1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2017 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "linux-low.h"
21 #include "nat/linux-osdata.h"
25 #include "signals-state-save-restore.h"
26 #include "nat/linux-nat.h"
27 #include "nat/linux-waitpid.h"
29 #include "nat/gdb_ptrace.h"
30 #include "nat/linux-ptrace.h"
31 #include "nat/linux-procfs.h"
32 #include "nat/linux-personality.h"
34 #include <sys/ioctl.h>
37 #include <sys/syscall.h>
41 #include <sys/types.h>
46 #include "filestuff.h"
47 #include "tracepoint.h"
50 #include "common-inferior.h"
51 #include "nat/fork-inferior.h"
54 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
55 then ELFMAG0 will have been defined. If it didn't get included by
56 gdb_proc_service.h then including it will likely introduce a duplicate
57 definition of elf_fpregset_t. */
60 #include "nat/linux-namespaces.h"
63 #define SPUFS_MAGIC 0x23c9b64e
66 #ifdef HAVE_PERSONALITY
67 # include <sys/personality.h>
68 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
69 # define ADDR_NO_RANDOMIZE 0x0040000
77 /* Some targets did not define these ptrace constants from the start,
78 so gdbserver defines them locally here. In the future, these may
79 be removed after they are added to asm/ptrace.h. */
80 #if !(defined(PT_TEXT_ADDR) \
81 || defined(PT_DATA_ADDR) \
82 || defined(PT_TEXT_END_ADDR))
83 #if defined(__mcoldfire__)
84 /* These are still undefined in 3.10 kernels. */
85 #define PT_TEXT_ADDR 49*4
86 #define PT_DATA_ADDR 50*4
87 #define PT_TEXT_END_ADDR 51*4
88 /* BFIN already defines these since at least 2.6.32 kernels. */
90 #define PT_TEXT_ADDR 220
91 #define PT_TEXT_END_ADDR 224
92 #define PT_DATA_ADDR 228
93 /* These are still undefined in 3.10 kernels. */
94 #elif defined(__TMS320C6X__)
95 #define PT_TEXT_ADDR (0x10000*4)
96 #define PT_DATA_ADDR (0x10004*4)
97 #define PT_TEXT_END_ADDR (0x10008*4)
101 #ifdef HAVE_LINUX_BTRACE
102 # include "nat/linux-btrace.h"
103 # include "btrace-common.h"
106 #ifndef HAVE_ELF32_AUXV_T
107 /* Copied from glibc's elf.h. */
110 uint32_t a_type
; /* Entry type */
113 uint32_t a_val
; /* Integer value */
114 /* We use to have pointer elements added here. We cannot do that,
115 though, since it does not work when using 32-bit definitions
116 on 64-bit platforms and vice versa. */
121 #ifndef HAVE_ELF64_AUXV_T
122 /* Copied from glibc's elf.h. */
125 uint64_t a_type
; /* Entry type */
128 uint64_t a_val
; /* Integer value */
129 /* We use to have pointer elements added here. We cannot do that,
130 though, since it does not work when using 32-bit definitions
131 on 64-bit platforms and vice versa. */
136 /* Does the current host support PTRACE_GETREGSET? */
137 int have_ptrace_getregset
= -1;
141 /* See nat/linux-nat.h. */
144 ptid_of_lwp (struct lwp_info
*lwp
)
146 return ptid_of (get_lwp_thread (lwp
));
149 /* See nat/linux-nat.h. */
152 lwp_set_arch_private_info (struct lwp_info
*lwp
,
153 struct arch_lwp_info
*info
)
155 lwp
->arch_private
= info
;
158 /* See nat/linux-nat.h. */
160 struct arch_lwp_info
*
161 lwp_arch_private_info (struct lwp_info
*lwp
)
163 return lwp
->arch_private
;
166 /* See nat/linux-nat.h. */
169 lwp_is_stopped (struct lwp_info
*lwp
)
174 /* See nat/linux-nat.h. */
176 enum target_stop_reason
177 lwp_stop_reason (struct lwp_info
*lwp
)
179 return lwp
->stop_reason
;
182 /* See nat/linux-nat.h. */
185 lwp_is_stepping (struct lwp_info
*lwp
)
187 return lwp
->stepping
;
190 /* A list of all unknown processes which receive stop signals. Some
191 other process will presumably claim each of these as forked
192 children momentarily. */
194 struct simple_pid_list
196 /* The process ID. */
199 /* The status as reported by waitpid. */
203 struct simple_pid_list
*next
;
205 struct simple_pid_list
*stopped_pids
;
207 /* Trivial list manipulation functions to keep track of a list of new
208 stopped processes. */
211 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
213 struct simple_pid_list
*new_pid
= XNEW (struct simple_pid_list
);
216 new_pid
->status
= status
;
217 new_pid
->next
= *listp
;
222 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
224 struct simple_pid_list
**p
;
226 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
227 if ((*p
)->pid
== pid
)
229 struct simple_pid_list
*next
= (*p
)->next
;
231 *statusp
= (*p
)->status
;
239 enum stopping_threads_kind
241 /* Not stopping threads presently. */
242 NOT_STOPPING_THREADS
,
244 /* Stopping threads. */
247 /* Stopping and suspending threads. */
248 STOPPING_AND_SUSPENDING_THREADS
251 /* This is set while stop_all_lwps is in effect. */
252 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
254 /* FIXME make into a target method? */
255 int using_threads
= 1;
257 /* True if we're presently stabilizing threads (moving them out of
259 static int stabilizing_threads
;
261 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
262 int step
, int signal
, siginfo_t
*info
);
263 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
264 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
265 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
266 static void unsuspend_all_lwps (struct lwp_info
*except
);
267 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
268 int *wstat
, int options
);
269 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
270 static struct lwp_info
*add_lwp (ptid_t ptid
);
271 static void linux_mourn (struct process_info
*process
);
272 static int linux_stopped_by_watchpoint (void);
273 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
274 static int lwp_is_marked_dead (struct lwp_info
*lwp
);
275 static void proceed_all_lwps (void);
276 static int finish_step_over (struct lwp_info
*lwp
);
277 static int kill_lwp (unsigned long lwpid
, int signo
);
278 static void enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
);
279 static void complete_ongoing_step_over (void);
280 static int linux_low_ptrace_options (int attached
);
281 static int check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
);
282 static int proceed_one_lwp (thread_info
*thread
, void *except
);
284 /* When the event-loop is doing a step-over, this points at the thread
286 ptid_t step_over_bkpt
;
288 /* True if the low target can hardware single-step. */
291 can_hardware_single_step (void)
293 if (the_low_target
.supports_hardware_single_step
!= NULL
)
294 return the_low_target
.supports_hardware_single_step ();
299 /* True if the low target can software single-step. Such targets
300 implement the GET_NEXT_PCS callback. */
303 can_software_single_step (void)
305 return (the_low_target
.get_next_pcs
!= NULL
);
308 /* True if the low target supports memory breakpoints. If so, we'll
309 have a GET_PC implementation. */
312 supports_breakpoints (void)
314 return (the_low_target
.get_pc
!= NULL
);
317 /* Returns true if this target can support fast tracepoints. This
318 does not mean that the in-process agent has been loaded in the
322 supports_fast_tracepoints (void)
324 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
327 /* True if LWP is stopped in its stepping range. */
330 lwp_in_step_range (struct lwp_info
*lwp
)
332 CORE_ADDR pc
= lwp
->stop_pc
;
334 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
337 struct pending_signals
341 struct pending_signals
*prev
;
344 /* The read/write ends of the pipe registered as waitable file in the
346 static int linux_event_pipe
[2] = { -1, -1 };
348 /* True if we're currently in async mode. */
349 #define target_is_async_p() (linux_event_pipe[0] != -1)
351 static void send_sigstop (struct lwp_info
*lwp
);
352 static void wait_for_sigstop (void);
354 /* Return non-zero if HEADER is a 64-bit ELF file. */
357 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
359 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
360 && header
->e_ident
[EI_MAG1
] == ELFMAG1
361 && header
->e_ident
[EI_MAG2
] == ELFMAG2
362 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
364 *machine
= header
->e_machine
;
365 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
372 /* Return non-zero if FILE is a 64-bit ELF file,
373 zero if the file is not a 64-bit ELF file,
374 and -1 if the file is not accessible or doesn't exist. */
377 elf_64_file_p (const char *file
, unsigned int *machine
)
382 fd
= open (file
, O_RDONLY
);
386 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
393 return elf_64_header_p (&header
, machine
);
396 /* Accepts an integer PID; Returns true if the executable PID is
397 running is a 64-bit ELF file.. */
400 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
404 sprintf (file
, "/proc/%d/exe", pid
);
405 return elf_64_file_p (file
, machine
);
409 delete_lwp (struct lwp_info
*lwp
)
411 struct thread_info
*thr
= get_lwp_thread (lwp
);
414 debug_printf ("deleting %ld\n", lwpid_of (thr
));
418 if (the_low_target
.delete_thread
!= NULL
)
419 the_low_target
.delete_thread (lwp
->arch_private
);
421 gdb_assert (lwp
->arch_private
== NULL
);
426 /* Add a process to the common process list, and set its private
429 static struct process_info
*
430 linux_add_process (int pid
, int attached
)
432 struct process_info
*proc
;
434 proc
= add_process (pid
, attached
);
435 proc
->priv
= XCNEW (struct process_info_private
);
437 if (the_low_target
.new_process
!= NULL
)
438 proc
->priv
->arch_private
= the_low_target
.new_process ();
443 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
445 /* Call the target arch_setup function on the current thread. */
448 linux_arch_setup (void)
450 the_low_target
.arch_setup ();
453 /* Call the target arch_setup function on THREAD. */
456 linux_arch_setup_thread (struct thread_info
*thread
)
458 struct thread_info
*saved_thread
;
460 saved_thread
= current_thread
;
461 current_thread
= thread
;
465 current_thread
= saved_thread
;
468 /* Handle a GNU/Linux extended wait response. If we see a clone,
469 fork, or vfork event, we need to add the new LWP to our list
470 (and return 0 so as not to report the trap to higher layers).
471 If we see an exec event, we will modify ORIG_EVENT_LWP to point
472 to a new LWP representing the new program. */
475 handle_extended_wait (struct lwp_info
**orig_event_lwp
, int wstat
)
477 struct lwp_info
*event_lwp
= *orig_event_lwp
;
478 int event
= linux_ptrace_get_extended_event (wstat
);
479 struct thread_info
*event_thr
= get_lwp_thread (event_lwp
);
480 struct lwp_info
*new_lwp
;
482 gdb_assert (event_lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
484 /* All extended events we currently use are mid-syscall. Only
485 PTRACE_EVENT_STOP is delivered more like a signal-stop, but
486 you have to be using PTRACE_SEIZE to get that. */
487 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
489 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
490 || (event
== PTRACE_EVENT_CLONE
))
493 unsigned long new_pid
;
496 /* Get the pid of the new lwp. */
497 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
500 /* If we haven't already seen the new PID stop, wait for it now. */
501 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
503 /* The new child has a pending SIGSTOP. We can't affect it until it
504 hits the SIGSTOP, but we're already attached. */
506 ret
= my_waitpid (new_pid
, &status
, __WALL
);
509 perror_with_name ("waiting for new child");
510 else if (ret
!= new_pid
)
511 warning ("wait returned unexpected PID %d", ret
);
512 else if (!WIFSTOPPED (status
))
513 warning ("wait returned unexpected status 0x%x", status
);
516 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
518 struct process_info
*parent_proc
;
519 struct process_info
*child_proc
;
520 struct lwp_info
*child_lwp
;
521 struct thread_info
*child_thr
;
522 struct target_desc
*tdesc
;
524 ptid
= ptid_build (new_pid
, new_pid
, 0);
528 debug_printf ("HEW: Got fork event from LWP %ld, "
530 ptid_get_lwp (ptid_of (event_thr
)),
531 ptid_get_pid (ptid
));
534 /* Add the new process to the tables and clone the breakpoint
535 lists of the parent. We need to do this even if the new process
536 will be detached, since we will need the process object and the
537 breakpoints to remove any breakpoints from memory when we
538 detach, and the client side will access registers. */
539 child_proc
= linux_add_process (new_pid
, 0);
540 gdb_assert (child_proc
!= NULL
);
541 child_lwp
= add_lwp (ptid
);
542 gdb_assert (child_lwp
!= NULL
);
543 child_lwp
->stopped
= 1;
544 child_lwp
->must_set_ptrace_flags
= 1;
545 child_lwp
->status_pending_p
= 0;
546 child_thr
= get_lwp_thread (child_lwp
);
547 child_thr
->last_resume_kind
= resume_stop
;
548 child_thr
->last_status
.kind
= TARGET_WAITKIND_STOPPED
;
550 /* If we're suspending all threads, leave this one suspended
551 too. If the fork/clone parent is stepping over a breakpoint,
552 all other threads have been suspended already. Leave the
553 child suspended too. */
554 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
555 || event_lwp
->bp_reinsert
!= 0)
558 debug_printf ("HEW: leaving child suspended\n");
559 child_lwp
->suspended
= 1;
562 parent_proc
= get_thread_process (event_thr
);
563 child_proc
->attached
= parent_proc
->attached
;
565 if (event_lwp
->bp_reinsert
!= 0
566 && can_software_single_step ()
567 && event
== PTRACE_EVENT_VFORK
)
569 /* If we leave single-step breakpoints there, child will
570 hit it, so uninsert single-step breakpoints from parent
571 (and child). Once vfork child is done, reinsert
572 them back to parent. */
573 uninsert_single_step_breakpoints (event_thr
);
576 clone_all_breakpoints (child_thr
, event_thr
);
578 tdesc
= allocate_target_description ();
579 copy_target_description (tdesc
, parent_proc
->tdesc
);
580 child_proc
->tdesc
= tdesc
;
582 /* Clone arch-specific process data. */
583 if (the_low_target
.new_fork
!= NULL
)
584 the_low_target
.new_fork (parent_proc
, child_proc
);
586 /* Save fork info in the parent thread. */
587 if (event
== PTRACE_EVENT_FORK
)
588 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
589 else if (event
== PTRACE_EVENT_VFORK
)
590 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
592 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
594 /* The status_pending field contains bits denoting the
595 extended event, so when the pending event is handled,
596 the handler will look at lwp->waitstatus. */
597 event_lwp
->status_pending_p
= 1;
598 event_lwp
->status_pending
= wstat
;
600 /* Link the threads until the parent event is passed on to
602 event_lwp
->fork_relative
= child_lwp
;
603 child_lwp
->fork_relative
= event_lwp
;
605 /* If the parent thread is doing step-over with single-step
606 breakpoints, the list of single-step breakpoints are cloned
607 from the parent's. Remove them from the child process.
608 In case of vfork, we'll reinsert them back once vforked
610 if (event_lwp
->bp_reinsert
!= 0
611 && can_software_single_step ())
613 /* The child process is forked and stopped, so it is safe
614 to access its memory without stopping all other threads
615 from other processes. */
616 delete_single_step_breakpoints (child_thr
);
618 gdb_assert (has_single_step_breakpoints (event_thr
));
619 gdb_assert (!has_single_step_breakpoints (child_thr
));
622 /* Report the event. */
627 debug_printf ("HEW: Got clone event "
628 "from LWP %ld, new child is LWP %ld\n",
629 lwpid_of (event_thr
), new_pid
);
631 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
632 new_lwp
= add_lwp (ptid
);
634 /* Either we're going to immediately resume the new thread
635 or leave it stopped. linux_resume_one_lwp is a nop if it
636 thinks the thread is currently running, so set this first
637 before calling linux_resume_one_lwp. */
638 new_lwp
->stopped
= 1;
640 /* If we're suspending all threads, leave this one suspended
641 too. If the fork/clone parent is stepping over a breakpoint,
642 all other threads have been suspended already. Leave the
643 child suspended too. */
644 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
645 || event_lwp
->bp_reinsert
!= 0)
646 new_lwp
->suspended
= 1;
648 /* Normally we will get the pending SIGSTOP. But in some cases
649 we might get another signal delivered to the group first.
650 If we do get another signal, be sure not to lose it. */
651 if (WSTOPSIG (status
) != SIGSTOP
)
653 new_lwp
->stop_expected
= 1;
654 new_lwp
->status_pending_p
= 1;
655 new_lwp
->status_pending
= status
;
657 else if (report_thread_events
)
659 new_lwp
->waitstatus
.kind
= TARGET_WAITKIND_THREAD_CREATED
;
660 new_lwp
->status_pending_p
= 1;
661 new_lwp
->status_pending
= status
;
664 thread_db_notice_clone (event_thr
, ptid
);
666 /* Don't report the event. */
669 else if (event
== PTRACE_EVENT_VFORK_DONE
)
671 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
673 if (event_lwp
->bp_reinsert
!= 0 && can_software_single_step ())
675 reinsert_single_step_breakpoints (event_thr
);
677 gdb_assert (has_single_step_breakpoints (event_thr
));
680 /* Report the event. */
683 else if (event
== PTRACE_EVENT_EXEC
&& report_exec_events
)
685 struct process_info
*proc
;
686 std::vector
<int> syscalls_to_catch
;
692 debug_printf ("HEW: Got exec event from LWP %ld\n",
693 lwpid_of (event_thr
));
696 /* Get the event ptid. */
697 event_ptid
= ptid_of (event_thr
);
698 event_pid
= ptid_get_pid (event_ptid
);
700 /* Save the syscall list from the execing process. */
701 proc
= get_thread_process (event_thr
);
702 syscalls_to_catch
= std::move (proc
->syscalls_to_catch
);
704 /* Delete the execing process and all its threads. */
706 current_thread
= NULL
;
708 /* Create a new process/lwp/thread. */
709 proc
= linux_add_process (event_pid
, 0);
710 event_lwp
= add_lwp (event_ptid
);
711 event_thr
= get_lwp_thread (event_lwp
);
712 gdb_assert (current_thread
== event_thr
);
713 linux_arch_setup_thread (event_thr
);
715 /* Set the event status. */
716 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
717 event_lwp
->waitstatus
.value
.execd_pathname
718 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
720 /* Mark the exec status as pending. */
721 event_lwp
->stopped
= 1;
722 event_lwp
->status_pending_p
= 1;
723 event_lwp
->status_pending
= wstat
;
724 event_thr
->last_resume_kind
= resume_continue
;
725 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
727 /* Update syscall state in the new lwp, effectively mid-syscall too. */
728 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
730 /* Restore the list to catch. Don't rely on the client, which is free
731 to avoid sending a new list when the architecture doesn't change.
732 Also, for ANY_SYSCALL, the architecture doesn't really matter. */
733 proc
->syscalls_to_catch
= std::move (syscalls_to_catch
);
735 /* Report the event. */
736 *orig_event_lwp
= event_lwp
;
740 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
743 /* Return the PC as read from the regcache of LWP, without any
747 get_pc (struct lwp_info
*lwp
)
749 struct thread_info
*saved_thread
;
750 struct regcache
*regcache
;
753 if (the_low_target
.get_pc
== NULL
)
756 saved_thread
= current_thread
;
757 current_thread
= get_lwp_thread (lwp
);
759 regcache
= get_thread_regcache (current_thread
, 1);
760 pc
= (*the_low_target
.get_pc
) (regcache
);
763 debug_printf ("pc is 0x%lx\n", (long) pc
);
765 current_thread
= saved_thread
;
769 /* This function should only be called if LWP got a SYSCALL_SIGTRAP.
