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 (struct inferior_list_entry
*entry
, 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
));
417 free (lwp
->arch_private
);
421 /* Add a process to the common process list, and set its private
424 static struct process_info
*
425 linux_add_process (int pid
, int attached
)
427 struct process_info
*proc
;
429 proc
= add_process (pid
, attached
);
430 proc
->priv
= XCNEW (struct process_info_private
);
432 if (the_low_target
.new_process
!= NULL
)
433 proc
->priv
->arch_private
= the_low_target
.new_process ();
438 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
440 /* Call the target arch_setup function on the current thread. */
443 linux_arch_setup (void)
445 the_low_target
.arch_setup ();
448 /* Call the target arch_setup function on THREAD. */
451 linux_arch_setup_thread (struct thread_info
*thread
)
453 struct thread_info
*saved_thread
;
455 saved_thread
= current_thread
;
456 current_thread
= thread
;
460 current_thread
= saved_thread
;
463 /* Handle a GNU/Linux extended wait response. If we see a clone,
464 fork, or vfork event, we need to add the new LWP to our list
465 (and return 0 so as not to report the trap to higher layers).
466 If we see an exec event, we will modify ORIG_EVENT_LWP to point
467 to a new LWP representing the new program. */
470 handle_extended_wait (struct lwp_info
**orig_event_lwp
, int wstat
)
472 struct lwp_info
*event_lwp
= *orig_event_lwp
;
473 int event
= linux_ptrace_get_extended_event (wstat
);
474 struct thread_info
*event_thr
= get_lwp_thread (event_lwp
);
475 struct lwp_info
*new_lwp
;
477 gdb_assert (event_lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
479 /* All extended events we currently use are mid-syscall. Only
480 PTRACE_EVENT_STOP is delivered more like a signal-stop, but
481 you have to be using PTRACE_SEIZE to get that. */
482 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
484 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
485 || (event
== PTRACE_EVENT_CLONE
))
488 unsigned long new_pid
;
491 /* Get the pid of the new lwp. */
492 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
495 /* If we haven't already seen the new PID stop, wait for it now. */
496 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
498 /* The new child has a pending SIGSTOP. We can't affect it until it
499 hits the SIGSTOP, but we're already attached. */
501 ret
= my_waitpid (new_pid
, &status
, __WALL
);
504 perror_with_name ("waiting for new child");
505 else if (ret
!= new_pid
)
506 warning ("wait returned unexpected PID %d", ret
);
507 else if (!WIFSTOPPED (status
))
508 warning ("wait returned unexpected status 0x%x", status
);
511 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
513 struct process_info
*parent_proc
;
514 struct process_info
*child_proc
;
515 struct lwp_info
*child_lwp
;
516 struct thread_info
*child_thr
;
517 struct target_desc
*tdesc
;
519 ptid
= ptid_build (new_pid
, new_pid
, 0);
523 debug_printf ("HEW: Got fork event from LWP %ld, "
525 ptid_get_lwp (ptid_of (event_thr
)),
526 ptid_get_pid (ptid
));
529 /* Add the new process to the tables and clone the breakpoint
530 lists of the parent. We need to do this even if the new process
531 will be detached, since we will need the process object and the
532 breakpoints to remove any breakpoints from memory when we
533 detach, and the client side will access registers. */
534 child_proc
= linux_add_process (new_pid
, 0);
535 gdb_assert (child_proc
!= NULL
);
536 child_lwp
= add_lwp (ptid
);
537 gdb_assert (child_lwp
!= NULL
);
538 child_lwp
->stopped
= 1;
539 child_lwp
->must_set_ptrace_flags
= 1;
540 child_lwp
->status_pending_p
= 0;
541 child_thr
= get_lwp_thread (child_lwp
);
542 child_thr
->last_resume_kind
= resume_stop
;
543 child_thr
->last_status
.kind
= TARGET_WAITKIND_STOPPED
;
545 /* If we're suspending all threads, leave this one suspended
546 too. If the fork/clone parent is stepping over a breakpoint,
547 all other threads have been suspended already. Leave the
548 child suspended too. */
549 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
550 || event_lwp
->bp_reinsert
!= 0)
553 debug_printf ("HEW: leaving child suspended\n");
554 child_lwp
->suspended
= 1;
557 parent_proc
= get_thread_process (event_thr
);
558 child_proc
->attached
= parent_proc
->attached
;
560 if (event_lwp
->bp_reinsert
!= 0
561 && can_software_single_step ()
562 && event
== PTRACE_EVENT_VFORK
)
564 /* If we leave single-step breakpoints there, child will
565 hit it, so uninsert single-step breakpoints from parent
566 (and child). Once vfork child is done, reinsert
567 them back to parent. */
568 uninsert_single_step_breakpoints (event_thr
);
571 clone_all_breakpoints (child_thr
, event_thr
);
573 tdesc
= XNEW (struct target_desc
);
574 copy_target_description (tdesc
, parent_proc
->tdesc
);
575 child_proc
->tdesc
= tdesc
;
577 /* Clone arch-specific process data. */
578 if (the_low_target
.new_fork
!= NULL
)
579 the_low_target
.new_fork (parent_proc
, child_proc
);
581 /* Save fork info in the parent thread. */
582 if (event
== PTRACE_EVENT_FORK
)
583 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
584 else if (event
== PTRACE_EVENT_VFORK
)
585 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
587 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
589 /* The status_pending field contains bits denoting the
590 extended event, so when the pending event is handled,
591 the handler will look at lwp->waitstatus. */
592 event_lwp
->status_pending_p
= 1;
593 event_lwp
->status_pending
= wstat
;
595 /* Link the threads until the parent event is passed on to
597 event_lwp
->fork_relative
= child_lwp
;
598 child_lwp
->fork_relative
= event_lwp
;
600 /* If the parent thread is doing step-over with single-step
601 breakpoints, the list of single-step breakpoints are cloned
602 from the parent's. Remove them from the child process.
603 In case of vfork, we'll reinsert them back once vforked
605 if (event_lwp
->bp_reinsert
!= 0
606 && can_software_single_step ())
608 /* The child process is forked and stopped, so it is safe
609 to access its memory without stopping all other threads
610 from other processes. */
611 delete_single_step_breakpoints (child_thr
);
613 gdb_assert (has_single_step_breakpoints (event_thr
));
614 gdb_assert (!has_single_step_breakpoints (child_thr
));
617 /* Report the event. */
622 debug_printf ("HEW: Got clone event "
623 "from LWP %ld, new child is LWP %ld\n",
624 lwpid_of (event_thr
), new_pid
);
626 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
627 new_lwp
= add_lwp (ptid
);
629 /* Either we're going to immediately resume the new thread
630 or leave it stopped. linux_resume_one_lwp is a nop if it
631 thinks the thread is currently running, so set this first
632 before calling linux_resume_one_lwp. */
633 new_lwp
->stopped
= 1;
635 /* If we're suspending all threads, leave this one suspended
636 too. If the fork/clone parent is stepping over a breakpoint,
637 all other threads have been suspended already. Leave the
638 child suspended too. */
639 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
640 || event_lwp
->bp_reinsert
!= 0)
641 new_lwp
->suspended
= 1;
643 /* Normally we will get the pending SIGSTOP. But in some cases
644 we might get another signal delivered to the group first.
645 If we do get another signal, be sure not to lose it. */
646 if (WSTOPSIG (status
) != SIGSTOP
)
648 new_lwp
->stop_expected
= 1;
649 new_lwp
->status_pending_p
= 1;
650 new_lwp
->status_pending
= status
;
652 else if (report_thread_events
)
654 new_lwp
->waitstatus
.kind
= TARGET_WAITKIND_THREAD_CREATED
;
655 new_lwp
->status_pending_p
= 1;
656 new_lwp
->status_pending
= status
;
659 /* Don't report the event. */
662 else if (event
== PTRACE_EVENT_VFORK_DONE
)
664 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
666 if (event_lwp
->bp_reinsert
!= 0 && can_software_single_step ())
668 reinsert_single_step_breakpoints (event_thr
);
670 gdb_assert (has_single_step_breakpoints (event_thr
));
673 /* Report the event. */
676 else if (event
== PTRACE_EVENT_EXEC
&& report_exec_events
)
678 struct process_info
*proc
;
679 VEC (int) *syscalls_to_catch
;
685 debug_printf ("HEW: Got exec event from LWP %ld\n",
686 lwpid_of (event_thr
));
689 /* Get the event ptid. */
690 event_ptid
= ptid_of (event_thr
);
691 event_pid
= ptid_get_pid (event_ptid
);
693 /* Save the syscall list from the execing process. */
694 proc
= get_thread_process (event_thr
);
695 syscalls_to_catch
= proc
->syscalls_to_catch
;
696 proc
->syscalls_to_catch
= NULL
;
698 /* Delete the execing process and all its threads. */
700 current_thread
= NULL
;
702 /* Create a new process/lwp/thread. */
703 proc
= linux_add_process (event_pid
, 0);
704 event_lwp
= add_lwp (event_ptid
);
705 event_thr
= get_lwp_thread (event_lwp
);
706 gdb_assert (current_thread
== event_thr
);
707 linux_arch_setup_thread (event_thr
);
709 /* Set the event status. */
710 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
711 event_lwp
->waitstatus
.value
.execd_pathname
712 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
714 /* Mark the exec status as pending. */
715 event_lwp
->stopped
= 1;
716 event_lwp
->status_pending_p
= 1;
717 event_lwp
->status_pending
= wstat
;
718 event_thr
->last_resume_kind
= resume_continue
;
719 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
721 /* Update syscall state in the new lwp, effectively mid-syscall too. */
722 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
724 /* Restore the list to catch. Don't rely on the client, which is free
725 to avoid sending a new list when the architecture doesn't change.
726 Also, for ANY_SYSCALL, the architecture doesn't really matter. */
727 proc
->syscalls_to_catch
= syscalls_to_catch
;
729 /* Report the event. */
730 *orig_event_lwp
= event_lwp
;
734 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
737 /* Return the PC as read from the regcache of LWP, without any
741 get_pc (struct lwp_info
*lwp
)
743 struct thread_info
*saved_thread
;
744 struct regcache
*regcache
;
747 if (the_low_target
.get_pc
== NULL
)
750 saved_thread
= current_thread
;
751 current_thread
= get_lwp_thread (lwp
);
753 regcache
= get_thread_regcache (current_thread
, 1);
754 pc
= (*the_low_target
.get_pc
) (regcache
);
757 debug_printf ("pc is 0x%lx\n", (long) pc
);
759 current_thread
= saved_thread
;
763 /* This function should only be called if LWP got a SYSCALL_SIGTRAP.
764 Fill *SYSNO with the syscall nr trapped. */
767 get_syscall_trapinfo (struct lwp_info
*lwp
, int *sysno
)
769 struct thread_info
*saved_thread
;
770 struct regcache
*regcache
;
772 if (the_low_target
.get_syscall_trapinfo
== NULL
)
774 /* If we cannot get the syscall trapinfo, report an unknown
775 system call number. */
776 *sysno
= UNKNOWN_SYSCALL
;
780 saved_thread
= current_thread
;
781 current_thread
= get_lwp_thread (lwp
);
783 regcache
= get_thread_regcache (current_thread
, 1);
784 (*the_low_target
.get_syscall_trapinfo
) (regcache
, sysno
);
787 debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno
);
789 current_thread
= saved_thread
;
792 static int check_stopped_by_watchpoint (struct lwp_info
*child
);
794 /* Called when the LWP stopped for a signal/trap. If it stopped for a
795 trap check what caused it (breakpoint, watchpoint, trace, etc.),
796 and save the result in the LWP's stop_reason field. If it stopped
797 for a breakpoint, decrement the PC if necessary on the lwp's
798 architecture. Returns true if we now have the LWP's stop PC. */
801 save_stop_reason (struct lwp_info
*lwp
)
804 CORE_ADDR sw_breakpoint_pc
;
805 struct thread_info
*saved_thread
;
806 #if USE_SIGTRAP_SIGINFO
810 if (the_low_target
.get_pc
== NULL
)
814 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
816 /* breakpoint_at reads from the current thread. */
817 saved_thread
= current_thread
;
818 current_thread
= get_lwp_thread (lwp
);
820 #if USE_SIGTRAP_SIGINFO
821 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
822 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
824 if (siginfo
.si_signo
== SIGTRAP
)
826 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
)
827 && GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
829 /* The si_code is ambiguous on this arch -- check debug
831 if (!check_stopped_by_watchpoint (lwp
))
832 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
834 else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
836 /* If we determine the LWP stopped for a SW breakpoint,
837 trust it. Particularly don't check watchpoint
838 registers, because at least on s390, we'd find
839 stopped-by-watchpoint as long as there's a watchpoint
841 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
843 else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
845 /* This can indicate either a hardware breakpoint or
846 hardware watchpoint. Check debug registers. */
847 if (!check_stopped_by_watchpoint (lwp
))
848 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
850 else if (siginfo
.si_code
== TRAP_TRACE
)
852 /* We may have single stepped an instruction that
853 triggered a watchpoint. In that case, on some
854 architectures (such as x86), instead of TRAP_HWBKPT,
855 si_code indicates TRAP_TRACE, and we need to check
856 the debug registers separately. */
857 if (!check_stopped_by_watchpoint (lwp
))
858 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
863 /* We may have just stepped a breakpoint instruction. E.g., in
864 non-stop mode, GDB first tells the thread A to step a range, and
865 then the user inserts a breakpoint inside the range. In that
866 case we need to report the breakpoint PC. */
867 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
868 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
869 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
871 if (hardware_breakpoint_inserted_here (pc
))
872 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
874 if (lwp
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
)
875 check_stopped_by_watchpoint (lwp
);
878 if (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
882 struct thread_info
*thr
= get_lwp_thread (lwp
);
884 debug_printf ("CSBB: %s stopped by software breakpoint\n",
885 target_pid_to_str (ptid_of (thr
)));
888 /* Back up the PC if necessary. */
889 if (pc
!= sw_breakpoint_pc
)
891 struct regcache
*regcache
892 = get_thread_regcache (current_thread
, 1);
893 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
896 /* Update this so we record the correct stop PC below. */
897 pc
= sw_breakpoint_pc
;
899 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
)
903 struct thread_info
*thr
= get_lwp_thread (lwp
);
905 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
906 target_pid_to_str (ptid_of (thr
)));
909 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
913 struct thread_info
*thr
= get_lwp_thread (lwp
);
915 debug_printf ("CSBB: %s stopped by hardware watchpoint\n",
916 target_pid_to_str (ptid_of (thr
)));
919 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
)
923 struct thread_info
*thr
= get_lwp_thread (lwp
);
925 debug_printf ("CSBB: %s stopped by trace\n",
926 target_pid_to_str (ptid_of (thr
)));
931 current_thread
= saved_thread
;
935 static struct lwp_info
*
936 add_lwp (ptid_t ptid
)
938 struct lwp_info
*lwp
;
940 lwp
= XCNEW (struct lwp_info
);
942 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
944 if (the_low_target
.new_thread
!= NULL
)
945 the_low_target
.new_thread (lwp
);
947 lwp
->thread
= add_thread (ptid
, lwp
);
952 /* Callback to be used when calling fork_inferior, responsible for
953 actually initiating the tracing of the inferior. */
958 if (ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0,
959 (PTRACE_TYPE_ARG4
) 0) < 0)
960 trace_start_error_with_name ("ptrace");
962 if (setpgid (0, 0) < 0)
963 trace_start_error_with_name ("setpgid");
965 /* If GDBserver is connected to gdb via stdio, redirect the inferior's
966 stdout to stderr so that inferior i/o doesn't corrupt the connection.
967 Also, redirect stdin to /dev/null. */
968 if (remote_connection_is_stdio ())
971 trace_start_error_with_name ("close");
972 if (open ("/dev/null", O_RDONLY
) < 0)
973 trace_start_error_with_name ("open");
975 trace_start_error_with_name ("dup2");
976 if (write (2, "stdin/stdout redirected\n",
977 sizeof ("stdin/stdout redirected\n") - 1) < 0)
979 /* Errors ignored. */;
984 /* Start an inferior process and returns its pid.
985 PROGRAM is the name of the program to be started, and PROGRAM_ARGS
986 are its arguments. */
989 linux_create_inferior (const char *program
,
990 const std::vector
<char *> &program_args
)
992 struct lwp_info
*new_lwp
;
995 struct cleanup
*restore_personality
996 = maybe_disable_address_space_randomization (disable_randomization
);
997 std::string str_program_args
= stringify_argv (program_args
);
999 pid
= fork_inferior (program
,
1000 str_program_args
.c_str (),
1001 get_environ ()->envp (), linux_ptrace_fun
,
1002 NULL
, NULL
, NULL
, NULL
);
1004 do_cleanups (restore_personality
);
1006 linux_add_process (pid
, 0);
1008 ptid
= ptid_build (pid
, pid
, 0);
1009 new_lwp
= add_lwp (ptid
);
1010 new_lwp
->must_set_ptrace_flags
= 1;
1012 post_fork_inferior (pid
, program
);
1017 /* Implement the post_create_inferior target_ops method. */
1020 linux_post_create_inferior (void)
1022 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
1024 linux_arch_setup ();
1026 if (lwp
->must_set_ptrace_flags
)
1028 struct process_info
*proc
= current_process ();
1029 int options
= linux_low_ptrace_options (proc
->attached
);
1031 linux_enable_event_reporting (lwpid_of (current_thread
), options
);
1032 lwp
->must_set_ptrace_flags
= 0;
1036 /* Attach to an inferior process. Returns 0 on success, ERRNO on
1040 linux_attach_lwp (ptid_t ptid
)
1042 struct lwp_info
*new_lwp
;
1043 int lwpid
= ptid_get_lwp (ptid
);
1045 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
1049 new_lwp
= add_lwp (ptid
);
1051 /* We need to wait for SIGSTOP before being able to make the next
1052 ptrace call on this LWP. */
1053 new_lwp
->must_set_ptrace_flags
= 1;
1055 if (linux_proc_pid_is_stopped (lwpid
))
1058 debug_printf ("Attached to a stopped process\n");
1060 /* The process is definitely stopped. It is in a job control
1061 stop, unless the kernel predates the TASK_STOPPED /
1062 TASK_TRACED distinction, in which case it might be in a
1063 ptrace stop. Make sure it is in a ptrace stop; from there we
1064 can kill it, signal it, et cetera.
1066 First make sure there is a pending SIGSTOP. Since we are
1067 already attached, the process can not transition from stopped
1068 to running without a PTRACE_CONT; so we know this signal will
1069 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1070 probably already in the queue (unless this kernel is old
1071 enough to use TASK_STOPPED for ptrace stops); but since
1072 SIGSTOP is not an RT signal, it can only be queued once. */
1073 kill_lwp (lwpid
, SIGSTOP
);
1075 /* Finally, resume the stopped process. This will deliver the
1076 SIGSTOP (or a higher priority signal, just like normal
1077 PTRACE_ATTACH), which we'll catch later on. */
1078 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1081 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
1082 brings it to a halt.
1084 There are several cases to consider here:
1086 1) gdbserver has already attached to the process and is being notified
1087 of a new thread that is being created.
1088 In this case we should ignore that SIGSTOP and resume the
1089 process. This is handled below by setting stop_expected = 1,
1090 and the fact that add_thread sets last_resume_kind ==
1093 2) This is the first thread (the process thread), and we're attaching
1094 to it via attach_inferior.
1095 In this case we want the process thread to stop.
1096 This is handled by having linux_attach set last_resume_kind ==
1097 resume_stop after we return.
1099 If the pid we are attaching to is also the tgid, we attach to and
1100 stop all the existing threads. Otherwise, we attach to pid and
1101 ignore any other threads in the same group as this pid.
1103 3) GDB is connecting to gdbserver and is requesting an enumeration of all
1105 In this case we want the thread to stop.
1106 FIXME: This case is currently not properly handled.
1107 We should wait for the SIGSTOP but don't. Things work apparently
1108 because enough time passes between when we ptrace (ATTACH) and when
1109 gdb makes the next ptrace call on the thread.
