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
74 #define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
77 /* This is the kernel's hard limit. Not to be confused with
83 /* Some targets did not define these ptrace constants from the start,
84 so gdbserver defines them locally here. In the future, these may
85 be removed after they are added to asm/ptrace.h. */
86 #if !(defined(PT_TEXT_ADDR) \
87 || defined(PT_DATA_ADDR) \
88 || defined(PT_TEXT_END_ADDR))
89 #if defined(__mcoldfire__)
90 /* These are still undefined in 3.10 kernels. */
91 #define PT_TEXT_ADDR 49*4
92 #define PT_DATA_ADDR 50*4
93 #define PT_TEXT_END_ADDR 51*4
94 /* BFIN already defines these since at least 2.6.32 kernels. */
96 #define PT_TEXT_ADDR 220
97 #define PT_TEXT_END_ADDR 224
98 #define PT_DATA_ADDR 228
99 /* These are still undefined in 3.10 kernels. */
100 #elif defined(__TMS320C6X__)
101 #define PT_TEXT_ADDR (0x10000*4)
102 #define PT_DATA_ADDR (0x10004*4)
103 #define PT_TEXT_END_ADDR (0x10008*4)
107 #ifdef HAVE_LINUX_BTRACE
108 # include "nat/linux-btrace.h"
109 # include "btrace-common.h"
112 #ifndef HAVE_ELF32_AUXV_T
113 /* Copied from glibc's elf.h. */
116 uint32_t a_type
; /* Entry type */
119 uint32_t a_val
; /* Integer value */
120 /* We use to have pointer elements added here. We cannot do that,
121 though, since it does not work when using 32-bit definitions
122 on 64-bit platforms and vice versa. */
127 #ifndef HAVE_ELF64_AUXV_T
128 /* Copied from glibc's elf.h. */
131 uint64_t a_type
; /* Entry type */
134 uint64_t a_val
; /* Integer value */
135 /* We use to have pointer elements added here. We cannot do that,
136 though, since it does not work when using 32-bit definitions
137 on 64-bit platforms and vice versa. */
142 /* Does the current host support PTRACE_GETREGSET? */
143 int have_ptrace_getregset
= -1;
147 /* See nat/linux-nat.h. */
150 ptid_of_lwp (struct lwp_info
*lwp
)
152 return ptid_of (get_lwp_thread (lwp
));
155 /* See nat/linux-nat.h. */
158 lwp_set_arch_private_info (struct lwp_info
*lwp
,
159 struct arch_lwp_info
*info
)
161 lwp
->arch_private
= info
;
164 /* See nat/linux-nat.h. */
166 struct arch_lwp_info
*
167 lwp_arch_private_info (struct lwp_info
*lwp
)
169 return lwp
->arch_private
;
172 /* See nat/linux-nat.h. */
175 lwp_is_stopped (struct lwp_info
*lwp
)
180 /* See nat/linux-nat.h. */
182 enum target_stop_reason
183 lwp_stop_reason (struct lwp_info
*lwp
)
185 return lwp
->stop_reason
;
188 /* A list of all unknown processes which receive stop signals. Some
189 other process will presumably claim each of these as forked
190 children momentarily. */
192 struct simple_pid_list
194 /* The process ID. */
197 /* The status as reported by waitpid. */
201 struct simple_pid_list
*next
;
203 struct simple_pid_list
*stopped_pids
;
205 /* Trivial list manipulation functions to keep track of a list of new
206 stopped processes. */
209 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
211 struct simple_pid_list
*new_pid
= XNEW (struct simple_pid_list
);
214 new_pid
->status
= status
;
215 new_pid
->next
= *listp
;
220 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
222 struct simple_pid_list
**p
;
224 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
225 if ((*p
)->pid
== pid
)
227 struct simple_pid_list
*next
= (*p
)->next
;
229 *statusp
= (*p
)->status
;
237 enum stopping_threads_kind
239 /* Not stopping threads presently. */
240 NOT_STOPPING_THREADS
,
242 /* Stopping threads. */
245 /* Stopping and suspending threads. */
246 STOPPING_AND_SUSPENDING_THREADS
249 /* This is set while stop_all_lwps is in effect. */
250 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
252 /* FIXME make into a target method? */
253 int using_threads
= 1;
255 /* True if we're presently stabilizing threads (moving them out of
257 static int stabilizing_threads
;
259 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
260 int step
, int signal
, siginfo_t
*info
);
261 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
262 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
263 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
264 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
265 int *wstat
