1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2017 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "linux-low.h"
21 #include "nat/linux-osdata.h"
25 #include "signals-state-save-restore.h"
26 #include "nat/linux-nat.h"
27 #include "nat/linux-waitpid.h"
29 #include "nat/gdb_ptrace.h"
30 #include "nat/linux-ptrace.h"
31 #include "nat/linux-procfs.h"
32 #include "nat/linux-personality.h"
34 #include <sys/ioctl.h>
37 #include <sys/syscall.h>
41 #include <sys/types.h>
46 #include "filestuff.h"
47 #include "tracepoint.h"
50 #include "common-inferior.h"
51 #include "nat/fork-inferior.h"
54 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
55 then ELFMAG0 will have been defined. If it didn't get included by
56 gdb_proc_service.h then including it will likely introduce a duplicate
57 definition of elf_fpregset_t. */
60 #include "nat/linux-namespaces.h"
63 #define SPUFS_MAGIC 0x23c9b64e
66 #ifdef HAVE_PERSONALITY
67 # include <sys/personality.h>
68 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
69 # define ADDR_NO_RANDOMIZE 0x0040000
77 /* Some targets did not define these ptrace constants from the start,
78 so gdbserver defines them locally here. In the future, these may
79 be removed after they are added to asm/ptrace.h. */
80 #if !(defined(PT_TEXT_ADDR) \
81 || defined(PT_DATA_ADDR) \
82 || defined(PT_TEXT_END_ADDR))
83 #if defined(__mcoldfire__)
84 /* These are still undefined in 3.10 kernels. */
85 #define PT_TEXT_ADDR 49*4
86 #define PT_DATA_ADDR 50*4
87 #define PT_TEXT_END_ADDR 51*4
88 /* BFIN already defines these since at least 2.6.32 kernels. */
90 #define PT_TEXT_ADDR 220
91 #define PT_TEXT_END_ADDR 224
92 #define PT_DATA_ADDR 228
93 /* These are still undefined in 3.10 kernels. */
94 #elif defined(__TMS320C6X__)
95 #define PT_TEXT_ADDR (0x10000*4)
96 #define PT_DATA_ADDR (0x10004*4)
97 #define PT_TEXT_END_ADDR (0x10008*4)
101 #ifdef HAVE_LINUX_BTRACE
102 # include "nat/linux-btrace.h"
103 # include "btrace-common.h"
106 #ifndef HAVE_ELF32_AUXV_T
107 /* Copied from glibc's elf.h. */
110 uint32_t a_type
; /* Entry type */
113 uint32_t a_val
; /* Integer value */
114 /* We use to have pointer elements added here. We cannot do that,
115 though, since it does not work when using 32-bit definitions
116 on 64-bit platforms and vice versa. */
121 #ifndef HAVE_ELF64_AUXV_T
122 /* Copied from glibc's elf.h. */
125 uint64_t a_type
; /* Entry type */
128 uint64_t a_val
; /* Integer value */
129 /* We use to have pointer elements added here. We cannot do that,
130 though, since it does not work when using 32-bit definitions
131 on 64-bit platforms and vice versa. */
136 /* Does the current host support PTRACE_GETREGSET? */
137 int have_ptrace_getregset
= -1;
141 /* See nat/linux-nat.h. */
144 ptid_of_lwp (struct lwp_info
*lwp
)
146 return ptid_of (get_lwp_thread (lwp
));
149 /* See nat/linux-nat.h. */
152 lwp_set_arch_private_info (struct lwp_info
*lwp
,
153 struct arch_lwp_info
*info
)
155 lwp
->arch_private
= info
;
158 /* See nat/linux-nat.h. */
160 struct arch_lwp_info
*
161 lwp_arch_private_info (struct lwp_info
*lwp
)
163 return lwp
->arch_private
;
166 /* See nat/linux-nat.h. */
169 lwp_is_stopped (struct lwp_info
*lwp
)
174 /* See nat/linux-nat.h. */
176 enum target_stop_reason
177 lwp_stop_reason (struct lwp_info
*lwp
)
179 return lwp
->stop_reason
;
182 /* See nat/linux-nat.h. */
185 lwp_is_stepping (struct lwp_info
*lwp
)
187 return lwp
->stepping
;
190 /* A list of all unknown processes which receive stop signals. Some
191 other process will presumably claim each of these as forked
192 children momentarily. */
194 struct simple_pid_list
196 /* The process ID. */
199 /* The status as reported by waitpid. */
203 struct simple_pid_list
*next
;
205 struct simple_pid_list
*stopped_pids
;
207 /* Trivial list manipulation functions to keep track of a list of new
208 stopped processes. */
211 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
213 struct simple_pid_list
*new_pid
= XNEW (struct simple_pid_list
);
216 new_pid
->status
= status
;
217 new_pid
->next
= *listp
;
222 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
224 struct simple_pid_list
**p
;
226 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
227 if ((*p
)->pid
== pid
)
229 struct simple_pid_list
*next
= (*p
)->next
;
231 *statusp
= (*p
)->status
;
239 enum stopping_threads_kind
241 /* Not stopping threads presently. */
242 NOT_STOPPING_THREADS
,
244 /* Stopping threads. */
247 /* Stopping and suspending threads. */
248 STOPPING_AND_SUSPENDING_THREADS
251 /* This is set while stop_all_lwps is in effect. */
252 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
254 /* FIXME make into a target method? */
255 int using_threads
= 1;
257 /* True if we're presently stabilizing threads (moving them out of
259 static int stabilizing_threads
;
261 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
262 int step
, int signal
, siginfo_t
*info
);
263 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
264 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
265 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
266 static void unsuspend_all_lwps (struct lwp_info
*except
);
267 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
268 int *wstat
, int options
);
269 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
270 static struct lwp_info
*add_lwp (ptid_t ptid
);
271 static void linux_mourn (struct process_info
*process
);
272 static int linux_stopped_by_watchpoint (void);
273 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
274 static int lwp_is_marked_dead (struct lwp_info
*lwp
);
275 static void proceed_all_lwps (void);
276 static int finish_step_over (struct lwp_info
*lwp
);
277 static int kill_lwp (unsigned long lwpid
, int signo
);
278 static void enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
);
279 static void complete_ongoing_step_over (void);
280 static int linux_low_ptrace_options (int attached
);
281 static int check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
);
282 static int proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
);
284 /* When the event-loop is doing a step-over, this points at the thread
286 ptid_t step_over_bkpt
;
288 /* True if the low target can hardware single-step. */
291 can_hardware_single_step (void)
293 if (the_low_target
.supports_hardware_single_step
!= NULL
)
294 return the_low_target
.supports_hardware_single_step ();
299 /* True if the low target can software single-step. Such targets
300 implement the GET_NEXT_PCS callback. */
303 can_software_single_step (void)
305 return (the_low_target
.get_next_pcs
!= NULL
);
308 /* True if the low target supports memory breakpoints. If so, we'll
309 have a GET_PC implementation. */
312 supports_breakpoints (void)
314 return (the_low_target
.get_pc
!= NULL
);
317 /* Returns true if this target can support fast tracepoints. This
318 does not mean that the in-process agent has been loaded in the
322 supports_fast_tracepoints (void)
324 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
327 /* True if LWP is stopped in its stepping range. */
330 lwp_in_step_range (struct lwp_info
*lwp
)
332 CORE_ADDR pc
= lwp
->stop_pc
;
334 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
337 struct pending_signals
341 struct pending_signals
*prev
;
344 /* The read/write ends of the pipe registered as waitable file in the
346 static int linux_event_pipe
[2] = { -1, -1 };
348 /* True if we're currently in async mode. */
349 #define target_is_async_p() (linux_event_pipe[0] != -1)
351 static void send_sigstop (struct lwp_info
*lwp
);
352 static void wait_for_sigstop (void);
354 /* Return non-zero if HEADER is a 64-bit ELF file. */
357 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
359 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
360 && header
->e_ident
[EI_MAG1
] == ELFMAG1
361 && header
->e_ident
[EI_MAG2
] == ELFMAG2
362 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
364 *machine
= header
->e_machine
;
365 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
372 /* Return non-zero if FILE is a 64-bit ELF file,
373 zero if the file is not a 64-bit ELF file,
374 and -1 if the file is not accessible or doesn't exist. */
377 elf_64_file_p (const char *file
, unsigned int *machine
)
382 fd
= open (file
, O_RDONLY
);
386 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
393 return elf_64_header_p (&header
, machine
);
396 /* Accepts an integer PID; Returns true if the executable PID is
397 running is a 64-bit ELF file.. */
400 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
404 sprintf (file
, "/proc/%d/exe", pid
);
405 return elf_64_file_p (file
, machine
);
409 delete_lwp (struct lwp_info
*lwp
)
411 struct thread_info
*thr
= get_lwp_thread (lwp
);
414 debug_printf ("deleting %ld\n", lwpid_of (thr
));
417 free (lwp
->arch_private
);
421 /* Add a process to the common process list, and set its private
424 static struct process_info
*
425 linux_add_process (int pid
, int attached
)
427 struct process_info
*proc
;
429 proc
= add_process (pid
, attached
);
430 proc
->priv
= XCNEW (struct process_info_private
);
432 if (the_low_target
.new_process
!= NULL
)
433 proc
->priv
->arch_private
= the_low_target
.new_process ();
438 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
440 /* Call the target arch_setup function on the current thread. */
443 linux_arch_setup (void)
445 the_low_target
.arch_setup ();
448 /* Call the target arch_setup function on THREAD. */
451 linux_arch_setup_thread (struct thread_info
*thread
)
453 struct thread_info
*saved_thread
;
455 saved_thread
= current_thread
;
456 current_thread
= thread
;
460 current_thread
= saved_thread
;
463 /* Handle a GNU/Linux extended wait response. If we see a clone,
464 fork, or vfork event, we need to add the new LWP to our list
465 (and return 0 so as not to report the trap to higher layers).
466 If we see an exec event, we will modify ORIG_EVENT_LWP to point
467 to a new LWP representing the new program. */
470 handle_extended_wait (struct lwp_info
**orig_event_lwp
, int wstat
)
472 struct lwp_info
*event_lwp
= *orig_event_lwp
;
473 int event
= linux_ptrace_get_extended_event (wstat
);
474 struct thread_info
*event_thr
= get_lwp_thread (event_lwp
);
475 struct lwp_info
*new_lwp
;
477 gdb_assert (event_lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
479 /* All extended events we currently use are mid-syscall. Only
480 PTRACE_EVENT_STOP is delivered more like a signal-stop, but
481 you have to be using PTRACE_SEIZE to get that. */
482 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
484 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
485 || (event
== PTRACE_EVENT_CLONE
))
488 unsigned long new_pid
;
491 /* Get the pid of the new lwp. */
492 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
495 /* If we haven't already seen the new PID stop, wait for it now. */
496 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
498 /* The new child has a pending SIGSTOP. We can't affect it until it
499 hits the SIGSTOP, but we're already attached. */
501 ret
= my_waitpid (new_pid
, &status
, __WALL
);
504 perror_with_name ("waiting for new child");
505 else if (ret
!= new_pid
)
506 warning ("wait returned unexpected PID %d", ret
);
507 else if (!WIFSTOPPED (status
))
508 warning ("wait returned unexpected status 0x%x", status
);
511 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
513 struct process_info
*parent_proc
;
514 struct process_info
*child_proc
;
515 struct lwp_info
*child_lwp
;
516 struct thread_info
*child_thr
;
517 struct target_desc
*tdesc
;
519 ptid
= ptid_build (new_pid
, new_pid
, 0);
523 debug_printf ("HEW: Got fork event from LWP %ld, "
525 ptid_get_lwp (ptid_of (event_thr
)),
526 ptid_get_pid (ptid
));
529 /* Add the new process to the tables and clone the breakpoint
530 lists of the parent. We need to do this even if the new process
531 will be detached, since we will need the process object and the
532 breakpoints to remove any breakpoints from memory when we
533 detach, and the client side will access registers. */
534 child_proc
= linux_add_process (new_pid
, 0);
535 gdb_assert (child_proc
!= NULL
);
536 child_lwp
= add_lwp (ptid
);
537 gdb_assert (child_lwp
!= NULL
);
538 child_lwp
->stopped
= 1;
539 child_lwp
->must_set_ptrace_flags
= 1;
540 child_lwp
->status_pending_p
= 0;
541 child_thr
= get_lwp_thread (child_lwp
);
542 child_thr
->last_resume_kind
= resume_stop
;
543 child_thr
->last_status
.kind
= TARGET_WAITKIND_STOPPED
;
545 /* If we're suspending all threads, leave this one suspended
546 too. If the fork/clone parent is stepping over a breakpoint,
547 all other threads have been suspended already. Leave the
548 child suspended too. */
549 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
550 || event_lwp
->bp_reinsert
!= 0)
553 debug_printf ("HEW: leaving child suspended\n");
554 child_lwp
->suspended
= 1;
557 parent_proc
= get_thread_process (event_thr
);
558 child_proc
->attached
= parent_proc
->attached
;
560 if (event_lwp
->bp_reinsert
!= 0
561 && can_software_single_step ()
562 && event
== PTRACE_EVENT_VFORK
)
564 /* If we leave single-step breakpoints there, child will
565 hit it, so uninsert single-step breakpoints from parent
566 (and child). Once vfork child is done, reinsert
567 them back to parent. */
568 uninsert_single_step_breakpoints (event_thr
);
571 clone_all_breakpoints (child_thr
, event_thr
);
573 tdesc
= XNEW (struct target_desc
);
574 copy_target_description (tdesc
, parent_proc
->tdesc
);
575 child_proc
->tdesc
= tdesc
;
577 /* Clone arch-specific process data. */
578 if (the_low_target
.new_fork
!= NULL
)
579 the_low_target
.new_fork (parent_proc
, child_proc
);
581 /* Save fork info in the parent thread. */
582 if (event
== PTRACE_EVENT_FORK
)
583 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
584 else if (event
== PTRACE_EVENT_VFORK
)
585 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
587 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
589 /* The status_pending field contains bits denoting the
590 extended event, so when the pending event is handled,
591 the handler will look at lwp->waitstatus. */
592 event_lwp
->status_pending_p
= 1;
593 event_lwp
->status_pending
= wstat
;
595 /* Link the threads until the parent event is passed on to
597 event_lwp
->fork_relative
= child_lwp
;
598 child_lwp
->fork_relative
= event_lwp
;
600 /* If the parent thread is doing step-over with single-step
601 breakpoints, the list of single-step breakpoints are cloned
602 from the parent's. Remove them from the child process.
603 In case of vfork, we'll reinsert them back once vforked
605 if (event_lwp
->bp_reinsert
!= 0
606 && can_software_single_step ())
608 /* The child process is forked and stopped, so it is safe
609 to access its memory without stopping all other threads
610 from other processes. */
611 delete_single_step_breakpoints (child_thr
);
613 gdb_assert (has_single_step_breakpoints (event_thr
));
614 gdb_assert (!has_single_step_breakpoints (child_thr
));
617 /* Report the event. */
622 debug_printf ("HEW: Got clone event "
623 "from LWP %ld, new child is LWP %ld\n",
624 lwpid_of (event_thr
), new_pid
);
626 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
627 new_lwp
= add_lwp (ptid
);
629 /* Either we're going to immediately resume the new thread
630 or leave it stopped. linux_resume_one_lwp is a nop if it
631 thinks the thread is currently running, so set this first
632 before calling linux_resume_one_lwp. */
633 new_lwp
->stopped
= 1;
635 /* If we're suspending all threads, leave this one suspended
636 too. If the fork/clone parent is stepping over a breakpoint,
637 all other threads have been suspended already. Leave the
638 child suspended too. */
639 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
640 || event_lwp
->bp_reinsert
!= 0)
641 new_lwp
->suspended
= 1;
643 /* Normally we will get the pending SIGSTOP. But in some cases
644 we might get another signal delivered to the group first.
645 If we do get another signal, be sure not to lose it. */
646 if (WSTOPSIG (status
) != SIGSTOP
)
648 new_lwp
->stop_expected
= 1;
649 new_lwp
->status_pending_p
= 1;
650 new_lwp
->status_pending
= status
;
652 else if (report_thread_events
)
654 new_lwp
->waitstatus
.kind
= TARGET_WAITKIND_THREAD_CREATED
;
655 new_lwp
->status_pending_p
= 1;
656 new_lwp
->status_pending
= status
;
659 /* Don't report the event. */
662 else if (event
== PTRACE_EVENT_VFORK_DONE
)
664 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
666 if (event_lwp
->bp_reinsert
!= 0 && can_software_single_step ())
668 reinsert_single_step_breakpoints (event_thr
);
670 gdb_assert (has_single_step_breakpoints (event_thr
));
673 /* Report the event. */
676 else if (event
== PTRACE_EVENT_EXEC
&& report_exec_events
)
678 struct process_info
*proc
;
679 VEC (int) *syscalls_to_catch
;
685 debug_printf ("HEW: Got exec event from LWP %ld\n",
686 lwpid_of (event_thr
));
689 /* Get the event ptid. */
690 event_ptid
= ptid_of (event_thr
);
691 event_pid
= ptid_get_pid (event_ptid
);
693 /* Save the syscall list from the execing process. */
694 proc
= get_thread_process (event_thr
);
695 syscalls_to_catch
= proc
->syscalls_to_catch
;
696 proc
->syscalls_to_catch
= NULL
;
698 /* Delete the execing process and all its threads. */
700 current_thread
= NULL
;
702 /* Create a new process/lwp/thread. */
703 proc
= linux_add_process (event_pid
, 0);
704 event_lwp
= add_lwp (event_ptid
);
705 event_thr
= get_lwp_thread (event_lwp
);
706 gdb_assert (current_thread
== event_thr
);
707 linux_arch_setup_thread (event_thr
);
709 /* Set the event status. */
710 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
711 event_lwp
->waitstatus
.value
.execd_pathname
712 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
714 /* Mark the exec status as pending. */
715 event_lwp
->stopped
= 1;
716 event_lwp
->status_pending_p
= 1;
717 event_lwp
->status_pending
= wstat
;
718 event_thr
->last_resume_kind
= resume_continue
;
719 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
721 /* Update syscall state in the new lwp, effectively mid-syscall too. */
722 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
724 /* Restore the list to catch. Don't rely on the client, which is free
725 to avoid sending a new list when the architecture doesn't change.
726 Also, for ANY_SYSCALL, the architecture doesn't really matter. */
727 proc
->syscalls_to_catch
= syscalls_to_catch
;
729 /* Report the event. */
730 *orig_event_lwp
= event_lwp
;
734 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
737 /* Return the PC as read from the regcache of LWP, without any
741 get_pc (struct lwp_info
*lwp
)
743 struct thread_info
*saved_thread
;
744 struct regcache
*regcache
;
747 if (the_low_target
.get_pc
== NULL
)
750 saved_thread
= current_thread
;
751 current_thread
= get_lwp_thread (lwp
);
753 regcache
= get_thread_regcache (current_thread
, 1);
754 pc
= (*the_low_target
.get_pc
) (regcache
);
757 debug_printf ("pc is 0x%lx\n", (long) pc
);
759 current_thread
= saved_thread
;
763 /* This function should only be called if LWP got a SYSCALL_SIGTRAP.
764 Fill *SYSNO with the syscall nr trapped. */
767 get_syscall_trapinfo (struct lwp_info
*lwp
, int *sysno
)
769 struct thread_info
*saved_thread
;
770 struct regcache
*regcache
;
772 if (the_low_target
.get_syscall_trapinfo
== NULL
)
774 /* If we cannot get the syscall trapinfo, report an unknown
775 system call number. */
776 *sysno
= UNKNOWN_SYSCALL
;
780 saved_thread
= current_thread
;
781 current_thread
= get_lwp_thread (lwp
);
783 regcache
= get_thread_regcache (current_thread
, 1);
784 (*the_low_target
.get_syscall_trapinfo
) (regcache
, sysno
);
787 debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno
);
789 current_thread
= saved_thread
;
792 static int check_stopped_by_watchpoint (struct lwp_info
*child
);
794 /* Called when the LWP stopped for a signal/trap. If it stopped for a
795 trap check what caused it (breakpoint, watchpoint, trace, etc.),
796 and save the result in the LWP's stop_reason field. If it stopped
797 for a breakpoint, decrement the PC if necessary on the lwp's
798 architecture. Returns true if we now have the LWP's stop PC. */
801 save_stop_reason (struct lwp_info
*lwp
)
804 CORE_ADDR sw_breakpoint_pc
;
805 struct thread_info
*saved_thread
;
806 #if USE_SIGTRAP_SIGINFO
810 if (the_low_target
.get_pc
== NULL
)
814 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
816 /* breakpoint_at reads from the current thread. */
817 saved_thread
= current_thread
;
818 current_thread
= get_lwp_thread (lwp
);
820 #if USE_SIGTRAP_SIGINFO
821 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
822 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
824 if (siginfo
.si_signo
== SIGTRAP
)
826 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
)
827 && GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
829 /* The si_code is ambiguous on this arch -- check debug
831 if (!check_stopped_by_watchpoint (lwp
))
832 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
834 else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
836 /* If we determine the LWP stopped for a SW breakpoint,
837 trust it. Particularly don't check watchpoint
838 registers, because at least on s390, we'd find
839 stopped-by-watchpoint as long as there's a watchpoint
841 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
843 else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
845 /* This can indicate either a hardware breakpoint or
846 hardware watchpoint. Check debug registers. */
847 if (!check_stopped_by_watchpoint (lwp
))
848 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
850 else if (siginfo
.si_code
== TRAP_TRACE
)
852 /* We may have single stepped an instruction that
853 triggered a watchpoint. In that case, on some
854 architectures (such as x86), instead of TRAP_HWBKPT,
855 si_code indicates TRAP_TRACE, and we need to check
856 the debug registers separately. */
857 if (!check_stopped_by_watchpoint (lwp
))
858 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
863 /* We may have just stepped a breakpoint instruction. E.g., in
864 non-stop mode, GDB first tells the thread A to step a range, and
865 then the user inserts a breakpoint inside the range. In that
866 case we need to report the breakpoint PC. */
867 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
868 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
869 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
871 if (hardware_breakpoint_inserted_here (pc
))
872 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
874 if (lwp
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
)
875 check_stopped_by_watchpoint (lwp
);
878 if (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
882 struct thread_info
*thr
= get_lwp_thread (lwp
);
884 debug_printf ("CSBB: %s stopped by software breakpoint\n",
885 target_pid_to_str (ptid_of (thr
)));
888 /* Back up the PC if necessary. */
889 if (pc
!= sw_breakpoint_pc
)
891 struct regcache
*regcache
892 = get_thread_regcache (current_thread
, 1);
893 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
896 /* Update this so we record the correct stop PC below. */
897 pc
= sw_breakpoint_pc
;
899 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
)
903 struct thread_info
*thr
= get_lwp_thread (lwp
);
905 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
906 target_pid_to_str (ptid_of (thr
)));
909 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
913 struct thread_info
*thr
= get_lwp_thread (lwp
);
915 debug_printf ("CSBB: %s stopped by hardware watchpoint\n",
916 target_pid_to_str (ptid_of (thr
)));
919 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
)
923 struct thread_info
*thr
= get_lwp_thread (lwp
);
925 debug_printf ("CSBB: %s stopped by trace\n",
926 target_pid_to_str (ptid_of (thr
)));
931 current_thread
= saved_thread
;
935 static struct lwp_info
*
936 add_lwp (ptid_t ptid
)
938 struct lwp_info
*lwp
;
940 lwp
= XCNEW (struct lwp_info
);
942 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
944 if (the_low_target
.new_thread
!= NULL
)
945 the_low_target
.new_thread (lwp
);
947 lwp
->thread
= add_thread (ptid
, lwp
);
952 /* Callback to be used when calling fork_inferior, responsible for
953 actually initiating the tracing of the inferior. */
958 if (ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0,
959 (PTRACE_TYPE_ARG4
) 0) < 0)
960 trace_start_error_with_name ("ptrace");
962 if (setpgid (0, 0) < 0)
963 trace_start_error_with_name ("setpgid");
965 /* If GDBserver is connected to gdb via stdio, redirect the inferior's
966 stdout to stderr so that inferior i/o doesn't corrupt the connection.
