1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2017 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "linux-low.h"
21 #include "nat/linux-osdata.h"
25 #include "signals-state-save-restore.h"
26 #include "nat/linux-nat.h"
27 #include "nat/linux-waitpid.h"
29 #include "nat/gdb_ptrace.h"
30 #include "nat/linux-ptrace.h"
31 #include "nat/linux-procfs.h"
32 #include "nat/linux-personality.h"
34 #include <sys/ioctl.h>
37 #include <sys/syscall.h>
41 #include <sys/types.h>
46 #include "filestuff.h"
47 #include "tracepoint.h"
50 #include "common-inferior.h"
51 #include "nat/fork-inferior.h"
54 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
55 then ELFMAG0 will have been defined. If it didn't get included by
56 gdb_proc_service.h then including it will likely introduce a duplicate
57 definition of elf_fpregset_t. */
60 #include "nat/linux-namespaces.h"
63 #define SPUFS_MAGIC 0x23c9b64e
66 #ifdef HAVE_PERSONALITY
67 # include <sys/personality.h>
68 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
69 # define ADDR_NO_RANDOMIZE 0x0040000
77 /* Some targets did not define these ptrace constants from the start,
78 so gdbserver defines them locally here. In the future, these may
79 be removed after they are added to asm/ptrace.h. */
80 #if !(defined(PT_TEXT_ADDR) \
81 || defined(PT_DATA_ADDR) \
82 || defined(PT_TEXT_END_ADDR))
83 #if defined(__mcoldfire__)
84 /* These are still undefined in 3.10 kernels. */
85 #define PT_TEXT_ADDR 49*4
86 #define PT_DATA_ADDR 50*4
87 #define PT_TEXT_END_ADDR 51*4
88 /* BFIN already defines these since at least 2.6.32 kernels. */
90 #define PT_TEXT_ADDR 220
91 #define PT_TEXT_END_ADDR 224
92 #define PT_DATA_ADDR 228
93 /* These are still undefined in 3.10 kernels. */
94 #elif defined(__TMS320C6X__)
95 #define PT_TEXT_ADDR (0x10000*4)
96 #define PT_DATA_ADDR (0x10004*4)
97 #define PT_TEXT_END_ADDR (0x10008*4)
101 #ifdef HAVE_LINUX_BTRACE
102 # include "nat/linux-btrace.h"
103 # include "btrace-common.h"
106 #ifndef HAVE_ELF32_AUXV_T
107 /* Copied from glibc's elf.h. */
110 uint32_t a_type
; /* Entry type */
113 uint32_t a_val
; /* Integer value */
114 /* We use to have pointer elements added here. We cannot do that,
115 though, since it does not work when using 32-bit definitions
116 on 64-bit platforms and vice versa. */
121 #ifndef HAVE_ELF64_AUXV_T
122 /* Copied from glibc's elf.h. */
125 uint64_t a_type
; /* Entry type */
128 uint64_t a_val
; /* Integer value */
129 /* We use to have pointer elements added here. We cannot do that,
130 though, since it does not work when using 32-bit definitions
131 on 64-bit platforms and vice versa. */
136 /* Does the current host support PTRACE_GETREGSET? */
137 int have_ptrace_getregset
= -1;
141 /* See nat/linux-nat.h. */
144 ptid_of_lwp (struct lwp_info
*lwp
)
146 return ptid_of (get_lwp_thread (lwp
));
149 /* See nat/linux-nat.h. */
152 lwp_set_arch_private_info (struct lwp_info
*lwp
,
153 struct arch_lwp_info
*info
)
155 lwp
->arch_private
= info
;
158 /* See nat/linux-nat.h. */
160 struct arch_lwp_info
*
161 lwp_arch_private_info (struct lwp_info
*lwp
)
163 return lwp
->arch_private
;
166 /* See nat/linux-nat.h. */
169 lwp_is_stopped (struct lwp_info
*lwp
)
174 /* See nat/linux-nat.h. */
176 enum target_stop_reason
177 lwp_stop_reason (struct lwp_info
*lwp
)
179 return lwp
->stop_reason
;
182 /* See nat/linux-nat.h. */
185 lwp_is_stepping (struct lwp_info
*lwp
)
187 return lwp
->stepping
;
190 /* A list of all unknown processes which receive stop signals. Some
191 other process will presumably claim each of these as forked
192 children momentarily. */
194 struct simple_pid_list
196 /* The process ID. */
199 /* The status as reported by waitpid. */
203 struct simple_pid_list
*next
;
205 struct simple_pid_list
*stopped_pids
;
207 /* Trivial list manipulation functions to keep track of a list of new
208 stopped processes. */
211 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
213 struct simple_pid_list
*new_pid
= XNEW (struct simple_pid_list
);
216 new_pid
->status
= status
;
217 new_pid
->next
= *listp
;
222 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
224 struct simple_pid_list
**p
;
226 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
227 if ((*p
)->pid
== pid
)
229 struct simple_pid_list
*next
= (*p
)->next
;
231 *statusp
= (*p
)->status
;
239 enum stopping_threads_kind
241 /* Not stopping threads presently. */
242 NOT_STOPPING_THREADS
,
244 /* Stopping threads. */
247 /* Stopping and suspending threads. */
248 STOPPING_AND_SUSPENDING_THREADS
251 /* This is set while stop_all_lwps is in effect. */
252 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
254 /* FIXME make into a target method? */
255 int using_threads
= 1;
257 /* True if we're presently stabilizing threads (moving them out of
259 static int stabilizing_threads
;
261 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
262 int step
, int signal
, siginfo_t
*info
);
263 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
264 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
265 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
266 static void unsuspend_all_lwps (struct lwp_info
*except
);
267 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
268 int *wstat
, int options
);
269 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
270 static struct lwp_info
*add_lwp (ptid_t ptid
);
271 static void linux_mourn (struct process_info
*process
);
272 static int linux_stopped_by_watchpoint (void);
273 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
274 static int lwp_is_marked_dead (struct lwp_info
*lwp
);
275 static void proceed_all_lwps (void);
276 static int finish_step_over (struct lwp_info
*lwp
);
277 static int kill_lwp (unsigned long lwpid
, int signo
);
278 static void enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
);
279 static void complete_ongoing_step_over (void);
280 static int linux_low_ptrace_options (int attached
);
281 static int check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
);
282 static int proceed_one_lwp (thread_info
*thread
, void *except
);
284 /* When the event-loop is doing a step-over, this points at the thread
286 ptid_t step_over_bkpt
;
288 /* True if the low target can hardware single-step. */
291 can_hardware_single_step (void)
293 if (the_low_target
.supports_hardware_single_step
!= NULL
)
294 return the_low_target
.supports_hardware_single_step ();
299 /* True if the low target can software single-step. Such targets
300 implement the GET_NEXT_PCS callback. */
303 can_software_single_step (void)
305 return (the_low_target
.get_next_pcs
!= NULL
);
308 /* True if the low target supports memory breakpoints. If so, we'll
309 have a GET_PC implementation. */
312 supports_breakpoints (void)
314 return (the_low_target
.get_pc
!= NULL
);
317 /* Returns true if this target can support fast tracepoints. This
318 does not mean that the in-process agent has been loaded in the
322 supports_fast_tracepoints (void)
324 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
327 /* True if LWP is stopped in its stepping range. */
330 lwp_in_step_range (struct lwp_info
*lwp
)
332 CORE_ADDR pc
= lwp
->stop_pc
;
334 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
337 struct pending_signals
341 struct pending_signals
*prev
;
344 /* The read/write ends of the pipe registered as waitable file in the
346 static int linux_event_pipe
[2] = { -1, -1 };
348 /* True if we're currently in async mode. */
349 #define target_is_async_p() (linux_event_pipe[0] != -1)
351 static void send_sigstop (struct lwp_info
*lwp
);
352 static void wait_for_sigstop (void);
354 /* Return non-zero if HEADER is a 64-bit ELF file. */
357 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
359 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
360 && header
->e_ident
[EI_MAG1
] == ELFMAG1
361 && header
->e_ident
[EI_MAG2
] == ELFMAG2
362 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
364 *machine
= header
->e_machine
;
365 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
372 /* Return non-zero if FILE is a 64-bit ELF file,
373 zero if the file is not a 64-bit ELF file,
374 and -1 if the file is not accessible or doesn't exist. */
377 elf_64_file_p (const char *file
, unsigned int *machine
)
382 fd
= open (file
, O_RDONLY
);
386 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
393 return elf_64_header_p (&header
, machine
);
396 /* Accepts an integer PID; Returns true if the executable PID is
397 running is a 64-bit ELF file.. */
400 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
404 sprintf (file
, "/proc/%d/exe", pid
);
405 return elf_64_file_p (file
, machine
);
409 delete_lwp (struct lwp_info
*lwp
)
411 struct thread_info
*thr
= get_lwp_thread (lwp
);
414 debug_printf ("deleting %ld\n", lwpid_of (thr
));
418 if (the_low_target
.delete_thread
!= NULL
)
419 the_low_target
.delete_thread (lwp
->arch_private
);
421 gdb_assert (lwp
->arch_private
== NULL
);
426 /* Add a process to the common process list, and set its private
429 static struct process_info
*
430 linux_add_process (int pid
, int attached
)
432 struct process_info
*proc
;
434 proc
= add_process (pid
, attached
);
435 proc
->priv
= XCNEW (struct process_info_private
);
437 if (the_low_target
.new_process
!= NULL
)
438 proc
->priv
->arch_private
= the_low_target
.new_process ();
443 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
445 /* Call the target arch_setup function on the current thread. */
448 linux_arch_setup (void)
450 the_low_target
.arch_setup ();
453 /* Call the target arch_setup function on THREAD. */
456 linux_arch_setup_thread (struct thread_info
*thread
)
458 struct thread_info
*saved_thread
;
460 saved_thread
= current_thread
;
461 current_thread
= thread
;
465 current_thread
= saved_thread
;
468 /* Handle a GNU/Linux extended wait response. If we see a clone,
469 fork, or vfork event, we need to add the new LWP to our list
470 (and return 0 so as not to report the trap to higher layers).
471 If we see an exec event, we will modify ORIG_EVENT_LWP to point
472 to a new LWP representing the new program. */
475 handle_extended_wait (struct lwp_info
**orig_event_lwp
, int wstat
)
477 struct lwp_info
*event_lwp
= *orig_event_lwp
;
478 int event
= linux_ptrace_get_extended_event (wstat
);
479 struct thread_info
*event_thr
= get_lwp_thread (event_lwp
);
480 struct lwp_info
*new_lwp
;
482 gdb_assert (event_lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
484 /* All extended events we currently use are mid-syscall. Only
485 PTRACE_EVENT_STOP is delivered more like a signal-stop, but
486 you have to be using PTRACE_SEIZE to get that. */
487 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
489 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
490 || (event
== PTRACE_EVENT_CLONE
))
493 unsigned long new_pid
;
496 /* Get the pid of the new lwp. */
497 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
500 /* If we haven't already seen the new PID stop, wait for it now. */
501 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
503 /* The new child has a pending SIGSTOP. We can't affect it until it
504 hits the SIGSTOP, but we're already attached. */
506 ret
= my_waitpid (new_pid
, &status
, __WALL
);
509 perror_with_name ("waiting for new child");
510 else if (ret
!= new_pid
)
511 warning ("wait returned unexpected PID %d", ret
);
512 else if (!WIFSTOPPED (status
))
513 warning ("wait returned unexpected status 0x%x", status
);
516 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
518 struct process_info
*parent_proc
;
519 struct process_info
*child_proc
;
520 struct lwp_info
*child_lwp
;
521 struct thread_info
*child_thr
;
522 struct target_desc
*tdesc
;
524 ptid
= ptid_build (new_pid
, new_pid
, 0);
528 debug_printf ("HEW: Got fork event from LWP %ld, "
530 ptid_get_lwp (ptid_of (event_thr
)),
531 ptid_get_pid (ptid
));
534 /* Add the new process to the tables and clone the breakpoint
535 lists of the parent. We need to do this even if the new process
536 will be detached, since we will need the process object and the
537 breakpoints to remove any breakpoints from memory when we
538 detach, and the client side will access registers. */
539 child_proc
= linux_add_process (new_pid
, 0);
540 gdb_assert (child_proc
!= NULL
);
541 child_lwp
= add_lwp (ptid
);
542 gdb_assert (child_lwp
!= NULL
);
543 child_lwp
->stopped
= 1;
544 child_lwp
->must_set_ptrace_flags
= 1;
545 child_lwp
->status_pending_p
= 0;
546 child_thr
= get_lwp_thread (child_lwp
);
547 child_thr
->last_resume_kind
= resume_stop
;
548 child_thr
->last_status
.kind
= TARGET_WAITKIND_STOPPED
;
550 /* If we're suspending all threads, leave this one suspended
551 too. If the fork/clone parent is stepping over a breakpoint,
552 all other threads have been suspended already. Leave the
553 child suspended too. */
554 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
555 || event_lwp
->bp_reinsert
!= 0)
558 debug_printf ("HEW: leaving child suspended\n");
559 child_lwp
->suspended
= 1;
562 parent_proc
= get_thread_process (event_thr
);
563 child_proc
->attached
= parent_proc
->attached
;
565 if (event_lwp
->bp_reinsert
!= 0
566 && can_software_single_step ()
567 && event
== PTRACE_EVENT_VFORK
)
569 /* If we leave single-step breakpoints there, child will
570 hit it, so uninsert single-step breakpoints from parent
571 (and child). Once vfork child is done, reinsert
572 them back to parent. */
573 uninsert_single_step_breakpoints (event_thr
);
576 clone_all_breakpoints (child_thr
, event_thr
);
578 tdesc
= allocate_target_description ();
579 copy_target_description (tdesc
, parent_proc
->tdesc
);
580 child_proc
->tdesc
= tdesc
;
582 /* Clone arch-specific process data. */
583 if (the_low_target
.new_fork
!= NULL
)
584 the_low_target
.new_fork (parent_proc
, child_proc
);
586 /* Save fork info in the parent thread. */
587 if (event
== PTRACE_EVENT_FORK
)
588 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
589 else if (event
== PTRACE_EVENT_VFORK
)
590 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
592 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
594 /* The status_pending field contains bits denoting the
595 extended event, so when the pending event is handled,
596 the handler will look at lwp->waitstatus. */
597 event_lwp
->status_pending_p
= 1;
598 event_lwp
->status_pending
= wstat
;
600 /* Link the threads until the parent event is passed on to
602 event_lwp
->fork_relative
= child_lwp
;
603 child_lwp
->fork_relative
= event_lwp
;
605 /* If the parent thread is doing step-over with single-step
606 breakpoints, the list of single-step breakpoints are cloned
607 from the parent's. Remove them from the child process.
608 In case of vfork, we'll reinsert them back once vforked
610 if (event_lwp
->bp_reinsert
!= 0
611 && can_software_single_step ())
613 /* The child process is forked and stopped, so it is safe
614 to access its memory without stopping all other threads
615 from other processes. */
616 delete_single_step_breakpoints (child_thr
);
618 gdb_assert (has_single_step_breakpoints (event_thr
));
619 gdb_assert (!has_single_step_breakpoints (child_thr
));
622 /* Report the event. */
627 debug_printf ("HEW: Got clone event "
628 "from LWP %ld, new child is LWP %ld\n",
629 lwpid_of (event_thr
), new_pid
);
631 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
632 new_lwp
= add_lwp (ptid
);
634 /* Either we're going to immediately resume the new thread
635 or leave it stopped. linux_resume_one_lwp is a nop if it
636 thinks the thread is currently running, so set this first
637 before calling linux_resume_one_lwp. */
638 new_lwp
->stopped
= 1;
640 /* If we're suspending all threads, leave this one suspended
641 too. If the fork/clone parent is stepping over a breakpoint,
642 all other threads have been suspended already. Leave the
643 child suspended too. */
644 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
645 || event_lwp
->bp_reinsert
!= 0)
646 new_lwp
->suspended
= 1;
648 /* Normally we will get the pending SIGSTOP. But in some cases
649 we might get another signal delivered to the group first.
650 If we do get another signal, be sure not to lose it. */
651 if (WSTOPSIG (status
) != SIGSTOP
)
653 new_lwp
->stop_expected
= 1;
654 new_lwp
->status_pending_p
= 1;
655 new_lwp
->status_pending
= status
;
657 else if (report_thread_events
)
659 new_lwp
->waitstatus
.kind
= TARGET_WAITKIND_THREAD_CREATED
;
660 new_lwp
->status_pending_p
= 1;
661 new_lwp
->status_pending
= status
;
664 thread_db_notice_clone (event_thr
, ptid
);
666 /* Don't report the event. */
669 else if (event
== PTRACE_EVENT_VFORK_DONE
)
671 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
673 if (event_lwp
->bp_reinsert
!= 0 && can_software_single_step ())
675 reinsert_single_step_breakpoints (event_thr
);
677 gdb_assert (has_single_step_breakpoints (event_thr
));
680 /* Report the event. */
683 else if (event
== PTRACE_EVENT_EXEC
&& report_exec_events
)
685 struct process_info
*proc
;
686 VEC (int) *syscalls_to_catch
;
692 debug_printf ("HEW: Got exec event from LWP %ld\n",
693 lwpid_of (event_thr
));
696 /* Get the event ptid. */
697 event_ptid
= ptid_of (event_thr
);
698 event_pid
= ptid_get_pid (event_ptid
);
700 /* Save the syscall list from the execing process. */
701 proc
= get_thread_process (event_thr
);
702 syscalls_to_catch
= proc
->syscalls_to_catch
;
703 proc
->syscalls_to_catch
= NULL
;
705 /* Delete the execing process and all its threads. */
707 current_thread
= NULL
;
709 /* Create a new process/lwp/thread. */
710 proc
= linux_add_process (event_pid
, 0);
711 event_lwp
= add_lwp (event_ptid
);
712 event_thr
= get_lwp_thread (event_lwp
);
713 gdb_assert (current_thread
== event_thr
);
714 linux_arch_setup_thread (event_thr
);
716 /* Set the event status. */
717 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
718 event_lwp
->waitstatus
.value
.execd_pathname
719 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
721 /* Mark the exec status as pending. */
722 event_lwp
->stopped
= 1;
723 event_lwp
->status_pending_p
= 1;
724 event_lwp
->status_pending
= wstat
;
725 event_thr
->last_resume_kind
= resume_continue
;
726 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
728 /* Update syscall state in the new lwp, effectively mid-syscall too. */
729 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
731 /* Restore the list to catch. Don't rely on the client, which is free
732 to avoid sending a new list when the architecture doesn't change.
733 Also, for ANY_SYSCALL, the architecture doesn't really matter. */
734 proc
->syscalls_to_catch
= syscalls_to_catch
;
736 /* Report the event. */
737 *orig_event_lwp
= event_lwp
;
741 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
744 /* Return the PC as read from the regcache of LWP, without any
748 get_pc (struct lwp_info
*lwp
)
750 struct thread_info
*saved_thread
;
751 struct regcache
*regcache
;
754 if (the_low_target
.get_pc
== NULL
)
757 saved_thread
= current_thread
;
758 current_thread
= get_lwp_thread (lwp
);
760 regcache
= get_thread_regcache (current_thread
, 1);
761 pc
= (*the_low_target
.get_pc
) (regcache
);
764 debug_printf ("pc is 0x%lx\n", (long) pc
);
766 current_thread
= saved_thread
;
770 /* This function should only be called if LWP got a SYSCALL_SIGTRAP.
