1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2016 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "linux-low.h"
21 #include "nat/linux-osdata.h"
26 #include "nat/linux-nat.h"
27 #include "nat/linux-waitpid.h"
29 #include "nat/gdb_ptrace.h"
30 #include "nat/linux-ptrace.h"
31 #include "nat/linux-procfs.h"
32 #include "nat/linux-personality.h"
34 #include <sys/ioctl.h>
37 #include <sys/syscall.h>
41 #include <sys/types.h>
46 #include "filestuff.h"
47 #include "tracepoint.h"
51 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
52 then ELFMAG0 will have been defined. If it didn't get included by
53 gdb_proc_service.h then including it will likely introduce a duplicate
54 definition of elf_fpregset_t. */
57 #include "nat/linux-namespaces.h"
60 #define SPUFS_MAGIC 0x23c9b64e
63 #ifdef HAVE_PERSONALITY
64 # include <sys/personality.h>
65 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
66 # define ADDR_NO_RANDOMIZE 0x0040000
74 /* Some targets did not define these ptrace constants from the start,
75 so gdbserver defines them locally here. In the future, these may
76 be removed after they are added to asm/ptrace.h. */
77 #if !(defined(PT_TEXT_ADDR) \
78 || defined(PT_DATA_ADDR) \
79 || defined(PT_TEXT_END_ADDR))
80 #if defined(__mcoldfire__)
81 /* These are still undefined in 3.10 kernels. */
82 #define PT_TEXT_ADDR 49*4
83 #define PT_DATA_ADDR 50*4
84 #define PT_TEXT_END_ADDR 51*4
85 /* BFIN already defines these since at least 2.6.32 kernels. */
87 #define PT_TEXT_ADDR 220
88 #define PT_TEXT_END_ADDR 224
89 #define PT_DATA_ADDR 228
90 /* These are still undefined in 3.10 kernels. */
91 #elif defined(__TMS320C6X__)
92 #define PT_TEXT_ADDR (0x10000*4)
93 #define PT_DATA_ADDR (0x10004*4)
94 #define PT_TEXT_END_ADDR (0x10008*4)
98 #ifdef HAVE_LINUX_BTRACE
99 # include "nat/linux-btrace.h"
100 # include "btrace-common.h"
103 #ifndef HAVE_ELF32_AUXV_T
104 /* Copied from glibc's elf.h. */
107 uint32_t a_type
; /* Entry type */
110 uint32_t a_val
; /* Integer value */
111 /* We use to have pointer elements added here. We cannot do that,
112 though, since it does not work when using 32-bit definitions
113 on 64-bit platforms and vice versa. */
118 #ifndef HAVE_ELF64_AUXV_T
119 /* Copied from glibc's elf.h. */
122 uint64_t a_type
; /* Entry type */
125 uint64_t a_val
; /* Integer value */
126 /* We use to have pointer elements added here. We cannot do that,
127 though, since it does not work when using 32-bit definitions
128 on 64-bit platforms and vice versa. */
133 /* Does the current host support PTRACE_GETREGSET? */
134 int have_ptrace_getregset
= -1;
138 /* See nat/linux-nat.h. */
141 ptid_of_lwp (struct lwp_info
*lwp
)
143 return ptid_of (get_lwp_thread (lwp
));
146 /* See nat/linux-nat.h. */
149 lwp_set_arch_private_info (struct lwp_info
*lwp
,
150 struct arch_lwp_info
*info
)
152 lwp
->arch_private
= info
;
155 /* See nat/linux-nat.h. */
157 struct arch_lwp_info
*
158 lwp_arch_private_info (struct lwp_info
*lwp
)
160 return lwp
->arch_private
;
163 /* See nat/linux-nat.h. */
166 lwp_is_stopped (struct lwp_info
*lwp
)
171 /* See nat/linux-nat.h. */
173 enum target_stop_reason
174 lwp_stop_reason (struct lwp_info
*lwp
)
176 return lwp
->stop_reason
;
179 /* A list of all unknown processes which receive stop signals. Some
180 other process will presumably claim each of these as forked
181 children momentarily. */
183 struct simple_pid_list
185 /* The process ID. */
188 /* The status as reported by waitpid. */
192 struct simple_pid_list
*next
;
194 struct simple_pid_list
*stopped_pids
;
196 /* Trivial list manipulation functions to keep track of a list of new
197 stopped processes. */
200 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
202 struct simple_pid_list
*new_pid
= XNEW (struct simple_pid_list
);
205 new_pid
->status
= status
;
206 new_pid
->next
= *listp
;
211 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
213 struct simple_pid_list
**p
;
215 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
216 if ((*p
)->pid
== pid
)
218 struct simple_pid_list
*next
= (*p
)->next
;
220 *statusp
= (*p
)->status
;
228 enum stopping_threads_kind
230 /* Not stopping threads presently. */
231 NOT_STOPPING_THREADS
,
233 /* Stopping threads. */
236 /* Stopping and suspending threads. */
237 STOPPING_AND_SUSPENDING_THREADS
240 /* This is set while stop_all_lwps is in effect. */
241 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
243 /* FIXME make into a target method? */
244 int using_threads
= 1;
246 /* True if we're presently stabilizing threads (moving them out of
248 static int stabilizing_threads
;
250 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
251 int step
, int signal
, siginfo_t
*info
);
252 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
253 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
254 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
255 static void unsuspend_all_lwps (struct lwp_info
*except
);
256 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
257 int *wstat
, int options
);
258 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
259 static struct lwp_info
*add_lwp (ptid_t ptid
);
260 static void linux_mourn (struct process_info
*process
);
261 static int linux_stopped_by_watchpoint (void);
262 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
263 static int lwp_is_marked_dead (struct lwp_info
*lwp
);
264 static void proceed_all_lwps (void);
265 static int finish_step_over (struct lwp_info
*lwp
);
266 static int kill_lwp (unsigned long lwpid
, int signo
);
267 static void enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
);
268 static void complete_ongoing_step_over (void);
269 static int linux_low_ptrace_options (int attached
);
270 static int check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
);
272 /* When the event-loop is doing a step-over, this points at the thread
274 ptid_t step_over_bkpt
;
276 /* True if the low target can hardware single-step. */
279 can_hardware_single_step (void)
281 if (the_low_target
.supports_hardware_single_step
!= NULL
)
282 return the_low_target
.supports_hardware_single_step ();
287 /* True if the low target can software single-step. Such targets
288 implement the GET_NEXT_PCS callback. */
291 can_software_single_step (void)
293 return (the_low_target
.get_next_pcs
!= NULL
);
296 /* True if the low target supports memory breakpoints. If so, we'll
297 have a GET_PC implementation. */
300 supports_breakpoints (void)
302 return (the_low_target
.get_pc
!= NULL
);
305 /* Returns true if this target can support fast tracepoints. This
306 does not mean that the in-process agent has been loaded in the
310 supports_fast_tracepoints (void)
312 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
315 /* True if LWP is stopped in its stepping range. */
318 lwp_in_step_range (struct lwp_info
*lwp
)
320 CORE_ADDR pc
= lwp
->stop_pc
;
322 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
325 struct pending_signals
329 struct pending_signals
*prev
;
332 /* The read/write ends of the pipe registered as waitable file in the
334 static int linux_event_pipe
[2] = { -1, -1 };
336 /* True if we're currently in async mode. */
337 #define target_is_async_p() (linux_event_pipe[0] != -1)
339 static void send_sigstop (struct lwp_info
*lwp
);
340 static void wait_for_sigstop (void);
342 /* Return non-zero if HEADER is a 64-bit ELF file. */
345 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
347 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
348 && header
->e_ident
[EI_MAG1
] == ELFMAG1
349 && header
->e_ident
[EI_MAG2
] == ELFMAG2
350 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
352 *machine
= header
->e_machine
;
353 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
360 /* Return non-zero if FILE is a 64-bit ELF file,
361 zero if the file is not a 64-bit ELF file,
362 and -1 if the file is not accessible or doesn't exist. */
365 elf_64_file_p (const char *file
, unsigned int *machine
)
370 fd
= open (file
, O_RDONLY
);
374 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
381 return elf_64_header_p (&header
, machine
);
384 /* Accepts an integer PID; Returns true if the executable PID is
385 running is a 64-bit ELF file.. */
388 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
392 sprintf (file
, "/proc/%d/exe", pid
);
393 return elf_64_file_p (file
, machine
);
397 delete_lwp (struct lwp_info
*lwp
)
399 struct thread_info
*thr
= get_lwp_thread (lwp
);
402 debug_printf ("deleting %ld\n", lwpid_of (thr
));
405 free (lwp
->arch_private
);
409 /* Add a process to the common process list, and set its private
412 static struct process_info
*
413 linux_add_process (int pid
, int attached
)
415 struct process_info
*proc
;
417 proc
= add_process (pid
, attached
);
418 proc
->priv
= XCNEW (struct process_info_private
);
420 if (the_low_target
.new_process
!= NULL
)
421 proc
->priv
->arch_private
= the_low_target
.new_process ();
426 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
428 /* Call the target arch_setup function on the current thread. */
431 linux_arch_setup (void)
433 the_low_target
.arch_setup ();
436 /* Call the target arch_setup function on THREAD. */
439 linux_arch_setup_thread (struct thread_info
*thread
)
441 struct thread_info
*saved_thread
;
443 saved_thread
= current_thread
;
444 current_thread
= thread
;
448 current_thread
= saved_thread
;
451 /* Handle a GNU/Linux extended wait response. If we see a clone,
452 fork, or vfork event, we need to add the new LWP to our list
453 (and return 0 so as not to report the trap to higher layers).
454 If we see an exec event, we will modify ORIG_EVENT_LWP to point
455 to a new LWP representing the new program. */
458 handle_extended_wait (struct lwp_info
**orig_event_lwp
, int wstat
)
460 struct lwp_info
*event_lwp
= *orig_event_lwp
;
461 int event
= linux_ptrace_get_extended_event (wstat
);
462 struct thread_info
*event_thr
= get_lwp_thread (event_lwp
);
463 struct lwp_info
*new_lwp
;
465 gdb_assert (event_lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
467 /* All extended events we currently use are mid-syscall. Only
468 PTRACE_EVENT_STOP is delivered more like a signal-stop, but
469 you have to be using PTRACE_SEIZE to get that. */
470 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
472 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
473 || (event
== PTRACE_EVENT_CLONE
))
476 unsigned long new_pid
;
479 /* Get the pid of the new lwp. */
480 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
483 /* If we haven't already seen the new PID stop, wait for it now. */
484 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
486 /* The new child has a pending SIGSTOP. We can't affect it until it
487 hits the SIGSTOP, but we're already attached. */
489 ret
= my_waitpid (new_pid
, &status
, __WALL
);
492 perror_with_name ("waiting for new child");
493 else if (ret
!= new_pid
)
494 warning ("wait returned unexpected PID %d", ret
);
495 else if (!WIFSTOPPED (status
))
496 warning ("wait returned unexpected status 0x%x", status
);
499 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
501 struct process_info
*parent_proc
;
502 struct process_info
*child_proc
;
503 struct lwp_info
*child_lwp
;
504 struct thread_info
*child_thr
;
505 struct target_desc
*tdesc
;
507 ptid
= ptid_build (new_pid
, new_pid
, 0);
511 debug_printf ("HEW: Got fork event from LWP %ld, "
513 ptid_get_lwp (ptid_of (event_thr
)),
514 ptid_get_pid (ptid
));
517 /* Add the new process to the tables and clone the breakpoint
518 lists of the parent. We need to do this even if the new process
519 will be detached, since we will need the process object and the
520 breakpoints to remove any breakpoints from memory when we
521 detach, and the client side will access registers. */
522 child_proc
= linux_add_process (new_pid
, 0);
523 gdb_assert (child_proc
!= NULL
);
524 child_lwp
= add_lwp (ptid
);
525 gdb_assert (child_lwp
!= NULL
);
526 child_lwp
->stopped
= 1;
527 child_lwp
->must_set_ptrace_flags
= 1;
528 child_lwp
->status_pending_p
= 0;
529 child_thr
= get_lwp_thread (child_lwp
);
530 child_thr
->last_resume_kind
= resume_stop
;
531 child_thr
->last_status
.kind
= TARGET_WAITKIND_STOPPED
;
533 /* If we're suspending all threads, leave this one suspended
534 too. If the fork/clone parent is stepping over a breakpoint,
535 all other threads have been suspended already. Leave the
536 child suspended too. */
537 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
538 || event_lwp
->bp_reinsert
!= 0)
541 debug_printf ("HEW: leaving child suspended\n");
542 child_lwp
->suspended
= 1;
545 parent_proc
= get_thread_process (event_thr
);
546 child_proc
->attached
= parent_proc
->attached
;
548 if (event_lwp
->bp_reinsert
!= 0
549 && can_software_single_step ()
550 && event
== PTRACE_EVENT_VFORK
)
552 /* If we leave reinsert breakpoints there, child will
553 hit it, so uninsert reinsert breakpoints from parent
554 (and child). Once vfork child is done, reinsert
555 them back to parent. */
556 uninsert_reinsert_breakpoints (event_thr
);
559 clone_all_breakpoints (child_thr
, event_thr
);
561 tdesc
= XNEW (struct target_desc
);
562 copy_target_description (tdesc
, parent_proc
->tdesc
);
563 child_proc
->tdesc
= tdesc
;
565 /* Clone arch-specific process data. */
566 if (the_low_target
.new_fork
!= NULL
)
567 the_low_target
.new_fork (parent_proc
, child_proc
);
569 /* Save fork info in the parent thread. */
570 if (event
== PTRACE_EVENT_FORK
)
571 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
572 else if (event
== PTRACE_EVENT_VFORK
)
573 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
575 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
577 /* The status_pending field contains bits denoting the
578 extended event, so when the pending event is handled,
579 the handler will look at lwp->waitstatus. */
580 event_lwp
->status_pending_p
= 1;
581 event_lwp
->status_pending
= wstat
;
583 /* If the parent thread is doing step-over with reinsert
584 breakpoints, the list of reinsert breakpoints are cloned
585 from the parent's. Remove them from the child process.
586 In case of vfork, we'll reinsert them back once vforked
588 if (event_lwp
->bp_reinsert
!= 0
589 && can_software_single_step ())
591 /* The child process is forked and stopped, so it is safe
592 to access its memory without stopping all other threads
593 from other processes. */
594 delete_reinsert_breakpoints (child_thr
);
596 gdb_assert (has_reinsert_breakpoints (event_thr
));
597 gdb_assert (!has_reinsert_breakpoints (child_thr
));
600 /* Report the event. */
605 debug_printf ("HEW: Got clone event "
606 "from LWP %ld, new child is LWP %ld\n",
607 lwpid_of (event_thr
), new_pid
);
609 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
610 new_lwp
= add_lwp (ptid
);
612 /* Either we're going to immediately resume the new thread
613 or leave it stopped. linux_resume_one_lwp is a nop if it
614 thinks the thread is currently running, so set this first
615 before calling linux_resume_one_lwp. */
616 new_lwp
->stopped
= 1;
618 /* If we're suspending all threads, leave this one suspended
619 too. If the fork/clone parent is stepping over a breakpoint,
620 all other threads have been suspended already. Leave the
621 child suspended too. */
622 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
623 || event_lwp
->bp_reinsert
!= 0)
624 new_lwp
->suspended
= 1;
626 /* Normally we will get the pending SIGSTOP. But in some cases
627 we might get another signal delivered to the group first.
628 If we do get another signal, be sure not to lose it. */
629 if (WSTOPSIG (status
) != SIGSTOP
)
631 new_lwp
->stop_expected
= 1;
632 new_lwp
->status_pending_p
= 1;
633 new_lwp
->status_pending
= status
;
635 else if (report_thread_events
)
637 new_lwp
->waitstatus
.kind
= TARGET_WAITKIND_THREAD_CREATED
;
638 new_lwp
->status_pending_p
= 1;
639 new_lwp
->status_pending
= status
;
642 /* Don't report the event. */
645 else if (event
== PTRACE_EVENT_VFORK_DONE
)
647 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
649 if (event_lwp
->bp_reinsert
!= 0 && can_software_single_step ())
651 reinsert_reinsert_breakpoints (event_thr
);
653 gdb_assert (has_reinsert_breakpoints (event_thr
));
656 /* Report the event. */
659 else if (event
== PTRACE_EVENT_EXEC
&& report_exec_events
)
661 struct process_info
*proc
;
662 VEC (int) *syscalls_to_catch
;
668 debug_printf ("HEW: Got exec event from LWP %ld\n",
669 lwpid_of (event_thr
));
672 /* Get the event ptid. */
673 event_ptid
= ptid_of (event_thr
);
674 event_pid
= ptid_get_pid (event_ptid
);
676 /* Save the syscall list from the execing process. */
677 proc
= get_thread_process (event_thr
);
678 syscalls_to_catch
= proc
->syscalls_to_catch
;
679 proc
->syscalls_to_catch
= NULL
;
681 /* Delete the execing process and all its threads. */
683 current_thread
= NULL
;
685 /* Create a new process/lwp/thread. */
686 proc
= linux_add_process (event_pid
, 0);
687 event_lwp
= add_lwp (event_ptid
);
688 event_thr
= get_lwp_thread (event_lwp
);
689 gdb_assert (current_thread
== event_thr
);
690 linux_arch_setup_thread (event_thr
);
692 /* Set the event status. */
693 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
694 event_lwp
->waitstatus
.value
.execd_pathname
695 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
697 /* Mark the exec status as pending. */
698 event_lwp
->stopped
= 1;
699 event_lwp
->status_pending_p
= 1;
700 event_lwp
->status_pending
= wstat
;
701 event_thr
->last_resume_kind
= resume_continue
;
702 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
704 /* Update syscall state in the new lwp, effectively mid-syscall too. */
705 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
707 /* Restore the list to catch. Don't rely on the client, which is free
708 to avoid sending a new list when the architecture doesn't change.
709 Also, for ANY_SYSCALL, the architecture doesn't really matter. */
710 proc
->syscalls_to_catch
= syscalls_to_catch
;
712 /* Report the event. */
713 *orig_event_lwp
= event_lwp
;
717 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
720 /* Return the PC as read from the regcache of LWP, without any
724 get_pc (struct lwp_info
*lwp
)
726 struct thread_info
*saved_thread
;
727 struct regcache
*regcache
;
730 if (the_low_target
.get_pc
== NULL
)
733 saved_thread
= current_thread
;
734 current_thread
= get_lwp_thread (lwp
);
736 regcache
= get_thread_regcache (current_thread
, 1);
737 pc
= (*the_low_target
.get_pc
) (regcache
);
740 debug_printf ("pc is 0x%lx\n", (long) pc
);
742 current_thread
= saved_thread
;
746 /* This function should only be called if LWP got a SYSCALL_SIGTRAP.
