1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2017 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "linux-low.h"
21 #include "nat/linux-osdata.h"
25 #include "signals-state-save-restore.h"
26 #include "nat/linux-nat.h"
27 #include "nat/linux-waitpid.h"
29 #include "nat/gdb_ptrace.h"
30 #include "nat/linux-ptrace.h"
31 #include "nat/linux-procfs.h"
32 #include "nat/linux-personality.h"
34 #include <sys/ioctl.h>
37 #include <sys/syscall.h>
41 #include <sys/types.h>
46 #include "filestuff.h"
47 #include "tracepoint.h"
50 #include "common-inferior.h"
51 #include "nat/fork-inferior.h"
54 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
55 then ELFMAG0 will have been defined. If it didn't get included by
56 gdb_proc_service.h then including it will likely introduce a duplicate
57 definition of elf_fpregset_t. */
60 #include "nat/linux-namespaces.h"
63 #define SPUFS_MAGIC 0x23c9b64e
66 #ifdef HAVE_PERSONALITY
67 # include <sys/personality.h>
68 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
69 # define ADDR_NO_RANDOMIZE 0x0040000
77 /* Some targets did not define these ptrace constants from the start,
78 so gdbserver defines them locally here. In the future, these may
79 be removed after they are added to asm/ptrace.h. */
80 #if !(defined(PT_TEXT_ADDR) \
81 || defined(PT_DATA_ADDR) \
82 || defined(PT_TEXT_END_ADDR))
83 #if defined(__mcoldfire__)
84 /* These are still undefined in 3.10 kernels. */
85 #define PT_TEXT_ADDR 49*4
86 #define PT_DATA_ADDR 50*4
87 #define PT_TEXT_END_ADDR 51*4
88 /* BFIN already defines these since at least 2.6.32 kernels. */
90 #define PT_TEXT_ADDR 220
91 #define PT_TEXT_END_ADDR 224
92 #define PT_DATA_ADDR 228
93 /* These are still undefined in 3.10 kernels. */
94 #elif defined(__TMS320C6X__)
95 #define PT_TEXT_ADDR (0x10000*4)
96 #define PT_DATA_ADDR (0x10004*4)
97 #define PT_TEXT_END_ADDR (0x10008*4)
101 #ifdef HAVE_LINUX_BTRACE
102 # include "nat/linux-btrace.h"
103 # include "btrace-common.h"
106 #ifndef HAVE_ELF32_AUXV_T
107 /* Copied from glibc's elf.h. */
110 uint32_t a_type
; /* Entry type */
113 uint32_t a_val
; /* Integer value */
114 /* We use to have pointer elements added here. We cannot do that,
115 though, since it does not work when using 32-bit definitions
116 on 64-bit platforms and vice versa. */
121 #ifndef HAVE_ELF64_AUXV_T
122 /* Copied from glibc's elf.h. */
125 uint64_t a_type
; /* Entry type */
128 uint64_t a_val
; /* Integer value */
129 /* We use to have pointer elements added here. We cannot do that,
130 though, since it does not work when using 32-bit definitions
131 on 64-bit platforms and vice versa. */
136 /* Does the current host support PTRACE_GETREGSET? */
137 int have_ptrace_getregset
= -1;
141 /* See nat/linux-nat.h. */
144 ptid_of_lwp (struct lwp_info
*lwp
)
146 return ptid_of (get_lwp_thread (lwp
));
149 /* See nat/linux-nat.h. */
152 lwp_set_arch_private_info (struct lwp_info
*lwp
,
153 struct arch_lwp_info
*info
)
155 lwp
->arch_private
= info
;
158 /* See nat/linux-nat.h. */
160 struct arch_lwp_info
*
161 lwp_arch_private_info (struct lwp_info
*lwp
)
163 return lwp
->arch_private
;
166 /* See nat/linux-nat.h. */
169 lwp_is_stopped (struct lwp_info
*lwp
)
174 /* See nat/linux-nat.h. */
176 enum target_stop_reason
177 lwp_stop_reason (struct lwp_info
*lwp
)
179 return lwp
->stop_reason
;
182 /* See nat/linux-nat.h. */
185 lwp_is_stepping (struct lwp_info
*lwp
)
187 return lwp
->stepping
;
190 /* A list of all unknown processes which receive stop signals. Some
191 other process will presumably claim each of these as forked
192 children momentarily. */
194 struct simple_pid_list
196 /* The process ID. */
199 /* The status as reported by waitpid. */
203 struct simple_pid_list
*next
;
205 struct simple_pid_list
*stopped_pids
;
207 /* Trivial list manipulation functions to keep track of a list of new
208 stopped processes. */
211 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
213 struct simple_pid_list
*new_pid
= XNEW (struct simple_pid_list
);
216 new_pid
->status
= status
;
217 new_pid
->next
= *listp
;
222 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
224 struct simple_pid_list
**p
;
226 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
227 if ((*p
)->pid
== pid
)
229 struct simple_pid_list
*next
= (*p
)->next
;
231 *statusp
= (*p
)->status
;
239 enum stopping_threads_kind
241 /* Not stopping threads presently. */
242 NOT_STOPPING_THREADS
,
244 /* Stopping threads. */
247 /* Stopping and suspending threads. */
248 STOPPING_AND_SUSPENDING_THREADS
251 /* This is set while stop_all_lwps is in effect. */
252 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
254 /* FIXME make into a target method? */
255 int using_threads
= 1;
257 /* True if we're presently stabilizing threads (moving them out of
259 static int stabilizing_threads
;
261 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
262 int step
, int signal
, siginfo_t
*info
);
263 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
264 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
265 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
266 static void unsuspend_all_lwps (struct lwp_info
*except
);
267 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
268 int *wstat
, int options
);
269 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
270 static struct lwp_info
*add_lwp (ptid_t ptid
);
271 static void linux_mourn (struct process_info
*process
);
272 static int linux_stopped_by_watchpoint (void);
273 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
274 static int lwp_is_marked_dead (struct lwp_info
*lwp
);
275 static void proceed_all_lwps (void);
276 static int finish_step_over (struct lwp_info
*lwp
);
277 static int kill_lwp (unsigned long lwpid
, int signo
);
278 static void enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
);
279 static void complete_ongoing_step_over (void);
280 static int linux_low_ptrace_options (int attached
);
281 static int check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
);
282 static int proceed_one_lwp (thread_info
*thread
, void *except
);
284 /* When the event-loop is doing a step-over, this points at the thread
286 ptid_t step_over_bkpt
;
288 /* True if the low target can hardware single-step. */
291 can_hardware_single_step (void)
293 if (the_low_target
.supports_hardware_single_step
!= NULL
)
294 return the_low_target
.supports_hardware_single_step ();
299 /* True if the low target can software single-step. Such targets
300 implement the GET_NEXT_PCS callback. */
303 can_software_single_step (void)
305 return (the_low_target
.get_next_pcs
!= NULL
);
308 /* True if the low target supports memory breakpoints. If so, we'll
309 have a GET_PC implementation. */
312 supports_breakpoints (void)
314 return (the_low_target
.get_pc
!= NULL
);
317 /* Returns true if this target can support fast tracepoints. This
318 does not mean that the in-process agent has been loaded in the
322 supports_fast_tracepoints (void)
324 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
327 /* True if LWP is stopped in its stepping range. */
330 lwp_in_step_range (struct lwp_info
*lwp
)
332 CORE_ADDR pc
= lwp
->stop_pc
;
334 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
337 struct pending_signals
341 struct pending_signals
*prev
;
344 /* The read/write ends of the pipe registered as waitable file in the
346 static int linux_event_pipe
[2] = { -1, -1 };
348 /* True if we're currently in async mode. */
349 #define target_is_async_p() (linux_event_pipe[0] != -1)
351 static void send_sigstop (struct lwp_info
*lwp
);
352 static void wait_for_sigstop (void);
354 /* Return non-zero if HEADER is a 64-bit ELF file. */
357 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
359 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
360 && header
->e_ident
[EI_MAG1
] == ELFMAG1
361 && header
->e_ident
[EI_MAG2
] == ELFMAG2
362 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
364 *machine
= header
->e_machine
;
365 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
372 /* Return non-zero if FILE is a 64-bit ELF file,
373 zero if the file is not a 64-bit ELF file,
374 and -1 if the file is not accessible or doesn't exist. */
377 elf_64_file_p (const char *file
, unsigned int *machine
)
382 fd
= open (file
, O_RDONLY
);
386 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
393 return elf_64_header_p (&header
, machine
);
396 /* Accepts an integer PID; Returns true if the executable PID is
397 running is a 64-bit ELF file.. */
400 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
404 sprintf (file
, "/proc/%d/exe", pid
);
405 return elf_64_file_p (file
, machine
);
409 delete_lwp (struct lwp_info
*lwp
)
411 struct thread_info
*thr
= get_lwp_thread (lwp
);
414 debug_printf ("deleting %ld\n", lwpid_of (thr
));
418 if (the_low_target
.delete_thread
!= NULL
)
419 the_low_target
.delete_thread (lwp
->arch_private
);
421 gdb_assert (lwp
->arch_private
== NULL
);
426 /* Add a process to the common process list, and set its private
429 static struct process_info
*
430 linux_add_process (int pid
, int attached
)
432 struct process_info
*proc
;
434 proc
= add_process (pid
, attached
);
435 proc
->priv
= XCNEW (struct process_info_private
);
437 if (the_low_target
.new_process
!= NULL
)
438 proc
->priv
->arch_private
= the_low_target
.new_process ();
443 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
445 /* Call the target arch_setup function on the current thread. */
448 linux_arch_setup (void)
450 the_low_target
.arch_setup ();
453 /* Call the target arch_setup function on THREAD. */
456 linux_arch_setup_thread (struct thread_info
*thread
)
458 struct thread_info
*saved_thread
;
460 saved_thread
= current_thread
;
461 current_thread
= thread
;
465 current_thread
= saved_thread
;
468 /* Handle a GNU/Linux extended wait response. If we see a clone,
469 fork, or vfork event, we need to add the new LWP to our list
470 (and return 0 so as not to report the trap to higher layers).
471 If we see an exec event, we will modify ORIG_EVENT_LWP to point
472 to a new LWP representing the new program. */
475 handle_extended_wait (struct lwp_info
**orig_event_lwp
, int wstat
)
477 struct lwp_info
*event_lwp
= *orig_event_lwp
;
478 int event
= linux_ptrace_get_extended_event (wstat
);
479 struct thread_info
*event_thr
= get_lwp_thread (event_lwp
);
480 struct lwp_info
*new_lwp
;
482 gdb_assert (event_lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
484 /* All extended events we currently use are mid-syscall. Only
485 PTRACE_EVENT_STOP is delivered more like a signal-stop, but
486 you have to be using PTRACE_SEIZE to get that. */
487 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
489 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
490 || (event
== PTRACE_EVENT_CLONE
))
493 unsigned long new_pid
;
496 /* Get the pid of the new lwp. */
497 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
500 /* If we haven't already seen the new PID stop, wait for it now. */
501 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
503 /* The new child has a pending SIGSTOP. We can't affect it until it
504 hits the SIGSTOP, but we're already attached. */
506 ret
= my_waitpid (new_pid
, &status
, __WALL
);
509 perror_with_name ("waiting for new child");
510 else if (ret
!= new_pid
)
511 warning ("wait returned unexpected PID %d", ret
);
512 else if (!WIFSTOPPED (status
))
513 warning ("wait returned unexpected status 0x%x", status
);
516 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
518 struct process_info
*parent_proc
;
519 struct process_info
*child_proc
;
520 struct lwp_info
*child_lwp
;
521 struct thread_info
*child_thr
;
522 struct target_desc
*tdesc
;
524 ptid
= ptid_build (new_pid
, new_pid
, 0);
528 debug_printf ("HEW: Got fork event from LWP %ld, "
530 ptid_get_lwp (ptid_of (event_thr
)),
531 ptid_get_pid (ptid
));
534 /* Add the new process to the tables and clone the breakpoint
535 lists of the parent. We need to do this even if the new process
536 will be detached, since we will need the process object and the
537 breakpoints to remove any breakpoints from memory when we
538 detach, and the client side will access registers. */
539 child_proc
= linux_add_process (new_pid
, 0);
540 gdb_assert (child_proc
!= NULL
);
541 child_lwp
= add_lwp (ptid
);
542 gdb_assert (child_lwp
!= NULL
);
543 child_lwp
->stopped
= 1;
544 child_lwp
->must_set_ptrace_flags
= 1;
545 child_lwp
->status_pending_p
= 0;
546 child_thr
= get_lwp_thread (child_lwp
);
547 child_thr
->last_resume_kind
= resume_stop
;
548 child_thr
->last_status
.kind
= TARGET_WAITKIND_STOPPED
;
550 /* If we're suspending all threads, leave this one suspended
551 too. If the fork/clone parent is stepping over a breakpoint,
552 all other threads have been suspended already. Leave the
553 child suspended too. */
554 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
555 || event_lwp
->bp_reinsert
!= 0)
558 debug_printf ("HEW: leaving child suspended\n");
559 child_lwp
->suspended
= 1;
562 parent_proc
= get_thread_process (event_thr
);
563 child_proc
->attached
= parent_proc
->attached
;
565 if (event_lwp
->bp_reinsert
!= 0
566 && can_software_single_step ()
567 && event
== PTRACE_EVENT_VFORK
)
569 /* If we leave single-step breakpoints there, child will
570 hit it, so uninsert single-step breakpoints from parent
571 (and child). Once vfork child is done, reinsert
572 them back to parent. */
573 uninsert_single_step_breakpoints (event_thr
);
576 clone_all_breakpoints (child_thr
, event_thr
);
578 tdesc
= allocate_target_description ();
579 copy_target_description (tdesc
, parent_proc
->tdesc
);
580 child_proc
->tdesc
= tdesc
;
582 /* Clone arch-specific process data. */
583 if (the_low_target
.new_fork
!= NULL
)
584 the_low_target
.new_fork (parent_proc
, child_proc
);
586 /* Save fork info in the parent thread. */
587 if (event
== PTRACE_EVENT_FORK
)
588 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
589 else if (event
== PTRACE_EVENT_VFORK
)
590 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
592 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
594 /* The status_pending field contains bits denoting the
595 extended event, so when the pending event is handled,
596 the handler will look at lwp->waitstatus. */
597 event_lwp
->status_pending_p
= 1;
598 event_lwp
->status_pending
= wstat
;
600 /* Link the threads until the parent event is passed on to
602 event_lwp
->fork_relative
= child_lwp
;
603 child_lwp
->fork_relative
= event_lwp
;
605 /* If the parent thread is doing step-over with single-step
606 breakpoints, the list of single-step breakpoints are cloned
607 from the parent's. Remove them from the child process.
608 In case of vfork, we'll reinsert them back once vforked
610 if (event_lwp
->bp_reinsert
!= 0
611 && can_software_single_step ())
613 /* The child process is forked and stopped, so it is safe
614 to access its memory without stopping all other threads
615 from other processes. */
616 delete_single_step_breakpoints (child_thr
);
618 gdb_assert (has_single_step_breakpoints (event_thr
));
619 gdb_assert (!has_single_step_breakpoints (child_thr
));
622 /* Report the event. */
627 debug_printf ("HEW: Got clone event "
628 "from LWP %ld, new child is LWP %ld\n",
629 lwpid_of (event_thr
), new_pid
);
631 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
632 new_lwp
= add_lwp (ptid
);
634 /* Either we're going to immediately resume the new thread
635 or leave it stopped. linux_resume_one_lwp is a nop if it
636 thinks the thread is currently running, so set this first
637 before calling linux_resume_one_lwp. */
638 new_lwp
->stopped
= 1;
640 /* If we're suspending all threads, leave this one suspended
641 too. If the fork/clone parent is stepping over a breakpoint,
642 all other threads have been suspended already. Leave the
643 child suspended too. */
644 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
645 || event_lwp
->bp_reinsert
!= 0)
646 new_lwp
->suspended
= 1;
648 /* Normally we will get the pending SIGSTOP. But in some cases
649 we might get another signal delivered to the group first.
650 If we do get another signal, be sure not to lose it. */
651 if (WSTOPSIG (status
) != SIGSTOP
)
653 new_lwp
->stop_expected
= 1;
654 new_lwp
->status_pending_p
= 1;
655 new_lwp
->status_pending
= status
;
657 else if (report_thread_events
)
659 new_lwp
->waitstatus
.kind
= TARGET_WAITKIND_THREAD_CREATED
;
660 new_lwp
->status_pending_p
= 1;
661 new_lwp
->status_pending
= status
;
664 thread_db_notice_clone (event_thr
, ptid
);
666 /* Don't report the event. */
669 else if (event
== PTRACE_EVENT_VFORK_DONE
)
671 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
673 if (event_lwp
->bp_reinsert
!= 0 && can_software_single_step ())
675 reinsert_single_step_breakpoints (event_thr
);
677 gdb_assert (has_single_step_breakpoints (event_thr
));
680 /* Report the event. */
683 else if (event
== PTRACE_EVENT_EXEC
&& report_exec_events
)
685 struct process_info
*proc
;
686 std::vector
<int> syscalls_to_catch
;
692 debug_printf ("HEW: Got exec event from LWP %ld\n",
693 lwpid_of (event_thr
));
696 /* Get the event ptid. */
697 event_ptid
= ptid_of (event_thr
);
698 event_pid
= ptid_get_pid (event_ptid
);
700 /* Save the syscall list from the execing process. */
701 proc
= get_thread_process (event_thr
);
702 syscalls_to_catch
= std::move (proc
->syscalls_to_catch
);
704 /* Delete the execing process and all its threads. */
706 current_thread
= NULL
;
708 /* Create a new process/lwp/thread. */
709 proc
= linux_add_process (event_pid
, 0);
710 event_lwp
= add_lwp (event_ptid
);
711 event_thr
= get_lwp_thread (event_lwp
);
712 gdb_assert (current_thread
== event_thr
);
713 linux_arch_setup_thread (event_thr
);
715 /* Set the event status. */
716 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
717 event_lwp
->waitstatus
.value
.execd_pathname
718 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
720 /* Mark the exec status as pending. */
721 event_lwp
->stopped
= 1;
722 event_lwp
->status_pending_p
= 1;
723 event_lwp
->status_pending
= wstat
;
724 event_thr
->last_resume_kind
= resume_continue
;
725 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
727 /* Update syscall state in the new lwp, effectively mid-syscall too. */
728 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
730 /* Restore the list to catch. Don't rely on the client, which is free
731 to avoid sending a new list when the architecture doesn't change.
732 Also, for ANY_SYSCALL, the architecture doesn't really matter. */
733 proc
->syscalls_to_catch
= std::move (syscalls_to_catch
);
735 /* Report the event. */
736 *orig_event_lwp
= event_lwp
;
740 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
743 /* Return the PC as read from the regcache of LWP, without any
747 get_pc (struct lwp_info
*lwp
)
749 struct thread_info
*saved_thread
;
750 struct regcache
*regcache
;
753 if (the_low_target
.get_pc
== NULL
)
756 saved_thread
= current_thread
;
757 current_thread
= get_lwp_thread (lwp
);
759 regcache
= get_thread_regcache (current_thread
, 1);
760 pc
= (*the_low_target
.get_pc
) (regcache
);
763 debug_printf ("pc is 0x%lx\n", (long) pc
);
765 current_thread
= saved_thread
;
769 /* This function should only be called if LWP got a SYSCALL_SIGTRAP.
