1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2017 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "linux-low.h"
21 #include "nat/linux-osdata.h"
25 #include "signals-state-save-restore.h"
26 #include "nat/linux-nat.h"
27 #include "nat/linux-waitpid.h"
29 #include "nat/gdb_ptrace.h"
30 #include "nat/linux-ptrace.h"
31 #include "nat/linux-procfs.h"
32 #include "nat/linux-personality.h"
34 #include <sys/ioctl.h>
37 #include <sys/syscall.h>
41 #include <sys/types.h>
46 #include "filestuff.h"
47 #include "tracepoint.h"
50 #include "common-inferior.h"
51 #include "nat/fork-inferior.h"
54 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
55 then ELFMAG0 will have been defined. If it didn't get included by
56 gdb_proc_service.h then including it will likely introduce a duplicate
57 definition of elf_fpregset_t. */
60 #include "nat/linux-namespaces.h"
63 #define SPUFS_MAGIC 0x23c9b64e
66 #ifdef HAVE_PERSONALITY
67 # include <sys/personality.h>
68 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
69 # define ADDR_NO_RANDOMIZE 0x0040000
77 /* Some targets did not define these ptrace constants from the start,
78 so gdbserver defines them locally here. In the future, these may
79 be removed after they are added to asm/ptrace.h. */
80 #if !(defined(PT_TEXT_ADDR) \
81 || defined(PT_DATA_ADDR) \
82 || defined(PT_TEXT_END_ADDR))
83 #if defined(__mcoldfire__)
84 /* These are still undefined in 3.10 kernels. */
85 #define PT_TEXT_ADDR 49*4
86 #define PT_DATA_ADDR 50*4
87 #define PT_TEXT_END_ADDR 51*4
88 /* BFIN already defines these since at least 2.6.32 kernels. */
90 #define PT_TEXT_ADDR 220
91 #define PT_TEXT_END_ADDR 224
92 #define PT_DATA_ADDR 228
93 /* These are still undefined in 3.10 kernels. */
94 #elif defined(__TMS320C6X__)
95 #define PT_TEXT_ADDR (0x10000*4)
96 #define PT_DATA_ADDR (0x10004*4)
97 #define PT_TEXT_END_ADDR (0x10008*4)
101 #ifdef HAVE_LINUX_BTRACE
102 # include "nat/linux-btrace.h"
103 # include "btrace-common.h"
106 #ifndef HAVE_ELF32_AUXV_T
107 /* Copied from glibc's elf.h. */
110 uint32_t a_type
; /* Entry type */
113 uint32_t a_val
; /* Integer value */
114 /* We use to have pointer elements added here. We cannot do that,
115 though, since it does not work when using 32-bit definitions
116 on 64-bit platforms and vice versa. */
121 #ifndef HAVE_ELF64_AUXV_T
122 /* Copied from glibc's elf.h. */
125 uint64_t a_type
; /* Entry type */
128 uint64_t a_val
; /* Integer value */
129 /* We use to have pointer elements added here. We cannot do that,
130 though, since it does not work when using 32-bit definitions
131 on 64-bit platforms and vice versa. */
136 /* Does the current host support PTRACE_GETREGSET? */
137 int have_ptrace_getregset
= -1;
141 /* See nat/linux-nat.h. */
144 ptid_of_lwp (struct lwp_info
*lwp
)
146 return ptid_of (get_lwp_thread (lwp
));
149 /* See nat/linux-nat.h. */
152 lwp_set_arch_private_info (struct lwp_info
*lwp
,
153 struct arch_lwp_info
*info
)
155 lwp
->arch_private
= info
;
158 /* See nat/linux-nat.h. */
160 struct arch_lwp_info
*
161 lwp_arch_private_info (struct lwp_info
*lwp
)
163 return lwp
->arch_private
;
166 /* See nat/linux-nat.h. */
169 lwp_is_stopped (struct lwp_info
*lwp
)
174 /* See nat/linux-nat.h. */
176 enum target_stop_reason
177 lwp_stop_reason (struct lwp_info
*lwp
)
179 return lwp
->stop_reason
;
182 /* See nat/linux-nat.h. */
185 lwp_is_stepping (struct lwp_info
*lwp
)
187 return lwp
->stepping
;
190 /* A list of all unknown processes which receive stop signals. Some
191 other process will presumably claim each of these as forked
192 children momentarily. */
194 struct simple_pid_list
196 /* The process ID. */
199 /* The status as reported by waitpid. */
203 struct simple_pid_list
*next
;
205 struct simple_pid_list
*stopped_pids
;
207 /* Trivial list manipulation functions to keep track of a list of new
208 stopped processes. */
211 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
213 struct simple_pid_list
*new_pid
= XNEW (struct simple_pid_list
);
216 new_pid
->status
= status
;
217 new_pid
->next
= *listp
;
222 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
224 struct simple_pid_list
**p
;
226 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
227 if ((*p
)->pid
== pid
)
229 struct simple_pid_list
*next
= (*p
)->next
;
231 *statusp
= (*p
)->status
;
239 enum stopping_threads_kind
241 /* Not stopping threads presently. */
242 NOT_STOPPING_THREADS
,
244 /* Stopping threads. */
247 /* Stopping and suspending threads. */
248 STOPPING_AND_SUSPENDING_THREADS
251 /* This is set while stop_all_lwps is in effect. */
252 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
254 /* FIXME make into a target method? */
255 int using_threads
= 1;
257 /* True if we're presently stabilizing threads (moving them out of
259 static int stabilizing_threads
;
261 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
262 int step
, int signal
, siginfo_t
*info
);
263 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
264 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
265 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
266 static void unsuspend_all_lwps (struct lwp_info
*except
);
267 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
268 int *wstat
, int options
);
269 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
270 static struct lwp_info
*add_lwp (ptid_t ptid
);
271 static void linux_mourn (struct process_info
*process
);
272 static int linux_stopped_by_watchpoint (void);
273 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
274 static int lwp_is_marked_dead (struct lwp_info
*lwp
);
275 static void proceed_all_lwps (void);
276 static int finish_step_over (struct lwp_info
*lwp
);
277 static int kill_lwp (unsigned long lwpid
, int signo
);
278 static void enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
);
279 static void complete_ongoing_step_over (void);
280 static int linux_low_ptrace_options (int attached
);
281 static int check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
);
282 static int proceed_one_lwp (thread_info
*thread
, void *except
);
284 /* When the event-loop is doing a step-over, this points at the thread
286 ptid_t step_over_bkpt
;
288 /* True if the low target can hardware single-step. */
291 can_hardware_single_step (void)
293 if (the_low_target
.supports_hardware_single_step
!= NULL
)
294 return the_low_target
.supports_hardware_single_step ();
299 /* True if the low target can software single-step. Such targets
300 implement the GET_NEXT_PCS callback. */
303 can_software_single_step (void)
305 return (the_low_target
.get_next_pcs
!= NULL
);
308 /* True if the low target supports memory breakpoints. If so, we'll
309 have a GET_PC implementation. */
312 supports_breakpoints (void)
314 return (the_low_target
.get_pc
!= NULL
);
317 /* Returns true if this target can support fast tracepoints. This
318 does not mean that the in-process agent has been loaded in the
322 supports_fast_tracepoints (void)
324 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
327 /* True if LWP is stopped in its stepping range. */
330 lwp_in_step_range (struct lwp_info
*lwp
)
332 CORE_ADDR pc
= lwp
->stop_pc
;
334 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
337 struct pending_signals
341 struct pending_signals
*prev
;
344 /* The read/write ends of the pipe registered as waitable file in the
346 static int linux_event_pipe
[2] = { -1, -1 };
348 /* True if we're currently in async mode. */
349 #define target_is_async_p() (linux_event_pipe[0] != -1)
351 static void send_sigstop (struct lwp_info
*lwp
);
352 static void wait_for_sigstop (void);
354 /* Return non-zero if HEADER is a 64-bit ELF file. */
357 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
359 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
360 && header
->e_ident
[EI_MAG1
] == ELFMAG1
361 && header
->e_ident
[EI_MAG2
] == ELFMAG2
362 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
364 *machine
= header
->e_machine
;
365 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
372 /* Return non-zero if FILE is a 64-bit ELF file,
373 zero if the file is not a 64-bit ELF file,
374 and -1 if the file is not accessible or doesn't exist. */
377 elf_64_file_p (const char *file
, unsigned int *machine
)
382 fd
= open (file
, O_RDONLY
);
386 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
393 return elf_64_header_p (&header
, machine
);
396 /* Accepts an integer PID; Returns true if the executable PID is
397 running is a 64-bit ELF file.. */
400 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
404 sprintf (file
, "/proc/%d/exe", pid
);
405 return elf_64_file_p (file
, machine
);
409 delete_lwp (struct lwp_info
*lwp
)
411 struct thread_info
*thr
= get_lwp_thread (lwp
);
414 debug_printf ("deleting %ld\n", lwpid_of (thr
));
418 if (the_low_target
.delete_thread
!= NULL
)
419 the_low_target
.delete_thread (lwp
->arch_private
);
421 gdb_assert (lwp
->arch_private
== NULL
);
426 /* Add a process to the common process list, and set its private
429 static struct process_info
*
430 linux_add_process (int pid
, int attached
)
432 struct process_info
*proc
;
434 proc
= add_process (pid
, attached
);
435 proc
->priv
= XCNEW (struct process_info_private
);
437 if (the_low_target
.new_process
!= NULL
)
438 proc
->priv
->arch_private
= the_low_target
.new_process ();
443 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
445 /* Call the target arch_setup function on the current thread. */
448 linux_arch_setup (void)
450 the_low_target
.arch_setup ();
453 /* Call the target arch_setup function on THREAD. */
456 linux_arch_setup_thread (struct thread_info
*thread
)
458 struct thread_info
*saved_thread
;
460 saved_thread
= current_thread
;
461 current_thread
= thread
;
465 current_thread
= saved_thread
;
468 /* Handle a GNU/Linux extended wait response. If we see a clone,
469 fork, or vfork event, we need to add the new LWP to our list
470 (and return 0 so as not to report the trap to higher layers).
471 If we see an exec event, we will modify ORIG_EVENT_LWP to point
472 to a new LWP representing the new program. */
475 handle_extended_wait (struct lwp_info
**orig_event_lwp
, int wstat
)
477 struct lwp_info
*event_lwp
= *orig_event_lwp
;
478 int event
= linux_ptrace_get_extended_event (wstat
);
479 struct thread_info
*event_thr
= get_lwp_thread (event_lwp
);
480 struct lwp_info
*new_lwp
;
482 gdb_assert (event_lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
484 /* All extended events we currently use are mid-syscall. Only
485 PTRACE_EVENT_STOP is delivered more like a signal-stop, but
486 you have to be using PTRACE_SEIZE to get that. */
487 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
489 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
490 || (event
== PTRACE_EVENT_CLONE
))
493 unsigned long new_pid
;
496 /* Get the pid of the new lwp. */
497 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
500 /* If we haven't already seen the new PID stop, wait for it now. */
501 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
503 /* The new child has a pending SIGSTOP. We can't affect it until it
504 hits the SIGSTOP, but we're already attached. */
506 ret
= my_waitpid (new_pid
, &status
, __WALL
);
509 perror_with_name ("waiting for new child");
510 else if (ret
!= new_pid
)
511 warning ("wait returned unexpected PID %d", ret
);
512 else if (!WIFSTOPPED (status
))
513 warning ("wait returned unexpected status 0x%x", status
);
516 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
518 struct process_info
*parent_proc
;
519 struct process_info
*child_proc
;
520 struct lwp_info
*child_lwp
;
521 struct thread_info
*child_thr
;
522 struct target_desc
*tdesc
;
524 ptid
= ptid_build (new_pid
, new_pid
, 0);
528 debug_printf ("HEW: Got fork event from LWP %ld, "
530 ptid_get_lwp (ptid_of (event_thr
)),
531 ptid_get_pid (ptid
));
534 /* Add the new process to the tables and clone the breakpoint
535 lists of the parent. We need to do this even if the new process
536 will be detached, since we will need the process object and the
537 breakpoints to remove any breakpoints from memory when we
538 detach, and the client side will access registers. */
539 child_proc
= linux_add_process (new_pid
, 0);
540 gdb_assert (child_proc
!= NULL
);
541 child_lwp
= add_lwp (ptid
);
542 gdb_assert (child_lwp
!= NULL
);
543 child_lwp
->stopped
= 1;
544 child_lwp
->must_set_ptrace_flags
= 1;
545 child_lwp
->status_pending_p
= 0;
546 child_thr
= get_lwp_thread (child_lwp
);
547 child_thr
->last_resume_kind
= resume_stop
;
548 child_thr
->last_status
.kind
= TARGET_WAITKIND_STOPPED
;
550 /* If we're suspending all threads, leave this one suspended
551 too. If the fork/clone parent is stepping over a breakpoint,
552 all other threads have been suspended already. Leave the
553 child suspended too. */
554 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
555 || event_lwp
->bp_reinsert
!= 0)
558 debug_printf ("HEW: leaving child suspended\n");
559 child_lwp
->suspended
= 1;
562 parent_proc
= get_thread_process (event_thr
);
563 child_proc
->attached
= parent_proc
->attached
;
565 if (event_lwp
->bp_reinsert
!= 0
566 && can_software_single_step ()
567 && event
== PTRACE_EVENT_VFORK
)
569 /* If we leave single-step breakpoints there, child will
570 hit it, so uninsert single-step breakpoints from parent
571 (and child). Once vfork child is done, reinsert
572 them back to parent. */
573 uninsert_single_step_breakpoints (event_thr
);
576 clone_all_breakpoints (child_thr
, event_thr
);
578 tdesc
= allocate_target_description ();
579 copy_target_description (tdesc
, parent_proc
->tdesc
);
580 child_proc
->tdesc
= tdesc
;
582 /* Clone arch-specific process data. */
583 if (the_low_target
.new_fork
!= NULL
)
584 the_low_target
.new_fork (parent_proc
, child_proc
);
586 /* Save fork info in the parent thread. */
587 if (event
== PTRACE_EVENT_FORK
)
588 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
589 else if (event
== PTRACE_EVENT_VFORK
)
590 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
592 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
594 /* The status_pending field contains bits denoting the
595 extended event, so when the pending event is handled,
596 the handler will look at lwp->waitstatus. */
597 event_lwp
->status_pending_p
= 1;
598 event_lwp
->status_pending
= wstat
;
600 /* Link the threads until the parent event is passed on to
602 event_lwp
->fork_relative
= child_lwp
;
603 child_lwp
->fork_relative
= event_lwp
;
605 /* If the parent thread is doing step-over with single-step
606 breakpoints, the list of single-step breakpoints are cloned
607 from the parent's. Remove them from the child process.
608 In case of vfork, we'll reinsert them back once vforked
610 if (event_lwp
->bp_reinsert
!= 0
611 && can_software_single_step ())
613 /* The child process is forked and stopped, so it is safe
614 to access its memory without stopping all other threads
615 from other processes. */
616 delete_single_step_breakpoints (child_thr
);
618 gdb_assert (has_single_step_breakpoints (event_thr
));
619 gdb_assert (!has_single_step_breakpoints (child_thr
));
622 /* Report the event. */
627 debug_printf ("HEW: Got clone event "
628 "from LWP %ld, new child is LWP %ld\n",
629 lwpid_of (event_thr
), new_pid
);
631 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
632 new_lwp
= add_lwp (ptid
);
634 /* Either we're going to immediately resume the new thread
635 or leave it stopped. linux_resume_one_lwp is a nop if it
636 thinks the thread is currently running, so set this first
637 before calling linux_resume_one_lwp. */
638 new_lwp
->stopped
= 1;
640 /* If we're suspending all threads, leave this one suspended
641 too. If the fork/clone parent is stepping over a breakpoint,
642 all other threads have been suspended already. Leave the
643 child suspended too. */
644 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
645 || event_lwp
->bp_reinsert
!= 0)
646 new_lwp
->suspended
= 1;
648 /* Normally we will get the pending SIGSTOP. But in some cases
649 we might get another signal delivered to the group first.
650 If we do get another signal, be sure not to lose it. */
651 if (WSTOPSIG (status
) != SIGSTOP
)
653 new_lwp
->stop_expected
= 1;
654 new_lwp
->status_pending_p
= 1;
655 new_lwp
->status_pending
= status
;
657 else if (report_thread_events
)
659 new_lwp
->waitstatus
.kind
= TARGET_WAITKIND_THREAD_CREATED
;
660 new_lwp
->status_pending_p
= 1;
661 new_lwp
->status_pending
= status
;
664 thread_db_notice_clone (event_thr
, ptid
);
666 /* Don't report the event. */
669 else if (event
== PTRACE_EVENT_VFORK_DONE
)
671 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
673 if (event_lwp
->bp_reinsert
!= 0 && can_software_single_step ())
675 reinsert_single_step_breakpoints (event_thr
);
677 gdb_assert (has_single_step_breakpoints (event_thr
));
680 /* Report the event. */
683 else if (event
== PTRACE_EVENT_EXEC
&& report_exec_events
)
685 struct process_info
*proc
;
686 std::vector
<int> syscalls_to_catch
;
692 debug_printf ("HEW: Got exec event from LWP %ld\n",
693 lwpid_of (event_thr
));
696 /* Get the event ptid. */
697 event_ptid
= ptid_of (event_thr
);
698 event_pid
= ptid_get_pid (event_ptid
);
700 /* Save the syscall list from the execing process. */
701 proc
= get_thread_process (event_thr
);
702 syscalls_to_catch
= std::move (proc
->syscalls_to_catch
);
704 /* Delete the execing process and all its threads. */
706 current_thread
= NULL
;
708 /* Create a new process/lwp/thread. */
709 proc
= linux_add_process (event_pid
, 0);
710 event_lwp
= add_lwp (event_ptid
);
711 event_thr
= get_lwp_thread (event_lwp
);
712 gdb_assert (current_thread
== event_thr
);
713 linux_arch_setup_thread (event_thr
);
715 /* Set the event status. */
716 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
717 event_lwp
->waitstatus
.value
.execd_pathname
718 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
720 /* Mark the exec status as pending. */
721 event_lwp
->stopped
= 1;
722 event_lwp
->status_pending_p
= 1;
723 event_lwp
->status_pending
= wstat
;
724 event_thr
->last_resume_kind
= resume_continue
;
725 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
727 /* Update syscall state in the new lwp, effectively mid-syscall too. */
728 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
730 /* Restore the list to catch. Don't rely on the client, which is free
731 to avoid sending a new list when the architecture doesn't change.
732 Also, for ANY_SYSCALL, the architecture doesn't really matter. */
733 proc
->syscalls_to_catch
= std::move (syscalls_to_catch
);
735 /* Report the event. */
736 *orig_event_lwp
= event_lwp
;
740 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
743 /* Return the PC as read from the regcache of LWP, without any
747 get_pc (struct lwp_info
*lwp
)
749 struct thread_info
*saved_thread
;
750 struct regcache
*regcache
;
753 if (the_low_target
.get_pc
== NULL
)
756 saved_thread
= current_thread
;
757 current_thread
= get_lwp_thread (lwp
);
759 regcache
= get_thread_regcache (current_thread
, 1);
760 pc
= (*the_low_target
.get_pc
) (regcache
);
763 debug_printf ("pc is 0x%lx\n", (long) pc
);
765 current_thread
= saved_thread
;
769 /* This function should only be called if LWP got a SYSCALL_SIGTRAP.
