step_breakpoint we are hitting.
3347 This avoids that a program would keep trapping a permanent breakpoint
3349 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3350 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3351 && (event_child
->stepping
3352 || !single_step_breakpoint_inserted_here (event_child
->stop_pc
)))
3354 int increment_pc
= 0;
3355 int breakpoint_kind
= 0;
3356 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3359 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3360 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3364 debug_printf ("step-over for %s executed software breakpoint\n",
3365 target_pid_to_str (ptid_of (current_thread
)));
3368 if (increment_pc
!= 0)
3370 struct regcache
*regcache
3371 = get_thread_regcache (current_thread
, 1);
3373 event_child
->stop_pc
+= increment_pc
;
3374 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3376 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3377 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3381 /* If this event was not handled before, and is not a SIGTRAP, we
3382 report it. SIGILL and SIGSEGV are also treated as traps in case
3383 a breakpoint is inserted at the current PC. If this target does
3384 not support internal breakpoints at all, we also report the
3385 SIGTRAP without further processing; it's of no concern to us. */
3387 = (supports_breakpoints ()
3388 && (WSTOPSIG (w
) == SIGTRAP
3389 || ((WSTOPSIG (w
) == SIGILL
3390 || WSTOPSIG (w
) == SIGSEGV
)
3391 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3393 if (maybe_internal_trap
)
3395 /* Handle anything that requires bookkeeping before deciding to
3396 report the event or continue waiting. */
3398 /* First check if we can explain the SIGTRAP with an internal
3399 breakpoint, or if we should possibly report the event to GDB.
3400 Do this before anything that may remove or insert a
3402 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3404 /* We have a SIGTRAP, possibly a step-over dance has just
3405 finished. If so, tweak the state machine accordingly,
3406 reinsert breakpoints and delete any single-step
3408 step_over_finished
= finish_step_over (event_child
);
3410 /* Now invoke the callbacks of any internal breakpoints there. */
3411 check_breakpoints (event_child
->stop_pc
);
3413 /* Handle tracepoint data collecting. This may overflow the
3414 trace buffer, and cause a tracing stop, removing
3416 trace_event
= handle_tracepoints (event_child
);
3418 if (bp_explains_trap
)
3421 debug_printf ("Hit a gdbserver breakpoint.\n");
3426 /* We have some other signal, possibly a step-over dance was in
3427 progress, and it should be cancelled too. */
3428 step_over_finished
= finish_step_over (event_child
);
3431 /* We have all the data we need. Either report the event to GDB, or
3432 resume threads and keep waiting for more. */
3434 /* If we're collecting a fast tracepoint, finish the collection and
3435 move out of the jump pad before delivering a signal. See
3436 linux_stabilize_threads. */
3439 && WSTOPSIG (w
) != SIGTRAP
3440 && supports_fast_tracepoints ()
3441 && agent_loaded_p ())
3444 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3445 "to defer or adjust it.\n",
3446 WSTOPSIG (w
), lwpid_of (current_thread
));
3448 /* Allow debugging the jump pad itself. */
3449 if (current_thread
->last_resume_kind
!= resume_step
3450 && maybe_move_out_of_jump_pad (event_child
, &w
))
3452 enqueue_one_deferred_signal (event_child
, &w
);
3455 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3456 WSTOPSIG (w
), lwpid_of (current_thread
));
3458 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3462 return ignore_event (ourstatus
);
3466 if (event_child
->collecting_fast_tracepoint
)
3469 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3470 "Check if we're already there.\n",
3471 lwpid_of (current_thread
),
3472 event_child
->collecting_fast_tracepoint
);
3476 event_child
->collecting_fast_tracepoint
3477 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3479 if (event_child
->collecting_fast_tracepoint
!= 1)
3481 /* No longer need this breakpoint. */
3482 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3485 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3486 "stopping all threads momentarily.\n");
3488 /* Other running threads could hit this breakpoint.
3489 We don't handle moribund locations like GDB does,
3490 instead we always pause all threads when removing
3491 breakpoints, so that any step-over or
3492 decr_pc_after_break adjustment is always taken
3493 care of while the breakpoint is still
3495 stop_all_lwps (1, event_child
);
3497 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3498 event_child
->exit_jump_pad_bkpt
= NULL
;
3500 unstop_all_lwps (1, event_child
);
3502 gdb_assert (event_child
->suspended
>= 0);
3506 if (event_child
->collecting_fast_tracepoint
== 0)
3509 debug_printf ("fast tracepoint finished "
3510 "collecting successfully.\n");
3512 /* We may have a deferred signal to report. */
3513 if (dequeue_one_deferred_signal (event_child
, &w
))
3516 debug_printf ("dequeued one signal.\n");
3521 debug_printf ("no deferred signals.\n");
3523 if (stabilizing_threads
)
3525 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3526 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3530 debug_printf ("linux_wait_1 ret = %s, stopped "
3531 "while stabilizing threads\n",
3532 target_pid_to_str (ptid_of (current_thread
)));
3536 return ptid_of (current_thread
);
3542 /* Check whether GDB would be interested in this event. */
3544 /* Check if GDB is interested in this syscall. */
3546 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3547 && !gdb_catch_this_syscall_p (event_child
))
3551 debug_printf ("Ignored syscall for LWP %ld.\n",
3552 lwpid_of (current_thread
));
3555 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3560 return ignore_event (ourstatus
);
3563 /* If GDB is not interested in this signal, don't stop other
3564 threads, and don't report it to GDB. Just resume the inferior
3565 right away. We do this for threading-related signals as well as
3566 any that GDB specifically requested we ignore. But never ignore
3567 SIGSTOP if we sent it ourselves, and do not ignore signals when
3568 stepping - they may require special handling to skip the signal
3569 handler. Also never ignore signals that could be caused by a
3572 && current_thread
->last_resume_kind
!= resume_step
3574 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3575 (current_process ()->priv
->thread_db
!= NULL
3576 && (WSTOPSIG (w
) == __SIGRTMIN
3577 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3580 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3581 && !(WSTOPSIG (w
) == SIGSTOP
3582 && current_thread
->last_resume_kind
== resume_stop
)
3583 && !linux_wstatus_maybe_breakpoint (w
))))
3585 siginfo_t info
, *info_p
;
3588 debug_printf ("Ignored signal %d for LWP %ld.\n",
3589 WSTOPSIG (w
), lwpid_of (current_thread
));
3591 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3592 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3597 if (step_over_finished
)
3599 /* We cancelled this thread's step-over above. We still
3600 need to unsuspend all other LWPs, and set them back
3601 running again while the signal handler runs. */
3602 unsuspend_all_lwps (event_child
);
3604 /* Enqueue the pending signal info so that proceed_all_lwps
3606 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3608 proceed_all_lwps ();
3612 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3613 WSTOPSIG (w
), info_p
);
3619 return ignore_event (ourstatus
);
3622 /* Note that all addresses are always "out of the step range" when
3623 there's no range to begin with. */
3624 in_step_range
= lwp_in_step_range (event_child
);
3626 /* If GDB wanted this thread to single step, and the thread is out
3627 of the step range, we always want to report the SIGTRAP, and let
3628 GDB handle it. Watchpoints should always be reported. So should
3629 signals we can't explain. A SIGTRAP we can't explain could be a
3630 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3631 do, we're be able to handle GDB breakpoints on top of internal
3632 breakpoints, by handling the internal breakpoint and still
3633 reporting the event to GDB. If we don't, we're out of luck, GDB
3634 won't see the breakpoint hit. If we see a single-step event but
3635 the thread should be continuing, don't pass the trap to gdb.
3636 That indicates that we had previously finished a single-step but
3637 left the single-step pending -- see
3638 complete_ongoing_step_over. */
3639 report_to_gdb
= (!maybe_internal_trap
3640 || (current_thread
->last_resume_kind
== resume_step
3642 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3644 && !bp_explains_trap
3646 && !step_over_finished
3647 && !(current_thread
->last_resume_kind
== resume_continue
3648 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3649 || (gdb_breakpoint_here (event_child
->stop_pc
)
3650 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3651 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3652 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3654 run_breakpoint_commands (event_child
->stop_pc
);
3656 /* We found no reason GDB would want us to stop. We either hit one
3657 of our own breakpoints, or finished an internal step GDB
3658 shouldn't know about. */
3663 if (bp_explains_trap
)
3664 debug_printf ("Hit a gdbserver breakpoint.\n");
3665 if (step_over_finished
)
3666 debug_printf ("Step-over finished.\n");
3668 debug_printf ("Tracepoint event.\n");
3669 if (lwp_in_step_range (event_child
))
3670 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3671 paddress (event_child
->stop_pc
),
3672 paddress (event_child
->step_range_start
),
3673 paddress (event_child
->step_range_end
));
3676 /* We're not reporting this breakpoint to GDB, so apply the
3677 decr_pc_after_break adjustment to the inferior's regcache
3680 if (the_low_target
.set_pc
!= NULL
)
3682 struct regcache
*regcache
3683 = get_thread_regcache (current_thread
, 1);
3684 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3687 if (step_over_finished
)
3689 /* If we have finished stepping over a breakpoint, we've
3690 stopped and suspended all LWPs momentarily except the
3691 stepping one. This is where we resume them all again.
