1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2016 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "linux-low.h"
21 #include "nat/linux-osdata.h"
26 #include "nat/linux-nat.h"
27 #include "nat/linux-waitpid.h"
29 #include "nat/gdb_ptrace.h"
30 #include "nat/linux-ptrace.h"
31 #include "nat/linux-procfs.h"
32 #include "nat/linux-personality.h"
34 #include <sys/ioctl.h>
37 #include <sys/syscall.h>
41 #include <sys/types.h>
46 #include "filestuff.h"
47 #include "tracepoint.h"
51 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
52 then ELFMAG0 will have been defined. If it didn't get included by
53 gdb_proc_service.h then including it will likely introduce a duplicate
54 definition of elf_fpregset_t. */
57 #include "nat/linux-namespaces.h"
60 #define SPUFS_MAGIC 0x23c9b64e
63 #ifdef HAVE_PERSONALITY
64 # include <sys/personality.h>
65 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
66 # define ADDR_NO_RANDOMIZE 0x0040000
74 /* Some targets did not define these ptrace constants from the start,
75 so gdbserver defines them locally here. In the future, these may
76 be removed after they are added to asm/ptrace.h. */
77 #if !(defined(PT_TEXT_ADDR) \
78 || defined(PT_DATA_ADDR) \
79 || defined(PT_TEXT_END_ADDR))
80 #if defined(__mcoldfire__)
81 /* These are still undefined in 3.10 kernels. */
82 #define PT_TEXT_ADDR 49*4
83 #define PT_DATA_ADDR 50*4
84 #define PT_TEXT_END_ADDR 51*4
85 /* BFIN already defines these since at least 2.6.32 kernels. */
87 #define PT_TEXT_ADDR 220
88 #define PT_TEXT_END_ADDR 224
89 #define PT_DATA_ADDR 228
90 /* These are still undefined in 3.10 kernels. */
91 #elif defined(__TMS320C6X__)
92 #define PT_TEXT_ADDR (0x10000*4)
93 #define PT_DATA_ADDR (0x10004*4)
94 #define PT_TEXT_END_ADDR (0x10008*4)
98 #ifdef HAVE_LINUX_BTRACE
99 # include "nat/linux-btrace.h"
100 # include "btrace-common.h"
103 #ifndef HAVE_ELF32_AUXV_T
104 /* Copied from glibc's elf.h. */
107 uint32_t a_type
; /* Entry type */
110 uint32_t a_val
; /* Integer value */
111 /* We use to have pointer elements added here. We cannot do that,
112 though, since it does not work when using 32-bit definitions
113 on 64-bit platforms and vice versa. */
118 #ifndef HAVE_ELF64_AUXV_T
119 /* Copied from glibc's elf.h. */
122 uint64_t a_type
; /* Entry type */
125 uint64_t a_val
; /* Integer value */
126 /* We use to have pointer elements added here. We cannot do that,
127 though, since it does not work when using 32-bit definitions
128 on 64-bit platforms and vice versa. */
133 /* Does the current host support PTRACE_GETREGSET? */
134 int have_ptrace_getregset
= -1;
138 /* See nat/linux-nat.h. */
141 ptid_of_lwp (struct lwp_info
*lwp
)
143 return ptid_of (get_lwp_thread (lwp
));
146 /* See nat/linux-nat.h. */
149 lwp_set_arch_private_info (struct lwp_info
*lwp
,
150 struct arch_lwp_info
*info
)
152 lwp
->arch_private
= info
;
155 /* See nat/linux-nat.h. */
157 struct arch_lwp_info
*
158 lwp_arch_private_info (struct lwp_info
*lwp
)
160 return lwp
->arch_private
;
163 /* See nat/linux-nat.h. */
166 lwp_is_stopped (struct lwp_info
*lwp
)
171 /* See nat/linux-nat.h. */
173 enum target_stop_reason
174 lwp_stop_reason (struct lwp_info
*lwp
)
176 return lwp
->stop_reason
;
179 /* A list of all unknown processes which receive stop signals. Some
180 other process will presumably claim each of these as forked
181 children momentarily. */
183 struct simple_pid_list
185 /* The process ID. */
188 /* The status as reported by waitpid. */
192 struct simple_pid_list
*next
;
194 struct simple_pid_list
*stopped_pids
;
196 /* Trivial list manipulation functions to keep track of a list of new
197 stopped processes. */
200 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
202 struct simple_pid_list
*new_pid
= XNEW (struct simple_pid_list
);
205 new_pid
->status
= status
;
206 new_pid
->next
= *listp
;
211 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
213 struct simple_pid_list
**p
;
215 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
216 if ((*p
)->pid
== pid
)
218 struct simple_pid_list
*next
= (*p
)->next
;
220 *statusp
= (*p
)->status
;
228 enum stopping_threads_kind
230 /* Not stopping threads presently. */
231 NOT_STOPPING_THREADS
,
233 /* Stopping threads. */
236 /* Stopping and suspending threads. */
237 STOPPING_AND_SUSPENDING_THREADS
240 /* This is set while stop_all_lwps is in effect. */
241 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
243 /* FIXME make into a target method? */
244 int using_threads
= 1;
246 /* True if we're presently stabilizing threads (moving them out of
248 static int stabilizing_threads
;
250 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
251 int step
, int signal
, siginfo_t
*info
);
252 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
253 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
254 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
255 static void unsuspend_all_lwps (struct lwp_info
*except
);
256 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
257 int *wstat
, int options
);
258 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
259 static struct lwp_info
*add_lwp (ptid_t ptid
);
260 static void linux_mourn (struct process_info
*process
);
261 static int linux_stopped_by_watchpoint (void);
262 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
263 static int lwp_is_marked_dead (struct lwp_info
*lwp
);
264 static void proceed_all_lwps (void);
265 static int finish_step_over (struct lwp_info
*lwp
);
266 static int kill_lwp (unsigned long lwpid
, int signo
);
267 static void enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
);
268 static void complete_ongoing_step_over (void);
269 static int linux_low_ptrace_options (int attached
);
271 /* When the event-loop is doing a step-over, this points at the thread
273 ptid_t step_over_bkpt
;
275 /* True if the low target can hardware single-step. */
278 can_hardware_single_step (void)
280 if (the_low_target
.supports_hardware_single_step
!= NULL
)
281 return the_low_target
.supports_hardware_single_step ();
286 /* True if the low target can software single-step. Such targets
287 implement the GET_NEXT_PCS callback. */
290 can_software_single_step (void)
292 return (the_low_target
.get_next_pcs
!= NULL
);
295 /* True if the low target supports memory breakpoints. If so, we'll
296 have a GET_PC implementation. */
299 supports_breakpoints (void)
301 return (the_low_target
.get_pc
!= NULL
);
304 /* Returns true if this target can support fast tracepoints. This
305 does not mean that the in-process agent has been loaded in the
309 supports_fast_tracepoints (void)
311 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
314 /* True if LWP is stopped in its stepping range. */
317 lwp_in_step_range (struct lwp_info
*lwp
)
319 CORE_ADDR pc
= lwp
->stop_pc
;
321 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
324 struct pending_signals
328 struct pending_signals
*prev
;
331 /* The read/write ends of the pipe registered as waitable file in the
333 static int linux_event_pipe
[2] = { -1, -1 };
335 /* True if we're currently in async mode. */
336 #define target_is_async_p() (linux_event_pipe[0] != -1)
338 static void send_sigstop (struct lwp_info
*lwp
);
339 static void wait_for_sigstop (void);
341 /* Return non-zero if HEADER is a 64-bit ELF file. */
344 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
346 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
347 && header
->e_ident
[EI_MAG1
] == ELFMAG1
348 && header
->e_ident
[EI_MAG2
] == ELFMAG2
349 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
351 *machine
= header
->e_machine
;
352 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
359 /* Return non-zero if FILE is a 64-bit ELF file,
360 zero if the file is not a 64-bit ELF file,
361 and -1 if the file is not accessible or doesn't exist. */
364 elf_64_file_p (const char *file
, unsigned int *machine
)
369 fd
= open (file
, O_RDONLY
);
373 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
380 return elf_64_header_p (&header
, machine
);
383 /* Accepts an integer PID; Returns true if the executable PID is
384 running is a 64-bit ELF file.. */
387 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
391 sprintf (file
, "/proc/%d/exe", pid
);
392 return elf_64_file_p (file
, machine
);
396 delete_lwp (struct lwp_info
*lwp
)
398 struct thread_info
*thr
= get_lwp_thread (lwp
);
401 debug_printf ("deleting %ld\n", lwpid_of (thr
));
404 free (lwp
->arch_private
);
408 /* Add a process to the common process list, and set its private
411 static struct process_info
*
412 linux_add_process (int pid
, int attached
)
414 struct process_info
*proc
;
416 proc
= add_process (pid
, attached
);
417 proc
->priv
= XCNEW (struct process_info_private
);
419 if (the_low_target
.new_process
!= NULL
)
420 proc
->priv
->arch_private
= the_low_target
.new_process ();
425 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
427 /* Call the target arch_setup function on the current thread. */
430 linux_arch_setup (void)
432 the_low_target
.arch_setup ();
435 /* Call the target arch_setup function on THREAD. */
438 linux_arch_setup_thread (struct thread_info
*thread
)
440 struct thread_info
*saved_thread
;
442 saved_thread
= current_thread
;
443 current_thread
= thread
;
447 current_thread
= saved_thread
;
450 /* Handle a GNU/Linux extended wait response. If we see a clone,
451 fork, or vfork event, we need to add the new LWP to our list
452 (and return 0 so as not to report the trap to higher layers).
453 If we see an exec event, we will modify ORIG_EVENT_LWP to point
454 to a new LWP representing the new program. */
457 handle_extended_wait (struct lwp_info
**orig_event_lwp
, int wstat
)
459 struct lwp_info
*event_lwp
= *orig_event_lwp
;
460 int event
= linux_ptrace_get_extended_event (wstat
);
461 struct thread_info
*event_thr
= get_lwp_thread (event_lwp
);
462 struct lwp_info
*new_lwp
;
464 gdb_assert (event_lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
466 /* All extended events we currently use are mid-syscall. Only
467 PTRACE_EVENT_STOP is delivered more like a signal-stop, but
468 you have to be using PTRACE_SEIZE to get that. */
469 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
471 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
472 || (event
== PTRACE_EVENT_CLONE
))
475 unsigned long new_pid
;
478 /* Get the pid of the new lwp. */
479 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
482 /* If we haven't already seen the new PID stop, wait for it now. */
483 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
485 /* The new child has a pending SIGSTOP. We can't affect it until it
486 hits the SIGSTOP, but we're already attached. */
488 ret
= my_waitpid (new_pid
, &status
, __WALL
);
491 perror_with_name ("waiting for new child");
492 else if (ret
!= new_pid
)
493 warning ("wait returned unexpected PID %d", ret
);
494 else if (!WIFSTOPPED (status
))
495 warning ("wait returned unexpected status 0x%x", status
);
498 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
500 struct process_info
*parent_proc
;
501 struct process_info
*child_proc
;
502 struct lwp_info
*child_lwp
;
503 struct thread_info
*child_thr
;
504 struct target_desc
*tdesc
;
506 ptid
= ptid_build (new_pid
, new_pid
, 0);
510 debug_printf ("HEW: Got fork event from LWP %ld, "
512 ptid_get_lwp (ptid_of (event_thr
)),
513 ptid_get_pid (ptid
));
516 /* Add the new process to the tables and clone the breakpoint
517 lists of the parent. We need to do this even if the new process
518 will be detached, since we will need the process object and the
519 breakpoints to remove any breakpoints from memory when we
520 detach, and the client side will access registers. */
521 child_proc
= linux_add_process (new_pid
, 0);
522 gdb_assert (child_proc
!= NULL
);
523 child_lwp
= add_lwp (ptid
);
524 gdb_assert (child_lwp
!= NULL
);
525 child_lwp
->stopped
= 1;
526 child_lwp
->must_set_ptrace_flags
= 1;
527 child_lwp
->status_pending_p
= 0;
528 child_thr
= get_lwp_thread (child_lwp
);
529 child_thr
->last_resume_kind
= resume_stop
;
530 child_thr
->last_status
.kind
= TARGET_WAITKIND_STOPPED
;
532 /* If we're suspending all threads, leave this one suspended
533 too. If the fork/clone parent is stepping over a breakpoint,
534 all other threads have been suspended already. Leave the
535 child suspended too. */
536 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
537 || event_lwp
->bp_reinsert
!= 0)
540 debug_printf ("HEW: leaving child suspended\n");
541 child_lwp
->suspended
= 1;
544 parent_proc
= get_thread_process (event_thr
);
545 child_proc
->attached
= parent_proc
->attached
;
547 if (event_lwp
->bp_reinsert
!= 0
548 && can_software_single_step ()
549 && event
== PTRACE_EVENT_VFORK
)
551 struct thread_info
*saved_thread
= current_thread
;
553 current_thread
= event_thr
;
554 /* If we leave reinsert breakpoints there, child will
555 hit it, so uninsert reinsert breakpoints from parent
556 (and child). Once vfork child is done, reinsert
557 them back to parent. */
558 uninsert_reinsert_breakpoints ();
559 current_thread
= saved_thread
;
562 clone_all_breakpoints (&child_proc
->breakpoints
,
563 &child_proc
->raw_breakpoints
,
564 parent_proc
->breakpoints
);
566 tdesc
= XNEW (struct target_desc
);
567 copy_target_description (tdesc
, parent_proc
->tdesc
);
568 child_proc
->tdesc
= tdesc
;
570 /* Clone arch-specific process data. */
571 if (the_low_target
.new_fork
!= NULL
)
572 the_low_target
.new_fork (parent_proc
, child_proc
);
574 /* Save fork info in the parent thread. */
575 if (event
== PTRACE_EVENT_FORK
)
576 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
577 else if (event
== PTRACE_EVENT_VFORK
)
578 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
580 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
582 /* The status_pending field contains bits denoting the
583 extended event, so when the pending event is handled,
584 the handler will look at lwp->waitstatus. */
585 event_lwp
->status_pending_p
= 1;
586 event_lwp
->status_pending
= wstat
;
588 /* If the parent thread is doing step-over with reinsert
589 breakpoints, the list of reinsert breakpoints are cloned
590 from the parent's. Remove them from the child process.
591 In case of vfork, we'll reinsert them back once vforked
593 if (event_lwp
->bp_reinsert
!= 0
594 && can_software_single_step ())
596 struct thread_info
*saved_thread
= current_thread
;
598 /* The child process is forked and stopped, so it is safe
599 to access its memory without stopping all other threads
600 from other processes. */
601 current_thread
= child_thr
;
602 delete_reinsert_breakpoints ();
603 current_thread
= saved_thread
;
605 gdb_assert (has_reinsert_breakpoints (parent_proc
));
606 gdb_assert (!has_reinsert_breakpoints (child_proc
));
609 /* Report the event. */
614 debug_printf ("HEW: Got clone event "
615 "from LWP %ld, new child is LWP %ld\n",
616 lwpid_of (event_thr
), new_pid
);
618 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
619 new_lwp
= add_lwp (ptid
);
621 /* Either we're going to immediately resume the new thread
622 or leave it stopped. linux_resume_one_lwp is a nop if it
623 thinks the thread is currently running, so set this first
624 before calling linux_resume_one_lwp. */
625 new_lwp
->stopped
= 1;
627 /* If we're suspending all threads, leave this one suspended
628 too. If the fork/clone parent is stepping over a breakpoint,
629 all other threads have been suspended already. Leave the
630 child suspended too. */
631 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
632 || event_lwp
->bp_reinsert
!= 0)
633 new_lwp
->suspended
= 1;
635 /* Normally we will get the pending SIGSTOP. But in some cases
636 we might get another signal delivered to the group first.
637 If we do get another signal, be sure not to lose it. */
638 if (WSTOPSIG (status
) != SIGSTOP
)
640 new_lwp
->stop_expected
= 1;
641 new_lwp
->status_pending_p
= 1;
642 new_lwp
->status_pending
= status
;
644 else if (report_thread_events
)
646 new_lwp
->waitstatus
.kind
= TARGET_WAITKIND_THREAD_CREATED
;
647 new_lwp
->status_pending_p
= 1;
648 new_lwp
->status_pending
= status
;
651 /* Don't report the event. */
654 else if (event
== PTRACE_EVENT_VFORK_DONE
)
656 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
658 if (event_lwp
->bp_reinsert
!= 0 && can_software_single_step ())
660 struct thread_info
*saved_thread
= current_thread
;
661 struct process_info
*proc
= get_thread_process (event_thr
);
663 current_thread
= event_thr
;
664 reinsert_reinsert_breakpoints ();
665 current_thread
= saved_thread
;
667 gdb_assert (has_reinsert_breakpoints (proc
));
670 /* Report the event. */
673 else if (event
== PTRACE_EVENT_EXEC
&& report_exec_events
)
675 struct process_info
*proc
;
676 VEC (int) *syscalls_to_catch
;
682 debug_printf ("HEW: Got exec event from LWP %ld\n",
683 lwpid_of (event_thr
));
686 /* Get the event ptid. */
687 event_ptid
= ptid_of (event_thr
);
688 event_pid
= ptid_get_pid (event_ptid
);
690 /* Save the syscall list from the execing process. */
691 proc
= get_thread_process (event_thr
);
692 syscalls_to_catch
= proc
->syscalls_to_catch
;
693 proc
->syscalls_to_catch
= NULL
;
695 /* Delete the execing process and all its threads. */
697 current_thread
= NULL
;
699 /* Create a new process/lwp/thread. */
700 proc
= linux_add_process (event_pid
, 0);
701 event_lwp
= add_lwp (event_ptid
);
702 event_thr
= get_lwp_thread (event_lwp
);
703 gdb_assert (current_thread
== event_thr
);
704 linux_arch_setup_thread (event_thr
);
706 /* Set the event status. */
707 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
708 event_lwp
->waitstatus
.value
.execd_pathname
709 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
711 /* Mark the exec status as pending. */
712 event_lwp
->stopped
= 1;
713 event_lwp
->status_pending_p
= 1;
714 event_lwp
->status_pending
= wstat
;
715 event_thr
->last_resume_kind
= resume_continue
;
716 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
718 /* Update syscall state in the new lwp, effectively mid-syscall too. */
719 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
721 /* Restore the list to catch. Don't rely on the client, which is free
722 to avoid sending a new list when the architecture doesn't change.
723 Also, for ANY_SYSCALL, the architecture doesn't really matter. */
724 proc
->syscalls_to_catch
= syscalls_to_catch
;
726 /* Report the event. */
727 *orig_event_lwp
= event_lwp
;
731 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
734 /* Return the PC as read from the regcache of LWP, without any
738 get_pc (struct lwp_info
*lwp
)
740 struct thread_info
*saved_thread
;
741 struct regcache
*regcache
;
744 if (the_low_target
.get_pc
== NULL
)
747 saved_thread
= current_thread
;
748 current_thread
= get_lwp_thread (lwp
);
750 regcache
= get_thread_regcache (current_thread
, 1);
751 pc
= (*the_low_target
.get_pc
) (regcache
);
754 debug_printf ("pc is 0x%lx\n", (long) pc
);
756 current_thread
= saved_thread
;
760 /* This function should only be called if LWP got a SYSCALL_SIGTRAP.