1111 On the other hand, if we are currently trying to stop all threads, we
1112 should treat the new thread as if we had sent it a SIGSTOP. This works
1113 because we are guaranteed that the add_lwp call above added us to the
1114 end of the list, and so the new thread has not yet reached
1115 wait_for_sigstop (but will). */
1116 new_lwp
->stop_expected
= 1;
1121 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
1122 already attached. Returns true if a new LWP is found, false
1126 attach_proc_task_lwp_callback (ptid_t ptid
)
1128 /* Is this a new thread? */
1129 if (find_thread_ptid (ptid
) == NULL
)
1131 int lwpid
= ptid_get_lwp (ptid
);
1135 debug_printf ("Found new lwp %d\n", lwpid
);
1137 err
= linux_attach_lwp (ptid
);
1139 /* Be quiet if we simply raced with the thread exiting. EPERM
1140 is returned if the thread's task still exists, and is marked
1141 as exited or zombie, as well as other conditions, so in that
1142 case, confirm the status in /proc/PID/status. */
1144 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1148 debug_printf ("Cannot attach to lwp %d: "
1149 "thread is gone (%d: %s)\n",
1150 lwpid
, err
, strerror (err
));
1155 warning (_("Cannot attach to lwp %d: %s"),
1157 linux_ptrace_attach_fail_reason_string (ptid
, err
));
1165 static void async_file_mark (void);
1167 /* Attach to PID. If PID is the tgid, attach to it and all
1171 linux_attach (unsigned long pid
)
1173 struct process_info
*proc
;
1174 struct thread_info
*initial_thread
;
1175 ptid_t ptid
= ptid_build (pid
, pid
, 0);
1178 /* Attach to PID. We will check for other threads
1180 err
= linux_attach_lwp (ptid
);
1182 error ("Cannot attach to process %ld: %s",
1183 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
1185 proc
= linux_add_process (pid
, 1);
1187 /* Don't ignore the initial SIGSTOP if we just attached to this
1188 process. It will be collected by wait shortly. */
1189 initial_thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
1190 initial_thread
->last_resume_kind
= resume_stop
;
1192 /* We must attach to every LWP. If /proc is mounted, use that to
1193 find them now. On the one hand, the inferior may be using raw
1194 clone instead of using pthreads. On the other hand, even if it
1195 is using pthreads, GDB may not be connected yet (thread_db needs
1196 to do symbol lookups, through qSymbol). Also, thread_db walks
1197 structures in the inferior's address space to find the list of
1198 threads/LWPs, and those structures may well be corrupted. Note
1199 that once thread_db is loaded, we'll still use it to list threads
1200 and associate pthread info with each LWP. */
1201 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1203 /* GDB will shortly read the xml target description for this
1204 process, to figure out the process' architecture. But the target
1205 description is only filled in when the first process/thread in
1206 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1207 that now, otherwise, if GDB is fast enough, it could read the
1208 target description _before_ that initial stop. */
1211 struct lwp_info
*lwp
;
1213 ptid_t pid_ptid
= pid_to_ptid (pid
);
1215 lwpid
= linux_wait_for_event_filtered (pid_ptid
, pid_ptid
,
1217 gdb_assert (lwpid
> 0);
1219 lwp
= find_lwp_pid (pid_to_ptid (lwpid
));
1221 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGSTOP
)
1223 lwp
->status_pending_p
= 1;
1224 lwp
->status_pending
= wstat
;
1227 initial_thread
->last_resume_kind
= resume_continue
;
1231 gdb_assert (proc
->tdesc
!= NULL
);
1244 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
1246 struct counter
*counter
= (struct counter
*) args
;
1248 if (ptid_get_pid (entry
->id
) == counter
->pid
)
1250 if (++counter
->count
> 1)
1258 last_thread_of_process_p (int pid
)
1260 struct counter counter
= { pid
, 0 };
1262 return (find_inferior (&all_threads
,
1263 second_thread_of_pid_p
, &counter
) == NULL
);
1269 linux_kill_one_lwp (struct lwp_info
*lwp
)
1271 struct thread_info
*thr
= get_lwp_thread (lwp
);
1272 int pid
= lwpid_of (thr
);
1274 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1275 there is no signal context, and ptrace(PTRACE_KILL) (or
1276 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1277 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1278 alternative is to kill with SIGKILL. We only need one SIGKILL
1279 per process, not one for each thread. But since we still support
1280 support debugging programs using raw clone without CLONE_THREAD,
1281 we send one for each thread. For years, we used PTRACE_KILL
1282 only, so we're being a bit paranoid about some old kernels where
1283 PTRACE_KILL might work better (dubious if there are any such, but
1284 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1285 second, and so we're fine everywhere. */
1288 kill_lwp (pid
, SIGKILL
);
1291 int save_errno
= errno
;
1293 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1294 target_pid_to_str (ptid_of (thr
)),
1295 save_errno
? strerror (save_errno
) : "OK");
1299 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1302 int save_errno
= errno
;
1304 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1305 target_pid_to_str (ptid_of (thr
)),
1306 save_errno
? strerror (save_errno
) : "OK");
1310 /* Kill LWP and wait for it to die. */
1313 kill_wait_lwp (struct lwp_info
*lwp
)
1315 struct thread_info
*thr
= get_lwp_thread (lwp
);
1316 int pid
= ptid_get_pid (ptid_of (thr
));
1317 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1322 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1326 linux_kill_one_lwp (lwp
);
1328 /* Make sure it died. Notes:
1330 - The loop is most likely unnecessary.
1332 - We don't use linux_wait_for_event as that could delete lwps
1333 while we're iterating over them. We're not interested in
1334 any pending status at this point, only in making sure all
1335 wait status on the kernel side are collected until the
1338 - We don't use __WALL here as the __WALL emulation relies on
1339 SIGCHLD, and killing a stopped process doesn't generate
1340 one, nor an exit status.
1342 res
= my_waitpid (lwpid
, &wstat
, 0);
1343 if (res
== -1 && errno
== ECHILD
)
1344 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1345 } while (res
> 0 && WIFSTOPPED (wstat
));
1347 /* Even if it was stopped, the child may have already disappeared.
1348 E.g., if it was killed by SIGKILL. */
1349 if (res
< 0 && errno
!= ECHILD
)
1350 perror_with_name ("kill_wait_lwp");
1353 /* Callback for `find_inferior'. Kills an lwp of a given process,
1354 except the leader. */
1357 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1359 struct thread_info
*thread
= (struct thread_info
*) entry
;
1360 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1361 int pid
= * (int *) args
;
1363 if (ptid_get_pid (entry
->id
) != pid
)
1366 /* We avoid killing the first thread here, because of a Linux kernel (at
1367 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1368 the children get a chance to be reaped, it will remain a zombie
1371 if (lwpid_of (thread
) == pid
)
1374 debug_printf ("lkop: is last of process %s\n",
1375 target_pid_to_str (entry
->id
));
1379 kill_wait_lwp (lwp
);
1384 linux_kill (int pid
)
1386 struct process_info
*process
;
1387 struct lwp_info
*lwp
;
1389 process
= find_process_pid (pid
);
1390 if (process
== NULL
)
1393 /* If we're killing a running inferior, make sure it is stopped
1394 first, as PTRACE_KILL will not work otherwise. */
1395 stop_all_lwps (0, NULL
);
1397 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1399 /* See the comment in linux_kill_one_lwp. We did not kill the first
1400 thread in the list, so do so now. */
1401 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1406 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1410 kill_wait_lwp (lwp
);
1412 the_target
->mourn (process
);
1414 /* Since we presently can only stop all lwps of all processes, we
1415 need to unstop lwps of other processes. */
1416 unstop_all_lwps (0, NULL
);
1420 /* Get pending signal of THREAD, for detaching purposes. This is the
1421 signal the thread last stopped for, which we need to deliver to the
1422 thread when detaching, otherwise, it'd be suppressed/lost. */
1425 get_detach_signal (struct thread_info
*thread
)
1427 enum gdb_signal signo
= GDB_SIGNAL_0
;
1429 struct lwp_info
*lp
= get_thread_lwp (thread
);
1431 if (lp
->status_pending_p
)
1432 status
= lp
->status_pending
;
1435 /* If the thread had been suspended by gdbserver, and it stopped
1436 cleanly, then it'll have stopped with SIGSTOP. But we don't
1437 want to deliver that SIGSTOP. */
1438 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1439 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1442 /* Otherwise, we may need to deliver the signal we
1444 status
= lp
->last_status
;
1447 if (!WIFSTOPPED (status
))
1450 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1451 target_pid_to_str (ptid_of (thread
)));
1455 /* Extended wait statuses aren't real SIGTRAPs. */
1456 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1459 debug_printf ("GPS: lwp %s had stopped with extended "
1460 "status: no pending signal\n",
1461 target_pid_to_str (ptid_of (thread
)));
1465 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1467 if (program_signals_p
&& !program_signals
[signo
])
1470 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1471 target_pid_to_str (ptid_of (thread
)),
1472 gdb_signal_to_string (signo
));
1475 else if (!program_signals_p
1476 /* If we have no way to know which signals GDB does not
1477 want to have passed to the program, assume
1478 SIGTRAP/SIGINT, which is GDB's default. */
1479 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1482 debug_printf ("GPS: lwp %s had signal %s, "
1483 "but we don't know if we should pass it. "
1484 "Default to not.\n",
1485 target_pid_to_str (ptid_of (thread
)),
1486 gdb_signal_to_string (signo
));
1492 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1493 target_pid_to_str (ptid_of (thread
)),
1494 gdb_signal_to_string (signo
));
1496 return WSTOPSIG (status
);
1500 /* Detach from LWP. */
1503 linux_detach_one_lwp (struct lwp_info
*lwp
)
1505 struct thread_info
*thread
= get_lwp_thread (lwp
);
1509 /* If there is a pending SIGSTOP, get rid of it. */
1510 if (lwp
->stop_expected
)
1513 debug_printf ("Sending SIGCONT to %s\n",
1514 target_pid_to_str (ptid_of (thread
)));
1516 kill_lwp (lwpid_of (thread
), SIGCONT
);
1517 lwp
->stop_expected
= 0;
1520 /* Pass on any pending signal for this thread. */
1521 sig
= get_detach_signal (thread
);
1523 /* Preparing to resume may try to write registers, and fail if the
1524 lwp is zombie. If that happens, ignore the error. We'll handle
1525 it below, when detach fails with ESRCH. */
1528 /* Flush any pending changes to the process's registers. */
1529 regcache_invalidate_thread (thread
);
1531 /* Finally, let it resume. */
1532 if (the_low_target
.prepare_to_resume
!= NULL
)
1533 the_low_target
.prepare_to_resume (lwp
);
1535 CATCH (ex
, RETURN_MASK_ERROR
)
1537 if (!check_ptrace_stopped_lwp_gone (lwp
))
1538 throw_exception (ex
);
1542 lwpid
= lwpid_of (thread
);
1543 if (ptrace (PTRACE_DETACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0,
1544 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1546 int save_errno
= errno
;
1548 /* We know the thread exists, so ESRCH must mean the lwp is
1549 zombie. This can happen if one of the already-detached
1550 threads exits the whole thread group. In that case we're
1551 still attached, and must reap the lwp. */
1552 if (save_errno
== ESRCH
)
1556 ret
= my_waitpid (lwpid
, &status
, __WALL
);
1559 warning (_("Couldn't reap LWP %d while detaching: %s"),
1560 lwpid
, strerror (errno
));
1562 else if (!WIFEXITED (status
) && !WIFSIGNALED (status
))
1564 warning (_("Reaping LWP %d while detaching "
1565 "returned unexpected status 0x%x"),
1571 error (_("Can't detach %s: %s"),
1572 target_pid_to_str (ptid_of (thread
)),
1573 strerror (save_errno
));
1576 else if (debug_threads
)
1578 debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n",
1579 target_pid_to_str (ptid_of (thread
)),
1586 /* Callback for find_inferior. Detaches from non-leader threads of a
1590 linux_detach_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1592 struct thread_info
*thread
= (struct thread_info
*) entry
;
1593 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1594 int pid
= *(int *) args
;
1595 int lwpid
= lwpid_of (thread
);
1597 /* Skip other processes. */
1598 if (ptid_get_pid (entry
->id
) != pid
)
1601 /* We don't actually detach from the thread group leader just yet.
1602 If the thread group exits, we must reap the zombie clone lwps
1603 before we're able to reap the leader. */
1604 if (ptid_get_pid (entry
->id
) == lwpid
)
1607 linux_detach_one_lwp (lwp
);
1612 linux_detach (int pid
)
1614 struct process_info
*process
;
1615 struct lwp_info
*main_lwp
;
1617 process
= find_process_pid (pid
);
1618 if (process
== NULL
)
1621 /* As there's a step over already in progress, let it finish first,
1622 otherwise nesting a stabilize_threads operation on top gets real
1624 complete_ongoing_step_over ();
1626 /* Stop all threads before detaching. First, ptrace requires that
1627 the thread is stopped to sucessfully detach. Second, thread_db
1628 may need to uninstall thread event breakpoints from memory, which
1629 only works with a stopped process anyway. */
1630 stop_all_lwps (0, NULL
);
1632 #ifdef USE_THREAD_DB
1633 thread_db_detach (process
);
1636 /* Stabilize threads (move out of jump pads). */
1637 stabilize_threads ();
1639 /* Detach from the clone lwps first. If the thread group exits just
1640 while we're detaching, we must reap the clone lwps before we're
1641 able to reap the leader. */
1642 find_inferior (&all_threads
, linux_detach_lwp_callback
, &pid
);
1644 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1645 linux_detach_one_lwp (main_lwp
);
1647 the_target
->mourn (process
);
1649 /* Since we presently can only stop all lwps of all processes, we
1650 need to unstop lwps of other processes. */
1651 unstop_all_lwps (0, NULL
);
1655 /* Remove all LWPs that belong to process PROC from the lwp list. */
1658 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1660 struct thread_info
*thread
= (struct thread_info
*) entry
;
1661 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1662 struct process_info
*process
= (struct process_info
*) proc
;
1664 if (pid_of (thread
) == pid_of (process
))
1671 linux_mourn (struct process_info
*process
)
1673 struct process_info_private
*priv
;
1675 #ifdef USE_THREAD_DB
1676 thread_db_mourn (process
);
1679 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1681 /* Freeing all private data. */
1682 priv
= process
->priv
;
1683 free (priv
->arch_private
);
1685 process
->priv
= NULL
;
1687 remove_process (process
);
1691 linux_join (int pid
)
1696 ret
= my_waitpid (pid
, &status
, 0);
1697 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1699 } while (ret
!= -1 || errno
!= ECHILD
);
1702 /* Return nonzero if the given thread is still alive. */
1704 linux_thread_alive (ptid_t ptid
)
1706 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1708 /* We assume we always know if a thread exits. If a whole process
1709 exited but we still haven't been able to report it to GDB, we'll
1710 hold on to the last lwp of the dead process. */
1712 return !lwp_is_marked_dead (lwp
);
1717 /* Return 1 if this lwp still has an interesting status pending. If
1718 not (e.g., it had stopped for a breakpoint that is gone), return
1722 thread_still_has_status_pending_p (struct thread_info
*thread
)
1724 struct lwp_info
*lp
= get_thread_lwp (thread
);
1726 if (!lp
->status_pending_p
)
1729 if (thread
->last_resume_kind
!= resume_stop
1730 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1731 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1733 struct thread_info
*saved_thread
;
1737 gdb_assert (lp
->last_status
!= 0);
1741 saved_thread
= current_thread
;
1742 current_thread
= thread
;
1744 if (pc
!= lp
->stop_pc
)
1747 debug_printf ("PC of %ld changed\n",
1752 #if !USE_SIGTRAP_SIGINFO
1753 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1754 && !(*the_low_target
.breakpoint_at
) (pc
))
1757 debug_printf ("previous SW breakpoint of %ld gone\n",
1761 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1762 && !hardware_breakpoint_inserted_here (pc
))
1765 debug_printf ("previous HW breakpoint of %ld gone\n",
1771 current_thread
= saved_thread
;
1776 debug_printf ("discarding pending breakpoint status\n");
1777 lp
->status_pending_p
= 0;
1785 /* Returns true if LWP is resumed from the client's perspective. */
1788 lwp_resumed (struct lwp_info
*lwp
)
1790 struct thread_info
*thread
= get_lwp_thread (lwp
);
1792 if (thread
->last_resume_kind
!= resume_stop
)
1795 /* Did gdb send us a `vCont;t', but we haven't reported the
1796 corresponding stop to gdb yet? If so, the thread is still
1797 resumed/running from gdb's perspective. */
1798 if (thread
->last_resume_kind
== resume_stop
1799 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1805 /* Return 1 if this lwp has an interesting status pending. */
1807 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1809 struct thread_info
*thread
= (struct thread_info
*) entry
;
1810 struct lwp_info
*lp
= get_thread_lwp (thread
);
1811 ptid_t ptid
= * (ptid_t
*) arg
;
1813 /* Check if we're only interested in events from a specific process
1814 or a specific LWP. */
1815 if (!ptid_match (ptid_of (thread
), ptid
))
1818 if (!lwp_resumed (lp
))
1821 if (lp
->status_pending_p
1822 && !thread_still_has_status_pending_p (thread
))
1824 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1828 return lp
->status_pending_p
;
1832 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1834 ptid_t ptid
= *(ptid_t
*) data
;
1837 if (ptid_get_lwp (ptid
) != 0)
1838 lwp
= ptid_get_lwp (ptid
);
1840 lwp
= ptid_get_pid (ptid
);
1842 if (ptid_get_lwp (entry
->id
) == lwp
)
1849 find_lwp_pid (ptid_t ptid
)
1851 struct inferior_list_entry
*thread
1852 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1857 return get_thread_lwp ((struct thread_info
*) thread
);
1860 /* Return the number of known LWPs in the tgid given by PID. */
1865 struct inferior_list_entry
*inf
, *tmp
;
1868 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1870 if (ptid_get_pid (inf
->id
) == pid
)
1877 /* The arguments passed to iterate_over_lwps. */
1879 struct iterate_over_lwps_args
1881 /* The FILTER argument passed to iterate_over_lwps. */
1884 /* The CALLBACK argument passed to iterate_over_lwps. */
1885 iterate_over_lwps_ftype
*callback
;
1887 /* The DATA argument passed to iterate_over_lwps. */
1891 /* Callback for find_inferior used by iterate_over_lwps to filter
1892 calls to the callback supplied to that function. Returning a
1893 nonzero value causes find_inferiors to stop iterating and return
1894 the current inferior_list_entry. Returning zero indicates that
1895 find_inferiors should continue iterating. */
1898 iterate_over_lwps_filter (struct inferior_list_entry
*entry
, void *args_p
)
1900 struct iterate_over_lwps_args
*args
1901 = (struct iterate_over_lwps_args
*) args_p
;
1903 if (ptid_match (entry
->id
, args
->filter
))
1905 struct thread_info
*thr
= (struct thread_info
*) entry
;
1906 struct lwp_info
*lwp
= get_thread_lwp (thr
);
1908 return (*args
->callback
) (lwp
, args
->data
);
1914 /* See nat/linux-nat.h. */
1917 iterate_over_lwps (ptid_t filter
,
1918 iterate_over_lwps_ftype callback
,
1921 struct iterate_over_lwps_args args
= {filter
, callback
, data
};
1922 struct inferior_list_entry
*entry
;
1924 entry
= find_inferior (&all_threads
, iterate_over_lwps_filter
, &args
);
1928 return get_thread_lwp ((struct thread_info
*) entry
);
1931 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1932 their exits until all other threads in the group have exited. */
1935 check_zombie_leaders (void)
1937 struct process_info
*proc
, *tmp
;
1939 ALL_PROCESSES (proc
, tmp
)
1941 pid_t leader_pid
= pid_of (proc
);
1942 struct lwp_info
*leader_lp
;
1944 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1947 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1948 "num_lwps=%d, zombie=%d\n",
1949 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1950 linux_proc_pid_is_zombie (leader_pid
));
1952 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1953 /* Check if there are other threads in the group, as we may
1954 have raced with the inferior simply exiting. */
1955 && !last_thread_of_process_p (leader_pid
)
1956 && linux_proc_pid_is_zombie (leader_pid
))
1958 /* A leader zombie can mean one of two things:
1960 - It exited, and there's an exit status pending
1961 available, or only the leader exited (not the whole
1962 program). In the latter case, we can't waitpid the
1963 leader's exit status until all other threads are gone.
