1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2017 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "linux-low.h"
21 #include "nat/linux-osdata.h"
25 #include "signals-state-save-restore.h"
26 #include "nat/linux-nat.h"
27 #include "nat/linux-waitpid.h"
29 #include "nat/gdb_ptrace.h"
30 #include "nat/linux-ptrace.h"
31 #include "nat/linux-procfs.h"
32 #include "nat/linux-personality.h"
34 #include <sys/ioctl.h>
37 #include <sys/syscall.h>
41 #include <sys/types.h>
46 #include "filestuff.h"
47 #include "tracepoint.h"
50 #include "common-inferior.h"
51 #include "nat/fork-inferior.h"
54 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
55 then ELFMAG0 will have been defined. If it didn't get included by
56 gdb_proc_service.h then including it will likely introduce a duplicate
57 definition of elf_fpregset_t. */
60 #include "nat/linux-namespaces.h"
63 #define SPUFS_MAGIC 0x23c9b64e
66 #ifdef HAVE_PERSONALITY
67 # include <sys/personality.h>
68 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
69 # define ADDR_NO_RANDOMIZE 0x0040000
77 /* Some targets did not define these ptrace constants from the start,
78 so gdbserver defines them locally here. In the future, these may
79 be removed after they are added to asm/ptrace.h. */
80 #if !(defined(PT_TEXT_ADDR) \
81 || defined(PT_DATA_ADDR) \
82 || defined(PT_TEXT_END_ADDR))
83 #if defined(__mcoldfire__)
84 /* These are still undefined in 3.10 kernels. */
85 #define PT_TEXT_ADDR 49*4
86 #define PT_DATA_ADDR 50*4
87 #define PT_TEXT_END_ADDR 51*4
88 /* BFIN already defines these since at least 2.6.32 kernels. */
90 #define PT_TEXT_ADDR 220
91 #define PT_TEXT_END_ADDR 224
92 #define PT_DATA_ADDR 228
93 /* These are still undefined in 3.10 kernels. */
94 #elif defined(__TMS320C6X__)
95 #define PT_TEXT_ADDR (0x10000*4)
96 #define PT_DATA_ADDR (0x10004*4)
97 #define PT_TEXT_END_ADDR (0x10008*4)
101 #ifdef HAVE_LINUX_BTRACE
102 # include "nat/linux-btrace.h"
103 # include "btrace-common.h"
106 #ifndef HAVE_ELF32_AUXV_T
107 /* Copied from glibc's elf.h. */
110 uint32_t a_type
; /* Entry type */
113 uint32_t a_val
; /* Integer value */
114 /* We use to have pointer elements added here. We cannot do that,
115 though, since it does not work when using 32-bit definitions
116 on 64-bit platforms and vice versa. */
121 #ifndef HAVE_ELF64_AUXV_T
122 /* Copied from glibc's elf.h. */
125 uint64_t a_type
; /* Entry type */
128 uint64_t a_val
; /* Integer value */
129 /* We use to have pointer elements added here. We cannot do that,
130 though, since it does not work when using 32-bit definitions
131 on 64-bit platforms and vice versa. */
136 /* Does the current host support PTRACE_GETREGSET? */
137 int have_ptrace_getregset
= -1;
141 /* See nat/linux-nat.h. */
144 ptid_of_lwp (struct lwp_info
*lwp
)
146 return ptid_of (get_lwp_thread (lwp
));
149 /* See nat/linux-nat.h. */
152 lwp_set_arch_private_info (struct lwp_info
*lwp
,
153 struct arch_lwp_info
*info
)
155 lwp
->arch_private
= info
;
158 /* See nat/linux-nat.h. */
160 struct arch_lwp_info
*
161 lwp_arch_private_info (struct lwp_info
*lwp
)
163 return lwp
->arch_private
;
166 /* See nat/linux-nat.h. */
169 lwp_is_stopped (struct lwp_info
*lwp
)
174 /* See nat/linux-nat.h. */
176 enum target_stop_reason
177 lwp_stop_reason (struct lwp_info
*lwp
)
179 return lwp
->stop_reason
;
182 /* See nat/linux-nat.h. */
185 lwp_is_stepping (struct lwp_info
*lwp
)
187 return lwp
->stepping
;
190 /* A list of all unknown processes which receive stop signals. Some
191 other process will presumably claim each of these as forked
192 children momentarily. */
194 struct simple_pid_list
196 /* The process ID. */
199 /* The status as reported by waitpid. */
203 struct simple_pid_list
*next
;
205 struct simple_pid_list
*stopped_pids
;
207 /* Trivial list manipulation functions to keep track of a list of new
208 stopped processes. */
211 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
213 struct simple_pid_list
*new_pid
= XNEW (struct simple_pid_list
);
216 new_pid
->status
= status
;
217 new_pid
->next
= *listp
;
222 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
224 struct simple_pid_list
**p
;
226 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
227 if ((*p
)->pid
== pid
)
229 struct simple_pid_list
*next
= (*p
)->next
;
231 *statusp
= (*p
)->status
;
239 enum stopping_threads_kind
241 /* Not stopping threads presently. */
242 NOT_STOPPING_THREADS
,
244 /* Stopping threads. */
247 /* Stopping and suspending threads. */
248 STOPPING_AND_SUSPENDING_THREADS
251 /* This is set while stop_all_lwps is in effect. */
252 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
254 /* FIXME make into a target method? */
255 int using_threads
= 1;
257 /* True if we're presently stabilizing threads (moving them out of
259 static int stabilizing_threads
;
261 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
262 int step
, int signal
, siginfo_t
*info
);
263 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
264 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
265 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
266 static void unsuspend_all_lwps (struct lwp_info
*except
);
267 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
268 int *wstat
, int options
);
269 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
270 static struct lwp_info
*add_lwp (ptid_t ptid
);
271 static void linux_mourn (struct process_info
*process
);
272 static int linux_stopped_by_watchpoint (void);
273 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
274 static int lwp_is_marked_dead (struct lwp_info
*lwp
);
275 static void proceed_all_lwps (void);
276 static int finish_step_over (struct lwp_info
*lwp
);
277 static int kill_lwp (unsigned long lwpid
, int signo
);
278 static void enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
);
279 static void complete_ongoing_step_over (void);
280 static int linux_low_ptrace_options (int attached
);
281 static int check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
);
282 static int proceed_one_lwp (thread_info
*thread
, void *except
);
284 /* When the event-loop is doing a step-over, this points at the thread
286 ptid_t step_over_bkpt
;
288 /* True if the low target can hardware single-step. */
291 can_hardware_single_step (void)
293 if (the_low_target
.supports_hardware_single_step
!= NULL
)
294 return the_low_target
.supports_hardware_single_step ();
299 /* True if the low target can software single-step. Such targets
300 implement the GET_NEXT_PCS callback. */
303 can_software_single_step (void)
305 return (the_low_target
.get_next_pcs
!= NULL
);
308 /* True if the low target supports memory breakpoints. If so, we'll
309 have a GET_PC implementation. */
312 supports_breakpoints (void)
314 return (the_low_target
.get_pc
!= NULL
);
317 /* Returns true if this target can support fast tracepoints. This
318 does not mean that the in-process agent has been loaded in the
322 supports_fast_tracepoints (void)
324 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
327 /* True if LWP is stopped in its stepping range. */
330 lwp_in_step_range (struct lwp_info
*lwp
)
332 CORE_ADDR pc
= lwp
->stop_pc
;
334 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
337 struct pending_signals
341 struct pending_signals
*prev
;
344 /* The read/write ends of the pipe registered as waitable file in the
346 static int linux_event_pipe
[2] = { -1, -1 };
348 /* True if we're currently in async mode. */
349 #define target_is_async_p() (linux_event_pipe[0] != -1)
351 static void send_sigstop (struct lwp_info
*lwp
);
352 static void wait_for_sigstop (void);
354 /* Return non-zero if HEADER is a 64-bit ELF file. */
357 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
359 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
360 && header
->e_ident
[EI_MAG1
] == ELFMAG1
361 && header
->e_ident
[EI_MAG2
] == ELFMAG2
362 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
364 *machine
= header
->e_machine
;
365 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
372 /* Return non-zero if FILE is a 64-bit ELF file,
373 zero if the file is not a 64-bit ELF file,
374 and -1 if the file is not accessible or doesn't exist. */
377 elf_64_file_p (const char *file
, unsigned int *machine
)
382 fd
= open (file
, O_RDONLY
);
386 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
393 return elf_64_header_p (&header
, machine
);
396 /* Accepts an integer PID; Returns true if the executable PID is
397 running is a 64-bit ELF file.. */
400 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
404 sprintf (file
, "/proc/%d/exe", pid
);
405 return elf_64_file_p (file
, machine
);
409 delete_lwp (struct lwp_info
*lwp
)
411 struct thread_info
*thr
= get_lwp_thread (lwp
);
414 debug_printf ("deleting %ld\n", lwpid_of (thr
));
418 if (the_low_target
.delete_thread
!= NULL
)
419 the_low_target
.delete_thread (lwp
->arch_private
);
421 gdb_assert (lwp
->arch_private
== NULL
);
426 /* Add a process to the common process list, and set its private
429 static struct process_info
*
430 linux_add_process (int pid
, int attached
)
432 struct process_info
*proc
;
434 proc
= add_process (pid
, attached
);
435 proc
->priv
= XCNEW (struct process_info_private
);
437 if (the_low_target
.new_process
!= NULL
)
438 proc
->priv
->arch_private
= the_low_target
.new_process ();
443 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
445 /* Call the target arch_setup function on the current thread. */
448 linux_arch_setup (void)
450 the_low_target
.arch_setup ();
453 /* Call the target arch_setup function on THREAD. */
456 linux_arch_setup_thread (struct thread_info
*thread
)
458 struct thread_info
*saved_thread
;
460 saved_thread
= current_thread
;
461 current_thread
= thread
;
465 current_thread
= saved_thread
;
468 /* Handle a GNU/Linux extended wait response. If we see a clone,
469 fork, or vfork event, we need to add the new LWP to our list
470 (and return 0 so as not to report the trap to higher layers).
471 If we see an exec event, we will modify ORIG_EVENT_LWP to point
472 to a new LWP representing the new program. */
475 handle_extended_wait (struct lwp_info
**orig_event_lwp
, int wstat
)
477 struct lwp_info
*event_lwp
= *orig_event_lwp
;
478 int event
= linux_ptrace_get_extended_event (wstat
);
479 struct thread_info
*event_thr
= get_lwp_thread (event_lwp
);
480 struct lwp_info
*new_lwp
;
482 gdb_assert (event_lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
484 /* All extended events we currently use are mid-syscall. Only
485 PTRACE_EVENT_STOP is delivered more like a signal-stop, but
486 you have to be using PTRACE_SEIZE to get that. */
487 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
489 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
490 || (event
== PTRACE_EVENT_CLONE
))
493 unsigned long new_pid
;
496 /* Get the pid of the new lwp. */
497 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
500 /* If we haven't already seen the new PID stop, wait for it now. */
501 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
503 /* The new child has a pending SIGSTOP. We can't affect it until it
504 hits the SIGSTOP, but we're already attached. */
506 ret
= my_waitpid (new_pid
, &status
, __WALL
);
509 perror_with_name ("waiting for new child");
510 else if (ret
!= new_pid
)
511 warning ("wait returned unexpected PID %d", ret
);
512 else if (!WIFSTOPPED (status
))
513 warning ("wait returned unexpected status 0x%x", status
);
516 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
518 struct process_info
*parent_proc
;
519 struct process_info
*child_proc
;
520 struct lwp_info
*child_lwp
;
521 struct thread_info
*child_thr
;
522 struct target_desc
*tdesc
;
524 ptid
= ptid_build (new_pid
, new_pid
, 0);
528 debug_printf ("HEW: Got fork event from LWP %ld, "
530 ptid_get_lwp (ptid_of (event_thr
)),
531 ptid_get_pid (ptid
));
534 /* Add the new process to the tables and clone the breakpoint
535 lists of the parent. We need to do this even if the new process
536 will be detached, since we will need the process object and the
537 breakpoints to remove any breakpoints from memory when we
538 detach, and the client side will access registers. */
539 child_proc
= linux_add_process (new_pid
, 0);
540 gdb_assert (child_proc
!= NULL
);
541 child_lwp
= add_lwp (ptid
);
542 gdb_assert (child_lwp
!= NULL
);
543 child_lwp
->stopped
= 1;
544 child_lwp
->must_set_ptrace_flags
= 1;
545 child_lwp
->status_pending_p
= 0;
546 child_thr
= get_lwp_thread (child_lwp
);
547 child_thr
->last_resume_kind
= resume_stop
;
548 child_thr
->last_status
.kind
= TARGET_WAITKIND_STOPPED
;
550 /* If we're suspending all threads, leave this one suspended
551 too. If the fork/clone parent is stepping over a breakpoint,
552 all other threads have been suspended already. Leave the
553 child suspended too. */
554 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
555 || event_lwp
->bp_reinsert
!= 0)
558 debug_printf ("HEW: leaving child suspended\n");
559 child_lwp
->suspended
= 1;
562 parent_proc
= get_thread_process (event_thr
);
563 child_proc
->attached
= parent_proc
->attached
;
565 if (event_lwp
->bp_reinsert
!= 0
566 && can_software_single_step ()
567 && event
== PTRACE_EVENT_VFORK
)
569 /* If we leave single-step breakpoints there, child will
570 hit it, so uninsert single-step breakpoints from parent
571 (and child). Once vfork child is done, reinsert
572 them back to parent. */
573 uninsert_single_step_breakpoints (event_thr
);
576 clone_all_breakpoints (child_thr
, event_thr
);
578 tdesc
= allocate_target_description ();
579 copy_target_description (tdesc
, parent_proc
->tdesc
);
580 child_proc
->tdesc
= tdesc
;
582 /* Clone arch-specific process data. */
583 if (the_low_target
.new_fork
!= NULL
)
584 the_low_target
.new_fork (parent_proc
, child_proc
);
586 /* Save fork info in the parent thread. */
587 if (event
== PTRACE_EVENT_FORK
)
588 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
589 else if (event
== PTRACE_EVENT_VFORK
)
590 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
592 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
594 /* The status_pending field contains bits denoting the
595 extended event, so when the pending event is handled,
596 the handler will look at lwp->waitstatus. */
597 event_lwp
->status_pending_p
= 1;
598 event_lwp
->status_pending
= wstat
;
600 /* Link the threads until the parent event is passed on to
602 event_lwp
->fork_relative
= child_lwp
;
603 child_lwp
->fork_relative
= event_lwp
;
605 /* If the parent thread is doing step-over with single-step
606 breakpoints, the list of single-step breakpoints are cloned
607 from the parent's. Remove them from the child process.
608 In case of vfork, we'll reinsert them back once vforked
610 if (event_lwp
->bp_reinsert
!= 0
611 && can_software_single_step ())
613 /* The child process is forked and stopped, so it is safe
614 to access its memory without stopping all other threads
615 from other processes. */
616 delete_single_step_breakpoints (child_thr
);
618 gdb_assert (has_single_step_breakpoints (event_thr
));
619 gdb_assert (!has_single_step_breakpoints (child_thr
));
622 /* Report the event. */
627 debug_printf ("HEW: Got clone event "
628 "from LWP %ld, new child is LWP %ld\n",
629 lwpid_of (event_thr
), new_pid
);
631 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
632 new_lwp
= add_lwp (ptid
);
634 /* Either we're going to immediately resume the new thread
635 or leave it stopped. linux_resume_one_lwp is a nop if it
636 thinks the thread is currently running, so set this first
637 before calling linux_resume_one_lwp. */
638 new_lwp
->stopped
= 1;
640 /* If we're suspending all threads, leave this one suspended
641 too. If the fork/clone parent is stepping over a breakpoint,
642 all other threads have been suspended already. Leave the
643 child suspended too. */
644 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
645 || event_lwp
->bp_reinsert
!= 0)
646 new_lwp
->suspended
= 1;
648 /* Normally we will get the pending SIGSTOP. But in some cases
649 we might get another signal delivered to the group first.
650 If we do get another signal, be sure not to lose it. */
651 if (WSTOPSIG (status
) != SIGSTOP
)
653 new_lwp
->stop_expected
= 1;
654 new_lwp
->status_pending_p
= 1;
655 new_lwp
->status_pending
= status
;
657 else if (report_thread_events
)
659 new_lwp
->waitstatus
.kind
= TARGET_WAITKIND_THREAD_CREATED
;
660 new_lwp
->status_pending_p
= 1;
661 new_lwp
->status_pending
= status
;
664 thread_db_notice_clone (event_thr
, ptid
);
666 /* Don't report the event. */
669 else if (event
== PTRACE_EVENT_VFORK_DONE
)
671 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
673 if (event_lwp
->bp_reinsert
!= 0 && can_software_single_step ())
675 reinsert_single_step_breakpoints (event_thr
);
677 gdb_assert (has_single_step_breakpoints (event_thr
));
680 /* Report the event. */
683 else if (event
== PTRACE_EVENT_EXEC
&& report_exec_events
)
685 struct process_info
*proc
;
686 std::vector
<int> syscalls_to_catch
;
692 debug_printf ("HEW: Got exec event from LWP %ld\n",
693 lwpid_of (event_thr
));
696 /* Get the event ptid. */
697 event_ptid
= ptid_of (event_thr
);
698 event_pid
= ptid_get_pid (event_ptid
);
700 /* Save the syscall list from the execing process. */
701 proc
= get_thread_process (event_thr
);
702 syscalls_to_catch
= std::move (proc
->syscalls_to_catch
);
704 /* Delete the execing process and all its threads. */
706 current_thread
= NULL
;
708 /* Create a new process/lwp/thread. */
709 proc
= linux_add_process (event_pid
, 0);
710 event_lwp
= add_lwp (event_ptid
);
711 event_thr
= get_lwp_thread (event_lwp
);
712 gdb_assert (current_thread
== event_thr
);
713 linux_arch_setup_thread (event_thr
);
715 /* Set the event status. */
716 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
717 event_lwp
->waitstatus
.value
.execd_pathname
718 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
720 /* Mark the exec status as pending. */
721 event_lwp
->stopped
= 1;
722 event_lwp
->status_pending_p
= 1;
723 event_lwp
->status_pending
= wstat
;
724 event_thr
->last_resume_kind
= resume_continue
;
725 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
727 /* Update syscall state in the new lwp, effectively mid-syscall too. */
728 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
730 /* Restore the list to catch. Don't rely on the client, which is free
731 to avoid sending a new list when the architecture doesn't change.
732 Also, for ANY_SYSCALL, the architecture doesn't really matter. */
733 proc
->syscalls_to_catch
= std::move (syscalls_to_catch
);
735 /* Report the event. */
736 *orig_event_lwp
= event_lwp
;
740 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
743 /* Return the PC as read from the regcache of LWP, without any
747 get_pc (struct lwp_info
*lwp
)
749 struct thread_info
*saved_thread
;
750 struct regcache
*regcache
;
753 if (the_low_target
.get_pc
== NULL
)
756 saved_thread
= current_thread
;
757 current_thread
= get_lwp_thread (lwp
);
759 regcache
= get_thread_regcache (current_thread
, 1);
760 pc
= (*the_low_target
.get_pc
) (regcache
);
763 debug_printf ("pc is 0x%lx\n", (long) pc
);
765 current_thread
= saved_thread
;
769 /* This function should only be called if LWP got a SYSCALL_SIGTRAP.
