1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2018 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"
50 #include "common-inferior.h"
51 #include "nat/fork-inferior.h"
53 #include "common/scoped_restore.h"
55 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
56 then ELFMAG0 will have been defined. If it didn't get included by
57 gdb_proc_service.h then including it will likely introduce a duplicate
58 definition of elf_fpregset_t. */
61 #include "nat/linux-namespaces.h"
64 #define SPUFS_MAGIC 0x23c9b64e
67 #ifdef HAVE_PERSONALITY
68 # include <sys/personality.h>
69 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
70 # define ADDR_NO_RANDOMIZE 0x0040000
78 /* Some targets did not define these ptrace constants from the start,
79 so gdbserver defines them locally here. In the future, these may
80 be removed after they are added to asm/ptrace.h. */
81 #if !(defined(PT_TEXT_ADDR) \
82 || defined(PT_DATA_ADDR) \
83 || defined(PT_TEXT_END_ADDR))
84 #if defined(__mcoldfire__)
85 /* These are still undefined in 3.10 kernels. */
86 #define PT_TEXT_ADDR 49*4
87 #define PT_DATA_ADDR 50*4
88 #define PT_TEXT_END_ADDR 51*4
89 /* BFIN already defines these since at least 2.6.32 kernels. */
91 #define PT_TEXT_ADDR 220
92 #define PT_TEXT_END_ADDR 224
93 #define PT_DATA_ADDR 228
94 /* These are still undefined in 3.10 kernels. */
95 #elif defined(__TMS320C6X__)
96 #define PT_TEXT_ADDR (0x10000*4)
97 #define PT_DATA_ADDR (0x10004*4)
98 #define PT_TEXT_END_ADDR (0x10008*4)
102 #ifdef HAVE_LINUX_BTRACE
103 # include "nat/linux-btrace.h"
104 # include "btrace-common.h"
107 #ifndef HAVE_ELF32_AUXV_T
108 /* Copied from glibc's elf.h. */
111 uint32_t a_type
; /* Entry type */
114 uint32_t a_val
; /* Integer value */
115 /* We use to have pointer elements added here. We cannot do that,
116 though, since it does not work when using 32-bit definitions
117 on 64-bit platforms and vice versa. */
122 #ifndef HAVE_ELF64_AUXV_T
123 /* Copied from glibc's elf.h. */
126 uint64_t a_type
; /* Entry type */
129 uint64_t a_val
; /* Integer value */
130 /* We use to have pointer elements added here. We cannot do that,
131 though, since it does not work when using 32-bit definitions
132 on 64-bit platforms and vice versa. */
137 /* Does the current host support PTRACE_GETREGSET? */
138 int have_ptrace_getregset
= -1;
142 /* See nat/linux-nat.h. */
145 ptid_of_lwp (struct lwp_info
*lwp
)
147 return ptid_of (get_lwp_thread (lwp
));
150 /* See nat/linux-nat.h. */
153 lwp_set_arch_private_info (struct lwp_info
*lwp
,
154 struct arch_lwp_info
*info
)
156 lwp
->arch_private
= info
;
159 /* See nat/linux-nat.h. */
161 struct arch_lwp_info
*
162 lwp_arch_private_info (struct lwp_info
*lwp
)
164 return lwp
->arch_private
;
167 /* See nat/linux-nat.h. */
170 lwp_is_stopped (struct lwp_info
*lwp
)
175 /* See nat/linux-nat.h. */
177 enum target_stop_reason
178 lwp_stop_reason (struct lwp_info
*lwp
)
180 return lwp
->stop_reason
;
183 /* See nat/linux-nat.h. */
186 lwp_is_stepping (struct lwp_info
*lwp
)
188 return lwp
->stepping
;
191 /* A list of all unknown processes which receive stop signals. Some
192 other process will presumably claim each of these as forked
193 children momentarily. */
195 struct simple_pid_list
197 /* The process ID. */
200 /* The status as reported by waitpid. */
204 struct simple_pid_list
*next
;
206 struct simple_pid_list
*stopped_pids
;
208 /* Trivial list manipulation functions to keep track of a list of new
209 stopped processes. */
212 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
214 struct simple_pid_list
*new_pid
= XNEW (struct simple_pid_list
);
217 new_pid
->status
= status
;
218 new_pid
->next
= *listp
;
223 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
225 struct simple_pid_list
**p
;
227 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
228 if ((*p
)->pid
== pid
)
230 struct simple_pid_list
*next
= (*p
)->next
;
232 *statusp
= (*p
)->status
;
240 enum stopping_threads_kind
242 /* Not stopping threads presently. */
243 NOT_STOPPING_THREADS
,
245 /* Stopping threads. */
248 /* Stopping and suspending threads. */
249 STOPPING_AND_SUSPENDING_THREADS
252 /* This is set while stop_all_lwps is in effect. */
253 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
255 /* FIXME make into a target method? */
256 int using_threads
= 1;
258 /* True if we're presently stabilizing threads (moving them out of
260 static int stabilizing_threads
;
262 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
263 int step
, int signal
, siginfo_t
*info
);
264 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
265 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
266 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
267 static void unsuspend_all_lwps (struct lwp_info
*except
);
268 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
269 int *wstat
, int options
);
270 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
271 static struct lwp_info
*add_lwp (ptid_t ptid
);
272 static void linux_mourn (struct process_info
*process
);
273 static int linux_stopped_by_watchpoint (void);
274 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
275 static int lwp_is_marked_dead (struct lwp_info
*lwp
);
276 static void proceed_all_lwps (void);
277 static int finish_step_over (struct lwp_info
*lwp
);
278 static int kill_lwp (unsigned long lwpid
, int signo
);
279 static void enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
);
280 static void complete_ongoing_step_over (void);
281 static int linux_low_ptrace_options (int attached
);
282 static int check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
);
283 static void proceed_one_lwp (thread_info
*thread
, lwp_info
*except
);
285 /* When the event-loop is doing a step-over, this points at the thread
287 ptid_t step_over_bkpt
;
289 /* True if the low target can hardware single-step. */
292 can_hardware_single_step (void)
294 if (the_low_target
.supports_hardware_single_step
!= NULL
)
295 return the_low_target
.supports_hardware_single_step ();
300 /* True if the low target can software single-step. Such targets
301 implement the GET_NEXT_PCS callback. */
304 can_software_single_step (void)
306 return (the_low_target
.get_next_pcs
!= NULL
);
309 /* True if the low target supports memory breakpoints. If so, we'll
310 have a GET_PC implementation. */
313 supports_breakpoints (void)
315 return (the_low_target
.get_pc
!= NULL
);
318 /* Returns true if this target can support fast tracepoints. This
319 does not mean that the in-process agent has been loaded in the
323 supports_fast_tracepoints (void)
325 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
328 /* True if LWP is stopped in its stepping range. */
331 lwp_in_step_range (struct lwp_info
*lwp
)
333 CORE_ADDR pc
= lwp
->stop_pc
;
335 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
338 struct pending_signals
342 struct pending_signals
*prev
;
345 /* The read/write ends of the pipe registered as waitable file in the
347 static int linux_event_pipe
[2] = { -1, -1 };
349 /* True if we're currently in async mode. */
350 #define target_is_async_p() (linux_event_pipe[0] != -1)
352 static void send_sigstop (struct lwp_info
*lwp
);
353 static void wait_for_sigstop (void);
355 /* Return non-zero if HEADER is a 64-bit ELF file. */
358 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
360 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
361 && header
->e_ident
[EI_MAG1
] == ELFMAG1
362 && header
->e_ident
[EI_MAG2
] == ELFMAG2
363 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
365 *machine
= header
->e_machine
;
366 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
373 /* Return non-zero if FILE is a 64-bit ELF file,
374 zero if the file is not a 64-bit ELF file,
375 and -1 if the file is not accessible or doesn't exist. */
378 elf_64_file_p (const char *file
, unsigned int *machine
)
383 fd
= open (file
, O_RDONLY
);
387 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
394 return elf_64_header_p (&header
, machine
);
397 /* Accepts an integer PID; Returns true if the executable PID is
398 running is a 64-bit ELF file.. */
401 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
405 sprintf (file
, "/proc/%d/exe", pid
);
406 return elf_64_file_p (file
, machine
);
410 delete_lwp (struct lwp_info
*lwp
)
412 struct thread_info
*thr
= get_lwp_thread (lwp
);
415 debug_printf ("deleting %ld\n", lwpid_of (thr
));
419 if (the_low_target
.delete_thread
!= NULL
)
420 the_low_target
.delete_thread (lwp
->arch_private
);
422 gdb_assert (lwp
->arch_private
== NULL
);
427 /* Add a process to the common process list, and set its private
430 static struct process_info
*
431 linux_add_process (int pid
, int attached
)
433 struct process_info
*proc
;
435 proc
= add_process (pid
, attached
);
436 proc
->priv
= XCNEW (struct process_info_private
);
438 if (the_low_target
.new_process
!= NULL
)
439 proc
->priv
->arch_private
= the_low_target
.new_process ();
444 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
446 /* Call the target arch_setup function on the current thread. */
449 linux_arch_setup (void)
451 the_low_target
.arch_setup ();
454 /* Call the target arch_setup function on THREAD. */
457 linux_arch_setup_thread (struct thread_info
*thread
)
459 struct thread_info
*saved_thread
;
461 saved_thread
= current_thread
;
462 current_thread
= thread
;
466 current_thread
= saved_thread
;
469 /* Handle a GNU/Linux extended wait response. If we see a clone,
470 fork, or vfork event, we need to add the new LWP to our list
471 (and return 0 so as not to report the trap to higher layers).
472 If we see an exec event, we will modify ORIG_EVENT_LWP to point
473 to a new LWP representing the new program. */
476 handle_extended_wait (struct lwp_info
**orig_event_lwp
, int wstat
)
478 client_state
&cs
= get_client_state ();
479 struct lwp_info
*event_lwp
= *orig_event_lwp
;
480 int event
= linux_ptrace_get_extended_event (wstat
);
481 struct thread_info
*event_thr
= get_lwp_thread (event_lwp
);
482 struct lwp_info
*new_lwp
;
484 gdb_assert (event_lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
486 /* All extended events we currently use are mid-syscall. Only
487 PTRACE_EVENT_STOP is delivered more like a signal-stop, but
488 you have to be using PTRACE_SEIZE to get that. */
489 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
491 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
492 || (event
== PTRACE_EVENT_CLONE
))
495 unsigned long new_pid
;
498 /* Get the pid of the new lwp. */
499 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
502 /* If we haven't already seen the new PID stop, wait for it now. */
503 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
505 /* The new child has a pending SIGSTOP. We can't affect it until it
506 hits the SIGSTOP, but we're already attached. */
508 ret
= my_waitpid (new_pid
, &status
, __WALL
);
511 perror_with_name ("waiting for new child");
512 else if (ret
!= new_pid
)
513 warning ("wait returned unexpected PID %d", ret
);
514 else if (!WIFSTOPPED (status
))
515 warning ("wait returned unexpected status 0x%x", status
);
518 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
520 struct process_info
*parent_proc
;
521 struct process_info
*child_proc
;
522 struct lwp_info
*child_lwp
;
523 struct thread_info
*child_thr
;
524 struct target_desc
*tdesc
;
526 ptid
= ptid_t (new_pid
, new_pid
, 0);
530 debug_printf ("HEW: Got fork event from LWP %ld, "
532 ptid_of (event_thr
).lwp (),
536 /* Add the new process to the tables and clone the breakpoint
537 lists of the parent. We need to do this even if the new process
538 will be detached, since we will need the process object and the
539 breakpoints to remove any breakpoints from memory when we
540 detach, and the client side will access registers. */
541 child_proc
= linux_add_process (new_pid
, 0);
542 gdb_assert (child_proc
!= NULL
);
543 child_lwp
= add_lwp (ptid
);
544 gdb_assert (child_lwp
!= NULL
);
545 child_lwp
->stopped
= 1;
546 child_lwp
->must_set_ptrace_flags
= 1;
547 child_lwp
->status_pending_p
= 0;
548 child_thr
= get_lwp_thread (child_lwp
);
549 child_thr
->last_resume_kind
= resume_stop
;
550 child_thr
->last_status
.kind
= TARGET_WAITKIND_STOPPED
;
552 /* If we're suspending all threads, leave this one suspended
553 too. If the fork/clone parent is stepping over a breakpoint,
554 all other threads have been suspended already. Leave the
555 child suspended too. */
556 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
557 || event_lwp
->bp_reinsert
!= 0)
560 debug_printf ("HEW: leaving child suspended\n");
561 child_lwp
->suspended
= 1;
564 parent_proc
= get_thread_process (event_thr
);
565 child_proc
->attached
= parent_proc
->attached
;
567 if (event_lwp
->bp_reinsert
!= 0
568 && can_software_single_step ()
569 && event
== PTRACE_EVENT_VFORK
)
571 /* If we leave single-step breakpoints there, child will
572 hit it, so uninsert single-step breakpoints from parent
573 (and child). Once vfork child is done, reinsert
574 them back to parent. */
575 uninsert_single_step_breakpoints (event_thr
);
578 clone_all_breakpoints (child_thr
, event_thr
);
580 tdesc
= allocate_target_description ();
581 copy_target_description (tdesc
, parent_proc
->tdesc
);
582 child_proc
->tdesc
= tdesc
;
584 /* Clone arch-specific process data. */
585 if (the_low_target
.new_fork
!= NULL
)
586 the_low_target
.new_fork (parent_proc
, child_proc
);
588 /* Save fork info in the parent thread. */
589 if (event
== PTRACE_EVENT_FORK
)
590 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
591 else if (event
== PTRACE_EVENT_VFORK
)
592 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
594 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
596 /* The status_pending field contains bits denoting the
597 extended event, so when the pending event is handled,
598 the handler will look at lwp->waitstatus. */
599 event_lwp
->status_pending_p
= 1;
600 event_lwp
->status_pending
= wstat
;
602 /* Link the threads until the parent event is passed on to
604 event_lwp
->fork_relative
= child_lwp
;
605 child_lwp
->fork_relative
= event_lwp
;
607 /* If the parent thread is doing step-over with single-step
608 breakpoints, the list of single-step breakpoints are cloned
609 from the parent's. Remove them from the child process.
610 In case of vfork, we'll reinsert them back once vforked
612 if (event_lwp
->bp_reinsert
!= 0
613 && can_software_single_step ())
615 /* The child process is forked and stopped, so it is safe
616 to access its memory without stopping all other threads
617 from other processes. */
618 delete_single_step_breakpoints (child_thr
);
620 gdb_assert (has_single_step_breakpoints (event_thr
));
621 gdb_assert (!has_single_step_breakpoints (child_thr
));
624 /* Report the event. */
629 debug_printf ("HEW: Got clone event "
630 "from LWP %ld, new child is LWP %ld\n",
631 lwpid_of (event_thr
), new_pid
);
633 ptid
= ptid_t (pid_of (event_thr
), new_pid
, 0);
634 new_lwp
= add_lwp (ptid
);
636 /* Either we're going to immediately resume the new thread
637 or leave it stopped. linux_resume_one_lwp is a nop if it
638 thinks the thread is currently running, so set this first
639 before calling linux_resume_one_lwp. */
640 new_lwp
->stopped
= 1;
642 /* If we're suspending all threads, leave this one suspended
643 too. If the fork/clone parent is stepping over a breakpoint,
644 all other threads have been suspended already. Leave the
645 child suspended too. */
646 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
647 || event_lwp
->bp_reinsert
!= 0)
648 new_lwp
->suspended
= 1;
650 /* Normally we will get the pending SIGSTOP. But in some cases
651 we might get another signal delivered to the group first.
652 If we do get another signal, be sure not to lose it. */
653 if (WSTOPSIG (status
) != SIGSTOP
)
655 new_lwp
->stop_expected
= 1;
656 new_lwp
->status_pending_p
= 1;
657 new_lwp
->status_pending
= status
;
659 else if (cs
.report_thread_events
)
661 new_lwp
->waitstatus
.kind
= TARGET_WAITKIND_THREAD_CREATED
;
662 new_lwp
->status_pending_p
= 1;
663 new_lwp
->status_pending
= status
;
667 thread_db_notice_clone (event_thr
, ptid
);
670 /* Don't report the event. */
673 else if (event
== PTRACE_EVENT_VFORK_DONE
)
675 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
677 if (event_lwp
->bp_reinsert
!= 0 && can_software_single_step ())
679 reinsert_single_step_breakpoints (event_thr
);
681 gdb_assert (has_single_step_breakpoints (event_thr
));
684 /* Report the event. */
687 else if (event
== PTRACE_EVENT_EXEC
&& cs
.report_exec_events
)
689 struct process_info
*proc
;
690 std::vector
<int> syscalls_to_catch
;
696 debug_printf ("HEW: Got exec event from LWP %ld\n",
697 lwpid_of (event_thr
));
700 /* Get the event ptid. */
701 event_ptid
= ptid_of (event_thr
);
702 event_pid
= event_ptid
.pid ();
704 /* Save the syscall list from the execing process. */
705 proc
= get_thread_process (event_thr
);
706 syscalls_to_catch
= std::move (proc
->syscalls_to_catch
);
708 /* Delete the execing process and all its threads. */
710 current_thread
= NULL
;
712 /* Create a new process/lwp/thread. */
713 proc
= linux_add_process (event_pid
, 0);
714 event_lwp
= add_lwp (event_ptid
);
715 event_thr
= get_lwp_thread (event_lwp
);
716 gdb_assert (current_thread
== event_thr
);
717 linux_arch_setup_thread (event_thr
);
719 /* Set the event status. */
720 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
721 event_lwp
->waitstatus
.value
.execd_pathname
722 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
724 /* Mark the exec status as pending. */
725 event_lwp
->stopped
= 1;
726 event_lwp
->status_pending_p
= 1;
727 event_lwp
->status_pending
= wstat
;
728 event_thr
->last_resume_kind
= resume_continue
;
729 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
731 /* Update syscall state in the new lwp, effectively mid-syscall too. */
732 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
734 /* Restore the list to catch. Don't rely on the client, which is free
735 to avoid sending a new list when the architecture doesn't change.
736 Also, for ANY_SYSCALL, the architecture doesn't really matter. */
737 proc
->syscalls_to_catch
= std::move (syscalls_to_catch
);
739 /* Report the event. */
740 *orig_event_lwp
= event_lwp
;
744 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
747 /* Return the PC as read from the regcache of LWP, without any
751 get_pc (struct lwp_info
*lwp
)
753 struct thread_info
*saved_thread
;
754 struct regcache
*regcache
;
757 if (the_low_target
.get_pc
== NULL
)
760 saved_thread
= current_thread
;
761 current_thread
= get_lwp_thread (lwp
);
763 regcache
= get_thread_regcache (current_thread
, 1);
764 pc
= (*the_low_target
.get_pc
) (regcache
);
767 debug_printf ("pc is 0x%lx\n", (long) pc
);
769 current_thread
= saved_thread
;
773 /* This function should only be called if LWP got a SYSCALL_SIGTRAP.
