1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2016 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "linux-low.h"
21 #include "nat/linux-osdata.h"
26 #include "nat/linux-nat.h"
27 #include "nat/linux-waitpid.h"
29 #include "nat/gdb_ptrace.h"
30 #include "nat/linux-ptrace.h"
31 #include "nat/linux-procfs.h"
32 #include "nat/linux-personality.h"
34 #include <sys/ioctl.h>
37 #include <sys/syscall.h>
41 #include <sys/types.h>
46 #include "filestuff.h"
47 #include "tracepoint.h"
51 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
52 then ELFMAG0 will have been defined. If it didn't get included by
53 gdb_proc_service.h then including it will likely introduce a duplicate
54 definition of elf_fpregset_t. */
57 #include "nat/linux-namespaces.h"
60 #define SPUFS_MAGIC 0x23c9b64e
63 #ifdef HAVE_PERSONALITY
64 # include <sys/personality.h>
65 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
66 # define ADDR_NO_RANDOMIZE 0x0040000
74 /* Some targets did not define these ptrace constants from the start,
75 so gdbserver defines them locally here. In the future, these may
76 be removed after they are added to asm/ptrace.h. */
77 #if !(defined(PT_TEXT_ADDR) \
78 || defined(PT_DATA_ADDR) \
79 || defined(PT_TEXT_END_ADDR))
80 #if defined(__mcoldfire__)
81 /* These are still undefined in 3.10 kernels. */
82 #define PT_TEXT_ADDR 49*4
83 #define PT_DATA_ADDR 50*4
84 #define PT_TEXT_END_ADDR 51*4
85 /* BFIN already defines these since at least 2.6.32 kernels. */
87 #define PT_TEXT_ADDR 220
88 #define PT_TEXT_END_ADDR 224
89 #define PT_DATA_ADDR 228
90 /* These are still undefined in 3.10 kernels. */
91 #elif defined(__TMS320C6X__)
92 #define PT_TEXT_ADDR (0x10000*4)
93 #define PT_DATA_ADDR (0x10004*4)
94 #define PT_TEXT_END_ADDR (0x10008*4)
98 #ifdef HAVE_LINUX_BTRACE
99 # include "nat/linux-btrace.h"
100 # include "btrace-common.h"
103 #ifndef HAVE_ELF32_AUXV_T
104 /* Copied from glibc's elf.h. */
107 uint32_t a_type
; /* Entry type */
110 uint32_t a_val
; /* Integer value */
111 /* We use to have pointer elements added here. We cannot do that,
112 though, since it does not work when using 32-bit definitions
113 on 64-bit platforms and vice versa. */
118 #ifndef HAVE_ELF64_AUXV_T
119 /* Copied from glibc's elf.h. */
122 uint64_t a_type
; /* Entry type */
125 uint64_t a_val
; /* Integer value */
126 /* We use to have pointer elements added here. We cannot do that,
127 though, since it does not work when using 32-bit definitions
128 on 64-bit platforms and vice versa. */
133 /* Does the current host support PTRACE_GETREGSET? */
134 int have_ptrace_getregset
= -1;
138 /* See nat/linux-nat.h. */
141 ptid_of_lwp (struct lwp_info
*lwp
)
143 return ptid_of (get_lwp_thread (lwp
));
146 /* See nat/linux-nat.h. */
149 lwp_set_arch_private_info (struct lwp_info
*lwp
,
150 struct arch_lwp_info
*info
)
152 lwp
->arch_private
= info
;
155 /* See nat/linux-nat.h. */
157 struct arch_lwp_info
*
158 lwp_arch_private_info (struct lwp_info
*lwp
)
160 return lwp
->arch_private
;
163 /* See nat/linux-nat.h. */
166 lwp_is_stopped (struct lwp_info
*lwp
)
171 /* See nat/linux-nat.h. */
173 enum target_stop_reason
174 lwp_stop_reason (struct lwp_info
*lwp
)
176 return lwp
->stop_reason
;
179 /* A list of all unknown processes which receive stop signals. Some
180 other process will presumably claim each of these as forked
181 children momentarily. */
183 struct simple_pid_list
185 /* The process ID. */
188 /* The status as reported by waitpid. */
192 struct simple_pid_list
*next
;
194 struct simple_pid_list
*stopped_pids
;
196 /* Trivial list manipulation functions to keep track of a list of new
197 stopped processes. */
200 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
202 struct simple_pid_list
*new_pid
= XNEW (struct simple_pid_list
);
205 new_pid
->status
= status
;
206 new_pid
->next
= *listp
;
211 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
213 struct simple_pid_list
**p
;
215 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
216 if ((*p
)->pid
== pid
)
218 struct simple_pid_list
*next
= (*p
)->next
;
220 *statusp
= (*p
)->status
;
228 enum stopping_threads_kind
230 /* Not stopping threads presently. */
231 NOT_STOPPING_THREADS
,
233 /* Stopping threads. */
236 /* Stopping and suspending threads. */
237 STOPPING_AND_SUSPENDING_THREADS
240 /* This is set while stop_all_lwps is in effect. */
241 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
243 /* FIXME make into a target method? */
244 int using_threads
= 1;
246 /* True if we're presently stabilizing threads (moving them out of
248 static int stabilizing_threads
;
250 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
251 int step
, int signal
, siginfo_t
*info
);
252 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
253 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
254 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
255 static void unsuspend_all_lwps (struct lwp_info
*except
);
256 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
257 int *wstat
, int options
);
258 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
259 static struct lwp_info
*add_lwp (ptid_t ptid
);
260 static void linux_mourn (struct process_info
*process
);
261 static int linux_stopped_by_watchpoint (void);
262 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
263 static int lwp_is_marked_dead (struct lwp_info
*lwp
);
264 static void proceed_all_lwps (void);
265 static int finish_step_over (struct lwp_info
*lwp
);
266 static int kill_lwp (unsigned long lwpid
, int signo
);
267 static void enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
);
268 static void complete_ongoing_step_over (void);
269 static int linux_low_ptrace_options (int attached
);
270 static int check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
);
272 /* When the event-loop is doing a step-over, this points at the thread
274 ptid_t step_over_bkpt
;
276 /* True if the low target can hardware single-step. */
279 can_hardware_single_step (void)
281 if (the_low_target
.supports_hardware_single_step
!= NULL
)
282 return the_low_target
.supports_hardware_single_step ();
287 /* True if the low target can software single-step. Such targets
288 implement the GET_NEXT_PCS callback. */
291 can_software_single_step (void)
293 return (the_low_target
.get_next_pcs
!= NULL
);
296 /* True if the low target supports memory breakpoints. If so, we'll
297 have a GET_PC implementation. */
300 supports_breakpoints (void)
302 return (the_low_target
.get_pc
!= NULL
);
305 /* Returns true if this target can support fast tracepoints. This
306 does not mean that the in-process agent has been loaded in the
310 supports_fast_tracepoints (void)
312 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
315 /* True if LWP is stopped in its stepping range. */
318 lwp_in_step_range (struct lwp_info
*lwp
)
320 CORE_ADDR pc
= lwp
->stop_pc
;
322 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
325 struct pending_signals
329 struct pending_signals
*prev
;
332 /* The read/write ends of the pipe registered as waitable file in the
334 static int linux_event_pipe
[2] = { -1, -1 };
336 /* True if we're currently in async mode. */
337 #define target_is_async_p() (linux_event_pipe[0] != -1)
339 static void send_sigstop (struct lwp_info
*lwp
);
340 static void wait_for_sigstop (void);
342 /* Return non-zero if HEADER is a 64-bit ELF file. */
345 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
347 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
348 && header
->e_ident
[EI_MAG1
] == ELFMAG1
349 && header
->e_ident
[EI_MAG2
] == ELFMAG2
350 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
352 *machine
= header
->e_machine
;
353 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
360 /* Return non-zero if FILE is a 64-bit ELF file,
361 zero if the file is not a 64-bit ELF file,
362 and -1 if the file is not accessible or doesn't exist. */
365 elf_64_file_p (const char *file
, unsigned int *machine
)
370 fd
= open (file
, O_RDONLY
);
374 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
381 return elf_64_header_p (&header
, machine
);
384 /* Accepts an integer PID; Returns true if the executable PID is
385 running is a 64-bit ELF file.. */
388 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
392 sprintf (file
, "/proc/%d/exe", pid
);
393 return elf_64_file_p (file
, machine
);
397 delete_lwp (struct lwp_info
*lwp
)
399 struct thread_info
*thr
= get_lwp_thread (lwp
);
402 debug_printf ("deleting %ld\n", lwpid_of (thr
));
405 free (lwp
->arch_private
);
409 /* Add a process to the common process list, and set its private
412 static struct process_info
*
413 linux_add_process (int pid
, int attached
)
415 struct process_info
*proc
;
417 proc
= add_process (pid
, attached
);
418 proc
->priv
= XCNEW (struct process_info_private
);
420 if (the_low_target
.new_process
!= NULL
)
421 proc
->priv
->arch_private
= the_low_target
.new_process ();
426 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
428 /* Call the target arch_setup function on the current thread. */
431 linux_arch_setup (void)
433 the_low_target
.arch_setup ();
436 /* Call the target arch_setup function on THREAD. */
439 linux_arch_setup_thread (struct thread_info
*thread
)
441 struct thread_info
*saved_thread
;
443 saved_thread
= current_thread
;
444 current_thread
= thread
;
448 current_thread
= saved_thread
;
451 /* Handle a GNU/Linux extended wait response. If we see a clone,
452 fork, or vfork event, we need to add the new LWP to our list
453 (and return 0 so as not to report the trap to higher layers).
454 If we see an exec event, we will modify ORIG_EVENT_LWP to point
455 to a new LWP representing the new program. */
458 handle_extended_wait (struct lwp_info
**orig_event_lwp
, int wstat
)
460 struct lwp_info
*event_lwp
= *orig_event_lwp
;
461 int event
= linux_ptrace_get_extended_event (wstat
);
462 struct thread_info
*event_thr
= get_lwp_thread (event_lwp
);
463 struct lwp_info
*new_lwp
;
465 gdb_assert (event_lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
467 /* All extended events we currently use are mid-syscall. Only
468 PTRACE_EVENT_STOP is delivered more like a signal-stop, but
469 you have to be using PTRACE_SEIZE to get that. */
470 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
472 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
473 || (event
== PTRACE_EVENT_CLONE
))
476 unsigned long new_pid
;
479 /* Get the pid of the new lwp. */
480 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
483 /* If we haven't already seen the new PID stop, wait for it now. */
484 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
486 /* The new child has a pending SIGSTOP. We can't affect it until it
487 hits the SIGSTOP, but we're already attached. */
489 ret
= my_waitpid (new_pid
, &status
, __WALL
);
492 perror_with_name ("waiting for new child");
493 else if (ret
!= new_pid
)
494 warning ("wait returned unexpected PID %d", ret
);
495 else if (!WIFSTOPPED (status
))
496 warning ("wait returned unexpected status 0x%x", status
);
499 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
501 struct process_info
*parent_proc
;
502 struct process_info
*child_proc
;
503 struct lwp_info
*child_lwp
;
504 struct thread_info
*child_thr
;
505 struct target_desc
*tdesc
;
507 ptid
= ptid_build (new_pid
, new_pid
, 0);
511 debug_printf ("HEW: Got fork event from LWP %ld, "
513 ptid_get_lwp (ptid_of (event_thr
)),
514 ptid_get_pid (ptid
));
517 /* Add the new process to the tables and clone the breakpoint
518 lists of the parent. We need to do this even if the new process
519 will be detached, since we will need the process object and the
520 breakpoints to remove any breakpoints from memory when we
521 detach, and the client side will access registers. */
522 child_proc
= linux_add_process (new_pid
, 0);
523 gdb_assert (child_proc
!= NULL
);
524 child_lwp
= add_lwp (ptid
);
525 gdb_assert (child_lwp
!= NULL
);
526 child_lwp
->stopped
= 1;
527 child_lwp
->must_set_ptrace_flags
= 1;
528 child_lwp
->status_pending_p
= 0;
529 child_thr
= get_lwp_thread (child_lwp
);
530 child_thr
->last_resume_kind
= resume_stop
;
531 child_thr
->last_status
.kind
= TARGET_WAITKIND_STOPPED
;
533 /* If we're suspending all threads, leave this one suspended
534 too. If the fork/clone parent is stepping over a breakpoint,
535 all other threads have been suspended already. Leave the
536 child suspended too. */
537 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
538 || event_lwp
->bp_reinsert
!= 0)
541 debug_printf ("HEW: leaving child suspended\n");
542 child_lwp
->suspended
= 1;
545 parent_proc
= get_thread_process (event_thr
);
546 child_proc
->attached
= parent_proc
->attached
;
548 if (event_lwp
->bp_reinsert
!= 0
549 && can_software_single_step ()
550 && event
== PTRACE_EVENT_VFORK
)
552 struct thread_info
*saved_thread
= current_thread
;
554 current_thread
= event_thr
;
555 /* If we leave reinsert breakpoints there, child will
556 hit it, so uninsert reinsert breakpoints from parent
557 (and child). Once vfork child is done, reinsert
558 them back to parent. */
559 uninsert_reinsert_breakpoints ();
560 current_thread
= saved_thread
;
563 clone_all_breakpoints (child_thr
, event_thr
);
565 tdesc
= XNEW (struct target_desc
);
566 copy_target_description (tdesc
, parent_proc
->tdesc
);
567 child_proc
->tdesc
= tdesc
;
569 /* Clone arch-specific process data. */
570 if (the_low_target
.new_fork
!= NULL
)
571 the_low_target
.new_fork (parent_proc
, child_proc
);
573 /* Save fork info in the parent thread. */
574 if (event
== PTRACE_EVENT_FORK
)
575 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
576 else if (event
== PTRACE_EVENT_VFORK
)
577 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
579 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
581 /* The status_pending field contains bits denoting the
582 extended event, so when the pending event is handled,
583 the handler will look at lwp->waitstatus. */
584 event_lwp
->status_pending_p
= 1;
585 event_lwp
->status_pending
= wstat
;
587 /* If the parent thread is doing step-over with reinsert
588 breakpoints, the list of reinsert breakpoints are cloned
589 from the parent's. Remove them from the child process.
590 In case of vfork, we'll reinsert them back once vforked
592 if (event_lwp
->bp_reinsert
!= 0
593 && can_software_single_step ())
595 struct thread_info
*saved_thread
= current_thread
;
597 /* The child process is forked and stopped, so it is safe
598 to access its memory without stopping all other threads
599 from other processes. */
600 current_thread
= child_thr
;
601 delete_reinsert_breakpoints ();
602 current_thread
= saved_thread
;
604 gdb_assert (has_reinsert_breakpoints (parent_proc
));
605 gdb_assert (!has_reinsert_breakpoints (child_proc
));
608 /* Report the event. */
613 debug_printf ("HEW: Got clone event "
614 "from LWP %ld, new child is LWP %ld\n",
615 lwpid_of (event_thr
), new_pid
);
617 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
618 new_lwp
= add_lwp (ptid
);
620 /* Either we're going to immediately resume the new thread
621 or leave it stopped. linux_resume_one_lwp is a nop if it
622 thinks the thread is currently running, so set this first
623 before calling linux_resume_one_lwp. */
624 new_lwp
->stopped
= 1;
626 /* If we're suspending all threads, leave this one suspended
627 too. If the fork/clone parent is stepping over a breakpoint,
628 all other threads have been suspended already. Leave the
629 child suspended too. */
630 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
631 || event_lwp
->bp_reinsert
!= 0)
632 new_lwp
->suspended
= 1;
634 /* Normally we will get the pending SIGSTOP. But in some cases
635 we might get another signal delivered to the group first.
636 If we do get another signal, be sure not to lose it. */
637 if (WSTOPSIG (status
) != SIGSTOP
)
639 new_lwp
->stop_expected
= 1;
640 new_lwp
->status_pending_p
= 1;
641 new_lwp
->status_pending
= status
;
643 else if (report_thread_events
)
645 new_lwp
->waitstatus
.kind
= TARGET_WAITKIND_THREAD_CREATED
;
646 new_lwp
->status_pending_p
= 1;
647 new_lwp
->status_pending
= status
;
650 /* Don't report the event. */
653 else if (event
== PTRACE_EVENT_VFORK_DONE
)
655 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
657 if (event_lwp
->bp_reinsert
!= 0 && can_software_single_step ())
659 struct thread_info
*saved_thread
= current_thread
;
660 struct process_info
*proc
= get_thread_process (event_thr
);
662 current_thread
= event_thr
;
663 reinsert_reinsert_breakpoints ();
664 current_thread
= saved_thread
;
666 gdb_assert (has_reinsert_breakpoints (proc
));
669 /* Report the event. */
672 else if (event
== PTRACE_EVENT_EXEC
&& report_exec_events
)
674 struct process_info
*proc
;
675 VEC (int) *syscalls_to_catch
;
681 debug_printf ("HEW: Got exec event from LWP %ld\n",
682 lwpid_of (event_thr
));
685 /* Get the event ptid. */
686 event_ptid
= ptid_of (event_thr
);
687 event_pid
= ptid_get_pid (event_ptid
);
689 /* Save the syscall list from the execing process. */
690 proc
= get_thread_process (event_thr
);
691 syscalls_to_catch
= proc
->syscalls_to_catch
;
692 proc
->syscalls_to_catch
= NULL
;
694 /* Delete the execing process and all its threads. */
696 current_thread
= NULL
;
698 /* Create a new process/lwp/thread. */
699 proc
= linux_add_process (event_pid
, 0);
700 event_lwp
= add_lwp (event_ptid
);
701 event_thr
= get_lwp_thread (event_lwp
);
702 gdb_assert (current_thread
== event_thr
);
703 linux_arch_setup_thread (event_thr
);
705 /* Set the event status. */
706 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
707 event_lwp
->waitstatus
.value
.execd_pathname
708 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
710 /* Mark the exec status as pending. */
711 event_lwp
->stopped
= 1;
712 event_lwp
->status_pending_p
= 1;
713 event_lwp
->status_pending
= wstat
;
714 event_thr
->last_resume_kind
= resume_continue
;
715 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
717 /* Update syscall state in the new lwp, effectively mid-syscall too. */
718 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
720 /* Restore the list to catch. Don't rely on the client, which is free
721 to avoid sending a new list when the architecture doesn't change.
722 Also, for ANY_SYSCALL, the architecture doesn't really matter. */
723 proc
->syscalls_to_catch
= syscalls_to_catch
;
725 /* Report the event. */
726 *orig_event_lwp
= event_lwp
;
730 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
733 /* Return the PC as read from the regcache of LWP, without any
737 get_pc (struct lwp_info
*lwp
)
739 struct thread_info
*saved_thread
;
740 struct regcache
*regcache
;
743 if (the_low_target
.get_pc
== NULL
)
746 saved_thread
= current_thread
;
747 current_thread
= get_lwp_thread (lwp
);
749 regcache
= get_thread_regcache (current_thread
, 1);
750 pc
= (*the_low_target
.get_pc
) (regcache
);
753 debug_printf ("pc is 0x%lx\n", (long) pc
);
755 current_thread
= saved_thread
;
759 /* This function should only be called if LWP got a SYSCALL_SIGTRAP.
