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 /* The arguments passed to iterate_over_lwps. */
1881 struct iterate_over_lwps_args
1883 /* The FILTER argument passed to iterate_over_lwps. */
1886 /* The CALLBACK argument passed to iterate_over_lwps. */
1887 iterate_over_lwps_ftype
*callback
;
1889 /* The DATA argument passed to iterate_over_lwps. */
1893 /* Callback for find_inferior used by iterate_over_lwps to filter
1894 calls to the callback supplied to that function. Returning a
1895 nonzero value causes find_inferiors to stop iterating and return
1896 the current inferior_list_entry. Returning zero indicates that
1897 find_inferiors should continue iterating. */
1900 iterate_over_lwps_filter (thread_info
*thread
, void *args_p
)
1902 struct iterate_over_lwps_args
*args
1903 = (struct iterate_over_lwps_args
*) args_p
;
1905 if (thread
->id
.matches (args
->filter
))
1907 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1909 return (*args
->callback
) (lwp
, args
->data
);
1915 /* See nat/linux-nat.h. */
1918 iterate_over_lwps (ptid_t filter
,
1919 iterate_over_lwps_ftype callback
,
1922 struct iterate_over_lwps_args args
= {filter
, callback
, data
};
1924 thread_info
*thread
= find_inferior (&all_threads
, iterate_over_lwps_filter
,
1929 return get_thread_lwp (thread
);
1932 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1933 their exits until all other threads in the group have exited. */
1936 check_zombie_leaders (void)
1938 for_each_process ([] (process_info
*proc
) {
1939 pid_t leader_pid
= pid_of (proc
);
1940 struct lwp_info
*leader_lp
;
1942 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1945 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1946 "num_lwps=%d, zombie=%d\n",
1947 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1948 linux_proc_pid_is_zombie (leader_pid
));
1950 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1951 /* Check if there are other threads in the group, as we may
1952 have raced with the inferior simply exiting. */
1953 && !last_thread_of_process_p (leader_pid
)
1954 && linux_proc_pid_is_zombie (leader_pid
))
1956 /* A leader zombie can mean one of two things:
1958 - It exited, and there's an exit status pending
1959 available, or only the leader exited (not the whole
1960 program). In the latter case, we can't waitpid the
1961 leader's exit status until all other threads are gone.
1963 - There are 3 or more threads in the group, and a thread
1964 other than the leader exec'd. On an exec, the Linux
1965 kernel destroys all other threads (except the execing
1966 one) in the thread group, and resets the execing thread's
1967 tid to the tgid. No exit notification is sent for the
1968 execing thread -- from the ptracer's perspective, it
1969 appears as though the execing thread just vanishes.
1970 Until we reap all other threads except the leader and the
1971 execing thread, the leader will be zombie, and the
1972 execing thread will be in `D (disc sleep)'. As soon as
1973 all other threads are reaped, the execing thread changes
1974 it's tid to the tgid, and the previous (zombie) leader
1975 vanishes, giving place to the "new" leader. We could try
1976 distinguishing the exit and exec cases, by waiting once
1977 more, and seeing if something comes out, but it doesn't
1978 sound useful. The previous leader _does_ go away, and
1979 we'll re-add the new one once we see the exec event
1980 (which is just the same as what would happen if the
1981 previous leader did exit voluntarily before some other
1985 debug_printf ("CZL: Thread group leader %d zombie "
1986 "(it exited, or another thread execd).\n",
1989 delete_lwp (leader_lp
);
1994 /* Callback for `find_inferior'. Returns the first LWP that is not
1995 stopped. ARG is a PTID filter. */
1998 not_stopped_callback (thread_info
*thread
, void *arg
)
2000 struct lwp_info
*lwp
;
2001 ptid_t filter
= *(ptid_t
*) arg
;
2003 if (!ptid_match (ptid_of (thread
), filter
))
2006 lwp
= get_thread_lwp (thread
);
2013 /* Increment LWP's suspend count. */
2016 lwp_suspended_inc (struct lwp_info
*lwp
)
2020 if (debug_threads
&& lwp
->suspended
> 4)
2022 struct thread_info
*thread
= get_lwp_thread (lwp
);
2024 debug_printf ("LWP %ld has a suspiciously high suspend count,"
2025 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
2029 /* Decrement LWP's suspend count. */
2032 lwp_suspended_decr (struct lwp_info
*lwp
)
2036 if (lwp
->suspended
< 0)
2038 struct thread_info
*thread
= get_lwp_thread (lwp
);
2040 internal_error (__FILE__
, __LINE__
,
2041 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
2046 /* This function should only be called if the LWP got a SIGTRAP.
2048 Handle any tracepoint steps or hits. Return true if a tracepoint
2049 event was handled, 0 otherwise. */
2052 handle_tracepoints (struct lwp_info
*lwp
)
2054 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
2055 int tpoint_related_event
= 0;
2057 gdb_assert (lwp
->suspended
== 0);
2059 /* If this tracepoint hit causes a tracing stop, we'll immediately
2060 uninsert tracepoints. To do this, we temporarily pause all
2061 threads, unpatch away, and then unpause threads. We need to make
2062 sure the unpausing doesn't resume LWP too. */
2063 lwp_suspended_inc (lwp
);
2065 /* And we need to be sure that any all-threads-stopping doesn't try
2066 to move threads out of the jump pads, as it could deadlock the
2067 inferior (LWP could be in the jump pad, maybe even holding the
2070 /* Do any necessary step collect actions. */
2071 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2073 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2075 /* See if we just hit a tracepoint and do its main collect
2077 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2079 lwp_suspended_decr (lwp
);
2081 gdb_assert (lwp
->suspended
== 0);
2082 gdb_assert (!stabilizing_threads
2083 || (lwp
->collecting_fast_tracepoint
2084 != fast_tpoint_collect_result::not_collecting
));
2086 if (tpoint_related_event
)
2089 debug_printf ("got a tracepoint event\n");
2096 /* Convenience wrapper. Returns information about LWP's fast tracepoint
2097 collection status. */
2099 static fast_tpoint_collect_result
2100 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2101 struct fast_tpoint_collect_status
*status
)
2103 CORE_ADDR thread_area
;
2104 struct thread_info
*thread
= get_lwp_thread (lwp
);
2106 if (the_low_target
.get_thread_area
== NULL
)
2107 return fast_tpoint_collect_result::not_collecting
;
2109 /* Get the thread area address. This is used to recognize which
2110 thread is which when tracing with the in-process agent library.
2111 We don't read anything from the address, and treat it as opaque;
2112 it's the address itself that we assume is unique per-thread. */
2113 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2114 return fast_tpoint_collect_result::not_collecting
;
2116 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2119 /* The reason we resume in the caller, is because we want to be able
2120 to pass lwp->status_pending as WSTAT, and we need to clear
2121 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2122 refuses to resume. */
2125 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2127 struct thread_info
*saved_thread
;
2129 saved_thread
= current_thread
;
2130 current_thread
= get_lwp_thread (lwp
);
2133 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2134 && supports_fast_tracepoints ()
2135 && agent_loaded_p ())
2137 struct fast_tpoint_collect_status status
;
2140 debug_printf ("Checking whether LWP %ld needs to move out of the "
2142 lwpid_of (current_thread
));
2144 fast_tpoint_collect_result r
2145 = linux_fast_tracepoint_collecting (lwp
, &status
);
2148 || (WSTOPSIG (*wstat
) != SIGILL
2149 && WSTOPSIG (*wstat
) != SIGFPE
2150 && WSTOPSIG (*wstat
) != SIGSEGV
2151 && WSTOPSIG (*wstat
) != SIGBUS
))
2153 lwp
->collecting_fast_tracepoint
= r
;
2155 if (r
!= fast_tpoint_collect_result::not_collecting
)
2157 if (r
== fast_tpoint_collect_result::before_insn
2158 && lwp
->exit_jump_pad_bkpt
== NULL
)
2160 /* Haven't executed the original instruction yet.
2161 Set breakpoint there, and wait till it's hit,
2162 then single-step until exiting the jump pad. */
2163 lwp
->exit_jump_pad_bkpt
2164 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2168 debug_printf ("Checking whether LWP %ld needs to move out of "
2169 "the jump pad...it does\n",
2170 lwpid_of (current_thread
));
2171 current_thread
= saved_thread
;
2178 /* If we get a synchronous signal while collecting, *and*
2179 while executing the (relocated) original instruction,
2180 reset the PC to point at the tpoint address, before
2181 reporting to GDB. Otherwise, it's an IPA lib bug: just
2182 report the signal to GDB, and pray for the best. */
2184 lwp
->collecting_fast_tracepoint
2185 = fast_tpoint_collect_result::not_collecting
;
2187 if (r
!= fast_tpoint_collect_result::not_collecting
2188 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2189 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2192 struct regcache
*regcache
;
2194 /* The si_addr on a few signals references the address
2195 of the faulting instruction. Adjust that as
2197 if ((WSTOPSIG (*wstat
) == SIGILL
2198 || WSTOPSIG (*wstat
) == SIGFPE
2199 || WSTOPSIG (*wstat
) == SIGBUS
2200 || WSTOPSIG (*wstat
) == SIGSEGV
)
2201 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2202 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2203 /* Final check just to make sure we don't clobber
2204 the siginfo of non-kernel-sent signals. */
2205 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2207 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2208 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2209 (PTRACE_TYPE_ARG3
) 0, &info
);
2212 regcache
= get_thread_regcache (current_thread
, 1);
2213 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2214 lwp
->stop_pc
= status
.tpoint_addr
;
2216 /* Cancel any fast tracepoint lock this thread was
2218 force_unlock_trace_buffer ();
2221 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2224 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2225 "stopping all threads momentarily.\n");
2227 stop_all_lwps (1, lwp
);
2229 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2230 lwp
->exit_jump_pad_bkpt
= NULL
;
2232 unstop_all_lwps (1, lwp
);
2234 gdb_assert (lwp
->suspended
>= 0);
2240 debug_printf ("Checking whether LWP %ld needs to move out of the "
2242 lwpid_of (current_thread
));
2244 current_thread
= saved_thread
;
2248 /* Enqueue one signal in the "signals to report later when out of the
2252 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2254 struct pending_signals
*p_sig
;
2255 struct thread_info
*thread
= get_lwp_thread (lwp
);
2258 debug_printf ("Deferring signal %d for LWP %ld.\n",
2259 WSTOPSIG (*wstat
), lwpid_of (thread
));
2263 struct pending_signals
*sig
;
2265 for (sig
= lwp
->pending_signals_to_report
;
2268 debug_printf (" Already queued %d\n",
2271 debug_printf (" (no more currently queued signals)\n");
2274 /* Don't enqueue non-RT signals if they are already in the deferred
2275 queue. (SIGSTOP being the easiest signal to see ending up here
2277 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2279 struct pending_signals
*sig
;
2281 for (sig
= lwp
->pending_signals_to_report
;
2285 if (sig
->signal
== WSTOPSIG (*wstat
))
2288 debug_printf ("Not requeuing already queued non-RT signal %d"
2297 p_sig
= XCNEW (struct pending_signals
);
2298 p_sig
->prev
= lwp
->pending_signals_to_report
;
2299 p_sig
->signal
= WSTOPSIG (*wstat
);
2301 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2304 lwp
->pending_signals_to_report
= p_sig
;
2307 /* Dequeue one signal from the "signals to report later when out of
2308 the jump pad" list. */
2311 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2313 struct thread_info
*thread
= get_lwp_thread (lwp
);
2315 if (lwp
->pending_signals_to_report
!= NULL
)
2317 struct pending_signals
**p_sig
;
2319 p_sig
= &lwp
->pending_signals_to_report
;
2320 while ((*p_sig
)->prev
!= NULL
)
2321 p_sig
= &(*p_sig
)->prev
;
2323 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2324 if ((*p_sig
)->info
.si_signo
!= 0)
2325 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2331 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2332 WSTOPSIG (*wstat
), lwpid_of (thread
));
2336 struct pending_signals
*sig
;
2338 for (sig
= lwp
->pending_signals_to_report
;
2341 debug_printf (" Still queued %d\n",
2344 debug_printf (" (no more queued signals)\n");
2353 /* Fetch the possibly triggered data watchpoint info and store it in
2356 On some archs, like x86, that use debug registers to set
2357 watchpoints, it's possible that the way to know which watched
2358 address trapped, is to check the register that is used to select
2359 which address to watch. Problem is, between setting the watchpoint
2360 and reading back which data address trapped, the user may change
2361 the set of watchpoints, and, as a consequence, GDB changes the
2362 debug registers in the inferior. To avoid reading back a stale
2363 stopped-data-address when that happens, we cache in LP the fact
2364 that a watchpoint trapped, and the corresponding data address, as
2365 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2366 registers meanwhile, we have the cached data we can rely on. */
2369 check_stopped_by_watchpoint (struct lwp_info
*child
)
2371 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2373 struct thread_info
*saved_thread
;
2375 saved_thread
= current_thread
;
2376 current_thread
= get_lwp_thread (child
);
2378 if (the_low_target
.stopped_by_watchpoint ())
2380 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2382 if (the_low_target
.stopped_data_address
!= NULL
)
2383 child
->stopped_data_address
2384 = the_low_target
.stopped_data_address ();
2386 child
->stopped_data_address
= 0;
2389 current_thread
= saved_thread
;
2392 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2395 /* Return the ptrace options that we want to try to enable. */
2398 linux_low_ptrace_options (int attached
)
2403 options
|= PTRACE_O_EXITKILL
;
2405 if (report_fork_events
)
2406 options
|= PTRACE_O_TRACEFORK
;
2408 if (report_vfork_events
)
2409 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2411 if (report_exec_events
)
2412 options
|= PTRACE_O_TRACEEXEC
;
2414 options
|= PTRACE_O_TRACESYSGOOD
;
2419 /* Do low-level handling of the event, and check if we should go on
2420 and pass it to caller code. Return the affected lwp if we are, or
2423 static struct lwp_info
*
2424 linux_low_filter_event (int lwpid
, int wstat
)
2426 struct lwp_info
*child
;
2427 struct thread_info
*thread
;
2428 int have_stop_pc
= 0;
2430 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2432 /* Check for stop events reported by a process we didn't already
2433 know about - anything not already in our LWP list.
2435 If we're expecting to receive stopped processes after
2436 fork, vfork, and clone events, then we'll just add the
2437 new one to our list and go back to waiting for the event
2438 to be reported - the stopped process might be returned
2439 from waitpid before or after the event is.
2441 But note the case of a non-leader thread exec'ing after the
2442 leader having exited, and gone from our lists (because
2443 check_zombie_leaders deleted it). The non-leader thread
2444 changes its tid to the tgid. */
2446 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2447 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2451 /* A multi-thread exec after we had seen the leader exiting. */
2454 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2455 "after exec.\n", lwpid
);
2458 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2459 child
= add_lwp (child_ptid
);
2461 current_thread
= child
->thread
;
2464 /* If we didn't find a process, one of two things presumably happened:
2465 - A process we started and then detached from has exited. Ignore it.
