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_inferior'. Returns the first LWP that is not
1924 stopped. ARG is a PTID filter. */
1927 not_stopped_callback (thread_info
*thread
, void *arg
)
1929 struct lwp_info
*lwp
;
1930 ptid_t filter
= *(ptid_t
*) arg
;
1932 if (!ptid_match (ptid_of (thread
), filter
))
1935 lwp
= get_thread_lwp (thread
);
1942 /* Increment LWP's suspend count. */
1945 lwp_suspended_inc (struct lwp_info
*lwp
)
1949 if (debug_threads
&& lwp
->suspended
> 4)
1951 struct thread_info
*thread
= get_lwp_thread (lwp
);
1953 debug_printf ("LWP %ld has a suspiciously high suspend count,"
1954 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
1958 /* Decrement LWP's suspend count. */
1961 lwp_suspended_decr (struct lwp_info
*lwp
)
1965 if (lwp
->suspended
< 0)
1967 struct thread_info
*thread
= get_lwp_thread (lwp
);
1969 internal_error (__FILE__
, __LINE__
,
1970 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
1975 /* This function should only be called if the LWP got a SIGTRAP.
1977 Handle any tracepoint steps or hits. Return true if a tracepoint
1978 event was handled, 0 otherwise. */
1981 handle_tracepoints (struct lwp_info
*lwp
)
1983 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1984 int tpoint_related_event
= 0;
1986 gdb_assert (lwp
->suspended
== 0);
1988 /* If this tracepoint hit causes a tracing stop, we'll immediately
1989 uninsert tracepoints. To do this, we temporarily pause all
1990 threads, unpatch away, and then unpause threads. We need to make
1991 sure the unpausing doesn't resume LWP too. */
1992 lwp_suspended_inc (lwp
);
1994 /* And we need to be sure that any all-threads-stopping doesn't try
1995 to move threads out of the jump pads, as it could deadlock the
1996 inferior (LWP could be in the jump pad, maybe even holding the
1999 /* Do any necessary step collect actions. */
2000 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2002 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2004 /* See if we just hit a tracepoint and do its main collect
2006 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2008 lwp_suspended_decr (lwp
);
2010 gdb_assert (lwp
->suspended
== 0);
2011 gdb_assert (!stabilizing_threads
2012 || (lwp
->collecting_fast_tracepoint
2013 != fast_tpoint_collect_result::not_collecting
));
2015 if (tpoint_related_event
)
2018 debug_printf ("got a tracepoint event\n");
2025 /* Convenience wrapper. Returns information about LWP's fast tracepoint
2026 collection status. */
2028 static fast_tpoint_collect_result
2029 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2030 struct fast_tpoint_collect_status
*status
)
2032 CORE_ADDR thread_area
;
2033 struct thread_info
*thread
= get_lwp_thread (lwp
);
2035 if (the_low_target
.get_thread_area
== NULL
)
2036 return fast_tpoint_collect_result::not_collecting
;
2038 /* Get the thread area address. This is used to recognize which
2039 thread is which when tracing with the in-process agent library.
2040 We don't read anything from the address, and treat it as opaque;
2041 it's the address itself that we assume is unique per-thread. */
2042 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2043 return fast_tpoint_collect_result::not_collecting
;
2045 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2048 /* The reason we resume in the caller, is because we want to be able
2049 to pass lwp->status_pending as WSTAT, and we need to clear
2050 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2051 refuses to resume. */
2054 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2056 struct thread_info
*saved_thread
;
2058 saved_thread
= current_thread
;
2059 current_thread
= get_lwp_thread (lwp
);
2062 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2063 && supports_fast_tracepoints ()
2064 && agent_loaded_p ())
2066 struct fast_tpoint_collect_status status
;
2069 debug_printf ("Checking whether LWP %ld needs to move out of the "
2071 lwpid_of (current_thread
));
2073 fast_tpoint_collect_result r
2074 = linux_fast_tracepoint_collecting (lwp
, &status
);
2077 || (WSTOPSIG (*wstat
) != SIGILL
2078 && WSTOPSIG (*wstat
) != SIGFPE
2079 && WSTOPSIG (*wstat
) != SIGSEGV
2080 && WSTOPSIG (*wstat
) != SIGBUS
))
2082 lwp
->collecting_fast_tracepoint
= r
;
2084 if (r
!= fast_tpoint_collect_result::not_collecting
)
2086 if (r
== fast_tpoint_collect_result::before_insn
2087 && lwp
->exit_jump_pad_bkpt
== NULL
)
2089 /* Haven't executed the original instruction yet.
2090 Set breakpoint there, and wait till it's hit,
2091 then single-step until exiting the jump pad. */
2092 lwp
->exit_jump_pad_bkpt
2093 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2097 debug_printf ("Checking whether LWP %ld needs to move out of "
2098 "the jump pad...it does\n",
2099 lwpid_of (current_thread
));
2100 current_thread
= saved_thread
;
2107 /* If we get a synchronous signal while collecting, *and*
2108 while executing the (relocated) original instruction,
2109 reset the PC to point at the tpoint address, before
2110 reporting to GDB. Otherwise, it's an IPA lib bug: just
2111 report the signal to GDB, and pray for the best. */
2113 lwp
->collecting_fast_tracepoint
2114 = fast_tpoint_collect_result::not_collecting
;
2116 if (r
!= fast_tpoint_collect_result::not_collecting
2117 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2118 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2121 struct regcache
*regcache
;
2123 /* The si_addr on a few signals references the address
2124 of the faulting instruction. Adjust that as
2126 if ((WSTOPSIG (*wstat
) == SIGILL
2127 || WSTOPSIG (*wstat
) == SIGFPE
2128 || WSTOPSIG (*wstat
) == SIGBUS
2129 || WSTOPSIG (*wstat
) == SIGSEGV
)
2130 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2131 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2132 /* Final check just to make sure we don't clobber
2133 the siginfo of non-kernel-sent signals. */
2134 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2136 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2137 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2138 (PTRACE_TYPE_ARG3
) 0, &info
);
2141 regcache
= get_thread_regcache (current_thread
, 1);
2142 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2143 lwp
->stop_pc
= status
.tpoint_addr
;
2145 /* Cancel any fast tracepoint lock this thread was
2147 force_unlock_trace_buffer ();
2150 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2153 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2154 "stopping all threads momentarily.\n");
2156 stop_all_lwps (1, lwp
);
2158 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2159 lwp
->exit_jump_pad_bkpt
= NULL
;
2161 unstop_all_lwps (1, lwp
);
2163 gdb_assert (lwp
->suspended
>= 0);
2169 debug_printf ("Checking whether LWP %ld needs to move out of the "
2171 lwpid_of (current_thread
));
2173 current_thread
= saved_thread
;
2177 /* Enqueue one signal in the "signals to report later when out of the
2181 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2183 struct pending_signals
*p_sig
;
2184 struct thread_info
*thread
= get_lwp_thread (lwp
);
2187 debug_printf ("Deferring signal %d for LWP %ld.\n",
2188 WSTOPSIG (*wstat
), lwpid_of (thread
));
2192 struct pending_signals
*sig
;
2194 for (sig
= lwp
->pending_signals_to_report
;
2197 debug_printf (" Already queued %d\n",
2200 debug_printf (" (no more currently queued signals)\n");
2203 /* Don't enqueue non-RT signals if they are already in the deferred
2204 queue. (SIGSTOP being the easiest signal to see ending up here
2206 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2208 struct pending_signals
*sig
;
2210 for (sig
= lwp
->pending_signals_to_report
;
2214 if (sig
->signal
== WSTOPSIG (*wstat
))
2217 debug_printf ("Not requeuing already queued non-RT signal %d"
2226 p_sig
= XCNEW (struct pending_signals
);
2227 p_sig
->prev
= lwp
->pending_signals_to_report
;
2228 p_sig
->signal
= WSTOPSIG (*wstat
);
2230 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2233 lwp
->pending_signals_to_report
= p_sig
;
2236 /* Dequeue one signal from the "signals to report later when out of
2237 the jump pad" list. */
2240 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2242 struct thread_info
*thread
= get_lwp_thread (lwp
);
2244 if (lwp
->pending_signals_to_report
!= NULL
)
2246 struct pending_signals
**p_sig
;
2248 p_sig
= &lwp
->pending_signals_to_report
;
2249 while ((*p_sig
)->prev
!= NULL
)
2250 p_sig
= &(*p_sig
)->prev
;
2252 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2253 if ((*p_sig
)->info
.si_signo
!= 0)
2254 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2260 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2261 WSTOPSIG (*wstat
), lwpid_of (thread
));
2265 struct pending_signals
*sig
;
2267 for (sig
= lwp
->pending_signals_to_report
;
2270 debug_printf (" Still queued %d\n",
2273 debug_printf (" (no more queued signals)\n");
2282 /* Fetch the possibly triggered data watchpoint info and store it in
2285 On some archs, like x86, that use debug registers to set
2286 watchpoints, it's possible that the way to know which watched
2287 address trapped, is to check the register that is used to select
2288 which address to watch. Problem is, between setting the watchpoint
2289 and reading back which data address trapped, the user may change
2290 the set of watchpoints, and, as a consequence, GDB changes the
2291 debug registers in the inferior. To avoid reading back a stale
2292 stopped-data-address when that happens, we cache in LP the fact
2293 that a watchpoint trapped, and the corresponding data address, as
2294 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2295 registers meanwhile, we have the cached data we can rely on. */
2298 check_stopped_by_watchpoint (struct lwp_info
*child
)
2300 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2302 struct thread_info
*saved_thread
;
2304 saved_thread
= current_thread
;
2305 current_thread
= get_lwp_thread (child
);
2307 if (the_low_target
.stopped_by_watchpoint ())
2309 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2311 if (the_low_target
.stopped_data_address
!= NULL
)
2312 child
->stopped_data_address
2313 = the_low_target
.stopped_data_address ();
2315 child
->stopped_data_address
= 0;
2318 current_thread
= saved_thread
;
2321 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2324 /* Return the ptrace options that we want to try to enable. */
2327 linux_low_ptrace_options (int attached
)
2332 options
|= PTRACE_O_EXITKILL
;
2334 if (report_fork_events
)
2335 options
|= PTRACE_O_TRACEFORK
;
2337 if (report_vfork_events
)
2338 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2340 if (report_exec_events
)
2341 options
|= PTRACE_O_TRACEEXEC
;
2343 options
|= PTRACE_O_TRACESYSGOOD
;
2348 /* Do low-level handling of the event, and check if we should go on
2349 and pass it to caller code. Return the affected lwp if we are, or
2352 static struct lwp_info
*
2353 linux_low_filter_event (int lwpid
, int wstat
)
2355 struct lwp_info
*child
;
2356 struct thread_info
*thread
;
2357 int have_stop_pc
= 0;
2359 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2361 /* Check for stop events reported by a process we didn't already
2362 know about - anything not already in our LWP list.
2364 If we're expecting to receive stopped processes after
2365 fork, vfork, and clone events, then we'll just add the
2366 new one to our list and go back to waiting for the event
2367 to be reported - the stopped process might be returned
2368 from waitpid before or after the event is.
2370 But note the case of a non-leader thread exec'ing after the
2371 leader having exited, and gone from our lists (because
2372 check_zombie_leaders deleted it). The non-leader thread
2373 changes its tid to the tgid. */
2375 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2376 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2380 /* A multi-thread exec after we had seen the leader exiting. */
2383 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2384 "after exec.\n", lwpid
);
2387 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2388 child
= add_lwp (child_ptid
);
2390 current_thread
= child
->thread
;
2393 /* If we didn't find a process, one of two things presumably happened:
2394 - A process we started and then detached from has exited. Ignore it.
2395 - A process we are controlling has forked and the new child's stop
2396 was reported to us by the kernel. Save its PID. */
2397 if (child
== NULL
&& WIFSTOPPED (wstat
))
2399 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2402 else if (child
== NULL
)
2405 thread
= get_lwp_thread (child
);
2409 child
->last_status
= wstat
;
2411 /* Check if the thread has exited. */
2412 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2415 debug_printf ("LLFE: %d exited.\n", lwpid
);
2417 if (finish_step_over (child
))
2419 /* Unsuspend all other LWPs, and set them back running again. */
2420 unsuspend_all_lwps (child
);
2423 /* If there is at least one more LWP, then the exit signal was
2424 not the end of the debugged application and should be
2425 ignored, unless GDB wants to hear about thread exits. */
2426 if (report_thread_events
2427 || last_thread_of_process_p (pid_of (thread
)))
2429 /* Since events are serialized to GDB core, and we can't
2430 report this one right now. Leave the status pending for
2431 the next time we're able to report it. */
2432 mark_lwp_dead (child
, wstat
);
2442 gdb_assert (WIFSTOPPED (wstat
));
2444 if (WIFSTOPPED (wstat
))
2446 struct process_info
*proc
;
2448 /* Architecture-specific setup after inferior is running. */
2449 proc
= find_process_pid (pid_of (thread
));
2450 if (proc
->tdesc
== NULL
)
2454 /* This needs to happen after we have attached to the
2455 inferior and it is stopped for the first time, but
2456 before we access any inferior registers. */
2457 linux_arch_setup_thread (thread
);
2461 /* The process is started, but GDBserver will do
2462 architecture-specific setup after the program stops at
2463 the first instruction. */
2464 child
->status_pending_p
= 1;
2465 child
->status_pending
= wstat
;
2471 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2473 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2474 int options
= linux_low_ptrace_options (proc
->attached
);
2476 linux_enable_event_reporting (lwpid
, options
);
2477 child
->must_set_ptrace_flags
= 0;
2480 /* Always update syscall_state, even if it will be filtered later. */
2481 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2483 child
->syscall_state
2484 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2485 ? TARGET_WAITKIND_SYSCALL_RETURN
2486 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2490 /* Almost all other ptrace-stops are known to be outside of system
2491 calls, with further exceptions in handle_extended_wait. */
2492 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2495 /* Be careful to not overwrite stop_pc until save_stop_reason is
2497 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2498 && linux_is_extended_waitstatus (wstat
))
2500 child
->stop_pc
= get_pc (child
);
2501 if (handle_extended_wait (&child
, wstat
))
2503 /* The event has been handled, so just return without
2509 if (linux_wstatus_maybe_breakpoint (wstat
))
2511 if (save_stop_reason (child
))
2516 child
->stop_pc
= get_pc (child
);
2518 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2519 && child
->stop_expected
)
2522 debug_printf ("Expected stop.\n");
2523 child
->stop_expected
= 0;
2525 if (thread
->last_resume_kind
== resume_stop
)
2527 /* We want to report the stop to the core. Treat the
2528 SIGSTOP as a normal event. */
2530 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2531 target_pid_to_str (ptid_of (thread
)));
2533 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2535 /* Stopping threads. We don't want this SIGSTOP to end up
2538 debug_printf ("LLW: SIGSTOP caught for %s "
2539 "while stopping threads.\n",
2540 target_pid_to_str (ptid_of (thread
)));
2545 /* This is a delayed SIGSTOP. Filter out the event. */
2547 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2548 child
->stepping
? "step" : "continue",
2549 target_pid_to_str (ptid_of (thread
)));
2551 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2556 child
->status_pending_p
= 1;
2557 child
->status_pending
= wstat
;
2561 /* Return true if THREAD is doing hardware single step. */
2564 maybe_hw_step (struct thread_info
*thread
)
2566 if (can_hardware_single_step ())
2570 /* GDBserver must insert single-step breakpoint for software
2572 gdb_assert (has_single_step_breakpoints (thread
));
2577 /* Resume LWPs that are currently stopped without any pending status
2578 to report, but are resumed from the core's perspective. */
2581 resume_stopped_resumed_lwps (thread_info
*thread
)
2583 struct lwp_info
*lp
= get_thread_lwp (thread
);
2587 && !lp
->status_pending_p
2588 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2592 if (thread
->last_resume_kind
== resume_step
)
2593 step
= maybe_hw_step (thread
);
2596 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2597 target_pid_to_str (ptid_of (thread
)),
2598 paddress (lp
->stop_pc
),
2601 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2605 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2606 match FILTER_PTID (leaving others pending). The PTIDs can be:
2607 minus_one_ptid, to specify any child; a pid PTID, specifying all
2608 lwps of a thread group; or a PTID representing a single lwp. Store
2609 the stop status through the status pointer WSTAT. OPTIONS is
2610 passed to the waitpid call. Return 0 if no event was found and
2611 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2612 was found. Return the PID of the stopped child otherwise. */
2615 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2616 int *wstatp
, int options
)
2618 struct thread_info
*event_thread
;
2619 struct lwp_info
*event_child
, *requested_child
;
2620 sigset_t block_mask
, prev_mask
;
2623 /* N.B. event_thread points to the thread_info struct that contains
2624 event_child. Keep them in sync. */
2625 event_thread
= NULL
;
2627 requested_child
= NULL
;
2629 /* Check for a lwp with a pending status. */
2631 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2633 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2635 return status_pending_p_callback (thread
, filter_ptid
);
2638 if (event_thread
!= NULL
)
2639 event_child
= get_thread_lwp (event_thread
);
2640 if (debug_threads
&& event_thread
)
2641 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2643 else if (!ptid_equal (filter_ptid
, null_ptid
))
2645 requested_child
= find_lwp_pid (filter_ptid
);
2647 if (stopping_threads
== NOT_STOPPING_THREADS
2648 && requested_child
->status_pending_p
2649 && (requested_child
->collecting_fast_tracepoint
2650 != fast_tpoint_collect_result::not_collecting
))
2652 enqueue_one_deferred_signal (requested_child
,
2653 &requested_child
->status_pending
);
2654 requested_child
->status_pending_p
= 0;
2655 requested_child
->status_pending
= 0;
2656 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2659 if (requested_child
->suspended
2660 && requested_child
->status_pending_p
)
2662 internal_error (__FILE__
, __LINE__
,
2663 "requesting an event out of a"
2664 " suspended child?");
2667 if (requested_child
->status_pending_p
)
2669 event_child
= requested_child
;
2670 event_thread
= get_lwp_thread (event_child
);
2674 if (event_child
!= NULL
)
2677 debug_printf ("Got an event from pending child %ld (%04x)\n",
2678 lwpid_of (event_thread
), event_child
->status_pending
);
2679 *wstatp
= event_child
->status_pending
;
2680 event_child
->status_pending_p
= 0;
2681 event_child
->status_pending
= 0;
2682 current_thread
= event_thread
;
2683 return lwpid_of (event_thread
);
2686 /* But if we don't find a pending event, we'll have to wait.