774 Fill *SYSNO with the syscall nr trapped. */
777 get_syscall_trapinfo (struct lwp_info
*lwp
, int *sysno
)
779 struct thread_info
*saved_thread
;
780 struct regcache
*regcache
;
782 if (the_low_target
.get_syscall_trapinfo
== NULL
)
784 /* If we cannot get the syscall trapinfo, report an unknown
785 system call number. */
786 *sysno
= UNKNOWN_SYSCALL
;
790 saved_thread
= current_thread
;
791 current_thread
= get_lwp_thread (lwp
);
793 regcache
= get_thread_regcache (current_thread
, 1);
794 (*the_low_target
.get_syscall_trapinfo
) (regcache
, sysno
);
797 debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno
);
799 current_thread
= saved_thread
;
802 static int check_stopped_by_watchpoint (struct lwp_info
*child
);
804 /* Called when the LWP stopped for a signal/trap. If it stopped for a
805 trap check what caused it (breakpoint, watchpoint, trace, etc.),
806 and save the result in the LWP's stop_reason field. If it stopped
807 for a breakpoint, decrement the PC if necessary on the lwp's
808 architecture. Returns true if we now have the LWP's stop PC. */
811 save_stop_reason (struct lwp_info
*lwp
)
814 CORE_ADDR sw_breakpoint_pc
;
815 struct thread_info
*saved_thread
;
816 #if USE_SIGTRAP_SIGINFO
820 if (the_low_target
.get_pc
== NULL
)
824 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
826 /* breakpoint_at reads from the current thread. */
827 saved_thread
= current_thread
;
828 current_thread
= get_lwp_thread (lwp
);
830 #if USE_SIGTRAP_SIGINFO
831 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
832 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
834 if (siginfo
.si_signo
== SIGTRAP
)
836 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
)
837 && GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
839 /* The si_code is ambiguous on this arch -- check debug
841 if (!check_stopped_by_watchpoint (lwp
))
842 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
844 else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
846 /* If we determine the LWP stopped for a SW breakpoint,
847 trust it. Particularly don't check watchpoint
848 registers, because at least on s390, we'd find
849 stopped-by-watchpoint as long as there's a watchpoint
851 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
853 else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
855 /* This can indicate either a hardware breakpoint or
856 hardware watchpoint. Check debug registers. */
857 if (!check_stopped_by_watchpoint (lwp
))
858 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
860 else if (siginfo
.si_code
== TRAP_TRACE
)
862 /* We may have single stepped an instruction that
863 triggered a watchpoint. In that case, on some
864 architectures (such as x86), instead of TRAP_HWBKPT,
865 si_code indicates TRAP_TRACE, and we need to check
866 the debug registers separately. */
867 if (!check_stopped_by_watchpoint (lwp
))
868 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
873 /* We may have just stepped a breakpoint instruction. E.g., in
874 non-stop mode, GDB first tells the thread A to step a range, and
875 then the user inserts a breakpoint inside the range. In that
876 case we need to report the breakpoint PC. */
877 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
878 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
879 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
881 if (hardware_breakpoint_inserted_here (pc
))
882 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
884 if (lwp
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
)
885 check_stopped_by_watchpoint (lwp
);
888 if (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
892 struct thread_info
*thr
= get_lwp_thread (lwp
);
894 debug_printf ("CSBB: %s stopped by software breakpoint\n",
895 target_pid_to_str (ptid_of (thr
)));
898 /* Back up the PC if necessary. */
899 if (pc
!= sw_breakpoint_pc
)
901 struct regcache
*regcache
902 = get_thread_regcache (current_thread
, 1);
903 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
906 /* Update this so we record the correct stop PC below. */
907 pc
= sw_breakpoint_pc
;
909 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
)
913 struct thread_info
*thr
= get_lwp_thread (lwp
);
915 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
916 target_pid_to_str (ptid_of (thr
)));
919 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
923 struct thread_info
*thr
= get_lwp_thread (lwp
);
925 debug_printf ("CSBB: %s stopped by hardware watchpoint\n",
926 target_pid_to_str (ptid_of (thr
)));
929 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
)
933 struct thread_info
*thr
= get_lwp_thread (lwp
);
935 debug_printf ("CSBB: %s stopped by trace\n",
936 target_pid_to_str (ptid_of (thr
)));
941 current_thread
= saved_thread
;
945 static struct lwp_info
*
946 add_lwp (ptid_t ptid
)
948 struct lwp_info
*lwp
;
950 lwp
= XCNEW (struct lwp_info
);
952 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
954 if (the_low_target
.new_thread
!= NULL
)
955 the_low_target
.new_thread (lwp
);
957 lwp
->thread
= add_thread (ptid
, lwp
);
962 /* Callback to be used when calling fork_inferior, responsible for
963 actually initiating the tracing of the inferior. */
968 if (ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0,
969 (PTRACE_TYPE_ARG4
) 0) < 0)
970 trace_start_error_with_name ("ptrace");
972 if (setpgid (0, 0) < 0)
973 trace_start_error_with_name ("setpgid");
975 /* If GDBserver is connected to gdb via stdio, redirect the inferior's
976 stdout to stderr so that inferior i/o doesn't corrupt the connection.
977 Also, redirect stdin to /dev/null. */
978 if (remote_connection_is_stdio ())
981 trace_start_error_with_name ("close");
982 if (open ("/dev/null", O_RDONLY
) < 0)
983 trace_start_error_with_name ("open");
985 trace_start_error_with_name ("dup2");
986 if (write (2, "stdin/stdout redirected\n",
987 sizeof ("stdin/stdout redirected\n") - 1) < 0)
989 /* Errors ignored. */;
994 /* Start an inferior process and returns its pid.
995 PROGRAM is the name of the program to be started, and PROGRAM_ARGS
996 are its arguments. */
999 linux_create_inferior (const char *program
,
1000 const std::vector
<char *> &program_args
)
1002 client_state
&cs
= get_client_state ();
1003 struct lwp_info
*new_lwp
;
1008 maybe_disable_address_space_randomization restore_personality
1009 (cs
.disable_randomization
);
1010 std::string str_program_args
= stringify_argv (program_args
);
1012 pid
= fork_inferior (program
,
1013 str_program_args
.c_str (),
1014 get_environ ()->envp (), linux_ptrace_fun
,
1015 NULL
, NULL
, NULL
, NULL
);
1018 linux_add_process (pid
, 0);
1020 ptid
= ptid_t (pid
, pid
, 0);
1021 new_lwp
= add_lwp (ptid
);
1022 new_lwp
->must_set_ptrace_flags
= 1;
1024 post_fork_inferior (pid
, program
);
1029 /* Implement the post_create_inferior target_ops method. */
1032 linux_post_create_inferior (void)
1034 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
1036 linux_arch_setup ();
1038 if (lwp
->must_set_ptrace_flags
)
1040 struct process_info
*proc
= current_process ();
1041 int options
= linux_low_ptrace_options (proc
->attached
);
1043 linux_enable_event_reporting (lwpid_of (current_thread
), options
);
1044 lwp
->must_set_ptrace_flags
= 0;
1048 /* Attach to an inferior process. Returns 0 on success, ERRNO on
1052 linux_attach_lwp (ptid_t ptid
)
1054 struct lwp_info
*new_lwp
;
1055 int lwpid
= ptid
.lwp ();
1057 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
1061 new_lwp
= add_lwp (ptid
);
1063 /* We need to wait for SIGSTOP before being able to make the next
1064 ptrace call on this LWP. */
1065 new_lwp
->must_set_ptrace_flags
= 1;
1067 if (linux_proc_pid_is_stopped (lwpid
))
1070 debug_printf ("Attached to a stopped process\n");
1072 /* The process is definitely stopped. It is in a job control
1073 stop, unless the kernel predates the TASK_STOPPED /
1074 TASK_TRACED distinction, in which case it might be in a
1075 ptrace stop. Make sure it is in a ptrace stop; from there we
1076 can kill it, signal it, et cetera.
1078 First make sure there is a pending SIGSTOP. Since we are
1079 already attached, the process can not transition from stopped
1080 to running without a PTRACE_CONT; so we know this signal will
1081 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1082 probably already in the queue (unless this kernel is old
1083 enough to use TASK_STOPPED for ptrace stops); but since
1084 SIGSTOP is not an RT signal, it can only be queued once. */
1085 kill_lwp (lwpid
, SIGSTOP
);
1087 /* Finally, resume the stopped process. This will deliver the
1088 SIGSTOP (or a higher priority signal, just like normal
1089 PTRACE_ATTACH), which we'll catch later on. */
1090 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1093 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
1094 brings it to a halt.
1096 There are several cases to consider here:
1098 1) gdbserver has already attached to the process and is being notified
1099 of a new thread that is being created.
1100 In this case we should ignore that SIGSTOP and resume the
1101 process. This is handled below by setting stop_expected = 1,
1102 and the fact that add_thread sets last_resume_kind ==
1105 2) This is the first thread (the process thread), and we're attaching
1106 to it via attach_inferior.
1107 In this case we want the process thread to stop.
1108 This is handled by having linux_attach set last_resume_kind ==
1109 resume_stop after we return.
1111 If the pid we are attaching to is also the tgid, we attach to and
1112 stop all the existing threads. Otherwise, we attach to pid and
1113 ignore any other threads in the same group as this pid.
1115 3) GDB is connecting to gdbserver and is requesting an enumeration of all
1117 In this case we want the thread to stop.
1118 FIXME: This case is currently not properly handled.
1119 We should wait for the SIGSTOP but don't. Things work apparently
1120 because enough time passes between when we ptrace (ATTACH) and when
1121 gdb makes the next ptrace call on the thread.
1123 On the other hand, if we are currently trying to stop all threads, we
1124 should treat the new thread as if we had sent it a SIGSTOP. This works
1125 because we are guaranteed that the add_lwp call above added us to the
1126 end of the list, and so the new thread has not yet reached
1127 wait_for_sigstop (but will). */
1128 new_lwp
->stop_expected
= 1;
1133 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
1134 already attached. Returns true if a new LWP is found, false
1138 attach_proc_task_lwp_callback (ptid_t ptid
)
1140 /* Is this a new thread? */
1141 if (find_thread_ptid (ptid
) == NULL
)
1143 int lwpid
= ptid
.lwp ();
1147 debug_printf ("Found new lwp %d\n", lwpid
);
1149 err
= linux_attach_lwp (ptid
);
1151 /* Be quiet if we simply raced with the thread exiting. EPERM
1152 is returned if the thread's task still exists, and is marked
1153 as exited or zombie, as well as other conditions, so in that
1154 case, confirm the status in /proc/PID/status. */
1156 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1160 debug_printf ("Cannot attach to lwp %d: "
1161 "thread is gone (%d: %s)\n",
1162 lwpid
, err
, strerror (err
));
1168 = linux_ptrace_attach_fail_reason_string (ptid
, err
);
1170 warning (_("Cannot attach to lwp %d: %s"), lwpid
, reason
.c_str ());
1178 static void async_file_mark (void);
1180 /* Attach to PID. If PID is the tgid, attach to it and all
1184 linux_attach (unsigned long pid
)
1186 struct process_info
*proc
;
1187 struct thread_info
*initial_thread
;
1188 ptid_t ptid
= ptid_t (pid
, pid
, 0);
1191 /* Attach to PID. We will check for other threads
1193 err
= linux_attach_lwp (ptid
);
1196 std::string reason
= linux_ptrace_attach_fail_reason_string (ptid
, err
);
1198 error ("Cannot attach to process %ld: %s", pid
, reason
.c_str ());
1201 proc
= linux_add_process (pid
, 1);
1203 /* Don't ignore the initial SIGSTOP if we just attached to this
1204 process. It will be collected by wait shortly. */
1205 initial_thread
= find_thread_ptid (ptid_t (pid
, pid
, 0));
1206 initial_thread
->last_resume_kind
= resume_stop
;
1208 /* We must attach to every LWP. If /proc is mounted, use that to
1209 find them now. On the one hand, the inferior may be using raw
1210 clone instead of using pthreads. On the other hand, even if it
1211 is using pthreads, GDB may not be connected yet (thread_db needs
1212 to do symbol lookups, through qSymbol). Also, thread_db walks
1213 structures in the inferior's address space to find the list of
1214 threads/LWPs, and those structures may well be corrupted. Note
1215 that once thread_db is loaded, we'll still use it to list threads
1216 and associate pthread info with each LWP. */
1217 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1219 /* GDB will shortly read the xml target description for this
1220 process, to figure out the process' architecture. But the target
1221 description is only filled in when the first process/thread in
1222 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1223 that now, otherwise, if GDB is fast enough, it could read the
1224 target description _before_ that initial stop. */
1227 struct lwp_info
*lwp
;
1229 ptid_t pid_ptid
= ptid_t (pid
);
1231 lwpid
= linux_wait_for_event_filtered (pid_ptid
, pid_ptid
,
1233 gdb_assert (lwpid
> 0);
1235 lwp
= find_lwp_pid (ptid_t (lwpid
));
1237 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGSTOP
)
1239 lwp
->status_pending_p
= 1;
1240 lwp
->status_pending
= wstat
;
1243 initial_thread
->last_resume_kind
= resume_continue
;
1247 gdb_assert (proc
->tdesc
!= NULL
);
1254 last_thread_of_process_p (int pid
)
1256 bool seen_one
= false;
1258 thread_info
*thread
= find_thread (pid
, [&] (thread_info
*thread
)
1262 /* This is the first thread of this process we see. */
1268 /* This is the second thread of this process we see. */
1273 return thread
== NULL
;
1279 linux_kill_one_lwp (struct lwp_info
*lwp
)
1281 struct thread_info
*thr
= get_lwp_thread (lwp
);
1282 int pid
= lwpid_of (thr
);
1284 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1285 there is no signal context, and ptrace(PTRACE_KILL) (or
1286 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1287 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1288 alternative is to kill with SIGKILL. We only need one SIGKILL
1289 per process, not one for each thread. But since we still support
1290 support debugging programs using raw clone without CLONE_THREAD,
1291 we send one for each thread. For years, we used PTRACE_KILL
1292 only, so we're being a bit paranoid about some old kernels where
1293 PTRACE_KILL might work better (dubious if there are any such, but
1294 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1295 second, and so we're fine everywhere. */
1298 kill_lwp (pid
, SIGKILL
);
1301 int save_errno
= errno
;
1303 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1304 target_pid_to_str (ptid_of (thr
)),
1305 save_errno
? strerror (save_errno
) : "OK");
1309 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1312 int save_errno
= errno
;
1314 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1315 target_pid_to_str (ptid_of (thr
)),
1316 save_errno
? strerror (save_errno
) : "OK");
1320 /* Kill LWP and wait for it to die. */
1323 kill_wait_lwp (struct lwp_info
*lwp
)
1325 struct thread_info
*thr
= get_lwp_thread (lwp
);
1326 int pid
= ptid_of (thr
).pid ();
1327 int lwpid
= ptid_of (thr
).lwp ();
1332 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1336 linux_kill_one_lwp (lwp
);
1338 /* Make sure it died. Notes:
1340 - The loop is most likely unnecessary.
1342 - We don't use linux_wait_for_event as that could delete lwps
1343 while we're iterating over them. We're not interested in
1344 any pending status at this point, only in making sure all
1345 wait status on the kernel side are collected until the
1348 - We don't use __WALL here as the __WALL emulation relies on
1349 SIGCHLD, and killing a stopped process doesn't generate
1350 one, nor an exit status.
1352 res
= my_waitpid (lwpid
, &wstat
, 0);
1353 if (res
== -1 && errno
== ECHILD
)
1354 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1355 } while (res
> 0 && WIFSTOPPED (wstat
));
1357 /* Even if it was stopped, the child may have already disappeared.
1358 E.g., if it was killed by SIGKILL. */
1359 if (res
< 0 && errno
!= ECHILD
)
1360 perror_with_name ("kill_wait_lwp");
1363 /* Callback for `for_each_thread'. Kills an lwp of a given process,
1364 except the leader. */
1367 kill_one_lwp_callback (thread_info
*thread
, int pid
)
1369 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1371 /* We avoid killing the first thread here, because of a Linux kernel (at
1372 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1373 the children get a chance to be reaped, it will remain a zombie
1376 if (lwpid_of (thread
) == pid
)
1379 debug_printf ("lkop: is last of process %s\n",
1380 target_pid_to_str (thread
->id
));
1384 kill_wait_lwp (lwp
);
1388 linux_kill (int pid
)
1390 struct process_info
*process
;
1391 struct lwp_info
*lwp
;
1393 process
= find_process_pid (pid
);
1394 if (process
== NULL
)
1397 /* If we're killing a running inferior, make sure it is stopped
1398 first, as PTRACE_KILL will not work otherwise. */
1399 stop_all_lwps (0, NULL
);
1401 for_each_thread (pid
, [&] (thread_info
*thread
)
1403 kill_one_lwp_callback (thread
, pid
);
1406 /* See the comment in linux_kill_one_lwp. We did not kill the first
1407 thread in the list, so do so now. */
1408 lwp
= find_lwp_pid (ptid_t (pid
));
1413 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1417 kill_wait_lwp (lwp
);
1419 the_target
->mourn (process
);
1421 /* Since we presently can only stop all lwps of all processes, we
1422 need to unstop lwps of other processes. */
1423 unstop_all_lwps (0, NULL
);
1427 /* Get pending signal of THREAD, for detaching purposes. This is the
1428 signal the thread last stopped for, which we need to deliver to the
1429 thread when detaching, otherwise, it'd be suppressed/lost. */
1432 get_detach_signal (struct thread_info
*thread
)
1434 client_state
&cs
= get_client_state ();
1435 enum gdb_signal signo
= GDB_SIGNAL_0
;
1437 struct lwp_info
*lp
= get_thread_lwp (thread
);
1439 if (lp
->status_pending_p
)
1440 status
= lp
->status_pending
;
1443 /* If the thread had been suspended by gdbserver, and it stopped
1444 cleanly, then it'll have stopped with SIGSTOP. But we don't
1445 want to deliver that SIGSTOP. */
1446 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1447 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1450 /* Otherwise, we may need to deliver the signal we
1452 status
= lp
->last_status
;
1455 if (!WIFSTOPPED (status
))
1458 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1459 target_pid_to_str (ptid_of (thread
)));
1463 /* Extended wait statuses aren't real SIGTRAPs. */
1464 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1467 debug_printf ("GPS: lwp %s had stopped with extended "
1468 "status: no pending signal\n",
1469 target_pid_to_str (ptid_of (thread
)));
1473 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1475 if (cs
.program_signals_p
&& !cs
.program_signals
[signo
])
1478 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1479 target_pid_to_str (ptid_of (thread
)),
1480 gdb_signal_to_string (signo
));
1483 else if (!cs
.program_signals_p
1484 /* If we have no way to know which signals GDB does not
1485 want to have passed to the program, assume
1486 SIGTRAP/SIGINT, which is GDB's default. */
1487 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1490 debug_printf ("GPS: lwp %s had signal %s, "
1491 "but we don't know if we should pass it. "
1492 "Default to not.\n",
1493 target_pid_to_str (ptid_of (thread
)),
1494 gdb_signal_to_string (signo
));
1500 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1501 target_pid_to_str (ptid_of (thread
)),
1502 gdb_signal_to_string (signo
));
1504 return WSTOPSIG (status
);
1508 /* Detach from LWP. */
1511 linux_detach_one_lwp (struct lwp_info
*lwp
)
1513 struct thread_info
*thread
= get_lwp_thread (lwp
);
1517 /* If there is a pending SIGSTOP, get rid of it. */
1518 if (lwp
->stop_expected
)
1521 debug_printf ("Sending SIGCONT to %s\n",
1522 target_pid_to_str (ptid_of (thread
)));
1524 kill_lwp (lwpid_of (thread
), SIGCONT
);
1525 lwp
->stop_expected
= 0;
1528 /* Pass on any pending signal for this thread. */
1529 sig
= get_detach_signal (thread
);
1531 /* Preparing to resume may try to write registers, and fail if the
1532 lwp is zombie. If that happens, ignore the error. We'll handle
1533 it below, when detach fails with ESRCH. */
1536 /* Flush any pending changes to the process's registers. */
1537 regcache_invalidate_thread (thread
);
1539 /* Finally, let it resume. */
1540 if (the_low_target
.prepare_to_resume
!= NULL
)
1541 the_low_target
.prepare_to_resume (lwp
);
1543 CATCH (ex
, RETURN_MASK_ERROR
)
1545 if (!check_ptrace_stopped_lwp_gone (lwp
))
1546 throw_exception (ex
);
1550 lwpid
= lwpid_of (thread
);
1551 if (ptrace (PTRACE_DETACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0,
1552 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1554 int save_errno
= errno
;
1556 /* We know the thread exists, so ESRCH must mean the lwp is
1557 zombie. This can happen if one of the already-detached
1558 threads exits the whole thread group. In that case we're
1559 still attached, and must reap the lwp. */
1560 if (save_errno
== ESRCH
)
1564 ret
= my_waitpid (lwpid
, &status
, __WALL
);
1567 warning (_("Couldn't reap LWP %d while detaching: %s"),
1568 lwpid
, strerror (errno
));
1570 else if (!WIFEXITED (status
) && !WIFSIGNALED (status
))
1572 warning (_("Reaping LWP %d while detaching "
1573 "returned unexpected status 0x%x"),
1579 error (_("Can't detach %s: %s"),
1580 target_pid_to_str (ptid_of (thread
)),
1581 strerror (save_errno
));
1584 else if (debug_threads
)
1586 debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n",
1587 target_pid_to_str (ptid_of (thread
)),
1594 /* Callback for for_each_thread. Detaches from non-leader threads of a
1598 linux_detach_lwp_callback (thread_info
*thread
)
1600 /* We don't actually detach from the thread group leader just yet.