770 Fill *SYSNO with the syscall nr trapped. */
773 get_syscall_trapinfo (struct lwp_info
*lwp
, int *sysno
)
775 struct thread_info
*saved_thread
;
776 struct regcache
*regcache
;
778 if (the_low_target
.get_syscall_trapinfo
== NULL
)
780 /* If we cannot get the syscall trapinfo, report an unknown
781 system call number. */
782 *sysno
= UNKNOWN_SYSCALL
;
786 saved_thread
= current_thread
;
787 current_thread
= get_lwp_thread (lwp
);
789 regcache
= get_thread_regcache (current_thread
, 1);
790 (*the_low_target
.get_syscall_trapinfo
) (regcache
, sysno
);
793 debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno
);
795 current_thread
= saved_thread
;
798 static int check_stopped_by_watchpoint (struct lwp_info
*child
);
800 /* Called when the LWP stopped for a signal/trap. If it stopped for a
801 trap check what caused it (breakpoint, watchpoint, trace, etc.),
802 and save the result in the LWP's stop_reason field. If it stopped
803 for a breakpoint, decrement the PC if necessary on the lwp's
804 architecture. Returns true if we now have the LWP's stop PC. */
807 save_stop_reason (struct lwp_info
*lwp
)
810 CORE_ADDR sw_breakpoint_pc
;
811 struct thread_info
*saved_thread
;
812 #if USE_SIGTRAP_SIGINFO
816 if (the_low_target
.get_pc
== NULL
)
820 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
822 /* breakpoint_at reads from the current thread. */
823 saved_thread
= current_thread
;
824 current_thread
= get_lwp_thread (lwp
);
826 #if USE_SIGTRAP_SIGINFO
827 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
828 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
830 if (siginfo
.si_signo
== SIGTRAP
)
832 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
)
833 && GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
835 /* The si_code is ambiguous on this arch -- check debug
837 if (!check_stopped_by_watchpoint (lwp
))
838 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
840 else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
842 /* If we determine the LWP stopped for a SW breakpoint,
843 trust it. Particularly don't check watchpoint
844 registers, because at least on s390, we'd find
845 stopped-by-watchpoint as long as there's a watchpoint
847 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
849 else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
851 /* This can indicate either a hardware breakpoint or
852 hardware watchpoint. Check debug registers. */
853 if (!check_stopped_by_watchpoint (lwp
))
854 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
856 else if (siginfo
.si_code
== TRAP_TRACE
)
858 /* We may have single stepped an instruction that
859 triggered a watchpoint. In that case, on some
860 architectures (such as x86), instead of TRAP_HWBKPT,
861 si_code indicates TRAP_TRACE, and we need to check
862 the debug registers separately. */
863 if (!check_stopped_by_watchpoint (lwp
))
864 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
869 /* We may have just stepped a breakpoint instruction. E.g., in
870 non-stop mode, GDB first tells the thread A to step a range, and
871 then the user inserts a breakpoint inside the range. In that
872 case we need to report the breakpoint PC. */
873 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
874 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
875 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
877 if (hardware_breakpoint_inserted_here (pc
))
878 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
880 if (lwp
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
)
881 check_stopped_by_watchpoint (lwp
);
884 if (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
888 struct thread_info
*thr
= get_lwp_thread (lwp
);
890 debug_printf ("CSBB: %s stopped by software breakpoint\n",
891 target_pid_to_str (ptid_of (thr
)));
894 /* Back up the PC if necessary. */
895 if (pc
!= sw_breakpoint_pc
)
897 struct regcache
*regcache
898 = get_thread_regcache (current_thread
, 1);
899 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
902 /* Update this so we record the correct stop PC below. */
903 pc
= sw_breakpoint_pc
;
905 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
)
909 struct thread_info
*thr
= get_lwp_thread (lwp
);
911 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
912 target_pid_to_str (ptid_of (thr
)));
915 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
919 struct thread_info
*thr
= get_lwp_thread (lwp
);
921 debug_printf ("CSBB: %s stopped by hardware watchpoint\n",
922 target_pid_to_str (ptid_of (thr
)));
925 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
)
929 struct thread_info
*thr
= get_lwp_thread (lwp
);
931 debug_printf ("CSBB: %s stopped by trace\n",
932 target_pid_to_str (ptid_of (thr
)));
937 current_thread
= saved_thread
;
941 static struct lwp_info
*
942 add_lwp (ptid_t ptid
)
944 struct lwp_info
*lwp
;
946 lwp
= XCNEW (struct lwp_info
);
948 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
950 if (the_low_target
.new_thread
!= NULL
)
951 the_low_target
.new_thread (lwp
);
953 lwp
->thread
= add_thread (ptid
, lwp
);
958 /* Callback to be used when calling fork_inferior, responsible for
959 actually initiating the tracing of the inferior. */
964 if (ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0,
965 (PTRACE_TYPE_ARG4
) 0) < 0)
966 trace_start_error_with_name ("ptrace");
968 if (setpgid (0, 0) < 0)
969 trace_start_error_with_name ("setpgid");
971 /* If GDBserver is connected to gdb via stdio, redirect the inferior's
972 stdout to stderr so that inferior i/o doesn't corrupt the connection.
973 Also, redirect stdin to /dev/null. */
974 if (remote_connection_is_stdio ())
977 trace_start_error_with_name ("close");
978 if (open ("/dev/null", O_RDONLY
) < 0)
979 trace_start_error_with_name ("open");
981 trace_start_error_with_name ("dup2");
982 if (write (2, "stdin/stdout redirected\n",
983 sizeof ("stdin/stdout redirected\n") - 1) < 0)
985 /* Errors ignored. */;
990 /* Start an inferior process and returns its pid.
991 PROGRAM is the name of the program to be started, and PROGRAM_ARGS
992 are its arguments. */
995 linux_create_inferior (const char *program
,
996 const std::vector
<char *> &program_args
)
998 struct lwp_info
*new_lwp
;
1001 struct cleanup
*restore_personality
1002 = maybe_disable_address_space_randomization (disable_randomization
);
1003 std::string str_program_args
= stringify_argv (program_args
);
1005 pid
= fork_inferior (program
,
1006 str_program_args
.c_str (),
1007 get_environ ()->envp (), linux_ptrace_fun
,
1008 NULL
, NULL
, NULL
, NULL
);
1010 do_cleanups (restore_personality
);
1012 linux_add_process (pid
, 0);
1014 ptid
= ptid_build (pid
, pid
, 0);
1015 new_lwp
= add_lwp (ptid
);
1016 new_lwp
->must_set_ptrace_flags
= 1;
1018 post_fork_inferior (pid
, program
);
1023 /* Implement the post_create_inferior target_ops method. */
1026 linux_post_create_inferior (void)
1028 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
1030 linux_arch_setup ();
1032 if (lwp
->must_set_ptrace_flags
)
1034 struct process_info
*proc
= current_process ();
1035 int options
= linux_low_ptrace_options (proc
->attached
);
1037 linux_enable_event_reporting (lwpid_of (current_thread
), options
);
1038 lwp
->must_set_ptrace_flags
= 0;
1042 /* Attach to an inferior process. Returns 0 on success, ERRNO on
1046 linux_attach_lwp (ptid_t ptid
)
1048 struct lwp_info
*new_lwp
;
1049 int lwpid
= ptid_get_lwp (ptid
);
1051 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
1055 new_lwp
= add_lwp (ptid
);
1057 /* We need to wait for SIGSTOP before being able to make the next
1058 ptrace call on this LWP. */
1059 new_lwp
->must_set_ptrace_flags
= 1;
1061 if (linux_proc_pid_is_stopped (lwpid
))
1064 debug_printf ("Attached to a stopped process\n");
1066 /* The process is definitely stopped. It is in a job control
1067 stop, unless the kernel predates the TASK_STOPPED /
1068 TASK_TRACED distinction, in which case it might be in a
1069 ptrace stop. Make sure it is in a ptrace stop; from there we
1070 can kill it, signal it, et cetera.
1072 First make sure there is a pending SIGSTOP. Since we are
1073 already attached, the process can not transition from stopped
1074 to running without a PTRACE_CONT; so we know this signal will
1075 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1076 probably already in the queue (unless this kernel is old
1077 enough to use TASK_STOPPED for ptrace stops); but since
1078 SIGSTOP is not an RT signal, it can only be queued once. */
1079 kill_lwp (lwpid
, SIGSTOP
);
1081 /* Finally, resume the stopped process. This will deliver the
1082 SIGSTOP (or a higher priority signal, just like normal
1083 PTRACE_ATTACH), which we'll catch later on. */
1084 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1087 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
1088 brings it to a halt.
1090 There are several cases to consider here:
1092 1) gdbserver has already attached to the process and is being notified
1093 of a new thread that is being created.
1094 In this case we should ignore that SIGSTOP and resume the
1095 process. This is handled below by setting stop_expected = 1,
1096 and the fact that add_thread sets last_resume_kind ==
1099 2) This is the first thread (the process thread), and we're attaching
1100 to it via attach_inferior.
1101 In this case we want the process thread to stop.
1102 This is handled by having linux_attach set last_resume_kind ==
1103 resume_stop after we return.
1105 If the pid we are attaching to is also the tgid, we attach to and
1106 stop all the existing threads. Otherwise, we attach to pid and
1107 ignore any other threads in the same group as this pid.
1109 3) GDB is connecting to gdbserver and is requesting an enumeration of all
1111 In this case we want the thread to stop.
1112 FIXME: This case is currently not properly handled.
1113 We should wait for the SIGSTOP but don't. Things work apparently
1114 because enough time passes between when we ptrace (ATTACH) and when
1115 gdb makes the next ptrace call on the thread.
1117 On the other hand, if we are currently trying to stop all threads, we
1118 should treat the new thread as if we had sent it a SIGSTOP. This works
1119 because we are guaranteed that the add_lwp call above added us to the
1120 end of the list, and so the new thread has not yet reached
1121 wait_for_sigstop (but will). */
1122 new_lwp
->stop_expected
= 1;
1127 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
1128 already attached. Returns true if a new LWP is found, false
1132 attach_proc_task_lwp_callback (ptid_t ptid
)
1134 /* Is this a new thread? */
1135 if (find_thread_ptid (ptid
) == NULL
)
1137 int lwpid
= ptid_get_lwp (ptid
);
1141 debug_printf ("Found new lwp %d\n", lwpid
);
1143 err
= linux_attach_lwp (ptid
);
1145 /* Be quiet if we simply raced with the thread exiting. EPERM
1146 is returned if the thread's task still exists, and is marked
1147 as exited or zombie, as well as other conditions, so in that
1148 case, confirm the status in /proc/PID/status. */
1150 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1154 debug_printf ("Cannot attach to lwp %d: "
1155 "thread is gone (%d: %s)\n",
1156 lwpid
, err
, strerror (err
));
1161 warning (_("Cannot attach to lwp %d: %s"),
1163 linux_ptrace_attach_fail_reason_string (ptid
, err
));
1171 static void async_file_mark (void);
1173 /* Attach to PID. If PID is the tgid, attach to it and all
1177 linux_attach (unsigned long pid
)
1179 struct process_info
*proc
;
1180 struct thread_info
*initial_thread
;
1181 ptid_t ptid
= ptid_build (pid
, pid
, 0);
1184 /* Attach to PID. We will check for other threads
1186 err
= linux_attach_lwp (ptid
);
1188 error ("Cannot attach to process %ld: %s",
1189 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
1191 proc
= linux_add_process (pid
, 1);
1193 /* Don't ignore the initial SIGSTOP if we just attached to this
1194 process. It will be collected by wait shortly. */
1195 initial_thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
1196 initial_thread
->last_resume_kind
= resume_stop
;
1198 /* We must attach to every LWP. If /proc is mounted, use that to
1199 find them now. On the one hand, the inferior may be using raw
1200 clone instead of using pthreads. On the other hand, even if it
1201 is using pthreads, GDB may not be connected yet (thread_db needs
1202 to do symbol lookups, through qSymbol). Also, thread_db walks
1203 structures in the inferior's address space to find the list of
1204 threads/LWPs, and those structures may well be corrupted. Note
1205 that once thread_db is loaded, we'll still use it to list threads
1206 and associate pthread info with each LWP. */
1207 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1209 /* GDB will shortly read the xml target description for this
1210 process, to figure out the process' architecture. But the target
1211 description is only filled in when the first process/thread in
1212 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1213 that now, otherwise, if GDB is fast enough, it could read the
1214 target description _before_ that initial stop. */
1217 struct lwp_info
*lwp
;
1219 ptid_t pid_ptid
= pid_to_ptid (pid
);
1221 lwpid
= linux_wait_for_event_filtered (pid_ptid
, pid_ptid
,
1223 gdb_assert (lwpid
> 0);
1225 lwp
= find_lwp_pid (pid_to_ptid (lwpid
));
1227 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGSTOP
)
1229 lwp
->status_pending_p
= 1;
1230 lwp
->status_pending
= wstat
;
1233 initial_thread
->last_resume_kind
= resume_continue
;
1237 gdb_assert (proc
->tdesc
!= NULL
);
1250 second_thread_of_pid_p (thread_info
*thread
, void *args
)
1252 struct counter
*counter
= (struct counter
*) args
;
1254 if (thread
->id
.pid () == counter
->pid
)
1256 if (++counter
->count
> 1)
1264 last_thread_of_process_p (int pid
)
1266 struct counter counter
= { pid
, 0 };
1268 return (find_inferior (&all_threads
,
1269 second_thread_of_pid_p
, &counter
) == NULL
);
1275 linux_kill_one_lwp (struct lwp_info
*lwp
)
1277 struct thread_info
*thr
= get_lwp_thread (lwp
);
1278 int pid
= lwpid_of (thr
);
1280 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1281 there is no signal context, and ptrace(PTRACE_KILL) (or
1282 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1283 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1284 alternative is to kill with SIGKILL. We only need one SIGKILL
1285 per process, not one for each thread. But since we still support
1286 support debugging programs using raw clone without CLONE_THREAD,
1287 we send one for each thread. For years, we used PTRACE_KILL
1288 only, so we're being a bit paranoid about some old kernels where
1289 PTRACE_KILL might work better (dubious if there are any such, but
1290 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1291 second, and so we're fine everywhere. */
1294 kill_lwp (pid
, SIGKILL
);
1297 int save_errno
= errno
;
1299 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1300 target_pid_to_str (ptid_of (thr
)),
1301 save_errno
? strerror (save_errno
) : "OK");
1305 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1308 int save_errno
= errno
;
1310 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1311 target_pid_to_str (ptid_of (thr
)),
1312 save_errno
? strerror (save_errno
) : "OK");
1316 /* Kill LWP and wait for it to die. */
1319 kill_wait_lwp (struct lwp_info
*lwp
)
1321 struct thread_info
*thr
= get_lwp_thread (lwp
);
1322 int pid
= ptid_get_pid (ptid_of (thr
));
1323 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1328 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1332 linux_kill_one_lwp (lwp
);
1334 /* Make sure it died. Notes:
1336 - The loop is most likely unnecessary.
1338 - We don't use linux_wait_for_event as that could delete lwps
1339 while we're iterating over them. We're not interested in
1340 any pending status at this point, only in making sure all
1341 wait status on the kernel side are collected until the
1344 - We don't use __WALL here as the __WALL emulation relies on
1345 SIGCHLD, and killing a stopped process doesn't generate
1346 one, nor an exit status.
1348 res
= my_waitpid (lwpid
, &wstat
, 0);
1349 if (res
== -1 && errno
== ECHILD
)
1350 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1351 } while (res
> 0 && WIFSTOPPED (wstat
));
1353 /* Even if it was stopped, the child may have already disappeared.
1354 E.g., if it was killed by SIGKILL. */
1355 if (res
< 0 && errno
!= ECHILD
)
1356 perror_with_name ("kill_wait_lwp");
1359 /* Callback for `find_inferior'. Kills an lwp of a given process,
1360 except the leader. */
1363 kill_one_lwp_callback (thread_info
*thread
, void *args
)
1365 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1366 int pid
= * (int *) args
;
1368 if (thread
->id
.pid () != pid
)
1371 /* We avoid killing the first thread here, because of a Linux kernel (at
1372 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1373 the children get a chance to be reaped, it will remain a zombie
1376 if (lwpid_of (thread
) == pid
)
1379 debug_printf ("lkop: is last of process %s\n",
1380 target_pid_to_str (thread
->id
));
1384 kill_wait_lwp (lwp
);
1389 linux_kill (int pid
)
1391 struct process_info
*process
;
1392 struct lwp_info
*lwp
;
1394 process
= find_process_pid (pid
);
1395 if (process
== NULL
)
1398 /* If we're killing a running inferior, make sure it is stopped
1399 first, as PTRACE_KILL will not work otherwise. */
1400 stop_all_lwps (0, NULL
);
1402 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1404 /* See the comment in linux_kill_one_lwp. We did not kill the first
1405 thread in the list, so do so now. */
1406 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1411 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1415 kill_wait_lwp (lwp
);
1417 the_target
->mourn (process
);
1419 /* Since we presently can only stop all lwps of all processes, we
1420 need to unstop lwps of other processes. */
1421 unstop_all_lwps (0, NULL
);
1425 /* Get pending signal of THREAD, for detaching purposes. This is the
1426 signal the thread last stopped for, which we need to deliver to the
1427 thread when detaching, otherwise, it'd be suppressed/lost. */
1430 get_detach_signal (struct thread_info
*thread
)
1432 enum gdb_signal signo
= GDB_SIGNAL_0
;
1434 struct lwp_info
*lp
= get_thread_lwp (thread
);
1436 if (lp
->status_pending_p
)
1437 status
= lp
->status_pending
;
1440 /* If the thread had been suspended by gdbserver, and it stopped
1441 cleanly, then it'll have stopped with SIGSTOP. But we don't
1442 want to deliver that SIGSTOP. */
1443 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1444 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1447 /* Otherwise, we may need to deliver the signal we
1449 status
= lp
->last_status
;
1452 if (!WIFSTOPPED (status
))
1455 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1456 target_pid_to_str (ptid_of (thread
)));
1460 /* Extended wait statuses aren't real SIGTRAPs. */
1461 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1464 debug_printf ("GPS: lwp %s had stopped with extended "
1465 "status: no pending signal\n",
1466 target_pid_to_str (ptid_of (thread
)));
1470 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1472 if (program_signals_p
&& !program_signals
[signo
])
1475 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1476 target_pid_to_str (ptid_of (thread
)),
1477 gdb_signal_to_string (signo
));
1480 else if (!program_signals_p
1481 /* If we have no way to know which signals GDB does not
1482 want to have passed to the program, assume
1483 SIGTRAP/SIGINT, which is GDB's default. */
1484 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1487 debug_printf ("GPS: lwp %s had signal %s, "
1488 "but we don't know if we should pass it. "
1489 "Default to not.\n",
1490 target_pid_to_str (ptid_of (thread
)),
1491 gdb_signal_to_string (signo
));
1497 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1498 target_pid_to_str (ptid_of (thread
)),
1499 gdb_signal_to_string (signo
));
1501 return WSTOPSIG (status
);
1505 /* Detach from LWP. */
1508 linux_detach_one_lwp (struct lwp_info
*lwp
)
1510 struct thread_info
*thread
= get_lwp_thread (lwp
);
1514 /* If there is a pending SIGSTOP, get rid of it. */
1515 if (lwp
->stop_expected
)
1518 debug_printf ("Sending SIGCONT to %s\n",
1519 target_pid_to_str (ptid_of (thread
)));
1521 kill_lwp (lwpid_of (thread
), SIGCONT
);
1522 lwp
->stop_expected
= 0;
1525 /* Pass on any pending signal for this thread. */
1526 sig
= get_detach_signal (thread
);
1528 /* Preparing to resume may try to write registers, and fail if the
1529 lwp is zombie. If that happens, ignore the error. We'll handle
1530 it below, when detach fails with ESRCH. */
1533 /* Flush any pending changes to the process's registers. */
1534 regcache_invalidate_thread (thread
);
1536 /* Finally, let it resume. */
1537 if (the_low_target
.prepare_to_resume
!= NULL
)
1538 the_low_target
.prepare_to_resume (lwp
);
1540 CATCH (ex
, RETURN_MASK_ERROR
)
1542 if (!check_ptrace_stopped_lwp_gone (lwp
))
1543 throw_exception (ex
);
1547 lwpid
= lwpid_of (thread
);
1548 if (ptrace (PTRACE_DETACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0,
1549 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1551 int save_errno
= errno
;
1553 /* We know the thread exists, so ESRCH must mean the lwp is
1554 zombie. This can happen if one of the already-detached
1555 threads exits the whole thread group. In that case we're
1556 still attached, and must reap the lwp. */
1557 if (save_errno
== ESRCH
)
1561 ret
= my_waitpid (lwpid
, &status
, __WALL
);
1564 warning (_("Couldn't reap LWP %d while detaching: %s"),
1565 lwpid
, strerror (errno
));
1567 else if (!WIFEXITED (status
) && !WIFSIGNALED (status
))
1569 warning (_("Reaping LWP %d while detaching "
1570 "returned unexpected status 0x%x"),
1576 error (_("Can't detach %s: %s"),
1577 target_pid_to_str (ptid_of (thread
)),
1578 strerror (save_errno
));
1581 else if (debug_threads
)
1583 debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n",
1584 target_pid_to_str (ptid_of (thread
)),
1591 /* Callback for find_inferior. Detaches from non-leader threads of a
1595 linux_detach_lwp_callback (thread_info
*thread
, void *args
)
1597 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1598 int pid
= *(int *) args
;
1599 int lwpid
= lwpid_of (thread
);
1601 /* Skip other processes. */
1602 if (thread
->id
.pid () != pid
)
1605 /* We don't actually detach from the thread group leader just yet.
