1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2020 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"
22 #include "gdbsupport/agent.h"
24 #include "gdbsupport/rsp-low.h"
25 #include "gdbsupport/signals-state-save-restore.h"
26 #include "nat/linux-nat.h"
27 #include "nat/linux-waitpid.h"
28 #include "gdbsupport/gdb_wait.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 "gdbsupport/filestuff.h"
47 #include "tracepoint.h"
49 #include "gdbsupport/common-inferior.h"
50 #include "nat/fork-inferior.h"
51 #include "gdbsupport/environ.h"
52 #include "gdbsupport/gdb-sigmask.h"
53 #include "gdbsupport/scoped_restore.h"
55 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
56 then ELFMAG0 will have been defined. If it didn't get included by
57 gdb_proc_service.h then including it will likely introduce a duplicate
58 definition of elf_fpregset_t. */
61 #include "nat/linux-namespaces.h"
63 #ifdef HAVE_PERSONALITY
64 # include <sys/personality.h>
65 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
66 # define ADDR_NO_RANDOMIZE 0x0040000
78 /* Some targets did not define these ptrace constants from the start,
79 so gdbserver defines them locally here. In the future, these may
80 be removed after they are added to asm/ptrace.h. */
81 #if !(defined(PT_TEXT_ADDR) \
82 || defined(PT_DATA_ADDR) \
83 || defined(PT_TEXT_END_ADDR))
84 #if defined(__mcoldfire__)
85 /* These are still undefined in 3.10 kernels. */
86 #define PT_TEXT_ADDR 49*4
87 #define PT_DATA_ADDR 50*4
88 #define PT_TEXT_END_ADDR 51*4
89 /* BFIN already defines these since at least 2.6.32 kernels. */
91 #define PT_TEXT_ADDR 220
92 #define PT_TEXT_END_ADDR 224
93 #define PT_DATA_ADDR 228
94 /* These are still undefined in 3.10 kernels. */
95 #elif defined(__TMS320C6X__)
96 #define PT_TEXT_ADDR (0x10000*4)
97 #define PT_DATA_ADDR (0x10004*4)
98 #define PT_TEXT_END_ADDR (0x10008*4)
102 #if (defined(__UCLIBC__) \
103 && defined(HAS_NOMMU) \
104 && defined(PT_TEXT_ADDR) \
105 && defined(PT_DATA_ADDR) \
106 && defined(PT_TEXT_END_ADDR))
107 #define SUPPORTS_READ_OFFSETS
110 #ifdef HAVE_LINUX_BTRACE
111 # include "nat/linux-btrace.h"
112 # include "gdbsupport/btrace-common.h"
115 #ifndef HAVE_ELF32_AUXV_T
116 /* Copied from glibc's elf.h. */
119 uint32_t a_type
; /* Entry type */
122 uint32_t a_val
; /* Integer value */
123 /* We use to have pointer elements added here. We cannot do that,
124 though, since it does not work when using 32-bit definitions
125 on 64-bit platforms and vice versa. */
130 #ifndef HAVE_ELF64_AUXV_T
131 /* Copied from glibc's elf.h. */
134 uint64_t a_type
; /* Entry type */
137 uint64_t a_val
; /* Integer value */
138 /* We use to have pointer elements added here. We cannot do that,
139 though, since it does not work when using 32-bit definitions
140 on 64-bit platforms and vice versa. */
145 /* Does the current host support PTRACE_GETREGSET? */
146 int have_ptrace_getregset
= -1;
150 /* See nat/linux-nat.h. */
153 ptid_of_lwp (struct lwp_info
*lwp
)
155 return ptid_of (get_lwp_thread (lwp
));
158 /* See nat/linux-nat.h. */
161 lwp_set_arch_private_info (struct lwp_info
*lwp
,
162 struct arch_lwp_info
*info
)
164 lwp
->arch_private
= info
;
167 /* See nat/linux-nat.h. */
169 struct arch_lwp_info
*
170 lwp_arch_private_info (struct lwp_info
*lwp
)
172 return lwp
->arch_private
;
175 /* See nat/linux-nat.h. */
178 lwp_is_stopped (struct lwp_info
*lwp
)
183 /* See nat/linux-nat.h. */
185 enum target_stop_reason
186 lwp_stop_reason (struct lwp_info
*lwp
)
188 return lwp
->stop_reason
;
191 /* See nat/linux-nat.h. */
194 lwp_is_stepping (struct lwp_info
*lwp
)
196 return lwp
->stepping
;
199 /* A list of all unknown processes which receive stop signals. Some
200 other process will presumably claim each of these as forked
201 children momentarily. */
203 struct simple_pid_list
205 /* The process ID. */
208 /* The status as reported by waitpid. */
212 struct simple_pid_list
*next
;
214 struct simple_pid_list
*stopped_pids
;
216 /* Trivial list manipulation functions to keep track of a list of new
217 stopped processes. */
220 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
222 struct simple_pid_list
*new_pid
= XNEW (struct simple_pid_list
);
225 new_pid
->status
= status
;
226 new_pid
->next
= *listp
;
231 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
233 struct simple_pid_list
**p
;
235 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
236 if ((*p
)->pid
== pid
)
238 struct simple_pid_list
*next
= (*p
)->next
;
240 *statusp
= (*p
)->status
;
248 enum stopping_threads_kind
250 /* Not stopping threads presently. */
251 NOT_STOPPING_THREADS
,
253 /* Stopping threads. */
256 /* Stopping and suspending threads. */
257 STOPPING_AND_SUSPENDING_THREADS
260 /* This is set while stop_all_lwps is in effect. */
261 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
263 /* FIXME make into a target method? */
264 int using_threads
= 1;
266 /* True if we're presently stabilizing threads (moving them out of
268 static int stabilizing_threads
;
270 static void unsuspend_all_lwps (struct lwp_info
*except
);
271 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
272 static int lwp_is_marked_dead (struct lwp_info
*lwp
);
273 static int kill_lwp (unsigned long lwpid
, int signo
);
274 static void enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
);
275 static int linux_low_ptrace_options (int attached
);
276 static int check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
);
278 /* When the event-loop is doing a step-over, this points at the thread
280 ptid_t step_over_bkpt
;
283 linux_process_target::low_supports_breakpoints ()
289 linux_process_target::low_get_pc (regcache
*regcache
)
295 linux_process_target::low_set_pc (regcache
*regcache
, CORE_ADDR newpc
)
297 gdb_assert_not_reached ("linux target op low_set_pc is not implemented");
300 std::vector
<CORE_ADDR
>
301 linux_process_target::low_get_next_pcs (regcache
*regcache
)
303 gdb_assert_not_reached ("linux target op low_get_next_pcs is not "
308 linux_process_target::low_decr_pc_after_break ()
313 /* True if LWP is stopped in its stepping range. */
316 lwp_in_step_range (struct lwp_info
*lwp
)
318 CORE_ADDR pc
= lwp
->stop_pc
;
320 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
323 struct pending_signals
327 struct pending_signals
*prev
;
330 /* The read/write ends of the pipe registered as waitable file in the
332 static int linux_event_pipe
[2] = { -1, -1 };
334 /* True if we're currently in async mode. */
335 #define target_is_async_p() (linux_event_pipe[0] != -1)
337 static void send_sigstop (struct lwp_info
*lwp
);
339 /* Return non-zero if HEADER is a 64-bit ELF file. */
342 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
344 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
345 && header
->e_ident
[EI_MAG1
] == ELFMAG1
346 && header
->e_ident
[EI_MAG2
] == ELFMAG2
347 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
349 *machine
= header
->e_machine
;
350 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
357 /* Return non-zero if FILE is a 64-bit ELF file,
358 zero if the file is not a 64-bit ELF file,
359 and -1 if the file is not accessible or doesn't exist. */
362 elf_64_file_p (const char *file
, unsigned int *machine
)
367 fd
= open (file
, O_RDONLY
);
371 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
378 return elf_64_header_p (&header
, machine
);
381 /* Accepts an integer PID; Returns true if the executable PID is
382 running is a 64-bit ELF file.. */
385 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
389 sprintf (file
, "/proc/%d/exe", pid
);
390 return elf_64_file_p (file
, machine
);
394 linux_process_target::delete_lwp (lwp_info
*lwp
)
396 struct thread_info
*thr
= get_lwp_thread (lwp
);
399 debug_printf ("deleting %ld\n", lwpid_of (thr
));
403 low_delete_thread (lwp
->arch_private
);
409 linux_process_target::low_delete_thread (arch_lwp_info
*info
)
411 /* Default implementation should be overridden if architecture-specific
412 info is being used. */
413 gdb_assert (info
== nullptr);
417 linux_process_target::add_linux_process (int pid
, int attached
)
419 struct process_info
*proc
;
421 proc
= add_process (pid
, attached
);
422 proc
->priv
= XCNEW (struct process_info_private
);
424 proc
->priv
->arch_private
= low_new_process ();
430 linux_process_target::low_new_process ()
436 linux_process_target::low_delete_process (arch_process_info
*info
)
438 /* Default implementation must be overridden if architecture-specific
440 gdb_assert (info
== nullptr);
444 linux_process_target::low_new_fork (process_info
*parent
, process_info
*child
)
450 linux_process_target::arch_setup_thread (thread_info
*thread
)
452 struct thread_info
*saved_thread
;
454 saved_thread
= current_thread
;
455 current_thread
= thread
;
459 current_thread
= saved_thread
;
463 linux_process_target::handle_extended_wait (lwp_info
**orig_event_lwp
,
466 client_state
&cs
= get_client_state ();
467 struct lwp_info
*event_lwp
= *orig_event_lwp
;
468 int event
= linux_ptrace_get_extended_event (wstat
);
469 struct thread_info
*event_thr
= get_lwp_thread (event_lwp
);
470 struct lwp_info
*new_lwp
;
472 gdb_assert (event_lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
474 /* All extended events we currently use are mid-syscall. Only
475 PTRACE_EVENT_STOP is delivered more like a signal-stop, but
476 you have to be using PTRACE_SEIZE to get that. */
477 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
479 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
480 || (event
== PTRACE_EVENT_CLONE
))
483 unsigned long new_pid
;
486 /* Get the pid of the new lwp. */
487 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
490 /* If we haven't already seen the new PID stop, wait for it now. */
491 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
493 /* The new child has a pending SIGSTOP. We can't affect it until it
494 hits the SIGSTOP, but we're already attached. */
496 ret
= my_waitpid (new_pid
, &status
, __WALL
);
499 perror_with_name ("waiting for new child");
500 else if (ret
!= new_pid
)
501 warning ("wait returned unexpected PID %d", ret
);
502 else if (!WIFSTOPPED (status
))
503 warning ("wait returned unexpected status 0x%x", status
);
506 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
508 struct process_info
*parent_proc
;
509 struct process_info
*child_proc
;
510 struct lwp_info
*child_lwp
;
511 struct thread_info
*child_thr
;
512 struct target_desc
*tdesc
;
514 ptid
= ptid_t (new_pid
, new_pid
, 0);
518 debug_printf ("HEW: Got fork event from LWP %ld, "
520 ptid_of (event_thr
).lwp (),
524 /* Add the new process to the tables and clone the breakpoint
525 lists of the parent. We need to do this even if the new process
526 will be detached, since we will need the process object and the
527 breakpoints to remove any breakpoints from memory when we
528 detach, and the client side will access registers. */
529 child_proc
= add_linux_process (new_pid
, 0);
530 gdb_assert (child_proc
!= NULL
);
531 child_lwp
= add_lwp (ptid
);
532 gdb_assert (child_lwp
!= NULL
);
533 child_lwp
->stopped
= 1;
534 child_lwp
->must_set_ptrace_flags
= 1;
535 child_lwp
->status_pending_p
= 0;
536 child_thr
= get_lwp_thread (child_lwp
);
537 child_thr
->last_resume_kind
= resume_stop
;
538 child_thr
->last_status
.kind
= TARGET_WAITKIND_STOPPED
;
540 /* If we're suspending all threads, leave this one suspended
541 too. If the fork/clone parent is stepping over a breakpoint,
542 all other threads have been suspended already. Leave the
543 child suspended too. */
544 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
545 || event_lwp
->bp_reinsert
!= 0)
548 debug_printf ("HEW: leaving child suspended\n");
549 child_lwp
->suspended
= 1;
552 parent_proc
= get_thread_process (event_thr
);
553 child_proc
->attached
= parent_proc
->attached
;
555 if (event_lwp
->bp_reinsert
!= 0
556 && supports_software_single_step ()
557 && event
== PTRACE_EVENT_VFORK
)
559 /* If we leave single-step breakpoints there, child will
560 hit it, so uninsert single-step breakpoints from parent
561 (and child). Once vfork child is done, reinsert
562 them back to parent. */
563 uninsert_single_step_breakpoints (event_thr
);
566 clone_all_breakpoints (child_thr
, event_thr
);
568 tdesc
= allocate_target_description ();
569 copy_target_description (tdesc
, parent_proc
->tdesc
);
570 child_proc
->tdesc
= tdesc
;
572 /* Clone arch-specific process data. */
573 low_new_fork (parent_proc
, child_proc
);
575 /* Save fork info in the parent thread. */
576 if (event
== PTRACE_EVENT_FORK
)
577 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
578 else if (event
== PTRACE_EVENT_VFORK
)
579 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
581 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
583 /* The status_pending field contains bits denoting the
584 extended event, so when the pending event is handled,
585 the handler will look at lwp->waitstatus. */
586 event_lwp
->status_pending_p
= 1;
587 event_lwp
->status_pending
= wstat
;
589 /* Link the threads until the parent event is passed on to
591 event_lwp
->fork_relative
= child_lwp
;
592 child_lwp
->fork_relative
= event_lwp
;
594 /* If the parent thread is doing step-over with single-step
595 breakpoints, the list of single-step breakpoints are cloned
596 from the parent's. Remove them from the child process.
597 In case of vfork, we'll reinsert them back once vforked
599 if (event_lwp
->bp_reinsert
!= 0
600 && supports_software_single_step ())
602 /* The child process is forked and stopped, so it is safe
603 to access its memory without stopping all other threads
604 from other processes. */
605 delete_single_step_breakpoints (child_thr
);
607 gdb_assert (has_single_step_breakpoints (event_thr
));
608 gdb_assert (!has_single_step_breakpoints (child_thr
));
611 /* Report the event. */
616 debug_printf ("HEW: Got clone event "
617 "from LWP %ld, new child is LWP %ld\n",
618 lwpid_of (event_thr
), new_pid
);
620 ptid
= ptid_t (pid_of (event_thr
), new_pid
, 0);
621 new_lwp
= add_lwp (ptid
);
623 /* Either we're going to immediately resume the new thread
624 or leave it stopped. resume_one_lwp is a nop if it
625 thinks the thread is currently running, so set this first
626 before calling resume_one_lwp. */
627 new_lwp
->stopped
= 1;
629 /* If we're suspending all threads, leave this one suspended
630 too. If the fork/clone parent is stepping over a breakpoint,
631 all other threads have been suspended already. Leave the
632 child suspended too. */
633 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
634 || event_lwp
->bp_reinsert
!= 0)
635 new_lwp
->suspended
= 1;
637 /* Normally we will get the pending SIGSTOP. But in some cases
638 we might get another signal delivered to the group first.
639 If we do get another signal, be sure not to lose it. */
640 if (WSTOPSIG (status
) != SIGSTOP
)
642 new_lwp
->stop_expected
= 1;
643 new_lwp
->status_pending_p
= 1;
644 new_lwp
->status_pending
= status
;
646 else if (cs
.report_thread_events
)
648 new_lwp
->waitstatus
.kind
= TARGET_WAITKIND_THREAD_CREATED
;
649 new_lwp
->status_pending_p
= 1;
650 new_lwp
->status_pending
= status
;
654 thread_db_notice_clone (event_thr
, ptid
);
657 /* Don't report the event. */
660 else if (event
== PTRACE_EVENT_VFORK_DONE
)
662 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
664 if (event_lwp
->bp_reinsert
!= 0 && supports_software_single_step ())
666 reinsert_single_step_breakpoints (event_thr
);
668 gdb_assert (has_single_step_breakpoints (event_thr
));
671 /* Report the event. */
674 else if (event
== PTRACE_EVENT_EXEC
&& cs
.report_exec_events
)
676 struct process_info
*proc
;
677 std::vector
<int> syscalls_to_catch
;
683 debug_printf ("HEW: Got exec event from LWP %ld\n",
684 lwpid_of (event_thr
));
687 /* Get the event ptid. */
688 event_ptid
= ptid_of (event_thr
);
689 event_pid
= event_ptid
.pid ();
691 /* Save the syscall list from the execing process. */
692 proc
= get_thread_process (event_thr
);
693 syscalls_to_catch
= std::move (proc
->syscalls_to_catch
);
695 /* Delete the execing process and all its threads. */
697 current_thread
= NULL
;
699 /* Create a new process/lwp/thread. */
700 proc
= add_linux_process (event_pid
, 0);
701 event_lwp
= add_lwp (event_ptid
);
702 event_thr
= get_lwp_thread (event_lwp
);
703 gdb_assert (current_thread
== event_thr
);
704 arch_setup_thread (event_thr
);
706 /* Set the event status. */
707 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
708 event_lwp
->waitstatus
.value
.execd_pathname
709 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
711 /* Mark the exec status as pending. */
712 event_lwp
->stopped
= 1;
713 event_lwp
->status_pending_p
= 1;
714 event_lwp
->status_pending
= wstat
;
715 event_thr
->last_resume_kind
= resume_continue
;
716 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
718 /* Update syscall state in the new lwp, effectively mid-syscall too. */
719 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
721 /* Restore the list to catch. Don't rely on the client, which is free
722 to avoid sending a new list when the architecture doesn't change.
723 Also, for ANY_SYSCALL, the architecture doesn't really matter. */
724 proc
->syscalls_to_catch
= std::move (syscalls_to_catch
);
726 /* Report the event. */
727 *orig_event_lwp
= event_lwp
;
731 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
735 linux_process_target::get_pc (lwp_info
*lwp
)
737 struct thread_info
*saved_thread
;
738 struct regcache
*regcache
;
741 if (!low_supports_breakpoints ())
744 saved_thread
= current_thread
;
745 current_thread
= get_lwp_thread (lwp
);
747 regcache
= get_thread_regcache (current_thread
, 1);
748 pc
= low_get_pc (regcache
);
751 debug_printf ("pc is 0x%lx\n", (long) pc
);
753 current_thread
= saved_thread
;
757 /* This function should only be called if LWP got a SYSCALL_SIGTRAP.
