1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2019 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"
22 #include "common/agent.h"
24 #include "common/rsp-low.h"
25 #include "common/signals-state-save-restore.h"
26 #include "nat/linux-nat.h"
27 #include "nat/linux-waitpid.h"
28 #include "common/gdb_wait.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 "common/filestuff.h"
47 #include "tracepoint.h"
50 #include "common/common-inferior.h"
51 #include "nat/fork-inferior.h"
52 #include "common/environ.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
82 /* Some targets did not define these ptrace constants from the start,
83 so gdbserver defines them locally here. In the future, these may
84 be removed after they are added to asm/ptrace.h. */
85 #if !(defined(PT_TEXT_ADDR) \
86 || defined(PT_DATA_ADDR) \
87 || defined(PT_TEXT_END_ADDR))
88 #if defined(__mcoldfire__)
89 /* These are still undefined in 3.10 kernels. */
90 #define PT_TEXT_ADDR 49*4
91 #define PT_DATA_ADDR 50*4
92 #define PT_TEXT_END_ADDR 51*4
93 /* BFIN already defines these since at least 2.6.32 kernels. */
95 #define PT_TEXT_ADDR 220
96 #define PT_TEXT_END_ADDR 224
97 #define PT_DATA_ADDR 228
98 /* These are still undefined in 3.10 kernels. */
99 #elif defined(__TMS320C6X__)
100 #define PT_TEXT_ADDR (0x10000*4)
101 #define PT_DATA_ADDR (0x10004*4)
102 #define PT_TEXT_END_ADDR (0x10008*4)
106 #ifdef HAVE_LINUX_BTRACE
107 # include "nat/linux-btrace.h"
108 # include "common/btrace-common.h"
111 #ifndef HAVE_ELF32_AUXV_T
112 /* Copied from glibc's elf.h. */
115 uint32_t a_type
; /* Entry type */
118 uint32_t a_val
; /* Integer value */
119 /* We use to have pointer elements added here. We cannot do that,
120 though, since it does not work when using 32-bit definitions
121 on 64-bit platforms and vice versa. */
126 #ifndef HAVE_ELF64_AUXV_T
127 /* Copied from glibc's elf.h. */
130 uint64_t a_type
; /* Entry type */
133 uint64_t a_val
; /* Integer value */
134 /* We use to have pointer elements added here. We cannot do that,
135 though, since it does not work when using 32-bit definitions
136 on 64-bit platforms and vice versa. */
141 /* Does the current host support PTRACE_GETREGSET? */
142 int have_ptrace_getregset
= -1;
146 /* See nat/linux-nat.h. */
149 ptid_of_lwp (struct lwp_info
*lwp
)
151 return ptid_of (get_lwp_thread (lwp
));
154 /* See nat/linux-nat.h. */
157 lwp_set_arch_private_info (struct lwp_info
*lwp
,
158 struct arch_lwp_info
*info
)
160 lwp
->arch_private
= info
;
163 /* See nat/linux-nat.h. */
165 struct arch_lwp_info
*
166 lwp_arch_private_info (struct lwp_info
*lwp
)
168 return lwp
->arch_private
;
171 /* See nat/linux-nat.h. */
174 lwp_is_stopped (struct lwp_info
*lwp
)
179 /* See nat/linux-nat.h. */
181 enum target_stop_reason
182 lwp_stop_reason (struct lwp_info
*lwp
)
184 return lwp
->stop_reason
;
187 /* See nat/linux-nat.h. */
190 lwp_is_stepping (struct lwp_info
*lwp
)
192 return lwp
->stepping
;
195 /* A list of all unknown processes which receive stop signals. Some
196 other process will presumably claim each of these as forked
197 children momentarily. */
199 struct simple_pid_list
201 /* The process ID. */
204 /* The status as reported by waitpid. */
208 struct simple_pid_list
*next
;
210 struct simple_pid_list
*stopped_pids
;
212 /* Trivial list manipulation functions to keep track of a list of new
213 stopped processes. */
216 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
218 struct simple_pid_list
*new_pid
= XNEW (struct simple_pid_list
);
221 new_pid
->status
= status
;
222 new_pid
->next
= *listp
;
227 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
229 struct simple_pid_list
**p
;
231 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
232 if ((*p
)->pid
== pid
)
234 struct simple_pid_list
*next
= (*p
)->next
;
236 *statusp
= (*p
)->status
;
244 enum stopping_threads_kind
246 /* Not stopping threads presently. */
247 NOT_STOPPING_THREADS
,
249 /* Stopping threads. */
252 /* Stopping and suspending threads. */
253 STOPPING_AND_SUSPENDING_THREADS
256 /* This is set while stop_all_lwps is in effect. */
257 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
259 /* FIXME make into a target method? */
260 int using_threads
= 1;
262 /* True if we're presently stabilizing threads (moving them out of
264 static int stabilizing_threads
;
266 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
267 int step
, int signal
, siginfo_t
*info
);
268 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
269 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
270 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
271 static void unsuspend_all_lwps (struct lwp_info
*except
);
272 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
273 int *wstat
, int options
);
274 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
275 static struct lwp_info
*add_lwp (ptid_t ptid
);
276 static void linux_mourn (struct process_info
*process
);
277 static int linux_stopped_by_watchpoint (void);
278 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
279 static int lwp_is_marked_dead (struct lwp_info
*lwp
);
280 static void proceed_all_lwps (void);
281 static int finish_step_over (struct lwp_info
*lwp
);
282 static int kill_lwp (unsigned long lwpid
, int signo
);
283 static void enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
);
284 static void complete_ongoing_step_over (void);
285 static int linux_low_ptrace_options (int attached
);
286 static int check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
);
287 static void proceed_one_lwp (thread_info
*thread
, lwp_info
*except
);
289 /* When the event-loop is doing a step-over, this points at the thread
291 ptid_t step_over_bkpt
;
293 /* True if the low target can hardware single-step. */
296 can_hardware_single_step (void)
298 if (the_low_target
.supports_hardware_single_step
!= NULL
)
299 return the_low_target
.supports_hardware_single_step ();
304 /* True if the low target can software single-step. Such targets
305 implement the GET_NEXT_PCS callback. */
308 can_software_single_step (void)
310 return (the_low_target
.get_next_pcs
!= NULL
);
313 /* True if the low target supports memory breakpoints. If so, we'll
314 have a GET_PC implementation. */
317 supports_breakpoints (void)
319 return (the_low_target
.get_pc
!= NULL
);
322 /* Returns true if this target can support fast tracepoints. This
323 does not mean that the in-process agent has been loaded in the
327 supports_fast_tracepoints (void)
329 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
332 /* True if LWP is stopped in its stepping range. */
335 lwp_in_step_range (struct lwp_info
*lwp
)
337 CORE_ADDR pc
= lwp
->stop_pc
;
339 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
342 struct pending_signals
346 struct pending_signals
*prev
;
349 /* The read/write ends of the pipe registered as waitable file in the
351 static int linux_event_pipe
[2] = { -1, -1 };
353 /* True if we're currently in async mode. */
354 #define target_is_async_p() (linux_event_pipe[0] != -1)
356 static void send_sigstop (struct lwp_info
*lwp
);
357 static void wait_for_sigstop (void);
359 /* Return non-zero if HEADER is a 64-bit ELF file. */
362 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
364 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
365 && header
->e_ident
[EI_MAG1
] == ELFMAG1
366 && header
->e_ident
[EI_MAG2
] == ELFMAG2
367 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
369 *machine
= header
->e_machine
;
370 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
377 /* Return non-zero if FILE is a 64-bit ELF file,
378 zero if the file is not a 64-bit ELF file,
379 and -1 if the file is not accessible or doesn't exist. */
382 elf_64_file_p (const char *file
, unsigned int *machine
)
387 fd
= open (file
, O_RDONLY
);
391 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
398 return elf_64_header_p (&header
, machine
);
401 /* Accepts an integer PID; Returns true if the executable PID is
402 running is a 64-bit ELF file.. */
405 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
409 sprintf (file
, "/proc/%d/exe", pid
);
410 return elf_64_file_p (file
, machine
);
414 delete_lwp (struct lwp_info
*lwp
)
416 struct thread_info
*thr
= get_lwp_thread (lwp
);
419 debug_printf ("deleting %ld\n", lwpid_of (thr
));
423 if (the_low_target
.delete_thread
!= NULL
)
424 the_low_target
.delete_thread (lwp
->arch_private
);
426 gdb_assert (lwp
->arch_private
== NULL
);
431 /* Add a process to the common process list, and set its private
434 static struct process_info
*
435 linux_add_process (int pid
, int attached
)
437 struct process_info
*proc
;
439 proc
= add_process (pid
, attached
);
440 proc
->priv
= XCNEW (struct process_info_private
);
442 if (the_low_target
.new_process
!= NULL
)
443 proc
->priv
->arch_private
= the_low_target
.new_process ();
448 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
450 /* Call the target arch_setup function on the current thread. */
453 linux_arch_setup (void)
455 the_low_target
.arch_setup ();
458 /* Call the target arch_setup function on THREAD. */
461 linux_arch_setup_thread (struct thread_info
*thread
)
463 struct thread_info
*saved_thread
;
465 saved_thread
= current_thread
;
466 current_thread
= thread
;
470 current_thread
= saved_thread
;
473 /* Handle a GNU/Linux extended wait response. If we see a clone,
474 fork, or vfork event, we need to add the new LWP to our list
475 (and return 0 so as not to report the trap to higher layers).
476 If we see an exec event, we will modify ORIG_EVENT_LWP to point
477 to a new LWP representing the new program. */
480 handle_extended_wait (struct lwp_info
**orig_event_lwp
, int wstat
)
482 client_state
&cs
= get_client_state ();
483 struct lwp_info
*event_lwp
= *orig_event_lwp
;
484 int event
= linux_ptrace_get_extended_event (wstat
);
485 struct thread_info
*event_thr
= get_lwp_thread (event_lwp
);
486 struct lwp_info
*new_lwp
;
488 gdb_assert (event_lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
490 /* All extended events we currently use are mid-syscall. Only
491 PTRACE_EVENT_STOP is delivered more like a signal-stop, but
492 you have to be using PTRACE_SEIZE to get that. */
493 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
495 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
496 || (event
== PTRACE_EVENT_CLONE
))
499 unsigned long new_pid
;
502 /* Get the pid of the new lwp. */
503 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
506 /* If we haven't already seen the new PID stop, wait for it now. */
507 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
509 /* The new child has a pending SIGSTOP. We can't affect it until it
510 hits the SIGSTOP, but we're already attached. */
512 ret
= my_waitpid (new_pid
, &status
, __WALL
);
515 perror_with_name ("waiting for new child");
516 else if (ret
!= new_pid
)
517 warning ("wait returned unexpected PID %d", ret
);
518 else if (!WIFSTOPPED (status
))
519 warning ("wait returned unexpected status 0x%x", status
);
522 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
524 struct process_info
*parent_proc
;
525 struct process_info
*child_proc
;
526 struct lwp_info
*child_lwp
;
527 struct thread_info
*child_thr
;
528 struct target_desc
*tdesc
;
530 ptid
= ptid_t (new_pid
, new_pid
, 0);
534 debug_printf ("HEW: Got fork event from LWP %ld, "
536 ptid_of (event_thr
).lwp (),
540 /* Add the new process to the tables and clone the breakpoint
541 lists of the parent. We need to do this even if the new process
542 will be detached, since we will need the process object and the
543 breakpoints to remove any breakpoints from memory when we
544 detach, and the client side will access registers. */
545 child_proc
= linux_add_process (new_pid
, 0);
546 gdb_assert (child_proc
!= NULL
);
547 child_lwp
= add_lwp (ptid
);
548 gdb_assert (child_lwp
!= NULL
);
549 child_lwp
->stopped
= 1;
550 child_lwp
->must_set_ptrace_flags
= 1;
551 child_lwp
->status_pending_p
= 0;
552 child_thr
= get_lwp_thread (child_lwp
);
553 child_thr
->last_resume_kind
= resume_stop
;
554 child_thr
->last_status
.kind
= TARGET_WAITKIND_STOPPED
;
556 /* If we're suspending all threads, leave this one suspended
557 too. If the fork/clone parent is stepping over a breakpoint,
558 all other threads have been suspended already. Leave the
559 child suspended too. */
560 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
561 || event_lwp
->bp_reinsert
!= 0)
564 debug_printf ("HEW: leaving child suspended\n");
565 child_lwp
->suspended
= 1;
568 parent_proc
= get_thread_process (event_thr
);
569 child_proc
->attached
= parent_proc
->attached
;
571 if (event_lwp
->bp_reinsert
!= 0
572 && can_software_single_step ()
573 && event
== PTRACE_EVENT_VFORK
)
575 /* If we leave single-step breakpoints there, child will
576 hit it, so uninsert single-step breakpoints from parent
577 (and child). Once vfork child is done, reinsert
578 them back to parent. */
579 uninsert_single_step_breakpoints (event_thr
);
582 clone_all_breakpoints (child_thr
, event_thr
);
584 tdesc
= allocate_target_description ();
585 copy_target_description (tdesc
, parent_proc
->tdesc
);
586 child_proc
->tdesc
= tdesc
;
588 /* Clone arch-specific process data. */
589 if (the_low_target
.new_fork
!= NULL
)
590 the_low_target
.new_fork (parent_proc
, child_proc
);
592 /* Save fork info in the parent thread. */
593 if (event
== PTRACE_EVENT_FORK
)
594 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
595 else if (event
== PTRACE_EVENT_VFORK
)
596 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
598 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
600 /* The status_pending field contains bits denoting the
601 extended event, so when the pending event is handled,
602 the handler will look at lwp->waitstatus. */
603 event_lwp
->status_pending_p
= 1;
604 event_lwp
->status_pending
= wstat
;
606 /* Link the threads until the parent event is passed on to
608 event_lwp
->fork_relative
= child_lwp
;
609 child_lwp
->fork_relative
= event_lwp
;
611 /* If the parent thread is doing step-over with single-step
612 breakpoints, the list of single-step breakpoints are cloned
613 from the parent's. Remove them from the child process.
614 In case of vfork, we'll reinsert them back once vforked
616 if (event_lwp
->bp_reinsert
!= 0
617 && can_software_single_step ())
619 /* The child process is forked and stopped, so it is safe
620 to access its memory without stopping all other threads
621 from other processes. */
622 delete_single_step_breakpoints (child_thr
);
624 gdb_assert (has_single_step_breakpoints (event_thr
));
625 gdb_assert (!has_single_step_breakpoints (child_thr
));
628 /* Report the event. */
633 debug_printf ("HEW: Got clone event "
634 "from LWP %ld, new child is LWP %ld\n",
635 lwpid_of (event_thr
), new_pid
);
637 ptid
= ptid_t (pid_of (event_thr
), new_pid
, 0);
638 new_lwp
= add_lwp (ptid
);
640 /* Either we're going to immediately resume the new thread
641 or leave it stopped. linux_resume_one_lwp is a nop if it
642 thinks the thread is currently running, so set this first
643 before calling linux_resume_one_lwp. */
644 new_lwp
->stopped
= 1;
646 /* If we're suspending all threads, leave this one suspended
647 too. If the fork/clone parent is stepping over a breakpoint,
648 all other threads have been suspended already. Leave the
649 child suspended too. */
650 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
651 || event_lwp
->bp_reinsert
!= 0)
652 new_lwp
->suspended
= 1;
654 /* Normally we will get the pending SIGSTOP. But in some cases
655 we might get another signal delivered to the group first.
656 If we do get another signal, be sure not to lose it. */
657 if (WSTOPSIG (status
) != SIGSTOP
)
659 new_lwp
->stop_expected
= 1;
660 new_lwp
->status_pending_p
= 1;
661 new_lwp
->status_pending
= status
;
663 else if (cs
.report_thread_events
)
665 new_lwp
->waitstatus
.kind
= TARGET_WAITKIND_THREAD_CREATED
;
666 new_lwp
->status_pending_p
= 1;
667 new_lwp
->status_pending
= status
;
671 thread_db_notice_clone (event_thr
, ptid
);
674 /* Don't report the event. */
677 else if (event
== PTRACE_EVENT_VFORK_DONE
)
679 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
681 if (event_lwp
->bp_reinsert
!= 0 && can_software_single_step ())
683 reinsert_single_step_breakpoints (event_thr
);
685 gdb_assert (has_single_step_breakpoints (event_thr
));
688 /* Report the event. */
691 else if (event
== PTRACE_EVENT_EXEC
&& cs
.report_exec_events
)
693 struct process_info
*proc
;
694 std::vector
<int> syscalls_to_catch
;
700 debug_printf ("HEW: Got exec event from LWP %ld\n",
701 lwpid_of (event_thr
));
704 /* Get the event ptid. */
705 event_ptid
= ptid_of (event_thr
);
706 event_pid
= event_ptid
.pid ();
708 /* Save the syscall list from the execing process. */
709 proc
= get_thread_process (event_thr
);
710 syscalls_to_catch
= std::move (proc
->syscalls_to_catch
);
712 /* Delete the execing process and all its threads. */
714 current_thread
= NULL
;
716 /* Create a new process/lwp/thread. */
717 proc
= linux_add_process (event_pid
, 0);
718 event_lwp
= add_lwp (event_ptid
);
719 event_thr
= get_lwp_thread (event_lwp
);
720 gdb_assert (current_thread
== event_thr
);
721 linux_arch_setup_thread (event_thr
);
723 /* Set the event status. */
724 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
725 event_lwp
->waitstatus
.value
.execd_pathname
726 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
728 /* Mark the exec status as pending. */
729 event_lwp
->stopped
= 1;
730 event_lwp
->status_pending_p
= 1;
731 event_lwp
->status_pending
= wstat
;
732 event_thr
->last_resume_kind
= resume_continue
;
733 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
735 /* Update syscall state in the new lwp, effectively mid-syscall too. */
736 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
738 /* Restore the list to catch. Don't rely on the client, which is free
739 to avoid sending a new list when the architecture doesn't change.
740 Also, for ANY_SYSCALL, the architecture doesn't really matter. */
741 proc
->syscalls_to_catch
= std::move (syscalls_to_catch
);
743 /* Report the event. */
744 *orig_event_lwp
= event_lwp
;
748 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
751 /* Return the PC as read from the regcache of LWP, without any
755 get_pc (struct lwp_info
*lwp
)
757 struct thread_info
*saved_thread
;
758 struct regcache
*regcache
;
761 if (the_low_target
.get_pc
== NULL
)
764 saved_thread
= current_thread
;
765 current_thread
= get_lwp_thread (lwp
);
767 regcache
= get_thread_regcache (current_thread
, 1);
768 pc
= (*the_low_target
.get_pc
) (regcache
);
771 debug_printf ("pc is 0x%lx\n", (long) pc
);
773 current_thread
= saved_thread
;
777 /* This function should only be called if LWP got a SYSCALL_SIGTRAP.