3692 We're going to keep waiting, so use proceed, which
3693 handles stepping over the next breakpoint. */
3694 unsuspend_all_lwps (event_child
);
3698 /* Remove the single-step breakpoints if any. Note that
3699 there isn't single-step breakpoint if we finished stepping
3701 if (can_software_single_step ()
3702 && has_single_step_breakpoints (current_thread
))
3704 stop_all_lwps (0, event_child
);
3705 delete_single_step_breakpoints (current_thread
);
3706 unstop_all_lwps (0, event_child
);
3711 debug_printf ("proceeding all threads.\n");
3712 proceed_all_lwps ();
3717 return ignore_event (ourstatus
);
3722 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3726 str
= target_waitstatus_to_string (&event_child
->waitstatus
);
3727 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3728 lwpid_of (get_lwp_thread (event_child
)), str
);
3731 if (current_thread
->last_resume_kind
== resume_step
)
3733 if (event_child
->step_range_start
== event_child
->step_range_end
)
3734 debug_printf ("GDB wanted to single-step, reporting event.\n");
3735 else if (!lwp_in_step_range (event_child
))
3736 debug_printf ("Out of step range, reporting event.\n");
3738 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3739 debug_printf ("Stopped by watchpoint.\n");
3740 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3741 debug_printf ("Stopped by GDB breakpoint.\n");
3743 debug_printf ("Hit a non-gdbserver trap event.\n");
3746 /* Alright, we're going to report a stop. */
3748 /* Remove single-step breakpoints. */
3749 if (can_software_single_step ())
3751 /* Remove single-step breakpoints or not. It it is true, stop all
3752 lwps, so that other threads won't hit the breakpoint in the
3754 int remove_single_step_breakpoints_p
= 0;
3758 remove_single_step_breakpoints_p
3759 = has_single_step_breakpoints (current_thread
);
3763 /* In all-stop, a stop reply cancels all previous resume
3764 requests. Delete all single-step breakpoints. */
3765 struct inferior_list_entry
*inf
, *tmp
;
3767 ALL_INFERIORS (&all_threads
, inf
, tmp
)
3769 struct thread_info
*thread
= (struct thread_info
*) inf
;
3771 if (has_single_step_breakpoints (thread
))
3773 remove_single_step_breakpoints_p
= 1;
3779 if (remove_single_step_breakpoints_p
)
3781 /* If we remove single-step breakpoints from memory, stop all lwps,
3782 so that other threads won't hit the breakpoint in the staled
3784 stop_all_lwps (0, event_child
);
3788 gdb_assert (has_single_step_breakpoints (current_thread
));
3789 delete_single_step_breakpoints (current_thread
);
3793 struct inferior_list_entry
*inf
, *tmp
;
3795 ALL_INFERIORS (&all_threads
, inf
, tmp
)
3797 struct thread_info
*thread
= (struct thread_info
*) inf
;
3799 if (has_single_step_breakpoints (thread
))
3800 delete_single_step_breakpoints (thread
);
3804 unstop_all_lwps (0, event_child
);
3808 if (!stabilizing_threads
)
3810 /* In all-stop, stop all threads. */
3812 stop_all_lwps (0, NULL
);
3814 if (step_over_finished
)
3818 /* If we were doing a step-over, all other threads but
3819 the stepping one had been paused in start_step_over,
3820 with their suspend counts incremented. We don't want
3821 to do a full unstop/unpause, because we're in
3822 all-stop mode (so we want threads stopped), but we
3823 still need to unsuspend the other threads, to
3824 decrement their `suspended' count back. */
3825 unsuspend_all_lwps (event_child
);
3829 /* If we just finished a step-over, then all threads had
3830 been momentarily paused. In all-stop, that's fine,
3831 we want threads stopped by now anyway. In non-stop,
3832 we need to re-resume threads that GDB wanted to be
3834 unstop_all_lwps (1, event_child
);
3838 /* If we're not waiting for a specific LWP, choose an event LWP
3839 from among those that have had events. Giving equal priority
3840 to all LWPs that have had events helps prevent
3842 if (ptid_equal (ptid
, minus_one_ptid
))
3844 event_child
->status_pending_p
= 1;
3845 event_child
->status_pending
= w
;
3847 select_event_lwp (&event_child
);
3849 /* current_thread and event_child must stay in sync. */
3850 current_thread
= get_lwp_thread (event_child
);
3852 event_child
->status_pending_p
= 0;
3853 w
= event_child
->status_pending
;
3857 /* Stabilize threads (move out of jump pads). */
3859 stabilize_threads ();
3863 /* If we just finished a step-over, then all threads had been
3864 momentarily paused. In all-stop, that's fine, we want
3865 threads stopped by now anyway. In non-stop, we need to
3866 re-resume threads that GDB wanted to be running. */
3867 if (step_over_finished
)
3868 unstop_all_lwps (1, event_child
);
3871 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3873 /* If the reported event is an exit, fork, vfork or exec, let
3876 /* Break the unreported fork relationship chain. */
3877 if (event_child
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
3878 || event_child
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
)
3880 event_child
->fork_relative
->fork_relative
= NULL
;
3881 event_child
->fork_relative
= NULL
;
3884 *ourstatus
= event_child
->waitstatus
;
3885 /* Clear the event lwp's waitstatus since we handled it already. */
3886 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3889 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3891 /* Now that we've selected our final event LWP, un-adjust its PC if
3892 it was a software breakpoint, and the client doesn't know we can
3893 adjust the breakpoint ourselves. */
3894 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3895 && !swbreak_feature
)
3897 int decr_pc
= the_low_target
.decr_pc_after_break
;
3901 struct regcache
*regcache
3902 = get_thread_regcache (current_thread
, 1);
3903 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3907 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3909 get_syscall_trapinfo (event_child
,
3910 &ourstatus
->value
.syscall_number
);
3911 ourstatus
->kind
= event_child
->syscall_state
;
3913 else if (current_thread
->last_resume_kind
== resume_stop
3914 && WSTOPSIG (w
) == SIGSTOP
)
3916 /* A thread that has been requested to stop by GDB with vCont;t,
3917 and it stopped cleanly, so report as SIG0. The use of
3918 SIGSTOP is an implementation detail. */
3919 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3921 else if (current_thread
->last_resume_kind
== resume_stop
3922 && WSTOPSIG (w
) != SIGSTOP
)
3924 /* A thread that has been requested to stop by GDB with vCont;t,
3925 but, it stopped for other reasons. */
3926 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3928 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3930 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3933 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3937 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3938 target_pid_to_str (ptid_of (current_thread
)),
3939 ourstatus
->kind
, ourstatus
->value
.sig
);
3943 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3944 return filter_exit_event (event_child
, ourstatus
);
3946 return ptid_of (current_thread
);
3949 /* Get rid of any pending event in the pipe. */
3951 async_file_flush (void)
3957 ret
= read (linux_event_pipe
[0], &buf
, 1);
3958 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3961 /* Put something in the pipe, so the event loop wakes up. */
3963 async_file_mark (void)
3967 async_file_flush ();
3970 ret
= write (linux_event_pipe
[1], "+", 1);
3971 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3973 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3974 be awakened anyway. */
3978 linux_wait (ptid_t ptid
,
3979 struct target_waitstatus
*ourstatus
, int target_options
)
3983 /* Flush the async file first. */
3984 if (target_is_async_p ())
3985 async_file_flush ();
3989 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3991 while ((target_options
& TARGET_WNOHANG
) == 0
3992 && ptid_equal (event_ptid
, null_ptid
)
3993 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3995 /* If at least one stop was reported, there may be more. A single
3996 SIGCHLD can signal more than one child stop. */
3997 if (target_is_async_p ()
3998 && (target_options
& TARGET_WNOHANG
) != 0
3999 && !ptid_equal (event_ptid
, null_ptid
))
4005 /* Send a signal to an LWP. */
4008 kill_lwp (unsigned long lwpid
, int signo
)
4013 ret
= syscall (__NR_tkill
, lwpid
, signo
);
4014 if (errno
== ENOSYS
)
4016 /* If tkill fails, then we are not using nptl threads, a
4017 configuration we no longer support. */
4018 perror_with_name (("tkill"));
4024 linux_stop_lwp (struct lwp_info
*lwp
)
4030 send_sigstop (struct lwp_info
*lwp
)
4034 pid
= lwpid_of (get_lwp_thread (lwp
));
4036 /* If we already have a pending stop signal for this process, don't
4038 if (lwp
->stop_expected
)
4041 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
4047 debug_printf ("Sending sigstop to lwp %d\n", pid
);
4049 lwp
->stop_expected
= 1;
4050 kill_lwp (pid
, SIGSTOP
);
4054 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
4056 struct thread_info
*thread
= (struct thread_info
*) entry
;
4057 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4059 /* Ignore EXCEPT. */
4070 /* Increment the suspend count of an LWP, and stop it, if not stopped
4073 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
4076 struct thread_info
*thread
= (struct thread_info
*) entry
;
4077 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4079 /* Ignore EXCEPT. */
4083 lwp_suspended_inc (lwp
);
4085 return send_sigstop_callback (entry
, except
);
4089 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
4091 /* Store the exit status for later. */
4092 lwp
->status_pending_p
= 1;
4093 lwp
->status_pending
= wstat
;
4095 /* Store in waitstatus as well, as there's nothing else to process
4097 if (WIFEXITED (wstat
))
4099 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
4100 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
4102 else if (WIFSIGNALED (wstat
))
4104 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
4105 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
4108 /* Prevent trying to stop it. */
4111 /* No further stops are expected from a dead lwp. */
4112 lwp
->stop_expected
= 0;
4115 /* Return true if LWP has exited already, and has a pending exit event
4116 to report to GDB. */
4119 lwp_is_marked_dead (struct lwp_info
*lwp
)
4121 return (lwp
->status_pending_p
4122 && (WIFEXITED (lwp
->status_pending
)
4123 || WIFSIGNALED (lwp
->status_pending
)));
4126 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4129 wait_for_sigstop (void)
4131 struct thread_info
*saved_thread
;
4136 saved_thread
= current_thread
;
4137 if (saved_thread
!= NULL
)
4138 saved_tid
= saved_thread
->entry
.id
;
4140 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4143 debug_printf ("wait_for_sigstop: pulling events\n");
4145 /* Passing NULL_PTID as filter indicates we want all events to be
4146 left pending. Eventually this returns when there are no
4147 unwaited-for children left. */
4148 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4150 gdb_assert (ret
== -1);
4152 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4153 current_thread
= saved_thread
;
4157 debug_printf ("Previously current thread died.\n");
4159 /* We can't change the current inferior behind GDB's back,
4160 otherwise, a subsequent command may apply to the wrong
4162 current_thread
= NULL
;
4166 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
4167 move it out, because we need to report the stop event to GDB. For
4168 example, if the user puts a breakpoint in the jump pad, it's
4169 because she wants to debug it. */
4172 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
4174 struct thread_info
*thread
= (struct thread_info
*) entry
;
4175 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4177 if (lwp
->suspended
!= 0)
4179 internal_error (__FILE__
, __LINE__
,
4180 "LWP %ld is suspended, suspended=%d\n",
4181 lwpid_of (thread
), lwp
->suspended
);
4183 gdb_assert (lwp
->stopped
);
4185 /* Allow debugging the jump pad, gdb_collect, etc.. */
4186 return (supports_fast_tracepoints ()
4187 && agent_loaded_p ()
4188 && (gdb_breakpoint_here (lwp
->stop_pc
)
4189 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4190 || thread
->last_resume_kind
== resume_step
)
4191 && linux_fast_tracepoint_collecting (lwp
, NULL
));
4195 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
4197 struct thread_info
*thread
= (struct thread_info
*) entry
;
4198 struct thread_info
*saved_thread
;
4199 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4202 if (lwp
->suspended
!= 0)
4204 internal_error (__FILE__
, __LINE__
,
4205 "LWP %ld is suspended, suspended=%d\n",
4206 lwpid_of (thread
), lwp
->suspended
);
4208 gdb_assert (lwp
->stopped
);
4210 /* For gdb_breakpoint_here. */
4211 saved_thread
= current_thread
;
4212 current_thread
= thread
;
4214 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4216 /* Allow debugging the jump pad, gdb_collect, etc. */
4217 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4218 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4219 && thread
->last_resume_kind
!= resume_step
4220 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4223 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4228 lwp
->status_pending_p
= 0;
4229 enqueue_one_deferred_signal (lwp
, wstat
);
4232 debug_printf ("Signal %d for LWP %ld deferred "
4234 WSTOPSIG (*wstat
), lwpid_of (thread
));
4237 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4240 lwp_suspended_inc (lwp
);
4242 current_thread
= saved_thread
;
4246 lwp_running (struct inferior_list_entry
*entry
, void *data
)
4248 struct thread_info
*thread
= (struct thread_info
*) entry
;
4249 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4251 if (lwp_is_marked_dead (lwp
))
4258 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4259 If SUSPEND, then also increase the suspend count of every LWP,
4263 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4265 /* Should not be called recursively. */
4266 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4271 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4272 suspend
? "stop-and-suspend" : "stop",
4274 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4278 stopping_threads
= (suspend
4279 ? STOPPING_AND_SUSPENDING_THREADS
4280 : STOPPING_THREADS
);
4283 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
4285 find_inferior (&all_threads
, send_sigstop_callback
, except
);
4286 wait_for_sigstop ();
4287 stopping_threads
= NOT_STOPPING_THREADS
;
4291 debug_printf ("stop_all_lwps done, setting stopping_threads "
4292 "back to !stopping\n");
4297 /* Enqueue one signal in the chain of signals which need to be
4298 delivered to this process on next resume. */
4301 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4303 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4305 p_sig
->prev
= lwp
->pending_signals
;
4306 p_sig
->signal
= signal
;
4308 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4310 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4311 lwp
->pending_signals
= p_sig
;
4314 /* Install breakpoints for software single stepping. */
4317 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4321 struct thread_info
*thread
= get_lwp_thread (lwp
);
4322 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4323 VEC (CORE_ADDR
) *next_pcs
= NULL
;
4324 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
4326 make_cleanup (VEC_cleanup (CORE_ADDR
), &next_pcs
);
4328 current_thread
= thread
;
4329 next_pcs
= (*the_low_target
.get_next_pcs
) (regcache
);
4331 for (i
= 0; VEC_iterate (CORE_ADDR
, next_pcs
, i
, pc
); ++i
)
4332 set_single_step_breakpoint (pc
, current_ptid
);
4334 do_cleanups (old_chain
);
4337 /* Single step via hardware or software single step.