760 Fill *SYSNO with the syscall nr trapped. */
763 get_syscall_trapinfo (struct lwp_info
*lwp
, int *sysno
)
765 struct thread_info
*saved_thread
;
766 struct regcache
*regcache
;
768 if (the_low_target
.get_syscall_trapinfo
== NULL
)
770 /* If we cannot get the syscall trapinfo, report an unknown
771 system call number. */
772 *sysno
= UNKNOWN_SYSCALL
;
776 saved_thread
= current_thread
;
777 current_thread
= get_lwp_thread (lwp
);
779 regcache
= get_thread_regcache (current_thread
, 1);
780 (*the_low_target
.get_syscall_trapinfo
) (regcache
, sysno
);
783 debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno
);
785 current_thread
= saved_thread
;
788 static int check_stopped_by_watchpoint (struct lwp_info
*child
);
790 /* Called when the LWP stopped for a signal/trap. If it stopped for a
791 trap check what caused it (breakpoint, watchpoint, trace, etc.),
792 and save the result in the LWP's stop_reason field. If it stopped
793 for a breakpoint, decrement the PC if necessary on the lwp's
794 architecture. Returns true if we now have the LWP's stop PC. */
797 save_stop_reason (struct lwp_info
*lwp
)
800 CORE_ADDR sw_breakpoint_pc
;
801 struct thread_info
*saved_thread
;
802 #if USE_SIGTRAP_SIGINFO
806 if (the_low_target
.get_pc
== NULL
)
810 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
812 /* breakpoint_at reads from the current thread. */
813 saved_thread
= current_thread
;
814 current_thread
= get_lwp_thread (lwp
);
816 #if USE_SIGTRAP_SIGINFO
817 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
818 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
820 if (siginfo
.si_signo
== SIGTRAP
)
822 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
)
823 && GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
825 /* The si_code is ambiguous on this arch -- check debug
827 if (!check_stopped_by_watchpoint (lwp
))
828 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
830 else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
832 /* If we determine the LWP stopped for a SW breakpoint,
833 trust it. Particularly don't check watchpoint
834 registers, because at least on s390, we'd find
835 stopped-by-watchpoint as long as there's a watchpoint
837 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
839 else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
841 /* This can indicate either a hardware breakpoint or
842 hardware watchpoint. Check debug registers. */
843 if (!check_stopped_by_watchpoint (lwp
))
844 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
846 else if (siginfo
.si_code
== TRAP_TRACE
)
848 /* We may have single stepped an instruction that
849 triggered a watchpoint. In that case, on some
850 architectures (such as x86), instead of TRAP_HWBKPT,
851 si_code indicates TRAP_TRACE, and we need to check
852 the debug registers separately. */
853 if (!check_stopped_by_watchpoint (lwp
))
854 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
859 /* We may have just stepped a breakpoint instruction. E.g., in
860 non-stop mode, GDB first tells the thread A to step a range, and
861 then the user inserts a breakpoint inside the range. In that
862 case we need to report the breakpoint PC. */
863 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
864 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
865 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
867 if (hardware_breakpoint_inserted_here (pc
))
868 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
870 if (lwp
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
)
871 check_stopped_by_watchpoint (lwp
);
874 if (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
878 struct thread_info
*thr
= get_lwp_thread (lwp
);
880 debug_printf ("CSBB: %s stopped by software breakpoint\n",
881 target_pid_to_str (ptid_of (thr
)));
884 /* Back up the PC if necessary. */
885 if (pc
!= sw_breakpoint_pc
)
887 struct regcache
*regcache
888 = get_thread_regcache (current_thread
, 1);
889 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
892 /* Update this so we record the correct stop PC below. */
893 pc
= sw_breakpoint_pc
;
895 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
)
899 struct thread_info
*thr
= get_lwp_thread (lwp
);
901 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
902 target_pid_to_str (ptid_of (thr
)));
905 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
909 struct thread_info
*thr
= get_lwp_thread (lwp
);
911 debug_printf ("CSBB: %s stopped by hardware watchpoint\n",
912 target_pid_to_str (ptid_of (thr
)));
915 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
)
919 struct thread_info
*thr
= get_lwp_thread (lwp
);
921 debug_printf ("CSBB: %s stopped by trace\n",
922 target_pid_to_str (ptid_of (thr
)));
927 current_thread
= saved_thread
;
931 static struct lwp_info
*
932 add_lwp (ptid_t ptid
)
934 struct lwp_info
*lwp
;
936 lwp
= XCNEW (struct lwp_info
);
938 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
940 if (the_low_target
.new_thread
!= NULL
)
941 the_low_target
.new_thread (lwp
);
943 lwp
->thread
= add_thread (ptid
, lwp
);
948 /* Start an inferior process and returns its pid.
949 ALLARGS is a vector of program-name and args. */
952 linux_create_inferior (char *program
, char **allargs
)
954 struct lwp_info
*new_lwp
;
957 struct cleanup
*restore_personality
958 = maybe_disable_address_space_randomization (disable_randomization
);
960 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
966 perror_with_name ("fork");
971 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
975 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
976 stdout to stderr so that inferior i/o doesn't corrupt the connection.
977 Also, redirect stdin to /dev/null. */
978 if (remote_connection_is_stdio ())
981 open ("/dev/null", O_RDONLY
);
983 if (write (2, "stdin/stdout redirected\n",
984 sizeof ("stdin/stdout redirected\n") - 1) < 0)
986 /* Errors ignored. */;
990 execv (program
, allargs
);
992 execvp (program
, allargs
);
994 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
1000 do_cleanups (restore_personality
);
1002 linux_add_process (pid
, 0);
1004 ptid
= ptid_build (pid
, pid
, 0);
1005 new_lwp
= add_lwp (ptid
);
1006 new_lwp
->must_set_ptrace_flags
= 1;
1011 /* Implement the post_create_inferior target_ops method. */
1014 linux_post_create_inferior (void)
1016 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
1018 linux_arch_setup ();
1020 if (lwp
->must_set_ptrace_flags
)
1022 struct process_info
*proc
= current_process ();
1023 int options
= linux_low_ptrace_options (proc
->attached
);
1025 linux_enable_event_reporting (lwpid_of (current_thread
), options
);
1026 lwp
->must_set_ptrace_flags
= 0;
1030 /* Attach to an inferior process. Returns 0 on success, ERRNO on
1034 linux_attach_lwp (ptid_t ptid
)
1036 struct lwp_info
*new_lwp
;
1037 int lwpid
= ptid_get_lwp (ptid
);
1039 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
1043 new_lwp
= add_lwp (ptid
);
1045 /* We need to wait for SIGSTOP before being able to make the next
1046 ptrace call on this LWP. */
1047 new_lwp
->must_set_ptrace_flags
= 1;
1049 if (linux_proc_pid_is_stopped (lwpid
))
1052 debug_printf ("Attached to a stopped process\n");
1054 /* The process is definitely stopped. It is in a job control
1055 stop, unless the kernel predates the TASK_STOPPED /
1056 TASK_TRACED distinction, in which case it might be in a
1057 ptrace stop. Make sure it is in a ptrace stop; from there we
1058 can kill it, signal it, et cetera.
1060 First make sure there is a pending SIGSTOP. Since we are
1061 already attached, the process can not transition from stopped
1062 to running without a PTRACE_CONT; so we know this signal will
1063 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1064 probably already in the queue (unless this kernel is old
1065 enough to use TASK_STOPPED for ptrace stops); but since
1066 SIGSTOP is not an RT signal, it can only be queued once. */
1067 kill_lwp (lwpid
, SIGSTOP
);
1069 /* Finally, resume the stopped process. This will deliver the
1070 SIGSTOP (or a higher priority signal, just like normal
1071 PTRACE_ATTACH), which we'll catch later on. */
1072 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1075 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
1076 brings it to a halt.
1078 There are several cases to consider here:
1080 1) gdbserver has already attached to the process and is being notified
1081 of a new thread that is being created.
1082 In this case we should ignore that SIGSTOP and resume the
1083 process. This is handled below by setting stop_expected = 1,
1084 and the fact that add_thread sets last_resume_kind ==
1087 2) This is the first thread (the process thread), and we're attaching
1088 to it via attach_inferior.
1089 In this case we want the process thread to stop.
1090 This is handled by having linux_attach set last_resume_kind ==
1091 resume_stop after we return.
1093 If the pid we are attaching to is also the tgid, we attach to and
1094 stop all the existing threads. Otherwise, we attach to pid and
1095 ignore any other threads in the same group as this pid.
1097 3) GDB is connecting to gdbserver and is requesting an enumeration of all
1099 In this case we want the thread to stop.
1100 FIXME: This case is currently not properly handled.
1101 We should wait for the SIGSTOP but don't. Things work apparently
1102 because enough time passes between when we ptrace (ATTACH) and when
1103 gdb makes the next ptrace call on the thread.
1105 On the other hand, if we are currently trying to stop all threads, we
1106 should treat the new thread as if we had sent it a SIGSTOP. This works
1107 because we are guaranteed that the add_lwp call above added us to the
1108 end of the list, and so the new thread has not yet reached
1109 wait_for_sigstop (but will). */
1110 new_lwp
->stop_expected
= 1;
1115 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
1116 already attached. Returns true if a new LWP is found, false
1120 attach_proc_task_lwp_callback (ptid_t ptid
)
1122 /* Is this a new thread? */
1123 if (find_thread_ptid (ptid
) == NULL
)
1125 int lwpid
= ptid_get_lwp (ptid
);
1129 debug_printf ("Found new lwp %d\n", lwpid
);
1131 err
= linux_attach_lwp (ptid
);
1133 /* Be quiet if we simply raced with the thread exiting. EPERM
1134 is returned if the thread's task still exists, and is marked
1135 as exited or zombie, as well as other conditions, so in that
1136 case, confirm the status in /proc/PID/status. */
1138 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1142 debug_printf ("Cannot attach to lwp %d: "
1143 "thread is gone (%d: %s)\n",
1144 lwpid
, err
, strerror (err
));
1149 warning (_("Cannot attach to lwp %d: %s"),
1151 linux_ptrace_attach_fail_reason_string (ptid
, err
));
1159 static void async_file_mark (void);
1161 /* Attach to PID. If PID is the tgid, attach to it and all
1165 linux_attach (unsigned long pid
)
1167 struct process_info
*proc
;
1168 struct thread_info
*initial_thread
;
1169 ptid_t ptid
= ptid_build (pid
, pid
, 0);
1172 /* Attach to PID. We will check for other threads
1174 err
= linux_attach_lwp (ptid
);
1176 error ("Cannot attach to process %ld: %s",
1177 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
1179 proc
= linux_add_process (pid
, 1);
1181 /* Don't ignore the initial SIGSTOP if we just attached to this
1182 process. It will be collected by wait shortly. */
1183 initial_thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
1184 initial_thread
->last_resume_kind
= resume_stop
;
1186 /* We must attach to every LWP. If /proc is mounted, use that to
1187 find them now. On the one hand, the inferior may be using raw
1188 clone instead of using pthreads. On the other hand, even if it
1189 is using pthreads, GDB may not be connected yet (thread_db needs
1190 to do symbol lookups, through qSymbol). Also, thread_db walks
1191 structures in the inferior's address space to find the list of
1192 threads/LWPs, and those structures may well be corrupted. Note
1193 that once thread_db is loaded, we'll still use it to list threads
1194 and associate pthread info with each LWP. */
1195 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1197 /* GDB will shortly read the xml target description for this
1198 process, to figure out the process' architecture. But the target
1199 description is only filled in when the first process/thread in
1200 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1201 that now, otherwise, if GDB is fast enough, it could read the
1202 target description _before_ that initial stop. */
1205 struct lwp_info
*lwp
;
1207 ptid_t pid_ptid
= pid_to_ptid (pid
);
1209 lwpid
= linux_wait_for_event_filtered (pid_ptid
, pid_ptid
,
1211 gdb_assert (lwpid
> 0);
1213 lwp
= find_lwp_pid (pid_to_ptid (lwpid
));
1215 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGSTOP
)
1217 lwp
->status_pending_p
= 1;
1218 lwp
->status_pending
= wstat
;
1221 initial_thread
->last_resume_kind
= resume_continue
;
1225 gdb_assert (proc
->tdesc
!= NULL
);
1238 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
1240 struct counter
*counter
= (struct counter
*) args
;
1242 if (ptid_get_pid (entry
->id
) == counter
->pid
)
1244 if (++counter
->count
> 1)
1252 last_thread_of_process_p (int pid
)
1254 struct counter counter
= { pid
, 0 };
1256 return (find_inferior (&all_threads
,
1257 second_thread_of_pid_p
, &counter
) == NULL
);
1263 linux_kill_one_lwp (struct lwp_info
*lwp
)
1265 struct thread_info
*thr
= get_lwp_thread (lwp
);
1266 int pid
= lwpid_of (thr
);
1268 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1269 there is no signal context, and ptrace(PTRACE_KILL) (or
1270 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1271 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1272 alternative is to kill with SIGKILL. We only need one SIGKILL
1273 per process, not one for each thread. But since we still support
1274 support debugging programs using raw clone without CLONE_THREAD,
1275 we send one for each thread. For years, we used PTRACE_KILL
1276 only, so we're being a bit paranoid about some old kernels where
1277 PTRACE_KILL might work better (dubious if there are any such, but
1278 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1279 second, and so we're fine everywhere. */
1282 kill_lwp (pid
, SIGKILL
);
1285 int save_errno
= errno
;
1287 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1288 target_pid_to_str (ptid_of (thr
)),
1289 save_errno
? strerror (save_errno
) : "OK");
1293 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1296 int save_errno
= errno
;
1298 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1299 target_pid_to_str (ptid_of (thr
)),
1300 save_errno
? strerror (save_errno
) : "OK");
1304 /* Kill LWP and wait for it to die. */
1307 kill_wait_lwp (struct lwp_info
*lwp
)
1309 struct thread_info
*thr
= get_lwp_thread (lwp
);
1310 int pid
= ptid_get_pid (ptid_of (thr
));
1311 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1316 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1320 linux_kill_one_lwp (lwp
);
1322 /* Make sure it died. Notes:
1324 - The loop is most likely unnecessary.
1326 - We don't use linux_wait_for_event as that could delete lwps
1327 while we're iterating over them. We're not interested in
1328 any pending status at this point, only in making sure all
1329 wait status on the kernel side are collected until the
1332 - We don't use __WALL here as the __WALL emulation relies on
1333 SIGCHLD, and killing a stopped process doesn't generate
1334 one, nor an exit status.
1336 res
= my_waitpid (lwpid
, &wstat
, 0);
1337 if (res
== -1 && errno
== ECHILD
)
1338 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1339 } while (res
> 0 && WIFSTOPPED (wstat
));
1341 /* Even if it was stopped, the child may have already disappeared.
1342 E.g., if it was killed by SIGKILL. */
1343 if (res
< 0 && errno
!= ECHILD
)
1344 perror_with_name ("kill_wait_lwp");
1347 /* Callback for `find_inferior'. Kills an lwp of a given process,
1348 except the leader. */
1351 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1353 struct thread_info
*thread
= (struct thread_info
*) entry
;
1354 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1355 int pid
= * (int *) args
;
1357 if (ptid_get_pid (entry
->id
) != pid
)
1360 /* We avoid killing the first thread here, because of a Linux kernel (at
1361 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1362 the children get a chance to be reaped, it will remain a zombie
1365 if (lwpid_of (thread
) == pid
)
1368 debug_printf ("lkop: is last of process %s\n",
1369 target_pid_to_str (entry
->id
));
1373 kill_wait_lwp (lwp
);
1378 linux_kill (int pid
)
1380 struct process_info
*process
;
1381 struct lwp_info
*lwp
;
1383 process
= find_process_pid (pid
);
1384 if (process
== NULL
)
1387 /* If we're killing a running inferior, make sure it is stopped
1388 first, as PTRACE_KILL will not work otherwise. */
1389 stop_all_lwps (0, NULL
);
1391 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1393 /* See the comment in linux_kill_one_lwp. We did not kill the first
1394 thread in the list, so do so now. */
1395 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1400 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1404 kill_wait_lwp (lwp
);
1406 the_target
->mourn (process
);
1408 /* Since we presently can only stop all lwps of all processes, we
1409 need to unstop lwps of other processes. */
1410 unstop_all_lwps (0, NULL
);
1414 /* Get pending signal of THREAD, for detaching purposes. This is the
1415 signal the thread last stopped for, which we need to deliver to the
1416 thread when detaching, otherwise, it'd be suppressed/lost. */
1419 get_detach_signal (struct thread_info
*thread
)
1421 enum gdb_signal signo
= GDB_SIGNAL_0
;
1423 struct lwp_info
*lp
= get_thread_lwp (thread
);
1425 if (lp
->status_pending_p
)
1426 status
= lp
->status_pending
;
1429 /* If the thread had been suspended by gdbserver, and it stopped
1430 cleanly, then it'll have stopped with SIGSTOP. But we don't
1431 want to deliver that SIGSTOP. */
1432 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1433 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1436 /* Otherwise, we may need to deliver the signal we
1438 status
= lp
->last_status
;
1441 if (!WIFSTOPPED (status
))
1444 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1445 target_pid_to_str (ptid_of (thread
)));
1449 /* Extended wait statuses aren't real SIGTRAPs. */
1450 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1453 debug_printf ("GPS: lwp %s had stopped with extended "
1454 "status: no pending signal\n",
1455 target_pid_to_str (ptid_of (thread
)));
1459 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1461 if (program_signals_p
&& !program_signals
[signo
])
1464 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1465 target_pid_to_str (ptid_of (thread
)),
1466 gdb_signal_to_string (signo
));
1469 else if (!program_signals_p
1470 /* If we have no way to know which signals GDB does not
1471 want to have passed to the program, assume
1472 SIGTRAP/SIGINT, which is GDB's default. */
1473 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1476 debug_printf ("GPS: lwp %s had signal %s, "
1477 "but we don't know if we should pass it. "
1478 "Default to not.\n",
1479 target_pid_to_str (ptid_of (thread
)),
1480 gdb_signal_to_string (signo
));
1486 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1487 target_pid_to_str (ptid_of (thread
)),
1488 gdb_signal_to_string (signo
));
1490 return WSTOPSIG (status
);
1494 /* Detach from LWP. */
1497 linux_detach_one_lwp (struct lwp_info
*lwp
)
1499 struct thread_info
*thread
= get_lwp_thread (lwp
);
1503 /* If there is a pending SIGSTOP, get rid of it. */
1504 if (lwp
->stop_expected
)
1507 debug_printf ("Sending SIGCONT to %s\n",
1508 target_pid_to_str (ptid_of (thread
)));
1510 kill_lwp (lwpid_of (thread
), SIGCONT
);
1511 lwp
->stop_expected
= 0;
1514 /* Pass on any pending signal for this thread. */
1515 sig
= get_detach_signal (thread
);
1517 /* Preparing to resume may try to write registers, and fail if the
1518 lwp is zombie. If that happens, ignore the error. We'll handle
1519 it below, when detach fails with ESRCH. */
1522 /* Flush any pending changes to the process's registers. */
1523 regcache_invalidate_thread (thread
);
1525 /* Finally, let it resume. */
1526 if (the_low_target
.prepare_to_resume
!= NULL
)
1527 the_low_target
.prepare_to_resume (lwp
);
1529 CATCH (ex
, RETURN_MASK_ERROR
)
1531 if (!check_ptrace_stopped_lwp_gone (lwp
))
1532 throw_exception (ex
);
1536 lwpid
= lwpid_of (thread
);
1537 if (ptrace (PTRACE_DETACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0,
1538 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1540 int save_errno
= errno
;
1542 /* We know the thread exists, so ESRCH must mean the lwp is
1543 zombie. This can happen if one of the already-detached
1544 threads exits the whole thread group. In that case we're
1545 still attached, and must reap the lwp. */
1546 if (save_errno
== ESRCH
)
1550 ret
= my_waitpid (lwpid
, &status
, __WALL
);
1553 warning (_("Couldn't reap LWP %d while detaching: %s"),
1554 lwpid
, strerror (errno
));
1556 else if (!WIFEXITED (status
) && !WIFSIGNALED (status
))
1558 warning (_("Reaping LWP %d while detaching "
1559 "returned unexpected status 0x%x"),
1565 error (_("Can't detach %s: %s"),
1566 target_pid_to_str (ptid_of (thread
)),
1567 strerror (save_errno
));
1570 else if (debug_threads
)
1572 debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n",
1573 target_pid_to_str (ptid_of (thread
)),
1580 /* Callback for find_inferior. Detaches from non-leader threads of a
1584 linux_detach_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1586 struct thread_info
*thread
= (struct thread_info
*) entry
;
1587 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1588 int pid
= *(int *) args
;
1589 int lwpid
= lwpid_of (thread
);
1591 /* Skip other processes. */
1592 if (ptid_get_pid (entry
->id
) != pid
)
1595 /* We don't actually detach from the thread group leader just yet.
