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 free (priv
->arch_private
);
1692 process
->priv
= NULL
;
1694 remove_process (process
);
1698 linux_join (int pid
)
1703 ret
= my_waitpid (pid
, &status
, 0);
1704 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1706 } while (ret
!= -1 || errno
!= ECHILD
);
1709 /* Return nonzero if the given thread is still alive. */
1711 linux_thread_alive (ptid_t ptid
)
1713 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1715 /* We assume we always know if a thread exits. If a whole process
1716 exited but we still haven't been able to report it to GDB, we'll
1717 hold on to the last lwp of the dead process. */
1719 return !lwp_is_marked_dead (lwp
);
1724 /* Return 1 if this lwp still has an interesting status pending. If
1725 not (e.g., it had stopped for a breakpoint that is gone), return
1729 thread_still_has_status_pending_p (struct thread_info
*thread
)
1731 struct lwp_info
*lp
= get_thread_lwp (thread
);
1733 if (!lp
->status_pending_p
)
1736 if (thread
->last_resume_kind
!= resume_stop
1737 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1738 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1740 struct thread_info
*saved_thread
;
1744 gdb_assert (lp
->last_status
!= 0);
1748 saved_thread
= current_thread
;
1749 current_thread
= thread
;
1751 if (pc
!= lp
->stop_pc
)
1754 debug_printf ("PC of %ld changed\n",
1759 #if !USE_SIGTRAP_SIGINFO
1760 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1761 && !(*the_low_target
.breakpoint_at
) (pc
))
1764 debug_printf ("previous SW breakpoint of %ld gone\n",
1768 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1769 && !hardware_breakpoint_inserted_here (pc
))
1772 debug_printf ("previous HW breakpoint of %ld gone\n",
1778 current_thread
= saved_thread
;
1783 debug_printf ("discarding pending breakpoint status\n");
1784 lp
->status_pending_p
= 0;
1792 /* Returns true if LWP is resumed from the client's perspective. */
1795 lwp_resumed (struct lwp_info
*lwp
)
1797 struct thread_info
*thread
= get_lwp_thread (lwp
);
1799 if (thread
->last_resume_kind
!= resume_stop
)
1802 /* Did gdb send us a `vCont;t', but we haven't reported the
1803 corresponding stop to gdb yet? If so, the thread is still
1804 resumed/running from gdb's perspective. */
1805 if (thread
->last_resume_kind
== resume_stop
1806 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1812 /* Return 1 if this lwp has an interesting status pending. */
1814 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1816 struct thread_info
*thread
= (struct thread_info
*) entry
;
1817 struct lwp_info
*lp
= get_thread_lwp (thread
);
1818 ptid_t ptid
= * (ptid_t
*) arg
;
1820 /* Check if we're only interested in events from a specific process
1821 or a specific LWP. */
1822 if (!ptid_match (ptid_of (thread
), ptid
))
1825 if (!lwp_resumed (lp
))
1828 if (lp
->status_pending_p
1829 && !thread_still_has_status_pending_p (thread
))
1831 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1835 return lp
->status_pending_p
;
1839 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1841 ptid_t ptid
= *(ptid_t
*) data
;
1844 if (ptid_get_lwp (ptid
) != 0)
1845 lwp
= ptid_get_lwp (ptid
);
1847 lwp
= ptid_get_pid (ptid
);
1849 if (ptid_get_lwp (entry
->id
) == lwp
)
1856 find_lwp_pid (ptid_t ptid
)
1858 struct inferior_list_entry
*thread
1859 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1864 return get_thread_lwp ((struct thread_info
*) thread
);
1867 /* Return the number of known LWPs in the tgid given by PID. */
1872 struct inferior_list_entry
*inf
, *tmp
;
1875 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1877 if (ptid_get_pid (inf
->id
) == pid
)
1884 /* The arguments passed to iterate_over_lwps. */
1886 struct iterate_over_lwps_args
1888 /* The FILTER argument passed to iterate_over_lwps. */
1891 /* The CALLBACK argument passed to iterate_over_lwps. */
1892 iterate_over_lwps_ftype
*callback
;
1894 /* The DATA argument passed to iterate_over_lwps. */
1898 /* Callback for find_inferior used by iterate_over_lwps to filter
1899 calls to the callback supplied to that function. Returning a
1900 nonzero value causes find_inferiors to stop iterating and return
1901 the current inferior_list_entry. Returning zero indicates that
1902 find_inferiors should continue iterating. */
1905 iterate_over_lwps_filter (struct inferior_list_entry
*entry
, void *args_p
)
1907 struct iterate_over_lwps_args
*args
1908 = (struct iterate_over_lwps_args
*) args_p
;
1910 if (ptid_match (entry
->id
, args
->filter
))
1912 struct thread_info
*thr
= (struct thread_info
*) entry
;
1913 struct lwp_info
*lwp
= get_thread_lwp (thr
);
1915 return (*args
->callback
) (lwp
, args
->data
);
1921 /* See nat/linux-nat.h. */
1924 iterate_over_lwps (ptid_t filter
,
1925 iterate_over_lwps_ftype callback
,
1928 struct iterate_over_lwps_args args
= {filter
, callback
, data
};
1929 struct inferior_list_entry
*entry
;
1931 entry
= find_inferior (&all_threads
, iterate_over_lwps_filter
, &args
);
1935 return get_thread_lwp ((struct thread_info
*) entry
);
1938 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1939 their exits until all other threads in the group have exited. */
1942 check_zombie_leaders (void)
1944 struct process_info
*proc
, *tmp
;
1946 ALL_PROCESSES (proc
, tmp
)
1948 pid_t leader_pid
= pid_of (proc
);
1949 struct lwp_info
*leader_lp
;
1951 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1954 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1955 "num_lwps=%d, zombie=%d\n",
1956 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1957 linux_proc_pid_is_zombie (leader_pid
));
1959 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1960 /* Check if there are other threads in the group, as we may
1961 have raced with the inferior simply exiting. */
1962 && !last_thread_of_process_p (leader_pid
)
1963 && linux_proc_pid_is_zombie (leader_pid
))
1965 /* A leader zombie can mean one of two things:
1967 - It exited, and there's an exit status pending
1968 available, or only the leader exited (not the whole
1969 program). In the latter case, we can't waitpid the
1970 leader's exit status until all other threads are gone.
1972 - There are 3 or more threads in the group, and a thread
1973 other than the leader exec'd. On an exec, the Linux
1974 kernel destroys all other threads (except the execing
1975 one) in the thread group, and resets the execing thread's
1976 tid to the tgid. No exit notification is sent for the
1977 execing thread -- from the ptracer's perspective, it
1978 appears as though the execing thread just vanishes.
1979 Until we reap all other threads except the leader and the
1980 execing thread, the leader will be zombie, and the
1981 execing thread will be in `D (disc sleep)'. As soon as
1982 all other threads are reaped, the execing thread changes
1983 it's tid to the tgid, and the previous (zombie) leader
1984 vanishes, giving place to the "new" leader. We could try
1985 distinguishing the exit and exec cases, by waiting once
1986 more, and seeing if something comes out, but it doesn't
1987 sound useful. The previous leader _does_ go away, and
1988 we'll re-add the new one once we see the exec event
1989 (which is just the same as what would happen if the
1990 previous leader did exit voluntarily before some other
1994 debug_printf ("CZL: Thread group leader %d zombie "
1995 "(it exited, or another thread execd).\n",
1998 delete_lwp (leader_lp
);
2003 /* Callback for `find_inferior'. Returns the first LWP that is not
2004 stopped. ARG is a PTID filter. */
2007 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
2009 struct thread_info
*thr
= (struct thread_info
*) entry
;
2010 struct lwp_info
*lwp
;
2011 ptid_t filter
= *(ptid_t
*) arg
;
2013 if (!ptid_match (ptid_of (thr
), filter
))
2016 lwp
= get_thread_lwp (thr
);
2023 /* Increment LWP's suspend count. */
2026 lwp_suspended_inc (struct lwp_info
*lwp
)
2030 if (debug_threads
&& lwp
->suspended
> 4)
2032 struct thread_info
*thread
= get_lwp_thread (lwp
);
2034 debug_printf ("LWP %ld has a suspiciously high suspend count,"
2035 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
2039 /* Decrement LWP's suspend count. */
2042 lwp_suspended_decr (struct lwp_info
*lwp
)
2046 if (lwp
->suspended
< 0)
2048 struct thread_info
*thread
= get_lwp_thread (lwp
);
2050 internal_error (__FILE__
, __LINE__
,
2051 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
2056 /* This function should only be called if the LWP got a SIGTRAP.
2058 Handle any tracepoint steps or hits. Return true if a tracepoint
2059 event was handled, 0 otherwise. */
2062 handle_tracepoints (struct lwp_info
*lwp
)
2064 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
2065 int tpoint_related_event
= 0;
2067 gdb_assert (lwp
->suspended
== 0);
2069 /* If this tracepoint hit causes a tracing stop, we'll immediately
2070 uninsert tracepoints. To do this, we temporarily pause all
2071 threads, unpatch away, and then unpause threads. We need to make
2072 sure the unpausing doesn't resume LWP too. */
2073 lwp_suspended_inc (lwp
);
2075 /* And we need to be sure that any all-threads-stopping doesn't try
2076 to move threads out of the jump pads, as it could deadlock the
2077 inferior (LWP could be in the jump pad, maybe even holding the
2080 /* Do any necessary step collect actions. */
2081 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2083 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2085 /* See if we just hit a tracepoint and do its main collect
2087 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2089 lwp_suspended_decr (lwp
);
2091 gdb_assert (lwp
->suspended
== 0);
2092 gdb_assert (!stabilizing_threads
2093 || (lwp
->collecting_fast_tracepoint
2094 != fast_tpoint_collect_result::not_collecting
));
2096 if (tpoint_related_event
)
2099 debug_printf ("got a tracepoint event\n");
2106 /* Convenience wrapper. Returns information about LWP's fast tracepoint
2107 collection status. */
2109 static fast_tpoint_collect_result
2110 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2111 struct fast_tpoint_collect_status
*status
)
2113 CORE_ADDR thread_area
;
2114 struct thread_info
*thread
= get_lwp_thread (lwp
);
2116 if (the_low_target
.get_thread_area
== NULL
)
2117 return fast_tpoint_collect_result::not_collecting
;
2119 /* Get the thread area address. This is used to recognize which
2120 thread is which when tracing with the in-process agent library.
2121 We don't read anything from the address, and treat it as opaque;
2122 it's the address itself that we assume is unique per-thread. */
2123 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2124 return fast_tpoint_collect_result::not_collecting
;
2126 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2129 /* The reason we resume in the caller, is because we want to be able
2130 to pass lwp->status_pending as WSTAT, and we need to clear
2131 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2132 refuses to resume. */
2135 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2137 struct thread_info
*saved_thread
;
2139 saved_thread
= current_thread
;
2140 current_thread
= get_lwp_thread (lwp
);
2143 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2144 && supports_fast_tracepoints ()
2145 && agent_loaded_p ())
2147 struct fast_tpoint_collect_status status
;
2150 debug_printf ("Checking whether LWP %ld needs to move out of the "
2152 lwpid_of (current_thread
));
2154 fast_tpoint_collect_result r
2155 = linux_fast_tracepoint_collecting (lwp
, &status
);
2158 || (WSTOPSIG (*wstat
) != SIGILL
2159 && WSTOPSIG (*wstat
) != SIGFPE
2160 && WSTOPSIG (*wstat
) != SIGSEGV
2161 && WSTOPSIG (*wstat
) != SIGBUS
))
2163 lwp
->collecting_fast_tracepoint
= r
;
2165 if (r
!= fast_tpoint_collect_result::not_collecting
)
2167 if (r
== fast_tpoint_collect_result::before_insn
2168 && lwp
->exit_jump_pad_bkpt
== NULL
)
2170 /* Haven't executed the original instruction yet.
2171 Set breakpoint there, and wait till it's hit,
2172 then single-step until exiting the jump pad. */
2173 lwp
->exit_jump_pad_bkpt
2174 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2178 debug_printf ("Checking whether LWP %ld needs to move out of "
2179 "the jump pad...it does\n",
2180 lwpid_of (current_thread
));
2181 current_thread
= saved_thread
;
2188 /* If we get a synchronous signal while collecting, *and*
2189 while executing the (relocated) original instruction,
2190 reset the PC to point at the tpoint address, before
2191 reporting to GDB. Otherwise, it's an IPA lib bug: just
2192 report the signal to GDB, and pray for the best. */
2194 lwp
->collecting_fast_tracepoint
2195 = fast_tpoint_collect_result::not_collecting
;
2197 if (r
!= fast_tpoint_collect_result::not_collecting
2198 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2199 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2202 struct regcache
*regcache
;
2204 /* The si_addr on a few signals references the address
2205 of the faulting instruction. Adjust that as
2207 if ((WSTOPSIG (*wstat
) == SIGILL
2208 || WSTOPSIG (*wstat
) == SIGFPE
2209 || WSTOPSIG (*wstat
) == SIGBUS
2210 || WSTOPSIG (*wstat
) == SIGSEGV
)
2211 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2212 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2213 /* Final check just to make sure we don't clobber
2214 the siginfo of non-kernel-sent signals. */
2215 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2217 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2218 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2219 (PTRACE_TYPE_ARG3
) 0, &info
);
2222 regcache
= get_thread_regcache (current_thread
, 1);
2223 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2224 lwp
->stop_pc
= status
.tpoint_addr
;
2226 /* Cancel any fast tracepoint lock this thread was
2228 force_unlock_trace_buffer ();
2231 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2234 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2235 "stopping all threads momentarily.\n");
2237 stop_all_lwps (1, lwp
);
2239 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2240 lwp
->exit_jump_pad_bkpt
= NULL
;
2242 unstop_all_lwps (1, lwp
);
2244 gdb_assert (lwp
->suspended
>= 0);
2250 debug_printf ("Checking whether LWP %ld needs to move out of the "
2252 lwpid_of (current_thread
));
2254 current_thread
= saved_thread
;
2258 /* Enqueue one signal in the "signals to report later when out of the
2262 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2264 struct pending_signals
*p_sig
;
2265 struct thread_info
*thread
= get_lwp_thread (lwp
);
2268 debug_printf ("Deferring signal %d for LWP %ld.\n",
2269 WSTOPSIG (*wstat
), lwpid_of (thread
));
2273 struct pending_signals
*sig
;
2275 for (sig
= lwp
->pending_signals_to_report
;
2278 debug_printf (" Already queued %d\n",
2281 debug_printf (" (no more currently queued signals)\n");
2284 /* Don't enqueue non-RT signals if they are already in the deferred
2285 queue. (SIGSTOP being the easiest signal to see ending up here
2287 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2289 struct pending_signals
*sig
;
2291 for (sig
= lwp
->pending_signals_to_report
;
2295 if (sig
->signal
== WSTOPSIG (*wstat
))
2298 debug_printf ("Not requeuing already queued non-RT signal %d"
2307 p_sig
= XCNEW (struct pending_signals
);
2308 p_sig
->prev
= lwp
->pending_signals_to_report
;
2309 p_sig
->signal
= WSTOPSIG (*wstat
);
2311 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2314 lwp
->pending_signals_to_report
= p_sig
;
2317 /* Dequeue one signal from the "signals to report later when out of
2318 the jump pad" list. */
2321 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2323 struct thread_info
*thread
= get_lwp_thread (lwp
);
2325 if (lwp
->pending_signals_to_report
!= NULL
)
2327 struct pending_signals
**p_sig
;
2329 p_sig
= &lwp
->pending_signals_to_report
;
2330 while ((*p_sig
)->prev
!= NULL
)
2331 p_sig
= &(*p_sig
)->prev
;
2333 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2334 if ((*p_sig
)->info
.si_signo
!= 0)
2335 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2341 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2342 WSTOPSIG (*wstat
), lwpid_of (thread
));
2346 struct pending_signals
*sig
;
2348 for (sig
= lwp
->pending_signals_to_report
;
2351 debug_printf (" Still queued %d\n",
2354 debug_printf (" (no more queued signals)\n");
2363 /* Fetch the possibly triggered data watchpoint info and store it in
2366 On some archs, like x86, that use debug registers to set
2367 watchpoints, it's possible that the way to know which watched
2368 address trapped, is to check the register that is used to select
2369 which address to watch. Problem is, between setting the watchpoint
2370 and reading back which data address trapped, the user may change
2371 the set of watchpoints, and, as a consequence, GDB changes the
2372 debug registers in the inferior. To avoid reading back a stale
2373 stopped-data-address when that happens, we cache in LP the fact
2374 that a watchpoint trapped, and the corresponding data address, as
2375 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2376 registers meanwhile, we have the cached data we can rely on. */
2379 check_stopped_by_watchpoint (struct lwp_info
*child
)
2381 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2383 struct thread_info
*saved_thread
;
2385 saved_thread
= current_thread
;
2386 current_thread
= get_lwp_thread (child
);
2388 if (the_low_target
.stopped_by_watchpoint ())
2390 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2392 if (the_low_target
.stopped_data_address
!= NULL
)
2393 child
->stopped_data_address
2394 = the_low_target
.stopped_data_address ();
2396 child
->stopped_data_address
= 0;
2399 current_thread
= saved_thread
;
2402 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2405 /* Return the ptrace options that we want to try to enable. */
2408 linux_low_ptrace_options (int attached
)
2413 options
|= PTRACE_O_EXITKILL
;
2415 if (report_fork_events
)
2416 options
|= PTRACE_O_TRACEFORK
;
2418 if (report_vfork_events
)
2419 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2421 if (report_exec_events
)
2422 options
|= PTRACE_O_TRACEEXEC
;
2424 options
|= PTRACE_O_TRACESYSGOOD
;
2429 /* Do low-level handling of the event, and check if we should go on
2430 and pass it to caller code. Return the affected lwp if we are, or
2433 static struct lwp_info
*
2434 linux_low_filter_event (int lwpid
, int wstat
)
2436 struct lwp_info
*child
;
2437 struct thread_info
*thread
;
2438 int have_stop_pc
= 0;
2440 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2442 /* Check for stop events reported by a process we didn't already
2443 know about - anything not already in our LWP list.