761 Fill *SYSNO with the syscall nr trapped. Fill *SYSRET with the
765 get_syscall_trapinfo (struct lwp_info
*lwp
, int *sysno
, int *sysret
)
767 struct thread_info
*saved_thread
;
768 struct regcache
*regcache
;
770 if (the_low_target
.get_syscall_trapinfo
== NULL
)
772 /* If we cannot get the syscall trapinfo, report an unknown
773 system call number and -ENOSYS return value. */
774 *sysno
= UNKNOWN_SYSCALL
;
779 saved_thread
= current_thread
;
780 current_thread
= get_lwp_thread (lwp
);
782 regcache
= get_thread_regcache (current_thread
, 1);
783 (*the_low_target
.get_syscall_trapinfo
) (regcache
, sysno
, sysret
);
787 debug_printf ("get_syscall_trapinfo sysno %d sysret %d\n",
791 current_thread
= saved_thread
;
794 static int check_stopped_by_watchpoint (struct lwp_info
*child
);
796 /* Called when the LWP stopped for a signal/trap. If it stopped for a
797 trap check what caused it (breakpoint, watchpoint, trace, etc.),
798 and save the result in the LWP's stop_reason field. If it stopped
799 for a breakpoint, decrement the PC if necessary on the lwp's
800 architecture. Returns true if we now have the LWP's stop PC. */
803 save_stop_reason (struct lwp_info
*lwp
)
806 CORE_ADDR sw_breakpoint_pc
;
807 struct thread_info
*saved_thread
;
808 #if USE_SIGTRAP_SIGINFO
812 if (the_low_target
.get_pc
== NULL
)
816 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
818 /* breakpoint_at reads from the current thread. */
819 saved_thread
= current_thread
;
820 current_thread
= get_lwp_thread (lwp
);
822 #if USE_SIGTRAP_SIGINFO
823 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
824 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
826 if (siginfo
.si_signo
== SIGTRAP
)
828 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
)
829 && GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
831 /* The si_code is ambiguous on this arch -- check debug
833 if (!check_stopped_by_watchpoint (lwp
))
834 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
836 else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
838 /* If we determine the LWP stopped for a SW breakpoint,
839 trust it. Particularly don't check watchpoint
840 registers, because at least on s390, we'd find
841 stopped-by-watchpoint as long as there's a watchpoint
843 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
845 else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
847 /* This can indicate either a hardware breakpoint or
848 hardware watchpoint. Check debug registers. */
849 if (!check_stopped_by_watchpoint (lwp
))
850 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
852 else if (siginfo
.si_code
== TRAP_TRACE
)
854 /* We may have single stepped an instruction that
855 triggered a watchpoint. In that case, on some
856 architectures (such as x86), instead of TRAP_HWBKPT,
857 si_code indicates TRAP_TRACE, and we need to check
858 the debug registers separately. */
859 if (!check_stopped_by_watchpoint (lwp
))
860 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
865 /* We may have just stepped a breakpoint instruction. E.g., in
866 non-stop mode, GDB first tells the thread A to step a range, and
867 then the user inserts a breakpoint inside the range. In that
868 case we need to report the breakpoint PC. */
869 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
870 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
871 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
873 if (hardware_breakpoint_inserted_here (pc
))
874 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
876 if (lwp
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
)
877 check_stopped_by_watchpoint (lwp
);
880 if (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
884 struct thread_info
*thr
= get_lwp_thread (lwp
);
886 debug_printf ("CSBB: %s stopped by software breakpoint\n",
887 target_pid_to_str (ptid_of (thr
)));
890 /* Back up the PC if necessary. */
891 if (pc
!= sw_breakpoint_pc
)
893 struct regcache
*regcache
894 = get_thread_regcache (current_thread
, 1);
895 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
898 /* Update this so we record the correct stop PC below. */
899 pc
= sw_breakpoint_pc
;
901 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
)
905 struct thread_info
*thr
= get_lwp_thread (lwp
);
907 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
908 target_pid_to_str (ptid_of (thr
)));
911 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
915 struct thread_info
*thr
= get_lwp_thread (lwp
);
917 debug_printf ("CSBB: %s stopped by hardware watchpoint\n",
918 target_pid_to_str (ptid_of (thr
)));
921 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
)
925 struct thread_info
*thr
= get_lwp_thread (lwp
);
927 debug_printf ("CSBB: %s stopped by trace\n",
928 target_pid_to_str (ptid_of (thr
)));
933 current_thread
= saved_thread
;
937 static struct lwp_info
*
938 add_lwp (ptid_t ptid
)
940 struct lwp_info
*lwp
;
942 lwp
= XCNEW (struct lwp_info
);
944 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
946 if (the_low_target
.new_thread
!= NULL
)
947 the_low_target
.new_thread (lwp
);
949 lwp
->thread
= add_thread (ptid
, lwp
);
954 /* Start an inferior process and returns its pid.
955 ALLARGS is a vector of program-name and args. */
958 linux_create_inferior (char *program
, char **allargs
)
960 struct lwp_info
*new_lwp
;
963 struct cleanup
*restore_personality
964 = maybe_disable_address_space_randomization (disable_randomization
);
966 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
972 perror_with_name ("fork");
977 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
981 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
982 stdout to stderr so that inferior i/o doesn't corrupt the connection.
983 Also, redirect stdin to /dev/null. */
984 if (remote_connection_is_stdio ())
987 open ("/dev/null", O_RDONLY
);
989 if (write (2, "stdin/stdout redirected\n",
990 sizeof ("stdin/stdout redirected\n") - 1) < 0)
992 /* Errors ignored. */;
996 execv (program
, allargs
);
998 execvp (program
, allargs
);
1000 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
1006 do_cleanups (restore_personality
);
1008 linux_add_process (pid
, 0);
1010 ptid
= ptid_build (pid
, pid
, 0);
1011 new_lwp
= add_lwp (ptid
);
1012 new_lwp
->must_set_ptrace_flags
= 1;
1017 /* Implement the post_create_inferior target_ops method. */
1020 linux_post_create_inferior (void)
1022 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
1024 linux_arch_setup ();
1026 if (lwp
->must_set_ptrace_flags
)
1028 struct process_info
*proc
= current_process ();
1029 int options
= linux_low_ptrace_options (proc
->attached
);
1031 linux_enable_event_reporting (lwpid_of (current_thread
), options
);
1032 lwp
->must_set_ptrace_flags
= 0;
1036 /* Attach to an inferior process. Returns 0 on success, ERRNO on
1040 linux_attach_lwp (ptid_t ptid
)
1042 struct lwp_info
*new_lwp
;
1043 int lwpid
= ptid_get_lwp (ptid
);
1045 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
1049 new_lwp
= add_lwp (ptid
);
1051 /* We need to wait for SIGSTOP before being able to make the next
1052 ptrace call on this LWP. */
1053 new_lwp
->must_set_ptrace_flags
= 1;
1055 if (linux_proc_pid_is_stopped (lwpid
))
1058 debug_printf ("Attached to a stopped process\n");
1060 /* The process is definitely stopped. It is in a job control
1061 stop, unless the kernel predates the TASK_STOPPED /
1062 TASK_TRACED distinction, in which case it might be in a
1063 ptrace stop. Make sure it is in a ptrace stop; from there we
1064 can kill it, signal it, et cetera.
1066 First make sure there is a pending SIGSTOP. Since we are
1067 already attached, the process can not transition from stopped
1068 to running without a PTRACE_CONT; so we know this signal will
1069 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1070 probably already in the queue (unless this kernel is old
1071 enough to use TASK_STOPPED for ptrace stops); but since
1072 SIGSTOP is not an RT signal, it can only be queued once. */
1073 kill_lwp (lwpid
, SIGSTOP
);
1075 /* Finally, resume the stopped process. This will deliver the
1076 SIGSTOP (or a higher priority signal, just like normal
1077 PTRACE_ATTACH), which we'll catch later on. */
1078 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1081 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
1082 brings it to a halt.
1084 There are several cases to consider here:
1086 1) gdbserver has already attached to the process and is being notified
1087 of a new thread that is being created.
1088 In this case we should ignore that SIGSTOP and resume the
1089 process. This is handled below by setting stop_expected = 1,
1090 and the fact that add_thread sets last_resume_kind ==
1093 2) This is the first thread (the process thread), and we're attaching
1094 to it via attach_inferior.
1095 In this case we want the process thread to stop.
1096 This is handled by having linux_attach set last_resume_kind ==
1097 resume_stop after we return.
1099 If the pid we are attaching to is also the tgid, we attach to and
1100 stop all the existing threads. Otherwise, we attach to pid and
1101 ignore any other threads in the same group as this pid.
1103 3) GDB is connecting to gdbserver and is requesting an enumeration of all
1105 In this case we want the thread to stop.
1106 FIXME: This case is currently not properly handled.
1107 We should wait for the SIGSTOP but don't. Things work apparently
1108 because enough time passes between when we ptrace (ATTACH) and when
1109 gdb makes the next ptrace call on the thread.
1111 On the other hand, if we are currently trying to stop all threads, we
1112 should treat the new thread as if we had sent it a SIGSTOP. This works
1113 because we are guaranteed that the add_lwp call above added us to the
1114 end of the list, and so the new thread has not yet reached
1115 wait_for_sigstop (but will). */
1116 new_lwp
->stop_expected
= 1;
1121 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
1122 already attached. Returns true if a new LWP is found, false
1126 attach_proc_task_lwp_callback (ptid_t ptid
)
1128 /* Is this a new thread? */
1129 if (find_thread_ptid (ptid
) == NULL
)
1131 int lwpid
= ptid_get_lwp (ptid
);
1135 debug_printf ("Found new lwp %d\n", lwpid
);
1137 err
= linux_attach_lwp (ptid
);
1139 /* Be quiet if we simply raced with the thread exiting. EPERM
1140 is returned if the thread's task still exists, and is marked
1141 as exited or zombie, as well as other conditions, so in that
1142 case, confirm the status in /proc/PID/status. */
1144 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1148 debug_printf ("Cannot attach to lwp %d: "
1149 "thread is gone (%d: %s)\n",
1150 lwpid
, err
, strerror (err
));
1155 warning (_("Cannot attach to lwp %d: %s"),
1157 linux_ptrace_attach_fail_reason_string (ptid
, err
));
1165 static void async_file_mark (void);
1167 /* Attach to PID. If PID is the tgid, attach to it and all
1171 linux_attach (unsigned long pid
)
1173 struct process_info
*proc
;
1174 struct thread_info
*initial_thread
;
1175 ptid_t ptid
= ptid_build (pid
, pid
, 0);
1178 /* Attach to PID. We will check for other threads
1180 err
= linux_attach_lwp (ptid
);
1182 error ("Cannot attach to process %ld: %s",
1183 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
1185 proc
= linux_add_process (pid
, 1);
1187 /* Don't ignore the initial SIGSTOP if we just attached to this
1188 process. It will be collected by wait shortly. */
1189 initial_thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
1190 initial_thread
->last_resume_kind
= resume_stop
;
1192 /* We must attach to every LWP. If /proc is mounted, use that to
1193 find them now. On the one hand, the inferior may be using raw
1194 clone instead of using pthreads. On the other hand, even if it
1195 is using pthreads, GDB may not be connected yet (thread_db needs
1196 to do symbol lookups, through qSymbol). Also, thread_db walks
1197 structures in the inferior's address space to find the list of
1198 threads/LWPs, and those structures may well be corrupted. Note
1199 that once thread_db is loaded, we'll still use it to list threads
1200 and associate pthread info with each LWP. */
1201 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1203 /* GDB will shortly read the xml target description for this
1204 process, to figure out the process' architecture. But the target
1205 description is only filled in when the first process/thread in
1206 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1207 that now, otherwise, if GDB is fast enough, it could read the
1208 target description _before_ that initial stop. */
1211 struct lwp_info
*lwp
;
1213 ptid_t pid_ptid
= pid_to_ptid (pid
);
1215 lwpid
= linux_wait_for_event_filtered (pid_ptid
, pid_ptid
,
1217 gdb_assert (lwpid
> 0);
1219 lwp
= find_lwp_pid (pid_to_ptid (lwpid
));
1221 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGSTOP
)
1223 lwp
->status_pending_p
= 1;
1224 lwp
->status_pending
= wstat
;
1227 initial_thread
->last_resume_kind
= resume_continue
;
1231 gdb_assert (proc
->tdesc
!= NULL
);
1244 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
1246 struct counter
*counter
= (struct counter
*) args
;
1248 if (ptid_get_pid (entry
->id
) == counter
->pid
)
1250 if (++counter
->count
> 1)
1258 last_thread_of_process_p (int pid
)
1260 struct counter counter
= { pid
, 0 };
1262 return (find_inferior (&all_threads
,
1263 second_thread_of_pid_p
, &counter
) == NULL
);
1269 linux_kill_one_lwp (struct lwp_info
*lwp
)
1271 struct thread_info
*thr
= get_lwp_thread (lwp
);
1272 int pid
= lwpid_of (thr
);
1274 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1275 there is no signal context, and ptrace(PTRACE_KILL) (or
1276 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1277 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1278 alternative is to kill with SIGKILL. We only need one SIGKILL
1279 per process, not one for each thread. But since we still support
1280 support debugging programs using raw clone without CLONE_THREAD,
1281 we send one for each thread. For years, we used PTRACE_KILL
1282 only, so we're being a bit paranoid about some old kernels where
1283 PTRACE_KILL might work better (dubious if there are any such, but
1284 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1285 second, and so we're fine everywhere. */
1288 kill_lwp (pid
, SIGKILL
);
1291 int save_errno
= errno
;
1293 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1294 target_pid_to_str (ptid_of (thr
)),
1295 save_errno
? strerror (save_errno
) : "OK");
1299 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1302 int save_errno
= errno
;
1304 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1305 target_pid_to_str (ptid_of (thr
)),
1306 save_errno
? strerror (save_errno
) : "OK");
1310 /* Kill LWP and wait for it to die. */
1313 kill_wait_lwp (struct lwp_info
*lwp
)
1315 struct thread_info
*thr
= get_lwp_thread (lwp
);
1316 int pid
= ptid_get_pid (ptid_of (thr
));
1317 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1322 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1326 linux_kill_one_lwp (lwp
);
1328 /* Make sure it died. Notes:
1330 - The loop is most likely unnecessary.
1332 - We don't use linux_wait_for_event as that could delete lwps
1333 while we're iterating over them. We're not interested in
1334 any pending status at this point, only in making sure all
1335 wait status on the kernel side are collected until the
1338 - We don't use __WALL here as the __WALL emulation relies on
1339 SIGCHLD, and killing a stopped process doesn't generate
1340 one, nor an exit status.
1342 res
= my_waitpid (lwpid
, &wstat
, 0);
1343 if (res
== -1 && errno
== ECHILD
)
1344 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1345 } while (res
> 0 && WIFSTOPPED (wstat
));
1347 /* Even if it was stopped, the child may have already disappeared.
1348 E.g., if it was killed by SIGKILL. */
1349 if (res
< 0 && errno
!= ECHILD
)
1350 perror_with_name ("kill_wait_lwp");
1353 /* Callback for `find_inferior'. Kills an lwp of a given process,
1354 except the leader. */
1357 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1359 struct thread_info
*thread
= (struct thread_info
*) entry
;
1360 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1361 int pid
= * (int *) args
;
1363 if (ptid_get_pid (entry
->id
) != pid
)
1366 /* We avoid killing the first thread here, because of a Linux kernel (at
1367 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1368 the children get a chance to be reaped, it will remain a zombie
1371 if (lwpid_of (thread
) == pid
)
1374 debug_printf ("lkop: is last of process %s\n",
1375 target_pid_to_str (entry
->id
));
1379 kill_wait_lwp (lwp
);
1384 linux_kill (int pid
)
1386 struct process_info
*process
;
1387 struct lwp_info
*lwp
;
1389 process
= find_process_pid (pid
);
1390 if (process
== NULL
)
1393 /* If we're killing a running inferior, make sure it is stopped
1394 first, as PTRACE_KILL will not work otherwise. */
1395 stop_all_lwps (0, NULL
);
1397 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1399 /* See the comment in linux_kill_one_lwp. We did not kill the first
1400 thread in the list, so do so now. */
1401 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1406 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1410 kill_wait_lwp (lwp
);
1412 the_target
->mourn (process
);
1414 /* Since we presently can only stop all lwps of all processes, we
1415 need to unstop lwps of other processes. */
1416 unstop_all_lwps (0, NULL
);
1420 /* Get pending signal of THREAD, for detaching purposes. This is the
1421 signal the thread last stopped for, which we need to deliver to the
1422 thread when detaching, otherwise, it'd be suppressed/lost. */
1425 get_detach_signal (struct thread_info
*thread
)
1427 enum gdb_signal signo
= GDB_SIGNAL_0
;
1429 struct lwp_info
*lp
= get_thread_lwp (thread
);
1431 if (lp
->status_pending_p
)
1432 status
= lp
->status_pending
;
1435 /* If the thread had been suspended by gdbserver, and it stopped
1436 cleanly, then it'll have stopped with SIGSTOP. But we don't
1437 want to deliver that SIGSTOP. */
1438 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1439 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1442 /* Otherwise, we may need to deliver the signal we
1444 status
= lp
->last_status
;
1447 if (!WIFSTOPPED (status
))
1450 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1451 target_pid_to_str (ptid_of (thread
)));
1455 /* Extended wait statuses aren't real SIGTRAPs. */
1456 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1459 debug_printf ("GPS: lwp %s had stopped with extended "
1460 "status: no pending signal\n",
1461 target_pid_to_str (ptid_of (thread
)));
1465 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1467 if (program_signals_p
&& !program_signals
[signo
])
1470 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1471 target_pid_to_str (ptid_of (thread
)),
1472 gdb_signal_to_string (signo
));
1475 else if (!program_signals_p
1476 /* If we have no way to know which signals GDB does not
1477 want to have passed to the program, assume
1478 SIGTRAP/SIGINT, which is GDB's default. */
1479 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1482 debug_printf ("GPS: lwp %s had signal %s, "
1483 "but we don't know if we should pass it. "
1484 "Default to not.\n",
1485 target_pid_to_str (ptid_of (thread
)),
1486 gdb_signal_to_string (signo
));
1492 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1493 target_pid_to_str (ptid_of (thread
)),
1494 gdb_signal_to_string (signo
));
1496 return WSTOPSIG (status
);
1501 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
1503 struct thread_info
*thread
= (struct thread_info
*) entry
;
1504 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1505 int pid
= * (int *) args
;
1508 if (ptid_get_pid (entry
->id
) != pid
)
1511 /* If there is a pending SIGSTOP, get rid of it. */
1512 if (lwp
->stop_expected
)
1515 debug_printf ("Sending SIGCONT to %s\n",
1516 target_pid_to_str (ptid_of (thread
)));
1518 kill_lwp (lwpid_of (thread
), SIGCONT
);
1519 lwp
->stop_expected
= 0;
1522 /* Flush any pending changes to the process's registers. */
1523 regcache_invalidate_thread (thread
);
1525 /* Pass on any pending signal for this thread. */
1526 sig
= get_detach_signal (thread
);
1528 /* Finally, let it resume. */
1529 if (the_low_target
.prepare_to_resume
!= NULL
)
1530 the_low_target
.prepare_to_resume (lwp
);
1531 if (ptrace (PTRACE_DETACH
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1532 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1533 error (_("Can't detach %s: %s"),
1534 target_pid_to_str (ptid_of (thread
)),
1542 linux_detach (int pid
)
1544 struct process_info
*process
;
1546 process
= find_process_pid (pid
);
1547 if (process
== NULL
)
1550 /* As there's a step over already in progress, let it finish first,
1551 otherwise nesting a stabilize_threads operation on top gets real
1553 complete_ongoing_step_over ();
1555 /* Stop all threads before detaching. First, ptrace requires that
1556 the thread is stopped to sucessfully detach. Second, thread_db
1557 may need to uninstall thread event breakpoints from memory, which
1558 only works with a stopped process anyway. */
1559 stop_all_lwps (0, NULL
);
1561 #ifdef USE_THREAD_DB
1562 thread_db_detach (process
);
1565 /* Stabilize threads (move out of jump pads). */
1566 stabilize_threads ();
1568 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
1570 the_target
->mourn (process
);
1572 /* Since we presently can only stop all lwps of all processes, we
1573 need to unstop lwps of other processes. */
1574 unstop_all_lwps (0, NULL
);
1578 /* Remove all LWPs that belong to process PROC from the lwp list. */
1581 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1583 struct thread_info
*thread
= (struct thread_info
*) entry
;
1584 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1585 struct process_info
*process
= (struct process_info
*) proc
;
1587 if (pid_of (thread
) == pid_of (process
))
1594 linux_mourn (struct process_info
*process
)
1596 struct process_info_private
*priv
;
1598 #ifdef USE_THREAD_DB
1599 thread_db_mourn (process
);
1602 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1604 /* Freeing all private data. */
1605 priv
= process
->priv
;
1606 free (priv
->arch_private
);
1608 process
->priv
= NULL
;
1610 remove_process (process
);
1614 linux_join (int pid
)
1619 ret
= my_waitpid (pid
, &status
, 0);
1620 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1622 } while (ret
!= -1 || errno
!= ECHILD
);
1625 /* Return nonzero if the given thread is still alive. */
1627 linux_thread_alive (ptid_t ptid
)
1629 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1631 /* We assume we always know if a thread exits. If a whole process
1632 exited but we still haven't been able to report it to GDB, we'll
1633 hold on to the last lwp of the dead process. */
1635 return !lwp_is_marked_dead (lwp
);
1640 /* Return 1 if this lwp still has an interesting status pending. If
1641 not (e.g., it had stopped for a breakpoint that is gone), return
1645 thread_still_has_status_pending_p (struct thread_info
*thread
)
1647 struct lwp_info
*lp
= get_thread_lwp (thread
);
1649 if (!lp
->status_pending_p
)
1652 if (thread
->last_resume_kind
!= resume_stop
1653 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1654 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1656 struct thread_info
*saved_thread
;
1660 gdb_assert (lp
->last_status
!= 0);
1664 saved_thread
= current_thread
;
1665 current_thread
= thread
;
1667 if (pc
!= lp
->stop_pc
)
1670 debug_printf ("PC of %ld changed\n",
1675 #if !USE_SIGTRAP_SIGINFO
1676 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1677 && !(*the_low_target
.breakpoint_at
) (pc
))
1680 debug_printf ("previous SW breakpoint of %ld gone\n",
1684 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1685 && !hardware_breakpoint_inserted_here (pc
))
1688 debug_printf ("previous HW breakpoint of %ld gone\n",
1694 current_thread
= saved_thread
;
1699 debug_printf ("discarding pending breakpoint status\n");
1700 lp
->status_pending_p
= 0;
1708 /* Returns true if LWP is resumed from the client's perspective. */
1711 lwp_resumed (struct lwp_info
*lwp
)
1713 struct thread_info
*thread
= get_lwp_thread (lwp
);
1715 if (thread
->last_resume_kind
!= resume_stop
)
1718 /* Did gdb send us a `vCont;t', but we haven't reported the
1719 corresponding stop to gdb yet? If so, the thread is still
1720 resumed/running from gdb's perspective. */
1721 if (thread
->last_resume_kind
== resume_stop
1722 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1728 /* Return 1 if this lwp has an interesting status pending. */
1730 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1732 struct thread_info
*thread
= (struct thread_info
*) entry
;
1733 struct lwp_info
*lp
= get_thread_lwp (thread
);
1734 ptid_t ptid
= * (ptid_t
*) arg
;
1736 /* Check if we're only interested in events from a specific process
1737 or a specific LWP. */
1738 if (!ptid_match (ptid_of (thread
), ptid
))
1741 if (!lwp_resumed (lp
))
1744 if (lp
->status_pending_p
1745 && !thread_still_has_status_pending_p (thread
))
1747 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1751 return lp
->status_pending_p
;
1755 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1757 ptid_t ptid
= *(ptid_t
*) data
;
1760 if (ptid_get_lwp (ptid
) != 0)
1761 lwp
= ptid_get_lwp (ptid
);
1763 lwp
= ptid_get_pid (ptid
);
1765 if (ptid_get_lwp (entry
->id
) == lwp
)
1772 find_lwp_pid (ptid_t ptid
)
1774 struct inferior_list_entry
*thread
1775 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1780 return get_thread_lwp ((struct thread_info
*) thread
);
1783 /* Return the number of known LWPs in the tgid given by PID. */
1788 struct inferior_list_entry
*inf
, *tmp
;
1791 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1793 if (ptid_get_pid (inf
->id
) == pid
)
1800 /* The arguments passed to iterate_over_lwps. */
1802 struct iterate_over_lwps_args
1804 /* The FILTER argument passed to iterate_over_lwps. */
1807 /* The CALLBACK argument passed to iterate_over_lwps. */
1808 iterate_over_lwps_ftype
*callback
;
1810 /* The DATA argument passed to iterate_over_lwps. */
1814 /* Callback for find_inferior used by iterate_over_lwps to filter
1815 calls to the callback supplied to that function. Returning a
1816 nonzero value causes find_inferiors to stop iterating and return
1817 the current inferior_list_entry. Returning zero indicates that
1818 find_inferiors should continue iterating. */
1821 iterate_over_lwps_filter (struct inferior_list_entry
*entry
, void *args_p
)
1823 struct iterate_over_lwps_args
*args
1824 = (struct iterate_over_lwps_args
*) args_p
;
1826 if (ptid_match (entry
->id
, args
->filter
))
1828 struct thread_info
*thr
= (struct thread_info
*) entry
;
1829 struct lwp_info
*lwp
= get_thread_lwp (thr
);
1831 return (*args
->callback
) (lwp
, args
->data
);
1837 /* See nat/linux-nat.h. */
1840 iterate_over_lwps (ptid_t filter
,
1841 iterate_over_lwps_ftype callback
,
1844 struct iterate_over_lwps_args args
= {filter
, callback
, data
};
1845 struct inferior_list_entry
*entry
;
1847 entry
= find_inferior (&all_threads
, iterate_over_lwps_filter
, &args
);
1851 return get_thread_lwp ((struct thread_info
*) entry
);
1854 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1855 their exits until all other threads in the group have exited. */
1858 check_zombie_leaders (void)
1860 struct process_info
*proc
, *tmp
;
1862 ALL_PROCESSES (proc
, tmp
)
1864 pid_t leader_pid
= pid_of (proc
);
1865 struct lwp_info
*leader_lp
;
1867 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1870 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1871 "num_lwps=%d, zombie=%d\n",
1872 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1873 linux_proc_pid_is_zombie (leader_pid
));
1875 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1876 /* Check if there are other threads in the group, as we may
1877 have raced with the inferior simply exiting. */
1878 && !last_thread_of_process_p (leader_pid
)
1879 && linux_proc_pid_is_zombie (leader_pid
))
1881 /* A leader zombie can mean one of two things:
1883 - It exited, and there's an exit status pending
1884 available, or only the leader exited (not the whole
1885 program). In the latter case, we can't waitpid the
1886 leader's exit status until all other threads are gone.
