1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2018 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "linux-low.h"
21 #include "nat/linux-osdata.h"
25 #include "signals-state-save-restore.h"
26 #include "nat/linux-nat.h"
27 #include "nat/linux-waitpid.h"
29 #include "nat/gdb_ptrace.h"
30 #include "nat/linux-ptrace.h"
31 #include "nat/linux-procfs.h"
32 #include "nat/linux-personality.h"
34 #include <sys/ioctl.h>
37 #include <sys/syscall.h>
41 #include <sys/types.h>
46 #include "filestuff.h"
47 #include "tracepoint.h"
50 #include "common-inferior.h"
51 #include "nat/fork-inferior.h"
53 #include "common/scoped_restore.h"
55 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
56 then ELFMAG0 will have been defined. If it didn't get included by
57 gdb_proc_service.h then including it will likely introduce a duplicate
58 definition of elf_fpregset_t. */
61 #include "nat/linux-namespaces.h"
64 #define SPUFS_MAGIC 0x23c9b64e
67 #ifdef HAVE_PERSONALITY
68 # include <sys/personality.h>
69 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
70 # define ADDR_NO_RANDOMIZE 0x0040000
78 /* Some targets did not define these ptrace constants from the start,
79 so gdbserver defines them locally here. In the future, these may
80 be removed after they are added to asm/ptrace.h. */
81 #if !(defined(PT_TEXT_ADDR) \
82 || defined(PT_DATA_ADDR) \
83 || defined(PT_TEXT_END_ADDR))
84 #if defined(__mcoldfire__)
85 /* These are still undefined in 3.10 kernels. */
86 #define PT_TEXT_ADDR 49*4
87 #define PT_DATA_ADDR 50*4
88 #define PT_TEXT_END_ADDR 51*4
89 /* BFIN already defines these since at least 2.6.32 kernels. */
91 #define PT_TEXT_ADDR 220
92 #define PT_TEXT_END_ADDR 224
93 #define PT_DATA_ADDR 228
94 /* These are still undefined in 3.10 kernels. */
95 #elif defined(__TMS320C6X__)
96 #define PT_TEXT_ADDR (0x10000*4)
97 #define PT_DATA_ADDR (0x10004*4)
98 #define PT_TEXT_END_ADDR (0x10008*4)
102 #ifdef HAVE_LINUX_BTRACE
103 # include "nat/linux-btrace.h"
104 # include "btrace-common.h"
107 #ifndef HAVE_ELF32_AUXV_T
108 /* Copied from glibc's elf.h. */
111 uint32_t a_type
; /* Entry type */
114 uint32_t a_val
; /* Integer value */
115 /* We use to have pointer elements added here. We cannot do that,
116 though, since it does not work when using 32-bit definitions
117 on 64-bit platforms and vice versa. */
122 #ifndef HAVE_ELF64_AUXV_T
123 /* Copied from glibc's elf.h. */
126 uint64_t a_type
; /* Entry type */
129 uint64_t a_val
; /* Integer value */
130 /* We use to have pointer elements added here. We cannot do that,
131 though, since it does not work when using 32-bit definitions
132 on 64-bit platforms and vice versa. */
137 /* Does the current host support PTRACE_GETREGSET? */
138 int have_ptrace_getregset
= -1;
142 /* See nat/linux-nat.h. */
145 ptid_of_lwp (struct lwp_info
*lwp
)
147 return ptid_of (get_lwp_thread (lwp
));
150 /* See nat/linux-nat.h. */
153 lwp_set_arch_private_info (struct lwp_info
*lwp
,
154 struct arch_lwp_info
*info
)
156 lwp
->arch_private
= info
;
159 /* See nat/linux-nat.h. */
161 struct arch_lwp_info
*
162 lwp_arch_private_info (struct lwp_info
*lwp
)
164 return lwp
->arch_private
;
167 /* See nat/linux-nat.h. */
170 lwp_is_stopped (struct lwp_info
*lwp
)
175 /* See nat/linux-nat.h. */
177 enum target_stop_reason
178 lwp_stop_reason (struct lwp_info
*lwp
)
180 return lwp
->stop_reason
;
183 /* See nat/linux-nat.h. */
186 lwp_is_stepping (struct lwp_info
*lwp
)
188 return lwp
->stepping
;
191 /* A list of all unknown processes which receive stop signals. Some
192 other process will presumably claim each of these as forked
193 children momentarily. */
195 struct simple_pid_list
197 /* The process ID. */
200 /* The status as reported by waitpid. */
204 struct simple_pid_list
*next
;
206 struct simple_pid_list
*stopped_pids
;
208 /* Trivial list manipulation functions to keep track of a list of new
209 stopped processes. */
212 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
214 struct simple_pid_list
*new_pid
= XNEW (struct simple_pid_list
);
217 new_pid
->status
= status
;
218 new_pid
->next
= *listp
;
223 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
225 struct simple_pid_list
**p
;
227 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
228 if ((*p
)->pid
== pid
)
230 struct simple_pid_list
*next
= (*p
)->next
;
232 *statusp
= (*p
)->status
;
240 enum stopping_threads_kind
242 /* Not stopping threads presently. */
243 NOT_STOPPING_THREADS
,
245 /* Stopping threads. */
248 /* Stopping and suspending threads. */
249 STOPPING_AND_SUSPENDING_THREADS
252 /* This is set while stop_all_lwps is in effect. */
253 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
255 /* FIXME make into a target method? */
256 int using_threads
= 1;
258 /* True if we're presently stabilizing threads (moving them out of
260 static int stabilizing_threads
;
262 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
263 int step
, int signal
, siginfo_t
*info
);
264 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
265 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
266 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
267 static void unsuspend_all_lwps (struct lwp_info
*except
);
268 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
269 int *wstat
, int options
);
270 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
271 static struct lwp_info
*add_lwp (ptid_t ptid
);
272 static void linux_mourn (struct process_info
*process
);
273 static int linux_stopped_by_watchpoint (void);
274 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
275 static int lwp_is_marked_dead (struct lwp_info
*lwp
);
276 static void proceed_all_lwps (void);
277 static int finish_step_over (struct lwp_info
*lwp
);
278 static int kill_lwp (unsigned long lwpid
, int signo
);
279 static void enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
);
280 static void complete_ongoing_step_over (void);
281 static int linux_low_ptrace_options (int attached
);
282 static int check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
);
283 static void proceed_one_lwp (thread_info
*thread
, lwp_info
*except
);
285 /* When the event-loop is doing a step-over, this points at the thread
287 ptid_t step_over_bkpt
;
289 /* True if the low target can hardware single-step. */
292 can_hardware_single_step (void)
294 if (the_low_target
.supports_hardware_single_step
!= NULL
)
295 return the_low_target
.supports_hardware_single_step ();
300 /* True if the low target can software single-step. Such targets
301 implement the GET_NEXT_PCS callback. */
304 can_software_single_step (void)
306 return (the_low_target
.get_next_pcs
!= NULL
);
309 /* True if the low target supports memory breakpoints. If so, we'll
310 have a GET_PC implementation. */
313 supports_breakpoints (void)
315 return (the_low_target
.get_pc
!= NULL
);
318 /* Returns true if this target can support fast tracepoints. This
319 does not mean that the in-process agent has been loaded in the
323 supports_fast_tracepoints (void)
325 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
328 /* True if LWP is stopped in its stepping range. */
331 lwp_in_step_range (struct lwp_info
*lwp
)
333 CORE_ADDR pc
= lwp
->stop_pc
;
335 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
338 struct pending_signals
342 struct pending_signals
*prev
;
345 /* The read/write ends of the pipe registered as waitable file in the
347 static int linux_event_pipe
[2] = { -1, -1 };
349 /* True if we're currently in async mode. */
350 #define target_is_async_p() (linux_event_pipe[0] != -1)
352 static void send_sigstop (struct lwp_info
*lwp
);
353 static void wait_for_sigstop (void);
355 /* Return non-zero if HEADER is a 64-bit ELF file. */
358 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
360 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
361 && header
->e_ident
[EI_MAG1
] == ELFMAG1
362 && header
->e_ident
[EI_MAG2
] == ELFMAG2
363 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
365 *machine
= header
->e_machine
;
366 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
373 /* Return non-zero if FILE is a 64-bit ELF file,
374 zero if the file is not a 64-bit ELF file,
375 and -1 if the file is not accessible or doesn't exist. */
378 elf_64_file_p (const char *file
, unsigned int *machine
)
383 fd
= open (file
, O_RDONLY
);
387 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
394 return elf_64_header_p (&header
, machine
);
397 /* Accepts an integer PID; Returns true if the executable PID is
398 running is a 64-bit ELF file.. */
401 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
405 sprintf (file
, "/proc/%d/exe", pid
);
406 return elf_64_file_p (file
, machine
);
410 delete_lwp (struct lwp_info
*lwp
)
412 struct thread_info
*thr
= get_lwp_thread (lwp
);
415 debug_printf ("deleting %ld\n", lwpid_of (thr
));
419 if (the_low_target
.delete_thread
!= NULL
)
420 the_low_target
.delete_thread (lwp
->arch_private
);
422 gdb_assert (lwp
->arch_private
== NULL
);
427 /* Add a process to the common process list, and set its private
430 static struct process_info
*
431 linux_add_process (int pid
, int attached
)
433 struct process_info
*proc
;
435 proc
= add_process (pid
, attached
);
436 proc
->priv
= XCNEW (struct process_info_private
);
438 if (the_low_target
.new_process
!= NULL
)
439 proc
->priv
->arch_private
= the_low_target
.new_process ();
444 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
446 /* Call the target arch_setup function on the current thread. */
449 linux_arch_setup (void)
451 the_low_target
.arch_setup ();
454 /* Call the target arch_setup function on THREAD. */
457 linux_arch_setup_thread (struct thread_info
*thread
)
459 struct thread_info
*saved_thread
;
461 saved_thread
= current_thread
;
462 current_thread
= thread
;
466 current_thread
= saved_thread
;
469 /* Handle a GNU/Linux extended wait response. If we see a clone,
470 fork, or vfork event, we need to add the new LWP to our list
471 (and return 0 so as not to report the trap to higher layers).
472 If we see an exec event, we will modify ORIG_EVENT_LWP to point
473 to a new LWP representing the new program. */
476 handle_extended_wait (struct lwp_info
**orig_event_lwp
, int wstat
)
478 struct lwp_info
*event_lwp
= *orig_event_lwp
;
479 int event
= linux_ptrace_get_extended_event (wstat
);
480 struct thread_info
*event_thr
= get_lwp_thread (event_lwp
);
481 struct lwp_info
*new_lwp
;
483 gdb_assert (event_lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
485 /* All extended events we currently use are mid-syscall. Only
486 PTRACE_EVENT_STOP is delivered more like a signal-stop, but
487 you have to be using PTRACE_SEIZE to get that. */
488 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
490 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
491 || (event
== PTRACE_EVENT_CLONE
))
494 unsigned long new_pid
;
497 /* Get the pid of the new lwp. */
498 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
501 /* If we haven't already seen the new PID stop, wait for it now. */
502 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
504 /* The new child has a pending SIGSTOP. We can't affect it until it
505 hits the SIGSTOP, but we're already attached. */
507 ret
= my_waitpid (new_pid
, &status
, __WALL
);
510 perror_with_name ("waiting for new child");
511 else if (ret
!= new_pid
)
512 warning ("wait returned unexpected PID %d", ret
);
513 else if (!WIFSTOPPED (status
))
514 warning ("wait returned unexpected status 0x%x", status
);
517 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
519 struct process_info
*parent_proc
;
520 struct process_info
*child_proc
;
521 struct lwp_info
*child_lwp
;
522 struct thread_info
*child_thr
;
523 struct target_desc
*tdesc
;
525 ptid
= ptid_build (new_pid
, new_pid
, 0);
529 debug_printf ("HEW: Got fork event from LWP %ld, "
531 ptid_get_lwp (ptid_of (event_thr
)),
532 ptid_get_pid (ptid
));
535 /* Add the new process to the tables and clone the breakpoint
536 lists of the parent. We need to do this even if the new process
537 will be detached, since we will need the process object and the
538 breakpoints to remove any breakpoints from memory when we
539 detach, and the client side will access registers. */
540 child_proc
= linux_add_process (new_pid
, 0);
541 gdb_assert (child_proc
!= NULL
);
542 child_lwp
= add_lwp (ptid
);
543 gdb_assert (child_lwp
!= NULL
);
544 child_lwp
->stopped
= 1;
545 child_lwp
->must_set_ptrace_flags
= 1;
546 child_lwp
->status_pending_p
= 0;
547 child_thr
= get_lwp_thread (child_lwp
);
548 child_thr
->last_resume_kind
= resume_stop
;
549 child_thr
->last_status
.kind
= TARGET_WAITKIND_STOPPED
;
551 /* If we're suspending all threads, leave this one suspended
552 too. If the fork/clone parent is stepping over a breakpoint,
553 all other threads have been suspended already. Leave the
554 child suspended too. */
555 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
556 || event_lwp
->bp_reinsert
!= 0)
559 debug_printf ("HEW: leaving child suspended\n");
560 child_lwp
->suspended
= 1;
563 parent_proc
= get_thread_process (event_thr
);
564 child_proc
->attached
= parent_proc
->attached
;
566 if (event_lwp
->bp_reinsert
!= 0
567 && can_software_single_step ()
568 && event
== PTRACE_EVENT_VFORK
)
570 /* If we leave single-step breakpoints there, child will
571 hit it, so uninsert single-step breakpoints from parent
572 (and child). Once vfork child is done, reinsert
573 them back to parent. */
574 uninsert_single_step_breakpoints (event_thr
);
577 clone_all_breakpoints (child_thr
, event_thr
);
579 tdesc
= allocate_target_description ();
580 copy_target_description (tdesc
, parent_proc
->tdesc
);
581 child_proc
->tdesc
= tdesc
;
583 /* Clone arch-specific process data. */
584 if (the_low_target
.new_fork
!= NULL
)
585 the_low_target
.new_fork (parent_proc
, child_proc
);
587 /* Save fork info in the parent thread. */
588 if (event
== PTRACE_EVENT_FORK
)
589 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
590 else if (event
== PTRACE_EVENT_VFORK
)
591 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
593 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
595 /* The status_pending field contains bits denoting the
596 extended event, so when the pending event is handled,
597 the handler will look at lwp->waitstatus. */
598 event_lwp
->status_pending_p
= 1;
599 event_lwp
->status_pending
= wstat
;
601 /* Link the threads until the parent event is passed on to
603 event_lwp
->fork_relative
= child_lwp
;
604 child_lwp
->fork_relative
= event_lwp
;
606 /* If the parent thread is doing step-over with single-step
607 breakpoints, the list of single-step breakpoints are cloned
608 from the parent's. Remove them from the child process.
609 In case of vfork, we'll reinsert them back once vforked
611 if (event_lwp
->bp_reinsert
!= 0
612 && can_software_single_step ())
614 /* The child process is forked and stopped, so it is safe
615 to access its memory without stopping all other threads
616 from other processes. */
617 delete_single_step_breakpoints (child_thr
);
619 gdb_assert (has_single_step_breakpoints (event_thr
));
620 gdb_assert (!has_single_step_breakpoints (child_thr
));
623 /* Report the event. */
628 debug_printf ("HEW: Got clone event "
629 "from LWP %ld, new child is LWP %ld\n",
630 lwpid_of (event_thr
), new_pid
);
632 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
633 new_lwp
= add_lwp (ptid
);
635 /* Either we're going to immediately resume the new thread
636 or leave it stopped. linux_resume_one_lwp is a nop if it
637 thinks the thread is currently running, so set this first
638 before calling linux_resume_one_lwp. */
639 new_lwp
->stopped
= 1;
641 /* If we're suspending all threads, leave this one suspended
642 too. If the fork/clone parent is stepping over a breakpoint,
643 all other threads have been suspended already. Leave the
644 child suspended too. */
645 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
646 || event_lwp
->bp_reinsert
!= 0)
647 new_lwp
->suspended
= 1;
649 /* Normally we will get the pending SIGSTOP. But in some cases
650 we might get another signal delivered to the group first.
651 If we do get another signal, be sure not to lose it. */
652 if (WSTOPSIG (status
) != SIGSTOP
)
654 new_lwp
->stop_expected
= 1;
655 new_lwp
->status_pending_p
= 1;
656 new_lwp
->status_pending
= status
;
658 else if (report_thread_events
)
660 new_lwp
->waitstatus
.kind
= TARGET_WAITKIND_THREAD_CREATED
;
661 new_lwp
->status_pending_p
= 1;
662 new_lwp
->status_pending
= status
;
666 thread_db_notice_clone (event_thr
, ptid
);
669 /* Don't report the event. */
672 else if (event
== PTRACE_EVENT_VFORK_DONE
)
674 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
676 if (event_lwp
->bp_reinsert
!= 0 && can_software_single_step ())
678 reinsert_single_step_breakpoints (event_thr
);
680 gdb_assert (has_single_step_breakpoints (event_thr
));
683 /* Report the event. */
686 else if (event
== PTRACE_EVENT_EXEC
&& report_exec_events
)
688 struct process_info
*proc
;
689 std::vector
<int> syscalls_to_catch
;
695 debug_printf ("HEW: Got exec event from LWP %ld\n",
696 lwpid_of (event_thr
));
699 /* Get the event ptid. */
700 event_ptid
= ptid_of (event_thr
);
701 event_pid
= ptid_get_pid (event_ptid
);
703 /* Save the syscall list from the execing process. */
704 proc
= get_thread_process (event_thr
);
705 syscalls_to_catch
= std::move (proc
->syscalls_to_catch
);
707 /* Delete the execing process and all its threads. */
709 current_thread
= NULL
;
711 /* Create a new process/lwp/thread. */
712 proc
= linux_add_process (event_pid
, 0);
713 event_lwp
= add_lwp (event_ptid
);
714 event_thr
= get_lwp_thread (event_lwp
);
715 gdb_assert (current_thread
== event_thr
);
716 linux_arch_setup_thread (event_thr
);
718 /* Set the event status. */
719 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
720 event_lwp
->waitstatus
.value
.execd_pathname
721 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
723 /* Mark the exec status as pending. */
724 event_lwp
->stopped
= 1;
725 event_lwp
->status_pending_p
= 1;
726 event_lwp
->status_pending
= wstat
;
727 event_thr
->last_resume_kind
= resume_continue
;
728 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
730 /* Update syscall state in the new lwp, effectively mid-syscall too. */
731 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
733 /* Restore the list to catch. Don't rely on the client, which is free
734 to avoid sending a new list when the architecture doesn't change.
735 Also, for ANY_SYSCALL, the architecture doesn't really matter. */
736 proc
->syscalls_to_catch
= std::move (syscalls_to_catch
);
738 /* Report the event. */
739 *orig_event_lwp
= event_lwp
;
743 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
746 /* Return the PC as read from the regcache of LWP, without any
750 get_pc (struct lwp_info
*lwp
)
752 struct thread_info
*saved_thread
;
753 struct regcache
*regcache
;
756 if (the_low_target
.get_pc
== NULL
)
759 saved_thread
= current_thread
;
760 current_thread
= get_lwp_thread (lwp
);
762 regcache
= get_thread_regcache (current_thread
, 1);
763 pc
= (*the_low_target
.get_pc
) (regcache
);
766 debug_printf ("pc is 0x%lx\n", (long) pc
);
768 current_thread
= saved_thread
;
772 /* This function should only be called if LWP got a SYSCALL_SIGTRAP.