770 Fill *SYSNO with the syscall nr trapped. */
773 get_syscall_trapinfo (struct lwp_info
*lwp
, int *sysno
)
775 struct thread_info
*saved_thread
;
776 struct regcache
*regcache
;
778 if (the_low_target
.get_syscall_trapinfo
== NULL
)
780 /* If we cannot get the syscall trapinfo, report an unknown
781 system call number. */
782 *sysno
= UNKNOWN_SYSCALL
;
786 saved_thread
= current_thread
;
787 current_thread
= get_lwp_thread (lwp
);
789 regcache
= get_thread_regcache (current_thread
, 1);
790 (*the_low_target
.get_syscall_trapinfo
) (regcache
, sysno
);
793 debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno
);
795 current_thread
= saved_thread
;
798 static int check_stopped_by_watchpoint (struct lwp_info
*child
);
800 /* Called when the LWP stopped for a signal/trap. If it stopped for a
801 trap check what caused it (breakpoint, watchpoint, trace, etc.),
802 and save the result in the LWP's stop_reason field. If it stopped
803 for a breakpoint, decrement the PC if necessary on the lwp's
804 architecture. Returns true if we now have the LWP's stop PC. */
807 save_stop_reason (struct lwp_info
*lwp
)
810 CORE_ADDR sw_breakpoint_pc
;
811 struct thread_info
*saved_thread
;
812 #if USE_SIGTRAP_SIGINFO
816 if (the_low_target
.get_pc
== NULL
)
820 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
822 /* breakpoint_at reads from the current thread. */
823 saved_thread
= current_thread
;
824 current_thread
= get_lwp_thread (lwp
);
826 #if USE_SIGTRAP_SIGINFO
827 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
828 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
830 if (siginfo
.si_signo
== SIGTRAP
)
832 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
)
833 && GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
835 /* The si_code is ambiguous on this arch -- check debug
837 if (!check_stopped_by_watchpoint (lwp
))
838 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
840 else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
842 /* If we determine the LWP stopped for a SW breakpoint,
843 trust it. Particularly don't check watchpoint
844 registers, because at least on s390, we'd find
845 stopped-by-watchpoint as long as there's a watchpoint
847 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
849 else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
851 /* This can indicate either a hardware breakpoint or
852 hardware watchpoint. Check debug registers. */
853 if (!check_stopped_by_watchpoint (lwp
))
854 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
856 else if (siginfo
.si_code
== TRAP_TRACE
)
858 /* We may have single stepped an instruction that
859 triggered a watchpoint. In that case, on some
860 architectures (such as x86), instead of TRAP_HWBKPT,
861 si_code indicates TRAP_TRACE, and we need to check
862 the debug registers separately. */
863 if (!check_stopped_by_watchpoint (lwp
))
864 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
869 /* We may have just stepped a breakpoint instruction. E.g., in
870 non-stop mode, GDB first tells the thread A to step a range, and
871 then the user inserts a breakpoint inside the range. In that
872 case we need to report the breakpoint PC. */
873 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
874 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
875 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
877 if (hardware_breakpoint_inserted_here (pc
))
878 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
880 if (lwp
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
)
881 check_stopped_by_watchpoint (lwp
);
884 if (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
888 struct thread_info
*thr
= get_lwp_thread (lwp
);
890 debug_printf ("CSBB: %s stopped by software breakpoint\n",
891 target_pid_to_str (ptid_of (thr
)));
894 /* Back up the PC if necessary. */
895 if (pc
!= sw_breakpoint_pc
)
897 struct regcache
*regcache
898 = get_thread_regcache (current_thread
, 1);
899 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
902 /* Update this so we record the correct stop PC below. */
903 pc
= sw_breakpoint_pc
;
905 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
)
909 struct thread_info
*thr
= get_lwp_thread (lwp
);
911 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
912 target_pid_to_str (ptid_of (thr
)));
915 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
919 struct thread_info
*thr
= get_lwp_thread (lwp
);
921 debug_printf ("CSBB: %s stopped by hardware watchpoint\n",
922 target_pid_to_str (ptid_of (thr
)));
925 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
)
929 struct thread_info
*thr
= get_lwp_thread (lwp
);
931 debug_printf ("CSBB: %s stopped by trace\n",
932 target_pid_to_str (ptid_of (thr
)));
937 current_thread
= saved_thread
;
941 static struct lwp_info
*
942 add_lwp (ptid_t ptid
)
944 struct lwp_info
*lwp
;
946 lwp
= XCNEW (struct lwp_info
);
948 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
950 if (the_low_target
.new_thread
!= NULL
)
951 the_low_target
.new_thread (lwp
);
953 lwp
->thread
= add_thread (ptid
, lwp
);
958 /* Callback to be used when calling fork_inferior, responsible for
959 actually initiating the tracing of the inferior. */
964 if (ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0,
965 (PTRACE_TYPE_ARG4
) 0) < 0)
966 trace_start_error_with_name ("ptrace");
968 if (setpgid (0, 0) < 0)
969 trace_start_error_with_name ("setpgid");
971 /* If GDBserver is connected to gdb via stdio, redirect the inferior's
972 stdout to stderr so that inferior i/o doesn't corrupt the connection.
973 Also, redirect stdin to /dev/null. */
974 if (remote_connection_is_stdio ())
977 trace_start_error_with_name ("close");
978 if (open ("/dev/null", O_RDONLY
) < 0)
979 trace_start_error_with_name ("open");
981 trace_start_error_with_name ("dup2");
982 if (write (2, "stdin/stdout redirected\n",
983 sizeof ("stdin/stdout redirected\n") - 1) < 0)
985 /* Errors ignored. */;
990 /* Start an inferior process and returns its pid.
991 PROGRAM is the name of the program to be started, and PROGRAM_ARGS
992 are its arguments. */
995 linux_create_inferior (const char *program
,
996 const std::vector
<char *> &program_args
)
998 struct lwp_info
*new_lwp
;
1003 maybe_disable_address_space_randomization restore_personality
1004 (disable_randomization
);
1005 std::string str_program_args
= stringify_argv (program_args
);
1007 pid
= fork_inferior (program
,
1008 str_program_args
.c_str (),
1009 get_environ ()->envp (), linux_ptrace_fun
,
1010 NULL
, NULL
, NULL
, NULL
);
1013 linux_add_process (pid
, 0);
1015 ptid
= ptid_build (pid
, pid
, 0);
1016 new_lwp
= add_lwp (ptid
);
1017 new_lwp
->must_set_ptrace_flags
= 1;
1019 post_fork_inferior (pid
, program
);
1024 /* Implement the post_create_inferior target_ops method. */
1027 linux_post_create_inferior (void)
1029 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
1031 linux_arch_setup ();
1033 if (lwp
->must_set_ptrace_flags
)
1035 struct process_info
*proc
= current_process ();
1036 int options
= linux_low_ptrace_options (proc
->attached
);
1038 linux_enable_event_reporting (lwpid_of (current_thread
), options
);
1039 lwp
->must_set_ptrace_flags
= 0;
1043 /* Attach to an inferior process. Returns 0 on success, ERRNO on
1047 linux_attach_lwp (ptid_t ptid
)
1049 struct lwp_info
*new_lwp
;
1050 int lwpid
= ptid_get_lwp (ptid
);
1052 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
1056 new_lwp
= add_lwp (ptid
);
1058 /* We need to wait for SIGSTOP before being able to make the next
1059 ptrace call on this LWP. */
1060 new_lwp
->must_set_ptrace_flags
= 1;
1062 if (linux_proc_pid_is_stopped (lwpid
))
1065 debug_printf ("Attached to a stopped process\n");
1067 /* The process is definitely stopped. It is in a job control
1068 stop, unless the kernel predates the TASK_STOPPED /
1069 TASK_TRACED distinction, in which case it might be in a
1070 ptrace stop. Make sure it is in a ptrace stop; from there we
1071 can kill it, signal it, et cetera.
1073 First make sure there is a pending SIGSTOP. Since we are
1074 already attached, the process can not transition from stopped
1075 to running without a PTRACE_CONT; so we know this signal will
1076 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1077 probably already in the queue (unless this kernel is old
1078 enough to use TASK_STOPPED for ptrace stops); but since
1079 SIGSTOP is not an RT signal, it can only be queued once. */
1080 kill_lwp (lwpid
, SIGSTOP
);
1082 /* Finally, resume the stopped process. This will deliver the
1083 SIGSTOP (or a higher priority signal, just like normal
1084 PTRACE_ATTACH), which we'll catch later on. */
1085 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1088 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
1089 brings it to a halt.
1091 There are several cases to consider here:
1093 1) gdbserver has already attached to the process and is being notified
1094 of a new thread that is being created.
1095 In this case we should ignore that SIGSTOP and resume the
1096 process. This is handled below by setting stop_expected = 1,
1097 and the fact that add_thread sets last_resume_kind ==
1100 2) This is the first thread (the process thread), and we're attaching
1101 to it via attach_inferior.
1102 In this case we want the process thread to stop.
1103 This is handled by having linux_attach set last_resume_kind ==
1104 resume_stop after we return.
1106 If the pid we are attaching to is also the tgid, we attach to and
1107 stop all the existing threads. Otherwise, we attach to pid and
1108 ignore any other threads in the same group as this pid.
1110 3) GDB is connecting to gdbserver and is requesting an enumeration of all
1112 In this case we want the thread to stop.
1113 FIXME: This case is currently not properly handled.
1114 We should wait for the SIGSTOP but don't. Things work apparently
1115 because enough time passes between when we ptrace (ATTACH) and when
1116 gdb makes the next ptrace call on the thread.
1118 On the other hand, if we are currently trying to stop all threads, we
1119 should treat the new thread as if we had sent it a SIGSTOP. This works
1120 because we are guaranteed that the add_lwp call above added us to the
1121 end of the list, and so the new thread has not yet reached
1122 wait_for_sigstop (but will). */
1123 new_lwp
->stop_expected
= 1;
1128 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
1129 already attached. Returns true if a new LWP is found, false
1133 attach_proc_task_lwp_callback (ptid_t ptid
)
1135 /* Is this a new thread? */
1136 if (find_thread_ptid (ptid
) == NULL
)
1138 int lwpid
= ptid_get_lwp (ptid
);
1142 debug_printf ("Found new lwp %d\n", lwpid
);
1144 err
= linux_attach_lwp (ptid
);
1146 /* Be quiet if we simply raced with the thread exiting. EPERM
1147 is returned if the thread's task still exists, and is marked
1148 as exited or zombie, as well as other conditions, so in that
1149 case, confirm the status in /proc/PID/status. */
1151 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1155 debug_printf ("Cannot attach to lwp %d: "
1156 "thread is gone (%d: %s)\n",
1157 lwpid
, err
, strerror (err
));
1162 warning (_("Cannot attach to lwp %d: %s"),
1164 linux_ptrace_attach_fail_reason_string (ptid
, err
));
1172 static void async_file_mark (void);
1174 /* Attach to PID. If PID is the tgid, attach to it and all
1178 linux_attach (unsigned long pid
)
1180 struct process_info
*proc
;
1181 struct thread_info
*initial_thread
;
1182 ptid_t ptid
= ptid_build (pid
, pid
, 0);
1185 /* Attach to PID. We will check for other threads
1187 err
= linux_attach_lwp (ptid
);
1189 error ("Cannot attach to process %ld: %s",
1190 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
1192 proc
= linux_add_process (pid
, 1);
1194 /* Don't ignore the initial SIGSTOP if we just attached to this
1195 process. It will be collected by wait shortly. */
1196 initial_thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
1197 initial_thread
->last_resume_kind
= resume_stop
;
1199 /* We must attach to every LWP. If /proc is mounted, use that to
1200 find them now. On the one hand, the inferior may be using raw
1201 clone instead of using pthreads. On the other hand, even if it
1202 is using pthreads, GDB may not be connected yet (thread_db needs
1203 to do symbol lookups, through qSymbol). Also, thread_db walks
1204 structures in the inferior's address space to find the list of
1205 threads/LWPs, and those structures may well be corrupted. Note
1206 that once thread_db is loaded, we'll still use it to list threads
1207 and associate pthread info with each LWP. */
1208 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1210 /* GDB will shortly read the xml target description for this
1211 process, to figure out the process' architecture. But the target
1212 description is only filled in when the first process/thread in
1213 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1214 that now, otherwise, if GDB is fast enough, it could read the
1215 target description _before_ that initial stop. */
1218 struct lwp_info
*lwp
;
1220 ptid_t pid_ptid
= pid_to_ptid (pid
);
1222 lwpid
= linux_wait_for_event_filtered (pid_ptid
, pid_ptid
,
1224 gdb_assert (lwpid
> 0);
1226 lwp
= find_lwp_pid (pid_to_ptid (lwpid
));
1228 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGSTOP
)
1230 lwp
->status_pending_p
= 1;
1231 lwp
->status_pending
= wstat
;
1234 initial_thread
->last_resume_kind
= resume_continue
;
1238 gdb_assert (proc
->tdesc
!= NULL
);
1245 last_thread_of_process_p (int pid
)
1247 bool seen_one
= false;
1249 thread_info
*thread
= find_thread (pid
, [&] (thread_info
*thread
)
1253 /* This is the first thread of this process we see. */
1259 /* This is the second thread of this process we see. */
1264 return thread
== NULL
;
1270 linux_kill_one_lwp (struct lwp_info
*lwp
)
1272 struct thread_info
*thr
= get_lwp_thread (lwp
);
1273 int pid
= lwpid_of (thr
);
1275 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1276 there is no signal context, and ptrace(PTRACE_KILL) (or
1277 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1278 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1279 alternative is to kill with SIGKILL. We only need one SIGKILL
1280 per process, not one for each thread. But since we still support
1281 support debugging programs using raw clone without CLONE_THREAD,
1282 we send one for each thread. For years, we used PTRACE_KILL
1283 only, so we're being a bit paranoid about some old kernels where
1284 PTRACE_KILL might work better (dubious if there are any such, but
1285 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1286 second, and so we're fine everywhere. */
1289 kill_lwp (pid
, SIGKILL
);
1292 int save_errno
= errno
;
1294 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1295 target_pid_to_str (ptid_of (thr
)),
1296 save_errno
? strerror (save_errno
) : "OK");
1300 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1303 int save_errno
= errno
;
1305 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1306 target_pid_to_str (ptid_of (thr
)),
1307 save_errno
? strerror (save_errno
) : "OK");
1311 /* Kill LWP and wait for it to die. */
1314 kill_wait_lwp (struct lwp_info
*lwp
)
1316 struct thread_info
*thr
= get_lwp_thread (lwp
);
1317 int pid
= ptid_get_pid (ptid_of (thr
));
1318 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1323 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1327 linux_kill_one_lwp (lwp
);
1329 /* Make sure it died. Notes:
1331 - The loop is most likely unnecessary.
1333 - We don't use linux_wait_for_event as that could delete lwps
1334 while we're iterating over them. We're not interested in
1335 any pending status at this point, only in making sure all
1336 wait status on the kernel side are collected until the
1339 - We don't use __WALL here as the __WALL emulation relies on
1340 SIGCHLD, and killing a stopped process doesn't generate
1341 one, nor an exit status.
1343 res
= my_waitpid (lwpid
, &wstat
, 0);
1344 if (res
== -1 && errno
== ECHILD
)
1345 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1346 } while (res
> 0 && WIFSTOPPED (wstat
));
1348 /* Even if it was stopped, the child may have already disappeared.
1349 E.g., if it was killed by SIGKILL. */
1350 if (res
< 0 && errno
!= ECHILD
)
1351 perror_with_name ("kill_wait_lwp");
1354 /* Callback for `for_each_thread'. Kills an lwp of a given process,
1355 except the leader. */
1358 kill_one_lwp_callback (thread_info
*thread
, int pid
)
1360 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1362 /* We avoid killing the first thread here, because of a Linux kernel (at
1363 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1364 the children get a chance to be reaped, it will remain a zombie
1367 if (lwpid_of (thread
) == pid
)
1370 debug_printf ("lkop: is last of process %s\n",
1371 target_pid_to_str (thread
->id
));
1375 kill_wait_lwp (lwp
);
1379 linux_kill (int pid
)
1381 struct process_info
*process
;
1382 struct lwp_info
*lwp
;
1384 process
= find_process_pid (pid
);
1385 if (process
== NULL
)
1388 /* If we're killing a running inferior, make sure it is stopped
1389 first, as PTRACE_KILL will not work otherwise. */
1390 stop_all_lwps (0, NULL
);
1392 for_each_thread (pid
, [&] (thread_info
*thread
)
1394 kill_one_lwp_callback (thread
, pid
);
1397 /* See the comment in linux_kill_one_lwp. We did not kill the first
1398 thread in the list, so do so now. */
1399 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1404 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1408 kill_wait_lwp (lwp
);
1410 the_target
->mourn (process
);
1412 /* Since we presently can only stop all lwps of all processes, we
1413 need to unstop lwps of other processes. */
1414 unstop_all_lwps (0, NULL
);
1418 /* Get pending signal of THREAD, for detaching purposes. This is the
1419 signal the thread last stopped for, which we need to deliver to the
1420 thread when detaching, otherwise, it'd be suppressed/lost. */
1423 get_detach_signal (struct thread_info
*thread
)
1425 enum gdb_signal signo
= GDB_SIGNAL_0
;
1427 struct lwp_info
*lp
= get_thread_lwp (thread
);
1429 if (lp
->status_pending_p
)
1430 status
= lp
->status_pending
;
1433 /* If the thread had been suspended by gdbserver, and it stopped
1434 cleanly, then it'll have stopped with SIGSTOP. But we don't
1435 want to deliver that SIGSTOP. */
1436 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1437 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1440 /* Otherwise, we may need to deliver the signal we
1442 status
= lp
->last_status
;
1445 if (!WIFSTOPPED (status
))
1448 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1449 target_pid_to_str (ptid_of (thread
)));
1453 /* Extended wait statuses aren't real SIGTRAPs. */
1454 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1457 debug_printf ("GPS: lwp %s had stopped with extended "
1458 "status: no pending signal\n",
1459 target_pid_to_str (ptid_of (thread
)));
1463 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1465 if (program_signals_p
&& !program_signals
[signo
])
1468 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1469 target_pid_to_str (ptid_of (thread
)),
1470 gdb_signal_to_string (signo
));
1473 else if (!program_signals_p
1474 /* If we have no way to know which signals GDB does not
1475 want to have passed to the program, assume
1476 SIGTRAP/SIGINT, which is GDB's default. */
1477 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1480 debug_printf ("GPS: lwp %s had signal %s, "
1481 "but we don't know if we should pass it. "
1482 "Default to not.\n",
1483 target_pid_to_str (ptid_of (thread
)),
1484 gdb_signal_to_string (signo
));
1490 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1491 target_pid_to_str (ptid_of (thread
)),
1492 gdb_signal_to_string (signo
));
1494 return WSTOPSIG (status
);
1498 /* Detach from LWP. */
1501 linux_detach_one_lwp (struct lwp_info
*lwp
)
1503 struct thread_info
*thread
= get_lwp_thread (lwp
);
1507 /* If there is a pending SIGSTOP, get rid of it. */
1508 if (lwp
->stop_expected
)
1511 debug_printf ("Sending SIGCONT to %s\n",
1512 target_pid_to_str (ptid_of (thread
)));
1514 kill_lwp (lwpid_of (thread
), SIGCONT
);
1515 lwp
->stop_expected
= 0;
1518 /* Pass on any pending signal for this thread. */
1519 sig
= get_detach_signal (thread
);
1521 /* Preparing to resume may try to write registers, and fail if the
1522 lwp is zombie. If that happens, ignore the error. We'll handle
1523 it below, when detach fails with ESRCH. */
1526 /* Flush any pending changes to the process's registers. */
1527 regcache_invalidate_thread (thread
);
1529 /* Finally, let it resume. */
1530 if (the_low_target
.prepare_to_resume
!= NULL
)
1531 the_low_target
.prepare_to_resume (lwp
);
1533 CATCH (ex
, RETURN_MASK_ERROR
)
1535 if (!check_ptrace_stopped_lwp_gone (lwp
))
1536 throw_exception (ex
);
1540 lwpid
= lwpid_of (thread
);
1541 if (ptrace (PTRACE_DETACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0,
1542 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1544 int save_errno
= errno
;
1546 /* We know the thread exists, so ESRCH must mean the lwp is
1547 zombie. This can happen if one of the already-detached
1548 threads exits the whole thread group. In that case we're
1549 still attached, and must reap the lwp. */
1550 if (save_errno
== ESRCH
)
1554 ret
= my_waitpid (lwpid
, &status
, __WALL
);
1557 warning (_("Couldn't reap LWP %d while detaching: %s"),
1558 lwpid
, strerror (errno
));
1560 else if (!WIFEXITED (status
) && !WIFSIGNALED (status
))
1562 warning (_("Reaping LWP %d while detaching "
1563 "returned unexpected status 0x%x"),
1569 error (_("Can't detach %s: %s"),
1570 target_pid_to_str (ptid_of (thread
)),
1571 strerror (save_errno
));
1574 else if (debug_threads
)
1576 debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n",
1577 target_pid_to_str (ptid_of (thread
)),
1584 /* Callback for for_each_thread. Detaches from non-leader threads of a
1588 linux_detach_lwp_callback (thread_info
*thread
)
1590 /* We don't actually detach from the thread group leader just yet.