770 Fill *SYSNO with the syscall nr trapped. */
773 get_syscall_trapinfo (struct lwp_info
*lwp
, int *sysno
)
775 struct thread_info
*saved_thread
;
776 struct regcache
*regcache
;
778 if (the_low_target
.get_syscall_trapinfo
== NULL
)
780 /* If we cannot get the syscall trapinfo, report an unknown
781 system call number. */
782 *sysno
= UNKNOWN_SYSCALL
;
786 saved_thread
= current_thread
;
787 current_thread
= get_lwp_thread (lwp
);
789 regcache
= get_thread_regcache (current_thread
, 1);
790 (*the_low_target
.get_syscall_trapinfo
) (regcache
, sysno
);
793 debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno
);
795 current_thread
= saved_thread
;
798 static int check_stopped_by_watchpoint (struct lwp_info
*child
);
800 /* Called when the LWP stopped for a signal/trap. If it stopped for a
801 trap check what caused it (breakpoint, watchpoint, trace, etc.),
802 and save the result in the LWP's stop_reason field. If it stopped
803 for a breakpoint, decrement the PC if necessary on the lwp's
804 architecture. Returns true if we now have the LWP's stop PC. */
807 save_stop_reason (struct lwp_info
*lwp
)
810 CORE_ADDR sw_breakpoint_pc
;
811 struct thread_info
*saved_thread
;
812 #if USE_SIGTRAP_SIGINFO
816 if (the_low_target
.get_pc
== NULL
)
820 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
822 /* breakpoint_at reads from the current thread. */
823 saved_thread
= current_thread
;
824 current_thread
= get_lwp_thread (lwp
);
826 #if USE_SIGTRAP_SIGINFO
827 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
828 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
830 if (siginfo
.si_signo
== SIGTRAP
)
832 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
)
833 && GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
835 /* The si_code is ambiguous on this arch -- check debug
837 if (!check_stopped_by_watchpoint (lwp
))
838 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
840 else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
842 /* If we determine the LWP stopped for a SW breakpoint,
843 trust it. Particularly don't check watchpoint
844 registers, because at least on s390, we'd find
845 stopped-by-watchpoint as long as there's a watchpoint
847 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
849 else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
851 /* This can indicate either a hardware breakpoint or
852 hardware watchpoint. Check debug registers. */
853 if (!check_stopped_by_watchpoint (lwp
))
854 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
856 else if (siginfo
.si_code
== TRAP_TRACE
)
858 /* We may have single stepped an instruction that
859 triggered a watchpoint. In that case, on some
860 architectures (such as x86), instead of TRAP_HWBKPT,
861 si_code indicates TRAP_TRACE, and we need to check
862 the debug registers separately. */
863 if (!check_stopped_by_watchpoint (lwp
))
864 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
869 /* We may have just stepped a breakpoint instruction. E.g., in
870 non-stop mode, GDB first tells the thread A to step a range, and
871 then the user inserts a breakpoint inside the range. In that
872 case we need to report the breakpoint PC. */
873 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
874 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
875 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
877 if (hardware_breakpoint_inserted_here (pc
))
878 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
880 if (lwp
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
)
881 check_stopped_by_watchpoint (lwp
);
884 if (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
888 struct thread_info
*thr
= get_lwp_thread (lwp
);
890 debug_printf ("CSBB: %s stopped by software breakpoint\n",
891 target_pid_to_str (ptid_of (thr
)));
894 /* Back up the PC if necessary. */
895 if (pc
!= sw_breakpoint_pc
)
897 struct regcache
*regcache
898 = get_thread_regcache (current_thread
, 1);
899 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
902 /* Update this so we record the correct stop PC below. */
903 pc
= sw_breakpoint_pc
;
905 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
)
909 struct thread_info
*thr
= get_lwp_thread (lwp
);
911 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
912 target_pid_to_str (ptid_of (thr
)));
915 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
919 struct thread_info
*thr
= get_lwp_thread (lwp
);
921 debug_printf ("CSBB: %s stopped by hardware watchpoint\n",
922 target_pid_to_str (ptid_of (thr
)));
925 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
)
929 struct thread_info
*thr
= get_lwp_thread (lwp
);
931 debug_printf ("CSBB: %s stopped by trace\n",
932 target_pid_to_str (ptid_of (thr
)));
937 current_thread
= saved_thread
;
941 static struct lwp_info
*
942 add_lwp (ptid_t ptid
)
944 struct lwp_info
*lwp
;
946 lwp
= XCNEW (struct lwp_info
);
948 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
950 if (the_low_target
.new_thread
!= NULL
)
951 the_low_target
.new_thread (lwp
);
953 lwp
->thread
= add_thread (ptid
, lwp
);
958 /* Callback to be used when calling fork_inferior, responsible for
959 actually initiating the tracing of the inferior. */
964 if (ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0,
965 (PTRACE_TYPE_ARG4
) 0) < 0)
966 trace_start_error_with_name ("ptrace");
968 if (setpgid (0, 0) < 0)
969 trace_start_error_with_name ("setpgid");
971 /* If GDBserver is connected to gdb via stdio, redirect the inferior's
972 stdout to stderr so that inferior i/o doesn't corrupt the connection.
973 Also, redirect stdin to /dev/null. */
974 if (remote_connection_is_stdio ())
977 trace_start_error_with_name ("close");
978 if (open ("/dev/null", O_RDONLY
) < 0)
979 trace_start_error_with_name ("open");
981 trace_start_error_with_name ("dup2");
982 if (write (2, "stdin/stdout redirected\n",
983 sizeof ("stdin/stdout redirected\n") - 1) < 0)
985 /* Errors ignored. */;
990 /* Start an inferior process and returns its pid.
991 PROGRAM is the name of the program to be started, and PROGRAM_ARGS
992 are its arguments. */
995 linux_create_inferior (const char *program
,
996 const std::vector
<char *> &program_args
)
998 struct lwp_info
*new_lwp
;
1003 maybe_disable_address_space_randomization restore_personality
1004 (disable_randomization
);
1005 std::string str_program_args
= stringify_argv (program_args
);
1007 pid
= fork_inferior (program
,
1008 str_program_args
.c_str (),
1009 get_environ ()->envp (), linux_ptrace_fun
,
1010 NULL
, NULL
, NULL
, NULL
);
1013 linux_add_process (pid
, 0);
1015 ptid
= ptid_build (pid
, pid
, 0);
1016 new_lwp
= add_lwp (ptid
);
1017 new_lwp
->must_set_ptrace_flags
= 1;
1019 post_fork_inferior (pid
, program
);
1024 /* Implement the post_create_inferior target_ops method. */
1027 linux_post_create_inferior (void)
1029 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
1031 linux_arch_setup ();
1033 if (lwp
->must_set_ptrace_flags
)
1035 struct process_info
*proc
= current_process ();
1036 int options
= linux_low_ptrace_options (proc
->attached
);
1038 linux_enable_event_reporting (lwpid_of (current_thread
), options
);
1039 lwp
->must_set_ptrace_flags
= 0;
1043 /* Attach to an inferior process. Returns 0 on success, ERRNO on
1047 linux_attach_lwp (ptid_t ptid
)
1049 struct lwp_info
*new_lwp
;
1050 int lwpid
= ptid_get_lwp (ptid
);
1052 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
1056 new_lwp
= add_lwp (ptid
);
1058 /* We need to wait for SIGSTOP before being able to make the next
1059 ptrace call on this LWP. */
1060 new_lwp
->must_set_ptrace_flags
= 1;
1062 if (linux_proc_pid_is_stopped (lwpid
))
1065 debug_printf ("Attached to a stopped process\n");
1067 /* The process is definitely stopped. It is in a job control
1068 stop, unless the kernel predates the TASK_STOPPED /
1069 TASK_TRACED distinction, in which case it might be in a
1070 ptrace stop. Make sure it is in a ptrace stop; from there we
1071 can kill it, signal it, et cetera.
1073 First make sure there is a pending SIGSTOP. Since we are
1074 already attached, the process can not transition from stopped
1075 to running without a PTRACE_CONT; so we know this signal will
1076 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1077 probably already in the queue (unless this kernel is old
1078 enough to use TASK_STOPPED for ptrace stops); but since
1079 SIGSTOP is not an RT signal, it can only be queued once. */
1080 kill_lwp (lwpid
, SIGSTOP
);
1082 /* Finally, resume the stopped process. This will deliver the
1083 SIGSTOP (or a higher priority signal, just like normal
1084 PTRACE_ATTACH), which we'll catch later on. */
1085 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1088 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
1089 brings it to a halt.
1091 There are several cases to consider here:
1093 1) gdbserver has already attached to the process and is being notified
1094 of a new thread that is being created.
1095 In this case we should ignore that SIGSTOP and resume the
1096 process. This is handled below by setting stop_expected = 1,
1097 and the fact that add_thread sets last_resume_kind ==
1100 2) This is the first thread (the process thread), and we're attaching
1101 to it via attach_inferior.
1102 In this case we want the process thread to stop.
1103 This is handled by having linux_attach set last_resume_kind ==
1104 resume_stop after we return.
1106 If the pid we are attaching to is also the tgid, we attach to and
1107 stop all the existing threads. Otherwise, we attach to pid and
1108 ignore any other threads in the same group as this pid.
1110 3) GDB is connecting to gdbserver and is requesting an enumeration of all
1112 In this case we want the thread to stop.
1113 FIXME: This case is currently not properly handled.
1114 We should wait for the SIGSTOP but don't. Things work apparently
1115 because enough time passes between when we ptrace (ATTACH) and when
1116 gdb makes the next ptrace call on the thread.
1118 On the other hand, if we are currently trying to stop all threads, we
1119 should treat the new thread as if we had sent it a SIGSTOP. This works
1120 because we are guaranteed that the add_lwp call above added us to the
1121 end of the list, and so the new thread has not yet reached
1122 wait_for_sigstop (but will). */
1123 new_lwp
->stop_expected
= 1;
1128 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
1129 already attached. Returns true if a new LWP is found, false
1133 attach_proc_task_lwp_callback (ptid_t ptid
)
1135 /* Is this a new thread? */
1136 if (find_thread_ptid (ptid
) == NULL
)
1138 int lwpid
= ptid_get_lwp (ptid
);
1142 debug_printf ("Found new lwp %d\n", lwpid
);
1144 err
= linux_attach_lwp (ptid
);
1146 /* Be quiet if we simply raced with the thread exiting. EPERM
1147 is returned if the thread's task still exists, and is marked
1148 as exited or zombie, as well as other conditions, so in that
1149 case, confirm the status in /proc/PID/status. */
1151 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1155 debug_printf ("Cannot attach to lwp %d: "
1156 "thread is gone (%d: %s)\n",
1157 lwpid
, err
, strerror (err
));
1162 warning (_("Cannot attach to lwp %d: %s"),
1164 linux_ptrace_attach_fail_reason_string (ptid
, err
));
1172 static void async_file_mark (void);
1174 /* Attach to PID. If PID is the tgid, attach to it and all
1178 linux_attach (unsigned long pid
)
1180 struct process_info
*proc
;
1181 struct thread_info
*initial_thread
;
1182 ptid_t ptid
= ptid_build (pid
, pid
, 0);
1185 /* Attach to PID. We will check for other threads
1187 err
= linux_attach_lwp (ptid
);
1189 error ("Cannot attach to process %ld: %s",
1190 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
1192 proc
= linux_add_process (pid
, 1);
1194 /* Don't ignore the initial SIGSTOP if we just attached to this
1195 process. It will be collected by wait shortly. */
1196 initial_thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
1197 initial_thread
->last_resume_kind
= resume_stop
;
1199 /* We must attach to every LWP. If /proc is mounted, use that to
1200 find them now. On the one hand, the inferior may be using raw
1201 clone instead of using pthreads. On the other hand, even if it
1202 is using pthreads, GDB may not be connected yet (thread_db needs
1203 to do symbol lookups, through qSymbol). Also, thread_db walks
1204 structures in the inferior's address space to find the list of
1205 threads/LWPs, and those structures may well be corrupted. Note
1206 that once thread_db is loaded, we'll still use it to list threads
1207 and associate pthread info with each LWP. */
1208 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1210 /* GDB will shortly read the xml target description for this
1211 process, to figure out the process' architecture. But the target
1212 description is only filled in when the first process/thread in
1213 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1214 that now, otherwise, if GDB is fast enough, it could read the
1215 target description _before_ that initial stop. */
1218 struct lwp_info
*lwp
;
1220 ptid_t pid_ptid
= pid_to_ptid (pid
);
1222 lwpid
= linux_wait_for_event_filtered (pid_ptid
, pid_ptid
,
1224 gdb_assert (lwpid
> 0);
1226 lwp
= find_lwp_pid (pid_to_ptid (lwpid
));
1228 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGSTOP
)
1230 lwp
->status_pending_p
= 1;
1231 lwp
->status_pending
= wstat
;
1234 initial_thread
->last_resume_kind
= resume_continue
;
1238 gdb_assert (proc
->tdesc
!= NULL
);
1245 last_thread_of_process_p (int pid
)
1247 bool seen_one
= false;
1249 thread_info
*thread
= find_thread (pid
, [&] (thread_info
*thread
)
1253 /* This is the first thread of this process we see. */
1259 /* This is the second thread of this process we see. */
1264 return thread
== NULL
;
1270 linux_kill_one_lwp (struct lwp_info
*lwp
)
1272 struct thread_info
*thr
= get_lwp_thread (lwp
);
1273 int pid
= lwpid_of (thr
);
1275 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1276 there is no signal context, and ptrace(PTRACE_KILL) (or
1277 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1278 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1279 alternative is to kill with SIGKILL. We only need one SIGKILL
1280 per process, not one for each thread. But since we still support
1281 support debugging programs using raw clone without CLONE_THREAD,
1282 we send one for each thread. For years, we used PTRACE_KILL
1283 only, so we're being a bit paranoid about some old kernels where
1284 PTRACE_KILL might work better (dubious if there are any such, but
1285 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1286 second, and so we're fine everywhere. */
1289 kill_lwp (pid
, SIGKILL
);
1292 int save_errno
= errno
;
1294 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1295 target_pid_to_str (ptid_of (thr
)),
1296 save_errno
? strerror (save_errno
) : "OK");
1300 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1303 int save_errno
= errno
;
1305 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1306 target_pid_to_str (ptid_of (thr
)),
1307 save_errno
? strerror (save_errno
) : "OK");
1311 /* Kill LWP and wait for it to die. */
1314 kill_wait_lwp (struct lwp_info
*lwp
)
1316 struct thread_info
*thr
= get_lwp_thread (lwp
);
1317 int pid
= ptid_get_pid (ptid_of (thr
));
1318 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1323 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1327 linux_kill_one_lwp (lwp
);
1329 /* Make sure it died. Notes:
1331 - The loop is most likely unnecessary.
1333 - We don't use linux_wait_for_event as that could delete lwps
1334 while we're iterating over them. We're not interested in
1335 any pending status at this point, only in making sure all
1336 wait status on the kernel side are collected until the
1339 - We don't use __WALL here as the __WALL emulation relies on
1340 SIGCHLD, and killing a stopped process doesn't generate
1341 one, nor an exit status.
1343 res
= my_waitpid (lwpid
, &wstat
, 0);
1344 if (res
== -1 && errno
== ECHILD
)
1345 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1346 } while (res
> 0 && WIFSTOPPED (wstat
));
1348 /* Even if it was stopped, the child may have already disappeared.
1349 E.g., if it was killed by SIGKILL. */
1350 if (res
< 0 && errno
!= ECHILD
)
1351 perror_with_name ("kill_wait_lwp");
1354 /* Callback for `for_each_thread'. Kills an lwp of a given process,
1355 except the leader. */
1358 kill_one_lwp_callback (thread_info
*thread
, int pid
)
1360 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1362 /* We avoid killing the first thread here, because of a Linux kernel (at
1363 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1364 the children get a chance to be reaped, it will remain a zombie
1367 if (lwpid_of (thread
) == pid
)
1370 debug_printf ("lkop: is last of process %s\n",
1371 target_pid_to_str (thread
->id
));
1375 kill_wait_lwp (lwp
);
1379 linux_kill (int pid
)
1381 struct process_info
*process
;
1382 struct lwp_info
*lwp
;
1384 process
= find_process_pid (pid
);
1385 if (process
== NULL
)
1388 /* If we're killing a running inferior, make sure it is stopped
1389 first, as PTRACE_KILL will not work otherwise. */
1390 stop_all_lwps (0, NULL
);
1392 for_each_thread (pid
, [&] (thread_info
*thread
)
1394 kill_one_lwp_callback (thread
, pid
);
1397 /* See the comment in linux_kill_one_lwp. We did not kill the first
1398 thread in the list, so do so now. */
1399 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1404 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1408 kill_wait_lwp (lwp
);
1410 the_target
->mourn (process
);
1412 /* Since we presently can only stop all lwps of all processes, we
1413 need to unstop lwps of other processes. */
1414 unstop_all_lwps (0, NULL
);
1418 /* Get pending signal of THREAD, for detaching purposes. This is the
1419 signal the thread last stopped for, which we need to deliver to the
1420 thread when detaching, otherwise, it'd be suppressed/lost. */
1423 get_detach_signal (struct thread_info
*thread
)
1425 enum gdb_signal signo
= GDB_SIGNAL_0
;
1427 struct lwp_info
*lp
= get_thread_lwp (thread
);
1429 if (lp
->status_pending_p
)
1430 status
= lp
->status_pending
;
1433 /* If the thread had been suspended by gdbserver, and it stopped
1434 cleanly, then it'll have stopped with SIGSTOP. But we don't
1435 want to deliver that SIGSTOP. */
1436 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1437 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1440 /* Otherwise, we may need to deliver the signal we
1442 status
= lp
->last_status
;
1445 if (!WIFSTOPPED (status
))
1448 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1449 target_pid_to_str (ptid_of (thread
)));
1453 /* Extended wait statuses aren't real SIGTRAPs. */
1454 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1457 debug_printf ("GPS: lwp %s had stopped with extended "
1458 "status: no pending signal\n",
1459 target_pid_to_str (ptid_of (thread
)));
1463 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1465 if (program_signals_p
&& !program_signals
[signo
])
1468 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1469 target_pid_to_str (ptid_of (thread
)),
1470 gdb_signal_to_string (signo
));
1473 else if (!program_signals_p
1474 /* If we have no way to know which signals GDB does not
1475 want to have passed to the program, assume
1476 SIGTRAP/SIGINT, which is GDB's default. */
1477 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1480 debug_printf ("GPS: lwp %s had signal %s, "
1481 "but we don't know if we should pass it. "
1482 "Default to not.\n",
1483 target_pid_to_str (ptid_of (thread
)),
1484 gdb_signal_to_string (signo
));
1490 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1491 target_pid_to_str (ptid_of (thread
)),
1492 gdb_signal_to_string (signo
));
1494 return WSTOPSIG (status
);
1498 /* Detach from LWP. */
1501 linux_detach_one_lwp (struct lwp_info
*lwp
)
1503 struct thread_info
*thread
= get_lwp_thread (lwp
);
1507 /* If there is a pending SIGSTOP, get rid of it. */
1508 if (lwp
->stop_expected
)
1511 debug_printf ("Sending SIGCONT to %s\n",
1512 target_pid_to_str (ptid_of (thread
)));
1514 kill_lwp (lwpid_of (thread
), SIGCONT
);
1515 lwp
->stop_expected
= 0;
1518 /* Pass on any pending signal for this thread. */
1519 sig
= get_detach_signal (thread
);
1521 /* Preparing to resume may try to write registers, and fail if the
1522 lwp is zombie. If that happens, ignore the error. We'll handle
1523 it below, when detach fails with ESRCH. */
1526 /* Flush any pending changes to the process's registers. */
1527 regcache_invalidate_thread (thread
);
1529 /* Finally, let it resume. */
1530 if (the_low_target
.prepare_to_resume
!= NULL
)
1531 the_low_target
.prepare_to_resume (lwp
);
1533 CATCH (ex
, RETURN_MASK_ERROR
)
1535 if (!check_ptrace_stopped_lwp_gone (lwp
))
1536 throw_exception (ex
);
1540 lwpid
= lwpid_of (thread
);
1541 if (ptrace (PTRACE_DETACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0,
1542 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1544 int save_errno
= errno
;
1546 /* We know the thread exists, so ESRCH must mean the lwp is
1547 zombie. This can happen if one of the already-detached
1548 threads exits the whole thread group. In that case we're
1549 still attached, and must reap the lwp. */
1550 if (save_errno
== ESRCH
)
1554 ret
= my_waitpid (lwpid
, &status
, __WALL
);
1557 warning (_("Couldn't reap LWP %d while detaching: %s"),
1558 lwpid
, strerror (errno
));
1560 else if (!WIFEXITED (status
) && !WIFSIGNALED (status
))
1562 warning (_("Reaping LWP %d while detaching "
1563 "returned unexpected status 0x%x"),
1569 error (_("Can't detach %s: %s"),
1570 target_pid_to_str (ptid_of (thread
)),
1571 strerror (save_errno
));
1574 else if (debug_threads
)
1576 debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n",
1577 target_pid_to_str (ptid_of (thread
)),
1584 /* Callback for for_each_thread. Detaches from non-leader threads of a
1588 linux_detach_lwp_callback (thread_info
*thread
)
1590 /* We don't actually detach from the thread group leader just yet.
