1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2015 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"
50 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
51 then ELFMAG0 will have been defined. If it didn't get included by
52 gdb_proc_service.h then including it will likely introduce a duplicate
53 definition of elf_fpregset_t. */
56 #include "nat/linux-namespaces.h"
59 #define SPUFS_MAGIC 0x23c9b64e
62 #ifdef HAVE_PERSONALITY
63 # include <sys/personality.h>
64 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
65 # define ADDR_NO_RANDOMIZE 0x0040000
73 /* Some targets did not define these ptrace constants from the start,
74 so gdbserver defines them locally here. In the future, these may
75 be removed after they are added to asm/ptrace.h. */
76 #if !(defined(PT_TEXT_ADDR) \
77 || defined(PT_DATA_ADDR) \
78 || defined(PT_TEXT_END_ADDR))
79 #if defined(__mcoldfire__)
80 /* These are still undefined in 3.10 kernels. */
81 #define PT_TEXT_ADDR 49*4
82 #define PT_DATA_ADDR 50*4
83 #define PT_TEXT_END_ADDR 51*4
84 /* BFIN already defines these since at least 2.6.32 kernels. */
86 #define PT_TEXT_ADDR 220
87 #define PT_TEXT_END_ADDR 224
88 #define PT_DATA_ADDR 228
89 /* These are still undefined in 3.10 kernels. */
90 #elif defined(__TMS320C6X__)
91 #define PT_TEXT_ADDR (0x10000*4)
92 #define PT_DATA_ADDR (0x10004*4)
93 #define PT_TEXT_END_ADDR (0x10008*4)
97 #ifdef HAVE_LINUX_BTRACE
98 # include "nat/linux-btrace.h"
99 # include "btrace-common.h"
102 #ifndef HAVE_ELF32_AUXV_T
103 /* Copied from glibc's elf.h. */
106 uint32_t a_type
; /* Entry type */
109 uint32_t a_val
; /* Integer value */
110 /* We use to have pointer elements added here. We cannot do that,
111 though, since it does not work when using 32-bit definitions
112 on 64-bit platforms and vice versa. */
117 #ifndef HAVE_ELF64_AUXV_T
118 /* Copied from glibc's elf.h. */
121 uint64_t a_type
; /* Entry type */
124 uint64_t a_val
; /* Integer value */
125 /* We use to have pointer elements added here. We cannot do that,
126 though, since it does not work when using 32-bit definitions
127 on 64-bit platforms and vice versa. */
132 /* Does the current host support PTRACE_GETREGSET? */
133 int have_ptrace_getregset
= -1;
137 /* See nat/linux-nat.h. */
140 ptid_of_lwp (struct lwp_info
*lwp
)
142 return ptid_of (get_lwp_thread (lwp
));
145 /* See nat/linux-nat.h. */
148 lwp_set_arch_private_info (struct lwp_info
*lwp
,
149 struct arch_lwp_info
*info
)
151 lwp
->arch_private
= info
;
154 /* See nat/linux-nat.h. */
156 struct arch_lwp_info
*
157 lwp_arch_private_info (struct lwp_info
*lwp
)
159 return lwp
->arch_private
;
162 /* See nat/linux-nat.h. */
165 lwp_is_stopped (struct lwp_info
*lwp
)
170 /* See nat/linux-nat.h. */
172 enum target_stop_reason
173 lwp_stop_reason (struct lwp_info
*lwp
)
175 return lwp
->stop_reason
;
178 /* A list of all unknown processes which receive stop signals. Some
179 other process will presumably claim each of these as forked
180 children momentarily. */
182 struct simple_pid_list
184 /* The process ID. */
187 /* The status as reported by waitpid. */
191 struct simple_pid_list
*next
;
193 struct simple_pid_list
*stopped_pids
;
195 /* Trivial list manipulation functions to keep track of a list of new
196 stopped processes. */
199 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
201 struct simple_pid_list
*new_pid
= XNEW (struct simple_pid_list
);
204 new_pid
->status
= status
;
205 new_pid
->next
= *listp
;
210 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
212 struct simple_pid_list
**p
;
214 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
215 if ((*p
)->pid
== pid
)
217 struct simple_pid_list
*next
= (*p
)->next
;
219 *statusp
= (*p
)->status
;
227 enum stopping_threads_kind
229 /* Not stopping threads presently. */
230 NOT_STOPPING_THREADS
,
232 /* Stopping threads. */
235 /* Stopping and suspending threads. */
236 STOPPING_AND_SUSPENDING_THREADS
239 /* This is set while stop_all_lwps is in effect. */
240 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
242 /* FIXME make into a target method? */
243 int using_threads
= 1;
245 /* True if we're presently stabilizing threads (moving them out of
247 static int stabilizing_threads
;
249 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
250 int step
, int signal
, siginfo_t
*info
);
251 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
252 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
253 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
254 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
255 int *wstat
, int options
);
256 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
257 static struct lwp_info
*add_lwp (ptid_t ptid
);
258 static void linux_mourn (struct process_info
*process
);
259 static int linux_stopped_by_watchpoint (void);
260 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
261 static int lwp_is_marked_dead (struct lwp_info
*lwp
);
262 static void proceed_all_lwps (void);
263 static int finish_step_over (struct lwp_info
*lwp
);
264 static int kill_lwp (unsigned long lwpid
, int signo
);
265 static void enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
);
266 static void complete_ongoing_step_over (void);
268 /* When the event-loop is doing a step-over, this points at the thread
270 ptid_t step_over_bkpt
;
272 /* True if the low target can hardware single-step. Such targets
273 don't need a BREAKPOINT_REINSERT_ADDR callback. */
276 can_hardware_single_step (void)
278 return (the_low_target
.breakpoint_reinsert_addr
== NULL
);
281 /* True if the low target supports memory breakpoints. If so, we'll
282 have a GET_PC implementation. */
285 supports_breakpoints (void)
287 return (the_low_target
.get_pc
!= NULL
);
290 /* Returns true if this target can support fast tracepoints. This
291 does not mean that the in-process agent has been loaded in the
295 supports_fast_tracepoints (void)
297 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
300 /* True if LWP is stopped in its stepping range. */
303 lwp_in_step_range (struct lwp_info
*lwp
)
305 CORE_ADDR pc
= lwp
->stop_pc
;
307 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
310 struct pending_signals
314 struct pending_signals
*prev
;
317 /* The read/write ends of the pipe registered as waitable file in the
319 static int linux_event_pipe
[2] = { -1, -1 };
321 /* True if we're currently in async mode. */
322 #define target_is_async_p() (linux_event_pipe[0] != -1)
324 static void send_sigstop (struct lwp_info
*lwp
);
325 static void wait_for_sigstop (void);
327 /* Return non-zero if HEADER is a 64-bit ELF file. */
330 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
332 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
333 && header
->e_ident
[EI_MAG1
] == ELFMAG1
334 && header
->e_ident
[EI_MAG2
] == ELFMAG2
335 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
337 *machine
= header
->e_machine
;
338 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
345 /* Return non-zero if FILE is a 64-bit ELF file,
346 zero if the file is not a 64-bit ELF file,
347 and -1 if the file is not accessible or doesn't exist. */
350 elf_64_file_p (const char *file
, unsigned int *machine
)
355 fd
= open (file
, O_RDONLY
);
359 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
366 return elf_64_header_p (&header
, machine
);
369 /* Accepts an integer PID; Returns true if the executable PID is
370 running is a 64-bit ELF file.. */
373 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
377 sprintf (file
, "/proc/%d/exe", pid
);
378 return elf_64_file_p (file
, machine
);
382 delete_lwp (struct lwp_info
*lwp
)
384 struct thread_info
*thr
= get_lwp_thread (lwp
);
387 debug_printf ("deleting %ld\n", lwpid_of (thr
));
390 free (lwp
->arch_private
);
394 /* Add a process to the common process list, and set its private
397 static struct process_info
*
398 linux_add_process (int pid
, int attached
)
400 struct process_info
*proc
;
402 proc
= add_process (pid
, attached
);
403 proc
->priv
= XCNEW (struct process_info_private
);
405 if (the_low_target
.new_process
!= NULL
)
406 proc
->priv
->arch_private
= the_low_target
.new_process ();
411 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
413 /* Implement the arch_setup target_ops method. */
416 linux_arch_setup (void)
418 the_low_target
.arch_setup ();
421 /* Call the target arch_setup function on THREAD. */
424 linux_arch_setup_thread (struct thread_info
*thread
)
426 struct thread_info
*saved_thread
;
428 saved_thread
= current_thread
;
429 current_thread
= thread
;
433 current_thread
= saved_thread
;
436 /* Handle a GNU/Linux extended wait response. If we see a clone,
437 fork, or vfork event, we need to add the new LWP to our list
438 (and return 0 so as not to report the trap to higher layers).
439 If we see an exec event, we will modify ORIG_EVENT_LWP to point
440 to a new LWP representing the new program. */
443 handle_extended_wait (struct lwp_info
**orig_event_lwp
, int wstat
)
445 struct lwp_info
*event_lwp
= *orig_event_lwp
;
446 int event
= linux_ptrace_get_extended_event (wstat
);
447 struct thread_info
*event_thr
= get_lwp_thread (event_lwp
);
448 struct lwp_info
*new_lwp
;
450 gdb_assert (event_lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
452 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
453 || (event
== PTRACE_EVENT_CLONE
))
456 unsigned long new_pid
;
459 /* Get the pid of the new lwp. */
460 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
463 /* If we haven't already seen the new PID stop, wait for it now. */
464 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
466 /* The new child has a pending SIGSTOP. We can't affect it until it
467 hits the SIGSTOP, but we're already attached. */
469 ret
= my_waitpid (new_pid
, &status
, __WALL
);
472 perror_with_name ("waiting for new child");
473 else if (ret
!= new_pid
)
474 warning ("wait returned unexpected PID %d", ret
);
475 else if (!WIFSTOPPED (status
))
476 warning ("wait returned unexpected status 0x%x", status
);
479 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
481 struct process_info
*parent_proc
;
482 struct process_info
*child_proc
;
483 struct lwp_info
*child_lwp
;
484 struct thread_info
*child_thr
;
485 struct target_desc
*tdesc
;
487 ptid
= ptid_build (new_pid
, new_pid
, 0);
491 debug_printf ("HEW: Got fork event from LWP %ld, "
493 ptid_get_lwp (ptid_of (event_thr
)),
494 ptid_get_pid (ptid
));
497 /* Add the new process to the tables and clone the breakpoint
498 lists of the parent. We need to do this even if the new process
499 will be detached, since we will need the process object and the
500 breakpoints to remove any breakpoints from memory when we
501 detach, and the client side will access registers. */
502 child_proc
= linux_add_process (new_pid
, 0);
503 gdb_assert (child_proc
!= NULL
);
504 child_lwp
= add_lwp (ptid
);
505 gdb_assert (child_lwp
!= NULL
);
506 child_lwp
->stopped
= 1;
507 child_lwp
->must_set_ptrace_flags
= 1;
508 child_lwp
->status_pending_p
= 0;
509 child_thr
= get_lwp_thread (child_lwp
);
510 child_thr
->last_resume_kind
= resume_stop
;
511 child_thr
->last_status
.kind
= TARGET_WAITKIND_STOPPED
;
513 /* If we're suspending all threads, leave this one suspended
515 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
)
518 debug_printf ("HEW: leaving child suspended\n");
519 child_lwp
->suspended
= 1;
522 parent_proc
= get_thread_process (event_thr
);
523 child_proc
->attached
= parent_proc
->attached
;
524 clone_all_breakpoints (&child_proc
->breakpoints
,
525 &child_proc
->raw_breakpoints
,
526 parent_proc
->breakpoints
);
528 tdesc
= XNEW (struct target_desc
);
529 copy_target_description (tdesc
, parent_proc
->tdesc
);
530 child_proc
->tdesc
= tdesc
;
532 /* Clone arch-specific process data. */
533 if (the_low_target
.new_fork
!= NULL
)
534 the_low_target
.new_fork (parent_proc
, child_proc
);
536 /* Save fork info in the parent thread. */
537 if (event
== PTRACE_EVENT_FORK
)
538 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
539 else if (event
== PTRACE_EVENT_VFORK
)
540 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
542 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
544 /* The status_pending field contains bits denoting the
545 extended event, so when the pending event is handled,
546 the handler will look at lwp->waitstatus. */
547 event_lwp
->status_pending_p
= 1;
548 event_lwp
->status_pending
= wstat
;
550 /* Report the event. */
555 debug_printf ("HEW: Got clone event "
556 "from LWP %ld, new child is LWP %ld\n",
557 lwpid_of (event_thr
), new_pid
);
559 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
560 new_lwp
= add_lwp (ptid
);
562 /* Either we're going to immediately resume the new thread
563 or leave it stopped. linux_resume_one_lwp is a nop if it
564 thinks the thread is currently running, so set this first
565 before calling linux_resume_one_lwp. */
566 new_lwp
->stopped
= 1;
568 /* If we're suspending all threads, leave this one suspended
570 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
)
571 new_lwp
->suspended
= 1;
573 /* Normally we will get the pending SIGSTOP. But in some cases
574 we might get another signal delivered to the group first.
575 If we do get another signal, be sure not to lose it. */
576 if (WSTOPSIG (status
) != SIGSTOP
)
578 new_lwp
->stop_expected
= 1;
579 new_lwp
->status_pending_p
= 1;
580 new_lwp
->status_pending
= status
;
582 else if (report_thread_events
)
584 new_lwp
->waitstatus
.kind
= TARGET_WAITKIND_THREAD_CREATED
;
585 new_lwp
->status_pending_p
= 1;
586 new_lwp
->status_pending
= status
;
589 /* Don't report the event. */
592 else if (event
== PTRACE_EVENT_VFORK_DONE
)
594 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
596 /* Report the event. */
599 else if (event
== PTRACE_EVENT_EXEC
&& report_exec_events
)
601 struct process_info
*proc
;
607 debug_printf ("HEW: Got exec event from LWP %ld\n",
608 lwpid_of (event_thr
));
611 /* Get the event ptid. */
612 event_ptid
= ptid_of (event_thr
);
613 event_pid
= ptid_get_pid (event_ptid
);
615 /* Delete the execing process and all its threads. */
616 proc
= get_thread_process (event_thr
);
618 current_thread
= NULL
;
620 /* Create a new process/lwp/thread. */
621 proc
= linux_add_process (event_pid
, 0);
622 event_lwp
= add_lwp (event_ptid
);
623 event_thr
= get_lwp_thread (event_lwp
);
624 gdb_assert (current_thread
== event_thr
);
625 linux_arch_setup_thread (event_thr
);
627 /* Set the event status. */
628 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
629 event_lwp
->waitstatus
.value
.execd_pathname
630 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
632 /* Mark the exec status as pending. */
633 event_lwp
->stopped
= 1;
634 event_lwp
->status_pending_p
= 1;
635 event_lwp
->status_pending
= wstat
;
636 event_thr
->last_resume_kind
= resume_continue
;
637 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
639 /* Report the event. */
640 *orig_event_lwp
= event_lwp
;
644 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
647 /* Return the PC as read from the regcache of LWP, without any
651 get_pc (struct lwp_info
*lwp
)
653 struct thread_info
*saved_thread
;
654 struct regcache
*regcache
;
657 if (the_low_target
.get_pc
== NULL
)
660 saved_thread
= current_thread
;
661 current_thread
= get_lwp_thread (lwp
);
663 regcache
= get_thread_regcache (current_thread
, 1);
664 pc
= (*the_low_target
.get_pc
) (regcache
);
667 debug_printf ("pc is 0x%lx\n", (long) pc
);
669 current_thread
= saved_thread
;
673 /* This function should only be called if LWP got a SIGTRAP.
674 The SIGTRAP could mean several things.
676 On i386, where decr_pc_after_break is non-zero:
678 If we were single-stepping this process using PTRACE_SINGLESTEP, we
679 will get only the one SIGTRAP. The value of $eip will be the next
680 instruction. If the instruction we stepped over was a breakpoint,
681 we need to decrement the PC.
683 If we continue the process using PTRACE_CONT, we will get a
684 SIGTRAP when we hit a breakpoint. The value of $eip will be
685 the instruction after the breakpoint (i.e. needs to be
686 decremented). If we report the SIGTRAP to GDB, we must also
687 report the undecremented PC. If the breakpoint is removed, we
688 must resume at the decremented PC.
690 On a non-decr_pc_after_break machine with hardware or kernel
693 If we either single-step a breakpoint instruction, or continue and
694 hit a breakpoint instruction, our PC will point at the breakpoint
698 check_stopped_by_breakpoint (struct lwp_info
*lwp
)
701 CORE_ADDR sw_breakpoint_pc
;
702 struct thread_info
*saved_thread
;
703 #if USE_SIGTRAP_SIGINFO
707 if (the_low_target
.get_pc
== NULL
)
711 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
713 /* breakpoint_at reads from the current thread. */
714 saved_thread
= current_thread
;
715 current_thread
= get_lwp_thread (lwp
);
717 #if USE_SIGTRAP_SIGINFO
718 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
719 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
721 if (siginfo
.si_signo
== SIGTRAP
)
723 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
727 struct thread_info
*thr
= get_lwp_thread (lwp
);
729 debug_printf ("CSBB: %s stopped by software breakpoint\n",
730 target_pid_to_str (ptid_of (thr
)));
733 /* Back up the PC if necessary. */
734 if (pc
!= sw_breakpoint_pc
)
736 struct regcache
*regcache
737 = get_thread_regcache (current_thread
, 1);
738 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
741 lwp
->stop_pc
= sw_breakpoint_pc
;
742 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
743 current_thread
= saved_thread
;
746 else if (siginfo
.si_code
== TRAP_HWBKPT
)
750 struct thread_info
*thr
= get_lwp_thread (lwp
);
752 debug_printf ("CSBB: %s stopped by hardware "
753 "breakpoint/watchpoint\n",
754 target_pid_to_str (ptid_of (thr
)));
758 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
759 current_thread
= saved_thread
;
762 else if (siginfo
.si_code
== TRAP_TRACE
)
766 struct thread_info
*thr
= get_lwp_thread (lwp
);
768 debug_printf ("CSBB: %s stopped by trace\n",
769 target_pid_to_str (ptid_of (thr
)));
772 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
777 /* We may have just stepped a breakpoint instruction. E.g., in
778 non-stop mode, GDB first tells the thread A to step a range, and
779 then the user inserts a breakpoint inside the range. In that
780 case we need to report the breakpoint PC. */
781 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
782 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
786 struct thread_info
*thr
= get_lwp_thread (lwp
);
788 debug_printf ("CSBB: %s stopped by software breakpoint\n",
789 target_pid_to_str (ptid_of (thr
)));
792 /* Back up the PC if necessary. */
793 if (pc
!= sw_breakpoint_pc
)
795 struct regcache
*regcache
796 = get_thread_regcache (current_thread
, 1);
797 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
800 lwp
->stop_pc
= sw_breakpoint_pc
;
801 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
802 current_thread
= saved_thread
;
806 if (hardware_breakpoint_inserted_here (pc
))
810 struct thread_info
*thr
= get_lwp_thread (lwp
);
812 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
813 target_pid_to_str (ptid_of (thr
)));
817 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
818 current_thread
= saved_thread
;
823 current_thread
= saved_thread
;
827 static struct lwp_info
*
828 add_lwp (ptid_t ptid
)
830 struct lwp_info
*lwp
;
832 lwp
= XCNEW (struct lwp_info
);
834 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
836 if (the_low_target
.new_thread
!= NULL
)
837 the_low_target
.new_thread (lwp
);
839 lwp
->thread
= add_thread (ptid
, lwp
);
844 /* Start an inferior process and returns its pid.
