1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2017 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"
54 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
55 then ELFMAG0 will have been defined. If it didn't get included by
56 gdb_proc_service.h then including it will likely introduce a duplicate
57 definition of elf_fpregset_t. */
60 #include "nat/linux-namespaces.h"
63 #define SPUFS_MAGIC 0x23c9b64e
66 #ifdef HAVE_PERSONALITY
67 # include <sys/personality.h>
68 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
69 # define ADDR_NO_RANDOMIZE 0x0040000
77 /* Some targets did not define these ptrace constants from the start,
78 so gdbserver defines them locally here. In the future, these may
79 be removed after they are added to asm/ptrace.h. */
80 #if !(defined(PT_TEXT_ADDR) \
81 || defined(PT_DATA_ADDR) \
82 || defined(PT_TEXT_END_ADDR))
83 #if defined(__mcoldfire__)
84 /* These are still undefined in 3.10 kernels. */
85 #define PT_TEXT_ADDR 49*4
86 #define PT_DATA_ADDR 50*4
87 #define PT_TEXT_END_ADDR 51*4
88 /* BFIN already defines these since at least 2.6.32 kernels. */
90 #define PT_TEXT_ADDR 220
91 #define PT_TEXT_END_ADDR 224
92 #define PT_DATA_ADDR 228
93 /* These are still undefined in 3.10 kernels. */
94 #elif defined(__TMS320C6X__)
95 #define PT_TEXT_ADDR (0x10000*4)
96 #define PT_DATA_ADDR (0x10004*4)
97 #define PT_TEXT_END_ADDR (0x10008*4)
101 #ifdef HAVE_LINUX_BTRACE
102 # include "nat/linux-btrace.h"
103 # include "btrace-common.h"
106 #ifndef HAVE_ELF32_AUXV_T
107 /* Copied from glibc's elf.h. */
110 uint32_t a_type
; /* Entry type */
113 uint32_t a_val
; /* Integer value */
114 /* We use to have pointer elements added here. We cannot do that,
115 though, since it does not work when using 32-bit definitions
116 on 64-bit platforms and vice versa. */
121 #ifndef HAVE_ELF64_AUXV_T
122 /* Copied from glibc's elf.h. */
125 uint64_t a_type
; /* Entry type */
128 uint64_t a_val
; /* Integer value */
129 /* We use to have pointer elements added here. We cannot do that,
130 though, since it does not work when using 32-bit definitions
131 on 64-bit platforms and vice versa. */
136 /* Does the current host support PTRACE_GETREGSET? */
137 int have_ptrace_getregset
= -1;
141 /* See nat/linux-nat.h. */
144 ptid_of_lwp (struct lwp_info
*lwp
)
146 return ptid_of (get_lwp_thread (lwp
));
149 /* See nat/linux-nat.h. */
152 lwp_set_arch_private_info (struct lwp_info
*lwp
,
153 struct arch_lwp_info
*info
)
155 lwp
->arch_private
= info
;
158 /* See nat/linux-nat.h. */
160 struct arch_lwp_info
*
161 lwp_arch_private_info (struct lwp_info
*lwp
)
163 return lwp
->arch_private
;
166 /* See nat/linux-nat.h. */
169 lwp_is_stopped (struct lwp_info
*lwp
)
174 /* See nat/linux-nat.h. */
176 enum target_stop_reason
177 lwp_stop_reason (struct lwp_info
*lwp
)
179 return lwp
->stop_reason
;
182 /* See nat/linux-nat.h. */
185 lwp_is_stepping (struct lwp_info
*lwp
)
187 return lwp
->stepping
;
190 /* A list of all unknown processes which receive stop signals. Some
191 other process will presumably claim each of these as forked
192 children momentarily. */
194 struct simple_pid_list
196 /* The process ID. */
199 /* The status as reported by waitpid. */
203 struct simple_pid_list
*next
;
205 struct simple_pid_list
*stopped_pids
;
207 /* Trivial list manipulation functions to keep track of a list of new
208 stopped processes. */
211 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
213 struct simple_pid_list
*new_pid
= XNEW (struct simple_pid_list
);
216 new_pid
->status
= status
;
217 new_pid
->next
= *listp
;
222 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
224 struct simple_pid_list
**p
;
226 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
227 if ((*p
)->pid
== pid
)
229 struct simple_pid_list
*next
= (*p
)->next
;
231 *statusp
= (*p
)->status
;
239 enum stopping_threads_kind
241 /* Not stopping threads presently. */
242 NOT_STOPPING_THREADS
,
244 /* Stopping threads. */
247 /* Stopping and suspending threads. */
248 STOPPING_AND_SUSPENDING_THREADS
251 /* This is set while stop_all_lwps is in effect. */
252 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
254 /* FIXME make into a target method? */
255 int using_threads
= 1;
257 /* True if we're presently stabilizing threads (moving them out of
259 static int stabilizing_threads
;
261 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
262 int step
, int signal
, siginfo_t
*info
);
263 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
264 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
265 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
266 static void unsuspend_all_lwps (struct lwp_info
*except
);
267 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
268 int *wstat
, int options
);
269 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
270 static struct lwp_info
*add_lwp (ptid_t ptid
);
271 static void linux_mourn (struct process_info
*process
);
272 static int linux_stopped_by_watchpoint (void);
273 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
274 static int lwp_is_marked_dead (struct lwp_info
*lwp
);
275 static void proceed_all_lwps (void);
276 static int finish_step_over (struct lwp_info
*lwp
);
277 static int kill_lwp (unsigned long lwpid
, int signo
);
278 static void enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
);
279 static void complete_ongoing_step_over (void);
280 static int linux_low_ptrace_options (int attached
);
281 static int check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
);
282 static int proceed_one_lwp (thread_info
*thread
, void *except
);
284 /* When the event-loop is doing a step-over, this points at the thread
286 ptid_t step_over_bkpt
;
288 /* True if the low target can hardware single-step. */
291 can_hardware_single_step (void)
293 if (the_low_target
.supports_hardware_single_step
!= NULL
)
294 return the_low_target
.supports_hardware_single_step ();
299 /* True if the low target can software single-step. Such targets
300 implement the GET_NEXT_PCS callback. */
303 can_software_single_step (void)
305 return (the_low_target
.get_next_pcs
!= NULL
);
308 /* True if the low target supports memory breakpoints. If so, we'll
309 have a GET_PC implementation. */
312 supports_breakpoints (void)
314 return (the_low_target
.get_pc
!= NULL
);
317 /* Returns true if this target can support fast tracepoints. This
318 does not mean that the in-process agent has been loaded in the
322 supports_fast_tracepoints (void)
324 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
327 /* True if LWP is stopped in its stepping range. */
330 lwp_in_step_range (struct lwp_info
*lwp
)
332 CORE_ADDR pc
= lwp
->stop_pc
;
334 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
337 struct pending_signals
341 struct pending_signals
*prev
;
344 /* The read/write ends of the pipe registered as waitable file in the
346 static int linux_event_pipe
[2] = { -1, -1 };
348 /* True if we're currently in async mode. */
349 #define target_is_async_p() (linux_event_pipe[0] != -1)
351 static void send_sigstop (struct lwp_info
*lwp
);
352 static void wait_for_sigstop (void);
354 /* Return non-zero if HEADER is a 64-bit ELF file. */
357 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
359 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
360 && header
->e_ident
[EI_MAG1
] == ELFMAG1
361 && header
->e_ident
[EI_MAG2
] == ELFMAG2
362 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
364 *machine
= header
->e_machine
;
365 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
372 /* Return non-zero if FILE is a 64-bit ELF file,
373 zero if the file is not a 64-bit ELF file,
374 and -1 if the file is not accessible or doesn't exist. */
377 elf_64_file_p (const char *file
, unsigned int *machine
)
382 fd
= open (file
, O_RDONLY
);
386 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
393 return elf_64_header_p (&header
, machine
);
396 /* Accepts an integer PID; Returns true if the executable PID is
397 running is a 64-bit ELF file.. */
400 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
404 sprintf (file
, "/proc/%d/exe", pid
);
405 return elf_64_file_p (file
, machine
);
409 delete_lwp (struct lwp_info
*lwp
)
411 struct thread_info
*thr
= get_lwp_thread (lwp
);
414 debug_printf ("deleting %ld\n", lwpid_of (thr
));
418 if (the_low_target
.delete_thread
!= NULL
)
419 the_low_target
.delete_thread (lwp
->arch_private
);
421 gdb_assert (lwp
->arch_private
== NULL
);
426 /* Add a process to the common process list, and set its private
429 static struct process_info
*
430 linux_add_process (int pid
, int attached
)
432 struct process_info
*proc
;
434 proc
= add_process (pid
, attached
);
435 proc
->priv
= XCNEW (struct process_info_private
);
437 if (the_low_target
.new_process
!= NULL
)
438 proc
->priv
->arch_private
= the_low_target
.new_process ();
443 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
445 /* Call the target arch_setup function on the current thread. */
448 linux_arch_setup (void)
450 the_low_target
.arch_setup ();
453 /* Call the target arch_setup function on THREAD. */
456 linux_arch_setup_thread (struct thread_info
*thread
)
458 struct thread_info
*saved_thread
;
460 saved_thread
= current_thread
;
461 current_thread
= thread
;
465 current_thread
= saved_thread
;
468 /* Handle a GNU/Linux extended wait response. If we see a clone,
469 fork, or vfork event, we need to add the new LWP to our list
470 (and return 0 so as not to report the trap to higher layers).
471 If we see an exec event, we will modify ORIG_EVENT_LWP to point
472 to a new LWP representing the new program. */
475 handle_extended_wait (struct lwp_info
**orig_event_lwp
, int wstat
)
477 struct lwp_info
*event_lwp
= *orig_event_lwp
;
478 int event
= linux_ptrace_get_extended_event (wstat
);
479 struct thread_info
*event_thr
= get_lwp_thread (event_lwp
);
480 struct lwp_info
*new_lwp
;
482 gdb_assert (event_lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
484 /* All extended events we currently use are mid-syscall. Only
485 PTRACE_EVENT_STOP is delivered more like a signal-stop, but
486 you have to be using PTRACE_SEIZE to get that. */
487 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
489 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
490 || (event
== PTRACE_EVENT_CLONE
))
493 unsigned long new_pid
;
496 /* Get the pid of the new lwp. */
497 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
500 /* If we haven't already seen the new PID stop, wait for it now. */
501 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
503 /* The new child has a pending SIGSTOP. We can't affect it until it
504 hits the SIGSTOP, but we're already attached. */
506 ret
= my_waitpid (new_pid
, &status
, __WALL
);
509 perror_with_name ("waiting for new child");
510 else if (ret
!= new_pid
)
511 warning ("wait returned unexpected PID %d", ret
);
512 else if (!WIFSTOPPED (status
))
513 warning ("wait returned unexpected status 0x%x", status
);
516 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
518 struct process_info
*parent_proc
;
519 struct process_info
*child_proc
;
520 struct lwp_info
*child_lwp
;
521 struct thread_info
*child_thr
;
522 struct target_desc
*tdesc
;
524 ptid
= ptid_build (new_pid
, new_pid
, 0);
528 debug_printf ("HEW: Got fork event from LWP %ld, "
530 ptid_get_lwp (ptid_of (event_thr
)),
531 ptid_get_pid (ptid
));
534 /* Add the new process to the tables and clone the breakpoint
535 lists of the parent. We need to do this even if the new process
536 will be detached, since we will need the process object and the
537 breakpoints to remove any breakpoints from memory when we
538 detach, and the client side will access registers. */
539 child_proc
= linux_add_process (new_pid
, 0);
540 gdb_assert (child_proc
!= NULL
);
541 child_lwp
= add_lwp (ptid
);
542 gdb_assert (child_lwp
!= NULL
);
543 child_lwp
->stopped
= 1;
544 child_lwp
->must_set_ptrace_flags
= 1;
545 child_lwp
->status_pending_p
= 0;
546 child_thr
= get_lwp_thread (child_lwp
);
547 child_thr
->last_resume_kind
= resume_stop
;
548 child_thr
->last_status
.kind
= TARGET_WAITKIND_STOPPED
;
550 /* If we're suspending all threads, leave this one suspended
551 too. If the fork/clone parent is stepping over a breakpoint,
552 all other threads have been suspended already. Leave the
553 child suspended too. */
554 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
555 || event_lwp
->bp_reinsert
!= 0)
558 debug_printf ("HEW: leaving child suspended\n");
559 child_lwp
->suspended
= 1;
562 parent_proc
= get_thread_process (event_thr
);
563 child_proc
->attached
= parent_proc
->attached
;
565 if (event_lwp
->bp_reinsert
!= 0
566 && can_software_single_step ()
567 && event
== PTRACE_EVENT_VFORK
)
569 /* If we leave single-step breakpoints there, child will
570 hit it, so uninsert single-step breakpoints from parent
571 (and child). Once vfork child is done, reinsert
572 them back to parent. */
573 uninsert_single_step_breakpoints (event_thr
);
576 clone_all_breakpoints (child_thr
, event_thr
);
578 tdesc
= allocate_target_description ();
579 copy_target_description (tdesc
, parent_proc
->tdesc
);
580 child_proc
->tdesc
= tdesc
;
582 /* Clone arch-specific process data. */
583 if (the_low_target
.new_fork
!= NULL
)
584 the_low_target
.new_fork (parent_proc
, child_proc
);
586 /* Save fork info in the parent thread. */
587 if (event
== PTRACE_EVENT_FORK
)
588 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
589 else if (event
== PTRACE_EVENT_VFORK
)
590 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
592 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
594 /* The status_pending field contains bits denoting the
595 extended event, so when the pending event is handled,
596 the handler will look at lwp->waitstatus. */
597 event_lwp
->status_pending_p
= 1;
598 event_lwp
->status_pending
= wstat
;
600 /* Link the threads until the parent event is passed on to
602 event_lwp
->fork_relative
= child_lwp
;
603 child_lwp
->fork_relative
= event_lwp
;
605 /* If the parent thread is doing step-over with single-step
606 breakpoints, the list of single-step breakpoints are cloned
607 from the parent's. Remove them from the child process.
608 In case of vfork, we'll reinsert them back once vforked
610 if (event_lwp
->bp_reinsert
!= 0
611 && can_software_single_step ())
613 /* The child process is forked and stopped, so it is safe
614 to access its memory without stopping all other threads
615 from other processes. */
616 delete_single_step_breakpoints (child_thr
);
618 gdb_assert (has_single_step_breakpoints (event_thr
));
619 gdb_assert (!has_single_step_breakpoints (child_thr
));
622 /* Report the event. */
627 debug_printf ("HEW: Got clone event "
628 "from LWP %ld, new child is LWP %ld\n",
629 lwpid_of (event_thr
), new_pid
);
631 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
632 new_lwp
= add_lwp (ptid
);
634 /* Either we're going to immediately resume the new thread
635 or leave it stopped. linux_resume_one_lwp is a nop if it
636 thinks the thread is currently running, so set this first
637 before calling linux_resume_one_lwp. */
638 new_lwp
->stopped
= 1;
640 /* If we're suspending all threads, leave this one suspended
641 too. If the fork/clone parent is stepping over a breakpoint,
642 all other threads have been suspended already. Leave the
643 child suspended too. */
644 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
645 || event_lwp
->bp_reinsert
!= 0)
646 new_lwp
->suspended
= 1;
648 /* Normally we will get the pending SIGSTOP. But in some cases
649 we might get another signal delivered to the group first.
650 If we do get another signal, be sure not to lose it. */
651 if (WSTOPSIG (status
) != SIGSTOP
)
653 new_lwp
->stop_expected
= 1;
654 new_lwp
->status_pending_p
= 1;
655 new_lwp
->status_pending
= status
;
657 else if (report_thread_events
)
659 new_lwp
->waitstatus
.kind
= TARGET_WAITKIND_THREAD_CREATED
;
660 new_lwp
->status_pending_p
= 1;
661 new_lwp
->status_pending
= status
;
664 thread_db_notice_clone (event_thr
, ptid
);
666 /* Don't report the event. */
669 else if (event
== PTRACE_EVENT_VFORK_DONE
)
671 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
673 if (event_lwp
->bp_reinsert
!= 0 && can_software_single_step ())
675 reinsert_single_step_breakpoints (event_thr
);
677 gdb_assert (has_single_step_breakpoints (event_thr
));
680 /* Report the event. */
683 else if (event
== PTRACE_EVENT_EXEC
&& report_exec_events
)
685 struct process_info
*proc
;
686 std::vector
<int> syscalls_to_catch
;
692 debug_printf ("HEW: Got exec event from LWP %ld\n",
693 lwpid_of (event_thr
));
696 /* Get the event ptid. */
697 event_ptid
= ptid_of (event_thr
);
698 event_pid
= ptid_get_pid (event_ptid
);
700 /* Save the syscall list from the execing process. */
701 proc
= get_thread_process (event_thr
);
702 syscalls_to_catch
= std::move (proc
->syscalls_to_catch
);
704 /* Delete the execing process and all its threads. */
706 current_thread
= NULL
;
708 /* Create a new process/lwp/thread. */
709 proc
= linux_add_process (event_pid
, 0);
710 event_lwp
= add_lwp (event_ptid
);
711 event_thr
= get_lwp_thread (event_lwp
);
712 gdb_assert (current_thread
== event_thr
);
713 linux_arch_setup_thread (event_thr
);
715 /* Set the event status. */
716 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
717 event_lwp
->waitstatus
.value
.execd_pathname
718 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
720 /* Mark the exec status as pending. */
721 event_lwp
->stopped
= 1;
722 event_lwp
->status_pending_p
= 1;
723 event_lwp
->status_pending
= wstat
;
724 event_thr
->last_resume_kind
= resume_continue
;
725 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
727 /* Update syscall state in the new lwp, effectively mid-syscall too. */
728 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
730 /* Restore the list to catch. Don't rely on the client, which is free
731 to avoid sending a new list when the architecture doesn't change.
732 Also, for ANY_SYSCALL, the architecture doesn't really matter. */
733 proc
->syscalls_to_catch
= std::move (syscalls_to_catch
);
735 /* Report the event. */
736 *orig_event_lwp
= event_lwp
;
740 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
743 /* Return the PC as read from the regcache of LWP, without any
747 get_pc (struct lwp_info
*lwp
)
749 struct thread_info
*saved_thread
;
750 struct regcache
*regcache
;
753 if (the_low_target
.get_pc
== NULL
)
756 saved_thread
= current_thread
;
757 current_thread
= get_lwp_thread (lwp
);
759 regcache
= get_thread_regcache (current_thread
, 1);
760 pc
= (*the_low_target
.get_pc
) (regcache
);
763 debug_printf ("pc is 0x%lx\n", (long) pc
);
765 current_thread
= saved_thread
;
769 /* This function should only be called if LWP got a SYSCALL_SIGTRAP.
