1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2016 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "linux-low.h"
21 #include "nat/linux-osdata.h"
26 #include "nat/linux-nat.h"
27 #include "nat/linux-waitpid.h"
29 #include "nat/gdb_ptrace.h"
30 #include "nat/linux-ptrace.h"
31 #include "nat/linux-procfs.h"
32 #include "nat/linux-personality.h"
34 #include <sys/ioctl.h>
37 #include <sys/syscall.h>
41 #include <sys/types.h>
46 #include "filestuff.h"
47 #include "tracepoint.h"
51 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
52 then ELFMAG0 will have been defined. If it didn't get included by
53 gdb_proc_service.h then including it will likely introduce a duplicate
54 definition of elf_fpregset_t. */
57 #include "nat/linux-namespaces.h"
60 #define SPUFS_MAGIC 0x23c9b64e
63 #ifdef HAVE_PERSONALITY
64 # include <sys/personality.h>
65 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
66 # define ADDR_NO_RANDOMIZE 0x0040000
74 /* Some targets did not define these ptrace constants from the start,
75 so gdbserver defines them locally here. In the future, these may
76 be removed after they are added to asm/ptrace.h. */
77 #if !(defined(PT_TEXT_ADDR) \
78 || defined(PT_DATA_ADDR) \
79 || defined(PT_TEXT_END_ADDR))
80 #if defined(__mcoldfire__)
81 /* These are still undefined in 3.10 kernels. */
82 #define PT_TEXT_ADDR 49*4
83 #define PT_DATA_ADDR 50*4
84 #define PT_TEXT_END_ADDR 51*4
85 /* BFIN already defines these since at least 2.6.32 kernels. */
87 #define PT_TEXT_ADDR 220
88 #define PT_TEXT_END_ADDR 224
89 #define PT_DATA_ADDR 228
90 /* These are still undefined in 3.10 kernels. */
91 #elif defined(__TMS320C6X__)
92 #define PT_TEXT_ADDR (0x10000*4)
93 #define PT_DATA_ADDR (0x10004*4)
94 #define PT_TEXT_END_ADDR (0x10008*4)
98 #ifdef HAVE_LINUX_BTRACE
99 # include "nat/linux-btrace.h"
100 # include "btrace-common.h"
103 #ifndef HAVE_ELF32_AUXV_T
104 /* Copied from glibc's elf.h. */
107 uint32_t a_type
; /* Entry type */
110 uint32_t a_val
; /* Integer value */
111 /* We use to have pointer elements added here. We cannot do that,
112 though, since it does not work when using 32-bit definitions
113 on 64-bit platforms and vice versa. */
118 #ifndef HAVE_ELF64_AUXV_T
119 /* Copied from glibc's elf.h. */
122 uint64_t a_type
; /* Entry type */
125 uint64_t a_val
; /* Integer value */
126 /* We use to have pointer elements added here. We cannot do that,
127 though, since it does not work when using 32-bit definitions
128 on 64-bit platforms and vice versa. */
133 /* Does the current host support PTRACE_GETREGSET? */
134 int have_ptrace_getregset
= -1;
138 /* See nat/linux-nat.h. */
141 ptid_of_lwp (struct lwp_info
*lwp
)
143 return ptid_of (get_lwp_thread (lwp
));
146 /* See nat/linux-nat.h. */
149 lwp_set_arch_private_info (struct lwp_info
*lwp
,
150 struct arch_lwp_info
*info
)
152 lwp
->arch_private
= info
;
155 /* See nat/linux-nat.h. */
157 struct arch_lwp_info
*
158 lwp_arch_private_info (struct lwp_info
*lwp
)
160 return lwp
->arch_private
;
163 /* See nat/linux-nat.h. */
166 lwp_is_stopped (struct lwp_info
*lwp
)
171 /* See nat/linux-nat.h. */
173 enum target_stop_reason
174 lwp_stop_reason (struct lwp_info
*lwp
)
176 return lwp
->stop_reason
;
179 /* A list of all unknown processes which receive stop signals. Some
180 other process will presumably claim each of these as forked
181 children momentarily. */
183 struct simple_pid_list
185 /* The process ID. */
188 /* The status as reported by waitpid. */
192 struct simple_pid_list
*next
;
194 struct simple_pid_list
*stopped_pids
;
196 /* Trivial list manipulation functions to keep track of a list of new
197 stopped processes. */
200 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
202 struct simple_pid_list
*new_pid
= XNEW (struct simple_pid_list
);
205 new_pid
->status
= status
;
206 new_pid
->next
= *listp
;
211 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
213 struct simple_pid_list
**p
;
215 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
216 if ((*p
)->pid
== pid
)
218 struct simple_pid_list
*next
= (*p
)->next
;
220 *statusp
= (*p
)->status
;
228 enum stopping_threads_kind
230 /* Not stopping threads presently. */
231 NOT_STOPPING_THREADS
,
233 /* Stopping threads. */
236 /* Stopping and suspending threads. */
237 STOPPING_AND_SUSPENDING_THREADS
240 /* This is set while stop_all_lwps is in effect. */
241 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
243 /* FIXME make into a target method? */
244 int using_threads
= 1;
246 /* True if we're presently stabilizing threads (moving them out of
248 static int stabilizing_threads
;
250 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
251 int step
, int signal
, siginfo_t
*info
);
252 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
253 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
254 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
255 static void unsuspend_all_lwps (struct lwp_info
*except
);
256 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
257 int *wstat
, int options
);
258 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
259 static struct lwp_info
*add_lwp (ptid_t ptid
);
260 static void linux_mourn (struct process_info
*process
);
261 static int linux_stopped_by_watchpoint (void);
262 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
263 static int lwp_is_marked_dead (struct lwp_info
*lwp
);
264 static void proceed_all_lwps (void);
265 static int finish_step_over (struct lwp_info
*lwp
);
266 static int kill_lwp (unsigned long lwpid
, int signo
);
267 static void enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
);
268 static void complete_ongoing_step_over (void);
269 static int linux_low_ptrace_options (int attached
);
270 static int check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
);
272 /* When the event-loop is doing a step-over, this points at the thread
274 ptid_t step_over_bkpt
;
276 /* True if the low target can hardware single-step. */
279 can_hardware_single_step (void)
281 if (the_low_target
.supports_hardware_single_step
!= NULL
)
282 return the_low_target
.supports_hardware_single_step ();
287 /* True if the low target can software single-step. Such targets
288 implement the GET_NEXT_PCS callback. */
291 can_software_single_step (void)
293 return (the_low_target
.get_next_pcs
!= NULL
);
296 /* True if the low target supports memory breakpoints. If so, we'll
297 have a GET_PC implementation. */
300 supports_breakpoints (void)
302 return (the_low_target
.get_pc
!= NULL
);
305 /* Returns true if this target can support fast tracepoints. This
306 does not mean that the in-process agent has been loaded in the
310 supports_fast_tracepoints (void)
312 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
315 /* True if LWP is stopped in its stepping range. */
318 lwp_in_step_range (struct lwp_info
*lwp
)
320 CORE_ADDR pc
= lwp
->stop_pc
;
322 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
325 struct pending_signals
329 struct pending_signals
*prev
;
332 /* The read/write ends of the pipe registered as waitable file in the
334 static int linux_event_pipe
[2] = { -1, -1 };
336 /* True if we're currently in async mode. */
337 #define target_is_async_p() (linux_event_pipe[0] != -1)
339 static void send_sigstop (struct lwp_info
*lwp
);
340 static void wait_for_sigstop (void);
342 /* Return non-zero if HEADER is a 64-bit ELF file. */
345 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
347 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
348 && header
->e_ident
[EI_MAG1
] == ELFMAG1
349 && header
->e_ident
[EI_MAG2
] == ELFMAG2
350 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
352 *machine
= header
->e_machine
;
353 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
360 /* Return non-zero if FILE is a 64-bit ELF file,
361 zero if the file is not a 64-bit ELF file,
362 and -1 if the file is not accessible or doesn't exist. */
365 elf_64_file_p (const char *file
, unsigned int *machine
)
370 fd
= open (file
, O_RDONLY
);
374 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
381 return elf_64_header_p (&header
, machine
);
384 /* Accepts an integer PID; Returns true if the executable PID is
385 running is a 64-bit ELF file.. */
388 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
392 sprintf (file
, "/proc/%d/exe", pid
);
393 return elf_64_file_p (file
, machine
);
397 delete_lwp (struct lwp_info
*lwp
)
399 struct thread_info
*thr
= get_lwp_thread (lwp
);
402 debug_printf ("deleting %ld\n", lwpid_of (thr
));
405 free (lwp
->arch_private
);
409 /* Add a process to the common process list, and set its private
412 static struct process_info
*
413 linux_add_process (int pid
, int attached
)
415 struct process_info
*proc
;
417 proc
= add_process (pid
, attached
);
418 proc
->priv
= XCNEW (struct process_info_private
);
420 if (the_low_target
.new_process
!= NULL
)
421 proc
->priv
->arch_private
= the_low_target
.new_process ();
426 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
428 /* Call the target arch_setup function on the current thread. */
431 linux_arch_setup (void)
433 the_low_target
.arch_setup ();
436 /* Call the target arch_setup function on THREAD. */
439 linux_arch_setup_thread (struct thread_info
*thread
)
441 struct thread_info
*saved_thread
;
443 saved_thread
= current_thread
;
444 current_thread
= thread
;
448 current_thread
= saved_thread
;
451 /* Handle a GNU/Linux extended wait response. If we see a clone,
452 fork, or vfork event, we need to add the new LWP to our list
453 (and return 0 so as not to report the trap to higher layers).
454 If we see an exec event, we will modify ORIG_EVENT_LWP to point
455 to a new LWP representing the new program. */
458 handle_extended_wait (struct lwp_info
**orig_event_lwp
, int wstat
)
460 struct lwp_info
*event_lwp
= *orig_event_lwp
;
461 int event
= linux_ptrace_get_extended_event (wstat
);
462 struct thread_info
*event_thr
= get_lwp_thread (event_lwp
);
463 struct lwp_info
*new_lwp
;
465 gdb_assert (event_lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
467 /* All extended events we currently use are mid-syscall. Only
468 PTRACE_EVENT_STOP is delivered more like a signal-stop, but
469 you have to be using PTRACE_SEIZE to get that. */
470 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
472 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
473 || (event
== PTRACE_EVENT_CLONE
))
476 unsigned long new_pid
;
479 /* Get the pid of the new lwp. */
480 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
483 /* If we haven't already seen the new PID stop, wait for it now. */
484 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
486 /* The new child has a pending SIGSTOP. We can't affect it until it
487 hits the SIGSTOP, but we're already attached. */
489 ret
= my_waitpid (new_pid
, &status
, __WALL
);
492 perror_with_name ("waiting for new child");
493 else if (ret
!= new_pid
)
494 warning ("wait returned unexpected PID %d", ret
);
495 else if (!WIFSTOPPED (status
))
496 warning ("wait returned unexpected status 0x%x", status
);
499 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
501 struct process_info
*parent_proc
;
502 struct process_info
*child_proc
;
503 struct lwp_info
*child_lwp
;
504 struct thread_info
*child_thr
;
505 struct target_desc
*tdesc
;
507 ptid
= ptid_build (new_pid
, new_pid
, 0);
511 debug_printf ("HEW: Got fork event from LWP %ld, "
513 ptid_get_lwp (ptid_of (event_thr
)),
514 ptid_get_pid (ptid
));
517 /* Add the new process to the tables and clone the breakpoint
518 lists of the parent. We need to do this even if the new process
519 will be detached, since we will need the process object and the
520 breakpoints to remove any breakpoints from memory when we
521 detach, and the client side will access registers. */
522 child_proc
= linux_add_process (new_pid
, 0);
523 gdb_assert (child_proc
!= NULL
);
524 child_lwp
= add_lwp (ptid
);
525 gdb_assert (child_lwp
!= NULL
);
526 child_lwp
->stopped
= 1;
527 child_lwp
->must_set_ptrace_flags
= 1;
528 child_lwp
->status_pending_p
= 0;
529 child_thr
= get_lwp_thread (child_lwp
);
530 child_thr
->last_resume_kind
= resume_stop
;
531 child_thr
->last_status
.kind
= TARGET_WAITKIND_STOPPED
;
533 /* If we're suspending all threads, leave this one suspended
534 too. If the fork/clone parent is stepping over a breakpoint,
535 all other threads have been suspended already. Leave the
536 child suspended too. */
537 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
538 || event_lwp
->bp_reinsert
!= 0)
541 debug_printf ("HEW: leaving child suspended\n");
542 child_lwp
->suspended
= 1;
545 parent_proc
= get_thread_process (event_thr
);
546 child_proc
->attached
= parent_proc
->attached
;
548 if (event_lwp
->bp_reinsert
!= 0
549 && can_software_single_step ()
550 && event
== PTRACE_EVENT_VFORK
)
552 /* If we leave reinsert breakpoints there, child will
553 hit it, so uninsert reinsert breakpoints from parent
554 (and child). Once vfork child is done, reinsert
555 them back to parent. */
556 uninsert_reinsert_breakpoints (event_thr
);
559 clone_all_breakpoints (child_thr
, event_thr
);
561 tdesc
= XNEW (struct target_desc
);
562 copy_target_description (tdesc
, parent_proc
->tdesc
);
563 child_proc
->tdesc
= tdesc
;
565 /* Clone arch-specific process data. */
566 if (the_low_target
.new_fork
!= NULL
)
567 the_low_target
.new_fork (parent_proc
, child_proc
);
569 /* Save fork info in the parent thread. */
570 if (event
== PTRACE_EVENT_FORK
)
571 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
572 else if (event
== PTRACE_EVENT_VFORK
)
573 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
575 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
577 /* The status_pending field contains bits denoting the
578 extended event, so when the pending event is handled,
579 the handler will look at lwp->waitstatus. */
580 event_lwp
->status_pending_p
= 1;
581 event_lwp
->status_pending
= wstat
;
583 /* If the parent thread is doing step-over with reinsert
584 breakpoints, the list of reinsert breakpoints are cloned
585 from the parent's. Remove them from the child process.
586 In case of vfork, we'll reinsert them back once vforked
588 if (event_lwp
->bp_reinsert
!= 0
589 && can_software_single_step ())
591 /* The child process is forked and stopped, so it is safe
592 to access its memory without stopping all other threads
593 from other processes. */
594 delete_reinsert_breakpoints (child_thr
);
596 gdb_assert (has_reinsert_breakpoints (event_thr
));
597 gdb_assert (!has_reinsert_breakpoints (child_thr
));
600 /* Report the event. */
605 debug_printf ("HEW: Got clone event "
606 "from LWP %ld, new child is LWP %ld\n",
607 lwpid_of (event_thr
), new_pid
);
609 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
610 new_lwp
= add_lwp (ptid
);
612 /* Either we're going to immediately resume the new thread
613 or leave it stopped. linux_resume_one_lwp is a nop if it
614 thinks the thread is currently running, so set this first
615 before calling linux_resume_one_lwp. */
616 new_lwp
->stopped
= 1;
618 /* If we're suspending all threads, leave this one suspended
619 too. If the fork/clone parent is stepping over a breakpoint,
620 all other threads have been suspended already. Leave the
621 child suspended too. */
622 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
623 || event_lwp
->bp_reinsert
!= 0)
624 new_lwp
->suspended
= 1;
626 /* Normally we will get the pending SIGSTOP. But in some cases
627 we might get another signal delivered to the group first.
628 If we do get another signal, be sure not to lose it. */
629 if (WSTOPSIG (status
) != SIGSTOP
)
631 new_lwp
->stop_expected
= 1;
632 new_lwp
->status_pending_p
= 1;
633 new_lwp
->status_pending
= status
;
635 else if (report_thread_events
)
637 new_lwp
->waitstatus
.kind
= TARGET_WAITKIND_THREAD_CREATED
;
638 new_lwp
->status_pending_p
= 1;
639 new_lwp
->status_pending
= status
;
642 /* Don't report the event. */
645 else if (event
== PTRACE_EVENT_VFORK_DONE
)
647 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
649 if (event_lwp
->bp_reinsert
!= 0 && can_software_single_step ())
651 reinsert_reinsert_breakpoints (event_thr
);
653 gdb_assert (has_reinsert_breakpoints (event_thr
));
656 /* Report the event. */
659 else if (event
== PTRACE_EVENT_EXEC
&& report_exec_events
)
661 struct process_info
*proc
;
662 VEC (int) *syscalls_to_catch
;
668 debug_printf ("HEW: Got exec event from LWP %ld\n",
669 lwpid_of (event_thr
));
672 /* Get the event ptid. */
673 event_ptid
= ptid_of (event_thr
);
674 event_pid
= ptid_get_pid (event_ptid
);
676 /* Save the syscall list from the execing process. */
677 proc
= get_thread_process (event_thr
);
678 syscalls_to_catch
= proc
->syscalls_to_catch
;
679 proc
->syscalls_to_catch
= NULL
;
681 /* Delete the execing process and all its threads. */
683 current_thread
= NULL
;
685 /* Create a new process/lwp/thread. */
686 proc
= linux_add_process (event_pid
, 0);
687 event_lwp
= add_lwp (event_ptid
);
688 event_thr
= get_lwp_thread (event_lwp
);
689 gdb_assert (current_thread
== event_thr
);
690 linux_arch_setup_thread (event_thr
);
692 /* Set the event status. */
693 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
694 event_lwp
->waitstatus
.value
.execd_pathname
695 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
697 /* Mark the exec status as pending. */
698 event_lwp
->stopped
= 1;
699 event_lwp
->status_pending_p
= 1;
700 event_lwp
->status_pending
= wstat
;
701 event_thr
->last_resume_kind
= resume_continue
;
702 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
704 /* Update syscall state in the new lwp, effectively mid-syscall too. */
705 event_lwp
->syscall_state
= TARGET_WAITKIND_SYSCALL_ENTRY
;
707 /* Restore the list to catch. Don't rely on the client, which is free
708 to avoid sending a new list when the architecture doesn't change.
709 Also, for ANY_SYSCALL, the architecture doesn't really matter. */
710 proc
->syscalls_to_catch
= syscalls_to_catch
;
712 /* Report the event. */
713 *orig_event_lwp
= event_lwp
;
717 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
720 /* Return the PC as read from the regcache of LWP, without any
724 get_pc (struct lwp_info
*lwp
)
726 struct thread_info
*saved_thread
;
727 struct regcache
*regcache
;
730 if (the_low_target
.get_pc
== NULL
)
733 saved_thread
= current_thread
;
734 current_thread
= get_lwp_thread (lwp
);
736 regcache
= get_thread_regcache (current_thread
, 1);
737 pc
= (*the_low_target
.get_pc
) (regcache
);
740 debug_printf ("pc is 0x%lx\n", (long) pc
);
742 current_thread
= saved_thread
;
746 /* This function should only be called if LWP got a SYSCALL_SIGTRAP.
747 Fill *SYSNO with the syscall nr trapped. */
750 get_syscall_trapinfo (struct lwp_info
*lwp
, int *sysno
)
752 struct thread_info
*saved_thread
;
753 struct regcache
*regcache
;
755 if (the_low_target
.get_syscall_trapinfo
== NULL
)
757 /* If we cannot get the syscall trapinfo, report an unknown
758 system call number. */
759 *sysno
= UNKNOWN_SYSCALL
;
763 saved_thread
= current_thread
;
764 current_thread
= get_lwp_thread (lwp
);
766 regcache
= get_thread_regcache (current_thread
, 1);
767 (*the_low_target
.get_syscall_trapinfo
) (regcache
, sysno
);
770 debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno
);
772 current_thread
= saved_thread
;
775 static int check_stopped_by_watchpoint (struct lwp_info
*child
);
777 /* Called when the LWP stopped for a signal/trap. If it stopped for a
778 trap check what caused it (breakpoint, watchpoint, trace, etc.),
779 and save the result in the LWP's stop_reason field. If it stopped
780 for a breakpoint, decrement the PC if necessary on the lwp's
781 architecture. Returns true if we now have the LWP's stop PC. */
784 save_stop_reason (struct lwp_info
*lwp
)
787 CORE_ADDR sw_breakpoint_pc
;
788 struct thread_info
*saved_thread
;
789 #if USE_SIGTRAP_SIGINFO
793 if (the_low_target
.get_pc
== NULL
)
797 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
799 /* breakpoint_at reads from the current thread. */
800 saved_thread
= current_thread
;
801 current_thread
= get_lwp_thread (lwp
);
803 #if USE_SIGTRAP_SIGINFO
804 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
805 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
807 if (siginfo
.si_signo
== SIGTRAP
)
809 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
)
810 && GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
812 /* The si_code is ambiguous on this arch -- check debug
814 if (!check_stopped_by_watchpoint (lwp
))
815 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
817 else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
819 /* If we determine the LWP stopped for a SW breakpoint,
820 trust it. Particularly don't check watchpoint
821 registers, because at least on s390, we'd find
822 stopped-by-watchpoint as long as there's a watchpoint
824 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
826 else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo
.si_code
))
828 /* This can indicate either a hardware breakpoint or
829 hardware watchpoint. Check debug registers. */
830 if (!check_stopped_by_watchpoint (lwp
))
831 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
833 else if (siginfo
.si_code
== TRAP_TRACE
)
835 /* We may have single stepped an instruction that
836 triggered a watchpoint. In that case, on some
837 architectures (such as x86), instead of TRAP_HWBKPT,
838 si_code indicates TRAP_TRACE, and we need to check
839 the debug registers separately. */
840 if (!check_stopped_by_watchpoint (lwp
))
841 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
846 /* We may have just stepped a breakpoint instruction. E.g., in
847 non-stop mode, GDB first tells the thread A to step a range, and
848 then the user inserts a breakpoint inside the range. In that
849 case we need to report the breakpoint PC. */
850 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
851 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
852 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
854 if (hardware_breakpoint_inserted_here (pc
))
855 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
857 if (lwp
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
)
858 check_stopped_by_watchpoint (lwp
);
861 if (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
865 struct thread_info
*thr
= get_lwp_thread (lwp
);
867 debug_printf ("CSBB: %s stopped by software breakpoint\n",
868 target_pid_to_str (ptid_of (thr
)));
871 /* Back up the PC if necessary. */
872 if (pc
!= sw_breakpoint_pc
)
874 struct regcache
*regcache
875 = get_thread_regcache (current_thread
, 1);
876 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
879 /* Update this so we record the correct stop PC below. */
880 pc
= sw_breakpoint_pc
;
882 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
)
886 struct thread_info
*thr
= get_lwp_thread (lwp
);
888 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
889 target_pid_to_str (ptid_of (thr
)));
892 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
896 struct thread_info
*thr
= get_lwp_thread (lwp
);
898 debug_printf ("CSBB: %s stopped by hardware watchpoint\n",
899 target_pid_to_str (ptid_of (thr
)));
902 else if (lwp
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
)
906 struct thread_info
*thr
= get_lwp_thread (lwp
);
908 debug_printf ("CSBB: %s stopped by trace\n",
909 target_pid_to_str (ptid_of (thr
)));
914 current_thread
= saved_thread
;
918 static struct lwp_info
*
919 add_lwp (ptid_t ptid
)
921 struct lwp_info
*lwp
;
923 lwp
= XCNEW (struct lwp_info
);
925 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
927 if (the_low_target
.new_thread
!= NULL
)
928 the_low_target
.new_thread (lwp
);
930 lwp
->thread
= add_thread (ptid
, lwp
);
935 /* Start an inferior process and returns its pid.