845 ALLARGS is a vector of program-name and args. */
848 linux_create_inferior (char *program
, char **allargs
)
850 struct lwp_info
*new_lwp
;
853 struct cleanup
*restore_personality
854 = maybe_disable_address_space_randomization (disable_randomization
);
856 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
862 perror_with_name ("fork");
867 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
869 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
870 signal (__SIGRTMIN
+ 1, SIG_DFL
);
875 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
876 stdout to stderr so that inferior i/o doesn't corrupt the connection.
877 Also, redirect stdin to /dev/null. */
878 if (remote_connection_is_stdio ())
881 open ("/dev/null", O_RDONLY
);
883 if (write (2, "stdin/stdout redirected\n",
884 sizeof ("stdin/stdout redirected\n") - 1) < 0)
886 /* Errors ignored. */;
890 execv (program
, allargs
);
892 execvp (program
, allargs
);
894 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
900 do_cleanups (restore_personality
);
902 linux_add_process (pid
, 0);
904 ptid
= ptid_build (pid
, pid
, 0);
905 new_lwp
= add_lwp (ptid
);
906 new_lwp
->must_set_ptrace_flags
= 1;
911 /* Attach to an inferior process. Returns 0 on success, ERRNO on
915 linux_attach_lwp (ptid_t ptid
)
917 struct lwp_info
*new_lwp
;
918 int lwpid
= ptid_get_lwp (ptid
);
920 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
924 new_lwp
= add_lwp (ptid
);
926 /* We need to wait for SIGSTOP before being able to make the next
927 ptrace call on this LWP. */
928 new_lwp
->must_set_ptrace_flags
= 1;
930 if (linux_proc_pid_is_stopped (lwpid
))
933 debug_printf ("Attached to a stopped process\n");
935 /* The process is definitely stopped. It is in a job control
936 stop, unless the kernel predates the TASK_STOPPED /
937 TASK_TRACED distinction, in which case it might be in a
938 ptrace stop. Make sure it is in a ptrace stop; from there we
939 can kill it, signal it, et cetera.
941 First make sure there is a pending SIGSTOP. Since we are
942 already attached, the process can not transition from stopped
943 to running without a PTRACE_CONT; so we know this signal will
944 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
945 probably already in the queue (unless this kernel is old
946 enough to use TASK_STOPPED for ptrace stops); but since
947 SIGSTOP is not an RT signal, it can only be queued once. */
948 kill_lwp (lwpid
, SIGSTOP
);
950 /* Finally, resume the stopped process. This will deliver the
951 SIGSTOP (or a higher priority signal, just like normal
952 PTRACE_ATTACH), which we'll catch later on. */
953 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
956 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
959 There are several cases to consider here:
961 1) gdbserver has already attached to the process and is being notified
962 of a new thread that is being created.
963 In this case we should ignore that SIGSTOP and resume the
964 process. This is handled below by setting stop_expected = 1,
965 and the fact that add_thread sets last_resume_kind ==
968 2) This is the first thread (the process thread), and we're attaching
969 to it via attach_inferior.
970 In this case we want the process thread to stop.
971 This is handled by having linux_attach set last_resume_kind ==
972 resume_stop after we return.
974 If the pid we are attaching to is also the tgid, we attach to and
975 stop all the existing threads. Otherwise, we attach to pid and
976 ignore any other threads in the same group as this pid.
978 3) GDB is connecting to gdbserver and is requesting an enumeration of all
980 In this case we want the thread to stop.
981 FIXME: This case is currently not properly handled.
982 We should wait for the SIGSTOP but don't. Things work apparently
983 because enough time passes between when we ptrace (ATTACH) and when
984 gdb makes the next ptrace call on the thread.
986 On the other hand, if we are currently trying to stop all threads, we
987 should treat the new thread as if we had sent it a SIGSTOP. This works
988 because we are guaranteed that the add_lwp call above added us to the
989 end of the list, and so the new thread has not yet reached
990 wait_for_sigstop (but will). */
991 new_lwp
->stop_expected
= 1;
996 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
997 already attached. Returns true if a new LWP is found, false
1001 attach_proc_task_lwp_callback (ptid_t ptid
)
1003 /* Is this a new thread? */
1004 if (find_thread_ptid (ptid
) == NULL
)
1006 int lwpid
= ptid_get_lwp (ptid
);
1010 debug_printf ("Found new lwp %d\n", lwpid
);
1012 err
= linux_attach_lwp (ptid
);
1014 /* Be quiet if we simply raced with the thread exiting. EPERM
1015 is returned if the thread's task still exists, and is marked
1016 as exited or zombie, as well as other conditions, so in that
1017 case, confirm the status in /proc/PID/status. */
1019 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1023 debug_printf ("Cannot attach to lwp %d: "
1024 "thread is gone (%d: %s)\n",
1025 lwpid
, err
, strerror (err
));
1030 warning (_("Cannot attach to lwp %d: %s"),
1032 linux_ptrace_attach_fail_reason_string (ptid
, err
));
1040 static void async_file_mark (void);
1042 /* Attach to PID. If PID is the tgid, attach to it and all
1046 linux_attach (unsigned long pid
)
1048 struct process_info
*proc
;
1049 struct thread_info
*initial_thread
;
1050 ptid_t ptid
= ptid_build (pid
, pid
, 0);
1053 /* Attach to PID. We will check for other threads
1055 err
= linux_attach_lwp (ptid
);
1057 error ("Cannot attach to process %ld: %s",
1058 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
1060 proc
= linux_add_process (pid
, 1);
1062 /* Don't ignore the initial SIGSTOP if we just attached to this
1063 process. It will be collected by wait shortly. */
1064 initial_thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
1065 initial_thread
->last_resume_kind
= resume_stop
;
1067 /* We must attach to every LWP. If /proc is mounted, use that to
1068 find them now. On the one hand, the inferior may be using raw
1069 clone instead of using pthreads. On the other hand, even if it
1070 is using pthreads, GDB may not be connected yet (thread_db needs
1071 to do symbol lookups, through qSymbol). Also, thread_db walks
1072 structures in the inferior's address space to find the list of
1073 threads/LWPs, and those structures may well be corrupted. Note
1074 that once thread_db is loaded, we'll still use it to list threads
1075 and associate pthread info with each LWP. */
1076 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1078 /* GDB will shortly read the xml target description for this
1079 process, to figure out the process' architecture. But the target
1080 description is only filled in when the first process/thread in
1081 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1082 that now, otherwise, if GDB is fast enough, it could read the
1083 target description _before_ that initial stop. */
1086 struct lwp_info
*lwp
;
1088 ptid_t pid_ptid
= pid_to_ptid (pid
);
1090 lwpid
= linux_wait_for_event_filtered (pid_ptid
, pid_ptid
,
1092 gdb_assert (lwpid
> 0);
1094 lwp
= find_lwp_pid (pid_to_ptid (lwpid
));
1096 if (!WIFSTOPPED (wstat
) || WSTOPSIG (wstat
) != SIGSTOP
)
1098 lwp
->status_pending_p
= 1;
1099 lwp
->status_pending
= wstat
;
1102 initial_thread
->last_resume_kind
= resume_continue
;
1106 gdb_assert (proc
->tdesc
!= NULL
);
1119 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
1121 struct counter
*counter
= (struct counter
*) args
;
1123 if (ptid_get_pid (entry
->id
) == counter
->pid
)
1125 if (++counter
->count
> 1)
1133 last_thread_of_process_p (int pid
)
1135 struct counter counter
= { pid
, 0 };
1137 return (find_inferior (&all_threads
,
1138 second_thread_of_pid_p
, &counter
) == NULL
);
1144 linux_kill_one_lwp (struct lwp_info
*lwp
)
1146 struct thread_info
*thr
= get_lwp_thread (lwp
);
1147 int pid
= lwpid_of (thr
);
1149 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1150 there is no signal context, and ptrace(PTRACE_KILL) (or
1151 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1152 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1153 alternative is to kill with SIGKILL. We only need one SIGKILL
1154 per process, not one for each thread. But since we still support
1155 linuxthreads, and we also support debugging programs using raw
1156 clone without CLONE_THREAD, we send one for each thread. For
1157 years, we used PTRACE_KILL only, so we're being a bit paranoid
1158 about some old kernels where PTRACE_KILL might work better
1159 (dubious if there are any such, but that's why it's paranoia), so
1160 we try SIGKILL first, PTRACE_KILL second, and so we're fine
1164 kill_lwp (pid
, SIGKILL
);
1167 int save_errno
= errno
;
1169 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1170 target_pid_to_str (ptid_of (thr
)),
1171 save_errno
? strerror (save_errno
) : "OK");
1175 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1178 int save_errno
= errno
;
1180 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1181 target_pid_to_str (ptid_of (thr
)),
1182 save_errno
? strerror (save_errno
) : "OK");
1186 /* Kill LWP and wait for it to die. */
1189 kill_wait_lwp (struct lwp_info
*lwp
)
1191 struct thread_info
*thr
= get_lwp_thread (lwp
);
1192 int pid
= ptid_get_pid (ptid_of (thr
));
1193 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1198 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1202 linux_kill_one_lwp (lwp
);
1204 /* Make sure it died. Notes:
1206 - The loop is most likely unnecessary.
1208 - We don't use linux_wait_for_event as that could delete lwps
1209 while we're iterating over them. We're not interested in
1210 any pending status at this point, only in making sure all
1211 wait status on the kernel side are collected until the
1214 - We don't use __WALL here as the __WALL emulation relies on
1215 SIGCHLD, and killing a stopped process doesn't generate
1216 one, nor an exit status.
1218 res
= my_waitpid (lwpid
, &wstat
, 0);
1219 if (res
== -1 && errno
== ECHILD
)
1220 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1221 } while (res
> 0 && WIFSTOPPED (wstat
));
1223 /* Even if it was stopped, the child may have already disappeared.
1224 E.g., if it was killed by SIGKILL. */
1225 if (res
< 0 && errno
!= ECHILD
)
1226 perror_with_name ("kill_wait_lwp");
1229 /* Callback for `find_inferior'. Kills an lwp of a given process,
1230 except the leader. */
1233 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1235 struct thread_info
*thread
= (struct thread_info
*) entry
;
1236 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1237 int pid
= * (int *) args
;
1239 if (ptid_get_pid (entry
->id
) != pid
)
1242 /* We avoid killing the first thread here, because of a Linux kernel (at
1243 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1244 the children get a chance to be reaped, it will remain a zombie
1247 if (lwpid_of (thread
) == pid
)
1250 debug_printf ("lkop: is last of process %s\n",
1251 target_pid_to_str (entry
->id
));
1255 kill_wait_lwp (lwp
);
1260 linux_kill (int pid
)
1262 struct process_info
*process
;
1263 struct lwp_info
*lwp
;
1265 process
= find_process_pid (pid
);
1266 if (process
== NULL
)
1269 /* If we're killing a running inferior, make sure it is stopped
1270 first, as PTRACE_KILL will not work otherwise. */
1271 stop_all_lwps (0, NULL
);
1273 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1275 /* See the comment in linux_kill_one_lwp. We did not kill the first
1276 thread in the list, so do so now. */
1277 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1282 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1286 kill_wait_lwp (lwp
);
1288 the_target
->mourn (process
);
1290 /* Since we presently can only stop all lwps of all processes, we
1291 need to unstop lwps of other processes. */
1292 unstop_all_lwps (0, NULL
);
1296 /* Get pending signal of THREAD, for detaching purposes. This is the
1297 signal the thread last stopped for, which we need to deliver to the
1298 thread when detaching, otherwise, it'd be suppressed/lost. */
1301 get_detach_signal (struct thread_info
*thread
)
1303 enum gdb_signal signo
= GDB_SIGNAL_0
;
1305 struct lwp_info
*lp
= get_thread_lwp (thread
);
1307 if (lp
->status_pending_p
)
1308 status
= lp
->status_pending
;
1311 /* If the thread had been suspended by gdbserver, and it stopped
1312 cleanly, then it'll have stopped with SIGSTOP. But we don't
1313 want to deliver that SIGSTOP. */
1314 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1315 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1318 /* Otherwise, we may need to deliver the signal we
1320 status
= lp
->last_status
;
1323 if (!WIFSTOPPED (status
))
1326 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1327 target_pid_to_str (ptid_of (thread
)));
1331 /* Extended wait statuses aren't real SIGTRAPs. */
1332 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1335 debug_printf ("GPS: lwp %s had stopped with extended "
1336 "status: no pending signal\n",
1337 target_pid_to_str (ptid_of (thread
)));
1341 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1343 if (program_signals_p
&& !program_signals
[signo
])
1346 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1347 target_pid_to_str (ptid_of (thread
)),
1348 gdb_signal_to_string (signo
));
1351 else if (!program_signals_p
1352 /* If we have no way to know which signals GDB does not
1353 want to have passed to the program, assume
1354 SIGTRAP/SIGINT, which is GDB's default. */
1355 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1358 debug_printf ("GPS: lwp %s had signal %s, "
1359 "but we don't know if we should pass it. "
1360 "Default to not.\n",
1361 target_pid_to_str (ptid_of (thread
)),
1362 gdb_signal_to_string (signo
));
1368 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1369 target_pid_to_str (ptid_of (thread
)),
1370 gdb_signal_to_string (signo
));
1372 return WSTOPSIG (status
);
1377 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
1379 struct thread_info
*thread
= (struct thread_info
*) entry
;
1380 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1381 int pid
= * (int *) args
;
1384 if (ptid_get_pid (entry
->id
) != pid
)
1387 /* If there is a pending SIGSTOP, get rid of it. */
1388 if (lwp
->stop_expected
)
1391 debug_printf ("Sending SIGCONT to %s\n",
1392 target_pid_to_str (ptid_of (thread
)));
1394 kill_lwp (lwpid_of (thread
), SIGCONT
);
1395 lwp
->stop_expected
= 0;
1398 /* Flush any pending changes to the process's registers. */
1399 regcache_invalidate_thread (thread
);
1401 /* Pass on any pending signal for this thread. */
1402 sig
= get_detach_signal (thread
);
1404 /* Finally, let it resume. */
1405 if (the_low_target
.prepare_to_resume
!= NULL
)
1406 the_low_target
.prepare_to_resume (lwp
);
1407 if (ptrace (PTRACE_DETACH
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1408 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1409 error (_("Can't detach %s: %s"),
1410 target_pid_to_str (ptid_of (thread
)),
1418 linux_detach (int pid
)
1420 struct process_info
*process
;
1422 process
= find_process_pid (pid
);
1423 if (process
== NULL
)
1426 /* As there's a step over already in progress, let it finish first,
1427 otherwise nesting a stabilize_threads operation on top gets real
1429 complete_ongoing_step_over ();
1431 /* Stop all threads before detaching. First, ptrace requires that
1432 the thread is stopped to sucessfully detach. Second, thread_db
1433 may need to uninstall thread event breakpoints from memory, which
1434 only works with a stopped process anyway. */
1435 stop_all_lwps (0, NULL
);
1437 #ifdef USE_THREAD_DB
1438 thread_db_detach (process
);
1441 /* Stabilize threads (move out of jump pads). */
1442 stabilize_threads ();
1444 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
1446 the_target
->mourn (process
);
1448 /* Since we presently can only stop all lwps of all processes, we
1449 need to unstop lwps of other processes. */
1450 unstop_all_lwps (0, NULL
);
1454 /* Remove all LWPs that belong to process PROC from the lwp list. */
1457 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1459 struct thread_info
*thread
= (struct thread_info
*) entry
;
1460 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1461 struct process_info
*process
= (struct process_info
*) proc
;
1463 if (pid_of (thread
) == pid_of (process
))
1470 linux_mourn (struct process_info
*process
)
1472 struct process_info_private
*priv
;
1474 #ifdef USE_THREAD_DB
1475 thread_db_mourn (process
);
1478 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1480 /* Freeing all private data. */
1481 priv
= process
->priv
;
1482 free (priv
->arch_private
);
1484 process
->priv
= NULL
;
1486 remove_process (process
);
1490 linux_join (int pid
)
1495 ret
= my_waitpid (pid
, &status
, 0);
1496 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1498 } while (ret
!= -1 || errno
!= ECHILD
);
1501 /* Return nonzero if the given thread is still alive. */
1503 linux_thread_alive (ptid_t ptid
)
1505 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1507 /* We assume we always know if a thread exits. If a whole process
1508 exited but we still haven't been able to report it to GDB, we'll
1509 hold on to the last lwp of the dead process. */
1511 return !lwp_is_marked_dead (lwp
);
1516 /* Return 1 if this lwp still has an interesting status pending. If
1517 not (e.g., it had stopped for a breakpoint that is gone), return
1521 thread_still_has_status_pending_p (struct thread_info
*thread
)
1523 struct lwp_info
*lp
= get_thread_lwp (thread
);
1525 if (!lp
->status_pending_p
)
1528 /* If we got a `vCont;t', but we haven't reported a stop yet, do
1529 report any status pending the LWP may have. */
1530 if (thread
->last_resume_kind
== resume_stop
1531 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
1534 if (thread
->last_resume_kind
!= resume_stop
1535 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1536 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1538 struct thread_info
*saved_thread
;
1542 gdb_assert (lp
->last_status
!= 0);
1546 saved_thread
= current_thread
;
1547 current_thread
= thread
;
1549 if (pc
!= lp
->stop_pc
)
1552 debug_printf ("PC of %ld changed\n",
1557 #if !USE_SIGTRAP_SIGINFO
1558 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1559 && !(*the_low_target
.breakpoint_at
) (pc
))
1562 debug_printf ("previous SW breakpoint of %ld gone\n",
1566 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1567 && !hardware_breakpoint_inserted_here (pc
))
1570 debug_printf ("previous HW breakpoint of %ld gone\n",
1576 current_thread
= saved_thread
;
1581 debug_printf ("discarding pending breakpoint status\n");
1582 lp
->status_pending_p
= 0;
1590 /* Return 1 if this lwp has an interesting status pending. */
1592 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1594 struct thread_info
*thread
= (struct thread_info
*) entry
;
1595 struct lwp_info
*lp
= get_thread_lwp (thread
);
1596 ptid_t ptid
= * (ptid_t
*) arg
;
1598 /* Check if we're only interested in events from a specific process
1599 or a specific LWP. */
1600 if (!ptid_match (ptid_of (thread
), ptid
))
1603 if (lp
->status_pending_p
1604 && !thread_still_has_status_pending_p (thread
))
1606 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1610 return lp
->status_pending_p
;
1614 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1616 ptid_t ptid
= *(ptid_t
*) data
;
1619 if (ptid_get_lwp (ptid
) != 0)
1620 lwp
= ptid_get_lwp (ptid
);
1622 lwp
= ptid_get_pid (ptid
);
1624 if (ptid_get_lwp (entry
->id
) == lwp
)
1631 find_lwp_pid (ptid_t ptid
)
1633 struct inferior_list_entry
*thread
1634 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1639 return get_thread_lwp ((struct thread_info
*) thread
);
1642 /* Return the number of known LWPs in the tgid given by PID. */
1647 struct inferior_list_entry
*inf
, *tmp
;
1650 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1652 if (ptid_get_pid (inf
->id
) == pid
)
1659 /* The arguments passed to iterate_over_lwps. */
1661 struct iterate_over_lwps_args
1663 /* The FILTER argument passed to iterate_over_lwps. */
1666 /* The CALLBACK argument passed to iterate_over_lwps. */
1667 iterate_over_lwps_ftype
*callback
;
1669 /* The DATA argument passed to iterate_over_lwps. */
1673 /* Callback for find_inferior used by iterate_over_lwps to filter
1674 calls to the callback supplied to that function. Returning a
1675 nonzero value causes find_inferiors to stop iterating and return
1676 the current inferior_list_entry. Returning zero indicates that
1677 find_inferiors should continue iterating. */
1680 iterate_over_lwps_filter (struct inferior_list_entry
*entry
, void *args_p
)
1682 struct iterate_over_lwps_args
*args
1683 = (struct iterate_over_lwps_args
*) args_p
;
1685 if (ptid_match (entry
->id
, args
->filter
))
1687 struct thread_info
*thr
= (struct thread_info
*) entry
;
1688 struct lwp_info
*lwp
= get_thread_lwp (thr
);
1690 return (*args
->callback
) (lwp
, args
->data
);
1696 /* See nat/linux-nat.h. */
1699 iterate_over_lwps (ptid_t filter
,
1700 iterate_over_lwps_ftype callback
,
1703 struct iterate_over_lwps_args args
= {filter
, callback
, data
};
1704 struct inferior_list_entry
*entry
;
1706 entry
= find_inferior (&all_threads
, iterate_over_lwps_filter
, &args
);
1710 return get_thread_lwp ((struct thread_info
*) entry
);
1713 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1714 their exits until all other threads in the group have exited. */
1717 check_zombie_leaders (void)
1719 struct process_info
*proc
, *tmp
;
1721 ALL_PROCESSES (proc
, tmp
)
1723 pid_t leader_pid
= pid_of (proc
);
1724 struct lwp_info
*leader_lp
;
1726 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1729 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1730 "num_lwps=%d, zombie=%d\n",
1731 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1732 linux_proc_pid_is_zombie (leader_pid
));
1734 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1735 /* Check if there are other threads in the group, as we may
1736 have raced with the inferior simply exiting. */
1737 && !last_thread_of_process_p (leader_pid
)
1738 && linux_proc_pid_is_zombie (leader_pid
))
1740 /* A leader zombie can mean one of two things:
1742 - It exited, and there's an exit status pending
1743 available, or only the leader exited (not the whole
1744 program). In the latter case, we can't waitpid the
1745 leader's exit status until all other threads are gone.