1596 If the thread group exits, we must reap the zombie clone lwps
1597 before we're able to reap the leader. */
1598 if (ptid_get_pid (entry
->id
) == lwpid
)
1601 linux_detach_one_lwp (lwp
);
1606 linux_detach (int pid
)
1608 struct process_info
*process
;
1609 struct lwp_info
*main_lwp
;
1611 process
= find_process_pid (pid
);
1612 if (process
== NULL
)
1615 /* As there's a step over already in progress, let it finish first,
1616 otherwise nesting a stabilize_threads operation on top gets real
1618 complete_ongoing_step_over ();
1620 /* Stop all threads before detaching. First, ptrace requires that
1621 the thread is stopped to sucessfully detach. Second, thread_db
1622 may need to uninstall thread event breakpoints from memory, which
1623 only works with a stopped process anyway. */
1624 stop_all_lwps (0, NULL
);
1626 #ifdef USE_THREAD_DB
1627 thread_db_detach (process
);
1630 /* Stabilize threads (move out of jump pads). */
1631 stabilize_threads ();
1633 /* Detach from the clone lwps first. If the thread group exits just
1634 while we're detaching, we must reap the clone lwps before we're
1635 able to reap the leader. */
1636 find_inferior (&all_threads
, linux_detach_lwp_callback
, &pid
);
1638 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1639 linux_detach_one_lwp (main_lwp
);
1641 the_target
->mourn (process
);
1643 /* Since we presently can only stop all lwps of all processes, we
1644 need to unstop lwps of other processes. */
1645 unstop_all_lwps (0, NULL
);
1649 /* Remove all LWPs that belong to process PROC from the lwp list. */
1652 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1654 struct thread_info
*thread
= (struct thread_info
*) entry
;
1655 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1656 struct process_info
*process
= (struct process_info
*) proc
;
1658 if (pid_of (thread
) == pid_of (process
))
1665 linux_mourn (struct process_info
*process
)
1667 struct process_info_private
*priv
;
1669 #ifdef USE_THREAD_DB
1670 thread_db_mourn (process
);
1673 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1675 /* Freeing all private data. */
1676 priv
= process
->priv
;
1677 free (priv
->arch_private
);
1679 process
->priv
= NULL
;
1681 remove_process (process
);
1685 linux_join (int pid
)
1690 ret
= my_waitpid (pid
, &status
, 0);
1691 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1693 } while (ret
!= -1 || errno
!= ECHILD
);
1696 /* Return nonzero if the given thread is still alive. */
1698 linux_thread_alive (ptid_t ptid
)
1700 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1702 /* We assume we always know if a thread exits. If a whole process
1703 exited but we still haven't been able to report it to GDB, we'll
1704 hold on to the last lwp of the dead process. */
1706 return !lwp_is_marked_dead (lwp
);
1711 /* Return 1 if this lwp still has an interesting status pending. If
1712 not (e.g., it had stopped for a breakpoint that is gone), return
1716 thread_still_has_status_pending_p (struct thread_info
*thread
)
1718 struct lwp_info
*lp
= get_thread_lwp (thread
);
1720 if (!lp
->status_pending_p
)
1723 if (thread
->last_resume_kind
!= resume_stop
1724 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1725 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1727 struct thread_info
*saved_thread
;
1731 gdb_assert (lp
->last_status
!= 0);
1735 saved_thread
= current_thread
;
1736 current_thread
= thread
;
1738 if (pc
!= lp
->stop_pc
)
1741 debug_printf ("PC of %ld changed\n",
1746 #if !USE_SIGTRAP_SIGINFO
1747 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1748 && !(*the_low_target
.breakpoint_at
) (pc
))
1751 debug_printf ("previous SW breakpoint of %ld gone\n",
1755 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1756 && !hardware_breakpoint_inserted_here (pc
))
1759 debug_printf ("previous HW breakpoint of %ld gone\n",
1765 current_thread
= saved_thread
;
1770 debug_printf ("discarding pending breakpoint status\n");
1771 lp
->status_pending_p
= 0;
1779 /* Returns true if LWP is resumed from the client's perspective. */
1782 lwp_resumed (struct lwp_info
*lwp
)
1784 struct thread_info
*thread
= get_lwp_thread (lwp
);
1786 if (thread
->last_resume_kind
!= resume_stop
)
1789 /* Did gdb send us a `vCont;t', but we haven't reported the
1790 corresponding stop to gdb yet? If so, the thread is still
1791 resumed/running from gdb's perspective. */
1792 if (thread
->last_resume_kind
== resume_stop
1793 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1799 /* Return 1 if this lwp has an interesting status pending. */
1801 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1803 struct thread_info
*thread
= (struct thread_info
*) entry
;
1804 struct lwp_info
*lp
= get_thread_lwp (thread
);
1805 ptid_t ptid
= * (ptid_t
*) arg
;
1807 /* Check if we're only interested in events from a specific process
1808 or a specific LWP. */
1809 if (!ptid_match (ptid_of (thread
), ptid
))
1812 if (!lwp_resumed (lp
))
1815 if (lp
->status_pending_p
1816 && !thread_still_has_status_pending_p (thread
))
1818 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1822 return lp
->status_pending_p
;
1826 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1828 ptid_t ptid
= *(ptid_t
*) data
;
1831 if (ptid_get_lwp (ptid
) != 0)
1832 lwp
= ptid_get_lwp (ptid
);
1834 lwp
= ptid_get_pid (ptid
);
1836 if (ptid_get_lwp (entry
->id
) == lwp
)
1843 find_lwp_pid (ptid_t ptid
)
1845 struct inferior_list_entry
*thread
1846 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1851 return get_thread_lwp ((struct thread_info
*) thread
);
1854 /* Return the number of known LWPs in the tgid given by PID. */
1859 struct inferior_list_entry
*inf
, *tmp
;
1862 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1864 if (ptid_get_pid (inf
->id
) == pid
)
1871 /* The arguments passed to iterate_over_lwps. */
1873 struct iterate_over_lwps_args
1875 /* The FILTER argument passed to iterate_over_lwps. */
1878 /* The CALLBACK argument passed to iterate_over_lwps. */
1879 iterate_over_lwps_ftype
*callback
;
1881 /* The DATA argument passed to iterate_over_lwps. */
1885 /* Callback for find_inferior used by iterate_over_lwps to filter
1886 calls to the callback supplied to that function. Returning a
1887 nonzero value causes find_inferiors to stop iterating and return
1888 the current inferior_list_entry. Returning zero indicates that
1889 find_inferiors should continue iterating. */
1892 iterate_over_lwps_filter (struct inferior_list_entry
*entry
, void *args_p
)
1894 struct iterate_over_lwps_args
*args
1895 = (struct iterate_over_lwps_args
*) args_p
;
1897 if (ptid_match (entry
->id
, args
->filter
))
1899 struct thread_info
*thr
= (struct thread_info
*) entry
;
1900 struct lwp_info
*lwp
= get_thread_lwp (thr
);
1902 return (*args
->callback
) (lwp
, args
->data
);
1908 /* See nat/linux-nat.h. */
1911 iterate_over_lwps (ptid_t filter
,
1912 iterate_over_lwps_ftype callback
,
1915 struct iterate_over_lwps_args args
= {filter
, callback
, data
};
1916 struct inferior_list_entry
*entry
;
1918 entry
= find_inferior (&all_threads
, iterate_over_lwps_filter
, &args
);
1922 return get_thread_lwp ((struct thread_info
*) entry
);
1925 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1926 their exits until all other threads in the group have exited. */
1929 check_zombie_leaders (void)
1931 struct process_info
*proc
, *tmp
;
1933 ALL_PROCESSES (proc
, tmp
)
1935 pid_t leader_pid
= pid_of (proc
);
1936 struct lwp_info
*leader_lp
;
1938 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1941 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1942 "num_lwps=%d, zombie=%d\n",
1943 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1944 linux_proc_pid_is_zombie (leader_pid
));
1946 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1947 /* Check if there are other threads in the group, as we may
1948 have raced with the inferior simply exiting. */
1949 && !last_thread_of_process_p (leader_pid
)
1950 && linux_proc_pid_is_zombie (leader_pid
))
1952 /* A leader zombie can mean one of two things:
1954 - It exited, and there's an exit status pending
1955 available, or only the leader exited (not the whole
1956 program). In the latter case, we can't waitpid the
1957 leader's exit status until all other threads are gone.
1959 - There are 3 or more threads in the group, and a thread
1960 other than the leader exec'd. On an exec, the Linux
1961 kernel destroys all other threads (except the execing
1962 one) in the thread group, and resets the execing thread's
1963 tid to the tgid. No exit notification is sent for the
1964 execing thread -- from the ptracer's perspective, it
1965 appears as though the execing thread just vanishes.
1966 Until we reap all other threads except the leader and the
1967 execing thread, the leader will be zombie, and the
1968 execing thread will be in `D (disc sleep)'. As soon as
1969 all other threads are reaped, the execing thread changes
1970 it's tid to the tgid, and the previous (zombie) leader
1971 vanishes, giving place to the "new" leader. We could try
1972 distinguishing the exit and exec cases, by waiting once
1973 more, and seeing if something comes out, but it doesn't
1974 sound useful. The previous leader _does_ go away, and
1975 we'll re-add the new one once we see the exec event
1976 (which is just the same as what would happen if the
1977 previous leader did exit voluntarily before some other
1982 "CZL: Thread group leader %d zombie "
1983 "(it exited, or another thread execd).\n",
1986 delete_lwp (leader_lp
);
1991 /* Callback for `find_inferior'. Returns the first LWP that is not
1992 stopped. ARG is a PTID filter. */
1995 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
1997 struct thread_info
*thr
= (struct thread_info
*) entry
;
1998 struct lwp_info
*lwp
;
1999 ptid_t filter
= *(ptid_t
*) arg
;
2001 if (!ptid_match (ptid_of (thr
), filter
))
2004 lwp
= get_thread_lwp (thr
);
2011 /* Increment LWP's suspend count. */
2014 lwp_suspended_inc (struct lwp_info
*lwp
)
2018 if (debug_threads
&& lwp
->suspended
> 4)
2020 struct thread_info
*thread
= get_lwp_thread (lwp
);
2022 debug_printf ("LWP %ld has a suspiciously high suspend count,"
2023 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
2027 /* Decrement LWP's suspend count. */
2030 lwp_suspended_decr (struct lwp_info
*lwp
)
2034 if (lwp
->suspended
< 0)
2036 struct thread_info
*thread
= get_lwp_thread (lwp
);
2038 internal_error (__FILE__
, __LINE__
,
2039 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
2044 /* This function should only be called if the LWP got a SIGTRAP.
2046 Handle any tracepoint steps or hits. Return true if a tracepoint
2047 event was handled, 0 otherwise. */
2050 handle_tracepoints (struct lwp_info
*lwp
)
2052 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
2053 int tpoint_related_event
= 0;
2055 gdb_assert (lwp
->suspended
== 0);
2057 /* If this tracepoint hit causes a tracing stop, we'll immediately
2058 uninsert tracepoints. To do this, we temporarily pause all
2059 threads, unpatch away, and then unpause threads. We need to make
2060 sure the unpausing doesn't resume LWP too. */
2061 lwp_suspended_inc (lwp
);
2063 /* And we need to be sure that any all-threads-stopping doesn't try
2064 to move threads out of the jump pads, as it could deadlock the
2065 inferior (LWP could be in the jump pad, maybe even holding the
2068 /* Do any necessary step collect actions. */
2069 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2071 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2073 /* See if we just hit a tracepoint and do its main collect
2075 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2077 lwp_suspended_decr (lwp
);
2079 gdb_assert (lwp
->suspended
== 0);
2080 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
2082 if (tpoint_related_event
)
2085 debug_printf ("got a tracepoint event\n");
2092 /* Convenience wrapper. Returns true if LWP is presently collecting a
2096 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2097 struct fast_tpoint_collect_status
*status
)
2099 CORE_ADDR thread_area
;
2100 struct thread_info
*thread
= get_lwp_thread (lwp
);
2102 if (the_low_target
.get_thread_area
== NULL
)
2105 /* Get the thread area address. This is used to recognize which
2106 thread is which when tracing with the in-process agent library.
2107 We don't read anything from the address, and treat it as opaque;
2108 it's the address itself that we assume is unique per-thread. */
2109 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2112 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2115 /* The reason we resume in the caller, is because we want to be able
2116 to pass lwp->status_pending as WSTAT, and we need to clear
2117 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2118 refuses to resume. */
2121 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2123 struct thread_info
*saved_thread
;
2125 saved_thread
= current_thread
;
2126 current_thread
= get_lwp_thread (lwp
);
2129 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2130 && supports_fast_tracepoints ()
2131 && agent_loaded_p ())
2133 struct fast_tpoint_collect_status status
;
2137 debug_printf ("Checking whether LWP %ld needs to move out of the "
2139 lwpid_of (current_thread
));
2141 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
2144 || (WSTOPSIG (*wstat
) != SIGILL
2145 && WSTOPSIG (*wstat
) != SIGFPE
2146 && WSTOPSIG (*wstat
) != SIGSEGV
2147 && WSTOPSIG (*wstat
) != SIGBUS
))
2149 lwp
->collecting_fast_tracepoint
= r
;
2153 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
2155 /* Haven't executed the original instruction yet.
2156 Set breakpoint there, and wait till it's hit,
2157 then single-step until exiting the jump pad. */
2158 lwp
->exit_jump_pad_bkpt
2159 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2163 debug_printf ("Checking whether LWP %ld needs to move out of "
2164 "the jump pad...it does\n",
2165 lwpid_of (current_thread
));
2166 current_thread
= saved_thread
;
2173 /* If we get a synchronous signal while collecting, *and*
2174 while executing the (relocated) original instruction,
2175 reset the PC to point at the tpoint address, before
2176 reporting to GDB. Otherwise, it's an IPA lib bug: just
2177 report the signal to GDB, and pray for the best. */
2179 lwp
->collecting_fast_tracepoint
= 0;
2182 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2183 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2186 struct regcache
*regcache
;
2188 /* The si_addr on a few signals references the address
2189 of the faulting instruction. Adjust that as
2191 if ((WSTOPSIG (*wstat
) == SIGILL
2192 || WSTOPSIG (*wstat
) == SIGFPE
2193 || WSTOPSIG (*wstat
) == SIGBUS
2194 || WSTOPSIG (*wstat
) == SIGSEGV
)
2195 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2196 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2197 /* Final check just to make sure we don't clobber
2198 the siginfo of non-kernel-sent signals. */
2199 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2201 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2202 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2203 (PTRACE_TYPE_ARG3
) 0, &info
);
2206 regcache
= get_thread_regcache (current_thread
, 1);
2207 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2208 lwp
->stop_pc
= status
.tpoint_addr
;
2210 /* Cancel any fast tracepoint lock this thread was
2212 force_unlock_trace_buffer ();
2215 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2218 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2219 "stopping all threads momentarily.\n");
2221 stop_all_lwps (1, lwp
);
2223 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2224 lwp
->exit_jump_pad_bkpt
= NULL
;
2226 unstop_all_lwps (1, lwp
);
2228 gdb_assert (lwp
->suspended
>= 0);
2234 debug_printf ("Checking whether LWP %ld needs to move out of the "
2236 lwpid_of (current_thread
));
2238 current_thread
= saved_thread
;
2242 /* Enqueue one signal in the "signals to report later when out of the
2246 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2248 struct pending_signals
*p_sig
;
2249 struct thread_info
*thread
= get_lwp_thread (lwp
);
2252 debug_printf ("Deferring signal %d for LWP %ld.\n",
2253 WSTOPSIG (*wstat
), lwpid_of (thread
));
2257 struct pending_signals
*sig
;
2259 for (sig
= lwp
->pending_signals_to_report
;
2262 debug_printf (" Already queued %d\n",
2265 debug_printf (" (no more currently queued signals)\n");
2268 /* Don't enqueue non-RT signals if they are already in the deferred
2269 queue. (SIGSTOP being the easiest signal to see ending up here
2271 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2273 struct pending_signals
*sig
;
2275 for (sig
= lwp
->pending_signals_to_report
;
2279 if (sig
->signal
== WSTOPSIG (*wstat
))
2282 debug_printf ("Not requeuing already queued non-RT signal %d"
2291 p_sig
= XCNEW (struct pending_signals
);
2292 p_sig
->prev
= lwp
->pending_signals_to_report
;
2293 p_sig
->signal
= WSTOPSIG (*wstat
);
2295 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2298 lwp
->pending_signals_to_report
= p_sig
;
2301 /* Dequeue one signal from the "signals to report later when out of
2302 the jump pad" list. */
2305 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2307 struct thread_info
*thread
= get_lwp_thread (lwp
);
2309 if (lwp
->pending_signals_to_report
!= NULL
)
2311 struct pending_signals
**p_sig
;
2313 p_sig
= &lwp
->pending_signals_to_report
;
2314 while ((*p_sig
)->prev
!= NULL
)
2315 p_sig
= &(*p_sig
)->prev
;
2317 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2318 if ((*p_sig
)->info
.si_signo
!= 0)
2319 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2325 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2326 WSTOPSIG (*wstat
), lwpid_of (thread
));
2330 struct pending_signals
*sig
;
2332 for (sig
= lwp
->pending_signals_to_report
;
2335 debug_printf (" Still queued %d\n",
2338 debug_printf (" (no more queued signals)\n");
2347 /* Fetch the possibly triggered data watchpoint info and store it in
2350 On some archs, like x86, that use debug registers to set
2351 watchpoints, it's possible that the way to know which watched
2352 address trapped, is to check the register that is used to select
2353 which address to watch. Problem is, between setting the watchpoint
2354 and reading back which data address trapped, the user may change
2355 the set of watchpoints, and, as a consequence, GDB changes the
2356 debug registers in the inferior. To avoid reading back a stale
2357 stopped-data-address when that happens, we cache in LP the fact
2358 that a watchpoint trapped, and the corresponding data address, as
2359 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2360 registers meanwhile, we have the cached data we can rely on. */
2363 check_stopped_by_watchpoint (struct lwp_info
*child
)
2365 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2367 struct thread_info
*saved_thread
;
2369 saved_thread
= current_thread
;
2370 current_thread
= get_lwp_thread (child
);
2372 if (the_low_target
.stopped_by_watchpoint ())
2374 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2376 if (the_low_target
.stopped_data_address
!= NULL
)
2377 child
->stopped_data_address
2378 = the_low_target
.stopped_data_address ();
2380 child
->stopped_data_address
= 0;
2383 current_thread
= saved_thread
;
2386 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2389 /* Return the ptrace options that we want to try to enable. */
2392 linux_low_ptrace_options (int attached
)
2397 options
|= PTRACE_O_EXITKILL
;
2399 if (report_fork_events
)
2400 options
|= PTRACE_O_TRACEFORK
;
2402 if (report_vfork_events
)
2403 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2405 if (report_exec_events
)
2406 options
|= PTRACE_O_TRACEEXEC
;
2408 options
|= PTRACE_O_TRACESYSGOOD
;
2413 /* Do low-level handling of the event, and check if we should go on
2414 and pass it to caller code. Return the affected lwp if we are, or
2417 static struct lwp_info
*
2418 linux_low_filter_event (int lwpid
, int wstat
)
2420 struct lwp_info
*child
;
2421 struct thread_info
*thread
;
2422 int have_stop_pc
= 0;
2424 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2426 /* Check for stop events reported by a process we didn't already
2427 know about - anything not already in our LWP list.
2429 If we're expecting to receive stopped processes after
2430 fork, vfork, and clone events, then we'll just add the
2431 new one to our list and go back to waiting for the event
2432 to be reported - the stopped process might be returned
2433 from waitpid before or after the event is.
2435 But note the case of a non-leader thread exec'ing after the
2436 leader having exited, and gone from our lists (because
2437 check_zombie_leaders deleted it). The non-leader thread
2438 changes its tid to the tgid. */
2440 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2441 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2445 /* A multi-thread exec after we had seen the leader exiting. */
2448 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2449 "after exec.\n", lwpid
);
2452 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2453 child
= add_lwp (child_ptid
);
2455 current_thread
= child
->thread
;
2458 /* If we didn't find a process, one of two things presumably happened:
2459 - A process we started and then detached from has exited. Ignore it.