1888 - There are 3 or more threads in the group, and a thread
1889 other than the leader exec'd. On an exec, the Linux
1890 kernel destroys all other threads (except the execing
1891 one) in the thread group, and resets the execing thread's
1892 tid to the tgid. No exit notification is sent for the
1893 execing thread -- from the ptracer's perspective, it
1894 appears as though the execing thread just vanishes.
1895 Until we reap all other threads except the leader and the
1896 execing thread, the leader will be zombie, and the
1897 execing thread will be in `D (disc sleep)'. As soon as
1898 all other threads are reaped, the execing thread changes
1899 it's tid to the tgid, and the previous (zombie) leader
1900 vanishes, giving place to the "new" leader. We could try
1901 distinguishing the exit and exec cases, by waiting once
1902 more, and seeing if something comes out, but it doesn't
1903 sound useful. The previous leader _does_ go away, and
1904 we'll re-add the new one once we see the exec event
1905 (which is just the same as what would happen if the
1906 previous leader did exit voluntarily before some other
1911 "CZL: Thread group leader %d zombie "
1912 "(it exited, or another thread execd).\n",
1915 delete_lwp (leader_lp
);
1920 /* Callback for `find_inferior'. Returns the first LWP that is not
1921 stopped. ARG is a PTID filter. */
1924 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
1926 struct thread_info
*thr
= (struct thread_info
*) entry
;
1927 struct lwp_info
*lwp
;
1928 ptid_t filter
= *(ptid_t
*) arg
;
1930 if (!ptid_match (ptid_of (thr
), filter
))
1933 lwp
= get_thread_lwp (thr
);
1940 /* Increment LWP's suspend count. */
1943 lwp_suspended_inc (struct lwp_info
*lwp
)
1947 if (debug_threads
&& lwp
->suspended
> 4)
1949 struct thread_info
*thread
= get_lwp_thread (lwp
);
1951 debug_printf ("LWP %ld has a suspiciously high suspend count,"
1952 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
1956 /* Decrement LWP's suspend count. */
1959 lwp_suspended_decr (struct lwp_info
*lwp
)
1963 if (lwp
->suspended
< 0)
1965 struct thread_info
*thread
= get_lwp_thread (lwp
);
1967 internal_error (__FILE__
, __LINE__
,
1968 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
1973 /* This function should only be called if the LWP got a SIGTRAP.
1975 Handle any tracepoint steps or hits. Return true if a tracepoint
1976 event was handled, 0 otherwise. */
1979 handle_tracepoints (struct lwp_info
*lwp
)
1981 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1982 int tpoint_related_event
= 0;
1984 gdb_assert (lwp
->suspended
== 0);
1986 /* If this tracepoint hit causes a tracing stop, we'll immediately
1987 uninsert tracepoints. To do this, we temporarily pause all
1988 threads, unpatch away, and then unpause threads. We need to make
1989 sure the unpausing doesn't resume LWP too. */
1990 lwp_suspended_inc (lwp
);
1992 /* And we need to be sure that any all-threads-stopping doesn't try
1993 to move threads out of the jump pads, as it could deadlock the
1994 inferior (LWP could be in the jump pad, maybe even holding the
1997 /* Do any necessary step collect actions. */
1998 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2000 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2002 /* See if we just hit a tracepoint and do its main collect
2004 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2006 lwp_suspended_decr (lwp
);
2008 gdb_assert (lwp
->suspended
== 0);
2009 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
2011 if (tpoint_related_event
)
2014 debug_printf ("got a tracepoint event\n");
2021 /* Convenience wrapper. Returns true if LWP is presently collecting a
2025 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2026 struct fast_tpoint_collect_status
*status
)
2028 CORE_ADDR thread_area
;
2029 struct thread_info
*thread
= get_lwp_thread (lwp
);
2031 if (the_low_target
.get_thread_area
== NULL
)
2034 /* Get the thread area address. This is used to recognize which
2035 thread is which when tracing with the in-process agent library.
2036 We don't read anything from the address, and treat it as opaque;
2037 it's the address itself that we assume is unique per-thread. */
2038 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2041 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2044 /* The reason we resume in the caller, is because we want to be able
2045 to pass lwp->status_pending as WSTAT, and we need to clear
2046 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2047 refuses to resume. */
2050 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2052 struct thread_info
*saved_thread
;
2054 saved_thread
= current_thread
;
2055 current_thread
= get_lwp_thread (lwp
);
2058 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2059 && supports_fast_tracepoints ()
2060 && agent_loaded_p ())
2062 struct fast_tpoint_collect_status status
;
2066 debug_printf ("Checking whether LWP %ld needs to move out of the "
2068 lwpid_of (current_thread
));
2070 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
2073 || (WSTOPSIG (*wstat
) != SIGILL
2074 && WSTOPSIG (*wstat
) != SIGFPE
2075 && WSTOPSIG (*wstat
) != SIGSEGV
2076 && WSTOPSIG (*wstat
) != SIGBUS
))
2078 lwp
->collecting_fast_tracepoint
= r
;
2082 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
2084 /* Haven't executed the original instruction yet.
2085 Set breakpoint there, and wait till it's hit,
2086 then single-step until exiting the jump pad. */
2087 lwp
->exit_jump_pad_bkpt
2088 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2092 debug_printf ("Checking whether LWP %ld needs to move out of "
2093 "the jump pad...it does\n",
2094 lwpid_of (current_thread
));
2095 current_thread
= saved_thread
;
2102 /* If we get a synchronous signal while collecting, *and*
2103 while executing the (relocated) original instruction,
2104 reset the PC to point at the tpoint address, before
2105 reporting to GDB. Otherwise, it's an IPA lib bug: just
2106 report the signal to GDB, and pray for the best. */
2108 lwp
->collecting_fast_tracepoint
= 0;
2111 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2112 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2115 struct regcache
*regcache
;
2117 /* The si_addr on a few signals references the address
2118 of the faulting instruction. Adjust that as
2120 if ((WSTOPSIG (*wstat
) == SIGILL
2121 || WSTOPSIG (*wstat
) == SIGFPE
2122 || WSTOPSIG (*wstat
) == SIGBUS
2123 || WSTOPSIG (*wstat
) == SIGSEGV
)
2124 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2125 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2126 /* Final check just to make sure we don't clobber
2127 the siginfo of non-kernel-sent signals. */
2128 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2130 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2131 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2132 (PTRACE_TYPE_ARG3
) 0, &info
);
2135 regcache
= get_thread_regcache (current_thread
, 1);
2136 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2137 lwp
->stop_pc
= status
.tpoint_addr
;
2139 /* Cancel any fast tracepoint lock this thread was
2141 force_unlock_trace_buffer ();
2144 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2147 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2148 "stopping all threads momentarily.\n");
2150 stop_all_lwps (1, lwp
);
2152 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2153 lwp
->exit_jump_pad_bkpt
= NULL
;
2155 unstop_all_lwps (1, lwp
);
2157 gdb_assert (lwp
->suspended
>= 0);
2163 debug_printf ("Checking whether LWP %ld needs to move out of the "
2165 lwpid_of (current_thread
));
2167 current_thread
= saved_thread
;
2171 /* Enqueue one signal in the "signals to report later when out of the
2175 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2177 struct pending_signals
*p_sig
;
2178 struct thread_info
*thread
= get_lwp_thread (lwp
);
2181 debug_printf ("Deferring signal %d for LWP %ld.\n",
2182 WSTOPSIG (*wstat
), lwpid_of (thread
));
2186 struct pending_signals
*sig
;
2188 for (sig
= lwp
->pending_signals_to_report
;
2191 debug_printf (" Already queued %d\n",
2194 debug_printf (" (no more currently queued signals)\n");
2197 /* Don't enqueue non-RT signals if they are already in the deferred
2198 queue. (SIGSTOP being the easiest signal to see ending up here
2200 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2202 struct pending_signals
*sig
;
2204 for (sig
= lwp
->pending_signals_to_report
;
2208 if (sig
->signal
== WSTOPSIG (*wstat
))
2211 debug_printf ("Not requeuing already queued non-RT signal %d"
2220 p_sig
= XCNEW (struct pending_signals
);
2221 p_sig
->prev
= lwp
->pending_signals_to_report
;
2222 p_sig
->signal
= WSTOPSIG (*wstat
);
2224 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2227 lwp
->pending_signals_to_report
= p_sig
;
2230 /* Dequeue one signal from the "signals to report later when out of
2231 the jump pad" list. */
2234 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2236 struct thread_info
*thread
= get_lwp_thread (lwp
);
2238 if (lwp
->pending_signals_to_report
!= NULL
)
2240 struct pending_signals
**p_sig
;
2242 p_sig
= &lwp
->pending_signals_to_report
;
2243 while ((*p_sig
)->prev
!= NULL
)
2244 p_sig
= &(*p_sig
)->prev
;
2246 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2247 if ((*p_sig
)->info
.si_signo
!= 0)
2248 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2254 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2255 WSTOPSIG (*wstat
), lwpid_of (thread
));
2259 struct pending_signals
*sig
;
2261 for (sig
= lwp
->pending_signals_to_report
;
2264 debug_printf (" Still queued %d\n",
2267 debug_printf (" (no more queued signals)\n");
2276 /* Fetch the possibly triggered data watchpoint info and store it in
2279 On some archs, like x86, that use debug registers to set
2280 watchpoints, it's possible that the way to know which watched
2281 address trapped, is to check the register that is used to select
2282 which address to watch. Problem is, between setting the watchpoint
2283 and reading back which data address trapped, the user may change
2284 the set of watchpoints, and, as a consequence, GDB changes the
2285 debug registers in the inferior. To avoid reading back a stale
2286 stopped-data-address when that happens, we cache in LP the fact
2287 that a watchpoint trapped, and the corresponding data address, as
2288 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2289 registers meanwhile, we have the cached data we can rely on. */
2292 check_stopped_by_watchpoint (struct lwp_info
*child
)
2294 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2296 struct thread_info
*saved_thread
;
2298 saved_thread
= current_thread
;
2299 current_thread
= get_lwp_thread (child
);
2301 if (the_low_target
.stopped_by_watchpoint ())
2303 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2305 if (the_low_target
.stopped_data_address
!= NULL
)
2306 child
->stopped_data_address
2307 = the_low_target
.stopped_data_address ();
2309 child
->stopped_data_address
= 0;
2312 current_thread
= saved_thread
;
2315 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2318 /* Return the ptrace options that we want to try to enable. */
2321 linux_low_ptrace_options (int attached
)
2326 options
|= PTRACE_O_EXITKILL
;
2328 if (report_fork_events
)
2329 options
|= PTRACE_O_TRACEFORK
;
2331 if (report_vfork_events
)
2332 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2334 if (report_exec_events
)
2335 options
|= PTRACE_O_TRACEEXEC
;
2337 options
|= PTRACE_O_TRACESYSGOOD
;
2342 /* Do low-level handling of the event, and check if we should go on
2343 and pass it to caller code. Return the affected lwp if we are, or
2346 static struct lwp_info
*
2347 linux_low_filter_event (int lwpid
, int wstat
)
2349 struct lwp_info
*child
;
2350 struct thread_info
*thread
;
2351 int have_stop_pc
= 0;
2353 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2355 /* Check for stop events reported by a process we didn't already
2356 know about - anything not already in our LWP list.
2358 If we're expecting to receive stopped processes after
2359 fork, vfork, and clone events, then we'll just add the
2360 new one to our list and go back to waiting for the event
2361 to be reported - the stopped process might be returned
2362 from waitpid before or after the event is.
2364 But note the case of a non-leader thread exec'ing after the
2365 leader having exited, and gone from our lists (because
2366 check_zombie_leaders deleted it). The non-leader thread
2367 changes its tid to the tgid. */
2369 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2370 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2374 /* A multi-thread exec after we had seen the leader exiting. */
2377 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2378 "after exec.\n", lwpid
);
2381 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2382 child
= add_lwp (child_ptid
);
2384 current_thread
= child
->thread
;
2387 /* If we didn't find a process, one of two things presumably happened:
2388 - A process we started and then detached from has exited. Ignore it.
2389 - A process we are controlling has forked and the new child's stop
2390 was reported to us by the kernel. Save its PID. */
2391 if (child
== NULL
&& WIFSTOPPED (wstat
))
2393 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2396 else if (child
== NULL
)
2399 thread
= get_lwp_thread (child
);
2403 child
->last_status
= wstat
;
2405 /* Check if the thread has exited. */
2406 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2409 debug_printf ("LLFE: %d exited.\n", lwpid
);
2411 if (finish_step_over (child
))
2413 /* Unsuspend all other LWPs, and set them back running again. */
2414 unsuspend_all_lwps (child
);
2417 /* If there is at least one more LWP, then the exit signal was
2418 not the end of the debugged application and should be
2419 ignored, unless GDB wants to hear about thread exits. */
2420 if (report_thread_events
2421 || last_thread_of_process_p (pid_of (thread
)))
2423 /* Since events are serialized to GDB core, and we can't
2424 report this one right now. Leave the status pending for
2425 the next time we're able to report it. */
2426 mark_lwp_dead (child
, wstat
);
2436 gdb_assert (WIFSTOPPED (wstat
));
2438 if (WIFSTOPPED (wstat
))
2440 struct process_info
*proc
;
2442 /* Architecture-specific setup after inferior is running. */
2443 proc
= find_process_pid (pid_of (thread
));
2444 if (proc
->tdesc
== NULL
)
2448 /* This needs to happen after we have attached to the
2449 inferior and it is stopped for the first time, but
2450 before we access any inferior registers. */
2451 linux_arch_setup_thread (thread
);
2455 /* The process is started, but GDBserver will do
2456 architecture-specific setup after the program stops at
2457 the first instruction. */
2458 child
->status_pending_p
= 1;
2459 child
->status_pending
= wstat
;
2465 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2467 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2468 int options
= linux_low_ptrace_options (proc
->attached
);
2470 linux_enable_event_reporting (lwpid
, options
);
2471 child
->must_set_ptrace_flags
= 0;
2474 /* Always update syscall_state, even if it will be filtered later. */
2475 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2477 child
->syscall_state
2478 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2479 ? TARGET_WAITKIND_SYSCALL_RETURN
2480 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2484 /* Almost all other ptrace-stops are known to be outside of system
2485 calls, with further exceptions in handle_extended_wait. */
2486 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2489 /* Be careful to not overwrite stop_pc until save_stop_reason is
2491 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2492 && linux_is_extended_waitstatus (wstat
))
2494 child
->stop_pc
= get_pc (child
);
2495 if (handle_extended_wait (&child
, wstat
))
2497 /* The event has been handled, so just return without
2503 if (linux_wstatus_maybe_breakpoint (wstat
))
2505 if (save_stop_reason (child
))
2510 child
->stop_pc
= get_pc (child
);
2512 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2513 && child
->stop_expected
)
2516 debug_printf ("Expected stop.\n");
2517 child
->stop_expected
= 0;
2519 if (thread
->last_resume_kind
== resume_stop
)
2521 /* We want to report the stop to the core. Treat the
2522 SIGSTOP as a normal event. */
2524 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2525 target_pid_to_str (ptid_of (thread
)));
2527 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2529 /* Stopping threads. We don't want this SIGSTOP to end up
2532 debug_printf ("LLW: SIGSTOP caught for %s "
2533 "while stopping threads.\n",
2534 target_pid_to_str (ptid_of (thread
)));
2539 /* This is a delayed SIGSTOP. Filter out the event. */
2541 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2542 child
->stepping
? "step" : "continue",
2543 target_pid_to_str (ptid_of (thread
)));
2545 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2550 child
->status_pending_p
= 1;
2551 child
->status_pending
= wstat
;
2555 /* Return true if THREAD is doing hardware single step. */
2558 maybe_hw_step (struct thread_info
*thread
)
2560 if (can_hardware_single_step ())
2564 struct process_info
*proc
= get_thread_process (thread
);
2566 /* GDBserver must insert reinsert breakpoint for software
2568 gdb_assert (has_reinsert_breakpoints (proc
));
2573 /* Resume LWPs that are currently stopped without any pending status
2574 to report, but are resumed from the core's perspective. */
2577 resume_stopped_resumed_lwps (struct inferior_list_entry
*entry
)
2579 struct thread_info
*thread
= (struct thread_info
*) entry
;
2580 struct lwp_info
*lp
= get_thread_lwp (thread
);
2584 && !lp
->status_pending_p
2585 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2587 int step
= thread
->last_resume_kind
== resume_step
;
2590 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2591 target_pid_to_str (ptid_of (thread
)),
2592 paddress (lp
->stop_pc
),
2595 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2599 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2600 match FILTER_PTID (leaving others pending). The PTIDs can be:
2601 minus_one_ptid, to specify any child; a pid PTID, specifying all
2602 lwps of a thread group; or a PTID representing a single lwp. Store
2603 the stop status through the status pointer WSTAT. OPTIONS is
2604 passed to the waitpid call. Return 0 if no event was found and
2605 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2606 was found. Return the PID of the stopped child otherwise. */
2609 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2610 int *wstatp
, int options
)
2612 struct thread_info
*event_thread
;
2613 struct lwp_info
*event_child
, *requested_child
;
2614 sigset_t block_mask
, prev_mask
;
2617 /* N.B. event_thread points to the thread_info struct that contains
2618 event_child. Keep them in sync. */
2619 event_thread
= NULL
;
2621 requested_child
= NULL
;
2623 /* Check for a lwp with a pending status. */
2625 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2627 event_thread
= (struct thread_info
*)
2628 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2629 if (event_thread
!= NULL
)
2630 event_child
= get_thread_lwp (event_thread
);
2631 if (debug_threads
&& event_thread
)
2632 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2634 else if (!ptid_equal (filter_ptid
, null_ptid
))
2636 requested_child
= find_lwp_pid (filter_ptid
);
2638 if (stopping_threads
== NOT_STOPPING_THREADS
2639 && requested_child
->status_pending_p
2640 && requested_child
->collecting_fast_tracepoint
)
2642 enqueue_one_deferred_signal (requested_child
,
2643 &requested_child
->status_pending
);
2644 requested_child
->status_pending_p
= 0;
2645 requested_child
->status_pending
= 0;
2646 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2649 if (requested_child
->suspended
2650 && requested_child
->status_pending_p
)
2652 internal_error (__FILE__
, __LINE__
,
2653 "requesting an event out of a"
2654 " suspended child?");
2657 if (requested_child
->status_pending_p
)
2659 event_child
= requested_child
;
2660 event_thread
= get_lwp_thread (event_child
);
2664 if (event_child
!= NULL
)
2667 debug_printf ("Got an event from pending child %ld (%04x)\n",
2668 lwpid_of (event_thread
), event_child
->status_pending
);
2669 *wstatp
= event_child
->status_pending
;
2670 event_child
->status_pending_p
= 0;
2671 event_child
->status_pending
= 0;
2672 current_thread
= event_thread
;
2673 return lwpid_of (event_thread
);
2676 /* But if we don't find a pending event, we'll have to wait.