1747 - There are 3 or more threads in the group, and a thread
1748 other than the leader exec'd. On an exec, the Linux
1749 kernel destroys all other threads (except the execing
1750 one) in the thread group, and resets the execing thread's
1751 tid to the tgid. No exit notification is sent for the
1752 execing thread -- from the ptracer's perspective, it
1753 appears as though the execing thread just vanishes.
1754 Until we reap all other threads except the leader and the
1755 execing thread, the leader will be zombie, and the
1756 execing thread will be in `D (disc sleep)'. As soon as
1757 all other threads are reaped, the execing thread changes
1758 it's tid to the tgid, and the previous (zombie) leader
1759 vanishes, giving place to the "new" leader. We could try
1760 distinguishing the exit and exec cases, by waiting once
1761 more, and seeing if something comes out, but it doesn't
1762 sound useful. The previous leader _does_ go away, and
1763 we'll re-add the new one once we see the exec event
1764 (which is just the same as what would happen if the
1765 previous leader did exit voluntarily before some other
1770 "CZL: Thread group leader %d zombie "
1771 "(it exited, or another thread execd).\n",
1774 delete_lwp (leader_lp
);
1779 /* Callback for `find_inferior'. Returns the first LWP that is not
1780 stopped. ARG is a PTID filter. */
1783 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
1785 struct thread_info
*thr
= (struct thread_info
*) entry
;
1786 struct lwp_info
*lwp
;
1787 ptid_t filter
= *(ptid_t
*) arg
;
1789 if (!ptid_match (ptid_of (thr
), filter
))
1792 lwp
= get_thread_lwp (thr
);
1799 /* Increment LWP's suspend count. */
1802 lwp_suspended_inc (struct lwp_info
*lwp
)
1806 if (debug_threads
&& lwp
->suspended
> 4)
1808 struct thread_info
*thread
= get_lwp_thread (lwp
);
1810 debug_printf ("LWP %ld has a suspiciously high suspend count,"
1811 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
1815 /* Decrement LWP's suspend count. */
1818 lwp_suspended_decr (struct lwp_info
*lwp
)
1822 if (lwp
->suspended
< 0)
1824 struct thread_info
*thread
= get_lwp_thread (lwp
);
1826 internal_error (__FILE__
, __LINE__
,
1827 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
1832 /* This function should only be called if the LWP got a SIGTRAP.
1834 Handle any tracepoint steps or hits. Return true if a tracepoint
1835 event was handled, 0 otherwise. */
1838 handle_tracepoints (struct lwp_info
*lwp
)
1840 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1841 int tpoint_related_event
= 0;
1843 gdb_assert (lwp
->suspended
== 0);
1845 /* If this tracepoint hit causes a tracing stop, we'll immediately
1846 uninsert tracepoints. To do this, we temporarily pause all
1847 threads, unpatch away, and then unpause threads. We need to make
1848 sure the unpausing doesn't resume LWP too. */
1849 lwp_suspended_inc (lwp
);
1851 /* And we need to be sure that any all-threads-stopping doesn't try
1852 to move threads out of the jump pads, as it could deadlock the
1853 inferior (LWP could be in the jump pad, maybe even holding the
1856 /* Do any necessary step collect actions. */
1857 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1859 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1861 /* See if we just hit a tracepoint and do its main collect
1863 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1865 lwp_suspended_decr (lwp
);
1867 gdb_assert (lwp
->suspended
== 0);
1868 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
1870 if (tpoint_related_event
)
1873 debug_printf ("got a tracepoint event\n");
1880 /* Convenience wrapper. Returns true if LWP is presently collecting a
1884 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
1885 struct fast_tpoint_collect_status
*status
)
1887 CORE_ADDR thread_area
;
1888 struct thread_info
*thread
= get_lwp_thread (lwp
);
1890 if (the_low_target
.get_thread_area
== NULL
)
1893 /* Get the thread area address. This is used to recognize which
1894 thread is which when tracing with the in-process agent library.
1895 We don't read anything from the address, and treat it as opaque;
1896 it's the address itself that we assume is unique per-thread. */
1897 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
1900 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1903 /* The reason we resume in the caller, is because we want to be able
1904 to pass lwp->status_pending as WSTAT, and we need to clear
1905 status_pending_p before resuming, otherwise, linux_resume_one_lwp
1906 refuses to resume. */
1909 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
1911 struct thread_info
*saved_thread
;
1913 saved_thread
= current_thread
;
1914 current_thread
= get_lwp_thread (lwp
);
1917 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
1918 && supports_fast_tracepoints ()
1919 && agent_loaded_p ())
1921 struct fast_tpoint_collect_status status
;
1925 debug_printf ("Checking whether LWP %ld needs to move out of the "
1927 lwpid_of (current_thread
));
1929 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
1932 || (WSTOPSIG (*wstat
) != SIGILL
1933 && WSTOPSIG (*wstat
) != SIGFPE
1934 && WSTOPSIG (*wstat
) != SIGSEGV
1935 && WSTOPSIG (*wstat
) != SIGBUS
))
1937 lwp
->collecting_fast_tracepoint
= r
;
1941 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
1943 /* Haven't executed the original instruction yet.
1944 Set breakpoint there, and wait till it's hit,
1945 then single-step until exiting the jump pad. */
1946 lwp
->exit_jump_pad_bkpt
1947 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
1951 debug_printf ("Checking whether LWP %ld needs to move out of "
1952 "the jump pad...it does\n",
1953 lwpid_of (current_thread
));
1954 current_thread
= saved_thread
;
1961 /* If we get a synchronous signal while collecting, *and*
1962 while executing the (relocated) original instruction,
1963 reset the PC to point at the tpoint address, before
1964 reporting to GDB. Otherwise, it's an IPA lib bug: just
1965 report the signal to GDB, and pray for the best. */
1967 lwp
->collecting_fast_tracepoint
= 0;
1970 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
1971 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
1974 struct regcache
*regcache
;
1976 /* The si_addr on a few signals references the address
1977 of the faulting instruction. Adjust that as
1979 if ((WSTOPSIG (*wstat
) == SIGILL
1980 || WSTOPSIG (*wstat
) == SIGFPE
1981 || WSTOPSIG (*wstat
) == SIGBUS
1982 || WSTOPSIG (*wstat
) == SIGSEGV
)
1983 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
1984 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
1985 /* Final check just to make sure we don't clobber
1986 the siginfo of non-kernel-sent signals. */
1987 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
1989 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
1990 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
1991 (PTRACE_TYPE_ARG3
) 0, &info
);
1994 regcache
= get_thread_regcache (current_thread
, 1);
1995 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
1996 lwp
->stop_pc
= status
.tpoint_addr
;
1998 /* Cancel any fast tracepoint lock this thread was
2000 force_unlock_trace_buffer ();
2003 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
2006 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2007 "stopping all threads momentarily.\n");
2009 stop_all_lwps (1, lwp
);
2011 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
2012 lwp
->exit_jump_pad_bkpt
= NULL
;
2014 unstop_all_lwps (1, lwp
);
2016 gdb_assert (lwp
->suspended
>= 0);
2022 debug_printf ("Checking whether LWP %ld needs to move out of the "
2024 lwpid_of (current_thread
));
2026 current_thread
= saved_thread
;
2030 /* Enqueue one signal in the "signals to report later when out of the
2034 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2036 struct pending_signals
*p_sig
;
2037 struct thread_info
*thread
= get_lwp_thread (lwp
);
2040 debug_printf ("Deferring signal %d for LWP %ld.\n",
2041 WSTOPSIG (*wstat
), lwpid_of (thread
));
2045 struct pending_signals
*sig
;
2047 for (sig
= lwp
->pending_signals_to_report
;
2050 debug_printf (" Already queued %d\n",
2053 debug_printf (" (no more currently queued signals)\n");
2056 /* Don't enqueue non-RT signals if they are already in the deferred
2057 queue. (SIGSTOP being the easiest signal to see ending up here
2059 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2061 struct pending_signals
*sig
;
2063 for (sig
= lwp
->pending_signals_to_report
;
2067 if (sig
->signal
== WSTOPSIG (*wstat
))
2070 debug_printf ("Not requeuing already queued non-RT signal %d"
2079 p_sig
= XCNEW (struct pending_signals
);
2080 p_sig
->prev
= lwp
->pending_signals_to_report
;
2081 p_sig
->signal
= WSTOPSIG (*wstat
);
2083 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2086 lwp
->pending_signals_to_report
= p_sig
;
2089 /* Dequeue one signal from the "signals to report later when out of
2090 the jump pad" list. */
2093 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2095 struct thread_info
*thread
= get_lwp_thread (lwp
);
2097 if (lwp
->pending_signals_to_report
!= NULL
)
2099 struct pending_signals
**p_sig
;
2101 p_sig
= &lwp
->pending_signals_to_report
;
2102 while ((*p_sig
)->prev
!= NULL
)
2103 p_sig
= &(*p_sig
)->prev
;
2105 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2106 if ((*p_sig
)->info
.si_signo
!= 0)
2107 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2113 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2114 WSTOPSIG (*wstat
), lwpid_of (thread
));
2118 struct pending_signals
*sig
;
2120 for (sig
= lwp
->pending_signals_to_report
;
2123 debug_printf (" Still queued %d\n",
2126 debug_printf (" (no more queued signals)\n");
2135 /* Fetch the possibly triggered data watchpoint info and store it in
2138 On some archs, like x86, that use debug registers to set
2139 watchpoints, it's possible that the way to know which watched
2140 address trapped, is to check the register that is used to select
2141 which address to watch. Problem is, between setting the watchpoint
2142 and reading back which data address trapped, the user may change
2143 the set of watchpoints, and, as a consequence, GDB changes the
2144 debug registers in the inferior. To avoid reading back a stale
2145 stopped-data-address when that happens, we cache in LP the fact
2146 that a watchpoint trapped, and the corresponding data address, as
2147 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2148 registers meanwhile, we have the cached data we can rely on. */
2151 check_stopped_by_watchpoint (struct lwp_info
*child
)
2153 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2155 struct thread_info
*saved_thread
;
2157 saved_thread
= current_thread
;
2158 current_thread
= get_lwp_thread (child
);
2160 if (the_low_target
.stopped_by_watchpoint ())
2162 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2164 if (the_low_target
.stopped_data_address
!= NULL
)
2165 child
->stopped_data_address
2166 = the_low_target
.stopped_data_address ();
2168 child
->stopped_data_address
= 0;
2171 current_thread
= saved_thread
;
2174 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2177 /* Return the ptrace options that we want to try to enable. */
2180 linux_low_ptrace_options (int attached
)
2185 options
|= PTRACE_O_EXITKILL
;
2187 if (report_fork_events
)
2188 options
|= PTRACE_O_TRACEFORK
;
2190 if (report_vfork_events
)
2191 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2193 if (report_exec_events
)
2194 options
|= PTRACE_O_TRACEEXEC
;
2199 /* Do low-level handling of the event, and check if we should go on
2200 and pass it to caller code. Return the affected lwp if we are, or
2203 static struct lwp_info
*
2204 linux_low_filter_event (int lwpid
, int wstat
)
2206 struct lwp_info
*child
;
2207 struct thread_info
*thread
;
2208 int have_stop_pc
= 0;
2210 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2212 /* Check for stop events reported by a process we didn't already
2213 know about - anything not already in our LWP list.
2215 If we're expecting to receive stopped processes after
2216 fork, vfork, and clone events, then we'll just add the
2217 new one to our list and go back to waiting for the event
2218 to be reported - the stopped process might be returned
2219 from waitpid before or after the event is.
2221 But note the case of a non-leader thread exec'ing after the
2222 leader having exited, and gone from our lists (because
2223 check_zombie_leaders deleted it). The non-leader thread
2224 changes its tid to the tgid. */
2226 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2227 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2231 /* A multi-thread exec after we had seen the leader exiting. */
2234 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2235 "after exec.\n", lwpid
);
2238 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2239 child
= add_lwp (child_ptid
);
2241 current_thread
= child
->thread
;
2244 /* If we didn't find a process, one of two things presumably happened:
2245 - A process we started and then detached from has exited. Ignore it.
2246 - A process we are controlling has forked and the new child's stop
2247 was reported to us by the kernel. Save its PID. */
2248 if (child
== NULL
&& WIFSTOPPED (wstat
))
2250 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2253 else if (child
== NULL
)
2256 thread
= get_lwp_thread (child
);
2260 child
->last_status
= wstat
;
2262 /* Check if the thread has exited. */
2263 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2266 debug_printf ("LLFE: %d exited.\n", lwpid
);
2267 /* If there is at least one more LWP, then the exit signal was
2268 not the end of the debugged application and should be
2269 ignored, unless GDB wants to hear about thread exits. */
2270 if (report_thread_events
2271 || last_thread_of_process_p (pid_of (thread
)))
2273 /* Since events are serialized to GDB core, and we can't
2274 report this one right now. Leave the status pending for
2275 the next time we're able to report it. */
2276 mark_lwp_dead (child
, wstat
);
2286 gdb_assert (WIFSTOPPED (wstat
));
2288 if (WIFSTOPPED (wstat
))
2290 struct process_info
*proc
;
2292 /* Architecture-specific setup after inferior is running. */
2293 proc
= find_process_pid (pid_of (thread
));
2294 if (proc
->tdesc
== NULL
)
2298 /* This needs to happen after we have attached to the
2299 inferior and it is stopped for the first time, but
2300 before we access any inferior registers. */
2301 linux_arch_setup_thread (thread
);
2305 /* The process is started, but GDBserver will do
2306 architecture-specific setup after the program stops at
2307 the first instruction. */
2308 child
->status_pending_p
= 1;
2309 child
->status_pending
= wstat
;
2315 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2317 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2318 int options
= linux_low_ptrace_options (proc
->attached
);
2320 linux_enable_event_reporting (lwpid
, options
);
2321 child
->must_set_ptrace_flags
= 0;
2324 /* Be careful to not overwrite stop_pc until
2325 check_stopped_by_breakpoint is called. */
2326 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2327 && linux_is_extended_waitstatus (wstat
))
2329 child
->stop_pc
= get_pc (child
);
2330 if (handle_extended_wait (&child
, wstat
))
2332 /* The event has been handled, so just return without
2338 /* Check first whether this was a SW/HW breakpoint before checking
2339 watchpoints, because at least s390 can't tell the data address of
2340 hardware watchpoint hits, and returns stopped-by-watchpoint as
2341 long as there's a watchpoint set. */
2342 if (WIFSTOPPED (wstat
) && linux_wstatus_maybe_breakpoint (wstat
))
2344 if (check_stopped_by_breakpoint (child
))
2348 /* Note that TRAP_HWBKPT can indicate either a hardware breakpoint
2349 or hardware watchpoint. Check which is which if we got
2350 TARGET_STOPPED_BY_HW_BREAKPOINT. Likewise, we may have single
2351 stepped an instruction that triggered a watchpoint. In that
2352 case, on some architectures (such as x86), instead of
2353 TRAP_HWBKPT, si_code indicates TRAP_TRACE, and we need to check
2354 the debug registers separately. */
2355 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2356 && child
->stop_reason
!= TARGET_STOPPED_BY_SW_BREAKPOINT
)
2357 check_stopped_by_watchpoint (child
);
2360 child
->stop_pc
= get_pc (child
);
2362 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2363 && child
->stop_expected
)
2366 debug_printf ("Expected stop.\n");
2367 child
->stop_expected
= 0;
2369 if (thread
->last_resume_kind
== resume_stop
)
2371 /* We want to report the stop to the core. Treat the
2372 SIGSTOP as a normal event. */
2374 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2375 target_pid_to_str (ptid_of (thread
)));
2377 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2379 /* Stopping threads. We don't want this SIGSTOP to end up
2382 debug_printf ("LLW: SIGSTOP caught for %s "
2383 "while stopping threads.\n",
2384 target_pid_to_str (ptid_of (thread
)));
2389 /* This is a delayed SIGSTOP. Filter out the event. */
2391 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2392 child
->stepping
? "step" : "continue",
2393 target_pid_to_str (ptid_of (thread
)));
2395 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2400 child
->status_pending_p
= 1;
2401 child
->status_pending
= wstat
;
2405 /* Resume LWPs that are currently stopped without any pending status
2406 to report, but are resumed from the core's perspective. */
2409 resume_stopped_resumed_lwps (struct inferior_list_entry
*entry
)
2411 struct thread_info
*thread
= (struct thread_info
*) entry
;
2412 struct lwp_info
*lp
= get_thread_lwp (thread
);
2416 && !lp
->status_pending_p
2417 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2419 int step
= thread
->last_resume_kind
== resume_step
;
2422 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2423 target_pid_to_str (ptid_of (thread
)),
2424 paddress (lp
->stop_pc
),
2427 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2431 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2432 match FILTER_PTID (leaving others pending). The PTIDs can be:
2433 minus_one_ptid, to specify any child; a pid PTID, specifying all
2434 lwps of a thread group; or a PTID representing a single lwp. Store
2435 the stop status through the status pointer WSTAT. OPTIONS is
2436 passed to the waitpid call. Return 0 if no event was found and
2437 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2438 was found. Return the PID of the stopped child otherwise. */
2441 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2442 int *wstatp
, int options
)
2444 struct thread_info
*event_thread
;
2445 struct lwp_info
*event_child
, *requested_child
;
2446 sigset_t block_mask
, prev_mask
;
2449 /* N.B. event_thread points to the thread_info struct that contains
2450 event_child. Keep them in sync. */
2451 event_thread
= NULL
;
2453 requested_child
= NULL
;
2455 /* Check for a lwp with a pending status. */
2457 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2459 event_thread
= (struct thread_info
*)
2460 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2461 if (event_thread
!= NULL
)
2462 event_child
= get_thread_lwp (event_thread
);
2463 if (debug_threads
&& event_thread
)
2464 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2466 else if (!ptid_equal (filter_ptid
, null_ptid
))
2468 requested_child
= find_lwp_pid (filter_ptid
);
2470 if (stopping_threads
== NOT_STOPPING_THREADS
2471 && requested_child
->status_pending_p
2472 && requested_child
->collecting_fast_tracepoint
)
2474 enqueue_one_deferred_signal (requested_child
,
2475 &requested_child
->status_pending
);
2476 requested_child
->status_pending_p
= 0;
2477 requested_child
->status_pending
= 0;
2478 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2481 if (requested_child
->suspended
2482 && requested_child
->status_pending_p
)
2484 internal_error (__FILE__
, __LINE__
,
2485 "requesting an event out of a"
2486 " suspended child?");
2489 if (requested_child
->status_pending_p
)
2491 event_child
= requested_child
;
2492 event_thread
= get_lwp_thread (event_child
);
2496 if (event_child
!= NULL
)
2499 debug_printf ("Got an event from pending child %ld (%04x)\n",
2500 lwpid_of (event_thread
), event_child
->status_pending
);
2501 *wstatp
= event_child
->status_pending
;
2502 event_child
->status_pending_p
= 0;
2503 event_child
->status_pending
= 0;
2504 current_thread
= event_thread
;
2505 return lwpid_of (event_thread
);
2508 /* But if we don't find a pending event, we'll have to wait.