2466 - A process we are controlling has forked and the new child's stop
2467 was reported to us by the kernel. Save its PID. */
2468 if (child
== NULL
&& WIFSTOPPED (wstat
))
2470 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2473 else if (child
== NULL
)
2476 thread
= get_lwp_thread (child
);
2480 child
->last_status
= wstat
;
2482 /* Check if the thread has exited. */
2483 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2486 debug_printf ("LLFE: %d exited.\n", lwpid
);
2488 if (finish_step_over (child
))
2490 /* Unsuspend all other LWPs, and set them back running again. */
2491 unsuspend_all_lwps (child
);
2494 /* If there is at least one more LWP, then the exit signal was
2495 not the end of the debugged application and should be
2496 ignored, unless GDB wants to hear about thread exits. */
2497 if (report_thread_events
2498 || last_thread_of_process_p (pid_of (thread
)))
2500 /* Since events are serialized to GDB core, and we can't
2501 report this one right now. Leave the status pending for
2502 the next time we're able to report it. */
2503 mark_lwp_dead (child
, wstat
);
2513 gdb_assert (WIFSTOPPED (wstat
));
2515 if (WIFSTOPPED (wstat
))
2517 struct process_info
*proc
;
2519 /* Architecture-specific setup after inferior is running. */
2520 proc
= find_process_pid (pid_of (thread
));
2521 if (proc
->tdesc
== NULL
)
2525 /* This needs to happen after we have attached to the
2526 inferior and it is stopped for the first time, but
2527 before we access any inferior registers. */
2528 linux_arch_setup_thread (thread
);
2532 /* The process is started, but GDBserver will do
2533 architecture-specific setup after the program stops at
2534 the first instruction. */
2535 child
->status_pending_p
= 1;
2536 child
->status_pending
= wstat
;
2542 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2544 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2545 int options
= linux_low_ptrace_options (proc
->attached
);
2547 linux_enable_event_reporting (lwpid
, options
);
2548 child
->must_set_ptrace_flags
= 0;
2551 /* Always update syscall_state, even if it will be filtered later. */
2552 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2554 child
->syscall_state
2555 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2556 ? TARGET_WAITKIND_SYSCALL_RETURN
2557 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2561 /* Almost all other ptrace-stops are known to be outside of system
2562 calls, with further exceptions in handle_extended_wait. */
2563 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2566 /* Be careful to not overwrite stop_pc until save_stop_reason is
2568 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2569 && linux_is_extended_waitstatus (wstat
))
2571 child
->stop_pc
= get_pc (child
);
2572 if (handle_extended_wait (&child
, wstat
))
2574 /* The event has been handled, so just return without
2580 if (linux_wstatus_maybe_breakpoint (wstat
))
2582 if (save_stop_reason (child
))
2587 child
->stop_pc
= get_pc (child
);
2589 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2590 && child
->stop_expected
)
2593 debug_printf ("Expected stop.\n");
2594 child
->stop_expected
= 0;
2596 if (thread
->last_resume_kind
== resume_stop
)
2598 /* We want to report the stop to the core. Treat the
2599 SIGSTOP as a normal event. */
2601 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2602 target_pid_to_str (ptid_of (thread
)));
2604 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2606 /* Stopping threads. We don't want this SIGSTOP to end up
2609 debug_printf ("LLW: SIGSTOP caught for %s "
2610 "while stopping threads.\n",
2611 target_pid_to_str (ptid_of (thread
)));
2616 /* This is a delayed SIGSTOP. Filter out the event. */
2618 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2619 child
->stepping
? "step" : "continue",
2620 target_pid_to_str (ptid_of (thread
)));
2622 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2627 child
->status_pending_p
= 1;
2628 child
->status_pending
= wstat
;
2632 /* Return true if THREAD is doing hardware single step. */
2635 maybe_hw_step (struct thread_info
*thread
)
2637 if (can_hardware_single_step ())
2641 /* GDBserver must insert single-step breakpoint for software
2643 gdb_assert (has_single_step_breakpoints (thread
));
2648 /* Resume LWPs that are currently stopped without any pending status
2649 to report, but are resumed from the core's perspective. */
2652 resume_stopped_resumed_lwps (thread_info
*thread
)
2654 struct lwp_info
*lp
= get_thread_lwp (thread
);
2658 && !lp
->status_pending_p
2659 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2663 if (thread
->last_resume_kind
== resume_step
)
2664 step
= maybe_hw_step (thread
);
2667 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2668 target_pid_to_str (ptid_of (thread
)),
2669 paddress (lp
->stop_pc
),
2672 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2676 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2677 match FILTER_PTID (leaving others pending). The PTIDs can be:
2678 minus_one_ptid, to specify any child; a pid PTID, specifying all
2679 lwps of a thread group; or a PTID representing a single lwp. Store
2680 the stop status through the status pointer WSTAT. OPTIONS is
2681 passed to the waitpid call. Return 0 if no event was found and
2682 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2683 was found. Return the PID of the stopped child otherwise. */
2686 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2687 int *wstatp
, int options
)
2689 struct thread_info
*event_thread
;
2690 struct lwp_info
*event_child
, *requested_child
;
2691 sigset_t block_mask
, prev_mask
;
2694 /* N.B. event_thread points to the thread_info struct that contains
2695 event_child. Keep them in sync. */
2696 event_thread
= NULL
;
2698 requested_child
= NULL
;
2700 /* Check for a lwp with a pending status. */
2702 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2704 event_thread
= (struct thread_info
*)
2705 find_inferior_in_random (&all_threads
, status_pending_p_callback
,
2707 if (event_thread
!= NULL
)
2708 event_child
= get_thread_lwp (event_thread
);
2709 if (debug_threads
&& event_thread
)
2710 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2712 else if (!ptid_equal (filter_ptid
, null_ptid
))
2714 requested_child
= find_lwp_pid (filter_ptid
);
2716 if (stopping_threads
== NOT_STOPPING_THREADS
2717 && requested_child
->status_pending_p
2718 && (requested_child
->collecting_fast_tracepoint
2719 != fast_tpoint_collect_result::not_collecting
))
2721 enqueue_one_deferred_signal (requested_child
,
2722 &requested_child
->status_pending
);
2723 requested_child
->status_pending_p
= 0;
2724 requested_child
->status_pending
= 0;
2725 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2728 if (requested_child
->suspended
2729 && requested_child
->status_pending_p
)
2731 internal_error (__FILE__
, __LINE__
,
2732 "requesting an event out of a"
2733 " suspended child?");
2736 if (requested_child
->status_pending_p
)
2738 event_child
= requested_child
;
2739 event_thread
= get_lwp_thread (event_child
);
2743 if (event_child
!= NULL
)
2746 debug_printf ("Got an event from pending child %ld (%04x)\n",
2747 lwpid_of (event_thread
), event_child
->status_pending
);
2748 *wstatp
= event_child
->status_pending
;
2749 event_child
->status_pending_p
= 0;
2750 event_child
->status_pending
= 0;
2751 current_thread
= event_thread
;
2752 return lwpid_of (event_thread
);
2755 /* But if we don't find a pending event, we'll have to wait.
2757 We only enter this loop if no process has a pending wait status.
2758 Thus any action taken in response to a wait status inside this
2759 loop is responding as soon as we detect the status, not after any
2762 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2763 all signals while here. */
2764 sigfillset (&block_mask
);
2765 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2767 /* Always pull all events out of the kernel. We'll randomly select
2768 an event LWP out of all that have events, to prevent
2770 while (event_child
== NULL
)
2774 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2777 - If the thread group leader exits while other threads in the
2778 thread group still exist, waitpid(TGID, ...) hangs. That
2779 waitpid won't return an exit status until the other threads
2780 in the group are reaped.
2782 - When a non-leader thread execs, that thread just vanishes
2783 without reporting an exit (so we'd hang if we waited for it
2784 explicitly in that case). The exec event is reported to
2787 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2790 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2791 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2797 debug_printf ("LLW: waitpid %ld received %s\n",
2798 (long) ret
, status_to_str (*wstatp
));
2801 /* Filter all events. IOW, leave all events pending. We'll
2802 randomly select an event LWP out of all that have events
2804 linux_low_filter_event (ret
, *wstatp
);
2805 /* Retry until nothing comes out of waitpid. A single
2806 SIGCHLD can indicate more than one child stopped. */
2810 /* Now that we've pulled all events out of the kernel, resume
2811 LWPs that don't have an interesting event to report. */
2812 if (stopping_threads
== NOT_STOPPING_THREADS
)
2813 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2815 /* ... and find an LWP with a status to report to the core, if
2817 event_thread
= (struct thread_info
*)
2818 find_inferior_in_random (&all_threads
, status_pending_p_callback
,
2820 if (event_thread
!= NULL
)
2822 event_child
= get_thread_lwp (event_thread
);
2823 *wstatp
= event_child
->status_pending
;
2824 event_child
->status_pending_p
= 0;
2825 event_child
->status_pending
= 0;
2829 /* Check for zombie thread group leaders. Those can't be reaped
2830 until all other threads in the thread group are. */
2831 check_zombie_leaders ();
2833 /* If there are no resumed children left in the set of LWPs we
2834 want to wait for, bail. We can't just block in
2835 waitpid/sigsuspend, because lwps might have been left stopped
2836 in trace-stop state, and we'd be stuck forever waiting for
2837 their status to change (which would only happen if we resumed
2838 them). Even if WNOHANG is set, this return code is preferred
2839 over 0 (below), as it is more detailed. */
2840 if ((find_inferior (&all_threads
,
2841 not_stopped_callback
,
2842 &wait_ptid
) == NULL
))
2845 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2846 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2850 /* No interesting event to report to the caller. */
2851 if ((options
& WNOHANG
))
2854 debug_printf ("WNOHANG set, no event found\n");
2856 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2860 /* Block until we get an event reported with SIGCHLD. */
2862 debug_printf ("sigsuspend'ing\n");
2864 sigsuspend (&prev_mask
);
2865 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2869 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2871 current_thread
= event_thread
;
2873 return lwpid_of (event_thread
);
2876 /* Wait for an event from child(ren) PTID. PTIDs can be:
2877 minus_one_ptid, to specify any child; a pid PTID, specifying all
2878 lwps of a thread group; or a PTID representing a single lwp. Store
2879 the stop status through the status pointer WSTAT. OPTIONS is
2880 passed to the waitpid call. Return 0 if no event was found and
2881 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2882 was found. Return the PID of the stopped child otherwise. */
2885 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2887 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2890 /* Count the LWP's that have had events. */
2893 count_events_callback (thread_info
*thread
, void *data
)
2895 struct lwp_info
*lp
= get_thread_lwp (thread
);
2896 int *count
= (int *) data
;
2898 gdb_assert (count
!= NULL
);
2900 /* Count only resumed LWPs that have an event pending. */
2901 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2902 && lp
->status_pending_p
)
2908 /* Select the LWP (if any) that is currently being single-stepped. */
2911 select_singlestep_lwp_callback (thread_info
*thread
, void *data
)
2913 struct lwp_info
*lp
= get_thread_lwp (thread
);
2915 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2916 && thread
->last_resume_kind
== resume_step
2917 && lp
->status_pending_p
)
2923 /* Select the Nth LWP that has had an event. */
2926 select_event_lwp_callback (thread_info
*thread
, void *data
)
2928 struct lwp_info
*lp
= get_thread_lwp (thread
);
2929 int *selector
= (int *) data
;
2931 gdb_assert (selector
!= NULL
);
2933 /* Select only resumed LWPs that have an event pending. */
2934 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2935 && lp
->status_pending_p
)
2936 if ((*selector
)-- == 0)
2942 /* Select one LWP out of those that have events pending. */
2945 select_event_lwp (struct lwp_info
**orig_lp
)
2948 int random_selector
;
2949 struct thread_info
*event_thread
= NULL
;
2951 /* In all-stop, give preference to the LWP that is being
2952 single-stepped. There will be at most one, and it's the LWP that
2953 the core is most interested in. If we didn't do this, then we'd
2954 have to handle pending step SIGTRAPs somehow in case the core
2955 later continues the previously-stepped thread, otherwise we'd
2956 report the pending SIGTRAP, and the core, not having stepped the
2957 thread, wouldn't understand what the trap was for, and therefore
2958 would report it to the user as a random signal. */
2962 = (struct thread_info
*) find_inferior (&all_threads
,
2963 select_singlestep_lwp_callback
,
2965 if (event_thread
!= NULL
)
2968 debug_printf ("SEL: Select single-step %s\n",
2969 target_pid_to_str (ptid_of (event_thread
)));
2972 if (event_thread
== NULL
)
2974 /* No single-stepping LWP. Select one at random, out of those
2975 which have had events. */
2977 /* First see how many events we have. */
2978 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2979 gdb_assert (num_events
> 0);
2981 /* Now randomly pick a LWP out of those that have had
2983 random_selector
= (int)
2984 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2986 if (debug_threads
&& num_events
> 1)
2987 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2988 num_events
, random_selector
);
2991 = (struct thread_info
*) find_inferior (&all_threads
,
2992 select_event_lwp_callback
,
2996 if (event_thread
!= NULL
)
2998 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
3000 /* Switch the event LWP. */
3001 *orig_lp
= event_lp
;
3005 /* Decrement the suspend count of an LWP. */
3008 unsuspend_one_lwp (thread_info
*thread
, void *except
)
3010 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3012 /* Ignore EXCEPT. */
3016 lwp_suspended_decr (lwp
);
3020 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
3024 unsuspend_all_lwps (struct lwp_info
*except
)
3026 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
3029 static void move_out_of_jump_pad_callback (thread_info
*thread
);
3030 static int stuck_in_jump_pad_callback (thread_info
*thread
, void *data
);
3031 static int lwp_running (thread_info
*thread
, void *data
);
3032 static ptid_t
linux_wait_1 (ptid_t ptid
,
3033 struct target_waitstatus
*ourstatus
,
3034 int target_options
);
3036 /* Stabilize threads (move out of jump pads).
3038 If a thread is midway collecting a fast tracepoint, we need to
3039 finish the collection and move it out of the jump pad before
3040 reporting the signal.
3042 This avoids recursion while collecting (when a signal arrives
3043 midway, and the signal handler itself collects), which would trash
3044 the trace buffer. In case the user set a breakpoint in a signal
3045 handler, this avoids the backtrace showing the jump pad, etc..
3046 Most importantly, there are certain things we can't do safely if
3047 threads are stopped in a jump pad (or in its callee's). For
3050 - starting a new trace run. A thread still collecting the
3051 previous run, could trash the trace buffer when resumed. The trace
3052 buffer control structures would have been reset but the thread had
3053 no way to tell. The thread could even midway memcpy'ing to the
3054 buffer, which would mean that when resumed, it would clobber the
3055 trace buffer that had been set for a new run.
3057 - we can't rewrite/reuse the jump pads for new tracepoints
3058 safely. Say you do tstart while a thread is stopped midway while
3059 collecting. When the thread is later resumed, it finishes the
3060 collection, and returns to the jump pad, to execute the original
3061 instruction that was under the tracepoint jump at the time the
3062 older run had been started. If the jump pad had been rewritten
3063 since for something else in the new run, the thread would now
3064 execute the wrong / random instructions. */
3067 linux_stabilize_threads (void)
3069 struct thread_info
*saved_thread
;
3070 struct thread_info
*thread_stuck
;
3073 = (struct thread_info
*) find_inferior (&all_threads
,
3074 stuck_in_jump_pad_callback
,
3076 if (thread_stuck
!= NULL
)
3079 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
3080 lwpid_of (thread_stuck
));
3084 saved_thread
= current_thread
;
3086 stabilizing_threads
= 1;
3089 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
3091 /* Loop until all are stopped out of the jump pads. */
3092 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
3094 struct target_waitstatus ourstatus
;
3095 struct lwp_info
*lwp
;
3098 /* Note that we go through the full wait even loop. While
3099 moving threads out of jump pad, we need to be able to step
3100 over internal breakpoints and such. */
3101 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
3103 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
3105 lwp
= get_thread_lwp (current_thread
);
3108 lwp_suspended_inc (lwp
);
3110 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3111 || current_thread
->last_resume_kind
== resume_stop
)
3113 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3114 enqueue_one_deferred_signal (lwp
, &wstat
);
3119 unsuspend_all_lwps (NULL
);
3121 stabilizing_threads
= 0;
3123 current_thread
= saved_thread
;
3128 = (struct thread_info
*) find_inferior (&all_threads
,
3129 stuck_in_jump_pad_callback
,
3131 if (thread_stuck
!= NULL
)
3132 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3133 lwpid_of (thread_stuck
));
3137 /* Convenience function that is called when the kernel reports an
3138 event that is not passed out to GDB. */
3141 ignore_event (struct target_waitstatus
*ourstatus
)
3143 /* If we got an event, there may still be others, as a single
3144 SIGCHLD can indicate more than one child stopped. This forces
3145 another target_wait call. */
3148 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3152 /* Convenience function that is called when the kernel reports an exit
3153 event. This decides whether to report the event to GDB as a
3154 process exit event, a thread exit event, or to suppress the
3158 filter_exit_event (struct lwp_info
*event_child
,
3159 struct target_waitstatus
*ourstatus
)
3161 struct thread_info
*thread
= get_lwp_thread (event_child
);
3162 ptid_t ptid
= ptid_of (thread
);
3164 if (!last_thread_of_process_p (pid_of (thread
)))
3166 if (report_thread_events
)
3167 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3169 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3171 delete_lwp (event_child
);
3176 /* Returns 1 if GDB is interested in any event_child syscalls. */
3179 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3181 struct thread_info
*thread
= get_lwp_thread (event_child
);
3182 struct process_info
*proc
= get_thread_process (thread
);
3184 return !proc
->syscalls_to_catch
.empty ();
3187 /* Returns 1 if GDB is interested in the event_child syscall.