2688 We only enter this loop if no process has a pending wait status.
2689 Thus any action taken in response to a wait status inside this
2690 loop is responding as soon as we detect the status, not after any
2693 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2694 all signals while here. */
2695 sigfillset (&block_mask
);
2696 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2698 /* Always pull all events out of the kernel. We'll randomly select
2699 an event LWP out of all that have events, to prevent
2701 while (event_child
== NULL
)
2705 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2708 - If the thread group leader exits while other threads in the
2709 thread group still exist, waitpid(TGID, ...) hangs. That
2710 waitpid won't return an exit status until the other threads
2711 in the group are reaped.
2713 - When a non-leader thread execs, that thread just vanishes
2714 without reporting an exit (so we'd hang if we waited for it
2715 explicitly in that case). The exec event is reported to
2718 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2721 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2722 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2728 debug_printf ("LLW: waitpid %ld received %s\n",
2729 (long) ret
, status_to_str (*wstatp
));
2732 /* Filter all events. IOW, leave all events pending. We'll
2733 randomly select an event LWP out of all that have events
2735 linux_low_filter_event (ret
, *wstatp
);
2736 /* Retry until nothing comes out of waitpid. A single
2737 SIGCHLD can indicate more than one child stopped. */
2741 /* Now that we've pulled all events out of the kernel, resume
2742 LWPs that don't have an interesting event to report. */
2743 if (stopping_threads
== NOT_STOPPING_THREADS
)
2744 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2746 /* ... and find an LWP with a status to report to the core, if
2748 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2750 return status_pending_p_callback (thread
, filter_ptid
);
2753 if (event_thread
!= NULL
)
2755 event_child
= get_thread_lwp (event_thread
);
2756 *wstatp
= event_child
->status_pending
;
2757 event_child
->status_pending_p
= 0;
2758 event_child
->status_pending
= 0;
2762 /* Check for zombie thread group leaders. Those can't be reaped
2763 until all other threads in the thread group are. */
2764 check_zombie_leaders ();
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_inferior (&all_threads
,
2774 not_stopped_callback
,
2775 &wait_ptid
) == NULL
))
2778 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2779 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2783 /* No interesting event to report to the caller. */
2784 if ((options
& WNOHANG
))
2787 debug_printf ("WNOHANG set, no event found\n");
2789 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2793 /* Block until we get an event reported with SIGCHLD. */
2795 debug_printf ("sigsuspend'ing\n");
2797 sigsuspend (&prev_mask
);
2798 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2802 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2804 current_thread
= event_thread
;
2806 return lwpid_of (event_thread
);
2809 /* Wait for an event from child(ren) PTID. PTIDs can be:
2810 minus_one_ptid, to specify any child; a pid PTID, specifying all
2811 lwps of a thread group; or a PTID representing a single lwp. Store
2812 the stop status through the status pointer WSTAT. OPTIONS is
2813 passed to the waitpid call. Return 0 if no event was found and
2814 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2815 was found. Return the PID of the stopped child otherwise. */
2818 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2820 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2823 /* Count the LWP's that have had events. */
2826 count_events_callback (thread_info
*thread
, void *data
)
2828 struct lwp_info
*lp
= get_thread_lwp (thread
);
2829 int *count
= (int *) data
;
2831 gdb_assert (count
!= NULL
);
2833 /* Count only resumed LWPs that have an event pending. */
2834 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2835 && lp
->status_pending_p
)
2841 /* Select the LWP (if any) that is currently being single-stepped. */
2844 select_singlestep_lwp_callback (thread_info
*thread
, void *data
)
2846 struct lwp_info
*lp
= get_thread_lwp (thread
);
2848 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2849 && thread
->last_resume_kind
== resume_step
2850 && lp
->status_pending_p
)
2856 /* Select the Nth LWP that has had an event. */
2859 select_event_lwp_callback (thread_info
*thread
, void *data
)
2861 struct lwp_info
*lp
= get_thread_lwp (thread
);
2862 int *selector
= (int *) data
;
2864 gdb_assert (selector
!= NULL
);
2866 /* Select only resumed LWPs that have an event pending. */
2867 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2868 && lp
->status_pending_p
)
2869 if ((*selector
)-- == 0)
2875 /* Select one LWP out of those that have events pending. */
2878 select_event_lwp (struct lwp_info
**orig_lp
)
2881 int random_selector
;
2882 struct thread_info
*event_thread
= NULL
;
2884 /* In all-stop, give preference to the LWP that is being
2885 single-stepped. There will be at most one, and it's the LWP that
2886 the core is most interested in. If we didn't do this, then we'd
2887 have to handle pending step SIGTRAPs somehow in case the core
2888 later continues the previously-stepped thread, otherwise we'd
2889 report the pending SIGTRAP, and the core, not having stepped the
2890 thread, wouldn't understand what the trap was for, and therefore
2891 would report it to the user as a random signal. */
2895 = (struct thread_info
*) find_inferior (&all_threads
,
2896 select_singlestep_lwp_callback
,
2898 if (event_thread
!= NULL
)
2901 debug_printf ("SEL: Select single-step %s\n",
2902 target_pid_to_str (ptid_of (event_thread
)));
2905 if (event_thread
== NULL
)
2907 /* No single-stepping LWP. Select one at random, out of those
2908 which have had events. */
2910 /* First see how many events we have. */
2911 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2912 gdb_assert (num_events
> 0);
2914 /* Now randomly pick a LWP out of those that have had
2916 random_selector
= (int)
2917 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2919 if (debug_threads
&& num_events
> 1)
2920 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2921 num_events
, random_selector
);
2924 = (struct thread_info
*) find_inferior (&all_threads
,
2925 select_event_lwp_callback
,
2929 if (event_thread
!= NULL
)
2931 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2933 /* Switch the event LWP. */
2934 *orig_lp
= event_lp
;
2938 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2942 unsuspend_all_lwps (struct lwp_info
*except
)
2944 for_each_thread ([&] (thread_info
*thread
)
2946 lwp_info
*lwp
= get_thread_lwp (thread
);
2949 lwp_suspended_decr (lwp
);
2953 static void move_out_of_jump_pad_callback (thread_info
*thread
);
2954 static bool stuck_in_jump_pad_callback (thread_info
*thread
);
2955 static int lwp_running (thread_info
*thread
, void *data
);
2956 static ptid_t
linux_wait_1 (ptid_t ptid
,
2957 struct target_waitstatus
*ourstatus
,
2958 int target_options
);
2960 /* Stabilize threads (move out of jump pads).
2962 If a thread is midway collecting a fast tracepoint, we need to
2963 finish the collection and move it out of the jump pad before
2964 reporting the signal.
2966 This avoids recursion while collecting (when a signal arrives
2967 midway, and the signal handler itself collects), which would trash
2968 the trace buffer. In case the user set a breakpoint in a signal
2969 handler, this avoids the backtrace showing the jump pad, etc..
2970 Most importantly, there are certain things we can't do safely if
2971 threads are stopped in a jump pad (or in its callee's). For
2974 - starting a new trace run. A thread still collecting the
2975 previous run, could trash the trace buffer when resumed. The trace
2976 buffer control structures would have been reset but the thread had
2977 no way to tell. The thread could even midway memcpy'ing to the
2978 buffer, which would mean that when resumed, it would clobber the
2979 trace buffer that had been set for a new run.
2981 - we can't rewrite/reuse the jump pads for new tracepoints
2982 safely. Say you do tstart while a thread is stopped midway while
2983 collecting. When the thread is later resumed, it finishes the
2984 collection, and returns to the jump pad, to execute the original
2985 instruction that was under the tracepoint jump at the time the
2986 older run had been started. If the jump pad had been rewritten
2987 since for something else in the new run, the thread would now
2988 execute the wrong / random instructions. */
2991 linux_stabilize_threads (void)
2993 thread_info
*thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
2995 if (thread_stuck
!= NULL
)
2998 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2999 lwpid_of (thread_stuck
));
3003 thread_info
*saved_thread
= current_thread
;
3005 stabilizing_threads
= 1;
3008 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
3010 /* Loop until all are stopped out of the jump pads. */
3011 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
3013 struct target_waitstatus ourstatus
;
3014 struct lwp_info
*lwp
;
3017 /* Note that we go through the full wait even loop. While
3018 moving threads out of jump pad, we need to be able to step
3019 over internal breakpoints and such. */
3020 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
3022 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
3024 lwp
= get_thread_lwp (current_thread
);
3027 lwp_suspended_inc (lwp
);
3029 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3030 || current_thread
->last_resume_kind
== resume_stop
)
3032 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3033 enqueue_one_deferred_signal (lwp
, &wstat
);
3038 unsuspend_all_lwps (NULL
);
3040 stabilizing_threads
= 0;
3042 current_thread
= saved_thread
;
3046 thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
3048 if (thread_stuck
!= NULL
)
3049 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3050 lwpid_of (thread_stuck
));
3054 /* Convenience function that is called when the kernel reports an
3055 event that is not passed out to GDB. */
3058 ignore_event (struct target_waitstatus
*ourstatus
)
3060 /* If we got an event, there may still be others, as a single
3061 SIGCHLD can indicate more than one child stopped. This forces
3062 another target_wait call. */
3065 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3069 /* Convenience function that is called when the kernel reports an exit
3070 event. This decides whether to report the event to GDB as a
3071 process exit event, a thread exit event, or to suppress the
3075 filter_exit_event (struct lwp_info
*event_child
,
3076 struct target_waitstatus
*ourstatus
)
3078 struct thread_info
*thread
= get_lwp_thread (event_child
);
3079 ptid_t ptid
= ptid_of (thread
);
3081 if (!last_thread_of_process_p (pid_of (thread
)))
3083 if (report_thread_events
)
3084 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3086 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3088 delete_lwp (event_child
);
3093 /* Returns 1 if GDB is interested in any event_child syscalls. */
3096 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3098 struct thread_info
*thread
= get_lwp_thread (event_child
);
3099 struct process_info
*proc
= get_thread_process (thread
);
3101 return !proc
->syscalls_to_catch
.empty ();
3104 /* Returns 1 if GDB is interested in the event_child syscall.
3105 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3108 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3111 struct thread_info
*thread
= get_lwp_thread (event_child
);
3112 struct process_info
*proc
= get_thread_process (thread
);
3114 if (proc
->syscalls_to_catch
.empty ())
3117 if (proc
->syscalls_to_catch
[0] == ANY_SYSCALL
)
3120 get_syscall_trapinfo (event_child
, &sysno
);
3122 for (int iter
: proc
->syscalls_to_catch
)
3129 /* Wait for process, returns status. */
3132 linux_wait_1 (ptid_t ptid
,
3133 struct target_waitstatus
*ourstatus
, int target_options
)
3136 struct lwp_info
*event_child
;
3139 int step_over_finished
;
3140 int bp_explains_trap
;
3141 int maybe_internal_trap
;
3150 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3153 /* Translate generic target options into linux options. */
3155 if (target_options
& TARGET_WNOHANG
)
3158 bp_explains_trap
= 0;
3161 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3163 auto status_pending_p_any
= [&] (thread_info
*thread
)
3165 return status_pending_p_callback (thread
, minus_one_ptid
);
3168 /* Find a resumed LWP, if any. */
3169 if (find_thread (status_pending_p_any
) != NULL
)
3171 else if ((find_inferior (&all_threads
,
3172 not_stopped_callback
,
3173 &minus_one_ptid
) != NULL
))
3178 if (ptid_equal (step_over_bkpt
, null_ptid
))
3179 pid
= linux_wait_for_event (ptid
, &w
, options
);
3183 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3184 target_pid_to_str (step_over_bkpt
));
3185 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3188 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3190 gdb_assert (target_options
& TARGET_WNOHANG
);
3194 debug_printf ("linux_wait_1 ret = null_ptid, "
3195 "TARGET_WAITKIND_IGNORE\n");
3199 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3206 debug_printf ("linux_wait_1 ret = null_ptid, "
3207 "TARGET_WAITKIND_NO_RESUMED\n");
3211 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3215 event_child
= get_thread_lwp (current_thread
);
3217 /* linux_wait_for_event only returns an exit status for the last
3218 child of a process. Report it. */
3219 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3223 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3224 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3228 debug_printf ("linux_wait_1 ret = %s, exited with "
3230 target_pid_to_str (ptid_of (current_thread
)),
3237 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3238 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3242 debug_printf ("linux_wait_1 ret = %s, terminated with "
3244 target_pid_to_str (ptid_of (current_thread
)),
3250 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3251 return filter_exit_event (event_child
, ourstatus
);
3253 return ptid_of (current_thread
);
3256 /* If step-over executes a breakpoint instruction, in the case of a
3257 hardware single step it means a gdb/gdbserver breakpoint had been
3258 planted on top of a permanent breakpoint, in the case of a software
3259 single step it may just mean that gdbserver hit the reinsert breakpoint.