2510 We only enter this loop if no process has a pending wait status.
2511 Thus any action taken in response to a wait status inside this
2512 loop is responding as soon as we detect the status, not after any
2515 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2516 all signals while here. */
2517 sigfillset (&block_mask
);
2518 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2520 /* Always pull all events out of the kernel. We'll randomly select
2521 an event LWP out of all that have events, to prevent
2523 while (event_child
== NULL
)
2527 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2530 - If the thread group leader exits while other threads in the
2531 thread group still exist, waitpid(TGID, ...) hangs. That
2532 waitpid won't return an exit status until the other threads
2533 in the group are reaped.
2535 - When a non-leader thread execs, that thread just vanishes
2536 without reporting an exit (so we'd hang if we waited for it
2537 explicitly in that case). The exec event is reported to
2540 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2543 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2544 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2550 debug_printf ("LLW: waitpid %ld received %s\n",
2551 (long) ret
, status_to_str (*wstatp
));
2554 /* Filter all events. IOW, leave all events pending. We'll
2555 randomly select an event LWP out of all that have events
2557 linux_low_filter_event (ret
, *wstatp
);
2558 /* Retry until nothing comes out of waitpid. A single
2559 SIGCHLD can indicate more than one child stopped. */
2563 /* Now that we've pulled all events out of the kernel, resume
2564 LWPs that don't have an interesting event to report. */
2565 if (stopping_threads
== NOT_STOPPING_THREADS
)
2566 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2568 /* ... and find an LWP with a status to report to the core, if
2570 event_thread
= (struct thread_info
*)
2571 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2572 if (event_thread
!= NULL
)
2574 event_child
= get_thread_lwp (event_thread
);
2575 *wstatp
= event_child
->status_pending
;
2576 event_child
->status_pending_p
= 0;
2577 event_child
->status_pending
= 0;
2581 /* Check for zombie thread group leaders. Those can't be reaped
2582 until all other threads in the thread group are. */
2583 check_zombie_leaders ();
2585 /* If there are no resumed children left in the set of LWPs we
2586 want to wait for, bail. We can't just block in
2587 waitpid/sigsuspend, because lwps might have been left stopped
2588 in trace-stop state, and we'd be stuck forever waiting for
2589 their status to change (which would only happen if we resumed
2590 them). Even if WNOHANG is set, this return code is preferred
2591 over 0 (below), as it is more detailed. */
2592 if ((find_inferior (&all_threads
,
2593 not_stopped_callback
,
2594 &wait_ptid
) == NULL
))
2597 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2598 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2602 /* No interesting event to report to the caller. */
2603 if ((options
& WNOHANG
))
2606 debug_printf ("WNOHANG set, no event found\n");
2608 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2612 /* Block until we get an event reported with SIGCHLD. */
2614 debug_printf ("sigsuspend'ing\n");
2616 sigsuspend (&prev_mask
);
2617 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2621 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2623 current_thread
= event_thread
;
2625 return lwpid_of (event_thread
);
2628 /* Wait for an event from child(ren) PTID. PTIDs can be:
2629 minus_one_ptid, to specify any child; a pid PTID, specifying all
2630 lwps of a thread group; or a PTID representing a single lwp. Store
2631 the stop status through the status pointer WSTAT. OPTIONS is
2632 passed to the waitpid call. Return 0 if no event was found and
2633 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2634 was found. Return the PID of the stopped child otherwise. */
2637 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2639 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2642 /* Count the LWP's that have had events. */
2645 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2647 struct thread_info
*thread
= (struct thread_info
*) entry
;
2648 struct lwp_info
*lp
= get_thread_lwp (thread
);
2649 int *count
= (int *) data
;
2651 gdb_assert (count
!= NULL
);
2653 /* Count only resumed LWPs that have an event pending. */
2654 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2655 && lp
->status_pending_p
)
2661 /* Select the LWP (if any) that is currently being single-stepped. */
2664 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2666 struct thread_info
*thread
= (struct thread_info
*) entry
;
2667 struct lwp_info
*lp
= get_thread_lwp (thread
);
2669 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2670 && thread
->last_resume_kind
== resume_step
2671 && lp
->status_pending_p
)
2677 /* Select the Nth LWP that has had an event. */
2680 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2682 struct thread_info
*thread
= (struct thread_info
*) entry
;
2683 struct lwp_info
*lp
= get_thread_lwp (thread
);
2684 int *selector
= (int *) data
;
2686 gdb_assert (selector
!= NULL
);
2688 /* Select only resumed LWPs that have an event pending. */
2689 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2690 && lp
->status_pending_p
)
2691 if ((*selector
)-- == 0)
2697 /* Select one LWP out of those that have events pending. */
2700 select_event_lwp (struct lwp_info
**orig_lp
)
2703 int random_selector
;
2704 struct thread_info
*event_thread
= NULL
;
2706 /* In all-stop, give preference to the LWP that is being
2707 single-stepped. There will be at most one, and it's the LWP that
2708 the core is most interested in. If we didn't do this, then we'd
2709 have to handle pending step SIGTRAPs somehow in case the core
2710 later continues the previously-stepped thread, otherwise we'd
2711 report the pending SIGTRAP, and the core, not having stepped the
2712 thread, wouldn't understand what the trap was for, and therefore
2713 would report it to the user as a random signal. */
2717 = (struct thread_info
*) find_inferior (&all_threads
,
2718 select_singlestep_lwp_callback
,
2720 if (event_thread
!= NULL
)
2723 debug_printf ("SEL: Select single-step %s\n",
2724 target_pid_to_str (ptid_of (event_thread
)));
2727 if (event_thread
== NULL
)
2729 /* No single-stepping LWP. Select one at random, out of those
2730 which have had events. */
2732 /* First see how many events we have. */
2733 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2734 gdb_assert (num_events
> 0);
2736 /* Now randomly pick a LWP out of those that have had
2738 random_selector
= (int)
2739 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2741 if (debug_threads
&& num_events
> 1)
2742 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2743 num_events
, random_selector
);
2746 = (struct thread_info
*) find_inferior (&all_threads
,
2747 select_event_lwp_callback
,
2751 if (event_thread
!= NULL
)
2753 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2755 /* Switch the event LWP. */
2756 *orig_lp
= event_lp
;
2760 /* Decrement the suspend count of an LWP. */
2763 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2765 struct thread_info
*thread
= (struct thread_info
*) entry
;
2766 struct lwp_info
*lwp
= get_thread_lwp (thread
);
2768 /* Ignore EXCEPT. */
2772 lwp_suspended_decr (lwp
);
2776 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2780 unsuspend_all_lwps (struct lwp_info
*except
)
2782 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
2785 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
2786 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
2788 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
2789 static ptid_t
linux_wait_1 (ptid_t ptid
,
2790 struct target_waitstatus
*ourstatus
,
2791 int target_options
);
2793 /* Stabilize threads (move out of jump pads).
2795 If a thread is midway collecting a fast tracepoint, we need to
2796 finish the collection and move it out of the jump pad before
2797 reporting the signal.
2799 This avoids recursion while collecting (when a signal arrives
2800 midway, and the signal handler itself collects), which would trash
2801 the trace buffer. In case the user set a breakpoint in a signal
2802 handler, this avoids the backtrace showing the jump pad, etc..
2803 Most importantly, there are certain things we can't do safely if
2804 threads are stopped in a jump pad (or in its callee's). For
2807 - starting a new trace run. A thread still collecting the
2808 previous run, could trash the trace buffer when resumed. The trace
2809 buffer control structures would have been reset but the thread had
2810 no way to tell. The thread could even midway memcpy'ing to the
2811 buffer, which would mean that when resumed, it would clobber the
2812 trace buffer that had been set for a new run.
2814 - we can't rewrite/reuse the jump pads for new tracepoints
2815 safely. Say you do tstart while a thread is stopped midway while
2816 collecting. When the thread is later resumed, it finishes the
2817 collection, and returns to the jump pad, to execute the original
2818 instruction that was under the tracepoint jump at the time the
2819 older run had been started. If the jump pad had been rewritten
2820 since for something else in the new run, the thread would now
2821 execute the wrong / random instructions. */
2824 linux_stabilize_threads (void)
2826 struct thread_info
*saved_thread
;
2827 struct thread_info
*thread_stuck
;
2830 = (struct thread_info
*) find_inferior (&all_threads
,
2831 stuck_in_jump_pad_callback
,
2833 if (thread_stuck
!= NULL
)
2836 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2837 lwpid_of (thread_stuck
));
2841 saved_thread
= current_thread
;
2843 stabilizing_threads
= 1;
2846 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
2848 /* Loop until all are stopped out of the jump pads. */
2849 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
2851 struct target_waitstatus ourstatus
;
2852 struct lwp_info
*lwp
;
2855 /* Note that we go through the full wait even loop. While
2856 moving threads out of jump pad, we need to be able to step
2857 over internal breakpoints and such. */
2858 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2860 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2862 lwp
= get_thread_lwp (current_thread
);
2865 lwp_suspended_inc (lwp
);
2867 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
2868 || current_thread
->last_resume_kind
== resume_stop
)
2870 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
2871 enqueue_one_deferred_signal (lwp
, &wstat
);
2876 find_inferior (&all_threads
, unsuspend_one_lwp
, NULL
);
2878 stabilizing_threads
= 0;
2880 current_thread
= saved_thread
;
2885 = (struct thread_info
*) find_inferior (&all_threads
,
2886 stuck_in_jump_pad_callback
,
2888 if (thread_stuck
!= NULL
)
2889 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
2890 lwpid_of (thread_stuck
));
2894 /* Convenience function that is called when the kernel reports an
2895 event that is not passed out to GDB. */
2898 ignore_event (struct target_waitstatus
*ourstatus
)
2900 /* If we got an event, there may still be others, as a single
2901 SIGCHLD can indicate more than one child stopped. This forces
2902 another target_wait call. */
2905 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2909 /* Convenience function that is called when the kernel reports an exit
2910 event. This decides whether to report the event to GDB as a
2911 process exit event, a thread exit event, or to suppress the
2915 filter_exit_event (struct lwp_info
*event_child
,
2916 struct target_waitstatus
*ourstatus
)
2918 struct thread_info
*thread
= get_lwp_thread (event_child
);
2919 ptid_t ptid
= ptid_of (thread
);
2921 if (!last_thread_of_process_p (pid_of (thread
)))
2923 if (report_thread_events
)
2924 ourstatus
->kind
= TARGET_WAITKIND_THREAD_EXITED
;
2926 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2928 delete_lwp (event_child
);
2933 /* Wait for process, returns status. */
2936 linux_wait_1 (ptid_t ptid
,
2937 struct target_waitstatus
*ourstatus
, int target_options
)
2940 struct lwp_info
*event_child
;
2943 int step_over_finished
;
2944 int bp_explains_trap
;
2945 int maybe_internal_trap
;
2953 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
2956 /* Translate generic target options into linux options. */
2958 if (target_options
& TARGET_WNOHANG
)
2961 bp_explains_trap
= 0;
2964 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2966 if (ptid_equal (step_over_bkpt
, null_ptid
))
2967 pid
= linux_wait_for_event (ptid
, &w
, options
);
2971 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
2972 target_pid_to_str (step_over_bkpt
));
2973 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
2978 gdb_assert (target_options
& TARGET_WNOHANG
);
2982 debug_printf ("linux_wait_1 ret = null_ptid, "
2983 "TARGET_WAITKIND_IGNORE\n");
2987 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2994 debug_printf ("linux_wait_1 ret = null_ptid, "
2995 "TARGET_WAITKIND_NO_RESUMED\n");
2999 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
3003 event_child
= get_thread_lwp (current_thread
);
3005 /* linux_wait_for_event only returns an exit status for the last
3006 child of a process. Report it. */
3007 if (WIFEXITED (w
) || WIFSIGNALED (w
))
3011 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
3012 ourstatus
->value
.integer
= WEXITSTATUS (w
);
3016 debug_printf ("linux_wait_1 ret = %s, exited with "
3018 target_pid_to_str (ptid_of (current_thread
)),
3025 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
3026 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
3030 debug_printf ("linux_wait_1 ret = %s, terminated with "
3032 target_pid_to_str (ptid_of (current_thread
)),
3038 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3039 return filter_exit_event (event_child
, ourstatus
);
3041 return ptid_of (current_thread
);
3044 /* If step-over executes a breakpoint instruction, it means a
3045 gdb/gdbserver breakpoint had been planted on top of a permanent
3046 breakpoint. The PC has been adjusted by
3047 check_stopped_by_breakpoint to point at the breakpoint address.
3048 Advance the PC manually past the breakpoint, otherwise the
3049 program would keep trapping the permanent breakpoint forever. */
3050 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3051 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
3053 int increment_pc
= 0;
3054 int breakpoint_kind
= 0;
3055 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3057 breakpoint_kind
= the_target
->breakpoint_kind_from_pc (&stop_pc
);
3058 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3062 debug_printf ("step-over for %s executed software breakpoint\n",
3063 target_pid_to_str (ptid_of (current_thread
)));
3066 if (increment_pc
!= 0)
3068 struct regcache
*regcache
3069 = get_thread_regcache (current_thread
, 1);
3071 event_child
->stop_pc
+= increment_pc
;
3072 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3074 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3075 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3079 /* If this event was not handled before, and is not a SIGTRAP, we
3080 report it. SIGILL and SIGSEGV are also treated as traps in case
3081 a breakpoint is inserted at the current PC. If this target does
3082 not support internal breakpoints at all, we also report the
3083 SIGTRAP without further processing; it's of no concern to us. */
3085 = (supports_breakpoints ()
3086 && (WSTOPSIG (w
) == SIGTRAP
3087 || ((WSTOPSIG (w
) == SIGILL
3088 || WSTOPSIG (w
) == SIGSEGV
)
3089 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3091 if (maybe_internal_trap
)
3093 /* Handle anything that requires bookkeeping before deciding to
3094 report the event or continue waiting. */
3096 /* First check if we can explain the SIGTRAP with an internal
3097 breakpoint, or if we should possibly report the event to GDB.
3098 Do this before anything that may remove or insert a
3100 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3102 /* We have a SIGTRAP, possibly a step-over dance has just
3103 finished. If so, tweak the state machine accordingly,
3104 reinsert breakpoints and delete any reinsert (software
3105 single-step) breakpoints. */
3106 step_over_finished
= finish_step_over (event_child
);
3108 /* Now invoke the callbacks of any internal breakpoints there. */
3109 check_breakpoints (event_child
->stop_pc
);
3111 /* Handle tracepoint data collecting. This may overflow the
3112 trace buffer, and cause a tracing stop, removing
3114 trace_event
= handle_tracepoints (event_child
);
3116 if (bp_explains_trap
)
3118 /* If we stepped or ran into an internal breakpoint, we've
3119 already handled it. So next time we resume (from this
3120 PC), we should step over it. */
3122 debug_printf ("Hit a gdbserver breakpoint.\n");
3124 if (breakpoint_here (event_child
->stop_pc
))
3125 event_child
->need_step_over
= 1;
3130 /* We have some other signal, possibly a step-over dance was in
3131 progress, and it should be cancelled too. */
3132 step_over_finished
= finish_step_over (event_child
);
3135 /* We have all the data we need. Either report the event to GDB, or
3136 resume threads and keep waiting for more. */
3138 /* If we're collecting a fast tracepoint, finish the collection and
3139 move out of the jump pad before delivering a signal. See
3140 linux_stabilize_threads. */
3143 && WSTOPSIG (w
) != SIGTRAP
3144 && supports_fast_tracepoints ()
3145 && agent_loaded_p ())
3148 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3149 "to defer or adjust it.\n",
3150 WSTOPSIG (w
), lwpid_of (current_thread
));
3152 /* Allow debugging the jump pad itself. */
3153 if (current_thread
->last_resume_kind
!= resume_step
3154 && maybe_move_out_of_jump_pad (event_child
, &w
))
3156 enqueue_one_deferred_signal (event_child
, &w
);
3159 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3160 WSTOPSIG (w
), lwpid_of (current_thread
));
3162 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3164 return ignore_event (ourstatus
);
3168 if (event_child
->collecting_fast_tracepoint
)
3171 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3172 "Check if we're already there.\n",
3173 lwpid_of (current_thread
),
3174 event_child
->collecting_fast_tracepoint
);
3178 event_child
->collecting_fast_tracepoint
3179 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3181 if (event_child
->collecting_fast_tracepoint
!= 1)
3183 /* No longer need this breakpoint. */
3184 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3187 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3188 "stopping all threads momentarily.\n");
3190 /* Other running threads could hit this breakpoint.
3191 We don't handle moribund locations like GDB does,
3192 instead we always pause all threads when removing
3193 breakpoints, so that any step-over or
3194 decr_pc_after_break adjustment is always taken
3195 care of while the breakpoint is still
3197 stop_all_lwps (1, event_child
);
3199 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3200 event_child
->exit_jump_pad_bkpt
= NULL
;
3202 unstop_all_lwps (1, event_child
);
3204 gdb_assert (event_child
->suspended
>= 0);
3208 if (event_child
->collecting_fast_tracepoint
== 0)
3211 debug_printf ("fast tracepoint finished "
3212 "collecting successfully.\n");
3214 /* We may have a deferred signal to report. */
3215 if (dequeue_one_deferred_signal (event_child
, &w
))
3218 debug_printf ("dequeued one signal.\n");
3223 debug_printf ("no deferred signals.\n");
3225 if (stabilizing_threads
)
3227 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3228 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3232 debug_printf ("linux_wait_1 ret = %s, stopped "
3233 "while stabilizing threads\n",
3234 target_pid_to_str (ptid_of (current_thread
)));
3238 return ptid_of (current_thread
);
3244 /* Check whether GDB would be interested in this event. */
3246 /* If GDB is not interested in this signal, don't stop other
3247 threads, and don't report it to GDB. Just resume the inferior
3248 right away. We do this for threading-related signals as well as
3249 any that GDB specifically requested we ignore. But never ignore
3250 SIGSTOP if we sent it ourselves, and do not ignore signals when
3251 stepping - they may require special handling to skip the signal
3252 handler. Also never ignore signals that could be caused by a
3254 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
3257 && current_thread
->last_resume_kind
!= resume_step
3259 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3260 (current_process ()->priv
->thread_db
!= NULL
3261 && (WSTOPSIG (w
) == __SIGRTMIN
3262 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3265 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3266 && !(WSTOPSIG (w
) == SIGSTOP
3267 && current_thread
->last_resume_kind
== resume_stop
)
3268 && !linux_wstatus_maybe_breakpoint (w
))))
3270 siginfo_t info
, *info_p
;
3273 debug_printf ("Ignored signal %d for LWP %ld.\n",
3274 WSTOPSIG (w
), lwpid_of (current_thread
));
3276 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3277 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3282 if (step_over_finished
)
3284 /* We cancelled this thread's step-over above. We still
3285 need to unsuspend all other LWPs, and set them back
3286 running again while the signal handler runs. */
3287 unsuspend_all_lwps (event_child
);
3289 /* Enqueue the pending signal info so that proceed_all_lwps
3291 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3293 proceed_all_lwps ();
3297 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3298 WSTOPSIG (w
), info_p
);
3300 return ignore_event (ourstatus
);
3303 /* Note that all addresses are always "out of the step range" when
3304 there's no range to begin with. */
3305 in_step_range
= lwp_in_step_range (event_child
);
3307 /* If GDB wanted this thread to single step, and the thread is out
3308 of the step range, we always want to report the SIGTRAP, and let
3309 GDB handle it. Watchpoints should always be reported. So should
3310 signals we can't explain. A SIGTRAP we can't explain could be a
3311 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3312 do, we're be able to handle GDB breakpoints on top of internal
3313 breakpoints, by handling the internal breakpoint and still
3314 reporting the event to GDB. If we don't, we're out of luck, GDB
3315 won't see the breakpoint hit. If we see a single-step event but
3316 the thread should be continuing, don't pass the trap to gdb.