770 Fill *SYSNO with the syscall nr trapped. */
773 get_syscall_trapinfo (struct lwp_info
*lwp
, int *sysno
)
775 struct thread_info
*saved_thread
;
776 struct regcache
*regcache
;
778 if (the_low_target
.get_syscall_trapinfo
== NULL
)
780 /* If we cannot get the syscall trapinfo, report an unknown
781 system call number. */
782 *sysno
= UNKNOWN_SYSCALL
;
786 saved_thread
= current_thread
;
787 current_thread
= get_lwp_thread (lwp
);
789 regcache
= get_thread_regcache (current_thread
, 1);
790 (*the_low_target
.get_syscall_trapinfo
) (regcache
, sysno
);
793 debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno
);
795 current_thread
= saved_thread
;
798 static int check_stopped_by_watchpoint (struct lwp_info
*child
);
800 /* Called when the LWP stopped for a signal/trap. If it stopped for a
801 trap check what caused it (breakpoint, watchpoint, trace, etc.),
802 and save the result in the LWP's stop_reason field. If it stopped
803 for a breakpoint, decrement the PC if necessary on the lwp's
804 architecture. Returns true if we now have the LWP's stop PC. */
807 save_stop_reason (struct lwp_info
*lwp
)
810 CORE_ADDR sw_breakpoint_pc
;
811 struct thread_info
*saved_thread
;
812 #if USE_SIGTRAP_SIGINFO
816 if (the_low_target
.get_pc
== NULL
)
820 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
822 /* breakpoint_at reads from the current thread. */
823 saved_thread
= current_thread
;
824 current_thread
= get_lwp_thread (lwp
);
826 #if USE_SIGTRAP_SIGINFO
827 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
828 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
830 if (siginfo
.si_signo
== SIGTRAP
)
832 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
)
833 && GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
835 /* The si_code is ambiguous on this arch -- check debug
837 if (!check_stopped_by_watchpoint (lwp
))
838 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
840 else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
842 /* If we determine the LWP stopped for a SW breakpoint,
843 trust it. Particularly don't check watchpoint
844 registers, because at least on s390, we'd find
845 stopped-by-watchpoint as long as there's a watchpoint
847 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
849 else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
851 /* This can indicate either a hardware breakpoint or
852 hardware watchpoint. Check debug registers. */
853 if (!check_stopped_by_watchpoint (lwp
))
854 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
856 else if (siginfo
.si_code
== TRAP_TRACE
)
858 /* We may have single stepped an instruction that
859 triggered a watchpoint. In that case, on some
860 architectures (such as x86), instead of TRAP_HWBKPT,
861 si_code indicates TRAP_TRACE, and we need to check
862 the debug registers separately. */
863 if (!check_stopped_by_watchpoint (lwp
))
864 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
869 /* We may have just stepped a breakpoint instruction. E.g., in
870 non-stop mode, GDB first tells the thread A to step a range, and
871 then the user inserts a breakpoint inside the range. In that
872 case we need to report the breakpoint PC. */
873 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
874 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
875 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
877 if (hardware_breakpoint_inserted_here (pc
))
878 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
880 if (lwp
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
)
881 check_stopped_by_watchpoint (lwp
);
884 if (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
888 struct thread_info
*thr
= get_lwp_thread (lwp
);
890 debug_printf ("CSBB: %s stopped by software breakpoint\n",
891 target_pid_to_str (ptid_of (thr
)));
894 /* Back up the PC if necessary. */
895 if (pc
!= sw_breakpoint_pc
)
897 struct regcache
*regcache
898 = get_thread_regcache (current_thread
, 1);
899 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
902 /* Update this so we record the correct stop PC below. */
903 pc
= sw_breakpoint_pc
;
905 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
)
909 struct thread_info
*thr
= get_lwp_thread (lwp
);
911 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
912 target_pid_to_str (ptid_of (thr
)));
915 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
919 struct thread_info
*thr
= get_lwp_thread (lwp
);
921 debug_printf ("CSBB: %s stopped by hardware watchpoint\n",
922 target_pid_to_str (ptid_of (thr
)));
925 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
)
929 struct thread_info
*thr
= get_lwp_thread (lwp
);
931 debug_printf ("CSBB: %s stopped by trace\n",
932 target_pid_to_str (ptid_of (thr
)));
937 current_thread
= saved_thread
;
941 static struct lwp_info
*
942 add_lwp (ptid_t ptid
)
944 struct lwp_info
*lwp
;
946 lwp
= XCNEW (struct lwp_info
);
948 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
950 if (the_low_target
.new_thread
!= NULL
)
951 the_low_target
.new_thread (lwp
);
953 lwp
->thread
= add_thread (ptid
, lwp
);
958 /* Callback to be used when calling fork_inferior, responsible for
959 actually initiating the tracing of the inferior. */
964 if (ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0,
965 (PTRACE_TYPE_ARG4
) 0) < 0)
966 trace_start_error_with_name ("ptrace");
968 if (setpgid (0, 0) < 0)
969 trace_start_error_with_name ("setpgid");
971 /* If GDBserver is connected to gdb via stdio, redirect the inferior's
972 stdout to stderr so that inferior i/o doesn't corrupt the connection.
973 Also, redirect stdin to /dev/null. */
974 if (remote_connection_is_stdio ())
977 trace_start_error_with_name ("close");
978 if (open ("/dev/null", O_RDONLY
) < 0)
979 trace_start_error_with_name ("open");
981 trace_start_error_with_name ("dup2");
982 if (write (2, "stdin/stdout redirected\n",
983 sizeof ("stdin/stdout redirected\n") - 1) < 0)
985 /* Errors ignored. */;
990 /* Start an inferior process and returns its pid.
991 PROGRAM is the name of the program to be started, and PROGRAM_ARGS
992 are its arguments. */
995 linux_create_inferior (const char *program
,
996 const std::vector
<char *> &program_args
)
998 struct lwp_info
*new_lwp
;
1003 maybe_disable_address_space_randomization restore_personality
1004 (disable_randomization
);
1005 std::string str_program_args
= stringify_argv (program_args
);
1007 pid
= fork_inferior (program
,
1008 str_program_args
.c_str (),
1009 get_environ ()->envp (), linux_ptrace_fun
,
1010 NULL
, NULL
, NULL
, NULL
);
1013 linux_add_process (pid
, 0);
1015 ptid
= ptid_build (pid
, pid
, 0);
1016 new_lwp
= add_lwp (ptid
);
1017 new_lwp
->must_set_ptrace_flags
= 1;
1019 post_fork_inferior (pid
, program
);
1024 /* Implement the post_create_inferior target_ops method. */
1027 linux_post_create_inferior (void)
1029 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
1031 linux_arch_setup ();
1033 if (lwp
->must_set_ptrace_flags
)
1035 struct process_info
*proc
= current_process ();
1036 int options
= linux_low_ptrace_options (proc
->attached
);
1038 linux_enable_event_reporting (lwpid_of (current_thread
), options
);
1039 lwp
->must_set_ptrace_flags
= 0;
1043 /* Attach to an inferior process. Returns 0 on success, ERRNO on
1047 linux_attach_lwp (ptid_t ptid
)
1049 struct lwp_info
*new_lwp
;
1050 int lwpid
= ptid_get_lwp (ptid
);
1052 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
1056 new_lwp
= add_lwp (ptid
);
1058 /* We need to wait for SIGSTOP before being able to make the next
1059 ptrace call on this LWP. */
1060 new_lwp
->must_set_ptrace_flags
= 1;
1062 if (linux_proc_pid_is_stopped (lwpid
))
1065 debug_printf ("Attached to a stopped process\n");
1067 /* The process is definitely stopped. It is in a job control
1068 stop, unless the kernel predates the TASK_STOPPED /
1069 TASK_TRACED distinction, in which case it might be in a
1070 ptrace stop. Make sure it is in a ptrace stop; from there we
1071 can kill it, signal it, et cetera.
1073 First make sure there is a pending SIGSTOP. Since we are
1074 already attached, the process can not transition from stopped
1075 to running without a PTRACE_CONT; so we know this signal will
1076 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1077 probably already in the queue (unless this kernel is old
1078 enough to use TASK_STOPPED for ptrace stops); but since
1079 SIGSTOP is not an RT signal, it can only be queued once. */
1080 kill_lwp (lwpid
, SIGSTOP
);
1082 /* Finally, resume the stopped process. This will deliver the
1083 SIGSTOP (or a higher priority signal, just like normal
1084 PTRACE_ATTACH), which we'll catch later on. */
1085 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1088 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
1089 brings it to a halt.
1091 There are several cases to consider here:
1093 1) gdbserver has already attached to the process and is being notified
1094 of a new thread that is being created.
1095 In this case we should ignore that SIGSTOP and resume the
1096 process. This is handled below by setting stop_expected = 1,
1097 and the fact that add_thread sets last_resume_kind ==
1100 2) This is the first thread (the process thread), and we're attaching
1101 to it via attach_inferior.
1102 In this case we want the process thread to stop.
1103 This is handled by having linux_attach set last_resume_kind ==
1104 resume_stop after we return.
1106 If the pid we are attaching to is also the tgid, we attach to and
1107 stop all the existing threads. Otherwise, we attach to pid and
1108 ignore any other threads in the same group as this pid.
1110 3) GDB is connecting to gdbserver and is requesting an enumeration of all
1112 In this case we want the thread to stop.
1113 FIXME: This case is currently not properly handled.
1114 We should wait for the SIGSTOP but don't. Things work apparently
1115 because enough time passes between when we ptrace (ATTACH) and when
1116 gdb makes the next ptrace call on the thread.
1118 On the other hand, if we are currently trying to stop all threads, we
1119 should treat the new thread as if we had sent it a SIGSTOP. This works
1120 because we are guaranteed that the add_lwp call above added us to the
1121 end of the list, and so the new thread has not yet reached
1122 wait_for_sigstop (but will). */
1123 new_lwp
->stop_expected
= 1;
1128 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
1129 already attached. Returns true if a new LWP is found, false
1133 attach_proc_task_lwp_callback (ptid_t ptid
)
1135 /* Is this a new thread? */
1136 if (find_thread_ptid (ptid
) == NULL
)
1138 int lwpid
= ptid_get_lwp (ptid
);
1142 debug_printf ("Found new lwp %d\n", lwpid
);
1144 err
= linux_attach_lwp (ptid
);
1146 /* Be quiet if we simply raced with the thread exiting. EPERM
1147 is returned if the thread's task still exists, and is marked
1148 as exited or zombie, as well as other conditions, so in that
1149 case, confirm the status in /proc/PID/status. */
1151 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1155 debug_printf ("Cannot attach to lwp %d: "
1156 "thread is gone (%d: %s)\n",
1157 lwpid
, err
, strerror (err
));
1162 warning (_("Cannot attach to lwp %d: %s"),
1164 linux_ptrace_attach_fail_reason_string (ptid
, err
));
1172 static void async_file_mark (void);
1174 /* Attach to PID. If PID is the tgid, attach to it and all
1178 linux_attach (unsigned long pid
)
1180 struct process_info
*proc
;
1181 struct thread_info
*initial_thread
;
1182 ptid_t ptid
= ptid_build (pid
, pid
, 0);
1185 /* Attach to PID. We will check for other threads
1187 err
= linux_attach_lwp (ptid
);
1189 error ("Cannot attach to process %ld: %s",
1190 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
1192 proc
= linux_add_process (pid
, 1);
1194 /* Don't ignore the initial SIGSTOP if we just attached to this
1195 process. It will be collected by wait shortly. */
1196 initial_thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
1197 initial_thread
->last_resume_kind
= resume_stop
;
1199 /* We must attach to every LWP. If /proc is mounted, use that to
1200 find them now. On the one hand, the inferior may be using raw
1201 clone instead of using pthreads. On the other hand, even if it
1202 is using pthreads, GDB may not be connected yet (thread_db needs
1203 to do symbol lookups, through qSymbol). Also, thread_db walks
1204 structures in the inferior's address space to find the list of
1205 threads/LWPs, and those structures may well be corrupted. Note
1206 that once thread_db is loaded, we'll still use it to list threads
1207 and associate pthread info with each LWP. */
1208 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1210 /* GDB will shortly read the xml target description for this
1211 process, to figure out the process' architecture. But the target
1212 description is only filled in when the first process/thread in
1213 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1214 that now, otherwise, if GDB is fast enough, it could read the
1215 target description _before_ that initial stop. */
1218 struct lwp_info
*lwp
;
1220 ptid_t pid_ptid
= pid_to_ptid (pid
);
1222 lwpid
= linux_wait_for_event_filtered (pid_ptid
, pid_ptid
,
1224 gdb_assert (lwpid
> 0);
1226 lwp
= find_lwp_pid (pid_to_ptid (lwpid
));
1228 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGSTOP
)
1230 lwp
->status_pending_p
= 1;
1231 lwp
->status_pending
= wstat
;
1234 initial_thread
->last_resume_kind
= resume_continue
;
1238 gdb_assert (proc
->tdesc
!= NULL
);
1245 last_thread_of_process_p (int pid
)
1247 bool seen_one
= false;
1249 thread_info
*thread
= find_thread (pid
, [&] (thread_info
*thread
)
1253 /* This is the first thread of this process we see. */
1259 /* This is the second thread of this process we see. */
1264 return thread
== NULL
;
1270 linux_kill_one_lwp (struct lwp_info
*lwp
)
1272 struct thread_info
*thr
= get_lwp_thread (lwp
);
1273 int pid
= lwpid_of (thr
);
1275 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1276 there is no signal context, and ptrace(PTRACE_KILL) (or
1277 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1278 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1279 alternative is to kill with SIGKILL. We only need one SIGKILL
1280 per process, not one for each thread. But since we still support
1281 support debugging programs using raw clone without CLONE_THREAD,
1282 we send one for each thread. For years, we used PTRACE_KILL
1283 only, so we're being a bit paranoid about some old kernels where
1284 PTRACE_KILL might work better (dubious if there are any such, but
1285 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1286 second, and so we're fine everywhere. */
1289 kill_lwp (pid
, SIGKILL
);
1292 int save_errno
= errno
;
1294 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1295 target_pid_to_str (ptid_of (thr
)),
1296 save_errno
? strerror (save_errno
) : "OK");
1300 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1303 int save_errno
= errno
;
1305 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1306 target_pid_to_str (ptid_of (thr
)),
1307 save_errno
? strerror (save_errno
) : "OK");
1311 /* Kill LWP and wait for it to die. */
1314 kill_wait_lwp (struct lwp_info
*lwp
)
1316 struct thread_info
*thr
= get_lwp_thread (lwp
);
1317 int pid
= ptid_get_pid (ptid_of (thr
));
1318 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1323 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1327 linux_kill_one_lwp (lwp
);
1329 /* Make sure it died. Notes:
1331 - The loop is most likely unnecessary.
1333 - We don't use linux_wait_for_event as that could delete lwps
1334 while we're iterating over them. We're not interested in
1335 any pending status at this point, only in making sure all
1336 wait status on the kernel side are collected until the
1339 - We don't use __WALL here as the __WALL emulation relies on
1340 SIGCHLD, and killing a stopped process doesn't generate
1341 one, nor an exit status.
1343 res
= my_waitpid (lwpid
, &wstat
, 0);
1344 if (res
== -1 && errno
== ECHILD
)
1345 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1346 } while (res
> 0 && WIFSTOPPED (wstat
));
1348 /* Even if it was stopped, the child may have already disappeared.
1349 E.g., if it was killed by SIGKILL. */
1350 if (res
< 0 && errno
!= ECHILD
)
1351 perror_with_name ("kill_wait_lwp");
1354 /* Callback for `for_each_thread'. Kills an lwp of a given process,
1355 except the leader. */
1358 kill_one_lwp_callback (thread_info
*thread
, int pid
)
1360 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1362 /* We avoid killing the first thread here, because of a Linux kernel (at
1363 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1364 the children get a chance to be reaped, it will remain a zombie
1367 if (lwpid_of (thread
) == pid
)
1370 debug_printf ("lkop: is last of process %s\n",
1371 target_pid_to_str (thread
->id
));
1375 kill_wait_lwp (lwp
);
1379 linux_kill (int pid
)
1381 struct process_info
*process
;
1382 struct lwp_info
*lwp
;
1384 process
= find_process_pid (pid
);
1385 if (process
== NULL
)
1388 /* If we're killing a running inferior, make sure it is stopped
1389 first, as PTRACE_KILL will not work otherwise. */
1390 stop_all_lwps (0, NULL
);
1392 for_each_thread (pid
, [&] (thread_info
*thread
)
1394 kill_one_lwp_callback (thread
, pid
);
1397 /* See the comment in linux_kill_one_lwp. We did not kill the first
1398 thread in the list, so do so now. */
1399 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1404 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1408 kill_wait_lwp (lwp
);
1410 the_target
->mourn (process
);
1412 /* Since we presently can only stop all lwps of all processes, we
1413 need to unstop lwps of other processes. */
1414 unstop_all_lwps (0, NULL
);
1418 /* Get pending signal of THREAD, for detaching purposes. This is the
1419 signal the thread last stopped for, which we need to deliver to the
1420 thread when detaching, otherwise, it'd be suppressed/lost. */
1423 get_detach_signal (struct thread_info
*thread
)
1425 enum gdb_signal signo
= GDB_SIGNAL_0
;
1427 struct lwp_info
*lp
= get_thread_lwp (thread
);
1429 if (lp
->status_pending_p
)
1430 status
= lp
->status_pending
;
1433 /* If the thread had been suspended by gdbserver, and it stopped
1434 cleanly, then it'll have stopped with SIGSTOP. But we don't
1435 want to deliver that SIGSTOP. */
1436 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1437 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1440 /* Otherwise, we may need to deliver the signal we
1442 status
= lp
->last_status
;
1445 if (!WIFSTOPPED (status
))
1448 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1449 target_pid_to_str (ptid_of (thread
)));
1453 /* Extended wait statuses aren't real SIGTRAPs. */
1454 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1457 debug_printf ("GPS: lwp %s had stopped with extended "
1458 "status: no pending signal\n",
1459 target_pid_to_str (ptid_of (thread
)));
1463 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1465 if (program_signals_p
&& !program_signals
[signo
])
1468 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1469 target_pid_to_str (ptid_of (thread
)),
1470 gdb_signal_to_string (signo
));
1473 else if (!program_signals_p
1474 /* If we have no way to know which signals GDB does not
1475 want to have passed to the program, assume
1476 SIGTRAP/SIGINT, which is GDB's default. */
1477 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1480 debug_printf ("GPS: lwp %s had signal %s, "
1481 "but we don't know if we should pass it. "
1482 "Default to not.\n",
1483 target_pid_to_str (ptid_of (thread
)),
1484 gdb_signal_to_string (signo
));
1490 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1491 target_pid_to_str (ptid_of (thread
)),
1492 gdb_signal_to_string (signo
));
1494 return WSTOPSIG (status
);
1498 /* Detach from LWP. */
1501 linux_detach_one_lwp (struct lwp_info
*lwp
)
1503 struct thread_info
*thread
= get_lwp_thread (lwp
);
1507 /* If there is a pending SIGSTOP, get rid of it. */
1508 if (lwp
->stop_expected
)
1511 debug_printf ("Sending SIGCONT to %s\n",
1512 target_pid_to_str (ptid_of (thread
)));
1514 kill_lwp (lwpid_of (thread
), SIGCONT
);
1515 lwp
->stop_expected
= 0;
1518 /* Pass on any pending signal for this thread. */
1519 sig
= get_detach_signal (thread
);
1521 /* Preparing to resume may try to write registers, and fail if the
1522 lwp is zombie. If that happens, ignore the error. We'll handle
1523 it below, when detach fails with ESRCH. */
1526 /* Flush any pending changes to the process's registers. */
1527 regcache_invalidate_thread (thread
);
1529 /* Finally, let it resume. */
1530 if (the_low_target
.prepare_to_resume
!= NULL
)
1531 the_low_target
.prepare_to_resume (lwp
);
1533 CATCH (ex
, RETURN_MASK_ERROR
)
1535 if (!check_ptrace_stopped_lwp_gone (lwp
))
1536 throw_exception (ex
);
1540 lwpid
= lwpid_of (thread
);
1541 if (ptrace (PTRACE_DETACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0,
1542 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1544 int save_errno
= errno
;
1546 /* We know the thread exists, so ESRCH must mean the lwp is
1547 zombie. This can happen if one of the already-detached
1548 threads exits the whole thread group. In that case we're
1549 still attached, and must reap the lwp. */
1550 if (save_errno
== ESRCH
)
1554 ret
= my_waitpid (lwpid
, &status
, __WALL
);
1557 warning (_("Couldn't reap LWP %d while detaching: %s"),
1558 lwpid
, strerror (errno
));
1560 else if (!WIFEXITED (status
) && !WIFSIGNALED (status
))
1562 warning (_("Reaping LWP %d while detaching "
1563 "returned unexpected status 0x%x"),
1569 error (_("Can't detach %s: %s"),
1570 target_pid_to_str (ptid_of (thread
)),
1571 strerror (save_errno
));
1574 else if (debug_threads
)
1576 debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n",
1577 target_pid_to_str (ptid_of (thread
)),
1584 /* Callback for for_each_thread. Detaches from non-leader threads of a
1588 linux_detach_lwp_callback (thread_info
*thread
)
1590 /* We don't actually detach from the thread group leader just yet.