778 Fill *SYSNO with the syscall nr trapped. */
781 get_syscall_trapinfo (struct lwp_info
*lwp
, int *sysno
)
783 struct thread_info
*saved_thread
;
784 struct regcache
*regcache
;
786 if (the_low_target
.get_syscall_trapinfo
== NULL
)
788 /* If we cannot get the syscall trapinfo, report an unknown
789 system call number. */
790 *sysno
= UNKNOWN_SYSCALL
;
794 saved_thread
= current_thread
;
795 current_thread
= get_lwp_thread (lwp
);
797 regcache
= get_thread_regcache (current_thread
, 1);
798 (*the_low_target
.get_syscall_trapinfo
) (regcache
, sysno
);
801 debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno
);
803 current_thread
= saved_thread
;
806 static int check_stopped_by_watchpoint (struct lwp_info
*child
);
808 /* Called when the LWP stopped for a signal/trap. If it stopped for a
809 trap check what caused it (breakpoint, watchpoint, trace, etc.),
810 and save the result in the LWP's stop_reason field. If it stopped
811 for a breakpoint, decrement the PC if necessary on the lwp's
812 architecture. Returns true if we now have the LWP's stop PC. */
815 save_stop_reason (struct lwp_info
*lwp
)
818 CORE_ADDR sw_breakpoint_pc
;
819 struct thread_info
*saved_thread
;
820 #if USE_SIGTRAP_SIGINFO
824 if (the_low_target
.get_pc
== NULL
)
828 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
830 /* breakpoint_at reads from the current thread. */
831 saved_thread
= current_thread
;
832 current_thread
= get_lwp_thread (lwp
);
834 #if USE_SIGTRAP_SIGINFO
835 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
836 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
838 if (siginfo
.si_signo
== SIGTRAP
)
840 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
)
841 && GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
843 /* The si_code is ambiguous on this arch -- check debug
845 if (!check_stopped_by_watchpoint (lwp
))
846 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
848 else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
850 /* If we determine the LWP stopped for a SW breakpoint,
851 trust it. Particularly don't check watchpoint
852 registers, because at least on s390, we'd find
853 stopped-by-watchpoint as long as there's a watchpoint
855 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
857 else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
859 /* This can indicate either a hardware breakpoint or
860 hardware watchpoint. Check debug registers. */
861 if (!check_stopped_by_watchpoint (lwp
))
862 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
864 else if (siginfo
.si_code
== TRAP_TRACE
)
866 /* We may have single stepped an instruction that
867 triggered a watchpoint. In that case, on some
868 architectures (such as x86), instead of TRAP_HWBKPT,
869 si_code indicates TRAP_TRACE, and we need to check
870 the debug registers separately. */
871 if (!check_stopped_by_watchpoint (lwp
))
872 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
877 /* We may have just stepped a breakpoint instruction. E.g., in
878 non-stop mode, GDB first tells the thread A to step a range, and
879 then the user inserts a breakpoint inside the range. In that
880 case we need to report the breakpoint PC. */
881 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
882 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
883 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
885 if (hardware_breakpoint_inserted_here (pc
))
886 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
888 if (lwp
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
)
889 check_stopped_by_watchpoint (lwp
);
892 if (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
896 struct thread_info
*thr
= get_lwp_thread (lwp
);
898 debug_printf ("CSBB: %s stopped by software breakpoint\n",
899 target_pid_to_str (ptid_of (thr
)));
902 /* Back up the PC if necessary. */
903 if (pc
!= sw_breakpoint_pc
)
905 struct regcache
*regcache
906 = get_thread_regcache (current_thread
, 1);
907 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
910 /* Update this so we record the correct stop PC below. */
911 pc
= sw_breakpoint_pc
;
913 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
)
917 struct thread_info
*thr
= get_lwp_thread (lwp
);
919 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
920 target_pid_to_str (ptid_of (thr
)));
923 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
927 struct thread_info
*thr
= get_lwp_thread (lwp
);
929 debug_printf ("CSBB: %s stopped by hardware watchpoint\n",
930 target_pid_to_str (ptid_of (thr
)));
933 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
)
937 struct thread_info
*thr
= get_lwp_thread (lwp
);
939 debug_printf ("CSBB: %s stopped by trace\n",
940 target_pid_to_str (ptid_of (thr
)));
945 current_thread
= saved_thread
;
949 static struct lwp_info
*
950 add_lwp (ptid_t ptid
)
952 struct lwp_info
*lwp
;
954 lwp
= XCNEW (struct lwp_info
);
956 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
958 lwp
->thread
= add_thread (ptid
, lwp
);
960 if (the_low_target
.new_thread
!= NULL
)
961 the_low_target
.new_thread (lwp
);
966 /* Callback to be used when calling fork_inferior, responsible for
967 actually initiating the tracing of the inferior. */
972 if (ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0,
973 (PTRACE_TYPE_ARG4
) 0) < 0)
974 trace_start_error_with_name ("ptrace");
976 if (setpgid (0, 0) < 0)
977 trace_start_error_with_name ("setpgid");
979 /* If GDBserver is connected to gdb via stdio, redirect the inferior's
980 stdout to stderr so that inferior i/o doesn't corrupt the connection.
981 Also, redirect stdin to /dev/null. */
982 if (remote_connection_is_stdio ())
985 trace_start_error_with_name ("close");
986 if (open ("/dev/null", O_RDONLY
) < 0)
987 trace_start_error_with_name ("open");
989 trace_start_error_with_name ("dup2");
990 if (write (2, "stdin/stdout redirected\n",
991 sizeof ("stdin/stdout redirected\n") - 1) < 0)
993 /* Errors ignored. */;
998 /* Start an inferior process and returns its pid.
999 PROGRAM is the name of the program to be started, and PROGRAM_ARGS
1000 are its arguments. */
1003 linux_create_inferior (const char *program
,
1004 const std::vector
<char *> &program_args
)
1006 client_state
&cs
= get_client_state ();
1007 struct lwp_info
*new_lwp
;
1012 maybe_disable_address_space_randomization restore_personality
1013 (cs
.disable_randomization
);
1014 std::string str_program_args
= stringify_argv (program_args
);
1016 pid
= fork_inferior (program
,
1017 str_program_args
.c_str (),
1018 get_environ ()->envp (), linux_ptrace_fun
,
1019 NULL
, NULL
, NULL
, NULL
);
1022 linux_add_process (pid
, 0);
1024 ptid
= ptid_t (pid
, pid
, 0);
1025 new_lwp
= add_lwp (ptid
);
1026 new_lwp
->must_set_ptrace_flags
= 1;
1028 post_fork_inferior (pid
, program
);
1033 /* Implement the post_create_inferior target_ops method. */
1036 linux_post_create_inferior (void)
1038 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
1040 linux_arch_setup ();
1042 if (lwp
->must_set_ptrace_flags
)
1044 struct process_info
*proc
= current_process ();
1045 int options
= linux_low_ptrace_options (proc
->attached
);
1047 linux_enable_event_reporting (lwpid_of (current_thread
), options
);
1048 lwp
->must_set_ptrace_flags
= 0;
1052 /* Attach to an inferior process. Returns 0 on success, ERRNO on
1056 linux_attach_lwp (ptid_t ptid
)
1058 struct lwp_info
*new_lwp
;
1059 int lwpid
= ptid
.lwp ();
1061 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
1065 new_lwp
= add_lwp (ptid
);
1067 /* We need to wait for SIGSTOP before being able to make the next
1068 ptrace call on this LWP. */
1069 new_lwp
->must_set_ptrace_flags
= 1;
1071 if (linux_proc_pid_is_stopped (lwpid
))
1074 debug_printf ("Attached to a stopped process\n");
1076 /* The process is definitely stopped. It is in a job control
1077 stop, unless the kernel predates the TASK_STOPPED /
1078 TASK_TRACED distinction, in which case it might be in a
1079 ptrace stop. Make sure it is in a ptrace stop; from there we
1080 can kill it, signal it, et cetera.
1082 First make sure there is a pending SIGSTOP. Since we are
1083 already attached, the process can not transition from stopped
1084 to running without a PTRACE_CONT; so we know this signal will
1085 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1086 probably already in the queue (unless this kernel is old
1087 enough to use TASK_STOPPED for ptrace stops); but since
1088 SIGSTOP is not an RT signal, it can only be queued once. */
1089 kill_lwp (lwpid
, SIGSTOP
);
1091 /* Finally, resume the stopped process. This will deliver the
1092 SIGSTOP (or a higher priority signal, just like normal
1093 PTRACE_ATTACH), which we'll catch later on. */
1094 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1097 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
1098 brings it to a halt.
1100 There are several cases to consider here:
1102 1) gdbserver has already attached to the process and is being notified
1103 of a new thread that is being created.
1104 In this case we should ignore that SIGSTOP and resume the
1105 process. This is handled below by setting stop_expected = 1,
1106 and the fact that add_thread sets last_resume_kind ==
1109 2) This is the first thread (the process thread), and we're attaching
1110 to it via attach_inferior.
1111 In this case we want the process thread to stop.
1112 This is handled by having linux_attach set last_resume_kind ==
1113 resume_stop after we return.
1115 If the pid we are attaching to is also the tgid, we attach to and
1116 stop all the existing threads. Otherwise, we attach to pid and
1117 ignore any other threads in the same group as this pid.
1119 3) GDB is connecting to gdbserver and is requesting an enumeration of all
1121 In this case we want the thread to stop.
1122 FIXME: This case is currently not properly handled.
1123 We should wait for the SIGSTOP but don't. Things work apparently
1124 because enough time passes between when we ptrace (ATTACH) and when
1125 gdb makes the next ptrace call on the thread.
1127 On the other hand, if we are currently trying to stop all threads, we
1128 should treat the new thread as if we had sent it a SIGSTOP. This works
1129 because we are guaranteed that the add_lwp call above added us to the
1130 end of the list, and so the new thread has not yet reached
1131 wait_for_sigstop (but will). */
1132 new_lwp
->stop_expected
= 1;
1137 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
1138 already attached. Returns true if a new LWP is found, false
1142 attach_proc_task_lwp_callback (ptid_t ptid
)
1144 /* Is this a new thread? */
1145 if (find_thread_ptid (ptid
) == NULL
)
1147 int lwpid
= ptid
.lwp ();
1151 debug_printf ("Found new lwp %d\n", lwpid
);
1153 err
= linux_attach_lwp (ptid
);
1155 /* Be quiet if we simply raced with the thread exiting. EPERM
1156 is returned if the thread's task still exists, and is marked
1157 as exited or zombie, as well as other conditions, so in that
1158 case, confirm the status in /proc/PID/status. */
1160 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1164 debug_printf ("Cannot attach to lwp %d: "
1165 "thread is gone (%d: %s)\n",
1166 lwpid
, err
, strerror (err
));
1172 = linux_ptrace_attach_fail_reason_string (ptid
, err
);
1174 warning (_("Cannot attach to lwp %d: %s"), lwpid
, reason
.c_str ());
1182 static void async_file_mark (void);
1184 /* Attach to PID. If PID is the tgid, attach to it and all
1188 linux_attach (unsigned long pid
)
1190 struct process_info
*proc
;
1191 struct thread_info
*initial_thread
;
1192 ptid_t ptid
= ptid_t (pid
, pid
, 0);
1195 proc
= linux_add_process (pid
, 1);
1197 /* Attach to PID. We will check for other threads
1199 err
= linux_attach_lwp (ptid
);
1202 remove_process (proc
);
1204 std::string reason
= linux_ptrace_attach_fail_reason_string (ptid
, err
);
1205 error ("Cannot attach to process %ld: %s", pid
, reason
.c_str ());
1208 /* Don't ignore the initial SIGSTOP if we just attached to this
1209 process. It will be collected by wait shortly. */
1210 initial_thread
= find_thread_ptid (ptid_t (pid
, pid
, 0));
1211 initial_thread
->last_resume_kind
= resume_stop
;
1213 /* We must attach to every LWP. If /proc is mounted, use that to
1214 find them now. On the one hand, the inferior may be using raw
1215 clone instead of using pthreads. On the other hand, even if it
1216 is using pthreads, GDB may not be connected yet (thread_db needs
1217 to do symbol lookups, through qSymbol). Also, thread_db walks
1218 structures in the inferior's address space to find the list of
1219 threads/LWPs, and those structures may well be corrupted. Note
1220 that once thread_db is loaded, we'll still use it to list threads
1221 and associate pthread info with each LWP. */
1222 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1224 /* GDB will shortly read the xml target description for this
1225 process, to figure out the process' architecture. But the target
1226 description is only filled in when the first process/thread in
1227 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1228 that now, otherwise, if GDB is fast enough, it could read the
1229 target description _before_ that initial stop. */
1232 struct lwp_info
*lwp
;
1234 ptid_t pid_ptid
= ptid_t (pid
);
1236 lwpid
= linux_wait_for_event_filtered (pid_ptid
, pid_ptid
,
1238 gdb_assert (lwpid
> 0);
1240 lwp
= find_lwp_pid (ptid_t (lwpid
));
1242 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGSTOP
)
1244 lwp
->status_pending_p
= 1;
1245 lwp
->status_pending
= wstat
;
1248 initial_thread
->last_resume_kind
= resume_continue
;
1252 gdb_assert (proc
->tdesc
!= NULL
);
1259 last_thread_of_process_p (int pid
)
1261 bool seen_one
= false;
1263 thread_info
*thread
= find_thread (pid
, [&] (thread_info
*thr_arg
)
1267 /* This is the first thread of this process we see. */
1273 /* This is the second thread of this process we see. */
1278 return thread
== NULL
;
1284 linux_kill_one_lwp (struct lwp_info
*lwp
)
1286 struct thread_info
*thr
= get_lwp_thread (lwp
);
1287 int pid
= lwpid_of (thr
);
1289 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1290 there is no signal context, and ptrace(PTRACE_KILL) (or
1291 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1292 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1293 alternative is to kill with SIGKILL. We only need one SIGKILL
1294 per process, not one for each thread. But since we still support
1295 support debugging programs using raw clone without CLONE_THREAD,
1296 we send one for each thread. For years, we used PTRACE_KILL
1297 only, so we're being a bit paranoid about some old kernels where
1298 PTRACE_KILL might work better (dubious if there are any such, but
1299 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1300 second, and so we're fine everywhere. */
1303 kill_lwp (pid
, SIGKILL
);
1306 int save_errno
= errno
;
1308 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1309 target_pid_to_str (ptid_of (thr
)),
1310 save_errno
? strerror (save_errno
) : "OK");
1314 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1317 int save_errno
= errno
;
1319 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1320 target_pid_to_str (ptid_of (thr
)),
1321 save_errno
? strerror (save_errno
) : "OK");
1325 /* Kill LWP and wait for it to die. */
1328 kill_wait_lwp (struct lwp_info
*lwp
)
1330 struct thread_info
*thr
= get_lwp_thread (lwp
);
1331 int pid
= ptid_of (thr
).pid ();
1332 int lwpid
= ptid_of (thr
).lwp ();
1337 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1341 linux_kill_one_lwp (lwp
);
1343 /* Make sure it died. Notes:
1345 - The loop is most likely unnecessary.
1347 - We don't use linux_wait_for_event as that could delete lwps
1348 while we're iterating over them. We're not interested in
1349 any pending status at this point, only in making sure all
1350 wait status on the kernel side are collected until the
1353 - We don't use __WALL here as the __WALL emulation relies on
1354 SIGCHLD, and killing a stopped process doesn't generate
1355 one, nor an exit status.
1357 res
= my_waitpid (lwpid
, &wstat
, 0);
1358 if (res
== -1 && errno
== ECHILD
)
1359 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1360 } while (res
> 0 && WIFSTOPPED (wstat
));
1362 /* Even if it was stopped, the child may have already disappeared.
1363 E.g., if it was killed by SIGKILL. */
1364 if (res
< 0 && errno
!= ECHILD
)
1365 perror_with_name ("kill_wait_lwp");
1368 /* Callback for `for_each_thread'. Kills an lwp of a given process,
1369 except the leader. */
1372 kill_one_lwp_callback (thread_info
*thread
, int pid
)
1374 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1376 /* We avoid killing the first thread here, because of a Linux kernel (at
1377 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1378 the children get a chance to be reaped, it will remain a zombie
1381 if (lwpid_of (thread
) == pid
)
1384 debug_printf ("lkop: is last of process %s\n",
1385 target_pid_to_str (thread
->id
));
1389 kill_wait_lwp (lwp
);
1393 linux_kill (process_info
*process
)
1395 int pid
= process
->pid
;
1397 /* If we're killing a running inferior, make sure it is stopped
1398 first, as PTRACE_KILL will not work otherwise. */
1399 stop_all_lwps (0, NULL
);
1401 for_each_thread (pid
, [&] (thread_info
*thread
)
1403 kill_one_lwp_callback (thread
, pid
);
1406 /* See the comment in linux_kill_one_lwp. We did not kill the first
1407 thread in the list, so do so now. */
1408 lwp_info
*lwp
= find_lwp_pid (ptid_t (pid
));
1413 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1417 kill_wait_lwp (lwp
);
1419 the_target
->mourn (process
);
1421 /* Since we presently can only stop all lwps of all processes, we
1422 need to unstop lwps of other processes. */
1423 unstop_all_lwps (0, NULL
);
1427 /* Get pending signal of THREAD, for detaching purposes. This is the
1428 signal the thread last stopped for, which we need to deliver to the
1429 thread when detaching, otherwise, it'd be suppressed/lost. */
1432 get_detach_signal (struct thread_info
*thread
)
1434 client_state
&cs
= get_client_state ();
1435 enum gdb_signal signo
= GDB_SIGNAL_0
;
1437 struct lwp_info
*lp
= get_thread_lwp (thread
);
1439 if (lp
->status_pending_p
)
1440 status
= lp
->status_pending
;
1443 /* If the thread had been suspended by gdbserver, and it stopped
1444 cleanly, then it'll have stopped with SIGSTOP. But we don't
1445 want to deliver that SIGSTOP. */
1446 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1447 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1450 /* Otherwise, we may need to deliver the signal we
1452 status
= lp
->last_status
;
1455 if (!WIFSTOPPED (status
))
1458 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1459 target_pid_to_str (ptid_of (thread
)));
1463 /* Extended wait statuses aren't real SIGTRAPs. */
1464 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1467 debug_printf ("GPS: lwp %s had stopped with extended "
1468 "status: no pending signal\n",
1469 target_pid_to_str (ptid_of (thread
)));
1473 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1475 if (cs
.program_signals_p
&& !cs
.program_signals
[signo
])
1478 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1479 target_pid_to_str (ptid_of (thread
)),
1480 gdb_signal_to_string (signo
));
1483 else if (!cs
.program_signals_p
1484 /* If we have no way to know which signals GDB does not
1485 want to have passed to the program, assume
1486 SIGTRAP/SIGINT, which is GDB's default. */
1487 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1490 debug_printf ("GPS: lwp %s had signal %s, "
1491 "but we don't know if we should pass it. "
1492 "Default to not.\n",
1493 target_pid_to_str (ptid_of (thread
)),
1494 gdb_signal_to_string (signo
));
1500 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1501 target_pid_to_str (ptid_of (thread
)),
1502 gdb_signal_to_string (signo
));
1504 return WSTOPSIG (status
);
1508 /* Detach from LWP. */
1511 linux_detach_one_lwp (struct lwp_info
*lwp
)
1513 struct thread_info
*thread
= get_lwp_thread (lwp
);
1517 /* If there is a pending SIGSTOP, get rid of it. */
1518 if (lwp
->stop_expected
)
1521 debug_printf ("Sending SIGCONT to %s\n",
1522 target_pid_to_str (ptid_of (thread
)));
1524 kill_lwp (lwpid_of (thread
), SIGCONT
);
1525 lwp
->stop_expected
= 0;
1528 /* Pass on any pending signal for this thread. */
1529 sig
= get_detach_signal (thread
);
1531 /* Preparing to resume may try to write registers, and fail if the
1532 lwp is zombie. If that happens, ignore the error. We'll handle
1533 it below, when detach fails with ESRCH. */
1536 /* Flush any pending changes to the process's registers. */
1537 regcache_invalidate_thread (thread
);
1539 /* Finally, let it resume. */
1540 if (the_low_target
.prepare_to_resume
!= NULL
)
1541 the_low_target
.prepare_to_resume (lwp
);
1543 CATCH (ex
, RETURN_MASK_ERROR
)
1545 if (!check_ptrace_stopped_lwp_gone (lwp
))
1546 throw_exception (ex
);
1550 lwpid
= lwpid_of (thread
);
1551 if (ptrace (PTRACE_DETACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0,
1552 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1554 int save_errno
= errno
;
1556 /* We know the thread exists, so ESRCH must mean the lwp is
1557 zombie. This can happen if one of the already-detached
1558 threads exits the whole thread group. In that case we're
1559 still attached, and must reap the lwp. */
1560 if (save_errno
== ESRCH
)
1564 ret
= my_waitpid (lwpid
, &status
, __WALL
);
1567 warning (_("Couldn't reap LWP %d while detaching: %s"),
1568 lwpid
, strerror (errno
));
1570 else if (!WIFEXITED (status
) && !WIFSIGNALED (status
))
1572 warning (_("Reaping LWP %d while detaching "
1573 "returned unexpected status 0x%x"),
1579 error (_("Can't detach %s: %s"),
1580 target_pid_to_str (ptid_of (thread
)),
1581 strerror (save_errno
));
1584 else if (debug_threads
)
1586 debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n",
1587 target_pid_to_str (ptid_of (thread
)),
1594 /* Callback for for_each_thread. Detaches from non-leader threads of a
1598 linux_detach_lwp_callback (thread_info
*thread
)
1600 /* We don't actually detach from the thread group leader just yet.