967 Also, redirect stdin to /dev/null. */
968 if (remote_connection_is_stdio ())
971 trace_start_error_with_name ("close");
972 if (open ("/dev/null", O_RDONLY
) < 0)
973 trace_start_error_with_name ("open");
975 trace_start_error_with_name ("dup2");
976 if (write (2, "stdin/stdout redirected\n",
977 sizeof ("stdin/stdout redirected\n") - 1) < 0)
979 /* Errors ignored. */;
984 /* Start an inferior process and returns its pid.
985 PROGRAM is the name of the program to be started, and PROGRAM_ARGS
986 are its arguments. */
989 linux_create_inferior (const char *program
,
990 const std::vector
<char *> &program_args
)
992 struct lwp_info
*new_lwp
;
995 struct cleanup
*restore_personality
996 = maybe_disable_address_space_randomization (disable_randomization
);
997 std::string str_program_args
= stringify_argv (program_args
);
999 pid
= fork_inferior (program
,
1000 str_program_args
.c_str (),
1001 get_environ ()->envp (), linux_ptrace_fun
,
1002 NULL
, NULL
, NULL
, NULL
);
1004 do_cleanups (restore_personality
);
1006 linux_add_process (pid
, 0);
1008 ptid
= ptid_build (pid
, pid
, 0);
1009 new_lwp
= add_lwp (ptid
);
1010 new_lwp
->must_set_ptrace_flags
= 1;
1012 post_fork_inferior (pid
, program
);
1017 /* Implement the post_create_inferior target_ops method. */
1020 linux_post_create_inferior (void)
1022 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
1024 linux_arch_setup ();
1026 if (lwp
->must_set_ptrace_flags
)
1028 struct process_info
*proc
= current_process ();
1029 int options
= linux_low_ptrace_options (proc
->attached
);
1031 linux_enable_event_reporting (lwpid_of (current_thread
), options
);
1032 lwp
->must_set_ptrace_flags
= 0;
1036 /* Attach to an inferior process. Returns 0 on success, ERRNO on
1040 linux_attach_lwp (ptid_t ptid
)
1042 struct lwp_info
*new_lwp
;
1043 int lwpid
= ptid_get_lwp (ptid
);
1045 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
1049 new_lwp
= add_lwp (ptid
);
1051 /* We need to wait for SIGSTOP before being able to make the next
1052 ptrace call on this LWP. */
1053 new_lwp
->must_set_ptrace_flags
= 1;
1055 if (linux_proc_pid_is_stopped (lwpid
))
1058 debug_printf ("Attached to a stopped process\n");
1060 /* The process is definitely stopped. It is in a job control
1061 stop, unless the kernel predates the TASK_STOPPED /
1062 TASK_TRACED distinction, in which case it might be in a
1063 ptrace stop. Make sure it is in a ptrace stop; from there we
1064 can kill it, signal it, et cetera.
1066 First make sure there is a pending SIGSTOP. Since we are
1067 already attached, the process can not transition from stopped
1068 to running without a PTRACE_CONT; so we know this signal will
1069 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1070 probably already in the queue (unless this kernel is old
1071 enough to use TASK_STOPPED for ptrace stops); but since
1072 SIGSTOP is not an RT signal, it can only be queued once. */
1073 kill_lwp (lwpid
, SIGSTOP
);
1075 /* Finally, resume the stopped process. This will deliver the
1076 SIGSTOP (or a higher priority signal, just like normal
1077 PTRACE_ATTACH), which we'll catch later on. */
1078 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1081 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
1082 brings it to a halt.
1084 There are several cases to consider here:
1086 1) gdbserver has already attached to the process and is being notified
1087 of a new thread that is being created.
1088 In this case we should ignore that SIGSTOP and resume the
1089 process. This is handled below by setting stop_expected = 1,
1090 and the fact that add_thread sets last_resume_kind ==
1093 2) This is the first thread (the process thread), and we're attaching
1094 to it via attach_inferior.
1095 In this case we want the process thread to stop.
1096 This is handled by having linux_attach set last_resume_kind ==
1097 resume_stop after we return.
1099 If the pid we are attaching to is also the tgid, we attach to and
1100 stop all the existing threads. Otherwise, we attach to pid and
1101 ignore any other threads in the same group as this pid.
1103 3) GDB is connecting to gdbserver and is requesting an enumeration of all
1105 In this case we want the thread to stop.
1106 FIXME: This case is currently not properly handled.
1107 We should wait for the SIGSTOP but don't. Things work apparently
1108 because enough time passes between when we ptrace (ATTACH) and when
1109 gdb makes the next ptrace call on the thread.
1111 On the other hand, if we are currently trying to stop all threads, we
1112 should treat the new thread as if we had sent it a SIGSTOP. This works
1113 because we are guaranteed that the add_lwp call above added us to the
1114 end of the list, and so the new thread has not yet reached
1115 wait_for_sigstop (but will). */
1116 new_lwp
->stop_expected
= 1;
1121 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
1122 already attached. Returns true if a new LWP is found, false
1126 attach_proc_task_lwp_callback (ptid_t ptid
)
1128 /* Is this a new thread? */
1129 if (find_thread_ptid (ptid
) == NULL
)
1131 int lwpid
= ptid_get_lwp (ptid
);
1135 debug_printf ("Found new lwp %d\n", lwpid
);
1137 err
= linux_attach_lwp (ptid
);
1139 /* Be quiet if we simply raced with the thread exiting. EPERM
1140 is returned if the thread's task still exists, and is marked
1141 as exited or zombie, as well as other conditions, so in that
1142 case, confirm the status in /proc/PID/status. */
1144 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1148 debug_printf ("Cannot attach to lwp %d: "
1149 "thread is gone (%d: %s)\n",
1150 lwpid
, err
, strerror (err
));
1155 warning (_("Cannot attach to lwp %d: %s"),
1157 linux_ptrace_attach_fail_reason_string (ptid
, err
));
1165 static void async_file_mark (void);
1167 /* Attach to PID. If PID is the tgid, attach to it and all
1171 linux_attach (unsigned long pid
)
1173 struct process_info
*proc
;
1174 struct thread_info
*initial_thread
;
1175 ptid_t ptid
= ptid_build (pid
, pid
, 0);
1178 /* Attach to PID. We will check for other threads
1180 err
= linux_attach_lwp (ptid
);
1182 error ("Cannot attach to process %ld: %s",
1183 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
1185 proc
= linux_add_process (pid
, 1);
1187 /* Don't ignore the initial SIGSTOP if we just attached to this
1188 process. It will be collected by wait shortly. */
1189 initial_thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
1190 initial_thread
->last_resume_kind
= resume_stop
;
1192 /* We must attach to every LWP. If /proc is mounted, use that to
1193 find them now. On the one hand, the inferior may be using raw
1194 clone instead of using pthreads. On the other hand, even if it
1195 is using pthreads, GDB may not be connected yet (thread_db needs
1196 to do symbol lookups, through qSymbol). Also, thread_db walks
1197 structures in the inferior's address space to find the list of
1198 threads/LWPs, and those structures may well be corrupted. Note
1199 that once thread_db is loaded, we'll still use it to list threads
1200 and associate pthread info with each LWP. */
1201 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1203 /* GDB will shortly read the xml target description for this
1204 process, to figure out the process' architecture. But the target
1205 description is only filled in when the first process/thread in
1206 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1207 that now, otherwise, if GDB is fast enough, it could read the
1208 target description _before_ that initial stop. */
1211 struct lwp_info
*lwp
;
1213 ptid_t pid_ptid
= pid_to_ptid (pid
);
1215 lwpid
= linux_wait_for_event_filtered (pid_ptid
, pid_ptid
,
1217 gdb_assert (lwpid
> 0);
1219 lwp
= find_lwp_pid (pid_to_ptid (lwpid
));
1221 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGSTOP
)
1223 lwp
->status_pending_p
= 1;
1224 lwp
->status_pending
= wstat
;
1227 initial_thread
->last_resume_kind
= resume_continue
;
1231 gdb_assert (proc
->tdesc
!= NULL
);
1244 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
1246 struct counter
*counter
= (struct counter
*) args
;
1248 if (ptid_get_pid (entry
->id
) == counter
->pid
)
1250 if (++counter
->count
> 1)
1258 last_thread_of_process_p (int pid
)
1260 struct counter counter
= { pid
, 0 };
1262 return (find_inferior (&all_threads
,
1263 second_thread_of_pid_p
, &counter
) == NULL
);
1269 linux_kill_one_lwp (struct lwp_info
*lwp
)
1271 struct thread_info
*thr
= get_lwp_thread (lwp
);
1272 int pid
= lwpid_of (thr
);
1274 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1275 there is no signal context, and ptrace(PTRACE_KILL) (or
1276 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1277 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1278 alternative is to kill with SIGKILL. We only need one SIGKILL
1279 per process, not one for each thread. But since we still support
1280 support debugging programs using raw clone without CLONE_THREAD,
1281 we send one for each thread. For years, we used PTRACE_KILL
1282 only, so we're being a bit paranoid about some old kernels where
1283 PTRACE_KILL might work better (dubious if there are any such, but
1284 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1285 second, and so we're fine everywhere. */
1288 kill_lwp (pid
, SIGKILL
);
1291 int save_errno
= errno
;
1293 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1294 target_pid_to_str (ptid_of (thr
)),
1295 save_errno
? strerror (save_errno
) : "OK");
1299 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1302 int save_errno
= errno
;
1304 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1305 target_pid_to_str (ptid_of (thr
)),
1306 save_errno
? strerror (save_errno
) : "OK");
1310 /* Kill LWP and wait for it to die. */
1313 kill_wait_lwp (struct lwp_info
*lwp
)
1315 struct thread_info
*thr
= get_lwp_thread (lwp
);
1316 int pid
= ptid_get_pid (ptid_of (thr
));
1317 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1322 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1326 linux_kill_one_lwp (lwp
);
1328 /* Make sure it died. Notes:
1330 - The loop is most likely unnecessary.
1332 - We don't use linux_wait_for_event as that could delete lwps
1333 while we're iterating over them. We're not interested in
1334 any pending status at this point, only in making sure all
1335 wait status on the kernel side are collected until the
1338 - We don't use __WALL here as the __WALL emulation relies on
1339 SIGCHLD, and killing a stopped process doesn't generate
1340 one, nor an exit status.
1342 res
= my_waitpid (lwpid
, &wstat
, 0);
1343 if (res
== -1 && errno
== ECHILD
)
1344 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1345 } while (res
> 0 && WIFSTOPPED (wstat
));
1347 /* Even if it was stopped, the child may have already disappeared.
1348 E.g., if it was killed by SIGKILL. */
1349 if (res
< 0 && errno
!= ECHILD
)
1350 perror_with_name ("kill_wait_lwp");
1353 /* Callback for `find_inferior'. Kills an lwp of a given process,
1354 except the leader. */
1357 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1359 struct thread_info
*thread
= (struct thread_info
*) entry
;
1360 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1361 int pid
= * (int *) args
;
1363 if (ptid_get_pid (entry
->id
) != pid
)
1366 /* We avoid killing the first thread here, because of a Linux kernel (at
1367 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1368 the children get a chance to be reaped, it will remain a zombie
1371 if (lwpid_of (thread
) == pid
)
1374 debug_printf ("lkop: is last of process %s\n",
1375 target_pid_to_str (entry
->id
));
1379 kill_wait_lwp (lwp
);
1384 linux_kill (int pid
)
1386 struct process_info
*process
;
1387 struct lwp_info
*lwp
;
1389 process
= find_process_pid (pid
);
1390 if (process
== NULL
)
1393 /* If we're killing a running inferior, make sure it is stopped
1394 first, as PTRACE_KILL will not work otherwise. */
1395 stop_all_lwps (0, NULL
);
1397 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1399 /* See the comment in linux_kill_one_lwp. We did not kill the first
1400 thread in the list, so do so now. */
1401 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1406 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1410 kill_wait_lwp (lwp
);
1412 the_target
->mourn (process
);
1414 /* Since we presently can only stop all lwps of all processes, we
1415 need to unstop lwps of other processes. */
1416 unstop_all_lwps (0, NULL
);
1420 /* Get pending signal of THREAD, for detaching purposes. This is the
1421 signal the thread last stopped for, which we need to deliver to the
1422 thread when detaching, otherwise, it'd be suppressed/lost. */
1425 get_detach_signal (struct thread_info
*thread
)
1427 enum gdb_signal signo
= GDB_SIGNAL_0
;
1429 struct lwp_info
*lp
= get_thread_lwp (thread
);
1431 if (lp
->status_pending_p
)
1432 status
= lp
->status_pending
;
1435 /* If the thread had been suspended by gdbserver, and it stopped
1436 cleanly, then it'll have stopped with SIGSTOP. But we don't
1437 want to deliver that SIGSTOP. */
1438 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1439 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1442 /* Otherwise, we may need to deliver the signal we
1444 status
= lp
->last_status
;
1447 if (!WIFSTOPPED (status
))
1450 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1451 target_pid_to_str (ptid_of (thread
)));
1455 /* Extended wait statuses aren't real SIGTRAPs. */
1456 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1459 debug_printf ("GPS: lwp %s had stopped with extended "
1460 "status: no pending signal\n",
1461 target_pid_to_str (ptid_of (thread
)));
1465 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1467 if (program_signals_p
&& !program_signals
[signo
])
1470 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1471 target_pid_to_str (ptid_of (thread
)),
1472 gdb_signal_to_string (signo
));
1475 else if (!program_signals_p
1476 /* If we have no way to know which signals GDB does not
1477 want to have passed to the program, assume
1478 SIGTRAP/SIGINT, which is GDB's default. */
1479 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1482 debug_printf ("GPS: lwp %s had signal %s, "
1483 "but we don't know if we should pass it. "
1484 "Default to not.\n",
1485 target_pid_to_str (ptid_of (thread
)),
1486 gdb_signal_to_string (signo
));
1492 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1493 target_pid_to_str (ptid_of (thread
)),
1494 gdb_signal_to_string (signo
));
1496 return WSTOPSIG (status
);
1500 /* Detach from LWP. */
1503 linux_detach_one_lwp (struct lwp_info
*lwp
)
1505 struct thread_info
*thread
= get_lwp_thread (lwp
);
1509 /* If there is a pending SIGSTOP, get rid of it. */
1510 if (lwp
->stop_expected
)
1513 debug_printf ("Sending SIGCONT to %s\n",
1514 target_pid_to_str (ptid_of (thread
)));
1516 kill_lwp (lwpid_of (thread
), SIGCONT
);
1517 lwp
->stop_expected
= 0;
1520 /* Pass on any pending signal for this thread. */
1521 sig
= get_detach_signal (thread
);
1523 /* Preparing to resume may try to write registers, and fail if the
1524 lwp is zombie. If that happens, ignore the error. We'll handle
1525 it below, when detach fails with ESRCH. */
1528 /* Flush any pending changes to the process's registers. */
1529 regcache_invalidate_thread (thread
);
1531 /* Finally, let it resume. */
1532 if (the_low_target
.prepare_to_resume
!= NULL
)
1533 the_low_target
.prepare_to_resume (lwp
);
1535 CATCH (ex
, RETURN_MASK_ERROR
)
1537 if (!check_ptrace_stopped_lwp_gone (lwp
))
1538 throw_exception (ex
);
1542 lwpid
= lwpid_of (thread
);
1543 if (ptrace (PTRACE_DETACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0,
1544 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1546 int save_errno
= errno
;
1548 /* We know the thread exists, so ESRCH must mean the lwp is
1549 zombie. This can happen if one of the already-detached
1550 threads exits the whole thread group. In that case we're
1551 still attached, and must reap the lwp. */
1552 if (save_errno
== ESRCH
)
1556 ret
= my_waitpid (lwpid
, &status
, __WALL
);
1559 warning (_("Couldn't reap LWP %d while detaching: %s"),
1560 lwpid
, strerror (errno
));
1562 else if (!WIFEXITED (status
) && !WIFSIGNALED (status
))
1564 warning (_("Reaping LWP %d while detaching "
1565 "returned unexpected status 0x%x"),
1571 error (_("Can't detach %s: %s"),
1572 target_pid_to_str (ptid_of (thread
)),
1573 strerror (save_errno
));
1576 else if (debug_threads
)
1578 debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n",
1579 target_pid_to_str (ptid_of (thread
)),
1586 /* Callback for find_inferior. Detaches from non-leader threads of a
1590 linux_detach_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1592 struct thread_info
*thread
= (struct thread_info
*) entry
;
1593 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1594 int pid
= *(int *) args
;
1595 int lwpid
= lwpid_of (thread
);
1597 /* Skip other processes. */
1598 if (ptid_get_pid (entry
->id
) != pid
)
1601 /* We don't actually detach from the thread group leader just yet.
