1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2018 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "linux-low.h"
21 #include "nat/linux-osdata.h"
25 #include "signals-state-save-restore.h"
26 #include "nat/linux-nat.h"
27 #include "nat/linux-waitpid.h"
29 #include "nat/gdb_ptrace.h"
30 #include "nat/linux-ptrace.h"
31 #include "nat/linux-procfs.h"
32 #include "nat/linux-personality.h"
34 #include <sys/ioctl.h>
37 #include <sys/syscall.h>
41 #include <sys/types.h>
46 #include "filestuff.h"
47 #include "tracepoint.h"
50 #include "common-inferior.h"
51 #include "nat/fork-inferior.h"
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 void proceed_one_lwp (thread_info
*thread
, lwp_info
*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
;
665 thread_db_notice_clone (event_thr
, ptid
);
668 /* Don't report the event. */
671 else if (event
== PTRACE_EVENT_VFORK_DONE
)
673 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
675 if (event_lwp
->bp_reinsert
!= 0 && can_software_single_step ())
677 reinsert_single_step_breakpoints (event_thr
);
679 gdb_assert (has_single_step_breakpoints (event_thr
));
682 /* Report the event. */
685 else if (event
== PTRACE_EVENT_EXEC
&& report_exec_events
)
687 struct process_info
*proc
;
688 std::vector
<int> syscalls_to_catch
;
694 debug_printf ("HEW: Got exec event from LWP %ld\n",
695 lwpid_of (event_thr
));
698 /* Get the event ptid. */
699 event_ptid
= ptid_of (event_thr
);
700 event_pid
= ptid_get_pid (event_ptid
);
702 /* Save the syscall list from the execing process. */
703 proc
= get_thread_process (event_thr
);
704 syscalls_to_catch
= std::move (proc
->syscalls_to_catch
);
706 /* Delete the execing process and all its threads. */
708 current_thread
= NULL
;
710 /* Create a new process/lwp/thread. */
711 proc
= linux_add_process (event_pid
, 0);
712 event_lwp
= add_lwp (event_ptid
);
713 event_thr
= get_lwp_thread (event_lwp
);
714 gdb_assert (current_thread
== event_thr
);
715 linux_arch_setup_thread (event_thr
);
717 /* Set the event status. */
718 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
719 event_lwp
->waitstatus
.value
.execd_pathname
720 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
722 /* Mark the exec status as pending. */
723 event_lwp
->stopped
= 1;
724 event_lwp
->status_pending_p
= 1;
725 event_lwp
->status_pending
= wstat
;
726 event_thr
->last_resume_kind
= resume_continue
;
727 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
729 /* Update syscall state in the new lwp, effectively mid-syscall too. */
730 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
732 /* Restore the list to catch. Don't rely on the client, which is free
733 to avoid sending a new list when the architecture doesn't change.
734 Also, for ANY_SYSCALL, the architecture doesn't really matter. */
735 proc
->syscalls_to_catch
= std::move (syscalls_to_catch
);
737 /* Report the event. */
738 *orig_event_lwp
= event_lwp
;
742 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
745 /* Return the PC as read from the regcache of LWP, without any
749 get_pc (struct lwp_info
*lwp
)
751 struct thread_info
*saved_thread
;
752 struct regcache
*regcache
;
755 if (the_low_target
.get_pc
== NULL
)
758 saved_thread
= current_thread
;
759 current_thread
= get_lwp_thread (lwp
);
761 regcache
= get_thread_regcache (current_thread
, 1);
762 pc
= (*the_low_target
.get_pc
) (regcache
);
765 debug_printf ("pc is 0x%lx\n", (long) pc
);
767 current_thread
= saved_thread
;
771 /* This function should only be called if LWP got a SYSCALL_SIGTRAP.
772 Fill *SYSNO with the syscall nr trapped. */
775 get_syscall_trapinfo (struct lwp_info
*lwp
, int *sysno
)
777 struct thread_info
*saved_thread
;
778 struct regcache
*regcache
;
780 if (the_low_target
.get_syscall_trapinfo
== NULL
)
782 /* If we cannot get the syscall trapinfo, report an unknown
783 system call number. */
784 *sysno
= UNKNOWN_SYSCALL
;
788 saved_thread
= current_thread
;
789 current_thread
= get_lwp_thread (lwp
);
791 regcache
= get_thread_regcache (current_thread
, 1);
792 (*the_low_target
.get_syscall_trapinfo
) (regcache
, sysno
);
795 debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno
);
797 current_thread
= saved_thread
;
800 static int check_stopped_by_watchpoint (struct lwp_info
*child
);
802 /* Called when the LWP stopped for a signal/trap. If it stopped for a
803 trap check what caused it (breakpoint, watchpoint, trace, etc.),
804 and save the result in the LWP's stop_reason field. If it stopped
805 for a breakpoint, decrement the PC if necessary on the lwp's
806 architecture. Returns true if we now have the LWP's stop PC. */
809 save_stop_reason (struct lwp_info
*lwp
)
812 CORE_ADDR sw_breakpoint_pc
;
813 struct thread_info
*saved_thread
;
814 #if USE_SIGTRAP_SIGINFO
818 if (the_low_target
.get_pc
== NULL
)
822 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
824 /* breakpoint_at reads from the current thread. */
825 saved_thread
= current_thread
;
826 current_thread
= get_lwp_thread (lwp
);
828 #if USE_SIGTRAP_SIGINFO
829 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
830 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
832 if (siginfo
.si_signo
== SIGTRAP
)
834 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
)
835 && GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
837 /* The si_code is ambiguous on this arch -- check debug
839 if (!check_stopped_by_watchpoint (lwp
))
840 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
842 else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
844 /* If we determine the LWP stopped for a SW breakpoint,
845 trust it. Particularly don't check watchpoint
846 registers, because at least on s390, we'd find
847 stopped-by-watchpoint as long as there's a watchpoint
849 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
851 else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
853 /* This can indicate either a hardware breakpoint or
854 hardware watchpoint. Check debug registers. */
855 if (!check_stopped_by_watchpoint (lwp
))
856 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
858 else if (siginfo
.si_code
== TRAP_TRACE
)
860 /* We may have single stepped an instruction that
861 triggered a watchpoint. In that case, on some
862 architectures (such as x86), instead of TRAP_HWBKPT,
863 si_code indicates TRAP_TRACE, and we need to check
864 the debug registers separately. */
865 if (!check_stopped_by_watchpoint (lwp
))
866 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
871 /* We may have just stepped a breakpoint instruction. E.g., in
872 non-stop mode, GDB first tells the thread A to step a range, and
873 then the user inserts a breakpoint inside the range. In that
874 case we need to report the breakpoint PC. */
875 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
876 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
877 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
879 if (hardware_breakpoint_inserted_here (pc
))
880 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
882 if (lwp
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
)
883 check_stopped_by_watchpoint (lwp
);
886 if (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
890 struct thread_info
*thr
= get_lwp_thread (lwp
);
892 debug_printf ("CSBB: %s stopped by software breakpoint\n",
893 target_pid_to_str (ptid_of (thr
)));
896 /* Back up the PC if necessary. */
897 if (pc
!= sw_breakpoint_pc
)
899 struct regcache
*regcache
900 = get_thread_regcache (current_thread
, 1);
901 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
904 /* Update this so we record the correct stop PC below. */
905 pc
= sw_breakpoint_pc
;
907 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
)
911 struct thread_info
*thr
= get_lwp_thread (lwp
);
913 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
914 target_pid_to_str (ptid_of (thr
)));
917 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
921 struct thread_info
*thr
= get_lwp_thread (lwp
);
923 debug_printf ("CSBB: %s stopped by hardware watchpoint\n",
924 target_pid_to_str (ptid_of (thr
)));
927 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
)
931 struct thread_info
*thr
= get_lwp_thread (lwp
);
933 debug_printf ("CSBB: %s stopped by trace\n",
934 target_pid_to_str (ptid_of (thr
)));
939 current_thread
= saved_thread
;
943 static struct lwp_info
*
944 add_lwp (ptid_t ptid
)
946 struct lwp_info
*lwp
;
948 lwp
= XCNEW (struct lwp_info
);
950 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
952 if (the_low_target
.new_thread
!= NULL
)
953 the_low_target
.new_thread (lwp
);
955 lwp
->thread
= add_thread (ptid
, lwp
);
960 /* Callback to be used when calling fork_inferior, responsible for
961 actually initiating the tracing of the inferior. */
966 if (ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0,
967 (PTRACE_TYPE_ARG4
) 0) < 0)
968 trace_start_error_with_name ("ptrace");
970 if (setpgid (0, 0) < 0)
971 trace_start_error_with_name ("setpgid");
973 /* If GDBserver is connected to gdb via stdio, redirect the inferior's
974 stdout to stderr so that inferior i/o doesn't corrupt the connection.
975 Also, redirect stdin to /dev/null. */
976 if (remote_connection_is_stdio ())
979 trace_start_error_with_name ("close");
980 if (open ("/dev/null", O_RDONLY
) < 0)
981 trace_start_error_with_name ("open");
983 trace_start_error_with_name ("dup2");
984 if (write (2, "stdin/stdout redirected\n",
985 sizeof ("stdin/stdout redirected\n") - 1) < 0)
987 /* Errors ignored. */;
992 /* Start an inferior process and returns its pid.
993 PROGRAM is the name of the program to be started, and PROGRAM_ARGS
994 are its arguments. */
997 linux_create_inferior (const char *program
,
998 const std::vector
<char *> &program_args
)
1000 struct lwp_info
*new_lwp
;
1005 maybe_disable_address_space_randomization restore_personality
1006 (disable_randomization
);
1007 std::string str_program_args
= stringify_argv (program_args
);
1009 pid
= fork_inferior (program
,
1010 str_program_args
.c_str (),
1011 get_environ ()->envp (), linux_ptrace_fun
,
1012 NULL
, NULL
, NULL
, NULL
);
1015 linux_add_process (pid
, 0);
1017 ptid
= ptid_build (pid
, pid
, 0);
1018 new_lwp
= add_lwp (ptid
);
1019 new_lwp
->must_set_ptrace_flags
= 1;
1021 post_fork_inferior (pid
, program
);
1026 /* Implement the post_create_inferior target_ops method. */
1029 linux_post_create_inferior (void)
1031 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
1033 linux_arch_setup ();
1035 if (lwp
->must_set_ptrace_flags
)
1037 struct process_info
*proc
= current_process ();
1038 int options
= linux_low_ptrace_options (proc
->attached
);
1040 linux_enable_event_reporting (lwpid_of (current_thread
), options
);
1041 lwp
->must_set_ptrace_flags
= 0;
1045 /* Attach to an inferior process. Returns 0 on success, ERRNO on
1049 linux_attach_lwp (ptid_t ptid
)
1051 struct lwp_info
*new_lwp
;
1052 int lwpid
= ptid_get_lwp (ptid
);
1054 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
1058 new_lwp
= add_lwp (ptid
);
1060 /* We need to wait for SIGSTOP before being able to make the next
1061 ptrace call on this LWP. */
1062 new_lwp
->must_set_ptrace_flags
= 1;
1064 if (linux_proc_pid_is_stopped (lwpid
))
1067 debug_printf ("Attached to a stopped process\n");
1069 /* The process is definitely stopped. It is in a job control
1070 stop, unless the kernel predates the TASK_STOPPED /
1071 TASK_TRACED distinction, in which case it might be in a
1072 ptrace stop. Make sure it is in a ptrace stop; from there we
1073 can kill it, signal it, et cetera.
1075 First make sure there is a pending SIGSTOP. Since we are
1076 already attached, the process can not transition from stopped
1077 to running without a PTRACE_CONT; so we know this signal will
1078 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1079 probably already in the queue (unless this kernel is old
1080 enough to use TASK_STOPPED for ptrace stops); but since
1081 SIGSTOP is not an RT signal, it can only be queued once. */
1082 kill_lwp (lwpid
, SIGSTOP
);
1084 /* Finally, resume the stopped process. This will deliver the
1085 SIGSTOP (or a higher priority signal, just like normal
1086 PTRACE_ATTACH), which we'll catch later on. */
1087 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1090 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
1091 brings it to a halt.
1093 There are several cases to consider here:
1095 1) gdbserver has already attached to the process and is being notified
1096 of a new thread that is being created.
1097 In this case we should ignore that SIGSTOP and resume the
1098 process. This is handled below by setting stop_expected = 1,
1099 and the fact that add_thread sets last_resume_kind ==
1102 2) This is the first thread (the process thread), and we're attaching
1103 to it via attach_inferior.
1104 In this case we want the process thread to stop.
1105 This is handled by having linux_attach set last_resume_kind ==
1106 resume_stop after we return.
1108 If the pid we are attaching to is also the tgid, we attach to and
1109 stop all the existing threads. Otherwise, we attach to pid and
1110 ignore any other threads in the same group as this pid.
1112 3) GDB is connecting to gdbserver and is requesting an enumeration of all
1114 In this case we want the thread to stop.
1115 FIXME: This case is currently not properly handled.
1116 We should wait for the SIGSTOP but don't. Things work apparently
1117 because enough time passes between when we ptrace (ATTACH) and when
1118 gdb makes the next ptrace call on the thread.
1120 On the other hand, if we are currently trying to stop all threads, we
1121 should treat the new thread as if we had sent it a SIGSTOP. This works
1122 because we are guaranteed that the add_lwp call above added us to the
1123 end of the list, and so the new thread has not yet reached
1124 wait_for_sigstop (but will). */
1125 new_lwp
->stop_expected
= 1;
1130 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
1131 already attached. Returns true if a new LWP is found, false
1135 attach_proc_task_lwp_callback (ptid_t ptid
)
1137 /* Is this a new thread? */
1138 if (find_thread_ptid (ptid
) == NULL
)
1140 int lwpid
= ptid_get_lwp (ptid
);
1144 debug_printf ("Found new lwp %d\n", lwpid
);
1146 err
= linux_attach_lwp (ptid
);
1148 /* Be quiet if we simply raced with the thread exiting. EPERM
1149 is returned if the thread's task still exists, and is marked
1150 as exited or zombie, as well as other conditions, so in that
1151 case, confirm the status in /proc/PID/status. */
1153 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1157 debug_printf ("Cannot attach to lwp %d: "
1158 "thread is gone (%d: %s)\n",
1159 lwpid
, err
, strerror (err
));
1165 = linux_ptrace_attach_fail_reason_string (ptid
, err
);
1167 warning (_("Cannot attach to lwp %d: %s"), lwpid
, reason
.c_str ());
1175 static void async_file_mark (void);
1177 /* Attach to PID. If PID is the tgid, attach to it and all
1181 linux_attach (unsigned long pid
)
1183 struct process_info
*proc
;
1184 struct thread_info
*initial_thread
;
1185 ptid_t ptid
= ptid_build (pid
, pid
, 0);
1188 /* Attach to PID. We will check for other threads
1190 err
= linux_attach_lwp (ptid
);
1193 std::string reason
= linux_ptrace_attach_fail_reason_string (ptid
, err
);
1195 error ("Cannot attach to process %ld: %s", pid
, reason
.c_str ());
1198 proc
= linux_add_process (pid
, 1);
1200 /* Don't ignore the initial SIGSTOP if we just attached to this
1201 process. It will be collected by wait shortly. */
1202 initial_thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
1203 initial_thread
->last_resume_kind
= resume_stop
;
1205 /* We must attach to every LWP. If /proc is mounted, use that to
1206 find them now. On the one hand, the inferior may be using raw
1207 clone instead of using pthreads. On the other hand, even if it
1208 is using pthreads, GDB may not be connected yet (thread_db needs
1209 to do symbol lookups, through qSymbol). Also, thread_db walks
1210 structures in the inferior's address space to find the list of
1211 threads/LWPs, and those structures may well be corrupted. Note
1212 that once thread_db is loaded, we'll still use it to list threads
1213 and associate pthread info with each LWP. */
1214 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1216 /* GDB will shortly read the xml target description for this
1217 process, to figure out the process' architecture. But the target
1218 description is only filled in when the first process/thread in
1219 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1220 that now, otherwise, if GDB is fast enough, it could read the
1221 target description _before_ that initial stop. */
1224 struct lwp_info
*lwp
;
1226 ptid_t pid_ptid
= pid_to_ptid (pid
);
1228 lwpid
= linux_wait_for_event_filtered (pid_ptid
, pid_ptid
,
1230 gdb_assert (lwpid
> 0);
1232 lwp
= find_lwp_pid (pid_to_ptid (lwpid
));
1234 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGSTOP
)
1236 lwp
->status_pending_p
= 1;
1237 lwp
->status_pending
= wstat
;
1240 initial_thread
->last_resume_kind
= resume_continue
;
1244 gdb_assert (proc
->tdesc
!= NULL
);
1251 last_thread_of_process_p (int pid
)
1253 bool seen_one
= false;
1255 thread_info
*thread
= find_thread (pid
, [&] (thread_info
*thread
)
1259 /* This is the first thread of this process we see. */
1265 /* This is the second thread of this process we see. */
1270 return thread
== NULL
;
1276 linux_kill_one_lwp (struct lwp_info
*lwp
)
1278 struct thread_info
*thr
= get_lwp_thread (lwp
);
1279 int pid
= lwpid_of (thr
);
1281 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1282 there is no signal context, and ptrace(PTRACE_KILL) (or
1283 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1284 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1285 alternative is to kill with SIGKILL. We only need one SIGKILL
1286 per process, not one for each thread. But since we still support
1287 support debugging programs using raw clone without CLONE_THREAD,
1288 we send one for each thread. For years, we used PTRACE_KILL
1289 only, so we're being a bit paranoid about some old kernels where
1290 PTRACE_KILL might work better (dubious if there are any such, but
1291 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1292 second, and so we're fine everywhere. */
1295 kill_lwp (pid
, SIGKILL
);
1298 int save_errno
= errno
;
1300 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1301 target_pid_to_str (ptid_of (thr
)),
1302 save_errno
? strerror (save_errno
) : "OK");
1306 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1309 int save_errno
= errno
;
1311 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1312 target_pid_to_str (ptid_of (thr
)),
1313 save_errno
? strerror (save_errno
) : "OK");
1317 /* Kill LWP and wait for it to die. */
1320 kill_wait_lwp (struct lwp_info
*lwp
)
1322 struct thread_info
*thr
= get_lwp_thread (lwp
);
1323 int pid
= ptid_get_pid (ptid_of (thr
));
1324 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1329 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1333 linux_kill_one_lwp (lwp
);
1335 /* Make sure it died. Notes:
1337 - The loop is most likely unnecessary.
1339 - We don't use linux_wait_for_event as that could delete lwps
1340 while we're iterating over them. We're not interested in
1341 any pending status at this point, only in making sure all
1342 wait status on the kernel side are collected until the
1345 - We don't use __WALL here as the __WALL emulation relies on
1346 SIGCHLD, and killing a stopped process doesn't generate
1347 one, nor an exit status.
1349 res
= my_waitpid (lwpid
, &wstat
, 0);
1350 if (res
== -1 && errno
== ECHILD
)
1351 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1352 } while (res
> 0 && WIFSTOPPED (wstat
));
1354 /* Even if it was stopped, the child may have already disappeared.
