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 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
451 || (event
== PTRACE_EVENT_CLONE
))
454 unsigned long new_pid
;
457 /* Get the pid of the new lwp. */
458 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
461 /* If we haven't already seen the new PID stop, wait for it now. */
462 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
464 /* The new child has a pending SIGSTOP. We can't affect it until it
465 hits the SIGSTOP, but we're already attached. */
467 ret
= my_waitpid (new_pid
, &status
, __WALL
);
470 perror_with_name ("waiting for new child");
471 else if (ret
!= new_pid
)
472 warning ("wait returned unexpected PID %d", ret
);
473 else if (!WIFSTOPPED (status
))
474 warning ("wait returned unexpected status 0x%x", status
);
477 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
479 struct process_info
*parent_proc
;
480 struct process_info
*child_proc
;
481 struct lwp_info
*child_lwp
;
482 struct thread_info
*child_thr
;
483 struct target_desc
*tdesc
;
485 ptid
= ptid_build (new_pid
, new_pid
, 0);
489 debug_printf ("HEW: Got fork event from LWP %ld, "
491 ptid_get_lwp (ptid_of (event_thr
)),
492 ptid_get_pid (ptid
));
495 /* Add the new process to the tables and clone the breakpoint
496 lists of the parent. We need to do this even if the new process
497 will be detached, since we will need the process object and the
498 breakpoints to remove any breakpoints from memory when we
499 detach, and the client side will access registers. */
500 child_proc
= linux_add_process (new_pid
, 0);
501 gdb_assert (child_proc
!= NULL
);
502 child_lwp
= add_lwp (ptid
);
503 gdb_assert (child_lwp
!= NULL
);
504 child_lwp
->stopped
= 1;
505 child_lwp
->must_set_ptrace_flags
= 1;
506 child_lwp
->status_pending_p
= 0;
507 child_thr
= get_lwp_thread (child_lwp
);
508 child_thr
->last_resume_kind
= resume_stop
;
509 child_thr
->last_status
.kind
= TARGET_WAITKIND_STOPPED
;
511 /* If we're suspending all threads, leave this one suspended
513 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
)
516 debug_printf ("HEW: leaving child suspended\n");
517 child_lwp
->suspended
= 1;
520 parent_proc
= get_thread_process (event_thr
);
521 child_proc
->attached
= parent_proc
->attached
;
522 clone_all_breakpoints (&child_proc
->breakpoints
,
523 &child_proc
->raw_breakpoints
,
524 parent_proc
->breakpoints
);
526 tdesc
= XNEW (struct target_desc
);
527 copy_target_description (tdesc
, parent_proc
->tdesc
);
528 child_proc
->tdesc
= tdesc
;
530 /* Clone arch-specific process data. */
531 if (the_low_target
.new_fork
!= NULL
)
532 the_low_target
.new_fork (parent_proc
, child_proc
);
534 /* Save fork info in the parent thread. */
535 if (event
== PTRACE_EVENT_FORK
)
536 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
537 else if (event
== PTRACE_EVENT_VFORK
)
538 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
540 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
542 /* The status_pending field contains bits denoting the
543 extended event, so when the pending event is handled,
544 the handler will look at lwp->waitstatus. */
545 event_lwp
->status_pending_p
= 1;
546 event_lwp
->status_pending
= wstat
;
548 /* Report the event. */
553 debug_printf ("HEW: Got clone event "
554 "from LWP %ld, new child is LWP %ld\n",
555 lwpid_of (event_thr
), new_pid
);
557 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
558 new_lwp
= add_lwp (ptid
);
560 /* Either we're going to immediately resume the new thread
561 or leave it stopped. linux_resume_one_lwp is a nop if it
562 thinks the thread is currently running, so set this first
563 before calling linux_resume_one_lwp. */
564 new_lwp
->stopped
= 1;
566 /* If we're suspending all threads, leave this one suspended
568 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
)
569 new_lwp
->suspended
= 1;
571 /* Normally we will get the pending SIGSTOP. But in some cases
572 we might get another signal delivered to the group first.
573 If we do get another signal, be sure not to lose it. */
574 if (WSTOPSIG (status
) != SIGSTOP
)
576 new_lwp
->stop_expected
= 1;
577 new_lwp
->status_pending_p
= 1;
578 new_lwp
->status_pending
= status
;
581 /* Don't report the event. */
584 else if (event
== PTRACE_EVENT_VFORK_DONE
)
586 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
588 /* Report the event. */
591 else if (event
== PTRACE_EVENT_EXEC
&& report_exec_events
)
593 struct process_info
*proc
;
599 debug_printf ("HEW: Got exec event from LWP %ld\n",
600 lwpid_of (event_thr
));
603 /* Get the event ptid. */
604 event_ptid
= ptid_of (event_thr
);
605 event_pid
= ptid_get_pid (event_ptid
);
607 /* Delete the execing process and all its threads. */
608 proc
= get_thread_process (event_thr
);
610 current_thread
= NULL
;
612 /* Create a new process/lwp/thread. */
613 proc
= linux_add_process (event_pid
, 0);
614 event_lwp
= add_lwp (event_ptid
);
615 event_thr
= get_lwp_thread (event_lwp
);
616 gdb_assert (current_thread
== event_thr
);
617 linux_arch_setup_thread (event_thr
);
619 /* Set the event status. */
620 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
621 event_lwp
->waitstatus
.value
.execd_pathname
622 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
624 /* Mark the exec status as pending. */
625 event_lwp
->stopped
= 1;
626 event_lwp
->status_pending_p
= 1;
627 event_lwp
->status_pending
= wstat
;
628 event_thr
->last_resume_kind
= resume_continue
;
629 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
631 /* Report the event. */
632 *orig_event_lwp
= event_lwp
;
636 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
639 /* Return the PC as read from the regcache of LWP, without any
643 get_pc (struct lwp_info
*lwp
)
645 struct thread_info
*saved_thread
;
646 struct regcache
*regcache
;
649 if (the_low_target
.get_pc
== NULL
)
652 saved_thread
= current_thread
;
653 current_thread
= get_lwp_thread (lwp
);
655 regcache
= get_thread_regcache (current_thread
, 1);
656 pc
= (*the_low_target
.get_pc
) (regcache
);
659 debug_printf ("pc is 0x%lx\n", (long) pc
);
661 current_thread
= saved_thread
;
665 /* This function should only be called if LWP got a SIGTRAP.
666 The SIGTRAP could mean several things.
668 On i386, where decr_pc_after_break is non-zero:
670 If we were single-stepping this process using PTRACE_SINGLESTEP, we
671 will get only the one SIGTRAP. The value of $eip will be the next
672 instruction. If the instruction we stepped over was a breakpoint,
673 we need to decrement the PC.
675 If we continue the process using PTRACE_CONT, we will get a
676 SIGTRAP when we hit a breakpoint. The value of $eip will be
677 the instruction after the breakpoint (i.e. needs to be
678 decremented). If we report the SIGTRAP to GDB, we must also
679 report the undecremented PC. If the breakpoint is removed, we
680 must resume at the decremented PC.
682 On a non-decr_pc_after_break machine with hardware or kernel
685 If we either single-step a breakpoint instruction, or continue and
686 hit a breakpoint instruction, our PC will point at the breakpoint
690 check_stopped_by_breakpoint (struct lwp_info
*lwp
)
693 CORE_ADDR sw_breakpoint_pc
;
694 struct thread_info
*saved_thread
;
695 #if USE_SIGTRAP_SIGINFO
699 if (the_low_target
.get_pc
== NULL
)
703 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
705 /* breakpoint_at reads from the current thread. */
706 saved_thread
= current_thread
;
707 current_thread
= get_lwp_thread (lwp
);
709 #if USE_SIGTRAP_SIGINFO
710 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
711 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
713 if (siginfo
.si_signo
== SIGTRAP
)
715 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
719 struct thread_info
*thr
= get_lwp_thread (lwp
);
721 debug_printf ("CSBB: %s stopped by software breakpoint\n",
722 target_pid_to_str (ptid_of (thr
)));
725 /* Back up the PC if necessary. */
726 if (pc
!= sw_breakpoint_pc
)
728 struct regcache
*regcache
729 = get_thread_regcache (current_thread
, 1);
730 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
733 lwp
->stop_pc
= sw_breakpoint_pc
;
734 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
735 current_thread
= saved_thread
;
738 else if (siginfo
.si_code
== TRAP_HWBKPT
)
742 struct thread_info
*thr
= get_lwp_thread (lwp
);
744 debug_printf ("CSBB: %s stopped by hardware "
745 "breakpoint/watchpoint\n",
746 target_pid_to_str (ptid_of (thr
)));
750 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
751 current_thread
= saved_thread
;
754 else if (siginfo
.si_code
== TRAP_TRACE
)
758 struct thread_info
*thr
= get_lwp_thread (lwp
);
760 debug_printf ("CSBB: %s stopped by trace\n",
761 target_pid_to_str (ptid_of (thr
)));
764 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
769 /* We may have just stepped a breakpoint instruction. E.g., in
770 non-stop mode, GDB first tells the thread A to step a range, and
771 then the user inserts a breakpoint inside the range. In that
772 case we need to report the breakpoint PC. */
773 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
774 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
778 struct thread_info
*thr
= get_lwp_thread (lwp
);
780 debug_printf ("CSBB: %s stopped by software breakpoint\n",
781 target_pid_to_str (ptid_of (thr
)));
784 /* Back up the PC if necessary. */
785 if (pc
!= sw_breakpoint_pc
)
787 struct regcache
*regcache
788 = get_thread_regcache (current_thread
, 1);
789 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
792 lwp
->stop_pc
= sw_breakpoint_pc
;
793 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
794 current_thread
= saved_thread
;
798 if (hardware_breakpoint_inserted_here (pc
))
802 struct thread_info
*thr
= get_lwp_thread (lwp
);
804 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
805 target_pid_to_str (ptid_of (thr
)));
809 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
810 current_thread
= saved_thread
;
815 current_thread
= saved_thread
;
819 static struct lwp_info
*
820 add_lwp (ptid_t ptid
)
822 struct lwp_info
*lwp
;
824 lwp
= XCNEW (struct lwp_info
);
826 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
828 if (the_low_target
.new_thread
!= NULL
)
829 the_low_target
.new_thread (lwp
);
831 lwp
->thread
= add_thread (ptid
, lwp
);
836 /* Start an inferior process and returns its pid.
837 ALLARGS is a vector of program-name and args. */
840 linux_create_inferior (char *program
, char **allargs
)
842 struct lwp_info
*new_lwp
;
845 struct cleanup
*restore_personality
846 = maybe_disable_address_space_randomization (disable_randomization
);
848 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
854 perror_with_name ("fork");
859 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
861 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
862 signal (__SIGRTMIN
+ 1, SIG_DFL
);
867 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
868 stdout to stderr so that inferior i/o doesn't corrupt the connection.
869 Also, redirect stdin to /dev/null. */
870 if (remote_connection_is_stdio ())
873 open ("/dev/null", O_RDONLY
);
875 if (write (2, "stdin/stdout redirected\n",
876 sizeof ("stdin/stdout redirected\n") - 1) < 0)
878 /* Errors ignored. */;
882 execv (program
, allargs
);
884 execvp (program
, allargs
);
886 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
892 do_cleanups (restore_personality
);
894 linux_add_process (pid
, 0);
896 ptid
= ptid_build (pid
, pid
, 0);
897 new_lwp
= add_lwp (ptid
);
898 new_lwp
->must_set_ptrace_flags
= 1;
903 /* Attach to an inferior process. Returns 0 on success, ERRNO on
907 linux_attach_lwp (ptid_t ptid
)
909 struct lwp_info
*new_lwp
;
910 int lwpid
= ptid_get_lwp (ptid
);
912 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
916 new_lwp
= add_lwp (ptid
);
918 /* We need to wait for SIGSTOP before being able to make the next
919 ptrace call on this LWP. */
920 new_lwp
->must_set_ptrace_flags
= 1;
922 if (linux_proc_pid_is_stopped (lwpid
))
925 debug_printf ("Attached to a stopped process\n");
927 /* The process is definitely stopped. It is in a job control
928 stop, unless the kernel predates the TASK_STOPPED /
929 TASK_TRACED distinction, in which case it might be in a
930 ptrace stop. Make sure it is in a ptrace stop; from there we
931 can kill it, signal it, et cetera.
933 First make sure there is a pending SIGSTOP. Since we are
934 already attached, the process can not transition from stopped
935 to running without a PTRACE_CONT; so we know this signal will
936 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
937 probably already in the queue (unless this kernel is old
938 enough to use TASK_STOPPED for ptrace stops); but since
939 SIGSTOP is not an RT signal, it can only be queued once. */
940 kill_lwp (lwpid
, SIGSTOP
);
942 /* Finally, resume the stopped process. This will deliver the
943 SIGSTOP (or a higher priority signal, just like normal
944 PTRACE_ATTACH), which we'll catch later on. */
945 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
948 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
951 There are several cases to consider here:
953 1) gdbserver has already attached to the process and is being notified
954 of a new thread that is being created.
955 In this case we should ignore that SIGSTOP and resume the
956 process. This is handled below by setting stop_expected = 1,
957 and the fact that add_thread sets last_resume_kind ==
960 2) This is the first thread (the process thread), and we're attaching
961 to it via attach_inferior.
962 In this case we want the process thread to stop.
963 This is handled by having linux_attach set last_resume_kind ==
964 resume_stop after we return.
966 If the pid we are attaching to is also the tgid, we attach to and
967 stop all the existing threads. Otherwise, we attach to pid and
968 ignore any other threads in the same group as this pid.
970 3) GDB is connecting to gdbserver and is requesting an enumeration of all
972 In this case we want the thread to stop.
973 FIXME: This case is currently not properly handled.
974 We should wait for the SIGSTOP but don't. Things work apparently
975 because enough time passes between when we ptrace (ATTACH) and when
976 gdb makes the next ptrace call on the thread.
978 On the other hand, if we are currently trying to stop all threads, we
979 should treat the new thread as if we had sent it a SIGSTOP. This works
980 because we are guaranteed that the add_lwp call above added us to the
981 end of the list, and so the new thread has not yet reached
982 wait_for_sigstop (but will). */
983 new_lwp
->stop_expected
= 1;
988 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
989 already attached. Returns true if a new LWP is found, false
993 attach_proc_task_lwp_callback (ptid_t ptid
)
995 /* Is this a new thread? */
996 if (find_thread_ptid (ptid
) == NULL
)
998 int lwpid
= ptid_get_lwp (ptid
);
1002 debug_printf ("Found new lwp %d\n", lwpid
);
1004 err
= linux_attach_lwp (ptid
);
1006 /* Be quiet if we simply raced with the thread exiting. EPERM
1007 is returned if the thread's task still exists, and is marked
1008 as exited or zombie, as well as other conditions, so in that
1009 case, confirm the status in /proc/PID/status. */
1011 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1015 debug_printf ("Cannot attach to lwp %d: "
1016 "thread is gone (%d: %s)\n",
1017 lwpid
, err
, strerror (err
));
1022 warning (_("Cannot attach to lwp %d: %s"),
1024 linux_ptrace_attach_fail_reason_string (ptid
, err
));
1032 /* Attach to PID. If PID is the tgid, attach to it and all
1036 linux_attach (unsigned long pid
)
1038 ptid_t ptid
= ptid_build (pid
, pid
, 0);
1041 /* Attach to PID. We will check for other threads
1043 err
= linux_attach_lwp (ptid
);
1045 error ("Cannot attach to process %ld: %s",
1046 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
1048 linux_add_process (pid
, 1);
1052 struct thread_info
*thread
;
1054 /* Don't ignore the initial SIGSTOP if we just attached to this
1055 process. It will be collected by wait shortly. */
1056 thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
1057 thread
->last_resume_kind
= resume_stop
;
1060 /* We must attach to every LWP. If /proc is mounted, use that to
1061 find them now. On the one hand, the inferior may be using raw
1062 clone instead of using pthreads. On the other hand, even if it
1063 is using pthreads, GDB may not be connected yet (thread_db needs
1064 to do symbol lookups, through qSymbol). Also, thread_db walks
1065 structures in the inferior's address space to find the list of
1066 threads/LWPs, and those structures may well be corrupted. Note
1067 that once thread_db is loaded, we'll still use it to list threads
1068 and associate pthread info with each LWP. */
1069 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1080 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
1082 struct counter
*counter
= (struct counter
*) args
;
1084 if (ptid_get_pid (entry
->id
) == counter
->pid
)
1086 if (++counter
->count
> 1)
1094 last_thread_of_process_p (int pid
)
1096 struct counter counter
= { pid
, 0 };
1098 return (find_inferior (&all_threads
,
1099 second_thread_of_pid_p
, &counter
) == NULL
);
1105 linux_kill_one_lwp (struct lwp_info
*lwp
)
1107 struct thread_info
*thr
= get_lwp_thread (lwp
);
1108 int pid
= lwpid_of (thr
);
1110 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1111 there is no signal context, and ptrace(PTRACE_KILL) (or
1112 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1113 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1114 alternative is to kill with SIGKILL. We only need one SIGKILL
1115 per process, not one for each thread. But since we still support
1116 linuxthreads, and we also support debugging programs using raw
1117 clone without CLONE_THREAD, we send one for each thread. For
1118 years, we used PTRACE_KILL only, so we're being a bit paranoid
1119 about some old kernels where PTRACE_KILL might work better
1120 (dubious if there are any such, but that's why it's paranoia), so
1121 we try SIGKILL first, PTRACE_KILL second, and so we're fine
1125 kill_lwp (pid
, SIGKILL
);
1128 int save_errno
= errno
;
1130 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1131 target_pid_to_str (ptid_of (thr
)),
1132 save_errno
? strerror (save_errno
) : "OK");
1136 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1139 int save_errno
= errno
;
1141 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1142 target_pid_to_str (ptid_of (thr
)),
1143 save_errno
? strerror (save_errno
) : "OK");
1147 /* Kill LWP and wait for it to die. */
1150 kill_wait_lwp (struct lwp_info
*lwp
)
1152 struct thread_info
*thr
= get_lwp_thread (lwp
);
1153 int pid
= ptid_get_pid (ptid_of (thr
));
1154 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1159 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1163 linux_kill_one_lwp (lwp
);
1165 /* Make sure it died. Notes:
1167 - The loop is most likely unnecessary.
1169 - We don't use linux_wait_for_event as that could delete lwps
1170 while we're iterating over them. We're not interested in
1171 any pending status at this point, only in making sure all
1172 wait status on the kernel side are collected until the
1175 - We don't use __WALL here as the __WALL emulation relies on
1176 SIGCHLD, and killing a stopped process doesn't generate
1177 one, nor an exit status.