1965 - There are 3 or more threads in the group, and a thread
1966 other than the leader exec'd. On an exec, the Linux
1967 kernel destroys all other threads (except the execing
1968 one) in the thread group, and resets the execing thread's
1969 tid to the tgid. No exit notification is sent for the
1970 execing thread -- from the ptracer's perspective, it
1971 appears as though the execing thread just vanishes.
1972 Until we reap all other threads except the leader and the
1973 execing thread, the leader will be zombie, and the
1974 execing thread will be in `D (disc sleep)'. As soon as
1975 all other threads are reaped, the execing thread changes
1976 it's tid to the tgid, and the previous (zombie) leader
1977 vanishes, giving place to the "new" leader. We could try
1978 distinguishing the exit and exec cases, by waiting once
1979 more, and seeing if something comes out, but it doesn't
1980 sound useful. The previous leader _does_ go away, and
1981 we'll re-add the new one once we see the exec event
1982 (which is just the same as what would happen if the
1983 previous leader did exit voluntarily before some other
1987 debug_printf ("CZL: Thread group leader %d zombie "
1988 "(it exited, or another thread execd).\n",
1991 delete_lwp (leader_lp
);
1996 /* Callback for `find_inferior'. Returns the first LWP that is not
1997 stopped. ARG is a PTID filter. */
2000 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
2002 struct thread_info
*thr
= (struct thread_info
*) entry
;
2003 struct lwp_info
*lwp
;
2004 ptid_t filter
= *(ptid_t
*) arg
;
2006 if (!ptid_match (ptid_of (thr
), filter
))
2009 lwp
= get_thread_lwp (thr
);
2016 /* Increment LWP's suspend count. */
2019 lwp_suspended_inc (struct lwp_info
*lwp
)
2023 if (debug_threads
&& lwp
->suspended
> 4)
2025 struct thread_info
*thread
= get_lwp_thread (lwp
);
2027 debug_printf ("LWP %ld has a suspiciously high suspend count,"
2028 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
2032 /* Decrement LWP's suspend count. */
2035 lwp_suspended_decr (struct lwp_info
*lwp
)
2039 if (lwp
->suspended
< 0)
2041 struct thread_info
*thread
= get_lwp_thread (lwp
);
2043 internal_error (__FILE__
, __LINE__
,
2044 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
2049 /* This function should only be called if the LWP got a SIGTRAP.
2051 Handle any tracepoint steps or hits. Return true if a tracepoint
2052 event was handled, 0 otherwise. */
2055 handle_tracepoints (struct lwp_info
*lwp
)
2057 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
2058 int tpoint_related_event
= 0;
2060 gdb_assert (lwp
->suspended
== 0);
2062 /* If this tracepoint hit causes a tracing stop, we'll immediately
2063 uninsert tracepoints. To do this, we temporarily pause all
2064 threads, unpatch away, and then unpause threads. We need to make
2065 sure the unpausing doesn't resume LWP too. */
2066 lwp_suspended_inc (lwp
);
2068 /* And we need to be sure that any all-threads-stopping doesn't try
2069 to move threads out of the jump pads, as it could deadlock the
2070 inferior (LWP could be in the jump pad, maybe even holding the
2073 /* Do any necessary step collect actions. */
2074 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2076 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2078 /* See if we just hit a tracepoint and do its main collect
2080 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2082 lwp_suspended_decr (lwp
);
2084 gdb_assert (lwp
->suspended
== 0);
2085 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
2087 if (tpoint_related_event
)
2090 debug_printf ("got a tracepoint event\n");
2097 /* Convenience wrapper. Returns true if LWP is presently collecting a
2101 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2102 struct fast_tpoint_collect_status
*status
)
2104 CORE_ADDR thread_area
;
2105 struct thread_info
*thread
= get_lwp_thread (lwp
);
2107 if (the_low_target
.get_thread_area
== NULL
)
2110 /* Get the thread area address. This is used to recognize which
2111 thread is which when tracing with the in-process agent library.
2112 We don't read anything from the address, and treat it as opaque;
2113 it's the address itself that we assume is unique per-thread. */
2114 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2117 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2120 /* The reason we resume in the caller, is because we want to be able
2121 to pass lwp->status_pending as WSTAT, and we need to clear
2122 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2123 refuses to resume. */
2126 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2128 struct thread_info
*saved_thread
;
2130 saved_thread
= current_thread
;
2131 current_thread
= get_lwp_thread (lwp
);
2134 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2135 && supports_fast_tracepoints ()
2136 && agent_loaded_p ())
2138 struct fast_tpoint_collect_status status
;
2142 debug_printf ("Checking whether LWP %ld needs to move out of the "
2144 lwpid_of (current_thread
));
2146 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
2149 || (WSTOPSIG (*wstat
) != SIGILL
2150 && WSTOPSIG (*wstat
) != SIGFPE
2151 && WSTOPSIG (*wstat
) != SIGSEGV
2152 && WSTOPSIG (*wstat
) != SIGBUS
))
2154 lwp
->collecting_fast_tracepoint
= r
;
2158 if (r
== 1 && 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
= 0;
2187 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2188 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2191 struct regcache
*regcache
;
2193 /* The si_addr on a few signals references the address
2194 of the faulting instruction. Adjust that as
2196 if ((WSTOPSIG (*wstat
) == SIGILL
2197 || WSTOPSIG (*wstat
) == SIGFPE
2198 || WSTOPSIG (*wstat
) == SIGBUS
2199 || WSTOPSIG (*wstat
) == SIGSEGV
)
2200 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2201 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2202 /* Final check just to make sure we don't clobber
2203 the siginfo of non-kernel-sent signals. */
2204 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2206 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2207 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2208 (PTRACE_TYPE_ARG3
) 0, &info
);
2211 regcache
= get_thread_regcache (current_thread
, 1);
2212 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2213 lwp
->stop_pc
= status
.tpoint_addr
;
2215 /* Cancel any fast tracepoint lock this thread was
2217 force_unlock_trace_buffer ();
2220 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2223 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2224 "stopping all threads momentarily.\n");
2226 stop_all_lwps (1, lwp
);
2228 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2229 lwp
->exit_jump_pad_bkpt
= NULL
;
2231 unstop_all_lwps (1, lwp
);
2233 gdb_assert (lwp
->suspended
>= 0);
2239 debug_printf ("Checking whether LWP %ld needs to move out of the "
2241 lwpid_of (current_thread
));
2243 current_thread
= saved_thread
;
2247 /* Enqueue one signal in the "signals to report later when out of the
2251 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2253 struct pending_signals
*p_sig
;
2254 struct thread_info
*thread
= get_lwp_thread (lwp
);
2257 debug_printf ("Deferring signal %d for LWP %ld.\n",
2258 WSTOPSIG (*wstat
), lwpid_of (thread
));
2262 struct pending_signals
*sig
;
2264 for (sig
= lwp
->pending_signals_to_report
;
2267 debug_printf (" Already queued %d\n",
2270 debug_printf (" (no more currently queued signals)\n");
2273 /* Don't enqueue non-RT signals if they are already in the deferred
2274 queue. (SIGSTOP being the easiest signal to see ending up here
2276 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2278 struct pending_signals
*sig
;
2280 for (sig
= lwp
->pending_signals_to_report
;
2284 if (sig
->signal
== WSTOPSIG (*wstat
))
2287 debug_printf ("Not requeuing already queued non-RT signal %d"
2296 p_sig
= XCNEW (struct pending_signals
);
2297 p_sig
->prev
= lwp
->pending_signals_to_report
;
2298 p_sig
->signal
= WSTOPSIG (*wstat
);
2300 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2303 lwp
->pending_signals_to_report
= p_sig
;
2306 /* Dequeue one signal from the "signals to report later when out of
2307 the jump pad" list. */
2310 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2312 struct thread_info
*thread
= get_lwp_thread (lwp
);
2314 if (lwp
->pending_signals_to_report
!= NULL
)
2316 struct pending_signals
**p_sig
;
2318 p_sig
= &lwp
->pending_signals_to_report
;
2319 while ((*p_sig
)->prev
!= NULL
)
2320 p_sig
= &(*p_sig
)->prev
;
2322 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2323 if ((*p_sig
)->info
.si_signo
!= 0)
2324 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2330 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2331 WSTOPSIG (*wstat
), lwpid_of (thread
));
2335 struct pending_signals
*sig
;
2337 for (sig
= lwp
->pending_signals_to_report
;
2340 debug_printf (" Still queued %d\n",
2343 debug_printf (" (no more queued signals)\n");
2352 /* Fetch the possibly triggered data watchpoint info and store it in
2355 On some archs, like x86, that use debug registers to set
2356 watchpoints, it's possible that the way to know which watched
2357 address trapped, is to check the register that is used to select
2358 which address to watch. Problem is, between setting the watchpoint
2359 and reading back which data address trapped, the user may change
2360 the set of watchpoints, and, as a consequence, GDB changes the
2361 debug registers in the inferior. To avoid reading back a stale
2362 stopped-data-address when that happens, we cache in LP the fact
2363 that a watchpoint trapped, and the corresponding data address, as
2364 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2365 registers meanwhile, we have the cached data we can rely on. */
2368 check_stopped_by_watchpoint (struct lwp_info
*child
)
2370 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2372 struct thread_info
*saved_thread
;
2374 saved_thread
= current_thread
;
2375 current_thread
= get_lwp_thread (child
);
2377 if (the_low_target
.stopped_by_watchpoint ())
2379 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2381 if (the_low_target
.stopped_data_address
!= NULL
)
2382 child
->stopped_data_address
2383 = the_low_target
.stopped_data_address ();
2385 child
->stopped_data_address
= 0;
2388 current_thread
= saved_thread
;
2391 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2394 /* Return the ptrace options that we want to try to enable. */
2397 linux_low_ptrace_options (int attached
)
2402 options
|= PTRACE_O_EXITKILL
;
2404 if (report_fork_events
)
2405 options
|= PTRACE_O_TRACEFORK
;
2407 if (report_vfork_events
)
2408 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2410 if (report_exec_events
)
2411 options
|= PTRACE_O_TRACEEXEC
;
2413 options
|= PTRACE_O_TRACESYSGOOD
;
2418 /* Do low-level handling of the event, and check if we should go on
2419 and pass it to caller code. Return the affected lwp if we are, or
2422 static struct lwp_info
*
2423 linux_low_filter_event (int lwpid
, int wstat
)
2425 struct lwp_info
*child
;
2426 struct thread_info
*thread
;
2427 int have_stop_pc
= 0;
2429 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2431 /* Check for stop events reported by a process we didn't already
2432 know about - anything not already in our LWP list.
2434 If we're expecting to receive stopped processes after
2435 fork, vfork, and clone events, then we'll just add the
2436 new one to our list and go back to waiting for the event
2437 to be reported - the stopped process might be returned
2438 from waitpid before or after the event is.
2440 But note the case of a non-leader thread exec'ing after the
2441 leader having exited, and gone from our lists (because
2442 check_zombie_leaders deleted it). The non-leader thread
2443 changes its tid to the tgid. */
2445 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2446 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2450 /* A multi-thread exec after we had seen the leader exiting. */
2453 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2454 "after exec.\n", lwpid
);
2457 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2458 child
= add_lwp (child_ptid
);
2460 current_thread
= child
->thread
;
2463 /* If we didn't find a process, one of two things presumably happened:
2464 - A process we started and then detached from has exited. Ignore it.
2465 - A process we are controlling has forked and the new child's stop
2466 was reported to us by the kernel. Save its PID. */
2467 if (child
== NULL
&& WIFSTOPPED (wstat
))
2469 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2472 else if (child
== NULL
)
2475 thread
= get_lwp_thread (child
);
2479 child
->last_status
= wstat
;
2481 /* Check if the thread has exited. */
2482 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2485 debug_printf ("LLFE: %d exited.\n", lwpid
);
2487 if (finish_step_over (child
))
2489 /* Unsuspend all other LWPs, and set them back running again. */
2490 unsuspend_all_lwps (child
);
2493 /* If there is at least one more LWP, then the exit signal was
2494 not the end of the debugged application and should be
2495 ignored, unless GDB wants to hear about thread exits. */
2496 if (report_thread_events
2497 || last_thread_of_process_p (pid_of (thread
)))
2499 /* Since events are serialized to GDB core, and we can't
2500 report this one right now. Leave the status pending for
2501 the next time we're able to report it. */
2502 mark_lwp_dead (child
, wstat
);
2512 gdb_assert (WIFSTOPPED (wstat
));
2514 if (WIFSTOPPED (wstat
))
2516 struct process_info
*proc
;
2518 /* Architecture-specific setup after inferior is running. */
2519 proc
= find_process_pid (pid_of (thread
));
2520 if (proc
->tdesc
== NULL
)
2524 /* This needs to happen after we have attached to the
2525 inferior and it is stopped for the first time, but
2526 before we access any inferior registers. */
2527 linux_arch_setup_thread (thread
);
2531 /* The process is started, but GDBserver will do
2532 architecture-specific setup after the program stops at
2533 the first instruction. */
2534 child
->status_pending_p
= 1;
2535 child
->status_pending
= wstat
;
2541 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2543 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2544 int options
= linux_low_ptrace_options (proc
->attached
);
2546 linux_enable_event_reporting (lwpid
, options
);
2547 child
->must_set_ptrace_flags
= 0;
2550 /* Always update syscall_state, even if it will be filtered later. */
2551 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2553 child
->syscall_state
2554 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2555 ? TARGET_WAITKIND_SYSCALL_RETURN
2556 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2560 /* Almost all other ptrace-stops are known to be outside of system
2561 calls, with further exceptions in handle_extended_wait. */
2562 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2565 /* Be careful to not overwrite stop_pc until save_stop_reason is
2567 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2568 && linux_is_extended_waitstatus (wstat
))
2570 child
->stop_pc
= get_pc (child
);
2571 if (handle_extended_wait (&child
, wstat
))
2573 /* The event has been handled, so just return without
2579 if (linux_wstatus_maybe_breakpoint (wstat
))
2581 if (save_stop_reason (child
))
2586 child
->stop_pc
= get_pc (child
);
2588 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2589 && child
->stop_expected
)
2592 debug_printf ("Expected stop.\n");
2593 child
->stop_expected
= 0;
2595 if (thread
->last_resume_kind
== resume_stop
)
2597 /* We want to report the stop to the core. Treat the
2598 SIGSTOP as a normal event. */
2600 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2601 target_pid_to_str (ptid_of (thread
)));
2603 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2605 /* Stopping threads. We don't want this SIGSTOP to end up
2608 debug_printf ("LLW: SIGSTOP caught for %s "
2609 "while stopping threads.\n",
2610 target_pid_to_str (ptid_of (thread
)));
2615 /* This is a delayed SIGSTOP. Filter out the event. */
2617 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2618 child
->stepping
? "step" : "continue",
2619 target_pid_to_str (ptid_of (thread
)));
2621 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2626 child
->status_pending_p
= 1;
2627 child
->status_pending
= wstat
;
2631 /* Return true if THREAD is doing hardware single step. */
2634 maybe_hw_step (struct thread_info
*thread
)
2636 if (can_hardware_single_step ())
2640 /* GDBserver must insert single-step breakpoint for software
2642 gdb_assert (has_single_step_breakpoints (thread
));
2647 /* Resume LWPs that are currently stopped without any pending status
2648 to report, but are resumed from the core's perspective. */
2651 resume_stopped_resumed_lwps (struct inferior_list_entry
*entry
)
2653 struct thread_info
*thread
= (struct thread_info
*) entry
;
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
)
2720 enqueue_one_deferred_signal (requested_child
,
2721 &requested_child
->status_pending
);
2722 requested_child
->status_pending_p
= 0;
2723 requested_child
->status_pending
= 0;
2724 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2727 if (requested_child
->suspended
2728 && requested_child
->status_pending_p
)
2730 internal_error (__FILE__
, __LINE__
,
2731 "requesting an event out of a"
2732 " suspended child?");
2735 if (requested_child
->status_pending_p
)
2737 event_child
= requested_child
;
2738 event_thread
= get_lwp_thread (event_child
);
2742 if (event_child
!= NULL
)
2745 debug_printf ("Got an event from pending child %ld (%04x)\n",
2746 lwpid_of (event_thread
), event_child
->status_pending
);
2747 *wstatp
= event_child
->status_pending
;
2748 event_child
->status_pending_p
= 0;
2749 event_child
->status_pending
= 0;
2750 current_thread
= event_thread
;
2751 return lwpid_of (event_thread
);
2754 /* But if we don't find a pending event, we'll have to wait.
2756 We only enter this loop if no process has a pending wait status.
2757 Thus any action taken in response to a wait status inside this
2758 loop is responding as soon as we detect the status, not after any
2761 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2762 all signals while here. */
2763 sigfillset (&block_mask
);
2764 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2766 /* Always pull all events out of the kernel. We'll randomly select
2767 an event LWP out of all that have events, to prevent
2769 while (event_child
== NULL
)
2773 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2776 - If the thread group leader exits while other threads in the
2777 thread group still exist, waitpid(TGID, ...) hangs. That
2778 waitpid won't return an exit status until the other threads
2779 in the group are reaped.