1601 If the thread group exits, we must reap the zombie clone lwps
1602 before we're able to reap the leader. */
1603 if (thread
->id
.pid () == thread
->id
.lwp ())
1606 lwp_info
*lwp
= get_thread_lwp (thread
);
1607 linux_detach_one_lwp (lwp
);
1611 linux_detach (process_info
*process
)
1613 struct lwp_info
*main_lwp
;
1615 /* As there's a step over already in progress, let it finish first,
1616 otherwise nesting a stabilize_threads operation on top gets real
1618 complete_ongoing_step_over ();
1620 /* Stop all threads before detaching. First, ptrace requires that
1621 the thread is stopped to sucessfully detach. Second, thread_db
1622 may need to uninstall thread event breakpoints from memory, which
1623 only works with a stopped process anyway. */
1624 stop_all_lwps (0, NULL
);
1626 #ifdef USE_THREAD_DB
1627 thread_db_detach (process
);
1630 /* Stabilize threads (move out of jump pads). */
1631 stabilize_threads ();
1633 /* Detach from the clone lwps first. If the thread group exits just
1634 while we're detaching, we must reap the clone lwps before we're
1635 able to reap the leader. */
1636 for_each_thread (process
->pid
, linux_detach_lwp_callback
);
1638 main_lwp
= find_lwp_pid (ptid_t (process
->pid
));
1639 linux_detach_one_lwp (main_lwp
);
1641 the_target
->mourn (process
);
1643 /* Since we presently can only stop all lwps of all processes, we
1644 need to unstop lwps of other processes. */
1645 unstop_all_lwps (0, NULL
);
1649 /* Remove all LWPs that belong to process PROC from the lwp list. */
1652 linux_mourn (struct process_info
*process
)
1654 struct process_info_private
*priv
;
1656 #ifdef USE_THREAD_DB
1657 thread_db_mourn (process
);
1660 for_each_thread (process
->pid
, [] (thread_info
*thread
)
1662 delete_lwp (get_thread_lwp (thread
));
1665 /* Freeing all private data. */
1666 priv
= process
->priv
;
1667 if (the_low_target
.delete_process
!= NULL
)
1668 the_low_target
.delete_process (priv
->arch_private
);
1670 gdb_assert (priv
->arch_private
== NULL
);
1672 process
->priv
= NULL
;
1674 remove_process (process
);
1678 linux_join (process_info
*proc
)
1683 ret
= my_waitpid (proc
->pid
, &status
, 0);
1684 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1686 } while (ret
!= -1 || errno
!= ECHILD
);
1689 /* Return nonzero if the given thread is still alive. */
1691 linux_thread_alive (ptid_t ptid
)
1693 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1695 /* We assume we always know if a thread exits. If a whole process
1696 exited but we still haven't been able to report it to GDB, we'll
1697 hold on to the last lwp of the dead process. */
1699 return !lwp_is_marked_dead (lwp
);
1704 /* Return 1 if this lwp still has an interesting status pending. If
1705 not (e.g., it had stopped for a breakpoint that is gone), return
1709 thread_still_has_status_pending_p (struct thread_info
*thread
)
1711 struct lwp_info
*lp
= get_thread_lwp (thread
);
1713 if (!lp
->status_pending_p
)
1716 if (thread
->last_resume_kind
!= resume_stop
1717 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1718 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1720 struct thread_info
*saved_thread
;
1724 gdb_assert (lp
->last_status
!= 0);
1728 saved_thread
= current_thread
;
1729 current_thread
= thread
;
1731 if (pc
!= lp
->stop_pc
)
1734 debug_printf ("PC of %ld changed\n",
1739 #if !USE_SIGTRAP_SIGINFO
1740 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1741 && !(*the_low_target
.breakpoint_at
) (pc
))
1744 debug_printf ("previous SW breakpoint of %ld gone\n",
1748 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1749 && !hardware_breakpoint_inserted_here (pc
))
1752 debug_printf ("previous HW breakpoint of %ld gone\n",
1758 current_thread
= saved_thread
;
1763 debug_printf ("discarding pending breakpoint status\n");
1764 lp
->status_pending_p
= 0;
1772 /* Returns true if LWP is resumed from the client's perspective. */
1775 lwp_resumed (struct lwp_info
*lwp
)
1777 struct thread_info
*thread
= get_lwp_thread (lwp
);
1779 if (thread
->last_resume_kind
!= resume_stop
)
1782 /* Did gdb send us a `vCont;t', but we haven't reported the
1783 corresponding stop to gdb yet? If so, the thread is still
1784 resumed/running from gdb's perspective. */
1785 if (thread
->last_resume_kind
== resume_stop
1786 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1792 /* Return true if this lwp has an interesting status pending. */
1794 status_pending_p_callback (thread_info
*thread
, ptid_t ptid
)
1796 struct lwp_info
*lp
= get_thread_lwp (thread
);
1798 /* Check if we're only interested in events from a specific process
1799 or a specific LWP. */
1800 if (!thread
->id
.matches (ptid
))
1803 if (!lwp_resumed (lp
))
1806 if (lp
->status_pending_p
1807 && !thread_still_has_status_pending_p (thread
))
1809 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1813 return lp
->status_pending_p
;
1817 find_lwp_pid (ptid_t ptid
)
1819 thread_info
*thread
= find_thread ([&] (thread_info
*thread
)
1821 int lwp
= ptid
.lwp () != 0 ? ptid
.lwp () : ptid
.pid ();
1822 return thread
->id
.lwp () == lwp
;
1828 return get_thread_lwp (thread
);
1831 /* Return the number of known LWPs in the tgid given by PID. */
1838 for_each_thread (pid
, [&] (thread_info
*thread
)
1846 /* See nat/linux-nat.h. */
1849 iterate_over_lwps (ptid_t filter
,
1850 iterate_over_lwps_ftype callback
,
1853 thread_info
*thread
= find_thread (filter
, [&] (thread_info
*thread
)
1855 lwp_info
*lwp
= get_thread_lwp (thread
);
1857 return callback (lwp
, data
);
1863 return get_thread_lwp (thread
);
1866 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1867 their exits until all other threads in the group have exited. */
1870 check_zombie_leaders (void)
1872 for_each_process ([] (process_info
*proc
) {
1873 pid_t leader_pid
= pid_of (proc
);
1874 struct lwp_info
*leader_lp
;
1876 leader_lp
= find_lwp_pid (ptid_t (leader_pid
));
1879 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1880 "num_lwps=%d, zombie=%d\n",
1881 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1882 linux_proc_pid_is_zombie (leader_pid
));
1884 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1885 /* Check if there are other threads in the group, as we may
1886 have raced with the inferior simply exiting. */
1887 && !last_thread_of_process_p (leader_pid
)
1888 && linux_proc_pid_is_zombie (leader_pid
))
1890 /* A leader zombie can mean one of two things:
1892 - It exited, and there's an exit status pending
1893 available, or only the leader exited (not the whole
1894 program). In the latter case, we can't waitpid the
1895 leader's exit status until all other threads are gone.
1897 - There are 3 or more threads in the group, and a thread
1898 other than the leader exec'd. On an exec, the Linux
1899 kernel destroys all other threads (except the execing
1900 one) in the thread group, and resets the execing thread's
1901 tid to the tgid. No exit notification is sent for the
1902 execing thread -- from the ptracer's perspective, it
1903 appears as though the execing thread just vanishes.
1904 Until we reap all other threads except the leader and the
1905 execing thread, the leader will be zombie, and the
1906 execing thread will be in `D (disc sleep)'. As soon as
1907 all other threads are reaped, the execing thread changes
1908 it's tid to the tgid, and the previous (zombie) leader
1909 vanishes, giving place to the "new" leader. We could try
1910 distinguishing the exit and exec cases, by waiting once
1911 more, and seeing if something comes out, but it doesn't
1912 sound useful. The previous leader _does_ go away, and
1913 we'll re-add the new one once we see the exec event
1914 (which is just the same as what would happen if the
1915 previous leader did exit voluntarily before some other
1919 debug_printf ("CZL: Thread group leader %d zombie "
1920 "(it exited, or another thread execd).\n",
1923 delete_lwp (leader_lp
);
1928 /* Callback for `find_thread'. Returns the first LWP that is not
1932 not_stopped_callback (thread_info
*thread
, ptid_t filter
)
1934 if (!thread
->id
.matches (filter
))
1937 lwp_info
*lwp
= get_thread_lwp (thread
);
1939 return !lwp
->stopped
;
1942 /* Increment LWP's suspend count. */
1945 lwp_suspended_inc (struct lwp_info
*lwp
)
1949 if (debug_threads
&& lwp
->suspended
> 4)
1951 struct thread_info
*thread
= get_lwp_thread (lwp
);
1953 debug_printf ("LWP %ld has a suspiciously high suspend count,"
1954 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
1958 /* Decrement LWP's suspend count. */
1961 lwp_suspended_decr (struct lwp_info
*lwp
)
1965 if (lwp
->suspended
< 0)
1967 struct thread_info
*thread
= get_lwp_thread (lwp
);
1969 internal_error (__FILE__
, __LINE__
,
1970 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
1975 /* This function should only be called if the LWP got a SIGTRAP.
1977 Handle any tracepoint steps or hits. Return true if a tracepoint
1978 event was handled, 0 otherwise. */
1981 handle_tracepoints (struct lwp_info
*lwp
)
1983 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1984 int tpoint_related_event
= 0;
1986 gdb_assert (lwp
->suspended
== 0);
1988 /* If this tracepoint hit causes a tracing stop, we'll immediately
1989 uninsert tracepoints. To do this, we temporarily pause all
1990 threads, unpatch away, and then unpause threads. We need to make
1991 sure the unpausing doesn't resume LWP too. */
1992 lwp_suspended_inc (lwp
);
1994 /* And we need to be sure that any all-threads-stopping doesn't try
1995 to move threads out of the jump pads, as it could deadlock the
1996 inferior (LWP could be in the jump pad, maybe even holding the
1999 /* Do any necessary step collect actions. */
2000 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2002 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2004 /* See if we just hit a tracepoint and do its main collect
2006 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2008 lwp_suspended_decr (lwp
);
2010 gdb_assert (lwp
->suspended
== 0);
2011 gdb_assert (!stabilizing_threads
2012 || (lwp
->collecting_fast_tracepoint
2013 != fast_tpoint_collect_result::not_collecting
));
2015 if (tpoint_related_event
)
2018 debug_printf ("got a tracepoint event\n");
2025 /* Convenience wrapper. Returns information about LWP's fast tracepoint
2026 collection status. */
2028 static fast_tpoint_collect_result
2029 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2030 struct fast_tpoint_collect_status
*status
)
2032 CORE_ADDR thread_area
;
2033 struct thread_info
*thread
= get_lwp_thread (lwp
);
2035 if (the_low_target
.get_thread_area
== NULL
)
2036 return fast_tpoint_collect_result::not_collecting
;
2038 /* Get the thread area address. This is used to recognize which
2039 thread is which when tracing with the in-process agent library.
2040 We don't read anything from the address, and treat it as opaque;
2041 it's the address itself that we assume is unique per-thread. */
2042 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2043 return fast_tpoint_collect_result::not_collecting
;
2045 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2048 /* The reason we resume in the caller, is because we want to be able
2049 to pass lwp->status_pending as WSTAT, and we need to clear
2050 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2051 refuses to resume. */
2054 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2056 struct thread_info
*saved_thread
;
2058 saved_thread
= current_thread
;
2059 current_thread
= get_lwp_thread (lwp
);
2062 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2063 && supports_fast_tracepoints ()
2064 && agent_loaded_p ())
2066 struct fast_tpoint_collect_status status
;
2069 debug_printf ("Checking whether LWP %ld needs to move out of the "
2071 lwpid_of (current_thread
));
2073 fast_tpoint_collect_result r
2074 = linux_fast_tracepoint_collecting (lwp
, &status
);
2077 || (WSTOPSIG (*wstat
) != SIGILL
2078 && WSTOPSIG (*wstat
) != SIGFPE
2079 && WSTOPSIG (*wstat
) != SIGSEGV
2080 && WSTOPSIG (*wstat
) != SIGBUS
))
2082 lwp
->collecting_fast_tracepoint
= r
;
2084 if (r
!= fast_tpoint_collect_result::not_collecting
)
2086 if (r
== fast_tpoint_collect_result::before_insn
2087 && lwp
->exit_jump_pad_bkpt
== NULL
)
2089 /* Haven't executed the original instruction yet.
2090 Set breakpoint there, and wait till it's hit,
2091 then single-step until exiting the jump pad. */
2092 lwp
->exit_jump_pad_bkpt
2093 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2097 debug_printf ("Checking whether LWP %ld needs to move out of "
2098 "the jump pad...it does\n",
2099 lwpid_of (current_thread
));
2100 current_thread
= saved_thread
;
2107 /* If we get a synchronous signal while collecting, *and*
2108 while executing the (relocated) original instruction,
2109 reset the PC to point at the tpoint address, before
2110 reporting to GDB. Otherwise, it's an IPA lib bug: just
2111 report the signal to GDB, and pray for the best. */
2113 lwp
->collecting_fast_tracepoint
2114 = fast_tpoint_collect_result::not_collecting
;
2116 if (r
!= fast_tpoint_collect_result::not_collecting
2117 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2118 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2121 struct regcache
*regcache
;
2123 /* The si_addr on a few signals references the address
2124 of the faulting instruction. Adjust that as
2126 if ((WSTOPSIG (*wstat
) == SIGILL
2127 || WSTOPSIG (*wstat
) == SIGFPE
2128 || WSTOPSIG (*wstat
) == SIGBUS
2129 || WSTOPSIG (*wstat
) == SIGSEGV
)
2130 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2131 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2132 /* Final check just to make sure we don't clobber
2133 the siginfo of non-kernel-sent signals. */
2134 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2136 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2137 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2138 (PTRACE_TYPE_ARG3
) 0, &info
);
2141 regcache
= get_thread_regcache (current_thread
, 1);
2142 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2143 lwp
->stop_pc
= status
.tpoint_addr
;
2145 /* Cancel any fast tracepoint lock this thread was
2147 force_unlock_trace_buffer ();
2150 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2153 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2154 "stopping all threads momentarily.\n");
2156 stop_all_lwps (1, lwp
);
2158 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2159 lwp
->exit_jump_pad_bkpt
= NULL
;
2161 unstop_all_lwps (1, lwp
);
2163 gdb_assert (lwp
->suspended
>= 0);
2169 debug_printf ("Checking whether LWP %ld needs to move out of the "
2171 lwpid_of (current_thread
));
2173 current_thread
= saved_thread
;
2177 /* Enqueue one signal in the "signals to report later when out of the
2181 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2183 struct pending_signals
*p_sig
;
2184 struct thread_info
*thread
= get_lwp_thread (lwp
);
2187 debug_printf ("Deferring signal %d for LWP %ld.\n",
2188 WSTOPSIG (*wstat
), lwpid_of (thread
));
2192 struct pending_signals
*sig
;
2194 for (sig
= lwp
->pending_signals_to_report
;
2197 debug_printf (" Already queued %d\n",
2200 debug_printf (" (no more currently queued signals)\n");
2203 /* Don't enqueue non-RT signals if they are already in the deferred
2204 queue. (SIGSTOP being the easiest signal to see ending up here
2206 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2208 struct pending_signals
*sig
;
2210 for (sig
= lwp
->pending_signals_to_report
;
2214 if (sig
->signal
== WSTOPSIG (*wstat
))
2217 debug_printf ("Not requeuing already queued non-RT signal %d"
2226 p_sig
= XCNEW (struct pending_signals
);
2227 p_sig
->prev
= lwp
->pending_signals_to_report
;
2228 p_sig
->signal
= WSTOPSIG (*wstat
);
2230 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2233 lwp
->pending_signals_to_report
= p_sig
;
2236 /* Dequeue one signal from the "signals to report later when out of
2237 the jump pad" list. */
2240 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2242 struct thread_info
*thread
= get_lwp_thread (lwp
);
2244 if (lwp
->pending_signals_to_report
!= NULL
)
2246 struct pending_signals
**p_sig
;
2248 p_sig
= &lwp
->pending_signals_to_report
;
2249 while ((*p_sig
)->prev
!= NULL
)
2250 p_sig
= &(*p_sig
)->prev
;
2252 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2253 if ((*p_sig
)->info
.si_signo
!= 0)
2254 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2260 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2261 WSTOPSIG (*wstat
), lwpid_of (thread
));
2265 struct pending_signals
*sig
;
2267 for (sig
= lwp
->pending_signals_to_report
;
2270 debug_printf (" Still queued %d\n",
2273 debug_printf (" (no more queued signals)\n");
2282 /* Fetch the possibly triggered data watchpoint info and store it in
2285 On some archs, like x86, that use debug registers to set
2286 watchpoints, it's possible that the way to know which watched
2287 address trapped, is to check the register that is used to select
2288 which address to watch. Problem is, between setting the watchpoint
2289 and reading back which data address trapped, the user may change
2290 the set of watchpoints, and, as a consequence, GDB changes the
2291 debug registers in the inferior. To avoid reading back a stale
2292 stopped-data-address when that happens, we cache in LP the fact
2293 that a watchpoint trapped, and the corresponding data address, as
2294 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2295 registers meanwhile, we have the cached data we can rely on. */
2298 check_stopped_by_watchpoint (struct lwp_info
*child
)
2300 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2302 struct thread_info
*saved_thread
;
2304 saved_thread
= current_thread
;
2305 current_thread
= get_lwp_thread (child
);
2307 if (the_low_target
.stopped_by_watchpoint ())
2309 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2311 if (the_low_target
.stopped_data_address
!= NULL
)
2312 child
->stopped_data_address
2313 = the_low_target
.stopped_data_address ();
2315 child
->stopped_data_address
= 0;
2318 current_thread
= saved_thread
;
2321 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2324 /* Return the ptrace options that we want to try to enable. */
2327 linux_low_ptrace_options (int attached
)
2329 client_state
&cs
= get_client_state ();
2333 options
|= PTRACE_O_EXITKILL
;
2335 if (cs
.report_fork_events
)
2336 options
|= PTRACE_O_TRACEFORK
;
2338 if (cs
.report_vfork_events
)
2339 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2341 if (cs
.report_exec_events
)
2342 options
|= PTRACE_O_TRACEEXEC
;
2344 options
|= PTRACE_O_TRACESYSGOOD
;
2349 /* Do low-level handling of the event, and check if we should go on
2350 and pass it to caller code. Return the affected lwp if we are, or
2353 static struct lwp_info
*
2354 linux_low_filter_event (int lwpid
, int wstat
)
2356 client_state
&cs
= get_client_state ();
2357 struct lwp_info
*child
;
2358 struct thread_info
*thread
;
2359 int have_stop_pc
= 0;
2361 child
= find_lwp_pid (ptid_t (lwpid
));
2363 /* Check for stop events reported by a process we didn't already
2364 know about - anything not already in our LWP list.
2366 If we're expecting to receive stopped processes after
2367 fork, vfork, and clone events, then we'll just add the
2368 new one to our list and go back to waiting for the event
2369 to be reported - the stopped process might be returned
2370 from waitpid before or after the event is.
2372 But note the case of a non-leader thread exec'ing after the
2373 leader having exited, and gone from our lists (because
2374 check_zombie_leaders deleted it). The non-leader thread
2375 changes its tid to the tgid. */
2377 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2378 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2382 /* A multi-thread exec after we had seen the leader exiting. */
2385 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2386 "after exec.\n", lwpid
);
2389 child_ptid
= ptid_t (lwpid
, lwpid
, 0);
2390 child
= add_lwp (child_ptid
);
2392 current_thread
= child
->thread
;
2395 /* If we didn't find a process, one of two things presumably happened:
2396 - A process we started and then detached from has exited. Ignore it.