1179 res
= my_waitpid (lwpid
, &wstat
, 0);
1180 if (res
== -1 && errno
== ECHILD
)
1181 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1182 } while (res
> 0 && WIFSTOPPED (wstat
));
1184 /* Even if it was stopped, the child may have already disappeared.
1185 E.g., if it was killed by SIGKILL. */
1186 if (res
< 0 && errno
!= ECHILD
)
1187 perror_with_name ("kill_wait_lwp");
1190 /* Callback for `find_inferior'. Kills an lwp of a given process,
1191 except the leader. */
1194 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1196 struct thread_info
*thread
= (struct thread_info
*) entry
;
1197 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1198 int pid
= * (int *) args
;
1200 if (ptid_get_pid (entry
->id
) != pid
)
1203 /* We avoid killing the first thread here, because of a Linux kernel (at
1204 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1205 the children get a chance to be reaped, it will remain a zombie
1208 if (lwpid_of (thread
) == pid
)
1211 debug_printf ("lkop: is last of process %s\n",
1212 target_pid_to_str (entry
->id
));
1216 kill_wait_lwp (lwp
);
1221 linux_kill (int pid
)
1223 struct process_info
*process
;
1224 struct lwp_info
*lwp
;
1226 process
= find_process_pid (pid
);
1227 if (process
== NULL
)
1230 /* If we're killing a running inferior, make sure it is stopped
1231 first, as PTRACE_KILL will not work otherwise. */
1232 stop_all_lwps (0, NULL
);
1234 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1236 /* See the comment in linux_kill_one_lwp. We did not kill the first
1237 thread in the list, so do so now. */
1238 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1243 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1247 kill_wait_lwp (lwp
);
1249 the_target
->mourn (process
);
1251 /* Since we presently can only stop all lwps of all processes, we
1252 need to unstop lwps of other processes. */
1253 unstop_all_lwps (0, NULL
);
1257 /* Get pending signal of THREAD, for detaching purposes. This is the
1258 signal the thread last stopped for, which we need to deliver to the
1259 thread when detaching, otherwise, it'd be suppressed/lost. */
1262 get_detach_signal (struct thread_info
*thread
)
1264 enum gdb_signal signo
= GDB_SIGNAL_0
;
1266 struct lwp_info
*lp
= get_thread_lwp (thread
);
1268 if (lp
->status_pending_p
)
1269 status
= lp
->status_pending
;
1272 /* If the thread had been suspended by gdbserver, and it stopped
1273 cleanly, then it'll have stopped with SIGSTOP. But we don't
1274 want to deliver that SIGSTOP. */
1275 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1276 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1279 /* Otherwise, we may need to deliver the signal we
1281 status
= lp
->last_status
;
1284 if (!WIFSTOPPED (status
))
1287 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1288 target_pid_to_str (ptid_of (thread
)));
1292 /* Extended wait statuses aren't real SIGTRAPs. */
1293 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1296 debug_printf ("GPS: lwp %s had stopped with extended "
1297 "status: no pending signal\n",
1298 target_pid_to_str (ptid_of (thread
)));
1302 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1304 if (program_signals_p
&& !program_signals
[signo
])
1307 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1308 target_pid_to_str (ptid_of (thread
)),
1309 gdb_signal_to_string (signo
));
1312 else if (!program_signals_p
1313 /* If we have no way to know which signals GDB does not
1314 want to have passed to the program, assume
1315 SIGTRAP/SIGINT, which is GDB's default. */
1316 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1319 debug_printf ("GPS: lwp %s had signal %s, "
1320 "but we don't know if we should pass it. "
1321 "Default to not.\n",
1322 target_pid_to_str (ptid_of (thread
)),
1323 gdb_signal_to_string (signo
));
1329 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1330 target_pid_to_str (ptid_of (thread
)),
1331 gdb_signal_to_string (signo
));
1333 return WSTOPSIG (status
);
1338 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
1340 struct thread_info
*thread
= (struct thread_info
*) entry
;
1341 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1342 int pid
= * (int *) args
;
1345 if (ptid_get_pid (entry
->id
) != pid
)
1348 /* If there is a pending SIGSTOP, get rid of it. */
1349 if (lwp
->stop_expected
)
1352 debug_printf ("Sending SIGCONT to %s\n",
1353 target_pid_to_str (ptid_of (thread
)));
1355 kill_lwp (lwpid_of (thread
), SIGCONT
);
1356 lwp
->stop_expected
= 0;
1359 /* Flush any pending changes to the process's registers. */
1360 regcache_invalidate_thread (thread
);
1362 /* Pass on any pending signal for this thread. */
1363 sig
= get_detach_signal (thread
);
1365 /* Finally, let it resume. */
1366 if (the_low_target
.prepare_to_resume
!= NULL
)
1367 the_low_target
.prepare_to_resume (lwp
);
1368 if (ptrace (PTRACE_DETACH
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1369 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1370 error (_("Can't detach %s: %s"),
1371 target_pid_to_str (ptid_of (thread
)),
1379 linux_detach (int pid
)
1381 struct process_info
*process
;
1383 process
= find_process_pid (pid
);
1384 if (process
== NULL
)
1387 /* As there's a step over already in progress, let it finish first,
1388 otherwise nesting a stabilize_threads operation on top gets real
1390 complete_ongoing_step_over ();
1392 /* Stop all threads before detaching. First, ptrace requires that
1393 the thread is stopped to sucessfully detach. Second, thread_db
1394 may need to uninstall thread event breakpoints from memory, which
1395 only works with a stopped process anyway. */
1396 stop_all_lwps (0, NULL
);
1398 #ifdef USE_THREAD_DB
1399 thread_db_detach (process
);
1402 /* Stabilize threads (move out of jump pads). */
1403 stabilize_threads ();
1405 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
1407 the_target
->mourn (process
);
1409 /* Since we presently can only stop all lwps of all processes, we
1410 need to unstop lwps of other processes. */
1411 unstop_all_lwps (0, NULL
);
1415 /* Remove all LWPs that belong to process PROC from the lwp list. */
1418 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1420 struct thread_info
*thread
= (struct thread_info
*) entry
;
1421 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1422 struct process_info
*process
= (struct process_info
*) proc
;
1424 if (pid_of (thread
) == pid_of (process
))
1431 linux_mourn (struct process_info
*process
)
1433 struct process_info_private
*priv
;
1435 #ifdef USE_THREAD_DB
1436 thread_db_mourn (process
);
1439 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1441 /* Freeing all private data. */
1442 priv
= process
->priv
;
1443 free (priv
->arch_private
);
1445 process
->priv
= NULL
;
1447 remove_process (process
);
1451 linux_join (int pid
)
1456 ret
= my_waitpid (pid
, &status
, 0);
1457 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1459 } while (ret
!= -1 || errno
!= ECHILD
);
1462 /* Return nonzero if the given thread is still alive. */
1464 linux_thread_alive (ptid_t ptid
)
1466 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1468 /* We assume we always know if a thread exits. If a whole process
1469 exited but we still haven't been able to report it to GDB, we'll
1470 hold on to the last lwp of the dead process. */
1472 return !lwp_is_marked_dead (lwp
);
1477 /* Return 1 if this lwp still has an interesting status pending. If
1478 not (e.g., it had stopped for a breakpoint that is gone), return
1482 thread_still_has_status_pending_p (struct thread_info
*thread
)
1484 struct lwp_info
*lp
= get_thread_lwp (thread
);
1486 if (!lp
->status_pending_p
)
1489 /* If we got a `vCont;t', but we haven't reported a stop yet, do
1490 report any status pending the LWP may have. */
1491 if (thread
->last_resume_kind
== resume_stop
1492 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
1495 if (thread
->last_resume_kind
!= resume_stop
1496 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1497 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1499 struct thread_info
*saved_thread
;
1503 gdb_assert (lp
->last_status
!= 0);
1507 saved_thread
= current_thread
;
1508 current_thread
= thread
;
1510 if (pc
!= lp
->stop_pc
)
1513 debug_printf ("PC of %ld changed\n",
1518 #if !USE_SIGTRAP_SIGINFO
1519 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1520 && !(*the_low_target
.breakpoint_at
) (pc
))
1523 debug_printf ("previous SW breakpoint of %ld gone\n",
1527 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1528 && !hardware_breakpoint_inserted_here (pc
))
1531 debug_printf ("previous HW breakpoint of %ld gone\n",
1537 current_thread
= saved_thread
;
1542 debug_printf ("discarding pending breakpoint status\n");
1543 lp
->status_pending_p
= 0;
1551 /* Return 1 if this lwp has an interesting status pending. */
1553 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1555 struct thread_info
*thread
= (struct thread_info
*) entry
;
1556 struct lwp_info
*lp
= get_thread_lwp (thread
);
1557 ptid_t ptid
= * (ptid_t
*) arg
;
1559 /* Check if we're only interested in events from a specific process
1560 or a specific LWP. */
1561 if (!ptid_match (ptid_of (thread
), ptid
))
1564 if (lp
->status_pending_p
1565 && !thread_still_has_status_pending_p (thread
))
1567 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1571 return lp
->status_pending_p
;
1575 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1577 ptid_t ptid
= *(ptid_t
*) data
;
1580 if (ptid_get_lwp (ptid
) != 0)
1581 lwp
= ptid_get_lwp (ptid
);
1583 lwp
= ptid_get_pid (ptid
);
1585 if (ptid_get_lwp (entry
->id
) == lwp
)
1592 find_lwp_pid (ptid_t ptid
)
1594 struct inferior_list_entry
*thread
1595 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1600 return get_thread_lwp ((struct thread_info
*) thread
);
1603 /* Return the number of known LWPs in the tgid given by PID. */
1608 struct inferior_list_entry
*inf
, *tmp
;
1611 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1613 if (ptid_get_pid (inf
->id
) == pid
)
1620 /* The arguments passed to iterate_over_lwps. */
1622 struct iterate_over_lwps_args
1624 /* The FILTER argument passed to iterate_over_lwps. */
1627 /* The CALLBACK argument passed to iterate_over_lwps. */
1628 iterate_over_lwps_ftype
*callback
;
1630 /* The DATA argument passed to iterate_over_lwps. */
1634 /* Callback for find_inferior used by iterate_over_lwps to filter
1635 calls to the callback supplied to that function. Returning a
1636 nonzero value causes find_inferiors to stop iterating and return
1637 the current inferior_list_entry. Returning zero indicates that
1638 find_inferiors should continue iterating. */
1641 iterate_over_lwps_filter (struct inferior_list_entry
*entry
, void *args_p
)
1643 struct iterate_over_lwps_args
*args
1644 = (struct iterate_over_lwps_args
*) args_p
;
1646 if (ptid_match (entry
->id
, args
->filter
))
1648 struct thread_info
*thr
= (struct thread_info
*) entry
;
1649 struct lwp_info
*lwp
= get_thread_lwp (thr
);
1651 return (*args
->callback
) (lwp
, args
->data
);
1657 /* See nat/linux-nat.h. */
1660 iterate_over_lwps (ptid_t filter
,
1661 iterate_over_lwps_ftype callback
,
1664 struct iterate_over_lwps_args args
= {filter
, callback
, data
};
1665 struct inferior_list_entry
*entry
;
1667 entry
= find_inferior (&all_threads
, iterate_over_lwps_filter
, &args
);
1671 return get_thread_lwp ((struct thread_info
*) entry
);
1674 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1675 their exits until all other threads in the group have exited. */
1678 check_zombie_leaders (void)
1680 struct process_info
*proc
, *tmp
;
1682 ALL_PROCESSES (proc
, tmp
)
1684 pid_t leader_pid
= pid_of (proc
);
1685 struct lwp_info
*leader_lp
;
1687 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1690 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1691 "num_lwps=%d, zombie=%d\n",
1692 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1693 linux_proc_pid_is_zombie (leader_pid
));
1695 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1696 /* Check if there are other threads in the group, as we may
1697 have raced with the inferior simply exiting. */
1698 && !last_thread_of_process_p (leader_pid
)
1699 && linux_proc_pid_is_zombie (leader_pid
))
1701 /* A leader zombie can mean one of two things:
1703 - It exited, and there's an exit status pending
1704 available, or only the leader exited (not the whole
1705 program). In the latter case, we can't waitpid the
1706 leader's exit status until all other threads are gone.
1708 - There are 3 or more threads in the group, and a thread
1709 other than the leader exec'd. On an exec, the Linux
1710 kernel destroys all other threads (except the execing
1711 one) in the thread group, and resets the execing thread's
1712 tid to the tgid. No exit notification is sent for the
1713 execing thread -- from the ptracer's perspective, it
1714 appears as though the execing thread just vanishes.
1715 Until we reap all other threads except the leader and the
1716 execing thread, the leader will be zombie, and the
1717 execing thread will be in `D (disc sleep)'. As soon as
1718 all other threads are reaped, the execing thread changes
1719 it's tid to the tgid, and the previous (zombie) leader
1720 vanishes, giving place to the "new" leader. We could try
1721 distinguishing the exit and exec cases, by waiting once
1722 more, and seeing if something comes out, but it doesn't
1723 sound useful. The previous leader _does_ go away, and
1724 we'll re-add the new one once we see the exec event
1725 (which is just the same as what would happen if the
1726 previous leader did exit voluntarily before some other
1731 "CZL: Thread group leader %d zombie "
1732 "(it exited, or another thread execd).\n",
1735 delete_lwp (leader_lp
);
1740 /* Callback for `find_inferior'. Returns the first LWP that is not
1741 stopped. ARG is a PTID filter. */
1744 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
1746 struct thread_info
*thr
= (struct thread_info
*) entry
;
1747 struct lwp_info
*lwp
;
1748 ptid_t filter
= *(ptid_t
*) arg
;
1750 if (!ptid_match (ptid_of (thr
), filter
))
1753 lwp
= get_thread_lwp (thr
);
1760 /* Increment LWP's suspend count. */
1763 lwp_suspended_inc (struct lwp_info
*lwp
)
1767 if (debug_threads
&& lwp
->suspended
> 4)
1769 struct thread_info
*thread
= get_lwp_thread (lwp
);
1771 debug_printf ("LWP %ld has a suspiciously high suspend count,"
1772 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
1776 /* Decrement LWP's suspend count. */
1779 lwp_suspended_decr (struct lwp_info
*lwp
)
1783 if (lwp
->suspended
< 0)
1785 struct thread_info
*thread
= get_lwp_thread (lwp
);
1787 internal_error (__FILE__
, __LINE__
,
1788 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
1793 /* This function should only be called if the LWP got a SIGTRAP.
1795 Handle any tracepoint steps or hits. Return true if a tracepoint
1796 event was handled, 0 otherwise. */
1799 handle_tracepoints (struct lwp_info
*lwp
)
1801 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1802 int tpoint_related_event
= 0;
1804 gdb_assert (lwp
->suspended
== 0);
1806 /* If this tracepoint hit causes a tracing stop, we'll immediately
1807 uninsert tracepoints. To do this, we temporarily pause all
1808 threads, unpatch away, and then unpause threads. We need to make
1809 sure the unpausing doesn't resume LWP too. */
1810 lwp_suspended_inc (lwp
);
1812 /* And we need to be sure that any all-threads-stopping doesn't try
1813 to move threads out of the jump pads, as it could deadlock the
1814 inferior (LWP could be in the jump pad, maybe even holding the
1817 /* Do any necessary step collect actions. */
1818 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1820 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1822 /* See if we just hit a tracepoint and do its main collect
1824 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1826 lwp_suspended_decr (lwp
);
1828 gdb_assert (lwp
->suspended
== 0);
1829 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
1831 if (tpoint_related_event
)
1834 debug_printf ("got a tracepoint event\n");
1841 /* Convenience wrapper. Returns true if LWP is presently collecting a
1845 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
1846 struct fast_tpoint_collect_status
*status
)
1848 CORE_ADDR thread_area
;
1849 struct thread_info
*thread
= get_lwp_thread (lwp
);
1851 if (the_low_target
.get_thread_area
== NULL
)
1854 /* Get the thread area address. This is used to recognize which
1855 thread is which when tracing with the in-process agent library.
1856 We don't read anything from the address, and treat it as opaque;
1857 it's the address itself that we assume is unique per-thread. */
1858 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
1861 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1864 /* The reason we resume in the caller, is because we want to be able
1865 to pass lwp->status_pending as WSTAT, and we need to clear
1866 status_pending_p before resuming, otherwise, linux_resume_one_lwp
1867 refuses to resume. */
1870 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
1872 struct thread_info
*saved_thread
;
1874 saved_thread
= current_thread
;
1875 current_thread
= get_lwp_thread (lwp
);
1878 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
1879 && supports_fast_tracepoints ()
1880 && agent_loaded_p ())
1882 struct fast_tpoint_collect_status status
;
1886 debug_printf ("Checking whether LWP %ld needs to move out of the "
1888 lwpid_of (current_thread
));
1890 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
1893 || (WSTOPSIG (*wstat
) != SIGILL
1894 && WSTOPSIG (*wstat
) != SIGFPE
1895 && WSTOPSIG (*wstat
) != SIGSEGV
1896 && WSTOPSIG (*wstat
) != SIGBUS
))
1898 lwp
->collecting_fast_tracepoint
= r
;
1902 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
1904 /* Haven't executed the original instruction yet.