3260 The PC has been adjusted by save_stop_reason to point at
3261 the breakpoint address.
3262 So in the case of the hardware single step advance the PC manually
3263 past the breakpoint and in the case of software single step advance only
3264 if it's not the single_step_breakpoint we are hitting.
3265 This avoids that a program would keep trapping a permanent breakpoint
3267 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3268 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3269 && (event_child
->stepping
3270 || !single_step_breakpoint_inserted_here (event_child
->stop_pc
)))
3272 int increment_pc
= 0;
3273 int breakpoint_kind
= 0;
3274 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3277 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3278 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3282 debug_printf ("step-over for %s executed software breakpoint\n",
3283 target_pid_to_str (ptid_of (current_thread
)));
3286 if (increment_pc
!= 0)
3288 struct regcache
*regcache
3289 = get_thread_regcache (current_thread
, 1);
3291 event_child
->stop_pc
+= increment_pc
;
3292 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3294 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3295 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3299 /* If this event was not handled before, and is not a SIGTRAP, we
3300 report it. SIGILL and SIGSEGV are also treated as traps in case
3301 a breakpoint is inserted at the current PC. If this target does
3302 not support internal breakpoints at all, we also report the
3303 SIGTRAP without further processing; it's of no concern to us. */
3305 = (supports_breakpoints ()
3306 && (WSTOPSIG (w
) == SIGTRAP
3307 || ((WSTOPSIG (w
) == SIGILL
3308 || WSTOPSIG (w
) == SIGSEGV
)
3309 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3311 if (maybe_internal_trap
)
3313 /* Handle anything that requires bookkeeping before deciding to
3314 report the event or continue waiting. */
3316 /* First check if we can explain the SIGTRAP with an internal
3317 breakpoint, or if we should possibly report the event to GDB.
3318 Do this before anything that may remove or insert a
3320 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3322 /* We have a SIGTRAP, possibly a step-over dance has just
3323 finished. If so, tweak the state machine accordingly,
3324 reinsert breakpoints and delete any single-step
3326 step_over_finished
= finish_step_over (event_child
);
3328 /* Now invoke the callbacks of any internal breakpoints there. */
3329 check_breakpoints (event_child
->stop_pc
);
3331 /* Handle tracepoint data collecting. This may overflow the
3332 trace buffer, and cause a tracing stop, removing
3334 trace_event
= handle_tracepoints (event_child
);
3336 if (bp_explains_trap
)
3339 debug_printf ("Hit a gdbserver breakpoint.\n");
3344 /* We have some other signal, possibly a step-over dance was in
3345 progress, and it should be cancelled too. */
3346 step_over_finished
= finish_step_over (event_child
);
3349 /* We have all the data we need. Either report the event to GDB, or
3350 resume threads and keep waiting for more. */
3352 /* If we're collecting a fast tracepoint, finish the collection and
3353 move out of the jump pad before delivering a signal. See
3354 linux_stabilize_threads. */
3357 && WSTOPSIG (w
) != SIGTRAP
3358 && supports_fast_tracepoints ()
3359 && agent_loaded_p ())
3362 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3363 "to defer or adjust it.\n",
3364 WSTOPSIG (w
), lwpid_of (current_thread
));
3366 /* Allow debugging the jump pad itself. */
3367 if (current_thread
->last_resume_kind
!= resume_step
3368 && maybe_move_out_of_jump_pad (event_child
, &w
))
3370 enqueue_one_deferred_signal (event_child
, &w
);
3373 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3374 WSTOPSIG (w
), lwpid_of (current_thread
));
3376 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3380 return ignore_event (ourstatus
);
3384 if (event_child
->collecting_fast_tracepoint
3385 != fast_tpoint_collect_result::not_collecting
)
3388 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3389 "Check if we're already there.\n",
3390 lwpid_of (current_thread
),
3391 (int) event_child
->collecting_fast_tracepoint
);
3395 event_child
->collecting_fast_tracepoint
3396 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3398 if (event_child
->collecting_fast_tracepoint
3399 != fast_tpoint_collect_result::before_insn
)
3401 /* No longer need this breakpoint. */
3402 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3405 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3406 "stopping all threads momentarily.\n");
3408 /* Other running threads could hit this breakpoint.
3409 We don't handle moribund locations like GDB does,
3410 instead we always pause all threads when removing
3411 breakpoints, so that any step-over or
3412 decr_pc_after_break adjustment is always taken
3413 care of while the breakpoint is still
3415 stop_all_lwps (1, event_child
);
3417 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3418 event_child
->exit_jump_pad_bkpt
= NULL
;
3420 unstop_all_lwps (1, event_child
);
3422 gdb_assert (event_child
->suspended
>= 0);
3426 if (event_child
->collecting_fast_tracepoint
3427 == fast_tpoint_collect_result::not_collecting
)
3430 debug_printf ("fast tracepoint finished "
3431 "collecting successfully.\n");
3433 /* We may have a deferred signal to report. */
3434 if (dequeue_one_deferred_signal (event_child
, &w
))
3437 debug_printf ("dequeued one signal.\n");
3442 debug_printf ("no deferred signals.\n");
3444 if (stabilizing_threads
)
3446 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3447 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3451 debug_printf ("linux_wait_1 ret = %s, stopped "
3452 "while stabilizing threads\n",
3453 target_pid_to_str (ptid_of (current_thread
)));
3457 return ptid_of (current_thread
);
3463 /* Check whether GDB would be interested in this event. */
3465 /* Check if GDB is interested in this syscall. */
3467 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3468 && !gdb_catch_this_syscall_p (event_child
))
3472 debug_printf ("Ignored syscall for LWP %ld.\n",
3473 lwpid_of (current_thread
));
3476 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3481 return ignore_event (ourstatus
);
3484 /* If GDB is not interested in this signal, don't stop other
3485 threads, and don't report it to GDB. Just resume the inferior
3486 right away. We do this for threading-related signals as well as
3487 any that GDB specifically requested we ignore. But never ignore
3488 SIGSTOP if we sent it ourselves, and do not ignore signals when
3489 stepping - they may require special handling to skip the signal
3490 handler. Also never ignore signals that could be caused by a
3493 && current_thread
->last_resume_kind
!= resume_step
3495 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3496 (current_process ()->priv
->thread_db
!= NULL
3497 && (WSTOPSIG (w
) == __SIGRTMIN
3498 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3501 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3502 && !(WSTOPSIG (w
) == SIGSTOP
3503 && current_thread
->last_resume_kind
== resume_stop
)
3504 && !linux_wstatus_maybe_breakpoint (w
))))
3506 siginfo_t info
, *info_p
;
3509 debug_printf ("Ignored signal %d for LWP %ld.\n",
3510 WSTOPSIG (w
), lwpid_of (current_thread
));
3512 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3513 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3518 if (step_over_finished
)
3520 /* We cancelled this thread's step-over above. We still
3521 need to unsuspend all other LWPs, and set them back
3522 running again while the signal handler runs. */
3523 unsuspend_all_lwps (event_child
);
3525 /* Enqueue the pending signal info so that proceed_all_lwps
3527 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3529 proceed_all_lwps ();
3533 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3534 WSTOPSIG (w
), info_p
);
3540 return ignore_event (ourstatus
);
3543 /* Note that all addresses are always "out of the step range" when
3544 there's no range to begin with. */
3545 in_step_range
= lwp_in_step_range (event_child
);
3547 /* If GDB wanted this thread to single step, and the thread is out
3548 of the step range, we always want to report the SIGTRAP, and let
3549 GDB handle it. Watchpoints should always be reported. So should
3550 signals we can't explain. A SIGTRAP we can't explain could be a
3551 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3552 do, we're be able to handle GDB breakpoints on top of internal
3553 breakpoints, by handling the internal breakpoint and still
3554 reporting the event to GDB. If we don't, we're out of luck, GDB
3555 won't see the breakpoint hit. If we see a single-step event but
3556 the thread should be continuing, don't pass the trap to gdb.
3557 That indicates that we had previously finished a single-step but
3558 left the single-step pending -- see
3559 complete_ongoing_step_over. */
3560 report_to_gdb
= (!maybe_internal_trap
3561 || (current_thread
->last_resume_kind
== resume_step
3563 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3565 && !bp_explains_trap
3567 && !step_over_finished
3568 && !(current_thread
->last_resume_kind
== resume_continue
3569 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3570 || (gdb_breakpoint_here (event_child
->stop_pc
)
3571 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3572 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3573 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3575 run_breakpoint_commands (event_child
->stop_pc
);
3577 /* We found no reason GDB would want us to stop. We either hit one
3578 of our own breakpoints, or finished an internal step GDB
3579 shouldn't know about. */
3584 if (bp_explains_trap
)
3585 debug_printf ("Hit a gdbserver breakpoint.\n");
3586 if (step_over_finished
)
3587 debug_printf ("Step-over finished.\n");
3589 debug_printf ("Tracepoint event.\n");
3590 if (lwp_in_step_range (event_child
))
3591 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3592 paddress (event_child
->stop_pc
),
3593 paddress (event_child
->step_range_start
),
3594 paddress (event_child
->step_range_end
));
3597 /* We're not reporting this breakpoint to GDB, so apply the
3598 decr_pc_after_break adjustment to the inferior's regcache
3601 if (the_low_target
.set_pc
!= NULL
)
3603 struct regcache
*regcache
3604 = get_thread_regcache (current_thread
, 1);
3605 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3608 if (step_over_finished
)
3610 /* If we have finished stepping over a breakpoint, we've
3611 stopped and suspended all LWPs momentarily except the
3612 stepping one. This is where we resume them all again.
3613 We're going to keep waiting, so use proceed, which
3614 handles stepping over the next breakpoint. */
3615 unsuspend_all_lwps (event_child
);
3619 /* Remove the single-step breakpoints if any. Note that
3620 there isn't single-step breakpoint if we finished stepping
3622 if (can_software_single_step ()
3623 && has_single_step_breakpoints (current_thread
))
3625 stop_all_lwps (0, event_child
);
3626 delete_single_step_breakpoints (current_thread
);
3627 unstop_all_lwps (0, event_child
);
3632 debug_printf ("proceeding all threads.\n");
3633 proceed_all_lwps ();
3638 return ignore_event (ourstatus
);
3643 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3646 = target_waitstatus_to_string (&event_child
->waitstatus
);
3648 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3649 lwpid_of (get_lwp_thread (event_child
)), str
.c_str ());
3651 if (current_thread
->last_resume_kind
== resume_step
)
3653 if (event_child
->step_range_start
== event_child
->step_range_end
)
3654 debug_printf ("GDB wanted to single-step, reporting event.\n");
3655 else if (!lwp_in_step_range (event_child
))
3656 debug_printf ("Out of step range, reporting event.\n");
3658 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3659 debug_printf ("Stopped by watchpoint.\n");
3660 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3661 debug_printf ("Stopped by GDB breakpoint.\n");
3663 debug_printf ("Hit a non-gdbserver trap event.\n");
3666 /* Alright, we're going to report a stop. */
3668 /* Remove single-step breakpoints. */
3669 if (can_software_single_step ())
3671 /* Remove single-step breakpoints or not. It it is true, stop all
3672 lwps, so that other threads won't hit the breakpoint in the
3674 int remove_single_step_breakpoints_p
= 0;
3678 remove_single_step_breakpoints_p
3679 = has_single_step_breakpoints (current_thread
);
3683 /* In all-stop, a stop reply cancels all previous resume
3684 requests. Delete all single-step breakpoints. */
3686 find_thread ([&] (thread_info
*thread
) {
3687 if (has_single_step_breakpoints (thread
))
3689 remove_single_step_breakpoints_p
= 1;
3697 if (remove_single_step_breakpoints_p
)
3699 /* If we remove single-step breakpoints from memory, stop all lwps,
3700 so that other threads won't hit the breakpoint in the staled
3702 stop_all_lwps (0, event_child
);
3706 gdb_assert (has_single_step_breakpoints (current_thread
));
3707 delete_single_step_breakpoints (current_thread
);
3711 for_each_thread ([] (thread_info
*thread
){
3712 if (has_single_step_breakpoints (thread
))
3713 delete_single_step_breakpoints (thread
);
3717 unstop_all_lwps (0, event_child
);
3721 if (!stabilizing_threads
)
3723 /* In all-stop, stop all threads. */
3725 stop_all_lwps (0, NULL
);
3727 if (step_over_finished
)
3731 /* If we were doing a step-over, all other threads but
3732 the stepping one had been paused in start_step_over,
3733 with their suspend counts incremented. We don't want
3734 to do a full unstop/unpause, because we're in
3735 all-stop mode (so we want threads stopped), but we
3736 still need to unsuspend the other threads, to
3737 decrement their `suspended' count back. */
3738 unsuspend_all_lwps (event_child
);
3742 /* If we just finished a step-over, then all threads had
3743 been momentarily paused. In all-stop, that's fine,
3744 we want threads stopped by now anyway. In non-stop,
3745 we need to re-resume threads that GDB wanted to be
3747 unstop_all_lwps (1, event_child
);
3751 /* If we're not waiting for a specific LWP, choose an event LWP
3752 from among those that have had events. Giving equal priority
3753 to all LWPs that have had events helps prevent
3755 if (ptid_equal (ptid
, minus_one_ptid
))
3757 event_child
->status_pending_p
= 1;
3758 event_child
->status_pending
= w
;
3760 select_event_lwp (&event_child
);
3762 /* current_thread and event_child must stay in sync. */
3763 current_thread
= get_lwp_thread (event_child
);
3765 event_child
->status_pending_p
= 0;
3766 w
= event_child
->status_pending
;
3770 /* Stabilize threads (move out of jump pads). */
3772 stabilize_threads ();
3776 /* If we just finished a step-over, then all threads had been
3777 momentarily paused. In all-stop, that's fine, we want
3778 threads stopped by now anyway. In non-stop, we need to
3779 re-resume threads that GDB wanted to be running. */
3780 if (step_over_finished
)
3781 unstop_all_lwps (1, event_child
);
3784 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3786 /* If the reported event is an exit, fork, vfork or exec, let
3789 /* Break the unreported fork relationship chain. */
3790 if (event_child
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
3791 || event_child
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
)
3793 event_child
->fork_relative
->fork_relative
= NULL
;
3794 event_child
->fork_relative
= NULL
;
3797 *ourstatus
= event_child
->waitstatus
;
3798 /* Clear the event lwp's waitstatus since we handled it already. */
3799 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3802 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3804 /* Now that we've selected our final event LWP, un-adjust its PC if
3805 it was a software breakpoint, and the client doesn't know we can
3806 adjust the breakpoint ourselves. */
3807 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3808 && !swbreak_feature
)
3810 int decr_pc
= the_low_target
.decr_pc_after_break
;
3814 struct regcache
*regcache
3815 = get_thread_regcache (current_thread
, 1);
3816 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3820 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3822 get_syscall_trapinfo (event_child
,
3823 &ourstatus
->value
.syscall_number
);
3824 ourstatus
->kind
= event_child
->syscall_state
;
3826 else if (current_thread
->last_resume_kind
== resume_stop
3827 && WSTOPSIG (w
) == SIGSTOP
)
3829 /* A thread that has been requested to stop by GDB with vCont;t,
3830 and it stopped cleanly, so report as SIG0. The use of
3831 SIGSTOP is an implementation detail. */
3832 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3834 else if (current_thread
->last_resume_kind
== resume_stop
3835 && WSTOPSIG (w
) != SIGSTOP
)
3837 /* A thread that has been requested to stop by GDB with vCont;t,
3838 but, it stopped for other reasons. */
3839 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3841 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3843 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3846 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3850 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3851 target_pid_to_str (ptid_of (current_thread
