1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2017 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "linux-low.h"
21 #include "nat/linux-osdata.h"
25 #include "signals-state-save-restore.h"
26 #include "nat/linux-nat.h"
27 #include "nat/linux-waitpid.h"
29 #include "nat/gdb_ptrace.h"
30 #include "nat/linux-ptrace.h"
31 #include "nat/linux-procfs.h"
32 #include "nat/linux-personality.h"
34 #include <sys/ioctl.h>
37 #include <sys/syscall.h>
41 #include <sys/types.h>
46 #include "filestuff.h"
47 #include "tracepoint.h"
50 #include "common-inferior.h"
51 #include "nat/fork-inferior.h"
54 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
55 then ELFMAG0 will have been defined. If it didn't get included by
56 gdb_proc_service.h then including it will likely introduce a duplicate
57 definition of elf_fpregset_t. */
60 #include "nat/linux-namespaces.h"
63 #define SPUFS_MAGIC 0x23c9b64e
66 #ifdef HAVE_PERSONALITY
67 # include <sys/personality.h>
68 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
69 # define ADDR_NO_RANDOMIZE 0x0040000
77 /* Some targets did not define these ptrace constants from the start,
78 so gdbserver defines them locally here. In the future, these may
79 be removed after they are added to asm/ptrace.h. */
80 #if !(defined(PT_TEXT_ADDR) \
81 || defined(PT_DATA_ADDR) \
82 || defined(PT_TEXT_END_ADDR))
83 #if defined(__mcoldfire__)
84 /* These are still undefined in 3.10 kernels. */
85 #define PT_TEXT_ADDR 49*4
86 #define PT_DATA_ADDR 50*4
87 #define PT_TEXT_END_ADDR 51*4
88 /* BFIN already defines these since at least 2.6.32 kernels. */
90 #define PT_TEXT_ADDR 220
91 #define PT_TEXT_END_ADDR 224
92 #define PT_DATA_ADDR 228
93 /* These are still undefined in 3.10 kernels. */
94 #elif defined(__TMS320C6X__)
95 #define PT_TEXT_ADDR (0x10000*4)
96 #define PT_DATA_ADDR (0x10004*4)
97 #define PT_TEXT_END_ADDR (0x10008*4)
101 #ifdef HAVE_LINUX_BTRACE
102 # include "nat/linux-btrace.h"
103 # include "btrace-common.h"
106 #ifndef HAVE_ELF32_AUXV_T
107 /* Copied from glibc's elf.h. */
110 uint32_t a_type
; /* Entry type */
113 uint32_t a_val
; /* Integer value */
114 /* We use to have pointer elements added here. We cannot do that,
115 though, since it does not work when using 32-bit definitions
116 on 64-bit platforms and vice versa. */
121 #ifndef HAVE_ELF64_AUXV_T
122 /* Copied from glibc's elf.h. */
125 uint64_t a_type
; /* Entry type */
128 uint64_t a_val
; /* Integer value */
129 /* We use to have pointer elements added here. We cannot do that,
130 though, since it does not work when using 32-bit definitions
131 on 64-bit platforms and vice versa. */
136 /* Does the current host support PTRACE_GETREGSET? */
137 int have_ptrace_getregset
= -1;
141 /* See nat/linux-nat.h. */
144 ptid_of_lwp (struct lwp_info
*lwp
)
146 return ptid_of (get_lwp_thread (lwp
));
149 /* See nat/linux-nat.h. */
152 lwp_set_arch_private_info (struct lwp_info
*lwp
,
153 struct arch_lwp_info
*info
)
155 lwp
->arch_private
= info
;
158 /* See nat/linux-nat.h. */
160 struct arch_lwp_info
*
161 lwp_arch_private_info (struct lwp_info
*lwp
)
163 return lwp
->arch_private
;
166 /* See nat/linux-nat.h. */
169 lwp_is_stopped (struct lwp_info
*lwp
)
174 /* See nat/linux-nat.h. */
176 enum target_stop_reason
177 lwp_stop_reason (struct lwp_info
*lwp
)
179 return lwp
->stop_reason
;
182 /* See nat/linux-nat.h. */
185 lwp_is_stepping (struct lwp_info
*lwp
)
187 return lwp
->stepping
;
190 /* A list of all unknown processes which receive stop signals. Some
191 other process will presumably claim each of these as forked
192 children momentarily. */
194 struct simple_pid_list
196 /* The process ID. */
199 /* The status as reported by waitpid. */
203 struct simple_pid_list
*next
;
205 struct simple_pid_list
*stopped_pids
;
207 /* Trivial list manipulation functions to keep track of a list of new
208 stopped processes. */
211 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
213 struct simple_pid_list
*new_pid
= XNEW (struct simple_pid_list
);
216 new_pid
->status
= status
;
217 new_pid
->next
= *listp
;
222 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
224 struct simple_pid_list
**p
;
226 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
227 if ((*p
)->pid
== pid
)
229 struct simple_pid_list
*next
= (*p
)->next
;
231 *statusp
= (*p
)->status
;
239 enum stopping_threads_kind
241 /* Not stopping threads presently. */
242 NOT_STOPPING_THREADS
,
244 /* Stopping threads. */
247 /* Stopping and suspending threads. */
248 STOPPING_AND_SUSPENDING_THREADS
251 /* This is set while stop_all_lwps is in effect. */
252 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
254 /* FIXME make into a target method? */
255 int using_threads
= 1;
257 /* True if we're presently stabilizing threads (moving them out of
259 static int stabilizing_threads
;
261 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
262 int step
, int signal
, siginfo_t
*info
);
263 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
264 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
265 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
266 static void unsuspend_all_lwps (struct lwp_info
*except
);
267 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
268 int *wstat
, int options
);
269 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
270 static struct lwp_info
*add_lwp (ptid_t ptid
);
271 static void linux_mourn (struct process_info
*process
);
272 static int linux_stopped_by_watchpoint (void);
273 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
274 static int lwp_is_marked_dead (struct lwp_info
*lwp
);
275 static void proceed_all_lwps (void);
276 static int finish_step_over (struct lwp_info
*lwp
);
277 static int kill_lwp (unsigned long lwpid
, int signo
);
278 static void enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
);
279 static void complete_ongoing_step_over (void);
280 static int linux_low_ptrace_options (int attached
);
281 static int check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
);
282 static int proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
);
284 /* When the event-loop is doing a step-over, this points at the thread
286 ptid_t step_over_bkpt
;
288 /* True if the low target can hardware single-step. */
291 can_hardware_single_step (void)
293 if (the_low_target
.supports_hardware_single_step
!= NULL
)
294 return the_low_target
.supports_hardware_single_step ();
299 /* True if the low target can software single-step. Such targets
300 implement the GET_NEXT_PCS callback. */
303 can_software_single_step (void)
305 return (the_low_target
.get_next_pcs
!= NULL
);
308 /* True if the low target supports memory breakpoints. If so, we'll
309 have a GET_PC implementation. */
312 supports_breakpoints (void)
314 return (the_low_target
.get_pc
!= NULL
);
317 /* Returns true if this target can support fast tracepoints. This
318 does not mean that the in-process agent has been loaded in the
322 supports_fast_tracepoints (void)
324 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
327 /* True if LWP is stopped in its stepping range. */
330 lwp_in_step_range (struct lwp_info
*lwp
)
332 CORE_ADDR pc
= lwp
->stop_pc
;
334 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
337 struct pending_signals
341 struct pending_signals
*prev
;
344 /* The read/write ends of the pipe registered as waitable file in the
346 static int linux_event_pipe
[2] = { -1, -1 };
348 /* True if we're currently in async mode. */
349 #define target_is_async_p() (linux_event_pipe[0] != -1)
351 static void send_sigstop (struct lwp_info
*lwp
);
352 static void wait_for_sigstop (void);
354 /* Return non-zero if HEADER is a 64-bit ELF file. */
357 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
359 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
360 && header
->e_ident
[EI_MAG1
] == ELFMAG1
361 && header
->e_ident
[EI_MAG2
] == ELFMAG2
362 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
364 *machine
= header
->e_machine
;
365 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
372 /* Return non-zero if FILE is a 64-bit ELF file,
373 zero if the file is not a 64-bit ELF file,
374 and -1 if the file is not accessible or doesn't exist. */
377 elf_64_file_p (const char *file
, unsigned int *machine
)
382 fd
= open (file
, O_RDONLY
);
386 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
393 return elf_64_header_p (&header
, machine
);
396 /* Accepts an integer PID; Returns true if the executable PID is
397 running is a 64-bit ELF file.. */
400 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
404 sprintf (file
, "/proc/%d/exe", pid
);
405 return elf_64_file_p (file
, machine
);
409 delete_lwp (struct lwp_info
*lwp
)
411 struct thread_info
*thr
= get_lwp_thread (lwp
);
414 debug_printf ("deleting %ld\n", lwpid_of (thr
));
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 (struct inferior_list_entry
*entry
, void *args
)
1253 struct counter
*counter
= (struct counter
*) args
;
1255 if (ptid_get_pid (entry
->id
) == 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 (struct inferior_list_entry
*entry
, void *args
)
1366 struct thread_info
*thread
= (struct thread_info
*) entry
;
1367 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1368 int pid
= * (int *) args
;
1370 if (ptid_get_pid (entry
->id
) != pid
)
1373 /* We avoid killing the first thread here, because of a Linux kernel (at
1374 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1375 the children get a chance to be reaped, it will remain a zombie
1378 if (lwpid_of (thread
) == pid
)
1381 debug_printf ("lkop: is last of process %s\n",
1382 target_pid_to_str (entry
->id
));
1386 kill_wait_lwp (lwp
);
1391 linux_kill (int pid
)
1393 struct process_info
*process
;
1394 struct lwp_info
*lwp
;
1396 process
= find_process_pid (pid
);
1397 if (process
== NULL
)
1400 /* If we're killing a running inferior, make sure it is stopped
1401 first, as PTRACE_KILL will not work otherwise. */
1402 stop_all_lwps (0, NULL
);
1404 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1406 /* See the comment in linux_kill_one_lwp. We did not kill the first
1407 thread in the list, so do so now. */
1408 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1413 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1417 kill_wait_lwp (lwp
);
1419 the_target
->mourn (process
);
1421 /* Since we presently can only stop all lwps of all processes, we
1422 need to unstop lwps of other processes. */
1423 unstop_all_lwps (0, NULL
);
1427 /* Get pending signal of THREAD, for detaching purposes. This is the
1428 signal the thread last stopped for, which we need to deliver to the
1429 thread when detaching, otherwise, it'd be suppressed/lost. */
1432 get_detach_signal (struct thread_info
*thread
)
1434 enum gdb_signal signo
= GDB_SIGNAL_0
;
1436 struct lwp_info
*lp
= get_thread_lwp (thread
);
1438 if (lp
->status_pending_p
)
1439 status
= lp
->status_pending
;
1442 /* If the thread had been suspended by gdbserver, and it stopped
1443 cleanly, then it'll have stopped with SIGSTOP. But we don't
1444 want to deliver that SIGSTOP. */
1445 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1446 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1449 /* Otherwise, we may need to deliver the signal we
1451 status
= lp
->last_status
;
1454 if (!WIFSTOPPED (status
))
1457 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1458 target_pid_to_str (ptid_of (thread
)));
1462 /* Extended wait statuses aren't real SIGTRAPs. */
1463 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1466 debug_printf ("GPS: lwp %s had stopped with extended "
1467 "status: no pending signal\n",
1468 target_pid_to_str (ptid_of (thread
)));
1472 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1474 if (program_signals_p
&& !program_signals
[signo
])
1477 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1478 target_pid_to_str (ptid_of (thread
)),
1479 gdb_signal_to_string (signo
));
1482 else if (!program_signals_p
1483 /* If we have no way to know which signals GDB does not
1484 want to have passed to the program, assume
1485 SIGTRAP/SIGINT, which is GDB's default. */
1486 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1489 debug_printf ("GPS: lwp %s had signal %s, "
1490 "but we don't know if we should pass it. "
1491 "Default to not.\n",
1492 target_pid_to_str (ptid_of (thread
)),
1493 gdb_signal_to_string (signo
));
1499 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1500 target_pid_to_str (ptid_of (thread
)),
1501 gdb_signal_to_string (signo
));
1503 return WSTOPSIG (status
);
1507 /* Detach from LWP. */
1510 linux_detach_one_lwp (struct lwp_info
*lwp
)
1512 struct thread_info
*thread
= get_lwp_thread (lwp
);
1516 /* If there is a pending SIGSTOP, get rid of it. */
1517 if (lwp
->stop_expected
)
1520 debug_printf ("Sending SIGCONT to %s\n",
1521 target_pid_to_str (ptid_of (thread
)));
1523 kill_lwp (lwpid_of (thread
), SIGCONT
);
1524 lwp
->stop_expected
= 0;
1527 /* Pass on any pending signal for this thread. */
1528 sig
= get_detach_signal (thread
);
1530 /* Preparing to resume may try to write registers, and fail if the
1531 lwp is zombie. If that happens, ignore the error. We'll handle
1532 it below, when detach fails with ESRCH. */
1535 /* Flush any pending changes to the process's registers. */
1536 regcache_invalidate_thread (thread
);
1538 /* Finally, let it resume. */
1539 if (the_low_target
.prepare_to_resume
!= NULL
)
1540 the_low_target
.prepare_to_resume (lwp
);
1542 CATCH (ex
, RETURN_MASK_ERROR
)
1544 if (!check_ptrace_stopped_lwp_gone (lwp
))
1545 throw_exception (ex
);
1549 lwpid
= lwpid_of (thread
);
1550 if (ptrace (PTRACE_DETACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0,
1551 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1553 int save_errno
= errno
;
1555 /* We know the thread exists, so ESRCH must mean the lwp is
1556 zombie. This can happen if one of the already-detached
1557 threads exits the whole thread group. In that case we're
1558 still attached, and must reap the lwp. */
1559 if (save_errno
== ESRCH
)
1563 ret
= my_waitpid (lwpid
, &status
, __WALL
);
1566 warning (_("Couldn't reap LWP %d while detaching: %s"),
1567 lwpid
, strerror (errno
));
1569 else if (!WIFEXITED (status
) && !WIFSIGNALED (status
))
1571 warning (_("Reaping LWP %d while detaching "
1572 "returned unexpected status 0x%x"),
1578 error (_("Can't detach %s: %s"),
1579 target_pid_to_str (ptid_of (thread
)),
1580 strerror (save_errno
));
1583 else if (debug_threads
)
1585 debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n",
1586 target_pid_to_str (ptid_of (thread
)),
1593 /* Callback for find_inferior. Detaches from non-leader threads of a
1597 linux_detach_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1599 struct thread_info
*thread
= (struct thread_info
*) entry
;
1600 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1601 int pid
= *(int *) args
;
1602 int lwpid
= lwpid_of (thread
);
1604 /* Skip other processes. */
1605 if (ptid_get_pid (entry
->id
) != pid
)
1608 /* We don't actually detach from the thread group leader just yet.
