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
;
664 thread_db_notice_clone (event_thr
, ptid
);
666 /* Don't report the event. */
669 else if (event
== PTRACE_EVENT_VFORK_DONE
)
671 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
673 if (event_lwp
->bp_reinsert
!= 0 && can_software_single_step ())
675 reinsert_single_step_breakpoints (event_thr
);
677 gdb_assert (has_single_step_breakpoints (event_thr
));
680 /* Report the event. */
683 else if (event
== PTRACE_EVENT_EXEC
&& report_exec_events
)
685 struct process_info
*proc
;
686 std::vector
<int> syscalls_to_catch
;
692 debug_printf ("HEW: Got exec event from LWP %ld\n",
693 lwpid_of (event_thr
));
696 /* Get the event ptid. */
697 event_ptid
= ptid_of (event_thr
);
698 event_pid
= ptid_get_pid (event_ptid
);
700 /* Save the syscall list from the execing process. */
701 proc
= get_thread_process (event_thr
);
702 syscalls_to_catch
= std::move (proc
->syscalls_to_catch
);
704 /* Delete the execing process and all its threads. */
706 current_thread
= NULL
;
708 /* Create a new process/lwp/thread. */
709 proc
= linux_add_process (event_pid
, 0);
710 event_lwp
= add_lwp (event_ptid
);
711 event_thr
= get_lwp_thread (event_lwp
);
712 gdb_assert (current_thread
== event_thr
);
713 linux_arch_setup_thread (event_thr
);
715 /* Set the event status. */
716 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
717 event_lwp
->waitstatus
.value
.execd_pathname
718 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
720 /* Mark the exec status as pending. */
721 event_lwp
->stopped
= 1;
722 event_lwp
->status_pending_p
= 1;
723 event_lwp
->status_pending
= wstat
;
724 event_thr
->last_resume_kind
= resume_continue
;
725 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
727 /* Update syscall state in the new lwp, effectively mid-syscall too. */
728 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
730 /* Restore the list to catch. Don't rely on the client, which is free
731 to avoid sending a new list when the architecture doesn't change.
732 Also, for ANY_SYSCALL, the architecture doesn't really matter. */
733 proc
->syscalls_to_catch
= std::move (syscalls_to_catch
);
735 /* Report the event. */
736 *orig_event_lwp
= event_lwp
;
740 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
743 /* Return the PC as read from the regcache of LWP, without any
747 get_pc (struct lwp_info
*lwp
)
749 struct thread_info
*saved_thread
;
750 struct regcache
*regcache
;
753 if (the_low_target
.get_pc
== NULL
)
756 saved_thread
= current_thread
;
757 current_thread
= get_lwp_thread (lwp
);
759 regcache
= get_thread_regcache (current_thread
, 1);
760 pc
= (*the_low_target
.get_pc
) (regcache
);
763 debug_printf ("pc is 0x%lx\n", (long) pc
);
765 current_thread
= saved_thread
;
769 /* This function should only be called if LWP got a SYSCALL_SIGTRAP.
770 Fill *SYSNO with the syscall nr trapped. */
773 get_syscall_trapinfo (struct lwp_info
*lwp
, int *sysno
)
775 struct thread_info
*saved_thread
;
776 struct regcache
*regcache
;
778 if (the_low_target
.get_syscall_trapinfo
== NULL
)
780 /* If we cannot get the syscall trapinfo, report an unknown
781 system call number. */
782 *sysno
= UNKNOWN_SYSCALL
;
786 saved_thread
= current_thread
;
787 current_thread
= get_lwp_thread (lwp
);
789 regcache
= get_thread_regcache (current_thread
, 1);
790 (*the_low_target
.get_syscall_trapinfo
) (regcache
, sysno
);
793 debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno
);
795 current_thread
= saved_thread
;
798 static int check_stopped_by_watchpoint (struct lwp_info
*child
);
800 /* Called when the LWP stopped for a signal/trap. If it stopped for a
801 trap check what caused it (breakpoint, watchpoint, trace, etc.),
802 and save the result in the LWP's stop_reason field. If it stopped
803 for a breakpoint, decrement the PC if necessary on the lwp's
804 architecture. Returns true if we now have the LWP's stop PC. */
807 save_stop_reason (struct lwp_info
*lwp
)
810 CORE_ADDR sw_breakpoint_pc
;
811 struct thread_info
*saved_thread
;
812 #if USE_SIGTRAP_SIGINFO
816 if (the_low_target
.get_pc
== NULL
)
820 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
822 /* breakpoint_at reads from the current thread. */
823 saved_thread
= current_thread
;
824 current_thread
= get_lwp_thread (lwp
);
826 #if USE_SIGTRAP_SIGINFO
827 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
828 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
830 if (siginfo
.si_signo
== SIGTRAP
)
832 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
)
833 && GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
835 /* The si_code is ambiguous on this arch -- check debug
837 if (!check_stopped_by_watchpoint (lwp
))
838 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
840 else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
842 /* If we determine the LWP stopped for a SW breakpoint,
843 trust it. Particularly don't check watchpoint
844 registers, because at least on s390, we'd find
845 stopped-by-watchpoint as long as there's a watchpoint
847 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
849 else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
851 /* This can indicate either a hardware breakpoint or
852 hardware watchpoint. Check debug registers. */
853 if (!check_stopped_by_watchpoint (lwp
))
854 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
856 else if (siginfo
.si_code
== TRAP_TRACE
)
858 /* We may have single stepped an instruction that
859 triggered a watchpoint. In that case, on some
860 architectures (such as x86), instead of TRAP_HWBKPT,
861 si_code indicates TRAP_TRACE, and we need to check
862 the debug registers separately. */
863 if (!check_stopped_by_watchpoint (lwp
))
864 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
869 /* We may have just stepped a breakpoint instruction. E.g., in
870 non-stop mode, GDB first tells the thread A to step a range, and
871 then the user inserts a breakpoint inside the range. In that
872 case we need to report the breakpoint PC. */
873 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
874 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
875 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
877 if (hardware_breakpoint_inserted_here (pc
))
878 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
880 if (lwp
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
)
881 check_stopped_by_watchpoint (lwp
);
884 if (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
888 struct thread_info
*thr
= get_lwp_thread (lwp
);
890 debug_printf ("CSBB: %s stopped by software breakpoint\n",
891 target_pid_to_str (ptid_of (thr
)));
894 /* Back up the PC if necessary. */
895 if (pc
!= sw_breakpoint_pc
)
897 struct regcache
*regcache
898 = get_thread_regcache (current_thread
, 1);
899 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
902 /* Update this so we record the correct stop PC below. */
903 pc
= sw_breakpoint_pc
;
905 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
)
909 struct thread_info
*thr
= get_lwp_thread (lwp
);
911 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
912 target_pid_to_str (ptid_of (thr
)));
915 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
919 struct thread_info
*thr
= get_lwp_thread (lwp
);
921 debug_printf ("CSBB: %s stopped by hardware watchpoint\n",
922 target_pid_to_str (ptid_of (thr
)));
925 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
)
929 struct thread_info
*thr
= get_lwp_thread (lwp
);
931 debug_printf ("CSBB: %s stopped by trace\n",
932 target_pid_to_str (ptid_of (thr
)));
937 current_thread
= saved_thread
;
941 static struct lwp_info
*
942 add_lwp (ptid_t ptid
)
944 struct lwp_info
*lwp
;
946 lwp
= XCNEW (struct lwp_info
);
948 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
950 if (the_low_target
.new_thread
!= NULL
)
951 the_low_target
.new_thread (lwp
);
953 lwp
->thread
= add_thread (ptid
, lwp
);
958 /* Callback to be used when calling fork_inferior, responsible for
959 actually initiating the tracing of the inferior. */
964 if (ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0,
965 (PTRACE_TYPE_ARG4
) 0) < 0)
966 trace_start_error_with_name ("ptrace");
968 if (setpgid (0, 0) < 0)
969 trace_start_error_with_name ("setpgid");
971 /* If GDBserver is connected to gdb via stdio, redirect the inferior's
972 stdout to stderr so that inferior i/o doesn't corrupt the connection.
973 Also, redirect stdin to /dev/null. */
974 if (remote_connection_is_stdio ())
977 trace_start_error_with_name ("close");
978 if (open ("/dev/null", O_RDONLY
) < 0)
979 trace_start_error_with_name ("open");
981 trace_start_error_with_name ("dup2");
982 if (write (2, "stdin/stdout redirected\n",
983 sizeof ("stdin/stdout redirected\n") - 1) < 0)
985 /* Errors ignored. */;
990 /* Start an inferior process and returns its pid.
991 PROGRAM is the name of the program to be started, and PROGRAM_ARGS
992 are its arguments. */
995 linux_create_inferior (const char *program
,
996 const std::vector
<char *> &program_args
)
998 struct lwp_info
*new_lwp
;
1003 maybe_disable_address_space_randomization restore_personality
1004 (disable_randomization
);
1005 std::string str_program_args
= stringify_argv (program_args
);
1007 pid
= fork_inferior (program
,
1008 str_program_args
.c_str (),
1009 get_environ ()->envp (), linux_ptrace_fun
,
1010 NULL
, NULL
, NULL
, NULL
);
1013 linux_add_process (pid
, 0);
1015 ptid
= ptid_build (pid
, pid
, 0);
1016 new_lwp
= add_lwp (ptid
);
1017 new_lwp
->must_set_ptrace_flags
= 1;
1019 post_fork_inferior (pid
, program
);
1024 /* Implement the post_create_inferior target_ops method. */
1027 linux_post_create_inferior (void)
1029 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
1031 linux_arch_setup ();
1033 if (lwp
->must_set_ptrace_flags
)
1035 struct process_info
*proc
= current_process ();
1036 int options
= linux_low_ptrace_options (proc
->attached
);
1038 linux_enable_event_reporting (lwpid_of (current_thread
), options
);
1039 lwp
->must_set_ptrace_flags
= 0;
1043 /* Attach to an inferior process. Returns 0 on success, ERRNO on
1047 linux_attach_lwp (ptid_t ptid
)
1049 struct lwp_info
*new_lwp
;
1050 int lwpid
= ptid_get_lwp (ptid
);
1052 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
1056 new_lwp
= add_lwp (ptid
);
1058 /* We need to wait for SIGSTOP before being able to make the next
1059 ptrace call on this LWP. */
1060 new_lwp
->must_set_ptrace_flags
= 1;
1062 if (linux_proc_pid_is_stopped (lwpid
))
1065 debug_printf ("Attached to a stopped process\n");
1067 /* The process is definitely stopped. It is in a job control
1068 stop, unless the kernel predates the TASK_STOPPED /
1069 TASK_TRACED distinction, in which case it might be in a
1070 ptrace stop. Make sure it is in a ptrace stop; from there we
1071 can kill it, signal it, et cetera.
1073 First make sure there is a pending SIGSTOP. Since we are
1074 already attached, the process can not transition from stopped
1075 to running without a PTRACE_CONT; so we know this signal will
1076 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1077 probably already in the queue (unless this kernel is old
1078 enough to use TASK_STOPPED for ptrace stops); but since
1079 SIGSTOP is not an RT signal, it can only be queued once. */
1080 kill_lwp (lwpid
, SIGSTOP
);
1082 /* Finally, resume the stopped process. This will deliver the
1083 SIGSTOP (or a higher priority signal, just like normal
1084 PTRACE_ATTACH), which we'll catch later on. */
1085 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1088 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
1089 brings it to a halt.
1091 There are several cases to consider here:
1093 1) gdbserver has already attached to the process and is being notified
1094 of a new thread that is being created.
1095 In this case we should ignore that SIGSTOP and resume the
1096 process. This is handled below by setting stop_expected = 1,
1097 and the fact that add_thread sets last_resume_kind ==
1100 2) This is the first thread (the process thread), and we're attaching
1101 to it via attach_inferior.
1102 In this case we want the process thread to stop.
1103 This is handled by having linux_attach set last_resume_kind ==
1104 resume_stop after we return.
1106 If the pid we are attaching to is also the tgid, we attach to and
1107 stop all the existing threads. Otherwise, we attach to pid and
1108 ignore any other threads in the same group as this pid.
1110 3) GDB is connecting to gdbserver and is requesting an enumeration of all
1112 In this case we want the thread to stop.
1113 FIXME: This case is currently not properly handled.
1114 We should wait for the SIGSTOP but don't. Things work apparently
1115 because enough time passes between when we ptrace (ATTACH) and when
1116 gdb makes the next ptrace call on the thread.
1118 On the other hand, if we are currently trying to stop all threads, we
1119 should treat the new thread as if we had sent it a SIGSTOP. This works
1120 because we are guaranteed that the add_lwp call above added us to the
1121 end of the list, and so the new thread has not yet reached
1122 wait_for_sigstop (but will). */
1123 new_lwp
->stop_expected
= 1;
1128 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
1129 already attached. Returns true if a new LWP is found, false
1133 attach_proc_task_lwp_callback (ptid_t ptid
)
1135 /* Is this a new thread? */
1136 if (find_thread_ptid (ptid
) == NULL
)
1138 int lwpid
= ptid_get_lwp (ptid
);
1142 debug_printf ("Found new lwp %d\n", lwpid
);
1144 err
= linux_attach_lwp (ptid
);
1146 /* Be quiet if we simply raced with the thread exiting. EPERM
1147 is returned if the thread's task still exists, and is marked
1148 as exited or zombie, as well as other conditions, so in that
1149 case, confirm the status in /proc/PID/status. */
1151 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1155 debug_printf ("Cannot attach to lwp %d: "
1156 "thread is gone (%d: %s)\n",
1157 lwpid
, err
, strerror (err
));
1163 = linux_ptrace_attach_fail_reason_string (ptid
, err
);
1165 warning (_("Cannot attach to lwp %d: %s"), lwpid
, reason
.c_str ());
1173 static void async_file_mark (void);
1175 /* Attach to PID. If PID is the tgid, attach to it and all
1179 linux_attach (unsigned long pid
)
1181 struct process_info
*proc
;
1182 struct thread_info
*initial_thread
;
1183 ptid_t ptid
= ptid_build (pid
, pid
, 0);
1186 /* Attach to PID. We will check for other threads
1188 err
= linux_attach_lwp (ptid
);
1191 std::string reason
= linux_ptrace_attach_fail_reason_string (ptid
, err
);
1193 error ("Cannot attach to process %ld: %s", pid
, reason
.c_str ());
1196 proc
= linux_add_process (pid
, 1);
1198 /* Don't ignore the initial SIGSTOP if we just attached to this
1199 process. It will be collected by wait shortly. */
1200 initial_thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
1201 initial_thread
->last_resume_kind
= resume_stop
;
1203 /* We must attach to every LWP. If /proc is mounted, use that to
1204 find them now. On the one hand, the inferior may be using raw
1205 clone instead of using pthreads. On the other hand, even if it
1206 is using pthreads, GDB may not be connected yet (thread_db needs
1207 to do symbol lookups, through qSymbol). Also, thread_db walks
1208 structures in the inferior's address space to find the list of
1209 threads/LWPs, and those structures may well be corrupted. Note
1210 that once thread_db is loaded, we'll still use it to list threads
1211 and associate pthread info with each LWP. */
1212 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1214 /* GDB will shortly read the xml target description for this
1215 process, to figure out the process' architecture. But the target
1216 description is only filled in when the first process/thread in
1217 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1218 that now, otherwise, if GDB is fast enough, it could read the
1219 target description _before_ that initial stop. */
1222 struct lwp_info
*lwp
;
1224 ptid_t pid_ptid
= pid_to_ptid (pid
);
1226 lwpid
= linux_wait_for_event_filtered (pid_ptid
, pid_ptid
,
1228 gdb_assert (lwpid
> 0);
1230 lwp
= find_lwp_pid (pid_to_ptid (lwpid
));
1232 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGSTOP
)
1234 lwp
->status_pending_p
= 1;
1235 lwp
->status_pending
= wstat
;
1238 initial_thread
->last_resume_kind
= resume_continue
;
1242 gdb_assert (proc
->tdesc
!= NULL
);
1249 last_thread_of_process_p (int pid
)
1251 bool seen_one
= false;
1253 thread_info
*thread
= find_thread (pid
, [&] (thread_info
*thread
)
1257 /* This is the first thread of this process we see. */
1263 /* This is the second thread of this process we see. */
1268 return thread
== NULL
;
1274 linux_kill_one_lwp (struct lwp_info
*lwp
)
1276 struct thread_info
*thr
= get_lwp_thread (lwp
);
1277 int pid
= lwpid_of (thr
);
1279 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1280 there is no signal context, and ptrace(PTRACE_KILL) (or
1281 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1282 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1283 alternative is to kill with SIGKILL. We only need one SIGKILL
1284 per process, not one for each thread. But since we still support
1285 support debugging programs using raw clone without CLONE_THREAD,
1286 we send one for each thread. For years, we used PTRACE_KILL
1287 only, so we're being a bit paranoid about some old kernels where
1288 PTRACE_KILL might work better (dubious if there are any such, but
1289 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1290 second, and so we're fine everywhere. */
1293 kill_lwp (pid
, SIGKILL
);
1296 int save_errno
= errno
;
1298 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1299 target_pid_to_str (ptid_of (thr
)),
1300 save_errno
? strerror (save_errno
) : "OK");
1304 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1307 int save_errno
= errno
;
1309 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1310 target_pid_to_str (ptid_of (thr
)),
1311 save_errno
? strerror (save_errno
) : "OK");
1315 /* Kill LWP and wait for it to die. */
1318 kill_wait_lwp (struct lwp_info
*lwp
)
1320 struct thread_info
*thr
= get_lwp_thread (lwp
);
1321 int pid
= ptid_get_pid (ptid_of (thr
));
1322 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1327 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1331 linux_kill_one_lwp (lwp
);
1333 /* Make sure it died. Notes:
1335 - The loop is most likely unnecessary.
1337 - We don't use linux_wait_for_event as that could delete lwps
1338 while we're iterating over them. We're not interested in
1339 any pending status at this point, only in making sure all
1340 wait status on the kernel side are collected until the
1343 - We don't use __WALL here as the __WALL emulation relies on
1344 SIGCHLD, and killing a stopped process doesn't generate
1345 one, nor an exit status.
1347 res
= my_waitpid (lwpid
, &wstat
, 0);
1348 if (res
== -1 && errno
== ECHILD
)
1349 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1350 } while (res
> 0 && WIFSTOPPED (wstat
));
1352 /* Even if it was stopped, the child may have already disappeared.