936 ALLARGS is a vector of program-name and args. */
939 linux_create_inferior (char *program
, char **allargs
)
941 struct lwp_info
*new_lwp
;
944 struct cleanup
*restore_personality
945 = maybe_disable_address_space_randomization (disable_randomization
);
947 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
953 perror_with_name ("fork");
958 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
962 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
963 stdout to stderr so that inferior i/o doesn't corrupt the connection.
964 Also, redirect stdin to /dev/null. */
965 if (remote_connection_is_stdio ())
968 open ("/dev/null", O_RDONLY
);
970 if (write (2, "stdin/stdout redirected\n",
971 sizeof ("stdin/stdout redirected\n") - 1) < 0)
973 /* Errors ignored. */;
977 execv (program
, allargs
);
979 execvp (program
, allargs
);
981 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
987 do_cleanups (restore_personality
);
989 linux_add_process (pid
, 0);
991 ptid
= ptid_build (pid
, pid
, 0);
992 new_lwp
= add_lwp (ptid
);
993 new_lwp
->must_set_ptrace_flags
= 1;
998 /* Implement the post_create_inferior target_ops method. */
1001 linux_post_create_inferior (void)
1003 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
1005 linux_arch_setup ();
1007 if (lwp
->must_set_ptrace_flags
)
1009 struct process_info
*proc
= current_process ();
1010 int options
= linux_low_ptrace_options (proc
->attached
);
1012 linux_enable_event_reporting (lwpid_of (current_thread
), options
);
1013 lwp
->must_set_ptrace_flags
= 0;
1017 /* Attach to an inferior process. Returns 0 on success, ERRNO on
1021 linux_attach_lwp (ptid_t ptid
)
1023 struct lwp_info
*new_lwp
;
1024 int lwpid
= ptid_get_lwp (ptid
);
1026 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
1030 new_lwp
= add_lwp (ptid
);
1032 /* We need to wait for SIGSTOP before being able to make the next
1033 ptrace call on this LWP. */
1034 new_lwp
->must_set_ptrace_flags
= 1;
1036 if (linux_proc_pid_is_stopped (lwpid
))
1039 debug_printf ("Attached to a stopped process\n");
1041 /* The process is definitely stopped. It is in a job control
1042 stop, unless the kernel predates the TASK_STOPPED /
1043 TASK_TRACED distinction, in which case it might be in a
1044 ptrace stop. Make sure it is in a ptrace stop; from there we
1045 can kill it, signal it, et cetera.
1047 First make sure there is a pending SIGSTOP. Since we are
1048 already attached, the process can not transition from stopped
1049 to running without a PTRACE_CONT; so we know this signal will
1050 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1051 probably already in the queue (unless this kernel is old
1052 enough to use TASK_STOPPED for ptrace stops); but since
1053 SIGSTOP is not an RT signal, it can only be queued once. */
1054 kill_lwp (lwpid
, SIGSTOP
);
1056 /* Finally, resume the stopped process. This will deliver the
1057 SIGSTOP (or a higher priority signal, just like normal
1058 PTRACE_ATTACH), which we'll catch later on. */
1059 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1062 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
1063 brings it to a halt.
1065 There are several cases to consider here:
1067 1) gdbserver has already attached to the process and is being notified
1068 of a new thread that is being created.
1069 In this case we should ignore that SIGSTOP and resume the
1070 process. This is handled below by setting stop_expected = 1,
1071 and the fact that add_thread sets last_resume_kind ==
1074 2) This is the first thread (the process thread), and we're attaching
1075 to it via attach_inferior.
1076 In this case we want the process thread to stop.
1077 This is handled by having linux_attach set last_resume_kind ==
1078 resume_stop after we return.
1080 If the pid we are attaching to is also the tgid, we attach to and
1081 stop all the existing threads. Otherwise, we attach to pid and
1082 ignore any other threads in the same group as this pid.
1084 3) GDB is connecting to gdbserver and is requesting an enumeration of all
1086 In this case we want the thread to stop.
1087 FIXME: This case is currently not properly handled.
1088 We should wait for the SIGSTOP but don't. Things work apparently
1089 because enough time passes between when we ptrace (ATTACH) and when
1090 gdb makes the next ptrace call on the thread.
1092 On the other hand, if we are currently trying to stop all threads, we
1093 should treat the new thread as if we had sent it a SIGSTOP. This works
1094 because we are guaranteed that the add_lwp call above added us to the
1095 end of the list, and so the new thread has not yet reached
1096 wait_for_sigstop (but will). */
1097 new_lwp
->stop_expected
= 1;
1102 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
1103 already attached. Returns true if a new LWP is found, false
1107 attach_proc_task_lwp_callback (ptid_t ptid
)
1109 /* Is this a new thread? */
1110 if (find_thread_ptid (ptid
) == NULL
)
1112 int lwpid
= ptid_get_lwp (ptid
);
1116 debug_printf ("Found new lwp %d\n", lwpid
);
1118 err
= linux_attach_lwp (ptid
);
1120 /* Be quiet if we simply raced with the thread exiting. EPERM
1121 is returned if the thread's task still exists, and is marked
1122 as exited or zombie, as well as other conditions, so in that
1123 case, confirm the status in /proc/PID/status. */
1125 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1129 debug_printf ("Cannot attach to lwp %d: "
1130 "thread is gone (%d: %s)\n",
1131 lwpid
, err
, strerror (err
));
1136 warning (_("Cannot attach to lwp %d: %s"),
1138 linux_ptrace_attach_fail_reason_string (ptid
, err
));
1146 static void async_file_mark (void);
1148 /* Attach to PID. If PID is the tgid, attach to it and all
1152 linux_attach (unsigned long pid
)
1154 struct process_info
*proc
;
1155 struct thread_info
*initial_thread
;
1156 ptid_t ptid
= ptid_build (pid
, pid
, 0);
1159 /* Attach to PID. We will check for other threads
1161 err
= linux_attach_lwp (ptid
);
1163 error ("Cannot attach to process %ld: %s",
1164 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
1166 proc
= linux_add_process (pid
, 1);
1168 /* Don't ignore the initial SIGSTOP if we just attached to this
1169 process. It will be collected by wait shortly. */
1170 initial_thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
1171 initial_thread
->last_resume_kind
= resume_stop
;
1173 /* We must attach to every LWP. If /proc is mounted, use that to
1174 find them now. On the one hand, the inferior may be using raw
1175 clone instead of using pthreads. On the other hand, even if it
1176 is using pthreads, GDB may not be connected yet (thread_db needs
1177 to do symbol lookups, through qSymbol). Also, thread_db walks
1178 structures in the inferior's address space to find the list of
1179 threads/LWPs, and those structures may well be corrupted. Note
1180 that once thread_db is loaded, we'll still use it to list threads
1181 and associate pthread info with each LWP. */
1182 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1184 /* GDB will shortly read the xml target description for this
1185 process, to figure out the process' architecture. But the target
1186 description is only filled in when the first process/thread in
1187 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1188 that now, otherwise, if GDB is fast enough, it could read the
1189 target description _before_ that initial stop. */
1192 struct lwp_info
*lwp
;
1194 ptid_t pid_ptid
= pid_to_ptid (pid
);
1196 lwpid
= linux_wait_for_event_filtered (pid_ptid
, pid_ptid
,
1198 gdb_assert (lwpid
> 0);
1200 lwp
= find_lwp_pid (pid_to_ptid (lwpid
));
1202 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGSTOP
)
1204 lwp
->status_pending_p
= 1;
1205 lwp
->status_pending
= wstat
;
1208 initial_thread
->last_resume_kind
= resume_continue
;
1212 gdb_assert (proc
->tdesc
!= NULL
);
1225 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
1227 struct counter
*counter
= (struct counter
*) args
;
1229 if (ptid_get_pid (entry
->id
) == counter
->pid
)
1231 if (++counter
->count
> 1)
1239 last_thread_of_process_p (int pid
)
1241 struct counter counter
= { pid
, 0 };
1243 return (find_inferior (&all_threads
,
1244 second_thread_of_pid_p
, &counter
) == NULL
);
1250 linux_kill_one_lwp (struct lwp_info
*lwp
)
1252 struct thread_info
*thr
= get_lwp_thread (lwp
);
1253 int pid
= lwpid_of (thr
);
1255 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1256 there is no signal context, and ptrace(PTRACE_KILL) (or
1257 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1258 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1259 alternative is to kill with SIGKILL. We only need one SIGKILL
1260 per process, not one for each thread. But since we still support
1261 support debugging programs using raw clone without CLONE_THREAD,
1262 we send one for each thread. For years, we used PTRACE_KILL
1263 only, so we're being a bit paranoid about some old kernels where
1264 PTRACE_KILL might work better (dubious if there are any such, but
1265 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1266 second, and so we're fine everywhere. */
1269 kill_lwp (pid
, SIGKILL
);
1272 int save_errno
= errno
;
1274 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1275 target_pid_to_str (ptid_of (thr
)),
1276 save_errno
? strerror (save_errno
) : "OK");
1280 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1283 int save_errno
= errno
;
1285 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1286 target_pid_to_str (ptid_of (thr
)),
1287 save_errno
? strerror (save_errno
) : "OK");
1291 /* Kill LWP and wait for it to die. */
1294 kill_wait_lwp (struct lwp_info
*lwp
)
1296 struct thread_info
*thr
= get_lwp_thread (lwp
);
1297 int pid
= ptid_get_pid (ptid_of (thr
));
1298 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1303 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1307 linux_kill_one_lwp (lwp
);
1309 /* Make sure it died. Notes:
1311 - The loop is most likely unnecessary.
1313 - We don't use linux_wait_for_event as that could delete lwps
1314 while we're iterating over them. We're not interested in
1315 any pending status at this point, only in making sure all
1316 wait status on the kernel side are collected until the
1319 - We don't use __WALL here as the __WALL emulation relies on
1320 SIGCHLD, and killing a stopped process doesn't generate
1321 one, nor an exit status.
1323 res
= my_waitpid (lwpid
, &wstat
, 0);
1324 if (res
== -1 && errno
== ECHILD
)
1325 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1326 } while (res
> 0 && WIFSTOPPED (wstat
));
1328 /* Even if it was stopped, the child may have already disappeared.
1329 E.g., if it was killed by SIGKILL. */
1330 if (res
< 0 && errno
!= ECHILD
)
1331 perror_with_name ("kill_wait_lwp");
1334 /* Callback for `find_inferior'. Kills an lwp of a given process,
1335 except the leader. */
1338 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1340 struct thread_info
*thread
= (struct thread_info
*) entry
;
1341 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1342 int pid
= * (int *) args
;
1344 if (ptid_get_pid (entry
->id
) != pid
)
1347 /* We avoid killing the first thread here, because of a Linux kernel (at
1348 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1349 the children get a chance to be reaped, it will remain a zombie
1352 if (lwpid_of (thread
) == pid
)
1355 debug_printf ("lkop: is last of process %s\n",
1356 target_pid_to_str (entry
->id
));
1360 kill_wait_lwp (lwp
);
1365 linux_kill (int pid
)
1367 struct process_info
*process
;
1368 struct lwp_info
*lwp
;
1370 process
= find_process_pid (pid
);
1371 if (process
== NULL
)
1374 /* If we're killing a running inferior, make sure it is stopped
1375 first, as PTRACE_KILL will not work otherwise. */
1376 stop_all_lwps (0, NULL
);
1378 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1380 /* See the comment in linux_kill_one_lwp. We did not kill the first
1381 thread in the list, so do so now. */
1382 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1387 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1391 kill_wait_lwp (lwp
);
1393 the_target
->mourn (process
);
1395 /* Since we presently can only stop all lwps of all processes, we
1396 need to unstop lwps of other processes. */
1397 unstop_all_lwps (0, NULL
);
1401 /* Get pending signal of THREAD, for detaching purposes. This is the
1402 signal the thread last stopped for, which we need to deliver to the
1403 thread when detaching, otherwise, it'd be suppressed/lost. */
1406 get_detach_signal (struct thread_info
*thread
)
1408 enum gdb_signal signo
= GDB_SIGNAL_0
;
1410 struct lwp_info
*lp
= get_thread_lwp (thread
);
1412 if (lp
->status_pending_p
)
1413 status
= lp
->status_pending
;
1416 /* If the thread had been suspended by gdbserver, and it stopped
1417 cleanly, then it'll have stopped with SIGSTOP. But we don't
1418 want to deliver that SIGSTOP. */
1419 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1420 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1423 /* Otherwise, we may need to deliver the signal we
1425 status
= lp
->last_status
;
1428 if (!WIFSTOPPED (status
))
1431 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1432 target_pid_to_str (ptid_of (thread
)));
1436 /* Extended wait statuses aren't real SIGTRAPs. */
1437 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1440 debug_printf ("GPS: lwp %s had stopped with extended "
1441 "status: no pending signal\n",
1442 target_pid_to_str (ptid_of (thread
)));
1446 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1448 if (program_signals_p
&& !program_signals
[signo
])
1451 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1452 target_pid_to_str (ptid_of (thread
)),
1453 gdb_signal_to_string (signo
));
1456 else if (!program_signals_p
1457 /* If we have no way to know which signals GDB does not
1458 want to have passed to the program, assume
1459 SIGTRAP/SIGINT, which is GDB's default. */
1460 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1463 debug_printf ("GPS: lwp %s had signal %s, "
1464 "but we don't know if we should pass it. "
1465 "Default to not.\n",
1466 target_pid_to_str (ptid_of (thread
)),
1467 gdb_signal_to_string (signo
));
1473 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1474 target_pid_to_str (ptid_of (thread
)),
1475 gdb_signal_to_string (signo
));
1477 return WSTOPSIG (status
);
1481 /* Detach from LWP. */
1484 linux_detach_one_lwp (struct lwp_info
*lwp
)
1486 struct thread_info
*thread
= get_lwp_thread (lwp
);
1490 /* If there is a pending SIGSTOP, get rid of it. */
1491 if (lwp
->stop_expected
)
1494 debug_printf ("Sending SIGCONT to %s\n",
1495 target_pid_to_str (ptid_of (thread
)));
1497 kill_lwp (lwpid_of (thread
), SIGCONT
);
1498 lwp
->stop_expected
= 0;
1501 /* Pass on any pending signal for this thread. */
1502 sig
= get_detach_signal (thread
);
1504 /* Preparing to resume may try to write registers, and fail if the
1505 lwp is zombie. If that happens, ignore the error. We'll handle
1506 it below, when detach fails with ESRCH. */
1509 /* Flush any pending changes to the process's registers. */
1510 regcache_invalidate_thread (thread
);
1512 /* Finally, let it resume. */
1513 if (the_low_target
.prepare_to_resume
!= NULL
)
1514 the_low_target
.prepare_to_resume (lwp
);
1516 CATCH (ex
, RETURN_MASK_ERROR
)
1518 if (!check_ptrace_stopped_lwp_gone (lwp
))
1519 throw_exception (ex
);
1523 lwpid
= lwpid_of (thread
);
1524 if (ptrace (PTRACE_DETACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0,
1525 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1527 int save_errno
= errno
;
1529 /* We know the thread exists, so ESRCH must mean the lwp is
1530 zombie. This can happen if one of the already-detached
1531 threads exits the whole thread group. In that case we're
1532 still attached, and must reap the lwp. */
1533 if (save_errno
== ESRCH
)
1537 ret
= my_waitpid (lwpid
, &status
, __WALL
);
1540 warning (_("Couldn't reap LWP %d while detaching: %s"),
1541 lwpid
, strerror (errno
));
1543 else if (!WIFEXITED (status
) && !WIFSIGNALED (status
))
1545 warning (_("Reaping LWP %d while detaching "
1546 "returned unexpected status 0x%x"),
1552 error (_("Can't detach %s: %s"),
1553 target_pid_to_str (ptid_of (thread
)),
1554 strerror (save_errno
));
1557 else if (debug_threads
)
1559 debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n",
1560 target_pid_to_str (ptid_of (thread
)),
1567 /* Callback for find_inferior. Detaches from non-leader threads of a
1571 linux_detach_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1573 struct thread_info
*thread
= (struct thread_info
*) entry
;
1574 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1575 int pid
= *(int *) args
;
1576 int lwpid
= lwpid_of (thread
);
1578 /* Skip other processes. */
1579 if (ptid_get_pid (entry
->id
) != pid
)
1582 /* We don't actually detach from the thread group leader just yet.