747 Fill *SYSNO with the syscall nr trapped. */
750 get_syscall_trapinfo (struct lwp_info
*lwp
, int *sysno
)
752 struct thread_info
*saved_thread
;
753 struct regcache
*regcache
;
755 if (the_low_target
.get_syscall_trapinfo
== NULL
)
757 /* If we cannot get the syscall trapinfo, report an unknown
758 system call number. */
759 *sysno
= UNKNOWN_SYSCALL
;
763 saved_thread
= current_thread
;
764 current_thread
= get_lwp_thread (lwp
);
766 regcache
= get_thread_regcache (current_thread
, 1);
767 (*the_low_target
.get_syscall_trapinfo
) (regcache
, sysno
);
770 debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno
);
772 current_thread
= saved_thread
;
775 static int check_stopped_by_watchpoint (struct lwp_info
*child
);
777 /* Called when the LWP stopped for a signal/trap. If it stopped for a
778 trap check what caused it (breakpoint, watchpoint, trace, etc.),
779 and save the result in the LWP's stop_reason field. If it stopped
780 for a breakpoint, decrement the PC if necessary on the lwp's
781 architecture. Returns true if we now have the LWP's stop PC. */
784 save_stop_reason (struct lwp_info
*lwp
)
787 CORE_ADDR sw_breakpoint_pc
;
788 struct thread_info
*saved_thread
;
789 #if USE_SIGTRAP_SIGINFO
793 if (the_low_target
.get_pc
== NULL
)
797 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
799 /* breakpoint_at reads from the current thread. */
800 saved_thread
= current_thread
;
801 current_thread
= get_lwp_thread (lwp
);
803 #if USE_SIGTRAP_SIGINFO
804 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
805 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
807 if (siginfo
.si_signo
== SIGTRAP
)
809 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
)
810 && GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
812 /* The si_code is ambiguous on this arch -- check debug
814 if (!check_stopped_by_watchpoint (lwp
))
815 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
817 else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
819 /* If we determine the LWP stopped for a SW breakpoint,
820 trust it. Particularly don't check watchpoint
821 registers, because at least on s390, we'd find
822 stopped-by-watchpoint as long as there's a watchpoint
824 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
826 else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
828 /* This can indicate either a hardware breakpoint or
829 hardware watchpoint. Check debug registers. */
830 if (!check_stopped_by_watchpoint (lwp
))
831 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
833 else if (siginfo
.si_code
== TRAP_TRACE
)
835 /* We may have single stepped an instruction that
836 triggered a watchpoint. In that case, on some
837 architectures (such as x86), instead of TRAP_HWBKPT,
838 si_code indicates TRAP_TRACE, and we need to check
839 the debug registers separately. */
840 if (!check_stopped_by_watchpoint (lwp
))
841 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
846 /* We may have just stepped a breakpoint instruction. E.g., in
847 non-stop mode, GDB first tells the thread A to step a range, and
848 then the user inserts a breakpoint inside the range. In that
849 case we need to report the breakpoint PC. */
850 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
851 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
852 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
854 if (hardware_breakpoint_inserted_here (pc
))
855 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
857 if (lwp
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
)
858 check_stopped_by_watchpoint (lwp
);
861 if (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
865 struct thread_info
*thr
= get_lwp_thread (lwp
);
867 debug_printf ("CSBB: %s stopped by software breakpoint\n",
868 target_pid_to_str (ptid_of (thr
)));
871 /* Back up the PC if necessary. */
872 if (pc
!= sw_breakpoint_pc
)
874 struct regcache
*regcache
875 = get_thread_regcache (current_thread
, 1);
876 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
879 /* Update this so we record the correct stop PC below. */
880 pc
= sw_breakpoint_pc
;
882 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
)
886 struct thread_info
*thr
= get_lwp_thread (lwp
);
888 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
889 target_pid_to_str (ptid_of (thr
)));
892 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
896 struct thread_info
*thr
= get_lwp_thread (lwp
);
898 debug_printf ("CSBB: %s stopped by hardware watchpoint\n",
899 target_pid_to_str (ptid_of (thr
)));
902 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
)
906 struct thread_info
*thr
= get_lwp_thread (lwp
);
908 debug_printf ("CSBB: %s stopped by trace\n",
909 target_pid_to_str (ptid_of (thr
)));
914 current_thread
= saved_thread
;
918 static struct lwp_info
*
919 add_lwp (ptid_t ptid
)
921 struct lwp_info
*lwp
;
923 lwp
= XCNEW (struct lwp_info
);
925 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
927 if (the_low_target
.new_thread
!= NULL
)
928 the_low_target
.new_thread (lwp
);
930 lwp
->thread
= add_thread (ptid
, lwp
);
935 /* Start an inferior process and returns its pid.
936 ALLARGS is a vector of program-name and args. */
939 linux_create_inferior (char *program
, char **allargs
)
941 struct lwp_info
*new_lwp
;
944 struct cleanup
*restore_personality
945 = maybe_disable_address_space_randomization (disable_randomization
);
947 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
953 perror_with_name ("fork");
958 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
962 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
963 stdout to stderr so that inferior i/o doesn't corrupt the connection.
964 Also, redirect stdin to /dev/null. */
965 if (remote_connection_is_stdio ())
968 open ("/dev/null", O_RDONLY
);
970 if (write (2, "stdin/stdout redirected\n",
971 sizeof ("stdin/stdout redirected\n") - 1) < 0)
973 /* Errors ignored. */;
977 execv (program
, allargs
);
979 execvp (program
, allargs
);
981 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
987 do_cleanups (restore_personality
);
989 linux_add_process (pid
, 0);
991 ptid
= ptid_build (pid
, pid
, 0);
992 new_lwp
= add_lwp (ptid
);
993 new_lwp
->must_set_ptrace_flags
= 1;
998 /* Implement the post_create_inferior target_ops method. */
1001 linux_post_create_inferior (void)
1003 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
1005 linux_arch_setup ();
1007 if (lwp
->must_set_ptrace_flags
)
1009 struct process_info
*proc
= current_process ();
1010 int options
= linux_low_ptrace_options (proc
->attached
);
1012 linux_enable_event_reporting (lwpid_of (current_thread
), options
);
1013 lwp
->must_set_ptrace_flags
= 0;
1017 /* Attach to an inferior process. Returns 0 on success, ERRNO on
1021 linux_attach_lwp (ptid_t ptid
)
1023 struct lwp_info
*new_lwp
;
1024 int lwpid
= ptid_get_lwp (ptid
);
1026 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
1030 new_lwp
= add_lwp (ptid
);
1032 /* We need to wait for SIGSTOP before being able to make the next
1033 ptrace call on this LWP. */
1034 new_lwp
->must_set_ptrace_flags
= 1;
1036 if (linux_proc_pid_is_stopped (lwpid
))
1039 debug_printf ("Attached to a stopped process\n");
1041 /* The process is definitely stopped. It is in a job control
1042 stop, unless the kernel predates the TASK_STOPPED /
1043 TASK_TRACED distinction, in which case it might be in a
1044 ptrace stop. Make sure it is in a ptrace stop; from there we
1045 can kill it, signal it, et cetera.
1047 First make sure there is a pending SIGSTOP. Since we are
1048 already attached, the process can not transition from stopped
1049 to running without a PTRACE_CONT; so we know this signal will
1050 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1051 probably already in the queue (unless this kernel is old
1052 enough to use TASK_STOPPED for ptrace stops); but since
1053 SIGSTOP is not an RT signal, it can only be queued once. */
1054 kill_lwp (lwpid
, SIGSTOP
);
1056 /* Finally, resume the stopped process. This will deliver the
1057 SIGSTOP (or a higher priority signal, just like normal
1058 PTRACE_ATTACH), which we'll catch later on. */
1059 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1062 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
1063 brings it to a halt.
1065 There are several cases to consider here:
1067 1) gdbserver has already attached to the process and is being notified
1068 of a new thread that is being created.
1069 In this case we should ignore that SIGSTOP and resume the
1070 process. This is handled below by setting stop_expected = 1,
1071 and the fact that add_thread sets last_resume_kind ==
1074 2) This is the first thread (the process thread), and we're attaching
1075 to it via attach_inferior.
1076 In this case we want the process thread to stop.
1077 This is handled by having linux_attach set last_resume_kind ==
1078 resume_stop after we return.
1080 If the pid we are attaching to is also the tgid, we attach to and
1081 stop all the existing threads. Otherwise, we attach to pid and
1082 ignore any other threads in the same group as this pid.
1084 3) GDB is connecting to gdbserver and is requesting an enumeration of all
1086 In this case we want the thread to stop.
1087 FIXME: This case is currently not properly handled.
1088 We should wait for the SIGSTOP but don't. Things work apparently
1089 because enough time passes between when we ptrace (ATTACH) and when
1090 gdb makes the next ptrace call on the thread.
1092 On the other hand, if we are currently trying to stop all threads, we
1093 should treat the new thread as if we had sent it a SIGSTOP. This works
1094 because we are guaranteed that the add_lwp call above added us to the
1095 end of the list, and so the new thread has not yet reached
1096 wait_for_sigstop (but will). */
1097 new_lwp
->stop_expected
= 1;
1102 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
1103 already attached. Returns true if a new LWP is found, false
1107 attach_proc_task_lwp_callback (ptid_t ptid
)
1109 /* Is this a new thread? */
1110 if (find_thread_ptid (ptid
) == NULL
)
1112 int lwpid
= ptid_get_lwp (ptid
);
1116 debug_printf ("Found new lwp %d\n", lwpid
);
1118 err
= linux_attach_lwp (ptid
);
1120 /* Be quiet if we simply raced with the thread exiting. EPERM
1121 is returned if the thread's task still exists, and is marked
1122 as exited or zombie, as well as other conditions, so in that
1123 case, confirm the status in /proc/PID/status. */
1125 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1129 debug_printf ("Cannot attach to lwp %d: "
1130 "thread is gone (%d: %s)\n",
1131 lwpid
, err
, strerror (err
));
1136 warning (_("Cannot attach to lwp %d: %s"),
1138 linux_ptrace_attach_fail_reason_string (ptid
, err
));
1146 static void async_file_mark (void);
1148 /* Attach to PID. If PID is the tgid, attach to it and all
1152 linux_attach (unsigned long pid
)
1154 struct process_info
*proc
;
1155 struct thread_info
*initial_thread
;
1156 ptid_t ptid
= ptid_build (pid
, pid
, 0);
1159 /* Attach to PID. We will check for other threads
1161 err
= linux_attach_lwp (ptid
);
1163 error ("Cannot attach to process %ld: %s",
1164 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
1166 proc
= linux_add_process (pid
, 1);
1168 /* Don't ignore the initial SIGSTOP if we just attached to this
1169 process. It will be collected by wait shortly. */
1170 initial_thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
1171 initial_thread
->last_resume_kind
= resume_stop
;
1173 /* We must attach to every LWP. If /proc is mounted, use that to
1174 find them now. On the one hand, the inferior may be using raw
1175 clone instead of using pthreads. On the other hand, even if it
1176 is using pthreads, GDB may not be connected yet (thread_db needs
1177 to do symbol lookups, through qSymbol). Also, thread_db walks
1178 structures in the inferior's address space to find the list of
1179 threads/LWPs, and those structures may well be corrupted. Note
1180 that once thread_db is loaded, we'll still use it to list threads
1181 and associate pthread info with each LWP. */
1182 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1184 /* GDB will shortly read the xml target description for this
1185 process, to figure out the process' architecture. But the target
1186 description is only filled in when the first process/thread in
1187 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1188 that now, otherwise, if GDB is fast enough, it could read the
1189 target description _before_ that initial stop. */
1192 struct lwp_info
*lwp
;
1194 ptid_t pid_ptid
= pid_to_ptid (pid
);
1196 lwpid
= linux_wait_for_event_filtered (pid_ptid
, pid_ptid
,
1198 gdb_assert (lwpid
> 0);
1200 lwp
= find_lwp_pid (pid_to_ptid (lwpid
));
1202 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGSTOP
)
1204 lwp
->status_pending_p
= 1;
1205 lwp
->status_pending
= wstat
;
1208 initial_thread
->last_resume_kind
= resume_continue
;
1212 gdb_assert (proc
->tdesc
!= NULL
);
1225 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
1227 struct counter
*counter
= (struct counter
*) args
;
1229 if (ptid_get_pid (entry
->id
) == counter
->pid
)
1231 if (++counter
->count
> 1)
1239 last_thread_of_process_p (int pid
)
1241 struct counter counter
= { pid
, 0 };
1243 return (find_inferior (&all_threads
,
1244 second_thread_of_pid_p
, &counter
) == NULL
);
1250 linux_kill_one_lwp (struct lwp_info
*lwp
)
1252 struct thread_info
*thr
= get_lwp_thread (lwp
);
1253 int pid
= lwpid_of (thr
);
1255 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1256 there is no signal context, and ptrace(PTRACE_KILL) (or
1257 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1258 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1259 alternative is to kill with SIGKILL. We only need one SIGKILL
1260 per process, not one for each thread. But since we still support
1261 support debugging programs using raw clone without CLONE_THREAD,
1262 we send one for each thread. For years, we used PTRACE_KILL
1263 only, so we're being a bit paranoid about some old kernels where
1264 PTRACE_KILL might work better (dubious if there are any such, but
1265 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1266 second, and so we're fine everywhere. */
1269 kill_lwp (pid
, SIGKILL
);
1272 int save_errno
= errno
;
1274 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1275 target_pid_to_str (ptid_of (thr
)),
1276 save_errno
? strerror (save_errno
) : "OK");
1280 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1283 int save_errno
= errno
;
1285 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1286 target_pid_to_str (ptid_of (thr
)),
1287 save_errno
? strerror (save_errno
) : "OK");
1291 /* Kill LWP and wait for it to die. */
1294 kill_wait_lwp (struct lwp_info
*lwp
)
1296 struct thread_info
*thr
= get_lwp_thread (lwp
);
1297 int pid
= ptid_get_pid (ptid_of (thr
));
1298 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1303 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1307 linux_kill_one_lwp (lwp
);
1309 /* Make sure it died. Notes:
1311 - The loop is most likely unnecessary.
1313 - We don't use linux_wait_for_event as that could delete lwps
1314 while we're iterating over them. We're not interested in
1315 any pending status at this point, only in making sure all
1316 wait status on the kernel side are collected until the
1319 - We don't use __WALL here as the __WALL emulation relies on
1320 SIGCHLD, and killing a stopped process doesn't generate
1321 one, nor an exit status.
1323 res
= my_waitpid (lwpid
, &wstat
, 0);
1324 if (res
== -1 && errno
== ECHILD
)
1325 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1326 } while (res
> 0 && WIFSTOPPED (wstat
));
1328 /* Even if it was stopped, the child may have already disappeared.
1329 E.g., if it was killed by SIGKILL. */
1330 if (res
< 0 && errno
!= ECHILD
)
1331 perror_with_name ("kill_wait_lwp");
1334 /* Callback for `find_inferior'. Kills an lwp of a given process,
1335 except the leader. */
1338 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1340 struct thread_info
*thread
= (struct thread_info
*) entry
;
1341 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1342 int pid
= * (int *) args
;
1344 if (ptid_get_pid (entry
->id
) != pid
)
1347 /* We avoid killing the first thread here, because of a Linux kernel (at
1348 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1349 the children get a chance to be reaped, it will remain a zombie
1352 if (lwpid_of (thread
) == pid
)
1355 debug_printf ("lkop: is last of process %s\n",
1356 target_pid_to_str (entry
->id
));
1360 kill_wait_lwp (lwp
);
1365 linux_kill (int pid
)
1367 struct process_info
*process
;
1368 struct lwp_info
*lwp
;
1370 process
= find_process_pid (pid
);
1371 if (process
== NULL
)
1374 /* If we're killing a running inferior, make sure it is stopped
1375 first, as PTRACE_KILL will not work otherwise. */
1376 stop_all_lwps (0, NULL
);
1378 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1380 /* See the comment in linux_kill_one_lwp. We did not kill the first
1381 thread in the list, so do so now. */
1382 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1387 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1391 kill_wait_lwp (lwp
);
1393 the_target
->mourn (process
);
1395 /* Since we presently can only stop all lwps of all processes, we
1396 need to unstop lwps of other processes. */
1397 unstop_all_lwps (0, NULL
);
1401 /* Get pending signal of THREAD, for detaching purposes. This is the
1402 signal the thread last stopped for, which we need to deliver to the
1403 thread when detaching, otherwise, it'd be suppressed/lost. */
1406 get_detach_signal (struct thread_info
*thread
)
1408 enum gdb_signal signo
= GDB_SIGNAL_0
;
1410 struct lwp_info
*lp
= get_thread_lwp (thread
);
1412 if (lp
->status_pending_p
)
1413 status
= lp
->status_pending
;
1416 /* If the thread had been suspended by gdbserver, and it stopped
1417 cleanly, then it'll have stopped with SIGSTOP. But we don't
1418 want to deliver that SIGSTOP. */
1419 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1420 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1423 /* Otherwise, we may need to deliver the signal we
1425 status
= lp
->last_status
;
1428 if (!WIFSTOPPED (status
))
1431 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1432 target_pid_to_str (ptid_of (thread
)));
1436 /* Extended wait statuses aren't real SIGTRAPs. */
1437 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1440 debug_printf ("GPS: lwp %s had stopped with extended "
1441 "status: no pending signal\n",
1442 target_pid_to_str (ptid_of (thread
)));
1446 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1448 if (program_signals_p
&& !program_signals
[signo
])
1451 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1452 target_pid_to_str (ptid_of (thread
)),
1453 gdb_signal_to_string (signo
));
1456 else if (!program_signals_p
1457 /* If we have no way to know which signals GDB does not
1458 want to have passed to the program, assume
1459 SIGTRAP/SIGINT, which is GDB's default. */
1460 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1463 debug_printf ("GPS: lwp %s had signal %s, "
1464 "but we don't know if we should pass it. "
1465 "Default to not.\n",
1466 target_pid_to_str (ptid_of (thread
)),
1467 gdb_signal_to_string (signo
));
1473 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1474 target_pid_to_str (ptid_of (thread
)),
1475 gdb_signal_to_string (signo
));
1477 return WSTOPSIG (status
);
1481 /* Detach from LWP. */
1484 linux_detach_one_lwp (struct lwp_info
*lwp
)
1486 struct thread_info
*thread
= get_lwp_thread (lwp
);
1490 /* If there is a pending SIGSTOP, get rid of it. */
1491 if (lwp
->stop_expected
)
1494 debug_printf ("Sending SIGCONT to %s\n",
1495 target_pid_to_str (ptid_of (thread
)));
1497 kill_lwp (lwpid_of (thread
), SIGCONT
);
1498 lwp
->stop_expected
= 0;
1501 /* Pass on any pending signal for this thread. */
1502 sig
= get_detach_signal (thread
);
1504 /* Preparing to resume may try to write registers, and fail if the
1505 lwp is zombie. If that happens, ignore the error. We'll handle
1506 it below, when detach fails with ESRCH. */
1509 /* Flush any pending changes to the process's registers. */
1510 regcache_invalidate_thread (thread
);
1512 /* Finally, let it resume. */
1513 if (the_low_target
.prepare_to_resume
!= NULL
)
1514 the_low_target
.prepare_to_resume (lwp
);
1516 CATCH (ex
, RETURN_MASK_ERROR
)
1518 if (!check_ptrace_stopped_lwp_gone (lwp
))
1519 throw_exception (ex
);
1523 lwpid
= lwpid_of (thread
);
1524 if (ptrace (PTRACE_DETACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0,
1525 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1527 int save_errno
= errno
;
1529 /* We know the thread exists, so ESRCH must mean the lwp is
1530 zombie. This can happen if one of the already-detached
1531 threads exits the whole thread group. In that case we're
1532 still attached, and must reap the lwp. */
1533 if (save_errno
== ESRCH
)
1537 ret
= my_waitpid (lwpid
, &status
, __WALL
);
1540 warning (_("Couldn't reap LWP %d while detaching: %s"),
1541 lwpid
, strerror (errno
));
1543 else if (!WIFEXITED (status
) && !WIFSIGNALED (status
))
1545 warning (_("Reaping LWP %d while detaching "
1546 "returned unexpected status 0x%x"),
1552 error (_("Can't detach %s: %s"),
1553 target_pid_to_str (ptid_of (thread
)),
1554 strerror (save_errno
));
1557 else if (debug_threads
)
1559 debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n",
1560 target_pid_to_str (ptid_of (thread
)),
1567 /* Callback for find_inferior. Detaches from non-leader threads of a
1571 linux_detach_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1573 struct thread_info
*thread
= (struct thread_info
*) entry
;
1574 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1575 int pid
= *(int *) args
;
1576 int lwpid
= lwpid_of (thread
);
1578 /* Skip other processes. */
1579 if (ptid_get_pid (entry
->id
) != pid
)
1582 /* We don't actually detach from the thread group leader just yet.