758 Fill *SYSNO with the syscall nr trapped. */
761 get_syscall_trapinfo (struct lwp_info
*lwp
, int *sysno
)
763 struct thread_info
*saved_thread
;
764 struct regcache
*regcache
;
766 if (the_low_target
.get_syscall_trapinfo
== NULL
)
768 /* If we cannot get the syscall trapinfo, report an unknown
769 system call number. */
770 *sysno
= UNKNOWN_SYSCALL
;
774 saved_thread
= current_thread
;
775 current_thread
= get_lwp_thread (lwp
);
777 regcache
= get_thread_regcache (current_thread
, 1);
778 (*the_low_target
.get_syscall_trapinfo
) (regcache
, sysno
);
781 debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno
);
783 current_thread
= saved_thread
;
787 linux_process_target::save_stop_reason (lwp_info
*lwp
)
790 CORE_ADDR sw_breakpoint_pc
;
791 struct thread_info
*saved_thread
;
792 #if USE_SIGTRAP_SIGINFO
796 if (!low_supports_breakpoints ())
800 sw_breakpoint_pc
= pc
- low_decr_pc_after_break ();
802 /* breakpoint_at reads from the current thread. */
803 saved_thread
= current_thread
;
804 current_thread
= get_lwp_thread (lwp
);
806 #if USE_SIGTRAP_SIGINFO
807 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
808 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
810 if (siginfo
.si_signo
== SIGTRAP
)
812 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
)
813 && GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
815 /* The si_code is ambiguous on this arch -- check debug
817 if (!check_stopped_by_watchpoint (lwp
))
818 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
820 else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
822 /* If we determine the LWP stopped for a SW breakpoint,
823 trust it. Particularly don't check watchpoint
824 registers, because at least on s390, we'd find
825 stopped-by-watchpoint as long as there's a watchpoint
827 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
829 else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
831 /* This can indicate either a hardware breakpoint or
832 hardware watchpoint. Check debug registers. */
833 if (!check_stopped_by_watchpoint (lwp
))
834 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
836 else if (siginfo
.si_code
== TRAP_TRACE
)
838 /* We may have single stepped an instruction that
839 triggered a watchpoint. In that case, on some
840 architectures (such as x86), instead of TRAP_HWBKPT,
841 si_code indicates TRAP_TRACE, and we need to check
842 the debug registers separately. */
843 if (!check_stopped_by_watchpoint (lwp
))
844 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
849 /* We may have just stepped a breakpoint instruction. E.g., in
850 non-stop mode, GDB first tells the thread A to step a range, and
851 then the user inserts a breakpoint inside the range. In that
852 case we need to report the breakpoint PC. */
853 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
854 && low_breakpoint_at (sw_breakpoint_pc
))
855 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
857 if (hardware_breakpoint_inserted_here (pc
))
858 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
860 if (lwp
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
)
861 check_stopped_by_watchpoint (lwp
);
864 if (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
868 struct thread_info
*thr
= get_lwp_thread (lwp
);
870 debug_printf ("CSBB: %s stopped by software breakpoint\n",
871 target_pid_to_str (ptid_of (thr
)));
874 /* Back up the PC if necessary. */
875 if (pc
!= sw_breakpoint_pc
)
877 struct regcache
*regcache
878 = get_thread_regcache (current_thread
, 1);
879 low_set_pc (regcache
, sw_breakpoint_pc
);
882 /* Update this so we record the correct stop PC below. */
883 pc
= sw_breakpoint_pc
;
885 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
)
889 struct thread_info
*thr
= get_lwp_thread (lwp
);
891 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
892 target_pid_to_str (ptid_of (thr
)));
895 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
899 struct thread_info
*thr
= get_lwp_thread (lwp
);
901 debug_printf ("CSBB: %s stopped by hardware watchpoint\n",
902 target_pid_to_str (ptid_of (thr
)));
905 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
)
909 struct thread_info
*thr
= get_lwp_thread (lwp
);
911 debug_printf ("CSBB: %s stopped by trace\n",
912 target_pid_to_str (ptid_of (thr
)));
917 current_thread
= saved_thread
;
922 linux_process_target::add_lwp (ptid_t ptid
)
924 struct lwp_info
*lwp
;
926 lwp
= XCNEW (struct lwp_info
);
928 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
930 lwp
->thread
= add_thread (ptid
, lwp
);
932 low_new_thread (lwp
);
938 linux_process_target::low_new_thread (lwp_info
*info
)
943 /* Callback to be used when calling fork_inferior, responsible for
944 actually initiating the tracing of the inferior. */
949 if (ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0,
950 (PTRACE_TYPE_ARG4
) 0) < 0)
951 trace_start_error_with_name ("ptrace");
953 if (setpgid (0, 0) < 0)
954 trace_start_error_with_name ("setpgid");
956 /* If GDBserver is connected to gdb via stdio, redirect the inferior's
957 stdout to stderr so that inferior i/o doesn't corrupt the connection.
958 Also, redirect stdin to /dev/null. */
959 if (remote_connection_is_stdio ())
962 trace_start_error_with_name ("close");
963 if (open ("/dev/null", O_RDONLY
) < 0)
964 trace_start_error_with_name ("open");
966 trace_start_error_with_name ("dup2");
967 if (write (2, "stdin/stdout redirected\n",
968 sizeof ("stdin/stdout redirected\n") - 1) < 0)
970 /* Errors ignored. */;
975 /* Start an inferior process and returns its pid.
976 PROGRAM is the name of the program to be started, and PROGRAM_ARGS
977 are its arguments. */
980 linux_process_target::create_inferior (const char *program
,
981 const std::vector
<char *> &program_args
)
983 client_state
&cs
= get_client_state ();
984 struct lwp_info
*new_lwp
;
989 maybe_disable_address_space_randomization restore_personality
990 (cs
.disable_randomization
);
991 std::string str_program_args
= stringify_argv (program_args
);
993 pid
= fork_inferior (program
,
994 str_program_args
.c_str (),
995 get_environ ()->envp (), linux_ptrace_fun
,
996 NULL
, NULL
, NULL
, NULL
);
999 add_linux_process (pid
, 0);
1001 ptid
= ptid_t (pid
, pid
, 0);
1002 new_lwp
= add_lwp (ptid
);
1003 new_lwp
->must_set_ptrace_flags
= 1;
1005 post_fork_inferior (pid
, program
);
1010 /* Implement the post_create_inferior target_ops method. */
1013 linux_process_target::post_create_inferior ()
1015 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
1019 if (lwp
->must_set_ptrace_flags
)
1021 struct process_info
*proc
= current_process ();
1022 int options
= linux_low_ptrace_options (proc
->attached
);
1024 linux_enable_event_reporting (lwpid_of (current_thread
), options
);
1025 lwp
->must_set_ptrace_flags
= 0;
1030 linux_process_target::attach_lwp (ptid_t ptid
)
1032 struct lwp_info
*new_lwp
;
1033 int lwpid
= ptid
.lwp ();
1035 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
1039 new_lwp
= add_lwp (ptid
);
1041 /* We need to wait for SIGSTOP before being able to make the next
1042 ptrace call on this LWP. */
1043 new_lwp
->must_set_ptrace_flags
= 1;
1045 if (linux_proc_pid_is_stopped (lwpid
))
1048 debug_printf ("Attached to a stopped process\n");
1050 /* The process is definitely stopped. It is in a job control
1051 stop, unless the kernel predates the TASK_STOPPED /
1052 TASK_TRACED distinction, in which case it might be in a
1053 ptrace stop. Make sure it is in a ptrace stop; from there we
1054 can kill it, signal it, et cetera.
1056 First make sure there is a pending SIGSTOP. Since we are
1057 already attached, the process can not transition from stopped
1058 to running without a PTRACE_CONT; so we know this signal will
1059 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1060 probably already in the queue (unless this kernel is old
1061 enough to use TASK_STOPPED for ptrace stops); but since
1062 SIGSTOP is not an RT signal, it can only be queued once. */
1063 kill_lwp (lwpid
, SIGSTOP
);
1065 /* Finally, resume the stopped process. This will deliver the
1066 SIGSTOP (or a higher priority signal, just like normal
1067 PTRACE_ATTACH), which we'll catch later on. */
1068 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1071 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
1072 brings it to a halt.
1074 There are several cases to consider here:
1076 1) gdbserver has already attached to the process and is being notified
1077 of a new thread that is being created.
1078 In this case we should ignore that SIGSTOP and resume the
1079 process. This is handled below by setting stop_expected = 1,
1080 and the fact that add_thread sets last_resume_kind ==
1083 2) This is the first thread (the process thread), and we're attaching
1084 to it via attach_inferior.
1085 In this case we want the process thread to stop.
1086 This is handled by having linux_attach set last_resume_kind ==
1087 resume_stop after we return.
1089 If the pid we are attaching to is also the tgid, we attach to and
1090 stop all the existing threads. Otherwise, we attach to pid and
1091 ignore any other threads in the same group as this pid.
1093 3) GDB is connecting to gdbserver and is requesting an enumeration of all
1095 In this case we want the thread to stop.
1096 FIXME: This case is currently not properly handled.
1097 We should wait for the SIGSTOP but don't. Things work apparently
1098 because enough time passes between when we ptrace (ATTACH) and when
1099 gdb makes the next ptrace call on the thread.
1101 On the other hand, if we are currently trying to stop all threads, we
1102 should treat the new thread as if we had sent it a SIGSTOP. This works
1103 because we are guaranteed that the add_lwp call above added us to the
1104 end of the list, and so the new thread has not yet reached
1105 wait_for_sigstop (but will). */
1106 new_lwp
->stop_expected
= 1;
1111 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
1112 already attached. Returns true if a new LWP is found, false
1116 attach_proc_task_lwp_callback (ptid_t ptid
)
1118 /* Is this a new thread? */
1119 if (find_thread_ptid (ptid
) == NULL
)
1121 int lwpid
= ptid
.lwp ();
1125 debug_printf ("Found new lwp %d\n", lwpid
);
1127 err
= the_linux_target
->attach_lwp (ptid
);
1129 /* Be quiet if we simply raced with the thread exiting. EPERM
1130 is returned if the thread's task still exists, and is marked
1131 as exited or zombie, as well as other conditions, so in that
1132 case, confirm the status in /proc/PID/status. */
1134 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1138 debug_printf ("Cannot attach to lwp %d: "
1139 "thread is gone (%d: %s)\n",
1140 lwpid
, err
, safe_strerror (err
));
1146 = linux_ptrace_attach_fail_reason_string (ptid
, err
);
1148 warning (_("Cannot attach to lwp %d: %s"), lwpid
, reason
.c_str ());
1156 static void async_file_mark (void);
1158 /* Attach to PID. If PID is the tgid, attach to it and all
1162 linux_process_target::attach (unsigned long pid
)
1164 struct process_info
*proc
;
1165 struct thread_info
*initial_thread
;
1166 ptid_t ptid
= ptid_t (pid
, pid
, 0);
1169 proc
= add_linux_process (pid
, 1);
1171 /* Attach to PID. We will check for other threads
1173 err
= attach_lwp (ptid
);
1176 remove_process (proc
);
1178 std::string reason
= linux_ptrace_attach_fail_reason_string (ptid
, err
);
1179 error ("Cannot attach to process %ld: %s", pid
, reason
.c_str ());
1182 /* Don't ignore the initial SIGSTOP if we just attached to this
1183 process. It will be collected by wait shortly. */
1184 initial_thread
= find_thread_ptid (ptid_t (pid
, pid
, 0));
1185 initial_thread
->last_resume_kind
= resume_stop
;
1187 /* We must attach to every LWP. If /proc is mounted, use that to
1188 find them now. On the one hand, the inferior may be using raw
1189 clone instead of using pthreads. On the other hand, even if it
1190 is using pthreads, GDB may not be connected yet (thread_db needs
1191 to do symbol lookups, through qSymbol). Also, thread_db walks
1192 structures in the inferior's address space to find the list of
1193 threads/LWPs, and those structures may well be corrupted. Note
1194 that once thread_db is loaded, we'll still use it to list threads
1195 and associate pthread info with each LWP. */
1196 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1198 /* GDB will shortly read the xml target description for this
1199 process, to figure out the process' architecture. But the target
1200 description is only filled in when the first process/thread in
1201 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1202 that now, otherwise, if GDB is fast enough, it could read the
1203 target description _before_ that initial stop. */
1206 struct lwp_info
*lwp
;
1208 ptid_t pid_ptid
= ptid_t (pid
);
1210 lwpid
= wait_for_event_filtered (pid_ptid
, pid_ptid
, &wstat
, __WALL
);
1211 gdb_assert (lwpid
> 0);
1213 lwp
= find_lwp_pid (ptid_t (lwpid
));
1215 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGSTOP
)
1217 lwp
->status_pending_p
= 1;
1218 lwp
->status_pending
= wstat
;
1221 initial_thread
->last_resume_kind
= resume_continue
;
1225 gdb_assert (proc
->tdesc
!= NULL
);
1232 last_thread_of_process_p (int pid
)
1234 bool seen_one
= false;
1236 thread_info
*thread
= find_thread (pid
, [&] (thread_info
*thr_arg
)
1240 /* This is the first thread of this process we see. */
1246 /* This is the second thread of this process we see. */
1251 return thread
== NULL
;
1257 linux_kill_one_lwp (struct lwp_info
*lwp
)
1259 struct thread_info
*thr
= get_lwp_thread (lwp
);
1260 int pid
= lwpid_of (thr
);
1262 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1263 there is no signal context, and ptrace(PTRACE_KILL) (or
1264 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1265 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1266 alternative is to kill with SIGKILL. We only need one SIGKILL
1267 per process, not one for each thread. But since we still support
1268 support debugging programs using raw clone without CLONE_THREAD,
1269 we send one for each thread. For years, we used PTRACE_KILL
1270 only, so we're being a bit paranoid about some old kernels where
1271 PTRACE_KILL might work better (dubious if there are any such, but
1272 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1273 second, and so we're fine everywhere. */
1276 kill_lwp (pid
, SIGKILL
);
1279 int save_errno
= errno
;
1281 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1282 target_pid_to_str (ptid_of (thr
)),
1283 save_errno
? safe_strerror (save_errno
) : "OK");
1287 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1290 int save_errno
= errno
;
1292 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1293 target_pid_to_str (ptid_of (thr
)),
1294 save_errno
? safe_strerror (save_errno
) : "OK");
1298 /* Kill LWP and wait for it to die. */
1301 kill_wait_lwp (struct lwp_info
*lwp
)
1303 struct thread_info
*thr
= get_lwp_thread (lwp
);
1304 int pid
= ptid_of (thr
).pid ();
1305 int lwpid
= ptid_of (thr
).lwp ();
1310 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1314 linux_kill_one_lwp (lwp
);
1316 /* Make sure it died. Notes:
1318 - The loop is most likely unnecessary.
1320 - We don't use wait_for_event as that could delete lwps
1321 while we're iterating over them. We're not interested in
1322 any pending status at this point, only in making sure all
1323 wait status on the kernel side are collected until the
1326 - We don't use __WALL here as the __WALL emulation relies on
1327 SIGCHLD, and killing a stopped process doesn't generate
1328 one, nor an exit status.
1330 res
= my_waitpid (lwpid
, &wstat
, 0);
1331 if (res
== -1 && errno
== ECHILD
)
1332 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1333 } while (res
> 0 && WIFSTOPPED (wstat
));
1335 /* Even if it was stopped, the child may have already disappeared.
1336 E.g., if it was killed by SIGKILL. */
1337 if (res
< 0 && errno
!= ECHILD
)
1338 perror_with_name ("kill_wait_lwp");
1341 /* Callback for `for_each_thread'. Kills an lwp of a given process,
1342 except the leader. */
1345 kill_one_lwp_callback (thread_info
*thread
, int pid
)
1347 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1349 /* We avoid killing the first thread here, because of a Linux kernel (at
1350 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1351 the children get a chance to be reaped, it will remain a zombie
1354 if (lwpid_of (thread
) == pid
)
1357 debug_printf ("lkop: is last of process %s\n",
1358 target_pid_to_str (thread
->id
));
1362 kill_wait_lwp (lwp
);
1366 linux_process_target::kill (process_info
*process
)
1368 int pid
= process
->pid
;
1370 /* If we're killing a running inferior, make sure it is stopped
1371 first, as PTRACE_KILL will not work otherwise. */
1372 stop_all_lwps (0, NULL
);
1374 for_each_thread (pid
, [&] (thread_info
*thread
)
1376 kill_one_lwp_callback (thread
, pid
);
1379 /* See the comment in linux_kill_one_lwp. We did not kill the first
1380 thread in the list, so do so now. */
1381 lwp_info
*lwp
= find_lwp_pid (ptid_t (pid
));
1386 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1390 kill_wait_lwp (lwp
);
1394 /* Since we presently can only stop all lwps of all processes, we
1395 need to unstop lwps of other processes. */
1396 unstop_all_lwps (0, NULL
);
1400 /* Get pending signal of THREAD, for detaching purposes. This is the
1401 signal the thread last stopped for, which we need to deliver to the
1402 thread when detaching, otherwise, it'd be suppressed/lost. */
1405 get_detach_signal (struct thread_info
*thread
)
1407 client_state
&cs
= get_client_state ();
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 (cs
.program_signals_p
&& !cs
.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 (!cs
.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
);
1482 linux_process_target::detach_one_lwp (lwp_info
*lwp
)
1484 struct thread_info
*thread
= get_lwp_thread (lwp
);
1488 /* If there is a pending SIGSTOP, get rid of it. */
1489 if (lwp
->stop_expected
)
1492 debug_printf ("Sending SIGCONT to %s\n",
1493 target_pid_to_str (ptid_of (thread
)));
1495 kill_lwp (lwpid_of (thread
), SIGCONT
);
1496 lwp
->stop_expected
= 0;
1499 /* Pass on any pending signal for this thread. */
1500 sig
= get_detach_signal (thread
);
1502 /* Preparing to resume may try to write registers, and fail if the
1503 lwp is zombie. If that happens, ignore the error. We'll handle
1504 it below, when detach fails with ESRCH. */
1507 /* Flush any pending changes to the process's registers. */
1508 regcache_invalidate_thread (thread
);
1510 /* Finally, let it resume. */
1511 low_prepare_to_resume (lwp
);
1513 catch (const gdb_exception_error
&ex
)
1515 if (!check_ptrace_stopped_lwp_gone (lwp
))
1519 lwpid
= lwpid_of (thread
);
1520 if (ptrace (PTRACE_DETACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0,
1521 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1523 int save_errno
= errno
;
1525 /* We know the thread exists, so ESRCH must mean the lwp is
1526 zombie. This can happen if one of the already-detached
1527 threads exits the whole thread group. In that case we're
1528 still attached, and must reap the lwp. */
1529 if (save_errno
== ESRCH
)
1533 ret
= my_waitpid (lwpid
, &status
, __WALL
);
1536 warning (_("Couldn't reap LWP %d while detaching: %s"),
1537 lwpid
, safe_strerror (errno
));
1539 else if (!WIFEXITED (status
) && !WIFSIGNALED (status
))
1541 warning (_("Reaping LWP %d while detaching "
1542 "returned unexpected status 0x%x"),
1548 error (_("Can't detach %s: %s"),
1549 target_pid_to_str (ptid_of (thread
)),
1550 safe_strerror (save_errno
));
1553 else if (debug_threads
)
1555 debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n",
1556 target_pid_to_str (ptid_of (thread
)),
1564 linux_process_target::detach (process_info
*process
)
1566 struct lwp_info
*main_lwp
;
1568 /* As there's a step over already in progress, let it finish first,
1569 otherwise nesting a stabilize_threads operation on top gets real
1571 complete_ongoing_step_over ();
1573 /* Stop all threads before detaching. First, ptrace requires that
1574 the thread is stopped to successfully detach. Second, thread_db
1575 may need to uninstall thread event breakpoints from memory, which
1576 only works with a stopped process anyway. */
1577 stop_all_lwps (0, NULL
);
1579 #ifdef USE_THREAD_DB
1580 thread_db_detach (process
);
1583 /* Stabilize threads (move out of jump pads). */
1584 target_stabilize_threads ();
1586 /* Detach from the clone lwps first. If the thread group exits just
1587 while we're detaching, we must reap the clone lwps before we're
1588 able to reap the leader. */
1589 for_each_thread (process
->pid
, [this] (thread_info
*thread
)
1591 /* We don't actually detach from the thread group leader just yet.