1606 If the thread group exits, we must reap the zombie clone lwps
1607 before we're able to reap the leader. */
1608 if (thread
->id
.pid () == lwpid
)
1611 linux_detach_one_lwp (lwp
);
1616 linux_detach (int pid
)
1618 struct process_info
*process
;
1619 struct lwp_info
*main_lwp
;
1621 process
= find_process_pid (pid
);
1622 if (process
== NULL
)
1625 /* As there's a step over already in progress, let it finish first,
1626 otherwise nesting a stabilize_threads operation on top gets real
1628 complete_ongoing_step_over ();
1630 /* Stop all threads before detaching. First, ptrace requires that
1631 the thread is stopped to sucessfully detach. Second, thread_db
1632 may need to uninstall thread event breakpoints from memory, which
1633 only works with a stopped process anyway. */
1634 stop_all_lwps (0, NULL
);
1636 #ifdef USE_THREAD_DB
1637 thread_db_detach (process
);
1640 /* Stabilize threads (move out of jump pads). */
1641 stabilize_threads ();
1643 /* Detach from the clone lwps first. If the thread group exits just
1644 while we're detaching, we must reap the clone lwps before we're
1645 able to reap the leader. */
1646 find_inferior (&all_threads
, linux_detach_lwp_callback
, &pid
);
1648 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1649 linux_detach_one_lwp (main_lwp
);
1651 the_target
->mourn (process
);
1653 /* Since we presently can only stop all lwps of all processes, we
1654 need to unstop lwps of other processes. */
1655 unstop_all_lwps (0, NULL
);
1659 /* Remove all LWPs that belong to process PROC from the lwp list. */
1662 delete_lwp_callback (thread_info
*thread
, void *proc
)
1664 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1665 struct process_info
*process
= (struct process_info
*) proc
;
1667 if (pid_of (thread
) == pid_of (process
))
1674 linux_mourn (struct process_info
*process
)
1676 struct process_info_private
*priv
;
1678 #ifdef USE_THREAD_DB
1679 thread_db_mourn (process
);
1682 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1684 /* Freeing all private data. */
1685 priv
= process
->priv
;
1686 if (the_low_target
.delete_process
!= NULL
)
1687 the_low_target
.delete_process (priv
->arch_private
);
1689 gdb_assert (priv
->arch_private
== NULL
);
1691 process
->priv
= NULL
;
1693 remove_process (process
);
1697 linux_join (int pid
)
1702 ret
= my_waitpid (pid
, &status
, 0);
1703 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1705 } while (ret
!= -1 || errno
!= ECHILD
);
1708 /* Return nonzero if the given thread is still alive. */
1710 linux_thread_alive (ptid_t ptid
)
1712 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1714 /* We assume we always know if a thread exits. If a whole process
1715 exited but we still haven't been able to report it to GDB, we'll
1716 hold on to the last lwp of the dead process. */
1718 return !lwp_is_marked_dead (lwp
);
1723 /* Return 1 if this lwp still has an interesting status pending. If
1724 not (e.g., it had stopped for a breakpoint that is gone), return
1728 thread_still_has_status_pending_p (struct thread_info
*thread
)
1730 struct lwp_info
*lp
= get_thread_lwp (thread
);
1732 if (!lp
->status_pending_p
)
1735 if (thread
->last_resume_kind
!= resume_stop
1736 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1737 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1739 struct thread_info
*saved_thread
;
1743 gdb_assert (lp
->last_status
!= 0);
1747 saved_thread
= current_thread
;
1748 current_thread
= thread
;
1750 if (pc
!= lp
->stop_pc
)
1753 debug_printf ("PC of %ld changed\n",
1758 #if !USE_SIGTRAP_SIGINFO
1759 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1760 && !(*the_low_target
.breakpoint_at
) (pc
))
1763 debug_printf ("previous SW breakpoint of %ld gone\n",
1767 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1768 && !hardware_breakpoint_inserted_here (pc
))
1771 debug_printf ("previous HW breakpoint of %ld gone\n",
1777 current_thread
= saved_thread
;
1782 debug_printf ("discarding pending breakpoint status\n");
1783 lp
->status_pending_p
= 0;
1791 /* Returns true if LWP is resumed from the client's perspective. */
1794 lwp_resumed (struct lwp_info
*lwp
)
1796 struct thread_info
*thread
= get_lwp_thread (lwp
);
1798 if (thread
->last_resume_kind
!= resume_stop
)
1801 /* Did gdb send us a `vCont;t', but we haven't reported the
1802 corresponding stop to gdb yet? If so, the thread is still
1803 resumed/running from gdb's perspective. */
1804 if (thread
->last_resume_kind
== resume_stop
1805 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1811 /* Return 1 if this lwp has an interesting status pending. */
1813 status_pending_p_callback (thread_info
*thread
, void *arg
)
1815 struct lwp_info
*lp
= get_thread_lwp (thread
);
1816 ptid_t ptid
= * (ptid_t
*) arg
;
1818 /* Check if we're only interested in events from a specific process
1819 or a specific LWP. */
1820 if (!ptid_match (ptid_of (thread
), ptid
))
1823 if (!lwp_resumed (lp
))
1826 if (lp
->status_pending_p
1827 && !thread_still_has_status_pending_p (thread
))
1829 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1833 return lp
->status_pending_p
;
1837 same_lwp (thread_info
*thread
, void *data
)
1839 ptid_t ptid
= *(ptid_t
*) data
;
1842 if (ptid_get_lwp (ptid
) != 0)
1843 lwp
= ptid_get_lwp (ptid
);
1845 lwp
= ptid_get_pid (ptid
);
1847 if (thread
->id
.lwp () == lwp
)
1854 find_lwp_pid (ptid_t ptid
)
1856 thread_info
*thread
= find_inferior (&all_threads
, same_lwp
, &ptid
);
1861 return get_thread_lwp (thread
);
1864 /* Return the number of known LWPs in the tgid given by PID. */
1871 for_each_thread (pid
, [&] (thread_info
*thread
)
1879 /* See nat/linux-nat.h. */
1882 iterate_over_lwps (ptid_t filter
,
1883 iterate_over_lwps_ftype callback
,
1886 thread_info
*thread
= find_thread (filter
, [&] (thread_info
*thread
)
1888 lwp_info
*lwp
= get_thread_lwp (thread
);
1890 return callback (lwp
, data
);
1896 return get_thread_lwp (thread
);
1899 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1900 their exits until all other threads in the group have exited. */
1903 check_zombie_leaders (void)
1905 for_each_process ([] (process_info
*proc
) {
1906 pid_t leader_pid
= pid_of (proc
);
1907 struct lwp_info
*leader_lp
;
1909 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1912 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1913 "num_lwps=%d, zombie=%d\n",
1914 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1915 linux_proc_pid_is_zombie (leader_pid
));
1917 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1918 /* Check if there are other threads in the group, as we may
1919 have raced with the inferior simply exiting. */
1920 && !last_thread_of_process_p (leader_pid
)
1921 && linux_proc_pid_is_zombie (leader_pid
))
1923 /* A leader zombie can mean one of two things:
1925 - It exited, and there's an exit status pending
1926 available, or only the leader exited (not the whole
1927 program). In the latter case, we can't waitpid the
1928 leader's exit status until all other threads are gone.
1930 - There are 3 or more threads in the group, and a thread
1931 other than the leader exec'd. On an exec, the Linux
1932 kernel destroys all other threads (except the execing
1933 one) in the thread group, and resets the execing thread's
1934 tid to the tgid. No exit notification is sent for the
1935 execing thread -- from the ptracer's perspective, it
1936 appears as though the execing thread just vanishes.
1937 Until we reap all other threads except the leader and the
1938 execing thread, the leader will be zombie, and the
1939 execing thread will be in `D (disc sleep)'. As soon as
1940 all other threads are reaped, the execing thread changes
1941 it's tid to the tgid, and the previous (zombie) leader
1942 vanishes, giving place to the "new" leader. We could try
1943 distinguishing the exit and exec cases, by waiting once
1944 more, and seeing if something comes out, but it doesn't
1945 sound useful. The previous leader _does_ go away, and
1946 we'll re-add the new one once we see the exec event
1947 (which is just the same as what would happen if the
1948 previous leader did exit voluntarily before some other
1952 debug_printf ("CZL: Thread group leader %d zombie "
1953 "(it exited, or another thread execd).\n",
1956 delete_lwp (leader_lp
);
1961 /* Callback for `find_inferior'. Returns the first LWP that is not
1962 stopped. ARG is a PTID filter. */
1965 not_stopped_callback (thread_info
*thread
, void *arg
)
1967 struct lwp_info
*lwp
;
1968 ptid_t filter
= *(ptid_t
*) arg
;
1970 if (!ptid_match (ptid_of (thread
), filter
))
1973 lwp
= get_thread_lwp (thread
);
1980 /* Increment LWP's suspend count. */
1983 lwp_suspended_inc (struct lwp_info
*lwp
)
1987 if (debug_threads
&& lwp
->suspended
> 4)
1989 struct thread_info
*thread
= get_lwp_thread (lwp
);
1991 debug_printf ("LWP %ld has a suspiciously high suspend count,"
1992 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
1996 /* Decrement LWP's suspend count. */
1999 lwp_suspended_decr (struct lwp_info
*lwp
)
2003 if (lwp
->suspended
< 0)
2005 struct thread_info
*thread
= get_lwp_thread (lwp
);
2007 internal_error (__FILE__
, __LINE__
,
2008 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
2013 /* This function should only be called if the LWP got a SIGTRAP.
2015 Handle any tracepoint steps or hits. Return true if a tracepoint
2016 event was handled, 0 otherwise. */
2019 handle_tracepoints (struct lwp_info
*lwp
)
2021 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
2022 int tpoint_related_event
= 0;
2024 gdb_assert (lwp
->suspended
== 0);
2026 /* If this tracepoint hit causes a tracing stop, we'll immediately
2027 uninsert tracepoints. To do this, we temporarily pause all
2028 threads, unpatch away, and then unpause threads. We need to make
2029 sure the unpausing doesn't resume LWP too. */
2030 lwp_suspended_inc (lwp
);
2032 /* And we need to be sure that any all-threads-stopping doesn't try
2033 to move threads out of the jump pads, as it could deadlock the
2034 inferior (LWP could be in the jump pad, maybe even holding the
2037 /* Do any necessary step collect actions. */
2038 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2040 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2042 /* See if we just hit a tracepoint and do its main collect
2044 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2046 lwp_suspended_decr (lwp
);
2048 gdb_assert (lwp
->suspended
== 0);
2049 gdb_assert (!stabilizing_threads
2050 || (lwp
->collecting_fast_tracepoint
2051 != fast_tpoint_collect_result::not_collecting
));
2053 if (tpoint_related_event
)
2056 debug_printf ("got a tracepoint event\n");
2063 /* Convenience wrapper. Returns information about LWP's fast tracepoint
2064 collection status. */
2066 static fast_tpoint_collect_result
2067 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2068 struct fast_tpoint_collect_status
*status
)
2070 CORE_ADDR thread_area
;
2071 struct thread_info
*thread
= get_lwp_thread (lwp
);
2073 if (the_low_target
.get_thread_area
== NULL
)
2074 return fast_tpoint_collect_result::not_collecting
;
2076 /* Get the thread area address. This is used to recognize which
2077 thread is which when tracing with the in-process agent library.
2078 We don't read anything from the address, and treat it as opaque;
2079 it's the address itself that we assume is unique per-thread. */
2080 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2081 return fast_tpoint_collect_result::not_collecting
;
2083 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2086 /* The reason we resume in the caller, is because we want to be able
2087 to pass lwp->status_pending as WSTAT, and we need to clear
2088 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2089 refuses to resume. */
2092 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2094 struct thread_info
*saved_thread
;
2096 saved_thread
= current_thread
;
2097 current_thread
= get_lwp_thread (lwp
);
2100 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2101 && supports_fast_tracepoints ()
2102 && agent_loaded_p ())
2104 struct fast_tpoint_collect_status status
;
2107 debug_printf ("Checking whether LWP %ld needs to move out of the "
2109 lwpid_of (current_thread
));
2111 fast_tpoint_collect_result r
2112 = linux_fast_tracepoint_collecting (lwp
, &status
);
2115 || (WSTOPSIG (*wstat
) != SIGILL
2116 && WSTOPSIG (*wstat
) != SIGFPE
2117 && WSTOPSIG (*wstat
) != SIGSEGV
2118 && WSTOPSIG (*wstat
) != SIGBUS
))
2120 lwp
->collecting_fast_tracepoint
= r
;
2122 if (r
!= fast_tpoint_collect_result::not_collecting
)
2124 if (r
== fast_tpoint_collect_result::before_insn
2125 && lwp
->exit_jump_pad_bkpt
== NULL
)
2127 /* Haven't executed the original instruction yet.
2128 Set breakpoint there, and wait till it's hit,
2129 then single-step until exiting the jump pad. */
2130 lwp
->exit_jump_pad_bkpt
2131 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2135 debug_printf ("Checking whether LWP %ld needs to move out of "
2136 "the jump pad...it does\n",
2137 lwpid_of (current_thread
));
2138 current_thread
= saved_thread
;
2145 /* If we get a synchronous signal while collecting, *and*
2146 while executing the (relocated) original instruction,
2147 reset the PC to point at the tpoint address, before
2148 reporting to GDB. Otherwise, it's an IPA lib bug: just
2149 report the signal to GDB, and pray for the best. */
2151 lwp
->collecting_fast_tracepoint
2152 = fast_tpoint_collect_result::not_collecting
;
2154 if (r
!= fast_tpoint_collect_result::not_collecting
2155 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2156 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2159 struct regcache
*regcache
;
2161 /* The si_addr on a few signals references the address
2162 of the faulting instruction. Adjust that as
2164 if ((WSTOPSIG (*wstat
) == SIGILL
2165 || WSTOPSIG (*wstat
) == SIGFPE
2166 || WSTOPSIG (*wstat
) == SIGBUS
2167 || WSTOPSIG (*wstat
) == SIGSEGV
)
2168 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2169 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2170 /* Final check just to make sure we don't clobber
2171 the siginfo of non-kernel-sent signals. */
2172 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2174 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2175 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2176 (PTRACE_TYPE_ARG3
) 0, &info
);
2179 regcache
= get_thread_regcache (current_thread
, 1);
2180 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2181 lwp
->stop_pc
= status
.tpoint_addr
;
2183 /* Cancel any fast tracepoint lock this thread was
2185 force_unlock_trace_buffer ();
2188 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2191 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2192 "stopping all threads momentarily.\n");
2194 stop_all_lwps (1, lwp
);
2196 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2197 lwp
->exit_jump_pad_bkpt
= NULL
;
2199 unstop_all_lwps (1, lwp
);
2201 gdb_assert (lwp
->suspended
>= 0);
2207 debug_printf ("Checking whether LWP %ld needs to move out of the "
2209 lwpid_of (current_thread
));
2211 current_thread
= saved_thread
;
2215 /* Enqueue one signal in the "signals to report later when out of the
2219 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2221 struct pending_signals
*p_sig
;
2222 struct thread_info
*thread
= get_lwp_thread (lwp
);
2225 debug_printf ("Deferring signal %d for LWP %ld.\n",
2226 WSTOPSIG (*wstat
), lwpid_of (thread
));
2230 struct pending_signals
*sig
;
2232 for (sig
= lwp
->pending_signals_to_report
;
2235 debug_printf (" Already queued %d\n",
2238 debug_printf (" (no more currently queued signals)\n");
2241 /* Don't enqueue non-RT signals if they are already in the deferred
2242 queue. (SIGSTOP being the easiest signal to see ending up here
2244 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2246 struct pending_signals
*sig
;
2248 for (sig
= lwp
->pending_signals_to_report
;
2252 if (sig
->signal
== WSTOPSIG (*wstat
))
2255 debug_printf ("Not requeuing already queued non-RT signal %d"
2264 p_sig
= XCNEW (struct pending_signals
);
2265 p_sig
->prev
= lwp
->pending_signals_to_report
;
2266 p_sig
->signal
= WSTOPSIG (*wstat
);
2268 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2271 lwp
->pending_signals_to_report
= p_sig
;
2274 /* Dequeue one signal from the "signals to report later when out of
2275 the jump pad" list. */
2278 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2280 struct thread_info
*thread
= get_lwp_thread (lwp
);
2282 if (lwp
->pending_signals_to_report
!= NULL
)
2284 struct pending_signals
**p_sig
;
2286 p_sig
= &lwp
->pending_signals_to_report
;
2287 while ((*p_sig
)->prev
!= NULL
)
2288 p_sig
= &(*p_sig
)->prev
;
2290 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2291 if ((*p_sig
)->info
.si_signo
!= 0)
2292 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2298 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2299 WSTOPSIG (*wstat
), lwpid_of (thread
));
2303 struct pending_signals
*sig
;
2305 for (sig
= lwp
->pending_signals_to_report
;
2308 debug_printf (" Still queued %d\n",
2311 debug_printf (" (no more queued signals)\n");
2320 /* Fetch the possibly triggered data watchpoint info and store it in
2323 On some archs, like x86, that use debug registers to set
2324 watchpoints, it's possible that the way to know which watched
2325 address trapped, is to check the register that is used to select
2326 which address to watch. Problem is, between setting the watchpoint
2327 and reading back which data address trapped, the user may change
2328 the set of watchpoints, and, as a consequence, GDB changes the
2329 debug registers in the inferior. To avoid reading back a stale
2330 stopped-data-address when that happens, we cache in LP the fact
2331 that a watchpoint trapped, and the corresponding data address, as
2332 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2333 registers meanwhile, we have the cached data we can rely on. */
2336 check_stopped_by_watchpoint (struct lwp_info
*child
)
2338 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2340 struct thread_info
*saved_thread
;
2342 saved_thread
= current_thread
;
2343 current_thread
= get_lwp_thread (child
);
2345 if (the_low_target
.stopped_by_watchpoint ())
2347 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2349 if (the_low_target
.stopped_data_address
!= NULL
)
2350 child
->stopped_data_address
2351 = the_low_target
.stopped_data_address ();
2353 child
->stopped_data_address
= 0;
2356 current_thread
= saved_thread
;
2359 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2362 /* Return the ptrace options that we want to try to enable. */
2365 linux_low_ptrace_options (int attached
)
2370 options
|= PTRACE_O_EXITKILL
;
2372 if (report_fork_events
)
2373 options
|= PTRACE_O_TRACEFORK
;
2375 if (report_vfork_events
)
2376 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2378 if (report_exec_events
)
2379 options
|= PTRACE_O_TRACEEXEC
;
2381 options
|= PTRACE_O_TRACESYSGOOD
;
2386 /* Do low-level handling of the event, and check if we should go on
2387 and pass it to caller code. Return the affected lwp if we are, or
2390 static struct lwp_info
*
2391 linux_low_filter_event (int lwpid
, int wstat
)
2393 struct lwp_info
*child
;
2394 struct thread_info
*thread
;
2395 int have_stop_pc
= 0;
2397 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2399 /* Check for stop events reported by a process we didn't already
2400 know about - anything not already in our LWP list.
2402 If we're expecting to receive stopped processes after
2403 fork, vfork, and clone events, then we'll just add the
2404 new one to our list and go back to waiting for the event
2405 to be reported - the stopped process might be returned
2406 from waitpid before or after the event is.
2408 But note the case of a non-leader thread exec'ing after the
2409 leader having exited, and gone from our lists (because
2410 check_zombie_leaders deleted it). The non-leader thread
2411 changes its tid to the tgid. */
2413 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2414 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2418 /* A multi-thread exec after we had seen the leader exiting. */
2421 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2422 "after exec.\n", lwpid
);
2425 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2426 child
= add_lwp (child_ptid
);
2428 current_thread
= child
->thread
;
2431 /* If we didn't find a process, one of two things presumably happened:
2432 - A process we started and then detached from has exited. Ignore it.
