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
);
1251 second_thread_of_pid_p (thread_info
*thread
, void *args
)
1253 struct counter
*counter
= (struct counter
*) args
;
1255 if (thread
->id
.pid () == counter
->pid
)
1257 if (++counter
->count
> 1)
1265 last_thread_of_process_p (int pid
)
1267 struct counter counter
= { pid
, 0 };
1269 return (find_inferior (&all_threads
,
1270 second_thread_of_pid_p
, &counter
) == NULL
);
1276 linux_kill_one_lwp (struct lwp_info
*lwp
)
1278 struct thread_info
*thr
= get_lwp_thread (lwp
);
1279 int pid
= lwpid_of (thr
);
1281 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1282 there is no signal context, and ptrace(PTRACE_KILL) (or
1283 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1284 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1285 alternative is to kill with SIGKILL. We only need one SIGKILL
1286 per process, not one for each thread. But since we still support
1287 support debugging programs using raw clone without CLONE_THREAD,
1288 we send one for each thread. For years, we used PTRACE_KILL
1289 only, so we're being a bit paranoid about some old kernels where
1290 PTRACE_KILL might work better (dubious if there are any such, but
1291 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1292 second, and so we're fine everywhere. */
1295 kill_lwp (pid
, SIGKILL
);
1298 int save_errno
= errno
;
1300 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1301 target_pid_to_str (ptid_of (thr
)),
1302 save_errno
? strerror (save_errno
) : "OK");
1306 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1309 int save_errno
= errno
;
1311 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1312 target_pid_to_str (ptid_of (thr
)),
1313 save_errno
? strerror (save_errno
) : "OK");
1317 /* Kill LWP and wait for it to die. */
1320 kill_wait_lwp (struct lwp_info
*lwp
)
1322 struct thread_info
*thr
= get_lwp_thread (lwp
);
1323 int pid
= ptid_get_pid (ptid_of (thr
));
1324 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1329 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1333 linux_kill_one_lwp (lwp
);
1335 /* Make sure it died. Notes:
1337 - The loop is most likely unnecessary.
1339 - We don't use linux_wait_for_event as that could delete lwps
1340 while we're iterating over them. We're not interested in
1341 any pending status at this point, only in making sure all
1342 wait status on the kernel side are collected until the
1345 - We don't use __WALL here as the __WALL emulation relies on
1346 SIGCHLD, and killing a stopped process doesn't generate
1347 one, nor an exit status.
1349 res
= my_waitpid (lwpid
, &wstat
, 0);
1350 if (res
== -1 && errno
== ECHILD
)
1351 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1352 } while (res
> 0 && WIFSTOPPED (wstat
));
1354 /* Even if it was stopped, the child may have already disappeared.
1355 E.g., if it was killed by SIGKILL. */
1356 if (res
< 0 && errno
!= ECHILD
)
1357 perror_with_name ("kill_wait_lwp");
1360 /* Callback for `for_each_thread'. Kills an lwp of a given process,
1361 except the leader. */
1364 kill_one_lwp_callback (thread_info
*thread
, int pid
)
1366 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1368 /* We avoid killing the first thread here, because of a Linux kernel (at
1369 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1370 the children get a chance to be reaped, it will remain a zombie
1373 if (lwpid_of (thread
) == pid
)
1376 debug_printf ("lkop: is last of process %s\n",
1377 target_pid_to_str (thread
->id
));
1381 kill_wait_lwp (lwp
);
1385 linux_kill (int pid
)
1387 struct process_info
*process
;
1388 struct lwp_info
*lwp
;
1390 process
= find_process_pid (pid
);
1391 if (process
== NULL
)
1394 /* If we're killing a running inferior, make sure it is stopped
1395 first, as PTRACE_KILL will not work otherwise. */
1396 stop_all_lwps (0, NULL
);
1398 for_each_thread (pid
, [&] (thread_info
*thread
)
1400 kill_one_lwp_callback (thread
, pid
);
1403 /* See the comment in linux_kill_one_lwp. We did not kill the first
1404 thread in the list, so do so now. */
1405 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1410 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1414 kill_wait_lwp (lwp
);
1416 the_target
->mourn (process
);
1418 /* Since we presently can only stop all lwps of all processes, we
1419 need to unstop lwps of other processes. */
1420 unstop_all_lwps (0, NULL
);
1424 /* Get pending signal of THREAD, for detaching purposes. This is the
1425 signal the thread last stopped for, which we need to deliver to the
1426 thread when detaching, otherwise, it'd be suppressed/lost. */
1429 get_detach_signal (struct thread_info
*thread
)
1431 enum gdb_signal signo
= GDB_SIGNAL_0
;
1433 struct lwp_info
*lp
= get_thread_lwp (thread
);
1435 if (lp
->status_pending_p
)
1436 status
= lp
->status_pending
;
1439 /* If the thread had been suspended by gdbserver, and it stopped
1440 cleanly, then it'll have stopped with SIGSTOP. But we don't
1441 want to deliver that SIGSTOP. */
1442 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1443 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1446 /* Otherwise, we may need to deliver the signal we
1448 status
= lp
->last_status
;
1451 if (!WIFSTOPPED (status
))
1454 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1455 target_pid_to_str (ptid_of (thread
)));
1459 /* Extended wait statuses aren't real SIGTRAPs. */
1460 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1463 debug_printf ("GPS: lwp %s had stopped with extended "
1464 "status: no pending signal\n",
1465 target_pid_to_str (ptid_of (thread
)));
1469 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1471 if (program_signals_p
&& !program_signals
[signo
])
1474 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1475 target_pid_to_str (ptid_of (thread
)),
1476 gdb_signal_to_string (signo
));
1479 else if (!program_signals_p
1480 /* If we have no way to know which signals GDB does not
1481 want to have passed to the program, assume
1482 SIGTRAP/SIGINT, which is GDB's default. */
1483 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1486 debug_printf ("GPS: lwp %s had signal %s, "
1487 "but we don't know if we should pass it. "
1488 "Default to not.\n",
1489 target_pid_to_str (ptid_of (thread
)),
1490 gdb_signal_to_string (signo
));
1496 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1497 target_pid_to_str (ptid_of (thread
)),
1498 gdb_signal_to_string (signo
));
1500 return WSTOPSIG (status
);
1504 /* Detach from LWP. */
1507 linux_detach_one_lwp (struct lwp_info
*lwp
)
1509 struct thread_info
*thread
= get_lwp_thread (lwp
);
1513 /* If there is a pending SIGSTOP, get rid of it. */
1514 if (lwp
->stop_expected
)
1517 debug_printf ("Sending SIGCONT to %s\n",
1518 target_pid_to_str (ptid_of (thread
)));
1520 kill_lwp (lwpid_of (thread
), SIGCONT
);
1521 lwp
->stop_expected
= 0;
1524 /* Pass on any pending signal for this thread. */
1525 sig
= get_detach_signal (thread
);
1527 /* Preparing to resume may try to write registers, and fail if the
1528 lwp is zombie. If that happens, ignore the error. We'll handle
1529 it below, when detach fails with ESRCH. */
1532 /* Flush any pending changes to the process's registers. */
1533 regcache_invalidate_thread (thread
);
1535 /* Finally, let it resume. */
1536 if (the_low_target
.prepare_to_resume
!= NULL
)
1537 the_low_target
.prepare_to_resume (lwp
);
1539 CATCH (ex
, RETURN_MASK_ERROR
)
1541 if (!check_ptrace_stopped_lwp_gone (lwp
))
1542 throw_exception (ex
);
1546 lwpid
= lwpid_of (thread
);
1547 if (ptrace (PTRACE_DETACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0,
1548 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1550 int save_errno
= errno
;
1552 /* We know the thread exists, so ESRCH must mean the lwp is
1553 zombie. This can happen if one of the already-detached
1554 threads exits the whole thread group. In that case we're
1555 still attached, and must reap the lwp. */
1556 if (save_errno
== ESRCH
)
1560 ret
= my_waitpid (lwpid
, &status
, __WALL
);
1563 warning (_("Couldn't reap LWP %d while detaching: %s"),
1564 lwpid
, strerror (errno
));
1566 else if (!WIFEXITED (status
) && !WIFSIGNALED (status
))
1568 warning (_("Reaping LWP %d while detaching "
1569 "returned unexpected status 0x%x"),
1575 error (_("Can't detach %s: %s"),
1576 target_pid_to_str (ptid_of (thread
)),
1577 strerror (save_errno
));
1580 else if (debug_threads
)
1582 debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n",
1583 target_pid_to_str (ptid_of (thread
)),
1590 /* Callback for find_inferior. Detaches from non-leader threads of a
1594 linux_detach_lwp_callback (thread_info
*thread
, void *args
)
1596 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1597 int pid
= *(int *) args
;
1598 int lwpid
= lwpid_of (thread
);
1600 /* Skip other processes. */
1601 if (thread
->id
.pid () != pid
)
1604 /* We don't actually detach from the thread group leader just yet.
1605 If the thread group exits, we must reap the zombie clone lwps
1606 before we're able to reap the leader. */
1607 if (thread
->id
.pid () == lwpid
)
1610 linux_detach_one_lwp (lwp
);
1615 linux_detach (int pid
)
1617 struct process_info
*process
;
1618 struct lwp_info
*main_lwp
;
1620 process
= find_process_pid (pid
);
1621 if (process
== NULL
)
1624 /* As there's a step over already in progress, let it finish first,
1625 otherwise nesting a stabilize_threads operation on top gets real
1627 complete_ongoing_step_over ();
1629 /* Stop all threads before detaching. First, ptrace requires that
1630 the thread is stopped to sucessfully detach. Second, thread_db
1631 may need to uninstall thread event breakpoints from memory, which
1632 only works with a stopped process anyway. */
1633 stop_all_lwps (0, NULL
);
1635 #ifdef USE_THREAD_DB
1636 thread_db_detach (process
);
1639 /* Stabilize threads (move out of jump pads). */
1640 stabilize_threads ();
1642 /* Detach from the clone lwps first. If the thread group exits just
1643 while we're detaching, we must reap the clone lwps before we're
1644 able to reap the leader. */
1645 find_inferior (&all_threads
, linux_detach_lwp_callback
, &pid
);
1647 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1648 linux_detach_one_lwp (main_lwp
);
1650 the_target
->mourn (process
);
1652 /* Since we presently can only stop all lwps of all processes, we
1653 need to unstop lwps of other processes. */
1654 unstop_all_lwps (0, NULL
);
1658 /* Remove all LWPs that belong to process PROC from the lwp list. */
1661 delete_lwp_callback (thread_info
*thread
, void *proc
)
1663 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1664 struct process_info
*process
= (struct process_info
*) proc
;
1666 if (pid_of (thread
) == pid_of (process
))
1673 linux_mourn (struct process_info
*process
)
1675 struct process_info_private
*priv
;
1677 #ifdef USE_THREAD_DB
1678 thread_db_mourn (process
);
1681 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1683 /* Freeing all private data. */
1684 priv
= process
->priv
;
1685 if (the_low_target
.delete_process
!= NULL
)
1686 the_low_target
.delete_process (priv
->arch_private
);
1688 gdb_assert (priv
->arch_private
== NULL
);
1690 process
->priv
= NULL
;
1692 remove_process (process
);
1696 linux_join (int pid
)
1701 ret
= my_waitpid (pid
, &status
, 0);
1702 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1704 } while (ret
!= -1 || errno
!= ECHILD
);
1707 /* Return nonzero if the given thread is still alive. */
1709 linux_thread_alive (ptid_t ptid
)
1711 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1713 /* We assume we always know if a thread exits. If a whole process
1714 exited but we still haven't been able to report it to GDB, we'll
1715 hold on to the last lwp of the dead process. */
1717 return !lwp_is_marked_dead (lwp
);
1722 /* Return 1 if this lwp still has an interesting status pending. If
1723 not (e.g., it had stopped for a breakpoint that is gone), return
1727 thread_still_has_status_pending_p (struct thread_info
*thread
)
1729 struct lwp_info
*lp
= get_thread_lwp (thread
);
1731 if (!lp
->status_pending_p
)
1734 if (thread
->last_resume_kind
!= resume_stop
1735 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1736 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1738 struct thread_info
*saved_thread
;
1742 gdb_assert (lp
->last_status
!= 0);
1746 saved_thread
= current_thread
;
1747 current_thread
= thread
;
1749 if (pc
!= lp
->stop_pc
)
1752 debug_printf ("PC of %ld changed\n",
1757 #if !USE_SIGTRAP_SIGINFO
1758 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1759 && !(*the_low_target
.breakpoint_at
) (pc
))
1762 debug_printf ("previous SW breakpoint of %ld gone\n",
1766 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1767 && !hardware_breakpoint_inserted_here (pc
))
1770 debug_printf ("previous HW breakpoint of %ld gone\n",
1776 current_thread
= saved_thread
;
1781 debug_printf ("discarding pending breakpoint status\n");
1782 lp
->status_pending_p
= 0;
1790 /* Returns true if LWP is resumed from the client's perspective. */
1793 lwp_resumed (struct lwp_info
*lwp
)
1795 struct thread_info
*thread
= get_lwp_thread (lwp
);
1797 if (thread
->last_resume_kind
!= resume_stop
)
1800 /* Did gdb send us a `vCont;t', but we haven't reported the
1801 corresponding stop to gdb yet? If so, the thread is still
1802 resumed/running from gdb's perspective. */
1803 if (thread
->last_resume_kind
== resume_stop
1804 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1810 /* Return 1 if this lwp has an interesting status pending. */
1812 status_pending_p_callback (thread_info
*thread
, void *arg
)
1814 struct lwp_info
*lp
= get_thread_lwp (thread
);
1815 ptid_t ptid
= * (ptid_t
*) arg
;
1817 /* Check if we're only interested in events from a specific process
1818 or a specific LWP. */
1819 if (!ptid_match (ptid_of (thread
), ptid
))
1822 if (!lwp_resumed (lp
))
1825 if (lp
->status_pending_p
1826 && !thread_still_has_status_pending_p (thread
))
1828 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1832 return lp
->status_pending_p
;
1836 same_lwp (thread_info
*thread
, void *data
)
1838 ptid_t ptid
= *(ptid_t
*) data
;
1841 if (ptid_get_lwp (ptid
) != 0)
1842 lwp
= ptid_get_lwp (ptid
);
1844 lwp
= ptid_get_pid (ptid
);
1846 if (thread
->id
.lwp () == lwp
)
1853 find_lwp_pid (ptid_t ptid
)
1855 thread_info
*thread
= find_inferior (&all_threads
, same_lwp
, &ptid
);
1860 return get_thread_lwp (thread
);
1863 /* Return the number of known LWPs in the tgid given by PID. */
1870 for_each_thread (pid
, [&] (thread_info
*thread
)
1878 /* See nat/linux-nat.h. */
1881 iterate_over_lwps (ptid_t filter
,
1882 iterate_over_lwps_ftype callback
,
1885 thread_info
*thread
= find_thread (filter
, [&] (thread_info
*thread
)
1887 lwp_info
*lwp
= get_thread_lwp (thread
);
1889 return callback (lwp
, data
);
1895 return get_thread_lwp (thread
);
1898 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1899 their exits until all other threads in the group have exited. */
1902 check_zombie_leaders (void)
1904 for_each_process ([] (process_info
*proc
) {
1905 pid_t leader_pid
= pid_of (proc
);
1906 struct lwp_info
*leader_lp
;
1908 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1911 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1912 "num_lwps=%d, zombie=%d\n",
1913 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1914 linux_proc_pid_is_zombie (leader_pid
));
1916 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1917 /* Check if there are other threads in the group, as we may
1918 have raced with the inferior simply exiting. */
1919 && !last_thread_of_process_p (leader_pid
)
1920 && linux_proc_pid_is_zombie (leader_pid
))
1922 /* A leader zombie can mean one of two things:
1924 - It exited, and there's an exit status pending
1925 available, or only the leader exited (not the whole
1926 program). In the latter case, we can't waitpid the
1927 leader's exit status until all other threads are gone.
1929 - There are 3 or more threads in the group, and a thread
1930 other than the leader exec'd. On an exec, the Linux
1931 kernel destroys all other threads (except the execing
1932 one) in the thread group, and resets the execing thread's
1933 tid to the tgid. No exit notification is sent for the
1934 execing thread -- from the ptracer's perspective, it
1935 appears as though the execing thread just vanishes.
1936 Until we reap all other threads except the leader and the
1937 execing thread, the leader will be zombie, and the
1938 execing thread will be in `D (disc sleep)'. As soon as
1939 all other threads are reaped, the execing thread changes
1940 it's tid to the tgid, and the previous (zombie) leader
1941 vanishes, giving place to the "new" leader. We could try
1942 distinguishing the exit and exec cases, by waiting once
1943 more, and seeing if something comes out, but it doesn't
1944 sound useful. The previous leader _does_ go away, and
1945 we'll re-add the new one once we see the exec event
1946 (which is just the same as what would happen if the
1947 previous leader did exit voluntarily before some other
1951 debug_printf ("CZL: Thread group leader %d zombie "
1952 "(it exited, or another thread execd).\n",
1955 delete_lwp (leader_lp
);
1960 /* Callback for `find_inferior'. Returns the first LWP that is not
1961 stopped. ARG is a PTID filter. */
1964 not_stopped_callback (thread_info
*thread
, void *arg
)
1966 struct lwp_info
*lwp
;
1967 ptid_t filter
= *(ptid_t
*) arg
;
1969 if (!ptid_match (ptid_of (thread
), filter
))
1972 lwp
= get_thread_lwp (thread
);
1979 /* Increment LWP's suspend count. */
1982 lwp_suspended_inc (struct lwp_info
*lwp
)
1986 if (debug_threads
&& lwp
->suspended
> 4)
1988 struct thread_info
*thread
= get_lwp_thread (lwp
);
1990 debug_printf ("LWP %ld has a suspiciously high suspend count,"
1991 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
1995 /* Decrement LWP's suspend count. */
1998 lwp_suspended_decr (struct lwp_info
*lwp
)
2002 if (lwp
->suspended
< 0)
2004 struct thread_info
*thread
= get_lwp_thread (lwp
);
2006 internal_error (__FILE__
, __LINE__
,
2007 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
2012 /* This function should only be called if the LWP got a SIGTRAP.