1355 E.g., if it was killed by SIGKILL. */
1356 if (res
< 0 && errno
!= ECHILD
)
1357 perror_with_name ("kill_wait_lwp");
1360 /* Callback for `for_each_thread'. Kills an lwp of a given process,
1361 except the leader. */
1364 kill_one_lwp_callback (thread_info
*thread
, int pid
)
1366 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1368 /* We avoid killing the first thread here, because of a Linux kernel (at
1369 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1370 the children get a chance to be reaped, it will remain a zombie
1373 if (lwpid_of (thread
) == pid
)
1376 debug_printf ("lkop: is last of process %s\n",
1377 target_pid_to_str (thread
->id
));
1381 kill_wait_lwp (lwp
);
1385 linux_kill (int pid
)
1387 struct process_info
*process
;
1388 struct lwp_info
*lwp
;
1390 process
= find_process_pid (pid
);
1391 if (process
== NULL
)
1394 /* If we're killing a running inferior, make sure it is stopped
1395 first, as PTRACE_KILL will not work otherwise. */
1396 stop_all_lwps (0, NULL
);
1398 for_each_thread (pid
, [&] (thread_info
*thread
)
1400 kill_one_lwp_callback (thread
, pid
);
1403 /* See the comment in linux_kill_one_lwp. We did not kill the first
1404 thread in the list, so do so now. */
1405 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1410 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1414 kill_wait_lwp (lwp
);
1416 the_target
->mourn (process
);
1418 /* Since we presently can only stop all lwps of all processes, we
1419 need to unstop lwps of other processes. */
1420 unstop_all_lwps (0, NULL
);
1424 /* Get pending signal of THREAD, for detaching purposes. This is the
1425 signal the thread last stopped for, which we need to deliver to the
1426 thread when detaching, otherwise, it'd be suppressed/lost. */
1429 get_detach_signal (struct thread_info
*thread
)
1431 enum gdb_signal signo
= GDB_SIGNAL_0
;
1433 struct lwp_info
*lp
= get_thread_lwp (thread
);
1435 if (lp
->status_pending_p
)
1436 status
= lp
->status_pending
;
1439 /* If the thread had been suspended by gdbserver, and it stopped
1440 cleanly, then it'll have stopped with SIGSTOP. But we don't
1441 want to deliver that SIGSTOP. */
1442 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1443 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1446 /* Otherwise, we may need to deliver the signal we
1448 status
= lp
->last_status
;
1451 if (!WIFSTOPPED (status
))
1454 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1455 target_pid_to_str (ptid_of (thread
)));
1459 /* Extended wait statuses aren't real SIGTRAPs. */
1460 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1463 debug_printf ("GPS: lwp %s had stopped with extended "
1464 "status: no pending signal\n",
1465 target_pid_to_str (ptid_of (thread
)));
1469 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1471 if (program_signals_p
&& !program_signals
[signo
])
1474 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1475 target_pid_to_str (ptid_of (thread
)),
1476 gdb_signal_to_string (signo
));
1479 else if (!program_signals_p
1480 /* If we have no way to know which signals GDB does not
1481 want to have passed to the program, assume
1482 SIGTRAP/SIGINT, which is GDB's default. */
1483 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1486 debug_printf ("GPS: lwp %s had signal %s, "
1487 "but we don't know if we should pass it. "
1488 "Default to not.\n",
1489 target_pid_to_str (ptid_of (thread
)),
1490 gdb_signal_to_string (signo
));
1496 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1497 target_pid_to_str (ptid_of (thread
)),
1498 gdb_signal_to_string (signo
));
1500 return WSTOPSIG (status
);
1504 /* Detach from LWP. */
1507 linux_detach_one_lwp (struct lwp_info
*lwp
)
1509 struct thread_info
*thread
= get_lwp_thread (lwp
);
1513 /* If there is a pending SIGSTOP, get rid of it. */
1514 if (lwp
->stop_expected
)
1517 debug_printf ("Sending SIGCONT to %s\n",
1518 target_pid_to_str (ptid_of (thread
)));
1520 kill_lwp (lwpid_of (thread
), SIGCONT
);
1521 lwp
->stop_expected
= 0;
1524 /* Pass on any pending signal for this thread. */
1525 sig
= get_detach_signal (thread
);
1527 /* Preparing to resume may try to write registers, and fail if the
1528 lwp is zombie. If that happens, ignore the error. We'll handle
1529 it below, when detach fails with ESRCH. */
1532 /* Flush any pending changes to the process's registers. */
1533 regcache_invalidate_thread (thread
);
1535 /* Finally, let it resume. */
1536 if (the_low_target
.prepare_to_resume
!= NULL
)
1537 the_low_target
.prepare_to_resume (lwp
);
1539 CATCH (ex
, RETURN_MASK_ERROR
)
1541 if (!check_ptrace_stopped_lwp_gone (lwp
))
1542 throw_exception (ex
);
1546 lwpid
= lwpid_of (thread
);
1547 if (ptrace (PTRACE_DETACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0,
1548 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1550 int save_errno
= errno
;
1552 /* We know the thread exists, so ESRCH must mean the lwp is
1553 zombie. This can happen if one of the already-detached
1554 threads exits the whole thread group. In that case we're
1555 still attached, and must reap the lwp. */
1556 if (save_errno
== ESRCH
)
1560 ret
= my_waitpid (lwpid
, &status
, __WALL
);
1563 warning (_("Couldn't reap LWP %d while detaching: %s"),
1564 lwpid
, strerror (errno
));
1566 else if (!WIFEXITED (status
) && !WIFSIGNALED (status
))
1568 warning (_("Reaping LWP %d while detaching "
1569 "returned unexpected status 0x%x"),
1575 error (_("Can't detach %s: %s"),
1576 target_pid_to_str (ptid_of (thread
)),
1577 strerror (save_errno
));
1580 else if (debug_threads
)
1582 debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n",
1583 target_pid_to_str (ptid_of (thread
)),
1590 /* Callback for for_each_thread. Detaches from non-leader threads of a
1594 linux_detach_lwp_callback (thread_info
*thread
)
1596 /* We don't actually detach from the thread group leader just yet.
1597 If the thread group exits, we must reap the zombie clone lwps
1598 before we're able to reap the leader. */
1599 if (thread
->id
.pid () == thread
->id
.lwp ())
1602 lwp_info
*lwp
= get_thread_lwp (thread
);
1603 linux_detach_one_lwp (lwp
);
1607 linux_detach (int pid
)
1609 struct process_info
*process
;
1610 struct lwp_info
*main_lwp
;
1612 process
= find_process_pid (pid
);
1613 if (process
== NULL
)
1616 /* As there's a step over already in progress, let it finish first,
1617 otherwise nesting a stabilize_threads operation on top gets real
1619 complete_ongoing_step_over ();
1621 /* Stop all threads before detaching. First, ptrace requires that
1622 the thread is stopped to sucessfully detach. Second, thread_db
1623 may need to uninstall thread event breakpoints from memory, which
1624 only works with a stopped process anyway. */
1625 stop_all_lwps (0, NULL
);
1627 #ifdef USE_THREAD_DB
1628 thread_db_detach (process
);
1631 /* Stabilize threads (move out of jump pads). */
1632 stabilize_threads ();
1634 /* Detach from the clone lwps first. If the thread group exits just
1635 while we're detaching, we must reap the clone lwps before we're
1636 able to reap the leader. */
1637 for_each_thread (pid
, linux_detach_lwp_callback
);
1639 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1640 linux_detach_one_lwp (main_lwp
);
1642 the_target
->mourn (process
);
1644 /* Since we presently can only stop all lwps of all processes, we
1645 need to unstop lwps of other processes. */
1646 unstop_all_lwps (0, NULL
);
1650 /* Remove all LWPs that belong to process PROC from the lwp list. */
1653 linux_mourn (struct process_info
*process
)
1655 struct process_info_private
*priv
;
1657 #ifdef USE_THREAD_DB
1658 thread_db_mourn (process
);
1661 for_each_thread (process
->pid
, [] (thread_info
*thread
)
1663 delete_lwp (get_thread_lwp (thread
));
1666 /* Freeing all private data. */
1667 priv
= process
->priv
;
1668 if (the_low_target
.delete_process
!= NULL
)
1669 the_low_target
.delete_process (priv
->arch_private
);
1671 gdb_assert (priv
->arch_private
== NULL
);
1673 process
->priv
= NULL
;
1675 remove_process (process
);
1679 linux_join (int pid
)
1684 ret
= my_waitpid (pid
, &status
, 0);
1685 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1687 } while (ret
!= -1 || errno
!= ECHILD
);
1690 /* Return nonzero if the given thread is still alive. */
1692 linux_thread_alive (ptid_t ptid
)
1694 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1696 /* We assume we always know if a thread exits. If a whole process
1697 exited but we still haven't been able to report it to GDB, we'll
1698 hold on to the last lwp of the dead process. */
1700 return !lwp_is_marked_dead (lwp
);
1705 /* Return 1 if this lwp still has an interesting status pending. If
1706 not (e.g., it had stopped for a breakpoint that is gone), return
1710 thread_still_has_status_pending_p (struct thread_info
*thread
)
1712 struct lwp_info
*lp
= get_thread_lwp (thread
);
1714 if (!lp
->status_pending_p
)
1717 if (thread
->last_resume_kind
!= resume_stop
1718 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1719 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1721 struct thread_info
*saved_thread
;
1725 gdb_assert (lp
->last_status
!= 0);
1729 saved_thread
= current_thread
;
1730 current_thread
= thread
;
1732 if (pc
!= lp
->stop_pc
)
1735 debug_printf ("PC of %ld changed\n",
1740 #if !USE_SIGTRAP_SIGINFO
1741 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1742 && !(*the_low_target
.breakpoint_at
) (pc
))
1745 debug_printf ("previous SW breakpoint of %ld gone\n",
1749 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1750 && !hardware_breakpoint_inserted_here (pc
))
1753 debug_printf ("previous HW breakpoint of %ld gone\n",
1759 current_thread
= saved_thread
;
1764 debug_printf ("discarding pending breakpoint status\n");
1765 lp
->status_pending_p
= 0;
1773 /* Returns true if LWP is resumed from the client's perspective. */
1776 lwp_resumed (struct lwp_info
*lwp
)
1778 struct thread_info
*thread
= get_lwp_thread (lwp
);
1780 if (thread
->last_resume_kind
!= resume_stop
)
1783 /* Did gdb send us a `vCont;t', but we haven't reported the
1784 corresponding stop to gdb yet? If so, the thread is still
1785 resumed/running from gdb's perspective. */
1786 if (thread
->last_resume_kind
== resume_stop
1787 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1793 /* Return true if this lwp has an interesting status pending. */
1795 status_pending_p_callback (thread_info
*thread
, ptid_t ptid
)
1797 struct lwp_info
*lp
= get_thread_lwp (thread
);
1799 /* Check if we're only interested in events from a specific process
1800 or a specific LWP. */
1801 if (!thread
->id
.matches (ptid
))
1804 if (!lwp_resumed (lp
))
1807 if (lp
->status_pending_p
1808 && !thread_still_has_status_pending_p (thread
))
1810 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1814 return lp
->status_pending_p
;
1818 find_lwp_pid (ptid_t ptid
)
1820 thread_info
*thread
= find_thread ([&] (thread_info
*thread
)
1822 int lwp
= ptid
.lwp () != 0 ? ptid
.lwp () : ptid
.pid ();
1823 return thread
->id
.lwp () == lwp
;
1829 return get_thread_lwp (thread
);
1832 /* Return the number of known LWPs in the tgid given by PID. */
1839 for_each_thread (pid
, [&] (thread_info
*thread
)
1847 /* See nat/linux-nat.h. */
1850 iterate_over_lwps (ptid_t filter
,
1851 iterate_over_lwps_ftype callback
,
1854 thread_info
*thread
= find_thread (filter
, [&] (thread_info
*thread
)
1856 lwp_info
*lwp
= get_thread_lwp (thread
);
1858 return callback (lwp
, data
);
1864 return get_thread_lwp (thread
);
1867 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1868 their exits until all other threads in the group have exited. */
1871 check_zombie_leaders (void)
1873 for_each_process ([] (process_info
*proc
) {
1874 pid_t leader_pid
= pid_of (proc
);
1875 struct lwp_info
*leader_lp
;
1877 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1880 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1881 "num_lwps=%d, zombie=%d\n",
1882 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1883 linux_proc_pid_is_zombie (leader_pid
));
1885 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1886 /* Check if there are other threads in the group, as we may
1887 have raced with the inferior simply exiting. */
1888 && !last_thread_of_process_p (leader_pid
)
1889 && linux_proc_pid_is_zombie (leader_pid
))
1891 /* A leader zombie can mean one of two things:
1893 - It exited, and there's an exit status pending
1894 available, or only the leader exited (not the whole
1895 program). In the latter case, we can't waitpid the
1896 leader's exit status until all other threads are gone.
1898 - There are 3 or more threads in the group, and a thread
1899 other than the leader exec'd. On an exec, the Linux
1900 kernel destroys all other threads (except the execing
1901 one) in the thread group, and resets the execing thread's
1902 tid to the tgid. No exit notification is sent for the
1903 execing thread -- from the ptracer's perspective, it
1904 appears as though the execing thread just vanishes.
1905 Until we reap all other threads except the leader and the
1906 execing thread, the leader will be zombie, and the
1907 execing thread will be in `D (disc sleep)'. As soon as
1908 all other threads are reaped, the execing thread changes
1909 it's tid to the tgid, and the previous (zombie) leader
1910 vanishes, giving place to the "new" leader. We could try
1911 distinguishing the exit and exec cases, by waiting once
1912 more, and seeing if something comes out, but it doesn't
1913 sound useful. The previous leader _does_ go away, and
1914 we'll re-add the new one once we see the exec event
1915 (which is just the same as what would happen if the
1916 previous leader did exit voluntarily before some other
1920 debug_printf ("CZL: Thread group leader %d zombie "
1921 "(it exited, or another thread execd).\n",
1924 delete_lwp (leader_lp
);
1929 /* Callback for `find_thread'. Returns the first LWP that is not
1933 not_stopped_callback (thread_info
*thread
, ptid_t filter
)
1935 if (!thread
->id
.matches (filter
))
1938 lwp_info
*lwp
= get_thread_lwp (thread
);
1940 return !lwp
->stopped
;
1943 /* Increment LWP's suspend count. */
1946 lwp_suspended_inc (struct lwp_info
*lwp
)
1950 if (debug_threads
&& lwp
->suspended
> 4)
1952 struct thread_info
*thread
= get_lwp_thread (lwp
);
1954 debug_printf ("LWP %ld has a suspiciously high suspend count,"
1955 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
1959 /* Decrement LWP's suspend count. */
1962 lwp_suspended_decr (struct lwp_info
*lwp
)
1966 if (lwp
->suspended
< 0)
1968 struct thread_info
*thread
= get_lwp_thread (lwp
);
1970 internal_error (__FILE__
, __LINE__
,
1971 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
1976 /* This function should only be called if the LWP got a SIGTRAP.
1978 Handle any tracepoint steps or hits. Return true if a tracepoint
1979 event was handled, 0 otherwise. */
1982 handle_tracepoints (struct lwp_info
*lwp
)
1984 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1985 int tpoint_related_event
= 0;
1987 gdb_assert (lwp
->suspended
== 0);
1989 /* If this tracepoint hit causes a tracing stop, we'll immediately
1990 uninsert tracepoints. To do this, we temporarily pause all
1991 threads, unpatch away, and then unpause threads. We need to make
1992 sure the unpausing doesn't resume LWP too. */
1993 lwp_suspended_inc (lwp
);
1995 /* And we need to be sure that any all-threads-stopping doesn't try
1996 to move threads out of the jump pads, as it could deadlock the
1997 inferior (LWP could be in the jump pad, maybe even holding the
2000 /* Do any necessary step collect actions. */
2001 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2003 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2005 /* See if we just hit a tracepoint and do its main collect
2007 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2009 lwp_suspended_decr (lwp
);
2011 gdb_assert (lwp
->suspended
== 0);
2012 gdb_assert (!stabilizing_threads
2013 || (lwp
->collecting_fast_tracepoint
2014 != fast_tpoint_collect_result::not_collecting
));
2016 if (tpoint_related_event
)
2019 debug_printf ("got a tracepoint event\n");
2026 /* Convenience wrapper. Returns information about LWP's fast tracepoint
2027 collection status. */
2029 static fast_tpoint_collect_result
2030 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2031 struct fast_tpoint_collect_status
*status
)
2033 CORE_ADDR thread_area
;
2034 struct thread_info
*thread
= get_lwp_thread (lwp
);
2036 if (the_low_target
.get_thread_area
== NULL
)
2037 return fast_tpoint_collect_result::not_collecting
;
2039 /* Get the thread area address. This is used to recognize which
2040 thread is which when tracing with the in-process agent library.
2041 We don't read anything from the address, and treat it as opaque;
2042 it's the address itself that we assume is unique per-thread. */
2043 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2044 return fast_tpoint_collect_result::not_collecting
;
2046 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2049 /* The reason we resume in the caller, is because we want to be able
2050 to pass lwp->status_pending as WSTAT, and we need to clear
2051 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2052 refuses to resume. */
2055 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2057 struct thread_info
*saved_thread
;
2059 saved_thread
= current_thread
;
2060 current_thread
= get_lwp_thread (lwp
);
2063 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2064 && supports_fast_tracepoints ()
2065 && agent_loaded_p ())
2067 struct fast_tpoint_collect_status status
;
2070 debug_printf ("Checking whether LWP %ld needs to move out of the "
2072 lwpid_of (current_thread
));
2074 fast_tpoint_collect_result r
2075 = linux_fast_tracepoint_collecting (lwp
, &status
);
2078 || (WSTOPSIG (*wstat
) != SIGILL
2079 && WSTOPSIG (*wstat
) != SIGFPE
2080 && WSTOPSIG (*wstat
) != SIGSEGV
2081 && WSTOPSIG (*wstat
) != SIGBUS
))
2083 lwp
->collecting_fast_tracepoint
= r
;
2085 if (r
!= fast_tpoint_collect_result::not_collecting
)
2087 if (r
== fast_tpoint_collect_result::before_insn
2088 && lwp
->exit_jump_pad_bkpt
== NULL
)
2090 /* Haven't executed the original instruction yet.