1591 If the thread group exits, we must reap the zombie clone lwps
1592 before we're able to reap the leader. */
1593 if (thread
->id
.pid () == thread
->id
.lwp ())
1596 lwp_info
*lwp
= get_thread_lwp (thread
);
1597 linux_detach_one_lwp (lwp
);
1601 linux_detach (int pid
)
1603 struct process_info
*process
;
1604 struct lwp_info
*main_lwp
;
1606 process
= find_process_pid (pid
);
1607 if (process
== NULL
)
1610 /* As there's a step over already in progress, let it finish first,
1611 otherwise nesting a stabilize_threads operation on top gets real
1613 complete_ongoing_step_over ();
1615 /* Stop all threads before detaching. First, ptrace requires that
1616 the thread is stopped to sucessfully detach. Second, thread_db
1617 may need to uninstall thread event breakpoints from memory, which
1618 only works with a stopped process anyway. */
1619 stop_all_lwps (0, NULL
);
1621 #ifdef USE_THREAD_DB
1622 thread_db_detach (process
);
1625 /* Stabilize threads (move out of jump pads). */
1626 stabilize_threads ();
1628 /* Detach from the clone lwps first. If the thread group exits just
1629 while we're detaching, we must reap the clone lwps before we're
1630 able to reap the leader. */
1631 for_each_thread (pid
, linux_detach_lwp_callback
);
1633 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1634 linux_detach_one_lwp (main_lwp
);
1636 the_target
->mourn (process
);
1638 /* Since we presently can only stop all lwps of all processes, we
1639 need to unstop lwps of other processes. */
1640 unstop_all_lwps (0, NULL
);
1644 /* Remove all LWPs that belong to process PROC from the lwp list. */
1647 linux_mourn (struct process_info
*process
)
1649 struct process_info_private
*priv
;
1651 #ifdef USE_THREAD_DB
1652 thread_db_mourn (process
);
1655 for_each_thread (process
->pid
, [] (thread_info
*thread
)
1657 delete_lwp (get_thread_lwp (thread
));
1660 /* Freeing all private data. */
1661 priv
= process
->priv
;
1662 if (the_low_target
.delete_process
!= NULL
)
1663 the_low_target
.delete_process (priv
->arch_private
);
1665 gdb_assert (priv
->arch_private
== NULL
);
1667 process
->priv
= NULL
;
1669 remove_process (process
);
1673 linux_join (int pid
)
1678 ret
= my_waitpid (pid
, &status
, 0);
1679 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1681 } while (ret
!= -1 || errno
!= ECHILD
);
1684 /* Return nonzero if the given thread is still alive. */
1686 linux_thread_alive (ptid_t ptid
)
1688 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1690 /* We assume we always know if a thread exits. If a whole process
1691 exited but we still haven't been able to report it to GDB, we'll
1692 hold on to the last lwp of the dead process. */
1694 return !lwp_is_marked_dead (lwp
);
1699 /* Return 1 if this lwp still has an interesting status pending. If
1700 not (e.g., it had stopped for a breakpoint that is gone), return
1704 thread_still_has_status_pending_p (struct thread_info
*thread
)
1706 struct lwp_info
*lp
= get_thread_lwp (thread
);
1708 if (!lp
->status_pending_p
)
1711 if (thread
->last_resume_kind
!= resume_stop
1712 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1713 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1715 struct thread_info
*saved_thread
;
1719 gdb_assert (lp
->last_status
!= 0);
1723 saved_thread
= current_thread
;
1724 current_thread
= thread
;
1726 if (pc
!= lp
->stop_pc
)
1729 debug_printf ("PC of %ld changed\n",
1734 #if !USE_SIGTRAP_SIGINFO
1735 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1736 && !(*the_low_target
.breakpoint_at
) (pc
))
1739 debug_printf ("previous SW breakpoint of %ld gone\n",
1743 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1744 && !hardware_breakpoint_inserted_here (pc
))
1747 debug_printf ("previous HW breakpoint of %ld gone\n",
1753 current_thread
= saved_thread
;
1758 debug_printf ("discarding pending breakpoint status\n");
1759 lp
->status_pending_p
= 0;
1767 /* Returns true if LWP is resumed from the client's perspective. */
1770 lwp_resumed (struct lwp_info
*lwp
)
1772 struct thread_info
*thread
= get_lwp_thread (lwp
);
1774 if (thread
->last_resume_kind
!= resume_stop
)
1777 /* Did gdb send us a `vCont;t', but we haven't reported the
1778 corresponding stop to gdb yet? If so, the thread is still
1779 resumed/running from gdb's perspective. */
1780 if (thread
->last_resume_kind
== resume_stop
1781 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1787 /* Return true if this lwp has an interesting status pending. */
1789 status_pending_p_callback (thread_info
*thread
, ptid_t ptid
)
1791 struct lwp_info
*lp
= get_thread_lwp (thread
);
1793 /* Check if we're only interested in events from a specific process
1794 or a specific LWP. */
1795 if (!thread
->id
.matches (ptid
))
1798 if (!lwp_resumed (lp
))
1801 if (lp
->status_pending_p
1802 && !thread_still_has_status_pending_p (thread
))
1804 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1808 return lp
->status_pending_p
;
1812 same_lwp (thread_info
*thread
, void *data
)
1814 ptid_t ptid
= *(ptid_t
*) data
;
1817 if (ptid_get_lwp (ptid
) != 0)
1818 lwp
= ptid_get_lwp (ptid
);
1820 lwp
= ptid_get_pid (ptid
);
1822 if (thread
->id
.lwp () == lwp
)
1829 find_lwp_pid (ptid_t ptid
)
1831 thread_info
*thread
= find_inferior (&all_threads
, same_lwp
, &ptid
);
1836 return get_thread_lwp (thread
);
1839 /* Return the number of known LWPs in the tgid given by PID. */
1846 for_each_thread (pid
, [&] (thread_info
*thread
)
1854 /* See nat/linux-nat.h. */
1857 iterate_over_lwps (ptid_t filter
,
1858 iterate_over_lwps_ftype callback
,
1861 thread_info
*thread
= find_thread (filter
, [&] (thread_info
*thread
)
1863 lwp_info
*lwp
= get_thread_lwp (thread
);
1865 return callback (lwp
, data
);
1871 return get_thread_lwp (thread
);
1874 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1875 their exits until all other threads in the group have exited. */
1878 check_zombie_leaders (void)
1880 for_each_process ([] (process_info
*proc
) {
1881 pid_t leader_pid
= pid_of (proc
);
1882 struct lwp_info
*leader_lp
;
1884 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1887 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1888 "num_lwps=%d, zombie=%d\n",
1889 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1890 linux_proc_pid_is_zombie (leader_pid
));
1892 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1893 /* Check if there are other threads in the group, as we may
1894 have raced with the inferior simply exiting. */
1895 && !last_thread_of_process_p (leader_pid
)
1896 && linux_proc_pid_is_zombie (leader_pid
))
1898 /* A leader zombie can mean one of two things:
1900 - It exited, and there's an exit status pending
1901 available, or only the leader exited (not the whole
1902 program). In the latter case, we can't waitpid the
1903 leader's exit status until all other threads are gone.
1905 - There are 3 or more threads in the group, and a thread
1906 other than the leader exec'd. On an exec, the Linux
1907 kernel destroys all other threads (except the execing
1908 one) in the thread group, and resets the execing thread's
1909 tid to the tgid. No exit notification is sent for the
1910 execing thread -- from the ptracer's perspective, it
1911 appears as though the execing thread just vanishes.
1912 Until we reap all other threads except the leader and the
1913 execing thread, the leader will be zombie, and the
1914 execing thread will be in `D (disc sleep)'. As soon as
1915 all other threads are reaped, the execing thread changes
1916 it's tid to the tgid, and the previous (zombie) leader
1917 vanishes, giving place to the "new" leader. We could try
1918 distinguishing the exit and exec cases, by waiting once
1919 more, and seeing if something comes out, but it doesn't
1920 sound useful. The previous leader _does_ go away, and
1921 we'll re-add the new one once we see the exec event
1922 (which is just the same as what would happen if the
1923 previous leader did exit voluntarily before some other
1927 debug_printf ("CZL: Thread group leader %d zombie "
1928 "(it exited, or another thread execd).\n",
1931 delete_lwp (leader_lp
);
1936 /* Callback for `find_inferior'. Returns the first LWP that is not
1937 stopped. ARG is a PTID filter. */
1940 not_stopped_callback (thread_info
*thread
, void *arg
)
1942 struct lwp_info
*lwp
;
1943 ptid_t filter
= *(ptid_t
*) arg
;
1945 if (!ptid_match (ptid_of (thread
), filter
))
1948 lwp
= get_thread_lwp (thread
);
1955 /* Increment LWP's suspend count. */
1958 lwp_suspended_inc (struct lwp_info
*lwp
)
1962 if (debug_threads
&& lwp
->suspended
> 4)
1964 struct thread_info
*thread
= get_lwp_thread (lwp
);
1966 debug_printf ("LWP %ld has a suspiciously high suspend count,"
1967 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
1971 /* Decrement LWP's suspend count. */
1974 lwp_suspended_decr (struct lwp_info
*lwp
)
1978 if (lwp
->suspended
< 0)
1980 struct thread_info
*thread
= get_lwp_thread (lwp
);
1982 internal_error (__FILE__
, __LINE__
,
1983 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
1988 /* This function should only be called if the LWP got a SIGTRAP.
1990 Handle any tracepoint steps or hits. Return true if a tracepoint
1991 event was handled, 0 otherwise. */
1994 handle_tracepoints (struct lwp_info
*lwp
)
1996 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1997 int tpoint_related_event
= 0;
1999 gdb_assert (lwp
->suspended
== 0);
2001 /* If this tracepoint hit causes a tracing stop, we'll immediately
2002 uninsert tracepoints. To do this, we temporarily pause all
2003 threads, unpatch away, and then unpause threads. We need to make
2004 sure the unpausing doesn't resume LWP too. */
2005 lwp_suspended_inc (lwp
);
2007 /* And we need to be sure that any all-threads-stopping doesn't try
2008 to move threads out of the jump pads, as it could deadlock the
2009 inferior (LWP could be in the jump pad, maybe even holding the
2012 /* Do any necessary step collect actions. */
2013 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2015 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2017 /* See if we just hit a tracepoint and do its main collect
2019 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2021 lwp_suspended_decr (lwp
);
2023 gdb_assert (lwp
->suspended
== 0);
2024 gdb_assert (!stabilizing_threads
2025 || (lwp
->collecting_fast_tracepoint
2026 != fast_tpoint_collect_result::not_collecting
));
2028 if (tpoint_related_event
)
2031 debug_printf ("got a tracepoint event\n");
2038 /* Convenience wrapper. Returns information about LWP's fast tracepoint
2039 collection status. */
2041 static fast_tpoint_collect_result
2042 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2043 struct fast_tpoint_collect_status
*status
)
2045 CORE_ADDR thread_area
;
2046 struct thread_info
*thread
= get_lwp_thread (lwp
);
2048 if (the_low_target
.get_thread_area
== NULL
)
2049 return fast_tpoint_collect_result::not_collecting
;
2051 /* Get the thread area address. This is used to recognize which
2052 thread is which when tracing with the in-process agent library.
2053 We don't read anything from the address, and treat it as opaque;
2054 it's the address itself that we assume is unique per-thread. */
2055 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2056 return fast_tpoint_collect_result::not_collecting
;
2058 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2061 /* The reason we resume in the caller, is because we want to be able
2062 to pass lwp->status_pending as WSTAT, and we need to clear
2063 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2064 refuses to resume. */
2067 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2069 struct thread_info
*saved_thread
;
2071 saved_thread
= current_thread
;
2072 current_thread
= get_lwp_thread (lwp
);
2075 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2076 && supports_fast_tracepoints ()
2077 && agent_loaded_p ())
2079 struct fast_tpoint_collect_status status
;
2082 debug_printf ("Checking whether LWP %ld needs to move out of the "
2084 lwpid_of (current_thread
));
2086 fast_tpoint_collect_result r
2087 = linux_fast_tracepoint_collecting (lwp
, &status
);
2090 || (WSTOPSIG (*wstat
) != SIGILL
2091 && WSTOPSIG (*wstat
) != SIGFPE
2092 && WSTOPSIG (*wstat
) != SIGSEGV
2093 && WSTOPSIG (*wstat
) != SIGBUS
))
2095 lwp
->collecting_fast_tracepoint
= r
;
2097 if (r
!= fast_tpoint_collect_result::not_collecting
)
2099 if (r
== fast_tpoint_collect_result::before_insn
2100 && lwp
->exit_jump_pad_bkpt
== NULL
)
2102 /* Haven't executed the original instruction yet.
2103 Set breakpoint there, and wait till it's hit,
2104 then single-step until exiting the jump pad. */
2105 lwp
->exit_jump_pad_bkpt
2106 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2110 debug_printf ("Checking whether LWP %ld needs to move out of "
2111 "the jump pad...it does\n",
2112 lwpid_of (current_thread
));
2113 current_thread
= saved_thread
;
2120 /* If we get a synchronous signal while collecting, *and*
2121 while executing the (relocated) original instruction,
2122 reset the PC to point at the tpoint address, before
2123 reporting to GDB. Otherwise, it's an IPA lib bug: just
2124 report the signal to GDB, and pray for the best. */
2126 lwp
->collecting_fast_tracepoint
2127 = fast_tpoint_collect_result::not_collecting
;
2129 if (r
!= fast_tpoint_collect_result::not_collecting
2130 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2131 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2134 struct regcache
*regcache
;
2136 /* The si_addr on a few signals references the address
2137 of the faulting instruction. Adjust that as
2139 if ((WSTOPSIG (*wstat
) == SIGILL
2140 || WSTOPSIG (*wstat
) == SIGFPE
2141 || WSTOPSIG (*wstat
) == SIGBUS
2142 || WSTOPSIG (*wstat
) == SIGSEGV
)
2143 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2144 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2145 /* Final check just to make sure we don't clobber
2146 the siginfo of non-kernel-sent signals. */
2147 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2149 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2150 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2151 (PTRACE_TYPE_ARG3
) 0, &info
);
2154 regcache
= get_thread_regcache (current_thread
, 1);
2155 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2156 lwp
->stop_pc
= status
.tpoint_addr
;
2158 /* Cancel any fast tracepoint lock this thread was
2160 force_unlock_trace_buffer ();
2163 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2166 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2167 "stopping all threads momentarily.\n");
2169 stop_all_lwps (1, lwp
);
2171 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2172 lwp
->exit_jump_pad_bkpt
= NULL
;
2174 unstop_all_lwps (1, lwp
);
2176 gdb_assert (lwp
->suspended
>= 0);
2182 debug_printf ("Checking whether LWP %ld needs to move out of the "
2184 lwpid_of (current_thread
));
2186 current_thread
= saved_thread
;
2190 /* Enqueue one signal in the "signals to report later when out of the
2194 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2196 struct pending_signals
*p_sig
;
2197 struct thread_info
*thread
= get_lwp_thread (lwp
);
2200 debug_printf ("Deferring signal %d for LWP %ld.\n",
2201 WSTOPSIG (*wstat
), lwpid_of (thread
));
2205 struct pending_signals
*sig
;
2207 for (sig
= lwp
->pending_signals_to_report
;
2210 debug_printf (" Already queued %d\n",
2213 debug_printf (" (no more currently queued signals)\n");
2216 /* Don't enqueue non-RT signals if they are already in the deferred
2217 queue. (SIGSTOP being the easiest signal to see ending up here
2219 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2221 struct pending_signals
*sig
;
2223 for (sig
= lwp
->pending_signals_to_report
;
2227 if (sig
->signal
== WSTOPSIG (*wstat
))
2230 debug_printf ("Not requeuing already queued non-RT signal %d"
2239 p_sig
= XCNEW (struct pending_signals
);
2240 p_sig
->prev
= lwp
->pending_signals_to_report
;
2241 p_sig
->signal
= WSTOPSIG (*wstat
);
2243 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2246 lwp
->pending_signals_to_report
= p_sig
;
2249 /* Dequeue one signal from the "signals to report later when out of
2250 the jump pad" list. */
2253 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2255 struct thread_info
*thread
= get_lwp_thread (lwp
);
2257 if (lwp
->pending_signals_to_report
!= NULL
)
2259 struct pending_signals
**p_sig
;
2261 p_sig
= &lwp
->pending_signals_to_report
;
2262 while ((*p_sig
)->prev
!= NULL
)
2263 p_sig
= &(*p_sig
)->prev
;
2265 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2266 if ((*p_sig
)->info
.si_signo
!= 0)
2267 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2273 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2274 WSTOPSIG (*wstat
), lwpid_of (thread
));
2278 struct pending_signals
*sig
;
2280 for (sig
= lwp
->pending_signals_to_report
;
2283 debug_printf (" Still queued %d\n",
2286 debug_printf (" (no more queued signals)\n");
2295 /* Fetch the possibly triggered data watchpoint info and store it in
2298 On some archs, like x86, that use debug registers to set
2299 watchpoints, it's possible that the way to know which watched
2300 address trapped, is to check the register that is used to select
2301 which address to watch. Problem is, between setting the watchpoint
2302 and reading back which data address trapped, the user may change
2303 the set of watchpoints, and, as a consequence, GDB changes the
2304 debug registers in the inferior. To avoid reading back a stale
2305 stopped-data-address when that happens, we cache in LP the fact
2306 that a watchpoint trapped, and the corresponding data address, as
2307 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2308 registers meanwhile, we have the cached data we can rely on. */
2311 check_stopped_by_watchpoint (struct lwp_info
*child
)
2313 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2315 struct thread_info
*saved_thread
;
2317 saved_thread
= current_thread
;
2318 current_thread
= get_lwp_thread (child
);
2320 if (the_low_target
.stopped_by_watchpoint ())
2322 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2324 if (the_low_target
.stopped_data_address
!= NULL
)
2325 child
->stopped_data_address
2326 = the_low_target
.stopped_data_address ();
2328 child
->stopped_data_address
= 0;
2331 current_thread
= saved_thread
;
2334 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2337 /* Return the ptrace options that we want to try to enable. */
2340 linux_low_ptrace_options (int attached
)
2345 options
|= PTRACE_O_EXITKILL
;
2347 if (report_fork_events
)
2348 options
|= PTRACE_O_TRACEFORK
;
2350 if (report_vfork_events
)
2351 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2353 if (report_exec_events
)
2354 options
|= PTRACE_O_TRACEEXEC
;
2356 options
|= PTRACE_O_TRACESYSGOOD
;
2361 /* Do low-level handling of the event, and check if we should go on
2362 and pass it to caller code. Return the affected lwp if we are, or
2365 static struct lwp_info
*
2366 linux_low_filter_event (int lwpid
, int wstat
)
2368 struct lwp_info
*child
;
2369 struct thread_info
*thread
;
2370 int have_stop_pc
= 0;
2372 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2374 /* Check for stop events reported by a process we didn't already
2375 know about - anything not already in our LWP list.
2377 If we're expecting to receive stopped processes after
2378 fork, vfork, and clone events, then we'll just add the
2379 new one to our list and go back to waiting for the event
2380 to be reported - the stopped process might be returned
2381 from waitpid before or after the event is.
2383 But note the case of a non-leader thread exec'ing after the
2384 leader having exited, and gone from our lists (because
2385 check_zombie_leaders deleted it). The non-leader thread
2386 changes its tid to the tgid. */
2388 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2389 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2393 /* A multi-thread exec after we had seen the leader exiting. */
2396 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2397 "after exec.\n", lwpid
);
2400 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2401 child
= add_lwp (child_ptid
);
2403 current_thread
= child
->thread
;
2406 /* If we didn't find a process, one of two things presumably happened:
2407 - A process we started and then detached from has exited. Ignore it.
2408 - A process we are controlling has forked and the new child's stop
2409 was reported to us by the kernel. Save its PID. */
2410 if (child
== NULL
&& WIFSTOPPED (wstat
))
2412 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2415 else if (child
== NULL
)
2418 thread
= get_lwp_thread (child
);
2422 child
->last_status
= wstat
;
2424 /* Check if the thread has exited. */
2425 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2428 debug_printf ("LLFE: %d exited.\n", lwpid
);
2430 if (finish_step_over (child
))
2432 /* Unsuspend all other LWPs, and set them back running again. */
2433 unsuspend_all_lwps (child
);
2436 /* If there is at least one more LWP, then the exit signal was
2437 not the end of the debugged application and should be
2438 ignored, unless GDB wants to hear about thread exits. */
2439 if (report_thread_events
2440 || last_thread_of_process_p (pid_of (thread
)))
2442 /* Since events are serialized to GDB core, and we can't
2443 report this one right now. Leave the status pending for
2444 the next time we're able to report it. */
2445 mark_lwp_dead (child
, wstat
);
2455 gdb_assert (WIFSTOPPED (wstat
));
2457 if (WIFSTOPPED (wstat
))
2459 struct process_info
*proc
;
2461 /* Architecture-specific setup after inferior is running. */
2462 proc
= find_process_pid (pid_of (thread
));
2463 if (proc
->tdesc
== NULL
)
2467 /* This needs to happen after we have attached to the
2468 inferior and it is stopped for the first time, but
2469 before we access any inferior registers. */
2470 linux_arch_setup_thread (thread
);
2474 /* The process is started, but GDBserver will do
2475 architecture-specific setup after the program stops at
2476 the first instruction. */
2477 child
->status_pending_p
= 1;
2478 child
->status_pending
= wstat
;
2484 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2486 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2487 int options
= linux_low_ptrace_options (proc
->attached
);
2489 linux_enable_event_reporting (lwpid
, options
);
2490 child
->must_set_ptrace_flags
= 0;
2493 /* Always update syscall_state, even if it will be filtered later. */
2494 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2496 child
->syscall_state
2497 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2498 ? TARGET_WAITKIND_SYSCALL_RETURN
2499 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2503 /* Almost all other ptrace-stops are known to be outside of system
2504 calls, with further exceptions in handle_extended_wait. */
2505 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2508 /* Be careful to not overwrite stop_pc until save_stop_reason is
2510 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2511 && linux_is_extended_waitstatus (wstat
))
2513 child
->stop_pc
= get_pc (child
);
2514 if (handle_extended_wait (&child
, wstat
))
2516 /* The event has been handled, so just return without
2522 if (linux_wstatus_maybe_breakpoint (wstat
))
2524 if (save_stop_reason (child
))
2529 child
->stop_pc
= get_pc (child
);
2531 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2532 && child
->stop_expected
)
2535 debug_printf ("Expected stop.\n");
2536 child
->stop_expected
= 0;
2538 if (thread
->last_resume_kind
== resume_stop
)
2540 /* We want to report the stop to the core. Treat the
2541 SIGSTOP as a normal event. */
2543 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2544 target_pid_to_str (ptid_of (thread
)));
2546 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2548 /* Stopping threads. We don't want this SIGSTOP to end up
2551 debug_printf ("LLW: SIGSTOP caught for %s "
2552 "while stopping threads.\n",
2553 target_pid_to_str (ptid_of (thread
)));
2558 /* This is a delayed SIGSTOP. Filter out the event. */
2560 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2561 child
->stepping
? "step" : "continue",
2562 target_pid_to_str (ptid_of (thread
)));
2564 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2569 child
->status_pending_p
= 1;
2570 child
->status_pending
= wstat
;
2574 /* Return true if THREAD is doing hardware single step. */
2577 maybe_hw_step (struct thread_info
*thread
)
2579 if (can_hardware_single_step ())
2583 /* GDBserver must insert single-step breakpoint for software
2585 gdb_assert (has_single_step_breakpoints (thread
));
2590 /* Resume LWPs that are currently stopped without any pending status
2591 to report, but are resumed from the core's perspective. */
2594 resume_stopped_resumed_lwps (thread_info
*thread
)
2596 struct lwp_info
*lp
= get_thread_lwp (thread
);
2600 && !lp
->status_pending_p
2601 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2605 if (thread
->last_resume_kind
== resume_step
)
2606 step
= maybe_hw_step (thread
);
2609 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2610 target_pid_to_str (ptid_of (thread
)),
2611 paddress (lp
->stop_pc
),
2614 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2618 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2619 match FILTER_PTID (leaving others pending). The PTIDs can be:
2620 minus_one_ptid, to specify any child; a pid PTID, specifying all
2621 lwps of a thread group; or a PTID representing a single lwp. Store
2622 the stop status through the status pointer WSTAT. OPTIONS is
2623 passed to the waitpid call. Return 0 if no event was found and
2624 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2625 was found. Return the PID of the stopped child otherwise. */
2628 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2629 int *wstatp
, int options
)
2631 struct thread_info
*event_thread
;
2632 struct lwp_info
*event_child
, *requested_child
;
2633 sigset_t block_mask
, prev_mask
;
2636 /* N.B. event_thread points to the thread_info struct that contains
2637 event_child. Keep them in sync. */
2638 event_thread
= NULL
;
2640 requested_child
= NULL
;
2642 /* Check for a lwp with a pending status. */
2644 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2646 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2648 return status_pending_p_callback (thread
, filter_ptid
);
2651 if (event_thread
!= NULL
)
2652 event_child
= get_thread_lwp (event_thread
);
2653 if (debug_threads
&& event_thread
)
2654 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2656 else if (!ptid_equal (filter_ptid
, null_ptid
))
2658 requested_child
= find_lwp_pid (filter_ptid
);
2660 if (stopping_threads
== NOT_STOPPING_THREADS
2661 && requested_child
->status_pending_p
2662 && (requested_child
->collecting_fast_tracepoint
2663 != fast_tpoint_collect_result::not_collecting
))
2665 enqueue_one_deferred_signal (requested_child
,
2666 &requested_child
->status_pending
);
2667 requested_child
->status_pending_p
= 0;
2668 requested_child
->status_pending
= 0;
2669 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2672 if (requested_child
->suspended
2673 && requested_child
->status_pending_p
)
2675 internal_error (__FILE__
, __LINE__
,
2676 "requesting an event out of a"
2677 " suspended child?");
2680 if (requested_child
->status_pending_p
)
2682 event_child
= requested_child
;
2683 event_thread
= get_lwp_thread (event_child
);
2687 if (event_child
!= NULL
)
2690 debug_printf ("Got an event from pending child %ld (%04x)\n",
2691 lwpid_of (event_thread
), event_child
->status_pending
);
2692 *wstatp
= event_child
->status_pending
;
2693 event_child
->status_pending_p
= 0;
2694 event_child
->status_pending
= 0;
2695 current_thread
= event_thread
;
2696 return lwpid_of (event_thread
);
2699 /* But if we don't find a pending event, we'll have to wait.