3317 That indicates that we had previously finished a single-step but
3318 left the single-step pending -- see
3319 complete_ongoing_step_over. */
3320 report_to_gdb
= (!maybe_internal_trap
3321 || (current_thread
->last_resume_kind
== resume_step
3323 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3325 && !bp_explains_trap
3327 && !step_over_finished
3328 && !(current_thread
->last_resume_kind
== resume_continue
3329 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3330 || (gdb_breakpoint_here (event_child
->stop_pc
)
3331 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3332 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3333 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3335 run_breakpoint_commands (event_child
->stop_pc
);
3337 /* We found no reason GDB would want us to stop. We either hit one
3338 of our own breakpoints, or finished an internal step GDB
3339 shouldn't know about. */
3344 if (bp_explains_trap
)
3345 debug_printf ("Hit a gdbserver breakpoint.\n");
3346 if (step_over_finished
)
3347 debug_printf ("Step-over finished.\n");
3349 debug_printf ("Tracepoint event.\n");
3350 if (lwp_in_step_range (event_child
))
3351 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3352 paddress (event_child
->stop_pc
),
3353 paddress (event_child
->step_range_start
),
3354 paddress (event_child
->step_range_end
));
3357 /* We're not reporting this breakpoint to GDB, so apply the
3358 decr_pc_after_break adjustment to the inferior's regcache
3361 if (the_low_target
.set_pc
!= NULL
)
3363 struct regcache
*regcache
3364 = get_thread_regcache (current_thread
, 1);
3365 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3368 /* We may have finished stepping over a breakpoint. If so,
3369 we've stopped and suspended all LWPs momentarily except the
3370 stepping one. This is where we resume them all again. We're
3371 going to keep waiting, so use proceed, which handles stepping
3372 over the next breakpoint. */
3374 debug_printf ("proceeding all threads.\n");
3376 if (step_over_finished
)
3377 unsuspend_all_lwps (event_child
);
3379 proceed_all_lwps ();
3380 return ignore_event (ourstatus
);
3385 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3389 str
= target_waitstatus_to_string (&event_child
->waitstatus
);
3390 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3391 lwpid_of (get_lwp_thread (event_child
)), str
);
3394 if (current_thread
->last_resume_kind
== resume_step
)
3396 if (event_child
->step_range_start
== event_child
->step_range_end
)
3397 debug_printf ("GDB wanted to single-step, reporting event.\n");
3398 else if (!lwp_in_step_range (event_child
))
3399 debug_printf ("Out of step range, reporting event.\n");
3401 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3402 debug_printf ("Stopped by watchpoint.\n");
3403 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3404 debug_printf ("Stopped by GDB breakpoint.\n");
3406 debug_printf ("Hit a non-gdbserver trap event.\n");
3409 /* Alright, we're going to report a stop. */
3411 if (!stabilizing_threads
)
3413 /* In all-stop, stop all threads. */
3415 stop_all_lwps (0, NULL
);
3417 /* If we're not waiting for a specific LWP, choose an event LWP
3418 from among those that have had events. Giving equal priority
3419 to all LWPs that have had events helps prevent
3421 if (ptid_equal (ptid
, minus_one_ptid
))
3423 event_child
->status_pending_p
= 1;
3424 event_child
->status_pending
= w
;
3426 select_event_lwp (&event_child
);
3428 /* current_thread and event_child must stay in sync. */
3429 current_thread
= get_lwp_thread (event_child
);
3431 event_child
->status_pending_p
= 0;
3432 w
= event_child
->status_pending
;
3435 if (step_over_finished
)
3439 /* If we were doing a step-over, all other threads but
3440 the stepping one had been paused in start_step_over,
3441 with their suspend counts incremented. We don't want
3442 to do a full unstop/unpause, because we're in
3443 all-stop mode (so we want threads stopped), but we
3444 still need to unsuspend the other threads, to
3445 decrement their `suspended' count back. */
3446 unsuspend_all_lwps (event_child
);
3450 /* If we just finished a step-over, then all threads had
3451 been momentarily paused. In all-stop, that's fine,
3452 we want threads stopped by now anyway. In non-stop,
3453 we need to re-resume threads that GDB wanted to be
3455 unstop_all_lwps (1, event_child
);
3459 /* Stabilize threads (move out of jump pads). */
3461 stabilize_threads ();
3465 /* If we just finished a step-over, then all threads had been
3466 momentarily paused. In all-stop, that's fine, we want
3467 threads stopped by now anyway. In non-stop, we need to
3468 re-resume threads that GDB wanted to be running. */
3469 if (step_over_finished
)
3470 unstop_all_lwps (1, event_child
);
3473 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3475 /* If the reported event is an exit, fork, vfork or exec, let
3477 *ourstatus
= event_child
->waitstatus
;
3478 /* Clear the event lwp's waitstatus since we handled it already. */
3479 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3482 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3484 /* Now that we've selected our final event LWP, un-adjust its PC if
3485 it was a software breakpoint, and the client doesn't know we can
3486 adjust the breakpoint ourselves. */
3487 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3488 && !swbreak_feature
)
3490 int decr_pc
= the_low_target
.decr_pc_after_break
;
3494 struct regcache
*regcache
3495 = get_thread_regcache (current_thread
, 1);
3496 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3500 if (current_thread
->last_resume_kind
== resume_stop
3501 && WSTOPSIG (w
) == SIGSTOP
)
3503 /* A thread that has been requested to stop by GDB with vCont;t,
3504 and it stopped cleanly, so report as SIG0. The use of
3505 SIGSTOP is an implementation detail. */
3506 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3508 else if (current_thread
->last_resume_kind
== resume_stop
3509 && WSTOPSIG (w
) != SIGSTOP
)
3511 /* A thread that has been requested to stop by GDB with vCont;t,
3512 but, it stopped for other reasons. */
3513 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3515 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3517 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3520 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3524 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3525 target_pid_to_str (ptid_of (current_thread
)),
3526 ourstatus
->kind
, ourstatus
->value
.sig
);
3530 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
3531 return filter_exit_event (event_child
, ourstatus
);
3533 return ptid_of (current_thread
);
3536 /* Get rid of any pending event in the pipe. */
3538 async_file_flush (void)
3544 ret
= read (linux_event_pipe
[0], &buf
, 1);
3545 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3548 /* Put something in the pipe, so the event loop wakes up. */
3550 async_file_mark (void)
3554 async_file_flush ();
3557 ret
= write (linux_event_pipe
[1], "+", 1);
3558 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3560 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3561 be awakened anyway. */
3565 linux_wait (ptid_t ptid
,
3566 struct target_waitstatus
*ourstatus
, int target_options
)
3570 /* Flush the async file first. */
3571 if (target_is_async_p ())
3572 async_file_flush ();
3576 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3578 while ((target_options
& TARGET_WNOHANG
) == 0
3579 && ptid_equal (event_ptid
, null_ptid
)
3580 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3582 /* If at least one stop was reported, there may be more. A single
3583 SIGCHLD can signal more than one child stop. */
3584 if (target_is_async_p ()
3585 && (target_options
& TARGET_WNOHANG
) != 0
3586 && !ptid_equal (event_ptid
, null_ptid
))
3592 /* Send a signal to an LWP. */
3595 kill_lwp (unsigned long lwpid
, int signo
)
3597 /* Use tkill, if possible, in case we are using nptl threads. If tkill
3598 fails, then we are not using nptl threads and we should be using kill. */
3602 static int tkill_failed
;
3609 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3610 if (errno
!= ENOSYS
)
3617 return kill (lwpid
, signo
);
3621 linux_stop_lwp (struct lwp_info
*lwp
)
3627 send_sigstop (struct lwp_info
*lwp
)
3631 pid
= lwpid_of (get_lwp_thread (lwp
));
3633 /* If we already have a pending stop signal for this process, don't
3635 if (lwp
->stop_expected
)
3638 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3644 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3646 lwp
->stop_expected
= 1;
3647 kill_lwp (pid
, SIGSTOP
);
3651 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
3653 struct thread_info
*thread
= (struct thread_info
*) entry
;
3654 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3656 /* Ignore EXCEPT. */
3667 /* Increment the suspend count of an LWP, and stop it, if not stopped
3670 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
3673 struct thread_info
*thread
= (struct thread_info
*) entry
;
3674 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3676 /* Ignore EXCEPT. */
3680 lwp_suspended_inc (lwp
);
3682 return send_sigstop_callback (entry
, except
);
3686 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3688 /* Store the exit status for later. */
3689 lwp
->status_pending_p
= 1;
3690 lwp
->status_pending
= wstat
;
3692 /* Store in waitstatus as well, as there's nothing else to process
3694 if (WIFEXITED (wstat
))
3696 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
3697 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
3699 else if (WIFSIGNALED (wstat
))
3701 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
3702 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
3705 /* Prevent trying to stop it. */
3708 /* No further stops are expected from a dead lwp. */
3709 lwp
->stop_expected
= 0;
3712 /* Return true if LWP has exited already, and has a pending exit event
3713 to report to GDB. */
3716 lwp_is_marked_dead (struct lwp_info
*lwp
)
3718 return (lwp
->status_pending_p
3719 && (WIFEXITED (lwp
->status_pending
)
3720 || WIFSIGNALED (lwp
->status_pending
)));
3723 /* Wait for all children to stop for the SIGSTOPs we just queued. */
3726 wait_for_sigstop (void)
3728 struct thread_info
*saved_thread
;
3733 saved_thread
= current_thread
;
3734 if (saved_thread
!= NULL
)
3735 saved_tid
= saved_thread
->entry
.id
;
3737 saved_tid
= null_ptid
; /* avoid bogus unused warning */
3740 debug_printf ("wait_for_sigstop: pulling events\n");
3742 /* Passing NULL_PTID as filter indicates we want all events to be
3743 left pending. Eventually this returns when there are no
3744 unwaited-for children left. */
3745 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
3747 gdb_assert (ret
== -1);
3749 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
3750 current_thread
= saved_thread
;
3754 debug_printf ("Previously current thread died.\n");
3756 /* We can't change the current inferior behind GDB's back,
3757 otherwise, a subsequent command may apply to the wrong
3759 current_thread
= NULL
;
3763 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
3764 move it out, because we need to report the stop event to GDB. For
3765 example, if the user puts a breakpoint in the jump pad, it's
3766 because she wants to debug it. */
3769 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
3771 struct thread_info
*thread
= (struct thread_info
*) entry
;
3772 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3774 if (lwp
->suspended
!= 0)
3776 internal_error (__FILE__
, __LINE__
,
3777 "LWP %ld is suspended, suspended=%d\n",
3778 lwpid_of (thread
), lwp
->suspended
);
3780 gdb_assert (lwp
->stopped
);
3782 /* Allow debugging the jump pad, gdb_collect, etc.. */
3783 return (supports_fast_tracepoints ()
3784 && agent_loaded_p ()
3785 && (gdb_breakpoint_here (lwp
->stop_pc
)
3786 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3787 || thread
->last_resume_kind
== resume_step
)
3788 && linux_fast_tracepoint_collecting (lwp
, NULL
));
3792 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
3794 struct thread_info
*thread
= (struct thread_info
*) entry
;
3795 struct thread_info
*saved_thread
;
3796 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3799 if (lwp
->suspended
!= 0)
3801 internal_error (__FILE__
, __LINE__
,
3802 "LWP %ld is suspended, suspended=%d\n",
3803 lwpid_of (thread
), lwp
->suspended
);
3805 gdb_assert (lwp
->stopped
);
3807 /* For gdb_breakpoint_here. */
3808 saved_thread
= current_thread
;
3809 current_thread
= thread
;
3811 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
3813 /* Allow debugging the jump pad, gdb_collect, etc. */
3814 if (!gdb_breakpoint_here (lwp
->stop_pc
)
3815 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
3816 && thread
->last_resume_kind
!= resume_step
3817 && maybe_move_out_of_jump_pad (lwp
, wstat
))
3820 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
3825 lwp
->status_pending_p
= 0;
3826 enqueue_one_deferred_signal (lwp
, wstat
);
3829 debug_printf ("Signal %d for LWP %ld deferred "
3831 WSTOPSIG (*wstat
), lwpid_of (thread
));
3834 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
3837 lwp_suspended_inc (lwp
);
3839 current_thread
= saved_thread
;
3843 lwp_running (struct inferior_list_entry
*entry
, void *data
)
3845 struct thread_info
*thread
= (struct thread_info
*) entry
;
3846 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3848 if (lwp_is_marked_dead (lwp
))
3855 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
3856 If SUSPEND, then also increase the suspend count of every LWP,
3860 stop_all_lwps (int suspend
, struct lwp_info
*except
)
3862 /* Should not be called recursively. */
3863 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
3868 debug_printf ("stop_all_lwps (%s, except=%s)\n",
3869 suspend
? "stop-and-suspend" : "stop",
3871 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
3875 stopping_threads
= (suspend
3876 ? STOPPING_AND_SUSPENDING_THREADS
3877 : STOPPING_THREADS
);
3880 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
3882 find_inferior (&all_threads
, send_sigstop_callback
, except
);
3883 wait_for_sigstop ();
3884 stopping_threads
= NOT_STOPPING_THREADS
;
3888 debug_printf ("stop_all_lwps done, setting stopping_threads "
3889 "back to !stopping\n");
3894 /* Enqueue one signal in the chain of signals which need to be
3895 delivered to this process on next resume. */
3898 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
3900 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
3902 p_sig
->prev
= lwp
->pending_signals
;
3903 p_sig
->signal
= signal
;
3905 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3907 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3908 lwp
->pending_signals
= p_sig
;
3911 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
3912 SIGNAL is nonzero, give it that signal. */
3915 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
3916 int step
, int signal
, siginfo_t
*info
)
3918 struct thread_info
*thread
= get_lwp_thread (lwp
);
3919 struct thread_info
*saved_thread
;
3920 int fast_tp_collecting
;
3921 struct process_info
*proc
= get_thread_process (thread
);
3923 /* Note that target description may not be initialised
3924 (proc->tdesc == NULL) at this point because the program hasn't
3925 stopped at the first instruction yet. It means GDBserver skips
3926 the extra traps from the wrapper program (see option --wrapper).
3927 Code in this function that requires register access should be
3928 guarded by proc->tdesc == NULL or something else. */
3930 if (lwp
->stopped
== 0)
3933 gdb_assert (lwp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
);
3935 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
3937 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
3939 /* Cancel actions that rely on GDB not changing the PC (e.g., the
3940 user used the "jump" command, or "set $pc = foo"). */
3941 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
3943 /* Collecting 'while-stepping' actions doesn't make sense
3945 release_while_stepping_state_list (thread
);
3948 /* If we have pending signals or status, and a new signal, enqueue the
3949 signal. Also enqueue the signal if we are waiting to reinsert a
3950 breakpoint; it will be picked up again below. */
3952 && (lwp
->status_pending_p
3953 || lwp
->pending_signals
!= NULL
3954 || lwp
->bp_reinsert
!= 0
3955 || fast_tp_collecting
))
3957 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
3959 p_sig
->prev
= lwp
->pending_signals
;
3960 p_sig
->signal
= signal
;
3962 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3964 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3965 lwp
->pending_signals
= p_sig
;
3968 if (lwp
->status_pending_p
)
3971 debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);"
3972 " has pending status\n",
3973 lwpid_of (thread
), step
? "step" : "continue", signal
,
3974 lwp
->stop_expected
? "expected" : "not expected");
3978 saved_thread
= current_thread
;
3979 current_thread
= thread
;
3982 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
3983 lwpid_of (thread
), step
? "step" : "continue", signal
,
3984 lwp
->stop_expected
? "expected" : "not expected");
3986 /* This bit needs some thinking about. If we get a signal that
3987 we must report while a single-step reinsert is still pending,
3988 we often end up resuming the thread. It might be better to
3989 (ew) allow a stack of pending events; then we could be sure that
3990 the reinsert happened right away and not lose any signals.
3992 Making this stack would also shrink the window in which breakpoints are
3993 uninserted (see comment in linux_wait_for_lwp) but not enough for
3994 complete correctness, so it won't solve that problem. It may be
3995 worthwhile just to solve this one, however. */
3996 if (lwp
->bp_reinsert
!= 0)
3999 debug_printf (" pending reinsert at 0x%s\n",
4000 paddress (lwp
->bp_reinsert
));
4002 if (can_hardware_single_step ())
4004 if (fast_tp_collecting
== 0)
4007 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
4009 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
4016 /* Postpone any pending signal. It was enqueued above. */
4020 if (fast_tp_collecting
== 1)
4023 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4024 " (exit-jump-pad-bkpt)\n",
4027 /* Postpone any pending signal. It was enqueued above. */
4030 else if (fast_tp_collecting
== 2)
4033 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4034 " single-stepping\n",
4037 if (can_hardware_single_step ())
4041 internal_error (__FILE__
, __LINE__
,
4042 "moving out of jump pad single-stepping"
4043 " not implemented on this target");
4046 /* Postpone any pending signal. It was enqueued above. */
4050 /* If we have while-stepping actions in this thread set it stepping.
4051 If we have a signal to deliver, it may or may not be set to
4052 SIG_IGN, we don't know. Assume so, and allow collecting
4053 while-stepping into a signal handler. A possible smart thing to
4054 do would be to set an internal breakpoint at the signal return
4055 address, continue, and carry on catching this while-stepping
4056 action only when that breakpoint is hit. A future
4058 if (thread
->while_stepping
!= NULL
4059 && can_hardware_single_step ())
4062 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4067 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4069 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4071 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4075 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4076 (long) lwp
->stop_pc
);
4080 /* If we have pending signals, consume one unless we are trying to
4081 reinsert a breakpoint or we're trying to finish a fast tracepoint
4083 if (lwp
->pending_signals
!= NULL
4084 && lwp
->bp_reinsert
== 0
4085 && fast_tp_collecting
== 0)
4087 struct pending_signals
**p_sig
;
4089 p_sig
= &lwp
->pending_signals
;
4090 while ((*p_sig
)->prev
!= NULL
)
4091 p_sig
= &(*p_sig
)->prev
;
4093 signal
= (*p_sig
)->signal
;
4094 if ((*p_sig
)->info
.si_signo
!= 0)
4095 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4102 if (the_low_target
.prepare_to_resume
!= NULL
)
4103 the_low_target
.prepare_to_resume (lwp
);
4105 regcache_invalidate_thread (thread
);
4107 lwp
->stepping
= step
;
4108 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (thread
),
4109 (PTRACE_TYPE_ARG3
) 0,
4110 /* Coerce to a uintptr_t first to avoid potential gcc warning
4111 of coercing an 8 byte integer to a 4 byte pointer. */
4112 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4114 current_thread
= saved_thread
;
4116 perror_with_name ("resuming thread");
4118 /* Successfully resumed. Clear state that no longer makes sense,
4119 and mark the LWP as running. Must not do this before resuming
4120 otherwise if that fails other code will be confused. E.g., we'd
4121 later try to stop the LWP and hang forever waiting for a stop
4122 status. Note that we must not throw after this is cleared,
4123 otherwise handle_zombie_lwp_error would get confused. */
4125 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4128 /* Called when we try to resume a stopped LWP and that errors out. If
4129 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4130 or about to become), discard the error, clear any pending status
4131 the LWP may have, and return true (we'll collect the exit status
4132 soon enough). Otherwise, return false. */
4135 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4137 struct thread_info
*thread
= get_lwp_thread (lp
);
4139 /* If we get an error after resuming the LWP successfully, we'd
4140 confuse !T state for the LWP being gone. */
4141 gdb_assert (lp
->stopped
);
4143 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4144 because even if ptrace failed with ESRCH, the tracee may be "not
4145 yet fully dead", but already refusing ptrace requests. In that
4146 case the tracee has 'R (Running)' state for a little bit
4147 (observed in Linux 3.18). See also the note on ESRCH in the
4148 ptrace(2) man page. Instead, check whether the LWP has any state
4149 other than ptrace-stopped. */
4151 /* Don't assume anything if /proc/PID/status can't be read. */
4152 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4154 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4155 lp
->status_pending_p
= 0;
4161 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4162 disappears while we try to resume it. */
4165 linux_resume_one_lwp (struct lwp_info
*lwp
,
4166 int step
, int signal
, siginfo_t
*info
)
4170 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4172 CATCH (ex
, RETURN_MASK_ERROR
)
4174 if (!check_ptrace_stopped_lwp_gone (lwp
))
4175 throw_exception (ex
);
4180 struct thread_resume_array
4182 struct thread_resume
*resume
;
4186 /* This function is called once per thread via find_inferior.