2014 Handle any tracepoint steps or hits. Return true if a tracepoint
2015 event was handled, 0 otherwise. */
2018 handle_tracepoints (struct lwp_info
*lwp
)
2020 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
2021 int tpoint_related_event
= 0;
2023 gdb_assert (lwp
->suspended
== 0);
2025 /* If this tracepoint hit causes a tracing stop, we'll immediately
2026 uninsert tracepoints. To do this, we temporarily pause all
2027 threads, unpatch away, and then unpause threads. We need to make
2028 sure the unpausing doesn't resume LWP too. */
2029 lwp_suspended_inc (lwp
);
2031 /* And we need to be sure that any all-threads-stopping doesn't try
2032 to move threads out of the jump pads, as it could deadlock the
2033 inferior (LWP could be in the jump pad, maybe even holding the
2036 /* Do any necessary step collect actions. */
2037 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2039 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2041 /* See if we just hit a tracepoint and do its main collect
2043 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2045 lwp_suspended_decr (lwp
);
2047 gdb_assert (lwp
->suspended
== 0);
2048 gdb_assert (!stabilizing_threads
2049 || (lwp
->collecting_fast_tracepoint
2050 != fast_tpoint_collect_result::not_collecting
));
2052 if (tpoint_related_event
)
2055 debug_printf ("got a tracepoint event\n");
2062 /* Convenience wrapper. Returns information about LWP's fast tracepoint
2063 collection status. */
2065 static fast_tpoint_collect_result
2066 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2067 struct fast_tpoint_collect_status
*status
)
2069 CORE_ADDR thread_area
;
2070 struct thread_info
*thread
= get_lwp_thread (lwp
);
2072 if (the_low_target
.get_thread_area
== NULL
)
2073 return fast_tpoint_collect_result::not_collecting
;
2075 /* Get the thread area address. This is used to recognize which
2076 thread is which when tracing with the in-process agent library.
2077 We don't read anything from the address, and treat it as opaque;
2078 it's the address itself that we assume is unique per-thread. */
2079 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2080 return fast_tpoint_collect_result::not_collecting
;
2082 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2085 /* The reason we resume in the caller, is because we want to be able
2086 to pass lwp->status_pending as WSTAT, and we need to clear
2087 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2088 refuses to resume. */
2091 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2093 struct thread_info
*saved_thread
;
2095 saved_thread
= current_thread
;
2096 current_thread
= get_lwp_thread (lwp
);
2099 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2100 && supports_fast_tracepoints ()
2101 && agent_loaded_p ())
2103 struct fast_tpoint_collect_status status
;
2106 debug_printf ("Checking whether LWP %ld needs to move out of the "
2108 lwpid_of (current_thread
));
2110 fast_tpoint_collect_result r
2111 = linux_fast_tracepoint_collecting (lwp
, &status
);
2114 || (WSTOPSIG (*wstat
) != SIGILL
2115 && WSTOPSIG (*wstat
) != SIGFPE
2116 && WSTOPSIG (*wstat
) != SIGSEGV
2117 && WSTOPSIG (*wstat
) != SIGBUS
))
2119 lwp
->collecting_fast_tracepoint
= r
;
2121 if (r
!= fast_tpoint_collect_result::not_collecting
)
2123 if (r
== fast_tpoint_collect_result::before_insn
2124 && lwp
->exit_jump_pad_bkpt
== NULL
)
2126 /* Haven't executed the original instruction yet.
2127 Set breakpoint there, and wait till it's hit,
2128 then single-step until exiting the jump pad. */
2129 lwp
->exit_jump_pad_bkpt
2130 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2134 debug_printf ("Checking whether LWP %ld needs to move out of "
2135 "the jump pad...it does\n",
2136 lwpid_of (current_thread
));
2137 current_thread
= saved_thread
;
2144 /* If we get a synchronous signal while collecting, *and*
2145 while executing the (relocated) original instruction,
2146 reset the PC to point at the tpoint address, before
2147 reporting to GDB. Otherwise, it's an IPA lib bug: just
2148 report the signal to GDB, and pray for the best. */
2150 lwp
->collecting_fast_tracepoint
2151 = fast_tpoint_collect_result::not_collecting
;
2153 if (r
!= fast_tpoint_collect_result::not_collecting
2154 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2155 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2158 struct regcache
*regcache
;
2160 /* The si_addr on a few signals references the address
2161 of the faulting instruction. Adjust that as
2163 if ((WSTOPSIG (*wstat
) == SIGILL
2164 || WSTOPSIG (*wstat
) == SIGFPE
2165 || WSTOPSIG (*wstat
) == SIGBUS
2166 || WSTOPSIG (*wstat
) == SIGSEGV
)
2167 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2168 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2169 /* Final check just to make sure we don't clobber
2170 the siginfo of non-kernel-sent signals. */
2171 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2173 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2174 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2175 (PTRACE_TYPE_ARG3
) 0, &info
);
2178 regcache
= get_thread_regcache (current_thread
, 1);
2179 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2180 lwp
->stop_pc
= status
.tpoint_addr
;
2182 /* Cancel any fast tracepoint lock this thread was
2184 force_unlock_trace_buffer ();
2187 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2190 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2191 "stopping all threads momentarily.\n");
2193 stop_all_lwps (1, lwp
);
2195 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2196 lwp
->exit_jump_pad_bkpt
= NULL
;
2198 unstop_all_lwps (1, lwp
);
2200 gdb_assert (lwp
->suspended
>= 0);
2206 debug_printf ("Checking whether LWP %ld needs to move out of the "
2208 lwpid_of (current_thread
));
2210 current_thread
= saved_thread
;
2214 /* Enqueue one signal in the "signals to report later when out of the
2218 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2220 struct pending_signals
*p_sig
;
2221 struct thread_info
*thread
= get_lwp_thread (lwp
);
2224 debug_printf ("Deferring signal %d for LWP %ld.\n",
2225 WSTOPSIG (*wstat
), lwpid_of (thread
));
2229 struct pending_signals
*sig
;
2231 for (sig
= lwp
->pending_signals_to_report
;
2234 debug_printf (" Already queued %d\n",
2237 debug_printf (" (no more currently queued signals)\n");
2240 /* Don't enqueue non-RT signals if they are already in the deferred
2241 queue. (SIGSTOP being the easiest signal to see ending up here
2243 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2245 struct pending_signals
*sig
;
2247 for (sig
= lwp
->pending_signals_to_report
;
2251 if (sig
->signal
== WSTOPSIG (*wstat
))
2254 debug_printf ("Not requeuing already queued non-RT signal %d"
2263 p_sig
= XCNEW (struct pending_signals
);
2264 p_sig
->prev
= lwp
->pending_signals_to_report
;
2265 p_sig
->signal
= WSTOPSIG (*wstat
);
2267 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2270 lwp
->pending_signals_to_report
= p_sig
;
2273 /* Dequeue one signal from the "signals to report later when out of
2274 the jump pad" list. */
2277 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2279 struct thread_info
*thread
= get_lwp_thread (lwp
);
2281 if (lwp
->pending_signals_to_report
!= NULL
)
2283 struct pending_signals
**p_sig
;
2285 p_sig
= &lwp
->pending_signals_to_report
;
2286 while ((*p_sig
)->prev
!= NULL
)
2287 p_sig
= &(*p_sig
)->prev
;
2289 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2290 if ((*p_sig
)->info
.si_signo
!= 0)
2291 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2297 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2298 WSTOPSIG (*wstat
), lwpid_of (thread
));
2302 struct pending_signals
*sig
;
2304 for (sig
= lwp
->pending_signals_to_report
;
2307 debug_printf (" Still queued %d\n",
2310 debug_printf (" (no more queued signals)\n");
2319 /* Fetch the possibly triggered data watchpoint info and store it in
2322 On some archs, like x86, that use debug registers to set
2323 watchpoints, it's possible that the way to know which watched
2324 address trapped, is to check the register that is used to select
2325 which address to watch. Problem is, between setting the watchpoint
2326 and reading back which data address trapped, the user may change
2327 the set of watchpoints, and, as a consequence, GDB changes the
2328 debug registers in the inferior. To avoid reading back a stale
2329 stopped-data-address when that happens, we cache in LP the fact
2330 that a watchpoint trapped, and the corresponding data address, as
2331 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2332 registers meanwhile, we have the cached data we can rely on. */
2335 check_stopped_by_watchpoint (struct lwp_info
*child
)
2337 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2339 struct thread_info
*saved_thread
;
2341 saved_thread
= current_thread
;
2342 current_thread
= get_lwp_thread (child
);
2344 if (the_low_target
.stopped_by_watchpoint ())
2346 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2348 if (the_low_target
.stopped_data_address
!= NULL
)
2349 child
->stopped_data_address
2350 = the_low_target
.stopped_data_address ();
2352 child
->stopped_data_address
= 0;
2355 current_thread
= saved_thread
;
2358 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2361 /* Return the ptrace options that we want to try to enable. */
2364 linux_low_ptrace_options (int attached
)
2369 options
|= PTRACE_O_EXITKILL
;
2371 if (report_fork_events
)
2372 options
|= PTRACE_O_TRACEFORK
;
2374 if (report_vfork_events
)
2375 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2377 if (report_exec_events
)
2378 options
|= PTRACE_O_TRACEEXEC
;
2380 options
|= PTRACE_O_TRACESYSGOOD
;
2385 /* Do low-level handling of the event, and check if we should go on
2386 and pass it to caller code. Return the affected lwp if we are, or
2389 static struct lwp_info
*
2390 linux_low_filter_event (int lwpid
, int wstat
)
2392 struct lwp_info
*child
;
2393 struct thread_info
*thread
;
2394 int have_stop_pc
= 0;
2396 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2398 /* Check for stop events reported by a process we didn't already
2399 know about - anything not already in our LWP list.
2401 If we're expecting to receive stopped processes after
2402 fork, vfork, and clone events, then we'll just add the
2403 new one to our list and go back to waiting for the event
2404 to be reported - the stopped process might be returned
2405 from waitpid before or after the event is.
2407 But note the case of a non-leader thread exec'ing after the
2408 leader having exited, and gone from our lists (because
2409 check_zombie_leaders deleted it). The non-leader thread
2410 changes its tid to the tgid. */
2412 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2413 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2417 /* A multi-thread exec after we had seen the leader exiting. */
2420 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2421 "after exec.\n", lwpid
);
2424 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2425 child
= add_lwp (child_ptid
);
2427 current_thread
= child
->thread
;
2430 /* If we didn't find a process, one of two things presumably happened:
2431 - A process we started and then detached from has exited. Ignore it.
2432 - A process we are controlling has forked and the new child's stop
2433 was reported to us by the kernel. Save its PID. */
2434 if (child
== NULL
&& WIFSTOPPED (wstat
))
2436 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2439 else if (child
== NULL
)
2442 thread
= get_lwp_thread (child
);
2446 child
->last_status
= wstat
;
2448 /* Check if the thread has exited. */
2449 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2452 debug_printf ("LLFE: %d exited.\n", lwpid
);
2454 if (finish_step_over (child
))
2456 /* Unsuspend all other LWPs, and set them back running again. */
2457 unsuspend_all_lwps (child
);
2460 /* If there is at least one more LWP, then the exit signal was
2461 not the end of the debugged application and should be
2462 ignored, unless GDB wants to hear about thread exits. */
2463 if (report_thread_events
2464 || last_thread_of_process_p (pid_of (thread
)))
2466 /* Since events are serialized to GDB core, and we can't
2467 report this one right now. Leave the status pending for
2468 the next time we're able to report it. */
2469 mark_lwp_dead (child
, wstat
);
2479 gdb_assert (WIFSTOPPED (wstat
));
2481 if (WIFSTOPPED (wstat
))
2483 struct process_info
*proc
;
2485 /* Architecture-specific setup after inferior is running. */
2486 proc
= find_process_pid (pid_of (thread
));
2487 if (proc
->tdesc
== NULL
)
2491 /* This needs to happen after we have attached to the
2492 inferior and it is stopped for the first time, but
2493 before we access any inferior registers. */
2494 linux_arch_setup_thread (thread
);
2498 /* The process is started, but GDBserver will do
2499 architecture-specific setup after the program stops at
2500 the first instruction. */
2501 child
->status_pending_p
= 1;
2502 child
->status_pending
= wstat
;
2508 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2510 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2511 int options
= linux_low_ptrace_options (proc
->attached
);
2513 linux_enable_event_reporting (lwpid
, options
);
2514 child
->must_set_ptrace_flags
= 0;
2517 /* Always update syscall_state, even if it will be filtered later. */
2518 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2520 child
->syscall_state
2521 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2522 ? TARGET_WAITKIND_SYSCALL_RETURN
2523 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2527 /* Almost all other ptrace-stops are known to be outside of system
2528 calls, with further exceptions in handle_extended_wait. */
2529 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2532 /* Be careful to not overwrite stop_pc until save_stop_reason is
2534 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2535 && linux_is_extended_waitstatus (wstat
))
2537 child
->stop_pc
= get_pc (child
);
2538 if (handle_extended_wait (&child
, wstat
))
2540 /* The event has been handled, so just return without
2546 if (linux_wstatus_maybe_breakpoint (wstat
))
2548 if (save_stop_reason (child
))
2553 child
->stop_pc
= get_pc (child
);
2555 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2556 && child
->stop_expected
)
2559 debug_printf ("Expected stop.\n");
2560 child
->stop_expected
= 0;
2562 if (thread
->last_resume_kind
== resume_stop
)
2564 /* We want to report the stop to the core. Treat the
2565 SIGSTOP as a normal event. */
2567 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2568 target_pid_to_str (ptid_of (thread
)));
2570 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2572 /* Stopping threads. We don't want this SIGSTOP to end up
2575 debug_printf ("LLW: SIGSTOP caught for %s "
2576 "while stopping threads.\n",
2577 target_pid_to_str (ptid_of (thread
)));
2582 /* This is a delayed SIGSTOP. Filter out the event. */
2584 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2585 child
->stepping
? "step" : "continue",
2586 target_pid_to_str (ptid_of (thread
)));
2588 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2593 child
->status_pending_p
= 1;
2594 child
->status_pending
= wstat
;
2598 /* Return true if THREAD is doing hardware single step. */
2601 maybe_hw_step (struct thread_info
*thread
)
2603 if (can_hardware_single_step ())
2607 /* GDBserver must insert single-step breakpoint for software
2609 gdb_assert (has_single_step_breakpoints (thread
));
2614 /* Resume LWPs that are currently stopped without any pending status
2615 to report, but are resumed from the core's perspective. */
2618 resume_stopped_resumed_lwps (thread_info
*thread
)
2620 struct lwp_info
*lp
= get_thread_lwp (thread
);
2624 && !lp
->status_pending_p
2625 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2629 if (thread
->last_resume_kind
== resume_step
)
2630 step
= maybe_hw_step (thread
);
2633 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2634 target_pid_to_str (ptid_of (thread
)),
2635 paddress (lp
->stop_pc
),
2638 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2642 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2643 match FILTER_PTID (leaving others pending). The PTIDs can be:
2644 minus_one_ptid, to specify any child; a pid PTID, specifying all
2645 lwps of a thread group; or a PTID representing a single lwp. Store
2646 the stop status through the status pointer WSTAT. OPTIONS is
2647 passed to the waitpid call. Return 0 if no event was found and
2648 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2649 was found. Return the PID of the stopped child otherwise. */
2652 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2653 int *wstatp
, int options
)
2655 struct thread_info
*event_thread
;
2656 struct lwp_info
*event_child
, *requested_child
;
2657 sigset_t block_mask
, prev_mask
;
2660 /* N.B. event_thread points to the thread_info struct that contains
2661 event_child. Keep them in sync. */
2662 event_thread
= NULL
;
2664 requested_child
= NULL
;
2666 /* Check for a lwp with a pending status. */
2668 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2670 event_thread
= (struct thread_info
*)
2671 find_inferior_in_random (&all_threads
, status_pending_p_callback
,
2673 if (event_thread
!= NULL
)
2674 event_child
= get_thread_lwp (event_thread
);
2675 if (debug_threads
&& event_thread
)
2676 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2678 else if (!ptid_equal (filter_ptid
, null_ptid
))
2680 requested_child
= find_lwp_pid (filter_ptid
);
2682 if (stopping_threads
== NOT_STOPPING_THREADS
2683 && requested_child
->status_pending_p
2684 && (requested_child
->collecting_fast_tracepoint
2685 != fast_tpoint_collect_result::not_collecting
))
2687 enqueue_one_deferred_signal (requested_child
,
2688 &requested_child
->status_pending
);
2689 requested_child
->status_pending_p
= 0;
2690 requested_child
->status_pending
= 0;
2691 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2694 if (requested_child
->suspended
2695 && requested_child
->status_pending_p
)
2697 internal_error (__FILE__
, __LINE__
,
2698 "requesting an event out of a"
2699 " suspended child?");
2702 if (requested_child
->status_pending_p
)
2704 event_child
= requested_child
;
2705 event_thread
= get_lwp_thread (event_child
);
2709 if (event_child
!= NULL
)
2712 debug_printf ("Got an event from pending child %ld (%04x)\n",
2713 lwpid_of (event_thread
), event_child
->status_pending
);
2714 *wstatp
= event_child
->status_pending
;
2715 event_child
->status_pending_p
= 0;
2716 event_child
->status_pending
= 0;
2717 current_thread
= event_thread
;
2718 return lwpid_of (event_thread
);
2721 /* But if we don't find a pending event, we'll have to wait.