1591 If the thread group exits, we must reap the zombie clone lwps
1592 before we're able to reap the leader. */
1593 if (thread
->id
.pid () == thread
->id
.lwp ())
1596 lwp_info
*lwp
= get_thread_lwp (thread
);
1597 linux_detach_one_lwp (lwp
);
1601 linux_detach (int pid
)
1603 struct process_info
*process
;
1604 struct lwp_info
*main_lwp
;
1606 process
= find_process_pid (pid
);
1607 if (process
== NULL
)
1610 /* As there's a step over already in progress, let it finish first,
1611 otherwise nesting a stabilize_threads operation on top gets real
1613 complete_ongoing_step_over ();
1615 /* Stop all threads before detaching. First, ptrace requires that
1616 the thread is stopped to sucessfully detach. Second, thread_db
1617 may need to uninstall thread event breakpoints from memory, which
1618 only works with a stopped process anyway. */
1619 stop_all_lwps (0, NULL
);
1621 #ifdef USE_THREAD_DB
1622 thread_db_detach (process
);
1625 /* Stabilize threads (move out of jump pads). */
1626 stabilize_threads ();
1628 /* Detach from the clone lwps first. If the thread group exits just
1629 while we're detaching, we must reap the clone lwps before we're
1630 able to reap the leader. */
1631 for_each_thread (pid
, linux_detach_lwp_callback
);
1633 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1634 linux_detach_one_lwp (main_lwp
);
1636 the_target
->mourn (process
);
1638 /* Since we presently can only stop all lwps of all processes, we
1639 need to unstop lwps of other processes. */
1640 unstop_all_lwps (0, NULL
);
1644 /* Remove all LWPs that belong to process PROC from the lwp list. */
1647 delete_lwp_callback (thread_info
*thread
, void *proc
)
1649 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1650 struct process_info
*process
= (struct process_info
*) proc
;
1652 if (pid_of (thread
) == pid_of (process
))
1659 linux_mourn (struct process_info
*process
)
1661 struct process_info_private
*priv
;
1663 #ifdef USE_THREAD_DB
1664 thread_db_mourn (process
);
1667 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1669 /* Freeing all private data. */
1670 priv
= process
->priv
;
1671 if (the_low_target
.delete_process
!= NULL
)
1672 the_low_target
.delete_process (priv
->arch_private
);
1674 gdb_assert (priv
->arch_private
== NULL
);
1676 process
->priv
= NULL
;
1678 remove_process (process
);
1682 linux_join (int pid
)
1687 ret
= my_waitpid (pid
, &status
, 0);
1688 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1690 } while (ret
!= -1 || errno
!= ECHILD
);
1693 /* Return nonzero if the given thread is still alive. */
1695 linux_thread_alive (ptid_t ptid
)
1697 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1699 /* We assume we always know if a thread exits. If a whole process
1700 exited but we still haven't been able to report it to GDB, we'll
1701 hold on to the last lwp of the dead process. */
1703 return !lwp_is_marked_dead (lwp
);
1708 /* Return 1 if this lwp still has an interesting status pending. If
1709 not (e.g., it had stopped for a breakpoint that is gone), return
1713 thread_still_has_status_pending_p (struct thread_info
*thread
)
1715 struct lwp_info
*lp
= get_thread_lwp (thread
);
1717 if (!lp
->status_pending_p
)
1720 if (thread
->last_resume_kind
!= resume_stop
1721 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1722 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1724 struct thread_info
*saved_thread
;
1728 gdb_assert (lp
->last_status
!= 0);
1732 saved_thread
= current_thread
;
1733 current_thread
= thread
;
1735 if (pc
!= lp
->stop_pc
)
1738 debug_printf ("PC of %ld changed\n",
1743 #if !USE_SIGTRAP_SIGINFO
1744 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1745 && !(*the_low_target
.breakpoint_at
) (pc
))
1748 debug_printf ("previous SW breakpoint of %ld gone\n",
1752 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1753 && !hardware_breakpoint_inserted_here (pc
))
1756 debug_printf ("previous HW breakpoint of %ld gone\n",
1762 current_thread
= saved_thread
;
1767 debug_printf ("discarding pending breakpoint status\n");
1768 lp
->status_pending_p
= 0;
1776 /* Returns true if LWP is resumed from the client's perspective. */
1779 lwp_resumed (struct lwp_info
*lwp
)
1781 struct thread_info
*thread
= get_lwp_thread (lwp
);
1783 if (thread
->last_resume_kind
!= resume_stop
)
1786 /* Did gdb send us a `vCont;t', but we haven't reported the
1787 corresponding stop to gdb yet? If so, the thread is still
1788 resumed/running from gdb's perspective. */
1789 if (thread
->last_resume_kind
== resume_stop
1790 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1796 /* Return true if this lwp has an interesting status pending. */
1798 status_pending_p_callback (thread_info
*thread
, ptid_t ptid
)
1800 struct lwp_info
*lp
= get_thread_lwp (thread
);
1802 /* Check if we're only interested in events from a specific process
1803 or a specific LWP. */
1804 if (!thread
->id
.matches (ptid
))
1807 if (!lwp_resumed (lp
))
1810 if (lp
->status_pending_p
1811 && !thread_still_has_status_pending_p (thread
))
1813 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1817 return lp
->status_pending_p
;
1821 same_lwp (thread_info
*thread
, void *data
)
1823 ptid_t ptid
= *(ptid_t
*) data
;
1826 if (ptid_get_lwp (ptid
) != 0)
1827 lwp
= ptid_get_lwp (ptid
);
1829 lwp
= ptid_get_pid (ptid
);
1831 if (thread
->id
.lwp () == lwp
)
1838 find_lwp_pid (ptid_t ptid
)
1840 thread_info
*thread
= find_inferior (&all_threads
, same_lwp
, &ptid
);
1845 return get_thread_lwp (thread
);
1848 /* Return the number of known LWPs in the tgid given by PID. */
1855 for_each_thread (pid
, [&] (thread_info
*thread
)
1863 /* See nat/linux-nat.h. */
1866 iterate_over_lwps (ptid_t filter
,
1867 iterate_over_lwps_ftype callback
,
1870 thread_info
*thread
= find_thread (filter
, [&] (thread_info
*thread
)
1872 lwp_info
*lwp
= get_thread_lwp (thread
);
1874 return callback (lwp
, data
);
1880 return get_thread_lwp (thread
);
1883 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1884 their exits until all other threads in the group have exited. */
1887 check_zombie_leaders (void)
1889 for_each_process ([] (process_info
*proc
) {
1890 pid_t leader_pid
= pid_of (proc
);
1891 struct lwp_info
*leader_lp
;
1893 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1896 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1897 "num_lwps=%d, zombie=%d\n",
1898 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1899 linux_proc_pid_is_zombie (leader_pid
));
1901 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1902 /* Check if there are other threads in the group, as we may
1903 have raced with the inferior simply exiting. */
1904 && !last_thread_of_process_p (leader_pid
)
1905 && linux_proc_pid_is_zombie (leader_pid
))
1907 /* A leader zombie can mean one of two things:
1909 - It exited, and there's an exit status pending
1910 available, or only the leader exited (not the whole
1911 program). In the latter case, we can't waitpid the
1912 leader's exit status until all other threads are gone.
1914 - There are 3 or more threads in the group, and a thread
1915 other than the leader exec'd. On an exec, the Linux
1916 kernel destroys all other threads (except the execing
1917 one) in the thread group, and resets the execing thread's
1918 tid to the tgid. No exit notification is sent for the
1919 execing thread -- from the ptracer's perspective, it
1920 appears as though the execing thread just vanishes.
1921 Until we reap all other threads except the leader and the
1922 execing thread, the leader will be zombie, and the
1923 execing thread will be in `D (disc sleep)'. As soon as
1924 all other threads are reaped, the execing thread changes
1925 it's tid to the tgid, and the previous (zombie) leader
1926 vanishes, giving place to the "new" leader. We could try
1927 distinguishing the exit and exec cases, by waiting once
1928 more, and seeing if something comes out, but it doesn't
1929 sound useful. The previous leader _does_ go away, and
1930 we'll re-add the new one once we see the exec event
1931 (which is just the same as what would happen if the
1932 previous leader did exit voluntarily before some other
1936 debug_printf ("CZL: Thread group leader %d zombie "
1937 "(it exited, or another thread execd).\n",
1940 delete_lwp (leader_lp
);
1945 /* Callback for `find_inferior'. Returns the first LWP that is not
1946 stopped. ARG is a PTID filter. */
1949 not_stopped_callback (thread_info
*thread
, void *arg
)
1951 struct lwp_info
*lwp
;
1952 ptid_t filter
= *(ptid_t
*) arg
;
1954 if (!ptid_match (ptid_of (thread
), filter
))
1957 lwp
= get_thread_lwp (thread
);
1964 /* Increment LWP's suspend count. */
1967 lwp_suspended_inc (struct lwp_info
*lwp
)
1971 if (debug_threads
&& lwp
->suspended
> 4)
1973 struct thread_info
*thread
= get_lwp_thread (lwp
);
1975 debug_printf ("LWP %ld has a suspiciously high suspend count,"
1976 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
1980 /* Decrement LWP's suspend count. */
1983 lwp_suspended_decr (struct lwp_info
*lwp
)
1987 if (lwp
->suspended
< 0)
1989 struct thread_info
*thread
= get_lwp_thread (lwp
);
1991 internal_error (__FILE__
, __LINE__
,
1992 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
1997 /* This function should only be called if the LWP got a SIGTRAP.
1999 Handle any tracepoint steps or hits. Return true if a tracepoint
2000 event was handled, 0 otherwise. */
2003 handle_tracepoints (struct lwp_info
*lwp
)
2005 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
2006 int tpoint_related_event
= 0;
2008 gdb_assert (lwp
->suspended
== 0);
2010 /* If this tracepoint hit causes a tracing stop, we'll immediately
2011 uninsert tracepoints. To do this, we temporarily pause all
2012 threads, unpatch away, and then unpause threads. We need to make
2013 sure the unpausing doesn't resume LWP too. */
2014 lwp_suspended_inc (lwp
);
2016 /* And we need to be sure that any all-threads-stopping doesn't try
2017 to move threads out of the jump pads, as it could deadlock the
2018 inferior (LWP could be in the jump pad, maybe even holding the
2021 /* Do any necessary step collect actions. */
2022 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2024 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2026 /* See if we just hit a tracepoint and do its main collect
2028 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2030 lwp_suspended_decr (lwp
);
2032 gdb_assert (lwp
->suspended
== 0);
2033 gdb_assert (!stabilizing_threads
2034 || (lwp
->collecting_fast_tracepoint
2035 != fast_tpoint_collect_result::not_collecting
));
2037 if (tpoint_related_event
)
2040 debug_printf ("got a tracepoint event\n");
2047 /* Convenience wrapper. Returns information about LWP's fast tracepoint
2048 collection status. */
2050 static fast_tpoint_collect_result
2051 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2052 struct fast_tpoint_collect_status
*status
)
2054 CORE_ADDR thread_area
;
2055 struct thread_info
*thread
= get_lwp_thread (lwp
);
2057 if (the_low_target
.get_thread_area
== NULL
)
2058 return fast_tpoint_collect_result::not_collecting
;
2060 /* Get the thread area address. This is used to recognize which
2061 thread is which when tracing with the in-process agent library.
2062 We don't read anything from the address, and treat it as opaque;
2063 it's the address itself that we assume is unique per-thread. */
2064 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2065 return fast_tpoint_collect_result::not_collecting
;
2067 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2070 /* The reason we resume in the caller, is because we want to be able
2071 to pass lwp->status_pending as WSTAT, and we need to clear
2072 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2073 refuses to resume. */
2076 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2078 struct thread_info
*saved_thread
;
2080 saved_thread
= current_thread
;
2081 current_thread
= get_lwp_thread (lwp
);
2084 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2085 && supports_fast_tracepoints ()
2086 && agent_loaded_p ())
2088 struct fast_tpoint_collect_status status
;
2091 debug_printf ("Checking whether LWP %ld needs to move out of the "
2093 lwpid_of (current_thread
));
2095 fast_tpoint_collect_result r
2096 = linux_fast_tracepoint_collecting (lwp
, &status
);
2099 || (WSTOPSIG (*wstat
) != SIGILL
2100 && WSTOPSIG (*wstat
) != SIGFPE
2101 && WSTOPSIG (*wstat
) != SIGSEGV
2102 && WSTOPSIG (*wstat
) != SIGBUS
))
2104 lwp
->collecting_fast_tracepoint
= r
;
2106 if (r
!= fast_tpoint_collect_result::not_collecting
)
2108 if (r
== fast_tpoint_collect_result::before_insn
2109 && lwp
->exit_jump_pad_bkpt
== NULL
)
2111 /* Haven't executed the original instruction yet.
2112 Set breakpoint there, and wait till it's hit,
2113 then single-step until exiting the jump pad. */
2114 lwp
->exit_jump_pad_bkpt
2115 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2119 debug_printf ("Checking whether LWP %ld needs to move out of "
2120 "the jump pad...it does\n",
2121 lwpid_of (current_thread
));
2122 current_thread
= saved_thread
;
2129 /* If we get a synchronous signal while collecting, *and*
2130 while executing the (relocated) original instruction,
2131 reset the PC to point at the tpoint address, before
2132 reporting to GDB. Otherwise, it's an IPA lib bug: just
2133 report the signal to GDB, and pray for the best. */
2135 lwp
->collecting_fast_tracepoint
2136 = fast_tpoint_collect_result::not_collecting
;
2138 if (r
!= fast_tpoint_collect_result::not_collecting
2139 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2140 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2143 struct regcache
*regcache
;
2145 /* The si_addr on a few signals references the address
2146 of the faulting instruction. Adjust that as
2148 if ((WSTOPSIG (*wstat
) == SIGILL
2149 || WSTOPSIG (*wstat
) == SIGFPE
2150 || WSTOPSIG (*wstat
) == SIGBUS
2151 || WSTOPSIG (*wstat
) == SIGSEGV
)
2152 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2153 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2154 /* Final check just to make sure we don't clobber
2155 the siginfo of non-kernel-sent signals. */
2156 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2158 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2159 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2160 (PTRACE_TYPE_ARG3
) 0, &info
);
2163 regcache
= get_thread_regcache (current_thread
, 1);
2164 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2165 lwp
->stop_pc
= status
.tpoint_addr
;
2167 /* Cancel any fast tracepoint lock this thread was
2169 force_unlock_trace_buffer ();
2172 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2175 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2176 "stopping all threads momentarily.\n");
2178 stop_all_lwps (1, lwp
);
2180 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2181 lwp
->exit_jump_pad_bkpt
= NULL
;
2183 unstop_all_lwps (1, lwp
);
2185 gdb_assert (lwp
->suspended
>= 0);
2191 debug_printf ("Checking whether LWP %ld needs to move out of the "
2193 lwpid_of (current_thread
));
2195 current_thread
= saved_thread
;
2199 /* Enqueue one signal in the "signals to report later when out of the
2203 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2205 struct pending_signals
*p_sig
;
2206 struct thread_info
*thread
= get_lwp_thread (lwp
);
2209 debug_printf ("Deferring signal %d for LWP %ld.\n",
2210 WSTOPSIG (*wstat
), lwpid_of (thread
));
2214 struct pending_signals
*sig
;
2216 for (sig
= lwp
->pending_signals_to_report
;
2219 debug_printf (" Already queued %d\n",
2222 debug_printf (" (no more currently queued signals)\n");
2225 /* Don't enqueue non-RT signals if they are already in the deferred
2226 queue. (SIGSTOP being the easiest signal to see ending up here
2228 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2230 struct pending_signals
*sig
;
2232 for (sig
= lwp
->pending_signals_to_report
;
2236 if (sig
->signal
== WSTOPSIG (*wstat
))
2239 debug_printf ("Not requeuing already queued non-RT signal %d"
2248 p_sig
= XCNEW (struct pending_signals
);
2249 p_sig
->prev
= lwp
->pending_signals_to_report
;
2250 p_sig
->signal
= WSTOPSIG (*wstat
);
2252 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2255 lwp
->pending_signals_to_report
= p_sig
;
2258 /* Dequeue one signal from the "signals to report later when out of
2259 the jump pad" list. */
2262 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2264 struct thread_info
*thread
= get_lwp_thread (lwp
);
2266 if (lwp
->pending_signals_to_report
!= NULL
)
2268 struct pending_signals
**p_sig
;
2270 p_sig
= &lwp
->pending_signals_to_report
;
2271 while ((*p_sig
)->prev
!= NULL
)
2272 p_sig
= &(*p_sig
)->prev
;
2274 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2275 if ((*p_sig
)->info
.si_signo
!= 0)
2276 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2282 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2283 WSTOPSIG (*wstat
), lwpid_of (thread
));
2287 struct pending_signals
*sig
;
2289 for (sig
= lwp
->pending_signals_to_report
;
2292 debug_printf (" Still queued %d\n",
2295 debug_printf (" (no more queued signals)\n");
2304 /* Fetch the possibly triggered data watchpoint info and store it in
2307 On some archs, like x86, that use debug registers to set
2308 watchpoints, it's possible that the way to know which watched
2309 address trapped, is to check the register that is used to select
2310 which address to watch. Problem is, between setting the watchpoint
2311 and reading back which data address trapped, the user may change
2312 the set of watchpoints, and, as a consequence, GDB changes the
2313 debug registers in the inferior. To avoid reading back a stale
2314 stopped-data-address when that happens, we cache in LP the fact
2315 that a watchpoint trapped, and the corresponding data address, as
2316 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2317 registers meanwhile, we have the cached data we can rely on. */
2320 check_stopped_by_watchpoint (struct lwp_info
*child
)
2322 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2324 struct thread_info
*saved_thread
;
2326 saved_thread
= current_thread
;
2327 current_thread
= get_lwp_thread (child
);
2329 if (the_low_target
.stopped_by_watchpoint ())
2331 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2333 if (the_low_target
.stopped_data_address
!= NULL
)
2334 child
->stopped_data_address
2335 = the_low_target
.stopped_data_address ();
2337 child
->stopped_data_address
= 0;
2340 current_thread
= saved_thread
;
2343 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2346 /* Return the ptrace options that we want to try to enable. */
2349 linux_low_ptrace_options (int attached
)
2354 options
|= PTRACE_O_EXITKILL
;
2356 if (report_fork_events
)
2357 options
|= PTRACE_O_TRACEFORK
;
2359 if (report_vfork_events
)
2360 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2362 if (report_exec_events
)
2363 options
|= PTRACE_O_TRACEEXEC
;
2365 options
|= PTRACE_O_TRACESYSGOOD
;
2370 /* Do low-level handling of the event, and check if we should go on
2371 and pass it to caller code. Return the affected lwp if we are, or
2374 static struct lwp_info
*
2375 linux_low_filter_event (int lwpid
, int wstat
)
2377 struct lwp_info
*child
;
2378 struct thread_info
*thread
;
2379 int have_stop_pc
= 0;
2381 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2383 /* Check for stop events reported by a process we didn't already
2384 know about - anything not already in our LWP list.
2386 If we're expecting to receive stopped processes after
2387 fork, vfork, and clone events, then we'll just add the
2388 new one to our list and go back to waiting for the event
2389 to be reported - the stopped process might be returned
2390 from waitpid before or after the event is.
2392 But note the case of a non-leader thread exec'ing after the
2393 leader having exited, and gone from our lists (because
2394 check_zombie_leaders deleted it). The non-leader thread
2395 changes its tid to the tgid. */
2397 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2398 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2402 /* A multi-thread exec after we had seen the leader exiting. */
2405 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2406 "after exec.\n", lwpid
);
2409 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2410 child
= add_lwp (child_ptid
);
2412 current_thread
= child
->thread
;
2415 /* If we didn't find a process, one of two things presumably happened:
2416 - A process we started and then detached from has exited. Ignore it.