2091 Set breakpoint there, and wait till it's hit,
2092 then single-step until exiting the jump pad. */
2093 lwp
->exit_jump_pad_bkpt
2094 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2098 debug_printf ("Checking whether LWP %ld needs to move out of "
2099 "the jump pad...it does\n",
2100 lwpid_of (current_thread
));
2101 current_thread
= saved_thread
;
2108 /* If we get a synchronous signal while collecting, *and*
2109 while executing the (relocated) original instruction,
2110 reset the PC to point at the tpoint address, before
2111 reporting to GDB. Otherwise, it's an IPA lib bug: just
2112 report the signal to GDB, and pray for the best. */
2114 lwp
->collecting_fast_tracepoint
2115 = fast_tpoint_collect_result::not_collecting
;
2117 if (r
!= fast_tpoint_collect_result::not_collecting
2118 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2119 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2122 struct regcache
*regcache
;
2124 /* The si_addr on a few signals references the address
2125 of the faulting instruction. Adjust that as
2127 if ((WSTOPSIG (*wstat
) == SIGILL
2128 || WSTOPSIG (*wstat
) == SIGFPE
2129 || WSTOPSIG (*wstat
) == SIGBUS
2130 || WSTOPSIG (*wstat
) == SIGSEGV
)
2131 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2132 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2133 /* Final check just to make sure we don't clobber
2134 the siginfo of non-kernel-sent signals. */
2135 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2137 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2138 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2139 (PTRACE_TYPE_ARG3
) 0, &info
);
2142 regcache
= get_thread_regcache (current_thread
, 1);
2143 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2144 lwp
->stop_pc
= status
.tpoint_addr
;
2146 /* Cancel any fast tracepoint lock this thread was
2148 force_unlock_trace_buffer ();
2151 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2154 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2155 "stopping all threads momentarily.\n");
2157 stop_all_lwps (1, lwp
);
2159 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2160 lwp
->exit_jump_pad_bkpt
= NULL
;
2162 unstop_all_lwps (1, lwp
);
2164 gdb_assert (lwp
->suspended
>= 0);
2170 debug_printf ("Checking whether LWP %ld needs to move out of the "
2172 lwpid_of (current_thread
));
2174 current_thread
= saved_thread
;
2178 /* Enqueue one signal in the "signals to report later when out of the
2182 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2184 struct pending_signals
*p_sig
;
2185 struct thread_info
*thread
= get_lwp_thread (lwp
);
2188 debug_printf ("Deferring signal %d for LWP %ld.\n",
2189 WSTOPSIG (*wstat
), lwpid_of (thread
));
2193 struct pending_signals
*sig
;
2195 for (sig
= lwp
->pending_signals_to_report
;
2198 debug_printf (" Already queued %d\n",
2201 debug_printf (" (no more currently queued signals)\n");
2204 /* Don't enqueue non-RT signals if they are already in the deferred
2205 queue. (SIGSTOP being the easiest signal to see ending up here
2207 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2209 struct pending_signals
*sig
;
2211 for (sig
= lwp
->pending_signals_to_report
;
2215 if (sig
->signal
== WSTOPSIG (*wstat
))
2218 debug_printf ("Not requeuing already queued non-RT signal %d"
2227 p_sig
= XCNEW (struct pending_signals
);
2228 p_sig
->prev
= lwp
->pending_signals_to_report
;
2229 p_sig
->signal
= WSTOPSIG (*wstat
);
2231 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2234 lwp
->pending_signals_to_report
= p_sig
;
2237 /* Dequeue one signal from the "signals to report later when out of
2238 the jump pad" list. */
2241 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2243 struct thread_info
*thread
= get_lwp_thread (lwp
);
2245 if (lwp
->pending_signals_to_report
!= NULL
)
2247 struct pending_signals
**p_sig
;
2249 p_sig
= &lwp
->pending_signals_to_report
;
2250 while ((*p_sig
)->prev
!= NULL
)
2251 p_sig
= &(*p_sig
)->prev
;
2253 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2254 if ((*p_sig
)->info
.si_signo
!= 0)
2255 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2261 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2262 WSTOPSIG (*wstat
), lwpid_of (thread
));
2266 struct pending_signals
*sig
;
2268 for (sig
= lwp
->pending_signals_to_report
;
2271 debug_printf (" Still queued %d\n",
2274 debug_printf (" (no more queued signals)\n");
2283 /* Fetch the possibly triggered data watchpoint info and store it in
2286 On some archs, like x86, that use debug registers to set
2287 watchpoints, it's possible that the way to know which watched
2288 address trapped, is to check the register that is used to select
2289 which address to watch. Problem is, between setting the watchpoint
2290 and reading back which data address trapped, the user may change
2291 the set of watchpoints, and, as a consequence, GDB changes the
2292 debug registers in the inferior. To avoid reading back a stale
2293 stopped-data-address when that happens, we cache in LP the fact
2294 that a watchpoint trapped, and the corresponding data address, as
2295 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2296 registers meanwhile, we have the cached data we can rely on. */
2299 check_stopped_by_watchpoint (struct lwp_info
*child
)
2301 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2303 struct thread_info
*saved_thread
;
2305 saved_thread
= current_thread
;
2306 current_thread
= get_lwp_thread (child
);
2308 if (the_low_target
.stopped_by_watchpoint ())
2310 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2312 if (the_low_target
.stopped_data_address
!= NULL
)
2313 child
->stopped_data_address
2314 = the_low_target
.stopped_data_address ();
2316 child
->stopped_data_address
= 0;
2319 current_thread
= saved_thread
;
2322 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2325 /* Return the ptrace options that we want to try to enable. */
2328 linux_low_ptrace_options (int attached
)
2333 options
|= PTRACE_O_EXITKILL
;
2335 if (report_fork_events
)
2336 options
|= PTRACE_O_TRACEFORK
;
2338 if (report_vfork_events
)
2339 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2341 if (report_exec_events
)
2342 options
|= PTRACE_O_TRACEEXEC
;
2344 options
|= PTRACE_O_TRACESYSGOOD
;
2349 /* Do low-level handling of the event, and check if we should go on
2350 and pass it to caller code. Return the affected lwp if we are, or
2353 static struct lwp_info
*
2354 linux_low_filter_event (int lwpid
, int wstat
)
2356 struct lwp_info
*child
;
2357 struct thread_info
*thread
;
2358 int have_stop_pc
= 0;
2360 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2362 /* Check for stop events reported by a process we didn't already
2363 know about - anything not already in our LWP list.
2365 If we're expecting to receive stopped processes after
2366 fork, vfork, and clone events, then we'll just add the
2367 new one to our list and go back to waiting for the event
2368 to be reported - the stopped process might be returned
2369 from waitpid before or after the event is.
2371 But note the case of a non-leader thread exec'ing after the
2372 leader having exited, and gone from our lists (because
2373 check_zombie_leaders deleted it). The non-leader thread
2374 changes its tid to the tgid. */
2376 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2377 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2381 /* A multi-thread exec after we had seen the leader exiting. */
2384 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2385 "after exec.\n", lwpid
);
2388 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2389 child
= add_lwp (child_ptid
);
2391 current_thread
= child
->thread
;
2394 /* If we didn't find a process, one of two things presumably happened:
2395 - A process we started and then detached from has exited. Ignore it.
2396 - A process we are controlling has forked and the new child's stop
2397 was reported to us by the kernel. Save its PID. */
2398 if (child
== NULL
&& WIFSTOPPED (wstat
))
2400 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2403 else if (child
== NULL
)
2406 thread
= get_lwp_thread (child
);
2410 child
->last_status
= wstat
;
2412 /* Check if the thread has exited. */
2413 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2416 debug_printf ("LLFE: %d exited.\n", lwpid
);
2418 if (finish_step_over (child
))
2420 /* Unsuspend all other LWPs, and set them back running again. */
2421 unsuspend_all_lwps (child
);
2424 /* If there is at least one more LWP, then the exit signal was
2425 not the end of the debugged application and should be
2426 ignored, unless GDB wants to hear about thread exits. */
2427 if (report_thread_events
2428 || last_thread_of_process_p (pid_of (thread
)))
2430 /* Since events are serialized to GDB core, and we can't
2431 report this one right now. Leave the status pending for
2432 the next time we're able to report it. */
2433 mark_lwp_dead (child
, wstat
);
2443 gdb_assert (WIFSTOPPED (wstat
));
2445 if (WIFSTOPPED (wstat
))
2447 struct process_info
*proc
;
2449 /* Architecture-specific setup after inferior is running. */
2450 proc
= find_process_pid (pid_of (thread
));
2451 if (proc
->tdesc
== NULL
)
2455 /* This needs to happen after we have attached to the
2456 inferior and it is stopped for the first time, but
2457 before we access any inferior registers. */
2458 linux_arch_setup_thread (thread
);
2462 /* The process is started, but GDBserver will do
2463 architecture-specific setup after the program stops at
2464 the first instruction. */
2465 child
->status_pending_p
= 1;
2466 child
->status_pending
= wstat
;
2472 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2474 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2475 int options
= linux_low_ptrace_options (proc
->attached
);
2477 linux_enable_event_reporting (lwpid
, options
);
2478 child
->must_set_ptrace_flags
= 0;
2481 /* Always update syscall_state, even if it will be filtered later. */
2482 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2484 child
->syscall_state
2485 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2486 ? TARGET_WAITKIND_SYSCALL_RETURN
2487 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2491 /* Almost all other ptrace-stops are known to be outside of system
2492 calls, with further exceptions in handle_extended_wait. */
2493 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2496 /* Be careful to not overwrite stop_pc until save_stop_reason is
2498 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2499 && linux_is_extended_waitstatus (wstat
))
2501 child
->stop_pc
= get_pc (child
);
2502 if (handle_extended_wait (&child
, wstat
))
2504 /* The event has been handled, so just return without
2510 if (linux_wstatus_maybe_breakpoint (wstat
))
2512 if (save_stop_reason (child
))
2517 child
->stop_pc
= get_pc (child
);
2519 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2520 && child
->stop_expected
)
2523 debug_printf ("Expected stop.\n");
2524 child
->stop_expected
= 0;
2526 if (thread
->last_resume_kind
== resume_stop
)
2528 /* We want to report the stop to the core. Treat the
2529 SIGSTOP as a normal event. */
2531 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2532 target_pid_to_str (ptid_of (thread
)));
2534 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2536 /* Stopping threads. We don't want this SIGSTOP to end up
2539 debug_printf ("LLW: SIGSTOP caught for %s "
2540 "while stopping threads.\n",
2541 target_pid_to_str (ptid_of (thread
)));
2546 /* This is a delayed SIGSTOP. Filter out the event. */
2548 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2549 child
->stepping
? "step" : "continue",
2550 target_pid_to_str (ptid_of (thread
)));
2552 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2557 child
->status_pending_p
= 1;
2558 child
->status_pending
= wstat
;
2562 /* Return true if THREAD is doing hardware single step. */
2565 maybe_hw_step (struct thread_info
*thread
)
2567 if (can_hardware_single_step ())
2571 /* GDBserver must insert single-step breakpoint for software
2573 gdb_assert (has_single_step_breakpoints (thread
));
2578 /* Resume LWPs that are currently stopped without any pending status
2579 to report, but are resumed from the core's perspective. */
2582 resume_stopped_resumed_lwps (thread_info
*thread
)
2584 struct lwp_info
*lp
= get_thread_lwp (thread
);
2588 && !lp
->status_pending_p
2589 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2593 if (thread
->last_resume_kind
== resume_step
)
2594 step
= maybe_hw_step (thread
);
2597 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2598 target_pid_to_str (ptid_of (thread
)),
2599 paddress (lp
->stop_pc
),
2602 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2606 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2607 match FILTER_PTID (leaving others pending). The PTIDs can be:
2608 minus_one_ptid, to specify any child; a pid PTID, specifying all
2609 lwps of a thread group; or a PTID representing a single lwp. Store
2610 the stop status through the status pointer WSTAT. OPTIONS is
2611 passed to the waitpid call. Return 0 if no event was found and
2612 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2613 was found. Return the PID of the stopped child otherwise. */
2616 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2617 int *wstatp
, int options
)
2619 struct thread_info
*event_thread
;
2620 struct lwp_info
*event_child
, *requested_child
;
2621 sigset_t block_mask
, prev_mask
;
2624 /* N.B. event_thread points to the thread_info struct that contains
2625 event_child. Keep them in sync. */
2626 event_thread
= NULL
;
2628 requested_child
= NULL
;
2630 /* Check for a lwp with a pending status. */
2632 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2634 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2636 return status_pending_p_callback (thread
, filter_ptid
);
2639 if (event_thread
!= NULL
)
2640 event_child
= get_thread_lwp (event_thread
);
2641 if (debug_threads
&& event_thread
)
2642 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2644 else if (!ptid_equal (filter_ptid
, null_ptid
))
2646 requested_child
= find_lwp_pid (filter_ptid
);
2648 if (stopping_threads
== NOT_STOPPING_THREADS
2649 && requested_child
->status_pending_p
2650 && (requested_child
->collecting_fast_tracepoint
2651 != fast_tpoint_collect_result::not_collecting
))
2653 enqueue_one_deferred_signal (requested_child
,
2654 &requested_child
->status_pending
);
2655 requested_child
->status_pending_p
= 0;
2656 requested_child
->status_pending
= 0;
2657 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2660 if (requested_child
->suspended
2661 && requested_child
->status_pending_p
)
2663 internal_error (__FILE__
, __LINE__
,
2664 "requesting an event out of a"
2665 " suspended child?");
2668 if (requested_child
->status_pending_p
)
2670 event_child
= requested_child
;
2671 event_thread
= get_lwp_thread (event_child
);
2675 if (event_child
!= NULL
)
2678 debug_printf ("Got an event from pending child %ld (%04x)\n",
2679 lwpid_of (event_thread
), event_child
->status_pending
);
2680 *wstatp
= event_child
->status_pending
;
2681 event_child
->status_pending_p
= 0;
2682 event_child
->status_pending
= 0;
2683 current_thread
= event_thread
;
2684 return lwpid_of (event_thread
);
2687 /* But if we don't find a pending event, we'll have to wait.
2689 We only enter this loop if no process has a pending wait status.
2690 Thus any action taken in response to a wait status inside this
2691 loop is responding as soon as we detect the status, not after any
2694 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2695 all signals while here. */
2696 sigfillset (&block_mask
);
2697 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2699 /* Always pull all events out of the kernel. We'll randomly select
2700 an event LWP out of all that have events, to prevent
2702 while (event_child
== NULL
)
2706 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2709 - If the thread group leader exits while other threads in the
2710 thread group still exist, waitpid(TGID, ...) hangs. That
2711 waitpid won't return an exit status until the other threads
2712 in the group are reaped.
2714 - When a non-leader thread execs, that thread just vanishes
2715 without reporting an exit (so we'd hang if we waited for it
2716 explicitly in that case). The exec event is reported to
2719 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2722 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2723 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2729 debug_printf ("LLW: waitpid %ld received %s\n",
2730 (long) ret
, status_to_str (*wstatp
));
2733 /* Filter all events. IOW, leave all events pending. We'll
2734 randomly select an event LWP out of all that have events
2736 linux_low_filter_event (ret
, *wstatp
);
2737 /* Retry until nothing comes out of waitpid. A single
2738 SIGCHLD can indicate more than one child stopped. */
2742 /* Now that we've pulled all events out of the kernel, resume
2743 LWPs that don't have an interesting event to report. */
2744 if (stopping_threads
== NOT_STOPPING_THREADS
)
2745 for_each_thread (resume_stopped_resumed_lwps
);
2747 /* ... and find an LWP with a status to report to the core, if
2749 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2751 return status_pending_p_callback (thread
, filter_ptid
);
2754 if (event_thread
!= NULL
)
2756 event_child
= get_thread_lwp (event_thread
);
2757 *wstatp
= event_child
->status_pending
;
2758 event_child
->status_pending_p
= 0;
2759 event_child
->status_pending
= 0;
2763 /* Check for zombie thread group leaders. Those can't be reaped
2764 until all other threads in the thread group are. */
2765 check_zombie_leaders ();
2767 auto not_stopped
= [&] (thread_info
*thread
)
2769 return not_stopped_callback (thread
, wait_ptid
);
2772 /* If there are no resumed children left in the set of LWPs we
2773 want to wait for, bail. We can't just block in
2774 waitpid/sigsuspend, because lwps might have been left stopped
2775 in trace-stop state, and we'd be stuck forever waiting for
2776 their status to change (which would only happen if we resumed
2777 them). Even if WNOHANG is set, this return code is preferred
2778 over 0 (below), as it is more detailed. */
2779 if (find_thread (not_stopped
) == NULL
)
2782 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2783 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2787 /* No interesting event to report to the caller. */
2788 if ((options
& WNOHANG
))
2791 debug_printf ("WNOHANG set, no event found\n");
2793 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2797 /* Block until we get an event reported with SIGCHLD. */
2799 debug_printf ("sigsuspend'ing\n");
2801 sigsuspend (&prev_mask
);
2802 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2806 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2808 current_thread
= event_thread
;
2810 return lwpid_of (event_thread
);
2813 /* Wait for an event from child(ren) PTID. PTIDs can be:
2814 minus_one_ptid, to specify any child; a pid PTID, specifying all
2815 lwps of a thread group; or a PTID representing a single lwp. Store
2816 the stop status through the status pointer WSTAT. OPTIONS is
2817 passed to the waitpid call. Return 0 if no event was found and
2818 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2819 was found. Return the PID of the stopped child otherwise. */
2822 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2824 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2827 /* Select one LWP out of those that have events pending. */
2830 select_event_lwp (struct lwp_info
**orig_lp
)
2832 int random_selector
;
2833 struct thread_info
*event_thread
= NULL
;
2835 /* In all-stop, give preference to the LWP that is being
2836 single-stepped. There will be at most one, and it's the LWP that
2837 the core is most interested in. If we didn't do this, then we'd
2838 have to handle pending step SIGTRAPs somehow in case the core
2839 later continues the previously-stepped thread, otherwise we'd
2840 report the pending SIGTRAP, and the core, not having stepped the
2841 thread, wouldn't understand what the trap was for, and therefore
2842 would report it to the user as a random signal. */
2845 event_thread
= find_thread ([] (thread_info
*thread
)
2847 lwp_info
*lp
= get_thread_lwp (thread
);
2849 return (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2850 && thread
->last_resume_kind
== resume_step
2851 && lp
->status_pending_p
);
2854 if (event_thread
!= NULL
)
2857 debug_printf ("SEL: Select single-step %s\n",
2858 target_pid_to_str (ptid_of (event_thread
)));
2861 if (event_thread
== NULL
)
2863 /* No single-stepping LWP. Select one at random, out of those
2864 which have had events. */
2866 /* First see how many events we have. */
2868 for_each_thread ([&] (thread_info
*thread
)
2870 lwp_info
*lp
= get_thread_lwp (thread
);
2872 /* Count only resumed LWPs that have an event pending. */
2873 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2874 && lp
->status_pending_p
)
2877 gdb_assert (num_events
> 0);
2879 /* Now randomly pick a LWP out of those that have had
2881 random_selector
= (int)
2882 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2884 if (debug_threads
&& num_events
> 1)
2885 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2886 num_events
, random_selector
);
2888 event_thread
= find_thread ([&] (thread_info
*thread
)
2890 lwp_info
*lp
= get_thread_lwp (thread
);
2892 /* Select only resumed LWPs that have an event pending. */
2893 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2894 && lp
->status_pending_p
)
2895 if (random_selector
-- == 0)
2902 if (event_thread
!= NULL
)
2904 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2906 /* Switch the event LWP. */
2907 *orig_lp
= event_lp
;
2911 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2915 unsuspend_all_lwps (struct lwp_info
*except
)
2917 for_each_thread ([&] (thread_info
*thread
)
2919 lwp_info
*lwp
= get_thread_lwp (thread
);
2922 lwp_suspended_decr (lwp
);
2926 static void move_out_of_jump_pad_callback (thread_info
*thread
);
2927 static bool stuck_in_jump_pad_callback (thread_info
*thread
);
2928 static bool lwp_running (thread_info
*thread
);
2929 static ptid_t
linux_wait_1 (ptid_t ptid
,
2930 struct target_waitstatus
*ourstatus
,
2931 int target_options
);
2933 /* Stabilize threads (move out of jump pads).
2935 If a thread is midway collecting a fast tracepoint, we need to
2936 finish the collection and move it out of the jump pad before
2937 reporting the signal.
2939 This avoids recursion while collecting (when a signal arrives
2940 midway, and the signal handler itself collects), which would trash
2941 the trace buffer. In case the user set a breakpoint in a signal
2942 handler, this avoids the backtrace showing the jump pad, etc..