1583 If the thread group exits, we must reap the zombie clone lwps
1584 before we're able to reap the leader. */
1585 if (ptid_get_pid (entry
->id
) == lwpid
)
1588 linux_detach_one_lwp (lwp
);
1593 linux_detach (int pid
)
1595 struct process_info
*process
;
1596 struct lwp_info
*main_lwp
;
1598 process
= find_process_pid (pid
);
1599 if (process
== NULL
)
1602 /* As there's a step over already in progress, let it finish first,
1603 otherwise nesting a stabilize_threads operation on top gets real
1605 complete_ongoing_step_over ();
1607 /* Stop all threads before detaching. First, ptrace requires that
1608 the thread is stopped to sucessfully detach. Second, thread_db
1609 may need to uninstall thread event breakpoints from memory, which
1610 only works with a stopped process anyway. */
1611 stop_all_lwps (0, NULL
);
1613 #ifdef USE_THREAD_DB
1614 thread_db_detach (process
);
1617 /* Stabilize threads (move out of jump pads). */
1618 stabilize_threads ();
1620 /* Detach from the clone lwps first. If the thread group exits just
1621 while we're detaching, we must reap the clone lwps before we're
1622 able to reap the leader. */
1623 find_inferior (&all_threads
, linux_detach_lwp_callback
, &pid
);
1625 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1626 linux_detach_one_lwp (main_lwp
);
1628 the_target
->mourn (process
);
1630 /* Since we presently can only stop all lwps of all processes, we
1631 need to unstop lwps of other processes. */
1632 unstop_all_lwps (0, NULL
);
1636 /* Remove all LWPs that belong to process PROC from the lwp list. */
1639 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1641 struct thread_info
*thread
= (struct thread_info
*) entry
;
1642 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1643 struct process_info
*process
= (struct process_info
*) proc
;
1645 if (pid_of (thread
) == pid_of (process
))
1652 linux_mourn (struct process_info
*process
)
1654 struct process_info_private
*priv
;
1656 #ifdef USE_THREAD_DB
1657 thread_db_mourn (process
);
1660 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1662 /* Freeing all private data. */
1663 priv
= process
->priv
;
1664 free (priv
->arch_private
);
1666 process
->priv
= NULL
;
1668 remove_process (process
);
1672 linux_join (int pid
)
1677 ret
= my_waitpid (pid
, &status
, 0);
1678 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1680 } while (ret
!= -1 || errno
!= ECHILD
);
1683 /* Return nonzero if the given thread is still alive. */
1685 linux_thread_alive (ptid_t ptid
)
1687 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1689 /* We assume we always know if a thread exits. If a whole process
1690 exited but we still haven't been able to report it to GDB, we'll
1691 hold on to the last lwp of the dead process. */
1693 return !lwp_is_marked_dead (lwp
);
1698 /* Return 1 if this lwp still has an interesting status pending. If
1699 not (e.g., it had stopped for a breakpoint that is gone), return
1703 thread_still_has_status_pending_p (struct thread_info
*thread
)
1705 struct lwp_info
*lp
= get_thread_lwp (thread
);
1707 if (!lp
->status_pending_p
)
1710 if (thread
->last_resume_kind
!= resume_stop
1711 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1712 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1714 struct thread_info
*saved_thread
;
1718 gdb_assert (lp
->last_status
!= 0);
1722 saved_thread
= current_thread
;
1723 current_thread
= thread
;
1725 if (pc
!= lp
->stop_pc
)
1728 debug_printf ("PC of %ld changed\n",
1733 #if !USE_SIGTRAP_SIGINFO
1734 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1735 && !(*the_low_target
.breakpoint_at
) (pc
))
1738 debug_printf ("previous SW breakpoint of %ld gone\n",
1742 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1743 && !hardware_breakpoint_inserted_here (pc
))
1746 debug_printf ("previous HW breakpoint of %ld gone\n",
1752 current_thread
= saved_thread
;
1757 debug_printf ("discarding pending breakpoint status\n");
1758 lp
->status_pending_p
= 0;
1766 /* Returns true if LWP is resumed from the client's perspective. */
1769 lwp_resumed (struct lwp_info
*lwp
)
1771 struct thread_info
*thread
= get_lwp_thread (lwp
);
1773 if (thread
->last_resume_kind
!= resume_stop
)
1776 /* Did gdb send us a `vCont;t', but we haven't reported the
1777 corresponding stop to gdb yet? If so, the thread is still
1778 resumed/running from gdb's perspective. */
1779 if (thread
->last_resume_kind
== resume_stop
1780 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1786 /* Return 1 if this lwp has an interesting status pending. */
1788 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1790 struct thread_info
*thread
= (struct thread_info
*) entry
;
1791 struct lwp_info
*lp
= get_thread_lwp (thread
);
1792 ptid_t ptid
= * (ptid_t
*) arg
;
1794 /* Check if we're only interested in events from a specific process
1795 or a specific LWP. */
1796 if (!ptid_match (ptid_of (thread
), ptid
))
1799 if (!lwp_resumed (lp
))
1802 if (lp
->status_pending_p
1803 && !thread_still_has_status_pending_p (thread
))
1805 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1809 return lp
->status_pending_p
;
1813 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1815 ptid_t ptid
= *(ptid_t
*) data
;
1818 if (ptid_get_lwp (ptid
) != 0)
1819 lwp
= ptid_get_lwp (ptid
);
1821 lwp
= ptid_get_pid (ptid
);
1823 if (ptid_get_lwp (entry
->id
) == lwp
)
1830 find_lwp_pid (ptid_t ptid
)
1832 struct inferior_list_entry
*thread
1833 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1838 return get_thread_lwp ((struct thread_info
*) thread
);
1841 /* Return the number of known LWPs in the tgid given by PID. */
1846 struct inferior_list_entry
*inf
, *tmp
;
1849 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1851 if (ptid_get_pid (inf
->id
) == pid
)
1858 /* The arguments passed to iterate_over_lwps. */
1860 struct iterate_over_lwps_args
1862 /* The FILTER argument passed to iterate_over_lwps. */
1865 /* The CALLBACK argument passed to iterate_over_lwps. */
1866 iterate_over_lwps_ftype
*callback
;
1868 /* The DATA argument passed to iterate_over_lwps. */
1872 /* Callback for find_inferior used by iterate_over_lwps to filter
1873 calls to the callback supplied to that function. Returning a
1874 nonzero value causes find_inferiors to stop iterating and return
1875 the current inferior_list_entry. Returning zero indicates that
1876 find_inferiors should continue iterating. */
1879 iterate_over_lwps_filter (struct inferior_list_entry
*entry
, void *args_p
)
1881 struct iterate_over_lwps_args
*args
1882 = (struct iterate_over_lwps_args
*) args_p
;
1884 if (ptid_match (entry
->id
, args
->filter
))
1886 struct thread_info
*thr
= (struct thread_info
*) entry
;
1887 struct lwp_info
*lwp
= get_thread_lwp (thr
);
1889 return (*args
->callback
) (lwp
, args
->data
);
1895 /* See nat/linux-nat.h. */
1898 iterate_over_lwps (ptid_t filter
,
1899 iterate_over_lwps_ftype callback
,
1902 struct iterate_over_lwps_args args
= {filter
, callback
, data
};
1903 struct inferior_list_entry
*entry
;
1905 entry
= find_inferior (&all_threads
, iterate_over_lwps_filter
, &args
);
1909 return get_thread_lwp ((struct thread_info
*) entry
);
1912 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1913 their exits until all other threads in the group have exited. */
1916 check_zombie_leaders (void)
1918 struct process_info
*proc
, *tmp
;
1920 ALL_PROCESSES (proc
, tmp
)
1922 pid_t leader_pid
= pid_of (proc
);
1923 struct lwp_info
*leader_lp
;
1925 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1928 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1929 "num_lwps=%d, zombie=%d\n",
1930 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1931 linux_proc_pid_is_zombie (leader_pid
));
1933 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1934 /* Check if there are other threads in the group, as we may
1935 have raced with the inferior simply exiting. */
1936 && !last_thread_of_process_p (leader_pid
)
1937 && linux_proc_pid_is_zombie (leader_pid
))
1939 /* A leader zombie can mean one of two things:
1941 - It exited, and there's an exit status pending
1942 available, or only the leader exited (not the whole
1943 program). In the latter case, we can't waitpid the
1944 leader's exit status until all other threads are gone.
1946 - There are 3 or more threads in the group, and a thread
1947 other than the leader exec'd. On an exec, the Linux
1948 kernel destroys all other threads (except the execing
1949 one) in the thread group, and resets the execing thread's
1950 tid to the tgid. No exit notification is sent for the
1951 execing thread -- from the ptracer's perspective, it
1952 appears as though the execing thread just vanishes.
1953 Until we reap all other threads except the leader and the
1954 execing thread, the leader will be zombie, and the
1955 execing thread will be in `D (disc sleep)'. As soon as
1956 all other threads are reaped, the execing thread changes
1957 it's tid to the tgid, and the previous (zombie) leader
1958 vanishes, giving place to the "new" leader. We could try
1959 distinguishing the exit and exec cases, by waiting once
1960 more, and seeing if something comes out, but it doesn't
1961 sound useful. The previous leader _does_ go away, and
1962 we'll re-add the new one once we see the exec event
1963 (which is just the same as what would happen if the
1964 previous leader did exit voluntarily before some other
1969 "CZL: Thread group leader %d zombie "
1970 "(it exited, or another thread execd).\n",
1973 delete_lwp (leader_lp
);
1978 /* Callback for `find_inferior'. Returns the first LWP that is not
1979 stopped. ARG is a PTID filter. */
1982 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
1984 struct thread_info
*thr
= (struct thread_info
*) entry
;
1985 struct lwp_info
*lwp
;
1986 ptid_t filter
= *(ptid_t
*) arg
;
1988 if (!ptid_match (ptid_of (thr
), filter
))
1991 lwp
= get_thread_lwp (thr
);
1998 /* Increment LWP's suspend count. */
2001 lwp_suspended_inc (struct lwp_info
*lwp
)
2005 if (debug_threads
&& lwp
->suspended
> 4)
2007 struct thread_info
*thread
= get_lwp_thread (lwp
);
2009 debug_printf ("LWP %ld has a suspiciously high suspend count,"
2010 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
2014 /* Decrement LWP's suspend count. */
2017 lwp_suspended_decr (struct lwp_info
*lwp
)
2021 if (lwp
->suspended
< 0)
2023 struct thread_info
*thread
= get_lwp_thread (lwp
);
2025 internal_error (__FILE__
, __LINE__
,
2026 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
2031 /* This function should only be called if the LWP got a SIGTRAP.
2033 Handle any tracepoint steps or hits. Return true if a tracepoint
2034 event was handled, 0 otherwise. */
2037 handle_tracepoints (struct lwp_info
*lwp
)
2039 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
2040 int tpoint_related_event
= 0;
2042 gdb_assert (lwp
->suspended
== 0);
2044 /* If this tracepoint hit causes a tracing stop, we'll immediately
2045 uninsert tracepoints. To do this, we temporarily pause all
2046 threads, unpatch away, and then unpause threads. We need to make
2047 sure the unpausing doesn't resume LWP too. */
2048 lwp_suspended_inc (lwp
);
2050 /* And we need to be sure that any all-threads-stopping doesn't try
2051 to move threads out of the jump pads, as it could deadlock the
2052 inferior (LWP could be in the jump pad, maybe even holding the
2055 /* Do any necessary step collect actions. */
2056 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2058 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2060 /* See if we just hit a tracepoint and do its main collect
2062 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2064 lwp_suspended_decr (lwp
);
2066 gdb_assert (lwp
->suspended
== 0);
2067 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
2069 if (tpoint_related_event
)
2072 debug_printf ("got a tracepoint event\n");
2079 /* Convenience wrapper. Returns true if LWP is presently collecting a
2083 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2084 struct fast_tpoint_collect_status
*status
)
2086 CORE_ADDR thread_area
;
2087 struct thread_info
*thread
= get_lwp_thread (lwp
);
2089 if (the_low_target
.get_thread_area
== NULL
)
2092 /* Get the thread area address. This is used to recognize which
2093 thread is which when tracing with the in-process agent library.
2094 We don't read anything from the address, and treat it as opaque;
2095 it's the address itself that we assume is unique per-thread. */
2096 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2099 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2102 /* The reason we resume in the caller, is because we want to be able
2103 to pass lwp->status_pending as WSTAT, and we need to clear
2104 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2105 refuses to resume. */
2108 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2110 struct thread_info
*saved_thread
;
2112 saved_thread
= current_thread
;
2113 current_thread
= get_lwp_thread (lwp
);
2116 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2117 && supports_fast_tracepoints ()
2118 && agent_loaded_p ())
2120 struct fast_tpoint_collect_status status
;
2124 debug_printf ("Checking whether LWP %ld needs to move out of the "
2126 lwpid_of (current_thread
));
2128 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
2131 || (WSTOPSIG (*wstat
) != SIGILL
2132 && WSTOPSIG (*wstat
) != SIGFPE
2133 && WSTOPSIG (*wstat
) != SIGSEGV
2134 && WSTOPSIG (*wstat
) != SIGBUS
))
2136 lwp
->collecting_fast_tracepoint
= r
;
2140 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
2142 /* Haven't executed the original instruction yet.
2143 Set breakpoint there, and wait till it's hit,
2144 then single-step until exiting the jump pad. */
2145 lwp
->exit_jump_pad_bkpt
2146 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2150 debug_printf ("Checking whether LWP %ld needs to move out of "
2151 "the jump pad...it does\n",
2152 lwpid_of (current_thread
));
2153 current_thread
= saved_thread
;
2160 /* If we get a synchronous signal while collecting, *and*
2161 while executing the (relocated) original instruction,
2162 reset the PC to point at the tpoint address, before
2163 reporting to GDB. Otherwise, it's an IPA lib bug: just
2164 report the signal to GDB, and pray for the best. */
2166 lwp
->collecting_fast_tracepoint
= 0;
2169 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2170 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2173 struct regcache
*regcache
;
2175 /* The si_addr on a few signals references the address
2176 of the faulting instruction. Adjust that as
2178 if ((WSTOPSIG (*wstat
) == SIGILL
2179 || WSTOPSIG (*wstat
) == SIGFPE
2180 || WSTOPSIG (*wstat
) == SIGBUS
2181 || WSTOPSIG (*wstat
) == SIGSEGV
)
2182 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2183 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2184 /* Final check just to make sure we don't clobber
2185 the siginfo of non-kernel-sent signals. */
2186 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2188 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2189 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2190 (PTRACE_TYPE_ARG3
) 0, &info
);
2193 regcache
= get_thread_regcache (current_thread
, 1);
2194 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2195 lwp
->stop_pc
= status
.tpoint_addr
;
2197 /* Cancel any fast tracepoint lock this thread was
2199 force_unlock_trace_buffer ();
2202 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2205 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2206 "stopping all threads momentarily.\n");
2208 stop_all_lwps (1, lwp
);
2210 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2211 lwp
->exit_jump_pad_bkpt
= NULL
;
2213 unstop_all_lwps (1, lwp
);
2215 gdb_assert (lwp
->suspended
>= 0);
2221 debug_printf ("Checking whether LWP %ld needs to move out of the "
2223 lwpid_of (current_thread
));
2225 current_thread
= saved_thread
;
2229 /* Enqueue one signal in the "signals to report later when out of the
2233 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2235 struct pending_signals
*p_sig
;
2236 struct thread_info
*thread
= get_lwp_thread (lwp
);
2239 debug_printf ("Deferring signal %d for LWP %ld.\n",
2240 WSTOPSIG (*wstat
), lwpid_of (thread
));
2244 struct pending_signals
*sig
;
2246 for (sig
= lwp
->pending_signals_to_report
;
2249 debug_printf (" Already queued %d\n",
2252 debug_printf (" (no more currently queued signals)\n");
2255 /* Don't enqueue non-RT signals if they are already in the deferred
2256 queue. (SIGSTOP being the easiest signal to see ending up here
2258 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2260 struct pending_signals
*sig
;
2262 for (sig
= lwp
->pending_signals_to_report
;
2266 if (sig
->signal
== WSTOPSIG (*wstat
))
2269 debug_printf ("Not requeuing already queued non-RT signal %d"
2278 p_sig
= XCNEW (struct pending_signals
);
2279 p_sig
->prev
= lwp
->pending_signals_to_report
;
2280 p_sig
->signal
= WSTOPSIG (*wstat
);
2282 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2285 lwp
->pending_signals_to_report
= p_sig
;
2288 /* Dequeue one signal from the "signals to report later when out of
2289 the jump pad" list. */
2292 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2294 struct thread_info
*thread
= get_lwp_thread (lwp
);
2296 if (lwp
->pending_signals_to_report
!= NULL
)
2298 struct pending_signals
**p_sig
;
2300 p_sig
= &lwp
->pending_signals_to_report
;
2301 while ((*p_sig
)->prev
!= NULL
)
2302 p_sig
= &(*p_sig
)->prev
;
2304 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2305 if ((*p_sig
)->info
.si_signo
!= 0)
2306 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2312 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2313 WSTOPSIG (*wstat
), lwpid_of (thread
));
2317 struct pending_signals
*sig
;
2319 for (sig
= lwp
->pending_signals_to_report
;
2322 debug_printf (" Still queued %d\n",
2325 debug_printf (" (no more queued signals)\n");
2334 /* Fetch the possibly triggered data watchpoint info and store it in
2337 On some archs, like x86, that use debug registers to set
2338 watchpoints, it's possible that the way to know which watched
2339 address trapped, is to check the register that is used to select
2340 which address to watch. Problem is, between setting the watchpoint
2341 and reading back which data address trapped, the user may change
2342 the set of watchpoints, and, as a consequence, GDB changes the
2343 debug registers in the inferior. To avoid reading back a stale
2344 stopped-data-address when that happens, we cache in LP the fact
2345 that a watchpoint trapped, and the corresponding data address, as
2346 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2347 registers meanwhile, we have the cached data we can rely on. */
2350 check_stopped_by_watchpoint (struct lwp_info
*child
)
2352 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2354 struct thread_info
*saved_thread
;
2356 saved_thread
= current_thread
;
2357 current_thread
= get_lwp_thread (child
);
2359 if (the_low_target
.stopped_by_watchpoint ())
2361 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2363 if (the_low_target
.stopped_data_address
!= NULL
)
2364 child
->stopped_data_address
2365 = the_low_target
.stopped_data_address ();
2367 child
->stopped_data_address
= 0;
2370 current_thread
= saved_thread
;
2373 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2376 /* Return the ptrace options that we want to try to enable. */
2379 linux_low_ptrace_options (int attached
)
2384 options
|= PTRACE_O_EXITKILL
;
2386 if (report_fork_events
)
2387 options
|= PTRACE_O_TRACEFORK
;
2389 if (report_vfork_events
)
2390 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2392 if (report_exec_events
)
2393 options
|= PTRACE_O_TRACEEXEC
;
2395 options
|= PTRACE_O_TRACESYSGOOD
;
2400 /* Do low-level handling of the event, and check if we should go on
2401 and pass it to caller code. Return the affected lwp if we are, or
2404 static struct lwp_info
*
2405 linux_low_filter_event (int lwpid
, int wstat
)
2407 struct lwp_info
*child
;
2408 struct thread_info
*thread
;
2409 int have_stop_pc
= 0;
2411 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2413 /* Check for stop events reported by a process we didn't already
2414 know about - anything not already in our LWP list.
2416 If we're expecting to receive stopped processes after
2417 fork, vfork, and clone events, then we'll just add the
2418 new one to our list and go back to waiting for the event
2419 to be reported - the stopped process might be returned
2420 from waitpid before or after the event is.
2422 But note the case of a non-leader thread exec'ing after the
2423 leader having exited, and gone from our lists (because
2424 check_zombie_leaders deleted it). The non-leader thread
2425 changes its tid to the tgid. */
2427 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2428 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2432 /* A multi-thread exec after we had seen the leader exiting. */
2435 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2436 "after exec.\n", lwpid
);
2439 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2440 child
= add_lwp (child_ptid
);
2442 current_thread
= child
->thread
;
2445 /* If we didn't find a process, one of two things presumably happened:
2446 - A process we started and then detached from has exited. Ignore it.