)),
3852 ourstatus
->kind
, ourstatus
->value
.sig
);
3856 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3857 return filter_exit_event (event_child
, ourstatus
);
3859 return ptid_of (current_thread
);
3862 /* Get rid of any pending event in the pipe. */
3864 async_file_flush (void)
3870 ret
= read (linux_event_pipe
[0], &buf
, 1);
3871 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3874 /* Put something in the pipe, so the event loop wakes up. */
3876 async_file_mark (void)
3880 async_file_flush ();
3883 ret
= write (linux_event_pipe
[1], "+", 1);
3884 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3886 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3887 be awakened anyway. */
3891 linux_wait (ptid_t ptid
,
3892 struct target_waitstatus
*ourstatus
, int target_options
)
3896 /* Flush the async file first. */
3897 if (target_is_async_p ())
3898 async_file_flush ();
3902 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3904 while ((target_options
& TARGET_WNOHANG
) == 0
3905 && ptid_equal (event_ptid
, null_ptid
)
3906 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3908 /* If at least one stop was reported, there may be more. A single
3909 SIGCHLD can signal more than one child stop. */
3910 if (target_is_async_p ()
3911 && (target_options
& TARGET_WNOHANG
) != 0
3912 && !ptid_equal (event_ptid
, null_ptid
))
3918 /* Send a signal to an LWP. */
3921 kill_lwp (unsigned long lwpid
, int signo
)
3926 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3927 if (errno
== ENOSYS
)
3929 /* If tkill fails, then we are not using nptl threads, a
3930 configuration we no longer support. */
3931 perror_with_name (("tkill"));
3937 linux_stop_lwp (struct lwp_info
*lwp
)
3943 send_sigstop (struct lwp_info
*lwp
)
3947 pid
= lwpid_of (get_lwp_thread (lwp
));
3949 /* If we already have a pending stop signal for this process, don't
3951 if (lwp
->stop_expected
)
3954 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3960 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3962 lwp
->stop_expected
= 1;
3963 kill_lwp (pid
, SIGSTOP
);
3967 send_sigstop_callback (thread_info
*thread
, void *except
)
3969 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3971 /* Ignore EXCEPT. */
3982 /* Increment the suspend count of an LWP, and stop it, if not stopped
3985 suspend_and_send_sigstop_callback (thread_info
*thread
, void *except
)
3987 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3989 /* Ignore EXCEPT. */
3993 lwp_suspended_inc (lwp
);
3995 return send_sigstop_callback (thread
, except
);
3999 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
4001 /* Store the exit status for later. */
4002 lwp
->status_pending_p
= 1;
4003 lwp
->status_pending
= wstat
;
4005 /* Store in waitstatus as well, as there's nothing else to process
4007 if (WIFEXITED (wstat
))
4009 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
4010 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
4012 else if (WIFSIGNALED (wstat
))
4014 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
4015 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
4018 /* Prevent trying to stop it. */
4021 /* No further stops are expected from a dead lwp. */
4022 lwp
->stop_expected
= 0;
4025 /* Return true if LWP has exited already, and has a pending exit event
4026 to report to GDB. */
4029 lwp_is_marked_dead (struct lwp_info
*lwp
)
4031 return (lwp
->status_pending_p
4032 && (WIFEXITED (lwp
->status_pending
)
4033 || WIFSIGNALED (lwp
->status_pending
)));
4036 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4039 wait_for_sigstop (void)
4041 struct thread_info
*saved_thread
;
4046 saved_thread
= current_thread
;
4047 if (saved_thread
!= NULL
)
4048 saved_tid
= saved_thread
->id
;
4050 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4053 debug_printf ("wait_for_sigstop: pulling events\n");
4055 /* Passing NULL_PTID as filter indicates we want all events to be
4056 left pending. Eventually this returns when there are no
4057 unwaited-for children left. */
4058 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4060 gdb_assert (ret
== -1);
4062 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4063 current_thread
= saved_thread
;
4067 debug_printf ("Previously current thread died.\n");
4069 /* We can't change the current inferior behind GDB's back,
4070 otherwise, a subsequent command may apply to the wrong
4072 current_thread
= NULL
;
4076 /* Returns true if THREAD is stopped in a jump pad, and we can't
4077 move it out, because we need to report the stop event to GDB. For
4078 example, if the user puts a breakpoint in the jump pad, it's
4079 because she wants to debug it. */
4082 stuck_in_jump_pad_callback (thread_info
*thread
)
4084 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4086 if (lwp
->suspended
!= 0)
4088 internal_error (__FILE__
, __LINE__
,
4089 "LWP %ld is suspended, suspended=%d\n",
4090 lwpid_of (thread
), lwp
->suspended
);
4092 gdb_assert (lwp
->stopped
);
4094 /* Allow debugging the jump pad, gdb_collect, etc.. */
4095 return (supports_fast_tracepoints ()
4096 && agent_loaded_p ()
4097 && (gdb_breakpoint_here (lwp
->stop_pc
)
4098 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4099 || thread
->last_resume_kind
== resume_step
)
4100 && (linux_fast_tracepoint_collecting (lwp
, NULL
)
4101 != fast_tpoint_collect_result::not_collecting
));
4105 move_out_of_jump_pad_callback (thread_info
*thread
)
4107 struct thread_info
*saved_thread
;
4108 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4111 if (lwp
->suspended
!= 0)
4113 internal_error (__FILE__
, __LINE__
,
4114 "LWP %ld is suspended, suspended=%d\n",
4115 lwpid_of (thread
), lwp
->suspended
);
4117 gdb_assert (lwp
->stopped
);
4119 /* For gdb_breakpoint_here. */
4120 saved_thread
= current_thread
;
4121 current_thread
= thread
;
4123 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4125 /* Allow debugging the jump pad, gdb_collect, etc. */
4126 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4127 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4128 && thread
->last_resume_kind
!= resume_step
4129 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4132 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4137 lwp
->status_pending_p
= 0;
4138 enqueue_one_deferred_signal (lwp
, wstat
);
4141 debug_printf ("Signal %d for LWP %ld deferred "
4143 WSTOPSIG (*wstat
), lwpid_of (thread
));
4146 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4149 lwp_suspended_inc (lwp
);
4151 current_thread
= saved_thread
;
4155 lwp_running (thread_info
*thread
, void *data
)
4157 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4159 if (lwp_is_marked_dead (lwp
))
4166 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4167 If SUSPEND, then also increase the suspend count of every LWP,
4171 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4173 /* Should not be called recursively. */
4174 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4179 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4180 suspend
? "stop-and-suspend" : "stop",
4182 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4186 stopping_threads
= (suspend
4187 ? STOPPING_AND_SUSPENDING_THREADS
4188 : STOPPING_THREADS
);
4191 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
4193 find_inferior (&all_threads
, send_sigstop_callback
, except
);
4194 wait_for_sigstop ();
4195 stopping_threads
= NOT_STOPPING_THREADS
;
4199 debug_printf ("stop_all_lwps done, setting stopping_threads "
4200 "back to !stopping\n");
4205 /* Enqueue one signal in the chain of signals which need to be
4206 delivered to this process on next resume. */
4209 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4211 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4213 p_sig
->prev
= lwp
->pending_signals
;
4214 p_sig
->signal
= signal
;
4216 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4218 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4219 lwp
->pending_signals
= p_sig
;
4222 /* Install breakpoints for software single stepping. */
4225 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4227 struct thread_info
*thread
= get_lwp_thread (lwp
);
4228 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4229 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
4231 current_thread
= thread
;
4232 std::vector
<CORE_ADDR
> next_pcs
= the_low_target
.get_next_pcs (regcache
);
4234 for (CORE_ADDR pc
: next_pcs
)
4235 set_single_step_breakpoint (pc
, current_ptid
);
4237 do_cleanups (old_chain
);
4240 /* Single step via hardware or software single step.
4241 Return 1 if hardware single stepping, 0 if software single stepping
4242 or can't single step. */
4245 single_step (struct lwp_info
* lwp
)
4249 if (can_hardware_single_step ())
4253 else if (can_software_single_step ())
4255 install_software_single_step_breakpoints (lwp
);
4261 debug_printf ("stepping is not implemented on this target");
4267 /* The signal can be delivered to the inferior if we are not trying to
4268 finish a fast tracepoint collect. Since signal can be delivered in
4269 the step-over, the program may go to signal handler and trap again
4270 after return from the signal handler. We can live with the spurious
4274 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4276 return (lwp
->collecting_fast_tracepoint
4277 == fast_tpoint_collect_result::not_collecting
);
4280 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4281 SIGNAL is nonzero, give it that signal. */
4284 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4285 int step
, int signal
, siginfo_t
*info
)
4287 struct thread_info
*thread
= get_lwp_thread (lwp
);
4288 struct thread_info
*saved_thread
;
4290 struct process_info
*proc
= get_thread_process (thread
);
4292 /* Note that target description may not be initialised
4293 (proc->tdesc == NULL) at this point because the program hasn't
4294 stopped at the first instruction yet. It means GDBserver skips
4295 the extra traps from the wrapper program (see option --wrapper).
4296 Code in this function that requires register access should be
4297 guarded by proc->tdesc == NULL or something else. */
4299 if (lwp
->stopped
== 0)
4302 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4304 fast_tpoint_collect_result fast_tp_collecting
4305 = lwp
->collecting_fast_tracepoint
;
4307 gdb_assert (!stabilizing_threads
4308 || (fast_tp_collecting
4309 != fast_tpoint_collect_result::not_collecting
));
4311 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4312 user used the "jump" command, or "set $pc = foo"). */
4313 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4315 /* Collecting 'while-stepping' actions doesn't make sense
4317 release_while_stepping_state_list (thread
);
4320 /* If we have pending signals or status, and a new signal, enqueue the
4321 signal. Also enqueue the signal if it can't be delivered to the
4322 inferior right now. */
4324 && (lwp
->status_pending_p
4325 || lwp
->pending_signals
!= NULL
4326 || !lwp_signal_can_be_delivered (lwp
)))
4328 enqueue_pending_signal (lwp
, signal
, info
);
4330 /* Postpone any pending signal. It was enqueued above. */
4334 if (lwp
->status_pending_p
)
4337 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4338 " has pending status\n",
4339 lwpid_of (thread
), step
? "step" : "continue",
4340 lwp
->stop_expected
? "expected" : "not expected");
4344 saved_thread
= current_thread
;
4345 current_thread
= thread
;
4347 /* This bit needs some thinking about. If we get a signal that
4348 we must report while a single-step reinsert is still pending,
4349 we often end up resuming the thread. It might be better to
4350 (ew) allow a stack of pending events; then we could be sure that
4351 the reinsert happened right away and not lose any signals.
4353 Making this stack would also shrink the window in which breakpoints are
4354 uninserted (see comment in linux_wait_for_lwp) but not enough for
4355 complete correctness, so it won't solve that problem. It may be
4356 worthwhile just to solve this one, however. */
4357 if (lwp
->bp_reinsert
!= 0)
4360 debug_printf (" pending reinsert at 0x%s\n",
4361 paddress (lwp
->bp_reinsert
));
4363 if (can_hardware_single_step ())
4365 if (fast_tp_collecting
== fast_tpoint_collect_result::not_collecting
)
4368 warning ("BAD - reinserting but not stepping.");
4370 warning ("BAD - reinserting and suspended(%d).",
4375 step
= maybe_hw_step (thread
);
4378 if (fast_tp_collecting
== fast_tpoint_collect_result::before_insn
)
4381 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4382 " (exit-jump-pad-bkpt)\n",
4385 else if (fast_tp_collecting
== fast_tpoint_collect_result::at_insn
)
4388 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4389 " single-stepping\n",
4392 if (can_hardware_single_step ())
4396 internal_error (__FILE__
, __LINE__
,
4397 "moving out of jump pad single-stepping"
4398 " not implemented on this target");
4402 /* If we have while-stepping actions in this thread set it stepping.
4403 If we have a signal to deliver, it may or may not be set to
4404 SIG_IGN, we don't know. Assume so, and allow collecting
4405 while-stepping into a signal handler. A possible smart thing to
4406 do would be to set an internal breakpoint at the signal return
4407 address, continue, and carry on catching this while-stepping
4408 action only when that breakpoint is hit. A future
4410 if (thread
->while_stepping
!= NULL
)
4413 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4416 step
= single_step (lwp
);
4419 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4421 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4423 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4427 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4428 (long) lwp
->stop_pc
);
4432 /* If we have pending signals, consume one if it can be delivered to
4434 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4436 struct pending_signals
**p_sig
;
4438 p_sig
= &lwp
->pending_signals
;
4439 while ((*p_sig
)->prev
!= NULL
)
4440 p_sig
= &(*p_sig
)->prev
;
4442 signal
= (*p_sig
)->signal
;
4443 if ((*p_sig
)->info
.si_signo
!= 0)
4444 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4452 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4453 lwpid_of (thread
), step
? "step" : "continue", signal
,
4454 lwp
->stop_expected
? "expected" : "not expected");
4456 if (the_low_target
.prepare_to_resume
!= NULL
)
4457 the_low_target
.prepare_to_resume (lwp
);
4459 regcache_invalidate_thread (thread
);
4461 lwp
->stepping
= step
;
4463 ptrace_request
= PTRACE_SINGLESTEP
;
4464 else if (gdb_catching_syscalls_p (lwp
))
4465 ptrace_request
= PTRACE_SYSCALL
;
4467 ptrace_request
= PTRACE_CONT
;
4468 ptrace (ptrace_request
,
4470 (PTRACE_TYPE_ARG3
) 0,
4471 /* Coerce to a uintptr_t first to avoid potential gcc warning
4472 of coercing an 8 byte integer to a 4 byte pointer. */
4473 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4475 current_thread
= saved_thread
;
4477 perror_with_name ("resuming thread");
4479 /* Successfully resumed. Clear state that no longer makes sense,
4480 and mark the LWP as running. Must not do this before resuming
4481 otherwise if that fails other code will be confused. E.g., we'd
4482 later try to stop the LWP and hang forever waiting for a stop
4483 status. Note that we must not throw after this is cleared,
4484 otherwise handle_zombie_lwp_error would get confused. */
4486 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4489 /* Called when we try to resume a stopped LWP and that errors out. If
4490 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4491 or about to become), discard the error, clear any pending status
4492 the LWP may have, and return true (we'll collect the exit status
4493 soon enough). Otherwise, return false. */
4496 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4498 struct thread_info
*thread
= get_lwp_thread (lp
);
4500 /* If we get an error after resuming the LWP successfully, we'd
4501 confuse !T state for the LWP being gone. */
4502 gdb_assert (lp
->stopped
);
4504 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4505 because even if ptrace failed with ESRCH, the tracee may be "not
4506 yet fully dead", but already refusing ptrace requests. In that
4507 case the tracee has 'R (Running)' state for a little bit
4508 (observed in Linux 3.18). See also the note on ESRCH in the
4509 ptrace(2) man page. Instead, check whether the LWP has any state
4510 other than ptrace-stopped. */
4512 /* Don't assume anything if /proc/PID/status can't be read. */
4513 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4515 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4516 lp
->status_pending_p
= 0;
4522 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4523 disappears while we try to resume it. */
4526 linux_resume_one_lwp (struct lwp_info
*lwp
,
4527 int step
, int signal
, siginfo_t
*info
)
4531 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4533 CATCH (ex
, RETURN_MASK_ERROR
)
4535 if (!check_ptrace_stopped_lwp_gone (lwp
))
4536 throw_exception (ex
);
4541 /* This function is called once per thread via for_each_thread.