1591 If the thread group exits, we must reap the zombie clone lwps
1592 before we're able to reap the leader. */
1593 if (thread
->id
.pid () == thread
->id
.lwp ())
1596 lwp_info
*lwp
= get_thread_lwp (thread
);
1597 linux_detach_one_lwp (lwp
);
1601 linux_detach (int pid
)
1603 struct process_info
*process
;
1604 struct lwp_info
*main_lwp
;
1606 process
= find_process_pid (pid
);
1607 if (process
== NULL
)
1610 /* As there's a step over already in progress, let it finish first,
1611 otherwise nesting a stabilize_threads operation on top gets real
1613 complete_ongoing_step_over ();
1615 /* Stop all threads before detaching. First, ptrace requires that
1616 the thread is stopped to sucessfully detach. Second, thread_db
1617 may need to uninstall thread event breakpoints from memory, which
1618 only works with a stopped process anyway. */
1619 stop_all_lwps (0, NULL
);
1621 #ifdef USE_THREAD_DB
1622 thread_db_detach (process
);
1625 /* Stabilize threads (move out of jump pads). */
1626 stabilize_threads ();
1628 /* Detach from the clone lwps first. If the thread group exits just
1629 while we're detaching, we must reap the clone lwps before we're
1630 able to reap the leader. */
1631 for_each_thread (pid
, linux_detach_lwp_callback
);
1633 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1634 linux_detach_one_lwp (main_lwp
);
1636 the_target
->mourn (process
);
1638 /* Since we presently can only stop all lwps of all processes, we
1639 need to unstop lwps of other processes. */
1640 unstop_all_lwps (0, NULL
);
1644 /* Remove all LWPs that belong to process PROC from the lwp list. */
1647 linux_mourn (struct process_info
*process
)
1649 struct process_info_private
*priv
;
1651 #ifdef USE_THREAD_DB
1652 thread_db_mourn (process
);
1655 for_each_thread (process
->pid
, [] (thread_info
*thread
)
1657 delete_lwp (get_thread_lwp (thread
));
1660 /* Freeing all private data. */
1661 priv
= process
->priv
;
1662 if (the_low_target
.delete_process
!= NULL
)
1663 the_low_target
.delete_process (priv
->arch_private
);
1665 gdb_assert (priv
->arch_private
== NULL
);
1667 process
->priv
= NULL
;
1669 remove_process (process
);
1673 linux_join (int pid
)
1678 ret
= my_waitpid (pid
, &status
, 0);
1679 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1681 } while (ret
!= -1 || errno
!= ECHILD
);
1684 /* Return nonzero if the given thread is still alive. */
1686 linux_thread_alive (ptid_t ptid
)
1688 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1690 /* We assume we always know if a thread exits. If a whole process
1691 exited but we still haven't been able to report it to GDB, we'll
1692 hold on to the last lwp of the dead process. */
1694 return !lwp_is_marked_dead (lwp
);
1699 /* Return 1 if this lwp still has an interesting status pending. If
1700 not (e.g., it had stopped for a breakpoint that is gone), return
1704 thread_still_has_status_pending_p (struct thread_info
*thread
)
1706 struct lwp_info
*lp
= get_thread_lwp (thread
);
1708 if (!lp
->status_pending_p
)
1711 if (thread
->last_resume_kind
!= resume_stop
1712 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1713 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1715 struct thread_info
*saved_thread
;
1719 gdb_assert (lp
->last_status
!= 0);
1723 saved_thread
= current_thread
;
1724 current_thread
= thread
;
1726 if (pc
!= lp
->stop_pc
)
1729 debug_printf ("PC of %ld changed\n",
1734 #if !USE_SIGTRAP_SIGINFO
1735 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1736 && !(*the_low_target
.breakpoint_at
) (pc
))
1739 debug_printf ("previous SW breakpoint of %ld gone\n",
1743 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1744 && !hardware_breakpoint_inserted_here (pc
))
1747 debug_printf ("previous HW breakpoint of %ld gone\n",
1753 current_thread
= saved_thread
;
1758 debug_printf ("discarding pending breakpoint status\n");
1759 lp
->status_pending_p
= 0;
1767 /* Returns true if LWP is resumed from the client's perspective. */
1770 lwp_resumed (struct lwp_info
*lwp
)
1772 struct thread_info
*thread
= get_lwp_thread (lwp
);
1774 if (thread
->last_resume_kind
!= resume_stop
)
1777 /* Did gdb send us a `vCont;t', but we haven't reported the
1778 corresponding stop to gdb yet? If so, the thread is still
1779 resumed/running from gdb's perspective. */
1780 if (thread
->last_resume_kind
== resume_stop
1781 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1787 /* Return true if this lwp has an interesting status pending. */
1789 status_pending_p_callback (thread_info
*thread
, ptid_t ptid
)
1791 struct lwp_info
*lp
= get_thread_lwp (thread
);
1793 /* Check if we're only interested in events from a specific process
1794 or a specific LWP. */
1795 if (!thread
->id
.matches (ptid
))
1798 if (!lwp_resumed (lp
))
1801 if (lp
->status_pending_p
1802 && !thread_still_has_status_pending_p (thread
))
1804 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1808 return lp
->status_pending_p
;
1812 find_lwp_pid (ptid_t ptid
)
1814 thread_info
*thread
= find_thread ([&] (thread_info
*thread
)
1816 int lwp
= ptid
.lwp () != 0 ? ptid
.lwp () : ptid
.pid ();
1817 return thread
->id
.lwp () == lwp
;
1823 return get_thread_lwp (thread
);
1826 /* Return the number of known LWPs in the tgid given by PID. */
1833 for_each_thread (pid
, [&] (thread_info
*thread
)
1841 /* See nat/linux-nat.h. */
1844 iterate_over_lwps (ptid_t filter
,
1845 iterate_over_lwps_ftype callback
,
1848 thread_info
*thread
= find_thread (filter
, [&] (thread_info
*thread
)
1850 lwp_info
*lwp
= get_thread_lwp (thread
);
1852 return callback (lwp
, data
);
1858 return get_thread_lwp (thread
);
1861 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1862 their exits until all other threads in the group have exited. */
1865 check_zombie_leaders (void)
1867 for_each_process ([] (process_info
*proc
) {
1868 pid_t leader_pid
= pid_of (proc
);
1869 struct lwp_info
*leader_lp
;
1871 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1874 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1875 "num_lwps=%d, zombie=%d\n",
1876 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1877 linux_proc_pid_is_zombie (leader_pid
));
1879 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1880 /* Check if there are other threads in the group, as we may
1881 have raced with the inferior simply exiting. */
1882 && !last_thread_of_process_p (leader_pid
)
1883 && linux_proc_pid_is_zombie (leader_pid
))
1885 /* A leader zombie can mean one of two things:
1887 - It exited, and there's an exit status pending
1888 available, or only the leader exited (not the whole
1889 program). In the latter case, we can't waitpid the
1890 leader's exit status until all other threads are gone.
1892 - There are 3 or more threads in the group, and a thread
1893 other than the leader exec'd. On an exec, the Linux
1894 kernel destroys all other threads (except the execing
1895 one) in the thread group, and resets the execing thread's
1896 tid to the tgid. No exit notification is sent for the
1897 execing thread -- from the ptracer's perspective, it
1898 appears as though the execing thread just vanishes.
1899 Until we reap all other threads except the leader and the
1900 execing thread, the leader will be zombie, and the
1901 execing thread will be in `D (disc sleep)'. As soon as
1902 all other threads are reaped, the execing thread changes
1903 it's tid to the tgid, and the previous (zombie) leader
1904 vanishes, giving place to the "new" leader. We could try
1905 distinguishing the exit and exec cases, by waiting once
1906 more, and seeing if something comes out, but it doesn't
1907 sound useful. The previous leader _does_ go away, and
1908 we'll re-add the new one once we see the exec event
1909 (which is just the same as what would happen if the
1910 previous leader did exit voluntarily before some other
1914 debug_printf ("CZL: Thread group leader %d zombie "
1915 "(it exited, or another thread execd).\n",
1918 delete_lwp (leader_lp
);
1923 /* Callback for `find_thread'. Returns the first LWP that is not
1927 not_stopped_callback (thread_info
*thread
, ptid_t filter
)
1929 if (!thread
->id
.matches (filter
))
1932 lwp_info
*lwp
= get_thread_lwp (thread
);
1934 return !lwp
->stopped
;
1937 /* Increment LWP's suspend count. */
1940 lwp_suspended_inc (struct lwp_info
*lwp
)
1944 if (debug_threads
&& lwp
->suspended
> 4)
1946 struct thread_info
*thread
= get_lwp_thread (lwp
);
1948 debug_printf ("LWP %ld has a suspiciously high suspend count,"
1949 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
1953 /* Decrement LWP's suspend count. */
1956 lwp_suspended_decr (struct lwp_info
*lwp
)
1960 if (lwp
->suspended
< 0)
1962 struct thread_info
*thread
= get_lwp_thread (lwp
);
1964 internal_error (__FILE__
, __LINE__
,
1965 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
1970 /* This function should only be called if the LWP got a SIGTRAP.
1972 Handle any tracepoint steps or hits. Return true if a tracepoint
1973 event was handled, 0 otherwise. */
1976 handle_tracepoints (struct lwp_info
*lwp
)
1978 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1979 int tpoint_related_event
= 0;
1981 gdb_assert (lwp
->suspended
== 0);
1983 /* If this tracepoint hit causes a tracing stop, we'll immediately
1984 uninsert tracepoints. To do this, we temporarily pause all
1985 threads, unpatch away, and then unpause threads. We need to make
1986 sure the unpausing doesn't resume LWP too. */
1987 lwp_suspended_inc (lwp
);
1989 /* And we need to be sure that any all-threads-stopping doesn't try
1990 to move threads out of the jump pads, as it could deadlock the
1991 inferior (LWP could be in the jump pad, maybe even holding the
1994 /* Do any necessary step collect actions. */
1995 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1997 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1999 /* See if we just hit a tracepoint and do its main collect
2001 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2003 lwp_suspended_decr (lwp
);
2005 gdb_assert (lwp
->suspended
== 0);
2006 gdb_assert (!stabilizing_threads
2007 || (lwp
->collecting_fast_tracepoint
2008 != fast_tpoint_collect_result::not_collecting
));
2010 if (tpoint_related_event
)
2013 debug_printf ("got a tracepoint event\n");
2020 /* Convenience wrapper. Returns information about LWP's fast tracepoint
2021 collection status. */
2023 static fast_tpoint_collect_result
2024 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2025 struct fast_tpoint_collect_status
*status
)
2027 CORE_ADDR thread_area
;
2028 struct thread_info
*thread
= get_lwp_thread (lwp
);
2030 if (the_low_target
.get_thread_area
== NULL
)
2031 return fast_tpoint_collect_result::not_collecting
;
2033 /* Get the thread area address. This is used to recognize which
2034 thread is which when tracing with the in-process agent library.
2035 We don't read anything from the address, and treat it as opaque;
2036 it's the address itself that we assume is unique per-thread. */
2037 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2038 return fast_tpoint_collect_result::not_collecting
;
2040 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2043 /* The reason we resume in the caller, is because we want to be able
2044 to pass lwp->status_pending as WSTAT, and we need to clear
2045 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2046 refuses to resume. */
2049 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2051 struct thread_info
*saved_thread
;
2053 saved_thread
= current_thread
;
2054 current_thread
= get_lwp_thread (lwp
);
2057 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2058 && supports_fast_tracepoints ()
2059 && agent_loaded_p ())
2061 struct fast_tpoint_collect_status status
;
2064 debug_printf ("Checking whether LWP %ld needs to move out of the "
2066 lwpid_of (current_thread
));
2068 fast_tpoint_collect_result r
2069 = linux_fast_tracepoint_collecting (lwp
, &status
);
2072 || (WSTOPSIG (*wstat
) != SIGILL
2073 && WSTOPSIG (*wstat
) != SIGFPE
2074 && WSTOPSIG (*wstat
) != SIGSEGV
2075 && WSTOPSIG (*wstat
) != SIGBUS
))
2077 lwp
->collecting_fast_tracepoint
= r
;
2079 if (r
!= fast_tpoint_collect_result::not_collecting
)
2081 if (r
== fast_tpoint_collect_result::before_insn
2082 && lwp
->exit_jump_pad_bkpt
== NULL
)
2084 /* Haven't executed the original instruction yet.
2085 Set breakpoint there, and wait till it's hit,
2086 then single-step until exiting the jump pad. */
2087 lwp
->exit_jump_pad_bkpt
2088 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2092 debug_printf ("Checking whether LWP %ld needs to move out of "
2093 "the jump pad...it does\n",
2094 lwpid_of (current_thread
));
2095 current_thread
= saved_thread
;
2102 /* If we get a synchronous signal while collecting, *and*
2103 while executing the (relocated) original instruction,
2104 reset the PC to point at the tpoint address, before
2105 reporting to GDB. Otherwise, it's an IPA lib bug: just
2106 report the signal to GDB, and pray for the best. */
2108 lwp
->collecting_fast_tracepoint
2109 = fast_tpoint_collect_result::not_collecting
;
2111 if (r
!= fast_tpoint_collect_result::not_collecting
2112 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2113 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2116 struct regcache
*regcache
;
2118 /* The si_addr on a few signals references the address
2119 of the faulting instruction. Adjust that as
2121 if ((WSTOPSIG (*wstat
) == SIGILL
2122 || WSTOPSIG (*wstat
) == SIGFPE
2123 || WSTOPSIG (*wstat
) == SIGBUS
2124 || WSTOPSIG (*wstat
) == SIGSEGV
)
2125 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2126 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2127 /* Final check just to make sure we don't clobber
2128 the siginfo of non-kernel-sent signals. */
2129 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2131 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2132 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2133 (PTRACE_TYPE_ARG3
) 0, &info
);
2136 regcache
= get_thread_regcache (current_thread
, 1);
2137 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2138 lwp
->stop_pc
= status
.tpoint_addr
;
2140 /* Cancel any fast tracepoint lock this thread was
2142 force_unlock_trace_buffer ();
2145 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2148 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2149 "stopping all threads momentarily.\n");
2151 stop_all_lwps (1, lwp
);
2153 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2154 lwp
->exit_jump_pad_bkpt
= NULL
;
2156 unstop_all_lwps (1, lwp
);
2158 gdb_assert (lwp
->suspended
>= 0);
2164 debug_printf ("Checking whether LWP %ld needs to move out of the "
2166 lwpid_of (current_thread
));
2168 current_thread
= saved_thread
;
2172 /* Enqueue one signal in the "signals to report later when out of the
2176 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2178 struct pending_signals
*p_sig
;
2179 struct thread_info
*thread
= get_lwp_thread (lwp
);
2182 debug_printf ("Deferring signal %d for LWP %ld.\n",
2183 WSTOPSIG (*wstat
), lwpid_of (thread
));
2187 struct pending_signals
*sig
;
2189 for (sig
= lwp
->pending_signals_to_report
;
2192 debug_printf (" Already queued %d\n",
2195 debug_printf (" (no more currently queued signals)\n");
2198 /* Don't enqueue non-RT signals if they are already in the deferred
2199 queue. (SIGSTOP being the easiest signal to see ending up here
2201 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2203 struct pending_signals
*sig
;
2205 for (sig
= lwp
->pending_signals_to_report
;
2209 if (sig
->signal
== WSTOPSIG (*wstat
))
2212 debug_printf ("Not requeuing already queued non-RT signal %d"
2221 p_sig
= XCNEW (struct pending_signals
);
2222 p_sig
->prev
= lwp
->pending_signals_to_report
;
2223 p_sig
->signal
= WSTOPSIG (*wstat
);
2225 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2228 lwp
->pending_signals_to_report
= p_sig
;
2231 /* Dequeue one signal from the "signals to report later when out of
2232 the jump pad" list. */
2235 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2237 struct thread_info
*thread
= get_lwp_thread (lwp
);
2239 if (lwp
->pending_signals_to_report
!= NULL
)
2241 struct pending_signals
**p_sig
;
2243 p_sig
= &lwp
->pending_signals_to_report
;
2244 while ((*p_sig
)->prev
!= NULL
)
2245 p_sig
= &(*p_sig
)->prev
;
2247 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2248 if ((*p_sig
)->info
.si_signo
!= 0)
2249 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2255 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2256 WSTOPSIG (*wstat
), lwpid_of (thread
));
2260 struct pending_signals
*sig
;
2262 for (sig
= lwp
->pending_signals_to_report
;
2265 debug_printf (" Still queued %d\n",
2268 debug_printf (" (no more queued signals)\n");
2277 /* Fetch the possibly triggered data watchpoint info and store it in
2280 On some archs, like x86, that use debug registers to set
2281 watchpoints, it's possible that the way to know which watched
2282 address trapped, is to check the register that is used to select
2283 which address to watch. Problem is, between setting the watchpoint
2284 and reading back which data address trapped, the user may change
2285 the set of watchpoints, and, as a consequence, GDB changes the
2286 debug registers in the inferior. To avoid reading back a stale
2287 stopped-data-address when that happens, we cache in LP the fact
2288 that a watchpoint trapped, and the corresponding data address, as
2289 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2290 registers meanwhile, we have the cached data we can rely on. */
2293 check_stopped_by_watchpoint (struct lwp_info
*child
)
2295 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2297 struct thread_info
*saved_thread
;
2299 saved_thread
= current_thread
;
2300 current_thread
= get_lwp_thread (child
);
2302 if (the_low_target
.stopped_by_watchpoint ())
2304 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2306 if (the_low_target
.stopped_data_address
!= NULL
)
2307 child
->stopped_data_address
2308 = the_low_target
.stopped_data_address ();
2310 child
->stopped_data_address
= 0;
2313 current_thread
= saved_thread
;
2316 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2319 /* Return the ptrace options that we want to try to enable. */
2322 linux_low_ptrace_options (int attached
)
2327 options
|= PTRACE_O_EXITKILL
;
2329 if (report_fork_events
)
2330 options
|= PTRACE_O_TRACEFORK
;
2332 if (report_vfork_events
)
2333 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2335 if (report_exec_events
)
2336 options
|= PTRACE_O_TRACEEXEC
;
2338 options
|= PTRACE_O_TRACESYSGOOD
;
2343 /* Do low-level handling of the event, and check if we should go on
2344 and pass it to caller code. Return the affected lwp if we are, or
2347 static struct lwp_info
*
2348 linux_low_filter_event (int lwpid
, int wstat
)
2350 struct lwp_info
*child
;
2351 struct thread_info
*thread
;
2352 int have_stop_pc
= 0;
2354 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2356 /* Check for stop events reported by a process we didn't already
2357 know about - anything not already in our LWP list.
2359 If we're expecting to receive stopped processes after
2360 fork, vfork, and clone events, then we'll just add the
2361 new one to our list and go back to waiting for the event
2362 to be reported - the stopped process might be returned
2363 from waitpid before or after the event is.
2365 But note the case of a non-leader thread exec'ing after the
2366 leader having exited, and gone from our lists (because
2367 check_zombie_leaders deleted it). The non-leader thread
2368 changes its tid to the tgid. */
2370 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2371 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2375 /* A multi-thread exec after we had seen the leader exiting. */
2378 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2379 "after exec.\n", lwpid
);
2382 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2383 child
= add_lwp (child_ptid
);
2385 current_thread
= child
->thread
;
2388 /* If we didn't find a process, one of two things presumably happened:
2389 - A process we started and then detached from has exited. Ignore it.
2390 - A process we are controlling has forked and the new child's stop
2391 was reported to us by the kernel. Save its PID. */
2392 if (child
== NULL
&& WIFSTOPPED (wstat
))
2394 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2397 else if (child
== NULL
)
2400 thread
= get_lwp_thread (child
);
2404 child
->last_status
= wstat
;
2406 /* Check if the thread has exited. */
2407 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2410 debug_printf ("LLFE: %d exited.\n", lwpid
);
2412 if (finish_step_over (child
))
2414 /* Unsuspend all other LWPs, and set them back running again. */
2415 unsuspend_all_lwps (child
);
2418 /* If there is at least one more LWP, then the exit signal was
2419 not the end of the debugged application and should be
2420 ignored, unless GDB wants to hear about thread exits. */
2421 if (report_thread_events
2422 || last_thread_of_process_p (pid_of (thread
)))
2424 /* Since events are serialized to GDB core, and we can't
2425 report this one right now. Leave the status pending for
2426 the next time we're able to report it. */
2427 mark_lwp_dead (child
, wstat
);
2437 gdb_assert (WIFSTOPPED (wstat
));
2439 if (WIFSTOPPED (wstat
))
2441 struct process_info
*proc
;
2443 /* Architecture-specific setup after inferior is running. */
2444 proc
= find_process_pid (pid_of (thread
));
2445 if (proc
->tdesc
== NULL
)
2449 /* This needs to happen after we have attached to the
2450 inferior and it is stopped for the first time, but
2451 before we access any inferior registers. */
2452 linux_arch_setup_thread (thread
);
2456 /* The process is started, but GDBserver will do
2457 architecture-specific setup after the program stops at
2458 the first instruction. */
2459 child
->status_pending_p
= 1;
2460 child
->status_pending
= wstat
;
2466 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2468 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2469 int options
= linux_low_ptrace_options (proc
->attached
);
2471 linux_enable_event_reporting (lwpid
, options
);
2472 child
->must_set_ptrace_flags
= 0;
2475 /* Always update syscall_state, even if it will be filtered later. */
2476 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2478 child
->syscall_state
2479 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2480 ? TARGET_WAITKIND_SYSCALL_RETURN
2481 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2485 /* Almost all other ptrace-stops are known to be outside of system
2486 calls, with further exceptions in handle_extended_wait. */
2487 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2490 /* Be careful to not overwrite stop_pc until save_stop_reason is
2492 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2493 && linux_is_extended_waitstatus (wstat
))
2495 child
->stop_pc
= get_pc (child
);
2496 if (handle_extended_wait (&child
, wstat
))
2498 /* The event has been handled, so just return without
2504 if (linux_wstatus_maybe_breakpoint (wstat
))
2506 if (save_stop_reason (child
))
2511 child
->stop_pc
= get_pc (child
);
2513 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2514 && child
->stop_expected
)
2517 debug_printf ("Expected stop.\n");
2518 child
->stop_expected
= 0;
2520 if (thread
->last_resume_kind
== resume_stop
)
2522 /* We want to report the stop to the core. Treat the
2523 SIGSTOP as a normal event. */
2525 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2526 target_pid_to_str (ptid_of (thread
)));
2528 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2530 /* Stopping threads. We don't want this SIGSTOP to end up
2533 debug_printf ("LLW: SIGSTOP caught for %s "
2534 "while stopping threads.\n",
2535 target_pid_to_str (ptid_of (thread
)));
2540 /* This is a delayed SIGSTOP. Filter out the event. */
2542 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2543 child
->stepping
? "step" : "continue",
2544 target_pid_to_str (ptid_of (thread
)));
2546 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2551 child
->status_pending_p
= 1;
2552 child
->status_pending
= wstat
;
2556 /* Return true if THREAD is doing hardware single step. */
2559 maybe_hw_step (struct thread_info
*thread
)
2561 if (can_hardware_single_step ())
2565 /* GDBserver must insert single-step breakpoint for software
2567 gdb_assert (has_single_step_breakpoints (thread
));
2572 /* Resume LWPs that are currently stopped without any pending status
2573 to report, but are resumed from the core's perspective. */
2576 resume_stopped_resumed_lwps (thread_info
*thread
)
2578 struct lwp_info
*lp
= get_thread_lwp (thread
);
2582 && !lp
->status_pending_p
2583 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2587 if (thread
->last_resume_kind
== resume_step
)
2588 step
= maybe_hw_step (thread
);
2591 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2592 target_pid_to_str (ptid_of (thread
)),
2593 paddress (lp
->stop_pc
),
2596 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2600 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2601 match FILTER_PTID (leaving others pending). The PTIDs can be:
2602 minus_one_ptid, to specify any child; a pid PTID, specifying all
2603 lwps of a thread group; or a PTID representing a single lwp. Store
2604 the stop status through the status pointer WSTAT. OPTIONS is
2605 passed to the waitpid call. Return 0 if no event was found and
2606 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2607 was found. Return the PID of the stopped child otherwise. */
2610 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2611 int *wstatp
, int options
)
2613 struct thread_info
*event_thread
;
2614 struct lwp_info
*event_child
, *requested_child
;
2615 sigset_t block_mask
, prev_mask
;
2618 /* N.B. event_thread points to the thread_info struct that contains
2619 event_child. Keep them in sync. */
2620 event_thread
= NULL
;
2622 requested_child
= NULL
;
2624 /* Check for a lwp with a pending status. */
2626 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2628 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2630 return status_pending_p_callback (thread
, filter_ptid
);
2633 if (event_thread
!= NULL
)
2634 event_child
= get_thread_lwp (event_thread
);
2635 if (debug_threads
&& event_thread
)
2636 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2638 else if (!ptid_equal (filter_ptid
, null_ptid
))
2640 requested_child
= find_lwp_pid (filter_ptid
);
2642 if (stopping_threads
== NOT_STOPPING_THREADS
2643 && requested_child
->status_pending_p
2644 && (requested_child
->collecting_fast_tracepoint
2645 != fast_tpoint_collect_result::not_collecting
))
2647 enqueue_one_deferred_signal (requested_child
,
2648 &requested_child
->status_pending
);
2649 requested_child
->status_pending_p
= 0;
2650 requested_child
->status_pending
= 0;
2651 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2654 if (requested_child
->suspended
2655 && requested_child
->status_pending_p
)
2657 internal_error (__FILE__
, __LINE__
,
2658 "requesting an event out of a"
2659 " suspended child?");
2662 if (requested_child
->status_pending_p
)
2664 event_child
= requested_child
;
2665 event_thread
= get_lwp_thread (event_child
);
2669 if (event_child
!= NULL
)
2672 debug_printf ("Got an event from pending child %ld (%04x)\n",
2673 lwpid_of (event_thread
), event_child
->status_pending
);
2674 *wstatp
= event_child
->status_pending
;
2675 event_child
->status_pending_p
= 0;
2676 event_child
->status_pending
= 0;
2677 current_thread
= event_thread
;
2678 return lwpid_of (event_thread
);
2681 /* But if we don't find a pending event, we'll have to wait.