770 Fill *SYSNO with the syscall nr trapped. */
773 get_syscall_trapinfo (struct lwp_info
*lwp
, int *sysno
)
775 struct thread_info
*saved_thread
;
776 struct regcache
*regcache
;
778 if (the_low_target
.get_syscall_trapinfo
== NULL
)
780 /* If we cannot get the syscall trapinfo, report an unknown
781 system call number. */
782 *sysno
= UNKNOWN_SYSCALL
;
786 saved_thread
= current_thread
;
787 current_thread
= get_lwp_thread (lwp
);
789 regcache
= get_thread_regcache (current_thread
, 1);
790 (*the_low_target
.get_syscall_trapinfo
) (regcache
, sysno
);
793 debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno
);
795 current_thread
= saved_thread
;
798 static int check_stopped_by_watchpoint (struct lwp_info
*child
);
800 /* Called when the LWP stopped for a signal/trap. If it stopped for a
801 trap check what caused it (breakpoint, watchpoint, trace, etc.),
802 and save the result in the LWP's stop_reason field. If it stopped
803 for a breakpoint, decrement the PC if necessary on the lwp's
804 architecture. Returns true if we now have the LWP's stop PC. */
807 save_stop_reason (struct lwp_info
*lwp
)
810 CORE_ADDR sw_breakpoint_pc
;
811 struct thread_info
*saved_thread
;
812 #if USE_SIGTRAP_SIGINFO
816 if (the_low_target
.get_pc
== NULL
)
820 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
822 /* breakpoint_at reads from the current thread. */
823 saved_thread
= current_thread
;
824 current_thread
= get_lwp_thread (lwp
);
826 #if USE_SIGTRAP_SIGINFO
827 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
828 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
830 if (siginfo
.si_signo
== SIGTRAP
)
832 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
)
833 && GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
835 /* The si_code is ambiguous on this arch -- check debug
837 if (!check_stopped_by_watchpoint (lwp
))
838 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
840 else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
842 /* If we determine the LWP stopped for a SW breakpoint,
843 trust it. Particularly don't check watchpoint
844 registers, because at least on s390, we'd find
845 stopped-by-watchpoint as long as there's a watchpoint
847 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
849 else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
851 /* This can indicate either a hardware breakpoint or
852 hardware watchpoint. Check debug registers. */
853 if (!check_stopped_by_watchpoint (lwp
))
854 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
856 else if (siginfo
.si_code
== TRAP_TRACE
)
858 /* We may have single stepped an instruction that
859 triggered a watchpoint. In that case, on some
860 architectures (such as x86), instead of TRAP_HWBKPT,
861 si_code indicates TRAP_TRACE, and we need to check
862 the debug registers separately. */
863 if (!check_stopped_by_watchpoint (lwp
))
864 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
869 /* We may have just stepped a breakpoint instruction. E.g., in
870 non-stop mode, GDB first tells the thread A to step a range, and
871 then the user inserts a breakpoint inside the range. In that
872 case we need to report the breakpoint PC. */
873 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
874 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
875 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
877 if (hardware_breakpoint_inserted_here (pc
))
878 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
880 if (lwp
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
)
881 check_stopped_by_watchpoint (lwp
);
884 if (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
888 struct thread_info
*thr
= get_lwp_thread (lwp
);
890 debug_printf ("CSBB: %s stopped by software breakpoint\n",
891 target_pid_to_str (ptid_of (thr
)));
894 /* Back up the PC if necessary. */
895 if (pc
!= sw_breakpoint_pc
)
897 struct regcache
*regcache
898 = get_thread_regcache (current_thread
, 1);
899 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
902 /* Update this so we record the correct stop PC below. */
903 pc
= sw_breakpoint_pc
;
905 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
)
909 struct thread_info
*thr
= get_lwp_thread (lwp
);
911 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
912 target_pid_to_str (ptid_of (thr
)));
915 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
919 struct thread_info
*thr
= get_lwp_thread (lwp
);
921 debug_printf ("CSBB: %s stopped by hardware watchpoint\n",
922 target_pid_to_str (ptid_of (thr
)));
925 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
)
929 struct thread_info
*thr
= get_lwp_thread (lwp
);
931 debug_printf ("CSBB: %s stopped by trace\n",
932 target_pid_to_str (ptid_of (thr
)));
937 current_thread
= saved_thread
;
941 static struct lwp_info
*
942 add_lwp (ptid_t ptid
)
944 struct lwp_info
*lwp
;
946 lwp
= XCNEW (struct lwp_info
);
948 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
950 if (the_low_target
.new_thread
!= NULL
)
951 the_low_target
.new_thread (lwp
);
953 lwp
->thread
= add_thread (ptid
, lwp
);
958 /* Callback to be used when calling fork_inferior, responsible for
959 actually initiating the tracing of the inferior. */
964 if (ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0,
965 (PTRACE_TYPE_ARG4
) 0) < 0)
966 trace_start_error_with_name ("ptrace");
968 if (setpgid (0, 0) < 0)
969 trace_start_error_with_name ("setpgid");
971 /* If GDBserver is connected to gdb via stdio, redirect the inferior's
972 stdout to stderr so that inferior i/o doesn't corrupt the connection.
973 Also, redirect stdin to /dev/null. */
974 if (remote_connection_is_stdio ())
977 trace_start_error_with_name ("close");
978 if (open ("/dev/null", O_RDONLY
) < 0)
979 trace_start_error_with_name ("open");
981 trace_start_error_with_name ("dup2");
982 if (write (2, "stdin/stdout redirected\n",
983 sizeof ("stdin/stdout redirected\n") - 1) < 0)
985 /* Errors ignored. */;
990 /* Start an inferior process and returns its pid.
991 PROGRAM is the name of the program to be started, and PROGRAM_ARGS
992 are its arguments. */
995 linux_create_inferior (const char *program
,
996 const std::vector
<char *> &program_args
)
998 struct lwp_info
*new_lwp
;
1003 maybe_disable_address_space_randomization restore_personality
1004 (disable_randomization
);
1005 std::string str_program_args
= stringify_argv (program_args
);
1007 pid
= fork_inferior (program
,
1008 str_program_args
.c_str (),
1009 get_environ ()->envp (), linux_ptrace_fun
,
1010 NULL
, NULL
, NULL
, NULL
);
1013 linux_add_process (pid
, 0);
1015 ptid
= ptid_build (pid
, pid
, 0);
1016 new_lwp
= add_lwp (ptid
);
1017 new_lwp
->must_set_ptrace_flags
= 1;
1019 post_fork_inferior (pid
, program
);
1024 /* Implement the post_create_inferior target_ops method. */
1027 linux_post_create_inferior (void)
1029 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
1031 linux_arch_setup ();
1033 if (lwp
->must_set_ptrace_flags
)
1035 struct process_info
*proc
= current_process ();
1036 int options
= linux_low_ptrace_options (proc
->attached
);
1038 linux_enable_event_reporting (lwpid_of (current_thread
), options
);
1039 lwp
->must_set_ptrace_flags
= 0;
1043 /* Attach to an inferior process. Returns 0 on success, ERRNO on
1047 linux_attach_lwp (ptid_t ptid
)
1049 struct lwp_info
*new_lwp
;
1050 int lwpid
= ptid_get_lwp (ptid
);
1052 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
1056 new_lwp
= add_lwp (ptid
);
1058 /* We need to wait for SIGSTOP before being able to make the next
1059 ptrace call on this LWP. */
1060 new_lwp
->must_set_ptrace_flags
= 1;
1062 if (linux_proc_pid_is_stopped (lwpid
))
1065 debug_printf ("Attached to a stopped process\n");
1067 /* The process is definitely stopped. It is in a job control
1068 stop, unless the kernel predates the TASK_STOPPED /
1069 TASK_TRACED distinction, in which case it might be in a
1070 ptrace stop. Make sure it is in a ptrace stop; from there we
1071 can kill it, signal it, et cetera.
1073 First make sure there is a pending SIGSTOP. Since we are
1074 already attached, the process can not transition from stopped
1075 to running without a PTRACE_CONT; so we know this signal will
1076 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1077 probably already in the queue (unless this kernel is old
1078 enough to use TASK_STOPPED for ptrace stops); but since
1079 SIGSTOP is not an RT signal, it can only be queued once. */
1080 kill_lwp (lwpid
, SIGSTOP
);
1082 /* Finally, resume the stopped process. This will deliver the
1083 SIGSTOP (or a higher priority signal, just like normal
1084 PTRACE_ATTACH), which we'll catch later on. */
1085 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1088 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
1089 brings it to a halt.
1091 There are several cases to consider here:
1093 1) gdbserver has already attached to the process and is being notified
1094 of a new thread that is being created.
1095 In this case we should ignore that SIGSTOP and resume the
1096 process. This is handled below by setting stop_expected = 1,
1097 and the fact that add_thread sets last_resume_kind ==
1100 2) This is the first thread (the process thread), and we're attaching
1101 to it via attach_inferior.
1102 In this case we want the process thread to stop.
1103 This is handled by having linux_attach set last_resume_kind ==
1104 resume_stop after we return.
1106 If the pid we are attaching to is also the tgid, we attach to and
1107 stop all the existing threads. Otherwise, we attach to pid and
1108 ignore any other threads in the same group as this pid.
1110 3) GDB is connecting to gdbserver and is requesting an enumeration of all
1112 In this case we want the thread to stop.
1113 FIXME: This case is currently not properly handled.
1114 We should wait for the SIGSTOP but don't. Things work apparently
1115 because enough time passes between when we ptrace (ATTACH) and when
1116 gdb makes the next ptrace call on the thread.
1118 On the other hand, if we are currently trying to stop all threads, we
1119 should treat the new thread as if we had sent it a SIGSTOP. This works
1120 because we are guaranteed that the add_lwp call above added us to the
1121 end of the list, and so the new thread has not yet reached
1122 wait_for_sigstop (but will). */
1123 new_lwp
->stop_expected
= 1;
1128 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
1129 already attached. Returns true if a new LWP is found, false
1133 attach_proc_task_lwp_callback (ptid_t ptid
)
1135 /* Is this a new thread? */
1136 if (find_thread_ptid (ptid
) == NULL
)
1138 int lwpid
= ptid_get_lwp (ptid
);
1142 debug_printf ("Found new lwp %d\n", lwpid
);
1144 err
= linux_attach_lwp (ptid
);
1146 /* Be quiet if we simply raced with the thread exiting. EPERM
1147 is returned if the thread's task still exists, and is marked
1148 as exited or zombie, as well as other conditions, so in that
1149 case, confirm the status in /proc/PID/status. */
1151 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1155 debug_printf ("Cannot attach to lwp %d: "
1156 "thread is gone (%d: %s)\n",
1157 lwpid
, err
, strerror (err
));
1162 warning (_("Cannot attach to lwp %d: %s"),
1164 linux_ptrace_attach_fail_reason_string (ptid
, err
));
1172 static void async_file_mark (void);
1174 /* Attach to PID. If PID is the tgid, attach to it and all
1178 linux_attach (unsigned long pid
)
1180 struct process_info
*proc
;
1181 struct thread_info
*initial_thread
;
1182 ptid_t ptid
= ptid_build (pid
, pid
, 0);
1185 /* Attach to PID. We will check for other threads
1187 err
= linux_attach_lwp (ptid
);
1189 error ("Cannot attach to process %ld: %s",
1190 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
1192 proc
= linux_add_process (pid
, 1);
1194 /* Don't ignore the initial SIGSTOP if we just attached to this
1195 process. It will be collected by wait shortly. */
1196 initial_thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
1197 initial_thread
->last_resume_kind
= resume_stop
;
1199 /* We must attach to every LWP. If /proc is mounted, use that to
1200 find them now. On the one hand, the inferior may be using raw
1201 clone instead of using pthreads. On the other hand, even if it
1202 is using pthreads, GDB may not be connected yet (thread_db needs
1203 to do symbol lookups, through qSymbol). Also, thread_db walks
1204 structures in the inferior's address space to find the list of
1205 threads/LWPs, and those structures may well be corrupted. Note
1206 that once thread_db is loaded, we'll still use it to list threads
1207 and associate pthread info with each LWP. */
1208 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1210 /* GDB will shortly read the xml target description for this
1211 process, to figure out the process' architecture. But the target
1212 description is only filled in when the first process/thread in
1213 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1214 that now, otherwise, if GDB is fast enough, it could read the
1215 target description _before_ that initial stop. */
1218 struct lwp_info
*lwp
;
1220 ptid_t pid_ptid
= pid_to_ptid (pid
);
1222 lwpid
= linux_wait_for_event_filtered (pid_ptid
, pid_ptid
,
1224 gdb_assert (lwpid
> 0);
1226 lwp
= find_lwp_pid (pid_to_ptid (lwpid
));
1228 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGSTOP
)
1230 lwp
->status_pending_p
= 1;
1231 lwp
->status_pending
= wstat
;
1234 initial_thread
->last_resume_kind
= resume_continue
;
1238 gdb_assert (proc
->tdesc
!= NULL
);
1251 second_thread_of_pid_p (thread_info
*thread
, void *args
)
1253 struct counter
*counter
= (struct counter
*) args
;
1255 if (thread
->id
.pid () == counter
->pid
)
1257 if (++counter
->count
> 1)
1265 last_thread_of_process_p (int pid
)
1267 struct counter counter
= { pid
, 0 };
1269 return (find_inferior (&all_threads
,
1270 second_thread_of_pid_p
, &counter
) == NULL
);
1276 linux_kill_one_lwp (struct lwp_info
*lwp
)
1278 struct thread_info
*thr
= get_lwp_thread (lwp
);
1279 int pid
= lwpid_of (thr
);
1281 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1282 there is no signal context, and ptrace(PTRACE_KILL) (or
1283 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1284 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1285 alternative is to kill with SIGKILL. We only need one SIGKILL
1286 per process, not one for each thread. But since we still support
1287 support debugging programs using raw clone without CLONE_THREAD,
1288 we send one for each thread. For years, we used PTRACE_KILL
1289 only, so we're being a bit paranoid about some old kernels where
1290 PTRACE_KILL might work better (dubious if there are any such, but
1291 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1292 second, and so we're fine everywhere. */
1295 kill_lwp (pid
, SIGKILL
);
1298 int save_errno
= errno
;
1300 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1301 target_pid_to_str (ptid_of (thr
)),
1302 save_errno
? strerror (save_errno
) : "OK");
1306 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1309 int save_errno
= errno
;
1311 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1312 target_pid_to_str (ptid_of (thr
)),
1313 save_errno
? strerror (save_errno
) : "OK");
1317 /* Kill LWP and wait for it to die. */
1320 kill_wait_lwp (struct lwp_info
*lwp
)
1322 struct thread_info
*thr
= get_lwp_thread (lwp
);
1323 int pid
= ptid_get_pid (ptid_of (thr
));
1324 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1329 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1333 linux_kill_one_lwp (lwp
);
1335 /* Make sure it died. Notes:
1337 - The loop is most likely unnecessary.
1339 - We don't use linux_wait_for_event as that could delete lwps
1340 while we're iterating over them. We're not interested in
1341 any pending status at this point, only in making sure all
1342 wait status on the kernel side are collected until the
1345 - We don't use __WALL here as the __WALL emulation relies on
1346 SIGCHLD, and killing a stopped process doesn't generate
1347 one, nor an exit status.
1349 res
= my_waitpid (lwpid
, &wstat
, 0);
1350 if (res
== -1 && errno
== ECHILD
)
1351 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1352 } while (res
> 0 && WIFSTOPPED (wstat
));
1354 /* Even if it was stopped, the child may have already disappeared.
1355 E.g., if it was killed by SIGKILL. */
1356 if (res
< 0 && errno
!= ECHILD
)
1357 perror_with_name ("kill_wait_lwp");
1360 /* Callback for `for_each_thread'. Kills an lwp of a given process,
1361 except the leader. */
1364 kill_one_lwp_callback (thread_info
*thread
, int pid
)
1366 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1368 /* We avoid killing the first thread here, because of a Linux kernel (at
1369 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1370 the children get a chance to be reaped, it will remain a zombie
1373 if (lwpid_of (thread
) == pid
)
1376 debug_printf ("lkop: is last of process %s\n",
1377 target_pid_to_str (thread
->id
));
1381 kill_wait_lwp (lwp
);
1385 linux_kill (int pid
)
1387 struct process_info
*process
;
1388 struct lwp_info
*lwp
;
1390 process
= find_process_pid (pid
);
1391 if (process
== NULL
)
1394 /* If we're killing a running inferior, make sure it is stopped
1395 first, as PTRACE_KILL will not work otherwise. */
1396 stop_all_lwps (0, NULL
);
1398 for_each_thread (pid
, [&] (thread_info
*thread
)
1400 kill_one_lwp_callback (thread
, pid
);
1403 /* See the comment in linux_kill_one_lwp. We did not kill the first
1404 thread in the list, so do so now. */
1405 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1410 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1414 kill_wait_lwp (lwp
);
1416 the_target
->mourn (process
);
1418 /* Since we presently can only stop all lwps of all processes, we
1419 need to unstop lwps of other processes. */
1420 unstop_all_lwps (0, NULL
);
1424 /* Get pending signal of THREAD, for detaching purposes. This is the
1425 signal the thread last stopped for, which we need to deliver to the
1426 thread when detaching, otherwise, it'd be suppressed/lost. */
1429 get_detach_signal (struct thread_info
*thread
)
1431 enum gdb_signal signo
= GDB_SIGNAL_0
;
1433 struct lwp_info
*lp
= get_thread_lwp (thread
);
1435 if (lp
->status_pending_p
)
1436 status
= lp
->status_pending
;
1439 /* If the thread had been suspended by gdbserver, and it stopped
1440 cleanly, then it'll have stopped with SIGSTOP. But we don't
1441 want to deliver that SIGSTOP. */
1442 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1443 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1446 /* Otherwise, we may need to deliver the signal we
1448 status
= lp
->last_status
;
1451 if (!WIFSTOPPED (status
))
1454 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1455 target_pid_to_str (ptid_of (thread
)));
1459 /* Extended wait statuses aren't real SIGTRAPs. */
1460 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1463 debug_printf ("GPS: lwp %s had stopped with extended "
1464 "status: no pending signal\n",
1465 target_pid_to_str (ptid_of (thread
)));
1469 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1471 if (program_signals_p
&& !program_signals
[signo
])
1474 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1475 target_pid_to_str (ptid_of (thread
)),
1476 gdb_signal_to_string (signo
));
1479 else if (!program_signals_p
1480 /* If we have no way to know which signals GDB does not
1481 want to have passed to the program, assume
1482 SIGTRAP/SIGINT, which is GDB's default. */
1483 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1486 debug_printf ("GPS: lwp %s had signal %s, "
1487 "but we don't know if we should pass it. "
1488 "Default to not.\n",
1489 target_pid_to_str (ptid_of (thread
)),
1490 gdb_signal_to_string (signo
));
1496 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1497 target_pid_to_str (ptid_of (thread
)),
1498 gdb_signal_to_string (signo
));
1500 return WSTOPSIG (status
);
1504 /* Detach from LWP. */
1507 linux_detach_one_lwp (struct lwp_info
*lwp
)
1509 struct thread_info
*thread
= get_lwp_thread (lwp
);
1513 /* If there is a pending SIGSTOP, get rid of it. */
1514 if (lwp
->stop_expected
)
1517 debug_printf ("Sending SIGCONT to %s\n",
1518 target_pid_to_str (ptid_of (thread
)));
1520 kill_lwp (lwpid_of (thread
), SIGCONT
);
1521 lwp
->stop_expected
= 0;
1524 /* Pass on any pending signal for this thread. */
1525 sig
= get_detach_signal (thread
);
1527 /* Preparing to resume may try to write registers, and fail if the
1528 lwp is zombie. If that happens, ignore the error. We'll handle
1529 it below, when detach fails with ESRCH. */
1532 /* Flush any pending changes to the process's registers. */
1533 regcache_invalidate_thread (thread
);
1535 /* Finally, let it resume. */
1536 if (the_low_target
.prepare_to_resume
!= NULL
)
1537 the_low_target
.prepare_to_resume (lwp
);
1539 CATCH (ex
, RETURN_MASK_ERROR
)
1541 if (!check_ptrace_stopped_lwp_gone (lwp
))
1542 throw_exception (ex
);
1546 lwpid
= lwpid_of (thread
);
1547 if (ptrace (PTRACE_DETACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0,
1548 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1550 int save_errno
= errno
;
1552 /* We know the thread exists, so ESRCH must mean the lwp is
1553 zombie. This can happen if one of the already-detached
1554 threads exits the whole thread group. In that case we're
1555 still attached, and must reap the lwp. */
1556 if (save_errno
== ESRCH
)
1560 ret
= my_waitpid (lwpid
, &status
, __WALL
);
1563 warning (_("Couldn't reap LWP %d while detaching: %s"),
1564 lwpid
, strerror (errno
));
1566 else if (!WIFEXITED (status
) && !WIFSIGNALED (status
))
1568 warning (_("Reaping LWP %d while detaching "
1569 "returned unexpected status 0x%x"),
1575 error (_("Can't detach %s: %s"),
1576 target_pid_to_str (ptid_of (thread
)),
1577 strerror (save_errno
));
1580 else if (debug_threads
)
1582 debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n",
1583 target_pid_to_str (ptid_of (thread
)),
1590 /* Callback for find_inferior. Detaches from non-leader threads of a
1594 linux_detach_lwp_callback (thread_info
*thread
, void *args
)
1596 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1597 int pid
= *(int *) args
;
1598 int lwpid
= lwpid_of (thread
);
1600 /* Skip other processes. */
1601 if (thread
->id
.pid () != pid
)
1604 /* We don't actually detach from the thread group leader just yet.