1601 If the thread group exits, we must reap the zombie clone lwps
1602 before we're able to reap the leader. */
1603 if (thread
->id
.pid () == thread
->id
.lwp ())
1606 lwp_info
*lwp
= get_thread_lwp (thread
);
1607 linux_detach_one_lwp (lwp
);
1611 linux_detach (process_info
*process
)
1613 struct lwp_info
*main_lwp
;
1615 /* As there's a step over already in progress, let it finish first,
1616 otherwise nesting a stabilize_threads operation on top gets real
1618 complete_ongoing_step_over ();
1620 /* Stop all threads before detaching. First, ptrace requires that
1621 the thread is stopped to sucessfully detach. Second, thread_db
1622 may need to uninstall thread event breakpoints from memory, which
1623 only works with a stopped process anyway. */
1624 stop_all_lwps (0, NULL
);
1626 #ifdef USE_THREAD_DB
1627 thread_db_detach (process
);
1630 /* Stabilize threads (move out of jump pads). */
1631 stabilize_threads ();
1633 /* Detach from the clone lwps first. If the thread group exits just
1634 while we're detaching, we must reap the clone lwps before we're
1635 able to reap the leader. */
1636 for_each_thread (process
->pid
, linux_detach_lwp_callback
);
1638 main_lwp
= find_lwp_pid (ptid_t (process
->pid
));
1639 linux_detach_one_lwp (main_lwp
);
1641 the_target
->mourn (process
);
1643 /* Since we presently can only stop all lwps of all processes, we
1644 need to unstop lwps of other processes. */
1645 unstop_all_lwps (0, NULL
);
1649 /* Remove all LWPs that belong to process PROC from the lwp list. */
1652 linux_mourn (struct process_info
*process
)
1654 struct process_info_private
*priv
;
1656 #ifdef USE_THREAD_DB
1657 thread_db_mourn (process
);
1660 for_each_thread (process
->pid
, [] (thread_info
*thread
)
1662 delete_lwp (get_thread_lwp (thread
));
1665 /* Freeing all private data. */
1666 priv
= process
->priv
;
1667 if (the_low_target
.delete_process
!= NULL
)
1668 the_low_target
.delete_process (priv
->arch_private
);
1670 gdb_assert (priv
->arch_private
== NULL
);
1672 process
->priv
= NULL
;
1674 remove_process (process
);
1678 linux_join (int pid
)
1683 ret
= my_waitpid (pid
, &status
, 0);
1684 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1686 } while (ret
!= -1 || errno
!= ECHILD
);
1689 /* Return nonzero if the given thread is still alive. */
1691 linux_thread_alive (ptid_t ptid
)
1693 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1695 /* We assume we always know if a thread exits. If a whole process
1696 exited but we still haven't been able to report it to GDB, we'll
1697 hold on to the last lwp of the dead process. */
1699 return !lwp_is_marked_dead (lwp
);
1704 /* Return 1 if this lwp still has an interesting status pending. If
1705 not (e.g., it had stopped for a breakpoint that is gone), return
1709 thread_still_has_status_pending_p (struct thread_info
*thread
)
1711 struct lwp_info
*lp
= get_thread_lwp (thread
);
1713 if (!lp
->status_pending_p
)
1716 if (thread
->last_resume_kind
!= resume_stop
1717 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1718 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1720 struct thread_info
*saved_thread
;
1724 gdb_assert (lp
->last_status
!= 0);
1728 saved_thread
= current_thread
;
1729 current_thread
= thread
;
1731 if (pc
!= lp
->stop_pc
)
1734 debug_printf ("PC of %ld changed\n",
1739 #if !USE_SIGTRAP_SIGINFO
1740 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1741 && !(*the_low_target
.breakpoint_at
) (pc
))
1744 debug_printf ("previous SW breakpoint of %ld gone\n",
1748 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1749 && !hardware_breakpoint_inserted_here (pc
))
1752 debug_printf ("previous HW breakpoint of %ld gone\n",
1758 current_thread
= saved_thread
;
1763 debug_printf ("discarding pending breakpoint status\n");
1764 lp
->status_pending_p
= 0;
1772 /* Returns true if LWP is resumed from the client's perspective. */
1775 lwp_resumed (struct lwp_info
*lwp
)
1777 struct thread_info
*thread
= get_lwp_thread (lwp
);
1779 if (thread
->last_resume_kind
!= resume_stop
)
1782 /* Did gdb send us a `vCont;t', but we haven't reported the
1783 corresponding stop to gdb yet? If so, the thread is still
1784 resumed/running from gdb's perspective. */
1785 if (thread
->last_resume_kind
== resume_stop
1786 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1792 /* Return true if this lwp has an interesting status pending. */
1794 status_pending_p_callback (thread_info
*thread
, ptid_t ptid
)
1796 struct lwp_info
*lp
= get_thread_lwp (thread
);
1798 /* Check if we're only interested in events from a specific process
1799 or a specific LWP. */
1800 if (!thread
->id
.matches (ptid
))
1803 if (!lwp_resumed (lp
))
1806 if (lp
->status_pending_p
1807 && !thread_still_has_status_pending_p (thread
))
1809 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1813 return lp
->status_pending_p
;
1817 find_lwp_pid (ptid_t ptid
)
1819 thread_info
*thread
= find_thread ([&] (thread_info
*thr_arg
)
1821 int lwp
= ptid
.lwp () != 0 ? ptid
.lwp () : ptid
.pid ();
1822 return thr_arg
->id
.lwp () == lwp
;
1828 return get_thread_lwp (thread
);
1831 /* Return the number of known LWPs in the tgid given by PID. */
1838 for_each_thread (pid
, [&] (thread_info
*thread
)
1846 /* See nat/linux-nat.h. */
1849 iterate_over_lwps (ptid_t filter
,
1850 gdb::function_view
<iterate_over_lwps_ftype
> callback
)
1852 thread_info
*thread
= find_thread (filter
, [&] (thread_info
*thr_arg
)
1854 lwp_info
*lwp
= get_thread_lwp (thr_arg
);
1856 return callback (lwp
);
1862 return get_thread_lwp (thread
);
1865 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1866 their exits until all other threads in the group have exited. */
1869 check_zombie_leaders (void)
1871 for_each_process ([] (process_info
*proc
) {
1872 pid_t leader_pid
= pid_of (proc
);
1873 struct lwp_info
*leader_lp
;
1875 leader_lp
= find_lwp_pid (ptid_t (leader_pid
));
1878 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1879 "num_lwps=%d, zombie=%d\n",
1880 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1881 linux_proc_pid_is_zombie (leader_pid
));
1883 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1884 /* Check if there are other threads in the group, as we may
1885 have raced with the inferior simply exiting. */
1886 && !last_thread_of_process_p (leader_pid
)
1887 && linux_proc_pid_is_zombie (leader_pid
))
1889 /* A leader zombie can mean one of two things:
1891 - It exited, and there's an exit status pending
1892 available, or only the leader exited (not the whole
1893 program). In the latter case, we can't waitpid the
1894 leader's exit status until all other threads are gone.
1896 - There are 3 or more threads in the group, and a thread
1897 other than the leader exec'd. On an exec, the Linux
1898 kernel destroys all other threads (except the execing
1899 one) in the thread group, and resets the execing thread's
1900 tid to the tgid. No exit notification is sent for the
1901 execing thread -- from the ptracer's perspective, it
1902 appears as though the execing thread just vanishes.
1903 Until we reap all other threads except the leader and the
1904 execing thread, the leader will be zombie, and the
1905 execing thread will be in `D (disc sleep)'. As soon as
1906 all other threads are reaped, the execing thread changes
1907 it's tid to the tgid, and the previous (zombie) leader
1908 vanishes, giving place to the "new" leader. We could try
1909 distinguishing the exit and exec cases, by waiting once
1910 more, and seeing if something comes out, but it doesn't
1911 sound useful. The previous leader _does_ go away, and
1912 we'll re-add the new one once we see the exec event
1913 (which is just the same as what would happen if the
1914 previous leader did exit voluntarily before some other
1918 debug_printf ("CZL: Thread group leader %d zombie "
1919 "(it exited, or another thread execd).\n",
1922 delete_lwp (leader_lp
);
1927 /* Callback for `find_thread'. Returns the first LWP that is not
1931 not_stopped_callback (thread_info
*thread
, ptid_t filter
)
1933 if (!thread
->id
.matches (filter
))
1936 lwp_info
*lwp
= get_thread_lwp (thread
);
1938 return !lwp
->stopped
;
1941 /* Increment LWP's suspend count. */
1944 lwp_suspended_inc (struct lwp_info
*lwp
)
1948 if (debug_threads
&& lwp
->suspended
> 4)
1950 struct thread_info
*thread
= get_lwp_thread (lwp
);
1952 debug_printf ("LWP %ld has a suspiciously high suspend count,"
1953 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
1957 /* Decrement LWP's suspend count. */
1960 lwp_suspended_decr (struct lwp_info
*lwp
)
1964 if (lwp
->suspended
< 0)
1966 struct thread_info
*thread
= get_lwp_thread (lwp
);
1968 internal_error (__FILE__
, __LINE__
,
1969 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
1974 /* This function should only be called if the LWP got a SIGTRAP.
1976 Handle any tracepoint steps or hits. Return true if a tracepoint
1977 event was handled, 0 otherwise. */
1980 handle_tracepoints (struct lwp_info
*lwp
)
1982 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1983 int tpoint_related_event
= 0;
1985 gdb_assert (lwp
->suspended
== 0);
1987 /* If this tracepoint hit causes a tracing stop, we'll immediately
1988 uninsert tracepoints. To do this, we temporarily pause all
1989 threads, unpatch away, and then unpause threads. We need to make
1990 sure the unpausing doesn't resume LWP too. */
1991 lwp_suspended_inc (lwp
);
1993 /* And we need to be sure that any all-threads-stopping doesn't try
1994 to move threads out of the jump pads, as it could deadlock the
1995 inferior (LWP could be in the jump pad, maybe even holding the
1998 /* Do any necessary step collect actions. */
1999 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2001 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2003 /* See if we just hit a tracepoint and do its main collect
2005 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2007 lwp_suspended_decr (lwp
);
2009 gdb_assert (lwp
->suspended
== 0);
2010 gdb_assert (!stabilizing_threads
2011 || (lwp
->collecting_fast_tracepoint
2012 != fast_tpoint_collect_result::not_collecting
));
2014 if (tpoint_related_event
)
2017 debug_printf ("got a tracepoint event\n");
2024 /* Convenience wrapper. Returns information about LWP's fast tracepoint
2025 collection status. */
2027 static fast_tpoint_collect_result
2028 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2029 struct fast_tpoint_collect_status
*status
)
2031 CORE_ADDR thread_area
;
2032 struct thread_info
*thread
= get_lwp_thread (lwp
);
2034 if (the_low_target
.get_thread_area
== NULL
)
2035 return fast_tpoint_collect_result::not_collecting
;
2037 /* Get the thread area address. This is used to recognize which
2038 thread is which when tracing with the in-process agent library.
2039 We don't read anything from the address, and treat it as opaque;
2040 it's the address itself that we assume is unique per-thread. */
2041 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2042 return fast_tpoint_collect_result::not_collecting
;
2044 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2047 /* The reason we resume in the caller, is because we want to be able
2048 to pass lwp->status_pending as WSTAT, and we need to clear
2049 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2050 refuses to resume. */
2053 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2055 struct thread_info
*saved_thread
;
2057 saved_thread
= current_thread
;
2058 current_thread
= get_lwp_thread (lwp
);
2061 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2062 && supports_fast_tracepoints ()
2063 && agent_loaded_p ())
2065 struct fast_tpoint_collect_status status
;
2068 debug_printf ("Checking whether LWP %ld needs to move out of the "
2070 lwpid_of (current_thread
));
2072 fast_tpoint_collect_result r
2073 = linux_fast_tracepoint_collecting (lwp
, &status
);
2076 || (WSTOPSIG (*wstat
) != SIGILL
2077 && WSTOPSIG (*wstat
) != SIGFPE
2078 && WSTOPSIG (*wstat
) != SIGSEGV
2079 && WSTOPSIG (*wstat
) != SIGBUS
))
2081 lwp
->collecting_fast_tracepoint
= r
;
2083 if (r
!= fast_tpoint_collect_result::not_collecting
)
2085 if (r
== fast_tpoint_collect_result::before_insn
2086 && lwp
->exit_jump_pad_bkpt
== NULL
)
2088 /* Haven't executed the original instruction yet.
2089 Set breakpoint there, and wait till it's hit,
2090 then single-step until exiting the jump pad. */
2091 lwp
->exit_jump_pad_bkpt
2092 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2096 debug_printf ("Checking whether LWP %ld needs to move out of "
2097 "the jump pad...it does\n",
2098 lwpid_of (current_thread
));
2099 current_thread
= saved_thread
;
2106 /* If we get a synchronous signal while collecting, *and*
2107 while executing the (relocated) original instruction,
2108 reset the PC to point at the tpoint address, before
2109 reporting to GDB. Otherwise, it's an IPA lib bug: just
2110 report the signal to GDB, and pray for the best. */
2112 lwp
->collecting_fast_tracepoint
2113 = fast_tpoint_collect_result::not_collecting
;
2115 if (r
!= fast_tpoint_collect_result::not_collecting
2116 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2117 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2120 struct regcache
*regcache
;
2122 /* The si_addr on a few signals references the address
2123 of the faulting instruction. Adjust that as
2125 if ((WSTOPSIG (*wstat
) == SIGILL
2126 || WSTOPSIG (*wstat
) == SIGFPE
2127 || WSTOPSIG (*wstat
) == SIGBUS
2128 || WSTOPSIG (*wstat
) == SIGSEGV
)
2129 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2130 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2131 /* Final check just to make sure we don't clobber
2132 the siginfo of non-kernel-sent signals. */
2133 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2135 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2136 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2137 (PTRACE_TYPE_ARG3
) 0, &info
);
2140 regcache
= get_thread_regcache (current_thread
, 1);
2141 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2142 lwp
->stop_pc
= status
.tpoint_addr
;
2144 /* Cancel any fast tracepoint lock this thread was
2146 force_unlock_trace_buffer ();
2149 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2152 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2153 "stopping all threads momentarily.\n");
2155 stop_all_lwps (1, lwp
);
2157 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2158 lwp
->exit_jump_pad_bkpt
= NULL
;
2160 unstop_all_lwps (1, lwp
);
2162 gdb_assert (lwp
->suspended
>= 0);
2168 debug_printf ("Checking whether LWP %ld needs to move out of the "
2170 lwpid_of (current_thread
));
2172 current_thread
= saved_thread
;
2176 /* Enqueue one signal in the "signals to report later when out of the
2180 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2182 struct pending_signals
*p_sig
;
2183 struct thread_info
*thread
= get_lwp_thread (lwp
);
2186 debug_printf ("Deferring signal %d for LWP %ld.\n",
2187 WSTOPSIG (*wstat
), lwpid_of (thread
));
2191 struct pending_signals
*sig
;
2193 for (sig
= lwp
->pending_signals_to_report
;
2196 debug_printf (" Already queued %d\n",
2199 debug_printf (" (no more currently queued signals)\n");
2202 /* Don't enqueue non-RT signals if they are already in the deferred
2203 queue. (SIGSTOP being the easiest signal to see ending up here
2205 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2207 struct pending_signals
*sig
;
2209 for (sig
= lwp
->pending_signals_to_report
;
2213 if (sig
->signal
== WSTOPSIG (*wstat
))
2216 debug_printf ("Not requeuing already queued non-RT signal %d"
2225 p_sig
= XCNEW (struct pending_signals
);
2226 p_sig
->prev
= lwp
->pending_signals_to_report
;
2227 p_sig
->signal
= WSTOPSIG (*wstat
);
2229 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2232 lwp
->pending_signals_to_report
= p_sig
;
2235 /* Dequeue one signal from the "signals to report later when out of
2236 the jump pad" list. */
2239 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2241 struct thread_info
*thread
= get_lwp_thread (lwp
);
2243 if (lwp
->pending_signals_to_report
!= NULL
)
2245 struct pending_signals
**p_sig
;
2247 p_sig
= &lwp
->pending_signals_to_report
;
2248 while ((*p_sig
)->prev
!= NULL
)
2249 p_sig
= &(*p_sig
)->prev
;
2251 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2252 if ((*p_sig
)->info
.si_signo
!= 0)
2253 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2259 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2260 WSTOPSIG (*wstat
), lwpid_of (thread
));
2264 struct pending_signals
*sig
;
2266 for (sig
= lwp
->pending_signals_to_report
;
2269 debug_printf (" Still queued %d\n",
2272 debug_printf (" (no more queued signals)\n");
2281 /* Fetch the possibly triggered data watchpoint info and store it in
2284 On some archs, like x86, that use debug registers to set
2285 watchpoints, it's possible that the way to know which watched
2286 address trapped, is to check the register that is used to select
2287 which address to watch. Problem is, between setting the watchpoint
2288 and reading back which data address trapped, the user may change
2289 the set of watchpoints, and, as a consequence, GDB changes the
2290 debug registers in the inferior. To avoid reading back a stale
2291 stopped-data-address when that happens, we cache in LP the fact
2292 that a watchpoint trapped, and the corresponding data address, as
2293 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2294 registers meanwhile, we have the cached data we can rely on. */
2297 check_stopped_by_watchpoint (struct lwp_info
*child
)
2299 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2301 struct thread_info
*saved_thread
;
2303 saved_thread
= current_thread
;
2304 current_thread
= get_lwp_thread (child
);
2306 if (the_low_target
.stopped_by_watchpoint ())
2308 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2310 if (the_low_target
.stopped_data_address
!= NULL
)
2311 child
->stopped_data_address
2312 = the_low_target
.stopped_data_address ();
2314 child
->stopped_data_address
= 0;
2317 current_thread
= saved_thread
;
2320 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2323 /* Return the ptrace options that we want to try to enable. */
2326 linux_low_ptrace_options (int attached
)
2328 client_state
&cs
= get_client_state ();
2332 options
|= PTRACE_O_EXITKILL
;
2334 if (cs
.report_fork_events
)
2335 options
|= PTRACE_O_TRACEFORK
;
2337 if (cs
.report_vfork_events
)
2338 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2340 if (cs
.report_exec_events
)
2341 options
|= PTRACE_O_TRACEEXEC
;
2343 options
|= PTRACE_O_TRACESYSGOOD
;
2348 /* Do low-level handling of the event, and check if we should go on
2349 and pass it to caller code. Return the affected lwp if we are, or
2352 static struct lwp_info
*
2353 linux_low_filter_event (int lwpid
, int wstat
)
2355 client_state
&cs
= get_client_state ();
2356 struct lwp_info
*child
;
2357 struct thread_info
*thread
;
2358 int have_stop_pc
= 0;
2360 child
= find_lwp_pid (ptid_t (lwpid
));
2362 /* Check for stop events reported by a process we didn't already
2363 know about - anything not already in our LWP list.
2365 If we're expecting to receive stopped processes after
2366 fork, vfork, and clone events, then we'll just add the
2367 new one to our list and go back to waiting for the event
2368 to be reported - the stopped process might be returned
2369 from waitpid before or after the event is.
2371 But note the case of a non-leader thread exec'ing after the
2372 leader having exited, and gone from our lists (because
2373 check_zombie_leaders deleted it). The non-leader thread
2374 changes its tid to the tgid. */
2376 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2377 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2381 /* A multi-thread exec after we had seen the leader exiting. */
2384 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2385 "after exec.\n", lwpid
);
2388 child_ptid
= ptid_t (lwpid
, lwpid
, 0);
2389 child
= add_lwp (child_ptid
);
2391 current_thread
= child
->thread
;
2394 /* If we didn't find a process, one of two things presumably happened:
2395 - A process we started and then detached from has exited. Ignore it.
2396 - A process we are controlling has forked and the new child's stop
2397 was reported to us by the kernel. Save its PID. */
2398 if (child
== NULL
&& WIFSTOPPED (wstat
))
2400 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2403 else if (child
== NULL
)
2406 thread
= get_lwp_thread (child
);
2410 child
->last_status
= wstat
;
2412 /* Check if the thread has exited. */
2413 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2416 debug_printf ("LLFE: %d exited.\n", lwpid
);
2418 if (finish_step_over (child
))
2420 /* Unsuspend all other LWPs, and set them back running again. */
2421 unsuspend_all_lwps (child
);
2424 /* If there is at least one more LWP, then the exit signal was
2425 not the end of the debugged application and should be
2426 ignored, unless GDB wants to hear about thread exits. */
2427 if (cs
.report_thread_events
2428 || last_thread_of_process_p (pid_of (thread
)))
2430 /* Since events are serialized to GDB core, and we can't
2431 report this one right now. Leave the status pending for
2432 the next time we're able to report it. */
2433 mark_lwp_dead (child
, wstat
);
2443 gdb_assert (WIFSTOPPED (wstat
));
2445 if (WIFSTOPPED (wstat
))
2447 struct process_info
*proc
;
2449 /* Architecture-specific setup after inferior is running. */
2450 proc
= find_process_pid (pid_of (thread
));
2451 if (proc
->tdesc
== NULL
)
2455 /* This needs to happen after we have attached to the
2456 inferior and it is stopped for the first time, but
2457 before we access any inferior registers. */
2458 linux_arch_setup_thread (thread
);
2462 /* The process is started, but GDBserver will do
2463 architecture-specific setup after the program stops at
2464 the first instruction. */
2465 child
->status_pending_p
= 1;
2466 child
->status_pending
= wstat
;
2472 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2474 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2475 int options
= linux_low_ptrace_options (proc
->attached
);
2477 linux_enable_event_reporting (lwpid
, options
);
2478 child
->must_set_ptrace_flags
= 0;
2481 /* Always update syscall_state, even if it will be filtered later. */
2482 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2484 child
->syscall_state
2485 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2486 ? TARGET_WAITKIND_SYSCALL_RETURN
2487 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2491 /* Almost all other ptrace-stops are known to be outside of system
2492 calls, with further exceptions in handle_extended_wait. */
2493 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2496 /* Be careful to not overwrite stop_pc until save_stop_reason is
2498 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2499 && linux_is_extended_waitstatus (wstat
))
2501 child
->stop_pc
= get_pc (child
);
2502 if (handle_extended_wait (&child
, wstat
))
2504 /* The event has been handled, so just return without
2510 if (linux_wstatus_maybe_breakpoint (wstat
))
2512 if (save_stop_reason (child
))
2517 child
->stop_pc
= get_pc (child
);
2519 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2520 && child
->stop_expected
)
2523 debug_printf ("Expected stop.\n");
2524 child
->stop_expected
= 0;
2526 if (thread
->last_resume_kind
== resume_stop
)
2528 /* We want to report the stop to the core. Treat the
2529 SIGSTOP as a normal event. */
2531 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2532 target_pid_to_str (ptid_of (thread
)));
2534 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2536 /* Stopping threads. We don't want this SIGSTOP to end up
2539 debug_printf ("LLW: SIGSTOP caught for %s "
2540 "while stopping threads.\n",
2541 target_pid_to_str (ptid_of (thread
)));
2546 /* This is a delayed SIGSTOP. Filter out the event. */
2548 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2549 child
->stepping
? "step" : "continue",
2550 target_pid_to_str (ptid_of (thread
)));
2552 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2557 child
->status_pending_p
= 1;
2558 child
->status_pending
= wstat
;
2562 /* Return true if THREAD is doing hardware single step. */
2565 maybe_hw_step (struct thread_info
*thread
)
2567 if (can_hardware_single_step ())
2571 /* GDBserver must insert single-step breakpoint for software
2573 gdb_assert (has_single_step_breakpoints (thread
));
2578 /* Resume LWPs that are currently stopped without any pending status
2579 to report, but are resumed from the core's perspective. */
2582 resume_stopped_resumed_lwps (thread_info
*thread
)
2584 struct lwp_info
*lp
= get_thread_lwp (thread
);
2588 && !lp
->status_pending_p
2589 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2593 if (thread
->last_resume_kind
== resume_step
)
2594 step
= maybe_hw_step (thread
);
2597 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2598 target_pid_to_str (ptid_of (thread
)),
2599 paddress (lp
->stop_pc
),
2602 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2606 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2607 match FILTER_PTID (leaving others pending). The PTIDs can be:
2608 minus_one_ptid, to specify any child; a pid PTID, specifying all
2609 lwps of a thread group; or a PTID representing a single lwp. Store
2610 the stop status through the status pointer WSTAT. OPTIONS is
2611 passed to the waitpid call. Return 0 if no event was found and
2612 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2613 was found. Return the PID of the stopped child otherwise. */
2616 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2617 int *wstatp
, int options
)
2619 struct thread_info
*event_thread
;
2620 struct lwp_info
*event_child
, *requested_child
;
2621 sigset_t block_mask
, prev_mask
;
2624 /* N.B. event_thread points to the thread_info struct that contains
2625 event_child. Keep them in sync. */
2626 event_thread
= NULL
;
2628 requested_child
= NULL
;
2630 /* Check for a lwp with a pending status. */
2632 if (filter_ptid
== minus_one_ptid
|| filter_ptid
.is_pid ())
2634 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2636 return status_pending_p_callback (thread
, filter_ptid
);
2639 if (event_thread
!= NULL
)
2640 event_child
= get_thread_lwp (event_thread
);
2641 if (debug_threads
&& event_thread
)
2642 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2644 else if (filter_ptid
!= null_ptid
)
2646 requested_child
= find_lwp_pid (filter_ptid
);
2648 if (stopping_threads
== NOT_STOPPING_THREADS
2649 && requested_child
->status_pending_p
2650 && (requested_child
->collecting_fast_tracepoint
2651 != fast_tpoint_collect_result::not_collecting
))
2653 enqueue_one_deferred_signal (requested_child
,
2654 &requested_child
->status_pending
);
2655 requested_child
->status_pending_p
= 0;
2656 requested_child
->status_pending
= 0;
2657 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2660 if (requested_child
->suspended
2661 && requested_child
->status_pending_p
)
2663 internal_error (__FILE__
, __LINE__
,
2664 "requesting an event out of a"
2665 " suspended child?");
2668 if (requested_child
->status_pending_p
)
2670 event_child
= requested_child
;
2671 event_thread
= get_lwp_thread (event_child
);
2675 if (event_child
!= NULL
)
2678 debug_printf ("Got an event from pending child %ld (%04x)\n",
2679 lwpid_of (event_thread
), event_child
->status_pending
);
2680 *wstatp
= event_child
->status_pending
;
2681 event_child
->status_pending_p
= 0;
2682 event_child
->status_pending
= 0;
2683 current_thread
= event_thread
;
2684 return lwpid_of (event_thread
);
2687 /* But if we don't find a pending event, we'll have to wait.