1583 If the thread group exits, we must reap the zombie clone lwps
1584 before we're able to reap the leader. */
1585 if (ptid_get_pid (entry
->id
) == lwpid
)
1588 linux_detach_one_lwp (lwp
);
1593 linux_detach (int pid
)
1595 struct process_info
*process
;
1596 struct lwp_info
*main_lwp
;
1598 process
= find_process_pid (pid
);
1599 if (process
== NULL
)
1602 /* As there's a step over already in progress, let it finish first,
1603 otherwise nesting a stabilize_threads operation on top gets real
1605 complete_ongoing_step_over ();
1607 /* Stop all threads before detaching. First, ptrace requires that
1608 the thread is stopped to sucessfully detach. Second, thread_db
1609 may need to uninstall thread event breakpoints from memory, which
1610 only works with a stopped process anyway. */
1611 stop_all_lwps (0, NULL
);
1613 #ifdef USE_THREAD_DB
1614 thread_db_detach (process
);
1617 /* Stabilize threads (move out of jump pads). */
1618 stabilize_threads ();
1620 /* Detach from the clone lwps first. If the thread group exits just
1621 while we're detaching, we must reap the clone lwps before we're
1622 able to reap the leader. */
1623 find_inferior (&all_threads
, linux_detach_lwp_callback
, &pid
);
1625 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1626 linux_detach_one_lwp (main_lwp
);
1628 the_target
->mourn (process
);
1630 /* Since we presently can only stop all lwps of all processes, we
1631 need to unstop lwps of other processes. */
1632 unstop_all_lwps (0, NULL
);
1636 /* Remove all LWPs that belong to process PROC from the lwp list. */
1639 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1641 struct thread_info
*thread
= (struct thread_info
*) entry
;
1642 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1643 struct process_info
*process
= (struct process_info
*) proc
;
1645 if (pid_of (thread
) == pid_of (process
))
1652 linux_mourn (struct process_info
*process
)
1654 struct process_info_private
*priv
;
1656 #ifdef USE_THREAD_DB
1657 thread_db_mourn (process
);
1660 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1662 /* Freeing all private data. */
1663 priv
= process
->priv
;
1664 free (priv
->arch_private
);
1666 process
->priv
= NULL
;
1668 remove_process (process
);
1672 linux_join (int pid
)
1677 ret
= my_waitpid (pid
, &status
, 0);
1678 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1680 } while (ret
!= -1 || errno
!= ECHILD
);
1683 /* Return nonzero if the given thread is still alive. */
1685 linux_thread_alive (ptid_t ptid
)
1687 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1689 /* We assume we always know if a thread exits. If a whole process
1690 exited but we still haven't been able to report it to GDB, we'll
1691 hold on to the last lwp of the dead process. */
1693 return !lwp_is_marked_dead (lwp
);
1698 /* Return 1 if this lwp still has an interesting status pending. If
1699 not (e.g., it had stopped for a breakpoint that is gone), return
1703 thread_still_has_status_pending_p (struct thread_info
*thread
)
1705 struct lwp_info
*lp
= get_thread_lwp (thread
);
1707 if (!lp
->status_pending_p
)
1710 if (thread
->last_resume_kind
!= resume_stop
1711 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1712 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1714 struct thread_info
*saved_thread
;
1718 gdb_assert (lp
->last_status
!= 0);
1722 saved_thread
= current_thread
;
1723 current_thread
= thread
;
1725 if (pc
!= lp
->stop_pc
)
1728 debug_printf ("PC of %ld changed\n",
1733 #if !USE_SIGTRAP_SIGINFO
1734 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1735 && !(*the_low_target
.breakpoint_at
) (pc
))
1738 debug_printf ("previous SW breakpoint of %ld gone\n",
1742 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1743 && !hardware_breakpoint_inserted_here (pc
))
1746 debug_printf ("previous HW breakpoint of %ld gone\n",
1752 current_thread
= saved_thread
;
1757 debug_printf ("discarding pending breakpoint status\n");
1758 lp
->status_pending_p
= 0;
1766 /* Returns true if LWP is resumed from the client's perspective. */
1769 lwp_resumed (struct lwp_info
*lwp
)
1771 struct thread_info
*thread
= get_lwp_thread (lwp
);
1773 if (thread
->last_resume_kind
!= resume_stop
)
1776 /* Did gdb send us a `vCont;t', but we haven't reported the
1777 corresponding stop to gdb yet? If so, the thread is still
1778 resumed/running from gdb's perspective. */
1779 if (thread
->last_resume_kind
== resume_stop
1780 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1786 /* Return 1 if this lwp has an interesting status pending. */
1788 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1790 struct thread_info
*thread
= (struct thread_info
*) entry
;
1791 struct lwp_info
*lp
= get_thread_lwp (thread
);
1792 ptid_t ptid
= * (ptid_t
*) arg
;
1794 /* Check if we're only interested in events from a specific process
1795 or a specific LWP. */
1796 if (!ptid_match (ptid_of (thread
), ptid
))
1799 if (!lwp_resumed (lp
))
1802 if (lp
->status_pending_p
1803 && !thread_still_has_status_pending_p (thread
))
1805 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1809 return lp
->status_pending_p
;
1813 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1815 ptid_t ptid
= *(ptid_t
*) data
;
1818 if (ptid_get_lwp (ptid
) != 0)
1819 lwp
= ptid_get_lwp (ptid
);
1821 lwp
= ptid_get_pid (ptid
);
1823 if (ptid_get_lwp (entry
->id
) == lwp
)
1830 find_lwp_pid (ptid_t ptid
)
1832 struct inferior_list_entry
*thread
1833 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1838 return get_thread_lwp ((struct thread_info
*) thread
);
1841 /* Return the number of known LWPs in the tgid given by PID. */
1846 struct inferior_list_entry
*inf
, *tmp
;
1849 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1851 if (ptid_get_pid (inf
->id
) == pid
)
1858 /* The arguments passed to iterate_over_lwps. */
1860 struct iterate_over_lwps_args
1862 /* The FILTER argument passed to iterate_over_lwps. */
1865 /* The CALLBACK argument passed to iterate_over_lwps. */
1866 iterate_over_lwps_ftype
*callback
;
1868 /* The DATA argument passed to iterate_over_lwps. */
1872 /* Callback for find_inferior used by iterate_over_lwps to filter
1873 calls to the callback supplied to that function. Returning a
1874 nonzero value causes find_inferiors to stop iterating and return
1875 the current inferior_list_entry. Returning zero indicates that
1876 find_inferiors should continue iterating. */
1879 iterate_over_lwps_filter (struct inferior_list_entry
*entry
, void *args_p
)
1881 struct iterate_over_lwps_args
*args
1882 = (struct iterate_over_lwps_args
*) args_p
;
1884 if (ptid_match (entry
->id
, args
->filter
))
1886 struct thread_info
*thr
= (struct thread_info
*) entry
;
1887 struct lwp_info
*lwp
= get_thread_lwp (thr
);
1889 return (*args
->callback
) (lwp
, args
->data
);
1895 /* See nat/linux-nat.h. */
1898 iterate_over_lwps (ptid_t filter
,
1899 iterate_over_lwps_ftype callback
,
1902 struct iterate_over_lwps_args args
= {filter
, callback
, data
};
1903 struct inferior_list_entry
*entry
;
1905 entry
= find_inferior (&all_threads
, iterate_over_lwps_filter
, &args
);
1909 return get_thread_lwp ((struct thread_info
*) entry
);
1912 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1913 their exits until all other threads in the group have exited. */
1916 check_zombie_leaders (void)
1918 struct process_info
*proc
, *tmp
;
1920 ALL_PROCESSES (proc
, tmp
)
1922 pid_t leader_pid
= pid_of (proc
);
1923 struct lwp_info
*leader_lp
;
1925 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1928 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1929 "num_lwps=%d, zombie=%d\n",
1930 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1931 linux_proc_pid_is_zombie (leader_pid
));
1933 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1934 /* Check if there are other threads in the group, as we may
1935 have raced with the inferior simply exiting. */
1936 && !last_thread_of_process_p (leader_pid
)
1937 && linux_proc_pid_is_zombie (leader_pid
))
1939 /* A leader zombie can mean one of two things:
1941 - It exited, and there's an exit status pending
1942 available, or only the leader exited (not the whole
1943 program). In the latter case, we can't waitpid the
1944 leader's exit status until all other threads are gone.
1946 - There are 3 or more threads in the group, and a thread
1947 other than the leader exec'd. On an exec, the Linux
1948 kernel destroys all other threads (except the execing
1949 one) in the thread group, and resets the execing thread's
1950 tid to the tgid. No exit notification is sent for the
1951 execing thread -- from the ptracer's perspective, it
1952 appears as though the execing thread just vanishes.
1953 Until we reap all other threads except the leader and the
1954 execing thread, the leader will be zombie, and the
1955 execing thread will be in `D (disc sleep)'. As soon as
1956 all other threads are reaped, the execing thread changes
1957 it's tid to the tgid, and the previous (zombie) leader
1958 vanishes, giving place to the "new" leader. We could try
1959 distinguishing the exit and exec cases, by waiting once
1960 more, and seeing if something comes out, but it doesn't
1961 sound useful. The previous leader _does_ go away, and
1962 we'll re-add the new one once we see the exec event
1963 (which is just the same as what would happen if the
1964 previous leader did exit voluntarily before some other
1969 "CZL: Thread group leader %d zombie "
1970 "(it exited, or another thread execd).\n",
1973 delete_lwp (leader_lp
);
1978 /* Callback for `find_inferior'. Returns the first LWP that is not
1979 stopped. ARG is a PTID filter. */
1982 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
1984 struct thread_info
*thr
= (struct thread_info
*) entry
;
1985 struct lwp_info
*lwp
;
1986 ptid_t filter
= *(ptid_t
*) arg
;
1988 if (!ptid_match (ptid_of (thr
), filter
))
1991 lwp
= get_thread_lwp (thr
);
1998 /* Increment LWP's suspend count. */
2001 lwp_suspended_inc (struct lwp_info
*lwp
)
2005 if (debug_threads
&& lwp
->suspended
> 4)
2007 struct thread_info
*thread
= get_lwp_thread (lwp
);
2009 debug_printf ("LWP %ld has a suspiciously high suspend count,"
2010 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
2014 /* Decrement LWP's suspend count. */
2017 lwp_suspended_decr (struct lwp_info
*lwp
)
2021 if (lwp
->suspended
< 0)
2023 struct thread_info
*thread
= get_lwp_thread (lwp
);
2025 internal_error (__FILE__
, __LINE__
,
2026 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
2031 /* This function should only be called if the LWP got a SIGTRAP.
2033 Handle any tracepoint steps or hits. Return true if a tracepoint
2034 event was handled, 0 otherwise. */
2037 handle_tracepoints (struct lwp_info
*lwp
)
2039 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
2040 int tpoint_related_event
= 0;
2042 gdb_assert (lwp
->suspended
== 0);
2044 /* If this tracepoint hit causes a tracing stop, we'll immediately
2045 uninsert tracepoints. To do this, we temporarily pause all
2046 threads, unpatch away, and then unpause threads. We need to make
2047 sure the unpausing doesn't resume LWP too. */
2048 lwp_suspended_inc (lwp
);
2050 /* And we need to be sure that any all-threads-stopping doesn't try
2051 to move threads out of the jump pads, as it could deadlock the
2052 inferior (LWP could be in the jump pad, maybe even holding the
2055 /* Do any necessary step collect actions. */
2056 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
2058 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
2060 /* See if we just hit a tracepoint and do its main collect
2062 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
2064 lwp_suspended_decr (lwp
);
2066 gdb_assert (lwp
->suspended
== 0);
2067 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
2069 if (tpoint_related_event
)
2072 debug_printf ("got a tracepoint event\n");
2079 /* Convenience wrapper. Returns true if LWP is presently collecting a
2083 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
2084 struct fast_tpoint_collect_status
*status
)
2086 CORE_ADDR thread_area
;
2087 struct thread_info
*thread
= get_lwp_thread (lwp
);
2089 if (the_low_target
.get_thread_area
== NULL
)
2092 /* Get the thread area address. This is used to recognize which
2093 thread is which when tracing with the in-process agent library.
2094 We don't read anything from the address, and treat it as opaque;
2095 it's the address itself that we assume is unique per-thread. */
2096 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
2099 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
2102 /* The reason we resume in the caller, is because we want to be able
2103 to pass lwp->status_pending as WSTAT, and we need to clear
2104 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2105 refuses to resume. */
2108 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
2110 struct thread_info
*saved_thread
;
2112 saved_thread
= current_thread
;
2113 current_thread
= get_lwp_thread (lwp
);
2116 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
2117 && supports_fast_tracepoints ()
2118 && agent_loaded_p ())
2120 struct fast_tpoint_collect_status status
;
2124 debug_printf ("Checking whether LWP %ld needs to move out of the "
2126 lwpid_of (current_thread
));
2128 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
2131 || (WSTOPSIG (*wstat
) != SIGILL
2132 && WSTOPSIG (*wstat
) != SIGFPE
2133 && WSTOPSIG (*wstat
) != SIGSEGV
2134 && WSTOPSIG (*wstat
) != SIGBUS
))
2136 lwp
->collecting_fast_tracepoint
= r
;
2140 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
2142 /* Haven't executed the original instruction yet.
2143 Set breakpoint there, and wait till it's hit,
2144 then single-step until exiting the jump pad. */
2145 lwp
->exit_jump_pad_bkpt
2146 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
2150 debug_printf ("Checking whether LWP %ld needs to move out of "
2151 "the jump pad...it does\n",
2152 lwpid_of (current_thread
));
2153 current_thread
= saved_thread
;
2160 /* If we get a synchronous signal while collecting, *and*
2161 while executing the (relocated) original instruction,
2162 reset the PC to point at the tpoint address, before
2163 reporting to GDB. Otherwise, it's an IPA lib bug: just
2164 report the signal to GDB, and pray for the best. */
2166 lwp
->collecting_fast_tracepoint
= 0;
2169 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
2170 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
2173 struct regcache
*regcache
;
2175 /* The si_addr on a few signals references the address
2176 of the faulting instruction. Adjust that as
2178 if ((WSTOPSIG (*wstat
) == SIGILL
2179 || WSTOPSIG (*wstat
) == SIGFPE
2180 || WSTOPSIG (*wstat
) == SIGBUS
2181 || WSTOPSIG (*wstat
) == SIGSEGV
)
2182 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2183 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
2184 /* Final check just to make sure we don't clobber
2185 the siginfo of non-kernel-sent signals. */
2186 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
2188 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
2189 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
2190 (PTRACE_TYPE_ARG3
) 0, &info
);
2193 regcache
= get_thread_regcache (current_thread
, 1);
2194 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
2195 lwp
->stop_pc
= status
.tpoint_addr
;
2197 /* Cancel any fast tracepoint lock this thread was
2199 force_unlock_trace_buffer ();
2202 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2205 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2206 "stopping all threads momentarily.\n");
2208 stop_all_lwps (1, lwp
);
2210 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2211 lwp
->exit_jump_pad_bkpt
= NULL
;
2213 unstop_all_lwps (1, lwp
);
2215 gdb_assert (lwp
->suspended
>= 0);
2221 debug_printf ("Checking whether LWP %ld needs to move out of the "
2223 lwpid_of (current_thread
));
2225 current_thread
= saved_thread
;
2229 /* Enqueue one signal in the "signals to report later when out of the
2233 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2235 struct pending_signals
*p_sig
;
2236 struct thread_info
*thread
= get_lwp_thread (lwp
);
2239 debug_printf ("Deferring signal %d for LWP %ld.\n",
2240 WSTOPSIG (*wstat
), lwpid_of (thread
));
2244 struct pending_signals
*sig
;
2246 for (sig
= lwp
->pending_signals_to_report
;
2249 debug_printf (" Already queued %d\n",
2252 debug_printf (" (no more currently queued signals)\n");
2255 /* Don't enqueue non-RT signals if they are already in the deferred
2256 queue. (SIGSTOP being the easiest signal to see ending up here
2258 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2260 struct pending_signals
*sig
;
2262 for (sig
= lwp
->pending_signals_to_report
;
2266 if (sig
->signal
== WSTOPSIG (*wstat
))
2269 debug_printf ("Not requeuing already queued non-RT signal %d"
2278 p_sig
= XCNEW (struct pending_signals
);
2279 p_sig
->prev
= lwp
->pending_signals_to_report
;
2280 p_sig
->signal
= WSTOPSIG (*wstat
);
2282 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2285 lwp
->pending_signals_to_report
= p_sig
;
2288 /* Dequeue one signal from the "signals to report later when out of
2289 the jump pad" list. */
2292 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2294 struct thread_info
*thread
= get_lwp_thread (lwp
);
2296 if (lwp
->pending_signals_to_report
!= NULL
)
2298 struct pending_signals
**p_sig
;
2300 p_sig
= &lwp
->pending_signals_to_report
;
2301 while ((*p_sig
)->prev
!= NULL
)
2302 p_sig
= &(*p_sig
)->prev
;
2304 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2305 if ((*p_sig
)->info
.si_signo
!= 0)
2306 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2312 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2313 WSTOPSIG (*wstat
), lwpid_of (thread
));
2317 struct pending_signals
*sig
;
2319 for (sig
= lwp
->pending_signals_to_report
;
2322 debug_printf (" Still queued %d\n",
2325 debug_printf (" (no more queued signals)\n");
2334 /* Fetch the possibly triggered data watchpoint info and store it in
2337 On some archs, like x86, that use debug registers to set
2338 watchpoints, it's possible that the way to know which watched
2339 address trapped, is to check the register that is used to select
2340 which address to watch. Problem is, between setting the watchpoint
2341 and reading back which data address trapped, the user may change
2342 the set of watchpoints, and, as a consequence, GDB changes the
2343 debug registers in the inferior. To avoid reading back a stale
2344 stopped-data-address when that happens, we cache in LP the fact
2345 that a watchpoint trapped, and the corresponding data address, as
2346 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2347 registers meanwhile, we have the cached data we can rely on. */
2350 check_stopped_by_watchpoint (struct lwp_info
*child
)
2352 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2354 struct thread_info
*saved_thread
;
2356 saved_thread
= current_thread
;
2357 current_thread
= get_lwp_thread (child
);
2359 if (the_low_target
.stopped_by_watchpoint ())
2361 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2363 if (the_low_target
.stopped_data_address
!= NULL
)
2364 child
->stopped_data_address
2365 = the_low_target
.stopped_data_address ();
2367 child
->stopped_data_address
= 0;
2370 current_thread
= saved_thread
;
2373 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2376 /* Return the ptrace options that we want to try to enable. */
2379 linux_low_ptrace_options (int attached
)
2384 options
|= PTRACE_O_EXITKILL
;
2386 if (report_fork_events
)
2387 options
|= PTRACE_O_TRACEFORK
;
2389 if (report_vfork_events
)
2390 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2392 if (report_exec_events
)
2393 options
|= PTRACE_O_TRACEEXEC
;
2395 options
|= PTRACE_O_TRACESYSGOOD
;
2400 /* Do low-level handling of the event, and check if we should go on
2401 and pass it to caller code. Return the affected lwp if we are, or
2404 static struct lwp_info
*
2405 linux_low_filter_event (int lwpid
, int wstat
)
2407 struct lwp_info
*child
;
2408 struct thread_info
*thread
;
2409 int have_stop_pc
= 0;
2411 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2413 /* Check for stop events reported by a process we didn't already
2414 know about - anything not already in our LWP list.
2416 If we're expecting to receive stopped processes after
2417 fork, vfork, and clone events, then we'll just add the
2418 new one to our list and go back to waiting for the event
2419 to be reported - the stopped process might be returned
2420 from waitpid before or after the event is.
2422 But note the case of a non-leader thread exec'ing after the
2423 leader having exited, and gone from our lists (because
2424 check_zombie_leaders deleted it). The non-leader thread
2425 changes its tid to the tgid. */
2427 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2428 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2432 /* A multi-thread exec after we had seen the leader exiting. */
2435 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2436 "after exec.\n", lwpid
);
2439 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2440 child
= add_lwp (child_ptid
);
2442 current_thread
= child
->thread
;
2445 /* If we didn't find a process, one of two things presumably happened:
2446 - A process we started and then detached from has exited. Ignore it.
2447 - A process we are controlling has forked and the new child's stop
2448 was reported to us by the kernel. Save its PID. */
2449 if (child
== NULL
&& WIFSTOPPED (wstat
))
2451 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2454 else if (child
== NULL
)
2457 thread
= get_lwp_thread (child
);
2461 child
->last_status
= wstat
;
2463 /* Check if the thread has exited. */
2464 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2467 debug_printf ("LLFE: %d exited.\n", lwpid
);
2469 if (finish_step_over (child
))
2471 /* Unsuspend all other LWPs, and set them back running again. */
2472 unsuspend_all_lwps (child
);
2475 /* If there is at least one more LWP, then the exit signal was
2476 not the end of the debugged application and should be
2477 ignored, unless GDB wants to hear about thread exits. */
2478 if (report_thread_events
2479 || last_thread_of_process_p (pid_of (thread
)))
2481 /* Since events are serialized to GDB core, and we can't
2482 report this one right now. Leave the status pending for
2483 the next time we're able to report it. */
2484 mark_lwp_dead (child
, wstat
);
2494 gdb_assert (WIFSTOPPED (wstat
));
2496 if (WIFSTOPPED (wstat
))
2498 struct process_info
*proc
;
2500 /* Architecture-specific setup after inferior is running. */
2501 proc
= find_process_pid (pid_of (thread
));
2502 if (proc
->tdesc
== NULL
)
2506 /* This needs to happen after we have attached to the
2507 inferior and it is stopped for the first time, but
2508 before we access any inferior registers. */
2509 linux_arch_setup_thread (thread
);
2513 /* The process is started, but GDBserver will do
2514 architecture-specific setup after the program stops at
2515 the first instruction. */
2516 child
->status_pending_p
= 1;
2517 child
->status_pending
= wstat
;
2523 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2525 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2526 int options
= linux_low_ptrace_options (proc
->attached
);
2528 linux_enable_event_reporting (lwpid
, options
);
2529 child
->must_set_ptrace_flags
= 0;
2532 /* Always update syscall_state, even if it will be filtered later. */
2533 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SYSCALL_SIGTRAP
)
2535 child
->syscall_state
2536 = (child
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2537 ? TARGET_WAITKIND_SYSCALL_RETURN
2538 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2542 /* Almost all other ptrace-stops are known to be outside of system
2543 calls, with further exceptions in handle_extended_wait. */
2544 child
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2547 /* Be careful to not overwrite stop_pc until save_stop_reason is
2549 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2550 && linux_is_extended_waitstatus (wstat
))
2552 child
->stop_pc
= get_pc (child
);
2553 if (handle_extended_wait (&child
, wstat
))
2555 /* The event has been handled, so just return without
2561 if (linux_wstatus_maybe_breakpoint (wstat
))
2563 if (save_stop_reason (child
))
2568 child
->stop_pc
= get_pc (child
);
2570 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2571 && child
->stop_expected
)
2574 debug_printf ("Expected stop.\n");
2575 child
->stop_expected
= 0;
2577 if (thread
->last_resume_kind
== resume_stop
)
2579 /* We want to report the stop to the core. Treat the
2580 SIGSTOP as a normal event. */
2582 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2583 target_pid_to_str (ptid_of (thread
)));
2585 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2587 /* Stopping threads. We don't want this SIGSTOP to end up
2590 debug_printf ("LLW: SIGSTOP caught for %s "
2591 "while stopping threads.\n",
2592 target_pid_to_str (ptid_of (thread
)));
2597 /* This is a delayed SIGSTOP. Filter out the event. */
2599 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2600 child
->stepping
? "step" : "continue",
2601 target_pid_to_str (ptid_of (thread
)));
2603 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2608 child
->status_pending_p
= 1;
2609 child
->status_pending
= wstat
;
2613 /* Return true if THREAD is doing hardware single step. */
2616 maybe_hw_step (struct thread_info
*thread
)
2618 if (can_hardware_single_step ())
2622 /* GDBserver must insert reinsert breakpoint for software
2624 gdb_assert (has_reinsert_breakpoints (thread
));
2629 /* Resume LWPs that are currently stopped without any pending status
2630 to report, but are resumed from the core's perspective. */
2633 resume_stopped_resumed_lwps (struct inferior_list_entry
*entry
)
2635 struct thread_info
*thread
= (struct thread_info
*) entry
;
2636 struct lwp_info
*lp
= get_thread_lwp (thread
);
2640 && !lp
->status_pending_p
2641 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2643 int step
= thread
->last_resume_kind
== resume_step
;
2646 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2647 target_pid_to_str (ptid_of (thread
)),
2648 paddress (lp
->stop_pc
),
2651 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2655 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2656 match FILTER_PTID (leaving others pending). The PTIDs can be:
2657 minus_one_ptid, to specify any child; a pid PTID, specifying all
2658 lwps of a thread group; or a PTID representing a single lwp. Store
2659 the stop status through the status pointer WSTAT. OPTIONS is
2660 passed to the waitpid call. Return 0 if no event was found and
2661 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2662 was found. Return the PID of the stopped child otherwise. */
2665 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2666 int *wstatp
, int options
)
2668 struct thread_info
*event_thread
;
2669 struct lwp_info
*event_child
, *requested_child
;
2670 sigset_t block_mask
, prev_mask
;
2673 /* N.B. event_thread points to the thread_info struct that contains
2674 event_child. Keep them in sync. */
2675 event_thread
= NULL
;
2677 requested_child
= NULL
;
2679 /* Check for a lwp with a pending status. */
2681 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2683 event_thread
= (struct thread_info
*)
2684 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2685 if (event_thread
!= NULL
)
2686 event_child
= get_thread_lwp (event_thread
);
2687 if (debug_threads
&& event_thread
)
2688 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2690 else if (!ptid_equal (filter_ptid
, null_ptid
))
2692 requested_child
= find_lwp_pid (filter_ptid
);
2694 if (stopping_threads
== NOT_STOPPING_THREADS
2695 && requested_child
->status_pending_p
2696 && requested_child
->collecting_fast_tracepoint
)
2698 enqueue_one_deferred_signal (requested_child
,
2699 &requested_child
->status_pending
);
2700 requested_child
->status_pending_p
= 0;
2701 requested_child
->status_pending
= 0;
2702 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2705 if (requested_child
->suspended
2706 && requested_child
->status_pending_p
)
2708 internal_error (__FILE__
, __LINE__
,
2709 "requesting an event out of a"
2710 " suspended child?");
2713 if (requested_child
->status_pending_p
)
2715 event_child
= requested_child
;
2716 event_thread
= get_lwp_thread (event_child
);
2720 if (event_child
!= NULL
)
2723 debug_printf ("Got an event from pending child %ld (%04x)\n",
2724 lwpid_of (event_thread
), event_child
->status_pending
);
2725 *wstatp
= event_child
->status_pending
;
2726 event_child
->status_pending_p
= 0;
2727 event_child
->status_pending
= 0;
2728 current_thread
= event_thread
;
2729 return lwpid_of (event_thread
);
2732 /* But if we don't find a pending event, we'll have to wait.