1592 If the thread group exits, we must reap the zombie clone lwps
1593 before we're able to reap the leader. */
1594 if (thread
->id
.pid () == thread
->id
.lwp ())
1597 lwp_info
*lwp
= get_thread_lwp (thread
);
1598 detach_one_lwp (lwp
);
1601 main_lwp
= find_lwp_pid (ptid_t (process
->pid
));
1602 detach_one_lwp (main_lwp
);
1606 /* Since we presently can only stop all lwps of all processes, we
1607 need to unstop lwps of other processes. */
1608 unstop_all_lwps (0, NULL
);
1612 /* Remove all LWPs that belong to process PROC from the lwp list. */
1615 linux_process_target::mourn (process_info
*process
)
1617 struct process_info_private
*priv
;
1619 #ifdef USE_THREAD_DB
1620 thread_db_mourn (process
);
1623 for_each_thread (process
->pid
, [this] (thread_info
*thread
)
1625 delete_lwp (get_thread_lwp (thread
));
1628 /* Freeing all private data. */
1629 priv
= process
->priv
;
1630 low_delete_process (priv
->arch_private
);
1632 process
->priv
= NULL
;
1634 remove_process (process
);
1638 linux_process_target::join (int pid
)
1643 ret
= my_waitpid (pid
, &status
, 0);
1644 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1646 } while (ret
!= -1 || errno
!= ECHILD
);
1649 /* Return true if the given thread is still alive. */
1652 linux_process_target::thread_alive (ptid_t ptid
)
1654 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1656 /* We assume we always know if a thread exits. If a whole process
1657 exited but we still haven't been able to report it to GDB, we'll
1658 hold on to the last lwp of the dead process. */
1660 return !lwp_is_marked_dead (lwp
);
1666 linux_process_target::thread_still_has_status_pending (thread_info
*thread
)
1668 struct lwp_info
*lp
= get_thread_lwp (thread
);
1670 if (!lp
->status_pending_p
)
1673 if (thread
->last_resume_kind
!= resume_stop
1674 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1675 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1677 struct thread_info
*saved_thread
;
1681 gdb_assert (lp
->last_status
!= 0);
1685 saved_thread
= current_thread
;
1686 current_thread
= thread
;
1688 if (pc
!= lp
->stop_pc
)
1691 debug_printf ("PC of %ld changed\n",
1696 #if !USE_SIGTRAP_SIGINFO
1697 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1698 && !low_breakpoint_at (pc
))
1701 debug_printf ("previous SW breakpoint of %ld gone\n",
1705 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1706 && !hardware_breakpoint_inserted_here (pc
))
1709 debug_printf ("previous HW breakpoint of %ld gone\n",
1715 current_thread
= saved_thread
;
1720 debug_printf ("discarding pending breakpoint status\n");
1721 lp
->status_pending_p
= 0;
1729 /* Returns true if LWP is resumed from the client's perspective. */
1732 lwp_resumed (struct lwp_info
*lwp
)
1734 struct thread_info
*thread
= get_lwp_thread (lwp
);
1736 if (thread
->last_resume_kind
!= resume_stop
)
1739 /* Did gdb send us a `vCont;t', but we haven't reported the
1740 corresponding stop to gdb yet? If so, the thread is still
1741 resumed/running from gdb's perspective. */
1742 if (thread
->last_resume_kind
== resume_stop
1743 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1750 linux_process_target::status_pending_p_callback (thread_info
*thread
,
1753 struct lwp_info
*lp
= get_thread_lwp (thread
);
1755 /* Check if we're only interested in events from a specific process
1756 or a specific LWP. */
1757 if (!thread
->id
.matches (ptid
))
1760 if (!lwp_resumed (lp
))
1763 if (lp
->status_pending_p
1764 && !thread_still_has_status_pending (thread
))
1766 resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1770 return lp
->status_pending_p
;
1774 find_lwp_pid (ptid_t ptid
)
1776 thread_info
*thread
= find_thread ([&] (thread_info
*thr_arg
)
1778 int lwp
= ptid
.lwp () != 0 ? ptid
.lwp () : ptid
.pid ();
1779 return thr_arg
->id
.lwp () == lwp
;
1785 return get_thread_lwp (thread
);
1788 /* Return the number of known LWPs in the tgid given by PID. */
1795 for_each_thread (pid
, [&] (thread_info
*thread
)
1803 /* See nat/linux-nat.h. */
1806 iterate_over_lwps (ptid_t filter
,
1807 gdb::function_view
<iterate_over_lwps_ftype
> callback
)
1809 thread_info
*thread
= find_thread (filter
, [&] (thread_info
*thr_arg
)
1811 lwp_info
*lwp
= get_thread_lwp (thr_arg
);
1813 return callback (lwp
);
1819 return get_thread_lwp (thread
);
1823 linux_process_target::check_zombie_leaders ()
1825 for_each_process ([this] (process_info
*proc
) {
1826 pid_t leader_pid
= pid_of (proc
);
1827 struct lwp_info
*leader_lp
;
1829 leader_lp
= find_lwp_pid (ptid_t (leader_pid
));
1832 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1833 "num_lwps=%d, zombie=%d\n",
1834 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1835 linux_proc_pid_is_zombie (leader_pid
));
1837 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1838 /* Check if there are other threads in the group, as we may
1839 have raced with the inferior simply exiting. */
1840 && !last_thread_of_process_p (leader_pid
)
1841 && linux_proc_pid_is_zombie (leader_pid
))
1843 /* A leader zombie can mean one of two things:
1845 - It exited, and there's an exit status pending
1846 available, or only the leader exited (not the whole
1847 program). In the latter case, we can't waitpid the
1848 leader's exit status until all other threads are gone.
1850 - There are 3 or more threads in the group, and a thread
1851 other than the leader exec'd. On an exec, the Linux
1852 kernel destroys all other threads (except the execing
1853 one) in the thread group, and resets the execing thread's
1854 tid to the tgid. No exit notification is sent for the
1855 execing thread -- from the ptracer's perspective, it
1856 appears as though the execing thread just vanishes.
1857 Until we reap all other threads except the leader and the
1858 execing thread, the leader will be zombie, and the
1859 execing thread will be in `D (disc sleep)'. As soon as
1860 all other threads are reaped, the execing thread changes
1861 it's tid to the tgid, and the previous (zombie) leader
1862 vanishes, giving place to the "new" leader. We could try
1863 distinguishing the exit and exec cases, by waiting once
1864 more, and seeing if something comes out, but it doesn't
1865 sound useful. The previous leader _does_ go away, and
1866 we'll re-add the new one once we see the exec event
1867 (which is just the same as what would happen if the
1868 previous leader did exit voluntarily before some other
1872 debug_printf ("CZL: Thread group leader %d zombie "
1873 "(it exited, or another thread execd).\n",
1876 delete_lwp (leader_lp
);
1881 /* Callback for `find_thread'. Returns the first LWP that is not
1885 not_stopped_callback (thread_info
*thread
, ptid_t filter
)
1887 if (!thread
->id
.matches (filter
))
1890 lwp_info
*lwp
= get_thread_lwp (thread
);
1892 return !lwp
->stopped
;
1895 /* Increment LWP's suspend count. */
1898 lwp_suspended_inc (struct lwp_info
*lwp
)
1902 if (debug_threads
&& lwp
->suspended
> 4)
1904 struct thread_info
*thread
= get_lwp_thread (lwp
);
1906 debug_printf ("LWP %ld has a suspiciously high suspend count,"
1907 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
1911 /* Decrement LWP's suspend count. */
1914 lwp_suspended_decr (struct lwp_info
*lwp
)
1918 if (lwp
->suspended
< 0)
1920 struct thread_info
*thread
= get_lwp_thread (lwp
);
1922 internal_error (__FILE__
, __LINE__
,
1923 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
1928 /* This function should only be called if the LWP got a SIGTRAP.
1930 Handle any tracepoint steps or hits. Return true if a tracepoint
1931 event was handled, 0 otherwise. */
1934 handle_tracepoints (struct lwp_info
*lwp
)
1936 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1937 int tpoint_related_event
= 0;
1939 gdb_assert (lwp
->suspended
== 0);
1941 /* If this tracepoint hit causes a tracing stop, we'll immediately
1942 uninsert tracepoints. To do this, we temporarily pause all
1943 threads, unpatch away, and then unpause threads. We need to make
1944 sure the unpausing doesn't resume LWP too. */
1945 lwp_suspended_inc (lwp
);
1947 /* And we need to be sure that any all-threads-stopping doesn't try
1948 to move threads out of the jump pads, as it could deadlock the
1949 inferior (LWP could be in the jump pad, maybe even holding the
1952 /* Do any necessary step collect actions. */
1953 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1955 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1957 /* See if we just hit a tracepoint and do its main collect
1959 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1961 lwp_suspended_decr (lwp
);
1963 gdb_assert (lwp
->suspended
== 0);
1964 gdb_assert (!stabilizing_threads
1965 || (lwp
->collecting_fast_tracepoint
1966 != fast_tpoint_collect_result::not_collecting
));
1968 if (tpoint_related_event
)
1971 debug_printf ("got a tracepoint event\n");
1978 fast_tpoint_collect_result
1979 linux_process_target::linux_fast_tracepoint_collecting
1980 (lwp_info
*lwp
, fast_tpoint_collect_status
*status
)
1982 CORE_ADDR thread_area
;
1983 struct thread_info
*thread
= get_lwp_thread (lwp
);
1985 /* Get the thread area address. This is used to recognize which
1986 thread is which when tracing with the in-process agent library.
1987 We don't read anything from the address, and treat it as opaque;
1988 it's the address itself that we assume is unique per-thread. */
1989 if (low_get_thread_area (lwpid_of (thread
), &thread_area
) == -1)
1990 return fast_tpoint_collect_result::not_collecting
;
1992 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1996 linux_process_target::low_get_thread_area (int lwpid
, CORE_ADDR
*addrp
)
2002 linux_process_target::maybe_move_out_of_jump_pad (lwp_info
*lwp
, int *wstat
)
2004 struct thread_info
*saved_thread
;
2006 saved_thread
= current_thread
;
2007 current_thread
= get_lwp_thread (lwp
);
2010 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2011 && supports_fast_tracepoints ()
2012 && agent_loaded_p ())
2014 struct fast_tpoint_collect_status status
;
2017 debug_printf ("Checking whether LWP %ld needs to move out of the "
2019 lwpid_of (current_thread
));
2021 fast_tpoint_collect_result r
2022 = linux_fast_tracepoint_collecting (lwp
, &status
);
2025 || (WSTOPSIG (*wstat
) != SIGILL
2026 && WSTOPSIG (*wstat
) != SIGFPE
2027 && WSTOPSIG (*wstat
) != SIGSEGV
2028 && WSTOPSIG (*wstat
) != SIGBUS
))
2030 lwp
->collecting_fast_tracepoint
= r
;
2032 if (r
!= fast_tpoint_collect_result::not_collecting
)
2034 if (r
== fast_tpoint_collect_result::before_insn
2035 && lwp
->exit_jump_pad_bkpt
== NULL
)
2037 /* Haven't executed the original instruction yet.
2038 Set breakpoint there, and wait till it's hit,
2039 then single-step until exiting the jump pad. */
2040 lwp
->exit_jump_pad_bkpt
2041 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2045 debug_printf ("Checking whether LWP %ld needs to move out of "
2046 "the jump pad...it does\n",
2047 lwpid_of (current_thread
));
2048 current_thread
= saved_thread
;
2055 /* If we get a synchronous signal while collecting, *and*
2056 while executing the (relocated) original instruction,
2057 reset the PC to point at the tpoint address, before
2058 reporting to GDB. Otherwise, it's an IPA lib bug: just
2059 report the signal to GDB, and pray for the best. */
2061 lwp
->collecting_fast_tracepoint
2062 = fast_tpoint_collect_result::not_collecting
;
2064 if (r
!= fast_tpoint_collect_result::not_collecting
2065 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2066 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2069 struct regcache
*regcache
;
2071 /* The si_addr on a few signals references the address
2072 of the faulting instruction. Adjust that as
2074 if ((WSTOPSIG (*wstat
) == SIGILL
2075 || WSTOPSIG (*wstat
) == SIGFPE
2076 || WSTOPSIG (*wstat
) == SIGBUS
2077 || WSTOPSIG (*wstat
) == SIGSEGV
)
2078 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2079 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2080 /* Final check just to make sure we don't clobber
2081 the siginfo of non-kernel-sent signals. */
2082 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2084 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2085 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2086 (PTRACE_TYPE_ARG3
) 0, &info
);
2089 regcache
= get_thread_regcache (current_thread
, 1);
2090 low_set_pc (regcache
, status
.tpoint_addr
);
2091 lwp
->stop_pc
= status
.tpoint_addr
;
2093 /* Cancel any fast tracepoint lock this thread was
2095 force_unlock_trace_buffer ();
2098 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2101 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2102 "stopping all threads momentarily.\n");
2104 stop_all_lwps (1, lwp
);
2106 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2107 lwp
->exit_jump_pad_bkpt
= NULL
;
2109 unstop_all_lwps (1, lwp
);
2111 gdb_assert (lwp
->suspended
>= 0);
2117 debug_printf ("Checking whether LWP %ld needs to move out of the "
2119 lwpid_of (current_thread
));
2121 current_thread
= saved_thread
;
2125 /* Enqueue one signal in the "signals to report later when out of the
2129 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2131 struct pending_signals
*p_sig
;
2132 struct thread_info
*thread
= get_lwp_thread (lwp
);
2135 debug_printf ("Deferring signal %d for LWP %ld.\n",
2136 WSTOPSIG (*wstat
), lwpid_of (thread
));
2140 struct pending_signals
*sig
;
2142 for (sig
= lwp
->pending_signals_to_report
;
2145 debug_printf (" Already queued %d\n",
2148 debug_printf (" (no more currently queued signals)\n");
2151 /* Don't enqueue non-RT signals if they are already in the deferred
2152 queue. (SIGSTOP being the easiest signal to see ending up here
2154 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2156 struct pending_signals
*sig
;
2158 for (sig
= lwp
->pending_signals_to_report
;
2162 if (sig
->signal
== WSTOPSIG (*wstat
))
2165 debug_printf ("Not requeuing already queued non-RT signal %d"
2174 p_sig
= XCNEW (struct pending_signals
);
2175 p_sig
->prev
= lwp
->pending_signals_to_report
;
2176 p_sig
->signal
= WSTOPSIG (*wstat
);
2178 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2181 lwp
->pending_signals_to_report
= p_sig
;
2184 /* Dequeue one signal from the "signals to report later when out of
2185 the jump pad" list. */
2188 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2190 struct thread_info
*thread
= get_lwp_thread (lwp
);
2192 if (lwp
->pending_signals_to_report
!= NULL
)
2194 struct pending_signals
**p_sig
;
2196 p_sig
= &lwp
->pending_signals_to_report
;
2197 while ((*p_sig
)->prev
!= NULL
)
2198 p_sig
= &(*p_sig
)->prev
;
2200 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2201 if ((*p_sig
)->info
.si_signo
!= 0)
2202 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2208 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2209 WSTOPSIG (*wstat
), lwpid_of (thread
));
2213 struct pending_signals
*sig
;
2215 for (sig
= lwp
->pending_signals_to_report
;
2218 debug_printf (" Still queued %d\n",
2221 debug_printf (" (no more queued signals)\n");
2231 linux_process_target::check_stopped_by_watchpoint (lwp_info
*child
)
2233 struct thread_info
*saved_thread
= current_thread
;
2234 current_thread
= get_lwp_thread (child
);
2236 if (low_stopped_by_watchpoint ())
2238 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2239 child
->stopped_data_address
= low_stopped_data_address ();
2242 current_thread
= saved_thread
;
2244 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2248 linux_process_target::low_stopped_by_watchpoint ()
2254 linux_process_target::low_stopped_data_address ()
2259 /* Return the ptrace options that we want to try to enable. */
2262 linux_low_ptrace_options (int attached
)
2264 client_state
&cs
= get_client_state ();
2268 options
|= PTRACE_O_EXITKILL
;
2270 if (cs
.report_fork_events
)
2271 options
|= PTRACE_O_TRACEFORK
;
2273 if (cs
.report_vfork_events
)
2274 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2276 if (cs
.report_exec_events
)
2277 options
|= PTRACE_O_TRACEEXEC
;
2279 options
|= PTRACE_O_TRACESYSGOOD
;
2285 linux_process_target::filter_event (int lwpid
, int wstat
)
2287 client_state
&cs
= get_client_state ();
2288 struct lwp_info
*child
;
2289 struct thread_info
*thread
;
2290 int have_stop_pc
= 0;
2292 child
= find_lwp_pid (ptid_t (lwpid
));
2294 /* Check for stop events reported by a process we didn't already
2295 know about - anything not already in our LWP list.
2297 If we're expecting to receive stopped processes after
2298 fork, vfork, and clone events, then we'll just add the
2299 new one to our list and go back to waiting for the event
2300 to be reported - the stopped process might be returned
2301 from waitpid before or after the event is.
2303 But note the case of a non-leader thread exec'ing after the
2304 leader having exited, and gone from our lists (because
2305 check_zombie_leaders deleted it). The non-leader thread
2306 changes its tid to the tgid. */
2308 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2309 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2313 /* A multi-thread exec after we had seen the leader exiting. */
2316 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2317 "after exec.\n", lwpid
);
2320 child_ptid
= ptid_t (lwpid
, lwpid
, 0);
2321 child
= add_lwp (child_ptid
);
2323 current_thread
= child
->thread
;
2326 /* If we didn't find a process, one of two things presumably happened:
2327 - A process we started and then detached from has exited. Ignore it.
2328 - A process we are controlling has forked and the new child's stop
2329 was reported to us by the kernel. Save its PID. */
2330 if (child
== NULL
&& WIFSTOPPED (wstat
))
2332 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2335 else if (child
== NULL
)
2338 thread
= get_lwp_thread (child
);
2342 child
->last_status
= wstat
;
2344 /* Check if the thread has exited. */
2345 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2348 debug_printf ("LLFE: %d exited.\n", lwpid
);
2350 if (finish_step_over (child
))
2352 /* Unsuspend all other LWPs, and set them back running again. */
2353 unsuspend_all_lwps (child
);
2356 /* If there is at least one more LWP, then the exit signal was
2357 not the end of the debugged application and should be
2358 ignored, unless GDB wants to hear about thread exits. */
2359 if (cs
.report_thread_events
2360 || last_thread_of_process_p (pid_of (thread
)))
2362 /* Since events are serialized to GDB core, and we can't
2363 report this one right now. Leave the status pending for
2364 the next time we're able to report it. */
2365 mark_lwp_dead (child
, wstat
);
2375 gdb_assert (WIFSTOPPED (wstat
));
2377 if (WIFSTOPPED (wstat
))
2379 struct process_info
*proc
;
2381 /* Architecture-specific setup after inferior is running. */
2382 proc
= find_process_pid (pid_of (thread
));
2383 if (proc
->tdesc
== NULL
)
2387 /* This needs to happen after we have attached to the
2388 inferior and it is stopped for the first time, but
2389 before we access any inferior registers. */
2390 arch_setup_thread (thread
);
2394 /* The process is started, but GDBserver will do
2395 architecture-specific setup after the program stops at
2396 the first instruction. */
2397 child
->status_pending_p
= 1;
2398 child
->status_pending
= wstat
;
2404 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2406 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2407 int options
= linux_low_ptrace_options (proc
->attached
);
2409 linux_enable_event_reporting (lwpid
, options
);
2410 child
->must_set_ptrace_flags
= 0;
2413 /* Always update syscall_state, even if it will be filtered later. */
2414 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2416 child
->syscall_state
2417 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2418 ? TARGET_WAITKIND_SYSCALL_RETURN
2419 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2423 /* Almost all other ptrace-stops are known to be outside of system
2424 calls, with further exceptions in handle_extended_wait. */
2425 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2428 /* Be careful to not overwrite stop_pc until save_stop_reason is
2430 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2431 && linux_is_extended_waitstatus (wstat
))
2433 child
->stop_pc
= get_pc (child
);
2434 if (handle_extended_wait (&child
, wstat
))
2436 /* The event has been handled, so just return without
2442 if (linux_wstatus_maybe_breakpoint (wstat
))
2444 if (save_stop_reason (child
))
2449 child
->stop_pc
= get_pc (child
);
2451 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2452 && child
->stop_expected
)
2455 debug_printf ("Expected stop.\n");
2456 child
->stop_expected
= 0;
2458 if (thread
->last_resume_kind
== resume_stop
)
2460 /* We want to report the stop to the core. Treat the
2461 SIGSTOP as a normal event. */
2463 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2464 target_pid_to_str (ptid_of (thread
)));
2466 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2468 /* Stopping threads. We don't want this SIGSTOP to end up
2471 debug_printf ("LLW: SIGSTOP caught for %s "
2472 "while stopping threads.\n",
2473 target_pid_to_str (ptid_of (thread
)));
2478 /* This is a delayed SIGSTOP. Filter out the event. */
2480 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2481 child
->stepping
? "step" : "continue",
2482 target_pid_to_str (ptid_of (thread
)));
2484 resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2489 child
->status_pending_p
= 1;
2490 child
->status_pending
= wstat
;
2495 linux_process_target::maybe_hw_step (thread_info
*thread
)
2497 if (supports_hardware_single_step ())
2501 /* GDBserver must insert single-step breakpoint for software
2503 gdb_assert (has_single_step_breakpoints (thread
));
2509 linux_process_target::resume_stopped_resumed_lwps (thread_info
*thread
)
2511 struct lwp_info
*lp
= get_thread_lwp (thread
);
2515 && !lp
->status_pending_p
2516 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2520 if (thread
->last_resume_kind
== resume_step
)
2521 step
= maybe_hw_step (thread
);
2524 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2525 target_pid_to_str (ptid_of (thread
)),
2526 paddress (lp
->stop_pc
),
2529 resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2534 linux_process_target::wait_for_event_filtered (ptid_t wait_ptid
,
2536 int *wstatp
, int options
)
2538 struct thread_info
*event_thread
;
2539 struct lwp_info
*event_child
, *requested_child
;
2540 sigset_t block_mask
, prev_mask
;
2543 /* N.B. event_thread points to the thread_info struct that contains
2544 event_child. Keep them in sync. */
2545 event_thread
= NULL
;
2547 requested_child
= NULL
;
2549 /* Check for a lwp with a pending status. */
2551 if (filter_ptid
== minus_one_ptid
|| filter_ptid
.is_pid ())
2553 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2555 return status_pending_p_callback (thread
, filter_ptid
);
2558 if (event_thread
!= NULL
)
2559 event_child
= get_thread_lwp (event_thread
);
2560 if (debug_threads
&& event_thread
)
2561 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2563 else if (filter_ptid
!= null_ptid
)
2565 requested_child
= find_lwp_pid (filter_ptid
);
2567 if (stopping_threads
== NOT_STOPPING_THREADS
2568 && requested_child
->status_pending_p
2569 && (requested_child
->collecting_fast_tracepoint
2570 != fast_tpoint_collect_result::not_collecting
))
2572 enqueue_one_deferred_signal (requested_child
,
2573 &requested_child
->status_pending
);
2574 requested_child
->status_pending_p
= 0;
2575 requested_child
->status_pending
= 0;
2576 resume_one_lwp (requested_child
, 0, 0, NULL
);
2579 if (requested_child
->suspended
2580 && requested_child
->status_pending_p
)
2582 internal_error (__FILE__
, __LINE__
,
2583 "requesting an event out of a"
2584 " suspended child?");
2587 if (requested_child
->status_pending_p
)
2589 event_child
= requested_child
;
2590 event_thread
= get_lwp_thread (event_child
);
2594 if (event_child
!= NULL
)
2597 debug_printf ("Got an event from pending child %ld (%04x)\n",
2598 lwpid_of (event_thread
), event_child
->status_pending
);
2599 *wstatp
= event_child
->status_pending
;
2600 event_child
->status_pending_p
= 0;
2601 event_child
->status_pending
= 0;
2602 current_thread
= event_thread
;
2603 return lwpid_of (event_thread
);
2606 /* But if we don't find a pending event, we'll have to wait.