1605 If the thread group exits, we must reap the zombie clone lwps
1606 before we're able to reap the leader. */
1607 if (thread
->id
.pid () == lwpid
)
1610 linux_detach_one_lwp (lwp
);
1615 linux_detach (int pid
)
1617 struct process_info
*process
;
1618 struct lwp_info
*main_lwp
;
1620 process
= find_process_pid (pid
);
1621 if (process
== NULL
)
1624 /* As there's a step over already in progress, let it finish first,
1625 otherwise nesting a stabilize_threads operation on top gets real
1627 complete_ongoing_step_over ();
1629 /* Stop all threads before detaching. First, ptrace requires that
1630 the thread is stopped to sucessfully detach. Second, thread_db
1631 may need to uninstall thread event breakpoints from memory, which
1632 only works with a stopped process anyway. */
1633 stop_all_lwps (0, NULL
);
1635 #ifdef USE_THREAD_DB
1636 thread_db_detach (process
);
1639 /* Stabilize threads (move out of jump pads). */
1640 stabilize_threads ();
1642 /* Detach from the clone lwps first. If the thread group exits just
1643 while we're detaching, we must reap the clone lwps before we're
1644 able to reap the leader. */
1645 find_inferior (&all_threads
, linux_detach_lwp_callback
, &pid
);
1647 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1648 linux_detach_one_lwp (main_lwp
);
1650 the_target
->mourn (process
);
1652 /* Since we presently can only stop all lwps of all processes, we
1653 need to unstop lwps of other processes. */
1654 unstop_all_lwps (0, NULL
);
1658 /* Remove all LWPs that belong to process PROC from the lwp list. */
1661 delete_lwp_callback (thread_info
*thread
, void *proc
)
1663 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1664 struct process_info
*process
= (struct process_info
*) proc
;
1666 if (pid_of (thread
) == pid_of (process
))
1673 linux_mourn (struct process_info
*process
)
1675 struct process_info_private
*priv
;
1677 #ifdef USE_THREAD_DB
1678 thread_db_mourn (process
);
1681 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1683 /* Freeing all private data. */
1684 priv
= process
->priv
;
1685 if (the_low_target
.delete_process
!= NULL
)
1686 the_low_target
.delete_process (priv
->arch_private
);
1688 gdb_assert (priv
->arch_private
== NULL
);
1690 process
->priv
= NULL
;
1692 remove_process (process
);
1696 linux_join (int pid
)
1701 ret
= my_waitpid (pid
, &status
, 0);
1702 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1704 } while (ret
!= -1 || errno
!= ECHILD
);
1707 /* Return nonzero if the given thread is still alive. */
1709 linux_thread_alive (ptid_t ptid
)
1711 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1713 /* We assume we always know if a thread exits. If a whole process
1714 exited but we still haven't been able to report it to GDB, we'll
1715 hold on to the last lwp of the dead process. */
1717 return !lwp_is_marked_dead (lwp
);
1722 /* Return 1 if this lwp still has an interesting status pending. If
1723 not (e.g., it had stopped for a breakpoint that is gone), return
1727 thread_still_has_status_pending_p (struct thread_info
*thread
)
1729 struct lwp_info
*lp
= get_thread_lwp (thread
);
1731 if (!lp
->status_pending_p
)
1734 if (thread
->last_resume_kind
!= resume_stop
1735 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1736 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1738 struct thread_info
*saved_thread
;
1742 gdb_assert (lp
->last_status
!= 0);
1746 saved_thread
= current_thread
;
1747 current_thread
= thread
;
1749 if (pc
!= lp
->stop_pc
)
1752 debug_printf ("PC of %ld changed\n",
1757 #if !USE_SIGTRAP_SIGINFO
1758 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1759 && !(*the_low_target
.breakpoint_at
) (pc
))
1762 debug_printf ("previous SW breakpoint of %ld gone\n",
1766 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1767 && !hardware_breakpoint_inserted_here (pc
))
1770 debug_printf ("previous HW breakpoint of %ld gone\n",
1776 current_thread
= saved_thread
;
1781 debug_printf ("discarding pending breakpoint status\n");
1782 lp
->status_pending_p
= 0;
1790 /* Returns true if LWP is resumed from the client's perspective. */
1793 lwp_resumed (struct lwp_info
*lwp
)
1795 struct thread_info
*thread
= get_lwp_thread (lwp
);
1797 if (thread
->last_resume_kind
!= resume_stop
)
1800 /* Did gdb send us a `vCont;t', but we haven't reported the
1801 corresponding stop to gdb yet? If so, the thread is still
1802 resumed/running from gdb's perspective. */
1803 if (thread
->last_resume_kind
== resume_stop
1804 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1810 /* Return true if this lwp has an interesting status pending. */
1812 status_pending_p_callback (thread_info
*thread
, ptid_t ptid
)
1814 struct lwp_info
*lp
= get_thread_lwp (thread
);
1816 /* Check if we're only interested in events from a specific process
1817 or a specific LWP. */
1818 if (!thread
->id
.matches (ptid
))
1821 if (!lwp_resumed (lp
))
1824 if (lp
->status_pending_p
1825 && !thread_still_has_status_pending_p (thread
))
1827 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1831 return lp
->status_pending_p
;
1835 same_lwp (thread_info
*thread
, void *data
)
1837 ptid_t ptid
= *(ptid_t
*) data
;
1840 if (ptid_get_lwp (ptid
) != 0)
1841 lwp
= ptid_get_lwp (ptid
);
1843 lwp
= ptid_get_pid (ptid
);
1845 if (thread
->id
.lwp () == lwp
)
1852 find_lwp_pid (ptid_t ptid
)
1854 thread_info
*thread
= find_inferior (&all_threads
, same_lwp
, &ptid
);
1859 return get_thread_lwp (thread
);
1862 /* Return the number of known LWPs in the tgid given by PID. */
1869 for_each_thread (pid
, [&] (thread_info
*thread
)
1877 /* See nat/linux-nat.h. */
1880 iterate_over_lwps (ptid_t filter
,
1881 iterate_over_lwps_ftype callback
,
1884 thread_info
*thread
= find_thread (filter
, [&] (thread_info
*thread
)
1886 lwp_info
*lwp
= get_thread_lwp (thread
);
1888 return callback (lwp
, data
);
1894 return get_thread_lwp (thread
);
1897 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1898 their exits until all other threads in the group have exited. */
1901 check_zombie_leaders (void)
1903 for_each_process ([] (process_info
*proc
) {
1904 pid_t leader_pid
= pid_of (proc
);
1905 struct lwp_info
*leader_lp
;
1907 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1910 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1911 "num_lwps=%d, zombie=%d\n",
1912 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1913 linux_proc_pid_is_zombie (leader_pid
));
1915 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1916 /* Check if there are other threads in the group, as we may
1917 have raced with the inferior simply exiting. */
1918 && !last_thread_of_process_p (leader_pid
)
1919 && linux_proc_pid_is_zombie (leader_pid
))
1921 /* A leader zombie can mean one of two things:
1923 - It exited, and there's an exit status pending
1924 available, or only the leader exited (not the whole
1925 program). In the latter case, we can't waitpid the
1926 leader's exit status until all other threads are gone.
1928 - There are 3 or more threads in the group, and a thread
1929 other than the leader exec'd. On an exec, the Linux
1930 kernel destroys all other threads (except the execing
1931 one) in the thread group, and resets the execing thread's
1932 tid to the tgid. No exit notification is sent for the
1933 execing thread -- from the ptracer's perspective, it
1934 appears as though the execing thread just vanishes.
1935 Until we reap all other threads except the leader and the
1936 execing thread, the leader will be zombie, and the
1937 execing thread will be in `D (disc sleep)'. As soon as
1938 all other threads are reaped, the execing thread changes
1939 it's tid to the tgid, and the previous (zombie) leader
1940 vanishes, giving place to the "new" leader. We could try
1941 distinguishing the exit and exec cases, by waiting once
1942 more, and seeing if something comes out, but it doesn't
1943 sound useful. The previous leader _does_ go away, and
1944 we'll re-add the new one once we see the exec event
1945 (which is just the same as what would happen if the
1946 previous leader did exit voluntarily before some other
1950 debug_printf ("CZL: Thread group leader %d zombie "
1951 "(it exited, or another thread execd).\n",
1954 delete_lwp (leader_lp
);
1959 /* Callback for `find_inferior'. Returns the first LWP that is not
1960 stopped. ARG is a PTID filter. */
1963 not_stopped_callback (thread_info
*thread
, void *arg
)
1965 struct lwp_info
*lwp
;
1966 ptid_t filter
= *(ptid_t
*) arg
;
1968 if (!ptid_match (ptid_of (thread
), filter
))
1971 lwp
= get_thread_lwp (thread
);
1978 /* Increment LWP's suspend count. */
1981 lwp_suspended_inc (struct lwp_info
*lwp
)
1985 if (debug_threads
&& lwp
->suspended
> 4)
1987 struct thread_info
*thread
= get_lwp_thread (lwp
);
1989 debug_printf ("LWP %ld has a suspiciously high suspend count,"
1990 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
1994 /* Decrement LWP's suspend count. */
1997 lwp_suspended_decr (struct lwp_info
*lwp
)
2001 if (lwp
->suspended
< 0)
2003 struct thread_info
*thread
= get_lwp_thread (lwp
);
2005 internal_error (__FILE__
, __LINE__
,
2006 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
2011 /* This function should only be called if the LWP got a SIGTRAP.
2013 Handle any tracepoint steps or hits. Return true if a tracepoint
2014 event was handled, 0 otherwise. */
2017 handle_tracepoints (struct lwp_info
*lwp
)
2019 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
2020 int tpoint_related_event
= 0;
2022 gdb_assert (lwp
->suspended
== 0);
2024 /* If this tracepoint hit causes a tracing stop, we'll immediately
2025 uninsert tracepoints. To do this, we temporarily pause all
2026 threads, unpatch away, and then unpause threads. We need to make
2027 sure the unpausing doesn't resume LWP too. */
2028 lwp_suspended_inc (lwp
);
2030 /* And we need to be sure that any all-threads-stopping doesn't try
2031 to move threads out of the jump pads, as it could deadlock the
2032 inferior (LWP could be in the jump pad, maybe even holding the
2035 /* Do any necessary step collect actions. */
2036 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2038 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2040 /* See if we just hit a tracepoint and do its main collect
2042 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2044 lwp_suspended_decr (lwp
);
2046 gdb_assert (lwp
->suspended
== 0);
2047 gdb_assert (!stabilizing_threads
2048 || (lwp
->collecting_fast_tracepoint
2049 != fast_tpoint_collect_result::not_collecting
));
2051 if (tpoint_related_event
)
2054 debug_printf ("got a tracepoint event\n");
2061 /* Convenience wrapper. Returns information about LWP's fast tracepoint
2062 collection status. */
2064 static fast_tpoint_collect_result
2065 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2066 struct fast_tpoint_collect_status
*status
)
2068 CORE_ADDR thread_area
;
2069 struct thread_info
*thread
= get_lwp_thread (lwp
);
2071 if (the_low_target
.get_thread_area
== NULL
)
2072 return fast_tpoint_collect_result::not_collecting
;
2074 /* Get the thread area address. This is used to recognize which
2075 thread is which when tracing with the in-process agent library.
2076 We don't read anything from the address, and treat it as opaque;
2077 it's the address itself that we assume is unique per-thread. */
2078 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2079 return fast_tpoint_collect_result::not_collecting
;
2081 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2084 /* The reason we resume in the caller, is because we want to be able
2085 to pass lwp->status_pending as WSTAT, and we need to clear
2086 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2087 refuses to resume. */
2090 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2092 struct thread_info
*saved_thread
;
2094 saved_thread
= current_thread
;
2095 current_thread
= get_lwp_thread (lwp
);
2098 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2099 && supports_fast_tracepoints ()
2100 && agent_loaded_p ())
2102 struct fast_tpoint_collect_status status
;
2105 debug_printf ("Checking whether LWP %ld needs to move out of the "
2107 lwpid_of (current_thread
));
2109 fast_tpoint_collect_result r
2110 = linux_fast_tracepoint_collecting (lwp
, &status
);
2113 || (WSTOPSIG (*wstat
) != SIGILL
2114 && WSTOPSIG (*wstat
) != SIGFPE
2115 && WSTOPSIG (*wstat
) != SIGSEGV
2116 && WSTOPSIG (*wstat
) != SIGBUS
))
2118 lwp
->collecting_fast_tracepoint
= r
;
2120 if (r
!= fast_tpoint_collect_result::not_collecting
)
2122 if (r
== fast_tpoint_collect_result::before_insn
2123 && lwp
->exit_jump_pad_bkpt
== NULL
)
2125 /* Haven't executed the original instruction yet.
2126 Set breakpoint there, and wait till it's hit,
2127 then single-step until exiting the jump pad. */
2128 lwp
->exit_jump_pad_bkpt
2129 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2133 debug_printf ("Checking whether LWP %ld needs to move out of "
2134 "the jump pad...it does\n",
2135 lwpid_of (current_thread
));
2136 current_thread
= saved_thread
;
2143 /* If we get a synchronous signal while collecting, *and*
2144 while executing the (relocated) original instruction,
2145 reset the PC to point at the tpoint address, before
2146 reporting to GDB. Otherwise, it's an IPA lib bug: just
2147 report the signal to GDB, and pray for the best. */
2149 lwp
->collecting_fast_tracepoint
2150 = fast_tpoint_collect_result::not_collecting
;
2152 if (r
!= fast_tpoint_collect_result::not_collecting
2153 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2154 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2157 struct regcache
*regcache
;
2159 /* The si_addr on a few signals references the address
2160 of the faulting instruction. Adjust that as
2162 if ((WSTOPSIG (*wstat
) == SIGILL
2163 || WSTOPSIG (*wstat
) == SIGFPE
2164 || WSTOPSIG (*wstat
) == SIGBUS
2165 || WSTOPSIG (*wstat
) == SIGSEGV
)
2166 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2167 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2168 /* Final check just to make sure we don't clobber
2169 the siginfo of non-kernel-sent signals. */
2170 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2172 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2173 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2174 (PTRACE_TYPE_ARG3
) 0, &info
);
2177 regcache
= get_thread_regcache (current_thread
, 1);
2178 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2179 lwp
->stop_pc
= status
.tpoint_addr
;
2181 /* Cancel any fast tracepoint lock this thread was
2183 force_unlock_trace_buffer ();
2186 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2189 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2190 "stopping all threads momentarily.\n");
2192 stop_all_lwps (1, lwp
);
2194 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2195 lwp
->exit_jump_pad_bkpt
= NULL
;
2197 unstop_all_lwps (1, lwp
);
2199 gdb_assert (lwp
->suspended
>= 0);
2205 debug_printf ("Checking whether LWP %ld needs to move out of the "
2207 lwpid_of (current_thread
));
2209 current_thread
= saved_thread
;
2213 /* Enqueue one signal in the "signals to report later when out of the
2217 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2219 struct pending_signals
*p_sig
;
2220 struct thread_info
*thread
= get_lwp_thread (lwp
);
2223 debug_printf ("Deferring signal %d for LWP %ld.\n",
2224 WSTOPSIG (*wstat
), lwpid_of (thread
));
2228 struct pending_signals
*sig
;
2230 for (sig
= lwp
->pending_signals_to_report
;
2233 debug_printf (" Already queued %d\n",
2236 debug_printf (" (no more currently queued signals)\n");
2239 /* Don't enqueue non-RT signals if they are already in the deferred
2240 queue. (SIGSTOP being the easiest signal to see ending up here
2242 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2244 struct pending_signals
*sig
;
2246 for (sig
= lwp
->pending_signals_to_report
;
2250 if (sig
->signal
== WSTOPSIG (*wstat
))
2253 debug_printf ("Not requeuing already queued non-RT signal %d"
2262 p_sig
= XCNEW (struct pending_signals
);
2263 p_sig
->prev
= lwp
->pending_signals_to_report
;
2264 p_sig
->signal
= WSTOPSIG (*wstat
);
2266 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2269 lwp
->pending_signals_to_report
= p_sig
;
2272 /* Dequeue one signal from the "signals to report later when out of
2273 the jump pad" list. */
2276 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2278 struct thread_info
*thread
= get_lwp_thread (lwp
);
2280 if (lwp
->pending_signals_to_report
!= NULL
)
2282 struct pending_signals
**p_sig
;
2284 p_sig
= &lwp
->pending_signals_to_report
;
2285 while ((*p_sig
)->prev
!= NULL
)
2286 p_sig
= &(*p_sig
)->prev
;
2288 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2289 if ((*p_sig
)->info
.si_signo
!= 0)
2290 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2296 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2297 WSTOPSIG (*wstat
), lwpid_of (thread
));
2301 struct pending_signals
*sig
;
2303 for (sig
= lwp
->pending_signals_to_report
;
2306 debug_printf (" Still queued %d\n",
2309 debug_printf (" (no more queued signals)\n");
2318 /* Fetch the possibly triggered data watchpoint info and store it in
2321 On some archs, like x86, that use debug registers to set
2322 watchpoints, it's possible that the way to know which watched
2323 address trapped, is to check the register that is used to select
2324 which address to watch. Problem is, between setting the watchpoint
2325 and reading back which data address trapped, the user may change
2326 the set of watchpoints, and, as a consequence, GDB changes the
2327 debug registers in the inferior. To avoid reading back a stale
2328 stopped-data-address when that happens, we cache in LP the fact
2329 that a watchpoint trapped, and the corresponding data address, as
2330 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2331 registers meanwhile, we have the cached data we can rely on. */
2334 check_stopped_by_watchpoint (struct lwp_info
*child
)
2336 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2338 struct thread_info
*saved_thread
;
2340 saved_thread
= current_thread
;
2341 current_thread
= get_lwp_thread (child
);
2343 if (the_low_target
.stopped_by_watchpoint ())
2345 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2347 if (the_low_target
.stopped_data_address
!= NULL
)
2348 child
->stopped_data_address
2349 = the_low_target
.stopped_data_address ();
2351 child
->stopped_data_address
= 0;
2354 current_thread
= saved_thread
;
2357 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2360 /* Return the ptrace options that we want to try to enable. */
2363 linux_low_ptrace_options (int attached
)
2368 options
|= PTRACE_O_EXITKILL
;
2370 if (report_fork_events
)
2371 options
|= PTRACE_O_TRACEFORK
;
2373 if (report_vfork_events
)
2374 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2376 if (report_exec_events
)
2377 options
|= PTRACE_O_TRACEEXEC
;
2379 options
|= PTRACE_O_TRACESYSGOOD
;
2384 /* Do low-level handling of the event, and check if we should go on
2385 and pass it to caller code. Return the affected lwp if we are, or
2388 static struct lwp_info
*
2389 linux_low_filter_event (int lwpid
, int wstat
)
2391 struct lwp_info
*child
;
2392 struct thread_info
*thread
;
2393 int have_stop_pc
= 0;
2395 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2397 /* Check for stop events reported by a process we didn't already
2398 know about - anything not already in our LWP list.
2400 If we're expecting to receive stopped processes after
2401 fork, vfork, and clone events, then we'll just add the
2402 new one to our list and go back to waiting for the event
2403 to be reported - the stopped process might be returned
2404 from waitpid before or after the event is.
2406 But note the case of a non-leader thread exec'ing after the
2407 leader having exited, and gone from our lists (because
2408 check_zombie_leaders deleted it). The non-leader thread
2409 changes its tid to the tgid. */
2411 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2412 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2416 /* A multi-thread exec after we had seen the leader exiting. */
2419 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2420 "after exec.\n", lwpid
);
2423 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2424 child
= add_lwp (child_ptid
);
2426 current_thread
= child
->thread
;
2429 /* If we didn't find a process, one of two things presumably happened:
2430 - A process we started and then detached from has exited. Ignore it.