4542 We look up which resume request applies to THREAD and mark it with a
4543 pointer to the appropriate resume request.
4545 This algorithm is O(threads * resume elements), but resume elements
4546 is small (and will remain small at least until GDB supports thread
4550 linux_set_resume_request (thread_info
*thread
, thread_resume
*resume
, size_t n
)
4552 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4554 for (int ndx
= 0; ndx
< n
; ndx
++)
4556 ptid_t ptid
= resume
[ndx
].thread
;
4557 if (ptid_equal (ptid
, minus_one_ptid
)
4558 || ptid
== thread
->id
4559 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4561 || (ptid_get_pid (ptid
) == pid_of (thread
)
4562 && (ptid_is_pid (ptid
)
4563 || ptid_get_lwp (ptid
) == -1)))
4565 if (resume
[ndx
].kind
== resume_stop
4566 && thread
->last_resume_kind
== resume_stop
)
4569 debug_printf ("already %s LWP %ld at GDB's request\n",
4570 (thread
->last_status
.kind
4571 == TARGET_WAITKIND_STOPPED
)
4579 /* Ignore (wildcard) resume requests for already-resumed
4581 if (resume
[ndx
].kind
!= resume_stop
4582 && thread
->last_resume_kind
!= resume_stop
)
4585 debug_printf ("already %s LWP %ld at GDB's request\n",
4586 (thread
->last_resume_kind
4594 /* Don't let wildcard resumes resume fork children that GDB
4595 does not yet know are new fork children. */
4596 if (lwp
->fork_relative
!= NULL
)
4598 struct lwp_info
*rel
= lwp
->fork_relative
;
4600 if (rel
->status_pending_p
4601 && (rel
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
4602 || rel
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
))
4605 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4611 /* If the thread has a pending event that has already been
4612 reported to GDBserver core, but GDB has not pulled the
4613 event out of the vStopped queue yet, likewise, ignore the
4614 (wildcard) resume request. */
4615 if (in_queued_stop_replies (thread
->id
))
4618 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4623 lwp
->resume
= &resume
[ndx
];
4624 thread
->last_resume_kind
= lwp
->resume
->kind
;
4626 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4627 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4629 /* If we had a deferred signal to report, dequeue one now.
4630 This can happen if LWP gets more than one signal while
4631 trying to get out of a jump pad. */
4633 && !lwp
->status_pending_p
4634 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4636 lwp
->status_pending_p
= 1;
4639 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4640 "leaving status pending.\n",
4641 WSTOPSIG (lwp
->status_pending
),
4649 /* No resume action for this thread. */
4653 /* find_inferior callback for linux_resume.
4654 Set *FLAG_P if this lwp has an interesting status pending. */
4657 resume_status_pending_p (thread_info
*thread
)
4659 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4661 /* LWPs which will not be resumed are not interesting, because
4662 we might not wait for them next time through linux_wait. */
4663 if (lwp
->resume
== NULL
)
4666 return thread_still_has_status_pending_p (thread
);
4669 /* Return 1 if this lwp that GDB wants running is stopped at an
4670 internal breakpoint that we need to step over. It assumes that any
4671 required STOP_PC adjustment has already been propagated to the
4672 inferior's regcache. */
4675 need_step_over_p (thread_info
*thread
)
4677 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4678 struct thread_info
*saved_thread
;
4680 struct process_info
*proc
= get_thread_process (thread
);
4682 /* GDBserver is skipping the extra traps from the wrapper program,
4683 don't have to do step over. */
4684 if (proc
->tdesc
== NULL
)
4687 /* LWPs which will not be resumed are not interesting, because we
4688 might not wait for them next time through linux_wait. */
4693 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4698 if (thread
->last_resume_kind
== resume_stop
)
4701 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4707 gdb_assert (lwp
->suspended
>= 0);
4712 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4717 if (lwp
->status_pending_p
)
4720 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4726 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4730 /* If the PC has changed since we stopped, then don't do anything,
4731 and let the breakpoint/tracepoint be hit. This happens if, for
4732 instance, GDB handled the decr_pc_after_break subtraction itself,
4733 GDB is OOL stepping this thread, or the user has issued a "jump"
4734 command, or poked thread's registers herself. */
4735 if (pc
!= lwp
->stop_pc
)
4738 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4739 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4741 paddress (lwp
->stop_pc
), paddress (pc
));
4745 /* On software single step target, resume the inferior with signal
4746 rather than stepping over. */
4747 if (can_software_single_step ()
4748 && lwp
->pending_signals
!= NULL
4749 && lwp_signal_can_be_delivered (lwp
))
4752 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4759 saved_thread
= current_thread
;
4760 current_thread
= thread
;
4762 /* We can only step over breakpoints we know about. */
4763 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4765 /* Don't step over a breakpoint that GDB expects to hit
4766 though. If the condition is being evaluated on the target's side
4767 and it evaluate to false, step over this breakpoint as well. */
4768 if (gdb_breakpoint_here (pc
)
4769 && gdb_condition_true_at_breakpoint (pc
)
4770 && gdb_no_commands_at_breakpoint (pc
))
4773 debug_printf ("Need step over [LWP %ld]? yes, but found"
4774 " GDB breakpoint at 0x%s; skipping step over\n",
4775 lwpid_of (thread
), paddress (pc
));
4777 current_thread
= saved_thread
;
4783 debug_printf ("Need step over [LWP %ld]? yes, "
4784 "found breakpoint at 0x%s\n",
4785 lwpid_of (thread
), paddress (pc
));
4787 /* We've found an lwp that needs stepping over --- return 1 so
4788 that find_inferior stops looking. */
4789 current_thread
= saved_thread
;
4795 current_thread
= saved_thread
;
4798 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4800 lwpid_of (thread
), paddress (pc
));
4805 /* Start a step-over operation on LWP. When LWP stopped at a
4806 breakpoint, to make progress, we need to remove the breakpoint out
4807 of the way. If we let other threads run while we do that, they may
4808 pass by the breakpoint location and miss hitting it. To avoid
4809 that, a step-over momentarily stops all threads while LWP is
4810 single-stepped by either hardware or software while the breakpoint
4811 is temporarily uninserted from the inferior. When the single-step
4812 finishes, we reinsert the breakpoint, and let all threads that are
4813 supposed to be running, run again. */
4816 start_step_over (struct lwp_info
*lwp
)
4818 struct thread_info
*thread
= get_lwp_thread (lwp
);
4819 struct thread_info
*saved_thread
;
4824 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4827 stop_all_lwps (1, lwp
);
4829 if (lwp
->suspended
!= 0)
4831 internal_error (__FILE__
, __LINE__
,
4832 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4837 debug_printf ("Done stopping all threads for step-over.\n");
4839 /* Note, we should always reach here with an already adjusted PC,
4840 either by GDB (if we're resuming due to GDB's request), or by our
4841 caller, if we just finished handling an internal breakpoint GDB
4842 shouldn't care about. */
4845 saved_thread
= current_thread
;
4846 current_thread
= thread
;
4848 lwp
->bp_reinsert
= pc
;
4849 uninsert_breakpoints_at (pc
);
4850 uninsert_fast_tracepoint_jumps_at (pc
);
4852 step
= single_step (lwp
);
4854 current_thread
= saved_thread
;
4856 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4858 /* Require next event from this LWP. */
4859 step_over_bkpt
= thread
->id
;
4863 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4864 start_step_over, if still there, and delete any single-step
4865 breakpoints we've set, on non hardware single-step targets. */
4868 finish_step_over (struct lwp_info
*lwp
)
4870 if (lwp
->bp_reinsert
!= 0)
4872 struct thread_info
*saved_thread
= current_thread
;
4875 debug_printf ("Finished step over.\n");
4877 current_thread
= get_lwp_thread (lwp
);
4879 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4880 may be no breakpoint to reinsert there by now. */
4881 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4882 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4884 lwp
->bp_reinsert
= 0;
4886 /* Delete any single-step breakpoints. No longer needed. We
4887 don't have to worry about other threads hitting this trap,
4888 and later not being able to explain it, because we were
4889 stepping over a breakpoint, and we hold all threads but
4890 LWP stopped while doing that. */
4891 if (!can_hardware_single_step ())
4893 gdb_assert (has_single_step_breakpoints (current_thread
));
4894 delete_single_step_breakpoints (current_thread
);
4897 step_over_bkpt
= null_ptid
;
4898 current_thread
= saved_thread
;
4905 /* If there's a step over in progress, wait until all threads stop
4906 (that is, until the stepping thread finishes its step), and
4907 unsuspend all lwps. The stepping thread ends with its status
4908 pending, which is processed later when we get back to processing
4912 complete_ongoing_step_over (void)
4914 if (!ptid_equal (step_over_bkpt
, null_ptid
))
4916 struct lwp_info
*lwp
;
4921 debug_printf ("detach: step over in progress, finish it first\n");
4923 /* Passing NULL_PTID as filter indicates we want all events to
4924 be left pending. Eventually this returns when there are no
4925 unwaited-for children left. */
4926 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4928 gdb_assert (ret
== -1);
4930 lwp
= find_lwp_pid (step_over_bkpt
);
4932 finish_step_over (lwp
);
4933 step_over_bkpt
= null_ptid
;
4934 unsuspend_all_lwps (lwp
);
4938 /* This function is called once per thread. We check the thread's resume
4939 request, which will tell us whether to resume, step, or leave the thread
4940 stopped; and what signal, if any, it should be sent.
4942 For threads which we aren't explicitly told otherwise, we preserve
4943 the stepping flag; this is used for stepping over gdbserver-placed
4946 If pending_flags was set in any thread, we queue any needed
4947 signals, since we won't actually resume. We already have a pending
4948 event to report, so we don't need to preserve any step requests;
4949 they should be re-issued if necessary. */
4952 linux_resume_one_thread (thread_info
*thread
, void *arg
)
4954 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4955 int leave_all_stopped
= * (int *) arg
;
4958 if (lwp
->resume
== NULL
)
4961 if (lwp
->resume
->kind
== resume_stop
)
4964 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4969 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
4971 /* Stop the thread, and wait for the event asynchronously,
4972 through the event loop. */
4978 debug_printf ("already stopped LWP %ld\n",
4981 /* The LWP may have been stopped in an internal event that
4982 was not meant to be notified back to GDB (e.g., gdbserver
4983 breakpoint), so we should be reporting a stop event in
4986 /* If the thread already has a pending SIGSTOP, this is a
4987 no-op. Otherwise, something later will presumably resume
4988 the thread and this will cause it to cancel any pending
4989 operation, due to last_resume_kind == resume_stop. If
4990 the thread already has a pending status to report, we
4991 will still report it the next time we wait - see
4992 status_pending_p_callback. */
4994 /* If we already have a pending signal to report, then
4995 there's no need to queue a SIGSTOP, as this means we're
4996 midway through moving the LWP out of the jumppad, and we
4997 will report the pending signal as soon as that is
4999 if (lwp
->pending_signals_to_report
== NULL
)
5003 /* For stop requests, we're done. */
5005 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5009 /* If this thread which is about to be resumed has a pending status,
5010 then don't resume it - we can just report the pending status.
5011 Likewise if it is suspended, because e.g., another thread is
5012 stepping past a breakpoint. Make sure to queue any signals that
5013 would otherwise be sent. In all-stop mode, we do this decision
5014 based on if *any* thread has a pending status. If there's a
5015 thread that needs the step-over-breakpoint dance, then don't
5016 resume any other thread but that particular one. */
5017 leave_pending
= (lwp
->suspended
5018 || lwp
->status_pending_p
5019 || leave_all_stopped
);
5021 /* If we have a new signal, enqueue the signal. */
5022 if (lwp
->resume
->sig
!= 0)
5024 siginfo_t info
, *info_p
;
5026 /* If this is the same signal we were previously stopped by,
5027 make sure to queue its siginfo. */
5028 if (WIFSTOPPED (lwp
->last_status
)
5029 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
5030 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
5031 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
5036 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
5042 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
5044 proceed_one_lwp (thread
, NULL
);
5049 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5052 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5058 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5060 struct thread_info
*need_step_over
= NULL
;
5061 int leave_all_stopped
;
5066 debug_printf ("linux_resume:\n");
5069 for_each_thread ([&] (thread_info
*thread
)
5071 linux_set_resume_request (thread
, resume_info
, n
);
5074 /* If there is a thread which would otherwise be resumed, which has
5075 a pending status, then don't resume any threads - we can just
5076 report the pending status. Make sure to queue any signals that
5077 would otherwise be sent. In non-stop mode, we'll apply this
5078 logic to each thread individually. We consume all pending events
5079 before considering to start a step-over (in all-stop). */
5080 bool any_pending
= false;
5082 any_pending
= find_thread (resume_status_pending_p
) != NULL
;
5084 /* If there is a thread which would otherwise be resumed, which is
5085 stopped at a breakpoint that needs stepping over, then don't
5086 resume any threads - have it step over the breakpoint with all
5087 other threads stopped, then resume all threads again. Make sure
5088 to queue any signals that would otherwise be delivered or
5090 if (!any_pending
&& supports_breakpoints ())
5091 need_step_over
= find_thread (need_step_over_p
);
5093 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5097 if (need_step_over
!= NULL
)
5098 debug_printf ("Not resuming all, need step over\n");
5099 else if (any_pending
)
5100 debug_printf ("Not resuming, all-stop and found "
5101 "an LWP with pending status\n");
5103 debug_printf ("Resuming, no pending status or step over needed\n");
5106 /* Even if we're leaving threads stopped, queue all signals we'd
5107 otherwise deliver. */
5108 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
5111 start_step_over (get_thread_lwp (need_step_over
));
5115 debug_printf ("linux_resume done\n");
5119 /* We may have events that were pending that can/should be sent to
5120 the client now. Trigger a linux_wait call. */
5121 if (target_is_async_p ())
5125 /* This function is called once per thread. We check the thread's
5126 last resume request, which will tell us whether to resume, step, or
5127 leave the thread stopped. Any signal the client requested to be
5128 delivered has already been enqueued at this point.