2460 - A process we are controlling has forked and the new child's stop
2461 was reported to us by the kernel. Save its PID. */
2462 if (child
== NULL
&& WIFSTOPPED (wstat
))
2464 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2467 else if (child
== NULL
)
2470 thread
= get_lwp_thread (child
);
2474 child
->last_status
= wstat
;
2476 /* Check if the thread has exited. */
2477 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2480 debug_printf ("LLFE: %d exited.\n", lwpid
);
2482 if (finish_step_over (child
))
2484 /* Unsuspend all other LWPs, and set them back running again. */
2485 unsuspend_all_lwps (child
);
2488 /* If there is at least one more LWP, then the exit signal was
2489 not the end of the debugged application and should be
2490 ignored, unless GDB wants to hear about thread exits. */
2491 if (report_thread_events
2492 || last_thread_of_process_p (pid_of (thread
)))
2494 /* Since events are serialized to GDB core, and we can't
2495 report this one right now. Leave the status pending for
2496 the next time we're able to report it. */
2497 mark_lwp_dead (child
, wstat
);
2507 gdb_assert (WIFSTOPPED (wstat
));
2509 if (WIFSTOPPED (wstat
))
2511 struct process_info
*proc
;
2513 /* Architecture-specific setup after inferior is running. */
2514 proc
= find_process_pid (pid_of (thread
));
2515 if (proc
->tdesc
== NULL
)
2519 /* This needs to happen after we have attached to the
2520 inferior and it is stopped for the first time, but
2521 before we access any inferior registers. */
2522 linux_arch_setup_thread (thread
);
2526 /* The process is started, but GDBserver will do
2527 architecture-specific setup after the program stops at
2528 the first instruction. */
2529 child
->status_pending_p
= 1;
2530 child
->status_pending
= wstat
;
2536 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2538 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2539 int options
= linux_low_ptrace_options (proc
->attached
);
2541 linux_enable_event_reporting (lwpid
, options
);
2542 child
->must_set_ptrace_flags
= 0;
2545 /* Always update syscall_state, even if it will be filtered later. */
2546 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2548 child
->syscall_state
2549 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2550 ? TARGET_WAITKIND_SYSCALL_RETURN
2551 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2555 /* Almost all other ptrace-stops are known to be outside of system
2556 calls, with further exceptions in handle_extended_wait. */
2557 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2560 /* Be careful to not overwrite stop_pc until save_stop_reason is
2562 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2563 && linux_is_extended_waitstatus (wstat
))
2565 child
->stop_pc
= get_pc (child
);
2566 if (handle_extended_wait (&child
, wstat
))
2568 /* The event has been handled, so just return without
2574 if (linux_wstatus_maybe_breakpoint (wstat
))
2576 if (save_stop_reason (child
))
2581 child
->stop_pc
= get_pc (child
);
2583 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2584 && child
->stop_expected
)
2587 debug_printf ("Expected stop.\n");
2588 child
->stop_expected
= 0;
2590 if (thread
->last_resume_kind
== resume_stop
)
2592 /* We want to report the stop to the core. Treat the
2593 SIGSTOP as a normal event. */
2595 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2596 target_pid_to_str (ptid_of (thread
)));
2598 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2600 /* Stopping threads. We don't want this SIGSTOP to end up
2603 debug_printf ("LLW: SIGSTOP caught for %s "
2604 "while stopping threads.\n",
2605 target_pid_to_str (ptid_of (thread
)));
2610 /* This is a delayed SIGSTOP. Filter out the event. */
2612 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2613 child
->stepping
? "step" : "continue",
2614 target_pid_to_str (ptid_of (thread
)));
2616 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2621 child
->status_pending_p
= 1;
2622 child
->status_pending
= wstat
;
2626 /* Return true if THREAD is doing hardware single step. */
2629 maybe_hw_step (struct thread_info
*thread
)
2631 if (can_hardware_single_step ())
2635 struct process_info
*proc
= get_thread_process (thread
);
2637 /* GDBserver must insert reinsert breakpoint for software
2639 gdb_assert (has_reinsert_breakpoints (proc
));
2644 /* Resume LWPs that are currently stopped without any pending status
2645 to report, but are resumed from the core's perspective. */
2648 resume_stopped_resumed_lwps (struct inferior_list_entry
*entry
)
2650 struct thread_info
*thread
= (struct thread_info
*) entry
;
2651 struct lwp_info
*lp
= get_thread_lwp (thread
);
2655 && !lp
->status_pending_p
2656 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2658 int step
= thread
->last_resume_kind
== resume_step
;
2661 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2662 target_pid_to_str (ptid_of (thread
)),
2663 paddress (lp
->stop_pc
),
2666 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2670 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2671 match FILTER_PTID (leaving others pending). The PTIDs can be:
2672 minus_one_ptid, to specify any child; a pid PTID, specifying all
2673 lwps of a thread group; or a PTID representing a single lwp. Store
2674 the stop status through the status pointer WSTAT. OPTIONS is
2675 passed to the waitpid call. Return 0 if no event was found and
2676 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2677 was found. Return the PID of the stopped child otherwise. */
2680 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2681 int *wstatp
, int options
)
2683 struct thread_info
*event_thread
;
2684 struct lwp_info
*event_child
, *requested_child
;
2685 sigset_t block_mask
, prev_mask
;
2688 /* N.B. event_thread points to the thread_info struct that contains
2689 event_child. Keep them in sync. */
2690 event_thread
= NULL
;
2692 requested_child
= NULL
;
2694 /* Check for a lwp with a pending status. */
2696 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2698 event_thread
= (struct thread_info
*)
2699 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2700 if (event_thread
!= NULL
)
2701 event_child
= get_thread_lwp (event_thread
);
2702 if (debug_threads
&& event_thread
)
2703 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2705 else if (!ptid_equal (filter_ptid
, null_ptid
))
2707 requested_child
= find_lwp_pid (filter_ptid
);
2709 if (stopping_threads
== NOT_STOPPING_THREADS
2710 && requested_child
->status_pending_p
2711 && requested_child
->collecting_fast_tracepoint
)
2713 enqueue_one_deferred_signal (requested_child
,
2714 &requested_child
->status_pending
);
2715 requested_child
->status_pending_p
= 0;
2716 requested_child
->status_pending
= 0;
2717 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2720 if (requested_child
->suspended
2721 && requested_child
->status_pending_p
)
2723 internal_error (__FILE__
, __LINE__
,
2724 "requesting an event out of a"
2725 " suspended child?");
2728 if (requested_child
->status_pending_p
)
2730 event_child
= requested_child
;
2731 event_thread
= get_lwp_thread (event_child
);
2735 if (event_child
!= NULL
)
2738 debug_printf ("Got an event from pending child %ld (%04x)\n",
2739 lwpid_of (event_thread
), event_child
->status_pending
);
2740 *wstatp
= event_child
->status_pending
;
2741 event_child
->status_pending_p
= 0;
2742 event_child
->status_pending
= 0;
2743 current_thread
= event_thread
;
2744 return lwpid_of (event_thread
);
2747 /* But if we don't find a pending event, we'll have to wait.
2749 We only enter this loop if no process has a pending wait status.
2750 Thus any action taken in response to a wait status inside this
2751 loop is responding as soon as we detect the status, not after any
2754 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2755 all signals while here. */
2756 sigfillset (&block_mask
);
2757 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2759 /* Always pull all events out of the kernel. We'll randomly select
2760 an event LWP out of all that have events, to prevent
2762 while (event_child
== NULL
)
2766 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2769 - If the thread group leader exits while other threads in the
2770 thread group still exist, waitpid(TGID, ...) hangs. That
2771 waitpid won't return an exit status until the other threads
2772 in the group are reaped.
2774 - When a non-leader thread execs, that thread just vanishes
2775 without reporting an exit (so we'd hang if we waited for it
2776 explicitly in that case). The exec event is reported to
2779 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2782 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2783 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2789 debug_printf ("LLW: waitpid %ld received %s\n",
2790 (long) ret
, status_to_str (*wstatp
));
2793 /* Filter all events. IOW, leave all events pending. We'll
2794 randomly select an event LWP out of all that have events
2796 linux_low_filter_event (ret
, *wstatp
);
2797 /* Retry until nothing comes out of waitpid. A single
2798 SIGCHLD can indicate more than one child stopped. */
2802 /* Now that we've pulled all events out of the kernel, resume
2803 LWPs that don't have an interesting event to report. */
2804 if (stopping_threads
== NOT_STOPPING_THREADS
)
2805 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2807 /* ... and find an LWP with a status to report to the core, if
2809 event_thread
= (struct thread_info
*)
2810 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2811 if (event_thread
!= NULL
)
2813 event_child
= get_thread_lwp (event_thread
);
2814 *wstatp
= event_child
->status_pending
;
2815 event_child
->status_pending_p
= 0;
2816 event_child
->status_pending
= 0;
2820 /* Check for zombie thread group leaders. Those can't be reaped
2821 until all other threads in the thread group are. */
2822 check_zombie_leaders ();
2824 /* If there are no resumed children left in the set of LWPs we
2825 want to wait for, bail. We can't just block in
2826 waitpid/sigsuspend, because lwps might have been left stopped
2827 in trace-stop state, and we'd be stuck forever waiting for
2828 their status to change (which would only happen if we resumed
2829 them). Even if WNOHANG is set, this return code is preferred
2830 over 0 (below), as it is more detailed. */
2831 if ((find_inferior (&all_threads
,
2832 not_stopped_callback
,
2833 &wait_ptid
) == NULL
))
2836 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2837 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2841 /* No interesting event to report to the caller. */
2842 if ((options
& WNOHANG
))
2845 debug_printf ("WNOHANG set, no event found\n");
2847 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2851 /* Block until we get an event reported with SIGCHLD. */
2853 debug_printf ("sigsuspend'ing\n");
2855 sigsuspend (&prev_mask
);
2856 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2860 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2862 current_thread
= event_thread
;
2864 return lwpid_of (event_thread
);
2867 /* Wait for an event from child(ren) PTID. PTIDs can be:
2868 minus_one_ptid, to specify any child; a pid PTID, specifying all
2869 lwps of a thread group; or a PTID representing a single lwp. Store
2870 the stop status through the status pointer WSTAT. OPTIONS is
2871 passed to the waitpid call. Return 0 if no event was found and
2872 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2873 was found. Return the PID of the stopped child otherwise. */
2876 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2878 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2881 /* Count the LWP's that have had events. */
2884 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2886 struct thread_info
*thread
= (struct thread_info
*) entry
;
2887 struct lwp_info
*lp
= get_thread_lwp (thread
);
2888 int *count
= (int *) data
;
2890 gdb_assert (count
!= NULL
);
2892 /* Count only resumed LWPs that have an event pending. */
2893 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2894 && lp
->status_pending_p
)
2900 /* Select the LWP (if any) that is currently being single-stepped. */
2903 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2905 struct thread_info
*thread
= (struct thread_info
*) entry
;
2906 struct lwp_info
*lp
= get_thread_lwp (thread
);
2908 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2909 && thread
->last_resume_kind
== resume_step
2910 && lp
->status_pending_p
)
2916 /* Select the Nth LWP that has had an event. */
2919 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2921 struct thread_info
*thread
= (struct thread_info
*) entry
;
2922 struct lwp_info
*lp
= get_thread_lwp (thread
);
2923 int *selector
= (int *) data
;
2925 gdb_assert (selector
!= NULL
);
2927 /* Select only resumed LWPs that have an event pending. */
2928 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2929 && lp
->status_pending_p
)
2930 if ((*selector
)-- == 0)
2936 /* Select one LWP out of those that have events pending. */
2939 select_event_lwp (struct lwp_info
**orig_lp
)
2942 int random_selector
;
2943 struct thread_info
*event_thread
= NULL
;
2945 /* In all-stop, give preference to the LWP that is being
2946 single-stepped. There will be at most one, and it's the LWP that
2947 the core is most interested in. If we didn't do this, then we'd
2948 have to handle pending step SIGTRAPs somehow in case the core
2949 later continues the previously-stepped thread, otherwise we'd
2950 report the pending SIGTRAP, and the core, not having stepped the
2951 thread, wouldn't understand what the trap was for, and therefore
2952 would report it to the user as a random signal. */
2956 = (struct thread_info
*) find_inferior (&all_threads
,
2957 select_singlestep_lwp_callback
,
2959 if (event_thread
!= NULL
)
2962 debug_printf ("SEL: Select single-step %s\n",
2963 target_pid_to_str (ptid_of (event_thread
)));
2966 if (event_thread
== NULL
)
2968 /* No single-stepping LWP. Select one at random, out of those
2969 which have had events. */
2971 /* First see how many events we have. */
2972 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2973 gdb_assert (num_events
> 0);
2975 /* Now randomly pick a LWP out of those that have had
2977 random_selector
= (int)
2978 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2980 if (debug_threads
&& num_events
> 1)
2981 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2982 num_events
, random_selector
);
2985 = (struct thread_info
*) find_inferior (&all_threads
,
2986 select_event_lwp_callback
,
2990 if (event_thread
!= NULL
)
2992 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2994 /* Switch the event LWP. */
2995 *orig_lp
= event_lp
;
2999 /* Decrement the suspend count of an LWP. */
3002 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
3004 struct thread_info
*thread
= (struct thread_info
*) entry
;
3005 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3007 /* Ignore EXCEPT. */
3011 lwp_suspended_decr (lwp
);
3015 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
3019 unsuspend_all_lwps (struct lwp_info
*except
)
3021 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
3024 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
3025 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
3027 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
3028 static ptid_t
linux_wait_1 (ptid_t ptid
,
3029 struct target_waitstatus
*ourstatus
,
3030 int target_options
);
3032 /* Stabilize threads (move out of jump pads).
3034 If a thread is midway collecting a fast tracepoint, we need to
3035 finish the collection and move it out of the jump pad before
3036 reporting the signal.
3038 This avoids recursion while collecting (when a signal arrives
3039 midway, and the signal handler itself collects), which would trash
3040 the trace buffer. In case the user set a breakpoint in a signal
3041 handler, this avoids the backtrace showing the jump pad, etc..
3042 Most importantly, there are certain things we can't do safely if
3043 threads are stopped in a jump pad (or in its callee's). For
3046 - starting a new trace run. A thread still collecting the
3047 previous run, could trash the trace buffer when resumed. The trace
3048 buffer control structures would have been reset but the thread had
3049 no way to tell. The thread could even midway memcpy'ing to the
3050 buffer, which would mean that when resumed, it would clobber the
3051 trace buffer that had been set for a new run.
3053 - we can't rewrite/reuse the jump pads for new tracepoints
3054 safely. Say you do tstart while a thread is stopped midway while
3055 collecting. When the thread is later resumed, it finishes the
3056 collection, and returns to the jump pad, to execute the original
3057 instruction that was under the tracepoint jump at the time the
3058 older run had been started. If the jump pad had been rewritten
3059 since for something else in the new run, the thread would now
3060 execute the wrong / random instructions. */
3063 linux_stabilize_threads (void)
3065 struct thread_info
*saved_thread
;
3066 struct thread_info
*thread_stuck
;
3069 = (struct thread_info
*) find_inferior (&all_threads
,
3070 stuck_in_jump_pad_callback
,
3072 if (thread_stuck
!= NULL
)
3075 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
3076 lwpid_of (thread_stuck
));
3080 saved_thread
= current_thread
;
3082 stabilizing_threads
= 1;
3085 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
3087 /* Loop until all are stopped out of the jump pads. */
3088 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
3090 struct target_waitstatus ourstatus
;
3091 struct lwp_info
*lwp
;
3094 /* Note that we go through the full wait even loop. While
3095 moving threads out of jump pad, we need to be able to step
3096 over internal breakpoints and such. */
3097 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
3099 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
3101 lwp
= get_thread_lwp (current_thread
);
3104 lwp_suspended_inc (lwp
);
3106 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3107 || current_thread
->last_resume_kind
== resume_stop
)
3109 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3110 enqueue_one_deferred_signal (lwp
, &wstat
);
3115 unsuspend_all_lwps (NULL
);
3117 stabilizing_threads
= 0;
3119 current_thread
= saved_thread
;
3124 = (struct thread_info
*) find_inferior (&all_threads
,
3125 stuck_in_jump_pad_callback
,
3127 if (thread_stuck
!= NULL
)
3128 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3129 lwpid_of (thread_stuck
));
3133 /* Convenience function that is called when the kernel reports an
3134 event that is not passed out to GDB. */
3137 ignore_event (struct target_waitstatus
*ourstatus
)
3139 /* If we got an event, there may still be others, as a single
3140 SIGCHLD can indicate more than one child stopped. This forces
3141 another target_wait call. */
3144 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3148 /* Convenience function that is called when the kernel reports an exit
3149 event. This decides whether to report the event to GDB as a
3150 process exit event, a thread exit event, or to suppress the
3154 filter_exit_event (struct lwp_info
*event_child
,
3155 struct target_waitstatus
*ourstatus
)
3157 struct thread_info
*thread
= get_lwp_thread (event_child
);
3158 ptid_t ptid
= ptid_of (thread
);
3160 if (!last_thread_of_process_p (pid_of (thread
)))
3162 if (report_thread_events
)
3163 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3165 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3167 delete_lwp (event_child
);
3172 /* Returns 1 if GDB is interested in any event_child syscalls. */
3175 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3177 struct thread_info
*thread
= get_lwp_thread (event_child
);
3178 struct process_info
*proc
= get_thread_process (thread
);
3180 return !VEC_empty (int, proc
->syscalls_to_catch
);
3183 /* Returns 1 if GDB is interested in the event_child syscall.
3184 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3187 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3191 struct thread_info
*thread
= get_lwp_thread (event_child
);
3192 struct process_info
*proc
= get_thread_process (thread
);
3194 if (VEC_empty (int, proc
->syscalls_to_catch
))
3197 if (VEC_index (int, proc
->syscalls_to_catch
, 0) == ANY_SYSCALL
)
3200 get_syscall_trapinfo (event_child
, &sysno
);
3202 VEC_iterate (int, proc
->syscalls_to_catch
, i
, iter
);
3210 /* Wait for process, returns status. */
3213 linux_wait_1 (ptid_t ptid
,
3214 struct target_waitstatus
*ourstatus
, int target_options
)
3217 struct lwp_info
*event_child
;
3220 int step_over_finished
;
3221 int bp_explains_trap
;
3222 int maybe_internal_trap
;
3231 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3234 /* Translate generic target options into linux options. */
3236 if (target_options
& TARGET_WNOHANG
)
3239 bp_explains_trap
= 0;
3242 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3244 /* Find a resumed LWP, if any. */
3245 if (find_inferior (&all_threads
,
3246 status_pending_p_callback
,
3247 &minus_one_ptid
) != NULL
)
3249 else if ((find_inferior (&all_threads
,
3250 not_stopped_callback
,
3251 &minus_one_ptid
) != NULL
))
3256 if (ptid_equal (step_over_bkpt
, null_ptid
))
3257 pid
= linux_wait_for_event (ptid
, &w
, options
);
3261 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3262 target_pid_to_str (step_over_bkpt
));
3263 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3266 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3268 gdb_assert (target_options
& TARGET_WNOHANG
);
3272 debug_printf ("linux_wait_1 ret = null_ptid, "
3273 "TARGET_WAITKIND_IGNORE\n");
3277 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3284 debug_printf ("linux_wait_1 ret = null_ptid, "
3285 "TARGET_WAITKIND_NO_RESUMED\n");
3289 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3293 event_child
= get_thread_lwp (current_thread
);
3295 /* linux_wait_for_event only returns an exit status for the last
3296 child of a process. Report it. */
3297 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3301 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3302 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3306 debug_printf ("linux_wait_1 ret = %s, exited with "
3308 target_pid_to_str (ptid_of (current_thread
)),
3315 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3316 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3320 debug_printf ("linux_wait_1 ret = %s, terminated with "
3322 target_pid_to_str (ptid_of (current_thread
)),
3328 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3329 return filter_exit_event (event_child
, ourstatus
);
3331 return ptid_of (current_thread
);
3334 /* If step-over executes a breakpoint instruction, in the case of a
3335 hardware single step it means a gdb/gdbserver breakpoint had been
3336 planted on top of a permanent breakpoint, in the case of a software
3337 single step it may just mean that gdbserver hit the reinsert breakpoint.
3338 The PC has been adjusted by save_stop_reason to point at
3339 the breakpoint address.
3340 So in the case of the hardware single step advance the PC manually
3341 past the breakpoint and in the case of software single step advance only
3342 if it's not the reinsert_breakpoint we are hitting.
3343 This avoids that a program would keep trapping a permanent breakpoint
3345 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3346 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3347 && (event_child
->stepping
3348 || !reinsert_breakpoint_inserted_here (event_child
->stop_pc
)))
3350 int increment_pc
= 0;
3351 int breakpoint_kind
= 0;
3352 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3355 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3356 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3360 debug_printf ("step-over for %s executed software breakpoint\n",
3361 target_pid_to_str (ptid_of (current_thread
)));
3364 if (increment_pc
!= 0)
3366 struct regcache
*regcache
3367 = get_thread_regcache (current_thread
, 1);
3369 event_child
->stop_pc
+= increment_pc
;
3370 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3372 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3373 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3377 /* If this event was not handled before, and is not a SIGTRAP, we
3378 report it. SIGILL and SIGSEGV are also treated as traps in case
3379 a breakpoint is inserted at the current PC. If this target does
3380 not support internal breakpoints at all, we also report the
3381 SIGTRAP without further processing; it's of no concern to us. */
3383 = (supports_breakpoints ()
3384 && (WSTOPSIG (w
) == SIGTRAP
3385 || ((WSTOPSIG (w
) == SIGILL
3386 || WSTOPSIG (w
) == SIGSEGV
)
3387 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3389 if (maybe_internal_trap
)
3391 /* Handle anything that requires bookkeeping before deciding to
3392 report the event or continue waiting. */
3394 /* First check if we can explain the SIGTRAP with an internal
3395 breakpoint, or if we should possibly report the event to GDB.
3396 Do this before anything that may remove or insert a
3398 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3400 /* We have a SIGTRAP, possibly a step-over dance has just
3401 finished. If so, tweak the state machine accordingly,
3402 reinsert breakpoints and delete any reinsert (software
3403 single-step) breakpoints. */
3404 step_over_finished
= finish_step_over (event_child
);
3406 /* Now invoke the callbacks of any internal breakpoints there. */
3407 check_breakpoints (event_child
->stop_pc
);
3409 /* Handle tracepoint data collecting. This may overflow the
3410 trace buffer, and cause a tracing stop, removing
3412 trace_event
= handle_tracepoints (event_child
);
3414 if (bp_explains_trap
)
3417 debug_printf ("Hit a gdbserver breakpoint.\n");
3422 /* We have some other signal, possibly a step-over dance was in
3423 progress, and it should be cancelled too. */
3424 step_over_finished
= finish_step_over (event_child
);
3427 /* We have all the data we need. Either report the event to GDB, or
3428 resume threads and keep waiting for more. */
3430 /* If we're collecting a fast tracepoint, finish the collection and
3431 move out of the jump pad before delivering a signal. See
3432 linux_stabilize_threads. */
3435 && WSTOPSIG (w
) != SIGTRAP
3436 && supports_fast_tracepoints ()
3437 && agent_loaded_p ())
3440 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3441 "to defer or adjust it.\n",
3442 WSTOPSIG (w
), lwpid_of (current_thread
));
3444 /* Allow debugging the jump pad itself. */
3445 if (current_thread
->last_resume_kind
!= resume_step
3446 && maybe_move_out_of_jump_pad (event_child
, &w
))
3448 enqueue_one_deferred_signal (event_child
, &w
);
3451 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3452 WSTOPSIG (w
), lwpid_of (current_thread
));
3454 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3456 return ignore_event (ourstatus
);
3460 if (event_child
->collecting_fast_tracepoint
)
3463 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3464 "Check if we're already there.\n",
3465 lwpid_of (current_thread
),
3466 event_child
->collecting_fast_tracepoint
);
3470 event_child
->collecting_fast_tracepoint
3471 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3473 if (event_child
->collecting_fast_tracepoint
!= 1)
3475 /* No longer need this breakpoint. */
3476 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3479 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3480 "stopping all threads momentarily.\n");
3482 /* Other running threads could hit this breakpoint.