3188 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3191 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3194 struct thread_info
*thread
= get_lwp_thread (event_child
);
3195 struct process_info
*proc
= get_thread_process (thread
);
3197 if (proc
->syscalls_to_catch
.empty ())
3200 if (proc
->syscalls_to_catch
[0] == ANY_SYSCALL
)
3203 get_syscall_trapinfo (event_child
, &sysno
);
3205 for (int iter
: proc
->syscalls_to_catch
)
3212 /* Wait for process, returns status. */
3215 linux_wait_1 (ptid_t ptid
,
3216 struct target_waitstatus
*ourstatus
, int target_options
)
3219 struct lwp_info
*event_child
;
3222 int step_over_finished
;
3223 int bp_explains_trap
;
3224 int maybe_internal_trap
;
3233 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3236 /* Translate generic target options into linux options. */
3238 if (target_options
& TARGET_WNOHANG
)
3241 bp_explains_trap
= 0;
3244 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3246 /* Find a resumed LWP, if any. */
3247 if (find_inferior (&all_threads
,
3248 status_pending_p_callback
,
3249 &minus_one_ptid
) != NULL
)
3251 else if ((find_inferior (&all_threads
,
3252 not_stopped_callback
,
3253 &minus_one_ptid
) != NULL
))
3258 if (ptid_equal (step_over_bkpt
, null_ptid
))
3259 pid
= linux_wait_for_event (ptid
, &w
, options
);
3263 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3264 target_pid_to_str (step_over_bkpt
));
3265 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3268 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3270 gdb_assert (target_options
& TARGET_WNOHANG
);
3274 debug_printf ("linux_wait_1 ret = null_ptid, "
3275 "TARGET_WAITKIND_IGNORE\n");
3279 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3286 debug_printf ("linux_wait_1 ret = null_ptid, "
3287 "TARGET_WAITKIND_NO_RESUMED\n");
3291 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3295 event_child
= get_thread_lwp (current_thread
);
3297 /* linux_wait_for_event only returns an exit status for the last
3298 child of a process. Report it. */
3299 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3303 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3304 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3308 debug_printf ("linux_wait_1 ret = %s, exited with "
3310 target_pid_to_str (ptid_of (current_thread
)),
3317 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3318 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3322 debug_printf ("linux_wait_1 ret = %s, terminated with "
3324 target_pid_to_str (ptid_of (current_thread
)),
3330 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3331 return filter_exit_event (event_child
, ourstatus
);
3333 return ptid_of (current_thread
);
3336 /* If step-over executes a breakpoint instruction, in the case of a
3337 hardware single step it means a gdb/gdbserver breakpoint had been
3338 planted on top of a permanent breakpoint, in the case of a software
3339 single step it may just mean that gdbserver hit the reinsert breakpoint.
3340 The PC has been adjusted by save_stop_reason to point at
3341 the breakpoint address.
3342 So in the case of the hardware single step advance the PC manually
3343 past the breakpoint and in the case of software single step advance only
3344 if it's not the single_step_breakpoint we are hitting.
3345 This avoids that a program would keep trapping a permanent breakpoint
3347 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3348 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3349 && (event_child
->stepping
3350 || !single_step_breakpoint_inserted_here (event_child
->stop_pc
)))
3352 int increment_pc
= 0;
3353 int breakpoint_kind
= 0;
3354 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3357 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3358 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3362 debug_printf ("step-over for %s executed software breakpoint\n",
3363 target_pid_to_str (ptid_of (current_thread
)));
3366 if (increment_pc
!= 0)
3368 struct regcache
*regcache
3369 = get_thread_regcache (current_thread
, 1);
3371 event_child
->stop_pc
+= increment_pc
;
3372 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3374 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3375 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3379 /* If this event was not handled before, and is not a SIGTRAP, we
3380 report it. SIGILL and SIGSEGV are also treated as traps in case
3381 a breakpoint is inserted at the current PC. If this target does
3382 not support internal breakpoints at all, we also report the
3383 SIGTRAP without further processing; it's of no concern to us. */
3385 = (supports_breakpoints ()
3386 && (WSTOPSIG (w
) == SIGTRAP
3387 || ((WSTOPSIG (w
) == SIGILL
3388 || WSTOPSIG (w
) == SIGSEGV
)
3389 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3391 if (maybe_internal_trap
)
3393 /* Handle anything that requires bookkeeping before deciding to
3394 report the event or continue waiting. */
3396 /* First check if we can explain the SIGTRAP with an internal
3397 breakpoint, or if we should possibly report the event to GDB.
3398 Do this before anything that may remove or insert a
3400 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3402 /* We have a SIGTRAP, possibly a step-over dance has just
3403 finished. If so, tweak the state machine accordingly,
3404 reinsert breakpoints and delete any single-step
3406 step_over_finished
= finish_step_over (event_child
);
3408 /* Now invoke the callbacks of any internal breakpoints there. */
3409 check_breakpoints (event_child
->stop_pc
);
3411 /* Handle tracepoint data collecting. This may overflow the
3412 trace buffer, and cause a tracing stop, removing
3414 trace_event
= handle_tracepoints (event_child
);
3416 if (bp_explains_trap
)
3419 debug_printf ("Hit a gdbserver breakpoint.\n");
3424 /* We have some other signal, possibly a step-over dance was in
3425 progress, and it should be cancelled too. */
3426 step_over_finished
= finish_step_over (event_child
);
3429 /* We have all the data we need. Either report the event to GDB, or
3430 resume threads and keep waiting for more. */
3432 /* If we're collecting a fast tracepoint, finish the collection and
3433 move out of the jump pad before delivering a signal. See
3434 linux_stabilize_threads. */
3437 && WSTOPSIG (w
) != SIGTRAP
3438 && supports_fast_tracepoints ()
3439 && agent_loaded_p ())
3442 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3443 "to defer or adjust it.\n",
3444 WSTOPSIG (w
), lwpid_of (current_thread
));
3446 /* Allow debugging the jump pad itself. */
3447 if (current_thread
->last_resume_kind
!= resume_step
3448 && maybe_move_out_of_jump_pad (event_child
, &w
))
3450 enqueue_one_deferred_signal (event_child
, &w
);
3453 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3454 WSTOPSIG (w
), lwpid_of (current_thread
));
3456 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3460 return ignore_event (ourstatus
);
3464 if (event_child
->collecting_fast_tracepoint
3465 != fast_tpoint_collect_result::not_collecting
)
3468 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3469 "Check if we're already there.\n",
3470 lwpid_of (current_thread
),
3471 (int) event_child
->collecting_fast_tracepoint
);
3475 event_child
->collecting_fast_tracepoint
3476 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3478 if (event_child
->collecting_fast_tracepoint
3479 != fast_tpoint_collect_result::before_insn
)
3481 /* No longer need this breakpoint. */
3482 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3485 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3486 "stopping all threads momentarily.\n");
3488 /* Other running threads could hit this breakpoint.
3489 We don't handle moribund locations like GDB does,
3490 instead we always pause all threads when removing
3491 breakpoints, so that any step-over or
3492 decr_pc_after_break adjustment is always taken
3493 care of while the breakpoint is still
3495 stop_all_lwps (1, event_child
);
3497 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3498 event_child
->exit_jump_pad_bkpt
= NULL
;
3500 unstop_all_lwps (1, event_child
);
3502 gdb_assert (event_child
->suspended
>= 0);
3506 if (event_child
->collecting_fast_tracepoint
3507 == fast_tpoint_collect_result::not_collecting
)
3510 debug_printf ("fast tracepoint finished "
3511 "collecting successfully.\n");
3513 /* We may have a deferred signal to report. */
3514 if (dequeue_one_deferred_signal (event_child
, &w
))
3517 debug_printf ("dequeued one signal.\n");
3522 debug_printf ("no deferred signals.\n");
3524 if (stabilizing_threads
)
3526 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3527 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3531 debug_printf ("linux_wait_1 ret = %s, stopped "
3532 "while stabilizing threads\n",
3533 target_pid_to_str (ptid_of (current_thread
)));
3537 return ptid_of (current_thread
);
3543 /* Check whether GDB would be interested in this event. */
3545 /* Check if GDB is interested in this syscall. */
3547 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3548 && !gdb_catch_this_syscall_p (event_child
))
3552 debug_printf ("Ignored syscall for LWP %ld.\n",
3553 lwpid_of (current_thread
));
3556 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3561 return ignore_event (ourstatus
);
3564 /* If GDB is not interested in this signal, don't stop other
3565 threads, and don't report it to GDB. Just resume the inferior
3566 right away. We do this for threading-related signals as well as
3567 any that GDB specifically requested we ignore. But never ignore
3568 SIGSTOP if we sent it ourselves, and do not ignore signals when
3569 stepping - they may require special handling to skip the signal
3570 handler. Also never ignore signals that could be caused by a
3573 && current_thread
->last_resume_kind
!= resume_step
3575 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3576 (current_process ()->priv
->thread_db
!= NULL
3577 && (WSTOPSIG (w
) == __SIGRTMIN
3578 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3581 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3582 && !(WSTOPSIG (w
) == SIGSTOP
3583 && current_thread
->last_resume_kind
== resume_stop
)
3584 && !linux_wstatus_maybe_breakpoint (w
))))
3586 siginfo_t info
, *info_p
;
3589 debug_printf ("Ignored signal %d for LWP %ld.\n",
3590 WSTOPSIG (w
), lwpid_of (current_thread
));
3592 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3593 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3598 if (step_over_finished
)
3600 /* We cancelled this thread's step-over above. We still
3601 need to unsuspend all other LWPs, and set them back
3602 running again while the signal handler runs. */
3603 unsuspend_all_lwps (event_child
);
3605 /* Enqueue the pending signal info so that proceed_all_lwps
3607 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3609 proceed_all_lwps ();
3613 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3614 WSTOPSIG (w
), info_p
);
3620 return ignore_event (ourstatus
);
3623 /* Note that all addresses are always "out of the step range" when
3624 there's no range to begin with. */
3625 in_step_range
= lwp_in_step_range (event_child
);
3627 /* If GDB wanted this thread to single step, and the thread is out
3628 of the step range, we always want to report the SIGTRAP, and let
3629 GDB handle it. Watchpoints should always be reported. So should
3630 signals we can't explain. A SIGTRAP we can't explain could be a
3631 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3632 do, we're be able to handle GDB breakpoints on top of internal
3633 breakpoints, by handling the internal breakpoint and still
3634 reporting the event to GDB. If we don't, we're out of luck, GDB
3635 won't see the breakpoint hit. If we see a single-step event but
3636 the thread should be continuing, don't pass the trap to gdb.
3637 That indicates that we had previously finished a single-step but
3638 left the single-step pending -- see
3639 complete_ongoing_step_over. */
3640 report_to_gdb
= (!maybe_internal_trap
3641 || (current_thread
->last_resume_kind
== resume_step
3643 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3645 && !bp_explains_trap
3647 && !step_over_finished
3648 && !(current_thread
->last_resume_kind
== resume_continue
3649 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3650 || (gdb_breakpoint_here (event_child
->stop_pc
)
3651 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3652 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3653 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3655 run_breakpoint_commands (event_child
->stop_pc
);
3657 /* We found no reason GDB would want us to stop. We either hit one
3658 of our own breakpoints, or finished an internal step GDB
3659 shouldn't know about. */
3664 if (bp_explains_trap
)
3665 debug_printf ("Hit a gdbserver breakpoint.\n");
3666 if (step_over_finished
)
3667 debug_printf ("Step-over finished.\n");
3669 debug_printf ("Tracepoint event.\n");
3670 if (lwp_in_step_range (event_child
))
3671 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3672 paddress (event_child
->stop_pc
),
3673 paddress (event_child
->step_range_start
),
3674 paddress (event_child
->step_range_end
));
3677 /* We're not reporting this breakpoint to GDB, so apply the
3678 decr_pc_after_break adjustment to the inferior's regcache
3681 if (the_low_target
.set_pc
!= NULL
)
3683 struct regcache
*regcache
3684 = get_thread_regcache (current_thread
, 1);
3685 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3688 if (step_over_finished
)
3690 /* If we have finished stepping over a breakpoint, we've
3691 stopped and suspended all LWPs momentarily except the
3692 stepping one. This is where we resume them all again.