773 Fill *SYSNO with the syscall nr trapped. */
776 get_syscall_trapinfo (struct lwp_info
*lwp
, int *sysno
)
778 struct thread_info
*saved_thread
;
779 struct regcache
*regcache
;
781 if (the_low_target
.get_syscall_trapinfo
== NULL
)
783 /* If we cannot get the syscall trapinfo, report an unknown
784 system call number. */
785 *sysno
= UNKNOWN_SYSCALL
;
789 saved_thread
= current_thread
;
790 current_thread
= get_lwp_thread (lwp
);
792 regcache
= get_thread_regcache (current_thread
, 1);
793 (*the_low_target
.get_syscall_trapinfo
) (regcache
, sysno
);
796 debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno
);
798 current_thread
= saved_thread
;
801 static int check_stopped_by_watchpoint (struct lwp_info
*child
);
803 /* Called when the LWP stopped for a signal/trap. If it stopped for a
804 trap check what caused it (breakpoint, watchpoint, trace, etc.),
805 and save the result in the LWP's stop_reason field. If it stopped
806 for a breakpoint, decrement the PC if necessary on the lwp's
807 architecture. Returns true if we now have the LWP's stop PC. */
810 save_stop_reason (struct lwp_info
*lwp
)
813 CORE_ADDR sw_breakpoint_pc
;
814 struct thread_info
*saved_thread
;
815 #if USE_SIGTRAP_SIGINFO
819 if (the_low_target
.get_pc
== NULL
)
823 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
825 /* breakpoint_at reads from the current thread. */
826 saved_thread
= current_thread
;
827 current_thread
= get_lwp_thread (lwp
);
829 #if USE_SIGTRAP_SIGINFO
830 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
831 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
833 if (siginfo
.si_signo
== SIGTRAP
)
835 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
)
836 && GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
838 /* The si_code is ambiguous on this arch -- check debug
840 if (!check_stopped_by_watchpoint (lwp
))
841 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
843 else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
845 /* If we determine the LWP stopped for a SW breakpoint,
846 trust it. Particularly don't check watchpoint
847 registers, because at least on s390, we'd find
848 stopped-by-watchpoint as long as there's a watchpoint
850 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
852 else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
854 /* This can indicate either a hardware breakpoint or
855 hardware watchpoint. Check debug registers. */
856 if (!check_stopped_by_watchpoint (lwp
))
857 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
859 else if (siginfo
.si_code
== TRAP_TRACE
)
861 /* We may have single stepped an instruction that
862 triggered a watchpoint. In that case, on some
863 architectures (such as x86), instead of TRAP_HWBKPT,
864 si_code indicates TRAP_TRACE, and we need to check
865 the debug registers separately. */
866 if (!check_stopped_by_watchpoint (lwp
))
867 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
872 /* We may have just stepped a breakpoint instruction. E.g., in
873 non-stop mode, GDB first tells the thread A to step a range, and
874 then the user inserts a breakpoint inside the range. In that
875 case we need to report the breakpoint PC. */
876 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
877 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
878 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
880 if (hardware_breakpoint_inserted_here (pc
))
881 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
883 if (lwp
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
)
884 check_stopped_by_watchpoint (lwp
);
887 if (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
891 struct thread_info
*thr
= get_lwp_thread (lwp
);
893 debug_printf ("CSBB: %s stopped by software breakpoint\n",
894 target_pid_to_str (ptid_of (thr
)));
897 /* Back up the PC if necessary. */
898 if (pc
!= sw_breakpoint_pc
)
900 struct regcache
*regcache
901 = get_thread_regcache (current_thread
, 1);
902 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
905 /* Update this so we record the correct stop PC below. */
906 pc
= sw_breakpoint_pc
;
908 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
)
912 struct thread_info
*thr
= get_lwp_thread (lwp
);
914 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
915 target_pid_to_str (ptid_of (thr
)));
918 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
922 struct thread_info
*thr
= get_lwp_thread (lwp
);
924 debug_printf ("CSBB: %s stopped by hardware watchpoint\n",
925 target_pid_to_str (ptid_of (thr
)));
928 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
)
932 struct thread_info
*thr
= get_lwp_thread (lwp
);
934 debug_printf ("CSBB: %s stopped by trace\n",
935 target_pid_to_str (ptid_of (thr
)));
940 current_thread
= saved_thread
;
944 static struct lwp_info
*
945 add_lwp (ptid_t ptid
)
947 struct lwp_info
*lwp
;
949 lwp
= XCNEW (struct lwp_info
);
951 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
953 if (the_low_target
.new_thread
!= NULL
)
954 the_low_target
.new_thread (lwp
);
956 lwp
->thread
= add_thread (ptid
, lwp
);
961 /* Callback to be used when calling fork_inferior, responsible for
962 actually initiating the tracing of the inferior. */
967 if (ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0,
968 (PTRACE_TYPE_ARG4
) 0) < 0)
969 trace_start_error_with_name ("ptrace");
971 if (setpgid (0, 0) < 0)
972 trace_start_error_with_name ("setpgid");
974 /* If GDBserver is connected to gdb via stdio, redirect the inferior's
975 stdout to stderr so that inferior i/o doesn't corrupt the connection.
976 Also, redirect stdin to /dev/null. */
977 if (remote_connection_is_stdio ())
980 trace_start_error_with_name ("close");
981 if (open ("/dev/null", O_RDONLY
) < 0)
982 trace_start_error_with_name ("open");
984 trace_start_error_with_name ("dup2");
985 if (write (2, "stdin/stdout redirected\n",
986 sizeof ("stdin/stdout redirected\n") - 1) < 0)
988 /* Errors ignored. */;
993 /* Start an inferior process and returns its pid.
994 PROGRAM is the name of the program to be started, and PROGRAM_ARGS
995 are its arguments. */
998 linux_create_inferior (const char *program
,
999 const std::vector
<char *> &program_args
)
1001 struct lwp_info
*new_lwp
;
1006 maybe_disable_address_space_randomization restore_personality
1007 (disable_randomization
);
1008 std::string str_program_args
= stringify_argv (program_args
);
1010 pid
= fork_inferior (program
,
1011 str_program_args
.c_str (),
1012 get_environ ()->envp (), linux_ptrace_fun
,
1013 NULL
, NULL
, NULL
, NULL
);
1016 linux_add_process (pid
, 0);
1018 ptid
= ptid_build (pid
, pid
, 0);
1019 new_lwp
= add_lwp (ptid
);
1020 new_lwp
->must_set_ptrace_flags
= 1;
1022 post_fork_inferior (pid
, program
);
1027 /* Implement the post_create_inferior target_ops method. */
1030 linux_post_create_inferior (void)
1032 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
1034 linux_arch_setup ();
1036 if (lwp
->must_set_ptrace_flags
)
1038 struct process_info
*proc
= current_process ();
1039 int options
= linux_low_ptrace_options (proc
->attached
);
1041 linux_enable_event_reporting (lwpid_of (current_thread
), options
);
1042 lwp
->must_set_ptrace_flags
= 0;
1046 /* Attach to an inferior process. Returns 0 on success, ERRNO on
1050 linux_attach_lwp (ptid_t ptid
)
1052 struct lwp_info
*new_lwp
;
1053 int lwpid
= ptid_get_lwp (ptid
);
1055 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
1059 new_lwp
= add_lwp (ptid
);
1061 /* We need to wait for SIGSTOP before being able to make the next
1062 ptrace call on this LWP. */
1063 new_lwp
->must_set_ptrace_flags
= 1;
1065 if (linux_proc_pid_is_stopped (lwpid
))
1068 debug_printf ("Attached to a stopped process\n");
1070 /* The process is definitely stopped. It is in a job control
1071 stop, unless the kernel predates the TASK_STOPPED /
1072 TASK_TRACED distinction, in which case it might be in a
1073 ptrace stop. Make sure it is in a ptrace stop; from there we
1074 can kill it, signal it, et cetera.
1076 First make sure there is a pending SIGSTOP. Since we are
1077 already attached, the process can not transition from stopped
1078 to running without a PTRACE_CONT; so we know this signal will
1079 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1080 probably already in the queue (unless this kernel is old
1081 enough to use TASK_STOPPED for ptrace stops); but since
1082 SIGSTOP is not an RT signal, it can only be queued once. */
1083 kill_lwp (lwpid
, SIGSTOP
);
1085 /* Finally, resume the stopped process. This will deliver the
1086 SIGSTOP (or a higher priority signal, just like normal
1087 PTRACE_ATTACH), which we'll catch later on. */
1088 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1091 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
1092 brings it to a halt.
1094 There are several cases to consider here:
1096 1) gdbserver has already attached to the process and is being notified
1097 of a new thread that is being created.
1098 In this case we should ignore that SIGSTOP and resume the
1099 process. This is handled below by setting stop_expected = 1,
1100 and the fact that add_thread sets last_resume_kind ==
1103 2) This is the first thread (the process thread), and we're attaching
1104 to it via attach_inferior.
1105 In this case we want the process thread to stop.
1106 This is handled by having linux_attach set last_resume_kind ==
1107 resume_stop after we return.
1109 If the pid we are attaching to is also the tgid, we attach to and
1110 stop all the existing threads. Otherwise, we attach to pid and
1111 ignore any other threads in the same group as this pid.
1113 3) GDB is connecting to gdbserver and is requesting an enumeration of all
1115 In this case we want the thread to stop.
1116 FIXME: This case is currently not properly handled.
1117 We should wait for the SIGSTOP but don't. Things work apparently
1118 because enough time passes between when we ptrace (ATTACH) and when
1119 gdb makes the next ptrace call on the thread.
1121 On the other hand, if we are currently trying to stop all threads, we
1122 should treat the new thread as if we had sent it a SIGSTOP. This works
1123 because we are guaranteed that the add_lwp call above added us to the
1124 end of the list, and so the new thread has not yet reached
1125 wait_for_sigstop (but will). */
1126 new_lwp
->stop_expected
= 1;
1131 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
1132 already attached. Returns true if a new LWP is found, false
1136 attach_proc_task_lwp_callback (ptid_t ptid
)
1138 /* Is this a new thread? */
1139 if (find_thread_ptid (ptid
) == NULL
)
1141 int lwpid
= ptid_get_lwp (ptid
);
1145 debug_printf ("Found new lwp %d\n", lwpid
);
1147 err
= linux_attach_lwp (ptid
);
1149 /* Be quiet if we simply raced with the thread exiting. EPERM
1150 is returned if the thread's task still exists, and is marked
1151 as exited or zombie, as well as other conditions, so in that
1152 case, confirm the status in /proc/PID/status. */
1154 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1158 debug_printf ("Cannot attach to lwp %d: "
1159 "thread is gone (%d: %s)\n",
1160 lwpid
, err
, strerror (err
));
1166 = linux_ptrace_attach_fail_reason_string (ptid
, err
);
1168 warning (_("Cannot attach to lwp %d: %s"), lwpid
, reason
.c_str ());
1176 static void async_file_mark (void);
1178 /* Attach to PID. If PID is the tgid, attach to it and all
1182 linux_attach (unsigned long pid
)
1184 struct process_info
*proc
;
1185 struct thread_info
*initial_thread
;
1186 ptid_t ptid
= ptid_build (pid
, pid
, 0);
1189 /* Attach to PID. We will check for other threads
1191 err
= linux_attach_lwp (ptid
);
1194 std::string reason
= linux_ptrace_attach_fail_reason_string (ptid
, err
);
1196 error ("Cannot attach to process %ld: %s", pid
, reason
.c_str ());
1199 proc
= linux_add_process (pid
, 1);
1201 /* Don't ignore the initial SIGSTOP if we just attached to this
1202 process. It will be collected by wait shortly. */
1203 initial_thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
1204 initial_thread
->last_resume_kind
= resume_stop
;
1206 /* We must attach to every LWP. If /proc is mounted, use that to
1207 find them now. On the one hand, the inferior may be using raw
1208 clone instead of using pthreads. On the other hand, even if it
1209 is using pthreads, GDB may not be connected yet (thread_db needs
1210 to do symbol lookups, through qSymbol). Also, thread_db walks
1211 structures in the inferior's address space to find the list of
1212 threads/LWPs, and those structures may well be corrupted. Note
1213 that once thread_db is loaded, we'll still use it to list threads
1214 and associate pthread info with each LWP. */
1215 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1217 /* GDB will shortly read the xml target description for this
1218 process, to figure out the process' architecture. But the target
1219 description is only filled in when the first process/thread in
1220 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1221 that now, otherwise, if GDB is fast enough, it could read the
1222 target description _before_ that initial stop. */
1225 struct lwp_info
*lwp
;
1227 ptid_t pid_ptid
= pid_to_ptid (pid
);
1229 lwpid
= linux_wait_for_event_filtered (pid_ptid
, pid_ptid
,
1231 gdb_assert (lwpid
> 0);
1233 lwp
= find_lwp_pid (pid_to_ptid (lwpid
));
1235 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGSTOP
)
1237 lwp
->status_pending_p
= 1;
1238 lwp
->status_pending
= wstat
;
1241 initial_thread
->last_resume_kind
= resume_continue
;
1245 gdb_assert (proc
->tdesc
!= NULL
);
1252 last_thread_of_process_p (int pid
)
1254 bool seen_one
= false;
1256 thread_info
*thread
= find_thread (pid
, [&] (thread_info
*thread
)
1260 /* This is the first thread of this process we see. */
1266 /* This is the second thread of this process we see. */
1271 return thread
== NULL
;
1277 linux_kill_one_lwp (struct lwp_info
*lwp
)
1279 struct thread_info
*thr
= get_lwp_thread (lwp
);
1280 int pid
= lwpid_of (thr
);
1282 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1283 there is no signal context, and ptrace(PTRACE_KILL) (or
1284 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1285 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1286 alternative is to kill with SIGKILL. We only need one SIGKILL
1287 per process, not one for each thread. But since we still support
1288 support debugging programs using raw clone without CLONE_THREAD,
1289 we send one for each thread. For years, we used PTRACE_KILL
1290 only, so we're being a bit paranoid about some old kernels where
1291 PTRACE_KILL might work better (dubious if there are any such, but
1292 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1293 second, and so we're fine everywhere. */
1296 kill_lwp (pid
, SIGKILL
);
1299 int save_errno
= errno
;
1301 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1302 target_pid_to_str (ptid_of (thr
)),
1303 save_errno
? strerror (save_errno
) : "OK");
1307 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1310 int save_errno
= errno
;
1312 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1313 target_pid_to_str (ptid_of (thr
)),
1314 save_errno
? strerror (save_errno
) : "OK");
1318 /* Kill LWP and wait for it to die. */
1321 kill_wait_lwp (struct lwp_info
*lwp
)
1323 struct thread_info
*thr
= get_lwp_thread (lwp
);
1324 int pid
= ptid_get_pid (ptid_of (thr
));
1325 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1330 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1334 linux_kill_one_lwp (lwp
);
1336 /* Make sure it died. Notes:
1338 - The loop is most likely unnecessary.
1340 - We don't use linux_wait_for_event as that could delete lwps
1341 while we're iterating over them. We're not interested in
1342 any pending status at this point, only in making sure all
1343 wait status on the kernel side are collected until the
1346 - We don't use __WALL here as the __WALL emulation relies on
1347 SIGCHLD, and killing a stopped process doesn't generate
1348 one, nor an exit status.
1350 res
= my_waitpid (lwpid
, &wstat
, 0);
1351 if (res
== -1 && errno
== ECHILD
)
1352 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1353 } while (res
> 0 && WIFSTOPPED (wstat
));
1355 /* Even if it was stopped, the child may have already disappeared.
1356 E.g., if it was killed by SIGKILL. */
1357 if (res
< 0 && errno
!= ECHILD
)
1358 perror_with_name ("kill_wait_lwp");
1361 /* Callback for `for_each_thread'. Kills an lwp of a given process,
1362 except the leader. */
1365 kill_one_lwp_callback (thread_info
*thread
, int pid
)
1367 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1369 /* We avoid killing the first thread here, because of a Linux kernel (at
1370 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1371 the children get a chance to be reaped, it will remain a zombie
1374 if (lwpid_of (thread
) == pid
)
1377 debug_printf ("lkop: is last of process %s\n",
1378 target_pid_to_str (thread
->id
));
1382 kill_wait_lwp (lwp
);
1386 linux_kill (int pid
)
1388 struct process_info
*process
;
1389 struct lwp_info
*lwp
;
1391 process
= find_process_pid (pid
);
1392 if (process
== NULL
)
1395 /* If we're killing a running inferior, make sure it is stopped
1396 first, as PTRACE_KILL will not work otherwise. */
1397 stop_all_lwps (0, NULL
);
1399 for_each_thread (pid
, [&] (thread_info
*thread
)
1401 kill_one_lwp_callback (thread
, pid
);
1404 /* See the comment in linux_kill_one_lwp. We did not kill the first
1405 thread in the list, so do so now. */
1406 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1411 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1415 kill_wait_lwp (lwp
);
1417 the_target
->mourn (process
);
1419 /* Since we presently can only stop all lwps of all processes, we
1420 need to unstop lwps of other processes. */
1421 unstop_all_lwps (0, NULL
);
1425 /* Get pending signal of THREAD, for detaching purposes. This is the
1426 signal the thread last stopped for, which we need to deliver to the
1427 thread when detaching, otherwise, it'd be suppressed/lost. */
1430 get_detach_signal (struct thread_info
*thread
)
1432 enum gdb_signal signo
= GDB_SIGNAL_0
;
1434 struct lwp_info
*lp
= get_thread_lwp (thread
);
1436 if (lp
->status_pending_p
)
1437 status
= lp
->status_pending
;
1440 /* If the thread had been suspended by gdbserver, and it stopped
1441 cleanly, then it'll have stopped with SIGSTOP. But we don't
1442 want to deliver that SIGSTOP. */
1443 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1444 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1447 /* Otherwise, we may need to deliver the signal we
1449 status
= lp
->last_status
;
1452 if (!WIFSTOPPED (status
))
1455 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1456 target_pid_to_str (ptid_of (thread
)));
1460 /* Extended wait statuses aren't real SIGTRAPs. */
1461 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1464 debug_printf ("GPS: lwp %s had stopped with extended "
1465 "status: no pending signal\n",
1466 target_pid_to_str (ptid_of (thread
)));
1470 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1472 if (program_signals_p
&& !program_signals
[signo
])
1475 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1476 target_pid_to_str (ptid_of (thread
)),
1477 gdb_signal_to_string (signo
));
1480 else if (!program_signals_p
1481 /* If we have no way to know which signals GDB does not
1482 want to have passed to the program, assume
1483 SIGTRAP/SIGINT, which is GDB's default. */
1484 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1487 debug_printf ("GPS: lwp %s had signal %s, "
1488 "but we don't know if we should pass it. "
1489 "Default to not.\n",
1490 target_pid_to_str (ptid_of (thread
)),
1491 gdb_signal_to_string (signo
));
1497 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1498 target_pid_to_str (ptid_of (thread
)),
1499 gdb_signal_to_string (signo
));
1501 return WSTOPSIG (status
);
1505 /* Detach from LWP. */
1508 linux_detach_one_lwp (struct lwp_info
*lwp
)
1510 struct thread_info
*thread
= get_lwp_thread (lwp
);
1514 /* If there is a pending SIGSTOP, get rid of it. */
1515 if (lwp
->stop_expected
)
1518 debug_printf ("Sending SIGCONT to %s\n",
1519 target_pid_to_str (ptid_of (thread
)));
1521 kill_lwp (lwpid_of (thread
), SIGCONT
);
1522 lwp
->stop_expected
= 0;
1525 /* Pass on any pending signal for this thread. */
1526 sig
= get_detach_signal (thread
);
1528 /* Preparing to resume may try to write registers, and fail if the
1529 lwp is zombie. If that happens, ignore the error. We'll handle
1530 it below, when detach fails with ESRCH. */
1533 /* Flush any pending changes to the process's registers. */
1534 regcache_invalidate_thread (thread
);
1536 /* Finally, let it resume. */
1537 if (the_low_target
.prepare_to_resume
!= NULL
)
1538 the_low_target
.prepare_to_resume (lwp
);
1540 CATCH (ex
, RETURN_MASK_ERROR
)
1542 if (!check_ptrace_stopped_lwp_gone (lwp
))
1543 throw_exception (ex
);
1547 lwpid
= lwpid_of (thread
);
1548 if (ptrace (PTRACE_DETACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0,
1549 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1551 int save_errno
= errno
;
1553 /* We know the thread exists, so ESRCH must mean the lwp is
1554 zombie. This can happen if one of the already-detached
1555 threads exits the whole thread group. In that case we're
1556 still attached, and must reap the lwp. */
1557 if (save_errno
== ESRCH
)
1561 ret
= my_waitpid (lwpid
, &status
, __WALL
);
1564 warning (_("Couldn't reap LWP %d while detaching: %s"),
1565 lwpid
, strerror (errno
));
1567 else if (!WIFEXITED (status
) && !WIFSIGNALED (status
))
1569 warning (_("Reaping LWP %d while detaching "
1570 "returned unexpected status 0x%x"),
1576 error (_("Can't detach %s: %s"),
1577 target_pid_to_str (ptid_of (thread
)),
1578 strerror (save_errno
));
1581 else if (debug_threads
)
1583 debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n",
1584 target_pid_to_str (ptid_of (thread
)),
1591 /* Callback for for_each_thread. Detaches from non-leader threads of a
1595 linux_detach_lwp_callback (thread_info
*thread
)
1597 /* We don't actually detach from the thread group leader just yet.