2943 Most importantly, there are certain things we can't do safely if
2944 threads are stopped in a jump pad (or in its callee's). For
2947 - starting a new trace run. A thread still collecting the
2948 previous run, could trash the trace buffer when resumed. The trace
2949 buffer control structures would have been reset but the thread had
2950 no way to tell. The thread could even midway memcpy'ing to the
2951 buffer, which would mean that when resumed, it would clobber the
2952 trace buffer that had been set for a new run.
2954 - we can't rewrite/reuse the jump pads for new tracepoints
2955 safely. Say you do tstart while a thread is stopped midway while
2956 collecting. When the thread is later resumed, it finishes the
2957 collection, and returns to the jump pad, to execute the original
2958 instruction that was under the tracepoint jump at the time the
2959 older run had been started. If the jump pad had been rewritten
2960 since for something else in the new run, the thread would now
2961 execute the wrong / random instructions. */
2964 linux_stabilize_threads (void)
2966 thread_info
*thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
2968 if (thread_stuck
!= NULL
)
2971 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2972 lwpid_of (thread_stuck
));
2976 thread_info
*saved_thread
= current_thread
;
2978 stabilizing_threads
= 1;
2981 for_each_thread (move_out_of_jump_pad_callback
);
2983 /* Loop until all are stopped out of the jump pads. */
2984 while (find_thread (lwp_running
) != NULL
)
2986 struct target_waitstatus ourstatus
;
2987 struct lwp_info
*lwp
;
2990 /* Note that we go through the full wait even loop. While
2991 moving threads out of jump pad, we need to be able to step
2992 over internal breakpoints and such. */
2993 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2995 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2997 lwp
= get_thread_lwp (current_thread
);
3000 lwp_suspended_inc (lwp
);
3002 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3003 || current_thread
->last_resume_kind
== resume_stop
)
3005 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3006 enqueue_one_deferred_signal (lwp
, &wstat
);
3011 unsuspend_all_lwps (NULL
);
3013 stabilizing_threads
= 0;
3015 current_thread
= saved_thread
;
3019 thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
3021 if (thread_stuck
!= NULL
)
3022 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3023 lwpid_of (thread_stuck
));
3027 /* Convenience function that is called when the kernel reports an
3028 event that is not passed out to GDB. */
3031 ignore_event (struct target_waitstatus
*ourstatus
)
3033 /* If we got an event, there may still be others, as a single
3034 SIGCHLD can indicate more than one child stopped. This forces
3035 another target_wait call. */
3038 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3042 /* Convenience function that is called when the kernel reports an exit
3043 event. This decides whether to report the event to GDB as a
3044 process exit event, a thread exit event, or to suppress the
3048 filter_exit_event (struct lwp_info
*event_child
,
3049 struct target_waitstatus
*ourstatus
)
3051 struct thread_info
*thread
= get_lwp_thread (event_child
);
3052 ptid_t ptid
= ptid_of (thread
);
3054 if (!last_thread_of_process_p (pid_of (thread
)))
3056 if (report_thread_events
)
3057 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3059 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3061 delete_lwp (event_child
);
3066 /* Returns 1 if GDB is interested in any event_child syscalls. */
3069 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3071 struct thread_info
*thread
= get_lwp_thread (event_child
);
3072 struct process_info
*proc
= get_thread_process (thread
);
3074 return !proc
->syscalls_to_catch
.empty ();
3077 /* Returns 1 if GDB is interested in the event_child syscall.
3078 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3081 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3084 struct thread_info
*thread
= get_lwp_thread (event_child
);
3085 struct process_info
*proc
= get_thread_process (thread
);
3087 if (proc
->syscalls_to_catch
.empty ())
3090 if (proc
->syscalls_to_catch
[0] == ANY_SYSCALL
)
3093 get_syscall_trapinfo (event_child
, &sysno
);
3095 for (int iter
: proc
->syscalls_to_catch
)
3102 /* Wait for process, returns status. */
3105 linux_wait_1 (ptid_t ptid
,
3106 struct target_waitstatus
*ourstatus
, int target_options
)
3109 struct lwp_info
*event_child
;
3112 int step_over_finished
;
3113 int bp_explains_trap
;
3114 int maybe_internal_trap
;
3123 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3126 /* Translate generic target options into linux options. */
3128 if (target_options
& TARGET_WNOHANG
)
3131 bp_explains_trap
= 0;
3134 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3136 auto status_pending_p_any
= [&] (thread_info
*thread
)
3138 return status_pending_p_callback (thread
, minus_one_ptid
);
3141 auto not_stopped
= [&] (thread_info
*thread
)
3143 return not_stopped_callback (thread
, minus_one_ptid
);
3146 /* Find a resumed LWP, if any. */
3147 if (find_thread (status_pending_p_any
) != NULL
)
3149 else if (find_thread (not_stopped
) != NULL
)
3154 if (ptid_equal (step_over_bkpt
, null_ptid
))
3155 pid
= linux_wait_for_event (ptid
, &w
, options
);
3159 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3160 target_pid_to_str (step_over_bkpt
));
3161 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3164 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3166 gdb_assert (target_options
& TARGET_WNOHANG
);
3170 debug_printf ("linux_wait_1 ret = null_ptid, "
3171 "TARGET_WAITKIND_IGNORE\n");
3175 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3182 debug_printf ("linux_wait_1 ret = null_ptid, "
3183 "TARGET_WAITKIND_NO_RESUMED\n");
3187 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3191 event_child
= get_thread_lwp (current_thread
);
3193 /* linux_wait_for_event only returns an exit status for the last
3194 child of a process. Report it. */
3195 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3199 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3200 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3204 debug_printf ("linux_wait_1 ret = %s, exited with "
3206 target_pid_to_str (ptid_of (current_thread
)),
3213 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3214 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3218 debug_printf ("linux_wait_1 ret = %s, terminated with "
3220 target_pid_to_str (ptid_of (current_thread
)),
3226 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3227 return filter_exit_event (event_child
, ourstatus
);
3229 return ptid_of (current_thread
);
3232 /* If step-over executes a breakpoint instruction, in the case of a
3233 hardware single step it means a gdb/gdbserver breakpoint had been
3234 planted on top of a permanent breakpoint, in the case of a software
3235 single step it may just mean that gdbserver hit the reinsert breakpoint.
3236 The PC has been adjusted by save_stop_reason to point at
3237 the breakpoint address.
3238 So in the case of the hardware single step advance the PC manually
3239 past the breakpoint and in the case of software single step advance only
3240 if it's not the single_step_breakpoint we are hitting.
3241 This avoids that a program would keep trapping a permanent breakpoint
3243 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3244 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3245 && (event_child
->stepping
3246 || !single_step_breakpoint_inserted_here (event_child
->stop_pc
)))
3248 int increment_pc
= 0;
3249 int breakpoint_kind
= 0;
3250 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3253 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3254 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3258 debug_printf ("step-over for %s executed software breakpoint\n",
3259 target_pid_to_str (ptid_of (current_thread
)));
3262 if (increment_pc
!= 0)
3264 struct regcache
*regcache
3265 = get_thread_regcache (current_thread
, 1);
3267 event_child
->stop_pc
+= increment_pc
;
3268 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3270 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3271 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3275 /* If this event was not handled before, and is not a SIGTRAP, we
3276 report it. SIGILL and SIGSEGV are also treated as traps in case
3277 a breakpoint is inserted at the current PC. If this target does
3278 not support internal breakpoints at all, we also report the
3279 SIGTRAP without further processing; it's of no concern to us. */
3281 = (supports_breakpoints ()
3282 && (WSTOPSIG (w
) == SIGTRAP
3283 || ((WSTOPSIG (w
) == SIGILL
3284 || WSTOPSIG (w
) == SIGSEGV
)
3285 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3287 if (maybe_internal_trap
)
3289 /* Handle anything that requires bookkeeping before deciding to
3290 report the event or continue waiting. */
3292 /* First check if we can explain the SIGTRAP with an internal
3293 breakpoint, or if we should possibly report the event to GDB.
3294 Do this before anything that may remove or insert a
3296 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3298 /* We have a SIGTRAP, possibly a step-over dance has just
3299 finished. If so, tweak the state machine accordingly,
3300 reinsert breakpoints and delete any single-step
3302 step_over_finished
= finish_step_over (event_child
);
3304 /* Now invoke the callbacks of any internal breakpoints there. */
3305 check_breakpoints (event_child
->stop_pc
);
3307 /* Handle tracepoint data collecting. This may overflow the
3308 trace buffer, and cause a tracing stop, removing
3310 trace_event
= handle_tracepoints (event_child
);
3312 if (bp_explains_trap
)
3315 debug_printf ("Hit a gdbserver breakpoint.\n");
3320 /* We have some other signal, possibly a step-over dance was in
3321 progress, and it should be cancelled too. */
3322 step_over_finished
= finish_step_over (event_child
);
3325 /* We have all the data we need. Either report the event to GDB, or
3326 resume threads and keep waiting for more. */
3328 /* If we're collecting a fast tracepoint, finish the collection and
3329 move out of the jump pad before delivering a signal. See
3330 linux_stabilize_threads. */
3333 && WSTOPSIG (w
) != SIGTRAP
3334 && supports_fast_tracepoints ()
3335 && agent_loaded_p ())
3338 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3339 "to defer or adjust it.\n",
3340 WSTOPSIG (w
), lwpid_of (current_thread
));
3342 /* Allow debugging the jump pad itself. */
3343 if (current_thread
->last_resume_kind
!= resume_step
3344 && maybe_move_out_of_jump_pad (event_child
, &w
))
3346 enqueue_one_deferred_signal (event_child
, &w
);
3349 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3350 WSTOPSIG (w
), lwpid_of (current_thread
));
3352 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3356 return ignore_event (ourstatus
);
3360 if (event_child
->collecting_fast_tracepoint
3361 != fast_tpoint_collect_result::not_collecting
)
3364 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3365 "Check if we're already there.\n",
3366 lwpid_of (current_thread
),
3367 (int) event_child
->collecting_fast_tracepoint
);
3371 event_child
->collecting_fast_tracepoint
3372 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3374 if (event_child
->collecting_fast_tracepoint
3375 != fast_tpoint_collect_result::before_insn
)
3377 /* No longer need this breakpoint. */
3378 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3381 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3382 "stopping all threads momentarily.\n");
3384 /* Other running threads could hit this breakpoint.
3385 We don't handle moribund locations like GDB does,
3386 instead we always pause all threads when removing
3387 breakpoints, so that any step-over or
3388 decr_pc_after_break adjustment is always taken
3389 care of while the breakpoint is still
3391 stop_all_lwps (1, event_child
);
3393 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3394 event_child
->exit_jump_pad_bkpt
= NULL
;
3396 unstop_all_lwps (1, event_child
);
3398 gdb_assert (event_child
->suspended
>= 0);
3402 if (event_child
->collecting_fast_tracepoint
3403 == fast_tpoint_collect_result::not_collecting
)
3406 debug_printf ("fast tracepoint finished "
3407 "collecting successfully.\n");
3409 /* We may have a deferred signal to report. */
3410 if (dequeue_one_deferred_signal (event_child
, &w
))
3413 debug_printf ("dequeued one signal.\n");
3418 debug_printf ("no deferred signals.\n");
3420 if (stabilizing_threads
)
3422 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3423 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3427 debug_printf ("linux_wait_1 ret = %s, stopped "
3428 "while stabilizing threads\n",
3429 target_pid_to_str (ptid_of (current_thread
)));
3433 return ptid_of (current_thread
);
3439 /* Check whether GDB would be interested in this event. */
3441 /* Check if GDB is interested in this syscall. */
3443 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3444 && !gdb_catch_this_syscall_p (event_child
))
3448 debug_printf ("Ignored syscall for LWP %ld.\n",
3449 lwpid_of (current_thread
));
3452 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3457 return ignore_event (ourstatus
);
3460 /* If GDB is not interested in this signal, don't stop other
3461 threads, and don't report it to GDB. Just resume the inferior
3462 right away. We do this for threading-related signals as well as
3463 any that GDB specifically requested we ignore. But never ignore
3464 SIGSTOP if we sent it ourselves, and do not ignore signals when
3465 stepping - they may require special handling to skip the signal
3466 handler. Also never ignore signals that could be caused by a
3469 && current_thread
->last_resume_kind
!= resume_step
3471 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3472 (current_process ()->priv
->thread_db
!= NULL
3473 && (WSTOPSIG (w
) == __SIGRTMIN
3474 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3477 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3478 && !(WSTOPSIG (w
) == SIGSTOP
3479 && current_thread
->last_resume_kind
== resume_stop
)
3480 && !linux_wstatus_maybe_breakpoint (w
))))
3482 siginfo_t info
, *info_p
;
3485 debug_printf ("Ignored signal %d for LWP %ld.\n",
3486 WSTOPSIG (w
), lwpid_of (current_thread
));
3488 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3489 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3494 if (step_over_finished
)
3496 /* We cancelled this thread's step-over above. We still
3497 need to unsuspend all other LWPs, and set them back
3498 running again while the signal handler runs. */
3499 unsuspend_all_lwps (event_child
);
3501 /* Enqueue the pending signal info so that proceed_all_lwps
3503 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3505 proceed_all_lwps ();
3509 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3510 WSTOPSIG (w
), info_p
);
3516 return ignore_event (ourstatus
);
3519 /* Note that all addresses are always "out of the step range" when
3520 there's no range to begin with. */
3521 in_step_range
= lwp_in_step_range (event_child
);
3523 /* If GDB wanted this thread to single step, and the thread is out
3524 of the step range, we always want to report the SIGTRAP, and let
3525 GDB handle it. Watchpoints should always be reported. So should
3526 signals we can't explain. A SIGTRAP we can't explain could be a
3527 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3528 do, we're be able to handle GDB breakpoints on top of internal
3529 breakpoints, by handling the internal breakpoint and still
3530 reporting the event to GDB. If we don't, we're out of luck, GDB
3531 won't see the breakpoint hit. If we see a single-step event but
3532 the thread should be continuing, don't pass the trap to gdb.
3533 That indicates that we had previously finished a single-step but
3534 left the single-step pending -- see
3535 complete_ongoing_step_over. */
3536 report_to_gdb
= (!maybe_internal_trap
3537 || (current_thread
->last_resume_kind
== resume_step
3539 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3541 && !bp_explains_trap
3543 && !step_over_finished
3544 && !(current_thread
->last_resume_kind
== resume_continue
3545 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3546 || (gdb_breakpoint_here (event_child
->stop_pc
)
3547 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3548 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3549 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3551 run_breakpoint_commands (event_child
->stop_pc
);
3553 /* We found no reason GDB would want us to stop. We either hit one
3554 of our own breakpoints, or finished an internal step GDB
3555 shouldn't know about. */
3560 if (bp_explains_trap
)
3561 debug_printf ("Hit a gdbserver breakpoint.\n");
3562 if (step_over_finished
)
3563 debug_printf ("Step-over finished.\n");
3565 debug_printf ("Tracepoint event.\n");
3566 if (lwp_in_step_range (event_child
))
3567 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3568 paddress (event_child
->stop_pc
),
3569 paddress (event_child
->step_range_start
),
3570 paddress (event_child
->step_range_end
));
3573 /* We're not reporting this breakpoint to GDB, so apply the
3574 decr_pc_after_break adjustment to the inferior's regcache
3577 if (the_low_target
.set_pc
!= NULL
)
3579 struct regcache
*regcache
3580 = get_thread_regcache (current_thread
, 1);
3581 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3584 if (step_over_finished
)
3586 /* If we have finished stepping over a breakpoint, we've
3587 stopped and suspended all LWPs momentarily except the
3588 stepping one. This is where we resume them all again.