2683 We only enter this loop if no process has a pending wait status.
2684 Thus any action taken in response to a wait status inside this
2685 loop is responding as soon as we detect the status, not after any
2688 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2689 all signals while here. */
2690 sigfillset (&block_mask
);
2691 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2693 /* Always pull all events out of the kernel. We'll randomly select
2694 an event LWP out of all that have events, to prevent
2696 while (event_child
== NULL
)
2700 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2703 - If the thread group leader exits while other threads in the
2704 thread group still exist, waitpid(TGID, ...) hangs. That
2705 waitpid won't return an exit status until the other threads
2706 in the group are reaped.
2708 - When a non-leader thread execs, that thread just vanishes
2709 without reporting an exit (so we'd hang if we waited for it
2710 explicitly in that case). The exec event is reported to
2713 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2716 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2717 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2723 debug_printf ("LLW: waitpid %ld received %s\n",
2724 (long) ret
, status_to_str (*wstatp
));
2727 /* Filter all events. IOW, leave all events pending. We'll
2728 randomly select an event LWP out of all that have events
2730 linux_low_filter_event (ret
, *wstatp
);
2731 /* Retry until nothing comes out of waitpid. A single
2732 SIGCHLD can indicate more than one child stopped. */
2736 /* Now that we've pulled all events out of the kernel, resume
2737 LWPs that don't have an interesting event to report. */
2738 if (stopping_threads
== NOT_STOPPING_THREADS
)
2739 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2741 /* ... and find an LWP with a status to report to the core, if
2743 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2745 return status_pending_p_callback (thread
, filter_ptid
);
2748 if (event_thread
!= NULL
)
2750 event_child
= get_thread_lwp (event_thread
);
2751 *wstatp
= event_child
->status_pending
;
2752 event_child
->status_pending_p
= 0;
2753 event_child
->status_pending
= 0;
2757 /* Check for zombie thread group leaders. Those can't be reaped
2758 until all other threads in the thread group are. */
2759 check_zombie_leaders ();
2761 auto not_stopped
= [&] (thread_info
*thread
)
2763 return not_stopped_callback (thread
, wait_ptid
);
2766 /* If there are no resumed children left in the set of LWPs we
2767 want to wait for, bail. We can't just block in
2768 waitpid/sigsuspend, because lwps might have been left stopped
2769 in trace-stop state, and we'd be stuck forever waiting for
2770 their status to change (which would only happen if we resumed
2771 them). Even if WNOHANG is set, this return code is preferred
2772 over 0 (below), as it is more detailed. */
2773 if (find_thread (not_stopped
) == NULL
)
2776 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2777 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2781 /* No interesting event to report to the caller. */
2782 if ((options
& WNOHANG
))
2785 debug_printf ("WNOHANG set, no event found\n");
2787 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2791 /* Block until we get an event reported with SIGCHLD. */
2793 debug_printf ("sigsuspend'ing\n");
2795 sigsuspend (&prev_mask
);
2796 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2800 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2802 current_thread
= event_thread
;
2804 return lwpid_of (event_thread
);
2807 /* Wait for an event from child(ren) PTID. PTIDs can be:
2808 minus_one_ptid, to specify any child; a pid PTID, specifying all
2809 lwps of a thread group; or a PTID representing a single lwp. Store
2810 the stop status through the status pointer WSTAT. OPTIONS is
2811 passed to the waitpid call. Return 0 if no event was found and
2812 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2813 was found. Return the PID of the stopped child otherwise. */
2816 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2818 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2821 /* Count the LWP's that have had events. */
2824 count_events_callback (thread_info
*thread
, void *data
)
2826 struct lwp_info
*lp
= get_thread_lwp (thread
);
2827 int *count
= (int *) data
;
2829 gdb_assert (count
!= NULL
);
2831 /* Count only resumed LWPs that have an event pending. */
2832 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2833 && lp
->status_pending_p
)
2839 /* Select the LWP (if any) that is currently being single-stepped. */
2842 select_singlestep_lwp_callback (thread_info
*thread
, void *data
)
2844 struct lwp_info
*lp
= get_thread_lwp (thread
);
2846 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2847 && thread
->last_resume_kind
== resume_step
2848 && lp
->status_pending_p
)
2854 /* Select the Nth LWP that has had an event. */
2857 select_event_lwp_callback (thread_info
*thread
, void *data
)
2859 struct lwp_info
*lp
= get_thread_lwp (thread
);
2860 int *selector
= (int *) data
;
2862 gdb_assert (selector
!= NULL
);
2864 /* Select only resumed LWPs that have an event pending. */
2865 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2866 && lp
->status_pending_p
)
2867 if ((*selector
)-- == 0)
2873 /* Select one LWP out of those that have events pending. */
2876 select_event_lwp (struct lwp_info
**orig_lp
)
2879 int random_selector
;
2880 struct thread_info
*event_thread
= NULL
;
2882 /* In all-stop, give preference to the LWP that is being
2883 single-stepped. There will be at most one, and it's the LWP that
2884 the core is most interested in. If we didn't do this, then we'd
2885 have to handle pending step SIGTRAPs somehow in case the core
2886 later continues the previously-stepped thread, otherwise we'd
2887 report the pending SIGTRAP, and the core, not having stepped the
2888 thread, wouldn't understand what the trap was for, and therefore
2889 would report it to the user as a random signal. */
2893 = (struct thread_info
*) find_inferior (&all_threads
,
2894 select_singlestep_lwp_callback
,
2896 if (event_thread
!= NULL
)
2899 debug_printf ("SEL: Select single-step %s\n",
2900 target_pid_to_str (ptid_of (event_thread
)));
2903 if (event_thread
== NULL
)
2905 /* No single-stepping LWP. Select one at random, out of those
2906 which have had events. */
2908 /* First see how many events we have. */
2909 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2910 gdb_assert (num_events
> 0);
2912 /* Now randomly pick a LWP out of those that have had
2914 random_selector
= (int)
2915 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2917 if (debug_threads
&& num_events
> 1)
2918 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2919 num_events
, random_selector
);
2922 = (struct thread_info
*) find_inferior (&all_threads
,
2923 select_event_lwp_callback
,
2927 if (event_thread
!= NULL
)
2929 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2931 /* Switch the event LWP. */
2932 *orig_lp
= event_lp
;
2936 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2940 unsuspend_all_lwps (struct lwp_info
*except
)
2942 for_each_thread ([&] (thread_info
*thread
)
2944 lwp_info
*lwp
= get_thread_lwp (thread
);
2947 lwp_suspended_decr (lwp
);
2951 static void move_out_of_jump_pad_callback (thread_info
*thread
);
2952 static bool stuck_in_jump_pad_callback (thread_info
*thread
);
2953 static int lwp_running (thread_info
*thread
, void *data
);
2954 static ptid_t
linux_wait_1 (ptid_t ptid
,
2955 struct target_waitstatus
*ourstatus
,
2956 int target_options
);
2958 /* Stabilize threads (move out of jump pads).
2960 If a thread is midway collecting a fast tracepoint, we need to
2961 finish the collection and move it out of the jump pad before
2962 reporting the signal.
2964 This avoids recursion while collecting (when a signal arrives
2965 midway, and the signal handler itself collects), which would trash
2966 the trace buffer. In case the user set a breakpoint in a signal
2967 handler, this avoids the backtrace showing the jump pad, etc..
2968 Most importantly, there are certain things we can't do safely if
2969 threads are stopped in a jump pad (or in its callee's). For
2972 - starting a new trace run. A thread still collecting the
2973 previous run, could trash the trace buffer when resumed. The trace
2974 buffer control structures would have been reset but the thread had
2975 no way to tell. The thread could even midway memcpy'ing to the
2976 buffer, which would mean that when resumed, it would clobber the
2977 trace buffer that had been set for a new run.
2979 - we can't rewrite/reuse the jump pads for new tracepoints
2980 safely. Say you do tstart while a thread is stopped midway while
2981 collecting. When the thread is later resumed, it finishes the
2982 collection, and returns to the jump pad, to execute the original
2983 instruction that was under the tracepoint jump at the time the
2984 older run had been started. If the jump pad had been rewritten
2985 since for something else in the new run, the thread would now
2986 execute the wrong / random instructions. */
2989 linux_stabilize_threads (void)
2991 thread_info
*thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
2993 if (thread_stuck
!= NULL
)
2996 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2997 lwpid_of (thread_stuck
));
3001 thread_info
*saved_thread
= current_thread
;
3003 stabilizing_threads
= 1;
3006 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
3008 /* Loop until all are stopped out of the jump pads. */
3009 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
3011 struct target_waitstatus ourstatus
;
3012 struct lwp_info
*lwp
;
3015 /* Note that we go through the full wait even loop. While
3016 moving threads out of jump pad, we need to be able to step
3017 over internal breakpoints and such. */
3018 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
3020 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
3022 lwp
= get_thread_lwp (current_thread
);
3025 lwp_suspended_inc (lwp
);
3027 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3028 || current_thread
->last_resume_kind
== resume_stop
)
3030 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3031 enqueue_one_deferred_signal (lwp
, &wstat
);
3036 unsuspend_all_lwps (NULL
);
3038 stabilizing_threads
= 0;
3040 current_thread
= saved_thread
;
3044 thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
3046 if (thread_stuck
!= NULL
)
3047 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3048 lwpid_of (thread_stuck
));
3052 /* Convenience function that is called when the kernel reports an
3053 event that is not passed out to GDB. */
3056 ignore_event (struct target_waitstatus
*ourstatus
)
3058 /* If we got an event, there may still be others, as a single
3059 SIGCHLD can indicate more than one child stopped. This forces
3060 another target_wait call. */
3063 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3067 /* Convenience function that is called when the kernel reports an exit
3068 event. This decides whether to report the event to GDB as a
3069 process exit event, a thread exit event, or to suppress the
3073 filter_exit_event (struct lwp_info
*event_child
,
3074 struct target_waitstatus
*ourstatus
)
3076 struct thread_info
*thread
= get_lwp_thread (event_child
);
3077 ptid_t ptid
= ptid_of (thread
);
3079 if (!last_thread_of_process_p (pid_of (thread
)))
3081 if (report_thread_events
)
3082 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3084 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3086 delete_lwp (event_child
);
3091 /* Returns 1 if GDB is interested in any event_child syscalls. */
3094 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3096 struct thread_info
*thread
= get_lwp_thread (event_child
);
3097 struct process_info
*proc
= get_thread_process (thread
);
3099 return !proc
->syscalls_to_catch
.empty ();
3102 /* Returns 1 if GDB is interested in the event_child syscall.
3103 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3106 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3109 struct thread_info
*thread
= get_lwp_thread (event_child
);
3110 struct process_info
*proc
= get_thread_process (thread
);
3112 if (proc
->syscalls_to_catch
.empty ())
3115 if (proc
->syscalls_to_catch
[0] == ANY_SYSCALL
)
3118 get_syscall_trapinfo (event_child
, &sysno
);
3120 for (int iter
: proc
->syscalls_to_catch
)
3127 /* Wait for process, returns status. */
3130 linux_wait_1 (ptid_t ptid
,
3131 struct target_waitstatus
*ourstatus
, int target_options
)
3134 struct lwp_info
*event_child
;
3137 int step_over_finished
;
3138 int bp_explains_trap
;
3139 int maybe_internal_trap
;
3148 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3151 /* Translate generic target options into linux options. */
3153 if (target_options
& TARGET_WNOHANG
)
3156 bp_explains_trap
= 0;
3159 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3161 auto status_pending_p_any
= [&] (thread_info
*thread
)
3163 return status_pending_p_callback (thread
, minus_one_ptid
);
3166 auto not_stopped
= [&] (thread_info
*thread
)
3168 return not_stopped_callback (thread
, minus_one_ptid
);
3171 /* Find a resumed LWP, if any. */
3172 if (find_thread (status_pending_p_any
) != NULL
)
3174 else if (find_thread (not_stopped
) != NULL
)
3179 if (ptid_equal (step_over_bkpt
, null_ptid
))
3180 pid
= linux_wait_for_event (ptid
, &w
, options
);
3184 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3185 target_pid_to_str (step_over_bkpt
));
3186 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3189 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3191 gdb_assert (target_options
& TARGET_WNOHANG
);
3195 debug_printf ("linux_wait_1 ret = null_ptid, "
3196 "TARGET_WAITKIND_IGNORE\n");
3200 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3207 debug_printf ("linux_wait_1 ret = null_ptid, "
3208 "TARGET_WAITKIND_NO_RESUMED\n");
3212 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3216 event_child
= get_thread_lwp (current_thread
);
3218 /* linux_wait_for_event only returns an exit status for the last
3219 child of a process. Report it. */
3220 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3224 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3225 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3229 debug_printf ("linux_wait_1 ret = %s, exited with "
3231 target_pid_to_str (ptid_of (current_thread
)),
3238 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3239 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3243 debug_printf ("linux_wait_1 ret = %s, terminated with "
3245 target_pid_to_str (ptid_of (current_thread
)),
3251 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3252 return filter_exit_event (event_child
, ourstatus
);
3254 return ptid_of (current_thread
);
3257 /* If step-over executes a breakpoint instruction, in the case of a
3258 hardware single step it means a gdb/gdbserver breakpoint had been
3259 planted on top of a permanent breakpoint, in the case of a software
3260 single step it may just mean that gdbserver hit the reinsert breakpoint.
3261 The PC has been adjusted by save_stop_reason to point at
3262 the breakpoint address.
3263 So in the case of the hardware single step advance the PC manually
3264 past the breakpoint and in the case of software single step advance only
3265 if it's not the single_step_breakpoint we are hitting.
3266 This avoids that a program would keep trapping a permanent breakpoint
3268 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3269 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3270 && (event_child
->stepping
3271 || !single_step_breakpoint_inserted_here (event_child
->stop_pc
)))
3273 int increment_pc
= 0;
3274 int breakpoint_kind
= 0;
3275 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3278 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3279 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3283 debug_printf ("step-over for %s executed software breakpoint\n",
3284 target_pid_to_str (ptid_of (current_thread
)));
3287 if (increment_pc
!= 0)
3289 struct regcache
*regcache
3290 = get_thread_regcache (current_thread
, 1);
3292 event_child
->stop_pc
+= increment_pc
;
3293 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3295 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3296 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3300 /* If this event was not handled before, and is not a SIGTRAP, we
3301 report it. SIGILL and SIGSEGV are also treated as traps in case
3302 a breakpoint is inserted at the current PC. If this target does
3303 not support internal breakpoints at all, we also report the
3304 SIGTRAP without further processing; it's of no concern to us. */
3306 = (supports_breakpoints ()
3307 && (WSTOPSIG (w
) == SIGTRAP
3308 || ((WSTOPSIG (w
) == SIGILL
3309 || WSTOPSIG (w
) == SIGSEGV
)
3310 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3312 if (maybe_internal_trap
)
3314 /* Handle anything that requires bookkeeping before deciding to
3315 report the event or continue waiting. */
3317 /* First check if we can explain the SIGTRAP with an internal
3318 breakpoint, or if we should possibly report the event to GDB.
3319 Do this before anything that may remove or insert a
3321 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3323 /* We have a SIGTRAP, possibly a step-over dance has just
3324 finished. If so, tweak the state machine accordingly,
3325 reinsert breakpoints and delete any single-step
3327 step_over_finished
= finish_step_over (event_child
);
3329 /* Now invoke the callbacks of any internal breakpoints there. */
3330 check_breakpoints (event_child
->stop_pc
);
3332 /* Handle tracepoint data collecting. This may overflow the
3333 trace buffer, and cause a tracing stop, removing
3335 trace_event
= handle_tracepoints (event_child
);
3337 if (bp_explains_trap
)
3340 debug_printf ("Hit a gdbserver breakpoint.\n");
3345 /* We have some other signal, possibly a step-over dance was in
3346 progress, and it should be cancelled too. */
3347 step_over_finished
= finish_step_over (event_child
);
3350 /* We have all the data we need. Either report the event to GDB, or
3351 resume threads and keep waiting for more. */
3353 /* If we're collecting a fast tracepoint, finish the collection and
3354 move out of the jump pad before delivering a signal. See
3355 linux_stabilize_threads. */
3358 && WSTOPSIG (w
) != SIGTRAP
3359 && supports_fast_tracepoints ()
3360 && agent_loaded_p ())
3363 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3364 "to defer or adjust it.\n",
3365 WSTOPSIG (w
), lwpid_of (current_thread
));
3367 /* Allow debugging the jump pad itself. */
3368 if (current_thread
->last_resume_kind
!= resume_step
3369 && maybe_move_out_of_jump_pad (event_child
, &w
))
3371 enqueue_one_deferred_signal (event_child
, &w
);
3374 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3375 WSTOPSIG (w
), lwpid_of (current_thread
));
3377 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3381 return ignore_event (ourstatus
);
3385 if (event_child
->collecting_fast_tracepoint
3386 != fast_tpoint_collect_result::not_collecting
)
3389 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3390 "Check if we're already there.\n",
3391 lwpid_of (current_thread
),
3392 (int) event_child
->collecting_fast_tracepoint
);
3396 event_child
->collecting_fast_tracepoint
3397 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3399 if (event_child
->collecting_fast_tracepoint
3400 != fast_tpoint_collect_result::before_insn
)
3402 /* No longer need this breakpoint. */
3403 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3406 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3407 "stopping all threads momentarily.\n");
3409 /* Other running threads could hit this breakpoint.