, int options
);
266 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
267 static struct lwp_info
*add_lwp (ptid_t ptid
);
268 static void linux_mourn (struct process_info
*process
);
269 static int linux_stopped_by_watchpoint (void);
270 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
271 static int lwp_is_marked_dead (struct lwp_info
*lwp
);
272 static void proceed_all_lwps (void);
273 static int finish_step_over (struct lwp_info
*lwp
);
274 static int kill_lwp (unsigned long lwpid
, int signo
);
275 static void enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
);
276 static void complete_ongoing_step_over (void);
278 /* When the event-loop is doing a step-over, this points at the thread
280 ptid_t step_over_bkpt
;
282 /* True if the low target can hardware single-step. Such targets
283 don't need a BREAKPOINT_REINSERT_ADDR callback. */
286 can_hardware_single_step (void)
288 return (the_low_target
.breakpoint_reinsert_addr
== NULL
);
291 /* True if the low target supports memory breakpoints. If so, we'll
292 have a GET_PC implementation. */
295 supports_breakpoints (void)
297 return (the_low_target
.get_pc
!= NULL
);
300 /* Returns true if this target can support fast tracepoints. This
301 does not mean that the in-process agent has been loaded in the
305 supports_fast_tracepoints (void)
307 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
310 /* True if LWP is stopped in its stepping range. */
313 lwp_in_step_range (struct lwp_info
*lwp
)
315 CORE_ADDR pc
= lwp
->stop_pc
;
317 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
320 struct pending_signals
324 struct pending_signals
*prev
;
327 /* The read/write ends of the pipe registered as waitable file in the
329 static int linux_event_pipe
[2] = { -1, -1 };
331 /* True if we're currently in async mode. */
332 #define target_is_async_p() (linux_event_pipe[0] != -1)
334 static void send_sigstop (struct lwp_info
*lwp
);
335 static void wait_for_sigstop (void);
337 /* Return non-zero if HEADER is a 64-bit ELF file. */
340 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
342 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
343 && header
->e_ident
[EI_MAG1
] == ELFMAG1
344 && header
->e_ident
[EI_MAG2
] == ELFMAG2
345 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
347 *machine
= header
->e_machine
;
348 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
355 /* Return non-zero if FILE is a 64-bit ELF file,
356 zero if the file is not a 64-bit ELF file,
357 and -1 if the file is not accessible or doesn't exist. */
360 elf_64_file_p (const char *file
, unsigned int *machine
)
365 fd
= open (file
, O_RDONLY
);
369 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
376 return elf_64_header_p (&header
, machine
);
379 /* Accepts an integer PID; Returns true if the executable PID is
380 running is a 64-bit ELF file.. */
383 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
387 sprintf (file
, "/proc/%d/exe", pid
);
388 return elf_64_file_p (file
, machine
);
392 delete_lwp (struct lwp_info
*lwp
)
394 struct thread_info
*thr
= get_lwp_thread (lwp
);
397 debug_printf ("deleting %ld\n", lwpid_of (thr
));
400 free (lwp
->arch_private
);
404 /* Add a process to the common process list, and set its private
407 static struct process_info
*
408 linux_add_process (int pid
, int attached
)
410 struct process_info
*proc
;
412 proc
= add_process (pid
, attached
);
413 proc
->priv
= XCNEW (struct process_info_private
);
415 if (the_low_target
.new_process
!= NULL
)
416 proc
->priv
->arch_private
= the_low_target
.new_process ();
421 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
423 /* Implement the arch_setup target_ops method. */
426 linux_arch_setup (void)
428 the_low_target
.arch_setup ();
431 /* Call the target arch_setup function on THREAD. */
434 linux_arch_setup_thread (struct thread_info
*thread
)
436 struct thread_info
*saved_thread
;
438 saved_thread
= current_thread
;
439 current_thread
= thread
;
443 current_thread
= saved_thread
;
446 /* Handle a GNU/Linux extended wait response. If we see a clone,
447 fork, or vfork event, we need to add the new LWP to our list
448 (and return 0 so as not to report the trap to higher layers).