2397 - A process we are controlling has forked and the new child's stop
2398 was reported to us by the kernel. Save its PID. */
2399 if (child
== NULL
&& WIFSTOPPED (wstat
))
2401 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2404 else if (child
== NULL
)
2407 thread
= get_lwp_thread (child
);
2411 child
->last_status
= wstat
;
2413 /* Check if the thread has exited. */
2414 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2417 debug_printf ("LLFE: %d exited.\n", lwpid
);
2419 if (finish_step_over (child
))
2421 /* Unsuspend all other LWPs, and set them back running again. */
2422 unsuspend_all_lwps (child
);
2425 /* If there is at least one more LWP, then the exit signal was
2426 not the end of the debugged application and should be
2427 ignored, unless GDB wants to hear about thread exits. */
2428 if (cs
.report_thread_events
2429 || last_thread_of_process_p (pid_of (thread
)))
2431 /* Since events are serialized to GDB core, and we can't
2432 report this one right now. Leave the status pending for
2433 the next time we're able to report it. */
2434 mark_lwp_dead (child
, wstat
);
2444 gdb_assert (WIFSTOPPED (wstat
));
2446 if (WIFSTOPPED (wstat
))
2448 struct process_info
*proc
;
2450 /* Architecture-specific setup after inferior is running. */
2451 proc
= find_process_pid (pid_of (thread
));
2452 if (proc
->tdesc
== NULL
)
2456 /* This needs to happen after we have attached to the
2457 inferior and it is stopped for the first time, but
2458 before we access any inferior registers. */
2459 linux_arch_setup_thread (thread
);
2463 /* The process is started, but GDBserver will do
2464 architecture-specific setup after the program stops at
2465 the first instruction. */
2466 child
->status_pending_p
= 1;
2467 child
->status_pending
= wstat
;
2473 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2475 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2476 int options
= linux_low_ptrace_options (proc
->attached
);
2478 linux_enable_event_reporting (lwpid
, options
);
2479 child
->must_set_ptrace_flags
= 0;
2482 /* Always update syscall_state, even if it will be filtered later. */
2483 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2485 child
->syscall_state
2486 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2487 ? TARGET_WAITKIND_SYSCALL_RETURN
2488 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2492 /* Almost all other ptrace-stops are known to be outside of system
2493 calls, with further exceptions in handle_extended_wait. */
2494 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2497 /* Be careful to not overwrite stop_pc until save_stop_reason is
2499 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2500 && linux_is_extended_waitstatus (wstat
))
2502 child
->stop_pc
= get_pc (child
);
2503 if (handle_extended_wait (&child
, wstat
))
2505 /* The event has been handled, so just return without
2511 if (linux_wstatus_maybe_breakpoint (wstat
))
2513 if (save_stop_reason (child
))
2518 child
->stop_pc
= get_pc (child
);
2520 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2521 && child
->stop_expected
)
2524 debug_printf ("Expected stop.\n");
2525 child
->stop_expected
= 0;
2527 if (thread
->last_resume_kind
== resume_stop
)
2529 /* We want to report the stop to the core. Treat the
2530 SIGSTOP as a normal event. */
2532 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2533 target_pid_to_str (ptid_of (thread
)));
2535 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2537 /* Stopping threads. We don't want this SIGSTOP to end up
2540 debug_printf ("LLW: SIGSTOP caught for %s "
2541 "while stopping threads.\n",
2542 target_pid_to_str (ptid_of (thread
)));
2547 /* This is a delayed SIGSTOP. Filter out the event. */
2549 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2550 child
->stepping
? "step" : "continue",
2551 target_pid_to_str (ptid_of (thread
)));
2553 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2558 child
->status_pending_p
= 1;
2559 child
->status_pending
= wstat
;
2563 /* Return true if THREAD is doing hardware single step. */
2566 maybe_hw_step (struct thread_info
*thread
)
2568 if (can_hardware_single_step ())
2572 /* GDBserver must insert single-step breakpoint for software
2574 gdb_assert (has_single_step_breakpoints (thread
));
2579 /* Resume LWPs that are currently stopped without any pending status
2580 to report, but are resumed from the core's perspective. */
2583 resume_stopped_resumed_lwps (thread_info
*thread
)
2585 struct lwp_info
*lp
= get_thread_lwp (thread
);
2589 && !lp
->status_pending_p
2590 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2594 if (thread
->last_resume_kind
== resume_step
)
2595 step
= maybe_hw_step (thread
);
2598 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2599 target_pid_to_str (ptid_of (thread
)),
2600 paddress (lp
->stop_pc
),
2603 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2607 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2608 match FILTER_PTID (leaving others pending). The PTIDs can be:
2609 minus_one_ptid, to specify any child; a pid PTID, specifying all
2610 lwps of a thread group; or a PTID representing a single lwp. Store
2611 the stop status through the status pointer WSTAT. OPTIONS is
2612 passed to the waitpid call. Return 0 if no event was found and
2613 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2614 was found. Return the PID of the stopped child otherwise. */
2617 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2618 int *wstatp
, int options
)
2620 struct thread_info
*event_thread
;
2621 struct lwp_info
*event_child
, *requested_child
;
2622 sigset_t block_mask
, prev_mask
;
2625 /* N.B. event_thread points to the thread_info struct that contains
2626 event_child. Keep them in sync. */
2627 event_thread
= NULL
;
2629 requested_child
= NULL
;
2631 /* Check for a lwp with a pending status. */
2633 if (filter_ptid
== minus_one_ptid
|| filter_ptid
.is_pid ())
2635 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2637 return status_pending_p_callback (thread
, filter_ptid
);
2640 if (event_thread
!= NULL
)
2641 event_child
= get_thread_lwp (event_thread
);
2642 if (debug_threads
&& event_thread
)
2643 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2645 else if (filter_ptid
!= null_ptid
)
2647 requested_child
= find_lwp_pid (filter_ptid
);
2649 if (stopping_threads
== NOT_STOPPING_THREADS
2650 && requested_child
->status_pending_p
2651 && (requested_child
->collecting_fast_tracepoint
2652 != fast_tpoint_collect_result::not_collecting
))
2654 enqueue_one_deferred_signal (requested_child
,
2655 &requested_child
->status_pending
);
2656 requested_child
->status_pending_p
= 0;
2657 requested_child
->status_pending
= 0;
2658 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2661 if (requested_child
->suspended
2662 && requested_child
->status_pending_p
)
2664 internal_error (__FILE__
, __LINE__
,
2665 "requesting an event out of a"
2666 " suspended child?");
2669 if (requested_child
->status_pending_p
)
2671 event_child
= requested_child
;
2672 event_thread
= get_lwp_thread (event_child
);
2676 if (event_child
!= NULL
)
2679 debug_printf ("Got an event from pending child %ld (%04x)\n",
2680 lwpid_of (event_thread
), event_child
->status_pending
);
2681 *wstatp
= event_child
->status_pending
;
2682 event_child
->status_pending_p
= 0;
2683 event_child
->status_pending
= 0;
2684 current_thread
= event_thread
;
2685 return lwpid_of (event_thread
);
2688 /* But if we don't find a pending event, we'll have to wait.
2690 We only enter this loop if no process has a pending wait status.
2691 Thus any action taken in response to a wait status inside this
2692 loop is responding as soon as we detect the status, not after any
2695 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2696 all signals while here. */
2697 sigfillset (&block_mask
);
2698 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2700 /* Always pull all events out of the kernel. We'll randomly select
2701 an event LWP out of all that have events, to prevent
2703 while (event_child
== NULL
)
2707 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2710 - If the thread group leader exits while other threads in the
2711 thread group still exist, waitpid(TGID, ...) hangs. That
2712 waitpid won't return an exit status until the other threads
2713 in the group are reaped.
2715 - When a non-leader thread execs, that thread just vanishes
2716 without reporting an exit (so we'd hang if we waited for it
2717 explicitly in that case). The exec event is reported to
2720 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2723 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2724 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2730 debug_printf ("LLW: waitpid %ld received %s\n",
2731 (long) ret
, status_to_str (*wstatp
));
2734 /* Filter all events. IOW, leave all events pending. We'll
2735 randomly select an event LWP out of all that have events
2737 linux_low_filter_event (ret
, *wstatp
);
2738 /* Retry until nothing comes out of waitpid. A single
2739 SIGCHLD can indicate more than one child stopped. */
2743 /* Now that we've pulled all events out of the kernel, resume
2744 LWPs that don't have an interesting event to report. */
2745 if (stopping_threads
== NOT_STOPPING_THREADS
)
2746 for_each_thread (resume_stopped_resumed_lwps
);
2748 /* ... and find an LWP with a status to report to the core, if
2750 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2752 return status_pending_p_callback (thread
, filter_ptid
);
2755 if (event_thread
!= NULL
)
2757 event_child
= get_thread_lwp (event_thread
);
2758 *wstatp
= event_child
->status_pending
;
2759 event_child
->status_pending_p
= 0;
2760 event_child
->status_pending
= 0;
2764 /* Check for zombie thread group leaders. Those can't be reaped
2765 until all other threads in the thread group are. */
2766 check_zombie_leaders ();
2768 auto not_stopped
= [&] (thread_info
*thread
)
2770 return not_stopped_callback (thread
, wait_ptid
);
2773 /* If there are no resumed children left in the set of LWPs we
2774 want to wait for, bail. We can't just block in
2775 waitpid/sigsuspend, because lwps might have been left stopped
2776 in trace-stop state, and we'd be stuck forever waiting for
2777 their status to change (which would only happen if we resumed
2778 them). Even if WNOHANG is set, this return code is preferred
2779 over 0 (below), as it is more detailed. */
2780 if (find_thread (not_stopped
) == NULL
)
2783 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2784 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2788 /* No interesting event to report to the caller. */
2789 if ((options
& WNOHANG
))
2792 debug_printf ("WNOHANG set, no event found\n");
2794 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2798 /* Block until we get an event reported with SIGCHLD. */
2800 debug_printf ("sigsuspend'ing\n");
2802 sigsuspend (&prev_mask
);
2803 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2807 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2809 current_thread
= event_thread
;
2811 return lwpid_of (event_thread
);
2814 /* Wait for an event from child(ren) PTID. PTIDs can be:
2815 minus_one_ptid, to specify any child; a pid PTID, specifying all
2816 lwps of a thread group; or a PTID representing a single lwp. Store
2817 the stop status through the status pointer WSTAT. OPTIONS is
2818 passed to the waitpid call. Return 0 if no event was found and
2819 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2820 was found. Return the PID of the stopped child otherwise. */
2823 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2825 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2828 /* Select one LWP out of those that have events pending. */
2831 select_event_lwp (struct lwp_info
**orig_lp
)
2833 int random_selector
;
2834 struct thread_info
*event_thread
= NULL
;
2836 /* In all-stop, give preference to the LWP that is being
2837 single-stepped. There will be at most one, and it's the LWP that
2838 the core is most interested in. If we didn't do this, then we'd
2839 have to handle pending step SIGTRAPs somehow in case the core
2840 later continues the previously-stepped thread, otherwise we'd
2841 report the pending SIGTRAP, and the core, not having stepped the
2842 thread, wouldn't understand what the trap was for, and therefore
2843 would report it to the user as a random signal. */
2846 event_thread
= find_thread ([] (thread_info
*thread
)
2848 lwp_info
*lp
= get_thread_lwp (thread
);
2850 return (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2851 && thread
->last_resume_kind
== resume_step
2852 && lp
->status_pending_p
);
2855 if (event_thread
!= NULL
)
2858 debug_printf ("SEL: Select single-step %s\n",
2859 target_pid_to_str (ptid_of (event_thread
)));
2862 if (event_thread
== NULL
)
2864 /* No single-stepping LWP. Select one at random, out of those
2865 which have had events. */
2867 /* First see how many events we have. */
2869 for_each_thread ([&] (thread_info
*thread
)
2871 lwp_info
*lp
= get_thread_lwp (thread
);
2873 /* Count only resumed LWPs that have an event pending. */
2874 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2875 && lp
->status_pending_p
)
2878 gdb_assert (num_events
> 0);
2880 /* Now randomly pick a LWP out of those that have had
2882 random_selector
= (int)
2883 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2885 if (debug_threads
&& num_events
> 1)
2886 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2887 num_events
, random_selector
);
2889 event_thread
= find_thread ([&] (thread_info
*thread
)
2891 lwp_info
*lp
= get_thread_lwp (thread
);
2893 /* Select only resumed LWPs that have an event pending. */
2894 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2895 && lp
->status_pending_p
)
2896 if (random_selector
-- == 0)
2903 if (event_thread
!= NULL
)
2905 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2907 /* Switch the event LWP. */
2908 *orig_lp
= event_lp
;
2912 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2916 unsuspend_all_lwps (struct lwp_info
*except
)
2918 for_each_thread ([&] (thread_info
*thread
)
2920 lwp_info
*lwp
= get_thread_lwp (thread
);
2923 lwp_suspended_decr (lwp
);
2927 static void move_out_of_jump_pad_callback (thread_info
*thread
);
2928 static bool stuck_in_jump_pad_callback (thread_info
*thread
);
2929 static bool lwp_running (thread_info
*thread
);
2930 static ptid_t
linux_wait_1 (ptid_t ptid
,
2931 struct target_waitstatus
*ourstatus
,
2932 int target_options
);
2934 /* Stabilize threads (move out of jump pads).
2936 If a thread is midway collecting a fast tracepoint, we need to
2937 finish the collection and move it out of the jump pad before
2938 reporting the signal.
2940 This avoids recursion while collecting (when a signal arrives
2941 midway, and the signal handler itself collects), which would trash
2942 the trace buffer. In case the user set a breakpoint in a signal
2943 handler, this avoids the backtrace showing the jump pad, etc..
2944 Most importantly, there are certain things we can't do safely if
2945 threads are stopped in a jump pad (or in its callee's). For
2948 - starting a new trace run. A thread still collecting the
2949 previous run, could trash the trace buffer when resumed. The trace
2950 buffer control structures would have been reset but the thread had
2951 no way to tell. The thread could even midway memcpy'ing to the
2952 buffer, which would mean that when resumed, it would clobber the
2953 trace buffer that had been set for a new run.
2955 - we can't rewrite/reuse the jump pads for new tracepoints
2956 safely. Say you do tstart while a thread is stopped midway while
2957 collecting. When the thread is later resumed, it finishes the
2958 collection, and returns to the jump pad, to execute the original
2959 instruction that was under the tracepoint jump at the time the
2960 older run had been started. If the jump pad had been rewritten
2961 since for something else in the new run, the thread would now
2962 execute the wrong / random instructions. */
2965 linux_stabilize_threads (void)
2967 thread_info
*thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
2969 if (thread_stuck
!= NULL
)
2972 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2973 lwpid_of (thread_stuck
));
2977 thread_info
*saved_thread
= current_thread
;
2979 stabilizing_threads
= 1;
2982 for_each_thread (move_out_of_jump_pad_callback
);
2984 /* Loop until all are stopped out of the jump pads. */
2985 while (find_thread (lwp_running
) != NULL
)
2987 struct target_waitstatus ourstatus
;
2988 struct lwp_info
*lwp
;
2991 /* Note that we go through the full wait even loop. While
2992 moving threads out of jump pad, we need to be able to step
2993 over internal breakpoints and such. */
2994 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2996 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2998 lwp
= get_thread_lwp (current_thread
);
3001 lwp_suspended_inc (lwp
);
3003 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3004 || current_thread
->last_resume_kind
== resume_stop
)
3006 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3007 enqueue_one_deferred_signal (lwp
, &wstat
);
3012 unsuspend_all_lwps (NULL
);
3014 stabilizing_threads
= 0;
3016 current_thread
= saved_thread
;
3020 thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
3022 if (thread_stuck
!= NULL
)
3023 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3024 lwpid_of (thread_stuck
));
3028 /* Convenience function that is called when the kernel reports an
3029 event that is not passed out to GDB. */
3032 ignore_event (struct target_waitstatus
*ourstatus
)
3034 /* If we got an event, there may still be others, as a single
3035 SIGCHLD can indicate more than one child stopped. This forces
3036 another target_wait call. */
3039 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3043 /* Convenience function that is called when the kernel reports an exit
3044 event. This decides whether to report the event to GDB as a
3045 process exit event, a thread exit event, or to suppress the
3049 filter_exit_event (struct lwp_info
*event_child
,
3050 struct target_waitstatus
*ourstatus
)
3052 client_state
&cs
= get_client_state ();
3053 struct thread_info
*thread
= get_lwp_thread (event_child
);
3054 ptid_t ptid
= ptid_of (thread
);
3056 if (!last_thread_of_process_p (pid_of (thread
)))
3058 if (cs
.report_thread_events
)
3059 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3061 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3063 delete_lwp (event_child
);
3068 /* Returns 1 if GDB is interested in any event_child syscalls. */
3071 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3073 struct thread_info
*thread
= get_lwp_thread (event_child
);
3074 struct process_info
*proc
= get_thread_process (thread
);
3076 return !proc
->syscalls_to_catch
.empty ();
3079 /* Returns 1 if GDB is interested in the event_child syscall.
3080 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3083 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3086 struct thread_info
*thread
= get_lwp_thread (event_child
);
3087 struct process_info
*proc
= get_thread_process (thread
);
3089 if (proc
->syscalls_to_catch
.empty ())
3092 if (proc
->syscalls_to_catch
[0] == ANY_SYSCALL
)
3095 get_syscall_trapinfo (event_child
, &sysno
);
3097 for (int iter
: proc
->syscalls_to_catch
)
3104 /* Wait for process, returns status. */
3107 linux_wait_1 (ptid_t ptid
,
3108 struct target_waitstatus
*ourstatus
, int target_options
)
3110 client_state
&cs
= get_client_state ();
3112 struct lwp_info
*event_child
;
3115 int step_over_finished
;
3116 int bp_explains_trap
;
3117 int maybe_internal_trap
;
3126 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3129 /* Translate generic target options into linux options. */
3131 if (target_options
& TARGET_WNOHANG
)
3134 bp_explains_trap
= 0;
3137 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3139 auto status_pending_p_any
= [&] (thread_info
*thread
)
3141 return status_pending_p_callback (thread
, minus_one_ptid
);
3144 auto not_stopped
= [&] (thread_info
*thread
)
3146 return not_stopped_callback (thread
, minus_one_ptid
);
3149 /* Find a resumed LWP, if any. */
3150 if (find_thread (status_pending_p_any
) != NULL
)
3152 else if (find_thread (not_stopped
) != NULL
)
3157 if (step_over_bkpt
== null_ptid
)
3158 pid
= linux_wait_for_event (ptid
, &w
, options
);
3162 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3163 target_pid_to_str (step_over_bkpt
));
3164 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3167 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3169 gdb_assert (target_options
& TARGET_WNOHANG
);
3173 debug_printf ("linux_wait_1 ret = null_ptid, "
3174 "TARGET_WAITKIND_IGNORE\n");
3178 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3185 debug_printf ("linux_wait_1 ret = null_ptid, "
3186 "TARGET_WAITKIND_NO_RESUMED\n");
3190 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3194 event_child
= get_thread_lwp (current_thread
);
3196 /* linux_wait_for_event only returns an exit status for the last
3197 child of a process. Report it. */
3198 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3202 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3203 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3207 debug_printf ("linux_wait_1 ret = %s, exited with "
3209 target_pid_to_str (ptid_of (current_thread
)),
3216 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3217 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3221 debug_printf ("linux_wait_1 ret = %s, terminated with "
3223 target_pid_to_str (ptid_of (current_thread
)),
3229 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3230 return filter_exit_event (event_child
, ourstatus
);
3232 return ptid_of (current_thread
);
3235 /* If step-over executes a breakpoint instruction, in the case of a
3236 hardware single step it means a gdb/gdbserver breakpoint had been
3237 planted on top of a permanent breakpoint, in the case of a software
3238 single step it may just mean that gdbserver hit the reinsert breakpoint.
3239 The PC has been adjusted by save_stop_reason to point at
3240 the breakpoint address.
3241 So in the case of the hardware single step advance the PC manually
3242 past the breakpoint and in the case of software single step advance only
3243 if it's not the single_step_breakpoint we are hitting.
3244 This avoids that a program would keep trapping a permanent breakpoint
3246 if (step_over_bkpt
!= null_ptid
3247 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3248 && (event_child
->stepping
3249 || !single_step_breakpoint_inserted_here (event_child
->stop_pc
)))
3251 int increment_pc
= 0;
3252 int breakpoint_kind
= 0;
3253 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3256 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3257 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3261 debug_printf ("step-over for %s executed software breakpoint\n",
3262 target_pid_to_str (ptid_of (current_thread
)));
3265 if (increment_pc
!= 0)
3267 struct regcache
*regcache
3268 = get_thread_regcache (current_thread
, 1);
3270 event_child
->stop_pc
+= increment_pc
;
3271 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3273 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3274 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3278 /* If this event was not handled before, and is not a SIGTRAP, we
3279 report it. SIGILL and SIGSEGV are also treated as traps in case
3280 a breakpoint is inserted at the current PC. If this target does
3281 not support internal breakpoints at all, we also report the
3282 SIGTRAP without further processing; it's of no concern to us. */
3284 = (supports_breakpoints ()
3285 && (WSTOPSIG (w
) == SIGTRAP
3286 || ((WSTOPSIG (w
) == SIGILL
3287 || WSTOPSIG (w
) == SIGSEGV
)
3288 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3290 if (maybe_internal_trap
)
3292 /* Handle anything that requires bookkeeping before deciding to
3293 report the event or continue waiting. */
3295 /* First check if we can explain the SIGTRAP with an internal
3296 breakpoint, or if we should possibly report the event to GDB.
3297 Do this before anything that may remove or insert a
3299 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3301 /* We have a SIGTRAP, possibly a step-over dance has just
3302 finished. If so, tweak the state machine accordingly,
3303 reinsert breakpoints and delete any single-step
3305 step_over_finished
= finish_step_over (event_child
);
3307 /* Now invoke the callbacks of any internal breakpoints there. */
3308 check_breakpoints (event_child
->stop_pc
);
3310 /* Handle tracepoint data collecting. This may overflow the
3311 trace buffer, and cause a tracing stop, removing
3313 trace_event
= handle_tracepoints (event_child
);
3315 if (bp_explains_trap
)
3318 debug_printf ("Hit a gdbserver breakpoint.\n");
3323 /* We have some other signal, possibly a step-over dance was in
3324 progress, and it should be cancelled too. */
3325 step_over_finished
= finish_step_over (event_child
);
3328 /* We have all the data we need. Either report the event to GDB, or
3329 resume threads and keep waiting for more. */
3331 /* If we're collecting a fast tracepoint, finish the collection and
3332 move out of the jump pad before delivering a signal. See
3333 linux_stabilize_threads. */
3336 && WSTOPSIG (w
) != SIGTRAP
3337 && supports_fast_tracepoints ()
3338 && agent_loaded_p ())
3341 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3342 "to defer or adjust it.\n",
3343 WSTOPSIG (w
), lwpid_of (current_thread
));
3345 /* Allow debugging the jump pad itself. */
3346 if (current_thread
->last_resume_kind
!= resume_step
3347 && maybe_move_out_of_jump_pad (event_child
, &w
))
3349 enqueue_one_deferred_signal (event_child
, &w
);
3352 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3353 WSTOPSIG (w
), lwpid_of (current_thread
));
3355 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3359 return ignore_event (ourstatus
);
3363 if (event_child
->collecting_fast_tracepoint
3364 != fast_tpoint_collect_result::not_collecting
)
3367 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3368 "Check if we're already there.\n",
3369 lwpid_of (current_thread
),
3370 (int) event_child
->collecting_fast_tracepoint
);
3374 event_child
->collecting_fast_tracepoint
3375 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3377 if (event_child
->collecting_fast_tracepoint
3378 != fast_tpoint_collect_result::before_insn
)
3380 /* No longer need this breakpoint. */
3381 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3384 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3385 "stopping all threads momentarily.\n");
3387 /* Other running threads could hit this breakpoint.
