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
;
1001 struct cleanup
*restore_personality
1002 = maybe_disable_address_space_randomization (disable_randomization
);
1003 std::string str_program_args
= stringify_argv (program_args
);
1005 pid
= fork_inferior (program
,
1006 str_program_args
.c_str (),
1007 get_environ ()->envp (), linux_ptrace_fun
,
1008 NULL
, NULL
, NULL
, NULL
);
1010 do_cleanups (restore_personality
);
1012 linux_add_process (pid
, 0);
1014 ptid
= ptid_build (pid
, pid
, 0);
1015 new_lwp
= add_lwp (ptid
);
1016 new_lwp
->must_set_ptrace_flags
= 1;
1018 post_fork_inferior (pid
, program
);
1023 /* Implement the post_create_inferior target_ops method. */
1026 linux_post_create_inferior (void)
1028 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
1030 linux_arch_setup ();
1032 if (lwp
->must_set_ptrace_flags
)
1034 struct process_info
*proc
= current_process ();
1035 int options
= linux_low_ptrace_options (proc
->attached
);
1037 linux_enable_event_reporting (lwpid_of (current_thread
), options
);
1038 lwp
->must_set_ptrace_flags
= 0;
1042 /* Attach to an inferior process. Returns 0 on success, ERRNO on
1046 linux_attach_lwp (ptid_t ptid
)
1048 struct lwp_info
*new_lwp
;
1049 int lwpid
= ptid_get_lwp (ptid
);
1051 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
1055 new_lwp
= add_lwp (ptid
);
1057 /* We need to wait for SIGSTOP before being able to make the next
1058 ptrace call on this LWP. */
1059 new_lwp
->must_set_ptrace_flags
= 1;
1061 if (linux_proc_pid_is_stopped (lwpid
))
1064 debug_printf ("Attached to a stopped process\n");
1066 /* The process is definitely stopped. It is in a job control
1067 stop, unless the kernel predates the TASK_STOPPED /
1068 TASK_TRACED distinction, in which case it might be in a
1069 ptrace stop. Make sure it is in a ptrace stop; from there we
1070 can kill it, signal it, et cetera.
1072 First make sure there is a pending SIGSTOP. Since we are
1073 already attached, the process can not transition from stopped
1074 to running without a PTRACE_CONT; so we know this signal will
1075 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1076 probably already in the queue (unless this kernel is old
1077 enough to use TASK_STOPPED for ptrace stops); but since
1078 SIGSTOP is not an RT signal, it can only be queued once. */
1079 kill_lwp (lwpid
, SIGSTOP
);
1081 /* Finally, resume the stopped process. This will deliver the
1082 SIGSTOP (or a higher priority signal, just like normal
1083 PTRACE_ATTACH), which we'll catch later on. */
1084 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1087 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
1088 brings it to a halt.
1090 There are several cases to consider here:
1092 1) gdbserver has already attached to the process and is being notified
1093 of a new thread that is being created.
1094 In this case we should ignore that SIGSTOP and resume the
1095 process. This is handled below by setting stop_expected = 1,
1096 and the fact that add_thread sets last_resume_kind ==
1099 2) This is the first thread (the process thread), and we're attaching
1100 to it via attach_inferior.
1101 In this case we want the process thread to stop.
1102 This is handled by having linux_attach set last_resume_kind ==
1103 resume_stop after we return.
1105 If the pid we are attaching to is also the tgid, we attach to and
1106 stop all the existing threads. Otherwise, we attach to pid and
1107 ignore any other threads in the same group as this pid.
1109 3) GDB is connecting to gdbserver and is requesting an enumeration of all
1111 In this case we want the thread to stop.
1112 FIXME: This case is currently not properly handled.
1113 We should wait for the SIGSTOP but don't. Things work apparently
1114 because enough time passes between when we ptrace (ATTACH) and when
1115 gdb makes the next ptrace call on the thread.
1117 On the other hand, if we are currently trying to stop all threads, we
1118 should treat the new thread as if we had sent it a SIGSTOP. This works
1119 because we are guaranteed that the add_lwp call above added us to the
1120 end of the list, and so the new thread has not yet reached
1121 wait_for_sigstop (but will). */
1122 new_lwp
->stop_expected
= 1;
1127 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
1128 already attached. Returns true if a new LWP is found, false
1132 attach_proc_task_lwp_callback (ptid_t ptid
)
1134 /* Is this a new thread? */
1135 if (find_thread_ptid (ptid
) == NULL
)
1137 int lwpid
= ptid_get_lwp (ptid
);
1141 debug_printf ("Found new lwp %d\n", lwpid
);
1143 err
= linux_attach_lwp (ptid
);
1145 /* Be quiet if we simply raced with the thread exiting. EPERM
1146 is returned if the thread's task still exists, and is marked
1147 as exited or zombie, as well as other conditions, so in that
1148 case, confirm the status in /proc/PID/status. */
1150 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1154 debug_printf ("Cannot attach to lwp %d: "
1155 "thread is gone (%d: %s)\n",
1156 lwpid
, err
, strerror (err
));
1161 warning (_("Cannot attach to lwp %d: %s"),
1163 linux_ptrace_attach_fail_reason_string (ptid
, err
));
1171 static void async_file_mark (void);
1173 /* Attach to PID. If PID is the tgid, attach to it and all
1177 linux_attach (unsigned long pid
)
1179 struct process_info
*proc
;
1180 struct thread_info
*initial_thread
;
1181 ptid_t ptid
= ptid_build (pid
, pid
, 0);
1184 /* Attach to PID. We will check for other threads
1186 err
= linux_attach_lwp (ptid
);
1188 error ("Cannot attach to process %ld: %s",
1189 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
1191 proc
= linux_add_process (pid
, 1);
1193 /* Don't ignore the initial SIGSTOP if we just attached to this
1194 process. It will be collected by wait shortly. */
1195 initial_thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
1196 initial_thread
->last_resume_kind
= resume_stop
;
1198 /* We must attach to every LWP. If /proc is mounted, use that to
1199 find them now. On the one hand, the inferior may be using raw
1200 clone instead of using pthreads. On the other hand, even if it
1201 is using pthreads, GDB may not be connected yet (thread_db needs
1202 to do symbol lookups, through qSymbol). Also, thread_db walks
1203 structures in the inferior's address space to find the list of
1204 threads/LWPs, and those structures may well be corrupted. Note
1205 that once thread_db is loaded, we'll still use it to list threads
1206 and associate pthread info with each LWP. */
1207 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1209 /* GDB will shortly read the xml target description for this
1210 process, to figure out the process' architecture. But the target
1211 description is only filled in when the first process/thread in
1212 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1213 that now, otherwise, if GDB is fast enough, it could read the
1214 target description _before_ that initial stop. */
1217 struct lwp_info
*lwp
;
1219 ptid_t pid_ptid
= pid_to_ptid (pid
);
1221 lwpid
= linux_wait_for_event_filtered (pid_ptid
, pid_ptid
,
1223 gdb_assert (lwpid
> 0);
1225 lwp
= find_lwp_pid (pid_to_ptid (lwpid
));
1227 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGSTOP
)
1229 lwp
->status_pending_p
= 1;
1230 lwp
->status_pending
= wstat
;
1233 initial_thread
->last_resume_kind
= resume_continue
;
1237 gdb_assert (proc
->tdesc
!= NULL
);
1250 second_thread_of_pid_p (thread_info
*thread
, void *args
)
1252 struct counter
*counter
= (struct counter
*) args
;
1254 if (thread
->id
.pid () == counter
->pid
)
1256 if (++counter
->count
> 1)
1264 last_thread_of_process_p (int pid
)
1266 struct counter counter
= { pid
, 0 };
1268 return (find_inferior (&all_threads
,
1269 second_thread_of_pid_p
, &counter
) == NULL
);
1275 linux_kill_one_lwp (struct lwp_info
*lwp
)
1277 struct thread_info
*thr
= get_lwp_thread (lwp
);
1278 int pid
= lwpid_of (thr
);
1280 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1281 there is no signal context, and ptrace(PTRACE_KILL) (or
1282 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1283 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1284 alternative is to kill with SIGKILL. We only need one SIGKILL
1285 per process, not one for each thread. But since we still support
1286 support debugging programs using raw clone without CLONE_THREAD,
1287 we send one for each thread. For years, we used PTRACE_KILL
1288 only, so we're being a bit paranoid about some old kernels where
1289 PTRACE_KILL might work better (dubious if there are any such, but
1290 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1291 second, and so we're fine everywhere. */
1294 kill_lwp (pid
, SIGKILL
);
1297 int save_errno
= errno
;
1299 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1300 target_pid_to_str (ptid_of (thr
)),
1301 save_errno
? strerror (save_errno
) : "OK");
1305 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1308 int save_errno
= errno
;
1310 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1311 target_pid_to_str (ptid_of (thr
)),
1312 save_errno
? strerror (save_errno
) : "OK");
1316 /* Kill LWP and wait for it to die. */
1319 kill_wait_lwp (struct lwp_info
*lwp
)
1321 struct thread_info
*thr
= get_lwp_thread (lwp
);
1322 int pid
= ptid_get_pid (ptid_of (thr
));
1323 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1328 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1332 linux_kill_one_lwp (lwp
);
1334 /* Make sure it died. Notes:
1336 - The loop is most likely unnecessary.
1338 - We don't use linux_wait_for_event as that could delete lwps
1339 while we're iterating over them. We're not interested in
1340 any pending status at this point, only in making sure all
1341 wait status on the kernel side are collected until the
1344 - We don't use __WALL here as the __WALL emulation relies on
1345 SIGCHLD, and killing a stopped process doesn't generate
1346 one, nor an exit status.
1348 res
= my_waitpid (lwpid
, &wstat
, 0);
1349 if (res
== -1 && errno
== ECHILD
)
1350 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1351 } while (res
> 0 && WIFSTOPPED (wstat
));
1353 /* Even if it was stopped, the child may have already disappeared.
1354 E.g., if it was killed by SIGKILL. */
1355 if (res
< 0 && errno
!= ECHILD
)
1356 perror_with_name ("kill_wait_lwp");
1359 /* Callback for `for_each_thread'. Kills an lwp of a given process,
1360 except the leader. */
1363 kill_one_lwp_callback (thread_info
*thread
, int pid
)
1365 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1367 /* We avoid killing the first thread here, because of a Linux kernel (at
1368 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1369 the children get a chance to be reaped, it will remain a zombie
1372 if (lwpid_of (thread
) == pid
)
1375 debug_printf ("lkop: is last of process %s\n",
1376 target_pid_to_str (thread
->id
));
1380 kill_wait_lwp (lwp
);
1384 linux_kill (int pid
)
1386 struct process_info
*process
;
1387 struct lwp_info
*lwp
;
1389 process
= find_process_pid (pid
);
1390 if (process
== NULL
)
1393 /* If we're killing a running inferior, make sure it is stopped
1394 first, as PTRACE_KILL will not work otherwise. */
1395 stop_all_lwps (0, NULL
);
1397 for_each_thread (pid
, [&] (thread_info
*thread
)
1399 kill_one_lwp_callback (thread
, pid
);
1402 /* See the comment in linux_kill_one_lwp. We did not kill the first
1403 thread in the list, so do so now. */
1404 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1409 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1413 kill_wait_lwp (lwp
);
1415 the_target
->mourn (process
);
1417 /* Since we presently can only stop all lwps of all processes, we
1418 need to unstop lwps of other processes. */
1419 unstop_all_lwps (0, NULL
);
1423 /* Get pending signal of THREAD, for detaching purposes. This is the
1424 signal the thread last stopped for, which we need to deliver to the
1425 thread when detaching, otherwise, it'd be suppressed/lost. */
1428 get_detach_signal (struct thread_info
*thread
)
1430 enum gdb_signal signo
= GDB_SIGNAL_0
;
1432 struct lwp_info
*lp
= get_thread_lwp (thread
);
1434 if (lp
->status_pending_p
)
1435 status
= lp
->status_pending
;
1438 /* If the thread had been suspended by gdbserver, and it stopped
1439 cleanly, then it'll have stopped with SIGSTOP. But we don't
1440 want to deliver that SIGSTOP. */
1441 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1442 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1445 /* Otherwise, we may need to deliver the signal we
1447 status
= lp
->last_status
;
1450 if (!WIFSTOPPED (status
))
1453 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1454 target_pid_to_str (ptid_of (thread
)));
1458 /* Extended wait statuses aren't real SIGTRAPs. */
1459 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1462 debug_printf ("GPS: lwp %s had stopped with extended "
1463 "status: no pending signal\n",
1464 target_pid_to_str (ptid_of (thread
)));
1468 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1470 if (program_signals_p
&& !program_signals
[signo
])
1473 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1474 target_pid_to_str (ptid_of (thread
)),
1475 gdb_signal_to_string (signo
));
1478 else if (!program_signals_p
1479 /* If we have no way to know which signals GDB does not
1480 want to have passed to the program, assume
1481 SIGTRAP/SIGINT, which is GDB's default. */
1482 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1485 debug_printf ("GPS: lwp %s had signal %s, "
1486 "but we don't know if we should pass it. "
1487 "Default to not.\n",
1488 target_pid_to_str (ptid_of (thread
)),
1489 gdb_signal_to_string (signo
));
1495 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1496 target_pid_to_str (ptid_of (thread
)),
1497 gdb_signal_to_string (signo
));
1499 return WSTOPSIG (status
);
1503 /* Detach from LWP. */
1506 linux_detach_one_lwp (struct lwp_info
*lwp
)
1508 struct thread_info
*thread
= get_lwp_thread (lwp
);
1512 /* If there is a pending SIGSTOP, get rid of it. */
1513 if (lwp
->stop_expected
)
1516 debug_printf ("Sending SIGCONT to %s\n",
1517 target_pid_to_str (ptid_of (thread
)));
1519 kill_lwp (lwpid_of (thread
), SIGCONT
);
1520 lwp
->stop_expected
= 0;
1523 /* Pass on any pending signal for this thread. */
1524 sig
= get_detach_signal (thread
);
1526 /* Preparing to resume may try to write registers, and fail if the
1527 lwp is zombie. If that happens, ignore the error. We'll handle
1528 it below, when detach fails with ESRCH. */
1531 /* Flush any pending changes to the process's registers. */
1532 regcache_invalidate_thread (thread
);
1534 /* Finally, let it resume. */
1535 if (the_low_target
.prepare_to_resume
!= NULL
)
1536 the_low_target
.prepare_to_resume (lwp
);
1538 CATCH (ex
, RETURN_MASK_ERROR
)
1540 if (!check_ptrace_stopped_lwp_gone (lwp
))
1541 throw_exception (ex
);
1545 lwpid
= lwpid_of (thread
);
1546 if (ptrace (PTRACE_DETACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0,
1547 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1549 int save_errno
= errno
;
1551 /* We know the thread exists, so ESRCH must mean the lwp is
1552 zombie. This can happen if one of the already-detached
1553 threads exits the whole thread group. In that case we're
1554 still attached, and must reap the lwp. */
1555 if (save_errno
== ESRCH
)
1559 ret
= my_waitpid (lwpid
, &status
, __WALL
);
1562 warning (_("Couldn't reap LWP %d while detaching: %s"),
1563 lwpid
, strerror (errno
));
1565 else if (!WIFEXITED (status
) && !WIFSIGNALED (status
))
1567 warning (_("Reaping LWP %d while detaching "
1568 "returned unexpected status 0x%x"),
1574 error (_("Can't detach %s: %s"),
1575 target_pid_to_str (ptid_of (thread
)),
1576 strerror (save_errno
));
1579 else if (debug_threads
)
1581 debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n",
1582 target_pid_to_str (ptid_of (thread
)),
1589 /* Callback for find_inferior. Detaches from non-leader threads of a
1593 linux_detach_lwp_callback (thread_info
*thread
, void *args
)
1595 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1596 int pid
= *(int *) args
;
1597 int lwpid
= lwpid_of (thread
);
1599 /* Skip other processes. */
1600 if (thread
->id
.pid () != pid
)
1603 /* We don't actually detach from the thread group leader just yet.