1598 If the thread group exits, we must reap the zombie clone lwps
1599 before we're able to reap the leader. */
1600 if (thread
->id
.pid () == thread
->id
.lwp ())
1603 lwp_info
*lwp
= get_thread_lwp (thread
);
1604 linux_detach_one_lwp (lwp
);
1608 linux_detach (int pid
)
1610 struct process_info
*process
;
1611 struct lwp_info
*main_lwp
;
1613 process
= find_process_pid (pid
);
1614 if (process
== NULL
)
1617 /* As there's a step over already in progress, let it finish first,
1618 otherwise nesting a stabilize_threads operation on top gets real
1620 complete_ongoing_step_over ();
1622 /* Stop all threads before detaching. First, ptrace requires that
1623 the thread is stopped to sucessfully detach. Second, thread_db
1624 may need to uninstall thread event breakpoints from memory, which
1625 only works with a stopped process anyway. */
1626 stop_all_lwps (0, NULL
);
1628 #ifdef USE_THREAD_DB
1629 thread_db_detach (process
);
1632 /* Stabilize threads (move out of jump pads). */
1633 stabilize_threads ();
1635 /* Detach from the clone lwps first. If the thread group exits just
1636 while we're detaching, we must reap the clone lwps before we're
1637 able to reap the leader. */
1638 for_each_thread (pid
, linux_detach_lwp_callback
);
1640 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1641 linux_detach_one_lwp (main_lwp
);
1643 the_target
->mourn (process
);
1645 /* Since we presently can only stop all lwps of all processes, we
1646 need to unstop lwps of other processes. */
1647 unstop_all_lwps (0, NULL
);
1651 /* Remove all LWPs that belong to process PROC from the lwp list. */
1654 linux_mourn (struct process_info
*process
)
1656 struct process_info_private
*priv
;
1658 #ifdef USE_THREAD_DB
1659 thread_db_mourn (process
);
1662 for_each_thread (process
->pid
, [] (thread_info
*thread
)
1664 delete_lwp (get_thread_lwp (thread
));
1667 /* Freeing all private data. */
1668 priv
= process
->priv
;
1669 if (the_low_target
.delete_process
!= NULL
)
1670 the_low_target
.delete_process (priv
->arch_private
);
1672 gdb_assert (priv
->arch_private
== NULL
);
1674 process
->priv
= NULL
;
1676 remove_process (process
);
1680 linux_join (int pid
)
1685 ret
= my_waitpid (pid
, &status
, 0);
1686 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1688 } while (ret
!= -1 || errno
!= ECHILD
);
1691 /* Return nonzero if the given thread is still alive. */
1693 linux_thread_alive (ptid_t ptid
)
1695 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1697 /* We assume we always know if a thread exits. If a whole process
1698 exited but we still haven't been able to report it to GDB, we'll
1699 hold on to the last lwp of the dead process. */
1701 return !lwp_is_marked_dead (lwp
);
1706 /* Return 1 if this lwp still has an interesting status pending. If
1707 not (e.g., it had stopped for a breakpoint that is gone), return
1711 thread_still_has_status_pending_p (struct thread_info
*thread
)
1713 struct lwp_info
*lp
= get_thread_lwp (thread
);
1715 if (!lp
->status_pending_p
)
1718 if (thread
->last_resume_kind
!= resume_stop
1719 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1720 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1722 struct thread_info
*saved_thread
;
1726 gdb_assert (lp
->last_status
!= 0);
1730 saved_thread
= current_thread
;
1731 current_thread
= thread
;
1733 if (pc
!= lp
->stop_pc
)
1736 debug_printf ("PC of %ld changed\n",
1741 #if !USE_SIGTRAP_SIGINFO
1742 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1743 && !(*the_low_target
.breakpoint_at
) (pc
))
1746 debug_printf ("previous SW breakpoint of %ld gone\n",
1750 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1751 && !hardware_breakpoint_inserted_here (pc
))
1754 debug_printf ("previous HW breakpoint of %ld gone\n",
1760 current_thread
= saved_thread
;
1765 debug_printf ("discarding pending breakpoint status\n");
1766 lp
->status_pending_p
= 0;
1774 /* Returns true if LWP is resumed from the client's perspective. */
1777 lwp_resumed (struct lwp_info
*lwp
)
1779 struct thread_info
*thread
= get_lwp_thread (lwp
);
1781 if (thread
->last_resume_kind
!= resume_stop
)
1784 /* Did gdb send us a `vCont;t', but we haven't reported the
1785 corresponding stop to gdb yet? If so, the thread is still
1786 resumed/running from gdb's perspective. */
1787 if (thread
->last_resume_kind
== resume_stop
1788 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1794 /* Return true if this lwp has an interesting status pending. */
1796 status_pending_p_callback (thread_info
*thread
, ptid_t ptid
)
1798 struct lwp_info
*lp
= get_thread_lwp (thread
);
1800 /* Check if we're only interested in events from a specific process
1801 or a specific LWP. */
1802 if (!thread
->id
.matches (ptid
))
1805 if (!lwp_resumed (lp
))
1808 if (lp
->status_pending_p
1809 && !thread_still_has_status_pending_p (thread
))
1811 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1815 return lp
->status_pending_p
;
1819 find_lwp_pid (ptid_t ptid
)
1821 thread_info
*thread
= find_thread ([&] (thread_info
*thread
)
1823 int lwp
= ptid
.lwp () != 0 ? ptid
.lwp () : ptid
.pid ();
1824 return thread
->id
.lwp () == lwp
;
1830 return get_thread_lwp (thread
);
1833 /* Return the number of known LWPs in the tgid given by PID. */
1840 for_each_thread (pid
, [&] (thread_info
*thread
)
1848 /* See nat/linux-nat.h. */
1851 iterate_over_lwps (ptid_t filter
,
1852 iterate_over_lwps_ftype callback
,
1855 thread_info
*thread
= find_thread (filter
, [&] (thread_info
*thread
)
1857 lwp_info
*lwp
= get_thread_lwp (thread
);
1859 return callback (lwp
, data
);
1865 return get_thread_lwp (thread
);
1868 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1869 their exits until all other threads in the group have exited. */
1872 check_zombie_leaders (void)
1874 for_each_process ([] (process_info
*proc
) {
1875 pid_t leader_pid
= pid_of (proc
);
1876 struct lwp_info
*leader_lp
;
1878 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1881 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1882 "num_lwps=%d, zombie=%d\n",
1883 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1884 linux_proc_pid_is_zombie (leader_pid
));
1886 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1887 /* Check if there are other threads in the group, as we may
1888 have raced with the inferior simply exiting. */
1889 && !last_thread_of_process_p (leader_pid
)
1890 && linux_proc_pid_is_zombie (leader_pid
))
1892 /* A leader zombie can mean one of two things:
1894 - It exited, and there's an exit status pending
1895 available, or only the leader exited (not the whole
1896 program). In the latter case, we can't waitpid the
1897 leader's exit status until all other threads are gone.
1899 - There are 3 or more threads in the group, and a thread
1900 other than the leader exec'd. On an exec, the Linux
1901 kernel destroys all other threads (except the execing
1902 one) in the thread group, and resets the execing thread's
1903 tid to the tgid. No exit notification is sent for the
1904 execing thread -- from the ptracer's perspective, it
1905 appears as though the execing thread just vanishes.
1906 Until we reap all other threads except the leader and the
1907 execing thread, the leader will be zombie, and the
1908 execing thread will be in `D (disc sleep)'. As soon as
1909 all other threads are reaped, the execing thread changes
1910 it's tid to the tgid, and the previous (zombie) leader
1911 vanishes, giving place to the "new" leader. We could try
1912 distinguishing the exit and exec cases, by waiting once
1913 more, and seeing if something comes out, but it doesn't
1914 sound useful. The previous leader _does_ go away, and
1915 we'll re-add the new one once we see the exec event
1916 (which is just the same as what would happen if the
1917 previous leader did exit voluntarily before some other
1921 debug_printf ("CZL: Thread group leader %d zombie "
1922 "(it exited, or another thread execd).\n",
1925 delete_lwp (leader_lp
);
1930 /* Callback for `find_thread'. Returns the first LWP that is not
1934 not_stopped_callback (thread_info
*thread
, ptid_t filter
)
1936 if (!thread
->id
.matches (filter
))
1939 lwp_info
*lwp
= get_thread_lwp (thread
);
1941 return !lwp
->stopped
;
1944 /* Increment LWP's suspend count. */
1947 lwp_suspended_inc (struct lwp_info
*lwp
)
1951 if (debug_threads
&& lwp
->suspended
> 4)
1953 struct thread_info
*thread
= get_lwp_thread (lwp
);
1955 debug_printf ("LWP %ld has a suspiciously high suspend count,"
1956 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
1960 /* Decrement LWP's suspend count. */
1963 lwp_suspended_decr (struct lwp_info
*lwp
)
1967 if (lwp
->suspended
< 0)
1969 struct thread_info
*thread
= get_lwp_thread (lwp
);
1971 internal_error (__FILE__
, __LINE__
,
1972 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
1977 /* This function should only be called if the LWP got a SIGTRAP.
1979 Handle any tracepoint steps or hits. Return true if a tracepoint
1980 event was handled, 0 otherwise. */
1983 handle_tracepoints (struct lwp_info
*lwp
)
1985 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1986 int tpoint_related_event
= 0;
1988 gdb_assert (lwp
->suspended
== 0);
1990 /* If this tracepoint hit causes a tracing stop, we'll immediately
1991 uninsert tracepoints. To do this, we temporarily pause all
1992 threads, unpatch away, and then unpause threads. We need to make
1993 sure the unpausing doesn't resume LWP too. */
1994 lwp_suspended_inc (lwp
);
1996 /* And we need to be sure that any all-threads-stopping doesn't try
1997 to move threads out of the jump pads, as it could deadlock the
1998 inferior (LWP could be in the jump pad, maybe even holding the
2001 /* Do any necessary step collect actions. */
2002 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2004 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2006 /* See if we just hit a tracepoint and do its main collect
2008 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2010 lwp_suspended_decr (lwp
);
2012 gdb_assert (lwp
->suspended
== 0);
2013 gdb_assert (!stabilizing_threads
2014 || (lwp
->collecting_fast_tracepoint
2015 != fast_tpoint_collect_result::not_collecting
));
2017 if (tpoint_related_event
)
2020 debug_printf ("got a tracepoint event\n");
2027 /* Convenience wrapper. Returns information about LWP's fast tracepoint
2028 collection status. */
2030 static fast_tpoint_collect_result
2031 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2032 struct fast_tpoint_collect_status
*status
)
2034 CORE_ADDR thread_area
;
2035 struct thread_info
*thread
= get_lwp_thread (lwp
);
2037 if (the_low_target
.get_thread_area
== NULL
)
2038 return fast_tpoint_collect_result::not_collecting
;
2040 /* Get the thread area address. This is used to recognize which
2041 thread is which when tracing with the in-process agent library.
2042 We don't read anything from the address, and treat it as opaque;
2043 it's the address itself that we assume is unique per-thread. */
2044 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2045 return fast_tpoint_collect_result::not_collecting
;
2047 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2050 /* The reason we resume in the caller, is because we want to be able
2051 to pass lwp->status_pending as WSTAT, and we need to clear
2052 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2053 refuses to resume. */
2056 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2058 struct thread_info
*saved_thread
;
2060 saved_thread
= current_thread
;
2061 current_thread
= get_lwp_thread (lwp
);
2064 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2065 && supports_fast_tracepoints ()
2066 && agent_loaded_p ())
2068 struct fast_tpoint_collect_status status
;
2071 debug_printf ("Checking whether LWP %ld needs to move out of the "
2073 lwpid_of (current_thread
));
2075 fast_tpoint_collect_result r
2076 = linux_fast_tracepoint_collecting (lwp
, &status
);
2079 || (WSTOPSIG (*wstat
) != SIGILL
2080 && WSTOPSIG (*wstat
) != SIGFPE
2081 && WSTOPSIG (*wstat
) != SIGSEGV
2082 && WSTOPSIG (*wstat
) != SIGBUS
))
2084 lwp
->collecting_fast_tracepoint
= r
;
2086 if (r
!= fast_tpoint_collect_result::not_collecting
)
2088 if (r
== fast_tpoint_collect_result::before_insn
2089 && lwp
->exit_jump_pad_bkpt
== NULL
)
2091 /* Haven't executed the original instruction yet.
2092 Set breakpoint there, and wait till it's hit,
2093 then single-step until exiting the jump pad. */
2094 lwp
->exit_jump_pad_bkpt
2095 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2099 debug_printf ("Checking whether LWP %ld needs to move out of "
2100 "the jump pad...it does\n",
2101 lwpid_of (current_thread
));
2102 current_thread
= saved_thread
;
2109 /* If we get a synchronous signal while collecting, *and*
2110 while executing the (relocated) original instruction,
2111 reset the PC to point at the tpoint address, before
2112 reporting to GDB. Otherwise, it's an IPA lib bug: just
2113 report the signal to GDB, and pray for the best. */
2115 lwp
->collecting_fast_tracepoint
2116 = fast_tpoint_collect_result::not_collecting
;
2118 if (r
!= fast_tpoint_collect_result::not_collecting
2119 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2120 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2123 struct regcache
*regcache
;
2125 /* The si_addr on a few signals references the address
2126 of the faulting instruction. Adjust that as
2128 if ((WSTOPSIG (*wstat
) == SIGILL
2129 || WSTOPSIG (*wstat
) == SIGFPE
2130 || WSTOPSIG (*wstat
) == SIGBUS
2131 || WSTOPSIG (*wstat
) == SIGSEGV
)
2132 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2133 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2134 /* Final check just to make sure we don't clobber
2135 the siginfo of non-kernel-sent signals. */
2136 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2138 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2139 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2140 (PTRACE_TYPE_ARG3
) 0, &info
);
2143 regcache
= get_thread_regcache (current_thread
, 1);
2144 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2145 lwp
->stop_pc
= status
.tpoint_addr
;
2147 /* Cancel any fast tracepoint lock this thread was
2149 force_unlock_trace_buffer ();
2152 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2155 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2156 "stopping all threads momentarily.\n");
2158 stop_all_lwps (1, lwp
);
2160 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2161 lwp
->exit_jump_pad_bkpt
= NULL
;
2163 unstop_all_lwps (1, lwp
);
2165 gdb_assert (lwp
->suspended
>= 0);
2171 debug_printf ("Checking whether LWP %ld needs to move out of the "
2173 lwpid_of (current_thread
));
2175 current_thread
= saved_thread
;
2179 /* Enqueue one signal in the "signals to report later when out of the
2183 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2185 struct pending_signals
*p_sig
;
2186 struct thread_info
*thread
= get_lwp_thread (lwp
);
2189 debug_printf ("Deferring signal %d for LWP %ld.\n",
2190 WSTOPSIG (*wstat
), lwpid_of (thread
));
2194 struct pending_signals
*sig
;
2196 for (sig
= lwp
->pending_signals_to_report
;
2199 debug_printf (" Already queued %d\n",
2202 debug_printf (" (no more currently queued signals)\n");
2205 /* Don't enqueue non-RT signals if they are already in the deferred
2206 queue. (SIGSTOP being the easiest signal to see ending up here
2208 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2210 struct pending_signals
*sig
;
2212 for (sig
= lwp
->pending_signals_to_report
;
2216 if (sig
->signal
== WSTOPSIG (*wstat
))
2219 debug_printf ("Not requeuing already queued non-RT signal %d"
2228 p_sig
= XCNEW (struct pending_signals
);
2229 p_sig
->prev
= lwp
->pending_signals_to_report
;
2230 p_sig
->signal
= WSTOPSIG (*wstat
);
2232 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2235 lwp
->pending_signals_to_report
= p_sig
;
2238 /* Dequeue one signal from the "signals to report later when out of
2239 the jump pad" list. */
2242 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2244 struct thread_info
*thread
= get_lwp_thread (lwp
);
2246 if (lwp
->pending_signals_to_report
!= NULL
)
2248 struct pending_signals
**p_sig
;
2250 p_sig
= &lwp
->pending_signals_to_report
;
2251 while ((*p_sig
)->prev
!= NULL
)
2252 p_sig
= &(*p_sig
)->prev
;
2254 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2255 if ((*p_sig
)->info
.si_signo
!= 0)
2256 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2262 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2263 WSTOPSIG (*wstat
), lwpid_of (thread
));
2267 struct pending_signals
*sig
;
2269 for (sig
= lwp
->pending_signals_to_report
;
2272 debug_printf (" Still queued %d\n",
2275 debug_printf (" (no more queued signals)\n");
2284 /* Fetch the possibly triggered data watchpoint info and store it in
2287 On some archs, like x86, that use debug registers to set
2288 watchpoints, it's possible that the way to know which watched
2289 address trapped, is to check the register that is used to select
2290 which address to watch. Problem is, between setting the watchpoint
2291 and reading back which data address trapped, the user may change
2292 the set of watchpoints, and, as a consequence, GDB changes the
2293 debug registers in the inferior. To avoid reading back a stale
2294 stopped-data-address when that happens, we cache in LP the fact
2295 that a watchpoint trapped, and the corresponding data address, as
2296 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2297 registers meanwhile, we have the cached data we can rely on. */
2300 check_stopped_by_watchpoint (struct lwp_info
*child
)
2302 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2304 struct thread_info
*saved_thread
;
2306 saved_thread
= current_thread
;
2307 current_thread
= get_lwp_thread (child
);
2309 if (the_low_target
.stopped_by_watchpoint ())
2311 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2313 if (the_low_target
.stopped_data_address
!= NULL
)
2314 child
->stopped_data_address
2315 = the_low_target
.stopped_data_address ();
2317 child
->stopped_data_address
= 0;
2320 current_thread
= saved_thread
;
2323 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2326 /* Return the ptrace options that we want to try to enable. */
2329 linux_low_ptrace_options (int attached
)
2334 options
|= PTRACE_O_EXITKILL
;
2336 if (report_fork_events
)
2337 options
|= PTRACE_O_TRACEFORK
;
2339 if (report_vfork_events
)
2340 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2342 if (report_exec_events
)
2343 options
|= PTRACE_O_TRACEEXEC
;
2345 options
|= PTRACE_O_TRACESYSGOOD
;
2350 /* Do low-level handling of the event, and check if we should go on
2351 and pass it to caller code. Return the affected lwp if we are, or
2354 static struct lwp_info
*
2355 linux_low_filter_event (int lwpid
, int wstat
)
2357 struct lwp_info
*child
;
2358 struct thread_info
*thread
;
2359 int have_stop_pc
= 0;
2361 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2363 /* Check for stop events reported by a process we didn't already
2364 know about - anything not already in our LWP list.
2366 If we're expecting to receive stopped processes after
2367 fork, vfork, and clone events, then we'll just add the
2368 new one to our list and go back to waiting for the event
2369 to be reported - the stopped process might be returned
2370 from waitpid before or after the event is.
2372 But note the case of a non-leader thread exec'ing after the
2373 leader having exited, and gone from our lists (because
2374 check_zombie_leaders deleted it). The non-leader thread
2375 changes its tid to the tgid. */
2377 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2378 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2382 /* A multi-thread exec after we had seen the leader exiting. */
2385 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2386 "after exec.\n", lwpid
);
2389 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2390 child
= add_lwp (child_ptid
);
2392 current_thread
= child
->thread
;
2395 /* If we didn't find a process, one of two things presumably happened:
2396 - A process we started and then detached from has exited. Ignore it.
2397 - A process we are controlling has forked and the new child's stop
2398 was reported to us by the kernel. Save its PID. */
2399 if (child
== NULL
&& WIFSTOPPED (wstat
))
2401 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2404 else if (child
== NULL
)
2407 thread
= get_lwp_thread (child
);
2411 child
->last_status
= wstat
;
2413 /* Check if the thread has exited. */
2414 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2417 debug_printf ("LLFE: %d exited.\n", lwpid
);
2419 if (finish_step_over (child
))
2421 /* Unsuspend all other LWPs, and set them back running again. */
2422 unsuspend_all_lwps (child
);
2425 /* If there is at least one more LWP, then the exit signal was
2426 not the end of the debugged application and should be
2427 ignored, unless GDB wants to hear about thread exits. */
2428 if (report_thread_events
2429 || last_thread_of_process_p (pid_of (thread
)))
2431 /* Since events are serialized to GDB core, and we can't
2432 report this one right now. Leave the status pending for
2433 the next time we're able to report it. */
2434 mark_lwp_dead (child
, wstat
);
2444 gdb_assert (WIFSTOPPED (wstat
));
2446 if (WIFSTOPPED (wstat
))
2448 struct process_info
*proc
;
2450 /* Architecture-specific setup after inferior is running. */
2451 proc
= find_process_pid (pid_of (thread
));
2452 if (proc
->tdesc
== NULL
)
2456 /* This needs to happen after we have attached to the
2457 inferior and it is stopped for the first time, but
2458 before we access any inferior registers. */
2459 linux_arch_setup_thread (thread
);
2463 /* The process is started, but GDBserver will do
2464 architecture-specific setup after the program stops at
2465 the first instruction. */
2466 child
->status_pending_p
= 1;
2467 child
->status_pending
= wstat
;
2473 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2475 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2476 int options
= linux_low_ptrace_options (proc
->attached
);
2478 linux_enable_event_reporting (lwpid
, options
);
2479 child
->must_set_ptrace_flags
= 0;
2482 /* Always update syscall_state, even if it will be filtered later. */
2483 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2485 child
->syscall_state
2486 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2487 ? TARGET_WAITKIND_SYSCALL_RETURN
2488 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2492 /* Almost all other ptrace-stops are known to be outside of system
2493 calls, with further exceptions in handle_extended_wait. */
2494 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2497 /* Be careful to not overwrite stop_pc until save_stop_reason is
2499 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2500 && linux_is_extended_waitstatus (wstat
))
2502 child
->stop_pc
= get_pc (child
);
2503 if (handle_extended_wait (&child
, wstat
))
2505 /* The event has been handled, so just return without
2511 if (linux_wstatus_maybe_breakpoint (wstat
))
2513 if (save_stop_reason (child
))
2518 child
->stop_pc
= get_pc (child
);
2520 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2521 && child
->stop_expected
)
2524 debug_printf ("Expected stop.\n");
2525 child
->stop_expected
= 0;
2527 if (thread
->last_resume_kind
== resume_stop
)
2529 /* We want to report the stop to the core. Treat the
2530 SIGSTOP as a normal event. */
2532 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2533 target_pid_to_str (ptid_of (thread
)));
2535 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2537 /* Stopping threads. We don't want this SIGSTOP to end up
2540 debug_printf ("LLW: SIGSTOP caught for %s "
2541 "while stopping threads.\n",
2542 target_pid_to_str (ptid_of (thread
)));
2547 /* This is a delayed SIGSTOP. Filter out the event. */
2549 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2550 child
->stepping
? "step" : "continue",
2551 target_pid_to_str (ptid_of (thread
)));
2553 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2558 child
->status_pending_p
= 1;
2559 child
->status_pending
= wstat
;
2563 /* Return true if THREAD is doing hardware single step. */
2566 maybe_hw_step (struct thread_info
*thread
)
2568 if (can_hardware_single_step ())
2572 /* GDBserver must insert single-step breakpoint for software
2574 gdb_assert (has_single_step_breakpoints (thread
));
2579 /* Resume LWPs that are currently stopped without any pending status
2580 to report, but are resumed from the core's perspective. */
2583 resume_stopped_resumed_lwps (thread_info
*thread
)
2585 struct lwp_info
*lp
= get_thread_lwp (thread
);
2589 && !lp
->status_pending_p
2590 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2594 if (thread
->last_resume_kind
== resume_step
)
2595 step
= maybe_hw_step (thread
);
2598 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2599 target_pid_to_str (ptid_of (thread
)),
2600 paddress (lp
->stop_pc
),
2603 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2607 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2608 match FILTER_PTID (leaving others pending). The PTIDs can be:
2609 minus_one_ptid, to specify any child; a pid PTID, specifying all
2610 lwps of a thread group; or a PTID representing a single lwp. Store
2611 the stop status through the status pointer WSTAT. OPTIONS is
2612 passed to the waitpid call. Return 0 if no event was found and
2613 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2614 was found. Return the PID of the stopped child otherwise. */
2617 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2618 int *wstatp
, int options
)
2620 struct thread_info
*event_thread
;
2621 struct lwp_info
*event_child
, *requested_child
;
2622 sigset_t block_mask
, prev_mask
;
2625 /* N.B. event_thread points to the thread_info struct that contains
2626 event_child. Keep them in sync. */
2627 event_thread
= NULL
;
2629 requested_child
= NULL
;
2631 /* Check for a lwp with a pending status. */
2633 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2635 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2637 return status_pending_p_callback (thread
, filter_ptid
);
2640 if (event_thread
!= NULL
)
2641 event_child
= get_thread_lwp (event_thread
);
2642 if (debug_threads
&& event_thread
)
2643 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2645 else if (!ptid_equal (filter_ptid
, null_ptid
))
2647 requested_child
= find_lwp_pid (filter_ptid
);
2649 if (stopping_threads
== NOT_STOPPING_THREADS
2650 && requested_child
->status_pending_p
2651 && (requested_child
->collecting_fast_tracepoint
2652 != fast_tpoint_collect_result::not_collecting
))
2654 enqueue_one_deferred_signal (requested_child
,
2655 &requested_child
->status_pending
);
2656 requested_child
->status_pending_p
= 0;
2657 requested_child
->status_pending
= 0;
2658 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2661 if (requested_child
->suspended
2662 && requested_child
->status_pending_p
)
2664 internal_error (__FILE__
, __LINE__
,
2665 "requesting an event out of a"
2666 " suspended child?");
2669 if (requested_child
->status_pending_p
)
2671 event_child
= requested_child
;
2672 event_thread
= get_lwp_thread (event_child
);
2676 if (event_child
!= NULL
)
2679 debug_printf ("Got an event from pending child %ld (%04x)\n",
2680 lwpid_of (event_thread
), event_child
->status_pending
);
2681 *wstatp
= event_child
->status_pending
;
2682 event_child
->status_pending_p
= 0;
2683 event_child
->status_pending
= 0;
2684 current_thread
= event_thread
;
2685 return lwpid_of (event_thread
);
2688 /* But if we don't find a pending event, we'll have to wait.