2433 - A process we are controlling has forked and the new child's stop
2434 was reported to us by the kernel. Save its PID. */
2435 if (child
== NULL
&& WIFSTOPPED (wstat
))
2437 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2440 else if (child
== NULL
)
2443 thread
= get_lwp_thread (child
);
2447 child
->last_status
= wstat
;
2449 /* Check if the thread has exited. */
2450 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2453 debug_printf ("LLFE: %d exited.\n", lwpid
);
2455 if (finish_step_over (child
))
2457 /* Unsuspend all other LWPs, and set them back running again. */
2458 unsuspend_all_lwps (child
);
2461 /* If there is at least one more LWP, then the exit signal was
2462 not the end of the debugged application and should be
2463 ignored, unless GDB wants to hear about thread exits. */
2464 if (report_thread_events
2465 || last_thread_of_process_p (pid_of (thread
)))
2467 /* Since events are serialized to GDB core, and we can't
2468 report this one right now. Leave the status pending for
2469 the next time we're able to report it. */
2470 mark_lwp_dead (child
, wstat
);
2480 gdb_assert (WIFSTOPPED (wstat
));
2482 if (WIFSTOPPED (wstat
))
2484 struct process_info
*proc
;
2486 /* Architecture-specific setup after inferior is running. */
2487 proc
= find_process_pid (pid_of (thread
));
2488 if (proc
->tdesc
== NULL
)
2492 /* This needs to happen after we have attached to the
2493 inferior and it is stopped for the first time, but
2494 before we access any inferior registers. */
2495 linux_arch_setup_thread (thread
);
2499 /* The process is started, but GDBserver will do
2500 architecture-specific setup after the program stops at
2501 the first instruction. */
2502 child
->status_pending_p
= 1;
2503 child
->status_pending
= wstat
;
2509 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2511 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2512 int options
= linux_low_ptrace_options (proc
->attached
);
2514 linux_enable_event_reporting (lwpid
, options
);
2515 child
->must_set_ptrace_flags
= 0;
2518 /* Always update syscall_state, even if it will be filtered later. */
2519 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2521 child
->syscall_state
2522 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2523 ? TARGET_WAITKIND_SYSCALL_RETURN
2524 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2528 /* Almost all other ptrace-stops are known to be outside of system
2529 calls, with further exceptions in handle_extended_wait. */
2530 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2533 /* Be careful to not overwrite stop_pc until save_stop_reason is
2535 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2536 && linux_is_extended_waitstatus (wstat
))
2538 child
->stop_pc
= get_pc (child
);
2539 if (handle_extended_wait (&child
, wstat
))
2541 /* The event has been handled, so just return without
2547 if (linux_wstatus_maybe_breakpoint (wstat
))
2549 if (save_stop_reason (child
))
2554 child
->stop_pc
= get_pc (child
);
2556 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2557 && child
->stop_expected
)
2560 debug_printf ("Expected stop.\n");
2561 child
->stop_expected
= 0;
2563 if (thread
->last_resume_kind
== resume_stop
)
2565 /* We want to report the stop to the core. Treat the
2566 SIGSTOP as a normal event. */
2568 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2569 target_pid_to_str (ptid_of (thread
)));
2571 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2573 /* Stopping threads. We don't want this SIGSTOP to end up
2576 debug_printf ("LLW: SIGSTOP caught for %s "
2577 "while stopping threads.\n",
2578 target_pid_to_str (ptid_of (thread
)));
2583 /* This is a delayed SIGSTOP. Filter out the event. */
2585 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2586 child
->stepping
? "step" : "continue",
2587 target_pid_to_str (ptid_of (thread
)));
2589 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2594 child
->status_pending_p
= 1;
2595 child
->status_pending
= wstat
;
2599 /* Return true if THREAD is doing hardware single step. */
2602 maybe_hw_step (struct thread_info
*thread
)
2604 if (can_hardware_single_step ())
2608 /* GDBserver must insert single-step breakpoint for software
2610 gdb_assert (has_single_step_breakpoints (thread
));
2615 /* Resume LWPs that are currently stopped without any pending status
2616 to report, but are resumed from the core's perspective. */
2619 resume_stopped_resumed_lwps (thread_info
*thread
)
2621 struct lwp_info
*lp
= get_thread_lwp (thread
);
2625 && !lp
->status_pending_p
2626 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2630 if (thread
->last_resume_kind
== resume_step
)
2631 step
= maybe_hw_step (thread
);
2634 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2635 target_pid_to_str (ptid_of (thread
)),
2636 paddress (lp
->stop_pc
),
2639 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2643 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2644 match FILTER_PTID (leaving others pending). The PTIDs can be:
2645 minus_one_ptid, to specify any child; a pid PTID, specifying all
2646 lwps of a thread group; or a PTID representing a single lwp. Store
2647 the stop status through the status pointer WSTAT. OPTIONS is
2648 passed to the waitpid call. Return 0 if no event was found and
2649 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2650 was found. Return the PID of the stopped child otherwise. */
2653 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2654 int *wstatp
, int options
)
2656 struct thread_info
*event_thread
;
2657 struct lwp_info
*event_child
, *requested_child
;
2658 sigset_t block_mask
, prev_mask
;
2661 /* N.B. event_thread points to the thread_info struct that contains
2662 event_child. Keep them in sync. */
2663 event_thread
= NULL
;
2665 requested_child
= NULL
;
2667 /* Check for a lwp with a pending status. */
2669 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2671 event_thread
= (struct thread_info
*)
2672 find_inferior_in_random (&all_threads
, status_pending_p_callback
,
2674 if (event_thread
!= NULL
)
2675 event_child
= get_thread_lwp (event_thread
);
2676 if (debug_threads
&& event_thread
)
2677 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2679 else if (!ptid_equal (filter_ptid
, null_ptid
))
2681 requested_child
= find_lwp_pid (filter_ptid
);
2683 if (stopping_threads
== NOT_STOPPING_THREADS
2684 && requested_child
->status_pending_p
2685 && (requested_child
->collecting_fast_tracepoint
2686 != fast_tpoint_collect_result::not_collecting
))
2688 enqueue_one_deferred_signal (requested_child
,
2689 &requested_child
->status_pending
);
2690 requested_child
->status_pending_p
= 0;
2691 requested_child
->status_pending
= 0;
2692 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2695 if (requested_child
->suspended
2696 && requested_child
->status_pending_p
)
2698 internal_error (__FILE__
, __LINE__
,
2699 "requesting an event out of a"
2700 " suspended child?");
2703 if (requested_child
->status_pending_p
)
2705 event_child
= requested_child
;
2706 event_thread
= get_lwp_thread (event_child
);
2710 if (event_child
!= NULL
)
2713 debug_printf ("Got an event from pending child %ld (%04x)\n",
2714 lwpid_of (event_thread
), event_child
->status_pending
);
2715 *wstatp
= event_child
->status_pending
;
2716 event_child
->status_pending_p
= 0;
2717 event_child
->status_pending
= 0;
2718 current_thread
= event_thread
;
2719 return lwpid_of (event_thread
);
2722 /* But if we don't find a pending event, we'll have to wait.
2724 We only enter this loop if no process has a pending wait status.
2725 Thus any action taken in response to a wait status inside this
2726 loop is responding as soon as we detect the status, not after any
2729 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2730 all signals while here. */
2731 sigfillset (&block_mask
);
2732 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2734 /* Always pull all events out of the kernel. We'll randomly select
2735 an event LWP out of all that have events, to prevent
2737 while (event_child
== NULL
)
2741 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2744 - If the thread group leader exits while other threads in the
2745 thread group still exist, waitpid(TGID, ...) hangs. That
2746 waitpid won't return an exit status until the other threads
2747 in the group are reaped.
2749 - When a non-leader thread execs, that thread just vanishes
2750 without reporting an exit (so we'd hang if we waited for it
2751 explicitly in that case). The exec event is reported to
2754 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2757 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2758 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2764 debug_printf ("LLW: waitpid %ld received %s\n",
2765 (long) ret
, status_to_str (*wstatp
));
2768 /* Filter all events. IOW, leave all events pending. We'll
2769 randomly select an event LWP out of all that have events
2771 linux_low_filter_event (ret
, *wstatp
);
2772 /* Retry until nothing comes out of waitpid. A single
2773 SIGCHLD can indicate more than one child stopped. */
2777 /* Now that we've pulled all events out of the kernel, resume
2778 LWPs that don't have an interesting event to report. */
2779 if (stopping_threads
== NOT_STOPPING_THREADS
)
2780 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2782 /* ... and find an LWP with a status to report to the core, if
2784 event_thread
= (struct thread_info
*)
2785 find_inferior_in_random (&all_threads
, status_pending_p_callback
,
2787 if (event_thread
!= NULL
)
2789 event_child
= get_thread_lwp (event_thread
);
2790 *wstatp
= event_child
->status_pending
;
2791 event_child
->status_pending_p
= 0;
2792 event_child
->status_pending
= 0;
2796 /* Check for zombie thread group leaders. Those can't be reaped
2797 until all other threads in the thread group are. */
2798 check_zombie_leaders ();
2800 /* If there are no resumed children left in the set of LWPs we
2801 want to wait for, bail. We can't just block in
2802 waitpid/sigsuspend, because lwps might have been left stopped
2803 in trace-stop state, and we'd be stuck forever waiting for
2804 their status to change (which would only happen if we resumed
2805 them). Even if WNOHANG is set, this return code is preferred
2806 over 0 (below), as it is more detailed. */
2807 if ((find_inferior (&all_threads
,
2808 not_stopped_callback
,
2809 &wait_ptid
) == NULL
))
2812 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2813 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2817 /* No interesting event to report to the caller. */
2818 if ((options
& WNOHANG
))
2821 debug_printf ("WNOHANG set, no event found\n");
2823 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2827 /* Block until we get an event reported with SIGCHLD. */
2829 debug_printf ("sigsuspend'ing\n");
2831 sigsuspend (&prev_mask
);
2832 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2836 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2838 current_thread
= event_thread
;
2840 return lwpid_of (event_thread
);
2843 /* Wait for an event from child(ren) PTID. PTIDs can be:
2844 minus_one_ptid, to specify any child; a pid PTID, specifying all
2845 lwps of a thread group; or a PTID representing a single lwp. Store
2846 the stop status through the status pointer WSTAT. OPTIONS is
2847 passed to the waitpid call. Return 0 if no event was found and
2848 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2849 was found. Return the PID of the stopped child otherwise. */
2852 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2854 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2857 /* Count the LWP's that have had events. */
2860 count_events_callback (thread_info
*thread
, void *data
)
2862 struct lwp_info
*lp
= get_thread_lwp (thread
);
2863 int *count
= (int *) data
;
2865 gdb_assert (count
!= NULL
);
2867 /* Count only resumed LWPs that have an event pending. */
2868 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2869 && lp
->status_pending_p
)
2875 /* Select the LWP (if any) that is currently being single-stepped. */
2878 select_singlestep_lwp_callback (thread_info
*thread
, void *data
)
2880 struct lwp_info
*lp
= get_thread_lwp (thread
);
2882 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2883 && thread
->last_resume_kind
== resume_step
2884 && lp
->status_pending_p
)
2890 /* Select the Nth LWP that has had an event. */
2893 select_event_lwp_callback (thread_info
*thread
, void *data
)
2895 struct lwp_info
*lp
= get_thread_lwp (thread
);
2896 int *selector
= (int *) data
;
2898 gdb_assert (selector
!= NULL
);
2900 /* Select only resumed LWPs that have an event pending. */
2901 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2902 && lp
->status_pending_p
)
2903 if ((*selector
)-- == 0)
2909 /* Select one LWP out of those that have events pending. */
2912 select_event_lwp (struct lwp_info
**orig_lp
)
2915 int random_selector
;
2916 struct thread_info
*event_thread
= NULL
;
2918 /* In all-stop, give preference to the LWP that is being
2919 single-stepped. There will be at most one, and it's the LWP that
2920 the core is most interested in. If we didn't do this, then we'd
2921 have to handle pending step SIGTRAPs somehow in case the core
2922 later continues the previously-stepped thread, otherwise we'd
2923 report the pending SIGTRAP, and the core, not having stepped the
2924 thread, wouldn't understand what the trap was for, and therefore
2925 would report it to the user as a random signal. */
2929 = (struct thread_info
*) find_inferior (&all_threads
,
2930 select_singlestep_lwp_callback
,
2932 if (event_thread
!= NULL
)
2935 debug_printf ("SEL: Select single-step %s\n",
2936 target_pid_to_str (ptid_of (event_thread
)));
2939 if (event_thread
== NULL
)
2941 /* No single-stepping LWP. Select one at random, out of those
2942 which have had events. */
2944 /* First see how many events we have. */
2945 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2946 gdb_assert (num_events
> 0);
2948 /* Now randomly pick a LWP out of those that have had
2950 random_selector
= (int)
2951 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2953 if (debug_threads
&& num_events
> 1)
2954 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2955 num_events
, random_selector
);
2958 = (struct thread_info
*) find_inferior (&all_threads
,
2959 select_event_lwp_callback
,
2963 if (event_thread
!= NULL
)
2965 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2967 /* Switch the event LWP. */
2968 *orig_lp
= event_lp
;
2972 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2976 unsuspend_all_lwps (struct lwp_info
*except
)
2978 for_each_thread ([&] (thread_info
*thread
)
2980 lwp_info
*lwp
= get_thread_lwp (thread
);
2983 lwp_suspended_decr (lwp
);
2987 static void move_out_of_jump_pad_callback (thread_info
*thread
);
2988 static int stuck_in_jump_pad_callback (thread_info
*thread
, void *data
);
2989 static int lwp_running (thread_info
*thread
, void *data
);
2990 static ptid_t
linux_wait_1 (ptid_t ptid
,
2991 struct target_waitstatus
*ourstatus
,
2992 int target_options
);
2994 /* Stabilize threads (move out of jump pads).
2996 If a thread is midway collecting a fast tracepoint, we need to
2997 finish the collection and move it out of the jump pad before
2998 reporting the signal.
3000 This avoids recursion while collecting (when a signal arrives
3001 midway, and the signal handler itself collects), which would trash
3002 the trace buffer. In case the user set a breakpoint in a signal
3003 handler, this avoids the backtrace showing the jump pad, etc..
3004 Most importantly, there are certain things we can't do safely if
3005 threads are stopped in a jump pad (or in its callee's). For
3008 - starting a new trace run. A thread still collecting the
3009 previous run, could trash the trace buffer when resumed. The trace
3010 buffer control structures would have been reset but the thread had
3011 no way to tell. The thread could even midway memcpy'ing to the
3012 buffer, which would mean that when resumed, it would clobber the
3013 trace buffer that had been set for a new run.
3015 - we can't rewrite/reuse the jump pads for new tracepoints
3016 safely. Say you do tstart while a thread is stopped midway while
3017 collecting. When the thread is later resumed, it finishes the
3018 collection, and returns to the jump pad, to execute the original
3019 instruction that was under the tracepoint jump at the time the
3020 older run had been started. If the jump pad had been rewritten
3021 since for something else in the new run, the thread would now
3022 execute the wrong / random instructions. */
3025 linux_stabilize_threads (void)
3027 struct thread_info
*saved_thread
;
3028 struct thread_info
*thread_stuck
;
3031 = (struct thread_info
*) find_inferior (&all_threads
,
3032 stuck_in_jump_pad_callback
,
3034 if (thread_stuck
!= NULL
)
3037 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
3038 lwpid_of (thread_stuck
));
3042 saved_thread
= current_thread
;
3044 stabilizing_threads
= 1;
3047 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
3049 /* Loop until all are stopped out of the jump pads. */
3050 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
3052 struct target_waitstatus ourstatus
;
3053 struct lwp_info
*lwp
;
3056 /* Note that we go through the full wait even loop. While
3057 moving threads out of jump pad, we need to be able to step
3058 over internal breakpoints and such. */
3059 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
3061 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
3063 lwp
= get_thread_lwp (current_thread
);
3066 lwp_suspended_inc (lwp
);
3068 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3069 || current_thread
->last_resume_kind
== resume_stop
)
3071 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3072 enqueue_one_deferred_signal (lwp
, &wstat
);
3077 unsuspend_all_lwps (NULL
);
3079 stabilizing_threads
= 0;
3081 current_thread
= saved_thread
;
3086 = (struct thread_info
*) find_inferior (&all_threads
,
3087 stuck_in_jump_pad_callback
,
3089 if (thread_stuck
!= NULL
)
3090 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3091 lwpid_of (thread_stuck
));
3095 /* Convenience function that is called when the kernel reports an
3096 event that is not passed out to GDB. */
3099 ignore_event (struct target_waitstatus
*ourstatus
)
3101 /* If we got an event, there may still be others, as a single
3102 SIGCHLD can indicate more than one child stopped. This forces
3103 another target_wait call. */
3106 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3110 /* Convenience function that is called when the kernel reports an exit
3111 event. This decides whether to report the event to GDB as a
3112 process exit event, a thread exit event, or to suppress the
3116 filter_exit_event (struct lwp_info
*event_child
,
3117 struct target_waitstatus
*ourstatus
)
3119 struct thread_info
*thread
= get_lwp_thread (event_child
);
3120 ptid_t ptid
= ptid_of (thread
);
3122 if (!last_thread_of_process_p (pid_of (thread
)))
3124 if (report_thread_events
)
3125 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3127 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3129 delete_lwp (event_child
);
3134 /* Returns 1 if GDB is interested in any event_child syscalls. */
3137 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3139 struct thread_info
*thread
= get_lwp_thread (event_child
);
3140 struct process_info
*proc
= get_thread_process (thread
);
3142 return !proc
->syscalls_to_catch
.empty ();
3145 /* Returns 1 if GDB is interested in the event_child syscall.
3146 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3149 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3152 struct thread_info
*thread
= get_lwp_thread (event_child
);
3153 struct process_info
*proc
= get_thread_process (thread
);
3155 if (proc
->syscalls_to_catch
.empty ())
3158 if (proc
->syscalls_to_catch
[0] == ANY_SYSCALL
)
3161 get_syscall_trapinfo (event_child
, &sysno
);
3163 for (int iter
: proc
->syscalls_to_catch
)
3170 /* Wait for process, returns status. */
3173 linux_wait_1 (ptid_t ptid
,
3174 struct target_waitstatus
*ourstatus
, int target_options
)
3177 struct lwp_info
*event_child
;
3180 int step_over_finished
;
3181 int bp_explains_trap
;
3182 int maybe_internal_trap
;
3191 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3194 /* Translate generic target options into linux options. */
3196 if (target_options
& TARGET_WNOHANG
)
3199 bp_explains_trap
= 0;
3202 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3204 /* Find a resumed LWP, if any. */
3205 if (find_inferior (&all_threads
,
3206 status_pending_p_callback
,
3207 &minus_one_ptid
) != NULL
)
3209 else if ((find_inferior (&all_threads
,
3210 not_stopped_callback
,
3211 &minus_one_ptid
) != NULL
))
3216 if (ptid_equal (step_over_bkpt
, null_ptid
))
3217 pid
= linux_wait_for_event (ptid
, &w
, options
);
3221 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3222 target_pid_to_str (step_over_bkpt
));
3223 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3226 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3228 gdb_assert (target_options
& TARGET_WNOHANG
);
3232 debug_printf ("linux_wait_1 ret = null_ptid, "
3233 "TARGET_WAITKIND_IGNORE\n");
3237 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3244 debug_printf ("linux_wait_1 ret = null_ptid, "
3245 "TARGET_WAITKIND_NO_RESUMED\n");
3249 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3253 event_child
= get_thread_lwp (current_thread
);
3255 /* linux_wait_for_event only returns an exit status for the last
3256 child of a process. Report it. */
3257 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3261 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3262 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3266 debug_printf ("linux_wait_1 ret = %s, exited with "
3268 target_pid_to_str (ptid_of (current_thread
)),
3275 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3276 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3280 debug_printf ("linux_wait_1 ret = %s, terminated with "
3282 target_pid_to_str (ptid_of (current_thread
)),
3288 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3289 return filter_exit_event (event_child
, ourstatus
);
3291 return ptid_of (current_thread
);
3294 /* If step-over executes a breakpoint instruction, in the case of a
3295 hardware single step it means a gdb/gdbserver breakpoint had been
3296 planted on top of a permanent breakpoint, in the case of a software
3297 single step it may just mean that gdbserver hit the reinsert breakpoint.
3298 The PC has been adjusted by save_stop_reason to point at
3299 the breakpoint address.
3300 So in the case of the hardware single step advance the PC manually
3301 past the breakpoint and in the case of software single step advance only
3302 if it's not the single_step_breakpoint we are hitting.
3303 This avoids that a program would keep trapping a permanent breakpoint
3305 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3306 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3307 && (event_child
->stepping
3308 || !single_step_breakpoint_inserted_here (event_child
->stop_pc
)))
3310 int increment_pc
= 0;
3311 int breakpoint_kind
= 0;
3312 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3315 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3316 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3320 debug_printf ("step-over for %s executed software breakpoint\n",
3321 target_pid_to_str (ptid_of (current_thread
)));
3324 if (increment_pc
!= 0)
3326 struct regcache
*regcache
3327 = get_thread_regcache (current_thread
, 1);
3329 event_child
->stop_pc
+= increment_pc
;
3330 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3332 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3333 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3337 /* If this event was not handled before, and is not a SIGTRAP, we
3338 report it. SIGILL and SIGSEGV are also treated as traps in case
3339 a breakpoint is inserted at the current PC. If this target does
3340 not support internal breakpoints at all, we also report the
3341 SIGTRAP without further processing; it's of no concern to us. */
3343 = (supports_breakpoints ()
3344 && (WSTOPSIG (w
) == SIGTRAP
3345 || ((WSTOPSIG (w
) == SIGILL
3346 || WSTOPSIG (w
) == SIGSEGV
)
3347 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3349 if (maybe_internal_trap
)
3351 /* Handle anything that requires bookkeeping before deciding to
3352 report the event or continue waiting. */
3354 /* First check if we can explain the SIGTRAP with an internal
3355 breakpoint, or if we should possibly report the event to GDB.
3356 Do this before anything that may remove or insert a
3358 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3360 /* We have a SIGTRAP, possibly a step-over dance has just
3361 finished. If so, tweak the state machine accordingly,
3362 reinsert breakpoints and delete any single-step
3364 step_over_finished
= finish_step_over (event_child
);
3366 /* Now invoke the callbacks of any internal breakpoints there. */
3367 check_breakpoints (event_child
->stop_pc
);
3369 /* Handle tracepoint data collecting. This may overflow the
3370 trace buffer, and cause a tracing stop, removing
3372 trace_event
= handle_tracepoints (event_child
);
3374 if (bp_explains_trap
)
3377 debug_printf ("Hit a gdbserver breakpoint.\n");
3382 /* We have some other signal, possibly a step-over dance was in
3383 progress, and it should be cancelled too. */
3384 step_over_finished
= finish_step_over (event_child
);
3387 /* We have all the data we need. Either report the event to GDB, or
3388 resume threads and keep waiting for more. */
3390 /* If we're collecting a fast tracepoint, finish the collection and
3391 move out of the jump pad before delivering a signal. See
3392 linux_stabilize_threads. */
3395 && WSTOPSIG (w
) != SIGTRAP
3396 && supports_fast_tracepoints ()
3397 && agent_loaded_p ())
3400 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3401 "to defer or adjust it.\n",
3402 WSTOPSIG (w
), lwpid_of (current_thread
));
3404 /* Allow debugging the jump pad itself. */
3405 if (current_thread
->last_resume_kind
!= resume_step
3406 && maybe_move_out_of_jump_pad (event_child
, &w
))
3408 enqueue_one_deferred_signal (event_child
, &w
);
3411 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3412 WSTOPSIG (w
), lwpid_of (current_thread
));
3414 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3418 return ignore_event (ourstatus
);
3422 if (event_child
->collecting_fast_tracepoint
3423 != fast_tpoint_collect_result::not_collecting
)
3426 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3427 "Check if we're already there.\n",
3428 lwpid_of (current_thread
),
3429 (int) event_child
->collecting_fast_tracepoint
);
3433 event_child
->collecting_fast_tracepoint
3434 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3436 if (event_child
->collecting_fast_tracepoint
3437 != fast_tpoint_collect_result::before_insn
)
3439 /* No longer need this breakpoint. */
3440 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3443 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3444 "stopping all threads momentarily.\n");
3446 /* Other running threads could hit this breakpoint.