2701 We only enter this loop if no process has a pending wait status.
2702 Thus any action taken in response to a wait status inside this
2703 loop is responding as soon as we detect the status, not after any
2706 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2707 all signals while here. */
2708 sigfillset (&block_mask
);
2709 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2711 /* Always pull all events out of the kernel. We'll randomly select
2712 an event LWP out of all that have events, to prevent
2714 while (event_child
== NULL
)
2718 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2721 - If the thread group leader exits while other threads in the
2722 thread group still exist, waitpid(TGID, ...) hangs. That
2723 waitpid won't return an exit status until the other threads
2724 in the group are reaped.
2726 - When a non-leader thread execs, that thread just vanishes
2727 without reporting an exit (so we'd hang if we waited for it
2728 explicitly in that case). The exec event is reported to
2731 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2734 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2735 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2741 debug_printf ("LLW: waitpid %ld received %s\n",
2742 (long) ret
, status_to_str (*wstatp
));
2745 /* Filter all events. IOW, leave all events pending. We'll
2746 randomly select an event LWP out of all that have events
2748 linux_low_filter_event (ret
, *wstatp
);
2749 /* Retry until nothing comes out of waitpid. A single
2750 SIGCHLD can indicate more than one child stopped. */
2754 /* Now that we've pulled all events out of the kernel, resume
2755 LWPs that don't have an interesting event to report. */
2756 if (stopping_threads
== NOT_STOPPING_THREADS
)
2757 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2759 /* ... and find an LWP with a status to report to the core, if
2761 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2763 return status_pending_p_callback (thread
, filter_ptid
);
2766 if (event_thread
!= NULL
)
2768 event_child
= get_thread_lwp (event_thread
);
2769 *wstatp
= event_child
->status_pending
;
2770 event_child
->status_pending_p
= 0;
2771 event_child
->status_pending
= 0;
2775 /* Check for zombie thread group leaders. Those can't be reaped
2776 until all other threads in the thread group are. */
2777 check_zombie_leaders ();
2779 /* If there are no resumed children left in the set of LWPs we
2780 want to wait for, bail. We can't just block in
2781 waitpid/sigsuspend, because lwps might have been left stopped
2782 in trace-stop state, and we'd be stuck forever waiting for
2783 their status to change (which would only happen if we resumed
2784 them). Even if WNOHANG is set, this return code is preferred
2785 over 0 (below), as it is more detailed. */
2786 if ((find_inferior (&all_threads
,
2787 not_stopped_callback
,
2788 &wait_ptid
) == NULL
))
2791 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2792 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2796 /* No interesting event to report to the caller. */
2797 if ((options
& WNOHANG
))
2800 debug_printf ("WNOHANG set, no event found\n");
2802 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2806 /* Block until we get an event reported with SIGCHLD. */
2808 debug_printf ("sigsuspend'ing\n");
2810 sigsuspend (&prev_mask
);
2811 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2815 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2817 current_thread
= event_thread
;
2819 return lwpid_of (event_thread
);
2822 /* Wait for an event from child(ren) PTID. PTIDs can be:
2823 minus_one_ptid, to specify any child; a pid PTID, specifying all
2824 lwps of a thread group; or a PTID representing a single lwp. Store
2825 the stop status through the status pointer WSTAT. OPTIONS is
2826 passed to the waitpid call. Return 0 if no event was found and
2827 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2828 was found. Return the PID of the stopped child otherwise. */
2831 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2833 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2836 /* Count the LWP's that have had events. */
2839 count_events_callback (thread_info
*thread
, void *data
)
2841 struct lwp_info
*lp
= get_thread_lwp (thread
);
2842 int *count
= (int *) data
;
2844 gdb_assert (count
!= NULL
);
2846 /* Count only resumed LWPs that have an event pending. */
2847 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2848 && lp
->status_pending_p
)
2854 /* Select the LWP (if any) that is currently being single-stepped. */
2857 select_singlestep_lwp_callback (thread_info
*thread
, void *data
)
2859 struct lwp_info
*lp
= get_thread_lwp (thread
);
2861 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2862 && thread
->last_resume_kind
== resume_step
2863 && lp
->status_pending_p
)
2869 /* Select the Nth LWP that has had an event. */
2872 select_event_lwp_callback (thread_info
*thread
, void *data
)
2874 struct lwp_info
*lp
= get_thread_lwp (thread
);
2875 int *selector
= (int *) data
;
2877 gdb_assert (selector
!= NULL
);
2879 /* Select only resumed LWPs that have an event pending. */
2880 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2881 && lp
->status_pending_p
)
2882 if ((*selector
)-- == 0)
2888 /* Select one LWP out of those that have events pending. */
2891 select_event_lwp (struct lwp_info
**orig_lp
)
2894 int random_selector
;
2895 struct thread_info
*event_thread
= NULL
;
2897 /* In all-stop, give preference to the LWP that is being
2898 single-stepped. There will be at most one, and it's the LWP that
2899 the core is most interested in. If we didn't do this, then we'd
2900 have to handle pending step SIGTRAPs somehow in case the core
2901 later continues the previously-stepped thread, otherwise we'd
2902 report the pending SIGTRAP, and the core, not having stepped the
2903 thread, wouldn't understand what the trap was for, and therefore
2904 would report it to the user as a random signal. */
2908 = (struct thread_info
*) find_inferior (&all_threads
,
2909 select_singlestep_lwp_callback
,
2911 if (event_thread
!= NULL
)
2914 debug_printf ("SEL: Select single-step %s\n",
2915 target_pid_to_str (ptid_of (event_thread
)));
2918 if (event_thread
== NULL
)
2920 /* No single-stepping LWP. Select one at random, out of those
2921 which have had events. */
2923 /* First see how many events we have. */
2924 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2925 gdb_assert (num_events
> 0);
2927 /* Now randomly pick a LWP out of those that have had
2929 random_selector
= (int)
2930 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2932 if (debug_threads
&& num_events
> 1)
2933 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2934 num_events
, random_selector
);
2937 = (struct thread_info
*) find_inferior (&all_threads
,
2938 select_event_lwp_callback
,
2942 if (event_thread
!= NULL
)
2944 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2946 /* Switch the event LWP. */
2947 *orig_lp
= event_lp
;
2951 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2955 unsuspend_all_lwps (struct lwp_info
*except
)
2957 for_each_thread ([&] (thread_info
*thread
)
2959 lwp_info
*lwp
= get_thread_lwp (thread
);
2962 lwp_suspended_decr (lwp
);
2966 static void move_out_of_jump_pad_callback (thread_info
*thread
);
2967 static bool stuck_in_jump_pad_callback (thread_info
*thread
);
2968 static int lwp_running (thread_info
*thread
, void *data
);
2969 static ptid_t
linux_wait_1 (ptid_t ptid
,
2970 struct target_waitstatus
*ourstatus
,
2971 int target_options
);
2973 /* Stabilize threads (move out of jump pads).
2975 If a thread is midway collecting a fast tracepoint, we need to
2976 finish the collection and move it out of the jump pad before
2977 reporting the signal.
2979 This avoids recursion while collecting (when a signal arrives
2980 midway, and the signal handler itself collects), which would trash
2981 the trace buffer. In case the user set a breakpoint in a signal
2982 handler, this avoids the backtrace showing the jump pad, etc..
2983 Most importantly, there are certain things we can't do safely if
2984 threads are stopped in a jump pad (or in its callee's). For
2987 - starting a new trace run. A thread still collecting the
2988 previous run, could trash the trace buffer when resumed. The trace
2989 buffer control structures would have been reset but the thread had
2990 no way to tell. The thread could even midway memcpy'ing to the
2991 buffer, which would mean that when resumed, it would clobber the
2992 trace buffer that had been set for a new run.
2994 - we can't rewrite/reuse the jump pads for new tracepoints
2995 safely. Say you do tstart while a thread is stopped midway while
2996 collecting. When the thread is later resumed, it finishes the
2997 collection, and returns to the jump pad, to execute the original
2998 instruction that was under the tracepoint jump at the time the
2999 older run had been started. If the jump pad had been rewritten
3000 since for something else in the new run, the thread would now
3001 execute the wrong / random instructions. */
3004 linux_stabilize_threads (void)
3006 thread_info
*thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
3008 if (thread_stuck
!= NULL
)
3011 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
3012 lwpid_of (thread_stuck
));
3016 thread_info
*saved_thread
= current_thread
;
3018 stabilizing_threads
= 1;
3021 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
3023 /* Loop until all are stopped out of the jump pads. */
3024 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
3026 struct target_waitstatus ourstatus
;
3027 struct lwp_info
*lwp
;
3030 /* Note that we go through the full wait even loop. While
3031 moving threads out of jump pad, we need to be able to step
3032 over internal breakpoints and such. */
3033 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
3035 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
3037 lwp
= get_thread_lwp (current_thread
);
3040 lwp_suspended_inc (lwp
);
3042 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3043 || current_thread
->last_resume_kind
== resume_stop
)
3045 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3046 enqueue_one_deferred_signal (lwp
, &wstat
);
3051 unsuspend_all_lwps (NULL
);
3053 stabilizing_threads
= 0;
3055 current_thread
= saved_thread
;
3059 thread_stuck
= find_thread (stuck_in_jump_pad_callback
);
3061 if (thread_stuck
!= NULL
)
3062 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3063 lwpid_of (thread_stuck
));
3067 /* Convenience function that is called when the kernel reports an
3068 event that is not passed out to GDB. */
3071 ignore_event (struct target_waitstatus
*ourstatus
)
3073 /* If we got an event, there may still be others, as a single
3074 SIGCHLD can indicate more than one child stopped. This forces
3075 another target_wait call. */
3078 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3082 /* Convenience function that is called when the kernel reports an exit
3083 event. This decides whether to report the event to GDB as a
3084 process exit event, a thread exit event, or to suppress the
3088 filter_exit_event (struct lwp_info
*event_child
,
3089 struct target_waitstatus
*ourstatus
)
3091 struct thread_info
*thread
= get_lwp_thread (event_child
);
3092 ptid_t ptid
= ptid_of (thread
);
3094 if (!last_thread_of_process_p (pid_of (thread
)))
3096 if (report_thread_events
)
3097 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3099 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3101 delete_lwp (event_child
);
3106 /* Returns 1 if GDB is interested in any event_child syscalls. */
3109 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3111 struct thread_info
*thread
= get_lwp_thread (event_child
);
3112 struct process_info
*proc
= get_thread_process (thread
);
3114 return !proc
->syscalls_to_catch
.empty ();
3117 /* Returns 1 if GDB is interested in the event_child syscall.
3118 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3121 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3124 struct thread_info
*thread
= get_lwp_thread (event_child
);
3125 struct process_info
*proc
= get_thread_process (thread
);
3127 if (proc
->syscalls_to_catch
.empty ())
3130 if (proc
->syscalls_to_catch
[0] == ANY_SYSCALL
)
3133 get_syscall_trapinfo (event_child
, &sysno
);
3135 for (int iter
: proc
->syscalls_to_catch
)
3142 /* Wait for process, returns status. */
3145 linux_wait_1 (ptid_t ptid
,
3146 struct target_waitstatus
*ourstatus
, int target_options
)
3149 struct lwp_info
*event_child
;
3152 int step_over_finished
;
3153 int bp_explains_trap
;
3154 int maybe_internal_trap
;
3163 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3166 /* Translate generic target options into linux options. */
3168 if (target_options
& TARGET_WNOHANG
)
3171 bp_explains_trap
= 0;
3174 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3176 auto status_pending_p_any
= [&] (thread_info
*thread
)
3178 return status_pending_p_callback (thread
, minus_one_ptid
);
3181 /* Find a resumed LWP, if any. */
3182 if (find_thread (status_pending_p_any
) != NULL
)
3184 else if ((find_inferior (&all_threads
,
3185 not_stopped_callback
,
3186 &minus_one_ptid
) != NULL
))
3191 if (ptid_equal (step_over_bkpt
, null_ptid
))
3192 pid
= linux_wait_for_event (ptid
, &w
, options
);
3196 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3197 target_pid_to_str (step_over_bkpt
));
3198 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3201 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3203 gdb_assert (target_options
& TARGET_WNOHANG
);
3207 debug_printf ("linux_wait_1 ret = null_ptid, "
3208 "TARGET_WAITKIND_IGNORE\n");
3212 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3219 debug_printf ("linux_wait_1 ret = null_ptid, "
3220 "TARGET_WAITKIND_NO_RESUMED\n");
3224 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3228 event_child
= get_thread_lwp (current_thread
);
3230 /* linux_wait_for_event only returns an exit status for the last
3231 child of a process. Report it. */
3232 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3236 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3237 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3241 debug_printf ("linux_wait_1 ret = %s, exited with "
3243 target_pid_to_str (ptid_of (current_thread
)),
3250 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3251 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3255 debug_printf ("linux_wait_1 ret = %s, terminated with "
3257 target_pid_to_str (ptid_of (current_thread
)),
3263 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3264 return filter_exit_event (event_child
, ourstatus
);
3266 return ptid_of (current_thread
);
3269 /* If step-over executes a breakpoint instruction, in the case of a
3270 hardware single step it means a gdb/gdbserver breakpoint had been
3271 planted on top of a permanent breakpoint, in the case of a software
3272 single step it may just mean that gdbserver hit the reinsert breakpoint.
3273 The PC has been adjusted by save_stop_reason to point at
3274 the breakpoint address.
3275 So in the case of the hardware single step advance the PC manually
3276 past the breakpoint and in the case of software single step advance only
3277 if it's not the single_step_breakpoint we are hitting.
3278 This avoids that a program would keep trapping a permanent breakpoint
3280 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3281 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3282 && (event_child
->stepping
3283 || !single_step_breakpoint_inserted_here (event_child
->stop_pc
)))
3285 int increment_pc
= 0;
3286 int breakpoint_kind
= 0;
3287 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3290 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3291 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3295 debug_printf ("step-over for %s executed software breakpoint\n",
3296 target_pid_to_str (ptid_of (current_thread
)));
3299 if (increment_pc
!= 0)
3301 struct regcache
*regcache
3302 = get_thread_regcache (current_thread
, 1);
3304 event_child
->stop_pc
+= increment_pc
;
3305 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3307 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3308 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3312 /* If this event was not handled before, and is not a SIGTRAP, we
3313 report it. SIGILL and SIGSEGV are also treated as traps in case
3314 a breakpoint is inserted at the current PC. If this target does
3315 not support internal breakpoints at all, we also report the
3316 SIGTRAP without further processing; it's of no concern to us. */
3318 = (supports_breakpoints ()
3319 && (WSTOPSIG (w
) == SIGTRAP
3320 || ((WSTOPSIG (w
) == SIGILL
3321 || WSTOPSIG (w
) == SIGSEGV
)
3322 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3324 if (maybe_internal_trap
)
3326 /* Handle anything that requires bookkeeping before deciding to
3327 report the event or continue waiting. */
3329 /* First check if we can explain the SIGTRAP with an internal
3330 breakpoint, or if we should possibly report the event to GDB.
3331 Do this before anything that may remove or insert a
3333 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3335 /* We have a SIGTRAP, possibly a step-over dance has just
3336 finished. If so, tweak the state machine accordingly,
3337 reinsert breakpoints and delete any single-step
3339 step_over_finished
= finish_step_over (event_child
);
3341 /* Now invoke the callbacks of any internal breakpoints there. */
3342 check_breakpoints (event_child
->stop_pc
);
3344 /* Handle tracepoint data collecting. This may overflow the
3345 trace buffer, and cause a tracing stop, removing
3347 trace_event
= handle_tracepoints (event_child
);
3349 if (bp_explains_trap
)
3352 debug_printf ("Hit a gdbserver breakpoint.\n");
3357 /* We have some other signal, possibly a step-over dance was in
3358 progress, and it should be cancelled too. */
3359 step_over_finished
= finish_step_over (event_child
);
3362 /* We have all the data we need. Either report the event to GDB, or
3363 resume threads and keep waiting for more. */
3365 /* If we're collecting a fast tracepoint, finish the collection and
3366 move out of the jump pad before delivering a signal. See
3367 linux_stabilize_threads. */
3370 && WSTOPSIG (w
) != SIGTRAP
3371 && supports_fast_tracepoints ()
3372 && agent_loaded_p ())
3375 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3376 "to defer or adjust it.\n",
3377 WSTOPSIG (w
), lwpid_of (current_thread
));
3379 /* Allow debugging the jump pad itself. */
3380 if (current_thread
->last_resume_kind
!= resume_step
3381 && maybe_move_out_of_jump_pad (event_child
, &w
))
3383 enqueue_one_deferred_signal (event_child
, &w
);
3386 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3387 WSTOPSIG (w
), lwpid_of (current_thread
));
3389 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3393 return ignore_event (ourstatus
);
3397 if (event_child
->collecting_fast_tracepoint
3398 != fast_tpoint_collect_result::not_collecting
)
3401 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3402 "Check if we're already there.\n",
3403 lwpid_of (current_thread
),
3404 (int) event_child
->collecting_fast_tracepoint
);
3408 event_child
->collecting_fast_tracepoint
3409 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3411 if (event_child
->collecting_fast_tracepoint
3412 != fast_tpoint_collect_result::before_insn
)
3414 /* No longer need this breakpoint. */
3415 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3418 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3419 "stopping all threads momentarily.\n");
3421 /* Other running threads could hit this breakpoint.