2445 If we're expecting to receive stopped processes after
2446 fork, vfork, and clone events, then we'll just add the
2447 new one to our list and go back to waiting for the event
2448 to be reported - the stopped process might be returned
2449 from waitpid before or after the event is.
2451 But note the case of a non-leader thread exec'ing after the
2452 leader having exited, and gone from our lists (because
2453 check_zombie_leaders deleted it). The non-leader thread
2454 changes its tid to the tgid. */
2456 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2457 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2461 /* A multi-thread exec after we had seen the leader exiting. */
2464 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2465 "after exec.\n", lwpid
);
2468 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2469 child
= add_lwp (child_ptid
);
2471 current_thread
= child
->thread
;
2474 /* If we didn't find a process, one of two things presumably happened:
2475 - A process we started and then detached from has exited. Ignore it.
2476 - A process we are controlling has forked and the new child's stop
2477 was reported to us by the kernel. Save its PID. */
2478 if (child
== NULL
&& WIFSTOPPED (wstat
))
2480 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2483 else if (child
== NULL
)
2486 thread
= get_lwp_thread (child
);
2490 child
->last_status
= wstat
;
2492 /* Check if the thread has exited. */
2493 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2496 debug_printf ("LLFE: %d exited.\n", lwpid
);
2498 if (finish_step_over (child
))
2500 /* Unsuspend all other LWPs, and set them back running again. */
2501 unsuspend_all_lwps (child
);
2504 /* If there is at least one more LWP, then the exit signal was
2505 not the end of the debugged application and should be
2506 ignored, unless GDB wants to hear about thread exits. */
2507 if (report_thread_events
2508 || last_thread_of_process_p (pid_of (thread
)))
2510 /* Since events are serialized to GDB core, and we can't
2511 report this one right now. Leave the status pending for
2512 the next time we're able to report it. */
2513 mark_lwp_dead (child
, wstat
);
2523 gdb_assert (WIFSTOPPED (wstat
));
2525 if (WIFSTOPPED (wstat
))
2527 struct process_info
*proc
;
2529 /* Architecture-specific setup after inferior is running. */
2530 proc
= find_process_pid (pid_of (thread
));
2531 if (proc
->tdesc
== NULL
)
2535 /* This needs to happen after we have attached to the
2536 inferior and it is stopped for the first time, but
2537 before we access any inferior registers. */
2538 linux_arch_setup_thread (thread
);
2542 /* The process is started, but GDBserver will do
2543 architecture-specific setup after the program stops at
2544 the first instruction. */
2545 child
->status_pending_p
= 1;
2546 child
->status_pending
= wstat
;
2552 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2554 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2555 int options
= linux_low_ptrace_options (proc
->attached
);
2557 linux_enable_event_reporting (lwpid
, options
);
2558 child
->must_set_ptrace_flags
= 0;
2561 /* Always update syscall_state, even if it will be filtered later. */
2562 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2564 child
->syscall_state
2565 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2566 ? TARGET_WAITKIND_SYSCALL_RETURN
2567 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2571 /* Almost all other ptrace-stops are known to be outside of system
2572 calls, with further exceptions in handle_extended_wait. */
2573 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2576 /* Be careful to not overwrite stop_pc until save_stop_reason is
2578 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2579 && linux_is_extended_waitstatus (wstat
))
2581 child
->stop_pc
= get_pc (child
);
2582 if (handle_extended_wait (&child
, wstat
))
2584 /* The event has been handled, so just return without
2590 if (linux_wstatus_maybe_breakpoint (wstat
))
2592 if (save_stop_reason (child
))
2597 child
->stop_pc
= get_pc (child
);
2599 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2600 && child
->stop_expected
)
2603 debug_printf ("Expected stop.\n");
2604 child
->stop_expected
= 0;
2606 if (thread
->last_resume_kind
== resume_stop
)
2608 /* We want to report the stop to the core. Treat the
2609 SIGSTOP as a normal event. */
2611 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2612 target_pid_to_str (ptid_of (thread
)));
2614 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2616 /* Stopping threads. We don't want this SIGSTOP to end up
2619 debug_printf ("LLW: SIGSTOP caught for %s "
2620 "while stopping threads.\n",
2621 target_pid_to_str (ptid_of (thread
)));
2626 /* This is a delayed SIGSTOP. Filter out the event. */
2628 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2629 child
->stepping
? "step" : "continue",
2630 target_pid_to_str (ptid_of (thread
)));
2632 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2637 child
->status_pending_p
= 1;
2638 child
->status_pending
= wstat
;
2642 /* Return true if THREAD is doing hardware single step. */
2645 maybe_hw_step (struct thread_info
*thread
)
2647 if (can_hardware_single_step ())
2651 /* GDBserver must insert single-step breakpoint for software
2653 gdb_assert (has_single_step_breakpoints (thread
));
2658 /* Resume LWPs that are currently stopped without any pending status
2659 to report, but are resumed from the core's perspective. */
2662 resume_stopped_resumed_lwps (struct inferior_list_entry
*entry
)
2664 struct thread_info
*thread
= (struct thread_info
*) entry
;
2665 struct lwp_info
*lp
= get_thread_lwp (thread
);
2669 && !lp
->status_pending_p
2670 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2674 if (thread
->last_resume_kind
== resume_step
)
2675 step
= maybe_hw_step (thread
);
2678 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2679 target_pid_to_str (ptid_of (thread
)),
2680 paddress (lp
->stop_pc
),
2683 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2687 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2688 match FILTER_PTID (leaving others pending). The PTIDs can be:
2689 minus_one_ptid, to specify any child; a pid PTID, specifying all
2690 lwps of a thread group; or a PTID representing a single lwp. Store
2691 the stop status through the status pointer WSTAT. OPTIONS is
2692 passed to the waitpid call. Return 0 if no event was found and
2693 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2694 was found. Return the PID of the stopped child otherwise. */
2697 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2698 int *wstatp
, int options
)
2700 struct thread_info
*event_thread
;
2701 struct lwp_info
*event_child
, *requested_child
;
2702 sigset_t block_mask
, prev_mask
;
2705 /* N.B. event_thread points to the thread_info struct that contains
2706 event_child. Keep them in sync. */
2707 event_thread
= NULL
;
2709 requested_child
= NULL
;
2711 /* Check for a lwp with a pending status. */
2713 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2715 event_thread
= (struct thread_info
*)
2716 find_inferior_in_random (&all_threads
, status_pending_p_callback
,
2718 if (event_thread
!= NULL
)
2719 event_child
= get_thread_lwp (event_thread
);
2720 if (debug_threads
&& event_thread
)
2721 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2723 else if (!ptid_equal (filter_ptid
, null_ptid
))
2725 requested_child
= find_lwp_pid (filter_ptid
);
2727 if (stopping_threads
== NOT_STOPPING_THREADS
2728 && requested_child
->status_pending_p
2729 && (requested_child
->collecting_fast_tracepoint
2730 != fast_tpoint_collect_result::not_collecting
))
2732 enqueue_one_deferred_signal (requested_child
,
2733 &requested_child
->status_pending
);
2734 requested_child
->status_pending_p
= 0;
2735 requested_child
->status_pending
= 0;
2736 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2739 if (requested_child
->suspended
2740 && requested_child
->status_pending_p
)
2742 internal_error (__FILE__
, __LINE__
,
2743 "requesting an event out of a"
2744 " suspended child?");
2747 if (requested_child
->status_pending_p
)
2749 event_child
= requested_child
;
2750 event_thread
= get_lwp_thread (event_child
);
2754 if (event_child
!= NULL
)
2757 debug_printf ("Got an event from pending child %ld (%04x)\n",
2758 lwpid_of (event_thread
), event_child
->status_pending
);
2759 *wstatp
= event_child
->status_pending
;
2760 event_child
->status_pending_p
= 0;
2761 event_child
->status_pending
= 0;
2762 current_thread
= event_thread
;
2763 return lwpid_of (event_thread
);
2766 /* But if we don't find a pending event, we'll have to wait.
2768 We only enter this loop if no process has a pending wait status.
2769 Thus any action taken in response to a wait status inside this
2770 loop is responding as soon as we detect the status, not after any
2773 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2774 all signals while here. */
2775 sigfillset (&block_mask
);
2776 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2778 /* Always pull all events out of the kernel. We'll randomly select
2779 an event LWP out of all that have events, to prevent
2781 while (event_child
== NULL
)
2785 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2788 - If the thread group leader exits while other threads in the
2789 thread group still exist, waitpid(TGID, ...) hangs. That
2790 waitpid won't return an exit status until the other threads
2791 in the group are reaped.
2793 - When a non-leader thread execs, that thread just vanishes
2794 without reporting an exit (so we'd hang if we waited for it
2795 explicitly in that case). The exec event is reported to
2798 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2801 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2802 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2808 debug_printf ("LLW: waitpid %ld received %s\n",
2809 (long) ret
, status_to_str (*wstatp
));
2812 /* Filter all events. IOW, leave all events pending. We'll
2813 randomly select an event LWP out of all that have events
2815 linux_low_filter_event (ret
, *wstatp
);
2816 /* Retry until nothing comes out of waitpid. A single
2817 SIGCHLD can indicate more than one child stopped. */
2821 /* Now that we've pulled all events out of the kernel, resume
2822 LWPs that don't have an interesting event to report. */
2823 if (stopping_threads
== NOT_STOPPING_THREADS
)
2824 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2826 /* ... and find an LWP with a status to report to the core, if
2828 event_thread
= (struct thread_info
*)
2829 find_inferior_in_random (&all_threads
, status_pending_p_callback
,
2831 if (event_thread
!= NULL
)
2833 event_child
= get_thread_lwp (event_thread
);
2834 *wstatp
= event_child
->status_pending
;
2835 event_child
->status_pending_p
= 0;
2836 event_child
->status_pending
= 0;
2840 /* Check for zombie thread group leaders. Those can't be reaped
2841 until all other threads in the thread group are. */
2842 check_zombie_leaders ();
2844 /* If there are no resumed children left in the set of LWPs we
2845 want to wait for, bail. We can't just block in
2846 waitpid/sigsuspend, because lwps might have been left stopped
2847 in trace-stop state, and we'd be stuck forever waiting for
2848 their status to change (which would only happen if we resumed
2849 them). Even if WNOHANG is set, this return code is preferred
2850 over 0 (below), as it is more detailed. */
2851 if ((find_inferior (&all_threads
,
2852 not_stopped_callback
,
2853 &wait_ptid
) == NULL
))
2856 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2857 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2861 /* No interesting event to report to the caller. */
2862 if ((options
& WNOHANG
))
2865 debug_printf ("WNOHANG set, no event found\n");
2867 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2871 /* Block until we get an event reported with SIGCHLD. */
2873 debug_printf ("sigsuspend'ing\n");
2875 sigsuspend (&prev_mask
);
2876 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2880 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2882 current_thread
= event_thread
;
2884 return lwpid_of (event_thread
);
2887 /* Wait for an event from child(ren) PTID. PTIDs can be:
2888 minus_one_ptid, to specify any child; a pid PTID, specifying all
2889 lwps of a thread group; or a PTID representing a single lwp. Store
2890 the stop status through the status pointer WSTAT. OPTIONS is
2891 passed to the waitpid call. Return 0 if no event was found and
2892 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2893 was found. Return the PID of the stopped child otherwise. */
2896 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2898 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2901 /* Count the LWP's that have had events. */
2904 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2906 struct thread_info
*thread
= (struct thread_info
*) entry
;
2907 struct lwp_info
*lp
= get_thread_lwp (thread
);
2908 int *count
= (int *) data
;
2910 gdb_assert (count
!= NULL
);
2912 /* Count only resumed LWPs that have an event pending. */
2913 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2914 && lp
->status_pending_p
)
2920 /* Select the LWP (if any) that is currently being single-stepped. */
2923 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2925 struct thread_info
*thread
= (struct thread_info
*) entry
;
2926 struct lwp_info
*lp
= get_thread_lwp (thread
);
2928 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2929 && thread
->last_resume_kind
== resume_step
2930 && lp
->status_pending_p
)
2936 /* Select the Nth LWP that has had an event. */
2939 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2941 struct thread_info
*thread
= (struct thread_info
*) entry
;
2942 struct lwp_info
*lp
= get_thread_lwp (thread
);
2943 int *selector
= (int *) data
;
2945 gdb_assert (selector
!= NULL
);
2947 /* Select only resumed LWPs that have an event pending. */
2948 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2949 && lp
->status_pending_p
)
2950 if ((*selector
)-- == 0)
2956 /* Select one LWP out of those that have events pending. */
2959 select_event_lwp (struct lwp_info
**orig_lp
)
2962 int random_selector
;
2963 struct thread_info
*event_thread
= NULL
;
2965 /* In all-stop, give preference to the LWP that is being
2966 single-stepped. There will be at most one, and it's the LWP that
2967 the core is most interested in. If we didn't do this, then we'd
2968 have to handle pending step SIGTRAPs somehow in case the core
2969 later continues the previously-stepped thread, otherwise we'd
2970 report the pending SIGTRAP, and the core, not having stepped the
2971 thread, wouldn't understand what the trap was for, and therefore
2972 would report it to the user as a random signal. */
2976 = (struct thread_info
*) find_inferior (&all_threads
,
2977 select_singlestep_lwp_callback
,
2979 if (event_thread
!= NULL
)
2982 debug_printf ("SEL: Select single-step %s\n",
2983 target_pid_to_str (ptid_of (event_thread
)));
2986 if (event_thread
== NULL
)
2988 /* No single-stepping LWP. Select one at random, out of those
2989 which have had events. */
2991 /* First see how many events we have. */
2992 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2993 gdb_assert (num_events
> 0);
2995 /* Now randomly pick a LWP out of those that have had
2997 random_selector
= (int)
2998 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
3000 if (debug_threads
&& num_events
> 1)
3001 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
3002 num_events
, random_selector
);
3005 = (struct thread_info
*) find_inferior (&all_threads
,
3006 select_event_lwp_callback
,
3010 if (event_thread
!= NULL
)
3012 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
3014 /* Switch the event LWP. */
3015 *orig_lp
= event_lp
;
3019 /* Decrement the suspend count of an LWP. */
3022 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
3024 struct thread_info
*thread
= (struct thread_info
*) entry
;
3025 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3027 /* Ignore EXCEPT. */
3031 lwp_suspended_decr (lwp
);
3035 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
3039 unsuspend_all_lwps (struct lwp_info
*except
)
3041 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
3044 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
3045 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
3047 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
3048 static ptid_t
linux_wait_1 (ptid_t ptid
,
3049 struct target_waitstatus
*ourstatus
,
3050 int target_options
);
3052 /* Stabilize threads (move out of jump pads).
3054 If a thread is midway collecting a fast tracepoint, we need to
3055 finish the collection and move it out of the jump pad before
3056 reporting the signal.