2431 - A process we are controlling has forked and the new child's stop
2432 was reported to us by the kernel. Save its PID. */
2433 if (child
== NULL
&& WIFSTOPPED (wstat
))
2435 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2438 else if (child
== NULL
)
2441 thread
= get_lwp_thread (child
);
2445 child
->last_status
= wstat
;
2447 /* Check if the thread has exited. */
2448 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2451 debug_printf ("LLFE: %d exited.\n", lwpid
);
2453 if (finish_step_over (child
))
2455 /* Unsuspend all other LWPs, and set them back running again. */
2456 unsuspend_all_lwps (child
);
2459 /* If there is at least one more LWP, then the exit signal was
2460 not the end of the debugged application and should be
2461 ignored, unless GDB wants to hear about thread exits. */
2462 if (report_thread_events
2463 || last_thread_of_process_p (pid_of (thread
)))
2465 /* Since events are serialized to GDB core, and we can't
2466 report this one right now. Leave the status pending for
2467 the next time we're able to report it. */
2468 mark_lwp_dead (child
, wstat
);
2478 gdb_assert (WIFSTOPPED (wstat
));
2480 if (WIFSTOPPED (wstat
))
2482 struct process_info
*proc
;
2484 /* Architecture-specific setup after inferior is running. */
2485 proc
= find_process_pid (pid_of (thread
));
2486 if (proc
->tdesc
== NULL
)
2490 /* This needs to happen after we have attached to the
2491 inferior and it is stopped for the first time, but
2492 before we access any inferior registers. */
2493 linux_arch_setup_thread (thread
);
2497 /* The process is started, but GDBserver will do
2498 architecture-specific setup after the program stops at
2499 the first instruction. */
2500 child
->status_pending_p
= 1;
2501 child
->status_pending
= wstat
;
2507 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2509 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2510 int options
= linux_low_ptrace_options (proc
->attached
);
2512 linux_enable_event_reporting (lwpid
, options
);
2513 child
->must_set_ptrace_flags
= 0;
2516 /* Always update syscall_state, even if it will be filtered later. */
2517 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2519 child
->syscall_state
2520 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2521 ? TARGET_WAITKIND_SYSCALL_RETURN
2522 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2526 /* Almost all other ptrace-stops are known to be outside of system
2527 calls, with further exceptions in handle_extended_wait. */
2528 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2531 /* Be careful to not overwrite stop_pc until save_stop_reason is
2533 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2534 && linux_is_extended_waitstatus (wstat
))
2536 child
->stop_pc
= get_pc (child
);
2537 if (handle_extended_wait (&child
, wstat
))
2539 /* The event has been handled, so just return without
2545 if (linux_wstatus_maybe_breakpoint (wstat
))
2547 if (save_stop_reason (child
))
2552 child
->stop_pc
= get_pc (child
);
2554 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2555 && child
->stop_expected
)
2558 debug_printf ("Expected stop.\n");
2559 child
->stop_expected
= 0;
2561 if (thread
->last_resume_kind
== resume_stop
)
2563 /* We want to report the stop to the core. Treat the
2564 SIGSTOP as a normal event. */
2566 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2567 target_pid_to_str (ptid_of (thread
)));
2569 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2571 /* Stopping threads. We don't want this SIGSTOP to end up
2574 debug_printf ("LLW: SIGSTOP caught for %s "
2575 "while stopping threads.\n",
2576 target_pid_to_str (ptid_of (thread
)));
2581 /* This is a delayed SIGSTOP. Filter out the event. */
2583 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2584 child
->stepping
? "step" : "continue",
2585 target_pid_to_str (ptid_of (thread
)));
2587 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2592 child
->status_pending_p
= 1;
2593 child
->status_pending
= wstat
;
2597 /* Return true if THREAD is doing hardware single step. */
2600 maybe_hw_step (struct thread_info
*thread
)
2602 if (can_hardware_single_step ())
2606 /* GDBserver must insert single-step breakpoint for software
2608 gdb_assert (has_single_step_breakpoints (thread
));
2613 /* Resume LWPs that are currently stopped without any pending status
2614 to report, but are resumed from the core's perspective. */
2617 resume_stopped_resumed_lwps (thread_info
*thread
)
2619 struct lwp_info
*lp
= get_thread_lwp (thread
);
2623 && !lp
->status_pending_p
2624 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2628 if (thread
->last_resume_kind
== resume_step
)
2629 step
= maybe_hw_step (thread
);
2632 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2633 target_pid_to_str (ptid_of (thread
)),
2634 paddress (lp
->stop_pc
),
2637 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2641 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2642 match FILTER_PTID (leaving others pending). The PTIDs can be:
2643 minus_one_ptid, to specify any child; a pid PTID, specifying all
2644 lwps of a thread group; or a PTID representing a single lwp. Store
2645 the stop status through the status pointer WSTAT. OPTIONS is
2646 passed to the waitpid call. Return 0 if no event was found and
2647 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2648 was found. Return the PID of the stopped child otherwise. */
2651 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2652 int *wstatp
, int options
)
2654 struct thread_info
*event_thread
;
2655 struct lwp_info
*event_child
, *requested_child
;
2656 sigset_t block_mask
, prev_mask
;
2659 /* N.B. event_thread points to the thread_info struct that contains
2660 event_child. Keep them in sync. */
2661 event_thread
= NULL
;
2663 requested_child
= NULL
;
2665 /* Check for a lwp with a pending status. */
2667 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2669 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2671 return status_pending_p_callback (thread
, filter_ptid
);
2674 if (event_thread
!= NULL
)
2675 event_child
= get_thread_lwp (event_thread
);
2676 if (debug_threads
&& event_thread
)
2677 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2679 else if (!ptid_equal (filter_ptid
, null_ptid
))
2681 requested_child
= find_lwp_pid (filter_ptid
);
2683 if (stopping_threads
== NOT_STOPPING_THREADS
2684 && requested_child
->status_pending_p
2685 && (requested_child
->collecting_fast_tracepoint
2686 != fast_tpoint_collect_result::not_collecting
))
2688 enqueue_one_deferred_signal (requested_child
,
2689 &requested_child
->status_pending
);
2690 requested_child
->status_pending_p
= 0;
2691 requested_child
->status_pending
= 0;
2692 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2695 if (requested_child
->suspended
2696 && requested_child
->status_pending_p
)
2698 internal_error (__FILE__
, __LINE__
,
2699 "requesting an event out of a"
2700 " suspended child?");
2703 if (requested_child
->status_pending_p
)
2705 event_child
= requested_child
;
2706 event_thread
= get_lwp_thread (event_child
);
2710 if (event_child
!= NULL
)
2713 debug_printf ("Got an event from pending child %ld (%04x)\n",
2714 lwpid_of (event_thread
), event_child
->status_pending
);
2715 *wstatp
= event_child
->status_pending
;
2716 event_child
->status_pending_p
= 0;
2717 event_child
->status_pending
= 0;
2718 current_thread
= event_thread
;
2719 return lwpid_of (event_thread
);
2722 /* But if we don't find a pending event, we'll have to wait.
2724 We only enter this loop if no process has a pending wait status.
2725 Thus any action taken in response to a wait status inside this
2726 loop is responding as soon as we detect the status, not after any
2729 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2730 all signals while here. */
2731 sigfillset (&block_mask
);
2732 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2734 /* Always pull all events out of the kernel. We'll randomly select
2735 an event LWP out of all that have events, to prevent
2737 while (event_child
== NULL
)
2741 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2744 - If the thread group leader exits while other threads in the
2745 thread group still exist, waitpid(TGID, ...) hangs. That
2746 waitpid won't return an exit status until the other threads
2747 in the group are reaped.
2749 - When a non-leader thread execs, that thread just vanishes
2750 without reporting an exit (so we'd hang if we waited for it
2751 explicitly in that case). The exec event is reported to
2754 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2757 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2758 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2764 debug_printf ("LLW: waitpid %ld received %s\n",
2765 (long) ret
, status_to_str (*wstatp
));
2768 /* Filter all events. IOW, leave all events pending. We'll
2769 randomly select an event LWP out of all that have events
2771 linux_low_filter_event (ret
, *wstatp
);
2772 /* Retry until nothing comes out of waitpid. A single
2773 SIGCHLD can indicate more than one child stopped. */
2777 /* Now that we've pulled all events out of the kernel, resume
2778 LWPs that don't have an interesting event to report. */
2779 if (stopping_threads
== NOT_STOPPING_THREADS
)
2780 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2782 /* ... and find an LWP with a status to report to the core, if
2784 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2786 return status_pending_p_callback (thread
, filter_ptid
);
2789 if (event_thread
!= NULL
)
2791 event_child
= get_thread_lwp (event_thread
);
2792 *wstatp
= event_child
->status_pending
;
2793 event_child
->status_pending_p
= 0;
2794 event_child
->status_pending
= 0;
2798 /* Check for zombie thread group leaders. Those can't be reaped
2799 until all other threads in the thread group are. */
2800 check_zombie_leaders ();
2802 /* If there are no resumed children left in the set of LWPs we
2803 want to wait for, bail. We can't just block in
2804 waitpid/sigsuspend, because lwps might have been left stopped
2805 in trace-stop state, and we'd be stuck forever waiting for
2806 their status to change (which would only happen if we resumed
2807 them). Even if WNOHANG is set, this return code is preferred
2808 over 0 (below), as it is more detailed. */
2809 if ((find_inferior (&all_threads
,
2810 not_stopped_callback
,
2811 &wait_ptid
) == NULL
))
2814 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2815 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2819 /* No interesting event to report to the caller. */
2820 if ((options
& WNOHANG
))
2823 debug_printf ("WNOHANG set, no event found\n");
2825 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2829 /* Block until we get an event reported with SIGCHLD. */
2831 debug_printf ("sigsuspend'ing\n");
2833 sigsuspend (&prev_mask
);
2834 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2838 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2840 current_thread
= event_thread
;
2842 return lwpid_of (event_thread
);
2845 /* Wait for an event from child(ren) PTID. PTIDs can be:
2846 minus_one_ptid, to specify any child; a pid PTID, specifying all
2847 lwps of a thread group; or a PTID representing a single lwp. Store
2848 the stop status through the status pointer WSTAT. OPTIONS is
2849 passed to the waitpid call. Return 0 if no event was found and
2850 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2851 was found. Return the PID of the stopped child otherwise. */
2854 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2856 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2859 /* Count the LWP's that have had events. */
2862 count_events_callback (thread_info
*thread
, void *data
)
2864 struct lwp_info
*lp
= get_thread_lwp (thread
);
2865 int *count
= (int *) data
;
2867 gdb_assert (count
!= NULL
);
2869 /* Count only resumed LWPs that have an event pending. */
2870 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2871 && lp
->status_pending_p
)
2877 /* Select the LWP (if any) that is currently being single-stepped. */
2880 select_singlestep_lwp_callback (thread_info
*thread
, void *data
)
2882 struct lwp_info
*lp
= get_thread_lwp (thread
);
2884 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2885 && thread
->last_resume_kind
== resume_step
2886 && lp
->status_pending_p
)
2892 /* Select the Nth LWP that has had an event. */
2895 select_event_lwp_callback (thread_info
*thread
, void *data
)
2897 struct lwp_info
*lp
= get_thread_lwp (thread
);
2898 int *selector
= (int *) data
;
2900 gdb_assert (selector
!= NULL
);
2902 /* Select only resumed LWPs that have an event pending. */
2903 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2904 && lp
->status_pending_p
)
2905 if ((*selector
)-- == 0)
2911 /* Select one LWP out of those that have events pending. */
2914 select_event_lwp (struct lwp_info
**orig_lp
)
2917 int random_selector
;
2918 struct thread_info
*event_thread
= NULL
;
2920 /* In all-stop, give preference to the LWP that is being
2921 single-stepped. There will be at most one, and it's the LWP that
2922 the core is most interested in. If we didn't do this, then we'd
2923 have to handle pending step SIGTRAPs somehow in case the core
2924 later continues the previously-stepped thread, otherwise we'd
2925 report the pending SIGTRAP, and the core, not having stepped the
2926 thread, wouldn't understand what the trap was for, and therefore
2927 would report it to the user as a random signal. */
2931 = (struct thread_info
*) find_inferior (&all_threads
,
2932 select_singlestep_lwp_callback
,
2934 if (event_thread
!= NULL
)
2937 debug_printf ("SEL: Select single-step %s\n",
2938 target_pid_to_str (ptid_of (event_thread
)));
2941 if (event_thread
== NULL
)
2943 /* No single-stepping LWP. Select one at random, out of those
2944 which have had events. */
2946 /* First see how many events we have. */
2947 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2948 gdb_assert (num_events
> 0);
2950 /* Now randomly pick a LWP out of those that have had
2952 random_selector
= (int)
2953 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2955 if (debug_threads
&& num_events
> 1)
2956 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2957 num_events
, random_selector
);
2960 = (struct thread_info
*) find_inferior (&all_threads
,
2961 select_event_lwp_callback
,
2965 if (event_thread
!= NULL
)
2967 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2969 /* Switch the event LWP. */
2970 *orig_lp
= event_lp
;
2974 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2978 unsuspend_all_lwps (struct lwp_info
*except
)
2980 for_each_thread ([&] (thread_info
*thread
)
2982 lwp_info
*lwp
= get_thread_lwp (thread
);
2985 lwp_suspended_decr (lwp
);
2989 static void move_out_of_jump_pad_callback (thread_info
*thread
);
2990 static bool stuck_in_jump_pad_callback (thread_info
*thread
);
2991 static int lwp_running (thread_info
*thread
, void *data
);
2992 static ptid_t
linux_wait_1 (ptid_t ptid
,
2993 struct target_waitstatus
*ourstatus
,
2994 int target_options
);
2996 /* Stabilize threads (move out of jump pads).
2998 If a thread is midway collecting a fast tracepoint, we need to
2999 finish the collection and move it out of the jump pad before
3000 reporting the signal.
3002 This avoids recursion while collecting (when a signal arrives
3003 midway, and the signal handler itself collects), which would trash
3004 the trace buffer. In case the user set a breakpoint in a signal
3005 handler, this avoids the backtrace showing the jump pad, etc..
3006 Most importantly, there are certain things we can't do safely if
3007 threads are stopped in a jump pad (or in its callee's). For
3010 - starting a new trace run. A thread still collecting the
3011 previous run, could trash the trace buffer when resumed. The trace
3012 buffer control structures would have been reset but the thread had
3013 no way to tell. The thread could even midway memcpy'ing to the
3014 buffer, which would mean that when resumed, it would clobber the
3015 trace buffer that had been set for a new run.
3017 - we can't rewrite/reuse the jump pads for new tracepoints
3018 safely. Say you do tstart while a thread is stopped midway while
3019 collecting. When the thread is later resumed, it finishes the
3020 collection, and returns to the jump pad, to execute the original
3021 instruction that was under the tracepoint jump at the time the
3022 older run had been started. If the jump pad had been rewritten
3023 since for something else in the new run, the thread would now
3024 execute the wrong / random instructions. */
3027 linux_stabilize_threads (void)
3029 thread_info
*thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
3031 if (thread_stuck
!= NULL
)
3034 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
3035 lwpid_of (thread_stuck
));
3039 thread_info
*saved_thread
= current_thread
;
3041 stabilizing_threads
= 1;
3044 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
3046 /* Loop until all are stopped out of the jump pads. */
3047 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
3049 struct target_waitstatus ourstatus
;
3050 struct lwp_info
*lwp
;
3053 /* Note that we go through the full wait even loop. While
3054 moving threads out of jump pad, we need to be able to step
3055 over internal breakpoints and such. */
3056 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
3058 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
3060 lwp
= get_thread_lwp (current_thread
);
3063 lwp_suspended_inc (lwp
);
3065 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3066 || current_thread
->last_resume_kind
== resume_stop
)
3068 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3069 enqueue_one_deferred_signal (lwp
, &wstat
);
3074 unsuspend_all_lwps (NULL
);
3076 stabilizing_threads
= 0;
3078 current_thread
= saved_thread
;
3082 thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
3084 if (thread_stuck
!= NULL
)
3085 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3086 lwpid_of (thread_stuck
));
3090 /* Convenience function that is called when the kernel reports an
3091 event that is not passed out to GDB. */
3094 ignore_event (struct target_waitstatus
*ourstatus
)
3096 /* If we got an event, there may still be others, as a single
3097 SIGCHLD can indicate more than one child stopped. This forces
3098 another target_wait call. */
3101 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3105 /* Convenience function that is called when the kernel reports an exit
3106 event. This decides whether to report the event to GDB as a
3107 process exit event, a thread exit event, or to suppress the
3111 filter_exit_event (struct lwp_info
*event_child
,
3112 struct target_waitstatus
*ourstatus
)
3114 struct thread_info
*thread
= get_lwp_thread (event_child
);
3115 ptid_t ptid
= ptid_of (thread
);
3117 if (!last_thread_of_process_p (pid_of (thread
)))
3119 if (report_thread_events
)
3120 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3122 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3124 delete_lwp (event_child
);
3129 /* Returns 1 if GDB is interested in any event_child syscalls. */
3132 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3134 struct thread_info
*thread
= get_lwp_thread (event_child
);
3135 struct process_info
*proc
= get_thread_process (thread
);
3137 return !proc
->syscalls_to_catch
.empty ();
3140 /* Returns 1 if GDB is interested in the event_child syscall.
3141 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3144 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3147 struct thread_info
*thread
= get_lwp_thread (event_child
);
3148 struct process_info
*proc
= get_thread_process (thread
);
3150 if (proc
->syscalls_to_catch
.empty ())
3153 if (proc
->syscalls_to_catch
[0] == ANY_SYSCALL
)
3156 get_syscall_trapinfo (event_child
, &sysno
);
3158 for (int iter
: proc
->syscalls_to_catch
)
3165 /* Wait for process, returns status. */
3168 linux_wait_1 (ptid_t ptid
,
3169 struct target_waitstatus
*ourstatus
, int target_options
)
3172 struct lwp_info
*event_child
;
3175 int step_over_finished
;
3176 int bp_explains_trap
;
3177 int maybe_internal_trap
;
3186 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3189 /* Translate generic target options into linux options. */
3191 if (target_options
& TARGET_WNOHANG
)
3194 bp_explains_trap
= 0;
3197 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3199 auto status_pending_p_any
= [&] (thread_info
*thread
)
3201 return status_pending_p_callback (thread
, minus_one_ptid
);
3204 /* Find a resumed LWP, if any. */
3205 if (find_thread (status_pending_p_any
) != NULL
)
3207 else if ((find_inferior (&all_threads
,
3208 not_stopped_callback
,
3209 &minus_one_ptid
) != NULL
))
3214 if (ptid_equal (step_over_bkpt
, null_ptid
))
3215 pid
= linux_wait_for_event (ptid
, &w
, options
);
3219 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3220 target_pid_to_str (step_over_bkpt
));
3221 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3224 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3226 gdb_assert (target_options
& TARGET_WNOHANG
);
3230 debug_printf ("linux_wait_1 ret = null_ptid, "
3231 "TARGET_WAITKIND_IGNORE\n");
3235 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3242 debug_printf ("linux_wait_1 ret = null_ptid, "
3243 "TARGET_WAITKIND_NO_RESUMED\n");
3247 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3251 event_child
= get_thread_lwp (current_thread
);
3253 /* linux_wait_for_event only returns an exit status for the last
3254 child of a process. Report it. */
3255 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3259 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3260 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3264 debug_printf ("linux_wait_1 ret = %s, exited with "
3266 target_pid_to_str (ptid_of (current_thread
)),
3273 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3274 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3278 debug_printf ("linux_wait_1 ret = %s, terminated with "
3280 target_pid_to_str (ptid_of (current_thread
)),
3286 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3287 return filter_exit_event (event_child
, ourstatus
);
3289 return ptid_of (current_thread
);
3292 /* If step-over executes a breakpoint instruction, in the case of a
3293 hardware single step it means a gdb/gdbserver breakpoint had been
3294 planted on top of a permanent breakpoint, in the case of a software
3295 single step it may just mean that gdbserver hit the reinsert breakpoint.
3296 The PC has been adjusted by save_stop_reason to point at
3297 the breakpoint address.
3298 So in the case of the hardware single step advance the PC manually
3299 past the breakpoint and in the case of software single step advance only
3300 if it's not the single_step_breakpoint we are hitting.
3301 This avoids that a program would keep trapping a permanent breakpoint
3303 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3304 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3305 && (event_child
->stepping
3306 || !single_step_breakpoint_inserted_here (event_child
->stop_pc
)))
3308 int increment_pc
= 0;
3309 int breakpoint_kind
= 0;
3310 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3313 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3314 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3318 debug_printf ("step-over for %s executed software breakpoint\n",
3319 target_pid_to_str (ptid_of (current_thread
)));
3322 if (increment_pc
!= 0)
3324 struct regcache
*regcache
3325 = get_thread_regcache (current_thread
, 1);
3327 event_child
->stop_pc
+= increment_pc
;
3328 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3330 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3331 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3335 /* If this event was not handled before, and is not a SIGTRAP, we
3336 report it. SIGILL and SIGSEGV are also treated as traps in case
3337 a breakpoint is inserted at the current PC. If this target does
3338 not support internal breakpoints at all, we also report the
3339 SIGTRAP without further processing; it's of no concern to us. */
3341 = (supports_breakpoints ()
3342 && (WSTOPSIG (w
) == SIGTRAP
3343 || ((WSTOPSIG (w
) == SIGILL
3344 || WSTOPSIG (w
) == SIGSEGV
)
3345 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3347 if (maybe_internal_trap
)
3349 /* Handle anything that requires bookkeeping before deciding to
3350 report the event or continue waiting. */
3352 /* First check if we can explain the SIGTRAP with an internal
3353 breakpoint, or if we should possibly report the event to GDB.
3354 Do this before anything that may remove or insert a
3356 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3358 /* We have a SIGTRAP, possibly a step-over dance has just
3359 finished. If so, tweak the state machine accordingly,
3360 reinsert breakpoints and delete any single-step
3362 step_over_finished
= finish_step_over (event_child
);
3364 /* Now invoke the callbacks of any internal breakpoints there. */
3365 check_breakpoints (event_child
->stop_pc
);
3367 /* Handle tracepoint data collecting. This may overflow the
3368 trace buffer, and cause a tracing stop, removing
3370 trace_event
= handle_tracepoints (event_child
);
3372 if (bp_explains_trap
)
3375 debug_printf ("Hit a gdbserver breakpoint.\n");
3380 /* We have some other signal, possibly a step-over dance was in
3381 progress, and it should be cancelled too. */
3382 step_over_finished
= finish_step_over (event_child
);
3385 /* We have all the data we need. Either report the event to GDB, or
3386 resume threads and keep waiting for more. */
3388 /* If we're collecting a fast tracepoint, finish the collection and
3389 move out of the jump pad before delivering a signal. See
3390 linux_stabilize_threads. */
3393 && WSTOPSIG (w
) != SIGTRAP
3394 && supports_fast_tracepoints ()
3395 && agent_loaded_p ())
3398 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3399 "to defer or adjust it.\n",
3400 WSTOPSIG (w
), lwpid_of (current_thread
));
3402 /* Allow debugging the jump pad itself. */
3403 if (current_thread
->last_resume_kind
!= resume_step
3404 && maybe_move_out_of_jump_pad (event_child
, &w
))
3406 enqueue_one_deferred_signal (event_child
, &w
);
3409 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3410 WSTOPSIG (w
), lwpid_of (current_thread
));
3412 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3416 return ignore_event (ourstatus
);
3420 if (event_child
->collecting_fast_tracepoint
3421 != fast_tpoint_collect_result::not_collecting
)
3424 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3425 "Check if we're already there.\n",
3426 lwpid_of (current_thread
),
3427 (int) event_child
->collecting_fast_tracepoint
);
3431 event_child
->collecting_fast_tracepoint
3432 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3434 if (event_child
->collecting_fast_tracepoint
3435 != fast_tpoint_collect_result::before_insn
)
3437 /* No longer need this breakpoint. */
3438 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3441 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3442 "stopping all threads momentarily.\n");
3444 /* Other running threads could hit this breakpoint.