4338 Return 1 if hardware single stepping, 0 if software single stepping
4339 or can't single step. */
4342 single_step (struct lwp_info
* lwp
)
4346 if (can_hardware_single_step ())
4350 else if (can_software_single_step ())
4352 install_software_single_step_breakpoints (lwp
);
4358 debug_printf ("stepping is not implemented on this target");
4364 /* The signal can be delivered to the inferior if we are not trying to
4365 finish a fast tracepoint collect. Since signal can be delivered in
4366 the step-over, the program may go to signal handler and trap again
4367 after return from the signal handler. We can live with the spurious
4371 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4373 return !lwp
->collecting_fast_tracepoint
;
4376 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4377 SIGNAL is nonzero, give it that signal. */
4380 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4381 int step
, int signal
, siginfo_t
*info
)
4383 struct thread_info
*thread
= get_lwp_thread (lwp
);
4384 struct thread_info
*saved_thread
;
4385 int fast_tp_collecting
;
4387 struct process_info
*proc
= get_thread_process (thread
);
4389 /* Note that target description may not be initialised
4390 (proc->tdesc == NULL) at this point because the program hasn't
4391 stopped at the first instruction yet. It means GDBserver skips
4392 the extra traps from the wrapper program (see option --wrapper).
4393 Code in this function that requires register access should be
4394 guarded by proc->tdesc == NULL or something else. */
4396 if (lwp
->stopped
== 0)
4399 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4401 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
4403 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
4405 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4406 user used the "jump" command, or "set $pc = foo"). */
4407 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4409 /* Collecting 'while-stepping' actions doesn't make sense
4411 release_while_stepping_state_list (thread
);
4414 /* If we have pending signals or status, and a new signal, enqueue the
4415 signal. Also enqueue the signal if it can't be delivered to the
4416 inferior right now. */
4418 && (lwp
->status_pending_p
4419 || lwp
->pending_signals
!= NULL
4420 || !lwp_signal_can_be_delivered (lwp
)))
4422 enqueue_pending_signal (lwp
, signal
, info
);
4424 /* Postpone any pending signal. It was enqueued above. */
4428 if (lwp
->status_pending_p
)
4431 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4432 " has pending status\n",
4433 lwpid_of (thread
), step
? "step" : "continue",
4434 lwp
->stop_expected
? "expected" : "not expected");
4438 saved_thread
= current_thread
;
4439 current_thread
= thread
;
4441 /* This bit needs some thinking about. If we get a signal that
4442 we must report while a single-step reinsert is still pending,
4443 we often end up resuming the thread. It might be better to
4444 (ew) allow a stack of pending events; then we could be sure that
4445 the reinsert happened right away and not lose any signals.
4447 Making this stack would also shrink the window in which breakpoints are
4448 uninserted (see comment in linux_wait_for_lwp) but not enough for
4449 complete correctness, so it won't solve that problem. It may be
4450 worthwhile just to solve this one, however. */
4451 if (lwp
->bp_reinsert
!= 0)
4454 debug_printf (" pending reinsert at 0x%s\n",
4455 paddress (lwp
->bp_reinsert
));
4457 if (can_hardware_single_step ())
4459 if (fast_tp_collecting
== 0)
4462 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
4464 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
4469 step
= maybe_hw_step (thread
);
4472 if (fast_tp_collecting
== 1)
4475 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4476 " (exit-jump-pad-bkpt)\n",
4479 else if (fast_tp_collecting
== 2)
4482 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4483 " single-stepping\n",
4486 if (can_hardware_single_step ())
4490 internal_error (__FILE__
, __LINE__
,
4491 "moving out of jump pad single-stepping"
4492 " not implemented on this target");
4496 /* If we have while-stepping actions in this thread set it stepping.
4497 If we have a signal to deliver, it may or may not be set to
4498 SIG_IGN, we don't know. Assume so, and allow collecting
4499 while-stepping into a signal handler. A possible smart thing to
4500 do would be to set an internal breakpoint at the signal return
4501 address, continue, and carry on catching this while-stepping
4502 action only when that breakpoint is hit. A future
4504 if (thread
->while_stepping
!= NULL
)
4507 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4510 step
= single_step (lwp
);
4513 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4515 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4517 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4521 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4522 (long) lwp
->stop_pc
);
4526 /* If we have pending signals, consume one if it can be delivered to
4528 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4530 struct pending_signals
**p_sig
;
4532 p_sig
= &lwp
->pending_signals
;
4533 while ((*p_sig
)->prev
!= NULL
)
4534 p_sig
= &(*p_sig
)->prev
;
4536 signal
= (*p_sig
)->signal
;
4537 if ((*p_sig
)->info
.si_signo
!= 0)
4538 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4546 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4547 lwpid_of (thread
), step
? "step" : "continue", signal
,
4548 lwp
->stop_expected
? "expected" : "not expected");
4550 if (the_low_target
.prepare_to_resume
!= NULL
)
4551 the_low_target
.prepare_to_resume (lwp
);
4553 regcache_invalidate_thread (thread
);
4555 lwp
->stepping
= step
;
4557 ptrace_request
= PTRACE_SINGLESTEP
;
4558 else if (gdb_catching_syscalls_p (lwp
))
4559 ptrace_request
= PTRACE_SYSCALL
;
4561 ptrace_request
= PTRACE_CONT
;
4562 ptrace (ptrace_request
,
4564 (PTRACE_TYPE_ARG3
) 0,
4565 /* Coerce to a uintptr_t first to avoid potential gcc warning
4566 of coercing an 8 byte integer to a 4 byte pointer. */
4567 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4569 current_thread
= saved_thread
;
4571 perror_with_name ("resuming thread");
4573 /* Successfully resumed. Clear state that no longer makes sense,
4574 and mark the LWP as running. Must not do this before resuming
4575 otherwise if that fails other code will be confused. E.g., we'd
4576 later try to stop the LWP and hang forever waiting for a stop
4577 status. Note that we must not throw after this is cleared,
4578 otherwise handle_zombie_lwp_error would get confused. */
4580 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4583 /* Called when we try to resume a stopped LWP and that errors out. If
4584 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4585 or about to become), discard the error, clear any pending status
4586 the LWP may have, and return true (we'll collect the exit status
4587 soon enough). Otherwise, return false. */
4590 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4592 struct thread_info
*thread
= get_lwp_thread (lp
);
4594 /* If we get an error after resuming the LWP successfully, we'd
4595 confuse !T state for the LWP being gone. */
4596 gdb_assert (lp
->stopped
);
4598 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4599 because even if ptrace failed with ESRCH, the tracee may be "not
4600 yet fully dead", but already refusing ptrace requests. In that
4601 case the tracee has 'R (Running)' state for a little bit
4602 (observed in Linux 3.18). See also the note on ESRCH in the
4603 ptrace(2) man page. Instead, check whether the LWP has any state
4604 other than ptrace-stopped. */
4606 /* Don't assume anything if /proc/PID/status can't be read. */
4607 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4609 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4610 lp
->status_pending_p
= 0;
4616 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4617 disappears while we try to resume it. */
4620 linux_resume_one_lwp (struct lwp_info
*lwp
,
4621 int step
, int signal
, siginfo_t
*info
)
4625 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4627 CATCH (ex
, RETURN_MASK_ERROR
)
4629 if (!check_ptrace_stopped_lwp_gone (lwp
))
4630 throw_exception (ex
);
4635 struct thread_resume_array
4637 struct thread_resume
*resume
;
4641 /* This function is called once per thread via find_inferior.
4642 ARG is a pointer to a thread_resume_array struct.
4643 We look up the thread specified by ENTRY in ARG, and mark the thread
4644 with a pointer to the appropriate resume request.
4646 This algorithm is O(threads * resume elements), but resume elements
4647 is small (and will remain small at least until GDB supports thread
4651 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
4653 struct thread_info
*thread
= (struct thread_info
*) entry
;
4654 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4656 struct thread_resume_array
*r
;
4658 r
= (struct thread_resume_array
*) arg
;
4660 for (ndx
= 0; ndx
< r
->n
; ndx
++)
4662 ptid_t ptid
= r
->resume
[ndx
].thread
;
4663 if (ptid_equal (ptid
, minus_one_ptid
)
4664 || ptid_equal (ptid
, entry
->id
)
4665 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4667 || (ptid_get_pid (ptid
) == pid_of (thread
)
4668 && (ptid_is_pid (ptid
)
4669 || ptid_get_lwp (ptid
) == -1)))
4671 if (r
->resume
[ndx
].kind
== resume_stop
4672 && thread
->last_resume_kind
== resume_stop
)
4675 debug_printf ("already %s LWP %ld at GDB's request\n",
4676 (thread
->last_status
.kind
4677 == TARGET_WAITKIND_STOPPED
)
4685 /* Ignore (wildcard) resume requests for already-resumed
4687 if (r
->resume
[ndx
].kind
!= resume_stop
4688 && thread
->last_resume_kind
!= resume_stop
)
4691 debug_printf ("already %s LWP %ld at GDB's request\n",
4692 (thread
->last_resume_kind
4700 /* Don't let wildcard resumes resume fork children that GDB
4701 does not yet know are new fork children. */
4702 if (lwp
->fork_relative
!= NULL
)
4704 struct inferior_list_entry
*inf
, *tmp
;
4705 struct lwp_info
*rel
= lwp
->fork_relative
;
4707 if (rel
->status_pending_p
4708 && (rel
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
4709 || rel
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
))
4712 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4718 /* If the thread has a pending event that has already been
4719 reported to GDBserver core, but GDB has not pulled the
4720 event out of the vStopped queue yet, likewise, ignore the
4721 (wildcard) resume request. */
4722 if (in_queued_stop_replies (entry
->id
))
4725 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4730 lwp
->resume
= &r
->resume
[ndx
];
4731 thread
->last_resume_kind
= lwp
->resume
->kind
;
4733 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4734 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4736 /* If we had a deferred signal to report, dequeue one now.
4737 This can happen if LWP gets more than one signal while
4738 trying to get out of a jump pad. */
4740 && !lwp
->status_pending_p
4741 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4743 lwp
->status_pending_p
= 1;
4746 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4747 "leaving status pending.\n",
4748 WSTOPSIG (lwp
->status_pending
),
4756 /* No resume action for this thread. */
4762 /* find_inferior callback for linux_resume.