1604 If the thread group exits, we must reap the zombie clone lwps
1605 before we're able to reap the leader. */
1606 if (thread
->id
.pid () == lwpid
)
1609 linux_detach_one_lwp (lwp
);
1614 linux_detach (int pid
)
1616 struct process_info
*process
;
1617 struct lwp_info
*main_lwp
;
1619 process
= find_process_pid (pid
);
1620 if (process
== NULL
)
1623 /* As there's a step over already in progress, let it finish first,
1624 otherwise nesting a stabilize_threads operation on top gets real
1626 complete_ongoing_step_over ();
1628 /* Stop all threads before detaching. First, ptrace requires that
1629 the thread is stopped to sucessfully detach. Second, thread_db
1630 may need to uninstall thread event breakpoints from memory, which
1631 only works with a stopped process anyway. */
1632 stop_all_lwps (0, NULL
);
1634 #ifdef USE_THREAD_DB
1635 thread_db_detach (process
);
1638 /* Stabilize threads (move out of jump pads). */
1639 stabilize_threads ();
1641 /* Detach from the clone lwps first. If the thread group exits just
1642 while we're detaching, we must reap the clone lwps before we're
1643 able to reap the leader. */
1644 find_inferior (&all_threads
, linux_detach_lwp_callback
, &pid
);
1646 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1647 linux_detach_one_lwp (main_lwp
);
1649 the_target
->mourn (process
);
1651 /* Since we presently can only stop all lwps of all processes, we
1652 need to unstop lwps of other processes. */
1653 unstop_all_lwps (0, NULL
);
1657 /* Remove all LWPs that belong to process PROC from the lwp list. */
1660 delete_lwp_callback (thread_info
*thread
, void *proc
)
1662 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1663 struct process_info
*process
= (struct process_info
*) proc
;
1665 if (pid_of (thread
) == pid_of (process
))
1672 linux_mourn (struct process_info
*process
)
1674 struct process_info_private
*priv
;
1676 #ifdef USE_THREAD_DB
1677 thread_db_mourn (process
);
1680 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1682 /* Freeing all private data. */
1683 priv
= process
->priv
;
1684 if (the_low_target
.delete_process
!= NULL
)
1685 the_low_target
.delete_process (priv
->arch_private
);
1687 gdb_assert (priv
->arch_private
== NULL
);
1689 process
->priv
= NULL
;
1691 remove_process (process
);
1695 linux_join (int pid
)
1700 ret
= my_waitpid (pid
, &status
, 0);
1701 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1703 } while (ret
!= -1 || errno
!= ECHILD
);
1706 /* Return nonzero if the given thread is still alive. */
1708 linux_thread_alive (ptid_t ptid
)
1710 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1712 /* We assume we always know if a thread exits. If a whole process
1713 exited but we still haven't been able to report it to GDB, we'll
1714 hold on to the last lwp of the dead process. */
1716 return !lwp_is_marked_dead (lwp
);
1721 /* Return 1 if this lwp still has an interesting status pending. If
1722 not (e.g., it had stopped for a breakpoint that is gone), return
1726 thread_still_has_status_pending_p (struct thread_info
*thread
)
1728 struct lwp_info
*lp
= get_thread_lwp (thread
);
1730 if (!lp
->status_pending_p
)
1733 if (thread
->last_resume_kind
!= resume_stop
1734 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1735 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1737 struct thread_info
*saved_thread
;
1741 gdb_assert (lp
->last_status
!= 0);
1745 saved_thread
= current_thread
;
1746 current_thread
= thread
;
1748 if (pc
!= lp
->stop_pc
)
1751 debug_printf ("PC of %ld changed\n",
1756 #if !USE_SIGTRAP_SIGINFO
1757 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1758 && !(*the_low_target
.breakpoint_at
) (pc
))
1761 debug_printf ("previous SW breakpoint of %ld gone\n",
1765 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1766 && !hardware_breakpoint_inserted_here (pc
))
1769 debug_printf ("previous HW breakpoint of %ld gone\n",
1775 current_thread
= saved_thread
;
1780 debug_printf ("discarding pending breakpoint status\n");
1781 lp
->status_pending_p
= 0;
1789 /* Returns true if LWP is resumed from the client's perspective. */
1792 lwp_resumed (struct lwp_info
*lwp
)
1794 struct thread_info
*thread
= get_lwp_thread (lwp
);
1796 if (thread
->last_resume_kind
!= resume_stop
)
1799 /* Did gdb send us a `vCont;t', but we haven't reported the
1800 corresponding stop to gdb yet? If so, the thread is still
1801 resumed/running from gdb's perspective. */
1802 if (thread
->last_resume_kind
== resume_stop
1803 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1809 /* Return 1 if this lwp has an interesting status pending. */
1811 status_pending_p_callback (thread_info
*thread
, void *arg
)
1813 struct lwp_info
*lp
= get_thread_lwp (thread
);
1814 ptid_t ptid
= * (ptid_t
*) arg
;
1816 /* Check if we're only interested in events from a specific process
1817 or a specific LWP. */
1818 if (!ptid_match (ptid_of (thread
), 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
= (struct thread_info
*)
2670 find_inferior_in_random (&all_threads
, status_pending_p_callback
,
2672 if (event_thread
!= NULL
)
2673 event_child
= get_thread_lwp (event_thread
);
2674 if (debug_threads
&& event_thread
)
2675 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2677 else if (!ptid_equal (filter_ptid
, null_ptid
))
2679 requested_child
= find_lwp_pid (filter_ptid
);
2681 if (stopping_threads
== NOT_STOPPING_THREADS
2682 && requested_child
->status_pending_p
2683 && (requested_child
->collecting_fast_tracepoint
2684 != fast_tpoint_collect_result::not_collecting
))
2686 enqueue_one_deferred_signal (requested_child
,
2687 &requested_child
->status_pending
);
2688 requested_child
->status_pending_p
= 0;
2689 requested_child
->status_pending
= 0;
2690 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2693 if (requested_child
->suspended
2694 && requested_child
->status_pending_p
)
2696 internal_error (__FILE__
, __LINE__
,
2697 "requesting an event out of a"
2698 " suspended child?");
2701 if (requested_child
->status_pending_p
)
2703 event_child
= requested_child
;
2704 event_thread
= get_lwp_thread (event_child
);
2708 if (event_child
!= NULL
)
2711 debug_printf ("Got an event from pending child %ld (%04x)\n",
2712 lwpid_of (event_thread
), event_child
->status_pending
);
2713 *wstatp
= event_child
->status_pending
;
2714 event_child
->status_pending_p
= 0;
2715 event_child
->status_pending
= 0;
2716 current_thread
= event_thread
;
2717 return lwpid_of (event_thread
);
2720 /* But if we don't find a pending event, we'll have to wait.
2722 We only enter this loop if no process has a pending wait status.
2723 Thus any action taken in response to a wait status inside this
2724 loop is responding as soon as we detect the status, not after any
2727 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2728 all signals while here. */
2729 sigfillset (&block_mask
);
2730 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2732 /* Always pull all events out of the kernel. We'll randomly select
2733 an event LWP out of all that have events, to prevent
2735 while (event_child
== NULL
)
2739 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2742 - If the thread group leader exits while other threads in the
2743 thread group still exist, waitpid(TGID, ...) hangs. That
2744 waitpid won't return an exit status until the other threads
2745 in the group are reaped.
2747 - When a non-leader thread execs, that thread just vanishes
2748 without reporting an exit (so we'd hang if we waited for it
2749 explicitly in that case). The exec event is reported to
2752 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2755 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2756 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2762 debug_printf ("LLW: waitpid %ld received %s\n",
2763 (long) ret
, status_to_str (*wstatp
));
2766 /* Filter all events. IOW, leave all events pending. We'll
2767 randomly select an event LWP out of all that have events
2769 linux_low_filter_event (ret
, *wstatp
);
2770 /* Retry until nothing comes out of waitpid. A single
2771 SIGCHLD can indicate more than one child stopped. */
2775 /* Now that we've pulled all events out of the kernel, resume
2776 LWPs that don't have an interesting event to report. */
2777 if (stopping_threads
== NOT_STOPPING_THREADS
)
2778 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2780 /* ... and find an LWP with a status to report to the core, if
2782 event_thread
= (struct thread_info
*)
2783 find_inferior_in_random (&all_threads
, status_pending_p_callback
,
2785 if (event_thread
!= NULL
)
2787 event_child
= get_thread_lwp (event_thread
);
2788 *wstatp
= event_child
->status_pending
;
2789 event_child
->status_pending_p
= 0;
2790 event_child
->status_pending
= 0;
2794 /* Check for zombie thread group leaders. Those can't be reaped
2795 until all other threads in the thread group are. */
2796 check_zombie_leaders ();
2798 /* If there are no resumed children left in the set of LWPs we
2799 want to wait for, bail. We can't just block in
2800 waitpid/sigsuspend, because lwps might have been left stopped
2801 in trace-stop state, and we'd be stuck forever waiting for
2802 their status to change (which would only happen if we resumed
2803 them). Even if WNOHANG is set, this return code is preferred
2804 over 0 (below), as it is more detailed. */
2805 if ((find_inferior (&all_threads
,
2806 not_stopped_callback
,
2807 &wait_ptid
) == NULL
))
2810 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2811 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2815 /* No interesting event to report to the caller. */
2816 if ((options
& WNOHANG
))
2819 debug_printf ("WNOHANG set, no event found\n");
2821 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2825 /* Block until we get an event reported with SIGCHLD. */
2827 debug_printf ("sigsuspend'ing\n");
2829 sigsuspend (&prev_mask
);
2830 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2834 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2836 current_thread
= event_thread
;
2838 return lwpid_of (event_thread
);
2841 /* Wait for an event from child(ren) PTID. PTIDs can be:
2842 minus_one_ptid, to specify any child; a pid PTID, specifying all
2843 lwps of a thread group; or a PTID representing a single lwp. Store
2844 the stop status through the status pointer WSTAT. OPTIONS is
2845 passed to the waitpid call. Return 0 if no event was found and
2846 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2847 was found. Return the PID of the stopped child otherwise. */
2850 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2852 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2855 /* Count the LWP's that have had events. */
2858 count_events_callback (thread_info
*thread
, void *data
)
2860 struct lwp_info
*lp
= get_thread_lwp (thread
);
2861 int *count
= (int *) data
;
2863 gdb_assert (count
!= NULL
);
2865 /* Count only resumed LWPs that have an event pending. */
2866 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2867 && lp
->status_pending_p
)
2873 /* Select the LWP (if any) that is currently being single-stepped. */
2876 select_singlestep_lwp_callback (thread_info
*thread
, void *data
)
2878 struct lwp_info
*lp
= get_thread_lwp (thread
);
2880 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2881 && thread
->last_resume_kind
== resume_step
2882 && lp
->status_pending_p
)
2888 /* Select the Nth LWP that has had an event. */
2891 select_event_lwp_callback (thread_info
*thread
, void *data
)
2893 struct lwp_info
*lp
= get_thread_lwp (thread
);
2894 int *selector
= (int *) data
;
2896 gdb_assert (selector
!= NULL
);
2898 /* Select only resumed LWPs that have an event pending. */
2899 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2900 && lp
->status_pending_p
)
2901 if ((*selector
)-- == 0)
2907 /* Select one LWP out of those that have events pending. */
2910 select_event_lwp (struct lwp_info
**orig_lp
)
2913 int random_selector
;
2914 struct thread_info
*event_thread
= NULL
;
2916 /* In all-stop, give preference to the LWP that is being
2917 single-stepped. There will be at most one, and it's the LWP that
2918 the core is most interested in. If we didn't do this, then we'd
2919 have to handle pending step SIGTRAPs somehow in case the core
2920 later continues the previously-stepped thread, otherwise we'd
2921 report the pending SIGTRAP, and the core, not having stepped the
2922 thread, wouldn't understand what the trap was for, and therefore
2923 would report it to the user as a random signal. */
2927 = (struct thread_info
*) find_inferior (&all_threads
,
2928 select_singlestep_lwp_callback
,
2930 if (event_thread
!= NULL
)
2933 debug_printf ("SEL: Select single-step %s\n",
2934 target_pid_to_str (ptid_of (event_thread
)));
2937 if (event_thread
== NULL
)
2939 /* No single-stepping LWP. Select one at random, out of those
2940 which have had events. */
2942 /* First see how many events we have. */
2943 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2944 gdb_assert (num_events
> 0);
2946 /* Now randomly pick a LWP out of those that have had
2948 random_selector
= (int)
2949 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2951 if (debug_threads
&& num_events
> 1)
2952 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2953 num_events
, random_selector
);
2956 = (struct thread_info
*) find_inferior (&all_threads
,
2957 select_event_lwp_callback
,
2961 if (event_thread
!= NULL
)
2963 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2965 /* Switch the event LWP. */
2966 *orig_lp
= event_lp
;
2970 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2974 unsuspend_all_lwps (struct lwp_info
*except
)
2976 for_each_thread ([&] (thread_info
*thread
)
2978 lwp_info
*lwp
= get_thread_lwp (thread
);
2981 lwp_suspended_decr (lwp
);
2985 static void move_out_of_jump_pad_callback (thread_info
*thread
);
2986 static bool stuck_in_jump_pad_callback (thread_info
*thread
);
2987 static int lwp_running (thread_info
*thread
, void *data
);
2988 static ptid_t
linux_wait_1 (ptid_t ptid
,
2989 struct target_waitstatus
*ourstatus
,
2990 int target_options
);
2992 /* Stabilize threads (move out of jump pads).
2994 If a thread is midway collecting a fast tracepoint, we need to
2995 finish the collection and move it out of the jump pad before
2996 reporting the signal.
2998 This avoids recursion while collecting (when a signal arrives
2999 midway, and the signal handler itself collects), which would trash
3000 the trace buffer. In case the user set a breakpoint in a signal
3001 handler, this avoids the backtrace showing the jump pad, etc..
3002 Most importantly, there are certain things we can't do safely if
3003 threads are stopped in a jump pad (or in its callee's). For
3006 - starting a new trace run. A thread still collecting the
3007 previous run, could trash the trace buffer when resumed. The trace
3008 buffer control structures would have been reset but the thread had
3009 no way to tell. The thread could even midway memcpy'ing to the
3010 buffer, which would mean that when resumed, it would clobber the
3011 trace buffer that had been set for a new run.