771 Fill *SYSNO with the syscall nr trapped. */
774 get_syscall_trapinfo (struct lwp_info
*lwp
, int *sysno
)
776 struct thread_info
*saved_thread
;
777 struct regcache
*regcache
;
779 if (the_low_target
.get_syscall_trapinfo
== NULL
)
781 /* If we cannot get the syscall trapinfo, report an unknown
782 system call number. */
783 *sysno
= UNKNOWN_SYSCALL
;
787 saved_thread
= current_thread
;
788 current_thread
= get_lwp_thread (lwp
);
790 regcache
= get_thread_regcache (current_thread
, 1);
791 (*the_low_target
.get_syscall_trapinfo
) (regcache
, sysno
);
794 debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno
);
796 current_thread
= saved_thread
;
799 static int check_stopped_by_watchpoint (struct lwp_info
*child
);
801 /* Called when the LWP stopped for a signal/trap. If it stopped for a
802 trap check what caused it (breakpoint, watchpoint, trace, etc.),
803 and save the result in the LWP's stop_reason field. If it stopped
804 for a breakpoint, decrement the PC if necessary on the lwp's
805 architecture. Returns true if we now have the LWP's stop PC. */
808 save_stop_reason (struct lwp_info
*lwp
)
811 CORE_ADDR sw_breakpoint_pc
;
812 struct thread_info
*saved_thread
;
813 #if USE_SIGTRAP_SIGINFO
817 if (the_low_target
.get_pc
== NULL
)
821 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
823 /* breakpoint_at reads from the current thread. */
824 saved_thread
= current_thread
;
825 current_thread
= get_lwp_thread (lwp
);
827 #if USE_SIGTRAP_SIGINFO
828 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
829 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
831 if (siginfo
.si_signo
== SIGTRAP
)
833 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
)
834 && GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
836 /* The si_code is ambiguous on this arch -- check debug
838 if (!check_stopped_by_watchpoint (lwp
))
839 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
841 else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
843 /* If we determine the LWP stopped for a SW breakpoint,
844 trust it. Particularly don't check watchpoint
845 registers, because at least on s390, we'd find
846 stopped-by-watchpoint as long as there's a watchpoint
848 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
850 else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
852 /* This can indicate either a hardware breakpoint or
853 hardware watchpoint. Check debug registers. */
854 if (!check_stopped_by_watchpoint (lwp
))
855 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
857 else if (siginfo
.si_code
== TRAP_TRACE
)
859 /* We may have single stepped an instruction that
860 triggered a watchpoint. In that case, on some
861 architectures (such as x86), instead of TRAP_HWBKPT,
862 si_code indicates TRAP_TRACE, and we need to check
863 the debug registers separately. */
864 if (!check_stopped_by_watchpoint (lwp
))
865 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
870 /* We may have just stepped a breakpoint instruction. E.g., in
871 non-stop mode, GDB first tells the thread A to step a range, and
872 then the user inserts a breakpoint inside the range. In that
873 case we need to report the breakpoint PC. */
874 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
875 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
876 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
878 if (hardware_breakpoint_inserted_here (pc
))
879 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
881 if (lwp
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
)
882 check_stopped_by_watchpoint (lwp
);
885 if (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
889 struct thread_info
*thr
= get_lwp_thread (lwp
);
891 debug_printf ("CSBB: %s stopped by software breakpoint\n",
892 target_pid_to_str (ptid_of (thr
)));
895 /* Back up the PC if necessary. */
896 if (pc
!= sw_breakpoint_pc
)
898 struct regcache
*regcache
899 = get_thread_regcache (current_thread
, 1);
900 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
903 /* Update this so we record the correct stop PC below. */
904 pc
= sw_breakpoint_pc
;
906 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
)
910 struct thread_info
*thr
= get_lwp_thread (lwp
);
912 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
913 target_pid_to_str (ptid_of (thr
)));
916 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
920 struct thread_info
*thr
= get_lwp_thread (lwp
);
922 debug_printf ("CSBB: %s stopped by hardware watchpoint\n",
923 target_pid_to_str (ptid_of (thr
)));
926 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
)
930 struct thread_info
*thr
= get_lwp_thread (lwp
);
932 debug_printf ("CSBB: %s stopped by trace\n",
933 target_pid_to_str (ptid_of (thr
)));
938 current_thread
= saved_thread
;
942 static struct lwp_info
*
943 add_lwp (ptid_t ptid
)
945 struct lwp_info
*lwp
;
947 lwp
= XCNEW (struct lwp_info
);
949 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
951 if (the_low_target
.new_thread
!= NULL
)
952 the_low_target
.new_thread (lwp
);
954 lwp
->thread
= add_thread (ptid
, lwp
);
959 /* Callback to be used when calling fork_inferior, responsible for
960 actually initiating the tracing of the inferior. */
965 if (ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0,
966 (PTRACE_TYPE_ARG4
) 0) < 0)
967 trace_start_error_with_name ("ptrace");
969 if (setpgid (0, 0) < 0)
970 trace_start_error_with_name ("setpgid");
972 /* If GDBserver is connected to gdb via stdio, redirect the inferior's
973 stdout to stderr so that inferior i/o doesn't corrupt the connection.
974 Also, redirect stdin to /dev/null. */
975 if (remote_connection_is_stdio ())
978 trace_start_error_with_name ("close");
979 if (open ("/dev/null", O_RDONLY
) < 0)
980 trace_start_error_with_name ("open");
982 trace_start_error_with_name ("dup2");
983 if (write (2, "stdin/stdout redirected\n",
984 sizeof ("stdin/stdout redirected\n") - 1) < 0)
986 /* Errors ignored. */;
991 /* Start an inferior process and returns its pid.
992 PROGRAM is the name of the program to be started, and PROGRAM_ARGS
993 are its arguments. */
996 linux_create_inferior (const char *program
,
997 const std::vector
<char *> &program_args
)
999 struct lwp_info
*new_lwp
;
1002 struct cleanup
*restore_personality
1003 = maybe_disable_address_space_randomization (disable_randomization
);
1004 std::string str_program_args
= stringify_argv (program_args
);
1006 pid
= fork_inferior (program
,
1007 str_program_args
.c_str (),
1008 get_environ ()->envp (), linux_ptrace_fun
,
1009 NULL
, NULL
, NULL
, NULL
);
1011 do_cleanups (restore_personality
);
1013 linux_add_process (pid
, 0);
1015 ptid
= ptid_build (pid
, pid
, 0);
1016 new_lwp
= add_lwp (ptid
);
1017 new_lwp
->must_set_ptrace_flags
= 1;
1019 post_fork_inferior (pid
, program
);
1024 /* Implement the post_create_inferior target_ops method. */
1027 linux_post_create_inferior (void)
1029 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
1031 linux_arch_setup ();
1033 if (lwp
->must_set_ptrace_flags
)
1035 struct process_info
*proc
= current_process ();
1036 int options
= linux_low_ptrace_options (proc
->attached
);
1038 linux_enable_event_reporting (lwpid_of (current_thread
), options
);
1039 lwp
->must_set_ptrace_flags
= 0;
1043 /* Attach to an inferior process. Returns 0 on success, ERRNO on
1047 linux_attach_lwp (ptid_t ptid
)
1049 struct lwp_info
*new_lwp
;
1050 int lwpid
= ptid_get_lwp (ptid
);
1052 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
1056 new_lwp
= add_lwp (ptid
);
1058 /* We need to wait for SIGSTOP before being able to make the next
1059 ptrace call on this LWP. */
1060 new_lwp
->must_set_ptrace_flags
= 1;
1062 if (linux_proc_pid_is_stopped (lwpid
))
1065 debug_printf ("Attached to a stopped process\n");
1067 /* The process is definitely stopped. It is in a job control
1068 stop, unless the kernel predates the TASK_STOPPED /
1069 TASK_TRACED distinction, in which case it might be in a
1070 ptrace stop. Make sure it is in a ptrace stop; from there we
1071 can kill it, signal it, et cetera.
1073 First make sure there is a pending SIGSTOP. Since we are
1074 already attached, the process can not transition from stopped
1075 to running without a PTRACE_CONT; so we know this signal will
1076 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1077 probably already in the queue (unless this kernel is old
1078 enough to use TASK_STOPPED for ptrace stops); but since
1079 SIGSTOP is not an RT signal, it can only be queued once. */
1080 kill_lwp (lwpid
, SIGSTOP
);
1082 /* Finally, resume the stopped process. This will deliver the
1083 SIGSTOP (or a higher priority signal, just like normal
1084 PTRACE_ATTACH), which we'll catch later on. */
1085 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1088 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
1089 brings it to a halt.
1091 There are several cases to consider here:
1093 1) gdbserver has already attached to the process and is being notified
1094 of a new thread that is being created.
1095 In this case we should ignore that SIGSTOP and resume the
1096 process. This is handled below by setting stop_expected = 1,
1097 and the fact that add_thread sets last_resume_kind ==
1100 2) This is the first thread (the process thread), and we're attaching
1101 to it via attach_inferior.
1102 In this case we want the process thread to stop.
1103 This is handled by having linux_attach set last_resume_kind ==
1104 resume_stop after we return.
1106 If the pid we are attaching to is also the tgid, we attach to and
1107 stop all the existing threads. Otherwise, we attach to pid and
1108 ignore any other threads in the same group as this pid.
1110 3) GDB is connecting to gdbserver and is requesting an enumeration of all
1112 In this case we want the thread to stop.
1113 FIXME: This case is currently not properly handled.
1114 We should wait for the SIGSTOP but don't. Things work apparently
1115 because enough time passes between when we ptrace (ATTACH) and when
1116 gdb makes the next ptrace call on the thread.
1118 On the other hand, if we are currently trying to stop all threads, we
1119 should treat the new thread as if we had sent it a SIGSTOP. This works
1120 because we are guaranteed that the add_lwp call above added us to the
1121 end of the list, and so the new thread has not yet reached
1122 wait_for_sigstop (but will). */
1123 new_lwp
->stop_expected
= 1;
1128 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
1129 already attached. Returns true if a new LWP is found, false
1133 attach_proc_task_lwp_callback (ptid_t ptid
)
1135 /* Is this a new thread? */
1136 if (find_thread_ptid (ptid
) == NULL
)
1138 int lwpid
= ptid_get_lwp (ptid
);
1142 debug_printf ("Found new lwp %d\n", lwpid
);
1144 err
= linux_attach_lwp (ptid
);
1146 /* Be quiet if we simply raced with the thread exiting. EPERM
1147 is returned if the thread's task still exists, and is marked
1148 as exited or zombie, as well as other conditions, so in that
1149 case, confirm the status in /proc/PID/status. */
1151 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1155 debug_printf ("Cannot attach to lwp %d: "
1156 "thread is gone (%d: %s)\n",
1157 lwpid
, err
, strerror (err
));
1162 warning (_("Cannot attach to lwp %d: %s"),
1164 linux_ptrace_attach_fail_reason_string (ptid
, err
));
1172 static void async_file_mark (void);
1174 /* Attach to PID. If PID is the tgid, attach to it and all
1178 linux_attach (unsigned long pid
)
1180 struct process_info
*proc
;
1181 struct thread_info
*initial_thread
;
1182 ptid_t ptid
= ptid_build (pid
, pid
, 0);
1185 /* Attach to PID. We will check for other threads
1187 err
= linux_attach_lwp (ptid
);
1189 error ("Cannot attach to process %ld: %s",
1190 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
1192 proc
= linux_add_process (pid
, 1);
1194 /* Don't ignore the initial SIGSTOP if we just attached to this
1195 process. It will be collected by wait shortly. */
1196 initial_thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
1197 initial_thread
->last_resume_kind
= resume_stop
;
1199 /* We must attach to every LWP. If /proc is mounted, use that to
1200 find them now. On the one hand, the inferior may be using raw
1201 clone instead of using pthreads. On the other hand, even if it
1202 is using pthreads, GDB may not be connected yet (thread_db needs
1203 to do symbol lookups, through qSymbol). Also, thread_db walks
1204 structures in the inferior's address space to find the list of
1205 threads/LWPs, and those structures may well be corrupted. Note
1206 that once thread_db is loaded, we'll still use it to list threads
1207 and associate pthread info with each LWP. */
1208 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1210 /* GDB will shortly read the xml target description for this
1211 process, to figure out the process' architecture. But the target
1212 description is only filled in when the first process/thread in
1213 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1214 that now, otherwise, if GDB is fast enough, it could read the
1215 target description _before_ that initial stop. */
1218 struct lwp_info
*lwp
;
1220 ptid_t pid_ptid
= pid_to_ptid (pid
);
1222 lwpid
= linux_wait_for_event_filtered (pid_ptid
, pid_ptid
,
1224 gdb_assert (lwpid
> 0);
1226 lwp
= find_lwp_pid (pid_to_ptid (lwpid
));
1228 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGSTOP
)
1230 lwp
->status_pending_p
= 1;
1231 lwp
->status_pending
= wstat
;
1234 initial_thread
->last_resume_kind
= resume_continue
;
1238 gdb_assert (proc
->tdesc
!= NULL
);
1251 second_thread_of_pid_p (thread_info
*thread
, void *args
)
1253 struct counter
*counter
= (struct counter
*) args
;
1255 if (thread
->id
.pid () == counter
->pid
)
1257 if (++counter
->count
> 1)
1265 last_thread_of_process_p (int pid
)
1267 struct counter counter
= { pid
, 0 };
1269 return (find_inferior (&all_threads
,
1270 second_thread_of_pid_p
, &counter
) == NULL
);
1276 linux_kill_one_lwp (struct lwp_info
*lwp
)
1278 struct thread_info
*thr
= get_lwp_thread (lwp
);
1279 int pid
= lwpid_of (thr
);
1281 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1282 there is no signal context, and ptrace(PTRACE_KILL) (or
1283 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1284 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1285 alternative is to kill with SIGKILL. We only need one SIGKILL
1286 per process, not one for each thread. But since we still support
1287 support debugging programs using raw clone without CLONE_THREAD,
1288 we send one for each thread. For years, we used PTRACE_KILL
1289 only, so we're being a bit paranoid about some old kernels where
1290 PTRACE_KILL might work better (dubious if there are any such, but
1291 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1292 second, and so we're fine everywhere. */
1295 kill_lwp (pid
, SIGKILL
);
1298 int save_errno
= errno
;
1300 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1301 target_pid_to_str (ptid_of (thr
)),
1302 save_errno
? strerror (save_errno
) : "OK");
1306 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1309 int save_errno
= errno
;
1311 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1312 target_pid_to_str (ptid_of (thr
)),
1313 save_errno
? strerror (save_errno
) : "OK");
1317 /* Kill LWP and wait for it to die. */
1320 kill_wait_lwp (struct lwp_info
*lwp
)
1322 struct thread_info
*thr
= get_lwp_thread (lwp
);
1323 int pid
= ptid_get_pid (ptid_of (thr
));
1324 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1329 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1333 linux_kill_one_lwp (lwp
);
1335 /* Make sure it died. Notes:
1337 - The loop is most likely unnecessary.
1339 - We don't use linux_wait_for_event as that could delete lwps
1340 while we're iterating over them. We're not interested in
1341 any pending status at this point, only in making sure all
1342 wait status on the kernel side are collected until the
1345 - We don't use __WALL here as the __WALL emulation relies on
1346 SIGCHLD, and killing a stopped process doesn't generate
1347 one, nor an exit status.
1349 res
= my_waitpid (lwpid
, &wstat
, 0);
1350 if (res
== -1 && errno
== ECHILD
)
1351 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1352 } while (res
> 0 && WIFSTOPPED (wstat
));
1354 /* Even if it was stopped, the child may have already disappeared.
1355 E.g., if it was killed by SIGKILL. */
1356 if (res
< 0 && errno
!= ECHILD
)
1357 perror_with_name ("kill_wait_lwp");
1360 /* Callback for `find_inferior'. Kills an lwp of a given process,
1361 except the leader. */
1364 kill_one_lwp_callback (thread_info
*thread
, void *args
)
1366 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1367 int pid
= * (int *) args
;
1369 if (thread
->id
.pid () != pid
)
1372 /* We avoid killing the first thread here, because of a Linux kernel (at
1373 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1374 the children get a chance to be reaped, it will remain a zombie
1377 if (lwpid_of (thread
) == pid
)
1380 debug_printf ("lkop: is last of process %s\n",
1381 target_pid_to_str (thread
->id
));
1385 kill_wait_lwp (lwp
);
1390 linux_kill (int pid
)
1392 struct process_info
*process
;
1393 struct lwp_info
*lwp
;
1395 process
= find_process_pid (pid
);
1396 if (process
== NULL
)
1399 /* If we're killing a running inferior, make sure it is stopped
1400 first, as PTRACE_KILL will not work otherwise. */
1401 stop_all_lwps (0, NULL
);
1403 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1405 /* See the comment in linux_kill_one_lwp. We did not kill the first
1406 thread in the list, so do so now. */
1407 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1412 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1416 kill_wait_lwp (lwp
);
1418 the_target
->mourn (process
);
1420 /* Since we presently can only stop all lwps of all processes, we
1421 need to unstop lwps of other processes. */
1422 unstop_all_lwps (0, NULL
);
1426 /* Get pending signal of THREAD, for detaching purposes. This is the
1427 signal the thread last stopped for, which we need to deliver to the
1428 thread when detaching, otherwise, it'd be suppressed/lost. */
1431 get_detach_signal (struct thread_info
*thread
)
1433 enum gdb_signal signo
= GDB_SIGNAL_0
;
1435 struct lwp_info
*lp
= get_thread_lwp (thread
);
1437 if (lp
->status_pending_p
)
1438 status
= lp
->status_pending
;
1441 /* If the thread had been suspended by gdbserver, and it stopped
1442 cleanly, then it'll have stopped with SIGSTOP. But we don't
1443 want to deliver that SIGSTOP. */
1444 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1445 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1448 /* Otherwise, we may need to deliver the signal we
1450 status
= lp
->last_status
;
1453 if (!WIFSTOPPED (status
))
1456 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1457 target_pid_to_str (ptid_of (thread
)));
1461 /* Extended wait statuses aren't real SIGTRAPs. */
1462 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1465 debug_printf ("GPS: lwp %s had stopped with extended "
1466 "status: no pending signal\n",
1467 target_pid_to_str (ptid_of (thread
)));
1471 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1473 if (program_signals_p
&& !program_signals
[signo
])
1476 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1477 target_pid_to_str (ptid_of (thread
)),
1478 gdb_signal_to_string (signo
));
1481 else if (!program_signals_p
1482 /* If we have no way to know which signals GDB does not
1483 want to have passed to the program, assume
1484 SIGTRAP/SIGINT, which is GDB's default. */
1485 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1488 debug_printf ("GPS: lwp %s had signal %s, "
1489 "but we don't know if we should pass it. "
1490 "Default to not.\n",
1491 target_pid_to_str (ptid_of (thread
)),
1492 gdb_signal_to_string (signo
));
1498 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1499 target_pid_to_str (ptid_of (thread
)),
1500 gdb_signal_to_string (signo
));
1502 return WSTOPSIG (status
);
1506 /* Detach from LWP. */
1509 linux_detach_one_lwp (struct lwp_info
*lwp
)
1511 struct thread_info
*thread
= get_lwp_thread (lwp
);
1515 /* If there is a pending SIGSTOP, get rid of it. */
1516 if (lwp
->stop_expected
)
1519 debug_printf ("Sending SIGCONT to %s\n",
1520 target_pid_to_str (ptid_of (thread
)));
1522 kill_lwp (lwpid_of (thread
), SIGCONT
);
1523 lwp
->stop_expected
= 0;
1526 /* Pass on any pending signal for this thread. */
1527 sig
= get_detach_signal (thread
);
1529 /* Preparing to resume may try to write registers, and fail if the
1530 lwp is zombie. If that happens, ignore the error. We'll handle
1531 it below, when detach fails with ESRCH. */
1534 /* Flush any pending changes to the process's registers. */
1535 regcache_invalidate_thread (thread
);
1537 /* Finally, let it resume. */
1538 if (the_low_target
.prepare_to_resume
!= NULL
)
1539 the_low_target
.prepare_to_resume (lwp
);
1541 CATCH (ex
, RETURN_MASK_ERROR
)
1543 if (!check_ptrace_stopped_lwp_gone (lwp
))
1544 throw_exception (ex
);
1548 lwpid
= lwpid_of (thread
);
1549 if (ptrace (PTRACE_DETACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0,
1550 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1552 int save_errno
= errno
;
1554 /* We know the thread exists, so ESRCH must mean the lwp is
1555 zombie. This can happen if one of the already-detached
1556 threads exits the whole thread group. In that case we're
1557 still attached, and must reap the lwp. */
1558 if (save_errno
== ESRCH
)
1562 ret
= my_waitpid (lwpid
, &status
, __WALL
);
1565 warning (_("Couldn't reap LWP %d while detaching: %s"),
1566 lwpid
, strerror (errno
));
1568 else if (!WIFEXITED (status
) && !WIFSIGNALED (status
))
1570 warning (_("Reaping LWP %d while detaching "
1571 "returned unexpected status 0x%x"),
1577 error (_("Can't detach %s: %s"),
1578 target_pid_to_str (ptid_of (thread
)),
1579 strerror (save_errno
));
1582 else if (debug_threads
)
1584 debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n",
1585 target_pid_to_str (ptid_of (thread
)),
1592 /* Callback for find_inferior. Detaches from non-leader threads of a
1596 linux_detach_lwp_callback (thread_info
*thread
, void *args
)
1598 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1599 int pid
= *(int *) args
;
1600 int lwpid
= lwpid_of (thread
);
1602 /* Skip other processes. */
1603 if (thread
->id
.pid () != pid
)
1606 /* We don't actually detach from the thread group leader just yet.
