1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2016 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"
51 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
52 then ELFMAG0 will have been defined. If it didn't get included by
53 gdb_proc_service.h then including it will likely introduce a duplicate
54 definition of elf_fpregset_t. */
57 #include "nat/linux-namespaces.h"
60 #define SPUFS_MAGIC 0x23c9b64e
63 #ifdef HAVE_PERSONALITY
64 # include <sys/personality.h>
65 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
66 # define ADDR_NO_RANDOMIZE 0x0040000
74 /* Some targets did not define these ptrace constants from the start,
75 so gdbserver defines them locally here. In the future, these may
76 be removed after they are added to asm/ptrace.h. */
77 #if !(defined(PT_TEXT_ADDR) \
78 || defined(PT_DATA_ADDR) \
79 || defined(PT_TEXT_END_ADDR))
80 #if defined(__mcoldfire__)
81 /* These are still undefined in 3.10 kernels. */
82 #define PT_TEXT_ADDR 49*4
83 #define PT_DATA_ADDR 50*4
84 #define PT_TEXT_END_ADDR 51*4
85 /* BFIN already defines these since at least 2.6.32 kernels. */
87 #define PT_TEXT_ADDR 220
88 #define PT_TEXT_END_ADDR 224
89 #define PT_DATA_ADDR 228
90 /* These are still undefined in 3.10 kernels. */
91 #elif defined(__TMS320C6X__)
92 #define PT_TEXT_ADDR (0x10000*4)
93 #define PT_DATA_ADDR (0x10004*4)
94 #define PT_TEXT_END_ADDR (0x10008*4)
98 #ifdef HAVE_LINUX_BTRACE
99 # include "nat/linux-btrace.h"
100 # include "btrace-common.h"
103 #ifndef HAVE_ELF32_AUXV_T
104 /* Copied from glibc's elf.h. */
107 uint32_t a_type
; /* Entry type */
110 uint32_t a_val
; /* Integer value */
111 /* We use to have pointer elements added here. We cannot do that,
112 though, since it does not work when using 32-bit definitions
113 on 64-bit platforms and vice versa. */
118 #ifndef HAVE_ELF64_AUXV_T
119 /* Copied from glibc's elf.h. */
122 uint64_t a_type
; /* Entry type */
125 uint64_t a_val
; /* Integer value */
126 /* We use to have pointer elements added here. We cannot do that,
127 though, since it does not work when using 32-bit definitions
128 on 64-bit platforms and vice versa. */
133 /* Does the current host support PTRACE_GETREGSET? */
134 int have_ptrace_getregset
= -1;
138 /* See nat/linux-nat.h. */
141 ptid_of_lwp (struct lwp_info
*lwp
)
143 return ptid_of (get_lwp_thread (lwp
));
146 /* See nat/linux-nat.h. */
149 lwp_set_arch_private_info (struct lwp_info
*lwp
,
150 struct arch_lwp_info
*info
)
152 lwp
->arch_private
= info
;
155 /* See nat/linux-nat.h. */
157 struct arch_lwp_info
*
158 lwp_arch_private_info (struct lwp_info
*lwp
)
160 return lwp
->arch_private
;
163 /* See nat/linux-nat.h. */
166 lwp_is_stopped (struct lwp_info
*lwp
)
171 /* See nat/linux-nat.h. */
173 enum target_stop_reason
174 lwp_stop_reason (struct lwp_info
*lwp
)
176 return lwp
->stop_reason
;
179 /* A list of all unknown processes which receive stop signals. Some
180 other process will presumably claim each of these as forked
181 children momentarily. */
183 struct simple_pid_list
185 /* The process ID. */
188 /* The status as reported by waitpid. */
192 struct simple_pid_list
*next
;
194 struct simple_pid_list
*stopped_pids
;
196 /* Trivial list manipulation functions to keep track of a list of new
197 stopped processes. */
200 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
202 struct simple_pid_list
*new_pid
= XNEW (struct simple_pid_list
);
205 new_pid
->status
= status
;
206 new_pid
->next
= *listp
;
211 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
213 struct simple_pid_list
**p
;
215 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
216 if ((*p
)->pid
== pid
)
218 struct simple_pid_list
*next
= (*p
)->next
;
220 *statusp
= (*p
)->status
;
228 enum stopping_threads_kind
230 /* Not stopping threads presently. */
231 NOT_STOPPING_THREADS
,
233 /* Stopping threads. */
236 /* Stopping and suspending threads. */
237 STOPPING_AND_SUSPENDING_THREADS
240 /* This is set while stop_all_lwps is in effect. */
241 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
243 /* FIXME make into a target method? */
244 int using_threads
= 1;
246 /* True if we're presently stabilizing threads (moving them out of
248 static int stabilizing_threads
;
250 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
251 int step
, int signal
, siginfo_t
*info
);
252 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
253 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
254 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
255 static void unsuspend_all_lwps (struct lwp_info
*except
);
256 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
257 int *wstat
, int options
);
258 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
259 static struct lwp_info
*add_lwp (ptid_t ptid
);
260 static void linux_mourn (struct process_info
*process
);
261 static int linux_stopped_by_watchpoint (void);
262 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
263 static int lwp_is_marked_dead (struct lwp_info
*lwp
);
264 static void proceed_all_lwps (void);
265 static int finish_step_over (struct lwp_info
*lwp
);
266 static int kill_lwp (unsigned long lwpid
, int signo
);
267 static void enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
);
268 static void complete_ongoing_step_over (void);
269 static int linux_low_ptrace_options (int attached
);
270 static int check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
);
271 static int proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
);
273 /* When the event-loop is doing a step-over, this points at the thread
275 ptid_t step_over_bkpt
;
277 /* True if the low target can hardware single-step. */
280 can_hardware_single_step (void)
282 if (the_low_target
.supports_hardware_single_step
!= NULL
)
283 return the_low_target
.supports_hardware_single_step ();
288 /* True if the low target can software single-step. Such targets
289 implement the GET_NEXT_PCS callback. */
292 can_software_single_step (void)
294 return (the_low_target
.get_next_pcs
!= NULL
);
297 /* True if the low target supports memory breakpoints. If so, we'll
298 have a GET_PC implementation. */
301 supports_breakpoints (void)
303 return (the_low_target
.get_pc
!= NULL
);
306 /* Returns true if this target can support fast tracepoints. This
307 does not mean that the in-process agent has been loaded in the
311 supports_fast_tracepoints (void)
313 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
316 /* True if LWP is stopped in its stepping range. */
319 lwp_in_step_range (struct lwp_info
*lwp
)
321 CORE_ADDR pc
= lwp
->stop_pc
;
323 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
326 struct pending_signals
330 struct pending_signals
*prev
;
333 /* The read/write ends of the pipe registered as waitable file in the
335 static int linux_event_pipe
[2] = { -1, -1 };
337 /* True if we're currently in async mode. */
338 #define target_is_async_p() (linux_event_pipe[0] != -1)
340 static void send_sigstop (struct lwp_info
*lwp
);
341 static void wait_for_sigstop (void);
343 /* Return non-zero if HEADER is a 64-bit ELF file. */
346 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
348 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
349 && header
->e_ident
[EI_MAG1
] == ELFMAG1
350 && header
->e_ident
[EI_MAG2
] == ELFMAG2
351 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
353 *machine
= header
->e_machine
;
354 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
361 /* Return non-zero if FILE is a 64-bit ELF file,
362 zero if the file is not a 64-bit ELF file,
363 and -1 if the file is not accessible or doesn't exist. */
366 elf_64_file_p (const char *file
, unsigned int *machine
)
371 fd
= open (file
, O_RDONLY
);
375 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
382 return elf_64_header_p (&header
, machine
);
385 /* Accepts an integer PID; Returns true if the executable PID is
386 running is a 64-bit ELF file.. */
389 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
393 sprintf (file
, "/proc/%d/exe", pid
);
394 return elf_64_file_p (file
, machine
);
398 delete_lwp (struct lwp_info
*lwp
)
400 struct thread_info
*thr
= get_lwp_thread (lwp
);
403 debug_printf ("deleting %ld\n", lwpid_of (thr
));
406 free (lwp
->arch_private
);
410 /* Add a process to the common process list, and set its private
413 static struct process_info
*
414 linux_add_process (int pid
, int attached
)
416 struct process_info
*proc
;
418 proc
= add_process (pid
, attached
);
419 proc
->priv
= XCNEW (struct process_info_private
);
421 if (the_low_target
.new_process
!= NULL
)
422 proc
->priv
->arch_private
= the_low_target
.new_process ();
427 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
429 /* Call the target arch_setup function on the current thread. */
432 linux_arch_setup (void)
434 the_low_target
.arch_setup ();
437 /* Call the target arch_setup function on THREAD. */
440 linux_arch_setup_thread (struct thread_info
*thread
)
442 struct thread_info
*saved_thread
;
444 saved_thread
= current_thread
;
445 current_thread
= thread
;
449 current_thread
= saved_thread
;
452 /* Handle a GNU/Linux extended wait response. If we see a clone,
453 fork, or vfork event, we need to add the new LWP to our list
454 (and return 0 so as not to report the trap to higher layers).
455 If we see an exec event, we will modify ORIG_EVENT_LWP to point
456 to a new LWP representing the new program. */
459 handle_extended_wait (struct lwp_info
**orig_event_lwp
, int wstat
)
461 struct lwp_info
*event_lwp
= *orig_event_lwp
;
462 int event
= linux_ptrace_get_extended_event (wstat
);
463 struct thread_info
*event_thr
= get_lwp_thread (event_lwp
);
464 struct lwp_info
*new_lwp
;
466 gdb_assert (event_lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
468 /* All extended events we currently use are mid-syscall. Only
469 PTRACE_EVENT_STOP is delivered more like a signal-stop, but
470 you have to be using PTRACE_SEIZE to get that. */
471 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
473 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
474 || (event
== PTRACE_EVENT_CLONE
))
477 unsigned long new_pid
;
480 /* Get the pid of the new lwp. */
481 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
484 /* If we haven't already seen the new PID stop, wait for it now. */
485 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
487 /* The new child has a pending SIGSTOP. We can't affect it until it
488 hits the SIGSTOP, but we're already attached. */
490 ret
= my_waitpid (new_pid
, &status
, __WALL
);
493 perror_with_name ("waiting for new child");
494 else if (ret
!= new_pid
)
495 warning ("wait returned unexpected PID %d", ret
);
496 else if (!WIFSTOPPED (status
))
497 warning ("wait returned unexpected status 0x%x", status
);
500 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
502 struct process_info
*parent_proc
;
503 struct process_info
*child_proc
;
504 struct lwp_info
*child_lwp
;
505 struct thread_info
*child_thr
;
506 struct target_desc
*tdesc
;
508 ptid
= ptid_build (new_pid
, new_pid
, 0);
512 debug_printf ("HEW: Got fork event from LWP %ld, "
514 ptid_get_lwp (ptid_of (event_thr
)),
515 ptid_get_pid (ptid
));
518 /* Add the new process to the tables and clone the breakpoint
519 lists of the parent. We need to do this even if the new process
520 will be detached, since we will need the process object and the
521 breakpoints to remove any breakpoints from memory when we
522 detach, and the client side will access registers. */
523 child_proc
= linux_add_process (new_pid
, 0);
524 gdb_assert (child_proc
!= NULL
);
525 child_lwp
= add_lwp (ptid
);
526 gdb_assert (child_lwp
!= NULL
);
527 child_lwp
->stopped
= 1;
528 child_lwp
->must_set_ptrace_flags
= 1;
529 child_lwp
->status_pending_p
= 0;
530 child_thr
= get_lwp_thread (child_lwp
);
531 child_thr
->last_resume_kind
= resume_stop
;
532 child_thr
->last_status
.kind
= TARGET_WAITKIND_STOPPED
;
534 /* If we're suspending all threads, leave this one suspended
535 too. If the fork/clone parent is stepping over a breakpoint,
536 all other threads have been suspended already. Leave the
537 child suspended too. */
538 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
539 || event_lwp
->bp_reinsert
!= 0)
542 debug_printf ("HEW: leaving child suspended\n");
543 child_lwp
->suspended
= 1;
546 parent_proc
= get_thread_process (event_thr
);
547 child_proc
->attached
= parent_proc
->attached
;
549 if (event_lwp
->bp_reinsert
!= 0
550 && can_software_single_step ()
551 && event
== PTRACE_EVENT_VFORK
)
553 /* If we leave reinsert breakpoints there, child will
554 hit it, so uninsert reinsert breakpoints from parent
555 (and child). Once vfork child is done, reinsert
556 them back to parent. */
557 uninsert_reinsert_breakpoints (event_thr
);
560 clone_all_breakpoints (child_thr
, event_thr
);
562 tdesc
= XNEW (struct target_desc
);
563 copy_target_description (tdesc
, parent_proc
->tdesc
);
564 child_proc
->tdesc
= tdesc
;
566 /* Clone arch-specific process data. */
567 if (the_low_target
.new_fork
!= NULL
)
568 the_low_target
.new_fork (parent_proc
, child_proc
);
570 /* Save fork info in the parent thread. */
571 if (event
== PTRACE_EVENT_FORK
)
572 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
573 else if (event
== PTRACE_EVENT_VFORK
)
574 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
576 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
578 /* The status_pending field contains bits denoting the
579 extended event, so when the pending event is handled,
580 the handler will look at lwp->waitstatus. */
581 event_lwp
->status_pending_p
= 1;
582 event_lwp
->status_pending
= wstat
;
584 /* If the parent thread is doing step-over with reinsert
585 breakpoints, the list of reinsert breakpoints are cloned
586 from the parent's. Remove them from the child process.
587 In case of vfork, we'll reinsert them back once vforked
589 if (event_lwp
->bp_reinsert
!= 0
590 && can_software_single_step ())
592 /* The child process is forked and stopped, so it is safe
593 to access its memory without stopping all other threads
594 from other processes. */
595 delete_reinsert_breakpoints (child_thr
);
597 gdb_assert (has_reinsert_breakpoints (event_thr
));
598 gdb_assert (!has_reinsert_breakpoints (child_thr
));
601 /* Report the event. */
606 debug_printf ("HEW: Got clone event "
607 "from LWP %ld, new child is LWP %ld\n",
608 lwpid_of (event_thr
), new_pid
);
610 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
611 new_lwp
= add_lwp (ptid
);
613 /* Either we're going to immediately resume the new thread
614 or leave it stopped. linux_resume_one_lwp is a nop if it
615 thinks the thread is currently running, so set this first
616 before calling linux_resume_one_lwp. */
617 new_lwp
->stopped
= 1;
619 /* If we're suspending all threads, leave this one suspended
620 too. If the fork/clone parent is stepping over a breakpoint,
621 all other threads have been suspended already. Leave the
622 child suspended too. */
623 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
624 || event_lwp
->bp_reinsert
!= 0)
625 new_lwp
->suspended
= 1;
627 /* Normally we will get the pending SIGSTOP. But in some cases
628 we might get another signal delivered to the group first.
629 If we do get another signal, be sure not to lose it. */
630 if (WSTOPSIG (status
) != SIGSTOP
)
632 new_lwp
->stop_expected
= 1;
633 new_lwp
->status_pending_p
= 1;
634 new_lwp
->status_pending
= status
;
636 else if (report_thread_events
)
638 new_lwp
->waitstatus
.kind
= TARGET_WAITKIND_THREAD_CREATED
;
639 new_lwp
->status_pending_p
= 1;
640 new_lwp
->status_pending
= status
;
643 /* Don't report the event. */
646 else if (event
== PTRACE_EVENT_VFORK_DONE
)
648 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
650 if (event_lwp
->bp_reinsert
!= 0 && can_software_single_step ())
652 reinsert_reinsert_breakpoints (event_thr
);
654 gdb_assert (has_reinsert_breakpoints (event_thr
));
657 /* Report the event. */
660 else if (event
== PTRACE_EVENT_EXEC
&& report_exec_events
)
662 struct process_info
*proc
;
663 VEC (int) *syscalls_to_catch
;
669 debug_printf ("HEW: Got exec event from LWP %ld\n",
670 lwpid_of (event_thr
));
673 /* Get the event ptid. */
674 event_ptid
= ptid_of (event_thr
);
675 event_pid
= ptid_get_pid (event_ptid
);
677 /* Save the syscall list from the execing process. */
678 proc
= get_thread_process (event_thr
);
679 syscalls_to_catch
= proc
->syscalls_to_catch
;
680 proc
->syscalls_to_catch
= NULL
;
682 /* Delete the execing process and all its threads. */
684 current_thread
= NULL
;
686 /* Create a new process/lwp/thread. */
687 proc
= linux_add_process (event_pid
, 0);
688 event_lwp
= add_lwp (event_ptid
);
689 event_thr
= get_lwp_thread (event_lwp
);
690 gdb_assert (current_thread
== event_thr
);
691 linux_arch_setup_thread (event_thr
);
693 /* Set the event status. */
694 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
695 event_lwp
->waitstatus
.value
.execd_pathname
696 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
698 /* Mark the exec status as pending. */
699 event_lwp
->stopped
= 1;
700 event_lwp
->status_pending_p
= 1;
701 event_lwp
->status_pending
= wstat
;
702 event_thr
->last_resume_kind
= resume_continue
;
703 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
705 /* Update syscall state in the new lwp, effectively mid-syscall too. */
706 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
708 /* Restore the list to catch. Don't rely on the client, which is free
709 to avoid sending a new list when the architecture doesn't change.
710 Also, for ANY_SYSCALL, the architecture doesn't really matter. */
711 proc
->syscalls_to_catch
= syscalls_to_catch
;
713 /* Report the event. */
714 *orig_event_lwp
= event_lwp
;
718 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
721 /* Return the PC as read from the regcache of LWP, without any
725 get_pc (struct lwp_info
*lwp
)
727 struct thread_info
*saved_thread
;
728 struct regcache
*regcache
;
731 if (the_low_target
.get_pc
== NULL
)
734 saved_thread
= current_thread
;
735 current_thread
= get_lwp_thread (lwp
);
737 regcache
= get_thread_regcache (current_thread
, 1);
738 pc
= (*the_low_target
.get_pc
) (regcache
);
741 debug_printf ("pc is 0x%lx\n", (long) pc
);
743 current_thread
= saved_thread
;
747 /* This function should only be called if LWP got a SYSCALL_SIGTRAP.
748 Fill *SYSNO with the syscall nr trapped. */
751 get_syscall_trapinfo (struct lwp_info
*lwp
, int *sysno
)
753 struct thread_info
*saved_thread
;
754 struct regcache
*regcache
;
756 if (the_low_target
.get_syscall_trapinfo
== NULL
)
758 /* If we cannot get the syscall trapinfo, report an unknown
759 system call number. */
760 *sysno
= UNKNOWN_SYSCALL
;
764 saved_thread
= current_thread
;
765 current_thread
= get_lwp_thread (lwp
);
767 regcache
= get_thread_regcache (current_thread
, 1);
768 (*the_low_target
.get_syscall_trapinfo
) (regcache
, sysno
);
771 debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno
);
773 current_thread
= saved_thread
;
776 static int check_stopped_by_watchpoint (struct lwp_info
*child
);
778 /* Called when the LWP stopped for a signal/trap. If it stopped for a
779 trap check what caused it (breakpoint, watchpoint, trace, etc.),
780 and save the result in the LWP's stop_reason field. If it stopped
781 for a breakpoint, decrement the PC if necessary on the lwp's
782 architecture. Returns true if we now have the LWP's stop PC. */
785 save_stop_reason (struct lwp_info
*lwp
)
788 CORE_ADDR sw_breakpoint_pc
;
789 struct thread_info
*saved_thread
;
790 #if USE_SIGTRAP_SIGINFO
794 if (the_low_target
.get_pc
== NULL
)
798 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
800 /* breakpoint_at reads from the current thread. */
801 saved_thread
= current_thread
;
802 current_thread
= get_lwp_thread (lwp
);
804 #if USE_SIGTRAP_SIGINFO
805 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
806 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
808 if (siginfo
.si_signo
== SIGTRAP
)
810 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
)
811 && GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
813 /* The si_code is ambiguous on this arch -- check debug
815 if (!check_stopped_by_watchpoint (lwp
))
816 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
818 else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
820 /* If we determine the LWP stopped for a SW breakpoint,
821 trust it. Particularly don't check watchpoint
822 registers, because at least on s390, we'd find
823 stopped-by-watchpoint as long as there's a watchpoint
825 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
827 else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
829 /* This can indicate either a hardware breakpoint or
830 hardware watchpoint. Check debug registers. */
831 if (!check_stopped_by_watchpoint (lwp
))
832 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
834 else if (siginfo
.si_code
== TRAP_TRACE
)
836 /* We may have single stepped an instruction that
837 triggered a watchpoint. In that case, on some
838 architectures (such as x86), instead of TRAP_HWBKPT,
839 si_code indicates TRAP_TRACE, and we need to check
840 the debug registers separately. */
841 if (!check_stopped_by_watchpoint (lwp
))
842 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
847 /* We may have just stepped a breakpoint instruction. E.g., in
848 non-stop mode, GDB first tells the thread A to step a range, and
849 then the user inserts a breakpoint inside the range. In that
850 case we need to report the breakpoint PC. */
851 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
852 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
853 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
855 if (hardware_breakpoint_inserted_here (pc
))
856 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
858 if (lwp
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
)
859 check_stopped_by_watchpoint (lwp
);
862 if (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
866 struct thread_info
*thr
= get_lwp_thread (lwp
);
868 debug_printf ("CSBB: %s stopped by software breakpoint\n",
869 target_pid_to_str (ptid_of (thr
)));
872 /* Back up the PC if necessary. */
873 if (pc
!= sw_breakpoint_pc
)
875 struct regcache
*regcache
876 = get_thread_regcache (current_thread
, 1);
877 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
880 /* Update this so we record the correct stop PC below. */
881 pc
= sw_breakpoint_pc
;
883 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
)
887 struct thread_info
*thr
= get_lwp_thread (lwp
);
889 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
890 target_pid_to_str (ptid_of (thr
)));
893 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
897 struct thread_info
*thr
= get_lwp_thread (lwp
);
899 debug_printf ("CSBB: %s stopped by hardware watchpoint\n",
900 target_pid_to_str (ptid_of (thr
)));
903 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
)
907 struct thread_info
*thr
= get_lwp_thread (lwp
);
909 debug_printf ("CSBB: %s stopped by trace\n",
910 target_pid_to_str (ptid_of (thr
)));
915 current_thread
= saved_thread
;
919 static struct lwp_info
*
920 add_lwp (ptid_t ptid
)
922 struct lwp_info
*lwp
;
924 lwp
= XCNEW (struct lwp_info
);
926 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
928 if (the_low_target
.new_thread
!= NULL
)
929 the_low_target
.new_thread (lwp
);
931 lwp
->thread
= add_thread (ptid
, lwp
);
936 /* Start an inferior process and returns its pid.