1353 E.g., if it was killed by SIGKILL. */
1354 if (res
< 0 && errno
!= ECHILD
)
1355 perror_with_name ("kill_wait_lwp");
1358 /* Callback for `for_each_thread'. Kills an lwp of a given process,
1359 except the leader. */
1362 kill_one_lwp_callback (thread_info
*thread
, int pid
)
1364 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1366 /* We avoid killing the first thread here, because of a Linux kernel (at
1367 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1368 the children get a chance to be reaped, it will remain a zombie
1371 if (lwpid_of (thread
) == pid
)
1374 debug_printf ("lkop: is last of process %s\n",
1375 target_pid_to_str (thread
->id
));
1379 kill_wait_lwp (lwp
);
1383 linux_kill (int pid
)
1385 struct process_info
*process
;
1386 struct lwp_info
*lwp
;
1388 process
= find_process_pid (pid
);
1389 if (process
== NULL
)
1392 /* If we're killing a running inferior, make sure it is stopped
1393 first, as PTRACE_KILL will not work otherwise. */
1394 stop_all_lwps (0, NULL
);
1396 for_each_thread (pid
, [&] (thread_info
*thread
)
1398 kill_one_lwp_callback (thread
, pid
);
1401 /* See the comment in linux_kill_one_lwp. We did not kill the first
1402 thread in the list, so do so now. */
1403 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1408 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1412 kill_wait_lwp (lwp
);
1414 the_target
->mourn (process
);
1416 /* Since we presently can only stop all lwps of all processes, we
1417 need to unstop lwps of other processes. */
1418 unstop_all_lwps (0, NULL
);
1422 /* Get pending signal of THREAD, for detaching purposes. This is the
1423 signal the thread last stopped for, which we need to deliver to the
1424 thread when detaching, otherwise, it'd be suppressed/lost. */
1427 get_detach_signal (struct thread_info
*thread
)
1429 enum gdb_signal signo
= GDB_SIGNAL_0
;
1431 struct lwp_info
*lp
= get_thread_lwp (thread
);
1433 if (lp
->status_pending_p
)
1434 status
= lp
->status_pending
;
1437 /* If the thread had been suspended by gdbserver, and it stopped
1438 cleanly, then it'll have stopped with SIGSTOP. But we don't
1439 want to deliver that SIGSTOP. */
1440 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1441 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1444 /* Otherwise, we may need to deliver the signal we
1446 status
= lp
->last_status
;
1449 if (!WIFSTOPPED (status
))
1452 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1453 target_pid_to_str (ptid_of (thread
)));
1457 /* Extended wait statuses aren't real SIGTRAPs. */
1458 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1461 debug_printf ("GPS: lwp %s had stopped with extended "
1462 "status: no pending signal\n",
1463 target_pid_to_str (ptid_of (thread
)));
1467 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1469 if (program_signals_p
&& !program_signals
[signo
])
1472 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1473 target_pid_to_str (ptid_of (thread
)),
1474 gdb_signal_to_string (signo
));
1477 else if (!program_signals_p
1478 /* If we have no way to know which signals GDB does not
1479 want to have passed to the program, assume
1480 SIGTRAP/SIGINT, which is GDB's default. */
1481 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1484 debug_printf ("GPS: lwp %s had signal %s, "
1485 "but we don't know if we should pass it. "
1486 "Default to not.\n",
1487 target_pid_to_str (ptid_of (thread
)),
1488 gdb_signal_to_string (signo
));
1494 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1495 target_pid_to_str (ptid_of (thread
)),
1496 gdb_signal_to_string (signo
));
1498 return WSTOPSIG (status
);
1502 /* Detach from LWP. */
1505 linux_detach_one_lwp (struct lwp_info
*lwp
)
1507 struct thread_info
*thread
= get_lwp_thread (lwp
);
1511 /* If there is a pending SIGSTOP, get rid of it. */
1512 if (lwp
->stop_expected
)
1515 debug_printf ("Sending SIGCONT to %s\n",
1516 target_pid_to_str (ptid_of (thread
)));
1518 kill_lwp (lwpid_of (thread
), SIGCONT
);
1519 lwp
->stop_expected
= 0;
1522 /* Pass on any pending signal for this thread. */
1523 sig
= get_detach_signal (thread
);
1525 /* Preparing to resume may try to write registers, and fail if the
1526 lwp is zombie. If that happens, ignore the error. We'll handle
1527 it below, when detach fails with ESRCH. */
1530 /* Flush any pending changes to the process's registers. */
1531 regcache_invalidate_thread (thread
);
1533 /* Finally, let it resume. */
1534 if (the_low_target
.prepare_to_resume
!= NULL
)
1535 the_low_target
.prepare_to_resume (lwp
);
1537 CATCH (ex
, RETURN_MASK_ERROR
)
1539 if (!check_ptrace_stopped_lwp_gone (lwp
))
1540 throw_exception (ex
);
1544 lwpid
= lwpid_of (thread
);
1545 if (ptrace (PTRACE_DETACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0,
1546 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1548 int save_errno
= errno
;
1550 /* We know the thread exists, so ESRCH must mean the lwp is
1551 zombie. This can happen if one of the already-detached
1552 threads exits the whole thread group. In that case we're
1553 still attached, and must reap the lwp. */
1554 if (save_errno
== ESRCH
)
1558 ret
= my_waitpid (lwpid
, &status
, __WALL
);
1561 warning (_("Couldn't reap LWP %d while detaching: %s"),
1562 lwpid
, strerror (errno
));
1564 else if (!WIFEXITED (status
) && !WIFSIGNALED (status
))
1566 warning (_("Reaping LWP %d while detaching "
1567 "returned unexpected status 0x%x"),
1573 error (_("Can't detach %s: %s"),
1574 target_pid_to_str (ptid_of (thread
)),
1575 strerror (save_errno
));
1578 else if (debug_threads
)
1580 debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n",
1581 target_pid_to_str (ptid_of (thread
)),
1588 /* Callback for for_each_thread. Detaches from non-leader threads of a
1592 linux_detach_lwp_callback (thread_info
*thread
)
1594 /* We don't actually detach from the thread group leader just yet.
1595 If the thread group exits, we must reap the zombie clone lwps
1596 before we're able to reap the leader. */
1597 if (thread
->id
.pid () == thread
->id
.lwp ())
1600 lwp_info
*lwp
= get_thread_lwp (thread
);
1601 linux_detach_one_lwp (lwp
);
1605 linux_detach (int pid
)
1607 struct process_info
*process
;
1608 struct lwp_info
*main_lwp
;
1610 process
= find_process_pid (pid
);
1611 if (process
== NULL
)
1614 /* As there's a step over already in progress, let it finish first,
1615 otherwise nesting a stabilize_threads operation on top gets real
1617 complete_ongoing_step_over ();
1619 /* Stop all threads before detaching. First, ptrace requires that
1620 the thread is stopped to sucessfully detach. Second, thread_db
1621 may need to uninstall thread event breakpoints from memory, which
1622 only works with a stopped process anyway. */
1623 stop_all_lwps (0, NULL
);
1625 #ifdef USE_THREAD_DB
1626 thread_db_detach (process
);
1629 /* Stabilize threads (move out of jump pads). */
1630 stabilize_threads ();
1632 /* Detach from the clone lwps first. If the thread group exits just
1633 while we're detaching, we must reap the clone lwps before we're
1634 able to reap the leader. */
1635 for_each_thread (pid
, linux_detach_lwp_callback
);
1637 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1638 linux_detach_one_lwp (main_lwp
);
1640 the_target
->mourn (process
);
1642 /* Since we presently can only stop all lwps of all processes, we
1643 need to unstop lwps of other processes. */
1644 unstop_all_lwps (0, NULL
);
1648 /* Remove all LWPs that belong to process PROC from the lwp list. */
1651 linux_mourn (struct process_info
*process
)
1653 struct process_info_private
*priv
;
1655 #ifdef USE_THREAD_DB
1656 thread_db_mourn (process
);
1659 for_each_thread (process
->pid
, [] (thread_info
*thread
)
1661 delete_lwp (get_thread_lwp (thread
));
1664 /* Freeing all private data. */
1665 priv
= process
->priv
;
1666 if (the_low_target
.delete_process
!= NULL
)
1667 the_low_target
.delete_process (priv
->arch_private
);
1669 gdb_assert (priv
->arch_private
== NULL
);
1671 process
->priv
= NULL
;
1673 remove_process (process
);
1677 linux_join (int pid
)
1682 ret
= my_waitpid (pid
, &status
, 0);
1683 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1685 } while (ret
!= -1 || errno
!= ECHILD
);
1688 /* Return nonzero if the given thread is still alive. */
1690 linux_thread_alive (ptid_t ptid
)
1692 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1694 /* We assume we always know if a thread exits. If a whole process
1695 exited but we still haven't been able to report it to GDB, we'll
1696 hold on to the last lwp of the dead process. */
1698 return !lwp_is_marked_dead (lwp
);
1703 /* Return 1 if this lwp still has an interesting status pending. If
1704 not (e.g., it had stopped for a breakpoint that is gone), return
1708 thread_still_has_status_pending_p (struct thread_info
*thread
)
1710 struct lwp_info
*lp
= get_thread_lwp (thread
);
1712 if (!lp
->status_pending_p
)
1715 if (thread
->last_resume_kind
!= resume_stop
1716 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1717 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1719 struct thread_info
*saved_thread
;
1723 gdb_assert (lp
->last_status
!= 0);
1727 saved_thread
= current_thread
;
1728 current_thread
= thread
;
1730 if (pc
!= lp
->stop_pc
)
1733 debug_printf ("PC of %ld changed\n",
1738 #if !USE_SIGTRAP_SIGINFO
1739 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1740 && !(*the_low_target
.breakpoint_at
) (pc
))
1743 debug_printf ("previous SW breakpoint of %ld gone\n",
1747 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1748 && !hardware_breakpoint_inserted_here (pc
))
1751 debug_printf ("previous HW breakpoint of %ld gone\n",
1757 current_thread
= saved_thread
;
1762 debug_printf ("discarding pending breakpoint status\n");
1763 lp
->status_pending_p
= 0;
1771 /* Returns true if LWP is resumed from the client's perspective. */
1774 lwp_resumed (struct lwp_info
*lwp
)
1776 struct thread_info
*thread
= get_lwp_thread (lwp
);
1778 if (thread
->last_resume_kind
!= resume_stop
)
1781 /* Did gdb send us a `vCont;t', but we haven't reported the
1782 corresponding stop to gdb yet? If so, the thread is still
1783 resumed/running from gdb's perspective. */
1784 if (thread
->last_resume_kind
== resume_stop
1785 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1791 /* Return true if this lwp has an interesting status pending. */
1793 status_pending_p_callback (thread_info
*thread
, ptid_t ptid
)
1795 struct lwp_info
*lp
= get_thread_lwp (thread
);
1797 /* Check if we're only interested in events from a specific process
1798 or a specific LWP. */
1799 if (!thread
->id
.matches (ptid
))
1802 if (!lwp_resumed (lp
))
1805 if (lp
->status_pending_p
1806 && !thread_still_has_status_pending_p (thread
))
1808 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1812 return lp
->status_pending_p
;
1816 find_lwp_pid (ptid_t ptid
)
1818 thread_info
*thread
= find_thread ([&] (thread_info
*thread
)
1820 int lwp
= ptid
.lwp () != 0 ? ptid
.lwp () : ptid
.pid ();
1821 return thread
->id
.lwp () == lwp
;
1827 return get_thread_lwp (thread
);
1830 /* Return the number of known LWPs in the tgid given by PID. */
1837 for_each_thread (pid
, [&] (thread_info
*thread
)
1845 /* See nat/linux-nat.h. */
1848 iterate_over_lwps (ptid_t filter
,
1849 iterate_over_lwps_ftype callback
,
1852 thread_info
*thread
= find_thread (filter
, [&] (thread_info
*thread
)
1854 lwp_info
*lwp
= get_thread_lwp (thread
);
1856 return callback (lwp
, data
);
1862 return get_thread_lwp (thread
);
1865 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1866 their exits until all other threads in the group have exited. */
1869 check_zombie_leaders (void)
1871 for_each_process ([] (process_info
*proc
) {
1872 pid_t leader_pid
= pid_of (proc
);
1873 struct lwp_info
*leader_lp
;
1875 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1878 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1879 "num_lwps=%d, zombie=%d\n",
1880 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1881 linux_proc_pid_is_zombie (leader_pid
));
1883 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1884 /* Check if there are other threads in the group, as we may
1885 have raced with the inferior simply exiting. */
1886 && !last_thread_of_process_p (leader_pid
)
1887 && linux_proc_pid_is_zombie (leader_pid
))
1889 /* A leader zombie can mean one of two things:
1891 - It exited, and there's an exit status pending
1892 available, or only the leader exited (not the whole
1893 program). In the latter case, we can't waitpid the
1894 leader's exit status until all other threads are gone.
1896 - There are 3 or more threads in the group, and a thread
1897 other than the leader exec'd. On an exec, the Linux
1898 kernel destroys all other threads (except the execing
1899 one) in the thread group, and resets the execing thread's
1900 tid to the tgid. No exit notification is sent for the
1901 execing thread -- from the ptracer's perspective, it
1902 appears as though the execing thread just vanishes.
1903 Until we reap all other threads except the leader and the
1904 execing thread, the leader will be zombie, and the
1905 execing thread will be in `D (disc sleep)'. As soon as
1906 all other threads are reaped, the execing thread changes
1907 it's tid to the tgid, and the previous (zombie) leader
1908 vanishes, giving place to the "new" leader. We could try
1909 distinguishing the exit and exec cases, by waiting once
1910 more, and seeing if something comes out, but it doesn't
1911 sound useful. The previous leader _does_ go away, and
1912 we'll re-add the new one once we see the exec event
1913 (which is just the same as what would happen if the
1914 previous leader did exit voluntarily before some other
1918 debug_printf ("CZL: Thread group leader %d zombie "
1919 "(it exited, or another thread execd).\n",
1922 delete_lwp (leader_lp
);
1927 /* Callback for `find_thread'. Returns the first LWP that is not
1931 not_stopped_callback (thread_info
*thread
, ptid_t filter
)
1933 if (!thread
->id
.matches (filter
))
1936 lwp_info
*lwp
= get_thread_lwp (thread
);
1938 return !lwp
->stopped
;
1941 /* Increment LWP's suspend count. */
1944 lwp_suspended_inc (struct lwp_info
*lwp
)
1948 if (debug_threads
&& lwp
->suspended
> 4)
1950 struct thread_info
*thread
= get_lwp_thread (lwp
);
1952 debug_printf ("LWP %ld has a suspiciously high suspend count,"
1953 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
1957 /* Decrement LWP's suspend count. */
1960 lwp_suspended_decr (struct lwp_info
*lwp
)
1964 if (lwp
->suspended
< 0)
1966 struct thread_info
*thread
= get_lwp_thread (lwp
);
1968 internal_error (__FILE__
, __LINE__
,
1969 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
1974 /* This function should only be called if the LWP got a SIGTRAP.
1976 Handle any tracepoint steps or hits. Return true if a tracepoint
1977 event was handled, 0 otherwise. */
1980 handle_tracepoints (struct lwp_info
*lwp
)
1982 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1983 int tpoint_related_event
= 0;
1985 gdb_assert (lwp
->suspended
== 0);
1987 /* If this tracepoint hit causes a tracing stop, we'll immediately
1988 uninsert tracepoints. To do this, we temporarily pause all
1989 threads, unpatch away, and then unpause threads. We need to make
1990 sure the unpausing doesn't resume LWP too. */
1991 lwp_suspended_inc (lwp
);
1993 /* And we need to be sure that any all-threads-stopping doesn't try
1994 to move threads out of the jump pads, as it could deadlock the
1995 inferior (LWP could be in the jump pad, maybe even holding the
1998 /* Do any necessary step collect actions. */
1999 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2001 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2003 /* See if we just hit a tracepoint and do its main collect
2005 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2007 lwp_suspended_decr (lwp
);
2009 gdb_assert (lwp
->suspended
== 0);
2010 gdb_assert (!stabilizing_threads
2011 || (lwp
->collecting_fast_tracepoint
2012 != fast_tpoint_collect_result::not_collecting
));
2014 if (tpoint_related_event
)
2017 debug_printf ("got a tracepoint event\n");
2024 /* Convenience wrapper. Returns information about LWP's fast tracepoint
2025 collection status. */
2027 static fast_tpoint_collect_result
2028 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2029 struct fast_tpoint_collect_status
*status
)
2031 CORE_ADDR thread_area
;
2032 struct thread_info
*thread
= get_lwp_thread (lwp
);
2034 if (the_low_target
.get_thread_area
== NULL
)
2035 return fast_tpoint_collect_result::not_collecting
;
2037 /* Get the thread area address. This is used to recognize which
2038 thread is which when tracing with the in-process agent library.
2039 We don't read anything from the address, and treat it as opaque;
2040 it's the address itself that we assume is unique per-thread. */
2041 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2042 return fast_tpoint_collect_result::not_collecting
;
2044 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2047 /* The reason we resume in the caller, is because we want to be able
2048 to pass lwp->status_pending as WSTAT, and we need to clear
2049 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2050 refuses to resume. */
2053 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2055 struct thread_info
*saved_thread
;
2057 saved_thread
= current_thread
;
2058 current_thread
= get_lwp_thread (lwp
);
2061 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2062 && supports_fast_tracepoints ()
2063 && agent_loaded_p ())
2065 struct fast_tpoint_collect_status status
;
2068 debug_printf ("Checking whether LWP %ld needs to move out of the "
2070 lwpid_of (current_thread
));
2072 fast_tpoint_collect_result r
2073 = linux_fast_tracepoint_collecting (lwp
, &status
);
2076 || (WSTOPSIG (*wstat
) != SIGILL
2077 && WSTOPSIG (*wstat
) != SIGFPE
2078 && WSTOPSIG (*wstat
) != SIGSEGV
2079 && WSTOPSIG (*wstat
) != SIGBUS
))
2081 lwp
->collecting_fast_tracepoint
= r
;
2083 if (r
!= fast_tpoint_collect_result::not_collecting
)
2085 if (r
== fast_tpoint_collect_result::before_insn
2086 && lwp
->exit_jump_pad_bkpt
== NULL
)
2088 /* Haven't executed the original instruction yet.