1609 If the thread group exits, we must reap the zombie clone lwps
1610 before we're able to reap the leader. */
1611 if (ptid_get_pid (entry
->id
) == lwpid
)
1614 linux_detach_one_lwp (lwp
);
1619 linux_detach (int pid
)
1621 struct process_info
*process
;
1622 struct lwp_info
*main_lwp
;
1624 process
= find_process_pid (pid
);
1625 if (process
== NULL
)
1628 /* As there's a step over already in progress, let it finish first,
1629 otherwise nesting a stabilize_threads operation on top gets real
1631 complete_ongoing_step_over ();
1633 /* Stop all threads before detaching. First, ptrace requires that
1634 the thread is stopped to sucessfully detach. Second, thread_db
1635 may need to uninstall thread event breakpoints from memory, which
1636 only works with a stopped process anyway. */
1637 stop_all_lwps (0, NULL
);
1639 #ifdef USE_THREAD_DB
1640 thread_db_detach (process
);
1643 /* Stabilize threads (move out of jump pads). */
1644 stabilize_threads ();
1646 /* Detach from the clone lwps first. If the thread group exits just
1647 while we're detaching, we must reap the clone lwps before we're
1648 able to reap the leader. */
1649 find_inferior (&all_threads
, linux_detach_lwp_callback
, &pid
);
1651 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1652 linux_detach_one_lwp (main_lwp
);
1654 the_target
->mourn (process
);
1656 /* Since we presently can only stop all lwps of all processes, we
1657 need to unstop lwps of other processes. */
1658 unstop_all_lwps (0, NULL
);
1662 /* Remove all LWPs that belong to process PROC from the lwp list. */
1665 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1667 struct thread_info
*thread
= (struct thread_info
*) entry
;
1668 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1669 struct process_info
*process
= (struct process_info
*) proc
;
1671 if (pid_of (thread
) == pid_of (process
))
1678 linux_mourn (struct process_info
*process
)
1680 struct process_info_private
*priv
;
1682 #ifdef USE_THREAD_DB
1683 thread_db_mourn (process
);
1686 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1688 /* Freeing all private data. */
1689 priv
= process
->priv
;
1690 if (the_low_target
.delete_process
!= NULL
)
1691 the_low_target
.delete_process (priv
->arch_private
);
1693 gdb_assert (priv
->arch_private
== NULL
);
1695 process
->priv
= NULL
;
1697 remove_process (process
);
1701 linux_join (int pid
)
1706 ret
= my_waitpid (pid
, &status
, 0);
1707 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1709 } while (ret
!= -1 || errno
!= ECHILD
);
1712 /* Return nonzero if the given thread is still alive. */
1714 linux_thread_alive (ptid_t ptid
)
1716 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1718 /* We assume we always know if a thread exits. If a whole process
1719 exited but we still haven't been able to report it to GDB, we'll
1720 hold on to the last lwp of the dead process. */
1722 return !lwp_is_marked_dead (lwp
);
1727 /* Return 1 if this lwp still has an interesting status pending. If
1728 not (e.g., it had stopped for a breakpoint that is gone), return
1732 thread_still_has_status_pending_p (struct thread_info
*thread
)
1734 struct lwp_info
*lp
= get_thread_lwp (thread
);
1736 if (!lp
->status_pending_p
)
1739 if (thread
->last_resume_kind
!= resume_stop
1740 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1741 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1743 struct thread_info
*saved_thread
;
1747 gdb_assert (lp
->last_status
!= 0);
1751 saved_thread
= current_thread
;
1752 current_thread
= thread
;
1754 if (pc
!= lp
->stop_pc
)
1757 debug_printf ("PC of %ld changed\n",
1762 #if !USE_SIGTRAP_SIGINFO
1763 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1764 && !(*the_low_target
.breakpoint_at
) (pc
))
1767 debug_printf ("previous SW breakpoint of %ld gone\n",
1771 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1772 && !hardware_breakpoint_inserted_here (pc
))
1775 debug_printf ("previous HW breakpoint of %ld gone\n",
1781 current_thread
= saved_thread
;
1786 debug_printf ("discarding pending breakpoint status\n");
1787 lp
->status_pending_p
= 0;
1795 /* Returns true if LWP is resumed from the client's perspective. */
1798 lwp_resumed (struct lwp_info
*lwp
)
1800 struct thread_info
*thread
= get_lwp_thread (lwp
);
1802 if (thread
->last_resume_kind
!= resume_stop
)
1805 /* Did gdb send us a `vCont;t', but we haven't reported the
1806 corresponding stop to gdb yet? If so, the thread is still
1807 resumed/running from gdb's perspective. */
1808 if (thread
->last_resume_kind
== resume_stop
1809 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1815 /* Return 1 if this lwp has an interesting status pending. */
1817 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1819 struct thread_info
*thread
= (struct thread_info
*) entry
;
1820 struct lwp_info
*lp
= get_thread_lwp (thread
);
1821 ptid_t ptid
= * (ptid_t
*) arg
;
1823 /* Check if we're only interested in events from a specific process
1824 or a specific LWP. */
1825 if (!ptid_match (ptid_of (thread
), ptid
))
1828 if (!lwp_resumed (lp
))
1831 if (lp
->status_pending_p
1832 && !thread_still_has_status_pending_p (thread
))
1834 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1838 return lp
->status_pending_p
;
1842 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1844 ptid_t ptid
= *(ptid_t
*) data
;
1847 if (ptid_get_lwp (ptid
) != 0)
1848 lwp
= ptid_get_lwp (ptid
);
1850 lwp
= ptid_get_pid (ptid
);
1852 if (ptid_get_lwp (entry
->id
) == lwp
)
1859 find_lwp_pid (ptid_t ptid
)
1861 struct inferior_list_entry
*thread
1862 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1867 return get_thread_lwp ((struct thread_info
*) thread
);
1870 /* Return the number of known LWPs in the tgid given by PID. */
1875 struct inferior_list_entry
*inf
, *tmp
;
1878 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1880 if (ptid_get_pid (inf
->id
) == pid
)
1887 /* The arguments passed to iterate_over_lwps. */
1889 struct iterate_over_lwps_args
1891 /* The FILTER argument passed to iterate_over_lwps. */
1894 /* The CALLBACK argument passed to iterate_over_lwps. */
1895 iterate_over_lwps_ftype
*callback
;
1897 /* The DATA argument passed to iterate_over_lwps. */
1901 /* Callback for find_inferior used by iterate_over_lwps to filter
1902 calls to the callback supplied to that function. Returning a
1903 nonzero value causes find_inferiors to stop iterating and return
1904 the current inferior_list_entry. Returning zero indicates that
1905 find_inferiors should continue iterating. */
1908 iterate_over_lwps_filter (struct inferior_list_entry
*entry
, void *args_p
)
1910 struct iterate_over_lwps_args
*args
1911 = (struct iterate_over_lwps_args
*) args_p
;
1913 if (ptid_match (entry
->id
, args
->filter
))
1915 struct thread_info
*thr
= (struct thread_info
*) entry
;
1916 struct lwp_info
*lwp
= get_thread_lwp (thr
);
1918 return (*args
->callback
) (lwp
, args
->data
);
1924 /* See nat/linux-nat.h. */
1927 iterate_over_lwps (ptid_t filter
,
1928 iterate_over_lwps_ftype callback
,
1931 struct iterate_over_lwps_args args
= {filter
, callback
, data
};
1932 struct inferior_list_entry
*entry
;
1934 entry
= find_inferior (&all_threads
, iterate_over_lwps_filter
, &args
);
1938 return get_thread_lwp ((struct thread_info
*) entry
);
1941 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1942 their exits until all other threads in the group have exited. */
1945 check_zombie_leaders (void)
1947 struct process_info
*proc
, *tmp
;
1949 ALL_PROCESSES (proc
, tmp
)
1951 pid_t leader_pid
= pid_of (proc
);
1952 struct lwp_info
*leader_lp
;
1954 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1957 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1958 "num_lwps=%d, zombie=%d\n",
1959 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1960 linux_proc_pid_is_zombie (leader_pid
));
1962 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1963 /* Check if there are other threads in the group, as we may
1964 have raced with the inferior simply exiting. */
1965 && !last_thread_of_process_p (leader_pid
)
1966 && linux_proc_pid_is_zombie (leader_pid
))
1968 /* A leader zombie can mean one of two things:
1970 - It exited, and there's an exit status pending
1971 available, or only the leader exited (not the whole
1972 program). In the latter case, we can't waitpid the
1973 leader's exit status until all other threads are gone.
1975 - There are 3 or more threads in the group, and a thread
1976 other than the leader exec'd. On an exec, the Linux
1977 kernel destroys all other threads (except the execing
1978 one) in the thread group, and resets the execing thread's
1979 tid to the tgid. No exit notification is sent for the
1980 execing thread -- from the ptracer's perspective, it
1981 appears as though the execing thread just vanishes.
1982 Until we reap all other threads except the leader and the
1983 execing thread, the leader will be zombie, and the
1984 execing thread will be in `D (disc sleep)'. As soon as
1985 all other threads are reaped, the execing thread changes
1986 it's tid to the tgid, and the previous (zombie) leader
1987 vanishes, giving place to the "new" leader. We could try
1988 distinguishing the exit and exec cases, by waiting once
1989 more, and seeing if something comes out, but it doesn't
1990 sound useful. The previous leader _does_ go away, and
1991 we'll re-add the new one once we see the exec event
1992 (which is just the same as what would happen if the
1993 previous leader did exit voluntarily before some other
1997 debug_printf ("CZL: Thread group leader %d zombie "
1998 "(it exited, or another thread execd).\n",
2001 delete_lwp (leader_lp
);
2006 /* Callback for `find_inferior'. Returns the first LWP that is not
2007 stopped. ARG is a PTID filter. */
2010 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
2012 struct thread_info
*thr
= (struct thread_info
*) entry
;
2013 struct lwp_info
*lwp
;
2014 ptid_t filter
= *(ptid_t
*) arg
;
2016 if (!ptid_match (ptid_of (thr
), filter
))
2019 lwp
= get_thread_lwp (thr
);
2026 /* Increment LWP's suspend count. */
2029 lwp_suspended_inc (struct lwp_info
*lwp
)
2033 if (debug_threads
&& lwp
->suspended
> 4)
2035 struct thread_info
*thread
= get_lwp_thread (lwp
);
2037 debug_printf ("LWP %ld has a suspiciously high suspend count,"
2038 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
2042 /* Decrement LWP's suspend count. */
2045 lwp_suspended_decr (struct lwp_info
*lwp
)
2049 if (lwp
->suspended
< 0)
2051 struct thread_info
*thread
= get_lwp_thread (lwp
);
2053 internal_error (__FILE__
, __LINE__
,
2054 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
2059 /* This function should only be called if the LWP got a SIGTRAP.
2061 Handle any tracepoint steps or hits. Return true if a tracepoint
2062 event was handled, 0 otherwise. */
2065 handle_tracepoints (struct lwp_info
*lwp
)
2067 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
2068 int tpoint_related_event
= 0;
2070 gdb_assert (lwp
->suspended
== 0);
2072 /* If this tracepoint hit causes a tracing stop, we'll immediately
2073 uninsert tracepoints. To do this, we temporarily pause all
2074 threads, unpatch away, and then unpause threads. We need to make
2075 sure the unpausing doesn't resume LWP too. */
2076 lwp_suspended_inc (lwp
);
2078 /* And we need to be sure that any all-threads-stopping doesn't try
2079 to move threads out of the jump pads, as it could deadlock the
2080 inferior (LWP could be in the jump pad, maybe even holding the
2083 /* Do any necessary step collect actions. */
2084 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2086 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2088 /* See if we just hit a tracepoint and do its main collect
2090 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2092 lwp_suspended_decr (lwp
);
2094 gdb_assert (lwp
->suspended
== 0);
2095 gdb_assert (!stabilizing_threads
2096 || (lwp
->collecting_fast_tracepoint
2097 != fast_tpoint_collect_result::not_collecting
));
2099 if (tpoint_related_event
)
2102 debug_printf ("got a tracepoint event\n");
2109 /* Convenience wrapper. Returns information about LWP's fast tracepoint
2110 collection status. */
2112 static fast_tpoint_collect_result
2113 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2114 struct fast_tpoint_collect_status
*status
)
2116 CORE_ADDR thread_area
;
2117 struct thread_info
*thread
= get_lwp_thread (lwp
);
2119 if (the_low_target
.get_thread_area
== NULL
)
2120 return fast_tpoint_collect_result::not_collecting
;
2122 /* Get the thread area address. This is used to recognize which
2123 thread is which when tracing with the in-process agent library.
2124 We don't read anything from the address, and treat it as opaque;
2125 it's the address itself that we assume is unique per-thread. */
2126 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2127 return fast_tpoint_collect_result::not_collecting
;
2129 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2132 /* The reason we resume in the caller, is because we want to be able
2133 to pass lwp->status_pending as WSTAT, and we need to clear
2134 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2135 refuses to resume. */
2138 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2140 struct thread_info
*saved_thread
;
2142 saved_thread
= current_thread
;
2143 current_thread
= get_lwp_thread (lwp
);
2146 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2147 && supports_fast_tracepoints ()
2148 && agent_loaded_p ())
2150 struct fast_tpoint_collect_status status
;
2153 debug_printf ("Checking whether LWP %ld needs to move out of the "
2155 lwpid_of (current_thread
));
2157 fast_tpoint_collect_result r
2158 = linux_fast_tracepoint_collecting (lwp
, &status
);
2161 || (WSTOPSIG (*wstat
) != SIGILL
2162 && WSTOPSIG (*wstat
) != SIGFPE
2163 && WSTOPSIG (*wstat
) != SIGSEGV
2164 && WSTOPSIG (*wstat
) != SIGBUS
))
2166 lwp
->collecting_fast_tracepoint
= r
;
2168 if (r
!= fast_tpoint_collect_result::not_collecting
)
2170 if (r
== fast_tpoint_collect_result::before_insn
2171 && lwp
->exit_jump_pad_bkpt
== NULL
)
2173 /* Haven't executed the original instruction yet.
2174 Set breakpoint there, and wait till it's hit,
2175 then single-step until exiting the jump pad. */
2176 lwp
->exit_jump_pad_bkpt
2177 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2181 debug_printf ("Checking whether LWP %ld needs to move out of "
2182 "the jump pad...it does\n",
2183 lwpid_of (current_thread
));
2184 current_thread
= saved_thread
;
2191 /* If we get a synchronous signal while collecting, *and*
2192 while executing the (relocated) original instruction,
2193 reset the PC to point at the tpoint address, before
2194 reporting to GDB. Otherwise, it's an IPA lib bug: just
2195 report the signal to GDB, and pray for the best. */
2197 lwp
->collecting_fast_tracepoint
2198 = fast_tpoint_collect_result::not_collecting
;
2200 if (r
!= fast_tpoint_collect_result::not_collecting
2201 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2202 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2205 struct regcache
*regcache
;
2207 /* The si_addr on a few signals references the address
2208 of the faulting instruction. Adjust that as
2210 if ((WSTOPSIG (*wstat
) == SIGILL
2211 || WSTOPSIG (*wstat
) == SIGFPE
2212 || WSTOPSIG (*wstat
) == SIGBUS
2213 || WSTOPSIG (*wstat
) == SIGSEGV
)
2214 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2215 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2216 /* Final check just to make sure we don't clobber
2217 the siginfo of non-kernel-sent signals. */
2218 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2220 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2221 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2222 (PTRACE_TYPE_ARG3
) 0, &info
);
2225 regcache
= get_thread_regcache (current_thread
, 1);
2226 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2227 lwp
->stop_pc
= status
.tpoint_addr
;
2229 /* Cancel any fast tracepoint lock this thread was
2231 force_unlock_trace_buffer ();
2234 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2237 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2238 "stopping all threads momentarily.\n");
2240 stop_all_lwps (1, lwp
);
2242 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2243 lwp
->exit_jump_pad_bkpt
= NULL
;
2245 unstop_all_lwps (1, lwp
);
2247 gdb_assert (lwp
->suspended
>= 0);
2253 debug_printf ("Checking whether LWP %ld needs to move out of the "
2255 lwpid_of (current_thread
));
2257 current_thread
= saved_thread
;
2261 /* Enqueue one signal in the "signals to report later when out of the
2265 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2267 struct pending_signals
*p_sig
;
2268 struct thread_info
*thread
= get_lwp_thread (lwp
);
2271 debug_printf ("Deferring signal %d for LWP %ld.\n",
2272 WSTOPSIG (*wstat
), lwpid_of (thread
));
2276 struct pending_signals
*sig
;
2278 for (sig
= lwp
->pending_signals_to_report
;
2281 debug_printf (" Already queued %d\n",
2284 debug_printf (" (no more currently queued signals)\n");
2287 /* Don't enqueue non-RT signals if they are already in the deferred
2288 queue. (SIGSTOP being the easiest signal to see ending up here
2290 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2292 struct pending_signals
*sig
;
2294 for (sig
= lwp
->pending_signals_to_report
;
2298 if (sig
->signal
== WSTOPSIG (*wstat
))
2301 debug_printf ("Not requeuing already queued non-RT signal %d"
2310 p_sig
= XCNEW (struct pending_signals
);
2311 p_sig
->prev
= lwp
->pending_signals_to_report
;
2312 p_sig
->signal
= WSTOPSIG (*wstat
);
2314 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2317 lwp
->pending_signals_to_report
= p_sig
;
2320 /* Dequeue one signal from the "signals to report later when out of
2321 the jump pad" list. */
2324 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2326 struct thread_info
*thread
= get_lwp_thread (lwp
);
2328 if (lwp
->pending_signals_to_report
!= NULL
)
2330 struct pending_signals
**p_sig
;
2332 p_sig
= &lwp
->pending_signals_to_report
;
2333 while ((*p_sig
)->prev
!= NULL
)
2334 p_sig
= &(*p_sig
)->prev
;
2336 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2337 if ((*p_sig
)->info
.si_signo
!= 0)
2338 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2344 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2345 WSTOPSIG (*wstat
), lwpid_of (thread
));
2349 struct pending_signals
*sig
;
2351 for (sig
= lwp
->pending_signals_to_report
;
2354 debug_printf (" Still queued %d\n",
2357 debug_printf (" (no more queued signals)\n");
2366 /* Fetch the possibly triggered data watchpoint info and store it in
2369 On some archs, like x86, that use debug registers to set
2370 watchpoints, it's possible that the way to know which watched
2371 address trapped, is to check the register that is used to select
2372 which address to watch. Problem is, between setting the watchpoint
2373 and reading back which data address trapped, the user may change
2374 the set of watchpoints, and, as a consequence, GDB changes the
2375 debug registers in the inferior. To avoid reading back a stale
2376 stopped-data-address when that happens, we cache in LP the fact
2377 that a watchpoint trapped, and the corresponding data address, as
2378 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2379 registers meanwhile, we have the cached data we can rely on. */
2382 check_stopped_by_watchpoint (struct lwp_info
*child
)
2384 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2386 struct thread_info
*saved_thread
;
2388 saved_thread
= current_thread
;
2389 current_thread
= get_lwp_thread (child
);
2391 if (the_low_target
.stopped_by_watchpoint ())
2393 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2395 if (the_low_target
.stopped_data_address
!= NULL
)
2396 child
->stopped_data_address
2397 = the_low_target
.stopped_data_address ();
2399 child
->stopped_data_address
= 0;
2402 current_thread
= saved_thread
;
2405 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2408 /* Return the ptrace options that we want to try to enable. */
2411 linux_low_ptrace_options (int attached
)
2416 options
|= PTRACE_O_EXITKILL
;
2418 if (report_fork_events
)
2419 options
|= PTRACE_O_TRACEFORK
;
2421 if (report_vfork_events
)
2422 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2424 if (report_exec_events
)
2425 options
|= PTRACE_O_TRACEEXEC
;
2427 options
|= PTRACE_O_TRACESYSGOOD
;
2432 /* Do low-level handling of the event, and check if we should go on
2433 and pass it to caller code. Return the affected lwp if we are, or
2436 static struct lwp_info
*
2437 linux_low_filter_event (int lwpid
, int wstat
)
2439 struct lwp_info
*child
;
2440 struct thread_info
*thread
;
2441 int have_stop_pc
= 0;
2443 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2445 /* Check for stop events reported by a process we didn't already
2446 know about - anything not already in our LWP list.
2448 If we're expecting to receive stopped processes after
2449 fork, vfork, and clone events, then we'll just add the
2450 new one to our list and go back to waiting for the event
2451 to be reported - the stopped process might be returned
2452 from waitpid before or after the event is.
2454 But note the case of a non-leader thread exec'ing after the
2455 leader having exited, and gone from our lists (because
2456 check_zombie_leaders deleted it). The non-leader thread
2457 changes its tid to the tgid. */
2459 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2460 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2464 /* A multi-thread exec after we had seen the leader exiting. */
2467 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2468 "after exec.\n", lwpid
);
2471 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2472 child
= add_lwp (child_ptid
);
2474 current_thread
= child
->thread
;
2477 /* If we didn't find a process, one of two things presumably happened:
2478 - A process we started and then detached from has exited. Ignore it.
