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
= allocate_target_description ();
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 lwp_info
*rel
= lwp
->fork_relative
;
4716 if (rel
->status_pending_p
4717 && (rel
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
4718 || rel
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
))
4721 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4727 /* If the thread has a pending event that has already been
4728 reported to GDBserver core, but GDB has not pulled the
4729 event out of the vStopped queue yet, likewise, ignore the
4730 (wildcard) resume request. */
4731 if (in_queued_stop_replies (entry
->id
))
4734 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4739 lwp
->resume
= &r
->resume
[ndx
];
4740 thread
->last_resume_kind
= lwp
->resume
->kind
;
4742 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4743 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4745 /* If we had a deferred signal to report, dequeue one now.
4746 This can happen if LWP gets more than one signal while
4747 trying to get out of a jump pad. */
4749 && !lwp
->status_pending_p
4750 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4752 lwp
->status_pending_p
= 1;
4755 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4756 "leaving status pending.\n",
4757 WSTOPSIG (lwp
->status_pending
),
4765 /* No resume action for this thread. */
4771 /* find_inferior callback for linux_resume.
4772 Set *FLAG_P if this lwp has an interesting status pending. */
4775 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
4777 struct thread_info
*thread
= (struct thread_info
*) entry
;
4778 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4780 /* LWPs which will not be resumed are not interesting, because
4781 we might not wait for them next time through linux_wait. */
4782 if (lwp
->resume
== NULL
)
4785 if (thread_still_has_status_pending_p (thread
))
4786 * (int *) flag_p
= 1;
4791 /* Return 1 if this lwp that GDB wants running is stopped at an
4792 internal breakpoint that we need to step over. It assumes that any
4793 required STOP_PC adjustment has already been propagated to the
4794 inferior's regcache. */
4797 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
4799 struct thread_info
*thread
= (struct thread_info
*) entry
;
4800 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4801 struct thread_info
*saved_thread
;
4803 struct process_info
*proc
= get_thread_process (thread
);
4805 /* GDBserver is skipping the extra traps from the wrapper program,
4806 don't have to do step over. */
4807 if (proc
->tdesc
== NULL
)
4810 /* LWPs which will not be resumed are not interesting, because we
4811 might not wait for them next time through linux_wait. */
4816 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4821 if (thread
->last_resume_kind
== resume_stop
)
4824 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4830 gdb_assert (lwp
->suspended
>= 0);
4835 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4840 if (lwp
->status_pending_p
)
4843 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4849 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4853 /* If the PC has changed since we stopped, then don't do anything,
4854 and let the breakpoint/tracepoint be hit. This happens if, for
4855 instance, GDB handled the decr_pc_after_break subtraction itself,
4856 GDB is OOL stepping this thread, or the user has issued a "jump"
4857 command, or poked thread's registers herself. */
4858 if (pc
!= lwp
->stop_pc
)
4861 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4862 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4864 paddress (lwp
->stop_pc
), paddress (pc
));
4868 /* On software single step target, resume the inferior with signal
4869 rather than stepping over. */
4870 if (can_software_single_step ()
4871 && lwp
->pending_signals
!= NULL
4872 && lwp_signal_can_be_delivered (lwp
))
4875 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4882 saved_thread
= current_thread
;
4883 current_thread
= thread
;
4885 /* We can only step over breakpoints we know about. */
4886 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4888 /* Don't step over a breakpoint that GDB expects to hit
4889 though. If the condition is being evaluated on the target's side
4890 and it evaluate to false, step over this breakpoint as well. */
4891 if (gdb_breakpoint_here (pc
)
4892 && gdb_condition_true_at_breakpoint (pc
)
4893 && gdb_no_commands_at_breakpoint (pc
))
4896 debug_printf ("Need step over [LWP %ld]? yes, but found"
4897 " GDB breakpoint at 0x%s; skipping step over\n",
4898 lwpid_of (thread
), paddress (pc
));
4900 current_thread
= saved_thread
;
4906 debug_printf ("Need step over [LWP %ld]? yes, "
4907 "found breakpoint at 0x%s\n",
4908 lwpid_of (thread
), paddress (pc
));
4910 /* We've found an lwp that needs stepping over --- return 1 so
4911 that find_inferior stops looking. */
4912 current_thread
= saved_thread
;
4918 current_thread
= saved_thread
;
4921 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4923 lwpid_of (thread
), paddress (pc
));
4928 /* Start a step-over operation on LWP. When LWP stopped at a
4929 breakpoint, to make progress, we need to remove the breakpoint out
4930 of the way. If we let other threads run while we do that, they may
4931 pass by the breakpoint location and miss hitting it. To avoid
4932 that, a step-over momentarily stops all threads while LWP is
4933 single-stepped by either hardware or software while the breakpoint
4934 is temporarily uninserted from the inferior. When the single-step
4935 finishes, we reinsert the breakpoint, and let all threads that are
4936 supposed to be running, run again. */
4939 start_step_over (struct lwp_info
*lwp
)
4941 struct thread_info
*thread
= get_lwp_thread (lwp
);
4942 struct thread_info
*saved_thread
;
4947 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4950 stop_all_lwps (1, lwp
);
4952 if (lwp
->suspended
!= 0)
4954 internal_error (__FILE__
, __LINE__
,
4955 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4960 debug_printf ("Done stopping all threads for step-over.\n");
4962 /* Note, we should always reach here with an already adjusted PC,
4963 either by GDB (if we're resuming due to GDB's request), or by our
4964 caller, if we just finished handling an internal breakpoint GDB
4965 shouldn't care about. */
4968 saved_thread
= current_thread
;
4969 current_thread
= thread
;
4971 lwp
->bp_reinsert
= pc
;
4972 uninsert_breakpoints_at (pc
);
4973 uninsert_fast_tracepoint_jumps_at (pc
);
4975 step
= single_step (lwp
);
4977 current_thread
= saved_thread
;
4979 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4981 /* Require next event from this LWP. */
4982 step_over_bkpt
= thread
->entry
.id
;
4986 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4987 start_step_over, if still there, and delete any single-step
4988 breakpoints we've set, on non hardware single-step targets. */
4991 finish_step_over (struct lwp_info
*lwp
)
4993 if (lwp
->bp_reinsert
!= 0)
4995 struct thread_info
*saved_thread
= current_thread
;
4998 debug_printf ("Finished step over.\n");
5000 current_thread
= get_lwp_thread (lwp
);
5002 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
5003 may be no breakpoint to reinsert there by now. */
5004 reinsert_breakpoints_at (lwp
->bp_reinsert
);
5005 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
5007 lwp
->bp_reinsert
= 0;
5009 /* Delete any single-step breakpoints. No longer needed. We
5010 don't have to worry about other threads hitting this trap,
5011 and later not being able to explain it, because we were
5012 stepping over a breakpoint, and we hold all threads but
5013 LWP stopped while doing that. */
5014 if (!can_hardware_single_step ())
5016 gdb_assert (has_single_step_breakpoints (current_thread
));
5017 delete_single_step_breakpoints (current_thread
);
5020 step_over_bkpt
= null_ptid
;
5021 current_thread
= saved_thread
;
5028 /* If there's a step over in progress, wait until all threads stop
5029 (that is, until the stepping thread finishes its step), and
5030 unsuspend all lwps. The stepping thread ends with its status
5031 pending, which is processed later when we get back to processing
5035 complete_ongoing_step_over (void)
5037 if (!ptid_equal (step_over_bkpt
, null_ptid
))
5039 struct lwp_info
*lwp
;
5044 debug_printf ("detach: step over in progress, finish it first\n");
5046 /* Passing NULL_PTID as filter indicates we want all events to
5047 be left pending. Eventually this returns when there are no
5048 unwaited-for children left. */
5049 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
5051 gdb_assert (ret
== -1);
5053 lwp
= find_lwp_pid (step_over_bkpt
);
5055 finish_step_over (lwp
);
5056 step_over_bkpt
= null_ptid
;
5057 unsuspend_all_lwps (lwp
);
5061 /* This function is called once per thread. We check the thread's resume
5062 request, which will tell us whether to resume, step, or leave the thread
5063 stopped; and what signal, if any, it should be sent.