1905 Set breakpoint there, and wait till it's hit,
1906 then single-step until exiting the jump pad. */
1907 lwp
->exit_jump_pad_bkpt
1908 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
1912 debug_printf ("Checking whether LWP %ld needs to move out of "
1913 "the jump pad...it does\n",
1914 lwpid_of (current_thread
));
1915 current_thread
= saved_thread
;
1922 /* If we get a synchronous signal while collecting, *and*
1923 while executing the (relocated) original instruction,
1924 reset the PC to point at the tpoint address, before
1925 reporting to GDB. Otherwise, it's an IPA lib bug: just
1926 report the signal to GDB, and pray for the best. */
1928 lwp
->collecting_fast_tracepoint
= 0;
1931 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
1932 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
1935 struct regcache
*regcache
;
1937 /* The si_addr on a few signals references the address
1938 of the faulting instruction. Adjust that as
1940 if ((WSTOPSIG (*wstat
) == SIGILL
1941 || WSTOPSIG (*wstat
) == SIGFPE
1942 || WSTOPSIG (*wstat
) == SIGBUS
1943 || WSTOPSIG (*wstat
) == SIGSEGV
)
1944 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
1945 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
1946 /* Final check just to make sure we don't clobber
1947 the siginfo of non-kernel-sent signals. */
1948 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
1950 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
1951 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
1952 (PTRACE_TYPE_ARG3
) 0, &info
);
1955 regcache
= get_thread_regcache (current_thread
, 1);
1956 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
1957 lwp
->stop_pc
= status
.tpoint_addr
;
1959 /* Cancel any fast tracepoint lock this thread was
1961 force_unlock_trace_buffer ();
1964 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
1967 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
1968 "stopping all threads momentarily.\n");
1970 stop_all_lwps (1, lwp
);
1972 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
1973 lwp
->exit_jump_pad_bkpt
= NULL
;
1975 unstop_all_lwps (1, lwp
);
1977 gdb_assert (lwp
->suspended
>= 0);
1983 debug_printf ("Checking whether LWP %ld needs to move out of the "
1985 lwpid_of (current_thread
));
1987 current_thread
= saved_thread
;
1991 /* Enqueue one signal in the "signals to report later when out of the
1995 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1997 struct pending_signals
*p_sig
;
1998 struct thread_info
*thread
= get_lwp_thread (lwp
);
2001 debug_printf ("Deferring signal %d for LWP %ld.\n",
2002 WSTOPSIG (*wstat
), lwpid_of (thread
));
2006 struct pending_signals
*sig
;
2008 for (sig
= lwp
->pending_signals_to_report
;
2011 debug_printf (" Already queued %d\n",
2014 debug_printf (" (no more currently queued signals)\n");
2017 /* Don't enqueue non-RT signals if they are already in the deferred
2018 queue. (SIGSTOP being the easiest signal to see ending up here
2020 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2022 struct pending_signals
*sig
;
2024 for (sig
= lwp
->pending_signals_to_report
;
2028 if (sig
->signal
== WSTOPSIG (*wstat
))
2031 debug_printf ("Not requeuing already queued non-RT signal %d"
2040 p_sig
= XCNEW (struct pending_signals
);
2041 p_sig
->prev
= lwp
->pending_signals_to_report
;
2042 p_sig
->signal
= WSTOPSIG (*wstat
);
2044 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2047 lwp
->pending_signals_to_report
= p_sig
;
2050 /* Dequeue one signal from the "signals to report later when out of
2051 the jump pad" list. */
2054 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2056 struct thread_info
*thread
= get_lwp_thread (lwp
);
2058 if (lwp
->pending_signals_to_report
!= NULL
)
2060 struct pending_signals
**p_sig
;
2062 p_sig
= &lwp
->pending_signals_to_report
;
2063 while ((*p_sig
)->prev
!= NULL
)
2064 p_sig
= &(*p_sig
)->prev
;
2066 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2067 if ((*p_sig
)->info
.si_signo
!= 0)
2068 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2074 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2075 WSTOPSIG (*wstat
), lwpid_of (thread
));
2079 struct pending_signals
*sig
;
2081 for (sig
= lwp
->pending_signals_to_report
;
2084 debug_printf (" Still queued %d\n",
2087 debug_printf (" (no more queued signals)\n");
2096 /* Fetch the possibly triggered data watchpoint info and store it in
2099 On some archs, like x86, that use debug registers to set
2100 watchpoints, it's possible that the way to know which watched
2101 address trapped, is to check the register that is used to select
2102 which address to watch. Problem is, between setting the watchpoint
2103 and reading back which data address trapped, the user may change
2104 the set of watchpoints, and, as a consequence, GDB changes the
2105 debug registers in the inferior. To avoid reading back a stale
2106 stopped-data-address when that happens, we cache in LP the fact
2107 that a watchpoint trapped, and the corresponding data address, as
2108 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2109 registers meanwhile, we have the cached data we can rely on. */
2112 check_stopped_by_watchpoint (struct lwp_info
*child
)
2114 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2116 struct thread_info
*saved_thread
;
2118 saved_thread
= current_thread
;
2119 current_thread
= get_lwp_thread (child
);
2121 if (the_low_target
.stopped_by_watchpoint ())
2123 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2125 if (the_low_target
.stopped_data_address
!= NULL
)
2126 child
->stopped_data_address
2127 = the_low_target
.stopped_data_address ();
2129 child
->stopped_data_address
= 0;
2132 current_thread
= saved_thread
;
2135 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2138 /* Return the ptrace options that we want to try to enable. */
2141 linux_low_ptrace_options (int attached
)
2146 options
|= PTRACE_O_EXITKILL
;
2148 if (report_fork_events
)
2149 options
|= PTRACE_O_TRACEFORK
;
2151 if (report_vfork_events
)
2152 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2154 if (report_exec_events
)
2155 options
|= PTRACE_O_TRACEEXEC
;
2160 /* Do low-level handling of the event, and check if we should go on
2161 and pass it to caller code. Return the affected lwp if we are, or
2164 static struct lwp_info
*
2165 linux_low_filter_event (int lwpid
, int wstat
)
2167 struct lwp_info
*child
;
2168 struct thread_info
*thread
;
2169 int have_stop_pc
= 0;
2171 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2173 /* Check for stop events reported by a process we didn't already
2174 know about - anything not already in our LWP list.
2176 If we're expecting to receive stopped processes after
2177 fork, vfork, and clone events, then we'll just add the
2178 new one to our list and go back to waiting for the event
2179 to be reported - the stopped process might be returned
2180 from waitpid before or after the event is.
2182 But note the case of a non-leader thread exec'ing after the
2183 leader having exited, and gone from our lists (because
2184 check_zombie_leaders deleted it). The non-leader thread
2185 changes its tid to the tgid. */
2187 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2188 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2192 /* A multi-thread exec after we had seen the leader exiting. */
2195 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2196 "after exec.\n", lwpid
);
2199 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2200 child
= add_lwp (child_ptid
);
2202 current_thread
= child
->thread
;
2205 /* If we didn't find a process, one of two things presumably happened:
2206 - A process we started and then detached from has exited. Ignore it.
2207 - A process we are controlling has forked and the new child's stop
2208 was reported to us by the kernel. Save its PID. */
2209 if (child
== NULL
&& WIFSTOPPED (wstat
))
2211 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2214 else if (child
== NULL
)
2217 thread
= get_lwp_thread (child
);
2221 child
->last_status
= wstat
;
2223 /* Check if the thread has exited. */
2224 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2227 debug_printf ("LLFE: %d exited.\n", lwpid
);
2228 if (num_lwps (pid_of (thread
)) > 1)
2231 /* If there is at least one more LWP, then the exit signal was
2232 not the end of the debugged application and should be
2239 /* This was the last lwp in the process. Since events are
2240 serialized to GDB core, and we can't report this one
2241 right now, but GDB core and the other target layers will
2242 want to be notified about the exit code/signal, leave the
2243 status pending for the next time we're able to report
2245 mark_lwp_dead (child
, wstat
);
2250 gdb_assert (WIFSTOPPED (wstat
));
2252 if (WIFSTOPPED (wstat
))
2254 struct process_info
*proc
;
2256 /* Architecture-specific setup after inferior is running. */
2257 proc
= find_process_pid (pid_of (thread
));
2258 if (proc
->tdesc
== NULL
)
2262 /* This needs to happen after we have attached to the
2263 inferior and it is stopped for the first time, but
2264 before we access any inferior registers. */
2265 linux_arch_setup_thread (thread
);
2269 /* The process is started, but GDBserver will do
2270 architecture-specific setup after the program stops at
2271 the first instruction. */
2272 child
->status_pending_p
= 1;
2273 child
->status_pending
= wstat
;
2279 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2281 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2282 int options
= linux_low_ptrace_options (proc
->attached
);
2284 linux_enable_event_reporting (lwpid
, options
);
2285 child
->must_set_ptrace_flags
= 0;
2288 /* Be careful to not overwrite stop_pc until
2289 check_stopped_by_breakpoint is called. */
2290 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2291 && linux_is_extended_waitstatus (wstat
))
2293 child
->stop_pc
= get_pc (child
);
2294 if (handle_extended_wait (&child
, wstat
))
2296 /* The event has been handled, so just return without
2302 /* Check first whether this was a SW/HW breakpoint before checking
2303 watchpoints, because at least s390 can't tell the data address of
2304 hardware watchpoint hits, and returns stopped-by-watchpoint as
2305 long as there's a watchpoint set. */
2306 if (WIFSTOPPED (wstat
) && linux_wstatus_maybe_breakpoint (wstat
))
2308 if (check_stopped_by_breakpoint (child
))
2312 /* Note that TRAP_HWBKPT can indicate either a hardware breakpoint
2313 or hardware watchpoint. Check which is which if we got
2314 TARGET_STOPPED_BY_HW_BREAKPOINT. Likewise, we may have single
2315 stepped an instruction that triggered a watchpoint. In that
2316 case, on some architectures (such as x86), instead of
2317 TRAP_HWBKPT, si_code indicates TRAP_TRACE, and we need to check
2318 the debug registers separately. */
2319 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2320 && child
->stop_reason
!= TARGET_STOPPED_BY_SW_BREAKPOINT
)
2321 check_stopped_by_watchpoint (child
);
2324 child
->stop_pc
= get_pc (child
);
2326 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2327 && child
->stop_expected
)
2330 debug_printf ("Expected stop.\n");
2331 child
->stop_expected
= 0;
2333 if (thread
->last_resume_kind
== resume_stop
)
2335 /* We want to report the stop to the core. Treat the
2336 SIGSTOP as a normal event. */
2338 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2339 target_pid_to_str (ptid_of (thread
)));
2341 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2343 /* Stopping threads. We don't want this SIGSTOP to end up
2346 debug_printf ("LLW: SIGSTOP caught for %s "
2347 "while stopping threads.\n",
2348 target_pid_to_str (ptid_of (thread
)));
2353 /* This is a delayed SIGSTOP. Filter out the event. */
2355 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2356 child
->stepping
? "step" : "continue",
2357 target_pid_to_str (ptid_of (thread
)));
2359 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2364 child
->status_pending_p
= 1;
2365 child
->status_pending
= wstat
;
2369 /* Resume LWPs that are currently stopped without any pending status
2370 to report, but are resumed from the core's perspective. */
2373 resume_stopped_resumed_lwps (struct inferior_list_entry
*entry
)
2375 struct thread_info
*thread
= (struct thread_info
*) entry
;
2376 struct lwp_info
*lp
= get_thread_lwp (thread
);
2380 && !lp
->status_pending_p
2381 && thread
->last_resume_kind
!= resume_stop
2382 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2384 int step
= thread
->last_resume_kind
== resume_step
;
2387 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2388 target_pid_to_str (ptid_of (thread
)),
2389 paddress (lp
->stop_pc
),
2392 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2396 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2397 match FILTER_PTID (leaving others pending). The PTIDs can be:
2398 minus_one_ptid, to specify any child; a pid PTID, specifying all
2399 lwps of a thread group; or a PTID representing a single lwp. Store
2400 the stop status through the status pointer WSTAT. OPTIONS is
2401 passed to the waitpid call. Return 0 if no event was found and
2402 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2403 was found. Return the PID of the stopped child otherwise. */
2406 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2407 int *wstatp
, int options
)
2409 struct thread_info
*event_thread
;
2410 struct lwp_info
*event_child
, *requested_child
;
2411 sigset_t block_mask
, prev_mask
;
2414 /* N.B. event_thread points to the thread_info struct that contains
2415 event_child. Keep them in sync. */
2416 event_thread
= NULL
;
2418 requested_child
= NULL
;
2420 /* Check for a lwp with a pending status. */
2422 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2424 event_thread
= (struct thread_info
*)
2425 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2426 if (event_thread
!= NULL
)
2427 event_child
= get_thread_lwp (event_thread
);
2428 if (debug_threads
&& event_thread
)
2429 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2431 else if (!ptid_equal (filter_ptid
, null_ptid
))
2433 requested_child
= find_lwp_pid (filter_ptid
);
2435 if (stopping_threads
== NOT_STOPPING_THREADS
2436 && requested_child
->status_pending_p
2437 && requested_child
->collecting_fast_tracepoint
)
2439 enqueue_one_deferred_signal (requested_child
,
2440 &requested_child
->status_pending
);
2441 requested_child
->status_pending_p
= 0;
2442 requested_child
->status_pending
= 0;
2443 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2446 if (requested_child
->suspended
2447 && requested_child
->status_pending_p
)
2449 internal_error (__FILE__
, __LINE__
,
2450 "requesting an event out of a"
2451 " suspended child?");
2454 if (requested_child
->status_pending_p
)
2456 event_child
= requested_child
;
2457 event_thread
= get_lwp_thread (event_child
);
2461 if (event_child
!= NULL
)
2464 debug_printf ("Got an event from pending child %ld (%04x)\n",
2465 lwpid_of (event_thread
), event_child
->status_pending
);
2466 *wstatp
= event_child
->status_pending
;
2467 event_child
->status_pending_p
= 0;
2468 event_child
->status_pending
= 0;
2469 current_thread
= event_thread
;
2470 return lwpid_of (event_thread
);
2473 /* But if we don't find a pending event, we'll have to wait.
2475 We only enter this loop if no process has a pending wait status.
2476 Thus any action taken in response to a wait status inside this
2477 loop is responding as soon as we detect the status, not after any
2480 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2481 all signals while here. */
2482 sigfillset (&block_mask
);
2483 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2485 /* Always pull all events out of the kernel. We'll randomly select
2486 an event LWP out of all that have events, to prevent
2488 while (event_child
== NULL
)
2492 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2495 - If the thread group leader exits while other threads in the
2496 thread group still exist, waitpid(TGID, ...) hangs. That
2497 waitpid won't return an exit status until the other threads
2498 in the group are reaped.
2500 - When a non-leader thread execs, that thread just vanishes
2501 without reporting an exit (so we'd hang if we waited for it
2502 explicitly in that case). The exec event is reported to
2505 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2508 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2509 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2515 debug_printf ("LLW: waitpid %ld received %s\n",
2516 (long) ret
, status_to_str (*wstatp
));
2519 /* Filter all events. IOW, leave all events pending. We'll
2520 randomly select an event LWP out of all that have events
2522 linux_low_filter_event (ret
, *wstatp
);
2523 /* Retry until nothing comes out of waitpid. A single
2524 SIGCHLD can indicate more than one child stopped. */
2528 /* Now that we've pulled all events out of the kernel, resume
2529 LWPs that don't have an interesting event to report. */
2530 if (stopping_threads
== NOT_STOPPING_THREADS
)
2531 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2533 /* ... and find an LWP with a status to report to the core, if
2535 event_thread
= (struct thread_info
*)
2536 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2537 if (event_thread
!= NULL
)
2539 event_child
= get_thread_lwp (event_thread
);
2540 *wstatp
= event_child
->status_pending
;
2541 event_child
->status_pending_p
= 0;
2542 event_child
->status_pending
= 0;
2546 /* Check for zombie thread group leaders. Those can't be reaped
2547 until all other threads in the thread group are. */
2548 check_zombie_leaders ();
2550 /* If there are no resumed children left in the set of LWPs we
2551 want to wait for, bail. We can't just block in
2552 waitpid/sigsuspend, because lwps might have been left stopped
2553 in trace-stop state, and we'd be stuck forever waiting for
2554 their status to change (which would only happen if we resumed
2555 them). Even if WNOHANG is set, this return code is preferred
2556 over 0 (below), as it is more detailed. */
2557 if ((find_inferior (&all_threads
,
2558 not_stopped_callback
,
2559 &wait_ptid
) == NULL
))
2562 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2563 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2567 /* No interesting event to report to the caller. */
2568 if ((options
& WNOHANG
))
2571 debug_printf ("WNOHANG set, no event found\n");
2573 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2577 /* Block until we get an event reported with SIGCHLD. */
2579 debug_printf ("sigsuspend'ing\n");
2581 sigsuspend (&prev_mask
);
2582 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2586 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2588 current_thread
= event_thread
;
2590 /* Check for thread exit. */
2591 if (! WIFSTOPPED (*wstatp
))
2593 gdb_assert (last_thread_of_process_p (pid_of (event_thread
)));
2596 debug_printf ("LWP %d is the last lwp of process. "
2597 "Process %ld exiting.\n",
2598 pid_of (event_thread
), lwpid_of (event_thread
));
2599 return lwpid_of (event_thread
);
2602 return lwpid_of (event_thread
);
2605 /* Wait for an event from child(ren) PTID. PTIDs can be:
2606 minus_one_ptid, to specify any child; a pid PTID, specifying all
2607 lwps of a thread group; or a PTID representing a single lwp. Store
2608 the stop status through the status pointer WSTAT. OPTIONS is
2609 passed to the waitpid call. Return 0 if no event was found and
2610 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2611 was found. Return the PID of the stopped child otherwise. */
2614 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2616 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2619 /* Count the LWP's that have had events. */
2622 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2624 struct thread_info
*thread
= (struct thread_info
*) entry
;
2625 struct lwp_info
*lp
= get_thread_lwp (thread
);
2626 int *count
= (int *) data
;
2628 gdb_assert (count
!= NULL
);
2630 /* Count only resumed LWPs that have an event pending. */
2631 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2632 && lp
->status_pending_p
)
2638 /* Select the LWP (if any) that is currently being single-stepped. */
2641 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2643 struct thread_info
*thread
= (struct thread_info
*) entry
;
2644 struct lwp_info
*lp
= get_thread_lwp (thread
);
2646 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2647 && thread
->last_resume_kind
== resume_step
2648 && lp
->status_pending_p
)
2654 /* Select the Nth LWP that has had an event. */
2657 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2659 struct thread_info
*thread
= (struct thread_info
*) entry
;
2660 struct lwp_info
*lp
= get_thread_lwp (thread
);
2661 int *selector
= (int *) data
;
2663 gdb_assert (selector
!= NULL
);
2665 /* Select only resumed LWPs that have an event pending. */
2666 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2667 && lp
->status_pending_p
)
2668 if ((*selector
)-- == 0)
2674 /* Select one LWP out of those that have events pending. */
2677 select_event_lwp (struct lwp_info
**orig_lp
)
2680 int random_selector
;
2681 struct thread_info
*event_thread
= NULL
;
2683 /* In all-stop, give preference to the LWP that is being
2684 single-stepped. There will be at most one, and it's the LWP that
2685 the core is most interested in. If we didn't do this, then we'd
2686 have to handle pending step SIGTRAPs somehow in case the core
2687 later continues the previously-stepped thread, otherwise we'd
2688 report the pending SIGTRAP, and the core, not having stepped the
2689 thread, wouldn't understand what the trap was for, and therefore
2690 would report it to the user as a random signal. */
2694 = (struct thread_info
*) find_inferior (&all_threads
,
2695 select_singlestep_lwp_callback
,
2697 if (event_thread
!= NULL
)
2700 debug_printf ("SEL: Select single-step %s\n",
2701 target_pid_to_str (ptid_of (event_thread
)));
2704 if (event_thread
== NULL
)
2706 /* No single-stepping LWP. Select one at random, out of those
2707 which have had events. */
2709 /* First see how many events we have. */
2710 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2711 gdb_assert (num_events
> 0);
2713 /* Now randomly pick a LWP out of those that have had
2715 random_selector
= (int)
2716 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2718 if (debug_threads
&& num_events
> 1)
2719 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2720 num_events
, random_selector
);
2723 = (struct thread_info
*) find_inferior (&all_threads
,
2724 select_event_lwp_callback
,
2728 if (event_thread
!= NULL
)
2730 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2732 /* Switch the event LWP. */
2733 *orig_lp
= event_lp
;
2737 /* Decrement the suspend count of an LWP. */
2740 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2742 struct thread_info
*thread
= (struct thread_info
*) entry
;
2743 struct lwp_info
*lwp
= get_thread_lwp (thread
);
2745 /* Ignore EXCEPT. */
2749 lwp_suspended_decr (lwp
);
2753 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2757 unsuspend_all_lwps (struct lwp_info
*except
)
2759 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
2762 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
2763 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
2765 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
2766 static ptid_t
linux_wait_1 (ptid_t ptid
,
2767 struct target_waitstatus
*ourstatus
,
2768 int target_options
);
2770 /* Stabilize threads (move out of jump pads).