3447 We don't handle moribund locations like GDB does,
3448 instead we always pause all threads when removing
3449 breakpoints, so that any step-over or
3450 decr_pc_after_break adjustment is always taken
3451 care of while the breakpoint is still
3453 stop_all_lwps (1, event_child
);
3455 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3456 event_child
->exit_jump_pad_bkpt
= NULL
;
3458 unstop_all_lwps (1, event_child
);
3460 gdb_assert (event_child
->suspended
>= 0);
3464 if (event_child
->collecting_fast_tracepoint
3465 == fast_tpoint_collect_result::not_collecting
)
3468 debug_printf ("fast tracepoint finished "
3469 "collecting successfully.\n");
3471 /* We may have a deferred signal to report. */
3472 if (dequeue_one_deferred_signal (event_child
, &w
))
3475 debug_printf ("dequeued one signal.\n");
3480 debug_printf ("no deferred signals.\n");
3482 if (stabilizing_threads
)
3484 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3485 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3489 debug_printf ("linux_wait_1 ret = %s, stopped "
3490 "while stabilizing threads\n",
3491 target_pid_to_str (ptid_of (current_thread
)));
3495 return ptid_of (current_thread
);
3501 /* Check whether GDB would be interested in this event. */
3503 /* Check if GDB is interested in this syscall. */
3505 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3506 && !gdb_catch_this_syscall_p (event_child
))
3510 debug_printf ("Ignored syscall for LWP %ld.\n",
3511 lwpid_of (current_thread
));
3514 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3519 return ignore_event (ourstatus
);
3522 /* If GDB is not interested in this signal, don't stop other
3523 threads, and don't report it to GDB. Just resume the inferior
3524 right away. We do this for threading-related signals as well as
3525 any that GDB specifically requested we ignore. But never ignore
3526 SIGSTOP if we sent it ourselves, and do not ignore signals when
3527 stepping - they may require special handling to skip the signal
3528 handler. Also never ignore signals that could be caused by a
3531 && current_thread
->last_resume_kind
!= resume_step
3533 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3534 (current_process ()->priv
->thread_db
!= NULL
3535 && (WSTOPSIG (w
) == __SIGRTMIN
3536 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3539 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3540 && !(WSTOPSIG (w
) == SIGSTOP
3541 && current_thread
->last_resume_kind
== resume_stop
)
3542 && !linux_wstatus_maybe_breakpoint (w
))))
3544 siginfo_t info
, *info_p
;
3547 debug_printf ("Ignored signal %d for LWP %ld.\n",
3548 WSTOPSIG (w
), lwpid_of (current_thread
));
3550 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3551 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3556 if (step_over_finished
)
3558 /* We cancelled this thread's step-over above. We still
3559 need to unsuspend all other LWPs, and set them back
3560 running again while the signal handler runs. */
3561 unsuspend_all_lwps (event_child
);
3563 /* Enqueue the pending signal info so that proceed_all_lwps
3565 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3567 proceed_all_lwps ();
3571 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3572 WSTOPSIG (w
), info_p
);
3578 return ignore_event (ourstatus
);
3581 /* Note that all addresses are always "out of the step range" when
3582 there's no range to begin with. */
3583 in_step_range
= lwp_in_step_range (event_child
);
3585 /* If GDB wanted this thread to single step, and the thread is out
3586 of the step range, we always want to report the SIGTRAP, and let
3587 GDB handle it. Watchpoints should always be reported. So should
3588 signals we can't explain. A SIGTRAP we can't explain could be a
3589 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3590 do, we're be able to handle GDB breakpoints on top of internal
3591 breakpoints, by handling the internal breakpoint and still
3592 reporting the event to GDB. If we don't, we're out of luck, GDB
3593 won't see the breakpoint hit. If we see a single-step event but
3594 the thread should be continuing, don't pass the trap to gdb.
3595 That indicates that we had previously finished a single-step but
3596 left the single-step pending -- see
3597 complete_ongoing_step_over. */
3598 report_to_gdb
= (!maybe_internal_trap
3599 || (current_thread
->last_resume_kind
== resume_step
3601 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3603 && !bp_explains_trap
3605 && !step_over_finished
3606 && !(current_thread
->last_resume_kind
== resume_continue
3607 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3608 || (gdb_breakpoint_here (event_child
->stop_pc
)
3609 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3610 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3611 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3613 run_breakpoint_commands (event_child
->stop_pc
);
3615 /* We found no reason GDB would want us to stop. We either hit one
3616 of our own breakpoints, or finished an internal step GDB
3617 shouldn't know about. */
3622 if (bp_explains_trap
)
3623 debug_printf ("Hit a gdbserver breakpoint.\n");
3624 if (step_over_finished
)
3625 debug_printf ("Step-over finished.\n");
3627 debug_printf ("Tracepoint event.\n");
3628 if (lwp_in_step_range (event_child
))
3629 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3630 paddress (event_child
->stop_pc
),
3631 paddress (event_child
->step_range_start
),
3632 paddress (event_child
->step_range_end
));
3635 /* We're not reporting this breakpoint to GDB, so apply the
3636 decr_pc_after_break adjustment to the inferior's regcache
3639 if (the_low_target
.set_pc
!= NULL
)
3641 struct regcache
*regcache
3642 = get_thread_regcache (current_thread
, 1);
3643 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3646 if (step_over_finished
)
3648 /* If we have finished stepping over a breakpoint, we've
3649 stopped and suspended all LWPs momentarily except the
3650 stepping one. This is where we resume them all again.
3651 We're going to keep waiting, so use proceed, which
3652 handles stepping over the next breakpoint. */
3653 unsuspend_all_lwps (event_child
);
3657 /* Remove the single-step breakpoints if any. Note that
3658 there isn't single-step breakpoint if we finished stepping
3660 if (can_software_single_step ()
3661 && has_single_step_breakpoints (current_thread
))
3663 stop_all_lwps (0, event_child
);
3664 delete_single_step_breakpoints (current_thread
);
3665 unstop_all_lwps (0, event_child
);
3670 debug_printf ("proceeding all threads.\n");
3671 proceed_all_lwps ();
3676 return ignore_event (ourstatus
);
3681 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3684 = target_waitstatus_to_string (&event_child
->waitstatus
);
3686 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3687 lwpid_of (get_lwp_thread (event_child
)), str
.c_str ());
3689 if (current_thread
->last_resume_kind
== resume_step
)
3691 if (event_child
->step_range_start
== event_child
->step_range_end
)
3692 debug_printf ("GDB wanted to single-step, reporting event.\n");
3693 else if (!lwp_in_step_range (event_child
))
3694 debug_printf ("Out of step range, reporting event.\n");
3696 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3697 debug_printf ("Stopped by watchpoint.\n");
3698 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3699 debug_printf ("Stopped by GDB breakpoint.\n");
3701 debug_printf ("Hit a non-gdbserver trap event.\n");
3704 /* Alright, we're going to report a stop. */
3706 /* Remove single-step breakpoints. */
3707 if (can_software_single_step ())
3709 /* Remove single-step breakpoints or not. It it is true, stop all
3710 lwps, so that other threads won't hit the breakpoint in the
3712 int remove_single_step_breakpoints_p
= 0;
3716 remove_single_step_breakpoints_p
3717 = has_single_step_breakpoints (current_thread
);
3721 /* In all-stop, a stop reply cancels all previous resume
3722 requests. Delete all single-step breakpoints. */
3724 find_thread ([&] (thread_info
*thread
) {
3725 if (has_single_step_breakpoints (thread
))
3727 remove_single_step_breakpoints_p
= 1;
3735 if (remove_single_step_breakpoints_p
)
3737 /* If we remove single-step breakpoints from memory, stop all lwps,
3738 so that other threads won't hit the breakpoint in the staled
3740 stop_all_lwps (0, event_child
);
3744 gdb_assert (has_single_step_breakpoints (current_thread
));
3745 delete_single_step_breakpoints (current_thread
);
3749 for_each_thread ([] (thread_info
*thread
){
3750 if (has_single_step_breakpoints (thread
))
3751 delete_single_step_breakpoints (thread
);
3755 unstop_all_lwps (0, event_child
);
3759 if (!stabilizing_threads
)
3761 /* In all-stop, stop all threads. */
3763 stop_all_lwps (0, NULL
);
3765 if (step_over_finished
)
3769 /* If we were doing a step-over, all other threads but
3770 the stepping one had been paused in start_step_over,
3771 with their suspend counts incremented. We don't want
3772 to do a full unstop/unpause, because we're in
3773 all-stop mode (so we want threads stopped), but we
3774 still need to unsuspend the other threads, to
3775 decrement their `suspended' count back. */
3776 unsuspend_all_lwps (event_child
);
3780 /* If we just finished a step-over, then all threads had
3781 been momentarily paused. In all-stop, that's fine,
3782 we want threads stopped by now anyway. In non-stop,
3783 we need to re-resume threads that GDB wanted to be
3785 unstop_all_lwps (1, event_child
);
3789 /* If we're not waiting for a specific LWP, choose an event LWP
3790 from among those that have had events. Giving equal priority
3791 to all LWPs that have had events helps prevent
3793 if (ptid_equal (ptid
, minus_one_ptid
))
3795 event_child
->status_pending_p
= 1;
3796 event_child
->status_pending
= w
;
3798 select_event_lwp (&event_child
);
3800 /* current_thread and event_child must stay in sync. */
3801 current_thread
= get_lwp_thread (event_child
);
3803 event_child
->status_pending_p
= 0;
3804 w
= event_child
->status_pending
;
3808 /* Stabilize threads (move out of jump pads). */
3810 stabilize_threads ();
3814 /* If we just finished a step-over, then all threads had been
3815 momentarily paused. In all-stop, that's fine, we want
3816 threads stopped by now anyway. In non-stop, we need to
3817 re-resume threads that GDB wanted to be running. */
3818 if (step_over_finished
)
3819 unstop_all_lwps (1, event_child
);
3822 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3824 /* If the reported event is an exit, fork, vfork or exec, let
3827 /* Break the unreported fork relationship chain. */
3828 if (event_child
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
3829 || event_child
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
)
3831 event_child
->fork_relative
->fork_relative
= NULL
;
3832 event_child
->fork_relative
= NULL
;
3835 *ourstatus
= event_child
->waitstatus
;
3836 /* Clear the event lwp's waitstatus since we handled it already. */
3837 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3840 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3842 /* Now that we've selected our final event LWP, un-adjust its PC if
3843 it was a software breakpoint, and the client doesn't know we can
3844 adjust the breakpoint ourselves. */
3845 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3846 && !swbreak_feature
)
3848 int decr_pc
= the_low_target
.decr_pc_after_break
;
3852 struct regcache
*regcache
3853 = get_thread_regcache (current_thread
, 1);
3854 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3858 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3860 get_syscall_trapinfo (event_child
,
3861 &ourstatus
->value
.syscall_number
);
3862 ourstatus
->kind
= event_child
->syscall_state
;
3864 else if (current_thread
->last_resume_kind
== resume_stop
3865 && WSTOPSIG (w
) == SIGSTOP
)
3867 /* A thread that has been requested to stop by GDB with vCont;t,
3868 and it stopped cleanly, so report as SIG0. The use of
3869 SIGSTOP is an implementation detail. */
3870 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3872 else if (current_thread
->last_resume_kind
== resume_stop
3873 && WSTOPSIG (w
) != SIGSTOP
)
3875 /* A thread that has been requested to stop by GDB with vCont;t,
3876 but, it stopped for other reasons. */
3877 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3879 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3881 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3884 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3888 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3889 target_pid_to_str (ptid_of (current_thread
)),
3890 ourstatus
->kind
, ourstatus
->value
.sig
);
3894 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3895 return filter_exit_event (event_child
, ourstatus
);
3897 return ptid_of (current_thread
);
3900 /* Get rid of any pending event in the pipe. */
3902 async_file_flush (void)
3908 ret
= read (linux_event_pipe
[0], &buf
, 1);
3909 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3912 /* Put something in the pipe, so the event loop wakes up. */
3914 async_file_mark (void)
3918 async_file_flush ();
3921 ret
= write (linux_event_pipe
[1], "+", 1);
3922 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3924 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3925 be awakened anyway. */
3929 linux_wait (ptid_t ptid
,
3930 struct target_waitstatus
*ourstatus
, int target_options
)
3934 /* Flush the async file first. */
3935 if (target_is_async_p ())
3936 async_file_flush ();
3940 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3942 while ((target_options
& TARGET_WNOHANG
) == 0
3943 && ptid_equal (event_ptid
, null_ptid
)
3944 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3946 /* If at least one stop was reported, there may be more. A single
3947 SIGCHLD can signal more than one child stop. */
3948 if (target_is_async_p ()
3949 && (target_options
& TARGET_WNOHANG
) != 0
3950 && !ptid_equal (event_ptid
, null_ptid
))
3956 /* Send a signal to an LWP. */
3959 kill_lwp (unsigned long lwpid
, int signo
)
3964 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3965 if (errno
== ENOSYS
)
3967 /* If tkill fails, then we are not using nptl threads, a
3968 configuration we no longer support. */
3969 perror_with_name (("tkill"));
3975 linux_stop_lwp (struct lwp_info
*lwp
)
3981 send_sigstop (struct lwp_info
*lwp
)
3985 pid
= lwpid_of (get_lwp_thread (lwp
));
3987 /* If we already have a pending stop signal for this process, don't
3989 if (lwp
->stop_expected
)
3992 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3998 debug_printf ("Sending sigstop to lwp %d\n", pid
);
4000 lwp
->stop_expected
= 1;
4001 kill_lwp (pid
, SIGSTOP
);
4005 send_sigstop_callback (thread_info
*thread
, void *except
)
4007 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4009 /* Ignore EXCEPT. */
4020 /* Increment the suspend count of an LWP, and stop it, if not stopped
4023 suspend_and_send_sigstop_callback (thread_info
*thread
, void *except
)
4025 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4027 /* Ignore EXCEPT. */
4031 lwp_suspended_inc (lwp
);
4033 return send_sigstop_callback (thread
, except
);
4037 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
4039 /* Store the exit status for later. */
4040 lwp
->status_pending_p
= 1;
4041 lwp
->status_pending
= wstat
;
4043 /* Store in waitstatus as well, as there's nothing else to process
4045 if (WIFEXITED (wstat
))
4047 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
4048 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
4050 else if (WIFSIGNALED (wstat
))
4052 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
4053 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
4056 /* Prevent trying to stop it. */
4059 /* No further stops are expected from a dead lwp. */
4060 lwp
->stop_expected
= 0;
4063 /* Return true if LWP has exited already, and has a pending exit event
4064 to report to GDB. */
4067 lwp_is_marked_dead (struct lwp_info
*lwp
)
4069 return (lwp
->status_pending_p
4070 && (WIFEXITED (lwp
->status_pending
)
4071 || WIFSIGNALED (lwp
->status_pending
)));
4074 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4077 wait_for_sigstop (void)
4079 struct thread_info
*saved_thread
;
4084 saved_thread
= current_thread
;
4085 if (saved_thread
!= NULL
)
4086 saved_tid
= saved_thread
->id
;
4088 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4091 debug_printf ("wait_for_sigstop: pulling events\n");
4093 /* Passing NULL_PTID as filter indicates we want all events to be
4094 left pending. Eventually this returns when there are no
4095 unwaited-for children left. */
4096 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4098 gdb_assert (ret
== -1);
4100 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4101 current_thread
= saved_thread
;
4105 debug_printf ("Previously current thread died.\n");
4107 /* We can't change the current inferior behind GDB's back,
4108 otherwise, a subsequent command may apply to the wrong
4110 current_thread
= NULL
;
4114 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
4115 move it out, because we need to report the stop event to GDB. For
4116 example, if the user puts a breakpoint in the jump pad, it's
4117 because she wants to debug it. */
4120 stuck_in_jump_pad_callback (thread_info
*thread
, void *data
)
4122 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 /* Allow debugging the jump pad, gdb_collect, etc.. */
4133 return (supports_fast_tracepoints ()
4134 && agent_loaded_p ()
4135 && (gdb_breakpoint_here (lwp
->stop_pc
)
4136 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4137 || thread
->last_resume_kind
== resume_step
)
4138 && (linux_fast_tracepoint_collecting (lwp
, NULL
)
4139 != fast_tpoint_collect_result::not_collecting
));
4143 move_out_of_jump_pad_callback (thread_info
*thread
)
4145 struct thread_info
*saved_thread
;
4146 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4149 if (lwp
->suspended
!= 0)
4151 internal_error (__FILE__
, __LINE__
,
4152 "LWP %ld is suspended, suspended=%d\n",
4153 lwpid_of (thread
), lwp
->suspended
);
4155 gdb_assert (lwp
->stopped
);
4157 /* For gdb_breakpoint_here. */
4158 saved_thread
= current_thread
;
4159 current_thread
= thread
;
4161 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4163 /* Allow debugging the jump pad, gdb_collect, etc. */
4164 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4165 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4166 && thread
->last_resume_kind
!= resume_step
4167 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4170 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4175 lwp
->status_pending_p
= 0;
4176 enqueue_one_deferred_signal (lwp
, wstat
);
4179 debug_printf ("Signal %d for LWP %ld deferred "
4181 WSTOPSIG (*wstat
), lwpid_of (thread
));
4184 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4187 lwp_suspended_inc (lwp
);
4189 current_thread
= saved_thread
;
4193 lwp_running (thread_info
*thread
, void *data
)
4195 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4197 if (lwp_is_marked_dead (lwp
))
4204 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4205 If SUSPEND, then also increase the suspend count of every LWP,
4209 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4211 /* Should not be called recursively. */
4212 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4217 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4218 suspend
? "stop-and-suspend" : "stop",
4220 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4224 stopping_threads
= (suspend
4225 ? STOPPING_AND_SUSPENDING_THREADS
4226 : STOPPING_THREADS
);
4229 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
4231 find_inferior (&all_threads
, send_sigstop_callback
, except
);
4232 wait_for_sigstop ();
4233 stopping_threads
= NOT_STOPPING_THREADS
;
4237 debug_printf ("stop_all_lwps done, setting stopping_threads "
4238 "back to !stopping\n");
4243 /* Enqueue one signal in the chain of signals which need to be
4244 delivered to this process on next resume. */
4247 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4249 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4251 p_sig
->prev
= lwp
->pending_signals
;
4252 p_sig
->signal
= signal
;
4254 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4256 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4257 lwp
->pending_signals
= p_sig
;
4260 /* Install breakpoints for software single stepping. */
4263 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4265 struct thread_info
*thread
= get_lwp_thread (lwp
);
4266 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4267 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
4269 current_thread
= thread
;
4270 std::vector
<CORE_ADDR
> next_pcs
= the_low_target
.get_next_pcs (regcache
);
4272 for (CORE_ADDR pc
: next_pcs
)
4273 set_single_step_breakpoint (pc
, current_ptid
);
4275 do_cleanups (old_chain
);
4278 /* Single step via hardware or software single step.
4279 Return 1 if hardware single stepping, 0 if software single stepping
4280 or can't single step. */
4283 single_step (struct lwp_info
* lwp
)
4287 if (can_hardware_single_step ())
4291 else if (can_software_single_step ())
4293 install_software_single_step_breakpoints (lwp
);
4299 debug_printf ("stepping is not implemented on this target");
4305 /* The signal can be delivered to the inferior if we are not trying to
4306 finish a fast tracepoint collect. Since signal can be delivered in
4307 the step-over, the program may go to signal handler and trap again
4308 after return from the signal handler. We can live with the spurious
4312 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4314 return (lwp
->collecting_fast_tracepoint
4315 == fast_tpoint_collect_result::not_collecting
);
4318 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4319 SIGNAL is nonzero, give it that signal. */
4322 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4323 int step
, int signal
, siginfo_t
*info
)
4325 struct thread_info
*thread
= get_lwp_thread (lwp
);
4326 struct thread_info
*saved_thread
;
4328 struct process_info
*proc
= get_thread_process (thread
);
4330 /* Note that target description may not be initialised
4331 (proc->tdesc == NULL) at this point because the program hasn't
4332 stopped at the first instruction yet. It means GDBserver skips
4333 the extra traps from the wrapper program (see option --wrapper).
4334 Code in this function that requires register access should be
4335 guarded by proc->tdesc == NULL or something else. */
4337 if (lwp
->stopped
== 0)
4340 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4342 fast_tpoint_collect_result fast_tp_collecting
4343 = lwp
->collecting_fast_tracepoint
;
4345 gdb_assert (!stabilizing_threads
4346 || (fast_tp_collecting
4347 != fast_tpoint_collect_result::not_collecting
));
4349 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4350 user used the "jump" command, or "set $pc = foo"). */
4351 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4353 /* Collecting 'while-stepping' actions doesn't make sense
4355 release_while_stepping_state_list (thread
);
4358 /* If we have pending signals or status, and a new signal, enqueue the
4359 signal. Also enqueue the signal if it can't be delivered to the
4360 inferior right now. */
4362 && (lwp
->status_pending_p
4363 || lwp
->pending_signals
!= NULL
4364 || !lwp_signal_can_be_delivered (lwp
)))
4366 enqueue_pending_signal (lwp
, signal
, info
);
4368 /* Postpone any pending signal. It was enqueued above. */
4372 if (lwp
->status_pending_p
)
4375 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4376 " has pending status\n",
4377 lwpid_of (thread
), step
? "step" : "continue",
4378 lwp
->stop_expected
? "expected" : "not expected");
4382 saved_thread
= current_thread
;
4383 current_thread
= thread
;
4385 /* This bit needs some thinking about. If we get a signal that
4386 we must report while a single-step reinsert is still pending,
4387 we often end up resuming the thread. It might be better to
4388 (ew) allow a stack of pending events; then we could be sure that
4389 the reinsert happened right away and not lose any signals.