2417 - A process we are controlling has forked and the new child's stop
2418 was reported to us by the kernel. Save its PID. */
2419 if (child
== NULL
&& WIFSTOPPED (wstat
))
2421 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2424 else if (child
== NULL
)
2427 thread
= get_lwp_thread (child
);
2431 child
->last_status
= wstat
;
2433 /* Check if the thread has exited. */
2434 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2437 debug_printf ("LLFE: %d exited.\n", lwpid
);
2439 if (finish_step_over (child
))
2441 /* Unsuspend all other LWPs, and set them back running again. */
2442 unsuspend_all_lwps (child
);
2445 /* If there is at least one more LWP, then the exit signal was
2446 not the end of the debugged application and should be
2447 ignored, unless GDB wants to hear about thread exits. */
2448 if (report_thread_events
2449 || last_thread_of_process_p (pid_of (thread
)))
2451 /* Since events are serialized to GDB core, and we can't
2452 report this one right now. Leave the status pending for
2453 the next time we're able to report it. */
2454 mark_lwp_dead (child
, wstat
);
2464 gdb_assert (WIFSTOPPED (wstat
));
2466 if (WIFSTOPPED (wstat
))
2468 struct process_info
*proc
;
2470 /* Architecture-specific setup after inferior is running. */
2471 proc
= find_process_pid (pid_of (thread
));
2472 if (proc
->tdesc
== NULL
)
2476 /* This needs to happen after we have attached to the
2477 inferior and it is stopped for the first time, but
2478 before we access any inferior registers. */
2479 linux_arch_setup_thread (thread
);
2483 /* The process is started, but GDBserver will do
2484 architecture-specific setup after the program stops at
2485 the first instruction. */
2486 child
->status_pending_p
= 1;
2487 child
->status_pending
= wstat
;
2493 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2495 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2496 int options
= linux_low_ptrace_options (proc
->attached
);
2498 linux_enable_event_reporting (lwpid
, options
);
2499 child
->must_set_ptrace_flags
= 0;
2502 /* Always update syscall_state, even if it will be filtered later. */
2503 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2505 child
->syscall_state
2506 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2507 ? TARGET_WAITKIND_SYSCALL_RETURN
2508 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2512 /* Almost all other ptrace-stops are known to be outside of system
2513 calls, with further exceptions in handle_extended_wait. */
2514 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2517 /* Be careful to not overwrite stop_pc until save_stop_reason is
2519 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2520 && linux_is_extended_waitstatus (wstat
))
2522 child
->stop_pc
= get_pc (child
);
2523 if (handle_extended_wait (&child
, wstat
))
2525 /* The event has been handled, so just return without
2531 if (linux_wstatus_maybe_breakpoint (wstat
))
2533 if (save_stop_reason (child
))
2538 child
->stop_pc
= get_pc (child
);
2540 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2541 && child
->stop_expected
)
2544 debug_printf ("Expected stop.\n");
2545 child
->stop_expected
= 0;
2547 if (thread
->last_resume_kind
== resume_stop
)
2549 /* We want to report the stop to the core. Treat the
2550 SIGSTOP as a normal event. */
2552 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2553 target_pid_to_str (ptid_of (thread
)));
2555 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2557 /* Stopping threads. We don't want this SIGSTOP to end up
2560 debug_printf ("LLW: SIGSTOP caught for %s "
2561 "while stopping threads.\n",
2562 target_pid_to_str (ptid_of (thread
)));
2567 /* This is a delayed SIGSTOP. Filter out the event. */
2569 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2570 child
->stepping
? "step" : "continue",
2571 target_pid_to_str (ptid_of (thread
)));
2573 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2578 child
->status_pending_p
= 1;
2579 child
->status_pending
= wstat
;
2583 /* Return true if THREAD is doing hardware single step. */
2586 maybe_hw_step (struct thread_info
*thread
)
2588 if (can_hardware_single_step ())
2592 /* GDBserver must insert single-step breakpoint for software
2594 gdb_assert (has_single_step_breakpoints (thread
));
2599 /* Resume LWPs that are currently stopped without any pending status
2600 to report, but are resumed from the core's perspective. */
2603 resume_stopped_resumed_lwps (thread_info
*thread
)
2605 struct lwp_info
*lp
= get_thread_lwp (thread
);
2609 && !lp
->status_pending_p
2610 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2614 if (thread
->last_resume_kind
== resume_step
)
2615 step
= maybe_hw_step (thread
);
2618 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2619 target_pid_to_str (ptid_of (thread
)),
2620 paddress (lp
->stop_pc
),
2623 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2627 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2628 match FILTER_PTID (leaving others pending). The PTIDs can be:
2629 minus_one_ptid, to specify any child; a pid PTID, specifying all
2630 lwps of a thread group; or a PTID representing a single lwp. Store
2631 the stop status through the status pointer WSTAT. OPTIONS is
2632 passed to the waitpid call. Return 0 if no event was found and
2633 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2634 was found. Return the PID of the stopped child otherwise. */
2637 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2638 int *wstatp
, int options
)
2640 struct thread_info
*event_thread
;
2641 struct lwp_info
*event_child
, *requested_child
;
2642 sigset_t block_mask
, prev_mask
;
2645 /* N.B. event_thread points to the thread_info struct that contains
2646 event_child. Keep them in sync. */
2647 event_thread
= NULL
;
2649 requested_child
= NULL
;
2651 /* Check for a lwp with a pending status. */
2653 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2655 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2657 return status_pending_p_callback (thread
, filter_ptid
);
2660 if (event_thread
!= NULL
)
2661 event_child
= get_thread_lwp (event_thread
);
2662 if (debug_threads
&& event_thread
)
2663 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2665 else if (!ptid_equal (filter_ptid
, null_ptid
))
2667 requested_child
= find_lwp_pid (filter_ptid
);
2669 if (stopping_threads
== NOT_STOPPING_THREADS
2670 && requested_child
->status_pending_p
2671 && (requested_child
->collecting_fast_tracepoint
2672 != fast_tpoint_collect_result::not_collecting
))
2674 enqueue_one_deferred_signal (requested_child
,
2675 &requested_child
->status_pending
);
2676 requested_child
->status_pending_p
= 0;
2677 requested_child
->status_pending
= 0;
2678 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2681 if (requested_child
->suspended
2682 && requested_child
->status_pending_p
)
2684 internal_error (__FILE__
, __LINE__
,
2685 "requesting an event out of a"
2686 " suspended child?");
2689 if (requested_child
->status_pending_p
)
2691 event_child
= requested_child
;
2692 event_thread
= get_lwp_thread (event_child
);
2696 if (event_child
!= NULL
)
2699 debug_printf ("Got an event from pending child %ld (%04x)\n",
2700 lwpid_of (event_thread
), event_child
->status_pending
);
2701 *wstatp
= event_child
->status_pending
;
2702 event_child
->status_pending_p
= 0;
2703 event_child
->status_pending
= 0;
2704 current_thread
= event_thread
;
2705 return lwpid_of (event_thread
);
2708 /* But if we don't find a pending event, we'll have to wait.
2710 We only enter this loop if no process has a pending wait status.
2711 Thus any action taken in response to a wait status inside this
2712 loop is responding as soon as we detect the status, not after any
2715 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2716 all signals while here. */
2717 sigfillset (&block_mask
);
2718 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2720 /* Always pull all events out of the kernel. We'll randomly select
2721 an event LWP out of all that have events, to prevent
2723 while (event_child
== NULL
)
2727 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2730 - If the thread group leader exits while other threads in the
2731 thread group still exist, waitpid(TGID, ...) hangs. That
2732 waitpid won't return an exit status until the other threads
2733 in the group are reaped.
2735 - When a non-leader thread execs, that thread just vanishes
2736 without reporting an exit (so we'd hang if we waited for it
2737 explicitly in that case). The exec event is reported to
2740 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2743 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2744 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2750 debug_printf ("LLW: waitpid %ld received %s\n",
2751 (long) ret
, status_to_str (*wstatp
));
2754 /* Filter all events. IOW, leave all events pending. We'll
2755 randomly select an event LWP out of all that have events
2757 linux_low_filter_event (ret
, *wstatp
);
2758 /* Retry until nothing comes out of waitpid. A single
2759 SIGCHLD can indicate more than one child stopped. */
2763 /* Now that we've pulled all events out of the kernel, resume
2764 LWPs that don't have an interesting event to report. */
2765 if (stopping_threads
== NOT_STOPPING_THREADS
)
2766 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2768 /* ... and find an LWP with a status to report to the core, if
2770 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2772 return status_pending_p_callback (thread
, filter_ptid
);
2775 if (event_thread
!= NULL
)
2777 event_child
= get_thread_lwp (event_thread
);
2778 *wstatp
= event_child
->status_pending
;
2779 event_child
->status_pending_p
= 0;
2780 event_child
->status_pending
= 0;
2784 /* Check for zombie thread group leaders. Those can't be reaped
2785 until all other threads in the thread group are. */
2786 check_zombie_leaders ();
2788 /* If there are no resumed children left in the set of LWPs we
2789 want to wait for, bail. We can't just block in
2790 waitpid/sigsuspend, because lwps might have been left stopped
2791 in trace-stop state, and we'd be stuck forever waiting for
2792 their status to change (which would only happen if we resumed
2793 them). Even if WNOHANG is set, this return code is preferred
2794 over 0 (below), as it is more detailed. */
2795 if ((find_inferior (&all_threads
,
2796 not_stopped_callback
,
2797 &wait_ptid
) == NULL
))
2800 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2801 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2805 /* No interesting event to report to the caller. */
2806 if ((options
& WNOHANG
))
2809 debug_printf ("WNOHANG set, no event found\n");
2811 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2815 /* Block until we get an event reported with SIGCHLD. */
2817 debug_printf ("sigsuspend'ing\n");
2819 sigsuspend (&prev_mask
);
2820 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2824 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2826 current_thread
= event_thread
;
2828 return lwpid_of (event_thread
);
2831 /* Wait for an event from child(ren) PTID. PTIDs can be:
2832 minus_one_ptid, to specify any child; a pid PTID, specifying all
2833 lwps of a thread group; or a PTID representing a single lwp. Store
2834 the stop status through the status pointer WSTAT. OPTIONS is
2835 passed to the waitpid call. Return 0 if no event was found and
2836 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2837 was found. Return the PID of the stopped child otherwise. */
2840 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2842 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2845 /* Count the LWP's that have had events. */
2848 count_events_callback (thread_info
*thread
, void *data
)
2850 struct lwp_info
*lp
= get_thread_lwp (thread
);
2851 int *count
= (int *) data
;
2853 gdb_assert (count
!= NULL
);
2855 /* Count only resumed LWPs that have an event pending. */
2856 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2857 && lp
->status_pending_p
)
2863 /* Select the LWP (if any) that is currently being single-stepped. */
2866 select_singlestep_lwp_callback (thread_info
*thread
, void *data
)
2868 struct lwp_info
*lp
= get_thread_lwp (thread
);
2870 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2871 && thread
->last_resume_kind
== resume_step
2872 && lp
->status_pending_p
)
2878 /* Select the Nth LWP that has had an event. */
2881 select_event_lwp_callback (thread_info
*thread
, void *data
)
2883 struct lwp_info
*lp
= get_thread_lwp (thread
);
2884 int *selector
= (int *) data
;
2886 gdb_assert (selector
!= NULL
);
2888 /* Select only resumed LWPs that have an event pending. */
2889 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2890 && lp
->status_pending_p
)
2891 if ((*selector
)-- == 0)
2897 /* Select one LWP out of those that have events pending. */
2900 select_event_lwp (struct lwp_info
**orig_lp
)
2903 int random_selector
;
2904 struct thread_info
*event_thread
= NULL
;
2906 /* In all-stop, give preference to the LWP that is being
2907 single-stepped. There will be at most one, and it's the LWP that
2908 the core is most interested in. If we didn't do this, then we'd
2909 have to handle pending step SIGTRAPs somehow in case the core
2910 later continues the previously-stepped thread, otherwise we'd
2911 report the pending SIGTRAP, and the core, not having stepped the
2912 thread, wouldn't understand what the trap was for, and therefore
2913 would report it to the user as a random signal. */
2917 = (struct thread_info
*) find_inferior (&all_threads
,
2918 select_singlestep_lwp_callback
,
2920 if (event_thread
!= NULL
)
2923 debug_printf ("SEL: Select single-step %s\n",
2924 target_pid_to_str (ptid_of (event_thread
)));
2927 if (event_thread
== NULL
)
2929 /* No single-stepping LWP. Select one at random, out of those
2930 which have had events. */
2932 /* First see how many events we have. */
2933 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2934 gdb_assert (num_events
> 0);
2936 /* Now randomly pick a LWP out of those that have had
2938 random_selector
= (int)
2939 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2941 if (debug_threads
&& num_events
> 1)
2942 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2943 num_events
, random_selector
);
2946 = (struct thread_info
*) find_inferior (&all_threads
,
2947 select_event_lwp_callback
,
2951 if (event_thread
!= NULL
)
2953 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2955 /* Switch the event LWP. */
2956 *orig_lp
= event_lp
;
2960 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2964 unsuspend_all_lwps (struct lwp_info
*except
)
2966 for_each_thread ([&] (thread_info
*thread
)
2968 lwp_info
*lwp
= get_thread_lwp (thread
);
2971 lwp_suspended_decr (lwp
);
2975 static void move_out_of_jump_pad_callback (thread_info
*thread
);
2976 static bool stuck_in_jump_pad_callback (thread_info
*thread
);
2977 static int lwp_running (thread_info
*thread
, void *data
);
2978 static ptid_t
linux_wait_1 (ptid_t ptid
,
2979 struct target_waitstatus
*ourstatus
,
2980 int target_options
);
2982 /* Stabilize threads (move out of jump pads).
2984 If a thread is midway collecting a fast tracepoint, we need to
2985 finish the collection and move it out of the jump pad before
2986 reporting the signal.
2988 This avoids recursion while collecting (when a signal arrives
2989 midway, and the signal handler itself collects), which would trash
2990 the trace buffer. In case the user set a breakpoint in a signal
2991 handler, this avoids the backtrace showing the jump pad, etc..
2992 Most importantly, there are certain things we can't do safely if
2993 threads are stopped in a jump pad (or in its callee's). For
2996 - starting a new trace run. A thread still collecting the
2997 previous run, could trash the trace buffer when resumed. The trace
2998 buffer control structures would have been reset but the thread had
2999 no way to tell. The thread could even midway memcpy'ing to the
3000 buffer, which would mean that when resumed, it would clobber the
3001 trace buffer that had been set for a new run.
3003 - we can't rewrite/reuse the jump pads for new tracepoints
3004 safely. Say you do tstart while a thread is stopped midway while
3005 collecting. When the thread is later resumed, it finishes the
3006 collection, and returns to the jump pad, to execute the original
3007 instruction that was under the tracepoint jump at the time the
3008 older run had been started. If the jump pad had been rewritten
3009 since for something else in the new run, the thread would now
3010 execute the wrong / random instructions. */
3013 linux_stabilize_threads (void)
3015 thread_info
*thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
3017 if (thread_stuck
!= NULL
)
3020 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
3021 lwpid_of (thread_stuck
));
3025 thread_info
*saved_thread
= current_thread
;
3027 stabilizing_threads
= 1;
3030 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
3032 /* Loop until all are stopped out of the jump pads. */
3033 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
3035 struct target_waitstatus ourstatus
;
3036 struct lwp_info
*lwp
;
3039 /* Note that we go through the full wait even loop. While
3040 moving threads out of jump pad, we need to be able to step
3041 over internal breakpoints and such. */
3042 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
3044 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
3046 lwp
= get_thread_lwp (current_thread
);
3049 lwp_suspended_inc (lwp
);
3051 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3052 || current_thread
->last_resume_kind
== resume_stop
)
3054 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3055 enqueue_one_deferred_signal (lwp
, &wstat
);
3060 unsuspend_all_lwps (NULL
);
3062 stabilizing_threads
= 0;
3064 current_thread
= saved_thread
;
3068 thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
3070 if (thread_stuck
!= NULL
)
3071 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3072 lwpid_of (thread_stuck
));
3076 /* Convenience function that is called when the kernel reports an
3077 event that is not passed out to GDB. */
3080 ignore_event (struct target_waitstatus
*ourstatus
)
3082 /* If we got an event, there may still be others, as a single
3083 SIGCHLD can indicate more than one child stopped. This forces
3084 another target_wait call. */
3087 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3091 /* Convenience function that is called when the kernel reports an exit
3092 event. This decides whether to report the event to GDB as a
3093 process exit event, a thread exit event, or to suppress the
3097 filter_exit_event (struct lwp_info
*event_child
,
3098 struct target_waitstatus
*ourstatus
)
3100 struct thread_info
*thread
= get_lwp_thread (event_child
);
3101 ptid_t ptid
= ptid_of (thread
);
3103 if (!last_thread_of_process_p (pid_of (thread
)))
3105 if (report_thread_events
)
3106 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3108 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3110 delete_lwp (event_child
);
3115 /* Returns 1 if GDB is interested in any event_child syscalls. */
3118 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3120 struct thread_info
*thread
= get_lwp_thread (event_child
);
3121 struct process_info
*proc
= get_thread_process (thread
);
3123 return !proc
->syscalls_to_catch
.empty ();
3126 /* Returns 1 if GDB is interested in the event_child syscall.
3127 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3130 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3133 struct thread_info
*thread
= get_lwp_thread (event_child
);
3134 struct process_info
*proc
= get_thread_process (thread
);
3136 if (proc
->syscalls_to_catch
.empty ())
3139 if (proc
->syscalls_to_catch
[0] == ANY_SYSCALL
)
3142 get_syscall_trapinfo (event_child
, &sysno
);
3144 for (int iter
: proc
->syscalls_to_catch
)
3151 /* Wait for process, returns status. */
3154 linux_wait_1 (ptid_t ptid
,
3155 struct target_waitstatus
*ourstatus
, int target_options
)
3158 struct lwp_info
*event_child
;
3161 int step_over_finished
;
3162 int bp_explains_trap
;
3163 int maybe_internal_trap
;
3172 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3175 /* Translate generic target options into linux options. */
3177 if (target_options
& TARGET_WNOHANG
)
3180 bp_explains_trap
= 0;
3183 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3185 auto status_pending_p_any
= [&] (thread_info
*thread
)
3187 return status_pending_p_callback (thread
, minus_one_ptid
);
3190 /* Find a resumed LWP, if any. */
3191 if (find_thread (status_pending_p_any
) != NULL
)
3193 else if ((find_inferior (&all_threads
,
3194 not_stopped_callback
,
3195 &minus_one_ptid
) != NULL
))
3200 if (ptid_equal (step_over_bkpt
, null_ptid
))
3201 pid
= linux_wait_for_event (ptid
, &w
, options
);
3205 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3206 target_pid_to_str (step_over_bkpt
));
3207 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3210 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3212 gdb_assert (target_options
& TARGET_WNOHANG
);
3216 debug_printf ("linux_wait_1 ret = null_ptid, "
3217 "TARGET_WAITKIND_IGNORE\n");
3221 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3228 debug_printf ("linux_wait_1 ret = null_ptid, "
3229 "TARGET_WAITKIND_NO_RESUMED\n");
3233 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3237 event_child
= get_thread_lwp (current_thread
);
3239 /* linux_wait_for_event only returns an exit status for the last
3240 child of a process. Report it. */
3241 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3245 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3246 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3250 debug_printf ("linux_wait_1 ret = %s, exited with "
3252 target_pid_to_str (ptid_of (current_thread
)),
3259 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3260 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3264 debug_printf ("linux_wait_1 ret = %s, terminated with "
3266 target_pid_to_str (ptid_of (current_thread
)),
3272 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3273 return filter_exit_event (event_child
, ourstatus
);
3275 return ptid_of (current_thread
);
3278 /* If step-over executes a breakpoint instruction, in the case of a
3279 hardware single step it means a gdb/gdbserver breakpoint had been
3280 planted on top of a permanent breakpoint, in the case of a software
3281 single step it may just mean that gdbserver hit the reinsert breakpoint.
3282 The PC has been adjusted by save_stop_reason to point at
3283 the breakpoint address.
3284 So in the case of the hardware single step advance the PC manually
3285 past the breakpoint and in the case of software single step advance only
3286 if it's not the single_step_breakpoint we are hitting.
3287 This avoids that a program would keep trapping a permanent breakpoint
3289 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3290 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3291 && (event_child
->stepping
3292 || !single_step_breakpoint_inserted_here (event_child
->stop_pc
)))
3294 int increment_pc
= 0;
3295 int breakpoint_kind
= 0;
3296 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3299 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3300 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3304 debug_printf ("step-over for %s executed software breakpoint\n",
3305 target_pid_to_str (ptid_of (current_thread
)));
3308 if (increment_pc
!= 0)
3310 struct regcache
*regcache
3311 = get_thread_regcache (current_thread
, 1);
3313 event_child
->stop_pc
+= increment_pc
;
3314 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3316 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3317 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3321 /* If this event was not handled before, and is not a SIGTRAP, we
3322 report it. SIGILL and SIGSEGV are also treated as traps in case
3323 a breakpoint is inserted at the current PC. If this target does
3324 not support internal breakpoints at all, we also report the
3325 SIGTRAP without further processing; it's of no concern to us. */
3327 = (supports_breakpoints ()
3328 && (WSTOPSIG (w
) == SIGTRAP
3329 || ((WSTOPSIG (w
) == SIGILL
3330 || WSTOPSIG (w
) == SIGSEGV
)
3331 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3333 if (maybe_internal_trap
)
3335 /* Handle anything that requires bookkeeping before deciding to
3336 report the event or continue waiting. */
3338 /* First check if we can explain the SIGTRAP with an internal
3339 breakpoint, or if we should possibly report the event to GDB.
3340 Do this before anything that may remove or insert a
3342 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3344 /* We have a SIGTRAP, possibly a step-over dance has just
3345 finished. If so, tweak the state machine accordingly,
3346 reinsert breakpoints and delete any single-step
3348 step_over_finished
= finish_step_over (event_child
);
3350 /* Now invoke the callbacks of any internal breakpoints there. */
3351 check_breakpoints (event_child
->stop_pc
);
3353 /* Handle tracepoint data collecting. This may overflow the
3354 trace buffer, and cause a tracing stop, removing
3356 trace_event
= handle_tracepoints (event_child
);
3358 if (bp_explains_trap
)
3361 debug_printf ("Hit a gdbserver breakpoint.\n");
3366 /* We have some other signal, possibly a step-over dance was in
3367 progress, and it should be cancelled too. */
3368 step_over_finished
= finish_step_over (event_child
);
3371 /* We have all the data we need. Either report the event to GDB, or
3372 resume threads and keep waiting for more. */
3374 /* If we're collecting a fast tracepoint, finish the collection and
3375 move out of the jump pad before delivering a signal. See
3376 linux_stabilize_threads. */
3379 && WSTOPSIG (w
) != SIGTRAP
3380 && supports_fast_tracepoints ()
3381 && agent_loaded_p ())
3384 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3385 "to defer or adjust it.\n",
3386 WSTOPSIG (w
), lwpid_of (current_thread
));
3388 /* Allow debugging the jump pad itself. */
3389 if (current_thread
->last_resume_kind
!= resume_step
3390 && maybe_move_out_of_jump_pad (event_child
, &w
))
3392 enqueue_one_deferred_signal (event_child
, &w
);
3395 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3396 WSTOPSIG (w
), lwpid_of (current_thread
));
3398 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3402 return ignore_event (ourstatus
);
3406 if (event_child
->collecting_fast_tracepoint
3407 != fast_tpoint_collect_result::not_collecting
)
3410 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3411 "Check if we're already there.\n",
3412 lwpid_of (current_thread
),
3413 (int) event_child
->collecting_fast_tracepoint
);
3417 event_child
->collecting_fast_tracepoint
3418 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3420 if (event_child
->collecting_fast_tracepoint
3421 != fast_tpoint_collect_result::before_insn
)
3423 /* No longer need this breakpoint. */
3424 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3427 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3428 "stopping all threads momentarily.\n");
3430 /* Other running threads could hit this breakpoint.