3693 We're going to keep waiting, so use proceed, which
3694 handles stepping over the next breakpoint. */
3695 unsuspend_all_lwps (event_child
);
3699 /* Remove the single-step breakpoints if any. Note that
3700 there isn't single-step breakpoint if we finished stepping
3702 if (can_software_single_step ()
3703 && has_single_step_breakpoints (current_thread
))
3705 stop_all_lwps (0, event_child
);
3706 delete_single_step_breakpoints (current_thread
);
3707 unstop_all_lwps (0, event_child
);
3712 debug_printf ("proceeding all threads.\n");
3713 proceed_all_lwps ();
3718 return ignore_event (ourstatus
);
3723 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3726 = target_waitstatus_to_string (&event_child
->waitstatus
);
3728 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3729 lwpid_of (get_lwp_thread (event_child
)), str
.c_str ());
3731 if (current_thread
->last_resume_kind
== resume_step
)
3733 if (event_child
->step_range_start
== event_child
->step_range_end
)
3734 debug_printf ("GDB wanted to single-step, reporting event.\n");
3735 else if (!lwp_in_step_range (event_child
))
3736 debug_printf ("Out of step range, reporting event.\n");
3738 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3739 debug_printf ("Stopped by watchpoint.\n");
3740 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3741 debug_printf ("Stopped by GDB breakpoint.\n");
3743 debug_printf ("Hit a non-gdbserver trap event.\n");
3746 /* Alright, we're going to report a stop. */
3748 /* Remove single-step breakpoints. */
3749 if (can_software_single_step ())
3751 /* Remove single-step breakpoints or not. It it is true, stop all
3752 lwps, so that other threads won't hit the breakpoint in the
3754 int remove_single_step_breakpoints_p
= 0;
3758 remove_single_step_breakpoints_p
3759 = has_single_step_breakpoints (current_thread
);
3763 /* In all-stop, a stop reply cancels all previous resume
3764 requests. Delete all single-step breakpoints. */
3766 find_thread ([&] (thread_info
*thread
) {
3767 if (has_single_step_breakpoints (thread
))
3769 remove_single_step_breakpoints_p
= 1;
3777 if (remove_single_step_breakpoints_p
)
3779 /* If we remove single-step breakpoints from memory, stop all lwps,
3780 so that other threads won't hit the breakpoint in the staled
3782 stop_all_lwps (0, event_child
);
3786 gdb_assert (has_single_step_breakpoints (current_thread
));
3787 delete_single_step_breakpoints (current_thread
);
3791 for_each_thread ([] (thread_info
*thread
){
3792 if (has_single_step_breakpoints (thread
))
3793 delete_single_step_breakpoints (thread
);
3797 unstop_all_lwps (0, event_child
);
3801 if (!stabilizing_threads
)
3803 /* In all-stop, stop all threads. */
3805 stop_all_lwps (0, NULL
);
3807 if (step_over_finished
)
3811 /* If we were doing a step-over, all other threads but
3812 the stepping one had been paused in start_step_over,
3813 with their suspend counts incremented. We don't want
3814 to do a full unstop/unpause, because we're in
3815 all-stop mode (so we want threads stopped), but we
3816 still need to unsuspend the other threads, to
3817 decrement their `suspended' count back. */
3818 unsuspend_all_lwps (event_child
);
3822 /* If we just finished a step-over, then all threads had
3823 been momentarily paused. In all-stop, that's fine,
3824 we want threads stopped by now anyway. In non-stop,
3825 we need to re-resume threads that GDB wanted to be
3827 unstop_all_lwps (1, event_child
);
3831 /* If we're not waiting for a specific LWP, choose an event LWP
3832 from among those that have had events. Giving equal priority
3833 to all LWPs that have had events helps prevent
3835 if (ptid_equal (ptid
, minus_one_ptid
))
3837 event_child
->status_pending_p
= 1;
3838 event_child
->status_pending
= w
;
3840 select_event_lwp (&event_child
);
3842 /* current_thread and event_child must stay in sync. */
3843 current_thread
= get_lwp_thread (event_child
);
3845 event_child
->status_pending_p
= 0;
3846 w
= event_child
->status_pending
;
3850 /* Stabilize threads (move out of jump pads). */
3852 stabilize_threads ();
3856 /* If we just finished a step-over, then all threads had been
3857 momentarily paused. In all-stop, that's fine, we want
3858 threads stopped by now anyway. In non-stop, we need to
3859 re-resume threads that GDB wanted to be running. */
3860 if (step_over_finished
)
3861 unstop_all_lwps (1, event_child
);
3864 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3866 /* If the reported event is an exit, fork, vfork or exec, let
3869 /* Break the unreported fork relationship chain. */
3870 if (event_child
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
3871 || event_child
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
)
3873 event_child
->fork_relative
->fork_relative
= NULL
;
3874 event_child
->fork_relative
= NULL
;
3877 *ourstatus
= event_child
->waitstatus
;
3878 /* Clear the event lwp's waitstatus since we handled it already. */
3879 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3882 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3884 /* Now that we've selected our final event LWP, un-adjust its PC if
3885 it was a software breakpoint, and the client doesn't know we can
3886 adjust the breakpoint ourselves. */
3887 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3888 && !swbreak_feature
)
3890 int decr_pc
= the_low_target
.decr_pc_after_break
;
3894 struct regcache
*regcache
3895 = get_thread_regcache (current_thread
, 1);
3896 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3900 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3902 get_syscall_trapinfo (event_child
,
3903 &ourstatus
->value
.syscall_number
);
3904 ourstatus
->kind
= event_child
->syscall_state
;
3906 else if (current_thread
->last_resume_kind
== resume_stop
3907 && WSTOPSIG (w
) == SIGSTOP
)
3909 /* A thread that has been requested to stop by GDB with vCont;t,
3910 and it stopped cleanly, so report as SIG0. The use of
3911 SIGSTOP is an implementation detail. */
3912 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3914 else if (current_thread
->last_resume_kind
== resume_stop
3915 && WSTOPSIG (w
) != SIGSTOP
)
3917 /* A thread that has been requested to stop by GDB with vCont;t,
3918 but, it stopped for other reasons. */
3919 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3921 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3923 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3926 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3930 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3931 target_pid_to_str (ptid_of (current_thread
)),
3932 ourstatus
->kind
, ourstatus
->value
.sig
);
3936 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3937 return filter_exit_event (event_child
, ourstatus
);
3939 return ptid_of (current_thread
);
3942 /* Get rid of any pending event in the pipe. */
3944 async_file_flush (void)
3950 ret
= read (linux_event_pipe
[0], &buf
, 1);
3951 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3954 /* Put something in the pipe, so the event loop wakes up. */
3956 async_file_mark (void)
3960 async_file_flush ();
3963 ret
= write (linux_event_pipe
[1], "+", 1);
3964 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3966 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3967 be awakened anyway. */
3971 linux_wait (ptid_t ptid
,
3972 struct target_waitstatus
*ourstatus
, int target_options
)
3976 /* Flush the async file first. */
3977 if (target_is_async_p ())
3978 async_file_flush ();
3982 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3984 while ((target_options
& TARGET_WNOHANG
) == 0
3985 && ptid_equal (event_ptid
, null_ptid
)
3986 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3988 /* If at least one stop was reported, there may be more. A single
3989 SIGCHLD can signal more than one child stop. */
3990 if (target_is_async_p ()
3991 && (target_options
& TARGET_WNOHANG
) != 0
3992 && !ptid_equal (event_ptid
, null_ptid
))
3998 /* Send a signal to an LWP. */
4001 kill_lwp (unsigned long lwpid
, int signo
)
4006 ret
= syscall (__NR_tkill
, lwpid
, signo
);
4007 if (errno
== ENOSYS
)
4009 /* If tkill fails, then we are not using nptl threads, a
4010 configuration we no longer support. */
4011 perror_with_name (("tkill"));
4017 linux_stop_lwp (struct lwp_info
*lwp
)
4023 send_sigstop (struct lwp_info
*lwp
)
4027 pid
= lwpid_of (get_lwp_thread (lwp
));
4029 /* If we already have a pending stop signal for this process, don't
4031 if (lwp
->stop_expected
)
4034 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
4040 debug_printf ("Sending sigstop to lwp %d\n", pid
);
4042 lwp
->stop_expected
= 1;
4043 kill_lwp (pid
, SIGSTOP
);
4047 send_sigstop_callback (thread_info
*thread
, void *except
)
4049 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4051 /* Ignore EXCEPT. */
4062 /* Increment the suspend count of an LWP, and stop it, if not stopped
4065 suspend_and_send_sigstop_callback (thread_info
*thread
, void *except
)
4067 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4069 /* Ignore EXCEPT. */
4073 lwp_suspended_inc (lwp
);
4075 return send_sigstop_callback (thread
, except
);
4079 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
4081 /* Store the exit status for later. */
4082 lwp
->status_pending_p
= 1;
4083 lwp
->status_pending
= wstat
;
4085 /* Store in waitstatus as well, as there's nothing else to process
4087 if (WIFEXITED (wstat
))
4089 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
4090 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
4092 else if (WIFSIGNALED (wstat
))
4094 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
4095 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
4098 /* Prevent trying to stop it. */
4101 /* No further stops are expected from a dead lwp. */
4102 lwp
->stop_expected
= 0;
4105 /* Return true if LWP has exited already, and has a pending exit event
4106 to report to GDB. */
4109 lwp_is_marked_dead (struct lwp_info
*lwp
)
4111 return (lwp
->status_pending_p
4112 && (WIFEXITED (lwp
->status_pending
)
4113 || WIFSIGNALED (lwp
->status_pending
)));
4116 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4119 wait_for_sigstop (void)
4121 struct thread_info
*saved_thread
;
4126 saved_thread
= current_thread
;
4127 if (saved_thread
!= NULL
)
4128 saved_tid
= saved_thread
->id
;
4130 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4133 debug_printf ("wait_for_sigstop: pulling events\n");
4135 /* Passing NULL_PTID as filter indicates we want all events to be
4136 left pending. Eventually this returns when there are no
4137 unwaited-for children left. */
4138 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4140 gdb_assert (ret
== -1);
4142 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4143 current_thread
= saved_thread
;
4147 debug_printf ("Previously current thread died.\n");
4149 /* We can't change the current inferior behind GDB's back,
4150 otherwise, a subsequent command may apply to the wrong
4152 current_thread
= NULL
;
4156 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
4157 move it out, because we need to report the stop event to GDB. For
4158 example, if the user puts a breakpoint in the jump pad, it's
4159 because she wants to debug it. */
4162 stuck_in_jump_pad_callback (thread_info
*thread
, void *data
)
4164 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4166 if (lwp
->suspended
!= 0)
4168 internal_error (__FILE__
, __LINE__
,
4169 "LWP %ld is suspended, suspended=%d\n",
4170 lwpid_of (thread
), lwp
->suspended
);
4172 gdb_assert (lwp
->stopped
);
4174 /* Allow debugging the jump pad, gdb_collect, etc.. */
4175 return (supports_fast_tracepoints ()
4176 && agent_loaded_p ()
4177 && (gdb_breakpoint_here (lwp
->stop_pc
)
4178 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4179 || thread
->last_resume_kind
== resume_step
)
4180 && (linux_fast_tracepoint_collecting (lwp
, NULL
)
4181 != fast_tpoint_collect_result::not_collecting
));
4185 move_out_of_jump_pad_callback (thread_info
*thread
)
4187 struct thread_info
*saved_thread
;
4188 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4191 if (lwp
->suspended
!= 0)
4193 internal_error (__FILE__
, __LINE__
,
4194 "LWP %ld is suspended, suspended=%d\n",
4195 lwpid_of (thread
), lwp
->suspended
);
4197 gdb_assert (lwp
->stopped
);
4199 /* For gdb_breakpoint_here. */
4200 saved_thread
= current_thread
;
4201 current_thread
= thread
;
4203 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4205 /* Allow debugging the jump pad, gdb_collect, etc. */
4206 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4207 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4208 && thread
->last_resume_kind
!= resume_step
4209 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4212 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4217 lwp
->status_pending_p
= 0;
4218 enqueue_one_deferred_signal (lwp
, wstat
);
4221 debug_printf ("Signal %d for LWP %ld deferred "
4223 WSTOPSIG (*wstat
), lwpid_of (thread
));
4226 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4229 lwp_suspended_inc (lwp
);
4231 current_thread
= saved_thread
;
4235 lwp_running (thread_info
*thread
, void *data
)
4237 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4239 if (lwp_is_marked_dead (lwp
))
4246 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4247 If SUSPEND, then also increase the suspend count of every LWP,
4251 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4253 /* Should not be called recursively. */
4254 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4259 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4260 suspend
? "stop-and-suspend" : "stop",
4262 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4266 stopping_threads
= (suspend
4267 ? STOPPING_AND_SUSPENDING_THREADS
4268 : STOPPING_THREADS
);
4271 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
4273 find_inferior (&all_threads
, send_sigstop_callback
, except
);
4274 wait_for_sigstop ();
4275 stopping_threads
= NOT_STOPPING_THREADS
;
4279 debug_printf ("stop_all_lwps done, setting stopping_threads "
4280 "back to !stopping\n");
4285 /* Enqueue one signal in the chain of signals which need to be
4286 delivered to this process on next resume. */
4289 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4291 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4293 p_sig
->prev
= lwp
->pending_signals
;
4294 p_sig
->signal
= signal
;
4296 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4298 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4299 lwp
->pending_signals
= p_sig
;
4302 /* Install breakpoints for software single stepping. */
4305 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4307 struct thread_info
*thread
= get_lwp_thread (lwp
);
4308 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4309 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
4311 current_thread
= thread
;
4312 std::vector
<CORE_ADDR
> next_pcs
= the_low_target
.get_next_pcs (regcache
);
4314 for (CORE_ADDR pc
: next_pcs
)
4315 set_single_step_breakpoint (pc
, current_ptid
);
4317 do_cleanups (old_chain
);
4320 /* Single step via hardware or software single step.
4321 Return 1 if hardware single stepping, 0 if software single stepping
4322 or can't single step. */
4325 single_step (struct lwp_info
* lwp
)
4329 if (can_hardware_single_step ())
4333 else if (can_software_single_step ())
4335 install_software_single_step_breakpoints (lwp
);
4341 debug_printf ("stepping is not implemented on this target");
4347 /* The signal can be delivered to the inferior if we are not trying to
4348 finish a fast tracepoint collect. Since signal can be delivered in
4349 the step-over, the program may go to signal handler and trap again
4350 after return from the signal handler. We can live with the spurious
4354 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4356 return (lwp
->collecting_fast_tracepoint
4357 == fast_tpoint_collect_result::not_collecting
);
4360 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4361 SIGNAL is nonzero, give it that signal. */
4364 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4365 int step
, int signal
, siginfo_t
*info
)
4367 struct thread_info
*thread
= get_lwp_thread (lwp
);
4368 struct thread_info
*saved_thread
;
4370 struct process_info
*proc
= get_thread_process (thread
);
4372 /* Note that target description may not be initialised
4373 (proc->tdesc == NULL) at this point because the program hasn't
4374 stopped at the first instruction yet. It means GDBserver skips
4375 the extra traps from the wrapper program (see option --wrapper).
4376 Code in this function that requires register access should be
4377 guarded by proc->tdesc == NULL or something else. */
4379 if (lwp
->stopped
== 0)
4382 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4384 fast_tpoint_collect_result fast_tp_collecting
4385 = lwp
->collecting_fast_tracepoint
;
4387 gdb_assert (!stabilizing_threads
4388 || (fast_tp_collecting
4389 != fast_tpoint_collect_result::not_collecting
));
4391 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4392 user used the "jump" command, or "set $pc = foo"). */
4393 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4395 /* Collecting 'while-stepping' actions doesn't make sense
4397 release_while_stepping_state_list (thread
);
4400 /* If we have pending signals or status, and a new signal, enqueue the
4401 signal. Also enqueue the signal if it can't be delivered to the
4402 inferior right now. */
4404 && (lwp
->status_pending_p
4405 || lwp
->pending_signals
!= NULL
4406 || !lwp_signal_can_be_delivered (lwp
)))
4408 enqueue_pending_signal (lwp
, signal
, info
);
4410 /* Postpone any pending signal. It was enqueued above. */
4414 if (lwp
->status_pending_p
)
4417 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4418 " has pending status\n",
4419 lwpid_of (thread
), step
? "step" : "continue",
4420 lwp
->stop_expected
? "expected" : "not expected");
4424 saved_thread
= current_thread
;
4425 current_thread
= thread
;
4427 /* This bit needs some thinking about. If we get a signal that
4428 we must report while a single-step reinsert is still pending,
4429 we often end up resuming the thread. It might be better to
4430 (ew) allow a stack of pending events; then we could be sure that
4431 the reinsert happened right away and not lose any signals.
4433 Making this stack would also shrink the window in which breakpoints are
4434 uninserted (see comment in linux_wait_for_lwp) but not enough for
4435 complete correctness, so it won't solve that problem. It may be
4436 worthwhile just to solve this one, however. */
4437 if (lwp
->bp_reinsert
!= 0)
4440 debug_printf (" pending reinsert at 0x%s\n",
4441 paddress (lwp
->bp_reinsert
));
4443 if (can_hardware_single_step ())
4445 if (fast_tp_collecting
== fast_tpoint_collect_result::not_collecting
)
4448 warning ("BAD - reinserting but not stepping.");
4450 warning ("BAD - reinserting and suspended(%d).",
4455 step
= maybe_hw_step (thread
);
4458 if (fast_tp_collecting
== fast_tpoint_collect_result::before_insn
)
4461 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4462 " (exit-jump-pad-bkpt)\n",
4465 else if (fast_tp_collecting
== fast_tpoint_collect_result::at_insn
)
4468 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4469 " single-stepping\n",
4472 if (can_hardware_single_step ())
4476 internal_error (__FILE__
, __LINE__
,
4477 "moving out of jump pad single-stepping"
4478 " not implemented on this target");
4482 /* If we have while-stepping actions in this thread set it stepping.