937 ALLARGS is a vector of program-name and args. */
940 linux_create_inferior (char *program
, char **allargs
)
942 struct lwp_info
*new_lwp
;
945 struct cleanup
*restore_personality
946 = maybe_disable_address_space_randomization (disable_randomization
);
948 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
954 perror_with_name ("fork");
959 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
963 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
964 stdout to stderr so that inferior i/o doesn't corrupt the connection.
965 Also, redirect stdin to /dev/null. */
966 if (remote_connection_is_stdio ())
969 open ("/dev/null", O_RDONLY
);
971 if (write (2, "stdin/stdout redirected\n",
972 sizeof ("stdin/stdout redirected\n") - 1) < 0)
974 /* Errors ignored. */;
978 restore_original_signals_state ();
980 execv (program
, allargs
);
982 execvp (program
, allargs
);
984 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
990 do_cleanups (restore_personality
);
992 linux_add_process (pid
, 0);
994 ptid
= ptid_build (pid
, pid
, 0);
995 new_lwp
= add_lwp (ptid
);
996 new_lwp
->must_set_ptrace_flags
= 1;
1001 /* Implement the post_create_inferior target_ops method. */
1004 linux_post_create_inferior (void)
1006 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
1008 linux_arch_setup ();
1010 if (lwp
->must_set_ptrace_flags
)
1012 struct process_info
*proc
= current_process ();
1013 int options
= linux_low_ptrace_options (proc
->attached
);
1015 linux_enable_event_reporting (lwpid_of (current_thread
), options
);
1016 lwp
->must_set_ptrace_flags
= 0;
1020 /* Attach to an inferior process. Returns 0 on success, ERRNO on
1024 linux_attach_lwp (ptid_t ptid
)
1026 struct lwp_info
*new_lwp
;
1027 int lwpid
= ptid_get_lwp (ptid
);
1029 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
1033 new_lwp
= add_lwp (ptid
);
1035 /* We need to wait for SIGSTOP before being able to make the next
1036 ptrace call on this LWP. */
1037 new_lwp
->must_set_ptrace_flags
= 1;
1039 if (linux_proc_pid_is_stopped (lwpid
))
1042 debug_printf ("Attached to a stopped process\n");
1044 /* The process is definitely stopped. It is in a job control
1045 stop, unless the kernel predates the TASK_STOPPED /
1046 TASK_TRACED distinction, in which case it might be in a
1047 ptrace stop. Make sure it is in a ptrace stop; from there we
1048 can kill it, signal it, et cetera.
1050 First make sure there is a pending SIGSTOP. Since we are
1051 already attached, the process can not transition from stopped
1052 to running without a PTRACE_CONT; so we know this signal will
1053 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1054 probably already in the queue (unless this kernel is old
1055 enough to use TASK_STOPPED for ptrace stops); but since
1056 SIGSTOP is not an RT signal, it can only be queued once. */
1057 kill_lwp (lwpid
, SIGSTOP
);
1059 /* Finally, resume the stopped process. This will deliver the
1060 SIGSTOP (or a higher priority signal, just like normal
1061 PTRACE_ATTACH), which we'll catch later on. */
1062 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1065 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
1066 brings it to a halt.
1068 There are several cases to consider here:
1070 1) gdbserver has already attached to the process and is being notified
1071 of a new thread that is being created.
1072 In this case we should ignore that SIGSTOP and resume the
1073 process. This is handled below by setting stop_expected = 1,
1074 and the fact that add_thread sets last_resume_kind ==
1077 2) This is the first thread (the process thread), and we're attaching
1078 to it via attach_inferior.
1079 In this case we want the process thread to stop.
1080 This is handled by having linux_attach set last_resume_kind ==
1081 resume_stop after we return.
1083 If the pid we are attaching to is also the tgid, we attach to and
1084 stop all the existing threads. Otherwise, we attach to pid and
1085 ignore any other threads in the same group as this pid.
1087 3) GDB is connecting to gdbserver and is requesting an enumeration of all
1089 In this case we want the thread to stop.
1090 FIXME: This case is currently not properly handled.
1091 We should wait for the SIGSTOP but don't. Things work apparently
1092 because enough time passes between when we ptrace (ATTACH) and when
1093 gdb makes the next ptrace call on the thread.
1095 On the other hand, if we are currently trying to stop all threads, we
1096 should treat the new thread as if we had sent it a SIGSTOP. This works
1097 because we are guaranteed that the add_lwp call above added us to the
1098 end of the list, and so the new thread has not yet reached
1099 wait_for_sigstop (but will). */
1100 new_lwp
->stop_expected
= 1;
1105 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
1106 already attached. Returns true if a new LWP is found, false
1110 attach_proc_task_lwp_callback (ptid_t ptid
)
1112 /* Is this a new thread? */
1113 if (find_thread_ptid (ptid
) == NULL
)
1115 int lwpid
= ptid_get_lwp (ptid
);
1119 debug_printf ("Found new lwp %d\n", lwpid
);
1121 err
= linux_attach_lwp (ptid
);
1123 /* Be quiet if we simply raced with the thread exiting. EPERM
1124 is returned if the thread's task still exists, and is marked
1125 as exited or zombie, as well as other conditions, so in that
1126 case, confirm the status in /proc/PID/status. */
1128 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1132 debug_printf ("Cannot attach to lwp %d: "
1133 "thread is gone (%d: %s)\n",
1134 lwpid
, err
, strerror (err
));
1139 warning (_("Cannot attach to lwp %d: %s"),
1141 linux_ptrace_attach_fail_reason_string (ptid
, err
));
1149 static void async_file_mark (void);
1151 /* Attach to PID. If PID is the tgid, attach to it and all
1155 linux_attach (unsigned long pid
)
1157 struct process_info
*proc
;
1158 struct thread_info
*initial_thread
;
1159 ptid_t ptid
= ptid_build (pid
, pid
, 0);
1162 /* Attach to PID. We will check for other threads
1164 err
= linux_attach_lwp (ptid
);
1166 error ("Cannot attach to process %ld: %s",
1167 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
1169 proc
= linux_add_process (pid
, 1);
1171 /* Don't ignore the initial SIGSTOP if we just attached to this
1172 process. It will be collected by wait shortly. */
1173 initial_thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
1174 initial_thread
->last_resume_kind
= resume_stop
;
1176 /* We must attach to every LWP. If /proc is mounted, use that to
1177 find them now. On the one hand, the inferior may be using raw
1178 clone instead of using pthreads. On the other hand, even if it
1179 is using pthreads, GDB may not be connected yet (thread_db needs
1180 to do symbol lookups, through qSymbol). Also, thread_db walks
1181 structures in the inferior's address space to find the list of
1182 threads/LWPs, and those structures may well be corrupted. Note
1183 that once thread_db is loaded, we'll still use it to list threads
1184 and associate pthread info with each LWP. */
1185 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1187 /* GDB will shortly read the xml target description for this
1188 process, to figure out the process' architecture. But the target
1189 description is only filled in when the first process/thread in
1190 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1191 that now, otherwise, if GDB is fast enough, it could read the
1192 target description _before_ that initial stop. */
1195 struct lwp_info
*lwp
;
1197 ptid_t pid_ptid
= pid_to_ptid (pid
);
1199 lwpid
= linux_wait_for_event_filtered (pid_ptid
, pid_ptid
,
1201 gdb_assert (lwpid
> 0);
1203 lwp
= find_lwp_pid (pid_to_ptid (lwpid
));
1205 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGSTOP
)
1207 lwp
->status_pending_p
= 1;
1208 lwp
->status_pending
= wstat
;
1211 initial_thread
->last_resume_kind
= resume_continue
;
1215 gdb_assert (proc
->tdesc
!= NULL
);
1228 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
1230 struct counter
*counter
= (struct counter
*) args
;
1232 if (ptid_get_pid (entry
->id
) == counter
->pid
)
1234 if (++counter
->count
> 1)
1242 last_thread_of_process_p (int pid
)
1244 struct counter counter
= { pid
, 0 };
1246 return (find_inferior (&all_threads
,
1247 second_thread_of_pid_p
, &counter
) == NULL
);
1253 linux_kill_one_lwp (struct lwp_info
*lwp
)
1255 struct thread_info
*thr
= get_lwp_thread (lwp
);
1256 int pid
= lwpid_of (thr
);
1258 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1259 there is no signal context, and ptrace(PTRACE_KILL) (or
1260 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1261 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1262 alternative is to kill with SIGKILL. We only need one SIGKILL
1263 per process, not one for each thread. But since we still support
1264 support debugging programs using raw clone without CLONE_THREAD,
1265 we send one for each thread. For years, we used PTRACE_KILL
1266 only, so we're being a bit paranoid about some old kernels where
1267 PTRACE_KILL might work better (dubious if there are any such, but
1268 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1269 second, and so we're fine everywhere. */
1272 kill_lwp (pid
, SIGKILL
);
1275 int save_errno
= errno
;
1277 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1278 target_pid_to_str (ptid_of (thr
)),
1279 save_errno
? strerror (save_errno
) : "OK");
1283 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1286 int save_errno
= errno
;
1288 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1289 target_pid_to_str (ptid_of (thr
)),
1290 save_errno
? strerror (save_errno
) : "OK");
1294 /* Kill LWP and wait for it to die. */
1297 kill_wait_lwp (struct lwp_info
*lwp
)
1299 struct thread_info
*thr
= get_lwp_thread (lwp
);
1300 int pid
= ptid_get_pid (ptid_of (thr
));
1301 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1306 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1310 linux_kill_one_lwp (lwp
);
1312 /* Make sure it died. Notes:
1314 - The loop is most likely unnecessary.
1316 - We don't use linux_wait_for_event as that could delete lwps
1317 while we're iterating over them. We're not interested in
1318 any pending status at this point, only in making sure all
1319 wait status on the kernel side are collected until the
1322 - We don't use __WALL here as the __WALL emulation relies on
1323 SIGCHLD, and killing a stopped process doesn't generate
1324 one, nor an exit status.
1326 res
= my_waitpid (lwpid
, &wstat
, 0);
1327 if (res
== -1 && errno
== ECHILD
)
1328 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1329 } while (res
> 0 && WIFSTOPPED (wstat
));
1331 /* Even if it was stopped, the child may have already disappeared.
1332 E.g., if it was killed by SIGKILL. */
1333 if (res
< 0 && errno
!= ECHILD
)
1334 perror_with_name ("kill_wait_lwp");
1337 /* Callback for `find_inferior'. Kills an lwp of a given process,
1338 except the leader. */
1341 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1343 struct thread_info
*thread
= (struct thread_info
*) entry
;
1344 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1345 int pid
= * (int *) args
;
1347 if (ptid_get_pid (entry
->id
) != pid
)
1350 /* We avoid killing the first thread here, because of a Linux kernel (at
1351 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1352 the children get a chance to be reaped, it will remain a zombie
1355 if (lwpid_of (thread
) == pid
)
1358 debug_printf ("lkop: is last of process %s\n",
1359 target_pid_to_str (entry
->id
));
1363 kill_wait_lwp (lwp
);
1368 linux_kill (int pid
)
1370 struct process_info
*process
;
1371 struct lwp_info
*lwp
;
1373 process
= find_process_pid (pid
);
1374 if (process
== NULL
)
1377 /* If we're killing a running inferior, make sure it is stopped
1378 first, as PTRACE_KILL will not work otherwise. */
1379 stop_all_lwps (0, NULL
);
1381 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1383 /* See the comment in linux_kill_one_lwp. We did not kill the first
1384 thread in the list, so do so now. */
1385 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1390 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1394 kill_wait_lwp (lwp
);
1396 the_target
->mourn (process
);
1398 /* Since we presently can only stop all lwps of all processes, we
1399 need to unstop lwps of other processes. */
1400 unstop_all_lwps (0, NULL
);
1404 /* Get pending signal of THREAD, for detaching purposes. This is the
1405 signal the thread last stopped for, which we need to deliver to the
1406 thread when detaching, otherwise, it'd be suppressed/lost. */
1409 get_detach_signal (struct thread_info
*thread
)
1411 enum gdb_signal signo
= GDB_SIGNAL_0
;
1413 struct lwp_info
*lp
= get_thread_lwp (thread
);
1415 if (lp
->status_pending_p
)
1416 status
= lp
->status_pending
;
1419 /* If the thread had been suspended by gdbserver, and it stopped
1420 cleanly, then it'll have stopped with SIGSTOP. But we don't
1421 want to deliver that SIGSTOP. */
1422 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1423 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1426 /* Otherwise, we may need to deliver the signal we
1428 status
= lp
->last_status
;
1431 if (!WIFSTOPPED (status
))
1434 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1435 target_pid_to_str (ptid_of (thread
)));
1439 /* Extended wait statuses aren't real SIGTRAPs. */
1440 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1443 debug_printf ("GPS: lwp %s had stopped with extended "
1444 "status: no pending signal\n",
1445 target_pid_to_str (ptid_of (thread
)));
1449 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1451 if (program_signals_p
&& !program_signals
[signo
])
1454 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1455 target_pid_to_str (ptid_of (thread
)),
1456 gdb_signal_to_string (signo
));
1459 else if (!program_signals_p
1460 /* If we have no way to know which signals GDB does not
1461 want to have passed to the program, assume
1462 SIGTRAP/SIGINT, which is GDB's default. */
1463 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1466 debug_printf ("GPS: lwp %s had signal %s, "
1467 "but we don't know if we should pass it. "
1468 "Default to not.\n",
1469 target_pid_to_str (ptid_of (thread
)),
1470 gdb_signal_to_string (signo
));
1476 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1477 target_pid_to_str (ptid_of (thread
)),
1478 gdb_signal_to_string (signo
));
1480 return WSTOPSIG (status
);
1484 /* Detach from LWP. */
1487 linux_detach_one_lwp (struct lwp_info
*lwp
)
1489 struct thread_info
*thread
= get_lwp_thread (lwp
);
1493 /* If there is a pending SIGSTOP, get rid of it. */
1494 if (lwp
->stop_expected
)
1497 debug_printf ("Sending SIGCONT to %s\n",
1498 target_pid_to_str (ptid_of (thread
)));
1500 kill_lwp (lwpid_of (thread
), SIGCONT
);
1501 lwp
->stop_expected
= 0;
1504 /* Pass on any pending signal for this thread. */
1505 sig
= get_detach_signal (thread
);
1507 /* Preparing to resume may try to write registers, and fail if the
1508 lwp is zombie. If that happens, ignore the error. We'll handle
1509 it below, when detach fails with ESRCH. */
1512 /* Flush any pending changes to the process's registers. */
1513 regcache_invalidate_thread (thread
);
1515 /* Finally, let it resume. */
1516 if (the_low_target
.prepare_to_resume
!= NULL
)
1517 the_low_target
.prepare_to_resume (lwp
);
1519 CATCH (ex
, RETURN_MASK_ERROR
)
1521 if (!check_ptrace_stopped_lwp_gone (lwp
))
1522 throw_exception (ex
);
1526 lwpid
= lwpid_of (thread
);
1527 if (ptrace (PTRACE_DETACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0,
1528 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1530 int save_errno
= errno
;
1532 /* We know the thread exists, so ESRCH must mean the lwp is
1533 zombie. This can happen if one of the already-detached
1534 threads exits the whole thread group. In that case we're
1535 still attached, and must reap the lwp. */
1536 if (save_errno
== ESRCH
)
1540 ret
= my_waitpid (lwpid
, &status
, __WALL
);
1543 warning (_("Couldn't reap LWP %d while detaching: %s"),
1544 lwpid
, strerror (errno
));
1546 else if (!WIFEXITED (status
) && !WIFSIGNALED (status
))
1548 warning (_("Reaping LWP %d while detaching "
1549 "returned unexpected status 0x%x"),
1555 error (_("Can't detach %s: %s"),
1556 target_pid_to_str (ptid_of (thread
)),
1557 strerror (save_errno
));
1560 else if (debug_threads
)
1562 debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n",
1563 target_pid_to_str (ptid_of (thread
)),
1570 /* Callback for find_inferior. Detaches from non-leader threads of a
1574 linux_detach_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1576 struct thread_info
*thread
= (struct thread_info
*) entry
;
1577 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1578 int pid
= *(int *) args
;
1579 int lwpid
= lwpid_of (thread
);
1581 /* Skip other processes. */
1582 if (ptid_get_pid (entry
->id
) != pid
)
1585 /* We don't actually detach from the thread group leader just yet.