2772 If a thread is midway collecting a fast tracepoint, we need to
2773 finish the collection and move it out of the jump pad before
2774 reporting the signal.
2776 This avoids recursion while collecting (when a signal arrives
2777 midway, and the signal handler itself collects), which would trash
2778 the trace buffer. In case the user set a breakpoint in a signal
2779 handler, this avoids the backtrace showing the jump pad, etc..
2780 Most importantly, there are certain things we can't do safely if
2781 threads are stopped in a jump pad (or in its callee's). For
2784 - starting a new trace run. A thread still collecting the
2785 previous run, could trash the trace buffer when resumed. The trace
2786 buffer control structures would have been reset but the thread had
2787 no way to tell. The thread could even midway memcpy'ing to the
2788 buffer, which would mean that when resumed, it would clobber the
2789 trace buffer that had been set for a new run.
2791 - we can't rewrite/reuse the jump pads for new tracepoints
2792 safely. Say you do tstart while a thread is stopped midway while
2793 collecting. When the thread is later resumed, it finishes the
2794 collection, and returns to the jump pad, to execute the original
2795 instruction that was under the tracepoint jump at the time the
2796 older run had been started. If the jump pad had been rewritten
2797 since for something else in the new run, the thread would now
2798 execute the wrong / random instructions. */
2801 linux_stabilize_threads (void)
2803 struct thread_info
*saved_thread
;
2804 struct thread_info
*thread_stuck
;
2807 = (struct thread_info
*) find_inferior (&all_threads
,
2808 stuck_in_jump_pad_callback
,
2810 if (thread_stuck
!= NULL
)
2813 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2814 lwpid_of (thread_stuck
));
2818 saved_thread
= current_thread
;
2820 stabilizing_threads
= 1;
2823 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
2825 /* Loop until all are stopped out of the jump pads. */
2826 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
2828 struct target_waitstatus ourstatus
;
2829 struct lwp_info
*lwp
;
2832 /* Note that we go through the full wait even loop. While
2833 moving threads out of jump pad, we need to be able to step
2834 over internal breakpoints and such. */
2835 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2837 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2839 lwp
= get_thread_lwp (current_thread
);
2842 lwp_suspended_inc (lwp
);
2844 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
2845 || current_thread
->last_resume_kind
== resume_stop
)
2847 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
2848 enqueue_one_deferred_signal (lwp
, &wstat
);
2853 find_inferior (&all_threads
, unsuspend_one_lwp
, NULL
);
2855 stabilizing_threads
= 0;
2857 current_thread
= saved_thread
;
2862 = (struct thread_info
*) find_inferior (&all_threads
,
2863 stuck_in_jump_pad_callback
,
2865 if (thread_stuck
!= NULL
)
2866 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
2867 lwpid_of (thread_stuck
));
2871 static void async_file_mark (void);
2873 /* Convenience function that is called when the kernel reports an
2874 event that is not passed out to GDB. */
2877 ignore_event (struct target_waitstatus
*ourstatus
)
2879 /* If we got an event, there may still be others, as a single
2880 SIGCHLD can indicate more than one child stopped. This forces
2881 another target_wait call. */
2884 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2888 /* Wait for process, returns status. */
2891 linux_wait_1 (ptid_t ptid
,
2892 struct target_waitstatus
*ourstatus
, int target_options
)
2895 struct lwp_info
*event_child
;
2898 int step_over_finished
;
2899 int bp_explains_trap
;
2900 int maybe_internal_trap
;
2908 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
2911 /* Translate generic target options into linux options. */
2913 if (target_options
& TARGET_WNOHANG
)
2916 bp_explains_trap
= 0;
2919 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2921 if (ptid_equal (step_over_bkpt
, null_ptid
))
2922 pid
= linux_wait_for_event (ptid
, &w
, options
);
2926 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
2927 target_pid_to_str (step_over_bkpt
));
2928 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
2933 gdb_assert (target_options
& TARGET_WNOHANG
);
2937 debug_printf ("linux_wait_1 ret = null_ptid, "
2938 "TARGET_WAITKIND_IGNORE\n");
2942 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2949 debug_printf ("linux_wait_1 ret = null_ptid, "
2950 "TARGET_WAITKIND_NO_RESUMED\n");
2954 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
2958 event_child
= get_thread_lwp (current_thread
);
2960 /* linux_wait_for_event only returns an exit status for the last
2961 child of a process. Report it. */
2962 if (WIFEXITED (w
) || WIFSIGNALED (w
))
2966 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
2967 ourstatus
->value
.integer
= WEXITSTATUS (w
);
2971 debug_printf ("linux_wait_1 ret = %s, exited with "
2973 target_pid_to_str (ptid_of (current_thread
)),
2980 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
2981 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
2985 debug_printf ("linux_wait_1 ret = %s, terminated with "
2987 target_pid_to_str (ptid_of (current_thread
)),
2993 return ptid_of (current_thread
);
2996 /* If step-over executes a breakpoint instruction, it means a
2997 gdb/gdbserver breakpoint had been planted on top of a permanent
2998 breakpoint. The PC has been adjusted by
2999 check_stopped_by_breakpoint to point at the breakpoint address.
3000 Advance the PC manually past the breakpoint, otherwise the
3001 program would keep trapping the permanent breakpoint forever. */
3002 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3003 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
3005 int increment_pc
= 0;
3006 int breakpoint_kind
= 0;
3007 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3009 breakpoint_kind
= the_target
->breakpoint_kind_from_pc (&stop_pc
);
3010 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3014 debug_printf ("step-over for %s executed software breakpoint\n",
3015 target_pid_to_str (ptid_of (current_thread
)));
3018 if (increment_pc
!= 0)
3020 struct regcache
*regcache
3021 = get_thread_regcache (current_thread
, 1);
3023 event_child
->stop_pc
+= increment_pc
;
3024 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3026 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3027 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3031 /* If this event was not handled before, and is not a SIGTRAP, we
3032 report it. SIGILL and SIGSEGV are also treated as traps in case
3033 a breakpoint is inserted at the current PC. If this target does
3034 not support internal breakpoints at all, we also report the
3035 SIGTRAP without further processing; it's of no concern to us. */
3037 = (supports_breakpoints ()
3038 && (WSTOPSIG (w
) == SIGTRAP
3039 || ((WSTOPSIG (w
) == SIGILL
3040 || WSTOPSIG (w
) == SIGSEGV
)
3041 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3043 if (maybe_internal_trap
)
3045 /* Handle anything that requires bookkeeping before deciding to
3046 report the event or continue waiting. */
3048 /* First check if we can explain the SIGTRAP with an internal
3049 breakpoint, or if we should possibly report the event to GDB.
3050 Do this before anything that may remove or insert a
3052 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3054 /* We have a SIGTRAP, possibly a step-over dance has just
3055 finished. If so, tweak the state machine accordingly,
3056 reinsert breakpoints and delete any reinsert (software
3057 single-step) breakpoints. */
3058 step_over_finished
= finish_step_over (event_child
);
3060 /* Now invoke the callbacks of any internal breakpoints there. */
3061 check_breakpoints (event_child
->stop_pc
);
3063 /* Handle tracepoint data collecting. This may overflow the
3064 trace buffer, and cause a tracing stop, removing
3066 trace_event
= handle_tracepoints (event_child
);
3068 if (bp_explains_trap
)
3070 /* If we stepped or ran into an internal breakpoint, we've
3071 already handled it. So next time we resume (from this
3072 PC), we should step over it. */
3074 debug_printf ("Hit a gdbserver breakpoint.\n");
3076 if (breakpoint_here (event_child
->stop_pc
))
3077 event_child
->need_step_over
= 1;
3082 /* We have some other signal, possibly a step-over dance was in
3083 progress, and it should be cancelled too. */
3084 step_over_finished
= finish_step_over (event_child
);
3087 /* We have all the data we need. Either report the event to GDB, or
3088 resume threads and keep waiting for more. */
3090 /* If we're collecting a fast tracepoint, finish the collection and
3091 move out of the jump pad before delivering a signal. See
3092 linux_stabilize_threads. */
3095 && WSTOPSIG (w
) != SIGTRAP
3096 && supports_fast_tracepoints ()
3097 && agent_loaded_p ())
3100 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3101 "to defer or adjust it.\n",
3102 WSTOPSIG (w
), lwpid_of (current_thread
));
3104 /* Allow debugging the jump pad itself. */
3105 if (current_thread
->last_resume_kind
!= resume_step
3106 && maybe_move_out_of_jump_pad (event_child
, &w
))
3108 enqueue_one_deferred_signal (event_child
, &w
);
3111 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3112 WSTOPSIG (w
), lwpid_of (current_thread
));
3114 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3116 return ignore_event (ourstatus
);
3120 if (event_child
->collecting_fast_tracepoint
)
3123 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3124 "Check if we're already there.\n",
3125 lwpid_of (current_thread
),
3126 event_child
->collecting_fast_tracepoint
);
3130 event_child
->collecting_fast_tracepoint
3131 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3133 if (event_child
->collecting_fast_tracepoint
!= 1)
3135 /* No longer need this breakpoint. */
3136 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3139 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3140 "stopping all threads momentarily.\n");
3142 /* Other running threads could hit this breakpoint.
3143 We don't handle moribund locations like GDB does,
3144 instead we always pause all threads when removing
3145 breakpoints, so that any step-over or
3146 decr_pc_after_break adjustment is always taken
3147 care of while the breakpoint is still
3149 stop_all_lwps (1, event_child
);
3151 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3152 event_child
->exit_jump_pad_bkpt
= NULL
;
3154 unstop_all_lwps (1, event_child
);
3156 gdb_assert (event_child
->suspended
>= 0);
3160 if (event_child
->collecting_fast_tracepoint
== 0)
3163 debug_printf ("fast tracepoint finished "
3164 "collecting successfully.\n");
3166 /* We may have a deferred signal to report. */
3167 if (dequeue_one_deferred_signal (event_child
, &w
))
3170 debug_printf ("dequeued one signal.\n");
3175 debug_printf ("no deferred signals.\n");
3177 if (stabilizing_threads
)
3179 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3180 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3184 debug_printf ("linux_wait_1 ret = %s, stopped "
3185 "while stabilizing threads\n",
3186 target_pid_to_str (ptid_of (current_thread
)));
3190 return ptid_of (current_thread
);
3196 /* Check whether GDB would be interested in this event. */
3198 /* If GDB is not interested in this signal, don't stop other
3199 threads, and don't report it to GDB. Just resume the inferior
3200 right away. We do this for threading-related signals as well as
3201 any that GDB specifically requested we ignore. But never ignore
3202 SIGSTOP if we sent it ourselves, and do not ignore signals when
3203 stepping - they may require special handling to skip the signal
3204 handler. Also never ignore signals that could be caused by a
3206 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
3209 && current_thread
->last_resume_kind
!= resume_step
3211 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3212 (current_process ()->priv
->thread_db
!= NULL
3213 && (WSTOPSIG (w
) == __SIGRTMIN
3214 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3217 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3218 && !(WSTOPSIG (w
) == SIGSTOP
3219 && current_thread
->last_resume_kind
== resume_stop
)
3220 && !linux_wstatus_maybe_breakpoint (w
))))
3222 siginfo_t info
, *info_p
;
3225 debug_printf ("Ignored signal %d for LWP %ld.\n",
3226 WSTOPSIG (w
), lwpid_of (current_thread
));
3228 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3229 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3234 if (step_over_finished
)
3236 /* We cancelled this thread's step-over above. We still
3237 need to unsuspend all other LWPs, and set them back
3238 running again while the signal handler runs. */
3239 unsuspend_all_lwps (event_child
);
3241 /* Enqueue the pending signal info so that proceed_all_lwps
3243 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3245 proceed_all_lwps ();
3249 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3250 WSTOPSIG (w
), info_p
);
3252 return ignore_event (ourstatus
);
3255 /* Note that all addresses are always "out of the step range" when
3256 there's no range to begin with. */
3257 in_step_range
= lwp_in_step_range (event_child
);
3259 /* If GDB wanted this thread to single step, and the thread is out
3260 of the step range, we always want to report the SIGTRAP, and let
3261 GDB handle it. Watchpoints should always be reported. So should
3262 signals we can't explain. A SIGTRAP we can't explain could be a
3263 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3264 do, we're be able to handle GDB breakpoints on top of internal
3265 breakpoints, by handling the internal breakpoint and still
3266 reporting the event to GDB. If we don't, we're out of luck, GDB
3267 won't see the breakpoint hit. If we see a single-step event but
3268 the thread should be continuing, don't pass the trap to gdb.