3013 - we can't rewrite/reuse the jump pads for new tracepoints
3014 safely. Say you do tstart while a thread is stopped midway while
3015 collecting. When the thread is later resumed, it finishes the
3016 collection, and returns to the jump pad, to execute the original
3017 instruction that was under the tracepoint jump at the time the
3018 older run had been started. If the jump pad had been rewritten
3019 since for something else in the new run, the thread would now
3020 execute the wrong / random instructions. */
3023 linux_stabilize_threads (void)
3025 thread_info
*thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
3027 if (thread_stuck
!= NULL
)
3030 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
3031 lwpid_of (thread_stuck
));
3035 thread_info
*saved_thread
= current_thread
;
3037 stabilizing_threads
= 1;
3040 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
3042 /* Loop until all are stopped out of the jump pads. */
3043 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
3045 struct target_waitstatus ourstatus
;
3046 struct lwp_info
*lwp
;
3049 /* Note that we go through the full wait even loop. While
3050 moving threads out of jump pad, we need to be able to step
3051 over internal breakpoints and such. */
3052 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
3054 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
3056 lwp
= get_thread_lwp (current_thread
);
3059 lwp_suspended_inc (lwp
);
3061 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3062 || current_thread
->last_resume_kind
== resume_stop
)
3064 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3065 enqueue_one_deferred_signal (lwp
, &wstat
);
3070 unsuspend_all_lwps (NULL
);
3072 stabilizing_threads
= 0;
3074 current_thread
= saved_thread
;
3078 thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
3080 if (thread_stuck
!= NULL
)
3081 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3082 lwpid_of (thread_stuck
));
3086 /* Convenience function that is called when the kernel reports an
3087 event that is not passed out to GDB. */
3090 ignore_event (struct target_waitstatus
*ourstatus
)
3092 /* If we got an event, there may still be others, as a single
3093 SIGCHLD can indicate more than one child stopped. This forces
3094 another target_wait call. */
3097 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3101 /* Convenience function that is called when the kernel reports an exit
3102 event. This decides whether to report the event to GDB as a
3103 process exit event, a thread exit event, or to suppress the
3107 filter_exit_event (struct lwp_info
*event_child
,
3108 struct target_waitstatus
*ourstatus
)
3110 struct thread_info
*thread
= get_lwp_thread (event_child
);
3111 ptid_t ptid
= ptid_of (thread
);
3113 if (!last_thread_of_process_p (pid_of (thread
)))
3115 if (report_thread_events
)
3116 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3118 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3120 delete_lwp (event_child
);
3125 /* Returns 1 if GDB is interested in any event_child syscalls. */
3128 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3130 struct thread_info
*thread
= get_lwp_thread (event_child
);
3131 struct process_info
*proc
= get_thread_process (thread
);
3133 return !proc
->syscalls_to_catch
.empty ();
3136 /* Returns 1 if GDB is interested in the event_child syscall.
3137 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3140 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3143 struct thread_info
*thread
= get_lwp_thread (event_child
);
3144 struct process_info
*proc
= get_thread_process (thread
);
3146 if (proc
->syscalls_to_catch
.empty ())
3149 if (proc
->syscalls_to_catch
[0] == ANY_SYSCALL
)
3152 get_syscall_trapinfo (event_child
, &sysno
);
3154 for (int iter
: proc
->syscalls_to_catch
)
3161 /* Wait for process, returns status. */
3164 linux_wait_1 (ptid_t ptid
,
3165 struct target_waitstatus
*ourstatus
, int target_options
)
3168 struct lwp_info
*event_child
;
3171 int step_over_finished
;
3172 int bp_explains_trap
;
3173 int maybe_internal_trap
;
3182 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3185 /* Translate generic target options into linux options. */
3187 if (target_options
& TARGET_WNOHANG
)
3190 bp_explains_trap
= 0;
3193 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3195 /* Find a resumed LWP, if any. */
3196 if (find_inferior (&all_threads
,
3197 status_pending_p_callback
,
3198 &minus_one_ptid
) != NULL
)
3200 else if ((find_inferior (&all_threads
,
3201 not_stopped_callback
,
3202 &minus_one_ptid
) != NULL
))
3207 if (ptid_equal (step_over_bkpt
, null_ptid
))
3208 pid
= linux_wait_for_event (ptid
, &w
, options
);
3212 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3213 target_pid_to_str (step_over_bkpt
));
3214 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3217 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3219 gdb_assert (target_options
& TARGET_WNOHANG
);
3223 debug_printf ("linux_wait_1 ret = null_ptid, "
3224 "TARGET_WAITKIND_IGNORE\n");
3228 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3235 debug_printf ("linux_wait_1 ret = null_ptid, "
3236 "TARGET_WAITKIND_NO_RESUMED\n");
3240 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3244 event_child
= get_thread_lwp (current_thread
);
3246 /* linux_wait_for_event only returns an exit status for the last
3247 child of a process. Report it. */
3248 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3252 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3253 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3257 debug_printf ("linux_wait_1 ret = %s, exited with "
3259 target_pid_to_str (ptid_of (current_thread
)),
3266 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3267 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3271 debug_printf ("linux_wait_1 ret = %s, terminated with "
3273 target_pid_to_str (ptid_of (current_thread
)),
3279 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3280 return filter_exit_event (event_child
, ourstatus
);
3282 return ptid_of (current_thread
);
3285 /* If step-over executes a breakpoint instruction, in the case of a
3286 hardware single step it means a gdb/gdbserver breakpoint had been
3287 planted on top of a permanent breakpoint, in the case of a software
3288 single step it may just mean that gdbserver hit the reinsert breakpoint.
3289 The PC has been adjusted by save_stop_reason to point at
3290 the breakpoint address.
3291 So in the case of the hardware single step advance the PC manually
3292 past the breakpoint and in the case of software single step advance only
3293 if it's not the single_step_breakpoint we are hitting.
3294 This avoids that a program would keep trapping a permanent breakpoint
3296 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3297 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3298 && (event_child
->stepping
3299 || !single_step_breakpoint_inserted_here (event_child
->stop_pc
)))
3301 int increment_pc
= 0;
3302 int breakpoint_kind
= 0;
3303 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3306 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3307 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3311 debug_printf ("step-over for %s executed software breakpoint\n",
3312 target_pid_to_str (ptid_of (current_thread
)));
3315 if (increment_pc
!= 0)
3317 struct regcache
*regcache
3318 = get_thread_regcache (current_thread
, 1);
3320 event_child
->stop_pc
+= increment_pc
;
3321 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3323 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3324 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3328 /* If this event was not handled before, and is not a SIGTRAP, we
3329 report it. SIGILL and SIGSEGV are also treated as traps in case
3330 a breakpoint is inserted at the current PC. If this target does
3331 not support internal breakpoints at all, we also report the
3332 SIGTRAP without further processing; it's of no concern to us. */
3334 = (supports_breakpoints ()
3335 && (WSTOPSIG (w
) == SIGTRAP
3336 || ((WSTOPSIG (w
) == SIGILL
3337 || WSTOPSIG (w
) == SIGSEGV
)
3338 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3340 if (maybe_internal_trap
)
3342 /* Handle anything that requires bookkeeping before deciding to
3343 report the event or continue waiting. */
3345 /* First check if we can explain the SIGTRAP with an internal
3346 breakpoint, or if we should possibly report the event to GDB.
3347 Do this before anything that may remove or insert a
3349 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3351 /* We have a SIGTRAP, possibly a step-over dance has just
3352 finished. If so, tweak the state machine accordingly,
3353 reinsert breakpoints and delete any single-step
3355 step_over_finished
= finish_step_over (event_child
);
3357 /* Now invoke the callbacks of any internal breakpoints there. */
3358 check_breakpoints (event_child
->stop_pc
);
3360 /* Handle tracepoint data collecting. This may overflow the
3361 trace buffer, and cause a tracing stop, removing
3363 trace_event
= handle_tracepoints (event_child
);
3365 if (bp_explains_trap
)
3368 debug_printf ("Hit a gdbserver breakpoint.\n");
3373 /* We have some other signal, possibly a step-over dance was in
3374 progress, and it should be cancelled too. */
3375 step_over_finished
= finish_step_over (event_child
);
3378 /* We have all the data we need. Either report the event to GDB, or
3379 resume threads and keep waiting for more. */
3381 /* If we're collecting a fast tracepoint, finish the collection and
3382 move out of the jump pad before delivering a signal. See
3383 linux_stabilize_threads. */
3386 && WSTOPSIG (w
) != SIGTRAP
3387 && supports_fast_tracepoints ()
3388 && agent_loaded_p ())
3391 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3392 "to defer or adjust it.\n",
3393 WSTOPSIG (w
), lwpid_of (current_thread
));
3395 /* Allow debugging the jump pad itself. */
3396 if (current_thread
->last_resume_kind
!= resume_step
3397 && maybe_move_out_of_jump_pad (event_child
, &w
))
3399 enqueue_one_deferred_signal (event_child
, &w
);
3402 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3403 WSTOPSIG (w
), lwpid_of (current_thread
));
3405 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3409 return ignore_event (ourstatus
);
3413 if (event_child
->collecting_fast_tracepoint
3414 != fast_tpoint_collect_result::not_collecting
)
3417 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3418 "Check if we're already there.\n",
3419 lwpid_of (current_thread
),
3420 (int) event_child
->collecting_fast_tracepoint
);
3424 event_child
->collecting_fast_tracepoint
3425 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3427 if (event_child
->collecting_fast_tracepoint
3428 != fast_tpoint_collect_result::before_insn
)
3430 /* No longer need this breakpoint. */
3431 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3434 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3435 "stopping all threads momentarily.\n");
3437 /* Other running threads could hit this breakpoint.
3438 We don't handle moribund locations like GDB does,
3439 instead we always pause all threads when removing
3440 breakpoints, so that any step-over or
3441 decr_pc_after_break adjustment is always taken
3442 care of while the breakpoint is still
3444 stop_all_lwps (1, event_child
);
3446 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3447 event_child
->exit_jump_pad_bkpt
= NULL
;
3449 unstop_all_lwps (1, event_child
);
3451 gdb_assert (event_child
->suspended
>= 0);
3455 if (event_child
->collecting_fast_tracepoint
3456 == fast_tpoint_collect_result::not_collecting
)
3459 debug_printf ("fast tracepoint finished "
3460 "collecting successfully.\n");
3462 /* We may have a deferred signal to report. */
3463 if (dequeue_one_deferred_signal (event_child
, &w
))
3466 debug_printf ("dequeued one signal.\n");
3471 debug_printf ("no deferred signals.\n");
3473 if (stabilizing_threads
)
3475 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3476 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3480 debug_printf ("linux_wait_1 ret = %s, stopped "
3481 "while stabilizing threads\n",
3482 target_pid_to_str (ptid_of (current_thread
)));
3486 return ptid_of (current_thread
);
3492 /* Check whether GDB would be interested in this event. */
3494 /* Check if GDB is interested in this syscall. */
3496 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3497 && !gdb_catch_this_syscall_p (event_child
))
3501 debug_printf ("Ignored syscall for LWP %ld.\n",
3502 lwpid_of (current_thread
));
3505 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3510 return ignore_event (ourstatus
);
3513 /* If GDB is not interested in this signal, don't stop other
3514 threads, and don't report it to GDB. Just resume the inferior
3515 right away. We do this for threading-related signals as well as
3516 any that GDB specifically requested we ignore. But never ignore
3517 SIGSTOP if we sent it ourselves, and do not ignore signals when
3518 stepping - they may require special handling to skip the signal
3519 handler. Also never ignore signals that could be caused by a
3522 && current_thread
->last_resume_kind
!= resume_step
3524 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3525 (current_process ()->priv
->thread_db
!= NULL
3526 && (WSTOPSIG (w
) == __SIGRTMIN
3527 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3530 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3531 && !(WSTOPSIG (w
) == SIGSTOP
3532 && current_thread
->last_resume_kind
== resume_stop
)
3533 && !linux_wstatus_maybe_breakpoint (w
))))
3535 siginfo_t info
, *info_p
;
3538 debug_printf ("Ignored signal %d for LWP %ld.\n",
3539 WSTOPSIG (w
), lwpid_of (current_thread
));
3541 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3542 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3547 if (step_over_finished
)
3549 /* We cancelled this thread's step-over above. We still
3550 need to unsuspend all other LWPs, and set them back
3551 running again while the signal handler runs. */
3552 unsuspend_all_lwps (event_child
);
3554 /* Enqueue the pending signal info so that proceed_all_lwps
3556 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3558 proceed_all_lwps ();
3562 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3563 WSTOPSIG (w
), info_p
);
3569 return ignore_event (ourstatus
);
3572 /* Note that all addresses are always "out of the step range" when
3573 there's no range to begin with. */
3574 in_step_range
= lwp_in_step_range (event_child
);
3576 /* If GDB wanted this thread to single step, and the thread is out
3577 of the step range, we always want to report the SIGTRAP, and let
3578 GDB handle it. Watchpoints should always be reported. So should
3579 signals we can't explain. A SIGTRAP we can't explain could be a
3580 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3581 do, we're be able to handle GDB breakpoints on top of internal
3582 breakpoints, by handling the internal breakpoint and still
3583 reporting the event to GDB. If we don't, we're out of luck, GDB
3584 won't see the breakpoint hit. If we see a single-step event but
3585 the thread should be continuing, don't pass the trap to gdb.
3586 That indicates that we had previously finished a single-step but
3587 left the single-step pending -- see
3588 complete_ongoing_step_over. */
3589 report_to_gdb
= (!maybe_internal_trap
3590 || (current_thread
->last_resume_kind
== resume_step
3592 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3594 && !bp_explains_trap
3596 && !step_over_finished
3597 && !(current_thread
->last_resume_kind
== resume_continue
3598 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3599 || (gdb_breakpoint_here (event_child
->stop_pc
)
3600 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3601 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3602 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3604 run_breakpoint_commands (event_child
->stop_pc
);
3606 /* We found no reason GDB would want us to stop. We either hit one
3607 of our own breakpoints, or finished an internal step GDB
3608 shouldn't know about. */
3613 if (bp_explains_trap
)
3614 debug_printf ("Hit a gdbserver breakpoint.\n");
3615 if (step_over_finished
)
3616 debug_printf ("Step-over finished.\n");
3618 debug_printf ("Tracepoint event.\n");
3619 if (lwp_in_step_range (event_child
))
3620 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3621 paddress (event_child
->stop_pc
),
3622 paddress (event_child
->step_range_start
),
3623 paddress (event_child
->step_range_end
));
3626 /* We're not reporting this breakpoint to GDB, so apply the
3627 decr_pc_after_break adjustment to the inferior's regcache
3630 if (the_low_target
.set_pc
!= NULL
)
3632 struct regcache
*regcache
3633 = get_thread_regcache (current_thread
, 1);
3634 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3637 if (step_over_finished
)
3639 /* If we have finished stepping over a breakpoint, we've
3640 stopped and suspended all LWPs momentarily except the
3641 stepping one. This is where we resume them all again.