1602 If the thread group exits, we must reap the zombie clone lwps
1603 before we're able to reap the leader. */
1604 if (ptid_get_pid (entry
->id
) == lwpid
)
1607 linux_detach_one_lwp (lwp
);
1612 linux_detach (int pid
)
1614 struct process_info
*process
;
1615 struct lwp_info
*main_lwp
;
1617 process
= find_process_pid (pid
);
1618 if (process
== NULL
)
1621 /* As there's a step over already in progress, let it finish first,
1622 otherwise nesting a stabilize_threads operation on top gets real
1624 complete_ongoing_step_over ();
1626 /* Stop all threads before detaching. First, ptrace requires that
1627 the thread is stopped to sucessfully detach. Second, thread_db
1628 may need to uninstall thread event breakpoints from memory, which
1629 only works with a stopped process anyway. */
1630 stop_all_lwps (0, NULL
);
1632 #ifdef USE_THREAD_DB
1633 thread_db_detach (process
);
1636 /* Stabilize threads (move out of jump pads). */
1637 stabilize_threads ();
1639 /* Detach from the clone lwps first. If the thread group exits just
1640 while we're detaching, we must reap the clone lwps before we're
1641 able to reap the leader. */
1642 find_inferior (&all_threads
, linux_detach_lwp_callback
, &pid
);
1644 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1645 linux_detach_one_lwp (main_lwp
);
1647 the_target
->mourn (process
);
1649 /* Since we presently can only stop all lwps of all processes, we
1650 need to unstop lwps of other processes. */
1651 unstop_all_lwps (0, NULL
);
1655 /* Remove all LWPs that belong to process PROC from the lwp list. */
1658 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1660 struct thread_info
*thread
= (struct thread_info
*) entry
;
1661 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1662 struct process_info
*process
= (struct process_info
*) proc
;
1664 if (pid_of (thread
) == pid_of (process
))
1671 linux_mourn (struct process_info
*process
)
1673 struct process_info_private
*priv
;
1675 #ifdef USE_THREAD_DB
1676 thread_db_mourn (process
);
1679 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1681 /* Freeing all private data. */
1682 priv
= process
->priv
;
1683 free (priv
->arch_private
);
1685 process
->priv
= NULL
;
1687 remove_process (process
);
1691 linux_join (int pid
)
1696 ret
= my_waitpid (pid
, &status
, 0);
1697 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1699 } while (ret
!= -1 || errno
!= ECHILD
);
1702 /* Return nonzero if the given thread is still alive. */
1704 linux_thread_alive (ptid_t ptid
)
1706 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1708 /* We assume we always know if a thread exits. If a whole process
1709 exited but we still haven't been able to report it to GDB, we'll
1710 hold on to the last lwp of the dead process. */
1712 return !lwp_is_marked_dead (lwp
);
1717 /* Return 1 if this lwp still has an interesting status pending. If
1718 not (e.g., it had stopped for a breakpoint that is gone), return
1722 thread_still_has_status_pending_p (struct thread_info
*thread
)
1724 struct lwp_info
*lp
= get_thread_lwp (thread
);
1726 if (!lp
->status_pending_p
)
1729 if (thread
->last_resume_kind
!= resume_stop
1730 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1731 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1733 struct thread_info
*saved_thread
;
1737 gdb_assert (lp
->last_status
!= 0);
1741 saved_thread
= current_thread
;
1742 current_thread
= thread
;
1744 if (pc
!= lp
->stop_pc
)
1747 debug_printf ("PC of %ld changed\n",
1752 #if !USE_SIGTRAP_SIGINFO
1753 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1754 && !(*the_low_target
.breakpoint_at
) (pc
))
1757 debug_printf ("previous SW breakpoint of %ld gone\n",
1761 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1762 && !hardware_breakpoint_inserted_here (pc
))
1765 debug_printf ("previous HW breakpoint of %ld gone\n",
1771 current_thread
= saved_thread
;
1776 debug_printf ("discarding pending breakpoint status\n");
1777 lp
->status_pending_p
= 0;
1785 /* Returns true if LWP is resumed from the client's perspective. */
1788 lwp_resumed (struct lwp_info
*lwp
)
1790 struct thread_info
*thread
= get_lwp_thread (lwp
);
1792 if (thread
->last_resume_kind
!= resume_stop
)
1795 /* Did gdb send us a `vCont;t', but we haven't reported the
1796 corresponding stop to gdb yet? If so, the thread is still
1797 resumed/running from gdb's perspective. */
1798 if (thread
->last_resume_kind
== resume_stop
1799 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1805 /* Return 1 if this lwp has an interesting status pending. */
1807 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1809 struct thread_info
*thread
= (struct thread_info
*) entry
;
1810 struct lwp_info
*lp
= get_thread_lwp (thread
);
1811 ptid_t ptid
= * (ptid_t
*) arg
;
1813 /* Check if we're only interested in events from a specific process
1814 or a specific LWP. */
1815 if (!ptid_match (ptid_of (thread
), ptid
))
1818 if (!lwp_resumed (lp
))
1821 if (lp
->status_pending_p
1822 && !thread_still_has_status_pending_p (thread
))
1824 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1828 return lp
->status_pending_p
;
1832 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1834 ptid_t ptid
= *(ptid_t
*) data
;
1837 if (ptid_get_lwp (ptid
) != 0)
1838 lwp
= ptid_get_lwp (ptid
);
1840 lwp
= ptid_get_pid (ptid
);
1842 if (ptid_get_lwp (entry
->id
) == lwp
)
1849 find_lwp_pid (ptid_t ptid
)
1851 struct inferior_list_entry
*thread
1852 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1857 return get_thread_lwp ((struct thread_info
*) thread
);
1860 /* Return the number of known LWPs in the tgid given by PID. */
1865 struct inferior_list_entry
*inf
, *tmp
;
1868 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1870 if (ptid_get_pid (inf
->id
) == pid
)
1877 /* The arguments passed to iterate_over_lwps. */
1879 struct iterate_over_lwps_args
1881 /* The FILTER argument passed to iterate_over_lwps. */
1884 /* The CALLBACK argument passed to iterate_over_lwps. */
1885 iterate_over_lwps_ftype
*callback
;
1887 /* The DATA argument passed to iterate_over_lwps. */
1891 /* Callback for find_inferior used by iterate_over_lwps to filter
1892 calls to the callback supplied to that function. Returning a
1893 nonzero value causes find_inferiors to stop iterating and return
1894 the current inferior_list_entry. Returning zero indicates that
1895 find_inferiors should continue iterating. */
1898 iterate_over_lwps_filter (struct inferior_list_entry
*entry
, void *args_p
)
1900 struct iterate_over_lwps_args
*args
1901 = (struct iterate_over_lwps_args
*) args_p
;
1903 if (ptid_match (entry
->id
, args
->filter
))
1905 struct thread_info
*thr
= (struct thread_info
*) entry
;
1906 struct lwp_info
*lwp
= get_thread_lwp (thr
);
1908 return (*args
->callback
) (lwp
, args
->data
);
1914 /* See nat/linux-nat.h. */
1917 iterate_over_lwps (ptid_t filter
,
1918 iterate_over_lwps_ftype callback
,
1921 struct iterate_over_lwps_args args
= {filter
, callback
, data
};
1922 struct inferior_list_entry
*entry
;
1924 entry
= find_inferior (&all_threads
, iterate_over_lwps_filter
, &args
);
1928 return get_thread_lwp ((struct thread_info
*) entry
);
1931 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1932 their exits until all other threads in the group have exited. */
1935 check_zombie_leaders (void)
1937 struct process_info
*proc
, *tmp
;
1939 ALL_PROCESSES (proc
, tmp
)
1941 pid_t leader_pid
= pid_of (proc
);
1942 struct lwp_info
*leader_lp
;
1944 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1947 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1948 "num_lwps=%d, zombie=%d\n",
1949 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1950 linux_proc_pid_is_zombie (leader_pid
));
1952 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1953 /* Check if there are other threads in the group, as we may
1954 have raced with the inferior simply exiting. */
1955 && !last_thread_of_process_p (leader_pid
)
1956 && linux_proc_pid_is_zombie (leader_pid
))
1958 /* A leader zombie can mean one of two things:
1960 - It exited, and there's an exit status pending
1961 available, or only the leader exited (not the whole
1962 program). In the latter case, we can't waitpid the
1963 leader's exit status until all other threads are gone.
1965 - There are 3 or more threads in the group, and a thread
1966 other than the leader exec'd. On an exec, the Linux
1967 kernel destroys all other threads (except the execing
1968 one) in the thread group, and resets the execing thread's
1969 tid to the tgid. No exit notification is sent for the
1970 execing thread -- from the ptracer's perspective, it
1971 appears as though the execing thread just vanishes.
1972 Until we reap all other threads except the leader and the
1973 execing thread, the leader will be zombie, and the
1974 execing thread will be in `D (disc sleep)'. As soon as
1975 all other threads are reaped, the execing thread changes
1976 it's tid to the tgid, and the previous (zombie) leader
1977 vanishes, giving place to the "new" leader. We could try
1978 distinguishing the exit and exec cases, by waiting once
1979 more, and seeing if something comes out, but it doesn't
1980 sound useful. The previous leader _does_ go away, and
1981 we'll re-add the new one once we see the exec event
1982 (which is just the same as what would happen if the
1983 previous leader did exit voluntarily before some other
1987 debug_printf ("CZL: Thread group leader %d zombie "
1988 "(it exited, or another thread execd).\n",
1991 delete_lwp (leader_lp
);
1996 /* Callback for `find_inferior'. Returns the first LWP that is not
1997 stopped. ARG is a PTID filter. */
2000 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
2002 struct thread_info
*thr
= (struct thread_info
*) entry
;
2003 struct lwp_info
*lwp
;
2004 ptid_t filter
= *(ptid_t
*) arg
;
2006 if (!ptid_match (ptid_of (thr
), filter
))
2009 lwp
= get_thread_lwp (thr
);
2016 /* Increment LWP's suspend count. */
2019 lwp_suspended_inc (struct lwp_info
*lwp
)
2023 if (debug_threads
&& lwp
->suspended
> 4)
2025 struct thread_info
*thread
= get_lwp_thread (lwp
);
2027 debug_printf ("LWP %ld has a suspiciously high suspend count,"
2028 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
2032 /* Decrement LWP's suspend count. */
2035 lwp_suspended_decr (struct lwp_info
*lwp
)
2039 if (lwp
->suspended
< 0)
2041 struct thread_info
*thread
= get_lwp_thread (lwp
);
2043 internal_error (__FILE__
, __LINE__
,
2044 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
2049 /* This function should only be called if the LWP got a SIGTRAP.
2051 Handle any tracepoint steps or hits. Return true if a tracepoint
2052 event was handled, 0 otherwise. */
2055 handle_tracepoints (struct lwp_info
*lwp
)
2057 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
2058 int tpoint_related_event
= 0;
2060 gdb_assert (lwp
->suspended
== 0);
2062 /* If this tracepoint hit causes a tracing stop, we'll immediately
2063 uninsert tracepoints. To do this, we temporarily pause all
2064 threads, unpatch away, and then unpause threads. We need to make
2065 sure the unpausing doesn't resume LWP too. */
2066 lwp_suspended_inc (lwp
);
2068 /* And we need to be sure that any all-threads-stopping doesn't try
2069 to move threads out of the jump pads, as it could deadlock the
2070 inferior (LWP could be in the jump pad, maybe even holding the
2073 /* Do any necessary step collect actions. */
2074 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2076 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2078 /* See if we just hit a tracepoint and do its main collect
2080 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2082 lwp_suspended_decr (lwp
);
2084 gdb_assert (lwp
->suspended
== 0);
2085 gdb_assert (!stabilizing_threads
2086 || (lwp
->collecting_fast_tracepoint
2087 != fast_tpoint_collect_result::not_collecting
));
2089 if (tpoint_related_event
)
2092 debug_printf ("got a tracepoint event\n");
2099 /* Convenience wrapper. Returns information about LWP's fast tracepoint
2100 collection status. */
2102 static fast_tpoint_collect_result
2103 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2104 struct fast_tpoint_collect_status
*status
)
2106 CORE_ADDR thread_area
;
2107 struct thread_info
*thread
= get_lwp_thread (lwp
);
2109 if (the_low_target
.get_thread_area
== NULL
)
2110 return fast_tpoint_collect_result::not_collecting
;
2112 /* Get the thread area address. This is used to recognize which
2113 thread is which when tracing with the in-process agent library.
2114 We don't read anything from the address, and treat it as opaque;
2115 it's the address itself that we assume is unique per-thread. */
2116 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2117 return fast_tpoint_collect_result::not_collecting
;
2119 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2122 /* The reason we resume in the caller, is because we want to be able
2123 to pass lwp->status_pending as WSTAT, and we need to clear
2124 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2125 refuses to resume. */
2128 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2130 struct thread_info
*saved_thread
;
2132 saved_thread
= current_thread
;
2133 current_thread
= get_lwp_thread (lwp
);
2136 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2137 && supports_fast_tracepoints ()
2138 && agent_loaded_p ())
2140 struct fast_tpoint_collect_status status
;
2143 debug_printf ("Checking whether LWP %ld needs to move out of the "
2145 lwpid_of (current_thread
));
2147 fast_tpoint_collect_result r
2148 = linux_fast_tracepoint_collecting (lwp
, &status
);
2151 || (WSTOPSIG (*wstat
) != SIGILL
2152 && WSTOPSIG (*wstat
) != SIGFPE
2153 && WSTOPSIG (*wstat
) != SIGSEGV
2154 && WSTOPSIG (*wstat
) != SIGBUS
))
2156 lwp
->collecting_fast_tracepoint
= r
;
2158 if (r
!= fast_tpoint_collect_result::not_collecting
)
2160 if (r
== fast_tpoint_collect_result::before_insn
2161 && lwp
->exit_jump_pad_bkpt
== NULL
)
2163 /* Haven't executed the original instruction yet.
2164 Set breakpoint there, and wait till it's hit,
2165 then single-step until exiting the jump pad. */
2166 lwp
->exit_jump_pad_bkpt
2167 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2171 debug_printf ("Checking whether LWP %ld needs to move out of "
2172 "the jump pad...it does\n",
2173 lwpid_of (current_thread
));
2174 current_thread
= saved_thread
;
2181 /* If we get a synchronous signal while collecting, *and*
2182 while executing the (relocated) original instruction,
2183 reset the PC to point at the tpoint address, before
2184 reporting to GDB. Otherwise, it's an IPA lib bug: just
2185 report the signal to GDB, and pray for the best. */
2187 lwp
->collecting_fast_tracepoint
2188 = fast_tpoint_collect_result::not_collecting
;
2190 if (r
!= fast_tpoint_collect_result::not_collecting
2191 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2192 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2195 struct regcache
*regcache
;
2197 /* The si_addr on a few signals references the address
2198 of the faulting instruction. Adjust that as
2200 if ((WSTOPSIG (*wstat
) == SIGILL
2201 || WSTOPSIG (*wstat
) == SIGFPE
2202 || WSTOPSIG (*wstat
) == SIGBUS
2203 || WSTOPSIG (*wstat
) == SIGSEGV
)
2204 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2205 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2206 /* Final check just to make sure we don't clobber
2207 the siginfo of non-kernel-sent signals. */
2208 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2210 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2211 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2212 (PTRACE_TYPE_ARG3
) 0, &info
);
2215 regcache
= get_thread_regcache (current_thread
, 1);
2216 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2217 lwp
->stop_pc
= status
.tpoint_addr
;
2219 /* Cancel any fast tracepoint lock this thread was
2221 force_unlock_trace_buffer ();
2224 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2227 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2228 "stopping all threads momentarily.\n");
2230 stop_all_lwps (1, lwp
);
2232 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2233 lwp
->exit_jump_pad_bkpt
= NULL
;
2235 unstop_all_lwps (1, lwp
);
2237 gdb_assert (lwp
->suspended
>= 0);
2243 debug_printf ("Checking whether LWP %ld needs to move out of the "
2245 lwpid_of (current_thread
));
2247 current_thread
= saved_thread
;
2251 /* Enqueue one signal in the "signals to report later when out of the
2255 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2257 struct pending_signals
*p_sig
;
2258 struct thread_info
*thread
= get_lwp_thread (lwp
);
2261 debug_printf ("Deferring signal %d for LWP %ld.\n",
2262 WSTOPSIG (*wstat
), lwpid_of (thread
));
2266 struct pending_signals
*sig
;
2268 for (sig
= lwp
->pending_signals_to_report
;
2271 debug_printf (" Already queued %d\n",
2274 debug_printf (" (no more currently queued signals)\n");
2277 /* Don't enqueue non-RT signals if they are already in the deferred
2278 queue. (SIGSTOP being the easiest signal to see ending up here
2280 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2282 struct pending_signals
*sig
;
2284 for (sig
= lwp
->pending_signals_to_report
;
2288 if (sig
->signal
== WSTOPSIG (*wstat
))
2291 debug_printf ("Not requeuing already queued non-RT signal %d"
2300 p_sig
= XCNEW (struct pending_signals
);
2301 p_sig
->prev
= lwp
->pending_signals_to_report
;
2302 p_sig
->signal
= WSTOPSIG (*wstat
);
2304 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2307 lwp
->pending_signals_to_report
= p_sig
;
2310 /* Dequeue one signal from the "signals to report later when out of
2311 the jump pad" list. */
2314 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2316 struct thread_info
*thread
= get_lwp_thread (lwp
);
2318 if (lwp
->pending_signals_to_report
!= NULL
)
2320 struct pending_signals
**p_sig
;
2322 p_sig
= &lwp
->pending_signals_to_report
;
2323 while ((*p_sig
)->prev
!= NULL
)
2324 p_sig
= &(*p_sig
)->prev
;
2326 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2327 if ((*p_sig
)->info
.si_signo
!= 0)
2328 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2334 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2335 WSTOPSIG (*wstat
), lwpid_of (thread
));
2339 struct pending_signals
*sig
;
2341 for (sig
= lwp
->pending_signals_to_report
;
2344 debug_printf (" Still queued %d\n",
2347 debug_printf (" (no more queued signals)\n");
2356 /* Fetch the possibly triggered data watchpoint info and store it in
2359 On some archs, like x86, that use debug registers to set
2360 watchpoints, it's possible that the way to know which watched
2361 address trapped, is to check the register that is used to select
2362 which address to watch. Problem is, between setting the watchpoint
2363 and reading back which data address trapped, the user may change
2364 the set of watchpoints, and, as a consequence, GDB changes the
2365 debug registers in the inferior. To avoid reading back a stale
2366 stopped-data-address when that happens, we cache in LP the fact
2367 that a watchpoint trapped, and the corresponding data address, as
2368 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2369 registers meanwhile, we have the cached data we can rely on. */
2372 check_stopped_by_watchpoint (struct lwp_info
*child
)
2374 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2376 struct thread_info
*saved_thread
;
2378 saved_thread
= current_thread
;
2379 current_thread
= get_lwp_thread (child
);
2381 if (the_low_target
.stopped_by_watchpoint ())
2383 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2385 if (the_low_target
.stopped_data_address
!= NULL
)
2386 child
->stopped_data_address
2387 = the_low_target
.stopped_data_address ();
2389 child
->stopped_data_address
= 0;
2392 current_thread
= saved_thread
;
2395 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2398 /* Return the ptrace options that we want to try to enable. */
2401 linux_low_ptrace_options (int attached
)
2406 options
|= PTRACE_O_EXITKILL
;
2408 if (report_fork_events
)
2409 options
|= PTRACE_O_TRACEFORK
;
2411 if (report_vfork_events
)
2412 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2414 if (report_exec_events
)
2415 options
|= PTRACE_O_TRACEEXEC
;
2417 options
|= PTRACE_O_TRACESYSGOOD
;
2422 /* Do low-level handling of the event, and check if we should go on
2423 and pass it to caller code. Return the affected lwp if we are, or
2426 static struct lwp_info
*
2427 linux_low_filter_event (int lwpid
, int wstat
)
2429 struct lwp_info
*child
;
2430 struct thread_info
*thread
;
2431 int have_stop_pc
= 0;
2433 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2435 /* Check for stop events reported by a process we didn't already
2436 know about - anything not already in our LWP list.
2438 If we're expecting to receive stopped processes after
2439 fork, vfork, and clone events, then we'll just add the
2440 new one to our list and go back to waiting for the event
2441 to be reported - the stopped process might be returned
2442 from waitpid before or after the event is.
2444 But note the case of a non-leader thread exec'ing after the
2445 leader having exited, and gone from our lists (because
2446 check_zombie_leaders deleted it). The non-leader thread
2447 changes its tid to the tgid. */
2449 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2450 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2454 /* A multi-thread exec after we had seen the leader exiting. */
2457 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2458 "after exec.\n", lwpid
);
2461 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2462 child
= add_lwp (child_ptid
);
2464 current_thread
= child
->thread
;
2467 /* If we didn't find a process, one of two things presumably happened:
2468 - A process we started and then detached from has exited. Ignore it.