2479 - A process we are controlling has forked and the new child's stop
2480 was reported to us by the kernel. Save its PID. */
2481 if (child
== NULL
&& WIFSTOPPED (wstat
))
2483 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2486 else if (child
== NULL
)
2489 thread
= get_lwp_thread (child
);
2493 child
->last_status
= wstat
;
2495 /* Check if the thread has exited. */
2496 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2499 debug_printf ("LLFE: %d exited.\n", lwpid
);
2501 if (finish_step_over (child
))
2503 /* Unsuspend all other LWPs, and set them back running again. */
2504 unsuspend_all_lwps (child
);
2507 /* If there is at least one more LWP, then the exit signal was
2508 not the end of the debugged application and should be
2509 ignored, unless GDB wants to hear about thread exits. */
2510 if (report_thread_events
2511 || last_thread_of_process_p (pid_of (thread
)))
2513 /* Since events are serialized to GDB core, and we can't
2514 report this one right now. Leave the status pending for
2515 the next time we're able to report it. */
2516 mark_lwp_dead (child
, wstat
);
2526 gdb_assert (WIFSTOPPED (wstat
));
2528 if (WIFSTOPPED (wstat
))
2530 struct process_info
*proc
;
2532 /* Architecture-specific setup after inferior is running. */
2533 proc
= find_process_pid (pid_of (thread
));
2534 if (proc
->tdesc
== NULL
)
2538 /* This needs to happen after we have attached to the
2539 inferior and it is stopped for the first time, but
2540 before we access any inferior registers. */
2541 linux_arch_setup_thread (thread
);
2545 /* The process is started, but GDBserver will do
2546 architecture-specific setup after the program stops at
2547 the first instruction. */
2548 child
->status_pending_p
= 1;
2549 child
->status_pending
= wstat
;
2555 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2557 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2558 int options
= linux_low_ptrace_options (proc
->attached
);
2560 linux_enable_event_reporting (lwpid
, options
);
2561 child
->must_set_ptrace_flags
= 0;
2564 /* Always update syscall_state, even if it will be filtered later. */
2565 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2567 child
->syscall_state
2568 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2569 ? TARGET_WAITKIND_SYSCALL_RETURN
2570 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2574 /* Almost all other ptrace-stops are known to be outside of system
2575 calls, with further exceptions in handle_extended_wait. */
2576 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2579 /* Be careful to not overwrite stop_pc until save_stop_reason is
2581 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2582 && linux_is_extended_waitstatus (wstat
))
2584 child
->stop_pc
= get_pc (child
);
2585 if (handle_extended_wait (&child
, wstat
))
2587 /* The event has been handled, so just return without
2593 if (linux_wstatus_maybe_breakpoint (wstat
))
2595 if (save_stop_reason (child
))
2600 child
->stop_pc
= get_pc (child
);
2602 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2603 && child
->stop_expected
)
2606 debug_printf ("Expected stop.\n");
2607 child
->stop_expected
= 0;
2609 if (thread
->last_resume_kind
== resume_stop
)
2611 /* We want to report the stop to the core. Treat the
2612 SIGSTOP as a normal event. */
2614 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2615 target_pid_to_str (ptid_of (thread
)));
2617 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2619 /* Stopping threads. We don't want this SIGSTOP to end up
2622 debug_printf ("LLW: SIGSTOP caught for %s "
2623 "while stopping threads.\n",
2624 target_pid_to_str (ptid_of (thread
)));
2629 /* This is a delayed SIGSTOP. Filter out the event. */
2631 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2632 child
->stepping
? "step" : "continue",
2633 target_pid_to_str (ptid_of (thread
)));
2635 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2640 child
->status_pending_p
= 1;
2641 child
->status_pending
= wstat
;
2645 /* Return true if THREAD is doing hardware single step. */
2648 maybe_hw_step (struct thread_info
*thread
)
2650 if (can_hardware_single_step ())
2654 /* GDBserver must insert single-step breakpoint for software
2656 gdb_assert (has_single_step_breakpoints (thread
));
2661 /* Resume LWPs that are currently stopped without any pending status
2662 to report, but are resumed from the core's perspective. */
2665 resume_stopped_resumed_lwps (struct inferior_list_entry
*entry
)
2667 struct thread_info
*thread
= (struct thread_info
*) entry
;
2668 struct lwp_info
*lp
= get_thread_lwp (thread
);
2672 && !lp
->status_pending_p
2673 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2677 if (thread
->last_resume_kind
== resume_step
)
2678 step
= maybe_hw_step (thread
);
2681 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2682 target_pid_to_str (ptid_of (thread
)),
2683 paddress (lp
->stop_pc
),
2686 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2690 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2691 match FILTER_PTID (leaving others pending). The PTIDs can be:
2692 minus_one_ptid, to specify any child; a pid PTID, specifying all
2693 lwps of a thread group; or a PTID representing a single lwp. Store
2694 the stop status through the status pointer WSTAT. OPTIONS is
2695 passed to the waitpid call. Return 0 if no event was found and
2696 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2697 was found. Return the PID of the stopped child otherwise. */
2700 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2701 int *wstatp
, int options
)
2703 struct thread_info
*event_thread
;
2704 struct lwp_info
*event_child
, *requested_child
;
2705 sigset_t block_mask
, prev_mask
;
2708 /* N.B. event_thread points to the thread_info struct that contains
2709 event_child. Keep them in sync. */
2710 event_thread
= NULL
;
2712 requested_child
= NULL
;
2714 /* Check for a lwp with a pending status. */
2716 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2718 event_thread
= (struct thread_info
*)
2719 find_inferior_in_random (&all_threads
, status_pending_p_callback
,
2721 if (event_thread
!= NULL
)
2722 event_child
= get_thread_lwp (event_thread
);
2723 if (debug_threads
&& event_thread
)
2724 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2726 else if (!ptid_equal (filter_ptid
, null_ptid
))
2728 requested_child
= find_lwp_pid (filter_ptid
);
2730 if (stopping_threads
== NOT_STOPPING_THREADS
2731 && requested_child
->status_pending_p
2732 && (requested_child
->collecting_fast_tracepoint
2733 != fast_tpoint_collect_result::not_collecting
))
2735 enqueue_one_deferred_signal (requested_child
,
2736 &requested_child
->status_pending
);
2737 requested_child
->status_pending_p
= 0;
2738 requested_child
->status_pending
= 0;
2739 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2742 if (requested_child
->suspended
2743 && requested_child
->status_pending_p
)
2745 internal_error (__FILE__
, __LINE__
,
2746 "requesting an event out of a"
2747 " suspended child?");
2750 if (requested_child
->status_pending_p
)
2752 event_child
= requested_child
;
2753 event_thread
= get_lwp_thread (event_child
);
2757 if (event_child
!= NULL
)
2760 debug_printf ("Got an event from pending child %ld (%04x)\n",
2761 lwpid_of (event_thread
), event_child
->status_pending
);
2762 *wstatp
= event_child
->status_pending
;
2763 event_child
->status_pending_p
= 0;
2764 event_child
->status_pending
= 0;
2765 current_thread
= event_thread
;
2766 return lwpid_of (event_thread
);
2769 /* But if we don't find a pending event, we'll have to wait.
2771 We only enter this loop if no process has a pending wait status.
2772 Thus any action taken in response to a wait status inside this
2773 loop is responding as soon as we detect the status, not after any
2776 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2777 all signals while here. */
2778 sigfillset (&block_mask
);
2779 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2781 /* Always pull all events out of the kernel. We'll randomly select
2782 an event LWP out of all that have events, to prevent
2784 while (event_child
== NULL
)
2788 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2791 - If the thread group leader exits while other threads in the
2792 thread group still exist, waitpid(TGID, ...) hangs. That
2793 waitpid won't return an exit status until the other threads
2794 in the group are reaped.
2796 - When a non-leader thread execs, that thread just vanishes
2797 without reporting an exit (so we'd hang if we waited for it
2798 explicitly in that case). The exec event is reported to
2801 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2804 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2805 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2811 debug_printf ("LLW: waitpid %ld received %s\n",
2812 (long) ret
, status_to_str (*wstatp
));
2815 /* Filter all events. IOW, leave all events pending. We'll
2816 randomly select an event LWP out of all that have events
2818 linux_low_filter_event (ret
, *wstatp
);
2819 /* Retry until nothing comes out of waitpid. A single
2820 SIGCHLD can indicate more than one child stopped. */
2824 /* Now that we've pulled all events out of the kernel, resume
2825 LWPs that don't have an interesting event to report. */
2826 if (stopping_threads
== NOT_STOPPING_THREADS
)
2827 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2829 /* ... and find an LWP with a status to report to the core, if
2831 event_thread
= (struct thread_info
*)
2832 find_inferior_in_random (&all_threads
, status_pending_p_callback
,
2834 if (event_thread
!= NULL
)
2836 event_child
= get_thread_lwp (event_thread
);
2837 *wstatp
= event_child
->status_pending
;
2838 event_child
->status_pending_p
= 0;
2839 event_child
->status_pending
= 0;
2843 /* Check for zombie thread group leaders. Those can't be reaped
2844 until all other threads in the thread group are. */
2845 check_zombie_leaders ();
2847 /* If there are no resumed children left in the set of LWPs we
2848 want to wait for, bail. We can't just block in
2849 waitpid/sigsuspend, because lwps might have been left stopped
2850 in trace-stop state, and we'd be stuck forever waiting for
2851 their status to change (which would only happen if we resumed
2852 them). Even if WNOHANG is set, this return code is preferred
2853 over 0 (below), as it is more detailed. */
2854 if ((find_inferior (&all_threads
,
2855 not_stopped_callback
,
2856 &wait_ptid
) == NULL
))
2859 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2860 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2864 /* No interesting event to report to the caller. */
2865 if ((options
& WNOHANG
))
2868 debug_printf ("WNOHANG set, no event found\n");
2870 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2874 /* Block until we get an event reported with SIGCHLD. */
2876 debug_printf ("sigsuspend'ing\n");
2878 sigsuspend (&prev_mask
);
2879 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2883 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2885 current_thread
= event_thread
;
2887 return lwpid_of (event_thread
);
2890 /* Wait for an event from child(ren) PTID. PTIDs can be:
2891 minus_one_ptid, to specify any child; a pid PTID, specifying all
2892 lwps of a thread group; or a PTID representing a single lwp. Store
2893 the stop status through the status pointer WSTAT. OPTIONS is
2894 passed to the waitpid call. Return 0 if no event was found and
2895 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2896 was found. Return the PID of the stopped child otherwise. */
2899 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2901 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2904 /* Count the LWP's that have had events. */
2907 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2909 struct thread_info
*thread
= (struct thread_info
*) entry
;
2910 struct lwp_info
*lp
= get_thread_lwp (thread
);
2911 int *count
= (int *) data
;
2913 gdb_assert (count
!= NULL
);
2915 /* Count only resumed LWPs that have an event pending. */
2916 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2917 && lp
->status_pending_p
)
2923 /* Select the LWP (if any) that is currently being single-stepped. */
2926 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2928 struct thread_info
*thread
= (struct thread_info
*) entry
;
2929 struct lwp_info
*lp
= get_thread_lwp (thread
);
2931 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2932 && thread
->last_resume_kind
== resume_step
2933 && lp
->status_pending_p
)
2939 /* Select the Nth LWP that has had an event. */
2942 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2944 struct thread_info
*thread
= (struct thread_info
*) entry
;
2945 struct lwp_info
*lp
= get_thread_lwp (thread
);
2946 int *selector
= (int *) data
;
2948 gdb_assert (selector
!= NULL
);
2950 /* Select only resumed LWPs that have an event pending. */
2951 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2952 && lp
->status_pending_p
)
2953 if ((*selector
)-- == 0)
2959 /* Select one LWP out of those that have events pending. */
2962 select_event_lwp (struct lwp_info
**orig_lp
)
2965 int random_selector
;
2966 struct thread_info
*event_thread
= NULL
;
2968 /* In all-stop, give preference to the LWP that is being
2969 single-stepped. There will be at most one, and it's the LWP that
2970 the core is most interested in. If we didn't do this, then we'd
2971 have to handle pending step SIGTRAPs somehow in case the core
2972 later continues the previously-stepped thread, otherwise we'd
2973 report the pending SIGTRAP, and the core, not having stepped the
2974 thread, wouldn't understand what the trap was for, and therefore
2975 would report it to the user as a random signal. */
2979 = (struct thread_info
*) find_inferior (&all_threads
,
2980 select_singlestep_lwp_callback
,
2982 if (event_thread
!= NULL
)
2985 debug_printf ("SEL: Select single-step %s\n",
2986 target_pid_to_str (ptid_of (event_thread
)));
2989 if (event_thread
== NULL
)
2991 /* No single-stepping LWP. Select one at random, out of those
2992 which have had events. */
2994 /* First see how many events we have. */
2995 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2996 gdb_assert (num_events
> 0);
2998 /* Now randomly pick a LWP out of those that have had
3000 random_selector
= (int)
3001 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
3003 if (debug_threads
&& num_events
> 1)
3004 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
3005 num_events
, random_selector
);
3008 = (struct thread_info
*) find_inferior (&all_threads
,
3009 select_event_lwp_callback
,
3013 if (event_thread
!= NULL
)
3015 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
3017 /* Switch the event LWP. */
3018 *orig_lp
= event_lp
;
3022 /* Decrement the suspend count of an LWP. */
3025 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
3027 struct thread_info
*thread
= (struct thread_info
*) entry
;
3028 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3030 /* Ignore EXCEPT. */
3034 lwp_suspended_decr (lwp
);
3038 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
3042 unsuspend_all_lwps (struct lwp_info
*except
)
3044 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
3047 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
3048 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
3050 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
3051 static ptid_t
linux_wait_1 (ptid_t ptid
,
3052 struct target_waitstatus
*ourstatus
,
3053 int target_options
);
3055 /* Stabilize threads (move out of jump pads).
3057 If a thread is midway collecting a fast tracepoint, we need to
3058 finish the collection and move it out of the jump pad before
3059 reporting the signal.
3061 This avoids recursion while collecting (when a signal arrives
3062 midway, and the signal handler itself collects), which would trash
3063 the trace buffer. In case the user set a breakpoint in a signal
3064 handler, this avoids the backtrace showing the jump pad, etc..
3065 Most importantly, there are certain things we can't do safely if
3066 threads are stopped in a jump pad (or in its callee's). For
3069 - starting a new trace run. A thread still collecting the
3070 previous run, could trash the trace buffer when resumed. The trace
3071 buffer control structures would have been reset but the thread had
3072 no way to tell. The thread could even midway memcpy'ing to the
3073 buffer, which would mean that when resumed, it would clobber the
3074 trace buffer that had been set for a new run.
3076 - we can't rewrite/reuse the jump pads for new tracepoints
3077 safely. Say you do tstart while a thread is stopped midway while
3078 collecting. When the thread is later resumed, it finishes the
3079 collection, and returns to the jump pad, to execute the original
3080 instruction that was under the tracepoint jump at the time the
3081 older run had been started. If the jump pad had been rewritten
3082 since for something else in the new run, the thread would now
3083 execute the wrong / random instructions. */
3086 linux_stabilize_threads (void)
3088 struct thread_info
*saved_thread
;
3089 struct thread_info
*thread_stuck
;
3092 = (struct thread_info
*) find_inferior (&all_threads
,
3093 stuck_in_jump_pad_callback
,
3095 if (thread_stuck
!= NULL
)
3098 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
3099 lwpid_of (thread_stuck
));
3103 saved_thread
= current_thread
;
3105 stabilizing_threads
= 1;
3108 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
3110 /* Loop until all are stopped out of the jump pads. */
3111 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
3113 struct target_waitstatus ourstatus
;
3114 struct lwp_info
*lwp
;
3117 /* Note that we go through the full wait even loop. While
3118 moving threads out of jump pad, we need to be able to step
3119 over internal breakpoints and such. */
3120 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
3122 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
3124 lwp
= get_thread_lwp (current_thread
);
3127 lwp_suspended_inc (lwp
);
3129 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3130 || current_thread
->last_resume_kind
== resume_stop
)
3132 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3133 enqueue_one_deferred_signal (lwp
, &wstat
);
3138 unsuspend_all_lwps (NULL
);
3140 stabilizing_threads
= 0;
3142 current_thread
= saved_thread
;
3147 = (struct thread_info
*) find_inferior (&all_threads
,
3148 stuck_in_jump_pad_callback
,
3150 if (thread_stuck
!= NULL
)
3151 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3152 lwpid_of (thread_stuck
));
3156 /* Convenience function that is called when the kernel reports an
3157 event that is not passed out to GDB. */
3160 ignore_event (struct target_waitstatus
*ourstatus
)
3162 /* If we got an event, there may still be others, as a single
3163 SIGCHLD can indicate more than one child stopped. This forces
3164 another target_wait call. */
3167 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3171 /* Convenience function that is called when the kernel reports an exit
3172 event. This decides whether to report the event to GDB as a
3173 process exit event, a thread exit event, or to suppress the
3177 filter_exit_event (struct lwp_info
*event_child
,
3178 struct target_waitstatus
*ourstatus
)
3180 struct thread_info
*thread
= get_lwp_thread (event_child
);
3181 ptid_t ptid
= ptid_of (thread
);
3183 if (!last_thread_of_process_p (pid_of (thread
)))
3185 if (report_thread_events
)
3186 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3188 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3190 delete_lwp (event_child
);
3195 /* Returns 1 if GDB is interested in any event_child syscalls. */
3198 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3200 struct thread_info
*thread
= get_lwp_thread (event_child
);
3201 struct process_info
*proc
= get_thread_process (thread
);
3203 return !VEC_empty (int, proc
->syscalls_to_catch
);
3206 /* Returns 1 if GDB is interested in the event_child syscall.
3207 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3210 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3214 struct thread_info
*thread
= get_lwp_thread (event_child
);
3215 struct process_info
*proc
= get_thread_process (thread
);
3217 if (VEC_empty (int, proc
->syscalls_to_catch
))
3220 if (VEC_index (int, proc
->syscalls_to_catch
, 0) == ANY_SYSCALL
)
3223 get_syscall_trapinfo (event_child
, &sysno
);
3225 VEC_iterate (int, proc
->syscalls_to_catch
, i
, iter
);
3233 /* Wait for process, returns status. */
3236 linux_wait_1 (ptid_t ptid
,
3237 struct target_waitstatus
*ourstatus
, int target_options
)
3240 struct lwp_info
*event_child
;
3243 int step_over_finished
;
3244 int bp_explains_trap
;
3245 int maybe_internal_trap
;
3254 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3257 /* Translate generic target options into linux options. */
3259 if (target_options
& TARGET_WNOHANG
)
3262 bp_explains_trap
= 0;
3265 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3267 /* Find a resumed LWP, if any. */
3268 if (find_inferior (&all_threads
,
3269 status_pending_p_callback
,
3270 &minus_one_ptid
) != NULL
)
3272 else if ((find_inferior (&all_threads
,
3273 not_stopped_callback
,
3274 &minus_one_ptid
) != NULL
))
3279 if (ptid_equal (step_over_bkpt
, null_ptid
))
3280 pid
= linux_wait_for_event (ptid
, &w
, options
);
3284 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3285 target_pid_to_str (step_over_bkpt
));
3286 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3289 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3291 gdb_assert (target_options
& TARGET_WNOHANG
);
3295 debug_printf ("linux_wait_1 ret = null_ptid, "
3296 "TARGET_WAITKIND_IGNORE\n");
3300 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3307 debug_printf ("linux_wait_1 ret = null_ptid, "
3308 "TARGET_WAITKIND_NO_RESUMED\n");
3312 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3316 event_child
= get_thread_lwp (current_thread
);
3318 /* linux_wait_for_event only returns an exit status for the last
3319 child of a process. Report it. */
3320 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3324 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3325 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3329 debug_printf ("linux_wait_1 ret = %s, exited with "
3331 target_pid_to_str (ptid_of (current_thread
)),
3338 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3339 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3343 debug_printf ("linux_wait_1 ret = %s, terminated with "
3345 target_pid_to_str (ptid_of (current_thread
)),
3351 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3352 return filter_exit_event (event_child
, ourstatus
);
3354 return ptid_of (current_thread
);
3357 /* If step-over executes a breakpoint instruction, in the case of a
3358 hardware single step it means a gdb/gdbserver breakpoint had been
3359 planted on top of a permanent breakpoint, in the case of a software
3360 single step it may just mean that gdbserver hit the reinsert breakpoint.