2608 We only enter this loop if no process has a pending wait status.
2609 Thus any action taken in response to a wait status inside this
2610 loop is responding as soon as we detect the status, not after any
2613 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2614 all signals while here. */
2615 sigfillset (&block_mask
);
2616 gdb_sigmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2618 /* Always pull all events out of the kernel. We'll randomly select
2619 an event LWP out of all that have events, to prevent
2621 while (event_child
== NULL
)
2625 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2628 - If the thread group leader exits while other threads in the
2629 thread group still exist, waitpid(TGID, ...) hangs. That
2630 waitpid won't return an exit status until the other threads
2631 in the group are reaped.
2633 - When a non-leader thread execs, that thread just vanishes
2634 without reporting an exit (so we'd hang if we waited for it
2635 explicitly in that case). The exec event is reported to
2638 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2641 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2642 ret
, errno
? safe_strerror (errno
) : "ERRNO-OK");
2648 debug_printf ("LLW: waitpid %ld received %s\n",
2649 (long) ret
, status_to_str (*wstatp
));
2652 /* Filter all events. IOW, leave all events pending. We'll
2653 randomly select an event LWP out of all that have events
2655 filter_event (ret
, *wstatp
);
2656 /* Retry until nothing comes out of waitpid. A single
2657 SIGCHLD can indicate more than one child stopped. */
2661 /* Now that we've pulled all events out of the kernel, resume
2662 LWPs that don't have an interesting event to report. */
2663 if (stopping_threads
== NOT_STOPPING_THREADS
)
2664 for_each_thread ([this] (thread_info
*thread
)
2666 resume_stopped_resumed_lwps (thread
);
2669 /* ... and find an LWP with a status to report to the core, if
2671 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2673 return status_pending_p_callback (thread
, filter_ptid
);
2676 if (event_thread
!= NULL
)
2678 event_child
= get_thread_lwp (event_thread
);
2679 *wstatp
= event_child
->status_pending
;
2680 event_child
->status_pending_p
= 0;
2681 event_child
->status_pending
= 0;
2685 /* Check for zombie thread group leaders. Those can't be reaped
2686 until all other threads in the thread group are. */
2687 check_zombie_leaders ();
2689 auto not_stopped
= [&] (thread_info
*thread
)
2691 return not_stopped_callback (thread
, wait_ptid
);
2694 /* If there are no resumed children left in the set of LWPs we
2695 want to wait for, bail. We can't just block in
2696 waitpid/sigsuspend, because lwps might have been left stopped
2697 in trace-stop state, and we'd be stuck forever waiting for
2698 their status to change (which would only happen if we resumed
2699 them). Even if WNOHANG is set, this return code is preferred
2700 over 0 (below), as it is more detailed. */
2701 if (find_thread (not_stopped
) == NULL
)
2704 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2705 gdb_sigmask (SIG_SETMASK
, &prev_mask
, NULL
);
2709 /* No interesting event to report to the caller. */
2710 if ((options
& WNOHANG
))
2713 debug_printf ("WNOHANG set, no event found\n");
2715 gdb_sigmask (SIG_SETMASK
, &prev_mask
, NULL
);
2719 /* Block until we get an event reported with SIGCHLD. */
2721 debug_printf ("sigsuspend'ing\n");
2723 sigsuspend (&prev_mask
);
2724 gdb_sigmask (SIG_SETMASK
, &prev_mask
, NULL
);
2728 gdb_sigmask (SIG_SETMASK
, &prev_mask
, NULL
);
2730 current_thread
= event_thread
;
2732 return lwpid_of (event_thread
);
2736 linux_process_target::wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2738 return wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2741 /* Select one LWP out of those that have events pending. */
2744 select_event_lwp (struct lwp_info
**orig_lp
)
2746 struct thread_info
*event_thread
= NULL
;
2748 /* In all-stop, give preference to the LWP that is being
2749 single-stepped. There will be at most one, and it's the LWP that
2750 the core is most interested in. If we didn't do this, then we'd
2751 have to handle pending step SIGTRAPs somehow in case the core
2752 later continues the previously-stepped thread, otherwise we'd
2753 report the pending SIGTRAP, and the core, not having stepped the
2754 thread, wouldn't understand what the trap was for, and therefore
2755 would report it to the user as a random signal. */
2758 event_thread
= find_thread ([] (thread_info
*thread
)
2760 lwp_info
*lp
= get_thread_lwp (thread
);
2762 return (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2763 && thread
->last_resume_kind
== resume_step
2764 && lp
->status_pending_p
);
2767 if (event_thread
!= NULL
)
2770 debug_printf ("SEL: Select single-step %s\n",
2771 target_pid_to_str (ptid_of (event_thread
)));
2774 if (event_thread
== NULL
)
2776 /* No single-stepping LWP. Select one at random, out of those
2777 which have had events. */
2779 event_thread
= find_thread_in_random ([&] (thread_info
*thread
)
2781 lwp_info
*lp
= get_thread_lwp (thread
);
2783 /* Only resumed LWPs that have an event pending. */
2784 return (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2785 && lp
->status_pending_p
);
2789 if (event_thread
!= NULL
)
2791 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2793 /* Switch the event LWP. */
2794 *orig_lp
= event_lp
;
2798 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2802 unsuspend_all_lwps (struct lwp_info
*except
)
2804 for_each_thread ([&] (thread_info
*thread
)
2806 lwp_info
*lwp
= get_thread_lwp (thread
);
2809 lwp_suspended_decr (lwp
);
2813 static bool lwp_running (thread_info
*thread
);
2815 /* Stabilize threads (move out of jump pads).
2817 If a thread is midway collecting a fast tracepoint, we need to
2818 finish the collection and move it out of the jump pad before
2819 reporting the signal.
2821 This avoids recursion while collecting (when a signal arrives
2822 midway, and the signal handler itself collects), which would trash
2823 the trace buffer. In case the user set a breakpoint in a signal
2824 handler, this avoids the backtrace showing the jump pad, etc..
2825 Most importantly, there are certain things we can't do safely if
2826 threads are stopped in a jump pad (or in its callee's). For
2829 - starting a new trace run. A thread still collecting the
2830 previous run, could trash the trace buffer when resumed. The trace
2831 buffer control structures would have been reset but the thread had
2832 no way to tell. The thread could even midway memcpy'ing to the
2833 buffer, which would mean that when resumed, it would clobber the
2834 trace buffer that had been set for a new run.
2836 - we can't rewrite/reuse the jump pads for new tracepoints
2837 safely. Say you do tstart while a thread is stopped midway while
2838 collecting. When the thread is later resumed, it finishes the
2839 collection, and returns to the jump pad, to execute the original
2840 instruction that was under the tracepoint jump at the time the
2841 older run had been started. If the jump pad had been rewritten
2842 since for something else in the new run, the thread would now
2843 execute the wrong / random instructions. */
2846 linux_process_target::stabilize_threads ()
2848 thread_info
*thread_stuck
= find_thread ([this] (thread_info
*thread
)
2850 return stuck_in_jump_pad (thread
);
2853 if (thread_stuck
!= NULL
)
2856 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2857 lwpid_of (thread_stuck
));
2861 thread_info
*saved_thread
= current_thread
;
2863 stabilizing_threads
= 1;
2866 for_each_thread ([this] (thread_info
*thread
)
2868 move_out_of_jump_pad (thread
);
2871 /* Loop until all are stopped out of the jump pads. */
2872 while (find_thread (lwp_running
) != NULL
)
2874 struct target_waitstatus ourstatus
;
2875 struct lwp_info
*lwp
;
2878 /* Note that we go through the full wait even loop. While
2879 moving threads out of jump pad, we need to be able to step
2880 over internal breakpoints and such. */
2881 wait_1 (minus_one_ptid
, &ourstatus
, 0);
2883 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2885 lwp
= get_thread_lwp (current_thread
);
2888 lwp_suspended_inc (lwp
);
2890 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
2891 || current_thread
->last_resume_kind
== resume_stop
)
2893 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
2894 enqueue_one_deferred_signal (lwp
, &wstat
);
2899 unsuspend_all_lwps (NULL
);
2901 stabilizing_threads
= 0;
2903 current_thread
= saved_thread
;
2907 thread_stuck
= find_thread ([this] (thread_info
*thread
)
2909 return stuck_in_jump_pad (thread
);
2912 if (thread_stuck
!= NULL
)
2913 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
2914 lwpid_of (thread_stuck
));
2918 /* Convenience function that is called when the kernel reports an
2919 event that is not passed out to GDB. */
2922 ignore_event (struct target_waitstatus
*ourstatus
)
2924 /* If we got an event, there may still be others, as a single
2925 SIGCHLD can indicate more than one child stopped. This forces
2926 another target_wait call. */
2929 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2934 linux_process_target::filter_exit_event (lwp_info
*event_child
,
2935 target_waitstatus
*ourstatus
)
2937 client_state
&cs
= get_client_state ();
2938 struct thread_info
*thread
= get_lwp_thread (event_child
);
2939 ptid_t ptid
= ptid_of (thread
);
2941 if (!last_thread_of_process_p (pid_of (thread
)))
2943 if (cs
.report_thread_events
)
2944 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
2946 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2948 delete_lwp (event_child
);
2953 /* Returns 1 if GDB is interested in any event_child syscalls. */
2956 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
2958 struct thread_info
*thread
= get_lwp_thread (event_child
);
2959 struct process_info
*proc
= get_thread_process (thread
);
2961 return !proc
->syscalls_to_catch
.empty ();
2964 /* Returns 1 if GDB is interested in the event_child syscall.
2965 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
2968 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
2971 struct thread_info
*thread
= get_lwp_thread (event_child
);
2972 struct process_info
*proc
= get_thread_process (thread
);
2974 if (proc
->syscalls_to_catch
.empty ())
2977 if (proc
->syscalls_to_catch
[0] == ANY_SYSCALL
)
2980 get_syscall_trapinfo (event_child
, &sysno
);
2982 for (int iter
: proc
->syscalls_to_catch
)
2990 linux_process_target::wait_1 (ptid_t ptid
, target_waitstatus
*ourstatus
,
2993 client_state
&cs
= get_client_state ();
2995 struct lwp_info
*event_child
;
2998 int step_over_finished
;
2999 int bp_explains_trap
;
3000 int maybe_internal_trap
;
3009 debug_printf ("wait_1: [%s]\n", target_pid_to_str (ptid
));
3012 /* Translate generic target options into linux options. */
3014 if (target_options
& TARGET_WNOHANG
)
3017 bp_explains_trap
= 0;
3020 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3022 auto status_pending_p_any
= [&] (thread_info
*thread
)
3024 return status_pending_p_callback (thread
, minus_one_ptid
);
3027 auto not_stopped
= [&] (thread_info
*thread
)
3029 return not_stopped_callback (thread
, minus_one_ptid
);
3032 /* Find a resumed LWP, if any. */
3033 if (find_thread (status_pending_p_any
) != NULL
)
3035 else if (find_thread (not_stopped
) != NULL
)
3040 if (step_over_bkpt
== null_ptid
)
3041 pid
= wait_for_event (ptid
, &w
, options
);
3045 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3046 target_pid_to_str (step_over_bkpt
));
3047 pid
= wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3050 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3052 gdb_assert (target_options
& TARGET_WNOHANG
);
3056 debug_printf ("wait_1 ret = null_ptid, "
3057 "TARGET_WAITKIND_IGNORE\n");
3061 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3068 debug_printf ("wait_1 ret = null_ptid, "
3069 "TARGET_WAITKIND_NO_RESUMED\n");
3073 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3077 event_child
= get_thread_lwp (current_thread
);
3079 /* wait_for_event only returns an exit status for the last
3080 child of a process. Report it. */
3081 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3085 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3086 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3090 debug_printf ("wait_1 ret = %s, exited with "
3092 target_pid_to_str (ptid_of (current_thread
)),
3099 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3100 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3104 debug_printf ("wait_1 ret = %s, terminated with "
3106 target_pid_to_str (ptid_of (current_thread
)),
3112 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3113 return filter_exit_event (event_child
, ourstatus
);
3115 return ptid_of (current_thread
);
3118 /* If step-over executes a breakpoint instruction, in the case of a
3119 hardware single step it means a gdb/gdbserver breakpoint had been
3120 planted on top of a permanent breakpoint, in the case of a software
3121 single step it may just mean that gdbserver hit the reinsert breakpoint.
3122 The PC has been adjusted by save_stop_reason to point at
3123 the breakpoint address.
3124 So in the case of the hardware single step advance the PC manually
3125 past the breakpoint and in the case of software single step advance only
3126 if it's not the single_step_breakpoint we are hitting.
3127 This avoids that a program would keep trapping a permanent breakpoint
3129 if (step_over_bkpt
!= null_ptid
3130 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3131 && (event_child
->stepping
3132 || !single_step_breakpoint_inserted_here (event_child
->stop_pc
)))
3134 int increment_pc
= 0;
3135 int breakpoint_kind
= 0;
3136 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3138 breakpoint_kind
= breakpoint_kind_from_current_state (&stop_pc
);
3139 sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3143 debug_printf ("step-over for %s executed software breakpoint\n",
3144 target_pid_to_str (ptid_of (current_thread
)));
3147 if (increment_pc
!= 0)
3149 struct regcache
*regcache
3150 = get_thread_regcache (current_thread
, 1);
3152 event_child
->stop_pc
+= increment_pc
;
3153 low_set_pc (regcache
, event_child
->stop_pc
);
3155 if (!low_breakpoint_at (event_child
->stop_pc
))
3156 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3160 /* If this event was not handled before, and is not a SIGTRAP, we
3161 report it. SIGILL and SIGSEGV are also treated as traps in case
3162 a breakpoint is inserted at the current PC. If this target does
3163 not support internal breakpoints at all, we also report the
3164 SIGTRAP without further processing; it's of no concern to us. */
3166 = (low_supports_breakpoints ()
3167 && (WSTOPSIG (w
) == SIGTRAP
3168 || ((WSTOPSIG (w
) == SIGILL
3169 || WSTOPSIG (w
) == SIGSEGV
)
3170 && low_breakpoint_at (event_child
->stop_pc
))));
3172 if (maybe_internal_trap
)
3174 /* Handle anything that requires bookkeeping before deciding to
3175 report the event or continue waiting. */
3177 /* First check if we can explain the SIGTRAP with an internal
3178 breakpoint, or if we should possibly report the event to GDB.
3179 Do this before anything that may remove or insert a
3181 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3183 /* We have a SIGTRAP, possibly a step-over dance has just
3184 finished. If so, tweak the state machine accordingly,
3185 reinsert breakpoints and delete any single-step
3187 step_over_finished
= finish_step_over (event_child
);
3189 /* Now invoke the callbacks of any internal breakpoints there. */
3190 check_breakpoints (event_child
->stop_pc
);
3192 /* Handle tracepoint data collecting. This may overflow the
3193 trace buffer, and cause a tracing stop, removing
3195 trace_event
= handle_tracepoints (event_child
);
3197 if (bp_explains_trap
)
3200 debug_printf ("Hit a gdbserver breakpoint.\n");
3205 /* We have some other signal, possibly a step-over dance was in
3206 progress, and it should be cancelled too. */
3207 step_over_finished
= finish_step_over (event_child
);
3210 /* We have all the data we need. Either report the event to GDB, or
3211 resume threads and keep waiting for more. */
3213 /* If we're collecting a fast tracepoint, finish the collection and
3214 move out of the jump pad before delivering a signal. See
3215 linux_stabilize_threads. */
3218 && WSTOPSIG (w
) != SIGTRAP
3219 && supports_fast_tracepoints ()
3220 && agent_loaded_p ())
3223 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3224 "to defer or adjust it.\n",
3225 WSTOPSIG (w
), lwpid_of (current_thread
));
3227 /* Allow debugging the jump pad itself. */
3228 if (current_thread
->last_resume_kind
!= resume_step
3229 && maybe_move_out_of_jump_pad (event_child
, &w
))
3231 enqueue_one_deferred_signal (event_child
, &w
);
3234 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3235 WSTOPSIG (w
), lwpid_of (current_thread
));
3237 resume_one_lwp (event_child
, 0, 0, NULL
);
3241 return ignore_event (ourstatus
);
3245 if (event_child
->collecting_fast_tracepoint
3246 != fast_tpoint_collect_result::not_collecting
)
3249 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3250 "Check if we're already there.\n",
3251 lwpid_of (current_thread
),
3252 (int) event_child
->collecting_fast_tracepoint
);
3256 event_child
->collecting_fast_tracepoint
3257 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3259 if (event_child
->collecting_fast_tracepoint
3260 != fast_tpoint_collect_result::before_insn
)
3262 /* No longer need this breakpoint. */
3263 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3266 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3267 "stopping all threads momentarily.\n");
3269 /* Other running threads could hit this breakpoint.
3270 We don't handle moribund locations like GDB does,
3271 instead we always pause all threads when removing
3272 breakpoints, so that any step-over or
3273 decr_pc_after_break adjustment is always taken
3274 care of while the breakpoint is still
3276 stop_all_lwps (1, event_child
);
3278 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3279 event_child
->exit_jump_pad_bkpt
= NULL
;
3281 unstop_all_lwps (1, event_child
);
3283 gdb_assert (event_child
->suspended
>= 0);
3287 if (event_child
->collecting_fast_tracepoint
3288 == fast_tpoint_collect_result::not_collecting
)
3291 debug_printf ("fast tracepoint finished "
3292 "collecting successfully.\n");
3294 /* We may have a deferred signal to report. */
3295 if (dequeue_one_deferred_signal (event_child
, &w
))
3298 debug_printf ("dequeued one signal.\n");
3303 debug_printf ("no deferred signals.\n");
3305 if (stabilizing_threads
)
3307 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3308 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3312 debug_printf ("wait_1 ret = %s, stopped "
3313 "while stabilizing threads\n",
3314 target_pid_to_str (ptid_of (current_thread
)));
3318 return ptid_of (current_thread
);
3324 /* Check whether GDB would be interested in this event. */
3326 /* Check if GDB is interested in this syscall. */
3328 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3329 && !gdb_catch_this_syscall_p (event_child
))
3333 debug_printf ("Ignored syscall for LWP %ld.\n",
3334 lwpid_of (current_thread
));
3337 resume_one_lwp (event_child
, event_child
->stepping
, 0, NULL
);
3341 return ignore_event (ourstatus
);
3344 /* If GDB is not interested in this signal, don't stop other
3345 threads, and don't report it to GDB. Just resume the inferior
3346 right away. We do this for threading-related signals as well as
3347 any that GDB specifically requested we ignore. But never ignore
3348 SIGSTOP if we sent it ourselves, and do not ignore signals when
3349 stepping - they may require special handling to skip the signal
3350 handler. Also never ignore signals that could be caused by a
3353 && current_thread
->last_resume_kind
!= resume_step
3355 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3356 (current_process ()->priv
->thread_db
!= NULL
3357 && (WSTOPSIG (w
) == __SIGRTMIN
3358 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3361 (cs
.pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3362 && !(WSTOPSIG (w
) == SIGSTOP
3363 && current_thread
->last_resume_kind
== resume_stop
)
3364 && !linux_wstatus_maybe_breakpoint (w
))))
3366 siginfo_t info
, *info_p
;
3369 debug_printf ("Ignored signal %d for LWP %ld.\n",
3370 WSTOPSIG (w
), lwpid_of (current_thread
));
3372 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3373 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3378 if (step_over_finished
)
3380 /* We cancelled this thread's step-over above. We still
3381 need to unsuspend all other LWPs, and set them back
3382 running again while the signal handler runs. */
3383 unsuspend_all_lwps (event_child
);
3385 /* Enqueue the pending signal info so that proceed_all_lwps
3387 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3389 proceed_all_lwps ();
3393 resume_one_lwp (event_child
, event_child
->stepping
,
3394 WSTOPSIG (w
), info_p
);
3400 return ignore_event (ourstatus
);
3403 /* Note that all addresses are always "out of the step range" when
3404 there's no range to begin with. */
3405 in_step_range
= lwp_in_step_range (event_child
);
3407 /* If GDB wanted this thread to single step, and the thread is out
3408 of the step range, we always want to report the SIGTRAP, and let
3409 GDB handle it. Watchpoints should always be reported. So should
3410 signals we can't explain. A SIGTRAP we can't explain could be a
3411 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3412 do, we're be able to handle GDB breakpoints on top of internal
3413 breakpoints, by handling the internal breakpoint and still
3414 reporting the event to GDB. If we don't, we're out of luck, GDB
3415 won't see the breakpoint hit. If we see a single-step event but
3416 the thread should be continuing, don't pass the trap to gdb.