1607 If the thread group exits, we must reap the zombie clone lwps
1608 before we're able to reap the leader. */
1609 if (thread
->id
.pid () == lwpid
)
1612 linux_detach_one_lwp (lwp
);
1617 linux_detach (int pid
)
1619 struct process_info
*process
;
1620 struct lwp_info
*main_lwp
;
1622 process
= find_process_pid (pid
);
1623 if (process
== NULL
)
1626 /* As there's a step over already in progress, let it finish first,
1627 otherwise nesting a stabilize_threads operation on top gets real
1629 complete_ongoing_step_over ();
1631 /* Stop all threads before detaching. First, ptrace requires that
1632 the thread is stopped to sucessfully detach. Second, thread_db
1633 may need to uninstall thread event breakpoints from memory, which
1634 only works with a stopped process anyway. */
1635 stop_all_lwps (0, NULL
);
1637 #ifdef USE_THREAD_DB
1638 thread_db_detach (process
);
1641 /* Stabilize threads (move out of jump pads). */
1642 stabilize_threads ();
1644 /* Detach from the clone lwps first. If the thread group exits just
1645 while we're detaching, we must reap the clone lwps before we're
1646 able to reap the leader. */
1647 find_inferior (&all_threads
, linux_detach_lwp_callback
, &pid
);
1649 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1650 linux_detach_one_lwp (main_lwp
);
1652 the_target
->mourn (process
);
1654 /* Since we presently can only stop all lwps of all processes, we
1655 need to unstop lwps of other processes. */
1656 unstop_all_lwps (0, NULL
);
1660 /* Remove all LWPs that belong to process PROC from the lwp list. */
1663 delete_lwp_callback (thread_info
*thread
, void *proc
)
1665 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1666 struct process_info
*process
= (struct process_info
*) proc
;
1668 if (pid_of (thread
) == pid_of (process
))
1675 linux_mourn (struct process_info
*process
)
1677 struct process_info_private
*priv
;
1679 #ifdef USE_THREAD_DB
1680 thread_db_mourn (process
);
1683 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1685 /* Freeing all private data. */
1686 priv
= process
->priv
;
1687 if (the_low_target
.delete_process
!= NULL
)
1688 the_low_target
.delete_process (priv
->arch_private
);
1690 gdb_assert (priv
->arch_private
== NULL
);
1692 process
->priv
= NULL
;
1694 remove_process (process
);
1698 linux_join (int pid
)
1703 ret
= my_waitpid (pid
, &status
, 0);
1704 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1706 } while (ret
!= -1 || errno
!= ECHILD
);
1709 /* Return nonzero if the given thread is still alive. */
1711 linux_thread_alive (ptid_t ptid
)
1713 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1715 /* We assume we always know if a thread exits. If a whole process
1716 exited but we still haven't been able to report it to GDB, we'll
1717 hold on to the last lwp of the dead process. */
1719 return !lwp_is_marked_dead (lwp
);
1724 /* Return 1 if this lwp still has an interesting status pending. If
1725 not (e.g., it had stopped for a breakpoint that is gone), return
1729 thread_still_has_status_pending_p (struct thread_info
*thread
)
1731 struct lwp_info
*lp
= get_thread_lwp (thread
);
1733 if (!lp
->status_pending_p
)
1736 if (thread
->last_resume_kind
!= resume_stop
1737 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1738 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1740 struct thread_info
*saved_thread
;
1744 gdb_assert (lp
->last_status
!= 0);
1748 saved_thread
= current_thread
;
1749 current_thread
= thread
;
1751 if (pc
!= lp
->stop_pc
)
1754 debug_printf ("PC of %ld changed\n",
1759 #if !USE_SIGTRAP_SIGINFO
1760 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1761 && !(*the_low_target
.breakpoint_at
) (pc
))
1764 debug_printf ("previous SW breakpoint of %ld gone\n",
1768 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1769 && !hardware_breakpoint_inserted_here (pc
))
1772 debug_printf ("previous HW breakpoint of %ld gone\n",
1778 current_thread
= saved_thread
;
1783 debug_printf ("discarding pending breakpoint status\n");
1784 lp
->status_pending_p
= 0;
1792 /* Returns true if LWP is resumed from the client's perspective. */
1795 lwp_resumed (struct lwp_info
*lwp
)
1797 struct thread_info
*thread
= get_lwp_thread (lwp
);
1799 if (thread
->last_resume_kind
!= resume_stop
)
1802 /* Did gdb send us a `vCont;t', but we haven't reported the
1803 corresponding stop to gdb yet? If so, the thread is still
1804 resumed/running from gdb's perspective. */
1805 if (thread
->last_resume_kind
== resume_stop
1806 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1812 /* Return 1 if this lwp has an interesting status pending. */
1814 status_pending_p_callback (thread_info
*thread
, void *arg
)
1816 struct lwp_info
*lp
= get_thread_lwp (thread
);
1817 ptid_t ptid
= * (ptid_t
*) arg
;
1819 /* Check if we're only interested in events from a specific process
1820 or a specific LWP. */
1821 if (!ptid_match (ptid_of (thread
), ptid
))
1824 if (!lwp_resumed (lp
))
1827 if (lp
->status_pending_p
1828 && !thread_still_has_status_pending_p (thread
))
1830 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1834 return lp
->status_pending_p
;
1838 same_lwp (thread_info
*thread
, void *data
)
1840 ptid_t ptid
= *(ptid_t
*) data
;
1843 if (ptid_get_lwp (ptid
) != 0)
1844 lwp
= ptid_get_lwp (ptid
);
1846 lwp
= ptid_get_pid (ptid
);
1848 if (thread
->id
.lwp () == lwp
)
1855 find_lwp_pid (ptid_t ptid
)
1857 thread_info
*thread
= find_inferior (&all_threads
, same_lwp
, &ptid
);
1862 return get_thread_lwp (thread
);
1865 /* Return the number of known LWPs in the tgid given by PID. */
1872 for_each_thread (pid
, [&] (thread_info
*thread
)
1880 /* The arguments passed to iterate_over_lwps. */
1882 struct iterate_over_lwps_args
1884 /* The FILTER argument passed to iterate_over_lwps. */
1887 /* The CALLBACK argument passed to iterate_over_lwps. */
1888 iterate_over_lwps_ftype
*callback
;
1890 /* The DATA argument passed to iterate_over_lwps. */
1894 /* Callback for find_inferior used by iterate_over_lwps to filter
1895 calls to the callback supplied to that function. Returning a
1896 nonzero value causes find_inferiors to stop iterating and return
1897 the current inferior_list_entry. Returning zero indicates that
1898 find_inferiors should continue iterating. */
1901 iterate_over_lwps_filter (thread_info
*thread
, void *args_p
)
1903 struct iterate_over_lwps_args
*args
1904 = (struct iterate_over_lwps_args
*) args_p
;
1906 if (thread
->id
.matches (args
->filter
))
1908 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1910 return (*args
->callback
) (lwp
, args
->data
);
1916 /* See nat/linux-nat.h. */
1919 iterate_over_lwps (ptid_t filter
,
1920 iterate_over_lwps_ftype callback
,
1923 struct iterate_over_lwps_args args
= {filter
, callback
, data
};
1925 thread_info
*thread
= find_inferior (&all_threads
, iterate_over_lwps_filter
,
1930 return get_thread_lwp (thread
);
1933 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1934 their exits until all other threads in the group have exited. */
1937 check_zombie_leaders (void)
1939 for_each_process ([] (process_info
*proc
) {
1940 pid_t leader_pid
= pid_of (proc
);
1941 struct lwp_info
*leader_lp
;
1943 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1946 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1947 "num_lwps=%d, zombie=%d\n",
1948 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1949 linux_proc_pid_is_zombie (leader_pid
));
1951 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1952 /* Check if there are other threads in the group, as we may
1953 have raced with the inferior simply exiting. */
1954 && !last_thread_of_process_p (leader_pid
)
1955 && linux_proc_pid_is_zombie (leader_pid
))
1957 /* A leader zombie can mean one of two things:
1959 - It exited, and there's an exit status pending
1960 available, or only the leader exited (not the whole
1961 program). In the latter case, we can't waitpid the
1962 leader's exit status until all other threads are gone.
1964 - There are 3 or more threads in the group, and a thread
1965 other than the leader exec'd. On an exec, the Linux
1966 kernel destroys all other threads (except the execing
1967 one) in the thread group, and resets the execing thread's
1968 tid to the tgid. No exit notification is sent for the
1969 execing thread -- from the ptracer's perspective, it
1970 appears as though the execing thread just vanishes.
1971 Until we reap all other threads except the leader and the
1972 execing thread, the leader will be zombie, and the
1973 execing thread will be in `D (disc sleep)'. As soon as
1974 all other threads are reaped, the execing thread changes
1975 it's tid to the tgid, and the previous (zombie) leader
1976 vanishes, giving place to the "new" leader. We could try
1977 distinguishing the exit and exec cases, by waiting once
1978 more, and seeing if something comes out, but it doesn't
1979 sound useful. The previous leader _does_ go away, and
1980 we'll re-add the new one once we see the exec event
1981 (which is just the same as what would happen if the
1982 previous leader did exit voluntarily before some other
1986 debug_printf ("CZL: Thread group leader %d zombie "
1987 "(it exited, or another thread execd).\n",
1990 delete_lwp (leader_lp
);
1995 /* Callback for `find_inferior'. Returns the first LWP that is not
1996 stopped. ARG is a PTID filter. */
1999 not_stopped_callback (thread_info
*thread
, void *arg
)
2001 struct lwp_info
*lwp
;
2002 ptid_t filter
= *(ptid_t
*) arg
;
2004 if (!ptid_match (ptid_of (thread
), filter
))
2007 lwp
= get_thread_lwp (thread
);
2014 /* Increment LWP's suspend count. */
2017 lwp_suspended_inc (struct lwp_info
*lwp
)
2021 if (debug_threads
&& lwp
->suspended
> 4)
2023 struct thread_info
*thread
= get_lwp_thread (lwp
);
2025 debug_printf ("LWP %ld has a suspiciously high suspend count,"
2026 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
2030 /* Decrement LWP's suspend count. */
2033 lwp_suspended_decr (struct lwp_info
*lwp
)
2037 if (lwp
->suspended
< 0)
2039 struct thread_info
*thread
= get_lwp_thread (lwp
);
2041 internal_error (__FILE__
, __LINE__
,
2042 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
2047 /* This function should only be called if the LWP got a SIGTRAP.
2049 Handle any tracepoint steps or hits. Return true if a tracepoint
2050 event was handled, 0 otherwise. */
2053 handle_tracepoints (struct lwp_info
*lwp
)
2055 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
2056 int tpoint_related_event
= 0;
2058 gdb_assert (lwp
->suspended
== 0);
2060 /* If this tracepoint hit causes a tracing stop, we'll immediately
2061 uninsert tracepoints. To do this, we temporarily pause all
2062 threads, unpatch away, and then unpause threads. We need to make
2063 sure the unpausing doesn't resume LWP too. */
2064 lwp_suspended_inc (lwp
);
2066 /* And we need to be sure that any all-threads-stopping doesn't try
2067 to move threads out of the jump pads, as it could deadlock the
2068 inferior (LWP could be in the jump pad, maybe even holding the
2071 /* Do any necessary step collect actions. */
2072 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2074 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2076 /* See if we just hit a tracepoint and do its main collect
2078 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2080 lwp_suspended_decr (lwp
);
2082 gdb_assert (lwp
->suspended
== 0);
2083 gdb_assert (!stabilizing_threads
2084 || (lwp
->collecting_fast_tracepoint
2085 != fast_tpoint_collect_result::not_collecting
));
2087 if (tpoint_related_event
)
2090 debug_printf ("got a tracepoint event\n");
2097 /* Convenience wrapper. Returns information about LWP's fast tracepoint
2098 collection status. */
2100 static fast_tpoint_collect_result
2101 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2102 struct fast_tpoint_collect_status
*status
)
2104 CORE_ADDR thread_area
;
2105 struct thread_info
*thread
= get_lwp_thread (lwp
);
2107 if (the_low_target
.get_thread_area
== NULL
)
2108 return fast_tpoint_collect_result::not_collecting
;
2110 /* Get the thread area address. This is used to recognize which
2111 thread is which when tracing with the in-process agent library.
2112 We don't read anything from the address, and treat it as opaque;
2113 it's the address itself that we assume is unique per-thread. */
2114 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2115 return fast_tpoint_collect_result::not_collecting
;
2117 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2120 /* The reason we resume in the caller, is because we want to be able
2121 to pass lwp->status_pending as WSTAT, and we need to clear
2122 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2123 refuses to resume. */
2126 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2128 struct thread_info
*saved_thread
;
2130 saved_thread
= current_thread
;
2131 current_thread
= get_lwp_thread (lwp
);
2134 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2135 && supports_fast_tracepoints ()
2136 && agent_loaded_p ())
2138 struct fast_tpoint_collect_status status
;
2141 debug_printf ("Checking whether LWP %ld needs to move out of the "
2143 lwpid_of (current_thread
));
2145 fast_tpoint_collect_result r
2146 = linux_fast_tracepoint_collecting (lwp
, &status
);
2149 || (WSTOPSIG (*wstat
) != SIGILL
2150 && WSTOPSIG (*wstat
) != SIGFPE
2151 && WSTOPSIG (*wstat
) != SIGSEGV
2152 && WSTOPSIG (*wstat
) != SIGBUS
))
2154 lwp
->collecting_fast_tracepoint
= r
;
2156 if (r
!= fast_tpoint_collect_result::not_collecting
)
2158 if (r
== fast_tpoint_collect_result::before_insn
2159 && lwp
->exit_jump_pad_bkpt
== NULL
)
2161 /* Haven't executed the original instruction yet.
2162 Set breakpoint there, and wait till it's hit,
2163 then single-step until exiting the jump pad. */
2164 lwp
->exit_jump_pad_bkpt
2165 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2169 debug_printf ("Checking whether LWP %ld needs to move out of "
2170 "the jump pad...it does\n",
2171 lwpid_of (current_thread
));
2172 current_thread
= saved_thread
;
2179 /* If we get a synchronous signal while collecting, *and*
2180 while executing the (relocated) original instruction,
2181 reset the PC to point at the tpoint address, before
2182 reporting to GDB. Otherwise, it's an IPA lib bug: just
2183 report the signal to GDB, and pray for the best. */
2185 lwp
->collecting_fast_tracepoint
2186 = fast_tpoint_collect_result::not_collecting
;
2188 if (r
!= fast_tpoint_collect_result::not_collecting
2189 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2190 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2193 struct regcache
*regcache
;
2195 /* The si_addr on a few signals references the address
2196 of the faulting instruction. Adjust that as
2198 if ((WSTOPSIG (*wstat
) == SIGILL
2199 || WSTOPSIG (*wstat
) == SIGFPE
2200 || WSTOPSIG (*wstat
) == SIGBUS
2201 || WSTOPSIG (*wstat
) == SIGSEGV
)
2202 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2203 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2204 /* Final check just to make sure we don't clobber
2205 the siginfo of non-kernel-sent signals. */
2206 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2208 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2209 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2210 (PTRACE_TYPE_ARG3
) 0, &info
);
2213 regcache
= get_thread_regcache (current_thread
, 1);
2214 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2215 lwp
->stop_pc
= status
.tpoint_addr
;
2217 /* Cancel any fast tracepoint lock this thread was
2219 force_unlock_trace_buffer ();
2222 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2225 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2226 "stopping all threads momentarily.\n");
2228 stop_all_lwps (1, lwp
);
2230 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2231 lwp
->exit_jump_pad_bkpt
= NULL
;
2233 unstop_all_lwps (1, lwp
);
2235 gdb_assert (lwp
->suspended
>= 0);
2241 debug_printf ("Checking whether LWP %ld needs to move out of the "
2243 lwpid_of (current_thread
));
2245 current_thread
= saved_thread
;
2249 /* Enqueue one signal in the "signals to report later when out of the
2253 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2255 struct pending_signals
*p_sig
;
2256 struct thread_info
*thread
= get_lwp_thread (lwp
);
2259 debug_printf ("Deferring signal %d for LWP %ld.\n",
2260 WSTOPSIG (*wstat
), lwpid_of (thread
));
2264 struct pending_signals
*sig
;
2266 for (sig
= lwp
->pending_signals_to_report
;
2269 debug_printf (" Already queued %d\n",
2272 debug_printf (" (no more currently queued signals)\n");
2275 /* Don't enqueue non-RT signals if they are already in the deferred
2276 queue. (SIGSTOP being the easiest signal to see ending up here
2278 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2280 struct pending_signals
*sig
;
2282 for (sig
= lwp
->pending_signals_to_report
;
2286 if (sig
->signal
== WSTOPSIG (*wstat
))
2289 debug_printf ("Not requeuing already queued non-RT signal %d"
2298 p_sig
= XCNEW (struct pending_signals
);
2299 p_sig
->prev
= lwp
->pending_signals_to_report
;
2300 p_sig
->signal
= WSTOPSIG (*wstat
);
2302 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2305 lwp
->pending_signals_to_report
= p_sig
;
2308 /* Dequeue one signal from the "signals to report later when out of
2309 the jump pad" list. */
2312 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2314 struct thread_info
*thread
= get_lwp_thread (lwp
);
2316 if (lwp
->pending_signals_to_report
!= NULL
)
2318 struct pending_signals
**p_sig
;
2320 p_sig
= &lwp
->pending_signals_to_report
;
2321 while ((*p_sig
)->prev
!= NULL
)
2322 p_sig
= &(*p_sig
)->prev
;
2324 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2325 if ((*p_sig
)->info
.si_signo
!= 0)
2326 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2332 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2333 WSTOPSIG (*wstat
), lwpid_of (thread
));
2337 struct pending_signals
*sig
;
2339 for (sig
= lwp
->pending_signals_to_report
;
2342 debug_printf (" Still queued %d\n",
2345 debug_printf (" (no more queued signals)\n");
2354 /* Fetch the possibly triggered data watchpoint info and store it in
2357 On some archs, like x86, that use debug registers to set
2358 watchpoints, it's possible that the way to know which watched
2359 address trapped, is to check the register that is used to select
2360 which address to watch. Problem is, between setting the watchpoint
2361 and reading back which data address trapped, the user may change
2362 the set of watchpoints, and, as a consequence, GDB changes the
2363 debug registers in the inferior. To avoid reading back a stale
2364 stopped-data-address when that happens, we cache in LP the fact
2365 that a watchpoint trapped, and the corresponding data address, as
2366 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2367 registers meanwhile, we have the cached data we can rely on. */
2370 check_stopped_by_watchpoint (struct lwp_info
*child
)
2372 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2374 struct thread_info
*saved_thread
;
2376 saved_thread
= current_thread
;
2377 current_thread
= get_lwp_thread (child
);
2379 if (the_low_target
.stopped_by_watchpoint ())
2381 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2383 if (the_low_target
.stopped_data_address
!= NULL
)
2384 child
->stopped_data_address
2385 = the_low_target
.stopped_data_address ();
2387 child
->stopped_data_address
= 0;
2390 current_thread
= saved_thread
;
2393 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2396 /* Return the ptrace options that we want to try to enable. */
2399 linux_low_ptrace_options (int attached
)
2404 options
|= PTRACE_O_EXITKILL
;
2406 if (report_fork_events
)
2407 options
|= PTRACE_O_TRACEFORK
;
2409 if (report_vfork_events
)
2410 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2412 if (report_exec_events
)
2413 options
|= PTRACE_O_TRACEEXEC
;
2415 options
|= PTRACE_O_TRACESYSGOOD
;
2420 /* Do low-level handling of the event, and check if we should go on
2421 and pass it to caller code. Return the affected lwp if we are, or
2424 static struct lwp_info
*
2425 linux_low_filter_event (int lwpid
, int wstat
)
2427 struct lwp_info
*child
;
2428 struct thread_info
*thread
;
2429 int have_stop_pc
= 0;
2431 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2433 /* Check for stop events reported by a process we didn't already
2434 know about - anything not already in our LWP list.
2436 If we're expecting to receive stopped processes after
2437 fork, vfork, and clone events, then we'll just add the
2438 new one to our list and go back to waiting for the event
2439 to be reported - the stopped process might be returned
2440 from waitpid before or after the event is.
2442 But note the case of a non-leader thread exec'ing after the
2443 leader having exited, and gone from our lists (because
2444 check_zombie_leaders deleted it). The non-leader thread
2445 changes its tid to the tgid. */
2447 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2448 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2452 /* A multi-thread exec after we had seen the leader exiting. */
2455 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2456 "after exec.\n", lwpid
);
2459 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2460 child
= add_lwp (child_ptid
);
2462 current_thread
= child
->thread
;
2465 /* If we didn't find a process, one of two things presumably happened:
2466 - A process we started and then detached from has exited. Ignore it.