1586 If the thread group exits, we must reap the zombie clone lwps
1587 before we're able to reap the leader. */
1588 if (ptid_get_pid (entry
->id
) == lwpid
)
1591 linux_detach_one_lwp (lwp
);
1596 linux_detach (int pid
)
1598 struct process_info
*process
;
1599 struct lwp_info
*main_lwp
;
1601 process
= find_process_pid (pid
);
1602 if (process
== NULL
)
1605 /* As there's a step over already in progress, let it finish first,
1606 otherwise nesting a stabilize_threads operation on top gets real
1608 complete_ongoing_step_over ();
1610 /* Stop all threads before detaching. First, ptrace requires that
1611 the thread is stopped to sucessfully detach. Second, thread_db
1612 may need to uninstall thread event breakpoints from memory, which
1613 only works with a stopped process anyway. */
1614 stop_all_lwps (0, NULL
);
1616 #ifdef USE_THREAD_DB
1617 thread_db_detach (process
);
1620 /* Stabilize threads (move out of jump pads). */
1621 stabilize_threads ();
1623 /* Detach from the clone lwps first. If the thread group exits just
1624 while we're detaching, we must reap the clone lwps before we're
1625 able to reap the leader. */
1626 find_inferior (&all_threads
, linux_detach_lwp_callback
, &pid
);
1628 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1629 linux_detach_one_lwp (main_lwp
);
1631 the_target
->mourn (process
);
1633 /* Since we presently can only stop all lwps of all processes, we
1634 need to unstop lwps of other processes. */
1635 unstop_all_lwps (0, NULL
);
1639 /* Remove all LWPs that belong to process PROC from the lwp list. */
1642 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1644 struct thread_info
*thread
= (struct thread_info
*) entry
;
1645 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1646 struct process_info
*process
= (struct process_info
*) proc
;
1648 if (pid_of (thread
) == pid_of (process
))
1655 linux_mourn (struct process_info
*process
)
1657 struct process_info_private
*priv
;
1659 #ifdef USE_THREAD_DB
1660 thread_db_mourn (process
);
1663 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1665 /* Freeing all private data. */
1666 priv
= process
->priv
;
1667 free (priv
->arch_private
);
1669 process
->priv
= NULL
;
1671 remove_process (process
);
1675 linux_join (int pid
)
1680 ret
= my_waitpid (pid
, &status
, 0);
1681 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1683 } while (ret
!= -1 || errno
!= ECHILD
);
1686 /* Return nonzero if the given thread is still alive. */
1688 linux_thread_alive (ptid_t ptid
)
1690 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1692 /* We assume we always know if a thread exits. If a whole process
1693 exited but we still haven't been able to report it to GDB, we'll
1694 hold on to the last lwp of the dead process. */
1696 return !lwp_is_marked_dead (lwp
);
1701 /* Return 1 if this lwp still has an interesting status pending. If
1702 not (e.g., it had stopped for a breakpoint that is gone), return
1706 thread_still_has_status_pending_p (struct thread_info
*thread
)
1708 struct lwp_info
*lp
= get_thread_lwp (thread
);
1710 if (!lp
->status_pending_p
)
1713 if (thread
->last_resume_kind
!= resume_stop
1714 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1715 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1717 struct thread_info
*saved_thread
;
1721 gdb_assert (lp
->last_status
!= 0);
1725 saved_thread
= current_thread
;
1726 current_thread
= thread
;
1728 if (pc
!= lp
->stop_pc
)
1731 debug_printf ("PC of %ld changed\n",
1736 #if !USE_SIGTRAP_SIGINFO
1737 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1738 && !(*the_low_target
.breakpoint_at
) (pc
))
1741 debug_printf ("previous SW breakpoint of %ld gone\n",
1745 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1746 && !hardware_breakpoint_inserted_here (pc
))
1749 debug_printf ("previous HW breakpoint of %ld gone\n",
1755 current_thread
= saved_thread
;
1760 debug_printf ("discarding pending breakpoint status\n");
1761 lp
->status_pending_p
= 0;
1769 /* Returns true if LWP is resumed from the client's perspective. */
1772 lwp_resumed (struct lwp_info
*lwp
)
1774 struct thread_info
*thread
= get_lwp_thread (lwp
);
1776 if (thread
->last_resume_kind
!= resume_stop
)
1779 /* Did gdb send us a `vCont;t', but we haven't reported the
1780 corresponding stop to gdb yet? If so, the thread is still
1781 resumed/running from gdb's perspective. */
1782 if (thread
->last_resume_kind
== resume_stop
1783 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1789 /* Return 1 if this lwp has an interesting status pending. */
1791 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1793 struct thread_info
*thread
= (struct thread_info
*) entry
;
1794 struct lwp_info
*lp
= get_thread_lwp (thread
);
1795 ptid_t ptid
= * (ptid_t
*) arg
;
1797 /* Check if we're only interested in events from a specific process
1798 or a specific LWP. */
1799 if (!ptid_match (ptid_of (thread
), ptid
))
1802 if (!lwp_resumed (lp
))
1805 if (lp
->status_pending_p
1806 && !thread_still_has_status_pending_p (thread
))
1808 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1812 return lp
->status_pending_p
;
1816 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1818 ptid_t ptid
= *(ptid_t
*) data
;
1821 if (ptid_get_lwp (ptid
) != 0)
1822 lwp
= ptid_get_lwp (ptid
);
1824 lwp
= ptid_get_pid (ptid
);
1826 if (ptid_get_lwp (entry
->id
) == lwp
)
1833 find_lwp_pid (ptid_t ptid
)
1835 struct inferior_list_entry
*thread
1836 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1841 return get_thread_lwp ((struct thread_info
*) thread
);
1844 /* Return the number of known LWPs in the tgid given by PID. */
1849 struct inferior_list_entry
*inf
, *tmp
;
1852 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1854 if (ptid_get_pid (inf
->id
) == pid
)
1861 /* The arguments passed to iterate_over_lwps. */
1863 struct iterate_over_lwps_args
1865 /* The FILTER argument passed to iterate_over_lwps. */
1868 /* The CALLBACK argument passed to iterate_over_lwps. */
1869 iterate_over_lwps_ftype
*callback
;
1871 /* The DATA argument passed to iterate_over_lwps. */
1875 /* Callback for find_inferior used by iterate_over_lwps to filter
1876 calls to the callback supplied to that function. Returning a
1877 nonzero value causes find_inferiors to stop iterating and return
1878 the current inferior_list_entry. Returning zero indicates that
1879 find_inferiors should continue iterating. */
1882 iterate_over_lwps_filter (struct inferior_list_entry
*entry
, void *args_p
)
1884 struct iterate_over_lwps_args
*args
1885 = (struct iterate_over_lwps_args
*) args_p
;
1887 if (ptid_match (entry
->id
, args
->filter
))
1889 struct thread_info
*thr
= (struct thread_info
*) entry
;
1890 struct lwp_info
*lwp
= get_thread_lwp (thr
);
1892 return (*args
->callback
) (lwp
, args
->data
);
1898 /* See nat/linux-nat.h. */
1901 iterate_over_lwps (ptid_t filter
,
1902 iterate_over_lwps_ftype callback
,
1905 struct iterate_over_lwps_args args
= {filter
, callback
, data
};
1906 struct inferior_list_entry
*entry
;
1908 entry
= find_inferior (&all_threads
, iterate_over_lwps_filter
, &args
);
1912 return get_thread_lwp ((struct thread_info
*) entry
);
1915 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1916 their exits until all other threads in the group have exited. */
1919 check_zombie_leaders (void)
1921 struct process_info
*proc
, *tmp
;
1923 ALL_PROCESSES (proc
, tmp
)
1925 pid_t leader_pid
= pid_of (proc
);
1926 struct lwp_info
*leader_lp
;
1928 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1931 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1932 "num_lwps=%d, zombie=%d\n",
1933 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1934 linux_proc_pid_is_zombie (leader_pid
));
1936 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1937 /* Check if there are other threads in the group, as we may
1938 have raced with the inferior simply exiting. */
1939 && !last_thread_of_process_p (leader_pid
)
1940 && linux_proc_pid_is_zombie (leader_pid
))
1942 /* A leader zombie can mean one of two things:
1944 - It exited, and there's an exit status pending
1945 available, or only the leader exited (not the whole
1946 program). In the latter case, we can't waitpid the
1947 leader's exit status until all other threads are gone.
1949 - There are 3 or more threads in the group, and a thread
1950 other than the leader exec'd. On an exec, the Linux
1951 kernel destroys all other threads (except the execing
1952 one) in the thread group, and resets the execing thread's
1953 tid to the tgid. No exit notification is sent for the
1954 execing thread -- from the ptracer's perspective, it
1955 appears as though the execing thread just vanishes.
1956 Until we reap all other threads except the leader and the
1957 execing thread, the leader will be zombie, and the
1958 execing thread will be in `D (disc sleep)'. As soon as
1959 all other threads are reaped, the execing thread changes
1960 it's tid to the tgid, and the previous (zombie) leader
1961 vanishes, giving place to the "new" leader. We could try
1962 distinguishing the exit and exec cases, by waiting once
1963 more, and seeing if something comes out, but it doesn't
1964 sound useful. The previous leader _does_ go away, and
1965 we'll re-add the new one once we see the exec event
1966 (which is just the same as what would happen if the
1967 previous leader did exit voluntarily before some other
1972 "CZL: Thread group leader %d zombie "
1973 "(it exited, or another thread execd).\n",
1976 delete_lwp (leader_lp
);
1981 /* Callback for `find_inferior'. Returns the first LWP that is not
1982 stopped. ARG is a PTID filter. */
1985 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
1987 struct thread_info
*thr
= (struct thread_info
*) entry
;
1988 struct lwp_info
*lwp
;
1989 ptid_t filter
= *(ptid_t
*) arg
;
1991 if (!ptid_match (ptid_of (thr
), filter
))
1994 lwp
= get_thread_lwp (thr
);
2001 /* Increment LWP's suspend count. */
2004 lwp_suspended_inc (struct lwp_info
*lwp
)
2008 if (debug_threads
&& lwp
->suspended
> 4)
2010 struct thread_info
*thread
= get_lwp_thread (lwp
);
2012 debug_printf ("LWP %ld has a suspiciously high suspend count,"
2013 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
2017 /* Decrement LWP's suspend count. */
2020 lwp_suspended_decr (struct lwp_info
*lwp
)
2024 if (lwp
->suspended
< 0)
2026 struct thread_info
*thread
= get_lwp_thread (lwp
);
2028 internal_error (__FILE__
, __LINE__
,
2029 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
2034 /* This function should only be called if the LWP got a SIGTRAP.
2036 Handle any tracepoint steps or hits. Return true if a tracepoint
2037 event was handled, 0 otherwise. */
2040 handle_tracepoints (struct lwp_info
*lwp
)
2042 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
2043 int tpoint_related_event
= 0;
2045 gdb_assert (lwp
->suspended
== 0);
2047 /* If this tracepoint hit causes a tracing stop, we'll immediately
2048 uninsert tracepoints. To do this, we temporarily pause all
2049 threads, unpatch away, and then unpause threads. We need to make
2050 sure the unpausing doesn't resume LWP too. */
2051 lwp_suspended_inc (lwp
);
2053 /* And we need to be sure that any all-threads-stopping doesn't try
2054 to move threads out of the jump pads, as it could deadlock the
2055 inferior (LWP could be in the jump pad, maybe even holding the
2058 /* Do any necessary step collect actions. */
2059 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2061 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2063 /* See if we just hit a tracepoint and do its main collect
2065 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2067 lwp_suspended_decr (lwp
);
2069 gdb_assert (lwp
->suspended
== 0);
2070 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
2072 if (tpoint_related_event
)
2075 debug_printf ("got a tracepoint event\n");
2082 /* Convenience wrapper. Returns true if LWP is presently collecting a
2086 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2087 struct fast_tpoint_collect_status
*status
)
2089 CORE_ADDR thread_area
;
2090 struct thread_info
*thread
= get_lwp_thread (lwp
);
2092 if (the_low_target
.get_thread_area
== NULL
)
2095 /* Get the thread area address. This is used to recognize which
2096 thread is which when tracing with the in-process agent library.
2097 We don't read anything from the address, and treat it as opaque;
2098 it's the address itself that we assume is unique per-thread. */
2099 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2102 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2105 /* The reason we resume in the caller, is because we want to be able
2106 to pass lwp->status_pending as WSTAT, and we need to clear
2107 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2108 refuses to resume. */
2111 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2113 struct thread_info
*saved_thread
;
2115 saved_thread
= current_thread
;
2116 current_thread
= get_lwp_thread (lwp
);
2119 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2120 && supports_fast_tracepoints ()
2121 && agent_loaded_p ())
2123 struct fast_tpoint_collect_status status
;
2127 debug_printf ("Checking whether LWP %ld needs to move out of the "
2129 lwpid_of (current_thread
));
2131 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
2134 || (WSTOPSIG (*wstat
) != SIGILL
2135 && WSTOPSIG (*wstat
) != SIGFPE
2136 && WSTOPSIG (*wstat
) != SIGSEGV
2137 && WSTOPSIG (*wstat
) != SIGBUS
))
2139 lwp
->collecting_fast_tracepoint
= r
;
2143 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
2145 /* Haven't executed the original instruction yet.
2146 Set breakpoint there, and wait till it's hit,
2147 then single-step until exiting the jump pad. */
2148 lwp
->exit_jump_pad_bkpt
2149 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2153 debug_printf ("Checking whether LWP %ld needs to move out of "
2154 "the jump pad...it does\n",
2155 lwpid_of (current_thread
));
2156 current_thread
= saved_thread
;
2163 /* If we get a synchronous signal while collecting, *and*
2164 while executing the (relocated) original instruction,
2165 reset the PC to point at the tpoint address, before
2166 reporting to GDB. Otherwise, it's an IPA lib bug: just
2167 report the signal to GDB, and pray for the best. */
2169 lwp
->collecting_fast_tracepoint
= 0;
2172 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2173 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2176 struct regcache
*regcache
;
2178 /* The si_addr on a few signals references the address
2179 of the faulting instruction. Adjust that as
2181 if ((WSTOPSIG (*wstat
) == SIGILL
2182 || WSTOPSIG (*wstat
) == SIGFPE
2183 || WSTOPSIG (*wstat
) == SIGBUS
2184 || WSTOPSIG (*wstat
) == SIGSEGV
)
2185 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2186 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2187 /* Final check just to make sure we don't clobber
2188 the siginfo of non-kernel-sent signals. */
2189 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2191 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2192 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2193 (PTRACE_TYPE_ARG3
) 0, &info
);
2196 regcache
= get_thread_regcache (current_thread
, 1);
2197 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2198 lwp
->stop_pc
= status
.tpoint_addr
;
2200 /* Cancel any fast tracepoint lock this thread was
2202 force_unlock_trace_buffer ();
2205 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2208 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2209 "stopping all threads momentarily.\n");
2211 stop_all_lwps (1, lwp
);
2213 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2214 lwp
->exit_jump_pad_bkpt
= NULL
;
2216 unstop_all_lwps (1, lwp
);
2218 gdb_assert (lwp
->suspended
>= 0);
2224 debug_printf ("Checking whether LWP %ld needs to move out of the "
2226 lwpid_of (current_thread
));
2228 current_thread
= saved_thread
;
2232 /* Enqueue one signal in the "signals to report later when out of the
2236 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2238 struct pending_signals
*p_sig
;
2239 struct thread_info
*thread
= get_lwp_thread (lwp
);
2242 debug_printf ("Deferring signal %d for LWP %ld.\n",
2243 WSTOPSIG (*wstat
), lwpid_of (thread
));
2247 struct pending_signals
*sig
;
2249 for (sig
= lwp
->pending_signals_to_report
;
2252 debug_printf (" Already queued %d\n",
2255 debug_printf (" (no more currently queued signals)\n");
2258 /* Don't enqueue non-RT signals if they are already in the deferred
2259 queue. (SIGSTOP being the easiest signal to see ending up here
2261 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2263 struct pending_signals
*sig
;
2265 for (sig
= lwp
->pending_signals_to_report
;
2269 if (sig
->signal
== WSTOPSIG (*wstat
))
2272 debug_printf ("Not requeuing already queued non-RT signal %d"
2281 p_sig
= XCNEW (struct pending_signals
);
2282 p_sig
->prev
= lwp
->pending_signals_to_report
;
2283 p_sig
->signal
= WSTOPSIG (*wstat
);
2285 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2288 lwp
->pending_signals_to_report
= p_sig
;
2291 /* Dequeue one signal from the "signals to report later when out of
2292 the jump pad" list. */
2295 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2297 struct thread_info
*thread
= get_lwp_thread (lwp
);
2299 if (lwp
->pending_signals_to_report
!= NULL
)
2301 struct pending_signals
**p_sig
;
2303 p_sig
= &lwp
->pending_signals_to_report
;
2304 while ((*p_sig
)->prev
!= NULL
)
2305 p_sig
= &(*p_sig
)->prev
;
2307 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2308 if ((*p_sig
)->info
.si_signo
!= 0)
2309 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2315 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2316 WSTOPSIG (*wstat
), lwpid_of (thread
));
2320 struct pending_signals
*sig
;
2322 for (sig
= lwp
->pending_signals_to_report
;
2325 debug_printf (" Still queued %d\n",
2328 debug_printf (" (no more queued signals)\n");
2337 /* Fetch the possibly triggered data watchpoint info and store it in
2340 On some archs, like x86, that use debug registers to set
2341 watchpoints, it's possible that the way to know which watched
2342 address trapped, is to check the register that is used to select
2343 which address to watch. Problem is, between setting the watchpoint
2344 and reading back which data address trapped, the user may change
2345 the set of watchpoints, and, as a consequence, GDB changes the
2346 debug registers in the inferior. To avoid reading back a stale
2347 stopped-data-address when that happens, we cache in LP the fact
2348 that a watchpoint trapped, and the corresponding data address, as
2349 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2350 registers meanwhile, we have the cached data we can rely on. */
2353 check_stopped_by_watchpoint (struct lwp_info
*child
)
2355 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2357 struct thread_info
*saved_thread
;
2359 saved_thread
= current_thread
;
2360 current_thread
= get_lwp_thread (child
);
2362 if (the_low_target
.stopped_by_watchpoint ())
2364 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2366 if (the_low_target
.stopped_data_address
!= NULL
)
2367 child
->stopped_data_address
2368 = the_low_target
.stopped_data_address ();
2370 child
->stopped_data_address
= 0;
2373 current_thread
= saved_thread
;
2376 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2379 /* Return the ptrace options that we want to try to enable. */
2382 linux_low_ptrace_options (int attached
)
2387 options
|= PTRACE_O_EXITKILL
;
2389 if (report_fork_events
)
2390 options
|= PTRACE_O_TRACEFORK
;
2392 if (report_vfork_events
)
2393 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2395 if (report_exec_events
)
2396 options
|= PTRACE_O_TRACEEXEC
;
2398 options
|= PTRACE_O_TRACESYSGOOD
;
2403 /* Do low-level handling of the event, and check if we should go on
2404 and pass it to caller code. Return the affected lwp if we are, or
2407 static struct lwp_info
*
2408 linux_low_filter_event (int lwpid
, int wstat
)
2410 struct lwp_info
*child
;
2411 struct thread_info
*thread
;
2412 int have_stop_pc
= 0;
2414 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2416 /* Check for stop events reported by a process we didn't already
2417 know about - anything not already in our LWP list.
2419 If we're expecting to receive stopped processes after
2420 fork, vfork, and clone events, then we'll just add the
2421 new one to our list and go back to waiting for the event
2422 to be reported - the stopped process might be returned
2423 from waitpid before or after the event is.
2425 But note the case of a non-leader thread exec'ing after the
2426 leader having exited, and gone from our lists (because
2427 check_zombie_leaders deleted it). The non-leader thread
2428 changes its tid to the tgid. */
2430 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2431 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2435 /* A multi-thread exec after we had seen the leader exiting. */
2438 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2439 "after exec.\n", lwpid
);
2442 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2443 child
= add_lwp (child_ptid
);
2445 current_thread
= child
->thread
;
2448 /* If we didn't find a process, one of two things presumably happened:
2449 - A process we started and then detached from has exited. Ignore it.
2450 - A process we are controlling has forked and the new child's stop
2451 was reported to us by the kernel. Save its PID. */
2452 if (child
== NULL
&& WIFSTOPPED (wstat
))
2454 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2457 else if (child
== NULL
)
2460 thread
= get_lwp_thread (child
);
2464 child
->last_status
= wstat
;
2466 /* Check if the thread has exited. */
2467 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2470 debug_printf ("LLFE: %d exited.\n", lwpid
);
2472 if (finish_step_over (child
))
2474 /* Unsuspend all other LWPs, and set them back running again. */
2475 unsuspend_all_lwps (child
);
2478 /* If there is at least one more LWP, then the exit signal was
2479 not the end of the debugged application and should be
2480 ignored, unless GDB wants to hear about thread exits. */
2481 if (report_thread_events
2482 || last_thread_of_process_p (pid_of (thread
)))
2484 /* Since events are serialized to GDB core, and we can't
2485 report this one right now. Leave the status pending for
2486 the next time we're able to report it. */
2487 mark_lwp_dead (child
, wstat
);
2497 gdb_assert (WIFSTOPPED (wstat
));
2499 if (WIFSTOPPED (wstat
))
2501 struct process_info
*proc
;
2503 /* Architecture-specific setup after inferior is running. */
2504 proc
= find_process_pid (pid_of (thread
));
2505 if (proc
->tdesc
== NULL
)
2509 /* This needs to happen after we have attached to the
2510 inferior and it is stopped for the first time, but
2511 before we access any inferior registers. */
2512 linux_arch_setup_thread (thread
);
2516 /* The process is started, but GDBserver will do
2517 architecture-specific setup after the program stops at
2518 the first instruction. */
2519 child
->status_pending_p
= 1;
2520 child
->status_pending
= wstat
;
2526 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2528 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2529 int options
= linux_low_ptrace_options (proc
->attached
);
2531 linux_enable_event_reporting (lwpid
, options
);
2532 child
->must_set_ptrace_flags
= 0;
2535 /* Always update syscall_state, even if it will be filtered later. */
2536 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2538 child
->syscall_state
2539 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2540 ? TARGET_WAITKIND_SYSCALL_RETURN
2541 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2545 /* Almost all other ptrace-stops are known to be outside of system
2546 calls, with further exceptions in handle_extended_wait. */
2547 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2550 /* Be careful to not overwrite stop_pc until save_stop_reason is
2552 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2553 && linux_is_extended_waitstatus (wstat
))
2555 child
->stop_pc
= get_pc (child
);
2556 if (handle_extended_wait (&child
, wstat
))
2558 /* The event has been handled, so just return without
2564 if (linux_wstatus_maybe_breakpoint (wstat
))
2566 if (save_stop_reason (child
))
2571 child
->stop_pc
= get_pc (child
);
2573 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2574 && child
->stop_expected
)
2577 debug_printf ("Expected stop.\n");
2578 child
->stop_expected
= 0;
2580 if (thread
->last_resume_kind
== resume_stop
)
2582 /* We want to report the stop to the core. Treat the
2583 SIGSTOP as a normal event. */
2585 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2586 target_pid_to_str (ptid_of (thread
)));
2588 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2590 /* Stopping threads. We don't want this SIGSTOP to end up
2593 debug_printf ("LLW: SIGSTOP caught for %s "
2594 "while stopping threads.\n",
2595 target_pid_to_str (ptid_of (thread
)));
2600 /* This is a delayed SIGSTOP. Filter out the event. */
2602 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2603 child
->stepping
? "step" : "continue",
2604 target_pid_to_str (ptid_of (thread
)));
2606 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2611 child
->status_pending_p
= 1;
2612 child
->status_pending
= wstat
;
2616 /* Return true if THREAD is doing hardware single step. */
2619 maybe_hw_step (struct thread_info
*thread
)
2621 if (can_hardware_single_step ())
2625 /* GDBserver must insert reinsert breakpoint for software
2627 gdb_assert (has_reinsert_breakpoints (thread
));
2632 /* Resume LWPs that are currently stopped without any pending status
2633 to report, but are resumed from the core's perspective. */
2636 resume_stopped_resumed_lwps (struct inferior_list_entry
*entry
)
2638 struct thread_info
*thread
= (struct thread_info
*) entry
;
2639 struct lwp_info
*lp
= get_thread_lwp (thread
);
2643 && !lp
->status_pending_p
2644 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2648 if (thread
->last_resume_kind
== resume_step
)
2649 step
= maybe_hw_step (thread
);
2652 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2653 target_pid_to_str (ptid_of (thread
)),
2654 paddress (lp
->stop_pc
),
2657 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2661 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2662 match FILTER_PTID (leaving others pending). The PTIDs can be:
2663 minus_one_ptid, to specify any child; a pid PTID, specifying all
2664 lwps of a thread group; or a PTID representing a single lwp. Store
2665 the stop status through the status pointer WSTAT. OPTIONS is
2666 passed to the waitpid call. Return 0 if no event was found and
2667 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2668 was found. Return the PID of the stopped child otherwise. */
2671 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2672 int *wstatp
, int options
)
2674 struct thread_info
*event_thread
;
2675 struct lwp_info
*event_child
, *requested_child
;
2676 sigset_t block_mask
, prev_mask
;
2679 /* N.B. event_thread points to the thread_info struct that contains
2680 event_child. Keep them in sync. */
2681 event_thread
= NULL
;
2683 requested_child
= NULL
;
2685 /* Check for a lwp with a pending status. */
2687 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2689 event_thread
= (struct thread_info
*)
2690 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2691 if (event_thread
!= NULL
)
2692 event_child
= get_thread_lwp (event_thread
);
2693 if (debug_threads
&& event_thread
)
2694 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2696 else if (!ptid_equal (filter_ptid
, null_ptid
))
2698 requested_child
= find_lwp_pid (filter_ptid
);
2700 if (stopping_threads
== NOT_STOPPING_THREADS
2701 && requested_child
->status_pending_p
2702 && requested_child
->collecting_fast_tracepoint
)
2704 enqueue_one_deferred_signal (requested_child
,
2705 &requested_child
->status_pending
);
2706 requested_child
->status_pending_p
= 0;
2707 requested_child
->status_pending
= 0;
2708 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2711 if (requested_child
->suspended
2712 && requested_child
->status_pending_p
)
2714 internal_error (__FILE__
, __LINE__
,
2715 "requesting an event out of a"
2716 " suspended child?");
2719 if (requested_child
->status_pending_p
)
2721 event_child
= requested_child
;
2722 event_thread
= get_lwp_thread (event_child
);
2726 if (event_child
!= NULL
)
2729 debug_printf ("Got an event from pending child %ld (%04x)\n",
2730 lwpid_of (event_thread
), event_child
->status_pending
);
2731 *wstatp
= event_child
->status_pending
;
2732 event_child
->status_pending_p
= 0;
2733 event_child
->status_pending
= 0;
2734 current_thread
= event_thread
;
2735 return lwpid_of (event_thread
);
2738 /* But if we don't find a pending event, we'll have to wait.