3058 This avoids recursion while collecting (when a signal arrives
3059 midway, and the signal handler itself collects), which would trash
3060 the trace buffer. In case the user set a breakpoint in a signal
3061 handler, this avoids the backtrace showing the jump pad, etc..
3062 Most importantly, there are certain things we can't do safely if
3063 threads are stopped in a jump pad (or in its callee's). For
3066 - starting a new trace run. A thread still collecting the
3067 previous run, could trash the trace buffer when resumed. The trace
3068 buffer control structures would have been reset but the thread had
3069 no way to tell. The thread could even midway memcpy'ing to the
3070 buffer, which would mean that when resumed, it would clobber the
3071 trace buffer that had been set for a new run.
3073 - we can't rewrite/reuse the jump pads for new tracepoints
3074 safely. Say you do tstart while a thread is stopped midway while
3075 collecting. When the thread is later resumed, it finishes the
3076 collection, and returns to the jump pad, to execute the original
3077 instruction that was under the tracepoint jump at the time the
3078 older run had been started. If the jump pad had been rewritten
3079 since for something else in the new run, the thread would now
3080 execute the wrong / random instructions. */
3083 linux_stabilize_threads (void)
3085 struct thread_info
*saved_thread
;
3086 struct thread_info
*thread_stuck
;
3089 = (struct thread_info
*) find_inferior (&all_threads
,
3090 stuck_in_jump_pad_callback
,
3092 if (thread_stuck
!= NULL
)
3095 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
3096 lwpid_of (thread_stuck
));
3100 saved_thread
= current_thread
;
3102 stabilizing_threads
= 1;
3105 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
3107 /* Loop until all are stopped out of the jump pads. */
3108 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
3110 struct target_waitstatus ourstatus
;
3111 struct lwp_info
*lwp
;
3114 /* Note that we go through the full wait even loop. While
3115 moving threads out of jump pad, we need to be able to step
3116 over internal breakpoints and such. */
3117 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
3119 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
3121 lwp
= get_thread_lwp (current_thread
);
3124 lwp_suspended_inc (lwp
);
3126 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3127 || current_thread
->last_resume_kind
== resume_stop
)
3129 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3130 enqueue_one_deferred_signal (lwp
, &wstat
);
3135 unsuspend_all_lwps (NULL
);
3137 stabilizing_threads
= 0;
3139 current_thread
= saved_thread
;
3144 = (struct thread_info
*) find_inferior (&all_threads
,
3145 stuck_in_jump_pad_callback
,
3147 if (thread_stuck
!= NULL
)
3148 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3149 lwpid_of (thread_stuck
));
3153 /* Convenience function that is called when the kernel reports an
3154 event that is not passed out to GDB. */
3157 ignore_event (struct target_waitstatus
*ourstatus
)
3159 /* If we got an event, there may still be others, as a single
3160 SIGCHLD can indicate more than one child stopped. This forces
3161 another target_wait call. */
3164 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3168 /* Convenience function that is called when the kernel reports an exit
3169 event. This decides whether to report the event to GDB as a
3170 process exit event, a thread exit event, or to suppress the
3174 filter_exit_event (struct lwp_info
*event_child
,
3175 struct target_waitstatus
*ourstatus
)
3177 struct thread_info
*thread
= get_lwp_thread (event_child
);
3178 ptid_t ptid
= ptid_of (thread
);
3180 if (!last_thread_of_process_p (pid_of (thread
)))
3182 if (report_thread_events
)
3183 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3185 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3187 delete_lwp (event_child
);
3192 /* Returns 1 if GDB is interested in any event_child syscalls. */
3195 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3197 struct thread_info
*thread
= get_lwp_thread (event_child
);
3198 struct process_info
*proc
= get_thread_process (thread
);
3200 return !VEC_empty (int, proc
->syscalls_to_catch
);
3203 /* Returns 1 if GDB is interested in the event_child syscall.
3204 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3207 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3211 struct thread_info
*thread
= get_lwp_thread (event_child
);
3212 struct process_info
*proc
= get_thread_process (thread
);
3214 if (VEC_empty (int, proc
->syscalls_to_catch
))
3217 if (VEC_index (int, proc
->syscalls_to_catch
, 0) == ANY_SYSCALL
)
3220 get_syscall_trapinfo (event_child
, &sysno
);
3222 VEC_iterate (int, proc
->syscalls_to_catch
, i
, iter
);
3230 /* Wait for process, returns status. */
3233 linux_wait_1 (ptid_t ptid
,
3234 struct target_waitstatus
*ourstatus
, int target_options
)
3237 struct lwp_info
*event_child
;
3240 int step_over_finished
;
3241 int bp_explains_trap
;
3242 int maybe_internal_trap
;
3251 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3254 /* Translate generic target options into linux options. */
3256 if (target_options
& TARGET_WNOHANG
)
3259 bp_explains_trap
= 0;
3262 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3264 /* Find a resumed LWP, if any. */
3265 if (find_inferior (&all_threads
,
3266 status_pending_p_callback
,
3267 &minus_one_ptid
) != NULL
)
3269 else if ((find_inferior (&all_threads
,
3270 not_stopped_callback
,
3271 &minus_one_ptid
) != NULL
))
3276 if (ptid_equal (step_over_bkpt
, null_ptid
))
3277 pid
= linux_wait_for_event (ptid
, &w
, options
);
3281 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3282 target_pid_to_str (step_over_bkpt
));
3283 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3286 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3288 gdb_assert (target_options
& TARGET_WNOHANG
);
3292 debug_printf ("linux_wait_1 ret = null_ptid, "
3293 "TARGET_WAITKIND_IGNORE\n");
3297 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3304 debug_printf ("linux_wait_1 ret = null_ptid, "
3305 "TARGET_WAITKIND_NO_RESUMED\n");
3309 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3313 event_child
= get_thread_lwp (current_thread
);
3315 /* linux_wait_for_event only returns an exit status for the last
3316 child of a process. Report it. */
3317 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3321 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3322 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3326 debug_printf ("linux_wait_1 ret = %s, exited with "
3328 target_pid_to_str (ptid_of (current_thread
)),
3335 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3336 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3340 debug_printf ("linux_wait_1 ret = %s, terminated with "
3342 target_pid_to_str (ptid_of (current_thread
)),
3348 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3349 return filter_exit_event (event_child
, ourstatus
);
3351 return ptid_of (current_thread
);
3354 /* If step-over executes a breakpoint instruction, in the case of a
3355 hardware single step it means a gdb/gdbserver breakpoint had been
3356 planted on top of a permanent breakpoint, in the case of a software
3357 single step it may just mean that gdbserver hit the reinsert breakpoint.
3358 The PC has been adjusted by save_stop_reason to point at
3359 the breakpoint address.
3360 So in the case of the hardware single step advance the PC manually
3361 past the breakpoint and in the case of software single step advance only
3362 if it's not the single_step_breakpoint we are hitting.
3363 This avoids that a program would keep trapping a permanent breakpoint
3365 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3366 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3367 && (event_child
->stepping
3368 || !single_step_breakpoint_inserted_here (event_child
->stop_pc
)))
3370 int increment_pc
= 0;
3371 int breakpoint_kind
= 0;
3372 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3375 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3376 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3380 debug_printf ("step-over for %s executed software breakpoint\n",
3381 target_pid_to_str (ptid_of (current_thread
)));
3384 if (increment_pc
!= 0)
3386 struct regcache
*regcache
3387 = get_thread_regcache (current_thread
, 1);
3389 event_child
->stop_pc
+= increment_pc
;
3390 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3392 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3393 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3397 /* If this event was not handled before, and is not a SIGTRAP, we
3398 report it. SIGILL and SIGSEGV are also treated as traps in case
3399 a breakpoint is inserted at the current PC. If this target does
3400 not support internal breakpoints at all, we also report the
3401 SIGTRAP without further processing; it's of no concern to us. */
3403 = (supports_breakpoints ()
3404 && (WSTOPSIG (w
) == SIGTRAP
3405 || ((WSTOPSIG (w
) == SIGILL
3406 || WSTOPSIG (w
) == SIGSEGV
)
3407 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3409 if (maybe_internal_trap
)
3411 /* Handle anything that requires bookkeeping before deciding to
3412 report the event or continue waiting. */
3414 /* First check if we can explain the SIGTRAP with an internal
3415 breakpoint, or if we should possibly report the event to GDB.
3416 Do this before anything that may remove or insert a
3418 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3420 /* We have a SIGTRAP, possibly a step-over dance has just
3421 finished. If so, tweak the state machine accordingly,
3422 reinsert breakpoints and delete any single-step
3424 step_over_finished
= finish_step_over (event_child
);
3426 /* Now invoke the callbacks of any internal breakpoints there. */
3427 check_breakpoints (event_child
->stop_pc
);
3429 /* Handle tracepoint data collecting. This may overflow the
3430 trace buffer, and cause a tracing stop, removing
3432 trace_event
= handle_tracepoints (event_child
);
3434 if (bp_explains_trap
)
3437 debug_printf ("Hit a gdbserver breakpoint.\n");
3442 /* We have some other signal, possibly a step-over dance was in
3443 progress, and it should be cancelled too. */
3444 step_over_finished
= finish_step_over (event_child
);
3447 /* We have all the data we need. Either report the event to GDB, or
3448 resume threads and keep waiting for more. */
3450 /* If we're collecting a fast tracepoint, finish the collection and
3451 move out of the jump pad before delivering a signal. See
3452 linux_stabilize_threads. */
3455 && WSTOPSIG (w
) != SIGTRAP
3456 && supports_fast_tracepoints ()
3457 && agent_loaded_p ())
3460 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3461 "to defer or adjust it.\n",
3462 WSTOPSIG (w
), lwpid_of (current_thread
));
3464 /* Allow debugging the jump pad itself. */
3465 if (current_thread
->last_resume_kind
!= resume_step
3466 && maybe_move_out_of_jump_pad (event_child
, &w
))
3468 enqueue_one_deferred_signal (event_child
, &w
);
3471 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3472 WSTOPSIG (w
), lwpid_of (current_thread
));
3474 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3478 return ignore_event (ourstatus
);
3482 if (event_child
->collecting_fast_tracepoint
3483 != fast_tpoint_collect_result::not_collecting
)
3486 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3487 "Check if we're already there.\n",
3488 lwpid_of (current_thread
),
3489 (int) event_child
->collecting_fast_tracepoint
);
3493 event_child
->collecting_fast_tracepoint
3494 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3496 if (event_child
->collecting_fast_tracepoint
3497 != fast_tpoint_collect_result::before_insn
)
3499 /* No longer need this breakpoint. */
3500 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3503 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3504 "stopping all threads momentarily.\n");
3506 /* Other running threads could hit this breakpoint.
3507 We don't handle moribund locations like GDB does,
3508 instead we always pause all threads when removing
3509 breakpoints, so that any step-over or
3510 decr_pc_after_break adjustment is always taken
3511 care of while the breakpoint is still
3513 stop_all_lwps (1, event_child
);
3515 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3516 event_child
->exit_jump_pad_bkpt
= NULL
;
3518 unstop_all_lwps (1, event_child
);
3520 gdb_assert (event_child
->suspended
>= 0);
3524 if (event_child
->collecting_fast_tracepoint
3525 == fast_tpoint_collect_result::not_collecting
)
3528 debug_printf ("fast tracepoint finished "
3529 "collecting successfully.\n");
3531 /* We may have a deferred signal to report. */
3532 if (dequeue_one_deferred_signal (event_child
, &w
))
3535 debug_printf ("dequeued one signal.\n");
3540 debug_printf ("no deferred signals.\n");
3542 if (stabilizing_threads
)
3544 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3545 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3549 debug_printf ("linux_wait_1 ret = %s, stopped "
3550 "while stabilizing threads\n",
3551 target_pid_to_str (ptid_of (current_thread
)));
3555 return ptid_of (current_thread
);
3561 /* Check whether GDB would be interested in this event. */
3563 /* Check if GDB is interested in this syscall. */
3565 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3566 && !gdb_catch_this_syscall_p (event_child
))
3570 debug_printf ("Ignored syscall for LWP %ld.\n",
3571 lwpid_of (current_thread
));
3574 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3579 return ignore_event (ourstatus
);
3582 /* If GDB is not interested in this signal, don't stop other
3583 threads, and don't report it to GDB. Just resume the inferior
3584 right away. We do this for threading-related signals as well as
3585 any that GDB specifically requested we ignore. But never ignore
3586 SIGSTOP if we sent it ourselves, and do not ignore signals when
3587 stepping - they may require special handling to skip the signal
3588 handler. Also never ignore signals that could be caused by a
3591 && current_thread
->last_resume_kind
!= resume_step
3593 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3594 (current_process ()->priv
->thread_db
!= NULL
3595 && (WSTOPSIG (w
) == __SIGRTMIN
3596 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3599 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3600 && !(WSTOPSIG (w
) == SIGSTOP
3601 && current_thread
->last_resume_kind
== resume_stop
)
3602 && !linux_wstatus_maybe_breakpoint (w
))))
3604 siginfo_t info
, *info_p
;
3607 debug_printf ("Ignored signal %d for LWP %ld.\n",
3608 WSTOPSIG (w
), lwpid_of (current_thread
));
3610 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3611 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3616 if (step_over_finished
)
3618 /* We cancelled this thread's step-over above. We still
3619 need to unsuspend all other LWPs, and set them back
3620 running again while the signal handler runs. */
3621 unsuspend_all_lwps (event_child
);
3623 /* Enqueue the pending signal info so that proceed_all_lwps
3625 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3627 proceed_all_lwps ();
3631 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3632 WSTOPSIG (w
), info_p
);
3638 return ignore_event (ourstatus
);
3641 /* Note that all addresses are always "out of the step range" when
3642 there's no range to begin with. */
3643 in_step_range
= lwp_in_step_range (event_child
);
3645 /* If GDB wanted this thread to single step, and the thread is out
3646 of the step range, we always want to report the SIGTRAP, and let
3647 GDB handle it. Watchpoints should always be reported. So should
3648 signals we can't explain. A SIGTRAP we can't explain could be a
3649 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3650 do, we're be able to handle GDB breakpoints on top of internal
3651 breakpoints, by handling the internal breakpoint and still
3652 reporting the event to GDB. If we don't, we're out of luck, GDB
3653 won't see the breakpoint hit. If we see a single-step event but
3654 the thread should be continuing, don't pass the trap to gdb.
3655 That indicates that we had previously finished a single-step but
3656 left the single-step pending -- see
3657 complete_ongoing_step_over. */
3658 report_to_gdb
= (!maybe_internal_trap
3659 || (current_thread
->last_resume_kind
== resume_step
3661 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3663 && !bp_explains_trap
3665 && !step_over_finished
3666 && !(current_thread
->last_resume_kind
== resume_continue
3667 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3668 || (gdb_breakpoint_here (event_child
->stop_pc
)
3669 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3670 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3671 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3673 run_breakpoint_commands (event_child
->stop_pc
);
3675 /* We found no reason GDB would want us to stop. We either hit one
3676 of our own breakpoints, or finished an internal step GDB
3677 shouldn't know about. */
3682 if (bp_explains_trap
)
3683 debug_printf ("Hit a gdbserver breakpoint.\n");
3684 if (step_over_finished
)
3685 debug_printf ("Step-over finished.\n");
3687 debug_printf ("Tracepoint event.\n");
3688 if (lwp_in_step_range (event_child
))
3689 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3690 paddress (event_child
->stop_pc
),
3691 paddress (event_child
->step_range_start
),
3692 paddress (event_child
->step_range_end
));
3695 /* We're not reporting this breakpoint to GDB, so apply the
3696 decr_pc_after_break adjustment to the inferior's regcache
3699 if (the_low_target
.set_pc
!= NULL
)
3701 struct regcache
*regcache
3702 = get_thread_regcache (current_thread
, 1);
3703 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3706 if (step_over_finished
)
3708 /* If we have finished stepping over a breakpoint, we've
3709 stopped and suspended all LWPs momentarily except the
3710 stepping one. This is where we resume them all again.