2734 We only enter this loop if no process has a pending wait status.
2735 Thus any action taken in response to a wait status inside this
2736 loop is responding as soon as we detect the status, not after any
2739 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2740 all signals while here. */
2741 sigfillset (&block_mask
);
2742 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2744 /* Always pull all events out of the kernel. We'll randomly select
2745 an event LWP out of all that have events, to prevent
2747 while (event_child
== NULL
)
2751 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2754 - If the thread group leader exits while other threads in the
2755 thread group still exist, waitpid(TGID, ...) hangs. That
2756 waitpid won't return an exit status until the other threads
2757 in the group are reaped.
2759 - When a non-leader thread execs, that thread just vanishes
2760 without reporting an exit (so we'd hang if we waited for it
2761 explicitly in that case). The exec event is reported to
2764 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2767 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2768 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2774 debug_printf ("LLW: waitpid %ld received %s\n",
2775 (long) ret
, status_to_str (*wstatp
));
2778 /* Filter all events. IOW, leave all events pending. We'll
2779 randomly select an event LWP out of all that have events
2781 linux_low_filter_event (ret
, *wstatp
);
2782 /* Retry until nothing comes out of waitpid. A single
2783 SIGCHLD can indicate more than one child stopped. */
2787 /* Now that we've pulled all events out of the kernel, resume
2788 LWPs that don't have an interesting event to report. */
2789 if (stopping_threads
== NOT_STOPPING_THREADS
)
2790 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2792 /* ... and find an LWP with a status to report to the core, if
2794 event_thread
= (struct thread_info
*)
2795 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2796 if (event_thread
!= NULL
)
2798 event_child
= get_thread_lwp (event_thread
);
2799 *wstatp
= event_child
->status_pending
;
2800 event_child
->status_pending_p
= 0;
2801 event_child
->status_pending
= 0;
2805 /* Check for zombie thread group leaders. Those can't be reaped
2806 until all other threads in the thread group are. */
2807 check_zombie_leaders ();
2809 /* If there are no resumed children left in the set of LWPs we
2810 want to wait for, bail. We can't just block in
2811 waitpid/sigsuspend, because lwps might have been left stopped
2812 in trace-stop state, and we'd be stuck forever waiting for
2813 their status to change (which would only happen if we resumed
2814 them). Even if WNOHANG is set, this return code is preferred
2815 over 0 (below), as it is more detailed. */
2816 if ((find_inferior (&all_threads
,
2817 not_stopped_callback
,
2818 &wait_ptid
) == NULL
))
2821 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2822 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2826 /* No interesting event to report to the caller. */
2827 if ((options
& WNOHANG
))
2830 debug_printf ("WNOHANG set, no event found\n");
2832 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2836 /* Block until we get an event reported with SIGCHLD. */
2838 debug_printf ("sigsuspend'ing\n");
2840 sigsuspend (&prev_mask
);
2841 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2845 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2847 current_thread
= event_thread
;
2849 return lwpid_of (event_thread
);
2852 /* Wait for an event from child(ren) PTID. PTIDs can be:
2853 minus_one_ptid, to specify any child; a pid PTID, specifying all
2854 lwps of a thread group; or a PTID representing a single lwp. Store
2855 the stop status through the status pointer WSTAT. OPTIONS is
2856 passed to the waitpid call. Return 0 if no event was found and
2857 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2858 was found. Return the PID of the stopped child otherwise. */
2861 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2863 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2866 /* Count the LWP's that have had events. */
2869 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2871 struct thread_info
*thread
= (struct thread_info
*) entry
;
2872 struct lwp_info
*lp
= get_thread_lwp (thread
);
2873 int *count
= (int *) data
;
2875 gdb_assert (count
!= NULL
);
2877 /* Count only resumed LWPs that have an event pending. */
2878 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2879 && lp
->status_pending_p
)
2885 /* Select the LWP (if any) that is currently being single-stepped. */
2888 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2890 struct thread_info
*thread
= (struct thread_info
*) entry
;
2891 struct lwp_info
*lp
= get_thread_lwp (thread
);
2893 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2894 && thread
->last_resume_kind
== resume_step
2895 && lp
->status_pending_p
)
2901 /* Select the Nth LWP that has had an event. */
2904 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2906 struct thread_info
*thread
= (struct thread_info
*) entry
;
2907 struct lwp_info
*lp
= get_thread_lwp (thread
);
2908 int *selector
= (int *) data
;
2910 gdb_assert (selector
!= NULL
);
2912 /* Select only resumed LWPs that have an event pending. */
2913 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2914 && lp
->status_pending_p
)
2915 if ((*selector
)-- == 0)
2921 /* Select one LWP out of those that have events pending. */
2924 select_event_lwp (struct lwp_info
**orig_lp
)
2927 int random_selector
;
2928 struct thread_info
*event_thread
= NULL
;
2930 /* In all-stop, give preference to the LWP that is being
2931 single-stepped. There will be at most one, and it's the LWP that
2932 the core is most interested in. If we didn't do this, then we'd
2933 have to handle pending step SIGTRAPs somehow in case the core
2934 later continues the previously-stepped thread, otherwise we'd
2935 report the pending SIGTRAP, and the core, not having stepped the
2936 thread, wouldn't understand what the trap was for, and therefore
2937 would report it to the user as a random signal. */
2941 = (struct thread_info
*) find_inferior (&all_threads
,
2942 select_singlestep_lwp_callback
,
2944 if (event_thread
!= NULL
)
2947 debug_printf ("SEL: Select single-step %s\n",
2948 target_pid_to_str (ptid_of (event_thread
)));
2951 if (event_thread
== NULL
)
2953 /* No single-stepping LWP. Select one at random, out of those
2954 which have had events. */
2956 /* First see how many events we have. */
2957 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2958 gdb_assert (num_events
> 0);
2960 /* Now randomly pick a LWP out of those that have had
2962 random_selector
= (int)
2963 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2965 if (debug_threads
&& num_events
> 1)
2966 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2967 num_events
, random_selector
);
2970 = (struct thread_info
*) find_inferior (&all_threads
,
2971 select_event_lwp_callback
,
2975 if (event_thread
!= NULL
)
2977 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2979 /* Switch the event LWP. */
2980 *orig_lp
= event_lp
;
2984 /* Decrement the suspend count of an LWP. */
2987 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2989 struct thread_info
*thread
= (struct thread_info
*) entry
;
2990 struct lwp_info
*lwp
= get_thread_lwp (thread
);
2992 /* Ignore EXCEPT. */
2996 lwp_suspended_decr (lwp
);
3000 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
3004 unsuspend_all_lwps (struct lwp_info
*except
)
3006 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
3009 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
3010 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
3012 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
3013 static ptid_t
linux_wait_1 (ptid_t ptid
,
3014 struct target_waitstatus
*ourstatus
,
3015 int target_options
);
3017 /* Stabilize threads (move out of jump pads).
3019 If a thread is midway collecting a fast tracepoint, we need to
3020 finish the collection and move it out of the jump pad before
3021 reporting the signal.
3023 This avoids recursion while collecting (when a signal arrives
3024 midway, and the signal handler itself collects), which would trash
3025 the trace buffer. In case the user set a breakpoint in a signal
3026 handler, this avoids the backtrace showing the jump pad, etc..
3027 Most importantly, there are certain things we can't do safely if
3028 threads are stopped in a jump pad (or in its callee's). For
3031 - starting a new trace run. A thread still collecting the
3032 previous run, could trash the trace buffer when resumed. The trace
3033 buffer control structures would have been reset but the thread had
3034 no way to tell. The thread could even midway memcpy'ing to the
3035 buffer, which would mean that when resumed, it would clobber the
3036 trace buffer that had been set for a new run.
3038 - we can't rewrite/reuse the jump pads for new tracepoints
3039 safely. Say you do tstart while a thread is stopped midway while
3040 collecting. When the thread is later resumed, it finishes the
3041 collection, and returns to the jump pad, to execute the original
3042 instruction that was under the tracepoint jump at the time the
3043 older run had been started. If the jump pad had been rewritten
3044 since for something else in the new run, the thread would now
3045 execute the wrong / random instructions. */
3048 linux_stabilize_threads (void)
3050 struct thread_info
*saved_thread
;
3051 struct thread_info
*thread_stuck
;
3054 = (struct thread_info
*) find_inferior (&all_threads
,
3055 stuck_in_jump_pad_callback
,
3057 if (thread_stuck
!= NULL
)
3060 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
3061 lwpid_of (thread_stuck
));
3065 saved_thread
= current_thread
;
3067 stabilizing_threads
= 1;
3070 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
3072 /* Loop until all are stopped out of the jump pads. */
3073 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
3075 struct target_waitstatus ourstatus
;
3076 struct lwp_info
*lwp
;
3079 /* Note that we go through the full wait even loop. While
3080 moving threads out of jump pad, we need to be able to step
3081 over internal breakpoints and such. */
3082 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
3084 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
3086 lwp
= get_thread_lwp (current_thread
);
3089 lwp_suspended_inc (lwp
);
3091 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
3092 || current_thread
->last_resume_kind
== resume_stop
)
3094 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
3095 enqueue_one_deferred_signal (lwp
, &wstat
);
3100 unsuspend_all_lwps (NULL
);
3102 stabilizing_threads
= 0;
3104 current_thread
= saved_thread
;
3109 = (struct thread_info
*) find_inferior (&all_threads
,
3110 stuck_in_jump_pad_callback
,
3112 if (thread_stuck
!= NULL
)
3113 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3114 lwpid_of (thread_stuck
));
3118 /* Convenience function that is called when the kernel reports an
3119 event that is not passed out to GDB. */
3122 ignore_event (struct target_waitstatus
*ourstatus
)
3124 /* If we got an event, there may still be others, as a single
3125 SIGCHLD can indicate more than one child stopped. This forces
3126 another target_wait call. */
3129 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3133 /* Convenience function that is called when the kernel reports an exit
3134 event. This decides whether to report the event to GDB as a
3135 process exit event, a thread exit event, or to suppress the
3139 filter_exit_event (struct lwp_info
*event_child
,
3140 struct target_waitstatus
*ourstatus
)
3142 struct thread_info
*thread
= get_lwp_thread (event_child
);
3143 ptid_t ptid
= ptid_of (thread
);
3145 if (!last_thread_of_process_p (pid_of (thread
)))
3147 if (report_thread_events
)
3148 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
3150 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3152 delete_lwp (event_child
);
3157 /* Returns 1 if GDB is interested in any event_child syscalls. */
3160 gdb_catching_syscalls_p (struct lwp_info
*event_child
)
3162 struct thread_info
*thread
= get_lwp_thread (event_child
);
3163 struct process_info
*proc
= get_thread_process (thread
);
3165 return !VEC_empty (int, proc
->syscalls_to_catch
);
3168 /* Returns 1 if GDB is interested in the event_child syscall.
3169 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3172 gdb_catch_this_syscall_p (struct lwp_info
*event_child
)
3176 struct thread_info
*thread
= get_lwp_thread (event_child
);
3177 struct process_info
*proc
= get_thread_process (thread
);
3179 if (VEC_empty (int, proc
->syscalls_to_catch
))
3182 if (VEC_index (int, proc
->syscalls_to_catch
, 0) == ANY_SYSCALL
)
3185 get_syscall_trapinfo (event_child
, &sysno
);
3187 VEC_iterate (int, proc
->syscalls_to_catch
, i
, iter
);
3195 /* Wait for process, returns status. */
3198 linux_wait_1 (ptid_t ptid
,
3199 struct target_waitstatus
*ourstatus
, int target_options
)
3202 struct lwp_info
*event_child
;
3205 int step_over_finished
;
3206 int bp_explains_trap
;
3207 int maybe_internal_trap
;
3216 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
3219 /* Translate generic target options into linux options. */
3221 if (target_options
& TARGET_WNOHANG
)
3224 bp_explains_trap
= 0;
3227 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3229 /* Find a resumed LWP, if any. */
3230 if (find_inferior (&all_threads
,
3231 status_pending_p_callback
,
3232 &minus_one_ptid
) != NULL
)
3234 else if ((find_inferior (&all_threads
,
3235 not_stopped_callback
,
3236 &minus_one_ptid
) != NULL
))
3241 if (ptid_equal (step_over_bkpt
, null_ptid
))
3242 pid
= linux_wait_for_event (ptid
, &w
, options
);
3246 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3247 target_pid_to_str (step_over_bkpt
));
3248 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
3251 if (pid
== 0 || (pid
== -1 && !any_resumed
))
3253 gdb_assert (target_options
& TARGET_WNOHANG
);
3257 debug_printf ("linux_wait_1 ret = null_ptid, "
3258 "TARGET_WAITKIND_IGNORE\n");
3262 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3269 debug_printf ("linux_wait_1 ret = null_ptid, "
3270 "TARGET_WAITKIND_NO_RESUMED\n");
3274 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3278 event_child
= get_thread_lwp (current_thread
);
3280 /* linux_wait_for_event only returns an exit status for the last
3281 child of a process. Report it. */
3282 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3286 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3287 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3291 debug_printf ("linux_wait_1 ret = %s, exited with "
3293 target_pid_to_str (ptid_of (current_thread
)),
3300 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3301 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3305 debug_printf ("linux_wait_1 ret = %s, terminated with "
3307 target_pid_to_str (ptid_of (current_thread
)),
3313 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3314 return filter_exit_event (event_child
, ourstatus
);
3316 return ptid_of (current_thread
);
3319 /* If step-over executes a breakpoint instruction, in the case of a
3320 hardware single step it means a gdb/gdbserver breakpoint had been
3321 planted on top of a permanent breakpoint, in the case of a software
3322 single step it may just mean that gdbserver hit the reinsert breakpoint.
3323 The PC has been adjusted by save_stop_reason to point at
3324 the breakpoint address.
3325 So in the case of the hardware single step advance the PC manually
3326 past the breakpoint and in the case of software single step advance only
3327 if it's not the reinsert_breakpoint we are hitting.
3328 This avoids that a program would keep trapping a permanent breakpoint
3330 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3331 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3332 && (event_child
->stepping
3333 || !reinsert_breakpoint_inserted_here (event_child
->stop_pc
)))
3335 int increment_pc
= 0;
3336 int breakpoint_kind
= 0;
3337 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3340 the_target
->breakpoint_kind_from_current_state (&stop_pc
);
3341 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3345 debug_printf ("step-over for %s executed software breakpoint\n",
3346 target_pid_to_str (ptid_of (current_thread
)));
3349 if (increment_pc
!= 0)
3351 struct regcache
*regcache
3352 = get_thread_regcache (current_thread
, 1);
3354 event_child
->stop_pc
+= increment_pc
;
3355 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3357 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3358 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3362 /* If this event was not handled before, and is not a SIGTRAP, we
3363 report it. SIGILL and SIGSEGV are also treated as traps in case
3364 a breakpoint is inserted at the current PC. If this target does
3365 not support internal breakpoints at all, we also report the
3366 SIGTRAP without further processing; it's of no concern to us. */
3368 = (supports_breakpoints ()
3369 && (WSTOPSIG (w
) == SIGTRAP
3370 || ((WSTOPSIG (w
) == SIGILL
3371 || WSTOPSIG (w
) == SIGSEGV
)
3372 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3374 if (maybe_internal_trap
)
3376 /* Handle anything that requires bookkeeping before deciding to
3377 report the event or continue waiting. */
3379 /* First check if we can explain the SIGTRAP with an internal
3380 breakpoint, or if we should possibly report the event to GDB.
3381 Do this before anything that may remove or insert a
3383 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3385 /* We have a SIGTRAP, possibly a step-over dance has just
3386 finished. If so, tweak the state machine accordingly,
3387 reinsert breakpoints and delete any reinsert (software
3388 single-step) breakpoints. */
3389 step_over_finished
= finish_step_over (event_child
);
3391 /* Now invoke the callbacks of any internal breakpoints there. */
3392 check_breakpoints (event_child
->stop_pc
);
3394 /* Handle tracepoint data collecting. This may overflow the
3395 trace buffer, and cause a tracing stop, removing
3397 trace_event
= handle_tracepoints (event_child
);
3399 if (bp_explains_trap
)
3402 debug_printf ("Hit a gdbserver breakpoint.\n");
3407 /* We have some other signal, possibly a step-over dance was in
3408 progress, and it should be cancelled too. */
3409 step_over_finished
= finish_step_over (event_child
);
3412 /* We have all the data we need. Either report the event to GDB, or
3413 resume threads and keep waiting for more. */
3415 /* If we're collecting a fast tracepoint, finish the collection and
3416 move out of the jump pad before delivering a signal. See
3417 linux_stabilize_threads. */
3420 && WSTOPSIG (w
) != SIGTRAP
3421 && supports_fast_tracepoints ()
3422 && agent_loaded_p ())
3425 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3426 "to defer or adjust it.\n",
3427 WSTOPSIG (w
), lwpid_of (current_thread
));
3429 /* Allow debugging the jump pad itself. */
3430 if (current_thread
->last_resume_kind
!= resume_step
3431 && maybe_move_out_of_jump_pad (event_child
, &w
))
3433 enqueue_one_deferred_signal (event_child
, &w
);
3436 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3437 WSTOPSIG (w
), lwpid_of (current_thread
));
3439 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3441 return ignore_event (ourstatus
);
3445 if (event_child
->collecting_fast_tracepoint
)
3448 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3449 "Check if we're already there.\n",
3450 lwpid_of (current_thread
),
3451 event_child
->collecting_fast_tracepoint
);
3455 event_child
->collecting_fast_tracepoint
3456 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3458 if (event_child
->collecting_fast_tracepoint
!= 1)
3460 /* No longer need this breakpoint. */
3461 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3464 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3465 "stopping all threads momentarily.\n");
3467 /* Other running threads could hit this breakpoint.