2740 We only enter this loop if no process has a pending wait status.
2741 Thus any action taken in response to a wait status inside this
2742 loop is responding as soon as we detect the status, not after any
2745 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2746 all signals while here. */
2747 sigfillset (&block_mask
);
2748 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2750 /* Always pull all events out of the kernel. We'll randomly select
2751 an event LWP out of all that have events, to prevent
2753 while (event_child
== NULL
)
2757 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2760 - If the thread group leader exits while other threads in the
2761 thread group still exist, waitpid(TGID, ...) hangs. That
2762 waitpid won't return an exit status until the other threads
2763 in the group are reaped.
2765 - When a non-leader thread execs, that thread just vanishes
2766 without reporting an exit (so we'd hang if we waited for it
2767 explicitly in that case). The exec event is reported to
2770 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2773 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2774 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2780 debug_printf ("LLW: waitpid %ld received %s\n",
2781 (long) ret
, status_to_str (*wstatp
));
2784 /* Filter all events. IOW, leave all events pending. We'll
2785 randomly select an event LWP out of all that have events
2787 linux_low_filter_event (ret
, *wstatp
);
2788 /* Retry until nothing comes out of waitpid. A single
2789 SIGCHLD can indicate more than one child stopped. */
2793 /* Now that we've pulled all events out of the kernel, resume
2794 LWPs that don't have an interesting event to report. */
2795 if (stopping_threads
== NOT_STOPPING_THREADS
)
2796 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2798 /* ... and find an LWP with a status to report to the core, if
2800 event_thread
= (struct thread_info
*)
2801 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2802 if (event_thread
!= NULL
)
2804 event_child
= get_thread_lwp (event_thread
);
2805 *wstatp
= event_child
->status_pending
;
2806 event_child
->status_pending_p
= 0;
2807 event_child
->status_pending
= 0;
2811 /* Check for zombie thread group leaders. Those can't be reaped
2812 until all other threads in the thread group are. */
2813 check_zombie_leaders ();
2815 /* If there are no resumed children left in the set of LWPs we
2816 want to wait for, bail. We can't just block in
2817 waitpid/sigsuspend, because lwps might have been left stopped
2818 in trace-stop state, and we'd be stuck forever waiting for
2819 their status to change (which would only happen if we resumed
2820 them). Even if WNOHANG is set, this return code is preferred
2821 over 0 (below), as it is more detailed. */
2822 if ((find_inferior (&all_threads
,
2823 not_stopped_callback
,
2824 &wait_ptid
) == NULL
))
2827 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2828 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2832 /* No interesting event to report to the caller. */
2833 if ((options
& WNOHANG
))
2836 debug_printf ("WNOHANG set, no event found\n");
2838 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2842 /* Block until we get an event reported with SIGCHLD. */
2844 debug_printf ("sigsuspend'ing\n");
2846 sigsuspend (&prev_mask
);
2847 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2851 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2853 current_thread
= event_thread
;
2855 return lwpid_of (event_thread
);
2858 /* Wait for an event from child(ren) PTID. PTIDs can be:
2859 minus_one_ptid, to specify any child; a pid PTID, specifying all
2860 lwps of a thread group; or a PTID representing a single lwp. Store
2861 the stop status through the status pointer WSTAT. OPTIONS is
2862 passed to the waitpid call. Return 0 if no event was found and
2863 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2864 was found. Return the PID of the stopped child otherwise. */
2867 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2869 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2872 /* Count the LWP's that have had events. */
2875 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2877 struct thread_info
*thread
= (struct thread_info
*) entry
;
2878 struct lwp_info
*lp
= get_thread_lwp (thread
);
2879 int *count
= (int *) data
;
2881 gdb_assert (count
!= NULL
);
2883 /* Count only resumed LWPs that have an event pending. */
2884 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2885 && lp
->status_pending_p
)
2891 /* Select the LWP (if any) that is currently being single-stepped. */
2894 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2896 struct thread_info
*thread
= (struct thread_info
*) entry
;
2897 struct lwp_info
*lp
= get_thread_lwp (thread
);
2899 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2900 && thread
->last_resume_kind
== resume_step
2901 && lp
->status_pending_p
)
2907 /* Select the Nth LWP that has had an event. */
2910 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2912 struct thread_info
*thread
= (struct thread_info
*) entry
;
2913 struct lwp_info
*lp
= get_thread_lwp (thread
);
2914 int *selector
= (int *) data
;
2916 gdb_assert (selector
!= NULL
);
2918 /* Select only resumed LWPs that have an event pending. */
2919 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2920 && lp
->status_pending_p
)
2921 if ((*selector
)-- == 0)
2927 /* Select one LWP out of those that have events pending. */
2930 select_event_lwp (struct lwp_info
**orig_lp
)
2933 int random_selector
;
2934 struct thread_info
*event_thread
= NULL
;
2936 /* In all-stop, give preference to the LWP that is being
2937 single-stepped. There will be at most one, and it's the LWP that
2938 the core is most interested in. If we didn't do this, then we'd
2939 have to handle pending step SIGTRAPs somehow in case the core
2940 later continues the previously-stepped thread, otherwise we'd
2941 report the pending SIGTRAP, and the core, not having stepped the
2942 thread, wouldn't understand what the trap was for, and therefore
2943 would report it to the user as a random signal. */
2947 = (struct thread_info
*) find_inferior (&all_threads
,
2948 select_singlestep_lwp_callback
,
2950 if (event_thread
!= NULL
)
2953 debug_printf ("SEL: Select single-step %s\n",
2954 target_pid_to_str (ptid_of (event_thread
)));
2957 if (event_thread
== NULL
)
2959 /* No single-stepping LWP. Select one at random, out of those
2960 which have had events. */
2962 /* First see how many events we have. */
2963 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2964 gdb_assert (num_events
> 0);
2966 /* Now randomly pick a LWP out of those that have had
2968 random_selector
= (int)
2969 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2971 if (debug_threads
&& num_events
> 1)
2972 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2973 num_events
, random_selector
);
2976 = (struct thread_info
*) find_inferior (&all_threads
,
2977 select_event_lwp_callback
,
2981 if (event_thread
!= NULL
)
2983 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2985 /* Switch the event LWP. */
2986 *orig_lp
= event_lp
;
2990 /* Decrement the suspend count of an LWP. */
2993 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2995 struct thread_info
*thread
= (struct thread_info
*) entry
;
2996 struct lwp_info
*lwp
= get_thread_lwp (thread
);
2998 /* Ignore EXCEPT. */
3002 lwp_suspended_decr (lwp
);
3006 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
3010 unsuspend_all_lwps (struct lwp_info
*except
)
3012 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
3015 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
3016 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
3018 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
3019 static ptid_t
linux_wait_1 (ptid_t ptid
,
3020 struct target_waitstatus
*ourstatus
,
3021 int target_options
);
3023 /* Stabilize threads (move out of jump pads).
3025 If a thread is midway collecting a fast tracepoint, we need to
3026 finish the collection and move it out of the jump pad before
3027 reporting the signal.
3029 This avoids recursion while collecting (when a signal arrives
3030 midway, and the signal handler itself collects), which would trash
3031 the trace buffer. In case the user set a breakpoint in a signal
3032 handler, this avoids the backtrace showing the jump pad, etc..
3033 Most importantly, there are certain things we can't do safely if
3034 threads are stopped in a jump pad (or in its callee's). For
3037 - starting a new trace run. A thread still collecting the
3038 previous run, could trash the trace buffer when resumed. The trace
3039 buffer control structures would have been reset but the thread had
3040 no way to tell. The thread could even midway memcpy'ing to the
3041 buffer, which would mean that when resumed, it would clobber the
3042 trace buffer that had been set for a new run.
3044 - we can't rewrite/reuse the jump pads for new tracepoints
3045 safely. Say you do tstart while a thread is stopped midway while
3046 collecting. When the thread is later resumed, it finishes the
3047 collection, and returns to the jump pad, to execute the original
3048 instruction that was under the tracepoint jump at the time the
3049 older run had been started. If the jump pad had been rewritten
3050 since for something else in the new run, the thread would now
3051 execute the wrong / random instructions. */
3054 linux_stabilize_threads (void)
3056 struct thread_info
*saved_thread
;
3057 struct thread_info
*thread_stuck
;
3060 = (struct thread_info
*) find_inferior (&all_threads
,
3061 stuck_in_jump_pad_callback
,
3063 if (thread_stuck
!= NULL
)
3066 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
3067 lwpid_of (thread_stuck
));
3071 saved_thread
= current_thread
;
3073 stabilizing_threads
= 1;
3076 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
3078 /* Loop until all are stopped out of the jump pads. */
3079 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
3081 struct target_waitstatus ourstatus
;
3082 struct lwp_info
*lwp
;
3085 /* Note that we go through the full wait even loop. While
3086 moving threads out of jump pad, we need to be able to step
3087 over internal breakpoints and such. */
3088 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
3090 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
3092 lwp
= get_thread_lwp (current_thread
);
3095 lwp_suspended_inc (lwp
);
3097 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3098 || current_thread
->last_resume_kind
== resume_stop
)
3100 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3101 enqueue_one_deferred_signal (lwp
, &wstat
);
3106 unsuspend_all_lwps (NULL
);
3108 stabilizing_threads
= 0;
3110 current_thread
= saved_thread
;
3115 = (struct thread_info
*) find_inferior (&all_threads
,
3116 stuck_in_jump_pad_callback
,
3118 if (thread_stuck
!= NULL
)
3119 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3120 lwpid_of (thread_stuck
));
3124 /* Convenience function that is called when the kernel reports an
3125 event that is not passed out to GDB. */
3128 ignore_event (struct target_waitstatus
*ourstatus
)
3130 /* If we got an event, there may still be others, as a single
3131 SIGCHLD can indicate more than one child stopped. This forces
3132 another target_wait call. */
3135 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3139 /* Convenience function that is called when the kernel reports an exit
3140 event. This decides whether to report the event to GDB as a
3141 process exit event, a thread exit event, or to suppress the
3145 filter_exit_event (struct lwp_info
*event_child
,
3146 struct target_waitstatus
*ourstatus
)
3148 struct thread_info
*thread
= get_lwp_thread (event_child
);
3149 ptid_t ptid
= ptid_of (thread
);
3151 if (!last_thread_of_process_p (pid_of (thread
)))
3153 if (report_thread_events
)
3154 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3156 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3158 delete_lwp (event_child
);
3163 /* Returns 1 if GDB is interested in any event_child syscalls. */
3166 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3168 struct thread_info
*thread
= get_lwp_thread (event_child
);
3169 struct process_info
*proc
= get_thread_process (thread
);
3171 return !VEC_empty (int, proc
->syscalls_to_catch
);
3174 /* Returns 1 if GDB is interested in the event_child syscall.
3175 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3178 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3182 struct thread_info
*thread
= get_lwp_thread (event_child
);
3183 struct process_info
*proc
= get_thread_process (thread
);
3185 if (VEC_empty (int, proc
->syscalls_to_catch
))
3188 if (VEC_index (int, proc
->syscalls_to_catch
, 0) == ANY_SYSCALL
)
3191 get_syscall_trapinfo (event_child
, &sysno
);
3193 VEC_iterate (int, proc
->syscalls_to_catch
, i
, iter
);
3201 /* Wait for process, returns status. */
3204 linux_wait_1 (ptid_t ptid
,
3205 struct target_waitstatus
*ourstatus
, int target_options
)
3208 struct lwp_info
*event_child
;
3211 int step_over_finished
;
3212 int bp_explains_trap
;
3213 int maybe_internal_trap
;
3222 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3225 /* Translate generic target options into linux options. */
3227 if (target_options
& TARGET_WNOHANG
)
3230 bp_explains_trap
= 0;
3233 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3235 /* Find a resumed LWP, if any. */
3236 if (find_inferior (&all_threads
,
3237 status_pending_p_callback
,
3238 &minus_one_ptid
) != NULL
)
3240 else if ((find_inferior (&all_threads
,
3241 not_stopped_callback
,
3242 &minus_one_ptid
) != NULL
))
3247 if (ptid_equal (step_over_bkpt
, null_ptid
))
3248 pid
= linux_wait_for_event (ptid
, &w
, options
);
3252 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3253 target_pid_to_str (step_over_bkpt
));
3254 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3257 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3259 gdb_assert (target_options
& TARGET_WNOHANG
);
3263 debug_printf ("linux_wait_1 ret = null_ptid, "
3264 "TARGET_WAITKIND_IGNORE\n");
3268 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3275 debug_printf ("linux_wait_1 ret = null_ptid, "
3276 "TARGET_WAITKIND_NO_RESUMED\n");
3280 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3284 event_child
= get_thread_lwp (current_thread
);
3286 /* linux_wait_for_event only returns an exit status for the last
3287 child of a process. Report it. */
3288 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3292 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3293 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3297 debug_printf ("linux_wait_1 ret = %s, exited with "
3299 target_pid_to_str (ptid_of (current_thread
)),
3306 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3307 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3311 debug_printf ("linux_wait_1 ret = %s, terminated with "
3313 target_pid_to_str (ptid_of (current_thread
)),
3319 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3320 return filter_exit_event (event_child
, ourstatus
);
3322 return ptid_of (current_thread
);
3325 /* If step-over executes a breakpoint instruction, in the case of a
3326 hardware single step it means a gdb/gdbserver breakpoint had been
3327 planted on top of a permanent breakpoint, in the case of a software
3328 single step it may just mean that gdbserver hit the reinsert breakpoint.
3329 The PC has been adjusted by save_stop_reason to point at
3330 the breakpoint address.
3331 So in the case of the hardware single step advance the PC manually
3332 past the breakpoint and in the case of software single step advance only
3333 if it's not the reinsert_breakpoint we are hitting.
3334 This avoids that a program would keep trapping a permanent breakpoint
3336 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3337 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3338 && (event_child
->stepping
3339 || !reinsert_breakpoint_inserted_here (event_child
->stop_pc
)))
3341 int increment_pc
= 0;
3342 int breakpoint_kind
= 0;
3343 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3346 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3347 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3351 debug_printf ("step-over for %s executed software breakpoint\n",
3352 target_pid_to_str (ptid_of (current_thread
)));
3355 if (increment_pc
!= 0)
3357 struct regcache
*regcache
3358 = get_thread_regcache (current_thread
, 1);
3360 event_child
->stop_pc
+= increment_pc
;
3361 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3363 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3364 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3368 /* If this event was not handled before, and is not a SIGTRAP, we
3369 report it. SIGILL and SIGSEGV are also treated as traps in case
3370 a breakpoint is inserted at the current PC. If this target does
3371 not support internal breakpoints at all, we also report the
3372 SIGTRAP without further processing; it's of no concern to us. */
3374 = (supports_breakpoints ()
3375 && (WSTOPSIG (w
) == SIGTRAP
3376 || ((WSTOPSIG (w
) == SIGILL
3377 || WSTOPSIG (w
) == SIGSEGV
)
3378 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3380 if (maybe_internal_trap
)
3382 /* Handle anything that requires bookkeeping before deciding to
3383 report the event or continue waiting. */
3385 /* First check if we can explain the SIGTRAP with an internal
3386 breakpoint, or if we should possibly report the event to GDB.
3387 Do this before anything that may remove or insert a
3389 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3391 /* We have a SIGTRAP, possibly a step-over dance has just
3392 finished. If so, tweak the state machine accordingly,
3393 reinsert breakpoints and delete any reinsert (software
3394 single-step) breakpoints. */
3395 step_over_finished
= finish_step_over (event_child
);
3397 /* Now invoke the callbacks of any internal breakpoints there. */
3398 check_breakpoints (event_child
->stop_pc
);
3400 /* Handle tracepoint data collecting. This may overflow the
3401 trace buffer, and cause a tracing stop, removing
3403 trace_event
= handle_tracepoints (event_child
);
3405 if (bp_explains_trap
)
3408 debug_printf ("Hit a gdbserver breakpoint.\n");
3413 /* We have some other signal, possibly a step-over dance was in
3414 progress, and it should be cancelled too. */
3415 step_over_finished
= finish_step_over (event_child
);
3418 /* We have all the data we need. Either report the event to GDB, or
3419 resume threads and keep waiting for more. */
3421 /* If we're collecting a fast tracepoint, finish the collection and
3422 move out of the jump pad before delivering a signal. See
3423 linux_stabilize_threads. */
3426 && WSTOPSIG (w
) != SIGTRAP
3427 && supports_fast_tracepoints ()
3428 && agent_loaded_p ())
3431 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3432 "to defer or adjust it.\n",
3433 WSTOPSIG (w
), lwpid_of (current_thread
));
3435 /* Allow debugging the jump pad itself. */
3436 if (current_thread
->last_resume_kind
!= resume_step
3437 && maybe_move_out_of_jump_pad (event_child
, &w
))
3439 enqueue_one_deferred_signal (event_child
, &w
);
3442 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3443 WSTOPSIG (w
), lwpid_of (current_thread
));
3445 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3447 return ignore_event (ourstatus
);
3451 if (event_child
->collecting_fast_tracepoint
)
3454 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3455 "Check if we're already there.\n",
3456 lwpid_of (current_thread
),
3457 event_child
->collecting_fast_tracepoint
);
3461 event_child
->collecting_fast_tracepoint
3462 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3464 if (event_child
->collecting_fast_tracepoint
!= 1)
3466 /* No longer need this breakpoint. */
3467 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3470 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3471 "stopping all threads momentarily.\n");
3473 /* Other running threads could hit this breakpoint.