2723 We only enter this loop if no process has a pending wait status.
2724 Thus any action taken in response to a wait status inside this
2725 loop is responding as soon as we detect the status, not after any
2728 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2729 all signals while here. */
2730 sigfillset (&block_mask
);
2731 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2733 /* Always pull all events out of the kernel. We'll randomly select
2734 an event LWP out of all that have events, to prevent
2736 while (event_child
== NULL
)
2740 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2743 - If the thread group leader exits while other threads in the
2744 thread group still exist, waitpid(TGID, ...) hangs. That
2745 waitpid won't return an exit status until the other threads
2746 in the group are reaped.
2748 - When a non-leader thread execs, that thread just vanishes
2749 without reporting an exit (so we'd hang if we waited for it
2750 explicitly in that case). The exec event is reported to
2753 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2756 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2757 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2763 debug_printf ("LLW: waitpid %ld received %s\n",
2764 (long) ret
, status_to_str (*wstatp
));
2767 /* Filter all events. IOW, leave all events pending. We'll
2768 randomly select an event LWP out of all that have events
2770 linux_low_filter_event (ret
, *wstatp
);
2771 /* Retry until nothing comes out of waitpid. A single
2772 SIGCHLD can indicate more than one child stopped. */
2776 /* Now that we've pulled all events out of the kernel, resume
2777 LWPs that don't have an interesting event to report. */
2778 if (stopping_threads
== NOT_STOPPING_THREADS
)
2779 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2781 /* ... and find an LWP with a status to report to the core, if
2783 event_thread
= (struct thread_info
*)
2784 find_inferior_in_random (&all_threads
, status_pending_p_callback
,
2786 if (event_thread
!= NULL
)
2788 event_child
= get_thread_lwp (event_thread
);
2789 *wstatp
= event_child
->status_pending
;
2790 event_child
->status_pending_p
= 0;
2791 event_child
->status_pending
= 0;
2795 /* Check for zombie thread group leaders. Those can't be reaped
2796 until all other threads in the thread group are. */
2797 check_zombie_leaders ();
2799 /* If there are no resumed children left in the set of LWPs we
2800 want to wait for, bail. We can't just block in
2801 waitpid/sigsuspend, because lwps might have been left stopped
2802 in trace-stop state, and we'd be stuck forever waiting for
2803 their status to change (which would only happen if we resumed
2804 them). Even if WNOHANG is set, this return code is preferred
2805 over 0 (below), as it is more detailed. */
2806 if ((find_inferior (&all_threads
,
2807 not_stopped_callback
,
2808 &wait_ptid
) == NULL
))
2811 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2812 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2816 /* No interesting event to report to the caller. */
2817 if ((options
& WNOHANG
))
2820 debug_printf ("WNOHANG set, no event found\n");
2822 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2826 /* Block until we get an event reported with SIGCHLD. */
2828 debug_printf ("sigsuspend'ing\n");
2830 sigsuspend (&prev_mask
);
2831 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2835 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2837 current_thread
= event_thread
;
2839 return lwpid_of (event_thread
);
2842 /* Wait for an event from child(ren) PTID. PTIDs can be:
2843 minus_one_ptid, to specify any child; a pid PTID, specifying all
2844 lwps of a thread group; or a PTID representing a single lwp. Store
2845 the stop status through the status pointer WSTAT. OPTIONS is
2846 passed to the waitpid call. Return 0 if no event was found and
2847 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2848 was found. Return the PID of the stopped child otherwise. */
2851 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2853 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2856 /* Count the LWP's that have had events. */
2859 count_events_callback (thread_info
*thread
, void *data
)
2861 struct lwp_info
*lp
= get_thread_lwp (thread
);
2862 int *count
= (int *) data
;
2864 gdb_assert (count
!= NULL
);
2866 /* Count only resumed LWPs that have an event pending. */
2867 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2868 && lp
->status_pending_p
)
2874 /* Select the LWP (if any) that is currently being single-stepped. */
2877 select_singlestep_lwp_callback (thread_info
*thread
, void *data
)
2879 struct lwp_info
*lp
= get_thread_lwp (thread
);
2881 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2882 && thread
->last_resume_kind
== resume_step
2883 && lp
->status_pending_p
)
2889 /* Select the Nth LWP that has had an event. */
2892 select_event_lwp_callback (thread_info
*thread
, void *data
)
2894 struct lwp_info
*lp
= get_thread_lwp (thread
);
2895 int *selector
= (int *) data
;
2897 gdb_assert (selector
!= NULL
);
2899 /* Select only resumed LWPs that have an event pending. */
2900 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2901 && lp
->status_pending_p
)
2902 if ((*selector
)-- == 0)
2908 /* Select one LWP out of those that have events pending. */
2911 select_event_lwp (struct lwp_info
**orig_lp
)
2914 int random_selector
;
2915 struct thread_info
*event_thread
= NULL
;
2917 /* In all-stop, give preference to the LWP that is being
2918 single-stepped. There will be at most one, and it's the LWP that
2919 the core is most interested in. If we didn't do this, then we'd
2920 have to handle pending step SIGTRAPs somehow in case the core
2921 later continues the previously-stepped thread, otherwise we'd
2922 report the pending SIGTRAP, and the core, not having stepped the
2923 thread, wouldn't understand what the trap was for, and therefore
2924 would report it to the user as a random signal. */
2928 = (struct thread_info
*) find_inferior (&all_threads
,
2929 select_singlestep_lwp_callback
,
2931 if (event_thread
!= NULL
)
2934 debug_printf ("SEL: Select single-step %s\n",
2935 target_pid_to_str (ptid_of (event_thread
)));
2938 if (event_thread
== NULL
)
2940 /* No single-stepping LWP. Select one at random, out of those
2941 which have had events. */
2943 /* First see how many events we have. */
2944 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2945 gdb_assert (num_events
> 0);
2947 /* Now randomly pick a LWP out of those that have had
2949 random_selector
= (int)
2950 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2952 if (debug_threads
&& num_events
> 1)
2953 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2954 num_events
, random_selector
);
2957 = (struct thread_info
*) find_inferior (&all_threads
,
2958 select_event_lwp_callback
,
2962 if (event_thread
!= NULL
)
2964 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2966 /* Switch the event LWP. */
2967 *orig_lp
= event_lp
;
2971 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2975 unsuspend_all_lwps (struct lwp_info
*except
)
2977 for_each_thread ([&] (thread_info
*thread
)
2979 lwp_info
*lwp
= get_thread_lwp (thread
);
2982 lwp_suspended_decr (lwp
);
2986 static void move_out_of_jump_pad_callback (thread_info
*thread
);
2987 static bool stuck_in_jump_pad_callback (thread_info
*thread
);
2988 static int lwp_running (thread_info
*thread
, void *data
);
2989 static ptid_t
linux_wait_1 (ptid_t ptid
,
2990 struct target_waitstatus
*ourstatus
,
2991 int target_options
);
2993 /* Stabilize threads (move out of jump pads).
2995 If a thread is midway collecting a fast tracepoint, we need to
2996 finish the collection and move it out of the jump pad before
2997 reporting the signal.
2999 This avoids recursion while collecting (when a signal arrives
3000 midway, and the signal handler itself collects), which would trash
3001 the trace buffer. In case the user set a breakpoint in a signal
3002 handler, this avoids the backtrace showing the jump pad, etc..
3003 Most importantly, there are certain things we can't do safely if
3004 threads are stopped in a jump pad (or in its callee's). For
3007 - starting a new trace run. A thread still collecting the
3008 previous run, could trash the trace buffer when resumed. The trace
3009 buffer control structures would have been reset but the thread had
3010 no way to tell. The thread could even midway memcpy'ing to the
3011 buffer, which would mean that when resumed, it would clobber the
3012 trace buffer that had been set for a new run.
3014 - we can't rewrite/reuse the jump pads for new tracepoints
3015 safely. Say you do tstart while a thread is stopped midway while
3016 collecting. When the thread is later resumed, it finishes the
3017 collection, and returns to the jump pad, to execute the original
3018 instruction that was under the tracepoint jump at the time the
3019 older run had been started. If the jump pad had been rewritten
3020 since for something else in the new run, the thread would now
3021 execute the wrong / random instructions. */
3024 linux_stabilize_threads (void)
3026 thread_info
*thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
3028 if (thread_stuck
!= NULL
)
3031 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
3032 lwpid_of (thread_stuck
));
3036 thread_info
*saved_thread
= current_thread
;
3038 stabilizing_threads
= 1;
3041 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
3043 /* Loop until all are stopped out of the jump pads. */
3044 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
3046 struct target_waitstatus ourstatus
;
3047 struct lwp_info
*lwp
;
3050 /* Note that we go through the full wait even loop. While
3051 moving threads out of jump pad, we need to be able to step
3052 over internal breakpoints and such. */
3053 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
3055 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
3057 lwp
= get_thread_lwp (current_thread
);
3060 lwp_suspended_inc (lwp
);
3062 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3063 || current_thread
->last_resume_kind
== resume_stop
)
3065 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3066 enqueue_one_deferred_signal (lwp
, &wstat
);
3071 unsuspend_all_lwps (NULL
);
3073 stabilizing_threads
= 0;
3075 current_thread
= saved_thread
;
3079 thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
3081 if (thread_stuck
!= NULL
)
3082 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3083 lwpid_of (thread_stuck
));
3087 /* Convenience function that is called when the kernel reports an
3088 event that is not passed out to GDB. */
3091 ignore_event (struct target_waitstatus
*ourstatus
)
3093 /* If we got an event, there may still be others, as a single
3094 SIGCHLD can indicate more than one child stopped. This forces
3095 another target_wait call. */
3098 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3102 /* Convenience function that is called when the kernel reports an exit
3103 event. This decides whether to report the event to GDB as a
3104 process exit event, a thread exit event, or to suppress the
3108 filter_exit_event (struct lwp_info
*event_child
,
3109 struct target_waitstatus
*ourstatus
)
3111 struct thread_info
*thread
= get_lwp_thread (event_child
);
3112 ptid_t ptid
= ptid_of (thread
);
3114 if (!last_thread_of_process_p (pid_of (thread
)))
3116 if (report_thread_events
)
3117 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3119 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3121 delete_lwp (event_child
);
3126 /* Returns 1 if GDB is interested in any event_child syscalls. */
3129 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3131 struct thread_info
*thread
= get_lwp_thread (event_child
);
3132 struct process_info
*proc
= get_thread_process (thread
);
3134 return !proc
->syscalls_to_catch
.empty ();
3137 /* Returns 1 if GDB is interested in the event_child syscall.
3138 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3141 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3144 struct thread_info
*thread
= get_lwp_thread (event_child
);
3145 struct process_info
*proc
= get_thread_process (thread
);
3147 if (proc
->syscalls_to_catch
.empty ())
3150 if (proc
->syscalls_to_catch
[0] == ANY_SYSCALL
)
3153 get_syscall_trapinfo (event_child
, &sysno
);
3155 for (int iter
: proc
->syscalls_to_catch
)
3162 /* Wait for process, returns status. */
3165 linux_wait_1 (ptid_t ptid
,
3166 struct target_waitstatus
*ourstatus
, int target_options
)
3169 struct lwp_info
*event_child
;
3172 int step_over_finished
;
3173 int bp_explains_trap
;
3174 int maybe_internal_trap
;
3183 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3186 /* Translate generic target options into linux options. */
3188 if (target_options
& TARGET_WNOHANG
)
3191 bp_explains_trap
= 0;
3194 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3196 /* Find a resumed LWP, if any. */
3197 if (find_inferior (&all_threads
,
3198 status_pending_p_callback
,
3199 &minus_one_ptid
) != NULL
)
3201 else if ((find_inferior (&all_threads
,
3202 not_stopped_callback
,
3203 &minus_one_ptid
) != NULL
))
3208 if (ptid_equal (step_over_bkpt
, null_ptid
))
3209 pid
= linux_wait_for_event (ptid
, &w
, options
);
3213 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3214 target_pid_to_str (step_over_bkpt
));
3215 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3218 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3220 gdb_assert (target_options
& TARGET_WNOHANG
);
3224 debug_printf ("linux_wait_1 ret = null_ptid, "
3225 "TARGET_WAITKIND_IGNORE\n");
3229 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3236 debug_printf ("linux_wait_1 ret = null_ptid, "
3237 "TARGET_WAITKIND_NO_RESUMED\n");
3241 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3245 event_child
= get_thread_lwp (current_thread
);
3247 /* linux_wait_for_event only returns an exit status for the last
3248 child of a process. Report it. */
3249 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3253 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3254 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3258 debug_printf ("linux_wait_1 ret = %s, exited with "
3260 target_pid_to_str (ptid_of (current_thread
)),
3267 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3268 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3272 debug_printf ("linux_wait_1 ret = %s, terminated with "
3274 target_pid_to_str (ptid_of (current_thread
)),
3280 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3281 return filter_exit_event (event_child
, ourstatus
);
3283 return ptid_of (current_thread
);
3286 /* If step-over executes a breakpoint instruction, in the case of a
3287 hardware single step it means a gdb/gdbserver breakpoint had been
3288 planted on top of a permanent breakpoint, in the case of a software
3289 single step it may just mean that gdbserver hit the reinsert breakpoint.
3290 The PC has been adjusted by save_stop_reason to point at
3291 the breakpoint address.
3292 So in the case of the hardware single step advance the PC manually
3293 past the breakpoint and in the case of software single step advance only
3294 if it's not the single_step_breakpoint we are hitting.
3295 This avoids that a program would keep trapping a permanent breakpoint
3297 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3298 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3299 && (event_child
->stepping
3300 || !single_step_breakpoint_inserted_here (event_child
->stop_pc
)))
3302 int increment_pc
= 0;
3303 int breakpoint_kind
= 0;
3304 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3307 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3308 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3312 debug_printf ("step-over for %s executed software breakpoint\n",
3313 target_pid_to_str (ptid_of (current_thread
)));
3316 if (increment_pc
!= 0)
3318 struct regcache
*regcache
3319 = get_thread_regcache (current_thread
, 1);
3321 event_child
->stop_pc
+= increment_pc
;
3322 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3324 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3325 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3329 /* If this event was not handled before, and is not a SIGTRAP, we
3330 report it. SIGILL and SIGSEGV are also treated as traps in case
3331 a breakpoint is inserted at the current PC. If this target does
3332 not support internal breakpoints at all, we also report the
3333 SIGTRAP without further processing; it's of no concern to us. */
3335 = (supports_breakpoints ()
3336 && (WSTOPSIG (w
) == SIGTRAP
3337 || ((WSTOPSIG (w
) == SIGILL
3338 || WSTOPSIG (w
) == SIGSEGV
)
3339 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3341 if (maybe_internal_trap
)
3343 /* Handle anything that requires bookkeeping before deciding to
3344 report the event or continue waiting. */
3346 /* First check if we can explain the SIGTRAP with an internal
3347 breakpoint, or if we should possibly report the event to GDB.
3348 Do this before anything that may remove or insert a
3350 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3352 /* We have a SIGTRAP, possibly a step-over dance has just
3353 finished. If so, tweak the state machine accordingly,
3354 reinsert breakpoints and delete any single-step
3356 step_over_finished
= finish_step_over (event_child
);
3358 /* Now invoke the callbacks of any internal breakpoints there. */
3359 check_breakpoints (event_child
->stop_pc
);
3361 /* Handle tracepoint data collecting. This may overflow the
3362 trace buffer, and cause a tracing stop, removing
3364 trace_event
= handle_tracepoints (event_child
);
3366 if (bp_explains_trap
)
3369 debug_printf ("Hit a gdbserver breakpoint.\n");
3374 /* We have some other signal, possibly a step-over dance was in
3375 progress, and it should be cancelled too. */
3376 step_over_finished
= finish_step_over (event_child
);
3379 /* We have all the data we need. Either report the event to GDB, or
3380 resume threads and keep waiting for more. */
3382 /* If we're collecting a fast tracepoint, finish the collection and
3383 move out of the jump pad before delivering a signal. See
3384 linux_stabilize_threads. */
3387 && WSTOPSIG (w
) != SIGTRAP
3388 && supports_fast_tracepoints ()
3389 && agent_loaded_p ())
3392 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3393 "to defer or adjust it.\n",
3394 WSTOPSIG (w
), lwpid_of (current_thread
));
3396 /* Allow debugging the jump pad itself. */
3397 if (current_thread
->last_resume_kind
!= resume_step
3398 && maybe_move_out_of_jump_pad (event_child
, &w
))
3400 enqueue_one_deferred_signal (event_child
, &w
);
3403 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3404 WSTOPSIG (w
), lwpid_of (current_thread
));
3406 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3410 return ignore_event (ourstatus
);
3414 if (event_child
->collecting_fast_tracepoint
3415 != fast_tpoint_collect_result::not_collecting
)
3418 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3419 "Check if we're already there.\n",
3420 lwpid_of (current_thread
),
3421 (int) event_child
->collecting_fast_tracepoint
);
3425 event_child
->collecting_fast_tracepoint
3426 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3428 if (event_child
->collecting_fast_tracepoint
3429 != fast_tpoint_collect_result::before_insn
)
3431 /* No longer need this breakpoint. */
3432 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3435 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3436 "stopping all threads momentarily.\n");
3438 /* Other running threads could hit this breakpoint.