5065 For threads which we aren't explicitly told otherwise, we preserve
5066 the stepping flag; this is used for stepping over gdbserver-placed
5069 If pending_flags was set in any thread, we queue any needed
5070 signals, since we won't actually resume. We already have a pending
5071 event to report, so we don't need to preserve any step requests;
5072 they should be re-issued if necessary. */
5075 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
5077 struct thread_info
*thread
= (struct thread_info
*) entry
;
5078 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5079 int leave_all_stopped
= * (int *) arg
;
5082 if (lwp
->resume
== NULL
)
5085 if (lwp
->resume
->kind
== resume_stop
)
5088 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
5093 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
5095 /* Stop the thread, and wait for the event asynchronously,
5096 through the event loop. */
5102 debug_printf ("already stopped LWP %ld\n",
5105 /* The LWP may have been stopped in an internal event that
5106 was not meant to be notified back to GDB (e.g., gdbserver
5107 breakpoint), so we should be reporting a stop event in
5110 /* If the thread already has a pending SIGSTOP, this is a
5111 no-op. Otherwise, something later will presumably resume
5112 the thread and this will cause it to cancel any pending
5113 operation, due to last_resume_kind == resume_stop. If
5114 the thread already has a pending status to report, we
5115 will still report it the next time we wait - see
5116 status_pending_p_callback. */
5118 /* If we already have a pending signal to report, then
5119 there's no need to queue a SIGSTOP, as this means we're
5120 midway through moving the LWP out of the jumppad, and we
5121 will report the pending signal as soon as that is
5123 if (lwp
->pending_signals_to_report
== NULL
)
5127 /* For stop requests, we're done. */
5129 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5133 /* If this thread which is about to be resumed has a pending status,
5134 then don't resume it - we can just report the pending status.
5135 Likewise if it is suspended, because e.g., another thread is
5136 stepping past a breakpoint. Make sure to queue any signals that
5137 would otherwise be sent. In all-stop mode, we do this decision
5138 based on if *any* thread has a pending status. If there's a
5139 thread that needs the step-over-breakpoint dance, then don't
5140 resume any other thread but that particular one. */
5141 leave_pending
= (lwp
->suspended
5142 || lwp
->status_pending_p
5143 || leave_all_stopped
);
5145 /* If we have a new signal, enqueue the signal. */
5146 if (lwp
->resume
->sig
!= 0)
5148 siginfo_t info
, *info_p
;
5150 /* If this is the same signal we were previously stopped by,
5151 make sure to queue its siginfo. */
5152 if (WIFSTOPPED (lwp
->last_status
)
5153 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
5154 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
5155 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
5160 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
5166 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
5168 proceed_one_lwp (entry
, NULL
);
5173 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5176 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5182 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5184 struct thread_resume_array array
= { resume_info
, n
};
5185 struct thread_info
*need_step_over
= NULL
;
5187 int leave_all_stopped
;
5192 debug_printf ("linux_resume:\n");
5195 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
5197 /* If there is a thread which would otherwise be resumed, which has
5198 a pending status, then don't resume any threads - we can just
5199 report the pending status. Make sure to queue any signals that
5200 would otherwise be sent. In non-stop mode, we'll apply this
5201 logic to each thread individually. We consume all pending events
5202 before considering to start a step-over (in all-stop). */
5205 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
5207 /* If there is a thread which would otherwise be resumed, which is
5208 stopped at a breakpoint that needs stepping over, then don't
5209 resume any threads - have it step over the breakpoint with all
5210 other threads stopped, then resume all threads again. Make sure
5211 to queue any signals that would otherwise be delivered or
5213 if (!any_pending
&& supports_breakpoints ())
5215 = (struct thread_info
*) find_inferior (&all_threads
,
5216 need_step_over_p
, NULL
);
5218 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5222 if (need_step_over
!= NULL
)
5223 debug_printf ("Not resuming all, need step over\n");
5224 else if (any_pending
)
5225 debug_printf ("Not resuming, all-stop and found "
5226 "an LWP with pending status\n");
5228 debug_printf ("Resuming, no pending status or step over needed\n");
5231 /* Even if we're leaving threads stopped, queue all signals we'd
5232 otherwise deliver. */
5233 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
5236 start_step_over (get_thread_lwp (need_step_over
));
5240 debug_printf ("linux_resume done\n");
5244 /* We may have events that were pending that can/should be sent to
5245 the client now. Trigger a linux_wait call. */
5246 if (target_is_async_p ())
5250 /* This function is called once per thread. We check the thread's
5251 last resume request, which will tell us whether to resume, step, or
5252 leave the thread stopped. Any signal the client requested to be
5253 delivered has already been enqueued at this point.