3474 We don't handle moribund locations like GDB does,
3475 instead we always pause all threads when removing
3476 breakpoints, so that any step-over or
3477 decr_pc_after_break adjustment is always taken
3478 care of while the breakpoint is still
3480 stop_all_lwps (1, event_child
);
3482 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3483 event_child
->exit_jump_pad_bkpt
= NULL
;
3485 unstop_all_lwps (1, event_child
);
3487 gdb_assert (event_child
->suspended
>= 0);
3491 if (event_child
->collecting_fast_tracepoint
== 0)
3494 debug_printf ("fast tracepoint finished "
3495 "collecting successfully.\n");
3497 /* We may have a deferred signal to report. */
3498 if (dequeue_one_deferred_signal (event_child
, &w
))
3501 debug_printf ("dequeued one signal.\n");
3506 debug_printf ("no deferred signals.\n");
3508 if (stabilizing_threads
)
3510 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3511 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3515 debug_printf ("linux_wait_1 ret = %s, stopped "
3516 "while stabilizing threads\n",
3517 target_pid_to_str (ptid_of (current_thread
)));
3521 return ptid_of (current_thread
);
3527 /* Check whether GDB would be interested in this event. */
3529 /* Check if GDB is interested in this syscall. */
3531 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3532 && !gdb_catch_this_syscall_p (event_child
))
3536 debug_printf ("Ignored syscall for LWP %ld.\n",
3537 lwpid_of (current_thread
));
3540 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3542 return ignore_event (ourstatus
);
3545 /* If GDB is not interested in this signal, don't stop other
3546 threads, and don't report it to GDB. Just resume the inferior
3547 right away. We do this for threading-related signals as well as
3548 any that GDB specifically requested we ignore. But never ignore
3549 SIGSTOP if we sent it ourselves, and do not ignore signals when
3550 stepping - they may require special handling to skip the signal
3551 handler. Also never ignore signals that could be caused by a
3554 && current_thread
->last_resume_kind
!= resume_step
3556 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3557 (current_process ()->priv
->thread_db
!= NULL
3558 && (WSTOPSIG (w
) == __SIGRTMIN
3559 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3562 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3563 && !(WSTOPSIG (w
) == SIGSTOP
3564 && current_thread
->last_resume_kind
== resume_stop
)
3565 && !linux_wstatus_maybe_breakpoint (w
))))
3567 siginfo_t info
, *info_p
;
3570 debug_printf ("Ignored signal %d for LWP %ld.\n",
3571 WSTOPSIG (w
), lwpid_of (current_thread
));
3573 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3574 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3579 if (step_over_finished
)
3581 /* We cancelled this thread's step-over above. We still
3582 need to unsuspend all other LWPs, and set them back
3583 running again while the signal handler runs. */
3584 unsuspend_all_lwps (event_child
);
3586 /* Enqueue the pending signal info so that proceed_all_lwps
3588 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3590 proceed_all_lwps ();
3594 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3595 WSTOPSIG (w
), info_p
);
3597 return ignore_event (ourstatus
);
3600 /* Note that all addresses are always "out of the step range" when
3601 there's no range to begin with. */
3602 in_step_range
= lwp_in_step_range (event_child
);
3604 /* If GDB wanted this thread to single step, and the thread is out
3605 of the step range, we always want to report the SIGTRAP, and let
3606 GDB handle it. Watchpoints should always be reported. So should
3607 signals we can't explain. A SIGTRAP we can't explain could be a
3608 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3609 do, we're be able to handle GDB breakpoints on top of internal
3610 breakpoints, by handling the internal breakpoint and still
3611 reporting the event to GDB. If we don't, we're out of luck, GDB
3612 won't see the breakpoint hit. If we see a single-step event but
3613 the thread should be continuing, don't pass the trap to gdb.
3614 That indicates that we had previously finished a single-step but
3615 left the single-step pending -- see
3616 complete_ongoing_step_over. */
3617 report_to_gdb
= (!maybe_internal_trap
3618 || (current_thread
->last_resume_kind
== resume_step
3620 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3622 && !bp_explains_trap
3624 && !step_over_finished
3625 && !(current_thread
->last_resume_kind
== resume_continue
3626 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3627 || (gdb_breakpoint_here (event_child
->stop_pc
)
3628 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3629 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3630 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3632 run_breakpoint_commands (event_child
->stop_pc
);
3634 /* We found no reason GDB would want us to stop. We either hit one
3635 of our own breakpoints, or finished an internal step GDB
3636 shouldn't know about. */
3641 if (bp_explains_trap
)
3642 debug_printf ("Hit a gdbserver breakpoint.\n");
3643 if (step_over_finished
)
3644 debug_printf ("Step-over finished.\n");
3646 debug_printf ("Tracepoint event.\n");
3647 if (lwp_in_step_range (event_child
))
3648 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3649 paddress (event_child
->stop_pc
),
3650 paddress (event_child
->step_range_start
),
3651 paddress (event_child
->step_range_end
));
3654 /* We're not reporting this breakpoint to GDB, so apply the
3655 decr_pc_after_break adjustment to the inferior's regcache
3658 if (the_low_target
.set_pc
!= NULL
)
3660 struct regcache
*regcache
3661 = get_thread_regcache (current_thread
, 1);
3662 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3665 /* We may have finished stepping over a breakpoint. If so,
3666 we've stopped and suspended all LWPs momentarily except the
3667 stepping one. This is where we resume them all again. We're
3668 going to keep waiting, so use proceed, which handles stepping
3669 over the next breakpoint. */
3671 debug_printf ("proceeding all threads.\n");
3673 if (step_over_finished
)
3674 unsuspend_all_lwps (event_child
);
3676 proceed_all_lwps ();
3677 return ignore_event (ourstatus
);
3682 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3686 str
= target_waitstatus_to_string (&event_child
->waitstatus
);
3687 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3688 lwpid_of (get_lwp_thread (event_child
)), str
);
3691 if (current_thread
->last_resume_kind
== resume_step
)
3693 if (event_child
->step_range_start
== event_child
->step_range_end
)
3694 debug_printf ("GDB wanted to single-step, reporting event.\n");
3695 else if (!lwp_in_step_range (event_child
))
3696 debug_printf ("Out of step range, reporting event.\n");
3698 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3699 debug_printf ("Stopped by watchpoint.\n");
3700 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3701 debug_printf ("Stopped by GDB breakpoint.\n");
3703 debug_printf ("Hit a non-gdbserver trap event.\n");
3706 /* Alright, we're going to report a stop. */
3708 /* Remove reinsert breakpoints. */
3709 if (can_software_single_step ())
3711 /* Remove reinsert breakpoints or not. It it is true, stop all
3712 lwps, so that other threads won't hit the breakpoint in the
3714 int remove_reinsert_breakpoints_p
= 0;
3718 remove_reinsert_breakpoints_p
3719 = has_reinsert_breakpoints (current_thread
);
3723 /* In all-stop, a stop reply cancels all previous resume
3724 requests. Delete all reinsert breakpoints. */
3725 struct inferior_list_entry
*inf
, *tmp
;
3727 ALL_INFERIORS (&all_threads
, inf
, tmp
)
3729 struct thread_info
*thread
= (struct thread_info
*) inf
;
3731 if (has_reinsert_breakpoints (thread
))
3733 remove_reinsert_breakpoints_p
= 1;
3739 if (remove_reinsert_breakpoints_p
)
3741 /* If we remove reinsert breakpoints from memory, stop all lwps,
3742 so that other threads won't hit the breakpoint in the staled
3744 stop_all_lwps (0, event_child
);
3748 gdb_assert (has_reinsert_breakpoints (current_thread
));
3749 delete_reinsert_breakpoints (current_thread
);
3753 struct inferior_list_entry
*inf
, *tmp
;
3755 ALL_INFERIORS (&all_threads
, inf
, tmp
)
3757 struct thread_info
*thread
= (struct thread_info
*) inf
;
3759 if (has_reinsert_breakpoints (thread
))
3760 delete_reinsert_breakpoints (thread
);
3764 unstop_all_lwps (0, event_child
);
3768 if (!stabilizing_threads
)
3770 /* In all-stop, stop all threads. */
3772 stop_all_lwps (0, NULL
);
3774 if (step_over_finished
)
3778 /* If we were doing a step-over, all other threads but
3779 the stepping one had been paused in start_step_over,
3780 with their suspend counts incremented. We don't want
3781 to do a full unstop/unpause, because we're in
3782 all-stop mode (so we want threads stopped), but we
3783 still need to unsuspend the other threads, to
3784 decrement their `suspended' count back. */
3785 unsuspend_all_lwps (event_child
);
3789 /* If we just finished a step-over, then all threads had
3790 been momentarily paused. In all-stop, that's fine,
3791 we want threads stopped by now anyway. In non-stop,
3792 we need to re-resume threads that GDB wanted to be
3794 unstop_all_lwps (1, event_child
);
3798 /* If we're not waiting for a specific LWP, choose an event LWP
3799 from among those that have had events. Giving equal priority
3800 to all LWPs that have had events helps prevent
3802 if (ptid_equal (ptid
, minus_one_ptid
))
3804 event_child
->status_pending_p
= 1;
3805 event_child
->status_pending
= w
;
3807 select_event_lwp (&event_child
);
3809 /* current_thread and event_child must stay in sync. */
3810 current_thread
= get_lwp_thread (event_child
);
3812 event_child
->status_pending_p
= 0;
3813 w
= event_child
->status_pending
;
3817 /* Stabilize threads (move out of jump pads). */
3819 stabilize_threads ();
3823 /* If we just finished a step-over, then all threads had been
3824 momentarily paused. In all-stop, that's fine, we want
3825 threads stopped by now anyway. In non-stop, we need to
3826 re-resume threads that GDB wanted to be running. */
3827 if (step_over_finished
)
3828 unstop_all_lwps (1, event_child
);
3831 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3833 /* If the reported event is an exit, fork, vfork or exec, let
3835 *ourstatus
= event_child
->waitstatus
;
3836 /* Clear the event lwp's waitstatus since we handled it already. */
3837 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3840 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3842 /* Now that we've selected our final event LWP, un-adjust its PC if
3843 it was a software breakpoint, and the client doesn't know we can
3844 adjust the breakpoint ourselves. */
3845 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3846 && !swbreak_feature
)
3848 int decr_pc
= the_low_target
.decr_pc_after_break
;
3852 struct regcache
*regcache
3853 = get_thread_regcache (current_thread
, 1);
3854 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3858 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3860 get_syscall_trapinfo (event_child
,
3861 &ourstatus
->value
.syscall_number
);
3862 ourstatus
->kind
= event_child
->syscall_state
;
3864 else if (current_thread
->last_resume_kind
== resume_stop
3865 && WSTOPSIG (w
) == SIGSTOP
)
3867 /* A thread that has been requested to stop by GDB with vCont;t,
3868 and it stopped cleanly, so report as SIG0. The use of
3869 SIGSTOP is an implementation detail. */
3870 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3872 else if (current_thread
->last_resume_kind
== resume_stop
3873 && WSTOPSIG (w
) != SIGSTOP
)
3875 /* A thread that has been requested to stop by GDB with vCont;t,
3876 but, it stopped for other reasons. */
3877 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3879 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3881 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3884 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3888 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3889 target_pid_to_str (ptid_of (current_thread
)),
3890 ourstatus
->kind
, ourstatus
->value
.sig
);
3894 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3895 return filter_exit_event (event_child
, ourstatus
);
3897 return ptid_of (current_thread
);
3900 /* Get rid of any pending event in the pipe. */
3902 async_file_flush (void)
3908 ret
= read (linux_event_pipe
[0], &buf
, 1);
3909 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3912 /* Put something in the pipe, so the event loop wakes up. */
3914 async_file_mark (void)
3918 async_file_flush ();
3921 ret
= write (linux_event_pipe
[1], "+", 1);
3922 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3924 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3925 be awakened anyway. */
3929 linux_wait (ptid_t ptid
,
3930 struct target_waitstatus
*ourstatus
, int target_options
)
3934 /* Flush the async file first. */
3935 if (target_is_async_p ())
3936 async_file_flush ();
3940 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3942 while ((target_options
& TARGET_WNOHANG
) == 0
3943 && ptid_equal (event_ptid
, null_ptid
)
3944 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3946 /* If at least one stop was reported, there may be more. A single
3947 SIGCHLD can signal more than one child stop. */
3948 if (target_is_async_p ()
3949 && (target_options
& TARGET_WNOHANG
) != 0
3950 && !ptid_equal (event_ptid
, null_ptid
))
3956 /* Send a signal to an LWP. */
3959 kill_lwp (unsigned long lwpid
, int signo
)
3964 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3965 if (errno
== ENOSYS
)
3967 /* If tkill fails, then we are not using nptl threads, a
3968 configuration we no longer support. */
3969 perror_with_name (("tkill"));
3975 linux_stop_lwp (struct lwp_info
*lwp
)
3981 send_sigstop (struct lwp_info
*lwp
)
3985 pid
= lwpid_of (get_lwp_thread (lwp
));
3987 /* If we already have a pending stop signal for this process, don't
3989 if (lwp
->stop_expected
)
3992 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3998 debug_printf ("Sending sigstop to lwp %d\n", pid
);
4000 lwp
->stop_expected
= 1;
4001 kill_lwp (pid
, SIGSTOP
);
4005 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
4007 struct thread_info
*thread
= (struct thread_info
*) entry
;
4008 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4010 /* Ignore EXCEPT. */
4021 /* Increment the suspend count of an LWP, and stop it, if not stopped
4024 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
4027 struct thread_info
*thread
= (struct thread_info
*) entry
;
4028 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4030 /* Ignore EXCEPT. */
4034 lwp_suspended_inc (lwp
);
4036 return send_sigstop_callback (entry
, except
);
4040 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
4042 /* Store the exit status for later. */
4043 lwp
->status_pending_p
= 1;
4044 lwp
->status_pending
= wstat
;
4046 /* Store in waitstatus as well, as there's nothing else to process
4048 if (WIFEXITED (wstat
))
4050 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
4051 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
4053 else if (WIFSIGNALED (wstat
))
4055 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
4056 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
4059 /* Prevent trying to stop it. */
4062 /* No further stops are expected from a dead lwp. */
4063 lwp
->stop_expected
= 0;
4066 /* Return true if LWP has exited already, and has a pending exit event
4067 to report to GDB. */
4070 lwp_is_marked_dead (struct lwp_info
*lwp
)
4072 return (lwp
->status_pending_p
4073 && (WIFEXITED (lwp
->status_pending
)
4074 || WIFSIGNALED (lwp
->status_pending
)));
4077 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4080 wait_for_sigstop (void)
4082 struct thread_info
*saved_thread
;
4087 saved_thread
= current_thread
;
4088 if (saved_thread
!= NULL
)
4089 saved_tid
= saved_thread
->entry
.id
;
4091 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4094 debug_printf ("wait_for_sigstop: pulling events\n");
4096 /* Passing NULL_PTID as filter indicates we want all events to be
4097 left pending. Eventually this returns when there are no
4098 unwaited-for children left. */
4099 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4101 gdb_assert (ret
== -1);
4103 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4104 current_thread
= saved_thread
;
4108 debug_printf ("Previously current thread died.\n");
4110 /* We can't change the current inferior behind GDB's back,
4111 otherwise, a subsequent command may apply to the wrong
4113 current_thread
= NULL
;
4117 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
4118 move it out, because we need to report the stop event to GDB. For
4119 example, if the user puts a breakpoint in the jump pad, it's
4120 because she wants to debug it. */
4123 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
4125 struct thread_info
*thread
= (struct thread_info
*) entry
;
4126 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4128 if (lwp
->suspended
!= 0)
4130 internal_error (__FILE__
, __LINE__
,
4131 "LWP %ld is suspended, suspended=%d\n",
4132 lwpid_of (thread
), lwp
->suspended
);
4134 gdb_assert (lwp
->stopped
);
4136 /* Allow debugging the jump pad, gdb_collect, etc.. */
4137 return (supports_fast_tracepoints ()
4138 && agent_loaded_p ()
4139 && (gdb_breakpoint_here (lwp
->stop_pc
)
4140 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4141 || thread
->last_resume_kind
== resume_step
)
4142 && linux_fast_tracepoint_collecting (lwp
, NULL
));
4146 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
4148 struct thread_info
*thread
= (struct thread_info
*) entry
;
4149 struct thread_info
*saved_thread
;
4150 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4153 if (lwp
->suspended
!= 0)
4155 internal_error (__FILE__
, __LINE__
,
4156 "LWP %ld is suspended, suspended=%d\n",
4157 lwpid_of (thread
), lwp
->suspended
);
4159 gdb_assert (lwp
->stopped
);
4161 /* For gdb_breakpoint_here. */
4162 saved_thread
= current_thread
;
4163 current_thread
= thread
;
4165 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4167 /* Allow debugging the jump pad, gdb_collect, etc. */
4168 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4169 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4170 && thread
->last_resume_kind
!= resume_step
4171 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4174 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4179 lwp
->status_pending_p
= 0;
4180 enqueue_one_deferred_signal (lwp
, wstat
);
4183 debug_printf ("Signal %d for LWP %ld deferred "
4185 WSTOPSIG (*wstat
), lwpid_of (thread
));
4188 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4191 lwp_suspended_inc (lwp
);
4193 current_thread
= saved_thread
;
4197 lwp_running (struct inferior_list_entry
*entry
, void *data
)
4199 struct thread_info
*thread
= (struct thread_info
*) entry
;
4200 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4202 if (lwp_is_marked_dead (lwp
))
4209 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4210 If SUSPEND, then also increase the suspend count of every LWP,
4214 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4216 /* Should not be called recursively. */
4217 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4222 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4223 suspend
? "stop-and-suspend" : "stop",
4225 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4229 stopping_threads
= (suspend
4230 ? STOPPING_AND_SUSPENDING_THREADS
4231 : STOPPING_THREADS
);
4234 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
4236 find_inferior (&all_threads
, send_sigstop_callback
, except
);
4237 wait_for_sigstop ();
4238 stopping_threads
= NOT_STOPPING_THREADS
;
4242 debug_printf ("stop_all_lwps done, setting stopping_threads "
4243 "back to !stopping\n");
4248 /* Enqueue one signal in the chain of signals which need to be
4249 delivered to this process on next resume. */
4252 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4254 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4256 p_sig
->prev
= lwp
->pending_signals
;
4257 p_sig
->signal
= signal
;
4259 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4261 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4262 lwp
->pending_signals
= p_sig
;
4265 /* Install breakpoints for software single stepping. */
4268 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4272 struct thread_info
*thread
= get_lwp_thread (lwp
);
4273 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4274 VEC (CORE_ADDR
) *next_pcs
= NULL
;
4275 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
4277 make_cleanup (VEC_cleanup (CORE_ADDR
), &next_pcs
);
4279 current_thread
= thread
;
4280 next_pcs
= (*the_low_target
.get_next_pcs
) (regcache
);
4282 for (i
= 0; VEC_iterate (CORE_ADDR
, next_pcs
, i
, pc
); ++i
)
4283 set_reinsert_breakpoint (pc
, current_ptid
);
4285 do_cleanups (old_chain
);
4288 /* Single step via hardware or software single step.
4289 Return 1 if hardware single stepping, 0 if software single stepping
4290 or can't single step. */
4293 single_step (struct lwp_info
* lwp
)
4297 if (can_hardware_single_step ())
4301 else if (can_software_single_step ())
4303 install_software_single_step_breakpoints (lwp
);
4309 debug_printf ("stepping is not implemented on this target");
4315 /* The signal can be delivered to the inferior if we are not trying to
4316 finish a fast tracepoint collect. Since signal can be delivered in
4317 the step-over, the program may go to signal handler and trap again
4318 after return from the signal handler. We can live with the spurious
4322 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4324 return !lwp
->collecting_fast_tracepoint
;
4327 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4328 SIGNAL is nonzero, give it that signal. */
4331 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4332 int step
, int signal
, siginfo_t
*info
)
4334 struct thread_info
*thread
= get_lwp_thread (lwp
);
4335 struct thread_info
*saved_thread
;
4336 int fast_tp_collecting
;
4338 struct process_info
*proc
= get_thread_process (thread
);
4340 /* Note that target description may not be initialised
4341 (proc->tdesc == NULL) at this point because the program hasn't
4342 stopped at the first instruction yet. It means GDBserver skips
4343 the extra traps from the wrapper program (see option --wrapper).
4344 Code in this function that requires register access should be
4345 guarded by proc->tdesc == NULL or something else. */
4347 if (lwp
->stopped
== 0)
4350 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4352 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
4354 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
4356 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4357 user used the "jump" command, or "set $pc = foo"). */
4358 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4360 /* Collecting 'while-stepping' actions doesn't make sense
4362 release_while_stepping_state_list (thread
);
4365 /* If we have pending signals or status, and a new signal, enqueue the
4366 signal. Also enqueue the signal if it can't be delivered to the
4367 inferior right now. */
4369 && (lwp
->status_pending_p
4370 || lwp
->pending_signals
!= NULL
4371 || !lwp_signal_can_be_delivered (lwp
)))
4373 enqueue_pending_signal (lwp
, signal
, info
);
4375 /* Postpone any pending signal. It was enqueued above. */
4379 if (lwp
->status_pending_p
)
4382 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4383 " has pending status\n",
4384 lwpid_of (thread
), step
? "step" : "continue",
4385 lwp
->stop_expected
? "expected" : "not expected");
4389 saved_thread
= current_thread
;
4390 current_thread
= thread
;
4392 /* This bit needs some thinking about. If we get a signal that
4393 we must report while a single-step reinsert is still pending,
4394 we often end up resuming the thread. It might be better to
4395 (ew) allow a stack of pending events; then we could be sure that
4396 the reinsert happened right away and not lose any signals.