3439 We don't handle moribund locations like GDB does,
3440 instead we always pause all threads when removing
3441 breakpoints, so that any step-over or
3442 decr_pc_after_break adjustment is always taken
3443 care of while the breakpoint is still
3445 stop_all_lwps (1, event_child
);
3447 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3448 event_child
->exit_jump_pad_bkpt
= NULL
;
3450 unstop_all_lwps (1, event_child
);
3452 gdb_assert (event_child
->suspended
>= 0);
3456 if (event_child
->collecting_fast_tracepoint
3457 == fast_tpoint_collect_result::not_collecting
)
3460 debug_printf ("fast tracepoint finished "
3461 "collecting successfully.\n");
3463 /* We may have a deferred signal to report. */
3464 if (dequeue_one_deferred_signal (event_child
, &w
))
3467 debug_printf ("dequeued one signal.\n");
3472 debug_printf ("no deferred signals.\n");
3474 if (stabilizing_threads
)
3476 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3477 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3481 debug_printf ("linux_wait_1 ret = %s, stopped "
3482 "while stabilizing threads\n",
3483 target_pid_to_str (ptid_of (current_thread
)));
3487 return ptid_of (current_thread
);
3493 /* Check whether GDB would be interested in this event. */
3495 /* Check if GDB is interested in this syscall. */
3497 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3498 && !gdb_catch_this_syscall_p (event_child
))
3502 debug_printf ("Ignored syscall for LWP %ld.\n",
3503 lwpid_of (current_thread
));
3506 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3511 return ignore_event (ourstatus
);
3514 /* If GDB is not interested in this signal, don't stop other
3515 threads, and don't report it to GDB. Just resume the inferior
3516 right away. We do this for threading-related signals as well as
3517 any that GDB specifically requested we ignore. But never ignore
3518 SIGSTOP if we sent it ourselves, and do not ignore signals when
3519 stepping - they may require special handling to skip the signal
3520 handler. Also never ignore signals that could be caused by a
3523 && current_thread
->last_resume_kind
!= resume_step
3525 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3526 (current_process ()->priv
->thread_db
!= NULL
3527 && (WSTOPSIG (w
) == __SIGRTMIN
3528 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3531 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3532 && !(WSTOPSIG (w
) == SIGSTOP
3533 && current_thread
->last_resume_kind
== resume_stop
)
3534 && !linux_wstatus_maybe_breakpoint (w
))))
3536 siginfo_t info
, *info_p
;
3539 debug_printf ("Ignored signal %d for LWP %ld.\n",
3540 WSTOPSIG (w
), lwpid_of (current_thread
));
3542 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3543 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3548 if (step_over_finished
)
3550 /* We cancelled this thread's step-over above. We still
3551 need to unsuspend all other LWPs, and set them back
3552 running again while the signal handler runs. */
3553 unsuspend_all_lwps (event_child
);
3555 /* Enqueue the pending signal info so that proceed_all_lwps
3557 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3559 proceed_all_lwps ();
3563 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3564 WSTOPSIG (w
), info_p
);
3570 return ignore_event (ourstatus
);
3573 /* Note that all addresses are always "out of the step range" when
3574 there's no range to begin with. */
3575 in_step_range
= lwp_in_step_range (event_child
);
3577 /* If GDB wanted this thread to single step, and the thread is out
3578 of the step range, we always want to report the SIGTRAP, and let
3579 GDB handle it. Watchpoints should always be reported. So should
3580 signals we can't explain. A SIGTRAP we can't explain could be a
3581 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3582 do, we're be able to handle GDB breakpoints on top of internal
3583 breakpoints, by handling the internal breakpoint and still
3584 reporting the event to GDB. If we don't, we're out of luck, GDB
3585 won't see the breakpoint hit. If we see a single-step event but
3586 the thread should be continuing, don't pass the trap to gdb.
3587 That indicates that we had previously finished a single-step but
3588 left the single-step pending -- see
3589 complete_ongoing_step_over. */
3590 report_to_gdb
= (!maybe_internal_trap
3591 || (current_thread
->last_resume_kind
== resume_step
3593 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3595 && !bp_explains_trap
3597 && !step_over_finished
3598 && !(current_thread
->last_resume_kind
== resume_continue
3599 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3600 || (gdb_breakpoint_here (event_child
->stop_pc
)
3601 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3602 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3603 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3605 run_breakpoint_commands (event_child
->stop_pc
);
3607 /* We found no reason GDB would want us to stop. We either hit one
3608 of our own breakpoints, or finished an internal step GDB
3609 shouldn't know about. */
3614 if (bp_explains_trap
)
3615 debug_printf ("Hit a gdbserver breakpoint.\n");
3616 if (step_over_finished
)
3617 debug_printf ("Step-over finished.\n");
3619 debug_printf ("Tracepoint event.\n");
3620 if (lwp_in_step_range (event_child
))
3621 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3622 paddress (event_child
->stop_pc
),
3623 paddress (event_child
->step_range_start
),
3624 paddress (event_child
->step_range_end
));
3627 /* We're not reporting this breakpoint to GDB, so apply the
3628 decr_pc_after_break adjustment to the inferior's regcache
3631 if (the_low_target
.set_pc
!= NULL
)
3633 struct regcache
*regcache
3634 = get_thread_regcache (current_thread
, 1);
3635 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3638 if (step_over_finished
)
3640 /* If we have finished stepping over a breakpoint, we've
3641 stopped and suspended all LWPs momentarily except the
3642 stepping one. This is where we resume them all again.
3643 We're going to keep waiting, so use proceed, which
3644 handles stepping over the next breakpoint. */
3645 unsuspend_all_lwps (event_child
);
3649 /* Remove the single-step breakpoints if any. Note that
3650 there isn't single-step breakpoint if we finished stepping
3652 if (can_software_single_step ()
3653 && has_single_step_breakpoints (current_thread
))
3655 stop_all_lwps (0, event_child
);
3656 delete_single_step_breakpoints (current_thread
);
3657 unstop_all_lwps (0, event_child
);
3662 debug_printf ("proceeding all threads.\n");
3663 proceed_all_lwps ();
3668 return ignore_event (ourstatus
);
3673 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3676 = target_waitstatus_to_string (&event_child
->waitstatus
);
3678 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3679 lwpid_of (get_lwp_thread (event_child
)), str
.c_str ());
3681 if (current_thread
->last_resume_kind
== resume_step
)
3683 if (event_child
->step_range_start
== event_child
->step_range_end
)
3684 debug_printf ("GDB wanted to single-step, reporting event.\n");
3685 else if (!lwp_in_step_range (event_child
))
3686 debug_printf ("Out of step range, reporting event.\n");
3688 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3689 debug_printf ("Stopped by watchpoint.\n");
3690 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3691 debug_printf ("Stopped by GDB breakpoint.\n");
3693 debug_printf ("Hit a non-gdbserver trap event.\n");
3696 /* Alright, we're going to report a stop. */
3698 /* Remove single-step breakpoints. */
3699 if (can_software_single_step ())
3701 /* Remove single-step breakpoints or not. It it is true, stop all
3702 lwps, so that other threads won't hit the breakpoint in the
3704 int remove_single_step_breakpoints_p
= 0;
3708 remove_single_step_breakpoints_p
3709 = has_single_step_breakpoints (current_thread
);
3713 /* In all-stop, a stop reply cancels all previous resume
3714 requests. Delete all single-step breakpoints. */
3716 find_thread ([&] (thread_info
*thread
) {
3717 if (has_single_step_breakpoints (thread
))
3719 remove_single_step_breakpoints_p
= 1;
3727 if (remove_single_step_breakpoints_p
)
3729 /* If we remove single-step breakpoints from memory, stop all lwps,
3730 so that other threads won't hit the breakpoint in the staled
3732 stop_all_lwps (0, event_child
);
3736 gdb_assert (has_single_step_breakpoints (current_thread
));
3737 delete_single_step_breakpoints (current_thread
);
3741 for_each_thread ([] (thread_info
*thread
){
3742 if (has_single_step_breakpoints (thread
))
3743 delete_single_step_breakpoints (thread
);
3747 unstop_all_lwps (0, event_child
);
3751 if (!stabilizing_threads
)
3753 /* In all-stop, stop all threads. */
3755 stop_all_lwps (0, NULL
);
3757 if (step_over_finished
)
3761 /* If we were doing a step-over, all other threads but
3762 the stepping one had been paused in start_step_over,
3763 with their suspend counts incremented. We don't want
3764 to do a full unstop/unpause, because we're in
3765 all-stop mode (so we want threads stopped), but we
3766 still need to unsuspend the other threads, to
3767 decrement their `suspended' count back. */
3768 unsuspend_all_lwps (event_child
);
3772 /* If we just finished a step-over, then all threads had
3773 been momentarily paused. In all-stop, that's fine,
3774 we want threads stopped by now anyway. In non-stop,
3775 we need to re-resume threads that GDB wanted to be
3777 unstop_all_lwps (1, event_child
);
3781 /* If we're not waiting for a specific LWP, choose an event LWP
3782 from among those that have had events. Giving equal priority
3783 to all LWPs that have had events helps prevent
3785 if (ptid_equal (ptid
, minus_one_ptid
))
3787 event_child
->status_pending_p
= 1;
3788 event_child
->status_pending
= w
;
3790 select_event_lwp (&event_child
);
3792 /* current_thread and event_child must stay in sync. */
3793 current_thread
= get_lwp_thread (event_child
);
3795 event_child
->status_pending_p
= 0;
3796 w
= event_child
->status_pending
;
3800 /* Stabilize threads (move out of jump pads). */
3802 stabilize_threads ();
3806 /* If we just finished a step-over, then all threads had been
3807 momentarily paused. In all-stop, that's fine, we want
3808 threads stopped by now anyway. In non-stop, we need to
3809 re-resume threads that GDB wanted to be running. */
3810 if (step_over_finished
)
3811 unstop_all_lwps (1, event_child
);
3814 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3816 /* If the reported event is an exit, fork, vfork or exec, let
3819 /* Break the unreported fork relationship chain. */
3820 if (event_child
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
3821 || event_child
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
)
3823 event_child
->fork_relative
->fork_relative
= NULL
;
3824 event_child
->fork_relative
= NULL
;
3827 *ourstatus
= event_child
->waitstatus
;
3828 /* Clear the event lwp's waitstatus since we handled it already. */
3829 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3832 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3834 /* Now that we've selected our final event LWP, un-adjust its PC if
3835 it was a software breakpoint, and the client doesn't know we can
3836 adjust the breakpoint ourselves. */
3837 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3838 && !swbreak_feature
)
3840 int decr_pc
= the_low_target
.decr_pc_after_break
;
3844 struct regcache
*regcache
3845 = get_thread_regcache (current_thread
, 1);
3846 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3850 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3852 get_syscall_trapinfo (event_child
,
3853 &ourstatus
->value
.syscall_number
);
3854 ourstatus
->kind
= event_child
->syscall_state
;
3856 else if (current_thread
->last_resume_kind
== resume_stop
3857 && WSTOPSIG (w
) == SIGSTOP
)
3859 /* A thread that has been requested to stop by GDB with vCont;t,
3860 and it stopped cleanly, so report as SIG0. The use of
3861 SIGSTOP is an implementation detail. */
3862 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3864 else if (current_thread
->last_resume_kind
== resume_stop
3865 && WSTOPSIG (w
) != SIGSTOP
)
3867 /* A thread that has been requested to stop by GDB with vCont;t,
3868 but, it stopped for other reasons. */
3869 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3871 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3873 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3876 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3880 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3881 target_pid_to_str (ptid_of (current_thread
)),
3882 ourstatus
->kind
, ourstatus
->value
.sig
);
3886 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3887 return filter_exit_event (event_child
, ourstatus
);
3889 return ptid_of (current_thread
);
3892 /* Get rid of any pending event in the pipe. */
3894 async_file_flush (void)
3900 ret
= read (linux_event_pipe
[0], &buf
, 1);
3901 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3904 /* Put something in the pipe, so the event loop wakes up. */
3906 async_file_mark (void)
3910 async_file_flush ();
3913 ret
= write (linux_event_pipe
[1], "+", 1);
3914 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3916 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3917 be awakened anyway. */
3921 linux_wait (ptid_t ptid
,
3922 struct target_waitstatus
*ourstatus
, int target_options
)
3926 /* Flush the async file first. */
3927 if (target_is_async_p ())
3928 async_file_flush ();
3932 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3934 while ((target_options
& TARGET_WNOHANG
) == 0
3935 && ptid_equal (event_ptid
, null_ptid
)
3936 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3938 /* If at least one stop was reported, there may be more. A single
3939 SIGCHLD can signal more than one child stop. */
3940 if (target_is_async_p ()
3941 && (target_options
& TARGET_WNOHANG
) != 0
3942 && !ptid_equal (event_ptid
, null_ptid
))
3948 /* Send a signal to an LWP. */
3951 kill_lwp (unsigned long lwpid
, int signo
)
3956 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3957 if (errno
== ENOSYS
)
3959 /* If tkill fails, then we are not using nptl threads, a
3960 configuration we no longer support. */
3961 perror_with_name (("tkill"));
3967 linux_stop_lwp (struct lwp_info
*lwp
)
3973 send_sigstop (struct lwp_info
*lwp
)
3977 pid
= lwpid_of (get_lwp_thread (lwp
));
3979 /* If we already have a pending stop signal for this process, don't
3981 if (lwp
->stop_expected
)
3984 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3990 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3992 lwp
->stop_expected
= 1;
3993 kill_lwp (pid
, SIGSTOP
);
3997 send_sigstop_callback (thread_info
*thread
, void *except
)
3999 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4001 /* Ignore EXCEPT. */
4012 /* Increment the suspend count of an LWP, and stop it, if not stopped
4015 suspend_and_send_sigstop_callback (thread_info
*thread
, void *except
)
4017 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4019 /* Ignore EXCEPT. */
4023 lwp_suspended_inc (lwp
);
4025 return send_sigstop_callback (thread
, except
);
4029 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
4031 /* Store the exit status for later. */
4032 lwp
->status_pending_p
= 1;
4033 lwp
->status_pending
= wstat
;
4035 /* Store in waitstatus as well, as there's nothing else to process
4037 if (WIFEXITED (wstat
))
4039 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
4040 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
4042 else if (WIFSIGNALED (wstat
))
4044 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
4045 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
4048 /* Prevent trying to stop it. */
4051 /* No further stops are expected from a dead lwp. */
4052 lwp
->stop_expected
= 0;
4055 /* Return true if LWP has exited already, and has a pending exit event
4056 to report to GDB. */
4059 lwp_is_marked_dead (struct lwp_info
*lwp
)
4061 return (lwp
->status_pending_p
4062 && (WIFEXITED (lwp
->status_pending
)
4063 || WIFSIGNALED (lwp
->status_pending
)));
4066 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4069 wait_for_sigstop (void)
4071 struct thread_info
*saved_thread
;
4076 saved_thread
= current_thread
;
4077 if (saved_thread
!= NULL
)
4078 saved_tid
= saved_thread
->id
;
4080 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4083 debug_printf ("wait_for_sigstop: pulling events\n");
4085 /* Passing NULL_PTID as filter indicates we want all events to be
4086 left pending. Eventually this returns when there are no
4087 unwaited-for children left. */
4088 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4090 gdb_assert (ret
== -1);
4092 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4093 current_thread
= saved_thread
;
4097 debug_printf ("Previously current thread died.\n");
4099 /* We can't change the current inferior behind GDB's back,
4100 otherwise, a subsequent command may apply to the wrong
4102 current_thread
= NULL
;
4106 /* Returns true if THREAD is stopped in a jump pad, and we can't
4107 move it out, because we need to report the stop event to GDB. For
4108 example, if the user puts a breakpoint in the jump pad, it's
4109 because she wants to debug it. */
4112 stuck_in_jump_pad_callback (thread_info
*thread
)
4114 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4116 if (lwp
->suspended
!= 0)
4118 internal_error (__FILE__
, __LINE__
,
4119 "LWP %ld is suspended, suspended=%d\n",
4120 lwpid_of (thread
), lwp
->suspended
);
4122 gdb_assert (lwp
->stopped
);
4124 /* Allow debugging the jump pad, gdb_collect, etc.. */
4125 return (supports_fast_tracepoints ()
4126 && agent_loaded_p ()
4127 && (gdb_breakpoint_here (lwp
->stop_pc
)
4128 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4129 || thread
->last_resume_kind
== resume_step
)
4130 && (linux_fast_tracepoint_collecting (lwp
, NULL
)
4131 != fast_tpoint_collect_result::not_collecting
));
4135 move_out_of_jump_pad_callback (thread_info
*thread
)
4137 struct thread_info
*saved_thread
;
4138 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4141 if (lwp
->suspended
!= 0)
4143 internal_error (__FILE__
, __LINE__
,
4144 "LWP %ld is suspended, suspended=%d\n",
4145 lwpid_of (thread
), lwp
->suspended
);
4147 gdb_assert (lwp
->stopped
);
4149 /* For gdb_breakpoint_here. */
4150 saved_thread
= current_thread
;
4151 current_thread
= thread
;
4153 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4155 /* Allow debugging the jump pad, gdb_collect, etc. */
4156 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4157 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4158 && thread
->last_resume_kind
!= resume_step
4159 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4162 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4167 lwp
->status_pending_p
= 0;
4168 enqueue_one_deferred_signal (lwp
, wstat
);
4171 debug_printf ("Signal %d for LWP %ld deferred "
4173 WSTOPSIG (*wstat
), lwpid_of (thread
));
4176 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4179 lwp_suspended_inc (lwp
);
4181 current_thread
= saved_thread
;
4185 lwp_running (thread_info
*thread
, void *data
)
4187 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4189 if (lwp_is_marked_dead (lwp
))
4196 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4197 If SUSPEND, then also increase the suspend count of every LWP,
4201 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4203 /* Should not be called recursively. */
4204 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4209 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4210 suspend
? "stop-and-suspend" : "stop",
4212 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4216 stopping_threads
= (suspend
4217 ? STOPPING_AND_SUSPENDING_THREADS
4218 : STOPPING_THREADS
);
4221 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
4223 find_inferior (&all_threads
, send_sigstop_callback
, except
);
4224 wait_for_sigstop ();
4225 stopping_threads
= NOT_STOPPING_THREADS
;
4229 debug_printf ("stop_all_lwps done, setting stopping_threads "
4230 "back to !stopping\n");
4235 /* Enqueue one signal in the chain of signals which need to be
4236 delivered to this process on next resume. */
4239 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4241 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4243 p_sig
->prev
= lwp
->pending_signals
;
4244 p_sig
->signal
= signal
;
4246 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4248 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4249 lwp
->pending_signals
= p_sig
;
4252 /* Install breakpoints for software single stepping. */
4255 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4257 struct thread_info
*thread
= get_lwp_thread (lwp
);
4258 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4259 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
4261 current_thread
= thread
;
4262 std::vector
<CORE_ADDR
> next_pcs
= the_low_target
.get_next_pcs (regcache
);
4264 for (CORE_ADDR pc
: next_pcs
)
4265 set_single_step_breakpoint (pc
, current_ptid
);
4267 do_cleanups (old_chain
);
4270 /* Single step via hardware or software single step.