3589 We're going to keep waiting, so use proceed, which
3590 handles stepping over the next breakpoint. */
3591 unsuspend_all_lwps (event_child
);
3595 /* Remove the single-step breakpoints if any. Note that
3596 there isn't single-step breakpoint if we finished stepping
3598 if (can_software_single_step ()
3599 && has_single_step_breakpoints (current_thread
))
3601 stop_all_lwps (0, event_child
);
3602 delete_single_step_breakpoints (current_thread
);
3603 unstop_all_lwps (0, event_child
);
3608 debug_printf ("proceeding all threads.\n");
3609 proceed_all_lwps ();
3614 return ignore_event (ourstatus
);
3619 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3622 = target_waitstatus_to_string (&event_child
->waitstatus
);
3624 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3625 lwpid_of (get_lwp_thread (event_child
)), str
.c_str ());
3627 if (current_thread
->last_resume_kind
== resume_step
)
3629 if (event_child
->step_range_start
== event_child
->step_range_end
)
3630 debug_printf ("GDB wanted to single-step, reporting event.\n");
3631 else if (!lwp_in_step_range (event_child
))
3632 debug_printf ("Out of step range, reporting event.\n");
3634 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3635 debug_printf ("Stopped by watchpoint.\n");
3636 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3637 debug_printf ("Stopped by GDB breakpoint.\n");
3639 debug_printf ("Hit a non-gdbserver trap event.\n");
3642 /* Alright, we're going to report a stop. */
3644 /* Remove single-step breakpoints. */
3645 if (can_software_single_step ())
3647 /* Remove single-step breakpoints or not. It it is true, stop all
3648 lwps, so that other threads won't hit the breakpoint in the
3650 int remove_single_step_breakpoints_p
= 0;
3654 remove_single_step_breakpoints_p
3655 = has_single_step_breakpoints (current_thread
);
3659 /* In all-stop, a stop reply cancels all previous resume
3660 requests. Delete all single-step breakpoints. */
3662 find_thread ([&] (thread_info
*thread
) {
3663 if (has_single_step_breakpoints (thread
))
3665 remove_single_step_breakpoints_p
= 1;
3673 if (remove_single_step_breakpoints_p
)
3675 /* If we remove single-step breakpoints from memory, stop all lwps,
3676 so that other threads won't hit the breakpoint in the staled
3678 stop_all_lwps (0, event_child
);
3682 gdb_assert (has_single_step_breakpoints (current_thread
));
3683 delete_single_step_breakpoints (current_thread
);
3687 for_each_thread ([] (thread_info
*thread
){
3688 if (has_single_step_breakpoints (thread
))
3689 delete_single_step_breakpoints (thread
);
3693 unstop_all_lwps (0, event_child
);
3697 if (!stabilizing_threads
)
3699 /* In all-stop, stop all threads. */
3701 stop_all_lwps (0, NULL
);
3703 if (step_over_finished
)
3707 /* If we were doing a step-over, all other threads but
3708 the stepping one had been paused in start_step_over,
3709 with their suspend counts incremented. We don't want
3710 to do a full unstop/unpause, because we're in
3711 all-stop mode (so we want threads stopped), but we
3712 still need to unsuspend the other threads, to
3713 decrement their `suspended' count back. */
3714 unsuspend_all_lwps (event_child
);
3718 /* If we just finished a step-over, then all threads had
3719 been momentarily paused. In all-stop, that's fine,
3720 we want threads stopped by now anyway. In non-stop,
3721 we need to re-resume threads that GDB wanted to be
3723 unstop_all_lwps (1, event_child
);
3727 /* If we're not waiting for a specific LWP, choose an event LWP
3728 from among those that have had events. Giving equal priority
3729 to all LWPs that have had events helps prevent
3731 if (ptid_equal (ptid
, minus_one_ptid
))
3733 event_child
->status_pending_p
= 1;
3734 event_child
->status_pending
= w
;
3736 select_event_lwp (&event_child
);
3738 /* current_thread and event_child must stay in sync. */
3739 current_thread
= get_lwp_thread (event_child
);
3741 event_child
->status_pending_p
= 0;
3742 w
= event_child
->status_pending
;
3746 /* Stabilize threads (move out of jump pads). */
3748 stabilize_threads ();
3752 /* If we just finished a step-over, then all threads had been
3753 momentarily paused. In all-stop, that's fine, we want
3754 threads stopped by now anyway. In non-stop, we need to
3755 re-resume threads that GDB wanted to be running. */
3756 if (step_over_finished
)
3757 unstop_all_lwps (1, event_child
);
3760 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3762 /* If the reported event is an exit, fork, vfork or exec, let
3765 /* Break the unreported fork relationship chain. */
3766 if (event_child
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
3767 || event_child
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
)
3769 event_child
->fork_relative
->fork_relative
= NULL
;
3770 event_child
->fork_relative
= NULL
;
3773 *ourstatus
= event_child
->waitstatus
;
3774 /* Clear the event lwp's waitstatus since we handled it already. */
3775 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3778 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3780 /* Now that we've selected our final event LWP, un-adjust its PC if
3781 it was a software breakpoint, and the client doesn't know we can
3782 adjust the breakpoint ourselves. */
3783 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3784 && !swbreak_feature
)
3786 int decr_pc
= the_low_target
.decr_pc_after_break
;
3790 struct regcache
*regcache
3791 = get_thread_regcache (current_thread
, 1);
3792 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3796 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3798 get_syscall_trapinfo (event_child
,
3799 &ourstatus
->value
.syscall_number
);
3800 ourstatus
->kind
= event_child
->syscall_state
;
3802 else if (current_thread
->last_resume_kind
== resume_stop
3803 && WSTOPSIG (w
) == SIGSTOP
)
3805 /* A thread that has been requested to stop by GDB with vCont;t,
3806 and it stopped cleanly, so report as SIG0. The use of
3807 SIGSTOP is an implementation detail. */
3808 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3810 else if (current_thread
->last_resume_kind
== resume_stop
3811 && WSTOPSIG (w
) != SIGSTOP
)
3813 /* A thread that has been requested to stop by GDB with vCont;t,
3814 but, it stopped for other reasons. */
3815 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3817 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3819 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3822 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3826 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3827 target_pid_to_str (ptid_of (current_thread
)),
3828 ourstatus
->kind
, ourstatus
->value
.sig
);
3832 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3833 return filter_exit_event (event_child
, ourstatus
);
3835 return ptid_of (current_thread
);
3838 /* Get rid of any pending event in the pipe. */
3840 async_file_flush (void)
3846 ret
= read (linux_event_pipe
[0], &buf
, 1);
3847 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3850 /* Put something in the pipe, so the event loop wakes up. */
3852 async_file_mark (void)
3856 async_file_flush ();
3859 ret
= write (linux_event_pipe
[1], "+", 1);
3860 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3862 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3863 be awakened anyway. */
3867 linux_wait (ptid_t ptid
,
3868 struct target_waitstatus
*ourstatus
, int target_options
)
3872 /* Flush the async file first. */
3873 if (target_is_async_p ())
3874 async_file_flush ();
3878 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3880 while ((target_options
& TARGET_WNOHANG
) == 0
3881 && ptid_equal (event_ptid
, null_ptid
)
3882 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3884 /* If at least one stop was reported, there may be more. A single
3885 SIGCHLD can signal more than one child stop. */
3886 if (target_is_async_p ()
3887 && (target_options
& TARGET_WNOHANG
) != 0
3888 && !ptid_equal (event_ptid
, null_ptid
))
3894 /* Send a signal to an LWP. */
3897 kill_lwp (unsigned long lwpid
, int signo
)
3902 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3903 if (errno
== ENOSYS
)
3905 /* If tkill fails, then we are not using nptl threads, a
3906 configuration we no longer support. */
3907 perror_with_name (("tkill"));
3913 linux_stop_lwp (struct lwp_info
*lwp
)
3919 send_sigstop (struct lwp_info
*lwp
)
3923 pid
= lwpid_of (get_lwp_thread (lwp
));
3925 /* If we already have a pending stop signal for this process, don't
3927 if (lwp
->stop_expected
)
3930 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3936 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3938 lwp
->stop_expected
= 1;
3939 kill_lwp (pid
, SIGSTOP
);
3943 send_sigstop (thread_info
*thread
, lwp_info
*except
)
3945 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3947 /* Ignore EXCEPT. */
3957 /* Increment the suspend count of an LWP, and stop it, if not stopped
3960 suspend_and_send_sigstop (thread_info
*thread
, lwp_info
*except
)
3962 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3964 /* Ignore EXCEPT. */
3968 lwp_suspended_inc (lwp
);
3970 send_sigstop (thread
, except
);
3974 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3976 /* Store the exit status for later. */
3977 lwp
->status_pending_p
= 1;
3978 lwp
->status_pending
= wstat
;
3980 /* Store in waitstatus as well, as there's nothing else to process
3982 if (WIFEXITED (wstat
))
3984 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
3985 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
3987 else if (WIFSIGNALED (wstat
))
3989 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
3990 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
3993 /* Prevent trying to stop it. */
3996 /* No further stops are expected from a dead lwp. */
3997 lwp
->stop_expected
= 0;
4000 /* Return true if LWP has exited already, and has a pending exit event
4001 to report to GDB. */
4004 lwp_is_marked_dead (struct lwp_info
*lwp
)
4006 return (lwp
->status_pending_p
4007 && (WIFEXITED (lwp
->status_pending
)
4008 || WIFSIGNALED (lwp
->status_pending
)));
4011 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4014 wait_for_sigstop (void)
4016 struct thread_info
*saved_thread
;
4021 saved_thread
= current_thread
;
4022 if (saved_thread
!= NULL
)
4023 saved_tid
= saved_thread
->id
;
4025 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4028 debug_printf ("wait_for_sigstop: pulling events\n");
4030 /* Passing NULL_PTID as filter indicates we want all events to be
4031 left pending. Eventually this returns when there are no
4032 unwaited-for children left. */
4033 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4035 gdb_assert (ret
== -1);
4037 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4038 current_thread
= saved_thread
;
4042 debug_printf ("Previously current thread died.\n");
4044 /* We can't change the current inferior behind GDB's back,
4045 otherwise, a subsequent command may apply to the wrong
4047 current_thread
= NULL
;
4051 /* Returns true if THREAD is stopped in a jump pad, and we can't
4052 move it out, because we need to report the stop event to GDB. For
4053 example, if the user puts a breakpoint in the jump pad, it's
4054 because she wants to debug it. */
4057 stuck_in_jump_pad_callback (thread_info
*thread
)
4059 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4061 if (lwp
->suspended
!= 0)
4063 internal_error (__FILE__
, __LINE__
,
4064 "LWP %ld is suspended, suspended=%d\n",
4065 lwpid_of (thread
), lwp
->suspended
);
4067 gdb_assert (lwp
->stopped
);
4069 /* Allow debugging the jump pad, gdb_collect, etc.. */
4070 return (supports_fast_tracepoints ()
4071 && agent_loaded_p ()
4072 && (gdb_breakpoint_here (lwp
->stop_pc
)
4073 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4074 || thread
->last_resume_kind
== resume_step
)
4075 && (linux_fast_tracepoint_collecting (lwp
, NULL
)
4076 != fast_tpoint_collect_result::not_collecting
));
4080 move_out_of_jump_pad_callback (thread_info
*thread
)
4082 struct thread_info
*saved_thread
;
4083 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4086 if (lwp
->suspended
!= 0)
4088 internal_error (__FILE__
, __LINE__
,
4089 "LWP %ld is suspended, suspended=%d\n",
4090 lwpid_of (thread
), lwp
->suspended
);
4092 gdb_assert (lwp
->stopped
);
4094 /* For gdb_breakpoint_here. */
4095 saved_thread
= current_thread
;
4096 current_thread
= thread
;
4098 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4100 /* Allow debugging the jump pad, gdb_collect, etc. */
4101 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4102 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4103 && thread
->last_resume_kind
!= resume_step
4104 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4107 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4112 lwp
->status_pending_p
= 0;
4113 enqueue_one_deferred_signal (lwp
, wstat
);
4116 debug_printf ("Signal %d for LWP %ld deferred "
4118 WSTOPSIG (*wstat
), lwpid_of (thread
));
4121 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4124 lwp_suspended_inc (lwp
);
4126 current_thread
= saved_thread
;
4130 lwp_running (thread_info
*thread
)
4132 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4134 if (lwp_is_marked_dead (lwp
))
4137 return !lwp
->stopped
;
4140 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4141 If SUSPEND, then also increase the suspend count of every LWP,
4145 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4147 /* Should not be called recursively. */
4148 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4153 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4154 suspend
? "stop-and-suspend" : "stop",
4156 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4160 stopping_threads
= (suspend
4161 ? STOPPING_AND_SUSPENDING_THREADS
4162 : STOPPING_THREADS
);
4165 for_each_thread ([&] (thread_info
*thread
)
4167 suspend_and_send_sigstop (thread
, except
);
4170 for_each_thread ([&] (thread_info
*thread
)
4172 send_sigstop (thread
, except
);
4175 wait_for_sigstop ();
4176 stopping_threads
= NOT_STOPPING_THREADS
;
4180 debug_printf ("stop_all_lwps done, setting stopping_threads "
4181 "back to !stopping\n");
4186 /* Enqueue one signal in the chain of signals which need to be
4187 delivered to this process on next resume. */
4190 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4192 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4194 p_sig
->prev
= lwp
->pending_signals
;
4195 p_sig
->signal
= signal
;
4197 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4199 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4200 lwp
->pending_signals
= p_sig
;
4203 /* Install breakpoints for software single stepping. */
4206 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4208 struct thread_info
*thread
= get_lwp_thread (lwp
);
4209 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4210 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
4212 current_thread
= thread
;
4213 std::vector
<CORE_ADDR
> next_pcs
= the_low_target
.get_next_pcs (regcache
);
4215 for (CORE_ADDR pc
: next_pcs
)
4216 set_single_step_breakpoint (pc
, current_ptid
);
4218 do_cleanups (old_chain
);
4221 /* Single step via hardware or software single step.
4222 Return 1 if hardware single stepping, 0 if software single stepping
4223 or can't single step. */
4226 single_step (struct lwp_info
* lwp
)
4230 if (can_hardware_single_step ())
4234 else if (can_software_single_step ())
4236 install_software_single_step_breakpoints (lwp
);
4242 debug_printf ("stepping is not implemented on this target");
4248 /* The signal can be delivered to the inferior if we are not trying to
4249 finish a fast tracepoint collect. Since signal can be delivered in
4250 the step-over, the program may go to signal handler and trap again
4251 after return from the signal handler. We can live with the spurious
4255 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4257 return (lwp
->collecting_fast_tracepoint
4258 == fast_tpoint_collect_result::not_collecting
);
4261 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4262 SIGNAL is nonzero, give it that signal. */
4265 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4266 int step
, int signal
, siginfo_t
*info
)
4268 struct thread_info
*thread
= get_lwp_thread (lwp
);
4269 struct thread_info
*saved_thread
;
4271 struct process_info
*proc
= get_thread_process (thread
);
4273 /* Note that target description may not be initialised
4274 (proc->tdesc == NULL) at this point because the program hasn't
4275 stopped at the first instruction yet. It means GDBserver skips
4276 the extra traps from the wrapper program (see option --wrapper).
4277 Code in this function that requires register access should be
4278 guarded by proc->tdesc == NULL or something else. */
4280 if (lwp
->stopped
== 0)
4283 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4285 fast_tpoint_collect_result fast_tp_collecting
4286 = lwp
->collecting_fast_tracepoint
;
4288 gdb_assert (!stabilizing_threads
4289 || (fast_tp_collecting
4290 != fast_tpoint_collect_result::not_collecting
));
4292 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4293 user used the "jump" command, or "set $pc = foo"). */
4294 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4296 /* Collecting 'while-stepping' actions doesn't make sense
4298 release_while_stepping_state_list (thread
);
4301 /* If we have pending signals or status, and a new signal, enqueue the
4302 signal. Also enqueue the signal if it can't be delivered to the
4303 inferior right now. */
4305 && (lwp
->status_pending_p
4306 || lwp
->pending_signals
!= NULL
4307 || !lwp_signal_can_be_delivered (lwp
)))
4309 enqueue_pending_signal (lwp
, signal
, info
);
4311 /* Postpone any pending signal. It was enqueued above. */
4315 if (lwp
->status_pending_p
)
4318 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4319 " has pending status\n",
4320 lwpid_of (thread
), step
? "step" : "continue",
4321 lwp
->stop_expected
? "expected" : "not expected");
4325 saved_thread
= current_thread
;
4326 current_thread
= thread
;
4328 /* This bit needs some thinking about. If we get a signal that
4329 we must report while a single-step reinsert is still pending,
4330 we often end up resuming the thread. It might be better to
4331 (ew) allow a stack of pending events; then we could be sure that
4332 the reinsert happened right away and not lose any signals.
4334 Making this stack would also shrink the window in which breakpoints are
4335 uninserted (see comment in linux_wait_for_lwp) but not enough for
4336 complete correctness, so it won't solve that problem. It may be
4337 worthwhile just to solve this one, however. */
4338 if (lwp
->bp_reinsert
!= 0)
4341 debug_printf (" pending reinsert at 0x%s\n",
4342 paddress (lwp
->bp_reinsert
));
4344 if (can_hardware_single_step ())
4346 if (fast_tp_collecting
== fast_tpoint_collect_result::not_collecting
)
4349 warning ("BAD - reinserting but not stepping.");
4351 warning ("BAD - reinserting and suspended(%d).",
4356 step
= maybe_hw_step (thread
);
4359 if (fast_tp_collecting
== fast_tpoint_collect_result::before_insn
)
4362 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4363 " (exit-jump-pad-bkpt)\n",
4366 else if (fast_tp_collecting
== fast_tpoint_collect_result::at_insn
)
4369 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4370 " single-stepping\n",
4373 if (can_hardware_single_step ())
4377 internal_error (__FILE__
, __LINE__
,
4378 "moving out of jump pad single-stepping"
4379 " not implemented on this target");
4383 /* If we have while-stepping actions in this thread set it stepping.
4384 If we have a signal to deliver, it may or may not be set to
4385 SIG_IGN, we don't know. Assume so, and allow collecting
4386 while-stepping into a signal handler. A possible smart thing to
4387 do would be to set an internal breakpoint at the signal return
4388 address, continue, and carry on catching this while-stepping
4389 action only when that breakpoint is hit. A future
4391 if (thread
->while_stepping
!= NULL
)
4394 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4397 step
= single_step (lwp
);
4400 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4402 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4404 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4408 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4409 (long) lwp
->stop_pc
);
4413 /* If we have pending signals, consume one if it can be delivered to
4415 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4417 struct pending_signals
**p_sig
;
4419 p_sig
= &lwp
->pending_signals
;
4420 while ((*p_sig
)->prev
!= NULL
)
4421 p_sig
= &(*p_sig
)->prev
;
4423 signal
= (*p_sig
)->signal
;
4424 if ((*p_sig
)->info
.si_signo
!= 0)
4425 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4433 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4434 lwpid_of (thread
), step
? "step" : "continue", signal
,
4435 lwp
->stop_expected
? "expected" : "not expected");
4437 if (the_low_target
.prepare_to_resume
!= NULL
)
4438 the_low_target
.prepare_to_resume (lwp
);
4440 regcache_invalidate_thread (thread
);
4442 lwp
->stepping
= step
;
4444 ptrace_request
= PTRACE_SINGLESTEP
;
4445 else if (gdb_catching_syscalls_p (lwp
))
4446 ptrace_request
= PTRACE_SYSCALL
;
4448 ptrace_request
= PTRACE_CONT
;
4449 ptrace (ptrace_request
,
4451 (PTRACE_TYPE_ARG3
) 0,
4452 /* Coerce to a uintptr_t first to avoid potential gcc warning
4453 of coercing an 8 byte integer to a 4 byte pointer. */
4454 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4456 current_thread
= saved_thread
;
4458 perror_with_name ("resuming thread");
4460 /* Successfully resumed. Clear state that no longer makes sense,
4461 and mark the LWP as running. Must not do this before resuming
4462 otherwise if that fails other code will be confused. E.g., we'd
4463 later try to stop the LWP and hang forever waiting for a stop
4464 status. Note that we must not throw after this is cleared,
4465 otherwise handle_zombie_lwp_error would get confused. */
4467 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4470 /* Called when we try to resume a stopped LWP and that errors out. If
4471 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4472 or about to become), discard the error, clear any pending status
4473 the LWP may have, and return true (we'll collect the exit status
4474 soon enough). Otherwise, return false. */
4477 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4479 struct thread_info
*thread
= get_lwp_thread (lp
);
4481 /* If we get an error after resuming the LWP successfully, we'd
4482 confuse !T state for the LWP being gone. */
4483 gdb_assert (lp
->stopped
);
4485 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4486 because even if ptrace failed with ESRCH, the tracee may be "not
4487 yet fully dead", but already refusing ptrace requests. In that
4488 case the tracee has 'R (Running)' state for a little bit
4489 (observed in Linux 3.18). See also the note on ESRCH in the
4490 ptrace(2) man page. Instead, check whether the LWP has any state
4491 other than ptrace-stopped. */
4493 /* Don't assume anything if /proc/PID/status can't be read. */
4494 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4496 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4497 lp
->status_pending_p
= 0;
4503 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4504 disappears while we try to resume it. */
4507 linux_resume_one_lwp (struct lwp_info
*lwp
,
4508 int step
, int signal
, siginfo_t
*info
)
4512 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4514 CATCH (ex
, RETURN_MASK_ERROR
)
4516 if (!check_ptrace_stopped_lwp_gone (lwp
))
4517 throw_exception (ex
);
4522 /* This function is called once per thread via for_each_thread.
4523 We look up which resume request applies to THREAD and mark it with a
4524 pointer to the appropriate resume request.
4526 This algorithm is O(threads * resume elements), but resume elements
4527 is small (and will remain small at least until GDB supports thread
4531 linux_set_resume_request (thread_info
*thread
, thread_resume
*resume
, size_t n
)
4533 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4535 for (int ndx
= 0; ndx
< n
; ndx
++)
4537 ptid_t ptid
= resume
[ndx
].thread
;
4538 if (ptid_equal (ptid
, minus_one_ptid
)
4539 || ptid
== thread
->id
4540 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4542 || (ptid_get_pid (ptid
) == pid_of (thread
)
4543 && (ptid_is_pid (ptid
)
4544 || ptid_get_lwp (ptid
) == -1)))
4546 if (resume
[ndx
].kind
== resume_stop
4547 && thread
->last_resume_kind
== resume_stop
)
4550 debug_printf ("already %s LWP %ld at GDB's request\n",
4551 (thread
->last_status
.kind
4552 == TARGET_WAITKIND_STOPPED
)
4560 /* Ignore (wildcard) resume requests for already-resumed
4562 if (resume
[ndx
].kind
!= resume_stop
4563 && thread
->last_resume_kind
!= resume_stop
)
4566 debug_printf ("already %s LWP %ld at GDB's request\n",
4567 (thread
->last_resume_kind
4575 /* Don't let wildcard resumes resume fork children that GDB
4576 does not yet know are new fork children. */
4577 if (lwp
->fork_relative
!= NULL
)
4579 struct lwp_info
*rel
= lwp
->fork_relative
;
4581 if (rel
->status_pending_p
4582 && (rel
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
4583 || rel
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
))
4586 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4592 /* If the thread has a pending event that has already been
4593 reported to GDBserver core, but GDB has not pulled the
4594 event out of the vStopped queue yet, likewise, ignore the
4595 (wildcard) resume request. */
4596 if (in_queued_stop_replies (thread
->id
))
4599 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4604 lwp
->resume
= &resume
[ndx
];
4605 thread
->last_resume_kind
= lwp
->resume
->kind
;
4607 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4608 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4610 /* If we had a deferred signal to report, dequeue one now.