3468 We don't handle moribund locations like GDB does,
3469 instead we always pause all threads when removing
3470 breakpoints, so that any step-over or
3471 decr_pc_after_break adjustment is always taken
3472 care of while the breakpoint is still
3474 stop_all_lwps (1, event_child
);
3476 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3477 event_child
->exit_jump_pad_bkpt
= NULL
;
3479 unstop_all_lwps (1, event_child
);
3481 gdb_assert (event_child
->suspended
>= 0);
3485 if (event_child
->collecting_fast_tracepoint
== 0)
3488 debug_printf ("fast tracepoint finished "
3489 "collecting successfully.\n");
3491 /* We may have a deferred signal to report. */
3492 if (dequeue_one_deferred_signal (event_child
, &w
))
3495 debug_printf ("dequeued one signal.\n");
3500 debug_printf ("no deferred signals.\n");
3502 if (stabilizing_threads
)
3504 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3505 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3509 debug_printf ("linux_wait_1 ret = %s, stopped "
3510 "while stabilizing threads\n",
3511 target_pid_to_str (ptid_of (current_thread
)));
3515 return ptid_of (current_thread
);
3521 /* Check whether GDB would be interested in this event. */
3523 /* Check if GDB is interested in this syscall. */
3525 && WSTOPSIG (w
) == SYSCALL_SIGTRAP
3526 && !gdb_catch_this_syscall_p (event_child
))
3530 debug_printf ("Ignored syscall for LWP %ld.\n",
3531 lwpid_of (current_thread
));
3534 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3536 return ignore_event (ourstatus
);
3539 /* If GDB is not interested in this signal, don't stop other
3540 threads, and don't report it to GDB. Just resume the inferior
3541 right away. We do this for threading-related signals as well as
3542 any that GDB specifically requested we ignore. But never ignore
3543 SIGSTOP if we sent it ourselves, and do not ignore signals when
3544 stepping - they may require special handling to skip the signal
3545 handler. Also never ignore signals that could be caused by a
3548 && current_thread
->last_resume_kind
!= resume_step
3550 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3551 (current_process ()->priv
->thread_db
!= NULL
3552 && (WSTOPSIG (w
) == __SIGRTMIN
3553 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3556 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3557 && !(WSTOPSIG (w
) == SIGSTOP
3558 && current_thread
->last_resume_kind
== resume_stop
)
3559 && !linux_wstatus_maybe_breakpoint (w
))))
3561 siginfo_t info
, *info_p
;
3564 debug_printf ("Ignored signal %d for LWP %ld.\n",
3565 WSTOPSIG (w
), lwpid_of (current_thread
));
3567 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3568 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3573 if (step_over_finished
)
3575 /* We cancelled this thread's step-over above. We still
3576 need to unsuspend all other LWPs, and set them back
3577 running again while the signal handler runs. */
3578 unsuspend_all_lwps (event_child
);
3580 /* Enqueue the pending signal info so that proceed_all_lwps
3582 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3584 proceed_all_lwps ();
3588 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3589 WSTOPSIG (w
), info_p
);
3591 return ignore_event (ourstatus
);
3594 /* Note that all addresses are always "out of the step range" when
3595 there's no range to begin with. */
3596 in_step_range
= lwp_in_step_range (event_child
);
3598 /* If GDB wanted this thread to single step, and the thread is out
3599 of the step range, we always want to report the SIGTRAP, and let
3600 GDB handle it. Watchpoints should always be reported. So should
3601 signals we can't explain. A SIGTRAP we can't explain could be a
3602 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3603 do, we're be able to handle GDB breakpoints on top of internal
3604 breakpoints, by handling the internal breakpoint and still
3605 reporting the event to GDB. If we don't, we're out of luck, GDB
3606 won't see the breakpoint hit. If we see a single-step event but
3607 the thread should be continuing, don't pass the trap to gdb.
3608 That indicates that we had previously finished a single-step but
3609 left the single-step pending -- see
3610 complete_ongoing_step_over. */
3611 report_to_gdb
= (!maybe_internal_trap
3612 || (current_thread
->last_resume_kind
== resume_step
3614 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3616 && !bp_explains_trap
3618 && !step_over_finished
3619 && !(current_thread
->last_resume_kind
== resume_continue
3620 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3621 || (gdb_breakpoint_here (event_child
->stop_pc
)
3622 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3623 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3624 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3626 run_breakpoint_commands (event_child
->stop_pc
);
3628 /* We found no reason GDB would want us to stop. We either hit one
3629 of our own breakpoints, or finished an internal step GDB
3630 shouldn't know about. */
3635 if (bp_explains_trap
)
3636 debug_printf ("Hit a gdbserver breakpoint.\n");
3637 if (step_over_finished
)
3638 debug_printf ("Step-over finished.\n");
3640 debug_printf ("Tracepoint event.\n");
3641 if (lwp_in_step_range (event_child
))
3642 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3643 paddress (event_child
->stop_pc
),
3644 paddress (event_child
->step_range_start
),
3645 paddress (event_child
->step_range_end
));
3648 /* We're not reporting this breakpoint to GDB, so apply the
3649 decr_pc_after_break adjustment to the inferior's regcache
3652 if (the_low_target
.set_pc
!= NULL
)
3654 struct regcache
*regcache
3655 = get_thread_regcache (current_thread
, 1);
3656 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3659 /* We may have finished stepping over a breakpoint. If so,
3660 we've stopped and suspended all LWPs momentarily except the
3661 stepping one. This is where we resume them all again. We're
3662 going to keep waiting, so use proceed, which handles stepping
3663 over the next breakpoint. */
3665 debug_printf ("proceeding all threads.\n");
3667 if (step_over_finished
)
3668 unsuspend_all_lwps (event_child
);
3670 proceed_all_lwps ();
3671 return ignore_event (ourstatus
);
3676 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3680 str
= target_waitstatus_to_string (&event_child
->waitstatus
);
3681 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3682 lwpid_of (get_lwp_thread (event_child
)), str
);
3685 if (current_thread
->last_resume_kind
== resume_step
)
3687 if (event_child
->step_range_start
== event_child
->step_range_end
)
3688 debug_printf ("GDB wanted to single-step, reporting event.\n");
3689 else if (!lwp_in_step_range (event_child
))
3690 debug_printf ("Out of step range, reporting event.\n");
3692 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3693 debug_printf ("Stopped by watchpoint.\n");
3694 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3695 debug_printf ("Stopped by GDB breakpoint.\n");
3697 debug_printf ("Hit a non-gdbserver trap event.\n");
3700 /* Alright, we're going to report a stop. */
3702 if (!stabilizing_threads
)
3704 /* In all-stop, stop all threads. */
3706 stop_all_lwps (0, NULL
);
3708 /* If we're not waiting for a specific LWP, choose an event LWP
3709 from among those that have had events. Giving equal priority
3710 to all LWPs that have had events helps prevent
3712 if (ptid_equal (ptid
, minus_one_ptid
))
3714 event_child
->status_pending_p
= 1;
3715 event_child
->status_pending
= w
;
3717 select_event_lwp (&event_child
);
3719 /* current_thread and event_child must stay in sync. */
3720 current_thread
= get_lwp_thread (event_child
);
3722 event_child
->status_pending_p
= 0;
3723 w
= event_child
->status_pending
;
3726 if (step_over_finished
)
3730 /* If we were doing a step-over, all other threads but
3731 the stepping one had been paused in start_step_over,
3732 with their suspend counts incremented. We don't want
3733 to do a full unstop/unpause, because we're in
3734 all-stop mode (so we want threads stopped), but we
3735 still need to unsuspend the other threads, to
3736 decrement their `suspended' count back. */
3737 unsuspend_all_lwps (event_child
);
3741 /* If we just finished a step-over, then all threads had
3742 been momentarily paused. In all-stop, that's fine,
3743 we want threads stopped by now anyway. In non-stop,
3744 we need to re-resume threads that GDB wanted to be
3746 unstop_all_lwps (1, event_child
);
3750 /* Stabilize threads (move out of jump pads). */
3752 stabilize_threads ();
3756 /* If we just finished a step-over, then all threads had been
3757 momentarily paused. In all-stop, that's fine, we want
3758 threads stopped by now anyway. In non-stop, we need to
3759 re-resume threads that GDB wanted to be running. */
3760 if (step_over_finished
)
3761 unstop_all_lwps (1, event_child
);
3764 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3766 /* If the reported event is an exit, fork, vfork or exec, let
3768 *ourstatus
= event_child
->waitstatus
;
3769 /* Clear the event lwp's waitstatus since we handled it already. */
3770 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3773 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3775 /* Now that we've selected our final event LWP, un-adjust its PC if
3776 it was a software breakpoint, and the client doesn't know we can
3777 adjust the breakpoint ourselves. */
3778 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3779 && !swbreak_feature
)
3781 int decr_pc
= the_low_target
.decr_pc_after_break
;
3785 struct regcache
*regcache
3786 = get_thread_regcache (current_thread
, 1);
3787 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3791 if (WSTOPSIG (w
) == SYSCALL_SIGTRAP
)
3793 get_syscall_trapinfo (event_child
,
3794 &ourstatus
->value
.syscall_number
);
3795 ourstatus
->kind
= event_child
->syscall_state
;
3797 else if (current_thread
->last_resume_kind
== resume_stop
3798 && WSTOPSIG (w
) == SIGSTOP
)
3800 /* A thread that has been requested to stop by GDB with vCont;t,
3801 and it stopped cleanly, so report as SIG0. The use of
3802 SIGSTOP is an implementation detail. */
3803 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3805 else if (current_thread
->last_resume_kind
== resume_stop
3806 && WSTOPSIG (w
) != SIGSTOP
)
3808 /* A thread that has been requested to stop by GDB with vCont;t,
3809 but, it stopped for other reasons. */
3810 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3812 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3814 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3817 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3821 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3822 target_pid_to_str (ptid_of (current_thread
)),
3823 ourstatus
->kind
, ourstatus
->value
.sig
);
3827 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3828 return filter_exit_event (event_child
, ourstatus
);
3830 return ptid_of (current_thread
);
3833 /* Get rid of any pending event in the pipe. */
3835 async_file_flush (void)
3841 ret
= read (linux_event_pipe
[0], &buf
, 1);
3842 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3845 /* Put something in the pipe, so the event loop wakes up. */
3847 async_file_mark (void)
3851 async_file_flush ();
3854 ret
= write (linux_event_pipe
[1], "+", 1);
3855 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3857 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3858 be awakened anyway. */
3862 linux_wait (ptid_t ptid
,
3863 struct target_waitstatus
*ourstatus
, int target_options
)
3867 /* Flush the async file first. */
3868 if (target_is_async_p ())
3869 async_file_flush ();
3873 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3875 while ((target_options
& TARGET_WNOHANG
) == 0
3876 && ptid_equal (event_ptid
, null_ptid
)
3877 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3879 /* If at least one stop was reported, there may be more. A single
3880 SIGCHLD can signal more than one child stop. */
3881 if (target_is_async_p ()
3882 && (target_options
& TARGET_WNOHANG
) != 0
3883 && !ptid_equal (event_ptid
, null_ptid
))
3889 /* Send a signal to an LWP. */
3892 kill_lwp (unsigned long lwpid
, int signo
)
3897 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3898 if (errno
== ENOSYS
)
3900 /* If tkill fails, then we are not using nptl threads, a
3901 configuration we no longer support. */
3902 perror_with_name (("tkill"));
3908 linux_stop_lwp (struct lwp_info
*lwp
)
3914 send_sigstop (struct lwp_info
*lwp
)
3918 pid
= lwpid_of (get_lwp_thread (lwp
));
3920 /* If we already have a pending stop signal for this process, don't
3922 if (lwp
->stop_expected
)
3925 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3931 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3933 lwp
->stop_expected
= 1;
3934 kill_lwp (pid
, SIGSTOP
);
3938 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
3940 struct thread_info
*thread
= (struct thread_info
*) entry
;
3941 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3943 /* Ignore EXCEPT. */
3954 /* Increment the suspend count of an LWP, and stop it, if not stopped
3957 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
3960 struct thread_info
*thread
= (struct thread_info
*) entry
;
3961 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3963 /* Ignore EXCEPT. */
3967 lwp_suspended_inc (lwp
);
3969 return send_sigstop_callback (entry
, except
);
3973 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3975 /* Store the exit status for later. */
3976 lwp
->status_pending_p
= 1;
3977 lwp
->status_pending
= wstat
;
3979 /* Store in waitstatus as well, as there's nothing else to process
3981 if (WIFEXITED (wstat
))
3983 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
3984 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
3986 else if (WIFSIGNALED (wstat
))
3988 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
3989 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
3992 /* Prevent trying to stop it. */
3995 /* No further stops are expected from a dead lwp. */
3996 lwp
->stop_expected
= 0;
3999 /* Return true if LWP has exited already, and has a pending exit event
4000 to report to GDB. */
4003 lwp_is_marked_dead (struct lwp_info
*lwp
)
4005 return (lwp
->status_pending_p
4006 && (WIFEXITED (lwp
->status_pending
)
4007 || WIFSIGNALED (lwp
->status_pending
)));
4010 /* Wait for all children to stop for the SIGSTOPs we just queued. */
4013 wait_for_sigstop (void)
4015 struct thread_info
*saved_thread
;
4020 saved_thread
= current_thread
;
4021 if (saved_thread
!= NULL
)
4022 saved_tid
= saved_thread
->entry
.id
;
4024 saved_tid
= null_ptid
; /* avoid bogus unused warning */
4027 debug_printf ("wait_for_sigstop: pulling events\n");
4029 /* Passing NULL_PTID as filter indicates we want all events to be
4030 left pending. Eventually this returns when there are no
4031 unwaited-for children left. */
4032 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4034 gdb_assert (ret
== -1);
4036 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
4037 current_thread
= saved_thread
;
4041 debug_printf ("Previously current thread died.\n");
4043 /* We can't change the current inferior behind GDB's back,
4044 otherwise, a subsequent command may apply to the wrong
4046 current_thread
= NULL
;
4050 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
4051 move it out, because we need to report the stop event to GDB. For
4052 example, if the user puts a breakpoint in the jump pad, it's
4053 because she wants to debug it. */
4056 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
4058 struct thread_info
*thread
= (struct thread_info
*) entry
;
4059 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4061 if (lwp
->suspended
!= 0)
4063 internal_error (__FILE__
, __LINE__
,
4064 "LWP %ld is suspended, suspended=%d\n",
4065 lwpid_of (thread
), lwp
->suspended
);
4067 gdb_assert (lwp
->stopped
);
4069 /* Allow debugging the jump pad, gdb_collect, etc.. */
4070 return (supports_fast_tracepoints ()
4071 && agent_loaded_p ()
4072 && (gdb_breakpoint_here (lwp
->stop_pc
)
4073 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
4074 || thread
->last_resume_kind
== resume_step
)
4075 && linux_fast_tracepoint_collecting (lwp
, NULL
));
4079 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
4081 struct thread_info
*thread
= (struct thread_info
*) entry
;
4082 struct thread_info
*saved_thread
;
4083 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4086 if (lwp
->suspended
!= 0)
4088 internal_error (__FILE__
, __LINE__
,
4089 "LWP %ld is suspended, suspended=%d\n",
4090 lwpid_of (thread
), lwp
->suspended
);
4092 gdb_assert (lwp
->stopped
);
4094 /* For gdb_breakpoint_here. */
4095 saved_thread
= current_thread
;
4096 current_thread
= thread
;
4098 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
4100 /* Allow debugging the jump pad, gdb_collect, etc. */
4101 if (!gdb_breakpoint_here (lwp
->stop_pc
)
4102 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
4103 && thread
->last_resume_kind
!= resume_step
4104 && maybe_move_out_of_jump_pad (lwp
, wstat
))
4107 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4112 lwp
->status_pending_p
= 0;
4113 enqueue_one_deferred_signal (lwp
, wstat
);
4116 debug_printf ("Signal %d for LWP %ld deferred "
4118 WSTOPSIG (*wstat
), lwpid_of (thread
));
4121 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
4124 lwp_suspended_inc (lwp
);
4126 current_thread
= saved_thread
;
4130 lwp_running (struct inferior_list_entry
*entry
, void *data
)
4132 struct thread_info
*thread
= (struct thread_info
*) entry
;
4133 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4135 if (lwp_is_marked_dead (lwp
))
4142 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4143 If SUSPEND, then also increase the suspend count of every LWP,
4147 stop_all_lwps (int suspend
, struct lwp_info
*except
)
4149 /* Should not be called recursively. */
4150 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
4155 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4156 suspend
? "stop-and-suspend" : "stop",
4158 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
4162 stopping_threads
= (suspend
4163 ? STOPPING_AND_SUSPENDING_THREADS
4164 : STOPPING_THREADS
);
4167 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
4169 find_inferior (&all_threads
, send_sigstop_callback
, except
);
4170 wait_for_sigstop ();
4171 stopping_threads
= NOT_STOPPING_THREADS
;
4175 debug_printf ("stop_all_lwps done, setting stopping_threads "
4176 "back to !stopping\n");
4181 /* Enqueue one signal in the chain of signals which need to be
4182 delivered to this process on next resume. */
4185 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
4187 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
4189 p_sig
->prev
= lwp
->pending_signals
;
4190 p_sig
->signal
= signal
;
4192 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4194 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
4195 lwp
->pending_signals
= p_sig
;
4198 /* Install breakpoints for software single stepping. */
4201 install_software_single_step_breakpoints (struct lwp_info
*lwp
)
4205 struct thread_info
*thread
= get_lwp_thread (lwp
);
4206 struct regcache
*regcache
= get_thread_regcache (thread
, 1);
4207 VEC (CORE_ADDR
) *next_pcs
= NULL
;
4208 struct cleanup
*old_chain
= make_cleanup_restore_current_thread ();
4210 make_cleanup (VEC_cleanup (CORE_ADDR
), &next_pcs
);
4212 current_thread
= thread
;
4213 next_pcs
= (*the_low_target
.get_next_pcs
) (regcache
);
4215 for (i
= 0; VEC_iterate (CORE_ADDR
, next_pcs
, i
, pc
); ++i
)
4216 set_reinsert_breakpoint (pc
, current_ptid
);
4218 do_cleanups (old_chain
);
4221 /* Single step via hardware or software single step.
4222 Return 1 if hardware single stepping, 0 if software single stepping
4223 or can't single step. */
4226 single_step (struct lwp_info
* lwp
)
4230 if (can_hardware_single_step ())
4234 else if (can_software_single_step ())
4236 install_software_single_step_breakpoints (lwp
);
4242 debug_printf ("stepping is not implemented on this target");
4248 /* The signal can be delivered to the inferior if we are not trying to
4249 finish a fast tracepoint collect. Since signal can be delivered in
4250 the step-over, the program may go to signal handler and trap again
4251 after return from the signal handler. We can live with the spurious
4255 lwp_signal_can_be_delivered (struct lwp_info
*lwp
)
4257 return !lwp
->collecting_fast_tracepoint
;
4260 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4261 SIGNAL is nonzero, give it that signal. */
4264 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
4265 int step
, int signal
, siginfo_t
*info
)
4267 struct thread_info
*thread
= get_lwp_thread (lwp
);
4268 struct thread_info
*saved_thread
;
4269 int fast_tp_collecting
;
4271 struct process_info
*proc
= get_thread_process (thread
);
4273 /* Note that target description may not be initialised
4274 (proc->tdesc == NULL) at this point because the program hasn't
4275 stopped at the first instruction yet. It means GDBserver skips
4276 the extra traps from the wrapper program (see option --wrapper).
4277 Code in this function that requires register access should be
4278 guarded by proc->tdesc == NULL or something else. */
4280 if (lwp
->stopped
== 0)
4283 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
4285 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
4287 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
4289 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4290 user used the "jump" command, or "set $pc = foo"). */
4291 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
4293 /* Collecting 'while-stepping' actions doesn't make sense
4295 release_while_stepping_state_list (thread
);
4298 /* If we have pending signals or status, and a new signal, enqueue the
4299 signal. Also enqueue the signal if it can't be delivered to the
4300 inferior right now. */
4302 && (lwp
->status_pending_p
4303 || lwp
->pending_signals
!= NULL
4304 || !lwp_signal_can_be_delivered (lwp
)))
4306 enqueue_pending_signal (lwp
, signal
, info
);
4308 /* Postpone any pending signal. It was enqueued above. */
4312 if (lwp
->status_pending_p
)
4315 debug_printf ("Not resuming lwp %ld (%s, stop %s);"
4316 " has pending status\n",
4317 lwpid_of (thread
), step
? "step" : "continue",
4318 lwp
->stop_expected
? "expected" : "not expected");
4322 saved_thread
= current_thread
;
4323 current_thread
= thread
;
4325 /* This bit needs some thinking about. If we get a signal that
4326 we must report while a single-step reinsert is still pending,
4327 we often end up resuming the thread. It might be better to
4328 (ew) allow a stack of pending events; then we could be sure that
4329 the reinsert happened right away and not lose any signals.
4331 Making this stack would also shrink the window in which breakpoints are
4332 uninserted (see comment in linux_wait_for_lwp) but not enough for
4333 complete correctness, so it won't solve that problem. It may be
4334 worthwhile just to solve this one, however. */
4335 if (lwp
->bp_reinsert
!= 0)
4338 debug_printf (" pending reinsert at 0x%s\n",
4339 paddress (lwp
->bp_reinsert
));
4341 if (can_hardware_single_step ())
4343 if (fast_tp_collecting
== 0)
4346 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
4348 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
4353 step
= maybe_hw_step (thread
);
4357 /* If the thread isn't doing step-over, there shouldn't be any
4358 reinsert breakpoints. */
4359 gdb_assert (!has_reinsert_breakpoints (thread
));
4362 if (fast_tp_collecting
== 1)
4365 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4366 " (exit-jump-pad-bkpt)\n",
4369 else if (fast_tp_collecting
== 2)
4372 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4373 " single-stepping\n",
4376 if (can_hardware_single_step ())
4380 internal_error (__FILE__
, __LINE__
,
4381 "moving out of jump pad single-stepping"
4382 " not implemented on this target");
4386 /* If we have while-stepping actions in this thread set it stepping.