2469 - A process we are controlling has forked and the new child's stop
2470 was reported to us by the kernel. Save its PID. */
2471 if (child
== NULL
&& WIFSTOPPED (wstat
))
2473 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2476 else if (child
== NULL
)
2479 thread
= get_lwp_thread (child
);
2483 child
->last_status
= wstat
;
2485 /* Check if the thread has exited. */
2486 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2489 debug_printf ("LLFE: %d exited.\n", lwpid
);
2491 if (finish_step_over (child
))
2493 /* Unsuspend all other LWPs, and set them back running again. */
2494 unsuspend_all_lwps (child
);
2497 /* If there is at least one more LWP, then the exit signal was
2498 not the end of the debugged application and should be
2499 ignored, unless GDB wants to hear about thread exits. */
2500 if (report_thread_events
2501 || last_thread_of_process_p (pid_of (thread
)))
2503 /* Since events are serialized to GDB core, and we can't
2504 report this one right now. Leave the status pending for
2505 the next time we're able to report it. */
2506 mark_lwp_dead (child
, wstat
);
2516 gdb_assert (WIFSTOPPED (wstat
));
2518 if (WIFSTOPPED (wstat
))
2520 struct process_info
*proc
;
2522 /* Architecture-specific setup after inferior is running. */
2523 proc
= find_process_pid (pid_of (thread
));
2524 if (proc
->tdesc
== NULL
)
2528 /* This needs to happen after we have attached to the
2529 inferior and it is stopped for the first time, but
2530 before we access any inferior registers. */
2531 linux_arch_setup_thread (thread
);
2535 /* The process is started, but GDBserver will do
2536 architecture-specific setup after the program stops at
2537 the first instruction. */
2538 child
->status_pending_p
= 1;
2539 child
->status_pending
= wstat
;
2545 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2547 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2548 int options
= linux_low_ptrace_options (proc
->attached
);
2550 linux_enable_event_reporting (lwpid
, options
);
2551 child
->must_set_ptrace_flags
= 0;
2554 /* Always update syscall_state, even if it will be filtered later. */
2555 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2557 child
->syscall_state
2558 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2559 ? TARGET_WAITKIND_SYSCALL_RETURN
2560 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2564 /* Almost all other ptrace-stops are known to be outside of system
2565 calls, with further exceptions in handle_extended_wait. */
2566 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2569 /* Be careful to not overwrite stop_pc until save_stop_reason is
2571 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2572 && linux_is_extended_waitstatus (wstat
))
2574 child
->stop_pc
= get_pc (child
);
2575 if (handle_extended_wait (&child
, wstat
))
2577 /* The event has been handled, so just return without
2583 if (linux_wstatus_maybe_breakpoint (wstat
))
2585 if (save_stop_reason (child
))
2590 child
->stop_pc
= get_pc (child
);
2592 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2593 && child
->stop_expected
)
2596 debug_printf ("Expected stop.\n");
2597 child
->stop_expected
= 0;
2599 if (thread
->last_resume_kind
== resume_stop
)
2601 /* We want to report the stop to the core. Treat the
2602 SIGSTOP as a normal event. */
2604 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2605 target_pid_to_str (ptid_of (thread
)));
2607 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2609 /* Stopping threads. We don't want this SIGSTOP to end up
2612 debug_printf ("LLW: SIGSTOP caught for %s "
2613 "while stopping threads.\n",
2614 target_pid_to_str (ptid_of (thread
)));
2619 /* This is a delayed SIGSTOP. Filter out the event. */
2621 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2622 child
->stepping
? "step" : "continue",
2623 target_pid_to_str (ptid_of (thread
)));
2625 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2630 child
->status_pending_p
= 1;
2631 child
->status_pending
= wstat
;
2635 /* Return true if THREAD is doing hardware single step. */
2638 maybe_hw_step (struct thread_info
*thread
)
2640 if (can_hardware_single_step ())
2644 /* GDBserver must insert single-step breakpoint for software
2646 gdb_assert (has_single_step_breakpoints (thread
));
2651 /* Resume LWPs that are currently stopped without any pending status
2652 to report, but are resumed from the core's perspective. */
2655 resume_stopped_resumed_lwps (struct inferior_list_entry
*entry
)
2657 struct thread_info
*thread
= (struct thread_info
*) entry
;
2658 struct lwp_info
*lp
= get_thread_lwp (thread
);
2662 && !lp
->status_pending_p
2663 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2667 if (thread
->last_resume_kind
== resume_step
)
2668 step
= maybe_hw_step (thread
);
2671 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2672 target_pid_to_str (ptid_of (thread
)),
2673 paddress (lp
->stop_pc
),
2676 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2680 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2681 match FILTER_PTID (leaving others pending). The PTIDs can be:
2682 minus_one_ptid, to specify any child; a pid PTID, specifying all
2683 lwps of a thread group; or a PTID representing a single lwp. Store
2684 the stop status through the status pointer WSTAT. OPTIONS is
2685 passed to the waitpid call. Return 0 if no event was found and
2686 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2687 was found. Return the PID of the stopped child otherwise. */
2690 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2691 int *wstatp
, int options
)
2693 struct thread_info
*event_thread
;
2694 struct lwp_info
*event_child
, *requested_child
;
2695 sigset_t block_mask
, prev_mask
;
2698 /* N.B. event_thread points to the thread_info struct that contains
2699 event_child. Keep them in sync. */
2700 event_thread
= NULL
;
2702 requested_child
= NULL
;
2704 /* Check for a lwp with a pending status. */
2706 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2708 event_thread
= (struct thread_info
*)
2709 find_inferior_in_random (&all_threads
, status_pending_p_callback
,
2711 if (event_thread
!= NULL
)
2712 event_child
= get_thread_lwp (event_thread
);
2713 if (debug_threads
&& event_thread
)
2714 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2716 else if (!ptid_equal (filter_ptid
, null_ptid
))
2718 requested_child
= find_lwp_pid (filter_ptid
);
2720 if (stopping_threads
== NOT_STOPPING_THREADS
2721 && requested_child
->status_pending_p
2722 && (requested_child
->collecting_fast_tracepoint
2723 != fast_tpoint_collect_result::not_collecting
))
2725 enqueue_one_deferred_signal (requested_child
,
2726 &requested_child
->status_pending
);
2727 requested_child
->status_pending_p
= 0;
2728 requested_child
->status_pending
= 0;
2729 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2732 if (requested_child
->suspended
2733 && requested_child
->status_pending_p
)
2735 internal_error (__FILE__
, __LINE__
,
2736 "requesting an event out of a"
2737 " suspended child?");
2740 if (requested_child
->status_pending_p
)
2742 event_child
= requested_child
;
2743 event_thread
= get_lwp_thread (event_child
);
2747 if (event_child
!= NULL
)
2750 debug_printf ("Got an event from pending child %ld (%04x)\n",
2751 lwpid_of (event_thread
), event_child
->status_pending
);
2752 *wstatp
= event_child
->status_pending
;
2753 event_child
->status_pending_p
= 0;
2754 event_child
->status_pending
= 0;
2755 current_thread
= event_thread
;
2756 return lwpid_of (event_thread
);
2759 /* But if we don't find a pending event, we'll have to wait.
2761 We only enter this loop if no process has a pending wait status.
2762 Thus any action taken in response to a wait status inside this
2763 loop is responding as soon as we detect the status, not after any
2766 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2767 all signals while here. */
2768 sigfillset (&block_mask
);
2769 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2771 /* Always pull all events out of the kernel. We'll randomly select
2772 an event LWP out of all that have events, to prevent
2774 while (event_child
== NULL
)
2778 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2781 - If the thread group leader exits while other threads in the
2782 thread group still exist, waitpid(TGID, ...) hangs. That
2783 waitpid won't return an exit status until the other threads
2784 in the group are reaped.
2786 - When a non-leader thread execs, that thread just vanishes
2787 without reporting an exit (so we'd hang if we waited for it
2788 explicitly in that case). The exec event is reported to
2791 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2794 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2795 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2801 debug_printf ("LLW: waitpid %ld received %s\n",
2802 (long) ret
, status_to_str (*wstatp
));
2805 /* Filter all events. IOW, leave all events pending. We'll
2806 randomly select an event LWP out of all that have events
2808 linux_low_filter_event (ret
, *wstatp
);
2809 /* Retry until nothing comes out of waitpid. A single
2810 SIGCHLD can indicate more than one child stopped. */
2814 /* Now that we've pulled all events out of the kernel, resume
2815 LWPs that don't have an interesting event to report. */
2816 if (stopping_threads
== NOT_STOPPING_THREADS
)
2817 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2819 /* ... and find an LWP with a status to report to the core, if
2821 event_thread
= (struct thread_info
*)
2822 find_inferior_in_random (&all_threads
, status_pending_p_callback
,
2824 if (event_thread
!= NULL
)
2826 event_child
= get_thread_lwp (event_thread
);
2827 *wstatp
= event_child
->status_pending
;
2828 event_child
->status_pending_p
= 0;
2829 event_child
->status_pending
= 0;
2833 /* Check for zombie thread group leaders. Those can't be reaped
2834 until all other threads in the thread group are. */
2835 check_zombie_leaders ();
2837 /* If there are no resumed children left in the set of LWPs we
2838 want to wait for, bail. We can't just block in
2839 waitpid/sigsuspend, because lwps might have been left stopped
2840 in trace-stop state, and we'd be stuck forever waiting for
2841 their status to change (which would only happen if we resumed
2842 them). Even if WNOHANG is set, this return code is preferred
2843 over 0 (below), as it is more detailed. */
2844 if ((find_inferior (&all_threads
,
2845 not_stopped_callback
,
2846 &wait_ptid
) == NULL
))
2849 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2850 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2854 /* No interesting event to report to the caller. */
2855 if ((options
& WNOHANG
))
2858 debug_printf ("WNOHANG set, no event found\n");
2860 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2864 /* Block until we get an event reported with SIGCHLD. */
2866 debug_printf ("sigsuspend'ing\n");
2868 sigsuspend (&prev_mask
);
2869 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2873 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2875 current_thread
= event_thread
;
2877 return lwpid_of (event_thread
);
2880 /* Wait for an event from child(ren) PTID. PTIDs can be:
2881 minus_one_ptid, to specify any child; a pid PTID, specifying all
2882 lwps of a thread group; or a PTID representing a single lwp. Store
2883 the stop status through the status pointer WSTAT. OPTIONS is
2884 passed to the waitpid call. Return 0 if no event was found and
2885 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2886 was found. Return the PID of the stopped child otherwise. */
2889 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2891 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2894 /* Count the LWP's that have had events. */
2897 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2899 struct thread_info
*thread
= (struct thread_info
*) entry
;
2900 struct lwp_info
*lp
= get_thread_lwp (thread
);
2901 int *count
= (int *) data
;
2903 gdb_assert (count
!= NULL
);
2905 /* Count only resumed LWPs that have an event pending. */
2906 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2907 && lp
->status_pending_p
)
2913 /* Select the LWP (if any) that is currently being single-stepped. */
2916 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2918 struct thread_info
*thread
= (struct thread_info
*) entry
;
2919 struct lwp_info
*lp
= get_thread_lwp (thread
);
2921 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2922 && thread
->last_resume_kind
== resume_step
2923 && lp
->status_pending_p
)
2929 /* Select the Nth LWP that has had an event. */
2932 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2934 struct thread_info
*thread
= (struct thread_info
*) entry
;
2935 struct lwp_info
*lp
= get_thread_lwp (thread
);
2936 int *selector
= (int *) data
;
2938 gdb_assert (selector
!= NULL
);
2940 /* Select only resumed LWPs that have an event pending. */
2941 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2942 && lp
->status_pending_p
)
2943 if ((*selector
)-- == 0)
2949 /* Select one LWP out of those that have events pending. */
2952 select_event_lwp (struct lwp_info
**orig_lp
)
2955 int random_selector
;
2956 struct thread_info
*event_thread
= NULL
;
2958 /* In all-stop, give preference to the LWP that is being
2959 single-stepped. There will be at most one, and it's the LWP that
2960 the core is most interested in. If we didn't do this, then we'd
2961 have to handle pending step SIGTRAPs somehow in case the core
2962 later continues the previously-stepped thread, otherwise we'd
2963 report the pending SIGTRAP, and the core, not having stepped the
2964 thread, wouldn't understand what the trap was for, and therefore
2965 would report it to the user as a random signal. */
2969 = (struct thread_info
*) find_inferior (&all_threads
,
2970 select_singlestep_lwp_callback
,
2972 if (event_thread
!= NULL
)
2975 debug_printf ("SEL: Select single-step %s\n",
2976 target_pid_to_str (ptid_of (event_thread
)));
2979 if (event_thread
== NULL
)
2981 /* No single-stepping LWP. Select one at random, out of those
2982 which have had events. */
2984 /* First see how many events we have. */
2985 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2986 gdb_assert (num_events
> 0);
2988 /* Now randomly pick a LWP out of those that have had
2990 random_selector
= (int)
2991 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2993 if (debug_threads
&& num_events
> 1)
2994 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2995 num_events
, random_selector
);
2998 = (struct thread_info
*) find_inferior (&all_threads
,
2999 select_event_lwp_callback
,
3003 if (event_thread
!= NULL
)
3005 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
3007 /* Switch the event LWP. */
3008 *orig_lp
= event_lp
;
3012 /* Decrement the suspend count of an LWP. */
3015 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
3017 struct thread_info
*thread
= (struct thread_info
*) entry
;
3018 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3020 /* Ignore EXCEPT. */
3024 lwp_suspended_decr (lwp
);
3028 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
3032 unsuspend_all_lwps (struct lwp_info
*except
)
3034 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
3037 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
3038 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
3040 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
3041 static ptid_t
linux_wait_1 (ptid_t ptid
,
3042 struct target_waitstatus
*ourstatus
,
3043 int target_options
);
3045 /* Stabilize threads (move out of jump pads).
3047 If a thread is midway collecting a fast tracepoint, we need to
3048 finish the collection and move it out of the jump pad before
3049 reporting the signal.
3051 This avoids recursion while collecting (when a signal arrives
3052 midway, and the signal handler itself collects), which would trash
3053 the trace buffer. In case the user set a breakpoint in a signal
3054 handler, this avoids the backtrace showing the jump pad, etc..
3055 Most importantly, there are certain things we can't do safely if
3056 threads are stopped in a jump pad (or in its callee's). For
3059 - starting a new trace run. A thread still collecting the
3060 previous run, could trash the trace buffer when resumed. The trace
3061 buffer control structures would have been reset but the thread had
3062 no way to tell. The thread could even midway memcpy'ing to the
3063 buffer, which would mean that when resumed, it would clobber the
3064 trace buffer that had been set for a new run.
3066 - we can't rewrite/reuse the jump pads for new tracepoints
3067 safely. Say you do tstart while a thread is stopped midway while
3068 collecting. When the thread is later resumed, it finishes the
3069 collection, and returns to the jump pad, to execute the original
3070 instruction that was under the tracepoint jump at the time the
3071 older run had been started. If the jump pad had been rewritten
3072 since for something else in the new run, the thread would now
3073 execute the wrong / random instructions. */
3076 linux_stabilize_threads (void)
3078 struct thread_info
*saved_thread
;
3079 struct thread_info
*thread_stuck
;
3082 = (struct thread_info
*) find_inferior (&all_threads
,
3083 stuck_in_jump_pad_callback
,
3085 if (thread_stuck
!= NULL
)
3088 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
3089 lwpid_of (thread_stuck
));
3093 saved_thread
= current_thread
;
3095 stabilizing_threads
= 1;
3098 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
3100 /* Loop until all are stopped out of the jump pads. */
3101 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
3103 struct target_waitstatus ourstatus
;
3104 struct lwp_info
*lwp
;
3107 /* Note that we go through the full wait even loop. While
3108 moving threads out of jump pad, we need to be able to step
3109 over internal breakpoints and such. */
3110 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
3112 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
3114 lwp
= get_thread_lwp (current_thread
);
3117 lwp_suspended_inc (lwp
);
3119 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3120 || current_thread
->last_resume_kind
== resume_stop
)
3122 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3123 enqueue_one_deferred_signal (lwp
, &wstat
);
3128 unsuspend_all_lwps (NULL
);
3130 stabilizing_threads
= 0;
3132 current_thread
= saved_thread
;
3137 = (struct thread_info
*) find_inferior (&all_threads
,
3138 stuck_in_jump_pad_callback
,
3140 if (thread_stuck
!= NULL
)
3141 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3142 lwpid_of (thread_stuck
));
3146 /* Convenience function that is called when the kernel reports an
3147 event that is not passed out to GDB. */
3150 ignore_event (struct target_waitstatus
*ourstatus
)
3152 /* If we got an event, there may still be others, as a single
3153 SIGCHLD can indicate more than one child stopped. This forces
3154 another target_wait call. */
3157 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3161 /* Convenience function that is called when the kernel reports an exit
3162 event. This decides whether to report the event to GDB as a
3163 process exit event, a thread exit event, or to suppress the
3167 filter_exit_event (struct lwp_info
*event_child
,
3168 struct target_waitstatus
*ourstatus
)
3170 struct thread_info
*thread
= get_lwp_thread (event_child
);
3171 ptid_t ptid
= ptid_of (thread
);
3173 if (!last_thread_of_process_p (pid_of (thread
)))
3175 if (report_thread_events
)
3176 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3178 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3180 delete_lwp (event_child
);
3185 /* Returns 1 if GDB is interested in any event_child syscalls. */
3188 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3190 struct thread_info
*thread
= get_lwp_thread (event_child
);
3191 struct process_info
*proc
= get_thread_process (thread
);
3193 return !VEC_empty (int, proc
->syscalls_to_catch
);
3196 /* Returns 1 if GDB is interested in the event_child syscall.
3197 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3200 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3204 struct thread_info
*thread
= get_lwp_thread (event_child
);
3205 struct process_info
*proc
= get_thread_process (thread
);
3207 if (VEC_empty (int, proc
->syscalls_to_catch
))
3210 if (VEC_index (int, proc
->syscalls_to_catch
, 0) == ANY_SYSCALL
)
3213 get_syscall_trapinfo (event_child
, &sysno
);
3215 VEC_iterate (int, proc
->syscalls_to_catch
, i
, iter
);
3223 /* Wait for process, returns status. */
3226 linux_wait_1 (ptid_t ptid
,
3227 struct target_waitstatus
*ourstatus
, int target_options
)
3230 struct lwp_info
*event_child
;
3233 int step_over_finished
;
3234 int bp_explains_trap
;
3235 int maybe_internal_trap
;
3244 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3247 /* Translate generic target options into linux options. */
3249 if (target_options
& TARGET_WNOHANG
)
3252 bp_explains_trap
= 0;
3255 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3257 /* Find a resumed LWP, if any. */
3258 if (find_inferior (&all_threads
,
3259 status_pending_p_callback
,
3260 &minus_one_ptid
) != NULL
)
3262 else if ((find_inferior (&all_threads
,
3263 not_stopped_callback
,
3264 &minus_one_ptid
) != NULL
))
3269 if (ptid_equal (step_over_bkpt
, null_ptid
))
3270 pid
= linux_wait_for_event (ptid
, &w
, options
);
3274 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3275 target_pid_to_str (step_over_bkpt
));
3276 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3279 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3281 gdb_assert (target_options
& TARGET_WNOHANG
);
3285 debug_printf ("linux_wait_1 ret = null_ptid, "
3286 "TARGET_WAITKIND_IGNORE\n");
3290 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3297 debug_printf ("linux_wait_1 ret = null_ptid, "
3298 "TARGET_WAITKIND_NO_RESUMED\n");
3302 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3306 event_child
= get_thread_lwp (current_thread
);
3308 /* linux_wait_for_event only returns an exit status for the last
3309 child of a process. Report it. */
3310 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3314 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3315 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3319 debug_printf ("linux_wait_1 ret = %s, exited with "
3321 target_pid_to_str (ptid_of (current_thread
)),
3328 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3329 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3333 debug_printf ("linux_wait_1 ret = %s, terminated with "
3335 target_pid_to_str (ptid_of (current_thread
)),
3341 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3342 return filter_exit_event (event_child
, ourstatus
);
3344 return ptid_of (current_thread
);
3347 /* If step-over executes a breakpoint instruction, in the case of a
3348 hardware single step it means a gdb/gdbserver breakpoint had been
3349 planted on top of a permanent breakpoint, in the case of a software
3350 single step it may just mean that gdbserver hit the reinsert breakpoint.
3351 The PC has been adjusted by save_stop_reason to point at
3352 the breakpoint address.
3353 So in the case of the hardware single step advance the PC manually
3354 past the breakpoint and in the case of software single step advance only
3355 if it's not the single_step_breakpoint we are hitting.
3356 This avoids that a program would keep trapping a permanent breakpoint
3358 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3359 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3360 && (event_child
->stepping
3361 || !single_step_breakpoint_inserted_here (event_child
->stop_pc
)))
3363 int increment_pc
= 0;
3364 int breakpoint_kind
= 0;
3365 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3368 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3369 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3373 debug_printf ("step-over for %s executed software breakpoint\n",
3374 target_pid_to_str (ptid_of (current_thread
)));
3377 if (increment_pc
!= 0)
3379 struct regcache
*regcache
3380 = get_thread_regcache (current_thread
, 1);
3382 event_child
->stop_pc
+= increment_pc
;
3383 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3385 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3386 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3390 /* If this event was not handled before, and is not a SIGTRAP, we
3391 report it. SIGILL and SIGSEGV are also treated as traps in case
3392 a breakpoint is inserted at the current PC. If this target does
3393 not support internal breakpoints at all, we also report the
3394 SIGTRAP without further processing; it's of no concern to us. */
3396 = (supports_breakpoints ()
3397 && (WSTOPSIG (w
) == SIGTRAP
3398 || ((WSTOPSIG (w
) == SIGILL
3399 || WSTOPSIG (w
) == SIGSEGV
)
3400 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3402 if (maybe_internal_trap
)
3404 /* Handle anything that requires bookkeeping before deciding to
3405 report the event or continue waiting. */
3407 /* First check if we can explain the SIGTRAP with an internal
3408 breakpoint, or if we should possibly report the event to GDB.
3409 Do this before anything that may remove or insert a
3411 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3413 /* We have a SIGTRAP, possibly a step-over dance has just
3414 finished. If so, tweak the state machine accordingly,
3415 reinsert breakpoints and delete any single-step
3417 step_over_finished
= finish_step_over (event_child
);
3419 /* Now invoke the callbacks of any internal breakpoints there. */
3420 check_breakpoints (event_child
->stop_pc
);
3422 /* Handle tracepoint data collecting. This may overflow the
3423 trace buffer, and cause a tracing stop, removing
3425 trace_event
= handle_tracepoints (event_child
);
3427 if (bp_explains_trap
)
3430 debug_printf ("Hit a gdbserver breakpoint.\n");
3435 /* We have some other signal, possibly a step-over dance was in
3436 progress, and it should be cancelled too. */
3437 step_over_finished
= finish_step_over (event_child
);
3440 /* We have all the data we need. Either report the event to GDB, or
3441 resume threads and keep waiting for more. */
3443 /* If we're collecting a fast tracepoint, finish the collection and
3444 move out of the jump pad before delivering a signal. See
3445 linux_stabilize_threads. */
3448 && WSTOPSIG (w
) != SIGTRAP
3449 && supports_fast_tracepoints ()
3450 && agent_loaded_p ())
3453 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3454 "to defer or adjust it.\n",
3455 WSTOPSIG (w
), lwpid_of (current_thread
));
3457 /* Allow debugging the jump pad itself. */
3458 if (current_thread
->last_resume_kind
!= resume_step
3459 && maybe_move_out_of_jump_pad (event_child
, &w
))
3461 enqueue_one_deferred_signal (event_child
, &w
);
3464 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3465 WSTOPSIG (w
), lwpid_of (current_thread
));
3467 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3471 return ignore_event (ourstatus
);
3475 if (event_child
->collecting_fast_tracepoint
3476 != fast_tpoint_collect_result::not_collecting
)
3479 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3480 "Check if we're already there.\n",
3481 lwpid_of (current_thread
),
3482 (int) event_child
->collecting_fast_tracepoint
);
3486 event_child
->collecting_fast_tracepoint
3487 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3489 if (event_child
->collecting_fast_tracepoint
3490 != fast_tpoint_collect_result::before_insn
)
3492 /* No longer need this breakpoint. */
3493 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3496 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3497 "stopping all threads momentarily.\n");
3499 /* Other running threads could hit this breakpoint.