3483 We don't handle moribund locations like GDB does,
3484 instead we always pause all threads when removing
3485 breakpoints, so that any step-over or
3486 decr_pc_after_break adjustment is always taken
3487 care of while the breakpoint is still
3489 stop_all_lwps (1, event_child
);
3491 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3492 event_child
->exit_jump_pad_bkpt
= NULL
;
3494 unstop_all_lwps (1, event_child
);
3496 gdb_assert (event_child
->suspended
>= 0);
3500 if (event_child
->collecting_fast_tracepoint
== 0)
3503 debug_printf ("fast tracepoint finished "
3504 "collecting successfully.\n");
3506 /* We may have a deferred signal to report. */
3507 if (dequeue_one_deferred_signal (event_child
, &w
))
3510 debug_printf ("dequeued one signal.\n");
3515 debug_printf ("no deferred signals.\n");
3517 if (stabilizing_threads
)
3519 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3520 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3524 debug_printf ("linux_wait_1 ret = %s, stopped "
3525 "while stabilizing threads\n",
3526 target_pid_to_str (ptid_of (current_thread
)));
3530 return ptid_of (current_thread
);
3536 /* Check whether GDB would be interested in this event. */
3538 /* Check if GDB is interested in this syscall. */
3540 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3541 && !gdb_catch_this_syscall_p (event_child
))
3545 debug_printf ("Ignored syscall for LWP %ld.\n",
3546 lwpid_of (current_thread
));
3549 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3551 return ignore_event (ourstatus
);
3554 /* If GDB is not interested in this signal, don't stop other
3555 threads, and don't report it to GDB. Just resume the inferior
3556 right away. We do this for threading-related signals as well as
3557 any that GDB specifically requested we ignore. But never ignore
3558 SIGSTOP if we sent it ourselves, and do not ignore signals when
3559 stepping - they may require special handling to skip the signal
3560 handler. Also never ignore signals that could be caused by a
3563 && current_thread
->last_resume_kind
!= resume_step
3565 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3566 (current_process ()->priv
->thread_db
!= NULL
3567 && (WSTOPSIG (w
) == __SIGRTMIN
3568 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3571 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3572 && !(WSTOPSIG (w
) == SIGSTOP
3573 && current_thread
->last_resume_kind
== resume_stop
)
3574 && !linux_wstatus_maybe_breakpoint (w
))))
3576 siginfo_t info
, *info_p
;
3579 debug_printf ("Ignored signal %d for LWP %ld.\n",
3580 WSTOPSIG (w
), lwpid_of (current_thread
));
3582 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3583 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3588 if (step_over_finished
)
3590 /* We cancelled this thread's step-over above. We still
3591 need to unsuspend all other LWPs, and set them back
3592 running again while the signal handler runs. */
3593 unsuspend_all_lwps (event_child
);
3595 /* Enqueue the pending signal info so that proceed_all_lwps
3597 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3599 proceed_all_lwps ();
3603 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3604 WSTOPSIG (w
), info_p
);
3606 return ignore_event (ourstatus
);
3609 /* Note that all addresses are always "out of the step range" when
3610 there's no range to begin with. */
3611 in_step_range
= lwp_in_step_range (event_child
);
3613 /* If GDB wanted this thread to single step, and the thread is out
3614 of the step range, we always want to report the SIGTRAP, and let
3615 GDB handle it. Watchpoints should always be reported. So should
3616 signals we can't explain. A SIGTRAP we can't explain could be a
3617 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3618 do, we're be able to handle GDB breakpoints on top of internal
3619 breakpoints, by handling the internal breakpoint and still
3620 reporting the event to GDB. If we don't, we're out of luck, GDB
3621 won't see the breakpoint hit. If we see a single-step event but
3622 the thread should be continuing, don't pass the trap to gdb.
3623 That indicates that we had previously finished a single-step but
3624 left the single-step pending -- see
3625 complete_ongoing_step_over. */
3626 report_to_gdb
= (!maybe_internal_trap
3627 || (current_thread
->last_resume_kind
== resume_step
3629 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3631 && !bp_explains_trap
3633 && !step_over_finished
3634 && !(current_thread
->last_resume_kind
== resume_continue
3635 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3636 || (gdb_breakpoint_here (event_child
->stop_pc
)
3637 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3638 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3639 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3641 run_breakpoint_commands (event_child
->stop_pc
);
3643 /* We found no reason GDB would want us to stop. We either hit one
3644 of our own breakpoints, or finished an internal step GDB
3645 shouldn't know about. */
3650 if (bp_explains_trap
)
3651 debug_printf ("Hit a gdbserver breakpoint.\n");
3652 if (step_over_finished
)
3653 debug_printf ("Step-over finished.\n");
3655 debug_printf ("Tracepoint event.\n");
3656 if (lwp_in_step_range (event_child
))
3657 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3658 paddress (event_child
->stop_pc
),
3659 paddress (event_child
->step_range_start
),
3660 paddress (event_child
->step_range_end
));
3663 /* We're not reporting this breakpoint to GDB, so apply the
3664 decr_pc_after_break adjustment to the inferior's regcache
3667 if (the_low_target
.set_pc
!= NULL
)
3669 struct regcache
*regcache
3670 = get_thread_regcache (current_thread
, 1);
3671 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3674 /* We may have finished stepping over a breakpoint. If so,
3675 we've stopped and suspended all LWPs momentarily except the
3676 stepping one. This is where we resume them all again. We're
3677 going to keep waiting, so use proceed, which handles stepping
3678 over the next breakpoint. */
3680 debug_printf ("proceeding all threads.\n");
3682 if (step_over_finished
)
3683 unsuspend_all_lwps (event_child
);
3685 proceed_all_lwps ();
3686 return ignore_event (ourstatus
);
3691 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3695 str
= target_waitstatus_to_string (&event_child
->waitstatus
);
3696 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3697 lwpid_of (get_lwp_thread (event_child
)), str
);
3700 if (current_thread
->last_resume_kind
== resume_step
)
3702 if (event_child
->step_range_start
== event_child
->step_range_end
)
3703 debug_printf ("GDB wanted to single-step, reporting event.\n");
3704 else if (!lwp_in_step_range (event_child
))
3705 debug_printf ("Out of step range, reporting event.\n");
3707 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3708 debug_printf ("Stopped by watchpoint.\n");
3709 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3710 debug_printf ("Stopped by GDB breakpoint.\n");
3712 debug_printf ("Hit a non-gdbserver trap event.\n");
3715 /* Alright, we're going to report a stop. */
3717 if (!stabilizing_threads
)
3719 /* In all-stop, stop all threads. */
3721 stop_all_lwps (0, NULL
);
3723 /* If we're not waiting for a specific LWP, choose an event LWP
3724 from among those that have had events. Giving equal priority
3725 to all LWPs that have had events helps prevent
3727 if (ptid_equal (ptid
, minus_one_ptid
))
3729 event_child
->status_pending_p
= 1;
3730 event_child
->status_pending
= w
;
3732 select_event_lwp (&event_child
);
3734 /* current_thread and event_child must stay in sync. */
3735 current_thread
= get_lwp_thread (event_child
);
3737 event_child
->status_pending_p
= 0;
3738 w
= event_child
->status_pending
;
3741 if (step_over_finished
)
3745 /* If we were doing a step-over, all other threads but
3746 the stepping one had been paused in start_step_over,
3747 with their suspend counts incremented. We don't want
3748 to do a full unstop/unpause, because we're in
3749 all-stop mode (so we want threads stopped), but we
3750 still need to unsuspend the other threads, to
3751 decrement their `suspended' count back. */
3752 unsuspend_all_lwps (event_child
);
3756 /* If we just finished a step-over, then all threads had
3757 been momentarily paused. In all-stop, that's fine,
3758 we want threads stopped by now anyway. In non-stop,
3759 we need to re-resume threads that GDB wanted to be
3761 unstop_all_lwps (1, event_child
);
3765 /* Stabilize threads (move out of jump pads). */
3767 stabilize_threads ();
3771 /* If we just finished a step-over, then all threads had been
3772 momentarily paused. In all-stop, that's fine, we want
3773 threads stopped by now anyway. In non-stop, we need to
3774 re-resume threads that GDB wanted to be running. */
3775 if (step_over_finished
)
3776 unstop_all_lwps (1, event_child
);
3779 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3781 /* If the reported event is an exit, fork, vfork or exec, let
3783 *ourstatus
= event_child
->waitstatus
;
3784 /* Clear the event lwp's waitstatus since we handled it already. */
3785 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3788 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3790 /* Now that we've selected our final event LWP, un-adjust its PC if
3791 it was a software breakpoint, and the client doesn't know we can
3792 adjust the breakpoint ourselves. */
3793 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3794 && !swbreak_feature
)
3796 int decr_pc
= the_low_target
.decr_pc_after_break
;
3800 struct regcache
*regcache
3801 = get_thread_regcache (current_thread
, 1);
3802 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3806 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3808 get_syscall_trapinfo (event_child
,
3809 &ourstatus
->value
.syscall_number
);
3810 ourstatus
->kind
= event_child
->syscall_state
;
3812 else if (current_thread
->last_resume_kind
== resume_stop
3813 && WSTOPSIG (w
) == SIGSTOP
)
3815 /* A thread that has been requested to stop by GDB with vCont;t,
3816 and it stopped cleanly, so report as SIG0. The use of
3817 SIGSTOP is an implementation detail. */
3818 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3820 else if (current_thread
->last_resume_kind
== resume_stop
3821 && WSTOPSIG (w
) != SIGSTOP
)
3823 /* A thread that has been requested to stop by GDB with vCont;t,
3824 but, it stopped for other reasons. */
3825 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3827 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3829 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3832 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3836 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3837 target_pid_to_str (ptid_of (current_thread
)),
3838 ourstatus
->kind
, ourstatus
->value
.sig
);
3842 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3843 return filter_exit_event (event_child
, ourstatus
);
3845 return ptid_of (current_thread
);
3848 /* Get rid of any pending event in the pipe. */
3850 async_file_flush (void)
3856 ret
= read (linux_event_pipe
[0], &buf
, 1);
3857 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3860 /* Put something in the pipe, so the event loop wakes up. */
3862 async_file_mark (void)
3866 async_file_flush ();
3869 ret
= write (linux_event_pipe
[1], "+", 1);
3870 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3872 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3873 be awakened anyway. */
3877 linux_wait (ptid_t ptid
,
3878 struct target_waitstatus
*ourstatus
, int target_options
)
3882 /* Flush the async file first. */
3883 if (target_is_async_p ())
3884 async_file_flush ();
3888 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3890 while ((target_options
& TARGET_WNOHANG
) == 0
3891 && ptid_equal (event_ptid
, null_ptid
)
3892 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3894 /* If at least one stop was reported, there may be more. A single
3895 SIGCHLD can signal more than one child stop. */
3896 if (target_is_async_p ()
3897 && (target_options
& TARGET_WNOHANG
) != 0
3898 && !ptid_equal (event_ptid
, null_ptid
))
3904 /* Send a signal to an LWP. */
3907 kill_lwp (unsigned long lwpid
, int signo
)
3912 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3913 if (errno
== ENOSYS
)
3915 /* If tkill fails, then we are not using nptl threads, a
3916 configuration we no longer support. */
3917 perror_with_name (("tkill"));
3923 linux_stop_lwp (struct lwp_info
*lwp
)
3929 send_sigstop (struct lwp_info
*lwp
)
3933 pid
= lwpid_of (get_lwp_thread (lwp
));
3935 /* If we already have a pending stop signal for this process, don't
3937 if (lwp
->stop_expected
)
3940 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3946 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3948 lwp
->stop_expected
= 1;
3949 kill_lwp (pid
, SIGSTOP
);
3953 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
3955 struct thread_info
*thread
= (struct thread_info
*) entry
;
3956 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3958 /* Ignore EXCEPT. */
3969 /* Increment the suspend count of an LWP, and stop it, if not stopped
3972 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
3975 struct thread_info
*thread
= (struct thread_info
*) entry
;
3976 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3978 /* Ignore EXCEPT. */
3982 lwp_suspended_inc (lwp
);
3984 return send_sigstop_callback (entry
, except
);
3988 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3990 /* Store the exit status for later. */
3991 lwp
->status_pending_p
= 1;
3992 lwp
->status_pending
= wstat
;
3994 /* Store in waitstatus as well, as there's nothing else to process
3996 if (WIFEXITED (wstat
))
3998 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
3999 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
4001 else if (WIFSIGNALED (wstat
))
4003 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
4004 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
4007 /* Prevent trying to stop it. */
4010 /* No further stops are expected from a dead lwp. */
4011 lwp
->stop_expected
= 0;
4014 /* Return true if LWP has exited already, and has a pending exit event
4015 to report to GDB. */
4018 lwp_is_marked_dead (struct lwp_info
*lwp
)
4020 return (lwp
->status_pending_p
4021 && (WIFEXITED (lwp
->status_pending
)
4022 || WIFSIGNALED (lwp
->status_pending
)));
4025 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4028 wait_for_sigstop (void)
4030 struct thread_info
*saved_thread
;
4035 saved_thread
= current_thread
;
4036 if (saved_thread
!= NULL
)
4037 saved_tid
= saved_thread
->entry
.id
;
4039 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4042 debug_printf ("wait_for_sigstop: pulling events\n");
4044 /* Passing NULL_PTID as filter indicates we want all events to be
4045 left pending. Eventually this returns when there are no
4046 unwaited-for children left. */
4047 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4049 gdb_assert (ret
== -1);
4051 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4052 current_thread
= saved_thread
;
4056 debug_printf ("Previously current thread died.\n");
4058 /* We can't change the current inferior behind GDB's back,
4059 otherwise, a subsequent command may apply to the wrong
4061 current_thread
= NULL
;
4065 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
4066 move it out, because we need to report the stop event to GDB. For
4067 example, if the user puts a breakpoint in the jump pad, it's
4068 because she wants to debug it. */
4071 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
4073 struct thread_info
*thread
= (struct thread_info
*) entry
;
4074 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4076 if (lwp
->suspended
!= 0)
4078 internal_error (__FILE__
, __LINE__
,
4079 "LWP %ld is suspended, suspended=%d\n",
4080 lwpid_of (thread
), lwp
->suspended
);
4082 gdb_assert (lwp
->stopped
);
4084 /* Allow debugging the jump pad, gdb_collect, etc.. */
4085 return (supports_fast_tracepoints ()
4086 && agent_loaded_p ()
4087 && (gdb_breakpoint_here (lwp
->stop_pc
)
4088 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4089 || thread
->last_resume_kind
== resume_step
)
4090 && linux_fast_tracepoint_collecting (lwp
, NULL
));
4094 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
4096 struct thread_info
*thread
= (struct thread_info
*) entry
;
4097 struct thread_info
*saved_thread
;
4098 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4101 if (lwp
->suspended
!= 0)
4103 internal_error (__FILE__
, __LINE__
,
4104 "LWP %ld is suspended, suspended=%d\n",
4105 lwpid_of (thread
), lwp
->suspended
);
4107 gdb_assert (lwp
->stopped
);
4109 /* For gdb_breakpoint_here. */
4110 saved_thread
= current_thread
;
4111 current_thread
= thread
;
4113 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4115 /* Allow debugging the jump pad, gdb_collect, etc. */
4116 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4117 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4118 && thread
->last_resume_kind
!= resume_step
4119 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4122 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4127 lwp
->status_pending_p
= 0;
4128 enqueue_one_deferred_signal (lwp
, wstat
);
4131 debug_printf ("Signal %d for LWP %ld deferred "
4133 WSTOPSIG (*wstat
), lwpid_of (thread
));
4136 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4139 lwp_suspended_inc (lwp
);
4141 current_thread
= saved_thread
;
4145 lwp_running (struct inferior_list_entry
*entry
, void *data
)
4147 struct thread_info
*thread
= (struct thread_info
*) entry
;
4148 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4150 if (lwp_is_marked_dead (lwp
))
4157 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4158 If SUSPEND, then also increase the suspend count of every LWP,
4162 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4164 /* Should not be called recursively. */
4165 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4170 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4171 suspend
? "stop-and-suspend" : "stop",
4173 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4177 stopping_threads
= (suspend
4178 ? STOPPING_AND_SUSPENDING_THREADS
4179 : STOPPING_THREADS
);
4182 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
4184 find_inferior (&all_threads
, send_sigstop_callback
, except
);
4185 wait_for_sigstop ();
4186 stopping_threads
= NOT_STOPPING_THREADS
;
4190 debug_printf ("stop_all_lwps done, setting stopping_threads "
4191 "back to !stopping\n");
4196 /* Enqueue one signal in the chain of signals which need to be
4197 delivered to this process on next resume. */
4200 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4202 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4204 p_sig
->prev
= lwp
->pending_signals
;
4205 p_sig
->signal
= signal
;
4207 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4209 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4210 lwp
->pending_signals
= p_sig
;
4213 /* Install breakpoints for software single stepping. */
4216 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4220 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4221 VEC (CORE_ADDR
) *next_pcs
= NULL
;
4222 struct cleanup
*old_chain
= make_cleanup (VEC_cleanup (CORE_ADDR
), &next_pcs
);
4224 next_pcs
= (*the_low_target
.get_next_pcs
) (regcache
);
4226 for (i
= 0; VEC_iterate (CORE_ADDR
, next_pcs
, i
, pc
); ++i
)
4227 set_reinsert_breakpoint (pc
);
4229 do_cleanups (old_chain
);
4232 /* Single step via hardware or software single step.
4233 Return 1 if hardware single stepping, 0 if software single stepping
4234 or can't single step. */
4237 single_step (struct lwp_info
* lwp
)
4241 if (can_hardware_single_step ())
4245 else if (can_software_single_step ())
4247 install_software_single_step_breakpoints (lwp
);
4253 debug_printf ("stepping is not implemented on this target");
4259 /* The signal can be delivered to the inferior if we are not trying to
4260 finish a fast tracepoint collect. Since signal can be delivered in
4261 the step-over, the program may go to signal handler and trap again
4262 after return from the signal handler. We can live with the spurious
4266 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4268 return !lwp
->collecting_fast_tracepoint
;
4271 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4272 SIGNAL is nonzero, give it that signal. */
4275 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4276 int step
, int signal
, siginfo_t
*info
)
4278 struct thread_info
*thread
= get_lwp_thread (lwp
);
4279 struct thread_info
*saved_thread
;
4280 int fast_tp_collecting
;
4282 struct process_info
*proc
= get_thread_process (thread
);
4284 /* Note that target description may not be initialised
4285 (proc->tdesc == NULL) at this point because the program hasn't
4286 stopped at the first instruction yet. It means GDBserver skips
4287 the extra traps from the wrapper program (see option --wrapper).
4288 Code in this function that requires register access should be
4289 guarded by proc->tdesc == NULL or something else. */
4291 if (lwp
->stopped
== 0)
4294 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4296 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
4298 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
4300 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4301 user used the "jump" command, or "set $pc = foo"). */
4302 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4304 /* Collecting 'while-stepping' actions doesn't make sense
4306 release_while_stepping_state_list (thread
);
4309 /* If we have pending signals or status, and a new signal, enqueue the
4310 signal. Also enqueue the signal if it can't be delivered to the
4311 inferior right now. */
4313 && (lwp
->status_pending_p
4314 || lwp
->pending_signals
!= NULL
4315 || !lwp_signal_can_be_delivered (lwp
)))
4317 enqueue_pending_signal (lwp
, signal
, info
);
4319 /* Postpone any pending signal. It was enqueued above. */
4323 if (lwp
->status_pending_p
)
4326 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4327 " has pending status\n",
4328 lwpid_of (thread
), step
? "step" : "continue",
4329 lwp
->stop_expected
? "expected" : "not expected");
4333 saved_thread
= current_thread
;
4334 current_thread
= thread
;
4336 /* This bit needs some thinking about. If we get a signal that
4337 we must report while a single-step reinsert is still pending,
4338 we often end up resuming the thread. It might be better to
4339 (ew) allow a stack of pending events; then we could be sure that
4340 the reinsert happened right away and not lose any signals.