3410 We don't handle moribund locations like GDB does,
3411 instead we always pause all threads when removing
3412 breakpoints, so that any step-over or
3413 decr_pc_after_break adjustment is always taken
3414 care of while the breakpoint is still
3416 stop_all_lwps (1, event_child
);
3418 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3419 event_child
->exit_jump_pad_bkpt
= NULL
;
3421 unstop_all_lwps (1, event_child
);
3423 gdb_assert (event_child
->suspended
>= 0);
3427 if (event_child
->collecting_fast_tracepoint
3428 == fast_tpoint_collect_result::not_collecting
)
3431 debug_printf ("fast tracepoint finished "
3432 "collecting successfully.\n");
3434 /* We may have a deferred signal to report. */
3435 if (dequeue_one_deferred_signal (event_child
, &w
))
3438 debug_printf ("dequeued one signal.\n");
3443 debug_printf ("no deferred signals.\n");
3445 if (stabilizing_threads
)
3447 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3448 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3452 debug_printf ("linux_wait_1 ret = %s, stopped "
3453 "while stabilizing threads\n",
3454 target_pid_to_str (ptid_of (current_thread
)));
3458 return ptid_of (current_thread
);
3464 /* Check whether GDB would be interested in this event. */
3466 /* Check if GDB is interested in this syscall. */
3468 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3469 && !gdb_catch_this_syscall_p (event_child
))
3473 debug_printf ("Ignored syscall for LWP %ld.\n",
3474 lwpid_of (current_thread
));
3477 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3482 return ignore_event (ourstatus
);
3485 /* If GDB is not interested in this signal, don't stop other
3486 threads, and don't report it to GDB. Just resume the inferior
3487 right away. We do this for threading-related signals as well as
3488 any that GDB specifically requested we ignore. But never ignore
3489 SIGSTOP if we sent it ourselves, and do not ignore signals when
3490 stepping - they may require special handling to skip the signal
3491 handler. Also never ignore signals that could be caused by a
3494 && current_thread
->last_resume_kind
!= resume_step
3496 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3497 (current_process ()->priv
->thread_db
!= NULL
3498 && (WSTOPSIG (w
) == __SIGRTMIN
3499 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3502 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3503 && !(WSTOPSIG (w
) == SIGSTOP
3504 && current_thread
->last_resume_kind
== resume_stop
)
3505 && !linux_wstatus_maybe_breakpoint (w
))))
3507 siginfo_t info
, *info_p
;
3510 debug_printf ("Ignored signal %d for LWP %ld.\n",
3511 WSTOPSIG (w
), lwpid_of (current_thread
));
3513 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3514 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3519 if (step_over_finished
)
3521 /* We cancelled this thread's step-over above. We still
3522 need to unsuspend all other LWPs, and set them back
3523 running again while the signal handler runs. */
3524 unsuspend_all_lwps (event_child
);
3526 /* Enqueue the pending signal info so that proceed_all_lwps
3528 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3530 proceed_all_lwps ();
3534 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3535 WSTOPSIG (w
), info_p
);
3541 return ignore_event (ourstatus
);
3544 /* Note that all addresses are always "out of the step range" when
3545 there's no range to begin with. */
3546 in_step_range
= lwp_in_step_range (event_child
);
3548 /* If GDB wanted this thread to single step, and the thread is out
3549 of the step range, we always want to report the SIGTRAP, and let
3550 GDB handle it. Watchpoints should always be reported. So should
3551 signals we can't explain. A SIGTRAP we can't explain could be a
3552 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3553 do, we're be able to handle GDB breakpoints on top of internal
3554 breakpoints, by handling the internal breakpoint and still
3555 reporting the event to GDB. If we don't, we're out of luck, GDB
3556 won't see the breakpoint hit. If we see a single-step event but
3557 the thread should be continuing, don't pass the trap to gdb.
3558 That indicates that we had previously finished a single-step but
3559 left the single-step pending -- see
3560 complete_ongoing_step_over. */
3561 report_to_gdb
= (!maybe_internal_trap
3562 || (current_thread
->last_resume_kind
== resume_step
3564 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3566 && !bp_explains_trap
3568 && !step_over_finished
3569 && !(current_thread
->last_resume_kind
== resume_continue
3570 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3571 || (gdb_breakpoint_here (event_child
->stop_pc
)
3572 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3573 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3574 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3576 run_breakpoint_commands (event_child
->stop_pc
);
3578 /* We found no reason GDB would want us to stop. We either hit one
3579 of our own breakpoints, or finished an internal step GDB
3580 shouldn't know about. */
3585 if (bp_explains_trap
)
3586 debug_printf ("Hit a gdbserver breakpoint.\n");
3587 if (step_over_finished
)
3588 debug_printf ("Step-over finished.\n");
3590 debug_printf ("Tracepoint event.\n");
3591 if (lwp_in_step_range (event_child
))
3592 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3593 paddress (event_child
->stop_pc
),
3594 paddress (event_child
->step_range_start
),
3595 paddress (event_child
->step_range_end
));
3598 /* We're not reporting this breakpoint to GDB, so apply the
3599 decr_pc_after_break adjustment to the inferior's regcache
3602 if (the_low_target
.set_pc
!= NULL
)
3604 struct regcache
*regcache
3605 = get_thread_regcache (current_thread
, 1);
3606 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3609 if (step_over_finished
)
3611 /* If we have finished stepping over a breakpoint, we've
3612 stopped and suspended all LWPs momentarily except the
3613 stepping one. This is where we resume them all again.
3614 We're going to keep waiting, so use proceed, which
3615 handles stepping over the next breakpoint. */
3616 unsuspend_all_lwps (event_child
);
3620 /* Remove the single-step breakpoints if any. Note that
3621 there isn't single-step breakpoint if we finished stepping
3623 if (can_software_single_step ()
3624 && has_single_step_breakpoints (current_thread
))
3626 stop_all_lwps (0, event_child
);
3627 delete_single_step_breakpoints (current_thread
);
3628 unstop_all_lwps (0, event_child
);
3633 debug_printf ("proceeding all threads.\n");
3634 proceed_all_lwps ();
3639 return ignore_event (ourstatus
);
3644 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3647 = target_waitstatus_to_string (&event_child
->waitstatus
);
3649 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3650 lwpid_of (get_lwp_thread (event_child
)), str
.c_str ());
3652 if (current_thread
->last_resume_kind
== resume_step
)
3654 if (event_child
->step_range_start
== event_child
->step_range_end
)
3655 debug_printf ("GDB wanted to single-step, reporting event.\n");
3656 else if (!lwp_in_step_range (event_child
))
3657 debug_printf ("Out of step range, reporting event.\n");
3659 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3660 debug_printf ("Stopped by watchpoint.\n");
3661 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3662 debug_printf ("Stopped by GDB breakpoint.\n");
3664 debug_printf ("Hit a non-gdbserver trap event.\n");
3667 /* Alright, we're going to report a stop. */
3669 /* Remove single-step breakpoints. */
3670 if (can_software_single_step ())
3672 /* Remove single-step breakpoints or not. It it is true, stop all
3673 lwps, so that other threads won't hit the breakpoint in the
3675 int remove_single_step_breakpoints_p
= 0;
3679 remove_single_step_breakpoints_p
3680 = has_single_step_breakpoints (current_thread
);
3684 /* In all-stop, a stop reply cancels all previous resume
3685 requests. Delete all single-step breakpoints. */
3687 find_thread ([&] (thread_info
*thread
) {
3688 if (has_single_step_breakpoints (thread
))
3690 remove_single_step_breakpoints_p
= 1;
3698 if (remove_single_step_breakpoints_p
)
3700 /* If we remove single-step breakpoints from memory, stop all lwps,
3701 so that other threads won't hit the breakpoint in the staled
3703 stop_all_lwps (0, event_child
);
3707 gdb_assert (has_single_step_breakpoints (current_thread
));
3708 delete_single_step_breakpoints (current_thread
);
3712 for_each_thread ([] (thread_info
*thread
){
3713 if (has_single_step_breakpoints (thread
))
3714 delete_single_step_breakpoints (thread
);
3718 unstop_all_lwps (0, event_child
);
3722 if (!stabilizing_threads
)
3724 /* In all-stop, stop all threads. */
3726 stop_all_lwps (0, NULL
);
3728 if (step_over_finished
)
3732 /* If we were doing a step-over, all other threads but
3733 the stepping one had been paused in start_step_over,
3734 with their suspend counts incremented. We don't want
3735 to do a full unstop/unpause, because we're in
3736 all-stop mode (so we want threads stopped), but we
3737 still need to unsuspend the other threads, to
3738 decrement their `suspended' count back. */
3739 unsuspend_all_lwps (event_child
);
3743 /* If we just finished a step-over, then all threads had
3744 been momentarily paused. In all-stop, that's fine,
3745 we want threads stopped by now anyway. In non-stop,
3746 we need to re-resume threads that GDB wanted to be
3748 unstop_all_lwps (1, event_child
);
3752 /* If we're not waiting for a specific LWP, choose an event LWP
3753 from among those that have had events. Giving equal priority
3754 to all LWPs that have had events helps prevent
3756 if (ptid_equal (ptid
, minus_one_ptid
))
3758 event_child
->status_pending_p
= 1;
3759 event_child
->status_pending
= w
;
3761 select_event_lwp (&event_child
);
3763 /* current_thread and event_child must stay in sync. */
3764 current_thread
= get_lwp_thread (event_child
);
3766 event_child
->status_pending_p
= 0;
3767 w
= event_child
->status_pending
;
3771 /* Stabilize threads (move out of jump pads). */
3773 stabilize_threads ();
3777 /* If we just finished a step-over, then all threads had been
3778 momentarily paused. In all-stop, that's fine, we want
3779 threads stopped by now anyway. In non-stop, we need to
3780 re-resume threads that GDB wanted to be running. */
3781 if (step_over_finished
)
3782 unstop_all_lwps (1, event_child
);
3785 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3787 /* If the reported event is an exit, fork, vfork or exec, let
3790 /* Break the unreported fork relationship chain. */
3791 if (event_child
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
3792 || event_child
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
)
3794 event_child
->fork_relative
->fork_relative
= NULL
;
3795 event_child
->fork_relative
= NULL
;
3798 *ourstatus
= event_child
->waitstatus
;
3799 /* Clear the event lwp's waitstatus since we handled it already. */
3800 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3803 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3805 /* Now that we've selected our final event LWP, un-adjust its PC if
3806 it was a software breakpoint, and the client doesn't know we can
3807 adjust the breakpoint ourselves. */
3808 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3809 && !swbreak_feature
)
3811 int decr_pc
= the_low_target
.decr_pc_after_break
;
3815 struct regcache
*regcache
3816 = get_thread_regcache (current_thread
, 1);
3817 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3821 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3823 get_syscall_trapinfo (event_child
,
3824 &ourstatus
->value
.syscall_number
);
3825 ourstatus
->kind
= event_child
->syscall_state
;
3827 else if (current_thread
->last_resume_kind
== resume_stop
3828 && WSTOPSIG (w
) == SIGSTOP
)
3830 /* A thread that has been requested to stop by GDB with vCont;t,
3831 and it stopped cleanly, so report as SIG0. The use of
3832 SIGSTOP is an implementation detail. */
3833 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3835 else if (current_thread
->last_resume_kind
== resume_stop
3836 && WSTOPSIG (w
) != SIGSTOP
)
3838 /* A thread that has been requested to stop by GDB with vCont;t,
3839 but, it stopped for other reasons. */
3840 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3842 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3844 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3847 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3851 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3852 target_pid_to_str (ptid_of (current_thread
)),
3853 ourstatus
->kind
, ourstatus
->value
.sig
);
3857 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3858 return filter_exit_event (event_child
, ourstatus
);
3860 return ptid_of (current_thread
);
3863 /* Get rid of any pending event in the pipe. */
3865 async_file_flush (void)
3871 ret
= read (linux_event_pipe
[0], &buf
, 1);
3872 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3875 /* Put something in the pipe, so the event loop wakes up. */
3877 async_file_mark (void)
3881 async_file_flush ();
3884 ret
= write (linux_event_pipe
[1], "+", 1);
3885 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3887 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3888 be awakened anyway. */
3892 linux_wait (ptid_t ptid
,
3893 struct target_waitstatus
*ourstatus
, int target_options
)
3897 /* Flush the async file first. */
3898 if (target_is_async_p ())
3899 async_file_flush ();
3903 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3905 while ((target_options
& TARGET_WNOHANG
) == 0
3906 && ptid_equal (event_ptid
, null_ptid
)
3907 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3909 /* If at least one stop was reported, there may be more. A single
3910 SIGCHLD can signal more than one child stop. */
3911 if (target_is_async_p ()
3912 && (target_options
& TARGET_WNOHANG
) != 0
3913 && !ptid_equal (event_ptid
, null_ptid
))
3919 /* Send a signal to an LWP. */
3922 kill_lwp (unsigned long lwpid
, int signo
)
3927 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3928 if (errno
== ENOSYS
)
3930 /* If tkill fails, then we are not using nptl threads, a
3931 configuration we no longer support. */
3932 perror_with_name (("tkill"));
3938 linux_stop_lwp (struct lwp_info
*lwp
)
3944 send_sigstop (struct lwp_info
*lwp
)
3948 pid
= lwpid_of (get_lwp_thread (lwp
));
3950 /* If we already have a pending stop signal for this process, don't
3952 if (lwp
->stop_expected
)
3955 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3961 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3963 lwp
->stop_expected
= 1;
3964 kill_lwp (pid
, SIGSTOP
);
3968 send_sigstop_callback (thread_info
*thread
, void *except
)
3970 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3972 /* Ignore EXCEPT. */
3983 /* Increment the suspend count of an LWP, and stop it, if not stopped
3986 suspend_and_send_sigstop_callback (thread_info
*thread
, void *except
)
3988 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3990 /* Ignore EXCEPT. */
3994 lwp_suspended_inc (lwp
);
3996 return send_sigstop_callback (thread
, except
);
4000 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
4002 /* Store the exit status for later. */
4003 lwp
->status_pending_p
= 1;
4004 lwp
->status_pending
= wstat
;
4006 /* Store in waitstatus as well, as there's nothing else to process
4008 if (WIFEXITED (wstat
))
4010 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
4011 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
4013 else if (WIFSIGNALED (wstat
))
4015 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
4016 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
4019 /* Prevent trying to stop it. */
4022 /* No further stops are expected from a dead lwp. */
4023 lwp
->stop_expected
= 0;
4026 /* Return true if LWP has exited already, and has a pending exit event
4027 to report to GDB. */
4030 lwp_is_marked_dead (struct lwp_info
*lwp
)
4032 return (lwp
->status_pending_p
4033 && (WIFEXITED (lwp
->status_pending
)
4034 || WIFSIGNALED (lwp
->status_pending
)));
4037 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4040 wait_for_sigstop (void)
4042 struct thread_info
*saved_thread
;
4047 saved_thread
= current_thread
;
4048 if (saved_thread
!= NULL
)
4049 saved_tid
= saved_thread
->id
;
4051 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4054 debug_printf ("wait_for_sigstop: pulling events\n");
4056 /* Passing NULL_PTID as filter indicates we want all events to be
4057 left pending. Eventually this returns when there are no
4058 unwaited-for children left. */
4059 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4061 gdb_assert (ret
== -1);
4063 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4064 current_thread
= saved_thread
;
4068 debug_printf ("Previously current thread died.\n");
4070 /* We can't change the current inferior behind GDB's back,
4071 otherwise, a subsequent command may apply to the wrong
4073 current_thread
= NULL
;
4077 /* Returns true if THREAD is stopped in a jump pad, and we can't
4078 move it out, because we need to report the stop event to GDB. For
4079 example, if the user puts a breakpoint in the jump pad, it's
4080 because she wants to debug it. */
4083 stuck_in_jump_pad_callback (thread_info
*thread
)
4085 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4087 if (lwp
->suspended
!= 0)
4089 internal_error (__FILE__
, __LINE__
,
4090 "LWP %ld is suspended, suspended=%d\n",
4091 lwpid_of (thread
), lwp
->suspended
);
4093 gdb_assert (lwp
->stopped
);
4095 /* Allow debugging the jump pad, gdb_collect, etc.. */
4096 return (supports_fast_tracepoints ()
4097 && agent_loaded_p ()
4098 && (gdb_breakpoint_here (lwp
->stop_pc
)
4099 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4100 || thread
->last_resume_kind
== resume_step
)
4101 && (linux_fast_tracepoint_collecting (lwp
, NULL
)
4102 != fast_tpoint_collect_result::not_collecting
));
4106 move_out_of_jump_pad_callback (thread_info
*thread
)
4108 struct thread_info
*saved_thread
;
4109 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4112 if (lwp
->suspended
!= 0)
4114 internal_error (__FILE__
, __LINE__
,
4115 "LWP %ld is suspended, suspended=%d\n",
4116 lwpid_of (thread
), lwp
->suspended
);
4118 gdb_assert (lwp
->stopped
);
4120 /* For gdb_breakpoint_here. */
4121 saved_thread
= current_thread
;
4122 current_thread
= thread
;
4124 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4126 /* Allow debugging the jump pad, gdb_collect, etc. */
4127 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4128 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4129 && thread
->last_resume_kind
!= resume_step
4130 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4133 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4138 lwp
->status_pending_p
= 0;
4139 enqueue_one_deferred_signal (lwp
, wstat
);
4142 debug_printf ("Signal %d for LWP %ld deferred "
4144 WSTOPSIG (*wstat
), lwpid_of (thread
));
4147 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4150 lwp_suspended_inc (lwp
);
4152 current_thread
= saved_thread
;
4156 lwp_running (thread_info
*thread
, void *data
)
4158 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4160 if (lwp_is_marked_dead (lwp
))
4167 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4168 If SUSPEND, then also increase the suspend count of every LWP,
4172 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4174 /* Should not be called recursively. */
4175 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4180 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4181 suspend
? "stop-and-suspend" : "stop",
4183 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4187 stopping_threads
= (suspend
4188 ? STOPPING_AND_SUSPENDING_THREADS
4189 : STOPPING_THREADS
);
4192 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
4194 find_inferior (&all_threads
, send_sigstop_callback
, except
);
4195 wait_for_sigstop ();
4196 stopping_threads
= NOT_STOPPING_THREADS
;
4200 debug_printf ("stop_all_lwps done, setting stopping_threads "
4201 "back to !stopping\n");
4206 /* Enqueue one signal in the chain of signals which need to be
4207 delivered to this process on next resume. */
4210 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4212 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4214 p_sig
->prev
= lwp
->pending_signals
;
4215 p_sig
->signal
= signal
;
4217 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4219 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4220 lwp
->pending_signals
= p_sig
;
4223 /* Install breakpoints for software single stepping. */
4226 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4228 struct thread_info
*thread
= get_lwp_thread (lwp
);
4229 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4230 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
4232 current_thread
= thread
;
4233 std::vector
<CORE_ADDR
> next_pcs
= the_low_target
.get_next_pcs (regcache
);
4235 for (CORE_ADDR pc
: next_pcs
)
4236 set_single_step_breakpoint (pc
, current_ptid
);
4238 do_cleanups (old_chain
);
4241 /* Single step via hardware or software single step.
4242 Return 1 if hardware single stepping, 0 if software single stepping
4243 or can't single step. */
4246 single_step (struct lwp_info
* lwp
)
4250 if (can_hardware_single_step ())
4254 else if (can_software_single_step ())
4256 install_software_single_step_breakpoints (lwp
);
4262 debug_printf ("stepping is not implemented on this target");
4268 /* The signal can be delivered to the inferior if we are not trying to
4269 finish a fast tracepoint collect. Since signal can be delivered in
4270 the step-over, the program may go to signal handler and trap again
4271 after return from the signal handler. We can live with the spurious
4275 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4277 return (lwp
->collecting_fast_tracepoint
4278 == fast_tpoint_collect_result::not_collecting
);
4281 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4282 SIGNAL is nonzero, give it that signal. */
4285 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4286 int step
, int signal
, siginfo_t
*info
)
4288 struct thread_info
*thread
= get_lwp_thread (lwp
);
4289 struct thread_info
*saved_thread
;
4291 struct process_info
*proc
= get_thread_process (thread
);
4293 /* Note that target description may not be initialised
4294 (proc->tdesc == NULL) at this point because the program hasn't
4295 stopped at the first instruction yet. It means GDBserver skips
4296 the extra traps from the wrapper program (see option --wrapper).
4297 Code in this function that requires register access should be
4298 guarded by proc->tdesc == NULL or something else. */
4300 if (lwp
->stopped
== 0)
4303 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4305 fast_tpoint_collect_result fast_tp_collecting
4306 = lwp
->collecting_fast_tracepoint
;
4308 gdb_assert (!stabilizing_threads
4309 || (fast_tp_collecting
4310 != fast_tpoint_collect_result::not_collecting
));
4312 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4313 user used the "jump" command, or "set $pc = foo"). */
4314 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4316 /* Collecting 'while-stepping' actions doesn't make sense
4318 release_while_stepping_state_list (thread
);
4321 /* If we have pending signals or status, and a new signal, enqueue the
4322 signal. Also enqueue the signal if it can't be delivered to the
4323 inferior right now. */
4325 && (lwp
->status_pending_p
4326 || lwp
->pending_signals
!= NULL
4327 || !lwp_signal_can_be_delivered (lwp
)))
4329 enqueue_pending_signal (lwp
, signal
, info
);
4331 /* Postpone any pending signal. It was enqueued above. */
4335 if (lwp
->status_pending_p
)
4338 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4339 " has pending status\n",
4340 lwpid_of (thread
), step
? "step" : "continue",
4341 lwp
->stop_expected
? "expected" : "not expected");
4345 saved_thread
= current_thread
;
4346 current_thread
= thread
;
4348 /* This bit needs some thinking about. If we get a signal that
4349 we must report while a single-step reinsert is still pending,
4350 we often end up resuming the thread. It might be better to
4351 (ew) allow a stack of pending events; then we could be sure that
4352 the reinsert happened right away and not lose any signals.