4763 Set *FLAG_P if this lwp has an interesting status pending. */
4766 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
4768 struct thread_info
*thread
= (struct thread_info
*) entry
;
4769 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4771 /* LWPs which will not be resumed are not interesting, because
4772 we might not wait for them next time through linux_wait. */
4773 if (lwp
->resume
== NULL
)
4776 if (thread_still_has_status_pending_p (thread
))
4777 * (int *) flag_p
= 1;
4782 /* Return 1 if this lwp that GDB wants running is stopped at an
4783 internal breakpoint that we need to step over. It assumes that any
4784 required STOP_PC adjustment has already been propagated to the
4785 inferior's regcache. */
4788 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
4790 struct thread_info
*thread
= (struct thread_info
*) entry
;
4791 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4792 struct thread_info
*saved_thread
;
4794 struct process_info
*proc
= get_thread_process (thread
);
4796 /* GDBserver is skipping the extra traps from the wrapper program,
4797 don't have to do step over. */
4798 if (proc
->tdesc
== NULL
)
4801 /* LWPs which will not be resumed are not interesting, because we
4802 might not wait for them next time through linux_wait. */
4807 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4812 if (thread
->last_resume_kind
== resume_stop
)
4815 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4821 gdb_assert (lwp
->suspended
>= 0);
4826 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4831 if (lwp
->status_pending_p
)
4834 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4840 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4844 /* If the PC has changed since we stopped, then don't do anything,
4845 and let the breakpoint/tracepoint be hit. This happens if, for
4846 instance, GDB handled the decr_pc_after_break subtraction itself,
4847 GDB is OOL stepping this thread, or the user has issued a "jump"
4848 command, or poked thread's registers herself. */
4849 if (pc
!= lwp
->stop_pc
)
4852 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4853 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4855 paddress (lwp
->stop_pc
), paddress (pc
));
4859 /* On software single step target, resume the inferior with signal
4860 rather than stepping over. */
4861 if (can_software_single_step ()
4862 && lwp
->pending_signals
!= NULL
4863 && lwp_signal_can_be_delivered (lwp
))
4866 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4873 saved_thread
= current_thread
;
4874 current_thread
= thread
;
4876 /* We can only step over breakpoints we know about. */
4877 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4879 /* Don't step over a breakpoint that GDB expects to hit
4880 though. If the condition is being evaluated on the target's side
4881 and it evaluate to false, step over this breakpoint as well. */
4882 if (gdb_breakpoint_here (pc
)
4883 && gdb_condition_true_at_breakpoint (pc
)
4884 && gdb_no_commands_at_breakpoint (pc
))
4887 debug_printf ("Need step over [LWP %ld]? yes, but found"
4888 " GDB breakpoint at 0x%s; skipping step over\n",
4889 lwpid_of (thread
), paddress (pc
));
4891 current_thread
= saved_thread
;
4897 debug_printf ("Need step over [LWP %ld]? yes, "
4898 "found breakpoint at 0x%s\n",
4899 lwpid_of (thread
), paddress (pc
));
4901 /* We've found an lwp that needs stepping over --- return 1 so
4902 that find_inferior stops looking. */
4903 current_thread
= saved_thread
;
4909 current_thread
= saved_thread
;
4912 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4914 lwpid_of (thread
), paddress (pc
));
4919 /* Start a step-over operation on LWP. When LWP stopped at a
4920 breakpoint, to make progress, we need to remove the breakpoint out
4921 of the way. If we let other threads run while we do that, they may
4922 pass by the breakpoint location and miss hitting it. To avoid
4923 that, a step-over momentarily stops all threads while LWP is
4924 single-stepped by either hardware or software while the breakpoint
4925 is temporarily uninserted from the inferior. When the single-step
4926 finishes, we reinsert the breakpoint, and let all threads that are
4927 supposed to be running, run again. */
4930 start_step_over (struct lwp_info
*lwp
)
4932 struct thread_info
*thread
= get_lwp_thread (lwp
);
4933 struct thread_info
*saved_thread
;
4938 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4941 stop_all_lwps (1, lwp
);
4943 if (lwp
->suspended
!= 0)
4945 internal_error (__FILE__
, __LINE__
,
4946 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4951 debug_printf ("Done stopping all threads for step-over.\n");
4953 /* Note, we should always reach here with an already adjusted PC,
4954 either by GDB (if we're resuming due to GDB's request), or by our
4955 caller, if we just finished handling an internal breakpoint GDB
4956 shouldn't care about. */
4959 saved_thread
= current_thread
;
4960 current_thread
= thread
;
4962 lwp
->bp_reinsert
= pc
;
4963 uninsert_breakpoints_at (pc
);
4964 uninsert_fast_tracepoint_jumps_at (pc
);
4966 step
= single_step (lwp
);
4968 current_thread
= saved_thread
;
4970 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4972 /* Require next event from this LWP. */
4973 step_over_bkpt
= thread
->entry
.id
;
4977 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4978 start_step_over, if still there, and delete any single-step
4979 breakpoints we've set, on non hardware single-step targets. */
4982 finish_step_over (struct lwp_info
*lwp
)
4984 if (lwp
->bp_reinsert
!= 0)
4986 struct thread_info
*saved_thread
= current_thread
;
4989 debug_printf ("Finished step over.\n");
4991 current_thread
= get_lwp_thread (lwp
);
4993 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4994 may be no breakpoint to reinsert there by now. */
4995 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4996 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4998 lwp
->bp_reinsert
= 0;
5000 /* Delete any single-step breakpoints. No longer needed. We
5001 don't have to worry about other threads hitting this trap,
5002 and later not being able to explain it, because we were
5003 stepping over a breakpoint, and we hold all threads but
5004 LWP stopped while doing that. */
5005 if (!can_hardware_single_step ())
5007 gdb_assert (has_single_step_breakpoints (current_thread
));
5008 delete_single_step_breakpoints (current_thread
);
5011 step_over_bkpt
= null_ptid
;
5012 current_thread
= saved_thread
;
5019 /* If there's a step over in progress, wait until all threads stop
5020 (that is, until the stepping thread finishes its step), and
5021 unsuspend all lwps. The stepping thread ends with its status
5022 pending, which is processed later when we get back to processing
5026 complete_ongoing_step_over (void)
5028 if (!ptid_equal (step_over_bkpt
, null_ptid
))
5030 struct lwp_info
*lwp
;
5035 debug_printf ("detach: step over in progress, finish it first\n");
5037 /* Passing NULL_PTID as filter indicates we want all events to
5038 be left pending. Eventually this returns when there are no
5039 unwaited-for children left. */
5040 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
5042 gdb_assert (ret
== -1);
5044 lwp
= find_lwp_pid (step_over_bkpt
);
5046 finish_step_over (lwp
);
5047 step_over_bkpt
= null_ptid
;
5048 unsuspend_all_lwps (lwp
);
5052 /* This function is called once per thread. We check the thread's resume
5053 request, which will tell us whether to resume, step, or leave the thread
5054 stopped; and what signal, if any, it should be sent.
5056 For threads which we aren't explicitly told otherwise, we preserve
5057 the stepping flag; this is used for stepping over gdbserver-placed
5060 If pending_flags was set in any thread, we queue any needed
5061 signals, since we won't actually resume. We already have a pending
5062 event to report, so we don't need to preserve any step requests;
5063 they should be re-issued if necessary. */
5066 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
5068 struct thread_info
*thread
= (struct thread_info
*) entry
;
5069 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5070 int leave_all_stopped
= * (int *) arg
;
5073 if (lwp
->resume
== NULL
)
5076 if (lwp
->resume
->kind
== resume_stop
)
5079 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
5084 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
5086 /* Stop the thread, and wait for the event asynchronously,
5087 through the event loop. */
5093 debug_printf ("already stopped LWP %ld\n",
5096 /* The LWP may have been stopped in an internal event that
5097 was not meant to be notified back to GDB (e.g., gdbserver
5098 breakpoint), so we should be reporting a stop event in
5101 /* If the thread already has a pending SIGSTOP, this is a
5102 no-op. Otherwise, something later will presumably resume
5103 the thread and this will cause it to cancel any pending
5104 operation, due to last_resume_kind == resume_stop. If
5105 the thread already has a pending status to report, we
5106 will still report it the next time we wait - see
5107 status_pending_p_callback. */
5109 /* If we already have a pending signal to report, then
5110 there's no need to queue a SIGSTOP, as this means we're
5111 midway through moving the LWP out of the jumppad, and we
5112 will report the pending signal as soon as that is
5114 if (lwp
->pending_signals_to_report
== NULL
)
5118 /* For stop requests, we're done. */
5120 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5124 /* If this thread which is about to be resumed has a pending status,
5125 then don't resume it - we can just report the pending status.
5126 Likewise if it is suspended, because e.g., another thread is
5127 stepping past a breakpoint. Make sure to queue any signals that
5128 would otherwise be sent. In all-stop mode, we do this decision
5129 based on if *any* thread has a pending status. If there's a
5130 thread that needs the step-over-breakpoint dance, then don't
5131 resume any other thread but that particular one. */
5132 leave_pending
= (lwp
->suspended
5133 || lwp
->status_pending_p
5134 || leave_all_stopped
);
5136 /* If we have a new signal, enqueue the signal. */
5137 if (lwp
->resume
->sig
!= 0)
5139 siginfo_t info
, *info_p
;
5141 /* If this is the same signal we were previously stopped by,
5142 make sure to queue its siginfo. */
5143 if (WIFSTOPPED (lwp
->last_status
)
5144 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
5145 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
5146 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
5151 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
5157 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
5159 proceed_one_lwp (entry
, NULL
);
5164 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5167 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5173 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5175 struct thread_resume_array array
= { resume_info
, n
};
5176 struct thread_info
*need_step_over
= NULL
;
5178 int leave_all_stopped
;
5183 debug_printf ("linux_resume:\n");
5186 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
5188 /* If there is a thread which would otherwise be resumed, which has
5189 a pending status, then don't resume any threads - we can just
5190 report the pending status. Make sure to queue any signals that
5191 would otherwise be sent. In non-stop mode, we'll apply this
5192 logic to each thread individually. We consume all pending events
5193 before considering to start a step-over (in all-stop). */
5196 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
5198 /* If there is a thread which would otherwise be resumed, which is
5199 stopped at a breakpoint that needs stepping over, then don't
5200 resume any threads - have it step over the breakpoint with all
5201 other threads stopped, then resume all threads again. Make sure
5202 to queue any signals that would otherwise be delivered or
5204 if (!any_pending
&& supports_breakpoints ())
5206 = (struct thread_info
*) find_inferior (&all_threads
,
5207 need_step_over_p
, NULL
);
5209 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5213 if (need_step_over
!= NULL
)
5214 debug_printf ("Not resuming all, need step over\n");
5215 else if (any_pending
)
5216 debug_printf ("Not resuming, all-stop and found "
5217 "an LWP with pending status\n");
5219 debug_printf ("Resuming, no pending status or step over needed\n");
5222 /* Even if we're leaving threads stopped, queue all signals we'd
5223 otherwise deliver. */
5224 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
5227 start_step_over (get_thread_lwp (need_step_over
));
5231 debug_printf ("linux_resume done\n");
5235 /* We may have events that were pending that can/should be sent to
5236 the client now. Trigger a linux_wait call. */
5237 if (target_is_async_p ())
5241 /* This function is called once per thread. We check the thread's
5242 last resume request, which will tell us whether to resume, step, or
5243 leave the thread stopped. Any signal the client requested to be
5244 delivered has already been enqueued at this point.