4611 This can happen if LWP gets more than one signal while
4612 trying to get out of a jump pad. */
4614 && !lwp
->status_pending_p
4615 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4617 lwp
->status_pending_p
= 1;
4620 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4621 "leaving status pending.\n",
4622 WSTOPSIG (lwp
->status_pending
),
4630 /* No resume action for this thread. */
4634 /* find_thread callback for linux_resume. Return true if this lwp has an
4635 interesting status pending. */
4638 resume_status_pending_p (thread_info
*thread
)
4640 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4642 /* LWPs which will not be resumed are not interesting, because
4643 we might not wait for them next time through linux_wait. */
4644 if (lwp
->resume
== NULL
)
4647 return thread_still_has_status_pending_p (thread
);
4650 /* Return 1 if this lwp that GDB wants running is stopped at an
4651 internal breakpoint that we need to step over. It assumes that any
4652 required STOP_PC adjustment has already been propagated to the
4653 inferior's regcache. */
4656 need_step_over_p (thread_info
*thread
)
4658 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4659 struct thread_info
*saved_thread
;
4661 struct process_info
*proc
= get_thread_process (thread
);
4663 /* GDBserver is skipping the extra traps from the wrapper program,
4664 don't have to do step over. */
4665 if (proc
->tdesc
== NULL
)
4668 /* LWPs which will not be resumed are not interesting, because we
4669 might not wait for them next time through linux_wait. */
4674 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4679 if (thread
->last_resume_kind
== resume_stop
)
4682 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4688 gdb_assert (lwp
->suspended
>= 0);
4693 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4698 if (lwp
->status_pending_p
)
4701 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4707 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4711 /* If the PC has changed since we stopped, then don't do anything,
4712 and let the breakpoint/tracepoint be hit. This happens if, for
4713 instance, GDB handled the decr_pc_after_break subtraction itself,
4714 GDB is OOL stepping this thread, or the user has issued a "jump"
4715 command, or poked thread's registers herself. */
4716 if (pc
!= lwp
->stop_pc
)
4719 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4720 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4722 paddress (lwp
->stop_pc
), paddress (pc
));
4726 /* On software single step target, resume the inferior with signal
4727 rather than stepping over. */
4728 if (can_software_single_step ()
4729 && lwp
->pending_signals
!= NULL
4730 && lwp_signal_can_be_delivered (lwp
))
4733 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4740 saved_thread
= current_thread
;
4741 current_thread
= thread
;
4743 /* We can only step over breakpoints we know about. */
4744 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4746 /* Don't step over a breakpoint that GDB expects to hit
4747 though. If the condition is being evaluated on the target's side
4748 and it evaluate to false, step over this breakpoint as well. */
4749 if (gdb_breakpoint_here (pc
)
4750 && gdb_condition_true_at_breakpoint (pc
)
4751 && gdb_no_commands_at_breakpoint (pc
))
4754 debug_printf ("Need step over [LWP %ld]? yes, but found"
4755 " GDB breakpoint at 0x%s; skipping step over\n",
4756 lwpid_of (thread
), paddress (pc
));
4758 current_thread
= saved_thread
;
4764 debug_printf ("Need step over [LWP %ld]? yes, "
4765 "found breakpoint at 0x%s\n",
4766 lwpid_of (thread
), paddress (pc
));
4768 /* We've found an lwp that needs stepping over --- return 1 so
4769 that find_thread stops looking. */
4770 current_thread
= saved_thread
;
4776 current_thread
= saved_thread
;
4779 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4781 lwpid_of (thread
), paddress (pc
));
4786 /* Start a step-over operation on LWP. When LWP stopped at a
4787 breakpoint, to make progress, we need to remove the breakpoint out
4788 of the way. If we let other threads run while we do that, they may
4789 pass by the breakpoint location and miss hitting it. To avoid
4790 that, a step-over momentarily stops all threads while LWP is
4791 single-stepped by either hardware or software while the breakpoint
4792 is temporarily uninserted from the inferior. When the single-step
4793 finishes, we reinsert the breakpoint, and let all threads that are
4794 supposed to be running, run again. */
4797 start_step_over (struct lwp_info
*lwp
)
4799 struct thread_info
*thread
= get_lwp_thread (lwp
);
4800 struct thread_info
*saved_thread
;
4805 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4808 stop_all_lwps (1, lwp
);
4810 if (lwp
->suspended
!= 0)
4812 internal_error (__FILE__
, __LINE__
,
4813 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4818 debug_printf ("Done stopping all threads for step-over.\n");
4820 /* Note, we should always reach here with an already adjusted PC,
4821 either by GDB (if we're resuming due to GDB's request), or by our
4822 caller, if we just finished handling an internal breakpoint GDB
4823 shouldn't care about. */
4826 saved_thread
= current_thread
;
4827 current_thread
= thread
;
4829 lwp
->bp_reinsert
= pc
;
4830 uninsert_breakpoints_at (pc
);
4831 uninsert_fast_tracepoint_jumps_at (pc
);
4833 step
= single_step (lwp
);
4835 current_thread
= saved_thread
;
4837 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4839 /* Require next event from this LWP. */
4840 step_over_bkpt
= thread
->id
;
4844 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4845 start_step_over, if still there, and delete any single-step
4846 breakpoints we've set, on non hardware single-step targets. */
4849 finish_step_over (struct lwp_info
*lwp
)
4851 if (lwp
->bp_reinsert
!= 0)
4853 struct thread_info
*saved_thread
= current_thread
;
4856 debug_printf ("Finished step over.\n");
4858 current_thread
= get_lwp_thread (lwp
);
4860 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4861 may be no breakpoint to reinsert there by now. */
4862 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4863 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4865 lwp
->bp_reinsert
= 0;
4867 /* Delete any single-step breakpoints. No longer needed. We
4868 don't have to worry about other threads hitting this trap,
4869 and later not being able to explain it, because we were
4870 stepping over a breakpoint, and we hold all threads but
4871 LWP stopped while doing that. */
4872 if (!can_hardware_single_step ())
4874 gdb_assert (has_single_step_breakpoints (current_thread
));
4875 delete_single_step_breakpoints (current_thread
);
4878 step_over_bkpt
= null_ptid
;
4879 current_thread
= saved_thread
;
4886 /* If there's a step over in progress, wait until all threads stop
4887 (that is, until the stepping thread finishes its step), and
4888 unsuspend all lwps. The stepping thread ends with its status
4889 pending, which is processed later when we get back to processing
4893 complete_ongoing_step_over (void)
4895 if (!ptid_equal (step_over_bkpt
, null_ptid
))
4897 struct lwp_info
*lwp
;
4902 debug_printf ("detach: step over in progress, finish it first\n");
4904 /* Passing NULL_PTID as filter indicates we want all events to
4905 be left pending. Eventually this returns when there are no
4906 unwaited-for children left. */
4907 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4909 gdb_assert (ret
== -1);
4911 lwp
= find_lwp_pid (step_over_bkpt
);
4913 finish_step_over (lwp
);
4914 step_over_bkpt
= null_ptid
;
4915 unsuspend_all_lwps (lwp
);
4919 /* This function is called once per thread. We check the thread's resume
4920 request, which will tell us whether to resume, step, or leave the thread
4921 stopped; and what signal, if any, it should be sent.
4923 For threads which we aren't explicitly told otherwise, we preserve
4924 the stepping flag; this is used for stepping over gdbserver-placed
4927 If pending_flags was set in any thread, we queue any needed
4928 signals, since we won't actually resume. We already have a pending
4929 event to report, so we don't need to preserve any step requests;
4930 they should be re-issued if necessary. */
4933 linux_resume_one_thread (thread_info
*thread
, bool leave_all_stopped
)
4935 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4938 if (lwp
->resume
== NULL
)
4941 if (lwp
->resume
->kind
== resume_stop
)
4944 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4949 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
4951 /* Stop the thread, and wait for the event asynchronously,
4952 through the event loop. */
4958 debug_printf ("already stopped LWP %ld\n",
4961 /* The LWP may have been stopped in an internal event that
4962 was not meant to be notified back to GDB (e.g., gdbserver
4963 breakpoint), so we should be reporting a stop event in
4966 /* If the thread already has a pending SIGSTOP, this is a
4967 no-op. Otherwise, something later will presumably resume
4968 the thread and this will cause it to cancel any pending
4969 operation, due to last_resume_kind == resume_stop. If
4970 the thread already has a pending status to report, we
4971 will still report it the next time we wait - see
4972 status_pending_p_callback. */
4974 /* If we already have a pending signal to report, then
4975 there's no need to queue a SIGSTOP, as this means we're
4976 midway through moving the LWP out of the jumppad, and we
4977 will report the pending signal as soon as that is
4979 if (lwp
->pending_signals_to_report
== NULL
)
4983 /* For stop requests, we're done. */
4985 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4989 /* If this thread which is about to be resumed has a pending status,
4990 then don't resume it - we can just report the pending status.
4991 Likewise if it is suspended, because e.g., another thread is
4992 stepping past a breakpoint. Make sure to queue any signals that
4993 would otherwise be sent. In all-stop mode, we do this decision
4994 based on if *any* thread has a pending status. If there's a
4995 thread that needs the step-over-breakpoint dance, then don't
4996 resume any other thread but that particular one. */
4997 leave_pending
= (lwp
->suspended
4998 || lwp
->status_pending_p
4999 || leave_all_stopped
);
5001 /* If we have a new signal, enqueue the signal. */
5002 if (lwp
->resume
->sig
!= 0)
5004 siginfo_t info
, *info_p
;
5006 /* If this is the same signal we were previously stopped by,
5007 make sure to queue its siginfo. */
5008 if (WIFSTOPPED (lwp
->last_status
)
5009 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
5010 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
5011 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
5016 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
5022 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
5024 proceed_one_lwp (thread
, NULL
);
5029 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5032 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5037 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5039 struct thread_info
*need_step_over
= NULL
;
5044 debug_printf ("linux_resume:\n");
5047 for_each_thread ([&] (thread_info
*thread
)
5049 linux_set_resume_request (thread
, resume_info
, n
);
5052 /* If there is a thread which would otherwise be resumed, which has
5053 a pending status, then don't resume any threads - we can just
5054 report the pending status. Make sure to queue any signals that
5055 would otherwise be sent. In non-stop mode, we'll apply this
5056 logic to each thread individually. We consume all pending events
5057 before considering to start a step-over (in all-stop). */
5058 bool any_pending
= false;
5060 any_pending
= find_thread (resume_status_pending_p
) != NULL
;
5062 /* If there is a thread which would otherwise be resumed, which is
5063 stopped at a breakpoint that needs stepping over, then don't
5064 resume any threads - have it step over the breakpoint with all
5065 other threads stopped, then resume all threads again. Make sure
5066 to queue any signals that would otherwise be delivered or
5068 if (!any_pending
&& supports_breakpoints ())
5069 need_step_over
= find_thread (need_step_over_p
);
5071 bool leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5075 if (need_step_over
!= NULL
)
5076 debug_printf ("Not resuming all, need step over\n");
5077 else if (any_pending
)
5078 debug_printf ("Not resuming, all-stop and found "
5079 "an LWP with pending status\n");
5081 debug_printf ("Resuming, no pending status or step over needed\n");
5084 /* Even if we're leaving threads stopped, queue all signals we'd
5085 otherwise deliver. */
5086 for_each_thread ([&] (thread_info
*thread
)
5088 linux_resume_one_thread (thread
, leave_all_stopped
);
5092 start_step_over (get_thread_lwp (need_step_over
));
5096 debug_printf ("linux_resume done\n");
5100 /* We may have events that were pending that can/should be sent to
5101 the client now. Trigger a linux_wait call. */
5102 if (target_is_async_p ())
5106 /* This function is called once per thread. We check the thread's
5107 last resume request, which will tell us whether to resume, step, or
5108 leave the thread stopped. Any signal the client requested to be
5109 delivered has already been enqueued at this point.
5111 If any thread that GDB wants running is stopped at an internal
5112 breakpoint that needs stepping over, we start a step-over operation
5113 on that particular thread, and leave all others stopped. */
5116 proceed_one_lwp (thread_info
*thread
, lwp_info
*except
)
5118 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5125 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5130 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5134 if (thread
->last_resume_kind
== resume_stop
5135 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5138 debug_printf (" client wants LWP to remain %ld stopped\n",
5143 if (lwp
->status_pending_p
)
5146 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5151 gdb_assert (lwp
->suspended
>= 0);
5156 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5160 if (thread
->last_resume_kind
== resume_stop
5161 && lwp
->pending_signals_to_report
== NULL
5162 && (lwp
->collecting_fast_tracepoint
5163 == fast_tpoint_collect_result::not_collecting
))
5165 /* We haven't reported this LWP as stopped yet (otherwise, the
5166 last_status.kind check above would catch it, and we wouldn't
5167 reach here. This LWP may have been momentarily paused by a
5168 stop_all_lwps call while handling for example, another LWP's
5169 step-over. In that case, the pending expected SIGSTOP signal
5170 that was queued at vCont;t handling time will have already
5171 been consumed by wait_for_sigstop, and so we need to requeue
5172 another one here. Note that if the LWP already has a SIGSTOP
5173 pending, this is a no-op. */
5176 debug_printf ("Client wants LWP %ld to stop. "
5177 "Making sure it has a SIGSTOP pending\n",
5183 if (thread
->last_resume_kind
== resume_step
)
5186 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5189 /* If resume_step is requested by GDB, install single-step
5190 breakpoints when the thread is about to be actually resumed if
5191 the single-step breakpoints weren't removed. */
5192 if (can_software_single_step ()
5193 && !has_single_step_breakpoints (thread
))
5194 install_software_single_step_breakpoints (lwp
);
5196 step
= maybe_hw_step (thread
);
5198 else if (lwp
->bp_reinsert
!= 0)
5201 debug_printf (" stepping LWP %ld, reinsert set\n",
5204 step
= maybe_hw_step (thread
);
5209 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5213 unsuspend_and_proceed_one_lwp (thread_info
*thread
, lwp_info
*except
)
5215 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5220 lwp_suspended_decr (lwp
);
5222 proceed_one_lwp (thread
, except
);
5225 /* When we finish a step-over, set threads running again. If there's
5226 another thread that may need a step-over, now's the time to start
5227 it. Eventually, we'll move all threads past their breakpoints. */
5230 proceed_all_lwps (void)
5232 struct thread_info
*need_step_over
;
5234 /* If there is a thread which would otherwise be resumed, which is
5235 stopped at a breakpoint that needs stepping over, then don't
5236 resume any threads - have it step over the breakpoint with all
5237 other threads stopped, then resume all threads again. */
5239 if (supports_breakpoints ())
5241 need_step_over
= find_thread (need_step_over_p
);
5243 if (need_step_over
!= NULL
)
5246 debug_printf ("proceed_all_lwps: found "
5247 "thread %ld needing a step-over\n",
5248 lwpid_of (need_step_over
));
5250 start_step_over (get_thread_lwp (need_step_over
));
5256 debug_printf ("Proceeding, no step-over needed\n");
5258 for_each_thread ([] (thread_info
*thread
)
5260 proceed_one_lwp (thread
, NULL
);
5264 /* Stopped LWPs that the client wanted to be running, that don't have
5265 pending statuses, are set to run again, except for EXCEPT, if not
5266 NULL. This undoes a stop_all_lwps call. */
5269 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5275 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5276 lwpid_of (get_lwp_thread (except
)));
5278 debug_printf ("unstopping all lwps\n");
5282 for_each_thread ([&] (thread_info
*thread
)
5284 unsuspend_and_proceed_one_lwp (thread
, except
);
5287 for_each_thread ([&] (thread_info
*thread
)
5289 proceed_one_lwp (thread
, except
);
5294 debug_printf ("unstop_all_lwps done\n");
5300 #ifdef HAVE_LINUX_REGSETS
5302 #define use_linux_regsets 1
5304 /* Returns true if REGSET has been disabled. */
5307 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5309 return (info
->disabled_regsets
!= NULL
5310 && info
->disabled_regsets
[regset
- info
->regsets
]);
5313 /* Disable REGSET. */
5316 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5320 dr_offset
= regset
- info
->regsets
;
5321 if (info
->disabled_regsets
== NULL
)
5322 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5323 info
->disabled_regsets
[dr_offset
] = 1;
5327 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5328 struct regcache
*regcache
)
5330 struct regset_info
*regset
;
5331 int saw_general_regs
= 0;
5335 pid
= lwpid_of (current_thread
);
5336 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5341 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5344 buf
= xmalloc (regset
->size
);
5346 nt_type
= regset
->nt_type
;
5350 iov
.iov_len
= regset
->size
;
5351 data
= (void *) &iov
;
5357 res
= ptrace (regset
->get_request
, pid
,
5358 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5360 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5366 /* If we get EIO on a regset, do not try it again for
5367 this process mode. */
5368 disable_regset (regsets_info
, regset
);
5370 else if (errno
== ENODATA
)
5372 /* ENODATA may be returned if the regset is currently
5373 not "active". This can happen in normal operation,
5374 so suppress the warning in this case. */
5376 else if (errno
== ESRCH
)
5378 /* At this point, ESRCH should mean the process is
5379 already gone, in which case we simply ignore attempts
5380 to read its registers. */
5385 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5392 if (regset
->type
== GENERAL_REGS
)
5393 saw_general_regs
= 1;
5394 regset
->store_function (regcache
, buf
);
5398 if (saw_general_regs
)
5405 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5406 struct regcache
*regcache
)
5408 struct regset_info
*regset
;
5409 int saw_general_regs
= 0;
5413 pid
= lwpid_of (current_thread
);
5414 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5419 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5420 || regset
->fill_function
== NULL
)
5423 buf
= xmalloc (regset
->size
);
5425 /* First fill the buffer with the current register set contents,
5426 in case there are any items in the kernel's regset that are
5427 not in gdbserver's regcache. */
5429 nt_type
= regset
->nt_type
;
5433 iov
.iov_len
= regset
->size
;
5434 data
= (void *) &iov
;
5440 res
= ptrace (regset
->get_request
, pid
,
5441 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5443 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5448 /* Then overlay our cached registers on that. */
5449 regset
->fill_function (regcache
, buf
);
5451 /* Only now do we write the register set. */
5453 res
= ptrace (regset
->set_request
, pid
,
5454 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5456 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5464 /* If we get EIO on a regset, do not try it again for
5465 this process mode. */
5466 disable_regset (regsets_info
, regset
);
5468 else if (errno
== ESRCH
)
5470 /* At this point, ESRCH should mean the process is
5471 already gone, in which case we simply ignore attempts
5472 to change its registers. See also the related
5473 comment in linux_resume_one_lwp. */
5479 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5482 else if (regset
->type
== GENERAL_REGS
)
5483 saw_general_regs
= 1;
5486 if (saw_general_regs
)
5492 #else /* !HAVE_LINUX_REGSETS */
5494 #define use_linux_regsets 0
5495 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5496 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5500 /* Return 1 if register REGNO is supported by one of the regset ptrace
5501 calls or 0 if it has to be transferred individually. */
5504 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5506 unsigned char mask
= 1 << (regno
% 8);
5507 size_t index
= regno
/ 8;
5509 return (use_linux_regsets
5510 && (regs_info
->regset_bitmap
== NULL
5511 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5514 #ifdef HAVE_LINUX_USRREGS
5517 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5521 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5522 error ("Invalid register number %d.", regnum
);
5524 addr
= usrregs
->regmap
[regnum
];
5529 /* Fetch one register. */
5531 fetch_register (const struct usrregs_info
*usrregs
,
5532 struct regcache
*regcache
, int regno
)
5539 if (regno
>= usrregs
->num_regs
)
5541 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5544 regaddr
= register_addr (usrregs
, regno
);
5548 size
= ((register_size (regcache
->tdesc
, regno
)
5549 + sizeof (PTRACE_XFER_TYPE
) - 1)
5550 & -sizeof (PTRACE_XFER_TYPE
));
5551 buf
= (char *) alloca (size
);
5553 pid
= lwpid_of (current_thread
);
5554 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5557 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5558 ptrace (PTRACE_PEEKUSER
, pid
,
5559 /* Coerce to a uintptr_t first to avoid potential gcc warning
5560 of coercing an 8 byte integer to a 4 byte pointer. */
5561 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5562 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5565 /* Mark register REGNO unavailable. */
5566 supply_register (regcache
, regno
, NULL
);
5571 if (the_low_target
.supply_ptrace_register
)
5572 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5574 supply_register (regcache
, regno
, buf
);
5577 /* Store one register. */
5579 store_register (const struct usrregs_info
*usrregs
,
5580 struct regcache
*regcache
, int regno
)
5587 if (regno
>= usrregs
->num_regs
)
5589 if ((*the_low_target
.cannot_store_register
) (regno
))
5592 regaddr
= register_addr (usrregs
, regno
);
5596 size
= ((register_size (regcache
->tdesc
, regno
)
5597 + sizeof (PTRACE_XFER_TYPE
) - 1)
5598 & -sizeof (PTRACE_XFER_TYPE
));
5599 buf
= (char *) alloca (size
);
5600 memset (buf
, 0, size
);
5602 if (the_low_target
.collect_ptrace_register
)
5603 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5605 collect_register (regcache
, regno
, buf
);
5607 pid
= lwpid_of (current_thread
);
5608 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5611 ptrace (PTRACE_POKEUSER
, pid
,
5612 /* Coerce to a uintptr_t first to avoid potential gcc warning
5613 about coercing an 8 byte integer to a 4 byte pointer. */
5614 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5615 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5618 /* At this point, ESRCH should mean the process is
5619 already gone, in which case we simply ignore attempts
5620 to change its registers. See also the related
5621 comment in linux_resume_one_lwp. */
5625 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5626 error ("writing register %d: %s", regno
, strerror (errno
));
5628 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5632 /* Fetch all registers, or just one, from the child process.