3500 We don't handle moribund locations like GDB does,
3501 instead we always pause all threads when removing
3502 breakpoints, so that any step-over or
3503 decr_pc_after_break adjustment is always taken
3504 care of while the breakpoint is still
3506 stop_all_lwps (1, event_child
);
3508 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3509 event_child
->exit_jump_pad_bkpt
= NULL
;
3511 unstop_all_lwps (1, event_child
);
3513 gdb_assert (event_child
->suspended
>= 0);
3517 if (event_child
->collecting_fast_tracepoint
3518 == fast_tpoint_collect_result::not_collecting
)
3521 debug_printf ("fast tracepoint finished "
3522 "collecting successfully.\n");
3524 /* We may have a deferred signal to report. */
3525 if (dequeue_one_deferred_signal (event_child
, &w
))
3528 debug_printf ("dequeued one signal.\n");
3533 debug_printf ("no deferred signals.\n");
3535 if (stabilizing_threads
)
3537 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3538 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3542 debug_printf ("linux_wait_1 ret = %s, stopped "
3543 "while stabilizing threads\n",
3544 target_pid_to_str (ptid_of (current_thread
)));
3548 return ptid_of (current_thread
);
3554 /* Check whether GDB would be interested in this event. */
3556 /* Check if GDB is interested in this syscall. */
3558 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3559 && !gdb_catch_this_syscall_p (event_child
))
3563 debug_printf ("Ignored syscall for LWP %ld.\n",
3564 lwpid_of (current_thread
));
3567 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3572 return ignore_event (ourstatus
);
3575 /* If GDB is not interested in this signal, don't stop other
3576 threads, and don't report it to GDB. Just resume the inferior
3577 right away. We do this for threading-related signals as well as
3578 any that GDB specifically requested we ignore. But never ignore
3579 SIGSTOP if we sent it ourselves, and do not ignore signals when
3580 stepping - they may require special handling to skip the signal
3581 handler. Also never ignore signals that could be caused by a
3584 && current_thread
->last_resume_kind
!= resume_step
3586 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3587 (current_process ()->priv
->thread_db
!= NULL
3588 && (WSTOPSIG (w
) == __SIGRTMIN
3589 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3592 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3593 && !(WSTOPSIG (w
) == SIGSTOP
3594 && current_thread
->last_resume_kind
== resume_stop
)
3595 && !linux_wstatus_maybe_breakpoint (w
))))
3597 siginfo_t info
, *info_p
;
3600 debug_printf ("Ignored signal %d for LWP %ld.\n",
3601 WSTOPSIG (w
), lwpid_of (current_thread
));
3603 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3604 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3609 if (step_over_finished
)
3611 /* We cancelled this thread's step-over above. We still
3612 need to unsuspend all other LWPs, and set them back
3613 running again while the signal handler runs. */
3614 unsuspend_all_lwps (event_child
);
3616 /* Enqueue the pending signal info so that proceed_all_lwps
3618 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3620 proceed_all_lwps ();
3624 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3625 WSTOPSIG (w
), info_p
);
3631 return ignore_event (ourstatus
);
3634 /* Note that all addresses are always "out of the step range" when
3635 there's no range to begin with. */
3636 in_step_range
= lwp_in_step_range (event_child
);
3638 /* If GDB wanted this thread to single step, and the thread is out
3639 of the step range, we always want to report the SIGTRAP, and let
3640 GDB handle it. Watchpoints should always be reported. So should
3641 signals we can't explain. A SIGTRAP we can't explain could be a
3642 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3643 do, we're be able to handle GDB breakpoints on top of internal
3644 breakpoints, by handling the internal breakpoint and still
3645 reporting the event to GDB. If we don't, we're out of luck, GDB
3646 won't see the breakpoint hit. If we see a single-step event but
3647 the thread should be continuing, don't pass the trap to gdb.
3648 That indicates that we had previously finished a single-step but
3649 left the single-step pending -- see
3650 complete_ongoing_step_over. */
3651 report_to_gdb
= (!maybe_internal_trap
3652 || (current_thread
->last_resume_kind
== resume_step
3654 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3656 && !bp_explains_trap
3658 && !step_over_finished
3659 && !(current_thread
->last_resume_kind
== resume_continue
3660 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3661 || (gdb_breakpoint_here (event_child
->stop_pc
)
3662 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3663 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3664 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3666 run_breakpoint_commands (event_child
->stop_pc
);
3668 /* We found no reason GDB would want us to stop. We either hit one
3669 of our own breakpoints, or finished an internal step GDB
3670 shouldn't know about. */
3675 if (bp_explains_trap
)
3676 debug_printf ("Hit a gdbserver breakpoint.\n");
3677 if (step_over_finished
)
3678 debug_printf ("Step-over finished.\n");
3680 debug_printf ("Tracepoint event.\n");
3681 if (lwp_in_step_range (event_child
))
3682 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3683 paddress (event_child
->stop_pc
),
3684 paddress (event_child
->step_range_start
),
3685 paddress (event_child
->step_range_end
));
3688 /* We're not reporting this breakpoint to GDB, so apply the
3689 decr_pc_after_break adjustment to the inferior's regcache
3692 if (the_low_target
.set_pc
!= NULL
)
3694 struct regcache
*regcache
3695 = get_thread_regcache (current_thread
, 1);
3696 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3699 if (step_over_finished
)
3701 /* If we have finished stepping over a breakpoint, we've
3702 stopped and suspended all LWPs momentarily except the
3703 stepping one. This is where we resume them all again.
3704 We're going to keep waiting, so use proceed, which
3705 handles stepping over the next breakpoint. */
3706 unsuspend_all_lwps (event_child
);
3710 /* Remove the single-step breakpoints if any. Note that
3711 there isn't single-step breakpoint if we finished stepping
3713 if (can_software_single_step ()
3714 && has_single_step_breakpoints (current_thread
))
3716 stop_all_lwps (0, event_child
);
3717 delete_single_step_breakpoints (current_thread
);
3718 unstop_all_lwps (0, event_child
);
3723 debug_printf ("proceeding all threads.\n");
3724 proceed_all_lwps ();
3729 return ignore_event (ourstatus
);
3734 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3737 = target_waitstatus_to_string (&event_child
->waitstatus
);
3739 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3740 lwpid_of (get_lwp_thread (event_child
)), str
.c_str ());
3742 if (current_thread
->last_resume_kind
== resume_step
)
3744 if (event_child
->step_range_start
== event_child
->step_range_end
)
3745 debug_printf ("GDB wanted to single-step, reporting event.\n");
3746 else if (!lwp_in_step_range (event_child
))
3747 debug_printf ("Out of step range, reporting event.\n");
3749 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3750 debug_printf ("Stopped by watchpoint.\n");
3751 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3752 debug_printf ("Stopped by GDB breakpoint.\n");
3754 debug_printf ("Hit a non-gdbserver trap event.\n");
3757 /* Alright, we're going to report a stop. */
3759 /* Remove single-step breakpoints. */
3760 if (can_software_single_step ())
3762 /* Remove single-step breakpoints or not. It it is true, stop all
3763 lwps, so that other threads won't hit the breakpoint in the
3765 int remove_single_step_breakpoints_p
= 0;
3769 remove_single_step_breakpoints_p
3770 = has_single_step_breakpoints (current_thread
);
3774 /* In all-stop, a stop reply cancels all previous resume
3775 requests. Delete all single-step breakpoints. */
3776 struct inferior_list_entry
*inf
, *tmp
;
3778 ALL_INFERIORS (&all_threads
, inf
, tmp
)
3780 struct thread_info
*thread
= (struct thread_info
*) inf
;
3782 if (has_single_step_breakpoints (thread
))
3784 remove_single_step_breakpoints_p
= 1;
3790 if (remove_single_step_breakpoints_p
)
3792 /* If we remove single-step breakpoints from memory, stop all lwps,
3793 so that other threads won't hit the breakpoint in the staled
3795 stop_all_lwps (0, event_child
);
3799 gdb_assert (has_single_step_breakpoints (current_thread
));
3800 delete_single_step_breakpoints (current_thread
);
3804 struct inferior_list_entry
*inf
, *tmp
;
3806 ALL_INFERIORS (&all_threads
, inf
, tmp
)
3808 struct thread_info
*thread
= (struct thread_info
*) inf
;
3810 if (has_single_step_breakpoints (thread
))
3811 delete_single_step_breakpoints (thread
);
3815 unstop_all_lwps (0, event_child
);
3819 if (!stabilizing_threads
)
3821 /* In all-stop, stop all threads. */
3823 stop_all_lwps (0, NULL
);
3825 if (step_over_finished
)
3829 /* If we were doing a step-over, all other threads but
3830 the stepping one had been paused in start_step_over,
3831 with their suspend counts incremented. We don't want
3832 to do a full unstop/unpause, because we're in
3833 all-stop mode (so we want threads stopped), but we
3834 still need to unsuspend the other threads, to
3835 decrement their `suspended' count back. */
3836 unsuspend_all_lwps (event_child
);
3840 /* If we just finished a step-over, then all threads had
3841 been momentarily paused. In all-stop, that's fine,
3842 we want threads stopped by now anyway. In non-stop,
3843 we need to re-resume threads that GDB wanted to be
3845 unstop_all_lwps (1, event_child
);
3849 /* If we're not waiting for a specific LWP, choose an event LWP
3850 from among those that have had events. Giving equal priority
3851 to all LWPs that have had events helps prevent
3853 if (ptid_equal (ptid
, minus_one_ptid
))
3855 event_child
->status_pending_p
= 1;
3856 event_child
->status_pending
= w
;
3858 select_event_lwp (&event_child
);
3860 /* current_thread and event_child must stay in sync. */
3861 current_thread
= get_lwp_thread (event_child
);
3863 event_child
->status_pending_p
= 0;
3864 w
= event_child
->status_pending
;
3868 /* Stabilize threads (move out of jump pads). */
3870 stabilize_threads ();
3874 /* If we just finished a step-over, then all threads had been
3875 momentarily paused. In all-stop, that's fine, we want
3876 threads stopped by now anyway. In non-stop, we need to
3877 re-resume threads that GDB wanted to be running. */
3878 if (step_over_finished
)
3879 unstop_all_lwps (1, event_child
);
3882 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3884 /* If the reported event is an exit, fork, vfork or exec, let
3887 /* Break the unreported fork relationship chain. */
3888 if (event_child
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
3889 || event_child
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
)
3891 event_child
->fork_relative
->fork_relative
= NULL
;
3892 event_child
->fork_relative
= NULL
;
3895 *ourstatus
= event_child
->waitstatus
;
3896 /* Clear the event lwp's waitstatus since we handled it already. */
3897 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3900 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3902 /* Now that we've selected our final event LWP, un-adjust its PC if
3903 it was a software breakpoint, and the client doesn't know we can
3904 adjust the breakpoint ourselves. */
3905 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3906 && !swbreak_feature
)
3908 int decr_pc
= the_low_target
.decr_pc_after_break
;
3912 struct regcache
*regcache
3913 = get_thread_regcache (current_thread
, 1);
3914 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3918 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3920 get_syscall_trapinfo (event_child
,
3921 &ourstatus
->value
.syscall_number
);
3922 ourstatus
->kind
= event_child
->syscall_state
;
3924 else if (current_thread
->last_resume_kind
== resume_stop
3925 && WSTOPSIG (w
) == SIGSTOP
)
3927 /* A thread that has been requested to stop by GDB with vCont;t,
3928 and it stopped cleanly, so report as SIG0. The use of
3929 SIGSTOP is an implementation detail. */
3930 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3932 else if (current_thread
->last_resume_kind
== resume_stop
3933 && WSTOPSIG (w
) != SIGSTOP
)
3935 /* A thread that has been requested to stop by GDB with vCont;t,
3936 but, it stopped for other reasons. */
3937 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3939 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3941 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3944 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3948 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3949 target_pid_to_str (ptid_of (current_thread
)),
3950 ourstatus
->kind
, ourstatus
->value
.sig
);
3954 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3955 return filter_exit_event (event_child
, ourstatus
);
3957 return ptid_of (current_thread
);
3960 /* Get rid of any pending event in the pipe. */
3962 async_file_flush (void)
3968 ret
= read (linux_event_pipe
[0], &buf
, 1);
3969 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3972 /* Put something in the pipe, so the event loop wakes up. */
3974 async_file_mark (void)
3978 async_file_flush ();
3981 ret
= write (linux_event_pipe
[1], "+", 1);
3982 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3984 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3985 be awakened anyway. */
3989 linux_wait (ptid_t ptid
,
3990 struct target_waitstatus
*ourstatus
, int target_options
)
3994 /* Flush the async file first. */
3995 if (target_is_async_p ())
3996 async_file_flush ();
4000 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
4002 while ((target_options
& TARGET_WNOHANG
) == 0
4003 && ptid_equal (event_ptid
, null_ptid
)
4004 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
4006 /* If at least one stop was reported, there may be more. A single
4007 SIGCHLD can signal more than one child stop. */
4008 if (target_is_async_p ()
4009 && (target_options
& TARGET_WNOHANG
) != 0
4010 && !ptid_equal (event_ptid
, null_ptid
))
4016 /* Send a signal to an LWP. */
4019 kill_lwp (unsigned long lwpid
, int signo
)
4024 ret
= syscall (__NR_tkill
, lwpid
, signo
);
4025 if (errno
== ENOSYS
)
4027 /* If tkill fails, then we are not using nptl threads, a
4028 configuration we no longer support. */
4029 perror_with_name (("tkill"));
4035 linux_stop_lwp (struct lwp_info
*lwp
)
4041 send_sigstop (struct lwp_info
*lwp
)
4045 pid
= lwpid_of (get_lwp_thread (lwp
));
4047 /* If we already have a pending stop signal for this process, don't
4049 if (lwp
->stop_expected
)
4052 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
4058 debug_printf ("Sending sigstop to lwp %d\n", pid
);
4060 lwp
->stop_expected
= 1;
4061 kill_lwp (pid
, SIGSTOP
);
4065 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
4067 struct thread_info
*thread
= (struct thread_info
*) entry
;
4068 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4070 /* Ignore EXCEPT. */
4081 /* Increment the suspend count of an LWP, and stop it, if not stopped
4084 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
4087 struct thread_info
*thread
= (struct thread_info
*) entry
;
4088 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4090 /* Ignore EXCEPT. */
4094 lwp_suspended_inc (lwp
);
4096 return send_sigstop_callback (entry
, except
);
4100 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
4102 /* Store the exit status for later. */
4103 lwp
->status_pending_p
= 1;
4104 lwp
->status_pending
= wstat
;
4106 /* Store in waitstatus as well, as there's nothing else to process
4108 if (WIFEXITED (wstat
))
4110 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
4111 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
4113 else if (WIFSIGNALED (wstat
))
4115 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
4116 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
4119 /* Prevent trying to stop it. */
4122 /* No further stops are expected from a dead lwp. */
4123 lwp
->stop_expected
= 0;
4126 /* Return true if LWP has exited already, and has a pending exit event
4127 to report to GDB. */
4130 lwp_is_marked_dead (struct lwp_info
*lwp
)
4132 return (lwp
->status_pending_p
4133 && (WIFEXITED (lwp
->status_pending
)
4134 || WIFSIGNALED (lwp
->status_pending
)));
4137 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4140 wait_for_sigstop (void)
4142 struct thread_info
*saved_thread
;
4147 saved_thread
= current_thread
;
4148 if (saved_thread
!= NULL
)
4149 saved_tid
= saved_thread
->entry
.id
;
4151 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4154 debug_printf ("wait_for_sigstop: pulling events\n");
4156 /* Passing NULL_PTID as filter indicates we want all events to be
4157 left pending. Eventually this returns when there are no
4158 unwaited-for children left. */
4159 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4161 gdb_assert (ret
== -1);
4163 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4164 current_thread
= saved_thread
;
4168 debug_printf ("Previously current thread died.\n");
4170 /* We can't change the current inferior behind GDB's back,
4171 otherwise, a subsequent command may apply to the wrong
4173 current_thread
= NULL
;
4177 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
4178 move it out, because we need to report the stop event to GDB. For
4179 example, if the user puts a breakpoint in the jump pad, it's
4180 because she wants to debug it. */
4183 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
4185 struct thread_info
*thread
= (struct thread_info
*) entry
;
4186 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4188 if (lwp
->suspended
!= 0)
4190 internal_error (__FILE__
, __LINE__
,
4191 "LWP %ld is suspended, suspended=%d\n",
4192 lwpid_of (thread
), lwp
->suspended
);
4194 gdb_assert (lwp
->stopped
);
4196 /* Allow debugging the jump pad, gdb_collect, etc.. */
4197 return (supports_fast_tracepoints ()
4198 && agent_loaded_p ()
4199 && (gdb_breakpoint_here (lwp
->stop_pc
)
4200 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4201 || thread
->last_resume_kind
== resume_step
)
4202 && (linux_fast_tracepoint_collecting (lwp
, NULL
)
4203 != fast_tpoint_collect_result::not_collecting
));
4207 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
4209 struct thread_info
*thread
= (struct thread_info
*) entry
;
4210 struct thread_info
*saved_thread
;
4211 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4214 if (lwp
->suspended
!= 0)
4216 internal_error (__FILE__
, __LINE__
,
4217 "LWP %ld is suspended, suspended=%d\n",
4218 lwpid_of (thread
), lwp
->suspended
);
4220 gdb_assert (lwp
->stopped
);
4222 /* For gdb_breakpoint_here. */
4223 saved_thread
= current_thread
;
4224 current_thread
= thread
;
4226 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4228 /* Allow debugging the jump pad, gdb_collect, etc. */
4229 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4230 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4231 && thread
->last_resume_kind
!= resume_step
4232 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4235 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4240 lwp
->status_pending_p
= 0;
4241 enqueue_one_deferred_signal (lwp
, wstat
);
4244 debug_printf ("Signal %d for LWP %ld deferred "
4246 WSTOPSIG (*wstat
), lwpid_of (thread
));
4249 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4252 lwp_suspended_inc (lwp
);
4254 current_thread
= saved_thread
;
4258 lwp_running (struct inferior_list_entry
*entry
, void *data
)
4260 struct thread_info
*thread
= (struct thread_info
*) entry
;
4261 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4263 if (lwp_is_marked_dead (lwp
))
4270 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4271 If SUSPEND, then also increase the suspend count of every LWP,
4275 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4277 /* Should not be called recursively. */
4278 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4283 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4284 suspend
? "stop-and-suspend" : "stop",
4286 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4290 stopping_threads
= (suspend
4291 ? STOPPING_AND_SUSPENDING_THREADS
4292 : STOPPING_THREADS
);
4295 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
4297 find_inferior (&all_threads
, send_sigstop_callback
, except
);
4298 wait_for_sigstop ();
4299 stopping_threads
= NOT_STOPPING_THREADS
;
4303 debug_printf ("stop_all_lwps done, setting stopping_threads "
4304 "back to !stopping\n");
4309 /* Enqueue one signal in the chain of signals which need to be
4310 delivered to this process on next resume. */
4313 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4315 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4317 p_sig
->prev
= lwp
->pending_signals
;
4318 p_sig
->signal
= signal
;
4320 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4322 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4323 lwp
->pending_signals
= p_sig
;
4326 /* Install breakpoints for software single stepping. */
4329 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4331 struct thread_info
*thread
= get_lwp_thread (lwp
);
4332 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4333 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
4335 current_thread
= thread
;
4336 std::vector
<CORE_ADDR
> next_pcs
= the_low_target
.get_next_pcs (regcache
);
4338 for (CORE_ADDR pc
: next_pcs
)
4339 set_single_step_breakpoint (pc
, current_ptid
);
4341 do_cleanups (old_chain
);
4344 /* Single step via hardware or software single step.
4345 Return 1 if hardware single stepping, 0 if software single stepping
4346 or can't single step. */
4349 single_step (struct lwp_info
* lwp
)
4353 if (can_hardware_single_step ())
4357 else if (can_software_single_step ())
4359 install_software_single_step_breakpoints (lwp
);
4365 debug_printf ("stepping is not implemented on this target");
4371 /* The signal can be delivered to the inferior if we are not trying to
4372 finish a fast tracepoint collect. Since signal can be delivered in
4373 the step-over, the program may go to signal handler and trap again
4374 after return from the signal handler. We can live with the spurious
4378 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4380 return (lwp
->collecting_fast_tracepoint
4381 == fast_tpoint_collect_result::not_collecting
);
4384 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4385 SIGNAL is nonzero, give it that signal. */
4388 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4389 int step
, int signal
, siginfo_t
*info
)
4391 struct thread_info
*thread
= get_lwp_thread (lwp
);
4392 struct thread_info
*saved_thread
;
4394 struct process_info
*proc
= get_thread_process (thread
);
4396 /* Note that target description may not be initialised
4397 (proc->tdesc == NULL) at this point because the program hasn't
4398 stopped at the first instruction yet. It means GDBserver skips
4399 the extra traps from the wrapper program (see option --wrapper).
4400 Code in this function that requires register access should be
4401 guarded by proc->tdesc == NULL or something else. */
4403 if (lwp
->stopped
== 0)
4406 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4408 fast_tpoint_collect_result fast_tp_collecting
4409 = lwp
->collecting_fast_tracepoint
;
4411 gdb_assert (!stabilizing_threads
4412 || (fast_tp_collecting
4413 != fast_tpoint_collect_result::not_collecting
));
4415 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4416 user used the "jump" command, or "set $pc = foo"). */
4417 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4419 /* Collecting 'while-stepping' actions doesn't make sense
4421 release_while_stepping_state_list (thread
);
4424 /* If we have pending signals or status, and a new signal, enqueue the
4425 signal. Also enqueue the signal if it can't be delivered to the
4426 inferior right now. */
4428 && (lwp
->status_pending_p
4429 || lwp
->pending_signals
!= NULL
4430 || !lwp_signal_can_be_delivered (lwp
)))
4432 enqueue_pending_signal (lwp
, signal
, info
);
4434 /* Postpone any pending signal. It was enqueued above. */
4438 if (lwp
->status_pending_p
)
4441 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4442 " has pending status\n",
4443 lwpid_of (thread
), step
? "step" : "continue",
4444 lwp
->stop_expected
? "expected" : "not expected");
4448 saved_thread
= current_thread
;
4449 current_thread
= thread
;
4451 /* This bit needs some thinking about. If we get a signal that
4452 we must report while a single-step reinsert is still pending,
4453 we often end up resuming the thread. It might be better to
4454 (ew) allow a stack of pending events; then we could be sure that
4455 the reinsert happened right away and not lose any signals.