3642 We're going to keep waiting, so use proceed, which
3643 handles stepping over the next breakpoint. */
3644 unsuspend_all_lwps (event_child
);
3648 /* Remove the single-step breakpoints if any. Note that
3649 there isn't single-step breakpoint if we finished stepping
3651 if (can_software_single_step ()
3652 && has_single_step_breakpoints (current_thread
))
3654 stop_all_lwps (0, event_child
);
3655 delete_single_step_breakpoints (current_thread
);
3656 unstop_all_lwps (0, event_child
);
3661 debug_printf ("proceeding all threads.\n");
3662 proceed_all_lwps ();
3667 return ignore_event (ourstatus
);
3672 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3675 = target_waitstatus_to_string (&event_child
->waitstatus
);
3677 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3678 lwpid_of (get_lwp_thread (event_child
)), str
.c_str ());
3680 if (current_thread
->last_resume_kind
== resume_step
)
3682 if (event_child
->step_range_start
== event_child
->step_range_end
)
3683 debug_printf ("GDB wanted to single-step, reporting event.\n");
3684 else if (!lwp_in_step_range (event_child
))
3685 debug_printf ("Out of step range, reporting event.\n");
3687 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3688 debug_printf ("Stopped by watchpoint.\n");
3689 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3690 debug_printf ("Stopped by GDB breakpoint.\n");
3692 debug_printf ("Hit a non-gdbserver trap event.\n");
3695 /* Alright, we're going to report a stop. */
3697 /* Remove single-step breakpoints. */
3698 if (can_software_single_step ())
3700 /* Remove single-step breakpoints or not. It it is true, stop all
3701 lwps, so that other threads won't hit the breakpoint in the
3703 int remove_single_step_breakpoints_p
= 0;
3707 remove_single_step_breakpoints_p
3708 = has_single_step_breakpoints (current_thread
);
3712 /* In all-stop, a stop reply cancels all previous resume
3713 requests. Delete all single-step breakpoints. */
3715 find_thread ([&] (thread_info
*thread
) {
3716 if (has_single_step_breakpoints (thread
))
3718 remove_single_step_breakpoints_p
= 1;
3726 if (remove_single_step_breakpoints_p
)
3728 /* If we remove single-step breakpoints from memory, stop all lwps,
3729 so that other threads won't hit the breakpoint in the staled
3731 stop_all_lwps (0, event_child
);
3735 gdb_assert (has_single_step_breakpoints (current_thread
));
3736 delete_single_step_breakpoints (current_thread
);
3740 for_each_thread ([] (thread_info
*thread
){
3741 if (has_single_step_breakpoints (thread
))
3742 delete_single_step_breakpoints (thread
);
3746 unstop_all_lwps (0, event_child
);
3750 if (!stabilizing_threads
)
3752 /* In all-stop, stop all threads. */
3754 stop_all_lwps (0, NULL
);
3756 if (step_over_finished
)
3760 /* If we were doing a step-over, all other threads but
3761 the stepping one had been paused in start_step_over,
3762 with their suspend counts incremented. We don't want
3763 to do a full unstop/unpause, because we're in
3764 all-stop mode (so we want threads stopped), but we
3765 still need to unsuspend the other threads, to
3766 decrement their `suspended' count back. */
3767 unsuspend_all_lwps (event_child
);
3771 /* If we just finished a step-over, then all threads had
3772 been momentarily paused. In all-stop, that's fine,
3773 we want threads stopped by now anyway. In non-stop,
3774 we need to re-resume threads that GDB wanted to be
3776 unstop_all_lwps (1, event_child
);
3780 /* If we're not waiting for a specific LWP, choose an event LWP
3781 from among those that have had events. Giving equal priority
3782 to all LWPs that have had events helps prevent
3784 if (ptid_equal (ptid
, minus_one_ptid
))
3786 event_child
->status_pending_p
= 1;
3787 event_child
->status_pending
= w
;
3789 select_event_lwp (&event_child
);
3791 /* current_thread and event_child must stay in sync. */
3792 current_thread
= get_lwp_thread (event_child
);
3794 event_child
->status_pending_p
= 0;
3795 w
= event_child
->status_pending
;
3799 /* Stabilize threads (move out of jump pads). */
3801 stabilize_threads ();
3805 /* If we just finished a step-over, then all threads had been
3806 momentarily paused. In all-stop, that's fine, we want
3807 threads stopped by now anyway. In non-stop, we need to
3808 re-resume threads that GDB wanted to be running. */
3809 if (step_over_finished
)
3810 unstop_all_lwps (1, event_child
);
3813 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3815 /* If the reported event is an exit, fork, vfork or exec, let
3818 /* Break the unreported fork relationship chain. */
3819 if (event_child
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
3820 || event_child
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
)
3822 event_child
->fork_relative
->fork_relative
= NULL
;
3823 event_child
->fork_relative
= NULL
;
3826 *ourstatus
= event_child
->waitstatus
;
3827 /* Clear the event lwp's waitstatus since we handled it already. */
3828 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3831 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3833 /* Now that we've selected our final event LWP, un-adjust its PC if
3834 it was a software breakpoint, and the client doesn't know we can
3835 adjust the breakpoint ourselves. */
3836 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3837 && !swbreak_feature
)
3839 int decr_pc
= the_low_target
.decr_pc_after_break
;
3843 struct regcache
*regcache
3844 = get_thread_regcache (current_thread
, 1);
3845 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3849 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3851 get_syscall_trapinfo (event_child
,
3852 &ourstatus
->value
.syscall_number
);
3853 ourstatus
->kind
= event_child
->syscall_state
;
3855 else if (current_thread
->last_resume_kind
== resume_stop
3856 && WSTOPSIG (w
) == SIGSTOP
)
3858 /* A thread that has been requested to stop by GDB with vCont;t,
3859 and it stopped cleanly, so report as SIG0. The use of
3860 SIGSTOP is an implementation detail. */
3861 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3863 else if (current_thread
->last_resume_kind
== resume_stop
3864 && WSTOPSIG (w
) != SIGSTOP
)
3866 /* A thread that has been requested to stop by GDB with vCont;t,
3867 but, it stopped for other reasons. */
3868 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3870 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3872 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3875 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3879 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3880 target_pid_to_str (ptid_of (current_thread
)),
3881 ourstatus
->kind
, ourstatus
->value
.sig
);
3885 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3886 return filter_exit_event (event_child
, ourstatus
);
3888 return ptid_of (current_thread
);
3891 /* Get rid of any pending event in the pipe. */
3893 async_file_flush (void)
3899 ret
= read (linux_event_pipe
[0], &buf
, 1);
3900 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3903 /* Put something in the pipe, so the event loop wakes up. */
3905 async_file_mark (void)
3909 async_file_flush ();
3912 ret
= write (linux_event_pipe
[1], "+", 1);
3913 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3915 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3916 be awakened anyway. */
3920 linux_wait (ptid_t ptid
,
3921 struct target_waitstatus
*ourstatus
, int target_options
)
3925 /* Flush the async file first. */
3926 if (target_is_async_p ())
3927 async_file_flush ();
3931 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3933 while ((target_options
& TARGET_WNOHANG
) == 0
3934 && ptid_equal (event_ptid
, null_ptid
)
3935 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3937 /* If at least one stop was reported, there may be more. A single
3938 SIGCHLD can signal more than one child stop. */
3939 if (target_is_async_p ()
3940 && (target_options
& TARGET_WNOHANG
) != 0
3941 && !ptid_equal (event_ptid
, null_ptid
))
3947 /* Send a signal to an LWP. */
3950 kill_lwp (unsigned long lwpid
, int signo
)
3955 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3956 if (errno
== ENOSYS
)
3958 /* If tkill fails, then we are not using nptl threads, a
3959 configuration we no longer support. */
3960 perror_with_name (("tkill"));
3966 linux_stop_lwp (struct lwp_info
*lwp
)
3972 send_sigstop (struct lwp_info
*lwp
)
3976 pid
= lwpid_of (get_lwp_thread (lwp
));
3978 /* If we already have a pending stop signal for this process, don't
3980 if (lwp
->stop_expected
)
3983 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3989 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3991 lwp
->stop_expected
= 1;
3992 kill_lwp (pid
, SIGSTOP
);
3996 send_sigstop_callback (thread_info
*thread
, void *except
)
3998 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4000 /* Ignore EXCEPT. */
4011 /* Increment the suspend count of an LWP, and stop it, if not stopped
4014 suspend_and_send_sigstop_callback (thread_info
*thread
, void *except
)
4016 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4018 /* Ignore EXCEPT. */
4022 lwp_suspended_inc (lwp
);
4024 return send_sigstop_callback (thread
, except
);
4028 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
4030 /* Store the exit status for later. */
4031 lwp
->status_pending_p
= 1;
4032 lwp
->status_pending
= wstat
;
4034 /* Store in waitstatus as well, as there's nothing else to process
4036 if (WIFEXITED (wstat
))
4038 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
4039 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
4041 else if (WIFSIGNALED (wstat
))
4043 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
4044 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
4047 /* Prevent trying to stop it. */
4050 /* No further stops are expected from a dead lwp. */
4051 lwp
->stop_expected
= 0;
4054 /* Return true if LWP has exited already, and has a pending exit event
4055 to report to GDB. */
4058 lwp_is_marked_dead (struct lwp_info
*lwp
)
4060 return (lwp
->status_pending_p
4061 && (WIFEXITED (lwp
->status_pending
)
4062 || WIFSIGNALED (lwp
->status_pending
)));
4065 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4068 wait_for_sigstop (void)
4070 struct thread_info
*saved_thread
;
4075 saved_thread
= current_thread
;
4076 if (saved_thread
!= NULL
)
4077 saved_tid
= saved_thread
->id
;
4079 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4082 debug_printf ("wait_for_sigstop: pulling events\n");
4084 /* Passing NULL_PTID as filter indicates we want all events to be
4085 left pending. Eventually this returns when there are no
4086 unwaited-for children left. */
4087 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4089 gdb_assert (ret
== -1);
4091 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4092 current_thread
= saved_thread
;
4096 debug_printf ("Previously current thread died.\n");
4098 /* We can't change the current inferior behind GDB's back,
4099 otherwise, a subsequent command may apply to the wrong
4101 current_thread
= NULL
;
4105 /* Returns true if THREAD is stopped in a jump pad, and we can't
4106 move it out, because we need to report the stop event to GDB. For
4107 example, if the user puts a breakpoint in the jump pad, it's
4108 because she wants to debug it. */
4111 stuck_in_jump_pad_callback (thread_info
*thread
)
4113 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4115 if (lwp
->suspended
!= 0)
4117 internal_error (__FILE__
, __LINE__
,
4118 "LWP %ld is suspended, suspended=%d\n",
4119 lwpid_of (thread
), lwp
->suspended
);
4121 gdb_assert (lwp
->stopped
);
4123 /* Allow debugging the jump pad, gdb_collect, etc.. */
4124 return (supports_fast_tracepoints ()
4125 && agent_loaded_p ()
4126 && (gdb_breakpoint_here (lwp
->stop_pc
)
4127 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4128 || thread
->last_resume_kind
== resume_step
)
4129 && (linux_fast_tracepoint_collecting (lwp
, NULL
)
4130 != fast_tpoint_collect_result::not_collecting
));
4134 move_out_of_jump_pad_callback (thread_info
*thread
)
4136 struct thread_info
*saved_thread
;
4137 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4140 if (lwp
->suspended
!= 0)
4142 internal_error (__FILE__
, __LINE__
,
4143 "LWP %ld is suspended, suspended=%d\n",
4144 lwpid_of (thread
), lwp
->suspended
);
4146 gdb_assert (lwp
->stopped
);
4148 /* For gdb_breakpoint_here. */
4149 saved_thread
= current_thread
;
4150 current_thread
= thread
;
4152 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4154 /* Allow debugging the jump pad, gdb_collect, etc. */
4155 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4156 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4157 && thread
->last_resume_kind
!= resume_step
4158 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4161 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4166 lwp
->status_pending_p
= 0;
4167 enqueue_one_deferred_signal (lwp
, wstat
);
4170 debug_printf ("Signal %d for LWP %ld deferred "
4172 WSTOPSIG (*wstat
), lwpid_of (thread
));
4175 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4178 lwp_suspended_inc (lwp
);
4180 current_thread
= saved_thread
;
4184 lwp_running (thread_info
*thread
, void *data
)
4186 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4188 if (lwp_is_marked_dead (lwp
))
4195 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4196 If SUSPEND, then also increase the suspend count of every LWP,
4200 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4202 /* Should not be called recursively. */
4203 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4208 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4209 suspend
? "stop-and-suspend" : "stop",
4211 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4215 stopping_threads
= (suspend
4216 ? STOPPING_AND_SUSPENDING_THREADS
4217 : STOPPING_THREADS
);
4220 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
4222 find_inferior (&all_threads
, send_sigstop_callback
, except
);
4223 wait_for_sigstop ();
4224 stopping_threads
= NOT_STOPPING_THREADS
;
4228 debug_printf ("stop_all_lwps done, setting stopping_threads "
4229 "back to !stopping\n");
4234 /* Enqueue one signal in the chain of signals which need to be
4235 delivered to this process on next resume. */
4238 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4240 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4242 p_sig
->prev
= lwp
->pending_signals
;
4243 p_sig
->signal
= signal
;
4245 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4247 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4248 lwp
->pending_signals
= p_sig
;
4251 /* Install breakpoints for software single stepping. */
4254 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4256 struct thread_info
*thread
= get_lwp_thread (lwp
);
4257 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4258 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
4260 current_thread
= thread
;
4261 std::vector
<CORE_ADDR
> next_pcs
= the_low_target
.get_next_pcs (regcache
);
4263 for (CORE_ADDR pc
: next_pcs
)
4264 set_single_step_breakpoint (pc
, current_ptid
);
4266 do_cleanups (old_chain
);
4269 /* Single step via hardware or software single step.
4270 Return 1 if hardware single stepping, 0 if software single stepping
4271 or can't single step. */
4274 single_step (struct lwp_info
* lwp
)
4278 if (can_hardware_single_step ())
4282 else if (can_software_single_step ())
4284 install_software_single_step_breakpoints (lwp
);
4290 debug_printf ("stepping is not implemented on this target");
4296 /* The signal can be delivered to the inferior if we are not trying to
4297 finish a fast tracepoint collect. Since signal can be delivered in
4298 the step-over, the program may go to signal handler and trap again
4299 after return from the signal handler. We can live with the spurious
4303 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4305 return (lwp
->collecting_fast_tracepoint
4306 == fast_tpoint_collect_result::not_collecting
);
4309 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4310 SIGNAL is nonzero, give it that signal. */
4313 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4314 int step
, int signal
, siginfo_t
*info
)
4316 struct thread_info
*thread
= get_lwp_thread (lwp
);
4317 struct thread_info
*saved_thread
;
4319 struct process_info
*proc
= get_thread_process (thread
);
4321 /* Note that target description may not be initialised
4322 (proc->tdesc == NULL) at this point because the program hasn't
4323 stopped at the first instruction yet. It means GDBserver skips
4324 the extra traps from the wrapper program (see option --wrapper).
4325 Code in this function that requires register access should be
4326 guarded by proc->tdesc == NULL or something else. */
4328 if (lwp
->stopped
== 0)
4331 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4333 fast_tpoint_collect_result fast_tp_collecting
4334 = lwp
->collecting_fast_tracepoint
;
4336 gdb_assert (!stabilizing_threads
4337 || (fast_tp_collecting
4338 != fast_tpoint_collect_result::not_collecting
));
4340 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4341 user used the "jump" command, or "set $pc = foo"). */
4342 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4344 /* Collecting 'while-stepping' actions doesn't make sense
4346 release_while_stepping_state_list (thread
);
4349 /* If we have pending signals or status, and a new signal, enqueue the
4350 signal. Also enqueue the signal if it can't be delivered to the
4351 inferior right now. */
4353 && (lwp
->status_pending_p
4354 || lwp
->pending_signals
!= NULL
4355 || !lwp_signal_can_be_delivered (lwp
)))
4357 enqueue_pending_signal (lwp
, signal
, info
);
4359 /* Postpone any pending signal. It was enqueued above. */
4363 if (lwp
->status_pending_p
)
4366 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4367 " has pending status\n",
4368 lwpid_of (thread
), step
? "step" : "continue",
4369 lwp
->stop_expected
? "expected" : "not expected");
4373 saved_thread
= current_thread
;
4374 current_thread
= thread
;
4376 /* This bit needs some thinking about. If we get a signal that
4377 we must report while a single-step reinsert is still pending,
4378 we often end up resuming the thread. It might be better to
4379 (ew) allow a stack of pending events; then we could be sure that
4380 the reinsert happened right away and not lose any signals.
4382 Making this stack would also shrink the window in which breakpoints are
4383 uninserted (see comment in linux_wait_for_lwp) but not enough for
4384 complete correctness, so it won't solve that problem. It may be
4385 worthwhile just to solve this one, however. */
4386 if (lwp
->bp_reinsert
!= 0)
4389 debug_printf (" pending reinsert at 0x%s\n",
4390 paddress (lwp
->bp_reinsert
));
4392 if (can_hardware_single_step ())
4394 if (fast_tp_collecting
== fast_tpoint_collect_result::not_collecting
)
4397 warning ("BAD - reinserting but not stepping.");
4399 warning ("BAD - reinserting and suspended(%d).",
4404 step
= maybe_hw_step (thread
);
4407 if (fast_tp_collecting
== fast_tpoint_collect_result::before_insn
)
4410 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4411 " (exit-jump-pad-bkpt)\n",
4414 else if (fast_tp_collecting
== fast_tpoint_collect_result::at_insn
)
4417 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4418 " single-stepping\n",
4421 if (can_hardware_single_step ())
4425 internal_error (__FILE__
, __LINE__
,
4426 "moving out of jump pad single-stepping"
4427 " not implemented on this target");
4431 /* If we have while-stepping actions in this thread set it stepping.