2690 We only enter this loop if no process has a pending wait status.
2691 Thus any action taken in response to a wait status inside this
2692 loop is responding as soon as we detect the status, not after any
2695 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2696 all signals while here. */
2697 sigfillset (&block_mask
);
2698 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2700 /* Always pull all events out of the kernel. We'll randomly select
2701 an event LWP out of all that have events, to prevent
2703 while (event_child
== NULL
)
2707 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2710 - If the thread group leader exits while other threads in the
2711 thread group still exist, waitpid(TGID, ...) hangs. That
2712 waitpid won't return an exit status until the other threads
2713 in the group are reaped.
2715 - When a non-leader thread execs, that thread just vanishes
2716 without reporting an exit (so we'd hang if we waited for it
2717 explicitly in that case). The exec event is reported to
2720 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2723 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2724 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2730 debug_printf ("LLW: waitpid %ld received %s\n",
2731 (long) ret
, status_to_str (*wstatp
));
2734 /* Filter all events. IOW, leave all events pending. We'll
2735 randomly select an event LWP out of all that have events
2737 linux_low_filter_event (ret
, *wstatp
);
2738 /* Retry until nothing comes out of waitpid. A single
2739 SIGCHLD can indicate more than one child stopped. */
2743 /* Now that we've pulled all events out of the kernel, resume
2744 LWPs that don't have an interesting event to report. */
2745 if (stopping_threads
== NOT_STOPPING_THREADS
)
2746 for_each_thread (resume_stopped_resumed_lwps
);
2748 /* ... and find an LWP with a status to report to the core, if
2750 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2752 return status_pending_p_callback (thread
, filter_ptid
);
2755 if (event_thread
!= NULL
)
2757 event_child
= get_thread_lwp (event_thread
);
2758 *wstatp
= event_child
->status_pending
;
2759 event_child
->status_pending_p
= 0;
2760 event_child
->status_pending
= 0;
2764 /* Check for zombie thread group leaders. Those can't be reaped
2765 until all other threads in the thread group are. */
2766 check_zombie_leaders ();
2768 auto not_stopped
= [&] (thread_info
*thread
)
2770 return not_stopped_callback (thread
, wait_ptid
);
2773 /* If there are no resumed children left in the set of LWPs we
2774 want to wait for, bail. We can't just block in
2775 waitpid/sigsuspend, because lwps might have been left stopped
2776 in trace-stop state, and we'd be stuck forever waiting for
2777 their status to change (which would only happen if we resumed
2778 them). Even if WNOHANG is set, this return code is preferred
2779 over 0 (below), as it is more detailed. */
2780 if (find_thread (not_stopped
) == NULL
)
2783 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2784 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2788 /* No interesting event to report to the caller. */
2789 if ((options
& WNOHANG
))
2792 debug_printf ("WNOHANG set, no event found\n");
2794 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2798 /* Block until we get an event reported with SIGCHLD. */
2800 debug_printf ("sigsuspend'ing\n");
2802 sigsuspend (&prev_mask
);
2803 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2807 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2809 current_thread
= event_thread
;
2811 return lwpid_of (event_thread
);
2814 /* Wait for an event from child(ren) PTID. PTIDs can be:
2815 minus_one_ptid, to specify any child; a pid PTID, specifying all
2816 lwps of a thread group; or a PTID representing a single lwp. Store
2817 the stop status through the status pointer WSTAT. OPTIONS is
2818 passed to the waitpid call. Return 0 if no event was found and
2819 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2820 was found. Return the PID of the stopped child otherwise. */
2823 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2825 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2828 /* Select one LWP out of those that have events pending. */
2831 select_event_lwp (struct lwp_info
**orig_lp
)
2833 int random_selector
;
2834 struct thread_info
*event_thread
= NULL
;
2836 /* In all-stop, give preference to the LWP that is being
2837 single-stepped. There will be at most one, and it's the LWP that
2838 the core is most interested in. If we didn't do this, then we'd
2839 have to handle pending step SIGTRAPs somehow in case the core
2840 later continues the previously-stepped thread, otherwise we'd
2841 report the pending SIGTRAP, and the core, not having stepped the
2842 thread, wouldn't understand what the trap was for, and therefore
2843 would report it to the user as a random signal. */
2846 event_thread
= find_thread ([] (thread_info
*thread
)
2848 lwp_info
*lp
= get_thread_lwp (thread
);
2850 return (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2851 && thread
->last_resume_kind
== resume_step
2852 && lp
->status_pending_p
);
2855 if (event_thread
!= NULL
)
2858 debug_printf ("SEL: Select single-step %s\n",
2859 target_pid_to_str (ptid_of (event_thread
)));
2862 if (event_thread
== NULL
)
2864 /* No single-stepping LWP. Select one at random, out of those
2865 which have had events. */
2867 /* First see how many events we have. */
2869 for_each_thread ([&] (thread_info
*thread
)
2871 lwp_info
*lp
= get_thread_lwp (thread
);
2873 /* Count only resumed LWPs that have an event pending. */
2874 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2875 && lp
->status_pending_p
)
2878 gdb_assert (num_events
> 0);
2880 /* Now randomly pick a LWP out of those that have had
2882 random_selector
= (int)
2883 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2885 if (debug_threads
&& num_events
> 1)
2886 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2887 num_events
, random_selector
);
2889 event_thread
= find_thread ([&] (thread_info
*thread
)
2891 lwp_info
*lp
= get_thread_lwp (thread
);
2893 /* Select only resumed LWPs that have an event pending. */
2894 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2895 && lp
->status_pending_p
)
2896 if (random_selector
-- == 0)
2903 if (event_thread
!= NULL
)
2905 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2907 /* Switch the event LWP. */
2908 *orig_lp
= event_lp
;
2912 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2916 unsuspend_all_lwps (struct lwp_info
*except
)
2918 for_each_thread ([&] (thread_info
*thread
)
2920 lwp_info
*lwp
= get_thread_lwp (thread
);
2923 lwp_suspended_decr (lwp
);
2927 static void move_out_of_jump_pad_callback (thread_info
*thread
);
2928 static bool stuck_in_jump_pad_callback (thread_info
*thread
);
2929 static bool lwp_running (thread_info
*thread
);
2930 static ptid_t
linux_wait_1 (ptid_t ptid
,
2931 struct target_waitstatus
*ourstatus
,
2932 int target_options
);
2934 /* Stabilize threads (move out of jump pads).
2936 If a thread is midway collecting a fast tracepoint, we need to
2937 finish the collection and move it out of the jump pad before
2938 reporting the signal.
2940 This avoids recursion while collecting (when a signal arrives
2941 midway, and the signal handler itself collects), which would trash
2942 the trace buffer. In case the user set a breakpoint in a signal
2943 handler, this avoids the backtrace showing the jump pad, etc..
2944 Most importantly, there are certain things we can't do safely if
2945 threads are stopped in a jump pad (or in its callee's). For
2948 - starting a new trace run. A thread still collecting the
2949 previous run, could trash the trace buffer when resumed. The trace
2950 buffer control structures would have been reset but the thread had
2951 no way to tell. The thread could even midway memcpy'ing to the
2952 buffer, which would mean that when resumed, it would clobber the
2953 trace buffer that had been set for a new run.
2955 - we can't rewrite/reuse the jump pads for new tracepoints
2956 safely. Say you do tstart while a thread is stopped midway while
2957 collecting. When the thread is later resumed, it finishes the
2958 collection, and returns to the jump pad, to execute the original
2959 instruction that was under the tracepoint jump at the time the
2960 older run had been started. If the jump pad had been rewritten
2961 since for something else in the new run, the thread would now
2962 execute the wrong / random instructions. */
2965 linux_stabilize_threads (void)
2967 thread_info
*thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
2969 if (thread_stuck
!= NULL
)
2972 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2973 lwpid_of (thread_stuck
));
2977 thread_info
*saved_thread
= current_thread
;
2979 stabilizing_threads
= 1;
2982 for_each_thread (move_out_of_jump_pad_callback
);
2984 /* Loop until all are stopped out of the jump pads. */
2985 while (find_thread (lwp_running
) != NULL
)
2987 struct target_waitstatus ourstatus
;
2988 struct lwp_info
*lwp
;
2991 /* Note that we go through the full wait even loop. While
2992 moving threads out of jump pad, we need to be able to step
2993 over internal breakpoints and such. */
2994 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2996 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2998 lwp
= get_thread_lwp (current_thread
);
3001 lwp_suspended_inc (lwp
);
3003 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3004 || current_thread
->last_resume_kind
== resume_stop
)
3006 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3007 enqueue_one_deferred_signal (lwp
, &wstat
);
3012 unsuspend_all_lwps (NULL
);
3014 stabilizing_threads
= 0;
3016 current_thread
= saved_thread
;
3020 thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
3022 if (thread_stuck
!= NULL
)
3023 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3024 lwpid_of (thread_stuck
));
3028 /* Convenience function that is called when the kernel reports an
3029 event that is not passed out to GDB. */
3032 ignore_event (struct target_waitstatus
*ourstatus
)
3034 /* If we got an event, there may still be others, as a single
3035 SIGCHLD can indicate more than one child stopped. This forces
3036 another target_wait call. */
3039 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3043 /* Convenience function that is called when the kernel reports an exit
3044 event. This decides whether to report the event to GDB as a
3045 process exit event, a thread exit event, or to suppress the
3049 filter_exit_event (struct lwp_info
*event_child
,
3050 struct target_waitstatus
*ourstatus
)
3052 struct thread_info
*thread
= get_lwp_thread (event_child
);
3053 ptid_t ptid
= ptid_of (thread
);
3055 if (!last_thread_of_process_p (pid_of (thread
)))
3057 if (report_thread_events
)
3058 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3060 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3062 delete_lwp (event_child
);
3067 /* Returns 1 if GDB is interested in any event_child syscalls. */
3070 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3072 struct thread_info
*thread
= get_lwp_thread (event_child
);
3073 struct process_info
*proc
= get_thread_process (thread
);
3075 return !proc
->syscalls_to_catch
.empty ();
3078 /* Returns 1 if GDB is interested in the event_child syscall.
3079 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3082 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3085 struct thread_info
*thread
= get_lwp_thread (event_child
);
3086 struct process_info
*proc
= get_thread_process (thread
);
3088 if (proc
->syscalls_to_catch
.empty ())
3091 if (proc
->syscalls_to_catch
[0] == ANY_SYSCALL
)
3094 get_syscall_trapinfo (event_child
, &sysno
);
3096 for (int iter
: proc
->syscalls_to_catch
)
3103 /* Wait for process, returns status. */
3106 linux_wait_1 (ptid_t ptid
,
3107 struct target_waitstatus
*ourstatus
, int target_options
)
3110 struct lwp_info
*event_child
;
3113 int step_over_finished
;
3114 int bp_explains_trap
;
3115 int maybe_internal_trap
;
3124 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3127 /* Translate generic target options into linux options. */
3129 if (target_options
& TARGET_WNOHANG
)
3132 bp_explains_trap
= 0;
3135 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3137 auto status_pending_p_any
= [&] (thread_info
*thread
)
3139 return status_pending_p_callback (thread
, minus_one_ptid
);
3142 auto not_stopped
= [&] (thread_info
*thread
)
3144 return not_stopped_callback (thread
, minus_one_ptid
);
3147 /* Find a resumed LWP, if any. */
3148 if (find_thread (status_pending_p_any
) != NULL
)
3150 else if (find_thread (not_stopped
) != NULL
)
3155 if (ptid_equal (step_over_bkpt
, null_ptid
))
3156 pid
= linux_wait_for_event (ptid
, &w
, options
);
3160 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3161 target_pid_to_str (step_over_bkpt
));
3162 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3165 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3167 gdb_assert (target_options
& TARGET_WNOHANG
);
3171 debug_printf ("linux_wait_1 ret = null_ptid, "
3172 "TARGET_WAITKIND_IGNORE\n");
3176 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3183 debug_printf ("linux_wait_1 ret = null_ptid, "
3184 "TARGET_WAITKIND_NO_RESUMED\n");
3188 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3192 event_child
= get_thread_lwp (current_thread
);
3194 /* linux_wait_for_event only returns an exit status for the last
3195 child of a process. Report it. */
3196 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3200 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3201 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3205 debug_printf ("linux_wait_1 ret = %s, exited with "
3207 target_pid_to_str (ptid_of (current_thread
)),
3214 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3215 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3219 debug_printf ("linux_wait_1 ret = %s, terminated with "
3221 target_pid_to_str (ptid_of (current_thread
)),
3227 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3228 return filter_exit_event (event_child
, ourstatus
);
3230 return ptid_of (current_thread
);
3233 /* If step-over executes a breakpoint instruction, in the case of a
3234 hardware single step it means a gdb/gdbserver breakpoint had been
3235 planted on top of a permanent breakpoint, in the case of a software
3236 single step it may just mean that gdbserver hit the reinsert breakpoint.
3237 The PC has been adjusted by save_stop_reason to point at
3238 the breakpoint address.
3239 So in the case of the hardware single step advance the PC manually
3240 past the breakpoint and in the case of software single step advance only
3241 if it's not the single_step_breakpoint we are hitting.
3242 This avoids that a program would keep trapping a permanent breakpoint
3244 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3245 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3246 && (event_child
->stepping
3247 || !single_step_breakpoint_inserted_here (event_child
->stop_pc
)))
3249 int increment_pc
= 0;
3250 int breakpoint_kind
= 0;
3251 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3254 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3255 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3259 debug_printf ("step-over for %s executed software breakpoint\n",
3260 target_pid_to_str (ptid_of (current_thread
)));
3263 if (increment_pc
!= 0)
3265 struct regcache
*regcache
3266 = get_thread_regcache (current_thread
, 1);
3268 event_child
->stop_pc
+= increment_pc
;
3269 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3271 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3272 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3276 /* If this event was not handled before, and is not a SIGTRAP, we
3277 report it. SIGILL and SIGSEGV are also treated as traps in case
3278 a breakpoint is inserted at the current PC. If this target does
3279 not support internal breakpoints at all, we also report the
3280 SIGTRAP without further processing; it's of no concern to us. */
3282 = (supports_breakpoints ()
3283 && (WSTOPSIG (w
) == SIGTRAP
3284 || ((WSTOPSIG (w
) == SIGILL
3285 || WSTOPSIG (w
) == SIGSEGV
)
3286 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3288 if (maybe_internal_trap
)
3290 /* Handle anything that requires bookkeeping before deciding to
3291 report the event or continue waiting. */
3293 /* First check if we can explain the SIGTRAP with an internal
3294 breakpoint, or if we should possibly report the event to GDB.
3295 Do this before anything that may remove or insert a
3297 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3299 /* We have a SIGTRAP, possibly a step-over dance has just
3300 finished. If so, tweak the state machine accordingly,
3301 reinsert breakpoints and delete any single-step
3303 step_over_finished
= finish_step_over (event_child
);
3305 /* Now invoke the callbacks of any internal breakpoints there. */
3306 check_breakpoints (event_child
->stop_pc
);
3308 /* Handle tracepoint data collecting. This may overflow the
3309 trace buffer, and cause a tracing stop, removing
3311 trace_event
= handle_tracepoints (event_child
);
3313 if (bp_explains_trap
)
3316 debug_printf ("Hit a gdbserver breakpoint.\n");
3321 /* We have some other signal, possibly a step-over dance was in
3322 progress, and it should be cancelled too. */
3323 step_over_finished
= finish_step_over (event_child
);
3326 /* We have all the data we need. Either report the event to GDB, or
3327 resume threads and keep waiting for more. */
3329 /* If we're collecting a fast tracepoint, finish the collection and
3330 move out of the jump pad before delivering a signal. See
3331 linux_stabilize_threads. */
3334 && WSTOPSIG (w
) != SIGTRAP
3335 && supports_fast_tracepoints ()
3336 && agent_loaded_p ())
3339 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3340 "to defer or adjust it.\n",
3341 WSTOPSIG (w
), lwpid_of (current_thread
));
3343 /* Allow debugging the jump pad itself. */
3344 if (current_thread
->last_resume_kind
!= resume_step
3345 && maybe_move_out_of_jump_pad (event_child
, &w
))
3347 enqueue_one_deferred_signal (event_child
, &w
);
3350 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3351 WSTOPSIG (w
), lwpid_of (current_thread
));
3353 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3357 return ignore_event (ourstatus
);
3361 if (event_child
->collecting_fast_tracepoint
3362 != fast_tpoint_collect_result::not_collecting
)
3365 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3366 "Check if we're already there.\n",
3367 lwpid_of (current_thread
),
3368 (int) event_child
->collecting_fast_tracepoint
);
3372 event_child
->collecting_fast_tracepoint
3373 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3375 if (event_child
->collecting_fast_tracepoint
3376 != fast_tpoint_collect_result::before_insn
)
3378 /* No longer need this breakpoint. */
3379 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3382 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3383 "stopping all threads momentarily.\n");
3385 /* Other running threads could hit this breakpoint.