3445 We don't handle moribund locations like GDB does,
3446 instead we always pause all threads when removing
3447 breakpoints, so that any step-over or
3448 decr_pc_after_break adjustment is always taken
3449 care of while the breakpoint is still
3451 stop_all_lwps (1, event_child
);
3453 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3454 event_child
->exit_jump_pad_bkpt
= NULL
;
3456 unstop_all_lwps (1, event_child
);
3458 gdb_assert (event_child
->suspended
>= 0);
3462 if (event_child
->collecting_fast_tracepoint
3463 == fast_tpoint_collect_result::not_collecting
)
3466 debug_printf ("fast tracepoint finished "
3467 "collecting successfully.\n");
3469 /* We may have a deferred signal to report. */
3470 if (dequeue_one_deferred_signal (event_child
, &w
))
3473 debug_printf ("dequeued one signal.\n");
3478 debug_printf ("no deferred signals.\n");
3480 if (stabilizing_threads
)
3482 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3483 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3487 debug_printf ("linux_wait_1 ret = %s, stopped "
3488 "while stabilizing threads\n",
3489 target_pid_to_str (ptid_of (current_thread
)));
3493 return ptid_of (current_thread
);
3499 /* Check whether GDB would be interested in this event. */
3501 /* Check if GDB is interested in this syscall. */
3503 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3504 && !gdb_catch_this_syscall_p (event_child
))
3508 debug_printf ("Ignored syscall for LWP %ld.\n",
3509 lwpid_of (current_thread
));
3512 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3517 return ignore_event (ourstatus
);
3520 /* If GDB is not interested in this signal, don't stop other
3521 threads, and don't report it to GDB. Just resume the inferior
3522 right away. We do this for threading-related signals as well as
3523 any that GDB specifically requested we ignore. But never ignore
3524 SIGSTOP if we sent it ourselves, and do not ignore signals when
3525 stepping - they may require special handling to skip the signal
3526 handler. Also never ignore signals that could be caused by a
3529 && current_thread
->last_resume_kind
!= resume_step
3531 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3532 (current_process ()->priv
->thread_db
!= NULL
3533 && (WSTOPSIG (w
) == __SIGRTMIN
3534 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3537 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3538 && !(WSTOPSIG (w
) == SIGSTOP
3539 && current_thread
->last_resume_kind
== resume_stop
)
3540 && !linux_wstatus_maybe_breakpoint (w
))))
3542 siginfo_t info
, *info_p
;
3545 debug_printf ("Ignored signal %d for LWP %ld.\n",
3546 WSTOPSIG (w
), lwpid_of (current_thread
));
3548 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3549 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3554 if (step_over_finished
)
3556 /* We cancelled this thread's step-over above. We still
3557 need to unsuspend all other LWPs, and set them back
3558 running again while the signal handler runs. */
3559 unsuspend_all_lwps (event_child
);
3561 /* Enqueue the pending signal info so that proceed_all_lwps
3563 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3565 proceed_all_lwps ();
3569 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3570 WSTOPSIG (w
), info_p
);
3576 return ignore_event (ourstatus
);
3579 /* Note that all addresses are always "out of the step range" when
3580 there's no range to begin with. */
3581 in_step_range
= lwp_in_step_range (event_child
);
3583 /* If GDB wanted this thread to single step, and the thread is out
3584 of the step range, we always want to report the SIGTRAP, and let
3585 GDB handle it. Watchpoints should always be reported. So should
3586 signals we can't explain. A SIGTRAP we can't explain could be a
3587 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3588 do, we're be able to handle GDB breakpoints on top of internal
3589 breakpoints, by handling the internal breakpoint and still
3590 reporting the event to GDB. If we don't, we're out of luck, GDB
3591 won't see the breakpoint hit. If we see a single-step event but
3592 the thread should be continuing, don't pass the trap to gdb.
3593 That indicates that we had previously finished a single-step but
3594 left the single-step pending -- see
3595 complete_ongoing_step_over. */
3596 report_to_gdb
= (!maybe_internal_trap
3597 || (current_thread
->last_resume_kind
== resume_step
3599 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3601 && !bp_explains_trap
3603 && !step_over_finished
3604 && !(current_thread
->last_resume_kind
== resume_continue
3605 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3606 || (gdb_breakpoint_here (event_child
->stop_pc
)
3607 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3608 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3609 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3611 run_breakpoint_commands (event_child
->stop_pc
);
3613 /* We found no reason GDB would want us to stop. We either hit one
3614 of our own breakpoints, or finished an internal step GDB
3615 shouldn't know about. */
3620 if (bp_explains_trap
)
3621 debug_printf ("Hit a gdbserver breakpoint.\n");
3622 if (step_over_finished
)
3623 debug_printf ("Step-over finished.\n");
3625 debug_printf ("Tracepoint event.\n");
3626 if (lwp_in_step_range (event_child
))
3627 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3628 paddress (event_child
->stop_pc
),
3629 paddress (event_child
->step_range_start
),
3630 paddress (event_child
->step_range_end
));
3633 /* We're not reporting this breakpoint to GDB, so apply the
3634 decr_pc_after_break adjustment to the inferior's regcache
3637 if (the_low_target
.set_pc
!= NULL
)
3639 struct regcache
*regcache
3640 = get_thread_regcache (current_thread
, 1);
3641 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3644 if (step_over_finished
)
3646 /* If we have finished stepping over a breakpoint, we've
3647 stopped and suspended all LWPs momentarily except the
3648 stepping one. This is where we resume them all again.
3649 We're going to keep waiting, so use proceed, which
3650 handles stepping over the next breakpoint. */
3651 unsuspend_all_lwps (event_child
);
3655 /* Remove the single-step breakpoints if any. Note that
3656 there isn't single-step breakpoint if we finished stepping
3658 if (can_software_single_step ()
3659 && has_single_step_breakpoints (current_thread
))
3661 stop_all_lwps (0, event_child
);
3662 delete_single_step_breakpoints (current_thread
);
3663 unstop_all_lwps (0, event_child
);
3668 debug_printf ("proceeding all threads.\n");
3669 proceed_all_lwps ();
3674 return ignore_event (ourstatus
);
3679 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3682 = target_waitstatus_to_string (&event_child
->waitstatus
);
3684 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3685 lwpid_of (get_lwp_thread (event_child
)), str
.c_str ());
3687 if (current_thread
->last_resume_kind
== resume_step
)
3689 if (event_child
->step_range_start
== event_child
->step_range_end
)
3690 debug_printf ("GDB wanted to single-step, reporting event.\n");
3691 else if (!lwp_in_step_range (event_child
))
3692 debug_printf ("Out of step range, reporting event.\n");
3694 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3695 debug_printf ("Stopped by watchpoint.\n");
3696 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3697 debug_printf ("Stopped by GDB breakpoint.\n");
3699 debug_printf ("Hit a non-gdbserver trap event.\n");
3702 /* Alright, we're going to report a stop. */
3704 /* Remove single-step breakpoints. */
3705 if (can_software_single_step ())
3707 /* Remove single-step breakpoints or not. It it is true, stop all
3708 lwps, so that other threads won't hit the breakpoint in the
3710 int remove_single_step_breakpoints_p
= 0;
3714 remove_single_step_breakpoints_p
3715 = has_single_step_breakpoints (current_thread
);
3719 /* In all-stop, a stop reply cancels all previous resume
3720 requests. Delete all single-step breakpoints. */
3722 find_thread ([&] (thread_info
*thread
) {
3723 if (has_single_step_breakpoints (thread
))
3725 remove_single_step_breakpoints_p
= 1;
3733 if (remove_single_step_breakpoints_p
)
3735 /* If we remove single-step breakpoints from memory, stop all lwps,
3736 so that other threads won't hit the breakpoint in the staled
3738 stop_all_lwps (0, event_child
);
3742 gdb_assert (has_single_step_breakpoints (current_thread
));
3743 delete_single_step_breakpoints (current_thread
);
3747 for_each_thread ([] (thread_info
*thread
){
3748 if (has_single_step_breakpoints (thread
))
3749 delete_single_step_breakpoints (thread
);
3753 unstop_all_lwps (0, event_child
);
3757 if (!stabilizing_threads
)
3759 /* In all-stop, stop all threads. */
3761 stop_all_lwps (0, NULL
);
3763 if (step_over_finished
)
3767 /* If we were doing a step-over, all other threads but
3768 the stepping one had been paused in start_step_over,
3769 with their suspend counts incremented. We don't want
3770 to do a full unstop/unpause, because we're in
3771 all-stop mode (so we want threads stopped), but we
3772 still need to unsuspend the other threads, to
3773 decrement their `suspended' count back. */
3774 unsuspend_all_lwps (event_child
);
3778 /* If we just finished a step-over, then all threads had
3779 been momentarily paused. In all-stop, that's fine,
3780 we want threads stopped by now anyway. In non-stop,
3781 we need to re-resume threads that GDB wanted to be
3783 unstop_all_lwps (1, event_child
);
3787 /* If we're not waiting for a specific LWP, choose an event LWP
3788 from among those that have had events. Giving equal priority
3789 to all LWPs that have had events helps prevent
3791 if (ptid_equal (ptid
, minus_one_ptid
))
3793 event_child
->status_pending_p
= 1;
3794 event_child
->status_pending
= w
;
3796 select_event_lwp (&event_child
);
3798 /* current_thread and event_child must stay in sync. */
3799 current_thread
= get_lwp_thread (event_child
);
3801 event_child
->status_pending_p
= 0;
3802 w
= event_child
->status_pending
;
3806 /* Stabilize threads (move out of jump pads). */
3808 stabilize_threads ();
3812 /* If we just finished a step-over, then all threads had been
3813 momentarily paused. In all-stop, that's fine, we want
3814 threads stopped by now anyway. In non-stop, we need to
3815 re-resume threads that GDB wanted to be running. */
3816 if (step_over_finished
)
3817 unstop_all_lwps (1, event_child
);
3820 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3822 /* If the reported event is an exit, fork, vfork or exec, let
3825 /* Break the unreported fork relationship chain. */
3826 if (event_child
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
3827 || event_child
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
)
3829 event_child
->fork_relative
->fork_relative
= NULL
;
3830 event_child
->fork_relative
= NULL
;
3833 *ourstatus
= event_child
->waitstatus
;
3834 /* Clear the event lwp's waitstatus since we handled it already. */
3835 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3838 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3840 /* Now that we've selected our final event LWP, un-adjust its PC if
3841 it was a software breakpoint, and the client doesn't know we can
3842 adjust the breakpoint ourselves. */
3843 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3844 && !swbreak_feature
)
3846 int decr_pc
= the_low_target
.decr_pc_after_break
;
3850 struct regcache
*regcache
3851 = get_thread_regcache (current_thread
, 1);
3852 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3856 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3858 get_syscall_trapinfo (event_child
,
3859 &ourstatus
->value
.syscall_number
);
3860 ourstatus
->kind
= event_child
->syscall_state
;
3862 else if (current_thread
->last_resume_kind
== resume_stop
3863 && WSTOPSIG (w
) == SIGSTOP
)
3865 /* A thread that has been requested to stop by GDB with vCont;t,
3866 and it stopped cleanly, so report as SIG0. The use of
3867 SIGSTOP is an implementation detail. */
3868 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3870 else if (current_thread
->last_resume_kind
== resume_stop
3871 && WSTOPSIG (w
) != SIGSTOP
)
3873 /* A thread that has been requested to stop by GDB with vCont;t,
3874 but, it stopped for other reasons. */
3875 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3877 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3879 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3882 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3886 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3887 target_pid_to_str (ptid_of (current_thread
)),
3888 ourstatus
->kind
, ourstatus
->value
.sig
);
3892 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3893 return filter_exit_event (event_child
, ourstatus
);
3895 return ptid_of (current_thread
);
3898 /* Get rid of any pending event in the pipe. */
3900 async_file_flush (void)
3906 ret
= read (linux_event_pipe
[0], &buf
, 1);
3907 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3910 /* Put something in the pipe, so the event loop wakes up. */
3912 async_file_mark (void)
3916 async_file_flush ();
3919 ret
= write (linux_event_pipe
[1], "+", 1);
3920 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3922 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3923 be awakened anyway. */
3927 linux_wait (ptid_t ptid
,
3928 struct target_waitstatus
*ourstatus
, int target_options
)
3932 /* Flush the async file first. */
3933 if (target_is_async_p ())
3934 async_file_flush ();
3938 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3940 while ((target_options
& TARGET_WNOHANG
) == 0
3941 && ptid_equal (event_ptid
, null_ptid
)
3942 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3944 /* If at least one stop was reported, there may be more. A single
3945 SIGCHLD can signal more than one child stop. */
3946 if (target_is_async_p ()
3947 && (target_options
& TARGET_WNOHANG
) != 0
3948 && !ptid_equal (event_ptid
, null_ptid
))
3954 /* Send a signal to an LWP. */
3957 kill_lwp (unsigned long lwpid
, int signo
)
3962 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3963 if (errno
== ENOSYS
)
3965 /* If tkill fails, then we are not using nptl threads, a
3966 configuration we no longer support. */
3967 perror_with_name (("tkill"));
3973 linux_stop_lwp (struct lwp_info
*lwp
)
3979 send_sigstop (struct lwp_info
*lwp
)
3983 pid
= lwpid_of (get_lwp_thread (lwp
));
3985 /* If we already have a pending stop signal for this process, don't
3987 if (lwp
->stop_expected
)
3990 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3996 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3998 lwp
->stop_expected
= 1;
3999 kill_lwp (pid
, SIGSTOP
);
4003 send_sigstop_callback (thread_info
*thread
, void *except
)
4005 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4007 /* Ignore EXCEPT. */
4018 /* Increment the suspend count of an LWP, and stop it, if not stopped
4021 suspend_and_send_sigstop_callback (thread_info
*thread
, void *except
)
4023 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4025 /* Ignore EXCEPT. */
4029 lwp_suspended_inc (lwp
);
4031 return send_sigstop_callback (thread
, except
);
4035 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
4037 /* Store the exit status for later. */
4038 lwp
->status_pending_p
= 1;
4039 lwp
->status_pending
= wstat
;
4041 /* Store in waitstatus as well, as there's nothing else to process
4043 if (WIFEXITED (wstat
))
4045 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
4046 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
4048 else if (WIFSIGNALED (wstat
))
4050 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
4051 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
4054 /* Prevent trying to stop it. */
4057 /* No further stops are expected from a dead lwp. */
4058 lwp
->stop_expected
= 0;
4061 /* Return true if LWP has exited already, and has a pending exit event
4062 to report to GDB. */
4065 lwp_is_marked_dead (struct lwp_info
*lwp
)
4067 return (lwp
->status_pending_p
4068 && (WIFEXITED (lwp
->status_pending
)
4069 || WIFSIGNALED (lwp
->status_pending
)));
4072 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4075 wait_for_sigstop (void)
4077 struct thread_info
*saved_thread
;
4082 saved_thread
= current_thread
;
4083 if (saved_thread
!= NULL
)
4084 saved_tid
= saved_thread
->id
;
4086 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4089 debug_printf ("wait_for_sigstop: pulling events\n");
4091 /* Passing NULL_PTID as filter indicates we want all events to be
4092 left pending. Eventually this returns when there are no
4093 unwaited-for children left. */
4094 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4096 gdb_assert (ret
== -1);
4098 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4099 current_thread
= saved_thread
;
4103 debug_printf ("Previously current thread died.\n");
4105 /* We can't change the current inferior behind GDB's back,
4106 otherwise, a subsequent command may apply to the wrong
4108 current_thread
= NULL
;
4112 /* Returns true if THREAD is stopped in a jump pad, and we can't
4113 move it out, because we need to report the stop event to GDB. For
4114 example, if the user puts a breakpoint in the jump pad, it's
4115 because she wants to debug it. */
4118 stuck_in_jump_pad_callback (thread_info
*thread
)
4120 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4122 if (lwp
->suspended
!= 0)
4124 internal_error (__FILE__
, __LINE__
,
4125 "LWP %ld is suspended, suspended=%d\n",
4126 lwpid_of (thread
), lwp
->suspended
);
4128 gdb_assert (lwp
->stopped
);
4130 /* Allow debugging the jump pad, gdb_collect, etc.. */
4131 return (supports_fast_tracepoints ()
4132 && agent_loaded_p ()
4133 && (gdb_breakpoint_here (lwp
->stop_pc
)
4134 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4135 || thread
->last_resume_kind
== resume_step
)
4136 && (linux_fast_tracepoint_collecting (lwp
, NULL
)
4137 != fast_tpoint_collect_result::not_collecting
));
4141 move_out_of_jump_pad_callback (thread_info
*thread
)
4143 struct thread_info
*saved_thread
;
4144 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4147 if (lwp
->suspended
!= 0)
4149 internal_error (__FILE__
, __LINE__
,
4150 "LWP %ld is suspended, suspended=%d\n",
4151 lwpid_of (thread
), lwp
->suspended
);
4153 gdb_assert (lwp
->stopped
);
4155 /* For gdb_breakpoint_here. */
4156 saved_thread
= current_thread
;
4157 current_thread
= thread
;
4159 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4161 /* Allow debugging the jump pad, gdb_collect, etc. */
4162 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4163 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4164 && thread
->last_resume_kind
!= resume_step
4165 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4168 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4173 lwp
->status_pending_p
= 0;
4174 enqueue_one_deferred_signal (lwp
, wstat
);
4177 debug_printf ("Signal %d for LWP %ld deferred "
4179 WSTOPSIG (*wstat
), lwpid_of (thread
));
4182 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4185 lwp_suspended_inc (lwp
);
4187 current_thread
= saved_thread
;
4191 lwp_running (thread_info
*thread
, void *data
)
4193 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4195 if (lwp_is_marked_dead (lwp
))
4202 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4203 If SUSPEND, then also increase the suspend count of every LWP,
4207 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4209 /* Should not be called recursively. */
4210 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4215 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4216 suspend
? "stop-and-suspend" : "stop",
4218 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4222 stopping_threads
= (suspend
4223 ? STOPPING_AND_SUSPENDING_THREADS
4224 : STOPPING_THREADS
);
4227 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
4229 find_inferior (&all_threads
, send_sigstop_callback
, except
);
4230 wait_for_sigstop ();
4231 stopping_threads
= NOT_STOPPING_THREADS
;
4235 debug_printf ("stop_all_lwps done, setting stopping_threads "
4236 "back to !stopping\n");
4241 /* Enqueue one signal in the chain of signals which need to be
4242 delivered to this process on next resume. */
4245 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4247 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4249 p_sig
->prev
= lwp
->pending_signals
;
4250 p_sig
->signal
= signal
;
4252 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4254 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4255 lwp
->pending_signals
= p_sig
;
4258 /* Install breakpoints for software single stepping. */
4261 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4263 struct thread_info
*thread
= get_lwp_thread (lwp
);
4264 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4265 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
4267 current_thread
= thread
;
4268 std::vector
<CORE_ADDR
> next_pcs
= the_low_target
.get_next_pcs (regcache
);
4270 for (CORE_ADDR pc
: next_pcs
)
4271 set_single_step_breakpoint (pc
, current_ptid
);
4273 do_cleanups (old_chain
);
4276 /* Single step via hardware or software single step.
4277 Return 1 if hardware single stepping, 0 if software single stepping
4278 or can't single step. */
4281 single_step (struct lwp_info
* lwp
)
4285 if (can_hardware_single_step ())
4289 else if (can_software_single_step ())
4291 install_software_single_step_breakpoints (lwp
);
4297 debug_printf ("stepping is not implemented on this target");
4303 /* The signal can be delivered to the inferior if we are not trying to
4304 finish a fast tracepoint collect. Since signal can be delivered in
4305 the step-over, the program may go to signal handler and trap again
4306 after return from the signal handler. We can live with the spurious
4310 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4312 return (lwp
->collecting_fast_tracepoint
4313 == fast_tpoint_collect_result::not_collecting
);
4316 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4317 SIGNAL is nonzero, give it that signal. */
4320 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4321 int step
, int signal
, siginfo_t
*info
)
4323 struct thread_info
*thread
= get_lwp_thread (lwp
);
4324 struct thread_info
*saved_thread
;
4326 struct process_info
*proc
= get_thread_process (thread
);
4328 /* Note that target description may not be initialised
4329 (proc->tdesc == NULL) at this point because the program hasn't
4330 stopped at the first instruction yet. It means GDBserver skips
4331 the extra traps from the wrapper program (see option --wrapper).
4332 Code in this function that requires register access should be
4333 guarded by proc->tdesc == NULL or something else. */
4335 if (lwp
->stopped
== 0)
4338 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4340 fast_tpoint_collect_result fast_tp_collecting
4341 = lwp
->collecting_fast_tracepoint
;
4343 gdb_assert (!stabilizing_threads
4344 || (fast_tp_collecting
4345 != fast_tpoint_collect_result::not_collecting
));
4347 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4348 user used the "jump" command, or "set $pc = foo"). */
4349 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4351 /* Collecting 'while-stepping' actions doesn't make sense
4353 release_while_stepping_state_list (thread
);
4356 /* If we have pending signals or status, and a new signal, enqueue the
4357 signal. Also enqueue the signal if it can't be delivered to the
4358 inferior right now. */
4360 && (lwp
->status_pending_p
4361 || lwp
->pending_signals
!= NULL
4362 || !lwp_signal_can_be_delivered (lwp
)))
4364 enqueue_pending_signal (lwp
, signal
, info
);
4366 /* Postpone any pending signal. It was enqueued above. */
4370 if (lwp
->status_pending_p
)
4373 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4374 " has pending status\n",
4375 lwpid_of (thread
), step
? "step" : "continue",
4376 lwp
->stop_expected
? "expected" : "not expected");
4380 saved_thread
= current_thread
;
4381 current_thread
= thread
;
4383 /* This bit needs some thinking about. If we get a signal that
4384 we must report while a single-step reinsert is still pending,
4385 we often end up resuming the thread. It might be better to
4386 (ew) allow a stack of pending events; then we could be sure that
4387 the reinsert happened right away and not lose any signals.