4432 If we have a signal to deliver, it may or may not be set to
4433 SIG_IGN, we don't know. Assume so, and allow collecting
4434 while-stepping into a signal handler. A possible smart thing to
4435 do would be to set an internal breakpoint at the signal return
4436 address, continue, and carry on catching this while-stepping
4437 action only when that breakpoint is hit. A future
4439 if (thread
->while_stepping
!= NULL
)
4442 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4445 step
= single_step (lwp
);
4448 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4450 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4452 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4456 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4457 (long) lwp
->stop_pc
);
4461 /* If we have pending signals, consume one if it can be delivered to
4463 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4465 struct pending_signals
**p_sig
;
4467 p_sig
= &lwp
->pending_signals
;
4468 while ((*p_sig
)->prev
!= NULL
)
4469 p_sig
= &(*p_sig
)->prev
;
4471 signal
= (*p_sig
)->signal
;
4472 if ((*p_sig
)->info
.si_signo
!= 0)
4473 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4481 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4482 lwpid_of (thread
), step
? "step" : "continue", signal
,
4483 lwp
->stop_expected
? "expected" : "not expected");
4485 if (the_low_target
.prepare_to_resume
!= NULL
)
4486 the_low_target
.prepare_to_resume (lwp
);
4488 regcache_invalidate_thread (thread
);
4490 lwp
->stepping
= step
;
4492 ptrace_request
= PTRACE_SINGLESTEP
;
4493 else if (gdb_catching_syscalls_p (lwp
))
4494 ptrace_request
= PTRACE_SYSCALL
;
4496 ptrace_request
= PTRACE_CONT
;
4497 ptrace (ptrace_request
,
4499 (PTRACE_TYPE_ARG3
) 0,
4500 /* Coerce to a uintptr_t first to avoid potential gcc warning
4501 of coercing an 8 byte integer to a 4 byte pointer. */
4502 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4504 current_thread
= saved_thread
;
4506 perror_with_name ("resuming thread");
4508 /* Successfully resumed. Clear state that no longer makes sense,
4509 and mark the LWP as running. Must not do this before resuming
4510 otherwise if that fails other code will be confused. E.g., we'd
4511 later try to stop the LWP and hang forever waiting for a stop
4512 status. Note that we must not throw after this is cleared,
4513 otherwise handle_zombie_lwp_error would get confused. */
4515 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4518 /* Called when we try to resume a stopped LWP and that errors out. If
4519 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4520 or about to become), discard the error, clear any pending status
4521 the LWP may have, and return true (we'll collect the exit status
4522 soon enough). Otherwise, return false. */
4525 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4527 struct thread_info
*thread
= get_lwp_thread (lp
);
4529 /* If we get an error after resuming the LWP successfully, we'd
4530 confuse !T state for the LWP being gone. */
4531 gdb_assert (lp
->stopped
);
4533 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4534 because even if ptrace failed with ESRCH, the tracee may be "not
4535 yet fully dead", but already refusing ptrace requests. In that
4536 case the tracee has 'R (Running)' state for a little bit
4537 (observed in Linux 3.18). See also the note on ESRCH in the
4538 ptrace(2) man page. Instead, check whether the LWP has any state
4539 other than ptrace-stopped. */
4541 /* Don't assume anything if /proc/PID/status can't be read. */
4542 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4544 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4545 lp
->status_pending_p
= 0;
4551 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4552 disappears while we try to resume it. */
4555 linux_resume_one_lwp (struct lwp_info
*lwp
,
4556 int step
, int signal
, siginfo_t
*info
)
4560 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4562 CATCH (ex
, RETURN_MASK_ERROR
)
4564 if (!check_ptrace_stopped_lwp_gone (lwp
))
4565 throw_exception (ex
);
4570 /* This function is called once per thread via for_each_thread.
4571 We look up which resume request applies to THREAD and mark it with a
4572 pointer to the appropriate resume request.
4574 This algorithm is O(threads * resume elements), but resume elements
4575 is small (and will remain small at least until GDB supports thread
4579 linux_set_resume_request (thread_info
*thread
, thread_resume
*resume
, size_t n
)
4581 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4583 for (int ndx
= 0; ndx
< n
; ndx
++)
4585 ptid_t ptid
= resume
[ndx
].thread
;
4586 if (ptid_equal (ptid
, minus_one_ptid
)
4587 || ptid
== thread
->id
4588 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4590 || (ptid_get_pid (ptid
) == pid_of (thread
)
4591 && (ptid_is_pid (ptid
)
4592 || ptid_get_lwp (ptid
) == -1)))
4594 if (resume
[ndx
].kind
== resume_stop
4595 && thread
->last_resume_kind
== resume_stop
)
4598 debug_printf ("already %s LWP %ld at GDB's request\n",
4599 (thread
->last_status
.kind
4600 == TARGET_WAITKIND_STOPPED
)
4608 /* Ignore (wildcard) resume requests for already-resumed
4610 if (resume
[ndx
].kind
!= resume_stop
4611 && thread
->last_resume_kind
!= resume_stop
)
4614 debug_printf ("already %s LWP %ld at GDB's request\n",
4615 (thread
->last_resume_kind
4623 /* Don't let wildcard resumes resume fork children that GDB
4624 does not yet know are new fork children. */
4625 if (lwp
->fork_relative
!= NULL
)
4627 struct lwp_info
*rel
= lwp
->fork_relative
;
4629 if (rel
->status_pending_p
4630 && (rel
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
4631 || rel
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
))
4634 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4640 /* If the thread has a pending event that has already been
4641 reported to GDBserver core, but GDB has not pulled the
4642 event out of the vStopped queue yet, likewise, ignore the
4643 (wildcard) resume request. */
4644 if (in_queued_stop_replies (thread
->id
))
4647 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4652 lwp
->resume
= &resume
[ndx
];
4653 thread
->last_resume_kind
= lwp
->resume
->kind
;
4655 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4656 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4658 /* If we had a deferred signal to report, dequeue one now.
4659 This can happen if LWP gets more than one signal while
4660 trying to get out of a jump pad. */
4662 && !lwp
->status_pending_p
4663 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4665 lwp
->status_pending_p
= 1;
4668 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4669 "leaving status pending.\n",
4670 WSTOPSIG (lwp
->status_pending
),
4678 /* No resume action for this thread. */
4682 /* find_inferior callback for linux_resume.
4683 Set *FLAG_P if this lwp has an interesting status pending. */
4686 resume_status_pending_p (thread_info
*thread
)
4688 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4690 /* LWPs which will not be resumed are not interesting, because
4691 we might not wait for them next time through linux_wait. */
4692 if (lwp
->resume
== NULL
)
4695 return thread_still_has_status_pending_p (thread
);
4698 /* Return 1 if this lwp that GDB wants running is stopped at an
4699 internal breakpoint that we need to step over. It assumes that any
4700 required STOP_PC adjustment has already been propagated to the
4701 inferior's regcache. */
4704 need_step_over_p (thread_info
*thread
)
4706 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4707 struct thread_info
*saved_thread
;
4709 struct process_info
*proc
= get_thread_process (thread
);
4711 /* GDBserver is skipping the extra traps from the wrapper program,
4712 don't have to do step over. */
4713 if (proc
->tdesc
== NULL
)
4716 /* LWPs which will not be resumed are not interesting, because we
4717 might not wait for them next time through linux_wait. */
4722 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4727 if (thread
->last_resume_kind
== resume_stop
)
4730 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4736 gdb_assert (lwp
->suspended
>= 0);
4741 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4746 if (lwp
->status_pending_p
)
4749 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4755 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4759 /* If the PC has changed since we stopped, then don't do anything,
4760 and let the breakpoint/tracepoint be hit. This happens if, for
4761 instance, GDB handled the decr_pc_after_break subtraction itself,
4762 GDB is OOL stepping this thread, or the user has issued a "jump"
4763 command, or poked thread's registers herself. */
4764 if (pc
!= lwp
->stop_pc
)
4767 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4768 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4770 paddress (lwp
->stop_pc
), paddress (pc
));
4774 /* On software single step target, resume the inferior with signal
4775 rather than stepping over. */
4776 if (can_software_single_step ()
4777 && lwp
->pending_signals
!= NULL
4778 && lwp_signal_can_be_delivered (lwp
))
4781 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4788 saved_thread
= current_thread
;
4789 current_thread
= thread
;
4791 /* We can only step over breakpoints we know about. */
4792 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4794 /* Don't step over a breakpoint that GDB expects to hit
4795 though. If the condition is being evaluated on the target's side
4796 and it evaluate to false, step over this breakpoint as well. */
4797 if (gdb_breakpoint_here (pc
)
4798 && gdb_condition_true_at_breakpoint (pc
)
4799 && gdb_no_commands_at_breakpoint (pc
))
4802 debug_printf ("Need step over [LWP %ld]? yes, but found"
4803 " GDB breakpoint at 0x%s; skipping step over\n",
4804 lwpid_of (thread
), paddress (pc
));
4806 current_thread
= saved_thread
;
4812 debug_printf ("Need step over [LWP %ld]? yes, "
4813 "found breakpoint at 0x%s\n",
4814 lwpid_of (thread
), paddress (pc
));
4816 /* We've found an lwp that needs stepping over --- return 1 so
4817 that find_inferior stops looking. */
4818 current_thread
= saved_thread
;
4824 current_thread
= saved_thread
;
4827 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4829 lwpid_of (thread
), paddress (pc
));
4834 /* Start a step-over operation on LWP. When LWP stopped at a
4835 breakpoint, to make progress, we need to remove the breakpoint out
4836 of the way. If we let other threads run while we do that, they may
4837 pass by the breakpoint location and miss hitting it. To avoid
4838 that, a step-over momentarily stops all threads while LWP is
4839 single-stepped by either hardware or software while the breakpoint
4840 is temporarily uninserted from the inferior. When the single-step
4841 finishes, we reinsert the breakpoint, and let all threads that are
4842 supposed to be running, run again. */
4845 start_step_over (struct lwp_info
*lwp
)
4847 struct thread_info
*thread
= get_lwp_thread (lwp
);
4848 struct thread_info
*saved_thread
;
4853 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4856 stop_all_lwps (1, lwp
);
4858 if (lwp
->suspended
!= 0)
4860 internal_error (__FILE__
, __LINE__
,
4861 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4866 debug_printf ("Done stopping all threads for step-over.\n");
4868 /* Note, we should always reach here with an already adjusted PC,
4869 either by GDB (if we're resuming due to GDB's request), or by our
4870 caller, if we just finished handling an internal breakpoint GDB
4871 shouldn't care about. */
4874 saved_thread
= current_thread
;
4875 current_thread
= thread
;
4877 lwp
->bp_reinsert
= pc
;
4878 uninsert_breakpoints_at (pc
);
4879 uninsert_fast_tracepoint_jumps_at (pc
);
4881 step
= single_step (lwp
);
4883 current_thread
= saved_thread
;
4885 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4887 /* Require next event from this LWP. */
4888 step_over_bkpt
= thread
->id
;
4892 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4893 start_step_over, if still there, and delete any single-step
4894 breakpoints we've set, on non hardware single-step targets. */
4897 finish_step_over (struct lwp_info
*lwp
)
4899 if (lwp
->bp_reinsert
!= 0)
4901 struct thread_info
*saved_thread
= current_thread
;
4904 debug_printf ("Finished step over.\n");
4906 current_thread
= get_lwp_thread (lwp
);
4908 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4909 may be no breakpoint to reinsert there by now. */
4910 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4911 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4913 lwp
->bp_reinsert
= 0;
4915 /* Delete any single-step breakpoints. No longer needed. We
4916 don't have to worry about other threads hitting this trap,
4917 and later not being able to explain it, because we were
4918 stepping over a breakpoint, and we hold all threads but
4919 LWP stopped while doing that. */
4920 if (!can_hardware_single_step ())
4922 gdb_assert (has_single_step_breakpoints (current_thread
));
4923 delete_single_step_breakpoints (current_thread
);
4926 step_over_bkpt
= null_ptid
;
4927 current_thread
= saved_thread
;
4934 /* If there's a step over in progress, wait until all threads stop
4935 (that is, until the stepping thread finishes its step), and
4936 unsuspend all lwps. The stepping thread ends with its status
4937 pending, which is processed later when we get back to processing
4941 complete_ongoing_step_over (void)
4943 if (!ptid_equal (step_over_bkpt
, null_ptid
))
4945 struct lwp_info
*lwp
;
4950 debug_printf ("detach: step over in progress, finish it first\n");
4952 /* Passing NULL_PTID as filter indicates we want all events to
4953 be left pending. Eventually this returns when there are no
4954 unwaited-for children left. */
4955 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4957 gdb_assert (ret
== -1);
4959 lwp
= find_lwp_pid (step_over_bkpt
);
4961 finish_step_over (lwp
);
4962 step_over_bkpt
= null_ptid
;
4963 unsuspend_all_lwps (lwp
);
4967 /* This function is called once per thread. We check the thread's resume
4968 request, which will tell us whether to resume, step, or leave the thread
4969 stopped; and what signal, if any, it should be sent.
4971 For threads which we aren't explicitly told otherwise, we preserve
4972 the stepping flag; this is used for stepping over gdbserver-placed
4975 If pending_flags was set in any thread, we queue any needed
4976 signals, since we won't actually resume. We already have a pending
4977 event to report, so we don't need to preserve any step requests;
4978 they should be re-issued if necessary. */
4981 linux_resume_one_thread (thread_info
*thread
, void *arg
)
4983 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4984 int leave_all_stopped
= * (int *) arg
;
4987 if (lwp
->resume
== NULL
)
4990 if (lwp
->resume
->kind
== resume_stop
)
4993 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4998 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
5000 /* Stop the thread, and wait for the event asynchronously,
5001 through the event loop. */
5007 debug_printf ("already stopped LWP %ld\n",
5010 /* The LWP may have been stopped in an internal event that
5011 was not meant to be notified back to GDB (e.g., gdbserver
5012 breakpoint), so we should be reporting a stop event in
5015 /* If the thread already has a pending SIGSTOP, this is a
5016 no-op. Otherwise, something later will presumably resume
5017 the thread and this will cause it to cancel any pending
5018 operation, due to last_resume_kind == resume_stop. If
5019 the thread already has a pending status to report, we
5020 will still report it the next time we wait - see
5021 status_pending_p_callback. */
5023 /* If we already have a pending signal to report, then
5024 there's no need to queue a SIGSTOP, as this means we're
5025 midway through moving the LWP out of the jumppad, and we
5026 will report the pending signal as soon as that is
5028 if (lwp
->pending_signals_to_report
== NULL
)
5032 /* For stop requests, we're done. */
5034 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5038 /* If this thread which is about to be resumed has a pending status,
5039 then don't resume it - we can just report the pending status.