2467 - A process we are controlling has forked and the new child's stop
2468 was reported to us by the kernel. Save its PID. */
2469 if (child
== NULL
&& WIFSTOPPED (wstat
))
2471 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2474 else if (child
== NULL
)
2477 thread
= get_lwp_thread (child
);
2481 child
->last_status
= wstat
;
2483 /* Check if the thread has exited. */
2484 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2487 debug_printf ("LLFE: %d exited.\n", lwpid
);
2489 if (finish_step_over (child
))
2491 /* Unsuspend all other LWPs, and set them back running again. */
2492 unsuspend_all_lwps (child
);
2495 /* If there is at least one more LWP, then the exit signal was
2496 not the end of the debugged application and should be
2497 ignored, unless GDB wants to hear about thread exits. */
2498 if (report_thread_events
2499 || last_thread_of_process_p (pid_of (thread
)))
2501 /* Since events are serialized to GDB core, and we can't
2502 report this one right now. Leave the status pending for
2503 the next time we're able to report it. */
2504 mark_lwp_dead (child
, wstat
);
2514 gdb_assert (WIFSTOPPED (wstat
));
2516 if (WIFSTOPPED (wstat
))
2518 struct process_info
*proc
;
2520 /* Architecture-specific setup after inferior is running. */
2521 proc
= find_process_pid (pid_of (thread
));
2522 if (proc
->tdesc
== NULL
)
2526 /* This needs to happen after we have attached to the
2527 inferior and it is stopped for the first time, but
2528 before we access any inferior registers. */
2529 linux_arch_setup_thread (thread
);
2533 /* The process is started, but GDBserver will do
2534 architecture-specific setup after the program stops at
2535 the first instruction. */
2536 child
->status_pending_p
= 1;
2537 child
->status_pending
= wstat
;
2543 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2545 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2546 int options
= linux_low_ptrace_options (proc
->attached
);
2548 linux_enable_event_reporting (lwpid
, options
);
2549 child
->must_set_ptrace_flags
= 0;
2552 /* Always update syscall_state, even if it will be filtered later. */
2553 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2555 child
->syscall_state
2556 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2557 ? TARGET_WAITKIND_SYSCALL_RETURN
2558 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2562 /* Almost all other ptrace-stops are known to be outside of system
2563 calls, with further exceptions in handle_extended_wait. */
2564 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2567 /* Be careful to not overwrite stop_pc until save_stop_reason is
2569 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2570 && linux_is_extended_waitstatus (wstat
))
2572 child
->stop_pc
= get_pc (child
);
2573 if (handle_extended_wait (&child
, wstat
))
2575 /* The event has been handled, so just return without
2581 if (linux_wstatus_maybe_breakpoint (wstat
))
2583 if (save_stop_reason (child
))
2588 child
->stop_pc
= get_pc (child
);
2590 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2591 && child
->stop_expected
)
2594 debug_printf ("Expected stop.\n");
2595 child
->stop_expected
= 0;
2597 if (thread
->last_resume_kind
== resume_stop
)
2599 /* We want to report the stop to the core. Treat the
2600 SIGSTOP as a normal event. */
2602 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2603 target_pid_to_str (ptid_of (thread
)));
2605 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2607 /* Stopping threads. We don't want this SIGSTOP to end up
2610 debug_printf ("LLW: SIGSTOP caught for %s "
2611 "while stopping threads.\n",
2612 target_pid_to_str (ptid_of (thread
)));
2617 /* This is a delayed SIGSTOP. Filter out the event. */
2619 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2620 child
->stepping
? "step" : "continue",
2621 target_pid_to_str (ptid_of (thread
)));
2623 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2628 child
->status_pending_p
= 1;
2629 child
->status_pending
= wstat
;
2633 /* Return true if THREAD is doing hardware single step. */
2636 maybe_hw_step (struct thread_info
*thread
)
2638 if (can_hardware_single_step ())
2642 /* GDBserver must insert single-step breakpoint for software
2644 gdb_assert (has_single_step_breakpoints (thread
));
2649 /* Resume LWPs that are currently stopped without any pending status
2650 to report, but are resumed from the core's perspective. */
2653 resume_stopped_resumed_lwps (thread_info
*thread
)
2655 struct lwp_info
*lp
= get_thread_lwp (thread
);
2659 && !lp
->status_pending_p
2660 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2664 if (thread
->last_resume_kind
== resume_step
)
2665 step
= maybe_hw_step (thread
);
2668 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2669 target_pid_to_str (ptid_of (thread
)),
2670 paddress (lp
->stop_pc
),
2673 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2677 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2678 match FILTER_PTID (leaving others pending). The PTIDs can be:
2679 minus_one_ptid, to specify any child; a pid PTID, specifying all
2680 lwps of a thread group; or a PTID representing a single lwp. Store
2681 the stop status through the status pointer WSTAT. OPTIONS is
2682 passed to the waitpid call. Return 0 if no event was found and
2683 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2684 was found. Return the PID of the stopped child otherwise. */
2687 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2688 int *wstatp
, int options
)
2690 struct thread_info
*event_thread
;
2691 struct lwp_info
*event_child
, *requested_child
;
2692 sigset_t block_mask
, prev_mask
;
2695 /* N.B. event_thread points to the thread_info struct that contains
2696 event_child. Keep them in sync. */
2697 event_thread
= NULL
;
2699 requested_child
= NULL
;
2701 /* Check for a lwp with a pending status. */
2703 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2705 event_thread
= (struct thread_info
*)
2706 find_inferior_in_random (&all_threads
, status_pending_p_callback
,
2708 if (event_thread
!= NULL
)
2709 event_child
= get_thread_lwp (event_thread
);
2710 if (debug_threads
&& event_thread
)
2711 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2713 else if (!ptid_equal (filter_ptid
, null_ptid
))
2715 requested_child
= find_lwp_pid (filter_ptid
);
2717 if (stopping_threads
== NOT_STOPPING_THREADS
2718 && requested_child
->status_pending_p
2719 && (requested_child
->collecting_fast_tracepoint
2720 != fast_tpoint_collect_result::not_collecting
))
2722 enqueue_one_deferred_signal (requested_child
,
2723 &requested_child
->status_pending
);
2724 requested_child
->status_pending_p
= 0;
2725 requested_child
->status_pending
= 0;
2726 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2729 if (requested_child
->suspended
2730 && requested_child
->status_pending_p
)
2732 internal_error (__FILE__
, __LINE__
,
2733 "requesting an event out of a"
2734 " suspended child?");
2737 if (requested_child
->status_pending_p
)
2739 event_child
= requested_child
;
2740 event_thread
= get_lwp_thread (event_child
);
2744 if (event_child
!= NULL
)
2747 debug_printf ("Got an event from pending child %ld (%04x)\n",
2748 lwpid_of (event_thread
), event_child
->status_pending
);
2749 *wstatp
= event_child
->status_pending
;
2750 event_child
->status_pending_p
= 0;
2751 event_child
->status_pending
= 0;
2752 current_thread
= event_thread
;
2753 return lwpid_of (event_thread
);
2756 /* But if we don't find a pending event, we'll have to wait.
2758 We only enter this loop if no process has a pending wait status.
2759 Thus any action taken in response to a wait status inside this
2760 loop is responding as soon as we detect the status, not after any
2763 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2764 all signals while here. */
2765 sigfillset (&block_mask
);
2766 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2768 /* Always pull all events out of the kernel. We'll randomly select
2769 an event LWP out of all that have events, to prevent
2771 while (event_child
== NULL
)
2775 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2778 - If the thread group leader exits while other threads in the
2779 thread group still exist, waitpid(TGID, ...) hangs. That
2780 waitpid won't return an exit status until the other threads
2781 in the group are reaped.
2783 - When a non-leader thread execs, that thread just vanishes
2784 without reporting an exit (so we'd hang if we waited for it
2785 explicitly in that case). The exec event is reported to
2788 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2791 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2792 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2798 debug_printf ("LLW: waitpid %ld received %s\n",
2799 (long) ret
, status_to_str (*wstatp
));
2802 /* Filter all events. IOW, leave all events pending. We'll
2803 randomly select an event LWP out of all that have events
2805 linux_low_filter_event (ret
, *wstatp
);
2806 /* Retry until nothing comes out of waitpid. A single
2807 SIGCHLD can indicate more than one child stopped. */
2811 /* Now that we've pulled all events out of the kernel, resume
2812 LWPs that don't have an interesting event to report. */
2813 if (stopping_threads
== NOT_STOPPING_THREADS
)
2814 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2816 /* ... and find an LWP with a status to report to the core, if
2818 event_thread
= (struct thread_info
*)
2819 find_inferior_in_random (&all_threads
, status_pending_p_callback
,
2821 if (event_thread
!= NULL
)
2823 event_child
= get_thread_lwp (event_thread
);
2824 *wstatp
= event_child
->status_pending
;
2825 event_child
->status_pending_p
= 0;
2826 event_child
->status_pending
= 0;
2830 /* Check for zombie thread group leaders. Those can't be reaped
2831 until all other threads in the thread group are. */
2832 check_zombie_leaders ();
2834 /* If there are no resumed children left in the set of LWPs we
2835 want to wait for, bail. We can't just block in
2836 waitpid/sigsuspend, because lwps might have been left stopped
2837 in trace-stop state, and we'd be stuck forever waiting for
2838 their status to change (which would only happen if we resumed
2839 them). Even if WNOHANG is set, this return code is preferred
2840 over 0 (below), as it is more detailed. */
2841 if ((find_inferior (&all_threads
,
2842 not_stopped_callback
,
2843 &wait_ptid
) == NULL
))
2846 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2847 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2851 /* No interesting event to report to the caller. */
2852 if ((options
& WNOHANG
))
2855 debug_printf ("WNOHANG set, no event found\n");
2857 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2861 /* Block until we get an event reported with SIGCHLD. */
2863 debug_printf ("sigsuspend'ing\n");
2865 sigsuspend (&prev_mask
);
2866 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2870 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2872 current_thread
= event_thread
;
2874 return lwpid_of (event_thread
);
2877 /* Wait for an event from child(ren) PTID. PTIDs can be:
2878 minus_one_ptid, to specify any child; a pid PTID, specifying all
2879 lwps of a thread group; or a PTID representing a single lwp. Store
2880 the stop status through the status pointer WSTAT. OPTIONS is
2881 passed to the waitpid call. Return 0 if no event was found and
2882 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2883 was found. Return the PID of the stopped child otherwise. */
2886 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2888 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2891 /* Count the LWP's that have had events. */
2894 count_events_callback (thread_info
*thread
, void *data
)
2896 struct lwp_info
*lp
= get_thread_lwp (thread
);
2897 int *count
= (int *) data
;
2899 gdb_assert (count
!= NULL
);
2901 /* Count only resumed LWPs that have an event pending. */
2902 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2903 && lp
->status_pending_p
)
2909 /* Select the LWP (if any) that is currently being single-stepped. */
2912 select_singlestep_lwp_callback (thread_info
*thread
, void *data
)
2914 struct lwp_info
*lp
= get_thread_lwp (thread
);
2916 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2917 && thread
->last_resume_kind
== resume_step
2918 && lp
->status_pending_p
)
2924 /* Select the Nth LWP that has had an event. */
2927 select_event_lwp_callback (thread_info
*thread
, void *data
)
2929 struct lwp_info
*lp
= get_thread_lwp (thread
);
2930 int *selector
= (int *) data
;
2932 gdb_assert (selector
!= NULL
);
2934 /* Select only resumed LWPs that have an event pending. */
2935 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2936 && lp
->status_pending_p
)
2937 if ((*selector
)-- == 0)
2943 /* Select one LWP out of those that have events pending. */
2946 select_event_lwp (struct lwp_info
**orig_lp
)
2949 int random_selector
;
2950 struct thread_info
*event_thread
= NULL
;
2952 /* In all-stop, give preference to the LWP that is being
2953 single-stepped. There will be at most one, and it's the LWP that
2954 the core is most interested in. If we didn't do this, then we'd
2955 have to handle pending step SIGTRAPs somehow in case the core
2956 later continues the previously-stepped thread, otherwise we'd
2957 report the pending SIGTRAP, and the core, not having stepped the
2958 thread, wouldn't understand what the trap was for, and therefore
2959 would report it to the user as a random signal. */
2963 = (struct thread_info
*) find_inferior (&all_threads
,
2964 select_singlestep_lwp_callback
,
2966 if (event_thread
!= NULL
)
2969 debug_printf ("SEL: Select single-step %s\n",
2970 target_pid_to_str (ptid_of (event_thread
)));
2973 if (event_thread
== NULL
)
2975 /* No single-stepping LWP. Select one at random, out of those
2976 which have had events. */
2978 /* First see how many events we have. */
2979 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2980 gdb_assert (num_events
> 0);
2982 /* Now randomly pick a LWP out of those that have had
2984 random_selector
= (int)
2985 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2987 if (debug_threads
&& num_events
> 1)
2988 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2989 num_events
, random_selector
);
2992 = (struct thread_info
*) find_inferior (&all_threads
,
2993 select_event_lwp_callback
,
2997 if (event_thread
!= NULL
)
2999 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
3001 /* Switch the event LWP. */
3002 *orig_lp
= event_lp
;
3006 /* Decrement the suspend count of an LWP. */
3009 unsuspend_one_lwp (thread_info
*thread
, void *except
)
3011 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3013 /* Ignore EXCEPT. */
3017 lwp_suspended_decr (lwp
);
3021 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
3025 unsuspend_all_lwps (struct lwp_info
*except
)
3027 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
3030 static void move_out_of_jump_pad_callback (thread_info
*thread
);
3031 static int stuck_in_jump_pad_callback (thread_info
*thread
, void *data
);
3032 static int lwp_running (thread_info
*thread
, void *data
);
3033 static ptid_t
linux_wait_1 (ptid_t ptid
,
3034 struct target_waitstatus
*ourstatus
,
3035 int target_options
);
3037 /* Stabilize threads (move out of jump pads).
3039 If a thread is midway collecting a fast tracepoint, we need to
3040 finish the collection and move it out of the jump pad before
3041 reporting the signal.
3043 This avoids recursion while collecting (when a signal arrives
3044 midway, and the signal handler itself collects), which would trash
3045 the trace buffer. In case the user set a breakpoint in a signal
3046 handler, this avoids the backtrace showing the jump pad, etc..
3047 Most importantly, there are certain things we can't do safely if
3048 threads are stopped in a jump pad (or in its callee's). For
3051 - starting a new trace run. A thread still collecting the
3052 previous run, could trash the trace buffer when resumed. The trace
3053 buffer control structures would have been reset but the thread had
3054 no way to tell. The thread could even midway memcpy'ing to the
3055 buffer, which would mean that when resumed, it would clobber the
3056 trace buffer that had been set for a new run.
3058 - we can't rewrite/reuse the jump pads for new tracepoints
3059 safely. Say you do tstart while a thread is stopped midway while
3060 collecting. When the thread is later resumed, it finishes the
3061 collection, and returns to the jump pad, to execute the original
3062 instruction that was under the tracepoint jump at the time the
3063 older run had been started. If the jump pad had been rewritten
3064 since for something else in the new run, the thread would now
3065 execute the wrong / random instructions. */
3068 linux_stabilize_threads (void)
3070 struct thread_info
*saved_thread
;
3071 struct thread_info
*thread_stuck
;
3074 = (struct thread_info
*) find_inferior (&all_threads
,
3075 stuck_in_jump_pad_callback
,
3077 if (thread_stuck
!= NULL
)
3080 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
3081 lwpid_of (thread_stuck
));
3085 saved_thread
= current_thread
;
3087 stabilizing_threads
= 1;
3090 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
3092 /* Loop until all are stopped out of the jump pads. */
3093 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
3095 struct target_waitstatus ourstatus
;
3096 struct lwp_info
*lwp
;
3099 /* Note that we go through the full wait even loop. While
3100 moving threads out of jump pad, we need to be able to step
3101 over internal breakpoints and such. */
3102 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
3104 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
3106 lwp
= get_thread_lwp (current_thread
);
3109 lwp_suspended_inc (lwp
);
3111 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3112 || current_thread
->last_resume_kind
== resume_stop
)
3114 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3115 enqueue_one_deferred_signal (lwp
, &wstat
);
3120 unsuspend_all_lwps (NULL
);
3122 stabilizing_threads
= 0;
3124 current_thread
= saved_thread
;
3129 = (struct thread_info
*) find_inferior (&all_threads
,
3130 stuck_in_jump_pad_callback
,
3132 if (thread_stuck
!= NULL
)
3133 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3134 lwpid_of (thread_stuck
));
3138 /* Convenience function that is called when the kernel reports an
3139 event that is not passed out to GDB. */
3142 ignore_event (struct target_waitstatus
*ourstatus
)
3144 /* If we got an event, there may still be others, as a single
3145 SIGCHLD can indicate more than one child stopped. This forces
3146 another target_wait call. */
3149 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3153 /* Convenience function that is called when the kernel reports an exit
3154 event. This decides whether to report the event to GDB as a
3155 process exit event, a thread exit event, or to suppress the
3159 filter_exit_event (struct lwp_info
*event_child
,
3160 struct target_waitstatus
*ourstatus
)
3162 struct thread_info
*thread
= get_lwp_thread (event_child
);
3163 ptid_t ptid
= ptid_of (thread
);
3165 if (!last_thread_of_process_p (pid_of (thread
)))
3167 if (report_thread_events
)
3168 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3170 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3172 delete_lwp (event_child
);
3177 /* Returns 1 if GDB is interested in any event_child syscalls. */
3180 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3182 struct thread_info
*thread
= get_lwp_thread (event_child
);
3183 struct process_info
*proc
= get_thread_process (thread
);
3185 return !VEC_empty (int, proc
->syscalls_to_catch
);
3188 /* Returns 1 if GDB is interested in the event_child syscall.
3189 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3192 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3196 struct thread_info
*thread
= get_lwp_thread (event_child
);
3197 struct process_info
*proc
= get_thread_process (thread
);
3199 if (VEC_empty (int, proc
->syscalls_to_catch
))
3202 if (VEC_index (int, proc
->syscalls_to_catch
, 0) == ANY_SYSCALL
)
3205 get_syscall_trapinfo (event_child
, &sysno
);
3207 VEC_iterate (int, proc
->syscalls_to_catch
, i
, iter
);
3215 /* Wait for process, returns status. */
3218 linux_wait_1 (ptid_t ptid
,
3219 struct target_waitstatus
*ourstatus
, int target_options
)
3222 struct lwp_info
*event_child
;
3225 int step_over_finished
;
3226 int bp_explains_trap
;
3227 int maybe_internal_trap
;
3236 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3239 /* Translate generic target options into linux options. */
3241 if (target_options
& TARGET_WNOHANG
)
3244 bp_explains_trap
= 0;
3247 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3249 /* Find a resumed LWP, if any. */
3250 if (find_inferior (&all_threads
,
3251 status_pending_p_callback
,
3252 &minus_one_ptid
) != NULL
)
3254 else if ((find_inferior (&all_threads
,
3255 not_stopped_callback
,
3256 &minus_one_ptid
) != NULL
))
3261 if (ptid_equal (step_over_bkpt
, null_ptid
))
3262 pid
= linux_wait_for_event (ptid
, &w
, options
);
3266 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3267 target_pid_to_str (step_over_bkpt
));
3268 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3271 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3273 gdb_assert (target_options
& TARGET_WNOHANG
);
3277 debug_printf ("linux_wait_1 ret = null_ptid, "
3278 "TARGET_WAITKIND_IGNORE\n");
3282 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3289 debug_printf ("linux_wait_1 ret = null_ptid, "
3290 "TARGET_WAITKIND_NO_RESUMED\n");
3294 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3298 event_child
= get_thread_lwp (current_thread
);
3300 /* linux_wait_for_event only returns an exit status for the last
3301 child of a process. Report it. */
3302 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3306 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3307 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3311 debug_printf ("linux_wait_1 ret = %s, exited with "
3313 target_pid_to_str (ptid_of (current_thread
)),
3320 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3321 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3325 debug_printf ("linux_wait_1 ret = %s, terminated with "
3327 target_pid_to_str (ptid_of (current_thread
)),
3333 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3334 return filter_exit_event (event_child
, ourstatus
);
3336 return ptid_of (current_thread
);
3339 /* If step-over executes a breakpoint instruction, in the case of a
3340 hardware single step it means a gdb/gdbserver breakpoint had been
3341 planted on top of a permanent breakpoint, in the case of a software
3342 single step it may just mean that gdbserver hit the reinsert breakpoint.
3343 The PC has been adjusted by save_stop_reason to point at
3344 the breakpoint address.
3345 So in the case of the hardware single step advance the PC manually
3346 past the breakpoint and in the case of software single step advance only
3347 if it's not the single_step_breakpoint we are hitting.
3348 This avoids that a program would keep trapping a permanent breakpoint
3350 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3351 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3352 && (event_child
->stepping
3353 || !single_step_breakpoint_inserted_here (event_child
->stop_pc
)))
3355 int increment_pc
= 0;
3356 int breakpoint_kind
= 0;
3357 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3360 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3361 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3365 debug_printf ("step-over for %s executed software breakpoint\n",
3366 target_pid_to_str (ptid_of (current_thread
)));
3369 if (increment_pc
!= 0)
3371 struct regcache
*regcache
3372 = get_thread_regcache (current_thread
, 1);
3374 event_child
->stop_pc
+= increment_pc
;
3375 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3377 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3378 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3382 /* If this event was not handled before, and is not a SIGTRAP, we
3383 report it. SIGILL and SIGSEGV are also treated as traps in case
3384 a breakpoint is inserted at the current PC. If this target does
3385 not support internal breakpoints at all, we also report the
3386 SIGTRAP without further processing; it's of no concern to us. */
3388 = (supports_breakpoints ()
3389 && (WSTOPSIG (w
) == SIGTRAP
3390 || ((WSTOPSIG (w
) == SIGILL
3391 || WSTOPSIG (w
) == SIGSEGV
)
3392 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3394 if (maybe_internal_trap
)
3396 /* Handle anything that requires bookkeeping before deciding to
3397 report the event or continue waiting. */
3399 /* First check if we can explain the SIGTRAP with an internal
3400 breakpoint, or if we should possibly report the event to GDB.
3401 Do this before anything that may remove or insert a
3403 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3405 /* We have a SIGTRAP, possibly a step-over dance has just
3406 finished. If so, tweak the state machine accordingly,
3407 reinsert breakpoints and delete any single-step
3409 step_over_finished
= finish_step_over (event_child
);
3411 /* Now invoke the callbacks of any internal breakpoints there. */
3412 check_breakpoints (event_child
->stop_pc
);
3414 /* Handle tracepoint data collecting. This may overflow the
3415 trace buffer, and cause a tracing stop, removing
3417 trace_event
= handle_tracepoints (event_child
);
3419 if (bp_explains_trap
)
3422 debug_printf ("Hit a gdbserver breakpoint.\n");
3427 /* We have some other signal, possibly a step-over dance was in
3428 progress, and it should be cancelled too. */
3429 step_over_finished
= finish_step_over (event_child
);
3432 /* We have all the data we need. Either report the event to GDB, or
3433 resume threads and keep waiting for more. */
3435 /* If we're collecting a fast tracepoint, finish the collection and
3436 move out of the jump pad before delivering a signal. See
3437 linux_stabilize_threads. */
3440 && WSTOPSIG (w
) != SIGTRAP
3441 && supports_fast_tracepoints ()
3442 && agent_loaded_p ())
3445 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3446 "to defer or adjust it.\n",
3447 WSTOPSIG (w
), lwpid_of (current_thread
));
3449 /* Allow debugging the jump pad itself. */
3450 if (current_thread
->last_resume_kind
!= resume_step
3451 && maybe_move_out_of_jump_pad (event_child
, &w
))
3453 enqueue_one_deferred_signal (event_child
, &w
);
3456 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3457 WSTOPSIG (w
), lwpid_of (current_thread
));
3459 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3463 return ignore_event (ourstatus
);
3467 if (event_child
->collecting_fast_tracepoint
3468 != fast_tpoint_collect_result::not_collecting
)
3471 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3472 "Check if we're already there.\n",
3473 lwpid_of (current_thread
),
3474 (int) event_child
->collecting_fast_tracepoint
);
3478 event_child
->collecting_fast_tracepoint
3479 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3481 if (event_child
->collecting_fast_tracepoint
3482 != fast_tpoint_collect_result::before_insn
)
3484 /* No longer need this breakpoint. */
3485 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3488 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3489 "stopping all threads momentarily.\n");
3491 /* Other running threads could hit this breakpoint.