4387 If we have a signal to deliver, it may or may not be set to
4388 SIG_IGN, we don't know. Assume so, and allow collecting
4389 while-stepping into a signal handler. A possible smart thing to
4390 do would be to set an internal breakpoint at the signal return
4391 address, continue, and carry on catching this while-stepping
4392 action only when that breakpoint is hit. A future
4394 if (thread
->while_stepping
!= NULL
)
4397 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4400 step
= single_step (lwp
);
4403 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4405 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4407 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4411 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4412 (long) lwp
->stop_pc
);
4416 /* If we have pending signals, consume one if it can be delivered to
4418 if (lwp
->pending_signals
!= NULL
&& lwp_signal_can_be_delivered (lwp
))
4420 struct pending_signals
**p_sig
;
4422 p_sig
= &lwp
->pending_signals
;
4423 while ((*p_sig
)->prev
!= NULL
)
4424 p_sig
= &(*p_sig
)->prev
;
4426 signal
= (*p_sig
)->signal
;
4427 if ((*p_sig
)->info
.si_signo
!= 0)
4428 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4436 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4437 lwpid_of (thread
), step
? "step" : "continue", signal
,
4438 lwp
->stop_expected
? "expected" : "not expected");
4440 if (the_low_target
.prepare_to_resume
!= NULL
)
4441 the_low_target
.prepare_to_resume (lwp
);
4443 regcache_invalidate_thread (thread
);
4445 lwp
->stepping
= step
;
4447 ptrace_request
= PTRACE_SINGLESTEP
;
4448 else if (gdb_catching_syscalls_p (lwp
))
4449 ptrace_request
= PTRACE_SYSCALL
;
4451 ptrace_request
= PTRACE_CONT
;
4452 ptrace (ptrace_request
,
4454 (PTRACE_TYPE_ARG3
) 0,
4455 /* Coerce to a uintptr_t first to avoid potential gcc warning
4456 of coercing an 8 byte integer to a 4 byte pointer. */
4457 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4459 current_thread
= saved_thread
;
4461 perror_with_name ("resuming thread");
4463 /* Successfully resumed. Clear state that no longer makes sense,
4464 and mark the LWP as running. Must not do this before resuming
4465 otherwise if that fails other code will be confused. E.g., we'd
4466 later try to stop the LWP and hang forever waiting for a stop
4467 status. Note that we must not throw after this is cleared,
4468 otherwise handle_zombie_lwp_error would get confused. */
4470 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4473 /* Called when we try to resume a stopped LWP and that errors out. If
4474 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4475 or about to become), discard the error, clear any pending status
4476 the LWP may have, and return true (we'll collect the exit status
4477 soon enough). Otherwise, return false. */
4480 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4482 struct thread_info
*thread
= get_lwp_thread (lp
);
4484 /* If we get an error after resuming the LWP successfully, we'd
4485 confuse !T state for the LWP being gone. */
4486 gdb_assert (lp
->stopped
);
4488 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4489 because even if ptrace failed with ESRCH, the tracee may be "not
4490 yet fully dead", but already refusing ptrace requests. In that
4491 case the tracee has 'R (Running)' state for a little bit
4492 (observed in Linux 3.18). See also the note on ESRCH in the
4493 ptrace(2) man page. Instead, check whether the LWP has any state
4494 other than ptrace-stopped. */
4496 /* Don't assume anything if /proc/PID/status can't be read. */
4497 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4499 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4500 lp
->status_pending_p
= 0;
4506 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4507 disappears while we try to resume it. */
4510 linux_resume_one_lwp (struct lwp_info
*lwp
,
4511 int step
, int signal
, siginfo_t
*info
)
4515 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4517 CATCH (ex
, RETURN_MASK_ERROR
)
4519 if (!check_ptrace_stopped_lwp_gone (lwp
))
4520 throw_exception (ex
);
4525 struct thread_resume_array
4527 struct thread_resume
*resume
;
4531 /* This function is called once per thread via find_inferior.
4532 ARG is a pointer to a thread_resume_array struct.
4533 We look up the thread specified by ENTRY in ARG, and mark the thread
4534 with a pointer to the appropriate resume request.
4536 This algorithm is O(threads * resume elements), but resume elements
4537 is small (and will remain small at least until GDB supports thread
4541 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
4543 struct thread_info
*thread
= (struct thread_info
*) entry
;
4544 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4546 struct thread_resume_array
*r
;
4548 r
= (struct thread_resume_array
*) arg
;
4550 for (ndx
= 0; ndx
< r
->n
; ndx
++)
4552 ptid_t ptid
= r
->resume
[ndx
].thread
;
4553 if (ptid_equal (ptid
, minus_one_ptid
)
4554 || ptid_equal (ptid
, entry
->id
)
4555 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4557 || (ptid_get_pid (ptid
) == pid_of (thread
)
4558 && (ptid_is_pid (ptid
)
4559 || ptid_get_lwp (ptid
) == -1)))
4561 if (r
->resume
[ndx
].kind
== resume_stop
4562 && thread
->last_resume_kind
== resume_stop
)
4565 debug_printf ("already %s LWP %ld at GDB's request\n",
4566 (thread
->last_status
.kind
4567 == TARGET_WAITKIND_STOPPED
)
4575 lwp
->resume
= &r
->resume
[ndx
];
4576 thread
->last_resume_kind
= lwp
->resume
->kind
;
4578 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4579 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4581 /* If we had a deferred signal to report, dequeue one now.
4582 This can happen if LWP gets more than one signal while
4583 trying to get out of a jump pad. */
4585 && !lwp
->status_pending_p
4586 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4588 lwp
->status_pending_p
= 1;
4591 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4592 "leaving status pending.\n",
4593 WSTOPSIG (lwp
->status_pending
),
4601 /* No resume action for this thread. */
4607 /* find_inferior callback for linux_resume.
4608 Set *FLAG_P if this lwp has an interesting status pending. */
4611 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
4613 struct thread_info
*thread
= (struct thread_info
*) entry
;
4614 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4616 /* LWPs which will not be resumed are not interesting, because
4617 we might not wait for them next time through linux_wait. */
4618 if (lwp
->resume
== NULL
)
4621 if (thread_still_has_status_pending_p (thread
))
4622 * (int *) flag_p
= 1;
4627 /* Return 1 if this lwp that GDB wants running is stopped at an
4628 internal breakpoint that we need to step over. It assumes that any
4629 required STOP_PC adjustment has already been propagated to the
4630 inferior's regcache. */
4633 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
4635 struct thread_info
*thread
= (struct thread_info
*) entry
;
4636 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4637 struct thread_info
*saved_thread
;
4639 struct process_info
*proc
= get_thread_process (thread
);
4641 /* GDBserver is skipping the extra traps from the wrapper program,
4642 don't have to do step over. */
4643 if (proc
->tdesc
== NULL
)
4646 /* LWPs which will not be resumed are not interesting, because we
4647 might not wait for them next time through linux_wait. */
4652 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4657 if (thread
->last_resume_kind
== resume_stop
)
4660 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4666 gdb_assert (lwp
->suspended
>= 0);
4671 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4676 if (lwp
->status_pending_p
)
4679 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4685 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4689 /* If the PC has changed since we stopped, then don't do anything,
4690 and let the breakpoint/tracepoint be hit. This happens if, for
4691 instance, GDB handled the decr_pc_after_break subtraction itself,
4692 GDB is OOL stepping this thread, or the user has issued a "jump"
4693 command, or poked thread's registers herself. */
4694 if (pc
!= lwp
->stop_pc
)
4697 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4698 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4700 paddress (lwp
->stop_pc
), paddress (pc
));
4704 /* On software single step target, resume the inferior with signal
4705 rather than stepping over. */
4706 if (can_software_single_step ()
4707 && lwp
->pending_signals
!= NULL
4708 && lwp_signal_can_be_delivered (lwp
))
4711 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4718 saved_thread
= current_thread
;
4719 current_thread
= thread
;
4721 /* We can only step over breakpoints we know about. */
4722 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4724 /* Don't step over a breakpoint that GDB expects to hit
4725 though. If the condition is being evaluated on the target's side
4726 and it evaluate to false, step over this breakpoint as well. */
4727 if (gdb_breakpoint_here (pc
)
4728 && gdb_condition_true_at_breakpoint (pc
)
4729 && gdb_no_commands_at_breakpoint (pc
))
4732 debug_printf ("Need step over [LWP %ld]? yes, but found"
4733 " GDB breakpoint at 0x%s; skipping step over\n",
4734 lwpid_of (thread
), paddress (pc
));
4736 current_thread
= saved_thread
;
4742 debug_printf ("Need step over [LWP %ld]? yes, "
4743 "found breakpoint at 0x%s\n",
4744 lwpid_of (thread
), paddress (pc
));
4746 /* We've found an lwp that needs stepping over --- return 1 so
4747 that find_inferior stops looking. */
4748 current_thread
= saved_thread
;
4754 current_thread
= saved_thread
;
4757 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4759 lwpid_of (thread
), paddress (pc
));
4764 /* Start a step-over operation on LWP. When LWP stopped at a
4765 breakpoint, to make progress, we need to remove the breakpoint out
4766 of the way. If we let other threads run while we do that, they may
4767 pass by the breakpoint location and miss hitting it. To avoid
4768 that, a step-over momentarily stops all threads while LWP is
4769 single-stepped by either hardware or software while the breakpoint
4770 is temporarily uninserted from the inferior. When the single-step
4771 finishes, we reinsert the breakpoint, and let all threads that are
4772 supposed to be running, run again. */
4775 start_step_over (struct lwp_info
*lwp
)
4777 struct thread_info
*thread
= get_lwp_thread (lwp
);
4778 struct thread_info
*saved_thread
;
4783 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4786 stop_all_lwps (1, lwp
);
4788 if (lwp
->suspended
!= 0)
4790 internal_error (__FILE__
, __LINE__
,
4791 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4796 debug_printf ("Done stopping all threads for step-over.\n");
4798 /* Note, we should always reach here with an already adjusted PC,
4799 either by GDB (if we're resuming due to GDB's request), or by our
4800 caller, if we just finished handling an internal breakpoint GDB
4801 shouldn't care about. */
4804 saved_thread
= current_thread
;
4805 current_thread
= thread
;
4807 lwp
->bp_reinsert
= pc
;
4808 uninsert_breakpoints_at (pc
);
4809 uninsert_fast_tracepoint_jumps_at (pc
);
4811 step
= single_step (lwp
);
4813 current_thread
= saved_thread
;
4815 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4817 /* Require next event from this LWP. */
4818 step_over_bkpt
= thread
->entry
.id
;
4822 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4823 start_step_over, if still there, and delete any reinsert
4824 breakpoints we've set, on non hardware single-step targets. */
4827 finish_step_over (struct lwp_info
*lwp
)
4829 if (lwp
->bp_reinsert
!= 0)
4831 struct thread_info
*saved_thread
= current_thread
;
4834 debug_printf ("Finished step over.\n");
4836 current_thread
= get_lwp_thread (lwp
);
4838 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4839 may be no breakpoint to reinsert there by now. */
4840 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4841 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4843 lwp
->bp_reinsert
= 0;
4845 /* Delete any software-single-step reinsert breakpoints. No
4846 longer needed. We don't have to worry about other threads
4847 hitting this trap, and later not being able to explain it,
4848 because we were stepping over a breakpoint, and we hold all
4849 threads but LWP stopped while doing that. */
4850 if (!can_hardware_single_step ())
4852 gdb_assert (has_reinsert_breakpoints (current_thread
));
4853 delete_reinsert_breakpoints (current_thread
);
4856 step_over_bkpt
= null_ptid
;
4857 current_thread
= saved_thread
;
4864 /* If there's a step over in progress, wait until all threads stop
4865 (that is, until the stepping thread finishes its step), and
4866 unsuspend all lwps. The stepping thread ends with its status
4867 pending, which is processed later when we get back to processing
4871 complete_ongoing_step_over (void)
4873 if (!ptid_equal (step_over_bkpt
, null_ptid
))
4875 struct lwp_info
*lwp
;
4880 debug_printf ("detach: step over in progress, finish it first\n");
4882 /* Passing NULL_PTID as filter indicates we want all events to
4883 be left pending. Eventually this returns when there are no
4884 unwaited-for children left. */
4885 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4887 gdb_assert (ret
== -1);
4889 lwp
= find_lwp_pid (step_over_bkpt
);
4891 finish_step_over (lwp
);
4892 step_over_bkpt
= null_ptid
;
4893 unsuspend_all_lwps (lwp
);
4897 /* This function is called once per thread. We check the thread's resume
4898 request, which will tell us whether to resume, step, or leave the thread
4899 stopped; and what signal, if any, it should be sent.
4901 For threads which we aren't explicitly told otherwise, we preserve
4902 the stepping flag; this is used for stepping over gdbserver-placed
4905 If pending_flags was set in any thread, we queue any needed
4906 signals, since we won't actually resume. We already have a pending
4907 event to report, so we don't need to preserve any step requests;
4908 they should be re-issued if necessary. */
4911 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
4913 struct thread_info
*thread
= (struct thread_info
*) entry
;
4914 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4916 int leave_all_stopped
= * (int *) arg
;
4919 if (lwp
->resume
== NULL
)
4922 if (lwp
->resume
->kind
== resume_stop
)
4925 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4930 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
4932 /* Stop the thread, and wait for the event asynchronously,
4933 through the event loop. */
4939 debug_printf ("already stopped LWP %ld\n",
4942 /* The LWP may have been stopped in an internal event that
4943 was not meant to be notified back to GDB (e.g., gdbserver
4944 breakpoint), so we should be reporting a stop event in
4947 /* If the thread already has a pending SIGSTOP, this is a
4948 no-op. Otherwise, something later will presumably resume
4949 the thread and this will cause it to cancel any pending
4950 operation, due to last_resume_kind == resume_stop. If
4951 the thread already has a pending status to report, we
4952 will still report it the next time we wait - see
4953 status_pending_p_callback. */
4955 /* If we already have a pending signal to report, then
4956 there's no need to queue a SIGSTOP, as this means we're
4957 midway through moving the LWP out of the jumppad, and we
4958 will report the pending signal as soon as that is
4960 if (lwp
->pending_signals_to_report
== NULL
)
4964 /* For stop requests, we're done. */
4966 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4970 /* If this thread which is about to be resumed has a pending status,
4971 then don't resume it - we can just report the pending status.
4972 Likewise if it is suspended, because e.g., another thread is
4973 stepping past a breakpoint. Make sure to queue any signals that
4974 would otherwise be sent. In all-stop mode, we do this decision
4975 based on if *any* thread has a pending status. If there's a
4976 thread that needs the step-over-breakpoint dance, then don't
4977 resume any other thread but that particular one. */
4978 leave_pending
= (lwp
->suspended
4979 || lwp
->status_pending_p
4980 || leave_all_stopped
);
4985 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
4987 step
= (lwp
->resume
->kind
== resume_step
);
4988 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
4993 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
4995 /* If we have a new signal, enqueue the signal. */
4996 if (lwp
->resume
->sig
!= 0)
4998 struct pending_signals
*p_sig
= XCNEW (struct pending_signals
);
5000 p_sig
->prev
= lwp
->pending_signals
;
5001 p_sig
->signal
= lwp
->resume
->sig
;
5003 /* If this is the same signal we were previously stopped by,
5004 make sure to queue its siginfo. We can ignore the return
5005 value of ptrace; if it fails, we'll skip
5006 PTRACE_SETSIGINFO. */
5007 if (WIFSTOPPED (lwp
->last_status
)
5008 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
5009 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
5012 lwp
->pending_signals
= p_sig
;
5016 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
5022 linux_resume (struct thread_resume
*resume_info
, size_t n
)
5024 struct thread_resume_array array
= { resume_info
, n
};
5025 struct thread_info
*need_step_over
= NULL
;
5027 int leave_all_stopped
;
5032 debug_printf ("linux_resume:\n");
5035 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
5037 /* If there is a thread which would otherwise be resumed, which has
5038 a pending status, then don't resume any threads - we can just
5039 report the pending status. Make sure to queue any signals that
5040 would otherwise be sent. In non-stop mode, we'll apply this
5041 logic to each thread individually. We consume all pending events
5042 before considering to start a step-over (in all-stop). */
5045 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
5047 /* If there is a thread which would otherwise be resumed, which is
5048 stopped at a breakpoint that needs stepping over, then don't
5049 resume any threads - have it step over the breakpoint with all
5050 other threads stopped, then resume all threads again. Make sure
5051 to queue any signals that would otherwise be delivered or
5053 if (!any_pending
&& supports_breakpoints ())
5055 = (struct thread_info
*) find_inferior (&all_threads
,
5056 need_step_over_p
, NULL
);
5058 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
5062 if (need_step_over
!= NULL
)
5063 debug_printf ("Not resuming all, need step over\n");
5064 else if (any_pending
)
5065 debug_printf ("Not resuming, all-stop and found "
5066 "an LWP with pending status\n");
5068 debug_printf ("Resuming, no pending status or step over needed\n");
5071 /* Even if we're leaving threads stopped, queue all signals we'd
5072 otherwise deliver. */
5073 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
5076 start_step_over (get_thread_lwp (need_step_over
));
5080 debug_printf ("linux_resume done\n");
5084 /* We may have events that were pending that can/should be sent to
5085 the client now. Trigger a linux_wait call. */
5086 if (target_is_async_p ())
5090 /* This function is called once per thread. We check the thread's
5091 last resume request, which will tell us whether to resume, step, or
5092 leave the thread stopped. Any signal the client requested to be
5093 delivered has already been enqueued at this point.