4389 Making this stack would also shrink the window in which breakpoints are
4390 uninserted (see comment in linux_wait_for_lwp) but not enough for
4391 complete correctness, so it won't solve that problem. It may be
4392 worthwhile just to solve this one, however. */
4393 if (lwp
->bp_reinsert
!= 0)
4396 debug_printf (" pending reinsert at 0x%s\n",
4397 paddress (lwp
->bp_reinsert
));
4399 if (can_hardware_single_step ())
4401 if (fast_tp_collecting
== fast_tpoint_collect_result::not_collecting
)
4404 warning ("BAD - reinserting but not stepping.");
4406 warning ("BAD - reinserting and suspended(%d).",
4411 step
= maybe_hw_step (thread
);
4414 if (fast_tp_collecting
== fast_tpoint_collect_result::before_insn
)
4417 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4418 " (exit-jump-pad-bkpt)\n",
4421 else if (fast_tp_collecting
== fast_tpoint_collect_result::at_insn
)
4424 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4425 " single-stepping\n",
4428 if (can_hardware_single_step ())
4432 internal_error (__FILE__
, __LINE__
,
4433 "moving out of jump pad single-stepping"
4434 " not implemented on this target");
4438 /* If we have while-stepping actions in this thread set it stepping.
4439 If we have a signal to deliver, it may or may not be set to
4440 SIG_IGN, we don't know. Assume so, and allow collecting
4441 while-stepping into a signal handler. A possible smart thing to
4442 do would be to set an internal breakpoint at the signal return
4443 address, continue, and carry on catching this while-stepping
4444 action only when that breakpoint is hit. A future
4446 if (thread
->while_stepping
!= NULL
)
4449 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4452 step
= single_step (lwp
);
4455 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4457 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4459 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4463 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4464 (long) lwp
->stop_pc
);
4468 /* If we have pending signals, consume one if it can be delivered to
4470 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4472 struct pending_signals
**p_sig
;
4474 p_sig
= &lwp
->pending_signals
;
4475 while ((*p_sig
)->prev
!= NULL
)
4476 p_sig
= &(*p_sig
)->prev
;
4478 signal
= (*p_sig
)->signal
;
4479 if ((*p_sig
)->info
.si_signo
!= 0)
4480 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4488 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4489 lwpid_of (thread
), step
? "step" : "continue", signal
,
4490 lwp
->stop_expected
? "expected" : "not expected");
4492 if (the_low_target
.prepare_to_resume
!= NULL
)
4493 the_low_target
.prepare_to_resume (lwp
);
4495 regcache_invalidate_thread (thread
);
4497 lwp
->stepping
= step
;
4499 ptrace_request
= PTRACE_SINGLESTEP
;
4500 else if (gdb_catching_syscalls_p (lwp
))
4501 ptrace_request
= PTRACE_SYSCALL
;
4503 ptrace_request
= PTRACE_CONT
;
4504 ptrace (ptrace_request
,
4506 (PTRACE_TYPE_ARG3
) 0,
4507 /* Coerce to a uintptr_t first to avoid potential gcc warning
4508 of coercing an 8 byte integer to a 4 byte pointer. */
4509 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4511 current_thread
= saved_thread
;
4513 perror_with_name ("resuming thread");
4515 /* Successfully resumed. Clear state that no longer makes sense,
4516 and mark the LWP as running. Must not do this before resuming
4517 otherwise if that fails other code will be confused. E.g., we'd
4518 later try to stop the LWP and hang forever waiting for a stop
4519 status. Note that we must not throw after this is cleared,
4520 otherwise handle_zombie_lwp_error would get confused. */
4522 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4525 /* Called when we try to resume a stopped LWP and that errors out. If
4526 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4527 or about to become), discard the error, clear any pending status
4528 the LWP may have, and return true (we'll collect the exit status
4529 soon enough). Otherwise, return false. */
4532 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4534 struct thread_info
*thread
= get_lwp_thread (lp
);
4536 /* If we get an error after resuming the LWP successfully, we'd
4537 confuse !T state for the LWP being gone. */
4538 gdb_assert (lp
->stopped
);
4540 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4541 because even if ptrace failed with ESRCH, the tracee may be "not
4542 yet fully dead", but already refusing ptrace requests. In that
4543 case the tracee has 'R (Running)' state for a little bit
4544 (observed in Linux 3.18). See also the note on ESRCH in the
4545 ptrace(2) man page. Instead, check whether the LWP has any state
4546 other than ptrace-stopped. */
4548 /* Don't assume anything if /proc/PID/status can't be read. */
4549 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4551 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4552 lp
->status_pending_p
= 0;
4558 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4559 disappears while we try to resume it. */
4562 linux_resume_one_lwp (struct lwp_info
*lwp
,
4563 int step
, int signal
, siginfo_t
*info
)
4567 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4569 CATCH (ex
, RETURN_MASK_ERROR
)
4571 if (!check_ptrace_stopped_lwp_gone (lwp
))
4572 throw_exception (ex
);
4577 /* This function is called once per thread via for_each_thread.
4578 We look up which resume request applies to THREAD and mark it with a
4579 pointer to the appropriate resume request.
4581 This algorithm is O(threads * resume elements), but resume elements
4582 is small (and will remain small at least until GDB supports thread
4586 linux_set_resume_request (thread_info
*thread
, thread_resume
*resume
, size_t n
)
4588 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4590 for (int ndx
= 0; ndx
< n
; ndx
++)
4592 ptid_t ptid
= resume
[ndx
].thread
;
4593 if (ptid_equal (ptid
, minus_one_ptid
)
4594 || ptid
== thread
->id
4595 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4597 || (ptid_get_pid (ptid
) == pid_of (thread
)
4598 && (ptid_is_pid (ptid
)
4599 || ptid_get_lwp (ptid
) == -1)))
4601 if (resume
[ndx
].kind
== resume_stop
4602 && thread
->last_resume_kind
== resume_stop
)
4605 debug_printf ("already %s LWP %ld at GDB's request\n",
4606 (thread
->last_status
.kind
4607 == TARGET_WAITKIND_STOPPED
)
4615 /* Ignore (wildcard) resume requests for already-resumed
4617 if (resume
[ndx
].kind
!= resume_stop
4618 && thread
->last_resume_kind
!= resume_stop
)
4621 debug_printf ("already %s LWP %ld at GDB's request\n",
4622 (thread
->last_resume_kind
4630 /* Don't let wildcard resumes resume fork children that GDB
4631 does not yet know are new fork children. */
4632 if (lwp
->fork_relative
!= NULL
)
4634 struct lwp_info
*rel
= lwp
->fork_relative
;
4636 if (rel
->status_pending_p
4637 && (rel
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
4638 || rel
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
))
4641 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4647 /* If the thread has a pending event that has already been
4648 reported to GDBserver core, but GDB has not pulled the
4649 event out of the vStopped queue yet, likewise, ignore the
4650 (wildcard) resume request. */
4651 if (in_queued_stop_replies (thread
->id
))
4654 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4659 lwp
->resume
= &resume
[ndx
];
4660 thread
->last_resume_kind
= lwp
->resume
->kind
;
4662 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4663 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4665 /* If we had a deferred signal to report, dequeue one now.
4666 This can happen if LWP gets more than one signal while
4667 trying to get out of a jump pad. */
4669 && !lwp
->status_pending_p
4670 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4672 lwp
->status_pending_p
= 1;
4675 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4676 "leaving status pending.\n",
4677 WSTOPSIG (lwp
->status_pending
),
4685 /* No resume action for this thread. */
4689 /* find_inferior callback for linux_resume.
4690 Set *FLAG_P if this lwp has an interesting status pending. */
4693 resume_status_pending_p (thread_info
*thread
)
4695 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4697 /* LWPs which will not be resumed are not interesting, because
4698 we might not wait for them next time through linux_wait. */
4699 if (lwp
->resume
== NULL
)
4702 return thread_still_has_status_pending_p (thread
);
4705 /* Return 1 if this lwp that GDB wants running is stopped at an
4706 internal breakpoint that we need to step over. It assumes that any
4707 required STOP_PC adjustment has already been propagated to the
4708 inferior's regcache. */
4711 need_step_over_p (thread_info
*thread
)
4713 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4714 struct thread_info
*saved_thread
;
4716 struct process_info
*proc
= get_thread_process (thread
);
4718 /* GDBserver is skipping the extra traps from the wrapper program,
4719 don't have to do step over. */
4720 if (proc
->tdesc
== NULL
)
4723 /* LWPs which will not be resumed are not interesting, because we
4724 might not wait for them next time through linux_wait. */
4729 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4734 if (thread
->last_resume_kind
== resume_stop
)
4737 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4743 gdb_assert (lwp
->suspended
>= 0);
4748 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4753 if (lwp
->status_pending_p
)
4756 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4762 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4766 /* If the PC has changed since we stopped, then don't do anything,
4767 and let the breakpoint/tracepoint be hit. This happens if, for
4768 instance, GDB handled the decr_pc_after_break subtraction itself,
4769 GDB is OOL stepping this thread, or the user has issued a "jump"
4770 command, or poked thread's registers herself. */
4771 if (pc
!= lwp
->stop_pc
)
4774 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4775 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4777 paddress (lwp
->stop_pc
), paddress (pc
));
4781 /* On software single step target, resume the inferior with signal
4782 rather than stepping over. */
4783 if (can_software_single_step ()
4784 && lwp
->pending_signals
!= NULL
4785 && lwp_signal_can_be_delivered (lwp
))
4788 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4795 saved_thread
= current_thread
;
4796 current_thread
= thread
;
4798 /* We can only step over breakpoints we know about. */
4799 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4801 /* Don't step over a breakpoint that GDB expects to hit
4802 though. If the condition is being evaluated on the target's side
4803 and it evaluate to false, step over this breakpoint as well. */
4804 if (gdb_breakpoint_here (pc
)
4805 && gdb_condition_true_at_breakpoint (pc
)
4806 && gdb_no_commands_at_breakpoint (pc
))
4809 debug_printf ("Need step over [LWP %ld]? yes, but found"
4810 " GDB breakpoint at 0x%s; skipping step over\n",
4811 lwpid_of (thread
), paddress (pc
));
4813 current_thread
= saved_thread
;
4819 debug_printf ("Need step over [LWP %ld]? yes, "
4820 "found breakpoint at 0x%s\n",
4821 lwpid_of (thread
), paddress (pc
));
4823 /* We've found an lwp that needs stepping over --- return 1 so
4824 that find_inferior stops looking. */
4825 current_thread
= saved_thread
;
4831 current_thread
= saved_thread
;
4834 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4836 lwpid_of (thread
), paddress (pc
));
4841 /* Start a step-over operation on LWP. When LWP stopped at a
4842 breakpoint, to make progress, we need to remove the breakpoint out
4843 of the way. If we let other threads run while we do that, they may
4844 pass by the breakpoint location and miss hitting it. To avoid
4845 that, a step-over momentarily stops all threads while LWP is
4846 single-stepped by either hardware or software while the breakpoint
4847 is temporarily uninserted from the inferior. When the single-step
4848 finishes, we reinsert the breakpoint, and let all threads that are
4849 supposed to be running, run again. */
4852 start_step_over (struct lwp_info
*lwp
)
4854 struct thread_info
*thread
= get_lwp_thread (lwp
);
4855 struct thread_info
*saved_thread
;
4860 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4863 stop_all_lwps (1, lwp
);
4865 if (lwp
->suspended
!= 0)
4867 internal_error (__FILE__
, __LINE__
,
4868 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4873 debug_printf ("Done stopping all threads for step-over.\n");
4875 /* Note, we should always reach here with an already adjusted PC,
4876 either by GDB (if we're resuming due to GDB's request), or by our
4877 caller, if we just finished handling an internal breakpoint GDB
4878 shouldn't care about. */
4881 saved_thread
= current_thread
;
4882 current_thread
= thread
;
4884 lwp
->bp_reinsert
= pc
;
4885 uninsert_breakpoints_at (pc
);
4886 uninsert_fast_tracepoint_jumps_at (pc
);
4888 step
= single_step (lwp
);
4890 current_thread
= saved_thread
;
4892 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4894 /* Require next event from this LWP. */
4895 step_over_bkpt
= thread
->id
;
4899 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4900 start_step_over, if still there, and delete any single-step
4901 breakpoints we've set, on non hardware single-step targets. */
4904 finish_step_over (struct lwp_info
*lwp
)
4906 if (lwp
->bp_reinsert
!= 0)
4908 struct thread_info
*saved_thread
= current_thread
;
4911 debug_printf ("Finished step over.\n");
4913 current_thread
= get_lwp_thread (lwp
);
4915 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4916 may be no breakpoint to reinsert there by now. */
4917 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4918 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4920 lwp
->bp_reinsert
= 0;
4922 /* Delete any single-step breakpoints. No longer needed. We
4923 don't have to worry about other threads hitting this trap,
4924 and later not being able to explain it, because we were
4925 stepping over a breakpoint, and we hold all threads but
4926 LWP stopped while doing that. */
4927 if (!can_hardware_single_step ())
4929 gdb_assert (has_single_step_breakpoints (current_thread
));
4930 delete_single_step_breakpoints (current_thread
);
4933 step_over_bkpt
= null_ptid
;
4934 current_thread
= saved_thread
;
4941 /* If there's a step over in progress, wait until all threads stop
4942 (that is, until the stepping thread finishes its step), and
4943 unsuspend all lwps. The stepping thread ends with its status
4944 pending, which is processed later when we get back to processing
4948 complete_ongoing_step_over (void)
4950 if (!ptid_equal (step_over_bkpt
, null_ptid
))
4952 struct lwp_info
*lwp
;
4957 debug_printf ("detach: step over in progress, finish it first\n");
4959 /* Passing NULL_PTID as filter indicates we want all events to
4960 be left pending. Eventually this returns when there are no
4961 unwaited-for children left. */
4962 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4964 gdb_assert (ret
== -1);
4966 lwp
= find_lwp_pid (step_over_bkpt
);
4968 finish_step_over (lwp
);
4969 step_over_bkpt
= null_ptid
;
4970 unsuspend_all_lwps (lwp
);
4974 /* This function is called once per thread. We check the thread's resume
4975 request, which will tell us whether to resume, step, or leave the thread
4976 stopped; and what signal, if any, it should be sent.
4978 For threads which we aren't explicitly told otherwise, we preserve
4979 the stepping flag; this is used for stepping over gdbserver-placed
4982 If pending_flags was set in any thread, we queue any needed
4983 signals, since we won't actually resume. We already have a pending
4984 event to report, so we don't need to preserve any step requests;
4985 they should be re-issued if necessary. */
4988 linux_resume_one_thread (thread_info
*thread
, void *arg
)
4990 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4991 int leave_all_stopped
= * (int *) arg
;
4994 if (lwp
->resume
== NULL
)
4997 if (lwp
->resume
->kind
== resume_stop
)
5000 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
5005 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
5007 /* Stop the thread, and wait for the event asynchronously,
5008 through the event loop. */
5014 debug_printf ("already stopped LWP %ld\n",
5017 /* The LWP may have been stopped in an internal event that
5018 was not meant to be notified back to GDB (e.g., gdbserver
5019 breakpoint), so we should be reporting a stop event in
5022 /* If the thread already has a pending SIGSTOP, this is a
5023 no-op. Otherwise, something later will presumably resume
5024 the thread and this will cause it to cancel any pending
5025 operation, due to last_resume_kind == resume_stop. If
5026 the thread already has a pending status to report, we
5027 will still report it the next time we wait - see
5028 status_pending_p_callback. */
5030 /* If we already have a pending signal to report, then
5031 there's no need to queue a SIGSTOP, as this means we're
5032 midway through moving the LWP out of the jumppad, and we
5033 will report the pending signal as soon as that is
5035 if (lwp
->pending_signals_to_report
== NULL
)
5039 /* For stop requests, we're done. */
5041 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5045 /* If this thread which is about to be resumed has a pending status,
5046 then don't resume it - we can just report the pending status.
5047 Likewise if it is suspended, because e.g., another thread is
5048 stepping past a breakpoint. Make sure to queue any signals that
5049 would otherwise be sent. In all-stop mode, we do this decision
5050 based on if *any* thread has a pending status. If there's a
5051 thread that needs the step-over-breakpoint dance, then don't
5052 resume any other thread but that particular one. */
5053 leave_pending
= (lwp
->suspended
5054 || lwp
->status_pending_p
5055 || leave_all_stopped
);
5057 /* If we have a new signal, enqueue the signal. */
5058 if (lwp
->resume
->sig
!= 0)
5060 siginfo_t info
, *info_p
;
5062 /* If this is the same signal we were previously stopped by,
5063 make sure to queue its siginfo. */
5064 if (WIFSTOPPED (lwp
->last_status
)
5065 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
5066 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
5067 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
5072 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
5078 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
5080 proceed_one_lwp (thread
, NULL
);
5085 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5088 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5094 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5096 struct thread_info
*need_step_over
= NULL
;
5097 int leave_all_stopped
;
5102 debug_printf ("linux_resume:\n");
5105 for_each_thread ([&] (thread_info
*thread
)
5107 linux_set_resume_request (thread
, resume_info
, n
);
5110 /* If there is a thread which would otherwise be resumed, which has
5111 a pending status, then don't resume any threads - we can just
5112 report the pending status. Make sure to queue any signals that
5113 would otherwise be sent. In non-stop mode, we'll apply this
5114 logic to each thread individually. We consume all pending events
5115 before considering to start a step-over (in all-stop). */
5116 bool any_pending
= false;
5118 any_pending
= find_thread (resume_status_pending_p
) != NULL
;
5120 /* If there is a thread which would otherwise be resumed, which is
5121 stopped at a breakpoint that needs stepping over, then don't
5122 resume any threads - have it step over the breakpoint with all
5123 other threads stopped, then resume all threads again. Make sure
5124 to queue any signals that would otherwise be delivered or
5126 if (!any_pending
&& supports_breakpoints ())
5127 need_step_over
= find_thread (need_step_over_p
);
5129 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5133 if (need_step_over
!= NULL
)
5134 debug_printf ("Not resuming all, need step over\n");
5135 else if (any_pending
)
5136 debug_printf ("Not resuming, all-stop and found "
5137 "an LWP with pending status\n");
5139 debug_printf ("Resuming, no pending status or step over needed\n");
5142 /* Even if we're leaving threads stopped, queue all signals we'd
5143 otherwise deliver. */
5144 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
5147 start_step_over (get_thread_lwp (need_step_over
));
5151 debug_printf ("linux_resume done\n");
5155 /* We may have events that were pending that can/should be sent to
5156 the client now. Trigger a linux_wait call. */
5157 if (target_is_async_p ())
5161 /* This function is called once per thread. We check the thread's
5162 last resume request, which will tell us whether to resume, step, or
5163 leave the thread stopped. Any signal the client requested to be
5164 delivered has already been enqueued at this point.