3492 We don't handle moribund locations like GDB does,
3493 instead we always pause all threads when removing
3494 breakpoints, so that any step-over or
3495 decr_pc_after_break adjustment is always taken
3496 care of while the breakpoint is still
3498 stop_all_lwps (1, event_child
);
3500 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3501 event_child
->exit_jump_pad_bkpt
= NULL
;
3503 unstop_all_lwps (1, event_child
);
3505 gdb_assert (event_child
->suspended
>= 0);
3509 if (event_child
->collecting_fast_tracepoint
3510 == fast_tpoint_collect_result::not_collecting
)
3513 debug_printf ("fast tracepoint finished "
3514 "collecting successfully.\n");
3516 /* We may have a deferred signal to report. */
3517 if (dequeue_one_deferred_signal (event_child
, &w
))
3520 debug_printf ("dequeued one signal.\n");
3525 debug_printf ("no deferred signals.\n");
3527 if (stabilizing_threads
)
3529 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3530 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3534 debug_printf ("linux_wait_1 ret = %s, stopped "
3535 "while stabilizing threads\n",
3536 target_pid_to_str (ptid_of (current_thread
)));
3540 return ptid_of (current_thread
);
3546 /* Check whether GDB would be interested in this event. */
3548 /* Check if GDB is interested in this syscall. */
3550 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3551 && !gdb_catch_this_syscall_p (event_child
))
3555 debug_printf ("Ignored syscall for LWP %ld.\n",
3556 lwpid_of (current_thread
));
3559 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3564 return ignore_event (ourstatus
);
3567 /* If GDB is not interested in this signal, don't stop other
3568 threads, and don't report it to GDB. Just resume the inferior
3569 right away. We do this for threading-related signals as well as
3570 any that GDB specifically requested we ignore. But never ignore
3571 SIGSTOP if we sent it ourselves, and do not ignore signals when
3572 stepping - they may require special handling to skip the signal
3573 handler. Also never ignore signals that could be caused by a
3576 && current_thread
->last_resume_kind
!= resume_step
3578 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3579 (current_process ()->priv
->thread_db
!= NULL
3580 && (WSTOPSIG (w
) == __SIGRTMIN
3581 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3584 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3585 && !(WSTOPSIG (w
) == SIGSTOP
3586 && current_thread
->last_resume_kind
== resume_stop
)
3587 && !linux_wstatus_maybe_breakpoint (w
))))
3589 siginfo_t info
, *info_p
;
3592 debug_printf ("Ignored signal %d for LWP %ld.\n",
3593 WSTOPSIG (w
), lwpid_of (current_thread
));
3595 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3596 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3601 if (step_over_finished
)
3603 /* We cancelled this thread's step-over above. We still
3604 need to unsuspend all other LWPs, and set them back
3605 running again while the signal handler runs. */
3606 unsuspend_all_lwps (event_child
);
3608 /* Enqueue the pending signal info so that proceed_all_lwps
3610 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3612 proceed_all_lwps ();
3616 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3617 WSTOPSIG (w
), info_p
);
3623 return ignore_event (ourstatus
);
3626 /* Note that all addresses are always "out of the step range" when
3627 there's no range to begin with. */
3628 in_step_range
= lwp_in_step_range (event_child
);
3630 /* If GDB wanted this thread to single step, and the thread is out
3631 of the step range, we always want to report the SIGTRAP, and let
3632 GDB handle it. Watchpoints should always be reported. So should
3633 signals we can't explain. A SIGTRAP we can't explain could be a
3634 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3635 do, we're be able to handle GDB breakpoints on top of internal
3636 breakpoints, by handling the internal breakpoint and still
3637 reporting the event to GDB. If we don't, we're out of luck, GDB
3638 won't see the breakpoint hit. If we see a single-step event but
3639 the thread should be continuing, don't pass the trap to gdb.
3640 That indicates that we had previously finished a single-step but
3641 left the single-step pending -- see
3642 complete_ongoing_step_over. */
3643 report_to_gdb
= (!maybe_internal_trap
3644 || (current_thread
->last_resume_kind
== resume_step
3646 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3648 && !bp_explains_trap
3650 && !step_over_finished
3651 && !(current_thread
->last_resume_kind
== resume_continue
3652 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3653 || (gdb_breakpoint_here (event_child
->stop_pc
)
3654 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3655 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3656 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3658 run_breakpoint_commands (event_child
->stop_pc
);
3660 /* We found no reason GDB would want us to stop. We either hit one
3661 of our own breakpoints, or finished an internal step GDB
3662 shouldn't know about. */
3667 if (bp_explains_trap
)
3668 debug_printf ("Hit a gdbserver breakpoint.\n");
3669 if (step_over_finished
)
3670 debug_printf ("Step-over finished.\n");
3672 debug_printf ("Tracepoint event.\n");
3673 if (lwp_in_step_range (event_child
))
3674 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3675 paddress (event_child
->stop_pc
),
3676 paddress (event_child
->step_range_start
),
3677 paddress (event_child
->step_range_end
));
3680 /* We're not reporting this breakpoint to GDB, so apply the
3681 decr_pc_after_break adjustment to the inferior's regcache
3684 if (the_low_target
.set_pc
!= NULL
)
3686 struct regcache
*regcache
3687 = get_thread_regcache (current_thread
, 1);
3688 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3691 if (step_over_finished
)
3693 /* If we have finished stepping over a breakpoint, we've
3694 stopped and suspended all LWPs momentarily except the
3695 stepping one. This is where we resume them all again.
3696 We're going to keep waiting, so use proceed, which
3697 handles stepping over the next breakpoint. */
3698 unsuspend_all_lwps (event_child
);
3702 /* Remove the single-step breakpoints if any. Note that
3703 there isn't single-step breakpoint if we finished stepping
3705 if (can_software_single_step ()
3706 && has_single_step_breakpoints (current_thread
))
3708 stop_all_lwps (0, event_child
);
3709 delete_single_step_breakpoints (current_thread
);
3710 unstop_all_lwps (0, event_child
);
3715 debug_printf ("proceeding all threads.\n");
3716 proceed_all_lwps ();
3721 return ignore_event (ourstatus
);
3726 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3729 = target_waitstatus_to_string (&event_child
->waitstatus
);
3731 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3732 lwpid_of (get_lwp_thread (event_child
)), str
.c_str ());
3734 if (current_thread
->last_resume_kind
== resume_step
)
3736 if (event_child
->step_range_start
== event_child
->step_range_end
)
3737 debug_printf ("GDB wanted to single-step, reporting event.\n");
3738 else if (!lwp_in_step_range (event_child
))
3739 debug_printf ("Out of step range, reporting event.\n");
3741 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3742 debug_printf ("Stopped by watchpoint.\n");
3743 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3744 debug_printf ("Stopped by GDB breakpoint.\n");
3746 debug_printf ("Hit a non-gdbserver trap event.\n");
3749 /* Alright, we're going to report a stop. */
3751 /* Remove single-step breakpoints. */
3752 if (can_software_single_step ())
3754 /* Remove single-step breakpoints or not. It it is true, stop all
3755 lwps, so that other threads won't hit the breakpoint in the
3757 int remove_single_step_breakpoints_p
= 0;
3761 remove_single_step_breakpoints_p
3762 = has_single_step_breakpoints (current_thread
);
3766 /* In all-stop, a stop reply cancels all previous resume
3767 requests. Delete all single-step breakpoints. */
3769 find_thread ([&] (thread_info
*thread
) {
3770 if (has_single_step_breakpoints (thread
))
3772 remove_single_step_breakpoints_p
= 1;
3780 if (remove_single_step_breakpoints_p
)
3782 /* If we remove single-step breakpoints from memory, stop all lwps,
3783 so that other threads won't hit the breakpoint in the staled
3785 stop_all_lwps (0, event_child
);
3789 gdb_assert (has_single_step_breakpoints (current_thread
));
3790 delete_single_step_breakpoints (current_thread
);
3794 for_each_thread ([] (thread_info
*thread
){
3795 if (has_single_step_breakpoints (thread
))
3796 delete_single_step_breakpoints (thread
);
3800 unstop_all_lwps (0, event_child
);
3804 if (!stabilizing_threads
)
3806 /* In all-stop, stop all threads. */
3808 stop_all_lwps (0, NULL
);
3810 if (step_over_finished
)
3814 /* If we were doing a step-over, all other threads but
3815 the stepping one had been paused in start_step_over,
3816 with their suspend counts incremented. We don't want
3817 to do a full unstop/unpause, because we're in
3818 all-stop mode (so we want threads stopped), but we
3819 still need to unsuspend the other threads, to
3820 decrement their `suspended' count back. */
3821 unsuspend_all_lwps (event_child
);
3825 /* If we just finished a step-over, then all threads had
3826 been momentarily paused. In all-stop, that's fine,
3827 we want threads stopped by now anyway. In non-stop,
3828 we need to re-resume threads that GDB wanted to be
3830 unstop_all_lwps (1, event_child
);
3834 /* If we're not waiting for a specific LWP, choose an event LWP
3835 from among those that have had events. Giving equal priority
3836 to all LWPs that have had events helps prevent
3838 if (ptid_equal (ptid
, minus_one_ptid
))
3840 event_child
->status_pending_p
= 1;
3841 event_child
->status_pending
= w
;
3843 select_event_lwp (&event_child
);
3845 /* current_thread and event_child must stay in sync. */
3846 current_thread
= get_lwp_thread (event_child
);
3848 event_child
->status_pending_p
= 0;
3849 w
= event_child
->status_pending
;
3853 /* Stabilize threads (move out of jump pads). */
3855 stabilize_threads ();
3859 /* If we just finished a step-over, then all threads had been
3860 momentarily paused. In all-stop, that's fine, we want
3861 threads stopped by now anyway. In non-stop, we need to
3862 re-resume threads that GDB wanted to be running. */
3863 if (step_over_finished
)
3864 unstop_all_lwps (1, event_child
);
3867 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3869 /* If the reported event is an exit, fork, vfork or exec, let
3872 /* Break the unreported fork relationship chain. */
3873 if (event_child
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
3874 || event_child
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
)
3876 event_child
->fork_relative
->fork_relative
= NULL
;
3877 event_child
->fork_relative
= NULL
;
3880 *ourstatus
= event_child
->waitstatus
;
3881 /* Clear the event lwp's waitstatus since we handled it already. */
3882 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3885 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3887 /* Now that we've selected our final event LWP, un-adjust its PC if
3888 it was a software breakpoint, and the client doesn't know we can
3889 adjust the breakpoint ourselves. */
3890 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3891 && !swbreak_feature
)
3893 int decr_pc
= the_low_target
.decr_pc_after_break
;
3897 struct regcache
*regcache
3898 = get_thread_regcache (current_thread
, 1);
3899 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3903 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3905 get_syscall_trapinfo (event_child
,
3906 &ourstatus
->value
.syscall_number
);
3907 ourstatus
->kind
= event_child
->syscall_state
;
3909 else if (current_thread
->last_resume_kind
== resume_stop
3910 && WSTOPSIG (w
) == SIGSTOP
)
3912 /* A thread that has been requested to stop by GDB with vCont;t,
3913 and it stopped cleanly, so report as SIG0. The use of
3914 SIGSTOP is an implementation detail. */
3915 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3917 else if (current_thread
->last_resume_kind
== resume_stop
3918 && WSTOPSIG (w
) != SIGSTOP
)
3920 /* A thread that has been requested to stop by GDB with vCont;t,
3921 but, it stopped for other reasons. */
3922 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3924 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3926 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3929 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3933 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3934 target_pid_to_str (ptid_of (current_thread
)),
3935 ourstatus
->kind
, ourstatus
->value
.sig
);
3939 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3940 return filter_exit_event (event_child
, ourstatus
);
3942 return ptid_of (current_thread
);
3945 /* Get rid of any pending event in the pipe. */
3947 async_file_flush (void)
3953 ret
= read (linux_event_pipe
[0], &buf
, 1);
3954 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3957 /* Put something in the pipe, so the event loop wakes up. */
3959 async_file_mark (void)
3963 async_file_flush ();
3966 ret
= write (linux_event_pipe
[1], "+", 1);
3967 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3969 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3970 be awakened anyway. */
3974 linux_wait (ptid_t ptid
,
3975 struct target_waitstatus
*ourstatus
, int target_options
)
3979 /* Flush the async file first. */
3980 if (target_is_async_p ())
3981 async_file_flush ();
3985 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3987 while ((target_options
& TARGET_WNOHANG
) == 0
3988 && ptid_equal (event_ptid
, null_ptid
)
3989 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3991 /* If at least one stop was reported, there may be more. A single
3992 SIGCHLD can signal more than one child stop. */
3993 if (target_is_async_p ()
3994 && (target_options
& TARGET_WNOHANG
) != 0
3995 && !ptid_equal (event_ptid
, null_ptid
))
4001 /* Send a signal to an LWP. */
4004 kill_lwp (unsigned long lwpid
, int signo
)
4009 ret
= syscall (__NR_tkill
, lwpid
, signo
);
4010 if (errno
== ENOSYS
)
4012 /* If tkill fails, then we are not using nptl threads, a
4013 configuration we no longer support. */
4014 perror_with_name (("tkill"));
4020 linux_stop_lwp (struct lwp_info
*lwp
)
4026 send_sigstop (struct lwp_info
*lwp
)
4030 pid
= lwpid_of (get_lwp_thread (lwp
));
4032 /* If we already have a pending stop signal for this process, don't
4034 if (lwp
->stop_expected
)
4037 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
4043 debug_printf ("Sending sigstop to lwp %d\n", pid
);
4045 lwp
->stop_expected
= 1;
4046 kill_lwp (pid
, SIGSTOP
);
4050 send_sigstop_callback (thread_info
*thread
, void *except
)
4052 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4054 /* Ignore EXCEPT. */
4065 /* Increment the suspend count of an LWP, and stop it, if not stopped
4068 suspend_and_send_sigstop_callback (thread_info
*thread
, void *except
)
4070 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4072 /* Ignore EXCEPT. */
4076 lwp_suspended_inc (lwp
);
4078 return send_sigstop_callback (thread
, except
);
4082 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
4084 /* Store the exit status for later. */
4085 lwp
->status_pending_p
= 1;
4086 lwp
->status_pending
= wstat
;
4088 /* Store in waitstatus as well, as there's nothing else to process
4090 if (WIFEXITED (wstat
))
4092 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
4093 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
4095 else if (WIFSIGNALED (wstat
))
4097 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
4098 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
4101 /* Prevent trying to stop it. */
4104 /* No further stops are expected from a dead lwp. */
4105 lwp
->stop_expected
= 0;
4108 /* Return true if LWP has exited already, and has a pending exit event
4109 to report to GDB. */
4112 lwp_is_marked_dead (struct lwp_info
*lwp
)
4114 return (lwp
->status_pending_p
4115 && (WIFEXITED (lwp
->status_pending
)
4116 || WIFSIGNALED (lwp
->status_pending
)));
4119 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4122 wait_for_sigstop (void)
4124 struct thread_info
*saved_thread
;
4129 saved_thread
= current_thread
;
4130 if (saved_thread
!= NULL
)
4131 saved_tid
= saved_thread
->id
;
4133 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4136 debug_printf ("wait_for_sigstop: pulling events\n");
4138 /* Passing NULL_PTID as filter indicates we want all events to be
4139 left pending. Eventually this returns when there are no
4140 unwaited-for children left. */
4141 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4143 gdb_assert (ret
== -1);
4145 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4146 current_thread
= saved_thread
;
4150 debug_printf ("Previously current thread died.\n");
4152 /* We can't change the current inferior behind GDB's back,
4153 otherwise, a subsequent command may apply to the wrong
4155 current_thread
= NULL
;
4159 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
4160 move it out, because we need to report the stop event to GDB. For
4161 example, if the user puts a breakpoint in the jump pad, it's
4162 because she wants to debug it. */
4165 stuck_in_jump_pad_callback (thread_info
*thread
, void *data
)
4167 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4169 if (lwp
->suspended
!= 0)
4171 internal_error (__FILE__
, __LINE__
,
4172 "LWP %ld is suspended, suspended=%d\n",
4173 lwpid_of (thread
), lwp
->suspended
);
4175 gdb_assert (lwp
->stopped
);
4177 /* Allow debugging the jump pad, gdb_collect, etc.. */
4178 return (supports_fast_tracepoints ()
4179 && agent_loaded_p ()
4180 && (gdb_breakpoint_here (lwp
->stop_pc
)
4181 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4182 || thread
->last_resume_kind
== resume_step
)
4183 && (linux_fast_tracepoint_collecting (lwp
, NULL
)
4184 != fast_tpoint_collect_result::not_collecting
));
4188 move_out_of_jump_pad_callback (thread_info
*thread
)
4190 struct thread_info
*saved_thread
;
4191 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4194 if (lwp
->suspended
!= 0)
4196 internal_error (__FILE__
, __LINE__
,
4197 "LWP %ld is suspended, suspended=%d\n",
4198 lwpid_of (thread
), lwp
->suspended
);
4200 gdb_assert (lwp
->stopped
);
4202 /* For gdb_breakpoint_here. */
4203 saved_thread
= current_thread
;
4204 current_thread
= thread
;
4206 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4208 /* Allow debugging the jump pad, gdb_collect, etc. */
4209 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4210 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4211 && thread
->last_resume_kind
!= resume_step
4212 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4215 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4220 lwp
->status_pending_p
= 0;
4221 enqueue_one_deferred_signal (lwp
, wstat
);
4224 debug_printf ("Signal %d for LWP %ld deferred "
4226 WSTOPSIG (*wstat
), lwpid_of (thread
));
4229 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4232 lwp_suspended_inc (lwp
);
4234 current_thread
= saved_thread
;
4238 lwp_running (thread_info
*thread
, void *data
)
4240 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4242 if (lwp_is_marked_dead (lwp
))
4249 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4250 If SUSPEND, then also increase the suspend count of every LWP,
4254 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4256 /* Should not be called recursively. */
4257 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4262 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4263 suspend
? "stop-and-suspend" : "stop",
4265 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4269 stopping_threads
= (suspend
4270 ? STOPPING_AND_SUSPENDING_THREADS
4271 : STOPPING_THREADS
);
4274 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
4276 find_inferior (&all_threads
, send_sigstop_callback
, except
);
4277 wait_for_sigstop ();
4278 stopping_threads
= NOT_STOPPING_THREADS
;
4282 debug_printf ("stop_all_lwps done, setting stopping_threads "
4283 "back to !stopping\n");
4288 /* Enqueue one signal in the chain of signals which need to be
4289 delivered to this process on next resume. */
4292 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4294 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4296 p_sig
->prev
= lwp
->pending_signals
;
4297 p_sig
->signal
= signal
;
4299 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4301 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4302 lwp
->pending_signals
= p_sig
;
4305 /* Install breakpoints for software single stepping. */
4308 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4310 struct thread_info
*thread
= get_lwp_thread (lwp
);
4311 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4312 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
4314 current_thread
= thread
;
4315 std::vector
<CORE_ADDR
> next_pcs
= the_low_target
.get_next_pcs (regcache
);
4317 for (CORE_ADDR pc
: next_pcs
)
4318 set_single_step_breakpoint (pc
, current_ptid
);
4320 do_cleanups (old_chain
);
4323 /* Single step via hardware or software single step.
4324 Return 1 if hardware single stepping, 0 if software single stepping
4325 or can't single step. */
4328 single_step (struct lwp_info
* lwp
)
4332 if (can_hardware_single_step ())
4336 else if (can_software_single_step ())
4338 install_software_single_step_breakpoints (lwp
);
4344 debug_printf ("stepping is not implemented on this target");
4350 /* The signal can be delivered to the inferior if we are not trying to
4351 finish a fast tracepoint collect. Since signal can be delivered in
4352 the step-over, the program may go to signal handler and trap again
4353 after return from the signal handler. We can live with the spurious
4357 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4359 return (lwp
->collecting_fast_tracepoint
4360 == fast_tpoint_collect_result::not_collecting
);
4363 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4364 SIGNAL is nonzero, give it that signal. */
4367 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4368 int step
, int signal
, siginfo_t
*info
)
4370 struct thread_info
*thread
= get_lwp_thread (lwp
);
4371 struct thread_info
*saved_thread
;
4373 struct process_info
*proc
= get_thread_process (thread
);
4375 /* Note that target description may not be initialised
4376 (proc->tdesc == NULL) at this point because the program hasn't
4377 stopped at the first instruction yet. It means GDBserver skips
4378 the extra traps from the wrapper program (see option --wrapper).
4379 Code in this function that requires register access should be
4380 guarded by proc->tdesc == NULL or something else. */
4382 if (lwp
->stopped
== 0)
4385 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4387 fast_tpoint_collect_result fast_tp_collecting
4388 = lwp
->collecting_fast_tracepoint
;
4390 gdb_assert (!stabilizing_threads
4391 || (fast_tp_collecting
4392 != fast_tpoint_collect_result::not_collecting
));
4394 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4395 user used the "jump" command, or "set $pc = foo"). */
4396 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4398 /* Collecting 'while-stepping' actions doesn't make sense
4400 release_while_stepping_state_list (thread
);
4403 /* If we have pending signals or status, and a new signal, enqueue the
4404 signal. Also enqueue the signal if it can't be delivered to the
4405 inferior right now. */
4407 && (lwp
->status_pending_p
4408 || lwp
->pending_signals
!= NULL
4409 || !lwp_signal_can_be_delivered (lwp
)))
4411 enqueue_pending_signal (lwp
, signal
, info
);
4413 /* Postpone any pending signal. It was enqueued above. */
4417 if (lwp
->status_pending_p
)
4420 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4421 " has pending status\n",
4422 lwpid_of (thread
), step
? "step" : "continue",
4423 lwp
->stop_expected
? "expected" : "not expected");
4427 saved_thread
= current_thread
;
4428 current_thread
= thread
;
4430 /* This bit needs some thinking about. If we get a signal that
4431 we must report while a single-step reinsert is still pending,
4432 we often end up resuming the thread. It might be better to
4433 (ew) allow a stack of pending events; then we could be sure that
4434 the reinsert happened right away and not lose any signals.