5130 If any thread that GDB wants running is stopped at an internal
5131 breakpoint that needs stepping over, we start a step-over operation
5132 on that particular thread, and leave all others stopped. */
5135 proceed_one_lwp (thread_info
*thread
, void *except
)
5137 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5144 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5149 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5153 if (thread
->last_resume_kind
== resume_stop
5154 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5157 debug_printf (" client wants LWP to remain %ld stopped\n",
5162 if (lwp
->status_pending_p
)
5165 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5170 gdb_assert (lwp
->suspended
>= 0);
5175 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5179 if (thread
->last_resume_kind
== resume_stop
5180 && lwp
->pending_signals_to_report
== NULL
5181 && (lwp
->collecting_fast_tracepoint
5182 == fast_tpoint_collect_result::not_collecting
))
5184 /* We haven't reported this LWP as stopped yet (otherwise, the
5185 last_status.kind check above would catch it, and we wouldn't
5186 reach here. This LWP may have been momentarily paused by a
5187 stop_all_lwps call while handling for example, another LWP's
5188 step-over. In that case, the pending expected SIGSTOP signal
5189 that was queued at vCont;t handling time will have already
5190 been consumed by wait_for_sigstop, and so we need to requeue
5191 another one here. Note that if the LWP already has a SIGSTOP
5192 pending, this is a no-op. */
5195 debug_printf ("Client wants LWP %ld to stop. "
5196 "Making sure it has a SIGSTOP pending\n",
5202 if (thread
->last_resume_kind
== resume_step
)
5205 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5208 /* If resume_step is requested by GDB, install single-step
5209 breakpoints when the thread is about to be actually resumed if
5210 the single-step breakpoints weren't removed. */
5211 if (can_software_single_step ()
5212 && !has_single_step_breakpoints (thread
))
5213 install_software_single_step_breakpoints (lwp
);
5215 step
= maybe_hw_step (thread
);
5217 else if (lwp
->bp_reinsert
!= 0)
5220 debug_printf (" stepping LWP %ld, reinsert set\n",
5223 step
= maybe_hw_step (thread
);
5228 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5233 unsuspend_and_proceed_one_lwp (thread_info
*thread
, void *except
)
5235 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5240 lwp_suspended_decr (lwp
);
5242 return proceed_one_lwp (thread
, except
);
5245 /* When we finish a step-over, set threads running again. If there's
5246 another thread that may need a step-over, now's the time to start
5247 it. Eventually, we'll move all threads past their breakpoints. */
5250 proceed_all_lwps (void)
5252 struct thread_info
*need_step_over
;
5254 /* If there is a thread which would otherwise be resumed, which is
5255 stopped at a breakpoint that needs stepping over, then don't
5256 resume any threads - have it step over the breakpoint with all
5257 other threads stopped, then resume all threads again. */
5259 if (supports_breakpoints ())
5261 need_step_over
= find_thread (need_step_over_p
);
5263 if (need_step_over
!= NULL
)
5266 debug_printf ("proceed_all_lwps: found "
5267 "thread %ld needing a step-over\n",
5268 lwpid_of (need_step_over
));
5270 start_step_over (get_thread_lwp (need_step_over
));
5276 debug_printf ("Proceeding, no step-over needed\n");
5278 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
5281 /* Stopped LWPs that the client wanted to be running, that don't have
5282 pending statuses, are set to run again, except for EXCEPT, if not
5283 NULL. This undoes a stop_all_lwps call. */
5286 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5292 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5293 lwpid_of (get_lwp_thread (except
)));
5295 debug_printf ("unstopping all lwps\n");
5299 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
5301 find_inferior (&all_threads
, proceed_one_lwp
, except
);
5305 debug_printf ("unstop_all_lwps done\n");
5311 #ifdef HAVE_LINUX_REGSETS
5313 #define use_linux_regsets 1
5315 /* Returns true if REGSET has been disabled. */
5318 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5320 return (info
->disabled_regsets
!= NULL
5321 && info
->disabled_regsets
[regset
- info
->regsets
]);
5324 /* Disable REGSET. */
5327 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5331 dr_offset
= regset
- info
->regsets
;
5332 if (info
->disabled_regsets
== NULL
)
5333 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5334 info
->disabled_regsets
[dr_offset
] = 1;
5338 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5339 struct regcache
*regcache
)
5341 struct regset_info
*regset
;
5342 int saw_general_regs
= 0;
5346 pid
= lwpid_of (current_thread
);
5347 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5352 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5355 buf
= xmalloc (regset
->size
);
5357 nt_type
= regset
->nt_type
;
5361 iov
.iov_len
= regset
->size
;
5362 data
= (void *) &iov
;
5368 res
= ptrace (regset
->get_request
, pid
,
5369 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5371 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5377 /* If we get EIO on a regset, do not try it again for
5378 this process mode. */
5379 disable_regset (regsets_info
, regset
);
5381 else if (errno
== ENODATA
)
5383 /* ENODATA may be returned if the regset is currently
5384 not "active". This can happen in normal operation,
5385 so suppress the warning in this case. */
5387 else if (errno
== ESRCH
)
5389 /* At this point, ESRCH should mean the process is
5390 already gone, in which case we simply ignore attempts
5391 to read its registers. */
5396 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5403 if (regset
->type
== GENERAL_REGS
)
5404 saw_general_regs
= 1;
5405 regset
->store_function (regcache
, buf
);
5409 if (saw_general_regs
)
5416 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5417 struct regcache
*regcache
)
5419 struct regset_info
*regset
;
5420 int saw_general_regs
= 0;
5424 pid
= lwpid_of (current_thread
);
5425 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5430 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5431 || regset
->fill_function
== NULL
)
5434 buf
= xmalloc (regset
->size
);
5436 /* First fill the buffer with the current register set contents,
5437 in case there are any items in the kernel's regset that are
5438 not in gdbserver's regcache. */
5440 nt_type
= regset
->nt_type
;
5444 iov
.iov_len
= regset
->size
;
5445 data
= (void *) &iov
;
5451 res
= ptrace (regset
->get_request
, pid
,
5452 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5454 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5459 /* Then overlay our cached registers on that. */
5460 regset
->fill_function (regcache
, buf
);
5462 /* Only now do we write the register set. */
5464 res
= ptrace (regset
->set_request
, pid
,
5465 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5467 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5475 /* If we get EIO on a regset, do not try it again for
5476 this process mode. */
5477 disable_regset (regsets_info
, regset
);
5479 else if (errno
== ESRCH
)
5481 /* At this point, ESRCH should mean the process is
5482 already gone, in which case we simply ignore attempts
5483 to change its registers. See also the related
5484 comment in linux_resume_one_lwp. */
5490 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5493 else if (regset
->type
== GENERAL_REGS
)
5494 saw_general_regs
= 1;
5497 if (saw_general_regs
)
5503 #else /* !HAVE_LINUX_REGSETS */
5505 #define use_linux_regsets 0
5506 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5507 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5511 /* Return 1 if register REGNO is supported by one of the regset ptrace
5512 calls or 0 if it has to be transferred individually. */
5515 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5517 unsigned char mask
= 1 << (regno
% 8);
5518 size_t index
= regno
/ 8;
5520 return (use_linux_regsets
5521 && (regs_info
->regset_bitmap
== NULL
5522 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5525 #ifdef HAVE_LINUX_USRREGS
5528 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5532 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5533 error ("Invalid register number %d.", regnum
);
5535 addr
= usrregs
->regmap
[regnum
];
5540 /* Fetch one register. */
5542 fetch_register (const struct usrregs_info
*usrregs
,
5543 struct regcache
*regcache
, int regno
)
5550 if (regno
>= usrregs
->num_regs
)
5552 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5555 regaddr
= register_addr (usrregs
, regno
);
5559 size
= ((register_size (regcache
->tdesc
, regno
)
5560 + sizeof (PTRACE_XFER_TYPE
) - 1)
5561 & -sizeof (PTRACE_XFER_TYPE
));
5562 buf
= (char *) alloca (size
);
5564 pid
= lwpid_of (current_thread
);
5565 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5568 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5569 ptrace (PTRACE_PEEKUSER
, pid
,
5570 /* Coerce to a uintptr_t first to avoid potential gcc warning
5571 of coercing an 8 byte integer to a 4 byte pointer. */
5572 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5573 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5575 error ("reading register %d: %s", regno
, strerror (errno
));
5578 if (the_low_target
.supply_ptrace_register
)
5579 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5581 supply_register (regcache
, regno
, buf
);
5584 /* Store one register. */
5586 store_register (const struct usrregs_info
*usrregs
,
5587 struct regcache
*regcache
, int regno
)
5594 if (regno
>= usrregs
->num_regs
)
5596 if ((*the_low_target
.cannot_store_register
) (regno
))
5599 regaddr
= register_addr (usrregs
, regno
);
5603 size
= ((register_size (regcache
->tdesc
, regno
)
5604 + sizeof (PTRACE_XFER_TYPE
) - 1)
5605 & -sizeof (PTRACE_XFER_TYPE
));
5606 buf
= (char *) alloca (size
);
5607 memset (buf
, 0, size
);
5609 if (the_low_target
.collect_ptrace_register
)
5610 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5612 collect_register (regcache
, regno
, buf
);
5614 pid
= lwpid_of (current_thread
);
5615 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5618 ptrace (PTRACE_POKEUSER
, pid
,
5619 /* Coerce to a uintptr_t first to avoid potential gcc warning
5620 about coercing an 8 byte integer to a 4 byte pointer. */
5621 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5622 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5625 /* At this point, ESRCH should mean the process is
5626 already gone, in which case we simply ignore attempts
5627 to change its registers. See also the related
5628 comment in linux_resume_one_lwp. */
5632 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5633 error ("writing register %d: %s", regno
, strerror (errno
));
5635 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5639 /* Fetch all registers, or just one, from the child process.
5640 If REGNO is -1, do this for all registers, skipping any that are
5641 assumed to have been retrieved by regsets_fetch_inferior_registers,
5642 unless ALL is non-zero.
5643 Otherwise, REGNO specifies which register (so we can save time). */
5645 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5646 struct regcache
*regcache
, int regno
, int all
)
5648 struct usrregs_info
*usr
= regs_info
->usrregs
;
5652 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5653 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5654 fetch_register (usr
, regcache
, regno
);
5657 fetch_register (usr
, regcache
, regno
);
5660 /* Store our register values back into the inferior.
5661 If REGNO is -1, do this for all registers, skipping any that are
5662 assumed to have been saved by regsets_store_inferior_registers,
5663 unless ALL is non-zero.
5664 Otherwise, REGNO specifies which register (so we can save time). */
5666 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5667 struct regcache
*regcache
, int regno
, int all
)
5669 struct usrregs_info
*usr
= regs_info
->usrregs
;
5673 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5674 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5675 store_register (usr
, regcache
, regno
);
5678 store_register (usr
, regcache
, regno
);
5681 #else /* !HAVE_LINUX_USRREGS */
5683 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5684 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5690 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5694 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5698 if (the_low_target
.fetch_register
!= NULL
5699 && regs_info
->usrregs
!= NULL
)
5700 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5701 (*the_low_target
.fetch_register
) (regcache
, regno
);
5703 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5704 if (regs_info
->usrregs
!= NULL
)
5705 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5709 if (the_low_target
.fetch_register
!= NULL
5710 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5713 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5715 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5717 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5718 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5723 linux_store_registers (struct regcache
*regcache
, int regno
)
5727 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5731 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5733 if (regs_info
->usrregs
!= NULL
)
5734 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5738 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5740 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5742 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5743 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5748 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5749 to debugger memory starting at MYADDR. */
5752 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5754 int pid
= lwpid_of (current_thread
);
5755 PTRACE_XFER_TYPE
*buffer
;
5763 /* Try using /proc. Don't bother for one word. */
5764 if (len
>= 3 * sizeof (long))
5768 /* We could keep this file open and cache it - possibly one per
5769 thread. That requires some juggling, but is even faster. */
5770 sprintf (filename
, "/proc/%d/mem", pid
);
5771 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5775 /* If pread64 is available, use it. It's faster if the kernel
5776 supports it (only one syscall), and it's 64-bit safe even on
5777 32-bit platforms (for instance, SPARC debugging a SPARC64
5780 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5783 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5784 bytes
= read (fd
, myaddr
, len
);
5791 /* Some data was read, we'll try to get the rest with ptrace. */
5801 /* Round starting address down to longword boundary. */
5802 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5803 /* Round ending address up; get number of longwords that makes. */
5804 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5805 / sizeof (PTRACE_XFER_TYPE
));
5806 /* Allocate buffer of that many longwords. */
5807 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5809 /* Read all the longwords */
5811 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5813 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5814 about coercing an 8 byte integer to a 4 byte pointer. */
5815 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5816 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5817 (PTRACE_TYPE_ARG4
) 0);
5823 /* Copy appropriate bytes out of the buffer. */
5826 i
*= sizeof (PTRACE_XFER_TYPE
);
5827 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5829 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5836 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5837 memory at MEMADDR. On failure (cannot write to the inferior)
5838 returns the value of errno. Always succeeds if LEN is zero. */
5841 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5844 /* Round starting address down to longword boundary. */
5845 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5846 /* Round ending address up; get number of longwords that makes. */
5848 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5849 / sizeof (PTRACE_XFER_TYPE
);
5851 /* Allocate buffer of that many longwords. */
5852 PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5854 int pid
= lwpid_of (current_thread
);
5858 /* Zero length write always succeeds. */
5864 /* Dump up to four bytes. */
5865 char str
[4 * 2 + 1];
5867 int dump
= len
< 4 ? len
: 4;
5869 for (i
= 0; i
< dump
; i
++)
5871 sprintf (p
, "%02x", myaddr
[i
]);
5876 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5877 str
, (long) memaddr
, pid
);
5880 /* Fill start and end extra bytes of buffer with existing memory data. */
5883 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5884 about coercing an 8 byte integer to a 4 byte pointer. */
5885 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5886 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5887 (PTRACE_TYPE_ARG4
) 0);
5895 = ptrace (PTRACE_PEEKTEXT
, pid
,
5896 /* Coerce to a uintptr_t first to avoid potential gcc warning
5897 about coercing an 8 byte integer to a 4 byte pointer. */
5898 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5899 * sizeof (PTRACE_XFER_TYPE
)),
5900 (PTRACE_TYPE_ARG4
) 0);
5905 /* Copy data to be written over corresponding part of buffer. */
5907 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5910 /* Write the entire buffer. */
5912 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5915 ptrace (PTRACE_POKETEXT
, pid
,
5916 /* Coerce to a uintptr_t first to avoid potential gcc warning
5917 about coercing an 8 byte integer to a 4 byte pointer. */
5918 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5919 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5928 linux_look_up_symbols (void)
5930 #ifdef USE_THREAD_DB
5931 struct process_info
*proc
= current_process ();
5933 if (proc
->priv
->thread_db
!= NULL
)
5941 linux_request_interrupt (void)
5943 /* Send a SIGINT to the process group. This acts just like the user
5944 typed a ^C on the controlling terminal. */
5945 kill (-signal_pid
, SIGINT
);
5948 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5949 to debugger memory starting at MYADDR. */
5952 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5954 char filename
[PATH_MAX
];
5956 int pid
= lwpid_of (current_thread
);
5958 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5960 fd
= open (filename
, O_RDONLY
);
5964 if (offset
!= (CORE_ADDR
) 0
5965 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5968 n
= read (fd
, myaddr
, len
);
5975 /* These breakpoint and watchpoint related wrapper functions simply
5976 pass on the function call if the target has registered a
5977 corresponding function. */
5980 linux_supports_z_point_type (char z_type
)
5982 return (the_low_target
.supports_z_point_type
!= NULL
5983 && the_low_target
.supports_z_point_type (z_type
));
5987 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5988 int size
, struct raw_breakpoint
*bp
)
5990 if (type
== raw_bkpt_type_sw
)
5991 return insert_memory_breakpoint (bp
);
5992 else if (the_low_target
.insert_point
!= NULL
)
5993 return the_low_target
.insert_point (type
, addr
, size
, bp
);
5995 /* Unsupported (see target.h). */
6000 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6001 int size
, struct raw_breakpoint
*bp
)
6003 if (type
== raw_bkpt_type_sw
)
6004 return remove_memory_breakpoint (bp
);
6005 else if (the_low_target
.remove_point
!= NULL
)
6006 return the_low_target
.remove_point (type
, addr
, size
, bp
);
6008 /* Unsupported (see target.h). */
6012 /* Implement the to_stopped_by_sw_breakpoint target_ops
6016 linux_stopped_by_sw_breakpoint (void)
6018 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6020 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
6023 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
6027 linux_supports_stopped_by_sw_breakpoint (void)
6029 return USE_SIGTRAP_SIGINFO
;
6032 /* Implement the to_stopped_by_hw_breakpoint target_ops
6036 linux_stopped_by_hw_breakpoint (void)
6038 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6040 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6043 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6047 linux_supports_stopped_by_hw_breakpoint (void)
6049 return USE_SIGTRAP_SIGINFO
;
6052 /* Implement the supports_hardware_single_step target_ops method. */
6055 linux_supports_hardware_single_step (void)
6057 return can_hardware_single_step ();
6061 linux_supports_software_single_step (void)
6063 return can_software_single_step ();
6067 linux_stopped_by_watchpoint (void)
6069 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6071 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6075 linux_stopped_data_address (void)
6077 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6079 return lwp
->stopped_data_address
;
6082 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6083 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6084 && defined(PT_TEXT_END_ADDR)
6086 /* This is only used for targets that define PT_TEXT_ADDR,
6087 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6088 the target has different ways of acquiring this information, like
6091 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6092 to tell gdb about. */
6095 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6097 unsigned long text
, text_end
, data
;
6098 int pid
= lwpid_of (current_thread
);
6102 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6103 (PTRACE_TYPE_ARG4
) 0);
6104 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6105 (PTRACE_TYPE_ARG4
) 0);
6106 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6107 (PTRACE_TYPE_ARG4
) 0);
6111 /* Both text and data offsets produced at compile-time (and so
6112 used by gdb) are relative to the beginning of the program,
6113 with the data segment immediately following the text segment.