4457 Making this stack would also shrink the window in which breakpoints are
4458 uninserted (see comment in linux_wait_for_lwp) but not enough for
4459 complete correctness, so it won't solve that problem. It may be
4460 worthwhile just to solve this one, however. */
4461 if (lwp
->bp_reinsert
!= 0)
4464 debug_printf (" pending reinsert at 0x%s\n",
4465 paddress (lwp
->bp_reinsert
));
4467 if (can_hardware_single_step ())
4469 if (fast_tp_collecting
== fast_tpoint_collect_result::not_collecting
)
4472 warning ("BAD - reinserting but not stepping.");
4474 warning ("BAD - reinserting and suspended(%d).",
4479 step
= maybe_hw_step (thread
);
4482 if (fast_tp_collecting
== fast_tpoint_collect_result::before_insn
)
4485 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4486 " (exit-jump-pad-bkpt)\n",
4489 else if (fast_tp_collecting
== fast_tpoint_collect_result::at_insn
)
4492 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4493 " single-stepping\n",
4496 if (can_hardware_single_step ())
4500 internal_error (__FILE__
, __LINE__
,
4501 "moving out of jump pad single-stepping"
4502 " not implemented on this target");
4506 /* If we have while-stepping actions in this thread set it stepping.
4507 If we have a signal to deliver, it may or may not be set to
4508 SIG_IGN, we don't know. Assume so, and allow collecting
4509 while-stepping into a signal handler. A possible smart thing to
4510 do would be to set an internal breakpoint at the signal return
4511 address, continue, and carry on catching this while-stepping
4512 action only when that breakpoint is hit. A future
4514 if (thread
->while_stepping
!= NULL
)
4517 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4520 step
= single_step (lwp
);
4523 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4525 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4527 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4531 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4532 (long) lwp
->stop_pc
);
4536 /* If we have pending signals, consume one if it can be delivered to
4538 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4540 struct pending_signals
**p_sig
;
4542 p_sig
= &lwp
->pending_signals
;
4543 while ((*p_sig
)->prev
!= NULL
)
4544 p_sig
= &(*p_sig
)->prev
;
4546 signal
= (*p_sig
)->signal
;
4547 if ((*p_sig
)->info
.si_signo
!= 0)
4548 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4556 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4557 lwpid_of (thread
), step
? "step" : "continue", signal
,
4558 lwp
->stop_expected
? "expected" : "not expected");
4560 if (the_low_target
.prepare_to_resume
!= NULL
)
4561 the_low_target
.prepare_to_resume (lwp
);
4563 regcache_invalidate_thread (thread
);
4565 lwp
->stepping
= step
;
4567 ptrace_request
= PTRACE_SINGLESTEP
;
4568 else if (gdb_catching_syscalls_p (lwp
))
4569 ptrace_request
= PTRACE_SYSCALL
;
4571 ptrace_request
= PTRACE_CONT
;
4572 ptrace (ptrace_request
,
4574 (PTRACE_TYPE_ARG3
) 0,
4575 /* Coerce to a uintptr_t first to avoid potential gcc warning
4576 of coercing an 8 byte integer to a 4 byte pointer. */
4577 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4579 current_thread
= saved_thread
;
4581 perror_with_name ("resuming thread");
4583 /* Successfully resumed. Clear state that no longer makes sense,
4584 and mark the LWP as running. Must not do this before resuming
4585 otherwise if that fails other code will be confused. E.g., we'd
4586 later try to stop the LWP and hang forever waiting for a stop
4587 status. Note that we must not throw after this is cleared,
4588 otherwise handle_zombie_lwp_error would get confused. */
4590 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4593 /* Called when we try to resume a stopped LWP and that errors out. If
4594 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4595 or about to become), discard the error, clear any pending status
4596 the LWP may have, and return true (we'll collect the exit status
4597 soon enough). Otherwise, return false. */
4600 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4602 struct thread_info
*thread
= get_lwp_thread (lp
);
4604 /* If we get an error after resuming the LWP successfully, we'd
4605 confuse !T state for the LWP being gone. */
4606 gdb_assert (lp
->stopped
);
4608 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4609 because even if ptrace failed with ESRCH, the tracee may be "not
4610 yet fully dead", but already refusing ptrace requests. In that
4611 case the tracee has 'R (Running)' state for a little bit
4612 (observed in Linux 3.18). See also the note on ESRCH in the
4613 ptrace(2) man page. Instead, check whether the LWP has any state
4614 other than ptrace-stopped. */
4616 /* Don't assume anything if /proc/PID/status can't be read. */
4617 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4619 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4620 lp
->status_pending_p
= 0;
4626 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4627 disappears while we try to resume it. */
4630 linux_resume_one_lwp (struct lwp_info
*lwp
,
4631 int step
, int signal
, siginfo_t
*info
)
4635 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4637 CATCH (ex
, RETURN_MASK_ERROR
)
4639 if (!check_ptrace_stopped_lwp_gone (lwp
))
4640 throw_exception (ex
);
4645 struct thread_resume_array
4647 struct thread_resume
*resume
;
4651 /* This function is called once per thread via find_inferior.
4652 ARG is a pointer to a thread_resume_array struct.
4653 We look up the thread specified by ENTRY in ARG, and mark the thread
4654 with a pointer to the appropriate resume request.
4656 This algorithm is O(threads * resume elements), but resume elements
4657 is small (and will remain small at least until GDB supports thread
4661 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
4663 struct thread_info
*thread
= (struct thread_info
*) entry
;
4664 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4666 struct thread_resume_array
*r
;
4668 r
= (struct thread_resume_array
*) arg
;
4670 for (ndx
= 0; ndx
< r
->n
; ndx
++)
4672 ptid_t ptid
= r
->resume
[ndx
].thread
;
4673 if (ptid_equal (ptid
, minus_one_ptid
)
4674 || ptid_equal (ptid
, entry
->id
)
4675 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4677 || (ptid_get_pid (ptid
) == pid_of (thread
)
4678 && (ptid_is_pid (ptid
)
4679 || ptid_get_lwp (ptid
) == -1)))
4681 if (r
->resume
[ndx
].kind
== resume_stop
4682 && thread
->last_resume_kind
== resume_stop
)
4685 debug_printf ("already %s LWP %ld at GDB's request\n",
4686 (thread
->last_status
.kind
4687 == TARGET_WAITKIND_STOPPED
)
4695 /* Ignore (wildcard) resume requests for already-resumed
4697 if (r
->resume
[ndx
].kind
!= resume_stop
4698 && thread
->last_resume_kind
!= resume_stop
)
4701 debug_printf ("already %s LWP %ld at GDB's request\n",
4702 (thread
->last_resume_kind
4710 /* Don't let wildcard resumes resume fork children that GDB
4711 does not yet know are new fork children. */
4712 if (lwp
->fork_relative
!= NULL
)
4714 struct inferior_list_entry
*inf
, *tmp
;
4715 struct lwp_info
*rel
= lwp
->fork_relative
;
4717 if (rel
->status_pending_p
4718 && (rel
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
4719 || rel
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
))
4722 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4728 /* If the thread has a pending event that has already been
4729 reported to GDBserver core, but GDB has not pulled the
4730 event out of the vStopped queue yet, likewise, ignore the
4731 (wildcard) resume request. */
4732 if (in_queued_stop_replies (entry
->id
))
4735 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4740 lwp
->resume
= &r
->resume
[ndx
];
4741 thread
->last_resume_kind
= lwp
->resume
->kind
;
4743 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4744 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4746 /* If we had a deferred signal to report, dequeue one now.
4747 This can happen if LWP gets more than one signal while
4748 trying to get out of a jump pad. */
4750 && !lwp
->status_pending_p
4751 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4753 lwp
->status_pending_p
= 1;
4756 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4757 "leaving status pending.\n",
4758 WSTOPSIG (lwp
->status_pending
),
4766 /* No resume action for this thread. */
4772 /* find_inferior callback for linux_resume.
4773 Set *FLAG_P if this lwp has an interesting status pending. */
4776 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
4778 struct thread_info
*thread
= (struct thread_info
*) entry
;
4779 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4781 /* LWPs which will not be resumed are not interesting, because
4782 we might not wait for them next time through linux_wait. */
4783 if (lwp
->resume
== NULL
)
4786 if (thread_still_has_status_pending_p (thread
))
4787 * (int *) flag_p
= 1;
4792 /* Return 1 if this lwp that GDB wants running is stopped at an
4793 internal breakpoint that we need to step over. It assumes that any
4794 required STOP_PC adjustment has already been propagated to the
4795 inferior's regcache. */
4798 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
4800 struct thread_info
*thread
= (struct thread_info
*) entry
;
4801 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4802 struct thread_info
*saved_thread
;
4804 struct process_info
*proc
= get_thread_process (thread
);
4806 /* GDBserver is skipping the extra traps from the wrapper program,
4807 don't have to do step over. */
4808 if (proc
->tdesc
== NULL
)
4811 /* LWPs which will not be resumed are not interesting, because we
4812 might not wait for them next time through linux_wait. */
4817 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4822 if (thread
->last_resume_kind
== resume_stop
)
4825 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4831 gdb_assert (lwp
->suspended
>= 0);
4836 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4841 if (lwp
->status_pending_p
)
4844 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4850 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4854 /* If the PC has changed since we stopped, then don't do anything,
4855 and let the breakpoint/tracepoint be hit. This happens if, for
4856 instance, GDB handled the decr_pc_after_break subtraction itself,
4857 GDB is OOL stepping this thread, or the user has issued a "jump"
4858 command, or poked thread's registers herself. */
4859 if (pc
!= lwp
->stop_pc
)
4862 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4863 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4865 paddress (lwp
->stop_pc
), paddress (pc
));
4869 /* On software single step target, resume the inferior with signal
4870 rather than stepping over. */
4871 if (can_software_single_step ()
4872 && lwp
->pending_signals
!= NULL
4873 && lwp_signal_can_be_delivered (lwp
))
4876 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4883 saved_thread
= current_thread
;
4884 current_thread
= thread
;
4886 /* We can only step over breakpoints we know about. */
4887 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4889 /* Don't step over a breakpoint that GDB expects to hit
4890 though. If the condition is being evaluated on the target's side
4891 and it evaluate to false, step over this breakpoint as well. */
4892 if (gdb_breakpoint_here (pc
)
4893 && gdb_condition_true_at_breakpoint (pc
)
4894 && gdb_no_commands_at_breakpoint (pc
))
4897 debug_printf ("Need step over [LWP %ld]? yes, but found"
4898 " GDB breakpoint at 0x%s; skipping step over\n",
4899 lwpid_of (thread
), paddress (pc
));
4901 current_thread
= saved_thread
;
4907 debug_printf ("Need step over [LWP %ld]? yes, "
4908 "found breakpoint at 0x%s\n",
4909 lwpid_of (thread
), paddress (pc
));
4911 /* We've found an lwp that needs stepping over --- return 1 so
4912 that find_inferior stops looking. */
4913 current_thread
= saved_thread
;
4919 current_thread
= saved_thread
;
4922 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4924 lwpid_of (thread
), paddress (pc
));
4929 /* Start a step-over operation on LWP. When LWP stopped at a
4930 breakpoint, to make progress, we need to remove the breakpoint out
4931 of the way. If we let other threads run while we do that, they may
4932 pass by the breakpoint location and miss hitting it. To avoid
4933 that, a step-over momentarily stops all threads while LWP is
4934 single-stepped by either hardware or software while the breakpoint
4935 is temporarily uninserted from the inferior. When the single-step
4936 finishes, we reinsert the breakpoint, and let all threads that are
4937 supposed to be running, run again. */
4940 start_step_over (struct lwp_info
*lwp
)
4942 struct thread_info
*thread
= get_lwp_thread (lwp
);
4943 struct thread_info
*saved_thread
;
4948 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4951 stop_all_lwps (1, lwp
);
4953 if (lwp
->suspended
!= 0)
4955 internal_error (__FILE__
, __LINE__
,
4956 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4961 debug_printf ("Done stopping all threads for step-over.\n");
4963 /* Note, we should always reach here with an already adjusted PC,
4964 either by GDB (if we're resuming due to GDB's request), or by our
4965 caller, if we just finished handling an internal breakpoint GDB
4966 shouldn't care about. */
4969 saved_thread
= current_thread
;
4970 current_thread
= thread
;
4972 lwp
->bp_reinsert
= pc
;
4973 uninsert_breakpoints_at (pc
);
4974 uninsert_fast_tracepoint_jumps_at (pc
);
4976 step
= single_step (lwp
);
4978 current_thread
= saved_thread
;
4980 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4982 /* Require next event from this LWP. */
4983 step_over_bkpt
= thread
->entry
.id
;
4987 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4988 start_step_over, if still there, and delete any single-step
4989 breakpoints we've set, on non hardware single-step targets. */
4992 finish_step_over (struct lwp_info
*lwp
)
4994 if (lwp
->bp_reinsert
!= 0)
4996 struct thread_info
*saved_thread
= current_thread
;
4999 debug_printf ("Finished step over.\n");
5001 current_thread
= get_lwp_thread (lwp
);
5003 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
5004 may be no breakpoint to reinsert there by now. */
5005 reinsert_breakpoints_at (lwp
->bp_reinsert
);
5006 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
5008 lwp
->bp_reinsert
= 0;
5010 /* Delete any single-step breakpoints. No longer needed. We
5011 don't have to worry about other threads hitting this trap,
5012 and later not being able to explain it, because we were
5013 stepping over a breakpoint, and we hold all threads but
5014 LWP stopped while doing that. */
5015 if (!can_hardware_single_step ())
5017 gdb_assert (has_single_step_breakpoints (current_thread
));
5018 delete_single_step_breakpoints (current_thread
);
5021 step_over_bkpt
= null_ptid
;
5022 current_thread
= saved_thread
;
5029 /* If there's a step over in progress, wait until all threads stop
5030 (that is, until the stepping thread finishes its step), and
5031 unsuspend all lwps. The stepping thread ends with its status
5032 pending, which is processed later when we get back to processing
5036 complete_ongoing_step_over (void)
5038 if (!ptid_equal (step_over_bkpt
, null_ptid
))
5040 struct lwp_info
*lwp
;
5045 debug_printf ("detach: step over in progress, finish it first\n");
5047 /* Passing NULL_PTID as filter indicates we want all events to
5048 be left pending. Eventually this returns when there are no
5049 unwaited-for children left. */
5050 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
5052 gdb_assert (ret
== -1);
5054 lwp
= find_lwp_pid (step_over_bkpt
);
5056 finish_step_over (lwp
);
5057 step_over_bkpt
= null_ptid
;
5058 unsuspend_all_lwps (lwp
);
5062 /* This function is called once per thread. We check the thread's resume
5063 request, which will tell us whether to resume, step, or leave the thread
5064 stopped; and what signal, if any, it should be sent.
5066 For threads which we aren't explicitly told otherwise, we preserve
5067 the stepping flag; this is used for stepping over gdbserver-placed
5070 If pending_flags was set in any thread, we queue any needed
5071 signals, since we won't actually resume. We already have a pending
5072 event to report, so we don't need to preserve any step requests;
5073 they should be re-issued if necessary. */
5076 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
5078 struct thread_info
*thread
= (struct thread_info
*) entry
;
5079 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5080 int leave_all_stopped
= * (int *) arg
;
5083 if (lwp
->resume
== NULL
)
5086 if (lwp
->resume
->kind
== resume_stop
)
5089 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
5094 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
5096 /* Stop the thread, and wait for the event asynchronously,
5097 through the event loop. */
5103 debug_printf ("already stopped LWP %ld\n",
5106 /* The LWP may have been stopped in an internal event that
5107 was not meant to be notified back to GDB (e.g., gdbserver
5108 breakpoint), so we should be reporting a stop event in
5111 /* If the thread already has a pending SIGSTOP, this is a
5112 no-op. Otherwise, something later will presumably resume
5113 the thread and this will cause it to cancel any pending
5114 operation, due to last_resume_kind == resume_stop. If
5115 the thread already has a pending status to report, we
5116 will still report it the next time we wait - see
5117 status_pending_p_callback. */
5119 /* If we already have a pending signal to report, then
5120 there's no need to queue a SIGSTOP, as this means we're
5121 midway through moving the LWP out of the jumppad, and we
5122 will report the pending signal as soon as that is
5124 if (lwp
->pending_signals_to_report
== NULL
)
5128 /* For stop requests, we're done. */
5130 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5134 /* If this thread which is about to be resumed has a pending status,
5135 then don't resume it - we can just report the pending status.
5136 Likewise if it is suspended, because e.g., another thread is
5137 stepping past a breakpoint. Make sure to queue any signals that
5138 would otherwise be sent. In all-stop mode, we do this decision
5139 based on if *any* thread has a pending status. If there's a
5140 thread that needs the step-over-breakpoint dance, then don't
5141 resume any other thread but that particular one. */
5142 leave_pending
= (lwp
->suspended
5143 || lwp
->status_pending_p
5144 || leave_all_stopped
);
5146 /* If we have a new signal, enqueue the signal. */
5147 if (lwp
->resume
->sig
!= 0)
5149 siginfo_t info
, *info_p
;
5151 /* If this is the same signal we were previously stopped by,
5152 make sure to queue its siginfo. */
5153 if (WIFSTOPPED (lwp
->last_status
)
5154 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
5155 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
5156 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
5161 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
5167 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
5169 proceed_one_lwp (entry
, NULL
);
5174 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5177 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5183 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5185 struct thread_resume_array array
= { resume_info
, n
};
5186 struct thread_info
*need_step_over
= NULL
;
5188 int leave_all_stopped
;
5193 debug_printf ("linux_resume:\n");
5196 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
5198 /* If there is a thread which would otherwise be resumed, which has
5199 a pending status, then don't resume any threads - we can just
5200 report the pending status. Make sure to queue any signals that
5201 would otherwise be sent. In non-stop mode, we'll apply this
5202 logic to each thread individually. We consume all pending events
5203 before considering to start a step-over (in all-stop). */
5206 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
5208 /* If there is a thread which would otherwise be resumed, which is
5209 stopped at a breakpoint that needs stepping over, then don't
5210 resume any threads - have it step over the breakpoint with all
5211 other threads stopped, then resume all threads again. Make sure
5212 to queue any signals that would otherwise be delivered or
5214 if (!any_pending
&& supports_breakpoints ())
5216 = (struct thread_info
*) find_inferior (&all_threads
,
5217 need_step_over_p
, NULL
);
5219 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5223 if (need_step_over
!= NULL
)
5224 debug_printf ("Not resuming all, need step over\n");
5225 else if (any_pending
)
5226 debug_printf ("Not resuming, all-stop and found "
5227 "an LWP with pending status\n");
5229 debug_printf ("Resuming, no pending status or step over needed\n");
5232 /* Even if we're leaving threads stopped, queue all signals we'd
5233 otherwise deliver. */
5234 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
5237 start_step_over (get_thread_lwp (need_step_over
));
5241 debug_printf ("linux_resume done\n");
5245 /* We may have events that were pending that can/should be sent to
5246 the client now. Trigger a linux_wait call. */
5247 if (target_is_async_p ())
5251 /* This function is called once per thread. We check the thread's
5252 last resume request, which will tell us whether to resume, step, or
5253 leave the thread stopped. Any signal the client requested to be
5254 delivered has already been enqueued at this point.