2678 We only enter this loop if no process has a pending wait status.
2679 Thus any action taken in response to a wait status inside this
2680 loop is responding as soon as we detect the status, not after any
2683 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2684 all signals while here. */
2685 sigfillset (&block_mask
);
2686 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2688 /* Always pull all events out of the kernel. We'll randomly select
2689 an event LWP out of all that have events, to prevent
2691 while (event_child
== NULL
)
2695 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2698 - If the thread group leader exits while other threads in the
2699 thread group still exist, waitpid(TGID, ...) hangs. That
2700 waitpid won't return an exit status until the other threads
2701 in the group are reaped.
2703 - When a non-leader thread execs, that thread just vanishes
2704 without reporting an exit (so we'd hang if we waited for it
2705 explicitly in that case). The exec event is reported to
2708 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2711 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2712 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2718 debug_printf ("LLW: waitpid %ld received %s\n",
2719 (long) ret
, status_to_str (*wstatp
));
2722 /* Filter all events. IOW, leave all events pending. We'll
2723 randomly select an event LWP out of all that have events
2725 linux_low_filter_event (ret
, *wstatp
);
2726 /* Retry until nothing comes out of waitpid. A single
2727 SIGCHLD can indicate more than one child stopped. */
2731 /* Now that we've pulled all events out of the kernel, resume
2732 LWPs that don't have an interesting event to report. */
2733 if (stopping_threads
== NOT_STOPPING_THREADS
)
2734 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2736 /* ... and find an LWP with a status to report to the core, if
2738 event_thread
= (struct thread_info
*)
2739 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2740 if (event_thread
!= NULL
)
2742 event_child
= get_thread_lwp (event_thread
);
2743 *wstatp
= event_child
->status_pending
;
2744 event_child
->status_pending_p
= 0;
2745 event_child
->status_pending
= 0;
2749 /* Check for zombie thread group leaders. Those can't be reaped
2750 until all other threads in the thread group are. */
2751 check_zombie_leaders ();
2753 /* If there are no resumed children left in the set of LWPs we
2754 want to wait for, bail. We can't just block in
2755 waitpid/sigsuspend, because lwps might have been left stopped
2756 in trace-stop state, and we'd be stuck forever waiting for
2757 their status to change (which would only happen if we resumed
2758 them). Even if WNOHANG is set, this return code is preferred
2759 over 0 (below), as it is more detailed. */
2760 if ((find_inferior (&all_threads
,
2761 not_stopped_callback
,
2762 &wait_ptid
) == NULL
))
2765 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2766 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2770 /* No interesting event to report to the caller. */
2771 if ((options
& WNOHANG
))
2774 debug_printf ("WNOHANG set, no event found\n");
2776 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2780 /* Block until we get an event reported with SIGCHLD. */
2782 debug_printf ("sigsuspend'ing\n");
2784 sigsuspend (&prev_mask
);
2785 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2789 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2791 current_thread
= event_thread
;
2793 return lwpid_of (event_thread
);
2796 /* Wait for an event from child(ren) PTID. PTIDs can be:
2797 minus_one_ptid, to specify any child; a pid PTID, specifying all
2798 lwps of a thread group; or a PTID representing a single lwp. Store
2799 the stop status through the status pointer WSTAT. OPTIONS is
2800 passed to the waitpid call. Return 0 if no event was found and
2801 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2802 was found. Return the PID of the stopped child otherwise. */
2805 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2807 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2810 /* Count the LWP's that have had events. */
2813 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2815 struct thread_info
*thread
= (struct thread_info
*) entry
;
2816 struct lwp_info
*lp
= get_thread_lwp (thread
);
2817 int *count
= (int *) data
;
2819 gdb_assert (count
!= NULL
);
2821 /* Count only resumed LWPs that have an event pending. */
2822 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2823 && lp
->status_pending_p
)
2829 /* Select the LWP (if any) that is currently being single-stepped. */
2832 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2834 struct thread_info
*thread
= (struct thread_info
*) entry
;
2835 struct lwp_info
*lp
= get_thread_lwp (thread
);
2837 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2838 && thread
->last_resume_kind
== resume_step
2839 && lp
->status_pending_p
)
2845 /* Select the Nth LWP that has had an event. */
2848 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2850 struct thread_info
*thread
= (struct thread_info
*) entry
;
2851 struct lwp_info
*lp
= get_thread_lwp (thread
);
2852 int *selector
= (int *) data
;
2854 gdb_assert (selector
!= NULL
);
2856 /* Select only resumed LWPs that have an event pending. */
2857 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2858 && lp
->status_pending_p
)
2859 if ((*selector
)-- == 0)
2865 /* Select one LWP out of those that have events pending. */
2868 select_event_lwp (struct lwp_info
**orig_lp
)
2871 int random_selector
;
2872 struct thread_info
*event_thread
= NULL
;
2874 /* In all-stop, give preference to the LWP that is being
2875 single-stepped. There will be at most one, and it's the LWP that
2876 the core is most interested in. If we didn't do this, then we'd
2877 have to handle pending step SIGTRAPs somehow in case the core
2878 later continues the previously-stepped thread, otherwise we'd
2879 report the pending SIGTRAP, and the core, not having stepped the
2880 thread, wouldn't understand what the trap was for, and therefore
2881 would report it to the user as a random signal. */
2885 = (struct thread_info
*) find_inferior (&all_threads
,
2886 select_singlestep_lwp_callback
,
2888 if (event_thread
!= NULL
)
2891 debug_printf ("SEL: Select single-step %s\n",
2892 target_pid_to_str (ptid_of (event_thread
)));
2895 if (event_thread
== NULL
)
2897 /* No single-stepping LWP. Select one at random, out of those
2898 which have had events. */
2900 /* First see how many events we have. */
2901 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2902 gdb_assert (num_events
> 0);
2904 /* Now randomly pick a LWP out of those that have had
2906 random_selector
= (int)
2907 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2909 if (debug_threads
&& num_events
> 1)
2910 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2911 num_events
, random_selector
);
2914 = (struct thread_info
*) find_inferior (&all_threads
,
2915 select_event_lwp_callback
,
2919 if (event_thread
!= NULL
)
2921 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2923 /* Switch the event LWP. */
2924 *orig_lp
= event_lp
;
2928 /* Decrement the suspend count of an LWP. */
2931 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2933 struct thread_info
*thread
= (struct thread_info
*) entry
;
2934 struct lwp_info
*lwp
= get_thread_lwp (thread
);
2936 /* Ignore EXCEPT. */
2940 lwp_suspended_decr (lwp
);
2944 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2948 unsuspend_all_lwps (struct lwp_info
*except
)
2950 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
2953 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
2954 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
2956 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
2957 static ptid_t
linux_wait_1 (ptid_t ptid
,
2958 struct target_waitstatus
*ourstatus
,
2959 int target_options
);
2961 /* Stabilize threads (move out of jump pads).
2963 If a thread is midway collecting a fast tracepoint, we need to
2964 finish the collection and move it out of the jump pad before
2965 reporting the signal.
2967 This avoids recursion while collecting (when a signal arrives
2968 midway, and the signal handler itself collects), which would trash
2969 the trace buffer. In case the user set a breakpoint in a signal
2970 handler, this avoids the backtrace showing the jump pad, etc..
2971 Most importantly, there are certain things we can't do safely if
2972 threads are stopped in a jump pad (or in its callee's). For
2975 - starting a new trace run. A thread still collecting the
2976 previous run, could trash the trace buffer when resumed. The trace
2977 buffer control structures would have been reset but the thread had
2978 no way to tell. The thread could even midway memcpy'ing to the
2979 buffer, which would mean that when resumed, it would clobber the
2980 trace buffer that had been set for a new run.
2982 - we can't rewrite/reuse the jump pads for new tracepoints
2983 safely. Say you do tstart while a thread is stopped midway while
2984 collecting. When the thread is later resumed, it finishes the
2985 collection, and returns to the jump pad, to execute the original
2986 instruction that was under the tracepoint jump at the time the
2987 older run had been started. If the jump pad had been rewritten
2988 since for something else in the new run, the thread would now
2989 execute the wrong / random instructions. */
2992 linux_stabilize_threads (void)
2994 struct thread_info
*saved_thread
;
2995 struct thread_info
*thread_stuck
;
2998 = (struct thread_info
*) find_inferior (&all_threads
,
2999 stuck_in_jump_pad_callback
,
3001 if (thread_stuck
!= NULL
)
3004 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
3005 lwpid_of (thread_stuck
));
3009 saved_thread
= current_thread
;
3011 stabilizing_threads
= 1;
3014 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
3016 /* Loop until all are stopped out of the jump pads. */
3017 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
3019 struct target_waitstatus ourstatus
;
3020 struct lwp_info
*lwp
;
3023 /* Note that we go through the full wait even loop. While
3024 moving threads out of jump pad, we need to be able to step
3025 over internal breakpoints and such. */
3026 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
3028 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
3030 lwp
= get_thread_lwp (current_thread
);
3033 lwp_suspended_inc (lwp
);
3035 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3036 || current_thread
->last_resume_kind
== resume_stop
)
3038 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3039 enqueue_one_deferred_signal (lwp
, &wstat
);
3044 unsuspend_all_lwps (NULL
);
3046 stabilizing_threads
= 0;
3048 current_thread
= saved_thread
;
3053 = (struct thread_info
*) find_inferior (&all_threads
,
3054 stuck_in_jump_pad_callback
,
3056 if (thread_stuck
!= NULL
)
3057 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3058 lwpid_of (thread_stuck
));
3062 /* Convenience function that is called when the kernel reports an
3063 event that is not passed out to GDB. */
3066 ignore_event (struct target_waitstatus
*ourstatus
)
3068 /* If we got an event, there may still be others, as a single
3069 SIGCHLD can indicate more than one child stopped. This forces
3070 another target_wait call. */
3073 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3077 /* Convenience function that is called when the kernel reports an exit
3078 event. This decides whether to report the event to GDB as a
3079 process exit event, a thread exit event, or to suppress the
3083 filter_exit_event (struct lwp_info
*event_child
,
3084 struct target_waitstatus
*ourstatus
)
3086 struct thread_info
*thread
= get_lwp_thread (event_child
);
3087 ptid_t ptid
= ptid_of (thread
);
3089 if (!last_thread_of_process_p (pid_of (thread
)))
3091 if (report_thread_events
)
3092 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3094 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3096 delete_lwp (event_child
);
3101 /* Returns 1 if GDB is interested in any event_child syscalls. */
3104 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3106 struct thread_info
*thread
= get_lwp_thread (event_child
);
3107 struct process_info
*proc
= get_thread_process (thread
);
3109 return !VEC_empty (int, proc
->syscalls_to_catch
);
3112 /* Returns 1 if GDB is interested in the event_child syscall.
3113 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3116 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3120 struct thread_info
*thread
= get_lwp_thread (event_child
);
3121 struct process_info
*proc
= get_thread_process (thread
);
3123 if (VEC_empty (int, proc
->syscalls_to_catch
))
3126 if (VEC_index (int, proc
->syscalls_to_catch
, 0) == ANY_SYSCALL
)
3129 get_syscall_trapinfo (event_child
, &sysno
, &sysret
);
3131 VEC_iterate (int, proc
->syscalls_to_catch
, i
, iter
);
3139 /* Wait for process, returns status. */
3142 linux_wait_1 (ptid_t ptid
,
3143 struct target_waitstatus
*ourstatus
, int target_options
)
3146 struct lwp_info
*event_child
;
3149 int step_over_finished
;
3150 int bp_explains_trap
;
3151 int maybe_internal_trap
;
3160 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3163 /* Translate generic target options into linux options. */
3165 if (target_options
& TARGET_WNOHANG
)
3168 bp_explains_trap
= 0;
3171 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3173 /* Find a resumed LWP, if any. */
3174 if (find_inferior (&all_threads
,
3175 status_pending_p_callback
,
3176 &minus_one_ptid
) != NULL
)
3178 else if ((find_inferior (&all_threads
,
3179 not_stopped_callback
,
3180 &minus_one_ptid
) != NULL
))
3185 if (ptid_equal (step_over_bkpt
, null_ptid
))
3186 pid
= linux_wait_for_event (ptid
, &w
, options
);
3190 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3191 target_pid_to_str (step_over_bkpt
));
3192 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3195 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3197 gdb_assert (target_options
& TARGET_WNOHANG
);
3201 debug_printf ("linux_wait_1 ret = null_ptid, "
3202 "TARGET_WAITKIND_IGNORE\n");
3206 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3213 debug_printf ("linux_wait_1 ret = null_ptid, "
3214 "TARGET_WAITKIND_NO_RESUMED\n");
3218 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3222 event_child
= get_thread_lwp (current_thread
);
3224 /* linux_wait_for_event only returns an exit status for the last
3225 child of a process. Report it. */
3226 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3230 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3231 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3235 debug_printf ("linux_wait_1 ret = %s, exited with "
3237 target_pid_to_str (ptid_of (current_thread
)),
3244 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3245 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3249 debug_printf ("linux_wait_1 ret = %s, terminated with "
3251 target_pid_to_str (ptid_of (current_thread
)),
3257 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3258 return filter_exit_event (event_child
, ourstatus
);
3260 return ptid_of (current_thread
);
3263 /* If step-over executes a breakpoint instruction, in the case of a
3264 hardware single step it means a gdb/gdbserver breakpoint had been
3265 planted on top of a permanent breakpoint, in the case of a software
3266 single step it may just mean that gdbserver hit the reinsert breakpoint.
3267 The PC has been adjusted by save_stop_reason to point at
3268 the breakpoint address.
3269 So in the case of the hardware single step advance the PC manually
3270 past the breakpoint and in the case of software single step advance only
3271 if it's not the reinsert_breakpoint we are hitting.
3272 This avoids that a program would keep trapping a permanent breakpoint
3274 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3275 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3276 && (event_child
->stepping
3277 || !reinsert_breakpoint_inserted_here (event_child
->stop_pc
)))
3279 int increment_pc
= 0;
3280 int breakpoint_kind
= 0;
3281 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3284 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3285 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3289 debug_printf ("step-over for %s executed software breakpoint\n",
3290 target_pid_to_str (ptid_of (current_thread
)));
3293 if (increment_pc
!= 0)
3295 struct regcache
*regcache
3296 = get_thread_regcache (current_thread
, 1);
3298 event_child
->stop_pc
+= increment_pc
;
3299 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3301 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3302 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3306 /* If this event was not handled before, and is not a SIGTRAP, we
3307 report it. SIGILL and SIGSEGV are also treated as traps in case
3308 a breakpoint is inserted at the current PC. If this target does
3309 not support internal breakpoints at all, we also report the
3310 SIGTRAP without further processing; it's of no concern to us. */
3312 = (supports_breakpoints ()
3313 && (WSTOPSIG (w
) == SIGTRAP
3314 || ((WSTOPSIG (w
) == SIGILL
3315 || WSTOPSIG (w
) == SIGSEGV
)
3316 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3318 if (maybe_internal_trap
)
3320 /* Handle anything that requires bookkeeping before deciding to
3321 report the event or continue waiting. */
3323 /* First check if we can explain the SIGTRAP with an internal
3324 breakpoint, or if we should possibly report the event to GDB.
3325 Do this before anything that may remove or insert a
3327 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3329 /* We have a SIGTRAP, possibly a step-over dance has just
3330 finished. If so, tweak the state machine accordingly,
3331 reinsert breakpoints and delete any reinsert (software
3332 single-step) breakpoints. */
3333 step_over_finished
= finish_step_over (event_child
);
3335 /* Now invoke the callbacks of any internal breakpoints there. */
3336 check_breakpoints (event_child
->stop_pc
);
3338 /* Handle tracepoint data collecting. This may overflow the
3339 trace buffer, and cause a tracing stop, removing
3341 trace_event
= handle_tracepoints (event_child
);
3343 if (bp_explains_trap
)
3346 debug_printf ("Hit a gdbserver breakpoint.\n");
3351 /* We have some other signal, possibly a step-over dance was in
3352 progress, and it should be cancelled too. */
3353 step_over_finished
= finish_step_over (event_child
);
3356 /* We have all the data we need. Either report the event to GDB, or
3357 resume threads and keep waiting for more. */
3359 /* If we're collecting a fast tracepoint, finish the collection and
3360 move out of the jump pad before delivering a signal. See
3361 linux_stabilize_threads. */
3364 && WSTOPSIG (w
) != SIGTRAP
3365 && supports_fast_tracepoints ()
3366 && agent_loaded_p ())
3369 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3370 "to defer or adjust it.\n",
3371 WSTOPSIG (w
), lwpid_of (current_thread
));
3373 /* Allow debugging the jump pad itself. */
3374 if (current_thread
->last_resume_kind
!= resume_step
3375 && maybe_move_out_of_jump_pad (event_child
, &w
))
3377 enqueue_one_deferred_signal (event_child
, &w
);
3380 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3381 WSTOPSIG (w
), lwpid_of (current_thread
));
3383 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3385 return ignore_event (ourstatus
);
3389 if (event_child
->collecting_fast_tracepoint
)
3392 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3393 "Check if we're already there.\n",
3394 lwpid_of (current_thread
),
3395 event_child
->collecting_fast_tracepoint
);
3399 event_child
->collecting_fast_tracepoint
3400 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3402 if (event_child
->collecting_fast_tracepoint
!= 1)
3404 /* No longer need this breakpoint. */
3405 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3408 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3409 "stopping all threads momentarily.\n");
3411 /* Other running threads could hit this breakpoint.