4436 Making this stack would also shrink the window in which breakpoints are
4437 uninserted (see comment in linux_wait_for_lwp) but not enough for
4438 complete correctness, so it won't solve that problem. It may be
4439 worthwhile just to solve this one, however. */
4440 if (lwp
->bp_reinsert
!= 0)
4443 debug_printf (" pending reinsert at 0x%s\n",
4444 paddress (lwp
->bp_reinsert
));
4446 if (can_hardware_single_step ())
4448 if (fast_tp_collecting
== fast_tpoint_collect_result::not_collecting
)
4451 warning ("BAD - reinserting but not stepping.");
4453 warning ("BAD - reinserting and suspended(%d).",
4458 step
= maybe_hw_step (thread
);
4461 if (fast_tp_collecting
== fast_tpoint_collect_result::before_insn
)
4464 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4465 " (exit-jump-pad-bkpt)\n",
4468 else if (fast_tp_collecting
== fast_tpoint_collect_result::at_insn
)
4471 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4472 " single-stepping\n",
4475 if (can_hardware_single_step ())
4479 internal_error (__FILE__
, __LINE__
,
4480 "moving out of jump pad single-stepping"
4481 " not implemented on this target");
4485 /* If we have while-stepping actions in this thread set it stepping.
4486 If we have a signal to deliver, it may or may not be set to
4487 SIG_IGN, we don't know. Assume so, and allow collecting
4488 while-stepping into a signal handler. A possible smart thing to
4489 do would be to set an internal breakpoint at the signal return
4490 address, continue, and carry on catching this while-stepping
4491 action only when that breakpoint is hit. A future
4493 if (thread
->while_stepping
!= NULL
)
4496 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4499 step
= single_step (lwp
);
4502 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4504 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4506 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4510 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4511 (long) lwp
->stop_pc
);
4515 /* If we have pending signals, consume one if it can be delivered to
4517 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4519 struct pending_signals
**p_sig
;
4521 p_sig
= &lwp
->pending_signals
;
4522 while ((*p_sig
)->prev
!= NULL
)
4523 p_sig
= &(*p_sig
)->prev
;
4525 signal
= (*p_sig
)->signal
;
4526 if ((*p_sig
)->info
.si_signo
!= 0)
4527 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4535 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4536 lwpid_of (thread
), step
? "step" : "continue", signal
,
4537 lwp
->stop_expected
? "expected" : "not expected");
4539 if (the_low_target
.prepare_to_resume
!= NULL
)
4540 the_low_target
.prepare_to_resume (lwp
);
4542 regcache_invalidate_thread (thread
);
4544 lwp
->stepping
= step
;
4546 ptrace_request
= PTRACE_SINGLESTEP
;
4547 else if (gdb_catching_syscalls_p (lwp
))
4548 ptrace_request
= PTRACE_SYSCALL
;
4550 ptrace_request
= PTRACE_CONT
;
4551 ptrace (ptrace_request
,
4553 (PTRACE_TYPE_ARG3
) 0,
4554 /* Coerce to a uintptr_t first to avoid potential gcc warning
4555 of coercing an 8 byte integer to a 4 byte pointer. */
4556 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4558 current_thread
= saved_thread
;
4560 perror_with_name ("resuming thread");
4562 /* Successfully resumed. Clear state that no longer makes sense,
4563 and mark the LWP as running. Must not do this before resuming
4564 otherwise if that fails other code will be confused. E.g., we'd
4565 later try to stop the LWP and hang forever waiting for a stop
4566 status. Note that we must not throw after this is cleared,
4567 otherwise handle_zombie_lwp_error would get confused. */
4569 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4572 /* Called when we try to resume a stopped LWP and that errors out. If
4573 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4574 or about to become), discard the error, clear any pending status
4575 the LWP may have, and return true (we'll collect the exit status
4576 soon enough). Otherwise, return false. */
4579 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4581 struct thread_info
*thread
= get_lwp_thread (lp
);
4583 /* If we get an error after resuming the LWP successfully, we'd
4584 confuse !T state for the LWP being gone. */
4585 gdb_assert (lp
->stopped
);
4587 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4588 because even if ptrace failed with ESRCH, the tracee may be "not
4589 yet fully dead", but already refusing ptrace requests. In that
4590 case the tracee has 'R (Running)' state for a little bit
4591 (observed in Linux 3.18). See also the note on ESRCH in the
4592 ptrace(2) man page. Instead, check whether the LWP has any state
4593 other than ptrace-stopped. */
4595 /* Don't assume anything if /proc/PID/status can't be read. */
4596 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4598 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4599 lp
->status_pending_p
= 0;
4605 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4606 disappears while we try to resume it. */
4609 linux_resume_one_lwp (struct lwp_info
*lwp
,
4610 int step
, int signal
, siginfo_t
*info
)
4614 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4616 CATCH (ex
, RETURN_MASK_ERROR
)
4618 if (!check_ptrace_stopped_lwp_gone (lwp
))
4619 throw_exception (ex
);
4624 struct thread_resume_array
4626 struct thread_resume
*resume
;
4630 /* This function is called once per thread via find_inferior.
4631 ARG is a pointer to a thread_resume_array struct.
4632 We look up the thread specified by ENTRY in ARG, and mark the thread
4633 with a pointer to the appropriate resume request.
4635 This algorithm is O(threads * resume elements), but resume elements
4636 is small (and will remain small at least until GDB supports thread
4640 linux_set_resume_request (thread_info
*thread
, void *arg
)
4642 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4644 struct thread_resume_array
*r
;
4646 r
= (struct thread_resume_array
*) arg
;
4648 for (ndx
= 0; ndx
< r
->n
; ndx
++)
4650 ptid_t ptid
= r
->resume
[ndx
].thread
;
4651 if (ptid_equal (ptid
, minus_one_ptid
)
4652 || ptid
== thread
->id
4653 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4655 || (ptid_get_pid (ptid
) == pid_of (thread
)
4656 && (ptid_is_pid (ptid
)
4657 || ptid_get_lwp (ptid
) == -1)))
4659 if (r
->resume
[ndx
].kind
== resume_stop
4660 && thread
->last_resume_kind
== resume_stop
)
4663 debug_printf ("already %s LWP %ld at GDB's request\n",
4664 (thread
->last_status
.kind
4665 == TARGET_WAITKIND_STOPPED
)
4673 /* Ignore (wildcard) resume requests for already-resumed
4675 if (r
->resume
[ndx
].kind
!= resume_stop
4676 && thread
->last_resume_kind
!= resume_stop
)
4679 debug_printf ("already %s LWP %ld at GDB's request\n",
4680 (thread
->last_resume_kind
4688 /* Don't let wildcard resumes resume fork children that GDB
4689 does not yet know are new fork children. */
4690 if (lwp
->fork_relative
!= NULL
)
4692 struct lwp_info
*rel
= lwp
->fork_relative
;
4694 if (rel
->status_pending_p
4695 && (rel
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
4696 || rel
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
))
4699 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4705 /* If the thread has a pending event that has already been
4706 reported to GDBserver core, but GDB has not pulled the
4707 event out of the vStopped queue yet, likewise, ignore the
4708 (wildcard) resume request. */
4709 if (in_queued_stop_replies (thread
->id
))
4712 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4717 lwp
->resume
= &r
->resume
[ndx
];
4718 thread
->last_resume_kind
= lwp
->resume
->kind
;
4720 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4721 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4723 /* If we had a deferred signal to report, dequeue one now.
4724 This can happen if LWP gets more than one signal while
4725 trying to get out of a jump pad. */
4727 && !lwp
->status_pending_p
4728 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4730 lwp
->status_pending_p
= 1;
4733 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4734 "leaving status pending.\n",
4735 WSTOPSIG (lwp
->status_pending
),
4743 /* No resume action for this thread. */
4749 /* find_inferior callback for linux_resume.
4750 Set *FLAG_P if this lwp has an interesting status pending. */
4753 resume_status_pending_p (thread_info
*thread
, void *flag_p
)
4755 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4757 /* LWPs which will not be resumed are not interesting, because
4758 we might not wait for them next time through linux_wait. */
4759 if (lwp
->resume
== NULL
)
4762 if (thread_still_has_status_pending_p (thread
))
4763 * (int *) flag_p
= 1;
4768 /* Return 1 if this lwp that GDB wants running is stopped at an
4769 internal breakpoint that we need to step over. It assumes that any
4770 required STOP_PC adjustment has already been propagated to the
4771 inferior's regcache. */
4774 need_step_over_p (thread_info
*thread
, void *dummy
)
4776 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4777 struct thread_info
*saved_thread
;
4779 struct process_info
*proc
= get_thread_process (thread
);
4781 /* GDBserver is skipping the extra traps from the wrapper program,
4782 don't have to do step over. */
4783 if (proc
->tdesc
== NULL
)
4786 /* LWPs which will not be resumed are not interesting, because we
4787 might not wait for them next time through linux_wait. */
4792 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4797 if (thread
->last_resume_kind
== resume_stop
)
4800 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4806 gdb_assert (lwp
->suspended
>= 0);
4811 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4816 if (lwp
->status_pending_p
)
4819 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4825 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4829 /* If the PC has changed since we stopped, then don't do anything,
4830 and let the breakpoint/tracepoint be hit. This happens if, for
4831 instance, GDB handled the decr_pc_after_break subtraction itself,
4832 GDB is OOL stepping this thread, or the user has issued a "jump"
4833 command, or poked thread's registers herself. */
4834 if (pc
!= lwp
->stop_pc
)
4837 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4838 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4840 paddress (lwp
->stop_pc
), paddress (pc
));
4844 /* On software single step target, resume the inferior with signal
4845 rather than stepping over. */
4846 if (can_software_single_step ()
4847 && lwp
->pending_signals
!= NULL
4848 && lwp_signal_can_be_delivered (lwp
))
4851 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4858 saved_thread
= current_thread
;
4859 current_thread
= thread
;
4861 /* We can only step over breakpoints we know about. */
4862 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4864 /* Don't step over a breakpoint that GDB expects to hit
4865 though. If the condition is being evaluated on the target's side
4866 and it evaluate to false, step over this breakpoint as well. */
4867 if (gdb_breakpoint_here (pc
)
4868 && gdb_condition_true_at_breakpoint (pc
)
4869 && gdb_no_commands_at_breakpoint (pc
))
4872 debug_printf ("Need step over [LWP %ld]? yes, but found"
4873 " GDB breakpoint at 0x%s; skipping step over\n",
4874 lwpid_of (thread
), paddress (pc
));
4876 current_thread
= saved_thread
;
4882 debug_printf ("Need step over [LWP %ld]? yes, "
4883 "found breakpoint at 0x%s\n",
4884 lwpid_of (thread
), paddress (pc
));
4886 /* We've found an lwp that needs stepping over --- return 1 so
4887 that find_inferior stops looking. */
4888 current_thread
= saved_thread
;
4894 current_thread
= saved_thread
;
4897 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4899 lwpid_of (thread
), paddress (pc
));
4904 /* Start a step-over operation on LWP. When LWP stopped at a
4905 breakpoint, to make progress, we need to remove the breakpoint out
4906 of the way. If we let other threads run while we do that, they may
4907 pass by the breakpoint location and miss hitting it. To avoid
4908 that, a step-over momentarily stops all threads while LWP is
4909 single-stepped by either hardware or software while the breakpoint
4910 is temporarily uninserted from the inferior. When the single-step
4911 finishes, we reinsert the breakpoint, and let all threads that are
4912 supposed to be running, run again. */
4915 start_step_over (struct lwp_info
*lwp
)
4917 struct thread_info
*thread
= get_lwp_thread (lwp
);
4918 struct thread_info
*saved_thread
;
4923 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4926 stop_all_lwps (1, lwp
);
4928 if (lwp
->suspended
!= 0)
4930 internal_error (__FILE__
, __LINE__
,
4931 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4936 debug_printf ("Done stopping all threads for step-over.\n");
4938 /* Note, we should always reach here with an already adjusted PC,
4939 either by GDB (if we're resuming due to GDB's request), or by our
4940 caller, if we just finished handling an internal breakpoint GDB
4941 shouldn't care about. */
4944 saved_thread
= current_thread
;
4945 current_thread
= thread
;
4947 lwp
->bp_reinsert
= pc
;
4948 uninsert_breakpoints_at (pc
);
4949 uninsert_fast_tracepoint_jumps_at (pc
);
4951 step
= single_step (lwp
);
4953 current_thread
= saved_thread
;
4955 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4957 /* Require next event from this LWP. */
4958 step_over_bkpt
= thread
->id
;
4962 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4963 start_step_over, if still there, and delete any single-step
4964 breakpoints we've set, on non hardware single-step targets. */
4967 finish_step_over (struct lwp_info
*lwp
)
4969 if (lwp
->bp_reinsert
!= 0)
4971 struct thread_info
*saved_thread
= current_thread
;
4974 debug_printf ("Finished step over.\n");
4976 current_thread
= get_lwp_thread (lwp
);
4978 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4979 may be no breakpoint to reinsert there by now. */
4980 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4981 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4983 lwp
->bp_reinsert
= 0;
4985 /* Delete any single-step breakpoints. No longer needed. We
4986 don't have to worry about other threads hitting this trap,
4987 and later not being able to explain it, because we were
4988 stepping over a breakpoint, and we hold all threads but
4989 LWP stopped while doing that. */
4990 if (!can_hardware_single_step ())
4992 gdb_assert (has_single_step_breakpoints (current_thread
));
4993 delete_single_step_breakpoints (current_thread
);
4996 step_over_bkpt
= null_ptid
;
4997 current_thread
= saved_thread
;
5004 /* If there's a step over in progress, wait until all threads stop
5005 (that is, until the stepping thread finishes its step), and
5006 unsuspend all lwps. The stepping thread ends with its status
5007 pending, which is processed later when we get back to processing
5011 complete_ongoing_step_over (void)
5013 if (!ptid_equal (step_over_bkpt
, null_ptid
))
5015 struct lwp_info
*lwp
;
5020 debug_printf ("detach: step over in progress, finish it first\n");
5022 /* Passing NULL_PTID as filter indicates we want all events to
5023 be left pending. Eventually this returns when there are no
5024 unwaited-for children left. */
5025 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
5027 gdb_assert (ret
== -1);
5029 lwp
= find_lwp_pid (step_over_bkpt
);
5031 finish_step_over (lwp
);
5032 step_over_bkpt
= null_ptid
;
5033 unsuspend_all_lwps (lwp
);
5037 /* This function is called once per thread. We check the thread's resume
5038 request, which will tell us whether to resume, step, or leave the thread
5039 stopped; and what signal, if any, it should be sent.
5041 For threads which we aren't explicitly told otherwise, we preserve
5042 the stepping flag; this is used for stepping over gdbserver-placed
5045 If pending_flags was set in any thread, we queue any needed
5046 signals, since we won't actually resume. We already have a pending
5047 event to report, so we don't need to preserve any step requests;
5048 they should be re-issued if necessary. */
5051 linux_resume_one_thread (thread_info
*thread
, void *arg
)
5053 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5054 int leave_all_stopped
= * (int *) arg
;
5057 if (lwp
->resume
== NULL
)
5060 if (lwp
->resume
->kind
== resume_stop
)
5063 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
5068 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
5070 /* Stop the thread, and wait for the event asynchronously,
5071 through the event loop. */
5077 debug_printf ("already stopped LWP %ld\n",
5080 /* The LWP may have been stopped in an internal event that
5081 was not meant to be notified back to GDB (e.g., gdbserver
5082 breakpoint), so we should be reporting a stop event in
5085 /* If the thread already has a pending SIGSTOP, this is a
5086 no-op. Otherwise, something later will presumably resume
5087 the thread and this will cause it to cancel any pending
5088 operation, due to last_resume_kind == resume_stop. If
5089 the thread already has a pending status to report, we
5090 will still report it the next time we wait - see
5091 status_pending_p_callback. */
5093 /* If we already have a pending signal to report, then
5094 there's no need to queue a SIGSTOP, as this means we're
5095 midway through moving the LWP out of the jumppad, and we
5096 will report the pending signal as soon as that is
5098 if (lwp
->pending_signals_to_report
== NULL
)
5102 /* For stop requests, we're done. */
5104 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5108 /* If this thread which is about to be resumed has a pending status,
5109 then don't resume it - we can just report the pending status.
5110 Likewise if it is suspended, because e.g., another thread is
5111 stepping past a breakpoint. Make sure to queue any signals that
5112 would otherwise be sent. In all-stop mode, we do this decision
5113 based on if *any* thread has a pending status. If there's a
5114 thread that needs the step-over-breakpoint dance, then don't
5115 resume any other thread but that particular one. */
5116 leave_pending
= (lwp
->suspended
5117 || lwp
->status_pending_p
5118 || leave_all_stopped
);
5120 /* If we have a new signal, enqueue the signal. */
5121 if (lwp
->resume
->sig
!= 0)
5123 siginfo_t info
, *info_p
;
5125 /* If this is the same signal we were previously stopped by,
5126 make sure to queue its siginfo. */
5127 if (WIFSTOPPED (lwp
->last_status
)
5128 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
5129 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
5130 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
5135 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
5141 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
5143 proceed_one_lwp (thread
, NULL
);
5148 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5151 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5157 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5159 struct thread_resume_array array
= { resume_info
, n
};
5160 struct thread_info
*need_step_over
= NULL
;
5162 int leave_all_stopped
;
5167 debug_printf ("linux_resume:\n");
5170 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
5172 /* If there is a thread which would otherwise be resumed, which has
5173 a pending status, then don't resume any threads - we can just
5174 report the pending status. Make sure to queue any signals that
5175 would otherwise be sent. In non-stop mode, we'll apply this
5176 logic to each thread individually. We consume all pending events
5177 before considering to start a step-over (in all-stop). */
5180 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
5182 /* If there is a thread which would otherwise be resumed, which is
5183 stopped at a breakpoint that needs stepping over, then don't
5184 resume any threads - have it step over the breakpoint with all
5185 other threads stopped, then resume all threads again. Make sure
5186 to queue any signals that would otherwise be delivered or
5188 if (!any_pending
&& supports_breakpoints ())
5190 = (struct thread_info
*) find_inferior (&all_threads
,
5191 need_step_over_p
, NULL
);
5193 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5197 if (need_step_over
!= NULL
)
5198 debug_printf ("Not resuming all, need step over\n");
5199 else if (any_pending
)
5200 debug_printf ("Not resuming, all-stop and found "
5201 "an LWP with pending status\n");
5203 debug_printf ("Resuming, no pending status or step over needed\n");
5206 /* Even if we're leaving threads stopped, queue all signals we'd
5207 otherwise deliver. */
5208 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
5211 start_step_over (get_thread_lwp (need_step_over
));
5215 debug_printf ("linux_resume done\n");
5219 /* We may have events that were pending that can/should be sent to
5220 the client now. Trigger a linux_wait call. */
5221 if (target_is_async_p ())
5225 /* This function is called once per thread. We check the thread's
5226 last resume request, which will tell us whether to resume, step, or
5227 leave the thread stopped. Any signal the client requested to be
5228 delivered has already been enqueued at this point.