5255 If any thread that GDB wants running is stopped at an internal
5256 breakpoint that needs stepping over, we start a step-over operation
5257 on that particular thread, and leave all others stopped. */
5260 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
5262 struct thread_info
*thread
= (struct thread_info
*) entry
;
5263 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5270 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5275 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5279 if (thread
->last_resume_kind
== resume_stop
5280 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5283 debug_printf (" client wants LWP to remain %ld stopped\n",
5288 if (lwp
->status_pending_p
)
5291 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5296 gdb_assert (lwp
->suspended
>= 0);
5301 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5305 if (thread
->last_resume_kind
== resume_stop
5306 && lwp
->pending_signals_to_report
== NULL
5307 && (lwp
->collecting_fast_tracepoint
5308 == fast_tpoint_collect_result::not_collecting
))
5310 /* We haven't reported this LWP as stopped yet (otherwise, the
5311 last_status.kind check above would catch it, and we wouldn't
5312 reach here. This LWP may have been momentarily paused by a
5313 stop_all_lwps call while handling for example, another LWP's
5314 step-over. In that case, the pending expected SIGSTOP signal
5315 that was queued at vCont;t handling time will have already
5316 been consumed by wait_for_sigstop, and so we need to requeue
5317 another one here. Note that if the LWP already has a SIGSTOP
5318 pending, this is a no-op. */
5321 debug_printf ("Client wants LWP %ld to stop. "
5322 "Making sure it has a SIGSTOP pending\n",
5328 if (thread
->last_resume_kind
== resume_step
)
5331 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5334 /* If resume_step is requested by GDB, install single-step
5335 breakpoints when the thread is about to be actually resumed if
5336 the single-step breakpoints weren't removed. */
5337 if (can_software_single_step ()
5338 && !has_single_step_breakpoints (thread
))
5339 install_software_single_step_breakpoints (lwp
);
5341 step
= maybe_hw_step (thread
);
5343 else if (lwp
->bp_reinsert
!= 0)
5346 debug_printf (" stepping LWP %ld, reinsert set\n",
5349 step
= maybe_hw_step (thread
);
5354 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5359 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
5361 struct thread_info
*thread
= (struct thread_info
*) entry
;
5362 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5367 lwp_suspended_decr (lwp
);
5369 return proceed_one_lwp (entry
, except
);
5372 /* When we finish a step-over, set threads running again. If there's
5373 another thread that may need a step-over, now's the time to start
5374 it. Eventually, we'll move all threads past their breakpoints. */
5377 proceed_all_lwps (void)
5379 struct thread_info
*need_step_over
;
5381 /* If there is a thread which would otherwise be resumed, which is
5382 stopped at a breakpoint that needs stepping over, then don't
5383 resume any threads - have it step over the breakpoint with all
5384 other threads stopped, then resume all threads again. */
5386 if (supports_breakpoints ())
5389 = (struct thread_info
*) find_inferior (&all_threads
,
5390 need_step_over_p
, NULL
);
5392 if (need_step_over
!= NULL
)
5395 debug_printf ("proceed_all_lwps: found "
5396 "thread %ld needing a step-over\n",
5397 lwpid_of (need_step_over
));
5399 start_step_over (get_thread_lwp (need_step_over
));
5405 debug_printf ("Proceeding, no step-over needed\n");
5407 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
5410 /* Stopped LWPs that the client wanted to be running, that don't have
5411 pending statuses, are set to run again, except for EXCEPT, if not
5412 NULL. This undoes a stop_all_lwps call. */
5415 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5421 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5422 lwpid_of (get_lwp_thread (except
)));
5424 debug_printf ("unstopping all lwps\n");
5428 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
5430 find_inferior (&all_threads
, proceed_one_lwp
, except
);
5434 debug_printf ("unstop_all_lwps done\n");
5440 #ifdef HAVE_LINUX_REGSETS
5442 #define use_linux_regsets 1
5444 /* Returns true if REGSET has been disabled. */
5447 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5449 return (info
->disabled_regsets
!= NULL
5450 && info
->disabled_regsets
[regset
- info
->regsets
]);
5453 /* Disable REGSET. */
5456 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5460 dr_offset
= regset
- info
->regsets
;
5461 if (info
->disabled_regsets
== NULL
)
5462 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5463 info
->disabled_regsets
[dr_offset
] = 1;
5467 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5468 struct regcache
*regcache
)
5470 struct regset_info
*regset
;
5471 int saw_general_regs
= 0;
5475 pid
= lwpid_of (current_thread
);
5476 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5481 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5484 buf
= xmalloc (regset
->size
);
5486 nt_type
= regset
->nt_type
;
5490 iov
.iov_len
= regset
->size
;
5491 data
= (void *) &iov
;
5497 res
= ptrace (regset
->get_request
, pid
,
5498 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5500 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5506 /* If we get EIO on a regset, do not try it again for
5507 this process mode. */
5508 disable_regset (regsets_info
, regset
);
5510 else if (errno
== ENODATA
)
5512 /* ENODATA may be returned if the regset is currently
5513 not "active". This can happen in normal operation,
5514 so suppress the warning in this case. */
5516 else if (errno
== ESRCH
)
5518 /* At this point, ESRCH should mean the process is
5519 already gone, in which case we simply ignore attempts
5520 to read its registers. */
5525 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5532 if (regset
->type
== GENERAL_REGS
)
5533 saw_general_regs
= 1;
5534 regset
->store_function (regcache
, buf
);
5538 if (saw_general_regs
)
5545 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5546 struct regcache
*regcache
)
5548 struct regset_info
*regset
;
5549 int saw_general_regs
= 0;
5553 pid
= lwpid_of (current_thread
);
5554 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5559 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5560 || regset
->fill_function
== NULL
)
5563 buf
= xmalloc (regset
->size
);
5565 /* First fill the buffer with the current register set contents,
5566 in case there are any items in the kernel's regset that are
5567 not in gdbserver's regcache. */
5569 nt_type
= regset
->nt_type
;
5573 iov
.iov_len
= regset
->size
;
5574 data
= (void *) &iov
;
5580 res
= ptrace (regset
->get_request
, pid
,
5581 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5583 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5588 /* Then overlay our cached registers on that. */
5589 regset
->fill_function (regcache
, buf
);
5591 /* Only now do we write the register set. */
5593 res
= ptrace (regset
->set_request
, pid
,
5594 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5596 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5604 /* If we get EIO on a regset, do not try it again for
5605 this process mode. */
5606 disable_regset (regsets_info
, regset
);
5608 else if (errno
== ESRCH
)
5610 /* At this point, ESRCH should mean the process is
5611 already gone, in which case we simply ignore attempts
5612 to change its registers. See also the related
5613 comment in linux_resume_one_lwp. */
5619 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5622 else if (regset
->type
== GENERAL_REGS
)
5623 saw_general_regs
= 1;
5626 if (saw_general_regs
)
5632 #else /* !HAVE_LINUX_REGSETS */
5634 #define use_linux_regsets 0
5635 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5636 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5640 /* Return 1 if register REGNO is supported by one of the regset ptrace
5641 calls or 0 if it has to be transferred individually. */
5644 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5646 unsigned char mask
= 1 << (regno
% 8);
5647 size_t index
= regno
/ 8;
5649 return (use_linux_regsets
5650 && (regs_info
->regset_bitmap
== NULL
5651 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5654 #ifdef HAVE_LINUX_USRREGS
5657 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5661 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5662 error ("Invalid register number %d.", regnum
);
5664 addr
= usrregs
->regmap
[regnum
];
5669 /* Fetch one register. */
5671 fetch_register (const struct usrregs_info
*usrregs
,
5672 struct regcache
*regcache
, int regno
)
5679 if (regno
>= usrregs
->num_regs
)
5681 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5684 regaddr
= register_addr (usrregs
, regno
);
5688 size
= ((register_size (regcache
->tdesc
, regno
)
5689 + sizeof (PTRACE_XFER_TYPE
) - 1)
5690 & -sizeof (PTRACE_XFER_TYPE
));
5691 buf
= (char *) alloca (size
);
5693 pid
= lwpid_of (current_thread
);
5694 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5697 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5698 ptrace (PTRACE_PEEKUSER
, pid
,
5699 /* Coerce to a uintptr_t first to avoid potential gcc warning
5700 of coercing an 8 byte integer to a 4 byte pointer. */
5701 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5702 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5704 error ("reading register %d: %s", regno
, strerror (errno
));
5707 if (the_low_target
.supply_ptrace_register
)
5708 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5710 supply_register (regcache
, regno
, buf
);
5713 /* Store one register. */
5715 store_register (const struct usrregs_info
*usrregs
,
5716 struct regcache
*regcache
, int regno
)
5723 if (regno
>= usrregs
->num_regs
)
5725 if ((*the_low_target
.cannot_store_register
) (regno
))
5728 regaddr
= register_addr (usrregs
, regno
);
5732 size
= ((register_size (regcache
->tdesc
, regno
)
5733 + sizeof (PTRACE_XFER_TYPE
) - 1)
5734 & -sizeof (PTRACE_XFER_TYPE
));
5735 buf
= (char *) alloca (size
);
5736 memset (buf
, 0, size
);
5738 if (the_low_target
.collect_ptrace_register
)
5739 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5741 collect_register (regcache
, regno
, buf
);
5743 pid
= lwpid_of (current_thread
);
5744 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5747 ptrace (PTRACE_POKEUSER
, pid
,
5748 /* Coerce to a uintptr_t first to avoid potential gcc warning
5749 about coercing an 8 byte integer to a 4 byte pointer. */
5750 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5751 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5754 /* At this point, ESRCH should mean the process is
5755 already gone, in which case we simply ignore attempts
5756 to change its registers. See also the related
5757 comment in linux_resume_one_lwp. */
5761 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5762 error ("writing register %d: %s", regno
, strerror (errno
));
5764 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5768 /* Fetch all registers, or just one, from the child process.