3412 We don't handle moribund locations like GDB does,
3413 instead we always pause all threads when removing
3414 breakpoints, so that any step-over or
3415 decr_pc_after_break adjustment is always taken
3416 care of while the breakpoint is still
3418 stop_all_lwps (1, event_child
);
3420 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3421 event_child
->exit_jump_pad_bkpt
= NULL
;
3423 unstop_all_lwps (1, event_child
);
3425 gdb_assert (event_child
->suspended
>= 0);
3429 if (event_child
->collecting_fast_tracepoint
== 0)
3432 debug_printf ("fast tracepoint finished "
3433 "collecting successfully.\n");
3435 /* We may have a deferred signal to report. */
3436 if (dequeue_one_deferred_signal (event_child
, &w
))
3439 debug_printf ("dequeued one signal.\n");
3444 debug_printf ("no deferred signals.\n");
3446 if (stabilizing_threads
)
3448 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3449 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3453 debug_printf ("linux_wait_1 ret = %s, stopped "
3454 "while stabilizing threads\n",
3455 target_pid_to_str (ptid_of (current_thread
)));
3459 return ptid_of (current_thread
);
3465 /* Check whether GDB would be interested in this event. */
3467 /* Check if GDB is interested in this syscall. */
3469 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3470 && !gdb_catch_this_syscall_p (event_child
))
3474 debug_printf ("Ignored syscall for LWP %ld.\n",
3475 lwpid_of (current_thread
));
3478 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3480 return ignore_event (ourstatus
);
3483 /* If GDB is not interested in this signal, don't stop other
3484 threads, and don't report it to GDB. Just resume the inferior
3485 right away. We do this for threading-related signals as well as
3486 any that GDB specifically requested we ignore. But never ignore
3487 SIGSTOP if we sent it ourselves, and do not ignore signals when
3488 stepping - they may require special handling to skip the signal
3489 handler. Also never ignore signals that could be caused by a
3492 && current_thread
->last_resume_kind
!= resume_step
3494 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3495 (current_process ()->priv
->thread_db
!= NULL
3496 && (WSTOPSIG (w
) == __SIGRTMIN
3497 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3500 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3501 && !(WSTOPSIG (w
) == SIGSTOP
3502 && current_thread
->last_resume_kind
== resume_stop
)
3503 && !linux_wstatus_maybe_breakpoint (w
))))
3505 siginfo_t info
, *info_p
;
3508 debug_printf ("Ignored signal %d for LWP %ld.\n",
3509 WSTOPSIG (w
), lwpid_of (current_thread
));
3511 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3512 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3517 if (step_over_finished
)
3519 /* We cancelled this thread's step-over above. We still
3520 need to unsuspend all other LWPs, and set them back
3521 running again while the signal handler runs. */
3522 unsuspend_all_lwps (event_child
);
3524 /* Enqueue the pending signal info so that proceed_all_lwps
3526 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3528 proceed_all_lwps ();
3532 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3533 WSTOPSIG (w
), info_p
);
3535 return ignore_event (ourstatus
);
3538 /* Note that all addresses are always "out of the step range" when
3539 there's no range to begin with. */
3540 in_step_range
= lwp_in_step_range (event_child
);
3542 /* If GDB wanted this thread to single step, and the thread is out
3543 of the step range, we always want to report the SIGTRAP, and let
3544 GDB handle it. Watchpoints should always be reported. So should
3545 signals we can't explain. A SIGTRAP we can't explain could be a
3546 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3547 do, we're be able to handle GDB breakpoints on top of internal
3548 breakpoints, by handling the internal breakpoint and still
3549 reporting the event to GDB. If we don't, we're out of luck, GDB
3550 won't see the breakpoint hit. If we see a single-step event but
3551 the thread should be continuing, don't pass the trap to gdb.
3552 That indicates that we had previously finished a single-step but
3553 left the single-step pending -- see
3554 complete_ongoing_step_over. */
3555 report_to_gdb
= (!maybe_internal_trap
3556 || (current_thread
->last_resume_kind
== resume_step
3558 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3560 && !bp_explains_trap
3562 && !step_over_finished
3563 && !(current_thread
->last_resume_kind
== resume_continue
3564 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3565 || (gdb_breakpoint_here (event_child
->stop_pc
)
3566 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3567 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3568 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3570 run_breakpoint_commands (event_child
->stop_pc
);
3572 /* We found no reason GDB would want us to stop. We either hit one
3573 of our own breakpoints, or finished an internal step GDB
3574 shouldn't know about. */
3579 if (bp_explains_trap
)
3580 debug_printf ("Hit a gdbserver breakpoint.\n");
3581 if (step_over_finished
)
3582 debug_printf ("Step-over finished.\n");
3584 debug_printf ("Tracepoint event.\n");
3585 if (lwp_in_step_range (event_child
))
3586 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3587 paddress (event_child
->stop_pc
),
3588 paddress (event_child
->step_range_start
),
3589 paddress (event_child
->step_range_end
));
3592 /* We're not reporting this breakpoint to GDB, so apply the
3593 decr_pc_after_break adjustment to the inferior's regcache
3596 if (the_low_target
.set_pc
!= NULL
)
3598 struct regcache
*regcache
3599 = get_thread_regcache (current_thread
, 1);
3600 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3603 /* We may have finished stepping over a breakpoint. If so,
3604 we've stopped and suspended all LWPs momentarily except the
3605 stepping one. This is where we resume them all again. We're
3606 going to keep waiting, so use proceed, which handles stepping
3607 over the next breakpoint. */
3609 debug_printf ("proceeding all threads.\n");
3611 if (step_over_finished
)
3612 unsuspend_all_lwps (event_child
);
3614 proceed_all_lwps ();
3615 return ignore_event (ourstatus
);
3620 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3624 str
= target_waitstatus_to_string (&event_child
->waitstatus
);
3625 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3626 lwpid_of (get_lwp_thread (event_child
)), str
);
3629 if (current_thread
->last_resume_kind
== resume_step
)
3631 if (event_child
->step_range_start
== event_child
->step_range_end
)
3632 debug_printf ("GDB wanted to single-step, reporting event.\n");
3633 else if (!lwp_in_step_range (event_child
))
3634 debug_printf ("Out of step range, reporting event.\n");
3636 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3637 debug_printf ("Stopped by watchpoint.\n");
3638 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3639 debug_printf ("Stopped by GDB breakpoint.\n");
3641 debug_printf ("Hit a non-gdbserver trap event.\n");
3644 /* Alright, we're going to report a stop. */
3646 if (!stabilizing_threads
)
3648 /* In all-stop, stop all threads. */
3650 stop_all_lwps (0, NULL
);
3652 /* If we're not waiting for a specific LWP, choose an event LWP
3653 from among those that have had events. Giving equal priority
3654 to all LWPs that have had events helps prevent
3656 if (ptid_equal (ptid
, minus_one_ptid
))
3658 event_child
->status_pending_p
= 1;
3659 event_child
->status_pending
= w
;
3661 select_event_lwp (&event_child
);
3663 /* current_thread and event_child must stay in sync. */
3664 current_thread
= get_lwp_thread (event_child
);
3666 event_child
->status_pending_p
= 0;
3667 w
= event_child
->status_pending
;
3670 if (step_over_finished
)
3674 /* If we were doing a step-over, all other threads but
3675 the stepping one had been paused in start_step_over,
3676 with their suspend counts incremented. We don't want
3677 to do a full unstop/unpause, because we're in
3678 all-stop mode (so we want threads stopped), but we
3679 still need to unsuspend the other threads, to
3680 decrement their `suspended' count back. */
3681 unsuspend_all_lwps (event_child
);
3685 /* If we just finished a step-over, then all threads had
3686 been momentarily paused. In all-stop, that's fine,
3687 we want threads stopped by now anyway. In non-stop,
3688 we need to re-resume threads that GDB wanted to be
3690 unstop_all_lwps (1, event_child
);
3694 /* Stabilize threads (move out of jump pads). */
3696 stabilize_threads ();
3700 /* If we just finished a step-over, then all threads had been
3701 momentarily paused. In all-stop, that's fine, we want
3702 threads stopped by now anyway. In non-stop, we need to
3703 re-resume threads that GDB wanted to be running. */
3704 if (step_over_finished
)
3705 unstop_all_lwps (1, event_child
);
3708 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3710 /* If the reported event is an exit, fork, vfork or exec, let
3712 *ourstatus
= event_child
->waitstatus
;
3713 /* Clear the event lwp's waitstatus since we handled it already. */
3714 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3717 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3719 /* Now that we've selected our final event LWP, un-adjust its PC if
3720 it was a software breakpoint, and the client doesn't know we can
3721 adjust the breakpoint ourselves. */
3722 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3723 && !swbreak_feature
)
3725 int decr_pc
= the_low_target
.decr_pc_after_break
;
3729 struct regcache
*regcache
3730 = get_thread_regcache (current_thread
, 1);
3731 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3735 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3739 get_syscall_trapinfo (event_child
,
3740 &ourstatus
->value
.syscall_number
, &sysret
);
3741 ourstatus
->kind
= event_child
->syscall_state
;
3743 else if (current_thread
->last_resume_kind
== resume_stop
3744 && WSTOPSIG (w
) == SIGSTOP
)
3746 /* A thread that has been requested to stop by GDB with vCont;t,
3747 and it stopped cleanly, so report as SIG0. The use of
3748 SIGSTOP is an implementation detail. */
3749 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3751 else if (current_thread
->last_resume_kind
== resume_stop
3752 && WSTOPSIG (w
) != SIGSTOP
)
3754 /* A thread that has been requested to stop by GDB with vCont;t,
3755 but, it stopped for other reasons. */
3756 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3758 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3760 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3763 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3767 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3768 target_pid_to_str (ptid_of (current_thread
)),
3769 ourstatus
->kind
, ourstatus
->value
.sig
);
3773 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3774 return filter_exit_event (event_child
, ourstatus
);
3776 return ptid_of (current_thread
);
3779 /* Get rid of any pending event in the pipe. */
3781 async_file_flush (void)
3787 ret
= read (linux_event_pipe
[0], &buf
, 1);
3788 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3791 /* Put something in the pipe, so the event loop wakes up. */
3793 async_file_mark (void)
3797 async_file_flush ();
3800 ret
= write (linux_event_pipe
[1], "+", 1);
3801 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3803 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3804 be awakened anyway. */
3808 linux_wait (ptid_t ptid
,
3809 struct target_waitstatus
*ourstatus
, int target_options
)
3813 /* Flush the async file first. */
3814 if (target_is_async_p ())
3815 async_file_flush ();
3819 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3821 while ((target_options
& TARGET_WNOHANG
) == 0
3822 && ptid_equal (event_ptid
, null_ptid
)
3823 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3825 /* If at least one stop was reported, there may be more. A single
3826 SIGCHLD can signal more than one child stop. */
3827 if (target_is_async_p ()
3828 && (target_options
& TARGET_WNOHANG
) != 0
3829 && !ptid_equal (event_ptid
, null_ptid
))
3835 /* Send a signal to an LWP. */
3838 kill_lwp (unsigned long lwpid
, int signo
)
3843 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3844 if (errno
== ENOSYS
)
3846 /* If tkill fails, then we are not using nptl threads, a
3847 configuration we no longer support. */
3848 perror_with_name (("tkill"));
3854 linux_stop_lwp (struct lwp_info
*lwp
)
3860 send_sigstop (struct lwp_info
*lwp
)
3864 pid
= lwpid_of (get_lwp_thread (lwp
));
3866 /* If we already have a pending stop signal for this process, don't
3868 if (lwp
->stop_expected
)
3871 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3877 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3879 lwp
->stop_expected
= 1;
3880 kill_lwp (pid
, SIGSTOP
);
3884 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
3886 struct thread_info
*thread
= (struct thread_info
*) entry
;
3887 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3889 /* Ignore EXCEPT. */
3900 /* Increment the suspend count of an LWP, and stop it, if not stopped
3903 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
3906 struct thread_info
*thread
= (struct thread_info
*) entry
;
3907 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3909 /* Ignore EXCEPT. */
3913 lwp_suspended_inc (lwp
);
3915 return send_sigstop_callback (entry
, except
);
3919 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3921 /* Store the exit status for later. */
3922 lwp
->status_pending_p
= 1;
3923 lwp
->status_pending
= wstat
;
3925 /* Store in waitstatus as well, as there's nothing else to process
3927 if (WIFEXITED (wstat
))
3929 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
3930 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
3932 else if (WIFSIGNALED (wstat
))
3934 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
3935 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
3938 /* Prevent trying to stop it. */
3941 /* No further stops are expected from a dead lwp. */
3942 lwp
->stop_expected
= 0;
3945 /* Return true if LWP has exited already, and has a pending exit event
3946 to report to GDB. */
3949 lwp_is_marked_dead (struct lwp_info
*lwp
)
3951 return (lwp
->status_pending_p
3952 && (WIFEXITED (lwp
->status_pending
)
3953 || WIFSIGNALED (lwp
->status_pending
)));
3956 /* Wait for all children to stop for the SIGSTOPs we just queued. */
3959 wait_for_sigstop (void)
3961 struct thread_info
*saved_thread
;
3966 saved_thread
= current_thread
;
3967 if (saved_thread
!= NULL
)
3968 saved_tid
= saved_thread
->entry
.id
;
3970 saved_tid
= null_ptid
; /* avoid bogus unused warning */
3973 debug_printf ("wait_for_sigstop: pulling events\n");
3975 /* Passing NULL_PTID as filter indicates we want all events to be
3976 left pending. Eventually this returns when there are no
3977 unwaited-for children left. */
3978 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
3980 gdb_assert (ret
== -1);
3982 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
3983 current_thread
= saved_thread
;
3987 debug_printf ("Previously current thread died.\n");
3989 /* We can't change the current inferior behind GDB's back,
3990 otherwise, a subsequent command may apply to the wrong
3992 current_thread
= NULL
;
3996 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
3997 move it out, because we need to report the stop event to GDB. For
3998 example, if the user puts a breakpoint in the jump pad, it's
3999 because she wants to debug it. */
4002 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
4004 struct thread_info
*thread
= (struct thread_info
*) entry
;
4005 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4007 if (lwp
->suspended
!= 0)
4009 internal_error (__FILE__
, __LINE__
,
4010 "LWP %ld is suspended, suspended=%d\n",
4011 lwpid_of (thread
), lwp
->suspended
);
4013 gdb_assert (lwp
->stopped
);
4015 /* Allow debugging the jump pad, gdb_collect, etc.. */
4016 return (supports_fast_tracepoints ()
4017 && agent_loaded_p ()
4018 && (gdb_breakpoint_here (lwp
->stop_pc
)
4019 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4020 || thread
->last_resume_kind
== resume_step
)
4021 && linux_fast_tracepoint_collecting (lwp
, NULL
));
4025 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
4027 struct thread_info
*thread
= (struct thread_info
*) entry
;
4028 struct thread_info
*saved_thread
;
4029 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4032 if (lwp
->suspended
!= 0)
4034 internal_error (__FILE__
, __LINE__
,
4035 "LWP %ld is suspended, suspended=%d\n",
4036 lwpid_of (thread
), lwp
->suspended
);
4038 gdb_assert (lwp
->stopped
);
4040 /* For gdb_breakpoint_here. */
4041 saved_thread
= current_thread
;
4042 current_thread
= thread
;
4044 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4046 /* Allow debugging the jump pad, gdb_collect, etc. */
4047 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4048 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4049 && thread
->last_resume_kind
!= resume_step
4050 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4053 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4058 lwp
->status_pending_p
= 0;
4059 enqueue_one_deferred_signal (lwp
, wstat
);
4062 debug_printf ("Signal %d for LWP %ld deferred "
4064 WSTOPSIG (*wstat
), lwpid_of (thread
));
4067 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4070 lwp_suspended_inc (lwp
);
4072 current_thread
= saved_thread
;
4076 lwp_running (struct inferior_list_entry
*entry
, void *data
)
4078 struct thread_info
*thread
= (struct thread_info
*) entry
;
4079 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4081 if (lwp_is_marked_dead (lwp
))
4088 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4089 If SUSPEND, then also increase the suspend count of every LWP,
4093 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4095 /* Should not be called recursively. */
4096 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4101 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4102 suspend
? "stop-and-suspend" : "stop",
4104 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4108 stopping_threads
= (suspend
4109 ? STOPPING_AND_SUSPENDING_THREADS
4110 : STOPPING_THREADS
);
4113 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
4115 find_inferior (&all_threads
, send_sigstop_callback
, except
);
4116 wait_for_sigstop ();
4117 stopping_threads
= NOT_STOPPING_THREADS
;
4121 debug_printf ("stop_all_lwps done, setting stopping_threads "
4122 "back to !stopping\n");
4127 /* Enqueue one signal in the chain of signals which need to be
4128 delivered to this process on next resume. */
4131 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4133 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4135 p_sig
->prev
= lwp
->pending_signals
;
4136 p_sig
->signal
= signal
;
4138 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4140 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4141 lwp
->pending_signals
= p_sig
;
4144 /* Install breakpoints for software single stepping. */
4147 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4151 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4152 VEC (CORE_ADDR
) *next_pcs
= NULL
;
4153 struct cleanup
*old_chain
= make_cleanup (VEC_cleanup (CORE_ADDR
), &next_pcs
);
4155 next_pcs
= (*the_low_target
.get_next_pcs
) (regcache
);
4157 for (i
= 0; VEC_iterate (CORE_ADDR
, next_pcs
, i
, pc
); ++i
)
4158 set_reinsert_breakpoint (pc
);
4160 do_cleanups (old_chain
);
4163 /* Single step via hardware or software single step.
4164 Return 1 if hardware single stepping, 0 if software single stepping
4165 or can't single step. */
4168 single_step (struct lwp_info
* lwp
)
4172 if (can_hardware_single_step ())
4176 else if (can_software_single_step ())
4178 install_software_single_step_breakpoints (lwp
);
4184 debug_printf ("stepping is not implemented on this target");
4190 /* The signal can be delivered to the inferior if we are not trying to
4191 finish a fast tracepoint collect. Since signal can be delivered in
4192 the step-over, the program may go to signal handler and trap again
4193 after return from the signal handler. We can live with the spurious
4197 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4199 return !lwp
->collecting_fast_tracepoint
;
4202 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4203 SIGNAL is nonzero, give it that signal. */
4206 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4207 int step
, int signal
, siginfo_t
*info
)
4209 struct thread_info
*thread
= get_lwp_thread (lwp
);
4210 struct thread_info
*saved_thread
;
4211 int fast_tp_collecting
;
4213 struct process_info
*proc
= get_thread_process (thread
);
4215 /* Note that target description may not be initialised
4216 (proc->tdesc == NULL) at this point because the program hasn't
4217 stopped at the first instruction yet. It means GDBserver skips
4218 the extra traps from the wrapper program (see option --wrapper).
4219 Code in this function that requires register access should be
4220 guarded by proc->tdesc == NULL or something else. */
4222 if (lwp
->stopped
== 0)
4225 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4227 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
4229 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
4231 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4232 user used the "jump" command, or "set $pc = foo"). */
4233 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4235 /* Collecting 'while-stepping' actions doesn't make sense
4237 release_while_stepping_state_list (thread
);
4240 /* If we have pending signals or status, and a new signal, enqueue the
4241 signal. Also enqueue the signal if it can't be delivered to the
4242 inferior right now. */
4244 && (lwp
->status_pending_p
4245 || lwp
->pending_signals
!= NULL
4246 || !lwp_signal_can_be_delivered (lwp
)))
4248 enqueue_pending_signal (lwp
, signal
, info
);
4250 /* Postpone any pending signal. It was enqueued above. */
4254 if (lwp
->status_pending_p
)
4257 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4258 " has pending status\n",
4259 lwpid_of (thread
), step
? "step" : "continue",
4260 lwp
->stop_expected
? "expected" : "not expected");
4264 saved_thread
= current_thread
;
4265 current_thread
= thread
;
4267 /* This bit needs some thinking about. If we get a signal that
4268 we must report while a single-step reinsert is still pending,
4269 we often end up resuming the thread. It might be better to
4270 (ew) allow a stack of pending events; then we could be sure that
4271 the reinsert happened right away and not lose any signals.
4273 Making this stack would also shrink the window in which breakpoints are
4274 uninserted (see comment in linux_wait_for_lwp) but not enough for
4275 complete correctness, so it won't solve that problem. It may be
4276 worthwhile just to solve this one, however. */
4277 if (lwp
->bp_reinsert
!= 0)
4280 debug_printf (" pending reinsert at 0x%s\n",
4281 paddress (lwp
->bp_reinsert
));
4283 if (can_hardware_single_step ())
4285 if (fast_tp_collecting
== 0)
4288 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
4290 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
4295 step
= maybe_hw_step (thread
);
4299 /* If the thread isn't doing step-over, there shouldn't be any
4300 reinsert breakpoints. */
4301 gdb_assert (!has_reinsert_breakpoints (proc
));
4304 if (fast_tp_collecting
== 1)
4307 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4308 " (exit-jump-pad-bkpt)\n",
4311 else if (fast_tp_collecting
== 2)
4314 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4315 " single-stepping\n",
4318 if (can_hardware_single_step ())
4322 internal_error (__FILE__
, __LINE__
,
4323 "moving out of jump pad single-stepping"
4324 " not implemented on this target");
4328 /* If we have while-stepping actions in this thread set it stepping.