4391 Making this stack would also shrink the window in which breakpoints are
4392 uninserted (see comment in linux_wait_for_lwp) but not enough for
4393 complete correctness, so it won't solve that problem. It may be
4394 worthwhile just to solve this one, however. */
4395 if (lwp
->bp_reinsert
!= 0)
4398 debug_printf (" pending reinsert at 0x%s\n",
4399 paddress (lwp
->bp_reinsert
));
4401 if (can_hardware_single_step ())
4403 if (fast_tp_collecting
== fast_tpoint_collect_result::not_collecting
)
4406 warning ("BAD - reinserting but not stepping.");
4408 warning ("BAD - reinserting and suspended(%d).",
4413 step
= maybe_hw_step (thread
);
4416 if (fast_tp_collecting
== fast_tpoint_collect_result::before_insn
)
4419 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4420 " (exit-jump-pad-bkpt)\n",
4423 else if (fast_tp_collecting
== fast_tpoint_collect_result::at_insn
)
4426 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4427 " single-stepping\n",
4430 if (can_hardware_single_step ())
4434 internal_error (__FILE__
, __LINE__
,
4435 "moving out of jump pad single-stepping"
4436 " not implemented on this target");
4440 /* If we have while-stepping actions in this thread set it stepping.
4441 If we have a signal to deliver, it may or may not be set to
4442 SIG_IGN, we don't know. Assume so, and allow collecting
4443 while-stepping into a signal handler. A possible smart thing to
4444 do would be to set an internal breakpoint at the signal return
4445 address, continue, and carry on catching this while-stepping
4446 action only when that breakpoint is hit. A future
4448 if (thread
->while_stepping
!= NULL
)
4451 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4454 step
= single_step (lwp
);
4457 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4459 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4461 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4465 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4466 (long) lwp
->stop_pc
);
4470 /* If we have pending signals, consume one if it can be delivered to
4472 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4474 struct pending_signals
**p_sig
;
4476 p_sig
= &lwp
->pending_signals
;
4477 while ((*p_sig
)->prev
!= NULL
)
4478 p_sig
= &(*p_sig
)->prev
;
4480 signal
= (*p_sig
)->signal
;
4481 if ((*p_sig
)->info
.si_signo
!= 0)
4482 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4490 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4491 lwpid_of (thread
), step
? "step" : "continue", signal
,
4492 lwp
->stop_expected
? "expected" : "not expected");
4494 if (the_low_target
.prepare_to_resume
!= NULL
)
4495 the_low_target
.prepare_to_resume (lwp
);
4497 regcache_invalidate_thread (thread
);
4499 lwp
->stepping
= step
;
4501 ptrace_request
= PTRACE_SINGLESTEP
;
4502 else if (gdb_catching_syscalls_p (lwp
))
4503 ptrace_request
= PTRACE_SYSCALL
;
4505 ptrace_request
= PTRACE_CONT
;
4506 ptrace (ptrace_request
,
4508 (PTRACE_TYPE_ARG3
) 0,
4509 /* Coerce to a uintptr_t first to avoid potential gcc warning
4510 of coercing an 8 byte integer to a 4 byte pointer. */
4511 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4513 current_thread
= saved_thread
;
4515 perror_with_name ("resuming thread");
4517 /* Successfully resumed. Clear state that no longer makes sense,
4518 and mark the LWP as running. Must not do this before resuming
4519 otherwise if that fails other code will be confused. E.g., we'd
4520 later try to stop the LWP and hang forever waiting for a stop
4521 status. Note that we must not throw after this is cleared,
4522 otherwise handle_zombie_lwp_error would get confused. */
4524 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4527 /* Called when we try to resume a stopped LWP and that errors out. If
4528 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4529 or about to become), discard the error, clear any pending status
4530 the LWP may have, and return true (we'll collect the exit status
4531 soon enough). Otherwise, return false. */
4534 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4536 struct thread_info
*thread
= get_lwp_thread (lp
);
4538 /* If we get an error after resuming the LWP successfully, we'd
4539 confuse !T state for the LWP being gone. */
4540 gdb_assert (lp
->stopped
);
4542 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4543 because even if ptrace failed with ESRCH, the tracee may be "not
4544 yet fully dead", but already refusing ptrace requests. In that
4545 case the tracee has 'R (Running)' state for a little bit
4546 (observed in Linux 3.18). See also the note on ESRCH in the
4547 ptrace(2) man page. Instead, check whether the LWP has any state
4548 other than ptrace-stopped. */
4550 /* Don't assume anything if /proc/PID/status can't be read. */
4551 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4553 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4554 lp
->status_pending_p
= 0;
4560 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4561 disappears while we try to resume it. */
4564 linux_resume_one_lwp (struct lwp_info
*lwp
,
4565 int step
, int signal
, siginfo_t
*info
)
4569 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4571 CATCH (ex
, RETURN_MASK_ERROR
)
4573 if (!check_ptrace_stopped_lwp_gone (lwp
))
4574 throw_exception (ex
);
4579 struct thread_resume_array
4581 struct thread_resume
*resume
;
4585 /* This function is called once per thread via find_inferior.
4586 ARG is a pointer to a thread_resume_array struct.
4587 We look up the thread specified by ENTRY in ARG, and mark the thread
4588 with a pointer to the appropriate resume request.
4590 This algorithm is O(threads * resume elements), but resume elements
4591 is small (and will remain small at least until GDB supports thread
4595 linux_set_resume_request (thread_info
*thread
, void *arg
)
4597 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4599 struct thread_resume_array
*r
;
4601 r
= (struct thread_resume_array
*) arg
;
4603 for (ndx
= 0; ndx
< r
->n
; ndx
++)
4605 ptid_t ptid
= r
->resume
[ndx
].thread
;
4606 if (ptid_equal (ptid
, minus_one_ptid
)
4607 || ptid
== thread
->id
4608 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4610 || (ptid_get_pid (ptid
) == pid_of (thread
)
4611 && (ptid_is_pid (ptid
)
4612 || ptid_get_lwp (ptid
) == -1)))
4614 if (r
->resume
[ndx
].kind
== resume_stop
4615 && thread
->last_resume_kind
== resume_stop
)
4618 debug_printf ("already %s LWP %ld at GDB's request\n",
4619 (thread
->last_status
.kind
4620 == TARGET_WAITKIND_STOPPED
)
4628 /* Ignore (wildcard) resume requests for already-resumed
4630 if (r
->resume
[ndx
].kind
!= resume_stop
4631 && thread
->last_resume_kind
!= resume_stop
)
4634 debug_printf ("already %s LWP %ld at GDB's request\n",
4635 (thread
->last_resume_kind
4643 /* Don't let wildcard resumes resume fork children that GDB
4644 does not yet know are new fork children. */
4645 if (lwp
->fork_relative
!= NULL
)
4647 struct lwp_info
*rel
= lwp
->fork_relative
;
4649 if (rel
->status_pending_p
4650 && (rel
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
4651 || rel
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
))
4654 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4660 /* If the thread has a pending event that has already been
4661 reported to GDBserver core, but GDB has not pulled the
4662 event out of the vStopped queue yet, likewise, ignore the
4663 (wildcard) resume request. */
4664 if (in_queued_stop_replies (thread
->id
))
4667 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4672 lwp
->resume
= &r
->resume
[ndx
];
4673 thread
->last_resume_kind
= lwp
->resume
->kind
;
4675 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4676 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4678 /* If we had a deferred signal to report, dequeue one now.
4679 This can happen if LWP gets more than one signal while
4680 trying to get out of a jump pad. */
4682 && !lwp
->status_pending_p
4683 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4685 lwp
->status_pending_p
= 1;
4688 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4689 "leaving status pending.\n",
4690 WSTOPSIG (lwp
->status_pending
),
4698 /* No resume action for this thread. */
4704 /* find_inferior callback for linux_resume.
4705 Set *FLAG_P if this lwp has an interesting status pending. */
4708 resume_status_pending_p (thread_info
*thread
, void *flag_p
)
4710 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4712 /* LWPs which will not be resumed are not interesting, because
4713 we might not wait for them next time through linux_wait. */
4714 if (lwp
->resume
== NULL
)
4717 if (thread_still_has_status_pending_p (thread
))
4718 * (int *) flag_p
= 1;
4723 /* Return 1 if this lwp that GDB wants running is stopped at an
4724 internal breakpoint that we need to step over. It assumes that any
4725 required STOP_PC adjustment has already been propagated to the
4726 inferior's regcache. */
4729 need_step_over_p (thread_info
*thread
, void *dummy
)
4731 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4732 struct thread_info
*saved_thread
;
4734 struct process_info
*proc
= get_thread_process (thread
);
4736 /* GDBserver is skipping the extra traps from the wrapper program,
4737 don't have to do step over. */
4738 if (proc
->tdesc
== NULL
)
4741 /* LWPs which will not be resumed are not interesting, because we
4742 might not wait for them next time through linux_wait. */
4747 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4752 if (thread
->last_resume_kind
== resume_stop
)
4755 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4761 gdb_assert (lwp
->suspended
>= 0);
4766 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4771 if (lwp
->status_pending_p
)
4774 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4780 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4784 /* If the PC has changed since we stopped, then don't do anything,
4785 and let the breakpoint/tracepoint be hit. This happens if, for
4786 instance, GDB handled the decr_pc_after_break subtraction itself,
4787 GDB is OOL stepping this thread, or the user has issued a "jump"
4788 command, or poked thread's registers herself. */
4789 if (pc
!= lwp
->stop_pc
)
4792 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4793 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4795 paddress (lwp
->stop_pc
), paddress (pc
));
4799 /* On software single step target, resume the inferior with signal
4800 rather than stepping over. */
4801 if (can_software_single_step ()
4802 && lwp
->pending_signals
!= NULL
4803 && lwp_signal_can_be_delivered (lwp
))
4806 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4813 saved_thread
= current_thread
;
4814 current_thread
= thread
;
4816 /* We can only step over breakpoints we know about. */
4817 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4819 /* Don't step over a breakpoint that GDB expects to hit
4820 though. If the condition is being evaluated on the target's side
4821 and it evaluate to false, step over this breakpoint as well. */
4822 if (gdb_breakpoint_here (pc
)
4823 && gdb_condition_true_at_breakpoint (pc
)
4824 && gdb_no_commands_at_breakpoint (pc
))
4827 debug_printf ("Need step over [LWP %ld]? yes, but found"
4828 " GDB breakpoint at 0x%s; skipping step over\n",
4829 lwpid_of (thread
), paddress (pc
));
4831 current_thread
= saved_thread
;
4837 debug_printf ("Need step over [LWP %ld]? yes, "
4838 "found breakpoint at 0x%s\n",
4839 lwpid_of (thread
), paddress (pc
));
4841 /* We've found an lwp that needs stepping over --- return 1 so
4842 that find_inferior stops looking. */
4843 current_thread
= saved_thread
;
4849 current_thread
= saved_thread
;
4852 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4854 lwpid_of (thread
), paddress (pc
));
4859 /* Start a step-over operation on LWP. When LWP stopped at a
4860 breakpoint, to make progress, we need to remove the breakpoint out
4861 of the way. If we let other threads run while we do that, they may
4862 pass by the breakpoint location and miss hitting it. To avoid
4863 that, a step-over momentarily stops all threads while LWP is
4864 single-stepped by either hardware or software while the breakpoint
4865 is temporarily uninserted from the inferior. When the single-step
4866 finishes, we reinsert the breakpoint, and let all threads that are
4867 supposed to be running, run again. */
4870 start_step_over (struct lwp_info
*lwp
)
4872 struct thread_info
*thread
= get_lwp_thread (lwp
);
4873 struct thread_info
*saved_thread
;
4878 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4881 stop_all_lwps (1, lwp
);
4883 if (lwp
->suspended
!= 0)
4885 internal_error (__FILE__
, __LINE__
,
4886 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4891 debug_printf ("Done stopping all threads for step-over.\n");
4893 /* Note, we should always reach here with an already adjusted PC,
4894 either by GDB (if we're resuming due to GDB's request), or by our
4895 caller, if we just finished handling an internal breakpoint GDB
4896 shouldn't care about. */
4899 saved_thread
= current_thread
;
4900 current_thread
= thread
;
4902 lwp
->bp_reinsert
= pc
;
4903 uninsert_breakpoints_at (pc
);
4904 uninsert_fast_tracepoint_jumps_at (pc
);
4906 step
= single_step (lwp
);
4908 current_thread
= saved_thread
;
4910 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4912 /* Require next event from this LWP. */
4913 step_over_bkpt
= thread
->id
;
4917 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4918 start_step_over, if still there, and delete any single-step
4919 breakpoints we've set, on non hardware single-step targets. */
4922 finish_step_over (struct lwp_info
*lwp
)
4924 if (lwp
->bp_reinsert
!= 0)
4926 struct thread_info
*saved_thread
= current_thread
;
4929 debug_printf ("Finished step over.\n");
4931 current_thread
= get_lwp_thread (lwp
);
4933 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4934 may be no breakpoint to reinsert there by now. */
4935 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4936 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4938 lwp
->bp_reinsert
= 0;
4940 /* Delete any single-step breakpoints. No longer needed. We
4941 don't have to worry about other threads hitting this trap,
4942 and later not being able to explain it, because we were
4943 stepping over a breakpoint, and we hold all threads but
4944 LWP stopped while doing that. */
4945 if (!can_hardware_single_step ())
4947 gdb_assert (has_single_step_breakpoints (current_thread
));
4948 delete_single_step_breakpoints (current_thread
);
4951 step_over_bkpt
= null_ptid
;
4952 current_thread
= saved_thread
;
4959 /* If there's a step over in progress, wait until all threads stop
4960 (that is, until the stepping thread finishes its step), and
4961 unsuspend all lwps. The stepping thread ends with its status
4962 pending, which is processed later when we get back to processing
4966 complete_ongoing_step_over (void)
4968 if (!ptid_equal (step_over_bkpt
, null_ptid
))
4970 struct lwp_info
*lwp
;
4975 debug_printf ("detach: step over in progress, finish it first\n");
4977 /* Passing NULL_PTID as filter indicates we want all events to
4978 be left pending. Eventually this returns when there are no
4979 unwaited-for children left. */
4980 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4982 gdb_assert (ret
== -1);
4984 lwp
= find_lwp_pid (step_over_bkpt
);
4986 finish_step_over (lwp
);
4987 step_over_bkpt
= null_ptid
;
4988 unsuspend_all_lwps (lwp
);
4992 /* This function is called once per thread. We check the thread's resume
4993 request, which will tell us whether to resume, step, or leave the thread
4994 stopped; and what signal, if any, it should be sent.
4996 For threads which we aren't explicitly told otherwise, we preserve
4997 the stepping flag; this is used for stepping over gdbserver-placed
5000 If pending_flags was set in any thread, we queue any needed
5001 signals, since we won't actually resume. We already have a pending
5002 event to report, so we don't need to preserve any step requests;
5003 they should be re-issued if necessary. */
5006 linux_resume_one_thread (thread_info
*thread
, void *arg
)
5008 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5009 int leave_all_stopped
= * (int *) arg
;
5012 if (lwp
->resume
== NULL
)
5015 if (lwp
->resume
->kind
== resume_stop
)
5018 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
5023 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
5025 /* Stop the thread, and wait for the event asynchronously,
5026 through the event loop. */
5032 debug_printf ("already stopped LWP %ld\n",
5035 /* The LWP may have been stopped in an internal event that
5036 was not meant to be notified back to GDB (e.g., gdbserver
5037 breakpoint), so we should be reporting a stop event in
5040 /* If the thread already has a pending SIGSTOP, this is a
5041 no-op. Otherwise, something later will presumably resume
5042 the thread and this will cause it to cancel any pending
5043 operation, due to last_resume_kind == resume_stop. If
5044 the thread already has a pending status to report, we
5045 will still report it the next time we wait - see
5046 status_pending_p_callback. */
5048 /* If we already have a pending signal to report, then
5049 there's no need to queue a SIGSTOP, as this means we're
5050 midway through moving the LWP out of the jumppad, and we
5051 will report the pending signal as soon as that is
5053 if (lwp
->pending_signals_to_report
== NULL
)
5057 /* For stop requests, we're done. */
5059 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5063 /* If this thread which is about to be resumed has a pending status,
5064 then don't resume it - we can just report the pending status.
5065 Likewise if it is suspended, because e.g., another thread is
5066 stepping past a breakpoint. Make sure to queue any signals that
5067 would otherwise be sent. In all-stop mode, we do this decision
5068 based on if *any* thread has a pending status. If there's a
5069 thread that needs the step-over-breakpoint dance, then don't
5070 resume any other thread but that particular one. */
5071 leave_pending
= (lwp
->suspended
5072 || lwp
->status_pending_p
5073 || leave_all_stopped
);
5075 /* If we have a new signal, enqueue the signal. */
5076 if (lwp
->resume
->sig
!= 0)
5078 siginfo_t info
, *info_p
;
5080 /* If this is the same signal we were previously stopped by,
5081 make sure to queue its siginfo. */
5082 if (WIFSTOPPED (lwp
->last_status
)
5083 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
5084 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
5085 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
5090 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
5096 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
5098 proceed_one_lwp (thread
, NULL
);
5103 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5106 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5112 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5114 struct thread_resume_array array
= { resume_info
, n
};
5115 struct thread_info
*need_step_over
= NULL
;
5117 int leave_all_stopped
;
5122 debug_printf ("linux_resume:\n");
5125 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
5127 /* If there is a thread which would otherwise be resumed, which has
5128 a pending status, then don't resume any threads - we can just
5129 report the pending status. Make sure to queue any signals that
5130 would otherwise be sent. In non-stop mode, we'll apply this
5131 logic to each thread individually. We consume all pending events
5132 before considering to start a step-over (in all-stop). */
5135 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
5137 /* If there is a thread which would otherwise be resumed, which is
5138 stopped at a breakpoint that needs stepping over, then don't
5139 resume any threads - have it step over the breakpoint with all
5140 other threads stopped, then resume all threads again. Make sure
5141 to queue any signals that would otherwise be delivered or
5143 if (!any_pending
&& supports_breakpoints ())
5145 = (struct thread_info
*) find_inferior (&all_threads
,
5146 need_step_over_p
, NULL
);
5148 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5152 if (need_step_over
!= NULL
)
5153 debug_printf ("Not resuming all, need step over\n");
5154 else if (any_pending
)
5155 debug_printf ("Not resuming, all-stop and found "
5156 "an LWP with pending status\n");
5158 debug_printf ("Resuming, no pending status or step over needed\n");
5161 /* Even if we're leaving threads stopped, queue all signals we'd
5162 otherwise deliver. */
5163 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
5166 start_step_over (get_thread_lwp (need_step_over
));
5170 debug_printf ("linux_resume done\n");
5174 /* We may have events that were pending that can/should be sent to
5175 the client now. Trigger a linux_wait call. */
5176 if (target_is_async_p ())
5180 /* This function is called once per thread. We check the thread's
5181 last resume request, which will tell us whether to resume, step, or
5182 leave the thread stopped. Any signal the client requested to be
5183 delivered has already been enqueued at this point.