3431 We don't handle moribund locations like GDB does,
3432 instead we always pause all threads when removing
3433 breakpoints, so that any step-over or
3434 decr_pc_after_break adjustment is always taken
3435 care of while the breakpoint is still
3437 stop_all_lwps (1, event_child
);
3439 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3440 event_child
->exit_jump_pad_bkpt
= NULL
;
3442 unstop_all_lwps (1, event_child
);
3444 gdb_assert (event_child
->suspended
>= 0);
3448 if (event_child
->collecting_fast_tracepoint
3449 == fast_tpoint_collect_result::not_collecting
)
3452 debug_printf ("fast tracepoint finished "
3453 "collecting successfully.\n");
3455 /* We may have a deferred signal to report. */
3456 if (dequeue_one_deferred_signal (event_child
, &w
))
3459 debug_printf ("dequeued one signal.\n");
3464 debug_printf ("no deferred signals.\n");
3466 if (stabilizing_threads
)
3468 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3469 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3473 debug_printf ("linux_wait_1 ret = %s, stopped "
3474 "while stabilizing threads\n",
3475 target_pid_to_str (ptid_of (current_thread
)));
3479 return ptid_of (current_thread
);
3485 /* Check whether GDB would be interested in this event. */
3487 /* Check if GDB is interested in this syscall. */
3489 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3490 && !gdb_catch_this_syscall_p (event_child
))
3494 debug_printf ("Ignored syscall for LWP %ld.\n",
3495 lwpid_of (current_thread
));
3498 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3503 return ignore_event (ourstatus
);
3506 /* If GDB is not interested in this signal, don't stop other
3507 threads, and don't report it to GDB. Just resume the inferior
3508 right away. We do this for threading-related signals as well as
3509 any that GDB specifically requested we ignore. But never ignore
3510 SIGSTOP if we sent it ourselves, and do not ignore signals when
3511 stepping - they may require special handling to skip the signal
3512 handler. Also never ignore signals that could be caused by a
3515 && current_thread
->last_resume_kind
!= resume_step
3517 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3518 (current_process ()->priv
->thread_db
!= NULL
3519 && (WSTOPSIG (w
) == __SIGRTMIN
3520 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3523 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3524 && !(WSTOPSIG (w
) == SIGSTOP
3525 && current_thread
->last_resume_kind
== resume_stop
)
3526 && !linux_wstatus_maybe_breakpoint (w
))))
3528 siginfo_t info
, *info_p
;
3531 debug_printf ("Ignored signal %d for LWP %ld.\n",
3532 WSTOPSIG (w
), lwpid_of (current_thread
));
3534 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3535 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3540 if (step_over_finished
)
3542 /* We cancelled this thread's step-over above. We still
3543 need to unsuspend all other LWPs, and set them back
3544 running again while the signal handler runs. */
3545 unsuspend_all_lwps (event_child
);
3547 /* Enqueue the pending signal info so that proceed_all_lwps
3549 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3551 proceed_all_lwps ();
3555 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3556 WSTOPSIG (w
), info_p
);
3562 return ignore_event (ourstatus
);
3565 /* Note that all addresses are always "out of the step range" when
3566 there's no range to begin with. */
3567 in_step_range
= lwp_in_step_range (event_child
);
3569 /* If GDB wanted this thread to single step, and the thread is out
3570 of the step range, we always want to report the SIGTRAP, and let
3571 GDB handle it. Watchpoints should always be reported. So should
3572 signals we can't explain. A SIGTRAP we can't explain could be a
3573 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3574 do, we're be able to handle GDB breakpoints on top of internal
3575 breakpoints, by handling the internal breakpoint and still
3576 reporting the event to GDB. If we don't, we're out of luck, GDB
3577 won't see the breakpoint hit. If we see a single-step event but
3578 the thread should be continuing, don't pass the trap to gdb.
3579 That indicates that we had previously finished a single-step but
3580 left the single-step pending -- see
3581 complete_ongoing_step_over. */
3582 report_to_gdb
= (!maybe_internal_trap
3583 || (current_thread
->last_resume_kind
== resume_step
3585 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3587 && !bp_explains_trap
3589 && !step_over_finished
3590 && !(current_thread
->last_resume_kind
== resume_continue
3591 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3592 || (gdb_breakpoint_here (event_child
->stop_pc
)
3593 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3594 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3595 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3597 run_breakpoint_commands (event_child
->stop_pc
);
3599 /* We found no reason GDB would want us to stop. We either hit one
3600 of our own breakpoints, or finished an internal step GDB
3601 shouldn't know about. */
3606 if (bp_explains_trap
)
3607 debug_printf ("Hit a gdbserver breakpoint.\n");
3608 if (step_over_finished
)
3609 debug_printf ("Step-over finished.\n");
3611 debug_printf ("Tracepoint event.\n");
3612 if (lwp_in_step_range (event_child
))
3613 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3614 paddress (event_child
->stop_pc
),
3615 paddress (event_child
->step_range_start
),
3616 paddress (event_child
->step_range_end
));
3619 /* We're not reporting this breakpoint to GDB, so apply the
3620 decr_pc_after_break adjustment to the inferior's regcache
3623 if (the_low_target
.set_pc
!= NULL
)
3625 struct regcache
*regcache
3626 = get_thread_regcache (current_thread
, 1);
3627 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3630 if (step_over_finished
)
3632 /* If we have finished stepping over a breakpoint, we've
3633 stopped and suspended all LWPs momentarily except the
3634 stepping one. This is where we resume them all again.
3635 We're going to keep waiting, so use proceed, which
3636 handles stepping over the next breakpoint. */
3637 unsuspend_all_lwps (event_child
);
3641 /* Remove the single-step breakpoints if any. Note that
3642 there isn't single-step breakpoint if we finished stepping
3644 if (can_software_single_step ()
3645 && has_single_step_breakpoints (current_thread
))
3647 stop_all_lwps (0, event_child
);
3648 delete_single_step_breakpoints (current_thread
);
3649 unstop_all_lwps (0, event_child
);
3654 debug_printf ("proceeding all threads.\n");
3655 proceed_all_lwps ();
3660 return ignore_event (ourstatus
);
3665 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3668 = target_waitstatus_to_string (&event_child
->waitstatus
);
3670 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3671 lwpid_of (get_lwp_thread (event_child
)), str
.c_str ());
3673 if (current_thread
->last_resume_kind
== resume_step
)
3675 if (event_child
->step_range_start
== event_child
->step_range_end
)
3676 debug_printf ("GDB wanted to single-step, reporting event.\n");
3677 else if (!lwp_in_step_range (event_child
))
3678 debug_printf ("Out of step range, reporting event.\n");
3680 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3681 debug_printf ("Stopped by watchpoint.\n");
3682 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3683 debug_printf ("Stopped by GDB breakpoint.\n");
3685 debug_printf ("Hit a non-gdbserver trap event.\n");
3688 /* Alright, we're going to report a stop. */
3690 /* Remove single-step breakpoints. */
3691 if (can_software_single_step ())
3693 /* Remove single-step breakpoints or not. It it is true, stop all
3694 lwps, so that other threads won't hit the breakpoint in the
3696 int remove_single_step_breakpoints_p
= 0;
3700 remove_single_step_breakpoints_p
3701 = has_single_step_breakpoints (current_thread
);
3705 /* In all-stop, a stop reply cancels all previous resume
3706 requests. Delete all single-step breakpoints. */
3708 find_thread ([&] (thread_info
*thread
) {
3709 if (has_single_step_breakpoints (thread
))
3711 remove_single_step_breakpoints_p
= 1;
3719 if (remove_single_step_breakpoints_p
)
3721 /* If we remove single-step breakpoints from memory, stop all lwps,
3722 so that other threads won't hit the breakpoint in the staled
3724 stop_all_lwps (0, event_child
);
3728 gdb_assert (has_single_step_breakpoints (current_thread
));
3729 delete_single_step_breakpoints (current_thread
);
3733 for_each_thread ([] (thread_info
*thread
){
3734 if (has_single_step_breakpoints (thread
))
3735 delete_single_step_breakpoints (thread
);
3739 unstop_all_lwps (0, event_child
);
3743 if (!stabilizing_threads
)
3745 /* In all-stop, stop all threads. */
3747 stop_all_lwps (0, NULL
);
3749 if (step_over_finished
)
3753 /* If we were doing a step-over, all other threads but
3754 the stepping one had been paused in start_step_over,
3755 with their suspend counts incremented. We don't want
3756 to do a full unstop/unpause, because we're in
3757 all-stop mode (so we want threads stopped), but we
3758 still need to unsuspend the other threads, to
3759 decrement their `suspended' count back. */
3760 unsuspend_all_lwps (event_child
);
3764 /* If we just finished a step-over, then all threads had
3765 been momentarily paused. In all-stop, that's fine,
3766 we want threads stopped by now anyway. In non-stop,
3767 we need to re-resume threads that GDB wanted to be
3769 unstop_all_lwps (1, event_child
);
3773 /* If we're not waiting for a specific LWP, choose an event LWP
3774 from among those that have had events. Giving equal priority
3775 to all LWPs that have had events helps prevent
3777 if (ptid_equal (ptid
, minus_one_ptid
))
3779 event_child
->status_pending_p
= 1;
3780 event_child
->status_pending
= w
;
3782 select_event_lwp (&event_child
);
3784 /* current_thread and event_child must stay in sync. */
3785 current_thread
= get_lwp_thread (event_child
);
3787 event_child
->status_pending_p
= 0;
3788 w
= event_child
->status_pending
;
3792 /* Stabilize threads (move out of jump pads). */
3794 stabilize_threads ();
3798 /* If we just finished a step-over, then all threads had been
3799 momentarily paused. In all-stop, that's fine, we want
3800 threads stopped by now anyway. In non-stop, we need to
3801 re-resume threads that GDB wanted to be running. */
3802 if (step_over_finished
)
3803 unstop_all_lwps (1, event_child
);
3806 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3808 /* If the reported event is an exit, fork, vfork or exec, let
3811 /* Break the unreported fork relationship chain. */
3812 if (event_child
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
3813 || event_child
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
)
3815 event_child
->fork_relative
->fork_relative
= NULL
;
3816 event_child
->fork_relative
= NULL
;
3819 *ourstatus
= event_child
->waitstatus
;
3820 /* Clear the event lwp's waitstatus since we handled it already. */
3821 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3824 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3826 /* Now that we've selected our final event LWP, un-adjust its PC if
3827 it was a software breakpoint, and the client doesn't know we can
3828 adjust the breakpoint ourselves. */
3829 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3830 && !swbreak_feature
)
3832 int decr_pc
= the_low_target
.decr_pc_after_break
;
3836 struct regcache
*regcache
3837 = get_thread_regcache (current_thread
, 1);
3838 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3842 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3844 get_syscall_trapinfo (event_child
,
3845 &ourstatus
->value
.syscall_number
);
3846 ourstatus
->kind
= event_child
->syscall_state
;
3848 else if (current_thread
->last_resume_kind
== resume_stop
3849 && WSTOPSIG (w
) == SIGSTOP
)
3851 /* A thread that has been requested to stop by GDB with vCont;t,
3852 and it stopped cleanly, so report as SIG0. The use of
3853 SIGSTOP is an implementation detail. */
3854 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
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 but, it stopped for other reasons. */
3861 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3863 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3865 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3868 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3872 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3873 target_pid_to_str (ptid_of (current_thread
)),
3874 ourstatus
->kind
, ourstatus
->value
.sig
);
3878 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3879 return filter_exit_event (event_child
, ourstatus
);
3881 return ptid_of (current_thread
);
3884 /* Get rid of any pending event in the pipe. */
3886 async_file_flush (void)
3892 ret
= read (linux_event_pipe
[0], &buf
, 1);
3893 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3896 /* Put something in the pipe, so the event loop wakes up. */
3898 async_file_mark (void)
3902 async_file_flush ();
3905 ret
= write (linux_event_pipe
[1], "+", 1);
3906 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3908 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3909 be awakened anyway. */
3913 linux_wait (ptid_t ptid
,
3914 struct target_waitstatus
*ourstatus
, int target_options
)
3918 /* Flush the async file first. */
3919 if (target_is_async_p ())
3920 async_file_flush ();
3924 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3926 while ((target_options
& TARGET_WNOHANG
) == 0
3927 && ptid_equal (event_ptid
, null_ptid
)
3928 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3930 /* If at least one stop was reported, there may be more. A single
3931 SIGCHLD can signal more than one child stop. */
3932 if (target_is_async_p ()
3933 && (target_options
& TARGET_WNOHANG
) != 0
3934 && !ptid_equal (event_ptid
, null_ptid
))
3940 /* Send a signal to an LWP. */
3943 kill_lwp (unsigned long lwpid
, int signo
)
3948 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3949 if (errno
== ENOSYS
)
3951 /* If tkill fails, then we are not using nptl threads, a
3952 configuration we no longer support. */
3953 perror_with_name (("tkill"));
3959 linux_stop_lwp (struct lwp_info
*lwp
)
3965 send_sigstop (struct lwp_info
*lwp
)
3969 pid
= lwpid_of (get_lwp_thread (lwp
));
3971 /* If we already have a pending stop signal for this process, don't
3973 if (lwp
->stop_expected
)
3976 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3982 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3984 lwp
->stop_expected
= 1;
3985 kill_lwp (pid
, SIGSTOP
);
3989 send_sigstop_callback (thread_info
*thread
, void *except
)
3991 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3993 /* Ignore EXCEPT. */
4004 /* Increment the suspend count of an LWP, and stop it, if not stopped
4007 suspend_and_send_sigstop_callback (thread_info
*thread
, void *except
)
4009 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4011 /* Ignore EXCEPT. */
4015 lwp_suspended_inc (lwp
);
4017 return send_sigstop_callback (thread
, except
);
4021 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
4023 /* Store the exit status for later. */
4024 lwp
->status_pending_p
= 1;
4025 lwp
->status_pending
= wstat
;
4027 /* Store in waitstatus as well, as there's nothing else to process
4029 if (WIFEXITED (wstat
))
4031 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
4032 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
4034 else if (WIFSIGNALED (wstat
))
4036 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
4037 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
4040 /* Prevent trying to stop it. */
4043 /* No further stops are expected from a dead lwp. */
4044 lwp
->stop_expected
= 0;
4047 /* Return true if LWP has exited already, and has a pending exit event
4048 to report to GDB. */
4051 lwp_is_marked_dead (struct lwp_info
*lwp
)
4053 return (lwp
->status_pending_p
4054 && (WIFEXITED (lwp
->status_pending
)
4055 || WIFSIGNALED (lwp
->status_pending
)));
4058 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4061 wait_for_sigstop (void)
4063 struct thread_info
*saved_thread
;
4068 saved_thread
= current_thread
;
4069 if (saved_thread
!= NULL
)
4070 saved_tid
= saved_thread
->id
;
4072 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4075 debug_printf ("wait_for_sigstop: pulling events\n");
4077 /* Passing NULL_PTID as filter indicates we want all events to be
4078 left pending. Eventually this returns when there are no
4079 unwaited-for children left. */
4080 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4082 gdb_assert (ret
== -1);
4084 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4085 current_thread
= saved_thread
;
4089 debug_printf ("Previously current thread died.\n");
4091 /* We can't change the current inferior behind GDB's back,
4092 otherwise, a subsequent command may apply to the wrong
4094 current_thread
= NULL
;
4098 /* Returns true if THREAD is stopped in a jump pad, and we can't
4099 move it out, because we need to report the stop event to GDB. For
4100 example, if the user puts a breakpoint in the jump pad, it's
4101 because she wants to debug it. */
4104 stuck_in_jump_pad_callback (thread_info
*thread
)
4106 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4108 if (lwp
->suspended
!= 0)
4110 internal_error (__FILE__
, __LINE__
,
4111 "LWP %ld is suspended, suspended=%d\n",
4112 lwpid_of (thread
), lwp
->suspended
);
4114 gdb_assert (lwp
->stopped
);
4116 /* Allow debugging the jump pad, gdb_collect, etc.. */
4117 return (supports_fast_tracepoints ()
4118 && agent_loaded_p ()
4119 && (gdb_breakpoint_here (lwp
->stop_pc
)
4120 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4121 || thread
->last_resume_kind
== resume_step
)
4122 && (linux_fast_tracepoint_collecting (lwp
, NULL
)
4123 != fast_tpoint_collect_result::not_collecting
));
4127 move_out_of_jump_pad_callback (thread_info
*thread
)
4129 struct thread_info
*saved_thread
;
4130 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4133 if (lwp
->suspended
!= 0)
4135 internal_error (__FILE__
, __LINE__
,
4136 "LWP %ld is suspended, suspended=%d\n",
4137 lwpid_of (thread
), lwp
->suspended
);
4139 gdb_assert (lwp
->stopped
);
4141 /* For gdb_breakpoint_here. */
4142 saved_thread
= current_thread
;
4143 current_thread
= thread
;
4145 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4147 /* Allow debugging the jump pad, gdb_collect, etc. */
4148 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4149 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4150 && thread
->last_resume_kind
!= resume_step
4151 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4154 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4159 lwp
->status_pending_p
= 0;
4160 enqueue_one_deferred_signal (lwp
, wstat
);
4163 debug_printf ("Signal %d for LWP %ld deferred "
4165 WSTOPSIG (*wstat
), lwpid_of (thread
));
4168 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4171 lwp_suspended_inc (lwp
);
4173 current_thread
= saved_thread
;
4177 lwp_running (thread_info
*thread
, void *data
)
4179 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4181 if (lwp_is_marked_dead (lwp
))
4188 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4189 If SUSPEND, then also increase the suspend count of every LWP,
4193 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4195 /* Should not be called recursively. */
4196 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4201 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4202 suspend
? "stop-and-suspend" : "stop",
4204 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4208 stopping_threads
= (suspend
4209 ? STOPPING_AND_SUSPENDING_THREADS
4210 : STOPPING_THREADS
);
4213 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
4215 find_inferior (&all_threads
, send_sigstop_callback
, except
);
4216 wait_for_sigstop ();
4217 stopping_threads
= NOT_STOPPING_THREADS
;
4221 debug_printf ("stop_all_lwps done, setting stopping_threads "
4222 "back to !stopping\n");
4227 /* Enqueue one signal in the chain of signals which need to be
4228 delivered to this process on next resume. */
4231 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4233 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4235 p_sig
->prev
= lwp
->pending_signals
;
4236 p_sig
->signal
= signal
;
4238 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4240 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4241 lwp
->pending_signals
= p_sig
;
4244 /* Install breakpoints for software single stepping. */
4247 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4249 struct thread_info
*thread
= get_lwp_thread (lwp
);
4250 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4251 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
4253 current_thread
= thread
;
4254 std::vector
<CORE_ADDR
> next_pcs
= the_low_target
.get_next_pcs (regcache
);
4256 for (CORE_ADDR pc
: next_pcs
)
4257 set_single_step_breakpoint (pc
, current_ptid
);
4259 do_cleanups (old_chain
);
4262 /* Single step via hardware or software single step.
4263 Return 1 if hardware single stepping, 0 if software single stepping
4264 or can't single step. */
4267 single_step (struct lwp_info
* lwp
)
4271 if (can_hardware_single_step ())
4275 else if (can_software_single_step ())
4277 install_software_single_step_breakpoints (lwp
);
4283 debug_printf ("stepping is not implemented on this target");
4289 /* The signal can be delivered to the inferior if we are not trying to
4290 finish a fast tracepoint collect. Since signal can be delivered in
4291 the step-over, the program may go to signal handler and trap again
4292 after return from the signal handler. We can live with the spurious
4296 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4298 return (lwp
->collecting_fast_tracepoint
4299 == fast_tpoint_collect_result::not_collecting
);
4302 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4303 SIGNAL is nonzero, give it that signal. */
4306 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4307 int step
, int signal
, siginfo_t
*info
)
4309 struct thread_info
*thread
= get_lwp_thread (lwp
);
4310 struct thread_info
*saved_thread
;
4312 struct process_info
*proc
= get_thread_process (thread
);
4314 /* Note that target description may not be initialised
4315 (proc->tdesc == NULL) at this point because the program hasn't
4316 stopped at the first instruction yet. It means GDBserver skips
4317 the extra traps from the wrapper program (see option --wrapper).
4318 Code in this function that requires register access should be
4319 guarded by proc->tdesc == NULL or something else. */
4321 if (lwp
->stopped
== 0)
4324 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4326 fast_tpoint_collect_result fast_tp_collecting
4327 = lwp
->collecting_fast_tracepoint
;
4329 gdb_assert (!stabilizing_threads
4330 || (fast_tp_collecting
4331 != fast_tpoint_collect_result::not_collecting
));
4333 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4334 user used the "jump" command, or "set $pc = foo"). */
4335 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4337 /* Collecting 'while-stepping' actions doesn't make sense
4339 release_while_stepping_state_list (thread
);
4342 /* If we have pending signals or status, and a new signal, enqueue the
4343 signal. Also enqueue the signal if it can't be delivered to the
4344 inferior right now. */
4346 && (lwp
->status_pending_p
4347 || lwp
->pending_signals
!= NULL
4348 || !lwp_signal_can_be_delivered (lwp
)))
4350 enqueue_pending_signal (lwp
, signal
, info
);
4352 /* Postpone any pending signal. It was enqueued above. */
4356 if (lwp
->status_pending_p
)
4359 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4360 " has pending status\n",
4361 lwpid_of (thread
), step
? "step" : "continue",
4362 lwp
->stop_expected
? "expected" : "not expected");
4366 saved_thread
= current_thread
;
4367 current_thread
= thread
;
4369 /* This bit needs some thinking about. If we get a signal that
4370 we must report while a single-step reinsert is still pending,
4371 we often end up resuming the thread. It might be better to
4372 (ew) allow a stack of pending events; then we could be sure that
4373 the reinsert happened right away and not lose any signals.