5256 If any thread that GDB wants running is stopped at an internal
5257 breakpoint that needs stepping over, we start a step-over operation
5258 on that particular thread, and leave all others stopped. */
5261 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
5263 struct thread_info
*thread
= (struct thread_info
*) entry
;
5264 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5271 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5276 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5280 if (thread
->last_resume_kind
== resume_stop
5281 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5284 debug_printf (" client wants LWP to remain %ld stopped\n",
5289 if (lwp
->status_pending_p
)
5292 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5297 gdb_assert (lwp
->suspended
>= 0);
5302 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5306 if (thread
->last_resume_kind
== resume_stop
5307 && lwp
->pending_signals_to_report
== NULL
5308 && (lwp
->collecting_fast_tracepoint
5309 == fast_tpoint_collect_result::not_collecting
))
5311 /* We haven't reported this LWP as stopped yet (otherwise, the
5312 last_status.kind check above would catch it, and we wouldn't
5313 reach here. This LWP may have been momentarily paused by a
5314 stop_all_lwps call while handling for example, another LWP's
5315 step-over. In that case, the pending expected SIGSTOP signal
5316 that was queued at vCont;t handling time will have already
5317 been consumed by wait_for_sigstop, and so we need to requeue
5318 another one here. Note that if the LWP already has a SIGSTOP
5319 pending, this is a no-op. */
5322 debug_printf ("Client wants LWP %ld to stop. "
5323 "Making sure it has a SIGSTOP pending\n",
5329 if (thread
->last_resume_kind
== resume_step
)
5332 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5335 /* If resume_step is requested by GDB, install single-step
5336 breakpoints when the thread is about to be actually resumed if
5337 the single-step breakpoints weren't removed. */
5338 if (can_software_single_step ()
5339 && !has_single_step_breakpoints (thread
))
5340 install_software_single_step_breakpoints (lwp
);
5342 step
= maybe_hw_step (thread
);
5344 else if (lwp
->bp_reinsert
!= 0)
5347 debug_printf (" stepping LWP %ld, reinsert set\n",
5350 step
= maybe_hw_step (thread
);
5355 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5360 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
5362 struct thread_info
*thread
= (struct thread_info
*) entry
;
5363 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5368 lwp_suspended_decr (lwp
);
5370 return proceed_one_lwp (entry
, except
);
5373 /* When we finish a step-over, set threads running again. If there's
5374 another thread that may need a step-over, now's the time to start
5375 it. Eventually, we'll move all threads past their breakpoints. */
5378 proceed_all_lwps (void)
5380 struct thread_info
*need_step_over
;
5382 /* If there is a thread which would otherwise be resumed, which is
5383 stopped at a breakpoint that needs stepping over, then don't
5384 resume any threads - have it step over the breakpoint with all
5385 other threads stopped, then resume all threads again. */
5387 if (supports_breakpoints ())
5390 = (struct thread_info
*) find_inferior (&all_threads
,
5391 need_step_over_p
, NULL
);
5393 if (need_step_over
!= NULL
)
5396 debug_printf ("proceed_all_lwps: found "
5397 "thread %ld needing a step-over\n",
5398 lwpid_of (need_step_over
));
5400 start_step_over (get_thread_lwp (need_step_over
));
5406 debug_printf ("Proceeding, no step-over needed\n");
5408 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
5411 /* Stopped LWPs that the client wanted to be running, that don't have
5412 pending statuses, are set to run again, except for EXCEPT, if not
5413 NULL. This undoes a stop_all_lwps call. */
5416 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5422 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5423 lwpid_of (get_lwp_thread (except
)));
5425 debug_printf ("unstopping all lwps\n");
5429 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
5431 find_inferior (&all_threads
, proceed_one_lwp
, except
);
5435 debug_printf ("unstop_all_lwps done\n");
5441 #ifdef HAVE_LINUX_REGSETS
5443 #define use_linux_regsets 1
5445 /* Returns true if REGSET has been disabled. */
5448 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5450 return (info
->disabled_regsets
!= NULL
5451 && info
->disabled_regsets
[regset
- info
->regsets
]);
5454 /* Disable REGSET. */
5457 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5461 dr_offset
= regset
- info
->regsets
;
5462 if (info
->disabled_regsets
== NULL
)
5463 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5464 info
->disabled_regsets
[dr_offset
] = 1;
5468 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5469 struct regcache
*regcache
)
5471 struct regset_info
*regset
;
5472 int saw_general_regs
= 0;
5476 pid
= lwpid_of (current_thread
);
5477 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5482 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5485 buf
= xmalloc (regset
->size
);
5487 nt_type
= regset
->nt_type
;
5491 iov
.iov_len
= regset
->size
;
5492 data
= (void *) &iov
;
5498 res
= ptrace (regset
->get_request
, pid
,
5499 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5501 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5507 /* If we get EIO on a regset, do not try it again for
5508 this process mode. */
5509 disable_regset (regsets_info
, regset
);
5511 else if (errno
== ENODATA
)
5513 /* ENODATA may be returned if the regset is currently
5514 not "active". This can happen in normal operation,
5515 so suppress the warning in this case. */
5517 else if (errno
== ESRCH
)
5519 /* At this point, ESRCH should mean the process is
5520 already gone, in which case we simply ignore attempts
5521 to read its registers. */
5526 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5533 if (regset
->type
== GENERAL_REGS
)
5534 saw_general_regs
= 1;
5535 regset
->store_function (regcache
, buf
);
5539 if (saw_general_regs
)
5546 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5547 struct regcache
*regcache
)
5549 struct regset_info
*regset
;
5550 int saw_general_regs
= 0;
5554 pid
= lwpid_of (current_thread
);
5555 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5560 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5561 || regset
->fill_function
== NULL
)
5564 buf
= xmalloc (regset
->size
);
5566 /* First fill the buffer with the current register set contents,
5567 in case there are any items in the kernel's regset that are
5568 not in gdbserver's regcache. */
5570 nt_type
= regset
->nt_type
;
5574 iov
.iov_len
= regset
->size
;
5575 data
= (void *) &iov
;
5581 res
= ptrace (regset
->get_request
, pid
,
5582 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5584 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5589 /* Then overlay our cached registers on that. */
5590 regset
->fill_function (regcache
, buf
);
5592 /* Only now do we write the register set. */
5594 res
= ptrace (regset
->set_request
, pid
,
5595 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5597 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5605 /* If we get EIO on a regset, do not try it again for
5606 this process mode. */
5607 disable_regset (regsets_info
, regset
);
5609 else if (errno
== ESRCH
)
5611 /* At this point, ESRCH should mean the process is
5612 already gone, in which case we simply ignore attempts
5613 to change its registers. See also the related
5614 comment in linux_resume_one_lwp. */
5620 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5623 else if (regset
->type
== GENERAL_REGS
)
5624 saw_general_regs
= 1;
5627 if (saw_general_regs
)
5633 #else /* !HAVE_LINUX_REGSETS */
5635 #define use_linux_regsets 0
5636 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5637 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5641 /* Return 1 if register REGNO is supported by one of the regset ptrace
5642 calls or 0 if it has to be transferred individually. */
5645 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5647 unsigned char mask
= 1 << (regno
% 8);
5648 size_t index
= regno
/ 8;
5650 return (use_linux_regsets
5651 && (regs_info
->regset_bitmap
== NULL
5652 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5655 #ifdef HAVE_LINUX_USRREGS
5658 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5662 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5663 error ("Invalid register number %d.", regnum
);
5665 addr
= usrregs
->regmap
[regnum
];
5670 /* Fetch one register. */
5672 fetch_register (const struct usrregs_info
*usrregs
,
5673 struct regcache
*regcache
, int regno
)
5680 if (regno
>= usrregs
->num_regs
)
5682 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5685 regaddr
= register_addr (usrregs
, regno
);
5689 size
= ((register_size (regcache
->tdesc
, regno
)
5690 + sizeof (PTRACE_XFER_TYPE
) - 1)
5691 & -sizeof (PTRACE_XFER_TYPE
));
5692 buf
= (char *) alloca (size
);
5694 pid
= lwpid_of (current_thread
);
5695 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5698 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5699 ptrace (PTRACE_PEEKUSER
, pid
,
5700 /* Coerce to a uintptr_t first to avoid potential gcc warning
5701 of coercing an 8 byte integer to a 4 byte pointer. */
5702 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5703 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5705 error ("reading register %d: %s", regno
, strerror (errno
));
5708 if (the_low_target
.supply_ptrace_register
)
5709 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5711 supply_register (regcache
, regno
, buf
);
5714 /* Store one register. */
5716 store_register (const struct usrregs_info
*usrregs
,
5717 struct regcache
*regcache
, int regno
)
5724 if (regno
>= usrregs
->num_regs
)
5726 if ((*the_low_target
.cannot_store_register
) (regno
))
5729 regaddr
= register_addr (usrregs
, regno
);
5733 size
= ((register_size (regcache
->tdesc
, regno
)
5734 + sizeof (PTRACE_XFER_TYPE
) - 1)
5735 & -sizeof (PTRACE_XFER_TYPE
));
5736 buf
= (char *) alloca (size
);
5737 memset (buf
, 0, size
);
5739 if (the_low_target
.collect_ptrace_register
)
5740 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5742 collect_register (regcache
, regno
, buf
);
5744 pid
= lwpid_of (current_thread
);
5745 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5748 ptrace (PTRACE_POKEUSER
, pid
,
5749 /* Coerce to a uintptr_t first to avoid potential gcc warning
5750 about coercing an 8 byte integer to a 4 byte pointer. */
5751 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5752 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5755 /* At this point, ESRCH should mean the process is
5756 already gone, in which case we simply ignore attempts
5757 to change its registers. See also the related
5758 comment in linux_resume_one_lwp. */
5762 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5763 error ("writing register %d: %s", regno
, strerror (errno
));
5765 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5769 /* Fetch all registers, or just one, from the child process.
5770 If REGNO is -1, do this for all registers, skipping any that are
5771 assumed to have been retrieved by regsets_fetch_inferior_registers,
5772 unless ALL is non-zero.
5773 Otherwise, REGNO specifies which register (so we can save time). */
5775 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5776 struct regcache
*regcache
, int regno
, int all
)
5778 struct usrregs_info
*usr
= regs_info
->usrregs
;
5782 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5783 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5784 fetch_register (usr
, regcache
, regno
);
5787 fetch_register (usr
, regcache
, regno
);
5790 /* Store our register values back into the inferior.
5791 If REGNO is -1, do this for all registers, skipping any that are
5792 assumed to have been saved by regsets_store_inferior_registers,
5793 unless ALL is non-zero.
5794 Otherwise, REGNO specifies which register (so we can save time). */
5796 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5797 struct regcache
*regcache
, int regno
, int all
)
5799 struct usrregs_info
*usr
= regs_info
->usrregs
;
5803 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5804 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5805 store_register (usr
, regcache
, regno
);
5808 store_register (usr
, regcache
, regno
);
5811 #else /* !HAVE_LINUX_USRREGS */
5813 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5814 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5820 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5824 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5828 if (the_low_target
.fetch_register
!= NULL
5829 && regs_info
->usrregs
!= NULL
)
5830 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5831 (*the_low_target
.fetch_register
) (regcache
, regno
);
5833 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5834 if (regs_info
->usrregs
!= NULL
)
5835 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5839 if (the_low_target
.fetch_register
!= NULL
5840 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5843 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5845 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5847 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5848 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5853 linux_store_registers (struct regcache
*regcache
, int regno
)
5857 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5861 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5863 if (regs_info
->usrregs
!= NULL
)
5864 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5868 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5870 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5872 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5873 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5878 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5879 to debugger memory starting at MYADDR. */
5882 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5884 int pid
= lwpid_of (current_thread
);
5885 PTRACE_XFER_TYPE
*buffer
;
5893 /* Try using /proc. Don't bother for one word. */
5894 if (len
>= 3 * sizeof (long))
5898 /* We could keep this file open and cache it - possibly one per
5899 thread. That requires some juggling, but is even faster. */
5900 sprintf (filename
, "/proc/%d/mem", pid
);
5901 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5905 /* If pread64 is available, use it. It's faster if the kernel
5906 supports it (only one syscall), and it's 64-bit safe even on
5907 32-bit platforms (for instance, SPARC debugging a SPARC64
5910 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5913 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5914 bytes
= read (fd
, myaddr
, len
);
5921 /* Some data was read, we'll try to get the rest with ptrace. */
5931 /* Round starting address down to longword boundary. */
5932 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5933 /* Round ending address up; get number of longwords that makes. */
5934 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5935 / sizeof (PTRACE_XFER_TYPE
));
5936 /* Allocate buffer of that many longwords. */
5937 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5939 /* Read all the longwords */
5941 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5943 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5944 about coercing an 8 byte integer to a 4 byte pointer. */
5945 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5946 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5947 (PTRACE_TYPE_ARG4
) 0);
5953 /* Copy appropriate bytes out of the buffer. */
5956 i
*= sizeof (PTRACE_XFER_TYPE
);
5957 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5959 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5966 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5967 memory at MEMADDR. On failure (cannot write to the inferior)
5968 returns the value of errno. Always succeeds if LEN is zero. */
5971 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5974 /* Round starting address down to longword boundary. */
5975 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5976 /* Round ending address up; get number of longwords that makes. */
5978 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5979 / sizeof (PTRACE_XFER_TYPE
);
5981 /* Allocate buffer of that many longwords. */
5982 PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5984 int pid
= lwpid_of (current_thread
);
5988 /* Zero length write always succeeds. */
5994 /* Dump up to four bytes. */
5995 char str
[4 * 2 + 1];
5997 int dump
= len
< 4 ? len
: 4;
5999 for (i
= 0; i
< dump
; i
++)
6001 sprintf (p
, "%02x", myaddr
[i
]);
6006 debug_printf ("Writing %s to 0x%08lx in process %d\n",
6007 str
, (long) memaddr
, pid
);
6010 /* Fill start and end extra bytes of buffer with existing memory data. */
6013 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
6014 about coercing an 8 byte integer to a 4 byte pointer. */
6015 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
6016 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
6017 (PTRACE_TYPE_ARG4
) 0);
6025 = ptrace (PTRACE_PEEKTEXT
, pid
,
6026 /* Coerce to a uintptr_t first to avoid potential gcc warning
6027 about coercing an 8 byte integer to a 4 byte pointer. */
6028 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
6029 * sizeof (PTRACE_XFER_TYPE
)),
6030 (PTRACE_TYPE_ARG4
) 0);
6035 /* Copy data to be written over corresponding part of buffer. */
6037 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
6040 /* Write the entire buffer. */
6042 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
6045 ptrace (PTRACE_POKETEXT
, pid
,
6046 /* Coerce to a uintptr_t first to avoid potential gcc warning
6047 about coercing an 8 byte integer to a 4 byte pointer. */
6048 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
6049 (PTRACE_TYPE_ARG4
) buffer
[i
]);
6058 linux_look_up_symbols (void)
6060 #ifdef USE_THREAD_DB
6061 struct process_info
*proc
= current_process ();
6063 if (proc
->priv
->thread_db
!= NULL
)
6071 linux_request_interrupt (void)
6073 /* Send a SIGINT to the process group. This acts just like the user
6074 typed a ^C on the controlling terminal. */
6075 kill (-signal_pid
, SIGINT
);
6078 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
6079 to debugger memory starting at MYADDR. */
6082 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
6084 char filename
[PATH_MAX
];
6086 int pid
= lwpid_of (current_thread
);
6088 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6090 fd
= open (filename
, O_RDONLY
);
6094 if (offset
!= (CORE_ADDR
) 0
6095 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6098 n
= read (fd
, myaddr
, len
);
6105 /* These breakpoint and watchpoint related wrapper functions simply
6106 pass on the function call if the target has registered a
6107 corresponding function. */
6110 linux_supports_z_point_type (char z_type
)
6112 return (the_low_target
.supports_z_point_type
!= NULL
6113 && the_low_target
.supports_z_point_type (z_type
));
6117 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6118 int size
, struct raw_breakpoint
*bp
)
6120 if (type
== raw_bkpt_type_sw
)
6121 return insert_memory_breakpoint (bp
);
6122 else if (the_low_target
.insert_point
!= NULL
)
6123 return the_low_target
.insert_point (type
, addr
, size
, bp
);
6125 /* Unsupported (see target.h). */
6130 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6131 int size
, struct raw_breakpoint
*bp
)
6133 if (type
== raw_bkpt_type_sw
)
6134 return remove_memory_breakpoint (bp
);
6135 else if (the_low_target
.remove_point
!= NULL
)
6136 return the_low_target
.remove_point (type
, addr
, size
, bp
);
6138 /* Unsupported (see target.h). */
6142 /* Implement the to_stopped_by_sw_breakpoint target_ops
6146 linux_stopped_by_sw_breakpoint (void)
6148 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6150 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
6153 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
6157 linux_supports_stopped_by_sw_breakpoint (void)
6159 return USE_SIGTRAP_SIGINFO
;
6162 /* Implement the to_stopped_by_hw_breakpoint target_ops
6166 linux_stopped_by_hw_breakpoint (void)
6168 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6170 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6173 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6177 linux_supports_stopped_by_hw_breakpoint (void)
6179 return USE_SIGTRAP_SIGINFO
;
6182 /* Implement the supports_hardware_single_step target_ops method. */
6185 linux_supports_hardware_single_step (void)
6187 return can_hardware_single_step ();
6191 linux_supports_software_single_step (void)
6193 return can_software_single_step ();
6197 linux_stopped_by_watchpoint (void)
6199 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6201 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6205 linux_stopped_data_address (void)
6207 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6209 return lwp
->stopped_data_address
;
6212 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6213 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6214 && defined(PT_TEXT_END_ADDR)
6216 /* This is only used for targets that define PT_TEXT_ADDR,
6217 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6218 the target has different ways of acquiring this information, like
6221 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6222 to tell gdb about. */
6225 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6227 unsigned long text
, text_end
, data
;
6228 int pid
= lwpid_of (current_thread
);
6232 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6233 (PTRACE_TYPE_ARG4
) 0);
6234 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6235 (PTRACE_TYPE_ARG4
) 0);
6236 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6237 (PTRACE_TYPE_ARG4
) 0);
6241 /* Both text and data offsets produced at compile-time (and so
6242 used by gdb) are relative to the beginning of the program,
6243 with the data segment immediately following the text segment.