3711 We're going to keep waiting, so use proceed, which
3712 handles stepping over the next breakpoint. */
3713 unsuspend_all_lwps (event_child
);
3717 /* Remove the single-step breakpoints if any. Note that
3718 there isn't single-step breakpoint if we finished stepping
3720 if (can_software_single_step ()
3721 && has_single_step_breakpoints (current_thread
))
3723 stop_all_lwps (0, event_child
);
3724 delete_single_step_breakpoints (current_thread
);
3725 unstop_all_lwps (0, event_child
);
3730 debug_printf ("proceeding all threads.\n");
3731 proceed_all_lwps ();
3736 return ignore_event (ourstatus
);
3741 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3744 = target_waitstatus_to_string (&event_child
->waitstatus
);
3746 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3747 lwpid_of (get_lwp_thread (event_child
)), str
.c_str ());
3749 if (current_thread
->last_resume_kind
== resume_step
)
3751 if (event_child
->step_range_start
== event_child
->step_range_end
)
3752 debug_printf ("GDB wanted to single-step, reporting event.\n");
3753 else if (!lwp_in_step_range (event_child
))
3754 debug_printf ("Out of step range, reporting event.\n");
3756 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3757 debug_printf ("Stopped by watchpoint.\n");
3758 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3759 debug_printf ("Stopped by GDB breakpoint.\n");
3761 debug_printf ("Hit a non-gdbserver trap event.\n");
3764 /* Alright, we're going to report a stop. */
3766 /* Remove single-step breakpoints. */
3767 if (can_software_single_step ())
3769 /* Remove single-step breakpoints or not. It it is true, stop all
3770 lwps, so that other threads won't hit the breakpoint in the
3772 int remove_single_step_breakpoints_p
= 0;
3776 remove_single_step_breakpoints_p
3777 = has_single_step_breakpoints (current_thread
);
3781 /* In all-stop, a stop reply cancels all previous resume
3782 requests. Delete all single-step breakpoints. */
3783 struct inferior_list_entry
*inf
, *tmp
;
3785 ALL_INFERIORS (&all_threads
, inf
, tmp
)
3787 struct thread_info
*thread
= (struct thread_info
*) inf
;
3789 if (has_single_step_breakpoints (thread
))
3791 remove_single_step_breakpoints_p
= 1;
3797 if (remove_single_step_breakpoints_p
)
3799 /* If we remove single-step breakpoints from memory, stop all lwps,
3800 so that other threads won't hit the breakpoint in the staled
3802 stop_all_lwps (0, event_child
);
3806 gdb_assert (has_single_step_breakpoints (current_thread
));
3807 delete_single_step_breakpoints (current_thread
);
3811 struct inferior_list_entry
*inf
, *tmp
;
3813 ALL_INFERIORS (&all_threads
, inf
, tmp
)
3815 struct thread_info
*thread
= (struct thread_info
*) inf
;
3817 if (has_single_step_breakpoints (thread
))
3818 delete_single_step_breakpoints (thread
);
3822 unstop_all_lwps (0, event_child
);
3826 if (!stabilizing_threads
)
3828 /* In all-stop, stop all threads. */
3830 stop_all_lwps (0, NULL
);
3832 if (step_over_finished
)
3836 /* If we were doing a step-over, all other threads but
3837 the stepping one had been paused in start_step_over,
3838 with their suspend counts incremented. We don't want
3839 to do a full unstop/unpause, because we're in
3840 all-stop mode (so we want threads stopped), but we
3841 still need to unsuspend the other threads, to
3842 decrement their `suspended' count back. */
3843 unsuspend_all_lwps (event_child
);
3847 /* If we just finished a step-over, then all threads had
3848 been momentarily paused. In all-stop, that's fine,
3849 we want threads stopped by now anyway. In non-stop,
3850 we need to re-resume threads that GDB wanted to be
3852 unstop_all_lwps (1, event_child
);
3856 /* If we're not waiting for a specific LWP, choose an event LWP
3857 from among those that have had events. Giving equal priority
3858 to all LWPs that have had events helps prevent
3860 if (ptid_equal (ptid
, minus_one_ptid
))
3862 event_child
->status_pending_p
= 1;
3863 event_child
->status_pending
= w
;
3865 select_event_lwp (&event_child
);
3867 /* current_thread and event_child must stay in sync. */
3868 current_thread
= get_lwp_thread (event_child
);
3870 event_child
->status_pending_p
= 0;
3871 w
= event_child
->status_pending
;
3875 /* Stabilize threads (move out of jump pads). */
3877 stabilize_threads ();
3881 /* If we just finished a step-over, then all threads had been
3882 momentarily paused. In all-stop, that's fine, we want
3883 threads stopped by now anyway. In non-stop, we need to
3884 re-resume threads that GDB wanted to be running. */
3885 if (step_over_finished
)
3886 unstop_all_lwps (1, event_child
);
3889 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3891 /* If the reported event is an exit, fork, vfork or exec, let
3894 /* Break the unreported fork relationship chain. */
3895 if (event_child
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
3896 || event_child
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
)
3898 event_child
->fork_relative
->fork_relative
= NULL
;
3899 event_child
->fork_relative
= NULL
;
3902 *ourstatus
= event_child
->waitstatus
;
3903 /* Clear the event lwp's waitstatus since we handled it already. */
3904 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3907 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3909 /* Now that we've selected our final event LWP, un-adjust its PC if
3910 it was a software breakpoint, and the client doesn't know we can
3911 adjust the breakpoint ourselves. */
3912 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3913 && !swbreak_feature
)
3915 int decr_pc
= the_low_target
.decr_pc_after_break
;
3919 struct regcache
*regcache
3920 = get_thread_regcache (current_thread
, 1);
3921 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3925 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3927 get_syscall_trapinfo (event_child
,
3928 &ourstatus
->value
.syscall_number
);
3929 ourstatus
->kind
= event_child
->syscall_state
;
3931 else if (current_thread
->last_resume_kind
== resume_stop
3932 && WSTOPSIG (w
) == SIGSTOP
)
3934 /* A thread that has been requested to stop by GDB with vCont;t,
3935 and it stopped cleanly, so report as SIG0. The use of
3936 SIGSTOP is an implementation detail. */
3937 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3939 else if (current_thread
->last_resume_kind
== resume_stop
3940 && WSTOPSIG (w
) != SIGSTOP
)
3942 /* A thread that has been requested to stop by GDB with vCont;t,
3943 but, it stopped for other reasons. */
3944 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3946 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3948 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3951 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3955 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3956 target_pid_to_str (ptid_of (current_thread
)),
3957 ourstatus
->kind
, ourstatus
->value
.sig
);
3961 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3962 return filter_exit_event (event_child
, ourstatus
);
3964 return ptid_of (current_thread
);
3967 /* Get rid of any pending event in the pipe. */
3969 async_file_flush (void)
3975 ret
= read (linux_event_pipe
[0], &buf
, 1);
3976 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3979 /* Put something in the pipe, so the event loop wakes up. */
3981 async_file_mark (void)
3985 async_file_flush ();
3988 ret
= write (linux_event_pipe
[1], "+", 1);
3989 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3991 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3992 be awakened anyway. */
3996 linux_wait (ptid_t ptid
,
3997 struct target_waitstatus
*ourstatus
, int target_options
)
4001 /* Flush the async file first. */
4002 if (target_is_async_p ())
4003 async_file_flush ();
4007 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
4009 while ((target_options
& TARGET_WNOHANG
) == 0
4010 && ptid_equal (event_ptid
, null_ptid
)
4011 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
4013 /* If at least one stop was reported, there may be more. A single
4014 SIGCHLD can signal more than one child stop. */
4015 if (target_is_async_p ()
4016 && (target_options
& TARGET_WNOHANG
) != 0
4017 && !ptid_equal (event_ptid
, null_ptid
))
4023 /* Send a signal to an LWP. */
4026 kill_lwp (unsigned long lwpid
, int signo
)
4031 ret
= syscall (__NR_tkill
, lwpid
, signo
);
4032 if (errno
== ENOSYS
)
4034 /* If tkill fails, then we are not using nptl threads, a
4035 configuration we no longer support. */
4036 perror_with_name (("tkill"));
4042 linux_stop_lwp (struct lwp_info
*lwp
)
4048 send_sigstop (struct lwp_info
*lwp
)
4052 pid
= lwpid_of (get_lwp_thread (lwp
));
4054 /* If we already have a pending stop signal for this process, don't
4056 if (lwp
->stop_expected
)
4059 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
4065 debug_printf ("Sending sigstop to lwp %d\n", pid
);
4067 lwp
->stop_expected
= 1;
4068 kill_lwp (pid
, SIGSTOP
);
4072 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
4074 struct thread_info
*thread
= (struct thread_info
*) entry
;
4075 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4077 /* Ignore EXCEPT. */
4088 /* Increment the suspend count of an LWP, and stop it, if not stopped
4091 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
4094 struct thread_info
*thread
= (struct thread_info
*) entry
;
4095 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4097 /* Ignore EXCEPT. */
4101 lwp_suspended_inc (lwp
);
4103 return send_sigstop_callback (entry
, except
);
4107 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
4109 /* Store the exit status for later. */
4110 lwp
->status_pending_p
= 1;
4111 lwp
->status_pending
= wstat
;
4113 /* Store in waitstatus as well, as there's nothing else to process
4115 if (WIFEXITED (wstat
))
4117 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
4118 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
4120 else if (WIFSIGNALED (wstat
))
4122 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
4123 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
4126 /* Prevent trying to stop it. */
4129 /* No further stops are expected from a dead lwp. */
4130 lwp
->stop_expected
= 0;
4133 /* Return true if LWP has exited already, and has a pending exit event
4134 to report to GDB. */
4137 lwp_is_marked_dead (struct lwp_info
*lwp
)
4139 return (lwp
->status_pending_p
4140 && (WIFEXITED (lwp
->status_pending
)
4141 || WIFSIGNALED (lwp
->status_pending
)));
4144 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4147 wait_for_sigstop (void)
4149 struct thread_info
*saved_thread
;
4154 saved_thread
= current_thread
;
4155 if (saved_thread
!= NULL
)
4156 saved_tid
= saved_thread
->entry
.id
;
4158 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4161 debug_printf ("wait_for_sigstop: pulling events\n");
4163 /* Passing NULL_PTID as filter indicates we want all events to be
4164 left pending. Eventually this returns when there are no
4165 unwaited-for children left. */
4166 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4168 gdb_assert (ret
== -1);
4170 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4171 current_thread
= saved_thread
;
4175 debug_printf ("Previously current thread died.\n");
4177 /* We can't change the current inferior behind GDB's back,
4178 otherwise, a subsequent command may apply to the wrong
4180 current_thread
= NULL
;
4184 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
4185 move it out, because we need to report the stop event to GDB. For
4186 example, if the user puts a breakpoint in the jump pad, it's
4187 because she wants to debug it. */
4190 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
4192 struct thread_info
*thread
= (struct thread_info
*) entry
;
4193 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4195 if (lwp
->suspended
!= 0)
4197 internal_error (__FILE__
, __LINE__
,
4198 "LWP %ld is suspended, suspended=%d\n",
4199 lwpid_of (thread
), lwp
->suspended
);
4201 gdb_assert (lwp
->stopped
);
4203 /* Allow debugging the jump pad, gdb_collect, etc.. */
4204 return (supports_fast_tracepoints ()
4205 && agent_loaded_p ()
4206 && (gdb_breakpoint_here (lwp
->stop_pc
)
4207 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4208 || thread
->last_resume_kind
== resume_step
)
4209 && (linux_fast_tracepoint_collecting (lwp
, NULL
)
4210 != fast_tpoint_collect_result::not_collecting
));
4214 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
4216 struct thread_info
*thread
= (struct thread_info
*) entry
;
4217 struct thread_info
*saved_thread
;
4218 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4221 if (lwp
->suspended
!= 0)
4223 internal_error (__FILE__
, __LINE__
,
4224 "LWP %ld is suspended, suspended=%d\n",
4225 lwpid_of (thread
), lwp
->suspended
);
4227 gdb_assert (lwp
->stopped
);
4229 /* For gdb_breakpoint_here. */
4230 saved_thread
= current_thread
;
4231 current_thread
= thread
;
4233 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4235 /* Allow debugging the jump pad, gdb_collect, etc. */
4236 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4237 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4238 && thread
->last_resume_kind
!= resume_step
4239 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4242 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4247 lwp
->status_pending_p
= 0;
4248 enqueue_one_deferred_signal (lwp
, wstat
);
4251 debug_printf ("Signal %d for LWP %ld deferred "
4253 WSTOPSIG (*wstat
), lwpid_of (thread
));
4256 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4259 lwp_suspended_inc (lwp
);
4261 current_thread
= saved_thread
;
4265 lwp_running (struct inferior_list_entry
*entry
, void *data
)
4267 struct thread_info
*thread
= (struct thread_info
*) entry
;
4268 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4270 if (lwp_is_marked_dead (lwp
))
4277 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4278 If SUSPEND, then also increase the suspend count of every LWP,
4282 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4284 /* Should not be called recursively. */
4285 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4290 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4291 suspend
? "stop-and-suspend" : "stop",
4293 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4297 stopping_threads
= (suspend
4298 ? STOPPING_AND_SUSPENDING_THREADS
4299 : STOPPING_THREADS
);
4302 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
4304 find_inferior (&all_threads
, send_sigstop_callback
, except
);
4305 wait_for_sigstop ();
4306 stopping_threads
= NOT_STOPPING_THREADS
;
4310 debug_printf ("stop_all_lwps done, setting stopping_threads "
4311 "back to !stopping\n");
4316 /* Enqueue one signal in the chain of signals which need to be
4317 delivered to this process on next resume. */
4320 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4322 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4324 p_sig
->prev
= lwp
->pending_signals
;
4325 p_sig
->signal
= signal
;
4327 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4329 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4330 lwp
->pending_signals
= p_sig
;
4333 /* Install breakpoints for software single stepping. */
4336 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4338 struct thread_info
*thread
= get_lwp_thread (lwp
);
4339 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4340 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
4342 current_thread
= thread
;
4343 std::vector
<CORE_ADDR
> next_pcs
= the_low_target
.get_next_pcs (regcache
);
4345 for (CORE_ADDR pc
: next_pcs
)
4346 set_single_step_breakpoint (pc
, current_ptid
);
4348 do_cleanups (old_chain
);
4351 /* Single step via hardware or software single step.
4352 Return 1 if hardware single stepping, 0 if software single stepping
4353 or can't single step. */
4356 single_step (struct lwp_info
* lwp
)
4360 if (can_hardware_single_step ())
4364 else if (can_software_single_step ())
4366 install_software_single_step_breakpoints (lwp
);
4372 debug_printf ("stepping is not implemented on this target");
4378 /* The signal can be delivered to the inferior if we are not trying to
4379 finish a fast tracepoint collect. Since signal can be delivered in
4380 the step-over, the program may go to signal handler and trap again
4381 after return from the signal handler. We can live with the spurious
4385 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4387 return (lwp
->collecting_fast_tracepoint
4388 == fast_tpoint_collect_result::not_collecting
);
4391 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4392 SIGNAL is nonzero, give it that signal. */
4395 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4396 int step
, int signal
, siginfo_t
*info
)
4398 struct thread_info
*thread
= get_lwp_thread (lwp
);
4399 struct thread_info
*saved_thread
;
4401 struct process_info
*proc
= get_thread_process (thread
);
4403 /* Note that target description may not be initialised
4404 (proc->tdesc == NULL) at this point because the program hasn't
4405 stopped at the first instruction yet. It means GDBserver skips
4406 the extra traps from the wrapper program (see option --wrapper).
4407 Code in this function that requires register access should be
4408 guarded by proc->tdesc == NULL or something else. */
4410 if (lwp
->stopped
== 0)
4413 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4415 fast_tpoint_collect_result fast_tp_collecting
4416 = lwp
->collecting_fast_tracepoint
;
4418 gdb_assert (!stabilizing_threads
4419 || (fast_tp_collecting
4420 != fast_tpoint_collect_result::not_collecting
));
4422 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4423 user used the "jump" command, or "set $pc = foo"). */
4424 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4426 /* Collecting 'while-stepping' actions doesn't make sense
4428 release_while_stepping_state_list (thread
);
4431 /* If we have pending signals or status, and a new signal, enqueue the
4432 signal. Also enqueue the signal if it can't be delivered to the
4433 inferior right now. */
4435 && (lwp
->status_pending_p
4436 || lwp
->pending_signals
!= NULL
4437 || !lwp_signal_can_be_delivered (lwp
)))
4439 enqueue_pending_signal (lwp
, signal
, info
);
4441 /* Postpone any pending signal. It was enqueued above. */
4445 if (lwp
->status_pending_p
)
4448 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4449 " has pending status\n",
4450 lwpid_of (thread
), step
? "step" : "continue",
4451 lwp
->stop_expected
? "expected" : "not expected");
4455 saved_thread
= current_thread
;
4456 current_thread
= thread
;
4458 /* This bit needs some thinking about. If we get a signal that
4459 we must report while a single-step reinsert is still pending,
4460 we often end up resuming the thread. It might be better to
4461 (ew) allow a stack of pending events; then we could be sure that
4462 the reinsert happened right away and not lose any signals.