2089 Set breakpoint there, and wait till it's hit,
2090 then single-step until exiting the jump pad. */
2091 lwp
->exit_jump_pad_bkpt
2092 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2096 debug_printf ("Checking whether LWP %ld needs to move out of "
2097 "the jump pad...it does\n",
2098 lwpid_of (current_thread
));
2099 current_thread
= saved_thread
;
2106 /* If we get a synchronous signal while collecting, *and*
2107 while executing the (relocated) original instruction,
2108 reset the PC to point at the tpoint address, before
2109 reporting to GDB. Otherwise, it's an IPA lib bug: just
2110 report the signal to GDB, and pray for the best. */
2112 lwp
->collecting_fast_tracepoint
2113 = fast_tpoint_collect_result::not_collecting
;
2115 if (r
!= fast_tpoint_collect_result::not_collecting
2116 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2117 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2120 struct regcache
*regcache
;
2122 /* The si_addr on a few signals references the address
2123 of the faulting instruction. Adjust that as
2125 if ((WSTOPSIG (*wstat
) == SIGILL
2126 || WSTOPSIG (*wstat
) == SIGFPE
2127 || WSTOPSIG (*wstat
) == SIGBUS
2128 || WSTOPSIG (*wstat
) == SIGSEGV
)
2129 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2130 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2131 /* Final check just to make sure we don't clobber
2132 the siginfo of non-kernel-sent signals. */
2133 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2135 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2136 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2137 (PTRACE_TYPE_ARG3
) 0, &info
);
2140 regcache
= get_thread_regcache (current_thread
, 1);
2141 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2142 lwp
->stop_pc
= status
.tpoint_addr
;
2144 /* Cancel any fast tracepoint lock this thread was
2146 force_unlock_trace_buffer ();
2149 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2152 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2153 "stopping all threads momentarily.\n");
2155 stop_all_lwps (1, lwp
);
2157 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2158 lwp
->exit_jump_pad_bkpt
= NULL
;
2160 unstop_all_lwps (1, lwp
);
2162 gdb_assert (lwp
->suspended
>= 0);
2168 debug_printf ("Checking whether LWP %ld needs to move out of the "
2170 lwpid_of (current_thread
));
2172 current_thread
= saved_thread
;
2176 /* Enqueue one signal in the "signals to report later when out of the
2180 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2182 struct pending_signals
*p_sig
;
2183 struct thread_info
*thread
= get_lwp_thread (lwp
);
2186 debug_printf ("Deferring signal %d for LWP %ld.\n",
2187 WSTOPSIG (*wstat
), lwpid_of (thread
));
2191 struct pending_signals
*sig
;
2193 for (sig
= lwp
->pending_signals_to_report
;
2196 debug_printf (" Already queued %d\n",
2199 debug_printf (" (no more currently queued signals)\n");
2202 /* Don't enqueue non-RT signals if they are already in the deferred
2203 queue. (SIGSTOP being the easiest signal to see ending up here
2205 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2207 struct pending_signals
*sig
;
2209 for (sig
= lwp
->pending_signals_to_report
;
2213 if (sig
->signal
== WSTOPSIG (*wstat
))
2216 debug_printf ("Not requeuing already queued non-RT signal %d"
2225 p_sig
= XCNEW (struct pending_signals
);
2226 p_sig
->prev
= lwp
->pending_signals_to_report
;
2227 p_sig
->signal
= WSTOPSIG (*wstat
);
2229 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2232 lwp
->pending_signals_to_report
= p_sig
;
2235 /* Dequeue one signal from the "signals to report later when out of
2236 the jump pad" list. */
2239 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2241 struct thread_info
*thread
= get_lwp_thread (lwp
);
2243 if (lwp
->pending_signals_to_report
!= NULL
)
2245 struct pending_signals
**p_sig
;
2247 p_sig
= &lwp
->pending_signals_to_report
;
2248 while ((*p_sig
)->prev
!= NULL
)
2249 p_sig
= &(*p_sig
)->prev
;
2251 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2252 if ((*p_sig
)->info
.si_signo
!= 0)
2253 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2259 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2260 WSTOPSIG (*wstat
), lwpid_of (thread
));
2264 struct pending_signals
*sig
;
2266 for (sig
= lwp
->pending_signals_to_report
;
2269 debug_printf (" Still queued %d\n",
2272 debug_printf (" (no more queued signals)\n");
2281 /* Fetch the possibly triggered data watchpoint info and store it in
2284 On some archs, like x86, that use debug registers to set
2285 watchpoints, it's possible that the way to know which watched
2286 address trapped, is to check the register that is used to select
2287 which address to watch. Problem is, between setting the watchpoint
2288 and reading back which data address trapped, the user may change
2289 the set of watchpoints, and, as a consequence, GDB changes the
2290 debug registers in the inferior. To avoid reading back a stale
2291 stopped-data-address when that happens, we cache in LP the fact
2292 that a watchpoint trapped, and the corresponding data address, as
2293 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2294 registers meanwhile, we have the cached data we can rely on. */
2297 check_stopped_by_watchpoint (struct lwp_info
*child
)
2299 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2301 struct thread_info
*saved_thread
;
2303 saved_thread
= current_thread
;
2304 current_thread
= get_lwp_thread (child
);
2306 if (the_low_target
.stopped_by_watchpoint ())
2308 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2310 if (the_low_target
.stopped_data_address
!= NULL
)
2311 child
->stopped_data_address
2312 = the_low_target
.stopped_data_address ();
2314 child
->stopped_data_address
= 0;
2317 current_thread
= saved_thread
;
2320 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2323 /* Return the ptrace options that we want to try to enable. */
2326 linux_low_ptrace_options (int attached
)
2331 options
|= PTRACE_O_EXITKILL
;
2333 if (report_fork_events
)
2334 options
|= PTRACE_O_TRACEFORK
;
2336 if (report_vfork_events
)
2337 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2339 if (report_exec_events
)
2340 options
|= PTRACE_O_TRACEEXEC
;
2342 options
|= PTRACE_O_TRACESYSGOOD
;
2347 /* Do low-level handling of the event, and check if we should go on
2348 and pass it to caller code. Return the affected lwp if we are, or
2351 static struct lwp_info
*
2352 linux_low_filter_event (int lwpid
, int wstat
)
2354 struct lwp_info
*child
;
2355 struct thread_info
*thread
;
2356 int have_stop_pc
= 0;
2358 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2360 /* Check for stop events reported by a process we didn't already
2361 know about - anything not already in our LWP list.
2363 If we're expecting to receive stopped processes after
2364 fork, vfork, and clone events, then we'll just add the
2365 new one to our list and go back to waiting for the event
2366 to be reported - the stopped process might be returned
2367 from waitpid before or after the event is.
2369 But note the case of a non-leader thread exec'ing after the
2370 leader having exited, and gone from our lists (because
2371 check_zombie_leaders deleted it). The non-leader thread
2372 changes its tid to the tgid. */
2374 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2375 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2379 /* A multi-thread exec after we had seen the leader exiting. */
2382 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2383 "after exec.\n", lwpid
);
2386 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2387 child
= add_lwp (child_ptid
);
2389 current_thread
= child
->thread
;
2392 /* If we didn't find a process, one of two things presumably happened:
2393 - A process we started and then detached from has exited. Ignore it.
2394 - A process we are controlling has forked and the new child's stop
2395 was reported to us by the kernel. Save its PID. */
2396 if (child
== NULL
&& WIFSTOPPED (wstat
))
2398 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2401 else if (child
== NULL
)
2404 thread
= get_lwp_thread (child
);
2408 child
->last_status
= wstat
;
2410 /* Check if the thread has exited. */
2411 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2414 debug_printf ("LLFE: %d exited.\n", lwpid
);
2416 if (finish_step_over (child
))
2418 /* Unsuspend all other LWPs, and set them back running again. */
2419 unsuspend_all_lwps (child
);
2422 /* If there is at least one more LWP, then the exit signal was
2423 not the end of the debugged application and should be
2424 ignored, unless GDB wants to hear about thread exits. */
2425 if (report_thread_events
2426 || last_thread_of_process_p (pid_of (thread
)))
2428 /* Since events are serialized to GDB core, and we can't
2429 report this one right now. Leave the status pending for
2430 the next time we're able to report it. */
2431 mark_lwp_dead (child
, wstat
);
2441 gdb_assert (WIFSTOPPED (wstat
));
2443 if (WIFSTOPPED (wstat
))
2445 struct process_info
*proc
;
2447 /* Architecture-specific setup after inferior is running. */
2448 proc
= find_process_pid (pid_of (thread
));
2449 if (proc
->tdesc
== NULL
)
2453 /* This needs to happen after we have attached to the
2454 inferior and it is stopped for the first time, but
2455 before we access any inferior registers. */
2456 linux_arch_setup_thread (thread
);
2460 /* The process is started, but GDBserver will do
2461 architecture-specific setup after the program stops at
2462 the first instruction. */
2463 child
->status_pending_p
= 1;
2464 child
->status_pending
= wstat
;
2470 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2472 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2473 int options
= linux_low_ptrace_options (proc
->attached
);
2475 linux_enable_event_reporting (lwpid
, options
);
2476 child
->must_set_ptrace_flags
= 0;
2479 /* Always update syscall_state, even if it will be filtered later. */
2480 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2482 child
->syscall_state
2483 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2484 ? TARGET_WAITKIND_SYSCALL_RETURN
2485 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2489 /* Almost all other ptrace-stops are known to be outside of system
2490 calls, with further exceptions in handle_extended_wait. */
2491 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2494 /* Be careful to not overwrite stop_pc until save_stop_reason is
2496 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2497 && linux_is_extended_waitstatus (wstat
))
2499 child
->stop_pc
= get_pc (child
);
2500 if (handle_extended_wait (&child
, wstat
))
2502 /* The event has been handled, so just return without
2508 if (linux_wstatus_maybe_breakpoint (wstat
))
2510 if (save_stop_reason (child
))
2515 child
->stop_pc
= get_pc (child
);
2517 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2518 && child
->stop_expected
)
2521 debug_printf ("Expected stop.\n");
2522 child
->stop_expected
= 0;
2524 if (thread
->last_resume_kind
== resume_stop
)
2526 /* We want to report the stop to the core. Treat the
2527 SIGSTOP as a normal event. */
2529 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2530 target_pid_to_str (ptid_of (thread
)));
2532 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2534 /* Stopping threads. We don't want this SIGSTOP to end up
2537 debug_printf ("LLW: SIGSTOP caught for %s "
2538 "while stopping threads.\n",
2539 target_pid_to_str (ptid_of (thread
)));
2544 /* This is a delayed SIGSTOP. Filter out the event. */
2546 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2547 child
->stepping
? "step" : "continue",
2548 target_pid_to_str (ptid_of (thread
)));
2550 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2555 child
->status_pending_p
= 1;
2556 child
->status_pending
= wstat
;
2560 /* Return true if THREAD is doing hardware single step. */
2563 maybe_hw_step (struct thread_info
*thread
)
2565 if (can_hardware_single_step ())
2569 /* GDBserver must insert single-step breakpoint for software
2571 gdb_assert (has_single_step_breakpoints (thread
));
2576 /* Resume LWPs that are currently stopped without any pending status
2577 to report, but are resumed from the core's perspective. */
2580 resume_stopped_resumed_lwps (thread_info
*thread
)
2582 struct lwp_info
*lp
= get_thread_lwp (thread
);
2586 && !lp
->status_pending_p
2587 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2591 if (thread
->last_resume_kind
== resume_step
)
2592 step
= maybe_hw_step (thread
);
2595 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2596 target_pid_to_str (ptid_of (thread
)),
2597 paddress (lp
->stop_pc
),
2600 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2604 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2605 match FILTER_PTID (leaving others pending). The PTIDs can be:
2606 minus_one_ptid, to specify any child; a pid PTID, specifying all
2607 lwps of a thread group; or a PTID representing a single lwp. Store
2608 the stop status through the status pointer WSTAT. OPTIONS is
2609 passed to the waitpid call. Return 0 if no event was found and
2610 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2611 was found. Return the PID of the stopped child otherwise. */
2614 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2615 int *wstatp
, int options
)
2617 struct thread_info
*event_thread
;
2618 struct lwp_info
*event_child
, *requested_child
;
2619 sigset_t block_mask
, prev_mask
;
2622 /* N.B. event_thread points to the thread_info struct that contains
2623 event_child. Keep them in sync. */
2624 event_thread
= NULL
;
2626 requested_child
= NULL
;
2628 /* Check for a lwp with a pending status. */
2630 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2632 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2634 return status_pending_p_callback (thread
, filter_ptid
);
2637 if (event_thread
!= NULL
)
2638 event_child
= get_thread_lwp (event_thread
);
2639 if (debug_threads
&& event_thread
)
2640 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2642 else if (!ptid_equal (filter_ptid
, null_ptid
))
2644 requested_child
= find_lwp_pid (filter_ptid
);
2646 if (stopping_threads
== NOT_STOPPING_THREADS
2647 && requested_child
->status_pending_p
2648 && (requested_child
->collecting_fast_tracepoint
2649 != fast_tpoint_collect_result::not_collecting
))
2651 enqueue_one_deferred_signal (requested_child
,
2652 &requested_child
->status_pending
);
2653 requested_child
->status_pending_p
= 0;
2654 requested_child
->status_pending
= 0;
2655 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2658 if (requested_child
->suspended
2659 && requested_child
->status_pending_p
)
2661 internal_error (__FILE__
, __LINE__
,
2662 "requesting an event out of a"
2663 " suspended child?");
2666 if (requested_child
->status_pending_p
)
2668 event_child
= requested_child
;
2669 event_thread
= get_lwp_thread (event_child
);
2673 if (event_child
!= NULL
)
2676 debug_printf ("Got an event from pending child %ld (%04x)\n",
2677 lwpid_of (event_thread
), event_child
->status_pending
);
2678 *wstatp
= event_child
->status_pending
;
2679 event_child
->status_pending_p
= 0;
2680 event_child
->status_pending
= 0;
2681 current_thread
= event_thread
;
2682 return lwpid_of (event_thread
);
2685 /* But if we don't find a pending event, we'll have to wait.
2687 We only enter this loop if no process has a pending wait status.
2688 Thus any action taken in response to a wait status inside this
2689 loop is responding as soon as we detect the status, not after any
2692 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2693 all signals while here. */
2694 sigfillset (&block_mask
);
2695 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2697 /* Always pull all events out of the kernel. We'll randomly select
2698 an event LWP out of all that have events, to prevent
2700 while (event_child
== NULL
)
2704 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2707 - If the thread group leader exits while other threads in the
2708 thread group still exist, waitpid(TGID, ...) hangs. That
2709 waitpid won't return an exit status until the other threads
2710 in the group are reaped.
2712 - When a non-leader thread execs, that thread just vanishes
2713 without reporting an exit (so we'd hang if we waited for it
2714 explicitly in that case). The exec event is reported to
2717 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2720 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2721 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2727 debug_printf ("LLW: waitpid %ld received %s\n",
2728 (long) ret
, status_to_str (*wstatp
));
2731 /* Filter all events. IOW, leave all events pending. We'll
2732 randomly select an event LWP out of all that have events
2734 linux_low_filter_event (ret
, *wstatp
);
2735 /* Retry until nothing comes out of waitpid. A single
2736 SIGCHLD can indicate more than one child stopped. */
2740 /* Now that we've pulled all events out of the kernel, resume
2741 LWPs that don't have an interesting event to report. */
2742 if (stopping_threads
== NOT_STOPPING_THREADS
)
2743 for_each_thread (resume_stopped_resumed_lwps
);
2745 /* ... and find an LWP with a status to report to the core, if
2747 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2749 return status_pending_p_callback (thread
, filter_ptid
);
2752 if (event_thread
!= NULL
)
2754 event_child
= get_thread_lwp (event_thread
);
2755 *wstatp
= event_child
->status_pending
;
2756 event_child
->status_pending_p
= 0;
2757 event_child
->status_pending
= 0;
2761 /* Check for zombie thread group leaders. Those can't be reaped
2762 until all other threads in the thread group are. */
2763 check_zombie_leaders ();
2765 auto not_stopped
= [&] (thread_info
*thread
)
2767 return not_stopped_callback (thread
, wait_ptid
);
2770 /* If there are no resumed children left in the set of LWPs we
2771 want to wait for, bail. We can't just block in
2772 waitpid/sigsuspend, because lwps might have been left stopped
2773 in trace-stop state, and we'd be stuck forever waiting for
2774 their status to change (which would only happen if we resumed
2775 them). Even if WNOHANG is set, this return code is preferred
2776 over 0 (below), as it is more detailed. */
2777 if (find_thread (not_stopped
) == NULL
)
2780 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2781 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2785 /* No interesting event to report to the caller. */
2786 if ((options
& WNOHANG
))
2789 debug_printf ("WNOHANG set, no event found\n");
2791 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2795 /* Block until we get an event reported with SIGCHLD. */
2797 debug_printf ("sigsuspend'ing\n");
2799 sigsuspend (&prev_mask
);
2800 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2804 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2806 current_thread
= event_thread
;
2808 return lwpid_of (event_thread
);
2811 /* Wait for an event from child(ren) PTID. PTIDs can be:
2812 minus_one_ptid, to specify any child; a pid PTID, specifying all
2813 lwps of a thread group; or a PTID representing a single lwp. Store
2814 the stop status through the status pointer WSTAT. OPTIONS is
2815 passed to the waitpid call. Return 0 if no event was found and
2816 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2817 was found. Return the PID of the stopped child otherwise. */
2820 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2822 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2825 /* Select one LWP out of those that have events pending. */
2828 select_event_lwp (struct lwp_info
**orig_lp
)
2830 int random_selector
;
2831 struct thread_info
*event_thread
= NULL
;
2833 /* In all-stop, give preference to the LWP that is being
2834 single-stepped. There will be at most one, and it's the LWP that
2835 the core is most interested in. If we didn't do this, then we'd
2836 have to handle pending step SIGTRAPs somehow in case the core
2837 later continues the previously-stepped thread, otherwise we'd
2838 report the pending SIGTRAP, and the core, not having stepped the
2839 thread, wouldn't understand what the trap was for, and therefore
2840 would report it to the user as a random signal. */
2843 event_thread
= find_thread ([] (thread_info
*thread
)
2845 lwp_info
*lp
= get_thread_lwp (thread
);
2847 return (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2848 && thread
->last_resume_kind
== resume_step
2849 && lp
->status_pending_p
);
2852 if (event_thread
!= NULL
)
2855 debug_printf ("SEL: Select single-step %s\n",
2856 target_pid_to_str (ptid_of (event_thread
)));
2859 if (event_thread
== NULL
)
2861 /* No single-stepping LWP. Select one at random, out of those
2862 which have had events. */
2864 /* First see how many events we have. */
2866 for_each_thread ([&] (thread_info
*thread
)
2868 lwp_info
*lp
= get_thread_lwp (thread
);
2870 /* Count only resumed LWPs that have an event pending. */
2871 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2872 && lp
->status_pending_p
)
2875 gdb_assert (num_events
> 0);
2877 /* Now randomly pick a LWP out of those that have had
2879 random_selector
= (int)
2880 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2882 if (debug_threads
&& num_events
> 1)
2883 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2884 num_events
, random_selector
);
2886 event_thread
= find_thread ([&] (thread_info
*thread
)
2888 lwp_info
*lp
= get_thread_lwp (thread
);
2890 /* Select only resumed LWPs that have an event pending. */
2891 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2892 && lp
->status_pending_p
)
2893 if (random_selector
-- == 0)
2900 if (event_thread
!= NULL
)
2902 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2904 /* Switch the event LWP. */
2905 *orig_lp
= event_lp
;
2909 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2913 unsuspend_all_lwps (struct lwp_info
*except
)
2915 for_each_thread ([&] (thread_info
*thread
)
2917 lwp_info
*lwp
= get_thread_lwp (thread
);
2920 lwp_suspended_decr (lwp
);
2924 static void move_out_of_jump_pad_callback (thread_info
*thread
);
2925 static bool stuck_in_jump_pad_callback (thread_info
*thread
);
2926 static bool lwp_running (thread_info
*thread
);
2927 static ptid_t
linux_wait_1 (ptid_t ptid
,
2928 struct target_waitstatus
*ourstatus
,
2929 int target_options
);
2931 /* Stabilize threads (move out of jump pads).
2933 If a thread is midway collecting a fast tracepoint, we need to
2934 finish the collection and move it out of the jump pad before
2935 reporting the signal.
2937 This avoids recursion while collecting (when a signal arrives
2938 midway, and the signal handler itself collects), which would trash
2939 the trace buffer. In case the user set a breakpoint in a signal
2940 handler, this avoids the backtrace showing the jump pad, etc..
2941 Most importantly, there are certain things we can't do safely if
2942 threads are stopped in a jump pad (or in its callee's). For
2945 - starting a new trace run. A thread still collecting the
2946 previous run, could trash the trace buffer when resumed. The trace
2947 buffer control structures would have been reset but the thread had
2948 no way to tell. The thread could even midway memcpy'ing to the
2949 buffer, which would mean that when resumed, it would clobber the
2950 trace buffer that had been set for a new run.