4375 Making this stack would also shrink the window in which breakpoints are
4376 uninserted (see comment in linux_wait_for_lwp) but not enough for
4377 complete correctness, so it won't solve that problem. It may be
4378 worthwhile just to solve this one, however. */
4379 if (lwp
->bp_reinsert
!= 0)
4382 debug_printf (" pending reinsert at 0x%s\n",
4383 paddress (lwp
->bp_reinsert
));
4385 if (can_hardware_single_step ())
4387 if (fast_tp_collecting
== fast_tpoint_collect_result::not_collecting
)
4390 warning ("BAD - reinserting but not stepping.");
4392 warning ("BAD - reinserting and suspended(%d).",
4397 step
= maybe_hw_step (thread
);
4400 if (fast_tp_collecting
== fast_tpoint_collect_result::before_insn
)
4403 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4404 " (exit-jump-pad-bkpt)\n",
4407 else if (fast_tp_collecting
== fast_tpoint_collect_result::at_insn
)
4410 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4411 " single-stepping\n",
4414 if (can_hardware_single_step ())
4418 internal_error (__FILE__
, __LINE__
,
4419 "moving out of jump pad single-stepping"
4420 " not implemented on this target");
4424 /* If we have while-stepping actions in this thread set it stepping.
4425 If we have a signal to deliver, it may or may not be set to
4426 SIG_IGN, we don't know. Assume so, and allow collecting
4427 while-stepping into a signal handler. A possible smart thing to
4428 do would be to set an internal breakpoint at the signal return
4429 address, continue, and carry on catching this while-stepping
4430 action only when that breakpoint is hit. A future
4432 if (thread
->while_stepping
!= NULL
)
4435 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4438 step
= single_step (lwp
);
4441 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4443 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4445 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4449 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4450 (long) lwp
->stop_pc
);
4454 /* If we have pending signals, consume one if it can be delivered to
4456 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4458 struct pending_signals
**p_sig
;
4460 p_sig
= &lwp
->pending_signals
;
4461 while ((*p_sig
)->prev
!= NULL
)
4462 p_sig
= &(*p_sig
)->prev
;
4464 signal
= (*p_sig
)->signal
;
4465 if ((*p_sig
)->info
.si_signo
!= 0)
4466 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4474 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4475 lwpid_of (thread
), step
? "step" : "continue", signal
,
4476 lwp
->stop_expected
? "expected" : "not expected");
4478 if (the_low_target
.prepare_to_resume
!= NULL
)
4479 the_low_target
.prepare_to_resume (lwp
);
4481 regcache_invalidate_thread (thread
);
4483 lwp
->stepping
= step
;
4485 ptrace_request
= PTRACE_SINGLESTEP
;
4486 else if (gdb_catching_syscalls_p (lwp
))
4487 ptrace_request
= PTRACE_SYSCALL
;
4489 ptrace_request
= PTRACE_CONT
;
4490 ptrace (ptrace_request
,
4492 (PTRACE_TYPE_ARG3
) 0,
4493 /* Coerce to a uintptr_t first to avoid potential gcc warning
4494 of coercing an 8 byte integer to a 4 byte pointer. */
4495 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4497 current_thread
= saved_thread
;
4499 perror_with_name ("resuming thread");
4501 /* Successfully resumed. Clear state that no longer makes sense,
4502 and mark the LWP as running. Must not do this before resuming
4503 otherwise if that fails other code will be confused. E.g., we'd
4504 later try to stop the LWP and hang forever waiting for a stop
4505 status. Note that we must not throw after this is cleared,
4506 otherwise handle_zombie_lwp_error would get confused. */
4508 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4511 /* Called when we try to resume a stopped LWP and that errors out. If
4512 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4513 or about to become), discard the error, clear any pending status
4514 the LWP may have, and return true (we'll collect the exit status
4515 soon enough). Otherwise, return false. */
4518 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4520 struct thread_info
*thread
= get_lwp_thread (lp
);
4522 /* If we get an error after resuming the LWP successfully, we'd
4523 confuse !T state for the LWP being gone. */
4524 gdb_assert (lp
->stopped
);
4526 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4527 because even if ptrace failed with ESRCH, the tracee may be "not
4528 yet fully dead", but already refusing ptrace requests. In that
4529 case the tracee has 'R (Running)' state for a little bit
4530 (observed in Linux 3.18). See also the note on ESRCH in the
4531 ptrace(2) man page. Instead, check whether the LWP has any state
4532 other than ptrace-stopped. */
4534 /* Don't assume anything if /proc/PID/status can't be read. */
4535 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4537 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4538 lp
->status_pending_p
= 0;
4544 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4545 disappears while we try to resume it. */
4548 linux_resume_one_lwp (struct lwp_info
*lwp
,
4549 int step
, int signal
, siginfo_t
*info
)
4553 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4555 CATCH (ex
, RETURN_MASK_ERROR
)
4557 if (!check_ptrace_stopped_lwp_gone (lwp
))
4558 throw_exception (ex
);
4563 /* This function is called once per thread via for_each_thread.
4564 We look up which resume request applies to THREAD and mark it with a
4565 pointer to the appropriate resume request.
4567 This algorithm is O(threads * resume elements), but resume elements
4568 is small (and will remain small at least until GDB supports thread
4572 linux_set_resume_request (thread_info
*thread
, thread_resume
*resume
, size_t n
)
4574 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4576 for (int ndx
= 0; ndx
< n
; ndx
++)
4578 ptid_t ptid
= resume
[ndx
].thread
;
4579 if (ptid_equal (ptid
, minus_one_ptid
)
4580 || ptid
== thread
->id
4581 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4583 || (ptid_get_pid (ptid
) == pid_of (thread
)
4584 && (ptid_is_pid (ptid
)
4585 || ptid_get_lwp (ptid
) == -1)))
4587 if (resume
[ndx
].kind
== resume_stop
4588 && thread
->last_resume_kind
== resume_stop
)
4591 debug_printf ("already %s LWP %ld at GDB's request\n",
4592 (thread
->last_status
.kind
4593 == TARGET_WAITKIND_STOPPED
)
4601 /* Ignore (wildcard) resume requests for already-resumed
4603 if (resume
[ndx
].kind
!= resume_stop
4604 && thread
->last_resume_kind
!= resume_stop
)
4607 debug_printf ("already %s LWP %ld at GDB's request\n",
4608 (thread
->last_resume_kind
4616 /* Don't let wildcard resumes resume fork children that GDB
4617 does not yet know are new fork children. */
4618 if (lwp
->fork_relative
!= NULL
)
4620 struct lwp_info
*rel
= lwp
->fork_relative
;
4622 if (rel
->status_pending_p
4623 && (rel
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
4624 || rel
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
))
4627 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4633 /* If the thread has a pending event that has already been
4634 reported to GDBserver core, but GDB has not pulled the
4635 event out of the vStopped queue yet, likewise, ignore the
4636 (wildcard) resume request. */
4637 if (in_queued_stop_replies (thread
->id
))
4640 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4645 lwp
->resume
= &resume
[ndx
];
4646 thread
->last_resume_kind
= lwp
->resume
->kind
;
4648 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4649 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4651 /* If we had a deferred signal to report, dequeue one now.
4652 This can happen if LWP gets more than one signal while
4653 trying to get out of a jump pad. */
4655 && !lwp
->status_pending_p
4656 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4658 lwp
->status_pending_p
= 1;
4661 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4662 "leaving status pending.\n",
4663 WSTOPSIG (lwp
->status_pending
),
4671 /* No resume action for this thread. */
4675 /* find_inferior callback for linux_resume.
4676 Set *FLAG_P if this lwp has an interesting status pending. */
4679 resume_status_pending_p (thread_info
*thread
)
4681 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4683 /* LWPs which will not be resumed are not interesting, because
4684 we might not wait for them next time through linux_wait. */
4685 if (lwp
->resume
== NULL
)
4688 return thread_still_has_status_pending_p (thread
);
4691 /* Return 1 if this lwp that GDB wants running is stopped at an
4692 internal breakpoint that we need to step over. It assumes that any
4693 required STOP_PC adjustment has already been propagated to the
4694 inferior's regcache. */
4697 need_step_over_p (thread_info
*thread
)
4699 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4700 struct thread_info
*saved_thread
;
4702 struct process_info
*proc
= get_thread_process (thread
);
4704 /* GDBserver is skipping the extra traps from the wrapper program,
4705 don't have to do step over. */
4706 if (proc
->tdesc
== NULL
)
4709 /* LWPs which will not be resumed are not interesting, because we
4710 might not wait for them next time through linux_wait. */
4715 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4720 if (thread
->last_resume_kind
== resume_stop
)
4723 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4729 gdb_assert (lwp
->suspended
>= 0);
4734 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4739 if (lwp
->status_pending_p
)
4742 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4748 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4752 /* If the PC has changed since we stopped, then don't do anything,
4753 and let the breakpoint/tracepoint be hit. This happens if, for
4754 instance, GDB handled the decr_pc_after_break subtraction itself,
4755 GDB is OOL stepping this thread, or the user has issued a "jump"
4756 command, or poked thread's registers herself. */
4757 if (pc
!= lwp
->stop_pc
)
4760 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4761 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4763 paddress (lwp
->stop_pc
), paddress (pc
));
4767 /* On software single step target, resume the inferior with signal
4768 rather than stepping over. */
4769 if (can_software_single_step ()
4770 && lwp
->pending_signals
!= NULL
4771 && lwp_signal_can_be_delivered (lwp
))
4774 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4781 saved_thread
= current_thread
;
4782 current_thread
= thread
;
4784 /* We can only step over breakpoints we know about. */
4785 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4787 /* Don't step over a breakpoint that GDB expects to hit
4788 though. If the condition is being evaluated on the target's side
4789 and it evaluate to false, step over this breakpoint as well. */
4790 if (gdb_breakpoint_here (pc
)
4791 && gdb_condition_true_at_breakpoint (pc
)
4792 && gdb_no_commands_at_breakpoint (pc
))
4795 debug_printf ("Need step over [LWP %ld]? yes, but found"
4796 " GDB breakpoint at 0x%s; skipping step over\n",
4797 lwpid_of (thread
), paddress (pc
));
4799 current_thread
= saved_thread
;
4805 debug_printf ("Need step over [LWP %ld]? yes, "
4806 "found breakpoint at 0x%s\n",
4807 lwpid_of (thread
), paddress (pc
));
4809 /* We've found an lwp that needs stepping over --- return 1 so
4810 that find_inferior stops looking. */
4811 current_thread
= saved_thread
;
4817 current_thread
= saved_thread
;
4820 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4822 lwpid_of (thread
), paddress (pc
));
4827 /* Start a step-over operation on LWP. When LWP stopped at a
4828 breakpoint, to make progress, we need to remove the breakpoint out
4829 of the way. If we let other threads run while we do that, they may
4830 pass by the breakpoint location and miss hitting it. To avoid
4831 that, a step-over momentarily stops all threads while LWP is
4832 single-stepped by either hardware or software while the breakpoint
4833 is temporarily uninserted from the inferior. When the single-step
4834 finishes, we reinsert the breakpoint, and let all threads that are
4835 supposed to be running, run again. */
4838 start_step_over (struct lwp_info
*lwp
)
4840 struct thread_info
*thread
= get_lwp_thread (lwp
);
4841 struct thread_info
*saved_thread
;
4846 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4849 stop_all_lwps (1, lwp
);
4851 if (lwp
->suspended
!= 0)
4853 internal_error (__FILE__
, __LINE__
,
4854 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4859 debug_printf ("Done stopping all threads for step-over.\n");
4861 /* Note, we should always reach here with an already adjusted PC,
4862 either by GDB (if we're resuming due to GDB's request), or by our
4863 caller, if we just finished handling an internal breakpoint GDB
4864 shouldn't care about. */
4867 saved_thread
= current_thread
;
4868 current_thread
= thread
;
4870 lwp
->bp_reinsert
= pc
;
4871 uninsert_breakpoints_at (pc
);
4872 uninsert_fast_tracepoint_jumps_at (pc
);
4874 step
= single_step (lwp
);
4876 current_thread
= saved_thread
;
4878 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4880 /* Require next event from this LWP. */
4881 step_over_bkpt
= thread
->id
;
4885 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4886 start_step_over, if still there, and delete any single-step
4887 breakpoints we've set, on non hardware single-step targets. */
4890 finish_step_over (struct lwp_info
*lwp
)
4892 if (lwp
->bp_reinsert
!= 0)
4894 struct thread_info
*saved_thread
= current_thread
;
4897 debug_printf ("Finished step over.\n");
4899 current_thread
= get_lwp_thread (lwp
);
4901 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4902 may be no breakpoint to reinsert there by now. */
4903 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4904 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4906 lwp
->bp_reinsert
= 0;
4908 /* Delete any single-step breakpoints. No longer needed. We
4909 don't have to worry about other threads hitting this trap,
4910 and later not being able to explain it, because we were
4911 stepping over a breakpoint, and we hold all threads but
4912 LWP stopped while doing that. */
4913 if (!can_hardware_single_step ())
4915 gdb_assert (has_single_step_breakpoints (current_thread
));
4916 delete_single_step_breakpoints (current_thread
);
4919 step_over_bkpt
= null_ptid
;
4920 current_thread
= saved_thread
;
4927 /* If there's a step over in progress, wait until all threads stop
4928 (that is, until the stepping thread finishes its step), and
4929 unsuspend all lwps. The stepping thread ends with its status
4930 pending, which is processed later when we get back to processing
4934 complete_ongoing_step_over (void)
4936 if (!ptid_equal (step_over_bkpt
, null_ptid
))
4938 struct lwp_info
*lwp
;
4943 debug_printf ("detach: step over in progress, finish it first\n");
4945 /* Passing NULL_PTID as filter indicates we want all events to
4946 be left pending. Eventually this returns when there are no
4947 unwaited-for children left. */
4948 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4950 gdb_assert (ret
== -1);
4952 lwp
= find_lwp_pid (step_over_bkpt
);
4954 finish_step_over (lwp
);
4955 step_over_bkpt
= null_ptid
;
4956 unsuspend_all_lwps (lwp
);
4960 /* This function is called once per thread. We check the thread's resume
4961 request, which will tell us whether to resume, step, or leave the thread
4962 stopped; and what signal, if any, it should be sent.
4964 For threads which we aren't explicitly told otherwise, we preserve
4965 the stepping flag; this is used for stepping over gdbserver-placed
4968 If pending_flags was set in any thread, we queue any needed
4969 signals, since we won't actually resume. We already have a pending
4970 event to report, so we don't need to preserve any step requests;
4971 they should be re-issued if necessary. */
4974 linux_resume_one_thread (thread_info
*thread
, void *arg
)
4976 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4977 int leave_all_stopped
= * (int *) arg
;
4980 if (lwp
->resume
== NULL
)
4983 if (lwp
->resume
->kind
== resume_stop
)
4986 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4991 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
4993 /* Stop the thread, and wait for the event asynchronously,
4994 through the event loop. */
5000 debug_printf ("already stopped LWP %ld\n",
5003 /* The LWP may have been stopped in an internal event that
5004 was not meant to be notified back to GDB (e.g., gdbserver
5005 breakpoint), so we should be reporting a stop event in
5008 /* If the thread already has a pending SIGSTOP, this is a
5009 no-op. Otherwise, something later will presumably resume
5010 the thread and this will cause it to cancel any pending
5011 operation, due to last_resume_kind == resume_stop. If
5012 the thread already has a pending status to report, we
5013 will still report it the next time we wait - see
5014 status_pending_p_callback. */
5016 /* If we already have a pending signal to report, then
5017 there's no need to queue a SIGSTOP, as this means we're
5018 midway through moving the LWP out of the jumppad, and we
5019 will report the pending signal as soon as that is
5021 if (lwp
->pending_signals_to_report
== NULL
)
5025 /* For stop requests, we're done. */
5027 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5031 /* If this thread which is about to be resumed has a pending status,
5032 then don't resume it - we can just report the pending status.
5033 Likewise if it is suspended, because e.g., another thread is
5034 stepping past a breakpoint. Make sure to queue any signals that
5035 would otherwise be sent. In all-stop mode, we do this decision
5036 based on if *any* thread has a pending status. If there's a
5037 thread that needs the step-over-breakpoint dance, then don't
5038 resume any other thread but that particular one. */
5039 leave_pending
= (lwp
->suspended
5040 || lwp
->status_pending_p
5041 || leave_all_stopped
);
5043 /* If we have a new signal, enqueue the signal. */
5044 if (lwp
->resume
->sig
!= 0)
5046 siginfo_t info
, *info_p
;
5048 /* If this is the same signal we were previously stopped by,
5049 make sure to queue its siginfo. */
5050 if (WIFSTOPPED (lwp
->last_status
)
5051 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
5052 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
5053 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
5058 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
5064 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
5066 proceed_one_lwp (thread
, NULL
);
5071 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5074 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5080 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5082 struct thread_info
*need_step_over
= NULL
;
5083 int leave_all_stopped
;
5088 debug_printf ("linux_resume:\n");
5091 for_each_thread ([&] (thread_info
*thread
)
5093 linux_set_resume_request (thread
, resume_info
, n
);
5096 /* If there is a thread which would otherwise be resumed, which has
5097 a pending status, then don't resume any threads - we can just
5098 report the pending status. Make sure to queue any signals that
5099 would otherwise be sent. In non-stop mode, we'll apply this
5100 logic to each thread individually. We consume all pending events
5101 before considering to start a step-over (in all-stop). */
5102 bool any_pending
= false;
5104 any_pending
= find_thread (resume_status_pending_p
) != NULL
;
5106 /* If there is a thread which would otherwise be resumed, which is
5107 stopped at a breakpoint that needs stepping over, then don't
5108 resume any threads - have it step over the breakpoint with all
5109 other threads stopped, then resume all threads again. Make sure
5110 to queue any signals that would otherwise be delivered or
5112 if (!any_pending
&& supports_breakpoints ())
5113 need_step_over
= find_thread (need_step_over_p
);
5115 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5119 if (need_step_over
!= NULL
)
5120 debug_printf ("Not resuming all, need step over\n");
5121 else if (any_pending
)
5122 debug_printf ("Not resuming, all-stop and found "
5123 "an LWP with pending status\n");
5125 debug_printf ("Resuming, no pending status or step over needed\n");
5128 /* Even if we're leaving threads stopped, queue all signals we'd
5129 otherwise deliver. */
5130 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
5133 start_step_over (get_thread_lwp (need_step_over
));
5137 debug_printf ("linux_resume done\n");
5141 /* We may have events that were pending that can/should be sent to
5142 the client now. Trigger a linux_wait call. */
5143 if (target_is_async_p ())
5147 /* This function is called once per thread. We check the thread's
5148 last resume request, which will tell us whether to resume, step, or
5149 leave the thread stopped. Any signal the client requested to be
5150 delivered has already been enqueued at this point.