4329 If we have a signal to deliver, it may or may not be set to
4330 SIG_IGN, we don't know. Assume so, and allow collecting
4331 while-stepping into a signal handler. A possible smart thing to
4332 do would be to set an internal breakpoint at the signal return
4333 address, continue, and carry on catching this while-stepping
4334 action only when that breakpoint is hit. A future
4336 if (thread
->while_stepping
!= NULL
)
4339 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4342 step
= single_step (lwp
);
4345 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4347 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4349 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4353 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4354 (long) lwp
->stop_pc
);
4358 /* If we have pending signals, consume one if it can be delivered to
4360 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4362 struct pending_signals
**p_sig
;
4364 p_sig
= &lwp
->pending_signals
;
4365 while ((*p_sig
)->prev
!= NULL
)
4366 p_sig
= &(*p_sig
)->prev
;
4368 signal
= (*p_sig
)->signal
;
4369 if ((*p_sig
)->info
.si_signo
!= 0)
4370 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4378 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4379 lwpid_of (thread
), step
? "step" : "continue", signal
,
4380 lwp
->stop_expected
? "expected" : "not expected");
4382 if (the_low_target
.prepare_to_resume
!= NULL
)
4383 the_low_target
.prepare_to_resume (lwp
);
4385 regcache_invalidate_thread (thread
);
4387 lwp
->stepping
= step
;
4389 ptrace_request
= PTRACE_SINGLESTEP
;
4390 else if (gdb_catching_syscalls_p (lwp
))
4391 ptrace_request
= PTRACE_SYSCALL
;
4393 ptrace_request
= PTRACE_CONT
;
4394 ptrace (ptrace_request
,
4396 (PTRACE_TYPE_ARG3
) 0,
4397 /* Coerce to a uintptr_t first to avoid potential gcc warning
4398 of coercing an 8 byte integer to a 4 byte pointer. */
4399 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4401 current_thread
= saved_thread
;
4403 perror_with_name ("resuming thread");
4405 /* Successfully resumed. Clear state that no longer makes sense,
4406 and mark the LWP as running. Must not do this before resuming
4407 otherwise if that fails other code will be confused. E.g., we'd
4408 later try to stop the LWP and hang forever waiting for a stop
4409 status. Note that we must not throw after this is cleared,
4410 otherwise handle_zombie_lwp_error would get confused. */
4412 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4415 /* Called when we try to resume a stopped LWP and that errors out. If
4416 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4417 or about to become), discard the error, clear any pending status
4418 the LWP may have, and return true (we'll collect the exit status
4419 soon enough). Otherwise, return false. */
4422 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4424 struct thread_info
*thread
= get_lwp_thread (lp
);
4426 /* If we get an error after resuming the LWP successfully, we'd
4427 confuse !T state for the LWP being gone. */
4428 gdb_assert (lp
->stopped
);
4430 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4431 because even if ptrace failed with ESRCH, the tracee may be "not
4432 yet fully dead", but already refusing ptrace requests. In that
4433 case the tracee has 'R (Running)' state for a little bit
4434 (observed in Linux 3.18). See also the note on ESRCH in the
4435 ptrace(2) man page. Instead, check whether the LWP has any state
4436 other than ptrace-stopped. */
4438 /* Don't assume anything if /proc/PID/status can't be read. */
4439 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4441 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4442 lp
->status_pending_p
= 0;
4448 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4449 disappears while we try to resume it. */
4452 linux_resume_one_lwp (struct lwp_info
*lwp
,
4453 int step
, int signal
, siginfo_t
*info
)
4457 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4459 CATCH (ex
, RETURN_MASK_ERROR
)
4461 if (!check_ptrace_stopped_lwp_gone (lwp
))
4462 throw_exception (ex
);
4467 struct thread_resume_array
4469 struct thread_resume
*resume
;
4473 /* This function is called once per thread via find_inferior.
4474 ARG is a pointer to a thread_resume_array struct.
4475 We look up the thread specified by ENTRY in ARG, and mark the thread
4476 with a pointer to the appropriate resume request.
4478 This algorithm is O(threads * resume elements), but resume elements
4479 is small (and will remain small at least until GDB supports thread
4483 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
4485 struct thread_info
*thread
= (struct thread_info
*) entry
;
4486 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4488 struct thread_resume_array
*r
;
4490 r
= (struct thread_resume_array
*) arg
;
4492 for (ndx
= 0; ndx
< r
->n
; ndx
++)
4494 ptid_t ptid
= r
->resume
[ndx
].thread
;
4495 if (ptid_equal (ptid
, minus_one_ptid
)
4496 || ptid_equal (ptid
, entry
->id
)
4497 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4499 || (ptid_get_pid (ptid
) == pid_of (thread
)
4500 && (ptid_is_pid (ptid
)
4501 || ptid_get_lwp (ptid
) == -1)))
4503 if (r
->resume
[ndx
].kind
== resume_stop
4504 && thread
->last_resume_kind
== resume_stop
)
4507 debug_printf ("already %s LWP %ld at GDB's request\n",
4508 (thread
->last_status
.kind
4509 == TARGET_WAITKIND_STOPPED
)
4517 lwp
->resume
= &r
->resume
[ndx
];
4518 thread
->last_resume_kind
= lwp
->resume
->kind
;
4520 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4521 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4523 /* If we had a deferred signal to report, dequeue one now.
4524 This can happen if LWP gets more than one signal while
4525 trying to get out of a jump pad. */
4527 && !lwp
->status_pending_p
4528 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4530 lwp
->status_pending_p
= 1;
4533 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4534 "leaving status pending.\n",
4535 WSTOPSIG (lwp
->status_pending
),
4543 /* No resume action for this thread. */
4549 /* find_inferior callback for linux_resume.
4550 Set *FLAG_P if this lwp has an interesting status pending. */
4553 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
4555 struct thread_info
*thread
= (struct thread_info
*) entry
;
4556 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4558 /* LWPs which will not be resumed are not interesting, because
4559 we might not wait for them next time through linux_wait. */
4560 if (lwp
->resume
== NULL
)
4563 if (thread_still_has_status_pending_p (thread
))
4564 * (int *) flag_p
= 1;
4569 /* Return 1 if this lwp that GDB wants running is stopped at an
4570 internal breakpoint that we need to step over. It assumes that any
4571 required STOP_PC adjustment has already been propagated to the
4572 inferior's regcache. */
4575 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
4577 struct thread_info
*thread
= (struct thread_info
*) entry
;
4578 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4579 struct thread_info
*saved_thread
;
4581 struct process_info
*proc
= get_thread_process (thread
);
4583 /* GDBserver is skipping the extra traps from the wrapper program,
4584 don't have to do step over. */
4585 if (proc
->tdesc
== NULL
)
4588 /* LWPs which will not be resumed are not interesting, because we
4589 might not wait for them next time through linux_wait. */
4594 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4599 if (thread
->last_resume_kind
== resume_stop
)
4602 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4608 gdb_assert (lwp
->suspended
>= 0);
4613 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4618 if (lwp
->status_pending_p
)
4621 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4627 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4631 /* If the PC has changed since we stopped, then don't do anything,
4632 and let the breakpoint/tracepoint be hit. This happens if, for
4633 instance, GDB handled the decr_pc_after_break subtraction itself,
4634 GDB is OOL stepping this thread, or the user has issued a "jump"
4635 command, or poked thread's registers herself. */
4636 if (pc
!= lwp
->stop_pc
)
4639 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4640 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4642 paddress (lwp
->stop_pc
), paddress (pc
));
4646 /* On software single step target, resume the inferior with signal
4647 rather than stepping over. */
4648 if (can_software_single_step ()
4649 && lwp
->pending_signals
!= NULL
4650 && lwp_signal_can_be_delivered (lwp
))
4653 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4660 saved_thread
= current_thread
;
4661 current_thread
= thread
;
4663 /* We can only step over breakpoints we know about. */
4664 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4666 /* Don't step over a breakpoint that GDB expects to hit
4667 though. If the condition is being evaluated on the target's side
4668 and it evaluate to false, step over this breakpoint as well. */
4669 if (gdb_breakpoint_here (pc
)
4670 && gdb_condition_true_at_breakpoint (pc
)
4671 && gdb_no_commands_at_breakpoint (pc
))
4674 debug_printf ("Need step over [LWP %ld]? yes, but found"
4675 " GDB breakpoint at 0x%s; skipping step over\n",
4676 lwpid_of (thread
), paddress (pc
));
4678 current_thread
= saved_thread
;
4684 debug_printf ("Need step over [LWP %ld]? yes, "
4685 "found breakpoint at 0x%s\n",
4686 lwpid_of (thread
), paddress (pc
));
4688 /* We've found an lwp that needs stepping over --- return 1 so
4689 that find_inferior stops looking. */
4690 current_thread
= saved_thread
;
4696 current_thread
= saved_thread
;
4699 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4701 lwpid_of (thread
), paddress (pc
));
4706 /* Start a step-over operation on LWP. When LWP stopped at a
4707 breakpoint, to make progress, we need to remove the breakpoint out
4708 of the way. If we let other threads run while we do that, they may
4709 pass by the breakpoint location and miss hitting it. To avoid
4710 that, a step-over momentarily stops all threads while LWP is
4711 single-stepped by either hardware or software while the breakpoint
4712 is temporarily uninserted from the inferior. When the single-step
4713 finishes, we reinsert the breakpoint, and let all threads that are
4714 supposed to be running, run again. */
4717 start_step_over (struct lwp_info
*lwp
)
4719 struct thread_info
*thread
= get_lwp_thread (lwp
);
4720 struct thread_info
*saved_thread
;
4725 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4728 stop_all_lwps (1, lwp
);
4730 if (lwp
->suspended
!= 0)
4732 internal_error (__FILE__
, __LINE__
,
4733 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4738 debug_printf ("Done stopping all threads for step-over.\n");
4740 /* Note, we should always reach here with an already adjusted PC,
4741 either by GDB (if we're resuming due to GDB's request), or by our
4742 caller, if we just finished handling an internal breakpoint GDB
4743 shouldn't care about. */
4746 saved_thread
= current_thread
;
4747 current_thread
= thread
;
4749 lwp
->bp_reinsert
= pc
;
4750 uninsert_breakpoints_at (pc
);
4751 uninsert_fast_tracepoint_jumps_at (pc
);
4753 step
= single_step (lwp
);
4755 current_thread
= saved_thread
;
4757 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4759 /* Require next event from this LWP. */
4760 step_over_bkpt
= thread
->entry
.id
;
4764 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4765 start_step_over, if still there, and delete any reinsert
4766 breakpoints we've set, on non hardware single-step targets. */
4769 finish_step_over (struct lwp_info
*lwp
)
4771 if (lwp
->bp_reinsert
!= 0)
4773 struct thread_info
*saved_thread
= current_thread
;
4776 debug_printf ("Finished step over.\n");
4778 current_thread
= get_lwp_thread (lwp
);
4780 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4781 may be no breakpoint to reinsert there by now. */
4782 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4783 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4785 lwp
->bp_reinsert
= 0;
4787 /* Delete any software-single-step reinsert breakpoints. No
4788 longer needed. We don't have to worry about other threads
4789 hitting this trap, and later not being able to explain it,
4790 because we were stepping over a breakpoint, and we hold all
4791 threads but LWP stopped while doing that. */
4792 if (!can_hardware_single_step ())
4794 gdb_assert (has_reinsert_breakpoints (current_process ()));
4795 delete_reinsert_breakpoints ();
4798 step_over_bkpt
= null_ptid
;
4799 current_thread
= saved_thread
;
4806 /* If there's a step over in progress, wait until all threads stop
4807 (that is, until the stepping thread finishes its step), and
4808 unsuspend all lwps. The stepping thread ends with its status
4809 pending, which is processed later when we get back to processing
4813 complete_ongoing_step_over (void)
4815 if (!ptid_equal (step_over_bkpt
, null_ptid
))
4817 struct lwp_info
*lwp
;
4822 debug_printf ("detach: step over in progress, finish it first\n");
4824 /* Passing NULL_PTID as filter indicates we want all events to
4825 be left pending. Eventually this returns when there are no
4826 unwaited-for children left. */
4827 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4829 gdb_assert (ret
== -1);
4831 lwp
= find_lwp_pid (step_over_bkpt
);
4833 finish_step_over (lwp
);
4834 step_over_bkpt
= null_ptid
;
4835 unsuspend_all_lwps (lwp
);
4839 /* This function is called once per thread. We check the thread's resume
4840 request, which will tell us whether to resume, step, or leave the thread
4841 stopped; and what signal, if any, it should be sent.
4843 For threads which we aren't explicitly told otherwise, we preserve
4844 the stepping flag; this is used for stepping over gdbserver-placed
4847 If pending_flags was set in any thread, we queue any needed
4848 signals, since we won't actually resume. We already have a pending
4849 event to report, so we don't need to preserve any step requests;
4850 they should be re-issued if necessary. */
4853 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
4855 struct thread_info
*thread
= (struct thread_info
*) entry
;
4856 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4858 int leave_all_stopped
= * (int *) arg
;
4861 if (lwp
->resume
== NULL
)
4864 if (lwp
->resume
->kind
== resume_stop
)
4867 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4872 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
4874 /* Stop the thread, and wait for the event asynchronously,
4875 through the event loop. */
4881 debug_printf ("already stopped LWP %ld\n",
4884 /* The LWP may have been stopped in an internal event that
4885 was not meant to be notified back to GDB (e.g., gdbserver
4886 breakpoint), so we should be reporting a stop event in
4889 /* If the thread already has a pending SIGSTOP, this is a
4890 no-op. Otherwise, something later will presumably resume
4891 the thread and this will cause it to cancel any pending
4892 operation, due to last_resume_kind == resume_stop. If
4893 the thread already has a pending status to report, we
4894 will still report it the next time we wait - see
4895 status_pending_p_callback. */
4897 /* If we already have a pending signal to report, then
4898 there's no need to queue a SIGSTOP, as this means we're
4899 midway through moving the LWP out of the jumppad, and we
4900 will report the pending signal as soon as that is
4902 if (lwp
->pending_signals_to_report
== NULL
)
4906 /* For stop requests, we're done. */
4908 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4912 /* If this thread which is about to be resumed has a pending status,
4913 then don't resume it - we can just report the pending status.
4914 Likewise if it is suspended, because e.g., another thread is
4915 stepping past a breakpoint. Make sure to queue any signals that
4916 would otherwise be sent. In all-stop mode, we do this decision
4917 based on if *any* thread has a pending status. If there's a
4918 thread that needs the step-over-breakpoint dance, then don't
4919 resume any other thread but that particular one. */
4920 leave_pending
= (lwp
->suspended
4921 || lwp
->status_pending_p
4922 || leave_all_stopped
);
4927 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
4929 step
= (lwp
->resume
->kind
== resume_step
);
4930 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
4935 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
4937 /* If we have a new signal, enqueue the signal. */
4938 if (lwp
->resume
->sig
!= 0)
4940 struct pending_signals
*p_sig
= XCNEW (struct pending_signals
);
4942 p_sig
->prev
= lwp
->pending_signals
;
4943 p_sig
->signal
= lwp
->resume
->sig
;
4945 /* If this is the same signal we were previously stopped by,
4946 make sure to queue its siginfo. We can ignore the return
4947 value of ptrace; if it fails, we'll skip
4948 PTRACE_SETSIGINFO. */
4949 if (WIFSTOPPED (lwp
->last_status
)
4950 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
4951 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4954 lwp
->pending_signals
= p_sig
;
4958 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4964 linux_resume (struct thread_resume
*resume_info
, size_t n
)
4966 struct thread_resume_array array
= { resume_info
, n
};
4967 struct thread_info
*need_step_over
= NULL
;
4969 int leave_all_stopped
;
4974 debug_printf ("linux_resume:\n");
4977 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
4979 /* If there is a thread which would otherwise be resumed, which has
4980 a pending status, then don't resume any threads - we can just
4981 report the pending status. Make sure to queue any signals that
4982 would otherwise be sent. In non-stop mode, we'll apply this
4983 logic to each thread individually. We consume all pending events
4984 before considering to start a step-over (in all-stop). */
4987 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
4989 /* If there is a thread which would otherwise be resumed, which is
4990 stopped at a breakpoint that needs stepping over, then don't
4991 resume any threads - have it step over the breakpoint with all
4992 other threads stopped, then resume all threads again. Make sure
4993 to queue any signals that would otherwise be delivered or
4995 if (!any_pending
&& supports_breakpoints ())
4997 = (struct thread_info
*) find_inferior (&all_threads
,
4998 need_step_over_p
, NULL
);
5000 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5004 if (need_step_over
!= NULL
)
5005 debug_printf ("Not resuming all, need step over\n");
5006 else if (any_pending
)
5007 debug_printf ("Not resuming, all-stop and found "
5008 "an LWP with pending status\n");
5010 debug_printf ("Resuming, no pending status or step over needed\n");
5013 /* Even if we're leaving threads stopped, queue all signals we'd
5014 otherwise deliver. */
5015 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
5018 start_step_over (get_thread_lwp (need_step_over
));
5022 debug_printf ("linux_resume done\n");
5026 /* We may have events that were pending that can/should be sent to
5027 the client now. Trigger a linux_wait call. */
5028 if (target_is_async_p ())
5032 /* This function is called once per thread. We check the thread's
5033 last resume request, which will tell us whether to resume, step, or
5034 leave the thread stopped. Any signal the client requested to be
5035 delivered has already been enqueued at this point.