3417 That indicates that we had previously finished a single-step but
3418 left the single-step pending -- see
3419 complete_ongoing_step_over. */
3420 report_to_gdb
= (!maybe_internal_trap
3421 || (current_thread
->last_resume_kind
== resume_step
3423 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3425 && !bp_explains_trap
3427 && !step_over_finished
3428 && !(current_thread
->last_resume_kind
== resume_continue
3429 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3430 || (gdb_breakpoint_here (event_child
->stop_pc
)
3431 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3432 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3433 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3435 run_breakpoint_commands (event_child
->stop_pc
);
3437 /* We found no reason GDB would want us to stop. We either hit one
3438 of our own breakpoints, or finished an internal step GDB
3439 shouldn't know about. */
3444 if (bp_explains_trap
)
3445 debug_printf ("Hit a gdbserver breakpoint.\n");
3446 if (step_over_finished
)
3447 debug_printf ("Step-over finished.\n");
3449 debug_printf ("Tracepoint event.\n");
3450 if (lwp_in_step_range (event_child
))
3451 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3452 paddress (event_child
->stop_pc
),
3453 paddress (event_child
->step_range_start
),
3454 paddress (event_child
->step_range_end
));
3457 /* We're not reporting this breakpoint to GDB, so apply the
3458 decr_pc_after_break adjustment to the inferior's regcache
3461 if (low_supports_breakpoints ())
3463 struct regcache
*regcache
3464 = get_thread_regcache (current_thread
, 1);
3465 low_set_pc (regcache
, event_child
->stop_pc
);
3468 if (step_over_finished
)
3470 /* If we have finished stepping over a breakpoint, we've
3471 stopped and suspended all LWPs momentarily except the
3472 stepping one. This is where we resume them all again.
3473 We're going to keep waiting, so use proceed, which
3474 handles stepping over the next breakpoint. */
3475 unsuspend_all_lwps (event_child
);
3479 /* Remove the single-step breakpoints if any. Note that
3480 there isn't single-step breakpoint if we finished stepping
3482 if (supports_software_single_step ()
3483 && has_single_step_breakpoints (current_thread
))
3485 stop_all_lwps (0, event_child
);
3486 delete_single_step_breakpoints (current_thread
);
3487 unstop_all_lwps (0, event_child
);
3492 debug_printf ("proceeding all threads.\n");
3493 proceed_all_lwps ();
3498 return ignore_event (ourstatus
);
3503 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3506 = target_waitstatus_to_string (&event_child
->waitstatus
);
3508 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3509 lwpid_of (get_lwp_thread (event_child
)), str
.c_str ());
3511 if (current_thread
->last_resume_kind
== resume_step
)
3513 if (event_child
->step_range_start
== event_child
->step_range_end
)
3514 debug_printf ("GDB wanted to single-step, reporting event.\n");
3515 else if (!lwp_in_step_range (event_child
))
3516 debug_printf ("Out of step range, reporting event.\n");
3518 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3519 debug_printf ("Stopped by watchpoint.\n");
3520 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3521 debug_printf ("Stopped by GDB breakpoint.\n");
3523 debug_printf ("Hit a non-gdbserver trap event.\n");
3526 /* Alright, we're going to report a stop. */
3528 /* Remove single-step breakpoints. */
3529 if (supports_software_single_step ())
3531 /* Remove single-step breakpoints or not. It it is true, stop all
3532 lwps, so that other threads won't hit the breakpoint in the
3534 int remove_single_step_breakpoints_p
= 0;
3538 remove_single_step_breakpoints_p
3539 = has_single_step_breakpoints (current_thread
);
3543 /* In all-stop, a stop reply cancels all previous resume
3544 requests. Delete all single-step breakpoints. */
3546 find_thread ([&] (thread_info
*thread
) {
3547 if (has_single_step_breakpoints (thread
))
3549 remove_single_step_breakpoints_p
= 1;
3557 if (remove_single_step_breakpoints_p
)
3559 /* If we remove single-step breakpoints from memory, stop all lwps,
3560 so that other threads won't hit the breakpoint in the staled
3562 stop_all_lwps (0, event_child
);
3566 gdb_assert (has_single_step_breakpoints (current_thread
));
3567 delete_single_step_breakpoints (current_thread
);
3571 for_each_thread ([] (thread_info
*thread
){
3572 if (has_single_step_breakpoints (thread
))
3573 delete_single_step_breakpoints (thread
);
3577 unstop_all_lwps (0, event_child
);
3581 if (!stabilizing_threads
)
3583 /* In all-stop, stop all threads. */
3585 stop_all_lwps (0, NULL
);
3587 if (step_over_finished
)
3591 /* If we were doing a step-over, all other threads but
3592 the stepping one had been paused in start_step_over,
3593 with their suspend counts incremented. We don't want
3594 to do a full unstop/unpause, because we're in
3595 all-stop mode (so we want threads stopped), but we
3596 still need to unsuspend the other threads, to
3597 decrement their `suspended' count back. */
3598 unsuspend_all_lwps (event_child
);
3602 /* If we just finished a step-over, then all threads had
3603 been momentarily paused. In all-stop, that's fine,
3604 we want threads stopped by now anyway. In non-stop,
3605 we need to re-resume threads that GDB wanted to be
3607 unstop_all_lwps (1, event_child
);
3611 /* If we're not waiting for a specific LWP, choose an event LWP
3612 from among those that have had events. Giving equal priority
3613 to all LWPs that have had events helps prevent
3615 if (ptid
== minus_one_ptid
)
3617 event_child
->status_pending_p
= 1;
3618 event_child
->status_pending
= w
;
3620 select_event_lwp (&event_child
);
3622 /* current_thread and event_child must stay in sync. */
3623 current_thread
= get_lwp_thread (event_child
);
3625 event_child
->status_pending_p
= 0;
3626 w
= event_child
->status_pending
;
3630 /* Stabilize threads (move out of jump pads). */
3632 target_stabilize_threads ();
3636 /* If we just finished a step-over, then all threads had been
3637 momentarily paused. In all-stop, that's fine, we want
3638 threads stopped by now anyway. In non-stop, we need to
3639 re-resume threads that GDB wanted to be running. */
3640 if (step_over_finished
)
3641 unstop_all_lwps (1, event_child
);
3644 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3646 /* If the reported event is an exit, fork, vfork or exec, let
3649 /* Break the unreported fork relationship chain. */
3650 if (event_child
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
3651 || event_child
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
)
3653 event_child
->fork_relative
->fork_relative
= NULL
;
3654 event_child
->fork_relative
= NULL
;
3657 *ourstatus
= event_child
->waitstatus
;
3658 /* Clear the event lwp's waitstatus since we handled it already. */
3659 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3662 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3664 /* Now that we've selected our final event LWP, un-adjust its PC if
3665 it was a software breakpoint, and the client doesn't know we can
3666 adjust the breakpoint ourselves. */
3667 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3668 && !cs
.swbreak_feature
)
3670 int decr_pc
= low_decr_pc_after_break ();
3674 struct regcache
*regcache
3675 = get_thread_regcache (current_thread
, 1);
3676 low_set_pc (regcache
, event_child
->stop_pc
+ decr_pc
);
3680 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3682 get_syscall_trapinfo (event_child
,
3683 &ourstatus
->value
.syscall_number
);
3684 ourstatus
->kind
= event_child
->syscall_state
;
3686 else if (current_thread
->last_resume_kind
== resume_stop
3687 && WSTOPSIG (w
) == SIGSTOP
)
3689 /* A thread that has been requested to stop by GDB with vCont;t,
3690 and it stopped cleanly, so report as SIG0. The use of
3691 SIGSTOP is an implementation detail. */
3692 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3694 else if (current_thread
->last_resume_kind
== resume_stop
3695 && WSTOPSIG (w
) != SIGSTOP
)
3697 /* A thread that has been requested to stop by GDB with vCont;t,
3698 but, it stopped for other reasons. */
3699 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3701 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3703 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3706 gdb_assert (step_over_bkpt
== null_ptid
);
3710 debug_printf ("wait_1 ret = %s, %d, %d\n",
3711 target_pid_to_str (ptid_of (current_thread
)),
3712 ourstatus
->kind
, ourstatus
->value
.sig
);
3716 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3717 return filter_exit_event (event_child
, ourstatus
);
3719 return ptid_of (current_thread
);
3722 /* Get rid of any pending event in the pipe. */
3724 async_file_flush (void)
3730 ret
= read (linux_event_pipe
[0], &buf
, 1);
3731 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3734 /* Put something in the pipe, so the event loop wakes up. */
3736 async_file_mark (void)
3740 async_file_flush ();
3743 ret
= write (linux_event_pipe
[1], "+", 1);
3744 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3746 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3747 be awakened anyway. */
3751 linux_process_target::wait (ptid_t ptid
,
3752 target_waitstatus
*ourstatus
,
3757 /* Flush the async file first. */
3758 if (target_is_async_p ())
3759 async_file_flush ();
3763 event_ptid
= wait_1 (ptid
, ourstatus
, target_options
);
3765 while ((target_options
& TARGET_WNOHANG
) == 0
3766 && event_ptid
== null_ptid
3767 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3769 /* If at least one stop was reported, there may be more. A single
3770 SIGCHLD can signal more than one child stop. */
3771 if (target_is_async_p ()
3772 && (target_options
& TARGET_WNOHANG
) != 0
3773 && event_ptid
!= null_ptid
)
3779 /* Send a signal to an LWP. */
3782 kill_lwp (unsigned long lwpid
, int signo
)
3787 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3788 if (errno
== ENOSYS
)
3790 /* If tkill fails, then we are not using nptl threads, a
3791 configuration we no longer support. */
3792 perror_with_name (("tkill"));
3798 linux_stop_lwp (struct lwp_info
*lwp
)
3804 send_sigstop (struct lwp_info
*lwp
)
3808 pid
= lwpid_of (get_lwp_thread (lwp
));
3810 /* If we already have a pending stop signal for this process, don't
3812 if (lwp
->stop_expected
)
3815 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3821 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3823 lwp
->stop_expected
= 1;
3824 kill_lwp (pid
, SIGSTOP
);
3828 send_sigstop (thread_info
*thread
, lwp_info
*except
)
3830 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3832 /* Ignore EXCEPT. */
3842 /* Increment the suspend count of an LWP, and stop it, if not stopped
3845 suspend_and_send_sigstop (thread_info
*thread
, lwp_info
*except
)
3847 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3849 /* Ignore EXCEPT. */
3853 lwp_suspended_inc (lwp
);
3855 send_sigstop (thread
, except
);
3859 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3861 /* Store the exit status for later. */
3862 lwp
->status_pending_p
= 1;
3863 lwp
->status_pending
= wstat
;
3865 /* Store in waitstatus as well, as there's nothing else to process
3867 if (WIFEXITED (wstat
))
3869 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
3870 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
3872 else if (WIFSIGNALED (wstat
))
3874 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
3875 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
3878 /* Prevent trying to stop it. */
3881 /* No further stops are expected from a dead lwp. */
3882 lwp
->stop_expected
= 0;
3885 /* Return true if LWP has exited already, and has a pending exit event
3886 to report to GDB. */
3889 lwp_is_marked_dead (struct lwp_info
*lwp
)
3891 return (lwp
->status_pending_p
3892 && (WIFEXITED (lwp
->status_pending
)
3893 || WIFSIGNALED (lwp
->status_pending
)));
3897 linux_process_target::wait_for_sigstop ()
3899 struct thread_info
*saved_thread
;
3904 saved_thread
= current_thread
;
3905 if (saved_thread
!= NULL
)
3906 saved_tid
= saved_thread
->id
;
3908 saved_tid
= null_ptid
; /* avoid bogus unused warning */
3911 debug_printf ("wait_for_sigstop: pulling events\n");
3913 /* Passing NULL_PTID as filter indicates we want all events to be
3914 left pending. Eventually this returns when there are no
3915 unwaited-for children left. */
3916 ret
= wait_for_event_filtered (minus_one_ptid
, null_ptid
, &wstat
, __WALL
);
3917 gdb_assert (ret
== -1);
3919 if (saved_thread
== NULL
|| mythread_alive (saved_tid
))
3920 current_thread
= saved_thread
;
3924 debug_printf ("Previously current thread died.\n");
3926 /* We can't change the current inferior behind GDB's back,
3927 otherwise, a subsequent command may apply to the wrong
3929 current_thread
= NULL
;
3934 linux_process_target::stuck_in_jump_pad (thread_info
*thread
)
3936 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3938 if (lwp
->suspended
!= 0)
3940 internal_error (__FILE__
, __LINE__
,
3941 "LWP %ld is suspended, suspended=%d\n",
3942 lwpid_of (thread
), lwp
->suspended
);
3944 gdb_assert (lwp
->stopped
);
3946 /* Allow debugging the jump pad, gdb_collect, etc.. */
3947 return (supports_fast_tracepoints ()
3948 && agent_loaded_p ()
3949 && (gdb_breakpoint_here (lwp
->stop_pc
)
3950 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3951 || thread
->last_resume_kind
== resume_step
)
3952 && (linux_fast_tracepoint_collecting (lwp
, NULL
)
3953 != fast_tpoint_collect_result::not_collecting
));
3957 linux_process_target::move_out_of_jump_pad (thread_info
*thread
)
3959 struct thread_info
*saved_thread
;
3960 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3963 if (lwp
->suspended
!= 0)
3965 internal_error (__FILE__
, __LINE__
,
3966 "LWP %ld is suspended, suspended=%d\n",
3967 lwpid_of (thread
), lwp
->suspended
);
3969 gdb_assert (lwp
->stopped
);
3971 /* For gdb_breakpoint_here. */
3972 saved_thread
= current_thread
;
3973 current_thread
= thread
;
3975 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
3977 /* Allow debugging the jump pad, gdb_collect, etc. */
3978 if (!gdb_breakpoint_here (lwp
->stop_pc
)
3979 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
3980 && thread
->last_resume_kind
!= resume_step
3981 && maybe_move_out_of_jump_pad (lwp
, wstat
))
3984 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
3989 lwp
->status_pending_p
= 0;
3990 enqueue_one_deferred_signal (lwp
, wstat
);
3993 debug_printf ("Signal %d for LWP %ld deferred "
3995 WSTOPSIG (*wstat
), lwpid_of (thread
));
3998 resume_one_lwp (lwp
, 0, 0, NULL
);
4001 lwp_suspended_inc (lwp
);
4003 current_thread
= saved_thread
;
4007 lwp_running (thread_info
*thread
)
4009 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4011 if (lwp_is_marked_dead (lwp
))
4014 return !lwp
->stopped
;
4018 linux_process_target::stop_all_lwps (int suspend
, lwp_info
*except
)
4020 /* Should not be called recursively. */
4021 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4026 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4027 suspend
? "stop-and-suspend" : "stop",
4029 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4033 stopping_threads
= (suspend
4034 ? STOPPING_AND_SUSPENDING_THREADS
4035 : STOPPING_THREADS
);
4038 for_each_thread ([&] (thread_info
*thread
)
4040 suspend_and_send_sigstop (thread
, except
);
4043 for_each_thread ([&] (thread_info
*thread
)
4045 send_sigstop (thread
, except
);
4048 wait_for_sigstop ();
4049 stopping_threads
= NOT_STOPPING_THREADS
;
4053 debug_printf ("stop_all_lwps done, setting stopping_threads "
4054 "back to !stopping\n");
4059 /* Enqueue one signal in the chain of signals which need to be
4060 delivered to this process on next resume. */
4063 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4065 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4067 p_sig
->prev
= lwp
->pending_signals
;
4068 p_sig
->signal
= signal
;
4070 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4072 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4073 lwp
->pending_signals
= p_sig
;
4077 linux_process_target::install_software_single_step_breakpoints (lwp_info
*lwp
)
4079 struct thread_info
*thread
= get_lwp_thread (lwp
);
4080 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4082 scoped_restore save_current_thread
= make_scoped_restore (¤t_thread
);
4084 current_thread
= thread
;
4085 std::vector
<CORE_ADDR
> next_pcs
= low_get_next_pcs (regcache
);
4087 for (CORE_ADDR pc
: next_pcs
)
4088 set_single_step_breakpoint (pc
, current_ptid
);
4092 linux_process_target::single_step (lwp_info
* lwp
)
4096 if (supports_hardware_single_step ())
4100 else if (supports_software_single_step ())
4102 install_software_single_step_breakpoints (lwp
);
4108 debug_printf ("stepping is not implemented on this target");
4114 /* The signal can be delivered to the inferior if we are not trying to
4115 finish a fast tracepoint collect. Since signal can be delivered in
4116 the step-over, the program may go to signal handler and trap again
4117 after return from the signal handler. We can live with the spurious
4121 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4123 return (lwp
->collecting_fast_tracepoint
4124 == fast_tpoint_collect_result::not_collecting
);
4128 linux_process_target::resume_one_lwp_throw (lwp_info
*lwp
, int step
,
4129 int signal
, siginfo_t
*info
)
4131 struct thread_info
*thread
= get_lwp_thread (lwp
);
4132 struct thread_info
*saved_thread
;
4134 struct process_info
*proc
= get_thread_process (thread
);
4136 /* Note that target description may not be initialised
4137 (proc->tdesc == NULL) at this point because the program hasn't
4138 stopped at the first instruction yet. It means GDBserver skips
4139 the extra traps from the wrapper program (see option --wrapper).
4140 Code in this function that requires register access should be
4141 guarded by proc->tdesc == NULL or something else. */
4143 if (lwp
->stopped
== 0)
4146 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4148 fast_tpoint_collect_result fast_tp_collecting
4149 = lwp
->collecting_fast_tracepoint
;
4151 gdb_assert (!stabilizing_threads
4152 || (fast_tp_collecting
4153 != fast_tpoint_collect_result::not_collecting
));
4155 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4156 user used the "jump" command, or "set $pc = foo"). */
4157 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4159 /* Collecting 'while-stepping' actions doesn't make sense
4161 release_while_stepping_state_list (thread
);
4164 /* If we have pending signals or status, and a new signal, enqueue the
4165 signal. Also enqueue the signal if it can't be delivered to the
4166 inferior right now. */
4168 && (lwp
->status_pending_p
4169 || lwp
->pending_signals
!= NULL
4170 || !lwp_signal_can_be_delivered (lwp
)))
4172 enqueue_pending_signal (lwp
, signal
, info
);
4174 /* Postpone any pending signal. It was enqueued above. */
4178 if (lwp
->status_pending_p
)
4181 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4182 " has pending status\n",
4183 lwpid_of (thread
), step
? "step" : "continue",
4184 lwp
->stop_expected
? "expected" : "not expected");
4188 saved_thread
= current_thread
;
4189 current_thread
= thread
;
4191 /* This bit needs some thinking about. If we get a signal that
4192 we must report while a single-step reinsert is still pending,
4193 we often end up resuming the thread. It might be better to
4194 (ew) allow a stack of pending events; then we could be sure that
4195 the reinsert happened right away and not lose any signals.
4197 Making this stack would also shrink the window in which breakpoints are
4198 uninserted (see comment in linux_wait_for_lwp) but not enough for
4199 complete correctness, so it won't solve that problem. It may be
4200 worthwhile just to solve this one, however. */
4201 if (lwp
->bp_reinsert
!= 0)
4204 debug_printf (" pending reinsert at 0x%s\n",
4205 paddress (lwp
->bp_reinsert
));
4207 if (supports_hardware_single_step ())
4209 if (fast_tp_collecting
== fast_tpoint_collect_result::not_collecting
)
4212 warning ("BAD - reinserting but not stepping.");
4214 warning ("BAD - reinserting and suspended(%d).",
4219 step
= maybe_hw_step (thread
);
4222 if (fast_tp_collecting
== fast_tpoint_collect_result::before_insn
)
4225 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4226 " (exit-jump-pad-bkpt)\n",
4229 else if (fast_tp_collecting
== fast_tpoint_collect_result::at_insn
)
4232 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4233 " single-stepping\n",
4236 if (supports_hardware_single_step ())
4240 internal_error (__FILE__
, __LINE__
,
4241 "moving out of jump pad single-stepping"
4242 " not implemented on this target");
4246 /* If we have while-stepping actions in this thread set it stepping.