5095 If any thread that GDB wants running is stopped at an internal
5096 breakpoint that needs stepping over, we start a step-over operation
5097 on that particular thread, and leave all others stopped. */
5100 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
5102 struct thread_info
*thread
= (struct thread_info
*) entry
;
5103 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5110 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
5115 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
5119 if (thread
->last_resume_kind
== resume_stop
5120 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
5123 debug_printf (" client wants LWP to remain %ld stopped\n",
5128 if (lwp
->status_pending_p
)
5131 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5136 gdb_assert (lwp
->suspended
>= 0);
5141 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
5145 if (thread
->last_resume_kind
== resume_stop
5146 && lwp
->pending_signals_to_report
== NULL
5147 && lwp
->collecting_fast_tracepoint
== 0)
5149 /* We haven't reported this LWP as stopped yet (otherwise, the
5150 last_status.kind check above would catch it, and we wouldn't
5151 reach here. This LWP may have been momentarily paused by a
5152 stop_all_lwps call while handling for example, another LWP's
5153 step-over. In that case, the pending expected SIGSTOP signal
5154 that was queued at vCont;t handling time will have already
5155 been consumed by wait_for_sigstop, and so we need to requeue
5156 another one here. Note that if the LWP already has a SIGSTOP
5157 pending, this is a no-op. */
5160 debug_printf ("Client wants LWP %ld to stop. "
5161 "Making sure it has a SIGSTOP pending\n",
5167 if (thread
->last_resume_kind
== resume_step
)
5170 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5174 else if (lwp
->bp_reinsert
!= 0)
5177 debug_printf (" stepping LWP %ld, reinsert set\n",
5180 step
= maybe_hw_step (thread
);
5185 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
5190 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
5192 struct thread_info
*thread
= (struct thread_info
*) entry
;
5193 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5198 lwp_suspended_decr (lwp
);
5200 return proceed_one_lwp (entry
, except
);
5203 /* When we finish a step-over, set threads running again. If there's
5204 another thread that may need a step-over, now's the time to start
5205 it. Eventually, we'll move all threads past their breakpoints. */
5208 proceed_all_lwps (void)
5210 struct thread_info
*need_step_over
;
5212 /* If there is a thread which would otherwise be resumed, which is
5213 stopped at a breakpoint that needs stepping over, then don't
5214 resume any threads - have it step over the breakpoint with all
5215 other threads stopped, then resume all threads again. */
5217 if (supports_breakpoints ())
5220 = (struct thread_info
*) find_inferior (&all_threads
,
5221 need_step_over_p
, NULL
);
5223 if (need_step_over
!= NULL
)
5226 debug_printf ("proceed_all_lwps: found "
5227 "thread %ld needing a step-over\n",
5228 lwpid_of (need_step_over
));
5230 start_step_over (get_thread_lwp (need_step_over
));
5236 debug_printf ("Proceeding, no step-over needed\n");
5238 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
5241 /* Stopped LWPs that the client wanted to be running, that don't have
5242 pending statuses, are set to run again, except for EXCEPT, if not
5243 NULL. This undoes a stop_all_lwps call. */
5246 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
5252 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5253 lwpid_of (get_lwp_thread (except
)));
5255 debug_printf ("unstopping all lwps\n");
5259 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
5261 find_inferior (&all_threads
, proceed_one_lwp
, except
);
5265 debug_printf ("unstop_all_lwps done\n");
5271 #ifdef HAVE_LINUX_REGSETS
5273 #define use_linux_regsets 1
5275 /* Returns true if REGSET has been disabled. */
5278 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
5280 return (info
->disabled_regsets
!= NULL
5281 && info
->disabled_regsets
[regset
- info
->regsets
]);
5284 /* Disable REGSET. */
5287 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
5291 dr_offset
= regset
- info
->regsets
;
5292 if (info
->disabled_regsets
== NULL
)
5293 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
5294 info
->disabled_regsets
[dr_offset
] = 1;
5298 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
5299 struct regcache
*regcache
)
5301 struct regset_info
*regset
;
5302 int saw_general_regs
= 0;
5306 pid
= lwpid_of (current_thread
);
5307 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5312 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
5315 buf
= xmalloc (regset
->size
);
5317 nt_type
= regset
->nt_type
;
5321 iov
.iov_len
= regset
->size
;
5322 data
= (void *) &iov
;
5328 res
= ptrace (regset
->get_request
, pid
,
5329 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5331 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5337 /* If we get EIO on a regset, do not try it again for
5338 this process mode. */
5339 disable_regset (regsets_info
, regset
);
5341 else if (errno
== ENODATA
)
5343 /* ENODATA may be returned if the regset is currently
5344 not "active". This can happen in normal operation,
5345 so suppress the warning in this case. */
5350 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5357 if (regset
->type
== GENERAL_REGS
)
5358 saw_general_regs
= 1;
5359 regset
->store_function (regcache
, buf
);
5363 if (saw_general_regs
)
5370 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5371 struct regcache
*regcache
)
5373 struct regset_info
*regset
;
5374 int saw_general_regs
= 0;
5378 pid
= lwpid_of (current_thread
);
5379 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5384 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5385 || regset
->fill_function
== NULL
)
5388 buf
= xmalloc (regset
->size
);
5390 /* First fill the buffer with the current register set contents,
5391 in case there are any items in the kernel's regset that are
5392 not in gdbserver's regcache. */
5394 nt_type
= regset
->nt_type
;
5398 iov
.iov_len
= regset
->size
;
5399 data
= (void *) &iov
;
5405 res
= ptrace (regset
->get_request
, pid
,
5406 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5408 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5413 /* Then overlay our cached registers on that. */
5414 regset
->fill_function (regcache
, buf
);
5416 /* Only now do we write the register set. */
5418 res
= ptrace (regset
->set_request
, pid
,
5419 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5421 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5429 /* If we get EIO on a regset, do not try it again for
5430 this process mode. */
5431 disable_regset (regsets_info
, regset
);
5433 else if (errno
== ESRCH
)
5435 /* At this point, ESRCH should mean the process is
5436 already gone, in which case we simply ignore attempts
5437 to change its registers. See also the related
5438 comment in linux_resume_one_lwp. */
5444 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5447 else if (regset
->type
== GENERAL_REGS
)
5448 saw_general_regs
= 1;
5451 if (saw_general_regs
)
5457 #else /* !HAVE_LINUX_REGSETS */
5459 #define use_linux_regsets 0
5460 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5461 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5465 /* Return 1 if register REGNO is supported by one of the regset ptrace
5466 calls or 0 if it has to be transferred individually. */
5469 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5471 unsigned char mask
= 1 << (regno
% 8);
5472 size_t index
= regno
/ 8;
5474 return (use_linux_regsets
5475 && (regs_info
->regset_bitmap
== NULL
5476 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5479 #ifdef HAVE_LINUX_USRREGS
5482 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5486 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5487 error ("Invalid register number %d.", regnum
);
5489 addr
= usrregs
->regmap
[regnum
];
5494 /* Fetch one register. */
5496 fetch_register (const struct usrregs_info
*usrregs
,
5497 struct regcache
*regcache
, int regno
)
5504 if (regno
>= usrregs
->num_regs
)
5506 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5509 regaddr
= register_addr (usrregs
, regno
);
5513 size
= ((register_size (regcache
->tdesc
, regno
)
5514 + sizeof (PTRACE_XFER_TYPE
) - 1)
5515 & -sizeof (PTRACE_XFER_TYPE
));
5516 buf
= (char *) alloca (size
);
5518 pid
= lwpid_of (current_thread
);
5519 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5522 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5523 ptrace (PTRACE_PEEKUSER
, pid
,
5524 /* Coerce to a uintptr_t first to avoid potential gcc warning
5525 of coercing an 8 byte integer to a 4 byte pointer. */
5526 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5527 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5529 error ("reading register %d: %s", regno
, strerror (errno
));
5532 if (the_low_target
.supply_ptrace_register
)
5533 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5535 supply_register (regcache
, regno
, buf
);
5538 /* Store one register. */
5540 store_register (const struct usrregs_info
*usrregs
,
5541 struct regcache
*regcache
, int regno
)
5548 if (regno
>= usrregs
->num_regs
)
5550 if ((*the_low_target
.cannot_store_register
) (regno
))
5553 regaddr
= register_addr (usrregs
, regno
);
5557 size
= ((register_size (regcache
->tdesc
, regno
)
5558 + sizeof (PTRACE_XFER_TYPE
) - 1)
5559 & -sizeof (PTRACE_XFER_TYPE
));
5560 buf
= (char *) alloca (size
);
5561 memset (buf
, 0, size
);
5563 if (the_low_target
.collect_ptrace_register
)
5564 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5566 collect_register (regcache
, regno
, buf
);
5568 pid
= lwpid_of (current_thread
);
5569 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5572 ptrace (PTRACE_POKEUSER
, pid
,
5573 /* Coerce to a uintptr_t first to avoid potential gcc warning
5574 about coercing an 8 byte integer to a 4 byte pointer. */
5575 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5576 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5579 /* At this point, ESRCH should mean the process is
5580 already gone, in which case we simply ignore attempts
5581 to change its registers. See also the related
5582 comment in linux_resume_one_lwp. */
5586 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5587 error ("writing register %d: %s", regno
, strerror (errno
));
5589 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5593 /* Fetch all registers, or just one, from the child process.
5594 If REGNO is -1, do this for all registers, skipping any that are
5595 assumed to have been retrieved by regsets_fetch_inferior_registers,
5596 unless ALL is non-zero.
5597 Otherwise, REGNO specifies which register (so we can save time). */
5599 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5600 struct regcache
*regcache
, int regno
, int all
)
5602 struct usrregs_info
*usr
= regs_info
->usrregs
;
5606 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5607 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5608 fetch_register (usr
, regcache
, regno
);
5611 fetch_register (usr
, regcache
, regno
);
5614 /* Store our register values back into the inferior.
5615 If REGNO is -1, do this for all registers, skipping any that are
5616 assumed to have been saved by regsets_store_inferior_registers,
5617 unless ALL is non-zero.
5618 Otherwise, REGNO specifies which register (so we can save time). */
5620 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5621 struct regcache
*regcache
, int regno
, int all
)
5623 struct usrregs_info
*usr
= regs_info
->usrregs
;
5627 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5628 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5629 store_register (usr
, regcache
, regno
);
5632 store_register (usr
, regcache
, regno
);
5635 #else /* !HAVE_LINUX_USRREGS */
5637 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5638 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5644 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5648 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5652 if (the_low_target
.fetch_register
!= NULL
5653 && regs_info
->usrregs
!= NULL
)
5654 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5655 (*the_low_target
.fetch_register
) (regcache
, regno
);
5657 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5658 if (regs_info
->usrregs
!= NULL
)
5659 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5663 if (the_low_target
.fetch_register
!= NULL
5664 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5667 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5669 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5671 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5672 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5677 linux_store_registers (struct regcache
*regcache
, int regno
)
5681 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5685 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5687 if (regs_info
->usrregs
!= NULL
)
5688 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5692 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5694 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5696 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5697 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5702 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5703 to debugger memory starting at MYADDR. */
5706 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5708 int pid
= lwpid_of (current_thread
);
5709 register PTRACE_XFER_TYPE
*buffer
;
5710 register CORE_ADDR addr
;
5717 /* Try using /proc. Don't bother for one word. */
5718 if (len
>= 3 * sizeof (long))
5722 /* We could keep this file open and cache it - possibly one per
5723 thread. That requires some juggling, but is even faster. */
5724 sprintf (filename
, "/proc/%d/mem", pid
);
5725 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5729 /* If pread64 is available, use it. It's faster if the kernel
5730 supports it (only one syscall), and it's 64-bit safe even on
5731 32-bit platforms (for instance, SPARC debugging a SPARC64
5734 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5737 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5738 bytes
= read (fd
, myaddr
, len
);
5745 /* Some data was read, we'll try to get the rest with ptrace. */
5755 /* Round starting address down to longword boundary. */
5756 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5757 /* Round ending address up; get number of longwords that makes. */
5758 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5759 / sizeof (PTRACE_XFER_TYPE
));
5760 /* Allocate buffer of that many longwords. */
5761 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5763 /* Read all the longwords */
5765 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5767 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5768 about coercing an 8 byte integer to a 4 byte pointer. */
5769 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5770 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5771 (PTRACE_TYPE_ARG4
) 0);
5777 /* Copy appropriate bytes out of the buffer. */
5780 i
*= sizeof (PTRACE_XFER_TYPE
);
5781 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5783 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5790 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5791 memory at MEMADDR. On failure (cannot write to the inferior)
5792 returns the value of errno. Always succeeds if LEN is zero. */
5795 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5798 /* Round starting address down to longword boundary. */
5799 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5800 /* Round ending address up; get number of longwords that makes. */
5802 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5803 / sizeof (PTRACE_XFER_TYPE
);
5805 /* Allocate buffer of that many longwords. */
5806 register PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5808 int pid
= lwpid_of (current_thread
);
5812 /* Zero length write always succeeds. */
5818 /* Dump up to four bytes. */
5819 char str
[4 * 2 + 1];
5821 int dump
= len
< 4 ? len
: 4;
5823 for (i
= 0; i
< dump
; i
++)
5825 sprintf (p
, "%02x", myaddr
[i
]);
5830 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5831 str
, (long) memaddr
, pid
);
5834 /* Fill start and end extra bytes of buffer with existing memory data. */
5837 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5838 about coercing an 8 byte integer to a 4 byte pointer. */
5839 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5840 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5841 (PTRACE_TYPE_ARG4
) 0);
5849 = ptrace (PTRACE_PEEKTEXT
, pid
,
5850 /* Coerce to a uintptr_t first to avoid potential gcc warning
5851 about coercing an 8 byte integer to a 4 byte pointer. */
5852 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5853 * sizeof (PTRACE_XFER_TYPE
)),
5854 (PTRACE_TYPE_ARG4
) 0);
5859 /* Copy data to be written over corresponding part of buffer. */
5861 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5864 /* Write the entire buffer. */
5866 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5869 ptrace (PTRACE_POKETEXT
, pid
,
5870 /* Coerce to a uintptr_t first to avoid potential gcc warning
5871 about coercing an 8 byte integer to a 4 byte pointer. */
5872 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5873 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5882 linux_look_up_symbols (void)
5884 #ifdef USE_THREAD_DB
5885 struct process_info
*proc
= current_process ();
5887 if (proc
->priv
->thread_db
!= NULL
)
5895 linux_request_interrupt (void)
5897 extern unsigned long signal_pid
;
5899 /* Send a SIGINT to the process group. This acts just like the user
5900 typed a ^C on the controlling terminal. */
5901 kill (-signal_pid
, SIGINT
);
5904 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5905 to debugger memory starting at MYADDR. */
5908 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5910 char filename
[PATH_MAX
];
5912 int pid
= lwpid_of (current_thread
);
5914 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5916 fd
= open (filename
, O_RDONLY
);
5920 if (offset
!= (CORE_ADDR
) 0
5921 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5924 n
= read (fd
, myaddr
, len
);
5931 /* These breakpoint and watchpoint related wrapper functions simply
5932 pass on the function call if the target has registered a
5933 corresponding function. */
5936 linux_supports_z_point_type (char z_type
)
5938 return (the_low_target
.supports_z_point_type
!= NULL
5939 && the_low_target
.supports_z_point_type (z_type
));
5943 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5944 int size
, struct raw_breakpoint
*bp
)
5946 if (type
== raw_bkpt_type_sw
)
5947 return insert_memory_breakpoint (bp
);
5948 else if (the_low_target
.insert_point
!= NULL
)
5949 return the_low_target
.insert_point (type
, addr
, size
, bp
);
5951 /* Unsupported (see target.h). */
5956 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5957 int size
, struct raw_breakpoint
*bp
)
5959 if (type
== raw_bkpt_type_sw
)
5960 return remove_memory_breakpoint (bp
);
5961 else if (the_low_target
.remove_point
!= NULL
)
5962 return the_low_target
.remove_point (type
, addr
, size
, bp
);
5964 /* Unsupported (see target.h). */
5968 /* Implement the to_stopped_by_sw_breakpoint target_ops
5972 linux_stopped_by_sw_breakpoint (void)
5974 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5976 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
5979 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
5983 linux_supports_stopped_by_sw_breakpoint (void)
5985 return USE_SIGTRAP_SIGINFO
;
5988 /* Implement the to_stopped_by_hw_breakpoint target_ops
5992 linux_stopped_by_hw_breakpoint (void)
5994 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5996 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
5999 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
6003 linux_supports_stopped_by_hw_breakpoint (void)
6005 return USE_SIGTRAP_SIGINFO
;
6008 /* Implement the supports_hardware_single_step target_ops method. */
6011 linux_supports_hardware_single_step (void)
6013 return can_hardware_single_step ();
6017 linux_supports_software_single_step (void)
6019 return can_software_single_step ();
6023 linux_stopped_by_watchpoint (void)
6025 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6027 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
6031 linux_stopped_data_address (void)
6033 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
6035 return lwp
->stopped_data_address
;
6038 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6039 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6040 && defined(PT_TEXT_END_ADDR)
6042 /* This is only used for targets that define PT_TEXT_ADDR,
6043 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
6044 the target has different ways of acquiring this information, like
6047 /* Under uClinux, programs are loaded at non-zero offsets, which we need
6048 to tell gdb about. */
6051 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
6053 unsigned long text
, text_end
, data
;
6054 int pid
= lwpid_of (current_thread
);
6058 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
6059 (PTRACE_TYPE_ARG4
) 0);
6060 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
6061 (PTRACE_TYPE_ARG4
) 0);
6062 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
6063 (PTRACE_TYPE_ARG4
) 0);
6067 /* Both text and data offsets produced at compile-time (and so
6068 used by gdb) are relative to the beginning of the program,
6069 with the data segment immediately following the text segment.
6070 However, the actual runtime layout in memory may put the data
6071 somewhere else, so when we send gdb a data base-address, we
6072 use the real data base address and subtract the compile-time
6073 data base-address from it (which is just the length of the
6074 text segment). BSS immediately follows data in both
6077 *data_p
= data
- (text_end
- text
);
6086 linux_qxfer_osdata (const char *annex
,
6087 unsigned char *readbuf
, unsigned const char *writebuf
,
6088 CORE_ADDR offset
, int len
)
6090 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
6093 /* Convert a native/host siginfo object, into/from the siginfo in the
6094 layout of the inferiors' architecture. */
6097 siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
6101 if (the_low_target
.siginfo_fixup
!= NULL
)
6102 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
6104 /* If there was no callback, or the callback didn't do anything,
6105 then just do a straight memcpy. */
6109 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
6111 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
6116 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
6117 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
6121 gdb_byte inf_siginfo
[sizeof (siginfo_t
)];
6123 if (current_thread
== NULL
)
6126 pid
= lwpid_of (current_thread
);
6129 debug_printf ("%s siginfo for lwp %d.\n",
6130 readbuf
!= NULL
? "Reading" : "Writing",
6133 if (offset
>= sizeof (siginfo
))
6136 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6139 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6140 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6141 inferior with a 64-bit GDBSERVER should look the same as debugging it
6142 with a 32-bit GDBSERVER, we need to convert it. */
6143 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
6145 if (offset
+ len
> sizeof (siginfo
))
6146 len
= sizeof (siginfo
) - offset
;
6148 if (readbuf
!= NULL
)
6149 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
6152 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
6154 /* Convert back to ptrace layout before flushing it out. */
6155 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
6157 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
6164 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6165 so we notice when children change state; as the handler for the
6166 sigsuspend in my_waitpid. */
6169 sigchld_handler (int signo
)
6171 int old_errno
= errno
;
6177 /* fprintf is not async-signal-safe, so call write
6179 if (write (2, "sigchld_handler\n",
6180 sizeof ("sigchld_handler\n") - 1) < 0)
6181 break; /* just ignore */
6185 if (target_is_async_p ())
6186 async_file_mark (); /* trigger a linux_wait */
6192 linux_supports_non_stop (void)
6198 linux_async (int enable
)
6200 int previous
= target_is_async_p ();
6203 debug_printf ("linux_async (%d), previous=%d\n",
6206 if (previous
!= enable
)
6209 sigemptyset (&mask
);
6210 sigaddset (&mask
, SIGCHLD
);
6212 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
6216 if (pipe (linux_event_pipe
) == -1)
6218 linux_event_pipe
[0] = -1;
6219 linux_event_pipe
[1] = -1;
6220 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6222 warning ("creating event pipe failed.");
6226 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
6227 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
6229 /* Register the event loop handler. */
6230 add_file_handler (linux_event_pipe
[0],
6231 handle_target_event
, NULL
);
6233 /* Always trigger a linux_wait. */
6238 delete_file_handler (linux_event_pipe
[0]);
6240 close (linux_event_pipe
[0]);
6241 close (linux_event_pipe
[1]);
6242 linux_event_pipe
[0] = -1;
6243 linux_event_pipe
[1] = -1;
6246 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
6253 linux_start_non_stop (int nonstop
)
6255 /* Register or unregister from event-loop accordingly. */
6256 linux_async (nonstop
);
6258 if (target_is_async_p () != (nonstop
!= 0))
6265 linux_supports_multi_process (void)
6270 /* Check if fork events are supported. */
6273 linux_supports_fork_events (void)
6275 return linux_supports_tracefork ();
6278 /* Check if vfork events are supported. */
6281 linux_supports_vfork_events (void)
6283 return linux_supports_tracefork ();
6286 /* Check if exec events are supported. */
6289 linux_supports_exec_events (void)
6291 return linux_supports_traceexec ();
6294 /* Callback for 'find_inferior'. Set the (possibly changed) ptrace
6295 options for the specified lwp. */
6298 reset_lwp_ptrace_options_callback (struct inferior_list_entry
*entry
,
6301 struct thread_info
*thread
= (struct thread_info
*) entry
;
6302 struct lwp_info
*lwp
= get_thread_lwp (thread
);
6306 /* Stop the lwp so we can modify its ptrace options. */
6307 lwp
->must_set_ptrace_flags
= 1;
6308 linux_stop_lwp (lwp
);
6312 /* Already stopped; go ahead and set the ptrace options. */
6313 struct process_info
*proc
= find_process_pid (pid_of (thread
));
6314 int options
= linux_low_ptrace_options (proc
->attached
);
6316 linux_enable_event_reporting (lwpid_of (thread
), options
);
6317 lwp
->must_set_ptrace_flags
= 0;
6323 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6324 ptrace flags for all inferiors. This is in case the new GDB connection
6325 doesn't support the same set of events that the previous one did. */
6328 linux_handle_new_gdb_connection (void)
6332 /* Request that all the lwps reset their ptrace options. */
6333 find_inferior (&all_threads
, reset_lwp_ptrace_options_callback
, &pid
);
6337 linux_supports_disable_randomization (void)
6339 #ifdef HAVE_PERSONALITY
6347 linux_supports_agent (void)
6353 linux_supports_range_stepping (void)
6355 if (*the_low_target
.supports_range_stepping
== NULL
)
6358 return (*the_low_target
.supports_range_stepping
) ();
6361 /* Enumerate spufs IDs for process PID. */
6363 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6369 struct dirent
*entry
;
6371 sprintf (path
, "/proc/%ld/fd", pid
);
6372 dir
= opendir (path
);
6377 while ((entry
= readdir (dir
)) != NULL
)
6383 fd
= atoi (entry
->d_name
);
6387 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6388 if (stat (path
, &st
) != 0)
6390 if (!S_ISDIR (st
.st_mode
))
6393 if (statfs (path
, &stfs
) != 0)
6395 if (stfs
.f_type
!= SPUFS_MAGIC
)
6398 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6400 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6410 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6411 object type, using the /proc file system. */
6413 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6414 unsigned const char *writebuf
,
6415 CORE_ADDR offset
, int len
)
6417 long pid
= lwpid_of (current_thread
);
6422 if (!writebuf
&& !readbuf
)
6430 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6433 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6434 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6439 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6446 ret
= write (fd
, writebuf
, (size_t) len
);
6448 ret
= read (fd
, readbuf
, (size_t) len
);
6454 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6455 struct target_loadseg
6457 /* Core address to which the segment is mapped. */
6459 /* VMA recorded in the program header. */
6461 /* Size of this segment in memory. */
6465 # if defined PT_GETDSBT
6466 struct target_loadmap
6468 /* Protocol version number, must be zero. */
6470 /* Pointer to the DSBT table, its size, and the DSBT index. */
6471 unsigned *dsbt_table
;
6472 unsigned dsbt_size
, dsbt_index
;
6473 /* Number of segments in this map. */
6475 /* The actual memory map. */
6476 struct target_loadseg segs
[/*nsegs*/];
6478 # define LINUX_LOADMAP PT_GETDSBT
6479 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6480 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6482 struct target_loadmap
6484 /* Protocol version number, must be zero. */
6486 /* Number of segments in this map. */
6488 /* The actual memory map. */
6489 struct target_loadseg segs
[/*nsegs*/];
6491 # define LINUX_LOADMAP PTRACE_GETFDPIC
6492 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6493 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6497 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6498 unsigned char *myaddr
, unsigned int len
)
6500 int pid
= lwpid_of (current_thread
);
6502 struct target_loadmap
*data
= NULL
;
6503 unsigned int actual_length
, copy_length
;
6505 if (strcmp (annex
, "exec") == 0)
6506 addr
= (int) LINUX_LOADMAP_EXEC
;
6507 else if (strcmp (annex
, "interp") == 0)
6508 addr
= (int) LINUX_LOADMAP_INTERP
;
6512 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6518 actual_length
= sizeof (struct target_loadmap
)
6519 + sizeof (struct target_loadseg
) * data
->nsegs
;
6521 if (offset
< 0 || offset
> actual_length
)
6524 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6525 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6529 # define linux_read_loadmap NULL
6530 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6533 linux_process_qsupported (char **features
, int count
)
6535 if (the_low_target
.process_qsupported
!= NULL
)
6536 the_low_target
.process_qsupported (features
, count
);
6540 linux_supports_catch_syscall (void)
6542 return (the_low_target
.get_syscall_trapinfo
!= NULL
6543 && linux_supports_tracesysgood ());
6547 linux_get_ipa_tdesc_idx (void)
6549 if (the_low_target
.get_ipa_tdesc_idx
== NULL
)
6552 return (*the_low_target
.get_ipa_tdesc_idx
) ();
6556 linux_supports_tracepoints (void)
6558 if (*the_low_target
.supports_tracepoints
== NULL
)
6561 return (*the_low_target
.supports_tracepoints
) ();
6565 linux_read_pc (struct regcache
*regcache
)
6567 if (the_low_target
.get_pc
== NULL
)
6570 return (*the_low_target
.get_pc
) (regcache
);
6574 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6576 gdb_assert (the_low_target
.set_pc
!= NULL
);
6578 (*the_low_target
.set_pc
) (regcache
, pc
);
6582 linux_thread_stopped (struct thread_info
*thread
)
6584 return get_thread_lwp (thread
)->stopped
;
6587 /* This exposes stop-all-threads functionality to other modules. */
6590 linux_pause_all (int freeze
)
6592 stop_all_lwps (freeze
, NULL
);
6595 /* This exposes unstop-all-threads functionality to other gdbserver
6599 linux_unpause_all (int unfreeze
)
6601 unstop_all_lwps (unfreeze
, NULL
);
6605 linux_prepare_to_access_memory (void)
6607 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6610 linux_pause_all (1);
6615 linux_done_accessing_memory (void)
6617 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6620 linux_unpause_all (1);
6624 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6625 CORE_ADDR collector
,
6628 CORE_ADDR
*jump_entry
,
6629 CORE_ADDR
*trampoline
,
6630 ULONGEST
*trampoline_size
,
6631 unsigned char *jjump_pad_insn
,
6632 ULONGEST
*jjump_pad_insn_size
,
6633 CORE_ADDR
*adjusted_insn_addr
,
6634 CORE_ADDR
*adjusted_insn_addr_end
,
6637 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6638 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6639 jump_entry
, trampoline
, trampoline_size
,
6640 jjump_pad_insn
, jjump_pad_insn_size
,
6641 adjusted_insn_addr
, adjusted_insn_addr_end
,
6645 static struct emit_ops
*
6646 linux_emit_ops (void)
6648 if (the_low_target
.emit_ops
!= NULL
)
6649 return (*the_low_target
.emit_ops
) ();
6655 linux_get_min_fast_tracepoint_insn_len (void)
6657 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6660 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6663 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6664 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6666 char filename
[PATH_MAX
];
6668 const int auxv_size
= is_elf64
6669 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6670 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6672 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6674 fd
= open (filename
, O_RDONLY
);
6680 while (read (fd
, buf
, auxv_size
) == auxv_size
6681 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6685 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6687 switch (aux
->a_type
)
6690 *phdr_memaddr
= aux
->a_un
.a_val
;
6693 *num_phdr
= aux
->a_un
.a_val
;
6699 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6701 switch (aux
->a_type
)
6704 *phdr_memaddr
= aux
->a_un
.a_val
;
6707 *num_phdr
= aux
->a_un
.a_val
;
6715 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6717 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6718 "phdr_memaddr = %ld, phdr_num = %d",
6719 (long) *phdr_memaddr
, *num_phdr
);
6726 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6729 get_dynamic (const int pid
, const int is_elf64
)
6731 CORE_ADDR phdr_memaddr
, relocation
;
6733 unsigned char *phdr_buf
;
6734 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6736 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6739 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6740 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6742 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6745 /* Compute relocation: it is expected to be 0 for "regular" executables,
6746 non-zero for PIE ones. */
6748 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6751 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6753 if (p
->p_type
== PT_PHDR
)
6754 relocation
= phdr_memaddr
- p
->p_vaddr
;
6758 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6760 if (p
->p_type
== PT_PHDR
)
6761 relocation
= phdr_memaddr
- p
->p_vaddr
;
6764 if (relocation
== -1)
6766 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6767 any real world executables, including PIE executables, have always
6768 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6769 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6770 or present DT_DEBUG anyway (fpc binaries are statically linked).