5040 Likewise if it is suspended, because e.g., another thread is
5041 stepping past a breakpoint. Make sure to queue any signals that
5042 would otherwise be sent. In all-stop mode, we do this decision
5043 based on if *any* thread has a pending status. If there's a
5044 thread that needs the step-over-breakpoint dance, then don't
5045 resume any other thread but that particular one. */
5046 leave_pending
= (lwp
->suspended
5047 || lwp
->status_pending_p
5048 || leave_all_stopped
);
5050 /* If we have a new signal, enqueue the signal. */
5051 if (lwp
->resume
->sig
!= 0)
5053 siginfo_t info
, *info_p
;
5055 /* If this is the same signal we were previously stopped by,
5056 make sure to queue its siginfo. */
5057 if (WIFSTOPPED (lwp
->last_status
)
5058 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
5059 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
5060 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
5065 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
5071 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
5073 proceed_one_lwp (thread
, NULL
);
5078 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5081 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5087 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5089 struct thread_info
*need_step_over
= NULL
;
5090 int leave_all_stopped
;
5095 debug_printf ("linux_resume:\n");
5098 for_each_thread ([&] (thread_info
*thread
)
5100 linux_set_resume_request (thread
, resume_info
, n
);
5103 /* If there is a thread which would otherwise be resumed, which has
5104 a pending status, then don't resume any threads - we can just
5105 report the pending status. Make sure to queue any signals that
5106 would otherwise be sent. In non-stop mode, we'll apply this
5107 logic to each thread individually. We consume all pending events
5108 before considering to start a step-over (in all-stop). */
5109 bool any_pending
= false;
5111 any_pending
= find_thread (resume_status_pending_p
) != NULL
;
5113 /* If there is a thread which would otherwise be resumed, which is
5114 stopped at a breakpoint that needs stepping over, then don't
5115 resume any threads - have it step over the breakpoint with all
5116 other threads stopped, then resume all threads again. Make sure
5117 to queue any signals that would otherwise be delivered or
5119 if (!any_pending
&& supports_breakpoints ())
5120 need_step_over
= find_thread (need_step_over_p
);
5122 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5126 if (need_step_over
!= NULL
)
5127 debug_printf ("Not resuming all, need step over\n");
5128 else if (any_pending
)
5129 debug_printf ("Not resuming, all-stop and found "
5130 "an LWP with pending status\n");
5132 debug_printf ("Resuming, no pending status or step over needed\n");
5135 /* Even if we're leaving threads stopped, queue all signals we'd
5136 otherwise deliver. */
5137 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
5140 start_step_over (get_thread_lwp (need_step_over
));
5144 debug_printf ("linux_resume done\n");
5148 /* We may have events that were pending that can/should be sent to
5149 the client now. Trigger a linux_wait call. */
5150 if (target_is_async_p ())
5154 /* This function is called once per thread. We check the thread's
5155 last resume request, which will tell us whether to resume, step, or
5156 leave the thread stopped. Any signal the client requested to be
5157 delivered has already been enqueued at this point.
5159 If any thread that GDB wants running is stopped at an internal
5160 breakpoint that needs stepping over, we start a step-over operation
5161 on that particular thread, and leave all others stopped. */
5164 proceed_one_lwp (thread_info
*thread
, void *except
)
5166 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5173 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5178 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5182 if (thread
->last_resume_kind
== resume_stop
5183 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5186 debug_printf (" client wants LWP to remain %ld stopped\n",
5191 if (lwp
->status_pending_p
)
5194 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5199 gdb_assert (lwp
->suspended
>= 0);
5204 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5208 if (thread
->last_resume_kind
== resume_stop
5209 && lwp
->pending_signals_to_report
== NULL
5210 && (lwp
->collecting_fast_tracepoint
5211 == fast_tpoint_collect_result::not_collecting
))
5213 /* We haven't reported this LWP as stopped yet (otherwise, the
5214 last_status.kind check above would catch it, and we wouldn't
5215 reach here. This LWP may have been momentarily paused by a
5216 stop_all_lwps call while handling for example, another LWP's
5217 step-over. In that case, the pending expected SIGSTOP signal
5218 that was queued at vCont;t handling time will have already
5219 been consumed by wait_for_sigstop, and so we need to requeue
5220 another one here. Note that if the LWP already has a SIGSTOP
5221 pending, this is a no-op. */
5224 debug_printf ("Client wants LWP %ld to stop. "
5225 "Making sure it has a SIGSTOP pending\n",
5231 if (thread
->last_resume_kind
== resume_step
)
5234 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5237 /* If resume_step is requested by GDB, install single-step
5238 breakpoints when the thread is about to be actually resumed if
5239 the single-step breakpoints weren't removed. */
5240 if (can_software_single_step ()
5241 && !has_single_step_breakpoints (thread
))
5242 install_software_single_step_breakpoints (lwp
);
5244 step
= maybe_hw_step (thread
);
5246 else if (lwp
->bp_reinsert
!= 0)
5249 debug_printf (" stepping LWP %ld, reinsert set\n",
5252 step
= maybe_hw_step (thread
);
5257 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5262 unsuspend_and_proceed_one_lwp (thread_info
*thread
, void *except
)
5264 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5269 lwp_suspended_decr (lwp
);
5271 return proceed_one_lwp (thread
, except
);
5274 /* When we finish a step-over, set threads running again. If there's
5275 another thread that may need a step-over, now's the time to start
5276 it. Eventually, we'll move all threads past their breakpoints. */
5279 proceed_all_lwps (void)
5281 struct thread_info
*need_step_over
;
5283 /* If there is a thread which would otherwise be resumed, which is
5284 stopped at a breakpoint that needs stepping over, then don't
5285 resume any threads - have it step over the breakpoint with all
5286 other threads stopped, then resume all threads again. */
5288 if (supports_breakpoints ())
5290 need_step_over
= find_thread (need_step_over_p
);
5292 if (need_step_over
!= NULL
)
5295 debug_printf ("proceed_all_lwps: found "
5296 "thread %ld needing a step-over\n",
5297 lwpid_of (need_step_over
));
5299 start_step_over (get_thread_lwp (need_step_over
));
5305 debug_printf ("Proceeding, no step-over needed\n");
5307 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
5310 /* Stopped LWPs that the client wanted to be running, that don't have
5311 pending statuses, are set to run again, except for EXCEPT, if not
5312 NULL. This undoes a stop_all_lwps call. */
5315 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5321 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5322 lwpid_of (get_lwp_thread (except
)));
5324 debug_printf ("unstopping all lwps\n");
5328 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
5330 find_inferior (&all_threads
, proceed_one_lwp
, except
);
5334 debug_printf ("unstop_all_lwps done\n");
5340 #ifdef HAVE_LINUX_REGSETS
5342 #define use_linux_regsets 1
5344 /* Returns true if REGSET has been disabled. */
5347 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5349 return (info
->disabled_regsets
!= NULL
5350 && info
->disabled_regsets
[regset
- info
->regsets
]);
5353 /* Disable REGSET. */
5356 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5360 dr_offset
= regset
- info
->regsets
;
5361 if (info
->disabled_regsets
== NULL
)
5362 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5363 info
->disabled_regsets
[dr_offset
] = 1;
5367 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5368 struct regcache
*regcache
)
5370 struct regset_info
*regset
;
5371 int saw_general_regs
= 0;
5375 pid
= lwpid_of (current_thread
);
5376 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5381 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5384 buf
= xmalloc (regset
->size
);
5386 nt_type
= regset
->nt_type
;
5390 iov
.iov_len
= regset
->size
;
5391 data
= (void *) &iov
;
5397 res
= ptrace (regset
->get_request
, pid
,
5398 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5400 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5406 /* If we get EIO on a regset, do not try it again for
5407 this process mode. */
5408 disable_regset (regsets_info
, regset
);
5410 else if (errno
== ENODATA
)
5412 /* ENODATA may be returned if the regset is currently
5413 not "active". This can happen in normal operation,
5414 so suppress the warning in this case. */
5416 else if (errno
== ESRCH
)
5418 /* At this point, ESRCH should mean the process is
5419 already gone, in which case we simply ignore attempts
5420 to read its registers. */
5425 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5432 if (regset
->type
== GENERAL_REGS
)
5433 saw_general_regs
= 1;
5434 regset
->store_function (regcache
, buf
);
5438 if (saw_general_regs
)
5445 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5446 struct regcache
*regcache
)
5448 struct regset_info
*regset
;
5449 int saw_general_regs
= 0;
5453 pid
= lwpid_of (current_thread
);
5454 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5459 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5460 || regset
->fill_function
== NULL
)
5463 buf
= xmalloc (regset
->size
);
5465 /* First fill the buffer with the current register set contents,
5466 in case there are any items in the kernel's regset that are
5467 not in gdbserver's regcache. */
5469 nt_type
= regset
->nt_type
;
5473 iov
.iov_len
= regset
->size
;
5474 data
= (void *) &iov
;
5480 res
= ptrace (regset
->get_request
, pid
,
5481 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5483 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5488 /* Then overlay our cached registers on that. */
5489 regset
->fill_function (regcache
, buf
);
5491 /* Only now do we write the register set. */
5493 res
= ptrace (regset
->set_request
, pid
,
5494 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5496 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5504 /* If we get EIO on a regset, do not try it again for
5505 this process mode. */
5506 disable_regset (regsets_info
, regset
);
5508 else if (errno
== ESRCH
)
5510 /* At this point, ESRCH should mean the process is
5511 already gone, in which case we simply ignore attempts
5512 to change its registers. See also the related
5513 comment in linux_resume_one_lwp. */
5519 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5522 else if (regset
->type
== GENERAL_REGS
)
5523 saw_general_regs
= 1;
5526 if (saw_general_regs
)
5532 #else /* !HAVE_LINUX_REGSETS */
5534 #define use_linux_regsets 0
5535 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5536 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5540 /* Return 1 if register REGNO is supported by one of the regset ptrace
5541 calls or 0 if it has to be transferred individually. */
5544 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5546 unsigned char mask
= 1 << (regno
% 8);
5547 size_t index
= regno
/ 8;
5549 return (use_linux_regsets
5550 && (regs_info
->regset_bitmap
== NULL
5551 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5554 #ifdef HAVE_LINUX_USRREGS
5557 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5561 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5562 error ("Invalid register number %d.", regnum
);
5564 addr
= usrregs
->regmap
[regnum
];
5569 /* Fetch one register. */
5571 fetch_register (const struct usrregs_info
*usrregs
,
5572 struct regcache
*regcache
, int regno
)
5579 if (regno
>= usrregs
->num_regs
)
5581 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5584 regaddr
= register_addr (usrregs
, regno
);
5588 size
= ((register_size (regcache
->tdesc
, regno
)
5589 + sizeof (PTRACE_XFER_TYPE
) - 1)
5590 & -sizeof (PTRACE_XFER_TYPE
));
5591 buf
= (char *) alloca (size
);
5593 pid
= lwpid_of (current_thread
);
5594 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5597 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5598 ptrace (PTRACE_PEEKUSER
, pid
,
5599 /* Coerce to a uintptr_t first to avoid potential gcc warning
5600 of coercing an 8 byte integer to a 4 byte pointer. */
5601 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5602 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5604 error ("reading register %d: %s", regno
, strerror (errno
));
5607 if (the_low_target
.supply_ptrace_register
)
5608 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5610 supply_register (regcache
, regno
, buf
);
5613 /* Store one register. */
5615 store_register (const struct usrregs_info
*usrregs
,
5616 struct regcache
*regcache
, int regno
)
5623 if (regno
>= usrregs
->num_regs
)
5625 if ((*the_low_target
.cannot_store_register
) (regno
))
5628 regaddr
= register_addr (usrregs
, regno
);
5632 size
= ((register_size (regcache
->tdesc
, regno
)
5633 + sizeof (PTRACE_XFER_TYPE
) - 1)
5634 & -sizeof (PTRACE_XFER_TYPE
));
5635 buf
= (char *) alloca (size
);
5636 memset (buf
, 0, size
);
5638 if (the_low_target
.collect_ptrace_register
)
5639 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5641 collect_register (regcache
, regno
, buf
);
5643 pid
= lwpid_of (current_thread
);
5644 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5647 ptrace (PTRACE_POKEUSER
, pid
,
5648 /* Coerce to a uintptr_t first to avoid potential gcc warning
5649 about coercing an 8 byte integer to a 4 byte pointer. */
5650 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5651 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5654 /* At this point, ESRCH should mean the process is
5655 already gone, in which case we simply ignore attempts
5656 to change its registers. See also the related
5657 comment in linux_resume_one_lwp. */
5661 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5662 error ("writing register %d: %s", regno
, strerror (errno
));
5664 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5668 /* Fetch all registers, or just one, from the child process.
5669 If REGNO is -1, do this for all registers, skipping any that are
5670 assumed to have been retrieved by regsets_fetch_inferior_registers,
5671 unless ALL is non-zero.
5672 Otherwise, REGNO specifies which register (so we can save time). */
5674 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5675 struct regcache
*regcache
, int regno
, int all
)
5677 struct usrregs_info
*usr
= regs_info
->usrregs
;
5681 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5682 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5683 fetch_register (usr
, regcache
, regno
);
5686 fetch_register (usr
, regcache
, regno
);
5689 /* Store our register values back into the inferior.
5690 If REGNO is -1, do this for all registers, skipping any that are
5691 assumed to have been saved by regsets_store_inferior_registers,
5692 unless ALL is non-zero.