3422 We don't handle moribund locations like GDB does,
3423 instead we always pause all threads when removing
3424 breakpoints, so that any step-over or
3425 decr_pc_after_break adjustment is always taken
3426 care of while the breakpoint is still
3428 stop_all_lwps (1, event_child
);
3430 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3431 event_child
->exit_jump_pad_bkpt
= NULL
;
3433 unstop_all_lwps (1, event_child
);
3435 gdb_assert (event_child
->suspended
>= 0);
3439 if (event_child
->collecting_fast_tracepoint
3440 == fast_tpoint_collect_result::not_collecting
)
3443 debug_printf ("fast tracepoint finished "
3444 "collecting successfully.\n");
3446 /* We may have a deferred signal to report. */
3447 if (dequeue_one_deferred_signal (event_child
, &w
))
3450 debug_printf ("dequeued one signal.\n");
3455 debug_printf ("no deferred signals.\n");
3457 if (stabilizing_threads
)
3459 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3460 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3464 debug_printf ("linux_wait_1 ret = %s, stopped "
3465 "while stabilizing threads\n",
3466 target_pid_to_str (ptid_of (current_thread
)));
3470 return ptid_of (current_thread
);
3476 /* Check whether GDB would be interested in this event. */
3478 /* Check if GDB is interested in this syscall. */
3480 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3481 && !gdb_catch_this_syscall_p (event_child
))
3485 debug_printf ("Ignored syscall for LWP %ld.\n",
3486 lwpid_of (current_thread
));
3489 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3494 return ignore_event (ourstatus
);
3497 /* If GDB is not interested in this signal, don't stop other
3498 threads, and don't report it to GDB. Just resume the inferior
3499 right away. We do this for threading-related signals as well as
3500 any that GDB specifically requested we ignore. But never ignore
3501 SIGSTOP if we sent it ourselves, and do not ignore signals when
3502 stepping - they may require special handling to skip the signal
3503 handler. Also never ignore signals that could be caused by a
3506 && current_thread
->last_resume_kind
!= resume_step
3508 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3509 (current_process ()->priv
->thread_db
!= NULL
3510 && (WSTOPSIG (w
) == __SIGRTMIN
3511 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3514 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3515 && !(WSTOPSIG (w
) == SIGSTOP
3516 && current_thread
->last_resume_kind
== resume_stop
)
3517 && !linux_wstatus_maybe_breakpoint (w
))))
3519 siginfo_t info
, *info_p
;
3522 debug_printf ("Ignored signal %d for LWP %ld.\n",
3523 WSTOPSIG (w
), lwpid_of (current_thread
));
3525 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3526 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3531 if (step_over_finished
)
3533 /* We cancelled this thread's step-over above. We still
3534 need to unsuspend all other LWPs, and set them back
3535 running again while the signal handler runs. */
3536 unsuspend_all_lwps (event_child
);
3538 /* Enqueue the pending signal info so that proceed_all_lwps
3540 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3542 proceed_all_lwps ();
3546 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3547 WSTOPSIG (w
), info_p
);
3553 return ignore_event (ourstatus
);
3556 /* Note that all addresses are always "out of the step range" when
3557 there's no range to begin with. */
3558 in_step_range
= lwp_in_step_range (event_child
);
3560 /* If GDB wanted this thread to single step, and the thread is out
3561 of the step range, we always want to report the SIGTRAP, and let
3562 GDB handle it. Watchpoints should always be reported. So should
3563 signals we can't explain. A SIGTRAP we can't explain could be a
3564 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3565 do, we're be able to handle GDB breakpoints on top of internal
3566 breakpoints, by handling the internal breakpoint and still
3567 reporting the event to GDB. If we don't, we're out of luck, GDB
3568 won't see the breakpoint hit. If we see a single-step event but
3569 the thread should be continuing, don't pass the trap to gdb.
3570 That indicates that we had previously finished a single-step but
3571 left the single-step pending -- see
3572 complete_ongoing_step_over. */
3573 report_to_gdb
= (!maybe_internal_trap
3574 || (current_thread
->last_resume_kind
== resume_step
3576 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3578 && !bp_explains_trap
3580 && !step_over_finished
3581 && !(current_thread
->last_resume_kind
== resume_continue
3582 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3583 || (gdb_breakpoint_here (event_child
->stop_pc
)
3584 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3585 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3586 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3588 run_breakpoint_commands (event_child
->stop_pc
);
3590 /* We found no reason GDB would want us to stop. We either hit one
3591 of our own breakpoints, or finished an internal step GDB
3592 shouldn't know about. */
3597 if (bp_explains_trap
)
3598 debug_printf ("Hit a gdbserver breakpoint.\n");
3599 if (step_over_finished
)
3600 debug_printf ("Step-over finished.\n");
3602 debug_printf ("Tracepoint event.\n");
3603 if (lwp_in_step_range (event_child
))
3604 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3605 paddress (event_child
->stop_pc
),
3606 paddress (event_child
->step_range_start
),
3607 paddress (event_child
->step_range_end
));
3610 /* We're not reporting this breakpoint to GDB, so apply the
3611 decr_pc_after_break adjustment to the inferior's regcache
3614 if (the_low_target
.set_pc
!= NULL
)
3616 struct regcache
*regcache
3617 = get_thread_regcache (current_thread
, 1);
3618 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3621 if (step_over_finished
)
3623 /* If we have finished stepping over a breakpoint, we've
3624 stopped and suspended all LWPs momentarily except the
3625 stepping one. This is where we resume them all again.
3626 We're going to keep waiting, so use proceed, which
3627 handles stepping over the next breakpoint. */
3628 unsuspend_all_lwps (event_child
);
3632 /* Remove the single-step breakpoints if any. Note that
3633 there isn't single-step breakpoint if we finished stepping
3635 if (can_software_single_step ()
3636 && has_single_step_breakpoints (current_thread
))
3638 stop_all_lwps (0, event_child
);
3639 delete_single_step_breakpoints (current_thread
);
3640 unstop_all_lwps (0, event_child
);
3645 debug_printf ("proceeding all threads.\n");
3646 proceed_all_lwps ();
3651 return ignore_event (ourstatus
);
3656 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3659 = target_waitstatus_to_string (&event_child
->waitstatus
);
3661 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3662 lwpid_of (get_lwp_thread (event_child
)), str
.c_str ());
3664 if (current_thread
->last_resume_kind
== resume_step
)
3666 if (event_child
->step_range_start
== event_child
->step_range_end
)
3667 debug_printf ("GDB wanted to single-step, reporting event.\n");
3668 else if (!lwp_in_step_range (event_child
))
3669 debug_printf ("Out of step range, reporting event.\n");
3671 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3672 debug_printf ("Stopped by watchpoint.\n");
3673 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3674 debug_printf ("Stopped by GDB breakpoint.\n");
3676 debug_printf ("Hit a non-gdbserver trap event.\n");
3679 /* Alright, we're going to report a stop. */
3681 /* Remove single-step breakpoints. */
3682 if (can_software_single_step ())
3684 /* Remove single-step breakpoints or not. It it is true, stop all
3685 lwps, so that other threads won't hit the breakpoint in the
3687 int remove_single_step_breakpoints_p
= 0;
3691 remove_single_step_breakpoints_p
3692 = has_single_step_breakpoints (current_thread
);
3696 /* In all-stop, a stop reply cancels all previous resume
3697 requests. Delete all single-step breakpoints. */
3699 find_thread ([&] (thread_info
*thread
) {
3700 if (has_single_step_breakpoints (thread
))
3702 remove_single_step_breakpoints_p
= 1;
3710 if (remove_single_step_breakpoints_p
)
3712 /* If we remove single-step breakpoints from memory, stop all lwps,
3713 so that other threads won't hit the breakpoint in the staled
3715 stop_all_lwps (0, event_child
);
3719 gdb_assert (has_single_step_breakpoints (current_thread
));
3720 delete_single_step_breakpoints (current_thread
);
3724 for_each_thread ([] (thread_info
*thread
){
3725 if (has_single_step_breakpoints (thread
))
3726 delete_single_step_breakpoints (thread
);
3730 unstop_all_lwps (0, event_child
);
3734 if (!stabilizing_threads
)
3736 /* In all-stop, stop all threads. */
3738 stop_all_lwps (0, NULL
);
3740 if (step_over_finished
)
3744 /* If we were doing a step-over, all other threads but
3745 the stepping one had been paused in start_step_over,
3746 with their suspend counts incremented. We don't want
3747 to do a full unstop/unpause, because we're in
3748 all-stop mode (so we want threads stopped), but we
3749 still need to unsuspend the other threads, to
3750 decrement their `suspended' count back. */
3751 unsuspend_all_lwps (event_child
);
3755 /* If we just finished a step-over, then all threads had
3756 been momentarily paused. In all-stop, that's fine,
3757 we want threads stopped by now anyway. In non-stop,
3758 we need to re-resume threads that GDB wanted to be
3760 unstop_all_lwps (1, event_child
);
3764 /* If we're not waiting for a specific LWP, choose an event LWP
3765 from among those that have had events. Giving equal priority
3766 to all LWPs that have had events helps prevent
3768 if (ptid_equal (ptid
, minus_one_ptid
))
3770 event_child
->status_pending_p
= 1;
3771 event_child
->status_pending
= w
;
3773 select_event_lwp (&event_child
);
3775 /* current_thread and event_child must stay in sync. */
3776 current_thread
= get_lwp_thread (event_child
);
3778 event_child
->status_pending_p
= 0;
3779 w
= event_child
->status_pending
;
3783 /* Stabilize threads (move out of jump pads). */
3785 stabilize_threads ();
3789 /* If we just finished a step-over, then all threads had been
3790 momentarily paused. In all-stop, that's fine, we want
3791 threads stopped by now anyway. In non-stop, we need to
3792 re-resume threads that GDB wanted to be running. */
3793 if (step_over_finished
)
3794 unstop_all_lwps (1, event_child
);
3797 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3799 /* If the reported event is an exit, fork, vfork or exec, let
3802 /* Break the unreported fork relationship chain. */
3803 if (event_child
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
3804 || event_child
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
)
3806 event_child
->fork_relative
->fork_relative
= NULL
;
3807 event_child
->fork_relative
= NULL
;
3810 *ourstatus
= event_child
->waitstatus
;
3811 /* Clear the event lwp's waitstatus since we handled it already. */
3812 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3815 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3817 /* Now that we've selected our final event LWP, un-adjust its PC if
3818 it was a software breakpoint, and the client doesn't know we can
3819 adjust the breakpoint ourselves. */
3820 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3821 && !swbreak_feature
)
3823 int decr_pc
= the_low_target
.decr_pc_after_break
;
3827 struct regcache
*regcache
3828 = get_thread_regcache (current_thread
, 1);
3829 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3833 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3835 get_syscall_trapinfo (event_child
,
3836 &ourstatus
->value
.syscall_number
);
3837 ourstatus
->kind
= event_child
->syscall_state
;
3839 else if (current_thread
->last_resume_kind
== resume_stop
3840 && WSTOPSIG (w
) == SIGSTOP
)
3842 /* A thread that has been requested to stop by GDB with vCont;t,
3843 and it stopped cleanly, so report as SIG0. The use of
3844 SIGSTOP is an implementation detail. */
3845 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3847 else if (current_thread
->last_resume_kind
== resume_stop
3848 && WSTOPSIG (w
) != SIGSTOP
)
3850 /* A thread that has been requested to stop by GDB with vCont;t,
3851 but, it stopped for other reasons. */
3852 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3854 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3856 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3859 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3863 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3864 target_pid_to_str (ptid_of (current_thread
)),
3865 ourstatus
->kind
, ourstatus
->value
.sig
);
3869 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3870 return filter_exit_event (event_child
, ourstatus
);
3872 return ptid_of (current_thread
);
3875 /* Get rid of any pending event in the pipe. */
3877 async_file_flush (void)
3883 ret
= read (linux_event_pipe
[0], &buf
, 1);
3884 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3887 /* Put something in the pipe, so the event loop wakes up. */
3889 async_file_mark (void)
3893 async_file_flush ();
3896 ret
= write (linux_event_pipe
[1], "+", 1);
3897 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3899 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3900 be awakened anyway. */
3904 linux_wait (ptid_t ptid
,
3905 struct target_waitstatus
*ourstatus
, int target_options
)
3909 /* Flush the async file first. */
3910 if (target_is_async_p ())
3911 async_file_flush ();
3915 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3917 while ((target_options
& TARGET_WNOHANG
) == 0
3918 && ptid_equal (event_ptid
, null_ptid
)
3919 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3921 /* If at least one stop was reported, there may be more. A single
3922 SIGCHLD can signal more than one child stop. */
3923 if (target_is_async_p ()
3924 && (target_options
& TARGET_WNOHANG
) != 0
3925 && !ptid_equal (event_ptid
, null_ptid
))
3931 /* Send a signal to an LWP. */
3934 kill_lwp (unsigned long lwpid
, int signo
)
3939 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3940 if (errno
== ENOSYS
)
3942 /* If tkill fails, then we are not using nptl threads, a
3943 configuration we no longer support. */
3944 perror_with_name (("tkill"));
3950 linux_stop_lwp (struct lwp_info
*lwp
)
3956 send_sigstop (struct lwp_info
*lwp
)
3960 pid
= lwpid_of (get_lwp_thread (lwp
));
3962 /* If we already have a pending stop signal for this process, don't
3964 if (lwp
->stop_expected
)
3967 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3973 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3975 lwp
->stop_expected
= 1;
3976 kill_lwp (pid
, SIGSTOP
);
3980 send_sigstop_callback (thread_info
*thread
, void *except
)
3982 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3984 /* Ignore EXCEPT. */
3995 /* Increment the suspend count of an LWP, and stop it, if not stopped
3998 suspend_and_send_sigstop_callback (thread_info
*thread
, void *except
)
4000 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4002 /* Ignore EXCEPT. */
4006 lwp_suspended_inc (lwp
);
4008 return send_sigstop_callback (thread
, except
);
4012 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
4014 /* Store the exit status for later. */
4015 lwp
->status_pending_p
= 1;
4016 lwp
->status_pending
= wstat
;
4018 /* Store in waitstatus as well, as there's nothing else to process
4020 if (WIFEXITED (wstat
))
4022 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
4023 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
4025 else if (WIFSIGNALED (wstat
))
4027 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
4028 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
4031 /* Prevent trying to stop it. */
4034 /* No further stops are expected from a dead lwp. */
4035 lwp
->stop_expected
= 0;
4038 /* Return true if LWP has exited already, and has a pending exit event
4039 to report to GDB. */
4042 lwp_is_marked_dead (struct lwp_info
*lwp
)
4044 return (lwp
->status_pending_p
4045 && (WIFEXITED (lwp
->status_pending
)
4046 || WIFSIGNALED (lwp
->status_pending
)));
4049 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4052 wait_for_sigstop (void)
4054 struct thread_info
*saved_thread
;
4059 saved_thread
= current_thread
;
4060 if (saved_thread
!= NULL
)
4061 saved_tid
= saved_thread
->id
;
4063 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4066 debug_printf ("wait_for_sigstop: pulling events\n");
4068 /* Passing NULL_PTID as filter indicates we want all events to be
4069 left pending. Eventually this returns when there are no
4070 unwaited-for children left. */
4071 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4073 gdb_assert (ret
== -1);
4075 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4076 current_thread
= saved_thread
;
4080 debug_printf ("Previously current thread died.\n");
4082 /* We can't change the current inferior behind GDB's back,
4083 otherwise, a subsequent command may apply to the wrong
4085 current_thread
= NULL
;
4089 /* Returns true if THREAD is stopped in a jump pad, and we can't
4090 move it out, because we need to report the stop event to GDB. For
4091 example, if the user puts a breakpoint in the jump pad, it's
4092 because she wants to debug it. */
4095 stuck_in_jump_pad_callback (thread_info
*thread
)
4097 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4099 if (lwp
->suspended
!= 0)
4101 internal_error (__FILE__
, __LINE__
,
4102 "LWP %ld is suspended, suspended=%d\n",
4103 lwpid_of (thread
), lwp
->suspended
);
4105 gdb_assert (lwp
->stopped
);
4107 /* Allow debugging the jump pad, gdb_collect, etc.. */
4108 return (supports_fast_tracepoints ()
4109 && agent_loaded_p ()
4110 && (gdb_breakpoint_here (lwp
->stop_pc
)
4111 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4112 || thread
->last_resume_kind
== resume_step
)
4113 && (linux_fast_tracepoint_collecting (lwp
, NULL
)
4114 != fast_tpoint_collect_result::not_collecting
));
4118 move_out_of_jump_pad_callback (thread_info
*thread
)
4120 struct thread_info
*saved_thread
;
4121 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4124 if (lwp
->suspended
!= 0)
4126 internal_error (__FILE__
, __LINE__
,
4127 "LWP %ld is suspended, suspended=%d\n",
4128 lwpid_of (thread
), lwp
->suspended
);
4130 gdb_assert (lwp
->stopped
);
4132 /* For gdb_breakpoint_here. */
4133 saved_thread
= current_thread
;
4134 current_thread
= thread
;
4136 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4138 /* Allow debugging the jump pad, gdb_collect, etc. */
4139 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4140 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4141 && thread
->last_resume_kind
!= resume_step
4142 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4145 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4150 lwp
->status_pending_p
= 0;
4151 enqueue_one_deferred_signal (lwp
, wstat
);
4154 debug_printf ("Signal %d for LWP %ld deferred "
4156 WSTOPSIG (*wstat
), lwpid_of (thread
));
4159 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4162 lwp_suspended_inc (lwp
);
4164 current_thread
= saved_thread
;
4168 lwp_running (thread_info
*thread
, void *data
)
4170 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4172 if (lwp_is_marked_dead (lwp
))
4179 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4180 If SUSPEND, then also increase the suspend count of every LWP,
4184 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4186 /* Should not be called recursively. */
4187 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4192 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4193 suspend
? "stop-and-suspend" : "stop",
4195 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4199 stopping_threads
= (suspend
4200 ? STOPPING_AND_SUSPENDING_THREADS
4201 : STOPPING_THREADS
);
4204 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
4206 find_inferior (&all_threads
, send_sigstop_callback
, except
);
4207 wait_for_sigstop ();
4208 stopping_threads
= NOT_STOPPING_THREADS
;
4212 debug_printf ("stop_all_lwps done, setting stopping_threads "
4213 "back to !stopping\n");
4218 /* Enqueue one signal in the chain of signals which need to be
4219 delivered to this process on next resume. */
4222 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4224 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4226 p_sig
->prev
= lwp
->pending_signals
;
4227 p_sig
->signal
= signal
;
4229 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4231 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4232 lwp
->pending_signals
= p_sig
;
4235 /* Install breakpoints for software single stepping. */
4238 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4240 struct thread_info
*thread
= get_lwp_thread (lwp
);
4241 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4242 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
4244 current_thread
= thread
;
4245 std::vector
<CORE_ADDR
> next_pcs
= the_low_target
.get_next_pcs (regcache
);
4247 for (CORE_ADDR pc
: next_pcs
)
4248 set_single_step_breakpoint (pc
, current_ptid
);
4250 do_cleanups (old_chain
);
4253 /* Single step via hardware or software single step.
4254 Return 1 if hardware single stepping, 0 if software single stepping
4255 or can't single step. */
4258 single_step (struct lwp_info
* lwp
)
4262 if (can_hardware_single_step ())
4266 else if (can_software_single_step ())
4268 install_software_single_step_breakpoints (lwp
);
4274 debug_printf ("stepping is not implemented on this target");
4280 /* The signal can be delivered to the inferior if we are not trying to
4281 finish a fast tracepoint collect. Since signal can be delivered in
4282 the step-over, the program may go to signal handler and trap again
4283 after return from the signal handler. We can live with the spurious
4287 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4289 return (lwp
->collecting_fast_tracepoint
4290 == fast_tpoint_collect_result::not_collecting
);
4293 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4294 SIGNAL is nonzero, give it that signal. */
4297 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4298 int step
, int signal
, siginfo_t
*info
)
4300 struct thread_info
*thread
= get_lwp_thread (lwp
);
4301 struct thread_info
*saved_thread
;
4303 struct process_info
*proc
= get_thread_process (thread
);
4305 /* Note that target description may not be initialised
4306 (proc->tdesc == NULL) at this point because the program hasn't
4307 stopped at the first instruction yet. It means GDBserver skips
4308 the extra traps from the wrapper program (see option --wrapper).
4309 Code in this function that requires register access should be
4310 guarded by proc->tdesc == NULL or something else. */
4312 if (lwp
->stopped
== 0)
4315 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4317 fast_tpoint_collect_result fast_tp_collecting
4318 = lwp
->collecting_fast_tracepoint
;
4320 gdb_assert (!stabilizing_threads
4321 || (fast_tp_collecting
4322 != fast_tpoint_collect_result::not_collecting
));
4324 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4325 user used the "jump" command, or "set $pc = foo"). */
4326 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4328 /* Collecting 'while-stepping' actions doesn't make sense
4330 release_while_stepping_state_list (thread
);
4333 /* If we have pending signals or status, and a new signal, enqueue the
4334 signal. Also enqueue the signal if it can't be delivered to the
4335 inferior right now. */
4337 && (lwp
->status_pending_p
4338 || lwp
->pending_signals
!= NULL
4339 || !lwp_signal_can_be_delivered (lwp
)))
4341 enqueue_pending_signal (lwp
, signal
, info
);
4343 /* Postpone any pending signal. It was enqueued above. */
4347 if (lwp
->status_pending_p
)
4350 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4351 " has pending status\n",
4352 lwpid_of (thread
), step
? "step" : "continue",
4353 lwp
->stop_expected
? "expected" : "not expected");
4357 saved_thread
= current_thread
;
4358 current_thread
= thread
;
4360 /* This bit needs some thinking about. If we get a signal that
4361 we must report while a single-step reinsert is still pending,
4362 we often end up resuming the thread. It might be better to
4363 (ew) allow a stack of pending events; then we could be sure that
4364 the reinsert happened right away and not lose any signals.