6772 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6774 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6779 for (i
= 0; i
< num_phdr
; i
++)
6783 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6785 if (p
->p_type
== PT_DYNAMIC
)
6786 return p
->p_vaddr
+ relocation
;
6790 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6792 if (p
->p_type
== PT_DYNAMIC
)
6793 return p
->p_vaddr
+ relocation
;
6800 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6801 can be 0 if the inferior does not yet have the library list initialized.
6802 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6803 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6806 get_r_debug (const int pid
, const int is_elf64
)
6808 CORE_ADDR dynamic_memaddr
;
6809 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6810 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6813 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6814 if (dynamic_memaddr
== 0)
6817 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6821 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6822 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6826 unsigned char buf
[sizeof (Elf64_Xword
)];
6830 #ifdef DT_MIPS_RLD_MAP
6831 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6833 if (linux_read_memory (dyn
->d_un
.d_val
,
6834 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6839 #endif /* DT_MIPS_RLD_MAP */
6840 #ifdef DT_MIPS_RLD_MAP_REL
6841 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6843 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6844 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6849 #endif /* DT_MIPS_RLD_MAP_REL */
6851 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6852 map
= dyn
->d_un
.d_val
;
6854 if (dyn
->d_tag
== DT_NULL
)
6859 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6860 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6864 unsigned char buf
[sizeof (Elf32_Word
)];
6868 #ifdef DT_MIPS_RLD_MAP
6869 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6871 if (linux_read_memory (dyn
->d_un
.d_val
,
6872 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6877 #endif /* DT_MIPS_RLD_MAP */
6878 #ifdef DT_MIPS_RLD_MAP_REL
6879 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6881 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6882 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6887 #endif /* DT_MIPS_RLD_MAP_REL */
6889 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6890 map
= dyn
->d_un
.d_val
;
6892 if (dyn
->d_tag
== DT_NULL
)
6896 dynamic_memaddr
+= dyn_size
;
6902 /* Read one pointer from MEMADDR in the inferior. */
6905 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6909 /* Go through a union so this works on either big or little endian
6910 hosts, when the inferior's pointer size is smaller than the size
6911 of CORE_ADDR. It is assumed the inferior's endianness is the
6912 same of the superior's. */
6915 CORE_ADDR core_addr
;
6920 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6923 if (ptr_size
== sizeof (CORE_ADDR
))
6924 *ptr
= addr
.core_addr
;
6925 else if (ptr_size
== sizeof (unsigned int))
6928 gdb_assert_not_reached ("unhandled pointer size");
6933 struct link_map_offsets
6935 /* Offset and size of r_debug.r_version. */
6936 int r_version_offset
;
6938 /* Offset and size of r_debug.r_map. */
6941 /* Offset to l_addr field in struct link_map. */
6944 /* Offset to l_name field in struct link_map. */
6947 /* Offset to l_ld field in struct link_map. */
6950 /* Offset to l_next field in struct link_map. */
6953 /* Offset to l_prev field in struct link_map. */
6957 /* Construct qXfer:libraries-svr4:read reply. */
6960 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
6961 unsigned const char *writebuf
,
6962 CORE_ADDR offset
, int len
)
6965 unsigned document_len
;
6966 struct process_info_private
*const priv
= current_process ()->priv
;
6967 char filename
[PATH_MAX
];
6970 static const struct link_map_offsets lmo_32bit_offsets
=
6972 0, /* r_version offset. */
6973 4, /* r_debug.r_map offset. */
6974 0, /* l_addr offset in link_map. */
6975 4, /* l_name offset in link_map. */
6976 8, /* l_ld offset in link_map. */
6977 12, /* l_next offset in link_map. */
6978 16 /* l_prev offset in link_map. */
6981 static const struct link_map_offsets lmo_64bit_offsets
=
6983 0, /* r_version offset. */
6984 8, /* r_debug.r_map offset. */
6985 0, /* l_addr offset in link_map. */
6986 8, /* l_name offset in link_map. */
6987 16, /* l_ld offset in link_map. */
6988 24, /* l_next offset in link_map. */
6989 32 /* l_prev offset in link_map. */
6991 const struct link_map_offsets
*lmo
;
6992 unsigned int machine
;
6994 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
6995 int allocated
= 1024;
6997 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
6998 int header_done
= 0;
7000 if (writebuf
!= NULL
)
7002 if (readbuf
== NULL
)
7005 pid
= lwpid_of (current_thread
);
7006 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
7007 is_elf64
= elf_64_file_p (filename
, &machine
);
7008 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
7009 ptr_size
= is_elf64
? 8 : 4;
7011 while (annex
[0] != '\0')
7017 sep
= strchr (annex
, '=');
7022 if (len
== 5 && startswith (annex
, "start"))
7024 else if (len
== 4 && startswith (annex
, "prev"))
7028 annex
= strchr (sep
, ';');
7035 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
7042 if (priv
->r_debug
== 0)
7043 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
7045 /* We failed to find DT_DEBUG. Such situation will not change
7046 for this inferior - do not retry it. Report it to GDB as
7047 E01, see for the reasons at the GDB solib-svr4.c side. */
7048 if (priv
->r_debug
== (CORE_ADDR
) -1)
7051 if (priv
->r_debug
!= 0)
7053 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
7054 (unsigned char *) &r_version
,
7055 sizeof (r_version
)) != 0
7058 warning ("unexpected r_debug version %d", r_version
);
7060 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
7061 &lm_addr
, ptr_size
) != 0)
7063 warning ("unable to read r_map from 0x%lx",
7064 (long) priv
->r_debug
+ lmo
->r_map_offset
);
7069 document
= (char *) xmalloc (allocated
);
7070 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
7071 p
= document
+ strlen (document
);
7074 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
7075 &l_name
, ptr_size
) == 0
7076 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
7077 &l_addr
, ptr_size
) == 0
7078 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
7079 &l_ld
, ptr_size
) == 0
7080 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
7081 &l_prev
, ptr_size
) == 0
7082 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
7083 &l_next
, ptr_size
) == 0)
7085 unsigned char libname
[PATH_MAX
];
7087 if (lm_prev
!= l_prev
)
7089 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
7090 (long) lm_prev
, (long) l_prev
);
7094 /* Ignore the first entry even if it has valid name as the first entry
7095 corresponds to the main executable. The first entry should not be
7096 skipped if the dynamic loader was loaded late by a static executable
7097 (see solib-svr4.c parameter ignore_first). But in such case the main
7098 executable does not have PT_DYNAMIC present and this function already
7099 exited above due to failed get_r_debug. */
7102 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
7107 /* Not checking for error because reading may stop before
7108 we've got PATH_MAX worth of characters. */
7110 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
7111 libname
[sizeof (libname
) - 1] = '\0';
7112 if (libname
[0] != '\0')
7114 /* 6x the size for xml_escape_text below. */
7115 size_t len
= 6 * strlen ((char *) libname
);
7120 /* Terminate `<library-list-svr4'. */
7125 while (allocated
< p
- document
+ len
+ 200)
7127 /* Expand to guarantee sufficient storage. */
7128 uintptr_t document_len
= p
- document
;
7130 document
= (char *) xrealloc (document
, 2 * allocated
);
7132 p
= document
+ document_len
;
7135 name
= xml_escape_text ((char *) libname
);
7136 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
7137 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7138 name
, (unsigned long) lm_addr
,
7139 (unsigned long) l_addr
, (unsigned long) l_ld
);
7150 /* Empty list; terminate `<library-list-svr4'. */
7154 strcpy (p
, "</library-list-svr4>");
7156 document_len
= strlen (document
);
7157 if (offset
< document_len
)
7158 document_len
-= offset
;
7161 if (len
> document_len
)
7164 memcpy (readbuf
, document
+ offset
, len
);
7170 #ifdef HAVE_LINUX_BTRACE
7172 /* See to_disable_btrace target method. */
7175 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
7177 enum btrace_error err
;
7179 err
= linux_disable_btrace (tinfo
);
7180 return (err
== BTRACE_ERR_NONE
? 0 : -1);
7183 /* Encode an Intel Processor Trace configuration. */
7186 linux_low_encode_pt_config (struct buffer
*buffer
,
7187 const struct btrace_data_pt_config
*config
)
7189 buffer_grow_str (buffer
, "<pt-config>\n");
7191 switch (config
->cpu
.vendor
)
7194 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7195 "model=\"%u\" stepping=\"%u\"/>\n",
7196 config
->cpu
.family
, config
->cpu
.model
,
7197 config
->cpu
.stepping
);
7204 buffer_grow_str (buffer
, "</pt-config>\n");
7207 /* Encode a raw buffer. */
7210 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
7216 /* We use hex encoding - see common/rsp-low.h. */
7217 buffer_grow_str (buffer
, "<raw>\n");
7223 elem
[0] = tohex ((*data
>> 4) & 0xf);
7224 elem
[1] = tohex (*data
++ & 0xf);
7226 buffer_grow (buffer
, elem
, 2);
7229 buffer_grow_str (buffer
, "</raw>\n");
7232 /* See to_read_btrace target method. */
7235 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
7236 enum btrace_read_type type
)
7238 struct btrace_data btrace
;
7239 struct btrace_block
*block
;
7240 enum btrace_error err
;
7243 btrace_data_init (&btrace
);
7245 err
= linux_read_btrace (&btrace
, tinfo
, type
);
7246 if (err
!= BTRACE_ERR_NONE
)
7248 if (err
== BTRACE_ERR_OVERFLOW
)
7249 buffer_grow_str0 (buffer
, "E.Overflow.");
7251 buffer_grow_str0 (buffer
, "E.Generic Error.");
7256 switch (btrace
.format
)
7258 case BTRACE_FORMAT_NONE
:
7259 buffer_grow_str0 (buffer
, "E.No Trace.");
7262 case BTRACE_FORMAT_BTS
:
7263 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7264 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7267 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
7269 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7270 paddress (block
->begin
), paddress (block
->end
));
7272 buffer_grow_str0 (buffer
, "</btrace>\n");
7275 case BTRACE_FORMAT_PT
:
7276 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7277 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
7278 buffer_grow_str (buffer
, "<pt>\n");
7280 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
7282 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
7283 btrace
.variant
.pt
.size
);
7285 buffer_grow_str (buffer
, "</pt>\n");
7286 buffer_grow_str0 (buffer
, "</btrace>\n");
7290 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
7294 btrace_data_fini (&btrace
);
7298 btrace_data_fini (&btrace
);
7302 /* See to_btrace_conf target method. */
7305 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
7306 struct buffer
*buffer
)
7308 const struct btrace_config
*conf
;
7310 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7311 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
7313 conf
= linux_btrace_conf (tinfo
);
7316 switch (conf
->format
)
7318 case BTRACE_FORMAT_NONE
:
7321 case BTRACE_FORMAT_BTS
:
7322 buffer_xml_printf (buffer
, "<bts");
7323 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
7324 buffer_xml_printf (buffer
, " />\n");
7327 case BTRACE_FORMAT_PT
:
7328 buffer_xml_printf (buffer
, "<pt");
7329 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
7330 buffer_xml_printf (buffer
, "/>\n");
7335 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
7338 #endif /* HAVE_LINUX_BTRACE */
7340 /* See nat/linux-nat.h. */
7343 current_lwp_ptid (void)
7345 return ptid_of (current_thread
);
7348 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7351 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
7353 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
7354 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
7356 return default_breakpoint_kind_from_pc (pcptr
);
7359 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7361 static const gdb_byte
*
7362 linux_sw_breakpoint_from_kind (int kind
, int *size
)
7364 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7366 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7369 /* Implementation of the target_ops method
7370 "breakpoint_kind_from_current_state". */
7373 linux_breakpoint_kind_from_current_state (CORE_ADDR
*pcptr
)
7375 if (the_low_target
.breakpoint_kind_from_current_state
!= NULL
)
7376 return (*the_low_target
.breakpoint_kind_from_current_state
) (pcptr
);
7378 return linux_breakpoint_kind_from_pc (pcptr
);
7381 /* Default implementation of linux_target_ops method "set_pc" for
7382 32-bit pc register which is literally named "pc". */
7385 linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
)
7387 uint32_t newpc
= pc
;
7389 supply_register_by_name (regcache
, "pc", &newpc
);
7392 /* Default implementation of linux_target_ops method "get_pc" for
7393 32-bit pc register which is literally named "pc". */
7396 linux_get_pc_32bit (struct regcache
*regcache
)
7400 collect_register_by_name (regcache
, "pc", &pc
);
7402 debug_printf ("stop pc is 0x%" PRIx32
"\n", pc
);
7406 /* Default implementation of linux_target_ops method "set_pc" for
7407 64-bit pc register which is literally named "pc". */
7410 linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
)
7412 uint64_t newpc
= pc
;
7414 supply_register_by_name (regcache
, "pc", &newpc
);
7417 /* Default implementation of linux_target_ops method "get_pc" for
7418 64-bit pc register which is literally named "pc". */
7421 linux_get_pc_64bit (struct regcache
*regcache
)
7425 collect_register_by_name (regcache
, "pc", &pc
);
7427 debug_printf ("stop pc is 0x%" PRIx64
"\n", pc
);
7432 static struct target_ops linux_target_ops
= {
7433 linux_create_inferior
,
7434 linux_post_create_inferior
,
7443 linux_fetch_registers
,
7444 linux_store_registers
,
7445 linux_prepare_to_access_memory
,
7446 linux_done_accessing_memory
,
7449 linux_look_up_symbols
,
7450 linux_request_interrupt
,
7452 linux_supports_z_point_type
,
7455 linux_stopped_by_sw_breakpoint
,
7456 linux_supports_stopped_by_sw_breakpoint
,
7457 linux_stopped_by_hw_breakpoint
,
7458 linux_supports_stopped_by_hw_breakpoint
,
7459 linux_supports_hardware_single_step
,
7460 linux_stopped_by_watchpoint
,
7461 linux_stopped_data_address
,
7462 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7463 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7464 && defined(PT_TEXT_END_ADDR)
7469 #ifdef USE_THREAD_DB
7470 thread_db_get_tls_address
,
7475 hostio_last_error_from_errno
,
7478 linux_supports_non_stop
,
7480 linux_start_non_stop
,
7481 linux_supports_multi_process
,
7482 linux_supports_fork_events
,
7483 linux_supports_vfork_events
,
7484 linux_supports_exec_events
,
7485 linux_handle_new_gdb_connection
,
7486 #ifdef USE_THREAD_DB
7487 thread_db_handle_monitor_command
,
7491 linux_common_core_of_thread
,
7493 linux_process_qsupported
,
7494 linux_supports_tracepoints
,
7497 linux_thread_stopped
,
7501 linux_stabilize_threads
,
7502 linux_install_fast_tracepoint_jump_pad
,
7504 linux_supports_disable_randomization
,
7505 linux_get_min_fast_tracepoint_insn_len
,
7506 linux_qxfer_libraries_svr4
,
7507 linux_supports_agent
,
7508 #ifdef HAVE_LINUX_BTRACE
7509 linux_supports_btrace
,
7510 linux_enable_btrace
,
7511 linux_low_disable_btrace
,
7512 linux_low_read_btrace
,
7513 linux_low_btrace_conf
,
7521 linux_supports_range_stepping
,
7522 linux_proc_pid_to_exec_file
,
7523 linux_mntns_open_cloexec
,
7525 linux_mntns_readlink
,
7526 linux_breakpoint_kind_from_pc
,
7527 linux_sw_breakpoint_from_kind
,
7528 linux_proc_tid_get_name
,
7529 linux_breakpoint_kind_from_current_state
,
7530 linux_supports_software_single_step
,
7531 linux_supports_catch_syscall
,
7532 linux_get_ipa_tdesc_idx
,
7535 #ifdef HAVE_LINUX_REGSETS
7537 initialize_regsets_info (struct regsets_info
*info
)
7539 for (info
->num_regsets
= 0;
7540 info
->regsets
[info
->num_regsets
].size
>= 0;
7541 info
->num_regsets
++)
7547 initialize_low (void)
7549 struct sigaction sigchld_action
;
7551 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7552 set_target_ops (&linux_target_ops
);
7554 linux_ptrace_init_warnings ();
7556 sigchld_action
.sa_handler
= sigchld_handler
;
7557 sigemptyset (&sigchld_action
.sa_mask
);
7558 sigchld_action
.sa_flags
= SA_RESTART
;
7559 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7561 initialize_low_arch ();
7563 linux_check_ptrace_features ();