4247 If we have a signal to deliver, it may or may not be set to
4248 SIG_IGN, we don't know. Assume so, and allow collecting
4249 while-stepping into a signal handler. A possible smart thing to
4250 do would be to set an internal breakpoint at the signal return
4251 address, continue, and carry on catching this while-stepping
4252 action only when that breakpoint is hit. A future
4254 if (thread
->while_stepping
!= NULL
)
4257 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4260 step
= single_step (lwp
);
4263 if (proc
->tdesc
!= NULL
&& low_supports_breakpoints ())
4265 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4267 lwp
->stop_pc
= low_get_pc (regcache
);
4271 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4272 (long) lwp
->stop_pc
);
4276 /* If we have pending signals, consume one if it can be delivered to
4278 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4280 struct pending_signals
**p_sig
;
4282 p_sig
= &lwp
->pending_signals
;
4283 while ((*p_sig
)->prev
!= NULL
)
4284 p_sig
= &(*p_sig
)->prev
;
4286 signal
= (*p_sig
)->signal
;
4287 if ((*p_sig
)->info
.si_signo
!= 0)
4288 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4296 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4297 lwpid_of (thread
), step
? "step" : "continue", signal
,
4298 lwp
->stop_expected
? "expected" : "not expected");
4300 low_prepare_to_resume (lwp
);
4302 regcache_invalidate_thread (thread
);
4304 lwp
->stepping
= step
;
4306 ptrace_request
= PTRACE_SINGLESTEP
;
4307 else if (gdb_catching_syscalls_p (lwp
))
4308 ptrace_request
= PTRACE_SYSCALL
;
4310 ptrace_request
= PTRACE_CONT
;
4311 ptrace (ptrace_request
,
4313 (PTRACE_TYPE_ARG3
) 0,
4314 /* Coerce to a uintptr_t first to avoid potential gcc warning
4315 of coercing an 8 byte integer to a 4 byte pointer. */
4316 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4318 current_thread
= saved_thread
;
4320 perror_with_name ("resuming thread");
4322 /* Successfully resumed. Clear state that no longer makes sense,
4323 and mark the LWP as running. Must not do this before resuming
4324 otherwise if that fails other code will be confused. E.g., we'd
4325 later try to stop the LWP and hang forever waiting for a stop
4326 status. Note that we must not throw after this is cleared,
4327 otherwise handle_zombie_lwp_error would get confused. */
4329 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4333 linux_process_target::low_prepare_to_resume (lwp_info
*lwp
)
4338 /* Called when we try to resume a stopped LWP and that errors out. If
4339 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4340 or about to become), discard the error, clear any pending status
4341 the LWP may have, and return true (we'll collect the exit status
4342 soon enough). Otherwise, return false. */
4345 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4347 struct thread_info
*thread
= get_lwp_thread (lp
);
4349 /* If we get an error after resuming the LWP successfully, we'd
4350 confuse !T state for the LWP being gone. */
4351 gdb_assert (lp
->stopped
);
4353 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4354 because even if ptrace failed with ESRCH, the tracee may be "not
4355 yet fully dead", but already refusing ptrace requests. In that
4356 case the tracee has 'R (Running)' state for a little bit
4357 (observed in Linux 3.18). See also the note on ESRCH in the
4358 ptrace(2) man page. Instead, check whether the LWP has any state
4359 other than ptrace-stopped. */
4361 /* Don't assume anything if /proc/PID/status can't be read. */
4362 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4364 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4365 lp
->status_pending_p
= 0;
4372 linux_process_target::resume_one_lwp (lwp_info
*lwp
, int step
, int signal
,
4377 resume_one_lwp_throw (lwp
, step
, signal
, info
);
4379 catch (const gdb_exception_error
&ex
)
4381 if (!check_ptrace_stopped_lwp_gone (lwp
))
4386 /* This function is called once per thread via for_each_thread.
4387 We look up which resume request applies to THREAD and mark it with a
4388 pointer to the appropriate resume request.
4390 This algorithm is O(threads * resume elements), but resume elements
4391 is small (and will remain small at least until GDB supports thread
4395 linux_set_resume_request (thread_info
*thread
, thread_resume
*resume
, size_t n
)
4397 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4399 for (int ndx
= 0; ndx
< n
; ndx
++)
4401 ptid_t ptid
= resume
[ndx
].thread
;
4402 if (ptid
== minus_one_ptid
4403 || ptid
== thread
->id
4404 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4406 || (ptid
.pid () == pid_of (thread
)
4408 || ptid
.lwp () == -1)))
4410 if (resume
[ndx
].kind
== resume_stop
4411 && thread
->last_resume_kind
== resume_stop
)
4414 debug_printf ("already %s LWP %ld at GDB's request\n",
4415 (thread
->last_status
.kind
4416 == TARGET_WAITKIND_STOPPED
)
4424 /* Ignore (wildcard) resume requests for already-resumed
4426 if (resume
[ndx
].kind
!= resume_stop
4427 && thread
->last_resume_kind
!= resume_stop
)
4430 debug_printf ("already %s LWP %ld at GDB's request\n",
4431 (thread
->last_resume_kind
4439 /* Don't let wildcard resumes resume fork children that GDB
4440 does not yet know are new fork children. */
4441 if (lwp
->fork_relative
!= NULL
)
4443 struct lwp_info
*rel
= lwp
->fork_relative
;
4445 if (rel
->status_pending_p
4446 && (rel
->waitstatus
.kind
== TARGET_WAITKIND_FORKED
4447 || rel
->waitstatus
.kind
== TARGET_WAITKIND_VFORKED
))
4450 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4456 /* If the thread has a pending event that has already been
4457 reported to GDBserver core, but GDB has not pulled the
4458 event out of the vStopped queue yet, likewise, ignore the
4459 (wildcard) resume request. */
4460 if (in_queued_stop_replies (thread
->id
))
4463 debug_printf ("not resuming LWP %ld: has queued stop reply\n",
4468 lwp
->resume
= &resume
[ndx
];
4469 thread
->last_resume_kind
= lwp
->resume
->kind
;
4471 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4472 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4474 /* If we had a deferred signal to report, dequeue one now.
4475 This can happen if LWP gets more than one signal while
4476 trying to get out of a jump pad. */
4478 && !lwp
->status_pending_p
4479 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4481 lwp
->status_pending_p
= 1;
4484 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4485 "leaving status pending.\n",
4486 WSTOPSIG (lwp
->status_pending
),
4494 /* No resume action for this thread. */
4499 linux_process_target::resume_status_pending (thread_info
*thread
)
4501 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4503 /* LWPs which will not be resumed are not interesting, because
4504 we might not wait for them next time through linux_wait. */
4505 if (lwp
->resume
== NULL
)
4508 return thread_still_has_status_pending (thread
);
4512 linux_process_target::thread_needs_step_over (thread_info
*thread
)
4514 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4515 struct thread_info
*saved_thread
;
4517 struct process_info
*proc
= get_thread_process (thread
);
4519 /* GDBserver is skipping the extra traps from the wrapper program,
4520 don't have to do step over. */
4521 if (proc
->tdesc
== NULL
)
4524 /* LWPs which will not be resumed are not interesting, because we
4525 might not wait for them next time through linux_wait. */
4530 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4535 if (thread
->last_resume_kind
== resume_stop
)
4538 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4544 gdb_assert (lwp
->suspended
>= 0);
4549 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4554 if (lwp
->status_pending_p
)
4557 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4563 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4567 /* If the PC has changed since we stopped, then don't do anything,
4568 and let the breakpoint/tracepoint be hit. This happens if, for
4569 instance, GDB handled the decr_pc_after_break subtraction itself,
4570 GDB is OOL stepping this thread, or the user has issued a "jump"
4571 command, or poked thread's registers herself. */
4572 if (pc
!= lwp
->stop_pc
)
4575 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4576 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4578 paddress (lwp
->stop_pc
), paddress (pc
));
4582 /* On software single step target, resume the inferior with signal
4583 rather than stepping over. */
4584 if (supports_software_single_step ()
4585 && lwp
->pending_signals
!= NULL
4586 && lwp_signal_can_be_delivered (lwp
))
4589 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4596 saved_thread
= current_thread
;
4597 current_thread
= thread
;
4599 /* We can only step over breakpoints we know about. */
4600 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4602 /* Don't step over a breakpoint that GDB expects to hit
4603 though. If the condition is being evaluated on the target's side
4604 and it evaluate to false, step over this breakpoint as well. */
4605 if (gdb_breakpoint_here (pc
)
4606 && gdb_condition_true_at_breakpoint (pc
)
4607 && gdb_no_commands_at_breakpoint (pc
))
4610 debug_printf ("Need step over [LWP %ld]? yes, but found"
4611 " GDB breakpoint at 0x%s; skipping step over\n",
4612 lwpid_of (thread
), paddress (pc
));
4614 current_thread
= saved_thread
;
4620 debug_printf ("Need step over [LWP %ld]? yes, "
4621 "found breakpoint at 0x%s\n",
4622 lwpid_of (thread
), paddress (pc
));
4624 /* We've found an lwp that needs stepping over --- return 1 so
4625 that find_thread stops looking. */
4626 current_thread
= saved_thread
;
4632 current_thread
= saved_thread
;
4635 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4637 lwpid_of (thread
), paddress (pc
));
4643 linux_process_target::start_step_over (lwp_info
*lwp
)
4645 struct thread_info
*thread
= get_lwp_thread (lwp
);
4646 struct thread_info
*saved_thread
;
4651 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4654 stop_all_lwps (1, lwp
);
4656 if (lwp
->suspended
!= 0)
4658 internal_error (__FILE__
, __LINE__
,
4659 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4664 debug_printf ("Done stopping all threads for step-over.\n");
4666 /* Note, we should always reach here with an already adjusted PC,
4667 either by GDB (if we're resuming due to GDB's request), or by our
4668 caller, if we just finished handling an internal breakpoint GDB
4669 shouldn't care about. */
4672 saved_thread
= current_thread
;
4673 current_thread
= thread
;
4675 lwp
->bp_reinsert
= pc
;
4676 uninsert_breakpoints_at (pc
);
4677 uninsert_fast_tracepoint_jumps_at (pc
);
4679 step
= single_step (lwp
);
4681 current_thread
= saved_thread
;
4683 resume_one_lwp (lwp
, step
, 0, NULL
);
4685 /* Require next event from this LWP. */
4686 step_over_bkpt
= thread
->id
;
4690 linux_process_target::finish_step_over (lwp_info
*lwp
)
4692 if (lwp
->bp_reinsert
!= 0)
4694 struct thread_info
*saved_thread
= current_thread
;
4697 debug_printf ("Finished step over.\n");
4699 current_thread
= get_lwp_thread (lwp
);
4701 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4702 may be no breakpoint to reinsert there by now. */
4703 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4704 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4706 lwp
->bp_reinsert
= 0;
4708 /* Delete any single-step breakpoints. No longer needed. We
4709 don't have to worry about other threads hitting this trap,
4710 and later not being able to explain it, because we were
4711 stepping over a breakpoint, and we hold all threads but
4712 LWP stopped while doing that. */
4713 if (!supports_hardware_single_step ())
4715 gdb_assert (has_single_step_breakpoints (current_thread
));
4716 delete_single_step_breakpoints (current_thread
);
4719 step_over_bkpt
= null_ptid
;
4720 current_thread
= saved_thread
;
4728 linux_process_target::complete_ongoing_step_over ()
4730 if (step_over_bkpt
!= null_ptid
)
4732 struct lwp_info
*lwp
;
4737 debug_printf ("detach: step over in progress, finish it first\n");
4739 /* Passing NULL_PTID as filter indicates we want all events to
4740 be left pending. Eventually this returns when there are no
4741 unwaited-for children left. */
4742 ret
= wait_for_event_filtered (minus_one_ptid
, null_ptid
, &wstat
,
4744 gdb_assert (ret
== -1);
4746 lwp
= find_lwp_pid (step_over_bkpt
);
4748 finish_step_over (lwp
);
4749 step_over_bkpt
= null_ptid
;
4750 unsuspend_all_lwps (lwp
);
4755 linux_process_target::resume_one_thread (thread_info
*thread
,
4756 bool leave_all_stopped
)
4758 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4761 if (lwp
->resume
== NULL
)
4764 if (lwp
->resume
->kind
== resume_stop
)
4767 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4772 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
4774 /* Stop the thread, and wait for the event asynchronously,
4775 through the event loop. */
4781 debug_printf ("already stopped LWP %ld\n",
4784 /* The LWP may have been stopped in an internal event that
4785 was not meant to be notified back to GDB (e.g., gdbserver
4786 breakpoint), so we should be reporting a stop event in
4789 /* If the thread already has a pending SIGSTOP, this is a
4790 no-op. Otherwise, something later will presumably resume
4791 the thread and this will cause it to cancel any pending
4792 operation, due to last_resume_kind == resume_stop. If
4793 the thread already has a pending status to report, we
4794 will still report it the next time we wait - see
4795 status_pending_p_callback. */
4797 /* If we already have a pending signal to report, then
4798 there's no need to queue a SIGSTOP, as this means we're
4799 midway through moving the LWP out of the jumppad, and we
4800 will report the pending signal as soon as that is
4802 if (lwp
->pending_signals_to_report
== NULL
)
4806 /* For stop requests, we're done. */
4808 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4812 /* If this thread which is about to be resumed has a pending status,
4813 then don't resume it - we can just report the pending status.
4814 Likewise if it is suspended, because e.g., another thread is
4815 stepping past a breakpoint. Make sure to queue any signals that
4816 would otherwise be sent. In all-stop mode, we do this decision
4817 based on if *any* thread has a pending status. If there's a
4818 thread that needs the step-over-breakpoint dance, then don't
4819 resume any other thread but that particular one. */
4820 leave_pending
= (lwp
->suspended
4821 || lwp
->status_pending_p
4822 || leave_all_stopped
);
4824 /* If we have a new signal, enqueue the signal. */
4825 if (lwp
->resume
->sig
!= 0)
4827 siginfo_t info
, *info_p
;
4829 /* If this is the same signal we were previously stopped by,
4830 make sure to queue its siginfo. */
4831 if (WIFSTOPPED (lwp
->last_status
)
4832 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
4833 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
),
4834 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
4839 enqueue_pending_signal (lwp
, lwp
->resume
->sig
, info_p
);
4845 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
4847 proceed_one_lwp (thread
, NULL
);
4852 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
4855 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4860 linux_process_target::resume (thread_resume
*resume_info
, size_t n
)
4862 struct thread_info
*need_step_over
= NULL
;
4867 debug_printf ("linux_resume:\n");
4870 for_each_thread ([&] (thread_info
*thread
)
4872 linux_set_resume_request (thread
, resume_info
, n
);
4875 /* If there is a thread which would otherwise be resumed, which has
4876 a pending status, then don't resume any threads - we can just
4877 report the pending status. Make sure to queue any signals that
4878 would otherwise be sent. In non-stop mode, we'll apply this
4879 logic to each thread individually. We consume all pending events
4880 before considering to start a step-over (in all-stop). */
4881 bool any_pending
= false;
4883 any_pending
= find_thread ([this] (thread_info
*thread
)
4885 return resume_status_pending (thread
);
4888 /* If there is a thread which would otherwise be resumed, which is
4889 stopped at a breakpoint that needs stepping over, then don't
4890 resume any threads - have it step over the breakpoint with all
4891 other threads stopped, then resume all threads again. Make sure
4892 to queue any signals that would otherwise be delivered or
4894 if (!any_pending
&& low_supports_breakpoints ())
4895 need_step_over
= find_thread ([this] (thread_info
*thread
)
4897 return thread_needs_step_over (thread
);
4900 bool leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
4904 if (need_step_over
!= NULL
)
4905 debug_printf ("Not resuming all, need step over\n");
4906 else if (any_pending
)
4907 debug_printf ("Not resuming, all-stop and found "
4908 "an LWP with pending status\n");
4910 debug_printf ("Resuming, no pending status or step over needed\n");
4913 /* Even if we're leaving threads stopped, queue all signals we'd
4914 otherwise deliver. */
4915 for_each_thread ([&] (thread_info
*thread
)
4917 resume_one_thread (thread
, leave_all_stopped
);
4921 start_step_over (get_thread_lwp (need_step_over
));
4925 debug_printf ("linux_resume done\n");
4929 /* We may have events that were pending that can/should be sent to
4930 the client now. Trigger a linux_wait call. */
4931 if (target_is_async_p ())
4936 linux_process_target::proceed_one_lwp (thread_info
*thread
, lwp_info
*except
)
4938 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4945 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
4950 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
4954 if (thread
->last_resume_kind
== resume_stop
4955 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
4958 debug_printf (" client wants LWP to remain %ld stopped\n",
4963 if (lwp
->status_pending_p
)
4966 debug_printf (" LWP %ld has pending status, leaving stopped\n",
4971 gdb_assert (lwp
->suspended
>= 0);
4976 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
4980 if (thread
->last_resume_kind
== resume_stop
4981 && lwp
->pending_signals_to_report
== NULL
4982 && (lwp
->collecting_fast_tracepoint
4983 == fast_tpoint_collect_result::not_collecting
))
4985 /* We haven't reported this LWP as stopped yet (otherwise, the
4986 last_status.kind check above would catch it, and we wouldn't
4987 reach here. This LWP may have been momentarily paused by a
4988 stop_all_lwps call while handling for example, another LWP's
4989 step-over. In that case, the pending expected SIGSTOP signal
4990 that was queued at vCont;t handling time will have already
4991 been consumed by wait_for_sigstop, and so we need to requeue
4992 another one here. Note that if the LWP already has a SIGSTOP
4993 pending, this is a no-op. */
4996 debug_printf ("Client wants LWP %ld to stop. "
4997 "Making sure it has a SIGSTOP pending\n",
5003 if (thread
->last_resume_kind
== resume_step
)
5006 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5009 /* If resume_step is requested by GDB, install single-step
5010 breakpoints when the thread is about to be actually resumed if
5011 the single-step breakpoints weren't removed. */
5012 if (supports_software_single_step ()
5013 && !has_single_step_breakpoints (thread
))
5014 install_software_single_step_breakpoints (lwp
);
5016 step