5693 Otherwise, REGNO specifies which register (so we can save time). */
5695 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5696 struct regcache
*regcache
, int regno
, int all
)
5698 struct usrregs_info
*usr
= regs_info
->usrregs
;
5702 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5703 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5704 store_register (usr
, regcache
, regno
);
5707 store_register (usr
, regcache
, regno
);
5710 #else /* !HAVE_LINUX_USRREGS */
5712 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5713 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5719 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5723 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5727 if (the_low_target
.fetch_register
!= NULL
5728 && regs_info
->usrregs
!= NULL
)
5729 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5730 (*the_low_target
.fetch_register
) (regcache
, regno
);
5732 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5733 if (regs_info
->usrregs
!= NULL
)
5734 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5738 if (the_low_target
.fetch_register
!= NULL
5739 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5742 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5744 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5746 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5747 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5752 linux_store_registers (struct regcache
*regcache
, int regno
)
5756 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5760 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5762 if (regs_info
->usrregs
!= NULL
)
5763 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5767 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5769 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5771 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5772 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5777 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5778 to debugger memory starting at MYADDR. */
5781 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5783 int pid
= lwpid_of (current_thread
);
5784 PTRACE_XFER_TYPE
*buffer
;
5792 /* Try using /proc. Don't bother for one word. */
5793 if (len
>= 3 * sizeof (long))
5797 /* We could keep this file open and cache it - possibly one per
5798 thread. That requires some juggling, but is even faster. */
5799 sprintf (filename
, "/proc/%d/mem", pid
);
5800 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5804 /* If pread64 is available, use it. It's faster if the kernel
5805 supports it (only one syscall), and it's 64-bit safe even on
5806 32-bit platforms (for instance, SPARC debugging a SPARC64
5809 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5812 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5813 bytes
= read (fd
, myaddr
, len
);
5820 /* Some data was read, we'll try to get the rest with ptrace. */
5830 /* Round starting address down to longword boundary. */
5831 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5832 /* Round ending address up; get number of longwords that makes. */
5833 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5834 / sizeof (PTRACE_XFER_TYPE
));
5835 /* Allocate buffer of that many longwords. */
5836 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5838 /* Read all the longwords */
5840 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5842 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5843 about coercing an 8 byte integer to a 4 byte pointer. */
5844 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5845 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5846 (PTRACE_TYPE_ARG4
) 0);
5852 /* Copy appropriate bytes out of the buffer. */
5855 i
*= sizeof (PTRACE_XFER_TYPE
);
5856 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5858 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5865 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5866 memory at MEMADDR. On failure (cannot write to the inferior)
5867 returns the value of errno. Always succeeds if LEN is zero. */
5870 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5873 /* Round starting address down to longword boundary. */
5874 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5875 /* Round ending address up; get number of longwords that makes. */
5877 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5878 / sizeof (PTRACE_XFER_TYPE
);
5880 /* Allocate buffer of that many longwords. */
5881 PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5883 int pid
= lwpid_of (current_thread
);
5887 /* Zero length write always succeeds. */
5893 /* Dump up to four bytes. */
5894 char str
[4 * 2 + 1];
5896 int dump
= len
< 4 ? len
: 4;
5898 for (i
= 0; i
< dump
; i
++)
5900 sprintf (p
, "%02x", myaddr
[i
]);
5905 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5906 str
, (long) memaddr
, pid
);
5909 /* Fill start and end extra bytes of buffer with existing memory data. */
5912 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5913 about coercing an 8 byte integer to a 4 byte pointer. */
5914 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5915 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5916 (PTRACE_TYPE_ARG4
) 0);
5924 = ptrace (PTRACE_PEEKTEXT
, pid
,
5925 /* Coerce to a uintptr_t first to avoid potential gcc warning
5926 about coercing an 8 byte integer to a 4 byte pointer. */
5927 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5928 * sizeof (PTRACE_XFER_TYPE
)),
5929 (PTRACE_TYPE_ARG4
) 0);
5934 /* Copy data to be written over corresponding part of buffer. */
5936 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5939 /* Write the entire buffer. */
5941 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5944 ptrace (PTRACE_POKETEXT
, pid
,
5945 /* Coerce to a uintptr_t first to avoid potential gcc warning
5946 about coercing an 8 byte integer to a 4 byte pointer. */
5947 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5948 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5957 linux_look_up_symbols (void)
5959 #ifdef USE_THREAD_DB
5960 struct process_info
*proc
= current_process ();
5962 if (proc
->priv
->thread_db
!= NULL
)
5970 linux_request_interrupt (void)
5972 /* Send a SIGINT to the process group. This acts just like the user
5973 typed a ^C on the controlling terminal. */
5974 kill (-signal_pid
, SIGINT
);
5977 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5978 to debugger memory starting at MYADDR. */
5981 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5983 char filename
[PATH_MAX
];
5985 int pid
= lwpid_of (current_thread
);
5987 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5989 fd
= open (filename
, O_RDONLY
);
5993 if (offset
!= (CORE_ADDR
) 0
5994 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5997 n
= read (fd
, myaddr
, len
);
6004 /* These breakpoint and watchpoint related wrapper functions simply
6005 pass on the function call if the target has registered a
6006 corresponding function. */
6009 linux_supports_z_point_type (char z_type
)
6011 return (the_low_target
.supports_z_point_type
!= NULL
6012 && the_low_target
.supports_z_point_type (z_type
));
6016 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6017 int size
, struct raw_breakpoint
*bp
)
6019 if (type
== raw_bkpt_type_sw
)
6020 return insert_memory_breakpoint (bp
);
6021 else if (the_low_target
.insert_point
!= NULL
)
6022 return the_low_target
.insert_point (type
, addr
, size
, bp
);
6024 /* Unsupported (see target.h). */
6029 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6030 int size
, struct raw_breakpoint
*bp
)
6032 if (type
== raw_bkpt_type_sw
)
6033 return remove_memory_breakpoint (bp
);
6034 else if (the_low_target
.remove_point
!= NULL
)
6035 return the_low_target
.remove_point (type
, addr
, size
, bp
);
6037 /* Unsupported (see target.h). */
6041 /* Implement the to_stopped_by_sw_breakpoint target_ops
6045 linux_stopped_by_sw_breakpoint (void)
6047 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6049 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
6052 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
6056 linux_supports_stopped_by_sw_breakpoint (void)
6058 return USE_SIGTRAP_SIGINFO
;
6061 /* Implement the to_stopped_by_hw_breakpoint target_ops
6065 linux_stopped_by_hw_breakpoint (void)
6067 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6069 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6072 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6076 linux_supports_stopped_by_hw_breakpoint (void)
6078 return USE_SIGTRAP_SIGINFO
;
6081 /* Implement the supports_hardware_single_step target_ops method. */
6084 linux_supports_hardware_single_step (void)
6086 return can_hardware_single_step ();
6090 linux_supports_software_single_step (void)
6092 return can_software_single_step ();
6096 linux_stopped_by_watchpoint (void)
6098 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6100 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6104 linux_stopped_data_address (void)
6106 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6108 return lwp
->stopped_data_address
;
6111 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6112 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6113 && defined(PT_TEXT_END_ADDR)
6115 /* This is only used for targets that define PT_TEXT_ADDR,
6116 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6117 the target has different ways of acquiring this information, like
6120 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6121 to tell gdb about. */
6124 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6126 unsigned long text
, text_end
, data
;
6127 int pid
= lwpid_of (current_thread
);
6131 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6132 (PTRACE_TYPE_ARG4
) 0);
6133 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6134 (PTRACE_TYPE_ARG4
) 0);
6135 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6136 (PTRACE_TYPE_ARG4
) 0);
6140 /* Both text and data offsets produced at compile-time (and so
6141 used by gdb) are relative to the beginning of the program,
6142 with the data segment immediately following the text segment.
6143 However, the actual runtime layout in memory may put the data
6144 somewhere else, so when we send gdb a data base-address, we
6145 use the real data base address and subtract the compile-time
6146 data base-address from it (which is just the length of the
6147 text segment). BSS immediately follows data in both
6150 *data_p
= data
- (text_end
- text
);
6159 linux_qxfer_osdata (const char *annex
,
6160 unsigned char *readbuf
, unsigned const char *writebuf
,
6161 CORE_ADDR offset
, int len
)
6163 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6166 /* Convert a native/host siginfo object, into/from the siginfo in the
6167 layout of the inferiors' architecture. */
6170 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6174 if (the_low_target
.siginfo_fixup
!= NULL
)
6175 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6177 /* If there was no callback, or the callback didn't do anything,
6178 then just do a straight memcpy. */
6182 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6184 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6189 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6190 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6194 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6196 if (current_thread
== NULL
)
6199 pid
= lwpid_of (current_thread
);
6202 debug_printf ("%s siginfo for lwp %d.\n",
6203 readbuf
!= NULL
? "Reading" : "Writing",
6206 if (offset
>= sizeof (siginfo
))
6209 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6212 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6213 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6214 inferior with a 64-bit GDBSERVER should look the same as debugging it
6215 with a 32-bit GDBSERVER, we need to convert it. */
6216 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6218 if (offset
+ len
> sizeof (siginfo
))
6219 len
= sizeof (siginfo
) - offset
;
6221 if (readbuf
!= NULL
)
6222 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6225 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6227 /* Convert back to ptrace layout before flushing it out. */
6228 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6230 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6237 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6238 so we notice when children change state; as the handler for the
6239 sigsuspend in my_waitpid. */
6242 sigchld_handler (int signo
)
6244 int old_errno
= errno
;
6250 /* fprintf is not async-signal-safe, so call write
6252 if (write (2, "sigchld_handler\n",
6253 sizeof ("sigchld_handler\n") - 1) < 0)
6254 break; /* just ignore */
6258 if (target_is_async_p ())
6259 async_file_mark (); /* trigger a linux_wait */
6265 linux_supports_non_stop (void)
6271 linux_async (int enable
)
6273 int previous
= target_is_async_p ();
6276 debug_printf ("linux_async (%d), previous=%d\n",
6279 if (previous
!= enable
)
6282 sigemptyset (&mask
);
6283 sigaddset (&mask
, SIGCHLD
);
6285 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6289 if (pipe (linux_event_pipe
) == -1)
6291 linux_event_pipe
[0] = -1;
6292 linux_event_pipe
[1] = -1;
6293 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6295 warning ("creating event pipe failed.");
6299 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6300 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6302 /* Register the event loop handler. */
6303 add_file_handler (linux_event_pipe
[0],
6304 handle_target_event
, NULL
);
6306 /* Always trigger a linux_wait. */
6311 delete_file_handler (linux_event_pipe
[0]);
6313 close (linux_event_pipe
[0]);
6314 close (linux_event_pipe
[1]);
6315 linux_event_pipe
[0] = -1;
6316 linux_event_pipe
[1] = -1;
6319 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6326 linux_start_non_stop (int nonstop
)
6328 /* Register or unregister from event-loop accordingly. */
6329 linux_async (nonstop
);
6331 if (target_is_async_p () != (nonstop
!= 0))
6338 linux_supports_multi_process (void)
6343 /* Check if fork events are supported. */
6346 linux_supports_fork_events (void)
6348 return linux_supports_tracefork ();
6351 /* Check if vfork events are supported. */
6354 linux_supports_vfork_events (void)
6356 return linux_supports_tracefork ();
6359 /* Check if exec events are supported. */
6362 linux_supports_exec_events (void)
6364 return linux_supports_traceexec ();
6367 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6368 ptrace flags for all inferiors. This is in case the new GDB connection
6369 doesn't support the same set of events that the previous one did. */
6372 linux_handle_new_gdb_connection (void)
6374 /* Request that all the lwps reset their ptrace options. */
6375 for_each_thread ([] (thread_info
*thread
)
6377 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6381 /* Stop the lwp so we can modify its ptrace options. */
6382 lwp
->must_set_ptrace_flags
= 1;
6383 linux_stop_lwp (lwp
);
6387 /* Already stopped; go ahead and set the ptrace options. */
6388 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6389 int options
= linux_low_ptrace_options (proc
->attached
);
6391 linux_enable_event_reporting (lwpid_of (thread
), options
);
6392 lwp
->must_set_ptrace_flags
= 0;
6398 linux_supports_disable_randomization (void)
6400 #ifdef HAVE_PERSONALITY
6408 linux_supports_agent (void)
6414 linux_supports_range_stepping (void)
6416 if (can_software_single_step ())
6418 if (*the_low_target
.supports_range_stepping
== NULL
)
6421 return (*the_low_target
.supports_range_stepping
) ();
6424 /* Enumerate spufs IDs for process PID. */
6426 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6432 struct dirent
*entry
;
6434 sprintf (path
, "/proc/%ld/fd", pid
);
6435 dir
= opendir (path
);
6440 while ((entry
= readdir (dir
)) != NULL
)
6446 fd
= atoi (entry
->d_name
);
6450 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6451 if (stat (path
, &st
) != 0)
6453 if (!S_ISDIR (st
.st_mode
))
6456 if (statfs (path
, &stfs
) != 0)
6458 if (stfs
.f_type
!= SPUFS_MAGIC
)
6461 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6463 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6473 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6474 object type, using the /proc file system. */
6476 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6477 unsigned const char *writebuf
,
6478 CORE_ADDR offset
, int len
)
6480 long pid
= lwpid_of (current_thread
);
6485 if (!writebuf
&& !readbuf
)
6493 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6496 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6497 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6502 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6509 ret
= write (fd
, writebuf
, (size_t) len
);
6511 ret
= read (fd
, readbuf
, (size_t) len
);
6517 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6518 struct target_loadseg
6520 /* Core address to which the segment is mapped. */
6522 /* VMA recorded in the program header. */
6524 /* Size of this segment in memory. */
6528 # if defined PT_GETDSBT
6529 struct target_loadmap
6531 /* Protocol version number, must be zero. */
6533 /* Pointer to the DSBT table, its size, and the DSBT index. */
6534 unsigned *dsbt_table
;
6535 unsigned dsbt_size
, dsbt_index
;
6536 /* Number of segments in this map. */
6538 /* The actual memory map. */
6539 struct target_loadseg segs
[/*nsegs*/];
6541 # define LINUX_LOADMAP PT_GETDSBT
6542 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6543 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6545 struct target_loadmap
6547 /* Protocol version number, must be zero. */
6549 /* Number of segments in this map. */
6551 /* The actual memory map. */
6552 struct target_loadseg segs
[/*nsegs*/];
6554 # define LINUX_LOADMAP PTRACE_GETFDPIC
6555 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6556 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6560 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6561 unsigned char *myaddr
, unsigned int len
)
6563 int pid
= lwpid_of (current_thread
);
6565 struct target_loadmap
*data
= NULL
;
6566 unsigned int actual_length
, copy_length
;
6568 if (strcmp (annex
, "exec") == 0)
6569 addr
= (int) LINUX_LOADMAP_EXEC
;
6570 else if (strcmp (annex
, "interp") == 0)
6571 addr
= (int) LINUX_LOADMAP_INTERP
;
6575 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6581 actual_length
= sizeof (struct target_loadmap
)
6582 + sizeof (struct target_loadseg
) * data
->nsegs
;
6584 if (offset
< 0 || offset
> actual_length
)
6587 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6588 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6592 # define linux_read_loadmap NULL
6593 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6596 linux_process_qsupported (char **features
, int count
)
6598 if (the_low_target
.process_qsupported
!= NULL
)
6599 the_low_target
.process_qsupported (features
, count
);
6603 linux_supports_catch_syscall (void)
6605 return (the_low_target
.get_syscall_trapinfo
!= NULL
6606 && linux_supports_tracesysgood ());
6610 linux_get_ipa_tdesc_idx (void)
6612 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6615 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6619 linux_supports_tracepoints (void)
6621 if (*the_low_target
.supports_tracepoints
== NULL
)
6624 return (*the_low_target
.supports_tracepoints
) ();
6628 linux_read_pc (struct regcache
*regcache
)
6630 if (the_low_target
.get_pc
== NULL
)
6633 return (*the_low_target
.get_pc
) (regcache
);
6637 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6639 gdb_assert (the_low_target
.set_pc
!= NULL
);
6641 (*the_low_target
.set_pc
) (regcache
, pc
);
6645 linux_thread_stopped (struct thread_info
*thread
)
6647 return get_thread_lwp (thread
)->stopped
;
6650 /* This exposes stop-all-threads functionality to other modules. */
6653 linux_pause_all (int freeze
)
6655 stop_all_lwps (freeze
, NULL
);
6658 /* This exposes unstop-all-threads functionality to other gdbserver
6662 linux_unpause_all (int unfreeze
)
6664 unstop_all_lwps (unfreeze
, NULL
);
6668 linux_prepare_to_access_memory (void)
6670 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6673 linux_pause_all (1);
6678 linux_done_accessing_memory (void)
6680 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6683 linux_unpause_all (1);
6687 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6688 CORE_ADDR collector
,
6691 CORE_ADDR
*jump_entry
,
6692 CORE_ADDR
*trampoline
,
6693 ULONGEST
*trampoline_size
,
6694 unsigned char *jjump_pad_insn
,
6695 ULONGEST
*jjump_pad_insn_size
,
6696 CORE_ADDR
*adjusted_insn_addr
,
6697 CORE_ADDR
*adjusted_insn_addr_end
,
6700 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6701 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6702 jump_entry
, trampoline
, trampoline_size
,
6703 jjump_pad_insn
, jjump_pad_insn_size
,
6704 adjusted_insn_addr
, adjusted_insn_addr_end
,
6708 static struct emit_ops
*
6709 linux_emit_ops (void)
6711 if (the_low_target
.emit_ops
!= NULL
)
6712 return (*the_low_target
.emit_ops
) ();
6718 linux_get_min_fast_tracepoint_insn_len (void)
6720 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6723 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6726 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6727 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6729 char filename
[PATH_MAX
];
6731 const int auxv_size
= is_elf64
6732 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6733 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6735 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6737 fd
= open (filename
, O_RDONLY
);
6743 while (read (fd
, buf
, auxv_size
) == auxv_size
6744 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6748 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6750 switch (aux
->a_type
)
6753 *phdr_memaddr
= aux
->a_un
.a_val
;
6756 *num_phdr
= aux
->a_un
.a_val
;
6762 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6764 switch (aux
->a_type
)
6767 *phdr_memaddr
= aux
->a_un
.a_val
;
6770 *num_phdr
= aux
->a_un
.a_val
;
6778 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6780 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6781 "phdr_memaddr = %ld, phdr_num = %d",
6782 (long) *phdr_memaddr
, *num_phdr
);
6789 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6792 get_dynamic (const int pid
, const int is_elf64
)
6794 CORE_ADDR phdr_memaddr
, relocation
;
6796 unsigned char *phdr_buf
;
6797 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6799 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6802 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6803 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6805 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6808 /* Compute relocation: it is expected to be 0 for "regular" executables,
6809 non-zero for PIE ones. */
6811 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6814 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6816 if (p
->p_type
== PT_PHDR
)
6817 relocation
= phdr_memaddr
- p
->p_vaddr
;
6821 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6823 if (p
->p_type
== PT_PHDR
)
6824 relocation
= phdr_memaddr
- p
->p_vaddr
;
6827 if (relocation
== -1)
6829 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6830 any real world executables, including PIE executables, have always
6831 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6832 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6833 or present DT_DEBUG anyway (fpc binaries are statically linked).