5185 If any thread that GDB wants running is stopped at an internal
5186 breakpoint that needs stepping over, we start a step-over operation
5187 on that particular thread, and leave all others stopped. */
5190 proceed_one_lwp (thread_info
*thread
, void *except
)
5192 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5199 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5204 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5208 if (thread
->last_resume_kind
== resume_stop
5209 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5212 debug_printf (" client wants LWP to remain %ld stopped\n",
5217 if (lwp
->status_pending_p
)
5220 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5225 gdb_assert (lwp
->suspended
>= 0);
5230 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5234 if (thread
->last_resume_kind
== resume_stop
5235 && lwp
->pending_signals_to_report
== NULL
5236 && (lwp
->collecting_fast_tracepoint
5237 == fast_tpoint_collect_result::not_collecting
))
5239 /* We haven't reported this LWP as stopped yet (otherwise, the
5240 last_status.kind check above would catch it, and we wouldn't
5241 reach here. This LWP may have been momentarily paused by a
5242 stop_all_lwps call while handling for example, another LWP's
5243 step-over. In that case, the pending expected SIGSTOP signal
5244 that was queued at vCont;t handling time will have already
5245 been consumed by wait_for_sigstop, and so we need to requeue
5246 another one here. Note that if the LWP already has a SIGSTOP
5247 pending, this is a no-op. */
5250 debug_printf ("Client wants LWP %ld to stop. "
5251 "Making sure it has a SIGSTOP pending\n",
5257 if (thread
->last_resume_kind
== resume_step
)
5260 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5263 /* If resume_step is requested by GDB, install single-step
5264 breakpoints when the thread is about to be actually resumed if
5265 the single-step breakpoints weren't removed. */
5266 if (can_software_single_step ()
5267 && !has_single_step_breakpoints (thread
))
5268 install_software_single_step_breakpoints (lwp
);
5270 step
= maybe_hw_step (thread
);
5272 else if (lwp
->bp_reinsert
!= 0)
5275 debug_printf (" stepping LWP %ld, reinsert set\n",
5278 step
= maybe_hw_step (thread
);
5283 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5288 unsuspend_and_proceed_one_lwp (thread_info
*thread
, void *except
)
5290 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5295 lwp_suspended_decr (lwp
);
5297 return proceed_one_lwp (thread
, except
);
5300 /* When we finish a step-over, set threads running again. If there's
5301 another thread that may need a step-over, now's the time to start
5302 it. Eventually, we'll move all threads past their breakpoints. */
5305 proceed_all_lwps (void)
5307 struct thread_info
*need_step_over
;
5309 /* If there is a thread which would otherwise be resumed, which is
5310 stopped at a breakpoint that needs stepping over, then don't
5311 resume any threads - have it step over the breakpoint with all
5312 other threads stopped, then resume all threads again. */
5314 if (supports_breakpoints ())
5317 = (struct thread_info
*) find_inferior (&all_threads
,
5318 need_step_over_p
, NULL
);
5320 if (need_step_over
!= NULL
)
5323 debug_printf ("proceed_all_lwps: found "
5324 "thread %ld needing a step-over\n",
5325 lwpid_of (need_step_over
));
5327 start_step_over (get_thread_lwp (need_step_over
));
5333 debug_printf ("Proceeding, no step-over needed\n");
5335 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
5338 /* Stopped LWPs that the client wanted to be running, that don't have
5339 pending statuses, are set to run again, except for EXCEPT, if not
5340 NULL. This undoes a stop_all_lwps call. */
5343 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5349 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5350 lwpid_of (get_lwp_thread (except
)));
5352 debug_printf ("unstopping all lwps\n");
5356 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
5358 find_inferior (&all_threads
, proceed_one_lwp
, except
);
5362 debug_printf ("unstop_all_lwps done\n");
5368 #ifdef HAVE_LINUX_REGSETS
5370 #define use_linux_regsets 1
5372 /* Returns true if REGSET has been disabled. */
5375 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5377 return (info
->disabled_regsets
!= NULL
5378 && info
->disabled_regsets
[regset
- info
->regsets
]);
5381 /* Disable REGSET. */
5384 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5388 dr_offset
= regset
- info
->regsets
;
5389 if (info
->disabled_regsets
== NULL
)
5390 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5391 info
->disabled_regsets
[dr_offset
] = 1;
5395 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5396 struct regcache
*regcache
)
5398 struct regset_info
*regset
;
5399 int saw_general_regs
= 0;
5403 pid
= lwpid_of (current_thread
);
5404 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5409 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5412 buf
= xmalloc (regset
->size
);
5414 nt_type
= regset
->nt_type
;
5418 iov
.iov_len
= regset
->size
;
5419 data
= (void *) &iov
;
5425 res
= ptrace (regset
->get_request
, pid
,
5426 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5428 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5434 /* If we get EIO on a regset, do not try it again for
5435 this process mode. */
5436 disable_regset (regsets_info
, regset
);
5438 else if (errno
== ENODATA
)
5440 /* ENODATA may be returned if the regset is currently
5441 not "active". This can happen in normal operation,
5442 so suppress the warning in this case. */
5444 else if (errno
== ESRCH
)
5446 /* At this point, ESRCH should mean the process is
5447 already gone, in which case we simply ignore attempts
5448 to read its registers. */
5453 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5460 if (regset
->type
== GENERAL_REGS
)
5461 saw_general_regs
= 1;
5462 regset
->store_function (regcache
, buf
);
5466 if (saw_general_regs
)
5473 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5474 struct regcache
*regcache
)
5476 struct regset_info
*regset
;
5477 int saw_general_regs
= 0;
5481 pid
= lwpid_of (current_thread
);
5482 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5487 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5488 || regset
->fill_function
== NULL
)
5491 buf
= xmalloc (regset
->size
);
5493 /* First fill the buffer with the current register set contents,
5494 in case there are any items in the kernel's regset that are
5495 not in gdbserver's regcache. */
5497 nt_type
= regset
->nt_type
;
5501 iov
.iov_len
= regset
->size
;
5502 data
= (void *) &iov
;
5508 res
= ptrace (regset
->get_request
, pid
,
5509 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5511 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5516 /* Then overlay our cached registers on that. */
5517 regset
->fill_function (regcache
, buf
);
5519 /* Only now do we write the register set. */
5521 res
= ptrace (regset
->set_request
, pid
,
5522 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5524 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5532 /* If we get EIO on a regset, do not try it again for
5533 this process mode. */
5534 disable_regset (regsets_info
, regset
);
5536 else if (errno
== ESRCH
)
5538 /* At this point, ESRCH should mean the process is
5539 already gone, in which case we simply ignore attempts
5540 to change its registers. See also the related
5541 comment in linux_resume_one_lwp. */
5547 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5550 else if (regset
->type
== GENERAL_REGS
)
5551 saw_general_regs
= 1;
5554 if (saw_general_regs
)
5560 #else /* !HAVE_LINUX_REGSETS */
5562 #define use_linux_regsets 0
5563 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5564 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5568 /* Return 1 if register REGNO is supported by one of the regset ptrace
5569 calls or 0 if it has to be transferred individually. */
5572 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5574 unsigned char mask
= 1 << (regno
% 8);
5575 size_t index
= regno
/ 8;
5577 return (use_linux_regsets
5578 && (regs_info
->regset_bitmap
== NULL
5579 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5582 #ifdef HAVE_LINUX_USRREGS
5585 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5589 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5590 error ("Invalid register number %d.", regnum
);
5592 addr
= usrregs
->regmap
[regnum
];
5597 /* Fetch one register. */
5599 fetch_register (const struct usrregs_info
*usrregs
,
5600 struct regcache
*regcache
, int regno
)
5607 if (regno
>= usrregs
->num_regs
)
5609 if ((*the_low_target
.cannot_fetch_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
);
5621 pid
= lwpid_of (current_thread
);
5622 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5625 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5626 ptrace (PTRACE_PEEKUSER
, pid
,
5627 /* Coerce to a uintptr_t first to avoid potential gcc warning
5628 of coercing an 8 byte integer to a 4 byte pointer. */
5629 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5630 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5632 error ("reading register %d: %s", regno
, strerror (errno
));
5635 if (the_low_target
.supply_ptrace_register
)
5636 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5638 supply_register (regcache
, regno
, buf
);
5641 /* Store one register. */
5643 store_register (const struct usrregs_info
*usrregs
,
5644 struct regcache
*regcache
, int regno
)
5651 if (regno
>= usrregs
->num_regs
)
5653 if ((*the_low_target
.cannot_store_register
) (regno
))
5656 regaddr
= register_addr (usrregs
, regno
);
5660 size
= ((register_size (regcache
->tdesc
, regno
)
5661 + sizeof (PTRACE_XFER_TYPE
) - 1)
5662 & -sizeof (PTRACE_XFER_TYPE
));
5663 buf
= (char *) alloca (size
);
5664 memset (buf
, 0, size
);
5666 if (the_low_target
.collect_ptrace_register
)
5667 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5669 collect_register (regcache
, regno
, buf
);
5671 pid
= lwpid_of (current_thread
);
5672 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5675 ptrace (PTRACE_POKEUSER
, pid
,
5676 /* Coerce to a uintptr_t first to avoid potential gcc warning
5677 about coercing an 8 byte integer to a 4 byte pointer. */
5678 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5679 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5682 /* At this point, ESRCH should mean the process is
5683 already gone, in which case we simply ignore attempts
5684 to change its registers. See also the related
5685 comment in linux_resume_one_lwp. */
5689 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5690 error ("writing register %d: %s", regno
, strerror (errno
));
5692 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5696 /* Fetch all registers, or just one, from the child process.
5697 If REGNO is -1, do this for all registers, skipping any that are
5698 assumed to have been retrieved by regsets_fetch_inferior_registers,
5699 unless ALL is non-zero.
5700 Otherwise, REGNO specifies which register (so we can save time). */
5702 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5703 struct regcache
*regcache
, int regno
, int all
)
5705 struct usrregs_info
*usr
= regs_info
->usrregs
;
5709 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5710 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5711 fetch_register (usr
, regcache
, regno
);
5714 fetch_register (usr
, regcache
, regno
);
5717 /* Store our register values back into the inferior.
5718 If REGNO is -1, do this for all registers, skipping any that are
5719 assumed to have been saved by regsets_store_inferior_registers,
5720 unless ALL is non-zero.
5721 Otherwise, REGNO specifies which register (so we can save time). */
5723 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5724 struct regcache
*regcache
, int regno
, int all
)
5726 struct usrregs_info
*usr
= regs_info
->usrregs
;
5730 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5731 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5732 store_register (usr
, regcache
, regno
);
5735 store_register (usr
, regcache
, regno
);
5738 #else /* !HAVE_LINUX_USRREGS */
5740 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5741 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5747 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5751 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5755 if (the_low_target
.fetch_register
!= NULL
5756 && regs_info
->usrregs
!= NULL
)
5757 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5758 (*the_low_target
.fetch_register
) (regcache
, regno
);
5760 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5761 if (regs_info
->usrregs
!= NULL
)
5762 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5766 if (the_low_target
.fetch_register
!= NULL
5767 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5770 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5772 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5774 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5775 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5780 linux_store_registers (struct regcache
*regcache
, int regno
)
5784 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5788 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5790 if (regs_info
->usrregs
!= NULL
)
5791 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5795 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5797 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5799 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5800 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5805 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5806 to debugger memory starting at MYADDR. */
5809 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5811 int pid
= lwpid_of (current_thread
);
5812 PTRACE_XFER_TYPE
*buffer
;
5820 /* Try using /proc. Don't bother for one word. */
5821 if (len
>= 3 * sizeof (long))
5825 /* We could keep this file open and cache it - possibly one per
5826 thread. That requires some juggling, but is even faster. */
5827 sprintf (filename
, "/proc/%d/mem", pid
);
5828 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5832 /* If pread64 is available, use it. It's faster if the kernel
5833 supports it (only one syscall), and it's 64-bit safe even on
5834 32-bit platforms (for instance, SPARC debugging a SPARC64
5837 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5840 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5841 bytes
= read (fd
, myaddr
, len
);
5848 /* Some data was read, we'll try to get the rest with ptrace. */
5858 /* Round starting address down to longword boundary. */
5859 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5860 /* Round ending address up; get number of longwords that makes. */
5861 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5862 / sizeof (PTRACE_XFER_TYPE
));
5863 /* Allocate buffer of that many longwords. */
5864 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5866 /* Read all the longwords */
5868 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5870 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5871 about coercing an 8 byte integer to a 4 byte pointer. */
5872 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5873 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5874 (PTRACE_TYPE_ARG4
) 0);
5880 /* Copy appropriate bytes out of the buffer. */
5883 i
*= sizeof (PTRACE_XFER_TYPE
);
5884 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5886 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5893 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5894 memory at MEMADDR. On failure (cannot write to the inferior)
5895 returns the value of errno. Always succeeds if LEN is zero. */
5898 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5901 /* Round starting address down to longword boundary. */
5902 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5903 /* Round ending address up; get number of longwords that makes. */
5905 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5906 / sizeof (PTRACE_XFER_TYPE
);
5908 /* Allocate buffer of that many longwords. */
5909 PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5911 int pid
= lwpid_of (current_thread
);
5915 /* Zero length write always succeeds. */
5921 /* Dump up to four bytes. */
5922 char str
[4 * 2 + 1];
5924 int dump
= len
< 4 ? len
: 4;
5926 for (i
= 0; i
< dump
; i
++)
5928 sprintf (p
, "%02x", myaddr
[i
]);
5933 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5934 str
, (long) memaddr
, pid
);
5937 /* Fill start and end extra bytes of buffer with existing memory data. */
5940 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5941 about coercing an 8 byte integer to a 4 byte pointer. */
5942 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5943 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5944 (PTRACE_TYPE_ARG4
) 0);
5952 = ptrace (PTRACE_PEEKTEXT
, pid
,
5953 /* Coerce to a uintptr_t first to avoid potential gcc warning
5954 about coercing an 8 byte integer to a 4 byte pointer. */
5955 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5956 * sizeof (PTRACE_XFER_TYPE
)),
5957 (PTRACE_TYPE_ARG4
) 0);
5962 /* Copy data to be written over corresponding part of buffer. */
5964 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5967 /* Write the entire buffer. */
5969 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5972 ptrace (PTRACE_POKETEXT
, pid
,
5973 /* Coerce to a uintptr_t first to avoid potential gcc warning
5974 about coercing an 8 byte integer to a 4 byte pointer. */
5975 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5976 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5985 linux_look_up_symbols (void)
5987 #ifdef USE_THREAD_DB
5988 struct process_info
*proc
= current_process ();
5990 if (proc
->priv
->thread_db
!= NULL
)
5998 linux_request_interrupt (void)
6000 /* Send a SIGINT to the process group. This acts just like the user
6001 typed a ^C on the controlling terminal. */
6002 kill (-signal_pid
, SIGINT
);
6005 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
6006 to debugger memory starting at MYADDR. */
6009 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
6011 char filename
[PATH_MAX
];
6013 int pid
= lwpid_of (current_thread
);
6015 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6017 fd
= open (filename
, O_RDONLY
);
6021 if (offset
!= (CORE_ADDR
) 0
6022 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6025 n
= read (fd
, myaddr
, len
);
6032 /* These breakpoint and watchpoint related wrapper functions simply
6033 pass on the function call if the target has registered a
6034 corresponding function. */
6037 linux_supports_z_point_type (char z_type
)
6039 return (the_low_target
.supports_z_point_type
!= NULL
6040 && the_low_target
.supports_z_point_type (z_type
));
6044 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6045 int size
, struct raw_breakpoint
*bp
)
6047 if (type
== raw_bkpt_type_sw
)
6048 return insert_memory_breakpoint (bp
);
6049 else if (the_low_target
.insert_point
!= NULL
)
6050 return the_low_target
.insert_point (type
, addr
, size
, bp
);
6052 /* Unsupported (see target.h). */
6057 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6058 int size
, struct raw_breakpoint
*bp
)
6060 if (type
== raw_bkpt_type_sw
)
6061 return remove_memory_breakpoint (bp
);
6062 else if (the_low_target
.remove_point
!= NULL
)
6063 return the_low_target
.remove_point (type
, addr
, size
, bp
);
6065 /* Unsupported (see target.h). */
6069 /* Implement the to_stopped_by_sw_breakpoint target_ops
6073 linux_stopped_by_sw_breakpoint (void)
6075 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6077 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
6080 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
6084 linux_supports_stopped_by_sw_breakpoint (void)
6086 return USE_SIGTRAP_SIGINFO
;
6089 /* Implement the to_stopped_by_hw_breakpoint target_ops
6093 linux_stopped_by_hw_breakpoint (void)
6095 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6097 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6100 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6104 linux_supports_stopped_by_hw_breakpoint (void)
6106 return USE_SIGTRAP_SIGINFO
;
6109 /* Implement the supports_hardware_single_step target_ops method. */
6112 linux_supports_hardware_single_step (void)
6114 return can_hardware_single_step ();
6118 linux_supports_software_single_step (void)
6120 return can_software_single_step ();
6124 linux_stopped_by_watchpoint (void)
6126 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6128 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6132 linux_stopped_data_address (void)
6134 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6136 return lwp
->stopped_data_address
;
6139 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6140 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6141 && defined(PT_TEXT_END_ADDR)
6143 /* This is only used for targets that define PT_TEXT_ADDR,
6144 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6145 the target has different ways of acquiring this information, like
6148 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6149 to tell gdb about. */
6152 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6154 unsigned long text
, text_end
, data
;
6155 int pid
= lwpid_of (current_thread
);
6159 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6160 (PTRACE_TYPE_ARG4
) 0);
6161 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6162 (PTRACE_TYPE_ARG4
) 0);
6163 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6164 (PTRACE_TYPE_ARG4
) 0);
6168 /* Both text and data offsets produced at compile-time (and so
6169 used by gdb) are relative to the beginning of the program,
6170 with the data segment immediately following the text segment.
6171 However, the actual runtime layout in memory may put the data
6172 somewhere else, so when we send gdb a data base-address, we
6173 use the real data base address and subtract the compile-time
6174 data base-address from it (which is just the length of the
6175 text segment). BSS immediately follows data in both
6178 *data_p
= data
- (text_end
- text
);
6187 linux_qxfer_osdata (const char *annex
,
6188 unsigned char *readbuf
, unsigned const char *writebuf
,
6189 CORE_ADDR offset
, int len
)
6191 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6194 /* Convert a native/host siginfo object, into/from the siginfo in the
6195 layout of the inferiors' architecture. */
6198 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6202 if (the_low_target
.siginfo_fixup
!= NULL
)
6203 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6205 /* If there was no callback, or the callback didn't do anything,
6206 then just do a straight memcpy. */
6210 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6212 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6217 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6218 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6222 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6224 if (current_thread
== NULL
)
6227 pid
= lwpid_of (current_thread
);
6230 debug_printf ("%s siginfo for lwp %d.\n",
6231 readbuf
!= NULL
? "Reading" : "Writing",
6234 if (offset
>= sizeof (siginfo
))
6237 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6240 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6241 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6242 inferior with a 64-bit GDBSERVER should look the same as debugging it
6243 with a 32-bit GDBSERVER, we need to convert it. */
6244 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6246 if (offset
+ len
> sizeof (siginfo
))
6247 len
= sizeof (siginfo
) - offset
;
6249 if (readbuf
!= NULL
)
6250 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6253 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6255 /* Convert back to ptrace layout before flushing it out. */
6256 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6258 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6265 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6266 so we notice when children change state; as the handler for the
6267 sigsuspend in my_waitpid. */
6270 sigchld_handler (int signo
)
6272 int old_errno
= errno
;
6278 /* fprintf is not async-signal-safe, so call write
6280 if (write (2, "sigchld_handler\n",
6281 sizeof ("sigchld_handler\n") - 1) < 0)
6282 break; /* just ignore */
6286 if (target_is_async_p ())
6287 async_file_mark (); /* trigger a linux_wait */
6293 linux_supports_non_stop (void)
6299 linux_async (int enable
)
6301 int previous
= target_is_async_p ();
6304 debug_printf ("linux_async (%d), previous=%d\n",
6307 if (previous
!= enable
)
6310 sigemptyset (&mask
);
6311 sigaddset (&mask
, SIGCHLD
);
6313 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6317 if (pipe (linux_event_pipe
) == -1)
6319 linux_event_pipe
[0] = -1;
6320 linux_event_pipe
[1] = -1;
6321 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6323 warning ("creating event pipe failed.");
6327 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6328 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6330 /* Register the event loop handler. */
6331 add_file_handler (linux_event_pipe
[0],
6332 handle_target_event
, NULL
);
6334 /* Always trigger a linux_wait. */
6339 delete_file_handler (linux_event_pipe
[0]);
6341 close (linux_event_pipe
[0]);
6342 close (linux_event_pipe
[1]);
6343 linux_event_pipe
[0] = -1;
6344 linux_event_pipe
[1] = -1;
6347 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6354 linux_start_non_stop (int nonstop
)
6356 /* Register or unregister from event-loop accordingly. */
6357 linux_async (nonstop
);
6359 if (target_is_async_p () != (nonstop
!= 0))
6366 linux_supports_multi_process (void)
6371 /* Check if fork events are supported. */
6374 linux_supports_fork_events (void)
6376 return linux_supports_tracefork ();
6379 /* Check if vfork events are supported. */
6382 linux_supports_vfork_events (void)
6384 return linux_supports_tracefork ();
6387 /* Check if exec events are supported. */
6390 linux_supports_exec_events (void)
6392 return linux_supports_traceexec ();
6395 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6396 ptrace flags for all inferiors. This is in case the new GDB connection
6397 doesn't support the same set of events that the previous one did. */
6400 linux_handle_new_gdb_connection (void)
6402 /* Request that all the lwps reset their ptrace options. */
6403 for_each_thread ([] (thread_info
*thread
)
6405 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6409 /* Stop the lwp so we can modify its ptrace options. */
6410 lwp
->must_set_ptrace_flags
= 1;
6411 linux_stop_lwp (lwp
);
6415 /* Already stopped; go ahead and set the ptrace options. */
6416 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6417 int options
= linux_low_ptrace_options (proc
->attached
);
6419 linux_enable_event_reporting (lwpid_of (thread
), options
);
6420 lwp
->must_set_ptrace_flags
= 0;
6426 linux_supports_disable_randomization (void)
6428 #ifdef HAVE_PERSONALITY
6436 linux_supports_agent (void)
6442 linux_supports_range_stepping (void)
6444 if (can_software_single_step ())
6446 if (*the_low_target
.supports_range_stepping
== NULL
)
6449 return (*the_low_target
.supports_range_stepping
) ();
6452 /* Enumerate spufs IDs for process PID. */
6454 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6460 struct dirent
*entry
;
6462 sprintf (path
, "/proc/%ld/fd", pid
);
6463 dir
= opendir (path
);
6468 while ((entry
= readdir (dir
)) != NULL
)
6474 fd
= atoi (entry
->d_name
);
6478 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6479 if (stat (path
, &st
) != 0)
6481 if (!S_ISDIR (st
.st_mode
))
6484 if (statfs (path
, &stfs
) != 0)
6486 if (stfs
.f_type
!= SPUFS_MAGIC
)
6489 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6491 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6501 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6502 object type, using the /proc file system. */
6504 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6505 unsigned const char *writebuf
,
6506 CORE_ADDR offset
, int len
)
6508 long pid
= lwpid_of (current_thread
);
6513 if (!writebuf
&& !readbuf
)
6521 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6524 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6525 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6530 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6537 ret
= write (fd
, writebuf
, (size_t) len
);
6539 ret
= read (fd
, readbuf
, (size_t) len
);
6545 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6546 struct target_loadseg
6548 /* Core address to which the segment is mapped. */
6550 /* VMA recorded in the program header. */
6552 /* Size of this segment in memory. */
6556 # if defined PT_GETDSBT
6557 struct target_loadmap
6559 /* Protocol version number, must be zero. */
6561 /* Pointer to the DSBT table, its size, and the DSBT index. */
6562 unsigned *dsbt_table
;
6563 unsigned dsbt_size
, dsbt_index
;
6564 /* Number of segments in this map. */
6566 /* The actual memory map. */
6567 struct target_loadseg segs
[/*nsegs*/];
6569 # define LINUX_LOADMAP PT_GETDSBT
6570 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6571 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6573 struct target_loadmap
6575 /* Protocol version number, must be zero. */
6577 /* Number of segments in this map. */
6579 /* The actual memory map. */
6580 struct target_loadseg segs
[/*nsegs*/];
6582 # define LINUX_LOADMAP PTRACE_GETFDPIC
6583 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6584 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6588 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6589 unsigned char *myaddr
, unsigned int len
)
6591 int pid
= lwpid_of (current_thread
);
6593 struct target_loadmap
*data
= NULL
;
6594 unsigned int actual_length
, copy_length
;
6596 if (strcmp (annex
, "exec") == 0)
6597 addr
= (int) LINUX_LOADMAP_EXEC
;
6598 else if (strcmp (annex
, "interp") == 0)
6599 addr
= (int) LINUX_LOADMAP_INTERP
;
6603 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6609 actual_length
= sizeof (struct target_loadmap
)
6610 + sizeof (struct target_loadseg
) * data
->nsegs
;
6612 if (offset
< 0 || offset
> actual_length
)
6615 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6616 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6620 # define linux_read_loadmap NULL
6621 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6624 linux_process_qsupported (char **features
, int count
)
6626 if (the_low_target
.process_qsupported
!= NULL
)
6627 the_low_target
.process_qsupported (features
, count
);
6631 linux_supports_catch_syscall (void)
6633 return (the_low_target
.get_syscall_trapinfo
!= NULL
6634 && linux_supports_tracesysgood ());
6638 linux_get_ipa_tdesc_idx (void)
6640 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6643 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6647 linux_supports_tracepoints (void)
6649 if (*the_low_target
.supports_tracepoints
== NULL
)
6652 return (*the_low_target
.supports_tracepoints
) ();
6656 linux_read_pc (struct regcache
*regcache
)
6658 if (the_low_target
.get_pc
== NULL
)
6661 return (*the_low_target
.get_pc
) (regcache
);
6665 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6667 gdb_assert (the_low_target
.set_pc
!= NULL
);
6669 (*the_low_target
.set_pc
) (regcache
, pc
);
6673 linux_thread_stopped (struct thread_info
*thread
)
6675 return get_thread_lwp (thread
)->stopped
;
6678 /* This exposes stop-all-threads functionality to other modules. */
6681 linux_pause_all (int freeze
)
6683 stop_all_lwps (freeze
, NULL
);
6686 /* This exposes unstop-all-threads functionality to other gdbserver
6690 linux_unpause_all (int unfreeze
)
6692 unstop_all_lwps (unfreeze
, NULL
);
6696 linux_prepare_to_access_memory (void)
6698 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6701 linux_pause_all (1);
6706 linux_done_accessing_memory (void)
6708 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6711 linux_unpause_all (1);
6715 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6716 CORE_ADDR collector
,
6719 CORE_ADDR
*jump_entry
,
6720 CORE_ADDR
*trampoline
,
6721 ULONGEST
*trampoline_size
,
6722 unsigned char *jjump_pad_insn
,
6723 ULONGEST
*jjump_pad_insn_size
,
6724 CORE_ADDR
*adjusted_insn_addr
,
6725 CORE_ADDR
*adjusted_insn_addr_end
,
6728 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6729 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6730 jump_entry
, trampoline
, trampoline_size
,
6731 jjump_pad_insn
, jjump_pad_insn_size
,
6732 adjusted_insn_addr
, adjusted_insn_addr_end
,
6736 static struct emit_ops
*
6737 linux_emit_ops (void)
6739 if (the_low_target
.emit_ops
!= NULL
)
6740 return (*the_low_target
.emit_ops
) ();
6746 linux_get_min_fast_tracepoint_insn_len (void)
6748 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6751 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6754 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6755 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6757 char filename
[PATH_MAX
];
6759 const int auxv_size
= is_elf64
6760 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6761 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6763 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6765 fd
= open (filename
, O_RDONLY
);
6771 while (read (fd
, buf
, auxv_size
) == auxv_size
6772 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6776 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6778 switch (aux
->a_type
)
6781 *phdr_memaddr
= aux
->a_un
.a_val
;
6784 *num_phdr
= aux
->a_un
.a_val
;
6790 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6792 switch (aux
->a_type
)
6795 *phdr_memaddr
= aux
->a_un
.a_val
;
6798 *num_phdr
= aux
->a_un
.a_val
;
6806 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6808 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6809 "phdr_memaddr = %ld, phdr_num = %d",
6810 (long) *phdr_memaddr
, *num_phdr
);
6817 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6820 get_dynamic (const int pid
, const int is_elf64
)
6822 CORE_ADDR phdr_memaddr
, relocation
;
6824 unsigned char *phdr_buf
;
6825 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6827 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6830 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6831 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6833 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6836 /* Compute relocation: it is expected to be 0 for "regular" executables,
6837 non-zero for PIE ones. */
6839 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6842 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6844 if (p
->p_type
== PT_PHDR
)
6845 relocation
= phdr_memaddr
- p
->p_vaddr
;
6849 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6851 if (p
->p_type
== PT_PHDR
)
6852 relocation
= phdr_memaddr
- p
->p_vaddr
;
6855 if (relocation
== -1)
6857 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6858 any real world executables, including PIE executables, have always
6859 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6860 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6861 or present DT_DEBUG anyway (fpc binaries are statically linked).