449 If we see an exec event, we will modify ORIG_EVENT_LWP to point
450 to a new LWP representing the new program. */
453 handle_extended_wait (struct lwp_info
**orig_event_lwp
, int wstat
)
455 struct lwp_info
*event_lwp
= *orig_event_lwp
;
456 int event
= linux_ptrace_get_extended_event (wstat
);
457 struct thread_info
*event_thr
= get_lwp_thread (event_lwp
);
458 struct lwp_info
*new_lwp
;
460 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
461 || (event
== PTRACE_EVENT_CLONE
))
464 unsigned long new_pid
;
467 /* Get the pid of the new lwp. */
468 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
471 /* If we haven't already seen the new PID stop, wait for it now. */
472 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
474 /* The new child has a pending SIGSTOP. We can't affect it until it
475 hits the SIGSTOP, but we're already attached. */
477 ret
= my_waitpid (new_pid
, &status
, __WALL
);
480 perror_with_name ("waiting for new child");
481 else if (ret
!= new_pid
)
482 warning ("wait returned unexpected PID %d", ret
);
483 else if (!WIFSTOPPED (status
))
484 warning ("wait returned unexpected status 0x%x", status
);
487 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
489 struct process_info
*parent_proc
;
490 struct process_info
*child_proc
;
491 struct lwp_info
*child_lwp
;
492 struct thread_info
*child_thr
;
493 struct target_desc
*tdesc
;
495 ptid
= ptid_build (new_pid
, new_pid
, 0);
499 debug_printf ("HEW: Got fork event from LWP %ld, "
501 ptid_get_lwp (ptid_of (event_thr
)),
502 ptid_get_pid (ptid
));
505 /* Add the new process to the tables and clone the breakpoint
506 lists of the parent. We need to do this even if the new process
507 will be detached, since we will need the process object and the
508 breakpoints to remove any breakpoints from memory when we
509 detach, and the client side will access registers. */
510 child_proc
= linux_add_process (new_pid
, 0);
511 gdb_assert (child_proc
!= NULL
);
512 child_lwp
= add_lwp (ptid
);
513 gdb_assert (child_lwp
!= NULL
);
514 child_lwp
->stopped
= 1;
515 child_lwp
->must_set_ptrace_flags
= 1;
516 child_lwp
->status_pending_p
= 0;
517 child_thr
= get_lwp_thread (child_lwp
);
518 child_thr
->last_resume_kind
= resume_stop
;
519 child_thr
->last_status
.kind
= TARGET_WAITKIND_STOPPED
;
521 /* If we're suspending all threads, leave this one suspended
523 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
)
526 debug_printf ("HEW: leaving child suspended\n");
527 child_lwp
->suspended
= 1;
530 parent_proc
= get_thread_process (event_thr
);
531 child_proc
->attached
= parent_proc
->attached
;
532 clone_all_breakpoints (&child_proc
->breakpoints
,
533 &child_proc
->raw_breakpoints
,
534 parent_proc
->breakpoints
);
536 tdesc
= XNEW (struct target_desc
);
537 copy_target_description (tdesc
, parent_proc
->tdesc
);
538 child_proc
->tdesc
= tdesc
;
540 /* Clone arch-specific process data. */
541 if (the_low_target
.new_fork
!= NULL
)
542 the_low_target
.new_fork (parent_proc
, child_proc
);
544 /* Save fork info in the parent thread. */
545 if (event
== PTRACE_EVENT_FORK
)
546 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
547 else if (event
== PTRACE_EVENT_VFORK
)
548 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
550 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
552 /* The status_pending field contains bits denoting the
553 extended event, so when the pending event is handled,
554 the handler will look at lwp->waitstatus. */
555 event_lwp
->status_pending_p
= 1;
556 event_lwp
->status_pending
= wstat
;
558 /* Report the event. */
563 debug_printf ("HEW: Got clone event "
564 "from LWP %ld, new child is LWP %ld\n",
565 lwpid_of (event_thr
), new_pid
);
567 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
568 new_lwp
= add_lwp (ptid
);
570 /* Either we're going to immediately resume the new thread
571 or leave it stopped. linux_resume_one_lwp is a nop if it
572 thinks the thread is currently running, so set this first
573 before calling linux_resume_one_lwp. */
574 new_lwp
->stopped
= 1;
576 /* If we're suspending all threads, leave this one suspended
578 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
)
579 new_lwp
->suspended
= 1;
581 /* Normally we will get the pending SIGSTOP. But in some cases
582 we might get another signal delivered to the group first.