5230 If any thread that GDB wants running is stopped at an internal
5231 breakpoint that needs stepping over, we start a step-over operation
5232 on that particular thread, and leave all others stopped. */
5235 proceed_one_lwp (thread_info
*thread
, void *except
)
5237 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5244 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5249 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5253 if (thread
->last_resume_kind
== resume_stop
5254 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5257 debug_printf (" client wants LWP to remain %ld stopped\n",
5262 if (lwp
->status_pending_p
)
5265 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5270 gdb_assert (lwp
->suspended
>= 0);
5275 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5279 if (thread
->last_resume_kind
== resume_stop
5280 && lwp
->pending_signals_to_report
== NULL
5281 && (lwp
->collecting_fast_tracepoint
5282 == fast_tpoint_collect_result::not_collecting
))
5284 /* We haven't reported this LWP as stopped yet (otherwise, the
5285 last_status.kind check above would catch it, and we wouldn't
5286 reach here. This LWP may have been momentarily paused by a
5287 stop_all_lwps call while handling for example, another LWP's
5288 step-over. In that case, the pending expected SIGSTOP signal
5289 that was queued at vCont;t handling time will have already
5290 been consumed by wait_for_sigstop, and so we need to requeue
5291 another one here. Note that if the LWP already has a SIGSTOP
5292 pending, this is a no-op. */
5295 debug_printf ("Client wants LWP %ld to stop. "
5296 "Making sure it has a SIGSTOP pending\n",
5302 if (thread
->last_resume_kind
== resume_step
)
5305 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5308 /* If resume_step is requested by GDB, install single-step
5309 breakpoints when the thread is about to be actually resumed if
5310 the single-step breakpoints weren't removed. */
5311 if (can_software_single_step ()
5312 && !has_single_step_breakpoints (thread
))
5313 install_software_single_step_breakpoints (lwp
);
5315 step
= maybe_hw_step (thread
);
5317 else if (lwp
->bp_reinsert
!= 0)
5320 debug_printf (" stepping LWP %ld, reinsert set\n",
5323 step
= maybe_hw_step (thread
);
5328 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5333 unsuspend_and_proceed_one_lwp (thread_info
*thread
, void *except
)
5335 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5340 lwp_suspended_decr (lwp
);
5342 return proceed_one_lwp (thread
, except
);
5345 /* When we finish a step-over, set threads running again. If there's
5346 another thread that may need a step-over, now's the time to start
5347 it. Eventually, we'll move all threads past their breakpoints. */
5350 proceed_all_lwps (void)
5352 struct thread_info
*need_step_over
;
5354 /* If there is a thread which would otherwise be resumed, which is
5355 stopped at a breakpoint that needs stepping over, then don't
5356 resume any threads - have it step over the breakpoint with all
5357 other threads stopped, then resume all threads again. */
5359 if (supports_breakpoints ())
5362 = (struct thread_info
*) find_inferior (&all_threads
,
5363 need_step_over_p
, NULL
);
5365 if (need_step_over
!= NULL
)
5368 debug_printf ("proceed_all_lwps: found "
5369 "thread %ld needing a step-over\n",
5370 lwpid_of (need_step_over
));
5372 start_step_over (get_thread_lwp (need_step_over
));
5378 debug_printf ("Proceeding, no step-over needed\n");
5380 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
5383 /* Stopped LWPs that the client wanted to be running, that don't have
5384 pending statuses, are set to run again, except for EXCEPT, if not
5385 NULL. This undoes a stop_all_lwps call. */
5388 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5394 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5395 lwpid_of (get_lwp_thread (except
)));
5397 debug_printf ("unstopping all lwps\n");
5401 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
5403 find_inferior (&all_threads
, proceed_one_lwp
, except
);
5407 debug_printf ("unstop_all_lwps done\n");
5413 #ifdef HAVE_LINUX_REGSETS
5415 #define use_linux_regsets 1
5417 /* Returns true if REGSET has been disabled. */
5420 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5422 return (info
->disabled_regsets
!= NULL
5423 && info
->disabled_regsets
[regset
- info
->regsets
]);
5426 /* Disable REGSET. */
5429 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5433 dr_offset
= regset
- info
->regsets
;
5434 if (info
->disabled_regsets
== NULL
)
5435 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5436 info
->disabled_regsets
[dr_offset
] = 1;
5440 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5441 struct regcache
*regcache
)
5443 struct regset_info
*regset
;
5444 int saw_general_regs
= 0;
5448 pid
= lwpid_of (current_thread
);
5449 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5454 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5457 buf
= xmalloc (regset
->size
);
5459 nt_type
= regset
->nt_type
;
5463 iov
.iov_len
= regset
->size
;
5464 data
= (void *) &iov
;
5470 res
= ptrace (regset
->get_request
, pid
,
5471 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5473 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5479 /* If we get EIO on a regset, do not try it again for
5480 this process mode. */
5481 disable_regset (regsets_info
, regset
);
5483 else if (errno
== ENODATA
)
5485 /* ENODATA may be returned if the regset is currently
5486 not "active". This can happen in normal operation,
5487 so suppress the warning in this case. */
5489 else if (errno
== ESRCH
)
5491 /* At this point, ESRCH should mean the process is
5492 already gone, in which case we simply ignore attempts
5493 to read its registers. */
5498 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5505 if (regset
->type
== GENERAL_REGS
)
5506 saw_general_regs
= 1;
5507 regset
->store_function (regcache
, buf
);
5511 if (saw_general_regs
)
5518 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5519 struct regcache
*regcache
)
5521 struct regset_info
*regset
;
5522 int saw_general_regs
= 0;
5526 pid
= lwpid_of (current_thread
);
5527 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5532 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5533 || regset
->fill_function
== NULL
)
5536 buf
= xmalloc (regset
->size
);
5538 /* First fill the buffer with the current register set contents,
5539 in case there are any items in the kernel's regset that are
5540 not in gdbserver's regcache. */
5542 nt_type
= regset
->nt_type
;
5546 iov
.iov_len
= regset
->size
;
5547 data
= (void *) &iov
;
5553 res
= ptrace (regset
->get_request
, pid
,
5554 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5556 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5561 /* Then overlay our cached registers on that. */
5562 regset
->fill_function (regcache
, buf
);
5564 /* Only now do we write the register set. */
5566 res
= ptrace (regset
->set_request
, pid
,
5567 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5569 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5577 /* If we get EIO on a regset, do not try it again for
5578 this process mode. */
5579 disable_regset (regsets_info
, regset
);
5581 else if (errno
== ESRCH
)
5583 /* At this point, ESRCH should mean the process is
5584 already gone, in which case we simply ignore attempts
5585 to change its registers. See also the related
5586 comment in linux_resume_one_lwp. */
5592 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5595 else if (regset
->type
== GENERAL_REGS
)
5596 saw_general_regs
= 1;
5599 if (saw_general_regs
)
5605 #else /* !HAVE_LINUX_REGSETS */
5607 #define use_linux_regsets 0
5608 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5609 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5613 /* Return 1 if register REGNO is supported by one of the regset ptrace
5614 calls or 0 if it has to be transferred individually. */
5617 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5619 unsigned char mask
= 1 << (regno
% 8);
5620 size_t index
= regno
/ 8;
5622 return (use_linux_regsets
5623 && (regs_info
->regset_bitmap
== NULL
5624 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5627 #ifdef HAVE_LINUX_USRREGS
5630 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5634 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5635 error ("Invalid register number %d.", regnum
);
5637 addr
= usrregs
->regmap
[regnum
];
5642 /* Fetch one register. */
5644 fetch_register (const struct usrregs_info
*usrregs
,
5645 struct regcache
*regcache
, int regno
)
5652 if (regno
>= usrregs
->num_regs
)
5654 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5657 regaddr
= register_addr (usrregs
, regno
);
5661 size
= ((register_size (regcache
->tdesc
, regno
)
5662 + sizeof (PTRACE_XFER_TYPE
) - 1)
5663 & -sizeof (PTRACE_XFER_TYPE
));
5664 buf
= (char *) alloca (size
);
5666 pid
= lwpid_of (current_thread
);
5667 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5670 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5671 ptrace (PTRACE_PEEKUSER
, pid
,
5672 /* Coerce to a uintptr_t first to avoid potential gcc warning
5673 of coercing an 8 byte integer to a 4 byte pointer. */
5674 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5675 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5677 error ("reading register %d: %s", regno
, strerror (errno
));
5680 if (the_low_target
.supply_ptrace_register
)
5681 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5683 supply_register (regcache
, regno
, buf
);
5686 /* Store one register. */
5688 store_register (const struct usrregs_info
*usrregs
,
5689 struct regcache
*regcache
, int regno
)
5696 if (regno
>= usrregs
->num_regs
)
5698 if ((*the_low_target
.cannot_store_register
) (regno
))
5701 regaddr
= register_addr (usrregs
, regno
);
5705 size
= ((register_size (regcache
->tdesc
, regno
)
5706 + sizeof (PTRACE_XFER_TYPE
) - 1)
5707 & -sizeof (PTRACE_XFER_TYPE
));
5708 buf
= (char *) alloca (size
);
5709 memset (buf
, 0, size
);
5711 if (the_low_target
.collect_ptrace_register
)
5712 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5714 collect_register (regcache
, regno
, buf
);
5716 pid
= lwpid_of (current_thread
);
5717 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5720 ptrace (PTRACE_POKEUSER
, pid
,
5721 /* Coerce to a uintptr_t first to avoid potential gcc warning
5722 about coercing an 8 byte integer to a 4 byte pointer. */
5723 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5724 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5727 /* At this point, ESRCH should mean the process is
5728 already gone, in which case we simply ignore attempts
5729 to change its registers. See also the related
5730 comment in linux_resume_one_lwp. */
5734 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5735 error ("writing register %d: %s", regno
, strerror (errno
));
5737 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5741 /* Fetch all registers, or just one, from the child process.
5742 If REGNO is -1, do this for all registers, skipping any that are
5743 assumed to have been retrieved by regsets_fetch_inferior_registers,
5744 unless ALL is non-zero.
5745 Otherwise, REGNO specifies which register (so we can save time). */
5747 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5748 struct regcache
*regcache
, int regno
, int all
)
5750 struct usrregs_info
*usr
= regs_info
->usrregs
;
5754 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5755 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5756 fetch_register (usr
, regcache
, regno
);
5759 fetch_register (usr
, regcache
, regno
);
5762 /* Store our register values back into the inferior.
5763 If REGNO is -1, do this for all registers, skipping any that are
5764 assumed to have been saved by regsets_store_inferior_registers,
5765 unless ALL is non-zero.
5766 Otherwise, REGNO specifies which register (so we can save time). */
5768 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5769 struct regcache
*regcache
, int regno
, int all
)
5771 struct usrregs_info
*usr
= regs_info
->usrregs
;
5775 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5776 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5777 store_register (usr
, regcache
, regno
);
5780 store_register (usr
, regcache
, regno
);
5783 #else /* !HAVE_LINUX_USRREGS */
5785 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5786 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5792 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5796 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5800 if (the_low_target
.fetch_register
!= NULL
5801 && regs_info
->usrregs
!= NULL
)
5802 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5803 (*the_low_target
.fetch_register
) (regcache
, regno
);
5805 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5806 if (regs_info
->usrregs
!= NULL
)
5807 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5811 if (the_low_target
.fetch_register
!= NULL
5812 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5815 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5817 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5819 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5820 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5825 linux_store_registers (struct regcache
*regcache
, int regno
)
5829 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5833 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5835 if (regs_info
->usrregs
!= NULL
)
5836 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5840 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5842 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5844 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5845 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5850 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5851 to debugger memory starting at MYADDR. */
5854 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5856 int pid
= lwpid_of (current_thread
);
5857 PTRACE_XFER_TYPE
*buffer
;
5865 /* Try using /proc. Don't bother for one word. */
5866 if (len
>= 3 * sizeof (long))
5870 /* We could keep this file open and cache it - possibly one per
5871 thread. That requires some juggling, but is even faster. */
5872 sprintf (filename
, "/proc/%d/mem", pid
);
5873 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5877 /* If pread64 is available, use it. It's faster if the kernel
5878 supports it (only one syscall), and it's 64-bit safe even on
5879 32-bit platforms (for instance, SPARC debugging a SPARC64
5882 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5885 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5886 bytes
= read (fd
, myaddr
, len
);
5893 /* Some data was read, we'll try to get the rest with ptrace. */
5903 /* Round starting address down to longword boundary. */
5904 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5905 /* Round ending address up; get number of longwords that makes. */
5906 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5907 / sizeof (PTRACE_XFER_TYPE
));
5908 /* Allocate buffer of that many longwords. */
5909 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5911 /* Read all the longwords */
5913 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5915 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5916 about coercing an 8 byte integer to a 4 byte pointer. */
5917 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5918 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5919 (PTRACE_TYPE_ARG4
) 0);
5925 /* Copy appropriate bytes out of the buffer. */
5928 i
*= sizeof (PTRACE_XFER_TYPE
);
5929 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5931 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5938 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5939 memory at MEMADDR. On failure (cannot write to the inferior)
5940 returns the value of errno. Always succeeds if LEN is zero. */
5943 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5946 /* Round starting address down to longword boundary. */
5947 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5948 /* Round ending address up; get number of longwords that makes. */
5950 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5951 / sizeof (PTRACE_XFER_TYPE
);
5953 /* Allocate buffer of that many longwords. */
5954 PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5956 int pid
= lwpid_of (current_thread
);
5960 /* Zero length write always succeeds. */
5966 /* Dump up to four bytes. */
5967 char str
[4 * 2 + 1];
5969 int dump
= len
< 4 ? len
: 4;
5971 for (i
= 0; i
< dump
; i
++)
5973 sprintf (p
, "%02x", myaddr
[i
]);
5978 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5979 str
, (long) memaddr
, pid
);
5982 /* Fill start and end extra bytes of buffer with existing memory data. */
5985 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5986 about coercing an 8 byte integer to a 4 byte pointer. */
5987 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5988 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5989 (PTRACE_TYPE_ARG4
) 0);
5997 = ptrace (PTRACE_PEEKTEXT
, pid
,
5998 /* Coerce to a uintptr_t first to avoid potential gcc warning
5999 about coercing an 8 byte integer to a 4 byte pointer. */
6000 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
6001 * sizeof (PTRACE_XFER_TYPE
)),
6002 (PTRACE_TYPE_ARG4
) 0);
6007 /* Copy data to be written over corresponding part of buffer. */
6009 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
6012 /* Write the entire buffer. */
6014 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
6017 ptrace (PTRACE_POKETEXT
, pid
,
6018 /* Coerce to a uintptr_t first to avoid potential gcc warning
6019 about coercing an 8 byte integer to a 4 byte pointer. */
6020 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
6021 (PTRACE_TYPE_ARG4
) buffer
[i
]);
6030 linux_look_up_symbols (void)
6032 #ifdef USE_THREAD_DB
6033 struct process_info
*proc
= current_process ();
6035 if (proc
->priv
->thread_db
!= NULL
)
6043 linux_request_interrupt (void)
6045 /* Send a SIGINT to the process group. This acts just like the user
6046 typed a ^C on the controlling terminal. */
6047 kill (-signal_pid
, SIGINT
);
6050 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
6051 to debugger memory starting at MYADDR. */
6054 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
6056 char filename
[PATH_MAX
];
6058 int pid
= lwpid_of (current_thread
);
6060 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6062 fd
= open (filename
, O_RDONLY
);
6066 if (offset
!= (CORE_ADDR
) 0
6067 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6070 n
= read (fd
, myaddr
, len
);
6077 /* These breakpoint and watchpoint related wrapper functions simply
6078 pass on the function call if the target has registered a
6079 corresponding function. */
6082 linux_supports_z_point_type (char z_type
)
6084 return (the_low_target
.supports_z_point_type
!= NULL
6085 && the_low_target
.supports_z_point_type (z_type
));
6089 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6090 int size
, struct raw_breakpoint
*bp
)
6092 if (type
== raw_bkpt_type_sw
)
6093 return insert_memory_breakpoint (bp
);
6094 else if (the_low_target
.insert_point
!= NULL
)
6095 return the_low_target
.insert_point (type
, addr
, size
, bp
);
6097 /* Unsupported (see target.h). */
6102 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6103 int size
, struct raw_breakpoint
*bp
)
6105 if (type
== raw_bkpt_type_sw
)
6106 return remove_memory_breakpoint (bp
);
6107 else if (the_low_target
.remove_point
!= NULL
)
6108 return the_low_target
.remove_point (type
, addr
, size
, bp
);
6110 /* Unsupported (see target.h). */
6114 /* Implement the to_stopped_by_sw_breakpoint target_ops
6118 linux_stopped_by_sw_breakpoint (void)
6120 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6122 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
6125 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
6129 linux_supports_stopped_by_sw_breakpoint (void)
6131 return USE_SIGTRAP_SIGINFO
;
6134 /* Implement the to_stopped_by_hw_breakpoint target_ops
6138 linux_stopped_by_hw_breakpoint (void)
6140 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6142 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6145 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6149 linux_supports_stopped_by_hw_breakpoint (void)
6151 return USE_SIGTRAP_SIGINFO
;
6154 /* Implement the supports_hardware_single_step target_ops method. */
6157 linux_supports_hardware_single_step (void)
6159 return can_hardware_single_step ();
6163 linux_supports_software_single_step (void)
6165 return can_software_single_step ();
6169 linux_stopped_by_watchpoint (void)
6171 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6173 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6177 linux_stopped_data_address (void)
6179 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6181 return lwp
->stopped_data_address
;
6184 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6185 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6186 && defined(PT_TEXT_END_ADDR)
6188 /* This is only used for targets that define PT_TEXT_ADDR,
6189 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6190 the target has different ways of acquiring this information, like
6193 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6194 to tell gdb about. */
6197 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6199 unsigned long text
, text_end
, data
;
6200 int pid
= lwpid_of (current_thread
);
6204 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6205 (PTRACE_TYPE_ARG4
) 0);
6206 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6207 (PTRACE_TYPE_ARG4
) 0);
6208 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6209 (PTRACE_TYPE_ARG4
) 0);
6213 /* Both text and data offsets produced at compile-time (and so
6214 used by gdb) are relative to the beginning of the program,
6215 with the data segment immediately following the text segment.