4187 ARG is a pointer to a thread_resume_array struct.
4188 We look up the thread specified by ENTRY in ARG, and mark the thread
4189 with a pointer to the appropriate resume request.
4191 This algorithm is O(threads * resume elements), but resume elements
4192 is small (and will remain small at least until GDB supports thread
4196 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
4198 struct thread_info
*thread
= (struct thread_info
*) entry
;
4199 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4201 struct thread_resume_array
*r
;
4203 r
= (struct thread_resume_array
*) arg
;
4205 for (ndx
= 0; ndx
< r
->n
; ndx
++)
4207 ptid_t ptid
= r
->resume
[ndx
].thread
;
4208 if (ptid_equal (ptid
, minus_one_ptid
)
4209 || ptid_equal (ptid
, entry
->id
)
4210 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4212 || (ptid_get_pid (ptid
) == pid_of (thread
)
4213 && (ptid_is_pid (ptid
)
4214 || ptid_get_lwp (ptid
) == -1)))
4216 if (r
->resume
[ndx
].kind
== resume_stop
4217 && thread
->last_resume_kind
== resume_stop
)
4220 debug_printf ("already %s LWP %ld at GDB's request\n",
4221 (thread
->last_status
.kind
4222 == TARGET_WAITKIND_STOPPED
)
4230 lwp
->resume
= &r
->resume
[ndx
];
4231 thread
->last_resume_kind
= lwp
->resume
->kind
;
4233 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4234 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4236 /* If we had a deferred signal to report, dequeue one now.
4237 This can happen if LWP gets more than one signal while
4238 trying to get out of a jump pad. */
4240 && !lwp
->status_pending_p
4241 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4243 lwp
->status_pending_p
= 1;
4246 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4247 "leaving status pending.\n",
4248 WSTOPSIG (lwp
->status_pending
),
4256 /* No resume action for this thread. */
4262 /* find_inferior callback for linux_resume.
4263 Set *FLAG_P if this lwp has an interesting status pending. */
4266 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
4268 struct thread_info
*thread
= (struct thread_info
*) entry
;
4269 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4271 /* LWPs which will not be resumed are not interesting, because
4272 we might not wait for them next time through linux_wait. */
4273 if (lwp
->resume
== NULL
)
4276 if (thread_still_has_status_pending_p (thread
))
4277 * (int *) flag_p
= 1;
4282 /* Return 1 if this lwp that GDB wants running is stopped at an
4283 internal breakpoint that we need to step over. It assumes that any
4284 required STOP_PC adjustment has already been propagated to the
4285 inferior's regcache. */
4288 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
4290 struct thread_info
*thread
= (struct thread_info
*) entry
;
4291 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4292 struct thread_info
*saved_thread
;
4294 struct process_info
*proc
= get_thread_process (thread
);
4296 /* GDBserver is skipping the extra traps from the wrapper program,
4297 don't have to do step over. */
4298 if (proc
->tdesc
== NULL
)
4301 /* LWPs which will not be resumed are not interesting, because we
4302 might not wait for them next time through linux_wait. */
4307 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4312 if (thread
->last_resume_kind
== resume_stop
)
4315 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4321 gdb_assert (lwp
->suspended
>= 0);
4326 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4331 if (!lwp
->need_step_over
)
4334 debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread
));
4337 if (lwp
->status_pending_p
)
4340 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4346 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4350 /* If the PC has changed since we stopped, then don't do anything,
4351 and let the breakpoint/tracepoint be hit. This happens if, for
4352 instance, GDB handled the decr_pc_after_break subtraction itself,
4353 GDB is OOL stepping this thread, or the user has issued a "jump"
4354 command, or poked thread's registers herself. */
4355 if (pc
!= lwp
->stop_pc
)
4358 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4359 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4361 paddress (lwp
->stop_pc
), paddress (pc
));
4363 lwp
->need_step_over
= 0;
4367 saved_thread
= current_thread
;
4368 current_thread
= thread
;
4370 /* We can only step over breakpoints we know about. */
4371 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4373 /* Don't step over a breakpoint that GDB expects to hit
4374 though. If the condition is being evaluated on the target's side
4375 and it evaluate to false, step over this breakpoint as well. */
4376 if (gdb_breakpoint_here (pc
)
4377 && gdb_condition_true_at_breakpoint (pc
)
4378 && gdb_no_commands_at_breakpoint (pc
))
4381 debug_printf ("Need step over [LWP %ld]? yes, but found"
4382 " GDB breakpoint at 0x%s; skipping step over\n",
4383 lwpid_of (thread
), paddress (pc
));
4385 current_thread
= saved_thread
;
4391 debug_printf ("Need step over [LWP %ld]? yes, "
4392 "found breakpoint at 0x%s\n",
4393 lwpid_of (thread
), paddress (pc
));
4395 /* We've found an lwp that needs stepping over --- return 1 so
4396 that find_inferior stops looking. */
4397 current_thread
= saved_thread
;
4399 /* If the step over is cancelled, this is set again. */
4400 lwp
->need_step_over
= 0;
4405 current_thread
= saved_thread
;
4408 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4410 lwpid_of (thread
), paddress (pc
));
4415 /* Start a step-over operation on LWP. When LWP stopped at a
4416 breakpoint, to make progress, we need to remove the breakpoint out
4417 of the way. If we let other threads run while we do that, they may
4418 pass by the breakpoint location and miss hitting it. To avoid
4419 that, a step-over momentarily stops all threads while LWP is
4420 single-stepped while the breakpoint is temporarily uninserted from
4421 the inferior. When the single-step finishes, we reinsert the
4422 breakpoint, and let all threads that are supposed to be running,
4425 On targets that don't support hardware single-step, we don't
4426 currently support full software single-stepping. Instead, we only
4427 support stepping over the thread event breakpoint, by asking the
4428 low target where to place a reinsert breakpoint. Since this
4429 routine assumes the breakpoint being stepped over is a thread event
4430 breakpoint, it usually assumes the return address of the current
4431 function is a good enough place to set the reinsert breakpoint. */
4434 start_step_over (struct lwp_info
*lwp
)
4436 struct thread_info
*thread
= get_lwp_thread (lwp
);
4437 struct thread_info
*saved_thread
;
4442 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4445 stop_all_lwps (1, lwp
);
4447 if (lwp
->suspended
!= 0)
4449 internal_error (__FILE__
, __LINE__
,
4450 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4455 debug_printf ("Done stopping all threads for step-over.\n");
4457 /* Note, we should always reach here with an already adjusted PC,
4458 either by GDB (if we're resuming due to GDB's request), or by our
4459 caller, if we just finished handling an internal breakpoint GDB
4460 shouldn't care about. */
4463 saved_thread
= current_thread
;
4464 current_thread
= thread
;
4466 lwp
->bp_reinsert
= pc
;
4467 uninsert_breakpoints_at (pc
);
4468 uninsert_fast_tracepoint_jumps_at (pc
);
4470 if (can_hardware_single_step ())
4476 CORE_ADDR raddr
= (*the_low_target
.breakpoint_reinsert_addr
) ();
4477 set_reinsert_breakpoint (raddr
);
4481 current_thread
= saved_thread
;
4483 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4485 /* Require next event from this LWP. */
4486 step_over_bkpt
= thread
->entry
.id
;
4490 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4491 start_step_over, if still there, and delete any reinsert
4492 breakpoints we've set, on non hardware single-step targets. */
4495 finish_step_over (struct lwp_info
*lwp
)
4497 if (lwp
->bp_reinsert
!= 0)
4500 debug_printf ("Finished step over.\n");
4502 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4503 may be no breakpoint to reinsert there by now. */
4504 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4505 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4507 lwp
->bp_reinsert
= 0;
4509 /* Delete any software-single-step reinsert breakpoints. No
4510 longer needed. We don't have to worry about other threads
4511 hitting this trap, and later not being able to explain it,
4512 because we were stepping over a breakpoint, and we hold all
4513 threads but LWP stopped while doing that. */
4514 if (!can_hardware_single_step ())
4515 delete_reinsert_breakpoints ();
4517 step_over_bkpt
= null_ptid
;
4524 /* If there's a step over in progress, wait until all threads stop
4525 (that is, until the stepping thread finishes its step), and
4526 unsuspend all lwps. The stepping thread ends with its status
4527 pending, which is processed later when we get back to processing
4531 complete_ongoing_step_over (void)
4533 if (!ptid_equal (step_over_bkpt
, null_ptid
))
4535 struct lwp_info
*lwp
;
4540 debug_printf ("detach: step over in progress, finish it first\n");
4542 /* Passing NULL_PTID as filter indicates we want all events to
4543 be left pending. Eventually this returns when there are no
4544 unwaited-for children left. */
4545 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4547 gdb_assert (ret
== -1);
4549 lwp
= find_lwp_pid (step_over_bkpt
);
4551 finish_step_over (lwp
);
4552 step_over_bkpt
= null_ptid
;
4553 unsuspend_all_lwps (lwp
);
4557 /* This function is called once per thread. We check the thread's resume
4558 request, which will tell us whether to resume, step, or leave the thread
4559 stopped; and what signal, if any, it should be sent.
4561 For threads which we aren't explicitly told otherwise, we preserve
4562 the stepping flag; this is used for stepping over gdbserver-placed
4565 If pending_flags was set in any thread, we queue any needed
4566 signals, since we won't actually resume. We already have a pending
4567 event to report, so we don't need to preserve any step requests;
4568 they should be re-issued if necessary. */
4571 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
4573 struct thread_info
*thread
= (struct thread_info
*) entry
;
4574 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4576 int leave_all_stopped
= * (int *) arg
;
4579 if (lwp
->resume
== NULL
)
4582 if (lwp
->resume
->kind
== resume_stop
)
4585 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4590 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
4592 /* Stop the thread, and wait for the event asynchronously,
4593 through the event loop. */
4599 debug_printf ("already stopped LWP %ld\n",
4602 /* The LWP may have been stopped in an internal event that
4603 was not meant to be notified back to GDB (e.g., gdbserver
4604 breakpoint), so we should be reporting a stop event in
4607 /* If the thread already has a pending SIGSTOP, this is a
4608 no-op. Otherwise, something later will presumably resume
4609 the thread and this will cause it to cancel any pending
4610 operation, due to last_resume_kind == resume_stop. If
4611 the thread already has a pending status to report, we
4612 will still report it the next time we wait - see
4613 status_pending_p_callback. */
4615 /* If we already have a pending signal to report, then
4616 there's no need to queue a SIGSTOP, as this means we're
4617 midway through moving the LWP out of the jumppad, and we
4618 will report the pending signal as soon as that is
4620 if (lwp
->pending_signals_to_report
== NULL
)
4624 /* For stop requests, we're done. */
4626 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4630 /* If this thread which is about to be resumed has a pending status,
4631 then don't resume it - we can just report the pending status.
4632 Likewise if it is suspended, because e.g., another thread is
4633 stepping past a breakpoint. Make sure to queue any signals that
4634 would otherwise be sent. In all-stop mode, we do this decision
4635 based on if *any* thread has a pending status. If there's a
4636 thread that needs the step-over-breakpoint dance, then don't
4637 resume any other thread but that particular one. */
4638 leave_pending
= (lwp
->suspended
4639 || lwp
->status_pending_p
4640 || leave_all_stopped
);
4645 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
4647 step
= (lwp
->resume
->kind
== resume_step
);
4648 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
4653 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
4655 /* If we have a new signal, enqueue the signal. */
4656 if (lwp
->resume
->sig
!= 0)
4658 struct pending_signals
*p_sig
= XCNEW (struct pending_signals
);
4660 p_sig
->prev
= lwp
->pending_signals
;
4661 p_sig
->signal
= lwp
->resume
->sig
;
4663 /* If this is the same signal we were previously stopped by,
4664 make sure to queue its siginfo. We can ignore the return
4665 value of ptrace; if it fails, we'll skip
4666 PTRACE_SETSIGINFO. */
4667 if (WIFSTOPPED (lwp
->last_status
)
4668 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
4669 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4672 lwp
->pending_signals
= p_sig
;
4676 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4682 linux_resume (struct thread_resume
*resume_info
, size_t n
)
4684 struct thread_resume_array array
= { resume_info
, n
};
4685 struct thread_info
*need_step_over
= NULL
;
4687 int leave_all_stopped
;
4692 debug_printf ("linux_resume:\n");
4695 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
4697 /* If there is a thread which would otherwise be resumed, which has
4698 a pending status, then don't resume any threads - we can just
4699 report the pending status. Make sure to queue any signals that
4700 would otherwise be sent. In non-stop mode, we'll apply this
4701 logic to each thread individually. We consume all pending events
4702 before considering to start a step-over (in all-stop). */
4705 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
4707 /* If there is a thread which would otherwise be resumed, which is
4708 stopped at a breakpoint that needs stepping over, then don't
4709 resume any threads - have it step over the breakpoint with all
4710 other threads stopped, then resume all threads again. Make sure
4711 to queue any signals that would otherwise be delivered or
4713 if (!any_pending
&& supports_breakpoints ())
4715 = (struct thread_info
*) find_inferior (&all_threads
,
4716 need_step_over_p
, NULL
);
4718 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
4722 if (need_step_over
!= NULL
)
4723 debug_printf ("Not resuming all, need step over\n");
4724 else if (any_pending
)
4725 debug_printf ("Not resuming, all-stop and found "
4726 "an LWP with pending status\n");
4728 debug_printf ("Resuming, no pending status or step over needed\n");
4731 /* Even if we're leaving threads stopped, queue all signals we'd
4732 otherwise deliver. */
4733 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
4736 start_step_over (get_thread_lwp (need_step_over
));
4740 debug_printf ("linux_resume done\n");
4745 /* This function is called once per thread. We check the thread's
4746 last resume request, which will tell us whether to resume, step, or
4747 leave the thread stopped. Any signal the client requested to be
4748 delivered has already been enqueued at this point.
4750 If any thread that GDB wants running is stopped at an internal
4751 breakpoint that needs stepping over, we start a step-over operation
4752 on that particular thread, and leave all others stopped. */
4755 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4757 struct thread_info
*thread
= (struct thread_info
*) entry
;
4758 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4765 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
4770 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
4774 if (thread
->last_resume_kind
== resume_stop
4775 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
4778 debug_printf (" client wants LWP to remain %ld stopped\n",
4783 if (lwp
->status_pending_p
)
4786 debug_printf (" LWP %ld has pending status, leaving stopped\n",
4791 gdb_assert (lwp
->suspended
>= 0);
4796 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
4800 if (thread
->last_resume_kind
== resume_stop
4801 && lwp
->pending_signals_to_report
== NULL
4802 && lwp
->collecting_fast_tracepoint
== 0)
4804 /* We haven't reported this LWP as stopped yet (otherwise, the
4805 last_status.kind check above would catch it, and we wouldn't
4806 reach here. This LWP may have been momentarily paused by a
4807 stop_all_lwps call while handling for example, another LWP's
4808 step-over. In that case, the pending expected SIGSTOP signal
4809 that was queued at vCont;t handling time will have already
4810 been consumed by wait_for_sigstop, and so we need to requeue
4811 another one here. Note that if the LWP already has a SIGSTOP
4812 pending, this is a no-op. */
4815 debug_printf ("Client wants LWP %ld to stop. "
4816 "Making sure it has a SIGSTOP pending\n",
4822 if (thread
->last_resume_kind
== resume_step
)
4825 debug_printf (" stepping LWP %ld, client wants it stepping\n",
4829 else if (lwp
->bp_reinsert
!= 0)
4832 debug_printf (" stepping LWP %ld, reinsert set\n",
4839 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4844 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4846 struct thread_info
*thread
= (struct thread_info
*) entry
;
4847 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4852 lwp_suspended_decr (lwp
);
4854 return proceed_one_lwp (entry
, except
);
4857 /* When we finish a step-over, set threads running again. If there's
4858 another thread that may need a step-over, now's the time to start
4859 it. Eventually, we'll move all threads past their breakpoints. */
4862 proceed_all_lwps (void)
4864 struct thread_info
*need_step_over
;
4866 /* If there is a thread which would otherwise be resumed, which is
4867 stopped at a breakpoint that needs stepping over, then don't
4868 resume any threads - have it step over the breakpoint with all
4869 other threads stopped, then resume all threads again. */
4871 if (supports_breakpoints ())
4874 = (struct thread_info
*) find_inferior (&all_threads
,
4875 need_step_over_p
, NULL
);
4877 if (need_step_over
!= NULL
)
4880 debug_printf ("proceed_all_lwps: found "
4881 "thread %ld needing a step-over\n",
4882 lwpid_of (need_step_over
));
4884 start_step_over (get_thread_lwp (need_step_over
));
4890 debug_printf ("Proceeding, no step-over needed\n");
4892 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
4895 /* Stopped LWPs that the client wanted to be running, that don't have
4896 pending statuses, are set to run again, except for EXCEPT, if not
4897 NULL. This undoes a stop_all_lwps call. */
4900 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
4906 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
4907 lwpid_of (get_lwp_thread (except
)));
4909 debug_printf ("unstopping all lwps\n");
4913 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
4915 find_inferior (&all_threads
, proceed_one_lwp
, except
);
4919 debug_printf ("unstop_all_lwps done\n");
4925 #ifdef HAVE_LINUX_REGSETS
4927 #define use_linux_regsets 1
4929 /* Returns true if REGSET has been disabled. */
4932 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
4934 return (info
->disabled_regsets
!= NULL
4935 && info
->disabled_regsets
[regset
- info
->regsets
]);
4938 /* Disable REGSET. */
4941 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
4945 dr_offset
= regset
- info
->regsets
;
4946 if (info
->disabled_regsets
== NULL
)
4947 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
4948 info
->disabled_regsets
[dr_offset
] = 1;
4952 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
4953 struct regcache
*regcache
)
4955 struct regset_info
*regset
;
4956 int saw_general_regs
= 0;
4960 pid
= lwpid_of (current_thread
);
4961 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4966 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4969 buf
= xmalloc (regset
->size
);
4971 nt_type
= regset
->nt_type
;
4975 iov
.iov_len
= regset
->size
;
4976 data
= (void *) &iov
;
4982 res
= ptrace (regset
->get_request
, pid
,
4983 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4985 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4991 /* If we get EIO on a regset, do not try it again for
4992 this process mode. */
4993 disable_regset (regsets_info
, regset
);
4995 else if (errno
== ENODATA
)
4997 /* ENODATA may be returned if the regset is currently
4998 not "active". This can happen in normal operation,
4999 so suppress the warning in this case. */
5004 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5011 if (regset
->type
== GENERAL_REGS
)
5012 saw_general_regs
= 1;
5013 regset
->store_function (regcache
, buf
);
5017 if (saw_general_regs
)
5024 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
5025 struct regcache
*regcache
)
5027 struct regset_info
*regset
;
5028 int saw_general_regs
= 0;
5032 pid
= lwpid_of (current_thread
);
5033 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
5038 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
5039 || regset
->fill_function
== NULL
)
5042 buf
= xmalloc (regset
->size
);
5044 /* First fill the buffer with the current register set contents,
5045 in case there are any items in the kernel's regset that are
5046 not in gdbserver's regcache. */
5048 nt_type
= regset
->nt_type
;
5052 iov
.iov_len
= regset
->size
;
5053 data
= (void *) &iov
;
5059 res
= ptrace (regset
->get_request
, pid
,
5060 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5062 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5067 /* Then overlay our cached registers on that. */
5068 regset
->fill_function (regcache
, buf
);
5070 /* Only now do we write the register set. */
5072 res
= ptrace (regset
->set_request
, pid
,
5073 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5075 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5083 /* If we get EIO on a regset, do not try it again for
5084 this process mode. */
5085 disable_regset (regsets_info
, regset
);
5087 else if (errno
== ESRCH
)
5089 /* At this point, ESRCH should mean the process is
5090 already gone, in which case we simply ignore attempts
5091 to change its registers. See also the related
5092 comment in linux_resume_one_lwp. */
5098 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5101 else if (regset
->type
== GENERAL_REGS
)
5102 saw_general_regs
= 1;
5105 if (saw_general_regs
)
5111 #else /* !HAVE_LINUX_REGSETS */
5113 #define use_linux_regsets 0
5114 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5115 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5119 /* Return 1 if register REGNO is supported by one of the regset ptrace
5120 calls or 0 if it has to be transferred individually. */
5123 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5125 unsigned char mask
= 1 << (regno
% 8);
5126 size_t index
= regno
/ 8;
5128 return (use_linux_regsets
5129 && (regs_info
->regset_bitmap
== NULL
5130 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5133 #ifdef HAVE_LINUX_USRREGS
5136 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5140 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5141 error ("Invalid register number %d.", regnum
);
5143 addr
= usrregs
->regmap
[regnum
];
5148 /* Fetch one register. */
5150 fetch_register (const struct usrregs_info
*usrregs
,
5151 struct regcache
*regcache
, int regno
)
5158 if (regno
>= usrregs
->num_regs
)
5160 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5163 regaddr
= register_addr (usrregs
, regno
);
5167 size
= ((register_size (regcache
->tdesc
, regno
)
5168 + sizeof (PTRACE_XFER_TYPE
) - 1)
5169 & -sizeof (PTRACE_XFER_TYPE
));
5170 buf
= (char *) alloca (size
);
5172 pid
= lwpid_of (current_thread
);
5173 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5176 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5177 ptrace (PTRACE_PEEKUSER
, pid
,
5178 /* Coerce to a uintptr_t first to avoid potential gcc warning
5179 of coercing an 8 byte integer to a 4 byte pointer. */
5180 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5181 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5183 error ("reading register %d: %s", regno
, strerror (errno
));
5186 if (the_low_target
.supply_ptrace_register
)
5187 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5189 supply_register (regcache
, regno
, buf
);
5192 /* Store one register. */
5194 store_register (const struct usrregs_info
*usrregs
,
5195 struct regcache
*regcache
, int regno
)
5202 if (regno
>= usrregs
->num_regs
)
5204 if ((*the_low_target
.cannot_store_register
) (regno
))
5207 regaddr
= register_addr (usrregs
, regno
);
5211 size
= ((register_size (regcache
->tdesc
, regno
)
5212 + sizeof (PTRACE_XFER_TYPE
) - 1)
5213 & -sizeof (PTRACE_XFER_TYPE
));
5214 buf
= (char *) alloca (size
);
5215 memset (buf
, 0, size
);
5217 if (the_low_target
.collect_ptrace_register
)
5218 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5220 collect_register (regcache
, regno
, buf
);
5222 pid
= lwpid_of (current_thread
);
5223 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5226 ptrace (PTRACE_POKEUSER
, pid
,
5227 /* Coerce to a uintptr_t first to avoid potential gcc warning
5228 about coercing an 8 byte integer to a 4 byte pointer. */
5229 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5230 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5233 /* At this point, ESRCH should mean the process is
5234 already gone, in which case we simply ignore attempts
5235 to change its registers. See also the related
5236 comment in linux_resume_one_lwp. */
5240 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5241 error ("writing register %d: %s", regno
, strerror (errno
));
5243 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5247 /* Fetch all registers, or just one, from the child process.