2689 We only enter this loop if no process has a pending wait status.
2690 Thus any action taken in response to a wait status inside this
2691 loop is responding as soon as we detect the status, not after any
2694 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2695 all signals while here. */
2696 sigfillset (&block_mask
);
2697 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2699 /* Always pull all events out of the kernel. We'll randomly select
2700 an event LWP out of all that have events, to prevent
2702 while (event_child
== NULL
)
2706 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2709 - If the thread group leader exits while other threads in the
2710 thread group still exist, waitpid(TGID, ...) hangs. That
2711 waitpid won't return an exit status until the other threads
2712 in the group are reaped.
2714 - When a non-leader thread execs, that thread just vanishes
2715 without reporting an exit (so we'd hang if we waited for it
2716 explicitly in that case). The exec event is reported to
2719 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2722 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2723 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2729 debug_printf ("LLW: waitpid %ld received %s\n",
2730 (long) ret
, status_to_str (*wstatp
));
2733 /* Filter all events. IOW, leave all events pending. We'll
2734 randomly select an event LWP out of all that have events
2736 linux_low_filter_event (ret
, *wstatp
);
2737 /* Retry until nothing comes out of waitpid. A single
2738 SIGCHLD can indicate more than one child stopped. */
2742 /* Now that we've pulled all events out of the kernel, resume
2743 LWPs that don't have an interesting event to report. */
2744 if (stopping_threads
== NOT_STOPPING_THREADS
)
2745 for_each_thread (resume_stopped_resumed_lwps
);
2747 /* ... and find an LWP with a status to report to the core, if
2749 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2751 return status_pending_p_callback (thread
, filter_ptid
);
2754 if (event_thread
!= NULL
)
2756 event_child
= get_thread_lwp (event_thread
);
2757 *wstatp
= event_child
->status_pending
;
2758 event_child
->status_pending_p
= 0;
2759 event_child
->status_pending
= 0;
2763 /* Check for zombie thread group leaders. Those can't be reaped
2764 until all other threads in the thread group are. */
2765 check_zombie_leaders ();
2767 auto not_stopped
= [&] (thread_info
*thread
)
2769 return not_stopped_callback (thread
, wait_ptid
);
2772 /* If there are no resumed children left in the set of LWPs we
2773 want to wait for, bail. We can't just block in
2774 waitpid/sigsuspend, because lwps might have been left stopped
2775 in trace-stop state, and we'd be stuck forever waiting for
2776 their status to change (which would only happen if we resumed
2777 them). Even if WNOHANG is set, this return code is preferred
2778 over 0 (below), as it is more detailed. */
2779 if (find_thread (not_stopped
) == NULL
)
2782 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2783 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2787 /* No interesting event to report to the caller. */
2788 if ((options
& WNOHANG
))
2791 debug_printf ("WNOHANG set, no event found\n");
2793 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2797 /* Block until we get an event reported with SIGCHLD. */
2799 debug_printf ("sigsuspend'ing\n");
2801 sigsuspend (&prev_mask
);
2802 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2806 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2808 current_thread
= event_thread
;
2810 return lwpid_of (event_thread
);
2813 /* Wait for an event from child(ren) PTID. PTIDs can be:
2814 minus_one_ptid, to specify any child; a pid PTID, specifying all
2815 lwps of a thread group; or a PTID representing a single lwp. Store
2816 the stop status through the status pointer WSTAT. OPTIONS is
2817 passed to the waitpid call. Return 0 if no event was found and
2818 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2819 was found. Return the PID of the stopped child otherwise. */
2822 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2824 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2827 /* Select one LWP out of those that have events pending. */
2830 select_event_lwp (struct lwp_info
**orig_lp
)
2832 int random_selector
;
2833 struct thread_info
*event_thread
= NULL
;
2835 /* In all-stop, give preference to the LWP that is being
2836 single-stepped. There will be at most one, and it's the LWP that
2837 the core is most interested in. If we didn't do this, then we'd
2838 have to handle pending step SIGTRAPs somehow in case the core
2839 later continues the previously-stepped thread, otherwise we'd
2840 report the pending SIGTRAP, and the core, not having stepped the
2841 thread, wouldn't understand what the trap was for, and therefore
2842 would report it to the user as a random signal. */
2845 event_thread
= find_thread ([] (thread_info
*thread
)
2847 lwp_info
*lp
= get_thread_lwp (thread
);
2849 return (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2850 && thread
->last_resume_kind
== resume_step
2851 && lp
->status_pending_p
);
2854 if (event_thread
!= NULL
)
2857 debug_printf ("SEL: Select single-step %s\n",
2858 target_pid_to_str (ptid_of (event_thread
)));
2861 if (event_thread
== NULL
)
2863 /* No single-stepping LWP. Select one at random, out of those
2864 which have had events. */
2866 /* First see how many events we have. */
2868 for_each_thread ([&] (thread_info
*thread
)
2870 lwp_info
*lp
= get_thread_lwp (thread
);
2872 /* Count only resumed LWPs that have an event pending. */
2873 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2874 && lp
->status_pending_p
)
2877 gdb_assert (num_events
> 0);
2879 /* Now randomly pick a LWP out of those that have had
2881 random_selector
= (int)
2882 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2884 if (debug_threads
&& num_events
> 1)
2885 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2886 num_events
, random_selector
);
2888 event_thread
= find_thread ([&] (thread_info
*thread
)
2890 lwp_info
*lp
= get_thread_lwp (thread
);
2892 /* Select only resumed LWPs that have an event pending. */
2893 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2894 && lp
->status_pending_p
)
2895 if (random_selector
-- == 0)
2902 if (event_thread
!= NULL
)
2904 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2906 /* Switch the event LWP. */
2907 *orig_lp
= event_lp
;
2911 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2915 unsuspend_all_lwps (struct lwp_info
*except
)
2917 for_each_thread ([&] (thread_info
*thread
)
2919 lwp_info
*lwp
= get_thread_lwp (thread
);
2922 lwp_suspended_decr (lwp
);
2926 static void move_out_of_jump_pad_callback (thread_info
*thread
);
2927 static bool stuck_in_jump_pad_callback (thread_info
*thread
);
2928 static bool lwp_running (thread_info
*thread
);
2929 static ptid_t
linux_wait_1 (ptid_t ptid
,
2930 struct target_waitstatus
*ourstatus
,
2931 int target_options
);
2933 /* Stabilize threads (move out of jump pads).
2935 If a thread is midway collecting a fast tracepoint, we need to
2936 finish the collection and move it out of the jump pad before
2937 reporting the signal.
2939 This avoids recursion while collecting (when a signal arrives
2940 midway, and the signal handler itself collects), which would trash
2941 the trace buffer. In case the user set a breakpoint in a signal
2942 handler, this avoids the backtrace showing the jump pad, etc..
2943 Most importantly, there are certain things we can't do safely if
2944 threads are stopped in a jump pad (or in its callee's). For
2947 - starting a new trace run. A thread still collecting the
2948 previous run, could trash the trace buffer when resumed. The trace
2949 buffer control structures would have been reset but the thread had
2950 no way to tell. The thread could even midway memcpy'ing to the
2951 buffer, which would mean that when resumed, it would clobber the
2952 trace buffer that had been set for a new run.
2954 - we can't rewrite/reuse the jump pads for new tracepoints
2955 safely. Say you do tstart while a thread is stopped midway while
2956 collecting. When the thread is later resumed, it finishes the
2957 collection, and returns to the jump pad, to execute the original
2958 instruction that was under the tracepoint jump at the time the
2959 older run had been started. If the jump pad had been rewritten
2960 since for something else in the new run, the thread would now
2961 execute the wrong / random instructions. */
2964 linux_stabilize_threads (void)
2966 thread_info
*thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
2968 if (thread_stuck
!= NULL
)
2971 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2972 lwpid_of (thread_stuck
));
2976 thread_info
*saved_thread
= current_thread
;
2978 stabilizing_threads
= 1;
2981 for_each_thread (move_out_of_jump_pad_callback
);
2983 /* Loop until all are stopped out of the jump pads. */
2984 while (find_thread (lwp_running
) != NULL
)
2986 struct target_waitstatus ourstatus
;
2987 struct lwp_info
*lwp
;
2990 /* Note that we go through the full wait even loop. While
2991 moving threads out of jump pad, we need to be able to step
2992 over internal breakpoints and such. */
2993 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2995 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2997 lwp
= get_thread_lwp (current_thread
);
3000 lwp_suspended_inc (lwp
);
3002 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3003 || current_thread
->last_resume_kind
== resume_stop
)
3005 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3006 enqueue_one_deferred_signal (lwp
, &wstat
);
3011 unsuspend_all_lwps (NULL
);
3013 stabilizing_threads
= 0;
3015 current_thread
= saved_thread
;
3019 thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
3021 if (thread_stuck
!= NULL
)
3022 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3023 lwpid_of (thread_stuck
));
3027 /* Convenience function that is called when the kernel reports an
3028 event that is not passed out to GDB. */
3031 ignore_event (struct target_waitstatus
*ourstatus
)
3033 /* If we got an event, there may still be others, as a single
3034 SIGCHLD can indicate more than one child stopped. This forces
3035 another target_wait call. */
3038 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3042 /* Convenience function that is called when the kernel reports an exit
3043 event. This decides whether to report the event to GDB as a
3044 process exit event, a thread exit event, or to suppress the
3048 filter_exit_event (struct lwp_info
*event_child
,
3049 struct target_waitstatus
*ourstatus
)
3051 client_state
&cs
= get_client_state ();
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 (cs
.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
)
3109 client_state
&cs
= get_client_state ();
3111 struct lwp_info
*event_child
;
3114 int step_over_finished
;
3115 int bp_explains_trap
;
3116 int maybe_internal_trap
;
3125 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3128 /* Translate generic target options into linux options. */
3130 if (target_options
& TARGET_WNOHANG
)
3133 bp_explains_trap
= 0;
3136 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3138 auto status_pending_p_any
= [&] (thread_info
*thread
)
3140 return status_pending_p_callback (thread
, minus_one_ptid
);
3143 auto not_stopped
= [&] (thread_info
*thread
)
3145 return not_stopped_callback (thread
, minus_one_ptid
);
3148 /* Find a resumed LWP, if any. */
3149 if (find_thread (status_pending_p_any
) != NULL
)
3151 else if (find_thread (not_stopped
) != NULL
)
3156 if (step_over_bkpt
== null_ptid
)
3157 pid
= linux_wait_for_event (ptid
, &w
, options
);
3161 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3162 target_pid_to_str (step_over_bkpt
));
3163 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3166 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3168 gdb_assert (target_options
& TARGET_WNOHANG
);
3172 debug_printf ("linux_wait_1 ret = null_ptid, "
3173 "TARGET_WAITKIND_IGNORE\n");
3177 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3184 debug_printf ("linux_wait_1 ret = null_ptid, "
3185 "TARGET_WAITKIND_NO_RESUMED\n");
3189 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3193 event_child
= get_thread_lwp (current_thread
);
3195 /* linux_wait_for_event only returns an exit status for the last
3196 child of a process. Report it. */
3197 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3201 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3202 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3206 debug_printf ("linux_wait_1 ret = %s, exited with "
3208 target_pid_to_str (ptid_of (current_thread
)),
3215 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3216 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3220 debug_printf ("linux_wait_1 ret = %s, terminated with "
3222 target_pid_to_str (ptid_of (current_thread
)),
3228 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3229 return filter_exit_event (event_child
, ourstatus
);
3231 return ptid_of (current_thread
);
3234 /* If step-over executes a breakpoint instruction, in the case of a
3235 hardware single step it means a gdb/gdbserver breakpoint had been
3236 planted on top of a permanent breakpoint, in the case of a software
3237 single step it may just mean that gdbserver hit the reinsert breakpoint.
3238 The PC has been adjusted by save_stop_reason to point at
3239 the breakpoint address.
3240 So in the case of the hardware single step advance the PC manually
3241 past the breakpoint and in the case of software single step advance only
3242 if it's not the single_step_breakpoint we are hitting.
3243 This avoids that a program would keep trapping a permanent breakpoint
3245 if (step_over_bkpt
!= null_ptid
3246 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3247 && (event_child
->stepping
3248 || !single_step_breakpoint_inserted_here (event_child
->stop_pc
)))
3250 int increment_pc
= 0;
3251 int breakpoint_kind
= 0;
3252 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3255 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3256 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3260 debug_printf ("step-over for %s executed software breakpoint\n",
3261 target_pid_to_str (ptid_of (current_thread
)));
3264 if (increment_pc
!= 0)
3266 struct regcache
*regcache
3267 = get_thread_regcache (current_thread
, 1);
3269 event_child
->stop_pc
+= increment_pc
;
3270 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3272 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3273 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3277 /* If this event was not handled before, and is not a SIGTRAP, we
3278 report it. SIGILL and SIGSEGV are also treated as traps in case
3279 a breakpoint is inserted at the current PC. If this target does
3280 not support internal breakpoints at all, we also report the
3281 SIGTRAP without further processing; it's of no concern to us. */
3283 = (supports_breakpoints ()
3284 && (WSTOPSIG (w
) == SIGTRAP
3285 || ((WSTOPSIG (w
) == SIGILL
3286 || WSTOPSIG (w
) == SIGSEGV
)
3287 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3289 if (maybe_internal_trap
)
3291 /* Handle anything that requires bookkeeping before deciding to
3292 report the event or continue waiting. */
3294 /* First check if we can explain the SIGTRAP with an internal
3295 breakpoint, or if we should possibly report the event to GDB.
3296 Do this before anything that may remove or insert a
3298 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3300 /* We have a SIGTRAP, possibly a step-over dance has just
3301 finished. If so, tweak the state machine accordingly,
3302 reinsert breakpoints and delete any single-step
3304 step_over_finished
= finish_step_over (event_child
);
3306 /* Now invoke the callbacks of any internal breakpoints there. */
3307 check_breakpoints (event_child
->stop_pc
);
3309 /* Handle tracepoint data collecting. This may overflow the
3310 trace buffer, and cause a tracing stop, removing
3312 trace_event
= handle_tracepoints (event_child
);
3314 if (bp_explains_trap
)
3317 debug_printf ("Hit a gdbserver breakpoint.\n");
3322 /* We have some other signal, possibly a step-over dance was in
3323 progress, and it should be cancelled too. */
3324 step_over_finished
= finish_step_over (event_child
);
3327 /* We have all the data we need. Either report the event to GDB, or
3328 resume threads and keep waiting for more. */
3330 /* If we're collecting a fast tracepoint, finish the collection and
3331 move out of the jump pad before delivering a signal. See
3332 linux_stabilize_threads. */
3335 && WSTOPSIG (w
) != SIGTRAP
3336 && supports_fast_tracepoints ()
3337 && agent_loaded_p ())
3340 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3341 "to defer or adjust it.\n",
3342 WSTOPSIG (w
), lwpid_of (current_thread
));
3344 /* Allow debugging the jump pad itself. */
3345 if (current_thread
->last_resume_kind
!= resume_step
3346 && maybe_move_out_of_jump_pad (event_child
, &w
))
3348 enqueue_one_deferred_signal (event_child
, &w
);
3351 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3352 WSTOPSIG (w
), lwpid_of (current_thread
));
3354 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3358 return ignore_event (ourstatus
);
3362 if (event_child
->collecting_fast_tracepoint
3363 != fast_tpoint_collect_result::not_collecting
)
3366 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3367 "Check if we're already there.\n",
3368 lwpid_of (current_thread
),
3369 (int) event_child
->collecting_fast_tracepoint
);
3373 event_child
->collecting_fast_tracepoint
3374 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3376 if (event_child
->collecting_fast_tracepoint
3377 != fast_tpoint_collect_result::before_insn
)
3379 /* No longer need this breakpoint. */
3380 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3383 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3384 "stopping all threads momentarily.\n");
3386 /* Other running threads could hit this breakpoint.
3387 We don't handle moribund locations like GDB does,
3388 instead we always pause all threads when removing
3389 breakpoints, so that any step-over or
3390 decr_pc_after_break adjustment is always taken
3391 care of while the breakpoint is still
3393 stop_all_lwps (1, event_child
);
3395 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3396 event_child
->exit_jump_pad_bkpt
= NULL
;
3398 unstop_all_lwps (1, event_child
);
3400 gdb_assert (event_child
->suspended
>= 0);
3404 if (event_child
->collecting_fast_tracepoint
3405 == fast_tpoint_collect_result::not_collecting
)
3408 debug_printf ("fast tracepoint finished "
3409 "collecting successfully.\n");
3411 /* We may have a deferred signal to report. */
3412 if (dequeue_one_deferred_signal (event_child
, &w
))
3415 debug_printf ("dequeued one signal.\n");
3420 debug_printf ("no deferred signals.\n");
3422 if (stabilizing_threads
)
3424 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3425 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3429 debug_printf ("linux_wait_1 ret = %s, stopped "
3430 "while stabilizing threads\n",
3431 target_pid_to_str (ptid_of (current_thread
)));
3435 return ptid_of (current_thread
);
3441 /* Check whether GDB would be interested in this event. */
3443 /* Check if GDB is interested in this syscall. */
3445 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3446 && !gdb_catch_this_syscall_p (event_child
))
3450 debug_printf ("Ignored syscall for LWP %ld.\n",
3451 lwpid_of (current_thread
));
3454 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3459 return ignore_event (ourstatus
);
3462 /* If GDB is not interested in this signal, don't stop other
3463 threads, and don't report it to GDB. Just resume the inferior
3464 right away. We do this for threading-related signals as well as
3465 any that GDB specifically requested we ignore. But never ignore
3466 SIGSTOP if we sent it ourselves, and do not ignore signals when
3467 stepping - they may require special handling to skip the signal
3468 handler. Also never ignore signals that could be caused by a
3471 && current_thread
->last_resume_kind
!= resume_step
3473 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3474 (current_process ()->priv
->thread_db
!= NULL
3475 && (WSTOPSIG (w
) == __SIGRTMIN
3476 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3479 (cs
.pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3480 && !(WSTOPSIG (w
) == SIGSTOP
3481 && current_thread
->last_resume_kind
== resume_stop
)
3482 && !linux_wstatus_maybe_breakpoint (w
))))
3484 siginfo_t info
, *info_p
;
3487 debug_printf ("Ignored signal %d for LWP %ld.\n",
3488 WSTOPSIG (w
), lwpid_of (current_thread
));
3490 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3491 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3496 if (step_over_finished
)
3498 /* We cancelled this thread's step-over above. We still
3499 need to unsuspend all other LWPs, and set them back
3500 running again while the signal handler runs. */
3501 unsuspend_all_lwps (event_child
);
3503 /* Enqueue the pending signal info so that proceed_all_lwps
3505 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3507 proceed_all_lwps ();
3511 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3512 WSTOPSIG (w
), info_p
);
3518 return ignore_event (ourstatus
);
3521 /* Note that all addresses are always "out of the step range" when
3522 there's no range to begin with. */
3523 in_step_range
= lwp_in_step_range (event_child
);
3525 /* If GDB wanted this thread to single step, and the thread is out
3526 of the step range, we always want to report the SIGTRAP, and let
3527 GDB handle it. Watchpoints should always be reported. So should
3528 signals we can't explain. A SIGTRAP we can't explain could be a
3529 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3530 do, we're be able to handle GDB breakpoints on top of internal
3531 breakpoints, by handling the internal breakpoint and still
3532 reporting the event to GDB. If we don't, we're out of luck, GDB
3533 won't see the breakpoint hit. If we see a single-step event but
3534 the thread should be continuing, don't pass the trap to gdb.