6216 However, the actual runtime layout in memory may put the data
6217 somewhere else, so when we send gdb a data base-address, we
6218 use the real data base address and subtract the compile-time
6219 data base-address from it (which is just the length of the
6220 text segment). BSS immediately follows data in both
6223 *data_p
= data
- (text_end
- text
);
6232 linux_qxfer_osdata (const char *annex
,
6233 unsigned char *readbuf
, unsigned const char *writebuf
,
6234 CORE_ADDR offset
, int len
)
6236 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6239 /* Convert a native/host siginfo object, into/from the siginfo in the
6240 layout of the inferiors' architecture. */
6243 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6247 if (the_low_target
.siginfo_fixup
!= NULL
)
6248 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6250 /* If there was no callback, or the callback didn't do anything,
6251 then just do a straight memcpy. */
6255 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6257 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6262 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6263 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6267 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6269 if (current_thread
== NULL
)
6272 pid
= lwpid_of (current_thread
);
6275 debug_printf ("%s siginfo for lwp %d.\n",
6276 readbuf
!= NULL
? "Reading" : "Writing",
6279 if (offset
>= sizeof (siginfo
))
6282 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6285 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6286 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6287 inferior with a 64-bit GDBSERVER should look the same as debugging it
6288 with a 32-bit GDBSERVER, we need to convert it. */
6289 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6291 if (offset
+ len
> sizeof (siginfo
))
6292 len
= sizeof (siginfo
) - offset
;
6294 if (readbuf
!= NULL
)
6295 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6298 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6300 /* Convert back to ptrace layout before flushing it out. */
6301 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6303 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6310 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6311 so we notice when children change state; as the handler for the
6312 sigsuspend in my_waitpid. */
6315 sigchld_handler (int signo
)
6317 int old_errno
= errno
;
6323 /* fprintf is not async-signal-safe, so call write
6325 if (write (2, "sigchld_handler\n",
6326 sizeof ("sigchld_handler\n") - 1) < 0)
6327 break; /* just ignore */
6331 if (target_is_async_p ())
6332 async_file_mark (); /* trigger a linux_wait */
6338 linux_supports_non_stop (void)
6344 linux_async (int enable
)
6346 int previous
= target_is_async_p ();
6349 debug_printf ("linux_async (%d), previous=%d\n",
6352 if (previous
!= enable
)
6355 sigemptyset (&mask
);
6356 sigaddset (&mask
, SIGCHLD
);
6358 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6362 if (pipe (linux_event_pipe
) == -1)
6364 linux_event_pipe
[0] = -1;
6365 linux_event_pipe
[1] = -1;
6366 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6368 warning ("creating event pipe failed.");
6372 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6373 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6375 /* Register the event loop handler. */
6376 add_file_handler (linux_event_pipe
[0],
6377 handle_target_event
, NULL
);
6379 /* Always trigger a linux_wait. */
6384 delete_file_handler (linux_event_pipe
[0]);
6386 close (linux_event_pipe
[0]);
6387 close (linux_event_pipe
[1]);
6388 linux_event_pipe
[0] = -1;
6389 linux_event_pipe
[1] = -1;
6392 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6399 linux_start_non_stop (int nonstop
)
6401 /* Register or unregister from event-loop accordingly. */
6402 linux_async (nonstop
);
6404 if (target_is_async_p () != (nonstop
!= 0))
6411 linux_supports_multi_process (void)
6416 /* Check if fork events are supported. */
6419 linux_supports_fork_events (void)
6421 return linux_supports_tracefork ();
6424 /* Check if vfork events are supported. */
6427 linux_supports_vfork_events (void)
6429 return linux_supports_tracefork ();
6432 /* Check if exec events are supported. */
6435 linux_supports_exec_events (void)
6437 return linux_supports_traceexec ();
6440 /* Callback for 'find_inferior'. Set the (possibly changed) ptrace
6441 options for the specified lwp. */
6444 reset_lwp_ptrace_options_callback (thread_info
*thread
, void *args
)
6446 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6450 /* Stop the lwp so we can modify its ptrace options. */
6451 lwp
->must_set_ptrace_flags
= 1;
6452 linux_stop_lwp (lwp
);
6456 /* Already stopped; go ahead and set the ptrace options. */
6457 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6458 int options
= linux_low_ptrace_options (proc
->attached
);
6460 linux_enable_event_reporting (lwpid_of (thread
), options
);
6461 lwp
->must_set_ptrace_flags
= 0;
6467 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6468 ptrace flags for all inferiors. This is in case the new GDB connection
6469 doesn't support the same set of events that the previous one did. */
6472 linux_handle_new_gdb_connection (void)
6476 /* Request that all the lwps reset their ptrace options. */
6477 find_inferior (&all_threads
, reset_lwp_ptrace_options_callback
, &pid
);
6481 linux_supports_disable_randomization (void)
6483 #ifdef HAVE_PERSONALITY
6491 linux_supports_agent (void)
6497 linux_supports_range_stepping (void)
6499 if (can_software_single_step ())
6501 if (*the_low_target
.supports_range_stepping
== NULL
)
6504 return (*the_low_target
.supports_range_stepping
) ();
6507 /* Enumerate spufs IDs for process PID. */
6509 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6515 struct dirent
*entry
;
6517 sprintf (path
, "/proc/%ld/fd", pid
);
6518 dir
= opendir (path
);
6523 while ((entry
= readdir (dir
)) != NULL
)
6529 fd
= atoi (entry
->d_name
);
6533 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6534 if (stat (path
, &st
) != 0)
6536 if (!S_ISDIR (st
.st_mode
))
6539 if (statfs (path
, &stfs
) != 0)
6541 if (stfs
.f_type
!= SPUFS_MAGIC
)
6544 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6546 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6556 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6557 object type, using the /proc file system. */
6559 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6560 unsigned const char *writebuf
,
6561 CORE_ADDR offset
, int len
)
6563 long pid
= lwpid_of (current_thread
);
6568 if (!writebuf
&& !readbuf
)
6576 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6579 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6580 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6585 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6592 ret
= write (fd
, writebuf
, (size_t) len
);
6594 ret
= read (fd
, readbuf
, (size_t) len
);
6600 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6601 struct target_loadseg
6603 /* Core address to which the segment is mapped. */
6605 /* VMA recorded in the program header. */
6607 /* Size of this segment in memory. */
6611 # if defined PT_GETDSBT
6612 struct target_loadmap
6614 /* Protocol version number, must be zero. */
6616 /* Pointer to the DSBT table, its size, and the DSBT index. */
6617 unsigned *dsbt_table
;
6618 unsigned dsbt_size
, dsbt_index
;
6619 /* Number of segments in this map. */
6621 /* The actual memory map. */
6622 struct target_loadseg segs
[/*nsegs*/];
6624 # define LINUX_LOADMAP PT_GETDSBT
6625 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6626 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6628 struct target_loadmap
6630 /* Protocol version number, must be zero. */
6632 /* Number of segments in this map. */
6634 /* The actual memory map. */
6635 struct target_loadseg segs
[/*nsegs*/];
6637 # define LINUX_LOADMAP PTRACE_GETFDPIC
6638 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6639 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6643 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6644 unsigned char *myaddr
, unsigned int len
)
6646 int pid
= lwpid_of (current_thread
);
6648 struct target_loadmap
*data
= NULL
;
6649 unsigned int actual_length
, copy_length
;
6651 if (strcmp (annex
, "exec") == 0)
6652 addr
= (int) LINUX_LOADMAP_EXEC
;
6653 else if (strcmp (annex
, "interp") == 0)
6654 addr
= (int) LINUX_LOADMAP_INTERP
;
6658 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6664 actual_length
= sizeof (struct target_loadmap
)
6665 + sizeof (struct target_loadseg
) * data
->nsegs
;
6667 if (offset
< 0 || offset
> actual_length
)
6670 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6671 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6675 # define linux_read_loadmap NULL
6676 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6679 linux_process_qsupported (char **features
, int count
)
6681 if (the_low_target
.process_qsupported
!= NULL
)
6682 the_low_target
.process_qsupported (features
, count
);
6686 linux_supports_catch_syscall (void)
6688 return (the_low_target
.get_syscall_trapinfo
!= NULL
6689 && linux_supports_tracesysgood ());
6693 linux_get_ipa_tdesc_idx (void)
6695 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6698 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6702 linux_supports_tracepoints (void)
6704 if (*the_low_target
.supports_tracepoints
== NULL
)
6707 return (*the_low_target
.supports_tracepoints
) ();
6711 linux_read_pc (struct regcache
*regcache
)
6713 if (the_low_target
.get_pc
== NULL
)
6716 return (*the_low_target
.get_pc
) (regcache
);
6720 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6722 gdb_assert (the_low_target
.set_pc
!= NULL
);
6724 (*the_low_target
.set_pc
) (regcache
, pc
);
6728 linux_thread_stopped (struct thread_info
*thread
)
6730 return get_thread_lwp (thread
)->stopped
;
6733 /* This exposes stop-all-threads functionality to other modules. */
6736 linux_pause_all (int freeze
)
6738 stop_all_lwps (freeze
, NULL
);
6741 /* This exposes unstop-all-threads functionality to other gdbserver
6745 linux_unpause_all (int unfreeze
)
6747 unstop_all_lwps (unfreeze
, NULL
);
6751 linux_prepare_to_access_memory (void)
6753 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6756 linux_pause_all (1);
6761 linux_done_accessing_memory (void)
6763 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6766 linux_unpause_all (1);
6770 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6771 CORE_ADDR collector
,
6774 CORE_ADDR
*jump_entry
,
6775 CORE_ADDR
*trampoline
,
6776 ULONGEST
*trampoline_size
,
6777 unsigned char *jjump_pad_insn
,
6778 ULONGEST
*jjump_pad_insn_size
,
6779 CORE_ADDR
*adjusted_insn_addr
,
6780 CORE_ADDR
*adjusted_insn_addr_end
,
6783 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6784 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6785 jump_entry
, trampoline
, trampoline_size
,
6786 jjump_pad_insn
, jjump_pad_insn_size
,
6787 adjusted_insn_addr
, adjusted_insn_addr_end
,
6791 static struct emit_ops
*
6792 linux_emit_ops (void)
6794 if (the_low_target
.emit_ops
!= NULL
)
6795 return (*the_low_target
.emit_ops
) ();
6801 linux_get_min_fast_tracepoint_insn_len (void)
6803 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6806 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6809 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6810 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6812 char filename
[PATH_MAX
];
6814 const int auxv_size
= is_elf64
6815 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6816 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6818 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6820 fd
= open (filename
, O_RDONLY
);
6826 while (read (fd
, buf
, auxv_size
) == auxv_size
6827 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6831 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6833 switch (aux
->a_type
)
6836 *phdr_memaddr
= aux
->a_un
.a_val
;
6839 *num_phdr
= aux
->a_un
.a_val
;
6845 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6847 switch (aux
->a_type
)
6850 *phdr_memaddr
= aux
->a_un
.a_val
;
6853 *num_phdr
= aux
->a_un
.a_val
;
6861 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6863 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6864 "phdr_memaddr = %ld, phdr_num = %d",
6865 (long) *phdr_memaddr
, *num_phdr
);
6872 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6875 get_dynamic (const int pid
, const int is_elf64
)
6877 CORE_ADDR phdr_memaddr
, relocation
;
6879 unsigned char *phdr_buf
;
6880 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6882 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6885 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6886 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6888 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6891 /* Compute relocation: it is expected to be 0 for "regular" executables,
6892 non-zero for PIE ones. */
6894 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6897 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6899 if (p
->p_type
== PT_PHDR
)
6900 relocation
= phdr_memaddr
- p
->p_vaddr
;
6904 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6906 if (p
->p_type
== PT_PHDR
)
6907 relocation
= phdr_memaddr
- p
->p_vaddr
;
6910 if (relocation
== -1)
6912 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6913 any real world executables, including PIE executables, have always
6914 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6915 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6916 or present DT_DEBUG anyway (fpc binaries are statically linked).
6918 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6920 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6925 for (i
= 0; i
< num_phdr
; i
++)
6929 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6931 if (p
->p_type
== PT_DYNAMIC
)
6932 return p
->p_vaddr
+ relocation
;
6936 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6938 if (p
->p_type
== PT_DYNAMIC
)
6939 return p
->p_vaddr
+ relocation
;
6946 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6947 can be 0 if the inferior does not yet have the library list initialized.
6948 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6949 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6952 get_r_debug (const int pid
, const int is_elf64
)
6954 CORE_ADDR dynamic_memaddr
;
6955 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6956 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6959 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6960 if (dynamic_memaddr
== 0)
6963 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6967 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6968 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6972 unsigned char buf
[sizeof (Elf64_Xword
)];
6976 #ifdef DT_MIPS_RLD_MAP
6977 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6979 if (linux_read_memory (dyn
->d_un
.d_val
,
6980 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6985 #endif /* DT_MIPS_RLD_MAP */
6986 #ifdef DT_MIPS_RLD_MAP_REL
6987 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6989 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6990 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6995 #endif /* DT_MIPS_RLD_MAP_REL */
6997 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6998 map
= dyn
->d_un
.d_val
;
7000 if (dyn
->d_tag
== DT_NULL
)
7005 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
7006 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
7010 unsigned char buf
[sizeof (Elf32_Word
)];
7014 #ifdef DT_MIPS_RLD_MAP
7015 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
7017 if (linux_read_memory (dyn
->d_un
.d_val
,
7018 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7023 #endif /* DT_MIPS_RLD_MAP */
7024 #ifdef DT_MIPS_RLD_MAP_REL
7025 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
7027 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
7028 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7033 #endif /* DT_MIPS_RLD_MAP_REL */
7035 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
7036 map
= dyn
->d_un
.d_val
;
7038 if (dyn
->d_tag
== DT_NULL
)
7042 dynamic_memaddr
+= dyn_size
;
7048 /* Read one pointer from MEMADDR in the inferior. */
7051 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
7055 /* Go through a union so this works on either big or little endian
7056 hosts, when the inferior's pointer size is smaller than the size
7057 of CORE_ADDR. It is assumed the inferior's endianness is the
7058 same of the superior's. */
7061 CORE_ADDR core_addr
;
7066 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
7069 if (ptr_size
== sizeof (CORE_ADDR
))
7070 *ptr
= addr
.core_addr
;
7071 else if (ptr_size
== sizeof (unsigned int))
7074 gdb_assert_not_reached ("unhandled pointer size");
7079 struct link_map_offsets
7081 /* Offset and size of r_debug.r_version. */
7082 int r_version_offset
;
7084 /* Offset and size of r_debug.r_map. */
7087 /* Offset to l_addr field in struct link_map. */
7090 /* Offset to l_name field in struct link_map. */
7093 /* Offset to l_ld field in struct link_map. */
7096 /* Offset to l_next field in struct link_map. */
7099 /* Offset to l_prev field in struct link_map. */
7103 /* Construct qXfer:libraries-svr4:read reply. */
7106 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
7107 unsigned const char *writebuf
,
7108 CORE_ADDR offset
, int len
)
7111 unsigned document_len
;
7112 struct process_info_private
*const priv
= current_process ()->priv
;
7113 char filename
[PATH_MAX
];
7116 static const struct link_map_offsets lmo_32bit_offsets
=
7118 0, /* r_version offset. */
7119 4, /* r_debug.r_map offset. */
7120 0, /* l_addr offset in link_map. */
7121 4, /* l_name offset in link_map. */
7122 8, /* l_ld offset in link_map. */
7123 12, /* l_next offset in link_map. */
7124 16 /* l_prev offset in link_map. */
7127 static const struct link_map_offsets lmo_64bit_offsets
=
7129 0, /* r_version offset. */
7130 8, /* r_debug.r_map offset. */
7131 0, /* l_addr offset in link_map. */
7132 8, /* l_name offset in link_map. */
7133 16, /* l_ld offset in link_map. */
7134 24, /* l_next offset in link_map. */
7135 32 /* l_prev offset in link_map. */
7137 const struct link_map_offsets
*lmo
;
7138 unsigned int machine
;
7140 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7141 int allocated
= 1024;
7143 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7144 int header_done
= 0;
7146 if (writebuf
!= NULL
)
7148 if (readbuf
== NULL
)
7151 pid
= lwpid_of (current_thread
);
7152 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7153 is_elf64
= elf_64_file_p (filename
, &machine
);
7154 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7155 ptr_size
= is_elf64
? 8 : 4;
7157 while (annex
[0] != '\0')
7163 sep
= strchr (annex
, '=');
7168 if (len
== 5 && startswith (annex
, "start"))
7170 else if (len
== 4 && startswith (annex
, "prev"))
7174 annex
= strchr (sep
, ';');
7181 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7188 if (priv
->r_debug
== 0)
7189 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7191 /* We failed to find DT_DEBUG. Such situation will not change
7192 for this inferior - do not retry it. Report it to GDB as
7193 E01, see for the reasons at the GDB solib-svr4.c side. */
7194 if (priv
->r_debug
== (CORE_ADDR
) -1)
7197 if (priv
->r_debug
!= 0)
7199 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7200 (unsigned char *) &r_version
,
7201 sizeof (r_version
)) != 0
7204 warning ("unexpected r_debug version %d", r_version
);
7206 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7207 &lm_addr
, ptr_size
) != 0)
7209 warning ("unable to read r_map from 0x%lx",
7210 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7215 document
= (char *) xmalloc (allocated
);
7216 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7217 p
= document
+ strlen (document
);
7220 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7221 &l_name
, ptr_size
) == 0
7222 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7223 &l_addr
, ptr_size
) == 0
7224 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7225 &l_ld
, ptr_size
) == 0
7226 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7227 &l_prev
, ptr_size
) == 0
7228 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7229 &l_next
, ptr_size
) == 0)
7231 unsigned char libname
[PATH_MAX
];
7233 if (lm_prev
!= l_prev
)
7235 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7236 (long) lm_prev
, (long) l_prev
);
7240 /* Ignore the first entry even if it has valid name as the first entry
7241 corresponds to the main executable. The first entry should not be
7242 skipped if the dynamic loader was loaded late by a static executable
7243 (see solib-svr4.c parameter ignore_first). But in such case the main
7244 executable does not have PT_DYNAMIC present and this function already
7245 exited above due to failed get_r_debug. */
7248 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7253 /* Not checking for error because reading may stop before
7254 we've got PATH_MAX worth of characters. */
7256 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7257 libname
[sizeof (libname
) - 1] = '\0';
7258 if (libname
[0] != '\0')
7260 /* 6x the size for xml_escape_text below. */
7261 size_t len
= 6 * strlen ((char *) libname
);
7265 /* Terminate `<library-list-svr4'. */
7270 while (allocated
< p
- document
+ len
+ 200)
7272 /* Expand to guarantee sufficient storage. */
7273 uintptr_t document_len
= p
- document
;
7275 document
= (char *) xrealloc (document
, 2 * allocated
);
7277 p
= document
+ document_len
;
7280 std::string name
= xml_escape_text ((char *) libname
);
7281 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7282 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7283 name
.c_str (), (unsigned long) lm_addr
,
7284 (unsigned long) l_addr
, (unsigned long) l_ld
);
7294 /* Empty list; terminate `<library-list-svr4'. */
7298 strcpy (p
, "</library-list-svr4>");
7300 document_len
= strlen (document
);
7301 if (offset
< document_len
)
7302 document_len
-= offset
;
7305 if (len
> document_len
)
7308 memcpy (readbuf
, document
+ offset
, len
);
7314 #ifdef HAVE_LINUX_BTRACE
7316 /* See to_disable_btrace target method. */
7319 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7321 enum btrace_error err
;
7323 err
= linux_disable_btrace (tinfo
);
7324 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7327 /* Encode an Intel Processor Trace configuration. */
7330 linux_low_encode_pt_config (struct buffer
*buffer
,
7331 const struct btrace_data_pt_config
*config
)
7333 buffer_grow_str (buffer
, "<pt-config>\n");
7335 switch (config
->cpu
.vendor
)
7338 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7339 "model=\"%u\" stepping=\"%u\"/>\n",
7340 config
->cpu
.family
, config
->cpu
.model
,
7341 config
->cpu
.stepping
);
7348 buffer_grow_str (buffer
, "</pt-config>\n");
7351 /* Encode a raw buffer. */
7354 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7360 /* We use hex encoding - see common/rsp-low.h. */
7361 buffer_grow_str (buffer
, "<raw>\n");
7367 elem
[0] = tohex ((*data
>> 4) & 0xf);
7368 elem
[1] = tohex (*data
++ & 0xf);
7370 buffer_grow (buffer
, elem
, 2);
7373 buffer_grow_str (buffer
, "</raw>\n");
7376 /* See to_read_btrace target method. */
7379 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7380 enum btrace_read_type type
)
7382 struct btrace_data btrace
;
7383 struct btrace_block
*block
;
7384 enum btrace_error err
;
7387 btrace_data_init (&btrace
);
7389 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7390 if (err
!= BTRACE_ERR_NONE
)
7392 if (err
== BTRACE_ERR_OVERFLOW
)
7393 buffer_grow_str0 (buffer
, "E.Overflow.");
7395 buffer_grow_str0 (buffer
, "E.Generic Error.");
7400 switch (btrace
.format
)
7402 case BTRACE_FORMAT_NONE
:
7403 buffer_grow_str0 (buffer
, "E.No Trace.");
7406 case BTRACE_FORMAT_BTS
:
7407 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7408 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7411 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7413 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7414 paddress (block
->begin
), paddress (block
->end
));
7416 buffer_grow_str0 (buffer
, "</btrace>\n");
7419 case BTRACE_FORMAT_PT
:
7420 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7421 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7422 buffer_grow_str (buffer
, "<pt>\n");
7424 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7426 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7427 btrace
.variant
.pt
.size
);
7429 buffer_grow_str (buffer
, "</pt>\n");
7430 buffer_grow_str0 (buffer
, "</btrace>\n");
7434 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7438 btrace_data_fini (&btrace
);
7442 btrace_data_fini (&btrace
);
7446 /* See to_btrace_conf target method. */
7449 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7450 struct buffer
*buffer
)
7452 const struct btrace_config
*conf
;
7454 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7455 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7457 conf
= linux_btrace_conf (tinfo
);
7460 switch (conf
->format
)
7462 case BTRACE_FORMAT_NONE
:
7465 case BTRACE_FORMAT_BTS
:
7466 buffer_xml_printf (buffer
, "<bts");
7467 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7468 buffer_xml_printf (buffer
, " />\n");
7471 case BTRACE_FORMAT_PT
:
7472 buffer_xml_printf (buffer
, "<pt");
7473 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7474 buffer_xml_printf (buffer
, "/>\n");
7479 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7482 #endif /* HAVE_LINUX_BTRACE */
7484 /* See nat/linux-nat.h. */
7487 current_lwp_ptid (void)
7489 return ptid_of (current_thread
);
7492 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7495 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7497 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7498 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7500 return default_breakpoint_kind_from_pc (pcptr
);
7503 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7505 static const gdb_byte
*
7506 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7508 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7510 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7513 /* Implementation of the target_ops method
7514 "breakpoint_kind_from_current_state". */
7517 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7519 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7520 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7522 return linux_breakpoint_kind_from_pc (pcptr
);
7525 /* Default implementation of linux_target_ops method "set_pc" for
7526 32-bit pc register which is literally named "pc". */
7529 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7531 uint32_t newpc
= pc
;
7533 supply_register_by_name (regcache
, "pc", &newpc
);
7536 /* Default implementation of linux_target_ops method "get_pc" for
7537 32-bit pc register which is literally named "pc". */
7540 linux_get_pc_32bit (struct regcache
*regcache
)
7544 collect_register_by_name (regcache
, "pc", &pc
);
7546 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7550 /* Default implementation of linux_target_ops method "set_pc" for
7551 64-bit pc register which is literally named "pc". */
7554 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7556 uint64_t newpc
= pc
;
7558 supply_register_by_name (regcache
, "pc", &newpc
);
7561 /* Default implementation of linux_target_ops method "get_pc" for
7562 64-bit pc register which is literally named "pc". */
7565 linux_get_pc_64bit (struct regcache
*regcache
)
7569 collect_register_by_name (regcache
, "pc", &pc
);
7571 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7576 static struct target_ops linux_target_ops
= {
7577 linux_create_inferior
,
7578 linux_post_create_inferior
,
7587 linux_fetch_registers
,
7588 linux_store_registers
,
7589 linux_prepare_to_access_memory
,
7590 linux_done_accessing_memory
,
7593 linux_look_up_symbols
,
7594 linux_request_interrupt
,
7596 linux_supports_z_point_type
,
7599 linux_stopped_by_sw_breakpoint
,
7600 linux_supports_stopped_by_sw_breakpoint
,
7601 linux_stopped_by_hw_breakpoint
,
7602 linux_supports_stopped_by_hw_breakpoint
,
7603 linux_supports_hardware_single_step
,
7604 linux_stopped_by_watchpoint
,
7605 linux_stopped_data_address
,
7606 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7607 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7608 && defined(PT_TEXT_END_ADDR)
7613 #ifdef USE_THREAD_DB
7614 thread_db_get_tls_address
,
7619 hostio_last_error_from_errno
,
7622 linux_supports_non_stop
,
7624 linux_start_non_stop
,
7625 linux_supports_multi_process
,
7626 linux_supports_fork_events
,
7627 linux_supports_vfork_events
,
7628 linux_supports_exec_events
,
7629 linux_handle_new_gdb_connection
,
7630 #ifdef USE_THREAD_DB
7631 thread_db_handle_monitor_command
,
7635 linux_common_core_of_thread
,
7637 linux_process_qsupported
,
7638 linux_supports_tracepoints
,
7641 linux_thread_stopped
,
7645 linux_stabilize_threads
,
7646 linux_install_fast_tracepoint_jump_pad
,
7648 linux_supports_disable_randomization
,
7649 linux_get_min_fast_tracepoint_insn_len
,
7650 linux_qxfer_libraries_svr4
,
7651 linux_supports_agent
,
7652 #ifdef HAVE_LINUX_BTRACE
7653 linux_supports_btrace
,
7654 linux_enable_btrace
,
7655 linux_low_disable_btrace
,
7656 linux_low_read_btrace
,
7657 linux_low_btrace_conf
,
7665 linux_supports_range_stepping
,
7666 linux_proc_pid_to_exec_file
,
7667 linux_mntns_open_cloexec
,
7669 linux_mntns_readlink
,
7670 linux_breakpoint_kind_from_pc
,
7671 linux_sw_breakpoint_from_kind
,
7672 linux_proc_tid_get_name
,
7673 linux_breakpoint_kind_from_current_state
,
7674 linux_supports_software_single_step
,
7675 linux_supports_catch_syscall
,
7676 linux_get_ipa_tdesc_idx
,
7678 thread_db_thread_handle
,
7684 #ifdef HAVE_LINUX_REGSETS
7686 initialize_regsets_info (struct regsets_info
*info
)
7688 for (info
->num_regsets
= 0;
7689 info
->regsets
[info
->num_regsets
].size
>= 0;
7690 info
->num_regsets
++)
7696 initialize_low (void)
7698 struct sigaction sigchld_action
;
7700 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7701 set_target_ops (&linux_target_ops
);
7703 linux_ptrace_init_warnings ();
7705 sigchld_action
.sa_handler
= sigchld_handler
;
7706 sigemptyset (&sigchld_action
.sa_mask
);
7707 sigchld_action
.sa_flags
= SA_RESTART
;
7708 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7710 initialize_low_arch ();
7712 linux_check_ptrace_features ();