3269 That indicates that we had previously finished a single-step but
3270 left the single-step pending -- see
3271 complete_ongoing_step_over. */
3272 report_to_gdb
= (!maybe_internal_trap
3273 || (current_thread
->last_resume_kind
== resume_step
3275 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3277 && !bp_explains_trap
3279 && !step_over_finished
3280 && !(current_thread
->last_resume_kind
== resume_continue
3281 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3282 || (gdb_breakpoint_here (event_child
->stop_pc
)
3283 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3284 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3285 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3287 run_breakpoint_commands (event_child
->stop_pc
);
3289 /* We found no reason GDB would want us to stop. We either hit one
3290 of our own breakpoints, or finished an internal step GDB
3291 shouldn't know about. */
3296 if (bp_explains_trap
)
3297 debug_printf ("Hit a gdbserver breakpoint.\n");
3298 if (step_over_finished
)
3299 debug_printf ("Step-over finished.\n");
3301 debug_printf ("Tracepoint event.\n");
3302 if (lwp_in_step_range (event_child
))
3303 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3304 paddress (event_child
->stop_pc
),
3305 paddress (event_child
->step_range_start
),
3306 paddress (event_child
->step_range_end
));
3309 /* We're not reporting this breakpoint to GDB, so apply the
3310 decr_pc_after_break adjustment to the inferior's regcache
3313 if (the_low_target
.set_pc
!= NULL
)
3315 struct regcache
*regcache
3316 = get_thread_regcache (current_thread
, 1);
3317 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3320 /* We may have finished stepping over a breakpoint. If so,
3321 we've stopped and suspended all LWPs momentarily except the
3322 stepping one. This is where we resume them all again. We're
3323 going to keep waiting, so use proceed, which handles stepping
3324 over the next breakpoint. */
3326 debug_printf ("proceeding all threads.\n");
3328 if (step_over_finished
)
3329 unsuspend_all_lwps (event_child
);
3331 proceed_all_lwps ();
3332 return ignore_event (ourstatus
);
3337 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3341 str
= target_waitstatus_to_string (&event_child
->waitstatus
);
3342 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3343 lwpid_of (get_lwp_thread (event_child
)), str
);
3346 if (current_thread
->last_resume_kind
== resume_step
)
3348 if (event_child
->step_range_start
== event_child
->step_range_end
)
3349 debug_printf ("GDB wanted to single-step, reporting event.\n");
3350 else if (!lwp_in_step_range (event_child
))
3351 debug_printf ("Out of step range, reporting event.\n");
3353 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3354 debug_printf ("Stopped by watchpoint.\n");
3355 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3356 debug_printf ("Stopped by GDB breakpoint.\n");
3358 debug_printf ("Hit a non-gdbserver trap event.\n");
3361 /* Alright, we're going to report a stop. */
3363 if (!stabilizing_threads
)
3365 /* In all-stop, stop all threads. */
3367 stop_all_lwps (0, NULL
);
3369 /* If we're not waiting for a specific LWP, choose an event LWP
3370 from among those that have had events. Giving equal priority
3371 to all LWPs that have had events helps prevent
3373 if (ptid_equal (ptid
, minus_one_ptid
))
3375 event_child
->status_pending_p
= 1;
3376 event_child
->status_pending
= w
;
3378 select_event_lwp (&event_child
);
3380 /* current_thread and event_child must stay in sync. */
3381 current_thread
= get_lwp_thread (event_child
);
3383 event_child
->status_pending_p
= 0;
3384 w
= event_child
->status_pending
;
3387 if (step_over_finished
)
3391 /* If we were doing a step-over, all other threads but
3392 the stepping one had been paused in start_step_over,
3393 with their suspend counts incremented. We don't want
3394 to do a full unstop/unpause, because we're in
3395 all-stop mode (so we want threads stopped), but we
3396 still need to unsuspend the other threads, to
3397 decrement their `suspended' count back. */
3398 unsuspend_all_lwps (event_child
);
3402 /* If we just finished a step-over, then all threads had
3403 been momentarily paused. In all-stop, that's fine,
3404 we want threads stopped by now anyway. In non-stop,
3405 we need to re-resume threads that GDB wanted to be
3407 unstop_all_lwps (1, event_child
);
3411 /* Stabilize threads (move out of jump pads). */
3413 stabilize_threads ();
3417 /* If we just finished a step-over, then all threads had been
3418 momentarily paused. In all-stop, that's fine, we want
3419 threads stopped by now anyway. In non-stop, we need to
3420 re-resume threads that GDB wanted to be running. */
3421 if (step_over_finished
)
3422 unstop_all_lwps (1, event_child
);
3425 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3427 /* If the reported event is an exit, fork, vfork or exec, let
3429 *ourstatus
= event_child
->waitstatus
;
3430 /* Clear the event lwp's waitstatus since we handled it already. */
3431 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3434 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3436 /* Now that we've selected our final event LWP, un-adjust its PC if
3437 it was a software breakpoint, and the client doesn't know we can
3438 adjust the breakpoint ourselves. */
3439 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3440 && !swbreak_feature
)
3442 int decr_pc
= the_low_target
.decr_pc_after_break
;
3446 struct regcache
*regcache
3447 = get_thread_regcache (current_thread
, 1);
3448 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3452 if (current_thread
->last_resume_kind
== resume_stop
3453 && WSTOPSIG (w
) == SIGSTOP
)
3455 /* A thread that has been requested to stop by GDB with vCont;t,
3456 and it stopped cleanly, so report as SIG0. The use of
3457 SIGSTOP is an implementation detail. */
3458 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3460 else if (current_thread
->last_resume_kind
== resume_stop
3461 && WSTOPSIG (w
) != SIGSTOP
)
3463 /* A thread that has been requested to stop by GDB with vCont;t,
3464 but, it stopped for other reasons. */
3465 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3467 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3469 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3472 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3476 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3477 target_pid_to_str (ptid_of (current_thread
)),
3478 ourstatus
->kind
, ourstatus
->value
.sig
);
3482 return ptid_of (current_thread
);
3485 /* Get rid of any pending event in the pipe. */
3487 async_file_flush (void)
3493 ret
= read (linux_event_pipe
[0], &buf
, 1);
3494 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3497 /* Put something in the pipe, so the event loop wakes up. */
3499 async_file_mark (void)
3503 async_file_flush ();
3506 ret
= write (linux_event_pipe
[1], "+", 1);
3507 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3509 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3510 be awakened anyway. */
3514 linux_wait (ptid_t ptid
,
3515 struct target_waitstatus
*ourstatus
, int target_options
)
3519 /* Flush the async file first. */
3520 if (target_is_async_p ())
3521 async_file_flush ();
3525 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3527 while ((target_options
& TARGET_WNOHANG
) == 0
3528 && ptid_equal (event_ptid
, null_ptid
)
3529 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3531 /* If at least one stop was reported, there may be more. A single
3532 SIGCHLD can signal more than one child stop. */
3533 if (target_is_async_p ()
3534 && (target_options
& TARGET_WNOHANG
) != 0
3535 && !ptid_equal (event_ptid
, null_ptid
))
3541 /* Send a signal to an LWP. */
3544 kill_lwp (unsigned long lwpid
, int signo
)
3546 /* Use tkill, if possible, in case we are using nptl threads. If tkill
3547 fails, then we are not using nptl threads and we should be using kill. */
3551 static int tkill_failed
;
3558 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3559 if (errno
!= ENOSYS
)
3566 return kill (lwpid
, signo
);
3570 linux_stop_lwp (struct lwp_info
*lwp
)
3576 send_sigstop (struct lwp_info
*lwp
)
3580 pid
= lwpid_of (get_lwp_thread (lwp
));
3582 /* If we already have a pending stop signal for this process, don't
3584 if (lwp
->stop_expected
)
3587 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3593 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3595 lwp
->stop_expected
= 1;
3596 kill_lwp (pid
, SIGSTOP
);
3600 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
3602 struct thread_info
*thread
= (struct thread_info
*) entry
;
3603 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3605 /* Ignore EXCEPT. */
3616 /* Increment the suspend count of an LWP, and stop it, if not stopped
3619 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
3622 struct thread_info
*thread
= (struct thread_info
*) entry
;
3623 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3625 /* Ignore EXCEPT. */
3629 lwp_suspended_inc (lwp
);
3631 return send_sigstop_callback (entry
, except
);
3635 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3637 /* Store the exit status for later. */
3638 lwp
->status_pending_p
= 1;
3639 lwp
->status_pending
= wstat
;
3641 /* Store in waitstatus as well, as there's nothing else to process
3643 if (WIFEXITED (wstat
))
3645 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
3646 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
3648 else if (WIFSIGNALED (wstat
))
3650 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
3651 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
3654 /* Prevent trying to stop it. */
3657 /* No further stops are expected from a dead lwp. */
3658 lwp
->stop_expected
= 0;
3661 /* Return true if LWP has exited already, and has a pending exit event
3662 to report to GDB. */
3665 lwp_is_marked_dead (struct lwp_info
*lwp
)
3667 return (lwp
->status_pending_p
3668 && (WIFEXITED (lwp
->status_pending
)
3669 || WIFSIGNALED (lwp
->status_pending
)));
3672 /* Wait for all children to stop for the SIGSTOPs we just queued. */
3675 wait_for_sigstop (void)
3677 struct thread_info
*saved_thread
;
3682 saved_thread
= current_thread
;
3683 if (saved_thread
!= NULL
)
3684 saved_tid
= saved_thread
->entry
.id
;
3686 saved_tid
= null_ptid
; /* avoid bogus unused warning */
3689 debug_printf ("wait_for_sigstop: pulling events\n");
3691 /* Passing NULL_PTID as filter indicates we want all events to be
3692 left pending. Eventually this returns when there are no
3693 unwaited-for children left. */
3694 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
3696 gdb_assert (ret
== -1);
3698 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
3699 current_thread
= saved_thread
;
3703 debug_printf ("Previously current thread died.\n");
3705 /* We can't change the current inferior behind GDB's back,
3706 otherwise, a subsequent command may apply to the wrong
3708 current_thread
= NULL
;
3712 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
3713 move it out, because we need to report the stop event to GDB. For
3714 example, if the user puts a breakpoint in the jump pad, it's
3715 because she wants to debug it. */
3718 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
3720 struct thread_info
*thread
= (struct thread_info
*) entry
;
3721 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3723 if (lwp
->suspended
!= 0)
3725 internal_error (__FILE__
, __LINE__
,
3726 "LWP %ld is suspended, suspended=%d\n",
3727 lwpid_of (thread
), lwp
->suspended
);
3729 gdb_assert (lwp
->stopped
);
3731 /* Allow debugging the jump pad, gdb_collect, etc.. */
3732 return (supports_fast_tracepoints ()
3733 && agent_loaded_p ()
3734 && (gdb_breakpoint_here (lwp
->stop_pc
)
3735 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3736 || thread
->last_resume_kind
== resume_step
)
3737 && linux_fast_tracepoint_collecting (lwp
, NULL
));
3741 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
3743 struct thread_info
*thread
= (struct thread_info
*) entry
;
3744 struct thread_info
*saved_thread
;
3745 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3748 if (lwp
->suspended
!= 0)
3750 internal_error (__FILE__
, __LINE__
,
3751 "LWP %ld is suspended, suspended=%d\n",
3752 lwpid_of (thread
), lwp
->suspended
);
3754 gdb_assert (lwp
->stopped
);
3756 /* For gdb_breakpoint_here. */
3757 saved_thread
= current_thread
;
3758 current_thread
= thread
;
3760 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
3762 /* Allow debugging the jump pad, gdb_collect, etc. */
3763 if (!gdb_breakpoint_here (lwp
->stop_pc
)
3764 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
3765 && thread
->last_resume_kind
!= resume_step
3766 && maybe_move_out_of_jump_pad (lwp
, wstat
))
3769 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
3774 lwp
->status_pending_p
= 0;
3775 enqueue_one_deferred_signal (lwp
, wstat
);
3778 debug_printf ("Signal %d for LWP %ld deferred "
3780 WSTOPSIG (*wstat
), lwpid_of (thread
));
3783 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
3786 lwp_suspended_inc (lwp
);
3788 current_thread
= saved_thread
;
3792 lwp_running (struct inferior_list_entry
*entry
, void *data
)
3794 struct thread_info
*thread
= (struct thread_info
*) entry
;
3795 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3797 if (lwp_is_marked_dead (lwp
))
3804 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
3805 If SUSPEND, then also increase the suspend count of every LWP,
3809 stop_all_lwps (int suspend
, struct lwp_info
*except
)
3811 /* Should not be called recursively. */
3812 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
3817 debug_printf ("stop_all_lwps (%s, except=%s)\n",
3818 suspend
? "stop-and-suspend" : "stop",
3820 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
3824 stopping_threads
= (suspend
3825 ? STOPPING_AND_SUSPENDING_THREADS
3826 : STOPPING_THREADS
);
3829 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
3831 find_inferior (&all_threads
, send_sigstop_callback
, except
);
3832 wait_for_sigstop ();
3833 stopping_threads
= NOT_STOPPING_THREADS
;
3837 debug_printf ("stop_all_lwps done, setting stopping_threads "
3838 "back to !stopping\n");
3843 /* Enqueue one signal in the chain of signals which need to be
3844 delivered to this process on next resume. */
3847 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
3849 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
3851 p_sig
->prev
= lwp
->pending_signals
;
3852 p_sig
->signal
= signal
;
3854 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3856 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3857 lwp
->pending_signals
= p_sig
;
3860 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
3861 SIGNAL is nonzero, give it that signal. */
3864 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
3865 int step
, int signal
, siginfo_t
*info
)
3867 struct thread_info
*thread
= get_lwp_thread (lwp
);
3868 struct thread_info
*saved_thread
;
3869 int fast_tp_collecting
;
3870 struct process_info
*proc
= get_thread_process (thread
);
3872 /* Note that target description may not be initialised
3873 (proc->tdesc == NULL) at this point because the program hasn't
3874 stopped at the first instruction yet. It means GDBserver skips
3875 the extra traps from the wrapper program (see option --wrapper).
3876 Code in this function that requires register access should be
3877 guarded by proc->tdesc == NULL or something else. */
3879 if (lwp
->stopped
== 0)
3882 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
3884 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
3886 /* Cancel actions that rely on GDB not changing the PC (e.g., the
3887 user used the "jump" command, or "set $pc = foo"). */
3888 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
3890 /* Collecting 'while-stepping' actions doesn't make sense
3892 release_while_stepping_state_list (thread
);
3895 /* If we have pending signals or status, and a new signal, enqueue the
3896 signal. Also enqueue the signal if we are waiting to reinsert a
3897 breakpoint; it will be picked up again below. */
3899 && (lwp
->status_pending_p
3900 || lwp
->pending_signals
!= NULL
3901 || lwp
->bp_reinsert
!= 0
3902 || fast_tp_collecting
))
3904 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
3906 p_sig
->prev
= lwp
->pending_signals
;
3907 p_sig
->signal
= signal
;
3909 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3911 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3912 lwp
->pending_signals
= p_sig
;
3915 if (lwp
->status_pending_p
)
3918 debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);"
3919 " has pending status\n",
3920 lwpid_of (thread
), step
? "step" : "continue", signal
,
3921 lwp
->stop_expected
? "expected" : "not expected");
3925 saved_thread
= current_thread
;
3926 current_thread
= thread
;
3929 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
3930 lwpid_of (thread
), step
? "step" : "continue", signal
,
3931 lwp
->stop_expected
? "expected" : "not expected");
3933 /* This bit needs some thinking about. If we get a signal that
3934 we must report while a single-step reinsert is still pending,
3935 we often end up resuming the thread. It might be better to
3936 (ew) allow a stack of pending events; then we could be sure that
3937 the reinsert happened right away and not lose any signals.
3939 Making this stack would also shrink the window in which breakpoints are
3940 uninserted (see comment in linux_wait_for_lwp) but not enough for
3941 complete correctness, so it won't solve that problem. It may be
3942 worthwhile just to solve this one, however. */
3943 if (lwp
->bp_reinsert
!= 0)
3946 debug_printf (" pending reinsert at 0x%s\n",
3947 paddress (lwp
->bp_reinsert
));
3949 if (can_hardware_single_step ())
3951 if (fast_tp_collecting
== 0)
3954 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
3956 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
3963 /* Postpone any pending signal. It was enqueued above. */
3967 if (fast_tp_collecting
== 1)
3970 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3971 " (exit-jump-pad-bkpt)\n",
3974 /* Postpone any pending signal. It was enqueued above. */
3977 else if (fast_tp_collecting
== 2)
3980 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3981 " single-stepping\n",
3984 if (can_hardware_single_step ())
3988 internal_error (__FILE__
, __LINE__
,
3989 "moving out of jump pad single-stepping"
3990 " not implemented on this target");
3993 /* Postpone any pending signal. It was enqueued above. */
3997 /* If we have while-stepping actions in this thread set it stepping.
3998 If we have a signal to deliver, it may or may not be set to
3999 SIG_IGN, we don't know. Assume so, and allow collecting
4000 while-stepping into a signal handler. A possible smart thing to
4001 do would be to set an internal breakpoint at the signal return
4002 address, continue, and carry on catching this while-stepping
4003 action only when that breakpoint is hit. A future
4005 if (thread
->while_stepping
!= NULL
4006 && can_hardware_single_step ())
4009 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4014 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4016 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4018 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4022 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4023 (long) lwp
->stop_pc
);
4027 /* If we have pending signals, consume one unless we are trying to
4028 reinsert a breakpoint or we're trying to finish a fast tracepoint
4030 if (lwp
->pending_signals
!= NULL
4031 && lwp
->bp_reinsert
== 0
4032 && fast_tp_collecting
== 0)
4034 struct pending_signals
**p_sig
;
4036 p_sig
= &lwp
->pending_signals
;
4037 while ((*p_sig
)->prev
!= NULL
)
4038 p_sig
= &(*p_sig
)->prev
;
4040 signal
= (*p_sig
)->signal
;
4041 if ((*p_sig
)->info
.si_signo
!= 0)
4042 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4049 if (the_low_target
.prepare_to_resume
!= NULL
)
4050 the_low_target
.prepare_to_resume (lwp
);
4052 regcache_invalidate_thread (thread
);
4054 lwp
->stepping
= step
;
4055 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (thread
),
4056 (PTRACE_TYPE_ARG3
) 0,
4057 /* Coerce to a uintptr_t first to avoid potential gcc warning
4058 of coercing an 8 byte integer to a 4 byte pointer. */
4059 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4061 current_thread
= saved_thread
;
4063 perror_with_name ("resuming thread");
4065 /* Successfully resumed. Clear state that no longer makes sense,
4066 and mark the LWP as running. Must not do this before resuming
4067 otherwise if that fails other code will be confused. E.g., we'd
4068 later try to stop the LWP and hang forever waiting for a stop
4069 status. Note that we must not throw after this is cleared,
4070 otherwise handle_zombie_lwp_error would get confused. */
4072 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4075 /* Called when we try to resume a stopped LWP and that errors out. If
4076 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4077 or about to become), discard the error, clear any pending status
4078 the LWP may have, and return true (we'll collect the exit status
4079 soon enough). Otherwise, return false. */
4082 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4084 struct thread_info
*thread
= get_lwp_thread (lp
);
4086 /* If we get an error after resuming the LWP successfully, we'd
4087 confuse !T state for the LWP being gone. */
4088 gdb_assert (lp
->stopped
);
4090 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4091 because even if ptrace failed with ESRCH, the tracee may be "not
4092 yet fully dead", but already refusing ptrace requests. In that
4093 case the tracee has 'R (Running)' state for a little bit
4094 (observed in Linux 3.18). See also the note on ESRCH in the
4095 ptrace(2) man page. Instead, check whether the LWP has any state
4096 other than ptrace-stopped. */
4098 /* Don't assume anything if /proc/PID/status can't be read. */
4099 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4101 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4102 lp
->status_pending_p
= 0;
4108 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4109 disappears while we try to resume it. */
4112 linux_resume_one_lwp (struct lwp_info
*lwp
,
4113 int step
, int signal
, siginfo_t
*info
)
4117 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4119 CATCH (ex
, RETURN_MASK_ERROR
)
4121 if (!check_ptrace_stopped_lwp_gone (lwp
))
4122 throw_exception (ex
);
4127 struct thread_resume_array
4129 struct thread_resume
*resume
;
4133 /* This function is called once per thread via find_inferior.
4134 ARG is a pointer to a thread_resume_array struct.
4135 We look up the thread specified by ENTRY in ARG, and mark the thread
4136 with a pointer to the appropriate resume request.
4138 This algorithm is O(threads * resume elements), but resume elements
4139 is small (and will remain small at least until GDB supports thread
4143 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
4145 struct thread_info
*thread
= (struct thread_info
*) entry
;
4146 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4148 struct thread_resume_array
*r
;
4150 r
= (struct thread_resume_array
*) arg
;
4152 for (ndx
= 0; ndx
< r
->n
; ndx
++)
4154 ptid_t ptid
= r
->resume
[ndx
].thread
;
4155 if (ptid_equal (ptid
, minus_one_ptid
)
4156 || ptid_equal (ptid
, entry
->id
)
4157 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4159 || (ptid_get_pid (ptid
) == pid_of (thread
)
4160 && (ptid_is_pid (ptid
)
4161 || ptid_get_lwp (ptid
) == -1)))
4163 if (r
->resume
[ndx
].kind
== resume_stop
4164 && thread
->last_resume_kind
== resume_stop
)
4167 debug_printf ("already %s LWP %ld at GDB's request\n",
4168 (thread
->last_status
.kind
4169 == TARGET_WAITKIND_STOPPED
)
4177 lwp
->resume
= &r
->resume
[ndx
];
4178 thread
->last_resume_kind
= lwp
->resume
->kind
;
4180 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4181 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4183 /* If we had a deferred signal to report, dequeue one now.
4184 This can happen if LWP gets more than one signal while
4185 trying to get out of a jump pad. */
4187 && !lwp
->status_pending_p
4188 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4190 lwp
->status_pending_p
= 1;
4193 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4194 "leaving status pending.\n",
4195 WSTOPSIG (lwp
->status_pending
),
4203 /* No resume action for this thread. */
4209 /* find_inferior callback for linux_resume.