4464 Making this stack would also shrink the window in which breakpoints are
4465 uninserted (see comment in linux_wait_for_lwp) but not enough for
4466 complete correctness, so it won't solve that problem. It may be
4467 worthwhile just to solve this one, however. */
4468 if (lwp
->bp_reinsert
!= 0)
4471 debug_printf (" pending reinsert at 0x%s\n",
4472 paddress (lwp
->bp_reinsert
));
4474 if (can_hardware_single_step ())
4476 if (fast_tp_collecting
== fast_tpoint_collect_result::not_collecting
)
4479 warning ("BAD - reinserting but not stepping.");
4481 warning ("BAD - reinserting and suspended(%d).",
4486 step
= maybe_hw_step (thread
);
4489 if (fast_tp_collecting
== fast_tpoint_collect_result::before_insn
)
4492 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4493 " (exit-jump-pad-bkpt)\n",
4496 else if (fast_tp_collecting
== fast_tpoint_collect_result::at_insn
)
4499 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4500 " single-stepping\n",
4503 if (can_hardware_single_step ())
4507 internal_error (__FILE__
, __LINE__
,
4508 "moving out of jump pad single-stepping"
4509 " not implemented on this target");
4513 /* If we have while-stepping actions in this thread set it stepping.
4514 If we have a signal to deliver, it may or may not be set to
4515 SIG_IGN, we don't know. Assume so, and allow collecting
4516 while-stepping into a signal handler. A possible smart thing to
4517 do would be to set an internal breakpoint at the signal return
4518 address, continue, and carry on catching this while-stepping
4519 action only when that breakpoint is hit. A future
4521 if (thread
->while_stepping
!= NULL
)
4524 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4527 step
= single_step (lwp
);
4530 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4532 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4534 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4538 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4539 (long) lwp
->stop_pc
);
4543 /* If we have pending signals, consume one if it can be delivered to
4545 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4547 struct pending_signals
**p_sig
;
4549 p_sig
= &lwp
->pending_signals
;
4550 while ((*p_sig
)->prev
!= NULL
)
4551 p_sig
= &(*p_sig
)->prev
;
4553 signal
= (*p_sig
)->signal
;
4554 if ((*p_sig
)->info
.si_signo
!= 0)
4555 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4563 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4564 lwpid_of (thread
), step
? "step" : "continue", signal
,
4565 lwp
->stop_expected
? "expected" : "not expected");
4567 if (the_low_target
.prepare_to_resume
!= NULL
)
4568 the_low_target
.prepare_to_resume (lwp
);
4570 regcache_invalidate_thread (thread
);
4572 lwp
->stepping
= step
;
4574 ptrace_request
= PTRACE_SINGLESTEP
;
4575 else if (gdb_catching_syscalls_p (lwp
))
4576 ptrace_request
= PTRACE_SYSCALL
;
4578 ptrace_request
= PTRACE_CONT
;
4579 ptrace (ptrace_request
,
4581 (PTRACE_TYPE_ARG3
) 0,
4582 /* Coerce to a uintptr_t first to avoid potential gcc warning
4583 of coercing an 8 byte integer to a 4 byte pointer. */
4584 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4586 current_thread
= saved_thread
;
4588 perror_with_name ("resuming thread");
4590 /* Successfully resumed. Clear state that no longer makes sense,
4591 and mark the LWP as running. Must not do this before resuming
4592 otherwise if that fails other code will be confused. E.g., we'd
4593 later try to stop the LWP and hang forever waiting for a stop
4594 status. Note that we must not throw after this is cleared,
4595 otherwise handle_zombie_lwp_error would get confused. */
4597 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4600 /* Called when we try to resume a stopped LWP and that errors out. If
4601 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4602 or about to become), discard the error, clear any pending status
4603 the LWP may have, and return true (we'll collect the exit status
4604 soon enough). Otherwise, return false. */
4607 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4609 struct thread_info
*thread
= get_lwp_thread (lp
);
4611 /* If we get an error after resuming the LWP successfully, we'd
4612 confuse !T state for the LWP being gone. */
4613 gdb_assert (lp
->stopped
);
4615 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4616 because even if ptrace failed with ESRCH, the tracee may be "not
4617 yet fully dead", but already refusing ptrace requests. In that
4618 case the tracee has 'R (Running)' state for a little bit
4619 (observed in Linux 3.18). See also the note on ESRCH in the
4620 ptrace(2) man page. Instead, check whether the LWP has any state
4621 other than ptrace-stopped. */
4623 /* Don't assume anything if /proc/PID/status can't be read. */
4624 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4626 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4627 lp
->status_pending_p
= 0;
4633 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4634 disappears while we try to resume it. */
4637 linux_resume_one_lwp (struct lwp_info
*lwp
,
4638 int step
, int signal
, siginfo_t
*info
)
4642 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4644 CATCH (ex
, RETURN_MASK_ERROR
)
4646 if (!check_ptrace_stopped_lwp_gone (lwp
))
4647 throw_exception (ex
);
4652 struct thread_resume_array
4654 struct thread_resume
*resume
;
4658 /* This function is called once per thread via find_inferior.
4659 ARG is a pointer to a thread_resume_array struct.
4660 We look up the thread specified by ENTRY in ARG, and mark the thread
4661 with a pointer to the appropriate resume request.
4663 This algorithm is O(threads * resume elements), but resume elements
4664 is small (and will remain small at least until GDB supports thread
4668 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
4670 struct thread_info
*thread
= (struct thread_info
*) entry
;
4671 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4673 struct thread_resume_array
*r
;
4675 r
= (struct thread_resume_array
*) arg
;
4677 for (ndx
= 0; ndx
< r
->n
; ndx
++)
4679 ptid_t ptid
= r
->resume
[ndx
].thread
;
4680 if (ptid_equal (ptid
, minus_one_ptid
)
4681 || ptid_equal (ptid
, entry
->id
)
4682 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4684 || (ptid_get_pid (ptid
) == pid_of (thread
)
4685 && (ptid_is_pid (ptid
)
4686 || ptid_get_lwp (ptid
) == -1)))
4688 if (r
->resume
[ndx
].kind
== resume_stop
4689 && thread
->last_resume_kind
== resume_stop
)
4692 debug_printf ("already %s LWP %ld at GDB's request\n",
4693 (thread
->last_status
.kind
4694 == TARGET_WAITKIND_STOPPED
)
4702 /* Ignore (wildcard) resume requests for already-resumed
4704 if (r
->resume
[ndx
].kind
!= resume_stop
4705 && thread
->last_resume_kind
!= resume_stop
)
4708 debug_printf ("already %s LWP %ld at GDB's request\n",
4709 (thread
->last_resume_kind
4717 /* Don't let wildcard resumes resume fork children that GDB
4718 does not yet know are new fork children. */
4719 if (lwp
->fork_relative
!= NULL
)
4721 struct lwp_info
*rel
= lwp
->fork_relative
;
4723 if (rel
->status_pending_p
4724 && (rel
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
4725 || rel
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
))
4728 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4734 /* If the thread has a pending event that has already been
4735 reported to GDBserver core, but GDB has not pulled the
4736 event out of the vStopped queue yet, likewise, ignore the
4737 (wildcard) resume request. */
4738 if (in_queued_stop_replies (entry
->id
))
4741 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4746 lwp
->resume
= &r
->resume
[ndx
];
4747 thread
->last_resume_kind
= lwp
->resume
->kind
;
4749 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4750 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4752 /* If we had a deferred signal to report, dequeue one now.
4753 This can happen if LWP gets more than one signal while
4754 trying to get out of a jump pad. */
4756 && !lwp
->status_pending_p
4757 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4759 lwp
->status_pending_p
= 1;
4762 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4763 "leaving status pending.\n",
4764 WSTOPSIG (lwp
->status_pending
),
4772 /* No resume action for this thread. */
4778 /* find_inferior callback for linux_resume.
4779 Set *FLAG_P if this lwp has an interesting status pending. */
4782 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
4784 struct thread_info
*thread
= (struct thread_info
*) entry
;
4785 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4787 /* LWPs which will not be resumed are not interesting, because
4788 we might not wait for them next time through linux_wait. */
4789 if (lwp
->resume
== NULL
)
4792 if (thread_still_has_status_pending_p (thread
))
4793 * (int *) flag_p
= 1;
4798 /* Return 1 if this lwp that GDB wants running is stopped at an
4799 internal breakpoint that we need to step over. It assumes that any
4800 required STOP_PC adjustment has already been propagated to the
4801 inferior's regcache. */
4804 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
4806 struct thread_info
*thread
= (struct thread_info
*) entry
;
4807 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4808 struct thread_info
*saved_thread
;
4810 struct process_info
*proc
= get_thread_process (thread
);
4812 /* GDBserver is skipping the extra traps from the wrapper program,
4813 don't have to do step over. */
4814 if (proc
->tdesc
== NULL
)
4817 /* LWPs which will not be resumed are not interesting, because we
4818 might not wait for them next time through linux_wait. */
4823 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4828 if (thread
->last_resume_kind
== resume_stop
)
4831 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4837 gdb_assert (lwp
->suspended
>= 0);
4842 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4847 if (lwp
->status_pending_p
)
4850 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4856 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4860 /* If the PC has changed since we stopped, then don't do anything,
4861 and let the breakpoint/tracepoint be hit. This happens if, for
4862 instance, GDB handled the decr_pc_after_break subtraction itself,
4863 GDB is OOL stepping this thread, or the user has issued a "jump"
4864 command, or poked thread's registers herself. */
4865 if (pc
!= lwp
->stop_pc
)
4868 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4869 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4871 paddress (lwp
->stop_pc
), paddress (pc
));
4875 /* On software single step target, resume the inferior with signal
4876 rather than stepping over. */
4877 if (can_software_single_step ()
4878 && lwp
->pending_signals
!= NULL
4879 && lwp_signal_can_be_delivered (lwp
))
4882 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4889 saved_thread
= current_thread
;
4890 current_thread
= thread
;
4892 /* We can only step over breakpoints we know about. */
4893 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4895 /* Don't step over a breakpoint that GDB expects to hit
4896 though. If the condition is being evaluated on the target's side
4897 and it evaluate to false, step over this breakpoint as well. */
4898 if (gdb_breakpoint_here (pc
)
4899 && gdb_condition_true_at_breakpoint (pc
)
4900 && gdb_no_commands_at_breakpoint (pc
))
4903 debug_printf ("Need step over [LWP %ld]? yes, but found"
4904 " GDB breakpoint at 0x%s; skipping step over\n",
4905 lwpid_of (thread
), paddress (pc
));
4907 current_thread
= saved_thread
;
4913 debug_printf ("Need step over [LWP %ld]? yes, "
4914 "found breakpoint at 0x%s\n",
4915 lwpid_of (thread
), paddress (pc
));
4917 /* We've found an lwp that needs stepping over --- return 1 so
4918 that find_inferior stops looking. */
4919 current_thread
= saved_thread
;
4925 current_thread
= saved_thread
;
4928 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4930 lwpid_of (thread
), paddress (pc
));
4935 /* Start a step-over operation on LWP. When LWP stopped at a
4936 breakpoint, to make progress, we need to remove the breakpoint out
4937 of the way. If we let other threads run while we do that, they may
4938 pass by the breakpoint location and miss hitting it. To avoid
4939 that, a step-over momentarily stops all threads while LWP is
4940 single-stepped by either hardware or software while the breakpoint
4941 is temporarily uninserted from the inferior. When the single-step
4942 finishes, we reinsert the breakpoint, and let all threads that are
4943 supposed to be running, run again. */
4946 start_step_over (struct lwp_info
*lwp
)
4948 struct thread_info
*thread
= get_lwp_thread (lwp
);
4949 struct thread_info
*saved_thread
;
4954 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4957 stop_all_lwps (1, lwp
);
4959 if (lwp
->suspended
!= 0)
4961 internal_error (__FILE__
, __LINE__
,
4962 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4967 debug_printf ("Done stopping all threads for step-over.\n");
4969 /* Note, we should always reach here with an already adjusted PC,
4970 either by GDB (if we're resuming due to GDB's request), or by our
4971 caller, if we just finished handling an internal breakpoint GDB
4972 shouldn't care about. */
4975 saved_thread
= current_thread
;
4976 current_thread
= thread
;
4978 lwp
->bp_reinsert
= pc
;
4979 uninsert_breakpoints_at (pc
);
4980 uninsert_fast_tracepoint_jumps_at (pc
);
4982 step
= single_step (lwp
);
4984 current_thread
= saved_thread
;
4986 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4988 /* Require next event from this LWP. */
4989 step_over_bkpt
= thread
->entry
.id
;
4993 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4994 start_step_over, if still there, and delete any single-step
4995 breakpoints we've set, on non hardware single-step targets. */
4998 finish_step_over (struct lwp_info
*lwp
)
5000 if (lwp
->bp_reinsert
!= 0)
5002 struct thread_info
*saved_thread
= current_thread
;
5005 debug_printf ("Finished step over.\n");
5007 current_thread
= get_lwp_thread (lwp
);
5009 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
5010 may be no breakpoint to reinsert there by now. */
5011 reinsert_breakpoints_at (lwp
->bp_reinsert
);
5012 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
5014 lwp
->bp_reinsert
= 0;
5016 /* Delete any single-step breakpoints. No longer needed. We
5017 don't have to worry about other threads hitting this trap,
5018 and later not being able to explain it, because we were
5019 stepping over a breakpoint, and we hold all threads but
5020 LWP stopped while doing that. */
5021 if (!can_hardware_single_step ())
5023 gdb_assert (has_single_step_breakpoints (current_thread
));
5024 delete_single_step_breakpoints (current_thread
);
5027 step_over_bkpt
= null_ptid
;
5028 current_thread
= saved_thread
;
5035 /* If there's a step over in progress, wait until all threads stop
5036 (that is, until the stepping thread finishes its step), and
5037 unsuspend all lwps. The stepping thread ends with its status
5038 pending, which is processed later when we get back to processing
5042 complete_ongoing_step_over (void)
5044 if (!ptid_equal (step_over_bkpt
, null_ptid
))
5046 struct lwp_info
*lwp
;
5051 debug_printf ("detach: step over in progress, finish it first\n");
5053 /* Passing NULL_PTID as filter indicates we want all events to
5054 be left pending. Eventually this returns when there are no
5055 unwaited-for children left. */
5056 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
5058 gdb_assert (ret
== -1);
5060 lwp
= find_lwp_pid (step_over_bkpt
);
5062 finish_step_over (lwp
);
5063 step_over_bkpt
= null_ptid
;
5064 unsuspend_all_lwps (lwp
);
5068 /* This function is called once per thread. We check the thread's resume
5069 request, which will tell us whether to resume, step, or leave the thread
5070 stopped; and what signal, if any, it should be sent.
5072 For threads which we aren't explicitly told otherwise, we preserve
5073 the stepping flag; this is used for stepping over gdbserver-placed
5076 If pending_flags was set in any thread, we queue any needed
5077 signals, since we won't actually resume. We already have a pending
5078 event to report, so we don't need to preserve any step requests;
5079 they should be re-issued if necessary. */
5082 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
5084 struct thread_info
*thread
= (struct thread_info
*) entry
;
5085 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5086 int leave_all_stopped
= * (int *) arg
;
5089 if (lwp
->resume
== NULL
)
5092 if (lwp
->resume
->kind
== resume_stop
)
5095 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
5100 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
5102 /* Stop the thread, and wait for the event asynchronously,
5103 through the event loop. */
5109 debug_printf ("already stopped LWP %ld\n",
5112 /* The LWP may have been stopped in an internal event that
5113 was not meant to be notified back to GDB (e.g., gdbserver
5114 breakpoint), so we should be reporting a stop event in
5117 /* If the thread already has a pending SIGSTOP, this is a
5118 no-op. Otherwise, something later will presumably resume
5119 the thread and this will cause it to cancel any pending
5120 operation, due to last_resume_kind == resume_stop. If
5121 the thread already has a pending status to report, we
5122 will still report it the next time we wait - see
5123 status_pending_p_callback. */
5125 /* If we already have a pending signal to report, then
5126 there's no need to queue a SIGSTOP, as this means we're
5127 midway through moving the LWP out of the jumppad, and we
5128 will report the pending signal as soon as that is
5130 if (lwp
->pending_signals_to_report
== NULL
)
5134 /* For stop requests, we're done. */
5136 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5140 /* If this thread which is about to be resumed has a pending status,
5141 then don't resume it - we can just report the pending status.