4398 Making this stack would also shrink the window in which breakpoints are
4399 uninserted (see comment in linux_wait_for_lwp) but not enough for
4400 complete correctness, so it won't solve that problem. It may be
4401 worthwhile just to solve this one, however. */
4402 if (lwp
->bp_reinsert
!= 0)
4405 debug_printf (" pending reinsert at 0x%s\n",
4406 paddress (lwp
->bp_reinsert
));
4408 if (can_hardware_single_step ())
4410 if (fast_tp_collecting
== 0)
4413 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
4415 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
4420 step
= maybe_hw_step (thread
);
4423 if (fast_tp_collecting
== 1)
4426 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4427 " (exit-jump-pad-bkpt)\n",
4430 else if (fast_tp_collecting
== 2)
4433 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4434 " single-stepping\n",
4437 if (can_hardware_single_step ())
4441 internal_error (__FILE__
, __LINE__
,
4442 "moving out of jump pad single-stepping"
4443 " not implemented on this target");
4447 /* If we have while-stepping actions in this thread set it stepping.
4448 If we have a signal to deliver, it may or may not be set to
4449 SIG_IGN, we don't know. Assume so, and allow collecting
4450 while-stepping into a signal handler. A possible smart thing to
4451 do would be to set an internal breakpoint at the signal return
4452 address, continue, and carry on catching this while-stepping
4453 action only when that breakpoint is hit. A future
4455 if (thread
->while_stepping
!= NULL
)
4458 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4461 step
= single_step (lwp
);
4464 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4466 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4468 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4472 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4473 (long) lwp
->stop_pc
);
4477 /* If we have pending signals, consume one if it can be delivered to
4479 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4481 struct pending_signals
**p_sig
;
4483 p_sig
= &lwp
->pending_signals
;
4484 while ((*p_sig
)->prev
!= NULL
)
4485 p_sig
= &(*p_sig
)->prev
;
4487 signal
= (*p_sig
)->signal
;
4488 if ((*p_sig
)->info
.si_signo
!= 0)
4489 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4497 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4498 lwpid_of (thread
), step
? "step" : "continue", signal
,
4499 lwp
->stop_expected
? "expected" : "not expected");
4501 if (the_low_target
.prepare_to_resume
!= NULL
)
4502 the_low_target
.prepare_to_resume (lwp
);
4504 regcache_invalidate_thread (thread
);
4506 lwp
->stepping
= step
;
4508 ptrace_request
= PTRACE_SINGLESTEP
;
4509 else if (gdb_catching_syscalls_p (lwp
))
4510 ptrace_request
= PTRACE_SYSCALL
;
4512 ptrace_request
= PTRACE_CONT
;
4513 ptrace (ptrace_request
,
4515 (PTRACE_TYPE_ARG3
) 0,
4516 /* Coerce to a uintptr_t first to avoid potential gcc warning
4517 of coercing an 8 byte integer to a 4 byte pointer. */
4518 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4520 current_thread
= saved_thread
;
4522 perror_with_name ("resuming thread");
4524 /* Successfully resumed. Clear state that no longer makes sense,
4525 and mark the LWP as running. Must not do this before resuming
4526 otherwise if that fails other code will be confused. E.g., we'd
4527 later try to stop the LWP and hang forever waiting for a stop
4528 status. Note that we must not throw after this is cleared,
4529 otherwise handle_zombie_lwp_error would get confused. */
4531 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4534 /* Called when we try to resume a stopped LWP and that errors out. If
4535 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4536 or about to become), discard the error, clear any pending status
4537 the LWP may have, and return true (we'll collect the exit status
4538 soon enough). Otherwise, return false. */
4541 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4543 struct thread_info
*thread
= get_lwp_thread (lp
);
4545 /* If we get an error after resuming the LWP successfully, we'd
4546 confuse !T state for the LWP being gone. */
4547 gdb_assert (lp
->stopped
);
4549 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4550 because even if ptrace failed with ESRCH, the tracee may be "not
4551 yet fully dead", but already refusing ptrace requests. In that
4552 case the tracee has 'R (Running)' state for a little bit
4553 (observed in Linux 3.18). See also the note on ESRCH in the
4554 ptrace(2) man page. Instead, check whether the LWP has any state
4555 other than ptrace-stopped. */
4557 /* Don't assume anything if /proc/PID/status can't be read. */
4558 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4560 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4561 lp
->status_pending_p
= 0;
4567 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4568 disappears while we try to resume it. */
4571 linux_resume_one_lwp (struct lwp_info
*lwp
,
4572 int step
, int signal
, siginfo_t
*info
)
4576 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4578 CATCH (ex
, RETURN_MASK_ERROR
)
4580 if (!check_ptrace_stopped_lwp_gone (lwp
))
4581 throw_exception (ex
);
4586 struct thread_resume_array
4588 struct thread_resume
*resume
;
4592 /* This function is called once per thread via find_inferior.
4593 ARG is a pointer to a thread_resume_array struct.
4594 We look up the thread specified by ENTRY in ARG, and mark the thread
4595 with a pointer to the appropriate resume request.
4597 This algorithm is O(threads * resume elements), but resume elements
4598 is small (and will remain small at least until GDB supports thread
4602 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
4604 struct thread_info
*thread
= (struct thread_info
*) entry
;
4605 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4607 struct thread_resume_array
*r
;
4609 r
= (struct thread_resume_array
*) arg
;
4611 for (ndx
= 0; ndx
< r
->n
; ndx
++)
4613 ptid_t ptid
= r
->resume
[ndx
].thread
;
4614 if (ptid_equal (ptid
, minus_one_ptid
)
4615 || ptid_equal (ptid
, entry
->id
)
4616 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4618 || (ptid_get_pid (ptid
) == pid_of (thread
)
4619 && (ptid_is_pid (ptid
)
4620 || ptid_get_lwp (ptid
) == -1)))
4622 if (r
->resume
[ndx
].kind
== resume_stop
4623 && thread
->last_resume_kind
== resume_stop
)
4626 debug_printf ("already %s LWP %ld at GDB's request\n",
4627 (thread
->last_status
.kind
4628 == TARGET_WAITKIND_STOPPED
)
4636 lwp
->resume
= &r
->resume
[ndx
];
4637 thread
->last_resume_kind
= lwp
->resume
->kind
;
4639 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4640 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4642 /* If we had a deferred signal to report, dequeue one now.
4643 This can happen if LWP gets more than one signal while
4644 trying to get out of a jump pad. */
4646 && !lwp
->status_pending_p
4647 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4649 lwp
->status_pending_p
= 1;
4652 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4653 "leaving status pending.\n",
4654 WSTOPSIG (lwp
->status_pending
),
4662 /* No resume action for this thread. */
4668 /* find_inferior callback for linux_resume.
4669 Set *FLAG_P if this lwp has an interesting status pending. */
4672 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
4674 struct thread_info
*thread
= (struct thread_info
*) entry
;
4675 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4677 /* LWPs which will not be resumed are not interesting, because
4678 we might not wait for them next time through linux_wait. */
4679 if (lwp
->resume
== NULL
)
4682 if (thread_still_has_status_pending_p (thread
))
4683 * (int *) flag_p
= 1;
4688 /* Return 1 if this lwp that GDB wants running is stopped at an
4689 internal breakpoint that we need to step over. It assumes that any
4690 required STOP_PC adjustment has already been propagated to the
4691 inferior's regcache. */
4694 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
4696 struct thread_info
*thread
= (struct thread_info
*) entry
;
4697 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4698 struct thread_info
*saved_thread
;
4700 struct process_info
*proc
= get_thread_process (thread
);
4702 /* GDBserver is skipping the extra traps from the wrapper program,
4703 don't have to do step over. */
4704 if (proc
->tdesc
== NULL
)
4707 /* LWPs which will not be resumed are not interesting, because we
4708 might not wait for them next time through linux_wait. */
4713 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4718 if (thread
->last_resume_kind
== resume_stop
)
4721 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4727 gdb_assert (lwp
->suspended
>= 0);
4732 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4737 if (lwp
->status_pending_p
)
4740 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4746 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4750 /* If the PC has changed since we stopped, then don't do anything,
4751 and let the breakpoint/tracepoint be hit. This happens if, for
4752 instance, GDB handled the decr_pc_after_break subtraction itself,
4753 GDB is OOL stepping this thread, or the user has issued a "jump"
4754 command, or poked thread's registers herself. */
4755 if (pc
!= lwp
->stop_pc
)
4758 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4759 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4761 paddress (lwp
->stop_pc
), paddress (pc
));
4765 /* On software single step target, resume the inferior with signal
4766 rather than stepping over. */
4767 if (can_software_single_step ()
4768 && lwp
->pending_signals
!= NULL
4769 && lwp_signal_can_be_delivered (lwp
))
4772 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4779 saved_thread
= current_thread
;
4780 current_thread
= thread
;
4782 /* We can only step over breakpoints we know about. */
4783 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4785 /* Don't step over a breakpoint that GDB expects to hit
4786 though. If the condition is being evaluated on the target's side
4787 and it evaluate to false, step over this breakpoint as well. */
4788 if (gdb_breakpoint_here (pc
)
4789 && gdb_condition_true_at_breakpoint (pc
)
4790 && gdb_no_commands_at_breakpoint (pc
))
4793 debug_printf ("Need step over [LWP %ld]? yes, but found"
4794 " GDB breakpoint at 0x%s; skipping step over\n",
4795 lwpid_of (thread
), paddress (pc
));
4797 current_thread
= saved_thread
;
4803 debug_printf ("Need step over [LWP %ld]? yes, "
4804 "found breakpoint at 0x%s\n",
4805 lwpid_of (thread
), paddress (pc
));
4807 /* We've found an lwp that needs stepping over --- return 1 so
4808 that find_inferior stops looking. */
4809 current_thread
= saved_thread
;
4815 current_thread
= saved_thread
;
4818 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4820 lwpid_of (thread
), paddress (pc
));
4825 /* Start a step-over operation on LWP. When LWP stopped at a
4826 breakpoint, to make progress, we need to remove the breakpoint out
4827 of the way. If we let other threads run while we do that, they may
4828 pass by the breakpoint location and miss hitting it. To avoid
4829 that, a step-over momentarily stops all threads while LWP is
4830 single-stepped by either hardware or software while the breakpoint
4831 is temporarily uninserted from the inferior. When the single-step
4832 finishes, we reinsert the breakpoint, and let all threads that are
4833 supposed to be running, run again. */
4836 start_step_over (struct lwp_info
*lwp
)
4838 struct thread_info
*thread
= get_lwp_thread (lwp
);
4839 struct thread_info
*saved_thread
;
4844 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4847 stop_all_lwps (1, lwp
);
4849 if (lwp
->suspended
!= 0)
4851 internal_error (__FILE__
, __LINE__
,
4852 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4857 debug_printf ("Done stopping all threads for step-over.\n");
4859 /* Note, we should always reach here with an already adjusted PC,
4860 either by GDB (if we're resuming due to GDB's request), or by our
4861 caller, if we just finished handling an internal breakpoint GDB
4862 shouldn't care about. */
4865 saved_thread
= current_thread
;
4866 current_thread
= thread
;
4868 lwp
->bp_reinsert
= pc
;
4869 uninsert_breakpoints_at (pc
);
4870 uninsert_fast_tracepoint_jumps_at (pc
);
4872 step
= single_step (lwp
);
4874 current_thread
= saved_thread
;
4876 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4878 /* Require next event from this LWP. */
4879 step_over_bkpt
= thread
->entry
.id
;
4883 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4884 start_step_over, if still there, and delete any reinsert
4885 breakpoints we've set, on non hardware single-step targets. */
4888 finish_step_over (struct lwp_info
*lwp
)
4890 if (lwp
->bp_reinsert
!= 0)
4892 struct thread_info
*saved_thread
= current_thread
;
4895 debug_printf ("Finished step over.\n");
4897 current_thread
= get_lwp_thread (lwp
);
4899 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4900 may be no breakpoint to reinsert there by now. */
4901 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4902 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4904 lwp
->bp_reinsert
= 0;
4906 /* Delete any software-single-step reinsert breakpoints. No
4907 longer needed. We don't have to worry about other threads
4908 hitting this trap, and later not being able to explain it,
4909 because we were stepping over a breakpoint, and we hold all
4910 threads but LWP stopped while doing that. */
4911 if (!can_hardware_single_step ())
4913 gdb_assert (has_reinsert_breakpoints (current_thread
));
4914 delete_reinsert_breakpoints (current_thread
);
4917 step_over_bkpt
= null_ptid
;
4918 current_thread
= saved_thread
;
4925 /* If there's a step over in progress, wait until all threads stop
4926 (that is, until the stepping thread finishes its step), and
4927 unsuspend all lwps. The stepping thread ends with its status
4928 pending, which is processed later when we get back to processing
4932 complete_ongoing_step_over (void)
4934 if (!ptid_equal (step_over_bkpt
, null_ptid
))
4936 struct lwp_info
*lwp
;
4941 debug_printf ("detach: step over in progress, finish it first\n");
4943 /* Passing NULL_PTID as filter indicates we want all events to
4944 be left pending. Eventually this returns when there are no
4945 unwaited-for children left. */
4946 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4948 gdb_assert (ret
== -1);
4950 lwp
= find_lwp_pid (step_over_bkpt
);
4952 finish_step_over (lwp
);
4953 step_over_bkpt
= null_ptid
;
4954 unsuspend_all_lwps (lwp
);
4958 /* This function is called once per thread. We check the thread's resume
4959 request, which will tell us whether to resume, step, or leave the thread
4960 stopped; and what signal, if any, it should be sent.
4962 For threads which we aren't explicitly told otherwise, we preserve
4963 the stepping flag; this is used for stepping over gdbserver-placed
4966 If pending_flags was set in any thread, we queue any needed
4967 signals, since we won't actually resume. We already have a pending
4968 event to report, so we don't need to preserve any step requests;
4969 they should be re-issued if necessary. */
4972 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
4974 struct thread_info
*thread
= (struct thread_info
*) entry
;
4975 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4976 int leave_all_stopped
= * (int *) arg
;
4979 if (lwp
->resume
== NULL
)
4982 if (lwp
->resume
->kind
== resume_stop
)
4985 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4990 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
4992 /* Stop the thread, and wait for the event asynchronously,
4993 through the event loop. */
4999 debug_printf ("already stopped LWP %ld\n",
5002 /* The LWP may have been stopped in an internal event that
5003 was not meant to be notified back to GDB (e.g., gdbserver
5004 breakpoint), so we should be reporting a stop event in
5007 /* If the thread already has a pending SIGSTOP, this is a
5008 no-op. Otherwise, something later will presumably resume
5009 the thread and this will cause it to cancel any pending
5010 operation, due to last_resume_kind == resume_stop. If
5011 the thread already has a pending status to report, we
5012 will still report it the next time we wait - see
5013 status_pending_p_callback. */
5015 /* If we already have a pending signal to report, then
5016 there's no need to queue a SIGSTOP, as this means we're
5017 midway through moving the LWP out of the jumppad, and we
5018 will report the pending signal as soon as that is
5020 if (lwp
->pending_signals_to_report
== NULL
)
5024 /* For stop requests, we're done. */
5026 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5030 /* If this thread which is about to be resumed has a pending status,
5031 then don't resume it - we can just report the pending status.
5032 Likewise if it is suspended, because e.g., another thread is
5033 stepping past a breakpoint. Make sure to queue any signals that
5034 would otherwise be sent. In all-stop mode, we do this decision
5035 based on if *any* thread has a pending status. If there's a
5036 thread that needs the step-over-breakpoint dance, then don't
5037 resume any other thread but that particular one. */
5038 leave_pending
= (lwp
->suspended
5039 || lwp
->status_pending_p
5040 || leave_all_stopped
);
5042 /* If we have a new signal, enqueue the signal. */
5043 if (lwp
->resume
->sig
!= 0)
5045 siginfo_t info
, *info_p
;
5047 /* If this is the same signal we were previously stopped by,
5048 make sure to queue its siginfo. */
5049 if (WIFSTOPPED (lwp
->last_status
)
5050 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
5051 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
5052 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
5057 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
5063 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
5065 proceed_one_lwp (entry
, NULL
);
5070 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5073 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5079 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5081 struct thread_resume_array array
= { resume_info
, n
};
5082 struct thread_info
*need_step_over
= NULL
;
5084 int leave_all_stopped
;
5089 debug_printf ("linux_resume:\n");
5092 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
5094 /* If there is a thread which would otherwise be resumed, which has
5095 a pending status, then don't resume any threads - we can just
5096 report the pending status. Make sure to queue any signals that
5097 would otherwise be sent. In non-stop mode, we'll apply this
5098 logic to each thread individually. We consume all pending events
5099 before considering to start a step-over (in all-stop). */
5102 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
5104 /* If there is a thread which would otherwise be resumed, which is
5105 stopped at a breakpoint that needs stepping over, then don't
5106 resume any threads - have it step over the breakpoint with all
5107 other threads stopped, then resume all threads again. Make sure
5108 to queue any signals that would otherwise be delivered or
5110 if (!any_pending
&& supports_breakpoints ())
5112 = (struct thread_info
*) find_inferior (&all_threads
,
5113 need_step_over_p
, NULL
);
5115 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5119 if (need_step_over
!= NULL
)
5120 debug_printf ("Not resuming all, need step over\n");
5121 else if (any_pending
)
5122 debug_printf ("Not resuming, all-stop and found "
5123 "an LWP with pending status\n");
5125 debug_printf ("Resuming, no pending status or step over needed\n");
5128 /* Even if we're leaving threads stopped, queue all signals we'd
5129 otherwise deliver. */
5130 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
5133 start_step_over (get_thread_lwp (need_step_over
));
5137 debug_printf ("linux_resume done\n");
5141 /* We may have events that were pending that can/should be sent to
5142 the client now. Trigger a linux_wait call. */
5143 if (target_is_async_p ())
5147 /* This function is called once per thread. We check the thread's
5148 last resume request, which will tell us whether to resume, step, or
5149 leave the thread stopped. Any signal the client requested to be
5150 delivered has already been enqueued at this point.