6835 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6837 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6842 for (i
= 0; i
< num_phdr
; i
++)
6846 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6848 if (p
->p_type
== PT_DYNAMIC
)
6849 return p
->p_vaddr
+ relocation
;
6853 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6855 if (p
->p_type
== PT_DYNAMIC
)
6856 return p
->p_vaddr
+ relocation
;
6863 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6864 can be 0 if the inferior does not yet have the library list initialized.
6865 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6866 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6869 get_r_debug (const int pid
, const int is_elf64
)
6871 CORE_ADDR dynamic_memaddr
;
6872 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6873 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6876 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6877 if (dynamic_memaddr
== 0)
6880 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6884 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6885 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6889 unsigned char buf
[sizeof (Elf64_Xword
)];
6893 #ifdef DT_MIPS_RLD_MAP
6894 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6896 if (linux_read_memory (dyn
->d_un
.d_val
,
6897 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6902 #endif /* DT_MIPS_RLD_MAP */
6903 #ifdef DT_MIPS_RLD_MAP_REL
6904 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6906 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6907 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6912 #endif /* DT_MIPS_RLD_MAP_REL */
6914 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6915 map
= dyn
->d_un
.d_val
;
6917 if (dyn
->d_tag
== DT_NULL
)
6922 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6923 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6927 unsigned char buf
[sizeof (Elf32_Word
)];
6931 #ifdef DT_MIPS_RLD_MAP
6932 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6934 if (linux_read_memory (dyn
->d_un
.d_val
,
6935 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6940 #endif /* DT_MIPS_RLD_MAP */
6941 #ifdef DT_MIPS_RLD_MAP_REL
6942 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6944 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6945 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6950 #endif /* DT_MIPS_RLD_MAP_REL */
6952 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6953 map
= dyn
->d_un
.d_val
;
6955 if (dyn
->d_tag
== DT_NULL
)
6959 dynamic_memaddr
+= dyn_size
;
6965 /* Read one pointer from MEMADDR in the inferior. */
6968 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6972 /* Go through a union so this works on either big or little endian
6973 hosts, when the inferior's pointer size is smaller than the size
6974 of CORE_ADDR. It is assumed the inferior's endianness is the
6975 same of the superior's. */
6978 CORE_ADDR core_addr
;
6983 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6986 if (ptr_size
== sizeof (CORE_ADDR
))
6987 *ptr
= addr
.core_addr
;
6988 else if (ptr_size
== sizeof (unsigned int))
6991 gdb_assert_not_reached ("unhandled pointer size");
6996 struct link_map_offsets
6998 /* Offset and size of r_debug.r_version. */
6999 int r_version_offset
;
7001 /* Offset and size of r_debug.r_map. */
7004 /* Offset to l_addr field in struct link_map. */
7007 /* Offset to l_name field in struct link_map. */
7010 /* Offset to l_ld field in struct link_map. */
7013 /* Offset to l_next field in struct link_map. */
7016 /* Offset to l_prev field in struct link_map. */
7020 /* Construct qXfer:libraries-svr4:read reply. */
7023 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
7024 unsigned const char *writebuf
,
7025 CORE_ADDR offset
, int len
)
7028 unsigned document_len
;
7029 struct process_info_private
*const priv
= current_process ()->priv
;
7030 char filename
[PATH_MAX
];
7033 static const struct link_map_offsets lmo_32bit_offsets
=
7035 0, /* r_version offset. */
7036 4, /* r_debug.r_map offset. */
7037 0, /* l_addr offset in link_map. */
7038 4, /* l_name offset in link_map. */
7039 8, /* l_ld offset in link_map. */
7040 12, /* l_next offset in link_map. */
7041 16 /* l_prev offset in link_map. */
7044 static const struct link_map_offsets lmo_64bit_offsets
=
7046 0, /* r_version offset. */
7047 8, /* r_debug.r_map offset. */
7048 0, /* l_addr offset in link_map. */
7049 8, /* l_name offset in link_map. */
7050 16, /* l_ld offset in link_map. */
7051 24, /* l_next offset in link_map. */
7052 32 /* l_prev offset in link_map. */
7054 const struct link_map_offsets
*lmo
;
7055 unsigned int machine
;
7057 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7058 int allocated
= 1024;
7060 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7061 int header_done
= 0;
7063 if (writebuf
!= NULL
)
7065 if (readbuf
== NULL
)
7068 pid
= lwpid_of (current_thread
);
7069 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7070 is_elf64
= elf_64_file_p (filename
, &machine
);
7071 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7072 ptr_size
= is_elf64
? 8 : 4;
7074 while (annex
[0] != '\0')
7080 sep
= strchr (annex
, '=');
7085 if (len
== 5 && startswith (annex
, "start"))
7087 else if (len
== 4 && startswith (annex
, "prev"))
7091 annex
= strchr (sep
, ';');
7098 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7105 if (priv
->r_debug
== 0)
7106 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7108 /* We failed to find DT_DEBUG. Such situation will not change
7109 for this inferior - do not retry it. Report it to GDB as
7110 E01, see for the reasons at the GDB solib-svr4.c side. */
7111 if (priv
->r_debug
== (CORE_ADDR
) -1)
7114 if (priv
->r_debug
!= 0)
7116 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7117 (unsigned char *) &r_version
,
7118 sizeof (r_version
)) != 0
7121 warning ("unexpected r_debug version %d", r_version
);
7123 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7124 &lm_addr
, ptr_size
) != 0)
7126 warning ("unable to read r_map from 0x%lx",
7127 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7132 document
= (char *) xmalloc (allocated
);
7133 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7134 p
= document
+ strlen (document
);
7137 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7138 &l_name
, ptr_size
) == 0
7139 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7140 &l_addr
, ptr_size
) == 0
7141 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7142 &l_ld
, ptr_size
) == 0
7143 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7144 &l_prev
, ptr_size
) == 0
7145 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7146 &l_next
, ptr_size
) == 0)
7148 unsigned char libname
[PATH_MAX
];
7150 if (lm_prev
!= l_prev
)
7152 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7153 (long) lm_prev
, (long) l_prev
);
7157 /* Ignore the first entry even if it has valid name as the first entry
7158 corresponds to the main executable. The first entry should not be
7159 skipped if the dynamic loader was loaded late by a static executable
7160 (see solib-svr4.c parameter ignore_first). But in such case the main
7161 executable does not have PT_DYNAMIC present and this function already
7162 exited above due to failed get_r_debug. */
7165 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7170 /* Not checking for error because reading may stop before
7171 we've got PATH_MAX worth of characters. */
7173 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7174 libname
[sizeof (libname
) - 1] = '\0';
7175 if (libname
[0] != '\0')
7177 /* 6x the size for xml_escape_text below. */
7178 size_t len
= 6 * strlen ((char *) libname
);
7182 /* Terminate `<library-list-svr4'. */
7187 while (allocated
< p
- document
+ len
+ 200)
7189 /* Expand to guarantee sufficient storage. */
7190 uintptr_t document_len
= p
- document
;
7192 document
= (char *) xrealloc (document
, 2 * allocated
);
7194 p
= document
+ document_len
;
7197 std::string name
= xml_escape_text ((char *) libname
);
7198 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7199 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7200 name
.c_str (), (unsigned long) lm_addr
,
7201 (unsigned long) l_addr
, (unsigned long) l_ld
);
7211 /* Empty list; terminate `<library-list-svr4'. */
7215 strcpy (p
, "</library-list-svr4>");
7217 document_len
= strlen (document
);
7218 if (offset
< document_len
)
7219 document_len
-= offset
;
7222 if (len
> document_len
)
7225 memcpy (readbuf
, document
+ offset
, len
);
7231 #ifdef HAVE_LINUX_BTRACE
7233 /* See to_disable_btrace target method. */
7236 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7238 enum btrace_error err
;
7240 err
= linux_disable_btrace (tinfo
);
7241 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7244 /* Encode an Intel Processor Trace configuration. */
7247 linux_low_encode_pt_config (struct buffer
*buffer
,
7248 const struct btrace_data_pt_config
*config
)
7250 buffer_grow_str (buffer
, "<pt-config>\n");
7252 switch (config
->cpu
.vendor
)
7255 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7256 "model=\"%u\" stepping=\"%u\"/>\n",
7257 config
->cpu
.family
, config
->cpu
.model
,
7258 config
->cpu
.stepping
);
7265 buffer_grow_str (buffer
, "</pt-config>\n");
7268 /* Encode a raw buffer. */
7271 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7277 /* We use hex encoding - see common/rsp-low.h. */
7278 buffer_grow_str (buffer
, "<raw>\n");
7284 elem
[0] = tohex ((*data
>> 4) & 0xf);
7285 elem
[1] = tohex (*data
++ & 0xf);
7287 buffer_grow (buffer
, elem
, 2);
7290 buffer_grow_str (buffer
, "</raw>\n");
7293 /* See to_read_btrace target method. */
7296 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7297 enum btrace_read_type type
)
7299 struct btrace_data btrace
;
7300 struct btrace_block
*block
;
7301 enum btrace_error err
;
7304 btrace_data_init (&btrace
);
7306 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7307 if (err
!= BTRACE_ERR_NONE
)
7309 if (err
== BTRACE_ERR_OVERFLOW
)
7310 buffer_grow_str0 (buffer
, "E.Overflow.");
7312 buffer_grow_str0 (buffer
, "E.Generic Error.");
7317 switch (btrace
.format
)
7319 case BTRACE_FORMAT_NONE
:
7320 buffer_grow_str0 (buffer
, "E.No Trace.");
7323 case BTRACE_FORMAT_BTS
:
7324 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7325 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7328 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7330 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7331 paddress (block
->begin
), paddress (block
->end
));
7333 buffer_grow_str0 (buffer
, "</btrace>\n");
7336 case BTRACE_FORMAT_PT
:
7337 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7338 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7339 buffer_grow_str (buffer
, "<pt>\n");
7341 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7343 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7344 btrace
.variant
.pt
.size
);
7346 buffer_grow_str (buffer
, "</pt>\n");
7347 buffer_grow_str0 (buffer
, "</btrace>\n");
7351 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7355 btrace_data_fini (&btrace
);
7359 btrace_data_fini (&btrace
);
7363 /* See to_btrace_conf target method. */
7366 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7367 struct buffer
*buffer
)
7369 const struct btrace_config
*conf
;
7371 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7372 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7374 conf
= linux_btrace_conf (tinfo
);
7377 switch (conf
->format
)
7379 case BTRACE_FORMAT_NONE
:
7382 case BTRACE_FORMAT_BTS
:
7383 buffer_xml_printf (buffer
, "<bts");
7384 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7385 buffer_xml_printf (buffer
, " />\n");
7388 case BTRACE_FORMAT_PT
:
7389 buffer_xml_printf (buffer
, "<pt");
7390 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7391 buffer_xml_printf (buffer
, "/>\n");
7396 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7399 #endif /* HAVE_LINUX_BTRACE */
7401 /* See nat/linux-nat.h. */
7404 current_lwp_ptid (void)
7406 return ptid_of (current_thread
);
7409 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7412 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7414 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7415 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7417 return default_breakpoint_kind_from_pc (pcptr
);
7420 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7422 static const gdb_byte
*
7423 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7425 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7427 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7430 /* Implementation of the target_ops method
7431 "breakpoint_kind_from_current_state". */
7434 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7436 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7437 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7439 return linux_breakpoint_kind_from_pc (pcptr
);
7442 /* Default implementation of linux_target_ops method "set_pc" for
7443 32-bit pc register which is literally named "pc". */
7446 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7448 uint32_t newpc
= pc
;
7450 supply_register_by_name (regcache
, "pc", &newpc
);
7453 /* Default implementation of linux_target_ops method "get_pc" for
7454 32-bit pc register which is literally named "pc". */
7457 linux_get_pc_32bit (struct regcache
*regcache
)
7461 collect_register_by_name (regcache
, "pc", &pc
);
7463 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7467 /* Default implementation of linux_target_ops method "set_pc" for
7468 64-bit pc register which is literally named "pc". */
7471 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7473 uint64_t newpc
= pc
;
7475 supply_register_by_name (regcache
, "pc", &newpc
);
7478 /* Default implementation of linux_target_ops method "get_pc" for
7479 64-bit pc register which is literally named "pc". */
7482 linux_get_pc_64bit (struct regcache
*regcache
)
7486 collect_register_by_name (regcache
, "pc", &pc
);
7488 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7493 static struct target_ops linux_target_ops
= {
7494 linux_create_inferior
,
7495 linux_post_create_inferior
,
7504 linux_fetch_registers
,
7505 linux_store_registers
,
7506 linux_prepare_to_access_memory
,
7507 linux_done_accessing_memory
,
7510 linux_look_up_symbols
,
7511 linux_request_interrupt
,
7513 linux_supports_z_point_type
,
7516 linux_stopped_by_sw_breakpoint
,
7517 linux_supports_stopped_by_sw_breakpoint
,
7518 linux_stopped_by_hw_breakpoint
,
7519 linux_supports_stopped_by_hw_breakpoint
,
7520 linux_supports_hardware_single_step
,
7521 linux_stopped_by_watchpoint
,
7522 linux_stopped_data_address
,
7523 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7524 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7525 && defined(PT_TEXT_END_ADDR)
7530 #ifdef USE_THREAD_DB
7531 thread_db_get_tls_address
,
7536 hostio_last_error_from_errno
,
7539 linux_supports_non_stop
,
7541 linux_start_non_stop
,
7542 linux_supports_multi_process
,
7543 linux_supports_fork_events
,
7544 linux_supports_vfork_events
,
7545 linux_supports_exec_events
,
7546 linux_handle_new_gdb_connection
,
7547 #ifdef USE_THREAD_DB
7548 thread_db_handle_monitor_command
,
7552 linux_common_core_of_thread
,
7554 linux_process_qsupported
,
7555 linux_supports_tracepoints
,
7558 linux_thread_stopped
,
7562 linux_stabilize_threads
,
7563 linux_install_fast_tracepoint_jump_pad
,
7565 linux_supports_disable_randomization
,
7566 linux_get_min_fast_tracepoint_insn_len
,
7567 linux_qxfer_libraries_svr4
,
7568 linux_supports_agent
,
7569 #ifdef HAVE_LINUX_BTRACE
7570 linux_supports_btrace
,
7571 linux_enable_btrace
,
7572 linux_low_disable_btrace
,
7573 linux_low_read_btrace
,
7574 linux_low_btrace_conf
,
7582 linux_supports_range_stepping
,
7583 linux_proc_pid_to_exec_file
,
7584 linux_mntns_open_cloexec
,
7586 linux_mntns_readlink
,
7587 linux_breakpoint_kind_from_pc
,
7588 linux_sw_breakpoint_from_kind
,
7589 linux_proc_tid_get_name
,
7590 linux_breakpoint_kind_from_current_state
,
7591 linux_supports_software_single_step
,
7592 linux_supports_catch_syscall
,
7593 linux_get_ipa_tdesc_idx
,
7595 thread_db_thread_handle
,
7601 #ifdef HAVE_LINUX_REGSETS
7603 initialize_regsets_info (struct regsets_info
*info
)
7605 for (info
->num_regsets
= 0;
7606 info
->regsets
[info
->num_regsets
].size
>= 0;
7607 info
->num_regsets
++)
7613 initialize_low (void)
7615 struct sigaction sigchld_action
;
7617 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7618 set_target_ops (&linux_target_ops
);
7620 linux_ptrace_init_warnings ();
7622 sigchld_action
.sa_handler
= sigchld_handler
;
7623 sigemptyset (&sigchld_action
.sa_mask
);
7624 sigchld_action
.sa_flags
= SA_RESTART
;
7625 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7627 initialize_low_arch ();
7629 linux_check_ptrace_features ();