6863 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6865 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6870 for (i
= 0; i
< num_phdr
; i
++)
6874 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6876 if (p
->p_type
== PT_DYNAMIC
)
6877 return p
->p_vaddr
+ relocation
;
6881 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6883 if (p
->p_type
== PT_DYNAMIC
)
6884 return p
->p_vaddr
+ relocation
;
6891 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6892 can be 0 if the inferior does not yet have the library list initialized.
6893 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6894 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6897 get_r_debug (const int pid
, const int is_elf64
)
6899 CORE_ADDR dynamic_memaddr
;
6900 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6901 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6904 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6905 if (dynamic_memaddr
== 0)
6908 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6912 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6913 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6917 unsigned char buf
[sizeof (Elf64_Xword
)];
6921 #ifdef DT_MIPS_RLD_MAP
6922 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6924 if (linux_read_memory (dyn
->d_un
.d_val
,
6925 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6930 #endif /* DT_MIPS_RLD_MAP */
6931 #ifdef DT_MIPS_RLD_MAP_REL
6932 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6934 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6935 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6940 #endif /* DT_MIPS_RLD_MAP_REL */
6942 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6943 map
= dyn
->d_un
.d_val
;
6945 if (dyn
->d_tag
== DT_NULL
)
6950 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6951 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6955 unsigned char buf
[sizeof (Elf32_Word
)];
6959 #ifdef DT_MIPS_RLD_MAP
6960 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6962 if (linux_read_memory (dyn
->d_un
.d_val
,
6963 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6968 #endif /* DT_MIPS_RLD_MAP */
6969 #ifdef DT_MIPS_RLD_MAP_REL
6970 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6972 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6973 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6978 #endif /* DT_MIPS_RLD_MAP_REL */
6980 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6981 map
= dyn
->d_un
.d_val
;
6983 if (dyn
->d_tag
== DT_NULL
)
6987 dynamic_memaddr
+= dyn_size
;
6993 /* Read one pointer from MEMADDR in the inferior. */
6996 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
7000 /* Go through a union so this works on either big or little endian
7001 hosts, when the inferior's pointer size is smaller than the size
7002 of CORE_ADDR. It is assumed the inferior's endianness is the
7003 same of the superior's. */
7006 CORE_ADDR core_addr
;
7011 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
7014 if (ptr_size
== sizeof (CORE_ADDR
))
7015 *ptr
= addr
.core_addr
;
7016 else if (ptr_size
== sizeof (unsigned int))
7019 gdb_assert_not_reached ("unhandled pointer size");
7024 struct link_map_offsets
7026 /* Offset and size of r_debug.r_version. */
7027 int r_version_offset
;
7029 /* Offset and size of r_debug.r_map. */
7032 /* Offset to l_addr field in struct link_map. */
7035 /* Offset to l_name field in struct link_map. */
7038 /* Offset to l_ld field in struct link_map. */
7041 /* Offset to l_next field in struct link_map. */
7044 /* Offset to l_prev field in struct link_map. */
7048 /* Construct qXfer:libraries-svr4:read reply. */
7051 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
7052 unsigned const char *writebuf
,
7053 CORE_ADDR offset
, int len
)
7056 unsigned document_len
;
7057 struct process_info_private
*const priv
= current_process ()->priv
;
7058 char filename
[PATH_MAX
];
7061 static const struct link_map_offsets lmo_32bit_offsets
=
7063 0, /* r_version offset. */
7064 4, /* r_debug.r_map offset. */
7065 0, /* l_addr offset in link_map. */
7066 4, /* l_name offset in link_map. */
7067 8, /* l_ld offset in link_map. */
7068 12, /* l_next offset in link_map. */
7069 16 /* l_prev offset in link_map. */
7072 static const struct link_map_offsets lmo_64bit_offsets
=
7074 0, /* r_version offset. */
7075 8, /* r_debug.r_map offset. */
7076 0, /* l_addr offset in link_map. */
7077 8, /* l_name offset in link_map. */
7078 16, /* l_ld offset in link_map. */
7079 24, /* l_next offset in link_map. */
7080 32 /* l_prev offset in link_map. */
7082 const struct link_map_offsets
*lmo
;
7083 unsigned int machine
;
7085 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7086 int allocated
= 1024;
7088 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7089 int header_done
= 0;
7091 if (writebuf
!= NULL
)
7093 if (readbuf
== NULL
)
7096 pid
= lwpid_of (current_thread
);
7097 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7098 is_elf64
= elf_64_file_p (filename
, &machine
);
7099 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7100 ptr_size
= is_elf64
? 8 : 4;
7102 while (annex
[0] != '\0')
7108 sep
= strchr (annex
, '=');
7113 if (len
== 5 && startswith (annex
, "start"))
7115 else if (len
== 4 && startswith (annex
, "prev"))
7119 annex
= strchr (sep
, ';');
7126 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7133 if (priv
->r_debug
== 0)
7134 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7136 /* We failed to find DT_DEBUG. Such situation will not change
7137 for this inferior - do not retry it. Report it to GDB as
7138 E01, see for the reasons at the GDB solib-svr4.c side. */
7139 if (priv
->r_debug
== (CORE_ADDR
) -1)
7142 if (priv
->r_debug
!= 0)
7144 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7145 (unsigned char *) &r_version
,
7146 sizeof (r_version
)) != 0
7149 warning ("unexpected r_debug version %d", r_version
);
7151 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7152 &lm_addr
, ptr_size
) != 0)
7154 warning ("unable to read r_map from 0x%lx",
7155 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7160 document
= (char *) xmalloc (allocated
);
7161 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7162 p
= document
+ strlen (document
);
7165 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7166 &l_name
, ptr_size
) == 0
7167 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7168 &l_addr
, ptr_size
) == 0
7169 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7170 &l_ld
, ptr_size
) == 0
7171 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7172 &l_prev
, ptr_size
) == 0
7173 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7174 &l_next
, ptr_size
) == 0)
7176 unsigned char libname
[PATH_MAX
];
7178 if (lm_prev
!= l_prev
)
7180 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7181 (long) lm_prev
, (long) l_prev
);
7185 /* Ignore the first entry even if it has valid name as the first entry
7186 corresponds to the main executable. The first entry should not be
7187 skipped if the dynamic loader was loaded late by a static executable
7188 (see solib-svr4.c parameter ignore_first). But in such case the main
7189 executable does not have PT_DYNAMIC present and this function already
7190 exited above due to failed get_r_debug. */
7193 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7198 /* Not checking for error because reading may stop before
7199 we've got PATH_MAX worth of characters. */
7201 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7202 libname
[sizeof (libname
) - 1] = '\0';
7203 if (libname
[0] != '\0')
7205 /* 6x the size for xml_escape_text below. */
7206 size_t len
= 6 * strlen ((char *) libname
);
7210 /* Terminate `<library-list-svr4'. */
7215 while (allocated
< p
- document
+ len
+ 200)
7217 /* Expand to guarantee sufficient storage. */
7218 uintptr_t document_len
= p
- document
;
7220 document
= (char *) xrealloc (document
, 2 * allocated
);
7222 p
= document
+ document_len
;
7225 std::string name
= xml_escape_text ((char *) libname
);
7226 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7227 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7228 name
.c_str (), (unsigned long) lm_addr
,
7229 (unsigned long) l_addr
, (unsigned long) l_ld
);
7239 /* Empty list; terminate `<library-list-svr4'. */
7243 strcpy (p
, "</library-list-svr4>");
7245 document_len
= strlen (document
);
7246 if (offset
< document_len
)
7247 document_len
-= offset
;
7250 if (len
> document_len
)
7253 memcpy (readbuf
, document
+ offset
, len
);
7259 #ifdef HAVE_LINUX_BTRACE
7261 /* See to_disable_btrace target method. */
7264 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7266 enum btrace_error err
;
7268 err
= linux_disable_btrace (tinfo
);
7269 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7272 /* Encode an Intel Processor Trace configuration. */
7275 linux_low_encode_pt_config (struct buffer
*buffer
,
7276 const struct btrace_data_pt_config
*config
)
7278 buffer_grow_str (buffer
, "<pt-config>\n");
7280 switch (config
->cpu
.vendor
)
7283 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7284 "model=\"%u\" stepping=\"%u\"/>\n",
7285 config
->cpu
.family
, config
->cpu
.model
,
7286 config
->cpu
.stepping
);
7293 buffer_grow_str (buffer
, "</pt-config>\n");
7296 /* Encode a raw buffer. */
7299 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7305 /* We use hex encoding - see common/rsp-low.h. */
7306 buffer_grow_str (buffer
, "<raw>\n");
7312 elem
[0] = tohex ((*data
>> 4) & 0xf);
7313 elem
[1] = tohex (*data
++ & 0xf);
7315 buffer_grow (buffer
, elem
, 2);
7318 buffer_grow_str (buffer
, "</raw>\n");
7321 /* See to_read_btrace target method. */
7324 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7325 enum btrace_read_type type
)
7327 struct btrace_data btrace
;
7328 struct btrace_block
*block
;
7329 enum btrace_error err
;
7332 btrace_data_init (&btrace
);
7334 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7335 if (err
!= BTRACE_ERR_NONE
)
7337 if (err
== BTRACE_ERR_OVERFLOW
)
7338 buffer_grow_str0 (buffer
, "E.Overflow.");
7340 buffer_grow_str0 (buffer
, "E.Generic Error.");
7345 switch (btrace
.format
)
7347 case BTRACE_FORMAT_NONE
:
7348 buffer_grow_str0 (buffer
, "E.No Trace.");
7351 case BTRACE_FORMAT_BTS
:
7352 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7353 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7356 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7358 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7359 paddress (block
->begin
), paddress (block
->end
));
7361 buffer_grow_str0 (buffer
, "</btrace>\n");
7364 case BTRACE_FORMAT_PT
:
7365 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7366 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7367 buffer_grow_str (buffer
, "<pt>\n");
7369 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7371 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7372 btrace
.variant
.pt
.size
);
7374 buffer_grow_str (buffer
, "</pt>\n");
7375 buffer_grow_str0 (buffer
, "</btrace>\n");
7379 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7383 btrace_data_fini (&btrace
);
7387 btrace_data_fini (&btrace
);
7391 /* See to_btrace_conf target method. */
7394 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7395 struct buffer
*buffer
)
7397 const struct btrace_config
*conf
;
7399 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7400 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7402 conf
= linux_btrace_conf (tinfo
);
7405 switch (conf
->format
)
7407 case BTRACE_FORMAT_NONE
:
7410 case BTRACE_FORMAT_BTS
:
7411 buffer_xml_printf (buffer
, "<bts");
7412 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7413 buffer_xml_printf (buffer
, " />\n");
7416 case BTRACE_FORMAT_PT
:
7417 buffer_xml_printf (buffer
, "<pt");
7418 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7419 buffer_xml_printf (buffer
, "/>\n");
7424 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7427 #endif /* HAVE_LINUX_BTRACE */
7429 /* See nat/linux-nat.h. */
7432 current_lwp_ptid (void)
7434 return ptid_of (current_thread
);
7437 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7440 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7442 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7443 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7445 return default_breakpoint_kind_from_pc (pcptr
);
7448 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7450 static const gdb_byte
*
7451 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7453 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7455 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7458 /* Implementation of the target_ops method
7459 "breakpoint_kind_from_current_state". */
7462 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7464 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7465 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7467 return linux_breakpoint_kind_from_pc (pcptr
);
7470 /* Default implementation of linux_target_ops method "set_pc" for
7471 32-bit pc register which is literally named "pc". */
7474 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7476 uint32_t newpc
= pc
;
7478 supply_register_by_name (regcache
, "pc", &newpc
);
7481 /* Default implementation of linux_target_ops method "get_pc" for
7482 32-bit pc register which is literally named "pc". */
7485 linux_get_pc_32bit (struct regcache
*regcache
)
7489 collect_register_by_name (regcache
, "pc", &pc
);
7491 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7495 /* Default implementation of linux_target_ops method "set_pc" for
7496 64-bit pc register which is literally named "pc". */
7499 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7501 uint64_t newpc
= pc
;
7503 supply_register_by_name (regcache
, "pc", &newpc
);
7506 /* Default implementation of linux_target_ops method "get_pc" for
7507 64-bit pc register which is literally named "pc". */
7510 linux_get_pc_64bit (struct regcache
*regcache
)
7514 collect_register_by_name (regcache
, "pc", &pc
);
7516 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7521 static struct target_ops linux_target_ops
= {
7522 linux_create_inferior
,
7523 linux_post_create_inferior
,
7532 linux_fetch_registers
,
7533 linux_store_registers
,
7534 linux_prepare_to_access_memory
,
7535 linux_done_accessing_memory
,
7538 linux_look_up_symbols
,
7539 linux_request_interrupt
,
7541 linux_supports_z_point_type
,
7544 linux_stopped_by_sw_breakpoint
,
7545 linux_supports_stopped_by_sw_breakpoint
,
7546 linux_stopped_by_hw_breakpoint
,
7547 linux_supports_stopped_by_hw_breakpoint
,
7548 linux_supports_hardware_single_step
,
7549 linux_stopped_by_watchpoint
,
7550 linux_stopped_data_address
,
7551 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7552 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7553 && defined(PT_TEXT_END_ADDR)
7558 #ifdef USE_THREAD_DB
7559 thread_db_get_tls_address
,
7564 hostio_last_error_from_errno
,
7567 linux_supports_non_stop
,
7569 linux_start_non_stop
,
7570 linux_supports_multi_process
,
7571 linux_supports_fork_events
,
7572 linux_supports_vfork_events
,
7573 linux_supports_exec_events
,
7574 linux_handle_new_gdb_connection
,
7575 #ifdef USE_THREAD_DB
7576 thread_db_handle_monitor_command
,
7580 linux_common_core_of_thread
,
7582 linux_process_qsupported
,
7583 linux_supports_tracepoints
,
7586 linux_thread_stopped
,
7590 linux_stabilize_threads
,
7591 linux_install_fast_tracepoint_jump_pad
,
7593 linux_supports_disable_randomization
,
7594 linux_get_min_fast_tracepoint_insn_len
,
7595 linux_qxfer_libraries_svr4
,
7596 linux_supports_agent
,
7597 #ifdef HAVE_LINUX_BTRACE
7598 linux_supports_btrace
,
7599 linux_enable_btrace
,
7600 linux_low_disable_btrace
,
7601 linux_low_read_btrace
,
7602 linux_low_btrace_conf
,
7610 linux_supports_range_stepping
,
7611 linux_proc_pid_to_exec_file
,
7612 linux_mntns_open_cloexec
,
7614 linux_mntns_readlink
,
7615 linux_breakpoint_kind_from_pc
,
7616 linux_sw_breakpoint_from_kind
,
7617 linux_proc_tid_get_name
,
7618 linux_breakpoint_kind_from_current_state
,
7619 linux_supports_software_single_step
,
7620 linux_supports_catch_syscall
,
7621 linux_get_ipa_tdesc_idx
,
7623 thread_db_thread_handle
,
7629 #ifdef HAVE_LINUX_REGSETS
7631 initialize_regsets_info (struct regsets_info
*info
)
7633 for (info
->num_regsets
= 0;
7634 info
->regsets
[info
->num_regsets
].size
>= 0;
7635 info
->num_regsets
++)
7641 initialize_low (void)
7643 struct sigaction sigchld_action
;
7645 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7646 set_target_ops (&linux_target_ops
);
7648 linux_ptrace_init_warnings ();
7650 sigchld_action
.sa_handler
= sigchld_handler
;
7651 sigemptyset (&sigchld_action
.sa_mask
);
7652 sigchld_action
.sa_flags
= SA_RESTART
;
7653 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7655 initialize_low_arch ();
7657 linux_check_ptrace_features ();