4483 If we have a signal to deliver, it may or may not be set to
4484 SIG_IGN, we don't know. Assume so, and allow collecting
4485 while-stepping into a signal handler. A possible smart thing to
4486 do would be to set an internal breakpoint at the signal return
4487 address, continue, and carry on catching this while-stepping
4488 action only when that breakpoint is hit. A future
4490 if (thread
->while_stepping
!= NULL
)
4493 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4496 step
= single_step (lwp
);
4499 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4501 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4503 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4507 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4508 (long) lwp
->stop_pc
);
4512 /* If we have pending signals, consume one if it can be delivered to
4514 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4516 struct pending_signals
**p_sig
;
4518 p_sig
= &lwp
->pending_signals
;
4519 while ((*p_sig
)->prev
!= NULL
)
4520 p_sig
= &(*p_sig
)->prev
;
4522 signal
= (*p_sig
)->signal
;
4523 if ((*p_sig
)->info
.si_signo
!= 0)
4524 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4532 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4533 lwpid_of (thread
), step
? "step" : "continue", signal
,
4534 lwp
->stop_expected
? "expected" : "not expected");
4536 if (the_low_target
.prepare_to_resume
!= NULL
)
4537 the_low_target
.prepare_to_resume (lwp
);
4539 regcache_invalidate_thread (thread
);
4541 lwp
->stepping
= step
;
4543 ptrace_request
= PTRACE_SINGLESTEP
;
4544 else if (gdb_catching_syscalls_p (lwp
))
4545 ptrace_request
= PTRACE_SYSCALL
;
4547 ptrace_request
= PTRACE_CONT
;
4548 ptrace (ptrace_request
,
4550 (PTRACE_TYPE_ARG3
) 0,
4551 /* Coerce to a uintptr_t first to avoid potential gcc warning
4552 of coercing an 8 byte integer to a 4 byte pointer. */
4553 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4555 current_thread
= saved_thread
;
4557 perror_with_name ("resuming thread");
4559 /* Successfully resumed. Clear state that no longer makes sense,
4560 and mark the LWP as running. Must not do this before resuming
4561 otherwise if that fails other code will be confused. E.g., we'd
4562 later try to stop the LWP and hang forever waiting for a stop
4563 status. Note that we must not throw after this is cleared,
4564 otherwise handle_zombie_lwp_error would get confused. */
4566 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4569 /* Called when we try to resume a stopped LWP and that errors out. If
4570 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4571 or about to become), discard the error, clear any pending status
4572 the LWP may have, and return true (we'll collect the exit status
4573 soon enough). Otherwise, return false. */
4576 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4578 struct thread_info
*thread
= get_lwp_thread (lp
);
4580 /* If we get an error after resuming the LWP successfully, we'd
4581 confuse !T state for the LWP being gone. */
4582 gdb_assert (lp
->stopped
);
4584 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4585 because even if ptrace failed with ESRCH, the tracee may be "not
4586 yet fully dead", but already refusing ptrace requests. In that
4587 case the tracee has 'R (Running)' state for a little bit
4588 (observed in Linux 3.18). See also the note on ESRCH in the
4589 ptrace(2) man page. Instead, check whether the LWP has any state
4590 other than ptrace-stopped. */
4592 /* Don't assume anything if /proc/PID/status can't be read. */
4593 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4595 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4596 lp
->status_pending_p
= 0;
4602 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4603 disappears while we try to resume it. */
4606 linux_resume_one_lwp (struct lwp_info
*lwp
,
4607 int step
, int signal
, siginfo_t
*info
)
4611 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4613 CATCH (ex
, RETURN_MASK_ERROR
)
4615 if (!check_ptrace_stopped_lwp_gone (lwp
))
4616 throw_exception (ex
);
4621 struct thread_resume_array
4623 struct thread_resume
*resume
;
4627 /* This function is called once per thread via find_inferior.
4628 ARG is a pointer to a thread_resume_array struct.
4629 We look up the thread specified by ENTRY in ARG, and mark the thread
4630 with a pointer to the appropriate resume request.
4632 This algorithm is O(threads * resume elements), but resume elements
4633 is small (and will remain small at least until GDB supports thread
4637 linux_set_resume_request (thread_info
*thread
, void *arg
)
4639 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4641 struct thread_resume_array
*r
;
4643 r
= (struct thread_resume_array
*) arg
;
4645 for (ndx
= 0; ndx
< r
->n
; ndx
++)
4647 ptid_t ptid
= r
->resume
[ndx
].thread
;
4648 if (ptid_equal (ptid
, minus_one_ptid
)
4649 || ptid
== thread
->id
4650 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4652 || (ptid_get_pid (ptid
) == pid_of (thread
)
4653 && (ptid_is_pid (ptid
)
4654 || ptid_get_lwp (ptid
) == -1)))
4656 if (r
->resume
[ndx
].kind
== resume_stop
4657 && thread
->last_resume_kind
== resume_stop
)
4660 debug_printf ("already %s LWP %ld at GDB's request\n",
4661 (thread
->last_status
.kind
4662 == TARGET_WAITKIND_STOPPED
)
4670 /* Ignore (wildcard) resume requests for already-resumed
4672 if (r
->resume
[ndx
].kind
!= resume_stop
4673 && thread
->last_resume_kind
!= resume_stop
)
4676 debug_printf ("already %s LWP %ld at GDB's request\n",
4677 (thread
->last_resume_kind
4685 /* Don't let wildcard resumes resume fork children that GDB
4686 does not yet know are new fork children. */
4687 if (lwp
->fork_relative
!= NULL
)
4689 struct lwp_info
*rel
= lwp
->fork_relative
;
4691 if (rel
->status_pending_p
4692 && (rel
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
4693 || rel
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
))
4696 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4702 /* If the thread has a pending event that has already been
4703 reported to GDBserver core, but GDB has not pulled the
4704 event out of the vStopped queue yet, likewise, ignore the
4705 (wildcard) resume request. */
4706 if (in_queued_stop_replies (thread
->id
))
4709 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4714 lwp
->resume
= &r
->resume
[ndx
];
4715 thread
->last_resume_kind
= lwp
->resume
->kind
;
4717 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4718 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4720 /* If we had a deferred signal to report, dequeue one now.
4721 This can happen if LWP gets more than one signal while
4722 trying to get out of a jump pad. */
4724 && !lwp
->status_pending_p
4725 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4727 lwp
->status_pending_p
= 1;
4730 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4731 "leaving status pending.\n",
4732 WSTOPSIG (lwp
->status_pending
),
4740 /* No resume action for this thread. */
4746 /* find_inferior callback for linux_resume.
4747 Set *FLAG_P if this lwp has an interesting status pending. */
4750 resume_status_pending_p (thread_info
*thread
, void *flag_p
)
4752 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4754 /* LWPs which will not be resumed are not interesting, because
4755 we might not wait for them next time through linux_wait. */
4756 if (lwp
->resume
== NULL
)
4759 if (thread_still_has_status_pending_p (thread
))
4760 * (int *) flag_p
= 1;
4765 /* Return 1 if this lwp that GDB wants running is stopped at an
4766 internal breakpoint that we need to step over. It assumes that any
4767 required STOP_PC adjustment has already been propagated to the
4768 inferior's regcache. */
4771 need_step_over_p (thread_info
*thread
, void *dummy
)
4773 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4774 struct thread_info
*saved_thread
;
4776 struct process_info
*proc
= get_thread_process (thread
);
4778 /* GDBserver is skipping the extra traps from the wrapper program,
4779 don't have to do step over. */
4780 if (proc
->tdesc
== NULL
)
4783 /* LWPs which will not be resumed are not interesting, because we
4784 might not wait for them next time through linux_wait. */
4789 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4794 if (thread
->last_resume_kind
== resume_stop
)
4797 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4803 gdb_assert (lwp
->suspended
>= 0);
4808 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4813 if (lwp
->status_pending_p
)
4816 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4822 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4826 /* If the PC has changed since we stopped, then don't do anything,
4827 and let the breakpoint/tracepoint be hit. This happens if, for
4828 instance, GDB handled the decr_pc_after_break subtraction itself,
4829 GDB is OOL stepping this thread, or the user has issued a "jump"
4830 command, or poked thread's registers herself. */
4831 if (pc
!= lwp
->stop_pc
)
4834 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4835 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4837 paddress (lwp
->stop_pc
), paddress (pc
));
4841 /* On software single step target, resume the inferior with signal
4842 rather than stepping over. */
4843 if (can_software_single_step ()
4844 && lwp
->pending_signals
!= NULL
4845 && lwp_signal_can_be_delivered (lwp
))
4848 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4855 saved_thread
= current_thread
;
4856 current_thread
= thread
;
4858 /* We can only step over breakpoints we know about. */
4859 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4861 /* Don't step over a breakpoint that GDB expects to hit
4862 though. If the condition is being evaluated on the target's side
4863 and it evaluate to false, step over this breakpoint as well. */
4864 if (gdb_breakpoint_here (pc
)
4865 && gdb_condition_true_at_breakpoint (pc
)
4866 && gdb_no_commands_at_breakpoint (pc
))
4869 debug_printf ("Need step over [LWP %ld]? yes, but found"
4870 " GDB breakpoint at 0x%s; skipping step over\n",
4871 lwpid_of (thread
), paddress (pc
));
4873 current_thread
= saved_thread
;
4879 debug_printf ("Need step over [LWP %ld]? yes, "
4880 "found breakpoint at 0x%s\n",
4881 lwpid_of (thread
), paddress (pc
));
4883 /* We've found an lwp that needs stepping over --- return 1 so
4884 that find_inferior stops looking. */
4885 current_thread
= saved_thread
;
4891 current_thread
= saved_thread
;
4894 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4896 lwpid_of (thread
), paddress (pc
));
4901 /* Start a step-over operation on LWP. When LWP stopped at a
4902 breakpoint, to make progress, we need to remove the breakpoint out
4903 of the way. If we let other threads run while we do that, they may
4904 pass by the breakpoint location and miss hitting it. To avoid
4905 that, a step-over momentarily stops all threads while LWP is
4906 single-stepped by either hardware or software while the breakpoint
4907 is temporarily uninserted from the inferior. When the single-step
4908 finishes, we reinsert the breakpoint, and let all threads that are
4909 supposed to be running, run again. */
4912 start_step_over (struct lwp_info
*lwp
)
4914 struct thread_info
*thread
= get_lwp_thread (lwp
);
4915 struct thread_info
*saved_thread
;
4920 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4923 stop_all_lwps (1, lwp
);
4925 if (lwp
->suspended
!= 0)
4927 internal_error (__FILE__
, __LINE__
,
4928 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4933 debug_printf ("Done stopping all threads for step-over.\n");
4935 /* Note, we should always reach here with an already adjusted PC,
4936 either by GDB (if we're resuming due to GDB's request), or by our
4937 caller, if we just finished handling an internal breakpoint GDB
4938 shouldn't care about. */
4941 saved_thread
= current_thread
;
4942 current_thread
= thread
;
4944 lwp
->bp_reinsert
= pc
;
4945 uninsert_breakpoints_at (pc
);
4946 uninsert_fast_tracepoint_jumps_at (pc
);
4948 step
= single_step (lwp
);
4950 current_thread
= saved_thread
;
4952 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4954 /* Require next event from this LWP. */
4955 step_over_bkpt
= thread
->id
;
4959 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4960 start_step_over, if still there, and delete any single-step
4961 breakpoints we've set, on non hardware single-step targets. */
4964 finish_step_over (struct lwp_info
*lwp
)
4966 if (lwp
->bp_reinsert
!= 0)
4968 struct thread_info
*saved_thread
= current_thread
;
4971 debug_printf ("Finished step over.\n");
4973 current_thread
= get_lwp_thread (lwp
);
4975 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4976 may be no breakpoint to reinsert there by now. */
4977 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4978 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4980 lwp
->bp_reinsert
= 0;
4982 /* Delete any single-step breakpoints. No longer needed. We
4983 don't have to worry about other threads hitting this trap,
4984 and later not being able to explain it, because we were
4985 stepping over a breakpoint, and we hold all threads but
4986 LWP stopped while doing that. */
4987 if (!can_hardware_single_step ())
4989 gdb_assert (has_single_step_breakpoints (current_thread
));
4990 delete_single_step_breakpoints (current_thread
);
4993 step_over_bkpt
= null_ptid
;
4994 current_thread
= saved_thread
;
5001 /* If there's a step over in progress, wait until all threads stop
5002 (that is, until the stepping thread finishes its step), and
5003 unsuspend all lwps. The stepping thread ends with its status
5004 pending, which is processed later when we get back to processing
5008 complete_ongoing_step_over (void)
5010 if (!ptid_equal (step_over_bkpt
, null_ptid
))
5012 struct lwp_info
*lwp
;
5017 debug_printf ("detach: step over in progress, finish it first\n");
5019 /* Passing NULL_PTID as filter indicates we want all events to
5020 be left pending. Eventually this returns when there are no
5021 unwaited-for children left. */
5022 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
5024 gdb_assert (ret
== -1);
5026 lwp
= find_lwp_pid (step_over_bkpt
);
5028 finish_step_over (lwp
);
5029 step_over_bkpt
= null_ptid
;
5030 unsuspend_all_lwps (lwp
);
5034 /* This function is called once per thread. We check the thread's resume
5035 request, which will tell us whether to resume, step, or leave the thread
5036 stopped; and what signal, if any, it should be sent.
5038 For threads which we aren't explicitly told otherwise, we preserve
5039 the stepping flag; this is used for stepping over gdbserver-placed
5042 If pending_flags was set in any thread, we queue any needed
5043 signals, since we won't actually resume. We already have a pending
5044 event to report, so we don't need to preserve any step requests;
5045 they should be re-issued if necessary. */
5048 linux_resume_one_thread (thread_info
*thread
, void *arg
)
5050 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5051 int leave_all_stopped
= * (int *) arg
;
5054 if (lwp
->resume
== NULL
)
5057 if (lwp
->resume
->kind
== resume_stop
)
5060 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
5065 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
5067 /* Stop the thread, and wait for the event asynchronously,
5068 through the event loop. */
5074 debug_printf ("already stopped LWP %ld\n",
5077 /* The LWP may have been stopped in an internal event that
5078 was not meant to be notified back to GDB (e.g., gdbserver
5079 breakpoint), so we should be reporting a stop event in
5082 /* If the thread already has a pending SIGSTOP, this is a
5083 no-op. Otherwise, something later will presumably resume
5084 the thread and this will cause it to cancel any pending
5085 operation, due to last_resume_kind == resume_stop. If
5086 the thread already has a pending status to report, we
5087 will still report it the next time we wait - see
5088 status_pending_p_callback. */
5090 /* If we already have a pending signal to report, then
5091 there's no need to queue a SIGSTOP, as this means we're
5092 midway through moving the LWP out of the jumppad, and we
5093 will report the pending signal as soon as that is
5095 if (lwp
->pending_signals_to_report
== NULL
)
5099 /* For stop requests, we're done. */
5101 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5105 /* If this thread which is about to be resumed has a pending status,
5106 then don't resume it - we can just report the pending status.