6114 However, the actual runtime layout in memory may put the data
6115 somewhere else, so when we send gdb a data base-address, we
6116 use the real data base address and subtract the compile-time
6117 data base-address from it (which is just the length of the
6118 text segment). BSS immediately follows data in both
6121 *data_p
= data
- (text_end
- text
);
6130 linux_qxfer_osdata (const char *annex
,
6131 unsigned char *readbuf
, unsigned const char *writebuf
,
6132 CORE_ADDR offset
, int len
)
6134 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6137 /* Convert a native/host siginfo object, into/from the siginfo in the
6138 layout of the inferiors' architecture. */
6141 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6145 if (the_low_target
.siginfo_fixup
!= NULL
)
6146 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6148 /* If there was no callback, or the callback didn't do anything,
6149 then just do a straight memcpy. */
6153 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6155 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6160 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6161 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6165 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6167 if (current_thread
== NULL
)
6170 pid
= lwpid_of (current_thread
);
6173 debug_printf ("%s siginfo for lwp %d.\n",
6174 readbuf
!= NULL
? "Reading" : "Writing",
6177 if (offset
>= sizeof (siginfo
))
6180 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6183 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6184 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6185 inferior with a 64-bit GDBSERVER should look the same as debugging it
6186 with a 32-bit GDBSERVER, we need to convert it. */
6187 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6189 if (offset
+ len
> sizeof (siginfo
))
6190 len
= sizeof (siginfo
) - offset
;
6192 if (readbuf
!= NULL
)
6193 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6196 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6198 /* Convert back to ptrace layout before flushing it out. */
6199 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6201 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6208 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6209 so we notice when children change state; as the handler for the
6210 sigsuspend in my_waitpid. */
6213 sigchld_handler (int signo
)
6215 int old_errno
= errno
;
6221 /* fprintf is not async-signal-safe, so call write
6223 if (write (2, "sigchld_handler\n",
6224 sizeof ("sigchld_handler\n") - 1) < 0)
6225 break; /* just ignore */
6229 if (target_is_async_p ())
6230 async_file_mark (); /* trigger a linux_wait */
6236 linux_supports_non_stop (void)
6242 linux_async (int enable
)
6244 int previous
= target_is_async_p ();
6247 debug_printf ("linux_async (%d), previous=%d\n",
6250 if (previous
!= enable
)
6253 sigemptyset (&mask
);
6254 sigaddset (&mask
, SIGCHLD
);
6256 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6260 if (pipe (linux_event_pipe
) == -1)
6262 linux_event_pipe
[0] = -1;
6263 linux_event_pipe
[1] = -1;
6264 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6266 warning ("creating event pipe failed.");
6270 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6271 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6273 /* Register the event loop handler. */
6274 add_file_handler (linux_event_pipe
[0],
6275 handle_target_event
, NULL
);
6277 /* Always trigger a linux_wait. */
6282 delete_file_handler (linux_event_pipe
[0]);
6284 close (linux_event_pipe
[0]);
6285 close (linux_event_pipe
[1]);
6286 linux_event_pipe
[0] = -1;
6287 linux_event_pipe
[1] = -1;
6290 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6297 linux_start_non_stop (int nonstop
)
6299 /* Register or unregister from event-loop accordingly. */
6300 linux_async (nonstop
);
6302 if (target_is_async_p () != (nonstop
!= 0))
6309 linux_supports_multi_process (void)
6314 /* Check if fork events are supported. */
6317 linux_supports_fork_events (void)
6319 return linux_supports_tracefork ();
6322 /* Check if vfork events are supported. */
6325 linux_supports_vfork_events (void)
6327 return linux_supports_tracefork ();
6330 /* Check if exec events are supported. */
6333 linux_supports_exec_events (void)
6335 return linux_supports_traceexec ();
6338 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6339 ptrace flags for all inferiors. This is in case the new GDB connection
6340 doesn't support the same set of events that the previous one did. */
6343 linux_handle_new_gdb_connection (void)
6345 /* Request that all the lwps reset their ptrace options. */
6346 for_each_thread ([] (thread_info
*thread
)
6348 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6352 /* Stop the lwp so we can modify its ptrace options. */
6353 lwp
->must_set_ptrace_flags
= 1;
6354 linux_stop_lwp (lwp
);
6358 /* Already stopped; go ahead and set the ptrace options. */
6359 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6360 int options
= linux_low_ptrace_options (proc
->attached
);
6362 linux_enable_event_reporting (lwpid_of (thread
), options
);
6363 lwp
->must_set_ptrace_flags
= 0;
6369 linux_supports_disable_randomization (void)
6371 #ifdef HAVE_PERSONALITY
6379 linux_supports_agent (void)
6385 linux_supports_range_stepping (void)
6387 if (can_software_single_step ())
6389 if (*the_low_target
.supports_range_stepping
== NULL
)
6392 return (*the_low_target
.supports_range_stepping
) ();
6395 /* Enumerate spufs IDs for process PID. */
6397 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6403 struct dirent
*entry
;
6405 sprintf (path
, "/proc/%ld/fd", pid
);
6406 dir
= opendir (path
);
6411 while ((entry
= readdir (dir
)) != NULL
)
6417 fd
= atoi (entry
->d_name
);
6421 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6422 if (stat (path
, &st
) != 0)
6424 if (!S_ISDIR (st
.st_mode
))
6427 if (statfs (path
, &stfs
) != 0)
6429 if (stfs
.f_type
!= SPUFS_MAGIC
)
6432 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6434 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6444 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6445 object type, using the /proc file system. */
6447 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6448 unsigned const char *writebuf
,
6449 CORE_ADDR offset
, int len
)
6451 long pid
= lwpid_of (current_thread
);
6456 if (!writebuf
&& !readbuf
)
6464 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6467 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6468 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6473 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6480 ret
= write (fd
, writebuf
, (size_t) len
);
6482 ret
= read (fd
, readbuf
, (size_t) len
);
6488 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6489 struct target_loadseg
6491 /* Core address to which the segment is mapped. */
6493 /* VMA recorded in the program header. */
6495 /* Size of this segment in memory. */
6499 # if defined PT_GETDSBT
6500 struct target_loadmap
6502 /* Protocol version number, must be zero. */
6504 /* Pointer to the DSBT table, its size, and the DSBT index. */
6505 unsigned *dsbt_table
;
6506 unsigned dsbt_size
, dsbt_index
;
6507 /* Number of segments in this map. */
6509 /* The actual memory map. */
6510 struct target_loadseg segs
[/*nsegs*/];
6512 # define LINUX_LOADMAP PT_GETDSBT
6513 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6514 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6516 struct target_loadmap
6518 /* Protocol version number, must be zero. */
6520 /* Number of segments in this map. */
6522 /* The actual memory map. */
6523 struct target_loadseg segs
[/*nsegs*/];
6525 # define LINUX_LOADMAP PTRACE_GETFDPIC
6526 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6527 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6531 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6532 unsigned char *myaddr
, unsigned int len
)
6534 int pid
= lwpid_of (current_thread
);
6536 struct target_loadmap
*data
= NULL
;
6537 unsigned int actual_length
, copy_length
;
6539 if (strcmp (annex
, "exec") == 0)
6540 addr
= (int) LINUX_LOADMAP_EXEC
;
6541 else if (strcmp (annex
, "interp") == 0)
6542 addr
= (int) LINUX_LOADMAP_INTERP
;
6546 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6552 actual_length
= sizeof (struct target_loadmap
)
6553 + sizeof (struct target_loadseg
) * data
->nsegs
;
6555 if (offset
< 0 || offset
> actual_length
)
6558 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6559 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6563 # define linux_read_loadmap NULL
6564 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6567 linux_process_qsupported (char **features
, int count
)
6569 if (the_low_target
.process_qsupported
!= NULL
)
6570 the_low_target
.process_qsupported (features
, count
);
6574 linux_supports_catch_syscall (void)
6576 return (the_low_target
.get_syscall_trapinfo
!= NULL
6577 && linux_supports_tracesysgood ());
6581 linux_get_ipa_tdesc_idx (void)
6583 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6586 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6590 linux_supports_tracepoints (void)
6592 if (*the_low_target
.supports_tracepoints
== NULL
)
6595 return (*the_low_target
.supports_tracepoints
) ();
6599 linux_read_pc (struct regcache
*regcache
)
6601 if (the_low_target
.get_pc
== NULL
)
6604 return (*the_low_target
.get_pc
) (regcache
);
6608 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6610 gdb_assert (the_low_target
.set_pc
!= NULL
);
6612 (*the_low_target
.set_pc
) (regcache
, pc
);
6616 linux_thread_stopped (struct thread_info
*thread
)
6618 return get_thread_lwp (thread
)->stopped
;
6621 /* This exposes stop-all-threads functionality to other modules. */
6624 linux_pause_all (int freeze
)
6626 stop_all_lwps (freeze
, NULL
);
6629 /* This exposes unstop-all-threads functionality to other gdbserver
6633 linux_unpause_all (int unfreeze
)
6635 unstop_all_lwps (unfreeze
, NULL
);
6639 linux_prepare_to_access_memory (void)
6641 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6644 linux_pause_all (1);
6649 linux_done_accessing_memory (void)
6651 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6654 linux_unpause_all (1);
6658 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6659 CORE_ADDR collector
,
6662 CORE_ADDR
*jump_entry
,
6663 CORE_ADDR
*trampoline
,
6664 ULONGEST
*trampoline_size
,
6665 unsigned char *jjump_pad_insn
,
6666 ULONGEST
*jjump_pad_insn_size
,
6667 CORE_ADDR
*adjusted_insn_addr
,
6668 CORE_ADDR
*adjusted_insn_addr_end
,
6671 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6672 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6673 jump_entry
, trampoline
, trampoline_size
,
6674 jjump_pad_insn
, jjump_pad_insn_size
,
6675 adjusted_insn_addr
, adjusted_insn_addr_end
,
6679 static struct emit_ops
*
6680 linux_emit_ops (void)
6682 if (the_low_target
.emit_ops
!= NULL
)
6683 return (*the_low_target
.emit_ops
) ();
6689 linux_get_min_fast_tracepoint_insn_len (void)
6691 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6694 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6697 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6698 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6700 char filename
[PATH_MAX
];
6702 const int auxv_size
= is_elf64
6703 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6704 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6706 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6708 fd
= open (filename
, O_RDONLY
);
6714 while (read (fd
, buf
, auxv_size
) == auxv_size
6715 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6719 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6721 switch (aux
->a_type
)
6724 *phdr_memaddr
= aux
->a_un
.a_val
;
6727 *num_phdr
= aux
->a_un
.a_val
;
6733 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6735 switch (aux
->a_type
)
6738 *phdr_memaddr
= aux
->a_un
.a_val
;
6741 *num_phdr
= aux
->a_un
.a_val
;
6749 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6751 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6752 "phdr_memaddr = %ld, phdr_num = %d",
6753 (long) *phdr_memaddr
, *num_phdr
);
6760 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6763 get_dynamic (const int pid
, const int is_elf64
)
6765 CORE_ADDR phdr_memaddr
, relocation
;
6767 unsigned char *phdr_buf
;
6768 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6770 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6773 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6774 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6776 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6779 /* Compute relocation: it is expected to be 0 for "regular" executables,
6780 non-zero for PIE ones. */
6782 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6785 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6787 if (p
->p_type
== PT_PHDR
)
6788 relocation
= phdr_memaddr
- p
->p_vaddr
;
6792 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6794 if (p
->p_type
== PT_PHDR
)
6795 relocation
= phdr_memaddr
- p
->p_vaddr
;
6798 if (relocation
== -1)
6800 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6801 any real world executables, including PIE executables, have always
6802 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6803 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6804 or present DT_DEBUG anyway (fpc binaries are statically linked).
6806 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6808 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6813 for (i
= 0; i
< num_phdr
; i
++)
6817 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6819 if (p
->p_type
== PT_DYNAMIC
)
6820 return p
->p_vaddr
+ relocation
;
6824 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6826 if (p
->p_type
== PT_DYNAMIC
)
6827 return p
->p_vaddr
+ relocation
;
6834 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6835 can be 0 if the inferior does not yet have the library list initialized.