4271 Return 1 if hardware single stepping, 0 if software single stepping
4272 or can't single step. */
4275 single_step (struct lwp_info
* lwp
)
4279 if (can_hardware_single_step ())
4283 else if (can_software_single_step ())
4285 install_software_single_step_breakpoints (lwp
);
4291 debug_printf ("stepping is not implemented on this target");
4297 /* The signal can be delivered to the inferior if we are not trying to
4298 finish a fast tracepoint collect. Since signal can be delivered in
4299 the step-over, the program may go to signal handler and trap again
4300 after return from the signal handler. We can live with the spurious
4304 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4306 return (lwp
->collecting_fast_tracepoint
4307 == fast_tpoint_collect_result::not_collecting
);
4310 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4311 SIGNAL is nonzero, give it that signal. */
4314 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4315 int step
, int signal
, siginfo_t
*info
)
4317 struct thread_info
*thread
= get_lwp_thread (lwp
);
4318 struct thread_info
*saved_thread
;
4320 struct process_info
*proc
= get_thread_process (thread
);
4322 /* Note that target description may not be initialised
4323 (proc->tdesc == NULL) at this point because the program hasn't
4324 stopped at the first instruction yet. It means GDBserver skips
4325 the extra traps from the wrapper program (see option --wrapper).
4326 Code in this function that requires register access should be
4327 guarded by proc->tdesc == NULL or something else. */
4329 if (lwp
->stopped
== 0)
4332 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4334 fast_tpoint_collect_result fast_tp_collecting
4335 = lwp
->collecting_fast_tracepoint
;
4337 gdb_assert (!stabilizing_threads
4338 || (fast_tp_collecting
4339 != fast_tpoint_collect_result::not_collecting
));
4341 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4342 user used the "jump" command, or "set $pc = foo"). */
4343 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4345 /* Collecting 'while-stepping' actions doesn't make sense
4347 release_while_stepping_state_list (thread
);
4350 /* If we have pending signals or status, and a new signal, enqueue the
4351 signal. Also enqueue the signal if it can't be delivered to the
4352 inferior right now. */
4354 && (lwp
->status_pending_p
4355 || lwp
->pending_signals
!= NULL
4356 || !lwp_signal_can_be_delivered (lwp
)))
4358 enqueue_pending_signal (lwp
, signal
, info
);
4360 /* Postpone any pending signal. It was enqueued above. */
4364 if (lwp
->status_pending_p
)
4367 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4368 " has pending status\n",
4369 lwpid_of (thread
), step
? "step" : "continue",
4370 lwp
->stop_expected
? "expected" : "not expected");
4374 saved_thread
= current_thread
;
4375 current_thread
= thread
;
4377 /* This bit needs some thinking about. If we get a signal that
4378 we must report while a single-step reinsert is still pending,
4379 we often end up resuming the thread. It might be better to
4380 (ew) allow a stack of pending events; then we could be sure that
4381 the reinsert happened right away and not lose any signals.
4383 Making this stack would also shrink the window in which breakpoints are
4384 uninserted (see comment in linux_wait_for_lwp) but not enough for
4385 complete correctness, so it won't solve that problem. It may be
4386 worthwhile just to solve this one, however. */
4387 if (lwp
->bp_reinsert
!= 0)
4390 debug_printf (" pending reinsert at 0x%s\n",
4391 paddress (lwp
->bp_reinsert
));
4393 if (can_hardware_single_step ())
4395 if (fast_tp_collecting
== fast_tpoint_collect_result::not_collecting
)
4398 warning ("BAD - reinserting but not stepping.");
4400 warning ("BAD - reinserting and suspended(%d).",
4405 step
= maybe_hw_step (thread
);
4408 if (fast_tp_collecting
== fast_tpoint_collect_result::before_insn
)
4411 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4412 " (exit-jump-pad-bkpt)\n",
4415 else if (fast_tp_collecting
== fast_tpoint_collect_result::at_insn
)
4418 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4419 " single-stepping\n",
4422 if (can_hardware_single_step ())
4426 internal_error (__FILE__
, __LINE__
,
4427 "moving out of jump pad single-stepping"
4428 " not implemented on this target");
4432 /* If we have while-stepping actions in this thread set it stepping.
4433 If we have a signal to deliver, it may or may not be set to
4434 SIG_IGN, we don't know. Assume so, and allow collecting
4435 while-stepping into a signal handler. A possible smart thing to
4436 do would be to set an internal breakpoint at the signal return
4437 address, continue, and carry on catching this while-stepping
4438 action only when that breakpoint is hit. A future
4440 if (thread
->while_stepping
!= NULL
)
4443 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4446 step
= single_step (lwp
);
4449 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4451 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4453 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4457 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4458 (long) lwp
->stop_pc
);
4462 /* If we have pending signals, consume one if it can be delivered to
4464 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4466 struct pending_signals
**p_sig
;
4468 p_sig
= &lwp
->pending_signals
;
4469 while ((*p_sig
)->prev
!= NULL
)
4470 p_sig
= &(*p_sig
)->prev
;
4472 signal
= (*p_sig
)->signal
;
4473 if ((*p_sig
)->info
.si_signo
!= 0)
4474 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4482 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4483 lwpid_of (thread
), step
? "step" : "continue", signal
,
4484 lwp
->stop_expected
? "expected" : "not expected");
4486 if (the_low_target
.prepare_to_resume
!= NULL
)
4487 the_low_target
.prepare_to_resume (lwp
);
4489 regcache_invalidate_thread (thread
);
4491 lwp
->stepping
= step
;
4493 ptrace_request
= PTRACE_SINGLESTEP
;
4494 else if (gdb_catching_syscalls_p (lwp
))
4495 ptrace_request
= PTRACE_SYSCALL
;
4497 ptrace_request
= PTRACE_CONT
;
4498 ptrace (ptrace_request
,
4500 (PTRACE_TYPE_ARG3
) 0,
4501 /* Coerce to a uintptr_t first to avoid potential gcc warning
4502 of coercing an 8 byte integer to a 4 byte pointer. */
4503 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4505 current_thread
= saved_thread
;
4507 perror_with_name ("resuming thread");
4509 /* Successfully resumed. Clear state that no longer makes sense,
4510 and mark the LWP as running. Must not do this before resuming
4511 otherwise if that fails other code will be confused. E.g., we'd
4512 later try to stop the LWP and hang forever waiting for a stop
4513 status. Note that we must not throw after this is cleared,
4514 otherwise handle_zombie_lwp_error would get confused. */
4516 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4519 /* Called when we try to resume a stopped LWP and that errors out. If
4520 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4521 or about to become), discard the error, clear any pending status
4522 the LWP may have, and return true (we'll collect the exit status
4523 soon enough). Otherwise, return false. */
4526 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4528 struct thread_info
*thread
= get_lwp_thread (lp
);
4530 /* If we get an error after resuming the LWP successfully, we'd
4531 confuse !T state for the LWP being gone. */
4532 gdb_assert (lp
->stopped
);
4534 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4535 because even if ptrace failed with ESRCH, the tracee may be "not
4536 yet fully dead", but already refusing ptrace requests. In that
4537 case the tracee has 'R (Running)' state for a little bit
4538 (observed in Linux 3.18). See also the note on ESRCH in the
4539 ptrace(2) man page. Instead, check whether the LWP has any state
4540 other than ptrace-stopped. */
4542 /* Don't assume anything if /proc/PID/status can't be read. */
4543 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4545 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4546 lp
->status_pending_p
= 0;
4552 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4553 disappears while we try to resume it. */
4556 linux_resume_one_lwp (struct lwp_info
*lwp
,
4557 int step
, int signal
, siginfo_t
*info
)
4561 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4563 CATCH (ex
, RETURN_MASK_ERROR
)
4565 if (!check_ptrace_stopped_lwp_gone (lwp
))
4566 throw_exception (ex
);
4571 /* This function is called once per thread via for_each_thread.
4572 We look up which resume request applies to THREAD and mark it with a
4573 pointer to the appropriate resume request.
4575 This algorithm is O(threads * resume elements), but resume elements
4576 is small (and will remain small at least until GDB supports thread
4580 linux_set_resume_request (thread_info
*thread
, thread_resume
*resume
, size_t n
)
4582 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4584 for (int ndx
= 0; ndx
< n
; ndx
++)
4586 ptid_t ptid
= resume
[ndx
].thread
;
4587 if (ptid_equal (ptid
, minus_one_ptid
)
4588 || ptid
== thread
->id
4589 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4591 || (ptid_get_pid (ptid
) == pid_of (thread
)
4592 && (ptid_is_pid (ptid
)
4593 || ptid_get_lwp (ptid
) == -1)))
4595 if (resume
[ndx
].kind
== resume_stop
4596 && thread
->last_resume_kind
== resume_stop
)
4599 debug_printf ("already %s LWP %ld at GDB's request\n",
4600 (thread
->last_status
.kind
4601 == TARGET_WAITKIND_STOPPED
)
4609 /* Ignore (wildcard) resume requests for already-resumed
4611 if (resume
[ndx
].kind
!= resume_stop
4612 && thread
->last_resume_kind
!= resume_stop
)
4615 debug_printf ("already %s LWP %ld at GDB's request\n",
4616 (thread
->last_resume_kind
4624 /* Don't let wildcard resumes resume fork children that GDB
4625 does not yet know are new fork children. */
4626 if (lwp
->fork_relative
!= NULL
)
4628 struct lwp_info
*rel
= lwp
->fork_relative
;
4630 if (rel
->status_pending_p
4631 && (rel
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
4632 || rel
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
))
4635 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4641 /* If the thread has a pending event that has already been
4642 reported to GDBserver core, but GDB has not pulled the
4643 event out of the vStopped queue yet, likewise, ignore the
4644 (wildcard) resume request. */
4645 if (in_queued_stop_replies (thread
->id
))
4648 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4653 lwp
->resume
= &resume
[ndx
];
4654 thread
->last_resume_kind
= lwp
->resume
->kind
;
4656 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4657 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4659 /* If we had a deferred signal to report, dequeue one now.
4660 This can happen if LWP gets more than one signal while
4661 trying to get out of a jump pad. */
4663 && !lwp
->status_pending_p
4664 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4666 lwp
->status_pending_p
= 1;
4669 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4670 "leaving status pending.\n",
4671 WSTOPSIG (lwp
->status_pending
),
4679 /* No resume action for this thread. */
4683 /* find_inferior callback for linux_resume.
4684 Set *FLAG_P if this lwp has an interesting status pending. */
4687 resume_status_pending_p (thread_info
*thread
)
4689 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4691 /* LWPs which will not be resumed are not interesting, because
4692 we might not wait for them next time through linux_wait. */
4693 if (lwp
->resume
== NULL
)
4696 return thread_still_has_status_pending_p (thread
);
4699 /* Return 1 if this lwp that GDB wants running is stopped at an
4700 internal breakpoint that we need to step over. It assumes that any
4701 required STOP_PC adjustment has already been propagated to the
4702 inferior's regcache. */
4705 need_step_over_p (thread_info
*thread
)
4707 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4708 struct thread_info
*saved_thread
;
4710 struct process_info
*proc
= get_thread_process (thread
);
4712 /* GDBserver is skipping the extra traps from the wrapper program,
4713 don't have to do step over. */
4714 if (proc
->tdesc
== NULL
)
4717 /* LWPs which will not be resumed are not interesting, because we
4718 might not wait for them next time through linux_wait. */
4723 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4728 if (thread
->last_resume_kind
== resume_stop
)
4731 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4737 gdb_assert (lwp
->suspended
>= 0);
4742 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4747 if (lwp
->status_pending_p
)
4750 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4756 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4760 /* If the PC has changed since we stopped, then don't do anything,
4761 and let the breakpoint/tracepoint be hit. This happens if, for
4762 instance, GDB handled the decr_pc_after_break subtraction itself,
4763 GDB is OOL stepping this thread, or the user has issued a "jump"
4764 command, or poked thread's registers herself. */
4765 if (pc
!= lwp
->stop_pc
)
4768 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4769 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4771 paddress (lwp
->stop_pc
), paddress (pc
));
4775 /* On software single step target, resume the inferior with signal
4776 rather than stepping over. */
4777 if (can_software_single_step ()
4778 && lwp
->pending_signals
!= NULL
4779 && lwp_signal_can_be_delivered (lwp
))
4782 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4789 saved_thread
= current_thread
;
4790 current_thread
= thread
;
4792 /* We can only step over breakpoints we know about. */
4793 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4795 /* Don't step over a breakpoint that GDB expects to hit
4796 though. If the condition is being evaluated on the target's side
4797 and it evaluate to false, step over this breakpoint as well. */
4798 if (gdb_breakpoint_here (pc
)
4799 && gdb_condition_true_at_breakpoint (pc
)
4800 && gdb_no_commands_at_breakpoint (pc
))
4803 debug_printf ("Need step over [LWP %ld]? yes, but found"
4804 " GDB breakpoint at 0x%s; skipping step over\n",
4805 lwpid_of (thread
), paddress (pc
));
4807 current_thread
= saved_thread
;
4813 debug_printf ("Need step over [LWP %ld]? yes, "
4814 "found breakpoint at 0x%s\n",
4815 lwpid_of (thread
), paddress (pc
));
4817 /* We've found an lwp that needs stepping over --- return 1 so
4818 that find_inferior stops looking. */
4819 current_thread
= saved_thread
;
4825 current_thread
= saved_thread
;
4828 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4830 lwpid_of (thread
), paddress (pc
));
4835 /* Start a step-over operation on LWP. When LWP stopped at a
4836 breakpoint, to make progress, we need to remove the breakpoint out
4837 of the way. If we let other threads run while we do that, they may
4838 pass by the breakpoint location and miss hitting it. To avoid
4839 that, a step-over momentarily stops all threads while LWP is
4840 single-stepped by either hardware or software while the breakpoint
4841 is temporarily uninserted from the inferior. When the single-step
4842 finishes, we reinsert the breakpoint, and let all threads that are
4843 supposed to be running, run again. */
4846 start_step_over (struct lwp_info
*lwp
)
4848 struct thread_info
*thread
= get_lwp_thread (lwp
);
4849 struct thread_info
*saved_thread
;
4854 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4857 stop_all_lwps (1, lwp
);
4859 if (lwp
->suspended
!= 0)
4861 internal_error (__FILE__
, __LINE__
,
4862 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4867 debug_printf ("Done stopping all threads for step-over.\n");
4869 /* Note, we should always reach here with an already adjusted PC,
4870 either by GDB (if we're resuming due to GDB's request), or by our
4871 caller, if we just finished handling an internal breakpoint GDB
4872 shouldn't care about. */
4875 saved_thread
= current_thread
;
4876 current_thread
= thread
;
4878 lwp
->bp_reinsert
= pc
;
4879 uninsert_breakpoints_at (pc
);
4880 uninsert_fast_tracepoint_jumps_at (pc
);
4882 step
= single_step (lwp
);
4884 current_thread
= saved_thread
;
4886 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4888 /* Require next event from this LWP. */
4889 step_over_bkpt
= thread
->id
;
4893 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4894 start_step_over, if still there, and delete any single-step
4895 breakpoints we've set, on non hardware single-step targets. */
4898 finish_step_over (struct lwp_info
*lwp
)
4900 if (lwp
->bp_reinsert
!= 0)
4902 struct thread_info
*saved_thread
= current_thread
;
4905 debug_printf ("Finished step over.\n");
4907 current_thread
= get_lwp_thread (lwp
);
4909 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4910 may be no breakpoint to reinsert there by now. */
4911 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4912 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4914 lwp
->bp_reinsert
= 0;
4916 /* Delete any single-step breakpoints. No longer needed. We
4917 don't have to worry about other threads hitting this trap,
4918 and later not being able to explain it, because we were
4919 stepping over a breakpoint, and we hold all threads but
4920 LWP stopped while doing that. */
4921 if (!can_hardware_single_step ())
4923 gdb_assert (has_single_step_breakpoints (current_thread
));
4924 delete_single_step_breakpoints (current_thread
);
4927 step_over_bkpt
= null_ptid
;
4928 current_thread
= saved_thread
;
4935 /* If there's a step over in progress, wait until all threads stop
4936 (that is, until the stepping thread finishes its step), and
4937 unsuspend all lwps. The stepping thread ends with its status
4938 pending, which is processed later when we get back to processing
4942 complete_ongoing_step_over (void)
4944 if (!ptid_equal (step_over_bkpt
, null_ptid
))
4946 struct lwp_info
*lwp
;
4951 debug_printf ("detach: step over in progress, finish it first\n");
4953 /* Passing NULL_PTID as filter indicates we want all events to
4954 be left pending. Eventually this returns when there are no
4955 unwaited-for children left. */
4956 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4958 gdb_assert (ret
== -1);
4960 lwp
= find_lwp_pid (step_over_bkpt
);
4962 finish_step_over (lwp
);
4963 step_over_bkpt
= null_ptid
;
4964 unsuspend_all_lwps (lwp
);
4968 /* This function is called once per thread. We check the thread's resume
4969 request, which will tell us whether to resume, step, or leave the thread
4970 stopped; and what signal, if any, it should be sent.