5769 If REGNO is -1, do this for all registers, skipping any that are
5770 assumed to have been retrieved by regsets_fetch_inferior_registers,
5771 unless ALL is non-zero.
5772 Otherwise, REGNO specifies which register (so we can save time). */
5774 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5775 struct regcache
*regcache
, int regno
, int all
)
5777 struct usrregs_info
*usr
= regs_info
->usrregs
;
5781 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5782 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5783 fetch_register (usr
, regcache
, regno
);
5786 fetch_register (usr
, regcache
, regno
);
5789 /* Store our register values back into the inferior.
5790 If REGNO is -1, do this for all registers, skipping any that are
5791 assumed to have been saved by regsets_store_inferior_registers,
5792 unless ALL is non-zero.
5793 Otherwise, REGNO specifies which register (so we can save time). */
5795 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5796 struct regcache
*regcache
, int regno
, int all
)
5798 struct usrregs_info
*usr
= regs_info
->usrregs
;
5802 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5803 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5804 store_register (usr
, regcache
, regno
);
5807 store_register (usr
, regcache
, regno
);
5810 #else /* !HAVE_LINUX_USRREGS */
5812 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5813 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5819 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5823 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5827 if (the_low_target
.fetch_register
!= NULL
5828 && regs_info
->usrregs
!= NULL
)
5829 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5830 (*the_low_target
.fetch_register
) (regcache
, regno
);
5832 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5833 if (regs_info
->usrregs
!= NULL
)
5834 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5838 if (the_low_target
.fetch_register
!= NULL
5839 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5842 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5844 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5846 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5847 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5852 linux_store_registers (struct regcache
*regcache
, int regno
)
5856 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5860 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5862 if (regs_info
->usrregs
!= NULL
)
5863 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5867 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5869 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5871 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5872 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5877 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5878 to debugger memory starting at MYADDR. */
5881 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5883 int pid
= lwpid_of (current_thread
);
5884 PTRACE_XFER_TYPE
*buffer
;
5892 /* Try using /proc. Don't bother for one word. */
5893 if (len
>= 3 * sizeof (long))
5897 /* We could keep this file open and cache it - possibly one per
5898 thread. That requires some juggling, but is even faster. */
5899 sprintf (filename
, "/proc/%d/mem", pid
);
5900 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5904 /* If pread64 is available, use it. It's faster if the kernel
5905 supports it (only one syscall), and it's 64-bit safe even on
5906 32-bit platforms (for instance, SPARC debugging a SPARC64
5909 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5912 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5913 bytes
= read (fd
, myaddr
, len
);
5920 /* Some data was read, we'll try to get the rest with ptrace. */
5930 /* Round starting address down to longword boundary. */
5931 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5932 /* Round ending address up; get number of longwords that makes. */
5933 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5934 / sizeof (PTRACE_XFER_TYPE
));
5935 /* Allocate buffer of that many longwords. */
5936 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5938 /* Read all the longwords */
5940 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5942 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5943 about coercing an 8 byte integer to a 4 byte pointer. */
5944 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5945 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5946 (PTRACE_TYPE_ARG4
) 0);
5952 /* Copy appropriate bytes out of the buffer. */
5955 i
*= sizeof (PTRACE_XFER_TYPE
);
5956 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5958 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5965 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5966 memory at MEMADDR. On failure (cannot write to the inferior)
5967 returns the value of errno. Always succeeds if LEN is zero. */
5970 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5973 /* Round starting address down to longword boundary. */
5974 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5975 /* Round ending address up; get number of longwords that makes. */
5977 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5978 / sizeof (PTRACE_XFER_TYPE
);
5980 /* Allocate buffer of that many longwords. */
5981 PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5983 int pid
= lwpid_of (current_thread
);
5987 /* Zero length write always succeeds. */
5993 /* Dump up to four bytes. */
5994 char str
[4 * 2 + 1];
5996 int dump
= len
< 4 ? len
: 4;
5998 for (i
= 0; i
< dump
; i
++)
6000 sprintf (p
, "%02x", myaddr
[i
]);
6005 debug_printf ("Writing %s to 0x%08lx in process %d\n",
6006 str
, (long) memaddr
, pid
);
6009 /* Fill start and end extra bytes of buffer with existing memory data. */
6012 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
6013 about coercing an 8 byte integer to a 4 byte pointer. */
6014 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
6015 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
6016 (PTRACE_TYPE_ARG4
) 0);
6024 = ptrace (PTRACE_PEEKTEXT
, pid
,
6025 /* Coerce to a uintptr_t first to avoid potential gcc warning
6026 about coercing an 8 byte integer to a 4 byte pointer. */
6027 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
6028 * sizeof (PTRACE_XFER_TYPE
)),
6029 (PTRACE_TYPE_ARG4
) 0);
6034 /* Copy data to be written over corresponding part of buffer. */
6036 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
6039 /* Write the entire buffer. */
6041 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
6044 ptrace (PTRACE_POKETEXT
, pid
,
6045 /* Coerce to a uintptr_t first to avoid potential gcc warning
6046 about coercing an 8 byte integer to a 4 byte pointer. */
6047 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
6048 (PTRACE_TYPE_ARG4
) buffer
[i
]);
6057 linux_look_up_symbols (void)
6059 #ifdef USE_THREAD_DB
6060 struct process_info
*proc
= current_process ();
6062 if (proc
->priv
->thread_db
!= NULL
)
6070 linux_request_interrupt (void)
6072 /* Send a SIGINT to the process group. This acts just like the user
6073 typed a ^C on the controlling terminal. */
6074 kill (-signal_pid
, SIGINT
);
6077 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
6078 to debugger memory starting at MYADDR. */
6081 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
6083 char filename
[PATH_MAX
];
6085 int pid
= lwpid_of (current_thread
);
6087 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6089 fd
= open (filename
, O_RDONLY
);
6093 if (offset
!= (CORE_ADDR
) 0
6094 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6097 n
= read (fd
, myaddr
, len
);
6104 /* These breakpoint and watchpoint related wrapper functions simply
6105 pass on the function call if the target has registered a
6106 corresponding function. */
6109 linux_supports_z_point_type (char z_type
)
6111 return (the_low_target
.supports_z_point_type
!= NULL
6112 && the_low_target
.supports_z_point_type (z_type
));
6116 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6117 int size
, struct raw_breakpoint
*bp
)
6119 if (type
== raw_bkpt_type_sw
)
6120 return insert_memory_breakpoint (bp
);
6121 else if (the_low_target
.insert_point
!= NULL
)
6122 return the_low_target
.insert_point (type
, addr
, size
, bp
);
6124 /* Unsupported (see target.h). */
6129 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6130 int size
, struct raw_breakpoint
*bp
)
6132 if (type
== raw_bkpt_type_sw
)
6133 return remove_memory_breakpoint (bp
);
6134 else if (the_low_target
.remove_point
!= NULL
)
6135 return the_low_target
.remove_point (type
, addr
, size
, bp
);
6137 /* Unsupported (see target.h). */
6141 /* Implement the to_stopped_by_sw_breakpoint target_ops
6145 linux_stopped_by_sw_breakpoint (void)
6147 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6149 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
6152 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
6156 linux_supports_stopped_by_sw_breakpoint (void)
6158 return USE_SIGTRAP_SIGINFO
;
6161 /* Implement the to_stopped_by_hw_breakpoint target_ops
6165 linux_stopped_by_hw_breakpoint (void)
6167 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6169 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6172 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6176 linux_supports_stopped_by_hw_breakpoint (void)
6178 return USE_SIGTRAP_SIGINFO
;
6181 /* Implement the supports_hardware_single_step target_ops method. */
6184 linux_supports_hardware_single_step (void)
6186 return can_hardware_single_step ();
6190 linux_supports_software_single_step (void)
6192 return can_software_single_step ();
6196 linux_stopped_by_watchpoint (void)
6198 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6200 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6204 linux_stopped_data_address (void)
6206 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6208 return lwp
->stopped_data_address
;
6211 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6212 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6213 && defined(PT_TEXT_END_ADDR)
6215 /* This is only used for targets that define PT_TEXT_ADDR,
6216 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6217 the target has different ways of acquiring this information, like
6220 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6221 to tell gdb about. */
6224 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6226 unsigned long text
, text_end
, data
;
6227 int pid
= lwpid_of (current_thread
);
6231 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6232 (PTRACE_TYPE_ARG4
) 0);
6233 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6234 (PTRACE_TYPE_ARG4
) 0);
6235 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6236 (PTRACE_TYPE_ARG4
) 0);
6240 /* Both text and data offsets produced at compile-time (and so
6241 used by gdb) are relative to the beginning of the program,
6242 with the data segment immediately following the text segment.