5166 If any thread that GDB wants running is stopped at an internal
5167 breakpoint that needs stepping over, we start a step-over operation
5168 on that particular thread, and leave all others stopped. */
5171 proceed_one_lwp (thread_info
*thread
, void *except
)
5173 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5180 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5185 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5189 if (thread
->last_resume_kind
== resume_stop
5190 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5193 debug_printf (" client wants LWP to remain %ld stopped\n",
5198 if (lwp
->status_pending_p
)
5201 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5206 gdb_assert (lwp
->suspended
>= 0);
5211 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5215 if (thread
->last_resume_kind
== resume_stop
5216 && lwp
->pending_signals_to_report
== NULL
5217 && (lwp
->collecting_fast_tracepoint
5218 == fast_tpoint_collect_result::not_collecting
))
5220 /* We haven't reported this LWP as stopped yet (otherwise, the
5221 last_status.kind check above would catch it, and we wouldn't
5222 reach here. This LWP may have been momentarily paused by a
5223 stop_all_lwps call while handling for example, another LWP's
5224 step-over. In that case, the pending expected SIGSTOP signal
5225 that was queued at vCont;t handling time will have already
5226 been consumed by wait_for_sigstop, and so we need to requeue
5227 another one here. Note that if the LWP already has a SIGSTOP
5228 pending, this is a no-op. */
5231 debug_printf ("Client wants LWP %ld to stop. "
5232 "Making sure it has a SIGSTOP pending\n",
5238 if (thread
->last_resume_kind
== resume_step
)
5241 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5244 /* If resume_step is requested by GDB, install single-step
5245 breakpoints when the thread is about to be actually resumed if
5246 the single-step breakpoints weren't removed. */
5247 if (can_software_single_step ()
5248 && !has_single_step_breakpoints (thread
))
5249 install_software_single_step_breakpoints (lwp
);
5251 step
= maybe_hw_step (thread
);
5253 else if (lwp
->bp_reinsert
!= 0)
5256 debug_printf (" stepping LWP %ld, reinsert set\n",
5259 step
= maybe_hw_step (thread
);
5264 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5269 unsuspend_and_proceed_one_lwp (thread_info
*thread
, void *except
)
5271 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5276 lwp_suspended_decr (lwp
);
5278 return proceed_one_lwp (thread
, except
);
5281 /* When we finish a step-over, set threads running again. If there's
5282 another thread that may need a step-over, now's the time to start
5283 it. Eventually, we'll move all threads past their breakpoints. */
5286 proceed_all_lwps (void)
5288 struct thread_info
*need_step_over
;
5290 /* If there is a thread which would otherwise be resumed, which is
5291 stopped at a breakpoint that needs stepping over, then don't
5292 resume any threads - have it step over the breakpoint with all
5293 other threads stopped, then resume all threads again. */
5295 if (supports_breakpoints ())
5297 need_step_over
= find_thread (need_step_over_p
);
5299 if (need_step_over
!= NULL
)
5302 debug_printf ("proceed_all_lwps: found "
5303 "thread %ld needing a step-over\n",
5304 lwpid_of (need_step_over
));
5306 start_step_over (get_thread_lwp (need_step_over
));
5312 debug_printf ("Proceeding, no step-over needed\n");
5314 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
5317 /* Stopped LWPs that the client wanted to be running, that don't have
5318 pending statuses, are set to run again, except for EXCEPT, if not
5319 NULL. This undoes a stop_all_lwps call. */
5322 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5328 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5329 lwpid_of (get_lwp_thread (except
)));
5331 debug_printf ("unstopping all lwps\n");
5335 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
5337 find_inferior (&all_threads
, proceed_one_lwp
, except
);
5341 debug_printf ("unstop_all_lwps done\n");
5347 #ifdef HAVE_LINUX_REGSETS
5349 #define use_linux_regsets 1
5351 /* Returns true if REGSET has been disabled. */
5354 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5356 return (info
->disabled_regsets
!= NULL
5357 && info
->disabled_regsets
[regset
- info
->regsets
]);
5360 /* Disable REGSET. */
5363 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5367 dr_offset
= regset
- info
->regsets
;
5368 if (info
->disabled_regsets
== NULL
)
5369 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5370 info
->disabled_regsets
[dr_offset
] = 1;
5374 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5375 struct regcache
*regcache
)
5377 struct regset_info
*regset
;
5378 int saw_general_regs
= 0;
5382 pid
= lwpid_of (current_thread
);
5383 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5388 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5391 buf
= xmalloc (regset
->size
);
5393 nt_type
= regset
->nt_type
;
5397 iov
.iov_len
= regset
->size
;
5398 data
= (void *) &iov
;
5404 res
= ptrace (regset
->get_request
, pid
,
5405 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5407 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5413 /* If we get EIO on a regset, do not try it again for
5414 this process mode. */
5415 disable_regset (regsets_info
, regset
);
5417 else if (errno
== ENODATA
)
5419 /* ENODATA may be returned if the regset is currently
5420 not "active". This can happen in normal operation,
5421 so suppress the warning in this case. */
5423 else if (errno
== ESRCH
)
5425 /* At this point, ESRCH should mean the process is
5426 already gone, in which case we simply ignore attempts
5427 to read its registers. */
5432 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5439 if (regset
->type
== GENERAL_REGS
)
5440 saw_general_regs
= 1;
5441 regset
->store_function (regcache
, buf
);
5445 if (saw_general_regs
)
5452 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5453 struct regcache
*regcache
)
5455 struct regset_info
*regset
;
5456 int saw_general_regs
= 0;
5460 pid
= lwpid_of (current_thread
);
5461 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5466 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5467 || regset
->fill_function
== NULL
)
5470 buf
= xmalloc (regset
->size
);
5472 /* First fill the buffer with the current register set contents,
5473 in case there are any items in the kernel's regset that are
5474 not in gdbserver's regcache. */
5476 nt_type
= regset
->nt_type
;
5480 iov
.iov_len
= regset
->size
;
5481 data
= (void *) &iov
;
5487 res
= ptrace (regset
->get_request
, pid
,
5488 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5490 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5495 /* Then overlay our cached registers on that. */
5496 regset
->fill_function (regcache
, buf
);
5498 /* Only now do we write the register set. */
5500 res
= ptrace (regset
->set_request
, pid
,
5501 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5503 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5511 /* If we get EIO on a regset, do not try it again for
5512 this process mode. */
5513 disable_regset (regsets_info
, regset
);
5515 else if (errno
== ESRCH
)
5517 /* At this point, ESRCH should mean the process is
5518 already gone, in which case we simply ignore attempts
5519 to change its registers. See also the related
5520 comment in linux_resume_one_lwp. */
5526 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5529 else if (regset
->type
== GENERAL_REGS
)
5530 saw_general_regs
= 1;
5533 if (saw_general_regs
)
5539 #else /* !HAVE_LINUX_REGSETS */
5541 #define use_linux_regsets 0
5542 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5543 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5547 /* Return 1 if register REGNO is supported by one of the regset ptrace
5548 calls or 0 if it has to be transferred individually. */
5551 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5553 unsigned char mask
= 1 << (regno
% 8);
5554 size_t index
= regno
/ 8;
5556 return (use_linux_regsets
5557 && (regs_info
->regset_bitmap
== NULL
5558 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5561 #ifdef HAVE_LINUX_USRREGS
5564 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5568 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5569 error ("Invalid register number %d.", regnum
);
5571 addr
= usrregs
->regmap
[regnum
];
5576 /* Fetch one register. */
5578 fetch_register (const struct usrregs_info
*usrregs
,
5579 struct regcache
*regcache
, int regno
)
5586 if (regno
>= usrregs
->num_regs
)
5588 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5591 regaddr
= register_addr (usrregs
, regno
);
5595 size
= ((register_size (regcache
->tdesc
, regno
)
5596 + sizeof (PTRACE_XFER_TYPE
) - 1)
5597 & -sizeof (PTRACE_XFER_TYPE
));
5598 buf
= (char *) alloca (size
);
5600 pid
= lwpid_of (current_thread
);
5601 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5604 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5605 ptrace (PTRACE_PEEKUSER
, pid
,
5606 /* Coerce to a uintptr_t first to avoid potential gcc warning
5607 of coercing an 8 byte integer to a 4 byte pointer. */
5608 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5609 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5611 error ("reading register %d: %s", regno
, strerror (errno
));
5614 if (the_low_target
.supply_ptrace_register
)
5615 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5617 supply_register (regcache
, regno
, buf
);
5620 /* Store one register. */
5622 store_register (const struct usrregs_info
*usrregs
,
5623 struct regcache
*regcache
, int regno
)
5630 if (regno
>= usrregs
->num_regs
)
5632 if ((*the_low_target
.cannot_store_register
) (regno
))
5635 regaddr
= register_addr (usrregs
, regno
);
5639 size
= ((register_size (regcache
->tdesc
, regno
)
5640 + sizeof (PTRACE_XFER_TYPE
) - 1)
5641 & -sizeof (PTRACE_XFER_TYPE
));
5642 buf
= (char *) alloca (size
);
5643 memset (buf
, 0, size
);
5645 if (the_low_target
.collect_ptrace_register
)
5646 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5648 collect_register (regcache
, regno
, buf
);
5650 pid
= lwpid_of (current_thread
);
5651 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5654 ptrace (PTRACE_POKEUSER
, pid
,
5655 /* Coerce to a uintptr_t first to avoid potential gcc warning
5656 about coercing an 8 byte integer to a 4 byte pointer. */
5657 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5658 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5661 /* At this point, ESRCH should mean the process is
5662 already gone, in which case we simply ignore attempts
5663 to change its registers. See also the related
5664 comment in linux_resume_one_lwp. */
5668 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5669 error ("writing register %d: %s", regno
, strerror (errno
));
5671 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5675 /* Fetch all registers, or just one, from the child process.
5676 If REGNO is -1, do this for all registers, skipping any that are
5677 assumed to have been retrieved by regsets_fetch_inferior_registers,
5678 unless ALL is non-zero.
5679 Otherwise, REGNO specifies which register (so we can save time). */
5681 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5682 struct regcache
*regcache
, int regno
, int all
)
5684 struct usrregs_info
*usr
= regs_info
->usrregs
;
5688 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5689 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5690 fetch_register (usr
, regcache
, regno
);
5693 fetch_register (usr
, regcache
, regno
);
5696 /* Store our register values back into the inferior.
5697 If REGNO is -1, do this for all registers, skipping any that are
5698 assumed to have been saved by regsets_store_inferior_registers,
5699 unless ALL is non-zero.
5700 Otherwise, REGNO specifies which register (so we can save time). */
5702 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5703 struct regcache
*regcache
, int regno
, int all
)
5705 struct usrregs_info
*usr
= regs_info
->usrregs
;
5709 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5710 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5711 store_register (usr
, regcache
, regno
);
5714 store_register (usr
, regcache
, regno
);
5717 #else /* !HAVE_LINUX_USRREGS */
5719 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5720 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5726 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5730 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5734 if (the_low_target
.fetch_register
!= NULL
5735 && regs_info
->usrregs
!= NULL
)
5736 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5737 (*the_low_target
.fetch_register
) (regcache
, regno
);
5739 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5740 if (regs_info
->usrregs
!= NULL
)
5741 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5745 if (the_low_target
.fetch_register
!= NULL
5746 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5749 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5751 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5753 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5754 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5759 linux_store_registers (struct regcache
*regcache
, int regno
)
5763 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5767 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5769 if (regs_info
->usrregs
!= NULL
)
5770 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5774 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5776 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5778 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5779 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5784 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5785 to debugger memory starting at MYADDR. */
5788 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5790 int pid
= lwpid_of (current_thread
);
5791 PTRACE_XFER_TYPE
*buffer
;
5799 /* Try using /proc. Don't bother for one word. */
5800 if (len
>= 3 * sizeof (long))
5804 /* We could keep this file open and cache it - possibly one per
5805 thread. That requires some juggling, but is even faster. */
5806 sprintf (filename
, "/proc/%d/mem", pid
);
5807 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5811 /* If pread64 is available, use it. It's faster if the kernel
5812 supports it (only one syscall), and it's 64-bit safe even on
5813 32-bit platforms (for instance, SPARC debugging a SPARC64
5816 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5819 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5820 bytes
= read (fd
, myaddr
, len
);
5827 /* Some data was read, we'll try to get the rest with ptrace. */
5837 /* Round starting address down to longword boundary. */
5838 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5839 /* Round ending address up; get number of longwords that makes. */
5840 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5841 / sizeof (PTRACE_XFER_TYPE
));
5842 /* Allocate buffer of that many longwords. */
5843 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5845 /* Read all the longwords */
5847 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5849 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5850 about coercing an 8 byte integer to a 4 byte pointer. */
5851 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5852 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5853 (PTRACE_TYPE_ARG4
) 0);
5859 /* Copy appropriate bytes out of the buffer. */
5862 i
*= sizeof (PTRACE_XFER_TYPE
);
5863 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5865 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5872 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5873 memory at MEMADDR. On failure (cannot write to the inferior)
5874 returns the value of errno. Always succeeds if LEN is zero. */
5877 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5880 /* Round starting address down to longword boundary. */
5881 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5882 /* Round ending address up; get number of longwords that makes. */
5884 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5885 / sizeof (PTRACE_XFER_TYPE
);
5887 /* Allocate buffer of that many longwords. */
5888 PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5890 int pid
= lwpid_of (current_thread
);
5894 /* Zero length write always succeeds. */
5900 /* Dump up to four bytes. */
5901 char str
[4 * 2 + 1];
5903 int dump
= len
< 4 ? len
: 4;
5905 for (i
= 0; i
< dump
; i
++)
5907 sprintf (p
, "%02x", myaddr
[i
]);
5912 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5913 str
, (long) memaddr
, pid
);
5916 /* Fill start and end extra bytes of buffer with existing memory data. */
5919 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5920 about coercing an 8 byte integer to a 4 byte pointer. */
5921 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5922 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5923 (PTRACE_TYPE_ARG4
) 0);
5931 = ptrace (PTRACE_PEEKTEXT
, pid
,
5932 /* Coerce to a uintptr_t first to avoid potential gcc warning
5933 about coercing an 8 byte integer to a 4 byte pointer. */
5934 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5935 * sizeof (PTRACE_XFER_TYPE
)),
5936 (PTRACE_TYPE_ARG4
) 0);
5941 /* Copy data to be written over corresponding part of buffer. */
5943 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5946 /* Write the entire buffer. */
5948 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5951 ptrace (PTRACE_POKETEXT
, pid
,
5952 /* Coerce to a uintptr_t first to avoid potential gcc warning
5953 about coercing an 8 byte integer to a 4 byte pointer. */
5954 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5955 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5964 linux_look_up_symbols (void)
5966 #ifdef USE_THREAD_DB
5967 struct process_info
*proc
= current_process ();
5969 if (proc
->priv
->thread_db
!= NULL
)
5977 linux_request_interrupt (void)
5979 /* Send a SIGINT to the process group. This acts just like the user
5980 typed a ^C on the controlling terminal. */
5981 kill (-signal_pid
, SIGINT
);
5984 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5985 to debugger memory starting at MYADDR. */
5988 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5990 char filename
[PATH_MAX
];
5992 int pid
= lwpid_of (current_thread
);
5994 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5996 fd
= open (filename
, O_RDONLY
);
6000 if (offset
!= (CORE_ADDR
) 0
6001 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6004 n
= read (fd
, myaddr
, len
);
6011 /* These breakpoint and watchpoint related wrapper functions simply
6012 pass on the function call if the target has registered a
6013 corresponding function. */
6016 linux_supports_z_point_type (char z_type
)
6018 return (the_low_target
.supports_z_point_type
!= NULL
6019 && the_low_target
.supports_z_point_type (z_type
));
6023 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6024 int size
, struct raw_breakpoint
*bp
)
6026 if (type
== raw_bkpt_type_sw
)
6027 return insert_memory_breakpoint (bp
);
6028 else if (the_low_target
.insert_point
!= NULL
)
6029 return the_low_target
.insert_point (type
, addr
, size
, bp
);
6031 /* Unsupported (see target.h). */
6036 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6037 int size
, struct raw_breakpoint
*bp
)
6039 if (type
== raw_bkpt_type_sw
)
6040 return remove_memory_breakpoint (bp
);
6041 else if (the_low_target
.remove_point
!= NULL
)
6042 return the_low_target
.remove_point (type
, addr
, size
, bp
);
6044 /* Unsupported (see target.h). */
6048 /* Implement the to_stopped_by_sw_breakpoint target_ops
6052 linux_stopped_by_sw_breakpoint (void)
6054 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6056 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
6059 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
6063 linux_supports_stopped_by_sw_breakpoint (void)
6065 return USE_SIGTRAP_SIGINFO
;
6068 /* Implement the to_stopped_by_hw_breakpoint target_ops
6072 linux_stopped_by_hw_breakpoint (void)
6074 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6076 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6079 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6083 linux_supports_stopped_by_hw_breakpoint (void)
6085 return USE_SIGTRAP_SIGINFO
;
6088 /* Implement the supports_hardware_single_step target_ops method. */
6091 linux_supports_hardware_single_step (void)
6093 return can_hardware_single_step ();
6097 linux_supports_software_single_step (void)
6099 return can_software_single_step ();
6103 linux_stopped_by_watchpoint (void)
6105 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6107 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6111 linux_stopped_data_address (void)
6113 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6115 return lwp
->stopped_data_address
;
6118 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6119 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6120 && defined(PT_TEXT_END_ADDR)
6122 /* This is only used for targets that define PT_TEXT_ADDR,
6123 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6124 the target has different ways of acquiring this information, like
6127 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6128 to tell gdb about. */
6131 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6133 unsigned long text
, text_end
, data
;
6134 int pid
= lwpid_of (current_thread
);
6138 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6139 (PTRACE_TYPE_ARG4
) 0);
6140 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6141 (PTRACE_TYPE_ARG4
) 0);
6142 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6143 (PTRACE_TYPE_ARG4
) 0);
6147 /* Both text and data offsets produced at compile-time (and so
6148 used by gdb) are relative to the beginning of the program,
6149 with the data segment immediately following the text segment.
6150 However, the actual runtime layout in memory may put the data
6151 somewhere else, so when we send gdb a data base-address, we
6152 use the real data base address and subtract the compile-time
6153 data base-address from it (which is just the length of the
6154 text segment). BSS immediately follows data in both
6157 *data_p
= data
- (text_end
- text
);
6166 linux_qxfer_osdata (const char *annex
,
6167 unsigned char *readbuf
, unsigned const char *writebuf
,
6168 CORE_ADDR offset
, int len
)
6170 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6173 /* Convert a native/host siginfo object, into/from the siginfo in the
6174 layout of the inferiors' architecture. */
6177 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6181 if (the_low_target
.siginfo_fixup
!= NULL
)
6182 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6184 /* If there was no callback, or the callback didn't do anything,
6185 then just do a straight memcpy. */
6189 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6191 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6196 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6197 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6201 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6203 if (current_thread
== NULL
)
6206 pid
= lwpid_of (current_thread
);
6209 debug_printf ("%s siginfo for lwp %d.\n",
6210 readbuf
!= NULL
? "Reading" : "Writing",
6213 if (offset
>= sizeof (siginfo
))
6216 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6219 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6220 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6221 inferior with a 64-bit GDBSERVER should look the same as debugging it
6222 with a 32-bit GDBSERVER, we need to convert it. */
6223 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6225 if (offset
+ len
> sizeof (siginfo
))
6226 len
= sizeof (siginfo
) - offset
;
6228 if (readbuf
!= NULL
)
6229 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6232 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6234 /* Convert back to ptrace layout before flushing it out. */
6235 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6237 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6244 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6245 so we notice when children change state; as the handler for the
6246 sigsuspend in my_waitpid. */
6249 sigchld_handler (int signo
)
6251 int old_errno
= errno
;
6257 /* fprintf is not async-signal-safe, so call write
6259 if (write (2, "sigchld_handler\n",
6260 sizeof ("sigchld_handler\n") - 1) < 0)
6261 break; /* just ignore */
6265 if (target_is_async_p ())
6266 async_file_mark (); /* trigger a linux_wait */
6272 linux_supports_non_stop (void)
6278 linux_async (int enable
)
6280 int previous
= target_is_async_p ();
6283 debug_printf ("linux_async (%d), previous=%d\n",
6286 if (previous
!= enable
)
6289 sigemptyset (&mask
);
6290 sigaddset (&mask
, SIGCHLD
);
6292 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6296 if (pipe (linux_event_pipe
) == -1)
6298 linux_event_pipe
[0] = -1;
6299 linux_event_pipe
[1] = -1;
6300 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6302 warning ("creating event pipe failed.");
6306 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6307 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6309 /* Register the event loop handler. */
6310 add_file_handler (linux_event_pipe
[0],
6311 handle_target_event
, NULL
);
6313 /* Always trigger a linux_wait. */
6318 delete_file_handler (linux_event_pipe
[0]);
6320 close (linux_event_pipe
[0]);
6321 close (linux_event_pipe
[1]);
6322 linux_event_pipe
[0] = -1;
6323 linux_event_pipe
[1] = -1;
6326 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6333 linux_start_non_stop (int nonstop
)
6335 /* Register or unregister from event-loop accordingly. */
6336 linux_async (nonstop
);
6338 if (target_is_async_p () != (nonstop
!= 0))
6345 linux_supports_multi_process (void)
6350 /* Check if fork events are supported. */
6353 linux_supports_fork_events (void)
6355 return linux_supports_tracefork ();
6358 /* Check if vfork events are supported. */
6361 linux_supports_vfork_events (void)
6363 return linux_supports_tracefork ();
6366 /* Check if exec events are supported. */
6369 linux_supports_exec_events (void)
6371 return linux_supports_traceexec ();
6374 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6375 ptrace flags for all inferiors. This is in case the new GDB connection
6376 doesn't support the same set of events that the previous one did. */
6379 linux_handle_new_gdb_connection (void)
6381 /* Request that all the lwps reset their ptrace options. */
6382 for_each_thread ([] (thread_info
*thread
)
6384 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6388 /* Stop the lwp so we can modify its ptrace options. */
6389 lwp
->must_set_ptrace_flags
= 1;
6390 linux_stop_lwp (lwp
);
6394 /* Already stopped; go ahead and set the ptrace options. */
6395 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6396 int options
= linux_low_ptrace_options (proc
->attached
);
6398 linux_enable_event_reporting (lwpid_of (thread
), options
);
6399 lwp
->must_set_ptrace_flags
= 0;
6405 linux_supports_disable_randomization (void)
6407 #ifdef HAVE_PERSONALITY
6415 linux_supports_agent (void)
6421 linux_supports_range_stepping (void)
6423 if (can_software_single_step ())
6425 if (*the_low_target
.supports_range_stepping
== NULL
)
6428 return (*the_low_target
.supports_range_stepping
) ();
6431 /* Enumerate spufs IDs for process PID. */
6433 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6439 struct dirent
*entry
;
6441 sprintf (path
, "/proc/%ld/fd", pid
);
6442 dir
= opendir (path
);
6447 while ((entry
= readdir (dir
)) != NULL
)
6453 fd
= atoi (entry
->d_name
);
6457 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6458 if (stat (path
, &st
) != 0)
6460 if (!S_ISDIR (st
.st_mode
))
6463 if (statfs (path
, &stfs
) != 0)
6465 if (stfs
.f_type
!= SPUFS_MAGIC
)
6468 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6470 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6480 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6481 object type, using the /proc file system. */
6483 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6484 unsigned const char *writebuf
,
6485 CORE_ADDR offset
, int len
)
6487 long pid
= lwpid_of (current_thread
);
6492 if (!writebuf
&& !readbuf
)
6500 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6503 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6504 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6509 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6516 ret
= write (fd
, writebuf
, (size_t) len
);
6518 ret
= read (fd
, readbuf
, (size_t) len
);
6524 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6525 struct target_loadseg
6527 /* Core address to which the segment is mapped. */
6529 /* VMA recorded in the program header. */
6531 /* Size of this segment in memory. */
6535 # if defined PT_GETDSBT
6536 struct target_loadmap
6538 /* Protocol version number, must be zero. */
6540 /* Pointer to the DSBT table, its size, and the DSBT index. */
6541 unsigned *dsbt_table
;
6542 unsigned dsbt_size
, dsbt_index
;
6543 /* Number of segments in this map. */
6545 /* The actual memory map. */
6546 struct target_loadseg segs
[/*nsegs*/];
6548 # define LINUX_LOADMAP PT_GETDSBT
6549 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6550 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6552 struct target_loadmap
6554 /* Protocol version number, must be zero. */
6556 /* Number of segments in this map. */
6558 /* The actual memory map. */
6559 struct target_loadseg segs
[/*nsegs*/];
6561 # define LINUX_LOADMAP PTRACE_GETFDPIC
6562 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6563 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6567 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6568 unsigned char *myaddr
, unsigned int len
)
6570 int pid
= lwpid_of (current_thread
);
6572 struct target_loadmap
*data
= NULL
;
6573 unsigned int actual_length
, copy_length
;
6575 if (strcmp (annex
, "exec") == 0)
6576 addr
= (int) LINUX_LOADMAP_EXEC
;
6577 else if (strcmp (annex
, "interp") == 0)
6578 addr
= (int) LINUX_LOADMAP_INTERP
;
6582 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6588 actual_length
= sizeof (struct target_loadmap
)
6589 + sizeof (struct target_loadseg
) * data
->nsegs
;
6591 if (offset
< 0 || offset
> actual_length
)
6594 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6595 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6599 # define linux_read_loadmap NULL
6600 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6603 linux_process_qsupported (char **features
, int count
)
6605 if (the_low_target
.process_qsupported
!= NULL
)
6606 the_low_target
.process_qsupported (features
, count
);
6610 linux_supports_catch_syscall (void)
6612 return (the_low_target
.get_syscall_trapinfo
!= NULL
6613 && linux_supports_tracesysgood ());
6617 linux_get_ipa_tdesc_idx (void)
6619 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6622 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6626 linux_supports_tracepoints (void)
6628 if (*the_low_target
.supports_tracepoints
== NULL
)
6631 return (*the_low_target
.supports_tracepoints
) ();
6635 linux_read_pc (struct regcache
*regcache
)
6637 if (the_low_target
.get_pc
== NULL
)
6640 return (*the_low_target
.get_pc
) (regcache
);
6644 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6646 gdb_assert (the_low_target
.set_pc
!= NULL
);
6648 (*the_low_target
.set_pc
) (regcache
, pc
);
6652 linux_thread_stopped (struct thread_info
*thread
)
6654 return get_thread_lwp (thread
)->stopped
;
6657 /* This exposes stop-all-threads functionality to other modules. */
6660 linux_pause_all (int freeze
)
6662 stop_all_lwps (freeze
, NULL
);
6665 /* This exposes unstop-all-threads functionality to other gdbserver
6669 linux_unpause_all (int unfreeze
)
6671 unstop_all_lwps (unfreeze
, NULL
);
6675 linux_prepare_to_access_memory (void)
6677 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6680 linux_pause_all (1);
6685 linux_done_accessing_memory (void)
6687 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6690 linux_unpause_all (1);
6694 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6695 CORE_ADDR collector
,
6698 CORE_ADDR
*jump_entry
,
6699 CORE_ADDR
*trampoline
,
6700 ULONGEST
*trampoline_size
,
6701 unsigned char *jjump_pad_insn
,
6702 ULONGEST
*jjump_pad_insn_size
,
6703 CORE_ADDR
*adjusted_insn_addr
,
6704 CORE_ADDR
*adjusted_insn_addr_end
,
6707 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6708 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6709 jump_entry
, trampoline
, trampoline_size
,
6710 jjump_pad_insn
, jjump_pad_insn_size
,
6711 adjusted_insn_addr
, adjusted_insn_addr_end
,
6715 static struct emit_ops
*
6716 linux_emit_ops (void)
6718 if (the_low_target
.emit_ops
!= NULL
)
6719 return (*the_low_target
.emit_ops
) ();
6725 linux_get_min_fast_tracepoint_insn_len (void)
6727 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6730 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6733 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6734 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6736 char filename
[PATH_MAX
];
6738 const int auxv_size
= is_elf64
6739 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6740 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6742 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6744 fd
= open (filename
, O_RDONLY
);
6750 while (read (fd
, buf
, auxv_size
) == auxv_size
6751 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6755 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6757 switch (aux
->a_type
)
6760 *phdr_memaddr
= aux
->a_un
.a_val
;
6763 *num_phdr
= aux
->a_un
.a_val
;
6769 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6771 switch (aux
->a_type
)
6774 *phdr_memaddr
= aux
->a_un
.a_val
;
6777 *num_phdr
= aux
->a_un
.a_val
;
6785 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6787 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6788 "phdr_memaddr = %ld, phdr_num = %d",
6789 (long) *phdr_memaddr
, *num_phdr
);
6796 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6799 get_dynamic (const int pid
, const int is_elf64
)
6801 CORE_ADDR phdr_memaddr
, relocation
;
6803 unsigned char *phdr_buf
;
6804 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6806 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6809 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6810 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6812 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6815 /* Compute relocation: it is expected to be 0 for "regular" executables,
6816 non-zero for PIE ones. */
6818 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6821 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6823 if (p
->p_type
== PT_PHDR
)
6824 relocation
= phdr_memaddr
- p
->p_vaddr
;
6828 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6830 if (p
->p_type
== PT_PHDR
)
6831 relocation
= phdr_memaddr
- p
->p_vaddr
;
6834 if (relocation
== -1)
6836 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6837 any real world executables, including PIE executables, have always
6838 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6839 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6840 or present DT_DEBUG anyway (fpc binaries are statically linked).