3386 We don't handle moribund locations like GDB does,
3387 instead we always pause all threads when removing
3388 breakpoints, so that any step-over or
3389 decr_pc_after_break adjustment is always taken
3390 care of while the breakpoint is still
3392 stop_all_lwps (1, event_child
);
3394 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3395 event_child
->exit_jump_pad_bkpt
= NULL
;
3397 unstop_all_lwps (1, event_child
);
3399 gdb_assert (event_child
->suspended
>= 0);
3403 if (event_child
->collecting_fast_tracepoint
3404 == fast_tpoint_collect_result::not_collecting
)
3407 debug_printf ("fast tracepoint finished "
3408 "collecting successfully.\n");
3410 /* We may have a deferred signal to report. */
3411 if (dequeue_one_deferred_signal (event_child
, &w
))
3414 debug_printf ("dequeued one signal.\n");
3419 debug_printf ("no deferred signals.\n");
3421 if (stabilizing_threads
)
3423 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3424 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3428 debug_printf ("linux_wait_1 ret = %s, stopped "
3429 "while stabilizing threads\n",
3430 target_pid_to_str (ptid_of (current_thread
)));
3434 return ptid_of (current_thread
);
3440 /* Check whether GDB would be interested in this event. */
3442 /* Check if GDB is interested in this syscall. */
3444 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3445 && !gdb_catch_this_syscall_p (event_child
))
3449 debug_printf ("Ignored syscall for LWP %ld.\n",
3450 lwpid_of (current_thread
));
3453 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3458 return ignore_event (ourstatus
);
3461 /* If GDB is not interested in this signal, don't stop other
3462 threads, and don't report it to GDB. Just resume the inferior
3463 right away. We do this for threading-related signals as well as
3464 any that GDB specifically requested we ignore. But never ignore
3465 SIGSTOP if we sent it ourselves, and do not ignore signals when
3466 stepping - they may require special handling to skip the signal
3467 handler. Also never ignore signals that could be caused by a
3470 && current_thread
->last_resume_kind
!= resume_step
3472 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3473 (current_process ()->priv
->thread_db
!= NULL
3474 && (WSTOPSIG (w
) == __SIGRTMIN
3475 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3478 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3479 && !(WSTOPSIG (w
) == SIGSTOP
3480 && current_thread
->last_resume_kind
== resume_stop
)
3481 && !linux_wstatus_maybe_breakpoint (w
))))
3483 siginfo_t info
, *info_p
;
3486 debug_printf ("Ignored signal %d for LWP %ld.\n",
3487 WSTOPSIG (w
), lwpid_of (current_thread
));
3489 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3490 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3495 if (step_over_finished
)
3497 /* We cancelled this thread's step-over above. We still
3498 need to unsuspend all other LWPs, and set them back
3499 running again while the signal handler runs. */
3500 unsuspend_all_lwps (event_child
);
3502 /* Enqueue the pending signal info so that proceed_all_lwps
3504 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3506 proceed_all_lwps ();
3510 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3511 WSTOPSIG (w
), info_p
);
3517 return ignore_event (ourstatus
);
3520 /* Note that all addresses are always "out of the step range" when
3521 there's no range to begin with. */
3522 in_step_range
= lwp_in_step_range (event_child
);
3524 /* If GDB wanted this thread to single step, and the thread is out
3525 of the step range, we always want to report the SIGTRAP, and let
3526 GDB handle it. Watchpoints should always be reported. So should
3527 signals we can't explain. A SIGTRAP we can't explain could be a
3528 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3529 do, we're be able to handle GDB breakpoints on top of internal
3530 breakpoints, by handling the internal breakpoint and still
3531 reporting the event to GDB. If we don't, we're out of luck, GDB
3532 won't see the breakpoint hit. If we see a single-step event but
3533 the thread should be continuing, don't pass the trap to gdb.
3534 That indicates that we had previously finished a single-step but
3535 left the single-step pending -- see
3536 complete_ongoing_step_over. */
3537 report_to_gdb
= (!maybe_internal_trap
3538 || (current_thread
->last_resume_kind
== resume_step
3540 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3542 && !bp_explains_trap
3544 && !step_over_finished
3545 && !(current_thread
->last_resume_kind
== resume_continue
3546 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3547 || (gdb_breakpoint_here (event_child
->stop_pc
)
3548 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3549 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3550 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3552 run_breakpoint_commands (event_child
->stop_pc
);
3554 /* We found no reason GDB would want us to stop. We either hit one
3555 of our own breakpoints, or finished an internal step GDB
3556 shouldn't know about. */
3561 if (bp_explains_trap
)
3562 debug_printf ("Hit a gdbserver breakpoint.\n");
3563 if (step_over_finished
)
3564 debug_printf ("Step-over finished.\n");
3566 debug_printf ("Tracepoint event.\n");
3567 if (lwp_in_step_range (event_child
))
3568 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3569 paddress (event_child
->stop_pc
),
3570 paddress (event_child
->step_range_start
),
3571 paddress (event_child
->step_range_end
));
3574 /* We're not reporting this breakpoint to GDB, so apply the
3575 decr_pc_after_break adjustment to the inferior's regcache
3578 if (the_low_target
.set_pc
!= NULL
)
3580 struct regcache
*regcache
3581 = get_thread_regcache (current_thread
, 1);
3582 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3585 if (step_over_finished
)
3587 /* If we have finished stepping over a breakpoint, we've
3588 stopped and suspended all LWPs momentarily except the
3589 stepping one. This is where we resume them all again.
3590 We're going to keep waiting, so use proceed, which
3591 handles stepping over the next breakpoint. */
3592 unsuspend_all_lwps (event_child
);
3596 /* Remove the single-step breakpoints if any. Note that
3597 there isn't single-step breakpoint if we finished stepping
3599 if (can_software_single_step ()
3600 && has_single_step_breakpoints (current_thread
))
3602 stop_all_lwps (0, event_child
);
3603 delete_single_step_breakpoints (current_thread
);
3604 unstop_all_lwps (0, event_child
);
3609 debug_printf ("proceeding all threads.\n");
3610 proceed_all_lwps ();
3615 return ignore_event (ourstatus
);
3620 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3623 = target_waitstatus_to_string (&event_child
->waitstatus
);
3625 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3626 lwpid_of (get_lwp_thread (event_child
)), str
.c_str ());
3628 if (current_thread
->last_resume_kind
== resume_step
)
3630 if (event_child
->step_range_start
== event_child
->step_range_end
)
3631 debug_printf ("GDB wanted to single-step, reporting event.\n");
3632 else if (!lwp_in_step_range (event_child
))
3633 debug_printf ("Out of step range, reporting event.\n");
3635 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3636 debug_printf ("Stopped by watchpoint.\n");
3637 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3638 debug_printf ("Stopped by GDB breakpoint.\n");
3640 debug_printf ("Hit a non-gdbserver trap event.\n");
3643 /* Alright, we're going to report a stop. */
3645 /* Remove single-step breakpoints. */
3646 if (can_software_single_step ())
3648 /* Remove single-step breakpoints or not. It it is true, stop all
3649 lwps, so that other threads won't hit the breakpoint in the
3651 int remove_single_step_breakpoints_p
= 0;
3655 remove_single_step_breakpoints_p
3656 = has_single_step_breakpoints (current_thread
);
3660 /* In all-stop, a stop reply cancels all previous resume
3661 requests. Delete all single-step breakpoints. */
3663 find_thread ([&] (thread_info
*thread
) {
3664 if (has_single_step_breakpoints (thread
))
3666 remove_single_step_breakpoints_p
= 1;
3674 if (remove_single_step_breakpoints_p
)
3676 /* If we remove single-step breakpoints from memory, stop all lwps,
3677 so that other threads won't hit the breakpoint in the staled
3679 stop_all_lwps (0, event_child
);
3683 gdb_assert (has_single_step_breakpoints (current_thread
));
3684 delete_single_step_breakpoints (current_thread
);
3688 for_each_thread ([] (thread_info
*thread
){
3689 if (has_single_step_breakpoints (thread
))
3690 delete_single_step_breakpoints (thread
);
3694 unstop_all_lwps (0, event_child
);
3698 if (!stabilizing_threads
)
3700 /* In all-stop, stop all threads. */
3702 stop_all_lwps (0, NULL
);
3704 if (step_over_finished
)
3708 /* If we were doing a step-over, all other threads but
3709 the stepping one had been paused in start_step_over,
3710 with their suspend counts incremented. We don't want
3711 to do a full unstop/unpause, because we're in
3712 all-stop mode (so we want threads stopped), but we
3713 still need to unsuspend the other threads, to
3714 decrement their `suspended' count back. */
3715 unsuspend_all_lwps (event_child
);
3719 /* If we just finished a step-over, then all threads had
3720 been momentarily paused. In all-stop, that's fine,
3721 we want threads stopped by now anyway. In non-stop,
3722 we need to re-resume threads that GDB wanted to be
3724 unstop_all_lwps (1, event_child
);
3728 /* If we're not waiting for a specific LWP, choose an event LWP
3729 from among those that have had events. Giving equal priority
3730 to all LWPs that have had events helps prevent
3732 if (ptid_equal (ptid
, minus_one_ptid
))
3734 event_child
->status_pending_p
= 1;
3735 event_child
->status_pending
= w
;
3737 select_event_lwp (&event_child
);
3739 /* current_thread and event_child must stay in sync. */
3740 current_thread
= get_lwp_thread (event_child
);
3742 event_child
->status_pending_p
= 0;
3743 w
= event_child
->status_pending
;
3747 /* Stabilize threads (move out of jump pads). */
3749 stabilize_threads ();
3753 /* If we just finished a step-over, then all threads had been
3754 momentarily paused. In all-stop, that's fine, we want
3755 threads stopped by now anyway. In non-stop, we need to
3756 re-resume threads that GDB wanted to be running. */
3757 if (step_over_finished
)
3758 unstop_all_lwps (1, event_child
);
3761 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3763 /* If the reported event is an exit, fork, vfork or exec, let
3766 /* Break the unreported fork relationship chain. */
3767 if (event_child
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
3768 || event_child
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
)
3770 event_child
->fork_relative
->fork_relative
= NULL
;
3771 event_child
->fork_relative
= NULL
;
3774 *ourstatus
= event_child
->waitstatus
;
3775 /* Clear the event lwp's waitstatus since we handled it already. */
3776 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3779 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3781 /* Now that we've selected our final event LWP, un-adjust its PC if
3782 it was a software breakpoint, and the client doesn't know we can
3783 adjust the breakpoint ourselves. */
3784 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3785 && !swbreak_feature
)
3787 int decr_pc
= the_low_target
.decr_pc_after_break
;
3791 struct regcache
*regcache
3792 = get_thread_regcache (current_thread
, 1);
3793 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3797 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3799 get_syscall_trapinfo (event_child
,
3800 &ourstatus
->value
.syscall_number
);
3801 ourstatus
->kind
= event_child
->syscall_state
;
3803 else if (current_thread
->last_resume_kind
== resume_stop
3804 && WSTOPSIG (w
) == SIGSTOP
)
3806 /* A thread that has been requested to stop by GDB with vCont;t,
3807 and it stopped cleanly, so report as SIG0. The use of
3808 SIGSTOP is an implementation detail. */
3809 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3811 else if (current_thread
->last_resume_kind
== resume_stop
3812 && WSTOPSIG (w
) != SIGSTOP
)
3814 /* A thread that has been requested to stop by GDB with vCont;t,
3815 but, it stopped for other reasons. */
3816 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3818 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3820 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3823 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3827 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3828 target_pid_to_str (ptid_of (current_thread
)),
3829 ourstatus
->kind
, ourstatus
->value
.sig
);
3833 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3834 return filter_exit_event (event_child
, ourstatus
);
3836 return ptid_of (current_thread
);
3839 /* Get rid of any pending event in the pipe. */
3841 async_file_flush (void)
3847 ret
= read (linux_event_pipe
[0], &buf
, 1);
3848 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3851 /* Put something in the pipe, so the event loop wakes up. */
3853 async_file_mark (void)
3857 async_file_flush ();
3860 ret
= write (linux_event_pipe
[1], "+", 1);
3861 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3863 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3864 be awakened anyway. */
3868 linux_wait (ptid_t ptid
,
3869 struct target_waitstatus
*ourstatus
, int target_options
)
3873 /* Flush the async file first. */
3874 if (target_is_async_p ())
3875 async_file_flush ();
3879 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3881 while ((target_options
& TARGET_WNOHANG
) == 0
3882 && ptid_equal (event_ptid
, null_ptid
)
3883 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3885 /* If at least one stop was reported, there may be more. A single
3886 SIGCHLD can signal more than one child stop. */
3887 if (target_is_async_p ()
3888 && (target_options
& TARGET_WNOHANG
) != 0
3889 && !ptid_equal (event_ptid
, null_ptid
))
3895 /* Send a signal to an LWP. */
3898 kill_lwp (unsigned long lwpid
, int signo
)
3903 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3904 if (errno
== ENOSYS
)
3906 /* If tkill fails, then we are not using nptl threads, a
3907 configuration we no longer support. */
3908 perror_with_name (("tkill"));
3914 linux_stop_lwp (struct lwp_info
*lwp
)
3920 send_sigstop (struct lwp_info
*lwp
)
3924 pid
= lwpid_of (get_lwp_thread (lwp
));
3926 /* If we already have a pending stop signal for this process, don't
3928 if (lwp
->stop_expected
)
3931 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3937 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3939 lwp
->stop_expected
= 1;
3940 kill_lwp (pid
, SIGSTOP
);
3944 send_sigstop (thread_info
*thread
, lwp_info
*except
)
3946 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3948 /* Ignore EXCEPT. */
3958 /* Increment the suspend count of an LWP, and stop it, if not stopped
3961 suspend_and_send_sigstop (thread_info
*thread
, lwp_info
*except
)
3963 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3965 /* Ignore EXCEPT. */
3969 lwp_suspended_inc (lwp
);
3971 send_sigstop (thread
, except
);
3975 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3977 /* Store the exit status for later. */
3978 lwp
->status_pending_p
= 1;
3979 lwp
->status_pending
= wstat
;
3981 /* Store in waitstatus as well, as there's nothing else to process
3983 if (WIFEXITED (wstat
))
3985 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
3986 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
3988 else if (WIFSIGNALED (wstat
))
3990 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
3991 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
3994 /* Prevent trying to stop it. */
3997 /* No further stops are expected from a dead lwp. */
3998 lwp
->stop_expected
= 0;
4001 /* Return true if LWP has exited already, and has a pending exit event
4002 to report to GDB. */
4005 lwp_is_marked_dead (struct lwp_info
*lwp
)
4007 return (lwp
->status_pending_p
4008 && (WIFEXITED (lwp
->status_pending
)
4009 || WIFSIGNALED (lwp
->status_pending
)));
4012 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4015 wait_for_sigstop (void)
4017 struct thread_info
*saved_thread
;
4022 saved_thread
= current_thread
;
4023 if (saved_thread
!= NULL
)
4024 saved_tid
= saved_thread
->id
;
4026 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4029 debug_printf ("wait_for_sigstop: pulling events\n");
4031 /* Passing NULL_PTID as filter indicates we want all events to be
4032 left pending. Eventually this returns when there are no
4033 unwaited-for children left. */
4034 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4036 gdb_assert (ret
== -1);
4038 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4039 current_thread
= saved_thread
;
4043 debug_printf ("Previously current thread died.\n");
4045 /* We can't change the current inferior behind GDB's back,
4046 otherwise, a subsequent command may apply to the wrong
4048 current_thread
= NULL
;
4052 /* Returns true if THREAD is stopped in a jump pad, and we can't
4053 move it out, because we need to report the stop event to GDB. For
4054 example, if the user puts a breakpoint in the jump pad, it's
4055 because she wants to debug it. */
4058 stuck_in_jump_pad_callback (thread_info
*thread
)
4060 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4062 if (lwp
->suspended
!= 0)
4064 internal_error (__FILE__
, __LINE__
,
4065 "LWP %ld is suspended, suspended=%d\n",
4066 lwpid_of (thread
), lwp
->suspended
);
4068 gdb_assert (lwp
->stopped
);
4070 /* Allow debugging the jump pad, gdb_collect, etc.. */
4071 return (supports_fast_tracepoints ()
4072 && agent_loaded_p ()
4073 && (gdb_breakpoint_here (lwp
->stop_pc
)
4074 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4075 || thread
->last_resume_kind
== resume_step
)
4076 && (linux_fast_tracepoint_collecting (lwp
, NULL
)
4077 != fast_tpoint_collect_result::not_collecting
));
4081 move_out_of_jump_pad_callback (thread_info
*thread
)
4083 struct thread_info
*saved_thread
;
4084 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4087 if (lwp
->suspended
!= 0)
4089 internal_error (__FILE__
, __LINE__
,
4090 "LWP %ld is suspended, suspended=%d\n",
4091 lwpid_of (thread
), lwp
->suspended
);
4093 gdb_assert (lwp
->stopped
);
4095 /* For gdb_breakpoint_here. */
4096 saved_thread
= current_thread
;
4097 current_thread
= thread
;
4099 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4101 /* Allow debugging the jump pad, gdb_collect, etc. */
4102 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4103 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4104 && thread
->last_resume_kind
!= resume_step
4105 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4108 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4113 lwp
->status_pending_p
= 0;
4114 enqueue_one_deferred_signal (lwp
, wstat
);
4117 debug_printf ("Signal %d for LWP %ld deferred "
4119 WSTOPSIG (*wstat
), lwpid_of (thread
));
4122 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4125 lwp_suspended_inc (lwp
);
4127 current_thread
= saved_thread
;
4131 lwp_running (thread_info
*thread
)
4133 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4135 if (lwp_is_marked_dead (lwp
))
4138 return !lwp
->stopped
;
4141 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4142 If SUSPEND, then also increase the suspend count of every LWP,
4146 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4148 /* Should not be called recursively. */
4149 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4154 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4155 suspend
? "stop-and-suspend" : "stop",
4157 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4161 stopping_threads
= (suspend
4162 ? STOPPING_AND_SUSPENDING_THREADS
4163 : STOPPING_THREADS
);
4166 for_each_thread ([&] (thread_info
*thread
)
4168 suspend_and_send_sigstop (thread
, except
);
4171 for_each_thread ([&] (thread_info
*thread
)
4173 send_sigstop (thread
, except
);
4176 wait_for_sigstop ();
4177 stopping_threads
= NOT_STOPPING_THREADS
;
4181 debug_printf ("stop_all_lwps done, setting stopping_threads "
4182 "back to !stopping\n");
4187 /* Enqueue one signal in the chain of signals which need to be
4188 delivered to this process on next resume. */
4191 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4193 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4195 p_sig
->prev
= lwp
->pending_signals
;
4196 p_sig
->signal
= signal
;
4198 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4200 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4201 lwp
->pending_signals
= p_sig
;
4204 /* Install breakpoints for software single stepping. */
4207 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4209 struct thread_info
*thread
= get_lwp_thread (lwp
);
4210 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4212 scoped_restore save_current_thread
= make_scoped_restore (¤t_thread
);
4214 current_thread
= thread
;
4215 std::vector
<CORE_ADDR
> next_pcs
= the_low_target
.get_next_pcs (regcache
);
4217 for (CORE_ADDR pc
: next_pcs
)
4218 set_single_step_breakpoint (pc
, current_ptid
);
4221 /* Single step via hardware or software single step.
4222 Return 1 if hardware single stepping, 0 if software single stepping
4223 or can't single step. */
4226 single_step (struct lwp_info
* lwp
)
4230 if (can_hardware_single_step ())
4234 else if (can_software_single_step ())
4236 install_software_single_step_breakpoints (lwp
);
4242 debug_printf ("stepping is not implemented on this target");
4248 /* The signal can be delivered to the inferior if we are not trying to
4249 finish a fast tracepoint collect. Since signal can be delivered in
4250 the step-over, the program may go to signal handler and trap again
4251 after return from the signal handler. We can live with the spurious
4255 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4257 return (lwp
->collecting_fast_tracepoint
4258 == fast_tpoint_collect_result::not_collecting
);
4261 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4262 SIGNAL is nonzero, give it that signal. */
4265 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4266 int step
, int signal
, siginfo_t
*info
)
4268 struct thread_info
*thread
= get_lwp_thread (lwp
);
4269 struct thread_info
*saved_thread
;
4271 struct process_info
*proc
= get_thread_process (thread
);
4273 /* Note that target description may not be initialised
4274 (proc->tdesc == NULL) at this point because the program hasn't
4275 stopped at the first instruction yet. It means GDBserver skips
4276 the extra traps from the wrapper program (see option --wrapper).
4277 Code in this function that requires register access should be
4278 guarded by proc->tdesc == NULL or something else. */
4280 if (lwp
->stopped
== 0)
4283 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4285 fast_tpoint_collect_result fast_tp_collecting
4286 = lwp
->collecting_fast_tracepoint
;
4288 gdb_assert (!stabilizing_threads
4289 || (fast_tp_collecting
4290 != fast_tpoint_collect_result::not_collecting
));
4292 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4293 user used the "jump" command, or "set $pc = foo"). */
4294 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4296 /* Collecting 'while-stepping' actions doesn't make sense
4298 release_while_stepping_state_list (thread
);
4301 /* If we have pending signals or status, and a new signal, enqueue the
4302 signal. Also enqueue the signal if it can't be delivered to the
4303 inferior right now. */
4305 && (lwp
->status_pending_p
4306 || lwp
->pending_signals
!= NULL
4307 || !lwp_signal_can_be_delivered (lwp
)))
4309 enqueue_pending_signal (lwp
, signal
, info
);
4311 /* Postpone any pending signal. It was enqueued above. */
4315 if (lwp
->status_pending_p
)
4318 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4319 " has pending status\n",
4320 lwpid_of (thread
), step
? "step" : "continue",
4321 lwp
->stop_expected
? "expected" : "not expected");
4325 saved_thread
= current_thread
;
4326 current_thread
= thread
;
4328 /* This bit needs some thinking about. If we get a signal that
4329 we must report while a single-step reinsert is still pending,
4330 we often end up resuming the thread. It might be better to
4331 (ew) allow a stack of pending events; then we could be sure that
4332 the reinsert happened right away and not lose any signals.