2781 - When a non-leader thread execs, that thread just vanishes
2782 without reporting an exit (so we'd hang if we waited for it
2783 explicitly in that case). The exec event is reported to
2786 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2789 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2790 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2796 debug_printf ("LLW: waitpid %ld received %s\n",
2797 (long) ret
, status_to_str (*wstatp
));
2800 /* Filter all events. IOW, leave all events pending. We'll
2801 randomly select an event LWP out of all that have events
2803 linux_low_filter_event (ret
, *wstatp
);
2804 /* Retry until nothing comes out of waitpid. A single
2805 SIGCHLD can indicate more than one child stopped. */
2809 /* Now that we've pulled all events out of the kernel, resume
2810 LWPs that don't have an interesting event to report. */
2811 if (stopping_threads
== NOT_STOPPING_THREADS
)
2812 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2814 /* ... and find an LWP with a status to report to the core, if
2816 event_thread
= (struct thread_info
*)
2817 find_inferior_in_random (&all_threads
, status_pending_p_callback
,
2819 if (event_thread
!= NULL
)
2821 event_child
= get_thread_lwp (event_thread
);
2822 *wstatp
= event_child
->status_pending
;
2823 event_child
->status_pending_p
= 0;
2824 event_child
->status_pending
= 0;
2828 /* Check for zombie thread group leaders. Those can't be reaped
2829 until all other threads in the thread group are. */
2830 check_zombie_leaders ();
2832 /* If there are no resumed children left in the set of LWPs we
2833 want to wait for, bail. We can't just block in
2834 waitpid/sigsuspend, because lwps might have been left stopped
2835 in trace-stop state, and we'd be stuck forever waiting for
2836 their status to change (which would only happen if we resumed
2837 them). Even if WNOHANG is set, this return code is preferred
2838 over 0 (below), as it is more detailed. */
2839 if ((find_inferior (&all_threads
,
2840 not_stopped_callback
,
2841 &wait_ptid
) == NULL
))
2844 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2845 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2849 /* No interesting event to report to the caller. */
2850 if ((options
& WNOHANG
))
2853 debug_printf ("WNOHANG set, no event found\n");
2855 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2859 /* Block until we get an event reported with SIGCHLD. */
2861 debug_printf ("sigsuspend'ing\n");
2863 sigsuspend (&prev_mask
);
2864 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2868 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2870 current_thread
= event_thread
;
2872 return lwpid_of (event_thread
);
2875 /* Wait for an event from child(ren) PTID. PTIDs can be:
2876 minus_one_ptid, to specify any child; a pid PTID, specifying all
2877 lwps of a thread group; or a PTID representing a single lwp. Store
2878 the stop status through the status pointer WSTAT. OPTIONS is
2879 passed to the waitpid call. Return 0 if no event was found and
2880 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2881 was found. Return the PID of the stopped child otherwise. */
2884 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2886 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2889 /* Count the LWP's that have had events. */
2892 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2894 struct thread_info
*thread
= (struct thread_info
*) entry
;
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 (struct inferior_list_entry
*entry
, void *data
)
2913 struct thread_info
*thread
= (struct thread_info
*) entry
;
2914 struct lwp_info
*lp
= get_thread_lwp (thread
);
2916 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2917 && thread
->last_resume_kind
== resume_step
2918 && lp
->status_pending_p
)
2924 /* Select the Nth LWP that has had an event. */
2927 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2929 struct thread_info
*thread
= (struct thread_info
*) entry
;
2930 struct lwp_info
*lp
= get_thread_lwp (thread
);
2931 int *selector
= (int *) data
;
2933 gdb_assert (selector
!= NULL
);
2935 /* Select only resumed LWPs that have an event pending. */
2936 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2937 && lp
->status_pending_p
)
2938 if ((*selector
)-- == 0)
2944 /* Select one LWP out of those that have events pending. */
2947 select_event_lwp (struct lwp_info
**orig_lp
)
2950 int random_selector
;
2951 struct thread_info
*event_thread
= NULL
;
2953 /* In all-stop, give preference to the LWP that is being
2954 single-stepped. There will be at most one, and it's the LWP that
2955 the core is most interested in. If we didn't do this, then we'd
2956 have to handle pending step SIGTRAPs somehow in case the core
2957 later continues the previously-stepped thread, otherwise we'd
2958 report the pending SIGTRAP, and the core, not having stepped the
2959 thread, wouldn't understand what the trap was for, and therefore
2960 would report it to the user as a random signal. */
2964 = (struct thread_info
*) find_inferior (&all_threads
,
2965 select_singlestep_lwp_callback
,
2967 if (event_thread
!= NULL
)
2970 debug_printf ("SEL: Select single-step %s\n",
2971 target_pid_to_str (ptid_of (event_thread
)));
2974 if (event_thread
== NULL
)
2976 /* No single-stepping LWP. Select one at random, out of those
2977 which have had events. */
2979 /* First see how many events we have. */
2980 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2981 gdb_assert (num_events
> 0);
2983 /* Now randomly pick a LWP out of those that have had
2985 random_selector
= (int)
2986 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2988 if (debug_threads
&& num_events
> 1)
2989 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2990 num_events
, random_selector
);
2993 = (struct thread_info
*) find_inferior (&all_threads
,
2994 select_event_lwp_callback
,
2998 if (event_thread
!= NULL
)
3000 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
3002 /* Switch the event LWP. */
3003 *orig_lp
= event_lp
;
3007 /* Decrement the suspend count of an LWP. */
3010 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
3012 struct thread_info
*thread
= (struct thread_info
*) entry
;
3013 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3015 /* Ignore EXCEPT. */
3019 lwp_suspended_decr (lwp
);
3023 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
3027 unsuspend_all_lwps (struct lwp_info
*except
)
3029 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
3032 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
3033 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
3035 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
3036 static ptid_t
linux_wait_1 (ptid_t ptid
,
3037 struct target_waitstatus
*ourstatus
,
3038 int target_options
);
3040 /* Stabilize threads (move out of jump pads).
3042 If a thread is midway collecting a fast tracepoint, we need to
3043 finish the collection and move it out of the jump pad before
3044 reporting the signal.
3046 This avoids recursion while collecting (when a signal arrives
3047 midway, and the signal handler itself collects), which would trash
3048 the trace buffer. In case the user set a breakpoint in a signal
3049 handler, this avoids the backtrace showing the jump pad, etc..
3050 Most importantly, there are certain things we can't do safely if
3051 threads are stopped in a jump pad (or in its callee's). For
3054 - starting a new trace run. A thread still collecting the
3055 previous run, could trash the trace buffer when resumed. The trace
3056 buffer control structures would have been reset but the thread had
3057 no way to tell. The thread could even midway memcpy'ing to the
3058 buffer, which would mean that when resumed, it would clobber the
3059 trace buffer that had been set for a new run.
3061 - we can't rewrite/reuse the jump pads for new tracepoints
3062 safely. Say you do tstart while a thread is stopped midway while
3063 collecting. When the thread is later resumed, it finishes the
3064 collection, and returns to the jump pad, to execute the original
3065 instruction that was under the tracepoint jump at the time the
3066 older run had been started. If the jump pad had been rewritten
3067 since for something else in the new run, the thread would now
3068 execute the wrong / random instructions. */
3071 linux_stabilize_threads (void)
3073 struct thread_info
*saved_thread
;
3074 struct thread_info
*thread_stuck
;
3077 = (struct thread_info
*) find_inferior (&all_threads
,
3078 stuck_in_jump_pad_callback
,
3080 if (thread_stuck
!= NULL
)
3083 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
3084 lwpid_of (thread_stuck
));
3088 saved_thread
= current_thread
;
3090 stabilizing_threads
= 1;
3093 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
3095 /* Loop until all are stopped out of the jump pads. */
3096 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
3098 struct target_waitstatus ourstatus
;
3099 struct lwp_info
*lwp
;
3102 /* Note that we go through the full wait even loop. While
3103 moving threads out of jump pad, we need to be able to step
3104 over internal breakpoints and such. */
3105 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
3107 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
3109 lwp
= get_thread_lwp (current_thread
);
3112 lwp_suspended_inc (lwp
);
3114 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3115 || current_thread
->last_resume_kind
== resume_stop
)
3117 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3118 enqueue_one_deferred_signal (lwp
, &wstat
);
3123 unsuspend_all_lwps (NULL
);
3125 stabilizing_threads
= 0;
3127 current_thread
= saved_thread
;
3132 = (struct thread_info
*) find_inferior (&all_threads
,
3133 stuck_in_jump_pad_callback
,
3135 if (thread_stuck
!= NULL
)
3136 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3137 lwpid_of (thread_stuck
));
3141 /* Convenience function that is called when the kernel reports an
3142 event that is not passed out to GDB. */
3145 ignore_event (struct target_waitstatus
*ourstatus
)
3147 /* If we got an event, there may still be others, as a single
3148 SIGCHLD can indicate more than one child stopped. This forces
3149 another target_wait call. */
3152 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3156 /* Convenience function that is called when the kernel reports an exit
3157 event. This decides whether to report the event to GDB as a
3158 process exit event, a thread exit event, or to suppress the
3162 filter_exit_event (struct lwp_info
*event_child
,
3163 struct target_waitstatus
*ourstatus
)
3165 struct thread_info
*thread
= get_lwp_thread (event_child
);
3166 ptid_t ptid
= ptid_of (thread
);
3168 if (!last_thread_of_process_p (pid_of (thread
)))
3170 if (report_thread_events
)
3171 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3173 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3175 delete_lwp (event_child
);
3180 /* Returns 1 if GDB is interested in any event_child syscalls. */
3183 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3185 struct thread_info
*thread
= get_lwp_thread (event_child
);
3186 struct process_info
*proc
= get_thread_process (thread
);
3188 return !VEC_empty (int, proc
->syscalls_to_catch
);
3191 /* Returns 1 if GDB is interested in the event_child syscall.
3192 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3195 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3199 struct thread_info
*thread
= get_lwp_thread (event_child
);
3200 struct process_info
*proc
= get_thread_process (thread
);
3202 if (VEC_empty (int, proc
->syscalls_to_catch
))
3205 if (VEC_index (int, proc
->syscalls_to_catch
, 0) == ANY_SYSCALL
)
3208 get_syscall_trapinfo (event_child
, &sysno
);
3210 VEC_iterate (int, proc
->syscalls_to_catch
, i
, iter
);
3218 /* Wait for process, returns status. */
3221 linux_wait_1 (ptid_t ptid
,
3222 struct target_waitstatus
*ourstatus
, int target_options
)
3225 struct lwp_info
*event_child
;
3228 int step_over_finished
;
3229 int bp_explains_trap
;
3230 int maybe_internal_trap
;
3239 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3242 /* Translate generic target options into linux options. */
3244 if (target_options
& TARGET_WNOHANG
)
3247 bp_explains_trap
= 0;
3250 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3252 /* Find a resumed LWP, if any. */
3253 if (find_inferior (&all_threads
,
3254 status_pending_p_callback
,
3255 &minus_one_ptid
) != NULL
)
3257 else if ((find_inferior (&all_threads
,
3258 not_stopped_callback
,
3259 &minus_one_ptid
) != NULL
))
3264 if (ptid_equal (step_over_bkpt
, null_ptid
))
3265 pid
= linux_wait_for_event (ptid
, &w
, options
);
3269 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3270 target_pid_to_str (step_over_bkpt
));
3271 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3274 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3276 gdb_assert (target_options
& TARGET_WNOHANG
);
3280 debug_printf ("linux_wait_1 ret = null_ptid, "
3281 "TARGET_WAITKIND_IGNORE\n");
3285 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3292 debug_printf ("linux_wait_1 ret = null_ptid, "
3293 "TARGET_WAITKIND_NO_RESUMED\n");
3297 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3301 event_child
= get_thread_lwp (current_thread
);
3303 /* linux_wait_for_event only returns an exit status for the last
3304 child of a process. Report it. */
3305 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3309 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3310 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3314 debug_printf ("linux_wait_1 ret = %s, exited with "
3316 target_pid_to_str (ptid_of (current_thread
)),
3323 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3324 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3328 debug_printf ("linux_wait_1 ret = %s, terminated with "
3330 target_pid_to_str (ptid_of (current_thread
)),
3336 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3337 return filter_exit_event (event_child
, ourstatus
);
3339 return ptid_of (current_thread
);
3342 /* If step-over executes a breakpoint instruction, in the case of a
3343 hardware single step it means a gdb/gdbserver breakpoint had been
3344 planted on top of a permanent breakpoint, in the case of a software
3345 single step it may just mean that gdbserver hit the reinsert breakpoint.
3346 The PC has been adjusted by save_stop_reason to point at
3347 the breakpoint address.
3348 So in the case of the hardware single step advance the PC manually
3349 past the breakpoint and in the case of software single step advance only
3350 if it's not the single_step_breakpoint we are hitting.
3351 This avoids that a program would keep trapping a permanent breakpoint
3353 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3354 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3355 && (event_child
->stepping
3356 || !single_step_breakpoint_inserted_here (event_child
->stop_pc
)))
3358 int increment_pc
= 0;
3359 int breakpoint_kind
= 0;
3360 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3363 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3364 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3368 debug_printf ("step-over for %s executed software breakpoint\n",
3369 target_pid_to_str (ptid_of (current_thread
)));
3372 if (increment_pc
!= 0)
3374 struct regcache
*regcache
3375 = get_thread_regcache (current_thread
, 1);
3377 event_child
->stop_pc
+= increment_pc
;
3378 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3380 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3381 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3385 /* If this event was not handled before, and is not a SIGTRAP, we
3386 report it. SIGILL and SIGSEGV are also treated as traps in case
3387 a breakpoint is inserted at the current PC. If this target does
3388 not support internal breakpoints at all, we also report the
3389 SIGTRAP without further processing; it's of no concern to us. */
3391 = (supports_breakpoints ()
3392 && (WSTOPSIG (w
) == SIGTRAP
3393 || ((WSTOPSIG (w
) == SIGILL
3394 || WSTOPSIG (w
) == SIGSEGV
)
3395 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3397 if (maybe_internal_trap
)
3399 /* Handle anything that requires bookkeeping before deciding to
3400 report the event or continue waiting. */
3402 /* First check if we can explain the SIGTRAP with an internal
3403 breakpoint, or if we should possibly report the event to GDB.
3404 Do this before anything that may remove or insert a
3406 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3408 /* We have a SIGTRAP, possibly a step-over dance has just
3409 finished. If so, tweak the state machine accordingly,
3410 reinsert breakpoints and delete any single-step
3412 step_over_finished
= finish_step_over (event_child
);
3414 /* Now invoke the callbacks of any internal breakpoints there. */
3415 check_breakpoints (event_child
->stop_pc
);
3417 /* Handle tracepoint data collecting. This may overflow the
3418 trace buffer, and cause a tracing stop, removing
3420 trace_event
= handle_tracepoints (event_child
);
3422 if (bp_explains_trap
)
3425 debug_printf ("Hit a gdbserver breakpoint.\n");
3430 /* We have some other signal, possibly a step-over dance was in
3431 progress, and it should be cancelled too. */
3432 step_over_finished
= finish_step_over (event_child
);
3435 /* We have all the data we need. Either report the event to GDB, or
3436 resume threads and keep waiting for more. */
3438 /* If we're collecting a fast tracepoint, finish the collection and
3439 move out of the jump pad before delivering a signal. See
3440 linux_stabilize_threads. */
3443 && WSTOPSIG (w
) != SIGTRAP
3444 && supports_fast_tracepoints ()
3445 && agent_loaded_p ())
3448 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3449 "to defer or adjust it.\n",
3450 WSTOPSIG (w
), lwpid_of (current_thread
));
3452 /* Allow debugging the jump pad itself. */
3453 if (current_thread
->last_resume_kind
!= resume_step
3454 && maybe_move_out_of_jump_pad (event_child
, &w
))
3456 enqueue_one_deferred_signal (event_child
, &w
);
3459 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3460 WSTOPSIG (w
), lwpid_of (current_thread
));
3462 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3466 return ignore_event (ourstatus
);
3470 if (event_child
->collecting_fast_tracepoint
)
3473 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3474 "Check if we're already there.\n",
3475 lwpid_of (current_thread
),
3476 event_child
->collecting_fast_tracepoint
);
3480 event_child
->collecting_fast_tracepoint
3481 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3483 if (event_child
->collecting_fast_tracepoint
!= 1)
3485 /* No longer need this breakpoint. */
3486 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3489 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3490 "stopping all threads momentarily.\n");
3492 /* Other running threads could hit this breakpoint.
3493 We don't handle moribund locations like GDB does,
3494 instead we always pause all threads when removing
3495 breakpoints, so that any step-over or
3496 decr_pc_after_break adjustment is always taken
3497 care of while the breakpoint is still
3499 stop_all_lwps (1, event_child
);
3501 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3502 event_child
->exit_jump_pad_bkpt
= NULL
;
3504 unstop_all_lwps (1, event_child
);
3506 gdb_assert (event_child
->suspended
>= 0);
3510 if (event_child
->collecting_fast_tracepoint
== 0)
3513 debug_printf ("fast tracepoint finished "
3514 "collecting successfully.\n");
3516 /* We may have a deferred signal to report. */
3517 if (dequeue_one_deferred_signal (event_child
, &w
))
3520 debug_printf ("dequeued one signal.\n");
3525 debug_printf ("no deferred signals.\n");
3527 if (stabilizing_threads
)
3529 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3530 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3534 debug_printf ("linux_wait_1 ret = %s, stopped "
3535 "while stabilizing threads\n",
3536 target_pid_to_str (ptid_of (current_thread
)));
3540 return ptid_of (current_thread
);
3546 /* Check whether GDB would be interested in this event. */
3548 /* Check if GDB is interested in this syscall. */
3550 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3551 && !gdb_catch_this_syscall_p (event_child
))
3555 debug_printf ("Ignored syscall for LWP %ld.\n",
3556 lwpid_of (current_thread
));
3559 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3564 return ignore_event (ourstatus
);
3567 /* If GDB is not interested in this signal, don't stop other
3568 threads, and don't report it to GDB. Just resume the inferior
3569 right away. We do this for threading-related signals as well as
3570 any that GDB specifically requested we ignore. But never ignore
3571 SIGSTOP if we sent it ourselves, and do not ignore signals when
3572 stepping - they may require special handling to skip the signal
3573 handler. Also never ignore signals that could be caused by a
3576 && current_thread
->last_resume_kind
!= resume_step
3578 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3579 (current_process ()->priv
->thread_db
!= NULL
3580 && (WSTOPSIG (w
) == __SIGRTMIN
3581 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3584 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3585 && !(WSTOPSIG (w
) == SIGSTOP
3586 && current_thread
->last_resume_kind
== resume_stop
)
3587 && !linux_wstatus_maybe_breakpoint (w
))))
3589 siginfo_t info
, *info_p
;
3592 debug_printf ("Ignored signal %d for LWP %ld.\n",
3593 WSTOPSIG (w
), lwpid_of (current_thread
));
3595 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3596 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3601 if (step_over_finished
)
3603 /* We cancelled this thread's step-over above. We still
3604 need to unsuspend all other LWPs, and set them back
3605 running again while the signal handler runs. */
3606 unsuspend_all_lwps (event_child
);
3608 /* Enqueue the pending signal info so that proceed_all_lwps
3610 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3612 proceed_all_lwps ();
3616 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3617 WSTOPSIG (w
), info_p
);
3623 return ignore_event (ourstatus
);
3626 /* Note that all addresses are always "out of the step range" when
3627 there's no range to begin with. */
3628 in_step_range
= lwp_in_step_range (event_child
);
3630 /* If GDB wanted this thread to single step, and the thread is out
3631 of the step range, we always want to report the SIGTRAP, and let
3632 GDB handle it. Watchpoints should always be reported. So should
3633 signals we can't explain. A SIGTRAP we can't explain could be a
3634 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3635 do, we're be able to handle GDB breakpoints on top of internal
3636 breakpoints, by handling the internal breakpoint and still
3637 reporting the event to GDB. If we don't, we're out of luck, GDB
3638 won't see the breakpoint hit. If we see a single-step event but
3639 the thread should be continuing, don't pass the trap to gdb.
3640 That indicates that we had previously finished a single-step but
3641 left the single-step pending -- see
3642 complete_ongoing_step_over. */
3643 report_to_gdb
= (!maybe_internal_trap
3644 || (current_thread
->last_resume_kind
== resume_step
3646 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3648 && !bp_explains_trap
3650 && !step_over_finished
3651 && !(current_thread
->last_resume_kind
== resume_continue
3652 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3653 || (gdb_breakpoint_here (event_child
->stop_pc
)
3654 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3655 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3656 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3658 run_breakpoint_commands (event_child
->stop_pc
);
3660 /* We found no reason GDB would want us to stop. We either hit one
3661 of our own breakpoints, or finished an internal step GDB
3662 shouldn't know about. */
3667 if (bp_explains_trap
)
3668 debug_printf ("Hit a gdbserver breakpoint.\n");
3669 if (step_over_finished
)
3670 debug_printf ("Step-over finished.\n");
3672 debug_printf ("Tracepoint event.\n");
3673 if (lwp_in_step_range (event_child
))
3674 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3675 paddress (event_child
->stop_pc
),
3676 paddress (event_child
->step_range_start
),
3677 paddress (event_child
->step_range_end
));
3680 /* We're not reporting this breakpoint to GDB, so apply the
3681 decr_pc_after_break adjustment to the inferior's regcache
3684 if (the_low_target
.set_pc
!= NULL
)
3686 struct regcache
*regcache
3687 = get_thread_regcache (current_thread
, 1);
3688 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3691 if (step_over_finished
)
3693 /* If we have finished stepping over a breakpoint, we've
3694 stopped and suspended all LWPs momentarily except the
3695 stepping one. This is where we resume them all again.