2447 - A process we are controlling has forked and the new child's stop
2448 was reported to us by the kernel. Save its PID. */
2449 if (child
== NULL
&& WIFSTOPPED (wstat
))
2451 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2454 else if (child
== NULL
)
2457 thread
= get_lwp_thread (child
);
2461 child
->last_status
= wstat
;
2463 /* Check if the thread has exited. */
2464 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2467 debug_printf ("LLFE: %d exited.\n", lwpid
);
2469 if (finish_step_over (child
))
2471 /* Unsuspend all other LWPs, and set them back running again. */
2472 unsuspend_all_lwps (child
);
2475 /* If there is at least one more LWP, then the exit signal was
2476 not the end of the debugged application and should be
2477 ignored, unless GDB wants to hear about thread exits. */
2478 if (report_thread_events
2479 || last_thread_of_process_p (pid_of (thread
)))
2481 /* Since events are serialized to GDB core, and we can't
2482 report this one right now. Leave the status pending for
2483 the next time we're able to report it. */
2484 mark_lwp_dead (child
, wstat
);
2494 gdb_assert (WIFSTOPPED (wstat
));
2496 if (WIFSTOPPED (wstat
))
2498 struct process_info
*proc
;
2500 /* Architecture-specific setup after inferior is running. */
2501 proc
= find_process_pid (pid_of (thread
));
2502 if (proc
->tdesc
== NULL
)
2506 /* This needs to happen after we have attached to the
2507 inferior and it is stopped for the first time, but
2508 before we access any inferior registers. */
2509 linux_arch_setup_thread (thread
);
2513 /* The process is started, but GDBserver will do
2514 architecture-specific setup after the program stops at
2515 the first instruction. */
2516 child
->status_pending_p
= 1;
2517 child
->status_pending
= wstat
;
2523 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2525 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2526 int options
= linux_low_ptrace_options (proc
->attached
);
2528 linux_enable_event_reporting (lwpid
, options
);
2529 child
->must_set_ptrace_flags
= 0;
2532 /* Always update syscall_state, even if it will be filtered later. */
2533 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2535 child
->syscall_state
2536 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2537 ? TARGET_WAITKIND_SYSCALL_RETURN
2538 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2542 /* Almost all other ptrace-stops are known to be outside of system
2543 calls, with further exceptions in handle_extended_wait. */
2544 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2547 /* Be careful to not overwrite stop_pc until save_stop_reason is
2549 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2550 && linux_is_extended_waitstatus (wstat
))
2552 child
->stop_pc
= get_pc (child
);
2553 if (handle_extended_wait (&child
, wstat
))
2555 /* The event has been handled, so just return without
2561 if (linux_wstatus_maybe_breakpoint (wstat
))
2563 if (save_stop_reason (child
))
2568 child
->stop_pc
= get_pc (child
);
2570 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2571 && child
->stop_expected
)
2574 debug_printf ("Expected stop.\n");
2575 child
->stop_expected
= 0;
2577 if (thread
->last_resume_kind
== resume_stop
)
2579 /* We want to report the stop to the core. Treat the
2580 SIGSTOP as a normal event. */
2582 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2583 target_pid_to_str (ptid_of (thread
)));
2585 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2587 /* Stopping threads. We don't want this SIGSTOP to end up
2590 debug_printf ("LLW: SIGSTOP caught for %s "
2591 "while stopping threads.\n",
2592 target_pid_to_str (ptid_of (thread
)));
2597 /* This is a delayed SIGSTOP. Filter out the event. */
2599 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2600 child
->stepping
? "step" : "continue",
2601 target_pid_to_str (ptid_of (thread
)));
2603 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2608 child
->status_pending_p
= 1;
2609 child
->status_pending
= wstat
;
2613 /* Return true if THREAD is doing hardware single step. */
2616 maybe_hw_step (struct thread_info
*thread
)
2618 if (can_hardware_single_step ())
2622 /* GDBserver must insert reinsert breakpoint for software
2624 gdb_assert (has_reinsert_breakpoints (thread
));
2629 /* Resume LWPs that are currently stopped without any pending status
2630 to report, but are resumed from the core's perspective. */
2633 resume_stopped_resumed_lwps (struct inferior_list_entry
*entry
)
2635 struct thread_info
*thread
= (struct thread_info
*) entry
;
2636 struct lwp_info
*lp
= get_thread_lwp (thread
);
2640 && !lp
->status_pending_p
2641 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2643 int step
= thread
->last_resume_kind
== resume_step
;
2646 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2647 target_pid_to_str (ptid_of (thread
)),
2648 paddress (lp
->stop_pc
),
2651 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2655 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2656 match FILTER_PTID (leaving others pending). The PTIDs can be:
2657 minus_one_ptid, to specify any child; a pid PTID, specifying all
2658 lwps of a thread group; or a PTID representing a single lwp. Store
2659 the stop status through the status pointer WSTAT. OPTIONS is
2660 passed to the waitpid call. Return 0 if no event was found and
2661 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2662 was found. Return the PID of the stopped child otherwise. */
2665 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2666 int *wstatp
, int options
)
2668 struct thread_info
*event_thread
;
2669 struct lwp_info
*event_child
, *requested_child
;
2670 sigset_t block_mask
, prev_mask
;
2673 /* N.B. event_thread points to the thread_info struct that contains
2674 event_child. Keep them in sync. */
2675 event_thread
= NULL
;
2677 requested_child
= NULL
;
2679 /* Check for a lwp with a pending status. */
2681 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2683 event_thread
= (struct thread_info
*)
2684 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2685 if (event_thread
!= NULL
)
2686 event_child
= get_thread_lwp (event_thread
);
2687 if (debug_threads
&& event_thread
)
2688 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2690 else if (!ptid_equal (filter_ptid
, null_ptid
))
2692 requested_child
= find_lwp_pid (filter_ptid
);
2694 if (stopping_threads
== NOT_STOPPING_THREADS
2695 && requested_child
->status_pending_p
2696 && requested_child
->collecting_fast_tracepoint
)
2698 enqueue_one_deferred_signal (requested_child
,
2699 &requested_child
->status_pending
);
2700 requested_child
->status_pending_p
= 0;
2701 requested_child
->status_pending
= 0;
2702 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2705 if (requested_child
->suspended
2706 && requested_child
->status_pending_p
)
2708 internal_error (__FILE__
, __LINE__
,
2709 "requesting an event out of a"
2710 " suspended child?");
2713 if (requested_child
->status_pending_p
)
2715 event_child
= requested_child
;
2716 event_thread
= get_lwp_thread (event_child
);
2720 if (event_child
!= NULL
)
2723 debug_printf ("Got an event from pending child %ld (%04x)\n",
2724 lwpid_of (event_thread
), event_child
->status_pending
);
2725 *wstatp
= event_child
->status_pending
;
2726 event_child
->status_pending_p
= 0;
2727 event_child
->status_pending
= 0;
2728 current_thread
= event_thread
;
2729 return lwpid_of (event_thread
);
2732 /* But if we don't find a pending event, we'll have to wait.
2734 We only enter this loop if no process has a pending wait status.
2735 Thus any action taken in response to a wait status inside this
2736 loop is responding as soon as we detect the status, not after any
2739 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2740 all signals while here. */
2741 sigfillset (&block_mask
);
2742 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2744 /* Always pull all events out of the kernel. We'll randomly select
2745 an event LWP out of all that have events, to prevent
2747 while (event_child
== NULL
)
2751 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2754 - If the thread group leader exits while other threads in the
2755 thread group still exist, waitpid(TGID, ...) hangs. That
2756 waitpid won't return an exit status until the other threads
2757 in the group are reaped.
2759 - When a non-leader thread execs, that thread just vanishes
2760 without reporting an exit (so we'd hang if we waited for it
2761 explicitly in that case). The exec event is reported to
2764 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2767 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2768 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2774 debug_printf ("LLW: waitpid %ld received %s\n",
2775 (long) ret
, status_to_str (*wstatp
));
2778 /* Filter all events. IOW, leave all events pending. We'll
2779 randomly select an event LWP out of all that have events
2781 linux_low_filter_event (ret
, *wstatp
);
2782 /* Retry until nothing comes out of waitpid. A single
2783 SIGCHLD can indicate more than one child stopped. */
2787 /* Now that we've pulled all events out of the kernel, resume
2788 LWPs that don't have an interesting event to report. */
2789 if (stopping_threads
== NOT_STOPPING_THREADS
)
2790 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2792 /* ... and find an LWP with a status to report to the core, if
2794 event_thread
= (struct thread_info
*)
2795 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2796 if (event_thread
!= NULL
)
2798 event_child
= get_thread_lwp (event_thread
);
2799 *wstatp
= event_child
->status_pending
;
2800 event_child
->status_pending_p
= 0;
2801 event_child
->status_pending
= 0;
2805 /* Check for zombie thread group leaders. Those can't be reaped
2806 until all other threads in the thread group are. */
2807 check_zombie_leaders ();
2809 /* If there are no resumed children left in the set of LWPs we
2810 want to wait for, bail. We can't just block in
2811 waitpid/sigsuspend, because lwps might have been left stopped
2812 in trace-stop state, and we'd be stuck forever waiting for
2813 their status to change (which would only happen if we resumed
2814 them). Even if WNOHANG is set, this return code is preferred
2815 over 0 (below), as it is more detailed. */
2816 if ((find_inferior (&all_threads
,
2817 not_stopped_callback
,
2818 &wait_ptid
) == NULL
))
2821 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2822 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2826 /* No interesting event to report to the caller. */
2827 if ((options
& WNOHANG
))
2830 debug_printf ("WNOHANG set, no event found\n");
2832 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2836 /* Block until we get an event reported with SIGCHLD. */
2838 debug_printf ("sigsuspend'ing\n");
2840 sigsuspend (&prev_mask
);
2841 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2845 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2847 current_thread
= event_thread
;
2849 return lwpid_of (event_thread
);
2852 /* Wait for an event from child(ren) PTID. PTIDs can be:
2853 minus_one_ptid, to specify any child; a pid PTID, specifying all
2854 lwps of a thread group; or a PTID representing a single lwp. Store
2855 the stop status through the status pointer WSTAT. OPTIONS is
2856 passed to the waitpid call. Return 0 if no event was found and
2857 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2858 was found. Return the PID of the stopped child otherwise. */
2861 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2863 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2866 /* Count the LWP's that have had events. */
2869 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2871 struct thread_info
*thread
= (struct thread_info
*) entry
;
2872 struct lwp_info
*lp
= get_thread_lwp (thread
);
2873 int *count
= (int *) data
;
2875 gdb_assert (count
!= NULL
);
2877 /* Count only resumed LWPs that have an event pending. */
2878 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2879 && lp
->status_pending_p
)
2885 /* Select the LWP (if any) that is currently being single-stepped. */
2888 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2890 struct thread_info
*thread
= (struct thread_info
*) entry
;
2891 struct lwp_info
*lp
= get_thread_lwp (thread
);
2893 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2894 && thread
->last_resume_kind
== resume_step
2895 && lp
->status_pending_p
)
2901 /* Select the Nth LWP that has had an event. */
2904 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2906 struct thread_info
*thread
= (struct thread_info
*) entry
;
2907 struct lwp_info
*lp
= get_thread_lwp (thread
);
2908 int *selector
= (int *) data
;
2910 gdb_assert (selector
!= NULL
);
2912 /* Select only resumed LWPs that have an event pending. */
2913 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2914 && lp
->status_pending_p
)
2915 if ((*selector
)-- == 0)
2921 /* Select one LWP out of those that have events pending. */
2924 select_event_lwp (struct lwp_info
**orig_lp
)
2927 int random_selector
;
2928 struct thread_info
*event_thread
= NULL
;
2930 /* In all-stop, give preference to the LWP that is being
2931 single-stepped. There will be at most one, and it's the LWP that
2932 the core is most interested in. If we didn't do this, then we'd
2933 have to handle pending step SIGTRAPs somehow in case the core
2934 later continues the previously-stepped thread, otherwise we'd
2935 report the pending SIGTRAP, and the core, not having stepped the
2936 thread, wouldn't understand what the trap was for, and therefore
2937 would report it to the user as a random signal. */
2941 = (struct thread_info
*) find_inferior (&all_threads
,
2942 select_singlestep_lwp_callback
,
2944 if (event_thread
!= NULL
)
2947 debug_printf ("SEL: Select single-step %s\n",
2948 target_pid_to_str (ptid_of (event_thread
)));
2951 if (event_thread
== NULL
)
2953 /* No single-stepping LWP. Select one at random, out of those
2954 which have had events. */
2956 /* First see how many events we have. */
2957 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2958 gdb_assert (num_events
> 0);
2960 /* Now randomly pick a LWP out of those that have had
2962 random_selector
= (int)
2963 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2965 if (debug_threads
&& num_events
> 1)
2966 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2967 num_events
, random_selector
);
2970 = (struct thread_info
*) find_inferior (&all_threads
,
2971 select_event_lwp_callback
,
2975 if (event_thread
!= NULL
)
2977 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2979 /* Switch the event LWP. */
2980 *orig_lp
= event_lp
;
2984 /* Decrement the suspend count of an LWP. */
2987 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2989 struct thread_info
*thread
= (struct thread_info
*) entry
;
2990 struct lwp_info
*lwp
= get_thread_lwp (thread
);
2992 /* Ignore EXCEPT. */
2996 lwp_suspended_decr (lwp
);
3000 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
3004 unsuspend_all_lwps (struct lwp_info
*except
)
3006 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
3009 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
3010 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
3012 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
3013 static ptid_t
linux_wait_1 (ptid_t ptid
,
3014 struct target_waitstatus
*ourstatus
,
3015 int target_options
);
3017 /* Stabilize threads (move out of jump pads).
3019 If a thread is midway collecting a fast tracepoint, we need to
3020 finish the collection and move it out of the jump pad before
3021 reporting the signal.
3023 This avoids recursion while collecting (when a signal arrives
3024 midway, and the signal handler itself collects), which would trash
3025 the trace buffer. In case the user set a breakpoint in a signal
3026 handler, this avoids the backtrace showing the jump pad, etc..
3027 Most importantly, there are certain things we can't do safely if
3028 threads are stopped in a jump pad (or in its callee's). For
3031 - starting a new trace run. A thread still collecting the
3032 previous run, could trash the trace buffer when resumed. The trace
3033 buffer control structures would have been reset but the thread had
3034 no way to tell. The thread could even midway memcpy'ing to the
3035 buffer, which would mean that when resumed, it would clobber the
3036 trace buffer that had been set for a new run.
3038 - we can't rewrite/reuse the jump pads for new tracepoints
3039 safely. Say you do tstart while a thread is stopped midway while
3040 collecting. When the thread is later resumed, it finishes the
3041 collection, and returns to the jump pad, to execute the original
3042 instruction that was under the tracepoint jump at the time the
3043 older run had been started. If the jump pad had been rewritten
3044 since for something else in the new run, the thread would now
3045 execute the wrong / random instructions. */
3048 linux_stabilize_threads (void)
3050 struct thread_info
*saved_thread
;
3051 struct thread_info
*thread_stuck
;
3054 = (struct thread_info
*) find_inferior (&all_threads
,
3055 stuck_in_jump_pad_callback
,
3057 if (thread_stuck
!= NULL
)
3060 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
3061 lwpid_of (thread_stuck
));
3065 saved_thread
= current_thread
;
3067 stabilizing_threads
= 1;
3070 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
3072 /* Loop until all are stopped out of the jump pads. */
3073 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
3075 struct target_waitstatus ourstatus
;
3076 struct lwp_info
*lwp
;
3079 /* Note that we go through the full wait even loop. While
3080 moving threads out of jump pad, we need to be able to step
3081 over internal breakpoints and such. */
3082 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
3084 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
3086 lwp
= get_thread_lwp (current_thread
);
3089 lwp_suspended_inc (lwp
);
3091 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3092 || current_thread
->last_resume_kind
== resume_stop
)
3094 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3095 enqueue_one_deferred_signal (lwp
, &wstat
);
3100 unsuspend_all_lwps (NULL
);
3102 stabilizing_threads
= 0;
3104 current_thread
= saved_thread
;
3109 = (struct thread_info
*) find_inferior (&all_threads
,
3110 stuck_in_jump_pad_callback
,
3112 if (thread_stuck
!= NULL
)
3113 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3114 lwpid_of (thread_stuck
));
3118 /* Convenience function that is called when the kernel reports an
3119 event that is not passed out to GDB. */
3122 ignore_event (struct target_waitstatus
*ourstatus
)
3124 /* If we got an event, there may still be others, as a single
3125 SIGCHLD can indicate more than one child stopped. This forces
3126 another target_wait call. */
3129 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3133 /* Convenience function that is called when the kernel reports an exit
3134 event. This decides whether to report the event to GDB as a
3135 process exit event, a thread exit event, or to suppress the
3139 filter_exit_event (struct lwp_info
*event_child
,
3140 struct target_waitstatus
*ourstatus
)
3142 struct thread_info
*thread
= get_lwp_thread (event_child
);
3143 ptid_t ptid
= ptid_of (thread
);
3145 if (!last_thread_of_process_p (pid_of (thread
)))
3147 if (report_thread_events
)
3148 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3150 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3152 delete_lwp (event_child
);
3157 /* Returns 1 if GDB is interested in any event_child syscalls. */
3160 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3162 struct thread_info
*thread
= get_lwp_thread (event_child
);
3163 struct process_info
*proc
= get_thread_process (thread
);
3165 return !VEC_empty (int, proc
->syscalls_to_catch
);
3168 /* Returns 1 if GDB is interested in the event_child syscall.
3169 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3172 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3176 struct thread_info
*thread
= get_lwp_thread (event_child
);
3177 struct process_info
*proc
= get_thread_process (thread
);
3179 if (VEC_empty (int, proc
->syscalls_to_catch
))
3182 if (VEC_index (int, proc
->syscalls_to_catch
, 0) == ANY_SYSCALL
)
3185 get_syscall_trapinfo (event_child
, &sysno
);
3187 VEC_iterate (int, proc
->syscalls_to_catch
, i
, iter
);
3195 /* Wait for process, returns status. */
3198 linux_wait_1 (ptid_t ptid
,
3199 struct target_waitstatus
*ourstatus
, int target_options
)
3202 struct lwp_info
*event_child
;
3205 int step_over_finished
;
3206 int bp_explains_trap
;
3207 int maybe_internal_trap
;
3216 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3219 /* Translate generic target options into linux options. */
3221 if (target_options
& TARGET_WNOHANG
)
3224 bp_explains_trap
= 0;
3227 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3229 /* Find a resumed LWP, if any. */
3230 if (find_inferior (&all_threads
,
3231 status_pending_p_callback
,
3232 &minus_one_ptid
) != NULL
)
3234 else if ((find_inferior (&all_threads
,
3235 not_stopped_callback
,
3236 &minus_one_ptid
) != NULL
))
3241 if (ptid_equal (step_over_bkpt
, null_ptid
))
3242 pid
= linux_wait_for_event (ptid
, &w
, options
);
3246 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3247 target_pid_to_str (step_over_bkpt
));
3248 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3251 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3253 gdb_assert (target_options
& TARGET_WNOHANG
);
3257 debug_printf ("linux_wait_1 ret = null_ptid, "
3258 "TARGET_WAITKIND_IGNORE\n");
3262 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3269 debug_printf ("linux_wait_1 ret = null_ptid, "
3270 "TARGET_WAITKIND_NO_RESUMED\n");
3274 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3278 event_child
= get_thread_lwp (current_thread
);
3280 /* linux_wait_for_event only returns an exit status for the last
3281 child of a process. Report it. */
3282 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3286 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3287 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3291 debug_printf ("linux_wait_1 ret = %s, exited with "
3293 target_pid_to_str (ptid_of (current_thread
)),
3300 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3301 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3305 debug_printf ("linux_wait_1 ret = %s, terminated with "
3307 target_pid_to_str (ptid_of (current_thread
)),
3313 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3314 return filter_exit_event (event_child
, ourstatus
);
3316 return ptid_of (current_thread
);
3319 /* If step-over executes a breakpoint instruction, in the case of a
3320 hardware single step it means a gdb/gdbserver breakpoint had been
3321 planted on top of a permanent breakpoint, in the case of a software
3322 single step it may just mean that gdbserver hit the reinsert breakpoint.
3323 The PC has been adjusted by save_stop_reason to point at
3324 the breakpoint address.
3325 So in the case of the hardware single step advance the PC manually
3326 past the breakpoint and in the case of software single step advance only
3327 if it's not the reinsert_breakpoint we are hitting.
3328 This avoids that a program would keep trapping a permanent breakpoint
3330 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3331 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3332 && (event_child
->stepping
3333 || !reinsert_breakpoint_inserted_here (event_child
->stop_pc
)))
3335 int increment_pc
= 0;
3336 int breakpoint_kind
= 0;
3337 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3340 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3341 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3345 debug_printf ("step-over for %s executed software breakpoint\n",
3346 target_pid_to_str (ptid_of (current_thread
)));
3349 if (increment_pc
!= 0)
3351 struct regcache
*regcache
3352 = get_thread_regcache (current_thread
, 1);
3354 event_child
->stop_pc
+= increment_pc
;
3355 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3357 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3358 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3362 /* If this event was not handled before, and is not a SIGTRAP, we
3363 report it. SIGILL and SIGSEGV are also treated as traps in case
3364 a breakpoint is inserted at the current PC. If this target does
3365 not support internal breakpoints at all, we also report the
3366 SIGTRAP without further processing; it's of no concern to us. */
3368 = (supports_breakpoints ()
3369 && (WSTOPSIG (w
) == SIGTRAP
3370 || ((WSTOPSIG (w
) == SIGILL
3371 || WSTOPSIG (w
) == SIGSEGV
)
3372 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3374 if (maybe_internal_trap
)
3376 /* Handle anything that requires bookkeeping before deciding to
3377 report the event or continue waiting. */
3379 /* First check if we can explain the SIGTRAP with an internal
3380 breakpoint, or if we should possibly report the event to GDB.
3381 Do this before anything that may remove or insert a
3383 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3385 /* We have a SIGTRAP, possibly a step-over dance has just
3386 finished. If so, tweak the state machine accordingly,
3387 reinsert breakpoints and delete any reinsert (software
3388 single-step) breakpoints. */
3389 step_over_finished
= finish_step_over (event_child
);
3391 /* Now invoke the callbacks of any internal breakpoints there. */
3392 check_breakpoints (event_child
->stop_pc
);
3394 /* Handle tracepoint data collecting. This may overflow the
3395 trace buffer, and cause a tracing stop, removing
3397 trace_event
= handle_tracepoints (event_child
);
3399 if (bp_explains_trap
)
3402 debug_printf ("Hit a gdbserver breakpoint.\n");
3407 /* We have some other signal, possibly a step-over dance was in
3408 progress, and it should be cancelled too. */
3409 step_over_finished
= finish_step_over (event_child
);
3412 /* We have all the data we need. Either report the event to GDB, or
3413 resume threads and keep waiting for more. */
3415 /* If we're collecting a fast tracepoint, finish the collection and
3416 move out of the jump pad before delivering a signal. See
3417 linux_stabilize_threads. */
3420 && WSTOPSIG (w
) != SIGTRAP
3421 && supports_fast_tracepoints ()
3422 && agent_loaded_p ())
3425 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3426 "to defer or adjust it.\n",
3427 WSTOPSIG (w
), lwpid_of (current_thread
));
3429 /* Allow debugging the jump pad itself. */
3430 if (current_thread
->last_resume_kind
!= resume_step
3431 && maybe_move_out_of_jump_pad (event_child
, &w
))
3433 enqueue_one_deferred_signal (event_child
, &w
);
3436 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3437 WSTOPSIG (w
), lwpid_of (current_thread
));
3439 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3441 return ignore_event (ourstatus
);
3445 if (event_child
->collecting_fast_tracepoint
)
3448 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3449 "Check if we're already there.\n",
3450 lwpid_of (current_thread
),
3451 event_child
->collecting_fast_tracepoint
);
3455 event_child
->collecting_fast_tracepoint
3456 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3458 if (event_child
->collecting_fast_tracepoint
!= 1)
3460 /* No longer need this breakpoint. */
3461 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3464 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3465 "stopping all threads momentarily.\n");
3467 /* Other running threads could hit this breakpoint.