4334 Making this stack would also shrink the window in which breakpoints are
4335 uninserted (see comment in linux_wait_for_lwp) but not enough for
4336 complete correctness, so it won't solve that problem. It may be
4337 worthwhile just to solve this one, however. */
4338 if (lwp
->bp_reinsert
!= 0)
4341 debug_printf (" pending reinsert at 0x%s\n",
4342 paddress (lwp
->bp_reinsert
));
4344 if (can_hardware_single_step ())
4346 if (fast_tp_collecting
== fast_tpoint_collect_result::not_collecting
)
4349 warning ("BAD - reinserting but not stepping.");
4351 warning ("BAD - reinserting and suspended(%d).",
4356 step
= maybe_hw_step (thread
);
4359 if (fast_tp_collecting
== fast_tpoint_collect_result::before_insn
)
4362 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4363 " (exit-jump-pad-bkpt)\n",
4366 else if (fast_tp_collecting
== fast_tpoint_collect_result::at_insn
)
4369 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4370 " single-stepping\n",
4373 if (can_hardware_single_step ())
4377 internal_error (__FILE__
, __LINE__
,
4378 "moving out of jump pad single-stepping"
4379 " not implemented on this target");
4383 /* If we have while-stepping actions in this thread set it stepping.
4384 If we have a signal to deliver, it may or may not be set to
4385 SIG_IGN, we don't know. Assume so, and allow collecting
4386 while-stepping into a signal handler. A possible smart thing to
4387 do would be to set an internal breakpoint at the signal return
4388 address, continue, and carry on catching this while-stepping
4389 action only when that breakpoint is hit. A future
4391 if (thread
->while_stepping
!= NULL
)
4394 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4397 step
= single_step (lwp
);
4400 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4402 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4404 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4408 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4409 (long) lwp
->stop_pc
);
4413 /* If we have pending signals, consume one if it can be delivered to
4415 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4417 struct pending_signals
**p_sig
;
4419 p_sig
= &lwp
->pending_signals
;
4420 while ((*p_sig
)->prev
!= NULL
)
4421 p_sig
= &(*p_sig
)->prev
;
4423 signal
= (*p_sig
)->signal
;
4424 if ((*p_sig
)->info
.si_signo
!= 0)
4425 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4433 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4434 lwpid_of (thread
), step
? "step" : "continue", signal
,
4435 lwp
->stop_expected
? "expected" : "not expected");
4437 if (the_low_target
.prepare_to_resume
!= NULL
)
4438 the_low_target
.prepare_to_resume (lwp
);
4440 regcache_invalidate_thread (thread
);
4442 lwp
->stepping
= step
;
4444 ptrace_request
= PTRACE_SINGLESTEP
;
4445 else if (gdb_catching_syscalls_p (lwp
))
4446 ptrace_request
= PTRACE_SYSCALL
;
4448 ptrace_request
= PTRACE_CONT
;
4449 ptrace (ptrace_request
,
4451 (PTRACE_TYPE_ARG3
) 0,
4452 /* Coerce to a uintptr_t first to avoid potential gcc warning
4453 of coercing an 8 byte integer to a 4 byte pointer. */
4454 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4456 current_thread
= saved_thread
;
4458 perror_with_name ("resuming thread");
4460 /* Successfully resumed. Clear state that no longer makes sense,
4461 and mark the LWP as running. Must not do this before resuming
4462 otherwise if that fails other code will be confused. E.g., we'd
4463 later try to stop the LWP and hang forever waiting for a stop
4464 status. Note that we must not throw after this is cleared,
4465 otherwise handle_zombie_lwp_error would get confused. */
4467 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4470 /* Called when we try to resume a stopped LWP and that errors out. If
4471 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4472 or about to become), discard the error, clear any pending status
4473 the LWP may have, and return true (we'll collect the exit status
4474 soon enough). Otherwise, return false. */
4477 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4479 struct thread_info
*thread
= get_lwp_thread (lp
);
4481 /* If we get an error after resuming the LWP successfully, we'd
4482 confuse !T state for the LWP being gone. */
4483 gdb_assert (lp
->stopped
);
4485 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4486 because even if ptrace failed with ESRCH, the tracee may be "not
4487 yet fully dead", but already refusing ptrace requests. In that
4488 case the tracee has 'R (Running)' state for a little bit
4489 (observed in Linux 3.18). See also the note on ESRCH in the
4490 ptrace(2) man page. Instead, check whether the LWP has any state
4491 other than ptrace-stopped. */
4493 /* Don't assume anything if /proc/PID/status can't be read. */
4494 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4496 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4497 lp
->status_pending_p
= 0;
4503 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4504 disappears while we try to resume it. */
4507 linux_resume_one_lwp (struct lwp_info
*lwp
,
4508 int step
, int signal
, siginfo_t
*info
)
4512 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4514 CATCH (ex
, RETURN_MASK_ERROR
)
4516 if (!check_ptrace_stopped_lwp_gone (lwp
))
4517 throw_exception (ex
);
4522 /* This function is called once per thread via for_each_thread.
4523 We look up which resume request applies to THREAD and mark it with a
4524 pointer to the appropriate resume request.
4526 This algorithm is O(threads * resume elements), but resume elements
4527 is small (and will remain small at least until GDB supports thread
4531 linux_set_resume_request (thread_info
*thread
, thread_resume
*resume
, size_t n
)
4533 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4535 for (int ndx
= 0; ndx
< n
; ndx
++)
4537 ptid_t ptid
= resume
[ndx
].thread
;
4538 if (ptid_equal (ptid
, minus_one_ptid
)
4539 || ptid
== thread
->id
4540 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4542 || (ptid_get_pid (ptid
) == pid_of (thread
)
4543 && (ptid_is_pid (ptid
)
4544 || ptid_get_lwp (ptid
) == -1)))
4546 if (resume
[ndx
].kind
== resume_stop
4547 && thread
->last_resume_kind
== resume_stop
)
4550 debug_printf ("already %s LWP %ld at GDB's request\n",
4551 (thread
->last_status
.kind
4552 == TARGET_WAITKIND_STOPPED
)
4560 /* Ignore (wildcard) resume requests for already-resumed
4562 if (resume
[ndx
].kind
!= resume_stop
4563 && thread
->last_resume_kind
!= resume_stop
)
4566 debug_printf ("already %s LWP %ld at GDB's request\n",
4567 (thread
->last_resume_kind
4575 /* Don't let wildcard resumes resume fork children that GDB
4576 does not yet know are new fork children. */
4577 if (lwp
->fork_relative
!= NULL
)
4579 struct lwp_info
*rel
= lwp
->fork_relative
;
4581 if (rel
->status_pending_p
4582 && (rel
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
4583 || rel
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
))
4586 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4592 /* If the thread has a pending event that has already been
4593 reported to GDBserver core, but GDB has not pulled the
4594 event out of the vStopped queue yet, likewise, ignore the
4595 (wildcard) resume request. */
4596 if (in_queued_stop_replies (thread
->id
))
4599 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4604 lwp
->resume
= &resume
[ndx
];
4605 thread
->last_resume_kind
= lwp
->resume
->kind
;
4607 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4608 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4610 /* If we had a deferred signal to report, dequeue one now.
4611 This can happen if LWP gets more than one signal while
4612 trying to get out of a jump pad. */
4614 && !lwp
->status_pending_p
4615 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4617 lwp
->status_pending_p
= 1;
4620 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4621 "leaving status pending.\n",
4622 WSTOPSIG (lwp
->status_pending
),
4630 /* No resume action for this thread. */
4634 /* find_thread callback for linux_resume. Return true if this lwp has an
4635 interesting status pending. */
4638 resume_status_pending_p (thread_info
*thread
)
4640 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4642 /* LWPs which will not be resumed are not interesting, because
4643 we might not wait for them next time through linux_wait. */
4644 if (lwp
->resume
== NULL
)
4647 return thread_still_has_status_pending_p (thread
);
4650 /* Return 1 if this lwp that GDB wants running is stopped at an
4651 internal breakpoint that we need to step over. It assumes that any
4652 required STOP_PC adjustment has already been propagated to the
4653 inferior's regcache. */
4656 need_step_over_p (thread_info
*thread
)
4658 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4659 struct thread_info
*saved_thread
;
4661 struct process_info
*proc
= get_thread_process (thread
);
4663 /* GDBserver is skipping the extra traps from the wrapper program,
4664 don't have to do step over. */
4665 if (proc
->tdesc
== NULL
)
4668 /* LWPs which will not be resumed are not interesting, because we
4669 might not wait for them next time through linux_wait. */
4674 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4679 if (thread
->last_resume_kind
== resume_stop
)
4682 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4688 gdb_assert (lwp
->suspended
>= 0);
4693 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4698 if (lwp
->status_pending_p
)
4701 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4707 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4711 /* If the PC has changed since we stopped, then don't do anything,
4712 and let the breakpoint/tracepoint be hit. This happens if, for
4713 instance, GDB handled the decr_pc_after_break subtraction itself,
4714 GDB is OOL stepping this thread, or the user has issued a "jump"
4715 command, or poked thread's registers herself. */
4716 if (pc
!= lwp
->stop_pc
)
4719 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4720 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4722 paddress (lwp
->stop_pc
), paddress (pc
));
4726 /* On software single step target, resume the inferior with signal
4727 rather than stepping over. */
4728 if (can_software_single_step ()
4729 && lwp
->pending_signals
!= NULL
4730 && lwp_signal_can_be_delivered (lwp
))
4733 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4740 saved_thread
= current_thread
;
4741 current_thread
= thread
;
4743 /* We can only step over breakpoints we know about. */
4744 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4746 /* Don't step over a breakpoint that GDB expects to hit
4747 though. If the condition is being evaluated on the target's side
4748 and it evaluate to false, step over this breakpoint as well. */
4749 if (gdb_breakpoint_here (pc
)
4750 && gdb_condition_true_at_breakpoint (pc
)
4751 && gdb_no_commands_at_breakpoint (pc
))
4754 debug_printf ("Need step over [LWP %ld]? yes, but found"
4755 " GDB breakpoint at 0x%s; skipping step over\n",
4756 lwpid_of (thread
), paddress (pc
));
4758 current_thread
= saved_thread
;
4764 debug_printf ("Need step over [LWP %ld]? yes, "
4765 "found breakpoint at 0x%s\n",
4766 lwpid_of (thread
), paddress (pc
));
4768 /* We've found an lwp that needs stepping over --- return 1 so
4769 that find_thread stops looking. */
4770 current_thread
= saved_thread
;
4776 current_thread
= saved_thread
;
4779 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4781 lwpid_of (thread
), paddress (pc
));
4786 /* Start a step-over operation on LWP. When LWP stopped at a
4787 breakpoint, to make progress, we need to remove the breakpoint out
4788 of the way. If we let other threads run while we do that, they may
4789 pass by the breakpoint location and miss hitting it. To avoid
4790 that, a step-over momentarily stops all threads while LWP is
4791 single-stepped by either hardware or software while the breakpoint
4792 is temporarily uninserted from the inferior. When the single-step
4793 finishes, we reinsert the breakpoint, and let all threads that are
4794 supposed to be running, run again. */
4797 start_step_over (struct lwp_info
*lwp
)
4799 struct thread_info
*thread
= get_lwp_thread (lwp
);
4800 struct thread_info
*saved_thread
;
4805 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4808 stop_all_lwps (1, lwp
);
4810 if (lwp
->suspended
!= 0)
4812 internal_error (__FILE__
, __LINE__
,
4813 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4818 debug_printf ("Done stopping all threads for step-over.\n");
4820 /* Note, we should always reach here with an already adjusted PC,
4821 either by GDB (if we're resuming due to GDB's request), or by our
4822 caller, if we just finished handling an internal breakpoint GDB
4823 shouldn't care about. */
4826 saved_thread
= current_thread
;
4827 current_thread
= thread
;
4829 lwp
->bp_reinsert
= pc
;
4830 uninsert_breakpoints_at (pc
);
4831 uninsert_fast_tracepoint_jumps_at (pc
);
4833 step
= single_step (lwp
);
4835 current_thread
= saved_thread
;
4837 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4839 /* Require next event from this LWP. */
4840 step_over_bkpt
= thread
->id
;
4844 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4845 start_step_over, if still there, and delete any single-step
4846 breakpoints we've set, on non hardware single-step targets. */
4849 finish_step_over (struct lwp_info
*lwp
)
4851 if (lwp
->bp_reinsert
!= 0)
4853 struct thread_info
*saved_thread
= current_thread
;
4856 debug_printf ("Finished step over.\n");
4858 current_thread
= get_lwp_thread (lwp
);
4860 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4861 may be no breakpoint to reinsert there by now. */
4862 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4863 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4865 lwp
->bp_reinsert
= 0;
4867 /* Delete any single-step breakpoints. No longer needed. We
4868 don't have to worry about other threads hitting this trap,
4869 and later not being able to explain it, because we were
4870 stepping over a breakpoint, and we hold all threads but
4871 LWP stopped while doing that. */
4872 if (!can_hardware_single_step ())
4874 gdb_assert (has_single_step_breakpoints (current_thread
));
4875 delete_single_step_breakpoints (current_thread
);
4878 step_over_bkpt
= null_ptid
;
4879 current_thread
= saved_thread
;
4886 /* If there's a step over in progress, wait until all threads stop
4887 (that is, until the stepping thread finishes its step), and
4888 unsuspend all lwps. The stepping thread ends with its status
4889 pending, which is processed later when we get back to processing
4893 complete_ongoing_step_over (void)
4895 if (!ptid_equal (step_over_bkpt
, null_ptid
))
4897 struct lwp_info
*lwp
;
4902 debug_printf ("detach: step over in progress, finish it first\n");
4904 /* Passing NULL_PTID as filter indicates we want all events to
4905 be left pending. Eventually this returns when there are no
4906 unwaited-for children left. */
4907 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4909 gdb_assert (ret
== -1);
4911 lwp
= find_lwp_pid (step_over_bkpt
);
4913 finish_step_over (lwp
);
4914 step_over_bkpt
= null_ptid
;
4915 unsuspend_all_lwps (lwp
);
4919 /* This function is called once per thread. We check the thread's resume
4920 request, which will tell us whether to resume, step, or leave the thread
4921 stopped; and what signal, if any, it should be sent.
4923 For threads which we aren't explicitly told otherwise, we preserve
4924 the stepping flag; this is used for stepping over gdbserver-placed
4927 If pending_flags was set in any thread, we queue any needed
4928 signals, since we won't actually resume. We already have a pending
4929 event to report, so we don't need to preserve any step requests;
4930 they should be re-issued if necessary. */
4933 linux_resume_one_thread (thread_info
*thread
, bool leave_all_stopped
)
4935 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4938 if (lwp
->resume
== NULL
)
4941 if (lwp
->resume
->kind
== resume_stop
)
4944 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4949 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
4951 /* Stop the thread, and wait for the event asynchronously,
4952 through the event loop. */
4958 debug_printf ("already stopped LWP %ld\n",
4961 /* The LWP may have been stopped in an internal event that
4962 was not meant to be notified back to GDB (e.g., gdbserver
4963 breakpoint), so we should be reporting a stop event in
4966 /* If the thread already has a pending SIGSTOP, this is a
4967 no-op. Otherwise, something later will presumably resume
4968 the thread and this will cause it to cancel any pending
4969 operation, due to last_resume_kind == resume_stop. If
4970 the thread already has a pending status to report, we
4971 will still report it the next time we wait - see
4972 status_pending_p_callback. */
4974 /* If we already have a pending signal to report, then
4975 there's no need to queue a SIGSTOP, as this means we're
4976 midway through moving the LWP out of the jumppad, and we
4977 will report the pending signal as soon as that is
4979 if (lwp
->pending_signals_to_report
== NULL
)
4983 /* For stop requests, we're done. */
4985 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4989 /* If this thread which is about to be resumed has a pending status,
4990 then don't resume it - we can just report the pending status.
4991 Likewise if it is suspended, because e.g., another thread is
4992 stepping past a breakpoint. Make sure to queue any signals that
4993 would otherwise be sent. In all-stop mode, we do this decision
4994 based on if *any* thread has a pending status. If there's a
4995 thread that needs the step-over-breakpoint dance, then don't
4996 resume any other thread but that particular one. */
4997 leave_pending
= (lwp
->suspended
4998 || lwp
->status_pending_p
4999 || leave_all_stopped
);
5001 /* If we have a new signal, enqueue the signal. */
5002 if (lwp
->resume
->sig
!= 0)
5004 siginfo_t info
, *info_p
;
5006 /* If this is the same signal we were previously stopped by,
5007 make sure to queue its siginfo. */
5008 if (WIFSTOPPED (lwp
->last_status
)
5009 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
5010 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
5011 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
5016 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
5022 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
5024 proceed_one_lwp (thread
, NULL
);
5029 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5032 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5037 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5039 struct thread_info
*need_step_over
= NULL
;
5044 debug_printf ("linux_resume:\n");
5047 for_each_thread ([&] (thread_info
*thread
)
5049 linux_set_resume_request (thread
, resume_info
, n
);
5052 /* If there is a thread which would otherwise be resumed, which has
5053 a pending status, then don't resume any threads - we can just
5054 report the pending status. Make sure to queue any signals that
5055 would otherwise be sent. In non-stop mode, we'll apply this
5056 logic to each thread individually. We consume all pending events
5057 before considering to start a step-over (in all-stop). */
5058 bool any_pending
= false;
5060 any_pending
= find_thread (resume_status_pending_p
) != NULL
;
5062 /* If there is a thread which would otherwise be resumed, which is
5063 stopped at a breakpoint that needs stepping over, then don't
5064 resume any threads - have it step over the breakpoint with all
5065 other threads stopped, then resume all threads again. Make sure
5066 to queue any signals that would otherwise be delivered or
5068 if (!any_pending
&& supports_breakpoints ())
5069 need_step_over
= find_thread (need_step_over_p
);
5071 bool leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5075 if (need_step_over
!= NULL
)
5076 debug_printf ("Not resuming all, need step over\n");
5077 else if (any_pending
)
5078 debug_printf ("Not resuming, all-stop and found "
5079 "an LWP with pending status\n");
5081 debug_printf ("Resuming, no pending status or step over needed\n");
5084 /* Even if we're leaving threads stopped, queue all signals we'd
5085 otherwise deliver. */
5086 for_each_thread ([&] (thread_info
*thread
)
5088 linux_resume_one_thread (thread
, leave_all_stopped
);
5092 start_step_over (get_thread_lwp (need_step_over
));
5096 debug_printf ("linux_resume done\n");
5100 /* We may have events that were pending that can/should be sent to
5101 the client now. Trigger a linux_wait call. */
5102 if (target_is_async_p ())
5106 /* This function is called once per thread. We check the thread's
5107 last resume request, which will tell us whether to resume, step, or
5108 leave the thread stopped. Any signal the client requested to be
5109 delivered has already been enqueued at this point.