3696 We're going to keep waiting, so use proceed, which
3697 handles stepping over the next breakpoint. */
3698 unsuspend_all_lwps (event_child
);
3702 /* Remove the single-step breakpoints if any. Note that
3703 there isn't single-step breakpoint if we finished stepping
3705 if (can_software_single_step ()
3706 && has_single_step_breakpoints (current_thread
))
3708 stop_all_lwps (0, event_child
);
3709 delete_single_step_breakpoints (current_thread
);
3710 unstop_all_lwps (0, event_child
);
3715 debug_printf ("proceeding all threads.\n");
3716 proceed_all_lwps ();
3721 return ignore_event (ourstatus
);
3726 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3730 str
= target_waitstatus_to_string (&event_child
->waitstatus
);
3731 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3732 lwpid_of (get_lwp_thread (event_child
)), str
);
3735 if (current_thread
->last_resume_kind
== resume_step
)
3737 if (event_child
->step_range_start
== event_child
->step_range_end
)
3738 debug_printf ("GDB wanted to single-step, reporting event.\n");
3739 else if (!lwp_in_step_range (event_child
))
3740 debug_printf ("Out of step range, reporting event.\n");
3742 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3743 debug_printf ("Stopped by watchpoint.\n");
3744 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3745 debug_printf ("Stopped by GDB breakpoint.\n");
3747 debug_printf ("Hit a non-gdbserver trap event.\n");
3750 /* Alright, we're going to report a stop. */
3752 /* Remove single-step breakpoints. */
3753 if (can_software_single_step ())
3755 /* Remove single-step breakpoints or not. It it is true, stop all
3756 lwps, so that other threads won't hit the breakpoint in the
3758 int remove_single_step_breakpoints_p
= 0;
3762 remove_single_step_breakpoints_p
3763 = has_single_step_breakpoints (current_thread
);
3767 /* In all-stop, a stop reply cancels all previous resume
3768 requests. Delete all single-step breakpoints. */
3769 struct inferior_list_entry
*inf
, *tmp
;
3771 ALL_INFERIORS (&all_threads
, inf
, tmp
)
3773 struct thread_info
*thread
= (struct thread_info
*) inf
;
3775 if (has_single_step_breakpoints (thread
))
3777 remove_single_step_breakpoints_p
= 1;
3783 if (remove_single_step_breakpoints_p
)
3785 /* If we remove single-step breakpoints from memory, stop all lwps,
3786 so that other threads won't hit the breakpoint in the staled
3788 stop_all_lwps (0, event_child
);
3792 gdb_assert (has_single_step_breakpoints (current_thread
));
3793 delete_single_step_breakpoints (current_thread
);
3797 struct inferior_list_entry
*inf
, *tmp
;
3799 ALL_INFERIORS (&all_threads
, inf
, tmp
)
3801 struct thread_info
*thread
= (struct thread_info
*) inf
;
3803 if (has_single_step_breakpoints (thread
))
3804 delete_single_step_breakpoints (thread
);
3808 unstop_all_lwps (0, event_child
);
3812 if (!stabilizing_threads
)
3814 /* In all-stop, stop all threads. */
3816 stop_all_lwps (0, NULL
);
3818 if (step_over_finished
)
3822 /* If we were doing a step-over, all other threads but
3823 the stepping one had been paused in start_step_over,
3824 with their suspend counts incremented. We don't want
3825 to do a full unstop/unpause, because we're in
3826 all-stop mode (so we want threads stopped), but we
3827 still need to unsuspend the other threads, to
3828 decrement their `suspended' count back. */
3829 unsuspend_all_lwps (event_child
);
3833 /* If we just finished a step-over, then all threads had
3834 been momentarily paused. In all-stop, that's fine,
3835 we want threads stopped by now anyway. In non-stop,
3836 we need to re-resume threads that GDB wanted to be
3838 unstop_all_lwps (1, event_child
);
3842 /* If we're not waiting for a specific LWP, choose an event LWP
3843 from among those that have had events. Giving equal priority
3844 to all LWPs that have had events helps prevent
3846 if (ptid_equal (ptid
, minus_one_ptid
))
3848 event_child
->status_pending_p
= 1;
3849 event_child
->status_pending
= w
;
3851 select_event_lwp (&event_child
);
3853 /* current_thread and event_child must stay in sync. */
3854 current_thread
= get_lwp_thread (event_child
);
3856 event_child
->status_pending_p
= 0;
3857 w
= event_child
->status_pending
;
3861 /* Stabilize threads (move out of jump pads). */
3863 stabilize_threads ();
3867 /* If we just finished a step-over, then all threads had been
3868 momentarily paused. In all-stop, that's fine, we want
3869 threads stopped by now anyway. In non-stop, we need to
3870 re-resume threads that GDB wanted to be running. */
3871 if (step_over_finished
)
3872 unstop_all_lwps (1, event_child
);
3875 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3877 /* If the reported event is an exit, fork, vfork or exec, let
3880 /* Break the unreported fork relationship chain. */
3881 if (event_child
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
3882 || event_child
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
)
3884 event_child
->fork_relative
->fork_relative
= NULL
;
3885 event_child
->fork_relative
= NULL
;
3888 *ourstatus
= event_child
->waitstatus
;
3889 /* Clear the event lwp's waitstatus since we handled it already. */
3890 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3893 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3895 /* Now that we've selected our final event LWP, un-adjust its PC if
3896 it was a software breakpoint, and the client doesn't know we can
3897 adjust the breakpoint ourselves. */
3898 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3899 && !swbreak_feature
)
3901 int decr_pc
= the_low_target
.decr_pc_after_break
;
3905 struct regcache
*regcache
3906 = get_thread_regcache (current_thread
, 1);
3907 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3911 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3913 get_syscall_trapinfo (event_child
,
3914 &ourstatus
->value
.syscall_number
);
3915 ourstatus
->kind
= event_child
->syscall_state
;
3917 else if (current_thread
->last_resume_kind
== resume_stop
3918 && WSTOPSIG (w
) == SIGSTOP
)
3920 /* A thread that has been requested to stop by GDB with vCont;t,
3921 and it stopped cleanly, so report as SIG0. The use of
3922 SIGSTOP is an implementation detail. */
3923 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3925 else if (current_thread
->last_resume_kind
== resume_stop
3926 && WSTOPSIG (w
) != SIGSTOP
)
3928 /* A thread that has been requested to stop by GDB with vCont;t,
3929 but, it stopped for other reasons. */
3930 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3932 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3934 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3937 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3941 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3942 target_pid_to_str (ptid_of (current_thread
)),
3943 ourstatus
->kind
, ourstatus
->value
.sig
);
3947 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3948 return filter_exit_event (event_child
, ourstatus
);
3950 return ptid_of (current_thread
);
3953 /* Get rid of any pending event in the pipe. */
3955 async_file_flush (void)
3961 ret
= read (linux_event_pipe
[0], &buf
, 1);
3962 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3965 /* Put something in the pipe, so the event loop wakes up. */
3967 async_file_mark (void)
3971 async_file_flush ();
3974 ret
= write (linux_event_pipe
[1], "+", 1);
3975 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3977 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3978 be awakened anyway. */
3982 linux_wait (ptid_t ptid
,
3983 struct target_waitstatus
*ourstatus
, int target_options
)
3987 /* Flush the async file first. */
3988 if (target_is_async_p ())
3989 async_file_flush ();
3993 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3995 while ((target_options
& TARGET_WNOHANG
) == 0
3996 && ptid_equal (event_ptid
, null_ptid
)
3997 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3999 /* If at least one stop was reported, there may be more. A single
4000 SIGCHLD can signal more than one child stop. */
4001 if (target_is_async_p ()
4002 && (target_options
& TARGET_WNOHANG
) != 0
4003 && !ptid_equal (event_ptid
, null_ptid
))
4009 /* Send a signal to an LWP. */
4012 kill_lwp (unsigned long lwpid
, int signo
)
4017 ret
= syscall (__NR_tkill
, lwpid
, signo
);
4018 if (errno
== ENOSYS
)
4020 /* If tkill fails, then we are not using nptl threads, a
4021 configuration we no longer support. */
4022 perror_with_name (("tkill"));
4028 linux_stop_lwp (struct lwp_info
*lwp
)
4034 send_sigstop (struct lwp_info
*lwp
)
4038 pid
= lwpid_of (get_lwp_thread (lwp
));
4040 /* If we already have a pending stop signal for this process, don't
4042 if (lwp
->stop_expected
)
4045 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
4051 debug_printf ("Sending sigstop to lwp %d\n", pid
);
4053 lwp
->stop_expected
= 1;
4054 kill_lwp (pid
, SIGSTOP
);
4058 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
4060 struct thread_info
*thread
= (struct thread_info
*) entry
;
4061 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4063 /* Ignore EXCEPT. */
4074 /* Increment the suspend count of an LWP, and stop it, if not stopped
4077 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
4080 struct thread_info
*thread
= (struct thread_info
*) entry
;
4081 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4083 /* Ignore EXCEPT. */
4087 lwp_suspended_inc (lwp
);
4089 return send_sigstop_callback (entry
, except
);
4093 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
4095 /* Store the exit status for later. */
4096 lwp
->status_pending_p
= 1;
4097 lwp
->status_pending
= wstat
;
4099 /* Store in waitstatus as well, as there's nothing else to process
4101 if (WIFEXITED (wstat
))
4103 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
4104 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
4106 else if (WIFSIGNALED (wstat
))
4108 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
4109 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
4112 /* Prevent trying to stop it. */
4115 /* No further stops are expected from a dead lwp. */
4116 lwp
->stop_expected
= 0;
4119 /* Return true if LWP has exited already, and has a pending exit event
4120 to report to GDB. */
4123 lwp_is_marked_dead (struct lwp_info
*lwp
)
4125 return (lwp
->status_pending_p
4126 && (WIFEXITED (lwp
->status_pending
)
4127 || WIFSIGNALED (lwp
->status_pending
)));
4130 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4133 wait_for_sigstop (void)
4135 struct thread_info
*saved_thread
;
4140 saved_thread
= current_thread
;
4141 if (saved_thread
!= NULL
)
4142 saved_tid
= saved_thread
->entry
.id
;
4144 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4147 debug_printf ("wait_for_sigstop: pulling events\n");
4149 /* Passing NULL_PTID as filter indicates we want all events to be
4150 left pending. Eventually this returns when there are no
4151 unwaited-for children left. */
4152 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4154 gdb_assert (ret
== -1);
4156 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4157 current_thread
= saved_thread
;
4161 debug_printf ("Previously current thread died.\n");
4163 /* We can't change the current inferior behind GDB's back,
4164 otherwise, a subsequent command may apply to the wrong
4166 current_thread
= NULL
;
4170 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
4171 move it out, because we need to report the stop event to GDB. For
4172 example, if the user puts a breakpoint in the jump pad, it's
4173 because she wants to debug it. */
4176 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
4178 struct thread_info
*thread
= (struct thread_info
*) entry
;
4179 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4181 if (lwp
->suspended
!= 0)
4183 internal_error (__FILE__
, __LINE__
,
4184 "LWP %ld is suspended, suspended=%d\n",
4185 lwpid_of (thread
), lwp
->suspended
);
4187 gdb_assert (lwp
->stopped
);
4189 /* Allow debugging the jump pad, gdb_collect, etc.. */
4190 return (supports_fast_tracepoints ()
4191 && agent_loaded_p ()
4192 && (gdb_breakpoint_here (lwp
->stop_pc
)
4193 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4194 || thread
->last_resume_kind
== resume_step
)
4195 && linux_fast_tracepoint_collecting (lwp
, NULL
));
4199 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
4201 struct thread_info
*thread
= (struct thread_info
*) entry
;
4202 struct thread_info
*saved_thread
;
4203 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4206 if (lwp
->suspended
!= 0)
4208 internal_error (__FILE__
, __LINE__
,
4209 "LWP %ld is suspended, suspended=%d\n",
4210 lwpid_of (thread
), lwp
->suspended
);
4212 gdb_assert (lwp
->stopped
);
4214 /* For gdb_breakpoint_here. */
4215 saved_thread
= current_thread
;
4216 current_thread
= thread
;
4218 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4220 /* Allow debugging the jump pad, gdb_collect, etc. */
4221 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4222 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4223 && thread
->last_resume_kind
!= resume_step
4224 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4227 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4232 lwp
->status_pending_p
= 0;
4233 enqueue_one_deferred_signal (lwp
, wstat
);
4236 debug_printf ("Signal %d for LWP %ld deferred "
4238 WSTOPSIG (*wstat
), lwpid_of (thread
));
4241 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4244 lwp_suspended_inc (lwp
);
4246 current_thread
= saved_thread
;
4250 lwp_running (struct inferior_list_entry
*entry
, void *data
)
4252 struct thread_info
*thread
= (struct thread_info
*) entry
;
4253 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4255 if (lwp_is_marked_dead (lwp
))
4262 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4263 If SUSPEND, then also increase the suspend count of every LWP,
4267 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4269 /* Should not be called recursively. */
4270 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4275 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4276 suspend
? "stop-and-suspend" : "stop",
4278 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4282 stopping_threads
= (suspend
4283 ? STOPPING_AND_SUSPENDING_THREADS
4284 : STOPPING_THREADS
);
4287 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
4289 find_inferior (&all_threads
, send_sigstop_callback
, except
);
4290 wait_for_sigstop ();
4291 stopping_threads
= NOT_STOPPING_THREADS
;
4295 debug_printf ("stop_all_lwps done, setting stopping_threads "
4296 "back to !stopping\n");
4301 /* Enqueue one signal in the chain of signals which need to be
4302 delivered to this process on next resume. */
4305 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4307 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4309 p_sig
->prev
= lwp
->pending_signals
;
4310 p_sig
->signal
= signal
;
4312 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4314 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4315 lwp
->pending_signals
= p_sig
;
4318 /* Install breakpoints for software single stepping. */
4321 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4323 struct thread_info
*thread
= get_lwp_thread (lwp
);
4324 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4325 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
4327 current_thread
= thread
;
4328 std::vector
<CORE_ADDR
> next_pcs
= the_low_target
.get_next_pcs (regcache
);
4330 for (CORE_ADDR pc
: next_pcs
)
4331 set_single_step_breakpoint (pc
, current_ptid
);
4333 do_cleanups (old_chain
);
4336 /* Single step via hardware or software single step.
4337 Return 1 if hardware single stepping, 0 if software single stepping
4338 or can't single step. */
4341 single_step (struct lwp_info
* lwp
)
4345 if (can_hardware_single_step ())
4349 else if (can_software_single_step ())
4351 install_software_single_step_breakpoints (lwp
);
4357 debug_printf ("stepping is not implemented on this target");
4363 /* The signal can be delivered to the inferior if we are not trying to
4364 finish a fast tracepoint collect. Since signal can be delivered in
4365 the step-over, the program may go to signal handler and trap again
4366 after return from the signal handler. We can live with the spurious
4370 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4372 return !lwp
->collecting_fast_tracepoint
;
4375 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4376 SIGNAL is nonzero, give it that signal. */
4379 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4380 int step
, int signal
, siginfo_t
*info
)
4382 struct thread_info
*thread
= get_lwp_thread (lwp
);
4383 struct thread_info
*saved_thread
;
4384 int fast_tp_collecting
;
4386 struct process_info
*proc
= get_thread_process (thread
);
4388 /* Note that target description may not be initialised
4389 (proc->tdesc == NULL) at this point because the program hasn't
4390 stopped at the first instruction yet. It means GDBserver skips
4391 the extra traps from the wrapper program (see option --wrapper).
4392 Code in this function that requires register access should be
4393 guarded by proc->tdesc == NULL or something else. */
4395 if (lwp
->stopped
== 0)
4398 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4400 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
4402 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
4404 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4405 user used the "jump" command, or "set $pc = foo"). */
4406 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4408 /* Collecting 'while-stepping' actions doesn't make sense
4410 release_while_stepping_state_list (thread
);
4413 /* If we have pending signals or status, and a new signal, enqueue the
4414 signal. Also enqueue the signal if it can't be delivered to the
4415 inferior right now. */
4417 && (lwp
->status_pending_p
4418 || lwp
->pending_signals
!= NULL
4419 || !lwp_signal_can_be_delivered (lwp
)))
4421 enqueue_pending_signal (lwp
, signal
, info
);
4423 /* Postpone any pending signal. It was enqueued above. */
4427 if (lwp
->status_pending_p
)
4430 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4431 " has pending status\n",
4432 lwpid_of (thread
), step
? "step" : "continue",
4433 lwp
->stop_expected
? "expected" : "not expected");
4437 saved_thread
= current_thread
;
4438 current_thread
= thread
;
4440 /* This bit needs some thinking about. If we get a signal that
4441 we must report while a single-step reinsert is still pending,
4442 we often end up resuming the thread. It might be better to
4443 (ew) allow a stack of pending events; then we could be sure that
4444 the reinsert happened right away and not lose any signals.
4446 Making this stack would also shrink the window in which breakpoints are
4447 uninserted (see comment in linux_wait_for_lwp) but not enough for
4448 complete correctness, so it won't solve that problem. It may be
4449 worthwhile just to solve this one, however. */
4450 if (lwp
->bp_reinsert
!= 0)
4453 debug_printf (" pending reinsert at 0x%s\n",
4454 paddress (lwp
->bp_reinsert
));
4456 if (can_hardware_single_step ())
4458 if (fast_tp_collecting
== 0)
4461 warning ("BAD - reinserting but not stepping.");
4463 warning ("BAD - reinserting and suspended(%d).",
4468 step
= maybe_hw_step (thread
);
4471 if (fast_tp_collecting
== 1)
4474 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4475 " (exit-jump-pad-bkpt)\n",
4478 else if (fast_tp_collecting
== 2)
4481 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4482 " single-stepping\n",
4485 if (can_hardware_single_step ())
4489 internal_error (__FILE__
, __LINE__
,
4490 "moving out of jump pad single-stepping"
4491 " not implemented on this target");
4495 /* If we have while-stepping actions in this thread set it stepping.
4496 If we have a signal to deliver, it may or may not be set to
4497 SIG_IGN, we don't know. Assume so, and allow collecting
4498 while-stepping into a signal handler. A possible smart thing to
4499 do would be to set an internal breakpoint at the signal return
4500 address, continue, and carry on catching this while-stepping
4501 action only when that breakpoint is hit. A future
4503 if (thread
->while_stepping
!= NULL
)
4506 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4509 step
= single_step (lwp
);
4512 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4514 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4516 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4520 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4521 (long) lwp
->stop_pc
);
4525 /* If we have pending signals, consume one if it can be delivered to
4527 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4529 struct pending_signals
**p_sig
;
4531 p_sig
= &lwp
->pending_signals
;
4532 while ((*p_sig
)->prev
!= NULL
)
4533 p_sig
= &(*p_sig
)->prev
;
4535 signal
= (*p_sig
)->signal
;
4536 if ((*p_sig
)->info
.si_signo
!= 0)
4537 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4545 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4546 lwpid_of (thread
), step
? "step" : "continue", signal
,
4547 lwp
->stop_expected
? "expected" : "not expected");
4549 if (the_low_target
.prepare_to_resume
!= NULL
)
4550 the_low_target
.prepare_to_resume (lwp
);
4552 regcache_invalidate_thread (thread
);
4554 lwp
->stepping
= step
;
4556 ptrace_request
= PTRACE_SINGLESTEP
;
4557 else if (gdb_catching_syscalls_p (lwp
))
4558 ptrace_request
= PTRACE_SYSCALL
;
4560 ptrace_request
= PTRACE_CONT
;
4561 ptrace (ptrace_request
,
4563 (PTRACE_TYPE_ARG3
) 0,
4564 /* Coerce to a uintptr_t first to avoid potential gcc warning
4565 of coercing an 8 byte integer to a 4 byte pointer. */
4566 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4568 current_thread
= saved_thread
;
4570 perror_with_name ("resuming thread");
4572 /* Successfully resumed. Clear state that no longer makes sense,
4573 and mark the LWP as running. Must not do this before resuming
4574 otherwise if that fails other code will be confused. E.g., we'd
4575 later try to stop the LWP and hang forever waiting for a stop
4576 status. Note that we must not throw after this is cleared,
4577 otherwise handle_zombie_lwp_error would get confused. */
4579 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4582 /* Called when we try to resume a stopped LWP and that errors out. If
4583 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4584 or about to become), discard the error, clear any pending status
4585 the LWP may have, and return true (we'll collect the exit status
4586 soon enough). Otherwise, return false. */
4589 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4591 struct thread_info
*thread
= get_lwp_thread (lp
);
4593 /* If we get an error after resuming the LWP successfully, we'd
4594 confuse !T state for the LWP being gone. */
4595 gdb_assert (lp
->stopped
);
4597 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4598 because even if ptrace failed with ESRCH, the tracee may be "not
4599 yet fully dead", but already refusing ptrace requests. In that
4600 case the tracee has 'R (Running)' state for a little bit
4601 (observed in Linux 3.18). See also the note on ESRCH in the
4602 ptrace(2) man page. Instead, check whether the LWP has any state
4603 other than ptrace-stopped. */
4605 /* Don't assume anything if /proc/PID/status can't be read. */
4606 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4608 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4609 lp
->status_pending_p
= 0;
4615 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4616 disappears while we try to resume it. */
4619 linux_resume_one_lwp (struct lwp_info
*lwp
,
4620 int step
, int signal
, siginfo_t
*info
)
4624 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4626 CATCH (ex
, RETURN_MASK_ERROR
)
4628 if (!check_ptrace_stopped_lwp_gone (lwp
))
4629 throw_exception (ex
);
4634 struct thread_resume_array
4636 struct thread_resume
*resume
;
4640 /* This function is called once per thread via find_inferior.