5152 If any thread that GDB wants running is stopped at an internal
5153 breakpoint that needs stepping over, we start a step-over operation
5154 on that particular thread, and leave all others stopped. */
5157 proceed_one_lwp (thread_info
*thread
, void *except
)
5159 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5166 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5171 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5175 if (thread
->last_resume_kind
== resume_stop
5176 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5179 debug_printf (" client wants LWP to remain %ld stopped\n",
5184 if (lwp
->status_pending_p
)
5187 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5192 gdb_assert (lwp
->suspended
>= 0);
5197 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5201 if (thread
->last_resume_kind
== resume_stop
5202 && lwp
->pending_signals_to_report
== NULL
5203 && (lwp
->collecting_fast_tracepoint
5204 == fast_tpoint_collect_result::not_collecting
))
5206 /* We haven't reported this LWP as stopped yet (otherwise, the
5207 last_status.kind check above would catch it, and we wouldn't
5208 reach here. This LWP may have been momentarily paused by a
5209 stop_all_lwps call while handling for example, another LWP's
5210 step-over. In that case, the pending expected SIGSTOP signal
5211 that was queued at vCont;t handling time will have already
5212 been consumed by wait_for_sigstop, and so we need to requeue
5213 another one here. Note that if the LWP already has a SIGSTOP
5214 pending, this is a no-op. */
5217 debug_printf ("Client wants LWP %ld to stop. "
5218 "Making sure it has a SIGSTOP pending\n",
5224 if (thread
->last_resume_kind
== resume_step
)
5227 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5230 /* If resume_step is requested by GDB, install single-step
5231 breakpoints when the thread is about to be actually resumed if
5232 the single-step breakpoints weren't removed. */
5233 if (can_software_single_step ()
5234 && !has_single_step_breakpoints (thread
))
5235 install_software_single_step_breakpoints (lwp
);
5237 step
= maybe_hw_step (thread
);
5239 else if (lwp
->bp_reinsert
!= 0)
5242 debug_printf (" stepping LWP %ld, reinsert set\n",
5245 step
= maybe_hw_step (thread
);
5250 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5255 unsuspend_and_proceed_one_lwp (thread_info
*thread
, void *except
)
5257 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5262 lwp_suspended_decr (lwp
);
5264 return proceed_one_lwp (thread
, except
);
5267 /* When we finish a step-over, set threads running again. If there's
5268 another thread that may need a step-over, now's the time to start
5269 it. Eventually, we'll move all threads past their breakpoints. */
5272 proceed_all_lwps (void)
5274 struct thread_info
*need_step_over
;
5276 /* If there is a thread which would otherwise be resumed, which is
5277 stopped at a breakpoint that needs stepping over, then don't
5278 resume any threads - have it step over the breakpoint with all
5279 other threads stopped, then resume all threads again. */
5281 if (supports_breakpoints ())
5283 need_step_over
= find_thread (need_step_over_p
);
5285 if (need_step_over
!= NULL
)
5288 debug_printf ("proceed_all_lwps: found "
5289 "thread %ld needing a step-over\n",
5290 lwpid_of (need_step_over
));
5292 start_step_over (get_thread_lwp (need_step_over
));
5298 debug_printf ("Proceeding, no step-over needed\n");
5300 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
5303 /* Stopped LWPs that the client wanted to be running, that don't have
5304 pending statuses, are set to run again, except for EXCEPT, if not
5305 NULL. This undoes a stop_all_lwps call. */
5308 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5314 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5315 lwpid_of (get_lwp_thread (except
)));
5317 debug_printf ("unstopping all lwps\n");
5321 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
5323 find_inferior (&all_threads
, proceed_one_lwp
, except
);
5327 debug_printf ("unstop_all_lwps done\n");
5333 #ifdef HAVE_LINUX_REGSETS
5335 #define use_linux_regsets 1
5337 /* Returns true if REGSET has been disabled. */
5340 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5342 return (info
->disabled_regsets
!= NULL
5343 && info
->disabled_regsets
[regset
- info
->regsets
]);
5346 /* Disable REGSET. */
5349 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5353 dr_offset
= regset
- info
->regsets
;
5354 if (info
->disabled_regsets
== NULL
)
5355 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5356 info
->disabled_regsets
[dr_offset
] = 1;
5360 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5361 struct regcache
*regcache
)
5363 struct regset_info
*regset
;
5364 int saw_general_regs
= 0;
5368 pid
= lwpid_of (current_thread
);
5369 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5374 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5377 buf
= xmalloc (regset
->size
);
5379 nt_type
= regset
->nt_type
;
5383 iov
.iov_len
= regset
->size
;
5384 data
= (void *) &iov
;
5390 res
= ptrace (regset
->get_request
, pid
,
5391 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5393 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5399 /* If we get EIO on a regset, do not try it again for
5400 this process mode. */
5401 disable_regset (regsets_info
, regset
);
5403 else if (errno
== ENODATA
)
5405 /* ENODATA may be returned if the regset is currently
5406 not "active". This can happen in normal operation,
5407 so suppress the warning in this case. */
5409 else if (errno
== ESRCH
)
5411 /* At this point, ESRCH should mean the process is
5412 already gone, in which case we simply ignore attempts
5413 to read its registers. */
5418 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5425 if (regset
->type
== GENERAL_REGS
)
5426 saw_general_regs
= 1;
5427 regset
->store_function (regcache
, buf
);
5431 if (saw_general_regs
)
5438 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5439 struct regcache
*regcache
)
5441 struct regset_info
*regset
;
5442 int saw_general_regs
= 0;
5446 pid
= lwpid_of (current_thread
);
5447 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5452 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5453 || regset
->fill_function
== NULL
)
5456 buf
= xmalloc (regset
->size
);
5458 /* First fill the buffer with the current register set contents,
5459 in case there are any items in the kernel's regset that are
5460 not in gdbserver's regcache. */
5462 nt_type
= regset
->nt_type
;
5466 iov
.iov_len
= regset
->size
;
5467 data
= (void *) &iov
;
5473 res
= ptrace (regset
->get_request
, pid
,
5474 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5476 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5481 /* Then overlay our cached registers on that. */
5482 regset
->fill_function (regcache
, buf
);
5484 /* Only now do we write the register set. */
5486 res
= ptrace (regset
->set_request
, pid
,
5487 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5489 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5497 /* If we get EIO on a regset, do not try it again for
5498 this process mode. */
5499 disable_regset (regsets_info
, regset
);
5501 else if (errno
== ESRCH
)
5503 /* At this point, ESRCH should mean the process is
5504 already gone, in which case we simply ignore attempts
5505 to change its registers. See also the related
5506 comment in linux_resume_one_lwp. */
5512 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5515 else if (regset
->type
== GENERAL_REGS
)
5516 saw_general_regs
= 1;
5519 if (saw_general_regs
)
5525 #else /* !HAVE_LINUX_REGSETS */
5527 #define use_linux_regsets 0
5528 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5529 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5533 /* Return 1 if register REGNO is supported by one of the regset ptrace
5534 calls or 0 if it has to be transferred individually. */
5537 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5539 unsigned char mask
= 1 << (regno
% 8);
5540 size_t index
= regno
/ 8;
5542 return (use_linux_regsets
5543 && (regs_info
->regset_bitmap
== NULL
5544 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5547 #ifdef HAVE_LINUX_USRREGS
5550 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5554 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5555 error ("Invalid register number %d.", regnum
);
5557 addr
= usrregs
->regmap
[regnum
];
5562 /* Fetch one register. */
5564 fetch_register (const struct usrregs_info
*usrregs
,
5565 struct regcache
*regcache
, int regno
)
5572 if (regno
>= usrregs
->num_regs
)
5574 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5577 regaddr
= register_addr (usrregs
, regno
);
5581 size
= ((register_size (regcache
->tdesc
, regno
)
5582 + sizeof (PTRACE_XFER_TYPE
) - 1)
5583 & -sizeof (PTRACE_XFER_TYPE
));
5584 buf
= (char *) alloca (size
);
5586 pid
= lwpid_of (current_thread
);
5587 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5590 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5591 ptrace (PTRACE_PEEKUSER
, pid
,
5592 /* Coerce to a uintptr_t first to avoid potential gcc warning
5593 of coercing an 8 byte integer to a 4 byte pointer. */
5594 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5595 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5597 error ("reading register %d: %s", regno
, strerror (errno
));
5600 if (the_low_target
.supply_ptrace_register
)
5601 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5603 supply_register (regcache
, regno
, buf
);
5606 /* Store one register. */
5608 store_register (const struct usrregs_info
*usrregs
,
5609 struct regcache
*regcache
, int regno
)
5616 if (regno
>= usrregs
->num_regs
)
5618 if ((*the_low_target
.cannot_store_register
) (regno
))
5621 regaddr
= register_addr (usrregs
, regno
);
5625 size
= ((register_size (regcache
->tdesc
, regno
)
5626 + sizeof (PTRACE_XFER_TYPE
) - 1)
5627 & -sizeof (PTRACE_XFER_TYPE
));
5628 buf
= (char *) alloca (size
);
5629 memset (buf
, 0, size
);
5631 if (the_low_target
.collect_ptrace_register
)
5632 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5634 collect_register (regcache
, regno
, buf
);
5636 pid
= lwpid_of (current_thread
);
5637 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5640 ptrace (PTRACE_POKEUSER
, pid
,
5641 /* Coerce to a uintptr_t first to avoid potential gcc warning
5642 about coercing an 8 byte integer to a 4 byte pointer. */
5643 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5644 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5647 /* At this point, ESRCH should mean the process is
5648 already gone, in which case we simply ignore attempts
5649 to change its registers. See also the related
5650 comment in linux_resume_one_lwp. */
5654 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5655 error ("writing register %d: %s", regno
, strerror (errno
));
5657 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5661 /* Fetch all registers, or just one, from the child process.
5662 If REGNO is -1, do this for all registers, skipping any that are
5663 assumed to have been retrieved by regsets_fetch_inferior_registers,
5664 unless ALL is non-zero.
5665 Otherwise, REGNO specifies which register (so we can save time). */
5667 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5668 struct regcache
*regcache
, int regno
, int all
)
5670 struct usrregs_info
*usr
= regs_info
->usrregs
;
5674 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5675 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5676 fetch_register (usr
, regcache
, regno
);
5679 fetch_register (usr
, regcache
, regno
);
5682 /* Store our register values back into the inferior.
5683 If REGNO is -1, do this for all registers, skipping any that are
5684 assumed to have been saved by regsets_store_inferior_registers,
5685 unless ALL is non-zero.
5686 Otherwise, REGNO specifies which register (so we can save time). */
5688 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5689 struct regcache
*regcache
, int regno
, int all
)
5691 struct usrregs_info
*usr
= regs_info
->usrregs
;
5695 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5696 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5697 store_register (usr
, regcache
, regno
);
5700 store_register (usr
, regcache
, regno
);
5703 #else /* !HAVE_LINUX_USRREGS */
5705 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5706 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5712 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5716 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5720 if (the_low_target
.fetch_register
!= NULL
5721 && regs_info
->usrregs
!= NULL
)
5722 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5723 (*the_low_target
.fetch_register
) (regcache
, regno
);
5725 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5726 if (regs_info
->usrregs
!= NULL
)
5727 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5731 if (the_low_target
.fetch_register
!= NULL
5732 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5735 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5737 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5739 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5740 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5745 linux_store_registers (struct regcache
*regcache
, int regno
)
5749 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5753 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5755 if (regs_info
->usrregs
!= NULL
)
5756 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5760 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5762 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5764 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5765 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5770 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5771 to debugger memory starting at MYADDR. */
5774 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5776 int pid
= lwpid_of (current_thread
);
5777 PTRACE_XFER_TYPE
*buffer
;
5785 /* Try using /proc. Don't bother for one word. */
5786 if (len
>= 3 * sizeof (long))
5790 /* We could keep this file open and cache it - possibly one per
5791 thread. That requires some juggling, but is even faster. */
5792 sprintf (filename
, "/proc/%d/mem", pid
);
5793 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5797 /* If pread64 is available, use it. It's faster if the kernel
5798 supports it (only one syscall), and it's 64-bit safe even on
5799 32-bit platforms (for instance, SPARC debugging a SPARC64
5802 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5805 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5806 bytes
= read (fd
, myaddr
, len
);
5813 /* Some data was read, we'll try to get the rest with ptrace. */
5823 /* Round starting address down to longword boundary. */
5824 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5825 /* Round ending address up; get number of longwords that makes. */
5826 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5827 / sizeof (PTRACE_XFER_TYPE
));
5828 /* Allocate buffer of that many longwords. */
5829 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5831 /* Read all the longwords */
5833 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5835 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5836 about coercing an 8 byte integer to a 4 byte pointer. */
5837 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5838 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5839 (PTRACE_TYPE_ARG4
) 0);
5845 /* Copy appropriate bytes out of the buffer. */
5848 i
*= sizeof (PTRACE_XFER_TYPE
);
5849 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5851 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5858 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5859 memory at MEMADDR. On failure (cannot write to the inferior)
5860 returns the value of errno. Always succeeds if LEN is zero. */
5863 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5866 /* Round starting address down to longword boundary. */
5867 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5868 /* Round ending address up; get number of longwords that makes. */
5870 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5871 / sizeof (PTRACE_XFER_TYPE
);
5873 /* Allocate buffer of that many longwords. */
5874 PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5876 int pid
= lwpid_of (current_thread
);
5880 /* Zero length write always succeeds. */
5886 /* Dump up to four bytes. */
5887 char str
[4 * 2 + 1];
5889 int dump
= len
< 4 ? len
: 4;
5891 for (i
= 0; i
< dump
; i
++)
5893 sprintf (p
, "%02x", myaddr
[i
]);
5898 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5899 str
, (long) memaddr
, pid
);
5902 /* Fill start and end extra bytes of buffer with existing memory data. */
5905 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5906 about coercing an 8 byte integer to a 4 byte pointer. */
5907 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5908 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5909 (PTRACE_TYPE_ARG4
) 0);
5917 = ptrace (PTRACE_PEEKTEXT
, pid
,
5918 /* Coerce to a uintptr_t first to avoid potential gcc warning
5919 about coercing an 8 byte integer to a 4 byte pointer. */
5920 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5921 * sizeof (PTRACE_XFER_TYPE
)),
5922 (PTRACE_TYPE_ARG4
) 0);
5927 /* Copy data to be written over corresponding part of buffer. */
5929 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5932 /* Write the entire buffer. */
5934 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5937 ptrace (PTRACE_POKETEXT
, pid
,
5938 /* Coerce to a uintptr_t first to avoid potential gcc warning
5939 about coercing an 8 byte integer to a 4 byte pointer. */
5940 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5941 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5950 linux_look_up_symbols (void)
5952 #ifdef USE_THREAD_DB
5953 struct process_info
*proc
= current_process ();
5955 if (proc
->priv
->thread_db
!= NULL
)
5963 linux_request_interrupt (void)
5965 /* Send a SIGINT to the process group. This acts just like the user
5966 typed a ^C on the controlling terminal. */
5967 kill (-signal_pid
, SIGINT
);
5970 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5971 to debugger memory starting at MYADDR. */
5974 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5976 char filename
[PATH_MAX
];
5978 int pid
= lwpid_of (current_thread
);
5980 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5982 fd
= open (filename
, O_RDONLY
);
5986 if (offset
!= (CORE_ADDR
) 0
5987 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5990 n
= read (fd
, myaddr
, len
);
5997 /* These breakpoint and watchpoint related wrapper functions simply
5998 pass on the function call if the target has registered a
5999 corresponding function. */
6002 linux_supports_z_point_type (char z_type
)
6004 return (the_low_target
.supports_z_point_type
!= NULL
6005 && the_low_target
.supports_z_point_type (z_type
));
6009 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6010 int size
, struct raw_breakpoint
*bp
)
6012 if (type
== raw_bkpt_type_sw
)
6013 return insert_memory_breakpoint (bp
);
6014 else if (the_low_target
.insert_point
!= NULL
)
6015 return the_low_target
.insert_point (type
, addr
, size
, bp
);
6017 /* Unsupported (see target.h). */
6022 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6023 int size
, struct raw_breakpoint
*bp
)
6025 if (type
== raw_bkpt_type_sw
)
6026 return remove_memory_breakpoint (bp
);
6027 else if (the_low_target
.remove_point
!= NULL
)
6028 return the_low_target
.remove_point (type
, addr
, size
, bp
);
6030 /* Unsupported (see target.h). */
6034 /* Implement the to_stopped_by_sw_breakpoint target_ops
6038 linux_stopped_by_sw_breakpoint (void)
6040 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6042 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
6045 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
6049 linux_supports_stopped_by_sw_breakpoint (void)
6051 return USE_SIGTRAP_SIGINFO
;
6054 /* Implement the to_stopped_by_hw_breakpoint target_ops
6058 linux_stopped_by_hw_breakpoint (void)
6060 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6062 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6065 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6069 linux_supports_stopped_by_hw_breakpoint (void)
6071 return USE_SIGTRAP_SIGINFO
;
6074 /* Implement the supports_hardware_single_step target_ops method. */
6077 linux_supports_hardware_single_step (void)
6079 return can_hardware_single_step ();
6083 linux_supports_software_single_step (void)
6085 return can_software_single_step ();
6089 linux_stopped_by_watchpoint (void)
6091 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6093 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6097 linux_stopped_data_address (void)
6099 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6101 return lwp
->stopped_data_address
;
6104 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6105 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6106 && defined(PT_TEXT_END_ADDR)
6108 /* This is only used for targets that define PT_TEXT_ADDR,
6109 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6110 the target has different ways of acquiring this information, like
6113 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6114 to tell gdb about. */
6117 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6119 unsigned long text
, text_end
, data
;
6120 int pid
= lwpid_of (current_thread
);
6124 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6125 (PTRACE_TYPE_ARG4
) 0);
6126 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6127 (PTRACE_TYPE_ARG4
) 0);
6128 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6129 (PTRACE_TYPE_ARG4
) 0);
6133 /* Both text and data offsets produced at compile-time (and so
6134 used by gdb) are relative to the beginning of the program,
6135 with the data segment immediately following the text segment.
6136 However, the actual runtime layout in memory may put the data
6137 somewhere else, so when we send gdb a data base-address, we
6138 use the real data base address and subtract the compile-time
6139 data base-address from it (which is just the length of the
6140 text segment). BSS immediately follows data in both
6143 *data_p
= data
- (text_end
- text
);
6152 linux_qxfer_osdata (const char *annex
,
6153 unsigned char *readbuf
, unsigned const char *writebuf
,
6154 CORE_ADDR offset
, int len
)
6156 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6159 /* Convert a native/host siginfo object, into/from the siginfo in the
6160 layout of the inferiors' architecture. */
6163 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6167 if (the_low_target
.siginfo_fixup
!= NULL
)
6168 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6170 /* If there was no callback, or the callback didn't do anything,
6171 then just do a straight memcpy. */
6175 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6177 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6182 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6183 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6187 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6189 if (current_thread
== NULL
)
6192 pid
= lwpid_of (current_thread
);
6195 debug_printf ("%s siginfo for lwp %d.\n",
6196 readbuf
!= NULL
? "Reading" : "Writing",
6199 if (offset
>= sizeof (siginfo
))
6202 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6205 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6206 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6207 inferior with a 64-bit GDBSERVER should look the same as debugging it
6208 with a 32-bit GDBSERVER, we need to convert it. */
6209 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6211 if (offset
+ len
> sizeof (siginfo
))
6212 len
= sizeof (siginfo
) - offset
;
6214 if (readbuf
!= NULL
)
6215 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6218 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6220 /* Convert back to ptrace layout before flushing it out. */
6221 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6223 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6230 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6231 so we notice when children change state; as the handler for the
6232 sigsuspend in my_waitpid. */
6235 sigchld_handler (int signo
)
6237 int old_errno
= errno
;
6243 /* fprintf is not async-signal-safe, so call write
6245 if (write (2, "sigchld_handler\n",
6246 sizeof ("sigchld_handler\n") - 1) < 0)
6247 break; /* just ignore */
6251 if (target_is_async_p ())
6252 async_file_mark (); /* trigger a linux_wait */
6258 linux_supports_non_stop (void)
6264 linux_async (int enable
)
6266 int previous
= target_is_async_p ();
6269 debug_printf ("linux_async (%d), previous=%d\n",
6272 if (previous
!= enable
)
6275 sigemptyset (&mask
);
6276 sigaddset (&mask
, SIGCHLD
);
6278 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6282 if (pipe (linux_event_pipe
) == -1)
6284 linux_event_pipe
[0] = -1;
6285 linux_event_pipe
[1] = -1;
6286 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6288 warning ("creating event pipe failed.");
6292 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6293 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6295 /* Register the event loop handler. */
6296 add_file_handler (linux_event_pipe
[0],
6297 handle_target_event
, NULL
);
6299 /* Always trigger a linux_wait. */
6304 delete_file_handler (linux_event_pipe
[0]);
6306 close (linux_event_pipe
[0]);
6307 close (linux_event_pipe
[1]);
6308 linux_event_pipe
[0] = -1;
6309 linux_event_pipe
[1] = -1;
6312 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6319 linux_start_non_stop (int nonstop
)
6321 /* Register or unregister from event-loop accordingly. */
6322 linux_async (nonstop
);
6324 if (target_is_async_p () != (nonstop
!= 0))
6331 linux_supports_multi_process (void)
6336 /* Check if fork events are supported. */
6339 linux_supports_fork_events (void)
6341 return linux_supports_tracefork ();
6344 /* Check if vfork events are supported. */
6347 linux_supports_vfork_events (void)
6349 return linux_supports_tracefork ();
6352 /* Check if exec events are supported. */
6355 linux_supports_exec_events (void)
6357 return linux_supports_traceexec ();
6360 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6361 ptrace flags for all inferiors. This is in case the new GDB connection
6362 doesn't support the same set of events that the previous one did. */
6365 linux_handle_new_gdb_connection (void)
6367 /* Request that all the lwps reset their ptrace options. */
6368 for_each_thread ([] (thread_info
*thread
)
6370 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6374 /* Stop the lwp so we can modify its ptrace options. */
6375 lwp
->must_set_ptrace_flags
= 1;
6376 linux_stop_lwp (lwp
);
6380 /* Already stopped; go ahead and set the ptrace options. */
6381 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6382 int options
= linux_low_ptrace_options (proc
->attached
);
6384 linux_enable_event_reporting (lwpid_of (thread
), options
);
6385 lwp
->must_set_ptrace_flags
= 0;
6391 linux_supports_disable_randomization (void)
6393 #ifdef HAVE_PERSONALITY
6401 linux_supports_agent (void)
6407 linux_supports_range_stepping (void)
6409 if (can_software_single_step ())
6411 if (*the_low_target
.supports_range_stepping
== NULL
)
6414 return (*the_low_target
.supports_range_stepping
) ();
6417 /* Enumerate spufs IDs for process PID. */
6419 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6425 struct dirent
*entry
;
6427 sprintf (path
, "/proc/%ld/fd", pid
);
6428 dir
= opendir (path
);
6433 while ((entry
= readdir (dir
)) != NULL
)
6439 fd
= atoi (entry
->d_name
);
6443 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6444 if (stat (path
, &st
) != 0)
6446 if (!S_ISDIR (st
.st_mode
))
6449 if (statfs (path
, &stfs
) != 0)
6451 if (stfs
.f_type
!= SPUFS_MAGIC
)
6454 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6456 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6466 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6467 object type, using the /proc file system. */
6469 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6470 unsigned const char *writebuf
,
6471 CORE_ADDR offset
, int len
)
6473 long pid
= lwpid_of (current_thread
);
6478 if (!writebuf
&& !readbuf
)
6486 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6489 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6490 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6495 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6502 ret
= write (fd
, writebuf
, (size_t) len
);
6504 ret
= read (fd
, readbuf
, (size_t) len
);
6510 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6511 struct target_loadseg
6513 /* Core address to which the segment is mapped. */
6515 /* VMA recorded in the program header. */
6517 /* Size of this segment in memory. */
6521 # if defined PT_GETDSBT
6522 struct target_loadmap
6524 /* Protocol version number, must be zero. */
6526 /* Pointer to the DSBT table, its size, and the DSBT index. */
6527 unsigned *dsbt_table
;
6528 unsigned dsbt_size
, dsbt_index
;
6529 /* Number of segments in this map. */
6531 /* The actual memory map. */
6532 struct target_loadseg segs
[/*nsegs*/];
6534 # define LINUX_LOADMAP PT_GETDSBT
6535 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6536 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6538 struct target_loadmap
6540 /* Protocol version number, must be zero. */
6542 /* Number of segments in this map. */
6544 /* The actual memory map. */
6545 struct target_loadseg segs
[/*nsegs*/];
6547 # define LINUX_LOADMAP PTRACE_GETFDPIC
6548 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6549 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6553 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6554 unsigned char *myaddr
, unsigned int len
)
6556 int pid
= lwpid_of (current_thread
);
6558 struct target_loadmap
*data
= NULL
;
6559 unsigned int actual_length
, copy_length
;
6561 if (strcmp (annex
, "exec") == 0)
6562 addr
= (int) LINUX_LOADMAP_EXEC
;
6563 else if (strcmp (annex
, "interp") == 0)
6564 addr
= (int) LINUX_LOADMAP_INTERP
;
6568 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6574 actual_length
= sizeof (struct target_loadmap
)
6575 + sizeof (struct target_loadseg
) * data
->nsegs
;
6577 if (offset
< 0 || offset
> actual_length
)
6580 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6581 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6585 # define linux_read_loadmap NULL
6586 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6589 linux_process_qsupported (char **features
, int count
)
6591 if (the_low_target
.process_qsupported
!= NULL
)
6592 the_low_target
.process_qsupported (features
, count
);
6596 linux_supports_catch_syscall (void)
6598 return (the_low_target
.get_syscall_trapinfo
!= NULL
6599 && linux_supports_tracesysgood ());
6603 linux_get_ipa_tdesc_idx (void)
6605 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6608 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6612 linux_supports_tracepoints (void)
6614 if (*the_low_target
.supports_tracepoints
== NULL
)
6617 return (*the_low_target
.supports_tracepoints
) ();
6621 linux_read_pc (struct regcache
*regcache
)
6623 if (the_low_target
.get_pc
== NULL
)
6626 return (*the_low_target
.get_pc
) (regcache
);
6630 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6632 gdb_assert (the_low_target
.set_pc
!= NULL
);
6634 (*the_low_target
.set_pc
) (regcache
, pc
);
6638 linux_thread_stopped (struct thread_info
*thread
)
6640 return get_thread_lwp (thread
)->stopped
;
6643 /* This exposes stop-all-threads functionality to other modules. */
6646 linux_pause_all (int freeze
)
6648 stop_all_lwps (freeze
, NULL
);
6651 /* This exposes unstop-all-threads functionality to other gdbserver
6655 linux_unpause_all (int unfreeze
)
6657 unstop_all_lwps (unfreeze
, NULL
);
6661 linux_prepare_to_access_memory (void)
6663 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6666 linux_pause_all (1);
6671 linux_done_accessing_memory (void)
6673 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6676 linux_unpause_all (1);
6680 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6681 CORE_ADDR collector
,
6684 CORE_ADDR
*jump_entry
,
6685 CORE_ADDR
*trampoline
,
6686 ULONGEST
*trampoline_size
,
6687 unsigned char *jjump_pad_insn
,
6688 ULONGEST
*jjump_pad_insn_size
,
6689 CORE_ADDR
*adjusted_insn_addr
,
6690 CORE_ADDR
*adjusted_insn_addr_end
,
6693 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6694 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6695 jump_entry
, trampoline
, trampoline_size
,
6696 jjump_pad_insn
, jjump_pad_insn_size
,
6697 adjusted_insn_addr
, adjusted_insn_addr_end
,
6701 static struct emit_ops
*
6702 linux_emit_ops (void)
6704 if (the_low_target
.emit_ops
!= NULL
)
6705 return (*the_low_target
.emit_ops
) ();
6711 linux_get_min_fast_tracepoint_insn_len (void)
6713 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6716 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6719 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6720 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6722 char filename
[PATH_MAX
];
6724 const int auxv_size
= is_elf64
6725 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6726 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6728 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6730 fd
= open (filename
, O_RDONLY
);
6736 while (read (fd
, buf
, auxv_size
) == auxv_size
6737 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6741 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6743 switch (aux
->a_type
)
6746 *phdr_memaddr
= aux
->a_un
.a_val
;
6749 *num_phdr
= aux
->a_un
.a_val
;
6755 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6757 switch (aux
->a_type
)
6760 *phdr_memaddr
= aux
->a_un
.a_val
;
6763 *num_phdr
= aux
->a_un
.a_val
;
6771 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6773 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6774 "phdr_memaddr = %ld, phdr_num = %d",
6775 (long) *phdr_memaddr
, *num_phdr
);
6782 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6785 get_dynamic (const int pid
, const int is_elf64
)
6787 CORE_ADDR phdr_memaddr
, relocation
;
6789 unsigned char *phdr_buf
;
6790 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6792 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6795 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6796 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6798 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6801 /* Compute relocation: it is expected to be 0 for "regular" executables,
6802 non-zero for PIE ones. */
6804 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6807 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6809 if (p
->p_type
== PT_PHDR
)
6810 relocation
= phdr_memaddr
- p
->p_vaddr
;
6814 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6816 if (p
->p_type
== PT_PHDR
)
6817 relocation
= phdr_memaddr
- p
->p_vaddr
;
6820 if (relocation
== -1)
6822 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6823 any real world executables, including PIE executables, have always
6824 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6825 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6826 or present DT_DEBUG anyway (fpc binaries are statically linked).