6842 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6844 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6849 for (i
= 0; i
< num_phdr
; i
++)
6853 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6855 if (p
->p_type
== PT_DYNAMIC
)
6856 return p
->p_vaddr
+ relocation
;
6860 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6862 if (p
->p_type
== PT_DYNAMIC
)
6863 return p
->p_vaddr
+ relocation
;
6870 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6871 can be 0 if the inferior does not yet have the library list initialized.
6872 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6873 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6876 get_r_debug (const int pid
, const int is_elf64
)
6878 CORE_ADDR dynamic_memaddr
;
6879 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6880 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6883 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6884 if (dynamic_memaddr
== 0)
6887 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6891 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6892 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6896 unsigned char buf
[sizeof (Elf64_Xword
)];
6900 #ifdef DT_MIPS_RLD_MAP
6901 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6903 if (linux_read_memory (dyn
->d_un
.d_val
,
6904 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6909 #endif /* DT_MIPS_RLD_MAP */
6910 #ifdef DT_MIPS_RLD_MAP_REL
6911 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6913 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6914 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6919 #endif /* DT_MIPS_RLD_MAP_REL */
6921 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6922 map
= dyn
->d_un
.d_val
;
6924 if (dyn
->d_tag
== DT_NULL
)
6929 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6930 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6934 unsigned char buf
[sizeof (Elf32_Word
)];
6938 #ifdef DT_MIPS_RLD_MAP
6939 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6941 if (linux_read_memory (dyn
->d_un
.d_val
,
6942 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6947 #endif /* DT_MIPS_RLD_MAP */
6948 #ifdef DT_MIPS_RLD_MAP_REL
6949 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6951 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6952 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6957 #endif /* DT_MIPS_RLD_MAP_REL */
6959 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6960 map
= dyn
->d_un
.d_val
;
6962 if (dyn
->d_tag
== DT_NULL
)
6966 dynamic_memaddr
+= dyn_size
;
6972 /* Read one pointer from MEMADDR in the inferior. */
6975 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6979 /* Go through a union so this works on either big or little endian
6980 hosts, when the inferior's pointer size is smaller than the size
6981 of CORE_ADDR. It is assumed the inferior's endianness is the
6982 same of the superior's. */
6985 CORE_ADDR core_addr
;
6990 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6993 if (ptr_size
== sizeof (CORE_ADDR
))
6994 *ptr
= addr
.core_addr
;
6995 else if (ptr_size
== sizeof (unsigned int))
6998 gdb_assert_not_reached ("unhandled pointer size");
7003 struct link_map_offsets
7005 /* Offset and size of r_debug.r_version. */
7006 int r_version_offset
;
7008 /* Offset and size of r_debug.r_map. */
7011 /* Offset to l_addr field in struct link_map. */
7014 /* Offset to l_name field in struct link_map. */
7017 /* Offset to l_ld field in struct link_map. */
7020 /* Offset to l_next field in struct link_map. */
7023 /* Offset to l_prev field in struct link_map. */
7027 /* Construct qXfer:libraries-svr4:read reply. */
7030 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
7031 unsigned const char *writebuf
,
7032 CORE_ADDR offset
, int len
)
7035 unsigned document_len
;
7036 struct process_info_private
*const priv
= current_process ()->priv
;
7037 char filename
[PATH_MAX
];
7040 static const struct link_map_offsets lmo_32bit_offsets
=
7042 0, /* r_version offset. */
7043 4, /* r_debug.r_map offset. */
7044 0, /* l_addr offset in link_map. */
7045 4, /* l_name offset in link_map. */
7046 8, /* l_ld offset in link_map. */
7047 12, /* l_next offset in link_map. */
7048 16 /* l_prev offset in link_map. */
7051 static const struct link_map_offsets lmo_64bit_offsets
=
7053 0, /* r_version offset. */
7054 8, /* r_debug.r_map offset. */
7055 0, /* l_addr offset in link_map. */
7056 8, /* l_name offset in link_map. */
7057 16, /* l_ld offset in link_map. */
7058 24, /* l_next offset in link_map. */
7059 32 /* l_prev offset in link_map. */
7061 const struct link_map_offsets
*lmo
;
7062 unsigned int machine
;
7064 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7065 int allocated
= 1024;
7067 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7068 int header_done
= 0;
7070 if (writebuf
!= NULL
)
7072 if (readbuf
== NULL
)
7075 pid
= lwpid_of (current_thread
);
7076 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7077 is_elf64
= elf_64_file_p (filename
, &machine
);
7078 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7079 ptr_size
= is_elf64
? 8 : 4;
7081 while (annex
[0] != '\0')
7087 sep
= strchr (annex
, '=');
7092 if (len
== 5 && startswith (annex
, "start"))
7094 else if (len
== 4 && startswith (annex
, "prev"))
7098 annex
= strchr (sep
, ';');
7105 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7112 if (priv
->r_debug
== 0)
7113 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7115 /* We failed to find DT_DEBUG. Such situation will not change
7116 for this inferior - do not retry it. Report it to GDB as
7117 E01, see for the reasons at the GDB solib-svr4.c side. */
7118 if (priv
->r_debug
== (CORE_ADDR
) -1)
7121 if (priv
->r_debug
!= 0)
7123 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7124 (unsigned char *) &r_version
,
7125 sizeof (r_version
)) != 0
7128 warning ("unexpected r_debug version %d", r_version
);
7130 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7131 &lm_addr
, ptr_size
) != 0)
7133 warning ("unable to read r_map from 0x%lx",
7134 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7139 document
= (char *) xmalloc (allocated
);
7140 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7141 p
= document
+ strlen (document
);
7144 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7145 &l_name
, ptr_size
) == 0
7146 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7147 &l_addr
, ptr_size
) == 0
7148 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7149 &l_ld
, ptr_size
) == 0
7150 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7151 &l_prev
, ptr_size
) == 0
7152 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7153 &l_next
, ptr_size
) == 0)
7155 unsigned char libname
[PATH_MAX
];
7157 if (lm_prev
!= l_prev
)
7159 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7160 (long) lm_prev
, (long) l_prev
);
7164 /* Ignore the first entry even if it has valid name as the first entry
7165 corresponds to the main executable. The first entry should not be
7166 skipped if the dynamic loader was loaded late by a static executable
7167 (see solib-svr4.c parameter ignore_first). But in such case the main
7168 executable does not have PT_DYNAMIC present and this function already
7169 exited above due to failed get_r_debug. */
7172 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7177 /* Not checking for error because reading may stop before
7178 we've got PATH_MAX worth of characters. */
7180 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7181 libname
[sizeof (libname
) - 1] = '\0';
7182 if (libname
[0] != '\0')
7184 /* 6x the size for xml_escape_text below. */
7185 size_t len
= 6 * strlen ((char *) libname
);
7189 /* Terminate `<library-list-svr4'. */
7194 while (allocated
< p
- document
+ len
+ 200)
7196 /* Expand to guarantee sufficient storage. */
7197 uintptr_t document_len
= p
- document
;
7199 document
= (char *) xrealloc (document
, 2 * allocated
);
7201 p
= document
+ document_len
;
7204 std::string name
= xml_escape_text ((char *) libname
);
7205 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7206 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7207 name
.c_str (), (unsigned long) lm_addr
,
7208 (unsigned long) l_addr
, (unsigned long) l_ld
);
7218 /* Empty list; terminate `<library-list-svr4'. */
7222 strcpy (p
, "</library-list-svr4>");
7224 document_len
= strlen (document
);
7225 if (offset
< document_len
)
7226 document_len
-= offset
;
7229 if (len
> document_len
)
7232 memcpy (readbuf
, document
+ offset
, len
);
7238 #ifdef HAVE_LINUX_BTRACE
7240 /* See to_disable_btrace target method. */
7243 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7245 enum btrace_error err
;
7247 err
= linux_disable_btrace (tinfo
);
7248 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7251 /* Encode an Intel Processor Trace configuration. */
7254 linux_low_encode_pt_config (struct buffer
*buffer
,
7255 const struct btrace_data_pt_config
*config
)
7257 buffer_grow_str (buffer
, "<pt-config>\n");
7259 switch (config
->cpu
.vendor
)
7262 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7263 "model=\"%u\" stepping=\"%u\"/>\n",
7264 config
->cpu
.family
, config
->cpu
.model
,
7265 config
->cpu
.stepping
);
7272 buffer_grow_str (buffer
, "</pt-config>\n");
7275 /* Encode a raw buffer. */
7278 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7284 /* We use hex encoding - see common/rsp-low.h. */
7285 buffer_grow_str (buffer
, "<raw>\n");
7291 elem
[0] = tohex ((*data
>> 4) & 0xf);
7292 elem
[1] = tohex (*data
++ & 0xf);
7294 buffer_grow (buffer
, elem
, 2);
7297 buffer_grow_str (buffer
, "</raw>\n");
7300 /* See to_read_btrace target method. */
7303 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7304 enum btrace_read_type type
)
7306 struct btrace_data btrace
;
7307 struct btrace_block
*block
;
7308 enum btrace_error err
;
7311 btrace_data_init (&btrace
);
7313 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7314 if (err
!= BTRACE_ERR_NONE
)
7316 if (err
== BTRACE_ERR_OVERFLOW
)
7317 buffer_grow_str0 (buffer
, "E.Overflow.");
7319 buffer_grow_str0 (buffer
, "E.Generic Error.");
7324 switch (btrace
.format
)
7326 case BTRACE_FORMAT_NONE
:
7327 buffer_grow_str0 (buffer
, "E.No Trace.");
7330 case BTRACE_FORMAT_BTS
:
7331 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7332 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7335 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7337 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7338 paddress (block
->begin
), paddress (block
->end
));
7340 buffer_grow_str0 (buffer
, "</btrace>\n");
7343 case BTRACE_FORMAT_PT
:
7344 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7345 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7346 buffer_grow_str (buffer
, "<pt>\n");
7348 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7350 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7351 btrace
.variant
.pt
.size
);
7353 buffer_grow_str (buffer
, "</pt>\n");
7354 buffer_grow_str0 (buffer
, "</btrace>\n");
7358 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7362 btrace_data_fini (&btrace
);
7366 btrace_data_fini (&btrace
);
7370 /* See to_btrace_conf target method. */
7373 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7374 struct buffer
*buffer
)
7376 const struct btrace_config
*conf
;
7378 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7379 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7381 conf
= linux_btrace_conf (tinfo
);
7384 switch (conf
->format
)
7386 case BTRACE_FORMAT_NONE
:
7389 case BTRACE_FORMAT_BTS
:
7390 buffer_xml_printf (buffer
, "<bts");
7391 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7392 buffer_xml_printf (buffer
, " />\n");
7395 case BTRACE_FORMAT_PT
:
7396 buffer_xml_printf (buffer
, "<pt");
7397 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7398 buffer_xml_printf (buffer
, "/>\n");
7403 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7406 #endif /* HAVE_LINUX_BTRACE */
7408 /* See nat/linux-nat.h. */
7411 current_lwp_ptid (void)
7413 return ptid_of (current_thread
);
7416 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7419 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7421 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7422 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7424 return default_breakpoint_kind_from_pc (pcptr
);
7427 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7429 static const gdb_byte
*
7430 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7432 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7434 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7437 /* Implementation of the target_ops method
7438 "breakpoint_kind_from_current_state". */
7441 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7443 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7444 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7446 return linux_breakpoint_kind_from_pc (pcptr
);
7449 /* Default implementation of linux_target_ops method "set_pc" for
7450 32-bit pc register which is literally named "pc". */
7453 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7455 uint32_t newpc
= pc
;
7457 supply_register_by_name (regcache
, "pc", &newpc
);
7460 /* Default implementation of linux_target_ops method "get_pc" for
7461 32-bit pc register which is literally named "pc". */
7464 linux_get_pc_32bit (struct regcache
*regcache
)
7468 collect_register_by_name (regcache
, "pc", &pc
);
7470 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7474 /* Default implementation of linux_target_ops method "set_pc" for
7475 64-bit pc register which is literally named "pc". */
7478 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7480 uint64_t newpc
= pc
;
7482 supply_register_by_name (regcache
, "pc", &newpc
);
7485 /* Default implementation of linux_target_ops method "get_pc" for
7486 64-bit pc register which is literally named "pc". */
7489 linux_get_pc_64bit (struct regcache
*regcache
)
7493 collect_register_by_name (regcache
, "pc", &pc
);
7495 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7500 static struct target_ops linux_target_ops
= {
7501 linux_create_inferior
,
7502 linux_post_create_inferior
,
7511 linux_fetch_registers
,
7512 linux_store_registers
,
7513 linux_prepare_to_access_memory
,
7514 linux_done_accessing_memory
,
7517 linux_look_up_symbols
,
7518 linux_request_interrupt
,
7520 linux_supports_z_point_type
,
7523 linux_stopped_by_sw_breakpoint
,
7524 linux_supports_stopped_by_sw_breakpoint
,
7525 linux_stopped_by_hw_breakpoint
,
7526 linux_supports_stopped_by_hw_breakpoint
,
7527 linux_supports_hardware_single_step
,
7528 linux_stopped_by_watchpoint
,
7529 linux_stopped_data_address
,
7530 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7531 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7532 && defined(PT_TEXT_END_ADDR)
7537 #ifdef USE_THREAD_DB
7538 thread_db_get_tls_address
,
7543 hostio_last_error_from_errno
,
7546 linux_supports_non_stop
,
7548 linux_start_non_stop
,
7549 linux_supports_multi_process
,
7550 linux_supports_fork_events
,
7551 linux_supports_vfork_events
,
7552 linux_supports_exec_events
,
7553 linux_handle_new_gdb_connection
,
7554 #ifdef USE_THREAD_DB
7555 thread_db_handle_monitor_command
,
7559 linux_common_core_of_thread
,
7561 linux_process_qsupported
,
7562 linux_supports_tracepoints
,
7565 linux_thread_stopped
,
7569 linux_stabilize_threads
,
7570 linux_install_fast_tracepoint_jump_pad
,
7572 linux_supports_disable_randomization
,
7573 linux_get_min_fast_tracepoint_insn_len
,
7574 linux_qxfer_libraries_svr4
,
7575 linux_supports_agent
,
7576 #ifdef HAVE_LINUX_BTRACE
7577 linux_supports_btrace
,
7578 linux_enable_btrace
,
7579 linux_low_disable_btrace
,
7580 linux_low_read_btrace
,
7581 linux_low_btrace_conf
,
7589 linux_supports_range_stepping
,
7590 linux_proc_pid_to_exec_file
,
7591 linux_mntns_open_cloexec
,
7593 linux_mntns_readlink
,
7594 linux_breakpoint_kind_from_pc
,
7595 linux_sw_breakpoint_from_kind
,
7596 linux_proc_tid_get_name
,
7597 linux_breakpoint_kind_from_current_state
,
7598 linux_supports_software_single_step
,
7599 linux_supports_catch_syscall
,
7600 linux_get_ipa_tdesc_idx
,
7602 thread_db_thread_handle
,
7608 #ifdef HAVE_LINUX_REGSETS
7610 initialize_regsets_info (struct regsets_info
*info
)
7612 for (info
->num_regsets
= 0;
7613 info
->regsets
[info
->num_regsets
].size
>= 0;
7614 info
->num_regsets
++)
7620 initialize_low (void)
7622 struct sigaction sigchld_action
;
7624 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7625 set_target_ops (&linux_target_ops
);
7627 linux_ptrace_init_warnings ();
7629 sigchld_action
.sa_handler
= sigchld_handler
;
7630 sigemptyset (&sigchld_action
.sa_mask
);
7631 sigchld_action
.sa_flags
= SA_RESTART
;
7632 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7634 initialize_low_arch ();
7636 linux_check_ptrace_features ();