3388 We don't handle moribund locations like GDB does,
3389 instead we always pause all threads when removing
3390 breakpoints, so that any step-over or
3391 decr_pc_after_break adjustment is always taken
3392 care of while the breakpoint is still
3394 stop_all_lwps (1, event_child
);
3396 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3397 event_child
->exit_jump_pad_bkpt
= NULL
;
3399 unstop_all_lwps (1, event_child
);
3401 gdb_assert (event_child
->suspended
>= 0);
3405 if (event_child
->collecting_fast_tracepoint
3406 == fast_tpoint_collect_result::not_collecting
)
3409 debug_printf ("fast tracepoint finished "
3410 "collecting successfully.\n");
3412 /* We may have a deferred signal to report. */
3413 if (dequeue_one_deferred_signal (event_child
, &w
))
3416 debug_printf ("dequeued one signal.\n");
3421 debug_printf ("no deferred signals.\n");
3423 if (stabilizing_threads
)
3425 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3426 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3430 debug_printf ("linux_wait_1 ret = %s, stopped "
3431 "while stabilizing threads\n",
3432 target_pid_to_str (ptid_of (current_thread
)));
3436 return ptid_of (current_thread
);
3442 /* Check whether GDB would be interested in this event. */
3444 /* Check if GDB is interested in this syscall. */
3446 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3447 && !gdb_catch_this_syscall_p (event_child
))
3451 debug_printf ("Ignored syscall for LWP %ld.\n",
3452 lwpid_of (current_thread
));
3455 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3460 return ignore_event (ourstatus
);
3463 /* If GDB is not interested in this signal, don't stop other
3464 threads, and don't report it to GDB. Just resume the inferior
3465 right away. We do this for threading-related signals as well as
3466 any that GDB specifically requested we ignore. But never ignore
3467 SIGSTOP if we sent it ourselves, and do not ignore signals when
3468 stepping - they may require special handling to skip the signal
3469 handler. Also never ignore signals that could be caused by a
3472 && current_thread
->last_resume_kind
!= resume_step
3474 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3475 (current_process ()->priv
->thread_db
!= NULL
3476 && (WSTOPSIG (w
) == __SIGRTMIN
3477 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3480 (cs
.pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3481 && !(WSTOPSIG (w
) == SIGSTOP
3482 && current_thread
->last_resume_kind
== resume_stop
)
3483 && !linux_wstatus_maybe_breakpoint (w
))))
3485 siginfo_t info
, *info_p
;
3488 debug_printf ("Ignored signal %d for LWP %ld.\n",
3489 WSTOPSIG (w
), lwpid_of (current_thread
));
3491 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3492 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3497 if (step_over_finished
)
3499 /* We cancelled this thread's step-over above. We still
3500 need to unsuspend all other LWPs, and set them back
3501 running again while the signal handler runs. */
3502 unsuspend_all_lwps (event_child
);
3504 /* Enqueue the pending signal info so that proceed_all_lwps
3506 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3508 proceed_all_lwps ();
3512 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3513 WSTOPSIG (w
), info_p
);
3519 return ignore_event (ourstatus
);
3522 /* Note that all addresses are always "out of the step range" when
3523 there's no range to begin with. */
3524 in_step_range
= lwp_in_step_range (event_child
);
3526 /* If GDB wanted this thread to single step, and the thread is out
3527 of the step range, we always want to report the SIGTRAP, and let
3528 GDB handle it. Watchpoints should always be reported. So should
3529 signals we can't explain. A SIGTRAP we can't explain could be a
3530 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3531 do, we're be able to handle GDB breakpoints on top of internal
3532 breakpoints, by handling the internal breakpoint and still
3533 reporting the event to GDB. If we don't, we're out of luck, GDB
3534 won't see the breakpoint hit. If we see a single-step event but
3535 the thread should be continuing, don't pass the trap to gdb.
3536 That indicates that we had previously finished a single-step but
3537 left the single-step pending -- see
3538 complete_ongoing_step_over. */
3539 report_to_gdb
= (!maybe_internal_trap
3540 || (current_thread
->last_resume_kind
== resume_step
3542 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3544 && !bp_explains_trap
3546 && !step_over_finished
3547 && !(current_thread
->last_resume_kind
== resume_continue
3548 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3549 || (gdb_breakpoint_here (event_child
->stop_pc
)
3550 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3551 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3552 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3554 run_breakpoint_commands (event_child
->stop_pc
);
3556 /* We found no reason GDB would want us to stop. We either hit one
3557 of our own breakpoints, or finished an internal step GDB
3558 shouldn't know about. */
3563 if (bp_explains_trap
)
3564 debug_printf ("Hit a gdbserver breakpoint.\n");
3565 if (step_over_finished
)
3566 debug_printf ("Step-over finished.\n");
3568 debug_printf ("Tracepoint event.\n");
3569 if (lwp_in_step_range (event_child
))
3570 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3571 paddress (event_child
->stop_pc
),
3572 paddress (event_child
->step_range_start
),
3573 paddress (event_child
->step_range_end
));
3576 /* We're not reporting this breakpoint to GDB, so apply the
3577 decr_pc_after_break adjustment to the inferior's regcache
3580 if (the_low_target
.set_pc
!= NULL
)
3582 struct regcache
*regcache
3583 = get_thread_regcache (current_thread
, 1);
3584 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3587 if (step_over_finished
)
3589 /* If we have finished stepping over a breakpoint, we've
3590 stopped and suspended all LWPs momentarily except the
3591 stepping one. This is where we resume them all again.
3592 We're going to keep waiting, so use proceed, which
3593 handles stepping over the next breakpoint. */
3594 unsuspend_all_lwps (event_child
);
3598 /* Remove the single-step breakpoints if any. Note that
3599 there isn't single-step breakpoint if we finished stepping
3601 if (can_software_single_step ()
3602 && has_single_step_breakpoints (current_thread
))
3604 stop_all_lwps (0, event_child
);
3605 delete_single_step_breakpoints (current_thread
);
3606 unstop_all_lwps (0, event_child
);
3611 debug_printf ("proceeding all threads.\n");
3612 proceed_all_lwps ();
3617 return ignore_event (ourstatus
);
3622 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3625 = target_waitstatus_to_string (&event_child
->waitstatus
);
3627 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3628 lwpid_of (get_lwp_thread (event_child
)), str
.c_str ());
3630 if (current_thread
->last_resume_kind
== resume_step
)
3632 if (event_child
->step_range_start
== event_child
->step_range_end
)
3633 debug_printf ("GDB wanted to single-step, reporting event.\n");
3634 else if (!lwp_in_step_range (event_child
))
3635 debug_printf ("Out of step range, reporting event.\n");
3637 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3638 debug_printf ("Stopped by watchpoint.\n");
3639 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3640 debug_printf ("Stopped by GDB breakpoint.\n");
3642 debug_printf ("Hit a non-gdbserver trap event.\n");
3645 /* Alright, we're going to report a stop. */
3647 /* Remove single-step breakpoints. */
3648 if (can_software_single_step ())
3650 /* Remove single-step breakpoints or not. It it is true, stop all
3651 lwps, so that other threads won't hit the breakpoint in the
3653 int remove_single_step_breakpoints_p
= 0;
3657 remove_single_step_breakpoints_p
3658 = has_single_step_breakpoints (current_thread
);
3662 /* In all-stop, a stop reply cancels all previous resume
3663 requests. Delete all single-step breakpoints. */
3665 find_thread ([&] (thread_info
*thread
) {
3666 if (has_single_step_breakpoints (thread
))
3668 remove_single_step_breakpoints_p
= 1;
3676 if (remove_single_step_breakpoints_p
)
3678 /* If we remove single-step breakpoints from memory, stop all lwps,
3679 so that other threads won't hit the breakpoint in the staled
3681 stop_all_lwps (0, event_child
);
3685 gdb_assert (has_single_step_breakpoints (current_thread
));
3686 delete_single_step_breakpoints (current_thread
);
3690 for_each_thread ([] (thread_info
*thread
){
3691 if (has_single_step_breakpoints (thread
))
3692 delete_single_step_breakpoints (thread
);
3696 unstop_all_lwps (0, event_child
);
3700 if (!stabilizing_threads
)
3702 /* In all-stop, stop all threads. */
3704 stop_all_lwps (0, NULL
);
3706 if (step_over_finished
)
3710 /* If we were doing a step-over, all other threads but
3711 the stepping one had been paused in start_step_over,
3712 with their suspend counts incremented. We don't want
3713 to do a full unstop/unpause, because we're in
3714 all-stop mode (so we want threads stopped), but we
3715 still need to unsuspend the other threads, to
3716 decrement their `suspended' count back. */
3717 unsuspend_all_lwps (event_child
);
3721 /* If we just finished a step-over, then all threads had
3722 been momentarily paused. In all-stop, that's fine,
3723 we want threads stopped by now anyway. In non-stop,
3724 we need to re-resume threads that GDB wanted to be
3726 unstop_all_lwps (1, event_child
);
3730 /* If we're not waiting for a specific LWP, choose an event LWP
3731 from among those that have had events. Giving equal priority
3732 to all LWPs that have had events helps prevent
3734 if (ptid
== minus_one_ptid
)
3736 event_child
->status_pending_p
= 1;
3737 event_child
->status_pending
= w
;
3739 select_event_lwp (&event_child
);
3741 /* current_thread and event_child must stay in sync. */
3742 current_thread
= get_lwp_thread (event_child
);
3744 event_child
->status_pending_p
= 0;
3745 w
= event_child
->status_pending
;
3749 /* Stabilize threads (move out of jump pads). */
3751 stabilize_threads ();
3755 /* If we just finished a step-over, then all threads had been
3756 momentarily paused. In all-stop, that's fine, we want
3757 threads stopped by now anyway. In non-stop, we need to
3758 re-resume threads that GDB wanted to be running. */
3759 if (step_over_finished
)
3760 unstop_all_lwps (1, event_child
);
3763 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3765 /* If the reported event is an exit, fork, vfork or exec, let
3768 /* Break the unreported fork relationship chain. */
3769 if (event_child
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
3770 || event_child
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
)
3772 event_child
->fork_relative
->fork_relative
= NULL
;
3773 event_child
->fork_relative
= NULL
;
3776 *ourstatus
= event_child
->waitstatus
;
3777 /* Clear the event lwp's waitstatus since we handled it already. */
3778 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3781 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3783 /* Now that we've selected our final event LWP, un-adjust its PC if
3784 it was a software breakpoint, and the client doesn't know we can
3785 adjust the breakpoint ourselves. */
3786 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3787 && !cs
.swbreak_feature
)
3789 int decr_pc
= the_low_target
.decr_pc_after_break
;
3793 struct regcache
*regcache
3794 = get_thread_regcache (current_thread
, 1);
3795 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3799 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3801 get_syscall_trapinfo (event_child
,
3802 &ourstatus
->value
.syscall_number
);
3803 ourstatus
->kind
= event_child
->syscall_state
;
3805 else if (current_thread
->last_resume_kind
== resume_stop
3806 && WSTOPSIG (w
) == SIGSTOP
)
3808 /* A thread that has been requested to stop by GDB with vCont;t,
3809 and it stopped cleanly, so report as SIG0. The use of
3810 SIGSTOP is an implementation detail. */
3811 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3813 else if (current_thread
->last_resume_kind
== resume_stop
3814 && WSTOPSIG (w
) != SIGSTOP
)
3816 /* A thread that has been requested to stop by GDB with vCont;t,
3817 but, it stopped for other reasons. */
3818 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3820 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3822 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3825 gdb_assert (step_over_bkpt
== null_ptid
);
3829 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3830 target_pid_to_str (ptid_of (current_thread
)),
3831 ourstatus
->kind
, ourstatus
->value
.sig
);
3835 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3836 return filter_exit_event (event_child
, ourstatus
);
3838 return ptid_of (current_thread
);
3841 /* Get rid of any pending event in the pipe. */
3843 async_file_flush (void)
3849 ret
= read (linux_event_pipe
[0], &buf
, 1);
3850 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3853 /* Put something in the pipe, so the event loop wakes up. */
3855 async_file_mark (void)
3859 async_file_flush ();
3862 ret
= write (linux_event_pipe
[1], "+", 1);
3863 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3865 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3866 be awakened anyway. */
3870 linux_wait (ptid_t ptid
,
3871 struct target_waitstatus
*ourstatus
, int target_options
)
3875 /* Flush the async file first. */
3876 if (target_is_async_p ())
3877 async_file_flush ();
3881 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3883 while ((target_options
& TARGET_WNOHANG
) == 0
3884 && event_ptid
== null_ptid
3885 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3887 /* If at least one stop was reported, there may be more. A single
3888 SIGCHLD can signal more than one child stop. */
3889 if (target_is_async_p ()
3890 && (target_options
& TARGET_WNOHANG
) != 0
3891 && event_ptid
!= null_ptid
)
3897 /* Send a signal to an LWP. */
3900 kill_lwp (unsigned long lwpid
, int signo
)
3905 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3906 if (errno
== ENOSYS
)
3908 /* If tkill fails, then we are not using nptl threads, a
3909 configuration we no longer support. */
3910 perror_with_name (("tkill"));
3916 linux_stop_lwp (struct lwp_info
*lwp
)
3922 send_sigstop (struct lwp_info
*lwp
)
3926 pid
= lwpid_of (get_lwp_thread (lwp
));
3928 /* If we already have a pending stop signal for this process, don't
3930 if (lwp
->stop_expected
)
3933 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3939 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3941 lwp
->stop_expected
= 1;
3942 kill_lwp (pid
, SIGSTOP
);
3946 send_sigstop (thread_info
*thread
, lwp_info
*except
)
3948 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3950 /* Ignore EXCEPT. */
3960 /* Increment the suspend count of an LWP, and stop it, if not stopped
3963 suspend_and_send_sigstop (thread_info
*thread
, lwp_info
*except
)
3965 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3967 /* Ignore EXCEPT. */
3971 lwp_suspended_inc (lwp
);
3973 send_sigstop (thread
, except
);
3977 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3979 /* Store the exit status for later. */
3980 lwp
->status_pending_p
= 1;
3981 lwp
->status_pending
= wstat
;
3983 /* Store in waitstatus as well, as there's nothing else to process
3985 if (WIFEXITED (wstat
))
3987 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
3988 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
3990 else if (WIFSIGNALED (wstat
))
3992 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
3993 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
3996 /* Prevent trying to stop it. */
3999 /* No further stops are expected from a dead lwp. */
4000 lwp
->stop_expected
= 0;
4003 /* Return true if LWP has exited already, and has a pending exit event
4004 to report to GDB. */
4007 lwp_is_marked_dead (struct lwp_info
*lwp
)
4009 return (lwp
->status_pending_p
4010 && (WIFEXITED (lwp
->status_pending
)
4011 || WIFSIGNALED (lwp
->status_pending
)));
4014 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4017 wait_for_sigstop (void)
4019 struct thread_info
*saved_thread
;
4024 saved_thread
= current_thread
;
4025 if (saved_thread
!= NULL
)
4026 saved_tid
= saved_thread
->id
;
4028 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4031 debug_printf ("wait_for_sigstop: pulling events\n");
4033 /* Passing NULL_PTID as filter indicates we want all events to be
4034 left pending. Eventually this returns when there are no
4035 unwaited-for children left. */
4036 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4038 gdb_assert (ret
== -1);
4040 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4041 current_thread
= saved_thread
;
4045 debug_printf ("Previously current thread died.\n");
4047 /* We can't change the current inferior behind GDB's back,
4048 otherwise, a subsequent command may apply to the wrong
4050 current_thread
= NULL
;
4054 /* Returns true if THREAD is stopped in a jump pad, and we can't
4055 move it out, because we need to report the stop event to GDB. For
4056 example, if the user puts a breakpoint in the jump pad, it's
4057 because she wants to debug it. */
4060 stuck_in_jump_pad_callback (thread_info
*thread
)
4062 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4064 if (lwp
->suspended
!= 0)
4066 internal_error (__FILE__
, __LINE__
,
4067 "LWP %ld is suspended, suspended=%d\n",
4068 lwpid_of (thread
), lwp
->suspended
);
4070 gdb_assert (lwp
->stopped
);
4072 /* Allow debugging the jump pad, gdb_collect, etc.. */
4073 return (supports_fast_tracepoints ()
4074 && agent_loaded_p ()
4075 && (gdb_breakpoint_here (lwp
->stop_pc
)
4076 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4077 || thread
->last_resume_kind
== resume_step
)
4078 && (linux_fast_tracepoint_collecting (lwp
, NULL
)
4079 != fast_tpoint_collect_result::not_collecting
));
4083 move_out_of_jump_pad_callback (thread_info
*thread
)
4085 struct thread_info
*saved_thread
;
4086 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4089 if (lwp
->suspended
!= 0)
4091 internal_error (__FILE__
, __LINE__
,
4092 "LWP %ld is suspended, suspended=%d\n",
4093 lwpid_of (thread
), lwp
->suspended
);
4095 gdb_assert (lwp
->stopped
);
4097 /* For gdb_breakpoint_here. */
4098 saved_thread
= current_thread
;
4099 current_thread
= thread
;
4101 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4103 /* Allow debugging the jump pad, gdb_collect, etc. */
4104 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4105 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4106 && thread
->last_resume_kind
!= resume_step
4107 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4110 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4115 lwp
->status_pending_p
= 0;
4116 enqueue_one_deferred_signal (lwp
, wstat
);
4119 debug_printf ("Signal %d for LWP %ld deferred "
4121 WSTOPSIG (*wstat
), lwpid_of (thread
));
4124 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4127 lwp_suspended_inc (lwp
);
4129 current_thread
= saved_thread
;
4133 lwp_running (thread_info
*thread
)
4135 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4137 if (lwp_is_marked_dead (lwp
))
4140 return !lwp
->stopped
;
4143 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4144 If SUSPEND, then also increase the suspend count of every LWP,
4148 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4150 /* Should not be called recursively. */
4151 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4156 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4157 suspend
? "stop-and-suspend" : "stop",
4159 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4163 stopping_threads
= (suspend
4164 ? STOPPING_AND_SUSPENDING_THREADS
4165 : STOPPING_THREADS
);
4168 for_each_thread ([&] (thread_info
*thread
)
4170 suspend_and_send_sigstop (thread
, except
);
4173 for_each_thread ([&] (thread_info
*thread
)
4175 send_sigstop (thread
, except
);
4178 wait_for_sigstop ();
4179 stopping_threads
= NOT_STOPPING_THREADS
;
4183 debug_printf ("stop_all_lwps done, setting stopping_threads "
4184 "back to !stopping\n");
4189 /* Enqueue one signal in the chain of signals which need to be
4190 delivered to this process on next resume. */
4193 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4195 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4197 p_sig
->prev
= lwp
->pending_signals
;
4198 p_sig
->signal
= signal
;
4200 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4202 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4203 lwp
->pending_signals
= p_sig
;
4206 /* Install breakpoints for software single stepping. */
4209 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4211 struct thread_info
*thread
= get_lwp_thread (lwp
);
4212 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4214 scoped_restore save_current_thread
= make_scoped_restore (¤t_thread
);
4216 current_thread
= thread
;
4217 std::vector
<CORE_ADDR
> next_pcs
= the_low_target
.get_next_pcs (regcache
);
4219 for (CORE_ADDR pc
: next_pcs
)
4220 set_single_step_breakpoint (pc
, current_ptid
);
4223 /* Single step via hardware or software single step.
4224 Return 1 if hardware single stepping, 0 if software single stepping
4225 or can't single step. */
4228 single_step (struct lwp_info
* lwp
)
4232 if (can_hardware_single_step ())
4236 else if (can_software_single_step ())
4238 install_software_single_step_breakpoints (lwp
);
4244 debug_printf ("stepping is not implemented on this target");
4250 /* The signal can be delivered to the inferior if we are not trying to
4251 finish a fast tracepoint collect. Since signal can be delivered in
4252 the step-over, the program may go to signal handler and trap again
4253 after return from the signal handler. We can live with the spurious
4257 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4259 return (lwp
->collecting_fast_tracepoint
4260 == fast_tpoint_collect_result::not_collecting
);
4263 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4264 SIGNAL is nonzero, give it that signal. */
4267 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4268 int step
, int signal
, siginfo_t
*info
)
4270 struct thread_info
*thread
= get_lwp_thread (lwp
);
4271 struct thread_info
*saved_thread
;
4273 struct process_info
*proc
= get_thread_process (thread
);
4275 /* Note that target description may not be initialised
4276 (proc->tdesc == NULL) at this point because the program hasn't
4277 stopped at the first instruction yet. It means GDBserver skips
4278 the extra traps from the wrapper program (see option --wrapper).
4279 Code in this function that requires register access should be
4280 guarded by proc->tdesc == NULL or something else. */
4282 if (lwp
->stopped
== 0)
4285 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4287 fast_tpoint_collect_result fast_tp_collecting
4288 = lwp
->collecting_fast_tracepoint
;
4290 gdb_assert (!stabilizing_threads
4291 || (fast_tp_collecting
4292 != fast_tpoint_collect_result::not_collecting
));
4294 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4295 user used the "jump" command, or "set $pc = foo"). */
4296 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4298 /* Collecting 'while-stepping' actions doesn't make sense
4300 release_while_stepping_state_list (thread
);
4303 /* If we have pending signals or status, and a new signal, enqueue the
4304 signal. Also enqueue the signal if it can't be delivered to the
4305 inferior right now. */
4307 && (lwp
->status_pending_p
4308 || lwp
->pending_signals
!= NULL
4309 || !lwp_signal_can_be_delivered (lwp
)))
4311 enqueue_pending_signal (lwp
, signal
, info
);
4313 /* Postpone any pending signal. It was enqueued above. */
4317 if (lwp
->status_pending_p
)
4320 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4321 " has pending status\n",
4322 lwpid_of (thread
), step
? "step" : "continue",
4323 lwp
->stop_expected
? "expected" : "not expected");
4327 saved_thread
= current_thread
;
4328 current_thread
= thread
;
4330 /* This bit needs some thinking about. If we get a signal that
4331 we must report while a single-step reinsert is still pending,
4332 we often end up resuming the thread. It might be better to
4333 (ew) allow a stack of pending events; then we could be sure that
4334 the reinsert happened right away and not lose any signals.