3535 That indicates that we had previously finished a single-step but
3536 left the single-step pending -- see
3537 complete_ongoing_step_over. */
3538 report_to_gdb
= (!maybe_internal_trap
3539 || (current_thread
->last_resume_kind
== resume_step
3541 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3543 && !bp_explains_trap
3545 && !step_over_finished
3546 && !(current_thread
->last_resume_kind
== resume_continue
3547 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3548 || (gdb_breakpoint_here (event_child
->stop_pc
)
3549 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3550 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3551 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3553 run_breakpoint_commands (event_child
->stop_pc
);
3555 /* We found no reason GDB would want us to stop. We either hit one
3556 of our own breakpoints, or finished an internal step GDB
3557 shouldn't know about. */
3562 if (bp_explains_trap
)
3563 debug_printf ("Hit a gdbserver breakpoint.\n");
3564 if (step_over_finished
)
3565 debug_printf ("Step-over finished.\n");
3567 debug_printf ("Tracepoint event.\n");
3568 if (lwp_in_step_range (event_child
))
3569 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3570 paddress (event_child
->stop_pc
),
3571 paddress (event_child
->step_range_start
),
3572 paddress (event_child
->step_range_end
));
3575 /* We're not reporting this breakpoint to GDB, so apply the
3576 decr_pc_after_break adjustment to the inferior's regcache
3579 if (the_low_target
.set_pc
!= NULL
)
3581 struct regcache
*regcache
3582 = get_thread_regcache (current_thread
, 1);
3583 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3586 if (step_over_finished
)
3588 /* If we have finished stepping over a breakpoint, we've
3589 stopped and suspended all LWPs momentarily except the
3590 stepping one. This is where we resume them all again.
3591 We're going to keep waiting, so use proceed, which
3592 handles stepping over the next breakpoint. */
3593 unsuspend_all_lwps (event_child
);
3597 /* Remove the single-step breakpoints if any. Note that
3598 there isn't single-step breakpoint if we finished stepping
3600 if (can_software_single_step ()
3601 && has_single_step_breakpoints (current_thread
))
3603 stop_all_lwps (0, event_child
);
3604 delete_single_step_breakpoints (current_thread
);
3605 unstop_all_lwps (0, event_child
);
3610 debug_printf ("proceeding all threads.\n");
3611 proceed_all_lwps ();
3616 return ignore_event (ourstatus
);
3621 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3624 = target_waitstatus_to_string (&event_child
->waitstatus
);
3626 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3627 lwpid_of (get_lwp_thread (event_child
)), str
.c_str ());
3629 if (current_thread
->last_resume_kind
== resume_step
)
3631 if (event_child
->step_range_start
== event_child
->step_range_end
)
3632 debug_printf ("GDB wanted to single-step, reporting event.\n");
3633 else if (!lwp_in_step_range (event_child
))
3634 debug_printf ("Out of step range, reporting event.\n");
3636 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3637 debug_printf ("Stopped by watchpoint.\n");
3638 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3639 debug_printf ("Stopped by GDB breakpoint.\n");
3641 debug_printf ("Hit a non-gdbserver trap event.\n");
3644 /* Alright, we're going to report a stop. */
3646 /* Remove single-step breakpoints. */
3647 if (can_software_single_step ())
3649 /* Remove single-step breakpoints or not. It it is true, stop all
3650 lwps, so that other threads won't hit the breakpoint in the
3652 int remove_single_step_breakpoints_p
= 0;
3656 remove_single_step_breakpoints_p
3657 = has_single_step_breakpoints (current_thread
);
3661 /* In all-stop, a stop reply cancels all previous resume
3662 requests. Delete all single-step breakpoints. */
3664 find_thread ([&] (thread_info
*thread
) {
3665 if (has_single_step_breakpoints (thread
))
3667 remove_single_step_breakpoints_p
= 1;
3675 if (remove_single_step_breakpoints_p
)
3677 /* If we remove single-step breakpoints from memory, stop all lwps,
3678 so that other threads won't hit the breakpoint in the staled
3680 stop_all_lwps (0, event_child
);
3684 gdb_assert (has_single_step_breakpoints (current_thread
));
3685 delete_single_step_breakpoints (current_thread
);
3689 for_each_thread ([] (thread_info
*thread
){
3690 if (has_single_step_breakpoints (thread
))
3691 delete_single_step_breakpoints (thread
);
3695 unstop_all_lwps (0, event_child
);
3699 if (!stabilizing_threads
)
3701 /* In all-stop, stop all threads. */
3703 stop_all_lwps (0, NULL
);
3705 if (step_over_finished
)
3709 /* If we were doing a step-over, all other threads but
3710 the stepping one had been paused in start_step_over,
3711 with their suspend counts incremented. We don't want
3712 to do a full unstop/unpause, because we're in
3713 all-stop mode (so we want threads stopped), but we
3714 still need to unsuspend the other threads, to
3715 decrement their `suspended' count back. */
3716 unsuspend_all_lwps (event_child
);
3720 /* If we just finished a step-over, then all threads had
3721 been momentarily paused. In all-stop, that's fine,
3722 we want threads stopped by now anyway. In non-stop,
3723 we need to re-resume threads that GDB wanted to be
3725 unstop_all_lwps (1, event_child
);
3729 /* If we're not waiting for a specific LWP, choose an event LWP
3730 from among those that have had events. Giving equal priority
3731 to all LWPs that have had events helps prevent
3733 if (ptid
== minus_one_ptid
)
3735 event_child
->status_pending_p
= 1;
3736 event_child
->status_pending
= w
;
3738 select_event_lwp (&event_child
);
3740 /* current_thread and event_child must stay in sync. */
3741 current_thread
= get_lwp_thread (event_child
);
3743 event_child
->status_pending_p
= 0;
3744 w
= event_child
->status_pending
;
3748 /* Stabilize threads (move out of jump pads). */
3750 stabilize_threads ();
3754 /* If we just finished a step-over, then all threads had been
3755 momentarily paused. In all-stop, that's fine, we want
3756 threads stopped by now anyway. In non-stop, we need to
3757 re-resume threads that GDB wanted to be running. */
3758 if (step_over_finished
)
3759 unstop_all_lwps (1, event_child
);
3762 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3764 /* If the reported event is an exit, fork, vfork or exec, let
3767 /* Break the unreported fork relationship chain. */
3768 if (event_child
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
3769 || event_child
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
)
3771 event_child
->fork_relative
->fork_relative
= NULL
;
3772 event_child
->fork_relative
= NULL
;
3775 *ourstatus
= event_child
->waitstatus
;
3776 /* Clear the event lwp's waitstatus since we handled it already. */
3777 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3780 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3782 /* Now that we've selected our final event LWP, un-adjust its PC if
3783 it was a software breakpoint, and the client doesn't know we can
3784 adjust the breakpoint ourselves. */
3785 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3786 && !cs
.swbreak_feature
)
3788 int decr_pc
= the_low_target
.decr_pc_after_break
;
3792 struct regcache
*regcache
3793 = get_thread_regcache (current_thread
, 1);
3794 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3798 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3800 get_syscall_trapinfo (event_child
,
3801 &ourstatus
->value
.syscall_number
);
3802 ourstatus
->kind
= event_child
->syscall_state
;
3804 else if (current_thread
->last_resume_kind
== resume_stop
3805 && WSTOPSIG (w
) == SIGSTOP
)
3807 /* A thread that has been requested to stop by GDB with vCont;t,
3808 and it stopped cleanly, so report as SIG0. The use of
3809 SIGSTOP is an implementation detail. */
3810 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3812 else if (current_thread
->last_resume_kind
== resume_stop
3813 && WSTOPSIG (w
) != SIGSTOP
)
3815 /* A thread that has been requested to stop by GDB with vCont;t,
3816 but, it stopped for other reasons. */
3817 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3819 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3821 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3824 gdb_assert (step_over_bkpt
== null_ptid
);
3828 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3829 target_pid_to_str (ptid_of (current_thread
)),
3830 ourstatus
->kind
, ourstatus
->value
.sig
);
3834 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3835 return filter_exit_event (event_child
, ourstatus
);
3837 return ptid_of (current_thread
);
3840 /* Get rid of any pending event in the pipe. */
3842 async_file_flush (void)
3848 ret
= read (linux_event_pipe
[0], &buf
, 1);
3849 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3852 /* Put something in the pipe, so the event loop wakes up. */
3854 async_file_mark (void)
3858 async_file_flush ();
3861 ret
= write (linux_event_pipe
[1], "+", 1);
3862 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3864 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3865 be awakened anyway. */
3869 linux_wait (ptid_t ptid
,
3870 struct target_waitstatus
*ourstatus
, int target_options
)
3874 /* Flush the async file first. */
3875 if (target_is_async_p ())
3876 async_file_flush ();
3880 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3882 while ((target_options
& TARGET_WNOHANG
) == 0
3883 && event_ptid
== null_ptid
3884 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3886 /* If at least one stop was reported, there may be more. A single
3887 SIGCHLD can signal more than one child stop. */
3888 if (target_is_async_p ()
3889 && (target_options
& TARGET_WNOHANG
) != 0
3890 && event_ptid
!= null_ptid
)
3896 /* Send a signal to an LWP. */
3899 kill_lwp (unsigned long lwpid
, int signo
)
3904 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3905 if (errno
== ENOSYS
)
3907 /* If tkill fails, then we are not using nptl threads, a
3908 configuration we no longer support. */
3909 perror_with_name (("tkill"));
3915 linux_stop_lwp (struct lwp_info
*lwp
)
3921 send_sigstop (struct lwp_info
*lwp
)
3925 pid
= lwpid_of (get_lwp_thread (lwp
));
3927 /* If we already have a pending stop signal for this process, don't
3929 if (lwp
->stop_expected
)
3932 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3938 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3940 lwp
->stop_expected
= 1;
3941 kill_lwp (pid
, SIGSTOP
);
3945 send_sigstop (thread_info
*thread
, lwp_info
*except
)
3947 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3949 /* Ignore EXCEPT. */
3959 /* Increment the suspend count of an LWP, and stop it, if not stopped
3962 suspend_and_send_sigstop (thread_info
*thread
, lwp_info
*except
)
3964 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3966 /* Ignore EXCEPT. */
3970 lwp_suspended_inc (lwp
);
3972 send_sigstop (thread
, except
);
3976 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3978 /* Store the exit status for later. */
3979 lwp
->status_pending_p
= 1;
3980 lwp
->status_pending
= wstat
;
3982 /* Store in waitstatus as well, as there's nothing else to process
3984 if (WIFEXITED (wstat
))
3986 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
3987 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
3989 else if (WIFSIGNALED (wstat
))
3991 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
3992 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
3995 /* Prevent trying to stop it. */
3998 /* No further stops are expected from a dead lwp. */
3999 lwp
->stop_expected
= 0;
4002 /* Return true if LWP has exited already, and has a pending exit event
4003 to report to GDB. */
4006 lwp_is_marked_dead (struct lwp_info
*lwp
)
4008 return (lwp
->status_pending_p
4009 && (WIFEXITED (lwp
->status_pending
)
4010 || WIFSIGNALED (lwp
->status_pending
)));
4013 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4016 wait_for_sigstop (void)
4018 struct thread_info
*saved_thread
;
4023 saved_thread
= current_thread
;
4024 if (saved_thread
!= NULL
)
4025 saved_tid
= saved_thread
->id
;
4027 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4030 debug_printf ("wait_for_sigstop: pulling events\n");
4032 /* Passing NULL_PTID as filter indicates we want all events to be
4033 left pending. Eventually this returns when there are no
4034 unwaited-for children left. */
4035 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4037 gdb_assert (ret
== -1);
4039 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4040 current_thread
= saved_thread
;
4044 debug_printf ("Previously current thread died.\n");
4046 /* We can't change the current inferior behind GDB's back,
4047 otherwise, a subsequent command may apply to the wrong
4049 current_thread
= NULL
;
4053 /* Returns true if THREAD is stopped in a jump pad, and we can't
4054 move it out, because we need to report the stop event to GDB. For
4055 example, if the user puts a breakpoint in the jump pad, it's
4056 because she wants to debug it. */
4059 stuck_in_jump_pad_callback (thread_info
*thread
)
4061 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4063 if (lwp
->suspended
!= 0)
4065 internal_error (__FILE__
, __LINE__
,
4066 "LWP %ld is suspended, suspended=%d\n",
4067 lwpid_of (thread
), lwp
->suspended
);
4069 gdb_assert (lwp
->stopped
);
4071 /* Allow debugging the jump pad, gdb_collect, etc.. */
4072 return (supports_fast_tracepoints ()
4073 && agent_loaded_p ()
4074 && (gdb_breakpoint_here (lwp
->stop_pc
)
4075 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4076 || thread
->last_resume_kind
== resume_step
)
4077 && (linux_fast_tracepoint_collecting (lwp
, NULL
)
4078 != fast_tpoint_collect_result::not_collecting
));
4082 move_out_of_jump_pad_callback (thread_info
*thread
)
4084 struct thread_info
*saved_thread
;
4085 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4088 if (lwp
->suspended
!= 0)
4090 internal_error (__FILE__
, __LINE__
,
4091 "LWP %ld is suspended, suspended=%d\n",
4092 lwpid_of (thread
), lwp
->suspended
);
4094 gdb_assert (lwp
->stopped
);
4096 /* For gdb_breakpoint_here. */
4097 saved_thread
= current_thread
;
4098 current_thread
= thread
;
4100 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4102 /* Allow debugging the jump pad, gdb_collect, etc. */
4103 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4104 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4105 && thread
->last_resume_kind
!= resume_step
4106 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4109 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4114 lwp
->status_pending_p
= 0;
4115 enqueue_one_deferred_signal (lwp
, wstat
);
4118 debug_printf ("Signal %d for LWP %ld deferred "
4120 WSTOPSIG (*wstat
), lwpid_of (thread
));
4123 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4126 lwp_suspended_inc (lwp
);
4128 current_thread
= saved_thread
;
4132 lwp_running (thread_info
*thread
)
4134 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4136 if (lwp_is_marked_dead (lwp
))
4139 return !lwp
->stopped
;
4142 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4143 If SUSPEND, then also increase the suspend count of every LWP,
4147 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4149 /* Should not be called recursively. */
4150 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4155 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4156 suspend
? "stop-and-suspend" : "stop",
4158 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4162 stopping_threads
= (suspend
4163 ? STOPPING_AND_SUSPENDING_THREADS
4164 : STOPPING_THREADS
);
4167 for_each_thread ([&] (thread_info
*thread
)
4169 suspend_and_send_sigstop (thread
, except
);
4172 for_each_thread ([&] (thread_info
*thread
)
4174 send_sigstop (thread
, except
);
4177 wait_for_sigstop ();
4178 stopping_threads
= NOT_STOPPING_THREADS
;
4182 debug_printf ("stop_all_lwps done, setting stopping_threads "
4183 "back to !stopping\n");
4188 /* Enqueue one signal in the chain of signals which need to be
4189 delivered to this process on next resume. */
4192 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4194 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4196 p_sig
->prev
= lwp
->pending_signals
;
4197 p_sig
->signal
= signal
;
4199 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4201 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4202 lwp
->pending_signals
= p_sig
;
4205 /* Install breakpoints for software single stepping. */
4208 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4210 struct thread_info
*thread
= get_lwp_thread (lwp
);
4211 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4213 scoped_restore save_current_thread
= make_scoped_restore (¤t_thread
);
4215 current_thread
= thread
;
4216 std::vector
<CORE_ADDR
> next_pcs
= the_low_target
.get_next_pcs (regcache
);
4218 for (CORE_ADDR pc
: next_pcs
)
4219 set_single_step_breakpoint (pc
, current_ptid
);
4222 /* Single step via hardware or software single step.
4223 Return 1 if hardware single stepping, 0 if software single stepping
4224 or can't single step. */
4227 single_step (struct lwp_info
* lwp
)
4231 if (can_hardware_single_step ())
4235 else if (can_software_single_step ())
4237 install_software_single_step_breakpoints (lwp
);
4243 debug_printf ("stepping is not implemented on this target");
4249 /* The signal can be delivered to the inferior if we are not trying to
4250 finish a fast tracepoint collect. Since signal can be delivered in
4251 the step-over, the program may go to signal handler and trap again
4252 after return from the signal handler. We can live with the spurious
4256 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4258 return (lwp
->collecting_fast_tracepoint
4259 == fast_tpoint_collect_result::not_collecting
);
4262 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4263 SIGNAL is nonzero, give it that signal. */
4266 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4267 int step
, int signal
, siginfo_t
*info
)
4269 struct thread_info
*thread
= get_lwp_thread (lwp
);
4270 struct thread_info
*saved_thread
;
4272 struct process_info
*proc
= get_thread_process (thread
);
4274 /* Note that target description may not be initialised
4275 (proc->tdesc == NULL) at this point because the program hasn't
4276 stopped at the first instruction yet. It means GDBserver skips
4277 the extra traps from the wrapper program (see option --wrapper).
4278 Code in this function that requires register access should be
4279 guarded by proc->tdesc == NULL or something else. */
4281 if (lwp
->stopped
== 0)
4284 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4286 fast_tpoint_collect_result fast_tp_collecting
4287 = lwp
->collecting_fast_tracepoint
;
4289 gdb_assert (!stabilizing_threads
4290 || (fast_tp_collecting
4291 != fast_tpoint_collect_result::not_collecting
));
4293 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4294 user used the "jump" command, or "set $pc = foo"). */
4295 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4297 /* Collecting 'while-stepping' actions doesn't make sense
4299 release_while_stepping_state_list (thread
);
4302 /* If we have pending signals or status, and a new signal, enqueue the
4303 signal. Also enqueue the signal if it can't be delivered to the
4304 inferior right now. */
4306 && (lwp
->status_pending_p
4307 || lwp
->pending_signals
!= NULL
4308 || !lwp_signal_can_be_delivered (lwp
)))
4310 enqueue_pending_signal (lwp
, signal
, info
);
4312 /* Postpone any pending signal. It was enqueued above. */
4316 if (lwp
->status_pending_p
)
4319 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4320 " has pending status\n",
4321 lwpid_of (thread
), step
? "step" : "continue",
4322 lwp
->stop_expected
? "expected" : "not expected");
4326 saved_thread
= current_thread
;
4327 current_thread
= thread
;
4329 /* This bit needs some thinking about. If we get a signal that
4330 we must report while a single-step reinsert is still pending,
4331 we often end up resuming the thread. It might be better to
4332 (ew) allow a stack of pending events; then we could be sure that
4333 the reinsert happened right away and not lose any signals.
4335 Making this stack would also shrink the window in which breakpoints are
4336 uninserted (see comment in linux_wait_for_lwp) but not enough for
4337 complete correctness, so it won't solve that problem. It may be
4338 worthwhile just to solve this one, however. */
4339 if (lwp
->bp_reinsert
!= 0)
4342 debug_printf (" pending reinsert at 0x%s\n",
4343 paddress (lwp
->bp_reinsert
));
4345 if (can_hardware_single_step ())
4347 if (fast_tp_collecting
== fast_tpoint_collect_result::not_collecting
)
4350 warning ("BAD - reinserting but not stepping.");
4352 warning ("BAD - reinserting and suspended(%d).",
4357 step
= maybe_hw_step (thread
);
4360 if (fast_tp_collecting
== fast_tpoint_collect_result::before_insn
)
4363 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4364 " (exit-jump-pad-bkpt)\n",
4367 else if (fast_tp_collecting
== fast_tpoint_collect_result::at_insn
)
4370 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4371 " single-stepping\n",
4374 if (can_hardware_single_step ())
4378 internal_error (__FILE__
, __LINE__
,
4379 "moving out of jump pad single-stepping"
4380 " not implemented on this target");
4384 /* If we have while-stepping actions in this thread set it stepping.