4342 Making this stack would also shrink the window in which breakpoints are
4343 uninserted (see comment in linux_wait_for_lwp) but not enough for
4344 complete correctness, so it won't solve that problem. It may be
4345 worthwhile just to solve this one, however. */
4346 if (lwp
->bp_reinsert
!= 0)
4349 debug_printf (" pending reinsert at 0x%s\n",
4350 paddress (lwp
->bp_reinsert
));
4352 if (can_hardware_single_step ())
4354 if (fast_tp_collecting
== 0)
4357 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
4359 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
4364 step
= maybe_hw_step (thread
);
4368 /* If the thread isn't doing step-over, there shouldn't be any
4369 reinsert breakpoints. */
4370 gdb_assert (!has_reinsert_breakpoints (proc
));
4373 if (fast_tp_collecting
== 1)
4376 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4377 " (exit-jump-pad-bkpt)\n",
4380 else if (fast_tp_collecting
== 2)
4383 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4384 " single-stepping\n",
4387 if (can_hardware_single_step ())
4391 internal_error (__FILE__
, __LINE__
,
4392 "moving out of jump pad single-stepping"
4393 " not implemented on this target");
4397 /* If we have while-stepping actions in this thread set it stepping.
4398 If we have a signal to deliver, it may or may not be set to
4399 SIG_IGN, we don't know. Assume so, and allow collecting
4400 while-stepping into a signal handler. A possible smart thing to
4401 do would be to set an internal breakpoint at the signal return
4402 address, continue, and carry on catching this while-stepping
4403 action only when that breakpoint is hit. A future
4405 if (thread
->while_stepping
!= NULL
)
4408 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4411 step
= single_step (lwp
);
4414 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4416 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4418 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4422 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4423 (long) lwp
->stop_pc
);
4427 /* If we have pending signals, consume one if it can be delivered to
4429 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4431 struct pending_signals
**p_sig
;
4433 p_sig
= &lwp
->pending_signals
;
4434 while ((*p_sig
)->prev
!= NULL
)
4435 p_sig
= &(*p_sig
)->prev
;
4437 signal
= (*p_sig
)->signal
;
4438 if ((*p_sig
)->info
.si_signo
!= 0)
4439 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4447 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4448 lwpid_of (thread
), step
? "step" : "continue", signal
,
4449 lwp
->stop_expected
? "expected" : "not expected");
4451 if (the_low_target
.prepare_to_resume
!= NULL
)
4452 the_low_target
.prepare_to_resume (lwp
);
4454 regcache_invalidate_thread (thread
);
4456 lwp
->stepping
= step
;
4458 ptrace_request
= PTRACE_SINGLESTEP
;
4459 else if (gdb_catching_syscalls_p (lwp
))
4460 ptrace_request
= PTRACE_SYSCALL
;
4462 ptrace_request
= PTRACE_CONT
;
4463 ptrace (ptrace_request
,
4465 (PTRACE_TYPE_ARG3
) 0,
4466 /* Coerce to a uintptr_t first to avoid potential gcc warning
4467 of coercing an 8 byte integer to a 4 byte pointer. */
4468 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4470 current_thread
= saved_thread
;
4472 perror_with_name ("resuming thread");
4474 /* Successfully resumed. Clear state that no longer makes sense,
4475 and mark the LWP as running. Must not do this before resuming
4476 otherwise if that fails other code will be confused. E.g., we'd
4477 later try to stop the LWP and hang forever waiting for a stop
4478 status. Note that we must not throw after this is cleared,
4479 otherwise handle_zombie_lwp_error would get confused. */
4481 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4484 /* Called when we try to resume a stopped LWP and that errors out. If
4485 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4486 or about to become), discard the error, clear any pending status
4487 the LWP may have, and return true (we'll collect the exit status
4488 soon enough). Otherwise, return false. */
4491 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4493 struct thread_info
*thread
= get_lwp_thread (lp
);
4495 /* If we get an error after resuming the LWP successfully, we'd
4496 confuse !T state for the LWP being gone. */
4497 gdb_assert (lp
->stopped
);
4499 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4500 because even if ptrace failed with ESRCH, the tracee may be "not
4501 yet fully dead", but already refusing ptrace requests. In that
4502 case the tracee has 'R (Running)' state for a little bit
4503 (observed in Linux 3.18). See also the note on ESRCH in the
4504 ptrace(2) man page. Instead, check whether the LWP has any state
4505 other than ptrace-stopped. */
4507 /* Don't assume anything if /proc/PID/status can't be read. */
4508 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4510 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4511 lp
->status_pending_p
= 0;
4517 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4518 disappears while we try to resume it. */
4521 linux_resume_one_lwp (struct lwp_info
*lwp
,
4522 int step
, int signal
, siginfo_t
*info
)
4526 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4528 CATCH (ex
, RETURN_MASK_ERROR
)
4530 if (!check_ptrace_stopped_lwp_gone (lwp
))
4531 throw_exception (ex
);
4536 struct thread_resume_array
4538 struct thread_resume
*resume
;
4542 /* This function is called once per thread via find_inferior.
4543 ARG is a pointer to a thread_resume_array struct.
4544 We look up the thread specified by ENTRY in ARG, and mark the thread
4545 with a pointer to the appropriate resume request.
4547 This algorithm is O(threads * resume elements), but resume elements
4548 is small (and will remain small at least until GDB supports thread
4552 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
4554 struct thread_info
*thread
= (struct thread_info
*) entry
;
4555 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4557 struct thread_resume_array
*r
;
4559 r
= (struct thread_resume_array
*) arg
;
4561 for (ndx
= 0; ndx
< r
->n
; ndx
++)
4563 ptid_t ptid
= r
->resume
[ndx
].thread
;
4564 if (ptid_equal (ptid
, minus_one_ptid
)
4565 || ptid_equal (ptid
, entry
->id
)
4566 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4568 || (ptid_get_pid (ptid
) == pid_of (thread
)
4569 && (ptid_is_pid (ptid
)
4570 || ptid_get_lwp (ptid
) == -1)))
4572 if (r
->resume
[ndx
].kind
== resume_stop
4573 && thread
->last_resume_kind
== resume_stop
)
4576 debug_printf ("already %s LWP %ld at GDB's request\n",
4577 (thread
->last_status
.kind
4578 == TARGET_WAITKIND_STOPPED
)
4586 lwp
->resume
= &r
->resume
[ndx
];
4587 thread
->last_resume_kind
= lwp
->resume
->kind
;
4589 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4590 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4592 /* If we had a deferred signal to report, dequeue one now.
4593 This can happen if LWP gets more than one signal while
4594 trying to get out of a jump pad. */
4596 && !lwp
->status_pending_p
4597 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4599 lwp
->status_pending_p
= 1;
4602 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4603 "leaving status pending.\n",
4604 WSTOPSIG (lwp
->status_pending
),
4612 /* No resume action for this thread. */
4618 /* find_inferior callback for linux_resume.
4619 Set *FLAG_P if this lwp has an interesting status pending. */
4622 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
4624 struct thread_info
*thread
= (struct thread_info
*) entry
;
4625 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4627 /* LWPs which will not be resumed are not interesting, because
4628 we might not wait for them next time through linux_wait. */
4629 if (lwp
->resume
== NULL
)
4632 if (thread_still_has_status_pending_p (thread
))
4633 * (int *) flag_p
= 1;
4638 /* Return 1 if this lwp that GDB wants running is stopped at an
4639 internal breakpoint that we need to step over. It assumes that any
4640 required STOP_PC adjustment has already been propagated to the
4641 inferior's regcache. */
4644 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
4646 struct thread_info
*thread
= (struct thread_info
*) entry
;
4647 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4648 struct thread_info
*saved_thread
;
4650 struct process_info
*proc
= get_thread_process (thread
);
4652 /* GDBserver is skipping the extra traps from the wrapper program,
4653 don't have to do step over. */
4654 if (proc
->tdesc
== NULL
)
4657 /* LWPs which will not be resumed are not interesting, because we
4658 might not wait for them next time through linux_wait. */
4663 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4668 if (thread
->last_resume_kind
== resume_stop
)
4671 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4677 gdb_assert (lwp
->suspended
>= 0);
4682 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4687 if (lwp
->status_pending_p
)
4690 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4696 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4700 /* If the PC has changed since we stopped, then don't do anything,
4701 and let the breakpoint/tracepoint be hit. This happens if, for
4702 instance, GDB handled the decr_pc_after_break subtraction itself,
4703 GDB is OOL stepping this thread, or the user has issued a "jump"
4704 command, or poked thread's registers herself. */
4705 if (pc
!= lwp
->stop_pc
)
4708 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4709 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4711 paddress (lwp
->stop_pc
), paddress (pc
));
4715 /* On software single step target, resume the inferior with signal
4716 rather than stepping over. */
4717 if (can_software_single_step ()
4718 && lwp
->pending_signals
!= NULL
4719 && lwp_signal_can_be_delivered (lwp
))
4722 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4729 saved_thread
= current_thread
;
4730 current_thread
= thread
;
4732 /* We can only step over breakpoints we know about. */
4733 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4735 /* Don't step over a breakpoint that GDB expects to hit
4736 though. If the condition is being evaluated on the target's side
4737 and it evaluate to false, step over this breakpoint as well. */
4738 if (gdb_breakpoint_here (pc
)
4739 && gdb_condition_true_at_breakpoint (pc
)
4740 && gdb_no_commands_at_breakpoint (pc
))
4743 debug_printf ("Need step over [LWP %ld]? yes, but found"
4744 " GDB breakpoint at 0x%s; skipping step over\n",
4745 lwpid_of (thread
), paddress (pc
));
4747 current_thread
= saved_thread
;
4753 debug_printf ("Need step over [LWP %ld]? yes, "
4754 "found breakpoint at 0x%s\n",
4755 lwpid_of (thread
), paddress (pc
));
4757 /* We've found an lwp that needs stepping over --- return 1 so
4758 that find_inferior stops looking. */
4759 current_thread
= saved_thread
;
4765 current_thread
= saved_thread
;
4768 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4770 lwpid_of (thread
), paddress (pc
));
4775 /* Start a step-over operation on LWP. When LWP stopped at a
4776 breakpoint, to make progress, we need to remove the breakpoint out
4777 of the way. If we let other threads run while we do that, they may
4778 pass by the breakpoint location and miss hitting it. To avoid
4779 that, a step-over momentarily stops all threads while LWP is
4780 single-stepped by either hardware or software while the breakpoint
4781 is temporarily uninserted from the inferior. When the single-step
4782 finishes, we reinsert the breakpoint, and let all threads that are
4783 supposed to be running, run again. */
4786 start_step_over (struct lwp_info
*lwp
)
4788 struct thread_info
*thread
= get_lwp_thread (lwp
);
4789 struct thread_info
*saved_thread
;
4794 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4797 stop_all_lwps (1, lwp
);
4799 if (lwp
->suspended
!= 0)
4801 internal_error (__FILE__
, __LINE__
,
4802 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4807 debug_printf ("Done stopping all threads for step-over.\n");
4809 /* Note, we should always reach here with an already adjusted PC,
4810 either by GDB (if we're resuming due to GDB's request), or by our
4811 caller, if we just finished handling an internal breakpoint GDB
4812 shouldn't care about. */
4815 saved_thread
= current_thread
;
4816 current_thread
= thread
;
4818 lwp
->bp_reinsert
= pc
;
4819 uninsert_breakpoints_at (pc
);
4820 uninsert_fast_tracepoint_jumps_at (pc
);
4822 step
= single_step (lwp
);
4824 current_thread
= saved_thread
;
4826 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4828 /* Require next event from this LWP. */
4829 step_over_bkpt
= thread
->entry
.id
;
4833 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4834 start_step_over, if still there, and delete any reinsert
4835 breakpoints we've set, on non hardware single-step targets. */
4838 finish_step_over (struct lwp_info
*lwp
)
4840 if (lwp
->bp_reinsert
!= 0)
4842 struct thread_info
*saved_thread
= current_thread
;
4845 debug_printf ("Finished step over.\n");
4847 current_thread
= get_lwp_thread (lwp
);
4849 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4850 may be no breakpoint to reinsert there by now. */
4851 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4852 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4854 lwp
->bp_reinsert
= 0;
4856 /* Delete any software-single-step reinsert breakpoints. No
4857 longer needed. We don't have to worry about other threads
4858 hitting this trap, and later not being able to explain it,
4859 because we were stepping over a breakpoint, and we hold all
4860 threads but LWP stopped while doing that. */
4861 if (!can_hardware_single_step ())
4863 gdb_assert (has_reinsert_breakpoints (current_process ()));
4864 delete_reinsert_breakpoints ();
4867 step_over_bkpt
= null_ptid
;
4868 current_thread
= saved_thread
;
4875 /* If there's a step over in progress, wait until all threads stop
4876 (that is, until the stepping thread finishes its step), and
4877 unsuspend all lwps. The stepping thread ends with its status
4878 pending, which is processed later when we get back to processing
4882 complete_ongoing_step_over (void)
4884 if (!ptid_equal (step_over_bkpt
, null_ptid
))
4886 struct lwp_info
*lwp
;
4891 debug_printf ("detach: step over in progress, finish it first\n");
4893 /* Passing NULL_PTID as filter indicates we want all events to
4894 be left pending. Eventually this returns when there are no
4895 unwaited-for children left. */
4896 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4898 gdb_assert (ret
== -1);
4900 lwp
= find_lwp_pid (step_over_bkpt
);
4902 finish_step_over (lwp
);
4903 step_over_bkpt
= null_ptid
;
4904 unsuspend_all_lwps (lwp
);
4908 /* This function is called once per thread. We check the thread's resume
4909 request, which will tell us whether to resume, step, or leave the thread
4910 stopped; and what signal, if any, it should be sent.
4912 For threads which we aren't explicitly told otherwise, we preserve
4913 the stepping flag; this is used for stepping over gdbserver-placed
4916 If pending_flags was set in any thread, we queue any needed
4917 signals, since we won't actually resume. We already have a pending
4918 event to report, so we don't need to preserve any step requests;
4919 they should be re-issued if necessary. */
4922 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
4924 struct thread_info
*thread
= (struct thread_info
*) entry
;
4925 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4927 int leave_all_stopped
= * (int *) arg
;
4930 if (lwp
->resume
== NULL
)
4933 if (lwp
->resume
->kind
== resume_stop
)
4936 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4941 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
4943 /* Stop the thread, and wait for the event asynchronously,
4944 through the event loop. */
4950 debug_printf ("already stopped LWP %ld\n",
4953 /* The LWP may have been stopped in an internal event that
4954 was not meant to be notified back to GDB (e.g., gdbserver
4955 breakpoint), so we should be reporting a stop event in
4958 /* If the thread already has a pending SIGSTOP, this is a
4959 no-op. Otherwise, something later will presumably resume
4960 the thread and this will cause it to cancel any pending
4961 operation, due to last_resume_kind == resume_stop. If
4962 the thread already has a pending status to report, we
4963 will still report it the next time we wait - see
4964 status_pending_p_callback. */
4966 /* If we already have a pending signal to report, then
4967 there's no need to queue a SIGSTOP, as this means we're
4968 midway through moving the LWP out of the jumppad, and we
4969 will report the pending signal as soon as that is
4971 if (lwp
->pending_signals_to_report
== NULL
)
4975 /* For stop requests, we're done. */
4977 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4981 /* If this thread which is about to be resumed has a pending status,
4982 then don't resume it - we can just report the pending status.
4983 Likewise if it is suspended, because e.g., another thread is
4984 stepping past a breakpoint. Make sure to queue any signals that
4985 would otherwise be sent. In all-stop mode, we do this decision
4986 based on if *any* thread has a pending status. If there's a
4987 thread that needs the step-over-breakpoint dance, then don't
4988 resume any other thread but that particular one. */
4989 leave_pending
= (lwp
->suspended
4990 || lwp
->status_pending_p
4991 || leave_all_stopped
);
4996 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
4998 step
= (lwp
->resume
->kind
== resume_step
);
4999 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
5004 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5006 /* If we have a new signal, enqueue the signal. */
5007 if (lwp
->resume
->sig
!= 0)
5009 struct pending_signals
*p_sig
= XCNEW (struct pending_signals
);
5011 p_sig
->prev
= lwp
->pending_signals
;
5012 p_sig
->signal
= lwp
->resume
->sig
;
5014 /* If this is the same signal we were previously stopped by,
5015 make sure to queue its siginfo. We can ignore the return
5016 value of ptrace; if it fails, we'll skip
5017 PTRACE_SETSIGINFO. */
5018 if (WIFSTOPPED (lwp
->last_status
)
5019 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
5020 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
5023 lwp
->pending_signals
= p_sig
;
5027 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5033 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5035 struct thread_resume_array array
= { resume_info
, n
};
5036 struct thread_info
*need_step_over
= NULL
;
5038 int leave_all_stopped
;
5043 debug_printf ("linux_resume:\n");
5046 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
5048 /* If there is a thread which would otherwise be resumed, which has
5049 a pending status, then don't resume any threads - we can just
5050 report the pending status. Make sure to queue any signals that
5051 would otherwise be sent. In non-stop mode, we'll apply this
5052 logic to each thread individually. We consume all pending events
5053 before considering to start a step-over (in all-stop). */
5056 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
5058 /* If there is a thread which would otherwise be resumed, which is
5059 stopped at a breakpoint that needs stepping over, then don't
5060 resume any threads - have it step over the breakpoint with all
5061 other threads stopped, then resume all threads again. Make sure
5062 to queue any signals that would otherwise be delivered or
5064 if (!any_pending
&& supports_breakpoints ())
5066 = (struct thread_info
*) find_inferior (&all_threads
,
5067 need_step_over_p
, NULL
);
5069 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5073 if (need_step_over
!= NULL
)
5074 debug_printf ("Not resuming all, need step over\n");
5075 else if (any_pending
)
5076 debug_printf ("Not resuming, all-stop and found "
5077 "an LWP with pending status\n");
5079 debug_printf ("Resuming, no pending status or step over needed\n");
5082 /* Even if we're leaving threads stopped, queue all signals we'd
5083 otherwise deliver. */
5084 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
5087 start_step_over (get_thread_lwp (need_step_over
));
5091 debug_printf ("linux_resume done\n");
5095 /* We may have events that were pending that can/should be sent to
5096 the client now. Trigger a linux_wait call. */
5097 if (target_is_async_p ())
5101 /* This function is called once per thread. We check the thread's
5102 last resume request, which will tell us whether to resume, step, or
5103 leave the thread stopped. Any signal the client requested to be
5104 delivered has already been enqueued at this point.