6243 However, the actual runtime layout in memory may put the data
6244 somewhere else, so when we send gdb a data base-address, we
6245 use the real data base address and subtract the compile-time
6246 data base-address from it (which is just the length of the
6247 text segment). BSS immediately follows data in both
6250 *data_p
= data
- (text_end
- text
);
6259 linux_qxfer_osdata (const char *annex
,
6260 unsigned char *readbuf
, unsigned const char *writebuf
,
6261 CORE_ADDR offset
, int len
)
6263 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6266 /* Convert a native/host siginfo object, into/from the siginfo in the
6267 layout of the inferiors' architecture. */
6270 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6274 if (the_low_target
.siginfo_fixup
!= NULL
)
6275 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6277 /* If there was no callback, or the callback didn't do anything,
6278 then just do a straight memcpy. */
6282 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6284 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6289 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6290 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6294 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6296 if (current_thread
== NULL
)
6299 pid
= lwpid_of (current_thread
);
6302 debug_printf ("%s siginfo for lwp %d.\n",
6303 readbuf
!= NULL
? "Reading" : "Writing",
6306 if (offset
>= sizeof (siginfo
))
6309 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6312 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6313 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6314 inferior with a 64-bit GDBSERVER should look the same as debugging it
6315 with a 32-bit GDBSERVER, we need to convert it. */
6316 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6318 if (offset
+ len
> sizeof (siginfo
))
6319 len
= sizeof (siginfo
) - offset
;
6321 if (readbuf
!= NULL
)
6322 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6325 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6327 /* Convert back to ptrace layout before flushing it out. */
6328 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6330 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6337 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6338 so we notice when children change state; as the handler for the
6339 sigsuspend in my_waitpid. */
6342 sigchld_handler (int signo
)
6344 int old_errno
= errno
;
6350 /* fprintf is not async-signal-safe, so call write
6352 if (write (2, "sigchld_handler\n",
6353 sizeof ("sigchld_handler\n") - 1) < 0)
6354 break; /* just ignore */
6358 if (target_is_async_p ())
6359 async_file_mark (); /* trigger a linux_wait */
6365 linux_supports_non_stop (void)
6371 linux_async (int enable
)
6373 int previous
= target_is_async_p ();
6376 debug_printf ("linux_async (%d), previous=%d\n",
6379 if (previous
!= enable
)
6382 sigemptyset (&mask
);
6383 sigaddset (&mask
, SIGCHLD
);
6385 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6389 if (pipe (linux_event_pipe
) == -1)
6391 linux_event_pipe
[0] = -1;
6392 linux_event_pipe
[1] = -1;
6393 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6395 warning ("creating event pipe failed.");
6399 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6400 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6402 /* Register the event loop handler. */
6403 add_file_handler (linux_event_pipe
[0],
6404 handle_target_event
, NULL
);
6406 /* Always trigger a linux_wait. */
6411 delete_file_handler (linux_event_pipe
[0]);
6413 close (linux_event_pipe
[0]);
6414 close (linux_event_pipe
[1]);
6415 linux_event_pipe
[0] = -1;
6416 linux_event_pipe
[1] = -1;
6419 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6426 linux_start_non_stop (int nonstop
)
6428 /* Register or unregister from event-loop accordingly. */
6429 linux_async (nonstop
);
6431 if (target_is_async_p () != (nonstop
!= 0))
6438 linux_supports_multi_process (void)
6443 /* Check if fork events are supported. */
6446 linux_supports_fork_events (void)
6448 return linux_supports_tracefork ();
6451 /* Check if vfork events are supported. */
6454 linux_supports_vfork_events (void)
6456 return linux_supports_tracefork ();
6459 /* Check if exec events are supported. */
6462 linux_supports_exec_events (void)
6464 return linux_supports_traceexec ();
6467 /* Callback for 'find_inferior'. Set the (possibly changed) ptrace
6468 options for the specified lwp. */
6471 reset_lwp_ptrace_options_callback (struct inferior_list_entry
*entry
,
6474 struct thread_info
*thread
= (struct thread_info
*) entry
;
6475 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6479 /* Stop the lwp so we can modify its ptrace options. */
6480 lwp
->must_set_ptrace_flags
= 1;
6481 linux_stop_lwp (lwp
);
6485 /* Already stopped; go ahead and set the ptrace options. */
6486 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6487 int options
= linux_low_ptrace_options (proc
->attached
);
6489 linux_enable_event_reporting (lwpid_of (thread
), options
);
6490 lwp
->must_set_ptrace_flags
= 0;
6496 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6497 ptrace flags for all inferiors. This is in case the new GDB connection
6498 doesn't support the same set of events that the previous one did. */
6501 linux_handle_new_gdb_connection (void)
6505 /* Request that all the lwps reset their ptrace options. */
6506 find_inferior (&all_threads
, reset_lwp_ptrace_options_callback
, &pid
);
6510 linux_supports_disable_randomization (void)
6512 #ifdef HAVE_PERSONALITY
6520 linux_supports_agent (void)
6526 linux_supports_range_stepping (void)
6528 if (can_software_single_step ())
6530 if (*the_low_target
.supports_range_stepping
== NULL
)
6533 return (*the_low_target
.supports_range_stepping
) ();
6536 /* Enumerate spufs IDs for process PID. */
6538 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6544 struct dirent
*entry
;
6546 sprintf (path
, "/proc/%ld/fd", pid
);
6547 dir
= opendir (path
);
6552 while ((entry
= readdir (dir
)) != NULL
)
6558 fd
= atoi (entry
->d_name
);
6562 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6563 if (stat (path
, &st
) != 0)
6565 if (!S_ISDIR (st
.st_mode
))
6568 if (statfs (path
, &stfs
) != 0)
6570 if (stfs
.f_type
!= SPUFS_MAGIC
)
6573 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6575 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6585 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6586 object type, using the /proc file system. */
6588 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6589 unsigned const char *writebuf
,
6590 CORE_ADDR offset
, int len
)
6592 long pid
= lwpid_of (current_thread
);
6597 if (!writebuf
&& !readbuf
)
6605 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6608 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6609 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6614 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6621 ret
= write (fd
, writebuf
, (size_t) len
);
6623 ret
= read (fd
, readbuf
, (size_t) len
);
6629 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6630 struct target_loadseg
6632 /* Core address to which the segment is mapped. */