4385 If we have a signal to deliver, it may or may not be set to
4386 SIG_IGN, we don't know. Assume so, and allow collecting
4387 while-stepping into a signal handler. A possible smart thing to
4388 do would be to set an internal breakpoint at the signal return
4389 address, continue, and carry on catching this while-stepping
4390 action only when that breakpoint is hit. A future
4392 if (thread
->while_stepping
!= NULL
)
4395 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4398 step
= single_step (lwp
);
4401 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4403 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4405 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4409 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4410 (long) lwp
->stop_pc
);
4414 /* If we have pending signals, consume one if it can be delivered to
4416 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4418 struct pending_signals
**p_sig
;
4420 p_sig
= &lwp
->pending_signals
;
4421 while ((*p_sig
)->prev
!= NULL
)
4422 p_sig
= &(*p_sig
)->prev
;
4424 signal
= (*p_sig
)->signal
;
4425 if ((*p_sig
)->info
.si_signo
!= 0)
4426 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4434 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4435 lwpid_of (thread
), step
? "step" : "continue", signal
,
4436 lwp
->stop_expected
? "expected" : "not expected");
4438 if (the_low_target
.prepare_to_resume
!= NULL
)
4439 the_low_target
.prepare_to_resume (lwp
);
4441 regcache_invalidate_thread (thread
);
4443 lwp
->stepping
= step
;
4445 ptrace_request
= PTRACE_SINGLESTEP
;
4446 else if (gdb_catching_syscalls_p (lwp
))
4447 ptrace_request
= PTRACE_SYSCALL
;
4449 ptrace_request
= PTRACE_CONT
;
4450 ptrace (ptrace_request
,
4452 (PTRACE_TYPE_ARG3
) 0,
4453 /* Coerce to a uintptr_t first to avoid potential gcc warning
4454 of coercing an 8 byte integer to a 4 byte pointer. */
4455 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4457 current_thread
= saved_thread
;
4459 perror_with_name ("resuming thread");
4461 /* Successfully resumed. Clear state that no longer makes sense,
4462 and mark the LWP as running. Must not do this before resuming
4463 otherwise if that fails other code will be confused. E.g., we'd
4464 later try to stop the LWP and hang forever waiting for a stop
4465 status. Note that we must not throw after this is cleared,
4466 otherwise handle_zombie_lwp_error would get confused. */
4468 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4471 /* Called when we try to resume a stopped LWP and that errors out. If
4472 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4473 or about to become), discard the error, clear any pending status
4474 the LWP may have, and return true (we'll collect the exit status
4475 soon enough). Otherwise, return false. */
4478 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4480 struct thread_info
*thread
= get_lwp_thread (lp
);
4482 /* If we get an error after resuming the LWP successfully, we'd
4483 confuse !T state for the LWP being gone. */
4484 gdb_assert (lp
->stopped
);
4486 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4487 because even if ptrace failed with ESRCH, the tracee may be "not
4488 yet fully dead", but already refusing ptrace requests. In that
4489 case the tracee has 'R (Running)' state for a little bit
4490 (observed in Linux 3.18). See also the note on ESRCH in the
4491 ptrace(2) man page. Instead, check whether the LWP has any state
4492 other than ptrace-stopped. */
4494 /* Don't assume anything if /proc/PID/status can't be read. */
4495 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4497 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4498 lp
->status_pending_p
= 0;
4504 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4505 disappears while we try to resume it. */
4508 linux_resume_one_lwp (struct lwp_info
*lwp
,
4509 int step
, int signal
, siginfo_t
*info
)
4513 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4515 CATCH (ex
, RETURN_MASK_ERROR
)
4517 if (!check_ptrace_stopped_lwp_gone (lwp
))
4518 throw_exception (ex
);
4523 /* This function is called once per thread via for_each_thread.
4524 We look up which resume request applies to THREAD and mark it with a
4525 pointer to the appropriate resume request.
4527 This algorithm is O(threads * resume elements), but resume elements
4528 is small (and will remain small at least until GDB supports thread
4532 linux_set_resume_request (thread_info
*thread
, thread_resume
*resume
, size_t n
)
4534 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4536 for (int ndx
= 0; ndx
< n
; ndx
++)
4538 ptid_t ptid
= resume
[ndx
].thread
;
4539 if (ptid
== minus_one_ptid
4540 || ptid
== thread
->id
4541 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4543 || (ptid
.pid () == pid_of (thread
)
4545 || ptid
.lwp () == -1)))
4547 if (resume
[ndx
].kind
== resume_stop
4548 && thread
->last_resume_kind
== resume_stop
)
4551 debug_printf ("already %s LWP %ld at GDB's request\n",
4552 (thread
->last_status
.kind
4553 == TARGET_WAITKIND_STOPPED
)
4561 /* Ignore (wildcard) resume requests for already-resumed
4563 if (resume
[ndx
].kind
!= resume_stop
4564 && thread
->last_resume_kind
!= resume_stop
)
4567 debug_printf ("already %s LWP %ld at GDB's request\n",
4568 (thread
->last_resume_kind
4576 /* Don't let wildcard resumes resume fork children that GDB
4577 does not yet know are new fork children. */
4578 if (lwp
->fork_relative
!= NULL
)
4580 struct lwp_info
*rel
= lwp
->fork_relative
;
4582 if (rel
->status_pending_p
4583 && (rel
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
4584 || rel
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
))
4587 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4593 /* If the thread has a pending event that has already been
4594 reported to GDBserver core, but GDB has not pulled the
4595 event out of the vStopped queue yet, likewise, ignore the
4596 (wildcard) resume request. */
4597 if (in_queued_stop_replies (thread
->id
))
4600 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4605 lwp
->resume
= &resume
[ndx
];
4606 thread
->last_resume_kind
= lwp
->resume
->kind
;
4608 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4609 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4611 /* If we had a deferred signal to report, dequeue one now.
4612 This can happen if LWP gets more than one signal while
4613 trying to get out of a jump pad. */
4615 && !lwp
->status_pending_p
4616 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4618 lwp
->status_pending_p
= 1;
4621 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4622 "leaving status pending.\n",
4623 WSTOPSIG (lwp
->status_pending
),
4631 /* No resume action for this thread. */
4635 /* find_thread callback for linux_resume. Return true if this lwp has an
4636 interesting status pending. */
4639 resume_status_pending_p (thread_info
*thread
)
4641 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4643 /* LWPs which will not be resumed are not interesting, because
4644 we might not wait for them next time through linux_wait. */
4645 if (lwp
->resume
== NULL
)
4648 return thread_still_has_status_pending_p (thread
);
4651 /* Return 1 if this lwp that GDB wants running is stopped at an
4652 internal breakpoint that we need to step over. It assumes that any
4653 required STOP_PC adjustment has already been propagated to the
4654 inferior's regcache. */
4657 need_step_over_p (thread_info
*thread
)
4659 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4660 struct thread_info
*saved_thread
;
4662 struct process_info
*proc
= get_thread_process (thread
);
4664 /* GDBserver is skipping the extra traps from the wrapper program,
4665 don't have to do step over. */
4666 if (proc
->tdesc
== NULL
)
4669 /* LWPs which will not be resumed are not interesting, because we
4670 might not wait for them next time through linux_wait. */
4675 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4680 if (thread
->last_resume_kind
== resume_stop
)
4683 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4689 gdb_assert (lwp
->suspended
>= 0);
4694 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4699 if (lwp
->status_pending_p
)
4702 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4708 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4712 /* If the PC has changed since we stopped, then don't do anything,
4713 and let the breakpoint/tracepoint be hit. This happens if, for
4714 instance, GDB handled the decr_pc_after_break subtraction itself,
4715 GDB is OOL stepping this thread, or the user has issued a "jump"
4716 command, or poked thread's registers herself. */
4717 if (pc
!= lwp
->stop_pc
)
4720 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4721 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4723 paddress (lwp
->stop_pc
), paddress (pc
));
4727 /* On software single step target, resume the inferior with signal
4728 rather than stepping over. */
4729 if (can_software_single_step ()
4730 && lwp
->pending_signals
!= NULL
4731 && lwp_signal_can_be_delivered (lwp
))
4734 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4741 saved_thread
= current_thread
;
4742 current_thread
= thread
;
4744 /* We can only step over breakpoints we know about. */
4745 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4747 /* Don't step over a breakpoint that GDB expects to hit
4748 though. If the condition is being evaluated on the target's side
4749 and it evaluate to false, step over this breakpoint as well. */
4750 if (gdb_breakpoint_here (pc
)
4751 && gdb_condition_true_at_breakpoint (pc
)
4752 && gdb_no_commands_at_breakpoint (pc
))
4755 debug_printf ("Need step over [LWP %ld]? yes, but found"
4756 " GDB breakpoint at 0x%s; skipping step over\n",
4757 lwpid_of (thread
), paddress (pc
));
4759 current_thread
= saved_thread
;
4765 debug_printf ("Need step over [LWP %ld]? yes, "
4766 "found breakpoint at 0x%s\n",
4767 lwpid_of (thread
), paddress (pc
));
4769 /* We've found an lwp that needs stepping over --- return 1 so
4770 that find_thread stops looking. */
4771 current_thread
= saved_thread
;
4777 current_thread
= saved_thread
;
4780 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4782 lwpid_of (thread
), paddress (pc
));
4787 /* Start a step-over operation on LWP. When LWP stopped at a
4788 breakpoint, to make progress, we need to remove the breakpoint out
4789 of the way. If we let other threads run while we do that, they may
4790 pass by the breakpoint location and miss hitting it. To avoid
4791 that, a step-over momentarily stops all threads while LWP is
4792 single-stepped by either hardware or software while the breakpoint
4793 is temporarily uninserted from the inferior. When the single-step
4794 finishes, we reinsert the breakpoint, and let all threads that are
4795 supposed to be running, run again. */
4798 start_step_over (struct lwp_info
*lwp
)
4800 struct thread_info
*thread
= get_lwp_thread (lwp
);
4801 struct thread_info
*saved_thread
;
4806 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4809 stop_all_lwps (1, lwp
);
4811 if (lwp
->suspended
!= 0)
4813 internal_error (__FILE__
, __LINE__
,
4814 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4819 debug_printf ("Done stopping all threads for step-over.\n");
4821 /* Note, we should always reach here with an already adjusted PC,
4822 either by GDB (if we're resuming due to GDB's request), or by our
4823 caller, if we just finished handling an internal breakpoint GDB
4824 shouldn't care about. */
4827 saved_thread
= current_thread
;
4828 current_thread
= thread
;
4830 lwp
->bp_reinsert
= pc
;
4831 uninsert_breakpoints_at (pc
);
4832 uninsert_fast_tracepoint_jumps_at (pc
);
4834 step
= single_step (lwp
);
4836 current_thread
= saved_thread
;
4838 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4840 /* Require next event from this LWP. */
4841 step_over_bkpt
= thread
->id
;
4845 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4846 start_step_over, if still there, and delete any single-step
4847 breakpoints we've set, on non hardware single-step targets. */
4850 finish_step_over (struct lwp_info
*lwp
)
4852 if (lwp
->bp_reinsert
!= 0)
4854 struct thread_info
*saved_thread
= current_thread
;
4857 debug_printf ("Finished step over.\n");
4859 current_thread
= get_lwp_thread (lwp
);
4861 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4862 may be no breakpoint to reinsert there by now. */
4863 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4864 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4866 lwp
->bp_reinsert
= 0;
4868 /* Delete any single-step breakpoints. No longer needed. We
4869 don't have to worry about other threads hitting this trap,
4870 and later not being able to explain it, because we were
4871 stepping over a breakpoint, and we hold all threads but
4872 LWP stopped while doing that. */
4873 if (!can_hardware_single_step ())
4875 gdb_assert (has_single_step_breakpoints (current_thread
));
4876 delete_single_step_breakpoints (current_thread
);
4879 step_over_bkpt
= null_ptid
;
4880 current_thread
= saved_thread
;
4887 /* If there's a step over in progress, wait until all threads stop
4888 (that is, until the stepping thread finishes its step), and
4889 unsuspend all lwps. The stepping thread ends with its status
4890 pending, which is processed later when we get back to processing
4894 complete_ongoing_step_over (void)
4896 if (step_over_bkpt
!= null_ptid
)
4898 struct lwp_info
*lwp
;
4903 debug_printf ("detach: step over in progress, finish it first\n");
4905 /* Passing NULL_PTID as filter indicates we want all events to
4906 be left pending. Eventually this returns when there are no
4907 unwaited-for children left. */
4908 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4910 gdb_assert (ret
== -1);
4912 lwp
= find_lwp_pid (step_over_bkpt
);
4914 finish_step_over (lwp
);
4915 step_over_bkpt
= null_ptid
;
4916 unsuspend_all_lwps (lwp
);
4920 /* This function is called once per thread. We check the thread's resume
4921 request, which will tell us whether to resume, step, or leave the thread
4922 stopped; and what signal, if any, it should be sent.
4924 For threads which we aren't explicitly told otherwise, we preserve
4925 the stepping flag; this is used for stepping over gdbserver-placed
4928 If pending_flags was set in any thread, we queue any needed
4929 signals, since we won't actually resume. We already have a pending
4930 event to report, so we don't need to preserve any step requests;
4931 they should be re-issued if necessary. */
4934 linux_resume_one_thread (thread_info
*thread
, bool leave_all_stopped
)
4936 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4939 if (lwp
->resume
== NULL
)
4942 if (lwp
->resume
->kind
== resume_stop
)
4945 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4950 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
4952 /* Stop the thread, and wait for the event asynchronously,
4953 through the event loop. */
4959 debug_printf ("already stopped LWP %ld\n",
4962 /* The LWP may have been stopped in an internal event that
4963 was not meant to be notified back to GDB (e.g., gdbserver
4964 breakpoint), so we should be reporting a stop event in
4967 /* If the thread already has a pending SIGSTOP, this is a
4968 no-op. Otherwise, something later will presumably resume
4969 the thread and this will cause it to cancel any pending
4970 operation, due to last_resume_kind == resume_stop. If
4971 the thread already has a pending status to report, we
4972 will still report it the next time we wait - see
4973 status_pending_p_callback. */
4975 /* If we already have a pending signal to report, then
4976 there's no need to queue a SIGSTOP, as this means we're
4977 midway through moving the LWP out of the jumppad, and we
4978 will report the pending signal as soon as that is
4980 if (lwp
->pending_signals_to_report
== NULL
)
4984 /* For stop requests, we're done. */
4986 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4990 /* If this thread which is about to be resumed has a pending status,
4991 then don't resume it - we can just report the pending status.
4992 Likewise if it is suspended, because e.g., another thread is
4993 stepping past a breakpoint. Make sure to queue any signals that
4994 would otherwise be sent. In all-stop mode, we do this decision
4995 based on if *any* thread has a pending status. If there's a
4996 thread that needs the step-over-breakpoint dance, then don't
4997 resume any other thread but that particular one. */
4998 leave_pending
= (lwp
->suspended
4999 || lwp
->status_pending_p
5000 || leave_all_stopped
);
5002 /* If we have a new signal, enqueue the signal. */
5003 if (lwp
->resume
->sig
!= 0)
5005 siginfo_t info
, *info_p
;
5007 /* If this is the same signal we were previously stopped by,
5008 make sure to queue its siginfo. */
5009 if (WIFSTOPPED (lwp
->last_status
)
5010 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
5011 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
5012 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
5017 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
5023 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
5025 proceed_one_lwp (thread
, NULL
);
5030 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5033 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5038 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5040 struct thread_info
*need_step_over
= NULL
;
5045 debug_printf ("linux_resume:\n");
5048 for_each_thread ([&] (thread_info
*thread
)
5050 linux_set_resume_request (thread
, resume_info
, n
);
5053 /* If there is a thread which would otherwise be resumed, which has
5054 a pending status, then don't resume any threads - we can just
5055 report the pending status. Make sure to queue any signals that
5056 would otherwise be sent. In non-stop mode, we'll apply this
5057 logic to each thread individually. We consume all pending events
5058 before considering to start a step-over (in all-stop). */
5059 bool any_pending
= false;
5061 any_pending
= find_thread (resume_status_pending_p
) != NULL
;
5063 /* If there is a thread which would otherwise be resumed, which is
5064 stopped at a breakpoint that needs stepping over, then don't
5065 resume any threads - have it step over the breakpoint with all
5066 other threads stopped, then resume all threads again. Make sure
5067 to queue any signals that would otherwise be delivered or
5069 if (!any_pending
&& supports_breakpoints ())
5070 need_step_over
= find_thread (need_step_over_p
);
5072 bool leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5076 if (need_step_over
!= NULL
)
5077 debug_printf ("Not resuming all, need step over\n");
5078 else if (any_pending
)
5079 debug_printf ("Not resuming, all-stop and found "
5080 "an LWP with pending status\n");
5082 debug_printf ("Resuming, no pending status or step over needed\n");
5085 /* Even if we're leaving threads stopped, queue all signals we'd
5086 otherwise deliver. */
5087 for_each_thread ([&] (thread_info
*thread
)
5089 linux_resume_one_thread (thread
, leave_all_stopped
);
5093 start_step_over (get_thread_lwp (need_step_over
));
5097 debug_printf ("linux_resume done\n");
5101 /* We may have events that were pending that can/should be sent to
5102 the client now. Trigger a linux_wait call. */
5103 if (target_is_async_p ())
5107 /* This function is called once per thread. We check the thread's
5108 last resume request, which will tell us whether to resume, step, or
5109 leave the thread stopped. Any signal the client requested to be
5110 delivered has already been enqueued at this point.