4210 Set *FLAG_P if this lwp has an interesting status pending. */
4213 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
4215 struct thread_info
*thread
= (struct thread_info
*) entry
;
4216 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4218 /* LWPs which will not be resumed are not interesting, because
4219 we might not wait for them next time through linux_wait. */
4220 if (lwp
->resume
== NULL
)
4223 if (thread_still_has_status_pending_p (thread
))
4224 * (int *) flag_p
= 1;
4229 /* Return 1 if this lwp that GDB wants running is stopped at an
4230 internal breakpoint that we need to step over. It assumes that any
4231 required STOP_PC adjustment has already been propagated to the
4232 inferior's regcache. */
4235 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
4237 struct thread_info
*thread
= (struct thread_info
*) entry
;
4238 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4239 struct thread_info
*saved_thread
;
4241 struct process_info
*proc
= get_thread_process (thread
);
4243 /* GDBserver is skipping the extra traps from the wrapper program,
4244 don't have to do step over. */
4245 if (proc
->tdesc
== NULL
)
4248 /* LWPs which will not be resumed are not interesting, because we
4249 might not wait for them next time through linux_wait. */
4254 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4259 if (thread
->last_resume_kind
== resume_stop
)
4262 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4268 gdb_assert (lwp
->suspended
>= 0);
4273 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4278 if (!lwp
->need_step_over
)
4281 debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread
));
4284 if (lwp
->status_pending_p
)
4287 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4293 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4297 /* If the PC has changed since we stopped, then don't do anything,
4298 and let the breakpoint/tracepoint be hit. This happens if, for
4299 instance, GDB handled the decr_pc_after_break subtraction itself,
4300 GDB is OOL stepping this thread, or the user has issued a "jump"
4301 command, or poked thread's registers herself. */
4302 if (pc
!= lwp
->stop_pc
)
4305 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4306 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4308 paddress (lwp
->stop_pc
), paddress (pc
));
4310 lwp
->need_step_over
= 0;
4314 saved_thread
= current_thread
;
4315 current_thread
= thread
;
4317 /* We can only step over breakpoints we know about. */
4318 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4320 /* Don't step over a breakpoint that GDB expects to hit
4321 though. If the condition is being evaluated on the target's side
4322 and it evaluate to false, step over this breakpoint as well. */
4323 if (gdb_breakpoint_here (pc
)
4324 && gdb_condition_true_at_breakpoint (pc
)
4325 && gdb_no_commands_at_breakpoint (pc
))
4328 debug_printf ("Need step over [LWP %ld]? yes, but found"
4329 " GDB breakpoint at 0x%s; skipping step over\n",
4330 lwpid_of (thread
), paddress (pc
));
4332 current_thread
= saved_thread
;
4338 debug_printf ("Need step over [LWP %ld]? yes, "
4339 "found breakpoint at 0x%s\n",
4340 lwpid_of (thread
), paddress (pc
));
4342 /* We've found an lwp that needs stepping over --- return 1 so
4343 that find_inferior stops looking. */
4344 current_thread
= saved_thread
;
4346 /* If the step over is cancelled, this is set again. */
4347 lwp
->need_step_over
= 0;
4352 current_thread
= saved_thread
;
4355 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4357 lwpid_of (thread
), paddress (pc
));
4362 /* Start a step-over operation on LWP. When LWP stopped at a
4363 breakpoint, to make progress, we need to remove the breakpoint out
4364 of the way. If we let other threads run while we do that, they may
4365 pass by the breakpoint location and miss hitting it. To avoid
4366 that, a step-over momentarily stops all threads while LWP is
4367 single-stepped while the breakpoint is temporarily uninserted from
4368 the inferior. When the single-step finishes, we reinsert the
4369 breakpoint, and let all threads that are supposed to be running,
4372 On targets that don't support hardware single-step, we don't
4373 currently support full software single-stepping. Instead, we only
4374 support stepping over the thread event breakpoint, by asking the
4375 low target where to place a reinsert breakpoint. Since this
4376 routine assumes the breakpoint being stepped over is a thread event
4377 breakpoint, it usually assumes the return address of the current
4378 function is a good enough place to set the reinsert breakpoint. */
4381 start_step_over (struct lwp_info
*lwp
)
4383 struct thread_info
*thread
= get_lwp_thread (lwp
);
4384 struct thread_info
*saved_thread
;
4389 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4392 stop_all_lwps (1, lwp
);
4394 if (lwp
->suspended
!= 0)
4396 internal_error (__FILE__
, __LINE__
,
4397 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4402 debug_printf ("Done stopping all threads for step-over.\n");
4404 /* Note, we should always reach here with an already adjusted PC,
4405 either by GDB (if we're resuming due to GDB's request), or by our
4406 caller, if we just finished handling an internal breakpoint GDB
4407 shouldn't care about. */
4410 saved_thread
= current_thread
;
4411 current_thread
= thread
;
4413 lwp
->bp_reinsert
= pc
;
4414 uninsert_breakpoints_at (pc
);
4415 uninsert_fast_tracepoint_jumps_at (pc
);
4417 if (can_hardware_single_step ())
4423 CORE_ADDR raddr
= (*the_low_target
.breakpoint_reinsert_addr
) ();
4424 set_reinsert_breakpoint (raddr
);
4428 current_thread
= saved_thread
;
4430 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4432 /* Require next event from this LWP. */
4433 step_over_bkpt
= thread
->entry
.id
;
4437 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4438 start_step_over, if still there, and delete any reinsert
4439 breakpoints we've set, on non hardware single-step targets. */
4442 finish_step_over (struct lwp_info
*lwp
)
4444 if (lwp
->bp_reinsert
!= 0)
4447 debug_printf ("Finished step over.\n");
4449 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4450 may be no breakpoint to reinsert there by now. */
4451 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4452 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4454 lwp
->bp_reinsert
= 0;
4456 /* Delete any software-single-step reinsert breakpoints. No
4457 longer needed. We don't have to worry about other threads
4458 hitting this trap, and later not being able to explain it,
4459 because we were stepping over a breakpoint, and we hold all
4460 threads but LWP stopped while doing that. */
4461 if (!can_hardware_single_step ())
4462 delete_reinsert_breakpoints ();
4464 step_over_bkpt
= null_ptid
;
4471 /* If there's a step over in progress, wait until all threads stop
4472 (that is, until the stepping thread finishes its step), and
4473 unsuspend all lwps. The stepping thread ends with its status
4474 pending, which is processed later when we get back to processing
4478 complete_ongoing_step_over (void)
4480 if (!ptid_equal (step_over_bkpt
, null_ptid
))
4482 struct lwp_info
*lwp
;
4487 debug_printf ("detach: step over in progress, finish it first\n");
4489 /* Passing NULL_PTID as filter indicates we want all events to
4490 be left pending. Eventually this returns when there are no
4491 unwaited-for children left. */
4492 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4494 gdb_assert (ret
== -1);
4496 lwp
= find_lwp_pid (step_over_bkpt
);
4498 finish_step_over (lwp
);
4499 step_over_bkpt
= null_ptid
;
4500 unsuspend_all_lwps (lwp
);
4504 /* This function is called once per thread. We check the thread's resume
4505 request, which will tell us whether to resume, step, or leave the thread
4506 stopped; and what signal, if any, it should be sent.
4508 For threads which we aren't explicitly told otherwise, we preserve
4509 the stepping flag; this is used for stepping over gdbserver-placed
4512 If pending_flags was set in any thread, we queue any needed
4513 signals, since we won't actually resume. We already have a pending
4514 event to report, so we don't need to preserve any step requests;
4515 they should be re-issued if necessary. */
4518 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
4520 struct thread_info
*thread
= (struct thread_info
*) entry
;
4521 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4523 int leave_all_stopped
= * (int *) arg
;
4526 if (lwp
->resume
== NULL
)
4529 if (lwp
->resume
->kind
== resume_stop
)
4532 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4537 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
4539 /* Stop the thread, and wait for the event asynchronously,
4540 through the event loop. */
4546 debug_printf ("already stopped LWP %ld\n",
4549 /* The LWP may have been stopped in an internal event that
4550 was not meant to be notified back to GDB (e.g., gdbserver
4551 breakpoint), so we should be reporting a stop event in
4554 /* If the thread already has a pending SIGSTOP, this is a
4555 no-op. Otherwise, something later will presumably resume
4556 the thread and this will cause it to cancel any pending
4557 operation, due to last_resume_kind == resume_stop. If
4558 the thread already has a pending status to report, we
4559 will still report it the next time we wait - see
4560 status_pending_p_callback. */
4562 /* If we already have a pending signal to report, then
4563 there's no need to queue a SIGSTOP, as this means we're
4564 midway through moving the LWP out of the jumppad, and we
4565 will report the pending signal as soon as that is
4567 if (lwp
->pending_signals_to_report
== NULL
)
4571 /* For stop requests, we're done. */
4573 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4577 /* If this thread which is about to be resumed has a pending status,
4578 then don't resume it - we can just report the pending status.
4579 Likewise if it is suspended, because e.g., another thread is
4580 stepping past a breakpoint. Make sure to queue any signals that
4581 would otherwise be sent. In all-stop mode, we do this decision
4582 based on if *any* thread has a pending status. If there's a
4583 thread that needs the step-over-breakpoint dance, then don't
4584 resume any other thread but that particular one. */
4585 leave_pending
= (lwp
->suspended
4586 || lwp
->status_pending_p
4587 || leave_all_stopped
);
4592 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
4594 step
= (lwp
->resume
->kind
== resume_step
);
4595 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
4600 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
4602 /* If we have a new signal, enqueue the signal. */
4603 if (lwp
->resume
->sig
!= 0)
4605 struct pending_signals
*p_sig
= XCNEW (struct pending_signals
);
4607 p_sig
->prev
= lwp
->pending_signals
;
4608 p_sig
->signal
= lwp
->resume
->sig
;
4610 /* If this is the same signal we were previously stopped by,
4611 make sure to queue its siginfo. We can ignore the return
4612 value of ptrace; if it fails, we'll skip
4613 PTRACE_SETSIGINFO. */
4614 if (WIFSTOPPED (lwp
->last_status
)
4615 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
4616 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4619 lwp
->pending_signals
= p_sig
;
4623 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4629 linux_resume (struct thread_resume
*resume_info
, size_t n
)
4631 struct thread_resume_array array
= { resume_info
, n
};
4632 struct thread_info
*need_step_over
= NULL
;
4634 int leave_all_stopped
;
4639 debug_printf ("linux_resume:\n");
4642 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
4644 /* If there is a thread which would otherwise be resumed, which has
4645 a pending status, then don't resume any threads - we can just
4646 report the pending status. Make sure to queue any signals that
4647 would otherwise be sent. In non-stop mode, we'll apply this
4648 logic to each thread individually. We consume all pending events
4649 before considering to start a step-over (in all-stop). */
4652 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
4654 /* If there is a thread which would otherwise be resumed, which is
4655 stopped at a breakpoint that needs stepping over, then don't
4656 resume any threads - have it step over the breakpoint with all
4657 other threads stopped, then resume all threads again. Make sure
4658 to queue any signals that would otherwise be delivered or
4660 if (!any_pending
&& supports_breakpoints ())
4662 = (struct thread_info
*) find_inferior (&all_threads
,
4663 need_step_over_p
, NULL
);
4665 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
4669 if (need_step_over
!= NULL
)
4670 debug_printf ("Not resuming all, need step over\n");
4671 else if (any_pending
)
4672 debug_printf ("Not resuming, all-stop and found "
4673 "an LWP with pending status\n");
4675 debug_printf ("Resuming, no pending status or step over needed\n");
4678 /* Even if we're leaving threads stopped, queue all signals we'd
4679 otherwise deliver. */
4680 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
4683 start_step_over (get_thread_lwp (need_step_over
));
4687 debug_printf ("linux_resume done\n");
4692 /* This function is called once per thread. We check the thread's
4693 last resume request, which will tell us whether to resume, step, or
4694 leave the thread stopped. Any signal the client requested to be
4695 delivered has already been enqueued at this point.
4697 If any thread that GDB wants running is stopped at an internal
4698 breakpoint that needs stepping over, we start a step-over operation
4699 on that particular thread, and leave all others stopped. */
4702 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4704 struct thread_info
*thread
= (struct thread_info
*) entry
;
4705 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4712 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
4717 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
4721 if (thread
->last_resume_kind
== resume_stop
4722 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
4725 debug_printf (" client wants LWP to remain %ld stopped\n",
4730 if (lwp
->status_pending_p
)
4733 debug_printf (" LWP %ld has pending status, leaving stopped\n",
4738 gdb_assert (lwp
->suspended
>= 0);
4743 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
4747 if (thread
->last_resume_kind
== resume_stop
4748 && lwp
->pending_signals_to_report
== NULL
4749 && lwp
->collecting_fast_tracepoint
== 0)
4751 /* We haven't reported this LWP as stopped yet (otherwise, the
4752 last_status.kind check above would catch it, and we wouldn't
4753 reach here. This LWP may have been momentarily paused by a
4754 stop_all_lwps call while handling for example, another LWP's
4755 step-over. In that case, the pending expected SIGSTOP signal
4756 that was queued at vCont;t handling time will have already
4757 been consumed by wait_for_sigstop, and so we need to requeue
4758 another one here. Note that if the LWP already has a SIGSTOP
4759 pending, this is a no-op. */
4762 debug_printf ("Client wants LWP %ld to stop. "
4763 "Making sure it has a SIGSTOP pending\n",
4769 if (thread
->last_resume_kind
== resume_step
)
4772 debug_printf (" stepping LWP %ld, client wants it stepping\n",
4776 else if (lwp
->bp_reinsert
!= 0)
4779 debug_printf (" stepping LWP %ld, reinsert set\n",
4786 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4791 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4793 struct thread_info
*thread
= (struct thread_info
*) entry
;
4794 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4799 lwp_suspended_decr (lwp
);
4801 return proceed_one_lwp (entry
, except
);
4804 /* When we finish a step-over, set threads running again. If there's
4805 another thread that may need a step-over, now's the time to start
4806 it. Eventually, we'll move all threads past their breakpoints. */
4809 proceed_all_lwps (void)
4811 struct thread_info
*need_step_over
;
4813 /* If there is a thread which would otherwise be resumed, which is
4814 stopped at a breakpoint that needs stepping over, then don't
4815 resume any threads - have it step over the breakpoint with all
4816 other threads stopped, then resume all threads again. */
4818 if (supports_breakpoints ())
4821 = (struct thread_info
*) find_inferior (&all_threads
,
4822 need_step_over_p
, NULL
);
4824 if (need_step_over
!= NULL
)
4827 debug_printf ("proceed_all_lwps: found "
4828 "thread %ld needing a step-over\n",
4829 lwpid_of (need_step_over
));
4831 start_step_over (get_thread_lwp (need_step_over
));
4837 debug_printf ("Proceeding, no step-over needed\n");
4839 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
4842 /* Stopped LWPs that the client wanted to be running, that don't have
4843 pending statuses, are set to run again, except for EXCEPT, if not
4844 NULL. This undoes a stop_all_lwps call. */
4847 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
4853 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
4854 lwpid_of (get_lwp_thread (except
)));
4856 debug_printf ("unstopping all lwps\n");
4860 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
4862 find_inferior (&all_threads
, proceed_one_lwp
, except
);
4866 debug_printf ("unstop_all_lwps done\n");
4872 #ifdef HAVE_LINUX_REGSETS
4874 #define use_linux_regsets 1
4876 /* Returns true if REGSET has been disabled. */
4879 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
4881 return (info
->disabled_regsets
!= NULL
4882 && info
->disabled_regsets
[regset
- info
->regsets
]);
4885 /* Disable REGSET. */
4888 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
4892 dr_offset
= regset
- info
->regsets
;
4893 if (info
->disabled_regsets
== NULL
)
4894 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
4895 info
->disabled_regsets
[dr_offset
] = 1;
4899 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
4900 struct regcache
*regcache
)
4902 struct regset_info
*regset
;
4903 int saw_general_regs
= 0;
4907 pid
= lwpid_of (current_thread
);
4908 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4913 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4916 buf
= xmalloc (regset
->size
);
4918 nt_type
= regset
->nt_type
;
4922 iov
.iov_len
= regset
->size
;
4923 data
= (void *) &iov
;
4929 res
= ptrace (regset
->get_request
, pid
,
4930 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4932 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4938 /* If we get EIO on a regset, do not try it again for
4939 this process mode. */
4940 disable_regset (regsets_info
, regset
);
4942 else if (errno
== ENODATA
)
4944 /* ENODATA may be returned if the regset is currently
4945 not "active". This can happen in normal operation,
4946 so suppress the warning in this case. */
4951 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
4958 if (regset
->type
== GENERAL_REGS
)
4959 saw_general_regs
= 1;
4960 regset
->store_function (regcache
, buf
);
4964 if (saw_general_regs
)
4971 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
4972 struct regcache
*regcache
)
4974 struct regset_info
*regset
;
4975 int saw_general_regs
= 0;
4979 pid
= lwpid_of (current_thread
);
4980 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4985 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
4986 || regset
->fill_function
== NULL
)
4989 buf
= xmalloc (regset
->size
);
4991 /* First fill the buffer with the current register set contents,
4992 in case there are any items in the kernel's regset that are
4993 not in gdbserver's regcache. */
4995 nt_type
= regset
->nt_type
;
4999 iov
.iov_len
= regset
->size
;
5000 data
= (void *) &iov
;
5006 res
= ptrace (regset
->get_request
, pid
,
5007 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5009 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5014 /* Then overlay our cached registers on that. */
5015 regset
->fill_function (regcache
, buf
);
5017 /* Only now do we write the register set. */
5019 res
= ptrace (regset
->set_request
, pid
,
5020 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5022 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5030 /* If we get EIO on a regset, do not try it again for
5031 this process mode. */
5032 disable_regset (regsets_info
, regset
);
5034 else if (errno
== ESRCH
)
5036 /* At this point, ESRCH should mean the process is
5037 already gone, in which case we simply ignore attempts
5038 to change its registers. See also the related
5039 comment in linux_resume_one_lwp. */
5045 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5048 else if (regset
->type
== GENERAL_REGS
)
5049 saw_general_regs
= 1;
5052 if (saw_general_regs
)
5058 #else /* !HAVE_LINUX_REGSETS */
5060 #define use_linux_regsets 0
5061 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5062 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5066 /* Return 1 if register REGNO is supported by one of the regset ptrace
5067 calls or 0 if it has to be transferred individually. */
5070 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5072 unsigned char mask
= 1 << (regno
% 8);
5073 size_t index
= regno
/ 8;
5075 return (use_linux_regsets
5076 && (regs_info
->regset_bitmap
== NULL
5077 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5080 #ifdef HAVE_LINUX_USRREGS
5083 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5087 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5088 error ("Invalid register number %d.", regnum
);
5090 addr
= usrregs
->regmap
[regnum
];
5095 /* Fetch one register. */
5097 fetch_register (const struct usrregs_info
*usrregs
,
5098 struct regcache
*regcache
, int regno
)
5105 if (regno
>= usrregs
->num_regs
)
5107 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5110 regaddr
= register_addr (usrregs
, regno
);
5114 size
= ((register_size (regcache
->tdesc
, regno
)
5115 + sizeof (PTRACE_XFER_TYPE
) - 1)
5116 & -sizeof (PTRACE_XFER_TYPE
));
5117 buf
= (char *) alloca (size
);
5119 pid
= lwpid_of (current_thread
);
5120 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5123 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5124 ptrace (PTRACE_PEEKUSER
, pid
,
5125 /* Coerce to a uintptr_t first to avoid potential gcc warning
5126 of coercing an 8 byte integer to a 4 byte pointer. */
5127 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5128 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5130 error ("reading register %d: %s", regno
, strerror (errno
));
5133 if (the_low_target
.supply_ptrace_register
)
5134 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5136 supply_register (regcache
, regno
, buf
);
5139 /* Store one register. */
5141 store_register (const struct usrregs_info
*usrregs
,
5142 struct regcache
*regcache
, int regno
)
5149 if (regno
>= usrregs
->num_regs
)
5151 if ((*the_low_target
.cannot_store_register
) (regno
))
5154 regaddr
= register_addr (usrregs
, regno
);
5158 size
= ((register_size (regcache
->tdesc
, regno
)
5159 + sizeof (PTRACE_XFER_TYPE
) - 1)
5160 & -sizeof (PTRACE_XFER_TYPE
));
5161 buf
= (char *) alloca (size
);
5162 memset (buf
, 0, size
);
5164 if (the_low_target
.collect_ptrace_register
)
5165 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5167 collect_register (regcache
, regno
, buf
);
5169 pid
= lwpid_of (current_thread
);
5170 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5173 ptrace (PTRACE_POKEUSER
, pid
,
5174 /* Coerce to a uintptr_t first to avoid potential gcc warning
5175 about coercing an 8 byte integer to a 4 byte pointer. */
5176 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5177 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5180 /* At this point, ESRCH should mean the process is
5181 already gone, in which case we simply ignore attempts
5182 to change its registers. See also the related
5183 comment in linux_resume_one_lwp. */
5187 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5188 error ("writing register %d: %s", regno
, strerror (errno
));
5190 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5194 /* Fetch all registers, or just one, from the child process.