5246 If any thread that GDB wants running is stopped at an internal
5247 breakpoint that needs stepping over, we start a step-over operation
5248 on that particular thread, and leave all others stopped. */
5251 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
5253 struct thread_info
*thread
= (struct thread_info
*) entry
;
5254 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5261 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5266 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5270 if (thread
->last_resume_kind
== resume_stop
5271 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5274 debug_printf (" client wants LWP to remain %ld stopped\n",
5279 if (lwp
->status_pending_p
)
5282 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5287 gdb_assert (lwp
->suspended
>= 0);
5292 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5296 if (thread
->last_resume_kind
== resume_stop
5297 && lwp
->pending_signals_to_report
== NULL
5298 && lwp
->collecting_fast_tracepoint
== 0)
5300 /* We haven't reported this LWP as stopped yet (otherwise, the
5301 last_status.kind check above would catch it, and we wouldn't
5302 reach here. This LWP may have been momentarily paused by a
5303 stop_all_lwps call while handling for example, another LWP's
5304 step-over. In that case, the pending expected SIGSTOP signal
5305 that was queued at vCont;t handling time will have already
5306 been consumed by wait_for_sigstop, and so we need to requeue
5307 another one here. Note that if the LWP already has a SIGSTOP
5308 pending, this is a no-op. */
5311 debug_printf ("Client wants LWP %ld to stop. "
5312 "Making sure it has a SIGSTOP pending\n",
5318 if (thread
->last_resume_kind
== resume_step
)
5321 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5324 /* If resume_step is requested by GDB, install single-step
5325 breakpoints when the thread is about to be actually resumed if
5326 the single-step breakpoints weren't removed. */
5327 if (can_software_single_step ()
5328 && !has_single_step_breakpoints (thread
))
5329 install_software_single_step_breakpoints (lwp
);
5331 step
= maybe_hw_step (thread
);
5333 else if (lwp
->bp_reinsert
!= 0)
5336 debug_printf (" stepping LWP %ld, reinsert set\n",
5339 step
= maybe_hw_step (thread
);
5344 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5349 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
5351 struct thread_info
*thread
= (struct thread_info
*) entry
;
5352 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5357 lwp_suspended_decr (lwp
);
5359 return proceed_one_lwp (entry
, except
);
5362 /* When we finish a step-over, set threads running again. If there's
5363 another thread that may need a step-over, now's the time to start
5364 it. Eventually, we'll move all threads past their breakpoints. */
5367 proceed_all_lwps (void)
5369 struct thread_info
*need_step_over
;
5371 /* If there is a thread which would otherwise be resumed, which is
5372 stopped at a breakpoint that needs stepping over, then don't
5373 resume any threads - have it step over the breakpoint with all
5374 other threads stopped, then resume all threads again. */
5376 if (supports_breakpoints ())
5379 = (struct thread_info
*) find_inferior (&all_threads
,
5380 need_step_over_p
, NULL
);
5382 if (need_step_over
!= NULL
)
5385 debug_printf ("proceed_all_lwps: found "
5386 "thread %ld needing a step-over\n",
5387 lwpid_of (need_step_over
));
5389 start_step_over (get_thread_lwp (need_step_over
));
5395 debug_printf ("Proceeding, no step-over needed\n");
5397 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
5400 /* Stopped LWPs that the client wanted to be running, that don't have
5401 pending statuses, are set to run again, except for EXCEPT, if not
5402 NULL. This undoes a stop_all_lwps call. */
5405 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5411 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5412 lwpid_of (get_lwp_thread (except
)));
5414 debug_printf ("unstopping all lwps\n");
5418 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
5420 find_inferior (&all_threads
, proceed_one_lwp
, except
);
5424 debug_printf ("unstop_all_lwps done\n");
5430 #ifdef HAVE_LINUX_REGSETS
5432 #define use_linux_regsets 1
5434 /* Returns true if REGSET has been disabled. */
5437 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5439 return (info
->disabled_regsets
!= NULL
5440 && info
->disabled_regsets
[regset
- info
->regsets
]);
5443 /* Disable REGSET. */
5446 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5450 dr_offset
= regset
- info
->regsets
;
5451 if (info
->disabled_regsets
== NULL
)
5452 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5453 info
->disabled_regsets
[dr_offset
] = 1;
5457 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5458 struct regcache
*regcache
)
5460 struct regset_info
*regset
;
5461 int saw_general_regs
= 0;
5465 pid
= lwpid_of (current_thread
);
5466 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5471 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5474 buf
= xmalloc (regset
->size
);
5476 nt_type
= regset
->nt_type
;
5480 iov
.iov_len
= regset
->size
;
5481 data
= (void *) &iov
;
5487 res
= ptrace (regset
->get_request
, pid
,
5488 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5490 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5496 /* If we get EIO on a regset, do not try it again for
5497 this process mode. */
5498 disable_regset (regsets_info
, regset
);
5500 else if (errno
== ENODATA
)
5502 /* ENODATA may be returned if the regset is currently
5503 not "active". This can happen in normal operation,
5504 so suppress the warning in this case. */
5506 else if (errno
== ESRCH
)
5508 /* At this point, ESRCH should mean the process is
5509 already gone, in which case we simply ignore attempts
5510 to read its registers. */
5515 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5522 if (regset
->type
== GENERAL_REGS
)
5523 saw_general_regs
= 1;
5524 regset
->store_function (regcache
, buf
);
5528 if (saw_general_regs
)
5535 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5536 struct regcache
*regcache
)
5538 struct regset_info
*regset
;
5539 int saw_general_regs
= 0;
5543 pid
= lwpid_of (current_thread
);
5544 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5549 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5550 || regset
->fill_function
== NULL
)
5553 buf
= xmalloc (regset
->size
);
5555 /* First fill the buffer with the current register set contents,
5556 in case there are any items in the kernel's regset that are
5557 not in gdbserver's regcache. */
5559 nt_type
= regset
->nt_type
;
5563 iov
.iov_len
= regset
->size
;
5564 data
= (void *) &iov
;
5570 res
= ptrace (regset
->get_request
, pid
,
5571 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5573 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5578 /* Then overlay our cached registers on that. */
5579 regset
->fill_function (regcache
, buf
);
5581 /* Only now do we write the register set. */
5583 res
= ptrace (regset
->set_request
, pid
,
5584 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5586 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5594 /* If we get EIO on a regset, do not try it again for
5595 this process mode. */
5596 disable_regset (regsets_info
, regset
);
5598 else if (errno
== ESRCH
)
5600 /* At this point, ESRCH should mean the process is
5601 already gone, in which case we simply ignore attempts
5602 to change its registers. See also the related
5603 comment in linux_resume_one_lwp. */
5609 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5612 else if (regset
->type
== GENERAL_REGS
)
5613 saw_general_regs
= 1;
5616 if (saw_general_regs
)
5622 #else /* !HAVE_LINUX_REGSETS */
5624 #define use_linux_regsets 0
5625 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5626 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5630 /* Return 1 if register REGNO is supported by one of the regset ptrace
5631 calls or 0 if it has to be transferred individually. */
5634 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5636 unsigned char mask
= 1 << (regno
% 8);
5637 size_t index
= regno
/ 8;
5639 return (use_linux_regsets
5640 && (regs_info
->regset_bitmap
== NULL
5641 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5644 #ifdef HAVE_LINUX_USRREGS
5647 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5651 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5652 error ("Invalid register number %d.", regnum
);
5654 addr
= usrregs
->regmap
[regnum
];
5659 /* Fetch one register. */
5661 fetch_register (const struct usrregs_info
*usrregs
,
5662 struct regcache
*regcache
, int regno
)
5669 if (regno
>= usrregs
->num_regs
)
5671 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5674 regaddr
= register_addr (usrregs
, regno
);
5678 size
= ((register_size (regcache
->tdesc
, regno
)
5679 + sizeof (PTRACE_XFER_TYPE
) - 1)
5680 & -sizeof (PTRACE_XFER_TYPE
));
5681 buf
= (char *) alloca (size
);
5683 pid
= lwpid_of (current_thread
);
5684 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5687 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5688 ptrace (PTRACE_PEEKUSER
, pid
,
5689 /* Coerce to a uintptr_t first to avoid potential gcc warning
5690 of coercing an 8 byte integer to a 4 byte pointer. */
5691 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5692 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5694 error ("reading register %d: %s", regno
, strerror (errno
));
5697 if (the_low_target
.supply_ptrace_register
)
5698 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5700 supply_register (regcache
, regno
, buf
);
5703 /* Store one register. */
5705 store_register (const struct usrregs_info
*usrregs
,
5706 struct regcache
*regcache
, int regno
)
5713 if (regno
>= usrregs
->num_regs
)
5715 if ((*the_low_target
.cannot_store_register
) (regno
))
5718 regaddr
= register_addr (usrregs
, regno
);
5722 size
= ((register_size (regcache
->tdesc
, regno
)
5723 + sizeof (PTRACE_XFER_TYPE
) - 1)
5724 & -sizeof (PTRACE_XFER_TYPE
));
5725 buf
= (char *) alloca (size
);
5726 memset (buf
, 0, size
);
5728 if (the_low_target
.collect_ptrace_register
)
5729 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5731 collect_register (regcache
, regno
, buf
);
5733 pid
= lwpid_of (current_thread
);
5734 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5737 ptrace (PTRACE_POKEUSER
, pid
,
5738 /* Coerce to a uintptr_t first to avoid potential gcc warning
5739 about coercing an 8 byte integer to a 4 byte pointer. */
5740 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5741 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5744 /* At this point, ESRCH should mean the process is
5745 already gone, in which case we simply ignore attempts
5746 to change its registers. See also the related
5747 comment in linux_resume_one_lwp. */
5751 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5752 error ("writing register %d: %s", regno
, strerror (errno
));
5754 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5758 /* Fetch all registers, or just one, from the child process.
5759 If REGNO is -1, do this for all registers, skipping any that are
5760 assumed to have been retrieved by regsets_fetch_inferior_registers,
5761 unless ALL is non-zero.
5762 Otherwise, REGNO specifies which register (so we can save time). */
5764 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5765 struct regcache
*regcache
, int regno
, int all
)
5767 struct usrregs_info
*usr
= regs_info
->usrregs
;
5771 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5772 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5773 fetch_register (usr
, regcache
, regno
);
5776 fetch_register (usr
, regcache
, regno
);
5779 /* Store our register values back into the inferior.
5780 If REGNO is -1, do this for all registers, skipping any that are
5781 assumed to have been saved by regsets_store_inferior_registers,
5782 unless ALL is non-zero.