5112 If any thread that GDB wants running is stopped at an internal
5113 breakpoint that needs stepping over, we start a step-over operation
5114 on that particular thread, and leave all others stopped. */
5117 proceed_one_lwp (thread_info
*thread
, lwp_info
*except
)
5119 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5126 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5131 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5135 if (thread
->last_resume_kind
== resume_stop
5136 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5139 debug_printf (" client wants LWP to remain %ld stopped\n",
5144 if (lwp
->status_pending_p
)
5147 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5152 gdb_assert (lwp
->suspended
>= 0);
5157 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5161 if (thread
->last_resume_kind
== resume_stop
5162 && lwp
->pending_signals_to_report
== NULL
5163 && (lwp
->collecting_fast_tracepoint
5164 == fast_tpoint_collect_result::not_collecting
))
5166 /* We haven't reported this LWP as stopped yet (otherwise, the
5167 last_status.kind check above would catch it, and we wouldn't
5168 reach here. This LWP may have been momentarily paused by a
5169 stop_all_lwps call while handling for example, another LWP's
5170 step-over. In that case, the pending expected SIGSTOP signal
5171 that was queued at vCont;t handling time will have already
5172 been consumed by wait_for_sigstop, and so we need to requeue
5173 another one here. Note that if the LWP already has a SIGSTOP
5174 pending, this is a no-op. */
5177 debug_printf ("Client wants LWP %ld to stop. "
5178 "Making sure it has a SIGSTOP pending\n",
5184 if (thread
->last_resume_kind
== resume_step
)
5187 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5190 /* If resume_step is requested by GDB, install single-step
5191 breakpoints when the thread is about to be actually resumed if
5192 the single-step breakpoints weren't removed. */
5193 if (can_software_single_step ()
5194 && !has_single_step_breakpoints (thread
))
5195 install_software_single_step_breakpoints (lwp
);
5197 step
= maybe_hw_step (thread
);
5199 else if (lwp
->bp_reinsert
!= 0)
5202 debug_printf (" stepping LWP %ld, reinsert set\n",
5205 step
= maybe_hw_step (thread
);
5210 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5214 unsuspend_and_proceed_one_lwp (thread_info
*thread
, lwp_info
*except
)
5216 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5221 lwp_suspended_decr (lwp
);
5223 proceed_one_lwp (thread
, except
);
5226 /* When we finish a step-over, set threads running again. If there's
5227 another thread that may need a step-over, now's the time to start
5228 it. Eventually, we'll move all threads past their breakpoints. */
5231 proceed_all_lwps (void)
5233 struct thread_info
*need_step_over
;
5235 /* If there is a thread which would otherwise be resumed, which is
5236 stopped at a breakpoint that needs stepping over, then don't
5237 resume any threads - have it step over the breakpoint with all
5238 other threads stopped, then resume all threads again. */
5240 if (supports_breakpoints ())
5242 need_step_over
= find_thread (need_step_over_p
);
5244 if (need_step_over
!= NULL
)
5247 debug_printf ("proceed_all_lwps: found "
5248 "thread %ld needing a step-over\n",
5249 lwpid_of (need_step_over
));
5251 start_step_over (get_thread_lwp (need_step_over
));
5257 debug_printf ("Proceeding, no step-over needed\n");
5259 for_each_thread ([] (thread_info
*thread
)
5261 proceed_one_lwp (thread
, NULL
);
5265 /* Stopped LWPs that the client wanted to be running, that don't have
5266 pending statuses, are set to run again, except for EXCEPT, if not
5267 NULL. This undoes a stop_all_lwps call. */
5270 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5276 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5277 lwpid_of (get_lwp_thread (except
)));
5279 debug_printf ("unstopping all lwps\n");
5283 for_each_thread ([&] (thread_info
*thread
)
5285 unsuspend_and_proceed_one_lwp (thread
, except
);
5288 for_each_thread ([&] (thread_info
*thread
)
5290 proceed_one_lwp (thread
, except
);
5295 debug_printf ("unstop_all_lwps done\n");
5301 #ifdef HAVE_LINUX_REGSETS
5303 #define use_linux_regsets 1
5305 /* Returns true if REGSET has been disabled. */
5308 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5310 return (info
->disabled_regsets
!= NULL
5311 && info
->disabled_regsets
[regset
- info
->regsets
]);
5314 /* Disable REGSET. */
5317 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5321 dr_offset
= regset
- info
->regsets
;
5322 if (info
->disabled_regsets
== NULL
)
5323 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5324 info
->disabled_regsets
[dr_offset
] = 1;
5328 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5329 struct regcache
*regcache
)
5331 struct regset_info
*regset
;
5332 int saw_general_regs
= 0;
5336 pid
= lwpid_of (current_thread
);
5337 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5342 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5345 buf
= xmalloc (regset
->size
);
5347 nt_type
= regset
->nt_type
;
5351 iov
.iov_len
= regset
->size
;
5352 data
= (void *) &iov
;
5358 res
= ptrace (regset
->get_request
, pid
,
5359 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5361 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5366 || (errno
== EINVAL
&& regset
->type
== OPTIONAL_REGS
))
5368 /* If we get EIO on a regset, or an EINVAL and the regset is
5369 optional, do not try it again for this process mode. */
5370 disable_regset (regsets_info
, regset
);
5372 else if (errno
== ENODATA
)
5374 /* ENODATA may be returned if the regset is currently
5375 not "active". This can happen in normal operation,
5376 so suppress the warning in this case. */
5378 else if (errno
== ESRCH
)
5380 /* At this point, ESRCH should mean the process is
5381 already gone, in which case we simply ignore attempts
5382 to read its registers. */
5387 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5394 if (regset
->type
== GENERAL_REGS
)
5395 saw_general_regs
= 1;
5396 regset
->store_function (regcache
, buf
);
5400 if (saw_general_regs
)
5407 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5408 struct regcache
*regcache
)
5410 struct regset_info
*regset
;
5411 int saw_general_regs
= 0;
5415 pid
= lwpid_of (current_thread
);
5416 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5421 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5422 || regset
->fill_function
== NULL
)
5425 buf
= xmalloc (regset
->size
);
5427 /* First fill the buffer with the current register set contents,
5428 in case there are any items in the kernel's regset that are
5429 not in gdbserver's regcache. */
5431 nt_type
= regset
->nt_type
;
5435 iov
.iov_len
= regset
->size
;
5436 data
= (void *) &iov
;
5442 res
= ptrace (regset
->get_request
, pid
,
5443 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5445 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5450 /* Then overlay our cached registers on that. */
5451 regset
->fill_function (regcache
, buf
);
5453 /* Only now do we write the register set. */
5455 res
= ptrace (regset
->set_request
, pid
,
5456 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5458 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5465 || (errno
== EINVAL
&& regset
->type
== OPTIONAL_REGS
))
5467 /* If we get EIO on a regset, or an EINVAL and the regset is
5468 optional, do not try it again for this process mode. */
5469 disable_regset (regsets_info
, regset
);
5471 else if (errno
== ESRCH
)
5473 /* At this point, ESRCH should mean the process is
5474 already gone, in which case we simply ignore attempts
5475 to change its registers. See also the related
5476 comment in linux_resume_one_lwp. */
5482 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5485 else if (regset
->type
== GENERAL_REGS
)
5486 saw_general_regs
= 1;
5489 if (saw_general_regs
)
5495 #else /* !HAVE_LINUX_REGSETS */
5497 #define use_linux_regsets 0
5498 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5499 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5503 /* Return 1 if register REGNO is supported by one of the regset ptrace
5504 calls or 0 if it has to be transferred individually. */
5507 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5509 unsigned char mask
= 1 << (regno
% 8);
5510 size_t index
= regno
/ 8;
5512 return (use_linux_regsets
5513 && (regs_info
->regset_bitmap
== NULL
5514 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5517 #ifdef HAVE_LINUX_USRREGS
5520 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5524 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5525 error ("Invalid register number %d.", regnum
);
5527 addr
= usrregs
->regmap
[regnum
];
5532 /* Fetch one register. */
5534 fetch_register (const struct usrregs_info
*usrregs
,
5535 struct regcache
*regcache
, int regno
)
5542 if (regno
>= usrregs
->num_regs
)
5544 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5547 regaddr
= register_addr (usrregs
, regno
);
5551 size
= ((register_size (regcache
->tdesc
, regno
)
5552 + sizeof (PTRACE_XFER_TYPE
) - 1)
5553 & -sizeof (PTRACE_XFER_TYPE
));
5554 buf
= (char *) alloca (size
);
5556 pid
= lwpid_of (current_thread
);
5557 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5560 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5561 ptrace (PTRACE_PEEKUSER
, pid
,
5562 /* Coerce to a uintptr_t first to avoid potential gcc warning
5563 of coercing an 8 byte integer to a 4 byte pointer. */
5564 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5565 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5568 /* Mark register REGNO unavailable. */
5569 supply_register (regcache
, regno
, NULL
);
5574 if (the_low_target
.supply_ptrace_register
)
5575 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5577 supply_register (regcache
, regno
, buf
);
5580 /* Store one register. */
5582 store_register (const struct usrregs_info
*usrregs
,
5583 struct regcache
*regcache
, int regno
)
5590 if (regno
>= usrregs
->num_regs
)
5592 if ((*the_low_target
.cannot_store_register
) (regno
))
5595 regaddr
= register_addr (usrregs
, regno
);
5599 size
= ((register_size (regcache
->tdesc
, regno
)
5600 + sizeof (PTRACE_XFER_TYPE
) - 1)
5601 & -sizeof (PTRACE_XFER_TYPE
));
5602 buf
= (char *) alloca (size
);
5603 memset (buf
, 0, size
);
5605 if (the_low_target
.collect_ptrace_register
)
5606 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5608 collect_register (regcache
, regno
, buf
);
5610 pid
= lwpid_of (current_thread
);
5611 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5614 ptrace (PTRACE_POKEUSER
, pid
,
5615 /* Coerce to a uintptr_t first to avoid potential gcc warning
5616 about coercing an 8 byte integer to a 4 byte pointer. */
5617 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5618 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5621 /* At this point, ESRCH should mean the process is
5622 already gone, in which case we simply ignore attempts
5623 to change its registers. See also the related
5624 comment in linux_resume_one_lwp. */
5628 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5629 error ("writing register %d: %s", regno
, strerror (errno
));
5631 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5635 /* Fetch all registers, or just one, from the child process.
5636 If REGNO is -1, do this for all registers, skipping any that are
5637 assumed to have been retrieved by regsets_fetch_inferior_registers,
5638 unless ALL is non-zero.
5639 Otherwise, REGNO specifies which register (so we can save time). */
5641 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5642 struct regcache
*regcache
, int regno
, int all
)
5644 struct usrregs_info
*usr
= regs_info
->usrregs
;
5648 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5649 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5650 fetch_register (usr
, regcache
, regno
);
5653 fetch_register (usr
, regcache
, regno
);
5656 /* Store our register values back into the inferior.
5657 If REGNO is -1, do this for all registers, skipping any that are
5658 assumed to have been saved by regsets_store_inferior_registers,
5659 unless ALL is non-zero.
5660 Otherwise, REGNO specifies which register (so we can save time). */
5662 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5663 struct regcache
*regcache
, int regno
, int all
)
5665 struct usrregs_info
*usr
= regs_info
->usrregs
;
5669 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5670 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5671 store_register (usr
, regcache
, regno
);
5674 store_register (usr
, regcache
, regno
);
5677 #else /* !HAVE_LINUX_USRREGS */
5679 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5680 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5686 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5690 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5694 if (the_low_target
.fetch_register
!= NULL
5695 && regs_info
->usrregs
!= NULL
)
5696 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5697 (*the_low_target
.fetch_register
) (regcache
, regno
);
5699 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5700 if (regs_info
->usrregs
!= NULL
)
5701 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5705 if (the_low_target
.fetch_register
!= NULL
5706 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5709 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5711 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5713 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5714 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5719 linux_store_registers (struct regcache
*regcache
, int regno
)
5723 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5727 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5729 if (regs_info
->usrregs
!= NULL
)
5730 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5734 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5736 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5738 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5739 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5744 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5745 to debugger memory starting at MYADDR. */
5748 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5750 int pid
= lwpid_of (current_thread
);
5751 PTRACE_XFER_TYPE
*buffer
;
5759 /* Try using /proc. Don't bother for one word. */
5760 if (len
>= 3 * sizeof (long))
5764 /* We could keep this file open and cache it - possibly one per
5765 thread. That requires some juggling, but is even faster. */
5766 sprintf (filename
, "/proc/%d/mem", pid
);
5767 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5771 /* If pread64 is available, use it. It's faster if the kernel
5772 supports it (only one syscall), and it's 64-bit safe even on
5773 32-bit platforms (for instance, SPARC debugging a SPARC64
5776 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5779 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5780 bytes
= read (fd
, myaddr
, len
);
5787 /* Some data was read, we'll try to get the rest with ptrace. */
5797 /* Round starting address down to longword boundary. */
5798 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5799 /* Round ending address up; get number of longwords that makes. */
5800 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5801 / sizeof (PTRACE_XFER_TYPE
));
5802 /* Allocate buffer of that many longwords. */
5803 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5805 /* Read all the longwords */
5807 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5809 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5810 about coercing an 8 byte integer to a 4 byte pointer. */
5811 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5812 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5813 (PTRACE_TYPE_ARG4
) 0);
5819 /* Copy appropriate bytes out of the buffer. */
5822 i
*= sizeof (PTRACE_XFER_TYPE
);
5823 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5825 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5832 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5833 memory at MEMADDR. On failure (cannot write to the inferior)
5834 returns the value of errno. Always succeeds if LEN is zero. */
5837 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5840 /* Round starting address down to longword boundary. */
5841 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5842 /* Round ending address up; get number of longwords that makes. */
5844 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5845 / sizeof (PTRACE_XFER_TYPE
);
5847 /* Allocate buffer of that many longwords. */
5848 PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5850 int pid
= lwpid_of (current_thread
);
5854 /* Zero length write always succeeds. */
5860 /* Dump up to four bytes. */
5861 char str
[4 * 2 + 1];
5863 int dump
= len
< 4 ? len
: 4;
5865 for (i
= 0; i
< dump
; i
++)
5867 sprintf (p
, "%02x", myaddr
[i
]);
5872 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5873 str
, (long) memaddr
, pid
);
5876 /* Fill start and end extra bytes of buffer with existing memory data. */
5879 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5880 about coercing an 8 byte integer to a 4 byte pointer. */
5881 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5882 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5883 (PTRACE_TYPE_ARG4
) 0);
5891 = ptrace (PTRACE_PEEKTEXT
, pid
,
5892 /* Coerce to a uintptr_t first to avoid potential gcc warning
5893 about coercing an 8 byte integer to a 4 byte pointer. */
5894 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5895 * sizeof (PTRACE_XFER_TYPE
)),
5896 (PTRACE_TYPE_ARG4
) 0);
5901 /* Copy data to be written over corresponding part of buffer. */
5903 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5906 /* Write the entire buffer. */
5908 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5911 ptrace (PTRACE_POKETEXT
, pid
,
5912 /* Coerce to a uintptr_t first to avoid potential gcc warning
5913 about coercing an 8 byte integer to a 4 byte pointer. */
5914 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5915 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5924 linux_look_up_symbols (void)
5926 #ifdef USE_THREAD_DB
5927 struct process_info
*proc
= current_process ();
5929 if (proc
->priv
->thread_db
!= NULL
)
5937 linux_request_interrupt (void)
5939 /* Send a SIGINT to the process group. This acts just like the user
5940 typed a ^C on the controlling terminal. */
5941 kill (-signal_pid
, SIGINT
);
5944 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5945 to debugger memory starting at MYADDR. */
5948 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5950 char filename
[PATH_MAX
];
5952 int pid
= lwpid_of (current_thread
);
5954 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5956 fd
= open (filename
, O_RDONLY
);
5960 if (offset
!= (CORE_ADDR
) 0
5961 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5964 n
= read (fd
, myaddr
, len
);
5971 /* These breakpoint and watchpoint related wrapper functions simply
5972 pass on the function call if the target has registered a
5973 corresponding function. */
5976 linux_supports_z_point_type (char z_type
)
5978 return (the_low_target
.supports_z_point_type
!= NULL
5979 && the_low_target
.supports_z_point_type (z_type
));
5983 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5984 int size
, struct raw_breakpoint
*bp
)
5986 if (type
== raw_bkpt_type_sw
)
5987 return insert_memory_breakpoint (bp
);
5988 else if (the_low_target
.insert_point
!= NULL
)
5989 return the_low_target
.insert_point (type
, addr
, size
, bp
);
5991 /* Unsupported (see target.h). */
5996 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5997 int size
, struct raw_breakpoint
*bp
)
5999 if (type
== raw_bkpt_type_sw
)
6000 return remove_memory_breakpoint (bp
);
6001 else if (the_low_target
.remove_point
!= NULL
)
6002 return the_low_target
.remove_point (type
, addr
, size
, bp
);
6004 /* Unsupported (see target.h). */
6008 /* Implement the to_stopped_by_sw_breakpoint target_ops
6012 linux_stopped_by_sw_breakpoint (void)
6014 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6016 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
6019 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
6023 linux_supports_stopped_by_sw_breakpoint (void)
6025 return USE_SIGTRAP_SIGINFO
;
6028 /* Implement the to_stopped_by_hw_breakpoint target_ops
6032 linux_stopped_by_hw_breakpoint (void)
6034 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6036 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6039 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6043 linux_supports_stopped_by_hw_breakpoint (void)
6045 return USE_SIGTRAP_SIGINFO
;
6048 /* Implement the supports_hardware_single_step target_ops method. */
6051 linux_supports_hardware_single_step (void)
6053 return can_hardware_single_step ();
6057 linux_supports_software_single_step (void)
6059 return can_software_single_step ();
6063 linux_stopped_by_watchpoint (void)
6065 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6067 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6071 linux_stopped_data_address (void)
6073 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6075 return lwp
->stopped_data_address
;
6078 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6079 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6080 && defined(PT_TEXT_END_ADDR)
6082 /* This is only used for targets that define PT_TEXT_ADDR,
6083 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6084 the target has different ways of acquiring this information, like
6087 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6088 to tell gdb about. */
6091 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6093 unsigned long text
, text_end
, data
;
6094 int pid
= lwpid_of (current_thread
);
6098 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6099 (PTRACE_TYPE_ARG4
) 0);
6100 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6101 (PTRACE_TYPE_ARG4
) 0);
6102 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6103 (PTRACE_TYPE_ARG4
) 0);
6107 /* Both text and data offsets produced at compile-time (and so
6108 used by gdb) are relative to the beginning of the program,
6109 with the data segment immediately following the text segment.
6110 However, the actual runtime layout in memory may put the data
6111 somewhere else, so when we send gdb a data base-address, we
6112 use the real data base address and subtract the compile-time
6113 data base-address from it (which is just the length of the
6114 text segment). BSS immediately follows data in both
6117 *data_p
= data
- (text_end
- text
);
6126 linux_qxfer_osdata (const char *annex
,
6127 unsigned char *readbuf
, unsigned const char *writebuf
,
6128 CORE_ADDR offset
, int len
)
6130 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6133 /* Convert a native/host siginfo object, into/from the siginfo in the
6134 layout of the inferiors' architecture. */
6137 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6141 if (the_low_target
.siginfo_fixup
!= NULL
)
6142 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6144 /* If there was no callback, or the callback didn't do anything,
6145 then just do a straight memcpy. */
6149 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6151 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6156 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6157 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6161 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6163 if (current_thread
== NULL
)
6166 pid
= lwpid_of (current_thread
);
6169 debug_printf ("%s siginfo for lwp %d.\n",
6170 readbuf
!= NULL
? "Reading" : "Writing",
6173 if (offset
>= sizeof (siginfo
))
6176 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6179 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6180 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6181 inferior with a 64-bit GDBSERVER should look the same as debugging it
6182 with a 32-bit GDBSERVER, we need to convert it. */
6183 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6185 if (offset
+ len
> sizeof (siginfo
))
6186 len
= sizeof (siginfo
) - offset
;
6188 if (readbuf
!= NULL
)
6189 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6192 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6194 /* Convert back to ptrace layout before flushing it out. */
6195 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6197 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6204 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6205 so we notice when children change state; as the handler for the
6206 sigsuspend in my_waitpid. */
6209 sigchld_handler (int signo
)
6211 int old_errno
= errno
;
6217 /* fprintf is not async-signal-safe, so call write
6219 if (write (2, "sigchld_handler\n",
6220 sizeof ("sigchld_handler\n") - 1) < 0)
6221 break; /* just ignore */
6225 if (target_is_async_p ())
6226 async_file_mark (); /* trigger a linux_wait */
6232 linux_supports_non_stop (void)
6238 linux_async (int enable
)
6240 int previous
= target_is_async_p ();
6243 debug_printf ("linux_async (%d), previous=%d\n",
6246 if (previous
!= enable
)
6249 sigemptyset (&mask
);
6250 sigaddset (&mask
, SIGCHLD
);
6252 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6256 if (pipe (linux_event_pipe
) == -1)
6258 linux_event_pipe
[0] = -1;
6259 linux_event_pipe
[1] = -1;
6260 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6262 warning ("creating event pipe failed.");
6266 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6267 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6269 /* Register the event loop handler. */
6270 add_file_handler (linux_event_pipe
[0],
6271 handle_target_event
, NULL
);
6273 /* Always trigger a linux_wait. */
6278 delete_file_handler (linux_event_pipe
[0]);
6280 close (linux_event_pipe
[0]);
6281 close (linux_event_pipe
[1]);
6282 linux_event_pipe
[0] = -1;
6283 linux_event_pipe
[1] = -1;
6286 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6293 linux_start_non_stop (int nonstop
)
6295 /* Register or unregister from event-loop accordingly. */
6296 linux_async (nonstop
);
6298 if (target_is_async_p () != (nonstop
!= 0))
6305 linux_supports_multi_process (void)
6310 /* Check if fork events are supported. */
6313 linux_supports_fork_events (void)
6315 return linux_supports_tracefork ();
6318 /* Check if vfork events are supported. */
6321 linux_supports_vfork_events (void)
6323 return linux_supports_tracefork ();
6326 /* Check if exec events are supported. */
6329 linux_supports_exec_events (void)
6331 return linux_supports_traceexec ();
6334 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6335 ptrace flags for all inferiors. This is in case the new GDB connection
6336 doesn't support the same set of events that the previous one did. */
6339 linux_handle_new_gdb_connection (void)
6341 /* Request that all the lwps reset their ptrace options. */
6342 for_each_thread ([] (thread_info
*thread
)
6344 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6348 /* Stop the lwp so we can modify its ptrace options. */
6349 lwp
->must_set_ptrace_flags
= 1;
6350 linux_stop_lwp (lwp
);
6354 /* Already stopped; go ahead and set the ptrace options. */
6355 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6356 int options
= linux_low_ptrace_options (proc
->attached
);
6358 linux_enable_event_reporting (lwpid_of (thread
), options
);
6359 lwp
->must_set_ptrace_flags
= 0;
6365 linux_supports_disable_randomization (void)
6367 #ifdef HAVE_PERSONALITY
6375 linux_supports_agent (void)
6381 linux_supports_range_stepping (void)
6383 if (can_software_single_step ())
6385 if (*the_low_target
.supports_range_stepping
== NULL
)
6388 return (*the_low_target
.supports_range_stepping
) ();
6391 /* Enumerate spufs IDs for process PID. */
6393 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6399 struct dirent
*entry
;
6401 sprintf (path
, "/proc/%ld/fd", pid
);
6402 dir
= opendir (path
);
6407 while ((entry
= readdir (dir
)) != NULL
)
6413 fd
= atoi (entry
->d_name
);
6417 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6418 if (stat (path
, &st
) != 0)
6420 if (!S_ISDIR (st
.st_mode
))
6423 if (statfs (path
, &stfs
) != 0)
6425 if (stfs
.f_type
!= SPUFS_MAGIC
)
6428 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6430 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6440 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6441 object type, using the /proc file system. */
6443 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6444 unsigned const char *writebuf
,
6445 CORE_ADDR offset
, int len
)
6447 long pid
= lwpid_of (current_thread
);
6452 if (!writebuf
&& !readbuf
)
6460 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6463 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6464 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6469 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6476 ret
= write (fd
, writebuf
, (size_t) len
);
6478 ret
= read (fd
, readbuf
, (size_t) len
);
6484 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6485 struct target_loadseg
6487 /* Core address to which the segment is mapped. */
6489 /* VMA recorded in the program header. */
6491 /* Size of this segment in memory. */
6495 # if defined PT_GETDSBT
6496 struct target_loadmap
6498 /* Protocol version number, must be zero. */
6500 /* Pointer to the DSBT table, its size, and the DSBT index. */
6501 unsigned *dsbt_table
;
6502 unsigned dsbt_size
, dsbt_index
;
6503 /* Number of segments in this map. */
6505 /* The actual memory map. */
6506 struct target_loadseg segs
[/*nsegs*/];
6508 # define LINUX_LOADMAP PT_GETDSBT
6509 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6510 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6512 struct target_loadmap
6514 /* Protocol version number, must be zero. */
6516 /* Number of segments in this map. */
6518 /* The actual memory map. */
6519 struct target_loadseg segs
[/*nsegs*/];
6521 # define LINUX_LOADMAP PTRACE_GETFDPIC
6522 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6523 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6527 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6528 unsigned char *myaddr
, unsigned int len
)
6530 int pid
= lwpid_of (current_thread
);
6532 struct target_loadmap
*data
= NULL
;
6533 unsigned int actual_length
, copy_length
;
6535 if (strcmp (annex
, "exec") == 0)
6536 addr
= (int) LINUX_LOADMAP_EXEC
;
6537 else if (strcmp (annex
, "interp") == 0)
6538 addr
= (int) LINUX_LOADMAP_INTERP
;
6542 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6548 actual_length
= sizeof (struct target_loadmap
)
6549 + sizeof (struct target_loadseg
) * data
->nsegs
;
6551 if (offset
< 0 || offset
> actual_length
)
6554 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6555 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6559 # define linux_read_loadmap NULL
6560 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6563 linux_process_qsupported (char **features
, int count
)
6565 if (the_low_target
.process_qsupported
!= NULL
)
6566 the_low_target
.process_qsupported (features
, count
);
6570 linux_supports_catch_syscall (void)
6572 return (the_low_target
.get_syscall_trapinfo
!= NULL
6573 && linux_supports_tracesysgood ());
6577 linux_get_ipa_tdesc_idx (void)
6579 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6582 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6586 linux_supports_tracepoints (void)
6588 if (*the_low_target
.supports_tracepoints
== NULL
)
6591 return (*the_low_target
.supports_tracepoints
) ();
6595 linux_read_pc (struct regcache
*regcache
)
6597 if (the_low_target
.get_pc
== NULL
)
6600 return (*the_low_target
.get_pc
) (regcache
);
6604 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6606 gdb_assert (the_low_target
.set_pc
!= NULL
);
6608 (*the_low_target
.set_pc
) (regcache
, pc
);
6612 linux_thread_stopped (struct thread_info
*thread
)
6614 return get_thread_lwp (thread
)->stopped
;
6617 /* This exposes stop-all-threads functionality to other modules. */
6620 linux_pause_all (int freeze
)
6622 stop_all_lwps (freeze
, NULL
);
6625 /* This exposes unstop-all-threads functionality to other gdbserver
6629 linux_unpause_all (int unfreeze
)
6631 unstop_all_lwps (unfreeze
, NULL
);
6635 linux_prepare_to_access_memory (void)
6637 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6640 linux_pause_all (1);
6645 linux_done_accessing_memory (void)
6647 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6650 linux_unpause_all (1);
6654 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6655 CORE_ADDR collector
,
6658 CORE_ADDR
*jump_entry
,
6659 CORE_ADDR
*trampoline
,
6660 ULONGEST
*trampoline_size
,
6661 unsigned char *jjump_pad_insn
,
6662 ULONGEST
*jjump_pad_insn_size
,
6663 CORE_ADDR
*adjusted_insn_addr
,
6664 CORE_ADDR
*adjusted_insn_addr_end
,
6667 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6668 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6669 jump_entry
, trampoline
, trampoline_size
,
6670 jjump_pad_insn
, jjump_pad_insn_size
,
6671 adjusted_insn_addr
, adjusted_insn_addr_end
,
6675 static struct emit_ops
*
6676 linux_emit_ops (void)
6678 if (the_low_target
.emit_ops
!= NULL
)
6679 return (*the_low_target
.emit_ops
) ();
6685 linux_get_min_fast_tracepoint_insn_len (void)
6687 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6690 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6693 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6694 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6696 char filename
[PATH_MAX
];
6698 const int auxv_size
= is_elf64
6699 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6700 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6702 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6704 fd
= open (filename
, O_RDONLY
);
6710 while (read (fd
, buf
, auxv_size
) == auxv_size
6711 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6715 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6717 switch (aux
->a_type
)
6720 *phdr_memaddr
= aux
->a_un
.a_val
;
6723 *num_phdr
= aux
->a_un
.a_val
;
6729 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6731 switch (aux
->a_type
)
6734 *phdr_memaddr
= aux
->a_un
.a_val
;
6737 *num_phdr
= aux
->a_un
.a_val
;
6745 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6747 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6748 "phdr_memaddr = %ld, phdr_num = %d",
6749 (long) *phdr_memaddr
, *num_phdr
);
6756 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6759 get_dynamic (const int pid
, const int is_elf64
)
6761 CORE_ADDR phdr_memaddr
, relocation
;
6763 unsigned char *phdr_buf
;
6764 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6766 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6769 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6770 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6772 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6775 /* Compute relocation: it is expected to be 0 for "regular" executables,
6776 non-zero for PIE ones. */
6778 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6781 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6783 if (p
->p_type
== PT_PHDR
)
6784 relocation
= phdr_memaddr
- p
->p_vaddr
;
6788 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6790 if (p
->p_type
== PT_PHDR
)
6791 relocation
= phdr_memaddr
- p
->p_vaddr
;
6794 if (relocation
== -1)
6796 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6797 any real world executables, including PIE executables, have always
6798 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6799 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6800 or present DT_DEBUG anyway (fpc binaries are statically linked).