3361 The PC has been adjusted by save_stop_reason to point at
3362 the breakpoint address.
3363 So in the case of the hardware single step advance the PC manually
3364 past the breakpoint and in the case of software single step advance only
3365 if it's not the single_step_breakpoint we are hitting.
3366 This avoids that a program would keep trapping a permanent breakpoint
3368 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3369 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3370 && (event_child
->stepping
3371 || !single_step_breakpoint_inserted_here (event_child
->stop_pc
)))
3373 int increment_pc
= 0;
3374 int breakpoint_kind
= 0;
3375 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3378 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3379 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3383 debug_printf ("step-over for %s executed software breakpoint\n",
3384 target_pid_to_str (ptid_of (current_thread
)));
3387 if (increment_pc
!= 0)
3389 struct regcache
*regcache
3390 = get_thread_regcache (current_thread
, 1);
3392 event_child
->stop_pc
+= increment_pc
;
3393 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3395 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3396 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3400 /* If this event was not handled before, and is not a SIGTRAP, we
3401 report it. SIGILL and SIGSEGV are also treated as traps in case
3402 a breakpoint is inserted at the current PC. If this target does
3403 not support internal breakpoints at all, we also report the
3404 SIGTRAP without further processing; it's of no concern to us. */
3406 = (supports_breakpoints ()
3407 && (WSTOPSIG (w
) == SIGTRAP
3408 || ((WSTOPSIG (w
) == SIGILL
3409 || WSTOPSIG (w
) == SIGSEGV
)
3410 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3412 if (maybe_internal_trap
)
3414 /* Handle anything that requires bookkeeping before deciding to
3415 report the event or continue waiting. */
3417 /* First check if we can explain the SIGTRAP with an internal
3418 breakpoint, or if we should possibly report the event to GDB.
3419 Do this before anything that may remove or insert a
3421 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3423 /* We have a SIGTRAP, possibly a step-over dance has just
3424 finished. If so, tweak the state machine accordingly,
3425 reinsert breakpoints and delete any single-step
3427 step_over_finished
= finish_step_over (event_child
);
3429 /* Now invoke the callbacks of any internal breakpoints there. */
3430 check_breakpoints (event_child
->stop_pc
);
3432 /* Handle tracepoint data collecting. This may overflow the
3433 trace buffer, and cause a tracing stop, removing
3435 trace_event
= handle_tracepoints (event_child
);
3437 if (bp_explains_trap
)
3440 debug_printf ("Hit a gdbserver breakpoint.\n");
3445 /* We have some other signal, possibly a step-over dance was in
3446 progress, and it should be cancelled too. */
3447 step_over_finished
= finish_step_over (event_child
);
3450 /* We have all the data we need. Either report the event to GDB, or
3451 resume threads and keep waiting for more. */
3453 /* If we're collecting a fast tracepoint, finish the collection and
3454 move out of the jump pad before delivering a signal. See
3455 linux_stabilize_threads. */
3458 && WSTOPSIG (w
) != SIGTRAP
3459 && supports_fast_tracepoints ()
3460 && agent_loaded_p ())
3463 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3464 "to defer or adjust it.\n",
3465 WSTOPSIG (w
), lwpid_of (current_thread
));
3467 /* Allow debugging the jump pad itself. */
3468 if (current_thread
->last_resume_kind
!= resume_step
3469 && maybe_move_out_of_jump_pad (event_child
, &w
))
3471 enqueue_one_deferred_signal (event_child
, &w
);
3474 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3475 WSTOPSIG (w
), lwpid_of (current_thread
));
3477 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3481 return ignore_event (ourstatus
);
3485 if (event_child
->collecting_fast_tracepoint
3486 != fast_tpoint_collect_result::not_collecting
)
3489 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3490 "Check if we're already there.\n",
3491 lwpid_of (current_thread
),
3492 (int) event_child
->collecting_fast_tracepoint
);
3496 event_child
->collecting_fast_tracepoint
3497 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3499 if (event_child
->collecting_fast_tracepoint
3500 != fast_tpoint_collect_result::before_insn
)
3502 /* No longer need this breakpoint. */
3503 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3506 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3507 "stopping all threads momentarily.\n");
3509 /* Other running threads could hit this breakpoint.
3510 We don't handle moribund locations like GDB does,
3511 instead we always pause all threads when removing
3512 breakpoints, so that any step-over or
3513 decr_pc_after_break adjustment is always taken
3514 care of while the breakpoint is still
3516 stop_all_lwps (1, event_child
);
3518 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3519 event_child
->exit_jump_pad_bkpt
= NULL
;
3521 unstop_all_lwps (1, event_child
);
3523 gdb_assert (event_child
->suspended
>= 0);
3527 if (event_child
->collecting_fast_tracepoint
3528 == fast_tpoint_collect_result::not_collecting
)
3531 debug_printf ("fast tracepoint finished "
3532 "collecting successfully.\n");
3534 /* We may have a deferred signal to report. */
3535 if (dequeue_one_deferred_signal (event_child
, &w
))
3538 debug_printf ("dequeued one signal.\n");
3543 debug_printf ("no deferred signals.\n");
3545 if (stabilizing_threads
)
3547 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3548 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3552 debug_printf ("linux_wait_1 ret = %s, stopped "
3553 "while stabilizing threads\n",
3554 target_pid_to_str (ptid_of (current_thread
)));
3558 return ptid_of (current_thread
);
3564 /* Check whether GDB would be interested in this event. */
3566 /* Check if GDB is interested in this syscall. */
3568 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3569 && !gdb_catch_this_syscall_p (event_child
))
3573 debug_printf ("Ignored syscall for LWP %ld.\n",
3574 lwpid_of (current_thread
));
3577 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3582 return ignore_event (ourstatus
);
3585 /* If GDB is not interested in this signal, don't stop other
3586 threads, and don't report it to GDB. Just resume the inferior
3587 right away. We do this for threading-related signals as well as
3588 any that GDB specifically requested we ignore. But never ignore
3589 SIGSTOP if we sent it ourselves, and do not ignore signals when
3590 stepping - they may require special handling to skip the signal
3591 handler. Also never ignore signals that could be caused by a
3594 && current_thread
->last_resume_kind
!= resume_step
3596 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3597 (current_process ()->priv
->thread_db
!= NULL
3598 && (WSTOPSIG (w
) == __SIGRTMIN
3599 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3602 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3603 && !(WSTOPSIG (w
) == SIGSTOP
3604 && current_thread
->last_resume_kind
== resume_stop
)
3605 && !linux_wstatus_maybe_breakpoint (w
))))
3607 siginfo_t info
, *info_p
;
3610 debug_printf ("Ignored signal %d for LWP %ld.\n",
3611 WSTOPSIG (w
), lwpid_of (current_thread
));
3613 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3614 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3619 if (step_over_finished
)
3621 /* We cancelled this thread's step-over above. We still
3622 need to unsuspend all other LWPs, and set them back
3623 running again while the signal handler runs. */
3624 unsuspend_all_lwps (event_child
);
3626 /* Enqueue the pending signal info so that proceed_all_lwps
3628 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3630 proceed_all_lwps ();
3634 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3635 WSTOPSIG (w
), info_p
);
3641 return ignore_event (ourstatus
);
3644 /* Note that all addresses are always "out of the step range" when
3645 there's no range to begin with. */
3646 in_step_range
= lwp_in_step_range (event_child
);
3648 /* If GDB wanted this thread to single step, and the thread is out
3649 of the step range, we always want to report the SIGTRAP, and let
3650 GDB handle it. Watchpoints should always be reported. So should
3651 signals we can't explain. A SIGTRAP we can't explain could be a
3652 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3653 do, we're be able to handle GDB breakpoints on top of internal
3654 breakpoints, by handling the internal breakpoint and still
3655 reporting the event to GDB. If we don't, we're out of luck, GDB
3656 won't see the breakpoint hit. If we see a single-step event but
3657 the thread should be continuing, don't pass the trap to gdb.
3658 That indicates that we had previously finished a single-step but
3659 left the single-step pending -- see
3660 complete_ongoing_step_over. */
3661 report_to_gdb
= (!maybe_internal_trap
3662 || (current_thread
->last_resume_kind
== resume_step
3664 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3666 && !bp_explains_trap
3668 && !step_over_finished
3669 && !(current_thread
->last_resume_kind
== resume_continue
3670 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3671 || (gdb_breakpoint_here (event_child
->stop_pc
)
3672 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3673 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3674 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3676 run_breakpoint_commands (event_child
->stop_pc
);
3678 /* We found no reason GDB would want us to stop. We either hit one
3679 of our own breakpoints, or finished an internal step GDB
3680 shouldn't know about. */
3685 if (bp_explains_trap
)
3686 debug_printf ("Hit a gdbserver breakpoint.\n");
3687 if (step_over_finished
)
3688 debug_printf ("Step-over finished.\n");
3690 debug_printf ("Tracepoint event.\n");
3691 if (lwp_in_step_range (event_child
))
3692 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3693 paddress (event_child
->stop_pc
),
3694 paddress (event_child
->step_range_start
),
3695 paddress (event_child
->step_range_end
));
3698 /* We're not reporting this breakpoint to GDB, so apply the
3699 decr_pc_after_break adjustment to the inferior's regcache
3702 if (the_low_target
.set_pc
!= NULL
)
3704 struct regcache
*regcache
3705 = get_thread_regcache (current_thread
, 1);
3706 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3709 if (step_over_finished
)
3711 /* If we have finished stepping over a breakpoint, we've
3712 stopped and suspended all LWPs momentarily except the
3713 stepping one. This is where we resume them all again.
3714 We're going to keep waiting, so use proceed, which
3715 handles stepping over the next breakpoint. */
3716 unsuspend_all_lwps (event_child
);
3720 /* Remove the single-step breakpoints if any. Note that
3721 there isn't single-step breakpoint if we finished stepping
3723 if (can_software_single_step ()
3724 && has_single_step_breakpoints (current_thread
))
3726 stop_all_lwps (0, event_child
);
3727 delete_single_step_breakpoints (current_thread
);
3728 unstop_all_lwps (0, event_child
);
3733 debug_printf ("proceeding all threads.\n");
3734 proceed_all_lwps ();
3739 return ignore_event (ourstatus
);
3744 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3747 = target_waitstatus_to_string (&event_child
->waitstatus
);
3749 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3750 lwpid_of (get_lwp_thread (event_child
)), str
.c_str ());
3752 if (current_thread
->last_resume_kind
== resume_step
)
3754 if (event_child
->step_range_start
== event_child
->step_range_end
)
3755 debug_printf ("GDB wanted to single-step, reporting event.\n");
3756 else if (!lwp_in_step_range (event_child
))
3757 debug_printf ("Out of step range, reporting event.\n");
3759 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3760 debug_printf ("Stopped by watchpoint.\n");
3761 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3762 debug_printf ("Stopped by GDB breakpoint.\n");
3764 debug_printf ("Hit a non-gdbserver trap event.\n");
3767 /* Alright, we're going to report a stop. */
3769 /* Remove single-step breakpoints. */
3770 if (can_software_single_step ())
3772 /* Remove single-step breakpoints or not. It it is true, stop all
3773 lwps, so that other threads won't hit the breakpoint in the
3775 int remove_single_step_breakpoints_p
= 0;
3779 remove_single_step_breakpoints_p
3780 = has_single_step_breakpoints (current_thread
);
3784 /* In all-stop, a stop reply cancels all previous resume
3785 requests. Delete all single-step breakpoints. */
3786 struct inferior_list_entry
*inf
, *tmp
;
3788 ALL_INFERIORS (&all_threads
, inf
, tmp
)
3790 struct thread_info
*thread
= (struct thread_info
*) inf
;
3792 if (has_single_step_breakpoints (thread
))
3794 remove_single_step_breakpoints_p
= 1;
3800 if (remove_single_step_breakpoints_p
)
3802 /* If we remove single-step breakpoints from memory, stop all lwps,
3803 so that other threads won't hit the breakpoint in the staled
3805 stop_all_lwps (0, event_child
);
3809 gdb_assert (has_single_step_breakpoints (current_thread
));
3810 delete_single_step_breakpoints (current_thread
);
3814 struct inferior_list_entry
*inf
, *tmp
;
3816 ALL_INFERIORS (&all_threads
, inf
, tmp
)
3818 struct thread_info
*thread
= (struct thread_info
*) inf
;
3820 if (has_single_step_breakpoints (thread
))
3821 delete_single_step_breakpoints (thread
);
3825 unstop_all_lwps (0, event_child
);
3829 if (!stabilizing_threads
)
3831 /* In all-stop, stop all threads. */
3833 stop_all_lwps (0, NULL
);
3835 if (step_over_finished
)
3839 /* If we were doing a step-over, all other threads but
3840 the stepping one had been paused in start_step_over,
3841 with their suspend counts incremented. We don't want
3842 to do a full unstop/unpause, because we're in
3843 all-stop mode (so we want threads stopped), but we
3844 still need to unsuspend the other threads, to
3845 decrement their `suspended' count back. */
3846 unsuspend_all_lwps (event_child
);
3850 /* If we just finished a step-over, then all threads had
3851 been momentarily paused. In all-stop, that's fine,
3852 we want threads stopped by now anyway. In non-stop,
3853 we need to re-resume threads that GDB wanted to be
3855 unstop_all_lwps (1, event_child
);
3859 /* If we're not waiting for a specific LWP, choose an event LWP
3860 from among those that have had events. Giving equal priority
3861 to all LWPs that have had events helps prevent
3863 if (ptid_equal (ptid
, minus_one_ptid
))
3865 event_child
->status_pending_p
= 1;
3866 event_child
->status_pending
= w
;
3868 select_event_lwp (&event_child
);
3870 /* current_thread and event_child must stay in sync. */
3871 current_thread
= get_lwp_thread (event_child
);
3873 event_child
->status_pending_p
= 0;
3874 w
= event_child
->status_pending
;
3878 /* Stabilize threads (move out of jump pads). */
3880 stabilize_threads ();
3884 /* If we just finished a step-over, then all threads had been
3885 momentarily paused. In all-stop, that's fine, we want
3886 threads stopped by now anyway. In non-stop, we need to
3887 re-resume threads that GDB wanted to be running. */
3888 if (step_over_finished
)
3889 unstop_all_lwps (1, event_child
);
3892 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3894 /* If the reported event is an exit, fork, vfork or exec, let
3897 /* Break the unreported fork relationship chain. */
3898 if (event_child
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
3899 || event_child
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
)
3901 event_child
->fork_relative
->fork_relative
= NULL
;
3902 event_child
->fork_relative
= NULL
;
3905 *ourstatus
= event_child
->waitstatus
;
3906 /* Clear the event lwp's waitstatus since we handled it already. */
3907 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3910 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3912 /* Now that we've selected our final event LWP, un-adjust its PC if
3913 it was a software breakpoint, and the client doesn't know we can
3914 adjust the breakpoint ourselves. */
3915 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3916 && !swbreak_feature
)
3918 int decr_pc
= the_low_target
.decr_pc_after_break
;
3922 struct regcache
*regcache
3923 = get_thread_regcache (current_thread
, 1);
3924 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3928 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3930 get_syscall_trapinfo (event_child
,
3931 &ourstatus
->value
.syscall_number
);
3932 ourstatus
->kind
= event_child
->syscall_state
;
3934 else if (current_thread
->last_resume_kind
== resume_stop
3935 && WSTOPSIG (w
) == SIGSTOP
)
3937 /* A thread that has been requested to stop by GDB with vCont;t,
3938 and it stopped cleanly, so report as SIG0. The use of
3939 SIGSTOP is an implementation detail. */
3940 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3942 else if (current_thread
->last_resume_kind
== resume_stop
3943 && WSTOPSIG (w
) != SIGSTOP
)
3945 /* A thread that has been requested to stop by GDB with vCont;t,
3946 but, it stopped for other reasons. */
3947 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3949 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3951 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3954 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3958 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3959 target_pid_to_str (ptid_of (current_thread
)),
3960 ourstatus
->kind
, ourstatus
->value
.sig
);
3964 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3965 return filter_exit_event (event_child
, ourstatus
);
3967 return ptid_of (current_thread
);
3970 /* Get rid of any pending event in the pipe. */
3972 async_file_flush (void)
3978 ret
= read (linux_event_pipe
[0], &buf
, 1);
3979 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3982 /* Put something in the pipe, so the event loop wakes up. */
3984 async_file_mark (void)
3988 async_file_flush ();
3991 ret
= write (linux_event_pipe
[1], "+", 1);
3992 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3994 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3995 be awakened anyway. */
3999 linux_wait (ptid_t ptid
,
4000 struct target_waitstatus
*ourstatus
, int target_options
)
4004 /* Flush the async file first. */
4005 if (target_is_async_p ())
4006 async_file_flush ();
4010 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
4012 while ((target_options
& TARGET_WNOHANG
) == 0
4013 && ptid_equal (event_ptid
, null_ptid
)
4014 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
4016 /* If at least one stop was reported, there may be more. A single
4017 SIGCHLD can signal more than one child stop. */
4018 if (target_is_async_p ()
4019 && (target_options
& TARGET_WNOHANG
) != 0
4020 && !ptid_equal (event_ptid
, null_ptid
))
4026 /* Send a signal to an LWP. */