6634 /* VMA recorded in the program header. */
6636 /* Size of this segment in memory. */
6640 # if defined PT_GETDSBT
6641 struct target_loadmap
6643 /* Protocol version number, must be zero. */
6645 /* Pointer to the DSBT table, its size, and the DSBT index. */
6646 unsigned *dsbt_table
;
6647 unsigned dsbt_size
, dsbt_index
;
6648 /* Number of segments in this map. */
6650 /* The actual memory map. */
6651 struct target_loadseg segs
[/*nsegs*/];
6653 # define LINUX_LOADMAP PT_GETDSBT
6654 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6655 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6657 struct target_loadmap
6659 /* Protocol version number, must be zero. */
6661 /* Number of segments in this map. */
6663 /* The actual memory map. */
6664 struct target_loadseg segs
[/*nsegs*/];
6666 # define LINUX_LOADMAP PTRACE_GETFDPIC
6667 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6668 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6672 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6673 unsigned char *myaddr
, unsigned int len
)
6675 int pid
= lwpid_of (current_thread
);
6677 struct target_loadmap
*data
= NULL
;
6678 unsigned int actual_length
, copy_length
;
6680 if (strcmp (annex
, "exec") == 0)
6681 addr
= (int) LINUX_LOADMAP_EXEC
;
6682 else if (strcmp (annex
, "interp") == 0)
6683 addr
= (int) LINUX_LOADMAP_INTERP
;
6687 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6693 actual_length
= sizeof (struct target_loadmap
)
6694 + sizeof (struct target_loadseg
) * data
->nsegs
;
6696 if (offset
< 0 || offset
> actual_length
)
6699 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6700 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6704 # define linux_read_loadmap NULL
6705 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6708 linux_process_qsupported (char **features
, int count
)
6710 if (the_low_target
.process_qsupported
!= NULL
)
6711 the_low_target
.process_qsupported (features
, count
);
6715 linux_supports_catch_syscall (void)
6717 return (the_low_target
.get_syscall_trapinfo
!= NULL
6718 && linux_supports_tracesysgood ());
6722 linux_get_ipa_tdesc_idx (void)
6724 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6727 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6731 linux_supports_tracepoints (void)
6733 if (*the_low_target
.supports_tracepoints
== NULL
)
6736 return (*the_low_target
.supports_tracepoints
) ();
6740 linux_read_pc (struct regcache
*regcache
)
6742 if (the_low_target
.get_pc
== NULL
)
6745 return (*the_low_target
.get_pc
) (regcache
);
6749 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6751 gdb_assert (the_low_target
.set_pc
!= NULL
);
6753 (*the_low_target
.set_pc
) (regcache
, pc
);
6757 linux_thread_stopped (struct thread_info
*thread
)
6759 return get_thread_lwp (thread
)->stopped
;
6762 /* This exposes stop-all-threads functionality to other modules. */
6765 linux_pause_all (int freeze
)
6767 stop_all_lwps (freeze
, NULL
);
6770 /* This exposes unstop-all-threads functionality to other gdbserver
6774 linux_unpause_all (int unfreeze
)
6776 unstop_all_lwps (unfreeze
, NULL
);
6780 linux_prepare_to_access_memory (void)
6782 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6785 linux_pause_all (1);
6790 linux_done_accessing_memory (void)
6792 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6795 linux_unpause_all (1);
6799 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6800 CORE_ADDR collector
,
6803 CORE_ADDR
*jump_entry
,
6804 CORE_ADDR
*trampoline
,
6805 ULONGEST
*trampoline_size
,
6806 unsigned char *jjump_pad_insn
,
6807 ULONGEST
*jjump_pad_insn_size
,
6808 CORE_ADDR
*adjusted_insn_addr
,
6809 CORE_ADDR
*adjusted_insn_addr_end
,
6812 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6813 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6814 jump_entry
, trampoline
, trampoline_size
,
6815 jjump_pad_insn
, jjump_pad_insn_size
,
6816 adjusted_insn_addr
, adjusted_insn_addr_end
,
6820 static struct emit_ops
*
6821 linux_emit_ops (void)
6823 if (the_low_target
.emit_ops
!= NULL
)
6824 return (*the_low_target
.emit_ops
) ();
6830 linux_get_min_fast_tracepoint_insn_len (void)
6832 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6835 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6838 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6839 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6841 char filename
[PATH_MAX
];
6843 const int auxv_size
= is_elf64
6844 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6845 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6847 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6849 fd
= open (filename
, O_RDONLY
);
6855 while (read (fd
, buf
, auxv_size
) == auxv_size
6856 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6860 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6862 switch (aux
->a_type
)
6865 *phdr_memaddr
= aux
->a_un
.a_val
;
6868 *num_phdr
= aux
->a_un
.a_val
;
6874 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6876 switch (aux
->a_type
)
6879 *phdr_memaddr
= aux
->a_un
.a_val
;
6882 *num_phdr
= aux
->a_un
.a_val
;
6890 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6892 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6893 "phdr_memaddr = %ld, phdr_num = %d",
6894 (long) *phdr_memaddr
, *num_phdr
);
6901 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6904 get_dynamic (const int pid
, const int is_elf64
)
6906 CORE_ADDR phdr_memaddr
, relocation
;
6908 unsigned char *phdr_buf
;
6909 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6911 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6914 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6915 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6917 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6920 /* Compute relocation: it is expected to be 0 for "regular" executables,
6921 non-zero for PIE ones. */
6923 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6926 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6928 if (p
->p_type
== PT_PHDR
)
6929 relocation
= phdr_memaddr
- p
->p_vaddr
;
6933 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6935 if (p
->p_type
== PT_PHDR
)
6936 relocation
= phdr_memaddr
- p
->p_vaddr
;
6939 if (relocation
== -1)
6941 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6942 any real world executables, including PIE executables, have always
6943 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6944 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6945 or present DT_DEBUG anyway (fpc binaries are statically linked).
6947 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6949 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6954 for (i
= 0; i
< num_phdr
; i
++)
6958 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6960 if (p
->p_type
== PT_DYNAMIC
)
6961 return p
->p_vaddr
+ relocation
;
6965 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6967 if (p
->p_type
== PT_DYNAMIC
)
6968 return p
->p_vaddr
+ relocation
;
6975 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6976 can be 0 if the inferior does not yet have the library list initialized.