2952 - we can't rewrite/reuse the jump pads for new tracepoints
2953 safely. Say you do tstart while a thread is stopped midway while
2954 collecting. When the thread is later resumed, it finishes the
2955 collection, and returns to the jump pad, to execute the original
2956 instruction that was under the tracepoint jump at the time the
2957 older run had been started. If the jump pad had been rewritten
2958 since for something else in the new run, the thread would now
2959 execute the wrong / random instructions. */
2962 linux_stabilize_threads (void)
2964 thread_info
*thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
2966 if (thread_stuck
!= NULL
)
2969 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2970 lwpid_of (thread_stuck
));
2974 thread_info
*saved_thread
= current_thread
;
2976 stabilizing_threads
= 1;
2979 for_each_thread (move_out_of_jump_pad_callback
);
2981 /* Loop until all are stopped out of the jump pads. */
2982 while (find_thread (lwp_running
) != NULL
)
2984 struct target_waitstatus ourstatus
;
2985 struct lwp_info
*lwp
;
2988 /* Note that we go through the full wait even loop. While
2989 moving threads out of jump pad, we need to be able to step
2990 over internal breakpoints and such. */
2991 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2993 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2995 lwp
= get_thread_lwp (current_thread
);
2998 lwp_suspended_inc (lwp
);
3000 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3001 || current_thread
->last_resume_kind
== resume_stop
)
3003 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3004 enqueue_one_deferred_signal (lwp
, &wstat
);
3009 unsuspend_all_lwps (NULL
);
3011 stabilizing_threads
= 0;
3013 current_thread
= saved_thread
;
3017 thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
3019 if (thread_stuck
!= NULL
)
3020 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3021 lwpid_of (thread_stuck
));
3025 /* Convenience function that is called when the kernel reports an
3026 event that is not passed out to GDB. */
3029 ignore_event (struct target_waitstatus
*ourstatus
)
3031 /* If we got an event, there may still be others, as a single
3032 SIGCHLD can indicate more than one child stopped. This forces
3033 another target_wait call. */
3036 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3040 /* Convenience function that is called when the kernel reports an exit
3041 event. This decides whether to report the event to GDB as a
3042 process exit event, a thread exit event, or to suppress the
3046 filter_exit_event (struct lwp_info
*event_child
,
3047 struct target_waitstatus
*ourstatus
)
3049 struct thread_info
*thread
= get_lwp_thread (event_child
);
3050 ptid_t ptid
= ptid_of (thread
);
3052 if (!last_thread_of_process_p (pid_of (thread
)))
3054 if (report_thread_events
)
3055 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3057 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3059 delete_lwp (event_child
);
3064 /* Returns 1 if GDB is interested in any event_child syscalls. */
3067 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3069 struct thread_info
*thread
= get_lwp_thread (event_child
);
3070 struct process_info
*proc
= get_thread_process (thread
);
3072 return !proc
->syscalls_to_catch
.empty ();
3075 /* Returns 1 if GDB is interested in the event_child syscall.
3076 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3079 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3082 struct thread_info
*thread
= get_lwp_thread (event_child
);
3083 struct process_info
*proc
= get_thread_process (thread
);
3085 if (proc
->syscalls_to_catch
.empty ())
3088 if (proc
->syscalls_to_catch
[0] == ANY_SYSCALL
)
3091 get_syscall_trapinfo (event_child
, &sysno
);
3093 for (int iter
: proc
->syscalls_to_catch
)
3100 /* Wait for process, returns status. */
3103 linux_wait_1 (ptid_t ptid
,
3104 struct target_waitstatus
*ourstatus
, int target_options
)
3107 struct lwp_info
*event_child
;
3110 int step_over_finished
;
3111 int bp_explains_trap
;
3112 int maybe_internal_trap
;
3121 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3124 /* Translate generic target options into linux options. */
3126 if (target_options
& TARGET_WNOHANG
)
3129 bp_explains_trap
= 0;
3132 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3134 auto status_pending_p_any
= [&] (thread_info
*thread
)
3136 return status_pending_p_callback (thread
, minus_one_ptid
);
3139 auto not_stopped
= [&] (thread_info
*thread
)
3141 return not_stopped_callback (thread
, minus_one_ptid
);
3144 /* Find a resumed LWP, if any. */
3145 if (find_thread (status_pending_p_any
) != NULL
)
3147 else if (find_thread (not_stopped
) != NULL
)
3152 if (ptid_equal (step_over_bkpt
, null_ptid
))
3153 pid
= linux_wait_for_event (ptid
, &w
, options
);
3157 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3158 target_pid_to_str (step_over_bkpt
));
3159 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3162 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3164 gdb_assert (target_options
& TARGET_WNOHANG
);
3168 debug_printf ("linux_wait_1 ret = null_ptid, "
3169 "TARGET_WAITKIND_IGNORE\n");
3173 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3180 debug_printf ("linux_wait_1 ret = null_ptid, "
3181 "TARGET_WAITKIND_NO_RESUMED\n");
3185 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3189 event_child
= get_thread_lwp (current_thread
);
3191 /* linux_wait_for_event only returns an exit status for the last
3192 child of a process. Report it. */
3193 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3197 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3198 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3202 debug_printf ("linux_wait_1 ret = %s, exited with "
3204 target_pid_to_str (ptid_of (current_thread
)),
3211 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3212 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3216 debug_printf ("linux_wait_1 ret = %s, terminated with "
3218 target_pid_to_str (ptid_of (current_thread
)),
3224 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3225 return filter_exit_event (event_child
, ourstatus
);
3227 return ptid_of (current_thread
);
3230 /* If step-over executes a breakpoint instruction, in the case of a
3231 hardware single step it means a gdb/gdbserver breakpoint had been
3232 planted on top of a permanent breakpoint, in the case of a software
3233 single step it may just mean that gdbserver hit the reinsert breakpoint.
3234 The PC has been adjusted by save_stop_reason to point at
3235 the breakpoint address.
3236 So in the case of the hardware single step advance the PC manually
3237 past the breakpoint and in the case of software single step advance only
3238 if it's not the single_step_breakpoint we are hitting.
3239 This avoids that a program would keep trapping a permanent breakpoint
3241 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3242 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3243 && (event_child
->stepping
3244 || !single_step_breakpoint_inserted_here (event_child
->stop_pc
)))
3246 int increment_pc
= 0;
3247 int breakpoint_kind
= 0;
3248 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3251 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3252 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3256 debug_printf ("step-over for %s executed software breakpoint\n",
3257 target_pid_to_str (ptid_of (current_thread
)));
3260 if (increment_pc
!= 0)
3262 struct regcache
*regcache
3263 = get_thread_regcache (current_thread
, 1);
3265 event_child
->stop_pc
+= increment_pc
;
3266 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3268 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3269 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3273 /* If this event was not handled before, and is not a SIGTRAP, we
3274 report it. SIGILL and SIGSEGV are also treated as traps in case
3275 a breakpoint is inserted at the current PC. If this target does
3276 not support internal breakpoints at all, we also report the
3277 SIGTRAP without further processing; it's of no concern to us. */
3279 = (supports_breakpoints ()
3280 && (WSTOPSIG (w
) == SIGTRAP
3281 || ((WSTOPSIG (w
) == SIGILL
3282 || WSTOPSIG (w
) == SIGSEGV
)
3283 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3285 if (maybe_internal_trap
)
3287 /* Handle anything that requires bookkeeping before deciding to
3288 report the event or continue waiting. */
3290 /* First check if we can explain the SIGTRAP with an internal
3291 breakpoint, or if we should possibly report the event to GDB.
3292 Do this before anything that may remove or insert a
3294 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3296 /* We have a SIGTRAP, possibly a step-over dance has just
3297 finished. If so, tweak the state machine accordingly,
3298 reinsert breakpoints and delete any single-step
3300 step_over_finished
= finish_step_over (event_child
);
3302 /* Now invoke the callbacks of any internal breakpoints there. */
3303 check_breakpoints (event_child
->stop_pc
);
3305 /* Handle tracepoint data collecting. This may overflow the
3306 trace buffer, and cause a tracing stop, removing
3308 trace_event
= handle_tracepoints (event_child
);
3310 if (bp_explains_trap
)
3313 debug_printf ("Hit a gdbserver breakpoint.\n");
3318 /* We have some other signal, possibly a step-over dance was in
3319 progress, and it should be cancelled too. */
3320 step_over_finished
= finish_step_over (event_child
);
3323 /* We have all the data we need. Either report the event to GDB, or
3324 resume threads and keep waiting for more. */
3326 /* If we're collecting a fast tracepoint, finish the collection and
3327 move out of the jump pad before delivering a signal. See
3328 linux_stabilize_threads. */
3331 && WSTOPSIG (w
) != SIGTRAP
3332 && supports_fast_tracepoints ()
3333 && agent_loaded_p ())
3336 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3337 "to defer or adjust it.\n",
3338 WSTOPSIG (w
), lwpid_of (current_thread
));
3340 /* Allow debugging the jump pad itself. */
3341 if (current_thread
->last_resume_kind
!= resume_step
3342 && maybe_move_out_of_jump_pad (event_child
, &w
))
3344 enqueue_one_deferred_signal (event_child
, &w
);
3347 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3348 WSTOPSIG (w
), lwpid_of (current_thread
));
3350 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3354 return ignore_event (ourstatus
);
3358 if (event_child
->collecting_fast_tracepoint
3359 != fast_tpoint_collect_result::not_collecting
)
3362 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3363 "Check if we're already there.\n",
3364 lwpid_of (current_thread
),
3365 (int) event_child
->collecting_fast_tracepoint
);
3369 event_child
->collecting_fast_tracepoint
3370 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3372 if (event_child
->collecting_fast_tracepoint
3373 != fast_tpoint_collect_result::before_insn
)
3375 /* No longer need this breakpoint. */
3376 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3379 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3380 "stopping all threads momentarily.\n");
3382 /* Other running threads could hit this breakpoint.
3383 We don't handle moribund locations like GDB does,
3384 instead we always pause all threads when removing
3385 breakpoints, so that any step-over or
3386 decr_pc_after_break adjustment is always taken
3387 care of while the breakpoint is still
3389 stop_all_lwps (1, event_child
);
3391 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3392 event_child
->exit_jump_pad_bkpt
= NULL
;
3394 unstop_all_lwps (1, event_child
);
3396 gdb_assert (event_child
->suspended
>= 0);
3400 if (event_child
->collecting_fast_tracepoint
3401 == fast_tpoint_collect_result::not_collecting
)
3404 debug_printf ("fast tracepoint finished "
3405 "collecting successfully.\n");
3407 /* We may have a deferred signal to report. */
3408 if (dequeue_one_deferred_signal (event_child
, &w
))
3411 debug_printf ("dequeued one signal.\n");
3416 debug_printf ("no deferred signals.\n");
3418 if (stabilizing_threads
)
3420 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3421 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3425 debug_printf ("linux_wait_1 ret = %s, stopped "
3426 "while stabilizing threads\n",
3427 target_pid_to_str (ptid_of (current_thread
)));
3431 return ptid_of (current_thread
);
3437 /* Check whether GDB would be interested in this event. */
3439 /* Check if GDB is interested in this syscall. */
3441 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3442 && !gdb_catch_this_syscall_p (event_child
))
3446 debug_printf ("Ignored syscall for LWP %ld.\n",
3447 lwpid_of (current_thread
));
3450 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3455 return ignore_event (ourstatus
);
3458 /* If GDB is not interested in this signal, don't stop other
3459 threads, and don't report it to GDB. Just resume the inferior
3460 right away. We do this for threading-related signals as well as
3461 any that GDB specifically requested we ignore. But never ignore
3462 SIGSTOP if we sent it ourselves, and do not ignore signals when
3463 stepping - they may require special handling to skip the signal
3464 handler. Also never ignore signals that could be caused by a
3467 && current_thread
->last_resume_kind
!= resume_step
3469 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3470 (current_process ()->priv
->thread_db
!= NULL
3471 && (WSTOPSIG (w
) == __SIGRTMIN
3472 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3475 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3476 && !(WSTOPSIG (w
) == SIGSTOP
3477 && current_thread
->last_resume_kind
== resume_stop
)
3478 && !linux_wstatus_maybe_breakpoint (w
))))
3480 siginfo_t info
, *info_p
;
3483 debug_printf ("Ignored signal %d for LWP %ld.\n",
3484 WSTOPSIG (w
), lwpid_of (current_thread
));
3486 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3487 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3492 if (step_over_finished
)
3494 /* We cancelled this thread's step-over above. We still
3495 need to unsuspend all other LWPs, and set them back
3496 running again while the signal handler runs. */
3497 unsuspend_all_lwps (event_child
);
3499 /* Enqueue the pending signal info so that proceed_all_lwps
3501 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3503 proceed_all_lwps ();
3507 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3508 WSTOPSIG (w
), info_p
);
3514 return ignore_event (ourstatus
);
3517 /* Note that all addresses are always "out of the step range" when
3518 there's no range to begin with. */
3519 in_step_range
= lwp_in_step_range (event_child
);
3521 /* If GDB wanted this thread to single step, and the thread is out
3522 of the step range, we always want to report the SIGTRAP, and let
3523 GDB handle it. Watchpoints should always be reported. So should
3524 signals we can't explain. A SIGTRAP we can't explain could be a
3525 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3526 do, we're be able to handle GDB breakpoints on top of internal
3527 breakpoints, by handling the internal breakpoint and still
3528 reporting the event to GDB. If we don't, we're out of luck, GDB
3529 won't see the breakpoint hit. If we see a single-step event but
3530 the thread should be continuing, don't pass the trap to gdb.
3531 That indicates that we had previously finished a single-step but
3532 left the single-step pending -- see
3533 complete_ongoing_step_over. */
3534 report_to_gdb
= (!maybe_internal_trap
3535 || (current_thread
->last_resume_kind
== resume_step
3537 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3539 && !bp_explains_trap
3541 && !step_over_finished
3542 && !(current_thread
->last_resume_kind
== resume_continue
3543 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3544 || (gdb_breakpoint_here (event_child
->stop_pc
)
3545 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3546 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3547 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3549 run_breakpoint_commands (event_child
->stop_pc
);
3551 /* We found no reason GDB would want us to stop. We either hit one
3552 of our own breakpoints, or finished an internal step GDB
3553 shouldn't know about. */
3558 if (bp_explains_trap
)
3559 debug_printf ("Hit a gdbserver breakpoint.\n");
3560 if (step_over_finished
)
3561 debug_printf ("Step-over finished.\n");
3563 debug_printf ("Tracepoint event.\n");
3564 if (lwp_in_step_range (event_child
))
3565 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3566 paddress (event_child
->stop_pc
),
3567 paddress (event_child
->step_range_start
),
3568 paddress (event_child
->step_range_end
));
3571 /* We're not reporting this breakpoint to GDB, so apply the
3572 decr_pc_after_break adjustment to the inferior's regcache
3575 if (the_low_target
.set_pc
!= NULL
)
3577 struct regcache
*regcache
3578 = get_thread_regcache (current_thread
, 1);
3579 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3582 if (step_over_finished
)
3584 /* If we have finished stepping over a breakpoint, we've
3585 stopped and suspended all LWPs momentarily except the
3586 stepping one. This is where we resume them all again.