5037 If any thread that GDB wants running is stopped at an internal
5038 breakpoint that needs stepping over, we start a step-over operation
5039 on that particular thread, and leave all others stopped. */
5042 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
5044 struct thread_info
*thread
= (struct thread_info
*) entry
;
5045 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5052 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5057 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5061 if (thread
->last_resume_kind
== resume_stop
5062 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5065 debug_printf (" client wants LWP to remain %ld stopped\n",
5070 if (lwp
->status_pending_p
)
5073 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5078 gdb_assert (lwp
->suspended
>= 0);
5083 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5087 if (thread
->last_resume_kind
== resume_stop
5088 && lwp
->pending_signals_to_report
== NULL
5089 && lwp
->collecting_fast_tracepoint
== 0)
5091 /* We haven't reported this LWP as stopped yet (otherwise, the
5092 last_status.kind check above would catch it, and we wouldn't
5093 reach here. This LWP may have been momentarily paused by a
5094 stop_all_lwps call while handling for example, another LWP's
5095 step-over. In that case, the pending expected SIGSTOP signal
5096 that was queued at vCont;t handling time will have already
5097 been consumed by wait_for_sigstop, and so we need to requeue
5098 another one here. Note that if the LWP already has a SIGSTOP
5099 pending, this is a no-op. */
5102 debug_printf ("Client wants LWP %ld to stop. "
5103 "Making sure it has a SIGSTOP pending\n",
5109 if (thread
->last_resume_kind
== resume_step
)
5112 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5116 else if (lwp
->bp_reinsert
!= 0)
5119 debug_printf (" stepping LWP %ld, reinsert set\n",
5122 step
= maybe_hw_step (thread
);
5127 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5132 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
5134 struct thread_info
*thread
= (struct thread_info
*) entry
;
5135 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5140 lwp_suspended_decr (lwp
);
5142 return proceed_one_lwp (entry
, except
);
5145 /* When we finish a step-over, set threads running again. If there's
5146 another thread that may need a step-over, now's the time to start
5147 it. Eventually, we'll move all threads past their breakpoints. */
5150 proceed_all_lwps (void)
5152 struct thread_info
*need_step_over
;
5154 /* If there is a thread which would otherwise be resumed, which is
5155 stopped at a breakpoint that needs stepping over, then don't
5156 resume any threads - have it step over the breakpoint with all
5157 other threads stopped, then resume all threads again. */
5159 if (supports_breakpoints ())
5162 = (struct thread_info
*) find_inferior (&all_threads
,
5163 need_step_over_p
, NULL
);
5165 if (need_step_over
!= NULL
)
5168 debug_printf ("proceed_all_lwps: found "
5169 "thread %ld needing a step-over\n",
5170 lwpid_of (need_step_over
));
5172 start_step_over (get_thread_lwp (need_step_over
));
5178 debug_printf ("Proceeding, no step-over needed\n");
5180 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
5183 /* Stopped LWPs that the client wanted to be running, that don't have
5184 pending statuses, are set to run again, except for EXCEPT, if not
5185 NULL. This undoes a stop_all_lwps call. */
5188 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5194 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5195 lwpid_of (get_lwp_thread (except
)));
5197 debug_printf ("unstopping all lwps\n");
5201 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
5203 find_inferior (&all_threads
, proceed_one_lwp
, except
);
5207 debug_printf ("unstop_all_lwps done\n");
5213 #ifdef HAVE_LINUX_REGSETS
5215 #define use_linux_regsets 1
5217 /* Returns true if REGSET has been disabled. */
5220 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5222 return (info
->disabled_regsets
!= NULL
5223 && info
->disabled_regsets
[regset
- info
->regsets
]);
5226 /* Disable REGSET. */
5229 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5233 dr_offset
= regset
- info
->regsets
;
5234 if (info
->disabled_regsets
== NULL
)
5235 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5236 info
->disabled_regsets
[dr_offset
] = 1;
5240 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5241 struct regcache
*regcache
)
5243 struct regset_info
*regset
;
5244 int saw_general_regs
= 0;
5248 pid
= lwpid_of (current_thread
);
5249 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5254 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5257 buf
= xmalloc (regset
->size
);
5259 nt_type
= regset
->nt_type
;
5263 iov
.iov_len
= regset
->size
;
5264 data
= (void *) &iov
;
5270 res
= ptrace (regset
->get_request
, pid
,
5271 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5273 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5279 /* If we get EIO on a regset, do not try it again for
5280 this process mode. */
5281 disable_regset (regsets_info
, regset
);
5283 else if (errno
== ENODATA
)
5285 /* ENODATA may be returned if the regset is currently
5286 not "active". This can happen in normal operation,
5287 so suppress the warning in this case. */
5292 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5299 if (regset
->type
== GENERAL_REGS
)
5300 saw_general_regs
= 1;
5301 regset
->store_function (regcache
, buf
);
5305 if (saw_general_regs
)
5312 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5313 struct regcache
*regcache
)
5315 struct regset_info
*regset
;
5316 int saw_general_regs
= 0;
5320 pid
= lwpid_of (current_thread
);
5321 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5326 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5327 || regset
->fill_function
== NULL
)
5330 buf
= xmalloc (regset
->size
);
5332 /* First fill the buffer with the current register set contents,
5333 in case there are any items in the kernel's regset that are
5334 not in gdbserver's regcache. */
5336 nt_type
= regset
->nt_type
;
5340 iov
.iov_len
= regset
->size
;
5341 data
= (void *) &iov
;
5347 res
= ptrace (regset
->get_request
, pid
,
5348 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5350 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5355 /* Then overlay our cached registers on that. */
5356 regset
->fill_function (regcache
, buf
);
5358 /* Only now do we write the register set. */
5360 res
= ptrace (regset
->set_request
, pid
,
5361 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5363 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5371 /* If we get EIO on a regset, do not try it again for
5372 this process mode. */
5373 disable_regset (regsets_info
, regset
);
5375 else if (errno
== ESRCH
)
5377 /* At this point, ESRCH should mean the process is
5378 already gone, in which case we simply ignore attempts
5379 to change its registers. See also the related
5380 comment in linux_resume_one_lwp. */
5386 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5389 else if (regset
->type
== GENERAL_REGS
)
5390 saw_general_regs
= 1;
5393 if (saw_general_regs
)
5399 #else /* !HAVE_LINUX_REGSETS */
5401 #define use_linux_regsets 0
5402 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5403 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5407 /* Return 1 if register REGNO is supported by one of the regset ptrace
5408 calls or 0 if it has to be transferred individually. */
5411 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5413 unsigned char mask
= 1 << (regno
% 8);
5414 size_t index
= regno
/ 8;
5416 return (use_linux_regsets
5417 && (regs_info
->regset_bitmap
== NULL
5418 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5421 #ifdef HAVE_LINUX_USRREGS
5424 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5428 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5429 error ("Invalid register number %d.", regnum
);
5431 addr
= usrregs
->regmap
[regnum
];
5436 /* Fetch one register. */
5438 fetch_register (const struct usrregs_info
*usrregs
,
5439 struct regcache
*regcache
, int regno
)
5446 if (regno
>= usrregs
->num_regs
)
5448 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5451 regaddr
= register_addr (usrregs
, regno
);
5455 size
= ((register_size (regcache
->tdesc
, regno
)
5456 + sizeof (PTRACE_XFER_TYPE
) - 1)
5457 & -sizeof (PTRACE_XFER_TYPE
));
5458 buf
= (char *) alloca (size
);
5460 pid
= lwpid_of (current_thread
);
5461 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5464 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5465 ptrace (PTRACE_PEEKUSER
, pid
,
5466 /* Coerce to a uintptr_t first to avoid potential gcc warning
5467 of coercing an 8 byte integer to a 4 byte pointer. */
5468 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5469 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5471 error ("reading register %d: %s", regno
, strerror (errno
));
5474 if (the_low_target
.supply_ptrace_register
)
5475 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5477 supply_register (regcache
, regno
, buf
);
5480 /* Store one register. */
5482 store_register (const struct usrregs_info
*usrregs
,
5483 struct regcache
*regcache
, int regno
)
5490 if (regno
>= usrregs
->num_regs
)
5492 if ((*the_low_target
.cannot_store_register
) (regno
))
5495 regaddr
= register_addr (usrregs
, regno
);
5499 size
= ((register_size (regcache
->tdesc
, regno
)
5500 + sizeof (PTRACE_XFER_TYPE
) - 1)
5501 & -sizeof (PTRACE_XFER_TYPE
));
5502 buf
= (char *) alloca (size
);
5503 memset (buf
, 0, size
);
5505 if (the_low_target
.collect_ptrace_register
)
5506 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5508 collect_register (regcache
, regno
, buf
);
5510 pid
= lwpid_of (current_thread
);
5511 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5514 ptrace (PTRACE_POKEUSER
, pid
,
5515 /* Coerce to a uintptr_t first to avoid potential gcc warning
5516 about coercing an 8 byte integer to a 4 byte pointer. */
5517 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5518 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5521 /* At this point, ESRCH should mean the process is
5522 already gone, in which case we simply ignore attempts
5523 to change its registers. See also the related
5524 comment in linux_resume_one_lwp. */
5528 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5529 error ("writing register %d: %s", regno
, strerror (errno
));
5531 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5535 /* Fetch all registers, or just one, from the child process.
5536 If REGNO is -1, do this for all registers, skipping any that are
5537 assumed to have been retrieved by regsets_fetch_inferior_registers,
5538 unless ALL is non-zero.
5539 Otherwise, REGNO specifies which register (so we can save time). */
5541 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5542 struct regcache
*regcache
, int regno
, int all
)
5544 struct usrregs_info
*usr
= regs_info
->usrregs
;
5548 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5549 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5550 fetch_register (usr
, regcache
, regno
);
5553 fetch_register (usr
, regcache
, regno
);
5556 /* Store our register values back into the inferior.
5557 If REGNO is -1, do this for all registers, skipping any that are
5558 assumed to have been saved by regsets_store_inferior_registers,
5559 unless ALL is non-zero.
5560 Otherwise, REGNO specifies which register (so we can save time). */
5562 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5563 struct regcache
*regcache
, int regno
, int all
)
5565 struct usrregs_info
*usr
= regs_info
->usrregs
;
5569 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5570 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5571 store_register (usr
, regcache
, regno
);
5574 store_register (usr
, regcache
, regno
);
5577 #else /* !HAVE_LINUX_USRREGS */
5579 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5580 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5586 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5590 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5594 if (the_low_target
.fetch_register
!= NULL
5595 && regs_info
->usrregs
!= NULL
)
5596 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5597 (*the_low_target
.fetch_register
) (regcache
, regno
);
5599 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5600 if (regs_info
->usrregs
!= NULL
)
5601 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5605 if (the_low_target
.fetch_register
!= NULL
5606 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5609 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5611 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5613 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5614 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5619 linux_store_registers (struct regcache
*regcache
, int regno
)
5623 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5627 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5629 if (regs_info
->usrregs
!= NULL
)
5630 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5634 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5636 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5638 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5639 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5644 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5645 to debugger memory starting at MYADDR. */
5648 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5650 int pid
= lwpid_of (current_thread
);
5651 register PTRACE_XFER_TYPE
*buffer
;
5652 register CORE_ADDR addr
;
5659 /* Try using /proc. Don't bother for one word. */
5660 if (len
>= 3 * sizeof (long))
5664 /* We could keep this file open and cache it - possibly one per
5665 thread. That requires some juggling, but is even faster. */
5666 sprintf (filename
, "/proc/%d/mem", pid
);
5667 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5671 /* If pread64 is available, use it. It's faster if the kernel
5672 supports it (only one syscall), and it's 64-bit safe even on
5673 32-bit platforms (for instance, SPARC debugging a SPARC64
5676 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5679 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5680 bytes
= read (fd
, myaddr
, len
);
5687 /* Some data was read, we'll try to get the rest with ptrace. */
5697 /* Round starting address down to longword boundary. */
5698 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5699 /* Round ending address up; get number of longwords that makes. */
5700 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5701 / sizeof (PTRACE_XFER_TYPE
));
5702 /* Allocate buffer of that many longwords. */
5703 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5705 /* Read all the longwords */
5707 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5709 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5710 about coercing an 8 byte integer to a 4 byte pointer. */
5711 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5712 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5713 (PTRACE_TYPE_ARG4
) 0);
5719 /* Copy appropriate bytes out of the buffer. */
5722 i
*= sizeof (PTRACE_XFER_TYPE
);
5723 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5725 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5732 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5733 memory at MEMADDR. On failure (cannot write to the inferior)
5734 returns the value of errno. Always succeeds if LEN is zero. */
5737 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5740 /* Round starting address down to longword boundary. */
5741 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5742 /* Round ending address up; get number of longwords that makes. */
5744 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5745 / sizeof (PTRACE_XFER_TYPE
);
5747 /* Allocate buffer of that many longwords. */
5748 register PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5750 int pid
= lwpid_of (current_thread
);
5754 /* Zero length write always succeeds. */
5760 /* Dump up to four bytes. */
5761 char str
[4 * 2 + 1];
5763 int dump
= len
< 4 ? len
: 4;
5765 for (i
= 0; i
< dump
; i
++)
5767 sprintf (p
, "%02x", myaddr
[i
]);
5772 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5773 str
, (long) memaddr
, pid
);
5776 /* Fill start and end extra bytes of buffer with existing memory data. */
5779 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5780 about coercing an 8 byte integer to a 4 byte pointer. */
5781 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5782 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5783 (PTRACE_TYPE_ARG4
) 0);
5791 = ptrace (PTRACE_PEEKTEXT
, pid
,
5792 /* Coerce to a uintptr_t first to avoid potential gcc warning
5793 about coercing an 8 byte integer to a 4 byte pointer. */
5794 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5795 * sizeof (PTRACE_XFER_TYPE
)),
5796 (PTRACE_TYPE_ARG4
) 0);
5801 /* Copy data to be written over corresponding part of buffer. */
5803 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5806 /* Write the entire buffer. */
5808 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5811 ptrace (PTRACE_POKETEXT
, pid
,
5812 /* Coerce to a uintptr_t first to avoid potential gcc warning
5813 about coercing an 8 byte integer to a 4 byte pointer. */
5814 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5815 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5824 linux_look_up_symbols (void)
5826 #ifdef USE_THREAD_DB
5827 struct process_info
*proc
= current_process ();
5829 if (proc
->priv
->thread_db
!= NULL
)
5837 linux_request_interrupt (void)
5839 extern unsigned long signal_pid
;
5841 /* Send a SIGINT to the process group. This acts just like the user
5842 typed a ^C on the controlling terminal. */
5843 kill (-signal_pid
, SIGINT
);
5846 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5847 to debugger memory starting at MYADDR. */
5850 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5852 char filename
[PATH_MAX
];
5854 int pid
= lwpid_of (current_thread
);
5856 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5858 fd
= open (filename
, O_RDONLY
);
5862 if (offset
!= (CORE_ADDR
) 0
5863 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5866 n
= read (fd
, myaddr
, len
);
5873 /* These breakpoint and watchpoint related wrapper functions simply
5874 pass on the function call if the target has registered a
5875 corresponding function. */
5878 linux_supports_z_point_type (char z_type
)
5880 return (the_low_target
.supports_z_point_type
!= NULL
5881 && the_low_target
.supports_z_point_type (z_type
));
5885 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5886 int size
, struct raw_breakpoint
*bp
)
5888 if (type
== raw_bkpt_type_sw
)
5889 return insert_memory_breakpoint (bp
);
5890 else if (the_low_target
.insert_point
!= NULL
)
5891 return the_low_target
.insert_point (type
, addr
, size
, bp
);
5893 /* Unsupported (see target.h). */
5898 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5899 int size
, struct raw_breakpoint
*bp
)
5901 if (type
== raw_bkpt_type_sw
)
5902 return remove_memory_breakpoint (bp
);
5903 else if (the_low_target
.remove_point
!= NULL
)
5904 return the_low_target
.remove_point (type
, addr
, size
, bp
);
5906 /* Unsupported (see target.h). */
5910 /* Implement the to_stopped_by_sw_breakpoint target_ops
5914 linux_stopped_by_sw_breakpoint (void)
5916 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5918 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
5921 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
5925 linux_supports_stopped_by_sw_breakpoint (void)
5927 return USE_SIGTRAP_SIGINFO
;
5930 /* Implement the to_stopped_by_hw_breakpoint target_ops
5934 linux_stopped_by_hw_breakpoint (void)
5936 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5938 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
5941 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
5945 linux_supports_stopped_by_hw_breakpoint (void)
5947 return USE_SIGTRAP_SIGINFO
;
5950 /* Implement the supports_hardware_single_step target_ops method. */
5953 linux_supports_hardware_single_step (void)
5955 return can_hardware_single_step ();
5959 linux_supports_software_single_step (void)
5961 return can_software_single_step ();
5965 linux_stopped_by_watchpoint (void)
5967 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5969 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
5973 linux_stopped_data_address (void)
5975 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5977 return lwp
->stopped_data_address
;
5980 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
5981 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
5982 && defined(PT_TEXT_END_ADDR)
5984 /* This is only used for targets that define PT_TEXT_ADDR,
5985 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
5986 the target has different ways of acquiring this information, like
5989 /* Under uClinux, programs are loaded at non-zero offsets, which we need
5990 to tell gdb about. */
5993 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
5995 unsigned long text
, text_end
, data
;
5996 int pid
= lwpid_of (current_thread
);
6000 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6001 (PTRACE_TYPE_ARG4
) 0);
6002 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6003 (PTRACE_TYPE_ARG4
) 0);
6004 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6005 (PTRACE_TYPE_ARG4
) 0);
6009 /* Both text and data offsets produced at compile-time (and so
6010 used by gdb) are relative to the beginning of the program,
6011 with the data segment immediately following the text segment.
6012 However, the actual runtime layout in memory may put the data
6013 somewhere else, so when we send gdb a data base-address, we
6014 use the real data base address and subtract the compile-time
6015 data base-address from it (which is just the length of the
6016 text segment). BSS immediately follows data in both
6019 *data_p
= data
- (text_end
- text
);
6028 linux_qxfer_osdata (const char *annex
,
6029 unsigned char *readbuf
, unsigned const char *writebuf
,
6030 CORE_ADDR offset
, int len
)
6032 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6035 /* Convert a native/host siginfo object, into/from the siginfo in the
6036 layout of the inferiors' architecture. */
6039 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6043 if (the_low_target
.siginfo_fixup
!= NULL
)
6044 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6046 /* If there was no callback, or the callback didn't do anything,
6047 then just do a straight memcpy. */
6051 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6053 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6058 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6059 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6063 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6065 if (current_thread
== NULL
)
6068 pid
= lwpid_of (current_thread
);
6071 debug_printf ("%s siginfo for lwp %d.\n",
6072 readbuf
!= NULL
? "Reading" : "Writing",
6075 if (offset
>= sizeof (siginfo
))
6078 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6081 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6082 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6083 inferior with a 64-bit GDBSERVER should look the same as debugging it
6084 with a 32-bit GDBSERVER, we need to convert it. */
6085 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6087 if (offset
+ len
> sizeof (siginfo
))
6088 len
= sizeof (siginfo
) - offset
;
6090 if (readbuf
!= NULL
)
6091 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6094 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6096 /* Convert back to ptrace layout before flushing it out. */
6097 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6099 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6106 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6107 so we notice when children change state; as the handler for the
6108 sigsuspend in my_waitpid. */
6111 sigchld_handler (int signo
)
6113 int old_errno
= errno
;
6119 /* fprintf is not async-signal-safe, so call write
6121 if (write (2, "sigchld_handler\n",
6122 sizeof ("sigchld_handler\n") - 1) < 0)
6123 break; /* just ignore */
6127 if (target_is_async_p ())
6128 async_file_mark (); /* trigger a linux_wait */
6134 linux_supports_non_stop (void)
6140 linux_async (int enable
)
6142 int previous
= target_is_async_p ();
6145 debug_printf ("linux_async (%d), previous=%d\n",
6148 if (previous
!= enable
)
6151 sigemptyset (&mask
);
6152 sigaddset (&mask
, SIGCHLD
);
6154 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6158 if (pipe (linux_event_pipe
) == -1)
6160 linux_event_pipe
[0] = -1;
6161 linux_event_pipe
[1] = -1;
6162 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6164 warning ("creating event pipe failed.");
6168 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6169 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6171 /* Register the event loop handler. */
6172 add_file_handler (linux_event_pipe
[0],
6173 handle_target_event
, NULL
);
6175 /* Always trigger a linux_wait. */
6180 delete_file_handler (linux_event_pipe
[0]);
6182 close (linux_event_pipe
[0]);
6183 close (linux_event_pipe
[1]);
6184 linux_event_pipe
[0] = -1;
6185 linux_event_pipe
[1] = -1;
6188 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6195 linux_start_non_stop (int nonstop
)
6197 /* Register or unregister from event-loop accordingly. */
6198 linux_async (nonstop
);
6200 if (target_is_async_p () != (nonstop
!= 0))
6207 linux_supports_multi_process (void)
6212 /* Check if fork events are supported. */
6215 linux_supports_fork_events (void)
6217 return linux_supports_tracefork ();
6220 /* Check if vfork events are supported. */
6223 linux_supports_vfork_events (void)
6225 return linux_supports_tracefork ();
6228 /* Check if exec events are supported. */
6231 linux_supports_exec_events (void)
6233 return linux_supports_traceexec ();
6236 /* Callback for 'find_inferior'. Set the (possibly changed) ptrace
6237 options for the specified lwp. */
6240 reset_lwp_ptrace_options_callback (struct inferior_list_entry
*entry
,
6243 struct thread_info
*thread
= (struct thread_info
*) entry
;
6244 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6248 /* Stop the lwp so we can modify its ptrace options. */
6249 lwp
->must_set_ptrace_flags
= 1;
6250 linux_stop_lwp (lwp
);
6254 /* Already stopped; go ahead and set the ptrace options. */
6255 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6256 int options
= linux_low_ptrace_options (proc
->attached
);
6258 linux_enable_event_reporting (lwpid_of (thread
), options
);
6259 lwp
->must_set_ptrace_flags
= 0;
6265 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6266 ptrace flags for all inferiors. This is in case the new GDB connection
6267 doesn't support the same set of events that the previous one did. */
6270 linux_handle_new_gdb_connection (void)
6274 /* Request that all the lwps reset their ptrace options. */
6275 find_inferior (&all_threads
, reset_lwp_ptrace_options_callback
, &pid
);
6279 linux_supports_disable_randomization (void)
6281 #ifdef HAVE_PERSONALITY
6289 linux_supports_agent (void)
6295 linux_supports_range_stepping (void)
6297 if (*the_low_target
.supports_range_stepping
== NULL
)
6300 return (*the_low_target
.supports_range_stepping
) ();
6303 /* Enumerate spufs IDs for process PID. */
6305 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6311 struct dirent
*entry
;
6313 sprintf (path
, "/proc/%ld/fd", pid
);
6314 dir
= opendir (path
);
6319 while ((entry
= readdir (dir
)) != NULL
)
6325 fd
= atoi (entry
->d_name
);
6329 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6330 if (stat (path
, &st
) != 0)
6332 if (!S_ISDIR (st
.st_mode
))
6335 if (statfs (path
, &stfs
) != 0)
6337 if (stfs
.f_type
!= SPUFS_MAGIC
)
6340 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6342 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6352 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6353 object type, using the /proc file system. */
6355 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6356 unsigned const char *writebuf
,
6357 CORE_ADDR offset
, int len
)
6359 long pid
= lwpid_of (current_thread
);
6364 if (!writebuf
&& !readbuf
)
6372 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6375 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6376 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6381 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6388 ret
= write (fd
, writebuf
, (size_t) len
);
6390 ret
= read (fd
, readbuf
, (size_t) len
);
6396 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6397 struct target_loadseg
6399 /* Core address to which the segment is mapped. */
6401 /* VMA recorded in the program header. */
6403 /* Size of this segment in memory. */
6407 # if defined PT_GETDSBT
6408 struct target_loadmap
6410 /* Protocol version number, must be zero. */
6412 /* Pointer to the DSBT table, its size, and the DSBT index. */
6413 unsigned *dsbt_table
;
6414 unsigned dsbt_size
, dsbt_index
;
6415 /* Number of segments in this map. */
6417 /* The actual memory map. */
6418 struct target_loadseg segs
[/*nsegs*/];
6420 # define LINUX_LOADMAP PT_GETDSBT
6421 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6422 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6424 struct target_loadmap
6426 /* Protocol version number, must be zero. */
6428 /* Number of segments in this map. */
6430 /* The actual memory map. */
6431 struct target_loadseg segs
[/*nsegs*/];
6433 # define LINUX_LOADMAP PTRACE_GETFDPIC
6434 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6435 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6439 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6440 unsigned char *myaddr
, unsigned int len
)
6442 int pid
= lwpid_of (current_thread
);
6444 struct target_loadmap
*data
= NULL
;
6445 unsigned int actual_length
, copy_length
;
6447 if (strcmp (annex
, "exec") == 0)
6448 addr
= (int) LINUX_LOADMAP_EXEC
;
6449 else if (strcmp (annex
, "interp") == 0)
6450 addr
= (int) LINUX_LOADMAP_INTERP
;
6454 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6460 actual_length
= sizeof (struct target_loadmap
)
6461 + sizeof (struct target_loadseg
) * data
->nsegs
;
6463 if (offset
< 0 || offset
> actual_length
)
6466 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6467 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6471 # define linux_read_loadmap NULL
6472 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6475 linux_process_qsupported (char **features
, int count
)
6477 if (the_low_target
.process_qsupported
!= NULL
)
6478 the_low_target
.process_qsupported (features
, count
);
6482 linux_supports_catch_syscall (void)
6484 return (the_low_target
.get_syscall_trapinfo
!= NULL
6485 && linux_supports_tracesysgood ());
6489 linux_get_ipa_tdesc_idx (void)
6491 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6494 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6498 linux_supports_tracepoints (void)
6500 if (*the_low_target
.supports_tracepoints
== NULL
)
6503 return (*the_low_target
.supports_tracepoints
) ();
6507 linux_read_pc (struct regcache
*regcache
)
6509 if (the_low_target
.get_pc
== NULL
)
6512 return (*the_low_target
.get_pc
) (regcache
);
6516 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6518 gdb_assert (the_low_target
.set_pc
!= NULL
);
6520 (*the_low_target
.set_pc
) (regcache
, pc
);
6524 linux_thread_stopped (struct thread_info
*thread
)
6526 return get_thread_lwp (thread
)->stopped
;
6529 /* This exposes stop-all-threads functionality to other modules. */
6532 linux_pause_all (int freeze
)
6534 stop_all_lwps (freeze
, NULL
);
6537 /* This exposes unstop-all-threads functionality to other gdbserver
6541 linux_unpause_all (int unfreeze
)
6543 unstop_all_lwps (unfreeze
, NULL
);
6547 linux_prepare_to_access_memory (void)
6549 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6552 linux_pause_all (1);
6557 linux_done_accessing_memory (void)
6559 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6562 linux_unpause_all (1);
6566 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6567 CORE_ADDR collector
,
6570 CORE_ADDR
*jump_entry
,
6571 CORE_ADDR
*trampoline
,
6572 ULONGEST
*trampoline_size
,
6573 unsigned char *jjump_pad_insn
,
6574 ULONGEST
*jjump_pad_insn_size
,
6575 CORE_ADDR
*adjusted_insn_addr
,
6576 CORE_ADDR
*adjusted_insn_addr_end
,
6579 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6580 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6581 jump_entry
, trampoline
, trampoline_size
,
6582 jjump_pad_insn
, jjump_pad_insn_size
,
6583 adjusted_insn_addr
, adjusted_insn_addr_end
,
6587 static struct emit_ops
*
6588 linux_emit_ops (void)
6590 if (the_low_target
.emit_ops
!= NULL
)
6591 return (*the_low_target
.emit_ops
) ();
6597 linux_get_min_fast_tracepoint_insn_len (void)
6599 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6602 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6605 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6606 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6608 char filename
[PATH_MAX
];
6610 const int auxv_size
= is_elf64
6611 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6612 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6614 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6616 fd
= open (filename
, O_RDONLY
);
6622 while (read (fd
, buf
, auxv_size
) == auxv_size
6623 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6627 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6629 switch (aux
->a_type
)
6632 *phdr_memaddr
= aux
->a_un
.a_val
;
6635 *num_phdr
= aux
->a_un
.a_val
;
6641 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6643 switch (aux
->a_type
)
6646 *phdr_memaddr
= aux
->a_un
.a_val
;
6649 *num_phdr
= aux
->a_un
.a_val
;
6657 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6659 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6660 "phdr_memaddr = %ld, phdr_num = %d",
6661 (long) *phdr_memaddr
, *num_phdr
);
6668 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6671 get_dynamic (const int pid
, const int is_elf64
)
6673 CORE_ADDR phdr_memaddr
, relocation
;
6675 unsigned char *phdr_buf
;
6676 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6678 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6681 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6682 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6684 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6687 /* Compute relocation: it is expected to be 0 for "regular" executables,
6688 non-zero for PIE ones. */
6690 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6693 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6695 if (p
->p_type
== PT_PHDR
)
6696 relocation
= phdr_memaddr
- p
->p_vaddr
;
6700 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6702 if (p
->p_type
== PT_PHDR
)
6703 relocation
= phdr_memaddr
- p
->p_vaddr
;
6706 if (relocation
== -1)
6708 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6709 any real world executables, including PIE executables, have always
6710 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6711 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6712 or present DT_DEBUG anyway (fpc binaries are statically linked).