4641 ARG is a pointer to a thread_resume_array struct.
4642 We look up the thread specified by ENTRY in ARG, and mark the thread
4643 with a pointer to the appropriate resume request.
4645 This algorithm is O(threads * resume elements), but resume elements
4646 is small (and will remain small at least until GDB supports thread
4650 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
4652 struct thread_info
*thread
= (struct thread_info
*) entry
;
4653 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4655 struct thread_resume_array
*r
;
4657 r
= (struct thread_resume_array
*) arg
;
4659 for (ndx
= 0; ndx
< r
->n
; ndx
++)
4661 ptid_t ptid
= r
->resume
[ndx
].thread
;
4662 if (ptid_equal (ptid
, minus_one_ptid
)
4663 || ptid_equal (ptid
, entry
->id
)
4664 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4666 || (ptid_get_pid (ptid
) == pid_of (thread
)
4667 && (ptid_is_pid (ptid
)
4668 || ptid_get_lwp (ptid
) == -1)))
4670 if (r
->resume
[ndx
].kind
== resume_stop
4671 && thread
->last_resume_kind
== resume_stop
)
4674 debug_printf ("already %s LWP %ld at GDB's request\n",
4675 (thread
->last_status
.kind
4676 == TARGET_WAITKIND_STOPPED
)
4684 /* Ignore (wildcard) resume requests for already-resumed
4686 if (r
->resume
[ndx
].kind
!= resume_stop
4687 && thread
->last_resume_kind
!= resume_stop
)
4690 debug_printf ("already %s LWP %ld at GDB's request\n",
4691 (thread
->last_resume_kind
4699 /* Don't let wildcard resumes resume fork children that GDB
4700 does not yet know are new fork children. */
4701 if (lwp
->fork_relative
!= NULL
)
4703 struct inferior_list_entry
*inf
, *tmp
;
4704 struct lwp_info
*rel
= lwp
->fork_relative
;
4706 if (rel
->status_pending_p
4707 && (rel
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
4708 || rel
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
))
4711 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4717 /* If the thread has a pending event that has already been
4718 reported to GDBserver core, but GDB has not pulled the
4719 event out of the vStopped queue yet, likewise, ignore the
4720 (wildcard) resume request. */
4721 if (in_queued_stop_replies (entry
->id
))
4724 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4729 lwp
->resume
= &r
->resume
[ndx
];
4730 thread
->last_resume_kind
= lwp
->resume
->kind
;
4732 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4733 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4735 /* If we had a deferred signal to report, dequeue one now.
4736 This can happen if LWP gets more than one signal while
4737 trying to get out of a jump pad. */
4739 && !lwp
->status_pending_p
4740 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4742 lwp
->status_pending_p
= 1;
4745 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4746 "leaving status pending.\n",
4747 WSTOPSIG (lwp
->status_pending
),
4755 /* No resume action for this thread. */
4761 /* find_inferior callback for linux_resume.
4762 Set *FLAG_P if this lwp has an interesting status pending. */
4765 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
4767 struct thread_info
*thread
= (struct thread_info
*) entry
;
4768 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4770 /* LWPs which will not be resumed are not interesting, because
4771 we might not wait for them next time through linux_wait. */
4772 if (lwp
->resume
== NULL
)
4775 if (thread_still_has_status_pending_p (thread
))
4776 * (int *) flag_p
= 1;
4781 /* Return 1 if this lwp that GDB wants running is stopped at an
4782 internal breakpoint that we need to step over. It assumes that any
4783 required STOP_PC adjustment has already been propagated to the
4784 inferior's regcache. */
4787 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
4789 struct thread_info
*thread
= (struct thread_info
*) entry
;
4790 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4791 struct thread_info
*saved_thread
;
4793 struct process_info
*proc
= get_thread_process (thread
);
4795 /* GDBserver is skipping the extra traps from the wrapper program,
4796 don't have to do step over. */
4797 if (proc
->tdesc
== NULL
)
4800 /* LWPs which will not be resumed are not interesting, because we
4801 might not wait for them next time through linux_wait. */
4806 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4811 if (thread
->last_resume_kind
== resume_stop
)
4814 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4820 gdb_assert (lwp
->suspended
>= 0);
4825 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4830 if (lwp
->status_pending_p
)
4833 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4839 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4843 /* If the PC has changed since we stopped, then don't do anything,
4844 and let the breakpoint/tracepoint be hit. This happens if, for
4845 instance, GDB handled the decr_pc_after_break subtraction itself,
4846 GDB is OOL stepping this thread, or the user has issued a "jump"
4847 command, or poked thread's registers herself. */
4848 if (pc
!= lwp
->stop_pc
)
4851 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4852 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4854 paddress (lwp
->stop_pc
), paddress (pc
));
4858 /* On software single step target, resume the inferior with signal
4859 rather than stepping over. */
4860 if (can_software_single_step ()
4861 && lwp
->pending_signals
!= NULL
4862 && lwp_signal_can_be_delivered (lwp
))
4865 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4872 saved_thread
= current_thread
;
4873 current_thread
= thread
;
4875 /* We can only step over breakpoints we know about. */
4876 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4878 /* Don't step over a breakpoint that GDB expects to hit
4879 though. If the condition is being evaluated on the target's side
4880 and it evaluate to false, step over this breakpoint as well. */
4881 if (gdb_breakpoint_here (pc
)
4882 && gdb_condition_true_at_breakpoint (pc
)
4883 && gdb_no_commands_at_breakpoint (pc
))
4886 debug_printf ("Need step over [LWP %ld]? yes, but found"
4887 " GDB breakpoint at 0x%s; skipping step over\n",
4888 lwpid_of (thread
), paddress (pc
));
4890 current_thread
= saved_thread
;
4896 debug_printf ("Need step over [LWP %ld]? yes, "
4897 "found breakpoint at 0x%s\n",
4898 lwpid_of (thread
), paddress (pc
));
4900 /* We've found an lwp that needs stepping over --- return 1 so
4901 that find_inferior stops looking. */
4902 current_thread
= saved_thread
;
4908 current_thread
= saved_thread
;
4911 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4913 lwpid_of (thread
), paddress (pc
));
4918 /* Start a step-over operation on LWP. When LWP stopped at a
4919 breakpoint, to make progress, we need to remove the breakpoint out
4920 of the way. If we let other threads run while we do that, they may
4921 pass by the breakpoint location and miss hitting it. To avoid
4922 that, a step-over momentarily stops all threads while LWP is
4923 single-stepped by either hardware or software while the breakpoint
4924 is temporarily uninserted from the inferior. When the single-step
4925 finishes, we reinsert the breakpoint, and let all threads that are
4926 supposed to be running, run again. */
4929 start_step_over (struct lwp_info
*lwp
)
4931 struct thread_info
*thread
= get_lwp_thread (lwp
);
4932 struct thread_info
*saved_thread
;
4937 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4940 stop_all_lwps (1, lwp
);
4942 if (lwp
->suspended
!= 0)
4944 internal_error (__FILE__
, __LINE__
,
4945 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4950 debug_printf ("Done stopping all threads for step-over.\n");
4952 /* Note, we should always reach here with an already adjusted PC,
4953 either by GDB (if we're resuming due to GDB's request), or by our
4954 caller, if we just finished handling an internal breakpoint GDB
4955 shouldn't care about. */
4958 saved_thread
= current_thread
;
4959 current_thread
= thread
;
4961 lwp
->bp_reinsert
= pc
;
4962 uninsert_breakpoints_at (pc
);
4963 uninsert_fast_tracepoint_jumps_at (pc
);
4965 step
= single_step (lwp
);
4967 current_thread
= saved_thread
;
4969 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4971 /* Require next event from this LWP. */
4972 step_over_bkpt
= thread
->entry
.id
;
4976 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4977 start_step_over, if still there, and delete any single-step
4978 breakpoints we've set, on non hardware single-step targets. */
4981 finish_step_over (struct lwp_info
*lwp
)
4983 if (lwp
->bp_reinsert
!= 0)
4985 struct thread_info
*saved_thread
= current_thread
;
4988 debug_printf ("Finished step over.\n");
4990 current_thread
= get_lwp_thread (lwp
);
4992 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4993 may be no breakpoint to reinsert there by now. */
4994 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4995 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4997 lwp
->bp_reinsert
= 0;
4999 /* Delete any single-step breakpoints. No longer needed. We
5000 don't have to worry about other threads hitting this trap,
5001 and later not being able to explain it, because we were
5002 stepping over a breakpoint, and we hold all threads but
5003 LWP stopped while doing that. */
5004 if (!can_hardware_single_step ())
5006 gdb_assert (has_single_step_breakpoints (current_thread
));
5007 delete_single_step_breakpoints (current_thread
);
5010 step_over_bkpt
= null_ptid
;
5011 current_thread
= saved_thread
;
5018 /* If there's a step over in progress, wait until all threads stop
5019 (that is, until the stepping thread finishes its step), and
5020 unsuspend all lwps. The stepping thread ends with its status
5021 pending, which is processed later when we get back to processing
5025 complete_ongoing_step_over (void)
5027 if (!ptid_equal (step_over_bkpt
, null_ptid
))
5029 struct lwp_info
*lwp
;
5034 debug_printf ("detach: step over in progress, finish it first\n");
5036 /* Passing NULL_PTID as filter indicates we want all events to
5037 be left pending. Eventually this returns when there are no
5038 unwaited-for children left. */
5039 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
5041 gdb_assert (ret
== -1);
5043 lwp
= find_lwp_pid (step_over_bkpt
);
5045 finish_step_over (lwp
);
5046 step_over_bkpt
= null_ptid
;
5047 unsuspend_all_lwps (lwp
);
5051 /* This function is called once per thread. We check the thread's resume
5052 request, which will tell us whether to resume, step, or leave the thread
5053 stopped; and what signal, if any, it should be sent.
5055 For threads which we aren't explicitly told otherwise, we preserve
5056 the stepping flag; this is used for stepping over gdbserver-placed
5059 If pending_flags was set in any thread, we queue any needed
5060 signals, since we won't actually resume. We already have a pending
5061 event to report, so we don't need to preserve any step requests;
5062 they should be re-issued if necessary. */
5065 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
5067 struct thread_info
*thread
= (struct thread_info
*) entry
;
5068 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5069 int leave_all_stopped
= * (int *) arg
;
5072 if (lwp
->resume
== NULL
)
5075 if (lwp
->resume
->kind
== resume_stop
)
5078 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
5083 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
5085 /* Stop the thread, and wait for the event asynchronously,
5086 through the event loop. */
5092 debug_printf ("already stopped LWP %ld\n",
5095 /* The LWP may have been stopped in an internal event that
5096 was not meant to be notified back to GDB (e.g., gdbserver
5097 breakpoint), so we should be reporting a stop event in
5100 /* If the thread already has a pending SIGSTOP, this is a
5101 no-op. Otherwise, something later will presumably resume
5102 the thread and this will cause it to cancel any pending
5103 operation, due to last_resume_kind == resume_stop. If
5104 the thread already has a pending status to report, we
5105 will still report it the next time we wait - see
5106 status_pending_p_callback. */
5108 /* If we already have a pending signal to report, then
5109 there's no need to queue a SIGSTOP, as this means we're
5110 midway through moving the LWP out of the jumppad, and we
5111 will report the pending signal as soon as that is
5113 if (lwp
->pending_signals_to_report
== NULL
)
5117 /* For stop requests, we're done. */
5119 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5123 /* If this thread which is about to be resumed has a pending status,
5124 then don't resume it - we can just report the pending status.
5125 Likewise if it is suspended, because e.g., another thread is
5126 stepping past a breakpoint. Make sure to queue any signals that
5127 would otherwise be sent. In all-stop mode, we do this decision
5128 based on if *any* thread has a pending status. If there's a
5129 thread that needs the step-over-breakpoint dance, then don't
5130 resume any other thread but that particular one. */
5131 leave_pending
= (lwp
->suspended
5132 || lwp
->status_pending_p
5133 || leave_all_stopped
);
5135 /* If we have a new signal, enqueue the signal. */
5136 if (lwp
->resume
->sig
!= 0)
5138 siginfo_t info
, *info_p
;
5140 /* If this is the same signal we were previously stopped by,
5141 make sure to queue its siginfo. */
5142 if (WIFSTOPPED (lwp
->last_status
)
5143 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
5144 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
5145 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
5150 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
5156 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
5158 proceed_one_lwp (entry
, NULL
);
5163 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5166 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5172 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5174 struct thread_resume_array array
= { resume_info
, n
};
5175 struct thread_info
*need_step_over
= NULL
;
5177 int leave_all_stopped
;
5182 debug_printf ("linux_resume:\n");
5185 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
5187 /* If there is a thread which would otherwise be resumed, which has
5188 a pending status, then don't resume any threads - we can just
5189 report the pending status. Make sure to queue any signals that
5190 would otherwise be sent. In non-stop mode, we'll apply this
5191 logic to each thread individually. We consume all pending events
5192 before considering to start a step-over (in all-stop). */
5195 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
5197 /* If there is a thread which would otherwise be resumed, which is
5198 stopped at a breakpoint that needs stepping over, then don't
5199 resume any threads - have it step over the breakpoint with all
5200 other threads stopped, then resume all threads again. Make sure
5201 to queue any signals that would otherwise be delivered or
5203 if (!any_pending
&& supports_breakpoints ())
5205 = (struct thread_info
*) find_inferior (&all_threads
,
5206 need_step_over_p
, NULL
);
5208 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5212 if (need_step_over
!= NULL
)
5213 debug_printf ("Not resuming all, need step over\n");
5214 else if (any_pending
)
5215 debug_printf ("Not resuming, all-stop and found "
5216 "an LWP with pending status\n");
5218 debug_printf ("Resuming, no pending status or step over needed\n");
5221 /* Even if we're leaving threads stopped, queue all signals we'd
5222 otherwise deliver. */
5223 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
5226 start_step_over (get_thread_lwp (need_step_over
));
5230 debug_printf ("linux_resume done\n");
5234 /* We may have events that were pending that can/should be sent to
5235 the client now. Trigger a linux_wait call. */
5236 if (target_is_async_p ())
5240 /* This function is called once per thread. We check the thread's
5241 last resume request, which will tell us whether to resume, step, or
5242 leave the thread stopped. Any signal the client requested to be
5243 delivered has already been enqueued at this point.
5245 If any thread that GDB wants running is stopped at an internal
5246 breakpoint that needs stepping over, we start a step-over operation
5247 on that particular thread, and leave all others stopped. */
5250 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
5252 struct thread_info
*thread
= (struct thread_info
*) entry
;
5253 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5260 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5265 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5269 if (thread
->last_resume_kind
== resume_stop
5270 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5273 debug_printf (" client wants LWP to remain %ld stopped\n",
5278 if (lwp
->status_pending_p
)
5281 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5286 gdb_assert (lwp
->suspended
>= 0);
5291 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5295 if (thread
->last_resume_kind
== resume_stop
5296 && lwp
->pending_signals_to_report
== NULL
5297 && lwp
->collecting_fast_tracepoint
== 0)
5299 /* We haven't reported this LWP as stopped yet (otherwise, the
5300 last_status.kind check above would catch it, and we wouldn't
5301 reach here. This LWP may have been momentarily paused by a
5302 stop_all_lwps call while handling for example, another LWP's
5303 step-over. In that case, the pending expected SIGSTOP signal
5304 that was queued at vCont;t handling time will have already
5305 been consumed by wait_for_sigstop, and so we need to requeue
5306 another one here. Note that if the LWP already has a SIGSTOP
5307 pending, this is a no-op. */
5310 debug_printf ("Client wants LWP %ld to stop. "
5311 "Making sure it has a SIGSTOP pending\n",
5317 if (thread
->last_resume_kind
== resume_step
)
5320 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5323 /* If resume_step is requested by GDB, install single-step
5324 breakpoints when the thread is about to be actually resumed if
5325 the single-step breakpoints weren't removed. */
5326 if (can_software_single_step ()
5327 && !has_single_step_breakpoints (thread
))
5328 install_software_single_step_breakpoints (lwp
);
5330 step
= maybe_hw_step (thread
);
5332 else if (lwp
->bp_reinsert
!= 0)
5335 debug_printf (" stepping LWP %ld, reinsert set\n",
5338 step
= maybe_hw_step (thread
);
5343 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5348 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
5350 struct thread_info
*thread
= (struct thread_info
*) entry
;
5351 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5356 lwp_suspended_decr (lwp
);
5358 return proceed_one_lwp (entry
, except
);
5361 /* When we finish a step-over, set threads running again. If there's
5362 another thread that may need a step-over, now's the time to start
5363 it. Eventually, we'll move all threads past their breakpoints. */
5366 proceed_all_lwps (void)
5368 struct thread_info
*need_step_over
;
5370 /* If there is a thread which would otherwise be resumed, which is
5371 stopped at a breakpoint that needs stepping over, then don't
5372 resume any threads - have it step over the breakpoint with all
5373 other threads stopped, then resume all threads again. */
5375 if (supports_breakpoints ())
5378 = (struct thread_info
*) find_inferior (&all_threads
,
5379 need_step_over_p
, NULL
);
5381 if (need_step_over
!= NULL
)
5384 debug_printf ("proceed_all_lwps: found "
5385 "thread %ld needing a step-over\n",
5386 lwpid_of (need_step_over
));
5388 start_step_over (get_thread_lwp (need_step_over
));
5394 debug_printf ("Proceeding, no step-over needed\n");
5396 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
5399 /* Stopped LWPs that the client wanted to be running, that don't have
5400 pending statuses, are set to run again, except for EXCEPT, if not
5401 NULL. This undoes a stop_all_lwps call. */
5404 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5410 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5411 lwpid_of (get_lwp_thread (except
)));
5413 debug_printf ("unstopping all lwps\n");
5417 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
5419 find_inferior (&all_threads
, proceed_one_lwp
, except
);
5423 debug_printf ("unstop_all_lwps done\n");
5429 #ifdef HAVE_LINUX_REGSETS
5431 #define use_linux_regsets 1
5433 /* Returns true if REGSET has been disabled. */
5436 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5438 return (info
->disabled_regsets
!= NULL
5439 && info
->disabled_regsets
[regset
- info
->regsets
]);
5442 /* Disable REGSET. */
5445 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5449 dr_offset
= regset
- info
->regsets
;
5450 if (info
->disabled_regsets
== NULL
)
5451 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5452 info
->disabled_regsets
[dr_offset
] = 1;
5456 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5457 struct regcache
*regcache
)
5459 struct regset_info
*regset
;
5460 int saw_general_regs
= 0;
5464 pid
= lwpid_of (current_thread
);
5465 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5470 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5473 buf
= xmalloc (regset
->size
);
5475 nt_type
= regset
->nt_type
;
5479 iov
.iov_len
= regset
->size
;
5480 data
= (void *) &iov
;
5486 res
= ptrace (regset
->get_request
, pid
,
5487 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5489 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5495 /* If we get EIO on a regset, do not try it again for
5496 this process mode. */
5497 disable_regset (regsets_info
, regset
);
5499 else if (errno
== ENODATA
)
5501 /* ENODATA may be returned if the regset is currently
5502 not "active". This can happen in normal operation,
5503 so suppress the warning in this case. */
5505 else if (errno
== ESRCH
)
5507 /* At this point, ESRCH should mean the process is
5508 already gone, in which case we simply ignore attempts
5509 to read its registers. */
5514 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5521 if (regset
->type
== GENERAL_REGS
)
5522 saw_general_regs
= 1;
5523 regset
->store_function (regcache
, buf
);
5527 if (saw_general_regs
)
5534 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5535 struct regcache
*regcache
)
5537 struct regset_info
*regset
;
5538 int saw_general_regs
= 0;
5542 pid
= lwpid_of (current_thread
);
5543 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5548 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5549 || regset
->fill_function
== NULL
)
5552 buf
= xmalloc (regset
->size
);
5554 /* First fill the buffer with the current register set contents,
5555 in case there are any items in the kernel's regset that are
5556 not in gdbserver's regcache. */
5558 nt_type
= regset
->nt_type
;
5562 iov
.iov_len
= regset
->size
;
5563 data
= (void *) &iov
;
5569 res
= ptrace (regset
->get_request
, pid
,
5570 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5572 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5577 /* Then overlay our cached registers on that. */
5578 regset
->fill_function (regcache
, buf
);
5580 /* Only now do we write the register set. */
5582 res
= ptrace (regset
->set_request
, pid
,
5583 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5585 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5593 /* If we get EIO on a regset, do not try it again for
5594 this process mode. */
5595 disable_regset (regsets_info
, regset
);
5597 else if (errno
== ESRCH
)
5599 /* At this point, ESRCH should mean the process is
5600 already gone, in which case we simply ignore attempts
5601 to change its registers. See also the related
5602 comment in linux_resume_one_lwp. */
5608 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5611 else if (regset
->type
== GENERAL_REGS
)
5612 saw_general_regs
= 1;
5615 if (saw_general_regs
)
5621 #else /* !HAVE_LINUX_REGSETS */
5623 #define use_linux_regsets 0
5624 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5625 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5629 /* Return 1 if register REGNO is supported by one of the regset ptrace
5630 calls or 0 if it has to be transferred individually. */
5633 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5635 unsigned char mask
= 1 << (regno
% 8);
5636 size_t index
= regno
/ 8;
5638 return (use_linux_regsets
5639 && (regs_info
->regset_bitmap
== NULL
5640 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5643 #ifdef HAVE_LINUX_USRREGS
5646 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5650 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5651 error ("Invalid register number %d.", regnum
);
5653 addr
= usrregs
->regmap
[regnum
];
5658 /* Fetch one register. */
5660 fetch_register (const struct usrregs_info
*usrregs
,
5661 struct regcache
*regcache
, int regno
)
5668 if (regno
>= usrregs
->num_regs
)
5670 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5673 regaddr
= register_addr (usrregs
, regno
);
5677 size
= ((register_size (regcache
->tdesc
, regno
)
5678 + sizeof (PTRACE_XFER_TYPE
) - 1)
5679 & -sizeof (PTRACE_XFER_TYPE
));
5680 buf
= (char *) alloca (size
);
5682 pid
= lwpid_of (current_thread
);
5683 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5686 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5687 ptrace (PTRACE_PEEKUSER
, pid
,
5688 /* Coerce to a uintptr_t first to avoid potential gcc warning
5689 of coercing an 8 byte integer to a 4 byte pointer. */
5690 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5691 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5693 error ("reading register %d: %s", regno
, strerror (errno
));
5696 if (the_low_target
.supply_ptrace_register
)
5697 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5699 supply_register (regcache
, regno
, buf
);
5702 /* Store one register. */
5704 store_register (const struct usrregs_info
*usrregs
,
5705 struct regcache
*regcache
, int regno
)
5712 if (regno
>= usrregs
->num_regs
)
5714 if ((*the_low_target
.cannot_store_register
) (regno
))
5717 regaddr
= register_addr (usrregs
, regno
);
5721 size
= ((register_size (regcache
->tdesc
, regno
)
5722 + sizeof (PTRACE_XFER_TYPE
) - 1)
5723 & -sizeof (PTRACE_XFER_TYPE
));
5724 buf
= (char *) alloca (size
);
5725 memset (buf
, 0, size
);
5727 if (the_low_target
.collect_ptrace_register
)
5728 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5730 collect_register (regcache
, regno
, buf
);
5732 pid
= lwpid_of (current_thread
);
5733 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5736 ptrace (PTRACE_POKEUSER
, pid
,
5737 /* Coerce to a uintptr_t first to avoid potential gcc warning
5738 about coercing an 8 byte integer to a 4 byte pointer. */
5739 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5740 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5743 /* At this point, ESRCH should mean the process is
5744 already gone, in which case we simply ignore attempts
5745 to change its registers. See also the related
5746 comment in linux_resume_one_lwp. */
5750 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5751 error ("writing register %d: %s", regno
, strerror (errno
));
5753 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5757 /* Fetch all registers, or just one, from the child process.