5248 If REGNO is -1, do this for all registers, skipping any that are
5249 assumed to have been retrieved by regsets_fetch_inferior_registers,
5250 unless ALL is non-zero.
5251 Otherwise, REGNO specifies which register (so we can save time). */
5253 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5254 struct regcache
*regcache
, int regno
, int all
)
5256 struct usrregs_info
*usr
= regs_info
->usrregs
;
5260 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5261 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5262 fetch_register (usr
, regcache
, regno
);
5265 fetch_register (usr
, regcache
, regno
);
5268 /* Store our register values back into the inferior.
5269 If REGNO is -1, do this for all registers, skipping any that are
5270 assumed to have been saved by regsets_store_inferior_registers,
5271 unless ALL is non-zero.
5272 Otherwise, REGNO specifies which register (so we can save time). */
5274 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5275 struct regcache
*regcache
, int regno
, int all
)
5277 struct usrregs_info
*usr
= regs_info
->usrregs
;
5281 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5282 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5283 store_register (usr
, regcache
, regno
);
5286 store_register (usr
, regcache
, regno
);
5289 #else /* !HAVE_LINUX_USRREGS */
5291 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5292 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5298 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5302 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5306 if (the_low_target
.fetch_register
!= NULL
5307 && regs_info
->usrregs
!= NULL
)
5308 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5309 (*the_low_target
.fetch_register
) (regcache
, regno
);
5311 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5312 if (regs_info
->usrregs
!= NULL
)
5313 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5317 if (the_low_target
.fetch_register
!= NULL
5318 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5321 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5323 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5325 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5326 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5331 linux_store_registers (struct regcache
*regcache
, int regno
)
5335 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5339 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5341 if (regs_info
->usrregs
!= NULL
)
5342 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5346 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5348 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5350 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5351 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5356 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5357 to debugger memory starting at MYADDR. */
5360 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5362 int pid
= lwpid_of (current_thread
);
5363 register PTRACE_XFER_TYPE
*buffer
;
5364 register CORE_ADDR addr
;
5371 /* Try using /proc. Don't bother for one word. */
5372 if (len
>= 3 * sizeof (long))
5376 /* We could keep this file open and cache it - possibly one per
5377 thread. That requires some juggling, but is even faster. */
5378 sprintf (filename
, "/proc/%d/mem", pid
);
5379 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5383 /* If pread64 is available, use it. It's faster if the kernel
5384 supports it (only one syscall), and it's 64-bit safe even on
5385 32-bit platforms (for instance, SPARC debugging a SPARC64
5388 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5391 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5392 bytes
= read (fd
, myaddr
, len
);
5399 /* Some data was read, we'll try to get the rest with ptrace. */
5409 /* Round starting address down to longword boundary. */
5410 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5411 /* Round ending address up; get number of longwords that makes. */
5412 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5413 / sizeof (PTRACE_XFER_TYPE
));
5414 /* Allocate buffer of that many longwords. */
5415 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5417 /* Read all the longwords */
5419 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5421 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5422 about coercing an 8 byte integer to a 4 byte pointer. */
5423 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5424 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5425 (PTRACE_TYPE_ARG4
) 0);
5431 /* Copy appropriate bytes out of the buffer. */
5434 i
*= sizeof (PTRACE_XFER_TYPE
);
5435 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5437 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5444 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5445 memory at MEMADDR. On failure (cannot write to the inferior)
5446 returns the value of errno. Always succeeds if LEN is zero. */
5449 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5452 /* Round starting address down to longword boundary. */
5453 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5454 /* Round ending address up; get number of longwords that makes. */
5456 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5457 / sizeof (PTRACE_XFER_TYPE
);
5459 /* Allocate buffer of that many longwords. */
5460 register PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5462 int pid
= lwpid_of (current_thread
);
5466 /* Zero length write always succeeds. */
5472 /* Dump up to four bytes. */
5473 char str
[4 * 2 + 1];
5475 int dump
= len
< 4 ? len
: 4;
5477 for (i
= 0; i
< dump
; i
++)
5479 sprintf (p
, "%02x", myaddr
[i
]);
5484 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5485 str
, (long) memaddr
, pid
);
5488 /* Fill start and end extra bytes of buffer with existing memory data. */
5491 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5492 about coercing an 8 byte integer to a 4 byte pointer. */
5493 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5494 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5495 (PTRACE_TYPE_ARG4
) 0);
5503 = ptrace (PTRACE_PEEKTEXT
, pid
,
5504 /* Coerce to a uintptr_t first to avoid potential gcc warning
5505 about coercing an 8 byte integer to a 4 byte pointer. */
5506 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5507 * sizeof (PTRACE_XFER_TYPE
)),
5508 (PTRACE_TYPE_ARG4
) 0);
5513 /* Copy data to be written over corresponding part of buffer. */
5515 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5518 /* Write the entire buffer. */
5520 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5523 ptrace (PTRACE_POKETEXT
, pid
,
5524 /* Coerce to a uintptr_t first to avoid potential gcc warning
5525 about coercing an 8 byte integer to a 4 byte pointer. */
5526 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5527 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5536 linux_look_up_symbols (void)
5538 #ifdef USE_THREAD_DB
5539 struct process_info
*proc
= current_process ();
5541 if (proc
->priv
->thread_db
!= NULL
)
5544 /* If the kernel supports tracing clones, then we don't need to
5545 use the magic thread event breakpoint to learn about
5547 thread_db_init (!linux_supports_traceclone ());
5552 linux_request_interrupt (void)
5554 extern unsigned long signal_pid
;
5556 /* Send a SIGINT to the process group. This acts just like the user
5557 typed a ^C on the controlling terminal. */
5558 kill (-signal_pid
, SIGINT
);
5561 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5562 to debugger memory starting at MYADDR. */
5565 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5567 char filename
[PATH_MAX
];
5569 int pid
= lwpid_of (current_thread
);
5571 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5573 fd
= open (filename
, O_RDONLY
);
5577 if (offset
!= (CORE_ADDR
) 0
5578 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5581 n
= read (fd
, myaddr
, len
);
5588 /* These breakpoint and watchpoint related wrapper functions simply
5589 pass on the function call if the target has registered a
5590 corresponding function. */
5593 linux_supports_z_point_type (char z_type
)
5595 return (the_low_target
.supports_z_point_type
!= NULL
5596 && the_low_target
.supports_z_point_type (z_type
));
5600 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5601 int size
, struct raw_breakpoint
*bp
)
5603 if (type
== raw_bkpt_type_sw
)
5604 return insert_memory_breakpoint (bp
);
5605 else if (the_low_target
.insert_point
!= NULL
)
5606 return the_low_target
.insert_point (type
, addr
, size
, bp
);
5608 /* Unsupported (see target.h). */
5613 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5614 int size
, struct raw_breakpoint
*bp
)
5616 if (type
== raw_bkpt_type_sw
)
5617 return remove_memory_breakpoint (bp
);
5618 else if (the_low_target
.remove_point
!= NULL
)
5619 return the_low_target
.remove_point (type
, addr
, size
, bp
);
5621 /* Unsupported (see target.h). */
5625 /* Implement the to_stopped_by_sw_breakpoint target_ops
5629 linux_stopped_by_sw_breakpoint (void)
5631 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5633 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
5636 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
5640 linux_supports_stopped_by_sw_breakpoint (void)
5642 return USE_SIGTRAP_SIGINFO
;
5645 /* Implement the to_stopped_by_hw_breakpoint target_ops
5649 linux_stopped_by_hw_breakpoint (void)
5651 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5653 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
5656 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
5660 linux_supports_stopped_by_hw_breakpoint (void)
5662 return USE_SIGTRAP_SIGINFO
;
5665 /* Implement the supports_hardware_single_step target_ops method. */
5668 linux_supports_hardware_single_step (void)
5670 return can_hardware_single_step ();
5674 linux_stopped_by_watchpoint (void)
5676 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5678 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
5682 linux_stopped_data_address (void)
5684 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5686 return lwp
->stopped_data_address
;
5689 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
5690 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
5691 && defined(PT_TEXT_END_ADDR)
5693 /* This is only used for targets that define PT_TEXT_ADDR,
5694 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
5695 the target has different ways of acquiring this information, like
5698 /* Under uClinux, programs are loaded at non-zero offsets, which we need
5699 to tell gdb about. */
5702 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
5704 unsigned long text
, text_end
, data
;
5705 int pid
= lwpid_of (current_thread
);
5709 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
5710 (PTRACE_TYPE_ARG4
) 0);
5711 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
5712 (PTRACE_TYPE_ARG4
) 0);
5713 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
5714 (PTRACE_TYPE_ARG4
) 0);
5718 /* Both text and data offsets produced at compile-time (and so
5719 used by gdb) are relative to the beginning of the program,
5720 with the data segment immediately following the text segment.
5721 However, the actual runtime layout in memory may put the data
5722 somewhere else, so when we send gdb a data base-address, we
5723 use the real data base address and subtract the compile-time
5724 data base-address from it (which is just the length of the
5725 text segment). BSS immediately follows data in both
5728 *data_p
= data
- (text_end
- text
);
5737 linux_qxfer_osdata (const char *annex
,
5738 unsigned char *readbuf
, unsigned const char *writebuf
,
5739 CORE_ADDR offset
, int len
)
5741 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
5744 /* Convert a native/host siginfo object, into/from the siginfo in the
5745 layout of the inferiors' architecture. */
5748 siginfo_fixup (siginfo_t
*siginfo
, void *inf_siginfo
, int direction
)
5752 if (the_low_target
.siginfo_fixup
!= NULL
)
5753 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
5755 /* If there was no callback, or the callback didn't do anything,
5756 then just do a straight memcpy. */
5760 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
5762 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
5767 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
5768 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
5772 char inf_siginfo
[sizeof (siginfo_t
)];
5774 if (current_thread
== NULL
)
5777 pid
= lwpid_of (current_thread
);
5780 debug_printf ("%s siginfo for lwp %d.\n",
5781 readbuf
!= NULL
? "Reading" : "Writing",
5784 if (offset
>= sizeof (siginfo
))
5787 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5790 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
5791 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
5792 inferior with a 64-bit GDBSERVER should look the same as debugging it
5793 with a 32-bit GDBSERVER, we need to convert it. */
5794 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
5796 if (offset
+ len
> sizeof (siginfo
))
5797 len
= sizeof (siginfo
) - offset
;
5799 if (readbuf
!= NULL
)
5800 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
5803 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
5805 /* Convert back to ptrace layout before flushing it out. */
5806 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
5808 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5815 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5816 so we notice when children change state; as the handler for the
5817 sigsuspend in my_waitpid. */
5820 sigchld_handler (int signo
)
5822 int old_errno
= errno
;
5828 /* fprintf is not async-signal-safe, so call write
5830 if (write (2, "sigchld_handler\n",
5831 sizeof ("sigchld_handler\n") - 1) < 0)
5832 break; /* just ignore */
5836 if (target_is_async_p ())
5837 async_file_mark (); /* trigger a linux_wait */
5843 linux_supports_non_stop (void)
5849 linux_async (int enable
)
5851 int previous
= target_is_async_p ();
5854 debug_printf ("linux_async (%d), previous=%d\n",
5857 if (previous
!= enable
)
5860 sigemptyset (&mask
);
5861 sigaddset (&mask
, SIGCHLD
);
5863 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
5867 if (pipe (linux_event_pipe
) == -1)
5869 linux_event_pipe
[0] = -1;
5870 linux_event_pipe
[1] = -1;
5871 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5873 warning ("creating event pipe failed.");
5877 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5878 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5880 /* Register the event loop handler. */
5881 add_file_handler (linux_event_pipe
[0],
5882 handle_target_event
, NULL
);
5884 /* Always trigger a linux_wait. */
5889 delete_file_handler (linux_event_pipe
[0]);
5891 close (linux_event_pipe
[0]);
5892 close (linux_event_pipe
[1]);
5893 linux_event_pipe
[0] = -1;
5894 linux_event_pipe
[1] = -1;
5897 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5904 linux_start_non_stop (int nonstop
)
5906 /* Register or unregister from event-loop accordingly. */
5907 linux_async (nonstop
);
5909 if (target_is_async_p () != (nonstop
!= 0))
5916 linux_supports_multi_process (void)
5921 /* Check if fork events are supported. */
5924 linux_supports_fork_events (void)
5926 return linux_supports_tracefork ();
5929 /* Check if vfork events are supported. */
5932 linux_supports_vfork_events (void)
5934 return linux_supports_tracefork ();
5937 /* Check if exec events are supported. */
5940 linux_supports_exec_events (void)
5942 return linux_supports_traceexec ();
5945 /* Callback for 'find_inferior'. Set the (possibly changed) ptrace
5946 options for the specified lwp. */
5949 reset_lwp_ptrace_options_callback (struct inferior_list_entry
*entry
,
5952 struct thread_info
*thread
= (struct thread_info
*) entry
;
5953 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5957 /* Stop the lwp so we can modify its ptrace options. */
5958 lwp
->must_set_ptrace_flags
= 1;
5959 linux_stop_lwp (lwp
);
5963 /* Already stopped; go ahead and set the ptrace options. */
5964 struct process_info
*proc
= find_process_pid (pid_of (thread
));
5965 int options
= linux_low_ptrace_options (proc
->attached
);
5967 linux_enable_event_reporting (lwpid_of (thread
), options
);
5968 lwp
->must_set_ptrace_flags
= 0;
5974 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
5975 ptrace flags for all inferiors. This is in case the new GDB connection
5976 doesn't support the same set of events that the previous one did. */
5979 linux_handle_new_gdb_connection (void)
5983 /* Request that all the lwps reset their ptrace options. */
5984 find_inferior (&all_threads
, reset_lwp_ptrace_options_callback
, &pid
);
5988 linux_supports_disable_randomization (void)
5990 #ifdef HAVE_PERSONALITY
5998 linux_supports_agent (void)
6004 linux_supports_range_stepping (void)
6006 if (*the_low_target
.supports_range_stepping
== NULL
)
6009 return (*the_low_target
.supports_range_stepping
) ();
6012 /* Enumerate spufs IDs for process PID. */
6014 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
6020 struct dirent
*entry
;
6022 sprintf (path
, "/proc/%ld/fd", pid
);
6023 dir
= opendir (path
);
6028 while ((entry
= readdir (dir
)) != NULL
)
6034 fd
= atoi (entry
->d_name
);
6038 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
6039 if (stat (path
, &st
) != 0)
6041 if (!S_ISDIR (st
.st_mode
))
6044 if (statfs (path
, &stfs
) != 0)
6046 if (stfs
.f_type
!= SPUFS_MAGIC
)
6049 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6051 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6061 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6062 object type, using the /proc file system. */
6064 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6065 unsigned const char *writebuf
,
6066 CORE_ADDR offset
, int len
)
6068 long pid
= lwpid_of (current_thread
);
6073 if (!writebuf
&& !readbuf
)
6081 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6084 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6085 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6090 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6097 ret
= write (fd
, writebuf
, (size_t) len
);
6099 ret
= read (fd
, readbuf
, (size_t) len
);
6105 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6106 struct target_loadseg
6108 /* Core address to which the segment is mapped. */
6110 /* VMA recorded in the program header. */
6112 /* Size of this segment in memory. */
6116 # if defined PT_GETDSBT
6117 struct target_loadmap
6119 /* Protocol version number, must be zero. */
6121 /* Pointer to the DSBT table, its size, and the DSBT index. */
6122 unsigned *dsbt_table
;
6123 unsigned dsbt_size
, dsbt_index
;
6124 /* Number of segments in this map. */
6126 /* The actual memory map. */
6127 struct target_loadseg segs
[/*nsegs*/];
6129 # define LINUX_LOADMAP PT_GETDSBT
6130 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6131 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6133 struct target_loadmap
6135 /* Protocol version number, must be zero. */
6137 /* Number of segments in this map. */
6139 /* The actual memory map. */
6140 struct target_loadseg segs
[/*nsegs*/];
6142 # define LINUX_LOADMAP PTRACE_GETFDPIC
6143 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6144 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6148 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6149 unsigned char *myaddr
, unsigned int len
)
6151 int pid
= lwpid_of (current_thread
);
6153 struct target_loadmap
*data
= NULL
;
6154 unsigned int actual_length
, copy_length
;
6156 if (strcmp (annex
, "exec") == 0)
6157 addr
= (int) LINUX_LOADMAP_EXEC
;
6158 else if (strcmp (annex
, "interp") == 0)
6159 addr
= (int) LINUX_LOADMAP_INTERP
;
6163 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6169 actual_length
= sizeof (struct target_loadmap
)
6170 + sizeof (struct target_loadseg
) * data
->nsegs
;
6172 if (offset
< 0 || offset
> actual_length
)
6175 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6176 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6180 # define linux_read_loadmap NULL
6181 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6184 linux_process_qsupported (char **features
, int count
)
6186 if (the_low_target
.process_qsupported
!= NULL
)
6187 the_low_target
.process_qsupported (features
, count
);
6191 linux_supports_tracepoints (void)
6193 if (*the_low_target
.supports_tracepoints
== NULL
)
6196 return (*the_low_target
.supports_tracepoints
) ();
6200 linux_read_pc (struct regcache
*regcache
)
6202 if (the_low_target
.get_pc
== NULL
)
6205 return (*the_low_target
.get_pc
) (regcache
);
6209 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6211 gdb_assert (the_low_target
.set_pc
!= NULL
);
6213 (*the_low_target
.set_pc
) (regcache
, pc
);
6217 linux_thread_stopped (struct thread_info
*thread
)
6219 return get_thread_lwp (thread
)->stopped
;
6222 /* This exposes stop-all-threads functionality to other modules. */
6225 linux_pause_all (int freeze
)
6227 stop_all_lwps (freeze
, NULL
);
6230 /* This exposes unstop-all-threads functionality to other gdbserver
6234 linux_unpause_all (int unfreeze
)
6236 unstop_all_lwps (unfreeze
, NULL
);
6240 linux_prepare_to_access_memory (void)
6242 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6245 linux_pause_all (1);
6250 linux_done_accessing_memory (void)
6252 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6255 linux_unpause_all (1);
6259 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6260 CORE_ADDR collector
,
6263 CORE_ADDR
*jump_entry
,
6264 CORE_ADDR
*trampoline
,
6265 ULONGEST
*trampoline_size
,
6266 unsigned char *jjump_pad_insn
,
6267 ULONGEST
*jjump_pad_insn_size
,
6268 CORE_ADDR
*adjusted_insn_addr
,
6269 CORE_ADDR
*adjusted_insn_addr_end
,
6272 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6273 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6274 jump_entry
, trampoline
, trampoline_size
,
6275 jjump_pad_insn
, jjump_pad_insn_size
,
6276 adjusted_insn_addr
, adjusted_insn_addr_end
,
6280 static struct emit_ops
*
6281 linux_emit_ops (void)
6283 if (the_low_target
.emit_ops
!= NULL
)
6284 return (*the_low_target
.emit_ops
) ();
6290 linux_get_min_fast_tracepoint_insn_len (void)
6292 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6295 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6298 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6299 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6301 char filename
[PATH_MAX
];
6303 const int auxv_size
= is_elf64
6304 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6305 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6307 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6309 fd
= open (filename
, O_RDONLY
);
6315 while (read (fd
, buf
, auxv_size
) == auxv_size
6316 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6320 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6322 switch (aux
->a_type
)
6325 *phdr_memaddr
= aux
->a_un
.a_val
;
6328 *num_phdr
= aux
->a_un
.a_val
;
6334 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6336 switch (aux
->a_type
)
6339 *phdr_memaddr
= aux
->a_un
.a_val
;
6342 *num_phdr
= aux
->a_un
.a_val
;
6350 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6352 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6353 "phdr_memaddr = %ld, phdr_num = %d",
6354 (long) *phdr_memaddr
, *num_phdr
);
6361 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6364 get_dynamic (const int pid
, const int is_elf64
)
6366 CORE_ADDR phdr_memaddr
, relocation
;
6368 unsigned char *phdr_buf
;
6369 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6371 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6374 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6375 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6377 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6380 /* Compute relocation: it is expected to be 0 for "regular" executables,
6381 non-zero for PIE ones. */
6383 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6386 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6388 if (p
->p_type
== PT_PHDR
)
6389 relocation
= phdr_memaddr
- p
->p_vaddr
;
6393 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6395 if (p
->p_type
== PT_PHDR
)
6396 relocation
= phdr_memaddr
- p
->p_vaddr
;
6399 if (relocation
== -1)
6401 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6402 any real world executables, including PIE executables, have always
6403 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6404 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6405 or present DT_DEBUG anyway (fpc binaries are statically linked).