4972 For threads which we aren't explicitly told otherwise, we preserve
4973 the stepping flag; this is used for stepping over gdbserver-placed
4976 If pending_flags was set in any thread, we queue any needed
4977 signals, since we won't actually resume. We already have a pending
4978 event to report, so we don't need to preserve any step requests;
4979 they should be re-issued if necessary. */
4982 linux_resume_one_thread (thread_info
*thread
, void *arg
)
4984 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4985 int leave_all_stopped
= * (int *) arg
;
4988 if (lwp
->resume
== NULL
)
4991 if (lwp
->resume
->kind
== resume_stop
)
4994 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4999 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
5001 /* Stop the thread, and wait for the event asynchronously,
5002 through the event loop. */
5008 debug_printf ("already stopped LWP %ld\n",
5011 /* The LWP may have been stopped in an internal event that
5012 was not meant to be notified back to GDB (e.g., gdbserver
5013 breakpoint), so we should be reporting a stop event in
5016 /* If the thread already has a pending SIGSTOP, this is a
5017 no-op. Otherwise, something later will presumably resume
5018 the thread and this will cause it to cancel any pending
5019 operation, due to last_resume_kind == resume_stop. If
5020 the thread already has a pending status to report, we
5021 will still report it the next time we wait - see
5022 status_pending_p_callback. */
5024 /* If we already have a pending signal to report, then
5025 there's no need to queue a SIGSTOP, as this means we're
5026 midway through moving the LWP out of the jumppad, and we
5027 will report the pending signal as soon as that is
5029 if (lwp
->pending_signals_to_report
== NULL
)
5033 /* For stop requests, we're done. */
5035 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5039 /* If this thread which is about to be resumed has a pending status,
5040 then don't resume it - we can just report the pending status.
5041 Likewise if it is suspended, because e.g., another thread is
5042 stepping past a breakpoint. Make sure to queue any signals that
5043 would otherwise be sent. In all-stop mode, we do this decision
5044 based on if *any* thread has a pending status. If there's a
5045 thread that needs the step-over-breakpoint dance, then don't
5046 resume any other thread but that particular one. */
5047 leave_pending
= (lwp
->suspended
5048 || lwp
->status_pending_p
5049 || leave_all_stopped
);
5051 /* If we have a new signal, enqueue the signal. */
5052 if (lwp
->resume
->sig
!= 0)
5054 siginfo_t info
, *info_p
;
5056 /* If this is the same signal we were previously stopped by,
5057 make sure to queue its siginfo. */
5058 if (WIFSTOPPED (lwp
->last_status
)
5059 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
5060 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
5061 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
5066 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
5072 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
5074 proceed_one_lwp (thread
, NULL
);
5079 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5082 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5088 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5090 struct thread_info
*need_step_over
= NULL
;
5091 int leave_all_stopped
;
5096 debug_printf ("linux_resume:\n");
5099 for_each_thread ([&] (thread_info
*thread
)
5101 linux_set_resume_request (thread
, resume_info
, n
);
5104 /* If there is a thread which would otherwise be resumed, which has
5105 a pending status, then don't resume any threads - we can just
5106 report the pending status. Make sure to queue any signals that
5107 would otherwise be sent. In non-stop mode, we'll apply this
5108 logic to each thread individually. We consume all pending events
5109 before considering to start a step-over (in all-stop). */
5110 bool any_pending
= false;
5112 any_pending
= find_thread (resume_status_pending_p
) != NULL
;
5114 /* If there is a thread which would otherwise be resumed, which is
5115 stopped at a breakpoint that needs stepping over, then don't
5116 resume any threads - have it step over the breakpoint with all
5117 other threads stopped, then resume all threads again. Make sure
5118 to queue any signals that would otherwise be delivered or
5120 if (!any_pending
&& supports_breakpoints ())
5121 need_step_over
= find_thread (need_step_over_p
);
5123 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5127 if (need_step_over
!= NULL
)
5128 debug_printf ("Not resuming all, need step over\n");
5129 else if (any_pending
)
5130 debug_printf ("Not resuming, all-stop and found "
5131 "an LWP with pending status\n");
5133 debug_printf ("Resuming, no pending status or step over needed\n");
5136 /* Even if we're leaving threads stopped, queue all signals we'd
5137 otherwise deliver. */
5138 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
5141 start_step_over (get_thread_lwp (need_step_over
));
5145 debug_printf ("linux_resume done\n");
5149 /* We may have events that were pending that can/should be sent to
5150 the client now. Trigger a linux_wait call. */
5151 if (target_is_async_p ())
5155 /* This function is called once per thread. We check the thread's
5156 last resume request, which will tell us whether to resume, step, or
5157 leave the thread stopped. Any signal the client requested to be
5158 delivered has already been enqueued at this point.
5160 If any thread that GDB wants running is stopped at an internal
5161 breakpoint that needs stepping over, we start a step-over operation
5162 on that particular thread, and leave all others stopped. */
5165 proceed_one_lwp (thread_info
*thread
, void *except
)
5167 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5174 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5179 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5183 if (thread
->last_resume_kind
== resume_stop
5184 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5187 debug_printf (" client wants LWP to remain %ld stopped\n",
5192 if (lwp
->status_pending_p
)
5195 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5200 gdb_assert (lwp
->suspended
>= 0);
5205 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5209 if (thread
->last_resume_kind
== resume_stop
5210 && lwp
->pending_signals_to_report
== NULL
5211 && (lwp
->collecting_fast_tracepoint
5212 == fast_tpoint_collect_result::not_collecting
))
5214 /* We haven't reported this LWP as stopped yet (otherwise, the
5215 last_status.kind check above would catch it, and we wouldn't
5216 reach here. This LWP may have been momentarily paused by a
5217 stop_all_lwps call while handling for example, another LWP's
5218 step-over. In that case, the pending expected SIGSTOP signal
5219 that was queued at vCont;t handling time will have already
5220 been consumed by wait_for_sigstop, and so we need to requeue
5221 another one here. Note that if the LWP already has a SIGSTOP
5222 pending, this is a no-op. */
5225 debug_printf ("Client wants LWP %ld to stop. "
5226 "Making sure it has a SIGSTOP pending\n",
5232 if (thread
->last_resume_kind
== resume_step
)
5235 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5238 /* If resume_step is requested by GDB, install single-step
5239 breakpoints when the thread is about to be actually resumed if
5240 the single-step breakpoints weren't removed. */
5241 if (can_software_single_step ()
5242 && !has_single_step_breakpoints (thread
))
5243 install_software_single_step_breakpoints (lwp
);
5245 step
= maybe_hw_step (thread
);
5247 else if (lwp
->bp_reinsert
!= 0)
5250 debug_printf (" stepping LWP %ld, reinsert set\n",
5253 step
= maybe_hw_step (thread
);
5258 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5263 unsuspend_and_proceed_one_lwp (thread_info
*thread
, void *except
)
5265 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5270 lwp_suspended_decr (lwp
);
5272 return proceed_one_lwp (thread
, except
);
5275 /* When we finish a step-over, set threads running again. If there's
5276 another thread that may need a step-over, now's the time to start
5277 it. Eventually, we'll move all threads past their breakpoints. */
5280 proceed_all_lwps (void)
5282 struct thread_info
*need_step_over
;
5284 /* If there is a thread which would otherwise be resumed, which is
5285 stopped at a breakpoint that needs stepping over, then don't
5286 resume any threads - have it step over the breakpoint with all
5287 other threads stopped, then resume all threads again. */
5289 if (supports_breakpoints ())
5291 need_step_over
= find_thread (need_step_over_p
);
5293 if (need_step_over
!= NULL
)
5296 debug_printf ("proceed_all_lwps: found "
5297 "thread %ld needing a step-over\n",
5298 lwpid_of (need_step_over
));
5300 start_step_over (get_thread_lwp (need_step_over
));
5306 debug_printf ("Proceeding, no step-over needed\n");
5308 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
5311 /* Stopped LWPs that the client wanted to be running, that don't have
5312 pending statuses, are set to run again, except for EXCEPT, if not
5313 NULL. This undoes a stop_all_lwps call. */
5316 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5322 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5323 lwpid_of (get_lwp_thread (except
)));
5325 debug_printf ("unstopping all lwps\n");
5329 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
5331 find_inferior (&all_threads
, proceed_one_lwp
, except
);
5335 debug_printf ("unstop_all_lwps done\n");
5341 #ifdef HAVE_LINUX_REGSETS
5343 #define use_linux_regsets 1
5345 /* Returns true if REGSET has been disabled. */
5348 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5350 return (info
->disabled_regsets
!= NULL
5351 && info
->disabled_regsets
[regset
- info
->regsets
]);
5354 /* Disable REGSET. */
5357 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5361 dr_offset
= regset
- info
->regsets
;
5362 if (info
->disabled_regsets
== NULL
)
5363 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5364 info
->disabled_regsets
[dr_offset
] = 1;
5368 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5369 struct regcache
*regcache
)
5371 struct regset_info
*regset
;
5372 int saw_general_regs
= 0;
5376 pid
= lwpid_of (current_thread
);
5377 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5382 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5385 buf
= xmalloc (regset
->size
);
5387 nt_type
= regset
->nt_type
;
5391 iov
.iov_len
= regset
->size
;
5392 data
= (void *) &iov
;
5398 res
= ptrace (regset
->get_request
, pid
,
5399 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5401 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5407 /* If we get EIO on a regset, do not try it again for
5408 this process mode. */
5409 disable_regset (regsets_info
, regset
);
5411 else if (errno
== ENODATA
)
5413 /* ENODATA may be returned if the regset is currently
5414 not "active". This can happen in normal operation,
5415 so suppress the warning in this case. */
5417 else if (errno
== ESRCH
)
5419 /* At this point, ESRCH should mean the process is
5420 already gone, in which case we simply ignore attempts
5421 to read its registers. */
5426 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5433 if (regset
->type
== GENERAL_REGS
)
5434 saw_general_regs
= 1;
5435 regset
->store_function (regcache
, buf
);
5439 if (saw_general_regs
)
5446 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5447 struct regcache
*regcache
)
5449 struct regset_info
*regset
;
5450 int saw_general_regs
= 0;
5454 pid
= lwpid_of (current_thread
);
5455 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5460 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5461 || regset
->fill_function
== NULL
)
5464 buf
= xmalloc (regset
->size
);
5466 /* First fill the buffer with the current register set contents,
5467 in case there are any items in the kernel's regset that are
5468 not in gdbserver's regcache. */
5470 nt_type
= regset
->nt_type
;
5474 iov
.iov_len
= regset
->size
;
5475 data
= (void *) &iov
;
5481 res
= ptrace (regset
->get_request
, pid
,
5482 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5484 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5489 /* Then overlay our cached registers on that. */
5490 regset
->fill_function (regcache
, buf
);
5492 /* Only now do we write the register set. */
5494 res
= ptrace (regset
->set_request
, pid
,
5495 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5497 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5505 /* If we get EIO on a regset, do not try it again for
5506 this process mode. */
5507 disable_regset (regsets_info
, regset
);
5509 else if (errno
== ESRCH
)
5511 /* At this point, ESRCH should mean the process is
5512 already gone, in which case we simply ignore attempts
5513 to change its registers. See also the related
5514 comment in linux_resume_one_lwp. */
5520 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5523 else if (regset
->type
== GENERAL_REGS
)
5524 saw_general_regs
= 1;
5527 if (saw_general_regs
)
5533 #else /* !HAVE_LINUX_REGSETS */
5535 #define use_linux_regsets 0
5536 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5537 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5541 /* Return 1 if register REGNO is supported by one of the regset ptrace
5542 calls or 0 if it has to be transferred individually. */
5545 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5547 unsigned char mask
= 1 << (regno
% 8);
5548 size_t index
= regno
/ 8;
5550 return (use_linux_regsets
5551 && (regs_info
->regset_bitmap
== NULL
5552 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5555 #ifdef HAVE_LINUX_USRREGS
5558 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5562 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5563 error ("Invalid register number %d.", regnum
);
5565 addr
= usrregs
->regmap
[regnum
];
5570 /* Fetch one register. */
5572 fetch_register (const struct usrregs_info
*usrregs
,
5573 struct regcache
*regcache
, int regno
)
5580 if (regno
>= usrregs
->num_regs
)
5582 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5585 regaddr
= register_addr (usrregs
, regno
);
5589 size
= ((register_size (regcache
->tdesc
, regno
)
5590 + sizeof (PTRACE_XFER_TYPE
) - 1)
5591 & -sizeof (PTRACE_XFER_TYPE
));
5592 buf
= (char *) alloca (size
);
5594 pid
= lwpid_of (current_thread
);
5595 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5598 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5599 ptrace (PTRACE_PEEKUSER
, pid
,
5600 /* Coerce to a uintptr_t first to avoid potential gcc warning
5601 of coercing an 8 byte integer to a 4 byte pointer. */
5602 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5603 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5605 error ("reading register %d: %s", regno
, strerror (errno
));
5608 if (the_low_target
.supply_ptrace_register
)
5609 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5611 supply_register (regcache
, regno
, buf
);
5614 /* Store one register. */
5616 store_register (const struct usrregs_info
*usrregs
,
5617 struct regcache
*regcache
, int regno
)
5624 if (regno
>= usrregs
->num_regs
)
5626 if ((*the_low_target
.cannot_store_register
) (regno
))
5629 regaddr
= register_addr (usrregs
, regno
);
5633 size
= ((register_size (regcache
->tdesc
, regno
)
5634 + sizeof (PTRACE_XFER_TYPE
) - 1)
5635 & -sizeof (PTRACE_XFER_TYPE
));
5636 buf
= (char *) alloca (size
);
5637 memset (buf
, 0, size
);
5639 if (the_low_target
.collect_ptrace_register
)
5640 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5642 collect_register (regcache
, regno
, buf
);
5644 pid
= lwpid_of (current_thread
);
5645 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5648 ptrace (PTRACE_POKEUSER
, pid
,
5649 /* Coerce to a uintptr_t first to avoid potential gcc warning
5650 about coercing an 8 byte integer to a 4 byte pointer. */
5651 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5652 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5655 /* At this point, ESRCH should mean the process is
5656 already gone, in which case we simply ignore attempts
5657 to change its registers. See also the related
5658 comment in linux_resume_one_lwp. */
5662 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5663 error ("writing register %d: %s", regno
, strerror (errno
));
5665 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5669 /* Fetch all registers, or just one, from the child process.
5670 If REGNO is -1, do this for all registers, skipping any that are
5671 assumed to have been retrieved by regsets_fetch_inferior_registers,
5672 unless ALL is non-zero.
5673 Otherwise, REGNO specifies which register (so we can save time). */
5675 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5676 struct regcache
*regcache
, int regno
, int all
)
5678 struct usrregs_info
*usr
= regs_info
->usrregs
;
5682 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5683 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5684 fetch_register (usr
, regcache
, regno
);
5687 fetch_register (usr
, regcache
, regno
);
5690 /* Store our register values back into the inferior.
5691 If REGNO is -1, do this for all registers, skipping any that are
5692 assumed to have been saved by regsets_store_inferior_registers,
5693 unless ALL is non-zero.