5758 If REGNO is -1, do this for all registers, skipping any that are
5759 assumed to have been retrieved by regsets_fetch_inferior_registers,
5760 unless ALL is non-zero.
5761 Otherwise, REGNO specifies which register (so we can save time). */
5763 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5764 struct regcache
*regcache
, int regno
, int all
)
5766 struct usrregs_info
*usr
= regs_info
->usrregs
;
5770 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5771 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5772 fetch_register (usr
, regcache
, regno
);
5775 fetch_register (usr
, regcache
, regno
);
5778 /* Store our register values back into the inferior.
5779 If REGNO is -1, do this for all registers, skipping any that are
5780 assumed to have been saved by regsets_store_inferior_registers,
5781 unless ALL is non-zero.
5782 Otherwise, REGNO specifies which register (so we can save time). */
5784 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5785 struct regcache
*regcache
, int regno
, int all
)
5787 struct usrregs_info
*usr
= regs_info
->usrregs
;
5791 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5792 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5793 store_register (usr
, regcache
, regno
);
5796 store_register (usr
, regcache
, regno
);
5799 #else /* !HAVE_LINUX_USRREGS */
5801 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5802 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5808 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5812 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5816 if (the_low_target
.fetch_register
!= NULL
5817 && regs_info
->usrregs
!= NULL
)
5818 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5819 (*the_low_target
.fetch_register
) (regcache
, regno
);
5821 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5822 if (regs_info
->usrregs
!= NULL
)
5823 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5827 if (the_low_target
.fetch_register
!= NULL
5828 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5831 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5833 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5835 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5836 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5841 linux_store_registers (struct regcache
*regcache
, int regno
)
5845 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5849 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5851 if (regs_info
->usrregs
!= NULL
)
5852 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5856 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5858 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5860 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5861 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5866 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5867 to debugger memory starting at MYADDR. */
5870 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5872 int pid
= lwpid_of (current_thread
);
5873 PTRACE_XFER_TYPE
*buffer
;
5881 /* Try using /proc. Don't bother for one word. */
5882 if (len
>= 3 * sizeof (long))
5886 /* We could keep this file open and cache it - possibly one per
5887 thread. That requires some juggling, but is even faster. */
5888 sprintf (filename
, "/proc/%d/mem", pid
);
5889 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5893 /* If pread64 is available, use it. It's faster if the kernel
5894 supports it (only one syscall), and it's 64-bit safe even on
5895 32-bit platforms (for instance, SPARC debugging a SPARC64
5898 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5901 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5902 bytes
= read (fd
, myaddr
, len
);
5909 /* Some data was read, we'll try to get the rest with ptrace. */
5919 /* Round starting address down to longword boundary. */
5920 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5921 /* Round ending address up; get number of longwords that makes. */
5922 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5923 / sizeof (PTRACE_XFER_TYPE
));
5924 /* Allocate buffer of that many longwords. */
5925 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5927 /* Read all the longwords */
5929 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5931 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5932 about coercing an 8 byte integer to a 4 byte pointer. */
5933 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5934 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5935 (PTRACE_TYPE_ARG4
) 0);
5941 /* Copy appropriate bytes out of the buffer. */
5944 i
*= sizeof (PTRACE_XFER_TYPE
);
5945 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5947 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5954 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5955 memory at MEMADDR. On failure (cannot write to the inferior)
5956 returns the value of errno. Always succeeds if LEN is zero. */
5959 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5962 /* Round starting address down to longword boundary. */
5963 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5964 /* Round ending address up; get number of longwords that makes. */
5966 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5967 / sizeof (PTRACE_XFER_TYPE
);
5969 /* Allocate buffer of that many longwords. */
5970 PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5972 int pid
= lwpid_of (current_thread
);
5976 /* Zero length write always succeeds. */
5982 /* Dump up to four bytes. */
5983 char str
[4 * 2 + 1];
5985 int dump
= len
< 4 ? len
: 4;
5987 for (i
= 0; i
< dump
; i
++)
5989 sprintf (p
, "%02x", myaddr
[i
]);
5994 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5995 str
, (long) memaddr
, pid
);
5998 /* Fill start and end extra bytes of buffer with existing memory data. */
6001 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
6002 about coercing an 8 byte integer to a 4 byte pointer. */
6003 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
6004 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
6005 (PTRACE_TYPE_ARG4
) 0);
6013 = ptrace (PTRACE_PEEKTEXT
, pid
,
6014 /* Coerce to a uintptr_t first to avoid potential gcc warning
6015 about coercing an 8 byte integer to a 4 byte pointer. */
6016 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
6017 * sizeof (PTRACE_XFER_TYPE
)),
6018 (PTRACE_TYPE_ARG4
) 0);
6023 /* Copy data to be written over corresponding part of buffer. */
6025 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
6028 /* Write the entire buffer. */
6030 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
6033 ptrace (PTRACE_POKETEXT
, pid
,
6034 /* Coerce to a uintptr_t first to avoid potential gcc warning
6035 about coercing an 8 byte integer to a 4 byte pointer. */
6036 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
6037 (PTRACE_TYPE_ARG4
) buffer
[i
]);
6046 linux_look_up_symbols (void)
6048 #ifdef USE_THREAD_DB
6049 struct process_info
*proc
= current_process ();
6051 if (proc
->priv
->thread_db
!= NULL
)
6059 linux_request_interrupt (void)
6061 /* Send a SIGINT to the process group. This acts just like the user
6062 typed a ^C on the controlling terminal. */
6063 kill (-signal_pid
, SIGINT
);
6066 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
6067 to debugger memory starting at MYADDR. */
6070 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
6072 char filename
[PATH_MAX
];
6074 int pid
= lwpid_of (current_thread
);
6076 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6078 fd
= open (filename
, O_RDONLY
);
6082 if (offset
!= (CORE_ADDR
) 0
6083 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6086 n
= read (fd
, myaddr
, len
);
6093 /* These breakpoint and watchpoint related wrapper functions simply
6094 pass on the function call if the target has registered a
6095 corresponding function. */
6098 linux_supports_z_point_type (char z_type
)
6100 return (the_low_target
.supports_z_point_type
!= NULL
6101 && the_low_target
.supports_z_point_type (z_type
));
6105 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6106 int size
, struct raw_breakpoint
*bp
)
6108 if (type
== raw_bkpt_type_sw
)
6109 return insert_memory_breakpoint (bp
);
6110 else if (the_low_target
.insert_point
!= NULL
)
6111 return the_low_target
.insert_point (type
, addr
, size
, bp
);
6113 /* Unsupported (see target.h). */
6118 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6119 int size
, struct raw_breakpoint
*bp
)
6121 if (type
== raw_bkpt_type_sw
)
6122 return remove_memory_breakpoint (bp
);
6123 else if (the_low_target
.remove_point
!= NULL
)
6124 return the_low_target
.remove_point (type
, addr
, size
, bp
);
6126 /* Unsupported (see target.h). */
6130 /* Implement the to_stopped_by_sw_breakpoint target_ops
6134 linux_stopped_by_sw_breakpoint (void)
6136 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6138 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
6141 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
6145 linux_supports_stopped_by_sw_breakpoint (void)
6147 return USE_SIGTRAP_SIGINFO
;
6150 /* Implement the to_stopped_by_hw_breakpoint target_ops
6154 linux_stopped_by_hw_breakpoint (void)
6156 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6158 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6161 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6165 linux_supports_stopped_by_hw_breakpoint (void)
6167 return USE_SIGTRAP_SIGINFO
;
6170 /* Implement the supports_hardware_single_step target_ops method. */
6173 linux_supports_hardware_single_step (void)
6175 return can_hardware_single_step ();
6179 linux_supports_software_single_step (void)
6181 return can_software_single_step ();
6185 linux_stopped_by_watchpoint (void)
6187 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6189 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6193 linux_stopped_data_address (void)
6195 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6197 return lwp
->stopped_data_address
;
6200 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6201 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6202 && defined(PT_TEXT_END_ADDR)
6204 /* This is only used for targets that define PT_TEXT_ADDR,
6205 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6206 the target has different ways of acquiring this information, like
6209 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6210 to tell gdb about. */
6213 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6215 unsigned long text
, text_end
, data
;
6216 int pid
= lwpid_of (current_thread
);
6220 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6221 (PTRACE_TYPE_ARG4
) 0);
6222 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6223 (PTRACE_TYPE_ARG4
) 0);
6224 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6225 (PTRACE_TYPE_ARG4
) 0);
6229 /* Both text and data offsets produced at compile-time (and so
6230 used by gdb) are relative to the beginning of the program,
6231 with the data segment immediately following the text segment.
6232 However, the actual runtime layout in memory may put the data
6233 somewhere else, so when we send gdb a data base-address, we
6234 use the real data base address and subtract the compile-time
6235 data base-address from it (which is just the length of the
6236 text segment). BSS immediately follows data in both
6239 *data_p
= data
- (text_end
- text
);
6248 linux_qxfer_osdata (const char *annex
,
6249 unsigned char *readbuf
, unsigned const char *writebuf
,
6250 CORE_ADDR offset
, int len
)
6252 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6255 /* Convert a native/host siginfo object, into/from the siginfo in the
6256 layout of the inferiors' architecture. */
6259 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6263 if (the_low_target
.siginfo_fixup
!= NULL
)
6264 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6266 /* If there was no callback, or the callback didn't do anything,
6267 then just do a straight memcpy. */
6271 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6273 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6278 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6279 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6283 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6285 if (current_thread
== NULL
)
6288 pid
= lwpid_of (current_thread
);
6291 debug_printf ("%s siginfo for lwp %d.\n",
6292 readbuf
!= NULL
? "Reading" : "Writing",
6295 if (offset
>= sizeof (siginfo
))
6298 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6301 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6302 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6303 inferior with a 64-bit GDBSERVER should look the same as debugging it
6304 with a 32-bit GDBSERVER, we need to convert it. */
6305 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6307 if (offset
+ len
> sizeof (siginfo
))
6308 len
= sizeof (siginfo
) - offset
;
6310 if (readbuf
!= NULL
)
6311 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6314 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6316 /* Convert back to ptrace layout before flushing it out. */
6317 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6319 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6326 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6327 so we notice when children change state; as the handler for the
6328 sigsuspend in my_waitpid. */
6331 sigchld_handler (int signo
)
6333 int old_errno
= errno
;
6339 /* fprintf is not async-signal-safe, so call write
6341 if (write (2, "sigchld_handler\n",
6342 sizeof ("sigchld_handler\n") - 1) < 0)
6343 break; /* just ignore */
6347 if (target_is_async_p ())
6348 async_file_mark (); /* trigger a linux_wait */
6354 linux_supports_non_stop (void)
6360 linux_async (int enable
)
6362 int previous
= target_is_async_p ();
6365 debug_printf ("linux_async (%d), previous=%d\n",
6368 if (previous
!= enable
)
6371 sigemptyset (&mask
);
6372 sigaddset (&mask
, SIGCHLD
);
6374 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6378 if (pipe (linux_event_pipe
) == -1)
6380 linux_event_pipe
[0] = -1;
6381 linux_event_pipe
[1] = -1;
6382 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6384 warning ("creating event pipe failed.");
6388 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6389 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6391 /* Register the event loop handler. */
6392 add_file_handler (linux_event_pipe
[0],
6393 handle_target_event
, NULL
);
6395 /* Always trigger a linux_wait. */
6400 delete_file_handler (linux_event_pipe
[0]);
6402 close (linux_event_pipe
[0]);
6403 close (linux_event_pipe
[1]);
6404 linux_event_pipe
[0] = -1;
6405 linux_event_pipe
[1] = -1;
6408 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6415 linux_start_non_stop (int nonstop
)
6417 /* Register or unregister from event-loop accordingly. */
6418 linux_async (nonstop
);
6420 if (target_is_async_p () != (nonstop
!= 0))
6427 linux_supports_multi_process (void)
6432 /* Check if fork events are supported. */
6435 linux_supports_fork_events (void)
6437 return linux_supports_tracefork ();
6440 /* Check if vfork events are supported. */
6443 linux_supports_vfork_events (void)
6445 return linux_supports_tracefork ();
6448 /* Check if exec events are supported. */
6451 linux_supports_exec_events (void)
6453 return linux_supports_traceexec ();
6456 /* Callback for 'find_inferior'. Set the (possibly changed) ptrace
6457 options for the specified lwp. */
6460 reset_lwp_ptrace_options_callback (struct inferior_list_entry
*entry
,
6463 struct thread_info
*thread
= (struct thread_info
*) entry
;
6464 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6468 /* Stop the lwp so we can modify its ptrace options. */
6469 lwp
->must_set_ptrace_flags
= 1;
6470 linux_stop_lwp (lwp
);
6474 /* Already stopped; go ahead and set the ptrace options. */
6475 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6476 int options
= linux_low_ptrace_options (proc
->attached
);
6478 linux_enable_event_reporting (lwpid_of (thread
), options
);
6479 lwp
->must_set_ptrace_flags
= 0;
6485 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6486 ptrace flags for all inferiors. This is in case the new GDB connection
6487 doesn't support the same set of events that the previous one did. */
6490 linux_handle_new_gdb_connection (void)
6494 /* Request that all the lwps reset their ptrace options. */
6495 find_inferior (&all_threads
, reset_lwp_ptrace_options_callback
, &pid
);
6499 linux_supports_disable_randomization (void)
6501 #ifdef HAVE_PERSONALITY
6509 linux_supports_agent (void)
6515 linux_supports_range_stepping (void)
6517 if (can_software_single_step ())
6519 if (*the_low_target
.supports_range_stepping
== NULL
)
6522 return (*the_low_target
.supports_range_stepping
) ();
6525 /* Enumerate spufs IDs for process PID. */
6527 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6533 struct dirent
*entry
;
6535 sprintf (path
, "/proc/%ld/fd", pid
);
6536 dir
= opendir (path
);
6541 while ((entry
= readdir (dir
)) != NULL
)
6547 fd
= atoi (entry
->d_name
);
6551 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6552 if (stat (path
, &st
) != 0)
6554 if (!S_ISDIR (st
.st_mode
))
6557 if (statfs (path
, &stfs
) != 0)
6559 if (stfs
.f_type
!= SPUFS_MAGIC
)
6562 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6564 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6574 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6575 object type, using the /proc file system. */
6577 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6578 unsigned const char *writebuf
,
6579 CORE_ADDR offset
, int len
)
6581 long pid
= lwpid_of (current_thread
);
6586 if (!writebuf
&& !readbuf
)
6594 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6597 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6598 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6603 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6610 ret
= write (fd
, writebuf
, (size_t) len
);
6612 ret
= read (fd
, readbuf
, (size_t) len
);
6618 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6619 struct target_loadseg
6621 /* Core address to which the segment is mapped. */
6623 /* VMA recorded in the program header. */
6625 /* Size of this segment in memory. */
6629 # if defined PT_GETDSBT
6630 struct target_loadmap
6632 /* Protocol version number, must be zero. */
6634 /* Pointer to the DSBT table, its size, and the DSBT index. */
6635 unsigned *dsbt_table
;
6636 unsigned dsbt_size
, dsbt_index
;
6637 /* Number of segments in this map. */
6639 /* The actual memory map. */
6640 struct target_loadseg segs
[/*nsegs*/];
6642 # define LINUX_LOADMAP PT_GETDSBT
6643 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6644 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6646 struct target_loadmap
6648 /* Protocol version number, must be zero. */
6650 /* Number of segments in this map. */
6652 /* The actual memory map. */
6653 struct target_loadseg segs
[/*nsegs*/];
6655 # define LINUX_LOADMAP PTRACE_GETFDPIC
6656 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6657 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6661 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6662 unsigned char *myaddr
, unsigned int len
)
6664 int pid
= lwpid_of (current_thread
);
6666 struct target_loadmap
*data
= NULL
;
6667 unsigned int actual_length
, copy_length
;
6669 if (strcmp (annex
, "exec") == 0)
6670 addr
= (int) LINUX_LOADMAP_EXEC
;
6671 else if (strcmp (annex
, "interp") == 0)
6672 addr
= (int) LINUX_LOADMAP_INTERP
;
6676 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6682 actual_length
= sizeof (struct target_loadmap
)
6683 + sizeof (struct target_loadseg
) * data
->nsegs
;
6685 if (offset
< 0 || offset
> actual_length
)
6688 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6689 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6693 # define linux_read_loadmap NULL
6694 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6697 linux_process_qsupported (char **features
, int count
)
6699 if (the_low_target
.process_qsupported
!= NULL
)
6700 the_low_target
.process_qsupported (features
, count
);
6704 linux_supports_catch_syscall (void)
6706 return (the_low_target
.get_syscall_trapinfo
!= NULL
6707 && linux_supports_tracesysgood ());
6711 linux_get_ipa_tdesc_idx (void)
6713 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6716 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6720 linux_supports_tracepoints (void)
6722 if (*the_low_target
.supports_tracepoints
== NULL
)
6725 return (*the_low_target
.supports_tracepoints
) ();
6729 linux_read_pc (struct regcache
*regcache
)
6731 if (the_low_target
.get_pc
== NULL
)
6734 return (*the_low_target
.get_pc
) (regcache
);
6738 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6740 gdb_assert (the_low_target
.set_pc
!= NULL
);
6742 (*the_low_target
.set_pc
) (regcache
, pc
);
6746 linux_thread_stopped (struct thread_info
*thread
)
6748 return get_thread_lwp (thread
)->stopped
;
6751 /* This exposes stop-all-threads functionality to other modules. */
6754 linux_pause_all (int freeze
)
6756 stop_all_lwps (freeze
, NULL
);
6759 /* This exposes unstop-all-threads functionality to other gdbserver
6763 linux_unpause_all (int unfreeze
)
6765 unstop_all_lwps (unfreeze
, NULL
);
6769 linux_prepare_to_access_memory (void)
6771 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6774 linux_pause_all (1);
6779 linux_done_accessing_memory (void)
6781 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6784 linux_unpause_all (1);
6788 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6789 CORE_ADDR collector
,
6792 CORE_ADDR
*jump_entry
,
6793 CORE_ADDR
*trampoline
,
6794 ULONGEST
*trampoline_size
,
6795 unsigned char *jjump_pad_insn
,
6796 ULONGEST
*jjump_pad_insn_size
,
6797 CORE_ADDR
*adjusted_insn_addr
,
6798 CORE_ADDR
*adjusted_insn_addr_end
,
6801 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6802 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6803 jump_entry
, trampoline
, trampoline_size
,
6804 jjump_pad_insn
, jjump_pad_insn_size
,
6805 adjusted_insn_addr
, adjusted_insn_addr_end
,
6809 static struct emit_ops
*
6810 linux_emit_ops (void)
6812 if (the_low_target
.emit_ops
!= NULL
)
6813 return (*the_low_target
.emit_ops
) ();
6819 linux_get_min_fast_tracepoint_insn_len (void)
6821 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6824 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6827 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6828 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6830 char filename
[PATH_MAX
];
6832 const int auxv_size
= is_elf64
6833 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6834 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6836 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6838 fd
= open (filename
, O_RDONLY
);
6844 while (read (fd
, buf
, auxv_size
) == auxv_size
6845 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6849 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6851 switch (aux
->a_type
)
6854 *phdr_memaddr
= aux
->a_un
.a_val
;
6857 *num_phdr
= aux
->a_un
.a_val
;
6863 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6865 switch (aux
->a_type
)
6868 *phdr_memaddr
= aux
->a_un
.a_val
;
6871 *num_phdr
= aux
->a_un
.a_val
;
6879 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6881 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6882 "phdr_memaddr = %ld, phdr_num = %d",
6883 (long) *phdr_memaddr
, *num_phdr
);
6890 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6893 get_dynamic (const int pid
, const int is_elf64
)
6895 CORE_ADDR phdr_memaddr
, relocation
;
6897 unsigned char *phdr_buf
;
6898 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6900 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6903 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6904 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6906 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6909 /* Compute relocation: it is expected to be 0 for "regular" executables,
6910 non-zero for PIE ones. */
6912 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6915 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6917 if (p
->p_type
== PT_PHDR
)
6918 relocation
= phdr_memaddr
- p
->p_vaddr
;
6922 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6924 if (p
->p_type
== PT_PHDR
)
6925 relocation
= phdr_memaddr
- p
->p_vaddr
;
6928 if (relocation
== -1)
6930 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6931 any real world executables, including PIE executables, have always
6932 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6933 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6934 or present DT_DEBUG anyway (fpc binaries are statically linked).