4354 Making this stack would also shrink the window in which breakpoints are
4355 uninserted (see comment in linux_wait_for_lwp) but not enough for
4356 complete correctness, so it won't solve that problem. It may be
4357 worthwhile just to solve this one, however. */
4358 if (lwp
->bp_reinsert
!= 0)
4361 debug_printf (" pending reinsert at 0x%s\n",
4362 paddress (lwp
->bp_reinsert
));
4364 if (can_hardware_single_step ())
4366 if (fast_tp_collecting
== fast_tpoint_collect_result::not_collecting
)
4369 warning ("BAD - reinserting but not stepping.");
4371 warning ("BAD - reinserting and suspended(%d).",
4376 step
= maybe_hw_step (thread
);
4379 if (fast_tp_collecting
== fast_tpoint_collect_result::before_insn
)
4382 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4383 " (exit-jump-pad-bkpt)\n",
4386 else if (fast_tp_collecting
== fast_tpoint_collect_result::at_insn
)
4389 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4390 " single-stepping\n",
4393 if (can_hardware_single_step ())
4397 internal_error (__FILE__
, __LINE__
,
4398 "moving out of jump pad single-stepping"
4399 " not implemented on this target");
4403 /* If we have while-stepping actions in this thread set it stepping.
4404 If we have a signal to deliver, it may or may not be set to
4405 SIG_IGN, we don't know. Assume so, and allow collecting
4406 while-stepping into a signal handler. A possible smart thing to
4407 do would be to set an internal breakpoint at the signal return
4408 address, continue, and carry on catching this while-stepping
4409 action only when that breakpoint is hit. A future
4411 if (thread
->while_stepping
!= NULL
)
4414 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4417 step
= single_step (lwp
);
4420 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4422 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4424 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4428 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4429 (long) lwp
->stop_pc
);
4433 /* If we have pending signals, consume one if it can be delivered to
4435 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4437 struct pending_signals
**p_sig
;
4439 p_sig
= &lwp
->pending_signals
;
4440 while ((*p_sig
)->prev
!= NULL
)
4441 p_sig
= &(*p_sig
)->prev
;
4443 signal
= (*p_sig
)->signal
;
4444 if ((*p_sig
)->info
.si_signo
!= 0)
4445 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4453 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4454 lwpid_of (thread
), step
? "step" : "continue", signal
,
4455 lwp
->stop_expected
? "expected" : "not expected");
4457 if (the_low_target
.prepare_to_resume
!= NULL
)
4458 the_low_target
.prepare_to_resume (lwp
);
4460 regcache_invalidate_thread (thread
);
4462 lwp
->stepping
= step
;
4464 ptrace_request
= PTRACE_SINGLESTEP
;
4465 else if (gdb_catching_syscalls_p (lwp
))
4466 ptrace_request
= PTRACE_SYSCALL
;
4468 ptrace_request
= PTRACE_CONT
;
4469 ptrace (ptrace_request
,
4471 (PTRACE_TYPE_ARG3
) 0,
4472 /* Coerce to a uintptr_t first to avoid potential gcc warning
4473 of coercing an 8 byte integer to a 4 byte pointer. */
4474 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4476 current_thread
= saved_thread
;
4478 perror_with_name ("resuming thread");
4480 /* Successfully resumed. Clear state that no longer makes sense,
4481 and mark the LWP as running. Must not do this before resuming
4482 otherwise if that fails other code will be confused. E.g., we'd
4483 later try to stop the LWP and hang forever waiting for a stop
4484 status. Note that we must not throw after this is cleared,
4485 otherwise handle_zombie_lwp_error would get confused. */
4487 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4490 /* Called when we try to resume a stopped LWP and that errors out. If
4491 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4492 or about to become), discard the error, clear any pending status
4493 the LWP may have, and return true (we'll collect the exit status
4494 soon enough). Otherwise, return false. */
4497 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4499 struct thread_info
*thread
= get_lwp_thread (lp
);
4501 /* If we get an error after resuming the LWP successfully, we'd
4502 confuse !T state for the LWP being gone. */
4503 gdb_assert (lp
->stopped
);
4505 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4506 because even if ptrace failed with ESRCH, the tracee may be "not
4507 yet fully dead", but already refusing ptrace requests. In that
4508 case the tracee has 'R (Running)' state for a little bit
4509 (observed in Linux 3.18). See also the note on ESRCH in the
4510 ptrace(2) man page. Instead, check whether the LWP has any state
4511 other than ptrace-stopped. */
4513 /* Don't assume anything if /proc/PID/status can't be read. */
4514 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4516 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4517 lp
->status_pending_p
= 0;
4523 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4524 disappears while we try to resume it. */
4527 linux_resume_one_lwp (struct lwp_info
*lwp
,
4528 int step
, int signal
, siginfo_t
*info
)
4532 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4534 CATCH (ex
, RETURN_MASK_ERROR
)
4536 if (!check_ptrace_stopped_lwp_gone (lwp
))
4537 throw_exception (ex
);
4542 /* This function is called once per thread via for_each_thread.
4543 We look up which resume request applies to THREAD and mark it with a
4544 pointer to the appropriate resume request.
4546 This algorithm is O(threads * resume elements), but resume elements
4547 is small (and will remain small at least until GDB supports thread
4551 linux_set_resume_request (thread_info
*thread
, thread_resume
*resume
, size_t n
)
4553 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4555 for (int ndx
= 0; ndx
< n
; ndx
++)
4557 ptid_t ptid
= resume
[ndx
].thread
;
4558 if (ptid_equal (ptid
, minus_one_ptid
)
4559 || ptid
== thread
->id
4560 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4562 || (ptid_get_pid (ptid
) == pid_of (thread
)
4563 && (ptid_is_pid (ptid
)
4564 || ptid_get_lwp (ptid
) == -1)))
4566 if (resume
[ndx
].kind
== resume_stop
4567 && thread
->last_resume_kind
== resume_stop
)
4570 debug_printf ("already %s LWP %ld at GDB's request\n",
4571 (thread
->last_status
.kind
4572 == TARGET_WAITKIND_STOPPED
)
4580 /* Ignore (wildcard) resume requests for already-resumed
4582 if (resume
[ndx
].kind
!= resume_stop
4583 && thread
->last_resume_kind
!= resume_stop
)
4586 debug_printf ("already %s LWP %ld at GDB's request\n",
4587 (thread
->last_resume_kind
4595 /* Don't let wildcard resumes resume fork children that GDB
4596 does not yet know are new fork children. */
4597 if (lwp
->fork_relative
!= NULL
)
4599 struct lwp_info
*rel
= lwp
->fork_relative
;
4601 if (rel
->status_pending_p
4602 && (rel
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
4603 || rel
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
))
4606 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4612 /* If the thread has a pending event that has already been
4613 reported to GDBserver core, but GDB has not pulled the
4614 event out of the vStopped queue yet, likewise, ignore the
4615 (wildcard) resume request. */
4616 if (in_queued_stop_replies (thread
->id
))
4619 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4624 lwp
->resume
= &resume
[ndx
];
4625 thread
->last_resume_kind
= lwp
->resume
->kind
;
4627 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4628 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4630 /* If we had a deferred signal to report, dequeue one now.
4631 This can happen if LWP gets more than one signal while
4632 trying to get out of a jump pad. */
4634 && !lwp
->status_pending_p
4635 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4637 lwp
->status_pending_p
= 1;
4640 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4641 "leaving status pending.\n",
4642 WSTOPSIG (lwp
->status_pending
),
4650 /* No resume action for this thread. */
4654 /* find_inferior callback for linux_resume.
4655 Set *FLAG_P if this lwp has an interesting status pending. */
4658 resume_status_pending_p (thread_info
*thread
)
4660 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4662 /* LWPs which will not be resumed are not interesting, because
4663 we might not wait for them next time through linux_wait. */
4664 if (lwp
->resume
== NULL
)
4667 return thread_still_has_status_pending_p (thread
);
4670 /* Return 1 if this lwp that GDB wants running is stopped at an
4671 internal breakpoint that we need to step over. It assumes that any
4672 required STOP_PC adjustment has already been propagated to the
4673 inferior's regcache. */
4676 need_step_over_p (thread_info
*thread
)
4678 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4679 struct thread_info
*saved_thread
;
4681 struct process_info
*proc
= get_thread_process (thread
);
4683 /* GDBserver is skipping the extra traps from the wrapper program,
4684 don't have to do step over. */
4685 if (proc
->tdesc
== NULL
)
4688 /* LWPs which will not be resumed are not interesting, because we
4689 might not wait for them next time through linux_wait. */
4694 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4699 if (thread
->last_resume_kind
== resume_stop
)
4702 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4708 gdb_assert (lwp
->suspended
>= 0);
4713 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4718 if (lwp
->status_pending_p
)
4721 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4727 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4731 /* If the PC has changed since we stopped, then don't do anything,
4732 and let the breakpoint/tracepoint be hit. This happens if, for
4733 instance, GDB handled the decr_pc_after_break subtraction itself,
4734 GDB is OOL stepping this thread, or the user has issued a "jump"
4735 command, or poked thread's registers herself. */
4736 if (pc
!= lwp
->stop_pc
)
4739 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4740 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4742 paddress (lwp
->stop_pc
), paddress (pc
));
4746 /* On software single step target, resume the inferior with signal
4747 rather than stepping over. */
4748 if (can_software_single_step ()
4749 && lwp
->pending_signals
!= NULL
4750 && lwp_signal_can_be_delivered (lwp
))
4753 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4760 saved_thread
= current_thread
;
4761 current_thread
= thread
;
4763 /* We can only step over breakpoints we know about. */
4764 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4766 /* Don't step over a breakpoint that GDB expects to hit
4767 though. If the condition is being evaluated on the target's side
4768 and it evaluate to false, step over this breakpoint as well. */
4769 if (gdb_breakpoint_here (pc
)
4770 && gdb_condition_true_at_breakpoint (pc
)
4771 && gdb_no_commands_at_breakpoint (pc
))
4774 debug_printf ("Need step over [LWP %ld]? yes, but found"
4775 " GDB breakpoint at 0x%s; skipping step over\n",
4776 lwpid_of (thread
), paddress (pc
));
4778 current_thread
= saved_thread
;
4784 debug_printf ("Need step over [LWP %ld]? yes, "
4785 "found breakpoint at 0x%s\n",
4786 lwpid_of (thread
), paddress (pc
));
4788 /* We've found an lwp that needs stepping over --- return 1 so
4789 that find_inferior stops looking. */
4790 current_thread
= saved_thread
;
4796 current_thread
= saved_thread
;
4799 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4801 lwpid_of (thread
), paddress (pc
));
4806 /* Start a step-over operation on LWP. When LWP stopped at a
4807 breakpoint, to make progress, we need to remove the breakpoint out
4808 of the way. If we let other threads run while we do that, they may
4809 pass by the breakpoint location and miss hitting it. To avoid
4810 that, a step-over momentarily stops all threads while LWP is
4811 single-stepped by either hardware or software while the breakpoint
4812 is temporarily uninserted from the inferior. When the single-step
4813 finishes, we reinsert the breakpoint, and let all threads that are
4814 supposed to be running, run again. */
4817 start_step_over (struct lwp_info
*lwp
)
4819 struct thread_info
*thread
= get_lwp_thread (lwp
);
4820 struct thread_info
*saved_thread
;
4825 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4828 stop_all_lwps (1, lwp
);
4830 if (lwp
->suspended
!= 0)
4832 internal_error (__FILE__
, __LINE__
,
4833 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4838 debug_printf ("Done stopping all threads for step-over.\n");
4840 /* Note, we should always reach here with an already adjusted PC,
4841 either by GDB (if we're resuming due to GDB's request), or by our
4842 caller, if we just finished handling an internal breakpoint GDB
4843 shouldn't care about. */
4846 saved_thread
= current_thread
;
4847 current_thread
= thread
;
4849 lwp
->bp_reinsert
= pc
;
4850 uninsert_breakpoints_at (pc
);
4851 uninsert_fast_tracepoint_jumps_at (pc
);
4853 step
= single_step (lwp
);
4855 current_thread
= saved_thread
;
4857 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4859 /* Require next event from this LWP. */
4860 step_over_bkpt
= thread
->id
;
4864 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4865 start_step_over, if still there, and delete any single-step
4866 breakpoints we've set, on non hardware single-step targets. */
4869 finish_step_over (struct lwp_info
*lwp
)
4871 if (lwp
->bp_reinsert
!= 0)
4873 struct thread_info
*saved_thread
= current_thread
;
4876 debug_printf ("Finished step over.\n");
4878 current_thread
= get_lwp_thread (lwp
);
4880 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4881 may be no breakpoint to reinsert there by now. */
4882 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4883 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4885 lwp
->bp_reinsert
= 0;
4887 /* Delete any single-step breakpoints. No longer needed. We
4888 don't have to worry about other threads hitting this trap,
4889 and later not being able to explain it, because we were
4890 stepping over a breakpoint, and we hold all threads but
4891 LWP stopped while doing that. */
4892 if (!can_hardware_single_step ())
4894 gdb_assert (has_single_step_breakpoints (current_thread
));
4895 delete_single_step_breakpoints (current_thread
);
4898 step_over_bkpt
= null_ptid
;
4899 current_thread
= saved_thread
;
4906 /* If there's a step over in progress, wait until all threads stop
4907 (that is, until the stepping thread finishes its step), and
4908 unsuspend all lwps. The stepping thread ends with its status
4909 pending, which is processed later when we get back to processing
4913 complete_ongoing_step_over (void)
4915 if (!ptid_equal (step_over_bkpt
, null_ptid
))
4917 struct lwp_info
*lwp
;
4922 debug_printf ("detach: step over in progress, finish it first\n");
4924 /* Passing NULL_PTID as filter indicates we want all events to
4925 be left pending. Eventually this returns when there are no
4926 unwaited-for children left. */
4927 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4929 gdb_assert (ret
== -1);
4931 lwp
= find_lwp_pid (step_over_bkpt
);
4933 finish_step_over (lwp
);
4934 step_over_bkpt
= null_ptid
;
4935 unsuspend_all_lwps (lwp
);
4939 /* This function is called once per thread. We check the thread's resume
4940 request, which will tell us whether to resume, step, or leave the thread
4941 stopped; and what signal, if any, it should be sent.
4943 For threads which we aren't explicitly told otherwise, we preserve
4944 the stepping flag; this is used for stepping over gdbserver-placed
4947 If pending_flags was set in any thread, we queue any needed
4948 signals, since we won't actually resume. We already have a pending
4949 event to report, so we don't need to preserve any step requests;
4950 they should be re-issued if necessary. */
4953 linux_resume_one_thread (thread_info
*thread
, void *arg
)
4955 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4956 int leave_all_stopped
= * (int *) arg
;
4959 if (lwp
->resume
== NULL
)
4962 if (lwp
->resume
->kind
== resume_stop
)
4965 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4970 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
4972 /* Stop the thread, and wait for the event asynchronously,
4973 through the event loop. */
4979 debug_printf ("already stopped LWP %ld\n",
4982 /* The LWP may have been stopped in an internal event that
4983 was not meant to be notified back to GDB (e.g., gdbserver
4984 breakpoint), so we should be reporting a stop event in
4987 /* If the thread already has a pending SIGSTOP, this is a
4988 no-op. Otherwise, something later will presumably resume
4989 the thread and this will cause it to cancel any pending
4990 operation, due to last_resume_kind == resume_stop. If
4991 the thread already has a pending status to report, we
4992 will still report it the next time we wait - see
4993 status_pending_p_callback. */
4995 /* If we already have a pending signal to report, then
4996 there's no need to queue a SIGSTOP, as this means we're
4997 midway through moving the LWP out of the jumppad, and we
4998 will report the pending signal as soon as that is
5000 if (lwp
->pending_signals_to_report
== NULL
)
5004 /* For stop requests, we're done. */
5006 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5010 /* If this thread which is about to be resumed has a pending status,
5011 then don't resume it - we can just report the pending status.
5012 Likewise if it is suspended, because e.g., another thread is
5013 stepping past a breakpoint. Make sure to queue any signals that
5014 would otherwise be sent. In all-stop mode, we do this decision
5015 based on if *any* thread has a pending status. If there's a
5016 thread that needs the step-over-breakpoint dance, then don't
5017 resume any other thread but that particular one. */
5018 leave_pending
= (lwp
->suspended
5019 || lwp
->status_pending_p
5020 || leave_all_stopped
);
5022 /* If we have a new signal, enqueue the signal. */
5023 if (lwp
->resume
->sig
!= 0)
5025 siginfo_t info
, *info_p
;
5027 /* If this is the same signal we were previously stopped by,
5028 make sure to queue its siginfo. */
5029 if (WIFSTOPPED (lwp
->last_status
)
5030 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
5031 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
5032 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
5037 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
5043 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
5045 proceed_one_lwp (thread
, NULL
);
5050 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5053 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5059 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5061 struct thread_info
*need_step_over
= NULL
;
5062 int leave_all_stopped
;
5067 debug_printf ("linux_resume:\n");
5070 for_each_thread ([&] (thread_info
*thread
)
5072 linux_set_resume_request (thread
, resume_info
, n
);
5075 /* If there is a thread which would otherwise be resumed, which has
5076 a pending status, then don't resume any threads - we can just
5077 report the pending status. Make sure to queue any signals that
5078 would otherwise be sent. In non-stop mode, we'll apply this
5079 logic to each thread individually. We consume all pending events
5080 before considering to start a step-over (in all-stop). */
5081 bool any_pending
= false;
5083 any_pending
= find_thread (resume_status_pending_p
) != NULL
;
5085 /* If there is a thread which would otherwise be resumed, which is
5086 stopped at a breakpoint that needs stepping over, then don't
5087 resume any threads - have it step over the breakpoint with all
5088 other threads stopped, then resume all threads again. Make sure
5089 to queue any signals that would otherwise be delivered or
5091 if (!any_pending
&& supports_breakpoints ())
5092 need_step_over
= find_thread (need_step_over_p
);
5094 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5098 if (need_step_over
!= NULL
)
5099 debug_printf ("Not resuming all, need step over\n");
5100 else if (any_pending
)
5101 debug_printf ("Not resuming, all-stop and found "
5102 "an LWP with pending status\n");
5104 debug_printf ("Resuming, no pending status or step over needed\n");
5107 /* Even if we're leaving threads stopped, queue all signals we'd
5108 otherwise deliver. */
5109 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
5112 start_step_over (get_thread_lwp (need_step_over
));
5116 debug_printf ("linux_resume done\n");
5120 /* We may have events that were pending that can/should be sent to
5121 the client now. Trigger a linux_wait call. */
5122 if (target_is_async_p ())
5126 /* This function is called once per thread. We check the thread's
5127 last resume request, which will tell us whether to resume, step, or
5128 leave the thread stopped. Any signal the client requested to be
5129 delivered has already been enqueued at this point.