5106 If any thread that GDB wants running is stopped at an internal
5107 breakpoint that needs stepping over, we start a step-over operation
5108 on that particular thread, and leave all others stopped. */
5111 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
5113 struct thread_info
*thread
= (struct thread_info
*) entry
;
5114 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5121 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5126 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5130 if (thread
->last_resume_kind
== resume_stop
5131 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5134 debug_printf (" client wants LWP to remain %ld stopped\n",
5139 if (lwp
->status_pending_p
)
5142 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5147 gdb_assert (lwp
->suspended
>= 0);
5152 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5156 if (thread
->last_resume_kind
== resume_stop
5157 && lwp
->pending_signals_to_report
== NULL
5158 && lwp
->collecting_fast_tracepoint
== 0)
5160 /* We haven't reported this LWP as stopped yet (otherwise, the
5161 last_status.kind check above would catch it, and we wouldn't
5162 reach here. This LWP may have been momentarily paused by a
5163 stop_all_lwps call while handling for example, another LWP's
5164 step-over. In that case, the pending expected SIGSTOP signal
5165 that was queued at vCont;t handling time will have already
5166 been consumed by wait_for_sigstop, and so we need to requeue
5167 another one here. Note that if the LWP already has a SIGSTOP
5168 pending, this is a no-op. */
5171 debug_printf ("Client wants LWP %ld to stop. "
5172 "Making sure it has a SIGSTOP pending\n",
5178 if (thread
->last_resume_kind
== resume_step
)
5181 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5185 else if (lwp
->bp_reinsert
!= 0)
5188 debug_printf (" stepping LWP %ld, reinsert set\n",
5191 step
= maybe_hw_step (thread
);
5196 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5201 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
5203 struct thread_info
*thread
= (struct thread_info
*) entry
;
5204 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5209 lwp_suspended_decr (lwp
);
5211 return proceed_one_lwp (entry
, except
);
5214 /* When we finish a step-over, set threads running again. If there's
5215 another thread that may need a step-over, now's the time to start
5216 it. Eventually, we'll move all threads past their breakpoints. */
5219 proceed_all_lwps (void)
5221 struct thread_info
*need_step_over
;
5223 /* If there is a thread which would otherwise be resumed, which is
5224 stopped at a breakpoint that needs stepping over, then don't
5225 resume any threads - have it step over the breakpoint with all
5226 other threads stopped, then resume all threads again. */
5228 if (supports_breakpoints ())
5231 = (struct thread_info
*) find_inferior (&all_threads
,
5232 need_step_over_p
, NULL
);
5234 if (need_step_over
!= NULL
)
5237 debug_printf ("proceed_all_lwps: found "
5238 "thread %ld needing a step-over\n",
5239 lwpid_of (need_step_over
));
5241 start_step_over (get_thread_lwp (need_step_over
));
5247 debug_printf ("Proceeding, no step-over needed\n");
5249 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
5252 /* Stopped LWPs that the client wanted to be running, that don't have
5253 pending statuses, are set to run again, except for EXCEPT, if not
5254 NULL. This undoes a stop_all_lwps call. */
5257 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5263 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5264 lwpid_of (get_lwp_thread (except
)));
5266 debug_printf ("unstopping all lwps\n");
5270 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
5272 find_inferior (&all_threads
, proceed_one_lwp
, except
);
5276 debug_printf ("unstop_all_lwps done\n");
5282 #ifdef HAVE_LINUX_REGSETS
5284 #define use_linux_regsets 1
5286 /* Returns true if REGSET has been disabled. */
5289 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5291 return (info
->disabled_regsets
!= NULL
5292 && info
->disabled_regsets
[regset
- info
->regsets
]);
5295 /* Disable REGSET. */
5298 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5302 dr_offset
= regset
- info
->regsets
;
5303 if (info
->disabled_regsets
== NULL
)
5304 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5305 info
->disabled_regsets
[dr_offset
] = 1;
5309 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5310 struct regcache
*regcache
)
5312 struct regset_info
*regset
;
5313 int saw_general_regs
= 0;
5317 pid
= lwpid_of (current_thread
);
5318 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5323 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5326 buf
= xmalloc (regset
->size
);
5328 nt_type
= regset
->nt_type
;
5332 iov
.iov_len
= regset
->size
;
5333 data
= (void *) &iov
;
5339 res
= ptrace (regset
->get_request
, pid
,
5340 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5342 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5348 /* If we get EIO on a regset, do not try it again for
5349 this process mode. */
5350 disable_regset (regsets_info
, regset
);
5352 else if (errno
== ENODATA
)
5354 /* ENODATA may be returned if the regset is currently
5355 not "active". This can happen in normal operation,
5356 so suppress the warning in this case. */
5361 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5368 if (regset
->type
== GENERAL_REGS
)
5369 saw_general_regs
= 1;
5370 regset
->store_function (regcache
, buf
);
5374 if (saw_general_regs
)
5381 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5382 struct regcache
*regcache
)
5384 struct regset_info
*regset
;
5385 int saw_general_regs
= 0;
5389 pid
= lwpid_of (current_thread
);
5390 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5395 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5396 || regset
->fill_function
== NULL
)
5399 buf
= xmalloc (regset
->size
);
5401 /* First fill the buffer with the current register set contents,
5402 in case there are any items in the kernel's regset that are
5403 not in gdbserver's regcache. */
5405 nt_type
= regset
->nt_type
;
5409 iov
.iov_len
= regset
->size
;
5410 data
= (void *) &iov
;
5416 res
= ptrace (regset
->get_request
, pid
,
5417 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5419 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5424 /* Then overlay our cached registers on that. */
5425 regset
->fill_function (regcache
, buf
);
5427 /* Only now do we write the register set. */
5429 res
= ptrace (regset
->set_request
, pid
,
5430 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5432 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5440 /* If we get EIO on a regset, do not try it again for
5441 this process mode. */
5442 disable_regset (regsets_info
, regset
);
5444 else if (errno
== ESRCH
)
5446 /* At this point, ESRCH should mean the process is
5447 already gone, in which case we simply ignore attempts
5448 to change its registers. See also the related
5449 comment in linux_resume_one_lwp. */
5455 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5458 else if (regset
->type
== GENERAL_REGS
)
5459 saw_general_regs
= 1;
5462 if (saw_general_regs
)
5468 #else /* !HAVE_LINUX_REGSETS */
5470 #define use_linux_regsets 0
5471 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5472 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5476 /* Return 1 if register REGNO is supported by one of the regset ptrace
5477 calls or 0 if it has to be transferred individually. */
5480 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5482 unsigned char mask
= 1 << (regno
% 8);
5483 size_t index
= regno
/ 8;
5485 return (use_linux_regsets
5486 && (regs_info
->regset_bitmap
== NULL
5487 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5490 #ifdef HAVE_LINUX_USRREGS
5493 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5497 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5498 error ("Invalid register number %d.", regnum
);
5500 addr
= usrregs
->regmap
[regnum
];
5505 /* Fetch one register. */
5507 fetch_register (const struct usrregs_info
*usrregs
,
5508 struct regcache
*regcache
, int regno
)
5515 if (regno
>= usrregs
->num_regs
)
5517 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5520 regaddr
= register_addr (usrregs
, regno
);
5524 size
= ((register_size (regcache
->tdesc
, regno
)
5525 + sizeof (PTRACE_XFER_TYPE
) - 1)
5526 & -sizeof (PTRACE_XFER_TYPE
));
5527 buf
= (char *) alloca (size
);
5529 pid
= lwpid_of (current_thread
);
5530 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5533 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5534 ptrace (PTRACE_PEEKUSER
, pid
,
5535 /* Coerce to a uintptr_t first to avoid potential gcc warning
5536 of coercing an 8 byte integer to a 4 byte pointer. */
5537 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5538 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5540 error ("reading register %d: %s", regno
, strerror (errno
));
5543 if (the_low_target
.supply_ptrace_register
)
5544 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5546 supply_register (regcache
, regno
, buf
);
5549 /* Store one register. */
5551 store_register (const struct usrregs_info
*usrregs
,
5552 struct regcache
*regcache
, int regno
)
5559 if (regno
>= usrregs
->num_regs
)
5561 if ((*the_low_target
.cannot_store_register
) (regno
))
5564 regaddr
= register_addr (usrregs
, regno
);
5568 size
= ((register_size (regcache
->tdesc
, regno
)
5569 + sizeof (PTRACE_XFER_TYPE
) - 1)
5570 & -sizeof (PTRACE_XFER_TYPE
));
5571 buf
= (char *) alloca (size
);
5572 memset (buf
, 0, size
);
5574 if (the_low_target
.collect_ptrace_register
)
5575 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5577 collect_register (regcache
, regno
, buf
);
5579 pid
= lwpid_of (current_thread
);
5580 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5583 ptrace (PTRACE_POKEUSER
, pid
,
5584 /* Coerce to a uintptr_t first to avoid potential gcc warning
5585 about coercing an 8 byte integer to a 4 byte pointer. */
5586 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5587 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5590 /* At this point, ESRCH should mean the process is
5591 already gone, in which case we simply ignore attempts
5592 to change its registers. See also the related
5593 comment in linux_resume_one_lwp. */
5597 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5598 error ("writing register %d: %s", regno
, strerror (errno
));
5600 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5604 /* Fetch all registers, or just one, from the child process.
5605 If REGNO is -1, do this for all registers, skipping any that are
5606 assumed to have been retrieved by regsets_fetch_inferior_registers,
5607 unless ALL is non-zero.
5608 Otherwise, REGNO specifies which register (so we can save time). */
5610 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5611 struct regcache
*regcache
, int regno
, int all
)
5613 struct usrregs_info
*usr
= regs_info
->usrregs
;
5617 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5618 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5619 fetch_register (usr
, regcache
, regno
);
5622 fetch_register (usr
, regcache
, regno
);
5625 /* Store our register values back into the inferior.
5626 If REGNO is -1, do this for all registers, skipping any that are
5627 assumed to have been saved by regsets_store_inferior_registers,
5628 unless ALL is non-zero.
5629 Otherwise, REGNO specifies which register (so we can save time). */
5631 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5632 struct regcache
*regcache
, int regno
, int all
)
5634 struct usrregs_info
*usr
= regs_info
->usrregs
;
5638 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5639 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5640 store_register (usr
, regcache
, regno
);
5643 store_register (usr
, regcache
, regno
);
5646 #else /* !HAVE_LINUX_USRREGS */
5648 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5649 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5655 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5659 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5663 if (the_low_target
.fetch_register
!= NULL
5664 && regs_info
->usrregs
!= NULL
)
5665 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5666 (*the_low_target
.fetch_register
) (regcache
, regno
);
5668 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5669 if (regs_info
->usrregs
!= NULL
)
5670 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5674 if (the_low_target
.fetch_register
!= NULL
5675 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5678 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5680 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5682 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5683 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5688 linux_store_registers (struct regcache
*regcache
, int regno
)
5692 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5696 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5698 if (regs_info
->usrregs
!= NULL
)
5699 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5703 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5705 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5707 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5708 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5713 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5714 to debugger memory starting at MYADDR. */
5717 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5719 int pid
= lwpid_of (current_thread
);
5720 register PTRACE_XFER_TYPE
*buffer
;
5721 register CORE_ADDR addr
;
5728 /* Try using /proc. Don't bother for one word. */
5729 if (len
>= 3 * sizeof (long))
5733 /* We could keep this file open and cache it - possibly one per
5734 thread. That requires some juggling, but is even faster. */
5735 sprintf (filename
, "/proc/%d/mem", pid
);
5736 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5740 /* If pread64 is available, use it. It's faster if the kernel
5741 supports it (only one syscall), and it's 64-bit safe even on
5742 32-bit platforms (for instance, SPARC debugging a SPARC64
5745 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5748 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5749 bytes
= read (fd
, myaddr
, len
);
5756 /* Some data was read, we'll try to get the rest with ptrace. */
5766 /* Round starting address down to longword boundary. */
5767 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5768 /* Round ending address up; get number of longwords that makes. */
5769 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5770 / sizeof (PTRACE_XFER_TYPE
));
5771 /* Allocate buffer of that many longwords. */
5772 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5774 /* Read all the longwords */
5776 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5778 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5779 about coercing an 8 byte integer to a 4 byte pointer. */
5780 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5781 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5782 (PTRACE_TYPE_ARG4
) 0);
5788 /* Copy appropriate bytes out of the buffer. */
5791 i
*= sizeof (PTRACE_XFER_TYPE
);
5792 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5794 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5801 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5802 memory at MEMADDR. On failure (cannot write to the inferior)
5803 returns the value of errno. Always succeeds if LEN is zero. */
5806 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5809 /* Round starting address down to longword boundary. */
5810 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5811 /* Round ending address up; get number of longwords that makes. */
5813 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5814 / sizeof (PTRACE_XFER_TYPE
);
5816 /* Allocate buffer of that many longwords. */
5817 register PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5819 int pid
= lwpid_of (current_thread
);
5823 /* Zero length write always succeeds. */
5829 /* Dump up to four bytes. */
5830 char str
[4 * 2 + 1];
5832 int dump
= len
< 4 ? len
: 4;
5834 for (i
= 0; i
< dump
; i
++)
5836 sprintf (p
, "%02x", myaddr
[i
]);
5841 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5842 str
, (long) memaddr
, pid
);
5845 /* Fill start and end extra bytes of buffer with existing memory data. */
5848 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5849 about coercing an 8 byte integer to a 4 byte pointer. */
5850 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5851 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5852 (PTRACE_TYPE_ARG4
) 0);
5860 = ptrace (PTRACE_PEEKTEXT
, pid
,
5861 /* Coerce to a uintptr_t first to avoid potential gcc warning
5862 about coercing an 8 byte integer to a 4 byte pointer. */
5863 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5864 * sizeof (PTRACE_XFER_TYPE
)),
5865 (PTRACE_TYPE_ARG4
) 0);
5870 /* Copy data to be written over corresponding part of buffer. */
5872 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5875 /* Write the entire buffer. */
5877 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5880 ptrace (PTRACE_POKETEXT
, pid
,
5881 /* Coerce to a uintptr_t first to avoid potential gcc warning
5882 about coercing an 8 byte integer to a 4 byte pointer. */
5883 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5884 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5893 linux_look_up_symbols (void)
5895 #ifdef USE_THREAD_DB
5896 struct process_info
*proc
= current_process ();
5898 if (proc
->priv
->thread_db
!= NULL
)
5906 linux_request_interrupt (void)
5908 extern unsigned long signal_pid
;
5910 /* Send a SIGINT to the process group. This acts just like the user
5911 typed a ^C on the controlling terminal. */
5912 kill (-signal_pid
, SIGINT
);
5915 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5916 to debugger memory starting at MYADDR. */
5919 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5921 char filename
[PATH_MAX
];
5923 int pid
= lwpid_of (current_thread
);
5925 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5927 fd
= open (filename
, O_RDONLY
);
5931 if (offset
!= (CORE_ADDR
) 0
5932 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5935 n
= read (fd
, myaddr
, len
);
5942 /* These breakpoint and watchpoint related wrapper functions simply
5943 pass on the function call if the target has registered a
5944 corresponding function. */
5947 linux_supports_z_point_type (char z_type
)
5949 return (the_low_target
.supports_z_point_type
!= NULL
5950 && the_low_target
.supports_z_point_type (z_type
));
5954 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5955 int size
, struct raw_breakpoint
*bp
)
5957 if (type
== raw_bkpt_type_sw
)
5958 return insert_memory_breakpoint (bp
);
5959 else if (the_low_target
.insert_point
!= NULL
)
5960 return the_low_target
.insert_point (type
, addr
, size
, bp
);
5962 /* Unsupported (see target.h). */
5967 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5968 int size
, struct raw_breakpoint
*bp
)
5970 if (type
== raw_bkpt_type_sw
)
5971 return remove_memory_breakpoint (bp
);
5972 else if (the_low_target
.remove_point
!= NULL
)
5973 return the_low_target
.remove_point (type
, addr
, size
, bp
);
5975 /* Unsupported (see target.h). */
5979 /* Implement the to_stopped_by_sw_breakpoint target_ops
5983 linux_stopped_by_sw_breakpoint (void)
5985 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5987 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
5990 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
5994 linux_supports_stopped_by_sw_breakpoint (void)
5996 return USE_SIGTRAP_SIGINFO
;
5999 /* Implement the to_stopped_by_hw_breakpoint target_ops
6003 linux_stopped_by_hw_breakpoint (void)
6005 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6007 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6010 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6014 linux_supports_stopped_by_hw_breakpoint (void)
6016 return USE_SIGTRAP_SIGINFO
;
6019 /* Implement the supports_hardware_single_step target_ops method. */
6022 linux_supports_hardware_single_step (void)
6024 return can_hardware_single_step ();
6028 linux_supports_software_single_step (void)
6030 return can_software_single_step ();
6034 linux_stopped_by_watchpoint (void)
6036 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6038 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6042 linux_stopped_data_address (void)
6044 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6046 return lwp
->stopped_data_address
;
6049 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6050 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6051 && defined(PT_TEXT_END_ADDR)
6053 /* This is only used for targets that define PT_TEXT_ADDR,
6054 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6055 the target has different ways of acquiring this information, like
6058 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6059 to tell gdb about. */
6062 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6064 unsigned long text
, text_end
, data
;
6065 int pid
= lwpid_of (current_thread
);
6069 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6070 (PTRACE_TYPE_ARG4
) 0);
6071 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6072 (PTRACE_TYPE_ARG4
) 0);
6073 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6074 (PTRACE_TYPE_ARG4
) 0);
6078 /* Both text and data offsets produced at compile-time (and so
6079 used by gdb) are relative to the beginning of the program,
6080 with the data segment immediately following the text segment.
6081 However, the actual runtime layout in memory may put the data
6082 somewhere else, so when we send gdb a data base-address, we
6083 use the real data base address and subtract the compile-time
6084 data base-address from it (which is just the length of the
6085 text segment). BSS immediately follows data in both
6088 *data_p
= data
- (text_end
- text
);
6097 linux_qxfer_osdata (const char *annex
,
6098 unsigned char *readbuf
, unsigned const char *writebuf
,
6099 CORE_ADDR offset
, int len
)
6101 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6104 /* Convert a native/host siginfo object, into/from the siginfo in the
6105 layout of the inferiors' architecture. */
6108 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6112 if (the_low_target
.siginfo_fixup
!= NULL
)
6113 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6115 /* If there was no callback, or the callback didn't do anything,
6116 then just do a straight memcpy. */
6120 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6122 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6127 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6128 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6132 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6134 if (current_thread
== NULL
)
6137 pid
= lwpid_of (current_thread
);
6140 debug_printf ("%s siginfo for lwp %d.\n",
6141 readbuf
!= NULL
? "Reading" : "Writing",
6144 if (offset
>= sizeof (siginfo
))
6147 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6150 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6151 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6152 inferior with a 64-bit GDBSERVER should look the same as debugging it
6153 with a 32-bit GDBSERVER, we need to convert it. */
6154 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6156 if (offset
+ len
> sizeof (siginfo
))
6157 len
= sizeof (siginfo
) - offset
;
6159 if (readbuf
!= NULL
)
6160 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6163 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6165 /* Convert back to ptrace layout before flushing it out. */
6166 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6168 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6175 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6176 so we notice when children change state; as the handler for the
6177 sigsuspend in my_waitpid. */
6180 sigchld_handler (int signo
)
6182 int old_errno
= errno
;
6188 /* fprintf is not async-signal-safe, so call write
6190 if (write (2, "sigchld_handler\n",
6191 sizeof ("sigchld_handler\n") - 1) < 0)
6192 break; /* just ignore */
6196 if (target_is_async_p ())
6197 async_file_mark (); /* trigger a linux_wait */
6203 linux_supports_non_stop (void)
6209 linux_async (int enable
)
6211 int previous
= target_is_async_p ();
6214 debug_printf ("linux_async (%d), previous=%d\n",
6217 if (previous
!= enable
)
6220 sigemptyset (&mask
);
6221 sigaddset (&mask
, SIGCHLD
);
6223 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6227 if (pipe (linux_event_pipe
) == -1)
6229 linux_event_pipe
[0] = -1;
6230 linux_event_pipe
[1] = -1;
6231 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6233 warning ("creating event pipe failed.");
6237 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6238 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6240 /* Register the event loop handler. */
6241 add_file_handler (linux_event_pipe
[0],
6242 handle_target_event
, NULL
);
6244 /* Always trigger a linux_wait. */
6249 delete_file_handler (linux_event_pipe
[0]);
6251 close (linux_event_pipe
[0]);
6252 close (linux_event_pipe
[1]);
6253 linux_event_pipe
[0] = -1;
6254 linux_event_pipe
[1] = -1;
6257 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6264 linux_start_non_stop (int nonstop
)
6266 /* Register or unregister from event-loop accordingly. */
6267 linux_async (nonstop
);
6269 if (target_is_async_p () != (nonstop
!= 0))
6276 linux_supports_multi_process (void)
6281 /* Check if fork events are supported. */
6284 linux_supports_fork_events (void)
6286 return linux_supports_tracefork ();
6289 /* Check if vfork events are supported. */
6292 linux_supports_vfork_events (void)
6294 return linux_supports_tracefork ();
6297 /* Check if exec events are supported. */
6300 linux_supports_exec_events (void)
6302 return linux_supports_traceexec ();
6305 /* Callback for 'find_inferior'. Set the (possibly changed) ptrace
6306 options for the specified lwp. */
6309 reset_lwp_ptrace_options_callback (struct inferior_list_entry
*entry
,
6312 struct thread_info
*thread
= (struct thread_info
*) entry
;
6313 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6317 /* Stop the lwp so we can modify its ptrace options. */
6318 lwp
->must_set_ptrace_flags
= 1;
6319 linux_stop_lwp (lwp
);
6323 /* Already stopped; go ahead and set the ptrace options. */
6324 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6325 int options
= linux_low_ptrace_options (proc
->attached
);
6327 linux_enable_event_reporting (lwpid_of (thread
), options
);
6328 lwp
->must_set_ptrace_flags
= 0;
6334 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6335 ptrace flags for all inferiors. This is in case the new GDB connection
6336 doesn't support the same set of events that the previous one did. */
6339 linux_handle_new_gdb_connection (void)
6343 /* Request that all the lwps reset their ptrace options. */
6344 find_inferior (&all_threads
, reset_lwp_ptrace_options_callback
, &pid
);
6348 linux_supports_disable_randomization (void)
6350 #ifdef HAVE_PERSONALITY
6358 linux_supports_agent (void)
6364 linux_supports_range_stepping (void)
6366 if (*the_low_target
.supports_range_stepping
== NULL
)
6369 return (*the_low_target
.supports_range_stepping
) ();
6372 /* Enumerate spufs IDs for process PID. */
6374 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6380 struct dirent
*entry
;
6382 sprintf (path
, "/proc/%ld/fd", pid
);
6383 dir
= opendir (path
);
6388 while ((entry
= readdir (dir
)) != NULL
)
6394 fd
= atoi (entry
->d_name
);
6398 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6399 if (stat (path
, &st
) != 0)
6401 if (!S_ISDIR (st
.st_mode
))
6404 if (statfs (path
, &stfs
) != 0)
6406 if (stfs
.f_type
!= SPUFS_MAGIC
)
6409 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6411 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6421 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6422 object type, using the /proc file system. */
6424 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6425 unsigned const char *writebuf
,
6426 CORE_ADDR offset
, int len
)
6428 long pid
= lwpid_of (current_thread
);
6433 if (!writebuf
&& !readbuf
)
6441 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6444 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6445 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6450 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6457 ret
= write (fd
, writebuf
, (size_t) len
);
6459 ret
= read (fd
, readbuf
, (size_t) len
);
6465 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6466 struct target_loadseg
6468 /* Core address to which the segment is mapped. */
6470 /* VMA recorded in the program header. */
6472 /* Size of this segment in memory. */
6476 # if defined PT_GETDSBT
6477 struct target_loadmap
6479 /* Protocol version number, must be zero. */
6481 /* Pointer to the DSBT table, its size, and the DSBT index. */
6482 unsigned *dsbt_table
;
6483 unsigned dsbt_size
, dsbt_index
;
6484 /* Number of segments in this map. */
6486 /* The actual memory map. */
6487 struct target_loadseg segs
[/*nsegs*/];
6489 # define LINUX_LOADMAP PT_GETDSBT
6490 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6491 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6493 struct target_loadmap
6495 /* Protocol version number, must be zero. */
6497 /* Number of segments in this map. */
6499 /* The actual memory map. */
6500 struct target_loadseg segs
[/*nsegs*/];
6502 # define LINUX_LOADMAP PTRACE_GETFDPIC
6503 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6504 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6508 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6509 unsigned char *myaddr
, unsigned int len
)
6511 int pid
= lwpid_of (current_thread
);
6513 struct target_loadmap
*data
= NULL
;
6514 unsigned int actual_length
, copy_length
;
6516 if (strcmp (annex
, "exec") == 0)
6517 addr
= (int) LINUX_LOADMAP_EXEC
;
6518 else if (strcmp (annex
, "interp") == 0)
6519 addr
= (int) LINUX_LOADMAP_INTERP
;
6523 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6529 actual_length
= sizeof (struct target_loadmap
)
6530 + sizeof (struct target_loadseg
) * data
->nsegs
;
6532 if (offset
< 0 || offset
> actual_length
)
6535 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6536 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6540 # define linux_read_loadmap NULL
6541 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6544 linux_process_qsupported (char **features
, int count
)
6546 if (the_low_target
.process_qsupported
!= NULL
)
6547 the_low_target
.process_qsupported (features
, count
);
6551 linux_supports_catch_syscall (void)
6553 return (the_low_target
.get_syscall_trapinfo
!= NULL
6554 && linux_supports_tracesysgood ());
6558 linux_get_ipa_tdesc_idx (void)
6560 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6563 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6567 linux_supports_tracepoints (void)
6569 if (*the_low_target
.supports_tracepoints
== NULL
)
6572 return (*the_low_target
.supports_tracepoints
) ();
6576 linux_read_pc (struct regcache
*regcache
)
6578 if (the_low_target
.get_pc
== NULL
)
6581 return (*the_low_target
.get_pc
) (regcache
);
6585 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6587 gdb_assert (the_low_target
.set_pc
!= NULL
);
6589 (*the_low_target
.set_pc
) (regcache
, pc
);
6593 linux_thread_stopped (struct thread_info
*thread
)
6595 return get_thread_lwp (thread
)->stopped
;
6598 /* This exposes stop-all-threads functionality to other modules. */
6601 linux_pause_all (int freeze
)
6603 stop_all_lwps (freeze
, NULL
);
6606 /* This exposes unstop-all-threads functionality to other gdbserver
6610 linux_unpause_all (int unfreeze
)
6612 unstop_all_lwps (unfreeze
, NULL
);
6616 linux_prepare_to_access_memory (void)
6618 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6621 linux_pause_all (1);
6626 linux_done_accessing_memory (void)
6628 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6631 linux_unpause_all (1);
6635 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6636 CORE_ADDR collector
,
6639 CORE_ADDR
*jump_entry
,
6640 CORE_ADDR
*trampoline
,
6641 ULONGEST
*trampoline_size
,
6642 unsigned char *jjump_pad_insn
,
6643 ULONGEST
*jjump_pad_insn_size
,
6644 CORE_ADDR
*adjusted_insn_addr
,
6645 CORE_ADDR
*adjusted_insn_addr_end
,
6648 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6649 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6650 jump_entry
, trampoline
, trampoline_size
,
6651 jjump_pad_insn
, jjump_pad_insn_size
,
6652 adjusted_insn_addr
, adjusted_insn_addr_end
,
6656 static struct emit_ops
*
6657 linux_emit_ops (void)
6659 if (the_low_target
.emit_ops
!= NULL
)
6660 return (*the_low_target
.emit_ops
) ();
6666 linux_get_min_fast_tracepoint_insn_len (void)
6668 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6671 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6674 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6675 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6677 char filename
[PATH_MAX
];
6679 const int auxv_size
= is_elf64
6680 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6681 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6683 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6685 fd
= open (filename
, O_RDONLY
);
6691 while (read (fd
, buf
, auxv_size
) == auxv_size
6692 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6696 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6698 switch (aux
->a_type
)
6701 *phdr_memaddr
= aux
->a_un
.a_val
;
6704 *num_phdr
= aux
->a_un
.a_val
;
6710 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6712 switch (aux
->a_type
)
6715 *phdr_memaddr
= aux
->a_un
.a_val
;
6718 *num_phdr
= aux
->a_un
.a_val
;
6726 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6728 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6729 "phdr_memaddr = %ld, phdr_num = %d",
6730 (long) *phdr_memaddr
, *num_phdr
);
6737 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6740 get_dynamic (const int pid
, const int is_elf64
)
6742 CORE_ADDR phdr_memaddr
, relocation
;
6744 unsigned char *phdr_buf
;
6745 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6747 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6750 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6751 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6753 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6756 /* Compute relocation: it is expected to be 0 for "regular" executables,
6757 non-zero for PIE ones. */
6759 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6762 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6764 if (p
->p_type
== PT_PHDR
)
6765 relocation
= phdr_memaddr
- p
->p_vaddr
;
6769 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6771 if (p
->p_type
== PT_PHDR
)
6772 relocation
= phdr_memaddr
- p
->p_vaddr
;
6775 if (relocation
== -1)
6777 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6778 any real world executables, including PIE executables, have always
6779 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6780 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6781 or present DT_DEBUG anyway (fpc binaries are statically linked).