= maybe_hw_step (thread
);
5018 else if (lwp
->bp_reinsert
!= 0)
5021 debug_printf (" stepping LWP %ld, reinsert set\n",
5024 step
= maybe_hw_step (thread
);
5029 resume_one_lwp (lwp
, step
, 0, NULL
);
5033 linux_process_target::unsuspend_and_proceed_one_lwp (thread_info
*thread
,
5036 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5041 lwp_suspended_decr (lwp
);
5043 proceed_one_lwp (thread
, except
);
5047 linux_process_target::proceed_all_lwps ()
5049 struct thread_info
*need_step_over
;
5051 /* If there is a thread which would otherwise be resumed, which is
5052 stopped at a breakpoint that needs stepping over, then don't
5053 resume any threads - have it step over the breakpoint with all
5054 other threads stopped, then resume all threads again. */
5056 if (low_supports_breakpoints ())
5058 need_step_over
= find_thread ([this] (thread_info
*thread
)
5060 return thread_needs_step_over (thread
);
5063 if (need_step_over
!= NULL
)
5066 debug_printf ("proceed_all_lwps: found "
5067 "thread %ld needing a step-over\n",
5068 lwpid_of (need_step_over
));
5070 start_step_over (get_thread_lwp (need_step_over
));
5076 debug_printf ("Proceeding, no step-over needed\n");
5078 for_each_thread ([this] (thread_info
*thread
)
5080 proceed_one_lwp (thread
, NULL
);
5085 linux_process_target::unstop_all_lwps (int unsuspend
, lwp_info
*except
)
5091 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5092 lwpid_of (get_lwp_thread (except
)));
5094 debug_printf ("unstopping all lwps\n");
5098 for_each_thread ([&] (thread_info
*thread
)
5100 unsuspend_and_proceed_one_lwp (thread
, except
);
5103 for_each_thread ([&] (thread_info
*thread
)
5105 proceed_one_lwp (thread
, except
);
5110 debug_printf ("unstop_all_lwps done\n");
5116 #ifdef HAVE_LINUX_REGSETS
5118 #define use_linux_regsets 1
5120 /* Returns true if REGSET has been disabled. */
5123 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5125 return (info
->disabled_regsets
!= NULL
5126 && info
->disabled_regsets
[regset
- info
->regsets
]);
5129 /* Disable REGSET. */
5132 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5136 dr_offset
= regset
- info
->regsets
;
5137 if (info
->disabled_regsets
== NULL
)
5138 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5139 info
->disabled_regsets
[dr_offset
] = 1;
5143 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5144 struct regcache
*regcache
)
5146 struct regset_info
*regset
;
5147 int saw_general_regs
= 0;
5151 pid
= lwpid_of (current_thread
);
5152 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5157 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5160 buf
= xmalloc (regset
->size
);
5162 nt_type
= regset
->nt_type
;
5166 iov
.iov_len
= regset
->size
;
5167 data
= (void *) &iov
;
5173 res
= ptrace (regset
->get_request
, pid
,
5174 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5176 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5181 || (errno
== EINVAL
&& regset
->type
== OPTIONAL_REGS
))
5183 /* If we get EIO on a regset, or an EINVAL and the regset is
5184 optional, do not try it again for this process mode. */
5185 disable_regset (regsets_info
, regset
);
5187 else if (errno
== ENODATA
)
5189 /* ENODATA may be returned if the regset is currently
5190 not "active". This can happen in normal operation,
5191 so suppress the warning in this case. */
5193 else if (errno
== ESRCH
)
5195 /* At this point, ESRCH should mean the process is
5196 already gone, in which case we simply ignore attempts
5197 to read its registers. */
5202 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5209 if (regset
->type
== GENERAL_REGS
)
5210 saw_general_regs
= 1;
5211 regset
->store_function (regcache
, buf
);
5215 if (saw_general_regs
)
5222 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5223 struct regcache
*regcache
)
5225 struct regset_info
*regset
;
5226 int saw_general_regs
= 0;
5230 pid
= lwpid_of (current_thread
);
5231 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5236 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5237 || regset
->fill_function
== NULL
)
5240 buf
= xmalloc (regset
->size
);
5242 /* First fill the buffer with the current register set contents,
5243 in case there are any items in the kernel's regset that are
5244 not in gdbserver's regcache. */
5246 nt_type
= regset
->nt_type
;
5250 iov
.iov_len
= regset
->size
;
5251 data
= (void *) &iov
;
5257 res
= ptrace (regset
->get_request
, pid
,
5258 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5260 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5265 /* Then overlay our cached registers on that. */
5266 regset
->fill_function (regcache
, buf
);
5268 /* Only now do we write the register set. */
5270 res
= ptrace (regset
->set_request
, pid
,
5271 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5273 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5280 || (errno
== EINVAL
&& regset
->type
== OPTIONAL_REGS
))
5282 /* If we get EIO on a regset, or an EINVAL and the regset is
5283 optional, do not try it again for this process mode. */
5284 disable_regset (regsets_info
, regset
);
5286 else if (errno
== ESRCH
)
5288 /* At this point, ESRCH should mean the process is
5289 already gone, in which case we simply ignore attempts
5290 to change its registers. See also the related
5291 comment in resume_one_lwp. */
5297 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5300 else if (regset
->type
== GENERAL_REGS
)
5301 saw_general_regs
= 1;
5304 if (saw_general_regs
)
5310 #else /* !HAVE_LINUX_REGSETS */
5312 #define use_linux_regsets 0
5313 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5314 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5318 /* Return 1 if register REGNO is supported by one of the regset ptrace
5319 calls or 0 if it has to be transferred individually. */
5322 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5324 unsigned char mask
= 1 << (regno
% 8);
5325 size_t index
= regno
/ 8;
5327 return (use_linux_regsets
5328 && (regs_info
->regset_bitmap
== NULL
5329 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5332 #ifdef HAVE_LINUX_USRREGS
5335 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5339 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5340 error ("Invalid register number %d.", regnum
);
5342 addr
= usrregs
->regmap
[regnum
];
5349 linux_process_target::fetch_register (const usrregs_info
*usrregs
,
5350 regcache
*regcache
, int regno
)
5357 if (regno
>= usrregs
->num_regs
)
5359 if (low_cannot_fetch_register (regno
))
5362 regaddr
= register_addr (usrregs
, regno
);
5366 size
= ((register_size (regcache
->tdesc
, regno
)
5367 + sizeof (PTRACE_XFER_TYPE
) - 1)
5368 & -sizeof (PTRACE_XFER_TYPE
));
5369 buf
= (char *) alloca (size
);
5371 pid
= lwpid_of (current_thread
);
5372 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5375 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5376 ptrace (PTRACE_PEEKUSER
, pid
,
5377 /* Coerce to a uintptr_t first to avoid potential gcc warning
5378 of coercing an 8 byte integer to a 4 byte pointer. */
5379 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5380 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5383 /* Mark register REGNO unavailable. */
5384 supply_register (regcache
, regno
, NULL
);
5389 low_supply_ptrace_register (regcache
, regno
, buf
);
5393 linux_process_target::store_register (const usrregs_info
*usrregs
,
5394 regcache
*regcache
, int regno
)
5401 if (regno
>= usrregs
->num_regs
)
5403 if (low_cannot_store_register (regno
))
5406 regaddr
= register_addr (usrregs
, regno
);
5410 size
= ((register_size (regcache
->tdesc
, regno
)
5411 + sizeof (PTRACE_XFER_TYPE
) - 1)
5412 & -sizeof (PTRACE_XFER_TYPE
));
5413 buf
= (char *) alloca (size
);
5414 memset (buf
, 0, size
);
5416 low_collect_ptrace_register (regcache
, regno
, buf
);
5418 pid
= lwpid_of (current_thread
);
5419 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5422 ptrace (PTRACE_POKEUSER
, pid
,
5423 /* Coerce to a uintptr_t first to avoid potential gcc warning
5424 about coercing an 8 byte integer to a 4 byte pointer. */
5425 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5426 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5429 /* At this point, ESRCH should mean the process is
5430 already gone, in which case we simply ignore attempts
5431 to change its registers. See also the related
5432 comment in resume_one_lwp. */
5437 if (!low_cannot_store_register (regno
))
5438 error ("writing register %d: %s", regno
, safe_strerror (errno
));
5440 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5443 #endif /* HAVE_LINUX_USRREGS */
5446 linux_process_target::low_collect_ptrace_register (regcache
*regcache
,
5447 int regno
, char *buf
)
5449 collect_register (regcache
, regno
, buf
);
5453 linux_process_target::low_supply_ptrace_register (regcache
*regcache
,
5454 int regno
, const char *buf
)
5456 supply_register (regcache
, regno
, buf
);
5460 linux_process_target::usr_fetch_inferior_registers (const regs_info
*regs_info
,
5464 #ifdef HAVE_LINUX_USRREGS
5465 struct usrregs_info
*usr
= regs_info
->usrregs
;
5469 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5470 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5471 fetch_register (usr
, regcache
, regno
);
5474 fetch_register (usr
, regcache
, regno
);
5479 linux_process_target::usr_store_inferior_registers (const regs_info
*regs_info
,
5483 #ifdef HAVE_LINUX_USRREGS
5484 struct usrregs_info
*usr
= regs_info
->usrregs
;
5488 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5489 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5490 store_register (usr
, regcache
, regno
);
5493 store_register (usr
, regcache
, regno
);
5498 linux_process_target::fetch_registers (regcache
*regcache
, int regno
)
5502 const regs_info
*regs_info
= get_regs_info ();
5506 if (regs_info
->usrregs
!= NULL
)
5507 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5508 low_fetch_register (regcache
, regno
);
5510 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5511 if (regs_info
->usrregs
!= NULL
)
5512 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5516 if (low_fetch_register (regcache
, regno
))
5519 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5521 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5523 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5524 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5529 linux_process_target::store_registers (regcache
*regcache
, int regno
)
5533 const regs_info
*regs_info
= get_regs_info ();
5537 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5539 if (regs_info
->usrregs
!= NULL
)
5540 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5544 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5546 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5548 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5549 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5554 linux_process_target::low_fetch_register (regcache
*regcache
, int regno
)
5559 /* A wrapper for the read_memory target op. */
5562 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5564 return the_target
->read_memory (memaddr
, myaddr
, len
);
5567 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5568 to debugger memory starting at MYADDR. */
5571 linux_process_target::read_memory (CORE_ADDR memaddr
,
5572 unsigned char *myaddr
, int len
)
5574 int pid
= lwpid_of (current_thread
);
5575 PTRACE_XFER_TYPE
*buffer
;
5583 /* Try using /proc. Don't bother for one word. */
5584 if (len
>= 3 * sizeof (long))
5588 /* We could keep this file open and cache it - possibly one per
5589 thread. That requires some juggling, but is even faster. */
5590 sprintf (filename
, "/proc/%d/mem", pid
);
5591 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5595 /* If pread64 is available, use it. It's faster if the kernel
5596 supports it (only one syscall), and it's 64-bit safe even on
5597 32-bit platforms (for instance, SPARC debugging a SPARC64
5600 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5603 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5604 bytes
= read (fd
, myaddr
, len
);
5611 /* Some data was read, we'll try to get the rest with ptrace. */
5621 /* Round starting address down to longword boundary. */
5622 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5623 /* Round ending address up; get number of longwords that makes. */
5624 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5625 / sizeof (PTRACE_XFER_TYPE
));
5626 /* Allocate buffer of that many longwords. */
5627 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5629 /* Read all the longwords */
5631 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5633 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5634 about coercing an 8 byte integer to a 4 byte pointer. */
5635 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5636 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5637 (PTRACE_TYPE_ARG4
) 0);
5643 /* Copy appropriate bytes out of the buffer. */
5646 i
*= sizeof (PTRACE_XFER_TYPE
);
5647 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5649 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5656 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5657 memory at MEMADDR. On failure (cannot write to the inferior)
5658 returns the value of errno. Always succeeds if LEN is zero. */
5661 linux_process_target::write_memory (CORE_ADDR memaddr
,
5662 const unsigned char *myaddr
, int len
)
5665 /* Round starting address down to longword boundary. */
5666 CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5667 /* Round ending address up; get number of longwords that makes. */
5669 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5670 / sizeof (PTRACE_XFER_TYPE
);
5672 /* Allocate buffer of that many longwords. */
5673 PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5675 int pid
= lwpid_of (current_thread
);
5679 /* Zero length write always succeeds. */
5685 /* Dump up to four bytes. */
5686 char str
[4 * 2 + 1];
5688 int dump
= len
< 4 ? len
: 4;
5690 for (i
= 0; i
< dump
; i
++)
5692 sprintf (p
, "%02x", myaddr
[i
]);
5697 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5698 str
, (long) memaddr
, pid
);
5701 /* Fill start and end extra bytes of buffer with existing memory data. */
5704 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5705 about coercing an 8 byte integer to a 4 byte pointer. */
5706 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5707 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5708 (PTRACE_TYPE_ARG4
) 0);
5716 = ptrace (PTRACE_PEEKTEXT
, pid
,
5717 /* Coerce to a uintptr_t first to avoid potential gcc warning
5718 about coercing an 8 byte integer to a 4 byte pointer. */
5719 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5720 * sizeof (PTRACE_XFER_TYPE
)),
5721 (PTRACE_TYPE_ARG4
) 0);
5726 /* Copy data to be written over corresponding part of buffer. */
5728 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5731 /* Write the entire buffer. */
5733 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5736 ptrace (PTRACE_POKETEXT
, pid
,
5737 /* Coerce to a uintptr_t first to avoid potential gcc warning
5738 about coercing an 8 byte integer to a 4 byte pointer. */
5739 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5740 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5749 linux_process_target::look_up_symbols ()
5751 #ifdef USE_THREAD_DB
5752 struct process_info
*proc
= current_process ();
5754 if (proc
->priv
->thread_db
!= NULL
)
5762 linux_process_target::request_interrupt ()
5764 /* Send a SIGINT to the process group. This acts just like the user
5765 typed a ^C on the controlling terminal. */
5766 ::kill (-signal_pid
, SIGINT
);
5770 linux_process_target::supports_read_auxv ()
5775 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5776 to debugger memory starting at MYADDR. */
5779 linux_process_target::read_auxv (CORE_ADDR offset
, unsigned char *myaddr
,
5782 char filename
[PATH_MAX
];
5784 int pid
= lwpid_of (current_thread
);
5786 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5788 fd
= open (filename
, O_RDONLY
);
5792 if (offset
!= (CORE_ADDR
) 0
5793 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5796 n
= read (fd
, myaddr
, len
);
5804 linux_process_target::insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5805 int size
, raw_breakpoint
*bp
)
5807 if (type
== raw_bkpt_type_sw
)
5808 return insert_memory_breakpoint (bp
);
5810 return low_insert_point (type
, addr
, size
, bp
);
5814 linux_process_target::low_insert_point (raw_bkpt_type type
, CORE_ADDR addr
,
5815 int size
, raw_breakpoint
*bp
)
5817 /* Unsupported (see target.h). */
5822 linux_process_target::remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5823 int size
, raw_breakpoint
*bp
)
5825 if (type
== raw_bkpt_type_sw
)
5826 return remove_memory_breakpoint (bp
);
5828 return low_remove_point (type
, addr
, size
, bp
);
5832 linux_process_target::low_remove_point (raw_bkpt_type type
, CORE_ADDR addr
,
5833 int size
, raw_breakpoint
*bp
)
5835 /* Unsupported (see target.h). */
5839 /* Implement the stopped_by_sw_breakpoint target_ops
5843 linux_process_target::stopped_by_sw_breakpoint ()
5845 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5847 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
5850 /* Implement the supports_stopped_by_sw_breakpoint target_ops
5854 linux_process_target::supports_stopped_by_sw_breakpoint ()
5856 return USE_SIGTRAP_SIGINFO
;
5859 /* Implement the stopped_by_hw_breakpoint target_ops
5863 linux_process_target::stopped_by_hw_breakpoint ()
5865 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5867 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
5870 /* Implement the supports_stopped_by_hw_breakpoint target_ops
5874 linux_process_target::supports_stopped_by_hw_breakpoint ()
5876 return USE_SIGTRAP_SIGINFO
;
5879 /* Implement the supports_hardware_single_step target_ops method. */
5882 linux_process_target::supports_hardware_single_step ()
5888 linux_process_target::stopped_by_watchpoint ()
5890 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5892 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
5896 linux_process_target::stopped_data_address ()
5898 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5900 return lwp
->stopped_data_address
;
5903 /* This is only used for targets that define PT_TEXT_ADDR,
5904 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
5905 the target has different ways of acquiring this information, like
5909 linux_process_target::supports_read_offsets ()
5911 #ifdef SUPPORTS_READ_OFFSETS
5918 /* Under uClinux, programs are loaded at non-zero offsets, which we need
5919 to tell gdb about. */
5922 linux_process_target::read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
5924 #ifdef SUPPORTS_READ_OFFSETS
5925 unsigned long text
, text_end
, data
;
5926 int pid
= lwpid_of (current_thread
);
5930 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
5931 (PTRACE_TYPE_ARG4
) 0);
5932 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
5933 (PTRACE_TYPE_ARG4
) 0);
5934 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
5935 (PTRACE_TYPE_ARG4
) 0);
5939 /* Both text and data offsets produced at compile-time (and so
5940 used by gdb) are relative to the beginning of the program,
5941 with the data segment immediately following the text segment.