5131 If any thread that GDB wants running is stopped at an internal
5132 breakpoint that needs stepping over, we start a step-over operation
5133 on that particular thread, and leave all others stopped. */
5136 proceed_one_lwp (thread_info
*thread
, void *except
)
5138 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5145 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5150 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5154 if (thread
->last_resume_kind
== resume_stop
5155 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5158 debug_printf (" client wants LWP to remain %ld stopped\n",
5163 if (lwp
->status_pending_p
)
5166 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5171 gdb_assert (lwp
->suspended
>= 0);
5176 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5180 if (thread
->last_resume_kind
== resume_stop
5181 && lwp
->pending_signals_to_report
== NULL
5182 && (lwp
->collecting_fast_tracepoint
5183 == fast_tpoint_collect_result::not_collecting
))
5185 /* We haven't reported this LWP as stopped yet (otherwise, the
5186 last_status.kind check above would catch it, and we wouldn't
5187 reach here. This LWP may have been momentarily paused by a
5188 stop_all_lwps call while handling for example, another LWP's
5189 step-over. In that case, the pending expected SIGSTOP signal
5190 that was queued at vCont;t handling time will have already
5191 been consumed by wait_for_sigstop, and so we need to requeue
5192 another one here. Note that if the LWP already has a SIGSTOP
5193 pending, this is a no-op. */
5196 debug_printf ("Client wants LWP %ld to stop. "
5197 "Making sure it has a SIGSTOP pending\n",
5203 if (thread
->last_resume_kind
== resume_step
)
5206 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5209 /* If resume_step is requested by GDB, install single-step
5210 breakpoints when the thread is about to be actually resumed if
5211 the single-step breakpoints weren't removed. */
5212 if (can_software_single_step ()
5213 && !has_single_step_breakpoints (thread
))
5214 install_software_single_step_breakpoints (lwp
);
5216 step
= maybe_hw_step (thread
);
5218 else if (lwp
->bp_reinsert
!= 0)
5221 debug_printf (" stepping LWP %ld, reinsert set\n",
5224 step
= maybe_hw_step (thread
);
5229 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5234 unsuspend_and_proceed_one_lwp (thread_info
*thread
, void *except
)
5236 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5241 lwp_suspended_decr (lwp
);
5243 return proceed_one_lwp (thread
, except
);
5246 /* When we finish a step-over, set threads running again. If there's
5247 another thread that may need a step-over, now's the time to start
5248 it. Eventually, we'll move all threads past their breakpoints. */
5251 proceed_all_lwps (void)
5253 struct thread_info
*need_step_over
;
5255 /* If there is a thread which would otherwise be resumed, which is
5256 stopped at a breakpoint that needs stepping over, then don't
5257 resume any threads - have it step over the breakpoint with all
5258 other threads stopped, then resume all threads again. */
5260 if (supports_breakpoints ())
5262 need_step_over
= find_thread (need_step_over_p
);
5264 if (need_step_over
!= NULL
)
5267 debug_printf ("proceed_all_lwps: found "
5268 "thread %ld needing a step-over\n",
5269 lwpid_of (need_step_over
));
5271 start_step_over (get_thread_lwp (need_step_over
));
5277 debug_printf ("Proceeding, no step-over needed\n");
5279 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
5282 /* Stopped LWPs that the client wanted to be running, that don't have
5283 pending statuses, are set to run again, except for EXCEPT, if not
5284 NULL. This undoes a stop_all_lwps call. */
5287 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5293 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5294 lwpid_of (get_lwp_thread (except
)));
5296 debug_printf ("unstopping all lwps\n");
5300 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
5302 find_inferior (&all_threads
, proceed_one_lwp
, except
);
5306 debug_printf ("unstop_all_lwps done\n");
5312 #ifdef HAVE_LINUX_REGSETS
5314 #define use_linux_regsets 1
5316 /* Returns true if REGSET has been disabled. */
5319 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5321 return (info
->disabled_regsets
!= NULL
5322 && info
->disabled_regsets
[regset
- info
->regsets
]);
5325 /* Disable REGSET. */
5328 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5332 dr_offset
= regset
- info
->regsets
;
5333 if (info
->disabled_regsets
== NULL
)
5334 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5335 info
->disabled_regsets
[dr_offset
] = 1;
5339 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5340 struct regcache
*regcache
)
5342 struct regset_info
*regset
;
5343 int saw_general_regs
= 0;
5347 pid
= lwpid_of (current_thread
);
5348 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5353 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5356 buf
= xmalloc (regset
->size
);
5358 nt_type
= regset
->nt_type
;
5362 iov
.iov_len
= regset
->size
;
5363 data
= (void *) &iov
;
5369 res
= ptrace (regset
->get_request
, pid
,
5370 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5372 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5378 /* If we get EIO on a regset, do not try it again for
5379 this process mode. */
5380 disable_regset (regsets_info
, regset
);
5382 else if (errno
== ENODATA
)
5384 /* ENODATA may be returned if the regset is currently
5385 not "active". This can happen in normal operation,
5386 so suppress the warning in this case. */
5388 else if (errno
== ESRCH
)
5390 /* At this point, ESRCH should mean the process is
5391 already gone, in which case we simply ignore attempts
5392 to read its registers. */
5397 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5404 if (regset
->type
== GENERAL_REGS
)
5405 saw_general_regs
= 1;
5406 regset
->store_function (regcache
, buf
);
5410 if (saw_general_regs
)
5417 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5418 struct regcache
*regcache
)
5420 struct regset_info
*regset
;
5421 int saw_general_regs
= 0;
5425 pid
= lwpid_of (current_thread
);
5426 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5431 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5432 || regset
->fill_function
== NULL
)
5435 buf
= xmalloc (regset
->size
);
5437 /* First fill the buffer with the current register set contents,
5438 in case there are any items in the kernel's regset that are
5439 not in gdbserver's regcache. */
5441 nt_type
= regset
->nt_type
;
5445 iov
.iov_len
= regset
->size
;
5446 data
= (void *) &iov
;
5452 res
= ptrace (regset
->get_request
, pid
,
5453 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5455 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5460 /* Then overlay our cached registers on that. */
5461 regset
->fill_function (regcache
, buf
);
5463 /* Only now do we write the register set. */
5465 res
= ptrace (regset
->set_request
, pid
,
5466 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5468 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5476 /* If we get EIO on a regset, do not try it again for
5477 this process mode. */
5478 disable_regset (regsets_info
, regset
);
5480 else if (errno
== ESRCH
)
5482 /* At this point, ESRCH should mean the process is
5483 already gone, in which case we simply ignore attempts
5484 to change its registers. See also the related
5485 comment in linux_resume_one_lwp. */
5491 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5494 else if (regset
->type
== GENERAL_REGS
)
5495 saw_general_regs
= 1;
5498 if (saw_general_regs
)
5504 #else /* !HAVE_LINUX_REGSETS */
5506 #define use_linux_regsets 0
5507 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5508 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5512 /* Return 1 if register REGNO is supported by one of the regset ptrace
5513 calls or 0 if it has to be transferred individually. */
5516 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5518 unsigned char mask
= 1 << (regno
% 8);
5519 size_t index
= regno
/ 8;
5521 return (use_linux_regsets
5522 && (regs_info
->regset_bitmap
== NULL
5523 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5526 #ifdef HAVE_LINUX_USRREGS
5529 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5533 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5534 error ("Invalid register number %d.", regnum
);
5536 addr
= usrregs
->regmap
[regnum
];
5541 /* Fetch one register. */
5543 fetch_register (const struct usrregs_info
*usrregs
,
5544 struct regcache
*regcache
, int regno
)
5551 if (regno
>= usrregs
->num_regs
)
5553 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5556 regaddr
= register_addr (usrregs
, regno
);
5560 size
= ((register_size (regcache
->tdesc
, regno
)
5561 + sizeof (PTRACE_XFER_TYPE
) - 1)
5562 & -sizeof (PTRACE_XFER_TYPE
));
5563 buf
= (char *) alloca (size
);
5565 pid
= lwpid_of (current_thread
);
5566 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5569 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5570 ptrace (PTRACE_PEEKUSER
, pid
,
5571 /* Coerce to a uintptr_t first to avoid potential gcc warning
5572 of coercing an 8 byte integer to a 4 byte pointer. */
5573 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5574 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5576 error ("reading register %d: %s", regno
, strerror (errno
));
5579 if (the_low_target
.supply_ptrace_register
)
5580 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5582 supply_register (regcache
, regno
, buf
);
5585 /* Store one register. */
5587 store_register (const struct usrregs_info
*usrregs
,
5588 struct regcache
*regcache
, int regno
)
5595 if (regno
>= usrregs
->num_regs
)
5597 if ((*the_low_target
.cannot_store_register
) (regno
))
5600 regaddr
= register_addr (usrregs
, regno
);
5604 size
= ((register_size (regcache
->tdesc
, regno
)
5605 + sizeof (PTRACE_XFER_TYPE
) - 1)
5606 & -sizeof (PTRACE_XFER_TYPE
));
5607 buf
= (char *) alloca (size
);
5608 memset (buf
, 0, size
);
5610 if (the_low_target
.collect_ptrace_register
)
5611 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5613 collect_register (regcache
, regno
, buf
);
5615 pid
= lwpid_of (current_thread
);
5616 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5619 ptrace (PTRACE_POKEUSER
, pid
,
5620 /* Coerce to a uintptr_t first to avoid potential gcc warning
5621 about coercing an 8 byte integer to a 4 byte pointer. */
5622 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5623 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5626 /* At this point, ESRCH should mean the process is
5627 already gone, in which case we simply ignore attempts
5628 to change its registers. See also the related
5629 comment in linux_resume_one_lwp. */
5633 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5634 error ("writing register %d: %s", regno
, strerror (errno
));
5636 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5640 /* Fetch all registers, or just one, from the child process.
5641 If REGNO is -1, do this for all registers, skipping any that are
5642 assumed to have been retrieved by regsets_fetch_inferior_registers,
5643 unless ALL is non-zero.
5644 Otherwise, REGNO specifies which register (so we can save time). */
5646 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5647 struct regcache
*regcache
, int regno
, int all
)
5649 struct usrregs_info
*usr
= regs_info
->usrregs
;
5653 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5654 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5655 fetch_register (usr
, regcache
, regno
);
5658 fetch_register (usr
, regcache
, regno
);
5661 /* Store our register values back into the inferior.
5662 If REGNO is -1, do this for all registers, skipping any that are
5663 assumed to have been saved by regsets_store_inferior_registers,
5664 unless ALL is non-zero.
5665 Otherwise, REGNO specifies which register (so we can save time). */
5667 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5668 struct regcache
*regcache
, int regno
, int all
)
5670 struct usrregs_info
*usr
= regs_info
->usrregs
;
5674 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5675 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5676 store_register (usr
, regcache
, regno
);
5679 store_register (usr
, regcache
, regno
);
5682 #else /* !HAVE_LINUX_USRREGS */
5684 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5685 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5691 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5695 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5699 if (the_low_target
.fetch_register
!= NULL
5700 && regs_info
->usrregs
!= NULL
)
5701 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5702 (*the_low_target
.fetch_register
) (regcache
, regno
);
5704 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5705 if (regs_info
->usrregs
!= NULL
)
5706 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5710 if (the_low_target
.fetch_register
!= NULL
5711 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5714 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5716 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5718 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5719 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5724 linux_store_registers (struct regcache
*regcache
, int regno
)
5728 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5732 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5734 if (regs_info
->usrregs
!= NULL
)
5735 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5739 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5741 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5743 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5744 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5749 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5750 to debugger memory starting at MYADDR. */
5753 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5755 int pid
= lwpid_of (current_thread
);
5756 PTRACE_XFER_TYPE
*buffer
;
5764 /* Try using /proc. Don't bother for one word. */
5765 if (len
>= 3 * sizeof (long))
5769 /* We could keep this file open and cache it - possibly one per
5770 thread. That requires some juggling, but is even faster. */
5771 sprintf (filename
, "/proc/%d/mem", pid
);
5772 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5776 /* If pread64 is available, use it. It's faster if the kernel
5777 supports it (only one syscall), and it's 64-bit safe even on
5778 32-bit platforms (for instance, SPARC debugging a SPARC64
5781 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5784 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5785 bytes
= read (fd
, myaddr
, len
);
5792 /* Some data was read, we'll try to get the rest with ptrace. */
5802 /* Round starting address down to longword boundary. */
5803 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5804 /* Round ending address up; get number of longwords that makes. */
5805 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5806 / sizeof (PTRACE_XFER_TYPE
));
5807 /* Allocate buffer of that many longwords. */
5808 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5810 /* Read all the longwords */
5812 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5814 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5815 about coercing an 8 byte integer to a 4 byte pointer. */
5816 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5817 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5818 (PTRACE_TYPE_ARG4
) 0);
5824 /* Copy appropriate bytes out of the buffer. */
5827 i
*= sizeof (PTRACE_XFER_TYPE
);
5828 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5830 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5837 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5838 memory at MEMADDR. On failure (cannot write to the inferior)
5839 returns the value of errno. Always succeeds if LEN is zero. */
5842 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5845 /* Round starting address down to longword boundary. */
5846 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5847 /* Round ending address up; get number of longwords that makes. */
5849 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5850 / sizeof (PTRACE_XFER_TYPE
);
5852 /* Allocate buffer of that many longwords. */
5853 PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5855 int pid
= lwpid_of (current_thread
);
5859 /* Zero length write always succeeds. */
5865 /* Dump up to four bytes. */
5866 char str
[4 * 2 + 1];
5868 int dump
= len
< 4 ? len
: 4;
5870 for (i
= 0; i
< dump
; i
++)
5872 sprintf (p
, "%02x", myaddr
[i
]);
5877 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5878 str
, (long) memaddr
, pid
);
5881 /* Fill start and end extra bytes of buffer with existing memory data. */
5884 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5885 about coercing an 8 byte integer to a 4 byte pointer. */
5886 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5887 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5888 (PTRACE_TYPE_ARG4
) 0);
5896 = ptrace (PTRACE_PEEKTEXT
, pid
,
5897 /* Coerce to a uintptr_t first to avoid potential gcc warning
5898 about coercing an 8 byte integer to a 4 byte pointer. */
5899 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5900 * sizeof (PTRACE_XFER_TYPE
)),
5901 (PTRACE_TYPE_ARG4
) 0);
5906 /* Copy data to be written over corresponding part of buffer. */
5908 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5911 /* Write the entire buffer. */
5913 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5916 ptrace (PTRACE_POKETEXT
, pid
,
5917 /* Coerce to a uintptr_t first to avoid potential gcc warning
5918 about coercing an 8 byte integer to a 4 byte pointer. */
5919 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5920 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5929 linux_look_up_symbols (void)
5931 #ifdef USE_THREAD_DB
5932 struct process_info
*proc
= current_process ();
5934 if (proc
->priv
->thread_db
!= NULL
)
5942 linux_request_interrupt (void)
5944 /* Send a SIGINT to the process group. This acts just like the user
5945 typed a ^C on the controlling terminal. */
5946 kill (-signal_pid
, SIGINT
);
5949 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5950 to debugger memory starting at MYADDR. */
5953 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5955 char filename
[PATH_MAX
];
5957 int pid
= lwpid_of (current_thread
);
5959 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5961 fd
= open (filename
, O_RDONLY
);
5965 if (offset
!= (CORE_ADDR
) 0
5966 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5969 n
= read (fd
, myaddr
, len
);
5976 /* These breakpoint and watchpoint related wrapper functions simply
5977 pass on the function call if the target has registered a
5978 corresponding function. */
5981 linux_supports_z_point_type (char z_type
)
5983 return (the_low_target
.supports_z_point_type
!= NULL
5984 && the_low_target
.supports_z_point_type (z_type
));
5988 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5989 int size
, struct raw_breakpoint
*bp
)
5991 if (type
== raw_bkpt_type_sw
)
5992 return insert_memory_breakpoint (bp
);
5993 else if (the_low_target
.insert_point
!= NULL
)
5994 return the_low_target
.insert_point (type
, addr
, size
, bp
);
5996 /* Unsupported (see target.h). */
6001 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6002 int size
, struct raw_breakpoint
*bp
)
6004 if (type
== raw_bkpt_type_sw
)
6005 return remove_memory_breakpoint (bp
);
6006 else if (the_low_target
.remove_point
!= NULL
)
6007 return the_low_target
.remove_point (type
, addr
, size
, bp
);
6009 /* Unsupported (see target.h). */
6013 /* Implement the to_stopped_by_sw_breakpoint target_ops
6017 linux_stopped_by_sw_breakpoint (void)
6019 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6021 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
6024 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
6028 linux_supports_stopped_by_sw_breakpoint (void)
6030 return USE_SIGTRAP_SIGINFO
;
6033 /* Implement the to_stopped_by_hw_breakpoint target_ops
6037 linux_stopped_by_hw_breakpoint (void)
6039 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6041 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6044 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6048 linux_supports_stopped_by_hw_breakpoint (void)
6050 return USE_SIGTRAP_SIGINFO
;
6053 /* Implement the supports_hardware_single_step target_ops method. */
6056 linux_supports_hardware_single_step (void)
6058 return can_hardware_single_step ();
6062 linux_supports_software_single_step (void)
6064 return can_software_single_step ();
6068 linux_stopped_by_watchpoint (void)
6070 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6072 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6076 linux_stopped_data_address (void)
6078 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6080 return lwp
->stopped_data_address
;
6083 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6084 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6085 && defined(PT_TEXT_END_ADDR)
6087 /* This is only used for targets that define PT_TEXT_ADDR,
6088 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6089 the target has different ways of acquiring this information, like
6092 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6093 to tell gdb about. */
6096 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6098 unsigned long text
, text_end
, data
;
6099 int pid
= lwpid_of (current_thread
);
6103 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6104 (PTRACE_TYPE_ARG4
) 0);
6105 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6106 (PTRACE_TYPE_ARG4
) 0);
6107 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6108 (PTRACE_TYPE_ARG4
) 0);
6112 /* Both text and data offsets produced at compile-time (and so
6113 used by gdb) are relative to the beginning of the program,
6114 with the data segment immediately following the text segment.
6115 However, the actual runtime layout in memory may put the data
6116 somewhere else, so when we send gdb a data base-address, we
6117 use the real data base address and subtract the compile-time
6118 data base-address from it (which is just the length of the
6119 text segment). BSS immediately follows data in both
6122 *data_p
= data
- (text_end
- text
);
6131 linux_qxfer_osdata (const char *annex
,
6132 unsigned char *readbuf
, unsigned const char *writebuf
,
6133 CORE_ADDR offset
, int len
)
6135 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6138 /* Convert a native/host siginfo object, into/from the siginfo in the
6139 layout of the inferiors' architecture. */
6142 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6146 if (the_low_target
.siginfo_fixup
!= NULL
)
6147 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6149 /* If there was no callback, or the callback didn't do anything,
6150 then just do a straight memcpy. */
6154 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6156 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6161 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6162 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6166 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6168 if (current_thread
== NULL
)
6171 pid
= lwpid_of (current_thread
);
6174 debug_printf ("%s siginfo for lwp %d.\n",
6175 readbuf
!= NULL
? "Reading" : "Writing",
6178 if (offset
>= sizeof (siginfo
))
6181 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6184 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6185 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6186 inferior with a 64-bit GDBSERVER should look the same as debugging it
6187 with a 32-bit GDBSERVER, we need to convert it. */
6188 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6190 if (offset
+ len
> sizeof (siginfo
))
6191 len
= sizeof (siginfo
) - offset
;
6193 if (readbuf
!= NULL
)
6194 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6197 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6199 /* Convert back to ptrace layout before flushing it out. */
6200 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6202 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6209 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6210 so we notice when children change state; as the handler for the
6211 sigsuspend in my_waitpid. */
6214 sigchld_handler (int signo
)
6216 int old_errno
= errno
;
6222 /* fprintf is not async-signal-safe, so call write
6224 if (write (2, "sigchld_handler\n",
6225 sizeof ("sigchld_handler\n") - 1) < 0)
6226 break; /* just ignore */
6230 if (target_is_async_p ())
6231 async_file_mark (); /* trigger a linux_wait */
6237 linux_supports_non_stop (void)
6243 linux_async (int enable
)
6245 int previous
= target_is_async_p ();
6248 debug_printf ("linux_async (%d), previous=%d\n",
6251 if (previous
!= enable
)
6254 sigemptyset (&mask
);
6255 sigaddset (&mask
, SIGCHLD
);
6257 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6261 if (pipe (linux_event_pipe
) == -1)
6263 linux_event_pipe
[0] = -1;
6264 linux_event_pipe
[1] = -1;
6265 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6267 warning ("creating event pipe failed.");
6271 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6272 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6274 /* Register the event loop handler. */
6275 add_file_handler (linux_event_pipe
[0],
6276 handle_target_event
, NULL
);
6278 /* Always trigger a linux_wait. */
6283 delete_file_handler (linux_event_pipe
[0]);
6285 close (linux_event_pipe
[0]);
6286 close (linux_event_pipe
[1]);
6287 linux_event_pipe
[0] = -1;
6288 linux_event_pipe
[1] = -1;
6291 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6298 linux_start_non_stop (int nonstop
)
6300 /* Register or unregister from event-loop accordingly. */
6301 linux_async (nonstop
);
6303 if (target_is_async_p () != (nonstop
!= 0))
6310 linux_supports_multi_process (void)
6315 /* Check if fork events are supported. */
6318 linux_supports_fork_events (void)
6320 return linux_supports_tracefork ();
6323 /* Check if vfork events are supported. */
6326 linux_supports_vfork_events (void)
6328 return linux_supports_tracefork ();
6331 /* Check if exec events are supported. */
6334 linux_supports_exec_events (void)
6336 return linux_supports_traceexec ();
6339 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6340 ptrace flags for all inferiors. This is in case the new GDB connection
6341 doesn't support the same set of events that the previous one did. */
6344 linux_handle_new_gdb_connection (void)
6346 /* Request that all the lwps reset their ptrace options. */
6347 for_each_thread ([] (thread_info
*thread
)
6349 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6353 /* Stop the lwp so we can modify its ptrace options. */
6354 lwp
->must_set_ptrace_flags
= 1;
6355 linux_stop_lwp (lwp
);
6359 /* Already stopped; go ahead and set the ptrace options. */
6360 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6361 int options
= linux_low_ptrace_options (proc
->attached
);
6363 linux_enable_event_reporting (lwpid_of (thread
), options
);
6364 lwp
->must_set_ptrace_flags
= 0;
6370 linux_supports_disable_randomization (void)
6372 #ifdef HAVE_PERSONALITY
6380 linux_supports_agent (void)
6386 linux_supports_range_stepping (void)
6388 if (can_software_single_step ())
6390 if (*the_low_target
.supports_range_stepping
== NULL
)
6393 return (*the_low_target
.supports_range_stepping
) ();
6396 /* Enumerate spufs IDs for process PID. */
6398 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6404 struct dirent
*entry
;
6406 sprintf (path
, "/proc/%ld/fd", pid
);
6407 dir
= opendir (path
);
6412 while ((entry
= readdir (dir
)) != NULL
)
6418 fd
= atoi (entry
->d_name
);
6422 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6423 if (stat (path
, &st
) != 0)
6425 if (!S_ISDIR (st
.st_mode
))
6428 if (statfs (path
, &stfs
) != 0)
6430 if (stfs
.f_type
!= SPUFS_MAGIC
)
6433 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6435 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6445 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6446 object type, using the /proc file system. */
6448 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6449 unsigned const char *writebuf
,
6450 CORE_ADDR offset
, int len
)
6452 long pid
= lwpid_of (current_thread
);
6457 if (!writebuf
&& !readbuf
)
6465 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6468 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6469 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6474 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6481 ret
= write (fd
, writebuf
, (size_t) len
);
6483 ret
= read (fd
, readbuf
, (size_t) len
);
6489 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6490 struct target_loadseg
6492 /* Core address to which the segment is mapped. */
6494 /* VMA recorded in the program header. */
6496 /* Size of this segment in memory. */
6500 # if defined PT_GETDSBT
6501 struct target_loadmap
6503 /* Protocol version number, must be zero. */
6505 /* Pointer to the DSBT table, its size, and the DSBT index. */
6506 unsigned *dsbt_table
;
6507 unsigned dsbt_size
, dsbt_index
;
6508 /* Number of segments in this map. */
6510 /* The actual memory map. */
6511 struct target_loadseg segs
[/*nsegs*/];
6513 # define LINUX_LOADMAP PT_GETDSBT
6514 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6515 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6517 struct target_loadmap
6519 /* Protocol version number, must be zero. */
6521 /* Number of segments in this map. */
6523 /* The actual memory map. */
6524 struct target_loadseg segs
[/*nsegs*/];
6526 # define LINUX_LOADMAP PTRACE_GETFDPIC
6527 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6528 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6532 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6533 unsigned char *myaddr
, unsigned int len
)
6535 int pid
= lwpid_of (current_thread
);
6537 struct target_loadmap
*data
= NULL
;
6538 unsigned int actual_length
, copy_length
;
6540 if (strcmp (annex
, "exec") == 0)
6541 addr
= (int) LINUX_LOADMAP_EXEC
;
6542 else if (strcmp (annex
, "interp") == 0)
6543 addr
= (int) LINUX_LOADMAP_INTERP
;
6547 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6553 actual_length
= sizeof (struct target_loadmap
)
6554 + sizeof (struct target_loadseg
) * data
->nsegs
;
6556 if (offset
< 0 || offset
> actual_length
)
6559 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6560 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6564 # define linux_read_loadmap NULL
6565 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6568 linux_process_qsupported (char **features
, int count
)
6570 if (the_low_target
.process_qsupported
!= NULL
)
6571 the_low_target
.process_qsupported (features
, count
);
6575 linux_supports_catch_syscall (void)
6577 return (the_low_target
.get_syscall_trapinfo
!= NULL
6578 && linux_supports_tracesysgood ());
6582 linux_get_ipa_tdesc_idx (void)
6584 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6587 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6591 linux_supports_tracepoints (void)
6593 if (*the_low_target
.supports_tracepoints
== NULL
)
6596 return (*the_low_target
.supports_tracepoints
) ();
6600 linux_read_pc (struct regcache
*regcache
)
6602 if (the_low_target
.get_pc
== NULL
)
6605 return (*the_low_target
.get_pc
) (regcache
);
6609 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6611 gdb_assert (the_low_target
.set_pc
!= NULL
);
6613 (*the_low_target
.set_pc
) (regcache
, pc
);
6617 linux_thread_stopped (struct thread_info
*thread
)
6619 return get_thread_lwp (thread
)->stopped
;
6622 /* This exposes stop-all-threads functionality to other modules. */
6625 linux_pause_all (int freeze
)
6627 stop_all_lwps (freeze
, NULL
);
6630 /* This exposes unstop-all-threads functionality to other gdbserver
6634 linux_unpause_all (int unfreeze
)
6636 unstop_all_lwps (unfreeze
, NULL
);
6640 linux_prepare_to_access_memory (void)
6642 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6645 linux_pause_all (1);
6650 linux_done_accessing_memory (void)
6652 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6655 linux_unpause_all (1);
6659 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6660 CORE_ADDR collector
,
6663 CORE_ADDR
*jump_entry
,
6664 CORE_ADDR
*trampoline
,
6665 ULONGEST
*trampoline_size
,
6666 unsigned char *jjump_pad_insn
,
6667 ULONGEST
*jjump_pad_insn_size
,
6668 CORE_ADDR
*adjusted_insn_addr
,
6669 CORE_ADDR
*adjusted_insn_addr_end
,
6672 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6673 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6674 jump_entry
, trampoline
, trampoline_size
,
6675 jjump_pad_insn
, jjump_pad_insn_size
,
6676 adjusted_insn_addr
, adjusted_insn_addr_end
,
6680 static struct emit_ops
*
6681 linux_emit_ops (void)
6683 if (the_low_target
.emit_ops
!= NULL
)
6684 return (*the_low_target
.emit_ops
) ();
6690 linux_get_min_fast_tracepoint_insn_len (void)
6692 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6695 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6698 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6699 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6701 char filename
[PATH_MAX
];
6703 const int auxv_size
= is_elf64
6704 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6705 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6707 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6709 fd
= open (filename
, O_RDONLY
);
6715 while (read (fd
, buf
, auxv_size
) == auxv_size
6716 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6720 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6722 switch (aux
->a_type
)
6725 *phdr_memaddr
= aux
->a_un
.a_val
;
6728 *num_phdr
= aux
->a_un
.a_val
;
6734 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6736 switch (aux
->a_type
)
6739 *phdr_memaddr
= aux
->a_un
.a_val
;
6742 *num_phdr
= aux
->a_un
.a_val
;
6750 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6752 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6753 "phdr_memaddr = %ld, phdr_num = %d",
6754 (long) *phdr_memaddr
, *num_phdr
);
6761 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6764 get_dynamic (const int pid
, const int is_elf64
)
6766 CORE_ADDR phdr_memaddr
, relocation
;
6768 unsigned char *phdr_buf
;
6769 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6771 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6774 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6775 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6777 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6780 /* Compute relocation: it is expected to be 0 for "regular" executables,
6781 non-zero for PIE ones. */
6783 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6786 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6788 if (p
->p_type
== PT_PHDR
)
6789 relocation
= phdr_memaddr
- p
->p_vaddr
;
6793 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6795 if (p
->p_type
== PT_PHDR
)
6796 relocation
= phdr_memaddr
- p
->p_vaddr
;
6799 if (relocation
== -1)
6801 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6802 any real world executables, including PIE executables, have always
6803 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6804 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6805 or present DT_DEBUG anyway (fpc binaries are statically linked).