3587 We're going to keep waiting, so use proceed, which
3588 handles stepping over the next breakpoint. */
3589 unsuspend_all_lwps (event_child
);
3593 /* Remove the single-step breakpoints if any. Note that
3594 there isn't single-step breakpoint if we finished stepping
3596 if (can_software_single_step ()
3597 && has_single_step_breakpoints (current_thread
))
3599 stop_all_lwps (0, event_child
);
3600 delete_single_step_breakpoints (current_thread
);
3601 unstop_all_lwps (0, event_child
);
3606 debug_printf ("proceeding all threads.\n");
3607 proceed_all_lwps ();
3612 return ignore_event (ourstatus
);
3617 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3620 = target_waitstatus_to_string (&event_child
->waitstatus
);
3622 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3623 lwpid_of (get_lwp_thread (event_child
)), str
.c_str ());
3625 if (current_thread
->last_resume_kind
== resume_step
)
3627 if (event_child
->step_range_start
== event_child
->step_range_end
)
3628 debug_printf ("GDB wanted to single-step, reporting event.\n");
3629 else if (!lwp_in_step_range (event_child
))
3630 debug_printf ("Out of step range, reporting event.\n");
3632 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3633 debug_printf ("Stopped by watchpoint.\n");
3634 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3635 debug_printf ("Stopped by GDB breakpoint.\n");
3637 debug_printf ("Hit a non-gdbserver trap event.\n");
3640 /* Alright, we're going to report a stop. */
3642 /* Remove single-step breakpoints. */
3643 if (can_software_single_step ())
3645 /* Remove single-step breakpoints or not. It it is true, stop all
3646 lwps, so that other threads won't hit the breakpoint in the
3648 int remove_single_step_breakpoints_p
= 0;
3652 remove_single_step_breakpoints_p
3653 = has_single_step_breakpoints (current_thread
);
3657 /* In all-stop, a stop reply cancels all previous resume
3658 requests. Delete all single-step breakpoints. */
3660 find_thread ([&] (thread_info
*thread
) {
3661 if (has_single_step_breakpoints (thread
))
3663 remove_single_step_breakpoints_p
= 1;
3671 if (remove_single_step_breakpoints_p
)
3673 /* If we remove single-step breakpoints from memory, stop all lwps,
3674 so that other threads won't hit the breakpoint in the staled
3676 stop_all_lwps (0, event_child
);
3680 gdb_assert (has_single_step_breakpoints (current_thread
));
3681 delete_single_step_breakpoints (current_thread
);
3685 for_each_thread ([] (thread_info
*thread
){
3686 if (has_single_step_breakpoints (thread
))
3687 delete_single_step_breakpoints (thread
);
3691 unstop_all_lwps (0, event_child
);
3695 if (!stabilizing_threads
)
3697 /* In all-stop, stop all threads. */
3699 stop_all_lwps (0, NULL
);
3701 if (step_over_finished
)
3705 /* If we were doing a step-over, all other threads but
3706 the stepping one had been paused in start_step_over,
3707 with their suspend counts incremented. We don't want
3708 to do a full unstop/unpause, because we're in
3709 all-stop mode (so we want threads stopped), but we
3710 still need to unsuspend the other threads, to
3711 decrement their `suspended' count back. */
3712 unsuspend_all_lwps (event_child
);
3716 /* If we just finished a step-over, then all threads had
3717 been momentarily paused. In all-stop, that's fine,
3718 we want threads stopped by now anyway. In non-stop,
3719 we need to re-resume threads that GDB wanted to be
3721 unstop_all_lwps (1, event_child
);
3725 /* If we're not waiting for a specific LWP, choose an event LWP
3726 from among those that have had events. Giving equal priority
3727 to all LWPs that have had events helps prevent
3729 if (ptid_equal (ptid
, minus_one_ptid
))
3731 event_child
->status_pending_p
= 1;
3732 event_child
->status_pending
= w
;
3734 select_event_lwp (&event_child
);
3736 /* current_thread and event_child must stay in sync. */
3737 current_thread
= get_lwp_thread (event_child
);
3739 event_child
->status_pending_p
= 0;
3740 w
= event_child
->status_pending
;
3744 /* Stabilize threads (move out of jump pads). */
3746 stabilize_threads ();
3750 /* If we just finished a step-over, then all threads had been
3751 momentarily paused. In all-stop, that's fine, we want
3752 threads stopped by now anyway. In non-stop, we need to
3753 re-resume threads that GDB wanted to be running. */
3754 if (step_over_finished
)
3755 unstop_all_lwps (1, event_child
);
3758 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3760 /* If the reported event is an exit, fork, vfork or exec, let
3763 /* Break the unreported fork relationship chain. */
3764 if (event_child
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
3765 || event_child
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
)
3767 event_child
->fork_relative
->fork_relative
= NULL
;
3768 event_child
->fork_relative
= NULL
;
3771 *ourstatus
= event_child
->waitstatus
;
3772 /* Clear the event lwp's waitstatus since we handled it already. */
3773 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3776 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3778 /* Now that we've selected our final event LWP, un-adjust its PC if
3779 it was a software breakpoint, and the client doesn't know we can
3780 adjust the breakpoint ourselves. */
3781 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3782 && !swbreak_feature
)
3784 int decr_pc
= the_low_target
.decr_pc_after_break
;
3788 struct regcache
*regcache
3789 = get_thread_regcache (current_thread
, 1);
3790 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3794 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3796 get_syscall_trapinfo (event_child
,
3797 &ourstatus
->value
.syscall_number
);
3798 ourstatus
->kind
= event_child
->syscall_state
;
3800 else if (current_thread
->last_resume_kind
== resume_stop
3801 && WSTOPSIG (w
) == SIGSTOP
)
3803 /* A thread that has been requested to stop by GDB with vCont;t,
3804 and it stopped cleanly, so report as SIG0. The use of
3805 SIGSTOP is an implementation detail. */
3806 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3808 else if (current_thread
->last_resume_kind
== resume_stop
3809 && WSTOPSIG (w
) != SIGSTOP
)
3811 /* A thread that has been requested to stop by GDB with vCont;t,
3812 but, it stopped for other reasons. */
3813 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3815 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3817 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3820 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3824 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3825 target_pid_to_str (ptid_of (current_thread
)),
3826 ourstatus
->kind
, ourstatus
->value
.sig
);
3830 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3831 return filter_exit_event (event_child
, ourstatus
);
3833 return ptid_of (current_thread
);
3836 /* Get rid of any pending event in the pipe. */
3838 async_file_flush (void)
3844 ret
= read (linux_event_pipe
[0], &buf
, 1);
3845 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3848 /* Put something in the pipe, so the event loop wakes up. */
3850 async_file_mark (void)
3854 async_file_flush ();
3857 ret
= write (linux_event_pipe
[1], "+", 1);
3858 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3860 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3861 be awakened anyway. */
3865 linux_wait (ptid_t ptid
,
3866 struct target_waitstatus
*ourstatus
, int target_options
)
3870 /* Flush the async file first. */
3871 if (target_is_async_p ())
3872 async_file_flush ();
3876 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3878 while ((target_options
& TARGET_WNOHANG
) == 0
3879 && ptid_equal (event_ptid
, null_ptid
)
3880 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3882 /* If at least one stop was reported, there may be more. A single
3883 SIGCHLD can signal more than one child stop. */
3884 if (target_is_async_p ()
3885 && (target_options
& TARGET_WNOHANG
) != 0
3886 && !ptid_equal (event_ptid
, null_ptid
))
3892 /* Send a signal to an LWP. */
3895 kill_lwp (unsigned long lwpid
, int signo
)
3900 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3901 if (errno
== ENOSYS
)
3903 /* If tkill fails, then we are not using nptl threads, a
3904 configuration we no longer support. */
3905 perror_with_name (("tkill"));
3911 linux_stop_lwp (struct lwp_info
*lwp
)
3917 send_sigstop (struct lwp_info
*lwp
)
3921 pid
= lwpid_of (get_lwp_thread (lwp
));
3923 /* If we already have a pending stop signal for this process, don't
3925 if (lwp
->stop_expected
)
3928 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3934 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3936 lwp
->stop_expected
= 1;
3937 kill_lwp (pid
, SIGSTOP
);
3941 send_sigstop (thread_info
*thread
, lwp_info
*except
)
3943 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3945 /* Ignore EXCEPT. */
3955 /* Increment the suspend count of an LWP, and stop it, if not stopped
3958 suspend_and_send_sigstop (thread_info
*thread
, lwp_info
*except
)
3960 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3962 /* Ignore EXCEPT. */
3966 lwp_suspended_inc (lwp
);
3968 send_sigstop (thread
, except
);
3972 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3974 /* Store the exit status for later. */
3975 lwp
->status_pending_p
= 1;
3976 lwp
->status_pending
= wstat
;
3978 /* Store in waitstatus as well, as there's nothing else to process
3980 if (WIFEXITED (wstat
))
3982 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
3983 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
3985 else if (WIFSIGNALED (wstat
))
3987 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
3988 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
3991 /* Prevent trying to stop it. */
3994 /* No further stops are expected from a dead lwp. */
3995 lwp
->stop_expected
= 0;
3998 /* Return true if LWP has exited already, and has a pending exit event
3999 to report to GDB. */
4002 lwp_is_marked_dead (struct lwp_info
*lwp
)
4004 return (lwp
->status_pending_p
4005 && (WIFEXITED (lwp
->status_pending
)
4006 || WIFSIGNALED (lwp
->status_pending
)));
4009 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4012 wait_for_sigstop (void)
4014 struct thread_info
*saved_thread
;
4019 saved_thread
= current_thread
;
4020 if (saved_thread
!= NULL
)
4021 saved_tid
= saved_thread
->id
;
4023 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4026 debug_printf ("wait_for_sigstop: pulling events\n");
4028 /* Passing NULL_PTID as filter indicates we want all events to be
4029 left pending. Eventually this returns when there are no
4030 unwaited-for children left. */
4031 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4033 gdb_assert (ret
== -1);
4035 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4036 current_thread
= saved_thread
;
4040 debug_printf ("Previously current thread died.\n");
4042 /* We can't change the current inferior behind GDB's back,
4043 otherwise, a subsequent command may apply to the wrong
4045 current_thread
= NULL
;
4049 /* Returns true if THREAD is stopped in a jump pad, and we can't
4050 move it out, because we need to report the stop event to GDB. For
4051 example, if the user puts a breakpoint in the jump pad, it's
4052 because she wants to debug it. */
4055 stuck_in_jump_pad_callback (thread_info
*thread
)
4057 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4059 if (lwp
->suspended
!= 0)
4061 internal_error (__FILE__
, __LINE__
,
4062 "LWP %ld is suspended, suspended=%d\n",
4063 lwpid_of (thread
), lwp
->suspended
);
4065 gdb_assert (lwp
->stopped
);
4067 /* Allow debugging the jump pad, gdb_collect, etc.. */
4068 return (supports_fast_tracepoints ()
4069 && agent_loaded_p ()
4070 && (gdb_breakpoint_here (lwp
->stop_pc
)
4071 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4072 || thread
->last_resume_kind
== resume_step
)
4073 && (linux_fast_tracepoint_collecting (lwp
, NULL
)
4074 != fast_tpoint_collect_result::not_collecting
));
4078 move_out_of_jump_pad_callback (thread_info
*thread
)
4080 struct thread_info
*saved_thread
;
4081 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4084 if (lwp
->suspended
!= 0)
4086 internal_error (__FILE__
, __LINE__
,
4087 "LWP %ld is suspended, suspended=%d\n",
4088 lwpid_of (thread
), lwp
->suspended
);
4090 gdb_assert (lwp
->stopped
);
4092 /* For gdb_breakpoint_here. */
4093 saved_thread
= current_thread
;
4094 current_thread
= thread
;
4096 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4098 /* Allow debugging the jump pad, gdb_collect, etc. */
4099 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4100 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4101 && thread
->last_resume_kind
!= resume_step
4102 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4105 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4110 lwp
->status_pending_p
= 0;
4111 enqueue_one_deferred_signal (lwp
, wstat
);
4114 debug_printf ("Signal %d for LWP %ld deferred "
4116 WSTOPSIG (*wstat
), lwpid_of (thread
));
4119 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4122 lwp_suspended_inc (lwp
);
4124 current_thread
= saved_thread
;
4128 lwp_running (thread_info
*thread
)
4130 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4132 if (lwp_is_marked_dead (lwp
))
4135 return !lwp
->stopped
;
4138 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4139 If SUSPEND, then also increase the suspend count of every LWP,
4143 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4145 /* Should not be called recursively. */
4146 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4151 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4152 suspend
? "stop-and-suspend" : "stop",
4154 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4158 stopping_threads
= (suspend
4159 ? STOPPING_AND_SUSPENDING_THREADS
4160 : STOPPING_THREADS
);
4163 for_each_thread ([&] (thread_info
*thread
)
4165 suspend_and_send_sigstop (thread
, except
);
4168 for_each_thread ([&] (thread_info
*thread
)
4170 send_sigstop (thread
, except
);
4173 wait_for_sigstop ();
4174 stopping_threads
= NOT_STOPPING_THREADS
;
4178 debug_printf ("stop_all_lwps done, setting stopping_threads "
4179 "back to !stopping\n");
4184 /* Enqueue one signal in the chain of signals which need to be
4185 delivered to this process on next resume. */
4188 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4190 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4192 p_sig
->prev
= lwp
->pending_signals
;
4193 p_sig
->signal
= signal
;
4195 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4197 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4198 lwp
->pending_signals
= p_sig
;
4201 /* Install breakpoints for software single stepping. */
4204 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4206 struct thread_info
*thread
= get_lwp_thread (lwp
);
4207 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4208 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
4210 current_thread
= thread
;
4211 std::vector
<CORE_ADDR
> next_pcs
= the_low_target
.get_next_pcs (regcache
);
4213 for (CORE_ADDR pc
: next_pcs
)
4214 set_single_step_breakpoint (pc
, current_ptid
);
4216 do_cleanups (old_chain
);
4219 /* Single step via hardware or software single step.
4220 Return 1 if hardware single stepping, 0 if software single stepping
4221 or can't single step. */
4224 single_step (struct lwp_info
* lwp
)
4228 if (can_hardware_single_step ())
4232 else if (can_software_single_step ())
4234 install_software_single_step_breakpoints (lwp
);
4240 debug_printf ("stepping is not implemented on this target");
4246 /* The signal can be delivered to the inferior if we are not trying to
4247 finish a fast tracepoint collect. Since signal can be delivered in
4248 the step-over, the program may go to signal handler and trap again
4249 after return from the signal handler. We can live with the spurious
4253 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4255 return (lwp
->collecting_fast_tracepoint
4256 == fast_tpoint_collect_result::not_collecting
);
4259 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4260 SIGNAL is nonzero, give it that signal. */
4263 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4264 int step
, int signal
, siginfo_t
*info
)
4266 struct thread_info
*thread
= get_lwp_thread (lwp
);
4267 struct thread_info
*saved_thread
;
4269 struct process_info
*proc
= get_thread_process (thread
);
4271 /* Note that target description may not be initialised
4272 (proc->tdesc == NULL) at this point because the program hasn't
4273 stopped at the first instruction yet. It means GDBserver skips
4274 the extra traps from the wrapper program (see option --wrapper).
4275 Code in this function that requires register access should be
4276 guarded by proc->tdesc == NULL or something else. */
4278 if (lwp
->stopped
== 0)
4281 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4283 fast_tpoint_collect_result fast_tp_collecting
4284 = lwp
->collecting_fast_tracepoint
;
4286 gdb_assert (!stabilizing_threads
4287 || (fast_tp_collecting
4288 != fast_tpoint_collect_result::not_collecting
));
4290 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4291 user used the "jump" command, or "set $pc = foo"). */
4292 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4294 /* Collecting 'while-stepping' actions doesn't make sense
4296 release_while_stepping_state_list (thread
);
4299 /* If we have pending signals or status, and a new signal, enqueue the
4300 signal. Also enqueue the signal if it can't be delivered to the
4301 inferior right now. */
4303 && (lwp
->status_pending_p
4304 || lwp
->pending_signals
!= NULL
4305 || !lwp_signal_can_be_delivered (lwp
)))
4307 enqueue_pending_signal (lwp
, signal
, info
);
4309 /* Postpone any pending signal. It was enqueued above. */
4313 if (lwp
->status_pending_p
)
4316 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4317 " has pending status\n",
4318 lwpid_of (thread
), step
? "step" : "continue",
4319 lwp
->stop_expected
? "expected" : "not expected");
4323 saved_thread
= current_thread
;
4324 current_thread
= thread
;
4326 /* This bit needs some thinking about. If we get a signal that
4327 we must report while a single-step reinsert is still pending,
4328 we often end up resuming the thread. It might be better to
4329 (ew) allow a stack of pending events; then we could be sure that
4330 the reinsert happened right away and not lose any signals.
4332 Making this stack would also shrink the window in which breakpoints are
4333 uninserted (see comment in linux_wait_for_lwp) but not enough for
4334 complete correctness, so it won't solve that problem. It may be
4335 worthwhile just to solve this one, however. */
4336 if (lwp
->bp_reinsert
!= 0)
4339 debug_printf (" pending reinsert at 0x%s\n",
4340 paddress (lwp
->bp_reinsert
));
4342 if (can_hardware_single_step ())
4344 if (fast_tp_collecting
== fast_tpoint_collect_result::not_collecting
)
4347 warning ("BAD - reinserting but not stepping.");
4349 warning ("BAD - reinserting and suspended(%d).",
4354 step
= maybe_hw_step (thread
);
4357 if (fast_tp_collecting
== fast_tpoint_collect_result::before_insn
)
4360 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4361 " (exit-jump-pad-bkpt)\n",
4364 else if (fast_tp_collecting
== fast_tpoint_collect_result::at_insn
)
4367 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4368 " single-stepping\n",
4371 if (can_hardware_single_step ())
4375 internal_error (__FILE__
, __LINE__
,
4376 "moving out of jump pad single-stepping"
4377 " not implemented on this target");
4381 /* If we have while-stepping actions in this thread set it stepping.
4382 If we have a signal to deliver, it may or may not be set to
4383 SIG_IGN, we don't know. Assume so, and allow collecting
4384 while-stepping into a signal handler. A possible smart thing to
4385 do would be to set an internal breakpoint at the signal return
4386 address, continue, and carry on catching this while-stepping
4387 action only when that breakpoint is hit. A future
4389 if (thread
->while_stepping
!= NULL
)
4392 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4395 step
= single_step (lwp
);
4398 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4400 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4402 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4406 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4407 (long) lwp
->stop_pc
);
4411 /* If we have pending signals, consume one if it can be delivered to
4413 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4415 struct pending_signals
**p_sig
;
4417 p_sig
= &lwp
->pending_signals
;
4418 while ((*p_sig
)->prev
!= NULL
)
4419 p_sig
= &(*p_sig
)->prev
;
4421 signal
= (*p_sig
)->signal
;
4422 if ((*p_sig
)->info
.si_signo
!= 0)
4423 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4431 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4432 lwpid_of (thread
), step
? "step" : "continue", signal
,
4433 lwp
->stop_expected
? "expected" : "not expected");
4435 if (the_low_target
.prepare_to_resume
!= NULL
)
4436 the_low_target
.prepare_to_resume (lwp
);
4438 regcache_invalidate_thread (thread
);
4440 lwp
->stepping
= step
;
4442 ptrace_request
= PTRACE_SINGLESTEP
;
4443 else if (gdb_catching_syscalls_p (lwp
))
4444 ptrace_request
= PTRACE_SYSCALL
;
4446 ptrace_request
= PTRACE_CONT
;
4447 ptrace (ptrace_request
,
4449 (PTRACE_TYPE_ARG3
) 0,
4450 /* Coerce to a uintptr_t first to avoid potential gcc warning
4451 of coercing an 8 byte integer to a 4 byte pointer. */
4452 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4454 current_thread
= saved_thread
;
4456 perror_with_name ("resuming thread");
4458 /* Successfully resumed. Clear state that no longer makes sense,
4459 and mark the LWP as running. Must not do this before resuming
4460 otherwise if that fails other code will be confused. E.g., we'd
4461 later try to stop the LWP and hang forever waiting for a stop
4462 status. Note that we must not throw after this is cleared,
4463 otherwise handle_zombie_lwp_error would get confused. */
4465 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4468 /* Called when we try to resume a stopped LWP and that errors out. If
4469 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4470 or about to become), discard the error, clear any pending status
4471 the LWP may have, and return true (we'll collect the exit status
4472 soon enough). Otherwise, return false. */
4475 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4477 struct thread_info
*thread
= get_lwp_thread (lp
);
4479 /* If we get an error after resuming the LWP successfully, we'd
4480 confuse !T state for the LWP being gone. */
4481 gdb_assert (lp
->stopped
);
4483 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4484 because even if ptrace failed with ESRCH, the tracee may be "not
4485 yet fully dead", but already refusing ptrace requests. In that
4486 case the tracee has 'R (Running)' state for a little bit
4487 (observed in Linux 3.18). See also the note on ESRCH in the
4488 ptrace(2) man page. Instead, check whether the LWP has any state
4489 other than ptrace-stopped. */
4491 /* Don't assume anything if /proc/PID/status can't be read. */
4492 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4494 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4495 lp
->status_pending_p
= 0;
4501 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4502 disappears while we try to resume it. */
4505 linux_resume_one_lwp (struct lwp_info
*lwp
,
4506 int step
, int signal
, siginfo_t
*info
)
4510 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4512 CATCH (ex
, RETURN_MASK_ERROR
)
4514 if (!check_ptrace_stopped_lwp_gone (lwp
))
4515 throw_exception (ex
);
4520 /* This function is called once per thread via for_each_thread.
4521 We look up which resume request applies to THREAD and mark it with a
4522 pointer to the appropriate resume request.
4524 This algorithm is O(threads * resume elements), but resume elements
4525 is small (and will remain small at least until GDB supports thread
4529 linux_set_resume_request (thread_info
*thread
, thread_resume
*resume
, size_t n
)
4531 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4533 for (int ndx
= 0; ndx
< n
; ndx
++)
4535 ptid_t ptid
= resume
[ndx
].thread
;
4536 if (ptid_equal (ptid
, minus_one_ptid
)
4537 || ptid
== thread
->id
4538 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4540 || (ptid_get_pid (ptid
) == pid_of (thread
)
4541 && (ptid_is_pid (ptid
)
4542 || ptid_get_lwp (ptid
) == -1)))
4544 if (resume
[ndx
].kind
== resume_stop
4545 && thread
->last_resume_kind
== resume_stop
)
4548 debug_printf ("already %s LWP %ld at GDB's request\n",
4549 (thread
->last_status
.kind
4550 == TARGET_WAITKIND_STOPPED
)
4558 /* Ignore (wildcard) resume requests for already-resumed
4560 if (resume
[ndx
].kind
!= resume_stop
4561 && thread
->last_resume_kind
!= resume_stop
)
4564 debug_printf ("already %s LWP %ld at GDB's request\n",
4565 (thread
->last_resume_kind
4573 /* Don't let wildcard resumes resume fork children that GDB
4574 does not yet know are new fork children. */
4575 if (lwp
->fork_relative
!= NULL
)
4577 struct lwp_info
*rel
= lwp
->fork_relative
;
4579 if (rel
->status_pending_p
4580 && (rel
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
4581 || rel
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
))
4584 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4590 /* If the thread has a pending event that has already been
4591 reported to GDBserver core, but GDB has not pulled the
4592 event out of the vStopped queue yet, likewise, ignore the
4593 (wildcard) resume request. */
4594 if (in_queued_stop_replies (thread
->id
))
4597 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4602 lwp
->resume
= &resume
[ndx
];
4603 thread
->last_resume_kind
= lwp
->resume
->kind
;
4605 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4606 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4608 /* If we had a deferred signal to report, dequeue one now.