583 If we do get another signal, be sure not to lose it. */
584 if (WSTOPSIG (status
) != SIGSTOP
)
586 new_lwp
->stop_expected
= 1;
587 new_lwp
->status_pending_p
= 1;
588 new_lwp
->status_pending
= status
;
591 /* Don't report the event. */
594 else if (event
== PTRACE_EVENT_VFORK_DONE
)
596 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
598 /* Report the event. */
601 else if (event
== PTRACE_EVENT_EXEC
&& report_exec_events
)
603 struct process_info
*proc
;
609 debug_printf ("HEW: Got exec event from LWP %ld\n",
610 lwpid_of (event_thr
));
613 /* Get the event ptid. */
614 event_ptid
= ptid_of (event_thr
);
615 event_pid
= ptid_get_pid (event_ptid
);
617 /* Delete the execing process and all its threads. */
618 proc
= get_thread_process (event_thr
);
620 current_thread
= NULL
;
622 /* Create a new process/lwp/thread. */
623 proc
= linux_add_process (event_pid
, 0);
624 event_lwp
= add_lwp (event_ptid
);
625 event_thr
= get_lwp_thread (event_lwp
);
626 gdb_assert (current_thread
== event_thr
);
627 linux_arch_setup_thread (event_thr
);
629 /* Set the event status. */
630 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXECD
;
631 event_lwp
->waitstatus
.value
.execd_pathname
632 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr
)));
634 /* Mark the exec status as pending. */
635 event_lwp
->stopped
= 1;
636 event_lwp
->status_pending_p
= 1;
637 event_lwp
->status_pending
= wstat
;
638 event_thr
->last_resume_kind
= resume_continue
;
639 event_thr
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
641 /* Report the event. */
642 *orig_event_lwp
= event_lwp
;
646 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
649 /* Return the PC as read from the regcache of LWP, without any
653 get_pc (struct lwp_info
*lwp
)
655 struct thread_info
*saved_thread
;
656 struct regcache
*regcache
;
659 if (the_low_target
.get_pc
== NULL
)
662 saved_thread
= current_thread
;
663 current_thread
= get_lwp_thread (lwp
);
665 regcache
= get_thread_regcache (current_thread
, 1);
666 pc
= (*the_low_target
.get_pc
) (regcache
);
669 debug_printf ("pc is 0x%lx\n", (long) pc
);
671 current_thread
= saved_thread
;
675 /* This function should only be called if LWP got a SIGTRAP.
676 The SIGTRAP could mean several things.
678 On i386, where decr_pc_after_break is non-zero:
680 If we were single-stepping this process using PTRACE_SINGLESTEP, we
681 will get only the one SIGTRAP. The value of $eip will be the next
682 instruction. If the instruction we stepped over was a breakpoint,
683 we need to decrement the PC.
685 If we continue the process using PTRACE_CONT, we will get a
686 SIGTRAP when we hit a breakpoint. The value of $eip will be
687 the instruction after the breakpoint (i.e. needs to be
688 decremented). If we report the SIGTRAP to GDB, we must also
689 report the undecremented PC. If the breakpoint is removed, we
690 must resume at the decremented PC.