5783 Otherwise, REGNO specifies which register (so we can save time). */
5785 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5786 struct regcache
*regcache
, int regno
, int all
)
5788 struct usrregs_info
*usr
= regs_info
->usrregs
;
5792 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5793 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5794 store_register (usr
, regcache
, regno
);
5797 store_register (usr
, regcache
, regno
);
5800 #else /* !HAVE_LINUX_USRREGS */
5802 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5803 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5809 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5813 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5817 if (the_low_target
.fetch_register
!= NULL
5818 && regs_info
->usrregs
!= NULL
)
5819 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5820 (*the_low_target
.fetch_register
) (regcache
, regno
);
5822 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5823 if (regs_info
->usrregs
!= NULL
)
5824 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5828 if (the_low_target
.fetch_register
!= NULL
5829 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5832 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5834 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5836 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5837 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5842 linux_store_registers (struct regcache
*regcache
, int regno
)
5846 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5850 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5852 if (regs_info
->usrregs
!= NULL
)
5853 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5857 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5859 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5861 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5862 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5867 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5868 to debugger memory starting at MYADDR. */
5871 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5873 int pid
= lwpid_of (current_thread
);
5874 register PTRACE_XFER_TYPE
*buffer
;
5875 register CORE_ADDR addr
;
5882 /* Try using /proc. Don't bother for one word. */
5883 if (len
>= 3 * sizeof (long))
5887 /* We could keep this file open and cache it - possibly one per
5888 thread. That requires some juggling, but is even faster. */
5889 sprintf (filename
, "/proc/%d/mem", pid
);
5890 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5894 /* If pread64 is available, use it. It's faster if the kernel
5895 supports it (only one syscall), and it's 64-bit safe even on
5896 32-bit platforms (for instance, SPARC debugging a SPARC64
5899 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5902 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5903 bytes
= read (fd
, myaddr
, len
);
5910 /* Some data was read, we'll try to get the rest with ptrace. */
5920 /* Round starting address down to longword boundary. */
5921 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5922 /* Round ending address up; get number of longwords that makes. */
5923 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5924 / sizeof (PTRACE_XFER_TYPE
));
5925 /* Allocate buffer of that many longwords. */
5926 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5928 /* Read all the longwords */
5930 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5932 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5933 about coercing an 8 byte integer to a 4 byte pointer. */
5934 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5935 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5936 (PTRACE_TYPE_ARG4
) 0);
5942 /* Copy appropriate bytes out of the buffer. */
5945 i
*= sizeof (PTRACE_XFER_TYPE
);
5946 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5948 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5955 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5956 memory at MEMADDR. On failure (cannot write to the inferior)
5957 returns the value of errno. Always succeeds if LEN is zero. */
5960 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5963 /* Round starting address down to longword boundary. */
5964 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5965 /* Round ending address up; get number of longwords that makes. */
5967 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5968 / sizeof (PTRACE_XFER_TYPE
);
5970 /* Allocate buffer of that many longwords. */
5971 register PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5973 int pid
= lwpid_of (current_thread
);
5977 /* Zero length write always succeeds. */
5983 /* Dump up to four bytes. */
5984 char str
[4 * 2 + 1];
5986 int dump
= len
< 4 ? len
: 4;
5988 for (i
= 0; i
< dump
; i
++)
5990 sprintf (p
, "%02x", myaddr
[i
]);
5995 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5996 str
, (long) memaddr
, pid
);
5999 /* Fill start and end extra bytes of buffer with existing memory data. */
6002 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
6003 about coercing an 8 byte integer to a 4 byte pointer. */
6004 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
6005 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
6006 (PTRACE_TYPE_ARG4
) 0);
6014 = ptrace (PTRACE_PEEKTEXT
, pid
,
6015 /* Coerce to a uintptr_t first to avoid potential gcc warning
6016 about coercing an 8 byte integer to a 4 byte pointer. */
6017 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
6018 * sizeof (PTRACE_XFER_TYPE
)),
6019 (PTRACE_TYPE_ARG4
) 0);
6024 /* Copy data to be written over corresponding part of buffer. */
6026 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
6029 /* Write the entire buffer. */
6031 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
6034 ptrace (PTRACE_POKETEXT
, pid
,
6035 /* Coerce to a uintptr_t first to avoid potential gcc warning
6036 about coercing an 8 byte integer to a 4 byte pointer. */
6037 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
6038 (PTRACE_TYPE_ARG4
) buffer
[i
]);
6047 linux_look_up_symbols (void)
6049 #ifdef USE_THREAD_DB
6050 struct process_info
*proc
= current_process ();
6052 if (proc
->priv
->thread_db
!= NULL
)
6060 linux_request_interrupt (void)
6062 extern unsigned long signal_pid
;
6064 /* Send a SIGINT to the process group. This acts just like the user
6065 typed a ^C on the controlling terminal. */
6066 kill (-signal_pid
, SIGINT
);
6069 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
6070 to debugger memory starting at MYADDR. */
6073 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
6075 char filename
[PATH_MAX
];
6077 int pid
= lwpid_of (current_thread
);
6079 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6081 fd
= open (filename
, O_RDONLY
);
6085 if (offset
!= (CORE_ADDR
) 0
6086 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6089 n
= read (fd
, myaddr
, len
);
6096 /* These breakpoint and watchpoint related wrapper functions simply
6097 pass on the function call if the target has registered a
6098 corresponding function. */
6101 linux_supports_z_point_type (char z_type
)
6103 return (the_low_target
.supports_z_point_type
!= NULL
6104 && the_low_target
.supports_z_point_type (z_type
));
6108 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6109 int size
, struct raw_breakpoint
*bp
)
6111 if (type
== raw_bkpt_type_sw
)
6112 return insert_memory_breakpoint (bp
);
6113 else if (the_low_target
.insert_point
!= NULL
)
6114 return the_low_target
.insert_point (type
, addr
, size
, bp
);
6116 /* Unsupported (see target.h). */
6121 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6122 int size
, struct raw_breakpoint
*bp
)
6124 if (type
== raw_bkpt_type_sw
)
6125 return remove_memory_breakpoint (bp
);
6126 else if (the_low_target
.remove_point
!= NULL
)
6127 return the_low_target
.remove_point (type
, addr
, size
, bp
);
6129 /* Unsupported (see target.h). */
6133 /* Implement the to_stopped_by_sw_breakpoint target_ops
6137 linux_stopped_by_sw_breakpoint (void)
6139 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6141 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
6144 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
6148 linux_supports_stopped_by_sw_breakpoint (void)
6150 return USE_SIGTRAP_SIGINFO
;
6153 /* Implement the to_stopped_by_hw_breakpoint target_ops
6157 linux_stopped_by_hw_breakpoint (void)
6159 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6161 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6164 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6168 linux_supports_stopped_by_hw_breakpoint (void)
6170 return USE_SIGTRAP_SIGINFO
;
6173 /* Implement the supports_hardware_single_step target_ops method. */
6176 linux_supports_hardware_single_step (void)
6178 return can_hardware_single_step ();
6182 linux_supports_software_single_step (void)
6184 return can_software_single_step ();
6188 linux_stopped_by_watchpoint (void)
6190 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6192 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6196 linux_stopped_data_address (void)
6198 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6200 return lwp
->stopped_data_address
;
6203 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6204 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6205 && defined(PT_TEXT_END_ADDR)
6207 /* This is only used for targets that define PT_TEXT_ADDR,
6208 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6209 the target has different ways of acquiring this information, like
6212 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6213 to tell gdb about. */
6216 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6218 unsigned long text
, text_end
, data
;
6219 int pid
= lwpid_of (current_thread
);
6223 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6224 (PTRACE_TYPE_ARG4
) 0);
6225 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6226 (PTRACE_TYPE_ARG4
) 0);
6227 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6228 (PTRACE_TYPE_ARG4
) 0);
6232 /* Both text and data offsets produced at compile-time (and so
6233 used by gdb) are relative to the beginning of the program,
6234 with the data segment immediately following the text segment.
6235 However, the actual runtime layout in memory may put the data
6236 somewhere else, so when we send gdb a data base-address, we
6237 use the real data base address and subtract the compile-time
6238 data base-address from it (which is just the length of the
6239 text segment). BSS immediately follows data in both
6242 *data_p
= data
- (text_end
- text
);
6251 linux_qxfer_osdata (const char *annex
,
6252 unsigned char *readbuf
, unsigned const char *writebuf
,
6253 CORE_ADDR offset
, int len
)
6255 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6258 /* Convert a native/host siginfo object, into/from the siginfo in the
6259 layout of the inferiors' architecture. */
6262 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6266 if (the_low_target
.siginfo_fixup
!= NULL
)
6267 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6269 /* If there was no callback, or the callback didn't do anything,
6270 then just do a straight memcpy. */
6274 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6276 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6281 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6282 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6286 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6288 if (current_thread
== NULL
)
6291 pid
= lwpid_of (current_thread
);
6294 debug_printf ("%s siginfo for lwp %d.\n",
6295 readbuf
!= NULL
? "Reading" : "Writing",
6298 if (offset
>= sizeof (siginfo
))
6301 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6304 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6305 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6306 inferior with a 64-bit GDBSERVER should look the same as debugging it
6307 with a 32-bit GDBSERVER, we need to convert it. */
6308 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6310 if (offset
+ len
> sizeof (siginfo
))
6311 len
= sizeof (siginfo
) - offset
;
6313 if (readbuf
!= NULL
)
6314 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6317 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6319 /* Convert back to ptrace layout before flushing it out. */
6320 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6322 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6329 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6330 so we notice when children change state; as the handler for the
6331 sigsuspend in my_waitpid. */
6334 sigchld_handler (int signo
)
6336 int old_errno
= errno
;
6342 /* fprintf is not async-signal-safe, so call write
6344 if (write (2, "sigchld_handler\n",
6345 sizeof ("sigchld_handler\n") - 1) < 0)
6346 break; /* just ignore */
6350 if (target_is_async_p ())
6351 async_file_mark (); /* trigger a linux_wait */
6357 linux_supports_non_stop (void)
6363 linux_async (int enable
)
6365 int previous
= target_is_async_p ();
6368 debug_printf ("linux_async (%d), previous=%d\n",
6371 if (previous
!= enable
)
6374 sigemptyset (&mask
);
6375 sigaddset (&mask
, SIGCHLD
);
6377 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6381 if (pipe (linux_event_pipe
) == -1)
6383 linux_event_pipe
[0] = -1;
6384 linux_event_pipe
[1] = -1;
6385 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6387 warning ("creating event pipe failed.");
6391 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6392 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6394 /* Register the event loop handler. */