5694 Otherwise, REGNO specifies which register (so we can save time). */
5696 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5697 struct regcache
*regcache
, int regno
, int all
)
5699 struct usrregs_info
*usr
= regs_info
->usrregs
;
5703 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5704 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5705 store_register (usr
, regcache
, regno
);
5708 store_register (usr
, regcache
, regno
);
5711 #else /* !HAVE_LINUX_USRREGS */
5713 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5714 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5720 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5724 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5728 if (the_low_target
.fetch_register
!= NULL
5729 && regs_info
->usrregs
!= NULL
)
5730 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5731 (*the_low_target
.fetch_register
) (regcache
, regno
);
5733 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5734 if (regs_info
->usrregs
!= NULL
)
5735 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5739 if (the_low_target
.fetch_register
!= NULL
5740 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5743 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5745 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5747 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5748 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5753 linux_store_registers (struct regcache
*regcache
, int regno
)
5757 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5761 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5763 if (regs_info
->usrregs
!= NULL
)
5764 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5768 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5770 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5772 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5773 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5778 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5779 to debugger memory starting at MYADDR. */
5782 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5784 int pid
= lwpid_of (current_thread
);
5785 PTRACE_XFER_TYPE
*buffer
;
5793 /* Try using /proc. Don't bother for one word. */
5794 if (len
>= 3 * sizeof (long))
5798 /* We could keep this file open and cache it - possibly one per
5799 thread. That requires some juggling, but is even faster. */
5800 sprintf (filename
, "/proc/%d/mem", pid
);
5801 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5805 /* If pread64 is available, use it. It's faster if the kernel
5806 supports it (only one syscall), and it's 64-bit safe even on
5807 32-bit platforms (for instance, SPARC debugging a SPARC64
5810 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5813 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5814 bytes
= read (fd
, myaddr
, len
);
5821 /* Some data was read, we'll try to get the rest with ptrace. */
5831 /* Round starting address down to longword boundary. */
5832 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5833 /* Round ending address up; get number of longwords that makes. */
5834 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5835 / sizeof (PTRACE_XFER_TYPE
));
5836 /* Allocate buffer of that many longwords. */
5837 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5839 /* Read all the longwords */
5841 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5843 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5844 about coercing an 8 byte integer to a 4 byte pointer. */
5845 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5846 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5847 (PTRACE_TYPE_ARG4
) 0);
5853 /* Copy appropriate bytes out of the buffer. */
5856 i
*= sizeof (PTRACE_XFER_TYPE
);
5857 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5859 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5866 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5867 memory at MEMADDR. On failure (cannot write to the inferior)
5868 returns the value of errno. Always succeeds if LEN is zero. */
5871 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5874 /* Round starting address down to longword boundary. */
5875 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5876 /* Round ending address up; get number of longwords that makes. */
5878 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5879 / sizeof (PTRACE_XFER_TYPE
);
5881 /* Allocate buffer of that many longwords. */
5882 PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5884 int pid
= lwpid_of (current_thread
);
5888 /* Zero length write always succeeds. */
5894 /* Dump up to four bytes. */
5895 char str
[4 * 2 + 1];
5897 int dump
= len
< 4 ? len
: 4;
5899 for (i
= 0; i
< dump
; i
++)
5901 sprintf (p
, "%02x", myaddr
[i
]);
5906 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5907 str
, (long) memaddr
, pid
);
5910 /* Fill start and end extra bytes of buffer with existing memory data. */
5913 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5914 about coercing an 8 byte integer to a 4 byte pointer. */
5915 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5916 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5917 (PTRACE_TYPE_ARG4
) 0);
5925 = ptrace (PTRACE_PEEKTEXT
, pid
,
5926 /* Coerce to a uintptr_t first to avoid potential gcc warning
5927 about coercing an 8 byte integer to a 4 byte pointer. */
5928 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5929 * sizeof (PTRACE_XFER_TYPE
)),
5930 (PTRACE_TYPE_ARG4
) 0);
5935 /* Copy data to be written over corresponding part of buffer. */
5937 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5940 /* Write the entire buffer. */
5942 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5945 ptrace (PTRACE_POKETEXT
, pid
,
5946 /* Coerce to a uintptr_t first to avoid potential gcc warning
5947 about coercing an 8 byte integer to a 4 byte pointer. */
5948 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5949 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5958 linux_look_up_symbols (void)
5960 #ifdef USE_THREAD_DB
5961 struct process_info
*proc
= current_process ();
5963 if (proc
->priv
->thread_db
!= NULL
)
5971 linux_request_interrupt (void)
5973 /* Send a SIGINT to the process group. This acts just like the user
5974 typed a ^C on the controlling terminal. */
5975 kill (-signal_pid
, SIGINT
);
5978 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5979 to debugger memory starting at MYADDR. */
5982 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5984 char filename
[PATH_MAX
];
5986 int pid
= lwpid_of (current_thread
);
5988 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5990 fd
= open (filename
, O_RDONLY
);
5994 if (offset
!= (CORE_ADDR
) 0
5995 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5998 n
= read (fd
, myaddr
, len
);
6005 /* These breakpoint and watchpoint related wrapper functions simply
6006 pass on the function call if the target has registered a
6007 corresponding function. */
6010 linux_supports_z_point_type (char z_type
)
6012 return (the_low_target
.supports_z_point_type
!= NULL
6013 && the_low_target
.supports_z_point_type (z_type
));
6017 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6018 int size
, struct raw_breakpoint
*bp
)
6020 if (type
== raw_bkpt_type_sw
)
6021 return insert_memory_breakpoint (bp
);
6022 else if (the_low_target
.insert_point
!= NULL
)
6023 return the_low_target
.insert_point (type
, addr
, size
, bp
);
6025 /* Unsupported (see target.h). */
6030 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6031 int size
, struct raw_breakpoint
*bp
)
6033 if (type
== raw_bkpt_type_sw
)
6034 return remove_memory_breakpoint (bp
);
6035 else if (the_low_target
.remove_point
!= NULL
)
6036 return the_low_target
.remove_point (type
, addr
, size
, bp
);
6038 /* Unsupported (see target.h). */
6042 /* Implement the to_stopped_by_sw_breakpoint target_ops
6046 linux_stopped_by_sw_breakpoint (void)
6048 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6050 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
6053 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
6057 linux_supports_stopped_by_sw_breakpoint (void)
6059 return USE_SIGTRAP_SIGINFO
;
6062 /* Implement the to_stopped_by_hw_breakpoint target_ops
6066 linux_stopped_by_hw_breakpoint (void)
6068 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6070 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6073 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6077 linux_supports_stopped_by_hw_breakpoint (void)
6079 return USE_SIGTRAP_SIGINFO
;
6082 /* Implement the supports_hardware_single_step target_ops method. */
6085 linux_supports_hardware_single_step (void)
6087 return can_hardware_single_step ();
6091 linux_supports_software_single_step (void)
6093 return can_software_single_step ();
6097 linux_stopped_by_watchpoint (void)
6099 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6101 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6105 linux_stopped_data_address (void)
6107 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6109 return lwp
->stopped_data_address
;
6112 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6113 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6114 && defined(PT_TEXT_END_ADDR)
6116 /* This is only used for targets that define PT_TEXT_ADDR,
6117 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6118 the target has different ways of acquiring this information, like
6121 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6122 to tell gdb about. */
6125 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6127 unsigned long text
, text_end
, data
;
6128 int pid
= lwpid_of (current_thread
);
6132 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6133 (PTRACE_TYPE_ARG4
) 0);
6134 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6135 (PTRACE_TYPE_ARG4
) 0);
6136 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6137 (PTRACE_TYPE_ARG4
) 0);
6141 /* Both text and data offsets produced at compile-time (and so
6142 used by gdb) are relative to the beginning of the program,
6143 with the data segment immediately following the text segment.
6144 However, the actual runtime layout in memory may put the data
6145 somewhere else, so when we send gdb a data base-address, we
6146 use the real data base address and subtract the compile-time
6147 data base-address from it (which is just the length of the
6148 text segment). BSS immediately follows data in both
6151 *data_p
= data
- (text_end
- text
);
6160 linux_qxfer_osdata (const char *annex
,
6161 unsigned char *readbuf
, unsigned const char *writebuf
,
6162 CORE_ADDR offset
, int len
)
6164 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6167 /* Convert a native/host siginfo object, into/from the siginfo in the
6168 layout of the inferiors' architecture. */
6171 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6175 if (the_low_target
.siginfo_fixup
!= NULL
)
6176 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6178 /* If there was no callback, or the callback didn't do anything,
6179 then just do a straight memcpy. */
6183 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6185 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6190 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6191 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6195 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6197 if (current_thread
== NULL
)
6200 pid
= lwpid_of (current_thread
);
6203 debug_printf ("%s siginfo for lwp %d.\n",
6204 readbuf
!= NULL
? "Reading" : "Writing",
6207 if (offset
>= sizeof (siginfo
))
6210 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6213 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6214 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6215 inferior with a 64-bit GDBSERVER should look the same as debugging it
6216 with a 32-bit GDBSERVER, we need to convert it. */
6217 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6219 if (offset
+ len
> sizeof (siginfo
))
6220 len
= sizeof (siginfo
) - offset
;
6222 if (readbuf
!= NULL
)
6223 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6226 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6228 /* Convert back to ptrace layout before flushing it out. */
6229 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6231 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6238 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6239 so we notice when children change state; as the handler for the
6240 sigsuspend in my_waitpid. */
6243 sigchld_handler (int signo
)
6245 int old_errno
= errno
;
6251 /* fprintf is not async-signal-safe, so call write
6253 if (write (2, "sigchld_handler\n",
6254 sizeof ("sigchld_handler\n") - 1) < 0)
6255 break; /* just ignore */
6259 if (target_is_async_p ())
6260 async_file_mark (); /* trigger a linux_wait */
6266 linux_supports_non_stop (void)
6272 linux_async (int enable
)
6274 int previous
= target_is_async_p ();
6277 debug_printf ("linux_async (%d), previous=%d\n",
6280 if (previous
!= enable
)
6283 sigemptyset (&mask
);
6284 sigaddset (&mask
, SIGCHLD
);
6286 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6290 if (pipe (linux_event_pipe
) == -1)
6292 linux_event_pipe
[0] = -1;
6293 linux_event_pipe
[1] = -1;
6294 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6296 warning ("creating event pipe failed.");
6300 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6301 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6303 /* Register the event loop handler. */
6304 add_file_handler (linux_event_pipe
[0],
6305 handle_target_event
, NULL
);
6307 /* Always trigger a linux_wait. */
6312 delete_file_handler (linux_event_pipe
[0]);
6314 close (linux_event_pipe
[0]);
6315 close (linux_event_pipe
[1]);
6316 linux_event_pipe
[0] = -1;
6317 linux_event_pipe
[1] = -1;
6320 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6327 linux_start_non_stop (int nonstop
)
6329 /* Register or unregister from event-loop accordingly. */
6330 linux_async (nonstop
);
6332 if (target_is_async_p () != (nonstop
!= 0))
6339 linux_supports_multi_process (void)
6344 /* Check if fork events are supported. */
6347 linux_supports_fork_events (void)
6349 return linux_supports_tracefork ();
6352 /* Check if vfork events are supported. */
6355 linux_supports_vfork_events (void)
6357 return linux_supports_tracefork ();
6360 /* Check if exec events are supported. */
6363 linux_supports_exec_events (void)
6365 return linux_supports_traceexec ();
6368 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6369 ptrace flags for all inferiors. This is in case the new GDB connection
6370 doesn't support the same set of events that the previous one did. */
6373 linux_handle_new_gdb_connection (void)
6375 /* Request that all the lwps reset their ptrace options. */
6376 for_each_thread ([] (thread_info
*thread
)
6378 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6382 /* Stop the lwp so we can modify its ptrace options. */
6383 lwp
->must_set_ptrace_flags
= 1;
6384 linux_stop_lwp (lwp
);
6388 /* Already stopped; go ahead and set the ptrace options. */
6389 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6390 int options
= linux_low_ptrace_options (proc
->attached
);
6392 linux_enable_event_reporting (lwpid_of (thread
), options
);
6393 lwp
->must_set_ptrace_flags
= 0;
6399 linux_supports_disable_randomization (void)
6401 #ifdef HAVE_PERSONALITY
6409 linux_supports_agent (void)
6415 linux_supports_range_stepping (void)
6417 if (can_software_single_step ())
6419 if (*the_low_target
.supports_range_stepping
== NULL
)
6422 return (*the_low_target
.supports_range_stepping
) ();
6425 /* Enumerate spufs IDs for process PID. */
6427 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6433 struct dirent
*entry
;
6435 sprintf (path
, "/proc/%ld/fd", pid
);
6436 dir
= opendir (path
);
6441 while ((entry
= readdir (dir
)) != NULL
)
6447 fd
= atoi (entry
->d_name
);
6451 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6452 if (stat (path
, &st
) != 0)
6454 if (!S_ISDIR (st
.st_mode
))
6457 if (statfs (path
, &stfs
) != 0)
6459 if (stfs
.f_type
!= SPUFS_MAGIC
)
6462 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6464 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6474 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6475 object type, using the /proc file system. */
6477 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6478 unsigned const char *writebuf
,
6479 CORE_ADDR offset
, int len
)
6481 long pid
= lwpid_of (current_thread
);
6486 if (!writebuf
&& !readbuf
)
6494 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6497 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6498 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6503 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6510 ret
= write (fd
, writebuf
, (size_t) len
);
6512 ret
= read (fd
, readbuf
, (size_t) len
);
6518 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6519 struct target_loadseg
6521 /* Core address to which the segment is mapped. */
6523 /* VMA recorded in the program header. */
6525 /* Size of this segment in memory. */
6529 # if defined PT_GETDSBT
6530 struct target_loadmap
6532 /* Protocol version number, must be zero. */
6534 /* Pointer to the DSBT table, its size, and the DSBT index. */
6535 unsigned *dsbt_table
;
6536 unsigned dsbt_size
, dsbt_index
;
6537 /* Number of segments in this map. */
6539 /* The actual memory map. */
6540 struct target_loadseg segs
[/*nsegs*/];
6542 # define LINUX_LOADMAP PT_GETDSBT
6543 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6544 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6546 struct target_loadmap
6548 /* Protocol version number, must be zero. */
6550 /* Number of segments in this map. */
6552 /* The actual memory map. */
6553 struct target_loadseg segs
[/*nsegs*/];
6555 # define LINUX_LOADMAP PTRACE_GETFDPIC
6556 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6557 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6561 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6562 unsigned char *myaddr
, unsigned int len
)
6564 int pid
= lwpid_of (current_thread
);
6566 struct target_loadmap
*data
= NULL
;
6567 unsigned int actual_length
, copy_length
;
6569 if (strcmp (annex
, "exec") == 0)
6570 addr
= (int) LINUX_LOADMAP_EXEC
;
6571 else if (strcmp (annex
, "interp") == 0)
6572 addr
= (int) LINUX_LOADMAP_INTERP
;
6576 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6582 actual_length
= sizeof (struct target_loadmap
)
6583 + sizeof (struct target_loadseg
) * data
->nsegs
;
6585 if (offset
< 0 || offset
> actual_length
)
6588 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6589 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6593 # define linux_read_loadmap NULL
6594 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6597 linux_process_qsupported (char **features
, int count
)
6599 if (the_low_target
.process_qsupported
!= NULL
)
6600 the_low_target
.process_qsupported (features
, count
);
6604 linux_supports_catch_syscall (void)
6606 return (the_low_target
.get_syscall_trapinfo
!= NULL
6607 && linux_supports_tracesysgood ());
6611 linux_get_ipa_tdesc_idx (void)
6613 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6616 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6620 linux_supports_tracepoints (void)
6622 if (*the_low_target
.supports_tracepoints
== NULL
)
6625 return (*the_low_target
.supports_tracepoints
) ();
6629 linux_read_pc (struct regcache
*regcache
)
6631 if (the_low_target
.get_pc
== NULL
)
6634 return (*the_low_target
.get_pc
) (regcache
);
6638 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6640 gdb_assert (the_low_target
.set_pc
!= NULL
);
6642 (*the_low_target
.set_pc
) (regcache
, pc
);
6646 linux_thread_stopped (struct thread_info
*thread
)
6648 return get_thread_lwp (thread
)->stopped
;
6651 /* This exposes stop-all-threads functionality to other modules. */
6654 linux_pause_all (int freeze
)
6656 stop_all_lwps (freeze
, NULL
);
6659 /* This exposes unstop-all-threads functionality to other gdbserver
6663 linux_unpause_all (int unfreeze
)
6665 unstop_all_lwps (unfreeze
, NULL
);
6669 linux_prepare_to_access_memory (void)
6671 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6674 linux_pause_all (1);
6679 linux_done_accessing_memory (void)
6681 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6684 linux_unpause_all (1);
6688 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6689 CORE_ADDR collector
,
6692 CORE_ADDR
*jump_entry
,
6693 CORE_ADDR
*trampoline
,
6694 ULONGEST
*trampoline_size
,
6695 unsigned char *jjump_pad_insn
,
6696 ULONGEST
*jjump_pad_insn_size
,
6697 CORE_ADDR
*adjusted_insn_addr
,
6698 CORE_ADDR
*adjusted_insn_addr_end
,
6701 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6702 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6703 jump_entry
, trampoline
, trampoline_size
,
6704 jjump_pad_insn
, jjump_pad_insn_size
,
6705 adjusted_insn_addr
, adjusted_insn_addr_end
,
6709 static struct emit_ops
*
6710 linux_emit_ops (void)
6712 if (the_low_target
.emit_ops
!= NULL
)
6713 return (*the_low_target
.emit_ops
) ();
6719 linux_get_min_fast_tracepoint_insn_len (void)
6721 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6724 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6727 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6728 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6730 char filename
[PATH_MAX
];
6732 const int auxv_size
= is_elf64
6733 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6734 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6736 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6738 fd
= open (filename
, O_RDONLY
);
6744 while (read (fd
, buf
, auxv_size
) == auxv_size
6745 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6749 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6751 switch (aux
->a_type
)
6754 *phdr_memaddr
= aux
->a_un
.a_val
;
6757 *num_phdr
= aux
->a_un
.a_val
;
6763 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6765 switch (aux
->a_type
)
6768 *phdr_memaddr
= aux
->a_un
.a_val
;
6771 *num_phdr
= aux
->a_un
.a_val
;
6779 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6781 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6782 "phdr_memaddr = %ld, phdr_num = %d",
6783 (long) *phdr_memaddr
, *num_phdr
);
6790 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6793 get_dynamic (const int pid
, const int is_elf64
)
6795 CORE_ADDR phdr_memaddr
, relocation
;
6797 unsigned char *phdr_buf
;
6798 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6800 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6803 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6804 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6806 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6809 /* Compute relocation: it is expected to be 0 for "regular" executables,
6810 non-zero for PIE ones. */
6812 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6815 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6817 if (p
->p_type
== PT_PHDR
)
6818 relocation
= phdr_memaddr
- p
->p_vaddr
;
6822 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6824 if (p
->p_type
== PT_PHDR
)
6825 relocation
= phdr_memaddr
- p
->p_vaddr
;
6828 if (relocation
== -1)
6830 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6831 any real world executables, including PIE executables, have always
6832 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6833 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6834 or present DT_DEBUG anyway (fpc binaries are statically linked).