6244 However, the actual runtime layout in memory may put the data
6245 somewhere else, so when we send gdb a data base-address, we
6246 use the real data base address and subtract the compile-time
6247 data base-address from it (which is just the length of the
6248 text segment). BSS immediately follows data in both
6251 *data_p
= data
- (text_end
- text
);
6260 linux_qxfer_osdata (const char *annex
,
6261 unsigned char *readbuf
, unsigned const char *writebuf
,
6262 CORE_ADDR offset
, int len
)
6264 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6267 /* Convert a native/host siginfo object, into/from the siginfo in the
6268 layout of the inferiors' architecture. */
6271 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6275 if (the_low_target
.siginfo_fixup
!= NULL
)
6276 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6278 /* If there was no callback, or the callback didn't do anything,
6279 then just do a straight memcpy. */
6283 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6285 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6290 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6291 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6295 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6297 if (current_thread
== NULL
)
6300 pid
= lwpid_of (current_thread
);
6303 debug_printf ("%s siginfo for lwp %d.\n",
6304 readbuf
!= NULL
? "Reading" : "Writing",
6307 if (offset
>= sizeof (siginfo
))
6310 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6313 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6314 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6315 inferior with a 64-bit GDBSERVER should look the same as debugging it
6316 with a 32-bit GDBSERVER, we need to convert it. */
6317 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6319 if (offset
+ len
> sizeof (siginfo
))
6320 len
= sizeof (siginfo
) - offset
;
6322 if (readbuf
!= NULL
)
6323 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6326 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6328 /* Convert back to ptrace layout before flushing it out. */
6329 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6331 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6338 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6339 so we notice when children change state; as the handler for the
6340 sigsuspend in my_waitpid. */
6343 sigchld_handler (int signo
)
6345 int old_errno
= errno
;
6351 /* fprintf is not async-signal-safe, so call write
6353 if (write (2, "sigchld_handler\n",
6354 sizeof ("sigchld_handler\n") - 1) < 0)
6355 break; /* just ignore */
6359 if (target_is_async_p ())
6360 async_file_mark (); /* trigger a linux_wait */
6366 linux_supports_non_stop (void)
6372 linux_async (int enable
)
6374 int previous
= target_is_async_p ();
6377 debug_printf ("linux_async (%d), previous=%d\n",
6380 if (previous
!= enable
)
6383 sigemptyset (&mask
);
6384 sigaddset (&mask
, SIGCHLD
);
6386 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6390 if (pipe (linux_event_pipe
) == -1)
6392 linux_event_pipe
[0] = -1;
6393 linux_event_pipe
[1] = -1;
6394 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6396 warning ("creating event pipe failed.");
6400 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6401 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6403 /* Register the event loop handler. */
6404 add_file_handler (linux_event_pipe
[0],
6405 handle_target_event
, NULL
);
6407 /* Always trigger a linux_wait. */
6412 delete_file_handler (linux_event_pipe
[0]);
6414 close (linux_event_pipe
[0]);
6415 close (linux_event_pipe
[1]);
6416 linux_event_pipe
[0] = -1;
6417 linux_event_pipe
[1] = -1;
6420 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6427 linux_start_non_stop (int nonstop
)
6429 /* Register or unregister from event-loop accordingly. */
6430 linux_async (nonstop
);
6432 if (target_is_async_p () != (nonstop
!= 0))
6439 linux_supports_multi_process (void)
6444 /* Check if fork events are supported. */
6447 linux_supports_fork_events (void)
6449 return linux_supports_tracefork ();
6452 /* Check if vfork events are supported. */
6455 linux_supports_vfork_events (void)
6457 return linux_supports_tracefork ();
6460 /* Check if exec events are supported. */
6463 linux_supports_exec_events (void)
6465 return linux_supports_traceexec ();
6468 /* Callback for 'find_inferior'. Set the (possibly changed) ptrace
6469 options for the specified lwp. */
6472 reset_lwp_ptrace_options_callback (struct inferior_list_entry
*entry
,
6475 struct thread_info
*thread
= (struct thread_info
*) entry
;
6476 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6480 /* Stop the lwp so we can modify its ptrace options. */
6481 lwp
->must_set_ptrace_flags
= 1;
6482 linux_stop_lwp (lwp
);
6486 /* Already stopped; go ahead and set the ptrace options. */
6487 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6488 int options
= linux_low_ptrace_options (proc
->attached
);
6490 linux_enable_event_reporting (lwpid_of (thread
), options
);
6491 lwp
->must_set_ptrace_flags
= 0;
6497 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6498 ptrace flags for all inferiors. This is in case the new GDB connection
6499 doesn't support the same set of events that the previous one did. */
6502 linux_handle_new_gdb_connection (void)
6506 /* Request that all the lwps reset their ptrace options. */
6507 find_inferior (&all_threads
, reset_lwp_ptrace_options_callback
, &pid
);
6511 linux_supports_disable_randomization (void)
6513 #ifdef HAVE_PERSONALITY
6521 linux_supports_agent (void)
6527 linux_supports_range_stepping (void)
6529 if (can_software_single_step ())
6531 if (*the_low_target
.supports_range_stepping
== NULL
)
6534 return (*the_low_target
.supports_range_stepping
) ();
6537 /* Enumerate spufs IDs for process PID. */
6539 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6545 struct dirent
*entry
;
6547 sprintf (path
, "/proc/%ld/fd", pid
);
6548 dir
= opendir (path
);
6553 while ((entry
= readdir (dir
)) != NULL
)
6559 fd
= atoi (entry
->d_name
);
6563 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6564 if (stat (path
, &st
) != 0)
6566 if (!S_ISDIR (st
.st_mode
))
6569 if (statfs (path
, &stfs
) != 0)
6571 if (stfs
.f_type
!= SPUFS_MAGIC
)
6574 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6576 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6586 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6587 object type, using the /proc file system. */
6589 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6590 unsigned const char *writebuf
,
6591 CORE_ADDR offset
, int len
)
6593 long pid
= lwpid_of (current_thread
);
6598 if (!writebuf
&& !readbuf
)
6606 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6609 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6610 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6615 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6622 ret
= write (fd
, writebuf
, (size_t) len
);
6624 ret
= read (fd
, readbuf
, (size_t) len
);
6630 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6631 struct target_loadseg
6633 /* Core address to which the segment is mapped. */
6635 /* VMA recorded in the program header. */
6637 /* Size of this segment in memory. */
6641 # if defined PT_GETDSBT
6642 struct target_loadmap
6644 /* Protocol version number, must be zero. */
6646 /* Pointer to the DSBT table, its size, and the DSBT index. */
6647 unsigned *dsbt_table
;
6648 unsigned dsbt_size
, dsbt_index
;
6649 /* Number of segments in this map. */
6651 /* The actual memory map. */
6652 struct target_loadseg segs
[/*nsegs*/];
6654 # define LINUX_LOADMAP PT_GETDSBT
6655 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6656 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6658 struct target_loadmap
6660 /* Protocol version number, must be zero. */
6662 /* Number of segments in this map. */
6664 /* The actual memory map. */
6665 struct target_loadseg segs
[/*nsegs*/];
6667 # define LINUX_LOADMAP PTRACE_GETFDPIC
6668 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6669 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6673 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6674 unsigned char *myaddr
, unsigned int len
)
6676 int pid
= lwpid_of (current_thread
);
6678 struct target_loadmap
*data
= NULL
;
6679 unsigned int actual_length
, copy_length
;
6681 if (strcmp (annex
, "exec") == 0)
6682 addr
= (int) LINUX_LOADMAP_EXEC
;
6683 else if (strcmp (annex
, "interp") == 0)
6684 addr
= (int) LINUX_LOADMAP_INTERP
;
6688 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6694 actual_length
= sizeof (struct target_loadmap
)
6695 + sizeof (struct target_loadseg
) * data
->nsegs
;
6697 if (offset
< 0 || offset
> actual_length
)
6700 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6701 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6705 # define linux_read_loadmap NULL
6706 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6709 linux_process_qsupported (char **features
, int count
)
6711 if (the_low_target
.process_qsupported
!= NULL
)
6712 the_low_target
.process_qsupported (features
, count
);
6716 linux_supports_catch_syscall (void)
6718 return (the_low_target
.get_syscall_trapinfo
!= NULL
6719 && linux_supports_tracesysgood ());
6723 linux_get_ipa_tdesc_idx (void)
6725 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6728 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6732 linux_supports_tracepoints (void)
6734 if (*the_low_target
.supports_tracepoints
== NULL
)
6737 return (*the_low_target
.supports_tracepoints
) ();
6741 linux_read_pc (struct regcache
*regcache
)
6743 if (the_low_target
.get_pc
== NULL
)
6746 return (*the_low_target
.get_pc
) (regcache
);
6750 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6752 gdb_assert (the_low_target
.set_pc
!= NULL
);
6754 (*the_low_target
.set_pc
) (regcache
, pc
);
6758 linux_thread_stopped (struct thread_info
*thread
)
6760 return get_thread_lwp (thread
)->stopped
;
6763 /* This exposes stop-all-threads functionality to other modules. */
6766 linux_pause_all (int freeze
)
6768 stop_all_lwps (freeze
, NULL
);
6771 /* This exposes unstop-all-threads functionality to other gdbserver
6775 linux_unpause_all (int unfreeze
)
6777 unstop_all_lwps (unfreeze
, NULL
);
6781 linux_prepare_to_access_memory (void)
6783 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6786 linux_pause_all (1);
6791 linux_done_accessing_memory (void)
6793 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6796 linux_unpause_all (1);
6800 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6801 CORE_ADDR collector
,
6804 CORE_ADDR
*jump_entry
,
6805 CORE_ADDR
*trampoline
,
6806 ULONGEST
*trampoline_size
,
6807 unsigned char *jjump_pad_insn
,
6808 ULONGEST
*jjump_pad_insn_size
,
6809 CORE_ADDR
*adjusted_insn_addr
,
6810 CORE_ADDR
*adjusted_insn_addr_end
,
6813 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6814 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6815 jump_entry
, trampoline
, trampoline_size
,
6816 jjump_pad_insn
, jjump_pad_insn_size
,
6817 adjusted_insn_addr
, adjusted_insn_addr_end
,
6821 static struct emit_ops
*
6822 linux_emit_ops (void)
6824 if (the_low_target
.emit_ops
!= NULL
)
6825 return (*the_low_target
.emit_ops
) ();
6831 linux_get_min_fast_tracepoint_insn_len (void)
6833 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6836 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6839 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6840 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6842 char filename
[PATH_MAX
];
6844 const int auxv_size
= is_elf64
6845 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6846 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6848 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6850 fd
= open (filename
, O_RDONLY
);
6856 while (read (fd
, buf
, auxv_size
) == auxv_size
6857 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6861 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6863 switch (aux
->a_type
)
6866 *phdr_memaddr
= aux
->a_un
.a_val
;
6869 *num_phdr
= aux
->a_un
.a_val
;
6875 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6877 switch (aux
->a_type
)
6880 *phdr_memaddr
= aux
->a_un
.a_val
;
6883 *num_phdr
= aux
->a_un
.a_val
;
6891 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6893 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6894 "phdr_memaddr = %ld, phdr_num = %d",
6895 (long) *phdr_memaddr
, *num_phdr
);
6902 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6905 get_dynamic (const int pid
, const int is_elf64
)
6907 CORE_ADDR phdr_memaddr
, relocation
;
6909 unsigned char *phdr_buf
;
6910 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6912 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6915 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6916 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6918 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6921 /* Compute relocation: it is expected to be 0 for "regular" executables,
6922 non-zero for PIE ones. */
6924 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6927 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6929 if (p
->p_type
== PT_PHDR
)
6930 relocation
= phdr_memaddr
- p
->p_vaddr
;
6934 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6936 if (p
->p_type
== PT_PHDR
)
6937 relocation
= phdr_memaddr
- p
->p_vaddr
;
6940 if (relocation
== -1)
6942 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6943 any real world executables, including PIE executables, have always
6944 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6945 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6946 or present DT_DEBUG anyway (fpc binaries are statically linked).
6948 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6950 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6955 for (i
= 0; i
< num_phdr
; i
++)
6959 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6961 if (p
->p_type
== PT_DYNAMIC
)
6962 return p
->p_vaddr
+ relocation
;
6966 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6968 if (p
->p_type
== PT_DYNAMIC
)
6969 return p
->p_vaddr
+ relocation
;
6976 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6977 can be 0 if the inferior does not yet have the library list initialized.
6978 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6979 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6982 get_r_debug (const int pid
, const int is_elf64
)
6984 CORE_ADDR dynamic_memaddr
;
6985 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6986 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6989 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6990 if (dynamic_memaddr
== 0)
6993 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6997 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6998 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
7002 unsigned char buf
[sizeof (Elf64_Xword
)];
7006 #ifdef DT_MIPS_RLD_MAP
7007 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
7009 if (linux_read_memory (dyn
->d_un
.d_val
,
7010 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7015 #endif /* DT_MIPS_RLD_MAP */
7016 #ifdef DT_MIPS_RLD_MAP_REL
7017 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
7019 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
7020 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7025 #endif /* DT_MIPS_RLD_MAP_REL */
7027 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
7028 map
= dyn
->d_un
.d_val
;
7030 if (dyn
->d_tag
== DT_NULL
)
7035 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
7036 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
7040 unsigned char buf
[sizeof (Elf32_Word
)];
7044 #ifdef DT_MIPS_RLD_MAP
7045 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
7047 if (linux_read_memory (dyn
->d_un
.d_val
,
7048 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7053 #endif /* DT_MIPS_RLD_MAP */
7054 #ifdef DT_MIPS_RLD_MAP_REL
7055 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
7057 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
7058 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7063 #endif /* DT_MIPS_RLD_MAP_REL */
7065 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
7066 map
= dyn
->d_un
.d_val
;
7068 if (dyn
->d_tag
== DT_NULL
)
7072 dynamic_memaddr
+= dyn_size
;
7078 /* Read one pointer from MEMADDR in the inferior. */
7081 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
7085 /* Go through a union so this works on either big or little endian
7086 hosts, when the inferior's pointer size is smaller than the size
7087 of CORE_ADDR. It is assumed the inferior's endianness is the
7088 same of the superior's. */
7091 CORE_ADDR core_addr
;
7096 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
7099 if (ptr_size
== sizeof (CORE_ADDR
))
7100 *ptr
= addr
.core_addr
;
7101 else if (ptr_size
== sizeof (unsigned int))
7104 gdb_assert_not_reached ("unhandled pointer size");
7109 struct link_map_offsets
7111 /* Offset and size of r_debug.r_version. */
7112 int r_version_offset
;
7114 /* Offset and size of r_debug.r_map. */
7117 /* Offset to l_addr field in struct link_map. */
7120 /* Offset to l_name field in struct link_map. */
7123 /* Offset to l_ld field in struct link_map. */
7126 /* Offset to l_next field in struct link_map. */
7129 /* Offset to l_prev field in struct link_map. */
7133 /* Construct qXfer:libraries-svr4:read reply. */
7136 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
7137 unsigned const char *writebuf
,
7138 CORE_ADDR offset
, int len
)
7141 unsigned document_len
;
7142 struct process_info_private
*const priv
= current_process ()->priv
;
7143 char filename
[PATH_MAX
];
7146 static const struct link_map_offsets lmo_32bit_offsets
=
7148 0, /* r_version offset. */
7149 4, /* r_debug.r_map offset. */
7150 0, /* l_addr offset in link_map. */
7151 4, /* l_name offset in link_map. */
7152 8, /* l_ld offset in link_map. */
7153 12, /* l_next offset in link_map. */
7154 16 /* l_prev offset in link_map. */
7157 static const struct link_map_offsets lmo_64bit_offsets
=
7159 0, /* r_version offset. */
7160 8, /* r_debug.r_map offset. */
7161 0, /* l_addr offset in link_map. */
7162 8, /* l_name offset in link_map. */
7163 16, /* l_ld offset in link_map. */
7164 24, /* l_next offset in link_map. */
7165 32 /* l_prev offset in link_map. */
7167 const struct link_map_offsets
*lmo
;
7168 unsigned int machine
;
7170 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7171 int allocated
= 1024;
7173 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7174 int header_done
= 0;
7176 if (writebuf
!= NULL
)
7178 if (readbuf
== NULL
)
7181 pid
= lwpid_of (current_thread
);
7182 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7183 is_elf64
= elf_64_file_p (filename
, &machine
);
7184 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7185 ptr_size
= is_elf64
? 8 : 4;
7187 while (annex
[0] != '\0')
7193 sep
= strchr (annex
, '=');
7198 if (len
== 5 && startswith (annex
, "start"))
7200 else if (len
== 4 && startswith (annex
, "prev"))
7204 annex
= strchr (sep
, ';');
7211 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7218 if (priv
->r_debug
== 0)
7219 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7221 /* We failed to find DT_DEBUG. Such situation will not change
7222 for this inferior - do not retry it. Report it to GDB as
7223 E01, see for the reasons at the GDB solib-svr4.c side. */
7224 if (priv
->r_debug
== (CORE_ADDR
) -1)
7227 if (priv
->r_debug
!= 0)
7229 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7230 (unsigned char *) &r_version
,
7231 sizeof (r_version
)) != 0
7234 warning ("unexpected r_debug version %d", r_version
);
7236 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7237 &lm_addr
, ptr_size
) != 0)
7239 warning ("unable to read r_map from 0x%lx",
7240 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7245 document
= (char *) xmalloc (allocated
);
7246 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7247 p
= document
+ strlen (document
);
7250 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7251 &l_name
, ptr_size
) == 0
7252 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7253 &l_addr
, ptr_size
) == 0
7254 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7255 &l_ld
, ptr_size
) == 0
7256 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7257 &l_prev
, ptr_size
) == 0
7258 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7259 &l_next
, ptr_size
) == 0)
7261 unsigned char libname
[PATH_MAX
];
7263 if (lm_prev
!= l_prev
)
7265 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7266 (long) lm_prev
, (long) l_prev
);
7270 /* Ignore the first entry even if it has valid name as the first entry
7271 corresponds to the main executable. The first entry should not be
7272 skipped if the dynamic loader was loaded late by a static executable
7273 (see solib-svr4.c parameter ignore_first). But in such case the main
7274 executable does not have PT_DYNAMIC present and this function already
7275 exited above due to failed get_r_debug. */
7278 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7283 /* Not checking for error because reading may stop before
7284 we've got PATH_MAX worth of characters. */
7286 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7287 libname
[sizeof (libname
) - 1] = '\0';
7288 if (libname
[0] != '\0')
7290 /* 6x the size for xml_escape_text below. */
7291 size_t len
= 6 * strlen ((char *) libname
);
7296 /* Terminate `<library-list-svr4'. */
7301 while (allocated
< p
- document
+ len
+ 200)
7303 /* Expand to guarantee sufficient storage. */
7304 uintptr_t document_len
= p
- document
;
7306 document
= (char *) xrealloc (document
, 2 * allocated
);
7308 p
= document
+ document_len
;
7311 name
= xml_escape_text ((char *) libname
);
7312 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7313 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7314 name
, (unsigned long) lm_addr
,
7315 (unsigned long) l_addr
, (unsigned long) l_ld
);
7326 /* Empty list; terminate `<library-list-svr4'. */
7330 strcpy (p
, "</library-list-svr4>");
7332 document_len
= strlen (document
);
7333 if (offset
< document_len
)
7334 document_len
-= offset
;
7337 if (len
> document_len
)
7340 memcpy (readbuf
, document
+ offset
, len
);
7346 #ifdef HAVE_LINUX_BTRACE
7348 /* See to_disable_btrace target method. */
7351 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7353 enum btrace_error err
;
7355 err
= linux_disable_btrace (tinfo
);
7356 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7359 /* Encode an Intel Processor Trace configuration. */
7362 linux_low_encode_pt_config (struct buffer
*buffer
,
7363 const struct btrace_data_pt_config
*config
)
7365 buffer_grow_str (buffer
, "<pt-config>\n");
7367 switch (config
->cpu
.vendor
)
7370 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7371 "model=\"%u\" stepping=\"%u\"/>\n",
7372 config
->cpu
.family
, config
->cpu
.model
,
7373 config
->cpu
.stepping
);
7380 buffer_grow_str (buffer
, "</pt-config>\n");
7383 /* Encode a raw buffer. */
7386 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7392 /* We use hex encoding - see common/rsp-low.h. */
7393 buffer_grow_str (buffer
, "<raw>\n");
7399 elem
[0] = tohex ((*data
>> 4) & 0xf);
7400 elem
[1] = tohex (*data
++ & 0xf);
7402 buffer_grow (buffer
, elem
, 2);
7405 buffer_grow_str (buffer
, "</raw>\n");
7408 /* See to_read_btrace target method. */
7411 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7412 enum btrace_read_type type
)
7414 struct btrace_data btrace
;
7415 struct btrace_block
*block
;
7416 enum btrace_error err
;
7419 btrace_data_init (&btrace
);
7421 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7422 if (err
!= BTRACE_ERR_NONE
)
7424 if (err
== BTRACE_ERR_OVERFLOW
)
7425 buffer_grow_str0 (buffer
, "E.Overflow.");
7427 buffer_grow_str0 (buffer
, "E.Generic Error.");
7432 switch (btrace
.format
)
7434 case BTRACE_FORMAT_NONE
:
7435 buffer_grow_str0 (buffer
, "E.No Trace.");
7438 case BTRACE_FORMAT_BTS
:
7439 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7440 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7443 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7445 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7446 paddress (block
->begin
), paddress (block
->end
));
7448 buffer_grow_str0 (buffer
, "</btrace>\n");
7451 case BTRACE_FORMAT_PT
:
7452 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7453 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7454 buffer_grow_str (buffer
, "<pt>\n");
7456 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7458 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7459 btrace
.variant
.pt
.size
);
7461 buffer_grow_str (buffer
, "</pt>\n");
7462 buffer_grow_str0 (buffer
, "</btrace>\n");
7466 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7470 btrace_data_fini (&btrace
);
7474 btrace_data_fini (&btrace
);
7478 /* See to_btrace_conf target method. */
7481 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7482 struct buffer
*buffer
)
7484 const struct btrace_config
*conf
;
7486 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7487 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7489 conf
= linux_btrace_conf (tinfo
);
7492 switch (conf
->format
)
7494 case BTRACE_FORMAT_NONE
:
7497 case BTRACE_FORMAT_BTS
:
7498 buffer_xml_printf (buffer
, "<bts");
7499 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7500 buffer_xml_printf (buffer
, " />\n");
7503 case BTRACE_FORMAT_PT
:
7504 buffer_xml_printf (buffer
, "<pt");
7505 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7506 buffer_xml_printf (buffer
, "/>\n");
7511 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7514 #endif /* HAVE_LINUX_BTRACE */
7516 /* See nat/linux-nat.h. */
7519 current_lwp_ptid (void)
7521 return ptid_of (current_thread
);
7524 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7527 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7529 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7530 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7532 return default_breakpoint_kind_from_pc (pcptr
);
7535 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7537 static const gdb_byte
*
7538 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7540 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7542 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7545 /* Implementation of the target_ops method
7546 "breakpoint_kind_from_current_state". */
7549 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7551 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7552 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7554 return linux_breakpoint_kind_from_pc (pcptr
);
7557 /* Default implementation of linux_target_ops method "set_pc" for
7558 32-bit pc register which is literally named "pc". */
7561 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7563 uint32_t newpc
= pc
;
7565 supply_register_by_name (regcache
, "pc", &newpc
);
7568 /* Default implementation of linux_target_ops method "get_pc" for
7569 32-bit pc register which is literally named "pc". */
7572 linux_get_pc_32bit (struct regcache
*regcache
)
7576 collect_register_by_name (regcache
, "pc", &pc
);
7578 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7582 /* Default implementation of linux_target_ops method "set_pc" for
7583 64-bit pc register which is literally named "pc". */
7586 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7588 uint64_t newpc
= pc
;
7590 supply_register_by_name (regcache
, "pc", &newpc
);
7593 /* Default implementation of linux_target_ops method "get_pc" for
7594 64-bit pc register which is literally named "pc". */
7597 linux_get_pc_64bit (struct regcache
*regcache
)
7601 collect_register_by_name (regcache
, "pc", &pc
);
7603 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7608 static struct target_ops linux_target_ops
= {
7609 linux_create_inferior
,
7610 linux_post_create_inferior
,
7619 linux_fetch_registers
,
7620 linux_store_registers
,
7621 linux_prepare_to_access_memory
,
7622 linux_done_accessing_memory
,
7625 linux_look_up_symbols
,
7626 linux_request_interrupt
,
7628 linux_supports_z_point_type
,
7631 linux_stopped_by_sw_breakpoint
,
7632 linux_supports_stopped_by_sw_breakpoint
,
7633 linux_stopped_by_hw_breakpoint
,
7634 linux_supports_stopped_by_hw_breakpoint
,
7635 linux_supports_hardware_single_step
,
7636 linux_stopped_by_watchpoint
,
7637 linux_stopped_data_address
,
7638 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7639 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7640 && defined(PT_TEXT_END_ADDR)
7645 #ifdef USE_THREAD_DB
7646 thread_db_get_tls_address
,
7651 hostio_last_error_from_errno
,
7654 linux_supports_non_stop
,
7656 linux_start_non_stop
,
7657 linux_supports_multi_process
,
7658 linux_supports_fork_events
,
7659 linux_supports_vfork_events
,
7660 linux_supports_exec_events
,
7661 linux_handle_new_gdb_connection
,
7662 #ifdef USE_THREAD_DB
7663 thread_db_handle_monitor_command
,
7667 linux_common_core_of_thread
,
7669 linux_process_qsupported
,
7670 linux_supports_tracepoints
,
7673 linux_thread_stopped
,
7677 linux_stabilize_threads
,
7678 linux_install_fast_tracepoint_jump_pad
,
7680 linux_supports_disable_randomization
,
7681 linux_get_min_fast_tracepoint_insn_len
,
7682 linux_qxfer_libraries_svr4
,
7683 linux_supports_agent
,
7684 #ifdef HAVE_LINUX_BTRACE
7685 linux_supports_btrace
,
7686 linux_enable_btrace
,
7687 linux_low_disable_btrace
,
7688 linux_low_read_btrace
,
7689 linux_low_btrace_conf
,
7697 linux_supports_range_stepping
,
7698 linux_proc_pid_to_exec_file
,
7699 linux_mntns_open_cloexec
,
7701 linux_mntns_readlink
,
7702 linux_breakpoint_kind_from_pc
,
7703 linux_sw_breakpoint_from_kind
,
7704 linux_proc_tid_get_name
,
7705 linux_breakpoint_kind_from_current_state
,
7706 linux_supports_software_single_step
,
7707 linux_supports_catch_syscall
,
7708 linux_get_ipa_tdesc_idx
,
7711 #ifdef HAVE_LINUX_REGSETS
7713 initialize_regsets_info (struct regsets_info
*info
)
7715 for (info
->num_regsets
= 0;
7716 info
->regsets
[info
->num_regsets
].size
>= 0;
7717 info
->num_regsets
++)
7723 initialize_low (void)
7725 struct sigaction sigchld_action
;
7727 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7728 set_target_ops (&linux_target_ops
);
7730 linux_ptrace_init_warnings ();
7732 sigchld_action
.sa_handler
= sigchld_handler
;
7733 sigemptyset (&sigchld_action
.sa_mask
);
7734 sigchld_action
.sa_flags
= SA_RESTART
;
7735 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7737 initialize_low_arch ();
7739 linux_check_ptrace_features ();