6395 add_file_handler (linux_event_pipe
[0],
6396 handle_target_event
, NULL
);
6398 /* Always trigger a linux_wait. */
6403 delete_file_handler (linux_event_pipe
[0]);
6405 close (linux_event_pipe
[0]);
6406 close (linux_event_pipe
[1]);
6407 linux_event_pipe
[0] = -1;
6408 linux_event_pipe
[1] = -1;
6411 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6418 linux_start_non_stop (int nonstop
)
6420 /* Register or unregister from event-loop accordingly. */
6421 linux_async (nonstop
);
6423 if (target_is_async_p () != (nonstop
!= 0))
6430 linux_supports_multi_process (void)
6435 /* Check if fork events are supported. */
6438 linux_supports_fork_events (void)
6440 return linux_supports_tracefork ();
6443 /* Check if vfork events are supported. */
6446 linux_supports_vfork_events (void)
6448 return linux_supports_tracefork ();
6451 /* Check if exec events are supported. */
6454 linux_supports_exec_events (void)
6456 return linux_supports_traceexec ();
6459 /* Callback for 'find_inferior'. Set the (possibly changed) ptrace
6460 options for the specified lwp. */
6463 reset_lwp_ptrace_options_callback (struct inferior_list_entry
*entry
,
6466 struct thread_info
*thread
= (struct thread_info
*) entry
;
6467 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6471 /* Stop the lwp so we can modify its ptrace options. */
6472 lwp
->must_set_ptrace_flags
= 1;
6473 linux_stop_lwp (lwp
);
6477 /* Already stopped; go ahead and set the ptrace options. */
6478 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6479 int options
= linux_low_ptrace_options (proc
->attached
);
6481 linux_enable_event_reporting (lwpid_of (thread
), options
);
6482 lwp
->must_set_ptrace_flags
= 0;
6488 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6489 ptrace flags for all inferiors. This is in case the new GDB connection
6490 doesn't support the same set of events that the previous one did. */
6493 linux_handle_new_gdb_connection (void)
6497 /* Request that all the lwps reset their ptrace options. */
6498 find_inferior (&all_threads
, reset_lwp_ptrace_options_callback
, &pid
);
6502 linux_supports_disable_randomization (void)
6504 #ifdef HAVE_PERSONALITY
6512 linux_supports_agent (void)
6518 linux_supports_range_stepping (void)
6520 if (*the_low_target
.supports_range_stepping
== NULL
)
6523 return (*the_low_target
.supports_range_stepping
) ();
6526 /* Enumerate spufs IDs for process PID. */
6528 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6534 struct dirent
*entry
;
6536 sprintf (path
, "/proc/%ld/fd", pid
);
6537 dir
= opendir (path
);
6542 while ((entry
= readdir (dir
)) != NULL
)
6548 fd
= atoi (entry
->d_name
);
6552 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6553 if (stat (path
, &st
) != 0)
6555 if (!S_ISDIR (st
.st_mode
))
6558 if (statfs (path
, &stfs
) != 0)
6560 if (stfs
.f_type
!= SPUFS_MAGIC
)
6563 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6565 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6575 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6576 object type, using the /proc file system. */
6578 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6579 unsigned const char *writebuf
,
6580 CORE_ADDR offset
, int len
)
6582 long pid
= lwpid_of (current_thread
);
6587 if (!writebuf
&& !readbuf
)
6595 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6598 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6599 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6604 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6611 ret
= write (fd
, writebuf
, (size_t) len
);
6613 ret
= read (fd
, readbuf
, (size_t) len
);
6619 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6620 struct target_loadseg
6622 /* Core address to which the segment is mapped. */
6624 /* VMA recorded in the program header. */
6626 /* Size of this segment in memory. */
6630 # if defined PT_GETDSBT
6631 struct target_loadmap
6633 /* Protocol version number, must be zero. */
6635 /* Pointer to the DSBT table, its size, and the DSBT index. */
6636 unsigned *dsbt_table
;
6637 unsigned dsbt_size
, dsbt_index
;
6638 /* Number of segments in this map. */
6640 /* The actual memory map. */
6641 struct target_loadseg segs
[/*nsegs*/];
6643 # define LINUX_LOADMAP PT_GETDSBT
6644 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6645 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6647 struct target_loadmap
6649 /* Protocol version number, must be zero. */
6651 /* Number of segments in this map. */
6653 /* The actual memory map. */
6654 struct target_loadseg segs
[/*nsegs*/];
6656 # define LINUX_LOADMAP PTRACE_GETFDPIC
6657 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6658 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6662 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6663 unsigned char *myaddr
, unsigned int len
)
6665 int pid
= lwpid_of (current_thread
);
6667 struct target_loadmap
*data
= NULL
;
6668 unsigned int actual_length
, copy_length
;
6670 if (strcmp (annex
, "exec") == 0)
6671 addr
= (int) LINUX_LOADMAP_EXEC
;
6672 else if (strcmp (annex
, "interp") == 0)
6673 addr
= (int) LINUX_LOADMAP_INTERP
;
6677 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6683 actual_length
= sizeof (struct target_loadmap
)
6684 + sizeof (struct target_loadseg
) * data
->nsegs
;
6686 if (offset
< 0 || offset
> actual_length
)
6689 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6690 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6694 # define linux_read_loadmap NULL
6695 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6698 linux_process_qsupported (char **features
, int count
)
6700 if (the_low_target
.process_qsupported
!= NULL
)
6701 the_low_target
.process_qsupported (features
, count
);
6705 linux_supports_catch_syscall (void)
6707 return (the_low_target
.get_syscall_trapinfo
!= NULL
6708 && linux_supports_tracesysgood ());
6712 linux_get_ipa_tdesc_idx (void)
6714 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6717 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6721 linux_supports_tracepoints (void)
6723 if (*the_low_target
.supports_tracepoints
== NULL
)
6726 return (*the_low_target
.supports_tracepoints
) ();
6730 linux_read_pc (struct regcache
*regcache
)
6732 if (the_low_target
.get_pc
== NULL
)
6735 return (*the_low_target
.get_pc
) (regcache
);
6739 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6741 gdb_assert (the_low_target
.set_pc
!= NULL
);
6743 (*the_low_target
.set_pc
) (regcache
, pc
);
6747 linux_thread_stopped (struct thread_info
*thread
)
6749 return get_thread_lwp (thread
)->stopped
;
6752 /* This exposes stop-all-threads functionality to other modules. */
6755 linux_pause_all (int freeze
)
6757 stop_all_lwps (freeze
, NULL
);
6760 /* This exposes unstop-all-threads functionality to other gdbserver
6764 linux_unpause_all (int unfreeze
)
6766 unstop_all_lwps (unfreeze
, NULL
);
6770 linux_prepare_to_access_memory (void)
6772 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6775 linux_pause_all (1);
6780 linux_done_accessing_memory (void)
6782 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6785 linux_unpause_all (1);
6789 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6790 CORE_ADDR collector
,
6793 CORE_ADDR
*jump_entry
,
6794 CORE_ADDR
*trampoline
,
6795 ULONGEST
*trampoline_size
,
6796 unsigned char *jjump_pad_insn
,
6797 ULONGEST
*jjump_pad_insn_size
,
6798 CORE_ADDR
*adjusted_insn_addr
,
6799 CORE_ADDR
*adjusted_insn_addr_end
,
6802 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6803 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6804 jump_entry
, trampoline
, trampoline_size
,
6805 jjump_pad_insn
, jjump_pad_insn_size
,
6806 adjusted_insn_addr
, adjusted_insn_addr_end
,
6810 static struct emit_ops
*
6811 linux_emit_ops (void)
6813 if (the_low_target
.emit_ops
!= NULL
)
6814 return (*the_low_target
.emit_ops
) ();
6820 linux_get_min_fast_tracepoint_insn_len (void)
6822 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6825 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6828 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6829 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6831 char filename
[PATH_MAX
];
6833 const int auxv_size
= is_elf64
6834 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6835 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6837 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6839 fd
= open (filename
, O_RDONLY
);
6845 while (read (fd
, buf
, auxv_size
) == auxv_size
6846 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6850 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6852 switch (aux
->a_type
)
6855 *phdr_memaddr
= aux
->a_un
.a_val
;
6858 *num_phdr
= aux
->a_un
.a_val
;
6864 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6866 switch (aux
->a_type
)
6869 *phdr_memaddr
= aux
->a_un
.a_val
;
6872 *num_phdr
= aux
->a_un
.a_val
;
6880 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6882 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6883 "phdr_memaddr = %ld, phdr_num = %d",
6884 (long) *phdr_memaddr
, *num_phdr
);
6891 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6894 get_dynamic (const int pid
, const int is_elf64
)
6896 CORE_ADDR phdr_memaddr
, relocation
;
6898 unsigned char *phdr_buf
;
6899 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6901 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6904 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6905 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6907 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6910 /* Compute relocation: it is expected to be 0 for "regular" executables,
6911 non-zero for PIE ones. */
6913 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6916 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6918 if (p
->p_type
== PT_PHDR
)
6919 relocation
= phdr_memaddr
- p
->p_vaddr
;
6923 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6925 if (p
->p_type
== PT_PHDR
)
6926 relocation
= phdr_memaddr
- p
->p_vaddr
;
6929 if (relocation
== -1)
6931 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6932 any real world executables, including PIE executables, have always
6933 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6934 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6935 or present DT_DEBUG anyway (fpc binaries are statically linked).
6937 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6939 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6944 for (i
= 0; i
< num_phdr
; i
++)
6948 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6950 if (p
->p_type
== PT_DYNAMIC
)
6951 return p
->p_vaddr
+ relocation
;
6955 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6957 if (p
->p_type
== PT_DYNAMIC
)
6958 return p
->p_vaddr
+ relocation
;
6965 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6966 can be 0 if the inferior does not yet have the library list initialized.
6967 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6968 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6971 get_r_debug (const int pid
, const int is_elf64
)
6973 CORE_ADDR dynamic_memaddr
;
6974 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6975 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6978 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6979 if (dynamic_memaddr
== 0)
6982 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6986 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6987 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6991 unsigned char buf
[sizeof (Elf64_Xword
)];
6995 #ifdef DT_MIPS_RLD_MAP
6996 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6998 if (linux_read_memory (dyn
->d_un
.d_val
,
6999 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7004 #endif /* DT_MIPS_RLD_MAP */
7005 #ifdef DT_MIPS_RLD_MAP_REL
7006 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
7008 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
7009 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7014 #endif /* DT_MIPS_RLD_MAP_REL */
7016 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
7017 map
= dyn
->d_un
.d_val
;
7019 if (dyn
->d_tag
== DT_NULL
)
7024 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
7025 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
7029 unsigned char buf
[sizeof (Elf32_Word
)];
7033 #ifdef DT_MIPS_RLD_MAP
7034 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
7036 if (linux_read_memory (dyn
->d_un
.d_val
,
7037 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7042 #endif /* DT_MIPS_RLD_MAP */
7043 #ifdef DT_MIPS_RLD_MAP_REL
7044 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
7046 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
7047 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7052 #endif /* DT_MIPS_RLD_MAP_REL */
7054 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
7055 map
= dyn
->d_un
.d_val
;
7057 if (dyn
->d_tag
== DT_NULL
)
7061 dynamic_memaddr
+= dyn_size
;
7067 /* Read one pointer from MEMADDR in the inferior. */
7070 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
7074 /* Go through a union so this works on either big or little endian
7075 hosts, when the inferior's pointer size is smaller than the size
7076 of CORE_ADDR. It is assumed the inferior's endianness is the
7077 same of the superior's. */
7080 CORE_ADDR core_addr
;
7085 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
7088 if (ptr_size
== sizeof (CORE_ADDR
))
7089 *ptr
= addr
.core_addr
;
7090 else if (ptr_size
== sizeof (unsigned int))
7093 gdb_assert_not_reached ("unhandled pointer size");
7098 struct link_map_offsets
7100 /* Offset and size of r_debug.r_version. */