6407 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6409 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6414 for (i
= 0; i
< num_phdr
; i
++)
6418 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6420 if (p
->p_type
== PT_DYNAMIC
)
6421 return p
->p_vaddr
+ relocation
;
6425 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6427 if (p
->p_type
== PT_DYNAMIC
)
6428 return p
->p_vaddr
+ relocation
;
6435 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6436 can be 0 if the inferior does not yet have the library list initialized.
6437 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6438 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6441 get_r_debug (const int pid
, const int is_elf64
)
6443 CORE_ADDR dynamic_memaddr
;
6444 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6445 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6448 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6449 if (dynamic_memaddr
== 0)
6452 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6456 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6457 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6461 unsigned char buf
[sizeof (Elf64_Xword
)];
6465 #ifdef DT_MIPS_RLD_MAP
6466 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6468 if (linux_read_memory (dyn
->d_un
.d_val
,
6469 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6474 #endif /* DT_MIPS_RLD_MAP */
6475 #ifdef DT_MIPS_RLD_MAP_REL
6476 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6478 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6479 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6484 #endif /* DT_MIPS_RLD_MAP_REL */
6486 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6487 map
= dyn
->d_un
.d_val
;
6489 if (dyn
->d_tag
== DT_NULL
)
6494 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6495 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6499 unsigned char buf
[sizeof (Elf32_Word
)];
6503 #ifdef DT_MIPS_RLD_MAP
6504 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6506 if (linux_read_memory (dyn
->d_un
.d_val
,
6507 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6512 #endif /* DT_MIPS_RLD_MAP */
6513 #ifdef DT_MIPS_RLD_MAP_REL
6514 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6516 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6517 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6522 #endif /* DT_MIPS_RLD_MAP_REL */
6524 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6525 map
= dyn
->d_un
.d_val
;
6527 if (dyn
->d_tag
== DT_NULL
)
6531 dynamic_memaddr
+= dyn_size
;
6537 /* Read one pointer from MEMADDR in the inferior. */
6540 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6544 /* Go through a union so this works on either big or little endian
6545 hosts, when the inferior's pointer size is smaller than the size
6546 of CORE_ADDR. It is assumed the inferior's endianness is the
6547 same of the superior's. */
6550 CORE_ADDR core_addr
;
6555 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6558 if (ptr_size
== sizeof (CORE_ADDR
))
6559 *ptr
= addr
.core_addr
;
6560 else if (ptr_size
== sizeof (unsigned int))
6563 gdb_assert_not_reached ("unhandled pointer size");
6568 struct link_map_offsets
6570 /* Offset and size of r_debug.r_version. */
6571 int r_version_offset
;
6573 /* Offset and size of r_debug.r_map. */
6576 /* Offset to l_addr field in struct link_map. */
6579 /* Offset to l_name field in struct link_map. */
6582 /* Offset to l_ld field in struct link_map. */
6585 /* Offset to l_next field in struct link_map. */
6588 /* Offset to l_prev field in struct link_map. */
6592 /* Construct qXfer:libraries-svr4:read reply. */
6595 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
6596 unsigned const char *writebuf
,
6597 CORE_ADDR offset
, int len
)
6600 unsigned document_len
;
6601 struct process_info_private
*const priv
= current_process ()->priv
;
6602 char filename
[PATH_MAX
];
6605 static const struct link_map_offsets lmo_32bit_offsets
=
6607 0, /* r_version offset. */
6608 4, /* r_debug.r_map offset. */
6609 0, /* l_addr offset in link_map. */
6610 4, /* l_name offset in link_map. */
6611 8, /* l_ld offset in link_map. */
6612 12, /* l_next offset in link_map. */
6613 16 /* l_prev offset in link_map. */
6616 static const struct link_map_offsets lmo_64bit_offsets
=
6618 0, /* r_version offset. */
6619 8, /* r_debug.r_map offset. */
6620 0, /* l_addr offset in link_map. */
6621 8, /* l_name offset in link_map. */
6622 16, /* l_ld offset in link_map. */
6623 24, /* l_next offset in link_map. */
6624 32 /* l_prev offset in link_map. */
6626 const struct link_map_offsets
*lmo
;
6627 unsigned int machine
;
6629 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
6630 int allocated
= 1024;
6632 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
6633 int header_done
= 0;
6635 if (writebuf
!= NULL
)
6637 if (readbuf
== NULL
)
6640 pid
= lwpid_of (current_thread
);
6641 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
6642 is_elf64
= elf_64_file_p (filename
, &machine
);
6643 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
6644 ptr_size
= is_elf64
? 8 : 4;
6646 while (annex
[0] != '\0')
6652 sep
= strchr (annex
, '=');
6657 if (len
== 5 && startswith (annex
, "start"))
6659 else if (len
== 4 && startswith (annex
, "prev"))
6663 annex
= strchr (sep
, ';');
6670 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
6677 if (priv
->r_debug
== 0)
6678 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
6680 /* We failed to find DT_DEBUG. Such situation will not change
6681 for this inferior - do not retry it. Report it to GDB as
6682 E01, see for the reasons at the GDB solib-svr4.c side. */
6683 if (priv
->r_debug
== (CORE_ADDR
) -1)
6686 if (priv
->r_debug
!= 0)
6688 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
6689 (unsigned char *) &r_version
,
6690 sizeof (r_version
)) != 0
6693 warning ("unexpected r_debug version %d", r_version
);
6695 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
6696 &lm_addr
, ptr_size
) != 0)
6698 warning ("unable to read r_map from 0x%lx",
6699 (long) priv
->r_debug
+ lmo
->r_map_offset
);
6704 document
= (char *) xmalloc (allocated
);
6705 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
6706 p
= document
+ strlen (document
);
6709 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
6710 &l_name
, ptr_size
) == 0
6711 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
6712 &l_addr
, ptr_size
) == 0
6713 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
6714 &l_ld
, ptr_size
) == 0
6715 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
6716 &l_prev
, ptr_size
) == 0
6717 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
6718 &l_next
, ptr_size
) == 0)
6720 unsigned char libname
[PATH_MAX
];
6722 if (lm_prev
!= l_prev
)
6724 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
6725 (long) lm_prev
, (long) l_prev
);
6729 /* Ignore the first entry even if it has valid name as the first entry
6730 corresponds to the main executable. The first entry should not be
6731 skipped if the dynamic loader was loaded late by a static executable
6732 (see solib-svr4.c parameter ignore_first). But in such case the main
6733 executable does not have PT_DYNAMIC present and this function already
6734 exited above due to failed get_r_debug. */
6737 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
6742 /* Not checking for error because reading may stop before
6743 we've got PATH_MAX worth of characters. */
6745 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
6746 libname
[sizeof (libname
) - 1] = '\0';
6747 if (libname
[0] != '\0')
6749 /* 6x the size for xml_escape_text below. */
6750 size_t len
= 6 * strlen ((char *) libname
);
6755 /* Terminate `<library-list-svr4'. */
6760 while (allocated
< p
- document
+ len
+ 200)
6762 /* Expand to guarantee sufficient storage. */
6763 uintptr_t document_len
= p
- document
;
6765 document
= (char *) xrealloc (document
, 2 * allocated
);
6767 p
= document
+ document_len
;
6770 name
= xml_escape_text ((char *) libname
);
6771 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
6772 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
6773 name
, (unsigned long) lm_addr
,
6774 (unsigned long) l_addr
, (unsigned long) l_ld
);
6785 /* Empty list; terminate `<library-list-svr4'. */
6789 strcpy (p
, "</library-list-svr4>");
6791 document_len
= strlen (document
);
6792 if (offset
< document_len
)
6793 document_len
-= offset
;
6796 if (len
> document_len
)
6799 memcpy (readbuf
, document
+ offset
, len
);
6805 #ifdef HAVE_LINUX_BTRACE
6807 /* See to_disable_btrace target method. */
6810 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
6812 enum btrace_error err
;
6814 err
= linux_disable_btrace (tinfo
);
6815 return (err
== BTRACE_ERR_NONE
? 0 : -1);
6818 /* Encode an Intel(R) Processor Trace configuration. */
6821 linux_low_encode_pt_config (struct buffer
*buffer
,
6822 const struct btrace_data_pt_config
*config
)
6824 buffer_grow_str (buffer
, "<pt-config>\n");
6826 switch (config
->cpu
.vendor
)
6829 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
6830 "model=\"%u\" stepping=\"%u\"/>\n",
6831 config
->cpu
.family
, config
->cpu
.model
,
6832 config
->cpu
.stepping
);
6839 buffer_grow_str (buffer
, "</pt-config>\n");
6842 /* Encode a raw buffer. */
6845 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
6851 /* We use hex encoding - see common/rsp-low.h. */
6852 buffer_grow_str (buffer
, "<raw>\n");
6858 elem
[0] = tohex ((*data
>> 4) & 0xf);
6859 elem
[1] = tohex (*data
++ & 0xf);
6861 buffer_grow (buffer
, elem
, 2);
6864 buffer_grow_str (buffer
, "</raw>\n");
6867 /* See to_read_btrace target method. */
6870 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
6871 enum btrace_read_type type
)
6873 struct btrace_data btrace
;
6874 struct btrace_block
*block
;
6875 enum btrace_error err
;
6878 btrace_data_init (&btrace
);
6880 err
= linux_read_btrace (&btrace
, tinfo
, type
);
6881 if (err
!= BTRACE_ERR_NONE
)
6883 if (err
== BTRACE_ERR_OVERFLOW
)
6884 buffer_grow_str0 (buffer
, "E.Overflow.");
6886 buffer_grow_str0 (buffer
, "E.Generic Error.");
6891 switch (btrace
.format
)
6893 case BTRACE_FORMAT_NONE
:
6894 buffer_grow_str0 (buffer
, "E.No Trace.");
6897 case BTRACE_FORMAT_BTS
:
6898 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
6899 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
6902 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
6904 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
6905 paddress (block
->begin
), paddress (block
->end
));
6907 buffer_grow_str0 (buffer
, "</btrace>\n");
6910 case BTRACE_FORMAT_PT
:
6911 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
6912 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
6913 buffer_grow_str (buffer
, "<pt>\n");
6915 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
6917 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
6918 btrace
.variant
.pt
.size
);
6920 buffer_grow_str (buffer
, "</pt>\n");
6921 buffer_grow_str0 (buffer
, "</btrace>\n");
6925 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
6929 btrace_data_fini (&btrace
);
6933 btrace_data_fini (&btrace
);
6937 /* See to_btrace_conf target method. */
6940 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
6941 struct buffer
*buffer
)
6943 const struct btrace_config
*conf
;
6945 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
6946 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
6948 conf
= linux_btrace_conf (tinfo
);
6951 switch (conf
->format
)
6953 case BTRACE_FORMAT_NONE
:
6956 case BTRACE_FORMAT_BTS
:
6957 buffer_xml_printf (buffer
, "<bts");
6958 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
6959 buffer_xml_printf (buffer
, " />\n");
6962 case BTRACE_FORMAT_PT
:
6963 buffer_xml_printf (buffer
, "<pt");
6964 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
6965 buffer_xml_printf (buffer
, "/>\n");
6970 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
6973 #endif /* HAVE_LINUX_BTRACE */
6975 /* See nat/linux-nat.h. */
6978 current_lwp_ptid (void)
6980 return ptid_of (current_thread
);
6983 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
6986 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
6988 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
6989 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
6991 return default_breakpoint_kind_from_pc (pcptr
);
6994 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
6996 static const gdb_byte
*
6997 linux_sw_breakpoint_from_kind (int kind
, int *size
)
6999 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
7001 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
7004 static struct target_ops linux_target_ops
= {
7005 linux_create_inferior
,
7015 linux_fetch_registers
,
7016 linux_store_registers
,
7017 linux_prepare_to_access_memory
,
7018 linux_done_accessing_memory
,
7021 linux_look_up_symbols
,
7022 linux_request_interrupt
,
7024 linux_supports_z_point_type
,
7027 linux_stopped_by_sw_breakpoint
,
7028 linux_supports_stopped_by_sw_breakpoint
,
7029 linux_stopped_by_hw_breakpoint
,
7030 linux_supports_stopped_by_hw_breakpoint
,
7031 linux_supports_hardware_single_step
,
7032 linux_stopped_by_watchpoint
,
7033 linux_stopped_data_address
,
7034 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7035 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7036 && defined(PT_TEXT_END_ADDR)
7041 #ifdef USE_THREAD_DB
7042 thread_db_get_tls_address
,
7047 hostio_last_error_from_errno
,
7050 linux_supports_non_stop
,
7052 linux_start_non_stop
,
7053 linux_supports_multi_process
,
7054 linux_supports_fork_events
,
7055 linux_supports_vfork_events
,
7056 linux_supports_exec_events
,
7057 linux_handle_new_gdb_connection
,
7058 #ifdef USE_THREAD_DB
7059 thread_db_handle_monitor_command
,
7063 linux_common_core_of_thread
,
7065 linux_process_qsupported
,
7066 linux_supports_tracepoints
,
7069 linux_thread_stopped
,
7073 linux_stabilize_threads
,
7074 linux_install_fast_tracepoint_jump_pad
,
7076 linux_supports_disable_randomization
,
7077 linux_get_min_fast_tracepoint_insn_len
,
7078 linux_qxfer_libraries_svr4
,
7079 linux_supports_agent
,
7080 #ifdef HAVE_LINUX_BTRACE
7081 linux_supports_btrace
,
7082 linux_enable_btrace
,
7083 linux_low_disable_btrace
,
7084 linux_low_read_btrace
,
7085 linux_low_btrace_conf
,
7093 linux_supports_range_stepping
,
7094 linux_proc_pid_to_exec_file
,
7095 linux_mntns_open_cloexec
,
7097 linux_mntns_readlink
,
7098 linux_breakpoint_kind_from_pc
,
7099 linux_sw_breakpoint_from_kind
,
7100 linux_proc_tid_get_name
,
7104 linux_init_signals ()
7106 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
7107 to find what the cancel signal actually is. */
7108 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
7109 signal (__SIGRTMIN
+1, SIG_IGN
);
7113 #ifdef HAVE_LINUX_REGSETS
7115 initialize_regsets_info (struct regsets_info
*info
)
7117 for (info
->num_regsets
= 0;
7118 info
->regsets
[info
->num_regsets
].size
>= 0;
7119 info
->num_regsets
++)
7125 initialize_low (void)
7127 struct sigaction sigchld_action
;
7129 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7130 set_target_ops (&linux_target_ops
);
7132 linux_init_signals ();
7133 linux_ptrace_init_warnings ();
7135 sigchld_action
.sa_handler
= sigchld_handler
;
7136 sigemptyset (&sigchld_action
.sa_mask
);
7137 sigchld_action
.sa_flags
= SA_RESTART
;
7138 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7140 initialize_low_arch ();
7142 linux_check_ptrace_features ();