4029 kill_lwp (unsigned long lwpid
, int signo
)
4034 ret
= syscall (__NR_tkill
, lwpid
, signo
);
4035 if (errno
== ENOSYS
)
4037 /* If tkill fails, then we are not using nptl threads, a
4038 configuration we no longer support. */
4039 perror_with_name (("tkill"));
4045 linux_stop_lwp (struct lwp_info
*lwp
)
4051 send_sigstop (struct lwp_info
*lwp
)
4055 pid
= lwpid_of (get_lwp_thread (lwp
));
4057 /* If we already have a pending stop signal for this process, don't
4059 if (lwp
->stop_expected
)
4062 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
4068 debug_printf ("Sending sigstop to lwp %d\n", pid
);
4070 lwp
->stop_expected
= 1;
4071 kill_lwp (pid
, SIGSTOP
);
4075 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
4077 struct thread_info
*thread
= (struct thread_info
*) entry
;
4078 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4080 /* Ignore EXCEPT. */
4091 /* Increment the suspend count of an LWP, and stop it, if not stopped
4094 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
4097 struct thread_info
*thread
= (struct thread_info
*) entry
;
4098 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4100 /* Ignore EXCEPT. */
4104 lwp_suspended_inc (lwp
);
4106 return send_sigstop_callback (entry
, except
);
4110 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
4112 /* Store the exit status for later. */
4113 lwp
->status_pending_p
= 1;
4114 lwp
->status_pending
= wstat
;
4116 /* Store in waitstatus as well, as there's nothing else to process
4118 if (WIFEXITED (wstat
))
4120 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
4121 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
4123 else if (WIFSIGNALED (wstat
))
4125 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
4126 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
4129 /* Prevent trying to stop it. */
4132 /* No further stops are expected from a dead lwp. */
4133 lwp
->stop_expected
= 0;
4136 /* Return true if LWP has exited already, and has a pending exit event
4137 to report to GDB. */
4140 lwp_is_marked_dead (struct lwp_info
*lwp
)
4142 return (lwp
->status_pending_p
4143 && (WIFEXITED (lwp
->status_pending
)
4144 || WIFSIGNALED (lwp
->status_pending
)));
4147 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4150 wait_for_sigstop (void)
4152 struct thread_info
*saved_thread
;
4157 saved_thread
= current_thread
;
4158 if (saved_thread
!= NULL
)
4159 saved_tid
= saved_thread
->entry
.id
;
4161 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4164 debug_printf ("wait_for_sigstop: pulling events\n");
4166 /* Passing NULL_PTID as filter indicates we want all events to be
4167 left pending. Eventually this returns when there are no
4168 unwaited-for children left. */
4169 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4171 gdb_assert (ret
== -1);
4173 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4174 current_thread
= saved_thread
;
4178 debug_printf ("Previously current thread died.\n");
4180 /* We can't change the current inferior behind GDB's back,
4181 otherwise, a subsequent command may apply to the wrong
4183 current_thread
= NULL
;
4187 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
4188 move it out, because we need to report the stop event to GDB. For
4189 example, if the user puts a breakpoint in the jump pad, it's
4190 because she wants to debug it. */
4193 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
4195 struct thread_info
*thread
= (struct thread_info
*) entry
;
4196 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4198 if (lwp
->suspended
!= 0)
4200 internal_error (__FILE__
, __LINE__
,
4201 "LWP %ld is suspended, suspended=%d\n",
4202 lwpid_of (thread
), lwp
->suspended
);
4204 gdb_assert (lwp
->stopped
);
4206 /* Allow debugging the jump pad, gdb_collect, etc.. */
4207 return (supports_fast_tracepoints ()
4208 && agent_loaded_p ()
4209 && (gdb_breakpoint_here (lwp
->stop_pc
)
4210 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4211 || thread
->last_resume_kind
== resume_step
)
4212 && (linux_fast_tracepoint_collecting (lwp
, NULL
)
4213 != fast_tpoint_collect_result::not_collecting
));
4217 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
4219 struct thread_info
*thread
= (struct thread_info
*) entry
;
4220 struct thread_info
*saved_thread
;
4221 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4224 if (lwp
->suspended
!= 0)
4226 internal_error (__FILE__
, __LINE__
,
4227 "LWP %ld is suspended, suspended=%d\n",
4228 lwpid_of (thread
), lwp
->suspended
);
4230 gdb_assert (lwp
->stopped
);
4232 /* For gdb_breakpoint_here. */
4233 saved_thread
= current_thread
;
4234 current_thread
= thread
;
4236 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4238 /* Allow debugging the jump pad, gdb_collect, etc. */
4239 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4240 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4241 && thread
->last_resume_kind
!= resume_step
4242 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4245 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4250 lwp
->status_pending_p
= 0;
4251 enqueue_one_deferred_signal (lwp
, wstat
);
4254 debug_printf ("Signal %d for LWP %ld deferred "
4256 WSTOPSIG (*wstat
), lwpid_of (thread
));
4259 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4262 lwp_suspended_inc (lwp
);
4264 current_thread
= saved_thread
;
4268 lwp_running (struct inferior_list_entry
*entry
, void *data
)
4270 struct thread_info
*thread
= (struct thread_info
*) entry
;
4271 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4273 if (lwp_is_marked_dead (lwp
))
4280 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4281 If SUSPEND, then also increase the suspend count of every LWP,
4285 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4287 /* Should not be called recursively. */
4288 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4293 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4294 suspend
? "stop-and-suspend" : "stop",
4296 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4300 stopping_threads
= (suspend
4301 ? STOPPING_AND_SUSPENDING_THREADS
4302 : STOPPING_THREADS
);
4305 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
4307 find_inferior (&all_threads
, send_sigstop_callback
, except
);
4308 wait_for_sigstop ();
4309 stopping_threads
= NOT_STOPPING_THREADS
;
4313 debug_printf ("stop_all_lwps done, setting stopping_threads "
4314 "back to !stopping\n");
4319 /* Enqueue one signal in the chain of signals which need to be
4320 delivered to this process on next resume. */
4323 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4325 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4327 p_sig
->prev
= lwp
->pending_signals
;
4328 p_sig
->signal
= signal
;
4330 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4332 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4333 lwp
->pending_signals
= p_sig
;
4336 /* Install breakpoints for software single stepping. */
4339 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4341 struct thread_info
*thread
= get_lwp_thread (lwp
);
4342 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4343 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
4345 current_thread
= thread
;
4346 std::vector
<CORE_ADDR
> next_pcs
= the_low_target
.get_next_pcs (regcache
);
4348 for (CORE_ADDR pc
: next_pcs
)
4349 set_single_step_breakpoint (pc
, current_ptid
);
4351 do_cleanups (old_chain
);
4354 /* Single step via hardware or software single step.
4355 Return 1 if hardware single stepping, 0 if software single stepping
4356 or can't single step. */
4359 single_step (struct lwp_info
* lwp
)
4363 if (can_hardware_single_step ())
4367 else if (can_software_single_step ())
4369 install_software_single_step_breakpoints (lwp
);
4375 debug_printf ("stepping is not implemented on this target");
4381 /* The signal can be delivered to the inferior if we are not trying to
4382 finish a fast tracepoint collect. Since signal can be delivered in
4383 the step-over, the program may go to signal handler and trap again
4384 after return from the signal handler. We can live with the spurious
4388 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4390 return (lwp
->collecting_fast_tracepoint
4391 == fast_tpoint_collect_result::not_collecting
);
4394 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4395 SIGNAL is nonzero, give it that signal. */
4398 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4399 int step
, int signal
, siginfo_t
*info
)
4401 struct thread_info
*thread
= get_lwp_thread (lwp
);
4402 struct thread_info
*saved_thread
;
4404 struct process_info
*proc
= get_thread_process (thread
);
4406 /* Note that target description may not be initialised
4407 (proc->tdesc == NULL) at this point because the program hasn't
4408 stopped at the first instruction yet. It means GDBserver skips
4409 the extra traps from the wrapper program (see option --wrapper).
4410 Code in this function that requires register access should be
4411 guarded by proc->tdesc == NULL or something else. */
4413 if (lwp
->stopped
== 0)
4416 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4418 fast_tpoint_collect_result fast_tp_collecting
4419 = lwp
->collecting_fast_tracepoint
;
4421 gdb_assert (!stabilizing_threads
4422 || (fast_tp_collecting
4423 != fast_tpoint_collect_result::not_collecting
));
4425 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4426 user used the "jump" command, or "set $pc = foo"). */
4427 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4429 /* Collecting 'while-stepping' actions doesn't make sense
4431 release_while_stepping_state_list (thread
);
4434 /* If we have pending signals or status, and a new signal, enqueue the
4435 signal. Also enqueue the signal if it can't be delivered to the
4436 inferior right now. */
4438 && (lwp
->status_pending_p
4439 || lwp
->pending_signals
!= NULL
4440 || !lwp_signal_can_be_delivered (lwp
)))
4442 enqueue_pending_signal (lwp
, signal
, info
);
4444 /* Postpone any pending signal. It was enqueued above. */
4448 if (lwp
->status_pending_p
)
4451 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4452 " has pending status\n",
4453 lwpid_of (thread
), step
? "step" : "continue",
4454 lwp
->stop_expected
? "expected" : "not expected");
4458 saved_thread
= current_thread
;
4459 current_thread
= thread
;
4461 /* This bit needs some thinking about. If we get a signal that
4462 we must report while a single-step reinsert is still pending,
4463 we often end up resuming the thread. It might be better to
4464 (ew) allow a stack of pending events; then we could be sure that
4465 the reinsert happened right away and not lose any signals.
4467 Making this stack would also shrink the window in which breakpoints are
4468 uninserted (see comment in linux_wait_for_lwp) but not enough for
4469 complete correctness, so it won't solve that problem. It may be
4470 worthwhile just to solve this one, however. */
4471 if (lwp
->bp_reinsert
!= 0)
4474 debug_printf (" pending reinsert at 0x%s\n",
4475 paddress (lwp
->bp_reinsert
));
4477 if (can_hardware_single_step ())
4479 if (fast_tp_collecting
== fast_tpoint_collect_result::not_collecting
)
4482 warning ("BAD - reinserting but not stepping.");
4484 warning ("BAD - reinserting and suspended(%d).",
4489 step
= maybe_hw_step (thread
);
4492 if (fast_tp_collecting
== fast_tpoint_collect_result::before_insn
)
4495 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4496 " (exit-jump-pad-bkpt)\n",
4499 else if (fast_tp_collecting
== fast_tpoint_collect_result::at_insn
)
4502 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4503 " single-stepping\n",
4506 if (can_hardware_single_step ())
4510 internal_error (__FILE__
, __LINE__
,
4511 "moving out of jump pad single-stepping"
4512 " not implemented on this target");
4516 /* If we have while-stepping actions in this thread set it stepping.
4517 If we have a signal to deliver, it may or may not be set to
4518 SIG_IGN, we don't know. Assume so, and allow collecting
4519 while-stepping into a signal handler. A possible smart thing to
4520 do would be to set an internal breakpoint at the signal return
4521 address, continue, and carry on catching this while-stepping
4522 action only when that breakpoint is hit. A future
4524 if (thread
->while_stepping
!= NULL
)
4527 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4530 step
= single_step (lwp
);
4533 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4535 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4537 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4541 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4542 (long) lwp
->stop_pc
);
4546 /* If we have pending signals, consume one if it can be delivered to
4548 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4550 struct pending_signals
**p_sig
;
4552 p_sig
= &lwp
->pending_signals
;
4553 while ((*p_sig
)->prev
!= NULL
)
4554 p_sig
= &(*p_sig
)->prev
;
4556 signal
= (*p_sig
)->signal
;
4557 if ((*p_sig
)->info
.si_signo
!= 0)
4558 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4566 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4567 lwpid_of (thread
), step
? "step" : "continue", signal
,
4568 lwp
->stop_expected
? "expected" : "not expected");
4570 if (the_low_target
.prepare_to_resume
!= NULL
)
4571 the_low_target
.prepare_to_resume (lwp
);
4573 regcache_invalidate_thread (thread
);
4575 lwp
->stepping
= step
;
4577 ptrace_request
= PTRACE_SINGLESTEP
;
4578 else if (gdb_catching_syscalls_p (lwp
))
4579 ptrace_request
= PTRACE_SYSCALL
;
4581 ptrace_request
= PTRACE_CONT
;
4582 ptrace (ptrace_request
,
4584 (PTRACE_TYPE_ARG3
) 0,
4585 /* Coerce to a uintptr_t first to avoid potential gcc warning
4586 of coercing an 8 byte integer to a 4 byte pointer. */
4587 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4589 current_thread
= saved_thread
;
4591 perror_with_name ("resuming thread");
4593 /* Successfully resumed. Clear state that no longer makes sense,
4594 and mark the LWP as running. Must not do this before resuming
4595 otherwise if that fails other code will be confused. E.g., we'd
4596 later try to stop the LWP and hang forever waiting for a stop
4597 status. Note that we must not throw after this is cleared,
4598 otherwise handle_zombie_lwp_error would get confused. */
4600 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4603 /* Called when we try to resume a stopped LWP and that errors out. If
4604 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4605 or about to become), discard the error, clear any pending status
4606 the LWP may have, and return true (we'll collect the exit status
4607 soon enough). Otherwise, return false. */
4610 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4612 struct thread_info
*thread
= get_lwp_thread (lp
);
4614 /* If we get an error after resuming the LWP successfully, we'd
4615 confuse !T state for the LWP being gone. */
4616 gdb_assert (lp
->stopped
);
4618 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4619 because even if ptrace failed with ESRCH, the tracee may be "not
4620 yet fully dead", but already refusing ptrace requests. In that
4621 case the tracee has 'R (Running)' state for a little bit
4622 (observed in Linux 3.18). See also the note on ESRCH in the
4623 ptrace(2) man page. Instead, check whether the LWP has any state
4624 other than ptrace-stopped. */
4626 /* Don't assume anything if /proc/PID/status can't be read. */
4627 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4629 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4630 lp
->status_pending_p
= 0;
4636 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4637 disappears while we try to resume it. */
4640 linux_resume_one_lwp (struct lwp_info
*lwp
,
4641 int step
, int signal
, siginfo_t
*info
)
4645 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4647 CATCH (ex
, RETURN_MASK_ERROR
)
4649 if (!check_ptrace_stopped_lwp_gone (lwp
))
4650 throw_exception (ex
);
4655 struct thread_resume_array
4657 struct thread_resume
*resume
;
4661 /* This function is called once per thread via find_inferior.
4662 ARG is a pointer to a thread_resume_array struct.
4663 We look up the thread specified by ENTRY in ARG, and mark the thread
4664 with a pointer to the appropriate resume request.
4666 This algorithm is O(threads * resume elements), but resume elements
4667 is small (and will remain small at least until GDB supports thread
4671 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
4673 struct thread_info
*thread
= (struct thread_info
*) entry
;
4674 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4676 struct thread_resume_array
*r
;
4678 r
= (struct thread_resume_array
*) arg
;
4680 for (ndx
= 0; ndx
< r
->n
; ndx
++)
4682 ptid_t ptid
= r
->resume
[ndx
].thread
;
4683 if (ptid_equal (ptid
, minus_one_ptid
)
4684 || ptid_equal (ptid
, entry
->id
)
4685 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4687 || (ptid_get_pid (ptid
) == pid_of (thread
)
4688 && (ptid_is_pid (ptid
)
4689 || ptid_get_lwp (ptid
) == -1)))
4691 if (r
->resume
[ndx
].kind
== resume_stop
4692 && thread
->last_resume_kind
== resume_stop
)
4695 debug_printf ("already %s LWP %ld at GDB's request\n",
4696 (thread
->last_status
.kind
4697 == TARGET_WAITKIND_STOPPED
)
4705 /* Ignore (wildcard) resume requests for already-resumed
4707 if (r
->resume
[ndx
].kind
!= resume_stop
4708 && thread
->last_resume_kind
!= resume_stop
)
4711 debug_printf ("already %s LWP %ld at GDB's request\n",
4712 (thread
->last_resume_kind
4720 /* Don't let wildcard resumes resume fork children that GDB
4721 does not yet know are new fork children. */
4722 if (lwp
->fork_relative
!= NULL
)
4724 struct lwp_info
*rel
= lwp
->fork_relative
;
4726 if (rel
->status_pending_p
4727 && (rel
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
4728 || rel
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
))
4731 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4737 /* If the thread has a pending event that has already been
4738 reported to GDBserver core, but GDB has not pulled the
4739 event out of the vStopped queue yet, likewise, ignore the
4740 (wildcard) resume request. */
4741 if (in_queued_stop_replies (entry
->id
))
4744 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4749 lwp
->resume
= &r
->resume
[ndx
];
4750 thread
->last_resume_kind
= lwp
->resume
->kind
;
4752 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4753 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4755 /* If we had a deferred signal to report, dequeue one now.
4756 This can happen if LWP gets more than one signal while
4757 trying to get out of a jump pad. */
4759 && !lwp
->status_pending_p
4760 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4762 lwp
->status_pending_p
= 1;
4765 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4766 "leaving status pending.\n",
4767 WSTOPSIG (lwp
->status_pending
),
4775 /* No resume action for this thread. */
4781 /* find_inferior callback for linux_resume.