6807 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6809 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6814 for (i
= 0; i
< num_phdr
; i
++)
6818 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6820 if (p
->p_type
== PT_DYNAMIC
)
6821 return p
->p_vaddr
+ relocation
;
6825 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6827 if (p
->p_type
== PT_DYNAMIC
)
6828 return p
->p_vaddr
+ relocation
;
6835 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6836 can be 0 if the inferior does not yet have the library list initialized.
6837 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6838 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6841 get_r_debug (const int pid
, const int is_elf64
)
6843 CORE_ADDR dynamic_memaddr
;
6844 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6845 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6848 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6849 if (dynamic_memaddr
== 0)
6852 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6856 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6857 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6861 unsigned char buf
[sizeof (Elf64_Xword
)];
6865 #ifdef DT_MIPS_RLD_MAP
6866 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6868 if (linux_read_memory (dyn
->d_un
.d_val
,
6869 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6874 #endif /* DT_MIPS_RLD_MAP */
6875 #ifdef DT_MIPS_RLD_MAP_REL
6876 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6878 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6879 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6884 #endif /* DT_MIPS_RLD_MAP_REL */
6886 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6887 map
= dyn
->d_un
.d_val
;
6889 if (dyn
->d_tag
== DT_NULL
)
6894 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6895 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6899 unsigned char buf
[sizeof (Elf32_Word
)];
6903 #ifdef DT_MIPS_RLD_MAP
6904 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6906 if (linux_read_memory (dyn
->d_un
.d_val
,
6907 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6912 #endif /* DT_MIPS_RLD_MAP */
6913 #ifdef DT_MIPS_RLD_MAP_REL
6914 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6916 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6917 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6922 #endif /* DT_MIPS_RLD_MAP_REL */
6924 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6925 map
= dyn
->d_un
.d_val
;
6927 if (dyn
->d_tag
== DT_NULL
)
6931 dynamic_memaddr
+= dyn_size
;
6937 /* Read one pointer from MEMADDR in the inferior. */
6940 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6944 /* Go through a union so this works on either big or little endian
6945 hosts, when the inferior's pointer size is smaller than the size
6946 of CORE_ADDR. It is assumed the inferior's endianness is the
6947 same of the superior's. */
6950 CORE_ADDR core_addr
;
6955 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6958 if (ptr_size
== sizeof (CORE_ADDR
))
6959 *ptr
= addr
.core_addr
;
6960 else if (ptr_size
== sizeof (unsigned int))
6963 gdb_assert_not_reached ("unhandled pointer size");
6968 struct link_map_offsets
6970 /* Offset and size of r_debug.r_version. */
6971 int r_version_offset
;
6973 /* Offset and size of r_debug.r_map. */
6976 /* Offset to l_addr field in struct link_map. */
6979 /* Offset to l_name field in struct link_map. */
6982 /* Offset to l_ld field in struct link_map. */
6985 /* Offset to l_next field in struct link_map. */
6988 /* Offset to l_prev field in struct link_map. */
6992 /* Construct qXfer:libraries-svr4:read reply. */
6995 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
6996 unsigned const char *writebuf
,
6997 CORE_ADDR offset
, int len
)
7000 unsigned document_len
;
7001 struct process_info_private
*const priv
= current_process ()->priv
;
7002 char filename
[PATH_MAX
];
7005 static const struct link_map_offsets lmo_32bit_offsets
=
7007 0, /* r_version offset. */
7008 4, /* r_debug.r_map offset. */
7009 0, /* l_addr offset in link_map. */
7010 4, /* l_name offset in link_map. */
7011 8, /* l_ld offset in link_map. */
7012 12, /* l_next offset in link_map. */
7013 16 /* l_prev offset in link_map. */
7016 static const struct link_map_offsets lmo_64bit_offsets
=
7018 0, /* r_version offset. */
7019 8, /* r_debug.r_map offset. */
7020 0, /* l_addr offset in link_map. */
7021 8, /* l_name offset in link_map. */
7022 16, /* l_ld offset in link_map. */
7023 24, /* l_next offset in link_map. */
7024 32 /* l_prev offset in link_map. */
7026 const struct link_map_offsets
*lmo
;
7027 unsigned int machine
;
7029 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7030 int allocated
= 1024;
7032 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7033 int header_done
= 0;
7035 if (writebuf
!= NULL
)
7037 if (readbuf
== NULL
)
7040 pid
= lwpid_of (current_thread
);
7041 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7042 is_elf64
= elf_64_file_p (filename
, &machine
);
7043 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7044 ptr_size
= is_elf64
? 8 : 4;
7046 while (annex
[0] != '\0')
7052 sep
= strchr (annex
, '=');
7057 if (len
== 5 && startswith (annex
, "start"))
7059 else if (len
== 4 && startswith (annex
, "prev"))
7063 annex
= strchr (sep
, ';');
7070 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7077 if (priv
->r_debug
== 0)
7078 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7080 /* We failed to find DT_DEBUG. Such situation will not change
7081 for this inferior - do not retry it. Report it to GDB as
7082 E01, see for the reasons at the GDB solib-svr4.c side. */
7083 if (priv
->r_debug
== (CORE_ADDR
) -1)
7086 if (priv
->r_debug
!= 0)
7088 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7089 (unsigned char *) &r_version
,
7090 sizeof (r_version
)) != 0
7093 warning ("unexpected r_debug version %d", r_version
);
7095 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7096 &lm_addr
, ptr_size
) != 0)
7098 warning ("unable to read r_map from 0x%lx",
7099 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7104 document
= (char *) xmalloc (allocated
);
7105 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7106 p
= document
+ strlen (document
);
7109 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7110 &l_name
, ptr_size
) == 0
7111 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7112 &l_addr
, ptr_size
) == 0
7113 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7114 &l_ld
, ptr_size
) == 0
7115 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7116 &l_prev
, ptr_size
) == 0
7117 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7118 &l_next
, ptr_size
) == 0)
7120 unsigned char libname
[PATH_MAX
];
7122 if (lm_prev
!= l_prev
)
7124 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7125 (long) lm_prev
, (long) l_prev
);
7129 /* Ignore the first entry even if it has valid name as the first entry
7130 corresponds to the main executable. The first entry should not be
7131 skipped if the dynamic loader was loaded late by a static executable
7132 (see solib-svr4.c parameter ignore_first). But in such case the main
7133 executable does not have PT_DYNAMIC present and this function already
7134 exited above due to failed get_r_debug. */
7137 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7142 /* Not checking for error because reading may stop before
7143 we've got PATH_MAX worth of characters. */
7145 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7146 libname
[sizeof (libname
) - 1] = '\0';
7147 if (libname
[0] != '\0')
7149 /* 6x the size for xml_escape_text below. */
7150 size_t len
= 6 * strlen ((char *) libname
);
7154 /* Terminate `<library-list-svr4'. */
7159 while (allocated
< p
- document
+ len
+ 200)
7161 /* Expand to guarantee sufficient storage. */
7162 uintptr_t document_len
= p
- document
;
7164 document
= (char *) xrealloc (document
, 2 * allocated
);
7166 p
= document
+ document_len
;
7169 std::string name
= xml_escape_text ((char *) libname
);
7170 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7171 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7172 name
.c_str (), (unsigned long) lm_addr
,
7173 (unsigned long) l_addr
, (unsigned long) l_ld
);
7183 /* Empty list; terminate `<library-list-svr4'. */
7187 strcpy (p
, "</library-list-svr4>");
7189 document_len
= strlen (document
);
7190 if (offset
< document_len
)
7191 document_len
-= offset
;
7194 if (len
> document_len
)
7197 memcpy (readbuf
, document
+ offset
, len
);
7203 #ifdef HAVE_LINUX_BTRACE
7205 /* See to_disable_btrace target method. */
7208 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7210 enum btrace_error err
;
7212 err
= linux_disable_btrace (tinfo
);
7213 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7216 /* Encode an Intel Processor Trace configuration. */
7219 linux_low_encode_pt_config (struct buffer
*buffer
,
7220 const struct btrace_data_pt_config
*config
)
7222 buffer_grow_str (buffer
, "<pt-config>\n");
7224 switch (config
->cpu
.vendor
)
7227 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7228 "model=\"%u\" stepping=\"%u\"/>\n",
7229 config
->cpu
.family
, config
->cpu
.model
,
7230 config
->cpu
.stepping
);
7237 buffer_grow_str (buffer
, "</pt-config>\n");
7240 /* Encode a raw buffer. */
7243 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7249 /* We use hex encoding - see common/rsp-low.h. */
7250 buffer_grow_str (buffer
, "<raw>\n");
7256 elem
[0] = tohex ((*data
>> 4) & 0xf);
7257 elem
[1] = tohex (*data
++ & 0xf);
7259 buffer_grow (buffer
, elem
, 2);
7262 buffer_grow_str (buffer
, "</raw>\n");
7265 /* See to_read_btrace target method. */
7268 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7269 enum btrace_read_type type
)
7271 struct btrace_data btrace
;
7272 struct btrace_block
*block
;
7273 enum btrace_error err
;
7276 btrace_data_init (&btrace
);
7278 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7279 if (err
!= BTRACE_ERR_NONE
)
7281 if (err
== BTRACE_ERR_OVERFLOW
)
7282 buffer_grow_str0 (buffer
, "E.Overflow.");
7284 buffer_grow_str0 (buffer
, "E.Generic Error.");
7289 switch (btrace
.format
)
7291 case BTRACE_FORMAT_NONE
:
7292 buffer_grow_str0 (buffer
, "E.No Trace.");
7295 case BTRACE_FORMAT_BTS
:
7296 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7297 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7300 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7302 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7303 paddress (block
->begin
), paddress (block
->end
));
7305 buffer_grow_str0 (buffer
, "</btrace>\n");
7308 case BTRACE_FORMAT_PT
:
7309 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7310 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7311 buffer_grow_str (buffer
, "<pt>\n");
7313 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7315 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7316 btrace
.variant
.pt
.size
);
7318 buffer_grow_str (buffer
, "</pt>\n");
7319 buffer_grow_str0 (buffer
, "</btrace>\n");
7323 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7327 btrace_data_fini (&btrace
);
7331 btrace_data_fini (&btrace
);
7335 /* See to_btrace_conf target method. */
7338 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7339 struct buffer
*buffer
)
7341 const struct btrace_config
*conf
;
7343 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7344 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7346 conf
= linux_btrace_conf (tinfo
);
7349 switch (conf
->format
)
7351 case BTRACE_FORMAT_NONE
:
7354 case BTRACE_FORMAT_BTS
:
7355 buffer_xml_printf (buffer
, "<bts");
7356 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7357 buffer_xml_printf (buffer
, " />\n");
7360 case BTRACE_FORMAT_PT
:
7361 buffer_xml_printf (buffer
, "<pt");
7362 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7363 buffer_xml_printf (buffer
, "/>\n");
7368 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7371 #endif /* HAVE_LINUX_BTRACE */
7373 /* See nat/linux-nat.h. */
7376 current_lwp_ptid (void)
7378 return ptid_of (current_thread
);
7381 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7384 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7386 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7387 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7389 return default_breakpoint_kind_from_pc (pcptr
);
7392 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7394 static const gdb_byte
*
7395 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7397 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7399 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7402 /* Implementation of the target_ops method
7403 "breakpoint_kind_from_current_state". */
7406 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7408 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7409 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7411 return linux_breakpoint_kind_from_pc (pcptr
);
7414 /* Default implementation of linux_target_ops method "set_pc" for
7415 32-bit pc register which is literally named "pc". */
7418 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7420 uint32_t newpc
= pc
;
7422 supply_register_by_name (regcache
, "pc", &newpc
);
7425 /* Default implementation of linux_target_ops method "get_pc" for
7426 32-bit pc register which is literally named "pc". */
7429 linux_get_pc_32bit (struct regcache
*regcache
)
7433 collect_register_by_name (regcache
, "pc", &pc
);
7435 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7439 /* Default implementation of linux_target_ops method "set_pc" for
7440 64-bit pc register which is literally named "pc". */
7443 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7445 uint64_t newpc
= pc
;
7447 supply_register_by_name (regcache
, "pc", &newpc
);
7450 /* Default implementation of linux_target_ops method "get_pc" for
7451 64-bit pc register which is literally named "pc". */
7454 linux_get_pc_64bit (struct regcache
*regcache
)
7458 collect_register_by_name (regcache
, "pc", &pc
);
7460 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7465 static struct target_ops linux_target_ops
= {
7466 linux_create_inferior
,
7467 linux_post_create_inferior
,
7476 linux_fetch_registers
,
7477 linux_store_registers
,
7478 linux_prepare_to_access_memory
,
7479 linux_done_accessing_memory
,
7482 linux_look_up_symbols
,
7483 linux_request_interrupt
,
7485 linux_supports_z_point_type
,
7488 linux_stopped_by_sw_breakpoint
,
7489 linux_supports_stopped_by_sw_breakpoint
,
7490 linux_stopped_by_hw_breakpoint
,
7491 linux_supports_stopped_by_hw_breakpoint
,
7492 linux_supports_hardware_single_step
,
7493 linux_stopped_by_watchpoint
,
7494 linux_stopped_data_address
,
7495 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7496 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7497 && defined(PT_TEXT_END_ADDR)
7502 #ifdef USE_THREAD_DB
7503 thread_db_get_tls_address
,
7508 hostio_last_error_from_errno
,
7511 linux_supports_non_stop
,
7513 linux_start_non_stop
,
7514 linux_supports_multi_process
,
7515 linux_supports_fork_events
,
7516 linux_supports_vfork_events
,
7517 linux_supports_exec_events
,
7518 linux_handle_new_gdb_connection
,
7519 #ifdef USE_THREAD_DB
7520 thread_db_handle_monitor_command
,
7524 linux_common_core_of_thread
,
7526 linux_process_qsupported
,
7527 linux_supports_tracepoints
,
7530 linux_thread_stopped
,
7534 linux_stabilize_threads
,
7535 linux_install_fast_tracepoint_jump_pad
,
7537 linux_supports_disable_randomization
,
7538 linux_get_min_fast_tracepoint_insn_len
,
7539 linux_qxfer_libraries_svr4
,
7540 linux_supports_agent
,
7541 #ifdef HAVE_LINUX_BTRACE
7542 linux_supports_btrace
,
7543 linux_enable_btrace
,
7544 linux_low_disable_btrace
,
7545 linux_low_read_btrace
,
7546 linux_low_btrace_conf
,
7554 linux_supports_range_stepping
,
7555 linux_proc_pid_to_exec_file
,
7556 linux_mntns_open_cloexec
,
7558 linux_mntns_readlink
,
7559 linux_breakpoint_kind_from_pc
,
7560 linux_sw_breakpoint_from_kind
,
7561 linux_proc_tid_get_name
,
7562 linux_breakpoint_kind_from_current_state
,
7563 linux_supports_software_single_step
,
7564 linux_supports_catch_syscall
,
7565 linux_get_ipa_tdesc_idx
,
7567 thread_db_thread_handle
,
7573 #ifdef HAVE_LINUX_REGSETS
7575 initialize_regsets_info (struct regsets_info
*info
)
7577 for (info
->num_regsets
= 0;
7578 info
->regsets
[info
->num_regsets
].size
>= 0;
7579 info
->num_regsets
++)
7585 initialize_low (void)
7587 struct sigaction sigchld_action
;
7589 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7590 set_target_ops (&linux_target_ops
);
7592 linux_ptrace_init_warnings ();
7594 sigchld_action
.sa_handler
= sigchld_handler
;
7595 sigemptyset (&sigchld_action
.sa_mask
);
7596 sigchld_action
.sa_flags
= SA_RESTART
;
7597 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7599 initialize_low_arch ();
7601 linux_check_ptrace_features ();