7101 int r_version_offset
;
7103 /* Offset and size of r_debug.r_map. */
7106 /* Offset to l_addr field in struct link_map. */
7109 /* Offset to l_name field in struct link_map. */
7112 /* Offset to l_ld field in struct link_map. */
7115 /* Offset to l_next field in struct link_map. */
7118 /* Offset to l_prev field in struct link_map. */
7122 /* Construct qXfer:libraries-svr4:read reply. */
7125 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
7126 unsigned const char *writebuf
,
7127 CORE_ADDR offset
, int len
)
7130 unsigned document_len
;
7131 struct process_info_private
*const priv
= current_process ()->priv
;
7132 char filename
[PATH_MAX
];
7135 static const struct link_map_offsets lmo_32bit_offsets
=
7137 0, /* r_version offset. */
7138 4, /* r_debug.r_map offset. */
7139 0, /* l_addr offset in link_map. */
7140 4, /* l_name offset in link_map. */
7141 8, /* l_ld offset in link_map. */
7142 12, /* l_next offset in link_map. */
7143 16 /* l_prev offset in link_map. */
7146 static const struct link_map_offsets lmo_64bit_offsets
=
7148 0, /* r_version offset. */
7149 8, /* r_debug.r_map offset. */
7150 0, /* l_addr offset in link_map. */
7151 8, /* l_name offset in link_map. */
7152 16, /* l_ld offset in link_map. */
7153 24, /* l_next offset in link_map. */
7154 32 /* l_prev offset in link_map. */
7156 const struct link_map_offsets
*lmo
;
7157 unsigned int machine
;
7159 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7160 int allocated
= 1024;
7162 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7163 int header_done
= 0;
7165 if (writebuf
!= NULL
)
7167 if (readbuf
== NULL
)
7170 pid
= lwpid_of (current_thread
);
7171 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7172 is_elf64
= elf_64_file_p (filename
, &machine
);
7173 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7174 ptr_size
= is_elf64
? 8 : 4;
7176 while (annex
[0] != '\0')
7182 sep
= strchr (annex
, '=');
7187 if (len
== 5 && startswith (annex
, "start"))
7189 else if (len
== 4 && startswith (annex
, "prev"))
7193 annex
= strchr (sep
, ';');
7200 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7207 if (priv
->r_debug
== 0)
7208 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7210 /* We failed to find DT_DEBUG. Such situation will not change
7211 for this inferior - do not retry it. Report it to GDB as
7212 E01, see for the reasons at the GDB solib-svr4.c side. */
7213 if (priv
->r_debug
== (CORE_ADDR
) -1)
7216 if (priv
->r_debug
!= 0)
7218 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7219 (unsigned char *) &r_version
,
7220 sizeof (r_version
)) != 0
7223 warning ("unexpected r_debug version %d", r_version
);
7225 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7226 &lm_addr
, ptr_size
) != 0)
7228 warning ("unable to read r_map from 0x%lx",
7229 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7234 document
= (char *) xmalloc (allocated
);
7235 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7236 p
= document
+ strlen (document
);
7239 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7240 &l_name
, ptr_size
) == 0
7241 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7242 &l_addr
, ptr_size
) == 0
7243 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7244 &l_ld
, ptr_size
) == 0
7245 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7246 &l_prev
, ptr_size
) == 0
7247 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7248 &l_next
, ptr_size
) == 0)
7250 unsigned char libname
[PATH_MAX
];
7252 if (lm_prev
!= l_prev
)
7254 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7255 (long) lm_prev
, (long) l_prev
);
7259 /* Ignore the first entry even if it has valid name as the first entry
7260 corresponds to the main executable. The first entry should not be
7261 skipped if the dynamic loader was loaded late by a static executable
7262 (see solib-svr4.c parameter ignore_first). But in such case the main
7263 executable does not have PT_DYNAMIC present and this function already
7264 exited above due to failed get_r_debug. */
7267 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7272 /* Not checking for error because reading may stop before
7273 we've got PATH_MAX worth of characters. */
7275 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7276 libname
[sizeof (libname
) - 1] = '\0';
7277 if (libname
[0] != '\0')
7279 /* 6x the size for xml_escape_text below. */
7280 size_t len
= 6 * strlen ((char *) libname
);
7285 /* Terminate `<library-list-svr4'. */
7290 while (allocated
< p
- document
+ len
+ 200)
7292 /* Expand to guarantee sufficient storage. */
7293 uintptr_t document_len
= p
- document
;
7295 document
= (char *) xrealloc (document
, 2 * allocated
);
7297 p
= document
+ document_len
;
7300 name
= xml_escape_text ((char *) libname
);
7301 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7302 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7303 name
, (unsigned long) lm_addr
,
7304 (unsigned long) l_addr
, (unsigned long) l_ld
);
7315 /* Empty list; terminate `<library-list-svr4'. */
7319 strcpy (p
, "</library-list-svr4>");
7321 document_len
= strlen (document
);
7322 if (offset
< document_len
)
7323 document_len
-= offset
;
7326 if (len
> document_len
)
7329 memcpy (readbuf
, document
+ offset
, len
);
7335 #ifdef HAVE_LINUX_BTRACE
7337 /* See to_disable_btrace target method. */
7340 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7342 enum btrace_error err
;
7344 err
= linux_disable_btrace (tinfo
);
7345 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7348 /* Encode an Intel Processor Trace configuration. */
7351 linux_low_encode_pt_config (struct buffer
*buffer
,
7352 const struct btrace_data_pt_config
*config
)
7354 buffer_grow_str (buffer
, "<pt-config>\n");
7356 switch (config
->cpu
.vendor
)
7359 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7360 "model=\"%u\" stepping=\"%u\"/>\n",
7361 config
->cpu
.family
, config
->cpu
.model
,
7362 config
->cpu
.stepping
);
7369 buffer_grow_str (buffer
, "</pt-config>\n");
7372 /* Encode a raw buffer. */
7375 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7381 /* We use hex encoding - see common/rsp-low.h. */
7382 buffer_grow_str (buffer
, "<raw>\n");
7388 elem
[0] = tohex ((*data
>> 4) & 0xf);
7389 elem
[1] = tohex (*data
++ & 0xf);
7391 buffer_grow (buffer
, elem
, 2);
7394 buffer_grow_str (buffer
, "</raw>\n");
7397 /* See to_read_btrace target method. */
7400 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7401 enum btrace_read_type type
)
7403 struct btrace_data btrace
;
7404 struct btrace_block
*block
;
7405 enum btrace_error err
;
7408 btrace_data_init (&btrace
);
7410 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7411 if (err
!= BTRACE_ERR_NONE
)
7413 if (err
== BTRACE_ERR_OVERFLOW
)
7414 buffer_grow_str0 (buffer
, "E.Overflow.");
7416 buffer_grow_str0 (buffer
, "E.Generic Error.");
7421 switch (btrace
.format
)
7423 case BTRACE_FORMAT_NONE
:
7424 buffer_grow_str0 (buffer
, "E.No Trace.");
7427 case BTRACE_FORMAT_BTS
:
7428 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7429 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7432 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7434 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7435 paddress (block
->begin
), paddress (block
->end
));
7437 buffer_grow_str0 (buffer
, "</btrace>\n");
7440 case BTRACE_FORMAT_PT
:
7441 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7442 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7443 buffer_grow_str (buffer
, "<pt>\n");
7445 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7447 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7448 btrace
.variant
.pt
.size
);
7450 buffer_grow_str (buffer
, "</pt>\n");
7451 buffer_grow_str0 (buffer
, "</btrace>\n");
7455 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7459 btrace_data_fini (&btrace
);
7463 btrace_data_fini (&btrace
);
7467 /* See to_btrace_conf target method. */
7470 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7471 struct buffer
*buffer
)
7473 const struct btrace_config
*conf
;
7475 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7476 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7478 conf
= linux_btrace_conf (tinfo
);
7481 switch (conf
->format
)
7483 case BTRACE_FORMAT_NONE
:
7486 case BTRACE_FORMAT_BTS
:
7487 buffer_xml_printf (buffer
, "<bts");
7488 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7489 buffer_xml_printf (buffer
, " />\n");
7492 case BTRACE_FORMAT_PT
:
7493 buffer_xml_printf (buffer
, "<pt");
7494 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7495 buffer_xml_printf (buffer
, "/>\n");
7500 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7503 #endif /* HAVE_LINUX_BTRACE */
7505 /* See nat/linux-nat.h. */
7508 current_lwp_ptid (void)
7510 return ptid_of (current_thread
);
7513 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7516 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7518 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7519 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7521 return default_breakpoint_kind_from_pc (pcptr
);
7524 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7526 static const gdb_byte
*
7527 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7529 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7531 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7534 /* Implementation of the target_ops method
7535 "breakpoint_kind_from_current_state". */
7538 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7540 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7541 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7543 return linux_breakpoint_kind_from_pc (pcptr
);
7546 /* Default implementation of linux_target_ops method "set_pc" for
7547 32-bit pc register which is literally named "pc". */
7550 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7552 uint32_t newpc
= pc
;
7554 supply_register_by_name (regcache
, "pc", &newpc
);
7557 /* Default implementation of linux_target_ops method "get_pc" for
7558 32-bit pc register which is literally named "pc". */
7561 linux_get_pc_32bit (struct regcache
*regcache
)
7565 collect_register_by_name (regcache
, "pc", &pc
);
7567 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7571 /* Default implementation of linux_target_ops method "set_pc" for
7572 64-bit pc register which is literally named "pc". */
7575 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7577 uint64_t newpc
= pc
;
7579 supply_register_by_name (regcache
, "pc", &newpc
);
7582 /* Default implementation of linux_target_ops method "get_pc" for
7583 64-bit pc register which is literally named "pc". */
7586 linux_get_pc_64bit (struct regcache
*regcache
)
7590 collect_register_by_name (regcache
, "pc", &pc
);
7592 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7597 static struct target_ops linux_target_ops
= {
7598 linux_create_inferior
,
7599 linux_post_create_inferior
,
7608 linux_fetch_registers
,
7609 linux_store_registers
,
7610 linux_prepare_to_access_memory
,
7611 linux_done_accessing_memory
,
7614 linux_look_up_symbols
,
7615 linux_request_interrupt
,
7617 linux_supports_z_point_type
,
7620 linux_stopped_by_sw_breakpoint
,
7621 linux_supports_stopped_by_sw_breakpoint
,
7622 linux_stopped_by_hw_breakpoint
,
7623 linux_supports_stopped_by_hw_breakpoint
,
7624 linux_supports_hardware_single_step
,
7625 linux_stopped_by_watchpoint
,
7626 linux_stopped_data_address
,
7627 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7628 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7629 && defined(PT_TEXT_END_ADDR)
7634 #ifdef USE_THREAD_DB
7635 thread_db_get_tls_address
,
7640 hostio_last_error_from_errno
,
7643 linux_supports_non_stop
,
7645 linux_start_non_stop
,
7646 linux_supports_multi_process
,
7647 linux_supports_fork_events
,
7648 linux_supports_vfork_events
,
7649 linux_supports_exec_events
,
7650 linux_handle_new_gdb_connection
,
7651 #ifdef USE_THREAD_DB
7652 thread_db_handle_monitor_command
,
7656 linux_common_core_of_thread
,
7658 linux_process_qsupported
,
7659 linux_supports_tracepoints
,
7662 linux_thread_stopped
,
7666 linux_stabilize_threads
,
7667 linux_install_fast_tracepoint_jump_pad
,
7669 linux_supports_disable_randomization
,
7670 linux_get_min_fast_tracepoint_insn_len
,
7671 linux_qxfer_libraries_svr4
,
7672 linux_supports_agent
,
7673 #ifdef HAVE_LINUX_BTRACE
7674 linux_supports_btrace
,
7675 linux_enable_btrace
,
7676 linux_low_disable_btrace
,
7677 linux_low_read_btrace
,
7678 linux_low_btrace_conf
,
7686 linux_supports_range_stepping
,
7687 linux_proc_pid_to_exec_file
,
7688 linux_mntns_open_cloexec
,
7690 linux_mntns_readlink
,
7691 linux_breakpoint_kind_from_pc
,
7692 linux_sw_breakpoint_from_kind
,
7693 linux_proc_tid_get_name
,
7694 linux_breakpoint_kind_from_current_state
,
7695 linux_supports_software_single_step
,
7696 linux_supports_catch_syscall
,
7697 linux_get_ipa_tdesc_idx
,
7700 #ifdef HAVE_LINUX_REGSETS
7702 initialize_regsets_info (struct regsets_info
*info
)
7704 for (info
->num_regsets
= 0;
7705 info
->regsets
[info
->num_regsets
].size
>= 0;
7706 info
->num_regsets
++)
7712 initialize_low (void)
7714 struct sigaction sigchld_action
;
7716 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7717 set_target_ops (&linux_target_ops
);
7719 linux_ptrace_init_warnings ();
7721 sigchld_action
.sa_handler
= sigchld_handler
;
7722 sigemptyset (&sigchld_action
.sa_mask
);
7723 sigchld_action
.sa_flags
= SA_RESTART
;
7724 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7726 initialize_low_arch ();
7728 linux_check_ptrace_features ();