5107 Likewise if it is suspended, because e.g., another thread is
5108 stepping past a breakpoint. Make sure to queue any signals that
5109 would otherwise be sent. In all-stop mode, we do this decision
5110 based on if *any* thread has a pending status. If there's a
5111 thread that needs the step-over-breakpoint dance, then don't
5112 resume any other thread but that particular one. */
5113 leave_pending
= (lwp
->suspended
5114 || lwp
->status_pending_p
5115 || leave_all_stopped
);
5117 /* If we have a new signal, enqueue the signal. */
5118 if (lwp
->resume
->sig
!= 0)
5120 siginfo_t info
, *info_p
;
5122 /* If this is the same signal we were previously stopped by,
5123 make sure to queue its siginfo. */
5124 if (WIFSTOPPED (lwp
->last_status
)
5125 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
5126 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
5127 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
5132 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
5138 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
5140 proceed_one_lwp (thread
, NULL
);
5145 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5148 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5154 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5156 struct thread_resume_array array
= { resume_info
, n
};
5157 struct thread_info
*need_step_over
= NULL
;
5159 int leave_all_stopped
;
5164 debug_printf ("linux_resume:\n");
5167 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
5169 /* If there is a thread which would otherwise be resumed, which has
5170 a pending status, then don't resume any threads - we can just
5171 report the pending status. Make sure to queue any signals that
5172 would otherwise be sent. In non-stop mode, we'll apply this
5173 logic to each thread individually. We consume all pending events
5174 before considering to start a step-over (in all-stop). */
5177 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
5179 /* If there is a thread which would otherwise be resumed, which is
5180 stopped at a breakpoint that needs stepping over, then don't
5181 resume any threads - have it step over the breakpoint with all
5182 other threads stopped, then resume all threads again. Make sure
5183 to queue any signals that would otherwise be delivered or
5185 if (!any_pending
&& supports_breakpoints ())
5187 = (struct thread_info
*) find_inferior (&all_threads
,
5188 need_step_over_p
, NULL
);
5190 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5194 if (need_step_over
!= NULL
)
5195 debug_printf ("Not resuming all, need step over\n");
5196 else if (any_pending
)
5197 debug_printf ("Not resuming, all-stop and found "
5198 "an LWP with pending status\n");
5200 debug_printf ("Resuming, no pending status or step over needed\n");
5203 /* Even if we're leaving threads stopped, queue all signals we'd
5204 otherwise deliver. */
5205 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
5208 start_step_over (get_thread_lwp (need_step_over
));
5212 debug_printf ("linux_resume done\n");
5216 /* We may have events that were pending that can/should be sent to
5217 the client now. Trigger a linux_wait call. */
5218 if (target_is_async_p ())
5222 /* This function is called once per thread. We check the thread's
5223 last resume request, which will tell us whether to resume, step, or
5224 leave the thread stopped. Any signal the client requested to be
5225 delivered has already been enqueued at this point.
5227 If any thread that GDB wants running is stopped at an internal
5228 breakpoint that needs stepping over, we start a step-over operation
5229 on that particular thread, and leave all others stopped. */
5232 proceed_one_lwp (thread_info
*thread
, void *except
)
5234 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5241 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5246 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5250 if (thread
->last_resume_kind
== resume_stop
5251 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5254 debug_printf (" client wants LWP to remain %ld stopped\n",
5259 if (lwp
->status_pending_p
)
5262 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5267 gdb_assert (lwp
->suspended
>= 0);
5272 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5276 if (thread
->last_resume_kind
== resume_stop
5277 && lwp
->pending_signals_to_report
== NULL
5278 && (lwp
->collecting_fast_tracepoint
5279 == fast_tpoint_collect_result::not_collecting
))
5281 /* We haven't reported this LWP as stopped yet (otherwise, the
5282 last_status.kind check above would catch it, and we wouldn't
5283 reach here. This LWP may have been momentarily paused by a
5284 stop_all_lwps call while handling for example, another LWP's
5285 step-over. In that case, the pending expected SIGSTOP signal
5286 that was queued at vCont;t handling time will have already
5287 been consumed by wait_for_sigstop, and so we need to requeue
5288 another one here. Note that if the LWP already has a SIGSTOP
5289 pending, this is a no-op. */
5292 debug_printf ("Client wants LWP %ld to stop. "
5293 "Making sure it has a SIGSTOP pending\n",
5299 if (thread
->last_resume_kind
== resume_step
)
5302 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5305 /* If resume_step is requested by GDB, install single-step
5306 breakpoints when the thread is about to be actually resumed if
5307 the single-step breakpoints weren't removed. */
5308 if (can_software_single_step ()
5309 && !has_single_step_breakpoints (thread
))
5310 install_software_single_step_breakpoints (lwp
);
5312 step
= maybe_hw_step (thread
);
5314 else if (lwp
->bp_reinsert
!= 0)
5317 debug_printf (" stepping LWP %ld, reinsert set\n",
5320 step
= maybe_hw_step (thread
);
5325 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5330 unsuspend_and_proceed_one_lwp (thread_info
*thread
, void *except
)
5332 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5337 lwp_suspended_decr (lwp
);
5339 return proceed_one_lwp (thread
, except
);
5342 /* When we finish a step-over, set threads running again. If there's
5343 another thread that may need a step-over, now's the time to start
5344 it. Eventually, we'll move all threads past their breakpoints. */
5347 proceed_all_lwps (void)
5349 struct thread_info
*need_step_over
;
5351 /* If there is a thread which would otherwise be resumed, which is
5352 stopped at a breakpoint that needs stepping over, then don't
5353 resume any threads - have it step over the breakpoint with all
5354 other threads stopped, then resume all threads again. */
5356 if (supports_breakpoints ())
5359 = (struct thread_info
*) find_inferior (&all_threads
,
5360 need_step_over_p
, NULL
);
5362 if (need_step_over
!= NULL
)
5365 debug_printf ("proceed_all_lwps: found "
5366 "thread %ld needing a step-over\n",
5367 lwpid_of (need_step_over
));
5369 start_step_over (get_thread_lwp (need_step_over
));
5375 debug_printf ("Proceeding, no step-over needed\n");
5377 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
5380 /* Stopped LWPs that the client wanted to be running, that don't have
5381 pending statuses, are set to run again, except for EXCEPT, if not
5382 NULL. This undoes a stop_all_lwps call. */
5385 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5391 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5392 lwpid_of (get_lwp_thread (except
)));
5394 debug_printf ("unstopping all lwps\n");
5398 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
5400 find_inferior (&all_threads
, proceed_one_lwp
, except
);
5404 debug_printf ("unstop_all_lwps done\n");
5410 #ifdef HAVE_LINUX_REGSETS
5412 #define use_linux_regsets 1
5414 /* Returns true if REGSET has been disabled. */
5417 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5419 return (info
->disabled_regsets
!= NULL
5420 && info
->disabled_regsets
[regset
- info
->regsets
]);
5423 /* Disable REGSET. */
5426 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5430 dr_offset
= regset
- info
->regsets
;
5431 if (info
->disabled_regsets
== NULL
)
5432 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5433 info
->disabled_regsets
[dr_offset
] = 1;
5437 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5438 struct regcache
*regcache
)
5440 struct regset_info
*regset
;
5441 int saw_general_regs
= 0;
5445 pid
= lwpid_of (current_thread
);
5446 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5451 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5454 buf
= xmalloc (regset
->size
);
5456 nt_type
= regset
->nt_type
;
5460 iov
.iov_len
= regset
->size
;
5461 data
= (void *) &iov
;
5467 res
= ptrace (regset
->get_request
, pid
,
5468 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5470 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5476 /* If we get EIO on a regset, do not try it again for
5477 this process mode. */
5478 disable_regset (regsets_info
, regset
);
5480 else if (errno
== ENODATA
)
5482 /* ENODATA may be returned if the regset is currently
5483 not "active". This can happen in normal operation,
5484 so suppress the warning in this case. */
5486 else if (errno
== ESRCH
)
5488 /* At this point, ESRCH should mean the process is
5489 already gone, in which case we simply ignore attempts
5490 to read its registers. */
5495 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5502 if (regset
->type
== GENERAL_REGS
)
5503 saw_general_regs
= 1;
5504 regset
->store_function (regcache
, buf
);
5508 if (saw_general_regs
)
5515 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5516 struct regcache
*regcache
)
5518 struct regset_info
*regset
;
5519 int saw_general_regs
= 0;
5523 pid
= lwpid_of (current_thread
);
5524 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5529 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5530 || regset
->fill_function
== NULL
)
5533 buf
= xmalloc (regset
->size
);
5535 /* First fill the buffer with the current register set contents,
5536 in case there are any items in the kernel's regset that are
5537 not in gdbserver's regcache. */
5539 nt_type
= regset
->nt_type
;
5543 iov
.iov_len
= regset
->size
;
5544 data
= (void *) &iov
;
5550 res
= ptrace (regset
->get_request
, pid
,
5551 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5553 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5558 /* Then overlay our cached registers on that. */
5559 regset
->fill_function (regcache
, buf
);
5561 /* Only now do we write the register set. */
5563 res
= ptrace (regset
->set_request
, pid
,
5564 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5566 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5574 /* If we get EIO on a regset, do not try it again for
5575 this process mode. */
5576 disable_regset (regsets_info
, regset
);
5578 else if (errno
== ESRCH
)
5580 /* At this point, ESRCH should mean the process is
5581 already gone, in which case we simply ignore attempts
5582 to change its registers. See also the related
5583 comment in linux_resume_one_lwp. */
5589 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5592 else if (regset
->type
== GENERAL_REGS
)
5593 saw_general_regs
= 1;
5596 if (saw_general_regs
)
5602 #else /* !HAVE_LINUX_REGSETS */
5604 #define use_linux_regsets 0
5605 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5606 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5610 /* Return 1 if register REGNO is supported by one of the regset ptrace
5611 calls or 0 if it has to be transferred individually. */
5614 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5616 unsigned char mask
= 1 << (regno
% 8);
5617 size_t index
= regno
/ 8;
5619 return (use_linux_regsets
5620 && (regs_info
->regset_bitmap
== NULL
5621 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5624 #ifdef HAVE_LINUX_USRREGS
5627 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5631 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5632 error ("Invalid register number %d.", regnum
);
5634 addr
= usrregs
->regmap
[regnum
];
5639 /* Fetch one register. */
5641 fetch_register (const struct usrregs_info
*usrregs
,
5642 struct regcache
*regcache
, int regno
)
5649 if (regno
>= usrregs
->num_regs
)
5651 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5654 regaddr
= register_addr (usrregs
, regno
);
5658 size
= ((register_size (regcache
->tdesc
, regno
)
5659 + sizeof (PTRACE_XFER_TYPE
) - 1)
5660 & -sizeof (PTRACE_XFER_TYPE
));
5661 buf
= (char *) alloca (size
);
5663 pid
= lwpid_of (current_thread
);
5664 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5667 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5668 ptrace (PTRACE_PEEKUSER
, pid
,
5669 /* Coerce to a uintptr_t first to avoid potential gcc warning
5670 of coercing an 8 byte integer to a 4 byte pointer. */
5671 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5672 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5674 error ("reading register %d: %s", regno
, strerror (errno
));
5677 if (the_low_target
.supply_ptrace_register
)
5678 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5680 supply_register (regcache
, regno
, buf
);
5683 /* Store one register. */
5685 store_register (const struct usrregs_info
*usrregs
,
5686 struct regcache
*regcache
, int regno
)
5693 if (regno
>= usrregs
->num_regs
)
5695 if ((*the_low_target
.cannot_store_register
) (regno
))
5698 regaddr
= register_addr (usrregs
, regno
);
5702 size
= ((register_size (regcache
->tdesc
, regno
)
5703 + sizeof (PTRACE_XFER_TYPE
) - 1)
5704 & -sizeof (PTRACE_XFER_TYPE
));
5705 buf
= (char *) alloca (size
);
5706 memset (buf
, 0, size
);
5708 if (the_low_target
.collect_ptrace_register
)
5709 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5711 collect_register (regcache
, regno
, buf
);
5713 pid
= lwpid_of (current_thread
);
5714 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5717 ptrace (PTRACE_POKEUSER
, pid
,
5718 /* Coerce to a uintptr_t first to avoid potential gcc warning
5719 about coercing an 8 byte integer to a 4 byte pointer. */
5720 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5721 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5724 /* At this point, ESRCH should mean the process is
5725 already gone, in which case we simply ignore attempts
5726 to change its registers. See also the related
5727 comment in linux_resume_one_lwp. */
5731 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5732 error ("writing register %d: %s", regno
, strerror (errno
));
5734 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5738 /* Fetch all registers, or just one, from the child process.
5739 If REGNO is -1, do this for all registers, skipping any that are
5740 assumed to have been retrieved by regsets_fetch_inferior_registers,
5741 unless ALL is non-zero.
5742 Otherwise, REGNO specifies which register (so we can save time). */
5744 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5745 struct regcache
*regcache
, int regno
, int all
)
5747 struct usrregs_info
*usr
= regs_info
->usrregs
;
5751 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5752 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5753 fetch_register (usr
, regcache
, regno
);
5756 fetch_register (usr
, regcache
, regno
);
5759 /* Store our register values back into the inferior.
5760 If REGNO is -1, do this for all registers, skipping any that are
5761 assumed to have been saved by regsets_store_inferior_registers,
5762 unless ALL is non-zero.