3468 We don't handle moribund locations like GDB does,
3469 instead we always pause all threads when removing
3470 breakpoints, so that any step-over or
3471 decr_pc_after_break adjustment is always taken
3472 care of while the breakpoint is still
3474 stop_all_lwps (1, event_child
);
3476 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3477 event_child
->exit_jump_pad_bkpt
= NULL
;
3479 unstop_all_lwps (1, event_child
);
3481 gdb_assert (event_child
->suspended
>= 0);
3485 if (event_child
->collecting_fast_tracepoint
== 0)
3488 debug_printf ("fast tracepoint finished "
3489 "collecting successfully.\n");
3491 /* We may have a deferred signal to report. */
3492 if (dequeue_one_deferred_signal (event_child
, &w
))
3495 debug_printf ("dequeued one signal.\n");
3500 debug_printf ("no deferred signals.\n");
3502 if (stabilizing_threads
)
3504 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3505 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3509 debug_printf ("linux_wait_1 ret = %s, stopped "
3510 "while stabilizing threads\n",
3511 target_pid_to_str (ptid_of (current_thread
)));
3515 return ptid_of (current_thread
);
3521 /* Check whether GDB would be interested in this event. */
3523 /* Check if GDB is interested in this syscall. */
3525 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3526 && !gdb_catch_this_syscall_p (event_child
))
3530 debug_printf ("Ignored syscall for LWP %ld.\n",
3531 lwpid_of (current_thread
));
3534 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3536 return ignore_event (ourstatus
);
3539 /* If GDB is not interested in this signal, don't stop other
3540 threads, and don't report it to GDB. Just resume the inferior
3541 right away. We do this for threading-related signals as well as
3542 any that GDB specifically requested we ignore. But never ignore
3543 SIGSTOP if we sent it ourselves, and do not ignore signals when
3544 stepping - they may require special handling to skip the signal
3545 handler. Also never ignore signals that could be caused by a
3548 && current_thread
->last_resume_kind
!= resume_step
3550 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3551 (current_process ()->priv
->thread_db
!= NULL
3552 && (WSTOPSIG (w
) == __SIGRTMIN
3553 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3556 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3557 && !(WSTOPSIG (w
) == SIGSTOP
3558 && current_thread
->last_resume_kind
== resume_stop
)
3559 && !linux_wstatus_maybe_breakpoint (w
))))
3561 siginfo_t info
, *info_p
;
3564 debug_printf ("Ignored signal %d for LWP %ld.\n",
3565 WSTOPSIG (w
), lwpid_of (current_thread
));
3567 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3568 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3573 if (step_over_finished
)
3575 /* We cancelled this thread's step-over above. We still
3576 need to unsuspend all other LWPs, and set them back
3577 running again while the signal handler runs. */
3578 unsuspend_all_lwps (event_child
);
3580 /* Enqueue the pending signal info so that proceed_all_lwps
3582 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3584 proceed_all_lwps ();
3588 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3589 WSTOPSIG (w
), info_p
);
3591 return ignore_event (ourstatus
);
3594 /* Note that all addresses are always "out of the step range" when
3595 there's no range to begin with. */
3596 in_step_range
= lwp_in_step_range (event_child
);
3598 /* If GDB wanted this thread to single step, and the thread is out
3599 of the step range, we always want to report the SIGTRAP, and let
3600 GDB handle it. Watchpoints should always be reported. So should
3601 signals we can't explain. A SIGTRAP we can't explain could be a
3602 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3603 do, we're be able to handle GDB breakpoints on top of internal
3604 breakpoints, by handling the internal breakpoint and still
3605 reporting the event to GDB. If we don't, we're out of luck, GDB
3606 won't see the breakpoint hit. If we see a single-step event but
3607 the thread should be continuing, don't pass the trap to gdb.
3608 That indicates that we had previously finished a single-step but
3609 left the single-step pending -- see
3610 complete_ongoing_step_over. */
3611 report_to_gdb
= (!maybe_internal_trap
3612 || (current_thread
->last_resume_kind
== resume_step
3614 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3616 && !bp_explains_trap
3618 && !step_over_finished
3619 && !(current_thread
->last_resume_kind
== resume_continue
3620 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3621 || (gdb_breakpoint_here (event_child
->stop_pc
)
3622 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3623 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3624 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3626 run_breakpoint_commands (event_child
->stop_pc
);
3628 /* We found no reason GDB would want us to stop. We either hit one
3629 of our own breakpoints, or finished an internal step GDB
3630 shouldn't know about. */
3635 if (bp_explains_trap
)
3636 debug_printf ("Hit a gdbserver breakpoint.\n");
3637 if (step_over_finished
)
3638 debug_printf ("Step-over finished.\n");
3640 debug_printf ("Tracepoint event.\n");
3641 if (lwp_in_step_range (event_child
))
3642 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3643 paddress (event_child
->stop_pc
),
3644 paddress (event_child
->step_range_start
),
3645 paddress (event_child
->step_range_end
));
3648 /* We're not reporting this breakpoint to GDB, so apply the
3649 decr_pc_after_break adjustment to the inferior's regcache
3652 if (the_low_target
.set_pc
!= NULL
)
3654 struct regcache
*regcache
3655 = get_thread_regcache (current_thread
, 1);
3656 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3659 /* We may have finished stepping over a breakpoint. If so,
3660 we've stopped and suspended all LWPs momentarily except the
3661 stepping one. This is where we resume them all again. We're
3662 going to keep waiting, so use proceed, which handles stepping
3663 over the next breakpoint. */
3665 debug_printf ("proceeding all threads.\n");
3667 if (step_over_finished
)
3668 unsuspend_all_lwps (event_child
);
3670 proceed_all_lwps ();
3671 return ignore_event (ourstatus
);
3676 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3680 str
= target_waitstatus_to_string (&event_child
->waitstatus
);
3681 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3682 lwpid_of (get_lwp_thread (event_child
)), str
);
3685 if (current_thread
->last_resume_kind
== resume_step
)
3687 if (event_child
->step_range_start
== event_child
->step_range_end
)
3688 debug_printf ("GDB wanted to single-step, reporting event.\n");
3689 else if (!lwp_in_step_range (event_child
))
3690 debug_printf ("Out of step range, reporting event.\n");
3692 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3693 debug_printf ("Stopped by watchpoint.\n");
3694 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3695 debug_printf ("Stopped by GDB breakpoint.\n");
3697 debug_printf ("Hit a non-gdbserver trap event.\n");
3700 /* Alright, we're going to report a stop. */
3702 if (!stabilizing_threads
)
3704 /* In all-stop, stop all threads. */
3706 stop_all_lwps (0, NULL
);
3708 /* If we're not waiting for a specific LWP, choose an event LWP
3709 from among those that have had events. Giving equal priority
3710 to all LWPs that have had events helps prevent
3712 if (ptid_equal (ptid
, minus_one_ptid
))
3714 event_child
->status_pending_p
= 1;
3715 event_child
->status_pending
= w
;
3717 select_event_lwp (&event_child
);
3719 /* current_thread and event_child must stay in sync. */
3720 current_thread
= get_lwp_thread (event_child
);
3722 event_child
->status_pending_p
= 0;
3723 w
= event_child
->status_pending
;
3726 if (step_over_finished
)
3730 /* If we were doing a step-over, all other threads but
3731 the stepping one had been paused in start_step_over,
3732 with their suspend counts incremented. We don't want
3733 to do a full unstop/unpause, because we're in
3734 all-stop mode (so we want threads stopped), but we
3735 still need to unsuspend the other threads, to
3736 decrement their `suspended' count back. */
3737 unsuspend_all_lwps (event_child
);
3741 /* If we just finished a step-over, then all threads had
3742 been momentarily paused. In all-stop, that's fine,
3743 we want threads stopped by now anyway. In non-stop,
3744 we need to re-resume threads that GDB wanted to be
3746 unstop_all_lwps (1, event_child
);
3750 /* Stabilize threads (move out of jump pads). */
3752 stabilize_threads ();
3756 /* If we just finished a step-over, then all threads had been
3757 momentarily paused. In all-stop, that's fine, we want
3758 threads stopped by now anyway. In non-stop, we need to
3759 re-resume threads that GDB wanted to be running. */
3760 if (step_over_finished
)
3761 unstop_all_lwps (1, event_child
);
3764 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3766 /* If the reported event is an exit, fork, vfork or exec, let
3768 *ourstatus
= event_child
->waitstatus
;
3769 /* Clear the event lwp's waitstatus since we handled it already. */
3770 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3773 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3775 /* Now that we've selected our final event LWP, un-adjust its PC if
3776 it was a software breakpoint, and the client doesn't know we can
3777 adjust the breakpoint ourselves. */
3778 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3779 && !swbreak_feature
)
3781 int decr_pc
= the_low_target
.decr_pc_after_break
;
3785 struct regcache
*regcache
3786 = get_thread_regcache (current_thread
, 1);
3787 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3791 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3793 get_syscall_trapinfo (event_child
,
3794 &ourstatus
->value
.syscall_number
);
3795 ourstatus
->kind
= event_child
->syscall_state
;
3797 else if (current_thread
->last_resume_kind
== resume_stop
3798 && WSTOPSIG (w
) == SIGSTOP
)
3800 /* A thread that has been requested to stop by GDB with vCont;t,
3801 and it stopped cleanly, so report as SIG0. The use of
3802 SIGSTOP is an implementation detail. */
3803 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3805 else if (current_thread
->last_resume_kind
== resume_stop
3806 && WSTOPSIG (w
) != SIGSTOP
)
3808 /* A thread that has been requested to stop by GDB with vCont;t,
3809 but, it stopped for other reasons. */
3810 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3812 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3814 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3817 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3821 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3822 target_pid_to_str (ptid_of (current_thread
)),
3823 ourstatus
->kind
, ourstatus
->value
.sig
);
3827 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3828 return filter_exit_event (event_child
, ourstatus
);
3830 return ptid_of (current_thread
);
3833 /* Get rid of any pending event in the pipe. */
3835 async_file_flush (void)
3841 ret
= read (linux_event_pipe
[0], &buf
, 1);
3842 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3845 /* Put something in the pipe, so the event loop wakes up. */
3847 async_file_mark (void)
3851 async_file_flush ();
3854 ret
= write (linux_event_pipe
[1], "+", 1);
3855 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3857 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3858 be awakened anyway. */
3862 linux_wait (ptid_t ptid
,
3863 struct target_waitstatus
*ourstatus
, int target_options
)
3867 /* Flush the async file first. */
3868 if (target_is_async_p ())
3869 async_file_flush ();
3873 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3875 while ((target_options
& TARGET_WNOHANG
) == 0
3876 && ptid_equal (event_ptid
, null_ptid
)
3877 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3879 /* If at least one stop was reported, there may be more. A single
3880 SIGCHLD can signal more than one child stop. */
3881 if (target_is_async_p ()
3882 && (target_options
& TARGET_WNOHANG
) != 0
3883 && !ptid_equal (event_ptid
, null_ptid
))
3889 /* Send a signal to an LWP. */
3892 kill_lwp (unsigned long lwpid
, int signo
)
3897 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3898 if (errno
== ENOSYS
)
3900 /* If tkill fails, then we are not using nptl threads, a
3901 configuration we no longer support. */
3902 perror_with_name (("tkill"));
3908 linux_stop_lwp (struct lwp_info
*lwp
)
3914 send_sigstop (struct lwp_info
*lwp
)
3918 pid
= lwpid_of (get_lwp_thread (lwp
));
3920 /* If we already have a pending stop signal for this process, don't
3922 if (lwp
->stop_expected
)
3925 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3931 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3933 lwp
->stop_expected
= 1;
3934 kill_lwp (pid
, SIGSTOP
);
3938 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
3940 struct thread_info
*thread
= (struct thread_info
*) entry
;
3941 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3943 /* Ignore EXCEPT. */
3954 /* Increment the suspend count of an LWP, and stop it, if not stopped
3957 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
3960 struct thread_info
*thread
= (struct thread_info
*) entry
;
3961 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3963 /* Ignore EXCEPT. */
3967 lwp_suspended_inc (lwp
);
3969 return send_sigstop_callback (entry
, except
);
3973 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3975 /* Store the exit status for later. */
3976 lwp
->status_pending_p
= 1;
3977 lwp
->status_pending
= wstat
;
3979 /* Store in waitstatus as well, as there's nothing else to process
3981 if (WIFEXITED (wstat
))
3983 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
3984 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
3986 else if (WIFSIGNALED (wstat
))
3988 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
3989 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
3992 /* Prevent trying to stop it. */
3995 /* No further stops are expected from a dead lwp. */
3996 lwp
->stop_expected
= 0;
3999 /* Return true if LWP has exited already, and has a pending exit event
4000 to report to GDB. */
4003 lwp_is_marked_dead (struct lwp_info
*lwp
)
4005 return (lwp
->status_pending_p
4006 && (WIFEXITED (lwp
->status_pending
)
4007 || WIFSIGNALED (lwp
->status_pending
)));
4010 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4013 wait_for_sigstop (void)
4015 struct thread_info
*saved_thread
;
4020 saved_thread
= current_thread
;
4021 if (saved_thread
!= NULL
)
4022 saved_tid
= saved_thread
->entry
.id
;
4024 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4027 debug_printf ("wait_for_sigstop: pulling events\n");
4029 /* Passing NULL_PTID as filter indicates we want all events to be
4030 left pending. Eventually this returns when there are no
4031 unwaited-for children left. */
4032 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4034 gdb_assert (ret
== -1);
4036 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4037 current_thread
= saved_thread
;
4041 debug_printf ("Previously current thread died.\n");
4043 /* We can't change the current inferior behind GDB's back,
4044 otherwise, a subsequent command may apply to the wrong
4046 current_thread
= NULL
;
4050 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
4051 move it out, because we need to report the stop event to GDB. For
4052 example, if the user puts a breakpoint in the jump pad, it's
4053 because she wants to debug it. */
4056 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
4058 struct thread_info
*thread
= (struct thread_info
*) entry
;
4059 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4061 if (lwp
->suspended
!= 0)
4063 internal_error (__FILE__
, __LINE__
,
4064 "LWP %ld is suspended, suspended=%d\n",
4065 lwpid_of (thread
), lwp
->suspended
);
4067 gdb_assert (lwp
->stopped
);
4069 /* Allow debugging the jump pad, gdb_collect, etc.. */
4070 return (supports_fast_tracepoints ()
4071 && agent_loaded_p ()
4072 && (gdb_breakpoint_here (lwp
->stop_pc
)
4073 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4074 || thread
->last_resume_kind
== resume_step
)
4075 && linux_fast_tracepoint_collecting (lwp
, NULL
));
4079 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
4081 struct thread_info
*thread
= (struct thread_info
*) entry
;
4082 struct thread_info
*saved_thread
;
4083 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4086 if (lwp
->suspended
!= 0)
4088 internal_error (__FILE__
, __LINE__
,
4089 "LWP %ld is suspended, suspended=%d\n",
4090 lwpid_of (thread
), lwp
->suspended
);
4092 gdb_assert (lwp
->stopped
);
4094 /* For gdb_breakpoint_here. */
4095 saved_thread
= current_thread
;
4096 current_thread
= thread
;
4098 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4100 /* Allow debugging the jump pad, gdb_collect, etc. */
4101 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4102 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4103 && thread
->last_resume_kind
!= resume_step
4104 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4107 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4112 lwp
->status_pending_p
= 0;
4113 enqueue_one_deferred_signal (lwp
, wstat
);
4116 debug_printf ("Signal %d for LWP %ld deferred "
4118 WSTOPSIG (*wstat
), lwpid_of (thread
));
4121 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4124 lwp_suspended_inc (lwp
);
4126 current_thread
= saved_thread
;
4130 lwp_running (struct inferior_list_entry
*entry
, void *data
)
4132 struct thread_info
*thread
= (struct thread_info
*) entry
;
4133 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4135 if (lwp_is_marked_dead (lwp
))
4142 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4143 If SUSPEND, then also increase the suspend count of every LWP,
4147 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4149 /* Should not be called recursively. */
4150 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4155 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4156 suspend
? "stop-and-suspend" : "stop",
4158 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4162 stopping_threads
= (suspend
4163 ? STOPPING_AND_SUSPENDING_THREADS
4164 : STOPPING_THREADS
);
4167 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
4169 find_inferior (&all_threads
, send_sigstop_callback
, except
);
4170 wait_for_sigstop ();
4171 stopping_threads
= NOT_STOPPING_THREADS
;
4175 debug_printf ("stop_all_lwps done, setting stopping_threads "
4176 "back to !stopping\n");
4181 /* Enqueue one signal in the chain of signals which need to be
4182 delivered to this process on next resume. */
4185 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4187 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4189 p_sig
->prev
= lwp
->pending_signals
;
4190 p_sig
->signal
= signal
;
4192 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4194 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4195 lwp
->pending_signals
= p_sig
;
4198 /* Install breakpoints for software single stepping. */
4201 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4205 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4206 VEC (CORE_ADDR
) *next_pcs
= NULL
;
4207 struct cleanup
*old_chain
= make_cleanup (VEC_cleanup (CORE_ADDR
), &next_pcs
);
4209 next_pcs
= (*the_low_target
.get_next_pcs
) (regcache
);
4211 for (i
= 0; VEC_iterate (CORE_ADDR
, next_pcs
, i
, pc
); ++i
)
4212 set_reinsert_breakpoint (pc
, current_ptid
);
4214 do_cleanups (old_chain
);
4217 /* Single step via hardware or software single step.
4218 Return 1 if hardware single stepping, 0 if software single stepping
4219 or can't single step. */
4222 single_step (struct lwp_info
* lwp
)
4226 if (can_hardware_single_step ())
4230 else if (can_software_single_step ())
4232 install_software_single_step_breakpoints (lwp
);
4238 debug_printf ("stepping is not implemented on this target");
4244 /* The signal can be delivered to the inferior if we are not trying to
4245 finish a fast tracepoint collect. Since signal can be delivered in
4246 the step-over, the program may go to signal handler and trap again
4247 after return from the signal handler. We can live with the spurious
4251 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4253 return !lwp
->collecting_fast_tracepoint
;
4256 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4257 SIGNAL is nonzero, give it that signal. */
4260 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4261 int step
, int signal
, siginfo_t
*info
)
4263 struct thread_info
*thread
= get_lwp_thread (lwp
);
4264 struct thread_info
*saved_thread
;
4265 int fast_tp_collecting
;
4267 struct process_info
*proc
= get_thread_process (thread
);
4269 /* Note that target description may not be initialised
4270 (proc->tdesc == NULL) at this point because the program hasn't
4271 stopped at the first instruction yet. It means GDBserver skips
4272 the extra traps from the wrapper program (see option --wrapper).
4273 Code in this function that requires register access should be
4274 guarded by proc->tdesc == NULL or something else. */
4276 if (lwp
->stopped
== 0)
4279 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4281 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
4283 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
4285 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4286 user used the "jump" command, or "set $pc = foo"). */
4287 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4289 /* Collecting 'while-stepping' actions doesn't make sense
4291 release_while_stepping_state_list (thread
);
4294 /* If we have pending signals or status, and a new signal, enqueue the
4295 signal. Also enqueue the signal if it can't be delivered to the
4296 inferior right now. */
4298 && (lwp
->status_pending_p
4299 || lwp
->pending_signals
!= NULL
4300 || !lwp_signal_can_be_delivered (lwp
)))
4302 enqueue_pending_signal (lwp
, signal
, info
);
4304 /* Postpone any pending signal. It was enqueued above. */
4308 if (lwp
->status_pending_p
)
4311 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4312 " has pending status\n",
4313 lwpid_of (thread
), step
? "step" : "continue",
4314 lwp
->stop_expected
? "expected" : "not expected");
4318 saved_thread
= current_thread
;
4319 current_thread
= thread
;
4321 /* This bit needs some thinking about. If we get a signal that
4322 we must report while a single-step reinsert is still pending,
4323 we often end up resuming the thread. It might be better to
4324 (ew) allow a stack of pending events; then we could be sure that
4325 the reinsert happened right away and not lose any signals.
4327 Making this stack would also shrink the window in which breakpoints are
4328 uninserted (see comment in linux_wait_for_lwp) but not enough for
4329 complete correctness, so it won't solve that problem. It may be
4330 worthwhile just to solve this one, however. */
4331 if (lwp
->bp_reinsert
!= 0)
4334 debug_printf (" pending reinsert at 0x%s\n",
4335 paddress (lwp
->bp_reinsert
));
4337 if (can_hardware_single_step ())
4339 if (fast_tp_collecting
== 0)
4342 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
4344 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
4349 step
= maybe_hw_step (thread
);
4353 /* If the thread isn't doing step-over, there shouldn't be any
4354 reinsert breakpoints. */
4355 gdb_assert (!has_reinsert_breakpoints (thread
));
4358 if (fast_tp_collecting
== 1)
4361 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4362 " (exit-jump-pad-bkpt)\n",
4365 else if (fast_tp_collecting
== 2)
4368 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4369 " single-stepping\n",
4372 if (can_hardware_single_step ())
4376 internal_error (__FILE__
, __LINE__
,
4377 "moving out of jump pad single-stepping"
4378 " not implemented on this target");
4382 /* If we have while-stepping actions in this thread set it stepping.