4336 Making this stack would also shrink the window in which breakpoints are
4337 uninserted (see comment in linux_wait_for_lwp) but not enough for
4338 complete correctness, so it won't solve that problem. It may be
4339 worthwhile just to solve this one, however. */
4340 if (lwp
->bp_reinsert
!= 0)
4343 debug_printf (" pending reinsert at 0x%s\n",
4344 paddress (lwp
->bp_reinsert
));
4346 if (can_hardware_single_step ())
4348 if (fast_tp_collecting
== fast_tpoint_collect_result::not_collecting
)
4351 warning ("BAD - reinserting but not stepping.");
4353 warning ("BAD - reinserting and suspended(%d).",
4358 step
= maybe_hw_step (thread
);
4361 if (fast_tp_collecting
== fast_tpoint_collect_result::before_insn
)
4364 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4365 " (exit-jump-pad-bkpt)\n",
4368 else if (fast_tp_collecting
== fast_tpoint_collect_result::at_insn
)
4371 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4372 " single-stepping\n",
4375 if (can_hardware_single_step ())
4379 internal_error (__FILE__
, __LINE__
,
4380 "moving out of jump pad single-stepping"
4381 " not implemented on this target");
4385 /* If we have while-stepping actions in this thread set it stepping.
4386 If we have a signal to deliver, it may or may not be set to
4387 SIG_IGN, we don't know. Assume so, and allow collecting
4388 while-stepping into a signal handler. A possible smart thing to
4389 do would be to set an internal breakpoint at the signal return
4390 address, continue, and carry on catching this while-stepping
4391 action only when that breakpoint is hit. A future
4393 if (thread
->while_stepping
!= NULL
)
4396 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4399 step
= single_step (lwp
);
4402 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4404 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4406 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4410 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4411 (long) lwp
->stop_pc
);
4415 /* If we have pending signals, consume one if it can be delivered to
4417 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4419 struct pending_signals
**p_sig
;
4421 p_sig
= &lwp
->pending_signals
;
4422 while ((*p_sig
)->prev
!= NULL
)
4423 p_sig
= &(*p_sig
)->prev
;
4425 signal
= (*p_sig
)->signal
;
4426 if ((*p_sig
)->info
.si_signo
!= 0)
4427 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4435 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4436 lwpid_of (thread
), step
? "step" : "continue", signal
,
4437 lwp
->stop_expected
? "expected" : "not expected");
4439 if (the_low_target
.prepare_to_resume
!= NULL
)
4440 the_low_target
.prepare_to_resume (lwp
);
4442 regcache_invalidate_thread (thread
);
4444 lwp
->stepping
= step
;
4446 ptrace_request
= PTRACE_SINGLESTEP
;
4447 else if (gdb_catching_syscalls_p (lwp
))
4448 ptrace_request
= PTRACE_SYSCALL
;
4450 ptrace_request
= PTRACE_CONT
;
4451 ptrace (ptrace_request
,
4453 (PTRACE_TYPE_ARG3
) 0,
4454 /* Coerce to a uintptr_t first to avoid potential gcc warning
4455 of coercing an 8 byte integer to a 4 byte pointer. */
4456 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4458 current_thread
= saved_thread
;
4460 perror_with_name ("resuming thread");
4462 /* Successfully resumed. Clear state that no longer makes sense,
4463 and mark the LWP as running. Must not do this before resuming
4464 otherwise if that fails other code will be confused. E.g., we'd
4465 later try to stop the LWP and hang forever waiting for a stop
4466 status. Note that we must not throw after this is cleared,
4467 otherwise handle_zombie_lwp_error would get confused. */
4469 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4472 /* Called when we try to resume a stopped LWP and that errors out. If
4473 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4474 or about to become), discard the error, clear any pending status
4475 the LWP may have, and return true (we'll collect the exit status
4476 soon enough). Otherwise, return false. */
4479 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4481 struct thread_info
*thread
= get_lwp_thread (lp
);
4483 /* If we get an error after resuming the LWP successfully, we'd
4484 confuse !T state for the LWP being gone. */
4485 gdb_assert (lp
->stopped
);
4487 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4488 because even if ptrace failed with ESRCH, the tracee may be "not
4489 yet fully dead", but already refusing ptrace requests. In that
4490 case the tracee has 'R (Running)' state for a little bit
4491 (observed in Linux 3.18). See also the note on ESRCH in the
4492 ptrace(2) man page. Instead, check whether the LWP has any state
4493 other than ptrace-stopped. */
4495 /* Don't assume anything if /proc/PID/status can't be read. */
4496 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4498 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4499 lp
->status_pending_p
= 0;
4505 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4506 disappears while we try to resume it. */
4509 linux_resume_one_lwp (struct lwp_info
*lwp
,
4510 int step
, int signal
, siginfo_t
*info
)
4514 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4516 CATCH (ex
, RETURN_MASK_ERROR
)
4518 if (!check_ptrace_stopped_lwp_gone (lwp
))
4519 throw_exception (ex
);
4524 /* This function is called once per thread via for_each_thread.
4525 We look up which resume request applies to THREAD and mark it with a
4526 pointer to the appropriate resume request.
4528 This algorithm is O(threads * resume elements), but resume elements
4529 is small (and will remain small at least until GDB supports thread
4533 linux_set_resume_request (thread_info
*thread
, thread_resume
*resume
, size_t n
)
4535 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4537 for (int ndx
= 0; ndx
< n
; ndx
++)
4539 ptid_t ptid
= resume
[ndx
].thread
;
4540 if (ptid
== minus_one_ptid
4541 || ptid
== thread
->id
4542 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4544 || (ptid
.pid () == pid_of (thread
)
4546 || ptid
.lwp () == -1)))
4548 if (resume
[ndx
].kind
== resume_stop
4549 && thread
->last_resume_kind
== resume_stop
)
4552 debug_printf ("already %s LWP %ld at GDB's request\n",
4553 (thread
->last_status
.kind
4554 == TARGET_WAITKIND_STOPPED
)
4562 /* Ignore (wildcard) resume requests for already-resumed
4564 if (resume
[ndx
].kind
!= resume_stop
4565 && thread
->last_resume_kind
!= resume_stop
)
4568 debug_printf ("already %s LWP %ld at GDB's request\n",
4569 (thread
->last_resume_kind
4577 /* Don't let wildcard resumes resume fork children that GDB
4578 does not yet know are new fork children. */
4579 if (lwp
->fork_relative
!= NULL
)
4581 struct lwp_info
*rel
= lwp
->fork_relative
;
4583 if (rel
->status_pending_p
4584 && (rel
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
4585 || rel
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
))
4588 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4594 /* If the thread has a pending event that has already been
4595 reported to GDBserver core, but GDB has not pulled the
4596 event out of the vStopped queue yet, likewise, ignore the
4597 (wildcard) resume request. */
4598 if (in_queued_stop_replies (thread
->id
))
4601 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4606 lwp
->resume
= &resume
[ndx
];
4607 thread
->last_resume_kind
= lwp
->resume
->kind
;
4609 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4610 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4612 /* If we had a deferred signal to report, dequeue one now.
4613 This can happen if LWP gets more than one signal while
4614 trying to get out of a jump pad. */
4616 && !lwp
->status_pending_p
4617 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4619 lwp
->status_pending_p
= 1;
4622 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4623 "leaving status pending.\n",
4624 WSTOPSIG (lwp
->status_pending
),
4632 /* No resume action for this thread. */
4636 /* find_thread callback for linux_resume. Return true if this lwp has an
4637 interesting status pending. */
4640 resume_status_pending_p (thread_info
*thread
)
4642 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4644 /* LWPs which will not be resumed are not interesting, because
4645 we might not wait for them next time through linux_wait. */
4646 if (lwp
->resume
== NULL
)
4649 return thread_still_has_status_pending_p (thread
);
4652 /* Return 1 if this lwp that GDB wants running is stopped at an
4653 internal breakpoint that we need to step over. It assumes that any
4654 required STOP_PC adjustment has already been propagated to the
4655 inferior's regcache. */
4658 need_step_over_p (thread_info
*thread
)
4660 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4661 struct thread_info
*saved_thread
;
4663 struct process_info
*proc
= get_thread_process (thread
);
4665 /* GDBserver is skipping the extra traps from the wrapper program,
4666 don't have to do step over. */
4667 if (proc
->tdesc
== NULL
)
4670 /* LWPs which will not be resumed are not interesting, because we
4671 might not wait for them next time through linux_wait. */
4676 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4681 if (thread
->last_resume_kind
== resume_stop
)
4684 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4690 gdb_assert (lwp
->suspended
>= 0);
4695 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4700 if (lwp
->status_pending_p
)
4703 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4709 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4713 /* If the PC has changed since we stopped, then don't do anything,
4714 and let the breakpoint/tracepoint be hit. This happens if, for
4715 instance, GDB handled the decr_pc_after_break subtraction itself,
4716 GDB is OOL stepping this thread, or the user has issued a "jump"
4717 command, or poked thread's registers herself. */
4718 if (pc
!= lwp
->stop_pc
)
4721 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4722 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4724 paddress (lwp
->stop_pc
), paddress (pc
));
4728 /* On software single step target, resume the inferior with signal
4729 rather than stepping over. */
4730 if (can_software_single_step ()
4731 && lwp
->pending_signals
!= NULL
4732 && lwp_signal_can_be_delivered (lwp
))
4735 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4742 saved_thread
= current_thread
;
4743 current_thread
= thread
;
4745 /* We can only step over breakpoints we know about. */
4746 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4748 /* Don't step over a breakpoint that GDB expects to hit
4749 though. If the condition is being evaluated on the target's side
4750 and it evaluate to false, step over this breakpoint as well. */
4751 if (gdb_breakpoint_here (pc
)
4752 && gdb_condition_true_at_breakpoint (pc
)
4753 && gdb_no_commands_at_breakpoint (pc
))
4756 debug_printf ("Need step over [LWP %ld]? yes, but found"
4757 " GDB breakpoint at 0x%s; skipping step over\n",
4758 lwpid_of (thread
), paddress (pc
));
4760 current_thread
= saved_thread
;
4766 debug_printf ("Need step over [LWP %ld]? yes, "
4767 "found breakpoint at 0x%s\n",
4768 lwpid_of (thread
), paddress (pc
));
4770 /* We've found an lwp that needs stepping over --- return 1 so
4771 that find_thread stops looking. */
4772 current_thread
= saved_thread
;
4778 current_thread
= saved_thread
;
4781 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4783 lwpid_of (thread
), paddress (pc
));
4788 /* Start a step-over operation on LWP. When LWP stopped at a
4789 breakpoint, to make progress, we need to remove the breakpoint out
4790 of the way. If we let other threads run while we do that, they may
4791 pass by the breakpoint location and miss hitting it. To avoid
4792 that, a step-over momentarily stops all threads while LWP is
4793 single-stepped by either hardware or software while the breakpoint
4794 is temporarily uninserted from the inferior. When the single-step
4795 finishes, we reinsert the breakpoint, and let all threads that are
4796 supposed to be running, run again. */
4799 start_step_over (struct lwp_info
*lwp
)
4801 struct thread_info
*thread
= get_lwp_thread (lwp
);
4802 struct thread_info
*saved_thread
;
4807 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4810 stop_all_lwps (1, lwp
);
4812 if (lwp
->suspended
!= 0)
4814 internal_error (__FILE__
, __LINE__
,
4815 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4820 debug_printf ("Done stopping all threads for step-over.\n");
4822 /* Note, we should always reach here with an already adjusted PC,
4823 either by GDB (if we're resuming due to GDB's request), or by our
4824 caller, if we just finished handling an internal breakpoint GDB
4825 shouldn't care about. */
4828 saved_thread
= current_thread
;
4829 current_thread
= thread
;
4831 lwp
->bp_reinsert
= pc
;
4832 uninsert_breakpoints_at (pc
);
4833 uninsert_fast_tracepoint_jumps_at (pc
);
4835 step
= single_step (lwp
);
4837 current_thread
= saved_thread
;
4839 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4841 /* Require next event from this LWP. */
4842 step_over_bkpt
= thread
->id
;
4846 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4847 start_step_over, if still there, and delete any single-step
4848 breakpoints we've set, on non hardware single-step targets. */
4851 finish_step_over (struct lwp_info
*lwp
)
4853 if (lwp
->bp_reinsert
!= 0)
4855 struct thread_info
*saved_thread
= current_thread
;
4858 debug_printf ("Finished step over.\n");
4860 current_thread
= get_lwp_thread (lwp
);
4862 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4863 may be no breakpoint to reinsert there by now. */
4864 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4865 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4867 lwp
->bp_reinsert
= 0;
4869 /* Delete any single-step breakpoints. No longer needed. We
4870 don't have to worry about other threads hitting this trap,
4871 and later not being able to explain it, because we were
4872 stepping over a breakpoint, and we hold all threads but
4873 LWP stopped while doing that. */
4874 if (!can_hardware_single_step ())
4876 gdb_assert (has_single_step_breakpoints (current_thread
));
4877 delete_single_step_breakpoints (current_thread
);
4880 step_over_bkpt
= null_ptid
;
4881 current_thread
= saved_thread
;
4888 /* If there's a step over in progress, wait until all threads stop
4889 (that is, until the stepping thread finishes its step), and
4890 unsuspend all lwps. The stepping thread ends with its status
4891 pending, which is processed later when we get back to processing
4895 complete_ongoing_step_over (void)
4897 if (step_over_bkpt
!= null_ptid
)
4899 struct lwp_info
*lwp
;
4904 debug_printf ("detach: step over in progress, finish it first\n");
4906 /* Passing NULL_PTID as filter indicates we want all events to
4907 be left pending. Eventually this returns when there are no
4908 unwaited-for children left. */
4909 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4911 gdb_assert (ret
== -1);
4913 lwp
= find_lwp_pid (step_over_bkpt
);
4915 finish_step_over (lwp
);
4916 step_over_bkpt
= null_ptid
;
4917 unsuspend_all_lwps (lwp
);
4921 /* This function is called once per thread. We check the thread's resume
4922 request, which will tell us whether to resume, step, or leave the thread
4923 stopped; and what signal, if any, it should be sent.
4925 For threads which we aren't explicitly told otherwise, we preserve
4926 the stepping flag; this is used for stepping over gdbserver-placed
4929 If pending_flags was set in any thread, we queue any needed
4930 signals, since we won't actually resume. We already have a pending
4931 event to report, so we don't need to preserve any step requests;
4932 they should be re-issued if necessary. */
4935 linux_resume_one_thread (thread_info
*thread
, bool leave_all_stopped
)
4937 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4940 if (lwp
->resume
== NULL
)
4943 if (lwp
->resume
->kind
== resume_stop
)
4946 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4951 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
4953 /* Stop the thread, and wait for the event asynchronously,
4954 through the event loop. */
4960 debug_printf ("already stopped LWP %ld\n",
4963 /* The LWP may have been stopped in an internal event that
4964 was not meant to be notified back to GDB (e.g., gdbserver
4965 breakpoint), so we should be reporting a stop event in
4968 /* If the thread already has a pending SIGSTOP, this is a
4969 no-op. Otherwise, something later will presumably resume
4970 the thread and this will cause it to cancel any pending
4971 operation, due to last_resume_kind == resume_stop. If
4972 the thread already has a pending status to report, we
4973 will still report it the next time we wait - see
4974 status_pending_p_callback. */
4976 /* If we already have a pending signal to report, then
4977 there's no need to queue a SIGSTOP, as this means we're
4978 midway through moving the LWP out of the jumppad, and we
4979 will report the pending signal as soon as that is
4981 if (lwp
->pending_signals_to_report
== NULL
)
4985 /* For stop requests, we're done. */
4987 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4991 /* If this thread which is about to be resumed has a pending status,
4992 then don't resume it - we can just report the pending status.
4993 Likewise if it is suspended, because e.g., another thread is
4994 stepping past a breakpoint. Make sure to queue any signals that
4995 would otherwise be sent. In all-stop mode, we do this decision
4996 based on if *any* thread has a pending status. If there's a
4997 thread that needs the step-over-breakpoint dance, then don't
4998 resume any other thread but that particular one. */
4999 leave_pending
= (lwp
->suspended
5000 || lwp
->status_pending_p
5001 || leave_all_stopped
);
5003 /* If we have a new signal, enqueue the signal. */
5004 if (lwp
->resume
->sig
!= 0)
5006 siginfo_t info
, *info_p
;
5008 /* If this is the same signal we were previously stopped by,
5009 make sure to queue its siginfo. */
5010 if (WIFSTOPPED (lwp
->last_status
)
5011 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
5012 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
5013 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
5018 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
5024 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
5026 proceed_one_lwp (thread
, NULL
);
5031 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5034 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5039 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5041 struct thread_info
*need_step_over
= NULL
;
5046 debug_printf ("linux_resume:\n");
5049 for_each_thread ([&] (thread_info
*thread
)
5051 linux_set_resume_request (thread
, resume_info
, n
);
5054 /* If there is a thread which would otherwise be resumed, which has
5055 a pending status, then don't resume any threads - we can just
5056 report the pending status. Make sure to queue any signals that
5057 would otherwise be sent. In non-stop mode, we'll apply this
5058 logic to each thread individually. We consume all pending events
5059 before considering to start a step-over (in all-stop). */
5060 bool any_pending
= false;
5062 any_pending
= find_thread (resume_status_pending_p
) != NULL
;
5064 /* If there is a thread which would otherwise be resumed, which is
5065 stopped at a breakpoint that needs stepping over, then don't
5066 resume any threads - have it step over the breakpoint with all
5067 other threads stopped, then resume all threads again. Make sure
5068 to queue any signals that would otherwise be delivered or
5070 if (!any_pending
&& supports_breakpoints ())
5071 need_step_over
= find_thread (need_step_over_p
);
5073 bool leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5077 if (need_step_over
!= NULL
)
5078 debug_printf ("Not resuming all, need step over\n");
5079 else if (any_pending
)
5080 debug_printf ("Not resuming, all-stop and found "
5081 "an LWP with pending status\n");
5083 debug_printf ("Resuming, no pending status or step over needed\n");
5086 /* Even if we're leaving threads stopped, queue all signals we'd
5087 otherwise deliver. */
5088 for_each_thread ([&] (thread_info
*thread
)
5090 linux_resume_one_thread (thread
, leave_all_stopped
);
5094 start_step_over (get_thread_lwp (need_step_over
));
5098 debug_printf ("linux_resume done\n");
5102 /* We may have events that were pending that can/should be sent to
5103 the client now. Trigger a linux_wait call. */
5104 if (target_is_async_p ())
5108 /* This function is called once per thread. We check the thread's
5109 last resume request, which will tell us whether to resume, step, or
5110 leave the thread stopped. Any signal the client requested to be
5111 delivered has already been enqueued at this point.