5763 Otherwise, REGNO specifies which register (so we can save time). */
5765 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5766 struct regcache
*regcache
, int regno
, int all
)
5768 struct usrregs_info
*usr
= regs_info
->usrregs
;
5772 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5773 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5774 store_register (usr
, regcache
, regno
);
5777 store_register (usr
, regcache
, regno
);
5780 #else /* !HAVE_LINUX_USRREGS */
5782 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5783 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5789 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5793 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5797 if (the_low_target
.fetch_register
!= NULL
5798 && regs_info
->usrregs
!= NULL
)
5799 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5800 (*the_low_target
.fetch_register
) (regcache
, regno
);
5802 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5803 if (regs_info
->usrregs
!= NULL
)
5804 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5808 if (the_low_target
.fetch_register
!= NULL
5809 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5812 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5814 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5816 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5817 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5822 linux_store_registers (struct regcache
*regcache
, int regno
)
5826 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5830 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5832 if (regs_info
->usrregs
!= NULL
)
5833 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5837 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5839 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5841 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5842 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5847 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5848 to debugger memory starting at MYADDR. */
5851 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5853 int pid
= lwpid_of (current_thread
);
5854 PTRACE_XFER_TYPE
*buffer
;
5862 /* Try using /proc. Don't bother for one word. */
5863 if (len
>= 3 * sizeof (long))
5867 /* We could keep this file open and cache it - possibly one per
5868 thread. That requires some juggling, but is even faster. */
5869 sprintf (filename
, "/proc/%d/mem", pid
);
5870 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5874 /* If pread64 is available, use it. It's faster if the kernel
5875 supports it (only one syscall), and it's 64-bit safe even on
5876 32-bit platforms (for instance, SPARC debugging a SPARC64
5879 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5882 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5883 bytes
= read (fd
, myaddr
, len
);
5890 /* Some data was read, we'll try to get the rest with ptrace. */
5900 /* Round starting address down to longword boundary. */
5901 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5902 /* Round ending address up; get number of longwords that makes. */
5903 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5904 / sizeof (PTRACE_XFER_TYPE
));
5905 /* Allocate buffer of that many longwords. */
5906 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5908 /* Read all the longwords */
5910 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5912 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5913 about coercing an 8 byte integer to a 4 byte pointer. */
5914 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5915 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5916 (PTRACE_TYPE_ARG4
) 0);
5922 /* Copy appropriate bytes out of the buffer. */
5925 i
*= sizeof (PTRACE_XFER_TYPE
);
5926 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5928 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5935 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5936 memory at MEMADDR. On failure (cannot write to the inferior)
5937 returns the value of errno. Always succeeds if LEN is zero. */
5940 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5943 /* Round starting address down to longword boundary. */
5944 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5945 /* Round ending address up; get number of longwords that makes. */
5947 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5948 / sizeof (PTRACE_XFER_TYPE
);
5950 /* Allocate buffer of that many longwords. */
5951 PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5953 int pid
= lwpid_of (current_thread
);
5957 /* Zero length write always succeeds. */
5963 /* Dump up to four bytes. */
5964 char str
[4 * 2 + 1];
5966 int dump
= len
< 4 ? len
: 4;
5968 for (i
= 0; i
< dump
; i
++)
5970 sprintf (p
, "%02x", myaddr
[i
]);
5975 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5976 str
, (long) memaddr
, pid
);
5979 /* Fill start and end extra bytes of buffer with existing memory data. */
5982 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5983 about coercing an 8 byte integer to a 4 byte pointer. */
5984 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5985 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5986 (PTRACE_TYPE_ARG4
) 0);
5994 = ptrace (PTRACE_PEEKTEXT
, pid
,
5995 /* Coerce to a uintptr_t first to avoid potential gcc warning
5996 about coercing an 8 byte integer to a 4 byte pointer. */
5997 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5998 * sizeof (PTRACE_XFER_TYPE
)),
5999 (PTRACE_TYPE_ARG4
) 0);
6004 /* Copy data to be written over corresponding part of buffer. */
6006 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
6009 /* Write the entire buffer. */
6011 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
6014 ptrace (PTRACE_POKETEXT
, pid
,
6015 /* Coerce to a uintptr_t first to avoid potential gcc warning
6016 about coercing an 8 byte integer to a 4 byte pointer. */
6017 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
6018 (PTRACE_TYPE_ARG4
) buffer
[i
]);
6027 linux_look_up_symbols (void)
6029 #ifdef USE_THREAD_DB
6030 struct process_info
*proc
= current_process ();
6032 if (proc
->priv
->thread_db
!= NULL
)
6040 linux_request_interrupt (void)
6042 /* Send a SIGINT to the process group. This acts just like the user
6043 typed a ^C on the controlling terminal. */
6044 kill (-signal_pid
, SIGINT
);
6047 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
6048 to debugger memory starting at MYADDR. */
6051 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
6053 char filename
[PATH_MAX
];
6055 int pid
= lwpid_of (current_thread
);
6057 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6059 fd
= open (filename
, O_RDONLY
);
6063 if (offset
!= (CORE_ADDR
) 0
6064 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6067 n
= read (fd
, myaddr
, len
);
6074 /* These breakpoint and watchpoint related wrapper functions simply
6075 pass on the function call if the target has registered a
6076 corresponding function. */
6079 linux_supports_z_point_type (char z_type
)
6081 return (the_low_target
.supports_z_point_type
!= NULL
6082 && the_low_target
.supports_z_point_type (z_type
));
6086 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6087 int size
, struct raw_breakpoint
*bp
)
6089 if (type
== raw_bkpt_type_sw
)
6090 return insert_memory_breakpoint (bp
);
6091 else if (the_low_target
.insert_point
!= NULL
)
6092 return the_low_target
.insert_point (type
, addr
, size
, bp
);
6094 /* Unsupported (see target.h). */
6099 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6100 int size
, struct raw_breakpoint
*bp
)
6102 if (type
== raw_bkpt_type_sw
)
6103 return remove_memory_breakpoint (bp
);
6104 else if (the_low_target
.remove_point
!= NULL
)
6105 return the_low_target
.remove_point (type
, addr
, size
, bp
);
6107 /* Unsupported (see target.h). */
6111 /* Implement the to_stopped_by_sw_breakpoint target_ops
6115 linux_stopped_by_sw_breakpoint (void)
6117 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6119 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
6122 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
6126 linux_supports_stopped_by_sw_breakpoint (void)
6128 return USE_SIGTRAP_SIGINFO
;
6131 /* Implement the to_stopped_by_hw_breakpoint target_ops
6135 linux_stopped_by_hw_breakpoint (void)
6137 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6139 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6142 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6146 linux_supports_stopped_by_hw_breakpoint (void)
6148 return USE_SIGTRAP_SIGINFO
;
6151 /* Implement the supports_hardware_single_step target_ops method. */
6154 linux_supports_hardware_single_step (void)
6156 return can_hardware_single_step ();
6160 linux_supports_software_single_step (void)
6162 return can_software_single_step ();
6166 linux_stopped_by_watchpoint (void)
6168 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6170 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6174 linux_stopped_data_address (void)
6176 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6178 return lwp
->stopped_data_address
;
6181 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6182 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6183 && defined(PT_TEXT_END_ADDR)
6185 /* This is only used for targets that define PT_TEXT_ADDR,
6186 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6187 the target has different ways of acquiring this information, like
6190 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6191 to tell gdb about. */
6194 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6196 unsigned long text
, text_end
, data
;
6197 int pid
= lwpid_of (current_thread
);
6201 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6202 (PTRACE_TYPE_ARG4
) 0);
6203 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6204 (PTRACE_TYPE_ARG4
) 0);
6205 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6206 (PTRACE_TYPE_ARG4
) 0);
6210 /* Both text and data offsets produced at compile-time (and so
6211 used by gdb) are relative to the beginning of the program,
6212 with the data segment immediately following the text segment.
6213 However, the actual runtime layout in memory may put the data
6214 somewhere else, so when we send gdb a data base-address, we
6215 use the real data base address and subtract the compile-time
6216 data base-address from it (which is just the length of the
6217 text segment). BSS immediately follows data in both
6220 *data_p
= data
- (text_end
- text
);
6229 linux_qxfer_osdata (const char *annex
,
6230 unsigned char *readbuf
, unsigned const char *writebuf
,
6231 CORE_ADDR offset
, int len
)
6233 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6236 /* Convert a native/host siginfo object, into/from the siginfo in the
6237 layout of the inferiors' architecture. */
6240 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6244 if (the_low_target
.siginfo_fixup
!= NULL
)
6245 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6247 /* If there was no callback, or the callback didn't do anything,
6248 then just do a straight memcpy. */
6252 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6254 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6259 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6260 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6264 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6266 if (current_thread
== NULL
)
6269 pid
= lwpid_of (current_thread
);
6272 debug_printf ("%s siginfo for lwp %d.\n",
6273 readbuf
!= NULL
? "Reading" : "Writing",
6276 if (offset
>= sizeof (siginfo
))
6279 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6282 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6283 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6284 inferior with a 64-bit GDBSERVER should look the same as debugging it
6285 with a 32-bit GDBSERVER, we need to convert it. */
6286 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6288 if (offset
+ len
> sizeof (siginfo
))
6289 len
= sizeof (siginfo
) - offset
;
6291 if (readbuf
!= NULL
)
6292 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6295 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6297 /* Convert back to ptrace layout before flushing it out. */
6298 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6300 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6307 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6308 so we notice when children change state; as the handler for the
6309 sigsuspend in my_waitpid. */
6312 sigchld_handler (int signo
)
6314 int old_errno
= errno
;
6320 /* fprintf is not async-signal-safe, so call write
6322 if (write (2, "sigchld_handler\n",
6323 sizeof ("sigchld_handler\n") - 1) < 0)
6324 break; /* just ignore */
6328 if (target_is_async_p ())
6329 async_file_mark (); /* trigger a linux_wait */
6335 linux_supports_non_stop (void)
6341 linux_async (int enable
)
6343 int previous
= target_is_async_p ();
6346 debug_printf ("linux_async (%d), previous=%d\n",
6349 if (previous
!= enable
)
6352 sigemptyset (&mask
);
6353 sigaddset (&mask
, SIGCHLD
);
6355 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6359 if (pipe (linux_event_pipe
) == -1)
6361 linux_event_pipe
[0] = -1;
6362 linux_event_pipe
[1] = -1;
6363 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6365 warning ("creating event pipe failed.");
6369 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6370 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6372 /* Register the event loop handler. */
6373 add_file_handler (linux_event_pipe
[0],
6374 handle_target_event
, NULL
);
6376 /* Always trigger a linux_wait. */
6381 delete_file_handler (linux_event_pipe
[0]);
6383 close (linux_event_pipe
[0]);
6384 close (linux_event_pipe
[1]);
6385 linux_event_pipe
[0] = -1;
6386 linux_event_pipe
[1] = -1;
6389 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6396 linux_start_non_stop (int nonstop
)
6398 /* Register or unregister from event-loop accordingly. */
6399 linux_async (nonstop
);
6401 if (target_is_async_p () != (nonstop
!= 0))
6408 linux_supports_multi_process (void)
6413 /* Check if fork events are supported. */
6416 linux_supports_fork_events (void)
6418 return linux_supports_tracefork ();
6421 /* Check if vfork events are supported. */
6424 linux_supports_vfork_events (void)
6426 return linux_supports_tracefork ();
6429 /* Check if exec events are supported. */
6432 linux_supports_exec_events (void)
6434 return linux_supports_traceexec ();
6437 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6438 ptrace flags for all inferiors. This is in case the new GDB connection
6439 doesn't support the same set of events that the previous one did. */
6442 linux_handle_new_gdb_connection (void)
6444 /* Request that all the lwps reset their ptrace options. */
6445 for_each_thread ([] (thread_info
*thread
)
6447 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6451 /* Stop the lwp so we can modify its ptrace options. */
6452 lwp
->must_set_ptrace_flags
= 1;
6453 linux_stop_lwp (lwp
);
6457 /* Already stopped; go ahead and set the ptrace options. */
6458 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6459 int options
= linux_low_ptrace_options (proc
->attached
);
6461 linux_enable_event_reporting (lwpid_of (thread
), options
);
6462 lwp
->must_set_ptrace_flags
= 0;
6468 linux_supports_disable_randomization (void)
6470 #ifdef HAVE_PERSONALITY
6478 linux_supports_agent (void)
6484 linux_supports_range_stepping (void)
6486 if (can_software_single_step ())
6488 if (*the_low_target
.supports_range_stepping
== NULL
)
6491 return (*the_low_target
.supports_range_stepping
) ();
6494 /* Enumerate spufs IDs for process PID. */
6496 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6502 struct dirent
*entry
;
6504 sprintf (path
, "/proc/%ld/fd", pid
);
6505 dir
= opendir (path
);
6510 while ((entry
= readdir (dir
)) != NULL
)
6516 fd
= atoi (entry
->d_name
);
6520 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6521 if (stat (path
, &st
) != 0)
6523 if (!S_ISDIR (st
.st_mode
))
6526 if (statfs (path
, &stfs
) != 0)
6528 if (stfs
.f_type
!= SPUFS_MAGIC
)
6531 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6533 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6543 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6544 object type, using the /proc file system. */
6546 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6547 unsigned const char *writebuf
,
6548 CORE_ADDR offset
, int len
)
6550 long pid
= lwpid_of (current_thread
);
6555 if (!writebuf
&& !readbuf
)
6563 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6566 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6567 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6572 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6579 ret
= write (fd
, writebuf
, (size_t) len
);
6581 ret
= read (fd
, readbuf
, (size_t) len
);
6587 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6588 struct target_loadseg
6590 /* Core address to which the segment is mapped. */
6592 /* VMA recorded in the program header. */
6594 /* Size of this segment in memory. */
6598 # if defined PT_GETDSBT
6599 struct target_loadmap
6601 /* Protocol version number, must be zero. */
6603 /* Pointer to the DSBT table, its size, and the DSBT index. */
6604 unsigned *dsbt_table
;
6605 unsigned dsbt_size
, dsbt_index
;
6606 /* Number of segments in this map. */
6608 /* The actual memory map. */
6609 struct target_loadseg segs
[/*nsegs*/];
6611 # define LINUX_LOADMAP PT_GETDSBT
6612 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6613 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6615 struct target_loadmap
6617 /* Protocol version number, must be zero. */
6619 /* Number of segments in this map. */
6621 /* The actual memory map. */
6622 struct target_loadseg segs
[/*nsegs*/];
6624 # define LINUX_LOADMAP PTRACE_GETFDPIC
6625 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6626 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6630 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6631 unsigned char *myaddr
, unsigned int len
)
6633 int pid
= lwpid_of (current_thread
);
6635 struct target_loadmap
*data
= NULL
;
6636 unsigned int actual_length
, copy_length
;
6638 if (strcmp (annex
, "exec") == 0)
6639 addr
= (int) LINUX_LOADMAP_EXEC
;
6640 else if (strcmp (annex
, "interp") == 0)
6641 addr
= (int) LINUX_LOADMAP_INTERP
;
6645 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6651 actual_length
= sizeof (struct target_loadmap
)
6652 + sizeof (struct target_loadseg
) * data
->nsegs
;
6654 if (offset
< 0 || offset
> actual_length
)
6657 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6658 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6662 # define linux_read_loadmap NULL
6663 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6666 linux_process_qsupported (char **features
, int count
)
6668 if (the_low_target
.process_qsupported
!= NULL
)
6669 the_low_target
.process_qsupported (features
, count
);
6673 linux_supports_catch_syscall (void)
6675 return (the_low_target
.get_syscall_trapinfo
!= NULL
6676 && linux_supports_tracesysgood ());
6680 linux_get_ipa_tdesc_idx (void)
6682 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6685 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6689 linux_supports_tracepoints (void)
6691 if (*the_low_target
.supports_tracepoints
== NULL
)
6694 return (*the_low_target
.supports_tracepoints
) ();
6698 linux_read_pc (struct regcache
*regcache
)
6700 if (the_low_target
.get_pc
== NULL
)
6703 return (*the_low_target
.get_pc
) (regcache
);
6707 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6709 gdb_assert (the_low_target
.set_pc
!= NULL
);
6711 (*the_low_target
.set_pc
) (regcache
, pc
);
6715 linux_thread_stopped (struct thread_info
*thread
)
6717 return get_thread_lwp (thread
)->stopped
;
6720 /* This exposes stop-all-threads functionality to other modules. */
6723 linux_pause_all (int freeze
)
6725 stop_all_lwps (freeze
, NULL
);
6728 /* This exposes unstop-all-threads functionality to other gdbserver
6732 linux_unpause_all (int unfreeze
)
6734 unstop_all_lwps (unfreeze
, NULL
);
6738 linux_prepare_to_access_memory (void)
6740 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6743 linux_pause_all (1);
6748 linux_done_accessing_memory (void)
6750 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6753 linux_unpause_all (1);
6757 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6758 CORE_ADDR collector
,
6761 CORE_ADDR
*jump_entry
,
6762 CORE_ADDR
*trampoline
,
6763 ULONGEST
*trampoline_size
,
6764 unsigned char *jjump_pad_insn
,
6765 ULONGEST
*jjump_pad_insn_size
,
6766 CORE_ADDR
*adjusted_insn_addr
,
6767 CORE_ADDR
*adjusted_insn_addr_end
,
6770 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6771 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6772 jump_entry
, trampoline
, trampoline_size
,
6773 jjump_pad_insn
, jjump_pad_insn_size
,
6774 adjusted_insn_addr
, adjusted_insn_addr_end
,
6778 static struct emit_ops
*
6779 linux_emit_ops (void)
6781 if (the_low_target
.emit_ops
!= NULL
)
6782 return (*the_low_target
.emit_ops
) ();
6788 linux_get_min_fast_tracepoint_insn_len (void)
6790 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6793 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6796 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6797 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6799 char filename
[PATH_MAX
];
6801 const int auxv_size
= is_elf64
6802 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6803 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6805 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6807 fd
= open (filename
, O_RDONLY
);
6813 while (read (fd
, buf
, auxv_size
) == auxv_size
6814 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6818 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6820 switch (aux
->a_type
)
6823 *phdr_memaddr
= aux
->a_un
.a_val
;
6826 *num_phdr
= aux
->a_un
.a_val
;
6832 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6834 switch (aux
->a_type
)
6837 *phdr_memaddr
= aux
->a_un
.a_val
;
6840 *num_phdr
= aux
->a_un
.a_val
;
6848 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6850 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6851 "phdr_memaddr = %ld, phdr_num = %d",
6852 (long) *phdr_memaddr
, *num_phdr
);
6859 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6862 get_dynamic (const int pid
, const int is_elf64
)
6864 CORE_ADDR phdr_memaddr
, relocation
;
6866 unsigned char *phdr_buf
;
6867 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6869 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6872 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6873 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6875 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6878 /* Compute relocation: it is expected to be 0 for "regular" executables,
6879 non-zero for PIE ones. */
6881 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6884 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6886 if (p
->p_type
== PT_PHDR
)
6887 relocation
= phdr_memaddr
- p
->p_vaddr
;
6891 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6893 if (p
->p_type
== PT_PHDR
)
6894 relocation
= phdr_memaddr
- p
->p_vaddr
;
6897 if (relocation
== -1)
6899 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6900 any real world executables, including PIE executables, have always
6901 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6902 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6903 or present DT_DEBUG anyway (fpc binaries are statically linked).