6936 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6938 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6943 for (i
= 0; i
< num_phdr
; i
++)
6947 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6949 if (p
->p_type
== PT_DYNAMIC
)
6950 return p
->p_vaddr
+ relocation
;
6954 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6956 if (p
->p_type
== PT_DYNAMIC
)
6957 return p
->p_vaddr
+ relocation
;
6964 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6965 can be 0 if the inferior does not yet have the library list initialized.
6966 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6967 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6970 get_r_debug (const int pid
, const int is_elf64
)
6972 CORE_ADDR dynamic_memaddr
;
6973 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6974 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6977 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6978 if (dynamic_memaddr
== 0)
6981 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6985 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6986 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6990 unsigned char buf
[sizeof (Elf64_Xword
)];
6994 #ifdef DT_MIPS_RLD_MAP
6995 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6997 if (linux_read_memory (dyn
->d_un
.d_val
,
6998 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7003 #endif /* DT_MIPS_RLD_MAP */
7004 #ifdef DT_MIPS_RLD_MAP_REL
7005 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
7007 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
7008 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7013 #endif /* DT_MIPS_RLD_MAP_REL */
7015 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
7016 map
= dyn
->d_un
.d_val
;
7018 if (dyn
->d_tag
== DT_NULL
)
7023 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
7024 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
7028 unsigned char buf
[sizeof (Elf32_Word
)];
7032 #ifdef DT_MIPS_RLD_MAP
7033 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
7035 if (linux_read_memory (dyn
->d_un
.d_val
,
7036 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7041 #endif /* DT_MIPS_RLD_MAP */
7042 #ifdef DT_MIPS_RLD_MAP_REL
7043 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
7045 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
7046 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7051 #endif /* DT_MIPS_RLD_MAP_REL */
7053 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
7054 map
= dyn
->d_un
.d_val
;
7056 if (dyn
->d_tag
== DT_NULL
)
7060 dynamic_memaddr
+= dyn_size
;
7066 /* Read one pointer from MEMADDR in the inferior. */
7069 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
7073 /* Go through a union so this works on either big or little endian
7074 hosts, when the inferior's pointer size is smaller than the size
7075 of CORE_ADDR. It is assumed the inferior's endianness is the
7076 same of the superior's. */
7079 CORE_ADDR core_addr
;
7084 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
7087 if (ptr_size
== sizeof (CORE_ADDR
))
7088 *ptr
= addr
.core_addr
;
7089 else if (ptr_size
== sizeof (unsigned int))
7092 gdb_assert_not_reached ("unhandled pointer size");
7097 struct link_map_offsets
7099 /* Offset and size of r_debug.r_version. */
7100 int r_version_offset
;
7102 /* Offset and size of r_debug.r_map. */
7105 /* Offset to l_addr field in struct link_map. */
7108 /* Offset to l_name field in struct link_map. */
7111 /* Offset to l_ld field in struct link_map. */
7114 /* Offset to l_next field in struct link_map. */
7117 /* Offset to l_prev field in struct link_map. */
7121 /* Construct qXfer:libraries-svr4:read reply. */
7124 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
7125 unsigned const char *writebuf
,
7126 CORE_ADDR offset
, int len
)
7129 unsigned document_len
;
7130 struct process_info_private
*const priv
= current_process ()->priv
;
7131 char filename
[PATH_MAX
];
7134 static const struct link_map_offsets lmo_32bit_offsets
=
7136 0, /* r_version offset. */
7137 4, /* r_debug.r_map offset. */
7138 0, /* l_addr offset in link_map. */
7139 4, /* l_name offset in link_map. */
7140 8, /* l_ld offset in link_map. */
7141 12, /* l_next offset in link_map. */
7142 16 /* l_prev offset in link_map. */
7145 static const struct link_map_offsets lmo_64bit_offsets
=
7147 0, /* r_version offset. */
7148 8, /* r_debug.r_map offset. */
7149 0, /* l_addr offset in link_map. */
7150 8, /* l_name offset in link_map. */
7151 16, /* l_ld offset in link_map. */
7152 24, /* l_next offset in link_map. */
7153 32 /* l_prev offset in link_map. */
7155 const struct link_map_offsets
*lmo
;
7156 unsigned int machine
;
7158 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7159 int allocated
= 1024;
7161 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7162 int header_done
= 0;
7164 if (writebuf
!= NULL
)
7166 if (readbuf
== NULL
)
7169 pid
= lwpid_of (current_thread
);
7170 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7171 is_elf64
= elf_64_file_p (filename
, &machine
);
7172 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7173 ptr_size
= is_elf64
? 8 : 4;
7175 while (annex
[0] != '\0')
7181 sep
= strchr (annex
, '=');
7186 if (len
== 5 && startswith (annex
, "start"))
7188 else if (len
== 4 && startswith (annex
, "prev"))
7192 annex
= strchr (sep
, ';');
7199 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7206 if (priv
->r_debug
== 0)
7207 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7209 /* We failed to find DT_DEBUG. Such situation will not change
7210 for this inferior - do not retry it. Report it to GDB as
7211 E01, see for the reasons at the GDB solib-svr4.c side. */
7212 if (priv
->r_debug
== (CORE_ADDR
) -1)
7215 if (priv
->r_debug
!= 0)
7217 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7218 (unsigned char *) &r_version
,
7219 sizeof (r_version
)) != 0
7222 warning ("unexpected r_debug version %d", r_version
);
7224 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7225 &lm_addr
, ptr_size
) != 0)
7227 warning ("unable to read r_map from 0x%lx",
7228 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7233 document
= (char *) xmalloc (allocated
);
7234 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7235 p
= document
+ strlen (document
);
7238 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7239 &l_name
, ptr_size
) == 0
7240 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7241 &l_addr
, ptr_size
) == 0
7242 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7243 &l_ld
, ptr_size
) == 0
7244 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7245 &l_prev
, ptr_size
) == 0
7246 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7247 &l_next
, ptr_size
) == 0)
7249 unsigned char libname
[PATH_MAX
];
7251 if (lm_prev
!= l_prev
)
7253 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7254 (long) lm_prev
, (long) l_prev
);
7258 /* Ignore the first entry even if it has valid name as the first entry
7259 corresponds to the main executable. The first entry should not be
7260 skipped if the dynamic loader was loaded late by a static executable
7261 (see solib-svr4.c parameter ignore_first). But in such case the main
7262 executable does not have PT_DYNAMIC present and this function already
7263 exited above due to failed get_r_debug. */
7266 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7271 /* Not checking for error because reading may stop before
7272 we've got PATH_MAX worth of characters. */
7274 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7275 libname
[sizeof (libname
) - 1] = '\0';
7276 if (libname
[0] != '\0')
7278 /* 6x the size for xml_escape_text below. */
7279 size_t len
= 6 * strlen ((char *) libname
);
7284 /* Terminate `<library-list-svr4'. */
7289 while (allocated
< p
- document
+ len
+ 200)
7291 /* Expand to guarantee sufficient storage. */
7292 uintptr_t document_len
= p
- document
;
7294 document
= (char *) xrealloc (document
, 2 * allocated
);
7296 p
= document
+ document_len
;
7299 name
= xml_escape_text ((char *) libname
);
7300 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7301 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7302 name
, (unsigned long) lm_addr
,
7303 (unsigned long) l_addr
, (unsigned long) l_ld
);
7314 /* Empty list; terminate `<library-list-svr4'. */
7318 strcpy (p
, "</library-list-svr4>");
7320 document_len
= strlen (document
);
7321 if (offset
< document_len
)
7322 document_len
-= offset
;
7325 if (len
> document_len
)
7328 memcpy (readbuf
, document
+ offset
, len
);
7334 #ifdef HAVE_LINUX_BTRACE
7336 /* See to_disable_btrace target method. */
7339 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7341 enum btrace_error err
;
7343 err
= linux_disable_btrace (tinfo
);
7344 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7347 /* Encode an Intel Processor Trace configuration. */
7350 linux_low_encode_pt_config (struct buffer
*buffer
,
7351 const struct btrace_data_pt_config
*config
)
7353 buffer_grow_str (buffer
, "<pt-config>\n");
7355 switch (config
->cpu
.vendor
)
7358 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7359 "model=\"%u\" stepping=\"%u\"/>\n",
7360 config
->cpu
.family
, config
->cpu
.model
,
7361 config
->cpu
.stepping
);
7368 buffer_grow_str (buffer
, "</pt-config>\n");
7371 /* Encode a raw buffer. */
7374 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7380 /* We use hex encoding - see common/rsp-low.h. */
7381 buffer_grow_str (buffer
, "<raw>\n");
7387 elem
[0] = tohex ((*data
>> 4) & 0xf);
7388 elem
[1] = tohex (*data
++ & 0xf);
7390 buffer_grow (buffer
, elem
, 2);
7393 buffer_grow_str (buffer
, "</raw>\n");
7396 /* See to_read_btrace target method. */
7399 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7400 enum btrace_read_type type
)
7402 struct btrace_data btrace
;
7403 struct btrace_block
*block
;
7404 enum btrace_error err
;
7407 btrace_data_init (&btrace
);
7409 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7410 if (err
!= BTRACE_ERR_NONE
)
7412 if (err
== BTRACE_ERR_OVERFLOW
)
7413 buffer_grow_str0 (buffer
, "E.Overflow.");
7415 buffer_grow_str0 (buffer
, "E.Generic Error.");
7420 switch (btrace
.format
)
7422 case BTRACE_FORMAT_NONE
:
7423 buffer_grow_str0 (buffer
, "E.No Trace.");
7426 case BTRACE_FORMAT_BTS
:
7427 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7428 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7431 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7433 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7434 paddress (block
->begin
), paddress (block
->end
));
7436 buffer_grow_str0 (buffer
, "</btrace>\n");
7439 case BTRACE_FORMAT_PT
:
7440 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7441 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7442 buffer_grow_str (buffer
, "<pt>\n");
7444 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7446 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7447 btrace
.variant
.pt
.size
);
7449 buffer_grow_str (buffer
, "</pt>\n");
7450 buffer_grow_str0 (buffer
, "</btrace>\n");
7454 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7458 btrace_data_fini (&btrace
);
7462 btrace_data_fini (&btrace
);
7466 /* See to_btrace_conf target method. */
7469 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7470 struct buffer
*buffer
)
7472 const struct btrace_config
*conf
;
7474 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7475 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7477 conf
= linux_btrace_conf (tinfo
);
7480 switch (conf
->format
)
7482 case BTRACE_FORMAT_NONE
:
7485 case BTRACE_FORMAT_BTS
:
7486 buffer_xml_printf (buffer
, "<bts");
7487 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7488 buffer_xml_printf (buffer
, " />\n");
7491 case BTRACE_FORMAT_PT
:
7492 buffer_xml_printf (buffer
, "<pt");
7493 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7494 buffer_xml_printf (buffer
, "/>\n");
7499 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7502 #endif /* HAVE_LINUX_BTRACE */
7504 /* See nat/linux-nat.h. */
7507 current_lwp_ptid (void)
7509 return ptid_of (current_thread
);
7512 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7515 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7517 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7518 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7520 return default_breakpoint_kind_from_pc (pcptr
);
7523 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7525 static const gdb_byte
*
7526 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7528 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7530 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7533 /* Implementation of the target_ops method
7534 "breakpoint_kind_from_current_state". */
7537 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7539 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7540 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7542 return linux_breakpoint_kind_from_pc (pcptr
);
7545 /* Default implementation of linux_target_ops method "set_pc" for
7546 32-bit pc register which is literally named "pc". */
7549 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7551 uint32_t newpc
= pc
;
7553 supply_register_by_name (regcache
, "pc", &newpc
);
7556 /* Default implementation of linux_target_ops method "get_pc" for
7557 32-bit pc register which is literally named "pc". */
7560 linux_get_pc_32bit (struct regcache
*regcache
)
7564 collect_register_by_name (regcache
, "pc", &pc
);
7566 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7570 /* Default implementation of linux_target_ops method "set_pc" for
7571 64-bit pc register which is literally named "pc". */
7574 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7576 uint64_t newpc
= pc
;
7578 supply_register_by_name (regcache
, "pc", &newpc
);
7581 /* Default implementation of linux_target_ops method "get_pc" for
7582 64-bit pc register which is literally named "pc". */
7585 linux_get_pc_64bit (struct regcache
*regcache
)
7589 collect_register_by_name (regcache
, "pc", &pc
);
7591 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7596 static struct target_ops linux_target_ops
= {
7597 linux_create_inferior
,
7598 linux_post_create_inferior
,
7607 linux_fetch_registers
,
7608 linux_store_registers
,
7609 linux_prepare_to_access_memory
,
7610 linux_done_accessing_memory
,
7613 linux_look_up_symbols
,
7614 linux_request_interrupt
,
7616 linux_supports_z_point_type
,
7619 linux_stopped_by_sw_breakpoint
,
7620 linux_supports_stopped_by_sw_breakpoint
,
7621 linux_stopped_by_hw_breakpoint
,
7622 linux_supports_stopped_by_hw_breakpoint
,
7623 linux_supports_hardware_single_step
,
7624 linux_stopped_by_watchpoint
,
7625 linux_stopped_data_address
,
7626 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7627 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7628 && defined(PT_TEXT_END_ADDR)
7633 #ifdef USE_THREAD_DB
7634 thread_db_get_tls_address
,
7639 hostio_last_error_from_errno
,
7642 linux_supports_non_stop
,
7644 linux_start_non_stop
,
7645 linux_supports_multi_process
,
7646 linux_supports_fork_events
,
7647 linux_supports_vfork_events
,
7648 linux_supports_exec_events
,
7649 linux_handle_new_gdb_connection
,
7650 #ifdef USE_THREAD_DB
7651 thread_db_handle_monitor_command
,
7655 linux_common_core_of_thread
,
7657 linux_process_qsupported
,
7658 linux_supports_tracepoints
,
7661 linux_thread_stopped
,
7665 linux_stabilize_threads
,
7666 linux_install_fast_tracepoint_jump_pad
,
7668 linux_supports_disable_randomization
,
7669 linux_get_min_fast_tracepoint_insn_len
,
7670 linux_qxfer_libraries_svr4
,
7671 linux_supports_agent
,
7672 #ifdef HAVE_LINUX_BTRACE
7673 linux_supports_btrace
,
7674 linux_enable_btrace
,
7675 linux_low_disable_btrace
,
7676 linux_low_read_btrace
,
7677 linux_low_btrace_conf
,
7685 linux_supports_range_stepping
,
7686 linux_proc_pid_to_exec_file
,
7687 linux_mntns_open_cloexec
,
7689 linux_mntns_readlink
,
7690 linux_breakpoint_kind_from_pc
,
7691 linux_sw_breakpoint_from_kind
,
7692 linux_proc_tid_get_name
,
7693 linux_breakpoint_kind_from_current_state
,
7694 linux_supports_software_single_step
,
7695 linux_supports_catch_syscall
,
7696 linux_get_ipa_tdesc_idx
,
7699 #ifdef HAVE_LINUX_REGSETS
7701 initialize_regsets_info (struct regsets_info
*info
)
7703 for (info
->num_regsets
= 0;
7704 info
->regsets
[info
->num_regsets
].size
>= 0;
7705 info
->num_regsets
++)
7711 initialize_low (void)
7713 struct sigaction sigchld_action
;
7715 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7716 set_target_ops (&linux_target_ops
);
7718 linux_ptrace_init_warnings ();
7720 sigchld_action
.sa_handler
= sigchld_handler
;
7721 sigemptyset (&sigchld_action
.sa_mask
);
7722 sigchld_action
.sa_flags
= SA_RESTART
;
7723 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7725 initialize_low_arch ();
7727 linux_check_ptrace_features ();