4366 Making this stack would also shrink the window in which breakpoints are
4367 uninserted (see comment in linux_wait_for_lwp) but not enough for
4368 complete correctness, so it won't solve that problem. It may be
4369 worthwhile just to solve this one, however. */
4370 if (lwp
->bp_reinsert
!= 0)
4373 debug_printf (" pending reinsert at 0x%s\n",
4374 paddress (lwp
->bp_reinsert
));
4376 if (can_hardware_single_step ())
4378 if (fast_tp_collecting
== fast_tpoint_collect_result::not_collecting
)
4381 warning ("BAD - reinserting but not stepping.");
4383 warning ("BAD - reinserting and suspended(%d).",
4388 step
= maybe_hw_step (thread
);
4391 if (fast_tp_collecting
== fast_tpoint_collect_result::before_insn
)
4394 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4395 " (exit-jump-pad-bkpt)\n",
4398 else if (fast_tp_collecting
== fast_tpoint_collect_result::at_insn
)
4401 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4402 " single-stepping\n",
4405 if (can_hardware_single_step ())
4409 internal_error (__FILE__
, __LINE__
,
4410 "moving out of jump pad single-stepping"
4411 " not implemented on this target");
4415 /* If we have while-stepping actions in this thread set it stepping.
4416 If we have a signal to deliver, it may or may not be set to
4417 SIG_IGN, we don't know. Assume so, and allow collecting
4418 while-stepping into a signal handler. A possible smart thing to
4419 do would be to set an internal breakpoint at the signal return
4420 address, continue, and carry on catching this while-stepping
4421 action only when that breakpoint is hit. A future
4423 if (thread
->while_stepping
!= NULL
)
4426 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4429 step
= single_step (lwp
);
4432 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4434 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4436 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4440 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4441 (long) lwp
->stop_pc
);
4445 /* If we have pending signals, consume one if it can be delivered to
4447 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4449 struct pending_signals
**p_sig
;
4451 p_sig
= &lwp
->pending_signals
;
4452 while ((*p_sig
)->prev
!= NULL
)
4453 p_sig
= &(*p_sig
)->prev
;
4455 signal
= (*p_sig
)->signal
;
4456 if ((*p_sig
)->info
.si_signo
!= 0)
4457 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4465 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4466 lwpid_of (thread
), step
? "step" : "continue", signal
,
4467 lwp
->stop_expected
? "expected" : "not expected");
4469 if (the_low_target
.prepare_to_resume
!= NULL
)
4470 the_low_target
.prepare_to_resume (lwp
);
4472 regcache_invalidate_thread (thread
);
4474 lwp
->stepping
= step
;
4476 ptrace_request
= PTRACE_SINGLESTEP
;
4477 else if (gdb_catching_syscalls_p (lwp
))
4478 ptrace_request
= PTRACE_SYSCALL
;
4480 ptrace_request
= PTRACE_CONT
;
4481 ptrace (ptrace_request
,
4483 (PTRACE_TYPE_ARG3
) 0,
4484 /* Coerce to a uintptr_t first to avoid potential gcc warning
4485 of coercing an 8 byte integer to a 4 byte pointer. */
4486 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4488 current_thread
= saved_thread
;
4490 perror_with_name ("resuming thread");
4492 /* Successfully resumed. Clear state that no longer makes sense,
4493 and mark the LWP as running. Must not do this before resuming
4494 otherwise if that fails other code will be confused. E.g., we'd
4495 later try to stop the LWP and hang forever waiting for a stop
4496 status. Note that we must not throw after this is cleared,
4497 otherwise handle_zombie_lwp_error would get confused. */
4499 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4502 /* Called when we try to resume a stopped LWP and that errors out. If
4503 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4504 or about to become), discard the error, clear any pending status
4505 the LWP may have, and return true (we'll collect the exit status
4506 soon enough). Otherwise, return false. */
4509 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4511 struct thread_info
*thread
= get_lwp_thread (lp
);
4513 /* If we get an error after resuming the LWP successfully, we'd
4514 confuse !T state for the LWP being gone. */
4515 gdb_assert (lp
->stopped
);
4517 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4518 because even if ptrace failed with ESRCH, the tracee may be "not
4519 yet fully dead", but already refusing ptrace requests. In that
4520 case the tracee has 'R (Running)' state for a little bit
4521 (observed in Linux 3.18). See also the note on ESRCH in the
4522 ptrace(2) man page. Instead, check whether the LWP has any state
4523 other than ptrace-stopped. */
4525 /* Don't assume anything if /proc/PID/status can't be read. */
4526 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4528 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4529 lp
->status_pending_p
= 0;
4535 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4536 disappears while we try to resume it. */
4539 linux_resume_one_lwp (struct lwp_info
*lwp
,
4540 int step
, int signal
, siginfo_t
*info
)
4544 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4546 CATCH (ex
, RETURN_MASK_ERROR
)
4548 if (!check_ptrace_stopped_lwp_gone (lwp
))
4549 throw_exception (ex
);
4554 /* This function is called once per thread via for_each_thread.
4555 We look up which resume request applies to THREAD and mark it with a
4556 pointer to the appropriate resume request.
4558 This algorithm is O(threads * resume elements), but resume elements
4559 is small (and will remain small at least until GDB supports thread
4563 linux_set_resume_request (thread_info
*thread
, thread_resume
*resume
, size_t n
)
4565 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4567 for (int ndx
= 0; ndx
< n
; ndx
++)
4569 ptid_t ptid
= resume
[ndx
].thread
;
4570 if (ptid_equal (ptid
, minus_one_ptid
)
4571 || ptid
== thread
->id
4572 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4574 || (ptid_get_pid (ptid
) == pid_of (thread
)
4575 && (ptid_is_pid (ptid
)
4576 || ptid_get_lwp (ptid
) == -1)))
4578 if (resume
[ndx
].kind
== resume_stop
4579 && thread
->last_resume_kind
== resume_stop
)
4582 debug_printf ("already %s LWP %ld at GDB's request\n",
4583 (thread
->last_status
.kind
4584 == TARGET_WAITKIND_STOPPED
)
4592 /* Ignore (wildcard) resume requests for already-resumed
4594 if (resume
[ndx
].kind
!= resume_stop
4595 && thread
->last_resume_kind
!= resume_stop
)
4598 debug_printf ("already %s LWP %ld at GDB's request\n",
4599 (thread
->last_resume_kind
4607 /* Don't let wildcard resumes resume fork children that GDB
4608 does not yet know are new fork children. */
4609 if (lwp
->fork_relative
!= NULL
)
4611 struct lwp_info
*rel
= lwp
->fork_relative
;
4613 if (rel
->status_pending_p
4614 && (rel
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
4615 || rel
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
))
4618 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4624 /* If the thread has a pending event that has already been
4625 reported to GDBserver core, but GDB has not pulled the
4626 event out of the vStopped queue yet, likewise, ignore the
4627 (wildcard) resume request. */
4628 if (in_queued_stop_replies (thread
->id
))
4631 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4636 lwp
->resume
= &resume
[ndx
];
4637 thread
->last_resume_kind
= lwp
->resume
->kind
;
4639 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4640 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4642 /* If we had a deferred signal to report, dequeue one now.
4643 This can happen if LWP gets more than one signal while
4644 trying to get out of a jump pad. */
4646 && !lwp
->status_pending_p
4647 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4649 lwp
->status_pending_p
= 1;
4652 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4653 "leaving status pending.\n",
4654 WSTOPSIG (lwp
->status_pending
),
4662 /* No resume action for this thread. */
4666 /* find_inferior callback for linux_resume.
4667 Set *FLAG_P if this lwp has an interesting status pending. */
4670 resume_status_pending_p (thread_info
*thread
)
4672 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4674 /* LWPs which will not be resumed are not interesting, because
4675 we might not wait for them next time through linux_wait. */
4676 if (lwp
->resume
== NULL
)
4679 return thread_still_has_status_pending_p (thread
);
4682 /* Return 1 if this lwp that GDB wants running is stopped at an
4683 internal breakpoint that we need to step over. It assumes that any
4684 required STOP_PC adjustment has already been propagated to the
4685 inferior's regcache. */
4688 need_step_over_p (thread_info
*thread
)
4690 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4691 struct thread_info
*saved_thread
;
4693 struct process_info
*proc
= get_thread_process (thread
);
4695 /* GDBserver is skipping the extra traps from the wrapper program,
4696 don't have to do step over. */
4697 if (proc
->tdesc
== NULL
)
4700 /* LWPs which will not be resumed are not interesting, because we
4701 might not wait for them next time through linux_wait. */
4706 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4711 if (thread
->last_resume_kind
== resume_stop
)
4714 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4720 gdb_assert (lwp
->suspended
>= 0);
4725 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4730 if (lwp
->status_pending_p
)
4733 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4739 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4743 /* If the PC has changed since we stopped, then don't do anything,
4744 and let the breakpoint/tracepoint be hit. This happens if, for
4745 instance, GDB handled the decr_pc_after_break subtraction itself,
4746 GDB is OOL stepping this thread, or the user has issued a "jump"
4747 command, or poked thread's registers herself. */
4748 if (pc
!= lwp
->stop_pc
)
4751 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4752 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4754 paddress (lwp
->stop_pc
), paddress (pc
));
4758 /* On software single step target, resume the inferior with signal
4759 rather than stepping over. */
4760 if (can_software_single_step ()
4761 && lwp
->pending_signals
!= NULL
4762 && lwp_signal_can_be_delivered (lwp
))
4765 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4772 saved_thread
= current_thread
;
4773 current_thread
= thread
;
4775 /* We can only step over breakpoints we know about. */
4776 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4778 /* Don't step over a breakpoint that GDB expects to hit
4779 though. If the condition is being evaluated on the target's side
4780 and it evaluate to false, step over this breakpoint as well. */
4781 if (gdb_breakpoint_here (pc
)
4782 && gdb_condition_true_at_breakpoint (pc
)
4783 && gdb_no_commands_at_breakpoint (pc
))
4786 debug_printf ("Need step over [LWP %ld]? yes, but found"
4787 " GDB breakpoint at 0x%s; skipping step over\n",
4788 lwpid_of (thread
), paddress (pc
));
4790 current_thread
= saved_thread
;
4796 debug_printf ("Need step over [LWP %ld]? yes, "
4797 "found breakpoint at 0x%s\n",
4798 lwpid_of (thread
), paddress (pc
));
4800 /* We've found an lwp that needs stepping over --- return 1 so
4801 that find_inferior stops looking. */
4802 current_thread
= saved_thread
;
4808 current_thread
= saved_thread
;
4811 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4813 lwpid_of (thread
), paddress (pc
));
4818 /* Start a step-over operation on LWP. When LWP stopped at a
4819 breakpoint, to make progress, we need to remove the breakpoint out
4820 of the way. If we let other threads run while we do that, they may
4821 pass by the breakpoint location and miss hitting it. To avoid
4822 that, a step-over momentarily stops all threads while LWP is
4823 single-stepped by either hardware or software while the breakpoint
4824 is temporarily uninserted from the inferior. When the single-step
4825 finishes, we reinsert the breakpoint, and let all threads that are
4826 supposed to be running, run again. */
4829 start_step_over (struct lwp_info
*lwp
)
4831 struct thread_info
*thread
= get_lwp_thread (lwp
);
4832 struct thread_info
*saved_thread
;
4837 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4840 stop_all_lwps (1, lwp
);
4842 if (lwp
->suspended
!= 0)
4844 internal_error (__FILE__
, __LINE__
,
4845 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4850 debug_printf ("Done stopping all threads for step-over.\n");
4852 /* Note, we should always reach here with an already adjusted PC,
4853 either by GDB (if we're resuming due to GDB's request), or by our
4854 caller, if we just finished handling an internal breakpoint GDB
4855 shouldn't care about. */
4858 saved_thread
= current_thread
;
4859 current_thread
= thread
;
4861 lwp
->bp_reinsert
= pc
;
4862 uninsert_breakpoints_at (pc
);
4863 uninsert_fast_tracepoint_jumps_at (pc
);
4865 step
= single_step (lwp
);
4867 current_thread
= saved_thread
;
4869 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4871 /* Require next event from this LWP. */
4872 step_over_bkpt
= thread
->id
;
4876 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4877 start_step_over, if still there, and delete any single-step
4878 breakpoints we've set, on non hardware single-step targets. */
4881 finish_step_over (struct lwp_info
*lwp
)
4883 if (lwp
->bp_reinsert
!= 0)
4885 struct thread_info
*saved_thread
= current_thread
;
4888 debug_printf ("Finished step over.\n");
4890 current_thread
= get_lwp_thread (lwp
);
4892 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4893 may be no breakpoint to reinsert there by now. */
4894 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4895 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4897 lwp
->bp_reinsert
= 0;
4899 /* Delete any single-step breakpoints. No longer needed. We
4900 don't have to worry about other threads hitting this trap,
4901 and later not being able to explain it, because we were
4902 stepping over a breakpoint, and we hold all threads but
4903 LWP stopped while doing that. */
4904 if (!can_hardware_single_step ())
4906 gdb_assert (has_single_step_breakpoints (current_thread
));
4907 delete_single_step_breakpoints (current_thread
);
4910 step_over_bkpt
= null_ptid
;
4911 current_thread
= saved_thread
;
4918 /* If there's a step over in progress, wait until all threads stop
4919 (that is, until the stepping thread finishes its step), and
4920 unsuspend all lwps. The stepping thread ends with its status
4921 pending, which is processed later when we get back to processing
4925 complete_ongoing_step_over (void)
4927 if (!ptid_equal (step_over_bkpt
, null_ptid
))
4929 struct lwp_info
*lwp
;
4934 debug_printf ("detach: step over in progress, finish it first\n");
4936 /* Passing NULL_PTID as filter indicates we want all events to
4937 be left pending. Eventually this returns when there are no
4938 unwaited-for children left. */
4939 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4941 gdb_assert (ret
== -1);
4943 lwp
= find_lwp_pid (step_over_bkpt
);
4945 finish_step_over (lwp
);
4946 step_over_bkpt
= null_ptid
;
4947 unsuspend_all_lwps (lwp
);
4951 /* This function is called once per thread. We check the thread's resume
4952 request, which will tell us whether to resume, step, or leave the thread
4953 stopped; and what signal, if any, it should be sent.
4955 For threads which we aren't explicitly told otherwise, we preserve
4956 the stepping flag; this is used for stepping over gdbserver-placed
4959 If pending_flags was set in any thread, we queue any needed
4960 signals, since we won't actually resume. We already have a pending
4961 event to report, so we don't need to preserve any step requests;
4962 they should be re-issued if necessary. */
4965 linux_resume_one_thread (thread_info
*thread
, void *arg
)
4967 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4968 int leave_all_stopped
= * (int *) arg
;
4971 if (lwp
->resume
== NULL
)
4974 if (lwp
->resume
->kind
== resume_stop
)
4977 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4982 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
4984 /* Stop the thread, and wait for the event asynchronously,
4985 through the event loop. */
4991 debug_printf ("already stopped LWP %ld\n",
4994 /* The LWP may have been stopped in an internal event that
4995 was not meant to be notified back to GDB (e.g., gdbserver
4996 breakpoint), so we should be reporting a stop event in
4999 /* If the thread already has a pending SIGSTOP, this is a
5000 no-op. Otherwise, something later will presumably resume
5001 the thread and this will cause it to cancel any pending
5002 operation, due to last_resume_kind == resume_stop. If
5003 the thread already has a pending status to report, we
5004 will still report it the next time we wait - see
5005 status_pending_p_callback. */
5007 /* If we already have a pending signal to report, then
5008 there's no need to queue a SIGSTOP, as this means we're
5009 midway through moving the LWP out of the jumppad, and we
5010 will report the pending signal as soon as that is
5012 if (lwp
->pending_signals_to_report
== NULL
)
5016 /* For stop requests, we're done. */
5018 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5022 /* If this thread which is about to be resumed has a pending status,
5023 then don't resume it - we can just report the pending status.
5024 Likewise if it is suspended, because e.g., another thread is
5025 stepping past a breakpoint. Make sure to queue any signals that
5026 would otherwise be sent. In all-stop mode, we do this decision
5027 based on if *any* thread has a pending status. If there's a
5028 thread that needs the step-over-breakpoint dance, then don't
5029 resume any other thread but that particular one. */
5030 leave_pending
= (lwp
->suspended
5031 || lwp
->status_pending_p
5032 || leave_all_stopped
);
5034 /* If we have a new signal, enqueue the signal. */
5035 if (lwp
->resume
->sig
!= 0)
5037 siginfo_t info
, *info_p
;
5039 /* If this is the same signal we were previously stopped by,
5040 make sure to queue its siginfo. */
5041 if (WIFSTOPPED (lwp
->last_status
)
5042 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
5043 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
5044 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
5049 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
5055 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
5057 proceed_one_lwp (thread
, NULL
);
5062 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5065 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5071 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5073 struct thread_info
*need_step_over
= NULL
;
5074 int leave_all_stopped
;
5079 debug_printf ("linux_resume:\n");
5082 for_each_thread ([&] (thread_info
*thread
)
5084 linux_set_resume_request (thread
, resume_info
, n
);
5087 /* If there is a thread which would otherwise be resumed, which has
5088 a pending status, then don't resume any threads - we can just
5089 report the pending status. Make sure to queue any signals that
5090 would otherwise be sent. In non-stop mode, we'll apply this
5091 logic to each thread individually. We consume all pending events
5092 before considering to start a step-over (in all-stop). */
5093 bool any_pending
= false;
5095 any_pending
= find_thread (resume_status_pending_p
) != NULL
;
5097 /* If there is a thread which would otherwise be resumed, which is
5098 stopped at a breakpoint that needs stepping over, then don't
5099 resume any threads - have it step over the breakpoint with all
5100 other threads stopped, then resume all threads again. Make sure
5101 to queue any signals that would otherwise be delivered or
5103 if (!any_pending
&& supports_breakpoints ())
5104 need_step_over
= find_thread (need_step_over_p
);
5106 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5110 if (need_step_over
!= NULL
)
5111 debug_printf ("Not resuming all, need step over\n");
5112 else if (any_pending
)
5113 debug_printf ("Not resuming, all-stop and found "
5114 "an LWP with pending status\n");
5116 debug_printf ("Resuming, no pending status or step over needed\n");
5119 /* Even if we're leaving threads stopped, queue all signals we'd
5120 otherwise deliver. */
5121 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
5124 start_step_over (get_thread_lwp (need_step_over
));
5128 debug_printf ("linux_resume done\n");
5132 /* We may have events that were pending that can/should be sent to
5133 the client now. Trigger a linux_wait call. */
5134 if (target_is_async_p ())
5138 /* This function is called once per thread. We check the thread's
5139 last resume request, which will tell us whether to resume, step, or
5140 leave the thread stopped. Any signal the client requested to be
5141 delivered has already been enqueued at this point.