4609 This can happen if LWP gets more than one signal while
4610 trying to get out of a jump pad. */
4612 && !lwp
->status_pending_p
4613 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4615 lwp
->status_pending_p
= 1;
4618 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4619 "leaving status pending.\n",
4620 WSTOPSIG (lwp
->status_pending
),
4628 /* No resume action for this thread. */
4632 /* find_thread callback for linux_resume. Return true if this lwp has an
4633 interesting status pending. */
4636 resume_status_pending_p (thread_info
*thread
)
4638 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4640 /* LWPs which will not be resumed are not interesting, because
4641 we might not wait for them next time through linux_wait. */
4642 if (lwp
->resume
== NULL
)
4645 return thread_still_has_status_pending_p (thread
);
4648 /* Return 1 if this lwp that GDB wants running is stopped at an
4649 internal breakpoint that we need to step over. It assumes that any
4650 required STOP_PC adjustment has already been propagated to the
4651 inferior's regcache. */
4654 need_step_over_p (thread_info
*thread
)
4656 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4657 struct thread_info
*saved_thread
;
4659 struct process_info
*proc
= get_thread_process (thread
);
4661 /* GDBserver is skipping the extra traps from the wrapper program,
4662 don't have to do step over. */
4663 if (proc
->tdesc
== NULL
)
4666 /* LWPs which will not be resumed are not interesting, because we
4667 might not wait for them next time through linux_wait. */
4672 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4677 if (thread
->last_resume_kind
== resume_stop
)
4680 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4686 gdb_assert (lwp
->suspended
>= 0);
4691 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4696 if (lwp
->status_pending_p
)
4699 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4705 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4709 /* If the PC has changed since we stopped, then don't do anything,
4710 and let the breakpoint/tracepoint be hit. This happens if, for
4711 instance, GDB handled the decr_pc_after_break subtraction itself,
4712 GDB is OOL stepping this thread, or the user has issued a "jump"
4713 command, or poked thread's registers herself. */
4714 if (pc
!= lwp
->stop_pc
)
4717 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4718 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4720 paddress (lwp
->stop_pc
), paddress (pc
));
4724 /* On software single step target, resume the inferior with signal
4725 rather than stepping over. */
4726 if (can_software_single_step ()
4727 && lwp
->pending_signals
!= NULL
4728 && lwp_signal_can_be_delivered (lwp
))
4731 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4738 saved_thread
= current_thread
;
4739 current_thread
= thread
;
4741 /* We can only step over breakpoints we know about. */
4742 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4744 /* Don't step over a breakpoint that GDB expects to hit
4745 though. If the condition is being evaluated on the target's side
4746 and it evaluate to false, step over this breakpoint as well. */
4747 if (gdb_breakpoint_here (pc
)
4748 && gdb_condition_true_at_breakpoint (pc
)
4749 && gdb_no_commands_at_breakpoint (pc
))
4752 debug_printf ("Need step over [LWP %ld]? yes, but found"
4753 " GDB breakpoint at 0x%s; skipping step over\n",
4754 lwpid_of (thread
), paddress (pc
));
4756 current_thread
= saved_thread
;
4762 debug_printf ("Need step over [LWP %ld]? yes, "
4763 "found breakpoint at 0x%s\n",
4764 lwpid_of (thread
), paddress (pc
));
4766 /* We've found an lwp that needs stepping over --- return 1 so
4767 that find_thread stops looking. */
4768 current_thread
= saved_thread
;
4774 current_thread
= saved_thread
;
4777 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4779 lwpid_of (thread
), paddress (pc
));
4784 /* Start a step-over operation on LWP. When LWP stopped at a
4785 breakpoint, to make progress, we need to remove the breakpoint out
4786 of the way. If we let other threads run while we do that, they may
4787 pass by the breakpoint location and miss hitting it. To avoid
4788 that, a step-over momentarily stops all threads while LWP is
4789 single-stepped by either hardware or software while the breakpoint
4790 is temporarily uninserted from the inferior. When the single-step
4791 finishes, we reinsert the breakpoint, and let all threads that are
4792 supposed to be running, run again. */
4795 start_step_over (struct lwp_info
*lwp
)
4797 struct thread_info
*thread
= get_lwp_thread (lwp
);
4798 struct thread_info
*saved_thread
;
4803 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4806 stop_all_lwps (1, lwp
);
4808 if (lwp
->suspended
!= 0)
4810 internal_error (__FILE__
, __LINE__
,
4811 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4816 debug_printf ("Done stopping all threads for step-over.\n");
4818 /* Note, we should always reach here with an already adjusted PC,
4819 either by GDB (if we're resuming due to GDB's request), or by our
4820 caller, if we just finished handling an internal breakpoint GDB
4821 shouldn't care about. */
4824 saved_thread
= current_thread
;
4825 current_thread
= thread
;
4827 lwp
->bp_reinsert
= pc
;
4828 uninsert_breakpoints_at (pc
);
4829 uninsert_fast_tracepoint_jumps_at (pc
);
4831 step
= single_step (lwp
);
4833 current_thread
= saved_thread
;
4835 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4837 /* Require next event from this LWP. */
4838 step_over_bkpt
= thread
->id
;
4842 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4843 start_step_over, if still there, and delete any single-step
4844 breakpoints we've set, on non hardware single-step targets. */
4847 finish_step_over (struct lwp_info
*lwp
)
4849 if (lwp
->bp_reinsert
!= 0)
4851 struct thread_info
*saved_thread
= current_thread
;
4854 debug_printf ("Finished step over.\n");
4856 current_thread
= get_lwp_thread (lwp
);
4858 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4859 may be no breakpoint to reinsert there by now. */
4860 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4861 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4863 lwp
->bp_reinsert
= 0;
4865 /* Delete any single-step breakpoints. No longer needed. We
4866 don't have to worry about other threads hitting this trap,
4867 and later not being able to explain it, because we were
4868 stepping over a breakpoint, and we hold all threads but
4869 LWP stopped while doing that. */
4870 if (!can_hardware_single_step ())
4872 gdb_assert (has_single_step_breakpoints (current_thread
));
4873 delete_single_step_breakpoints (current_thread
);
4876 step_over_bkpt
= null_ptid
;
4877 current_thread
= saved_thread
;
4884 /* If there's a step over in progress, wait until all threads stop
4885 (that is, until the stepping thread finishes its step), and
4886 unsuspend all lwps. The stepping thread ends with its status
4887 pending, which is processed later when we get back to processing
4891 complete_ongoing_step_over (void)
4893 if (!ptid_equal (step_over_bkpt
, null_ptid
))
4895 struct lwp_info
*lwp
;
4900 debug_printf ("detach: step over in progress, finish it first\n");
4902 /* Passing NULL_PTID as filter indicates we want all events to
4903 be left pending. Eventually this returns when there are no
4904 unwaited-for children left. */
4905 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4907 gdb_assert (ret
== -1);
4909 lwp
= find_lwp_pid (step_over_bkpt
);
4911 finish_step_over (lwp
);
4912 step_over_bkpt
= null_ptid
;
4913 unsuspend_all_lwps (lwp
);
4917 /* This function is called once per thread. We check the thread's resume
4918 request, which will tell us whether to resume, step, or leave the thread
4919 stopped; and what signal, if any, it should be sent.
4921 For threads which we aren't explicitly told otherwise, we preserve
4922 the stepping flag; this is used for stepping over gdbserver-placed
4925 If pending_flags was set in any thread, we queue any needed
4926 signals, since we won't actually resume. We already have a pending
4927 event to report, so we don't need to preserve any step requests;
4928 they should be re-issued if necessary. */
4931 linux_resume_one_thread (thread_info
*thread
, bool leave_all_stopped
)
4933 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4936 if (lwp
->resume
== NULL
)
4939 if (lwp
->resume
->kind
== resume_stop
)
4942 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4947 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
4949 /* Stop the thread, and wait for the event asynchronously,
4950 through the event loop. */
4956 debug_printf ("already stopped LWP %ld\n",
4959 /* The LWP may have been stopped in an internal event that
4960 was not meant to be notified back to GDB (e.g., gdbserver
4961 breakpoint), so we should be reporting a stop event in
4964 /* If the thread already has a pending SIGSTOP, this is a
4965 no-op. Otherwise, something later will presumably resume
4966 the thread and this will cause it to cancel any pending
4967 operation, due to last_resume_kind == resume_stop. If
4968 the thread already has a pending status to report, we
4969 will still report it the next time we wait - see
4970 status_pending_p_callback. */
4972 /* If we already have a pending signal to report, then
4973 there's no need to queue a SIGSTOP, as this means we're
4974 midway through moving the LWP out of the jumppad, and we
4975 will report the pending signal as soon as that is
4977 if (lwp
->pending_signals_to_report
== NULL
)
4981 /* For stop requests, we're done. */
4983 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4987 /* If this thread which is about to be resumed has a pending status,
4988 then don't resume it - we can just report the pending status.
4989 Likewise if it is suspended, because e.g., another thread is
4990 stepping past a breakpoint. Make sure to queue any signals that
4991 would otherwise be sent. In all-stop mode, we do this decision
4992 based on if *any* thread has a pending status. If there's a
4993 thread that needs the step-over-breakpoint dance, then don't
4994 resume any other thread but that particular one. */
4995 leave_pending
= (lwp
->suspended
4996 || lwp
->status_pending_p
4997 || leave_all_stopped
);
4999 /* If we have a new signal, enqueue the signal. */
5000 if (lwp
->resume
->sig
!= 0)
5002 siginfo_t info
, *info_p
;
5004 /* If this is the same signal we were previously stopped by,
5005 make sure to queue its siginfo. */
5006 if (WIFSTOPPED (lwp
->last_status
)
5007 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
5008 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
5009 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
5014 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
5020 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
5022 proceed_one_lwp (thread
, NULL
);
5027 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5030 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5035 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5037 struct thread_info
*need_step_over
= NULL
;
5042 debug_printf ("linux_resume:\n");
5045 for_each_thread ([&] (thread_info
*thread
)
5047 linux_set_resume_request (thread
, resume_info
, n
);
5050 /* If there is a thread which would otherwise be resumed, which has
5051 a pending status, then don't resume any threads - we can just
5052 report the pending status. Make sure to queue any signals that
5053 would otherwise be sent. In non-stop mode, we'll apply this
5054 logic to each thread individually. We consume all pending events
5055 before considering to start a step-over (in all-stop). */
5056 bool any_pending
= false;
5058 any_pending
= find_thread (resume_status_pending_p
) != NULL
;
5060 /* If there is a thread which would otherwise be resumed, which is
5061 stopped at a breakpoint that needs stepping over, then don't
5062 resume any threads - have it step over the breakpoint with all
5063 other threads stopped, then resume all threads again. Make sure
5064 to queue any signals that would otherwise be delivered or
5066 if (!any_pending
&& supports_breakpoints ())
5067 need_step_over
= find_thread (need_step_over_p
);
5069 bool leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5073 if (need_step_over
!= NULL
)
5074 debug_printf ("Not resuming all, need step over\n");
5075 else if (any_pending
)
5076 debug_printf ("Not resuming, all-stop and found "
5077 "an LWP with pending status\n");
5079 debug_printf ("Resuming, no pending status or step over needed\n");
5082 /* Even if we're leaving threads stopped, queue all signals we'd
5083 otherwise deliver. */
5084 for_each_thread ([&] (thread_info
*thread
)
5086 linux_resume_one_thread (thread
, leave_all_stopped
);
5090 start_step_over (get_thread_lwp (need_step_over
));
5094 debug_printf ("linux_resume done\n");
5098 /* We may have events that were pending that can/should be sent to
5099 the client now. Trigger a linux_wait call. */
5100 if (target_is_async_p ())
5104 /* This function is called once per thread. We check the thread's
5105 last resume request, which will tell us whether to resume, step, or
5106 leave the thread stopped. Any signal the client requested to be
5107 delivered has already been enqueued at this point.
5109 If any thread that GDB wants running is stopped at an internal
5110 breakpoint that needs stepping over, we start a step-over operation
5111 on that particular thread, and leave all others stopped. */
5114 proceed_one_lwp (thread_info
*thread
, lwp_info
*except
)
5116 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5123 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5128 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5132 if (thread
->last_resume_kind
== resume_stop
5133 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5136 debug_printf (" client wants LWP to remain %ld stopped\n",
5141 if (lwp
->status_pending_p
)
5144 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5149 gdb_assert (lwp
->suspended
>= 0);
5154 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5158 if (thread
->last_resume_kind
== resume_stop
5159 && lwp
->pending_signals_to_report
== NULL
5160 && (lwp
->collecting_fast_tracepoint
5161 == fast_tpoint_collect_result::not_collecting
))
5163 /* We haven't reported this LWP as stopped yet (otherwise, the
5164 last_status.kind check above would catch it, and we wouldn't
5165 reach here. This LWP may have been momentarily paused by a
5166 stop_all_lwps call while handling for example, another LWP's
5167 step-over. In that case, the pending expected SIGSTOP signal
5168 that was queued at vCont;t handling time will have already
5169 been consumed by wait_for_sigstop, and so we need to requeue
5170 another one here. Note that if the LWP already has a SIGSTOP
5171 pending, this is a no-op. */
5174 debug_printf ("Client wants LWP %ld to stop. "
5175 "Making sure it has a SIGSTOP pending\n",
5181 if (thread
->last_resume_kind
== resume_step
)
5184 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5187 /* If resume_step is requested by GDB, install single-step
5188 breakpoints when the thread is about to be actually resumed if
5189 the single-step breakpoints weren't removed. */
5190 if (can_software_single_step ()
5191 && !has_single_step_breakpoints (thread
))
5192 install_software_single_step_breakpoints (lwp
);
5194 step
= maybe_hw_step (thread
);
5196 else if (lwp
->bp_reinsert
!= 0)
5199 debug_printf (" stepping LWP %ld, reinsert set\n",
5202 step
= maybe_hw_step (thread
);
5207 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5211 unsuspend_and_proceed_one_lwp (thread_info
*thread
, lwp_info
*except
)
5213 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5218 lwp_suspended_decr (lwp
);
5220 proceed_one_lwp (thread
, except
);
5223 /* When we finish a step-over, set threads running again. If there's
5224 another thread that may need a step-over, now's the time to start
5225 it. Eventually, we'll move all threads past their breakpoints. */
5228 proceed_all_lwps (void)
5230 struct thread_info
*need_step_over
;
5232 /* If there is a thread which would otherwise be resumed, which is
5233 stopped at a breakpoint that needs stepping over, then don't
5234 resume any threads - have it step over the breakpoint with all
5235 other threads stopped, then resume all threads again. */
5237 if (supports_breakpoints ())
5239 need_step_over
= find_thread (need_step_over_p
);
5241 if (need_step_over
!= NULL
)
5244 debug_printf ("proceed_all_lwps: found "
5245 "thread %ld needing a step-over\n",
5246 lwpid_of (need_step_over
));
5248 start_step_over (get_thread_lwp (need_step_over
));
5254 debug_printf ("Proceeding, no step-over needed\n");
5256 for_each_thread ([] (thread_info
*thread
)
5258 proceed_one_lwp (thread
, NULL
);
5262 /* Stopped LWPs that the client wanted to be running, that don't have
5263 pending statuses, are set to run again, except for EXCEPT, if not
5264 NULL. This undoes a stop_all_lwps call. */
5267 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5273 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5274 lwpid_of (get_lwp_thread (except
)));
5276 debug_printf ("unstopping all lwps\n");
5280 for_each_thread ([&] (thread_info
*thread
)
5282 unsuspend_and_proceed_one_lwp (thread
, except
);
5285 for_each_thread ([&] (thread_info
*thread
)
5287 proceed_one_lwp (thread
, except
);
5292 debug_printf ("unstop_all_lwps done\n");
5298 #ifdef HAVE_LINUX_REGSETS
5300 #define use_linux_regsets 1
5302 /* Returns true if REGSET has been disabled. */
5305 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5307 return (info
->disabled_regsets
!= NULL
5308 && info
->disabled_regsets
[regset
- info
->regsets
]);
5311 /* Disable REGSET. */
5314 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5318 dr_offset
= regset
- info
->regsets
;
5319 if (info
->disabled_regsets
== NULL
)
5320 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5321 info
->disabled_regsets
[dr_offset
] = 1;
5325 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5326 struct regcache
*regcache
)
5328 struct regset_info
*regset
;
5329 int saw_general_regs
= 0;
5333 pid
= lwpid_of (current_thread
);
5334 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5339 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5342 buf
= xmalloc (regset
->size
);
5344 nt_type
= regset
->nt_type
;
5348 iov
.iov_len
= regset
->size
;
5349 data
= (void *) &iov
;
5355 res
= ptrace (regset
->get_request
, pid
,
5356 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5358 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5364 /* If we get EIO on a regset, do not try it again for
5365 this process mode. */
5366 disable_regset (regsets_info
, regset
);
5368 else if (errno
== ENODATA
)
5370 /* ENODATA may be returned if the regset is currently
5371 not "active". This can happen in normal operation,
5372 so suppress the warning in this case. */
5374 else if (errno
== ESRCH
)
5376 /* At this point, ESRCH should mean the process is
5377 already gone, in which case we simply ignore attempts
5378 to read its registers. */
5383 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5390 if (regset
->type
== GENERAL_REGS
)
5391 saw_general_regs
= 1;
5392 regset
->store_function (regcache
, buf
);
5396 if (saw_general_regs
)
5403 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5404 struct regcache
*regcache
)
5406 struct regset_info
*regset
;
5407 int saw_general_regs
= 0;
5411 pid
= lwpid_of (current_thread
);
5412 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5417 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5418 || regset
->fill_function
== NULL
)
5421 buf
= xmalloc (regset
->size
);
5423 /* First fill the buffer with the current register set contents,
5424 in case there are any items in the kernel's regset that are
5425 not in gdbserver's regcache. */
5427 nt_type
= regset
->nt_type
;
5431 iov
.iov_len
= regset
->size
;
5432 data
= (void *) &iov
;
5438 res
= ptrace (regset
->get_request
, pid
,
5439 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5441 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5446 /* Then overlay our cached registers on that. */
5447 regset
->fill_function (regcache
, buf
);
5449 /* Only now do we write the register set. */
5451 res
= ptrace (regset
->set_request
, pid
,
5452 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5454 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5462 /* If we get EIO on a regset, do not try it again for
5463 this process mode. */
5464 disable_regset (regsets_info
, regset
);
5466 else if (errno
== ESRCH
)
5468 /* At this point, ESRCH should mean the process is
5469 already gone, in which case we simply ignore attempts
5470 to change its registers. See also the related
5471 comment in linux_resume_one_lwp. */
5477 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5480 else if (regset
->type
== GENERAL_REGS
)
5481 saw_general_regs
= 1;
5484 if (saw_general_regs
)
5490 #else /* !HAVE_LINUX_REGSETS */
5492 #define use_linux_regsets 0
5493 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5494 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5498 /* Return 1 if register REGNO is supported by one of the regset ptrace
5499 calls or 0 if it has to be transferred individually. */
5502 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5504 unsigned char mask
= 1 << (regno
% 8);
5505 size_t index
= regno
/ 8;
5507 return (use_linux_regsets
5508 && (regs_info
->regset_bitmap
== NULL
5509 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5512 #ifdef HAVE_LINUX_USRREGS
5515 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5519 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5520 error ("Invalid register number %d.", regnum
);
5522 addr
= usrregs
->regmap
[regnum
];
5527 /* Fetch one register. */
5529 fetch_register (const struct usrregs_info
*usrregs
,
5530 struct regcache
*regcache
, int regno
)
5537 if (regno
>= usrregs
->num_regs
)
5539 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5542 regaddr
= register_addr (usrregs
, regno
);
5546 size
= ((register_size (regcache
->tdesc
, regno
)
5547 + sizeof (PTRACE_XFER_TYPE
) - 1)
5548 & -sizeof (PTRACE_XFER_TYPE
));
5549 buf
= (char *) alloca (size
);
5551 pid
= lwpid_of (current_thread
);
5552 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5555 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5556 ptrace (PTRACE_PEEKUSER
, pid
,
5557 /* Coerce to a uintptr_t first to avoid potential gcc warning
5558 of coercing an 8 byte integer to a 4 byte pointer. */
5559 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5560 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5563 /* Mark register REGNO unavailable. */
5564 supply_register (regcache
, regno
, NULL
);
5569 if (the_low_target
.supply_ptrace_register
)
5570 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5572 supply_register (regcache
, regno
, buf
);
5575 /* Store one register. */
5577 store_register (const struct usrregs_info
*usrregs
,
5578 struct regcache
*regcache
, int regno
)
5585 if (regno
>= usrregs
->num_regs
)
5587 if ((*the_low_target
.cannot_store_register
) (regno
))
5590 regaddr
= register_addr (usrregs
, regno
);
5594 size
= ((register_size (regcache
->tdesc
, regno
)
5595 + sizeof (PTRACE_XFER_TYPE
) - 1)
5596 & -sizeof (PTRACE_XFER_TYPE
));
5597 buf
= (char *) alloca (size
);
5598 memset (buf
, 0, size
);
5600 if (the_low_target
.collect_ptrace_register
)
5601 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5603 collect_register (regcache
, regno
, buf
);
5605 pid
= lwpid_of (current_thread
);
5606 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5609 ptrace (PTRACE_POKEUSER
, pid
,
5610 /* Coerce to a uintptr_t first to avoid potential gcc warning
5611 about coercing an 8 byte integer to a 4 byte pointer. */
5612 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5613 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5616 /* At this point, ESRCH should mean the process is
5617 already gone, in which case we simply ignore attempts
5618 to change its registers. See also the related
5619 comment in linux_resume_one_lwp. */
5623 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5624 error ("writing register %d: %s", regno
, strerror (errno
));
5626 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5630 /* Fetch all registers, or just one, from the child process.