5152 If any thread that GDB wants running is stopped at an internal
5153 breakpoint that needs stepping over, we start a step-over operation
5154 on that particular thread, and leave all others stopped. */
5157 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
5159 struct thread_info
*thread
= (struct thread_info
*) entry
;
5160 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5167 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5172 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5176 if (thread
->last_resume_kind
== resume_stop
5177 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5180 debug_printf (" client wants LWP to remain %ld stopped\n",
5185 if (lwp
->status_pending_p
)
5188 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5193 gdb_assert (lwp
->suspended
>= 0);
5198 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5202 if (thread
->last_resume_kind
== resume_stop
5203 && lwp
->pending_signals_to_report
== NULL
5204 && lwp
->collecting_fast_tracepoint
== 0)
5206 /* We haven't reported this LWP as stopped yet (otherwise, the
5207 last_status.kind check above would catch it, and we wouldn't
5208 reach here. This LWP may have been momentarily paused by a
5209 stop_all_lwps call while handling for example, another LWP's
5210 step-over. In that case, the pending expected SIGSTOP signal
5211 that was queued at vCont;t handling time will have already
5212 been consumed by wait_for_sigstop, and so we need to requeue
5213 another one here. Note that if the LWP already has a SIGSTOP
5214 pending, this is a no-op. */
5217 debug_printf ("Client wants LWP %ld to stop. "
5218 "Making sure it has a SIGSTOP pending\n",
5224 if (thread
->last_resume_kind
== resume_step
)
5227 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5230 /* If resume_step is requested by GDB, install reinsert
5231 breakpoints when the thread is about to be actually resumed if
5232 the reinsert breakpoints weren't removed. */
5233 if (can_software_single_step () && !has_reinsert_breakpoints (thread
))
5234 install_software_single_step_breakpoints (lwp
);
5236 step
= maybe_hw_step (thread
);
5238 else if (lwp
->bp_reinsert
!= 0)
5241 debug_printf (" stepping LWP %ld, reinsert set\n",
5244 step
= maybe_hw_step (thread
);
5249 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5254 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
5256 struct thread_info
*thread
= (struct thread_info
*) entry
;
5257 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5262 lwp_suspended_decr (lwp
);
5264 return proceed_one_lwp (entry
, except
);
5267 /* When we finish a step-over, set threads running again. If there's
5268 another thread that may need a step-over, now's the time to start
5269 it. Eventually, we'll move all threads past their breakpoints. */
5272 proceed_all_lwps (void)
5274 struct thread_info
*need_step_over
;
5276 /* If there is a thread which would otherwise be resumed, which is
5277 stopped at a breakpoint that needs stepping over, then don't
5278 resume any threads - have it step over the breakpoint with all
5279 other threads stopped, then resume all threads again. */
5281 if (supports_breakpoints ())
5284 = (struct thread_info
*) find_inferior (&all_threads
,
5285 need_step_over_p
, NULL
);
5287 if (need_step_over
!= NULL
)
5290 debug_printf ("proceed_all_lwps: found "
5291 "thread %ld needing a step-over\n",
5292 lwpid_of (need_step_over
));
5294 start_step_over (get_thread_lwp (need_step_over
));
5300 debug_printf ("Proceeding, no step-over needed\n");
5302 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
5305 /* Stopped LWPs that the client wanted to be running, that don't have
5306 pending statuses, are set to run again, except for EXCEPT, if not
5307 NULL. This undoes a stop_all_lwps call. */
5310 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5316 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5317 lwpid_of (get_lwp_thread (except
)));
5319 debug_printf ("unstopping all lwps\n");
5323 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
5325 find_inferior (&all_threads
, proceed_one_lwp
, except
);
5329 debug_printf ("unstop_all_lwps done\n");
5335 #ifdef HAVE_LINUX_REGSETS
5337 #define use_linux_regsets 1
5339 /* Returns true if REGSET has been disabled. */
5342 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5344 return (info
->disabled_regsets
!= NULL
5345 && info
->disabled_regsets
[regset
- info
->regsets
]);
5348 /* Disable REGSET. */
5351 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5355 dr_offset
= regset
- info
->regsets
;
5356 if (info
->disabled_regsets
== NULL
)
5357 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5358 info
->disabled_regsets
[dr_offset
] = 1;
5362 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5363 struct regcache
*regcache
)
5365 struct regset_info
*regset
;
5366 int saw_general_regs
= 0;
5370 pid
= lwpid_of (current_thread
);
5371 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5376 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5379 buf
= xmalloc (regset
->size
);
5381 nt_type
= regset
->nt_type
;
5385 iov
.iov_len
= regset
->size
;
5386 data
= (void *) &iov
;
5392 res
= ptrace (regset
->get_request
, pid
,
5393 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5395 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5401 /* If we get EIO on a regset, do not try it again for
5402 this process mode. */
5403 disable_regset (regsets_info
, regset
);
5405 else if (errno
== ENODATA
)
5407 /* ENODATA may be returned if the regset is currently
5408 not "active". This can happen in normal operation,
5409 so suppress the warning in this case. */
5411 else if (errno
== ESRCH
)
5413 /* At this point, ESRCH should mean the process is
5414 already gone, in which case we simply ignore attempts
5415 to read its registers. */
5420 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5427 if (regset
->type
== GENERAL_REGS
)
5428 saw_general_regs
= 1;
5429 regset
->store_function (regcache
, buf
);
5433 if (saw_general_regs
)
5440 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5441 struct regcache
*regcache
)
5443 struct regset_info
*regset
;
5444 int saw_general_regs
= 0;
5448 pid
= lwpid_of (current_thread
);
5449 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5454 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5455 || regset
->fill_function
== NULL
)
5458 buf
= xmalloc (regset
->size
);
5460 /* First fill the buffer with the current register set contents,
5461 in case there are any items in the kernel's regset that are
5462 not in gdbserver's regcache. */
5464 nt_type
= regset
->nt_type
;
5468 iov
.iov_len
= regset
->size
;
5469 data
= (void *) &iov
;
5475 res
= ptrace (regset
->get_request
, pid
,
5476 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5478 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5483 /* Then overlay our cached registers on that. */
5484 regset
->fill_function (regcache
, buf
);
5486 /* Only now do we write the register set. */
5488 res
= ptrace (regset
->set_request
, pid
,
5489 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5491 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5499 /* If we get EIO on a regset, do not try it again for
5500 this process mode. */
5501 disable_regset (regsets_info
, regset
);
5503 else if (errno
== ESRCH
)
5505 /* At this point, ESRCH should mean the process is
5506 already gone, in which case we simply ignore attempts
5507 to change its registers. See also the related
5508 comment in linux_resume_one_lwp. */
5514 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5517 else if (regset
->type
== GENERAL_REGS
)
5518 saw_general_regs
= 1;
5521 if (saw_general_regs
)
5527 #else /* !HAVE_LINUX_REGSETS */
5529 #define use_linux_regsets 0
5530 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5531 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5535 /* Return 1 if register REGNO is supported by one of the regset ptrace
5536 calls or 0 if it has to be transferred individually. */
5539 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5541 unsigned char mask
= 1 << (regno
% 8);
5542 size_t index
= regno
/ 8;
5544 return (use_linux_regsets
5545 && (regs_info
->regset_bitmap
== NULL
5546 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5549 #ifdef HAVE_LINUX_USRREGS
5552 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5556 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5557 error ("Invalid register number %d.", regnum
);
5559 addr
= usrregs
->regmap
[regnum
];
5564 /* Fetch one register. */
5566 fetch_register (const struct usrregs_info
*usrregs
,
5567 struct regcache
*regcache
, int regno
)
5574 if (regno
>= usrregs
->num_regs
)
5576 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5579 regaddr
= register_addr (usrregs
, regno
);
5583 size
= ((register_size (regcache
->tdesc
, regno
)
5584 + sizeof (PTRACE_XFER_TYPE
) - 1)
5585 & -sizeof (PTRACE_XFER_TYPE
));
5586 buf
= (char *) alloca (size
);
5588 pid
= lwpid_of (current_thread
);
5589 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5592 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5593 ptrace (PTRACE_PEEKUSER
, pid
,
5594 /* Coerce to a uintptr_t first to avoid potential gcc warning
5595 of coercing an 8 byte integer to a 4 byte pointer. */
5596 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5597 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5599 error ("reading register %d: %s", regno
, strerror (errno
));
5602 if (the_low_target
.supply_ptrace_register
)
5603 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5605 supply_register (regcache
, regno
, buf
);
5608 /* Store one register. */
5610 store_register (const struct usrregs_info
*usrregs
,
5611 struct regcache
*regcache
, int regno
)
5618 if (regno
>= usrregs
->num_regs
)
5620 if ((*the_low_target
.cannot_store_register
) (regno
))
5623 regaddr
= register_addr (usrregs
, regno
);
5627 size
= ((register_size (regcache
->tdesc
, regno
)
5628 + sizeof (PTRACE_XFER_TYPE
) - 1)
5629 & -sizeof (PTRACE_XFER_TYPE
));
5630 buf
= (char *) alloca (size
);
5631 memset (buf
, 0, size
);
5633 if (the_low_target
.collect_ptrace_register
)
5634 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5636 collect_register (regcache
, regno
, buf
);
5638 pid
= lwpid_of (current_thread
);
5639 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5642 ptrace (PTRACE_POKEUSER
, pid
,
5643 /* Coerce to a uintptr_t first to avoid potential gcc warning
5644 about coercing an 8 byte integer to a 4 byte pointer. */
5645 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5646 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5649 /* At this point, ESRCH should mean the process is
5650 already gone, in which case we simply ignore attempts
5651 to change its registers. See also the related
5652 comment in linux_resume_one_lwp. */
5656 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5657 error ("writing register %d: %s", regno
, strerror (errno
));
5659 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5663 /* Fetch all registers, or just one, from the child process.
5664 If REGNO is -1, do this for all registers, skipping any that are
5665 assumed to have been retrieved by regsets_fetch_inferior_registers,
5666 unless ALL is non-zero.
5667 Otherwise, REGNO specifies which register (so we can save time). */
5669 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5670 struct regcache
*regcache
, int regno
, int all
)
5672 struct usrregs_info
*usr
= regs_info
->usrregs
;
5676 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5677 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5678 fetch_register (usr
, regcache
, regno
);
5681 fetch_register (usr
, regcache
, regno
);
5684 /* Store our register values back into the inferior.
5685 If REGNO is -1, do this for all registers, skipping any that are
5686 assumed to have been saved by regsets_store_inferior_registers,
5687 unless ALL is non-zero.
5688 Otherwise, REGNO specifies which register (so we can save time). */
5690 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5691 struct regcache
*regcache
, int regno
, int all
)
5693 struct usrregs_info
*usr
= regs_info
->usrregs
;
5697 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5698 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5699 store_register (usr
, regcache
, regno
);
5702 store_register (usr
, regcache
, regno
);
5705 #else /* !HAVE_LINUX_USRREGS */
5707 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5708 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5714 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5718 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5722 if (the_low_target
.fetch_register
!= NULL
5723 && regs_info
->usrregs
!= NULL
)
5724 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5725 (*the_low_target
.fetch_register
) (regcache
, regno
);
5727 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5728 if (regs_info
->usrregs
!= NULL
)
5729 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5733 if (the_low_target
.fetch_register
!= NULL
5734 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5737 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5739 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5741 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5742 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5747 linux_store_registers (struct regcache
*regcache
, int regno
)
5751 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5755 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5757 if (regs_info
->usrregs
!= NULL
)
5758 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5762 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5764 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5766 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5767 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5772 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5773 to debugger memory starting at MYADDR. */
5776 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5778 int pid
= lwpid_of (current_thread
);
5779 register PTRACE_XFER_TYPE
*buffer
;
5780 register CORE_ADDR addr
;
5787 /* Try using /proc. Don't bother for one word. */
5788 if (len
>= 3 * sizeof (long))
5792 /* We could keep this file open and cache it - possibly one per
5793 thread. That requires some juggling, but is even faster. */
5794 sprintf (filename
, "/proc/%d/mem", pid
);
5795 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5799 /* If pread64 is available, use it. It's faster if the kernel
5800 supports it (only one syscall), and it's 64-bit safe even on
5801 32-bit platforms (for instance, SPARC debugging a SPARC64
5804 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5807 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5808 bytes
= read (fd
, myaddr
, len
);
5815 /* Some data was read, we'll try to get the rest with ptrace. */
5825 /* Round starting address down to longword boundary. */
5826 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5827 /* Round ending address up; get number of longwords that makes. */
5828 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5829 / sizeof (PTRACE_XFER_TYPE
));
5830 /* Allocate buffer of that many longwords. */
5831 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5833 /* Read all the longwords */
5835 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5837 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5838 about coercing an 8 byte integer to a 4 byte pointer. */
5839 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5840 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5841 (PTRACE_TYPE_ARG4
) 0);
5847 /* Copy appropriate bytes out of the buffer. */
5850 i
*= sizeof (PTRACE_XFER_TYPE
);
5851 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5853 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5860 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5861 memory at MEMADDR. On failure (cannot write to the inferior)
5862 returns the value of errno. Always succeeds if LEN is zero. */
5865 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5868 /* Round starting address down to longword boundary. */
5869 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5870 /* Round ending address up; get number of longwords that makes. */
5872 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5873 / sizeof (PTRACE_XFER_TYPE
);
5875 /* Allocate buffer of that many longwords. */
5876 register PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5878 int pid
= lwpid_of (current_thread
);
5882 /* Zero length write always succeeds. */
5888 /* Dump up to four bytes. */
5889 char str
[4 * 2 + 1];
5891 int dump
= len
< 4 ? len
: 4;
5893 for (i
= 0; i
< dump
; i
++)
5895 sprintf (p
, "%02x", myaddr
[i
]);
5900 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5901 str
, (long) memaddr
, pid
);
5904 /* Fill start and end extra bytes of buffer with existing memory data. */
5907 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5908 about coercing an 8 byte integer to a 4 byte pointer. */
5909 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5910 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5911 (PTRACE_TYPE_ARG4
) 0);
5919 = ptrace (PTRACE_PEEKTEXT
, pid
,
5920 /* Coerce to a uintptr_t first to avoid potential gcc warning
5921 about coercing an 8 byte integer to a 4 byte pointer. */
5922 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5923 * sizeof (PTRACE_XFER_TYPE
)),
5924 (PTRACE_TYPE_ARG4
) 0);
5929 /* Copy data to be written over corresponding part of buffer. */
5931 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5934 /* Write the entire buffer. */
5936 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5939 ptrace (PTRACE_POKETEXT
, pid
,
5940 /* Coerce to a uintptr_t first to avoid potential gcc warning
5941 about coercing an 8 byte integer to a 4 byte pointer. */
5942 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5943 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5952 linux_look_up_symbols (void)
5954 #ifdef USE_THREAD_DB
5955 struct process_info
*proc
= current_process ();
5957 if (proc
->priv
->thread_db
!= NULL
)
5965 linux_request_interrupt (void)
5967 extern unsigned long signal_pid
;
5969 /* Send a SIGINT to the process group. This acts just like the user
5970 typed a ^C on the controlling terminal. */
5971 kill (-signal_pid
, SIGINT
);
5974 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5975 to debugger memory starting at MYADDR. */
5978 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5980 char filename
[PATH_MAX
];
5982 int pid
= lwpid_of (current_thread
);
5984 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5986 fd
= open (filename
, O_RDONLY
);
5990 if (offset
!= (CORE_ADDR
) 0
5991 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5994 n
= read (fd
, myaddr
, len
);
6001 /* These breakpoint and watchpoint related wrapper functions simply
6002 pass on the function call if the target has registered a
6003 corresponding function. */
6006 linux_supports_z_point_type (char z_type
)
6008 return (the_low_target
.supports_z_point_type
!= NULL
6009 && the_low_target
.supports_z_point_type (z_type
));
6013 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6014 int size
, struct raw_breakpoint
*bp
)
6016 if (type
== raw_bkpt_type_sw
)
6017 return insert_memory_breakpoint (bp
);
6018 else if (the_low_target
.insert_point
!= NULL
)
6019 return the_low_target
.insert_point (type
, addr
, size
, bp
);
6021 /* Unsupported (see target.h). */
6026 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6027 int size
, struct raw_breakpoint
*bp
)
6029 if (type
== raw_bkpt_type_sw
)
6030 return remove_memory_breakpoint (bp
);
6031 else if (the_low_target
.remove_point
!= NULL
)
6032 return the_low_target
.remove_point (type
, addr
, size
, bp
);
6034 /* Unsupported (see target.h). */
6038 /* Implement the to_stopped_by_sw_breakpoint target_ops
6042 linux_stopped_by_sw_breakpoint (void)
6044 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6046 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
6049 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
6053 linux_supports_stopped_by_sw_breakpoint (void)
6055 return USE_SIGTRAP_SIGINFO
;
6058 /* Implement the to_stopped_by_hw_breakpoint target_ops
6062 linux_stopped_by_hw_breakpoint (void)
6064 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6066 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6069 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6073 linux_supports_stopped_by_hw_breakpoint (void)
6075 return USE_SIGTRAP_SIGINFO
;
6078 /* Implement the supports_hardware_single_step target_ops method. */
6081 linux_supports_hardware_single_step (void)
6083 return can_hardware_single_step ();
6087 linux_supports_software_single_step (void)
6089 return can_software_single_step ();
6093 linux_stopped_by_watchpoint (void)
6095 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6097 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6101 linux_stopped_data_address (void)
6103 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6105 return lwp
->stopped_data_address
;
6108 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6109 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6110 && defined(PT_TEXT_END_ADDR)
6112 /* This is only used for targets that define PT_TEXT_ADDR,
6113 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6114 the target has different ways of acquiring this information, like
6117 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6118 to tell gdb about. */
6121 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6123 unsigned long text
, text_end
, data
;
6124 int pid
= lwpid_of (current_thread
);
6128 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6129 (PTRACE_TYPE_ARG4
) 0);
6130 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6131 (PTRACE_TYPE_ARG4
) 0);
6132 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6133 (PTRACE_TYPE_ARG4
) 0);
6137 /* Both text and data offsets produced at compile-time (and so
6138 used by gdb) are relative to the beginning of the program,
6139 with the data segment immediately following the text segment.
6140 However, the actual runtime layout in memory may put the data
6141 somewhere else, so when we send gdb a data base-address, we
6142 use the real data base address and subtract the compile-time
6143 data base-address from it (which is just the length of the
6144 text segment). BSS immediately follows data in both
6147 *data_p
= data
- (text_end
- text
);
6156 linux_qxfer_osdata (const char *annex
,
6157 unsigned char *readbuf
, unsigned const char *writebuf
,
6158 CORE_ADDR offset
, int len
)
6160 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6163 /* Convert a native/host siginfo object, into/from the siginfo in the
6164 layout of the inferiors' architecture. */
6167 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6171 if (the_low_target
.siginfo_fixup
!= NULL
)
6172 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6174 /* If there was no callback, or the callback didn't do anything,
6175 then just do a straight memcpy. */
6179 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6181 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6186 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6187 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6191 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6193 if (current_thread
== NULL
)
6196 pid
= lwpid_of (current_thread
);
6199 debug_printf ("%s siginfo for lwp %d.\n",
6200 readbuf
!= NULL
? "Reading" : "Writing",
6203 if (offset
>= sizeof (siginfo
))
6206 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6209 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6210 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6211 inferior with a 64-bit GDBSERVER should look the same as debugging it
6212 with a 32-bit GDBSERVER, we need to convert it. */
6213 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6215 if (offset
+ len
> sizeof (siginfo
))
6216 len
= sizeof (siginfo
) - offset
;
6218 if (readbuf
!= NULL
)
6219 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6222 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6224 /* Convert back to ptrace layout before flushing it out. */
6225 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6227 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6234 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6235 so we notice when children change state; as the handler for the
6236 sigsuspend in my_waitpid. */
6239 sigchld_handler (int signo
)
6241 int old_errno
= errno
;
6247 /* fprintf is not async-signal-safe, so call write
6249 if (write (2, "sigchld_handler\n",
6250 sizeof ("sigchld_handler\n") - 1) < 0)
6251 break; /* just ignore */
6255 if (target_is_async_p ())
6256 async_file_mark (); /* trigger a linux_wait */
6262 linux_supports_non_stop (void)
6268 linux_async (int enable
)
6270 int previous
= target_is_async_p ();
6273 debug_printf ("linux_async (%d), previous=%d\n",
6276 if (previous
!= enable
)
6279 sigemptyset (&mask
);
6280 sigaddset (&mask
, SIGCHLD
);
6282 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6286 if (pipe (linux_event_pipe
) == -1)
6288 linux_event_pipe
[0] = -1;
6289 linux_event_pipe
[1] = -1;
6290 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6292 warning ("creating event pipe failed.");
6296 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6297 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6299 /* Register the event loop handler. */
6300 add_file_handler (linux_event_pipe
[0],
6301 handle_target_event
, NULL
);
6303 /* Always trigger a linux_wait. */
6308 delete_file_handler (linux_event_pipe
[0]);
6310 close (linux_event_pipe
[0]);
6311 close (linux_event_pipe
[1]);
6312 linux_event_pipe
[0] = -1;
6313 linux_event_pipe
[1] = -1;
6316 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6323 linux_start_non_stop (int nonstop
)
6325 /* Register or unregister from event-loop accordingly. */
6326 linux_async (nonstop
);
6328 if (target_is_async_p () != (nonstop
!= 0))
6335 linux_supports_multi_process (void)
6340 /* Check if fork events are supported. */
6343 linux_supports_fork_events (void)
6345 return linux_supports_tracefork ();
6348 /* Check if vfork events are supported. */
6351 linux_supports_vfork_events (void)
6353 return linux_supports_tracefork ();
6356 /* Check if exec events are supported. */
6359 linux_supports_exec_events (void)
6361 return linux_supports_traceexec ();
6364 /* Callback for 'find_inferior'. Set the (possibly changed) ptrace
6365 options for the specified lwp. */
6368 reset_lwp_ptrace_options_callback (struct inferior_list_entry
*entry
,
6371 struct thread_info
*thread
= (struct thread_info
*) entry
;
6372 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6376 /* Stop the lwp so we can modify its ptrace options. */
6377 lwp
->must_set_ptrace_flags
= 1;
6378 linux_stop_lwp (lwp
);
6382 /* Already stopped; go ahead and set the ptrace options. */
6383 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6384 int options
= linux_low_ptrace_options (proc
->attached
);
6386 linux_enable_event_reporting (lwpid_of (thread
), options
);
6387 lwp
->must_set_ptrace_flags
= 0;
6393 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6394 ptrace flags for all inferiors. This is in case the new GDB connection
6395 doesn't support the same set of events that the previous one did. */
6398 linux_handle_new_gdb_connection (void)
6402 /* Request that all the lwps reset their ptrace options. */
6403 find_inferior (&all_threads
, reset_lwp_ptrace_options_callback
, &pid
);
6407 linux_supports_disable_randomization (void)
6409 #ifdef HAVE_PERSONALITY
6417 linux_supports_agent (void)
6423 linux_supports_range_stepping (void)
6425 if (*the_low_target
.supports_range_stepping
== NULL
)
6428 return (*the_low_target
.supports_range_stepping
) ();
6431 /* Enumerate spufs IDs for process PID. */
6433 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6439 struct dirent
*entry
;
6441 sprintf (path
, "/proc/%ld/fd", pid
);
6442 dir
= opendir (path
);
6447 while ((entry
= readdir (dir
)) != NULL
)
6453 fd
= atoi (entry
->d_name
);
6457 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6458 if (stat (path
, &st
) != 0)
6460 if (!S_ISDIR (st
.st_mode
))
6463 if (statfs (path
, &stfs
) != 0)
6465 if (stfs
.f_type
!= SPUFS_MAGIC
)
6468 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6470 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6480 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6481 object type, using the /proc file system. */
6483 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6484 unsigned const char *writebuf
,
6485 CORE_ADDR offset
, int len
)
6487 long pid
= lwpid_of (current_thread
);
6492 if (!writebuf
&& !readbuf
)
6500 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6503 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6504 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6509 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6516 ret
= write (fd
, writebuf
, (size_t) len
);
6518 ret
= read (fd
, readbuf
, (size_t) len
);
6524 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6525 struct target_loadseg
6527 /* Core address to which the segment is mapped. */
6529 /* VMA recorded in the program header. */
6531 /* Size of this segment in memory. */
6535 # if defined PT_GETDSBT
6536 struct target_loadmap
6538 /* Protocol version number, must be zero. */
6540 /* Pointer to the DSBT table, its size, and the DSBT index. */
6541 unsigned *dsbt_table
;
6542 unsigned dsbt_size
, dsbt_index
;
6543 /* Number of segments in this map. */
6545 /* The actual memory map. */
6546 struct target_loadseg segs
[/*nsegs*/];
6548 # define LINUX_LOADMAP PT_GETDSBT
6549 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6550 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6552 struct target_loadmap
6554 /* Protocol version number, must be zero. */
6556 /* Number of segments in this map. */
6558 /* The actual memory map. */
6559 struct target_loadseg segs
[/*nsegs*/];
6561 # define LINUX_LOADMAP PTRACE_GETFDPIC
6562 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6563 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6567 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6568 unsigned char *myaddr
, unsigned int len
)
6570 int pid
= lwpid_of (current_thread
);
6572 struct target_loadmap
*data
= NULL
;
6573 unsigned int actual_length
, copy_length
;
6575 if (strcmp (annex
, "exec") == 0)
6576 addr
= (int) LINUX_LOADMAP_EXEC
;
6577 else if (strcmp (annex
, "interp") == 0)
6578 addr
= (int) LINUX_LOADMAP_INTERP
;
6582 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6588 actual_length
= sizeof (struct target_loadmap
)
6589 + sizeof (struct target_loadseg
) * data
->nsegs
;
6591 if (offset
< 0 || offset
> actual_length
)
6594 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6595 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6599 # define linux_read_loadmap NULL
6600 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6603 linux_process_qsupported (char **features
, int count
)
6605 if (the_low_target
.process_qsupported
!= NULL
)
6606 the_low_target
.process_qsupported (features
, count
);
6610 linux_supports_catch_syscall (void)
6612 return (the_low_target
.get_syscall_trapinfo
!= NULL
6613 && linux_supports_tracesysgood ());
6617 linux_get_ipa_tdesc_idx (void)
6619 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6622 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6626 linux_supports_tracepoints (void)
6628 if (*the_low_target
.supports_tracepoints
== NULL
)
6631 return (*the_low_target
.supports_tracepoints
) ();
6635 linux_read_pc (struct regcache
*regcache
)
6637 if (the_low_target
.get_pc
== NULL
)
6640 return (*the_low_target
.get_pc
) (regcache
);
6644 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6646 gdb_assert (the_low_target
.set_pc
!= NULL
);
6648 (*the_low_target
.set_pc
) (regcache
, pc
);
6652 linux_thread_stopped (struct thread_info
*thread
)
6654 return get_thread_lwp (thread
)->stopped
;
6657 /* This exposes stop-all-threads functionality to other modules. */
6660 linux_pause_all (int freeze
)
6662 stop_all_lwps (freeze
, NULL
);
6665 /* This exposes unstop-all-threads functionality to other gdbserver
6669 linux_unpause_all (int unfreeze
)
6671 unstop_all_lwps (unfreeze
, NULL
);
6675 linux_prepare_to_access_memory (void)
6677 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6680 linux_pause_all (1);
6685 linux_done_accessing_memory (void)
6687 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6690 linux_unpause_all (1);
6694 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6695 CORE_ADDR collector
,
6698 CORE_ADDR
*jump_entry
,
6699 CORE_ADDR
*trampoline
,
6700 ULONGEST
*trampoline_size
,
6701 unsigned char *jjump_pad_insn
,
6702 ULONGEST
*jjump_pad_insn_size
,
6703 CORE_ADDR
*adjusted_insn_addr
,
6704 CORE_ADDR
*adjusted_insn_addr_end
,
6707 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6708 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6709 jump_entry
, trampoline
, trampoline_size
,
6710 jjump_pad_insn
, jjump_pad_insn_size
,
6711 adjusted_insn_addr
, adjusted_insn_addr_end
,
6715 static struct emit_ops
*
6716 linux_emit_ops (void)
6718 if (the_low_target
.emit_ops
!= NULL
)
6719 return (*the_low_target
.emit_ops
) ();
6725 linux_get_min_fast_tracepoint_insn_len (void)
6727 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6730 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6733 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6734 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6736 char filename
[PATH_MAX
];
6738 const int auxv_size
= is_elf64
6739 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6740 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6742 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6744 fd
= open (filename
, O_RDONLY
);
6750 while (read (fd
, buf
, auxv_size
) == auxv_size
6751 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6755 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6757 switch (aux
->a_type
)
6760 *phdr_memaddr
= aux
->a_un
.a_val
;
6763 *num_phdr
= aux
->a_un
.a_val
;
6769 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6771 switch (aux
->a_type
)
6774 *phdr_memaddr
= aux
->a_un
.a_val
;
6777 *num_phdr
= aux
->a_un
.a_val
;
6785 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6787 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6788 "phdr_memaddr = %ld, phdr_num = %d",
6789 (long) *phdr_memaddr
, *num_phdr
);
6796 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6799 get_dynamic (const int pid
, const int is_elf64
)
6801 CORE_ADDR phdr_memaddr
, relocation
;
6803 unsigned char *phdr_buf
;
6804 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6806 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6809 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6810 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6812 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6815 /* Compute relocation: it is expected to be 0 for "regular" executables,
6816 non-zero for PIE ones. */
6818 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6821 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6823 if (p
->p_type
== PT_PHDR
)
6824 relocation
= phdr_memaddr
- p
->p_vaddr
;
6828 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6830 if (p
->p_type
== PT_PHDR
)
6831 relocation
= phdr_memaddr
- p
->p_vaddr
;
6834 if (relocation
== -1)
6836 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6837 any real world executables, including PIE executables, have always
6838 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6839 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6840 or present DT_DEBUG anyway (fpc binaries are statically linked).