6905 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6907 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6912 for (i
= 0; i
< num_phdr
; i
++)
6916 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6918 if (p
->p_type
== PT_DYNAMIC
)
6919 return p
->p_vaddr
+ relocation
;
6923 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6925 if (p
->p_type
== PT_DYNAMIC
)
6926 return p
->p_vaddr
+ relocation
;
6933 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6934 can be 0 if the inferior does not yet have the library list initialized.
6935 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6936 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6939 get_r_debug (const int pid
, const int is_elf64
)
6941 CORE_ADDR dynamic_memaddr
;
6942 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6943 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6946 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6947 if (dynamic_memaddr
== 0)
6950 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6954 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6955 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6959 unsigned char buf
[sizeof (Elf64_Xword
)];
6963 #ifdef DT_MIPS_RLD_MAP
6964 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6966 if (linux_read_memory (dyn
->d_un
.d_val
,
6967 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6972 #endif /* DT_MIPS_RLD_MAP */
6973 #ifdef DT_MIPS_RLD_MAP_REL
6974 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6976 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6977 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6982 #endif /* DT_MIPS_RLD_MAP_REL */
6984 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6985 map
= dyn
->d_un
.d_val
;
6987 if (dyn
->d_tag
== DT_NULL
)
6992 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6993 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6997 unsigned char buf
[sizeof (Elf32_Word
)];
7001 #ifdef DT_MIPS_RLD_MAP
7002 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
7004 if (linux_read_memory (dyn
->d_un
.d_val
,
7005 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7010 #endif /* DT_MIPS_RLD_MAP */
7011 #ifdef DT_MIPS_RLD_MAP_REL
7012 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
7014 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
7015 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7020 #endif /* DT_MIPS_RLD_MAP_REL */
7022 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
7023 map
= dyn
->d_un
.d_val
;
7025 if (dyn
->d_tag
== DT_NULL
)
7029 dynamic_memaddr
+= dyn_size
;
7035 /* Read one pointer from MEMADDR in the inferior. */
7038 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
7042 /* Go through a union so this works on either big or little endian
7043 hosts, when the inferior's pointer size is smaller than the size
7044 of CORE_ADDR. It is assumed the inferior's endianness is the
7045 same of the superior's. */
7048 CORE_ADDR core_addr
;
7053 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
7056 if (ptr_size
== sizeof (CORE_ADDR
))
7057 *ptr
= addr
.core_addr
;
7058 else if (ptr_size
== sizeof (unsigned int))
7061 gdb_assert_not_reached ("unhandled pointer size");
7066 struct link_map_offsets
7068 /* Offset and size of r_debug.r_version. */
7069 int r_version_offset
;
7071 /* Offset and size of r_debug.r_map. */
7074 /* Offset to l_addr field in struct link_map. */
7077 /* Offset to l_name field in struct link_map. */
7080 /* Offset to l_ld field in struct link_map. */
7083 /* Offset to l_next field in struct link_map. */
7086 /* Offset to l_prev field in struct link_map. */
7090 /* Construct qXfer:libraries-svr4:read reply. */
7093 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
7094 unsigned const char *writebuf
,
7095 CORE_ADDR offset
, int len
)
7098 unsigned document_len
;
7099 struct process_info_private
*const priv
= current_process ()->priv
;
7100 char filename
[PATH_MAX
];
7103 static const struct link_map_offsets lmo_32bit_offsets
=
7105 0, /* r_version offset. */
7106 4, /* r_debug.r_map offset. */
7107 0, /* l_addr offset in link_map. */
7108 4, /* l_name offset in link_map. */
7109 8, /* l_ld offset in link_map. */
7110 12, /* l_next offset in link_map. */
7111 16 /* l_prev offset in link_map. */
7114 static const struct link_map_offsets lmo_64bit_offsets
=
7116 0, /* r_version offset. */
7117 8, /* r_debug.r_map offset. */
7118 0, /* l_addr offset in link_map. */
7119 8, /* l_name offset in link_map. */
7120 16, /* l_ld offset in link_map. */
7121 24, /* l_next offset in link_map. */
7122 32 /* l_prev offset in link_map. */
7124 const struct link_map_offsets
*lmo
;
7125 unsigned int machine
;
7127 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7128 int allocated
= 1024;
7130 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7131 int header_done
= 0;
7133 if (writebuf
!= NULL
)
7135 if (readbuf
== NULL
)
7138 pid
= lwpid_of (current_thread
);
7139 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7140 is_elf64
= elf_64_file_p (filename
, &machine
);
7141 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7142 ptr_size
= is_elf64
? 8 : 4;
7144 while (annex
[0] != '\0')
7150 sep
= strchr (annex
, '=');
7155 if (len
== 5 && startswith (annex
, "start"))
7157 else if (len
== 4 && startswith (annex
, "prev"))
7161 annex
= strchr (sep
, ';');
7168 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7175 if (priv
->r_debug
== 0)
7176 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7178 /* We failed to find DT_DEBUG. Such situation will not change
7179 for this inferior - do not retry it. Report it to GDB as
7180 E01, see for the reasons at the GDB solib-svr4.c side. */
7181 if (priv
->r_debug
== (CORE_ADDR
) -1)
7184 if (priv
->r_debug
!= 0)
7186 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7187 (unsigned char *) &r_version
,
7188 sizeof (r_version
)) != 0
7191 warning ("unexpected r_debug version %d", r_version
);
7193 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7194 &lm_addr
, ptr_size
) != 0)
7196 warning ("unable to read r_map from 0x%lx",
7197 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7202 document
= (char *) xmalloc (allocated
);
7203 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7204 p
= document
+ strlen (document
);
7207 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7208 &l_name
, ptr_size
) == 0
7209 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7210 &l_addr
, ptr_size
) == 0
7211 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7212 &l_ld
, ptr_size
) == 0
7213 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7214 &l_prev
, ptr_size
) == 0
7215 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7216 &l_next
, ptr_size
) == 0)
7218 unsigned char libname
[PATH_MAX
];
7220 if (lm_prev
!= l_prev
)
7222 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7223 (long) lm_prev
, (long) l_prev
);
7227 /* Ignore the first entry even if it has valid name as the first entry
7228 corresponds to the main executable. The first entry should not be
7229 skipped if the dynamic loader was loaded late by a static executable
7230 (see solib-svr4.c parameter ignore_first). But in such case the main
7231 executable does not have PT_DYNAMIC present and this function already
7232 exited above due to failed get_r_debug. */
7235 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7240 /* Not checking for error because reading may stop before
7241 we've got PATH_MAX worth of characters. */
7243 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7244 libname
[sizeof (libname
) - 1] = '\0';
7245 if (libname
[0] != '\0')
7247 /* 6x the size for xml_escape_text below. */
7248 size_t len
= 6 * strlen ((char *) libname
);
7252 /* Terminate `<library-list-svr4'. */
7257 while (allocated
< p
- document
+ len
+ 200)
7259 /* Expand to guarantee sufficient storage. */
7260 uintptr_t document_len
= p
- document
;
7262 document
= (char *) xrealloc (document
, 2 * allocated
);
7264 p
= document
+ document_len
;
7267 std::string name
= xml_escape_text ((char *) libname
);
7268 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7269 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7270 name
.c_str (), (unsigned long) lm_addr
,
7271 (unsigned long) l_addr
, (unsigned long) l_ld
);
7281 /* Empty list; terminate `<library-list-svr4'. */
7285 strcpy (p
, "</library-list-svr4>");
7287 document_len
= strlen (document
);
7288 if (offset
< document_len
)
7289 document_len
-= offset
;
7292 if (len
> document_len
)
7295 memcpy (readbuf
, document
+ offset
, len
);
7301 #ifdef HAVE_LINUX_BTRACE
7303 /* See to_disable_btrace target method. */
7306 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7308 enum btrace_error err
;
7310 err
= linux_disable_btrace (tinfo
);
7311 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7314 /* Encode an Intel Processor Trace configuration. */
7317 linux_low_encode_pt_config (struct buffer
*buffer
,
7318 const struct btrace_data_pt_config
*config
)
7320 buffer_grow_str (buffer
, "<pt-config>\n");
7322 switch (config
->cpu
.vendor
)
7325 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7326 "model=\"%u\" stepping=\"%u\"/>\n",
7327 config
->cpu
.family
, config
->cpu
.model
,
7328 config
->cpu
.stepping
);
7335 buffer_grow_str (buffer
, "</pt-config>\n");
7338 /* Encode a raw buffer. */
7341 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7347 /* We use hex encoding - see common/rsp-low.h. */
7348 buffer_grow_str (buffer
, "<raw>\n");
7354 elem
[0] = tohex ((*data
>> 4) & 0xf);
7355 elem
[1] = tohex (*data
++ & 0xf);
7357 buffer_grow (buffer
, elem
, 2);
7360 buffer_grow_str (buffer
, "</raw>\n");
7363 /* See to_read_btrace target method. */
7366 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7367 enum btrace_read_type type
)
7369 struct btrace_data btrace
;
7370 struct btrace_block
*block
;
7371 enum btrace_error err
;
7374 btrace_data_init (&btrace
);
7376 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7377 if (err
!= BTRACE_ERR_NONE
)
7379 if (err
== BTRACE_ERR_OVERFLOW
)
7380 buffer_grow_str0 (buffer
, "E.Overflow.");
7382 buffer_grow_str0 (buffer
, "E.Generic Error.");
7387 switch (btrace
.format
)
7389 case BTRACE_FORMAT_NONE
:
7390 buffer_grow_str0 (buffer
, "E.No Trace.");
7393 case BTRACE_FORMAT_BTS
:
7394 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7395 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7398 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7400 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7401 paddress (block
->begin
), paddress (block
->end
));
7403 buffer_grow_str0 (buffer
, "</btrace>\n");
7406 case BTRACE_FORMAT_PT
:
7407 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7408 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7409 buffer_grow_str (buffer
, "<pt>\n");
7411 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7413 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7414 btrace
.variant
.pt
.size
);
7416 buffer_grow_str (buffer
, "</pt>\n");
7417 buffer_grow_str0 (buffer
, "</btrace>\n");
7421 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7425 btrace_data_fini (&btrace
);
7429 btrace_data_fini (&btrace
);
7433 /* See to_btrace_conf target method. */
7436 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7437 struct buffer
*buffer
)
7439 const struct btrace_config
*conf
;
7441 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7442 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7444 conf
= linux_btrace_conf (tinfo
);
7447 switch (conf
->format
)
7449 case BTRACE_FORMAT_NONE
:
7452 case BTRACE_FORMAT_BTS
:
7453 buffer_xml_printf (buffer
, "<bts");
7454 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7455 buffer_xml_printf (buffer
, " />\n");
7458 case BTRACE_FORMAT_PT
:
7459 buffer_xml_printf (buffer
, "<pt");
7460 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7461 buffer_xml_printf (buffer
, "/>\n");
7466 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7469 #endif /* HAVE_LINUX_BTRACE */
7471 /* See nat/linux-nat.h. */
7474 current_lwp_ptid (void)
7476 return ptid_of (current_thread
);
7479 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7482 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7484 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7485 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7487 return default_breakpoint_kind_from_pc (pcptr
);
7490 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7492 static const gdb_byte
*
7493 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7495 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7497 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7500 /* Implementation of the target_ops method
7501 "breakpoint_kind_from_current_state". */
7504 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7506 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7507 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7509 return linux_breakpoint_kind_from_pc (pcptr
);
7512 /* Default implementation of linux_target_ops method "set_pc" for
7513 32-bit pc register which is literally named "pc". */
7516 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7518 uint32_t newpc
= pc
;
7520 supply_register_by_name (regcache
, "pc", &newpc
);
7523 /* Default implementation of linux_target_ops method "get_pc" for
7524 32-bit pc register which is literally named "pc". */
7527 linux_get_pc_32bit (struct regcache
*regcache
)
7531 collect_register_by_name (regcache
, "pc", &pc
);
7533 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7537 /* Default implementation of linux_target_ops method "set_pc" for
7538 64-bit pc register which is literally named "pc". */
7541 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7543 uint64_t newpc
= pc
;
7545 supply_register_by_name (regcache
, "pc", &newpc
);
7548 /* Default implementation of linux_target_ops method "get_pc" for
7549 64-bit pc register which is literally named "pc". */
7552 linux_get_pc_64bit (struct regcache
*regcache
)
7556 collect_register_by_name (regcache
, "pc", &pc
);
7558 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7563 static struct target_ops linux_target_ops
= {
7564 linux_create_inferior
,
7565 linux_post_create_inferior
,
7574 linux_fetch_registers
,
7575 linux_store_registers
,
7576 linux_prepare_to_access_memory
,
7577 linux_done_accessing_memory
,
7580 linux_look_up_symbols
,
7581 linux_request_interrupt
,
7583 linux_supports_z_point_type
,
7586 linux_stopped_by_sw_breakpoint
,
7587 linux_supports_stopped_by_sw_breakpoint
,
7588 linux_stopped_by_hw_breakpoint
,
7589 linux_supports_stopped_by_hw_breakpoint
,
7590 linux_supports_hardware_single_step
,
7591 linux_stopped_by_watchpoint
,
7592 linux_stopped_data_address
,
7593 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7594 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7595 && defined(PT_TEXT_END_ADDR)
7600 #ifdef USE_THREAD_DB
7601 thread_db_get_tls_address
,
7606 hostio_last_error_from_errno
,
7609 linux_supports_non_stop
,
7611 linux_start_non_stop
,
7612 linux_supports_multi_process
,
7613 linux_supports_fork_events
,
7614 linux_supports_vfork_events
,
7615 linux_supports_exec_events
,
7616 linux_handle_new_gdb_connection
,
7617 #ifdef USE_THREAD_DB
7618 thread_db_handle_monitor_command
,
7622 linux_common_core_of_thread
,
7624 linux_process_qsupported
,
7625 linux_supports_tracepoints
,
7628 linux_thread_stopped
,
7632 linux_stabilize_threads
,
7633 linux_install_fast_tracepoint_jump_pad
,
7635 linux_supports_disable_randomization
,
7636 linux_get_min_fast_tracepoint_insn_len
,
7637 linux_qxfer_libraries_svr4
,
7638 linux_supports_agent
,
7639 #ifdef HAVE_LINUX_BTRACE
7640 linux_supports_btrace
,
7641 linux_enable_btrace
,
7642 linux_low_disable_btrace
,
7643 linux_low_read_btrace
,
7644 linux_low_btrace_conf
,
7652 linux_supports_range_stepping
,
7653 linux_proc_pid_to_exec_file
,
7654 linux_mntns_open_cloexec
,
7656 linux_mntns_readlink
,
7657 linux_breakpoint_kind_from_pc
,
7658 linux_sw_breakpoint_from_kind
,
7659 linux_proc_tid_get_name
,
7660 linux_breakpoint_kind_from_current_state
,
7661 linux_supports_software_single_step
,
7662 linux_supports_catch_syscall
,
7663 linux_get_ipa_tdesc_idx
,
7665 thread_db_thread_handle
,
7671 #ifdef HAVE_LINUX_REGSETS
7673 initialize_regsets_info (struct regsets_info
*info
)
7675 for (info
->num_regsets
= 0;
7676 info
->regsets
[info
->num_regsets
].size
>= 0;
7677 info
->num_regsets
++)
7683 initialize_low (void)
7685 struct sigaction sigchld_action
;
7687 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7688 set_target_ops (&linux_target_ops
);
7690 linux_ptrace_init_warnings ();
7692 sigchld_action
.sa_handler
= sigchld_handler
;
7693 sigemptyset (&sigchld_action
.sa_mask
);
7694 sigchld_action
.sa_flags
= SA_RESTART
;
7695 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7697 initialize_low_arch ();
7699 linux_check_ptrace_features ();