6836 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6837 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6840 get_r_debug (const int pid
, const int is_elf64
)
6842 CORE_ADDR dynamic_memaddr
;
6843 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6844 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6847 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6848 if (dynamic_memaddr
== 0)
6851 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6855 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6856 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6860 unsigned char buf
[sizeof (Elf64_Xword
)];
6864 #ifdef DT_MIPS_RLD_MAP
6865 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6867 if (linux_read_memory (dyn
->d_un
.d_val
,
6868 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6873 #endif /* DT_MIPS_RLD_MAP */
6874 #ifdef DT_MIPS_RLD_MAP_REL
6875 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6877 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6878 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6883 #endif /* DT_MIPS_RLD_MAP_REL */
6885 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6886 map
= dyn
->d_un
.d_val
;
6888 if (dyn
->d_tag
== DT_NULL
)
6893 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6894 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6898 unsigned char buf
[sizeof (Elf32_Word
)];
6902 #ifdef DT_MIPS_RLD_MAP
6903 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6905 if (linux_read_memory (dyn
->d_un
.d_val
,
6906 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6911 #endif /* DT_MIPS_RLD_MAP */
6912 #ifdef DT_MIPS_RLD_MAP_REL
6913 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6915 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6916 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6921 #endif /* DT_MIPS_RLD_MAP_REL */
6923 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6924 map
= dyn
->d_un
.d_val
;
6926 if (dyn
->d_tag
== DT_NULL
)
6930 dynamic_memaddr
+= dyn_size
;
6936 /* Read one pointer from MEMADDR in the inferior. */
6939 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6943 /* Go through a union so this works on either big or little endian
6944 hosts, when the inferior's pointer size is smaller than the size
6945 of CORE_ADDR. It is assumed the inferior's endianness is the
6946 same of the superior's. */
6949 CORE_ADDR core_addr
;
6954 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6957 if (ptr_size
== sizeof (CORE_ADDR
))
6958 *ptr
= addr
.core_addr
;
6959 else if (ptr_size
== sizeof (unsigned int))
6962 gdb_assert_not_reached ("unhandled pointer size");
6967 struct link_map_offsets
6969 /* Offset and size of r_debug.r_version. */
6970 int r_version_offset
;
6972 /* Offset and size of r_debug.r_map. */
6975 /* Offset to l_addr field in struct link_map. */
6978 /* Offset to l_name field in struct link_map. */
6981 /* Offset to l_ld field in struct link_map. */
6984 /* Offset to l_next field in struct link_map. */
6987 /* Offset to l_prev field in struct link_map. */
6991 /* Construct qXfer:libraries-svr4:read reply. */
6994 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
6995 unsigned const char *writebuf
,
6996 CORE_ADDR offset
, int len
)
6999 unsigned document_len
;
7000 struct process_info_private
*const priv
= current_process ()->priv
;
7001 char filename
[PATH_MAX
];
7004 static const struct link_map_offsets lmo_32bit_offsets
=
7006 0, /* r_version offset. */
7007 4, /* r_debug.r_map offset. */
7008 0, /* l_addr offset in link_map. */
7009 4, /* l_name offset in link_map. */
7010 8, /* l_ld offset in link_map. */
7011 12, /* l_next offset in link_map. */
7012 16 /* l_prev offset in link_map. */
7015 static const struct link_map_offsets lmo_64bit_offsets
=
7017 0, /* r_version offset. */
7018 8, /* r_debug.r_map offset. */
7019 0, /* l_addr offset in link_map. */
7020 8, /* l_name offset in link_map. */
7021 16, /* l_ld offset in link_map. */
7022 24, /* l_next offset in link_map. */
7023 32 /* l_prev offset in link_map. */
7025 const struct link_map_offsets
*lmo
;
7026 unsigned int machine
;
7028 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7029 int allocated
= 1024;
7031 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7032 int header_done
= 0;
7034 if (writebuf
!= NULL
)
7036 if (readbuf
== NULL
)
7039 pid
= lwpid_of (current_thread
);
7040 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7041 is_elf64
= elf_64_file_p (filename
, &machine
);
7042 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7043 ptr_size
= is_elf64
? 8 : 4;
7045 while (annex
[0] != '\0')
7051 sep
= strchr (annex
, '=');
7056 if (len
== 5 && startswith (annex
, "start"))
7058 else if (len
== 4 && startswith (annex
, "prev"))
7062 annex
= strchr (sep
, ';');
7069 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7076 if (priv
->r_debug
== 0)
7077 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7079 /* We failed to find DT_DEBUG. Such situation will not change
7080 for this inferior - do not retry it. Report it to GDB as
7081 E01, see for the reasons at the GDB solib-svr4.c side. */
7082 if (priv
->r_debug
== (CORE_ADDR
) -1)
7085 if (priv
->r_debug
!= 0)
7087 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7088 (unsigned char *) &r_version
,
7089 sizeof (r_version
)) != 0
7092 warning ("unexpected r_debug version %d", r_version
);
7094 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7095 &lm_addr
, ptr_size
) != 0)
7097 warning ("unable to read r_map from 0x%lx",
7098 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7103 document
= (char *) xmalloc (allocated
);
7104 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7105 p
= document
+ strlen (document
);
7108 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7109 &l_name
, ptr_size
) == 0
7110 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7111 &l_addr
, ptr_size
) == 0
7112 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7113 &l_ld
, ptr_size
) == 0
7114 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7115 &l_prev
, ptr_size
) == 0
7116 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7117 &l_next
, ptr_size
) == 0)
7119 unsigned char libname
[PATH_MAX
];
7121 if (lm_prev
!= l_prev
)
7123 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7124 (long) lm_prev
, (long) l_prev
);
7128 /* Ignore the first entry even if it has valid name as the first entry
7129 corresponds to the main executable. The first entry should not be
7130 skipped if the dynamic loader was loaded late by a static executable
7131 (see solib-svr4.c parameter ignore_first). But in such case the main
7132 executable does not have PT_DYNAMIC present and this function already
7133 exited above due to failed get_r_debug. */
7136 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7141 /* Not checking for error because reading may stop before
7142 we've got PATH_MAX worth of characters. */
7144 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7145 libname
[sizeof (libname
) - 1] = '\0';
7146 if (libname
[0] != '\0')
7148 /* 6x the size for xml_escape_text below. */
7149 size_t len
= 6 * strlen ((char *) libname
);
7153 /* Terminate `<library-list-svr4'. */
7158 while (allocated
< p
- document
+ len
+ 200)
7160 /* Expand to guarantee sufficient storage. */
7161 uintptr_t document_len
= p
- document
;
7163 document
= (char *) xrealloc (document
, 2 * allocated
);
7165 p
= document
+ document_len
;
7168 std::string name
= xml_escape_text ((char *) libname
);
7169 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7170 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7171 name
.c_str (), (unsigned long) lm_addr
,
7172 (unsigned long) l_addr
, (unsigned long) l_ld
);
7182 /* Empty list; terminate `<library-list-svr4'. */
7186 strcpy (p
, "</library-list-svr4>");
7188 document_len
= strlen (document
);
7189 if (offset
< document_len
)
7190 document_len
-= offset
;
7193 if (len
> document_len
)
7196 memcpy (readbuf
, document
+ offset
, len
);
7202 #ifdef HAVE_LINUX_BTRACE
7204 /* See to_disable_btrace target method. */
7207 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7209 enum btrace_error err
;
7211 err
= linux_disable_btrace (tinfo
);
7212 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7215 /* Encode an Intel Processor Trace configuration. */
7218 linux_low_encode_pt_config (struct buffer
*buffer
,
7219 const struct btrace_data_pt_config
*config
)
7221 buffer_grow_str (buffer
, "<pt-config>\n");
7223 switch (config
->cpu
.vendor
)
7226 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7227 "model=\"%u\" stepping=\"%u\"/>\n",
7228 config
->cpu
.family
, config
->cpu
.model
,
7229 config
->cpu
.stepping
);
7236 buffer_grow_str (buffer
, "</pt-config>\n");
7239 /* Encode a raw buffer. */
7242 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7248 /* We use hex encoding - see common/rsp-low.h. */
7249 buffer_grow_str (buffer
, "<raw>\n");
7255 elem
[0] = tohex ((*data
>> 4) & 0xf);
7256 elem
[1] = tohex (*data
++ & 0xf);
7258 buffer_grow (buffer
, elem
, 2);
7261 buffer_grow_str (buffer
, "</raw>\n");
7264 /* See to_read_btrace target method. */
7267 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7268 enum btrace_read_type type
)
7270 struct btrace_data btrace
;
7271 struct btrace_block
*block
;
7272 enum btrace_error err
;
7275 btrace_data_init (&btrace
);
7277 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7278 if (err
!= BTRACE_ERR_NONE
)
7280 if (err
== BTRACE_ERR_OVERFLOW
)
7281 buffer_grow_str0 (buffer
, "E.Overflow.");
7283 buffer_grow_str0 (buffer
, "E.Generic Error.");
7288 switch (btrace
.format
)
7290 case BTRACE_FORMAT_NONE
:
7291 buffer_grow_str0 (buffer
, "E.No Trace.");
7294 case BTRACE_FORMAT_BTS
:
7295 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7296 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7299 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7301 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7302 paddress (block
->begin
), paddress (block
->end
));
7304 buffer_grow_str0 (buffer
, "</btrace>\n");
7307 case BTRACE_FORMAT_PT
:
7308 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7309 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7310 buffer_grow_str (buffer
, "<pt>\n");
7312 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7314 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7315 btrace
.variant
.pt
.size
);
7317 buffer_grow_str (buffer
, "</pt>\n");
7318 buffer_grow_str0 (buffer
, "</btrace>\n");
7322 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7326 btrace_data_fini (&btrace
);
7330 btrace_data_fini (&btrace
);
7334 /* See to_btrace_conf target method. */
7337 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7338 struct buffer
*buffer
)
7340 const struct btrace_config
*conf
;
7342 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7343 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7345 conf
= linux_btrace_conf (tinfo
);
7348 switch (conf
->format
)
7350 case BTRACE_FORMAT_NONE
:
7353 case BTRACE_FORMAT_BTS
:
7354 buffer_xml_printf (buffer
, "<bts");
7355 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7356 buffer_xml_printf (buffer
, " />\n");
7359 case BTRACE_FORMAT_PT
:
7360 buffer_xml_printf (buffer
, "<pt");
7361 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7362 buffer_xml_printf (buffer
, "/>\n");
7367 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7370 #endif /* HAVE_LINUX_BTRACE */
7372 /* See nat/linux-nat.h. */
7375 current_lwp_ptid (void)
7377 return ptid_of (current_thread
);
7380 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7383 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7385 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7386 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7388 return default_breakpoint_kind_from_pc (pcptr
);
7391 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7393 static const gdb_byte
*
7394 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7396 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7398 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7401 /* Implementation of the target_ops method
7402 "breakpoint_kind_from_current_state". */
7405 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7407 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7408 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7410 return linux_breakpoint_kind_from_pc (pcptr
);
7413 /* Default implementation of linux_target_ops method "set_pc" for
7414 32-bit pc register which is literally named "pc". */
7417 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7419 uint32_t newpc
= pc
;
7421 supply_register_by_name (regcache
, "pc", &newpc
);
7424 /* Default implementation of linux_target_ops method "get_pc" for
7425 32-bit pc register which is literally named "pc". */
7428 linux_get_pc_32bit (struct regcache
*regcache
)
7432 collect_register_by_name (regcache
, "pc", &pc
);
7434 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7438 /* Default implementation of linux_target_ops method "set_pc" for
7439 64-bit pc register which is literally named "pc". */
7442 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7444 uint64_t newpc
= pc
;
7446 supply_register_by_name (regcache
, "pc", &newpc
);
7449 /* Default implementation of linux_target_ops method "get_pc" for
7450 64-bit pc register which is literally named "pc". */
7453 linux_get_pc_64bit (struct regcache
*regcache
)
7457 collect_register_by_name (regcache
, "pc", &pc
);
7459 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7464 static struct target_ops linux_target_ops
= {
7465 linux_create_inferior
,
7466 linux_post_create_inferior
,
7475 linux_fetch_registers
,
7476 linux_store_registers
,
7477 linux_prepare_to_access_memory
,
7478 linux_done_accessing_memory
,
7481 linux_look_up_symbols
,
7482 linux_request_interrupt
,
7484 linux_supports_z_point_type
,
7487 linux_stopped_by_sw_breakpoint
,
7488 linux_supports_stopped_by_sw_breakpoint
,
7489 linux_stopped_by_hw_breakpoint
,
7490 linux_supports_stopped_by_hw_breakpoint
,
7491 linux_supports_hardware_single_step
,
7492 linux_stopped_by_watchpoint
,
7493 linux_stopped_data_address
,
7494 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7495 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7496 && defined(PT_TEXT_END_ADDR)
7501 #ifdef USE_THREAD_DB
7502 thread_db_get_tls_address
,
7507 hostio_last_error_from_errno
,
7510 linux_supports_non_stop
,
7512 linux_start_non_stop
,
7513 linux_supports_multi_process
,
7514 linux_supports_fork_events
,
7515 linux_supports_vfork_events
,
7516 linux_supports_exec_events
,
7517 linux_handle_new_gdb_connection
,
7518 #ifdef USE_THREAD_DB
7519 thread_db_handle_monitor_command
,
7523 linux_common_core_of_thread
,
7525 linux_process_qsupported
,
7526 linux_supports_tracepoints
,
7529 linux_thread_stopped
,
7533 linux_stabilize_threads
,
7534 linux_install_fast_tracepoint_jump_pad
,
7536 linux_supports_disable_randomization
,
7537 linux_get_min_fast_tracepoint_insn_len
,
7538 linux_qxfer_libraries_svr4
,
7539 linux_supports_agent
,
7540 #ifdef HAVE_LINUX_BTRACE
7541 linux_supports_btrace
,
7542 linux_enable_btrace
,
7543 linux_low_disable_btrace
,
7544 linux_low_read_btrace
,
7545 linux_low_btrace_conf
,
7553 linux_supports_range_stepping
,
7554 linux_proc_pid_to_exec_file
,
7555 linux_mntns_open_cloexec
,
7557 linux_mntns_readlink
,
7558 linux_breakpoint_kind_from_pc
,
7559 linux_sw_breakpoint_from_kind
,
7560 linux_proc_tid_get_name
,
7561 linux_breakpoint_kind_from_current_state
,
7562 linux_supports_software_single_step
,
7563 linux_supports_catch_syscall
,
7564 linux_get_ipa_tdesc_idx
,
7566 thread_db_thread_handle
,
7572 #ifdef HAVE_LINUX_REGSETS
7574 initialize_regsets_info (struct regsets_info
*info
)
7576 for (info
->num_regsets
= 0;
7577 info
->regsets
[info
->num_regsets
].size
>= 0;
7578 info
->num_regsets
++)
7584 initialize_low (void)
7586 struct sigaction sigchld_action
;
7588 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7589 set_target_ops (&linux_target_ops
);
7591 linux_ptrace_init_warnings ();
7593 sigchld_action
.sa_handler
= sigchld_handler
;
7594 sigemptyset (&sigchld_action
.sa_mask
);
7595 sigchld_action
.sa_flags
= SA_RESTART
;
7596 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7598 initialize_low_arch ();
7600 linux_check_ptrace_features ();