692 On a non-decr_pc_after_break machine with hardware or kernel
695 If we either single-step a breakpoint instruction, or continue and
696 hit a breakpoint instruction, our PC will point at the breakpoint
700 check_stopped_by_breakpoint (struct lwp_info
*lwp
)
703 CORE_ADDR sw_breakpoint_pc
;
704 struct thread_info
*saved_thread
;
705 #if USE_SIGTRAP_SIGINFO
709 if (the_low_target
.get_pc
== NULL
)
713 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
715 /* breakpoint_at reads from the current thread. */
716 saved_thread
= current_thread
;
717 current_thread
= get_lwp_thread (lwp
);
719 #if USE_SIGTRAP_SIGINFO
720 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
721 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
723 if (siginfo
.si_signo
== SIGTRAP
)
725 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo
.si_code
))
729 struct thread_info
*thr
= get_lwp_thread (lwp
);
731 debug_printf ("CSBB: %s stopped by software breakpoint\n",
732 target_pid_to_str (ptid_of (thr
)));
735 /* Back up the PC if necessary. */
736 if (pc
!= sw_breakpoint_pc
)
738 struct regcache
*regcache
739 = get_thread_regcache (current_thread
, 1);
740 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
743 lwp
->stop_pc
= sw_breakpoint_pc
;
744 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
745 current_thread
= saved_thread
;
748 else if (siginfo
.si_code
== TRAP_HWBKPT
)
752 struct thread_info
*thr
= get_lwp_thread (lwp
);
754 debug_printf ("CSBB: %s stopped by hardware "
755 "breakpoint/watchpoint\n",
756 target_pid_to_str (ptid_of (thr
)));
760 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
761 current_thread
= saved_thread
;
764 else if (siginfo
.si_code
== TRAP_TRACE
)
768 struct thread_info
*thr
= get_lwp_thread (lwp
);
770 debug_printf ("CSBB: %s stopped by trace\n",
771 target_pid_to_str (ptid_of (thr
)));
774 lwp
->stop_reason
= TARGET_STOPPED_BY_SINGLE_STEP
;
779 /* We may have just stepped a breakpoint instruction. E.g., in
780 non-stop mode, GDB first tells the thread A to step a range, and
781 then the user inserts a breakpoint inside the range. In that
782 case we need to report the breakpoint PC. */
783 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
784 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
788 struct thread_info
*thr
= get_lwp_thread (lwp
);
790 debug_printf ("CSBB: %s stopped by software breakpoint\n",
791 target_pid_to_str (ptid_of (thr
)));
794 /* Back up the PC if necessary. */
795 if (pc
!= sw_breakpoint_pc
)
797 struct regcache
*regcache
798 = get_thread_regcache (current_thread
, 1);
799 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
802 lwp
->stop_pc
= sw_breakpoint_pc
;
803 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
804 current_thread
= saved_thread
;
808 if (hardware_breakpoint_inserted_here (pc
))
812 struct thread_info
*thr
= get_lwp_thread (lwp
);
814 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
815 target_pid_to_str (ptid_of (thr
)));
819 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
820 current_thread
= saved_thread
;
825 current_thread
= saved_thread
;
829 static struct lwp_info
*
830 add_lwp (ptid_t ptid
)
832 struct lwp_info
*lwp
;
834 lwp
= XCNEW (struct lwp_info
);
836 lwp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
838 if (the_low_target
.new_thread
!= NULL
)
839 the_low_target
.new_thread (lwp
);
841 lwp
->thread
= add_thread (ptid
, lwp
);
846 /* Start an inferior process and returns its pid.
847 ALLARGS is a vector of program-name and args. */
850 linux_create_inferior (char *program
, char **allargs
)
852 struct lwp_info
*new_lwp
;
855 struct cleanup
*restore_personality
856 = maybe_disable_address_space_randomization (disable_randomization
);
858 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
864 perror_with_name ("fork");
869 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
871 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
872 signal (__SIGRTMIN
+ 1, SIG_DFL
);
877 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
878 stdout to stderr so that inferior i/o doesn't corrupt the connection.