5143 If any thread that GDB wants running is stopped at an internal
5144 breakpoint that needs stepping over, we start a step-over operation
5145 on that particular thread, and leave all others stopped. */
5148 proceed_one_lwp (thread_info
*thread
, void *except
)
5150 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5157 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5162 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5166 if (thread
->last_resume_kind
== resume_stop
5167 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5170 debug_printf (" client wants LWP to remain %ld stopped\n",
5175 if (lwp
->status_pending_p
)
5178 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5183 gdb_assert (lwp
->suspended
>= 0);
5188 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5192 if (thread
->last_resume_kind
== resume_stop
5193 && lwp
->pending_signals_to_report
== NULL
5194 && (lwp
->collecting_fast_tracepoint
5195 == fast_tpoint_collect_result::not_collecting
))
5197 /* We haven't reported this LWP as stopped yet (otherwise, the
5198 last_status.kind check above would catch it, and we wouldn't
5199 reach here. This LWP may have been momentarily paused by a
5200 stop_all_lwps call while handling for example, another LWP's
5201 step-over. In that case, the pending expected SIGSTOP signal
5202 that was queued at vCont;t handling time will have already
5203 been consumed by wait_for_sigstop, and so we need to requeue
5204 another one here. Note that if the LWP already has a SIGSTOP
5205 pending, this is a no-op. */
5208 debug_printf ("Client wants LWP %ld to stop. "
5209 "Making sure it has a SIGSTOP pending\n",
5215 if (thread
->last_resume_kind
== resume_step
)
5218 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5221 /* If resume_step is requested by GDB, install single-step
5222 breakpoints when the thread is about to be actually resumed if
5223 the single-step breakpoints weren't removed. */
5224 if (can_software_single_step ()
5225 && !has_single_step_breakpoints (thread
))
5226 install_software_single_step_breakpoints (lwp
);
5228 step
= maybe_hw_step (thread
);
5230 else if (lwp
->bp_reinsert
!= 0)
5233 debug_printf (" stepping LWP %ld, reinsert set\n",
5236 step
= maybe_hw_step (thread
);
5241 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5246 unsuspend_and_proceed_one_lwp (thread_info
*thread
, void *except
)
5248 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5253 lwp_suspended_decr (lwp
);
5255 return proceed_one_lwp (thread
, except
);
5258 /* When we finish a step-over, set threads running again. If there's
5259 another thread that may need a step-over, now's the time to start
5260 it. Eventually, we'll move all threads past their breakpoints. */
5263 proceed_all_lwps (void)
5265 struct thread_info
*need_step_over
;
5267 /* If there is a thread which would otherwise be resumed, which is
5268 stopped at a breakpoint that needs stepping over, then don't
5269 resume any threads - have it step over the breakpoint with all
5270 other threads stopped, then resume all threads again. */
5272 if (supports_breakpoints ())
5274 need_step_over
= find_thread (need_step_over_p
);
5276 if (need_step_over
!= NULL
)
5279 debug_printf ("proceed_all_lwps: found "
5280 "thread %ld needing a step-over\n",
5281 lwpid_of (need_step_over
));
5283 start_step_over (get_thread_lwp (need_step_over
));
5289 debug_printf ("Proceeding, no step-over needed\n");
5291 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
5294 /* Stopped LWPs that the client wanted to be running, that don't have
5295 pending statuses, are set to run again, except for EXCEPT, if not
5296 NULL. This undoes a stop_all_lwps call. */
5299 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5305 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5306 lwpid_of (get_lwp_thread (except
)));
5308 debug_printf ("unstopping all lwps\n");
5312 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
5314 find_inferior (&all_threads
, proceed_one_lwp
, except
);
5318 debug_printf ("unstop_all_lwps done\n");
5324 #ifdef HAVE_LINUX_REGSETS
5326 #define use_linux_regsets 1
5328 /* Returns true if REGSET has been disabled. */
5331 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5333 return (info
->disabled_regsets
!= NULL
5334 && info
->disabled_regsets
[regset
- info
->regsets
]);
5337 /* Disable REGSET. */
5340 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5344 dr_offset
= regset
- info
->regsets
;
5345 if (info
->disabled_regsets
== NULL
)
5346 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5347 info
->disabled_regsets
[dr_offset
] = 1;
5351 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5352 struct regcache
*regcache
)
5354 struct regset_info
*regset
;
5355 int saw_general_regs
= 0;
5359 pid
= lwpid_of (current_thread
);
5360 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5365 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5368 buf
= xmalloc (regset
->size
);
5370 nt_type
= regset
->nt_type
;
5374 iov
.iov_len
= regset
->size
;
5375 data
= (void *) &iov
;
5381 res
= ptrace (regset
->get_request
, pid
,
5382 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5384 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5390 /* If we get EIO on a regset, do not try it again for
5391 this process mode. */
5392 disable_regset (regsets_info
, regset
);
5394 else if (errno
== ENODATA
)
5396 /* ENODATA may be returned if the regset is currently
5397 not "active". This can happen in normal operation,
5398 so suppress the warning in this case. */
5400 else if (errno
== ESRCH
)
5402 /* At this point, ESRCH should mean the process is
5403 already gone, in which case we simply ignore attempts
5404 to read its registers. */
5409 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5416 if (regset
->type
== GENERAL_REGS
)
5417 saw_general_regs
= 1;
5418 regset
->store_function (regcache
, buf
);
5422 if (saw_general_regs
)
5429 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5430 struct regcache
*regcache
)
5432 struct regset_info
*regset
;
5433 int saw_general_regs
= 0;
5437 pid
= lwpid_of (current_thread
);
5438 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5443 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5444 || regset
->fill_function
== NULL
)
5447 buf
= xmalloc (regset
->size
);
5449 /* First fill the buffer with the current register set contents,
5450 in case there are any items in the kernel's regset that are
5451 not in gdbserver's regcache. */
5453 nt_type
= regset
->nt_type
;
5457 iov
.iov_len
= regset
->size
;
5458 data
= (void *) &iov
;
5464 res
= ptrace (regset
->get_request
, pid
,
5465 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5467 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5472 /* Then overlay our cached registers on that. */
5473 regset
->fill_function (regcache
, buf
);
5475 /* Only now do we write the register set. */
5477 res
= ptrace (regset
->set_request
, pid
,
5478 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5480 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5488 /* If we get EIO on a regset, do not try it again for
5489 this process mode. */
5490 disable_regset (regsets_info
, regset
);
5492 else if (errno
== ESRCH
)
5494 /* At this point, ESRCH should mean the process is
5495 already gone, in which case we simply ignore attempts
5496 to change its registers. See also the related
5497 comment in linux_resume_one_lwp. */
5503 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5506 else if (regset
->type
== GENERAL_REGS
)
5507 saw_general_regs
= 1;
5510 if (saw_general_regs
)
5516 #else /* !HAVE_LINUX_REGSETS */
5518 #define use_linux_regsets 0
5519 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5520 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5524 /* Return 1 if register REGNO is supported by one of the regset ptrace
5525 calls or 0 if it has to be transferred individually. */
5528 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5530 unsigned char mask
= 1 << (regno
% 8);
5531 size_t index
= regno
/ 8;
5533 return (use_linux_regsets
5534 && (regs_info
->regset_bitmap
== NULL
5535 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5538 #ifdef HAVE_LINUX_USRREGS
5541 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5545 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5546 error ("Invalid register number %d.", regnum
);
5548 addr
= usrregs
->regmap
[regnum
];
5553 /* Fetch one register. */
5555 fetch_register (const struct usrregs_info
*usrregs
,
5556 struct regcache
*regcache
, int regno
)
5563 if (regno
>= usrregs
->num_regs
)
5565 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5568 regaddr
= register_addr (usrregs
, regno
);
5572 size
= ((register_size (regcache
->tdesc
, regno
)
5573 + sizeof (PTRACE_XFER_TYPE
) - 1)
5574 & -sizeof (PTRACE_XFER_TYPE
));
5575 buf
= (char *) alloca (size
);
5577 pid
= lwpid_of (current_thread
);
5578 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5581 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5582 ptrace (PTRACE_PEEKUSER
, pid
,
5583 /* Coerce to a uintptr_t first to avoid potential gcc warning
5584 of coercing an 8 byte integer to a 4 byte pointer. */
5585 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5586 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5588 error ("reading register %d: %s", regno
, strerror (errno
));
5591 if (the_low_target
.supply_ptrace_register
)
5592 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5594 supply_register (regcache
, regno
, buf
);
5597 /* Store one register. */
5599 store_register (const struct usrregs_info
*usrregs
,
5600 struct regcache
*regcache
, int regno
)
5607 if (regno
>= usrregs
->num_regs
)
5609 if ((*the_low_target
.cannot_store_register
) (regno
))
5612 regaddr
= register_addr (usrregs
, regno
);
5616 size
= ((register_size (regcache
->tdesc
, regno
)
5617 + sizeof (PTRACE_XFER_TYPE
) - 1)
5618 & -sizeof (PTRACE_XFER_TYPE
));
5619 buf
= (char *) alloca (size
);
5620 memset (buf
, 0, size
);
5622 if (the_low_target
.collect_ptrace_register
)
5623 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5625 collect_register (regcache
, regno
, buf
);
5627 pid
= lwpid_of (current_thread
);
5628 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5631 ptrace (PTRACE_POKEUSER
, pid
,
5632 /* Coerce to a uintptr_t first to avoid potential gcc warning
5633 about coercing an 8 byte integer to a 4 byte pointer. */
5634 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5635 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5638 /* At this point, ESRCH should mean the process is
5639 already gone, in which case we simply ignore attempts
5640 to change its registers. See also the related
5641 comment in linux_resume_one_lwp. */
5645 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5646 error ("writing register %d: %s", regno
, strerror (errno
));
5648 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5652 /* Fetch all registers, or just one, from the child process.
5653 If REGNO is -1, do this for all registers, skipping any that are
5654 assumed to have been retrieved by regsets_fetch_inferior_registers,
5655 unless ALL is non-zero.
5656 Otherwise, REGNO specifies which register (so we can save time). */
5658 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5659 struct regcache
*regcache
, int regno
, int all
)
5661 struct usrregs_info
*usr
= regs_info
->usrregs
;
5665 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5666 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5667 fetch_register (usr
, regcache
, regno
);
5670 fetch_register (usr
, regcache
, regno
);
5673 /* Store our register values back into the inferior.
5674 If REGNO is -1, do this for all registers, skipping any that are
5675 assumed to have been saved by regsets_store_inferior_registers,
5676 unless ALL is non-zero.
5677 Otherwise, REGNO specifies which register (so we can save time). */
5679 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5680 struct regcache
*regcache
, int regno
, int all
)
5682 struct usrregs_info
*usr
= regs_info
->usrregs
;
5686 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5687 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5688 store_register (usr
, regcache
, regno
);
5691 store_register (usr
, regcache
, regno
);
5694 #else /* !HAVE_LINUX_USRREGS */
5696 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5697 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5703 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5707 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5711 if (the_low_target
.fetch_register
!= NULL
5712 && regs_info
->usrregs
!= NULL
)
5713 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5714 (*the_low_target
.fetch_register
) (regcache
, regno
);
5716 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5717 if (regs_info
->usrregs
!= NULL
)
5718 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5722 if (the_low_target
.fetch_register
!= NULL
5723 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5726 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5728 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5730 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5731 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5736 linux_store_registers (struct regcache
*regcache
, int regno
)
5740 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5744 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5746 if (regs_info
->usrregs
!= NULL
)
5747 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5751 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5753 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5755 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5756 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5761 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5762 to debugger memory starting at MYADDR. */
5765 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5767 int pid
= lwpid_of (current_thread
);
5768 PTRACE_XFER_TYPE
*buffer
;
5776 /* Try using /proc. Don't bother for one word. */
5777 if (len
>= 3 * sizeof (long))
5781 /* We could keep this file open and cache it - possibly one per
5782 thread. That requires some juggling, but is even faster. */
5783 sprintf (filename
, "/proc/%d/mem", pid
);
5784 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5788 /* If pread64 is available, use it. It's faster if the kernel
5789 supports it (only one syscall), and it's 64-bit safe even on
5790 32-bit platforms (for instance, SPARC debugging a SPARC64
5793 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5796 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5797 bytes
= read (fd
, myaddr
, len
);
5804 /* Some data was read, we'll try to get the rest with ptrace. */
5814 /* Round starting address down to longword boundary. */
5815 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5816 /* Round ending address up; get number of longwords that makes. */
5817 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5818 / sizeof (PTRACE_XFER_TYPE
));
5819 /* Allocate buffer of that many longwords. */
5820 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5822 /* Read all the longwords */
5824 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5826 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5827 about coercing an 8 byte integer to a 4 byte pointer. */
5828 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5829 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5830 (PTRACE_TYPE_ARG4
) 0);
5836 /* Copy appropriate bytes out of the buffer. */
5839 i
*= sizeof (PTRACE_XFER_TYPE
);
5840 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5842 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5849 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5850 memory at MEMADDR. On failure (cannot write to the inferior)
5851 returns the value of errno. Always succeeds if LEN is zero. */
5854 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5857 /* Round starting address down to longword boundary. */
5858 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5859 /* Round ending address up; get number of longwords that makes. */
5861 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5862 / sizeof (PTRACE_XFER_TYPE
);
5864 /* Allocate buffer of that many longwords. */
5865 PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5867 int pid
= lwpid_of (current_thread
);
5871 /* Zero length write always succeeds. */
5877 /* Dump up to four bytes. */
5878 char str
[4 * 2 + 1];
5880 int dump
= len
< 4 ? len
: 4;
5882 for (i
= 0; i
< dump
; i
++)
5884 sprintf (p
, "%02x", myaddr
[i
]);
5889 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5890 str
, (long) memaddr
, pid
);
5893 /* Fill start and end extra bytes of buffer with existing memory data. */
5896 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5897 about coercing an 8 byte integer to a 4 byte pointer. */
5898 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5899 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5900 (PTRACE_TYPE_ARG4
) 0);
5908 = ptrace (PTRACE_PEEKTEXT
, pid
,
5909 /* Coerce to a uintptr_t first to avoid potential gcc warning
5910 about coercing an 8 byte integer to a 4 byte pointer. */
5911 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5912 * sizeof (PTRACE_XFER_TYPE
)),
5913 (PTRACE_TYPE_ARG4
) 0);
5918 /* Copy data to be written over corresponding part of buffer. */
5920 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5923 /* Write the entire buffer. */
5925 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5928 ptrace (PTRACE_POKETEXT
, pid
,
5929 /* Coerce to a uintptr_t first to avoid potential gcc warning
5930 about coercing an 8 byte integer to a 4 byte pointer. */
5931 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5932 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5941 linux_look_up_symbols (void)
5943 #ifdef USE_THREAD_DB
5944 struct process_info
*proc
= current_process ();
5946 if (proc
->priv
->thread_db
!= NULL
)
5954 linux_request_interrupt (void)
5956 /* Send a SIGINT to the process group. This acts just like the user
5957 typed a ^C on the controlling terminal. */
5958 kill (-signal_pid
, SIGINT
);
5961 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5962 to debugger memory starting at MYADDR. */
5965 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5967 char filename
[PATH_MAX
];
5969 int pid
= lwpid_of (current_thread
);
5971 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5973 fd
= open (filename
, O_RDONLY
);
5977 if (offset
!= (CORE_ADDR
) 0
5978 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5981 n
= read (fd
, myaddr
, len
);
5988 /* These breakpoint and watchpoint related wrapper functions simply
5989 pass on the function call if the target has registered a
5990 corresponding function. */
5993 linux_supports_z_point_type (char z_type
)
5995 return (the_low_target
.supports_z_point_type
!= NULL
5996 && the_low_target
.supports_z_point_type (z_type
));
6000 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6001 int size
, struct raw_breakpoint
*bp
)
6003 if (type
== raw_bkpt_type_sw
)
6004 return insert_memory_breakpoint (bp
);
6005 else if (the_low_target
.insert_point
!= NULL
)
6006 return the_low_target
.insert_point (type
, addr
, size
, bp
);
6008 /* Unsupported (see target.h). */
6013 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6014 int size
, struct raw_breakpoint
*bp
)
6016 if (type
== raw_bkpt_type_sw
)
6017 return remove_memory_breakpoint (bp
);
6018 else if (the_low_target
.remove_point
!= NULL
)
6019 return the_low_target
.remove_point (type
, addr
, size
, bp
);
6021 /* Unsupported (see target.h). */
6025 /* Implement the to_stopped_by_sw_breakpoint target_ops
6029 linux_stopped_by_sw_breakpoint (void)
6031 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6033 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
6036 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
6040 linux_supports_stopped_by_sw_breakpoint (void)
6042 return USE_SIGTRAP_SIGINFO
;
6045 /* Implement the to_stopped_by_hw_breakpoint target_ops
6049 linux_stopped_by_hw_breakpoint (void)
6051 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6053 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6056 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6060 linux_supports_stopped_by_hw_breakpoint (void)
6062 return USE_SIGTRAP_SIGINFO
;
6065 /* Implement the supports_hardware_single_step target_ops method. */
6068 linux_supports_hardware_single_step (void)
6070 return can_hardware_single_step ();
6074 linux_supports_software_single_step (void)
6076 return can_software_single_step ();
6080 linux_stopped_by_watchpoint (void)
6082 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6084 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6088 linux_stopped_data_address (void)
6090 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6092 return lwp
->stopped_data_address
;
6095 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6096 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6097 && defined(PT_TEXT_END_ADDR)
6099 /* This is only used for targets that define PT_TEXT_ADDR,
6100 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6101 the target has different ways of acquiring this information, like
6104 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6105 to tell gdb about. */
6108 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6110 unsigned long text
, text_end
, data
;
6111 int pid
= lwpid_of (current_thread
);
6115 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6116 (PTRACE_TYPE_ARG4
) 0);
6117 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6118 (PTRACE_TYPE_ARG4
) 0);
6119 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6120 (PTRACE_TYPE_ARG4
) 0);
6124 /* Both text and data offsets produced at compile-time (and so
6125 used by gdb) are relative to the beginning of the program,
6126 with the data segment immediately following the text segment.