5631 If REGNO is -1, do this for all registers, skipping any that are
5632 assumed to have been retrieved by regsets_fetch_inferior_registers,
5633 unless ALL is non-zero.
5634 Otherwise, REGNO specifies which register (so we can save time). */
5636 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5637 struct regcache
*regcache
, int regno
, int all
)
5639 struct usrregs_info
*usr
= regs_info
->usrregs
;
5643 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5644 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5645 fetch_register (usr
, regcache
, regno
);
5648 fetch_register (usr
, regcache
, regno
);
5651 /* Store our register values back into the inferior.
5652 If REGNO is -1, do this for all registers, skipping any that are
5653 assumed to have been saved by regsets_store_inferior_registers,
5654 unless ALL is non-zero.
5655 Otherwise, REGNO specifies which register (so we can save time). */
5657 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5658 struct regcache
*regcache
, int regno
, int all
)
5660 struct usrregs_info
*usr
= regs_info
->usrregs
;
5664 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5665 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5666 store_register (usr
, regcache
, regno
);
5669 store_register (usr
, regcache
, regno
);
5672 #else /* !HAVE_LINUX_USRREGS */
5674 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5675 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5681 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5685 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5689 if (the_low_target
.fetch_register
!= NULL
5690 && regs_info
->usrregs
!= NULL
)
5691 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5692 (*the_low_target
.fetch_register
) (regcache
, regno
);
5694 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5695 if (regs_info
->usrregs
!= NULL
)
5696 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5700 if (the_low_target
.fetch_register
!= NULL
5701 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5704 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5706 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5708 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5709 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5714 linux_store_registers (struct regcache
*regcache
, int regno
)
5718 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5722 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5724 if (regs_info
->usrregs
!= NULL
)
5725 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5729 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5731 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5733 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5734 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5739 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5740 to debugger memory starting at MYADDR. */
5743 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5745 int pid
= lwpid_of (current_thread
);
5746 PTRACE_XFER_TYPE
*buffer
;
5754 /* Try using /proc. Don't bother for one word. */
5755 if (len
>= 3 * sizeof (long))
5759 /* We could keep this file open and cache it - possibly one per
5760 thread. That requires some juggling, but is even faster. */
5761 sprintf (filename
, "/proc/%d/mem", pid
);
5762 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5766 /* If pread64 is available, use it. It's faster if the kernel
5767 supports it (only one syscall), and it's 64-bit safe even on
5768 32-bit platforms (for instance, SPARC debugging a SPARC64
5771 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5774 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5775 bytes
= read (fd
, myaddr
, len
);
5782 /* Some data was read, we'll try to get the rest with ptrace. */
5792 /* Round starting address down to longword boundary. */
5793 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5794 /* Round ending address up; get number of longwords that makes. */
5795 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5796 / sizeof (PTRACE_XFER_TYPE
));
5797 /* Allocate buffer of that many longwords. */
5798 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5800 /* Read all the longwords */
5802 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5804 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5805 about coercing an 8 byte integer to a 4 byte pointer. */
5806 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5807 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5808 (PTRACE_TYPE_ARG4
) 0);
5814 /* Copy appropriate bytes out of the buffer. */
5817 i
*= sizeof (PTRACE_XFER_TYPE
);
5818 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5820 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5827 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5828 memory at MEMADDR. On failure (cannot write to the inferior)
5829 returns the value of errno. Always succeeds if LEN is zero. */
5832 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5835 /* Round starting address down to longword boundary. */
5836 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5837 /* Round ending address up; get number of longwords that makes. */
5839 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5840 / sizeof (PTRACE_XFER_TYPE
);
5842 /* Allocate buffer of that many longwords. */
5843 PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5845 int pid
= lwpid_of (current_thread
);
5849 /* Zero length write always succeeds. */
5855 /* Dump up to four bytes. */
5856 char str
[4 * 2 + 1];
5858 int dump
= len
< 4 ? len
: 4;
5860 for (i
= 0; i
< dump
; i
++)
5862 sprintf (p
, "%02x", myaddr
[i
]);
5867 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5868 str
, (long) memaddr
, pid
);
5871 /* Fill start and end extra bytes of buffer with existing memory data. */
5874 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5875 about coercing an 8 byte integer to a 4 byte pointer. */
5876 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5877 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5878 (PTRACE_TYPE_ARG4
) 0);
5886 = ptrace (PTRACE_PEEKTEXT
, pid
,
5887 /* Coerce to a uintptr_t first to avoid potential gcc warning
5888 about coercing an 8 byte integer to a 4 byte pointer. */
5889 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5890 * sizeof (PTRACE_XFER_TYPE
)),
5891 (PTRACE_TYPE_ARG4
) 0);
5896 /* Copy data to be written over corresponding part of buffer. */
5898 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5901 /* Write the entire buffer. */
5903 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5906 ptrace (PTRACE_POKETEXT
, pid
,
5907 /* Coerce to a uintptr_t first to avoid potential gcc warning
5908 about coercing an 8 byte integer to a 4 byte pointer. */
5909 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5910 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5919 linux_look_up_symbols (void)
5921 #ifdef USE_THREAD_DB
5922 struct process_info
*proc
= current_process ();
5924 if (proc
->priv
->thread_db
!= NULL
)
5932 linux_request_interrupt (void)
5934 /* Send a SIGINT to the process group. This acts just like the user
5935 typed a ^C on the controlling terminal. */
5936 kill (-signal_pid
, SIGINT
);
5939 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5940 to debugger memory starting at MYADDR. */
5943 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5945 char filename
[PATH_MAX
];
5947 int pid
= lwpid_of (current_thread
);
5949 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5951 fd
= open (filename
, O_RDONLY
);
5955 if (offset
!= (CORE_ADDR
) 0
5956 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5959 n
= read (fd
, myaddr
, len
);
5966 /* These breakpoint and watchpoint related wrapper functions simply
5967 pass on the function call if the target has registered a
5968 corresponding function. */
5971 linux_supports_z_point_type (char z_type
)
5973 return (the_low_target
.supports_z_point_type
!= NULL
5974 && the_low_target
.supports_z_point_type (z_type
));
5978 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5979 int size
, struct raw_breakpoint
*bp
)
5981 if (type
== raw_bkpt_type_sw
)
5982 return insert_memory_breakpoint (bp
);
5983 else if (the_low_target
.insert_point
!= NULL
)
5984 return the_low_target
.insert_point (type
, addr
, size
, bp
);
5986 /* Unsupported (see target.h). */
5991 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5992 int size
, struct raw_breakpoint
*bp
)
5994 if (type
== raw_bkpt_type_sw
)
5995 return remove_memory_breakpoint (bp
);
5996 else if (the_low_target
.remove_point
!= NULL
)
5997 return the_low_target
.remove_point (type
, addr
, size
, bp
);
5999 /* Unsupported (see target.h). */
6003 /* Implement the to_stopped_by_sw_breakpoint target_ops
6007 linux_stopped_by_sw_breakpoint (void)
6009 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6011 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
6014 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
6018 linux_supports_stopped_by_sw_breakpoint (void)
6020 return USE_SIGTRAP_SIGINFO
;
6023 /* Implement the to_stopped_by_hw_breakpoint target_ops
6027 linux_stopped_by_hw_breakpoint (void)
6029 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6031 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6034 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6038 linux_supports_stopped_by_hw_breakpoint (void)
6040 return USE_SIGTRAP_SIGINFO
;
6043 /* Implement the supports_hardware_single_step target_ops method. */
6046 linux_supports_hardware_single_step (void)
6048 return can_hardware_single_step ();
6052 linux_supports_software_single_step (void)
6054 return can_software_single_step ();
6058 linux_stopped_by_watchpoint (void)
6060 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6062 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6066 linux_stopped_data_address (void)
6068 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6070 return lwp
->stopped_data_address
;
6073 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6074 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6075 && defined(PT_TEXT_END_ADDR)
6077 /* This is only used for targets that define PT_TEXT_ADDR,
6078 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6079 the target has different ways of acquiring this information, like
6082 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6083 to tell gdb about. */
6086 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6088 unsigned long text
, text_end
, data
;
6089 int pid
= lwpid_of (current_thread
);
6093 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6094 (PTRACE_TYPE_ARG4
) 0);
6095 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6096 (PTRACE_TYPE_ARG4
) 0);
6097 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6098 (PTRACE_TYPE_ARG4
) 0);
6102 /* Both text and data offsets produced at compile-time (and so
6103 used by gdb) are relative to the beginning of the program,
6104 with the data segment immediately following the text segment.
6105 However, the actual runtime layout in memory may put the data
6106 somewhere else, so when we send gdb a data base-address, we
6107 use the real data base address and subtract the compile-time
6108 data base-address from it (which is just the length of the
6109 text segment). BSS immediately follows data in both
6112 *data_p
= data
- (text_end
- text
);
6121 linux_qxfer_osdata (const char *annex
,
6122 unsigned char *readbuf
, unsigned const char *writebuf
,
6123 CORE_ADDR offset
, int len
)
6125 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6128 /* Convert a native/host siginfo object, into/from the siginfo in the
6129 layout of the inferiors' architecture. */
6132 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6136 if (the_low_target
.siginfo_fixup
!= NULL
)
6137 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6139 /* If there was no callback, or the callback didn't do anything,
6140 then just do a straight memcpy. */
6144 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6146 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6151 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6152 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6156 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6158 if (current_thread
== NULL
)
6161 pid
= lwpid_of (current_thread
);
6164 debug_printf ("%s siginfo for lwp %d.\n",
6165 readbuf
!= NULL
? "Reading" : "Writing",
6168 if (offset
>= sizeof (siginfo
))
6171 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6174 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6175 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6176 inferior with a 64-bit GDBSERVER should look the same as debugging it
6177 with a 32-bit GDBSERVER, we need to convert it. */
6178 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6180 if (offset
+ len
> sizeof (siginfo
))
6181 len
= sizeof (siginfo
) - offset
;
6183 if (readbuf
!= NULL
)
6184 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6187 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6189 /* Convert back to ptrace layout before flushing it out. */
6190 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6192 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6199 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6200 so we notice when children change state; as the handler for the
6201 sigsuspend in my_waitpid. */
6204 sigchld_handler (int signo
)
6206 int old_errno
= errno
;
6212 /* fprintf is not async-signal-safe, so call write
6214 if (write (2, "sigchld_handler\n",
6215 sizeof ("sigchld_handler\n") - 1) < 0)
6216 break; /* just ignore */
6220 if (target_is_async_p ())
6221 async_file_mark (); /* trigger a linux_wait */
6227 linux_supports_non_stop (void)
6233 linux_async (int enable
)
6235 int previous
= target_is_async_p ();
6238 debug_printf ("linux_async (%d), previous=%d\n",
6241 if (previous
!= enable
)
6244 sigemptyset (&mask
);
6245 sigaddset (&mask
, SIGCHLD
);
6247 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6251 if (pipe (linux_event_pipe
) == -1)
6253 linux_event_pipe
[0] = -1;
6254 linux_event_pipe
[1] = -1;
6255 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6257 warning ("creating event pipe failed.");
6261 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6262 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6264 /* Register the event loop handler. */
6265 add_file_handler (linux_event_pipe
[0],
6266 handle_target_event
, NULL
);
6268 /* Always trigger a linux_wait. */
6273 delete_file_handler (linux_event_pipe
[0]);
6275 close (linux_event_pipe
[0]);
6276 close (linux_event_pipe
[1]);
6277 linux_event_pipe
[0] = -1;
6278 linux_event_pipe
[1] = -1;
6281 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6288 linux_start_non_stop (int nonstop
)
6290 /* Register or unregister from event-loop accordingly. */
6291 linux_async (nonstop
);
6293 if (target_is_async_p () != (nonstop
!= 0))
6300 linux_supports_multi_process (void)
6305 /* Check if fork events are supported. */
6308 linux_supports_fork_events (void)
6310 return linux_supports_tracefork ();
6313 /* Check if vfork events are supported. */
6316 linux_supports_vfork_events (void)
6318 return linux_supports_tracefork ();
6321 /* Check if exec events are supported. */
6324 linux_supports_exec_events (void)
6326 return linux_supports_traceexec ();
6329 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6330 ptrace flags for all inferiors. This is in case the new GDB connection
6331 doesn't support the same set of events that the previous one did. */
6334 linux_handle_new_gdb_connection (void)
6336 /* Request that all the lwps reset their ptrace options. */
6337 for_each_thread ([] (thread_info
*thread
)
6339 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6343 /* Stop the lwp so we can modify its ptrace options. */
6344 lwp
->must_set_ptrace_flags
= 1;
6345 linux_stop_lwp (lwp
);
6349 /* Already stopped; go ahead and set the ptrace options. */
6350 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6351 int options
= linux_low_ptrace_options (proc
->attached
);
6353 linux_enable_event_reporting (lwpid_of (thread
), options
);
6354 lwp
->must_set_ptrace_flags
= 0;
6360 linux_supports_disable_randomization (void)
6362 #ifdef HAVE_PERSONALITY
6370 linux_supports_agent (void)
6376 linux_supports_range_stepping (void)
6378 if (can_software_single_step ())
6380 if (*the_low_target
.supports_range_stepping
== NULL
)
6383 return (*the_low_target
.supports_range_stepping
) ();
6386 /* Enumerate spufs IDs for process PID. */
6388 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6394 struct dirent
*entry
;
6396 sprintf (path
, "/proc/%ld/fd", pid
);
6397 dir
= opendir (path
);
6402 while ((entry
= readdir (dir
)) != NULL
)
6408 fd
= atoi (entry
->d_name
);
6412 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6413 if (stat (path
, &st
) != 0)
6415 if (!S_ISDIR (st
.st_mode
))
6418 if (statfs (path
, &stfs
) != 0)
6420 if (stfs
.f_type
!= SPUFS_MAGIC
)
6423 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6425 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6435 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6436 object type, using the /proc file system. */
6438 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6439 unsigned const char *writebuf
,
6440 CORE_ADDR offset
, int len
)
6442 long pid
= lwpid_of (current_thread
);
6447 if (!writebuf
&& !readbuf
)
6455 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6458 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6459 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6464 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6471 ret
= write (fd
, writebuf
, (size_t) len
);
6473 ret
= read (fd
, readbuf
, (size_t) len
);
6479 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6480 struct target_loadseg
6482 /* Core address to which the segment is mapped. */
6484 /* VMA recorded in the program header. */
6486 /* Size of this segment in memory. */
6490 # if defined PT_GETDSBT
6491 struct target_loadmap
6493 /* Protocol version number, must be zero. */
6495 /* Pointer to the DSBT table, its size, and the DSBT index. */
6496 unsigned *dsbt_table
;
6497 unsigned dsbt_size
, dsbt_index
;
6498 /* Number of segments in this map. */
6500 /* The actual memory map. */
6501 struct target_loadseg segs
[/*nsegs*/];
6503 # define LINUX_LOADMAP PT_GETDSBT
6504 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6505 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6507 struct target_loadmap
6509 /* Protocol version number, must be zero. */
6511 /* Number of segments in this map. */
6513 /* The actual memory map. */
6514 struct target_loadseg segs
[/*nsegs*/];
6516 # define LINUX_LOADMAP PTRACE_GETFDPIC
6517 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6518 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6522 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6523 unsigned char *myaddr
, unsigned int len
)
6525 int pid
= lwpid_of (current_thread
);
6527 struct target_loadmap
*data
= NULL
;
6528 unsigned int actual_length
, copy_length
;
6530 if (strcmp (annex
, "exec") == 0)
6531 addr
= (int) LINUX_LOADMAP_EXEC
;
6532 else if (strcmp (annex
, "interp") == 0)
6533 addr
= (int) LINUX_LOADMAP_INTERP
;
6537 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6543 actual_length
= sizeof (struct target_loadmap
)
6544 + sizeof (struct target_loadseg
) * data
->nsegs
;
6546 if (offset
< 0 || offset
> actual_length
)
6549 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6550 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6554 # define linux_read_loadmap NULL
6555 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6558 linux_process_qsupported (char **features
, int count
)
6560 if (the_low_target
.process_qsupported
!= NULL
)
6561 the_low_target
.process_qsupported (features
, count
);
6565 linux_supports_catch_syscall (void)
6567 return (the_low_target
.get_syscall_trapinfo
!= NULL
6568 && linux_supports_tracesysgood ());
6572 linux_get_ipa_tdesc_idx (void)
6574 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6577 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6581 linux_supports_tracepoints (void)
6583 if (*the_low_target
.supports_tracepoints
== NULL
)
6586 return (*the_low_target
.supports_tracepoints
) ();
6590 linux_read_pc (struct regcache
*regcache
)
6592 if (the_low_target
.get_pc
== NULL
)
6595 return (*the_low_target
.get_pc
) (regcache
);
6599 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6601 gdb_assert (the_low_target
.set_pc
!= NULL
);
6603 (*the_low_target
.set_pc
) (regcache
, pc
);
6607 linux_thread_stopped (struct thread_info
*thread
)
6609 return get_thread_lwp (thread
)->stopped
;
6612 /* This exposes stop-all-threads functionality to other modules. */
6615 linux_pause_all (int freeze
)
6617 stop_all_lwps (freeze
, NULL
);
6620 /* This exposes unstop-all-threads functionality to other gdbserver
6624 linux_unpause_all (int unfreeze
)
6626 unstop_all_lwps (unfreeze
, NULL
);
6630 linux_prepare_to_access_memory (void)
6632 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6635 linux_pause_all (1);
6640 linux_done_accessing_memory (void)
6642 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6645 linux_unpause_all (1);
6649 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6650 CORE_ADDR collector
,
6653 CORE_ADDR
*jump_entry
,
6654 CORE_ADDR
*trampoline
,
6655 ULONGEST
*trampoline_size
,
6656 unsigned char *jjump_pad_insn
,
6657 ULONGEST
*jjump_pad_insn_size
,
6658 CORE_ADDR
*adjusted_insn_addr
,
6659 CORE_ADDR
*adjusted_insn_addr_end
,
6662 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6663 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6664 jump_entry
, trampoline
, trampoline_size
,
6665 jjump_pad_insn
, jjump_pad_insn_size
,
6666 adjusted_insn_addr
, adjusted_insn_addr_end
,
6670 static struct emit_ops
*
6671 linux_emit_ops (void)
6673 if (the_low_target
.emit_ops
!= NULL
)
6674 return (*the_low_target
.emit_ops
) ();
6680 linux_get_min_fast_tracepoint_insn_len (void)
6682 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6685 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6688 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6689 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6691 char filename
[PATH_MAX
];
6693 const int auxv_size
= is_elf64
6694 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6695 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6697 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6699 fd
= open (filename
, O_RDONLY
);
6705 while (read (fd
, buf
, auxv_size
) == auxv_size
6706 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6710 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6712 switch (aux
->a_type
)
6715 *phdr_memaddr
= aux
->a_un
.a_val
;
6718 *num_phdr
= aux
->a_un
.a_val
;
6724 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6726 switch (aux
->a_type
)
6729 *phdr_memaddr
= aux
->a_un
.a_val
;
6732 *num_phdr
= aux
->a_un
.a_val
;
6740 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6742 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6743 "phdr_memaddr = %ld, phdr_num = %d",
6744 (long) *phdr_memaddr
, *num_phdr
);
6751 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6754 get_dynamic (const int pid
, const int is_elf64
)
6756 CORE_ADDR phdr_memaddr
, relocation
;
6758 unsigned char *phdr_buf
;
6759 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6761 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6764 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6765 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6767 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6770 /* Compute relocation: it is expected to be 0 for "regular" executables,
6771 non-zero for PIE ones. */
6773 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6776 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6778 if (p
->p_type
== PT_PHDR
)
6779 relocation
= phdr_memaddr
- p
->p_vaddr
;
6783 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6785 if (p
->p_type
== PT_PHDR
)
6786 relocation
= phdr_memaddr
- p
->p_vaddr
;
6789 if (relocation
== -1)
6791 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6792 any real world executables, including PIE executables, have always
6793 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6794 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6795 or present DT_DEBUG anyway (fpc binaries are statically linked).