5142 Likewise if it is suspended, because e.g., another thread is
5143 stepping past a breakpoint. Make sure to queue any signals that
5144 would otherwise be sent. In all-stop mode, we do this decision
5145 based on if *any* thread has a pending status. If there's a
5146 thread that needs the step-over-breakpoint dance, then don't
5147 resume any other thread but that particular one. */
5148 leave_pending
= (lwp
->suspended
5149 || lwp
->status_pending_p
5150 || leave_all_stopped
);
5152 /* If we have a new signal, enqueue the signal. */
5153 if (lwp
->resume
->sig
!= 0)
5155 siginfo_t info
, *info_p
;
5157 /* If this is the same signal we were previously stopped by,
5158 make sure to queue its siginfo. */
5159 if (WIFSTOPPED (lwp
->last_status
)
5160 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
5161 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
5162 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
5167 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
5173 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
5175 proceed_one_lwp (entry
, NULL
);
5180 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
5183 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5189 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5191 struct thread_resume_array array
= { resume_info
, n
};
5192 struct thread_info
*need_step_over
= NULL
;
5194 int leave_all_stopped
;
5199 debug_printf ("linux_resume:\n");
5202 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
5204 /* If there is a thread which would otherwise be resumed, which has
5205 a pending status, then don't resume any threads - we can just
5206 report the pending status. Make sure to queue any signals that
5207 would otherwise be sent. In non-stop mode, we'll apply this
5208 logic to each thread individually. We consume all pending events
5209 before considering to start a step-over (in all-stop). */
5212 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
5214 /* If there is a thread which would otherwise be resumed, which is
5215 stopped at a breakpoint that needs stepping over, then don't
5216 resume any threads - have it step over the breakpoint with all
5217 other threads stopped, then resume all threads again. Make sure
5218 to queue any signals that would otherwise be delivered or
5220 if (!any_pending
&& supports_breakpoints ())
5222 = (struct thread_info
*) find_inferior (&all_threads
,
5223 need_step_over_p
, NULL
);
5225 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5229 if (need_step_over
!= NULL
)
5230 debug_printf ("Not resuming all, need step over\n");
5231 else if (any_pending
)
5232 debug_printf ("Not resuming, all-stop and found "
5233 "an LWP with pending status\n");
5235 debug_printf ("Resuming, no pending status or step over needed\n");
5238 /* Even if we're leaving threads stopped, queue all signals we'd
5239 otherwise deliver. */
5240 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
5243 start_step_over (get_thread_lwp (need_step_over
));
5247 debug_printf ("linux_resume done\n");
5251 /* We may have events that were pending that can/should be sent to
5252 the client now. Trigger a linux_wait call. */
5253 if (target_is_async_p ())
5257 /* This function is called once per thread. We check the thread's
5258 last resume request, which will tell us whether to resume, step, or
5259 leave the thread stopped. Any signal the client requested to be
5260 delivered has already been enqueued at this point.
5262 If any thread that GDB wants running is stopped at an internal
5263 breakpoint that needs stepping over, we start a step-over operation
5264 on that particular thread, and leave all others stopped. */
5267 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
5269 struct thread_info
*thread
= (struct thread_info
*) entry
;
5270 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5277 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5282 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5286 if (thread
->last_resume_kind
== resume_stop
5287 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5290 debug_printf (" client wants LWP to remain %ld stopped\n",
5295 if (lwp
->status_pending_p
)
5298 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5303 gdb_assert (lwp
->suspended
>= 0);
5308 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5312 if (thread
->last_resume_kind
== resume_stop
5313 && lwp
->pending_signals_to_report
== NULL
5314 && (lwp
->collecting_fast_tracepoint
5315 == fast_tpoint_collect_result::not_collecting
))
5317 /* We haven't reported this LWP as stopped yet (otherwise, the
5318 last_status.kind check above would catch it, and we wouldn't
5319 reach here. This LWP may have been momentarily paused by a
5320 stop_all_lwps call while handling for example, another LWP's
5321 step-over. In that case, the pending expected SIGSTOP signal
5322 that was queued at vCont;t handling time will have already
5323 been consumed by wait_for_sigstop, and so we need to requeue
5324 another one here. Note that if the LWP already has a SIGSTOP
5325 pending, this is a no-op. */
5328 debug_printf ("Client wants LWP %ld to stop. "
5329 "Making sure it has a SIGSTOP pending\n",
5335 if (thread
->last_resume_kind
== resume_step
)
5338 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5341 /* If resume_step is requested by GDB, install single-step
5342 breakpoints when the thread is about to be actually resumed if
5343 the single-step breakpoints weren't removed. */
5344 if (can_software_single_step ()
5345 && !has_single_step_breakpoints (thread
))
5346 install_software_single_step_breakpoints (lwp
);
5348 step
= maybe_hw_step (thread
);
5350 else if (lwp
->bp_reinsert
!= 0)
5353 debug_printf (" stepping LWP %ld, reinsert set\n",
5356 step
= maybe_hw_step (thread
);
5361 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5366 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
5368 struct thread_info
*thread
= (struct thread_info
*) entry
;
5369 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5374 lwp_suspended_decr (lwp
);
5376 return proceed_one_lwp (entry
, except
);
5379 /* When we finish a step-over, set threads running again. If there's
5380 another thread that may need a step-over, now's the time to start
5381 it. Eventually, we'll move all threads past their breakpoints. */
5384 proceed_all_lwps (void)
5386 struct thread_info
*need_step_over
;
5388 /* If there is a thread which would otherwise be resumed, which is
5389 stopped at a breakpoint that needs stepping over, then don't
5390 resume any threads - have it step over the breakpoint with all
5391 other threads stopped, then resume all threads again. */
5393 if (supports_breakpoints ())
5396 = (struct thread_info
*) find_inferior (&all_threads
,
5397 need_step_over_p
, NULL
);
5399 if (need_step_over
!= NULL
)
5402 debug_printf ("proceed_all_lwps: found "
5403 "thread %ld needing a step-over\n",
5404 lwpid_of (need_step_over
));
5406 start_step_over (get_thread_lwp (need_step_over
));
5412 debug_printf ("Proceeding, no step-over needed\n");
5414 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
5417 /* Stopped LWPs that the client wanted to be running, that don't have
5418 pending statuses, are set to run again, except for EXCEPT, if not
5419 NULL. This undoes a stop_all_lwps call. */
5422 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5428 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5429 lwpid_of (get_lwp_thread (except
)));
5431 debug_printf ("unstopping all lwps\n");
5435 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
5437 find_inferior (&all_threads
, proceed_one_lwp
, except
);
5441 debug_printf ("unstop_all_lwps done\n");
5447 #ifdef HAVE_LINUX_REGSETS
5449 #define use_linux_regsets 1
5451 /* Returns true if REGSET has been disabled. */
5454 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5456 return (info
->disabled_regsets
!= NULL
5457 && info
->disabled_regsets
[regset
- info
->regsets
]);
5460 /* Disable REGSET. */
5463 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5467 dr_offset
= regset
- info
->regsets
;
5468 if (info
->disabled_regsets
== NULL
)
5469 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5470 info
->disabled_regsets
[dr_offset
] = 1;
5474 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5475 struct regcache
*regcache
)
5477 struct regset_info
*regset
;
5478 int saw_general_regs
= 0;
5482 pid
= lwpid_of (current_thread
);
5483 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5488 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5491 buf
= xmalloc (regset
->size
);
5493 nt_type
= regset
->nt_type
;
5497 iov
.iov_len
= regset
->size
;
5498 data
= (void *) &iov
;
5504 res
= ptrace (regset
->get_request
, pid
,
5505 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5507 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5513 /* If we get EIO on a regset, do not try it again for
5514 this process mode. */
5515 disable_regset (regsets_info
, regset
);
5517 else if (errno
== ENODATA
)
5519 /* ENODATA may be returned if the regset is currently
5520 not "active". This can happen in normal operation,
5521 so suppress the warning in this case. */
5523 else if (errno
== ESRCH
)
5525 /* At this point, ESRCH should mean the process is
5526 already gone, in which case we simply ignore attempts
5527 to read its registers. */
5532 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5539 if (regset
->type
== GENERAL_REGS
)
5540 saw_general_regs
= 1;
5541 regset
->store_function (regcache
, buf
);
5545 if (saw_general_regs
)
5552 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5553 struct regcache
*regcache
)
5555 struct regset_info
*regset
;
5556 int saw_general_regs
= 0;
5560 pid
= lwpid_of (current_thread
);
5561 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5566 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5567 || regset
->fill_function
== NULL
)
5570 buf
= xmalloc (regset
->size
);
5572 /* First fill the buffer with the current register set contents,
5573 in case there are any items in the kernel's regset that are
5574 not in gdbserver's regcache. */
5576 nt_type
= regset
->nt_type
;
5580 iov
.iov_len
= regset
->size
;
5581 data
= (void *) &iov
;
5587 res
= ptrace (regset
->get_request
, pid
,
5588 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5590 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5595 /* Then overlay our cached registers on that. */
5596 regset
->fill_function (regcache
, buf
);
5598 /* Only now do we write the register set. */
5600 res
= ptrace (regset
->set_request
, pid
,
5601 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5603 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5611 /* If we get EIO on a regset, do not try it again for
5612 this process mode. */
5613 disable_regset (regsets_info
, regset
);
5615 else if (errno
== ESRCH
)
5617 /* At this point, ESRCH should mean the process is
5618 already gone, in which case we simply ignore attempts
5619 to change its registers. See also the related
5620 comment in linux_resume_one_lwp. */
5626 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5629 else if (regset
->type
== GENERAL_REGS
)
5630 saw_general_regs
= 1;
5633 if (saw_general_regs
)
5639 #else /* !HAVE_LINUX_REGSETS */
5641 #define use_linux_regsets 0
5642 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5643 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5647 /* Return 1 if register REGNO is supported by one of the regset ptrace
5648 calls or 0 if it has to be transferred individually. */
5651 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5653 unsigned char mask
= 1 << (regno
% 8);
5654 size_t index
= regno
/ 8;
5656 return (use_linux_regsets
5657 && (regs_info
->regset_bitmap
== NULL
5658 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5661 #ifdef HAVE_LINUX_USRREGS
5664 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5668 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5669 error ("Invalid register number %d.", regnum
);
5671 addr
= usrregs
->regmap
[regnum
];
5676 /* Fetch one register. */
5678 fetch_register (const struct usrregs_info
*usrregs
,
5679 struct regcache
*regcache
, int regno
)
5686 if (regno
>= usrregs
->num_regs
)
5688 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5691 regaddr
= register_addr (usrregs
, regno
);
5695 size
= ((register_size (regcache
->tdesc
, regno
)
5696 + sizeof (PTRACE_XFER_TYPE
) - 1)
5697 & -sizeof (PTRACE_XFER_TYPE
));
5698 buf
= (char *) alloca (size
);
5700 pid
= lwpid_of (current_thread
);
5701 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5704 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5705 ptrace (PTRACE_PEEKUSER
, pid
,
5706 /* Coerce to a uintptr_t first to avoid potential gcc warning
5707 of coercing an 8 byte integer to a 4 byte pointer. */
5708 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5709 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5711 error ("reading register %d: %s", regno
, strerror (errno
));
5714 if (the_low_target
.supply_ptrace_register
)
5715 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5717 supply_register (regcache
, regno
, buf
);
5720 /* Store one register. */
5722 store_register (const struct usrregs_info
*usrregs
,
5723 struct regcache
*regcache
, int regno
)
5730 if (regno
>= usrregs
->num_regs
)
5732 if ((*the_low_target
.cannot_store_register
) (regno
))
5735 regaddr
= register_addr (usrregs
, regno
);
5739 size
= ((register_size (regcache
->tdesc
, regno
)
5740 + sizeof (PTRACE_XFER_TYPE
) - 1)
5741 & -sizeof (PTRACE_XFER_TYPE
));
5742 buf
= (char *) alloca (size
);
5743 memset (buf
, 0, size
);
5745 if (the_low_target
.collect_ptrace_register
)
5746 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5748 collect_register (regcache
, regno
, buf
);
5750 pid
= lwpid_of (current_thread
);
5751 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5754 ptrace (PTRACE_POKEUSER
, pid
,
5755 /* Coerce to a uintptr_t first to avoid potential gcc warning
5756 about coercing an 8 byte integer to a 4 byte pointer. */
5757 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5758 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5761 /* At this point, ESRCH should mean the process is
5762 already gone, in which case we simply ignore attempts
5763 to change its registers. See also the related
5764 comment in linux_resume_one_lwp. */
5768 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5769 error ("writing register %d: %s", regno
, strerror (errno
));
5771 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5775 /* Fetch all registers, or just one, from the child process.
5776 If REGNO is -1, do this for all registers, skipping any that are
5777 assumed to have been retrieved by regsets_fetch_inferior_registers,
5778 unless ALL is non-zero.
5779 Otherwise, REGNO specifies which register (so we can save time). */
5781 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5782 struct regcache
*regcache
, int regno
, int all
)
5784 struct usrregs_info
*usr
= regs_info
->usrregs
;
5788 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5789 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5790 fetch_register (usr
, regcache
, regno
);
5793 fetch_register (usr
, regcache
, regno
);
5796 /* Store our register values back into the inferior.
5797 If REGNO is -1, do this for all registers, skipping any that are
5798 assumed to have been saved by regsets_store_inferior_registers,
5799 unless ALL is non-zero.