5633 If REGNO is -1, do this for all registers, skipping any that are
5634 assumed to have been retrieved by regsets_fetch_inferior_registers,
5635 unless ALL is non-zero.
5636 Otherwise, REGNO specifies which register (so we can save time). */
5638 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5639 struct regcache
*regcache
, int regno
, int all
)
5641 struct usrregs_info
*usr
= regs_info
->usrregs
;
5645 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5646 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5647 fetch_register (usr
, regcache
, regno
);
5650 fetch_register (usr
, regcache
, regno
);
5653 /* Store our register values back into the inferior.
5654 If REGNO is -1, do this for all registers, skipping any that are
5655 assumed to have been saved by regsets_store_inferior_registers,
5656 unless ALL is non-zero.
5657 Otherwise, REGNO specifies which register (so we can save time). */
5659 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5660 struct regcache
*regcache
, int regno
, int all
)
5662 struct usrregs_info
*usr
= regs_info
->usrregs
;
5666 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5667 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5668 store_register (usr
, regcache
, regno
);
5671 store_register (usr
, regcache
, regno
);
5674 #else /* !HAVE_LINUX_USRREGS */
5676 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5677 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5683 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5687 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5691 if (the_low_target
.fetch_register
!= NULL
5692 && regs_info
->usrregs
!= NULL
)
5693 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5694 (*the_low_target
.fetch_register
) (regcache
, regno
);
5696 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5697 if (regs_info
->usrregs
!= NULL
)
5698 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5702 if (the_low_target
.fetch_register
!= NULL
5703 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5706 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5708 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5710 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5711 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5716 linux_store_registers (struct regcache
*regcache
, int regno
)
5720 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5724 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5726 if (regs_info
->usrregs
!= NULL
)
5727 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5731 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5733 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5735 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5736 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5741 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5742 to debugger memory starting at MYADDR. */
5745 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5747 int pid
= lwpid_of (current_thread
);
5748 PTRACE_XFER_TYPE
*buffer
;
5756 /* Try using /proc. Don't bother for one word. */
5757 if (len
>= 3 * sizeof (long))
5761 /* We could keep this file open and cache it - possibly one per
5762 thread. That requires some juggling, but is even faster. */
5763 sprintf (filename
, "/proc/%d/mem", pid
);
5764 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5768 /* If pread64 is available, use it. It's faster if the kernel
5769 supports it (only one syscall), and it's 64-bit safe even on
5770 32-bit platforms (for instance, SPARC debugging a SPARC64
5773 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5776 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5777 bytes
= read (fd
, myaddr
, len
);
5784 /* Some data was read, we'll try to get the rest with ptrace. */
5794 /* Round starting address down to longword boundary. */
5795 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5796 /* Round ending address up; get number of longwords that makes. */
5797 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5798 / sizeof (PTRACE_XFER_TYPE
));
5799 /* Allocate buffer of that many longwords. */
5800 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5802 /* Read all the longwords */
5804 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5806 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5807 about coercing an 8 byte integer to a 4 byte pointer. */
5808 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5809 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5810 (PTRACE_TYPE_ARG4
) 0);
5816 /* Copy appropriate bytes out of the buffer. */
5819 i
*= sizeof (PTRACE_XFER_TYPE
);
5820 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5822 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5829 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5830 memory at MEMADDR. On failure (cannot write to the inferior)
5831 returns the value of errno. Always succeeds if LEN is zero. */
5834 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5837 /* Round starting address down to longword boundary. */
5838 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5839 /* Round ending address up; get number of longwords that makes. */
5841 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5842 / sizeof (PTRACE_XFER_TYPE
);
5844 /* Allocate buffer of that many longwords. */
5845 PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5847 int pid
= lwpid_of (current_thread
);
5851 /* Zero length write always succeeds. */
5857 /* Dump up to four bytes. */
5858 char str
[4 * 2 + 1];
5860 int dump
= len
< 4 ? len
: 4;
5862 for (i
= 0; i
< dump
; i
++)
5864 sprintf (p
, "%02x", myaddr
[i
]);
5869 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5870 str
, (long) memaddr
, pid
);
5873 /* Fill start and end extra bytes of buffer with existing memory data. */
5876 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5877 about coercing an 8 byte integer to a 4 byte pointer. */
5878 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5879 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5880 (PTRACE_TYPE_ARG4
) 0);
5888 = ptrace (PTRACE_PEEKTEXT
, pid
,
5889 /* Coerce to a uintptr_t first to avoid potential gcc warning
5890 about coercing an 8 byte integer to a 4 byte pointer. */
5891 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5892 * sizeof (PTRACE_XFER_TYPE
)),
5893 (PTRACE_TYPE_ARG4
) 0);
5898 /* Copy data to be written over corresponding part of buffer. */
5900 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5903 /* Write the entire buffer. */
5905 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5908 ptrace (PTRACE_POKETEXT
, pid
,
5909 /* Coerce to a uintptr_t first to avoid potential gcc warning
5910 about coercing an 8 byte integer to a 4 byte pointer. */
5911 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5912 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5921 linux_look_up_symbols (void)
5923 #ifdef USE_THREAD_DB
5924 struct process_info
*proc
= current_process ();
5926 if (proc
->priv
->thread_db
!= NULL
)
5934 linux_request_interrupt (void)
5936 /* Send a SIGINT to the process group. This acts just like the user
5937 typed a ^C on the controlling terminal. */
5938 kill (-signal_pid
, SIGINT
);
5941 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5942 to debugger memory starting at MYADDR. */
5945 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5947 char filename
[PATH_MAX
];
5949 int pid
= lwpid_of (current_thread
);
5951 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5953 fd
= open (filename
, O_RDONLY
);
5957 if (offset
!= (CORE_ADDR
) 0
5958 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5961 n
= read (fd
, myaddr
, len
);
5968 /* These breakpoint and watchpoint related wrapper functions simply
5969 pass on the function call if the target has registered a
5970 corresponding function. */
5973 linux_supports_z_point_type (char z_type
)
5975 return (the_low_target
.supports_z_point_type
!= NULL
5976 && the_low_target
.supports_z_point_type (z_type
));
5980 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5981 int size
, struct raw_breakpoint
*bp
)
5983 if (type
== raw_bkpt_type_sw
)
5984 return insert_memory_breakpoint (bp
);
5985 else if (the_low_target
.insert_point
!= NULL
)
5986 return the_low_target
.insert_point (type
, addr
, size
, bp
);
5988 /* Unsupported (see target.h). */
5993 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5994 int size
, struct raw_breakpoint
*bp
)
5996 if (type
== raw_bkpt_type_sw
)
5997 return remove_memory_breakpoint (bp
);
5998 else if (the_low_target
.remove_point
!= NULL
)
5999 return the_low_target
.remove_point (type
, addr
, size
, bp
);
6001 /* Unsupported (see target.h). */
6005 /* Implement the to_stopped_by_sw_breakpoint target_ops
6009 linux_stopped_by_sw_breakpoint (void)
6011 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6013 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
6016 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
6020 linux_supports_stopped_by_sw_breakpoint (void)
6022 return USE_SIGTRAP_SIGINFO
;
6025 /* Implement the to_stopped_by_hw_breakpoint target_ops
6029 linux_stopped_by_hw_breakpoint (void)
6031 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6033 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6036 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6040 linux_supports_stopped_by_hw_breakpoint (void)
6042 return USE_SIGTRAP_SIGINFO
;
6045 /* Implement the supports_hardware_single_step target_ops method. */
6048 linux_supports_hardware_single_step (void)
6050 return can_hardware_single_step ();
6054 linux_supports_software_single_step (void)
6056 return can_software_single_step ();
6060 linux_stopped_by_watchpoint (void)
6062 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6064 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6068 linux_stopped_data_address (void)
6070 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6072 return lwp
->stopped_data_address
;
6075 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6076 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6077 && defined(PT_TEXT_END_ADDR)
6079 /* This is only used for targets that define PT_TEXT_ADDR,
6080 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6081 the target has different ways of acquiring this information, like
6084 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6085 to tell gdb about. */
6088 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6090 unsigned long text
, text_end
, data
;
6091 int pid
= lwpid_of (current_thread
);
6095 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6096 (PTRACE_TYPE_ARG4
) 0);
6097 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6098 (PTRACE_TYPE_ARG4
) 0);
6099 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6100 (PTRACE_TYPE_ARG4
) 0);
6104 /* Both text and data offsets produced at compile-time (and so
6105 used by gdb) are relative to the beginning of the program,
6106 with the data segment immediately following the text segment.
6107 However, the actual runtime layout in memory may put the data
6108 somewhere else, so when we send gdb a data base-address, we
6109 use the real data base address and subtract the compile-time
6110 data base-address from it (which is just the length of the
6111 text segment). BSS immediately follows data in both
6114 *data_p
= data
- (text_end
- text
);
6123 linux_qxfer_osdata (const char *annex
,
6124 unsigned char *readbuf
, unsigned const char *writebuf
,
6125 CORE_ADDR offset
, int len
)
6127 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6130 /* Convert a native/host siginfo object, into/from the siginfo in the
6131 layout of the inferiors' architecture. */
6134 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6138 if (the_low_target
.siginfo_fixup
!= NULL
)
6139 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6141 /* If there was no callback, or the callback didn't do anything,
6142 then just do a straight memcpy. */
6146 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6148 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6153 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6154 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6158 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6160 if (current_thread
== NULL
)
6163 pid
= lwpid_of (current_thread
);
6166 debug_printf ("%s siginfo for lwp %d.\n",
6167 readbuf
!= NULL
? "Reading" : "Writing",
6170 if (offset
>= sizeof (siginfo
))
6173 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6176 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6177 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6178 inferior with a 64-bit GDBSERVER should look the same as debugging it
6179 with a 32-bit GDBSERVER, we need to convert it. */
6180 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6182 if (offset
+ len
> sizeof (siginfo
))
6183 len
= sizeof (siginfo
) - offset
;
6185 if (readbuf
!= NULL
)
6186 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6189 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6191 /* Convert back to ptrace layout before flushing it out. */
6192 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6194 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6201 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6202 so we notice when children change state; as the handler for the
6203 sigsuspend in my_waitpid. */
6206 sigchld_handler (int signo
)
6208 int old_errno
= errno
;
6214 /* fprintf is not async-signal-safe, so call write
6216 if (write (2, "sigchld_handler\n",
6217 sizeof ("sigchld_handler\n") - 1) < 0)
6218 break; /* just ignore */
6222 if (target_is_async_p ())
6223 async_file_mark (); /* trigger a linux_wait */
6229 linux_supports_non_stop (void)
6235 linux_async (int enable
)
6237 int previous
= target_is_async_p ();
6240 debug_printf ("linux_async (%d), previous=%d\n",
6243 if (previous
!= enable
)
6246 sigemptyset (&mask
);
6247 sigaddset (&mask
, SIGCHLD
);
6249 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6253 if (pipe (linux_event_pipe
) == -1)
6255 linux_event_pipe
[0] = -1;
6256 linux_event_pipe
[1] = -1;
6257 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6259 warning ("creating event pipe failed.");
6263 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6264 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6266 /* Register the event loop handler. */
6267 add_file_handler (linux_event_pipe
[0],
6268 handle_target_event
, NULL
);
6270 /* Always trigger a linux_wait. */
6275 delete_file_handler (linux_event_pipe
[0]);
6277 close (linux_event_pipe
[0]);
6278 close (linux_event_pipe
[1]);
6279 linux_event_pipe
[0] = -1;
6280 linux_event_pipe
[1] = -1;
6283 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6290 linux_start_non_stop (int nonstop
)
6292 /* Register or unregister from event-loop accordingly. */
6293 linux_async (nonstop
);
6295 if (target_is_async_p () != (nonstop
!= 0))
6302 linux_supports_multi_process (void)
6307 /* Check if fork events are supported. */
6310 linux_supports_fork_events (void)
6312 return linux_supports_tracefork ();
6315 /* Check if vfork events are supported. */
6318 linux_supports_vfork_events (void)
6320 return linux_supports_tracefork ();
6323 /* Check if exec events are supported. */
6326 linux_supports_exec_events (void)
6328 return linux_supports_traceexec ();
6331 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6332 ptrace flags for all inferiors. This is in case the new GDB connection
6333 doesn't support the same set of events that the previous one did. */
6336 linux_handle_new_gdb_connection (void)
6338 /* Request that all the lwps reset their ptrace options. */
6339 for_each_thread ([] (thread_info
*thread
)
6341 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6345 /* Stop the lwp so we can modify its ptrace options. */
6346 lwp
->must_set_ptrace_flags
= 1;
6347 linux_stop_lwp (lwp
);
6351 /* Already stopped; go ahead and set the ptrace options. */
6352 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6353 int options
= linux_low_ptrace_options (proc
->attached
);
6355 linux_enable_event_reporting (lwpid_of (thread
), options
);
6356 lwp
->must_set_ptrace_flags
= 0;
6362 linux_supports_disable_randomization (void)
6364 #ifdef HAVE_PERSONALITY
6372 linux_supports_agent (void)
6378 linux_supports_range_stepping (void)
6380 if (can_software_single_step ())
6382 if (*the_low_target
.supports_range_stepping
== NULL
)
6385 return (*the_low_target
.supports_range_stepping
) ();
6388 /* Enumerate spufs IDs for process PID. */
6390 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6396 struct dirent
*entry
;
6398 sprintf (path
, "/proc/%ld/fd", pid
);
6399 dir
= opendir (path
);
6404 while ((entry
= readdir (dir
)) != NULL
)
6410 fd
= atoi (entry
->d_name
);
6414 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6415 if (stat (path
, &st
) != 0)
6417 if (!S_ISDIR (st
.st_mode
))
6420 if (statfs (path
, &stfs
) != 0)
6422 if (stfs
.f_type
!= SPUFS_MAGIC
)
6425 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6427 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6437 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6438 object type, using the /proc file system. */
6440 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6441 unsigned const char *writebuf
,
6442 CORE_ADDR offset
, int len
)
6444 long pid
= lwpid_of (current_thread
);
6449 if (!writebuf
&& !readbuf
)
6457 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6460 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6461 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6466 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6473 ret
= write (fd
, writebuf
, (size_t) len
);
6475 ret
= read (fd
, readbuf
, (size_t) len
);
6481 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6482 struct target_loadseg
6484 /* Core address to which the segment is mapped. */
6486 /* VMA recorded in the program header. */
6488 /* Size of this segment in memory. */
6492 # if defined PT_GETDSBT
6493 struct target_loadmap
6495 /* Protocol version number, must be zero. */
6497 /* Pointer to the DSBT table, its size, and the DSBT index. */
6498 unsigned *dsbt_table
;
6499 unsigned dsbt_size
, dsbt_index
;
6500 /* Number of segments in this map. */
6502 /* The actual memory map. */
6503 struct target_loadseg segs
[/*nsegs*/];
6505 # define LINUX_LOADMAP PT_GETDSBT
6506 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6507 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6509 struct target_loadmap
6511 /* Protocol version number, must be zero. */
6513 /* Number of segments in this map. */
6515 /* The actual memory map. */
6516 struct target_loadseg segs
[/*nsegs*/];
6518 # define LINUX_LOADMAP PTRACE_GETFDPIC
6519 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6520 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6524 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6525 unsigned char *myaddr
, unsigned int len
)
6527 int pid
= lwpid_of (current_thread
);
6529 struct target_loadmap
*data
= NULL
;
6530 unsigned int actual_length
, copy_length
;
6532 if (strcmp (annex
, "exec") == 0)
6533 addr
= (int) LINUX_LOADMAP_EXEC
;
6534 else if (strcmp (annex
, "interp") == 0)
6535 addr
= (int) LINUX_LOADMAP_INTERP
;
6539 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6545 actual_length
= sizeof (struct target_loadmap
)
6546 + sizeof (struct target_loadseg
) * data
->nsegs
;
6548 if (offset
< 0 || offset
> actual_length
)
6551 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6552 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6556 # define linux_read_loadmap NULL
6557 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6560 linux_process_qsupported (char **features
, int count
)
6562 if (the_low_target
.process_qsupported
!= NULL
)
6563 the_low_target
.process_qsupported (features
, count
);
6567 linux_supports_catch_syscall (void)
6569 return (the_low_target
.get_syscall_trapinfo
!= NULL
6570 && linux_supports_tracesysgood ());
6574 linux_get_ipa_tdesc_idx (void)
6576 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6579 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6583 linux_supports_tracepoints (void)
6585 if (*the_low_target
.supports_tracepoints
== NULL
)
6588 return (*the_low_target
.supports_tracepoints
) ();
6592 linux_read_pc (struct regcache
*regcache
)
6594 if (the_low_target
.get_pc
== NULL
)
6597 return (*the_low_target
.get_pc
) (regcache
);
6601 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6603 gdb_assert (the_low_target
.set_pc
!= NULL
);
6605 (*the_low_target
.set_pc
) (regcache
, pc
);
6609 linux_thread_stopped (struct thread_info
*thread
)
6611 return get_thread_lwp (thread
)->stopped
;
6614 /* This exposes stop-all-threads functionality to other modules. */
6617 linux_pause_all (int freeze
)
6619 stop_all_lwps (freeze
, NULL
);
6622 /* This exposes unstop-all-threads functionality to other gdbserver
6626 linux_unpause_all (int unfreeze
)
6628 unstop_all_lwps (unfreeze
, NULL
);
6632 linux_prepare_to_access_memory (void)
6634 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6637 linux_pause_all (1);
6642 linux_done_accessing_memory (void)
6644 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6647 linux_unpause_all (1);
6651 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6652 CORE_ADDR collector
,
6655 CORE_ADDR
*jump_entry
,
6656 CORE_ADDR
*trampoline
,
6657 ULONGEST
*trampoline_size
,
6658 unsigned char *jjump_pad_insn
,
6659 ULONGEST
*jjump_pad_insn_size
,
6660 CORE_ADDR
*adjusted_insn_addr
,
6661 CORE_ADDR
*adjusted_insn_addr_end
,
6664 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6665 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6666 jump_entry
, trampoline
, trampoline_size
,
6667 jjump_pad_insn
, jjump_pad_insn_size
,
6668 adjusted_insn_addr
, adjusted_insn_addr_end
,
6672 static struct emit_ops
*
6673 linux_emit_ops (void)
6675 if (the_low_target
.emit_ops
!= NULL
)
6676 return (*the_low_target
.emit_ops
) ();
6682 linux_get_min_fast_tracepoint_insn_len (void)
6684 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6687 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6690 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6691 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6693 char filename
[PATH_MAX
];
6695 const int auxv_size
= is_elf64
6696 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6697 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6699 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6701 fd
= open (filename
, O_RDONLY
);
6707 while (read (fd
, buf
, auxv_size
) == auxv_size
6708 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6712 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6714 switch (aux
->a_type
)
6717 *phdr_memaddr
= aux
->a_un
.a_val
;
6720 *num_phdr
= aux
->a_un
.a_val
;
6726 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6728 switch (aux
->a_type
)
6731 *phdr_memaddr
= aux
->a_un
.a_val
;
6734 *num_phdr
= aux
->a_un
.a_val
;
6742 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6744 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6745 "phdr_memaddr = %ld, phdr_num = %d",
6746 (long) *phdr_memaddr
, *num_phdr
);
6753 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6756 get_dynamic (const int pid
, const int is_elf64
)
6758 CORE_ADDR phdr_memaddr
, relocation
;
6760 unsigned char *phdr_buf
;
6761 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6763 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6766 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6767 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6769 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6772 /* Compute relocation: it is expected to be 0 for "regular" executables,
6773 non-zero for PIE ones. */
6775 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6778 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6780 if (p
->p_type
== PT_PHDR
)
6781 relocation
= phdr_memaddr
- p
->p_vaddr
;
6785 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6787 if (p
->p_type
== PT_PHDR
)
6788 relocation
= phdr_memaddr
- p
->p_vaddr
;
6791 if (relocation
== -1)
6793 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6794 any real world executables, including PIE executables, have always
6795 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6796 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6797 or present DT_DEBUG anyway (fpc binaries are statically linked).