5113 If any thread that GDB wants running is stopped at an internal
5114 breakpoint that needs stepping over, we start a step-over operation
5115 on that particular thread, and leave all others stopped. */
5118 proceed_one_lwp (thread_info
*thread
, lwp_info
*except
)
5120 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5127 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5132 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5136 if (thread
->last_resume_kind
== resume_stop
5137 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5140 debug_printf (" client wants LWP to remain %ld stopped\n",
5145 if (lwp
->status_pending_p
)
5148 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5153 gdb_assert (lwp
->suspended
>= 0);
5158 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5162 if (thread
->last_resume_kind
== resume_stop
5163 && lwp
->pending_signals_to_report
== NULL
5164 && (lwp
->collecting_fast_tracepoint
5165 == fast_tpoint_collect_result::not_collecting
))
5167 /* We haven't reported this LWP as stopped yet (otherwise, the
5168 last_status.kind check above would catch it, and we wouldn't
5169 reach here. This LWP may have been momentarily paused by a
5170 stop_all_lwps call while handling for example, another LWP's
5171 step-over. In that case, the pending expected SIGSTOP signal
5172 that was queued at vCont;t handling time will have already
5173 been consumed by wait_for_sigstop, and so we need to requeue
5174 another one here. Note that if the LWP already has a SIGSTOP
5175 pending, this is a no-op. */
5178 debug_printf ("Client wants LWP %ld to stop. "
5179 "Making sure it has a SIGSTOP pending\n",
5185 if (thread
->last_resume_kind
== resume_step
)
5188 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5191 /* If resume_step is requested by GDB, install single-step
5192 breakpoints when the thread is about to be actually resumed if
5193 the single-step breakpoints weren't removed. */
5194 if (can_software_single_step ()
5195 && !has_single_step_breakpoints (thread
))
5196 install_software_single_step_breakpoints (lwp
);
5198 step
= maybe_hw_step (thread
);
5200 else if (lwp
->bp_reinsert
!= 0)
5203 debug_printf (" stepping LWP %ld, reinsert set\n",
5206 step
= maybe_hw_step (thread
);
5211 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5215 unsuspend_and_proceed_one_lwp (thread_info
*thread
, lwp_info
*except
)
5217 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5222 lwp_suspended_decr (lwp
);
5224 proceed_one_lwp (thread
, except
);
5227 /* When we finish a step-over, set threads running again. If there's
5228 another thread that may need a step-over, now's the time to start
5229 it. Eventually, we'll move all threads past their breakpoints. */
5232 proceed_all_lwps (void)
5234 struct thread_info
*need_step_over
;
5236 /* If there is a thread which would otherwise be resumed, which is
5237 stopped at a breakpoint that needs stepping over, then don't
5238 resume any threads - have it step over the breakpoint with all
5239 other threads stopped, then resume all threads again. */
5241 if (supports_breakpoints ())
5243 need_step_over
= find_thread (need_step_over_p
);
5245 if (need_step_over
!= NULL
)
5248 debug_printf ("proceed_all_lwps: found "
5249 "thread %ld needing a step-over\n",
5250 lwpid_of (need_step_over
));
5252 start_step_over (get_thread_lwp (need_step_over
));
5258 debug_printf ("Proceeding, no step-over needed\n");
5260 for_each_thread ([] (thread_info
*thread
)
5262 proceed_one_lwp (thread
, NULL
);
5266 /* Stopped LWPs that the client wanted to be running, that don't have
5267 pending statuses, are set to run again, except for EXCEPT, if not
5268 NULL. This undoes a stop_all_lwps call. */
5271 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5277 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5278 lwpid_of (get_lwp_thread (except
)));
5280 debug_printf ("unstopping all lwps\n");
5284 for_each_thread ([&] (thread_info
*thread
)
5286 unsuspend_and_proceed_one_lwp (thread
, except
);
5289 for_each_thread ([&] (thread_info
*thread
)
5291 proceed_one_lwp (thread
, except
);
5296 debug_printf ("unstop_all_lwps done\n");
5302 #ifdef HAVE_LINUX_REGSETS
5304 #define use_linux_regsets 1
5306 /* Returns true if REGSET has been disabled. */
5309 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5311 return (info
->disabled_regsets
!= NULL
5312 && info
->disabled_regsets
[regset
- info
->regsets
]);
5315 /* Disable REGSET. */
5318 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5322 dr_offset
= regset
- info
->regsets
;
5323 if (info
->disabled_regsets
== NULL
)
5324 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5325 info
->disabled_regsets
[dr_offset
] = 1;
5329 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5330 struct regcache
*regcache
)
5332 struct regset_info
*regset
;
5333 int saw_general_regs
= 0;
5337 pid
= lwpid_of (current_thread
);
5338 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5343 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5346 buf
= xmalloc (regset
->size
);
5348 nt_type
= regset
->nt_type
;
5352 iov
.iov_len
= regset
->size
;
5353 data
= (void *) &iov
;
5359 res
= ptrace (regset
->get_request
, pid
,
5360 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5362 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5368 /* If we get EIO on a regset, do not try it again for
5369 this process mode. */
5370 disable_regset (regsets_info
, regset
);
5372 else if (errno
== ENODATA
)
5374 /* ENODATA may be returned if the regset is currently
5375 not "active". This can happen in normal operation,
5376 so suppress the warning in this case. */
5378 else if (errno
== ESRCH
)
5380 /* At this point, ESRCH should mean the process is
5381 already gone, in which case we simply ignore attempts
5382 to read its registers. */
5387 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5394 if (regset
->type
== GENERAL_REGS
)
5395 saw_general_regs
= 1;
5396 regset
->store_function (regcache
, buf
);
5400 if (saw_general_regs
)
5407 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5408 struct regcache
*regcache
)
5410 struct regset_info
*regset
;
5411 int saw_general_regs
= 0;
5415 pid
= lwpid_of (current_thread
);
5416 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5421 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5422 || regset
->fill_function
== NULL
)
5425 buf
= xmalloc (regset
->size
);
5427 /* First fill the buffer with the current register set contents,
5428 in case there are any items in the kernel's regset that are
5429 not in gdbserver's regcache. */
5431 nt_type
= regset
->nt_type
;
5435 iov
.iov_len
= regset
->size
;
5436 data
= (void *) &iov
;
5442 res
= ptrace (regset
->get_request
, pid
,
5443 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5445 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5450 /* Then overlay our cached registers on that. */
5451 regset
->fill_function (regcache
, buf
);
5453 /* Only now do we write the register set. */
5455 res
= ptrace (regset
->set_request
, pid
,
5456 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5458 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5466 /* If we get EIO on a regset, do not try it again for
5467 this process mode. */
5468 disable_regset (regsets_info
, regset
);
5470 else if (errno
== ESRCH
)
5472 /* At this point, ESRCH should mean the process is
5473 already gone, in which case we simply ignore attempts
5474 to change its registers. See also the related
5475 comment in linux_resume_one_lwp. */
5481 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5484 else if (regset
->type
== GENERAL_REGS
)
5485 saw_general_regs
= 1;
5488 if (saw_general_regs
)
5494 #else /* !HAVE_LINUX_REGSETS */
5496 #define use_linux_regsets 0
5497 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5498 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5502 /* Return 1 if register REGNO is supported by one of the regset ptrace
5503 calls or 0 if it has to be transferred individually. */
5506 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5508 unsigned char mask
= 1 << (regno
% 8);
5509 size_t index
= regno
/ 8;
5511 return (use_linux_regsets
5512 && (regs_info
->regset_bitmap
== NULL
5513 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5516 #ifdef HAVE_LINUX_USRREGS
5519 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5523 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5524 error ("Invalid register number %d.", regnum
);
5526 addr
= usrregs
->regmap
[regnum
];
5531 /* Fetch one register. */
5533 fetch_register (const struct usrregs_info
*usrregs
,
5534 struct regcache
*regcache
, int regno
)
5541 if (regno
>= usrregs
->num_regs
)
5543 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5546 regaddr
= register_addr (usrregs
, regno
);
5550 size
= ((register_size (regcache
->tdesc
, regno
)
5551 + sizeof (PTRACE_XFER_TYPE
) - 1)
5552 & -sizeof (PTRACE_XFER_TYPE
));
5553 buf
= (char *) alloca (size
);
5555 pid
= lwpid_of (current_thread
);
5556 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5559 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5560 ptrace (PTRACE_PEEKUSER
, pid
,
5561 /* Coerce to a uintptr_t first to avoid potential gcc warning
5562 of coercing an 8 byte integer to a 4 byte pointer. */
5563 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5564 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5567 /* Mark register REGNO unavailable. */
5568 supply_register (regcache
, regno
, NULL
);
5573 if (the_low_target
.supply_ptrace_register
)
5574 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5576 supply_register (regcache
, regno
, buf
);
5579 /* Store one register. */
5581 store_register (const struct usrregs_info
*usrregs
,
5582 struct regcache
*regcache
, int regno
)
5589 if (regno
>= usrregs
->num_regs
)
5591 if ((*the_low_target
.cannot_store_register
) (regno
))
5594 regaddr
= register_addr (usrregs
, regno
);
5598 size
= ((register_size (regcache
->tdesc
, regno
)
5599 + sizeof (PTRACE_XFER_TYPE
) - 1)
5600 & -sizeof (PTRACE_XFER_TYPE
));
5601 buf
= (char *) alloca (size
);
5602 memset (buf
, 0, size
);
5604 if (the_low_target
.collect_ptrace_register
)
5605 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5607 collect_register (regcache
, regno
, buf
);
5609 pid
= lwpid_of (current_thread
);
5610 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5613 ptrace (PTRACE_POKEUSER
, pid
,
5614 /* Coerce to a uintptr_t first to avoid potential gcc warning
5615 about coercing an 8 byte integer to a 4 byte pointer. */
5616 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5617 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5620 /* At this point, ESRCH should mean the process is
5621 already gone, in which case we simply ignore attempts
5622 to change its registers. See also the related
5623 comment in linux_resume_one_lwp. */
5627 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5628 error ("writing register %d: %s", regno
, strerror (errno
));
5630 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5634 /* Fetch all registers, or just one, from the child process.
5635 If REGNO is -1, do this for all registers, skipping any that are
5636 assumed to have been retrieved by regsets_fetch_inferior_registers,
5637 unless ALL is non-zero.
5638 Otherwise, REGNO specifies which register (so we can save time). */
5640 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5641 struct regcache
*regcache
, int regno
, int all
)
5643 struct usrregs_info
*usr
= regs_info
->usrregs
;
5647 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5648 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5649 fetch_register (usr
, regcache
, regno
);
5652 fetch_register (usr
, regcache
, regno
);
5655 /* Store our register values back into the inferior.
5656 If REGNO is -1, do this for all registers, skipping any that are
5657 assumed to have been saved by regsets_store_inferior_registers,
5658 unless ALL is non-zero.
5659 Otherwise, REGNO specifies which register (so we can save time). */
5661 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5662 struct regcache
*regcache
, int regno
, int all
)
5664 struct usrregs_info
*usr
= regs_info
->usrregs
;
5668 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5669 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5670 store_register (usr
, regcache
, regno
);
5673 store_register (usr
, regcache
, regno
);
5676 #else /* !HAVE_LINUX_USRREGS */
5678 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5679 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5685 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5689 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5693 if (the_low_target
.fetch_register
!= NULL
5694 && regs_info
->usrregs
!= NULL
)
5695 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5696 (*the_low_target
.fetch_register
) (regcache
, regno
);
5698 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5699 if (regs_info
->usrregs
!= NULL
)
5700 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5704 if (the_low_target
.fetch_register
!= NULL
5705 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5708 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5710 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5712 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5713 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5718 linux_store_registers (struct regcache
*regcache
, int regno
)
5722 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5726 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5728 if (regs_info
->usrregs
!= NULL
)
5729 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5733 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5735 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5737 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5738 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5743 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5744 to debugger memory starting at MYADDR. */
5747 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5749 int pid
= lwpid_of (current_thread
);
5750 PTRACE_XFER_TYPE
*buffer
;
5758 /* Try using /proc. Don't bother for one word. */
5759 if (len
>= 3 * sizeof (long))
5763 /* We could keep this file open and cache it - possibly one per
5764 thread. That requires some juggling, but is even faster. */
5765 sprintf (filename
, "/proc/%d/mem", pid
);
5766 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5770 /* If pread64 is available, use it. It's faster if the kernel
5771 supports it (only one syscall), and it's 64-bit safe even on
5772 32-bit platforms (for instance, SPARC debugging a SPARC64
5775 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5778 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5779 bytes
= read (fd
, myaddr
, len
);
5786 /* Some data was read, we'll try to get the rest with ptrace. */
5796 /* Round starting address down to longword boundary. */
5797 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5798 /* Round ending address up; get number of longwords that makes. */
5799 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5800 / sizeof (PTRACE_XFER_TYPE
));
5801 /* Allocate buffer of that many longwords. */
5802 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5804 /* Read all the longwords */
5806 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5808 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5809 about coercing an 8 byte integer to a 4 byte pointer. */
5810 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5811 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5812 (PTRACE_TYPE_ARG4
) 0);
5818 /* Copy appropriate bytes out of the buffer. */
5821 i
*= sizeof (PTRACE_XFER_TYPE
);
5822 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5824 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5831 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5832 memory at MEMADDR. On failure (cannot write to the inferior)
5833 returns the value of errno. Always succeeds if LEN is zero. */
5836 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5839 /* Round starting address down to longword boundary. */
5840 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5841 /* Round ending address up; get number of longwords that makes. */
5843 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5844 / sizeof (PTRACE_XFER_TYPE
);
5846 /* Allocate buffer of that many longwords. */
5847 PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5849 int pid
= lwpid_of (current_thread
);
5853 /* Zero length write always succeeds. */
5859 /* Dump up to four bytes. */
5860 char str
[4 * 2 + 1];
5862 int dump
= len
< 4 ? len
: 4;
5864 for (i
= 0; i
< dump
; i
++)
5866 sprintf (p
, "%02x", myaddr
[i
]);
5871 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5872 str
, (long) memaddr
, pid
);
5875 /* Fill start and end extra bytes of buffer with existing memory data. */
5878 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5879 about coercing an 8 byte integer to a 4 byte pointer. */
5880 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5881 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5882 (PTRACE_TYPE_ARG4
) 0);
5890 = ptrace (PTRACE_PEEKTEXT
, pid
,
5891 /* Coerce to a uintptr_t first to avoid potential gcc warning
5892 about coercing an 8 byte integer to a 4 byte pointer. */
5893 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5894 * sizeof (PTRACE_XFER_TYPE
)),
5895 (PTRACE_TYPE_ARG4
) 0);
5900 /* Copy data to be written over corresponding part of buffer. */
5902 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5905 /* Write the entire buffer. */
5907 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5910 ptrace (PTRACE_POKETEXT
, pid
,
5911 /* Coerce to a uintptr_t first to avoid potential gcc warning
5912 about coercing an 8 byte integer to a 4 byte pointer. */
5913 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5914 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5923 linux_look_up_symbols (void)
5925 #ifdef USE_THREAD_DB
5926 struct process_info
*proc
= current_process ();
5928 if (proc
->priv
->thread_db
!= NULL
)
5936 linux_request_interrupt (void)
5938 /* Send a SIGINT to the process group. This acts just like the user
5939 typed a ^C on the controlling terminal. */
5940 kill (-signal_pid
, SIGINT
);
5943 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5944 to debugger memory starting at MYADDR. */
5947 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5949 char filename
[PATH_MAX
];
5951 int pid
= lwpid_of (current_thread
);
5953 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5955 fd
= open (filename
, O_RDONLY
);
5959 if (offset
!= (CORE_ADDR
) 0
5960 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5963 n
= read (fd
, myaddr
, len
);
5970 /* These breakpoint and watchpoint related wrapper functions simply
5971 pass on the function call if the target has registered a
5972 corresponding function. */
5975 linux_supports_z_point_type (char z_type
)
5977 return (the_low_target
.supports_z_point_type
!= NULL
5978 && the_low_target
.supports_z_point_type (z_type
));
5982 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5983 int size
, struct raw_breakpoint
*bp
)
5985 if (type
== raw_bkpt_type_sw
)
5986 return insert_memory_breakpoint (bp
);
5987 else if (the_low_target
.insert_point
!= NULL
)
5988 return the_low_target
.insert_point (type
, addr
, size
, bp
);
5990 /* Unsupported (see target.h). */
5995 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5996 int size
, struct raw_breakpoint
*bp
)
5998 if (type
== raw_bkpt_type_sw
)
5999 return remove_memory_breakpoint (bp
);
6000 else if (the_low_target
.remove_point
!= NULL
)
6001 return the_low_target
.remove_point (type
, addr
, size
, bp
);
6003 /* Unsupported (see target.h). */
6007 /* Implement the to_stopped_by_sw_breakpoint target_ops
6011 linux_stopped_by_sw_breakpoint (void)
6013 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6015 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
6018 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
6022 linux_supports_stopped_by_sw_breakpoint (void)
6024 return USE_SIGTRAP_SIGINFO
;
6027 /* Implement the to_stopped_by_hw_breakpoint target_ops
6031 linux_stopped_by_hw_breakpoint (void)
6033 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6035 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6038 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6042 linux_supports_stopped_by_hw_breakpoint (void)
6044 return USE_SIGTRAP_SIGINFO
;
6047 /* Implement the supports_hardware_single_step target_ops method. */
6050 linux_supports_hardware_single_step (void)
6052 return can_hardware_single_step ();
6056 linux_supports_software_single_step (void)
6058 return can_software_single_step ();
6062 linux_stopped_by_watchpoint (void)
6064 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6066 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6070 linux_stopped_data_address (void)
6072 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6074 return lwp
->stopped_data_address
;
6077 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6078 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6079 && defined(PT_TEXT_END_ADDR)
6081 /* This is only used for targets that define PT_TEXT_ADDR,
6082 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6083 the target has different ways of acquiring this information, like
6086 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6087 to tell gdb about. */
6090 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6092 unsigned long text
, text_end
, data
;
6093 int pid
= lwpid_of (current_thread
);
6097 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6098 (PTRACE_TYPE_ARG4
) 0);
6099 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6100 (PTRACE_TYPE_ARG4
) 0);
6101 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6102 (PTRACE_TYPE_ARG4
) 0);
6106 /* Both text and data offsets produced at compile-time (and so
6107 used by gdb) are relative to the beginning of the program,
6108 with the data segment immediately following the text segment.