4383 If we have a signal to deliver, it may or may not be set to
4384 SIG_IGN, we don't know. Assume so, and allow collecting
4385 while-stepping into a signal handler. A possible smart thing to
4386 do would be to set an internal breakpoint at the signal return
4387 address, continue, and carry on catching this while-stepping
4388 action only when that breakpoint is hit. A future
4390 if (thread
->while_stepping
!= NULL
)
4393 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4396 step
= single_step (lwp
);
4399 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4401 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4403 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4407 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4408 (long) lwp
->stop_pc
);
4412 /* If we have pending signals, consume one if it can be delivered to
4414 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4416 struct pending_signals
**p_sig
;
4418 p_sig
= &lwp
->pending_signals
;
4419 while ((*p_sig
)->prev
!= NULL
)
4420 p_sig
= &(*p_sig
)->prev
;
4422 signal
= (*p_sig
)->signal
;
4423 if ((*p_sig
)->info
.si_signo
!= 0)
4424 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4432 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4433 lwpid_of (thread
), step
? "step" : "continue", signal
,
4434 lwp
->stop_expected
? "expected" : "not expected");
4436 if (the_low_target
.prepare_to_resume
!= NULL
)
4437 the_low_target
.prepare_to_resume (lwp
);
4439 regcache_invalidate_thread (thread
);
4441 lwp
->stepping
= step
;
4443 ptrace_request
= PTRACE_SINGLESTEP
;
4444 else if (gdb_catching_syscalls_p (lwp
))
4445 ptrace_request
= PTRACE_SYSCALL
;
4447 ptrace_request
= PTRACE_CONT
;
4448 ptrace (ptrace_request
,
4450 (PTRACE_TYPE_ARG3
) 0,
4451 /* Coerce to a uintptr_t first to avoid potential gcc warning
4452 of coercing an 8 byte integer to a 4 byte pointer. */
4453 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4455 current_thread
= saved_thread
;
4457 perror_with_name ("resuming thread");
4459 /* Successfully resumed. Clear state that no longer makes sense,
4460 and mark the LWP as running. Must not do this before resuming
4461 otherwise if that fails other code will be confused. E.g., we'd
4462 later try to stop the LWP and hang forever waiting for a stop
4463 status. Note that we must not throw after this is cleared,
4464 otherwise handle_zombie_lwp_error would get confused. */
4466 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4469 /* Called when we try to resume a stopped LWP and that errors out. If
4470 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4471 or about to become), discard the error, clear any pending status
4472 the LWP may have, and return true (we'll collect the exit status
4473 soon enough). Otherwise, return false. */
4476 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4478 struct thread_info
*thread
= get_lwp_thread (lp
);
4480 /* If we get an error after resuming the LWP successfully, we'd
4481 confuse !T state for the LWP being gone. */
4482 gdb_assert (lp
->stopped
);
4484 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4485 because even if ptrace failed with ESRCH, the tracee may be "not
4486 yet fully dead", but already refusing ptrace requests. In that
4487 case the tracee has 'R (Running)' state for a little bit
4488 (observed in Linux 3.18). See also the note on ESRCH in the
4489 ptrace(2) man page. Instead, check whether the LWP has any state
4490 other than ptrace-stopped. */
4492 /* Don't assume anything if /proc/PID/status can't be read. */
4493 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4495 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4496 lp
->status_pending_p
= 0;
4502 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4503 disappears while we try to resume it. */
4506 linux_resume_one_lwp (struct lwp_info
*lwp
,
4507 int step
, int signal
, siginfo_t
*info
)
4511 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4513 CATCH (ex
, RETURN_MASK_ERROR
)
4515 if (!check_ptrace_stopped_lwp_gone (lwp
))
4516 throw_exception (ex
);
4521 struct thread_resume_array
4523 struct thread_resume
*resume
;
4527 /* This function is called once per thread via find_inferior.
4528 ARG is a pointer to a thread_resume_array struct.
4529 We look up the thread specified by ENTRY in ARG, and mark the thread
4530 with a pointer to the appropriate resume request.
4532 This algorithm is O(threads * resume elements), but resume elements
4533 is small (and will remain small at least until GDB supports thread
4537 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
4539 struct thread_info
*thread
= (struct thread_info
*) entry
;
4540 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4542 struct thread_resume_array
*r
;
4544 r
= (struct thread_resume_array
*) arg
;
4546 for (ndx
= 0; ndx
< r
->n
; ndx
++)
4548 ptid_t ptid
= r
->resume
[ndx
].thread
;
4549 if (ptid_equal (ptid
, minus_one_ptid
)
4550 || ptid_equal (ptid
, entry
->id
)
4551 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4553 || (ptid_get_pid (ptid
) == pid_of (thread
)
4554 && (ptid_is_pid (ptid
)
4555 || ptid_get_lwp (ptid
) == -1)))
4557 if (r
->resume
[ndx
].kind
== resume_stop
4558 && thread
->last_resume_kind
== resume_stop
)
4561 debug_printf ("already %s LWP %ld at GDB's request\n",
4562 (thread
->last_status
.kind
4563 == TARGET_WAITKIND_STOPPED
)
4571 lwp
->resume
= &r
->resume
[ndx
];
4572 thread
->last_resume_kind
= lwp
->resume
->kind
;
4574 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4575 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4577 /* If we had a deferred signal to report, dequeue one now.
4578 This can happen if LWP gets more than one signal while
4579 trying to get out of a jump pad. */
4581 && !lwp
->status_pending_p
4582 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4584 lwp
->status_pending_p
= 1;
4587 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4588 "leaving status pending.\n",
4589 WSTOPSIG (lwp
->status_pending
),
4597 /* No resume action for this thread. */
4603 /* find_inferior callback for linux_resume.
4604 Set *FLAG_P if this lwp has an interesting status pending. */
4607 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
4609 struct thread_info
*thread
= (struct thread_info
*) entry
;
4610 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4612 /* LWPs which will not be resumed are not interesting, because
4613 we might not wait for them next time through linux_wait. */
4614 if (lwp
->resume
== NULL
)
4617 if (thread_still_has_status_pending_p (thread
))
4618 * (int *) flag_p
= 1;
4623 /* Return 1 if this lwp that GDB wants running is stopped at an
4624 internal breakpoint that we need to step over. It assumes that any
4625 required STOP_PC adjustment has already been propagated to the
4626 inferior's regcache. */
4629 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
4631 struct thread_info
*thread
= (struct thread_info
*) entry
;
4632 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4633 struct thread_info
*saved_thread
;
4635 struct process_info
*proc
= get_thread_process (thread
);
4637 /* GDBserver is skipping the extra traps from the wrapper program,
4638 don't have to do step over. */
4639 if (proc
->tdesc
== NULL
)
4642 /* LWPs which will not be resumed are not interesting, because we
4643 might not wait for them next time through linux_wait. */
4648 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4653 if (thread
->last_resume_kind
== resume_stop
)
4656 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4662 gdb_assert (lwp
->suspended
>= 0);
4667 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4672 if (lwp
->status_pending_p
)
4675 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4681 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4685 /* If the PC has changed since we stopped, then don't do anything,
4686 and let the breakpoint/tracepoint be hit. This happens if, for
4687 instance, GDB handled the decr_pc_after_break subtraction itself,
4688 GDB is OOL stepping this thread, or the user has issued a "jump"
4689 command, or poked thread's registers herself. */
4690 if (pc
!= lwp
->stop_pc
)
4693 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4694 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4696 paddress (lwp
->stop_pc
), paddress (pc
));
4700 /* On software single step target, resume the inferior with signal
4701 rather than stepping over. */
4702 if (can_software_single_step ()
4703 && lwp
->pending_signals
!= NULL
4704 && lwp_signal_can_be_delivered (lwp
))
4707 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4714 saved_thread
= current_thread
;
4715 current_thread
= thread
;
4717 /* We can only step over breakpoints we know about. */
4718 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4720 /* Don't step over a breakpoint that GDB expects to hit
4721 though. If the condition is being evaluated on the target's side
4722 and it evaluate to false, step over this breakpoint as well. */
4723 if (gdb_breakpoint_here (pc
)
4724 && gdb_condition_true_at_breakpoint (pc
)
4725 && gdb_no_commands_at_breakpoint (pc
))
4728 debug_printf ("Need step over [LWP %ld]? yes, but found"
4729 " GDB breakpoint at 0x%s; skipping step over\n",
4730 lwpid_of (thread
), paddress (pc
));
4732 current_thread
= saved_thread
;
4738 debug_printf ("Need step over [LWP %ld]? yes, "
4739 "found breakpoint at 0x%s\n",
4740 lwpid_of (thread
), paddress (pc
));
4742 /* We've found an lwp that needs stepping over --- return 1 so
4743 that find_inferior stops looking. */
4744 current_thread
= saved_thread
;
4750 current_thread
= saved_thread
;
4753 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4755 lwpid_of (thread
), paddress (pc
));
4760 /* Start a step-over operation on LWP. When LWP stopped at a
4761 breakpoint, to make progress, we need to remove the breakpoint out
4762 of the way. If we let other threads run while we do that, they may
4763 pass by the breakpoint location and miss hitting it. To avoid
4764 that, a step-over momentarily stops all threads while LWP is
4765 single-stepped by either hardware or software while the breakpoint
4766 is temporarily uninserted from the inferior. When the single-step
4767 finishes, we reinsert the breakpoint, and let all threads that are
4768 supposed to be running, run again. */
4771 start_step_over (struct lwp_info
*lwp
)
4773 struct thread_info
*thread
= get_lwp_thread (lwp
);
4774 struct thread_info
*saved_thread
;
4779 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4782 stop_all_lwps (1, lwp
);
4784 if (lwp
->suspended
!= 0)
4786 internal_error (__FILE__
, __LINE__
,
4787 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4792 debug_printf ("Done stopping all threads for step-over.\n");
4794 /* Note, we should always reach here with an already adjusted PC,
4795 either by GDB (if we're resuming due to GDB's request), or by our
4796 caller, if we just finished handling an internal breakpoint GDB
4797 shouldn't care about. */
4800 saved_thread
= current_thread
;
4801 current_thread
= thread
;
4803 lwp
->bp_reinsert
= pc
;
4804 uninsert_breakpoints_at (pc
);
4805 uninsert_fast_tracepoint_jumps_at (pc
);
4807 step
= single_step (lwp
);
4809 current_thread
= saved_thread
;
4811 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4813 /* Require next event from this LWP. */
4814 step_over_bkpt
= thread
->entry
.id
;
4818 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4819 start_step_over, if still there, and delete any reinsert
4820 breakpoints we've set, on non hardware single-step targets. */
4823 finish_step_over (struct lwp_info
*lwp
)
4825 if (lwp
->bp_reinsert
!= 0)
4827 struct thread_info
*saved_thread
= current_thread
;
4830 debug_printf ("Finished step over.\n");
4832 current_thread
= get_lwp_thread (lwp
);
4834 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4835 may be no breakpoint to reinsert there by now. */
4836 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4837 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4839 lwp
->bp_reinsert
= 0;
4841 /* Delete any software-single-step reinsert breakpoints. No
4842 longer needed. We don't have to worry about other threads
4843 hitting this trap, and later not being able to explain it,
4844 because we were stepping over a breakpoint, and we hold all
4845 threads but LWP stopped while doing that. */
4846 if (!can_hardware_single_step ())
4848 gdb_assert (has_reinsert_breakpoints (current_thread
));
4849 delete_reinsert_breakpoints (current_thread
);
4852 step_over_bkpt
= null_ptid
;
4853 current_thread
= saved_thread
;
4860 /* If there's a step over in progress, wait until all threads stop
4861 (that is, until the stepping thread finishes its step), and
4862 unsuspend all lwps. The stepping thread ends with its status
4863 pending, which is processed later when we get back to processing
4867 complete_ongoing_step_over (void)
4869 if (!ptid_equal (step_over_bkpt
, null_ptid
))
4871 struct lwp_info
*lwp
;
4876 debug_printf ("detach: step over in progress, finish it first\n");
4878 /* Passing NULL_PTID as filter indicates we want all events to
4879 be left pending. Eventually this returns when there are no
4880 unwaited-for children left. */
4881 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4883 gdb_assert (ret
== -1);
4885 lwp
= find_lwp_pid (step_over_bkpt
);
4887 finish_step_over (lwp
);
4888 step_over_bkpt
= null_ptid
;
4889 unsuspend_all_lwps (lwp
);
4893 /* This function is called once per thread. We check the thread's resume
4894 request, which will tell us whether to resume, step, or leave the thread
4895 stopped; and what signal, if any, it should be sent.
4897 For threads which we aren't explicitly told otherwise, we preserve
4898 the stepping flag; this is used for stepping over gdbserver-placed
4901 If pending_flags was set in any thread, we queue any needed
4902 signals, since we won't actually resume. We already have a pending
4903 event to report, so we don't need to preserve any step requests;
4904 they should be re-issued if necessary. */
4907 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
4909 struct thread_info
*thread
= (struct thread_info
*) entry
;
4910 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4912 int leave_all_stopped
= * (int *) arg
;
4915 if (lwp
->resume
== NULL
)
4918 if (lwp
->resume
->kind
== resume_stop
)
4921 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4926 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
4928 /* Stop the thread, and wait for the event asynchronously,
4929 through the event loop. */
4935 debug_printf ("already stopped LWP %ld\n",
4938 /* The LWP may have been stopped in an internal event that
4939 was not meant to be notified back to GDB (e.g., gdbserver
4940 breakpoint), so we should be reporting a stop event in
4943 /* If the thread already has a pending SIGSTOP, this is a
4944 no-op. Otherwise, something later will presumably resume
4945 the thread and this will cause it to cancel any pending
4946 operation, due to last_resume_kind == resume_stop. If
4947 the thread already has a pending status to report, we
4948 will still report it the next time we wait - see
4949 status_pending_p_callback. */
4951 /* If we already have a pending signal to report, then
4952 there's no need to queue a SIGSTOP, as this means we're
4953 midway through moving the LWP out of the jumppad, and we
4954 will report the pending signal as soon as that is
4956 if (lwp
->pending_signals_to_report
== NULL
)
4960 /* For stop requests, we're done. */
4962 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4966 /* If this thread which is about to be resumed has a pending status,
4967 then don't resume it - we can just report the pending status.
4968 Likewise if it is suspended, because e.g., another thread is
4969 stepping past a breakpoint. Make sure to queue any signals that
4970 would otherwise be sent. In all-stop mode, we do this decision
4971 based on if *any* thread has a pending status. If there's a
4972 thread that needs the step-over-breakpoint dance, then don't
4973 resume any other thread but that particular one. */
4974 leave_pending
= (lwp
->suspended
4975 || lwp
->status_pending_p
4976 || leave_all_stopped
);
4981 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
4983 step
= (lwp
->resume
->kind
== resume_step
);
4984 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
4989 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
4991 /* If we have a new signal, enqueue the signal. */
4992 if (lwp
->resume
->sig
!= 0)
4994 struct pending_signals
*p_sig
= XCNEW (struct pending_signals
);
4996 p_sig
->prev
= lwp
->pending_signals
;
4997 p_sig
->signal
= lwp
->resume
->sig
;
4999 /* If this is the same signal we were previously stopped by,
5000 make sure to queue its siginfo. We can ignore the return
5001 value of ptrace; if it fails, we'll skip
5002 PTRACE_SETSIGINFO. */
5003 if (WIFSTOPPED (lwp
->last_status
)
5004 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
5005 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
5008 lwp
->pending_signals
= p_sig
;
5012 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5018 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5020 struct thread_resume_array array
= { resume_info
, n
};
5021 struct thread_info
*need_step_over
= NULL
;
5023 int leave_all_stopped
;
5028 debug_printf ("linux_resume:\n");
5031 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
5033 /* If there is a thread which would otherwise be resumed, which has
5034 a pending status, then don't resume any threads - we can just
5035 report the pending status. Make sure to queue any signals that
5036 would otherwise be sent. In non-stop mode, we'll apply this
5037 logic to each thread individually. We consume all pending events
5038 before considering to start a step-over (in all-stop). */
5041 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
5043 /* If there is a thread which would otherwise be resumed, which is
5044 stopped at a breakpoint that needs stepping over, then don't
5045 resume any threads - have it step over the breakpoint with all
5046 other threads stopped, then resume all threads again. Make sure
5047 to queue any signals that would otherwise be delivered or
5049 if (!any_pending
&& supports_breakpoints ())
5051 = (struct thread_info
*) find_inferior (&all_threads
,
5052 need_step_over_p
, NULL
);
5054 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5058 if (need_step_over
!= NULL
)
5059 debug_printf ("Not resuming all, need step over\n");
5060 else if (any_pending
)
5061 debug_printf ("Not resuming, all-stop and found "
5062 "an LWP with pending status\n");
5064 debug_printf ("Resuming, no pending status or step over needed\n");
5067 /* Even if we're leaving threads stopped, queue all signals we'd
5068 otherwise deliver. */
5069 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
5072 start_step_over (get_thread_lwp (need_step_over
));
5076 debug_printf ("linux_resume done\n");
5080 /* We may have events that were pending that can/should be sent to
5081 the client now. Trigger a linux_wait call. */
5082 if (target_is_async_p ())
5086 /* This function is called once per thread. We check the thread's
5087 last resume request, which will tell us whether to resume, step, or
5088 leave the thread stopped. Any signal the client requested to be
5089 delivered has already been enqueued at this point.