6783 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6785 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6790 for (i
= 0; i
< num_phdr
; i
++)
6794 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6796 if (p
->p_type
== PT_DYNAMIC
)
6797 return p
->p_vaddr
+ relocation
;
6801 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6803 if (p
->p_type
== PT_DYNAMIC
)
6804 return p
->p_vaddr
+ relocation
;
6811 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6812 can be 0 if the inferior does not yet have the library list initialized.
6813 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6814 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6817 get_r_debug (const int pid
, const int is_elf64
)
6819 CORE_ADDR dynamic_memaddr
;
6820 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6821 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6824 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6825 if (dynamic_memaddr
== 0)
6828 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6832 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6833 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6837 unsigned char buf
[sizeof (Elf64_Xword
)];
6841 #ifdef DT_MIPS_RLD_MAP
6842 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6844 if (linux_read_memory (dyn
->d_un
.d_val
,
6845 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6850 #endif /* DT_MIPS_RLD_MAP */
6851 #ifdef DT_MIPS_RLD_MAP_REL
6852 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6854 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6855 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6860 #endif /* DT_MIPS_RLD_MAP_REL */
6862 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6863 map
= dyn
->d_un
.d_val
;
6865 if (dyn
->d_tag
== DT_NULL
)
6870 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6871 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6875 unsigned char buf
[sizeof (Elf32_Word
)];
6879 #ifdef DT_MIPS_RLD_MAP
6880 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6882 if (linux_read_memory (dyn
->d_un
.d_val
,
6883 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6888 #endif /* DT_MIPS_RLD_MAP */
6889 #ifdef DT_MIPS_RLD_MAP_REL
6890 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6892 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6893 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6898 #endif /* DT_MIPS_RLD_MAP_REL */
6900 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6901 map
= dyn
->d_un
.d_val
;
6903 if (dyn
->d_tag
== DT_NULL
)
6907 dynamic_memaddr
+= dyn_size
;
6913 /* Read one pointer from MEMADDR in the inferior. */
6916 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6920 /* Go through a union so this works on either big or little endian
6921 hosts, when the inferior's pointer size is smaller than the size
6922 of CORE_ADDR. It is assumed the inferior's endianness is the
6923 same of the superior's. */
6926 CORE_ADDR core_addr
;
6931 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6934 if (ptr_size
== sizeof (CORE_ADDR
))
6935 *ptr
= addr
.core_addr
;
6936 else if (ptr_size
== sizeof (unsigned int))
6939 gdb_assert_not_reached ("unhandled pointer size");
6944 struct link_map_offsets
6946 /* Offset and size of r_debug.r_version. */
6947 int r_version_offset
;
6949 /* Offset and size of r_debug.r_map. */
6952 /* Offset to l_addr field in struct link_map. */
6955 /* Offset to l_name field in struct link_map. */
6958 /* Offset to l_ld field in struct link_map. */
6961 /* Offset to l_next field in struct link_map. */
6964 /* Offset to l_prev field in struct link_map. */
6968 /* Construct qXfer:libraries-svr4:read reply. */
6971 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
6972 unsigned const char *writebuf
,
6973 CORE_ADDR offset
, int len
)
6976 unsigned document_len
;
6977 struct process_info_private
*const priv
= current_process ()->priv
;
6978 char filename
[PATH_MAX
];
6981 static const struct link_map_offsets lmo_32bit_offsets
=
6983 0, /* r_version offset. */
6984 4, /* r_debug.r_map offset. */
6985 0, /* l_addr offset in link_map. */
6986 4, /* l_name offset in link_map. */
6987 8, /* l_ld offset in link_map. */
6988 12, /* l_next offset in link_map. */
6989 16 /* l_prev offset in link_map. */
6992 static const struct link_map_offsets lmo_64bit_offsets
=
6994 0, /* r_version offset. */
6995 8, /* r_debug.r_map offset. */
6996 0, /* l_addr offset in link_map. */
6997 8, /* l_name offset in link_map. */
6998 16, /* l_ld offset in link_map. */
6999 24, /* l_next offset in link_map. */
7000 32 /* l_prev offset in link_map. */
7002 const struct link_map_offsets
*lmo
;
7003 unsigned int machine
;
7005 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7006 int allocated
= 1024;
7008 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7009 int header_done
= 0;
7011 if (writebuf
!= NULL
)
7013 if (readbuf
== NULL
)
7016 pid
= lwpid_of (current_thread
);
7017 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7018 is_elf64
= elf_64_file_p (filename
, &machine
);
7019 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7020 ptr_size
= is_elf64
? 8 : 4;
7022 while (annex
[0] != '\0')
7028 sep
= strchr (annex
, '=');
7033 if (len
== 5 && startswith (annex
, "start"))
7035 else if (len
== 4 && startswith (annex
, "prev"))
7039 annex
= strchr (sep
, ';');
7046 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7053 if (priv
->r_debug
== 0)
7054 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7056 /* We failed to find DT_DEBUG. Such situation will not change
7057 for this inferior - do not retry it. Report it to GDB as
7058 E01, see for the reasons at the GDB solib-svr4.c side. */
7059 if (priv
->r_debug
== (CORE_ADDR
) -1)
7062 if (priv
->r_debug
!= 0)
7064 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7065 (unsigned char *) &r_version
,
7066 sizeof (r_version
)) != 0
7069 warning ("unexpected r_debug version %d", r_version
);
7071 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7072 &lm_addr
, ptr_size
) != 0)
7074 warning ("unable to read r_map from 0x%lx",
7075 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7080 document
= (char *) xmalloc (allocated
);
7081 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7082 p
= document
+ strlen (document
);
7085 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7086 &l_name
, ptr_size
) == 0
7087 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7088 &l_addr
, ptr_size
) == 0
7089 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7090 &l_ld
, ptr_size
) == 0
7091 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7092 &l_prev
, ptr_size
) == 0
7093 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7094 &l_next
, ptr_size
) == 0)
7096 unsigned char libname
[PATH_MAX
];
7098 if (lm_prev
!= l_prev
)
7100 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7101 (long) lm_prev
, (long) l_prev
);
7105 /* Ignore the first entry even if it has valid name as the first entry
7106 corresponds to the main executable. The first entry should not be
7107 skipped if the dynamic loader was loaded late by a static executable
7108 (see solib-svr4.c parameter ignore_first). But in such case the main
7109 executable does not have PT_DYNAMIC present and this function already
7110 exited above due to failed get_r_debug. */
7113 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7118 /* Not checking for error because reading may stop before
7119 we've got PATH_MAX worth of characters. */
7121 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7122 libname
[sizeof (libname
) - 1] = '\0';
7123 if (libname
[0] != '\0')
7125 /* 6x the size for xml_escape_text below. */
7126 size_t len
= 6 * strlen ((char *) libname
);
7131 /* Terminate `<library-list-svr4'. */
7136 while (allocated
< p
- document
+ len
+ 200)
7138 /* Expand to guarantee sufficient storage. */
7139 uintptr_t document_len
= p
- document
;
7141 document
= (char *) xrealloc (document
, 2 * allocated
);
7143 p
= document
+ document_len
;
7146 name
= xml_escape_text ((char *) libname
);
7147 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7148 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7149 name
, (unsigned long) lm_addr
,
7150 (unsigned long) l_addr
, (unsigned long) l_ld
);
7161 /* Empty list; terminate `<library-list-svr4'. */
7165 strcpy (p
, "</library-list-svr4>");
7167 document_len
= strlen (document
);
7168 if (offset
< document_len
)
7169 document_len
-= offset
;
7172 if (len
> document_len
)
7175 memcpy (readbuf
, document
+ offset
, len
);
7181 #ifdef HAVE_LINUX_BTRACE
7183 /* See to_disable_btrace target method. */
7186 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7188 enum btrace_error err
;
7190 err
= linux_disable_btrace (tinfo
);
7191 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7194 /* Encode an Intel Processor Trace configuration. */
7197 linux_low_encode_pt_config (struct buffer
*buffer
,
7198 const struct btrace_data_pt_config
*config
)
7200 buffer_grow_str (buffer
, "<pt-config>\n");
7202 switch (config
->cpu
.vendor
)
7205 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7206 "model=\"%u\" stepping=\"%u\"/>\n",
7207 config
->cpu
.family
, config
->cpu
.model
,
7208 config
->cpu
.stepping
);
7215 buffer_grow_str (buffer
, "</pt-config>\n");
7218 /* Encode a raw buffer. */
7221 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7227 /* We use hex encoding - see common/rsp-low.h. */
7228 buffer_grow_str (buffer
, "<raw>\n");
7234 elem
[0] = tohex ((*data
>> 4) & 0xf);
7235 elem
[1] = tohex (*data
++ & 0xf);
7237 buffer_grow (buffer
, elem
, 2);
7240 buffer_grow_str (buffer
, "</raw>\n");
7243 /* See to_read_btrace target method. */
7246 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7247 enum btrace_read_type type
)
7249 struct btrace_data btrace
;
7250 struct btrace_block
*block
;
7251 enum btrace_error err
;
7254 btrace_data_init (&btrace
);
7256 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7257 if (err
!= BTRACE_ERR_NONE
)
7259 if (err
== BTRACE_ERR_OVERFLOW
)
7260 buffer_grow_str0 (buffer
, "E.Overflow.");
7262 buffer_grow_str0 (buffer
, "E.Generic Error.");
7267 switch (btrace
.format
)
7269 case BTRACE_FORMAT_NONE
:
7270 buffer_grow_str0 (buffer
, "E.No Trace.");
7273 case BTRACE_FORMAT_BTS
:
7274 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7275 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7278 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7280 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7281 paddress (block
->begin
), paddress (block
->end
));
7283 buffer_grow_str0 (buffer
, "</btrace>\n");
7286 case BTRACE_FORMAT_PT
:
7287 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7288 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7289 buffer_grow_str (buffer
, "<pt>\n");
7291 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7293 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7294 btrace
.variant
.pt
.size
);
7296 buffer_grow_str (buffer
, "</pt>\n");
7297 buffer_grow_str0 (buffer
, "</btrace>\n");
7301 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7305 btrace_data_fini (&btrace
);
7309 btrace_data_fini (&btrace
);
7313 /* See to_btrace_conf target method. */
7316 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7317 struct buffer
*buffer
)
7319 const struct btrace_config
*conf
;
7321 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7322 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7324 conf
= linux_btrace_conf (tinfo
);
7327 switch (conf
->format
)
7329 case BTRACE_FORMAT_NONE
:
7332 case BTRACE_FORMAT_BTS
:
7333 buffer_xml_printf (buffer
, "<bts");
7334 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7335 buffer_xml_printf (buffer
, " />\n");
7338 case BTRACE_FORMAT_PT
:
7339 buffer_xml_printf (buffer
, "<pt");
7340 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7341 buffer_xml_printf (buffer
, "/>\n");
7346 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7349 #endif /* HAVE_LINUX_BTRACE */
7351 /* See nat/linux-nat.h. */
7354 current_lwp_ptid (void)
7356 return ptid_of (current_thread
);
7359 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7362 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7364 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7365 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7367 return default_breakpoint_kind_from_pc (pcptr
);
7370 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7372 static const gdb_byte
*
7373 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7375 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7377 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7380 /* Implementation of the target_ops method
7381 "breakpoint_kind_from_current_state". */
7384 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7386 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7387 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7389 return linux_breakpoint_kind_from_pc (pcptr
);
7392 /* Default implementation of linux_target_ops method "set_pc" for
7393 32-bit pc register which is literally named "pc". */
7396 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7398 uint32_t newpc
= pc
;
7400 supply_register_by_name (regcache
, "pc", &newpc
);
7403 /* Default implementation of linux_target_ops method "get_pc" for
7404 32-bit pc register which is literally named "pc". */
7407 linux_get_pc_32bit (struct regcache
*regcache
)
7411 collect_register_by_name (regcache
, "pc", &pc
);
7413 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7417 /* Default implementation of linux_target_ops method "set_pc" for
7418 64-bit pc register which is literally named "pc". */
7421 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7423 uint64_t newpc
= pc
;
7425 supply_register_by_name (regcache
, "pc", &newpc
);
7428 /* Default implementation of linux_target_ops method "get_pc" for
7429 64-bit pc register which is literally named "pc". */
7432 linux_get_pc_64bit (struct regcache
*regcache
)
7436 collect_register_by_name (regcache
, "pc", &pc
);
7438 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7443 static struct target_ops linux_target_ops
= {
7444 linux_create_inferior
,
7445 linux_post_create_inferior
,
7454 linux_fetch_registers
,
7455 linux_store_registers
,
7456 linux_prepare_to_access_memory
,
7457 linux_done_accessing_memory
,
7460 linux_look_up_symbols
,
7461 linux_request_interrupt
,
7463 linux_supports_z_point_type
,
7466 linux_stopped_by_sw_breakpoint
,
7467 linux_supports_stopped_by_sw_breakpoint
,
7468 linux_stopped_by_hw_breakpoint
,
7469 linux_supports_stopped_by_hw_breakpoint
,
7470 linux_supports_hardware_single_step
,
7471 linux_stopped_by_watchpoint
,
7472 linux_stopped_data_address
,
7473 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7474 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7475 && defined(PT_TEXT_END_ADDR)
7480 #ifdef USE_THREAD_DB
7481 thread_db_get_tls_address
,
7486 hostio_last_error_from_errno
,
7489 linux_supports_non_stop
,
7491 linux_start_non_stop
,
7492 linux_supports_multi_process
,
7493 linux_supports_fork_events
,
7494 linux_supports_vfork_events
,
7495 linux_supports_exec_events
,
7496 linux_handle_new_gdb_connection
,
7497 #ifdef USE_THREAD_DB
7498 thread_db_handle_monitor_command
,
7502 linux_common_core_of_thread
,
7504 linux_process_qsupported
,
7505 linux_supports_tracepoints
,
7508 linux_thread_stopped
,
7512 linux_stabilize_threads
,
7513 linux_install_fast_tracepoint_jump_pad
,
7515 linux_supports_disable_randomization
,
7516 linux_get_min_fast_tracepoint_insn_len
,
7517 linux_qxfer_libraries_svr4
,
7518 linux_supports_agent
,
7519 #ifdef HAVE_LINUX_BTRACE
7520 linux_supports_btrace
,
7521 linux_enable_btrace
,
7522 linux_low_disable_btrace
,
7523 linux_low_read_btrace
,
7524 linux_low_btrace_conf
,
7532 linux_supports_range_stepping
,
7533 linux_proc_pid_to_exec_file
,
7534 linux_mntns_open_cloexec
,
7536 linux_mntns_readlink
,
7537 linux_breakpoint_kind_from_pc
,
7538 linux_sw_breakpoint_from_kind
,
7539 linux_proc_tid_get_name
,
7540 linux_breakpoint_kind_from_current_state
,
7541 linux_supports_software_single_step
,
7542 linux_supports_catch_syscall
,
7543 linux_get_ipa_tdesc_idx
,
7546 #ifdef HAVE_LINUX_REGSETS
7548 initialize_regsets_info (struct regsets_info
*info
)
7550 for (info
->num_regsets
= 0;
7551 info
->regsets
[info
->num_regsets
].size
>= 0;
7552 info
->num_regsets
++)
7558 initialize_low (void)
7560 struct sigaction sigchld_action
;
7562 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7563 set_target_ops (&linux_target_ops
);
7565 linux_ptrace_init_warnings ();
7567 sigchld_action
.sa_handler
= sigchld_handler
;
7568 sigemptyset (&sigchld_action
.sa_mask
);
7569 sigchld_action
.sa_flags
= SA_RESTART
;
7570 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7572 initialize_low_arch ();
7574 linux_check_ptrace_features ();