6109 However, the actual runtime layout in memory may put the data
6110 somewhere else, so when we send gdb a data base-address, we
6111 use the real data base address and subtract the compile-time
6112 data base-address from it (which is just the length of the
6113 text segment). BSS immediately follows data in both
6116 *data_p
= data
- (text_end
- text
);
6125 linux_qxfer_osdata (const char *annex
,
6126 unsigned char *readbuf
, unsigned const char *writebuf
,
6127 CORE_ADDR offset
, int len
)
6129 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6132 /* Convert a native/host siginfo object, into/from the siginfo in the
6133 layout of the inferiors' architecture. */
6136 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6140 if (the_low_target
.siginfo_fixup
!= NULL
)
6141 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6143 /* If there was no callback, or the callback didn't do anything,
6144 then just do a straight memcpy. */
6148 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6150 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6155 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6156 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6160 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6162 if (current_thread
== NULL
)
6165 pid
= lwpid_of (current_thread
);
6168 debug_printf ("%s siginfo for lwp %d.\n",
6169 readbuf
!= NULL
? "Reading" : "Writing",
6172 if (offset
>= sizeof (siginfo
))
6175 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6178 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6179 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6180 inferior with a 64-bit GDBSERVER should look the same as debugging it
6181 with a 32-bit GDBSERVER, we need to convert it. */
6182 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6184 if (offset
+ len
> sizeof (siginfo
))
6185 len
= sizeof (siginfo
) - offset
;
6187 if (readbuf
!= NULL
)
6188 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6191 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6193 /* Convert back to ptrace layout before flushing it out. */
6194 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6196 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6203 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6204 so we notice when children change state; as the handler for the
6205 sigsuspend in my_waitpid. */
6208 sigchld_handler (int signo
)
6210 int old_errno
= errno
;
6216 /* fprintf is not async-signal-safe, so call write
6218 if (write (2, "sigchld_handler\n",
6219 sizeof ("sigchld_handler\n") - 1) < 0)
6220 break; /* just ignore */
6224 if (target_is_async_p ())
6225 async_file_mark (); /* trigger a linux_wait */
6231 linux_supports_non_stop (void)
6237 linux_async (int enable
)
6239 int previous
= target_is_async_p ();
6242 debug_printf ("linux_async (%d), previous=%d\n",
6245 if (previous
!= enable
)
6248 sigemptyset (&mask
);
6249 sigaddset (&mask
, SIGCHLD
);
6251 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6255 if (pipe (linux_event_pipe
) == -1)
6257 linux_event_pipe
[0] = -1;
6258 linux_event_pipe
[1] = -1;
6259 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6261 warning ("creating event pipe failed.");
6265 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6266 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6268 /* Register the event loop handler. */
6269 add_file_handler (linux_event_pipe
[0],
6270 handle_target_event
, NULL
);
6272 /* Always trigger a linux_wait. */
6277 delete_file_handler (linux_event_pipe
[0]);
6279 close (linux_event_pipe
[0]);
6280 close (linux_event_pipe
[1]);
6281 linux_event_pipe
[0] = -1;
6282 linux_event_pipe
[1] = -1;
6285 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6292 linux_start_non_stop (int nonstop
)
6294 /* Register or unregister from event-loop accordingly. */
6295 linux_async (nonstop
);
6297 if (target_is_async_p () != (nonstop
!= 0))
6304 linux_supports_multi_process (void)
6309 /* Check if fork events are supported. */
6312 linux_supports_fork_events (void)
6314 return linux_supports_tracefork ();
6317 /* Check if vfork events are supported. */
6320 linux_supports_vfork_events (void)
6322 return linux_supports_tracefork ();
6325 /* Check if exec events are supported. */
6328 linux_supports_exec_events (void)
6330 return linux_supports_traceexec ();
6333 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6334 ptrace flags for all inferiors. This is in case the new GDB connection
6335 doesn't support the same set of events that the previous one did. */
6338 linux_handle_new_gdb_connection (void)
6340 /* Request that all the lwps reset their ptrace options. */
6341 for_each_thread ([] (thread_info
*thread
)
6343 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6347 /* Stop the lwp so we can modify its ptrace options. */
6348 lwp
->must_set_ptrace_flags
= 1;
6349 linux_stop_lwp (lwp
);
6353 /* Already stopped; go ahead and set the ptrace options. */
6354 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6355 int options
= linux_low_ptrace_options (proc
->attached
);
6357 linux_enable_event_reporting (lwpid_of (thread
), options
);
6358 lwp
->must_set_ptrace_flags
= 0;
6364 linux_supports_disable_randomization (void)
6366 #ifdef HAVE_PERSONALITY
6374 linux_supports_agent (void)
6380 linux_supports_range_stepping (void)
6382 if (can_software_single_step ())
6384 if (*the_low_target
.supports_range_stepping
== NULL
)
6387 return (*the_low_target
.supports_range_stepping
) ();
6390 /* Enumerate spufs IDs for process PID. */
6392 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6398 struct dirent
*entry
;
6400 sprintf (path
, "/proc/%ld/fd", pid
);
6401 dir
= opendir (path
);
6406 while ((entry
= readdir (dir
)) != NULL
)
6412 fd
= atoi (entry
->d_name
);
6416 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6417 if (stat (path
, &st
) != 0)
6419 if (!S_ISDIR (st
.st_mode
))
6422 if (statfs (path
, &stfs
) != 0)
6424 if (stfs
.f_type
!= SPUFS_MAGIC
)
6427 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6429 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6439 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6440 object type, using the /proc file system. */
6442 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6443 unsigned const char *writebuf
,
6444 CORE_ADDR offset
, int len
)
6446 long pid
= lwpid_of (current_thread
);
6451 if (!writebuf
&& !readbuf
)
6459 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6462 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6463 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6468 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6475 ret
= write (fd
, writebuf
, (size_t) len
);
6477 ret
= read (fd
, readbuf
, (size_t) len
);
6483 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6484 struct target_loadseg
6486 /* Core address to which the segment is mapped. */
6488 /* VMA recorded in the program header. */
6490 /* Size of this segment in memory. */
6494 # if defined PT_GETDSBT
6495 struct target_loadmap
6497 /* Protocol version number, must be zero. */
6499 /* Pointer to the DSBT table, its size, and the DSBT index. */
6500 unsigned *dsbt_table
;
6501 unsigned dsbt_size
, dsbt_index
;
6502 /* Number of segments in this map. */
6504 /* The actual memory map. */
6505 struct target_loadseg segs
[/*nsegs*/];
6507 # define LINUX_LOADMAP PT_GETDSBT
6508 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6509 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6511 struct target_loadmap
6513 /* Protocol version number, must be zero. */
6515 /* Number of segments in this map. */
6517 /* The actual memory map. */
6518 struct target_loadseg segs
[/*nsegs*/];
6520 # define LINUX_LOADMAP PTRACE_GETFDPIC
6521 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6522 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6526 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6527 unsigned char *myaddr
, unsigned int len
)
6529 int pid
= lwpid_of (current_thread
);
6531 struct target_loadmap
*data
= NULL
;
6532 unsigned int actual_length
, copy_length
;
6534 if (strcmp (annex
, "exec") == 0)
6535 addr
= (int) LINUX_LOADMAP_EXEC
;
6536 else if (strcmp (annex
, "interp") == 0)
6537 addr
= (int) LINUX_LOADMAP_INTERP
;
6541 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6547 actual_length
= sizeof (struct target_loadmap
)
6548 + sizeof (struct target_loadseg
) * data
->nsegs
;
6550 if (offset
< 0 || offset
> actual_length
)
6553 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6554 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6558 # define linux_read_loadmap NULL
6559 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6562 linux_process_qsupported (char **features
, int count
)
6564 if (the_low_target
.process_qsupported
!= NULL
)
6565 the_low_target
.process_qsupported (features
, count
);
6569 linux_supports_catch_syscall (void)
6571 return (the_low_target
.get_syscall_trapinfo
!= NULL
6572 && linux_supports_tracesysgood ());
6576 linux_get_ipa_tdesc_idx (void)
6578 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6581 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6585 linux_supports_tracepoints (void)
6587 if (*the_low_target
.supports_tracepoints
== NULL
)
6590 return (*the_low_target
.supports_tracepoints
) ();
6594 linux_read_pc (struct regcache
*regcache
)
6596 if (the_low_target
.get_pc
== NULL
)
6599 return (*the_low_target
.get_pc
) (regcache
);
6603 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6605 gdb_assert (the_low_target
.set_pc
!= NULL
);
6607 (*the_low_target
.set_pc
) (regcache
, pc
);
6611 linux_thread_stopped (struct thread_info
*thread
)
6613 return get_thread_lwp (thread
)->stopped
;
6616 /* This exposes stop-all-threads functionality to other modules. */
6619 linux_pause_all (int freeze
)
6621 stop_all_lwps (freeze
, NULL
);
6624 /* This exposes unstop-all-threads functionality to other gdbserver
6628 linux_unpause_all (int unfreeze
)
6630 unstop_all_lwps (unfreeze
, NULL
);
6634 linux_prepare_to_access_memory (void)
6636 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6639 linux_pause_all (1);
6644 linux_done_accessing_memory (void)
6646 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6649 linux_unpause_all (1);
6653 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6654 CORE_ADDR collector
,
6657 CORE_ADDR
*jump_entry
,
6658 CORE_ADDR
*trampoline
,
6659 ULONGEST
*trampoline_size
,
6660 unsigned char *jjump_pad_insn
,
6661 ULONGEST
*jjump_pad_insn_size
,
6662 CORE_ADDR
*adjusted_insn_addr
,
6663 CORE_ADDR
*adjusted_insn_addr_end
,
6666 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6667 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6668 jump_entry
, trampoline
, trampoline_size
,
6669 jjump_pad_insn
, jjump_pad_insn_size
,
6670 adjusted_insn_addr
, adjusted_insn_addr_end
,
6674 static struct emit_ops
*
6675 linux_emit_ops (void)
6677 if (the_low_target
.emit_ops
!= NULL
)
6678 return (*the_low_target
.emit_ops
) ();
6684 linux_get_min_fast_tracepoint_insn_len (void)
6686 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6689 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6692 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6693 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6695 char filename
[PATH_MAX
];
6697 const int auxv_size
= is_elf64
6698 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6699 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6701 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6703 fd
= open (filename
, O_RDONLY
);
6709 while (read (fd
, buf
, auxv_size
) == auxv_size
6710 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6714 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6716 switch (aux
->a_type
)
6719 *phdr_memaddr
= aux
->a_un
.a_val
;
6722 *num_phdr
= aux
->a_un
.a_val
;
6728 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6730 switch (aux
->a_type
)
6733 *phdr_memaddr
= aux
->a_un
.a_val
;
6736 *num_phdr
= aux
->a_un
.a_val
;
6744 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6746 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6747 "phdr_memaddr = %ld, phdr_num = %d",
6748 (long) *phdr_memaddr
, *num_phdr
);
6755 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6758 get_dynamic (const int pid
, const int is_elf64
)
6760 CORE_ADDR phdr_memaddr
, relocation
;
6762 unsigned char *phdr_buf
;
6763 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6765 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6768 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6769 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6771 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6774 /* Compute relocation: it is expected to be 0 for "regular" executables,
6775 non-zero for PIE ones. */
6777 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6780 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6782 if (p
->p_type
== PT_PHDR
)
6783 relocation
= phdr_memaddr
- p
->p_vaddr
;
6787 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6789 if (p
->p_type
== PT_PHDR
)
6790 relocation
= phdr_memaddr
- p
->p_vaddr
;
6793 if (relocation
== -1)
6795 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6796 any real world executables, including PIE executables, have always
6797 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6798 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6799 or present DT_DEBUG anyway (fpc binaries are statically linked).
6801 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6803 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6808 for (i
= 0; i
< num_phdr
; i
++)
6812 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6814 if (p
->p_type
== PT_DYNAMIC
)
6815 return p
->p_vaddr
+ relocation
;
6819 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6821 if (p
->p_type
== PT_DYNAMIC
)
6822 return p
->p_vaddr
+ relocation
;
6829 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6830 can be 0 if the inferior does not yet have the library list initialized.
6831 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6832 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6835 get_r_debug (const int pid
, const int is_elf64
)
6837 CORE_ADDR dynamic_memaddr
;
6838 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6839 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6842 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6843 if (dynamic_memaddr
== 0)
6846 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6850 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6851 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6855 unsigned char buf
[sizeof (Elf64_Xword
)];
6859 #ifdef DT_MIPS_RLD_MAP
6860 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6862 if (linux_read_memory (dyn
->d_un
.d_val
,
6863 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6868 #endif /* DT_MIPS_RLD_MAP */
6869 #ifdef DT_MIPS_RLD_MAP_REL
6870 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6872 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6873 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6878 #endif /* DT_MIPS_RLD_MAP_REL */
6880 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6881 map
= dyn
->d_un
.d_val
;
6883 if (dyn
->d_tag
== DT_NULL
)
6888 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6889 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6893 unsigned char buf
[sizeof (Elf32_Word
)];
6897 #ifdef DT_MIPS_RLD_MAP
6898 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6900 if (linux_read_memory (dyn
->d_un
.d_val
,
6901 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6906 #endif /* DT_MIPS_RLD_MAP */
6907 #ifdef DT_MIPS_RLD_MAP_REL
6908 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6910 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6911 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6916 #endif /* DT_MIPS_RLD_MAP_REL */
6918 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6919 map
= dyn
->d_un
.d_val
;
6921 if (dyn
->d_tag
== DT_NULL
)
6925 dynamic_memaddr
+= dyn_size
;
6931 /* Read one pointer from MEMADDR in the inferior. */
6934 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6938 /* Go through a union so this works on either big or little endian
6939 hosts, when the inferior's pointer size is smaller than the size
6940 of CORE_ADDR. It is assumed the inferior's endianness is the
6941 same of the superior's. */
6944 CORE_ADDR core_addr
;
6949 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6952 if (ptr_size
== sizeof (CORE_ADDR
))
6953 *ptr
= addr
.core_addr
;
6954 else if (ptr_size
== sizeof (unsigned int))
6957 gdb_assert_not_reached ("unhandled pointer size");
6962 struct link_map_offsets
6964 /* Offset and size of r_debug.r_version. */
6965 int r_version_offset
;
6967 /* Offset and size of r_debug.r_map. */
6970 /* Offset to l_addr field in struct link_map. */
6973 /* Offset to l_name field in struct link_map. */
6976 /* Offset to l_ld field in struct link_map. */
6979 /* Offset to l_next field in struct link_map. */
6982 /* Offset to l_prev field in struct link_map. */
6986 /* Construct qXfer:libraries-svr4:read reply. */
6989 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
6990 unsigned const char *writebuf
,
6991 CORE_ADDR offset
, int len
)
6993 struct process_info_private
*const priv
= current_process ()->priv
;
6994 char filename
[PATH_MAX
];
6997 static const struct link_map_offsets lmo_32bit_offsets
=
6999 0, /* r_version offset. */
7000 4, /* r_debug.r_map offset. */
7001 0, /* l_addr offset in link_map. */
7002 4, /* l_name offset in link_map. */
7003 8, /* l_ld offset in link_map. */
7004 12, /* l_next offset in link_map. */
7005 16 /* l_prev offset in link_map. */
7008 static const struct link_map_offsets lmo_64bit_offsets
=
7010 0, /* r_version offset. */
7011 8, /* r_debug.r_map offset. */
7012 0, /* l_addr offset in link_map. */
7013 8, /* l_name offset in link_map. */
7014 16, /* l_ld offset in link_map. */
7015 24, /* l_next offset in link_map. */
7016 32 /* l_prev offset in link_map. */
7018 const struct link_map_offsets
*lmo
;
7019 unsigned int machine
;
7021 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7022 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7023 int header_done
= 0;
7025 if (writebuf
!= NULL
)
7027 if (readbuf
== NULL
)
7030 pid
= lwpid_of (current_thread
);
7031 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7032 is_elf64
= elf_64_file_p (filename
, &machine
);
7033 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7034 ptr_size
= is_elf64
? 8 : 4;
7036 while (annex
[0] != '\0')
7042 sep
= strchr (annex
, '=');
7047 if (len
== 5 && startswith (annex
, "start"))
7049 else if (len
== 4 && startswith (annex
, "prev"))
7053 annex
= strchr (sep
, ';');
7060 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7067 if (priv
->r_debug
== 0)
7068 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7070 /* We failed to find DT_DEBUG. Such situation will not change
7071 for this inferior - do not retry it. Report it to GDB as
7072 E01, see for the reasons at the GDB solib-svr4.c side. */
7073 if (priv
->r_debug
== (CORE_ADDR
) -1)
7076 if (priv
->r_debug
!= 0)
7078 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7079 (unsigned char *) &r_version
,
7080 sizeof (r_version
)) != 0
7083 warning ("unexpected r_debug version %d", r_version
);
7085 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7086 &lm_addr
, ptr_size
) != 0)
7088 warning ("unable to read r_map from 0x%lx",
7089 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7094 std::string document
= "<library-list-svr4 version=\"1.0\"";
7097 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7098 &l_name
, ptr_size
) == 0
7099 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7100 &l_addr
, ptr_size
) == 0
7101 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7102 &l_ld
, ptr_size
) == 0
7103 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7104 &l_prev
, ptr_size
) == 0
7105 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7106 &l_next
, ptr_size
) == 0)
7108 unsigned char libname
[PATH_MAX
];
7110 if (lm_prev
!= l_prev
)
7112 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7113 (long) lm_prev
, (long) l_prev
);
7117 /* Ignore the first entry even if it has valid name as the first entry
7118 corresponds to the main executable. The first entry should not be
7119 skipped if the dynamic loader was loaded late by a static executable
7120 (see solib-svr4.c parameter ignore_first). But in such case the main
7121 executable does not have PT_DYNAMIC present and this function already
7122 exited above due to failed get_r_debug. */
7124 string_appendf (document
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7127 /* Not checking for error because reading may stop before
7128 we've got PATH_MAX worth of characters. */
7130 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7131 libname
[sizeof (libname
) - 1] = '\0';
7132 if (libname
[0] != '\0')
7136 /* Terminate `<library-list-svr4'. */
7141 string_appendf (document
, "<library name=\"");
7142 xml_escape_text_append (&document
, (char *) libname
);
7143 string_appendf (document
, "\" lm=\"0x%lx\" "
7144 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7145 (unsigned long) lm_addr
, (unsigned long) l_addr
,
7146 (unsigned long) l_ld
);
7156 /* Empty list; terminate `<library-list-svr4'. */
7160 document
+= "</library-list-svr4>";
7162 int document_len
= document
.length ();
7163 if (offset
< document_len
)
7164 document_len
-= offset
;
7167 if (len
> document_len
)
7170 memcpy (readbuf
, document
.data () + offset
, len
);
7175 #ifdef HAVE_LINUX_BTRACE
7177 /* See to_disable_btrace target method. */
7180 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7182 enum btrace_error err
;
7184 err
= linux_disable_btrace (tinfo
);
7185 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7188 /* Encode an Intel Processor Trace configuration. */
7191 linux_low_encode_pt_config (struct buffer
*buffer
,
7192 const struct btrace_data_pt_config
*config
)
7194 buffer_grow_str (buffer
, "<pt-config>\n");
7196 switch (config
->cpu
.vendor
)
7199 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7200 "model=\"%u\" stepping=\"%u\"/>\n",
7201 config
->cpu
.family
, config
->cpu
.model
,
7202 config
->cpu
.stepping
);
7209 buffer_grow_str (buffer
, "</pt-config>\n");
7212 /* Encode a raw buffer. */
7215 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7221 /* We use hex encoding - see common/rsp-low.h. */
7222 buffer_grow_str (buffer
, "<raw>\n");
7228 elem
[0] = tohex ((*data
>> 4) & 0xf);
7229 elem
[1] = tohex (*data
++ & 0xf);
7231 buffer_grow (buffer
, elem
, 2);
7234 buffer_grow_str (buffer
, "</raw>\n");
7237 /* See to_read_btrace target method. */
7240 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7241 enum btrace_read_type type
)
7243 struct btrace_data btrace
;
7244 struct btrace_block
*block
;
7245 enum btrace_error err
;
7248 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7249 if (err
!= BTRACE_ERR_NONE
)
7251 if (err
== BTRACE_ERR_OVERFLOW
)
7252 buffer_grow_str0 (buffer
, "E.Overflow.");
7254 buffer_grow_str0 (buffer
, "E.Generic Error.");
7259 switch (btrace
.format
)
7261 case BTRACE_FORMAT_NONE
:
7262 buffer_grow_str0 (buffer
, "E.No Trace.");
7265 case BTRACE_FORMAT_BTS
:
7266 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7267 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7270 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7272 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7273 paddress (block
->begin
), paddress (block
->end
));
7275 buffer_grow_str0 (buffer
, "</btrace>\n");
7278 case BTRACE_FORMAT_PT
:
7279 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7280 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7281 buffer_grow_str (buffer
, "<pt>\n");
7283 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7285 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7286 btrace
.variant
.pt
.size
);
7288 buffer_grow_str (buffer
, "</pt>\n");
7289 buffer_grow_str0 (buffer
, "</btrace>\n");
7293 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7300 /* See to_btrace_conf target method. */
7303 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7304 struct buffer
*buffer
)
7306 const struct btrace_config
*conf
;
7308 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7309 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7311 conf
= linux_btrace_conf (tinfo
);
7314 switch (conf
->format
)
7316 case BTRACE_FORMAT_NONE
:
7319 case BTRACE_FORMAT_BTS
:
7320 buffer_xml_printf (buffer
, "<bts");
7321 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7322 buffer_xml_printf (buffer
, " />\n");
7325 case BTRACE_FORMAT_PT
:
7326 buffer_xml_printf (buffer
, "<pt");
7327 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7328 buffer_xml_printf (buffer
, "/>\n");
7333 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7336 #endif /* HAVE_LINUX_BTRACE */
7338 /* See nat/linux-nat.h. */
7341 current_lwp_ptid (void)
7343 return ptid_of (current_thread
);
7346 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7349 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7351 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7352 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7354 return default_breakpoint_kind_from_pc (pcptr
);
7357 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7359 static const gdb_byte
*
7360 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7362 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7364 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7367 /* Implementation of the target_ops method
7368 "breakpoint_kind_from_current_state". */
7371 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7373 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7374 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7376 return linux_breakpoint_kind_from_pc (pcptr
);
7379 /* Default implementation of linux_target_ops method "set_pc" for
7380 32-bit pc register which is literally named "pc". */
7383 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7385 uint32_t newpc
= pc
;
7387 supply_register_by_name (regcache
, "pc", &newpc
);
7390 /* Default implementation of linux_target_ops method "get_pc" for
7391 32-bit pc register which is literally named "pc". */
7394 linux_get_pc_32bit (struct regcache
*regcache
)
7398 collect_register_by_name (regcache
, "pc", &pc
);
7400 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7404 /* Default implementation of linux_target_ops method "set_pc" for
7405 64-bit pc register which is literally named "pc". */
7408 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7410 uint64_t newpc
= pc
;
7412 supply_register_by_name (regcache
, "pc", &newpc
);
7415 /* Default implementation of linux_target_ops method "get_pc" for
7416 64-bit pc register which is literally named "pc". */
7419 linux_get_pc_64bit (struct regcache
*regcache
)
7423 collect_register_by_name (regcache
, "pc", &pc
);
7425 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7430 static struct target_ops linux_target_ops
= {
7431 linux_create_inferior
,
7432 linux_post_create_inferior
,
7441 linux_fetch_registers
,
7442 linux_store_registers
,
7443 linux_prepare_to_access_memory
,
7444 linux_done_accessing_memory
,
7447 linux_look_up_symbols
,
7448 linux_request_interrupt
,
7450 linux_supports_z_point_type
,
7453 linux_stopped_by_sw_breakpoint
,
7454 linux_supports_stopped_by_sw_breakpoint
,
7455 linux_stopped_by_hw_breakpoint
,
7456 linux_supports_stopped_by_hw_breakpoint
,
7457 linux_supports_hardware_single_step
,
7458 linux_stopped_by_watchpoint
,
7459 linux_stopped_data_address
,
7460 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7461 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7462 && defined(PT_TEXT_END_ADDR)
7467 #ifdef USE_THREAD_DB
7468 thread_db_get_tls_address
,
7473 hostio_last_error_from_errno
,
7476 linux_supports_non_stop
,
7478 linux_start_non_stop
,
7479 linux_supports_multi_process
,
7480 linux_supports_fork_events
,
7481 linux_supports_vfork_events
,
7482 linux_supports_exec_events
,
7483 linux_handle_new_gdb_connection
,
7484 #ifdef USE_THREAD_DB
7485 thread_db_handle_monitor_command
,
7489 linux_common_core_of_thread
,
7491 linux_process_qsupported
,
7492 linux_supports_tracepoints
,
7495 linux_thread_stopped
,
7499 linux_stabilize_threads
,
7500 linux_install_fast_tracepoint_jump_pad
,
7502 linux_supports_disable_randomization
,
7503 linux_get_min_fast_tracepoint_insn_len
,
7504 linux_qxfer_libraries_svr4
,
7505 linux_supports_agent
,
7506 #ifdef HAVE_LINUX_BTRACE
7507 linux_enable_btrace
,
7508 linux_low_disable_btrace
,
7509 linux_low_read_btrace
,
7510 linux_low_btrace_conf
,
7517 linux_supports_range_stepping
,
7518 linux_proc_pid_to_exec_file
,
7519 linux_mntns_open_cloexec
,
7521 linux_mntns_readlink
,
7522 linux_breakpoint_kind_from_pc
,
7523 linux_sw_breakpoint_from_kind
,
7524 linux_proc_tid_get_name
,
7525 linux_breakpoint_kind_from_current_state
,
7526 linux_supports_software_single_step
,
7527 linux_supports_catch_syscall
,
7528 linux_get_ipa_tdesc_idx
,
7530 thread_db_thread_handle
,
7536 #ifdef HAVE_LINUX_REGSETS
7538 initialize_regsets_info (struct regsets_info
*info
)
7540 for (info
->num_regsets
= 0;
7541 info
->regsets
[info
->num_regsets
].size
>= 0;
7542 info
->num_regsets
++)
7548 initialize_low (void)
7550 struct sigaction sigchld_action
;
7552 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7553 set_target_ops (&linux_target_ops
);
7555 linux_ptrace_init_warnings ();
7556 linux_proc_init_warnings ();
7558 sigchld_action
.sa_handler
= sigchld_handler
;
7559 sigemptyset (&sigchld_action
.sa_mask
);
7560 sigchld_action
.sa_flags
= SA_RESTART
;
7561 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7563 initialize_low_arch ();
7565 linux_check_ptrace_features ();