5111 If any thread that GDB wants running is stopped at an internal
5112 breakpoint that needs stepping over, we start a step-over operation
5113 on that particular thread, and leave all others stopped. */
5116 proceed_one_lwp (thread_info
*thread
, lwp_info
*except
)
5118 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5125 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5130 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5134 if (thread
->last_resume_kind
== resume_stop
5135 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5138 debug_printf (" client wants LWP to remain %ld stopped\n",
5143 if (lwp
->status_pending_p
)
5146 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5151 gdb_assert (lwp
->suspended
>= 0);
5156 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5160 if (thread
->last_resume_kind
== resume_stop
5161 && lwp
->pending_signals_to_report
== NULL
5162 && (lwp
->collecting_fast_tracepoint
5163 == fast_tpoint_collect_result::not_collecting
))
5165 /* We haven't reported this LWP as stopped yet (otherwise, the
5166 last_status.kind check above would catch it, and we wouldn't
5167 reach here. This LWP may have been momentarily paused by a
5168 stop_all_lwps call while handling for example, another LWP's
5169 step-over. In that case, the pending expected SIGSTOP signal
5170 that was queued at vCont;t handling time will have already
5171 been consumed by wait_for_sigstop, and so we need to requeue
5172 another one here. Note that if the LWP already has a SIGSTOP
5173 pending, this is a no-op. */
5176 debug_printf ("Client wants LWP %ld to stop. "
5177 "Making sure it has a SIGSTOP pending\n",
5183 if (thread
->last_resume_kind
== resume_step
)
5186 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5189 /* If resume_step is requested by GDB, install single-step
5190 breakpoints when the thread is about to be actually resumed if
5191 the single-step breakpoints weren't removed. */
5192 if (can_software_single_step ()
5193 && !has_single_step_breakpoints (thread
))
5194 install_software_single_step_breakpoints (lwp
);
5196 step
= maybe_hw_step (thread
);
5198 else if (lwp
->bp_reinsert
!= 0)
5201 debug_printf (" stepping LWP %ld, reinsert set\n",
5204 step
= maybe_hw_step (thread
);
5209 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5213 unsuspend_and_proceed_one_lwp (thread_info
*thread
, lwp_info
*except
)
5215 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5220 lwp_suspended_decr (lwp
);
5222 proceed_one_lwp (thread
, except
);
5225 /* When we finish a step-over, set threads running again. If there's
5226 another thread that may need a step-over, now's the time to start
5227 it. Eventually, we'll move all threads past their breakpoints. */
5230 proceed_all_lwps (void)
5232 struct thread_info
*need_step_over
;
5234 /* If there is a thread which would otherwise be resumed, which is
5235 stopped at a breakpoint that needs stepping over, then don't
5236 resume any threads - have it step over the breakpoint with all
5237 other threads stopped, then resume all threads again. */
5239 if (supports_breakpoints ())
5241 need_step_over
= find_thread (need_step_over_p
);
5243 if (need_step_over
!= NULL
)
5246 debug_printf ("proceed_all_lwps: found "
5247 "thread %ld needing a step-over\n",
5248 lwpid_of (need_step_over
));
5250 start_step_over (get_thread_lwp (need_step_over
));
5256 debug_printf ("Proceeding, no step-over needed\n");
5258 for_each_thread ([] (thread_info
*thread
)
5260 proceed_one_lwp (thread
, NULL
);
5264 /* Stopped LWPs that the client wanted to be running, that don't have
5265 pending statuses, are set to run again, except for EXCEPT, if not
5266 NULL. This undoes a stop_all_lwps call. */
5269 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5275 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5276 lwpid_of (get_lwp_thread (except
)));
5278 debug_printf ("unstopping all lwps\n");
5282 for_each_thread ([&] (thread_info
*thread
)
5284 unsuspend_and_proceed_one_lwp (thread
, except
);
5287 for_each_thread ([&] (thread_info
*thread
)
5289 proceed_one_lwp (thread
, except
);
5294 debug_printf ("unstop_all_lwps done\n");
5300 #ifdef HAVE_LINUX_REGSETS
5302 #define use_linux_regsets 1
5304 /* Returns true if REGSET has been disabled. */
5307 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5309 return (info
->disabled_regsets
!= NULL
5310 && info
->disabled_regsets
[regset
- info
->regsets
]);
5313 /* Disable REGSET. */
5316 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5320 dr_offset
= regset
- info
->regsets
;
5321 if (info
->disabled_regsets
== NULL
)
5322 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5323 info
->disabled_regsets
[dr_offset
] = 1;
5327 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5328 struct regcache
*regcache
)
5330 struct regset_info
*regset
;
5331 int saw_general_regs
= 0;
5335 pid
= lwpid_of (current_thread
);
5336 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5341 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5344 buf
= xmalloc (regset
->size
);
5346 nt_type
= regset
->nt_type
;
5350 iov
.iov_len
= regset
->size
;
5351 data
= (void *) &iov
;
5357 res
= ptrace (regset
->get_request
, pid
,
5358 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5360 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5366 /* If we get EIO on a regset, do not try it again for
5367 this process mode. */
5368 disable_regset (regsets_info
, regset
);
5370 else if (errno
== ENODATA
)
5372 /* ENODATA may be returned if the regset is currently
5373 not "active". This can happen in normal operation,
5374 so suppress the warning in this case. */
5376 else if (errno
== ESRCH
)
5378 /* At this point, ESRCH should mean the process is
5379 already gone, in which case we simply ignore attempts
5380 to read its registers. */
5385 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5392 if (regset
->type
== GENERAL_REGS
)
5393 saw_general_regs
= 1;
5394 regset
->store_function (regcache
, buf
);
5398 if (saw_general_regs
)
5405 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5406 struct regcache
*regcache
)
5408 struct regset_info
*regset
;
5409 int saw_general_regs
= 0;
5413 pid
= lwpid_of (current_thread
);
5414 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5419 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5420 || regset
->fill_function
== NULL
)
5423 buf
= xmalloc (regset
->size
);
5425 /* First fill the buffer with the current register set contents,
5426 in case there are any items in the kernel's regset that are
5427 not in gdbserver's regcache. */
5429 nt_type
= regset
->nt_type
;
5433 iov
.iov_len
= regset
->size
;
5434 data
= (void *) &iov
;
5440 res
= ptrace (regset
->get_request
, pid
,
5441 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5443 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5448 /* Then overlay our cached registers on that. */
5449 regset
->fill_function (regcache
, buf
);
5451 /* Only now do we write the register set. */
5453 res
= ptrace (regset
->set_request
, pid
,
5454 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5456 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5464 /* If we get EIO on a regset, do not try it again for
5465 this process mode. */
5466 disable_regset (regsets_info
, regset
);
5468 else if (errno
== ESRCH
)
5470 /* At this point, ESRCH should mean the process is
5471 already gone, in which case we simply ignore attempts
5472 to change its registers. See also the related
5473 comment in linux_resume_one_lwp. */
5479 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5482 else if (regset
->type
== GENERAL_REGS
)
5483 saw_general_regs
= 1;
5486 if (saw_general_regs
)
5492 #else /* !HAVE_LINUX_REGSETS */
5494 #define use_linux_regsets 0
5495 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5496 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5500 /* Return 1 if register REGNO is supported by one of the regset ptrace
5501 calls or 0 if it has to be transferred individually. */
5504 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5506 unsigned char mask
= 1 << (regno
% 8);
5507 size_t index
= regno
/ 8;
5509 return (use_linux_regsets
5510 && (regs_info
->regset_bitmap
== NULL
5511 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5514 #ifdef HAVE_LINUX_USRREGS
5517 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5521 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5522 error ("Invalid register number %d.", regnum
);
5524 addr
= usrregs
->regmap
[regnum
];
5529 /* Fetch one register. */
5531 fetch_register (const struct usrregs_info
*usrregs
,
5532 struct regcache
*regcache
, int regno
)
5539 if (regno
>= usrregs
->num_regs
)
5541 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5544 regaddr
= register_addr (usrregs
, regno
);
5548 size
= ((register_size (regcache
->tdesc
, regno
)
5549 + sizeof (PTRACE_XFER_TYPE
) - 1)
5550 & -sizeof (PTRACE_XFER_TYPE
));
5551 buf
= (char *) alloca (size
);
5553 pid
= lwpid_of (current_thread
);
5554 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5557 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5558 ptrace (PTRACE_PEEKUSER
, pid
,
5559 /* Coerce to a uintptr_t first to avoid potential gcc warning
5560 of coercing an 8 byte integer to a 4 byte pointer. */
5561 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5562 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5565 /* Mark register REGNO unavailable. */
5566 supply_register (regcache
, regno
, NULL
);
5571 if (the_low_target
.supply_ptrace_register
)
5572 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5574 supply_register (regcache
, regno
, buf
);
5577 /* Store one register. */
5579 store_register (const struct usrregs_info
*usrregs
,
5580 struct regcache
*regcache
, int regno
)
5587 if (regno
>= usrregs
->num_regs
)
5589 if ((*the_low_target
.cannot_store_register
) (regno
))
5592 regaddr
= register_addr (usrregs
, regno
);
5596 size
= ((register_size (regcache
->tdesc
, regno
)
5597 + sizeof (PTRACE_XFER_TYPE
) - 1)
5598 & -sizeof (PTRACE_XFER_TYPE
));
5599 buf
= (char *) alloca (size
);
5600 memset (buf
, 0, size
);
5602 if (the_low_target
.collect_ptrace_register
)
5603 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5605 collect_register (regcache
, regno
, buf
);
5607 pid
= lwpid_of (current_thread
);
5608 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5611 ptrace (PTRACE_POKEUSER
, pid
,
5612 /* Coerce to a uintptr_t first to avoid potential gcc warning
5613 about coercing an 8 byte integer to a 4 byte pointer. */
5614 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5615 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5618 /* At this point, ESRCH should mean the process is
5619 already gone, in which case we simply ignore attempts
5620 to change its registers. See also the related
5621 comment in linux_resume_one_lwp. */
5625 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5626 error ("writing register %d: %s", regno
, strerror (errno
));
5628 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5632 /* Fetch all registers, or just one, from the child process.
5633 If REGNO is -1, do this for all registers, skipping any that are
5634 assumed to have been retrieved by regsets_fetch_inferior_registers,
5635 unless ALL is non-zero.
5636 Otherwise, REGNO specifies which register (so we can save time). */
5638 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5639 struct regcache
*regcache
, int regno
, int all
)
5641 struct usrregs_info
*usr
= regs_info
->usrregs
;
5645 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5646 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5647 fetch_register (usr
, regcache
, regno
);
5650 fetch_register (usr
, regcache
, regno
);
5653 /* Store our register values back into the inferior.
5654 If REGNO is -1, do this for all registers, skipping any that are
5655 assumed to have been saved by regsets_store_inferior_registers,
5656 unless ALL is non-zero.
5657 Otherwise, REGNO specifies which register (so we can save time). */
5659 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5660 struct regcache
*regcache
, int regno
, int all
)
5662 struct usrregs_info
*usr
= regs_info
->usrregs
;
5666 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5667 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5668 store_register (usr
, regcache
, regno
);
5671 store_register (usr
, regcache
, regno
);
5674 #else /* !HAVE_LINUX_USRREGS */
5676 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5677 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5683 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5687 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5691 if (the_low_target
.fetch_register
!= NULL
5692 && regs_info
->usrregs
!= NULL
)
5693 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5694 (*the_low_target
.fetch_register
) (regcache
, regno
);
5696 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5697 if (regs_info
->usrregs
!= NULL
)
5698 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5702 if (the_low_target
.fetch_register
!= NULL
5703 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5706 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5708 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5710 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5711 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5716 linux_store_registers (struct regcache
*regcache
, int regno
)
5720 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5724 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5726 if (regs_info
->usrregs
!= NULL
)
5727 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5731 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5733 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5735 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5736 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5741 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5742 to debugger memory starting at MYADDR. */
5745 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5747 int pid
= lwpid_of (current_thread
);
5748 PTRACE_XFER_TYPE
*buffer
;
5756 /* Try using /proc. Don't bother for one word. */
5757 if (len
>= 3 * sizeof (long))
5761 /* We could keep this file open and cache it - possibly one per
5762 thread. That requires some juggling, but is even faster. */
5763 sprintf (filename
, "/proc/%d/mem", pid
);
5764 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5768 /* If pread64 is available, use it. It's faster if the kernel
5769 supports it (only one syscall), and it's 64-bit safe even on
5770 32-bit platforms (for instance, SPARC debugging a SPARC64
5773 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5776 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5777 bytes
= read (fd
, myaddr
, len
);
5784 /* Some data was read, we'll try to get the rest with ptrace. */
5794 /* Round starting address down to longword boundary. */
5795 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5796 /* Round ending address up; get number of longwords that makes. */
5797 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5798 / sizeof (PTRACE_XFER_TYPE
));
5799 /* Allocate buffer of that many longwords. */
5800 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5802 /* Read all the longwords */
5804 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5806 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5807 about coercing an 8 byte integer to a 4 byte pointer. */
5808 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5809 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5810 (PTRACE_TYPE_ARG4
) 0);
5816 /* Copy appropriate bytes out of the buffer. */
5819 i
*= sizeof (PTRACE_XFER_TYPE
);
5820 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5822 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5829 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5830 memory at MEMADDR. On failure (cannot write to the inferior)
5831 returns the value of errno. Always succeeds if LEN is zero. */
5834 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5837 /* Round starting address down to longword boundary. */
5838 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5839 /* Round ending address up; get number of longwords that makes. */
5841 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5842 / sizeof (PTRACE_XFER_TYPE
);
5844 /* Allocate buffer of that many longwords. */
5845 PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5847 int pid
= lwpid_of (current_thread
);
5851 /* Zero length write always succeeds. */
5857 /* Dump up to four bytes. */
5858 char str
[4 * 2 + 1];
5860 int dump
= len
< 4 ? len
: 4;
5862 for (i
= 0; i
< dump
; i
++)
5864 sprintf (p
, "%02x", myaddr
[i
]);
5869 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5870 str
, (long) memaddr
, pid
);
5873 /* Fill start and end extra bytes of buffer with existing memory data. */
5876 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5877 about coercing an 8 byte integer to a 4 byte pointer. */
5878 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5879 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5880 (PTRACE_TYPE_ARG4
) 0);
5888 = ptrace (PTRACE_PEEKTEXT
, pid
,
5889 /* Coerce to a uintptr_t first to avoid potential gcc warning
5890 about coercing an 8 byte integer to a 4 byte pointer. */
5891 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5892 * sizeof (PTRACE_XFER_TYPE
)),
5893 (PTRACE_TYPE_ARG4
) 0);
5898 /* Copy data to be written over corresponding part of buffer. */
5900 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5903 /* Write the entire buffer. */
5905 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5908 ptrace (PTRACE_POKETEXT
, pid
,
5909 /* Coerce to a uintptr_t first to avoid potential gcc warning
5910 about coercing an 8 byte integer to a 4 byte pointer. */
5911 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5912 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5921 linux_look_up_symbols (void)
5923 #ifdef USE_THREAD_DB
5924 struct process_info
*proc
= current_process ();
5926 if (proc
->priv
->thread_db
!= NULL
)
5934 linux_request_interrupt (void)
5936 /* Send a SIGINT to the process group. This acts just like the user
5937 typed a ^C on the controlling terminal. */
5938 kill (-signal_pid
, SIGINT
);
5941 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5942 to debugger memory starting at MYADDR. */
5945 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5947 char filename
[PATH_MAX
];
5949 int pid
= lwpid_of (current_thread
);
5951 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5953 fd
= open (filename
, O_RDONLY
);
5957 if (offset
!= (CORE_ADDR
) 0
5958 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5961 n
= read (fd
, myaddr
, len
);
5968 /* These breakpoint and watchpoint related wrapper functions simply
5969 pass on the function call if the target has registered a
5970 corresponding function. */
5973 linux_supports_z_point_type (char z_type
)
5975 return (the_low_target
.supports_z_point_type
!= NULL
5976 && the_low_target
.supports_z_point_type (z_type
));
5980 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5981 int size
, struct raw_breakpoint
*bp
)
5983 if (type
== raw_bkpt_type_sw
)
5984 return insert_memory_breakpoint (bp
);
5985 else if (the_low_target
.insert_point
!= NULL
)
5986 return the_low_target
.insert_point (type
, addr
, size
, bp
);
5988 /* Unsupported (see target.h). */
5993 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5994 int size
, struct raw_breakpoint
*bp
)
5996 if (type
== raw_bkpt_type_sw
)
5997 return remove_memory_breakpoint (bp
);
5998 else if (the_low_target
.remove_point
!= NULL
)
5999 return the_low_target
.remove_point (type
, addr
, size
, bp
);
6001 /* Unsupported (see target.h). */
6005 /* Implement the to_stopped_by_sw_breakpoint target_ops
6009 linux_stopped_by_sw_breakpoint (void)
6011 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6013 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
6016 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
6020 linux_supports_stopped_by_sw_breakpoint (void)
6022 return USE_SIGTRAP_SIGINFO
;
6025 /* Implement the to_stopped_by_hw_breakpoint target_ops
6029 linux_stopped_by_hw_breakpoint (void)
6031 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6033 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6036 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6040 linux_supports_stopped_by_hw_breakpoint (void)
6042 return USE_SIGTRAP_SIGINFO
;
6045 /* Implement the supports_hardware_single_step target_ops method. */
6048 linux_supports_hardware_single_step (void)
6050 return can_hardware_single_step ();
6054 linux_supports_software_single_step (void)
6056 return can_software_single_step ();
6060 linux_stopped_by_watchpoint (void)
6062 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6064 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6068 linux_stopped_data_address (void)
6070 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6072 return lwp
->stopped_data_address
;
6075 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6076 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6077 && defined(PT_TEXT_END_ADDR)
6079 /* This is only used for targets that define PT_TEXT_ADDR,
6080 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6081 the target has different ways of acquiring this information, like
6084 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6085 to tell gdb about. */
6088 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6090 unsigned long text
, text_end
, data
;
6091 int pid
= lwpid_of (current_thread
);
6095 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6096 (PTRACE_TYPE_ARG4
) 0);
6097 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6098 (PTRACE_TYPE_ARG4
) 0);
6099 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6100 (PTRACE_TYPE_ARG4
) 0);
6104 /* Both text and data offsets produced at compile-time (and so
6105 used by gdb) are relative to the beginning of the program,
6106 with the data segment immediately following the text segment.
6107 However, the actual runtime layout in memory may put the data
6108 somewhere else, so when we send gdb a data base-address, we
6109 use the real data base address and subtract the compile-time
6110 data base-address from it (which is just the length of the
6111 text segment). BSS immediately follows data in both
6114 *data_p
= data
- (text_end
- text
);
6123 linux_qxfer_osdata (const char *annex
,
6124 unsigned char *readbuf
, unsigned const char *writebuf
,
6125 CORE_ADDR offset
, int len
)
6127 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6130 /* Convert a native/host siginfo object, into/from the siginfo in the
6131 layout of the inferiors' architecture. */
6134 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6138 if (the_low_target
.siginfo_fixup
!= NULL
)
6139 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6141 /* If there was no callback, or the callback didn't do anything,
6142 then just do a straight memcpy. */
6146 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6148 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6153 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6154 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6158 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6160 if (current_thread
== NULL
)
6163 pid
= lwpid_of (current_thread
);
6166 debug_printf ("%s siginfo for lwp %d.\n",
6167 readbuf
!= NULL
? "Reading" : "Writing",
6170 if (offset
>= sizeof (siginfo
))
6173 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6176 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6177 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6178 inferior with a 64-bit GDBSERVER should look the same as debugging it
6179 with a 32-bit GDBSERVER, we need to convert it. */
6180 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6182 if (offset
+ len
> sizeof (siginfo
))
6183 len
= sizeof (siginfo
) - offset
;
6185 if (readbuf
!= NULL
)
6186 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6189 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6191 /* Convert back to ptrace layout before flushing it out. */
6192 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6194 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6201 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6202 so we notice when children change state; as the handler for the
6203 sigsuspend in my_waitpid. */
6206 sigchld_handler (int signo
)
6208 int old_errno
= errno
;
6214 /* fprintf is not async-signal-safe, so call write
6216 if (write (2, "sigchld_handler\n",
6217 sizeof ("sigchld_handler\n") - 1) < 0)
6218 break; /* just ignore */
6222 if (target_is_async_p ())
6223 async_file_mark (); /* trigger a linux_wait */
6229 linux_supports_non_stop (void)
6235 linux_async (int enable
)
6237 int previous
= target_is_async_p ();
6240 debug_printf ("linux_async (%d), previous=%d\n",
6243 if (previous
!= enable
)
6246 sigemptyset (&mask
);
6247 sigaddset (&mask
, SIGCHLD
);
6249 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6253 if (pipe (linux_event_pipe
) == -1)
6255 linux_event_pipe
[0] = -1;
6256 linux_event_pipe
[1] = -1;
6257 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6259 warning ("creating event pipe failed.");
6263 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6264 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6266 /* Register the event loop handler. */
6267 add_file_handler (linux_event_pipe
[0],
6268 handle_target_event
, NULL
);
6270 /* Always trigger a linux_wait. */
6275 delete_file_handler (linux_event_pipe
[0]);
6277 close (linux_event_pipe
[0]);
6278 close (linux_event_pipe
[1]);
6279 linux_event_pipe
[0] = -1;
6280 linux_event_pipe
[1] = -1;
6283 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6290 linux_start_non_stop (int nonstop
)
6292 /* Register or unregister from event-loop accordingly. */
6293 linux_async (nonstop
);
6295 if (target_is_async_p () != (nonstop
!= 0))
6302 linux_supports_multi_process (void)
6307 /* Check if fork events are supported. */
6310 linux_supports_fork_events (void)
6312 return linux_supports_tracefork ();
6315 /* Check if vfork events are supported. */
6318 linux_supports_vfork_events (void)
6320 return linux_supports_tracefork ();
6323 /* Check if exec events are supported. */
6326 linux_supports_exec_events (void)
6328 return linux_supports_traceexec ();
6331 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6332 ptrace flags for all inferiors. This is in case the new GDB connection
6333 doesn't support the same set of events that the previous one did. */
6336 linux_handle_new_gdb_connection (void)
6338 /* Request that all the lwps reset their ptrace options. */
6339 for_each_thread ([] (thread_info
*thread
)
6341 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6345 /* Stop the lwp so we can modify its ptrace options. */
6346 lwp
->must_set_ptrace_flags
= 1;
6347 linux_stop_lwp (lwp
);
6351 /* Already stopped; go ahead and set the ptrace options. */
6352 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6353 int options
= linux_low_ptrace_options (proc
->attached
);
6355 linux_enable_event_reporting (lwpid_of (thread
), options
);
6356 lwp
->must_set_ptrace_flags
= 0;
6362 linux_supports_disable_randomization (void)
6364 #ifdef HAVE_PERSONALITY
6372 linux_supports_agent (void)
6378 linux_supports_range_stepping (void)
6380 if (can_software_single_step ())
6382 if (*the_low_target
.supports_range_stepping
== NULL
)
6385 return (*the_low_target
.supports_range_stepping
) ();
6388 /* Enumerate spufs IDs for process PID. */
6390 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6396 struct dirent
*entry
;
6398 sprintf (path
, "/proc/%ld/fd", pid
);
6399 dir
= opendir (path
);
6404 while ((entry
= readdir (dir
)) != NULL
)
6410 fd
= atoi (entry
->d_name
);
6414 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6415 if (stat (path
, &st
) != 0)
6417 if (!S_ISDIR (st
.st_mode
))
6420 if (statfs (path
, &stfs
) != 0)
6422 if (stfs
.f_type
!= SPUFS_MAGIC
)
6425 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6427 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6437 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6438 object type, using the /proc file system. */
6440 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6441 unsigned const char *writebuf
,
6442 CORE_ADDR offset
, int len
)
6444 long pid
= lwpid_of (current_thread
);
6449 if (!writebuf
&& !readbuf
)
6457 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6460 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6461 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6466 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6473 ret
= write (fd
, writebuf
, (size_t) len
);
6475 ret
= read (fd
, readbuf
, (size_t) len
);
6481 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6482 struct target_loadseg
6484 /* Core address to which the segment is mapped. */
6486 /* VMA recorded in the program header. */
6488 /* Size of this segment in memory. */
6492 # if defined PT_GETDSBT
6493 struct target_loadmap
6495 /* Protocol version number, must be zero. */
6497 /* Pointer to the DSBT table, its size, and the DSBT index. */
6498 unsigned *dsbt_table
;
6499 unsigned dsbt_size
, dsbt_index
;
6500 /* Number of segments in this map. */
6502 /* The actual memory map. */
6503 struct target_loadseg segs
[/*nsegs*/];
6505 # define LINUX_LOADMAP PT_GETDSBT
6506 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6507 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6509 struct target_loadmap
6511 /* Protocol version number, must be zero. */
6513 /* Number of segments in this map. */
6515 /* The actual memory map. */
6516 struct target_loadseg segs
[/*nsegs*/];
6518 # define LINUX_LOADMAP PTRACE_GETFDPIC
6519 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6520 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6524 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6525 unsigned char *myaddr
, unsigned int len
)
6527 int pid
= lwpid_of (current_thread
);
6529 struct target_loadmap
*data
= NULL
;
6530 unsigned int actual_length
, copy_length
;
6532 if (strcmp (annex
, "exec") == 0)
6533 addr
= (int) LINUX_LOADMAP_EXEC
;
6534 else if (strcmp (annex
, "interp") == 0)
6535 addr
= (int) LINUX_LOADMAP_INTERP
;
6539 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6545 actual_length
= sizeof (struct target_loadmap
)
6546 + sizeof (struct target_loadseg
) * data
->nsegs
;
6548 if (offset
< 0 || offset
> actual_length
)
6551 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6552 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6556 # define linux_read_loadmap NULL
6557 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6560 linux_process_qsupported (char **features
, int count
)
6562 if (the_low_target
.process_qsupported
!= NULL
)
6563 the_low_target
.process_qsupported (features
, count
);
6567 linux_supports_catch_syscall (void)
6569 return (the_low_target
.get_syscall_trapinfo
!= NULL
6570 && linux_supports_tracesysgood ());
6574 linux_get_ipa_tdesc_idx (void)
6576 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6579 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6583 linux_supports_tracepoints (void)
6585 if (*the_low_target
.supports_tracepoints
== NULL
)
6588 return (*the_low_target
.supports_tracepoints
) ();
6592 linux_read_pc (struct regcache
*regcache
)
6594 if (the_low_target
.get_pc
== NULL
)
6597 return (*the_low_target
.get_pc
) (regcache
);
6601 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6603 gdb_assert (the_low_target
.set_pc
!= NULL
);
6605 (*the_low_target
.set_pc
) (regcache
, pc
);
6609 linux_thread_stopped (struct thread_info
*thread
)
6611 return get_thread_lwp (thread
)->stopped
;
6614 /* This exposes stop-all-threads functionality to other modules. */
6617 linux_pause_all (int freeze
)
6619 stop_all_lwps (freeze
, NULL
);
6622 /* This exposes unstop-all-threads functionality to other gdbserver
6626 linux_unpause_all (int unfreeze
)
6628 unstop_all_lwps (unfreeze
, NULL
);
6632 linux_prepare_to_access_memory (void)
6634 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6637 linux_pause_all (1);
6642 linux_done_accessing_memory (void)
6644 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6647 linux_unpause_all (1);
6651 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6652 CORE_ADDR collector
,
6655 CORE_ADDR
*jump_entry
,
6656 CORE_ADDR
*trampoline
,
6657 ULONGEST
*trampoline_size
,
6658 unsigned char *jjump_pad_insn
,
6659 ULONGEST
*jjump_pad_insn_size
,
6660 CORE_ADDR
*adjusted_insn_addr
,
6661 CORE_ADDR
*adjusted_insn_addr_end
,
6664 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6665 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6666 jump_entry
, trampoline
, trampoline_size
,
6667 jjump_pad_insn
, jjump_pad_insn_size
,
6668 adjusted_insn_addr
, adjusted_insn_addr_end
,
6672 static struct emit_ops
*
6673 linux_emit_ops (void)
6675 if (the_low_target
.emit_ops
!= NULL
)
6676 return (*the_low_target
.emit_ops
) ();
6682 linux_get_min_fast_tracepoint_insn_len (void)
6684 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6687 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6690 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6691 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6693 char filename
[PATH_MAX
];
6695 const int auxv_size
= is_elf64
6696 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6697 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6699 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6701 fd
= open (filename
, O_RDONLY
);
6707 while (read (fd
, buf
, auxv_size
) == auxv_size
6708 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6712 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6714 switch (aux
->a_type
)
6717 *phdr_memaddr
= aux
->a_un
.a_val
;
6720 *num_phdr
= aux
->a_un
.a_val
;
6726 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6728 switch (aux
->a_type
)
6731 *phdr_memaddr
= aux
->a_un
.a_val
;
6734 *num_phdr
= aux
->a_un
.a_val
;
6742 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6744 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6745 "phdr_memaddr = %ld, phdr_num = %d",
6746 (long) *phdr_memaddr
, *num_phdr
);
6753 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6756 get_dynamic (const int pid
, const int is_elf64
)
6758 CORE_ADDR phdr_memaddr
, relocation
;
6760 unsigned char *phdr_buf
;
6761 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6763 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6766 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6767 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6769 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6772 /* Compute relocation: it is expected to be 0 for "regular" executables,
6773 non-zero for PIE ones. */
6775 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6778 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6780 if (p
->p_type
== PT_PHDR
)
6781 relocation
= phdr_memaddr
- p
->p_vaddr
;
6785 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6787 if (p
->p_type
== PT_PHDR
)
6788 relocation
= phdr_memaddr
- p
->p_vaddr
;
6791 if (relocation
== -1)
6793 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6794 any real world executables, including PIE executables, have always
6795 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6796 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6797 or present DT_DEBUG anyway (fpc binaries are statically linked).