6799 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6801 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6806 for (i
= 0; i
< num_phdr
; i
++)
6810 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6812 if (p
->p_type
== PT_DYNAMIC
)
6813 return p
->p_vaddr
+ relocation
;
6817 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6819 if (p
->p_type
== PT_DYNAMIC
)
6820 return p
->p_vaddr
+ relocation
;
6827 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6828 can be 0 if the inferior does not yet have the library list initialized.
6829 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6830 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6833 get_r_debug (const int pid
, const int is_elf64
)
6835 CORE_ADDR dynamic_memaddr
;
6836 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6837 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6840 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6841 if (dynamic_memaddr
== 0)
6844 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6848 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6849 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6853 unsigned char buf
[sizeof (Elf64_Xword
)];
6857 #ifdef DT_MIPS_RLD_MAP
6858 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6860 if (linux_read_memory (dyn
->d_un
.d_val
,
6861 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6866 #endif /* DT_MIPS_RLD_MAP */
6867 #ifdef DT_MIPS_RLD_MAP_REL
6868 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6870 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6871 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6876 #endif /* DT_MIPS_RLD_MAP_REL */
6878 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6879 map
= dyn
->d_un
.d_val
;
6881 if (dyn
->d_tag
== DT_NULL
)
6886 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6887 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6891 unsigned char buf
[sizeof (Elf32_Word
)];
6895 #ifdef DT_MIPS_RLD_MAP
6896 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6898 if (linux_read_memory (dyn
->d_un
.d_val
,
6899 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6904 #endif /* DT_MIPS_RLD_MAP */
6905 #ifdef DT_MIPS_RLD_MAP_REL
6906 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6908 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6909 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6914 #endif /* DT_MIPS_RLD_MAP_REL */
6916 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6917 map
= dyn
->d_un
.d_val
;
6919 if (dyn
->d_tag
== DT_NULL
)
6923 dynamic_memaddr
+= dyn_size
;
6929 /* Read one pointer from MEMADDR in the inferior. */
6932 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6936 /* Go through a union so this works on either big or little endian
6937 hosts, when the inferior's pointer size is smaller than the size
6938 of CORE_ADDR. It is assumed the inferior's endianness is the
6939 same of the superior's. */
6942 CORE_ADDR core_addr
;
6947 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6950 if (ptr_size
== sizeof (CORE_ADDR
))
6951 *ptr
= addr
.core_addr
;
6952 else if (ptr_size
== sizeof (unsigned int))
6955 gdb_assert_not_reached ("unhandled pointer size");
6960 struct link_map_offsets
6962 /* Offset and size of r_debug.r_version. */
6963 int r_version_offset
;
6965 /* Offset and size of r_debug.r_map. */
6968 /* Offset to l_addr field in struct link_map. */
6971 /* Offset to l_name field in struct link_map. */
6974 /* Offset to l_ld field in struct link_map. */
6977 /* Offset to l_next field in struct link_map. */
6980 /* Offset to l_prev field in struct link_map. */
6984 /* Construct qXfer:libraries-svr4:read reply. */
6987 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
6988 unsigned const char *writebuf
,
6989 CORE_ADDR offset
, int len
)
6992 unsigned document_len
;
6993 struct process_info_private
*const priv
= current_process ()->priv
;
6994 char filename
[PATH_MAX
];
6997 static const struct link_map_offsets lmo_32bit_offsets
=
6999 0, /* r_version offset. */
7000 4, /* r_debug.r_map offset. */
7001 0, /* l_addr offset in link_map. */
7002 4, /* l_name offset in link_map. */
7003 8, /* l_ld offset in link_map. */
7004 12, /* l_next offset in link_map. */
7005 16 /* l_prev offset in link_map. */
7008 static const struct link_map_offsets lmo_64bit_offsets
=
7010 0, /* r_version offset. */
7011 8, /* r_debug.r_map offset. */
7012 0, /* l_addr offset in link_map. */
7013 8, /* l_name offset in link_map. */
7014 16, /* l_ld offset in link_map. */
7015 24, /* l_next offset in link_map. */
7016 32 /* l_prev offset in link_map. */
7018 const struct link_map_offsets
*lmo
;
7019 unsigned int machine
;
7021 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7022 int allocated
= 1024;
7024 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7025 int header_done
= 0;
7027 if (writebuf
!= NULL
)
7029 if (readbuf
== NULL
)
7032 pid
= lwpid_of (current_thread
);
7033 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7034 is_elf64
= elf_64_file_p (filename
, &machine
);
7035 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7036 ptr_size
= is_elf64
? 8 : 4;
7038 while (annex
[0] != '\0')
7044 sep
= strchr (annex
, '=');
7049 if (len
== 5 && startswith (annex
, "start"))
7051 else if (len
== 4 && startswith (annex
, "prev"))
7055 annex
= strchr (sep
, ';');
7062 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7069 if (priv
->r_debug
== 0)
7070 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7072 /* We failed to find DT_DEBUG. Such situation will not change
7073 for this inferior - do not retry it. Report it to GDB as
7074 E01, see for the reasons at the GDB solib-svr4.c side. */
7075 if (priv
->r_debug
== (CORE_ADDR
) -1)
7078 if (priv
->r_debug
!= 0)
7080 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7081 (unsigned char *) &r_version
,
7082 sizeof (r_version
)) != 0
7085 warning ("unexpected r_debug version %d", r_version
);
7087 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7088 &lm_addr
, ptr_size
) != 0)
7090 warning ("unable to read r_map from 0x%lx",
7091 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7096 document
= (char *) xmalloc (allocated
);
7097 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7098 p
= document
+ strlen (document
);
7101 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7102 &l_name
, ptr_size
) == 0
7103 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7104 &l_addr
, ptr_size
) == 0
7105 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7106 &l_ld
, ptr_size
) == 0
7107 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7108 &l_prev
, ptr_size
) == 0
7109 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7110 &l_next
, ptr_size
) == 0)
7112 unsigned char libname
[PATH_MAX
];
7114 if (lm_prev
!= l_prev
)
7116 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7117 (long) lm_prev
, (long) l_prev
);
7121 /* Ignore the first entry even if it has valid name as the first entry
7122 corresponds to the main executable. The first entry should not be
7123 skipped if the dynamic loader was loaded late by a static executable
7124 (see solib-svr4.c parameter ignore_first). But in such case the main
7125 executable does not have PT_DYNAMIC present and this function already
7126 exited above due to failed get_r_debug. */
7129 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7134 /* Not checking for error because reading may stop before
7135 we've got PATH_MAX worth of characters. */
7137 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7138 libname
[sizeof (libname
) - 1] = '\0';
7139 if (libname
[0] != '\0')
7141 /* 6x the size for xml_escape_text below. */
7142 size_t len
= 6 * strlen ((char *) libname
);
7146 /* Terminate `<library-list-svr4'. */
7151 while (allocated
< p
- document
+ len
+ 200)
7153 /* Expand to guarantee sufficient storage. */
7154 uintptr_t document_len
= p
- document
;
7156 document
= (char *) xrealloc (document
, 2 * allocated
);
7158 p
= document
+ document_len
;
7161 std::string name
= xml_escape_text ((char *) libname
);
7162 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7163 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7164 name
.c_str (), (unsigned long) lm_addr
,
7165 (unsigned long) l_addr
, (unsigned long) l_ld
);
7175 /* Empty list; terminate `<library-list-svr4'. */
7179 strcpy (p
, "</library-list-svr4>");
7181 document_len
= strlen (document
);
7182 if (offset
< document_len
)
7183 document_len
-= offset
;
7186 if (len
> document_len
)
7189 memcpy (readbuf
, document
+ offset
, len
);
7195 #ifdef HAVE_LINUX_BTRACE
7197 /* See to_disable_btrace target method. */
7200 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7202 enum btrace_error err
;
7204 err
= linux_disable_btrace (tinfo
);
7205 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7208 /* Encode an Intel Processor Trace configuration. */
7211 linux_low_encode_pt_config (struct buffer
*buffer
,
7212 const struct btrace_data_pt_config
*config
)
7214 buffer_grow_str (buffer
, "<pt-config>\n");
7216 switch (config
->cpu
.vendor
)
7219 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7220 "model=\"%u\" stepping=\"%u\"/>\n",
7221 config
->cpu
.family
, config
->cpu
.model
,
7222 config
->cpu
.stepping
);
7229 buffer_grow_str (buffer
, "</pt-config>\n");
7232 /* Encode a raw buffer. */
7235 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7241 /* We use hex encoding - see common/rsp-low.h. */
7242 buffer_grow_str (buffer
, "<raw>\n");
7248 elem
[0] = tohex ((*data
>> 4) & 0xf);
7249 elem
[1] = tohex (*data
++ & 0xf);
7251 buffer_grow (buffer
, elem
, 2);
7254 buffer_grow_str (buffer
, "</raw>\n");
7257 /* See to_read_btrace target method. */
7260 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7261 enum btrace_read_type type
)
7263 struct btrace_data btrace
;
7264 struct btrace_block
*block
;
7265 enum btrace_error err
;
7268 btrace_data_init (&btrace
);
7270 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7271 if (err
!= BTRACE_ERR_NONE
)
7273 if (err
== BTRACE_ERR_OVERFLOW
)
7274 buffer_grow_str0 (buffer
, "E.Overflow.");
7276 buffer_grow_str0 (buffer
, "E.Generic Error.");
7281 switch (btrace
.format
)
7283 case BTRACE_FORMAT_NONE
:
7284 buffer_grow_str0 (buffer
, "E.No Trace.");
7287 case BTRACE_FORMAT_BTS
:
7288 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7289 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7292 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7294 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7295 paddress (block
->begin
), paddress (block
->end
));
7297 buffer_grow_str0 (buffer
, "</btrace>\n");
7300 case BTRACE_FORMAT_PT
:
7301 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7302 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7303 buffer_grow_str (buffer
, "<pt>\n");
7305 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7307 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7308 btrace
.variant
.pt
.size
);
7310 buffer_grow_str (buffer
, "</pt>\n");
7311 buffer_grow_str0 (buffer
, "</btrace>\n");
7315 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7319 btrace_data_fini (&btrace
);
7323 btrace_data_fini (&btrace
);
7327 /* See to_btrace_conf target method. */
7330 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7331 struct buffer
*buffer
)
7333 const struct btrace_config
*conf
;
7335 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7336 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7338 conf
= linux_btrace_conf (tinfo
);
7341 switch (conf
->format
)
7343 case BTRACE_FORMAT_NONE
:
7346 case BTRACE_FORMAT_BTS
:
7347 buffer_xml_printf (buffer
, "<bts");
7348 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7349 buffer_xml_printf (buffer
, " />\n");
7352 case BTRACE_FORMAT_PT
:
7353 buffer_xml_printf (buffer
, "<pt");
7354 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7355 buffer_xml_printf (buffer
, "/>\n");
7360 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7363 #endif /* HAVE_LINUX_BTRACE */
7365 /* See nat/linux-nat.h. */
7368 current_lwp_ptid (void)
7370 return ptid_of (current_thread
);
7373 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7376 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7378 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7379 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7381 return default_breakpoint_kind_from_pc (pcptr
);
7384 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7386 static const gdb_byte
*
7387 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7389 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7391 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7394 /* Implementation of the target_ops method
7395 "breakpoint_kind_from_current_state". */
7398 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7400 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7401 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7403 return linux_breakpoint_kind_from_pc (pcptr
);
7406 /* Default implementation of linux_target_ops method "set_pc" for
7407 32-bit pc register which is literally named "pc". */
7410 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7412 uint32_t newpc
= pc
;
7414 supply_register_by_name (regcache
, "pc", &newpc
);
7417 /* Default implementation of linux_target_ops method "get_pc" for
7418 32-bit pc register which is literally named "pc". */
7421 linux_get_pc_32bit (struct regcache
*regcache
)
7425 collect_register_by_name (regcache
, "pc", &pc
);
7427 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7431 /* Default implementation of linux_target_ops method "set_pc" for
7432 64-bit pc register which is literally named "pc". */
7435 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7437 uint64_t newpc
= pc
;
7439 supply_register_by_name (regcache
, "pc", &newpc
);
7442 /* Default implementation of linux_target_ops method "get_pc" for
7443 64-bit pc register which is literally named "pc". */
7446 linux_get_pc_64bit (struct regcache
*regcache
)
7450 collect_register_by_name (regcache
, "pc", &pc
);
7452 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7457 static struct target_ops linux_target_ops
= {
7458 linux_create_inferior
,
7459 linux_post_create_inferior
,
7468 linux_fetch_registers
,
7469 linux_store_registers
,
7470 linux_prepare_to_access_memory
,
7471 linux_done_accessing_memory
,
7474 linux_look_up_symbols
,
7475 linux_request_interrupt
,
7477 linux_supports_z_point_type
,
7480 linux_stopped_by_sw_breakpoint
,
7481 linux_supports_stopped_by_sw_breakpoint
,
7482 linux_stopped_by_hw_breakpoint
,
7483 linux_supports_stopped_by_hw_breakpoint
,
7484 linux_supports_hardware_single_step
,
7485 linux_stopped_by_watchpoint
,
7486 linux_stopped_data_address
,
7487 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7488 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7489 && defined(PT_TEXT_END_ADDR)
7494 #ifdef USE_THREAD_DB
7495 thread_db_get_tls_address
,
7500 hostio_last_error_from_errno
,
7503 linux_supports_non_stop
,
7505 linux_start_non_stop
,
7506 linux_supports_multi_process
,
7507 linux_supports_fork_events
,
7508 linux_supports_vfork_events
,
7509 linux_supports_exec_events
,
7510 linux_handle_new_gdb_connection
,
7511 #ifdef USE_THREAD_DB
7512 thread_db_handle_monitor_command
,
7516 linux_common_core_of_thread
,
7518 linux_process_qsupported
,
7519 linux_supports_tracepoints
,
7522 linux_thread_stopped
,
7526 linux_stabilize_threads
,
7527 linux_install_fast_tracepoint_jump_pad
,
7529 linux_supports_disable_randomization
,
7530 linux_get_min_fast_tracepoint_insn_len
,
7531 linux_qxfer_libraries_svr4
,
7532 linux_supports_agent
,
7533 #ifdef HAVE_LINUX_BTRACE
7534 linux_supports_btrace
,
7535 linux_enable_btrace
,
7536 linux_low_disable_btrace
,
7537 linux_low_read_btrace
,
7538 linux_low_btrace_conf
,
7546 linux_supports_range_stepping
,
7547 linux_proc_pid_to_exec_file
,
7548 linux_mntns_open_cloexec
,
7550 linux_mntns_readlink
,
7551 linux_breakpoint_kind_from_pc
,
7552 linux_sw_breakpoint_from_kind
,
7553 linux_proc_tid_get_name
,
7554 linux_breakpoint_kind_from_current_state
,
7555 linux_supports_software_single_step
,
7556 linux_supports_catch_syscall
,
7557 linux_get_ipa_tdesc_idx
,
7559 thread_db_thread_handle
,
7565 #ifdef HAVE_LINUX_REGSETS
7567 initialize_regsets_info (struct regsets_info
*info
)
7569 for (info
->num_regsets
= 0;
7570 info
->regsets
[info
->num_regsets
].size
>= 0;
7571 info
->num_regsets
++)
7577 initialize_low (void)
7579 struct sigaction sigchld_action
;
7581 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7582 set_target_ops (&linux_target_ops
);
7584 linux_ptrace_init_warnings ();
7586 sigchld_action
.sa_handler
= sigchld_handler
;
7587 sigemptyset (&sigchld_action
.sa_mask
);
7588 sigchld_action
.sa_flags
= SA_RESTART
;
7589 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7591 initialize_low_arch ();
7593 linux_check_ptrace_features ();