6836 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6838 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6843 for (i
= 0; i
< num_phdr
; i
++)
6847 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6849 if (p
->p_type
== PT_DYNAMIC
)
6850 return p
->p_vaddr
+ relocation
;
6854 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6856 if (p
->p_type
== PT_DYNAMIC
)
6857 return p
->p_vaddr
+ relocation
;
6864 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6865 can be 0 if the inferior does not yet have the library list initialized.
6866 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6867 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6870 get_r_debug (const int pid
, const int is_elf64
)
6872 CORE_ADDR dynamic_memaddr
;
6873 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6874 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6877 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6878 if (dynamic_memaddr
== 0)
6881 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6885 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6886 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6890 unsigned char buf
[sizeof (Elf64_Xword
)];
6894 #ifdef DT_MIPS_RLD_MAP
6895 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6897 if (linux_read_memory (dyn
->d_un
.d_val
,
6898 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6903 #endif /* DT_MIPS_RLD_MAP */
6904 #ifdef DT_MIPS_RLD_MAP_REL
6905 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6907 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6908 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6913 #endif /* DT_MIPS_RLD_MAP_REL */
6915 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6916 map
= dyn
->d_un
.d_val
;
6918 if (dyn
->d_tag
== DT_NULL
)
6923 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6924 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6928 unsigned char buf
[sizeof (Elf32_Word
)];
6932 #ifdef DT_MIPS_RLD_MAP
6933 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6935 if (linux_read_memory (dyn
->d_un
.d_val
,
6936 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6941 #endif /* DT_MIPS_RLD_MAP */
6942 #ifdef DT_MIPS_RLD_MAP_REL
6943 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6945 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6946 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6951 #endif /* DT_MIPS_RLD_MAP_REL */
6953 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6954 map
= dyn
->d_un
.d_val
;
6956 if (dyn
->d_tag
== DT_NULL
)
6960 dynamic_memaddr
+= dyn_size
;
6966 /* Read one pointer from MEMADDR in the inferior. */
6969 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6973 /* Go through a union so this works on either big or little endian
6974 hosts, when the inferior's pointer size is smaller than the size
6975 of CORE_ADDR. It is assumed the inferior's endianness is the
6976 same of the superior's. */
6979 CORE_ADDR core_addr
;
6984 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6987 if (ptr_size
== sizeof (CORE_ADDR
))
6988 *ptr
= addr
.core_addr
;
6989 else if (ptr_size
== sizeof (unsigned int))
6992 gdb_assert_not_reached ("unhandled pointer size");
6997 struct link_map_offsets
6999 /* Offset and size of r_debug.r_version. */
7000 int r_version_offset
;
7002 /* Offset and size of r_debug.r_map. */
7005 /* Offset to l_addr field in struct link_map. */
7008 /* Offset to l_name field in struct link_map. */
7011 /* Offset to l_ld field in struct link_map. */
7014 /* Offset to l_next field in struct link_map. */
7017 /* Offset to l_prev field in struct link_map. */
7021 /* Construct qXfer:libraries-svr4:read reply. */
7024 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
7025 unsigned const char *writebuf
,
7026 CORE_ADDR offset
, int len
)
7029 unsigned document_len
;
7030 struct process_info_private
*const priv
= current_process ()->priv
;
7031 char filename
[PATH_MAX
];
7034 static const struct link_map_offsets lmo_32bit_offsets
=
7036 0, /* r_version offset. */
7037 4, /* r_debug.r_map offset. */
7038 0, /* l_addr offset in link_map. */
7039 4, /* l_name offset in link_map. */
7040 8, /* l_ld offset in link_map. */
7041 12, /* l_next offset in link_map. */
7042 16 /* l_prev offset in link_map. */
7045 static const struct link_map_offsets lmo_64bit_offsets
=
7047 0, /* r_version offset. */
7048 8, /* r_debug.r_map offset. */
7049 0, /* l_addr offset in link_map. */
7050 8, /* l_name offset in link_map. */
7051 16, /* l_ld offset in link_map. */
7052 24, /* l_next offset in link_map. */
7053 32 /* l_prev offset in link_map. */
7055 const struct link_map_offsets
*lmo
;
7056 unsigned int machine
;
7058 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7059 int allocated
= 1024;
7061 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7062 int header_done
= 0;
7064 if (writebuf
!= NULL
)
7066 if (readbuf
== NULL
)
7069 pid
= lwpid_of (current_thread
);
7070 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7071 is_elf64
= elf_64_file_p (filename
, &machine
);
7072 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7073 ptr_size
= is_elf64
? 8 : 4;
7075 while (annex
[0] != '\0')
7081 sep
= strchr (annex
, '=');
7086 if (len
== 5 && startswith (annex
, "start"))
7088 else if (len
== 4 && startswith (annex
, "prev"))
7092 annex
= strchr (sep
, ';');
7099 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7106 if (priv
->r_debug
== 0)
7107 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7109 /* We failed to find DT_DEBUG. Such situation will not change
7110 for this inferior - do not retry it. Report it to GDB as
7111 E01, see for the reasons at the GDB solib-svr4.c side. */
7112 if (priv
->r_debug
== (CORE_ADDR
) -1)
7115 if (priv
->r_debug
!= 0)
7117 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7118 (unsigned char *) &r_version
,
7119 sizeof (r_version
)) != 0
7122 warning ("unexpected r_debug version %d", r_version
);
7124 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7125 &lm_addr
, ptr_size
) != 0)
7127 warning ("unable to read r_map from 0x%lx",
7128 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7133 document
= (char *) xmalloc (allocated
);
7134 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7135 p
= document
+ strlen (document
);
7138 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7139 &l_name
, ptr_size
) == 0
7140 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7141 &l_addr
, ptr_size
) == 0
7142 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7143 &l_ld
, ptr_size
) == 0
7144 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7145 &l_prev
, ptr_size
) == 0
7146 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7147 &l_next
, ptr_size
) == 0)
7149 unsigned char libname
[PATH_MAX
];
7151 if (lm_prev
!= l_prev
)
7153 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7154 (long) lm_prev
, (long) l_prev
);
7158 /* Ignore the first entry even if it has valid name as the first entry
7159 corresponds to the main executable. The first entry should not be
7160 skipped if the dynamic loader was loaded late by a static executable
7161 (see solib-svr4.c parameter ignore_first). But in such case the main
7162 executable does not have PT_DYNAMIC present and this function already
7163 exited above due to failed get_r_debug. */
7166 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7171 /* Not checking for error because reading may stop before
7172 we've got PATH_MAX worth of characters. */
7174 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7175 libname
[sizeof (libname
) - 1] = '\0';
7176 if (libname
[0] != '\0')
7178 /* 6x the size for xml_escape_text below. */
7179 size_t len
= 6 * strlen ((char *) libname
);
7183 /* Terminate `<library-list-svr4'. */
7188 while (allocated
< p
- document
+ len
+ 200)
7190 /* Expand to guarantee sufficient storage. */
7191 uintptr_t document_len
= p
- document
;
7193 document
= (char *) xrealloc (document
, 2 * allocated
);
7195 p
= document
+ document_len
;
7198 std::string name
= xml_escape_text ((char *) libname
);
7199 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7200 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7201 name
.c_str (), (unsigned long) lm_addr
,
7202 (unsigned long) l_addr
, (unsigned long) l_ld
);
7212 /* Empty list; terminate `<library-list-svr4'. */
7216 strcpy (p
, "</library-list-svr4>");
7218 document_len
= strlen (document
);
7219 if (offset
< document_len
)
7220 document_len
-= offset
;
7223 if (len
> document_len
)
7226 memcpy (readbuf
, document
+ offset
, len
);
7232 #ifdef HAVE_LINUX_BTRACE
7234 /* See to_disable_btrace target method. */
7237 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7239 enum btrace_error err
;
7241 err
= linux_disable_btrace (tinfo
);
7242 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7245 /* Encode an Intel Processor Trace configuration. */
7248 linux_low_encode_pt_config (struct buffer
*buffer
,
7249 const struct btrace_data_pt_config
*config
)
7251 buffer_grow_str (buffer
, "<pt-config>\n");
7253 switch (config
->cpu
.vendor
)
7256 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7257 "model=\"%u\" stepping=\"%u\"/>\n",
7258 config
->cpu
.family
, config
->cpu
.model
,
7259 config
->cpu
.stepping
);
7266 buffer_grow_str (buffer
, "</pt-config>\n");
7269 /* Encode a raw buffer. */
7272 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7278 /* We use hex encoding - see common/rsp-low.h. */
7279 buffer_grow_str (buffer
, "<raw>\n");
7285 elem
[0] = tohex ((*data
>> 4) & 0xf);
7286 elem
[1] = tohex (*data
++ & 0xf);
7288 buffer_grow (buffer
, elem
, 2);
7291 buffer_grow_str (buffer
, "</raw>\n");
7294 /* See to_read_btrace target method. */
7297 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7298 enum btrace_read_type type
)
7300 struct btrace_data btrace
;
7301 struct btrace_block
*block
;
7302 enum btrace_error err
;
7305 btrace_data_init (&btrace
);
7307 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7308 if (err
!= BTRACE_ERR_NONE
)
7310 if (err
== BTRACE_ERR_OVERFLOW
)
7311 buffer_grow_str0 (buffer
, "E.Overflow.");
7313 buffer_grow_str0 (buffer
, "E.Generic Error.");
7318 switch (btrace
.format
)
7320 case BTRACE_FORMAT_NONE
:
7321 buffer_grow_str0 (buffer
, "E.No Trace.");
7324 case BTRACE_FORMAT_BTS
:
7325 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7326 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7329 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7331 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7332 paddress (block
->begin
), paddress (block
->end
));
7334 buffer_grow_str0 (buffer
, "</btrace>\n");
7337 case BTRACE_FORMAT_PT
:
7338 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7339 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7340 buffer_grow_str (buffer
, "<pt>\n");
7342 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7344 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7345 btrace
.variant
.pt
.size
);
7347 buffer_grow_str (buffer
, "</pt>\n");
7348 buffer_grow_str0 (buffer
, "</btrace>\n");
7352 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7356 btrace_data_fini (&btrace
);
7360 btrace_data_fini (&btrace
);
7364 /* See to_btrace_conf target method. */
7367 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7368 struct buffer
*buffer
)
7370 const struct btrace_config
*conf
;
7372 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7373 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7375 conf
= linux_btrace_conf (tinfo
);
7378 switch (conf
->format
)
7380 case BTRACE_FORMAT_NONE
:
7383 case BTRACE_FORMAT_BTS
:
7384 buffer_xml_printf (buffer
, "<bts");
7385 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7386 buffer_xml_printf (buffer
, " />\n");
7389 case BTRACE_FORMAT_PT
:
7390 buffer_xml_printf (buffer
, "<pt");
7391 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7392 buffer_xml_printf (buffer
, "/>\n");
7397 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7400 #endif /* HAVE_LINUX_BTRACE */
7402 /* See nat/linux-nat.h. */
7405 current_lwp_ptid (void)
7407 return ptid_of (current_thread
);
7410 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7413 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7415 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7416 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7418 return default_breakpoint_kind_from_pc (pcptr
);
7421 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7423 static const gdb_byte
*
7424 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7426 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7428 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7431 /* Implementation of the target_ops method
7432 "breakpoint_kind_from_current_state". */
7435 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7437 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7438 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7440 return linux_breakpoint_kind_from_pc (pcptr
);
7443 /* Default implementation of linux_target_ops method "set_pc" for
7444 32-bit pc register which is literally named "pc". */
7447 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7449 uint32_t newpc
= pc
;
7451 supply_register_by_name (regcache
, "pc", &newpc
);
7454 /* Default implementation of linux_target_ops method "get_pc" for
7455 32-bit pc register which is literally named "pc". */
7458 linux_get_pc_32bit (struct regcache
*regcache
)
7462 collect_register_by_name (regcache
, "pc", &pc
);
7464 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7468 /* Default implementation of linux_target_ops method "set_pc" for
7469 64-bit pc register which is literally named "pc". */
7472 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7474 uint64_t newpc
= pc
;
7476 supply_register_by_name (regcache
, "pc", &newpc
);
7479 /* Default implementation of linux_target_ops method "get_pc" for
7480 64-bit pc register which is literally named "pc". */
7483 linux_get_pc_64bit (struct regcache
*regcache
)
7487 collect_register_by_name (regcache
, "pc", &pc
);
7489 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7494 static struct target_ops linux_target_ops
= {
7495 linux_create_inferior
,
7496 linux_post_create_inferior
,
7505 linux_fetch_registers
,
7506 linux_store_registers
,
7507 linux_prepare_to_access_memory
,
7508 linux_done_accessing_memory
,
7511 linux_look_up_symbols
,
7512 linux_request_interrupt
,
7514 linux_supports_z_point_type
,
7517 linux_stopped_by_sw_breakpoint
,
7518 linux_supports_stopped_by_sw_breakpoint
,
7519 linux_stopped_by_hw_breakpoint
,
7520 linux_supports_stopped_by_hw_breakpoint
,
7521 linux_supports_hardware_single_step
,
7522 linux_stopped_by_watchpoint
,
7523 linux_stopped_data_address
,
7524 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7525 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7526 && defined(PT_TEXT_END_ADDR)
7531 #ifdef USE_THREAD_DB
7532 thread_db_get_tls_address
,
7537 hostio_last_error_from_errno
,
7540 linux_supports_non_stop
,
7542 linux_start_non_stop
,
7543 linux_supports_multi_process
,
7544 linux_supports_fork_events
,
7545 linux_supports_vfork_events
,
7546 linux_supports_exec_events
,
7547 linux_handle_new_gdb_connection
,
7548 #ifdef USE_THREAD_DB
7549 thread_db_handle_monitor_command
,
7553 linux_common_core_of_thread
,
7555 linux_process_qsupported
,
7556 linux_supports_tracepoints
,
7559 linux_thread_stopped
,
7563 linux_stabilize_threads
,
7564 linux_install_fast_tracepoint_jump_pad
,
7566 linux_supports_disable_randomization
,
7567 linux_get_min_fast_tracepoint_insn_len
,
7568 linux_qxfer_libraries_svr4
,
7569 linux_supports_agent
,
7570 #ifdef HAVE_LINUX_BTRACE
7571 linux_supports_btrace
,
7572 linux_enable_btrace
,
7573 linux_low_disable_btrace
,
7574 linux_low_read_btrace
,
7575 linux_low_btrace_conf
,
7583 linux_supports_range_stepping
,
7584 linux_proc_pid_to_exec_file
,
7585 linux_mntns_open_cloexec
,
7587 linux_mntns_readlink
,
7588 linux_breakpoint_kind_from_pc
,
7589 linux_sw_breakpoint_from_kind
,
7590 linux_proc_tid_get_name
,
7591 linux_breakpoint_kind_from_current_state
,
7592 linux_supports_software_single_step
,
7593 linux_supports_catch_syscall
,
7594 linux_get_ipa_tdesc_idx
,
7596 thread_db_thread_handle
,
7602 #ifdef HAVE_LINUX_REGSETS
7604 initialize_regsets_info (struct regsets_info
*info
)
7606 for (info
->num_regsets
= 0;
7607 info
->regsets
[info
->num_regsets
].size
>= 0;
7608 info
->num_regsets
++)
7614 initialize_low (void)
7616 struct sigaction sigchld_action
;
7618 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7619 set_target_ops (&linux_target_ops
);
7621 linux_ptrace_init_warnings ();
7623 sigchld_action
.sa_handler
= sigchld_handler
;
7624 sigemptyset (&sigchld_action
.sa_mask
);
7625 sigchld_action
.sa_flags
= SA_RESTART
;
7626 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7628 initialize_low_arch ();
7630 linux_check_ptrace_features ();