6977 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6978 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6981 get_r_debug (const int pid
, const int is_elf64
)
6983 CORE_ADDR dynamic_memaddr
;
6984 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6985 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6988 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6989 if (dynamic_memaddr
== 0)
6992 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6996 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6997 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
7001 unsigned char buf
[sizeof (Elf64_Xword
)];
7005 #ifdef DT_MIPS_RLD_MAP
7006 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
7008 if (linux_read_memory (dyn
->d_un
.d_val
,
7009 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7014 #endif /* DT_MIPS_RLD_MAP */
7015 #ifdef DT_MIPS_RLD_MAP_REL
7016 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
7018 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
7019 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7024 #endif /* DT_MIPS_RLD_MAP_REL */
7026 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
7027 map
= dyn
->d_un
.d_val
;
7029 if (dyn
->d_tag
== DT_NULL
)
7034 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
7035 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
7039 unsigned char buf
[sizeof (Elf32_Word
)];
7043 #ifdef DT_MIPS_RLD_MAP
7044 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
7046 if (linux_read_memory (dyn
->d_un
.d_val
,
7047 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7052 #endif /* DT_MIPS_RLD_MAP */
7053 #ifdef DT_MIPS_RLD_MAP_REL
7054 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
7056 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
7057 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7062 #endif /* DT_MIPS_RLD_MAP_REL */
7064 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
7065 map
= dyn
->d_un
.d_val
;
7067 if (dyn
->d_tag
== DT_NULL
)
7071 dynamic_memaddr
+= dyn_size
;
7077 /* Read one pointer from MEMADDR in the inferior. */
7080 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
7084 /* Go through a union so this works on either big or little endian
7085 hosts, when the inferior's pointer size is smaller than the size
7086 of CORE_ADDR. It is assumed the inferior's endianness is the
7087 same of the superior's. */
7090 CORE_ADDR core_addr
;
7095 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
7098 if (ptr_size
== sizeof (CORE_ADDR
))
7099 *ptr
= addr
.core_addr
;
7100 else if (ptr_size
== sizeof (unsigned int))
7103 gdb_assert_not_reached ("unhandled pointer size");
7108 struct link_map_offsets
7110 /* Offset and size of r_debug.r_version. */
7111 int r_version_offset
;
7113 /* Offset and size of r_debug.r_map. */
7116 /* Offset to l_addr field in struct link_map. */
7119 /* Offset to l_name field in struct link_map. */
7122 /* Offset to l_ld field in struct link_map. */
7125 /* Offset to l_next field in struct link_map. */
7128 /* Offset to l_prev field in struct link_map. */
7132 /* Construct qXfer:libraries-svr4:read reply. */
7135 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
7136 unsigned const char *writebuf
,
7137 CORE_ADDR offset
, int len
)
7140 unsigned document_len
;
7141 struct process_info_private
*const priv
= current_process ()->priv
;
7142 char filename
[PATH_MAX
];
7145 static const struct link_map_offsets lmo_32bit_offsets
=
7147 0, /* r_version offset. */
7148 4, /* r_debug.r_map offset. */
7149 0, /* l_addr offset in link_map. */
7150 4, /* l_name offset in link_map. */
7151 8, /* l_ld offset in link_map. */
7152 12, /* l_next offset in link_map. */
7153 16 /* l_prev offset in link_map. */
7156 static const struct link_map_offsets lmo_64bit_offsets
=
7158 0, /* r_version offset. */
7159 8, /* r_debug.r_map offset. */
7160 0, /* l_addr offset in link_map. */
7161 8, /* l_name offset in link_map. */
7162 16, /* l_ld offset in link_map. */
7163 24, /* l_next offset in link_map. */
7164 32 /* l_prev offset in link_map. */
7166 const struct link_map_offsets
*lmo
;
7167 unsigned int machine
;
7169 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7170 int allocated
= 1024;
7172 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7173 int header_done
= 0;
7175 if (writebuf
!= NULL
)
7177 if (readbuf
== NULL
)
7180 pid
= lwpid_of (current_thread
);
7181 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7182 is_elf64
= elf_64_file_p (filename
, &machine
);
7183 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7184 ptr_size
= is_elf64
? 8 : 4;
7186 while (annex
[0] != '\0')
7192 sep
= strchr (annex
, '=');
7197 if (len
== 5 && startswith (annex
, "start"))
7199 else if (len
== 4 && startswith (annex
, "prev"))
7203 annex
= strchr (sep
, ';');
7210 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7217 if (priv
->r_debug
== 0)
7218 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7220 /* We failed to find DT_DEBUG. Such situation will not change
7221 for this inferior - do not retry it. Report it to GDB as
7222 E01, see for the reasons at the GDB solib-svr4.c side. */
7223 if (priv
->r_debug
== (CORE_ADDR
) -1)
7226 if (priv
->r_debug
!= 0)
7228 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7229 (unsigned char *) &r_version
,
7230 sizeof (r_version
)) != 0
7233 warning ("unexpected r_debug version %d", r_version
);
7235 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7236 &lm_addr
, ptr_size
) != 0)
7238 warning ("unable to read r_map from 0x%lx",
7239 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7244 document
= (char *) xmalloc (allocated
);
7245 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7246 p
= document
+ strlen (document
);
7249 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7250 &l_name
, ptr_size
) == 0
7251 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7252 &l_addr
, ptr_size
) == 0
7253 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7254 &l_ld
, ptr_size
) == 0
7255 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7256 &l_prev
, ptr_size
) == 0
7257 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7258 &l_next
, ptr_size
) == 0)
7260 unsigned char libname
[PATH_MAX
];
7262 if (lm_prev
!= l_prev
)
7264 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7265 (long) lm_prev
, (long) l_prev
);
7269 /* Ignore the first entry even if it has valid name as the first entry
7270 corresponds to the main executable. The first entry should not be
7271 skipped if the dynamic loader was loaded late by a static executable
7272 (see solib-svr4.c parameter ignore_first). But in such case the main
7273 executable does not have PT_DYNAMIC present and this function already
7274 exited above due to failed get_r_debug. */
7277 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7282 /* Not checking for error because reading may stop before
7283 we've got PATH_MAX worth of characters. */
7285 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7286 libname
[sizeof (libname
) - 1] = '\0';
7287 if (libname
[0] != '\0')
7289 /* 6x the size for xml_escape_text below. */
7290 size_t len
= 6 * strlen ((char *) libname
);
7294 /* Terminate `<library-list-svr4'. */
7299 while (allocated
< p
- document
+ len
+ 200)
7301 /* Expand to guarantee sufficient storage. */
7302 uintptr_t document_len
= p
- document
;
7304 document
= (char *) xrealloc (document
, 2 * allocated
);
7306 p
= document
+ document_len
;
7309 std::string name
= xml_escape_text ((char *) libname
);
7310 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7311 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7312 name
.c_str (), (unsigned long) lm_addr
,
7313 (unsigned long) l_addr
, (unsigned long) l_ld
);
7323 /* Empty list; terminate `<library-list-svr4'. */
7327 strcpy (p
, "</library-list-svr4>");
7329 document_len
= strlen (document
);
7330 if (offset
< document_len
)
7331 document_len
-= offset
;
7334 if (len
> document_len
)
7337 memcpy (readbuf
, document
+ offset
, len
);
7343 #ifdef HAVE_LINUX_BTRACE
7345 /* See to_disable_btrace target method. */
7348 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7350 enum btrace_error err