879 Also, redirect stdin to /dev/null. */
880 if (remote_connection_is_stdio ())
883 open ("/dev/null", O_RDONLY
);
885 if (write (2, "stdin/stdout redirected\n",
886 sizeof ("stdin/stdout redirected\n") - 1) < 0)
888 /* Errors ignored. */;
892 execv (program
, allargs
);
894 execvp (program
, allargs
);
896 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
902 do_cleanups (restore_personality
);
904 linux_add_process (pid
, 0);
906 ptid
= ptid_build (pid
, pid
, 0);
907 new_lwp
= add_lwp (ptid
);
908 new_lwp
->must_set_ptrace_flags
= 1;
913 /* Attach to an inferior process. Returns 0 on success, ERRNO on
917 linux_attach_lwp (ptid_t ptid
)
919 struct lwp_info
*new_lwp
;
920 int lwpid
= ptid_get_lwp (ptid
);
922 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
926 new_lwp
= add_lwp (ptid
);
928 /* We need to wait for SIGSTOP before being able to make the next
929 ptrace call on this LWP. */
930 new_lwp
->must_set_ptrace_flags
= 1;
932 if (linux_proc_pid_is_stopped (lwpid
))
935 debug_printf ("Attached to a stopped process\n");
937 /* The process is definitely stopped. It is in a job control
938 stop, unless the kernel predates the TASK_STOPPED /
939 TASK_TRACED distinction, in which case it might be in a
940 ptrace stop. Make sure it is in a ptrace stop; from there we
941 can kill it, signal it, et cetera.
943 First make sure there is a pending SIGSTOP. Since we are
944 already attached, the process can not transition from stopped
945 to running without a PTRACE_CONT; so we know this signal will
946 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
947 probably already in the queue (unless this kernel is old
948 enough to use TASK_STOPPED for ptrace stops); but since
949 SIGSTOP is not an RT signal, it can only be queued once. */
950 kill_lwp (lwpid
, SIGSTOP
);
952 /* Finally, resume the stopped process. This will deliver the
953 SIGSTOP (or a higher priority signal, just like normal
954 PTRACE_ATTACH), which we'll catch later on. */
955 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
958 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
961 There are several cases to consider here:
963 1) gdbserver has already attached to the process and is being notified
964 of a new thread that is being created.
965 In this case we should ignore that SIGSTOP and resume the
966 process. This is handled below by setting stop_expected = 1,
967 and the fact that add_thread sets last_resume_kind ==
970 2) This is the first thread (the process thread), and we're attaching
971 to it via attach_inferior.
972 In this case we want the process thread to stop.
973 This is handled by having linux_attach set last_resume_kind ==
974 resume_stop after we return.
976 If the pid we are attaching to is also the tgid, we attach to and
977 stop all the existing threads. Otherwise, we attach to pid and
978 ignore any other threads in the same group as this pid.
980 3) GDB is connecting to gdbserver and is requesting an enumeration of all
982 In this case we want the thread to stop.
983 FIXME: This case is currently not properly handled.
984 We should wait for the SIGSTOP but don't. Things work apparently
985 because enough time passes between when we ptrace (ATTACH) and when
986 gdb makes the next ptrace call on the thread.
988 On the other hand, if we are currently trying to stop all threads, we
989 should treat the new thread as if we had sent it a SIGSTOP. This works
990 because we are guaranteed that the add_lwp call above added us to the
991 end of the list, and so the new thread has not yet reached
992 wait_for_sigstop (but will). */
993 new_lwp
->stop_expected
= 1;
998 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
999 already attached. Returns true if a new LWP is found, false
1003 attach_proc_task_lwp_callback (ptid_t ptid
)
1005 /* Is this a new thread? */
1006 if (find_thread_ptid (ptid
) == NULL
)
1008 int lwpid
= ptid_get_lwp (ptid
);
1012 debug_printf ("Found new lwp %d\n", lwpid
);
1014 err
= linux_attach_lwp (ptid
);
1016 /* Be quiet if we simply raced with the thread exiting. EPERM
1017 is returned if the thread's task still exists, and is marked
1018 as exited or zombie, as well as other conditions, so in that
1019 case, confirm the status in /proc/PID/status. */
1021 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
1025 debug_printf ("Cannot attach to lwp %d: "
1026 "thread is gone (%d: %s)\n",
1027 lwpid