5091 If any thread that GDB wants running is stopped at an internal
5092 breakpoint that needs stepping over, we start a step-over operation
5093 on that particular thread, and leave all others stopped. */
5096 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
5098 struct thread_info
*thread
= (struct thread_info
*) entry
;
5099 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5106 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5111 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5115 if (thread
->last_resume_kind
== resume_stop
5116 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5119 debug_printf (" client wants LWP to remain %ld stopped\n",
5124 if (lwp
->status_pending_p
)
5127 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5132 gdb_assert (lwp
->suspended
>= 0);
5137 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5141 if (thread
->last_resume_kind
== resume_stop
5142 && lwp
->pending_signals_to_report
== NULL
5143 && lwp
->collecting_fast_tracepoint
== 0)
5145 /* We haven't reported this LWP as stopped yet (otherwise, the
5146 last_status.kind check above would catch it, and we wouldn't
5147 reach here. This LWP may have been momentarily paused by a
5148 stop_all_lwps call while handling for example, another LWP's
5149 step-over. In that case, the pending expected SIGSTOP signal
5150 that was queued at vCont;t handling time will have already
5151 been consumed by wait_for_sigstop, and so we need to requeue
5152 another one here. Note that if the LWP already has a SIGSTOP
5153 pending, this is a no-op. */
5156 debug_printf ("Client wants LWP %ld to stop. "
5157 "Making sure it has a SIGSTOP pending\n",
5163 if (thread
->last_resume_kind
== resume_step
)
5166 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5170 else if (lwp
->bp_reinsert
!= 0)
5173 debug_printf (" stepping LWP %ld, reinsert set\n",
5176 step
= maybe_hw_step (thread
);
5181 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5186 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
5188 struct thread_info
*thread
= (struct thread_info
*) entry
;
5189 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5194 lwp_suspended_decr (lwp
);
5196 return proceed_one_lwp (entry
, except
);
5199 /* When we finish a step-over, set threads running again. If there's
5200 another thread that may need a step-over, now's the time to start
5201 it. Eventually, we'll move all threads past their breakpoints. */
5204 proceed_all_lwps (void)
5206 struct thread_info
*need_step_over
;
5208 /* If there is a thread which would otherwise be resumed, which is
5209 stopped at a breakpoint that needs stepping over, then don't
5210 resume any threads - have it step over the breakpoint with all
5211 other threads stopped, then resume all threads again. */
5213 if (supports_breakpoints ())
5216 = (struct thread_info
*) find_inferior (&all_threads
,
5217 need_step_over_p
, NULL
);
5219 if (need_step_over
!= NULL
)
5222 debug_printf ("proceed_all_lwps: found "
5223 "thread %ld needing a step-over\n",
5224 lwpid_of (need_step_over
));
5226 start_step_over (get_thread_lwp (need_step_over
));
5232 debug_printf ("Proceeding, no step-over needed\n");
5234 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
5237 /* Stopped LWPs that the client wanted to be running, that don't have
5238 pending statuses, are set to run again, except for EXCEPT, if not
5239 NULL. This undoes a stop_all_lwps call. */
5242 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5248 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5249 lwpid_of (get_lwp_thread (except
)));
5251 debug_printf ("unstopping all lwps\n");
5255 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
5257 find_inferior (&all_threads
, proceed_one_lwp
, except
);
5261 debug_printf ("unstop_all_lwps done\n");
5267 #ifdef HAVE_LINUX_REGSETS
5269 #define use_linux_regsets 1
5271 /* Returns true if REGSET has been disabled. */
5274 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5276 return (info
->disabled_regsets
!= NULL
5277 && info
->disabled_regsets
[regset
- info
->regsets
]);
5280 /* Disable REGSET. */
5283 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5287 dr_offset
= regset
- info
->regsets
;
5288 if (info
->disabled_regsets
== NULL
)
5289 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5290 info
->disabled_regsets
[dr_offset
] = 1;
5294 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5295 struct regcache
*regcache
)
5297 struct regset_info
*regset
;
5298 int saw_general_regs
= 0;
5302 pid
= lwpid_of (current_thread
);
5303 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5308 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5311 buf
= xmalloc (regset
->size
);
5313 nt_type
= regset
->nt_type
;
5317 iov
.iov_len
= regset
->size
;
5318 data
= (void *) &iov
;
5324 res
= ptrace (regset
->get_request
, pid
,
5325 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5327 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5333 /* If we get EIO on a regset, do not try it again for
5334 this process mode. */
5335 disable_regset (regsets_info
, regset
);
5337 else if (errno
== ENODATA
)
5339 /* ENODATA may be returned if the regset is currently
5340 not "active". This can happen in normal operation,
5341 so suppress the warning in this case. */
5346 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5353 if (regset
->type
== GENERAL_REGS
)
5354 saw_general_regs
= 1;
5355 regset
->store_function (regcache
, buf
);
5359 if (saw_general_regs
)
5366 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5367 struct regcache
*regcache
)
5369 struct regset_info
*regset
;
5370 int saw_general_regs
= 0;
5374 pid
= lwpid_of (current_thread
);
5375 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5380 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5381 || regset
->fill_function
== NULL
)
5384 buf
= xmalloc (regset
->size
);
5386 /* First fill the buffer with the current register set contents,
5387 in case there are any items in the kernel's regset that are
5388 not in gdbserver's regcache. */
5390 nt_type
= regset
->nt_type
;
5394 iov
.iov_len
= regset
->size
;
5395 data
= (void *) &iov
;
5401 res
= ptrace (regset
->get_request
, pid
,
5402 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5404 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5409 /* Then overlay our cached registers on that. */
5410 regset
->fill_function (regcache
, buf
);
5412 /* Only now do we write the register set. */
5414 res
= ptrace (regset
->set_request
, pid
,
5415 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5417 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5425 /* If we get EIO on a regset, do not try it again for
5426 this process mode. */
5427 disable_regset (regsets_info
, regset
);
5429 else if (errno
== ESRCH
)
5431 /* At this point, ESRCH should mean the process is
5432 already gone, in which case we simply ignore attempts
5433 to change its registers. See also the related
5434 comment in linux_resume_one_lwp. */
5440 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5443 else if (regset
->type
== GENERAL_REGS
)
5444 saw_general_regs
= 1;
5447 if (saw_general_regs
)
5453 #else /* !HAVE_LINUX_REGSETS */
5455 #define use_linux_regsets 0
5456 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5457 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5461 /* Return 1 if register REGNO is supported by one of the regset ptrace
5462 calls or 0 if it has to be transferred individually. */
5465 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5467 unsigned char mask
= 1 << (regno
% 8);
5468 size_t index
= regno
/ 8;
5470 return (use_linux_regsets
5471 && (regs_info
->regset_bitmap
== NULL
5472 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5475 #ifdef HAVE_LINUX_USRREGS
5478 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5482 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5483 error ("Invalid register number %d.", regnum
);
5485 addr
= usrregs
->regmap
[regnum
];
5490 /* Fetch one register. */
5492 fetch_register (const struct usrregs_info
*usrregs
,
5493 struct regcache
*regcache
, int regno
)
5500 if (regno
>= usrregs
->num_regs
)
5502 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5505 regaddr
= register_addr (usrregs
, regno
);
5509 size
= ((register_size (regcache
->tdesc
, regno
)
5510 + sizeof (PTRACE_XFER_TYPE
) - 1)
5511 & -sizeof (PTRACE_XFER_TYPE
));
5512 buf
= (char *) alloca (size
);
5514 pid
= lwpid_of (current_thread
);
5515 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5518 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5519 ptrace (PTRACE_PEEKUSER
, pid
,
5520 /* Coerce to a uintptr_t first to avoid potential gcc warning
5521 of coercing an 8 byte integer to a 4 byte pointer. */
5522 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5523 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5525 error ("reading register %d: %s", regno
, strerror (errno
));
5528 if (the_low_target
.supply_ptrace_register
)
5529 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5531 supply_register (regcache
, regno
, buf
);
5534 /* Store one register. */
5536 store_register (const struct usrregs_info
*usrregs
,
5537 struct regcache
*regcache
, int regno
)
5544 if (regno
>= usrregs
->num_regs
)
5546 if ((*the_low_target
.cannot_store_register
) (regno
))
5549 regaddr
= register_addr (usrregs
, regno
);
5553 size
= ((register_size (regcache
->tdesc
, regno
)
5554 + sizeof (PTRACE_XFER_TYPE
) - 1)
5555 & -sizeof (PTRACE_XFER_TYPE
));
5556 buf
= (char *) alloca (size
);
5557 memset (buf
, 0, size
);
5559 if (the_low_target
.collect_ptrace_register
)
5560 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5562 collect_register (regcache
, regno
, buf
);
5564 pid
= lwpid_of (current_thread
);
5565 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5568 ptrace (PTRACE_POKEUSER
, pid
,
5569 /* Coerce to a uintptr_t first to avoid potential gcc warning
5570 about coercing an 8 byte integer to a 4 byte pointer. */
5571 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5572 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5575 /* At this point, ESRCH should mean the process is
5576 already gone, in which case we simply ignore attempts
5577 to change its registers. See also the related
5578 comment in linux_resume_one_lwp. */
5582 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5583 error ("writing register %d: %s", regno
, strerror (errno
));
5585 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5589 /* Fetch all registers, or just one, from the child process.
5590 If REGNO is -1, do this for all registers, skipping any that are
5591 assumed to have been retrieved by regsets_fetch_inferior_registers,
5592 unless ALL is non-zero.
5593 Otherwise, REGNO specifies which register (so we can save time). */
5595 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5596 struct regcache
*regcache
, int regno
, int all
)
5598 struct usrregs_info
*usr
= regs_info
->usrregs
;
5602 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5603 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5604 fetch_register (usr
, regcache
, regno
);
5607 fetch_register (usr
, regcache
, regno
);
5610 /* Store our register values back into the inferior.
5611 If REGNO is -1, do this for all registers, skipping any that are
5612 assumed to have been saved by regsets_store_inferior_registers,
5613 unless ALL is non-zero.
5614 Otherwise, REGNO specifies which register (so we can save time). */
5616 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5617 struct regcache
*regcache
, int regno
, int all
)
5619 struct usrregs_info
*usr
= regs_info
->usrregs
;
5623 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5624 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5625 store_register (usr
, regcache
, regno
);
5628 store_register (usr
, regcache
, regno
);
5631 #else /* !HAVE_LINUX_USRREGS */
5633 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5634 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5640 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5644 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5648 if (the_low_target
.fetch_register
!= NULL
5649 && regs_info
->usrregs
!= NULL
)
5650 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5651 (*the_low_target
.fetch_register
) (regcache
, regno
);
5653 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5654 if (regs_info
->usrregs
!= NULL
)
5655 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5659 if (the_low_target
.fetch_register
!= NULL
5660 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5663 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5665 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5667 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5668 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5673 linux_store_registers (struct regcache
*regcache
, int regno
)
5677 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5681 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5683 if (regs_info
->usrregs
!= NULL
)
5684 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5688 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5690 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5692 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5693 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5698 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5699 to debugger memory starting at MYADDR. */
5702 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5704 int pid
= lwpid_of (current_thread
);
5705 register PTRACE_XFER_TYPE
*buffer
;
5706 register CORE_ADDR addr
;
5713 /* Try using /proc. Don't bother for one word. */
5714 if (len
>= 3 * sizeof (long))
5718 /* We could keep this file open and cache it - possibly one per
5719 thread. That requires some juggling, but is even faster. */
5720 sprintf (filename
, "/proc/%d/mem", pid
);
5721 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5725 /* If pread64 is available, use it. It's faster if the kernel
5726 supports it (only one syscall), and it's 64-bit safe even on
5727 32-bit platforms (for instance, SPARC debugging a SPARC64
5730 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5733 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5734 bytes
= read (fd
, myaddr
, len
);
5741 /* Some data was read, we'll try to get the rest with ptrace. */
5751 /* Round starting address down to longword boundary. */
5752 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5753 /* Round ending address up; get number of longwords that makes. */
5754 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5755 / sizeof (PTRACE_XFER_TYPE
));
5756 /* Allocate buffer of that many longwords. */
5757 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5759 /* Read all the longwords */
5761 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5763 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5764 about coercing an 8 byte integer to a 4 byte pointer. */
5765 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5766 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5767 (PTRACE_TYPE_ARG4
) 0);
5773 /* Copy appropriate bytes out of the buffer. */
5776 i
*= sizeof (PTRACE_XFER_TYPE
);
5777 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5779 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5786 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5787 memory at MEMADDR. On failure (cannot write to the inferior)
5788 returns the value of errno. Always succeeds if LEN is zero. */
5791 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5794 /* Round starting address down to longword boundary. */
5795 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5796 /* Round ending address up; get number of longwords that makes. */
5798 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5799 / sizeof (PTRACE_XFER_TYPE
);
5801 /* Allocate buffer of that many longwords. */
5802 register PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5804 int pid
= lwpid_of (current_thread
);
5808 /* Zero length write always succeeds. */
5814 /* Dump up to four bytes. */
5815 char str
[4 * 2 + 1];
5817 int dump
= len
< 4 ? len
: 4;
5819 for (i
= 0; i
< dump
; i
++)
5821 sprintf (p
, "%02x", myaddr
[i
]);
5826 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5827 str
, (long) memaddr
, pid
);
5830 /* Fill start and end extra bytes of buffer with existing memory data. */
5833 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5834 about coercing an 8 byte integer to a 4 byte pointer. */
5835 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5836 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5837 (PTRACE_TYPE_ARG4
) 0);
5845 = ptrace (PTRACE_PEEKTEXT
, pid
,
5846 /* Coerce to a uintptr_t first to avoid potential gcc warning
5847 about coercing an 8 byte integer to a 4 byte pointer. */
5848 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5849 * sizeof (PTRACE_XFER_TYPE
)),
5850 (PTRACE_TYPE_ARG4
) 0);
5855 /* Copy data to be written over corresponding part of buffer. */
5857 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5860 /* Write the entire buffer. */
5862 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5865 ptrace (PTRACE_POKETEXT
, pid
,
5866 /* Coerce to a uintptr_t first to avoid potential gcc warning
5867 about coercing an 8 byte integer to a 4 byte pointer. */
5868 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5869 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5878 linux_look_up_symbols (void)
5880 #ifdef USE_THREAD_DB
5881 struct process_info
*proc
= current_process ();
5883 if (proc
->priv
->thread_db
!= NULL
)
5891 linux_request_interrupt (void)
5893 extern unsigned long signal_pid
;
5895 /* Send a SIGINT to the process group. This acts just like the user
5896 typed a ^C on the controlling terminal. */
5897 kill (-signal_pid
, SIGINT
);
5900 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5901 to debugger memory starting at MYADDR. */
5904 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5906 char filename
[PATH_MAX
];
5908 int pid
= lwpid_of (current_thread
);
5910 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5912 fd
= open (filename
, O_RDONLY
);
5916 if (offset
!= (CORE_ADDR
) 0
5917 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5920 n
= read (fd
, myaddr
, len
);
5927 /* These breakpoint and watchpoint related wrapper functions simply
5928 pass on the function call if the target has registered a
5929 corresponding function. */
5932 linux_supports_z_point_type (char z_type
)
5934 return (the_low_target
.supports_z_point_type
!= NULL
5935 && the_low_target
.supports_z_point_type (z_type
));
5939 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5940 int size
, struct raw_breakpoint
*bp
)
5942 if (type
== raw_bkpt_type_sw
)
5943 return insert_memory_breakpoint (bp
);
5944 else if (the_low_target
.insert_point
!= NULL
)
5945 return the_low_target
.insert_point (type
, addr
, size
, bp
);
5947 /* Unsupported (see target.h). */
5952 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5953 int size
, struct raw_breakpoint
*bp
)
5955 if (type
== raw_bkpt_type_sw
)
5956 return remove_memory_breakpoint (bp
);
5957 else if (the_low_target
.remove_point
!= NULL
)
5958 return the_low_target
.remove_point (type
, addr
, size
, bp
);
5960 /* Unsupported (see target.h). */
5964 /* Implement the to_stopped_by_sw_breakpoint target_ops
5968 linux_stopped_by_sw_breakpoint (void)
5970 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5972 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
5975 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
5979 linux_supports_stopped_by_sw_breakpoint (void)
5981 return USE_SIGTRAP_SIGINFO
;
5984 /* Implement the to_stopped_by_hw_breakpoint target_ops
5988 linux_stopped_by_hw_breakpoint (void)
5990 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5992 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
5995 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
5999 linux_supports_stopped_by_hw_breakpoint (void)
6001 return USE_SIGTRAP_SIGINFO
;
6004 /* Implement the supports_hardware_single_step target_ops method. */
6007 linux_supports_hardware_single_step (void)
6009 return can_hardware_single_step ();
6013 linux_supports_software_single_step (void)
6015 return can_software_single_step ();
6019 linux_stopped_by_watchpoint (void)
6021 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6023 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6027 linux_stopped_data_address (void)
6029 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6031 return lwp
->stopped_data_address
;
6034 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6035 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6036 && defined(PT_TEXT_END_ADDR)
6038 /* This is only used for targets that define PT_TEXT_ADDR,
6039 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6040 the target has different ways of acquiring this information, like
6043 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6044 to tell gdb about. */
6047 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6049 unsigned long text
, text_end
, data
;
6050 int pid
= lwpid_of (current_thread
);
6054 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6055 (PTRACE_TYPE_ARG4
) 0);
6056 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6057 (PTRACE_TYPE_ARG4
) 0);
6058 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6059 (PTRACE_TYPE_ARG4
) 0);
6063 /* Both text and data offsets produced at compile-time (and so
6064 used by gdb) are relative to the beginning of the program,
6065 with the data segment immediately following the text segment.
6066 However, the actual runtime layout in memory may put the data
6067 somewhere else, so when we send gdb a data base-address, we
6068 use the real data base address and subtract the compile-time
6069 data base-address from it (which is just the length of the
6070 text segment). BSS immediately follows data in both
6073 *data_p
= data
- (text_end
- text
);
6082 linux_qxfer_osdata (const char *annex
,
6083 unsigned char *readbuf
, unsigned const char *writebuf
,
6084 CORE_ADDR offset
, int len
)
6086 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6089 /* Convert a native/host siginfo object, into/from the siginfo in the
6090 layout of the inferiors' architecture. */
6093 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6097 if (the_low_target
.siginfo_fixup
!= NULL
)
6098 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6100 /* If there was no callback, or the callback didn't do anything,
6101 then just do a straight memcpy. */
6105 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6107 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6112 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6113 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6117 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6119 if (current_thread
== NULL
)
6122 pid
= lwpid_of (current_thread
);
6125 debug_printf ("%s siginfo for lwp %d.\n",
6126 readbuf
!= NULL
? "Reading" : "Writing",
6129 if (offset
>= sizeof (siginfo
))
6132 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6135 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6136 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6137 inferior with a 64-bit GDBSERVER should look the same as debugging it
6138 with a 32-bit GDBSERVER, we need to convert it. */
6139 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6141 if (offset
+ len
> sizeof (siginfo
))
6142 len
= sizeof (siginfo
) - offset
;
6144 if (readbuf
!= NULL
)
6145 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6148 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6150 /* Convert back to ptrace layout before flushing it out. */
6151 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6153 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6160 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6161 so we notice when children change state; as the handler for the
6162 sigsuspend in my_waitpid. */
6165 sigchld_handler (int signo
)
6167 int old_errno
= errno
;
6173 /* fprintf is not async-signal-safe, so call write
6175 if (write (2, "sigchld_handler\n",
6176 sizeof ("sigchld_handler\n") - 1) < 0)
6177 break; /* just ignore */
6181 if (target_is_async_p ())
6182 async_file_mark (); /* trigger a linux_wait */
6188 linux_supports_non_stop (void)
6194 linux_async (int enable
)
6196 int previous
= target_is_async_p ();
6199 debug_printf ("linux_async (%d), previous=%d\n",
6202 if (previous
!= enable
)
6205 sigemptyset (&mask
);
6206 sigaddset (&mask
, SIGCHLD
);
6208 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6212 if (pipe (linux_event_pipe
) == -1)
6214 linux_event_pipe
[0] = -1;
6215 linux_event_pipe
[1] = -1;
6216 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6218 warning ("creating event pipe failed.");
6222 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6223 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6225 /* Register the event loop handler. */
6226 add_file_handler (linux_event_pipe
[0],
6227 handle_target_event
, NULL
);
6229 /* Always trigger a linux_wait. */
6234 delete_file_handler (linux_event_pipe
[0]);
6236 close (linux_event_pipe
[0]);
6237 close (linux_event_pipe
[1]);
6238 linux_event_pipe
[0] = -1;
6239 linux_event_pipe
[1] = -1;
6242 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6249 linux_start_non_stop (int nonstop
)
6251 /* Register or unregister from event-loop accordingly. */
6252 linux_async (nonstop
);
6254 if (target_is_async_p () != (nonstop
!= 0))
6261 linux_supports_multi_process (void)
6266 /* Check if fork events are supported. */
6269 linux_supports_fork_events (void)
6271 return linux_supports_tracefork ();
6274 /* Check if vfork events are supported. */
6277 linux_supports_vfork_events (void)
6279 return linux_supports_tracefork ();
6282 /* Check if exec events are supported. */
6285 linux_supports_exec_events (void)
6287 return linux_supports_traceexec ();
6290 /* Callback for 'find_inferior'. Set the (possibly changed) ptrace
6291 options for the specified lwp. */
6294 reset_lwp_ptrace_options_callback (struct inferior_list_entry
*entry
,
6297 struct thread_info
*thread
= (struct thread_info
*) entry
;
6298 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6302 /* Stop the lwp so we can modify its ptrace options. */
6303 lwp
->must_set_ptrace_flags
= 1;
6304 linux_stop_lwp (lwp
);
6308 /* Already stopped; go ahead and set the ptrace options. */
6309 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6310 int options
= linux_low_ptrace_options (proc
->attached
);
6312 linux_enable_event_reporting (lwpid_of (thread
), options
);
6313 lwp
->must_set_ptrace_flags
= 0;
6319 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6320 ptrace flags for all inferiors. This is in case the new GDB connection
6321 doesn't support the same set of events that the previous one did. */
6324 linux_handle_new_gdb_connection (void)
6328 /* Request that all the lwps reset their ptrace options. */
6329 find_inferior (&all_threads
, reset_lwp_ptrace_options_callback
, &pid
);
6333 linux_supports_disable_randomization (void)
6335 #ifdef HAVE_PERSONALITY
6343 linux_supports_agent (void)
6349 linux_supports_range_stepping (void)
6351 if (*the_low_target
.supports_range_stepping
== NULL
)
6354 return (*the_low_target
.supports_range_stepping
) ();
6357 /* Enumerate spufs IDs for process PID. */
6359 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6365 struct dirent
*entry
;
6367 sprintf (path
, "/proc/%ld/fd", pid
);
6368 dir
= opendir (path
);
6373 while ((entry
= readdir (dir
)) != NULL
)
6379 fd
= atoi (entry
->d_name
);
6383 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6384 if (stat (path
, &st
) != 0)
6386 if (!S_ISDIR (st
.st_mode
))
6389 if (statfs (path
, &stfs
) != 0)
6391 if (stfs
.f_type
!= SPUFS_MAGIC
)
6394 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6396 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6406 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6407 object type, using the /proc file system. */
6409 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6410 unsigned const char *writebuf
,
6411 CORE_ADDR offset
, int len
)
6413 long pid
= lwpid_of (current_thread
);
6418 if (!writebuf
&& !readbuf
)
6426 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6429 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6430 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6435 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6442 ret
= write (fd
, writebuf
, (size_t) len
);
6444 ret
= read (fd
, readbuf
, (size_t) len
);
6450 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6451 struct target_loadseg
6453 /* Core address to which the segment is mapped. */
6455 /* VMA recorded in the program header. */
6457 /* Size of this segment in memory. */
6461 # if defined PT_GETDSBT
6462 struct target_loadmap
6464 /* Protocol version number, must be zero. */
6466 /* Pointer to the DSBT table, its size, and the DSBT index. */
6467 unsigned *dsbt_table
;
6468 unsigned dsbt_size
, dsbt_index
;
6469 /* Number of segments in this map. */
6471 /* The actual memory map. */
6472 struct target_loadseg segs
[/*nsegs*/];
6474 # define LINUX_LOADMAP PT_GETDSBT
6475 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6476 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6478 struct target_loadmap
6480 /* Protocol version number, must be zero. */
6482 /* Number of segments in this map. */
6484 /* The actual memory map. */
6485 struct target_loadseg segs
[/*nsegs*/];
6487 # define LINUX_LOADMAP PTRACE_GETFDPIC
6488 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6489 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6493 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6494 unsigned char *myaddr
, unsigned int len
)
6496 int pid
= lwpid_of (current_thread
);
6498 struct target_loadmap
*data
= NULL
;
6499 unsigned int actual_length
, copy_length
;
6501 if (strcmp (annex
, "exec") == 0)
6502 addr
= (int) LINUX_LOADMAP_EXEC
;
6503 else if (strcmp (annex
, "interp") == 0)
6504 addr
= (int) LINUX_LOADMAP_INTERP
;
6508 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6514 actual_length
= sizeof (struct target_loadmap
)
6515 + sizeof (struct target_loadseg
) * data
->nsegs
;
6517 if (offset
< 0 || offset
> actual_length
)
6520 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6521 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6525 # define linux_read_loadmap NULL
6526 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6529 linux_process_qsupported (char **features
, int count
)
6531 if (the_low_target
.process_qsupported
!= NULL
)
6532 the_low_target
.process_qsupported (features
, count
);
6536 linux_supports_catch_syscall (void)
6538 return (the_low_target
.get_syscall_trapinfo
!= NULL
6539 && linux_supports_tracesysgood ());
6543 linux_get_ipa_tdesc_idx (void)
6545 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6548 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6552 linux_supports_tracepoints (void)
6554 if (*the_low_target
.supports_tracepoints
== NULL
)
6557 return (*the_low_target
.supports_tracepoints
) ();
6561 linux_read_pc (struct regcache
*regcache
)
6563 if (the_low_target
.get_pc
== NULL
)
6566 return (*the_low_target
.get_pc
) (regcache
);
6570 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6572 gdb_assert (the_low_target
.set_pc
!= NULL
);
6574 (*the_low_target
.set_pc
) (regcache
, pc
);
6578 linux_thread_stopped (struct thread_info
*thread
)
6580 return get_thread_lwp (thread
)->stopped
;
6583 /* This exposes stop-all-threads functionality to other modules. */
6586 linux_pause_all (int freeze
)
6588 stop_all_lwps (freeze
, NULL
);
6591 /* This exposes unstop-all-threads functionality to other gdbserver
6595 linux_unpause_all (int unfreeze
)
6597 unstop_all_lwps (unfreeze
, NULL
);
6601 linux_prepare_to_access_memory (void)
6603 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6606 linux_pause_all (1);
6611 linux_done_accessing_memory (void)
6613 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6616 linux_unpause_all (1);
6620 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6621 CORE_ADDR collector
,
6624 CORE_ADDR
*jump_entry
,
6625 CORE_ADDR
*trampoline
,
6626 ULONGEST
*trampoline_size
,
6627 unsigned char *jjump_pad_insn
,
6628 ULONGEST
*jjump_pad_insn_size
,
6629 CORE_ADDR
*adjusted_insn_addr
,
6630 CORE_ADDR
*adjusted_insn_addr_end
,
6633 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6634 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6635 jump_entry
, trampoline
, trampoline_size
,
6636 jjump_pad_insn
, jjump_pad_insn_size
,
6637 adjusted_insn_addr
, adjusted_insn_addr_end
,
6641 static struct emit_ops
*
6642 linux_emit_ops (void)
6644 if (the_low_target
.emit_ops
!= NULL
)
6645 return (*the_low_target
.emit_ops
) ();
6651 linux_get_min_fast_tracepoint_insn_len (void)
6653 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6656 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6659 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6660 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6662 char filename
[PATH_MAX
];
6664 const int auxv_size
= is_elf64
6665 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6666 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6668 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6670 fd
= open (filename
, O_RDONLY
);
6676 while (read (fd
, buf
, auxv_size
) == auxv_size
6677 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6681 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6683 switch (aux
->a_type
)
6686 *phdr_memaddr
= aux
->a_un
.a_val
;
6689 *num_phdr
= aux
->a_un
.a_val
;
6695 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6697 switch (aux
->a_type
)
6700 *phdr_memaddr
= aux
->a_un
.a_val
;
6703 *num_phdr
= aux
->a_un
.a_val
;
6711 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6713 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6714 "phdr_memaddr = %ld, phdr_num = %d",
6715 (long) *phdr_memaddr
, *num_phdr
);
6722 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6725 get_dynamic (const int pid
, const int is_elf64
)
6727 CORE_ADDR phdr_memaddr
, relocation
;
6729 unsigned char *phdr_buf
;
6730 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6732 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6735 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6736 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6738 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6741 /* Compute relocation: it is expected to be 0 for "regular" executables,
6742 non-zero for PIE ones. */
6744 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6747 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6749 if (p
->p_type
== PT_PHDR
)
6750 relocation
= phdr_memaddr
- p
->p_vaddr
;
6754 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6756 if (p
->p_type
== PT_PHDR
)
6757 relocation
= phdr_memaddr
- p
->p_vaddr
;
6760 if (relocation
== -1)
6762 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6763 any real world executables, including PIE executables, have always
6764 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6765 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6766 or present DT_DEBUG anyway (fpc binaries are statically linked).