;
7352 err
= linux_disable_btrace (tinfo
);
7353 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7356 /* Encode an Intel Processor Trace configuration. */
7359 linux_low_encode_pt_config (struct buffer
*buffer
,
7360 const struct btrace_data_pt_config
*config
)
7362 buffer_grow_str (buffer
, "<pt-config>\n");
7364 switch (config
->cpu
.vendor
)
7367 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7368 "model=\"%u\" stepping=\"%u\"/>\n",
7369 config
->cpu
.family
, config
->cpu
.model
,
7370 config
->cpu
.stepping
);
7377 buffer_grow_str (buffer
, "</pt-config>\n");
7380 /* Encode a raw buffer. */
7383 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7389 /* We use hex encoding - see common/rsp-low.h. */
7390 buffer_grow_str (buffer
, "<raw>\n");
7396 elem
[0] = tohex ((*data
>> 4) & 0xf);
7397 elem
[1] = tohex (*data
++ & 0xf);
7399 buffer_grow (buffer
, elem
, 2);
7402 buffer_grow_str (buffer
, "</raw>\n");
7405 /* See to_read_btrace target method. */
7408 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7409 enum btrace_read_type type
)
7411 struct btrace_data btrace
;
7412 struct btrace_block
*block
;
7413 enum btrace_error err
;
7416 btrace_data_init (&btrace
);
7418 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7419 if (err
!= BTRACE_ERR_NONE
)
7421 if (err
== BTRACE_ERR_OVERFLOW
)
7422 buffer_grow_str0 (buffer
, "E.Overflow.");
7424 buffer_grow_str0 (buffer
, "E.Generic Error.");
7429 switch (btrace
.format
)
7431 case BTRACE_FORMAT_NONE
:
7432 buffer_grow_str0 (buffer
, "E.No Trace.");
7435 case BTRACE_FORMAT_BTS
:
7436 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7437 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7440 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7442 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7443 paddress (block
->begin
), paddress (block
->end
));
7445 buffer_grow_str0 (buffer
, "</btrace>\n");
7448 case BTRACE_FORMAT_PT
:
7449 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7450 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7451 buffer_grow_str (buffer
, "<pt>\n");
7453 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7455 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7456 btrace
.variant
.pt
.size
);
7458 buffer_grow_str (buffer
, "</pt>\n");
7459 buffer_grow_str0 (buffer
, "</btrace>\n");
7463 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7467 btrace_data_fini (&btrace
);
7471 btrace_data_fini (&btrace
);
7475 /* See to_btrace_conf target method. */
7478 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7479 struct buffer
*buffer
)
7481 const struct btrace_config
*conf
;
7483 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7484 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7486 conf
= linux_btrace_conf (tinfo
);
7489 switch (conf
->format
)
7491 case BTRACE_FORMAT_NONE
:
7494 case BTRACE_FORMAT_BTS
:
7495 buffer_xml_printf (buffer
, "<bts");
7496 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7497 buffer_xml_printf (buffer
, " />\n");
7500 case BTRACE_FORMAT_PT
:
7501 buffer_xml_printf (buffer
, "<pt");
7502 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7503 buffer_xml_printf (buffer
, "/>\n");
7508 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7511 #endif /* HAVE_LINUX_BTRACE */
7513 /* See nat/linux-nat.h. */
7516 current_lwp_ptid (void)
7518 return ptid_of (current_thread
);
7521 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7524 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7526 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7527 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7529 return default_breakpoint_kind_from_pc (pcptr
);
7532 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7534 static const gdb_byte
*
7535 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7537 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7539 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7542 /* Implementation of the target_ops method
7543 "breakpoint_kind_from_current_state". */
7546 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7548 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7549 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7551 return linux_breakpoint_kind_from_pc (pcptr
);
7554 /* Default implementation of linux_target_ops method "set_pc" for
7555 32-bit pc register which is literally named "pc". */
7558 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7560 uint32_t newpc
= pc
;
7562 supply_register_by_name (regcache
, "pc", &newpc
);
7565 /* Default implementation of linux_target_ops method "get_pc" for
7566 32-bit pc register which is literally named "pc". */
7569 linux_get_pc_32bit (struct regcache
*regcache
)
7573 collect_register_by_name (regcache
, "pc", &pc
);
7575 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7579 /* Default implementation of linux_target_ops method "set_pc" for
7580 64-bit pc register which is literally named "pc". */
7583 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7585 uint64_t newpc
= pc
;
7587 supply_register_by_name (regcache
, "pc", &newpc
);
7590 /* Default implementation of linux_target_ops method "get_pc" for
7591 64-bit pc register which is literally named "pc". */
7594 linux_get_pc_64bit (struct regcache
*regcache
)
7598 collect_register_by_name (regcache
, "pc", &pc
);
7600 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7605 static struct target_ops linux_target_ops
= {
7606 linux_create_inferior
,
7607 linux_post_create_inferior
,
7616 linux_fetch_registers
,
7617 linux_store_registers
,
7618 linux_prepare_to_access_memory
,
7619 linux_done_accessing_memory
,
7622 linux_look_up_symbols
,
7623 linux_request_interrupt
,
7625 linux_supports_z_point_type
,
7628 linux_stopped_by_sw_breakpoint
,
7629 linux_supports_stopped_by_sw_breakpoint
,
7630 linux_stopped_by_hw_breakpoint
,
7631 linux_supports_stopped_by_hw_breakpoint
,
7632 linux_supports_hardware_single_step
,
7633 linux_stopped_by_watchpoint
,
7634 linux_stopped_data_address
,
7635 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7636 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7637 && defined(PT_TEXT_END_ADDR)
7642 #ifdef USE_THREAD_DB
7643 thread_db_get_tls_address
,
7648 hostio_last_error_from_errno
,
7651 linux_supports_non_stop
,
7653 linux_start_non_stop
,
7654 linux_supports_multi_process
,
7655 linux_supports_fork_events
,
7656 linux_supports_vfork_events
,
7657 linux_supports_exec_events
,
7658 linux_handle_new_gdb_connection
,
7659 #ifdef USE_THREAD_DB
7660 thread_db_handle_monitor_command
,
7664 linux_common_core_of_thread
,
7666 linux_process_qsupported
,
7667 linux_supports_tracepoints
,
7670 linux_thread_stopped
,
7674 linux_stabilize_threads
,
7675 linux_install_fast_tracepoint_jump_pad
,
7677 linux_supports_disable_randomization
,
7678 linux_get_min_fast_tracepoint_insn_len
,
7679 linux_qxfer_libraries_svr4
,
7680 linux_supports_agent
,
7681 #ifdef HAVE_LINUX_BTRACE
7682 linux_supports_btrace
,
7683 linux_enable_btrace
,
7684 linux_low_disable_btrace
,
7685 linux_low_read_btrace
,
7686 linux_low_btrace_conf
,
7694 linux_supports_range_stepping
,
7695 linux_proc_pid_to_exec_file
,
7696 linux_mntns_open_cloexec
,
7698 linux_mntns_readlink
,
7699 linux_breakpoint_kind_from_pc
,
7700 linux_sw_breakpoint_from_kind
,
7701 linux_proc_tid_get_name
,
7702 linux_breakpoint_kind_from_current_state
,
7703 linux_supports_software_single_step
,
7704 linux_supports_catch_syscall
,
7705 linux_get_ipa_tdesc_idx
,
7708 #ifdef HAVE_LINUX_REGSETS
7710 initialize_regsets_info (struct regsets_info
*info
)
7712 for (info
->num_regsets
= 0;
7713 info
->regsets
[info
->num_regsets
].size
>= 0;
7714 info
->num_regsets
++)
7720 initialize_low (void)
7722 struct sigaction sigchld_action
;
7724 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7725 set_target_ops (&linux_target_ops
);
7727 linux_ptrace_init_warnings ();
7729 sigchld_action
.sa_handler
= sigchld_handler
;
7730 sigemptyset (&sigchld_action
.sa_mask
);
7731 sigchld_action
.sa_flags
= SA_RESTART
;
7732 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7734 initialize_low_arch ();
7736 linux_check_ptrace_features ();