4782 Set *FLAG_P if this lwp has an interesting status pending. */
4785 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
4787 struct thread_info
*thread
= (struct thread_info
*) entry
;
4788 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4790 /* LWPs which will not be resumed are not interesting, because
4791 we might not wait for them next time through linux_wait. */
4792 if (lwp
->resume
== NULL
)
4795 if (thread_still_has_status_pending_p (thread
))
4796 * (int *) flag_p
= 1;
4801 /* Return 1 if this lwp that GDB wants running is stopped at an
4802 internal breakpoint that we need to step over. It assumes that any
4803 required STOP_PC adjustment has already been propagated to the
4804 inferior's regcache. */
4807 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
4809 struct thread_info
*thread
= (struct thread_info
*) entry
;
4810 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4811 struct thread_info
*saved_thread
;
4813 struct process_info
*proc
= get_thread_process (thread
);
4815 /* GDBserver is skipping the extra traps from the wrapper program,
4816 don't have to do step over. */
4817 if (proc
->tdesc
== NULL
)
4820 /* LWPs which will not be resumed are not interesting, because we
4821 might not wait for them next time through linux_wait. */
4826 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4831 if (thread
->last_resume_kind
== resume_stop
)
4834 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4840 gdb_assert (lwp
->suspended
>= 0);
4845 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4850 if (lwp
->status_pending_p
)
4853 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4859 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4863 /* If the PC has changed since we stopped, then don't do anything,
4864 and let the breakpoint/tracepoint be hit. This happens if, for
4865 instance, GDB handled the decr_pc_after_break subtraction itself,
4866 GDB is OOL stepping this thread, or the user has issued a "jump"
4867 command, or poked thread's registers herself. */
4868 if (pc
!= lwp
->stop_pc
)
4871 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4872 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4874 paddress (lwp
->stop_pc
), paddress (pc
));
4878 /* On software single step target, resume the inferior with signal
4879 rather than stepping over. */
4880 if (can_software_single_step ()
4881 && lwp
->pending_signals
!= NULL
4882 && lwp_signal_can_be_delivered (lwp
))
4885 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4892 saved_thread
= current_thread
;
4893 current_thread
= thread
;
4895 /* We can only step over breakpoints we know about. */
4896 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4898 /* Don't step over a breakpoint that GDB expects to hit
4899 though. If the condition is being evaluated on the target's side
4900 and it evaluate to false, step over this breakpoint as well. */
4901 if (gdb_breakpoint_here (pc
)
4902 && gdb_condition_true_at_breakpoint (pc
)
4903 && gdb_no_commands_at_breakpoint (pc
))
4906 debug_printf ("Need step over [LWP %ld]? yes, but found"
4907 " GDB breakpoint at 0x%s; skipping step over\n",
4908 lwpid_of (thread
), paddress (pc
));
4910 current_thread
= saved_thread
;
4916 debug_printf ("Need step over [LWP %ld]? yes, "
4917 "found breakpoint at 0x%s\n",
4918 lwpid_of (thread
), paddress (pc
));
4920 /* We've found an lwp that needs stepping over --- return 1 so
4921 that find_inferior stops looking. */
4922 current_thread
= saved_thread
;
4928 current_thread
= saved_thread
;
4931 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4933 lwpid_of (thread
), paddress (pc
));
4938 /* Start a step-over operation on LWP. When LWP stopped at a
4939 breakpoint, to make progress, we need to remove the breakpoint out
4940 of the way. If we let other threads run while we do that, they may
4941 pass by the breakpoint location and miss hitting it. To avoid
4942 that, a step-over momentarily stops all threads while LWP is
4943 single-stepped by either hardware or software while the breakpoint
4944 is temporarily uninserted from the inferior. When the single-step
4945 finishes, we reinsert the breakpoint, and let all threads that are
4946 supposed to be running, run again. */
4949 start_step_over (struct lwp_info
*lwp
)
4951 struct thread_info
*thread
= get_lwp_thread (lwp
);
4952 struct thread_info
*saved_thread
;
4957 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4960 stop_all_lwps (1, lwp
);
4962 if (lwp
->suspended
!= 0)
4964 internal_error (__FILE__
, __LINE__
,
4965 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4970 debug_printf ("Done stopping all threads for step-over.\n");
4972 /* Note, we should always reach here with an already adjusted PC,
4973 either by GDB (if we're resuming due to GDB's request), or by our
4974 caller, if we just finished handling an internal breakpoint GDB
4975 shouldn't care about. */
4978 saved_thread
= current_thread
;
4979 current_thread
= thread
;
4981 lwp
->bp_reinsert
= pc
;
4982 uninsert_breakpoints_at (pc
);
4983 uninsert_fast_tracepoint_jumps_at (pc
);
4985 step
= single_step (lwp
);
4987 current_thread
= saved_thread
;
4989 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4991 /* Require next event from this LWP. */
4992 step_over_bkpt
= thread
->entry
.id
;
4996 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4997 start_step_over, if still there, and delete any single-step
4998 breakpoints we've set, on non hardware single-step targets. */
5001 finish_step_over (struct lwp_info
*lwp
)
5003 if (lwp
->bp_reinsert
!= 0)
5005 struct thread_info
*saved_thread
= current_thread
;
5008 debug_printf ("Finished step over.\n");
5010 current_thread
= get_lwp_thread (lwp
);
5012 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
5013 may be no breakpoint to reinsert there by now. */
5014 reinsert_breakpoints_at (lwp
->bp_reinsert
);
5015 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
5017 lwp
->bp_reinsert
= 0;
5019 /* Delete any single-step breakpoints. No longer needed. We
5020 don't have to worry about other threads hitting this trap,
5021 and later not being able to explain it, because we were
5022 stepping over a breakpoint, and we hold all threads but
5023 LWP stopped while doing that. */
5024 if (!can_hardware_single_step ())
5026 gdb_assert (has_single_step_breakpoints (current_thread
));
5027 delete_single_step_breakpoints (current_thread
);
5030 step_over_bkpt
= null_ptid
;
5031 current_thread
= saved_thread
;
5038 /* If there's a step over in progress, wait until all threads stop
5039 (that is, until the stepping thread finishes its step), and
5040 unsuspend all lwps. The stepping thread ends with its status
5041 pending, which is processed later when we get back to processing
5045 complete_ongoing_step_over (void)
5047 if (!ptid_equal (step_over_bkpt
, null_ptid
))
5049 struct lwp_info
*lwp
;
5054 debug_printf ("detach: step over in progress, finish it first\n");
5056 /* Passing NULL_PTID as filter indicates we want all events to
5057 be left pending. Eventually this returns when there are no
5058 unwaited-for children left. */
5059 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
5061 gdb_assert (ret
== -1);
5063 lwp
= find_lwp_pid (step_over_bkpt
);
5065 finish_step_over (lwp
);
5066 step_over_bkpt
= null_ptid
;
5067 unsuspend_all_lwps (lwp
);
5071 /* This function is called once per thread. We check the thread's resume
5072 request, which will tell us whether to resume, step, or leave the thread
5073 stopped; and what signal, if any, it should be sent.
5075 For threads which we aren't explicitly told otherwise, we preserve
5076 the stepping flag; this is used for stepping over gdbserver-placed
5079 If pending_flags was set in any thread, we queue any needed
5080 signals, since we won't actually resume. We already have a pending
5081 event to report, so we don't need to preserve any step requests;
5082 they should be re-issued if necessary. */
5085 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
5087 struct thread_info
*thread
= (struct thread_info
*) entry
;
5088 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5089 int leave_all_stopped
= * (int *) arg
;
5092 if (lwp
->resume
== NULL
)
5095 if (lwp
->resume
->kind
== resume_stop
)
5098 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
5103 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
5105 /* Stop the thread, and wait for the event asynchronously,
5106 through the event loop. */
5112 debug_printf ("already stopped LWP %ld\n",
5115 /* The LWP may have been stopped in an internal event that
5116 was not meant to be notified back to GDB (e.g., gdbserver
5117 breakpoint), so we should be reporting a stop event in
5120 /* If the thread already has a pending SIGSTOP, this is a
5121 no-op. Otherwise, something later will presumably resume
5122 the thread and this will cause it to cancel any pending
5123 operation, due to last_resume_kind == resume_stop. If
5124 the thread already has a pending status to report, we
5125 will still report it the next time we wait - see
5126 status_pending_p_callback. */
5128 /* If we already have a pending signal to report, then
5129 there's no need to queue a SIGSTOP, as this means we're
5130 midway through moving the LWP out of the jumppad, and we
5131 will report the pending signal as soon as that is
5133 if (lwp
->pending_signals_to_report
== NULL
)
5137 /* For stop requests, we're done. */
5139 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5143 /* If this thread which is about to be resumed has a pending status,
5144 then don't resume it - we can just report the pending status.
5145 Likewise if it is suspended, because e.g., another thread is
5146 stepping past a breakpoint. Make sure to queue any signals that
5147 would otherwise be sent. In all-stop mode, we do this decision
5148 based on if *any* thread has a pending status. If there's a
5149 thread that needs the step-over-breakpoint dance, then don't
5150 resume any other thread but that particular one. */
5151 leave_pending
= (lwp
->suspended
5152 || lwp
->status_pending_p
5153 || leave_all_stopped
);
5155 /* If we have a new signal, enqueue the signal. */
5156 if (lwp
->resume
->sig
!= 0)
5158 siginfo_t info
, *info_p
;
5160 /* If this is the same signal we were previously stopped by,
5161 make sure to queue its siginfo. */
5162 if (WIFSTOPPED (lwp
->last_status
)
5163 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
5164 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
5165 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
5170 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
5176 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
5178 proceed_one_lwp (entry
, NULL
);
5183 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5186 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5192 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5194 struct thread_resume_array array
= { resume_info
, n
};
5195 struct thread_info
*need_step_over
= NULL
;
5197 int leave_all_stopped
;
5202 debug_printf ("linux_resume:\n");
5205 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
5207 /* If there is a thread which would otherwise be resumed, which has
5208 a pending status, then don't resume any threads - we can just
5209 report the pending status. Make sure to queue any signals that
5210 would otherwise be sent. In non-stop mode, we'll apply this
5211 logic to each thread individually. We consume all pending events
5212 before considering to start a step-over (in all-stop). */
5215 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
5217 /* If there is a thread which would otherwise be resumed, which is
5218 stopped at a breakpoint that needs stepping over, then don't
5219 resume any threads - have it step over the breakpoint with all
5220 other threads stopped, then resume all threads again. Make sure
5221 to queue any signals that would otherwise be delivered or
5223 if (!any_pending
&& supports_breakpoints ())
5225 = (struct thread_info
*) find_inferior (&all_threads
,
5226 need_step_over_p
, NULL
);
5228 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5232 if (need_step_over
!= NULL
)
5233 debug_printf ("Not resuming all, need step over\n");
5234 else if (any_pending
)
5235 debug_printf ("Not resuming, all-stop and found "
5236 "an LWP with pending status\n");
5238 debug_printf ("Resuming, no pending status or step over needed\n");
5241 /* Even if we're leaving threads stopped, queue all signals we'd
5242 otherwise deliver. */
5243 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
5246 start_step_over (get_thread_lwp (need_step_over
));
5250 debug_printf ("linux_resume done\n");
5254 /* We may have events that were pending that can/should be sent to
5255 the client now. Trigger a linux_wait call. */
5256 if (target_is_async_p ())
5260 /* This function is called once per thread. We check the thread's
5261 last resume request, which will tell us whether to resume, step, or
5262 leave the thread stopped. Any signal the client requested to be
5263 delivered has already been enqueued at this point.
5265 If any thread that GDB wants running is stopped at an internal
5266 breakpoint that needs stepping over, we start a step-over operation
5267 on that particular thread, and leave all others stopped. */
5270 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
5272 struct thread_info
*thread
= (struct thread_info
*) entry
;
5273 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5280 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5285 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5289 if (thread
->last_resume_kind
== resume_stop
5290 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5293 debug_printf (" client wants LWP to remain %ld stopped\n",
5298 if (lwp
->status_pending_p
)
5301 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5306 gdb_assert (lwp
->suspended
>= 0);
5311 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5315 if (thread
->last_resume_kind
== resume_stop
5316 && lwp
->pending_signals_to_report
== NULL
5317 && (lwp
->collecting_fast_tracepoint
5318 == fast_tpoint_collect_result::not_collecting
))
5320 /* We haven't reported this LWP as stopped yet (otherwise, the
5321 last_status.kind check above would catch it, and we wouldn't
5322 reach here. This LWP may have been momentarily paused by a
5323 stop_all_lwps call while handling for example, another LWP's
5324 step-over. In that case, the pending expected SIGSTOP signal
5325 that was queued at vCont;t handling time will have already
5326 been consumed by wait_for_sigstop, and so we need to requeue
5327 another one here. Note that if the LWP already has a SIGSTOP
5328 pending, this is a no-op. */
5331 debug_printf ("Client wants LWP %ld to stop. "
5332 "Making sure it has a SIGSTOP pending\n",
5338 if (thread
->last_resume_kind
== resume_step
)
5341 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5344 /* If resume_step is requested by GDB, install single-step
5345 breakpoints when the thread is about to be actually resumed if
5346 the single-step breakpoints weren't removed. */
5347 if (can_software_single_step ()
5348 && !has_single_step_breakpoints (thread
))
5349 install_software_single_step_breakpoints (lwp
);
5351 step
= maybe_hw_step (thread
);
5353 else if (lwp
->bp_reinsert
!= 0)
5356 debug_printf (" stepping LWP %ld, reinsert set\n",
5359 step
= maybe_hw_step (thread
);
5364 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5369 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
5371 struct thread_info
*thread
= (struct thread_info
*) entry
;
5372 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5377 lwp_suspended_decr (lwp
);
5379 return proceed_one_lwp (entry
, except
);
5382 /* When we finish a step-over, set threads running again. If there's
5383 another thread that may need a step-over, now's the time to start
5384 it. Eventually, we'll move all threads past their breakpoints. */
5387 proceed_all_lwps (void)
5389 struct thread_info
*need_step_over
;
5391 /* If there is a thread which would otherwise be resumed, which is
5392 stopped at a breakpoint that needs stepping over, then don't
5393 resume any threads - have it step over the breakpoint with all
5394 other threads stopped, then resume all threads again. */
5396 if (supports_breakpoints ())
5399 = (struct thread_info
*) find_inferior (&all_threads
,
5400 need_step_over_p
, NULL
);
5402 if (need_step_over
!= NULL
)
5405 debug_printf ("proceed_all_lwps: found "
5406 "thread %ld needing a step-over\n",
5407 lwpid_of (need_step_over
));
5409 start_step_over (get_thread_lwp (need_step_over
));
5415 debug_printf ("Proceeding, no step-over needed\n");
5417 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
5420 /* Stopped LWPs that the client wanted to be running, that don't have
5421 pending statuses, are set to run again, except for EXCEPT, if not
5422 NULL. This undoes a stop_all_lwps call. */
5425 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5431 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5432 lwpid_of (get_lwp_thread (except
)));
5434 debug_printf ("unstopping all lwps\n");
5438 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
5440 find_inferior (&all_threads
, proceed_one_lwp
, except
);
5444 debug_printf ("unstop_all_lwps done\n");
5450 #ifdef HAVE_LINUX_REGSETS
5452 #define use_linux_regsets 1
5454 /* Returns true if REGSET has been disabled. */
5457 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5459 return (info
->disabled_regsets
!= NULL
5460 && info
->disabled_regsets
[regset
- info
->regsets
]);
5463 /* Disable REGSET. */
5466 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5470 dr_offset
= regset
- info
->regsets
;
5471 if (info
->disabled_regsets
== NULL
)
5472 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5473 info
->disabled_regsets
[dr_offset
] = 1;
5477 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5478 struct regcache
*regcache
)
5480 struct regset_info
*regset
;
5481 int saw_general_regs
= 0;
5485 pid
= lwpid_of (current_thread
);
5486 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5491 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5494 buf
= xmalloc (regset
->size
);
5496 nt_type
= regset
->nt_type
;
5500 iov
.iov_len
= regset
->size
;
5501 data
= (void *) &iov
;
5507 res
= ptrace (regset
->get_request
, pid
,
5508 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5510 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5516 /* If we get EIO on a regset, do not try it again for
5517 this process mode. */
5518 disable_regset (regsets_info
, regset
);
5520 else if (errno
== ENODATA
)
5522 /* ENODATA may be returned if the regset is currently
5523 not "active". This can happen in normal operation,
5524 so suppress the warning in this case. */
5526 else if (errno
== ESRCH
)
5528 /* At this point, ESRCH should mean the process is
5529 already gone, in which case we simply ignore attempts
5530 to read its registers. */
5535 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5542 if (regset
->type
== GENERAL_REGS
)
5543 saw_general_regs
= 1;
5544 regset
->store_function (regcache
, buf
);
5548 if (saw_general_regs
)
5555 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5556 struct regcache
*regcache
)
5558 struct regset_info
*regset
;
5559 int saw_general_regs
= 0;
5563 pid
= lwpid_of (current_thread
);
5564 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5569 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5570 || regset
->fill_function
== NULL
)
5573 buf
= xmalloc (regset
->size
);
5575 /* First fill the buffer with the current register set contents,
5576 in case there are any items in the kernel's regset that are
5577 not in gdbserver's regcache. */
5579 nt_type
= regset
->nt_type
;
5583 iov
.iov_len
= regset
->size
;
5584 data
= (void *) &iov
;
5590 res
= ptrace (regset
->get_request
, pid
,
5591 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5593 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5598 /* Then overlay our cached registers on that. */
5599 regset
->fill_function (regcache
, buf
);
5601 /* Only now do we write the register set. */
5603 res
= ptrace (regset
->set_request
, pid
,
5604 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5606 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5614 /* If we get EIO on a regset, do not try it again for
5615 this process mode. */
5616 disable_regset (regsets_info
, regset
);
5618 else if (errno
== ESRCH
)
5620 /* At this point, ESRCH should mean the process is
5621 already gone, in which case we simply ignore attempts
5622 to change its registers. See also the related
5623 comment in linux_resume_one_lwp. */
5629 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5632 else if (regset
->type
== GENERAL_REGS
)
5633 saw_general_regs
= 1;
5636 if (saw_general_regs
)
5642 #else /* !HAVE_LINUX_REGSETS */
5644 #define use_linux_regsets 0
5645 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5646 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5650 /* Return 1 if register REGNO is supported by one of the regset ptrace
5651 calls or 0 if it has to be transferred individually. */
5654 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5656 unsigned char mask
= 1 << (regno
% 8);
5657 size_t index
= regno
/ 8;
5659 return (use_linux_regsets
5660 && (regs_info
->regset_bitmap
== NULL
5661 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5664 #ifdef HAVE_LINUX_USRREGS
5667 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5671 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5672 error ("Invalid register number %d.", regnum
);
5674 addr
= usrregs
->regmap
[regnum
];
5679 /* Fetch one register. */
5681 fetch_register (const struct usrregs_info
*usrregs
,
5682 struct regcache
*regcache
, int regno
)
5689 if (regno
>= usrregs
->num_regs
)
5691 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5694 regaddr
= register_addr (usrregs
, regno
);
5698 size
= ((register_size (regcache
->tdesc
, regno
)
5699 + sizeof (PTRACE_XFER_TYPE
) - 1)
5700 & -sizeof (PTRACE_XFER_TYPE
));
5701 buf
= (char *) alloca (size
);
5703 pid
= lwpid_of (current_thread
);
5704 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5707 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5708 ptrace (PTRACE_PEEKUSER
, pid
,
5709 /* Coerce to a uintptr_t first to avoid potential gcc warning
5710 of coercing an 8 byte integer to a 4 byte pointer. */
5711 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5712 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5714 error ("reading register %d: %s", regno
, strerror (errno
));
5717 if (the_low_target
.supply_ptrace_register
)
5718 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5720 supply_register (regcache
, regno
, buf
);
5723 /* Store one register. */
5725 store_register (const struct usrregs_info
*usrregs
,
5726 struct regcache
*regcache
, int regno
)
5733 if (regno
>= usrregs
->num_regs
)
5735 if ((*the_low_target
.cannot_store_register
) (regno
))
5738 regaddr
= register_addr (usrregs
, regno
);
5742 size
= ((register_size (regcache
->tdesc
, regno
)
5743 + sizeof (PTRACE_XFER_TYPE
) - 1)
5744 & -sizeof (PTRACE_XFER_TYPE
));
5745 buf
= (char *) alloca (size
);
5746 memset (buf
, 0, size
);
5748 if (the_low_target
.collect_ptrace_register
)
5749 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5751 collect_register (regcache
, regno
, buf
);
5753 pid
= lwpid_of (current_thread
);
5754 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5757 ptrace (PTRACE_POKEUSER
, pid
,
5758 /* Coerce to a uintptr_t first to avoid potential gcc warning
5759 about coercing an 8 byte integer to a 4 byte pointer. */
5760 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5761 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5764 /* At this point, ESRCH should mean the process is
5765 already gone, in which case we simply ignore attempts
5766 to change its registers. See also the related
5767 comment in linux_resume_one_lwp. */
5771 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5772 error ("writing register %d: %s", regno
, strerror (errno
));
5774 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5778 /* Fetch all registers, or just one, from the child process.