6714 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6716 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6721 for (i
= 0; i
< num_phdr
; i
++)
6725 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6727 if (p
->p_type
== PT_DYNAMIC
)
6728 return p
->p_vaddr
+ relocation
;
6732 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6734 if (p
->p_type
== PT_DYNAMIC
)
6735 return p
->p_vaddr
+ relocation
;
6742 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6743 can be 0 if the inferior does not yet have the library list initialized.
6744 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6745 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6748 get_r_debug (const int pid
, const int is_elf64
)
6750 CORE_ADDR dynamic_memaddr
;
6751 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6752 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6755 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6756 if (dynamic_memaddr
== 0)
6759 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6763 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6764 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6768 unsigned char buf
[sizeof (Elf64_Xword
)];
6772 #ifdef DT_MIPS_RLD_MAP
6773 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6775 if (linux_read_memory (dyn
->d_un
.d_val
,
6776 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6781 #endif /* DT_MIPS_RLD_MAP */
6782 #ifdef DT_MIPS_RLD_MAP_REL
6783 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6785 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6786 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6791 #endif /* DT_MIPS_RLD_MAP_REL */
6793 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6794 map
= dyn
->d_un
.d_val
;
6796 if (dyn
->d_tag
== DT_NULL
)
6801 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6802 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6806 unsigned char buf
[sizeof (Elf32_Word
)];
6810 #ifdef DT_MIPS_RLD_MAP
6811 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6813 if (linux_read_memory (dyn
->d_un
.d_val
,
6814 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6819 #endif /* DT_MIPS_RLD_MAP */
6820 #ifdef DT_MIPS_RLD_MAP_REL
6821 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6823 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6824 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6829 #endif /* DT_MIPS_RLD_MAP_REL */
6831 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6832 map
= dyn
->d_un
.d_val
;
6834 if (dyn
->d_tag
== DT_NULL
)
6838 dynamic_memaddr
+= dyn_size
;
6844 /* Read one pointer from MEMADDR in the inferior. */
6847 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6851 /* Go through a union so this works on either big or little endian
6852 hosts, when the inferior's pointer size is smaller than the size
6853 of CORE_ADDR. It is assumed the inferior's endianness is the
6854 same of the superior's. */
6857 CORE_ADDR core_addr
;
6862 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6865 if (ptr_size
== sizeof (CORE_ADDR
))
6866 *ptr
= addr
.core_addr
;
6867 else if (ptr_size
== sizeof (unsigned int))
6870 gdb_assert_not_reached ("unhandled pointer size");
6875 struct link_map_offsets
6877 /* Offset and size of r_debug.r_version. */
6878 int r_version_offset
;
6880 /* Offset and size of r_debug.r_map. */
6883 /* Offset to l_addr field in struct link_map. */
6886 /* Offset to l_name field in struct link_map. */
6889 /* Offset to l_ld field in struct link_map. */
6892 /* Offset to l_next field in struct link_map. */
6895 /* Offset to l_prev field in struct link_map. */
6899 /* Construct qXfer:libraries-svr4:read reply. */
6902 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
6903 unsigned const char *writebuf
,
6904 CORE_ADDR offset
, int len
)
6907 unsigned document_len
;
6908 struct process_info_private
*const priv
= current_process ()->priv
;
6909 char filename
[PATH_MAX
];
6912 static const struct link_map_offsets lmo_32bit_offsets
=
6914 0, /* r_version offset. */
6915 4, /* r_debug.r_map offset. */
6916 0, /* l_addr offset in link_map. */
6917 4, /* l_name offset in link_map. */
6918 8, /* l_ld offset in link_map. */
6919 12, /* l_next offset in link_map. */
6920 16 /* l_prev offset in link_map. */
6923 static const struct link_map_offsets lmo_64bit_offsets
=
6925 0, /* r_version offset. */
6926 8, /* r_debug.r_map offset. */
6927 0, /* l_addr offset in link_map. */
6928 8, /* l_name offset in link_map. */
6929 16, /* l_ld offset in link_map. */
6930 24, /* l_next offset in link_map. */
6931 32 /* l_prev offset in link_map. */
6933 const struct link_map_offsets
*lmo
;
6934 unsigned int machine
;
6936 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
6937 int allocated
= 1024;
6939 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
6940 int header_done
= 0;
6942 if (writebuf
!= NULL
)
6944 if (readbuf
== NULL
)
6947 pid
= lwpid_of (current_thread
);
6948 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
6949 is_elf64
= elf_64_file_p (filename
, &machine
);
6950 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
6951 ptr_size
= is_elf64
? 8 : 4;
6953 while (annex
[0] != '\0')
6959 sep
= strchr (annex
, '=');
6964 if (len
== 5 && startswith (annex
, "start"))
6966 else if (len
== 4 && startswith (annex
, "prev"))
6970 annex
= strchr (sep
, ';');
6977 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
6984 if (priv
->r_debug
== 0)
6985 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
6987 /* We failed to find DT_DEBUG. Such situation will not change
6988 for this inferior - do not retry it. Report it to GDB as
6989 E01, see for the reasons at the GDB solib-svr4.c side. */
6990 if (priv
->r_debug
== (CORE_ADDR
) -1)
6993 if (priv
->r_debug
!= 0)
6995 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
6996 (unsigned char *) &r_version
,
6997 sizeof (r_version
)) != 0
7000 warning ("unexpected r_debug version %d", r_version
);
7002 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7003 &lm_addr
, ptr_size
) != 0)
7005 warning ("unable to read r_map from 0x%lx",
7006 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7011 document
= (char *) xmalloc (allocated
);
7012 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7013 p
= document
+ strlen (document
);
7016 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7017 &l_name
, ptr_size
) == 0
7018 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7019 &l_addr
, ptr_size
) == 0
7020 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7021 &l_ld
, ptr_size
) == 0
7022 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7023 &l_prev
, ptr_size
) == 0
7024 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7025 &l_next
, ptr_size
) == 0)
7027 unsigned char libname
[PATH_MAX
];
7029 if (lm_prev
!= l_prev
)
7031 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7032 (long) lm_prev
, (long) l_prev
);
7036 /* Ignore the first entry even if it has valid name as the first entry
7037 corresponds to the main executable. The first entry should not be
7038 skipped if the dynamic loader was loaded late by a static executable
7039 (see solib-svr4.c parameter ignore_first). But in such case the main
7040 executable does not have PT_DYNAMIC present and this function already
7041 exited above due to failed get_r_debug. */
7044 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7049 /* Not checking for error because reading may stop before
7050 we've got PATH_MAX worth of characters. */
7052 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7053 libname
[sizeof (libname
) - 1] = '\0';
7054 if (libname
[0] != '\0')
7056 /* 6x the size for xml_escape_text below. */
7057 size_t len
= 6 * strlen ((char *) libname
);
7062 /* Terminate `<library-list-svr4'. */
7067 while (allocated
< p
- document
+ len
+ 200)
7069 /* Expand to guarantee sufficient storage. */
7070 uintptr_t document_len
= p
- document
;
7072 document
= (char *) xrealloc (document
, 2 * allocated
);
7074 p
= document
+ document_len
;
7077 name
= xml_escape_text ((char *) libname
);
7078 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7079 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7080 name
, (unsigned long) lm_addr
,
7081 (unsigned long) l_addr
, (unsigned long) l_ld
);
7092 /* Empty list; terminate `<library-list-svr4'. */
7096 strcpy (p
, "</library-list-svr4>");
7098 document_len
= strlen (document
);
7099 if (offset
< document_len
)
7100 document_len
-= offset
;
7103 if (len
> document_len
)
7106 memcpy (readbuf
, document
+ offset
, len
);
7112 #ifdef HAVE_LINUX_BTRACE
7114 /* See to_disable_btrace target method. */
7117 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7119 enum btrace_error err
;
7121 err
= linux_disable_btrace (tinfo
);
7122 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7125 /* Encode an Intel Processor Trace configuration. */
7128 linux_low_encode_pt_config (struct buffer
*buffer
,
7129 const struct btrace_data_pt_config
*config
)
7131 buffer_grow_str (buffer
, "<pt-config>\n");
7133 switch (config
->cpu
.vendor
)
7136 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7137 "model=\"%u\" stepping=\"%u\"/>\n",
7138 config
->cpu
.family
, config
->cpu
.model
,
7139 config
->cpu
.stepping
);
7146 buffer_grow_str (buffer
, "</pt-config>\n");
7149 /* Encode a raw buffer. */
7152 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7158 /* We use hex encoding - see common/rsp-low.h. */
7159 buffer_grow_str (buffer
, "<raw>\n");
7165 elem
[0] = tohex ((*data
>> 4) & 0xf);
7166 elem
[1] = tohex (*data
++ & 0xf);
7168 buffer_grow (buffer
, elem
, 2);
7171 buffer_grow_str (buffer
, "</raw>\n");
7174 /* See to_read_btrace target method. */
7177 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7178 enum btrace_read_type type
)
7180 struct btrace_data btrace
;
7181 struct btrace_block
*block
;
7182 enum btrace_error err
;
7185 btrace_data_init (&btrace
);
7187 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7188 if (err
!= BTRACE_ERR_NONE
)
7190 if (err
== BTRACE_ERR_OVERFLOW
)
7191 buffer_grow_str0 (buffer
, "E.Overflow.");
7193 buffer_grow_str0 (buffer
, "E.Generic Error.");
7198 switch (btrace
.format
)
7200 case BTRACE_FORMAT_NONE
:
7201 buffer_grow_str0 (buffer
, "E.No Trace.");
7204 case BTRACE_FORMAT_BTS
:
7205 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7206 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7209 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7211 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7212 paddress (block
->begin
), paddress (block
->end
));
7214 buffer_grow_str0 (buffer
, "</btrace>\n");
7217 case BTRACE_FORMAT_PT
:
7218 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7219 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7220 buffer_grow_str (buffer
, "<pt>\n");
7222 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7224 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7225 btrace
.variant
.pt
.size
);
7227 buffer_grow_str (buffer
, "</pt>\n");
7228 buffer_grow_str0 (buffer
, "</btrace>\n");
7232 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7236 btrace_data_fini (&btrace
);
7240 btrace_data_fini (&btrace
);
7244 /* See to_btrace_conf target method. */
7247 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7248 struct buffer
*buffer
)
7250 const struct btrace_config
*conf
;
7252 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7253 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7255 conf
= linux_btrace_conf (tinfo
);
7258 switch (conf
->format
)
7260 case BTRACE_FORMAT_NONE
:
7263 case BTRACE_FORMAT_BTS
:
7264 buffer_xml_printf (buffer
, "<bts");
7265 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7266 buffer_xml_printf (buffer
, " />\n");
7269 case BTRACE_FORMAT_PT
:
7270 buffer_xml_printf (buffer
, "<pt");
7271 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7272 buffer_xml_printf (buffer
, "/>\n");
7277 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7280 #endif /* HAVE_LINUX_BTRACE */
7282 /* See nat/linux-nat.h. */
7285 current_lwp_ptid (void)
7287 return ptid_of (current_thread
);
7290 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7293 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7295 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7296 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7298 return default_breakpoint_kind_from_pc (pcptr
);
7301 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7303 static const gdb_byte
*
7304 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7306 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7308 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7311 /* Implementation of the target_ops method
7312 "breakpoint_kind_from_current_state". */
7315 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7317 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7318 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7320 return linux_breakpoint_kind_from_pc (pcptr
);
7323 /* Default implementation of linux_target_ops method "set_pc" for
7324 32-bit pc register which is literally named "pc". */
7327 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7329 uint32_t newpc
= pc
;
7331 supply_register_by_name (regcache
, "pc", &newpc
);
7334 /* Default implementation of linux_target_ops method "get_pc" for
7335 32-bit pc register which is literally named "pc". */
7338 linux_get_pc_32bit (struct regcache
*regcache
)
7342 collect_register_by_name (regcache
, "pc", &pc
);
7344 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7348 /* Default implementation of linux_target_ops method "set_pc" for
7349 64-bit pc register which is literally named "pc". */
7352 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7354 uint64_t newpc
= pc
;
7356 supply_register_by_name (regcache
, "pc", &newpc
);
7359 /* Default implementation of linux_target_ops method "get_pc" for
7360 64-bit pc register which is literally named "pc". */
7363 linux_get_pc_64bit (struct regcache
*regcache
)
7367 collect_register_by_name (regcache
, "pc", &pc
);
7369 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7374 static struct target_ops linux_target_ops
= {
7375 linux_create_inferior
,
7376 linux_post_create_inferior
,
7385 linux_fetch_registers
,
7386 linux_store_registers
,
7387 linux_prepare_to_access_memory
,
7388 linux_done_accessing_memory
,
7391 linux_look_up_symbols
,
7392 linux_request_interrupt
,
7394 linux_supports_z_point_type
,
7397 linux_stopped_by_sw_breakpoint
,
7398 linux_supports_stopped_by_sw_breakpoint
,
7399 linux_stopped_by_hw_breakpoint
,
7400 linux_supports_stopped_by_hw_breakpoint
,
7401 linux_supports_hardware_single_step
,
7402 linux_stopped_by_watchpoint
,
7403 linux_stopped_data_address
,
7404 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7405 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7406 && defined(PT_TEXT_END_ADDR)
7411 #ifdef USE_THREAD_DB
7412 thread_db_get_tls_address
,
7417 hostio_last_error_from_errno
,
7420 linux_supports_non_stop
,
7422 linux_start_non_stop
,
7423 linux_supports_multi_process
,
7424 linux_supports_fork_events
,
7425 linux_supports_vfork_events
,
7426 linux_supports_exec_events
,
7427 linux_handle_new_gdb_connection
,
7428 #ifdef USE_THREAD_DB
7429 thread_db_handle_monitor_command
,
7433 linux_common_core_of_thread
,
7435 linux_process_qsupported
,
7436 linux_supports_tracepoints
,
7439 linux_thread_stopped
,
7443 linux_stabilize_threads
,
7444 linux_install_fast_tracepoint_jump_pad
,
7446 linux_supports_disable_randomization
,
7447 linux_get_min_fast_tracepoint_insn_len
,
7448 linux_qxfer_libraries_svr4
,
7449 linux_supports_agent
,
7450 #ifdef HAVE_LINUX_BTRACE
7451 linux_supports_btrace
,
7452 linux_enable_btrace
,
7453 linux_low_disable_btrace
,
7454 linux_low_read_btrace
,
7455 linux_low_btrace_conf
,
7463 linux_supports_range_stepping
,
7464 linux_proc_pid_to_exec_file
,
7465 linux_mntns_open_cloexec
,
7467 linux_mntns_readlink
,
7468 linux_breakpoint_kind_from_pc
,
7469 linux_sw_breakpoint_from_kind
,
7470 linux_proc_tid_get_name
,
7471 linux_breakpoint_kind_from_current_state
,
7472 linux_supports_software_single_step
,
7473 linux_supports_catch_syscall
,
7474 linux_get_ipa_tdesc_idx
,
7477 #ifdef HAVE_LINUX_REGSETS
7479 initialize_regsets_info (struct regsets_info
*info
)
7481 for (info
->num_regsets
= 0;
7482 info
->regsets
[info
->num_regsets
].size
>= 0;
7483 info
->num_regsets
++)
7489 initialize_low (void)
7491 struct sigaction sigchld_action
;
7493 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7494 set_target_ops (&linux_target_ops
);
7496 linux_ptrace_init_warnings ();
7498 sigchld_action
.sa_handler
= sigchld_handler
;
7499 sigemptyset (&sigchld_action
.sa_mask
);
7500 sigchld_action
.sa_flags
= SA_RESTART
;
7501 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7503 initialize_low_arch ();
7505 linux_check_ptrace_features ();