6127 However, the actual runtime layout in memory may put the data
6128 somewhere else, so when we send gdb a data base-address, we
6129 use the real data base address and subtract the compile-time
6130 data base-address from it (which is just the length of the
6131 text segment). BSS immediately follows data in both
6134 *data_p
= data
- (text_end
- text
);
6143 linux_qxfer_osdata (const char *annex
,
6144 unsigned char *readbuf
, unsigned const char *writebuf
,
6145 CORE_ADDR offset
, int len
)
6147 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6150 /* Convert a native/host siginfo object, into/from the siginfo in the
6151 layout of the inferiors' architecture. */
6154 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6158 if (the_low_target
.siginfo_fixup
!= NULL
)
6159 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6161 /* If there was no callback, or the callback didn't do anything,
6162 then just do a straight memcpy. */
6166 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6168 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6173 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6174 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6178 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6180 if (current_thread
== NULL
)
6183 pid
= lwpid_of (current_thread
);
6186 debug_printf ("%s siginfo for lwp %d.\n",
6187 readbuf
!= NULL
? "Reading" : "Writing",
6190 if (offset
>= sizeof (siginfo
))
6193 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6196 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6197 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6198 inferior with a 64-bit GDBSERVER should look the same as debugging it
6199 with a 32-bit GDBSERVER, we need to convert it. */
6200 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6202 if (offset
+ len
> sizeof (siginfo
))
6203 len
= sizeof (siginfo
) - offset
;
6205 if (readbuf
!= NULL
)
6206 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6209 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6211 /* Convert back to ptrace layout before flushing it out. */
6212 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6214 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6221 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6222 so we notice when children change state; as the handler for the
6223 sigsuspend in my_waitpid. */
6226 sigchld_handler (int signo
)
6228 int old_errno
= errno
;
6234 /* fprintf is not async-signal-safe, so call write
6236 if (write (2, "sigchld_handler\n",
6237 sizeof ("sigchld_handler\n") - 1) < 0)
6238 break; /* just ignore */
6242 if (target_is_async_p ())
6243 async_file_mark (); /* trigger a linux_wait */
6249 linux_supports_non_stop (void)
6255 linux_async (int enable
)
6257 int previous
= target_is_async_p ();
6260 debug_printf ("linux_async (%d), previous=%d\n",
6263 if (previous
!= enable
)
6266 sigemptyset (&mask
);
6267 sigaddset (&mask
, SIGCHLD
);
6269 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6273 if (pipe (linux_event_pipe
) == -1)
6275 linux_event_pipe
[0] = -1;
6276 linux_event_pipe
[1] = -1;
6277 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6279 warning ("creating event pipe failed.");
6283 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6284 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6286 /* Register the event loop handler. */
6287 add_file_handler (linux_event_pipe
[0],
6288 handle_target_event
, NULL
);
6290 /* Always trigger a linux_wait. */
6295 delete_file_handler (linux_event_pipe
[0]);
6297 close (linux_event_pipe
[0]);
6298 close (linux_event_pipe
[1]);
6299 linux_event_pipe
[0] = -1;
6300 linux_event_pipe
[1] = -1;
6303 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6310 linux_start_non_stop (int nonstop
)
6312 /* Register or unregister from event-loop accordingly. */
6313 linux_async (nonstop
);
6315 if (target_is_async_p () != (nonstop
!= 0))
6322 linux_supports_multi_process (void)
6327 /* Check if fork events are supported. */
6330 linux_supports_fork_events (void)
6332 return linux_supports_tracefork ();
6335 /* Check if vfork events are supported. */
6338 linux_supports_vfork_events (void)
6340 return linux_supports_tracefork ();
6343 /* Check if exec events are supported. */
6346 linux_supports_exec_events (void)
6348 return linux_supports_traceexec ();
6351 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6352 ptrace flags for all inferiors. This is in case the new GDB connection
6353 doesn't support the same set of events that the previous one did. */
6356 linux_handle_new_gdb_connection (void)
6358 /* Request that all the lwps reset their ptrace options. */
6359 for_each_thread ([] (thread_info
*thread
)
6361 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6365 /* Stop the lwp so we can modify its ptrace options. */
6366 lwp
->must_set_ptrace_flags
= 1;
6367 linux_stop_lwp (lwp
);
6371 /* Already stopped; go ahead and set the ptrace options. */
6372 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6373 int options
= linux_low_ptrace_options (proc
->attached
);
6375 linux_enable_event_reporting (lwpid_of (thread
), options
);
6376 lwp
->must_set_ptrace_flags
= 0;
6382 linux_supports_disable_randomization (void)
6384 #ifdef HAVE_PERSONALITY
6392 linux_supports_agent (void)
6398 linux_supports_range_stepping (void)
6400 if (can_software_single_step ())
6402 if (*the_low_target
.supports_range_stepping
== NULL
)
6405 return (*the_low_target
.supports_range_stepping
) ();
6408 /* Enumerate spufs IDs for process PID. */
6410 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6416 struct dirent
*entry
;
6418 sprintf (path
, "/proc/%ld/fd", pid
);
6419 dir
= opendir (path
);
6424 while ((entry
= readdir (dir
)) != NULL
)
6430 fd
= atoi (entry
->d_name
);
6434 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6435 if (stat (path
, &st
) != 0)
6437 if (!S_ISDIR (st
.st_mode
))
6440 if (statfs (path
, &stfs
) != 0)
6442 if (stfs
.f_type
!= SPUFS_MAGIC
)
6445 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6447 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6457 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6458 object type, using the /proc file system. */
6460 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6461 unsigned const char *writebuf
,
6462 CORE_ADDR offset
, int len
)
6464 long pid
= lwpid_of (current_thread
);
6469 if (!writebuf
&& !readbuf
)
6477 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6480 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6481 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6486 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6493 ret
= write (fd
, writebuf
, (size_t) len
);
6495 ret
= read (fd
, readbuf
, (size_t) len
);
6501 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6502 struct target_loadseg
6504 /* Core address to which the segment is mapped. */
6506 /* VMA recorded in the program header. */
6508 /* Size of this segment in memory. */
6512 # if defined PT_GETDSBT
6513 struct target_loadmap
6515 /* Protocol version number, must be zero. */
6517 /* Pointer to the DSBT table, its size, and the DSBT index. */
6518 unsigned *dsbt_table
;
6519 unsigned dsbt_size
, dsbt_index
;
6520 /* Number of segments in this map. */
6522 /* The actual memory map. */
6523 struct target_loadseg segs
[/*nsegs*/];
6525 # define LINUX_LOADMAP PT_GETDSBT
6526 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6527 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6529 struct target_loadmap
6531 /* Protocol version number, must be zero. */
6533 /* Number of segments in this map. */
6535 /* The actual memory map. */
6536 struct target_loadseg segs
[/*nsegs*/];
6538 # define LINUX_LOADMAP PTRACE_GETFDPIC
6539 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6540 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6544 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6545 unsigned char *myaddr
, unsigned int len
)
6547 int pid
= lwpid_of (current_thread
);
6549 struct target_loadmap
*data
= NULL
;
6550 unsigned int actual_length
, copy_length
;
6552 if (strcmp (annex
, "exec") == 0)
6553 addr
= (int) LINUX_LOADMAP_EXEC
;
6554 else if (strcmp (annex
, "interp") == 0)
6555 addr
= (int) LINUX_LOADMAP_INTERP
;
6559 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6565 actual_length
= sizeof (struct target_loadmap
)
6566 + sizeof (struct target_loadseg
) * data
->nsegs
;
6568 if (offset
< 0 || offset
> actual_length
)
6571 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6572 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6576 # define linux_read_loadmap NULL
6577 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6580 linux_process_qsupported (char **features
, int count
)
6582 if (the_low_target
.process_qsupported
!= NULL
)
6583 the_low_target
.process_qsupported (features
, count
);
6587 linux_supports_catch_syscall (void)
6589 return (the_low_target
.get_syscall_trapinfo
!= NULL
6590 && linux_supports_tracesysgood ());
6594 linux_get_ipa_tdesc_idx (void)
6596 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6599 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6603 linux_supports_tracepoints (void)
6605 if (*the_low_target
.supports_tracepoints
== NULL
)
6608 return (*the_low_target
.supports_tracepoints
) ();
6612 linux_read_pc (struct regcache
*regcache
)
6614 if (the_low_target
.get_pc
== NULL
)
6617 return (*the_low_target
.get_pc
) (regcache
);
6621 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6623 gdb_assert (the_low_target
.set_pc
!= NULL
);
6625 (*the_low_target
.set_pc
) (regcache
, pc
);
6629 linux_thread_stopped (struct thread_info
*thread
)
6631 return get_thread_lwp (thread
)->stopped
;
6634 /* This exposes stop-all-threads functionality to other modules. */
6637 linux_pause_all (int freeze
)
6639 stop_all_lwps (freeze
, NULL
);
6642 /* This exposes unstop-all-threads functionality to other gdbserver
6646 linux_unpause_all (int unfreeze
)
6648 unstop_all_lwps (unfreeze
, NULL
);
6652 linux_prepare_to_access_memory (void)
6654 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6657 linux_pause_all (1);
6662 linux_done_accessing_memory (void)
6664 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6667 linux_unpause_all (1);
6671 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6672 CORE_ADDR collector
,
6675 CORE_ADDR
*jump_entry
,
6676 CORE_ADDR
*trampoline
,
6677 ULONGEST
*trampoline_size
,
6678 unsigned char *jjump_pad_insn
,
6679 ULONGEST
*jjump_pad_insn_size
,
6680 CORE_ADDR
*adjusted_insn_addr
,
6681 CORE_ADDR
*adjusted_insn_addr_end
,
6684 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6685 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6686 jump_entry
, trampoline
, trampoline_size
,
6687 jjump_pad_insn
, jjump_pad_insn_size
,
6688 adjusted_insn_addr
, adjusted_insn_addr_end
,
6692 static struct emit_ops
*
6693 linux_emit_ops (void)
6695 if (the_low_target
.emit_ops
!= NULL
)
6696 return (*the_low_target
.emit_ops
) ();
6702 linux_get_min_fast_tracepoint_insn_len (void)
6704 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6707 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6710 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6711 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6713 char filename
[PATH_MAX
];
6715 const int auxv_size
= is_elf64
6716 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6717 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6719 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6721 fd
= open (filename
, O_RDONLY
);
6727 while (read (fd
, buf
, auxv_size
) == auxv_size
6728 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6732 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6734 switch (aux
->a_type
)
6737 *phdr_memaddr
= aux
->a_un
.a_val
;
6740 *num_phdr
= aux
->a_un
.a_val
;
6746 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6748 switch (aux
->a_type
)
6751 *phdr_memaddr
= aux
->a_un
.a_val
;
6754 *num_phdr
= aux
->a_un
.a_val
;
6762 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6764 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6765 "phdr_memaddr = %ld, phdr_num = %d",
6766 (long) *phdr_memaddr
, *num_phdr
);
6773 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6776 get_dynamic (const int pid
, const int is_elf64
)
6778 CORE_ADDR phdr_memaddr
, relocation
;
6780 unsigned char *phdr_buf
;
6781 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6783 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6786 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6787 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6789 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6792 /* Compute relocation: it is expected to be 0 for "regular" executables,
6793 non-zero for PIE ones. */
6795 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6798 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6800 if (p
->p_type
== PT_PHDR
)
6801 relocation
= phdr_memaddr
- p
->p_vaddr
;
6805 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6807 if (p
->p_type
== PT_PHDR
)
6808 relocation
= phdr_memaddr
- p
->p_vaddr
;
6811 if (relocation
== -1)
6813 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6814 any real world executables, including PIE executables, have always
6815 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6816 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6817 or present DT_DEBUG anyway (fpc binaries are statically linked).
6819 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6821 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6826 for (i
= 0; i
< num_phdr
; i
++)
6830 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6832 if (p
->p_type
== PT_DYNAMIC
)
6833 return p
->p_vaddr
+ relocation
;
6837 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6839 if (p
->p_type
== PT_DYNAMIC
)
6840 return p
->p_vaddr
+ relocation
;
6847 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6848 can be 0 if the inferior does not yet have the library list initialized.
6849 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6850 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6853 get_r_debug (const int pid
, const int is_elf64
)
6855 CORE_ADDR dynamic_memaddr
;
6856 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6857 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6860 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6861 if (dynamic_memaddr
== 0)
6864 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6868 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6869 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6873 unsigned char buf
[sizeof (Elf64_Xword
)];
6877 #ifdef DT_MIPS_RLD_MAP
6878 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6880 if (linux_read_memory (dyn
->d_un
.d_val
,
6881 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6886 #endif /* DT_MIPS_RLD_MAP */
6887 #ifdef DT_MIPS_RLD_MAP_REL
6888 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6890 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6891 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6896 #endif /* DT_MIPS_RLD_MAP_REL */
6898 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6899 map
= dyn
->d_un
.d_val
;
6901 if (dyn
->d_tag
== DT_NULL
)
6906 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6907 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6911 unsigned char buf
[sizeof (Elf32_Word
)];
6915 #ifdef DT_MIPS_RLD_MAP
6916 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6918 if (linux_read_memory (dyn
->d_un
.d_val
,
6919 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6924 #endif /* DT_MIPS_RLD_MAP */
6925 #ifdef DT_MIPS_RLD_MAP_REL
6926 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6928 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6929 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6934 #endif /* DT_MIPS_RLD_MAP_REL */
6936 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6937 map
= dyn
->d_un
.d_val
;
6939 if (dyn
->d_tag
== DT_NULL
)
6943 dynamic_memaddr
+= dyn_size
;
6949 /* Read one pointer from MEMADDR in the inferior. */
6952 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6956 /* Go through a union so this works on either big or little endian
6957 hosts, when the inferior's pointer size is smaller than the size
6958 of CORE_ADDR. It is assumed the inferior's endianness is the
6959 same of the superior's. */
6962 CORE_ADDR core_addr
;
6967 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6970 if (ptr_size
== sizeof (CORE_ADDR
))
6971 *ptr
= addr
.core_addr
;
6972 else if (ptr_size
== sizeof (unsigned int))
6975 gdb_assert_not_reached ("unhandled pointer size");
6980 struct link_map_offsets
6982 /* Offset and size of r_debug.r_version. */
6983 int r_version_offset
;
6985 /* Offset and size of r_debug.r_map. */
6988 /* Offset to l_addr field in struct link_map. */
6991 /* Offset to l_name field in struct link_map. */
6994 /* Offset to l_ld field in struct link_map. */
6997 /* Offset to l_next field in struct link_map. */
7000 /* Offset to l_prev field in struct link_map. */
7004 /* Construct qXfer:libraries-svr4:read reply. */
7007 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
7008 unsigned const char *writebuf
,
7009 CORE_ADDR offset
, int len
)
7012 unsigned document_len
;
7013 struct process_info_private
*const priv
= current_process ()->priv
;
7014 char filename
[PATH_MAX
];
7017 static const struct link_map_offsets lmo_32bit_offsets
=
7019 0, /* r_version offset. */
7020 4, /* r_debug.r_map offset. */
7021 0, /* l_addr offset in link_map. */
7022 4, /* l_name offset in link_map. */
7023 8, /* l_ld offset in link_map. */
7024 12, /* l_next offset in link_map. */
7025 16 /* l_prev offset in link_map. */
7028 static const struct link_map_offsets lmo_64bit_offsets
=
7030 0, /* r_version offset. */
7031 8, /* r_debug.r_map offset. */
7032 0, /* l_addr offset in link_map. */
7033 8, /* l_name offset in link_map. */
7034 16, /* l_ld offset in link_map. */
7035 24, /* l_next offset in link_map. */
7036 32 /* l_prev offset in link_map. */
7038 const struct link_map_offsets
*lmo
;
7039 unsigned int machine
;
7041 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7042 int allocated
= 1024;
7044 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7045 int header_done
= 0;
7047 if (writebuf
!= NULL
)
7049 if (readbuf
== NULL
)
7052 pid
= lwpid_of (current_thread
);
7053 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7054 is_elf64
= elf_64_file_p (filename
, &machine
);
7055 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7056 ptr_size
= is_elf64
? 8 : 4;
7058 while (annex
[0] != '\0')
7064 sep
= strchr (annex
, '=');
7069 if (len
== 5 && startswith (annex
, "start"))
7071 else if (len
== 4 && startswith (annex
, "prev"))
7075 annex
= strchr (sep
, ';');
7082 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7089 if (priv
->r_debug
== 0)
7090 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7092 /* We failed to find DT_DEBUG. Such situation will not change
7093 for this inferior - do not retry it. Report it to GDB as
7094 E01, see for the reasons at the GDB solib-svr4.c side. */
7095 if (priv
->r_debug
== (CORE_ADDR
) -1)
7098 if (priv
->r_debug
!= 0)
7100 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7101 (unsigned char *) &r_version
,
7102 sizeof (r_version
)) != 0
7105 warning ("unexpected r_debug version %d", r_version
);
7107 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7108 &lm_addr
, ptr_size
) != 0)
7110 warning ("unable to read r_map from 0x%lx",
7111 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7116 document
= (char *) xmalloc (allocated
);
7117 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7118 p
= document
+ strlen (document
);
7121 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7122 &l_name
, ptr_size
) == 0
7123 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7124 &l_addr
, ptr_size
) == 0
7125 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7126 &l_ld
, ptr_size
) == 0
7127 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7128 &l_prev
, ptr_size
) == 0
7129 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7130 &l_next
, ptr_size
) == 0)
7132 unsigned char libname
[PATH_MAX
];
7134 if (lm_prev
!= l_prev
)
7136 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7137 (long) lm_prev
, (long) l_prev
);
7141 /* Ignore the first entry even if it has valid name as the first entry
7142 corresponds to the main executable. The first entry should not be
7143 skipped if the dynamic loader was loaded late by a static executable
7144 (see solib-svr4.c parameter ignore_first). But in such case the main
7145 executable does not have PT_DYNAMIC present and this function already
7146 exited above due to failed get_r_debug. */
7149 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7154 /* Not checking for error because reading may stop before
7155 we've got PATH_MAX worth of characters. */
7157 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7158 libname
[sizeof (libname
) - 1] = '\0';
7159 if (libname
[0] != '\0')
7161 /* 6x the size for xml_escape_text below. */
7162 size_t len
= 6 * strlen ((char *) libname
);
7166 /* Terminate `<library-list-svr4'. */
7171 while (allocated
< p
- document
+ len
+ 200)
7173 /* Expand to guarantee sufficient storage. */
7174 uintptr_t document_len
= p
- document
;
7176 document
= (char *) xrealloc (document
, 2 * allocated
);
7178 p
= document
+ document_len
;
7181 std::string name
= xml_escape_text ((char *) libname
);
7182 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7183 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7184 name
.c_str (), (unsigned long) lm_addr
,
7185 (unsigned long) l_addr
, (unsigned long) l_ld
);
7195 /* Empty list; terminate `<library-list-svr4'. */
7199 strcpy (p
, "</library-list-svr4>");
7201 document_len
= strlen (document
);
7202 if (offset
< document_len
)
7203 document_len
-= offset
;
7206 if (len
> document_len
)
7209 memcpy (readbuf
, document
+ offset
, len
);
7215 #ifdef HAVE_LINUX_BTRACE
7217 /* See to_disable_btrace target method. */
7220 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7222 enum btrace_error err
;
7224 err
= linux_disable_btrace (tinfo
);
7225 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7228 /* Encode an Intel Processor Trace configuration. */
7231 linux_low_encode_pt_config (struct buffer
*buffer
,
7232 const struct btrace_data_pt_config
*config
)
7234 buffer_grow_str (buffer
, "<pt-config>\n");
7236 switch (config
->cpu
.vendor
)
7239 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7240 "model=\"%u\" stepping=\"%u\"/>\n",
7241 config
->cpu
.family
, config
->cpu
.model
,
7242 config
->cpu
.stepping
);
7249 buffer_grow_str (buffer
, "</pt-config>\n");
7252 /* Encode a raw buffer. */
7255 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7261 /* We use hex encoding - see common/rsp-low.h. */
7262 buffer_grow_str (buffer
, "<raw>\n");
7268 elem
[0] = tohex ((*data
>> 4) & 0xf);
7269 elem
[1] = tohex (*data
++ & 0xf);
7271 buffer_grow (buffer
, elem
, 2);
7274 buffer_grow_str (buffer
, "</raw>\n");
7277 /* See to_read_btrace target method. */
7280 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7281 enum btrace_read_type type
)
7283 struct btrace_data btrace
;
7284 struct btrace_block
*block
;
7285 enum btrace_error err
;
7288 btrace_data_init (&btrace
);
7290 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7291 if (err
!= BTRACE_ERR_NONE
)
7293 if (err
== BTRACE_ERR_OVERFLOW
)
7294 buffer_grow_str0 (buffer
, "E.Overflow.");
7296 buffer_grow_str0 (buffer
, "E.Generic Error.");
7301 switch (btrace
.format
)
7303 case BTRACE_FORMAT_NONE
:
7304 buffer_grow_str0 (buffer
, "E.No Trace.");
7307 case BTRACE_FORMAT_BTS
:
7308 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7309 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7312 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7314 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7315 paddress (block
->begin
), paddress (block
->end
));
7317 buffer_grow_str0 (buffer
, "</btrace>\n");
7320 case BTRACE_FORMAT_PT
:
7321 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7322 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7323 buffer_grow_str (buffer
, "<pt>\n");
7325 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7327 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7328 btrace
.variant
.pt
.size
);
7330 buffer_grow_str (buffer
, "</pt>\n");
7331 buffer_grow_str0 (buffer
, "</btrace>\n");
7335 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7339 btrace_data_fini (&btrace
);
7343 btrace_data_fini (&btrace
);
7347 /* See to_btrace_conf target method. */
7350 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7351 struct buffer
*buffer
)
7353 const struct btrace_config
*conf
;
7355 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7356 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7358 conf
= linux_btrace_conf (tinfo
);
7361 switch (conf
->format
)
7363 case BTRACE_FORMAT_NONE
:
7366 case BTRACE_FORMAT_BTS
:
7367 buffer_xml_printf (buffer
, "<bts");
7368 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7369 buffer_xml_printf (buffer
, " />\n");
7372 case BTRACE_FORMAT_PT
:
7373 buffer_xml_printf (buffer
, "<pt");
7374 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7375 buffer_xml_printf (buffer
, "/>\n");
7380 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7383 #endif /* HAVE_LINUX_BTRACE */
7385 /* See nat/linux-nat.h. */
7388 current_lwp_ptid (void)
7390 return ptid_of (current_thread
);
7393 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7396 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7398 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7399 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7401 return default_breakpoint_kind_from_pc (pcptr
);
7404 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7406 static const gdb_byte
*
7407 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7409 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7411 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7414 /* Implementation of the target_ops method
7415 "breakpoint_kind_from_current_state". */
7418 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7420 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7421 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7423 return linux_breakpoint_kind_from_pc (pcptr
);
7426 /* Default implementation of linux_target_ops method "set_pc" for
7427 32-bit pc register which is literally named "pc". */
7430 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7432 uint32_t newpc
= pc
;
7434 supply_register_by_name (regcache
, "pc", &newpc
);
7437 /* Default implementation of linux_target_ops method "get_pc" for
7438 32-bit pc register which is literally named "pc". */
7441 linux_get_pc_32bit (struct regcache
*regcache
)
7445 collect_register_by_name (regcache
, "pc", &pc
);
7447 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7451 /* Default implementation of linux_target_ops method "set_pc" for
7452 64-bit pc register which is literally named "pc". */
7455 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7457 uint64_t newpc
= pc
;
7459 supply_register_by_name (regcache
, "pc", &newpc
);
7462 /* Default implementation of linux_target_ops method "get_pc" for
7463 64-bit pc register which is literally named "pc". */
7466 linux_get_pc_64bit (struct regcache
*regcache
)
7470 collect_register_by_name (regcache
, "pc", &pc
);
7472 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7477 static struct target_ops linux_target_ops
= {
7478 linux_create_inferior
,
7479 linux_post_create_inferior
,
7488 linux_fetch_registers
,
7489 linux_store_registers
,
7490 linux_prepare_to_access_memory
,
7491 linux_done_accessing_memory
,
7494 linux_look_up_symbols
,
7495 linux_request_interrupt
,
7497 linux_supports_z_point_type
,
7500 linux_stopped_by_sw_breakpoint
,
7501 linux_supports_stopped_by_sw_breakpoint
,
7502 linux_stopped_by_hw_breakpoint
,
7503 linux_supports_stopped_by_hw_breakpoint
,
7504 linux_supports_hardware_single_step
,
7505 linux_stopped_by_watchpoint
,
7506 linux_stopped_data_address
,
7507 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7508 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7509 && defined(PT_TEXT_END_ADDR)
7514 #ifdef USE_THREAD_DB
7515 thread_db_get_tls_address
,
7520 hostio_last_error_from_errno
,
7523 linux_supports_non_stop
,
7525 linux_start_non_stop
,
7526 linux_supports_multi_process
,
7527 linux_supports_fork_events
,
7528 linux_supports_vfork_events
,
7529 linux_supports_exec_events
,
7530 linux_handle_new_gdb_connection
,
7531 #ifdef USE_THREAD_DB
7532 thread_db_handle_monitor_command
,
7536 linux_common_core_of_thread
,
7538 linux_process_qsupported
,
7539 linux_supports_tracepoints
,
7542 linux_thread_stopped
,
7546 linux_stabilize_threads
,
7547 linux_install_fast_tracepoint_jump_pad
,
7549 linux_supports_disable_randomization
,
7550 linux_get_min_fast_tracepoint_insn_len
,
7551 linux_qxfer_libraries_svr4
,
7552 linux_supports_agent
,
7553 #ifdef HAVE_LINUX_BTRACE
7554 linux_supports_btrace
,
7555 linux_enable_btrace
,
7556 linux_low_disable_btrace
,
7557 linux_low_read_btrace
,
7558 linux_low_btrace_conf
,
7566 linux_supports_range_stepping
,
7567 linux_proc_pid_to_exec_file
,
7568 linux_mntns_open_cloexec
,
7570 linux_mntns_readlink
,
7571 linux_breakpoint_kind_from_pc
,
7572 linux_sw_breakpoint_from_kind
,
7573 linux_proc_tid_get_name
,
7574 linux_breakpoint_kind_from_current_state
,
7575 linux_supports_software_single_step
,
7576 linux_supports_catch_syscall
,
7577 linux_get_ipa_tdesc_idx
,
7579 thread_db_thread_handle
,
7585 #ifdef HAVE_LINUX_REGSETS
7587 initialize_regsets_info (struct regsets_info
*info
)
7589 for (info
->num_regsets
= 0;
7590 info
->regsets
[info
->num_regsets
].size
>= 0;
7591 info
->num_regsets
++)
7597 initialize_low (void)
7599 struct sigaction sigchld_action
;
7601 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7602 set_target_ops (&linux_target_ops
);
7604 linux_ptrace_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 ();