5942 However, the actual runtime layout in memory may put the data
5943 somewhere else, so when we send gdb a data base-address, we
5944 use the real data base address and subtract the compile-time
5945 data base-address from it (which is just the length of the
5946 text segment). BSS immediately follows data in both
5949 *data_p
= data
- (text_end
- text
);
5955 gdb_assert_not_reached ("target op read_offsets not supported");
5960 linux_process_target::supports_get_tls_address ()
5962 #ifdef USE_THREAD_DB
5970 linux_process_target::get_tls_address (thread_info
*thread
,
5972 CORE_ADDR load_module
,
5975 #ifdef USE_THREAD_DB
5976 return thread_db_get_tls_address (thread
, offset
, load_module
, address
);
5983 linux_process_target::supports_qxfer_osdata ()
5989 linux_process_target::qxfer_osdata (const char *annex
,
5990 unsigned char *readbuf
,
5991 unsigned const char *writebuf
,
5992 CORE_ADDR offset
, int len
)
5994 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
5998 linux_process_target::siginfo_fixup (siginfo_t
*siginfo
,
5999 gdb_byte
*inf_siginfo
, int direction
)
6001 bool done
= low_siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6003 /* If there was no callback, or the callback didn't do anything,
6004 then just do a straight memcpy. */
6008 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6010 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6015 linux_process_target::low_siginfo_fixup (siginfo_t
*native
, gdb_byte
*inf
,
6022 linux_process_target::supports_qxfer_siginfo ()
6028 linux_process_target::qxfer_siginfo (const char *annex
,
6029 unsigned char *readbuf
,
6030 unsigned const char *writebuf
,
6031 CORE_ADDR offset
, int len
)
6035 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6037 if (current_thread
== NULL
)
6040 pid
= lwpid_of (current_thread
);
6043 debug_printf ("%s siginfo for lwp %d.\n",
6044 readbuf
!= NULL
? "Reading" : "Writing",
6047 if (offset
>= sizeof (siginfo
))
6050 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6053 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6054 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6055 inferior with a 64-bit GDBSERVER should look the same as debugging it
6056 with a 32-bit GDBSERVER, we need to convert it. */
6057 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6059 if (offset
+ len
> sizeof (siginfo
))
6060 len
= sizeof (siginfo
) - offset
;
6062 if (readbuf
!= NULL
)
6063 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6066 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6068 /* Convert back to ptrace layout before flushing it out. */
6069 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6071 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6078 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6079 so we notice when children change state; as the handler for the
6080 sigsuspend in my_waitpid. */
6083 sigchld_handler (int signo
)
6085 int old_errno
= errno
;
6091 /* Use the async signal safe debug function. */
6092 if (debug_write ("sigchld_handler\n",
6093 sizeof ("sigchld_handler\n") - 1) < 0)
6094 break; /* just ignore */
6098 if (target_is_async_p ())
6099 async_file_mark (); /* trigger a linux_wait */
6105 linux_process_target::supports_non_stop ()
6111 linux_process_target::async (bool enable
)
6113 bool previous
= target_is_async_p ();
6116 debug_printf ("linux_async (%d), previous=%d\n",
6119 if (previous
!= enable
)
6122 sigemptyset (&mask
);
6123 sigaddset (&mask
, SIGCHLD
);
6125 gdb_sigmask (SIG_BLOCK
, &mask
, NULL
);
6129 if (pipe (linux_event_pipe
) == -1)
6131 linux_event_pipe
[0] = -1;
6132 linux_event_pipe
[1] = -1;
6133 gdb_sigmask (SIG_UNBLOCK
, &mask
, NULL
);
6135 warning ("creating event pipe failed.");
6139 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6140 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6142 /* Register the event loop handler. */
6143 add_file_handler (linux_event_pipe
[0],
6144 handle_target_event
, NULL
);
6146 /* Always trigger a linux_wait. */
6151 delete_file_handler (linux_event_pipe
[0]);
6153 close (linux_event_pipe
[0]);
6154 close (linux_event_pipe
[1]);
6155 linux_event_pipe
[0] = -1;
6156 linux_event_pipe
[1] = -1;
6159 gdb_sigmask (SIG_UNBLOCK
, &mask
, NULL
);
6166 linux_process_target::start_non_stop (bool nonstop
)
6168 /* Register or unregister from event-loop accordingly. */
6169 target_async (nonstop
);
6171 if (target_is_async_p () != (nonstop
!= false))
6178 linux_process_target::supports_multi_process ()
6183 /* Check if fork events are supported. */
6186 linux_process_target::supports_fork_events ()
6188 return linux_supports_tracefork ();
6191 /* Check if vfork events are supported. */
6194 linux_process_target::supports_vfork_events ()
6196 return linux_supports_tracefork ();
6199 /* Check if exec events are supported. */
6202 linux_process_target::supports_exec_events ()
6204 return linux_supports_traceexec ();
6207 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6208 ptrace flags for all inferiors. This is in case the new GDB connection
6209 doesn't support the same set of events that the previous one did. */
6212 linux_process_target::handle_new_gdb_connection ()
6214 /* Request that all the lwps reset their ptrace options. */
6215 for_each_thread ([] (thread_info
*thread
)
6217 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6221 /* Stop the lwp so we can modify its ptrace options. */
6222 lwp
->must_set_ptrace_flags
= 1;
6223 linux_stop_lwp (lwp
);
6227 /* Already stopped; go ahead and set the ptrace options. */
6228 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6229 int options
= linux_low_ptrace_options (proc
->attached
);
6231 linux_enable_event_reporting (lwpid_of (thread
), options
);
6232 lwp
->must_set_ptrace_flags
= 0;
6238 linux_process_target::handle_monitor_command (char *mon
)
6240 #ifdef USE_THREAD_DB
6241 return thread_db_handle_monitor_command (mon
);
6248 linux_process_target::core_of_thread (ptid_t ptid
)
6250 return linux_common_core_of_thread (ptid
);
6254 linux_process_target::supports_disable_randomization ()
6256 #ifdef HAVE_PERSONALITY
6264 linux_process_target::supports_agent ()
6270 linux_process_target::supports_range_stepping ()
6272 if (supports_software_single_step ())
6275 return low_supports_range_stepping ();
6279 linux_process_target::low_supports_range_stepping ()
6285 linux_process_target::supports_pid_to_exec_file ()
6291 linux_process_target::pid_to_exec_file (int pid
)
6293 return linux_proc_pid_to_exec_file (pid
);
6297 linux_process_target::supports_multifs ()
6303 linux_process_target::multifs_open (int pid
, const char *filename
,
6304 int flags
, mode_t mode
)
6306 return linux_mntns_open_cloexec (pid
, filename
, flags
, mode
);
6310 linux_process_target::multifs_unlink (int pid
, const char *filename
)
6312 return linux_mntns_unlink (pid
, filename
);
6316 linux_process_target::multifs_readlink (int pid
, const char *filename
,
6317 char *buf
, size_t bufsiz
)
6319 return linux_mntns_readlink (pid
, filename
, buf
, bufsiz
);
6322 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6323 struct target_loadseg
6325 /* Core address to which the segment is mapped. */
6327 /* VMA recorded in the program header. */
6329 /* Size of this segment in memory. */
6333 # if defined PT_GETDSBT
6334 struct target_loadmap
6336 /* Protocol version number, must be zero. */
6338 /* Pointer to the DSBT table, its size, and the DSBT index. */
6339 unsigned *dsbt_table
;
6340 unsigned dsbt_size
, dsbt_index
;
6341 /* Number of segments in this map. */
6343 /* The actual memory map. */
6344 struct target_loadseg segs
[/*nsegs*/];
6346 # define LINUX_LOADMAP PT_GETDSBT
6347 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6348 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6350 struct target_loadmap
6352 /* Protocol version number, must be zero. */
6354 /* Number of segments in this map. */
6356 /* The actual memory map. */
6357 struct target_loadseg segs
[/*nsegs*/];
6359 # define LINUX_LOADMAP PTRACE_GETFDPIC
6360 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6361 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6365 linux_process_target::supports_read_loadmap ()
6371 linux_process_target::read_loadmap (const char *annex
, CORE_ADDR offset
,
6372 unsigned char *myaddr
, unsigned int len
)
6374 int pid
= lwpid_of (current_thread
);
6376 struct target_loadmap
*data
= NULL
;
6377 unsigned int actual_length
, copy_length
;
6379 if (strcmp (annex
, "exec") == 0)
6380 addr
= (int) LINUX_LOADMAP_EXEC
;
6381 else if (strcmp (annex
, "interp") == 0)
6382 addr
= (int) LINUX_LOADMAP_INTERP
;
6386 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6392 actual_length
= sizeof (struct target_loadmap
)
6393 + sizeof (struct target_loadseg
) * data
->nsegs
;
6395 if (offset
< 0 || offset
> actual_length
)
6398 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6399 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6402 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6405 linux_process_target::supports_catch_syscall ()
6407 return (the_low_target
.get_syscall_trapinfo
!= NULL
6408 && linux_supports_tracesysgood ());
6412 linux_process_target::get_ipa_tdesc_idx ()
6414 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6417 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6421 linux_process_target::read_pc (regcache
*regcache
)
6423 if (!low_supports_breakpoints ())
6426 return low_get_pc (regcache
);
6430 linux_process_target::write_pc (regcache
*regcache
, CORE_ADDR pc
)
6432 gdb_assert (low_supports_breakpoints ());
6434 low_set_pc (regcache
, pc
);
6438 linux_process_target::supports_thread_stopped ()
6444 linux_process_target::thread_stopped (thread_info
*thread
)
6446 return get_thread_lwp (thread
)->stopped
;
6449 /* This exposes stop-all-threads functionality to other modules. */
6452 linux_process_target::pause_all (bool freeze
)
6454 stop_all_lwps (freeze
, NULL
);
6457 /* This exposes unstop-all-threads functionality to other gdbserver
6461 linux_process_target::unpause_all (bool unfreeze
)
6463 unstop_all_lwps (unfreeze
, NULL
);
6467 linux_process_target::prepare_to_access_memory ()
6469 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6472 target_pause_all (true);
6477 linux_process_target::done_accessing_memory ()
6479 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6482 target_unpause_all (true);
6485 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6488 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6489 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6491 char filename
[PATH_MAX
];
6493 const int auxv_size
= is_elf64
6494 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6495 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6497 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6499 fd
= open (filename
, O_RDONLY
);
6505 while (read (fd
, buf
, auxv_size
) == auxv_size
6506 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6510 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6512 switch (aux
->a_type
)
6515 *phdr_memaddr
= aux
->a_un
.a_val
;
6518 *num_phdr
= aux
->a_un
.a_val
;
6524 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6526 switch (aux
->a_type
)
6529 *phdr_memaddr
= aux
->a_un
.a_val
;
6532 *num_phdr
= aux
->a_un
.a_val
;
6540 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6542 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6543 "phdr_memaddr = %ld, phdr_num = %d",
6544 (long) *phdr_memaddr
, *num_phdr
);
6551 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6554 get_dynamic (const int pid
, const int is_elf64
)
6556 CORE_ADDR phdr_memaddr
, relocation
;
6558 unsigned char *phdr_buf
;
6559 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6561 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6564 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6565 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6567 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6570 /* Compute relocation: it is expected to be 0 for "regular" executables,
6571 non-zero for PIE ones. */
6573 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6576 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6578 if (p
->p_type
== PT_PHDR
)
6579 relocation
= phdr_memaddr
- p
->p_vaddr
;
6583 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6585 if (p
->p_type
== PT_PHDR
)
6586 relocation
= phdr_memaddr
- p
->p_vaddr
;
6589 if (relocation
== -1)
6591 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6592 any real world executables, including PIE executables, have always
6593 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6594 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6595 or present DT_DEBUG anyway (fpc binaries are statically linked).
6597 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6599 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6604 for (i
= 0; i
< num_phdr
; i
++)
6608 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6610 if (p
->p_type
== PT_DYNAMIC
)
6611 return p
->p_vaddr
+ relocation
;
6615 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6617 if (p
->p_type
== PT_DYNAMIC
)
6618 return p
->p_vaddr
+ relocation
;
6625 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6626 can be 0 if the inferior does not yet have the library list initialized.
6627 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6628 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6631 get_r_debug (const int pid
, const int is_elf64
)
6633 CORE_ADDR dynamic_memaddr
;
6634 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6635 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6638 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6639 if (dynamic_memaddr
== 0)
6642 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6646 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6647 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6651 unsigned char buf
[sizeof (Elf64_Xword
)];
6655 #ifdef DT_MIPS_RLD_MAP
6656 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6658 if (linux_read_memory (dyn
->d_un
.d_val
,
6659 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6664 #endif /* DT_MIPS_RLD_MAP */
6665 #ifdef DT_MIPS_RLD_MAP_REL
6666 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6668 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6669 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6674 #endif /* DT_MIPS_RLD_MAP_REL */
6676 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6677 map
= dyn
->d_un
.d_val
;
6679 if (dyn
->d_tag
== DT_NULL
)
6684 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6685 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6689 unsigned char buf
[sizeof (Elf32_Word
)];
6693 #ifdef DT_MIPS_RLD_MAP
6694 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6696 if (linux_read_memory (dyn
->d_un
.d_val
,
6697 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6702 #endif /* DT_MIPS_RLD_MAP */
6703 #ifdef DT_MIPS_RLD_MAP_REL
6704 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6706 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6707 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6712 #endif /* DT_MIPS_RLD_MAP_REL */
6714 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6715 map
= dyn
->d_un
.d_val
;
6717 if (dyn
->d_tag
== DT_NULL
)
6721 dynamic_memaddr
+= dyn_size
;
6727 /* Read one pointer from MEMADDR in the inferior. */
6730 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6734 /* Go through a union so this works on either big or little endian
6735 hosts, when the inferior's pointer size is smaller than the size
6736 of CORE_ADDR. It is assumed the inferior's endianness is the
6737 same of the superior's. */
6740 CORE_ADDR core_addr
;
6745 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6748 if (ptr_size
== sizeof (CORE_ADDR
))
6749 *ptr
= addr
.core_addr
;
6750 else if (ptr_size
== sizeof (unsigned int))
6753 gdb_assert_not_reached ("unhandled pointer size");
6759 linux_process_target::supports_qxfer_libraries_svr4 ()
6764 struct link_map_offsets
6766 /* Offset and size of r_debug.r_version. */
6767 int r_version_offset
;
6769 /* Offset and size of r_debug.r_map. */
6772 /* Offset to l_addr field in struct link_map. */
6775 /* Offset to l_name field in struct link_map. */
6778 /* Offset to l_ld field in struct link_map. */
6781 /* Offset to l_next field in struct link_map. */
6784 /* Offset to l_prev field in struct link_map. */
6788 /* Construct qXfer:libraries-svr4:read reply. */
6791 linux_process_target::qxfer_libraries_svr4 (const char *annex
,
6792 unsigned char *readbuf
,
6793 unsigned const char *writebuf
,
6794 CORE_ADDR offset
, int len
)
6796 struct process_info_private
*const priv
= current_process ()->priv
;
6797 char filename
[PATH_MAX
];
6800 static const struct link_map_offsets lmo_32bit_offsets
=
6802 0, /* r_version offset. */
6803 4, /* r_debug.r_map offset. */
6804 0, /* l_addr offset in link_map. */
6805 4, /* l_name offset in link_map. */
6806 8, /* l_ld offset in link_map. */
6807 12, /* l_next offset in link_map. */
6808 16 /* l_prev offset in link_map. */
6811 static const struct link_map_offsets lmo_64bit_offsets
=
6813 0, /* r_version offset. */
6814 8, /* r_debug.r_map offset. */
6815 0, /* l_addr offset in link_map. */
6816 8, /* l_name offset in link_map. */
6817 16, /* l_ld offset in link_map. */
6818 24, /* l_next offset in link_map. */
6819 32 /* l_prev offset in link_map. */
6821 const struct link_map_offsets
*lmo
;
6822 unsigned int machine
;
6824 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
6825 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
6826 int header_done
= 0;
6828 if (writebuf
!= NULL
)
6830 if (readbuf
== NULL
)
6833 pid
= lwpid_of (current_thread
);
6834 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
6835 is_elf64
= elf_64_file_p (filename
, &machine
);
6836 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
6837 ptr_size
= is_elf64
? 8 : 4;
6839 while (annex
[0] != '\0')
6845 sep
= strchr (annex
, '=');
6849 name_len
= sep
- annex
;
6850 if (name_len
== 5 && startswith (annex
, "start"))
6852 else if (name_len
== 4 && startswith (annex
, "prev"))
6856 annex
= strchr (sep
, ';');
6863 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
6870 if (priv
->r_debug
== 0)
6871 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
6873 /* We failed to find DT_DEBUG. Such situation will not change
6874 for this inferior - do not retry it. Report it to GDB as
6875 E01, see for the reasons at the GDB solib-svr4.c side. */
6876 if (priv
->r_debug
== (CORE_ADDR
) -1)
6879 if (priv
->r_debug
!= 0)
6881 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
6882 (unsigned char *) &r_version
,
6883 sizeof (r_version
)) != 0
6886 warning ("unexpected r_debug version %d", r_version
);
6888 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
6889 &lm_addr
, ptr_size
) != 0)
6891 warning ("unable to read r_map from 0x%lx",
6892 (long) priv
->r_debug
+ lmo
->r_map_offset
);
6897 std::string document
= "<library-list-svr4 version=\"1.0\"";
6900 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
6901 &l_name
, ptr_size
) == 0
6902 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
6903 &l_addr
, ptr_size
) == 0
6904 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
6905 &l_ld
, ptr_size
) == 0
6906 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
6907 &l_prev
, ptr_size
) == 0
6908 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
6909 &l_next
, ptr_size
) == 0)
6911 unsigned char libname
[PATH_MAX
];
6913 if (lm_prev
!= l_prev
)
6915 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
6916 (long) lm_prev
, (long) l_prev
);
6920 /* Ignore the first entry even if it has valid name as the first entry
6921 corresponds to the main executable. The first entry should not be
6922 skipped if the dynamic loader was loaded late by a static executable
6923 (see solib-svr4.c parameter ignore_first). But in such case the main
6924 executable does not have PT_DYNAMIC present and this function already
6925 exited above due to failed get_r_debug. */
6927 string_appendf (document
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
6930 /* Not checking for error because reading may stop before
6931 we've got PATH_MAX worth of characters. */
6933 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
6934 libname
[sizeof (libname
) - 1] = '\0';
6935 if (libname
[0] != '\0')
6939 /* Terminate `<library-list-svr4'. */
6944 string_appendf (document
, "<library name=\"");
6945 xml_escape_text_append (&document
, (char *) libname
);
6946 string_appendf (document
, "\" lm=\"0x%lx\" "
6947 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
6948 (unsigned long) lm_addr
, (unsigned long) l_addr
,
6949 (unsigned long) l_ld
);
6959 /* Empty list; terminate `<library-list-svr4'. */
6963 document
+= "</library-list-svr4>";
6965 int document_len
= document
.length ();
6966 if (offset
< document_len
)
6967 document_len
-= offset
;
6970 if (len
> document_len
)
6973 memcpy (readbuf
, document
.data () + offset
, len
);
6978 #ifdef HAVE_LINUX_BTRACE
6980 btrace_target_info
*
6981 linux_process_target::enable_btrace (ptid_t ptid
,
6982 const btrace_config
*conf
)
6984 return linux_enable_btrace (ptid
, conf
);
6987 /* See to_disable_btrace target method. */
6990 linux_process_target::disable_btrace (btrace_target_info
*tinfo
)
6992 enum btrace_error err
;
6994 err
= linux_disable_btrace (tinfo
);
6995 return (err
== BTRACE_ERR_NONE
? 0 : -1);
6998 /* Encode an Intel Processor Trace configuration. */
7001 linux_low_encode_pt_config (struct buffer
*buffer
,
7002 const struct btrace_data_pt_config
*config
)
7004 buffer_grow_str (buffer
, "<pt-config>\n");
7006 switch (config
->cpu
.vendor
)
7009 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7010 "model=\"%u\" stepping=\"%u\"/>\n",
7011 config
->cpu
.family
, config
->cpu
.model
,
7012 config
->cpu
.stepping
);
7019 buffer_grow_str (buffer
, "</pt-config>\n");
7022 /* Encode a raw buffer. */
7025 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7031 /* We use hex encoding - see gdbsupport/rsp-low.h. */
7032 buffer_grow_str (buffer
, "<raw>\n");
7038 elem
[0] = tohex ((*data
>> 4) & 0xf);
7039 elem
[1] = tohex (*data
++ & 0xf);
7041 buffer_grow (buffer
, elem
, 2);
7044 buffer_grow_str (buffer
, "</raw>\n");
7047 /* See to_read_btrace target method. */
7050 linux_process_target::read_btrace (btrace_target_info
*tinfo
,
7052 enum btrace_read_type type
)
7054 struct btrace_data btrace
;
7055 enum btrace_error err
;
7057 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7058 if (err
!= BTRACE_ERR_NONE
)
7060 if (err
== BTRACE_ERR_OVERFLOW
)
7061 buffer_grow_str0 (buffer
, "E.Overflow.");
7063 buffer_grow_str0 (buffer
, "E.Generic Error.");
7068 switch (btrace
.format
)
7070 case BTRACE_FORMAT_NONE
:
7071 buffer_grow_str0 (buffer
, "E.No Trace.");
7074 case BTRACE_FORMAT_BTS
:
7075 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7076 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7078 for (const btrace_block
&block
: *btrace
.variant
.bts
.blocks
)
7079 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7080 paddress (block
.begin
), paddress (block
.end
));
7082 buffer_grow_str0 (buffer
, "</btrace>\n");
7085 case BTRACE_FORMAT_PT
:
7086 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7087 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7088 buffer_grow_str (buffer
, "<pt>\n");
7090 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7092 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7093 btrace
.variant
.pt
.size
);
7095 buffer_grow_str (buffer
, "</pt>\n");
7096 buffer_grow_str0 (buffer
, "</btrace>\n");
7100 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7107 /* See to_btrace_conf target method. */
7110 linux_process_target::read_btrace_conf (const btrace_target_info
*tinfo
,
7113 const struct btrace_config
*conf
;
7115 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7116 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7118 conf
= linux_btrace_conf (tinfo
);
7121 switch (conf
->format
)
7123 case BTRACE_FORMAT_NONE
:
7126 case BTRACE_FORMAT_BTS
:
7127 buffer_xml_printf (buffer
, "<bts");
7128 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7129 buffer_xml_printf (buffer
, " />\n");
7132 case BTRACE_FORMAT_PT
:
7133 buffer_xml_printf (buffer
, "<pt");
7134 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7135 buffer_xml_printf (buffer
, "/>\n");
7140 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7143 #endif /* HAVE_LINUX_BTRACE */
7145 /* See nat/linux-nat.h. */
7148 current_lwp_ptid (void)
7150 return ptid_of (current_thread
);
7154 linux_process_target::thread_name (ptid_t thread
)
7156 return linux_proc_tid_get_name (thread
);
7161 linux_process_target::thread_handle (ptid_t ptid
, gdb_byte
**handle
,
7164 return thread_db_thread_handle (ptid
, handle
, handle_len
);
7168 /* Default implementation of linux_target_ops method "set_pc" for
7169 32-bit pc register which is literally named "pc". */
7172 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7174 uint32_t newpc
= pc
;
7176 supply_register_by_name (regcache
, "pc", &newpc
);
7179 /* Default implementation of linux_target_ops method "get_pc" for
7180 32-bit pc register which is literally named "pc". */
7183 linux_get_pc_32bit (struct regcache
*regcache
)
7187 collect_register_by_name (regcache
, "pc", &pc
);
7189 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7193 /* Default implementation of linux_target_ops method "set_pc" for
7194 64-bit pc register which is literally named "pc". */
7197 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7199 uint64_t newpc
= pc
;
7201 supply_register_by_name (regcache
, "pc", &newpc
);
7204 /* Default implementation of linux_target_ops method "get_pc" for
7205 64-bit pc register which is literally named "pc". */
7208 linux_get_pc_64bit (struct regcache
*regcache
)
7212 collect_register_by_name (regcache
, "pc", &pc
);
7214 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7218 /* See linux-low.h. */
7221 linux_get_auxv (int wordsize
, CORE_ADDR match
, CORE_ADDR
*valp
)
7223 gdb_byte
*data
= (gdb_byte
*) alloca (2 * wordsize
);
7226 gdb_assert (wordsize
== 4 || wordsize
== 8);
7228 while (the_target
->read_auxv (offset
, data
, 2 * wordsize
) == 2 * wordsize
)
7232 uint32_t *data_p
= (uint32_t *) data
;
7233 if (data_p
[0] == match
)
7241 uint64_t *data_p
= (uint64_t *) data
;
7242 if (data_p
[0] == match
)
7249 offset
+= 2 * wordsize
;
7255 /* See linux-low.h. */
7258 linux_get_hwcap (int wordsize
)
7260 CORE_ADDR hwcap
= 0;
7261 linux_get_auxv (wordsize
, AT_HWCAP
, &hwcap
);
7265 /* See linux-low.h. */
7268 linux_get_hwcap2 (int wordsize
)
7270 CORE_ADDR hwcap2
= 0;
7271 linux_get_auxv (wordsize
, AT_HWCAP2
, &hwcap2
);
7275 #ifdef HAVE_LINUX_REGSETS
7277 initialize_regsets_info (struct regsets_info
*info
)
7279 for (info
->num_regsets
= 0;
7280 info
->regsets
[info
->num_regsets
].size
>= 0;
7281 info
->num_regsets
++)
7287 initialize_low (void)
7289 struct sigaction sigchld_action
;
7291 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7292 set_target_ops (the_linux_target
);
7294 linux_ptrace_init_warnings ();
7295 linux_proc_init_warnings ();
7297 sigchld_action
.sa_handler
= sigchld_handler
;
7298 sigemptyset (&sigchld_action
.sa_mask
);
7299 sigchld_action
.sa_flags
= SA_RESTART
;
7300 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7302 initialize_low_arch ();
7304 linux_check_ptrace_features ();