5800 Otherwise, REGNO specifies which register (so we can save time). */
5802 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5803 struct regcache
*regcache
, int regno
, int all
)
5805 struct usrregs_info
*usr
= regs_info
->usrregs
;
5809 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5810 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5811 store_register (usr
, regcache
, regno
);
5814 store_register (usr
, regcache
, regno
);
5817 #else /* !HAVE_LINUX_USRREGS */
5819 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5820 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5826 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5830 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5834 if (the_low_target
.fetch_register
!= NULL
5835 && regs_info
->usrregs
!= NULL
)
5836 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5837 (*the_low_target
.fetch_register
) (regcache
, regno
);
5839 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5840 if (regs_info
->usrregs
!= NULL
)
5841 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5845 if (the_low_target
.fetch_register
!= NULL
5846 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5849 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5851 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5853 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5854 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5859 linux_store_registers (struct regcache
*regcache
, int regno
)
5863 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5867 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5869 if (regs_info
->usrregs
!= NULL
)
5870 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5874 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5876 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5878 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5879 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5884 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5885 to debugger memory starting at MYADDR. */
5888 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5890 int pid
= lwpid_of (current_thread
);
5891 PTRACE_XFER_TYPE
*buffer
;
5899 /* Try using /proc. Don't bother for one word. */
5900 if (len
>= 3 * sizeof (long))
5904 /* We could keep this file open and cache it - possibly one per
5905 thread. That requires some juggling, but is even faster. */
5906 sprintf (filename
, "/proc/%d/mem", pid
);
5907 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5911 /* If pread64 is available, use it. It's faster if the kernel
5912 supports it (only one syscall), and it's 64-bit safe even on
5913 32-bit platforms (for instance, SPARC debugging a SPARC64
5916 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5919 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5920 bytes
= read (fd
, myaddr
, len
);
5927 /* Some data was read, we'll try to get the rest with ptrace. */
5937 /* Round starting address down to longword boundary. */
5938 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5939 /* Round ending address up; get number of longwords that makes. */
5940 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5941 / sizeof (PTRACE_XFER_TYPE
));
5942 /* Allocate buffer of that many longwords. */
5943 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5945 /* Read all the longwords */
5947 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5949 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5950 about coercing an 8 byte integer to a 4 byte pointer. */
5951 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5952 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5953 (PTRACE_TYPE_ARG4
) 0);
5959 /* Copy appropriate bytes out of the buffer. */
5962 i
*= sizeof (PTRACE_XFER_TYPE
);
5963 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5965 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5972 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5973 memory at MEMADDR. On failure (cannot write to the inferior)
5974 returns the value of errno. Always succeeds if LEN is zero. */
5977 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5980 /* Round starting address down to longword boundary. */
5981 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5982 /* Round ending address up; get number of longwords that makes. */
5984 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5985 / sizeof (PTRACE_XFER_TYPE
);
5987 /* Allocate buffer of that many longwords. */
5988 PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5990 int pid
= lwpid_of (current_thread
);
5994 /* Zero length write always succeeds. */
6000 /* Dump up to four bytes. */
6001 char str
[4 * 2 + 1];
6003 int dump
= len
< 4 ? len
: 4;
6005 for (i
= 0; i
< dump
; i
++)
6007 sprintf (p
, "%02x", myaddr
[i
]);
6012 debug_printf ("Writing %s to 0x%08lx in process %d\n",
6013 str
, (long) memaddr
, pid
);
6016 /* Fill start and end extra bytes of buffer with existing memory data. */
6019 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
6020 about coercing an 8 byte integer to a 4 byte pointer. */
6021 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
6022 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
6023 (PTRACE_TYPE_ARG4
) 0);
6031 = ptrace (PTRACE_PEEKTEXT
, pid
,
6032 /* Coerce to a uintptr_t first to avoid potential gcc warning
6033 about coercing an 8 byte integer to a 4 byte pointer. */
6034 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
6035 * sizeof (PTRACE_XFER_TYPE
)),
6036 (PTRACE_TYPE_ARG4
) 0);
6041 /* Copy data to be written over corresponding part of buffer. */
6043 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
6046 /* Write the entire buffer. */
6048 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
6051 ptrace (PTRACE_POKETEXT
, pid
,
6052 /* Coerce to a uintptr_t first to avoid potential gcc warning
6053 about coercing an 8 byte integer to a 4 byte pointer. */
6054 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
6055 (PTRACE_TYPE_ARG4
) buffer
[i
]);
6064 linux_look_up_symbols (void)
6066 #ifdef USE_THREAD_DB
6067 struct process_info
*proc
= current_process ();
6069 if (proc
->priv
->thread_db
!= NULL
)
6077 linux_request_interrupt (void)
6079 /* Send a SIGINT to the process group. This acts just like the user
6080 typed a ^C on the controlling terminal. */
6081 kill (-signal_pid
, SIGINT
);
6084 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
6085 to debugger memory starting at MYADDR. */
6088 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
6090 char filename
[PATH_MAX
];
6092 int pid
= lwpid_of (current_thread
);
6094 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6096 fd
= open (filename
, O_RDONLY
);
6100 if (offset
!= (CORE_ADDR
) 0
6101 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6104 n
= read (fd
, myaddr
, len
);
6111 /* These breakpoint and watchpoint related wrapper functions simply
6112 pass on the function call if the target has registered a
6113 corresponding function. */
6116 linux_supports_z_point_type (char z_type
)
6118 return (the_low_target
.supports_z_point_type
!= NULL
6119 && the_low_target
.supports_z_point_type (z_type
));
6123 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6124 int size
, struct raw_breakpoint
*bp
)
6126 if (type
== raw_bkpt_type_sw
)
6127 return insert_memory_breakpoint (bp
);
6128 else if (the_low_target
.insert_point
!= NULL
)
6129 return the_low_target
.insert_point (type
, addr
, size
, bp
);
6131 /* Unsupported (see target.h). */
6136 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
6137 int size
, struct raw_breakpoint
*bp
)
6139 if (type
== raw_bkpt_type_sw
)
6140 return remove_memory_breakpoint (bp
);
6141 else if (the_low_target
.remove_point
!= NULL
)
6142 return the_low_target
.remove_point (type
, addr
, size
, bp
);
6144 /* Unsupported (see target.h). */
6148 /* Implement the to_stopped_by_sw_breakpoint target_ops
6152 linux_stopped_by_sw_breakpoint (void)
6154 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6156 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
6159 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
6163 linux_supports_stopped_by_sw_breakpoint (void)
6165 return USE_SIGTRAP_SIGINFO
;
6168 /* Implement the to_stopped_by_hw_breakpoint target_ops
6172 linux_stopped_by_hw_breakpoint (void)
6174 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6176 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
6179 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6183 linux_supports_stopped_by_hw_breakpoint (void)
6185 return USE_SIGTRAP_SIGINFO
;
6188 /* Implement the supports_hardware_single_step target_ops method. */
6191 linux_supports_hardware_single_step (void)
6193 return can_hardware_single_step ();
6197 linux_supports_software_single_step (void)
6199 return can_software_single_step ();
6203 linux_stopped_by_watchpoint (void)
6205 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6207 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6211 linux_stopped_data_address (void)
6213 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6215 return lwp
->stopped_data_address
;
6218 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6219 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6220 && defined(PT_TEXT_END_ADDR)
6222 /* This is only used for targets that define PT_TEXT_ADDR,
6223 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6224 the target has different ways of acquiring this information, like
6227 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6228 to tell gdb about. */
6231 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6233 unsigned long text
, text_end
, data
;
6234 int pid
= lwpid_of (current_thread
);
6238 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6239 (PTRACE_TYPE_ARG4
) 0);
6240 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6241 (PTRACE_TYPE_ARG4
) 0);
6242 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6243 (PTRACE_TYPE_ARG4
) 0);
6247 /* Both text and data offsets produced at compile-time (and so
6248 used by gdb) are relative to the beginning of the program,
6249 with the data segment immediately following the text segment.
6250 However, the actual runtime layout in memory may put the data
6251 somewhere else, so when we send gdb a data base-address, we
6252 use the real data base address and subtract the compile-time
6253 data base-address from it (which is just the length of the
6254 text segment). BSS immediately follows data in both
6257 *data_p
= data
- (text_end
- text
);
6266 linux_qxfer_osdata (const char *annex
,
6267 unsigned char *readbuf
, unsigned const char *writebuf
,
6268 CORE_ADDR offset
, int len
)
6270 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6273 /* Convert a native/host siginfo object, into/from the siginfo in the
6274 layout of the inferiors' architecture. */
6277 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6281 if (the_low_target
.siginfo_fixup
!= NULL
)
6282 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6284 /* If there was no callback, or the callback didn't do anything,
6285 then just do a straight memcpy. */
6289 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6291 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6296 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6297 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6301 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6303 if (current_thread
== NULL
)
6306 pid
= lwpid_of (current_thread
);
6309 debug_printf ("%s siginfo for lwp %d.\n",
6310 readbuf
!= NULL
? "Reading" : "Writing",
6313 if (offset
>= sizeof (siginfo
))
6316 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6319 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6320 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6321 inferior with a 64-bit GDBSERVER should look the same as debugging it
6322 with a 32-bit GDBSERVER, we need to convert it. */
6323 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6325 if (offset
+ len
> sizeof (siginfo
))
6326 len
= sizeof (siginfo
) - offset
;
6328 if (readbuf
!= NULL
)
6329 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6332 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6334 /* Convert back to ptrace layout before flushing it out. */
6335 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6337 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6344 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6345 so we notice when children change state; as the handler for the
6346 sigsuspend in my_waitpid. */
6349 sigchld_handler (int signo
)
6351 int old_errno
= errno
;
6357 /* fprintf is not async-signal-safe, so call write
6359 if (write (2, "sigchld_handler\n",
6360 sizeof ("sigchld_handler\n") - 1) < 0)
6361 break; /* just ignore */
6365 if (target_is_async_p ())
6366 async_file_mark (); /* trigger a linux_wait */
6372 linux_supports_non_stop (void)
6378 linux_async (int enable
)
6380 int previous
= target_is_async_p ();
6383 debug_printf ("linux_async (%d), previous=%d\n",
6386 if (previous
!= enable
)
6389 sigemptyset (&mask
);
6390 sigaddset (&mask
, SIGCHLD
);
6392 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6396 if (pipe (linux_event_pipe
) == -1)
6398 linux_event_pipe
[0] = -1;
6399 linux_event_pipe
[1] = -1;
6400 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6402 warning ("creating event pipe failed.");
6406 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6407 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6409 /* Register the event loop handler. */
6410 add_file_handler (linux_event_pipe
[0],
6411 handle_target_event
, NULL
);
6413 /* Always trigger a linux_wait. */
6418 delete_file_handler (linux_event_pipe
[0]);
6420 close (linux_event_pipe
[0]);
6421 close (linux_event_pipe
[1]);
6422 linux_event_pipe
[0] = -1;
6423 linux_event_pipe
[1] = -1;
6426 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6433 linux_start_non_stop (int nonstop
)
6435 /* Register or unregister from event-loop accordingly. */
6436 linux_async (nonstop
);
6438 if (target_is_async_p () != (nonstop
!= 0))
6445 linux_supports_multi_process (void)
6450 /* Check if fork events are supported. */
6453 linux_supports_fork_events (void)
6455 return linux_supports_tracefork ();
6458 /* Check if vfork events are supported. */
6461 linux_supports_vfork_events (void)
6463 return linux_supports_tracefork ();
6466 /* Check if exec events are supported. */
6469 linux_supports_exec_events (void)
6471 return linux_supports_traceexec ();
6474 /* Callback for 'find_inferior'. Set the (possibly changed) ptrace
6475 options for the specified lwp. */
6478 reset_lwp_ptrace_options_callback (struct inferior_list_entry
*entry
,
6481 struct thread_info
*thread
= (struct thread_info
*) entry
;
6482 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6486 /* Stop the lwp so we can modify its ptrace options. */
6487 lwp
->must_set_ptrace_flags
= 1;
6488 linux_stop_lwp (lwp
);
6492 /* Already stopped; go ahead and set the ptrace options. */
6493 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6494 int options
= linux_low_ptrace_options (proc
->attached
);
6496 linux_enable_event_reporting (lwpid_of (thread
), options
);
6497 lwp
->must_set_ptrace_flags
= 0;
6503 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6504 ptrace flags for all inferiors. This is in case the new GDB connection
6505 doesn't support the same set of events that the previous one did. */
6508 linux_handle_new_gdb_connection (void)
6512 /* Request that all the lwps reset their ptrace options. */
6513 find_inferior (&all_threads
, reset_lwp_ptrace_options_callback
, &pid
);
6517 linux_supports_disable_randomization (void)
6519 #ifdef HAVE_PERSONALITY
6527 linux_supports_agent (void)
6533 linux_supports_range_stepping (void)
6535 if (can_software_single_step ())
6537 if (*the_low_target
.supports_range_stepping
== NULL
)
6540 return (*the_low_target
.supports_range_stepping
) ();
6543 /* Enumerate spufs IDs for process PID. */
6545 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6551 struct dirent
*entry
;
6553 sprintf (path
, "/proc/%ld/fd", pid
);
6554 dir
= opendir (path
);
6559 while ((entry
= readdir (dir
)) != NULL
)
6565 fd
= atoi (entry
->d_name
);
6569 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6570 if (stat (path
, &st
) != 0)
6572 if (!S_ISDIR (st
.st_mode
))
6575 if (statfs (path
, &stfs
) != 0)
6577 if (stfs
.f_type
!= SPUFS_MAGIC
)
6580 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6582 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6592 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6593 object type, using the /proc file system. */
6595 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6596 unsigned const char *writebuf
,
6597 CORE_ADDR offset
, int len
)
6599 long pid
= lwpid_of (current_thread
);
6604 if (!writebuf
&& !readbuf
)
6612 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6615 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6616 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6621 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6628 ret
= write (fd
, writebuf
, (size_t) len
);
6630 ret
= read (fd
, readbuf
, (size_t) len
);
6636 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6637 struct target_loadseg
6639 /* Core address to which the segment is mapped. */
6641 /* VMA recorded in the program header. */
6643 /* Size of this segment in memory. */
6647 # if defined PT_GETDSBT
6648 struct target_loadmap
6650 /* Protocol version number, must be zero. */
6652 /* Pointer to the DSBT table, its size, and the DSBT index. */
6653 unsigned *dsbt_table
;
6654 unsigned dsbt_size
, dsbt_index
;
6655 /* Number of segments in this map. */
6657 /* The actual memory map. */
6658 struct target_loadseg segs
[/*nsegs*/];
6660 # define LINUX_LOADMAP PT_GETDSBT
6661 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6662 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6664 struct target_loadmap
6666 /* Protocol version number, must be zero. */
6668 /* Number of segments in this map. */
6670 /* The actual memory map. */
6671 struct target_loadseg segs
[/*nsegs*/];
6673 # define LINUX_LOADMAP PTRACE_GETFDPIC
6674 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6675 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6679 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6680 unsigned char *myaddr
, unsigned int len
)
6682 int pid
= lwpid_of (current_thread
);
6684 struct target_loadmap
*data
= NULL
;
6685 unsigned int actual_length
, copy_length
;
6687 if (strcmp (annex
, "exec") == 0)
6688 addr
= (int) LINUX_LOADMAP_EXEC
;
6689 else if (strcmp (annex
, "interp") == 0)
6690 addr
= (int) LINUX_LOADMAP_INTERP
;
6694 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6700 actual_length
= sizeof (struct target_loadmap
)
6701 + sizeof (struct target_loadseg
) * data
->nsegs
;
6703 if (offset
< 0 || offset
> actual_length
)
6706 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6707 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6711 # define linux_read_loadmap NULL
6712 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6715 linux_process_qsupported (char **features
, int count
)
6717 if (the_low_target
.process_qsupported
!= NULL
)
6718 the_low_target
.process_qsupported (features
, count
);
6722 linux_supports_catch_syscall (void)
6724 return (the_low_target
.get_syscall_trapinfo
!= NULL
6725 && linux_supports_tracesysgood ());
6729 linux_get_ipa_tdesc_idx (void)
6731 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6734 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6738 linux_supports_tracepoints (void)
6740 if (*the_low_target
.supports_tracepoints
== NULL
)
6743 return (*the_low_target
.supports_tracepoints
) ();
6747 linux_read_pc (struct regcache
*regcache
)
6749 if (the_low_target
.get_pc
== NULL
)
6752 return (*the_low_target
.get_pc
) (regcache
);
6756 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6758 gdb_assert (the_low_target
.set_pc
!= NULL
);
6760 (*the_low_target
.set_pc
) (regcache
, pc
);
6764 linux_thread_stopped (struct thread_info
*thread
)
6766 return get_thread_lwp (thread
)->stopped
;
6769 /* This exposes stop-all-threads functionality to other modules. */
6772 linux_pause_all (int freeze
)
6774 stop_all_lwps (freeze
, NULL
);
6777 /* This exposes unstop-all-threads functionality to other gdbserver
6781 linux_unpause_all (int unfreeze
)
6783 unstop_all_lwps (unfreeze
, NULL
);
6787 linux_prepare_to_access_memory (void)
6789 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6792 linux_pause_all (1);
6797 linux_done_accessing_memory (void)
6799 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6802 linux_unpause_all (1);
6806 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6807 CORE_ADDR collector
,
6810 CORE_ADDR
*jump_entry
,
6811 CORE_ADDR
*trampoline
,
6812 ULONGEST
*trampoline_size
,
6813 unsigned char *jjump_pad_insn
,
6814 ULONGEST
*jjump_pad_insn_size
,
6815 CORE_ADDR
*adjusted_insn_addr
,
6816 CORE_ADDR
*adjusted_insn_addr_end
,
6819 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6820 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6821 jump_entry
, trampoline
, trampoline_size
,
6822 jjump_pad_insn
, jjump_pad_insn_size
,
6823 adjusted_insn_addr
, adjusted_insn_addr_end
,
6827 static struct emit_ops
*
6828 linux_emit_ops (void)
6830 if (the_low_target
.emit_ops
!= NULL
)
6831 return (*the_low_target
.emit_ops
) ();
6837 linux_get_min_fast_tracepoint_insn_len (void)
6839 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6842 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6845 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6846 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6848 char filename
[PATH_MAX
];
6850 const int auxv_size
= is_elf64
6851 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6852 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6854 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6856 fd
= open (filename
, O_RDONLY
);
6862 while (read (fd
, buf
, auxv_size
) == auxv_size
6863 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6867 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6869 switch (aux
->a_type
)
6872 *phdr_memaddr
= aux
->a_un
.a_val
;
6875 *num_phdr
= aux
->a_un
.a_val
;
6881 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6883 switch (aux
->a_type
)
6886 *phdr_memaddr
= aux
->a_un
.a_val
;
6889 *num_phdr
= aux
->a_un
.a_val
;
6897 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6899 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6900 "phdr_memaddr = %ld, phdr_num = %d",
6901 (long) *phdr_memaddr
, *num_phdr
);
6908 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6911 get_dynamic (const int pid
, const int is_elf64
)
6913 CORE_ADDR phdr_memaddr
, relocation
;
6915 unsigned char *phdr_buf
;
6916 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6918 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6921 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6922 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6924 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6927 /* Compute relocation: it is expected to be 0 for "regular" executables,
6928 non-zero for PIE ones. */
6930 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6933 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6935 if (p
->p_type
== PT_PHDR
)
6936 relocation
= phdr_memaddr
- p
->p_vaddr
;
6940 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6942 if (p
->p_type
== PT_PHDR
)
6943 relocation
= phdr_memaddr
- p
->p_vaddr
;
6946 if (relocation
== -1)
6948 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6949 any real world executables, including PIE executables, have always
6950 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6951 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6952 or present DT_DEBUG anyway (fpc binaries are statically linked).