5195 If REGNO is -1, do this for all registers, skipping any that are
5196 assumed to have been retrieved by regsets_fetch_inferior_registers,
5197 unless ALL is non-zero.
5198 Otherwise, REGNO specifies which register (so we can save time). */
5200 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5201 struct regcache
*regcache
, int regno
, int all
)
5203 struct usrregs_info
*usr
= regs_info
->usrregs
;
5207 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5208 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5209 fetch_register (usr
, regcache
, regno
);
5212 fetch_register (usr
, regcache
, regno
);
5215 /* Store our register values back into the inferior.
5216 If REGNO is -1, do this for all registers, skipping any that are
5217 assumed to have been saved by regsets_store_inferior_registers,
5218 unless ALL is non-zero.
5219 Otherwise, REGNO specifies which register (so we can save time). */
5221 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5222 struct regcache
*regcache
, int regno
, int all
)
5224 struct usrregs_info
*usr
= regs_info
->usrregs
;
5228 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5229 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5230 store_register (usr
, regcache
, regno
);
5233 store_register (usr
, regcache
, regno
);
5236 #else /* !HAVE_LINUX_USRREGS */
5238 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5239 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5245 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5249 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5253 if (the_low_target
.fetch_register
!= NULL
5254 && regs_info
->usrregs
!= NULL
)
5255 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5256 (*the_low_target
.fetch_register
) (regcache
, regno
);
5258 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5259 if (regs_info
->usrregs
!= NULL
)
5260 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5264 if (the_low_target
.fetch_register
!= NULL
5265 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5268 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5270 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5272 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5273 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5278 linux_store_registers (struct regcache
*regcache
, int regno
)
5282 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5286 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5288 if (regs_info
->usrregs
!= NULL
)
5289 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5293 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5295 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5297 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5298 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5303 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5304 to debugger memory starting at MYADDR. */
5307 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5309 int pid
= lwpid_of (current_thread
);
5310 register PTRACE_XFER_TYPE
*buffer
;
5311 register CORE_ADDR addr
;
5318 /* Try using /proc. Don't bother for one word. */
5319 if (len
>= 3 * sizeof (long))
5323 /* We could keep this file open and cache it - possibly one per
5324 thread. That requires some juggling, but is even faster. */
5325 sprintf (filename
, "/proc/%d/mem", pid
);
5326 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5330 /* If pread64 is available, use it. It's faster if the kernel
5331 supports it (only one syscall), and it's 64-bit safe even on
5332 32-bit platforms (for instance, SPARC debugging a SPARC64
5335 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5338 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5339 bytes
= read (fd
, myaddr
, len
);
5346 /* Some data was read, we'll try to get the rest with ptrace. */
5356 /* Round starting address down to longword boundary. */
5357 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5358 /* Round ending address up; get number of longwords that makes. */
5359 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5360 / sizeof (PTRACE_XFER_TYPE
));
5361 /* Allocate buffer of that many longwords. */
5362 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5364 /* Read all the longwords */
5366 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5368 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5369 about coercing an 8 byte integer to a 4 byte pointer. */
5370 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5371 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5372 (PTRACE_TYPE_ARG4
) 0);
5378 /* Copy appropriate bytes out of the buffer. */
5381 i
*= sizeof (PTRACE_XFER_TYPE
);
5382 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5384 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5391 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5392 memory at MEMADDR. On failure (cannot write to the inferior)
5393 returns the value of errno. Always succeeds if LEN is zero. */
5396 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5399 /* Round starting address down to longword boundary. */
5400 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5401 /* Round ending address up; get number of longwords that makes. */
5403 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5404 / sizeof (PTRACE_XFER_TYPE
);
5406 /* Allocate buffer of that many longwords. */
5407 register PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5409 int pid
= lwpid_of (current_thread
);
5413 /* Zero length write always succeeds. */
5419 /* Dump up to four bytes. */
5420 char str
[4 * 2 + 1];
5422 int dump
= len
< 4 ? len
: 4;
5424 for (i
= 0; i
< dump
; i
++)
5426 sprintf (p
, "%02x", myaddr
[i
]);
5431 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5432 str
, (long) memaddr
, pid
);
5435 /* Fill start and end extra bytes of buffer with existing memory data. */
5438 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5439 about coercing an 8 byte integer to a 4 byte pointer. */
5440 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5441 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5442 (PTRACE_TYPE_ARG4
) 0);
5450 = ptrace (PTRACE_PEEKTEXT
, pid
,
5451 /* Coerce to a uintptr_t first to avoid potential gcc warning
5452 about coercing an 8 byte integer to a 4 byte pointer. */
5453 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5454 * sizeof (PTRACE_XFER_TYPE
)),
5455 (PTRACE_TYPE_ARG4
) 0);
5460 /* Copy data to be written over corresponding part of buffer. */
5462 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5465 /* Write the entire buffer. */
5467 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5470 ptrace (PTRACE_POKETEXT
, pid
,
5471 /* Coerce to a uintptr_t first to avoid potential gcc warning
5472 about coercing an 8 byte integer to a 4 byte pointer. */
5473 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5474 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5483 linux_look_up_symbols (void)
5485 #ifdef USE_THREAD_DB
5486 struct process_info
*proc
= current_process ();
5488 if (proc
->priv
->thread_db
!= NULL
)
5491 /* If the kernel supports tracing clones, then we don't need to
5492 use the magic thread event breakpoint to learn about
5494 thread_db_init (!linux_supports_traceclone ());
5499 linux_request_interrupt (void)
5501 extern unsigned long signal_pid
;
5503 /* Send a SIGINT to the process group. This acts just like the user
5504 typed a ^C on the controlling terminal. */
5505 kill (-signal_pid
, SIGINT
);
5508 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5509 to debugger memory starting at MYADDR. */
5512 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5514 char filename
[PATH_MAX
];
5516 int pid
= lwpid_of (current_thread
);
5518 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5520 fd
= open (filename
, O_RDONLY
);
5524 if (offset
!= (CORE_ADDR
) 0
5525 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5528 n
= read (fd
, myaddr
, len
);
5535 /* These breakpoint and watchpoint related wrapper functions simply
5536 pass on the function call if the target has registered a
5537 corresponding function. */
5540 linux_supports_z_point_type (char z_type
)
5542 return (the_low_target
.supports_z_point_type
!= NULL
5543 && the_low_target
.supports_z_point_type (z_type
));
5547 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5548 int size
, struct raw_breakpoint
*bp
)
5550 if (type
== raw_bkpt_type_sw
)
5551 return insert_memory_breakpoint (bp
);
5552 else if (the_low_target
.insert_point
!= NULL
)
5553 return the_low_target
.insert_point (type
, addr
, size
, bp
);
5555 /* Unsupported (see target.h). */
5560 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5561 int size
, struct raw_breakpoint
*bp
)
5563 if (type
== raw_bkpt_type_sw
)
5564 return remove_memory_breakpoint (bp
);
5565 else if (the_low_target
.remove_point
!= NULL
)
5566 return the_low_target
.remove_point (type
, addr
, size
, bp
);
5568 /* Unsupported (see target.h). */
5572 /* Implement the to_stopped_by_sw_breakpoint target_ops
5576 linux_stopped_by_sw_breakpoint (void)
5578 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5580 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
5583 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
5587 linux_supports_stopped_by_sw_breakpoint (void)
5589 return USE_SIGTRAP_SIGINFO
;
5592 /* Implement the to_stopped_by_hw_breakpoint target_ops
5596 linux_stopped_by_hw_breakpoint (void)
5598 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5600 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
5603 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
5607 linux_supports_stopped_by_hw_breakpoint (void)
5609 return USE_SIGTRAP_SIGINFO
;
5612 /* Implement the supports_hardware_single_step target_ops method. */
5615 linux_supports_hardware_single_step (void)
5617 return can_hardware_single_step ();
5621 linux_stopped_by_watchpoint (void)
5623 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5625 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
5629 linux_stopped_data_address (void)
5631 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5633 return lwp
->stopped_data_address
;
5636 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
5637 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
5638 && defined(PT_TEXT_END_ADDR)
5640 /* This is only used for targets that define PT_TEXT_ADDR,
5641 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
5642 the target has different ways of acquiring this information, like
5645 /* Under uClinux, programs are loaded at non-zero offsets, which we need
5646 to tell gdb about. */
5649 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
5651 unsigned long text
, text_end
, data
;
5652 int pid
= lwpid_of (current_thread
);
5656 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
5657 (PTRACE_TYPE_ARG4
) 0);
5658 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
5659 (PTRACE_TYPE_ARG4
) 0);
5660 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
5661 (PTRACE_TYPE_ARG4
) 0);
5665 /* Both text and data offsets produced at compile-time (and so
5666 used by gdb) are relative to the beginning of the program,
5667 with the data segment immediately following the text segment.
5668 However, the actual runtime layout in memory may put the data
5669 somewhere else, so when we send gdb a data base-address, we
5670 use the real data base address and subtract the compile-time
5671 data base-address from it (which is just the length of the
5672 text segment). BSS immediately follows data in both
5675 *data_p
= data
- (text_end
- text
);
5684 linux_qxfer_osdata (const char *annex
,
5685 unsigned char *readbuf
, unsigned const char *writebuf
,
5686 CORE_ADDR offset
, int len
)
5688 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
5691 /* Convert a native/host siginfo object, into/from the siginfo in the
5692 layout of the inferiors' architecture. */
5695 siginfo_fixup (siginfo_t
*siginfo
, void *inf_siginfo
, int direction
)
5699 if (the_low_target
.siginfo_fixup
!= NULL
)
5700 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
5702 /* If there was no callback, or the callback didn't do anything,
5703 then just do a straight memcpy. */
5707 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
5709 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
5714 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
5715 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
5719 char inf_siginfo
[sizeof (siginfo_t
)];
5721 if (current_thread
== NULL
)
5724 pid
= lwpid_of (current_thread
);
5727 debug_printf ("%s siginfo for lwp %d.\n",
5728 readbuf
!= NULL
? "Reading" : "Writing",
5731 if (offset
>= sizeof (siginfo
))
5734 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5737 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
5738 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
5739 inferior with a 64-bit GDBSERVER should look the same as debugging it
5740 with a 32-bit GDBSERVER, we need to convert it. */
5741 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
5743 if (offset
+ len
> sizeof (siginfo
))
5744 len
= sizeof (siginfo
) - offset
;
5746 if (readbuf
!= NULL
)
5747 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
5750 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
5752 /* Convert back to ptrace layout before flushing it out. */
5753 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
5755 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5762 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5763 so we notice when children change state; as the handler for the
5764 sigsuspend in my_waitpid. */
5767 sigchld_handler (int signo
)
5769 int old_errno
= errno
;
5775 /* fprintf is not async-signal-safe, so call write
5777 if (write (2, "sigchld_handler\n",
5778 sizeof ("sigchld_handler\n") - 1) < 0)
5779 break; /* just ignore */
5783 if (target_is_async_p ())
5784 async_file_mark (); /* trigger a linux_wait */
5790 linux_supports_non_stop (void)
5796 linux_async (int enable
)
5798 int previous
= target_is_async_p ();
5801 debug_printf ("linux_async (%d), previous=%d\n",
5804 if (previous
!= enable
)
5807 sigemptyset (&mask
);
5808 sigaddset (&mask
, SIGCHLD
);
5810 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
5814 if (pipe (linux_event_pipe
) == -1)
5816 linux_event_pipe
[0] = -1;
5817 linux_event_pipe
[1] = -1;
5818 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5820 warning ("creating event pipe failed.");
5824 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5825 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5827 /* Register the event loop handler. */
5828 add_file_handler (linux_event_pipe
[0],
5829 handle_target_event
, NULL
);
5831 /* Always trigger a linux_wait. */
5836 delete_file_handler (linux_event_pipe
[0]);
5838 close (linux_event_pipe
[0]);
5839 close (linux_event_pipe
[1]);
5840 linux_event_pipe
[0] = -1;
5841 linux_event_pipe
[1] = -1;
5844 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5851 linux_start_non_stop (int nonstop
)
5853 /* Register or unregister from event-loop accordingly. */
5854 linux_async (nonstop
);
5856 if (target_is_async_p () != (nonstop
!= 0))
5863 linux_supports_multi_process (void)
5868 /* Check if fork events are supported. */
5871 linux_supports_fork_events (void)
5873 return linux_supports_tracefork ();
5876 /* Check if vfork events are supported. */
5879 linux_supports_vfork_events (void)
5881 return linux_supports_tracefork ();
5884 /* Check if exec events are supported. */
5887 linux_supports_exec_events (void)
5889 return linux_supports_traceexec ();
5892 /* Callback for 'find_inferior'. Set the (possibly changed) ptrace
5893 options for the specified lwp. */
5896 reset_lwp_ptrace_options_callback (struct inferior_list_entry
*entry
,
5899 struct thread_info
*thread
= (struct thread_info
*) entry
;
5900 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5904 /* Stop the lwp so we can modify its ptrace options. */
5905 lwp
->must_set_ptrace_flags
= 1;
5906 linux_stop_lwp (lwp
);
5910 /* Already stopped; go ahead and set the ptrace options. */
5911 struct process_info
*proc
= find_process_pid (pid_of (thread
));
5912 int options
= linux_low_ptrace_options (proc
->attached
);
5914 linux_enable_event_reporting (lwpid_of (thread
), options
);
5915 lwp
->must_set_ptrace_flags
= 0;
5921 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
5922 ptrace flags for all inferiors. This is in case the new GDB connection
5923 doesn't support the same set of events that the previous one did. */
5926 linux_handle_new_gdb_connection (void)
5930 /* Request that all the lwps reset their ptrace options. */
5931 find_inferior (&all_threads
, reset_lwp_ptrace_options_callback
, &pid
);
5935 linux_supports_disable_randomization (void)
5937 #ifdef HAVE_PERSONALITY
5945 linux_supports_agent (void)
5951 linux_supports_range_stepping (void)
5953 if (*the_low_target
.supports_range_stepping
== NULL
)
5956 return (*the_low_target
.supports_range_stepping
) ();
5959 /* Enumerate spufs IDs for process PID. */
5961 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
5967 struct dirent
*entry
;
5969 sprintf (path
, "/proc/%ld/fd", pid
);
5970 dir
= opendir (path
);
5975 while ((entry
= readdir (dir
)) != NULL
)
5981 fd
= atoi (entry
->d_name
);
5985 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
5986 if (stat (path
, &st
) != 0)
5988 if (!S_ISDIR (st
.st_mode
))
5991 if (statfs (path
, &stfs
) != 0)
5993 if (stfs
.f_type
!= SPUFS_MAGIC
)
5996 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
5998 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6008 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6009 object type, using the /proc file system. */
6011 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6012 unsigned const char *writebuf
,
6013 CORE_ADDR offset
, int len
)
6015 long pid
= lwpid_of (current_thread
);
6020 if (!writebuf
&& !readbuf
)
6028 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6031 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6032 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6037 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6044 ret
= write (fd
, writebuf
, (size_t) len
);
6046 ret
= read (fd
, readbuf
, (size_t) len
);
6052 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6053 struct target_loadseg
6055 /* Core address to which the segment is mapped. */
6057 /* VMA recorded in the program header. */
6059 /* Size of this segment in memory. */
6063 # if defined PT_GETDSBT
6064 struct target_loadmap
6066 /* Protocol version number, must be zero. */
6068 /* Pointer to the DSBT table, its size, and the DSBT index. */
6069 unsigned *dsbt_table
;
6070 unsigned dsbt_size
, dsbt_index
;
6071 /* Number of segments in this map. */
6073 /* The actual memory map. */
6074 struct target_loadseg segs
[/*nsegs*/];
6076 # define LINUX_LOADMAP PT_GETDSBT
6077 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6078 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6080 struct target_loadmap
6082 /* Protocol version number, must be zero. */
6084 /* Number of segments in this map. */
6086 /* The actual memory map. */
6087 struct target_loadseg segs
[/*nsegs*/];
6089 # define LINUX_LOADMAP PTRACE_GETFDPIC
6090 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6091 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6095 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6096 unsigned char *myaddr
, unsigned int len
)
6098 int pid
= lwpid_of (current_thread
);
6100 struct target_loadmap
*data
= NULL
;
6101 unsigned int actual_length
, copy_length
;
6103 if (strcmp (annex
, "exec") == 0)
6104 addr
= (int) LINUX_LOADMAP_EXEC
;
6105 else if (strcmp (annex
, "interp") == 0)
6106 addr
= (int) LINUX_LOADMAP_INTERP
;
6110 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6116 actual_length
= sizeof (struct target_loadmap
)
6117 + sizeof (struct target_loadseg
) * data
->nsegs
;
6119 if (offset
< 0 || offset
> actual_length
)
6122 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6123 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6127 # define linux_read_loadmap NULL
6128 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6131 linux_process_qsupported (const char *query
)
6133 if (the_low_target
.process_qsupported
!= NULL
)
6134 the_low_target
.process_qsupported (query
);
6138 linux_supports_tracepoints (void)
6140 if (*the_low_target
.supports_tracepoints
== NULL
)
6143 return (*the_low_target
.supports_tracepoints
) ();
6147 linux_read_pc (struct regcache
*regcache
)
6149 if (the_low_target
.get_pc
== NULL
)
6152 return (*the_low_target
.get_pc
) (regcache
);
6156 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6158 gdb_assert (the_low_target
.set_pc
!= NULL
);
6160 (*the_low_target
.set_pc
) (regcache
, pc
);
6164 linux_thread_stopped (struct thread_info
*thread
)
6166 return get_thread_lwp (thread
)->stopped
;
6169 /* This exposes stop-all-threads functionality to other modules. */
6172 linux_pause_all (int freeze
)
6174 stop_all_lwps (freeze
, NULL
);
6177 /* This exposes unstop-all-threads functionality to other gdbserver
6181 linux_unpause_all (int unfreeze
)
6183 unstop_all_lwps (unfreeze
, NULL
);
6187 linux_prepare_to_access_memory (void)
6189 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6192 linux_pause_all (1);
6197 linux_done_accessing_memory (void)
6199 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6202 linux_unpause_all (1);
6206 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6207 CORE_ADDR collector
,
6210 CORE_ADDR
*jump_entry
,
6211 CORE_ADDR
*trampoline
,
6212 ULONGEST
*trampoline_size
,
6213 unsigned char *jjump_pad_insn
,
6214 ULONGEST
*jjump_pad_insn_size
,
6215 CORE_ADDR
*adjusted_insn_addr
,
6216 CORE_ADDR
*adjusted_insn_addr_end
,
6219 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6220 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6221 jump_entry
, trampoline
, trampoline_size
,
6222 jjump_pad_insn
, jjump_pad_insn_size
,
6223 adjusted_insn_addr
, adjusted_insn_addr_end
,
6227 static struct emit_ops
*
6228 linux_emit_ops (void)
6230 if (the_low_target
.emit_ops
!= NULL
)
6231 return (*the_low_target
.emit_ops
) ();
6237 linux_get_min_fast_tracepoint_insn_len (void)
6239 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6242 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6245 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6246 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6248 char filename
[PATH_MAX
];
6250 const int auxv_size
= is_elf64
6251 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6252 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6254 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6256 fd
= open (filename
, O_RDONLY
);
6262 while (read (fd
, buf
, auxv_size
) == auxv_size
6263 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6267 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6269 switch (aux
->a_type
)
6272 *phdr_memaddr
= aux
->a_un
.a_val
;
6275 *num_phdr
= aux
->a_un
.a_val
;
6281 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6283 switch (aux
->a_type
)
6286 *phdr_memaddr
= aux
->a_un
.a_val
;
6289 *num_phdr
= aux
->a_un
.a_val
;
6297 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6299 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6300 "phdr_memaddr = %ld, phdr_num = %d",
6301 (long) *phdr_memaddr
, *num_phdr
);
6308 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6311 get_dynamic (const int pid
, const int is_elf64
)
6313 CORE_ADDR phdr_memaddr
, relocation
;
6315 unsigned char *phdr_buf
;
6316 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6318 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6321 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6322 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6324 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6327 /* Compute relocation: it is expected to be 0 for "regular" executables,
6328 non-zero for PIE ones. */
6330 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6333 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6335 if (p
->p_type
== PT_PHDR
)
6336 relocation
= phdr_memaddr
- p
->p_vaddr
;
6340 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6342 if (p
->p_type
== PT_PHDR
)
6343 relocation
= phdr_memaddr
- p
->p_vaddr
;
6346 if (relocation
== -1)
6348 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6349 any real world executables, including PIE executables, have always
6350 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6351 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6352 or present DT_DEBUG anyway (fpc binaries are statically linked).