5779 If REGNO is -1, do this for all registers, skipping any that are
5780 assumed to have been retrieved by regsets_fetch_inferior_registers,
5781 unless ALL is non-zero.
5782 Otherwise, REGNO specifies which register (so we can save time). */
5784 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5785 struct regcache
*regcache
, int regno
, int all
)
5787 struct usrregs_info
*usr
= regs_info
->usrregs
;
5791 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5792 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5793 fetch_register (usr
, regcache
, regno
);
5796 fetch_register (usr
, regcache
, regno
);
5799 /* Store our register values back into the inferior.
5800 If REGNO is -1, do this for all registers, skipping any that are
5801 assumed to have been saved by regsets_store_inferior_registers,
5802 unless ALL is non-zero.
5803 Otherwise, REGNO specifies which register (so we can save time). */
5805 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5806 struct regcache
*regcache
, int regno
, int all
)
5808 struct usrregs_info
*usr
= regs_info
->usrregs
;
5812 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5813 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5814 store_register (usr
, regcache
, regno
);
5817 store_register (usr
, regcache
, regno
);
5820 #else /* !HAVE_LINUX_USRREGS */
5822 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5823 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5829 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5833 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5837 if (the_low_target
.fetch_register
!= NULL
5838 && regs_info
->usrregs
!= NULL
)
5839 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5840 (*the_low_target
.fetch_register
) (regcache
, regno
);
5842 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5843 if (regs_info
->usrregs
!= NULL
)
5844 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5848 if (the_low_target
.fetch_register
!= NULL
5849 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5852 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5854 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5856 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5857 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5862 linux_store_registers (struct regcache
*regcache
, int regno
)
5866 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5870 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5872 if (regs_info
->usrregs
!= NULL
)
5873 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5877 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5879 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5881 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5882 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5887 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5888 to debugger memory starting at MYADDR. */
5891 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5893 int pid
= lwpid_of (current_thread
);
5894 PTRACE_XFER_TYPE
*buffer
;
5902 /* Try using /proc. Don't bother for one word. */
5903 if (len
>= 3 * sizeof (long))
5907 /* We could keep this file open and cache it - possibly one per
5908 thread. That requires some juggling, but is even faster. */
5909 sprintf (filename
, "/proc/%d/mem", pid
);
5910 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5914 /* If pread64 is available, use it. It's faster if the kernel
5915 supports it (only one syscall), and it's 64-bit safe even on
5916 32-bit platforms (for instance, SPARC debugging a SPARC64
5919 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5922 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5923 bytes
= read (fd
, myaddr
, len
);
5930 /* Some data was read, we'll try to get the rest with ptrace. */
5940 /* Round starting address down to longword boundary. */
5941 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5942 /* Round ending address up; get number of longwords that makes. */
5943 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5944 / sizeof (PTRACE_XFER_TYPE
));
5945 /* Allocate buffer of that many longwords. */
5946 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5948 /* Read all the longwords */
5950 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5952 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5953 about coercing an 8 byte integer to a 4 byte pointer. */
5954 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5955 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5956 (PTRACE_TYPE_ARG4
) 0);
5962 /* Copy appropriate bytes out of the buffer. */
5965 i
*= sizeof (PTRACE_XFER_TYPE
);
5966 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5968 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5975 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5976 memory at MEMADDR. On failure (cannot write to the inferior)
5977 returns the value of errno. Always succeeds if LEN is zero. */
5980 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5983 /* Round starting address down to longword boundary. */
5984 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5985 /* Round ending address up; get number of longwords that makes. */
5987 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5988 / sizeof (PTRACE_XFER_TYPE
);
5990 /* Allocate buffer of that many longwords. */
5991 PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5993 int pid
= lwpid_of (current_thread
);
5997 /* Zero length write always succeeds. */
6003 /* Dump up to four bytes. */
6004 char str
[4 * 2 + 1];
6006 int dump
= len
< 4 ? len
: 4;
6008 for (i
= 0; i
< dump
; i
++)
6010 sprintf (p
, "%02x", myaddr
[i
]);
6015 debug_printf ("Writing %s to 0x%08lx in process %d\n",
6016 str
, (long) memaddr
, pid
);
6019 /* Fill start and end extra bytes of buffer with existing memory data. */
6022 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
6023 about coercing an 8 byte integer to a 4 byte pointer. */
6024 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
6025 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
6026 (PTRACE_TYPE_ARG4
) 0);
6034 = ptrace (PTRACE_PEEKTEXT
, pid
,
6035 /* Coerce to a uintptr_t first to avoid potential gcc warning
6036 about coercing an 8 byte integer to a 4 byte pointer. */
6037 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
6038 * sizeof (PTRACE_XFER_TYPE
)),
6039 (PTRACE_TYPE_ARG4
) 0);
6044 /* Copy data to be written over corresponding part of buffer. */
6046 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
6049 /* Write the entire buffer. */
6051 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
6054 ptrace (PTRACE_POKETEXT
, pid
,
6055 /* Coerce to a uintptr_t first to avoid potential gcc warning
6056 about coercing an 8 byte integer to a 4 byte pointer. */
6057 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
6058 (PTRACE_TYPE_ARG4
) buffer
[i
]);
6067 linux_look_up_symbols (void)
6069 #ifdef USE_THREAD_DB
6070 struct process_info
*proc
= current_process ();
6072 if (proc
->priv
->thread_db
!= NULL
)
6080 linux_request_interrupt (void)
6082 /* Send a SIGINT to the process group. This acts just like the user
6083 typed a ^C on the controlling terminal. */
6084 kill (-signal_pid
, SIGINT
);
6087 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
6088 to debugger memory starting at MYADDR. */
6091 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
6093 char filename
[PATH_MAX
];
6095 int pid
= lwpid_of (current_thread
);
6097 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6099 fd
= open (filename
, O_RDONLY
);
6103 if (offset
!= (CORE_ADDR
) 0
6104 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6107 n
= read (fd
, myaddr
, len
);
6114 /* These breakpoint and watchpoint related wrapper functions simply
6115 pass on the function call if the target has registered a
6116 corresponding function. */
6119 linux_supports_z_point_type (char z_type
)
6121 return (the_low_target
.supports_z_point_type
!= NULL
6122 && the_low_target
.supports_z_point_type (z_type
));
6126 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6127 int size
, struct raw_breakpoint
*bp
)
6129 if (type
== raw_bkpt_type_sw
)
6130 return insert_memory_breakpoint (bp
);
6131 else if (the_low_target
.insert_point
!= NULL
)
6132 return the_low_target
.insert_point (type
, addr
, size
, bp
);
6134 /* Unsupported (see target.h). */
6139 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6140 int size
, struct raw_breakpoint
*bp
)
6142 if (type
== raw_bkpt_type_sw
)
6143 return remove_memory_breakpoint (bp
);
6144 else if (the_low_target
.remove_point
!= NULL
)
6145 return the_low_target
.remove_point (type
, addr
, size
, bp
);
6147 /* Unsupported (see target.h). */
6151 /* Implement the to_stopped_by_sw_breakpoint target_ops
6155 linux_stopped_by_sw_breakpoint (void)
6157 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6159 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
6162 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
6166 linux_supports_stopped_by_sw_breakpoint (void)
6168 return USE_SIGTRAP_SIGINFO
;
6171 /* Implement the to_stopped_by_hw_breakpoint target_ops
6175 linux_stopped_by_hw_breakpoint (void)
6177 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6179 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6182 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6186 linux_supports_stopped_by_hw_breakpoint (void)
6188 return USE_SIGTRAP_SIGINFO
;
6191 /* Implement the supports_hardware_single_step target_ops method. */
6194 linux_supports_hardware_single_step (void)
6196 return can_hardware_single_step ();
6200 linux_supports_software_single_step (void)
6202 return can_software_single_step ();
6206 linux_stopped_by_watchpoint (void)
6208 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6210 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6214 linux_stopped_data_address (void)
6216 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6218 return lwp
->stopped_data_address
;
6221 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6222 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6223 && defined(PT_TEXT_END_ADDR)
6225 /* This is only used for targets that define PT_TEXT_ADDR,
6226 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6227 the target has different ways of acquiring this information, like
6230 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6231 to tell gdb about. */
6234 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6236 unsigned long text
, text_end
, data
;
6237 int pid
= lwpid_of (current_thread
);
6241 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6242 (PTRACE_TYPE_ARG4
) 0);
6243 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6244 (PTRACE_TYPE_ARG4
) 0);
6245 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6246 (PTRACE_TYPE_ARG4
) 0);
6250 /* Both text and data offsets produced at compile-time (and so
6251 used by gdb) are relative to the beginning of the program,
6252 with the data segment immediately following the text segment.
6253 However, the actual runtime layout in memory may put the data
6254 somewhere else, so when we send gdb a data base-address, we
6255 use the real data base address and subtract the compile-time
6256 data base-address from it (which is just the length of the
6257 text segment). BSS immediately follows data in both
6260 *data_p
= data
- (text_end
- text
);
6269 linux_qxfer_osdata (const char *annex
,
6270 unsigned char *readbuf
, unsigned const char *writebuf
,
6271 CORE_ADDR offset
, int len
)
6273 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6276 /* Convert a native/host siginfo object, into/from the siginfo in the
6277 layout of the inferiors' architecture. */
6280 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6284 if (the_low_target
.siginfo_fixup
!= NULL
)
6285 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6287 /* If there was no callback, or the callback didn't do anything,
6288 then just do a straight memcpy. */
6292 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6294 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6299 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6300 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6304 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6306 if (current_thread
== NULL
)
6309 pid
= lwpid_of (current_thread
);
6312 debug_printf ("%s siginfo for lwp %d.\n",
6313 readbuf
!= NULL
? "Reading" : "Writing",
6316 if (offset
>= sizeof (siginfo
))
6319 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6322 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6323 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6324 inferior with a 64-bit GDBSERVER should look the same as debugging it
6325 with a 32-bit GDBSERVER, we need to convert it. */
6326 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6328 if (offset
+ len
> sizeof (siginfo
))
6329 len
= sizeof (siginfo
) - offset
;
6331 if (readbuf
!= NULL
)
6332 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6335 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6337 /* Convert back to ptrace layout before flushing it out. */
6338 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6340 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6347 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6348 so we notice when children change state; as the handler for the
6349 sigsuspend in my_waitpid. */
6352 sigchld_handler (int signo
)
6354 int old_errno
= errno
;
6360 /* fprintf is not async-signal-safe, so call write
6362 if (write (2, "sigchld_handler\n",
6363 sizeof ("sigchld_handler\n") - 1) < 0)
6364 break; /* just ignore */
6368 if (target_is_async_p ())
6369 async_file_mark (); /* trigger a linux_wait */
6375 linux_supports_non_stop (void)
6381 linux_async (int enable
)
6383 int previous
= target_is_async_p ();
6386 debug_printf ("linux_async (%d), previous=%d\n",
6389 if (previous
!= enable
)
6392 sigemptyset (&mask
);
6393 sigaddset (&mask
, SIGCHLD
);
6395 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6399 if (pipe (linux_event_pipe
) == -1)
6401 linux_event_pipe
[0] = -1;
6402 linux_event_pipe
[1] = -1;
6403 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6405 warning ("creating event pipe failed.");
6409 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6410 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6412 /* Register the event loop handler. */
6413 add_file_handler (linux_event_pipe
[0],
6414 handle_target_event
, NULL
);
6416 /* Always trigger a linux_wait. */
6421 delete_file_handler (linux_event_pipe
[0]);
6423 close (linux_event_pipe
[0]);
6424 close (linux_event_pipe
[1]);
6425 linux_event_pipe
[0] = -1;
6426 linux_event_pipe
[1] = -1;
6429 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6436 linux_start_non_stop (int nonstop
)
6438 /* Register or unregister from event-loop accordingly. */
6439 linux_async (nonstop
);
6441 if (target_is_async_p () != (nonstop
!= 0))
6448 linux_supports_multi_process (void)
6453 /* Check if fork events are supported. */
6456 linux_supports_fork_events (void)
6458 return linux_supports_tracefork ();
6461 /* Check if vfork events are supported. */
6464 linux_supports_vfork_events (void)
6466 return linux_supports_tracefork ();
6469 /* Check if exec events are supported. */
6472 linux_supports_exec_events (void)
6474 return linux_supports_traceexec ();
6477 /* Callback for 'find_inferior'. Set the (possibly changed) ptrace
6478 options for the specified lwp. */
6481 reset_lwp_ptrace_options_callback (struct inferior_list_entry
*entry
,
6484 struct thread_info
*thread
= (struct thread_info
*) entry
;
6485 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6489 /* Stop the lwp so we can modify its ptrace options. */
6490 lwp
->must_set_ptrace_flags
= 1;
6491 linux_stop_lwp (lwp
);
6495 /* Already stopped; go ahead and set the ptrace options. */
6496 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6497 int options
= linux_low_ptrace_options (proc
->attached
);
6499 linux_enable_event_reporting (lwpid_of (thread
), options
);
6500 lwp
->must_set_ptrace_flags
= 0;
6506 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6507 ptrace flags for all inferiors. This is in case the new GDB connection
6508 doesn't support the same set of events that the previous one did. */
6511 linux_handle_new_gdb_connection (void)
6515 /* Request that all the lwps reset their ptrace options. */
6516 find_inferior (&all_threads
, reset_lwp_ptrace_options_callback
, &pid
);
6520 linux_supports_disable_randomization (void)
6522 #ifdef HAVE_PERSONALITY
6530 linux_supports_agent (void)
6536 linux_supports_range_stepping (void)
6538 if (can_software_single_step ())
6540 if (*the_low_target
.supports_range_stepping
== NULL
)
6543 return (*the_low_target
.supports_range_stepping
) ();
6546 /* Enumerate spufs IDs for process PID. */
6548 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6554 struct dirent
*entry
;
6556 sprintf (path
, "/proc/%ld/fd", pid
);
6557 dir
= opendir (path
);
6562 while ((entry
= readdir (dir
)) != NULL
)
6568 fd
= atoi (entry
->d_name
);
6572 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6573 if (stat (path
, &st
) != 0)
6575 if (!S_ISDIR (st
.st_mode
))
6578 if (statfs (path
, &stfs
) != 0)
6580 if (stfs
.f_type
!= SPUFS_MAGIC
)
6583 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6585 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6595 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6596 object type, using the /proc file system. */
6598 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6599 unsigned const char *writebuf
,
6600 CORE_ADDR offset
, int len
)
6602 long pid
= lwpid_of (current_thread
);
6607 if (!writebuf
&& !readbuf
)
6615 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6618 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6619 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6624 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6631 ret
= write (fd
, writebuf
, (size_t) len
);
6633 ret
= read (fd
, readbuf
, (size_t) len
);
6639 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6640 struct target_loadseg
6642 /* Core address to which the segment is mapped. */
6644 /* VMA recorded in the program header. */
6646 /* Size of this segment in memory. */
6650 # if defined PT_GETDSBT
6651 struct target_loadmap
6653 /* Protocol version number, must be zero. */
6655 /* Pointer to the DSBT table, its size, and the DSBT index. */
6656 unsigned *dsbt_table
;
6657 unsigned dsbt_size
, dsbt_index
;
6658 /* Number of segments in this map. */
6660 /* The actual memory map. */
6661 struct target_loadseg segs
[/*nsegs*/];
6663 # define LINUX_LOADMAP PT_GETDSBT
6664 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6665 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6667 struct target_loadmap
6669 /* Protocol version number, must be zero. */
6671 /* Number of segments in this map. */
6673 /* The actual memory map. */
6674 struct target_loadseg segs
[/*nsegs*/];
6676 # define LINUX_LOADMAP PTRACE_GETFDPIC
6677 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6678 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6682 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6683 unsigned char *myaddr
, unsigned int len
)
6685 int pid
= lwpid_of (current_thread
);
6687 struct target_loadmap
*data
= NULL
;
6688 unsigned int actual_length
, copy_length
;
6690 if (strcmp (annex
, "exec") == 0)
6691 addr
= (int) LINUX_LOADMAP_EXEC
;
6692 else if (strcmp (annex
, "interp") == 0)
6693 addr
= (int) LINUX_LOADMAP_INTERP
;
6697 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6703 actual_length
= sizeof (struct target_loadmap
)
6704 + sizeof (struct target_loadseg
) * data
->nsegs
;
6706 if (offset
< 0 || offset
> actual_length
)
6709 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6710 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6714 # define linux_read_loadmap NULL
6715 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6718 linux_process_qsupported (char **features
, int count
)
6720 if (the_low_target
.process_qsupported
!= NULL
)
6721 the_low_target
.process_qsupported (features
, count
);
6725 linux_supports_catch_syscall (void)
6727 return (the_low_target
.get_syscall_trapinfo
!= NULL
6728 && linux_supports_tracesysgood ());
6732 linux_get_ipa_tdesc_idx (void)
6734 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6737 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6741 linux_supports_tracepoints (void)
6743 if (*the_low_target
.supports_tracepoints
== NULL
)
6746 return (*the_low_target
.supports_tracepoints
) ();
6750 linux_read_pc (struct regcache
*regcache
)
6752 if (the_low_target
.get_pc
== NULL
)
6755 return (*the_low_target
.get_pc
) (regcache
);
6759 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6761 gdb_assert (the_low_target
.set_pc
!= NULL
);
6763 (*the_low_target
.set_pc
) (regcache
, pc
);
6767 linux_thread_stopped (struct thread_info
*thread
)
6769 return get_thread_lwp (thread
)->stopped
;
6772 /* This exposes stop-all-threads functionality to other modules. */
6775 linux_pause_all (int freeze
)
6777 stop_all_lwps (freeze
, NULL
);
6780 /* This exposes unstop-all-threads functionality to other gdbserver
6784 linux_unpause_all (int unfreeze
)
6786 unstop_all_lwps (unfreeze
, NULL
);
6790 linux_prepare_to_access_memory (void)
6792 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6795 linux_pause_all (1);
6800 linux_done_accessing_memory (void)
6802 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6805 linux_unpause_all (1);
6809 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6810 CORE_ADDR collector
,
6813 CORE_ADDR
*jump_entry
,
6814 CORE_ADDR
*trampoline
,
6815 ULONGEST
*trampoline_size
,
6816 unsigned char *jjump_pad_insn
,
6817 ULONGEST
*jjump_pad_insn_size
,
6818 CORE_ADDR
*adjusted_insn_addr
,
6819 CORE_ADDR
*adjusted_insn_addr_end
,
6822 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6823 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6824 jump_entry
, trampoline
, trampoline_size
,
6825 jjump_pad_insn
, jjump_pad_insn_size
,
6826 adjusted_insn_addr
, adjusted_insn_addr_end
,
6830 static struct emit_ops
*
6831 linux_emit_ops (void)
6833 if (the_low_target
.emit_ops
!= NULL
)
6834 return (*the_low_target
.emit_ops
) ();
6840 linux_get_min_fast_tracepoint_insn_len (void)
6842 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6845 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6848 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6849 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6851 char filename
[PATH_MAX
];
6853 const int auxv_size
= is_elf64
6854 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6855 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6857 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6859 fd
= open (filename
, O_RDONLY
);
6865 while (read (fd
, buf
, auxv_size
) == auxv_size
6866 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6870 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6872 switch (aux
->a_type
)
6875 *phdr_memaddr
= aux
->a_un
.a_val
;
6878 *num_phdr
= aux
->a_un
.a_val
;
6884 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6886 switch (aux
->a_type
)
6889 *phdr_memaddr
= aux
->a_un
.a_val
;
6892 *num_phdr
= aux
->a_un
.a_val
;
6900 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6902 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6903 "phdr_memaddr = %ld, phdr_num = %d",
6904 (long) *phdr_memaddr
, *num_phdr
);
6911 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6914 get_dynamic (const int pid
, const int is_elf64
)
6916 CORE_ADDR phdr_memaddr
, relocation
;
6918 unsigned char *phdr_buf
;
6919 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6921 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6924 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6925 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6927 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6930 /* Compute relocation: it is expected to be 0 for "regular" executables,
6931 non-zero for PIE ones. */
6933 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6936 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6938 if (p
->p_type
== PT_PHDR
)
6939 relocation
= phdr_memaddr
- p
->p_vaddr
;
6943 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6945 if (p
->p_type
== PT_PHDR
)
6946 relocation
= phdr_memaddr
- p
->p_vaddr
;
6949 if (relocation
== -1)
6951 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6952 any real world executables, including PIE executables, have always
6953 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6954 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6955 or present DT_DEBUG anyway (fpc binaries are statically linked).