6954 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6956 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6961 for (i
= 0; i
< num_phdr
; i
++)
6965 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6967 if (p
->p_type
== PT_DYNAMIC
)
6968 return p
->p_vaddr
+ relocation
;
6972 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6974 if (p
->p_type
== PT_DYNAMIC
)
6975 return p
->p_vaddr
+ relocation
;
6982 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6983 can be 0 if the inferior does not yet have the library list initialized.
6984 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6985 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6988 get_r_debug (const int pid
, const int is_elf64
)
6990 CORE_ADDR dynamic_memaddr
;
6991 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6992 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6995 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6996 if (dynamic_memaddr
== 0)
6999 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
7003 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
7004 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
7008 unsigned char buf
[sizeof (Elf64_Xword
)];
7012 #ifdef DT_MIPS_RLD_MAP
7013 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
7015 if (linux_read_memory (dyn
->d_un
.d_val
,
7016 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7021 #endif /* DT_MIPS_RLD_MAP */
7022 #ifdef DT_MIPS_RLD_MAP_REL
7023 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
7025 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
7026 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7031 #endif /* DT_MIPS_RLD_MAP_REL */
7033 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
7034 map
= dyn
->d_un
.d_val
;
7036 if (dyn
->d_tag
== DT_NULL
)
7041 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
7042 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
7046 unsigned char buf
[sizeof (Elf32_Word
)];
7050 #ifdef DT_MIPS_RLD_MAP
7051 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
7053 if (linux_read_memory (dyn
->d_un
.d_val
,
7054 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7059 #endif /* DT_MIPS_RLD_MAP */
7060 #ifdef DT_MIPS_RLD_MAP_REL
7061 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
7063 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
7064 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
7069 #endif /* DT_MIPS_RLD_MAP_REL */
7071 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
7072 map
= dyn
->d_un
.d_val
;
7074 if (dyn
->d_tag
== DT_NULL
)
7078 dynamic_memaddr
+= dyn_size
;
7084 /* Read one pointer from MEMADDR in the inferior. */
7087 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
7091 /* Go through a union so this works on either big or little endian
7092 hosts, when the inferior's pointer size is smaller than the size
7093 of CORE_ADDR. It is assumed the inferior's endianness is the
7094 same of the superior's. */
7097 CORE_ADDR core_addr
;
7102 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
7105 if (ptr_size
== sizeof (CORE_ADDR
))
7106 *ptr
= addr
.core_addr
;
7107 else if (ptr_size
== sizeof (unsigned int))
7110 gdb_assert_not_reached ("unhandled pointer size");
7115 struct link_map_offsets
7117 /* Offset and size of r_debug.r_version. */
7118 int r_version_offset
;
7120 /* Offset and size of r_debug.r_map. */
7123 /* Offset to l_addr field in struct link_map. */
7126 /* Offset to l_name field in struct link_map. */
7129 /* Offset to l_ld field in struct link_map. */
7132 /* Offset to l_next field in struct link_map. */
7135 /* Offset to l_prev field in struct link_map. */
7139 /* Construct qXfer:libraries-svr4:read reply. */
7142 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
7143 unsigned const char *writebuf
,
7144 CORE_ADDR offset
, int len
)
7147 unsigned document_len
;
7148 struct process_info_private
*const priv
= current_process ()->priv
;
7149 char filename
[PATH_MAX
];
7152 static const struct link_map_offsets lmo_32bit_offsets
=
7154 0, /* r_version offset. */
7155 4, /* r_debug.r_map offset. */
7156 0, /* l_addr offset in link_map. */
7157 4, /* l_name offset in link_map. */
7158 8, /* l_ld offset in link_map. */
7159 12, /* l_next offset in link_map. */
7160 16 /* l_prev offset in link_map. */
7163 static const struct link_map_offsets lmo_64bit_offsets
=
7165 0, /* r_version offset. */
7166 8, /* r_debug.r_map offset. */
7167 0, /* l_addr offset in link_map. */
7168 8, /* l_name offset in link_map. */
7169 16, /* l_ld offset in link_map. */
7170 24, /* l_next offset in link_map. */
7171 32 /* l_prev offset in link_map. */
7173 const struct link_map_offsets
*lmo
;
7174 unsigned int machine
;
7176 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
7177 int allocated
= 1024;
7179 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
7180 int header_done
= 0;
7182 if (writebuf
!= NULL
)
7184 if (readbuf
== NULL
)
7187 pid
= lwpid_of (current_thread
);
7188 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7189 is_elf64
= elf_64_file_p (filename
, &machine
);
7190 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7191 ptr_size
= is_elf64
? 8 : 4;
7193 while (annex
[0] != '\0')
7199 sep
= strchr (annex
, '=');
7204 if (len
== 5 && startswith (annex
, "start"))
7206 else if (len
== 4 && startswith (annex
, "prev"))
7210 annex
= strchr (sep
, ';');
7217 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7224 if (priv
->r_debug
== 0)
7225 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7227 /* We failed to find DT_DEBUG. Such situation will not change
7228 for this inferior - do not retry it. Report it to GDB as
7229 E01, see for the reasons at the GDB solib-svr4.c side. */
7230 if (priv
->r_debug
== (CORE_ADDR
) -1)
7233 if (priv
->r_debug
!= 0)
7235 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7236 (unsigned char *) &r_version
,
7237 sizeof (r_version
)) != 0
7240 warning ("unexpected r_debug version %d", r_version
);
7242 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7243 &lm_addr
, ptr_size
) != 0)
7245 warning ("unable to read r_map from 0x%lx",
7246 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7251 document
= (char *) xmalloc (allocated
);
7252 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7253 p
= document
+ strlen (document
);
7256 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7257 &l_name
, ptr_size
) == 0
7258 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7259 &l_addr
, ptr_size
) == 0
7260 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7261 &l_ld
, ptr_size
) == 0
7262 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7263 &l_prev
, ptr_size
) == 0
7264 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7265 &l_next
, ptr_size
) == 0)
7267 unsigned char libname
[PATH_MAX
];
7269 if (lm_prev
!= l_prev
)
7271 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7272 (long) lm_prev
, (long) l_prev
);
7276 /* Ignore the first entry even if it has valid name as the first entry
7277 corresponds to the main executable. The first entry should not be
7278 skipped if the dynamic loader was loaded late by a static executable
7279 (see solib-svr4.c parameter ignore_first). But in such case the main
7280 executable does not have PT_DYNAMIC present and this function already
7281 exited above due to failed get_r_debug. */
7284 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7289 /* Not checking for error because reading may stop before
7290 we've got PATH_MAX worth of characters. */
7292 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7293 libname
[sizeof (libname
) - 1] = '\0';
7294 if (libname
[0] != '\0')
7296 /* 6x the size for xml_escape_text below. */
7297 size_t len
= 6 * strlen ((char *) libname
);
7301 /* Terminate `<library-list-svr4'. */
7306 while (allocated
< p
- document
+ len
+ 200)
7308 /* Expand to guarantee sufficient storage. */
7309 uintptr_t document_len
= p
- document
;
7311 document
= (char *) xrealloc (document
, 2 * allocated
);
7313 p
= document
+ document_len
;
7316 std::string name
= xml_escape_text ((char *) libname
);
7317 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7318 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7319 name
.c_str (), (unsigned long) lm_addr
,
7320 (unsigned long) l_addr
, (unsigned long) l_ld
);
7330 /* Empty list; terminate `<library-list-svr4'. */
7334 strcpy (p
, "</library-list-svr4>");
7336 document_len
= strlen (document
);
7337 if (offset
< document_len
)
7338 document_len
-= offset
;
7341 if (len
> document_len
)
7344 memcpy (readbuf
, document
+ offset
, len
);
7350 #ifdef HAVE_LINUX_BTRACE
7352 /* See to_disable_btrace target method. */
7355 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7357 enum btrace_error err
;
7359 err
= linux_disable_btrace (tinfo
);
7360 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7363 /* Encode an Intel Processor Trace configuration. */
7366 linux_low_encode_pt_config (struct buffer
*buffer
,
7367 const struct btrace_data_pt_config
*config
)
7369 buffer_grow_str (buffer
, "<pt-config>\n");
7371 switch (config
->cpu
.vendor
)
7374 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7375 "model=\"%u\" stepping=\"%u\"/>\n",
7376 config
->cpu
.family
, config
->cpu
.model
,
7377 config
->cpu
.stepping
);
7384 buffer_grow_str (buffer
, "</pt-config>\n");
7387 /* Encode a raw buffer. */
7390 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7396 /* We use hex encoding - see common/rsp-low.h. */
7397 buffer_grow_str (buffer
, "<raw>\n");
7403 elem
[0] = tohex ((*data
>> 4) & 0xf);
7404 elem
[1] = tohex (*data
++ & 0xf);
7406 buffer_grow (buffer
, elem
, 2);
7409 buffer_grow_str (buffer
, "</raw>\n");
7412 /* See to_read_btrace target method. */
7415 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7416 enum btrace_read_type type
)
7418 struct btrace_data btrace
;
7419 struct btrace_block
*block
;
7420 enum btrace_error err
;
7423 btrace_data_init (&btrace
);
7425 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7426 if (err
!= BTRACE_ERR_NONE
)
7428 if (err
== BTRACE_ERR_OVERFLOW
)
7429 buffer_grow_str0 (buffer
, "E.Overflow.");
7431 buffer_grow_str0 (buffer
, "E.Generic Error.");
7436 switch (btrace
.format
)
7438 case BTRACE_FORMAT_NONE
:
7439 buffer_grow_str0 (buffer
, "E.No Trace.");
7442 case BTRACE_FORMAT_BTS
:
7443 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7444 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7447 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7449 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7450 paddress (block
->begin
), paddress (block
->end
));
7452 buffer_grow_str0 (buffer
, "</btrace>\n");
7455 case BTRACE_FORMAT_PT
:
7456 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7457 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7458 buffer_grow_str (buffer
, "<pt>\n");
7460 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7462 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7463 btrace
.variant
.pt
.size
);
7465 buffer_grow_str (buffer
, "</pt>\n");
7466 buffer_grow_str0 (buffer
, "</btrace>\n");
7470 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7474 btrace_data_fini (&btrace
);
7478 btrace_data_fini (&btrace
);
7482 /* See to_btrace_conf target method. */
7485 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7486 struct buffer
*buffer
)
7488 const struct btrace_config
*conf
;
7490 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7491 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7493 conf
= linux_btrace_conf (tinfo
);
7496 switch (conf
->format
)
7498 case BTRACE_FORMAT_NONE
:
7501 case BTRACE_FORMAT_BTS
:
7502 buffer_xml_printf (buffer
, "<bts");
7503 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7504 buffer_xml_printf (buffer
, " />\n");
7507 case BTRACE_FORMAT_PT
:
7508 buffer_xml_printf (buffer
, "<pt");
7509 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7510 buffer_xml_printf (buffer
, "/>\n");
7515 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7518 #endif /* HAVE_LINUX_BTRACE */
7520 /* See nat/linux-nat.h. */
7523 current_lwp_ptid (void)
7525 return ptid_of (current_thread
);
7528 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7531 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7533 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7534 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7536 return default_breakpoint_kind_from_pc (pcptr
);
7539 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7541 static const gdb_byte
*
7542 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7544 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7546 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7549 /* Implementation of the target_ops method
7550 "breakpoint_kind_from_current_state". */
7553 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7555 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7556 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7558 return linux_breakpoint_kind_from_pc (pcptr
);
7561 /* Default implementation of linux_target_ops method "set_pc" for
7562 32-bit pc register which is literally named "pc". */
7565 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7567 uint32_t newpc
= pc
;
7569 supply_register_by_name (regcache
, "pc", &newpc
);
7572 /* Default implementation of linux_target_ops method "get_pc" for
7573 32-bit pc register which is literally named "pc". */
7576 linux_get_pc_32bit (struct regcache
*regcache
)
7580 collect_register_by_name (regcache
, "pc", &pc
);
7582 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7586 /* Default implementation of linux_target_ops method "set_pc" for
7587 64-bit pc register which is literally named "pc". */
7590 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7592 uint64_t newpc
= pc
;
7594 supply_register_by_name (regcache
, "pc", &newpc
);
7597 /* Default implementation of linux_target_ops method "get_pc" for
7598 64-bit pc register which is literally named "pc". */
7601 linux_get_pc_64bit (struct regcache
*regcache
)
7605 collect_register_by_name (regcache
, "pc", &pc
);
7607 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7612 static struct target_ops linux_target_ops
= {
7613 linux_create_inferior
,
7614 linux_post_create_inferior
,
7623 linux_fetch_registers
,
7624 linux_store_registers
,
7625 linux_prepare_to_access_memory
,
7626 linux_done_accessing_memory
,
7629 linux_look_up_symbols
,
7630 linux_request_interrupt
,
7632 linux_supports_z_point_type
,
7635 linux_stopped_by_sw_breakpoint
,
7636 linux_supports_stopped_by_sw_breakpoint
,
7637 linux_stopped_by_hw_breakpoint
,
7638 linux_supports_stopped_by_hw_breakpoint
,
7639 linux_supports_hardware_single_step
,
7640 linux_stopped_by_watchpoint
,
7641 linux_stopped_data_address
,
7642 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7643 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7644 && defined(PT_TEXT_END_ADDR)
7649 #ifdef USE_THREAD_DB
7650 thread_db_get_tls_address
,
7655 hostio_last_error_from_errno
,
7658 linux_supports_non_stop
,
7660 linux_start_non_stop
,
7661 linux_supports_multi_process
,
7662 linux_supports_fork_events
,
7663 linux_supports_vfork_events
,
7664 linux_supports_exec_events
,
7665 linux_handle_new_gdb_connection
,
7666 #ifdef USE_THREAD_DB
7667 thread_db_handle_monitor_command
,
7671 linux_common_core_of_thread
,
7673 linux_process_qsupported
,
7674 linux_supports_tracepoints
,
7677 linux_thread_stopped
,
7681 linux_stabilize_threads
,
7682 linux_install_fast_tracepoint_jump_pad
,
7684 linux_supports_disable_randomization
,
7685 linux_get_min_fast_tracepoint_insn_len
,
7686 linux_qxfer_libraries_svr4
,
7687 linux_supports_agent
,
7688 #ifdef HAVE_LINUX_BTRACE
7689 linux_supports_btrace
,
7690 linux_enable_btrace
,
7691 linux_low_disable_btrace
,
7692 linux_low_read_btrace
,
7693 linux_low_btrace_conf
,
7701 linux_supports_range_stepping
,
7702 linux_proc_pid_to_exec_file
,
7703 linux_mntns_open_cloexec
,
7705 linux_mntns_readlink
,
7706 linux_breakpoint_kind_from_pc
,
7707 linux_sw_breakpoint_from_kind
,
7708 linux_proc_tid_get_name
,
7709 linux_breakpoint_kind_from_current_state
,
7710 linux_supports_software_single_step
,
7711 linux_supports_catch_syscall
,
7712 linux_get_ipa_tdesc_idx
,
7714 thread_db_thread_handle
,
7720 #ifdef HAVE_LINUX_REGSETS
7722 initialize_regsets_info (struct regsets_info
*info
)
7724 for (info
->num_regsets
= 0;
7725 info
->regsets
[info
->num_regsets
].size
>= 0;
7726 info
->num_regsets
++)
7732 initialize_low (void)
7734 struct sigaction sigchld_action
;
7736 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7737 set_target_ops (&linux_target_ops
);
7739 linux_ptrace_init_warnings ();
7741 sigchld_action
.sa_handler
= sigchld_handler
;
7742 sigemptyset (&sigchld_action
.sa_mask
);
7743 sigchld_action
.sa_flags
= SA_RESTART
;
7744 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7746 initialize_low_arch ();
7748 linux_check_ptrace_features ();