6828 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6830 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6835 for (i
= 0; i
< num_phdr
; i
++)
6839 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6841 if (p
->p_type
== PT_DYNAMIC
)
6842 return p
->p_vaddr
+ relocation
;
6846 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6848 if (p
->p_type
== PT_DYNAMIC
)
6849 return p
->p_vaddr
+ relocation
;
6856 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6857 can be 0 if the inferior does not yet have the library list initialized.
6858 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6859 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6862 get_r_debug (const int pid
, const int is_elf64
)
6864 CORE_ADDR dynamic_memaddr
;
6865 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6866 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6869 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6870 if (dynamic_memaddr
== 0)
6873 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6877 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6878 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6882 unsigned char buf
[sizeof (Elf64_Xword
)];
6886 #ifdef DT_MIPS_RLD_MAP
6887 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6889 if (linux_read_memory (dyn
->d_un
.d_val
,
6890 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6895 #endif /* DT_MIPS_RLD_MAP */
6896 #ifdef DT_MIPS_RLD_MAP_REL
6897 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6899 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6900 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6905 #endif /* DT_MIPS_RLD_MAP_REL */
6907 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6908 map
= dyn
->d_un
.d_val
;
6910 if (dyn
->d_tag
== DT_NULL
)
6915 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6916 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6920 unsigned char buf
[sizeof (Elf32_Word
)];
6924 #ifdef DT_MIPS_RLD_MAP
6925 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6927 if (linux_read_memory (dyn
->d_un
.d_val
,
6928 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6933 #endif /* DT_MIPS_RLD_MAP */
6934 #ifdef DT_MIPS_RLD_MAP_REL
6935 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6937 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6938 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6943 #endif /* DT_MIPS_RLD_MAP_REL */
6945 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6946 map
= dyn
->d_un
.d_val
;
6948 if (dyn
->d_tag
== DT_NULL
)
6952 dynamic_memaddr
+= dyn_size
;
6958 /* Read one pointer from MEMADDR in the inferior. */
6961 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6965 /* Go through a union so this works on either big or little endian
6966 hosts, when the inferior's pointer size is smaller than the size
6967 of CORE_ADDR. It is assumed the inferior's endianness is the
6968 same of the superior's. */
6971 CORE_ADDR core_addr
;
6976 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6979 if (ptr_size
== sizeof (CORE_ADDR
))
6980 *ptr
= addr
.core_addr
;
6981 else if (ptr_size
== sizeof (unsigned int))
6984 gdb_assert_not_reached ("unhandled pointer size");
6989 struct link_map_offsets
6991 /* Offset and size of r_debug.r_version. */
6992 int r_version_offset
;
6994 /* Offset and size of r_debug.r_map. */
6997 /* Offset to l_addr field in struct link_map. */
7000 /* Offset to l_name field in struct link_map. */
7003 /* Offset to l_ld field in struct link_map. */
7006 /* Offset to l_next field in struct link_map. */
7009 /* Offset to l_prev field in struct link_map. */
7013 /* Construct qXfer:libraries-svr4:read reply. */
7016 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
7017 unsigned const char *writebuf
,
7018 CORE_ADDR offset
, int len
)
7021 unsigned document_len
;
7022 struct process_info_private
*const priv
= current_process ()->priv
;
7023 char filename
[PATH_MAX
];
7026 static const struct link_map_offsets lmo_32bit_offsets
=
7028 0, /* r_version offset. */
7029 4, /* r_debug.r_map offset. */
7030 0, /* l_addr offset in link_map. */
7031 4, /* l_name offset in link_map. */
7032 8, /* l_ld offset in link_map. */
7033 12, /* l_next offset in link_map. */
7034 16 /* l_prev offset in link_map. */
7037 static const struct link_map_offsets lmo_64bit_offsets
=
7039 0, /* r_version offset. */
7040 8, /* r_debug.r_map offset. */
7041 0, /* l_addr offset in link_map. */
7042 8, /* l_name offset in link_map. */
7043 16, /* l_ld offset in link_map. */
7044 24, /* l_next offset in link_map. */
7045 32 /* l_prev offset in link_map. */
7047 const struct link_map_offsets
*lmo
;
7048 unsigned int machine
;
7050 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7051 int allocated
= 1024;
7053 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7054 int header_done
= 0;
7056 if (writebuf
!= NULL
)
7058 if (readbuf
== NULL
)
7061 pid
= lwpid_of (current_thread
);
7062 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7063 is_elf64
= elf_64_file_p (filename
, &machine
);
7064 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7065 ptr_size
= is_elf64
? 8 : 4;
7067 while (annex
[0] != '\0')
7073 sep
= strchr (annex
, '=');
7078 if (len
== 5 && startswith (annex
, "start"))
7080 else if (len
== 4 && startswith (annex
, "prev"))
7084 annex
= strchr (sep
, ';');
7091 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7098 if (priv
->r_debug
== 0)
7099 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7101 /* We failed to find DT_DEBUG. Such situation will not change
7102 for this inferior - do not retry it. Report it to GDB as
7103 E01, see for the reasons at the GDB solib-svr4.c side. */
7104 if (priv
->r_debug
== (CORE_ADDR
) -1)
7107 if (priv
->r_debug
!= 0)
7109 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7110 (unsigned char *) &r_version
,
7111 sizeof (r_version
)) != 0
7114 warning ("unexpected r_debug version %d", r_version
);
7116 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7117 &lm_addr
, ptr_size
) != 0)
7119 warning ("unable to read r_map from 0x%lx",
7120 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7125 document
= (char *) xmalloc (allocated
);
7126 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7127 p
= document
+ strlen (document
);
7130 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7131 &l_name
, ptr_size
) == 0
7132 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7133 &l_addr
, ptr_size
) == 0
7134 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7135 &l_ld
, ptr_size
) == 0
7136 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7137 &l_prev
, ptr_size
) == 0
7138 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7139 &l_next
, ptr_size
) == 0)
7141 unsigned char libname
[PATH_MAX
];
7143 if (lm_prev
!= l_prev
)
7145 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7146 (long) lm_prev
, (long) l_prev
);
7150 /* Ignore the first entry even if it has valid name as the first entry
7151 corresponds to the main executable. The first entry should not be
7152 skipped if the dynamic loader was loaded late by a static executable
7153 (see solib-svr4.c parameter ignore_first). But in such case the main
7154 executable does not have PT_DYNAMIC present and this function already
7155 exited above due to failed get_r_debug. */
7158 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7163 /* Not checking for error because reading may stop before
7164 we've got PATH_MAX worth of characters. */
7166 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7167 libname
[sizeof (libname
) - 1] = '\0';
7168 if (libname
[0] != '\0')
7170 /* 6x the size for xml_escape_text below. */
7171 size_t len
= 6 * strlen ((char *) libname
);
7175 /* Terminate `<library-list-svr4'. */
7180 while (allocated
< p
- document
+ len
+ 200)
7182 /* Expand to guarantee sufficient storage. */
7183 uintptr_t document_len
= p
- document
;
7185 document
= (char *) xrealloc (document
, 2 * allocated
);
7187 p
= document
+ document_len
;
7190 std::string name
= xml_escape_text ((char *) libname
);
7191 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7192 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7193 name
.c_str (), (unsigned long) lm_addr
,
7194 (unsigned long) l_addr
, (unsigned long) l_ld
);
7204 /* Empty list; terminate `<library-list-svr4'. */
7208 strcpy (p
, "</library-list-svr4>");
7210 document_len
= strlen (document
);
7211 if (offset
< document_len
)
7212 document_len
-= offset
;
7215 if (len
> document_len
)
7218 memcpy (readbuf
, document
+ offset
, len
);
7224 #ifdef HAVE_LINUX_BTRACE
7226 /* See to_disable_btrace target method. */
7229 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7231 enum btrace_error err
;
7233 err
= linux_disable_btrace (tinfo
);
7234 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7237 /* Encode an Intel Processor Trace configuration. */
7240 linux_low_encode_pt_config (struct buffer
*buffer
,
7241 const struct btrace_data_pt_config
*config
)
7243 buffer_grow_str (buffer
, "<pt-config>\n");
7245 switch (config
->cpu
.vendor
)
7248 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7249 "model=\"%u\" stepping=\"%u\"/>\n",
7250 config
->cpu
.family
, config
->cpu
.model
,
7251 config
->cpu
.stepping
);
7258 buffer_grow_str (buffer
, "</pt-config>\n");
7261 /* Encode a raw buffer. */
7264 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7270 /* We use hex encoding - see common/rsp-low.h. */
7271 buffer_grow_str (buffer
, "<raw>\n");
7277 elem
[0] = tohex ((*data
>> 4) & 0xf);
7278 elem
[1] = tohex (*data
++ & 0xf);
7280 buffer_grow (buffer
, elem
, 2);
7283 buffer_grow_str (buffer
, "</raw>\n");
7286 /* See to_read_btrace target method. */
7289 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7290 enum btrace_read_type type
)
7292 struct btrace_data btrace
;
7293 struct btrace_block
*block
;
7294 enum btrace_error err
;
7297 btrace_data_init (&btrace
);
7299 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7300 if (err
!= BTRACE_ERR_NONE
)
7302 if (err
== BTRACE_ERR_OVERFLOW
)
7303 buffer_grow_str0 (buffer
, "E.Overflow.");
7305 buffer_grow_str0 (buffer
, "E.Generic Error.");
7310 switch (btrace
.format
)
7312 case BTRACE_FORMAT_NONE
:
7313 buffer_grow_str0 (buffer
, "E.No Trace.");
7316 case BTRACE_FORMAT_BTS
:
7317 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7318 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7321 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7323 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7324 paddress (block
->begin
), paddress (block
->end
));
7326 buffer_grow_str0 (buffer
, "</btrace>\n");
7329 case BTRACE_FORMAT_PT
:
7330 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7331 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7332 buffer_grow_str (buffer
, "<pt>\n");
7334 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7336 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7337 btrace
.variant
.pt
.size
);
7339 buffer_grow_str (buffer
, "</pt>\n");
7340 buffer_grow_str0 (buffer
, "</btrace>\n");
7344 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7348 btrace_data_fini (&btrace
);
7352 btrace_data_fini (&btrace
);
7356 /* See to_btrace_conf target method. */
7359 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7360 struct buffer
*buffer
)
7362 const struct btrace_config
*conf
;
7364 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7365 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7367 conf
= linux_btrace_conf (tinfo
);
7370 switch (conf
->format
)
7372 case BTRACE_FORMAT_NONE
:
7375 case BTRACE_FORMAT_BTS
:
7376 buffer_xml_printf (buffer
, "<bts");
7377 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7378 buffer_xml_printf (buffer
, " />\n");
7381 case BTRACE_FORMAT_PT
:
7382 buffer_xml_printf (buffer
, "<pt");
7383 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7384 buffer_xml_printf (buffer
, "/>\n");
7389 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7392 #endif /* HAVE_LINUX_BTRACE */
7394 /* See nat/linux-nat.h. */
7397 current_lwp_ptid (void)
7399 return ptid_of (current_thread
);
7402 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7405 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7407 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7408 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7410 return default_breakpoint_kind_from_pc (pcptr
);
7413 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7415 static const gdb_byte
*
7416 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7418 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7420 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7423 /* Implementation of the target_ops method
7424 "breakpoint_kind_from_current_state". */
7427 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7429 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7430 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7432 return linux_breakpoint_kind_from_pc (pcptr
);
7435 /* Default implementation of linux_target_ops method "set_pc" for
7436 32-bit pc register which is literally named "pc". */
7439 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7441 uint32_t newpc
= pc
;
7443 supply_register_by_name (regcache
, "pc", &newpc
);
7446 /* Default implementation of linux_target_ops method "get_pc" for
7447 32-bit pc register which is literally named "pc". */
7450 linux_get_pc_32bit (struct regcache
*regcache
)
7454 collect_register_by_name (regcache
, "pc", &pc
);
7456 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7460 /* Default implementation of linux_target_ops method "set_pc" for
7461 64-bit pc register which is literally named "pc". */
7464 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7466 uint64_t newpc
= pc
;
7468 supply_register_by_name (regcache
, "pc", &newpc
);
7471 /* Default implementation of linux_target_ops method "get_pc" for
7472 64-bit pc register which is literally named "pc". */
7475 linux_get_pc_64bit (struct regcache
*regcache
)
7479 collect_register_by_name (regcache
, "pc", &pc
);
7481 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7486 static struct target_ops linux_target_ops
= {
7487 linux_create_inferior
,
7488 linux_post_create_inferior
,
7497 linux_fetch_registers
,
7498 linux_store_registers
,
7499 linux_prepare_to_access_memory
,
7500 linux_done_accessing_memory
,
7503 linux_look_up_symbols
,
7504 linux_request_interrupt
,
7506 linux_supports_z_point_type
,
7509 linux_stopped_by_sw_breakpoint
,
7510 linux_supports_stopped_by_sw_breakpoint
,
7511 linux_stopped_by_hw_breakpoint
,
7512 linux_supports_stopped_by_hw_breakpoint
,
7513 linux_supports_hardware_single_step
,
7514 linux_stopped_by_watchpoint
,
7515 linux_stopped_data_address
,
7516 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7517 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7518 && defined(PT_TEXT_END_ADDR)
7523 #ifdef USE_THREAD_DB
7524 thread_db_get_tls_address
,
7529 hostio_last_error_from_errno
,
7532 linux_supports_non_stop
,
7534 linux_start_non_stop
,
7535 linux_supports_multi_process
,
7536 linux_supports_fork_events
,
7537 linux_supports_vfork_events
,
7538 linux_supports_exec_events
,
7539 linux_handle_new_gdb_connection
,
7540 #ifdef USE_THREAD_DB
7541 thread_db_handle_monitor_command
,
7545 linux_common_core_of_thread
,
7547 linux_process_qsupported
,
7548 linux_supports_tracepoints
,
7551 linux_thread_stopped
,
7555 linux_stabilize_threads
,
7556 linux_install_fast_tracepoint_jump_pad
,
7558 linux_supports_disable_randomization
,
7559 linux_get_min_fast_tracepoint_insn_len
,
7560 linux_qxfer_libraries_svr4
,
7561 linux_supports_agent
,
7562 #ifdef HAVE_LINUX_BTRACE
7563 linux_supports_btrace
,
7564 linux_enable_btrace
,
7565 linux_low_disable_btrace
,
7566 linux_low_read_btrace
,
7567 linux_low_btrace_conf
,
7575 linux_supports_range_stepping
,
7576 linux_proc_pid_to_exec_file
,
7577 linux_mntns_open_cloexec
,
7579 linux_mntns_readlink
,
7580 linux_breakpoint_kind_from_pc
,
7581 linux_sw_breakpoint_from_kind
,
7582 linux_proc_tid_get_name
,
7583 linux_breakpoint_kind_from_current_state
,
7584 linux_supports_software_single_step
,
7585 linux_supports_catch_syscall
,
7586 linux_get_ipa_tdesc_idx
,
7588 thread_db_thread_handle
,
7594 #ifdef HAVE_LINUX_REGSETS
7596 initialize_regsets_info (struct regsets_info
*info
)
7598 for (info
->num_regsets
= 0;
7599 info
->regsets
[info
->num_regsets
].size
>= 0;
7600 info
->num_regsets
++)
7606 initialize_low (void)
7608 struct sigaction sigchld_action
;
7610 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7611 set_target_ops (&linux_target_ops
);
7613 linux_ptrace_init_warnings ();
7615 sigchld_action
.sa_handler
= sigchld_handler
;
7616 sigemptyset (&sigchld_action
.sa_mask
);
7617 sigchld_action
.sa_flags
= SA_RESTART
;
7618 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7620 initialize_low_arch ();
7622 linux_check_ptrace_features ();