6802 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6804 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6809 for (i
= 0; i
< num_phdr
; i
++)
6813 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6815 if (p
->p_type
== PT_DYNAMIC
)
6816 return p
->p_vaddr
+ relocation
;
6820 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6822 if (p
->p_type
== PT_DYNAMIC
)
6823 return p
->p_vaddr
+ relocation
;
6830 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6831 can be 0 if the inferior does not yet have the library list initialized.
6832 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6833 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6836 get_r_debug (const int pid
, const int is_elf64
)
6838 CORE_ADDR dynamic_memaddr
;
6839 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6840 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6843 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6844 if (dynamic_memaddr
== 0)
6847 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6851 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6852 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6856 unsigned char buf
[sizeof (Elf64_Xword
)];
6860 #ifdef DT_MIPS_RLD_MAP
6861 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6863 if (linux_read_memory (dyn
->d_un
.d_val
,
6864 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6869 #endif /* DT_MIPS_RLD_MAP */
6870 #ifdef DT_MIPS_RLD_MAP_REL
6871 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6873 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6874 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6879 #endif /* DT_MIPS_RLD_MAP_REL */
6881 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6882 map
= dyn
->d_un
.d_val
;
6884 if (dyn
->d_tag
== DT_NULL
)
6889 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6890 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6894 unsigned char buf
[sizeof (Elf32_Word
)];
6898 #ifdef DT_MIPS_RLD_MAP
6899 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6901 if (linux_read_memory (dyn
->d_un
.d_val
,
6902 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6907 #endif /* DT_MIPS_RLD_MAP */
6908 #ifdef DT_MIPS_RLD_MAP_REL
6909 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6911 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6912 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6917 #endif /* DT_MIPS_RLD_MAP_REL */
6919 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6920 map
= dyn
->d_un
.d_val
;
6922 if (dyn
->d_tag
== DT_NULL
)
6926 dynamic_memaddr
+= dyn_size
;
6932 /* Read one pointer from MEMADDR in the inferior. */
6935 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6939 /* Go through a union so this works on either big or little endian
6940 hosts, when the inferior's pointer size is smaller than the size
6941 of CORE_ADDR. It is assumed the inferior's endianness is the
6942 same of the superior's. */
6945 CORE_ADDR core_addr
;
6950 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6953 if (ptr_size
== sizeof (CORE_ADDR
))
6954 *ptr
= addr
.core_addr
;
6955 else if (ptr_size
== sizeof (unsigned int))
6958 gdb_assert_not_reached ("unhandled pointer size");
6963 struct link_map_offsets
6965 /* Offset and size of r_debug.r_version. */
6966 int r_version_offset
;
6968 /* Offset and size of r_debug.r_map. */
6971 /* Offset to l_addr field in struct link_map. */
6974 /* Offset to l_name field in struct link_map. */
6977 /* Offset to l_ld field in struct link_map. */
6980 /* Offset to l_next field in struct link_map. */
6983 /* Offset to l_prev field in struct link_map. */
6987 /* Construct qXfer:libraries-svr4:read reply. */
6990 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
6991 unsigned const char *writebuf
,
6992 CORE_ADDR offset
, int len
)
6994 struct process_info_private
*const priv
= current_process ()->priv
;
6995 char filename
[PATH_MAX
];
6998 static const struct link_map_offsets lmo_32bit_offsets
=
7000 0, /* r_version offset. */
7001 4, /* r_debug.r_map offset. */
7002 0, /* l_addr offset in link_map. */
7003 4, /* l_name offset in link_map. */
7004 8, /* l_ld offset in link_map. */
7005 12, /* l_next offset in link_map. */
7006 16 /* l_prev offset in link_map. */
7009 static const struct link_map_offsets lmo_64bit_offsets
=
7011 0, /* r_version offset. */
7012 8, /* r_debug.r_map offset. */
7013 0, /* l_addr offset in link_map. */
7014 8, /* l_name offset in link_map. */
7015 16, /* l_ld offset in link_map. */
7016 24, /* l_next offset in link_map. */
7017 32 /* l_prev offset in link_map. */
7019 const struct link_map_offsets
*lmo
;
7020 unsigned int machine
;
7022 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7023 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7024 int header_done
= 0;
7026 if (writebuf
!= NULL
)
7028 if (readbuf
== NULL
)
7031 pid
= lwpid_of (current_thread
);
7032 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7033 is_elf64
= elf_64_file_p (filename
, &machine
);
7034 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7035 ptr_size
= is_elf64
? 8 : 4;
7037 while (annex
[0] != '\0')
7043 sep
= strchr (annex
, '=');
7047 name_len
= sep
- annex
;
7048 if (name_len
== 5 && startswith (annex
, "start"))
7050 else if (name_len
== 4 && startswith (annex
, "prev"))
7054 annex
= strchr (sep
, ';');
7061 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7068 if (priv
->r_debug
== 0)
7069 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7071 /* We failed to find DT_DEBUG. Such situation will not change
7072 for this inferior - do not retry it. Report it to GDB as
7073 E01, see for the reasons at the GDB solib-svr4.c side. */
7074 if (priv
->r_debug
== (CORE_ADDR
) -1)
7077 if (priv
->r_debug
!= 0)
7079 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7080 (unsigned char *) &r_version
,
7081 sizeof (r_version
)) != 0
7084 warning ("unexpected r_debug version %d", r_version
);
7086 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7087 &lm_addr
, ptr_size
) != 0)
7089 warning ("unable to read r_map from 0x%lx",
7090 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7095 std::string document
= "<library-list-svr4 version=\"1.0\"";
7098 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7099 &l_name
, ptr_size
) == 0
7100 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7101 &l_addr
, ptr_size
) == 0
7102 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7103 &l_ld
, ptr_size
) == 0
7104 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7105 &l_prev
, ptr_size
) == 0
7106 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7107 &l_next
, ptr_size
) == 0)
7109 unsigned char libname
[PATH_MAX
];
7111 if (lm_prev
!= l_prev
)
7113 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7114 (long) lm_prev
, (long) l_prev
);
7118 /* Ignore the first entry even if it has valid name as the first entry
7119 corresponds to the main executable. The first entry should not be
7120 skipped if the dynamic loader was loaded late by a static executable
7121 (see solib-svr4.c parameter ignore_first). But in such case the main
7122 executable does not have PT_DYNAMIC present and this function already
7123 exited above due to failed get_r_debug. */
7125 string_appendf (document
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7128 /* Not checking for error because reading may stop before
7129 we've got PATH_MAX worth of characters. */
7131 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7132 libname
[sizeof (libname
) - 1] = '\0';
7133 if (libname
[0] != '\0')
7137 /* Terminate `<library-list-svr4'. */
7142 string_appendf (document
, "<library name=\"");
7143 xml_escape_text_append (&document
, (char *) libname
);
7144 string_appendf (document
, "\" lm=\"0x%lx\" "
7145 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7146 (unsigned long) lm_addr
, (unsigned long) l_addr
,
7147 (unsigned long) l_ld
);
7157 /* Empty list; terminate `<library-list-svr4'. */
7161 document
+= "</library-list-svr4>";
7163 int document_len
= document
.length ();
7164 if (offset
< document_len
)
7165 document_len
-= offset
;
7168 if (len
> document_len
)
7171 memcpy (readbuf
, document
.data () + offset
, len
);
7176 #ifdef HAVE_LINUX_BTRACE
7178 /* See to_disable_btrace target method. */
7181 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7183 enum btrace_error err
;
7185 err
= linux_disable_btrace (tinfo
);
7186 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7189 /* Encode an Intel Processor Trace configuration. */
7192 linux_low_encode_pt_config (struct buffer
*buffer
,
7193 const struct btrace_data_pt_config
*config
)
7195 buffer_grow_str (buffer
, "<pt-config>\n");
7197 switch (config
->cpu
.vendor
)
7200 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7201 "model=\"%u\" stepping=\"%u\"/>\n",
7202 config
->cpu
.family
, config
->cpu
.model
,
7203 config
->cpu
.stepping
);
7210 buffer_grow_str (buffer
, "</pt-config>\n");
7213 /* Encode a raw buffer. */
7216 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7222 /* We use hex encoding - see common/rsp-low.h. */
7223 buffer_grow_str (buffer
, "<raw>\n");
7229 elem
[0] = tohex ((*data
>> 4) & 0xf);
7230 elem
[1] = tohex (*data
++ & 0xf);
7232 buffer_grow (buffer
, elem
, 2);
7235 buffer_grow_str (buffer
, "</raw>\n");
7238 /* See to_read_btrace target method. */
7241 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7242 enum btrace_read_type type
)
7244 struct btrace_data btrace
;
7245 struct btrace_block
*block
;
7246 enum btrace_error err
;
7249 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7250 if (err
!= BTRACE_ERR_NONE
)
7252 if (err
== BTRACE_ERR_OVERFLOW
)
7253 buffer_grow_str0 (buffer
, "E.Overflow.");
7255 buffer_grow_str0 (buffer
, "E.Generic Error.");
7260 switch (btrace
.format
)
7262 case BTRACE_FORMAT_NONE
:
7263 buffer_grow_str0 (buffer
, "E.No Trace.");
7266 case BTRACE_FORMAT_BTS
:
7267 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7268 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7271 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7273 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7274 paddress (block
->begin
), paddress (block
->end
));
7276 buffer_grow_str0 (buffer
, "</btrace>\n");
7279 case BTRACE_FORMAT_PT
:
7280 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7281 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7282 buffer_grow_str (buffer
, "<pt>\n");
7284 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7286 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7287 btrace
.variant
.pt
.size
);
7289 buffer_grow_str (buffer
, "</pt>\n");
7290 buffer_grow_str0 (buffer
, "</btrace>\n");
7294 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7301 /* See to_btrace_conf target method. */
7304 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7305 struct buffer
*buffer
)
7307 const struct btrace_config
*conf
;
7309 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7310 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7312 conf
= linux_btrace_conf (tinfo
);
7315 switch (conf
->format
)
7317 case BTRACE_FORMAT_NONE
:
7320 case BTRACE_FORMAT_BTS
:
7321 buffer_xml_printf (buffer
, "<bts");
7322 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7323 buffer_xml_printf (buffer
, " />\n");
7326 case BTRACE_FORMAT_PT
:
7327 buffer_xml_printf (buffer
, "<pt");
7328 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7329 buffer_xml_printf (buffer
, "/>\n");
7334 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7337 #endif /* HAVE_LINUX_BTRACE */
7339 /* See nat/linux-nat.h. */
7342 current_lwp_ptid (void)
7344 return ptid_of (current_thread
);
7347 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7350 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7352 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7353 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7355 return default_breakpoint_kind_from_pc (pcptr
);
7358 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7360 static const gdb_byte
*
7361 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7363 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7365 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7368 /* Implementation of the target_ops method
7369 "breakpoint_kind_from_current_state". */
7372 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7374 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7375 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7377 return linux_breakpoint_kind_from_pc (pcptr
);
7380 /* Default implementation of linux_target_ops method "set_pc" for
7381 32-bit pc register which is literally named "pc". */
7384 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7386 uint32_t newpc
= pc
;
7388 supply_register_by_name (regcache
, "pc", &newpc
);
7391 /* Default implementation of linux_target_ops method "get_pc" for
7392 32-bit pc register which is literally named "pc". */
7395 linux_get_pc_32bit (struct regcache
*regcache
)
7399 collect_register_by_name (regcache
, "pc", &pc
);
7401 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7405 /* Default implementation of linux_target_ops method "set_pc" for
7406 64-bit pc register which is literally named "pc". */
7409 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7411 uint64_t newpc
= pc
;
7413 supply_register_by_name (regcache
, "pc", &newpc
);
7416 /* Default implementation of linux_target_ops method "get_pc" for
7417 64-bit pc register which is literally named "pc". */
7420 linux_get_pc_64bit (struct regcache
*regcache
)
7424 collect_register_by_name (regcache
, "pc", &pc
);
7426 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7430 /* Fetch the entry MATCH from the auxv vector, where entries are length
7431 WORDSIZE. If no entry was found, return zero. */
7434 linux_get_auxv (int wordsize
, CORE_ADDR match
)
7436 gdb_byte
*data
= (gdb_byte
*) alloca (2 * wordsize
);
7439 gdb_assert (wordsize
== 4 || wordsize
== 8);
7441 while ((*the_target
->read_auxv
) (offset
, data
, 2 * wordsize
) == 2 * wordsize
)
7445 uint32_t *data_p
= (uint32_t *)data
;
7446 if (data_p
[0] == match
)
7451 uint64_t *data_p
= (uint64_t *)data
;
7452 if (data_p
[0] == match
)
7456 offset
+= 2 * wordsize
;
7462 /* See linux-low.h. */
7465 linux_get_hwcap (int wordsize
)
7467 return linux_get_auxv (wordsize
, AT_HWCAP
);
7470 /* See linux-low.h. */
7473 linux_get_hwcap2 (int wordsize
)
7475 return linux_get_auxv (wordsize
, AT_HWCAP2
);
7478 static struct target_ops linux_target_ops
= {
7479 linux_create_inferior
,
7480 linux_post_create_inferior
,
7489 linux_fetch_registers
,
7490 linux_store_registers
,
7491 linux_prepare_to_access_memory
,
7492 linux_done_accessing_memory
,
7495 linux_look_up_symbols
,
7496 linux_request_interrupt
,
7498 linux_supports_z_point_type
,
7501 linux_stopped_by_sw_breakpoint
,
7502 linux_supports_stopped_by_sw_breakpoint
,
7503 linux_stopped_by_hw_breakpoint
,
7504 linux_supports_stopped_by_hw_breakpoint
,
7505 linux_supports_hardware_single_step
,
7506 linux_stopped_by_watchpoint
,
7507 linux_stopped_data_address
,
7508 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7509 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7510 && defined(PT_TEXT_END_ADDR)
7515 #ifdef USE_THREAD_DB
7516 thread_db_get_tls_address
,
7521 hostio_last_error_from_errno
,
7524 linux_supports_non_stop
,
7526 linux_start_non_stop
,
7527 linux_supports_multi_process
,
7528 linux_supports_fork_events
,
7529 linux_supports_vfork_events
,
7530 linux_supports_exec_events
,
7531 linux_handle_new_gdb_connection
,
7532 #ifdef USE_THREAD_DB
7533 thread_db_handle_monitor_command
,
7537 linux_common_core_of_thread
,
7539 linux_process_qsupported
,
7540 linux_supports_tracepoints
,
7543 linux_thread_stopped
,
7547 linux_stabilize_threads
,
7548 linux_install_fast_tracepoint_jump_pad
,
7550 linux_supports_disable_randomization
,
7551 linux_get_min_fast_tracepoint_insn_len
,
7552 linux_qxfer_libraries_svr4
,
7553 linux_supports_agent
,
7554 #ifdef HAVE_LINUX_BTRACE
7555 linux_enable_btrace
,
7556 linux_low_disable_btrace
,
7557 linux_low_read_btrace
,
7558 linux_low_btrace_conf
,
7565 linux_supports_range_stepping
,
7566 linux_proc_pid_to_exec_file
,
7567 linux_mntns_open_cloexec
,
7569 linux_mntns_readlink
,
7570 linux_breakpoint_kind_from_pc
,
7571 linux_sw_breakpoint_from_kind
,
7572 linux_proc_tid_get_name
,
7573 linux_breakpoint_kind_from_current_state
,
7574 linux_supports_software_single_step
,
7575 linux_supports_catch_syscall
,
7576 linux_get_ipa_tdesc_idx
,
7578 thread_db_thread_handle
,
7584 #ifdef HAVE_LINUX_REGSETS
7586 initialize_regsets_info (struct regsets_info
*info
)
7588 for (info
->num_regsets
= 0;
7589 info
->regsets
[info
->num_regsets
].size
>= 0;
7590 info
->num_regsets
++)
7596 initialize_low (void)
7598 struct sigaction sigchld_action
;
7600 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7601 set_target_ops (&linux_target_ops
);
7603 linux_ptrace_init_warnings ();
7604 linux_proc_init_warnings ();
7606 sigchld_action
.sa_handler
= sigchld_handler
;
7607 sigemptyset (&sigchld_action
.sa_mask
);
7608 sigchld_action
.sa_flags
= SA_RESTART
;
7609 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7611 initialize_low_arch ();
7613 linux_check_ptrace_features ();