6354 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6356 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6361 for (i
= 0; i
< num_phdr
; i
++)
6365 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6367 if (p
->p_type
== PT_DYNAMIC
)
6368 return p
->p_vaddr
+ relocation
;
6372 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6374 if (p
->p_type
== PT_DYNAMIC
)
6375 return p
->p_vaddr
+ relocation
;
6382 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6383 can be 0 if the inferior does not yet have the library list initialized.
6384 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6385 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6388 get_r_debug (const int pid
, const int is_elf64
)
6390 CORE_ADDR dynamic_memaddr
;
6391 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6392 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6395 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6396 if (dynamic_memaddr
== 0)
6399 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6403 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6404 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6408 unsigned char buf
[sizeof (Elf64_Xword
)];
6412 #ifdef DT_MIPS_RLD_MAP
6413 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6415 if (linux_read_memory (dyn
->d_un
.d_val
,
6416 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6421 #endif /* DT_MIPS_RLD_MAP */
6422 #ifdef DT_MIPS_RLD_MAP_REL
6423 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6425 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6426 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6431 #endif /* DT_MIPS_RLD_MAP_REL */
6433 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6434 map
= dyn
->d_un
.d_val
;
6436 if (dyn
->d_tag
== DT_NULL
)
6441 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6442 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6446 unsigned char buf
[sizeof (Elf32_Word
)];
6450 #ifdef DT_MIPS_RLD_MAP
6451 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6453 if (linux_read_memory (dyn
->d_un
.d_val
,
6454 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6459 #endif /* DT_MIPS_RLD_MAP */
6460 #ifdef DT_MIPS_RLD_MAP_REL
6461 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6463 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6464 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6469 #endif /* DT_MIPS_RLD_MAP_REL */
6471 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6472 map
= dyn
->d_un
.d_val
;
6474 if (dyn
->d_tag
== DT_NULL
)
6478 dynamic_memaddr
+= dyn_size
;
6484 /* Read one pointer from MEMADDR in the inferior. */
6487 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6491 /* Go through a union so this works on either big or little endian
6492 hosts, when the inferior's pointer size is smaller than the size
6493 of CORE_ADDR. It is assumed the inferior's endianness is the
6494 same of the superior's. */
6497 CORE_ADDR core_addr
;
6502 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6505 if (ptr_size
== sizeof (CORE_ADDR
))
6506 *ptr
= addr
.core_addr
;
6507 else if (ptr_size
== sizeof (unsigned int))
6510 gdb_assert_not_reached ("unhandled pointer size");
6515 struct link_map_offsets
6517 /* Offset and size of r_debug.r_version. */
6518 int r_version_offset
;
6520 /* Offset and size of r_debug.r_map. */
6523 /* Offset to l_addr field in struct link_map. */
6526 /* Offset to l_name field in struct link_map. */
6529 /* Offset to l_ld field in struct link_map. */
6532 /* Offset to l_next field in struct link_map. */
6535 /* Offset to l_prev field in struct link_map. */
6539 /* Construct qXfer:libraries-svr4:read reply. */
6542 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
6543 unsigned const char *writebuf
,
6544 CORE_ADDR offset
, int len
)
6547 unsigned document_len
;
6548 struct process_info_private
*const priv
= current_process ()->priv
;
6549 char filename
[PATH_MAX
];
6552 static const struct link_map_offsets lmo_32bit_offsets
=
6554 0, /* r_version offset. */
6555 4, /* r_debug.r_map offset. */
6556 0, /* l_addr offset in link_map. */
6557 4, /* l_name offset in link_map. */
6558 8, /* l_ld offset in link_map. */
6559 12, /* l_next offset in link_map. */
6560 16 /* l_prev offset in link_map. */
6563 static const struct link_map_offsets lmo_64bit_offsets
=
6565 0, /* r_version offset. */
6566 8, /* r_debug.r_map offset. */
6567 0, /* l_addr offset in link_map. */
6568 8, /* l_name offset in link_map. */
6569 16, /* l_ld offset in link_map. */
6570 24, /* l_next offset in link_map. */
6571 32 /* l_prev offset in link_map. */
6573 const struct link_map_offsets
*lmo
;
6574 unsigned int machine
;
6576 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
6577 int allocated
= 1024;
6579 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
6580 int header_done
= 0;
6582 if (writebuf
!= NULL
)
6584 if (readbuf
== NULL
)
6587 pid
= lwpid_of (current_thread
);
6588 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
6589 is_elf64
= elf_64_file_p (filename
, &machine
);
6590 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
6591 ptr_size
= is_elf64
? 8 : 4;
6593 while (annex
[0] != '\0')
6599 sep
= strchr (annex
, '=');
6604 if (len
== 5 && startswith (annex
, "start"))
6606 else if (len
== 4 && startswith (annex
, "prev"))
6610 annex
= strchr (sep
, ';');
6617 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
6624 if (priv
->r_debug
== 0)
6625 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
6627 /* We failed to find DT_DEBUG. Such situation will not change
6628 for this inferior - do not retry it. Report it to GDB as
6629 E01, see for the reasons at the GDB solib-svr4.c side. */
6630 if (priv
->r_debug
== (CORE_ADDR
) -1)
6633 if (priv
->r_debug
!= 0)
6635 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
6636 (unsigned char *) &r_version
,
6637 sizeof (r_version
)) != 0
6640 warning ("unexpected r_debug version %d", r_version
);
6642 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
6643 &lm_addr
, ptr_size
) != 0)
6645 warning ("unable to read r_map from 0x%lx",
6646 (long) priv
->r_debug
+ lmo
->r_map_offset
);
6651 document
= (char *) xmalloc (allocated
);
6652 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
6653 p
= document
+ strlen (document
);
6656 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
6657 &l_name
, ptr_size
) == 0
6658 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
6659 &l_addr
, ptr_size
) == 0
6660 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
6661 &l_ld
, ptr_size
) == 0
6662 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
6663 &l_prev
, ptr_size
) == 0
6664 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
6665 &l_next
, ptr_size
) == 0)
6667 unsigned char libname
[PATH_MAX
];
6669 if (lm_prev
!= l_prev
)
6671 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
6672 (long) lm_prev
, (long) l_prev
);
6676 /* Ignore the first entry even if it has valid name as the first entry
6677 corresponds to the main executable. The first entry should not be
6678 skipped if the dynamic loader was loaded late by a static executable
6679 (see solib-svr4.c parameter ignore_first). But in such case the main
6680 executable does not have PT_DYNAMIC present and this function already
6681 exited above due to failed get_r_debug. */
6684 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
6689 /* Not checking for error because reading may stop before
6690 we've got PATH_MAX worth of characters. */
6692 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
6693 libname
[sizeof (libname
) - 1] = '\0';
6694 if (libname
[0] != '\0')
6696 /* 6x the size for xml_escape_text below. */
6697 size_t len
= 6 * strlen ((char *) libname
);
6702 /* Terminate `<library-list-svr4'. */
6707 while (allocated
< p
- document
+ len
+ 200)
6709 /* Expand to guarantee sufficient storage. */
6710 uintptr_t document_len
= p
- document
;
6712 document
= (char *) xrealloc (document
, 2 * allocated
);
6714 p
= document
+ document_len
;
6717 name
= xml_escape_text ((char *) libname
);
6718 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
6719 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
6720 name
, (unsigned long) lm_addr
,
6721 (unsigned long) l_addr
, (unsigned long) l_ld
);
6732 /* Empty list; terminate `<library-list-svr4'. */
6736 strcpy (p
, "</library-list-svr4>");
6738 document_len
= strlen (document
);
6739 if (offset
< document_len
)
6740 document_len
-= offset
;
6743 if (len
> document_len
)
6746 memcpy (readbuf
, document
+ offset
, len
);
6752 #ifdef HAVE_LINUX_BTRACE
6754 /* See to_disable_btrace target method. */
6757 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
6759 enum btrace_error err
;
6761 err
= linux_disable_btrace (tinfo
);
6762 return (err
== BTRACE_ERR_NONE
? 0 : -1);
6765 /* Encode an Intel(R) Processor Trace configuration. */
6768 linux_low_encode_pt_config (struct buffer
*buffer
,
6769 const struct btrace_data_pt_config
*config
)
6771 buffer_grow_str (buffer
, "<pt-config>\n");
6773 switch (config
->cpu
.vendor
)
6776 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
6777 "model=\"%u\" stepping=\"%u\"/>\n",
6778 config
->cpu
.family
, config
->cpu
.model
,
6779 config
->cpu
.stepping
);
6786 buffer_grow_str (buffer
, "</pt-config>\n");
6789 /* Encode a raw buffer. */
6792 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
6798 /* We use hex encoding - see common/rsp-low.h. */
6799 buffer_grow_str (buffer
, "<raw>\n");
6805 elem
[0] = tohex ((*data
>> 4) & 0xf);
6806 elem
[1] = tohex (*data
++ & 0xf);
6808 buffer_grow (buffer
, elem
, 2);
6811 buffer_grow_str (buffer
, "</raw>\n");
6814 /* See to_read_btrace target method. */
6817 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
6818 enum btrace_read_type type
)
6820 struct btrace_data btrace
;
6821 struct btrace_block
*block
;
6822 enum btrace_error err
;
6825 btrace_data_init (&btrace
);
6827 err
= linux_read_btrace (&btrace
, tinfo
, type
);
6828 if (err
!= BTRACE_ERR_NONE
)
6830 if (err
== BTRACE_ERR_OVERFLOW
)
6831 buffer_grow_str0 (buffer
, "E.Overflow.");
6833 buffer_grow_str0 (buffer
, "E.Generic Error.");
6838 switch (btrace
.format
)
6840 case BTRACE_FORMAT_NONE
:
6841 buffer_grow_str0 (buffer
, "E.No Trace.");
6844 case BTRACE_FORMAT_BTS
:
6845 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
6846 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
6849 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
6851 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
6852 paddress (block
->begin
), paddress (block
->end
));
6854 buffer_grow_str0 (buffer
, "</btrace>\n");
6857 case BTRACE_FORMAT_PT
:
6858 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
6859 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
6860 buffer_grow_str (buffer
, "<pt>\n");
6862 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
6864 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
6865 btrace
.variant
.pt
.size
);
6867 buffer_grow_str (buffer
, "</pt>\n");
6868 buffer_grow_str0 (buffer
, "</btrace>\n");
6872 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
6876 btrace_data_fini (&btrace
);
6880 btrace_data_fini (&btrace
);
6884 /* See to_btrace_conf target method. */
6887 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
6888 struct buffer
*buffer
)
6890 const struct btrace_config
*conf
;
6892 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
6893 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
6895 conf
= linux_btrace_conf (tinfo
);
6898 switch (conf
->format
)
6900 case BTRACE_FORMAT_NONE
:
6903 case BTRACE_FORMAT_BTS
:
6904 buffer_xml_printf (buffer
, "<bts");
6905 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
6906 buffer_xml_printf (buffer
, " />\n");
6909 case BTRACE_FORMAT_PT
:
6910 buffer_xml_printf (buffer
, "<pt");
6911 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
6912 buffer_xml_printf (buffer
, "/>\n");
6917 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
6920 #endif /* HAVE_LINUX_BTRACE */
6922 /* See nat/linux-nat.h. */
6925 current_lwp_ptid (void)
6927 return ptid_of (current_thread
);
6930 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
6933 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
6935 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
6936 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
6938 return default_breakpoint_kind_from_pc (pcptr
);
6941 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
6943 static const gdb_byte
*
6944 linux_sw_breakpoint_from_kind (int kind
, int *size
)
6946 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
6948 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
6951 static struct target_ops linux_target_ops
= {
6952 linux_create_inferior
,
6962 linux_fetch_registers
,
6963 linux_store_registers
,
6964 linux_prepare_to_access_memory
,
6965 linux_done_accessing_memory
,
6968 linux_look_up_symbols
,
6969 linux_request_interrupt
,
6971 linux_supports_z_point_type
,
6974 linux_stopped_by_sw_breakpoint
,
6975 linux_supports_stopped_by_sw_breakpoint
,
6976 linux_stopped_by_hw_breakpoint
,
6977 linux_supports_stopped_by_hw_breakpoint
,
6978 linux_supports_hardware_single_step
,
6979 linux_stopped_by_watchpoint
,
6980 linux_stopped_data_address
,
6981 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6982 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6983 && defined(PT_TEXT_END_ADDR)
6988 #ifdef USE_THREAD_DB
6989 thread_db_get_tls_address
,
6994 hostio_last_error_from_errno
,
6997 linux_supports_non_stop
,
6999 linux_start_non_stop
,
7000 linux_supports_multi_process
,
7001 linux_supports_fork_events
,
7002 linux_supports_vfork_events
,
7003 linux_supports_exec_events
,
7004 linux_handle_new_gdb_connection
,
7005 #ifdef USE_THREAD_DB
7006 thread_db_handle_monitor_command
,
7010 linux_common_core_of_thread
,
7012 linux_process_qsupported
,
7013 linux_supports_tracepoints
,
7016 linux_thread_stopped
,
7020 linux_stabilize_threads
,
7021 linux_install_fast_tracepoint_jump_pad
,
7023 linux_supports_disable_randomization
,
7024 linux_get_min_fast_tracepoint_insn_len
,
7025 linux_qxfer_libraries_svr4
,
7026 linux_supports_agent
,
7027 #ifdef HAVE_LINUX_BTRACE
7028 linux_supports_btrace
,
7029 linux_enable_btrace
,
7030 linux_low_disable_btrace
,
7031 linux_low_read_btrace
,
7032 linux_low_btrace_conf
,
7040 linux_supports_range_stepping
,
7041 linux_proc_pid_to_exec_file
,
7042 linux_mntns_open_cloexec
,
7044 linux_mntns_readlink
,
7045 linux_breakpoint_kind_from_pc
,
7046 linux_sw_breakpoint_from_kind
7050 linux_init_signals ()
7052 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
7053 to find what the cancel signal actually is. */
7054 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
7055 signal (__SIGRTMIN
+1, SIG_IGN
);
7059 #ifdef HAVE_LINUX_REGSETS
7061 initialize_regsets_info (struct regsets_info
*info
)
7063 for (info
->num_regsets
= 0;
7064 info
->regsets
[info
->num_regsets
].size
>= 0;
7065 info
->num_regsets
++)
7071 initialize_low (void)
7073 struct sigaction sigchld_action
;
7075 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7076 set_target_ops (&linux_target_ops
);
7078 linux_init_signals ();
7079 linux_ptrace_init_warnings ();
7081 sigchld_action
.sa_handler
= sigchld_handler
;
7082 sigemptyset (&sigchld_action
.sa_mask
);
7083 sigchld_action
.sa_flags
= SA_RESTART
;
7084 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7086 initialize_low_arch ();
7088 linux_check_ptrace_features ();