6799 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6801 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6806 for (i
= 0; i
< num_phdr
; i
++)
6810 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6812 if (p
->p_type
== PT_DYNAMIC
)
6813 return p
->p_vaddr
+ relocation
;
6817 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6819 if (p
->p_type
== PT_DYNAMIC
)
6820 return p
->p_vaddr
+ relocation
;
6827 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6828 can be 0 if the inferior does not yet have the library list initialized.
6829 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6830 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6833 get_r_debug (const int pid
, const int is_elf64
)
6835 CORE_ADDR dynamic_memaddr
;
6836 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6837 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6840 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6841 if (dynamic_memaddr
== 0)
6844 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6848 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6849 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6853 unsigned char buf
[sizeof (Elf64_Xword
)];
6857 #ifdef DT_MIPS_RLD_MAP
6858 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6860 if (linux_read_memory (dyn
->d_un
.d_val
,
6861 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6866 #endif /* DT_MIPS_RLD_MAP */
6867 #ifdef DT_MIPS_RLD_MAP_REL
6868 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6870 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6871 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6876 #endif /* DT_MIPS_RLD_MAP_REL */
6878 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6879 map
= dyn
->d_un
.d_val
;
6881 if (dyn
->d_tag
== DT_NULL
)
6886 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6887 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6891 unsigned char buf
[sizeof (Elf32_Word
)];
6895 #ifdef DT_MIPS_RLD_MAP
6896 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6898 if (linux_read_memory (dyn
->d_un
.d_val
,
6899 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6904 #endif /* DT_MIPS_RLD_MAP */
6905 #ifdef DT_MIPS_RLD_MAP_REL
6906 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6908 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6909 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6914 #endif /* DT_MIPS_RLD_MAP_REL */
6916 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6917 map
= dyn
->d_un
.d_val
;
6919 if (dyn
->d_tag
== DT_NULL
)
6923 dynamic_memaddr
+= dyn_size
;
6929 /* Read one pointer from MEMADDR in the inferior. */
6932 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6936 /* Go through a union so this works on either big or little endian
6937 hosts, when the inferior's pointer size is smaller than the size
6938 of CORE_ADDR. It is assumed the inferior's endianness is the
6939 same of the superior's. */
6942 CORE_ADDR core_addr
;
6947 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6950 if (ptr_size
== sizeof (CORE_ADDR
))
6951 *ptr
= addr
.core_addr
;
6952 else if (ptr_size
== sizeof (unsigned int))
6955 gdb_assert_not_reached ("unhandled pointer size");
6960 struct link_map_offsets
6962 /* Offset and size of r_debug.r_version. */
6963 int r_version_offset
;
6965 /* Offset and size of r_debug.r_map. */
6968 /* Offset to l_addr field in struct link_map. */
6971 /* Offset to l_name field in struct link_map. */
6974 /* Offset to l_ld field in struct link_map. */
6977 /* Offset to l_next field in struct link_map. */
6980 /* Offset to l_prev field in struct link_map. */
6984 /* Construct qXfer:libraries-svr4:read reply. */
6987 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
6988 unsigned const char *writebuf
,
6989 CORE_ADDR offset
, int len
)
6992 unsigned document_len
;
6993 struct process_info_private
*const priv
= current_process ()->priv
;
6994 char filename
[PATH_MAX
];
6997 static const struct link_map_offsets lmo_32bit_offsets
=
6999 0, /* r_version offset. */
7000 4, /* r_debug.r_map offset. */
7001 0, /* l_addr offset in link_map. */
7002 4, /* l_name offset in link_map. */
7003 8, /* l_ld offset in link_map. */
7004 12, /* l_next offset in link_map. */
7005 16 /* l_prev offset in link_map. */
7008 static const struct link_map_offsets lmo_64bit_offsets
=
7010 0, /* r_version offset. */
7011 8, /* r_debug.r_map offset. */
7012 0, /* l_addr offset in link_map. */
7013 8, /* l_name offset in link_map. */
7014 16, /* l_ld offset in link_map. */
7015 24, /* l_next offset in link_map. */
7016 32 /* l_prev offset in link_map. */
7018 const struct link_map_offsets
*lmo
;
7019 unsigned int machine
;
7021 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7022 int allocated
= 1024;
7024 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7025 int header_done
= 0;
7027 if (writebuf
!= NULL
)
7029 if (readbuf
== NULL
)
7032 pid
= lwpid_of (current_thread
);
7033 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7034 is_elf64
= elf_64_file_p (filename
, &machine
);
7035 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7036 ptr_size
= is_elf64
? 8 : 4;
7038 while (annex
[0] != '\0')
7044 sep
= strchr (annex
, '=');
7049 if (len
== 5 && startswith (annex
, "start"))
7051 else if (len
== 4 && startswith (annex
, "prev"))
7055 annex
= strchr (sep
, ';');
7062 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7069 if (priv
->r_debug
== 0)
7070 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7072 /* We failed to find DT_DEBUG. Such situation will not change
7073 for this inferior - do not retry it. Report it to GDB as
7074 E01, see for the reasons at the GDB solib-svr4.c side. */
7075 if (priv
->r_debug
== (CORE_ADDR
) -1)
7078 if (priv
->r_debug
!= 0)
7080 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7081 (unsigned char *) &r_version
,
7082 sizeof (r_version
)) != 0
7085 warning ("unexpected r_debug version %d", r_version
);
7087 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7088 &lm_addr
, ptr_size
) != 0)
7090 warning ("unable to read r_map from 0x%lx",
7091 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7096 document
= (char *) xmalloc (allocated
);
7097 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7098 p
= document
+ strlen (document
);
7101 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7102 &l_name
, ptr_size
) == 0
7103 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7104 &l_addr
, ptr_size
) == 0
7105 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7106 &l_ld
, ptr_size
) == 0
7107 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7108 &l_prev
, ptr_size
) == 0
7109 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7110 &l_next
, ptr_size
) == 0)
7112 unsigned char libname
[PATH_MAX
];
7114 if (lm_prev
!= l_prev
)
7116 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7117 (long) lm_prev
, (long) l_prev
);
7121 /* Ignore the first entry even if it has valid name as the first entry
7122 corresponds to the main executable. The first entry should not be
7123 skipped if the dynamic loader was loaded late by a static executable
7124 (see solib-svr4.c parameter ignore_first). But in such case the main
7125 executable does not have PT_DYNAMIC present and this function already
7126 exited above due to failed get_r_debug. */
7129 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7134 /* Not checking for error because reading may stop before
7135 we've got PATH_MAX worth of characters. */
7137 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7138 libname
[sizeof (libname
) - 1] = '\0';
7139 if (libname
[0] != '\0')
7141 /* 6x the size for xml_escape_text below. */
7142 size_t len
= 6 * strlen ((char *) libname
);
7146 /* Terminate `<library-list-svr4'. */
7151 while (allocated
< p
- document
+ len
+ 200)
7153 /* Expand to guarantee sufficient storage. */
7154 uintptr_t document_len
= p
- document
;
7156 document
= (char *) xrealloc (document
, 2 * allocated
);
7158 p
= document
+ document_len
;
7161 std::string name
= xml_escape_text ((char *) libname
);
7162 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7163 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7164 name
.c_str (), (unsigned long) lm_addr
,
7165 (unsigned long) l_addr
, (unsigned long) l_ld
);
7175 /* Empty list; terminate `<library-list-svr4'. */
7179 strcpy (p
, "</library-list-svr4>");
7181 document_len
= strlen (document
);
7182 if (offset
< document_len
)
7183 document_len
-= offset
;
7186 if (len
> document_len
)
7189 memcpy (readbuf
, document
+ offset
, len
);
7195 #ifdef HAVE_LINUX_BTRACE
7197 /* See to_disable_btrace target method. */
7200 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7202 enum btrace_error err
;
7204 err
= linux_disable_btrace (tinfo
);
7205 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7208 /* Encode an Intel Processor Trace configuration. */
7211 linux_low_encode_pt_config (struct buffer
*buffer
,
7212 const struct btrace_data_pt_config
*config
)
7214 buffer_grow_str (buffer
, "<pt-config>\n");
7216 switch (config
->cpu
.vendor
)
7219 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7220 "model=\"%u\" stepping=\"%u\"/>\n",
7221 config
->cpu
.family
, config
->cpu
.model
,
7222 config
->cpu
.stepping
);
7229 buffer_grow_str (buffer
, "</pt-config>\n");
7232 /* Encode a raw buffer. */
7235 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7241 /* We use hex encoding - see common/rsp-low.h. */
7242 buffer_grow_str (buffer
, "<raw>\n");
7248 elem
[0] = tohex ((*data
>> 4) & 0xf);
7249 elem
[1] = tohex (*data
++ & 0xf);
7251 buffer_grow (buffer
, elem
, 2);
7254 buffer_grow_str (buffer
, "</raw>\n");
7257 /* See to_read_btrace target method. */
7260 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7261 enum btrace_read_type type
)
7263 struct btrace_data btrace
;
7264 struct btrace_block
*block
;
7265 enum btrace_error err
;
7268 btrace_data_init (&btrace
);
7270 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7271 if (err
!= BTRACE_ERR_NONE
)
7273 if (err
== BTRACE_ERR_OVERFLOW
)
7274 buffer_grow_str0 (buffer
, "E.Overflow.");
7276 buffer_grow_str0 (buffer
, "E.Generic Error.");
7281 switch (btrace
.format
)
7283 case BTRACE_FORMAT_NONE
:
7284 buffer_grow_str0 (buffer
, "E.No Trace.");
7287 case BTRACE_FORMAT_BTS
:
7288 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7289 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7292 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7294 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7295 paddress (block
->begin
), paddress (block
->end
));
7297 buffer_grow_str0 (buffer
, "</btrace>\n");
7300 case BTRACE_FORMAT_PT
:
7301 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7302 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7303 buffer_grow_str (buffer
, "<pt>\n");
7305 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7307 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7308 btrace
.variant
.pt
.size
);
7310 buffer_grow_str (buffer
, "</pt>\n");
7311 buffer_grow_str0 (buffer
, "</btrace>\n");
7315 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7319 btrace_data_fini (&btrace
);
7323 btrace_data_fini (&btrace
);
7327 /* See to_btrace_conf target method. */
7330 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7331 struct buffer
*buffer
)
7333 const struct btrace_config
*conf
;
7335 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7336 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7338 conf
= linux_btrace_conf (tinfo
);
7341 switch (conf
->format
)
7343 case BTRACE_FORMAT_NONE
:
7346 case BTRACE_FORMAT_BTS
:
7347 buffer_xml_printf (buffer
, "<bts");
7348 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7349 buffer_xml_printf (buffer
, " />\n");
7352 case BTRACE_FORMAT_PT
:
7353 buffer_xml_printf (buffer
, "<pt");
7354 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7355 buffer_xml_printf (buffer
, "/>\n");
7360 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7363 #endif /* HAVE_LINUX_BTRACE */
7365 /* See nat/linux-nat.h. */
7368 current_lwp_ptid (void)
7370 return ptid_of (current_thread
);
7373 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7376 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7378 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7379 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7381 return default_breakpoint_kind_from_pc (pcptr
);
7384 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7386 static const gdb_byte
*
7387 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7389 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7391 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7394 /* Implementation of the target_ops method
7395 "breakpoint_kind_from_current_state". */
7398 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7400 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7401 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7403 return linux_breakpoint_kind_from_pc (pcptr
);
7406 /* Default implementation of linux_target_ops method "set_pc" for
7407 32-bit pc register which is literally named "pc". */
7410 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7412 uint32_t newpc
= pc
;
7414 supply_register_by_name (regcache
, "pc", &newpc
);
7417 /* Default implementation of linux_target_ops method "get_pc" for
7418 32-bit pc register which is literally named "pc". */
7421 linux_get_pc_32bit (struct regcache
*regcache
)
7425 collect_register_by_name (regcache
, "pc", &pc
);
7427 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7431 /* Default implementation of linux_target_ops method "set_pc" for
7432 64-bit pc register which is literally named "pc". */
7435 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7437 uint64_t newpc
= pc
;
7439 supply_register_by_name (regcache
, "pc", &newpc
);
7442 /* Default implementation of linux_target_ops method "get_pc" for
7443 64-bit pc register which is literally named "pc". */
7446 linux_get_pc_64bit (struct regcache
*regcache
)
7450 collect_register_by_name (regcache
, "pc", &pc
);
7452 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7457 static struct target_ops linux_target_ops
= {
7458 linux_create_inferior
,
7459 linux_post_create_inferior
,
7468 linux_fetch_registers
,
7469 linux_store_registers
,
7470 linux_prepare_to_access_memory
,
7471 linux_done_accessing_memory
,
7474 linux_look_up_symbols
,
7475 linux_request_interrupt
,
7477 linux_supports_z_point_type
,
7480 linux_stopped_by_sw_breakpoint
,
7481 linux_supports_stopped_by_sw_breakpoint
,
7482 linux_stopped_by_hw_breakpoint
,
7483 linux_supports_stopped_by_hw_breakpoint
,
7484 linux_supports_hardware_single_step
,
7485 linux_stopped_by_watchpoint
,
7486 linux_stopped_data_address
,
7487 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7488 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7489 && defined(PT_TEXT_END_ADDR)
7494 #ifdef USE_THREAD_DB
7495 thread_db_get_tls_address
,
7500 hostio_last_error_from_errno
,
7503 linux_supports_non_stop
,
7505 linux_start_non_stop
,
7506 linux_supports_multi_process
,
7507 linux_supports_fork_events
,
7508 linux_supports_vfork_events
,
7509 linux_supports_exec_events
,
7510 linux_handle_new_gdb_connection
,
7511 #ifdef USE_THREAD_DB
7512 thread_db_handle_monitor_command
,
7516 linux_common_core_of_thread
,
7518 linux_process_qsupported
,
7519 linux_supports_tracepoints
,
7522 linux_thread_stopped
,
7526 linux_stabilize_threads
,
7527 linux_install_fast_tracepoint_jump_pad
,
7529 linux_supports_disable_randomization
,
7530 linux_get_min_fast_tracepoint_insn_len
,
7531 linux_qxfer_libraries_svr4
,
7532 linux_supports_agent
,
7533 #ifdef HAVE_LINUX_BTRACE
7534 linux_supports_btrace
,
7535 linux_enable_btrace
,
7536 linux_low_disable_btrace
,
7537 linux_low_read_btrace
,
7538 linux_low_btrace_conf
,
7546 linux_supports_range_stepping
,
7547 linux_proc_pid_to_exec_file
,
7548 linux_mntns_open_cloexec
,
7550 linux_mntns_readlink
,
7551 linux_breakpoint_kind_from_pc
,
7552 linux_sw_breakpoint_from_kind
,
7553 linux_proc_tid_get_name
,
7554 linux_breakpoint_kind_from_current_state
,
7555 linux_supports_software_single_step
,
7556 linux_supports_catch_syscall
,
7557 linux_get_ipa_tdesc_idx
,
7559 thread_db_thread_handle
,
7565 #ifdef HAVE_LINUX_REGSETS
7567 initialize_regsets_info (struct regsets_info
*info
)
7569 for (info
->num_regsets
= 0;
7570 info
->regsets
[info
->num_regsets
].size
>= 0;
7571 info
->num_regsets
++)
7577 initialize_low (void)
7579 struct sigaction sigchld_action
;
7581 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7582 set_target_ops (&linux_target_ops
);
7584 linux_ptrace_init_warnings ();
7586 sigchld_action
.sa_handler
= sigchld_handler
;
7587 sigemptyset (&sigchld_action
.sa_mask
);
7588 sigchld_action
.sa_flags
= SA_RESTART
;
7589 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7591 initialize_low_arch ();
7593 linux_check_ptrace_features ();