6768 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6770 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6775 for (i
= 0; i
< num_phdr
; i
++)
6779 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6781 if (p
->p_type
== PT_DYNAMIC
)
6782 return p
->p_vaddr
+ relocation
;
6786 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6788 if (p
->p_type
== PT_DYNAMIC
)
6789 return p
->p_vaddr
+ relocation
;
6796 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6797 can be 0 if the inferior does not yet have the library list initialized.
6798 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6799 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6802 get_r_debug (const int pid
, const int is_elf64
)
6804 CORE_ADDR dynamic_memaddr
;
6805 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6806 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6809 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6810 if (dynamic_memaddr
== 0)
6813 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6817 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6818 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6822 unsigned char buf
[sizeof (Elf64_Xword
)];
6826 #ifdef DT_MIPS_RLD_MAP
6827 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6829 if (linux_read_memory (dyn
->d_un
.d_val
,
6830 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6835 #endif /* DT_MIPS_RLD_MAP */
6836 #ifdef DT_MIPS_RLD_MAP_REL
6837 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6839 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6840 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6845 #endif /* DT_MIPS_RLD_MAP_REL */
6847 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6848 map
= dyn
->d_un
.d_val
;
6850 if (dyn
->d_tag
== DT_NULL
)
6855 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6856 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6860 unsigned char buf
[sizeof (Elf32_Word
)];
6864 #ifdef DT_MIPS_RLD_MAP
6865 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6867 if (linux_read_memory (dyn
->d_un
.d_val
,
6868 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6873 #endif /* DT_MIPS_RLD_MAP */
6874 #ifdef DT_MIPS_RLD_MAP_REL
6875 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6877 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6878 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6883 #endif /* DT_MIPS_RLD_MAP_REL */
6885 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6886 map
= dyn
->d_un
.d_val
;
6888 if (dyn
->d_tag
== DT_NULL
)
6892 dynamic_memaddr
+= dyn_size
;
6898 /* Read one pointer from MEMADDR in the inferior. */
6901 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6905 /* Go through a union so this works on either big or little endian
6906 hosts, when the inferior's pointer size is smaller than the size
6907 of CORE_ADDR. It is assumed the inferior's endianness is the
6908 same of the superior's. */
6911 CORE_ADDR core_addr
;
6916 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6919 if (ptr_size
== sizeof (CORE_ADDR
))
6920 *ptr
= addr
.core_addr
;
6921 else if (ptr_size
== sizeof (unsigned int))
6924 gdb_assert_not_reached ("unhandled pointer size");
6929 struct link_map_offsets
6931 /* Offset and size of r_debug.r_version. */
6932 int r_version_offset
;
6934 /* Offset and size of r_debug.r_map. */
6937 /* Offset to l_addr field in struct link_map. */
6940 /* Offset to l_name field in struct link_map. */
6943 /* Offset to l_ld field in struct link_map. */
6946 /* Offset to l_next field in struct link_map. */
6949 /* Offset to l_prev field in struct link_map. */
6953 /* Construct qXfer:libraries-svr4:read reply. */
6956 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
6957 unsigned const char *writebuf
,
6958 CORE_ADDR offset
, int len
)
6961 unsigned document_len
;
6962 struct process_info_private
*const priv
= current_process ()->priv
;
6963 char filename
[PATH_MAX
];
6966 static const struct link_map_offsets lmo_32bit_offsets
=
6968 0, /* r_version offset. */
6969 4, /* r_debug.r_map offset. */
6970 0, /* l_addr offset in link_map. */
6971 4, /* l_name offset in link_map. */
6972 8, /* l_ld offset in link_map. */
6973 12, /* l_next offset in link_map. */
6974 16 /* l_prev offset in link_map. */
6977 static const struct link_map_offsets lmo_64bit_offsets
=
6979 0, /* r_version offset. */
6980 8, /* r_debug.r_map offset. */
6981 0, /* l_addr offset in link_map. */
6982 8, /* l_name offset in link_map. */
6983 16, /* l_ld offset in link_map. */
6984 24, /* l_next offset in link_map. */
6985 32 /* l_prev offset in link_map. */
6987 const struct link_map_offsets
*lmo
;
6988 unsigned int machine
;
6990 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
6991 int allocated
= 1024;
6993 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
6994 int header_done
= 0;
6996 if (writebuf
!= NULL
)
6998 if (readbuf
== NULL
)
7001 pid
= lwpid_of (current_thread
);
7002 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7003 is_elf64
= elf_64_file_p (filename
, &machine
);
7004 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7005 ptr_size
= is_elf64
? 8 : 4;
7007 while (annex
[0] != '\0')
7013 sep
= strchr (annex
, '=');
7018 if (len
== 5 && startswith (annex
, "start"))
7020 else if (len
== 4 && startswith (annex
, "prev"))
7024 annex
= strchr (sep
, ';');
7031 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7038 if (priv
->r_debug
== 0)
7039 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7041 /* We failed to find DT_DEBUG. Such situation will not change
7042 for this inferior - do not retry it. Report it to GDB as
7043 E01, see for the reasons at the GDB solib-svr4.c side. */
7044 if (priv
->r_debug
== (CORE_ADDR
) -1)
7047 if (priv
->r_debug
!= 0)
7049 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7050 (unsigned char *) &r_version
,
7051 sizeof (r_version
)) != 0
7054 warning ("unexpected r_debug version %d", r_version
);
7056 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7057 &lm_addr
, ptr_size
) != 0)
7059 warning ("unable to read r_map from 0x%lx",
7060 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7065 document
= (char *) xmalloc (allocated
);
7066 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7067 p
= document
+ strlen (document
);
7070 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7071 &l_name
, ptr_size
) == 0
7072 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7073 &l_addr
, ptr_size
) == 0
7074 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7075 &l_ld
, ptr_size
) == 0
7076 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7077 &l_prev
, ptr_size
) == 0
7078 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7079 &l_next
, ptr_size
) == 0)
7081 unsigned char libname
[PATH_MAX
];
7083 if (lm_prev
!= l_prev
)
7085 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7086 (long) lm_prev
, (long) l_prev
);
7090 /* Ignore the first entry even if it has valid name as the first entry
7091 corresponds to the main executable. The first entry should not be
7092 skipped if the dynamic loader was loaded late by a static executable
7093 (see solib-svr4.c parameter ignore_first). But in such case the main
7094 executable does not have PT_DYNAMIC present and this function already
7095 exited above due to failed get_r_debug. */
7098 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7103 /* Not checking for error because reading may stop before
7104 we've got PATH_MAX worth of characters. */
7106 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7107 libname
[sizeof (libname
) - 1] = '\0';
7108 if (libname
[0] != '\0')
7110 /* 6x the size for xml_escape_text below. */
7111 size_t len
= 6 * strlen ((char *) libname
);
7116 /* Terminate `<library-list-svr4'. */
7121 while (allocated
< p
- document
+ len
+ 200)
7123 /* Expand to guarantee sufficient storage. */
7124 uintptr_t document_len
= p
- document
;
7126 document
= (char *) xrealloc (document
, 2 * allocated
);
7128 p
= document
+ document_len
;
7131 name
= xml_escape_text ((char *) libname
);
7132 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7133 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7134 name
, (unsigned long) lm_addr
,
7135 (unsigned long) l_addr
, (unsigned long) l_ld
);
7146 /* Empty list; terminate `<library-list-svr4'. */
7150 strcpy (p
, "</library-list-svr4>");
7152 document_len
= strlen (document
);
7153 if (offset
< document_len
)
7154 document_len
-= offset
;
7157 if (len
> document_len
)
7160 memcpy (readbuf
, document
+ offset
, len
);
7166 #ifdef HAVE_LINUX_BTRACE
7168 /* See to_disable_btrace target method. */
7171 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7173 enum btrace_error err
;
7175 err
= linux_disable_btrace (tinfo
);
7176 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7179 /* Encode an Intel Processor Trace configuration. */
7182 linux_low_encode_pt_config (struct buffer
*buffer
,
7183 const struct btrace_data_pt_config
*config
)
7185 buffer_grow_str (buffer
, "<pt-config>\n");
7187 switch (config
->cpu
.vendor
)
7190 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7191 "model=\"%u\" stepping=\"%u\"/>\n",
7192 config
->cpu
.family
, config
->cpu
.model
,
7193 config
->cpu
.stepping
);
7200 buffer_grow_str (buffer
, "</pt-config>\n");
7203 /* Encode a raw buffer. */
7206 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7212 /* We use hex encoding - see common/rsp-low.h. */
7213 buffer_grow_str (buffer
, "<raw>\n");
7219 elem
[0] = tohex ((*data
>> 4) & 0xf);
7220 elem
[1] = tohex (*data
++ & 0xf);
7222 buffer_grow (buffer
, elem
, 2);
7225 buffer_grow_str (buffer
, "</raw>\n");
7228 /* See to_read_btrace target method. */
7231 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7232 enum btrace_read_type type
)
7234 struct btrace_data btrace
;
7235 struct btrace_block
*block
;
7236 enum btrace_error err
;
7239 btrace_data_init (&btrace
);
7241 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7242 if (err
!= BTRACE_ERR_NONE
)
7244 if (err
== BTRACE_ERR_OVERFLOW
)
7245 buffer_grow_str0 (buffer
, "E.Overflow.");
7247 buffer_grow_str0 (buffer
, "E.Generic Error.");
7252 switch (btrace
.format
)
7254 case BTRACE_FORMAT_NONE
:
7255 buffer_grow_str0 (buffer
, "E.No Trace.");
7258 case BTRACE_FORMAT_BTS
:
7259 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7260 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7263 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7265 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7266 paddress (block
->begin
), paddress (block
->end
));
7268 buffer_grow_str0 (buffer
, "</btrace>\n");
7271 case BTRACE_FORMAT_PT
:
7272 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7273 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7274 buffer_grow_str (buffer
, "<pt>\n");
7276 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7278 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7279 btrace
.variant
.pt
.size
);
7281 buffer_grow_str (buffer
, "</pt>\n");
7282 buffer_grow_str0 (buffer
, "</btrace>\n");
7286 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7290 btrace_data_fini (&btrace
);
7294 btrace_data_fini (&btrace
);
7298 /* See to_btrace_conf target method. */
7301 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7302 struct buffer
*buffer
)
7304 const struct btrace_config
*conf
;
7306 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7307 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7309 conf
= linux_btrace_conf (tinfo
);
7312 switch (conf
->format
)
7314 case BTRACE_FORMAT_NONE
:
7317 case BTRACE_FORMAT_BTS
:
7318 buffer_xml_printf (buffer
, "<bts");
7319 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7320 buffer_xml_printf (buffer
, " />\n");
7323 case BTRACE_FORMAT_PT
:
7324 buffer_xml_printf (buffer
, "<pt");
7325 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7326 buffer_xml_printf (buffer
, "/>\n");
7331 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7334 #endif /* HAVE_LINUX_BTRACE */
7336 /* See nat/linux-nat.h. */
7339 current_lwp_ptid (void)
7341 return ptid_of (current_thread
);
7344 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7347 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7349 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7350 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7352 return default_breakpoint_kind_from_pc (pcptr
);
7355 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7357 static const gdb_byte
*
7358 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7360 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7362 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7365 /* Implementation of the target_ops method
7366 "breakpoint_kind_from_current_state". */
7369 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7371 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7372 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7374 return linux_breakpoint_kind_from_pc (pcptr
);
7377 /* Default implementation of linux_target_ops method "set_pc" for
7378 32-bit pc register which is literally named "pc". */
7381 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7383 uint32_t newpc
= pc
;
7385 supply_register_by_name (regcache
, "pc", &newpc
);
7388 /* Default implementation of linux_target_ops method "get_pc" for
7389 32-bit pc register which is literally named "pc". */
7392 linux_get_pc_32bit (struct regcache
*regcache
)
7396 collect_register_by_name (regcache
, "pc", &pc
);
7398 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7402 /* Default implementation of linux_target_ops method "set_pc" for
7403 64-bit pc register which is literally named "pc". */
7406 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7408 uint64_t newpc
= pc
;
7410 supply_register_by_name (regcache
, "pc", &newpc
);
7413 /* Default implementation of linux_target_ops method "get_pc" for
7414 64-bit pc register which is literally named "pc". */
7417 linux_get_pc_64bit (struct regcache
*regcache
)
7421 collect_register_by_name (regcache
, "pc", &pc
);
7423 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7428 static struct target_ops linux_target_ops
= {
7429 linux_create_inferior
,
7430 linux_post_create_inferior
,
7439 linux_fetch_registers
,
7440 linux_store_registers
,
7441 linux_prepare_to_access_memory
,
7442 linux_done_accessing_memory
,
7445 linux_look_up_symbols
,
7446 linux_request_interrupt
,
7448 linux_supports_z_point_type
,
7451 linux_stopped_by_sw_breakpoint
,
7452 linux_supports_stopped_by_sw_breakpoint
,
7453 linux_stopped_by_hw_breakpoint
,
7454 linux_supports_stopped_by_hw_breakpoint
,
7455 linux_supports_hardware_single_step
,
7456 linux_stopped_by_watchpoint
,
7457 linux_stopped_data_address
,
7458 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7459 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7460 && defined(PT_TEXT_END_ADDR)
7465 #ifdef USE_THREAD_DB
7466 thread_db_get_tls_address
,
7471 hostio_last_error_from_errno
,
7474 linux_supports_non_stop
,
7476 linux_start_non_stop
,
7477 linux_supports_multi_process
,
7478 linux_supports_fork_events
,
7479 linux_supports_vfork_events
,
7480 linux_supports_exec_events
,
7481 linux_handle_new_gdb_connection
,
7482 #ifdef USE_THREAD_DB
7483 thread_db_handle_monitor_command
,
7487 linux_common_core_of_thread
,
7489 linux_process_qsupported
,
7490 linux_supports_tracepoints
,
7493 linux_thread_stopped
,
7497 linux_stabilize_threads
,
7498 linux_install_fast_tracepoint_jump_pad
,
7500 linux_supports_disable_randomization
,
7501 linux_get_min_fast_tracepoint_insn_len
,
7502 linux_qxfer_libraries_svr4
,
7503 linux_supports_agent
,
7504 #ifdef HAVE_LINUX_BTRACE
7505 linux_supports_btrace
,
7506 linux_enable_btrace
,
7507 linux_low_disable_btrace
,
7508 linux_low_read_btrace
,
7509 linux_low_btrace_conf
,
7517 linux_supports_range_stepping
,
7518 linux_proc_pid_to_exec_file
,
7519 linux_mntns_open_cloexec
,
7521 linux_mntns_readlink
,
7522 linux_breakpoint_kind_from_pc
,
7523 linux_sw_breakpoint_from_kind
,
7524 linux_proc_tid_get_name
,
7525 linux_breakpoint_kind_from_current_state
,
7526 linux_supports_software_single_step
,
7527 linux_supports_catch_syscall
,
7528 linux_get_ipa_tdesc_idx
,
7531 #ifdef HAVE_LINUX_REGSETS
7533 initialize_regsets_info (struct regsets_info
*info
)
7535 for (info
->num_regsets
= 0;
7536 info
->regsets
[info
->num_regsets
].size
>= 0;
7537 info
->num_regsets
++)
7543 initialize_low (void)
7545 struct sigaction sigchld_action
;
7547 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7548 set_target_ops (&linux_target_ops
);
7550 linux_ptrace_init_warnings ();
7552 sigchld_action
.sa_handler
= sigchld_handler
;
7553 sigemptyset (&sigchld_action
.sa_mask
);
7554 sigchld_action
.sa_flags
= SA_RESTART
;
7555 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7557 initialize_low_arch ();
7559 linux_check_ptrace_features ();