6842 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6844 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6849 for (i
= 0; i
< num_phdr
; i
++)
6853 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6855 if (p
->p_type
== PT_DYNAMIC
)
6856 return p
->p_vaddr
+ relocation
;
6860 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6862 if (p
->p_type
== PT_DYNAMIC
)
6863 return p
->p_vaddr
+ relocation
;
6870 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6871 can be 0 if the inferior does not yet have the library list initialized.
6872 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6873 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6876 get_r_debug (const int pid
, const int is_elf64
)
6878 CORE_ADDR dynamic_memaddr
;
6879 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6880 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6883 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6884 if (dynamic_memaddr
== 0)
6887 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6891 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6892 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6896 unsigned char buf
[sizeof (Elf64_Xword
)];
6900 #ifdef DT_MIPS_RLD_MAP
6901 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6903 if (linux_read_memory (dyn
->d_un
.d_val
,
6904 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6909 #endif /* DT_MIPS_RLD_MAP */
6910 #ifdef DT_MIPS_RLD_MAP_REL
6911 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6913 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6914 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6919 #endif /* DT_MIPS_RLD_MAP_REL */
6921 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6922 map
= dyn
->d_un
.d_val
;
6924 if (dyn
->d_tag
== DT_NULL
)
6929 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6930 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6934 unsigned char buf
[sizeof (Elf32_Word
)];
6938 #ifdef DT_MIPS_RLD_MAP
6939 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6941 if (linux_read_memory (dyn
->d_un
.d_val
,
6942 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6947 #endif /* DT_MIPS_RLD_MAP */
6948 #ifdef DT_MIPS_RLD_MAP_REL
6949 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6951 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6952 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6957 #endif /* DT_MIPS_RLD_MAP_REL */
6959 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6960 map
= dyn
->d_un
.d_val
;
6962 if (dyn
->d_tag
== DT_NULL
)
6966 dynamic_memaddr
+= dyn_size
;
6972 /* Read one pointer from MEMADDR in the inferior. */
6975 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6979 /* Go through a union so this works on either big or little endian
6980 hosts, when the inferior's pointer size is smaller than the size
6981 of CORE_ADDR. It is assumed the inferior's endianness is the
6982 same of the superior's. */
6985 CORE_ADDR core_addr
;
6990 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6993 if (ptr_size
== sizeof (CORE_ADDR
))
6994 *ptr
= addr
.core_addr
;
6995 else if (ptr_size
== sizeof (unsigned int))
6998 gdb_assert_not_reached ("unhandled pointer size");
7003 struct link_map_offsets
7005 /* Offset and size of r_debug.r_version. */
7006 int r_version_offset
;
7008 /* Offset and size of r_debug.r_map. */
7011 /* Offset to l_addr field in struct link_map. */
7014 /* Offset to l_name field in struct link_map. */
7017 /* Offset to l_ld field in struct link_map. */
7020 /* Offset to l_next field in struct link_map. */
7023 /* Offset to l_prev field in struct link_map. */
7027 /* Construct qXfer:libraries-svr4:read reply. */
7030 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
7031 unsigned const char *writebuf
,
7032 CORE_ADDR offset
, int len
)
7035 unsigned document_len
;
7036 struct process_info_private
*const priv
= current_process ()->priv
;
7037 char filename
[PATH_MAX
];
7040 static const struct link_map_offsets lmo_32bit_offsets
=
7042 0, /* r_version offset. */
7043 4, /* r_debug.r_map offset. */
7044 0, /* l_addr offset in link_map. */
7045 4, /* l_name offset in link_map. */
7046 8, /* l_ld offset in link_map. */
7047 12, /* l_next offset in link_map. */
7048 16 /* l_prev offset in link_map. */
7051 static const struct link_map_offsets lmo_64bit_offsets
=
7053 0, /* r_version offset. */
7054 8, /* r_debug.r_map offset. */
7055 0, /* l_addr offset in link_map. */
7056 8, /* l_name offset in link_map. */
7057 16, /* l_ld offset in link_map. */
7058 24, /* l_next offset in link_map. */
7059 32 /* l_prev offset in link_map. */
7061 const struct link_map_offsets
*lmo
;
7062 unsigned int machine
;
7064 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7065 int allocated
= 1024;
7067 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7068 int header_done
= 0;
7070 if (writebuf
!= NULL
)
7072 if (readbuf
== NULL
)
7075 pid
= lwpid_of (current_thread
);
7076 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7077 is_elf64
= elf_64_file_p (filename
, &machine
);
7078 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7079 ptr_size
= is_elf64
? 8 : 4;
7081 while (annex
[0] != '\0')
7087 sep
= strchr (annex
, '=');
7092 if (len
== 5 && startswith (annex
, "start"))
7094 else if (len
== 4 && startswith (annex
, "prev"))
7098 annex
= strchr (sep
, ';');
7105 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7112 if (priv
->r_debug
== 0)
7113 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7115 /* We failed to find DT_DEBUG. Such situation will not change
7116 for this inferior - do not retry it. Report it to GDB as
7117 E01, see for the reasons at the GDB solib-svr4.c side. */
7118 if (priv
->r_debug
== (CORE_ADDR
) -1)
7121 if (priv
->r_debug
!= 0)
7123 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7124 (unsigned char *) &r_version
,
7125 sizeof (r_version
)) != 0
7128 warning ("unexpected r_debug version %d", r_version
);
7130 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7131 &lm_addr
, ptr_size
) != 0)
7133 warning ("unable to read r_map from 0x%lx",
7134 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7139 document
= (char *) xmalloc (allocated
);
7140 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7141 p
= document
+ strlen (document
);
7144 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7145 &l_name
, ptr_size
) == 0
7146 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7147 &l_addr
, ptr_size
) == 0
7148 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7149 &l_ld
, ptr_size
) == 0
7150 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7151 &l_prev
, ptr_size
) == 0
7152 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7153 &l_next
, ptr_size
) == 0)
7155 unsigned char libname
[PATH_MAX
];
7157 if (lm_prev
!= l_prev
)
7159 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7160 (long) lm_prev
, (long) l_prev
);
7164 /* Ignore the first entry even if it has valid name as the first entry
7165 corresponds to the main executable. The first entry should not be
7166 skipped if the dynamic loader was loaded late by a static executable
7167 (see solib-svr4.c parameter ignore_first). But in such case the main
7168 executable does not have PT_DYNAMIC present and this function already
7169 exited above due to failed get_r_debug. */
7172 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7177 /* Not checking for error because reading may stop before
7178 we've got PATH_MAX worth of characters. */
7180 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7181 libname
[sizeof (libname
) - 1] = '\0';
7182 if (libname
[0] != '\0')
7184 /* 6x the size for xml_escape_text below. */
7185 size_t len
= 6 * strlen ((char *) libname
);
7190 /* Terminate `<library-list-svr4'. */
7195 while (allocated
< p
- document
+ len
+ 200)
7197 /* Expand to guarantee sufficient storage. */
7198 uintptr_t document_len
= p
- document
;
7200 document
= (char *) xrealloc (document
, 2 * allocated
);
7202 p
= document
+ document_len
;
7205 name
= xml_escape_text ((char *) libname
);
7206 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7207 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7208 name
, (unsigned long) lm_addr
,
7209 (unsigned long) l_addr
, (unsigned long) l_ld
);
7220 /* Empty list; terminate `<library-list-svr4'. */
7224 strcpy (p
, "</library-list-svr4>");
7226 document_len
= strlen (document
);
7227 if (offset
< document_len
)
7228 document_len
-= offset
;
7231 if (len
> document_len
)
7234 memcpy (readbuf
, document
+ offset
, len
);
7240 #ifdef HAVE_LINUX_BTRACE
7242 /* See to_disable_btrace target method. */
7245 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7247 enum btrace_error err
;
7249 err
= linux_disable_btrace (tinfo
);
7250 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7253 /* Encode an Intel Processor Trace configuration. */
7256 linux_low_encode_pt_config (struct buffer
*buffer
,
7257 const struct btrace_data_pt_config
*config
)
7259 buffer_grow_str (buffer
, "<pt-config>\n");
7261 switch (config
->cpu
.vendor
)
7264 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7265 "model=\"%u\" stepping=\"%u\"/>\n",
7266 config
->cpu
.family
, config
->cpu
.model
,
7267 config
->cpu
.stepping
);
7274 buffer_grow_str (buffer
, "</pt-config>\n");
7277 /* Encode a raw buffer. */
7280 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7286 /* We use hex encoding - see common/rsp-low.h. */
7287 buffer_grow_str (buffer
, "<raw>\n");
7293 elem
[0] = tohex ((*data
>> 4) & 0xf);
7294 elem
[1] = tohex (*data
++ & 0xf);
7296 buffer_grow (buffer
, elem
, 2);
7299 buffer_grow_str (buffer
, "</raw>\n");
7302 /* See to_read_btrace target method. */
7305 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7306 enum btrace_read_type type
)
7308 struct btrace_data btrace
;
7309 struct btrace_block
*block
;
7310 enum btrace_error err
;
7313 btrace_data_init (&btrace
);
7315 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7316 if (err
!= BTRACE_ERR_NONE
)
7318 if (err
== BTRACE_ERR_OVERFLOW
)
7319 buffer_grow_str0 (buffer
, "E.Overflow.");
7321 buffer_grow_str0 (buffer
, "E.Generic Error.");
7326 switch (btrace
.format
)
7328 case BTRACE_FORMAT_NONE
:
7329 buffer_grow_str0 (buffer
, "E.No Trace.");
7332 case BTRACE_FORMAT_BTS
:
7333 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7334 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7337 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7339 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7340 paddress (block
->begin
), paddress (block
->end
));
7342 buffer_grow_str0 (buffer
, "</btrace>\n");
7345 case BTRACE_FORMAT_PT
:
7346 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7347 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7348 buffer_grow_str (buffer
, "<pt>\n");
7350 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7352 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7353 btrace
.variant
.pt
.size
);
7355 buffer_grow_str (buffer
, "</pt>\n");
7356 buffer_grow_str0 (buffer
, "</btrace>\n");
7360 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7364 btrace_data_fini (&btrace
);
7368 btrace_data_fini (&btrace
);
7372 /* See to_btrace_conf target method. */
7375 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7376 struct buffer
*buffer
)
7378 const struct btrace_config
*conf
;
7380 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7381 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7383 conf
= linux_btrace_conf (tinfo
);
7386 switch (conf
->format
)
7388 case BTRACE_FORMAT_NONE
:
7391 case BTRACE_FORMAT_BTS
:
7392 buffer_xml_printf (buffer
, "<bts");
7393 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7394 buffer_xml_printf (buffer
, " />\n");
7397 case BTRACE_FORMAT_PT
:
7398 buffer_xml_printf (buffer
, "<pt");
7399 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7400 buffer_xml_printf (buffer
, "/>\n");
7405 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7408 #endif /* HAVE_LINUX_BTRACE */
7410 /* See nat/linux-nat.h. */
7413 current_lwp_ptid (void)
7415 return ptid_of (current_thread
);
7418 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7421 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7423 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7424 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7426 return default_breakpoint_kind_from_pc (pcptr
);
7429 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7431 static const gdb_byte
*
7432 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7434 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7436 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7439 /* Implementation of the target_ops method
7440 "breakpoint_kind_from_current_state". */
7443 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7445 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7446 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7448 return linux_breakpoint_kind_from_pc (pcptr
);
7451 /* Default implementation of linux_target_ops method "set_pc" for
7452 32-bit pc register which is literally named "pc". */
7455 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7457 uint32_t newpc
= pc
;
7459 supply_register_by_name (regcache
, "pc", &newpc
);
7462 /* Default implementation of linux_target_ops method "get_pc" for
7463 32-bit pc register which is literally named "pc". */
7466 linux_get_pc_32bit (struct regcache
*regcache
)
7470 collect_register_by_name (regcache
, "pc", &pc
);
7472 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7476 /* Default implementation of linux_target_ops method "set_pc" for
7477 64-bit pc register which is literally named "pc". */
7480 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7482 uint64_t newpc
= pc
;
7484 supply_register_by_name (regcache
, "pc", &newpc
);
7487 /* Default implementation of linux_target_ops method "get_pc" for
7488 64-bit pc register which is literally named "pc". */
7491 linux_get_pc_64bit (struct regcache
*regcache
)
7495 collect_register_by_name (regcache
, "pc", &pc
);
7497 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7502 static struct target_ops linux_target_ops
= {
7503 linux_create_inferior
,
7504 linux_post_create_inferior
,
7513 linux_fetch_registers
,
7514 linux_store_registers
,
7515 linux_prepare_to_access_memory
,
7516 linux_done_accessing_memory
,
7519 linux_look_up_symbols
,
7520 linux_request_interrupt
,
7522 linux_supports_z_point_type
,
7525 linux_stopped_by_sw_breakpoint
,
7526 linux_supports_stopped_by_sw_breakpoint
,
7527 linux_stopped_by_hw_breakpoint
,
7528 linux_supports_stopped_by_hw_breakpoint
,
7529 linux_supports_hardware_single_step
,
7530 linux_stopped_by_watchpoint
,
7531 linux_stopped_data_address
,
7532 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7533 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7534 && defined(PT_TEXT_END_ADDR)
7539 #ifdef USE_THREAD_DB
7540 thread_db_get_tls_address
,
7545 hostio_last_error_from_errno
,
7548 linux_supports_non_stop
,
7550 linux_start_non_stop
,
7551 linux_supports_multi_process
,
7552 linux_supports_fork_events
,
7553 linux_supports_vfork_events
,
7554 linux_supports_exec_events
,
7555 linux_handle_new_gdb_connection
,
7556 #ifdef USE_THREAD_DB
7557 thread_db_handle_monitor_command
,
7561 linux_common_core_of_thread
,
7563 linux_process_qsupported
,
7564 linux_supports_tracepoints
,
7567 linux_thread_stopped
,
7571 linux_stabilize_threads
,
7572 linux_install_fast_tracepoint_jump_pad
,
7574 linux_supports_disable_randomization
,
7575 linux_get_min_fast_tracepoint_insn_len
,
7576 linux_qxfer_libraries_svr4
,
7577 linux_supports_agent
,
7578 #ifdef HAVE_LINUX_BTRACE
7579 linux_supports_btrace
,
7580 linux_enable_btrace
,
7581 linux_low_disable_btrace
,
7582 linux_low_read_btrace
,
7583 linux_low_btrace_conf
,
7591 linux_supports_range_stepping
,
7592 linux_proc_pid_to_exec_file
,
7593 linux_mntns_open_cloexec
,
7595 linux_mntns_readlink
,
7596 linux_breakpoint_kind_from_pc
,
7597 linux_sw_breakpoint_from_kind
,
7598 linux_proc_tid_get_name
,
7599 linux_breakpoint_kind_from_current_state
,
7600 linux_supports_software_single_step
,
7601 linux_supports_catch_syscall
,
7602 linux_get_ipa_tdesc_idx
,
7605 #ifdef HAVE_LINUX_REGSETS
7607 initialize_regsets_info (struct regsets_info
*info
)
7609 for (info
->num_regsets
= 0;
7610 info
->regsets
[info
->num_regsets
].size
>= 0;
7611 info
->num_regsets
++)
7617 initialize_low (void)
7619 struct sigaction sigchld_action
;
7621 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7622 set_target_ops (&linux_target_ops
);
7624 linux_ptrace_init_warnings ();
7626 sigchld_action
.sa_handler
= sigchld_handler
;
7627 sigemptyset (&sigchld_action
.sa_mask
);
7628 sigchld_action
.sa_flags
= SA_RESTART
;
7629 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7631 initialize_low_arch ();
7633 linux_check_ptrace_features ();