6797 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6799 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6804 for (i
= 0; i
< num_phdr
; i
++)
6808 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6810 if (p
->p_type
== PT_DYNAMIC
)
6811 return p
->p_vaddr
+ relocation
;
6815 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6817 if (p
->p_type
== PT_DYNAMIC
)
6818 return p
->p_vaddr
+ relocation
;
6825 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6826 can be 0 if the inferior does not yet have the library list initialized.
6827 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6828 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6831 get_r_debug (const int pid
, const int is_elf64
)
6833 CORE_ADDR dynamic_memaddr
;
6834 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6835 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6838 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6839 if (dynamic_memaddr
== 0)
6842 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6846 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6847 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6851 unsigned char buf
[sizeof (Elf64_Xword
)];
6855 #ifdef DT_MIPS_RLD_MAP
6856 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6858 if (linux_read_memory (dyn
->d_un
.d_val
,
6859 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6864 #endif /* DT_MIPS_RLD_MAP */
6865 #ifdef DT_MIPS_RLD_MAP_REL
6866 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6868 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6869 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6874 #endif /* DT_MIPS_RLD_MAP_REL */
6876 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6877 map
= dyn
->d_un
.d_val
;
6879 if (dyn
->d_tag
== DT_NULL
)
6884 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6885 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6889 unsigned char buf
[sizeof (Elf32_Word
)];
6893 #ifdef DT_MIPS_RLD_MAP
6894 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6896 if (linux_read_memory (dyn
->d_un
.d_val
,
6897 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6902 #endif /* DT_MIPS_RLD_MAP */
6903 #ifdef DT_MIPS_RLD_MAP_REL
6904 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6906 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6907 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6912 #endif /* DT_MIPS_RLD_MAP_REL */
6914 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6915 map
= dyn
->d_un
.d_val
;
6917 if (dyn
->d_tag
== DT_NULL
)
6921 dynamic_memaddr
+= dyn_size
;
6927 /* Read one pointer from MEMADDR in the inferior. */
6930 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6934 /* Go through a union so this works on either big or little endian
6935 hosts, when the inferior's pointer size is smaller than the size
6936 of CORE_ADDR. It is assumed the inferior's endianness is the
6937 same of the superior's. */
6940 CORE_ADDR core_addr
;
6945 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6948 if (ptr_size
== sizeof (CORE_ADDR
))
6949 *ptr
= addr
.core_addr
;
6950 else if (ptr_size
== sizeof (unsigned int))
6953 gdb_assert_not_reached ("unhandled pointer size");
6958 struct link_map_offsets
6960 /* Offset and size of r_debug.r_version. */
6961 int r_version_offset
;
6963 /* Offset and size of r_debug.r_map. */
6966 /* Offset to l_addr field in struct link_map. */
6969 /* Offset to l_name field in struct link_map. */
6972 /* Offset to l_ld field in struct link_map. */
6975 /* Offset to l_next field in struct link_map. */
6978 /* Offset to l_prev field in struct link_map. */
6982 /* Construct qXfer:libraries-svr4:read reply. */
6985 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
6986 unsigned const char *writebuf
,
6987 CORE_ADDR offset
, int len
)
6990 unsigned document_len
;
6991 struct process_info_private
*const priv
= current_process ()->priv
;
6992 char filename
[PATH_MAX
];
6995 static const struct link_map_offsets lmo_32bit_offsets
=
6997 0, /* r_version offset. */
6998 4, /* r_debug.r_map offset. */
6999 0, /* l_addr offset in link_map. */
7000 4, /* l_name offset in link_map. */
7001 8, /* l_ld offset in link_map. */
7002 12, /* l_next offset in link_map. */
7003 16 /* l_prev offset in link_map. */
7006 static const struct link_map_offsets lmo_64bit_offsets
=
7008 0, /* r_version offset. */
7009 8, /* r_debug.r_map offset. */
7010 0, /* l_addr offset in link_map. */
7011 8, /* l_name offset in link_map. */
7012 16, /* l_ld offset in link_map. */
7013 24, /* l_next offset in link_map. */
7014 32 /* l_prev offset in link_map. */
7016 const struct link_map_offsets
*lmo
;
7017 unsigned int machine
;
7019 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7020 int allocated
= 1024;
7022 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7023 int header_done
= 0;
7025 if (writebuf
!= NULL
)
7027 if (readbuf
== NULL
)
7030 pid
= lwpid_of (current_thread
);
7031 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7032 is_elf64
= elf_64_file_p (filename
, &machine
);
7033 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7034 ptr_size
= is_elf64
? 8 : 4;
7036 while (annex
[0] != '\0')
7042 sep
= strchr (annex
, '=');
7047 if (len
== 5 && startswith (annex
, "start"))
7049 else if (len
== 4 && startswith (annex
, "prev"))
7053 annex
= strchr (sep
, ';');
7060 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7067 if (priv
->r_debug
== 0)
7068 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7070 /* We failed to find DT_DEBUG. Such situation will not change
7071 for this inferior - do not retry it. Report it to GDB as
7072 E01, see for the reasons at the GDB solib-svr4.c side. */
7073 if (priv
->r_debug
== (CORE_ADDR
) -1)
7076 if (priv
->r_debug
!= 0)
7078 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7079 (unsigned char *) &r_version
,
7080 sizeof (r_version
)) != 0
7083 warning ("unexpected r_debug version %d", r_version
);
7085 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7086 &lm_addr
, ptr_size
) != 0)
7088 warning ("unable to read r_map from 0x%lx",
7089 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7094 document
= (char *) xmalloc (allocated
);
7095 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7096 p
= document
+ strlen (document
);
7099 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7100 &l_name
, ptr_size
) == 0
7101 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7102 &l_addr
, ptr_size
) == 0
7103 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7104 &l_ld
, ptr_size
) == 0
7105 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7106 &l_prev
, ptr_size
) == 0
7107 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7108 &l_next
, ptr_size
) == 0)
7110 unsigned char libname
[PATH_MAX
];
7112 if (lm_prev
!= l_prev
)
7114 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7115 (long) lm_prev
, (long) l_prev
);
7119 /* Ignore the first entry even if it has valid name as the first entry
7120 corresponds to the main executable. The first entry should not be
7121 skipped if the dynamic loader was loaded late by a static executable
7122 (see solib-svr4.c parameter ignore_first). But in such case the main
7123 executable does not have PT_DYNAMIC present and this function already
7124 exited above due to failed get_r_debug. */
7127 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7132 /* Not checking for error because reading may stop before
7133 we've got PATH_MAX worth of characters. */
7135 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7136 libname
[sizeof (libname
) - 1] = '\0';
7137 if (libname
[0] != '\0')
7139 /* 6x the size for xml_escape_text below. */
7140 size_t len
= 6 * strlen ((char *) libname
);
7144 /* Terminate `<library-list-svr4'. */
7149 while (allocated
< p
- document
+ len
+ 200)
7151 /* Expand to guarantee sufficient storage. */
7152 uintptr_t document_len
= p
- document
;
7154 document
= (char *) xrealloc (document
, 2 * allocated
);
7156 p
= document
+ document_len
;
7159 std::string name
= xml_escape_text ((char *) libname
);
7160 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7161 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7162 name
.c_str (), (unsigned long) lm_addr
,
7163 (unsigned long) l_addr
, (unsigned long) l_ld
);
7173 /* Empty list; terminate `<library-list-svr4'. */
7177 strcpy (p
, "</library-list-svr4>");
7179 document_len
= strlen (document
);
7180 if (offset
< document_len
)
7181 document_len
-= offset
;
7184 if (len
> document_len
)
7187 memcpy (readbuf
, document
+ offset
, len
);
7193 #ifdef HAVE_LINUX_BTRACE
7195 /* See to_disable_btrace target method. */
7198 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7200 enum btrace_error err
;
7202 err
= linux_disable_btrace (tinfo
);
7203 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7206 /* Encode an Intel Processor Trace configuration. */
7209 linux_low_encode_pt_config (struct buffer
*buffer
,
7210 const struct btrace_data_pt_config
*config
)
7212 buffer_grow_str (buffer
, "<pt-config>\n");
7214 switch (config
->cpu
.vendor
)
7217 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7218 "model=\"%u\" stepping=\"%u\"/>\n",
7219 config
->cpu
.family
, config
->cpu
.model
,
7220 config
->cpu
.stepping
);
7227 buffer_grow_str (buffer
, "</pt-config>\n");
7230 /* Encode a raw buffer. */
7233 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7239 /* We use hex encoding - see common/rsp-low.h. */
7240 buffer_grow_str (buffer
, "<raw>\n");
7246 elem
[0] = tohex ((*data
>> 4) & 0xf);
7247 elem
[1] = tohex (*data
++ & 0xf);
7249 buffer_grow (buffer
, elem
, 2);
7252 buffer_grow_str (buffer
, "</raw>\n");
7255 /* See to_read_btrace target method. */
7258 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7259 enum btrace_read_type type
)
7261 struct btrace_data btrace
;
7262 struct btrace_block
*block
;
7263 enum btrace_error err
;
7266 btrace_data_init (&btrace
);
7268 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7269 if (err
!= BTRACE_ERR_NONE
)
7271 if (err
== BTRACE_ERR_OVERFLOW
)
7272 buffer_grow_str0 (buffer
, "E.Overflow.");
7274 buffer_grow_str0 (buffer
, "E.Generic Error.");
7279 switch (btrace
.format
)
7281 case BTRACE_FORMAT_NONE
:
7282 buffer_grow_str0 (buffer
, "E.No Trace.");
7285 case BTRACE_FORMAT_BTS
:
7286 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7287 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7290 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7292 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7293 paddress (block
->begin
), paddress (block
->end
));
7295 buffer_grow_str0 (buffer
, "</btrace>\n");
7298 case BTRACE_FORMAT_PT
:
7299 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7300 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7301 buffer_grow_str (buffer
, "<pt>\n");
7303 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7305 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7306 btrace
.variant
.pt
.size
);
7308 buffer_grow_str (buffer
, "</pt>\n");
7309 buffer_grow_str0 (buffer
, "</btrace>\n");
7313 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7317 btrace_data_fini (&btrace
);
7321 btrace_data_fini (&btrace
);
7325 /* See to_btrace_conf target method. */
7328 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7329 struct buffer
*buffer
)
7331 const struct btrace_config
*conf
;
7333 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7334 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7336 conf
= linux_btrace_conf (tinfo
);
7339 switch (conf
->format
)
7341 case BTRACE_FORMAT_NONE
:
7344 case BTRACE_FORMAT_BTS
:
7345 buffer_xml_printf (buffer
, "<bts");
7346 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7347 buffer_xml_printf (buffer
, " />\n");
7350 case BTRACE_FORMAT_PT
:
7351 buffer_xml_printf (buffer
, "<pt");
7352 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7353 buffer_xml_printf (buffer
, "/>\n");
7358 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7361 #endif /* HAVE_LINUX_BTRACE */
7363 /* See nat/linux-nat.h. */
7366 current_lwp_ptid (void)
7368 return ptid_of (current_thread
);
7371 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7374 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7376 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7377 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7379 return default_breakpoint_kind_from_pc (pcptr
);
7382 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7384 static const gdb_byte
*
7385 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7387 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7389 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7392 /* Implementation of the target_ops method
7393 "breakpoint_kind_from_current_state". */
7396 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7398 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7399 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7401 return linux_breakpoint_kind_from_pc (pcptr
);
7404 /* Default implementation of linux_target_ops method "set_pc" for
7405 32-bit pc register which is literally named "pc". */
7408 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7410 uint32_t newpc
= pc
;
7412 supply_register_by_name (regcache
, "pc", &newpc
);
7415 /* Default implementation of linux_target_ops method "get_pc" for
7416 32-bit pc register which is literally named "pc". */
7419 linux_get_pc_32bit (struct regcache
*regcache
)
7423 collect_register_by_name (regcache
, "pc", &pc
);
7425 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7429 /* Default implementation of linux_target_ops method "set_pc" for
7430 64-bit pc register which is literally named "pc". */
7433 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7435 uint64_t newpc
= pc
;
7437 supply_register_by_name (regcache
, "pc", &newpc
);
7440 /* Default implementation of linux_target_ops method "get_pc" for
7441 64-bit pc register which is literally named "pc". */
7444 linux_get_pc_64bit (struct regcache
*regcache
)
7448 collect_register_by_name (regcache
, "pc", &pc
);
7450 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7455 static struct target_ops linux_target_ops
= {
7456 linux_create_inferior
,
7457 linux_post_create_inferior
,
7466 linux_fetch_registers
,
7467 linux_store_registers
,
7468 linux_prepare_to_access_memory
,
7469 linux_done_accessing_memory
,
7472 linux_look_up_symbols
,
7473 linux_request_interrupt
,
7475 linux_supports_z_point_type
,
7478 linux_stopped_by_sw_breakpoint
,
7479 linux_supports_stopped_by_sw_breakpoint
,
7480 linux_stopped_by_hw_breakpoint
,
7481 linux_supports_stopped_by_hw_breakpoint
,
7482 linux_supports_hardware_single_step
,
7483 linux_stopped_by_watchpoint
,
7484 linux_stopped_data_address
,
7485 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7486 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7487 && defined(PT_TEXT_END_ADDR)
7492 #ifdef USE_THREAD_DB
7493 thread_db_get_tls_address
,
7498 hostio_last_error_from_errno
,
7501 linux_supports_non_stop
,
7503 linux_start_non_stop
,
7504 linux_supports_multi_process
,
7505 linux_supports_fork_events
,
7506 linux_supports_vfork_events
,
7507 linux_supports_exec_events
,
7508 linux_handle_new_gdb_connection
,
7509 #ifdef USE_THREAD_DB
7510 thread_db_handle_monitor_command
,
7514 linux_common_core_of_thread
,
7516 linux_process_qsupported
,
7517 linux_supports_tracepoints
,
7520 linux_thread_stopped
,
7524 linux_stabilize_threads
,
7525 linux_install_fast_tracepoint_jump_pad
,
7527 linux_supports_disable_randomization
,
7528 linux_get_min_fast_tracepoint_insn_len
,
7529 linux_qxfer_libraries_svr4
,
7530 linux_supports_agent
,
7531 #ifdef HAVE_LINUX_BTRACE
7532 linux_supports_btrace
,
7533 linux_enable_btrace
,
7534 linux_low_disable_btrace
,
7535 linux_low_read_btrace
,
7536 linux_low_btrace_conf
,
7544 linux_supports_range_stepping
,
7545 linux_proc_pid_to_exec_file
,
7546 linux_mntns_open_cloexec
,
7548 linux_mntns_readlink
,
7549 linux_breakpoint_kind_from_pc
,
7550 linux_sw_breakpoint_from_kind
,
7551 linux_proc_tid_get_name
,
7552 linux_breakpoint_kind_from_current_state
,
7553 linux_supports_software_single_step
,
7554 linux_supports_catch_syscall
,
7555 linux_get_ipa_tdesc_idx
,
7557 thread_db_thread_handle
,
7563 #ifdef HAVE_LINUX_REGSETS
7565 initialize_regsets_info (struct regsets_info
*info
)
7567 for (info
->num_regsets
= 0;
7568 info
->regsets
[info
->num_regsets
].size
>= 0;
7569 info
->num_regsets
++)
7575 initialize_low (void)
7577 struct sigaction sigchld_action
;
7579 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7580 set_target_ops (&linux_target_ops
);
7582 linux_ptrace_init_warnings ();
7584 sigchld_action
.sa_handler
= sigchld_handler
;
7585 sigemptyset (&sigchld_action
.sa_mask
);
7586 sigchld_action
.sa_flags
= SA_RESTART
;
7587 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7589 initialize_low_arch ();
7591 linux_check_ptrace_features ();