6957 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6959 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6964 for (i
= 0; i
< num_phdr
; i
++)
6968 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6970 if (p
->p_type
== PT_DYNAMIC
)
6971 return p
->p_vaddr
+ relocation
;
6975 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6977 if (p
->p_type
== PT_DYNAMIC
)
6978 return p
->p_vaddr
+ relocation
;
6985 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6986 can be 0 if the inferior does not yet have the library list initialized.
6987 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6988 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6991 get_r_debug (const int pid
, const int is_elf64
)
6993 CORE_ADDR dynamic_memaddr
;
6994 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6995 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6998 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6999 if (dynamic_memaddr
== 0)
7002 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
7006 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
7007 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
7011 unsigned char buf
[sizeof (Elf64_Xword
)];
7015 #ifdef DT_MIPS_RLD_MAP
7016 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
7018 if (linux_read_memory (dyn
->d_un
.d_val
,
7019 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7024 #endif /* DT_MIPS_RLD_MAP */
7025 #ifdef DT_MIPS_RLD_MAP_REL
7026 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
7028 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
7029 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7034 #endif /* DT_MIPS_RLD_MAP_REL */
7036 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
7037 map
= dyn
->d_un
.d_val
;
7039 if (dyn
->d_tag
== DT_NULL
)
7044 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
7045 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
7049 unsigned char buf
[sizeof (Elf32_Word
)];
7053 #ifdef DT_MIPS_RLD_MAP
7054 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
7056 if (linux_read_memory (dyn
->d_un
.d_val
,
7057 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7062 #endif /* DT_MIPS_RLD_MAP */
7063 #ifdef DT_MIPS_RLD_MAP_REL
7064 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
7066 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
7067 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7072 #endif /* DT_MIPS_RLD_MAP_REL */
7074 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
7075 map
= dyn
->d_un
.d_val
;
7077 if (dyn
->d_tag
== DT_NULL
)
7081 dynamic_memaddr
+= dyn_size
;
7087 /* Read one pointer from MEMADDR in the inferior. */
7090 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
7094 /* Go through a union so this works on either big or little endian
7095 hosts, when the inferior's pointer size is smaller than the size
7096 of CORE_ADDR. It is assumed the inferior's endianness is the
7097 same of the superior's. */
7100 CORE_ADDR core_addr
;
7105 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
7108 if (ptr_size
== sizeof (CORE_ADDR
))
7109 *ptr
= addr
.core_addr
;
7110 else if (ptr_size
== sizeof (unsigned int))
7113 gdb_assert_not_reached ("unhandled pointer size");
7118 struct link_map_offsets
7120 /* Offset and size of r_debug.r_version. */
7121 int r_version_offset
;
7123 /* Offset and size of r_debug.r_map. */
7126 /* Offset to l_addr field in struct link_map. */
7129 /* Offset to l_name field in struct link_map. */
7132 /* Offset to l_ld field in struct link_map. */
7135 /* Offset to l_next field in struct link_map. */
7138 /* Offset to l_prev field in struct link_map. */
7142 /* Construct qXfer:libraries-svr4:read reply. */
7145 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
7146 unsigned const char *writebuf
,
7147 CORE_ADDR offset
, int len
)
7150 unsigned document_len
;
7151 struct process_info_private
*const priv
= current_process ()->priv
;
7152 char filename
[PATH_MAX
];
7155 static const struct link_map_offsets lmo_32bit_offsets
=
7157 0, /* r_version offset. */
7158 4, /* r_debug.r_map offset. */
7159 0, /* l_addr offset in link_map. */
7160 4, /* l_name offset in link_map. */
7161 8, /* l_ld offset in link_map. */
7162 12, /* l_next offset in link_map. */
7163 16 /* l_prev offset in link_map. */
7166 static const struct link_map_offsets lmo_64bit_offsets
=
7168 0, /* r_version offset. */
7169 8, /* r_debug.r_map offset. */
7170 0, /* l_addr offset in link_map. */
7171 8, /* l_name offset in link_map. */
7172 16, /* l_ld offset in link_map. */
7173 24, /* l_next offset in link_map. */
7174 32 /* l_prev offset in link_map. */
7176 const struct link_map_offsets
*lmo
;
7177 unsigned int machine
;
7179 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7180 int allocated
= 1024;
7182 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7183 int header_done
= 0;
7185 if (writebuf
!= NULL
)
7187 if (readbuf
== NULL
)
7190 pid
= lwpid_of (current_thread
);
7191 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7192 is_elf64
= elf_64_file_p (filename
, &machine
);
7193 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7194 ptr_size
= is_elf64
? 8 : 4;
7196 while (annex
[0] != '\0')
7202 sep
= strchr (annex
, '=');
7207 if (len
== 5 && startswith (annex
, "start"))
7209 else if (len
== 4 && startswith (annex
, "prev"))
7213 annex
= strchr (sep
, ';');
7220 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7227 if (priv
->r_debug
== 0)
7228 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7230 /* We failed to find DT_DEBUG. Such situation will not change
7231 for this inferior - do not retry it. Report it to GDB as
7232 E01, see for the reasons at the GDB solib-svr4.c side. */
7233 if (priv
->r_debug
== (CORE_ADDR
) -1)
7236 if (priv
->r_debug
!= 0)
7238 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7239 (unsigned char *) &r_version
,
7240 sizeof (r_version
)) != 0
7243 warning ("unexpected r_debug version %d", r_version
);
7245 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7246 &lm_addr
, ptr_size
) != 0)
7248 warning ("unable to read r_map from 0x%lx",
7249 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7254 document
= (char *) xmalloc (allocated
);
7255 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7256 p
= document
+ strlen (document
);
7259 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7260 &l_name
, ptr_size
) == 0
7261 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7262 &l_addr
, ptr_size
) == 0
7263 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7264 &l_ld
, ptr_size
) == 0
7265 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7266 &l_prev
, ptr_size
) == 0
7267 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7268 &l_next
, ptr_size
) == 0)
7270 unsigned char libname
[PATH_MAX
];
7272 if (lm_prev
!= l_prev
)
7274 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7275 (long) lm_prev
, (long) l_prev
);
7279 /* Ignore the first entry even if it has valid name as the first entry
7280 corresponds to the main executable. The first entry should not be
7281 skipped if the dynamic loader was loaded late by a static executable
7282 (see solib-svr4.c parameter ignore_first). But in such case the main
7283 executable does not have PT_DYNAMIC present and this function already
7284 exited above due to failed get_r_debug. */
7287 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7292 /* Not checking for error because reading may stop before
7293 we've got PATH_MAX worth of characters. */
7295 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7296 libname
[sizeof (libname
) - 1] = '\0';
7297 if (libname
[0] != '\0')
7299 /* 6x the size for xml_escape_text below. */
7300 size_t len
= 6 * strlen ((char *) libname
);
7304 /* Terminate `<library-list-svr4'. */
7309 while (allocated
< p
- document
+ len
+ 200)
7311 /* Expand to guarantee sufficient storage. */
7312 uintptr_t document_len
= p
- document
;
7314 document
= (char *) xrealloc (document
, 2 * allocated
);
7316 p
= document
+ document_len
;
7319 std::string name
= xml_escape_text ((char *) libname
);
7320 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7321 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7322 name
.c_str (), (unsigned long) lm_addr
,
7323 (unsigned long) l_addr
, (unsigned long) l_ld
);
7333 /* Empty list; terminate `<library-list-svr4'. */
7337 strcpy (p
, "</library-list-svr4>");
7339 document_len
= strlen (document
);
7340 if (offset
< document_len
)
7341 document_len
-= offset
;
7344 if (len
> document_len
)
7347 memcpy (readbuf
, document
+ offset
, len
);
7353 #ifdef HAVE_LINUX_BTRACE
7355 /* See to_disable_btrace target method. */
7358 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7360 enum btrace_error err
;
7362 err
= linux_disable_btrace (tinfo
);
7363 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7366 /* Encode an Intel Processor Trace configuration. */
7369 linux_low_encode_pt_config (struct buffer
*buffer
,
7370 const struct btrace_data_pt_config
*config
)
7372 buffer_grow_str (buffer
, "<pt-config>\n");
7374 switch (config
->cpu
.vendor
)
7377 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7378 "model=\"%u\" stepping=\"%u\"/>\n",
7379 config
->cpu
.family
, config
->cpu
.model
,
7380 config
->cpu
.stepping
);
7387 buffer_grow_str (buffer
, "</pt-config>\n");
7390 /* Encode a raw buffer. */
7393 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7399 /* We use hex encoding - see common/rsp-low.h. */
7400 buffer_grow_str (buffer
, "<raw>\n");
7406 elem
[0] = tohex ((*data
>> 4) & 0xf);
7407 elem
[1] = tohex (*data
++ & 0xf);
7409 buffer_grow (buffer
, elem
, 2);
7412 buffer_grow_str (buffer
, "</raw>\n");
7415 /* See to_read_btrace target method. */
7418 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7419 enum btrace_read_type type
)
7421 struct btrace_data btrace
;
7422 struct btrace_block
*block
;
7423 enum btrace_error err
;
7426 btrace_data_init (&btrace
);
7428 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7429 if (err
!= BTRACE_ERR_NONE
)
7431 if (err
== BTRACE_ERR_OVERFLOW
)
7432 buffer_grow_str0 (buffer
, "E.Overflow.");
7434 buffer_grow_str0 (buffer
, "E.Generic Error.");
7439 switch (btrace
.format
)
7441 case BTRACE_FORMAT_NONE
:
7442 buffer_grow_str0 (buffer
, "E.No Trace.");
7445 case BTRACE_FORMAT_BTS
:
7446 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7447 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7450 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7452 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7453 paddress (block
->begin
), paddress (block
->end
));
7455 buffer_grow_str0 (buffer
, "</btrace>\n");
7458 case BTRACE_FORMAT_PT
:
7459 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7460 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7461 buffer_grow_str (buffer
, "<pt>\n");
7463 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7465 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7466 btrace
.variant
.pt
.size
);
7468 buffer_grow_str (buffer
, "</pt>\n");
7469 buffer_grow_str0 (buffer
, "</btrace>\n");
7473 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7477 btrace_data_fini (&btrace
);
7481 btrace_data_fini (&btrace
);
7485 /* See to_btrace_conf target method. */
7488 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7489 struct buffer
*buffer
)
7491 const struct btrace_config
*conf
;
7493 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7494 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7496 conf
= linux_btrace_conf (tinfo
);
7499 switch (conf
->format
)
7501 case BTRACE_FORMAT_NONE
:
7504 case BTRACE_FORMAT_BTS
:
7505 buffer_xml_printf (buffer
, "<bts");
7506 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7507 buffer_xml_printf (buffer
, " />\n");
7510 case BTRACE_FORMAT_PT
:
7511 buffer_xml_printf (buffer
, "<pt");
7512 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7513 buffer_xml_printf (buffer
, "/>\n");
7518 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7521 #endif /* HAVE_LINUX_BTRACE */
7523 /* See nat/linux-nat.h. */
7526 current_lwp_ptid (void)
7528 return ptid_of (current_thread
);
7531 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7534 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7536 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7537 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7539 return default_breakpoint_kind_from_pc (pcptr
);
7542 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7544 static const gdb_byte
*
7545 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7547 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7549 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7552 /* Implementation of the target_ops method
7553 "breakpoint_kind_from_current_state". */
7556 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7558 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7559 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7561 return linux_breakpoint_kind_from_pc (pcptr
);
7564 /* Default implementation of linux_target_ops method "set_pc" for
7565 32-bit pc register which is literally named "pc". */
7568 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7570 uint32_t newpc
= pc
;
7572 supply_register_by_name (regcache
, "pc", &newpc
);
7575 /* Default implementation of linux_target_ops method "get_pc" for
7576 32-bit pc register which is literally named "pc". */
7579 linux_get_pc_32bit (struct regcache
*regcache
)
7583 collect_register_by_name (regcache
, "pc", &pc
);
7585 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7589 /* Default implementation of linux_target_ops method "set_pc" for
7590 64-bit pc register which is literally named "pc". */
7593 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7595 uint64_t newpc
= pc
;
7597 supply_register_by_name (regcache
, "pc", &newpc
);
7600 /* Default implementation of linux_target_ops method "get_pc" for
7601 64-bit pc register which is literally named "pc". */
7604 linux_get_pc_64bit (struct regcache
*regcache
)
7608 collect_register_by_name (regcache
, "pc", &pc
);
7610 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7615 static struct target_ops linux_target_ops
= {
7616 linux_create_inferior
,
7617 linux_post_create_inferior
,
7626 linux_fetch_registers
,
7627 linux_store_registers
,
7628 linux_prepare_to_access_memory
,
7629 linux_done_accessing_memory
,
7632 linux_look_up_symbols
,
7633 linux_request_interrupt
,
7635 linux_supports_z_point_type
,
7638 linux_stopped_by_sw_breakpoint
,
7639 linux_supports_stopped_by_sw_breakpoint
,
7640 linux_stopped_by_hw_breakpoint
,
7641 linux_supports_stopped_by_hw_breakpoint
,
7642 linux_supports_hardware_single_step
,
7643 linux_stopped_by_watchpoint
,
7644 linux_stopped_data_address
,
7645 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7646 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7647 && defined(PT_TEXT_END_ADDR)
7652 #ifdef USE_THREAD_DB
7653 thread_db_get_tls_address
,
7658 hostio_last_error_from_errno
,
7661 linux_supports_non_stop
,
7663 linux_start_non_stop
,
7664 linux_supports_multi_process
,
7665 linux_supports_fork_events
,
7666 linux_supports_vfork_events
,
7667 linux_supports_exec_events
,
7668 linux_handle_new_gdb_connection
,
7669 #ifdef USE_THREAD_DB
7670 thread_db_handle_monitor_command
,
7674 linux_common_core_of_thread
,
7676 linux_process_qsupported
,
7677 linux_supports_tracepoints
,
7680 linux_thread_stopped
,
7684 linux_stabilize_threads
,
7685 linux_install_fast_tracepoint_jump_pad
,
7687 linux_supports_disable_randomization
,
7688 linux_get_min_fast_tracepoint_insn_len
,
7689 linux_qxfer_libraries_svr4
,
7690 linux_supports_agent
,
7691 #ifdef HAVE_LINUX_BTRACE
7692 linux_supports_btrace
,
7693 linux_enable_btrace
,
7694 linux_low_disable_btrace
,
7695 linux_low_read_btrace
,
7696 linux_low_btrace_conf
,
7704 linux_supports_range_stepping
,
7705 linux_proc_pid_to_exec_file
,
7706 linux_mntns_open_cloexec
,
7708 linux_mntns_readlink
,
7709 linux_breakpoint_kind_from_pc
,
7710 linux_sw_breakpoint_from_kind
,
7711 linux_proc_tid_get_name
,
7712 linux_breakpoint_kind_from_current_state
,
7713 linux_supports_software_single_step
,
7714 linux_supports_catch_syscall
,
7715 linux_get_ipa_tdesc_idx
,
7717 thread_db_thread_handle
,
7723 #ifdef HAVE_LINUX_REGSETS
7725 initialize_regsets_info (struct regsets_info
*info
)
7727 for (info
->num_regsets
= 0;
7728 info
->regsets
[info
->num_regsets
].size
>= 0;
7729 info
->num_regsets
++)
7735 initialize_low (void)
7737 struct sigaction sigchld_action
;
7739 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7740 set_target_ops (&linux_target_ops
);
7742 linux_ptrace_init_warnings ();
7744 sigchld_action
.sa_handler
= sigchld_handler
;
7745 sigemptyset (&sigchld_action
.sa_mask
);
7746 sigchld_action
.sa_flags
= SA_RESTART
;
7747 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7749 initialize_low_arch ();
7751 linux_check_ptrace_features ();