, err
, strerror (err
));
1032 warning (_("Cannot attach to lwp %d: %s"),
1034 linux_ptrace_attach_fail_reason_string (ptid
, err
));
1042 /* Attach to PID. If PID is the tgid, attach to it and all
1046 linux_attach (unsigned long pid
)
1048 ptid_t ptid
= ptid_build (pid
, pid
, 0);
1051 /* Attach to PID. We will check for other threads
1053 err
= linux_attach_lwp (ptid
);
1055 error ("Cannot attach to process %ld: %s",
1056 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
1058 linux_add_process (pid
, 1);
1062 struct thread_info
*thread
;
1064 /* Don't ignore the initial SIGSTOP if we just attached to this
1065 process. It will be collected by wait shortly. */
1066 thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
1067 thread
->last_resume_kind
= resume_stop
;
1070 /* We must attach to every LWP. If /proc is mounted, use that to
1071 find them now. On the one hand, the inferior may be using raw
1072 clone instead of using pthreads. On the other hand, even if it
1073 is using pthreads, GDB may not be connected yet (thread_db needs
1074 to do symbol lookups, through qSymbol). Also, thread_db walks
1075 structures in the inferior's address space to find the list of
1076 threads/LWPs, and those structures may well be corrupted. Note
1077 that once thread_db is loaded, we'll still use it to list threads
1078 and associate pthread info with each LWP. */
1079 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1090 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
1092 struct counter
*counter
= (struct counter
*) args
;
1094 if (ptid_get_pid (entry
->id
) == counter
->pid
)
1096 if (++counter
->count
> 1)
1104 last_thread_of_process_p (int pid
)
1106 struct counter counter
= { pid
, 0 };
1108 return (find_inferior (&all_threads
,
1109 second_thread_of_pid_p
, &counter
) == NULL
);
1115 linux_kill_one_lwp (struct lwp_info
*lwp
)
1117 struct thread_info
*thr
= get_lwp_thread (lwp
);
1118 int pid
= lwpid_of (thr
);
1120 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1121 there is no signal context, and ptrace(PTRACE_KILL) (or
1122 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1123 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1124 alternative is to kill with SIGKILL. We only need one SIGKILL
1125 per process, not one for each thread. But since we still support
1126 linuxthreads, and we also support debugging programs using raw
1127 clone without CLONE_THREAD, we send one for each thread. For
1128 years, we used PTRACE_KILL only, so we're being a bit paranoid
1129 about some old kernels where PTRACE_KILL might work better
1130 (dubious if there are any such, but that's why it's paranoia), so
1131 we try SIGKILL first, PTRACE_KILL second, and so we're fine
1135 kill_lwp (pid
, SIGKILL
);
1138 int save_errno
= errno
;
1140 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1141 target_pid_to_str (ptid_of (thr
)),
1142 save_errno
? strerror (save_errno
) : "OK");
1146 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1149 int save_errno
= errno
;
1151 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1152 target_pid_to_str (ptid_of (thr
)),
1153 save_errno
? strerror (save_errno
) : "OK");
1157 /* Kill LWP and wait for it to die. */
1160 kill_wait_lwp (struct lwp_info
*lwp
)
1162 struct thread_info
*thr
= get_lwp_thread (lwp
);
1163 int pid
= ptid_get_pid (ptid_of (thr
));
1164 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1169 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1173 linux_kill_one_lwp (lwp
);
1175 /* Make sure it died. Notes:
1177 - The loop is most likely unnecessary.
1179 - We don't use linux_wait_for_event as that could delete lwps
1180 while we're iterating over them. We're not interested in
1181 any pending status at this point, only in making sure all
1182 wait status on the kernel side are collected until the
1185 - We don't use __WALL here as the __WALL emulation relies on
1186 SIGCHLD, and killing a stopped process doesn't generate
1187 one, nor an exit status.
1189 res
= my_waitpid (lwpid
, &wstat
, 0);
1190 if (res
== -1 && errno
== ECHILD
)
1191 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1192 } while (res
> 0 && WIFSTOPPED (wstat
));
1194 /* Even if it was stopped, the child may have already disappeared.
1195 E.g., if it was killed by SIGKILL. */
1196 if (res
< 0 && errno
!= ECHILD
)
1197 perror_with_name ("kill_wait_lwp");
1200 /* Callback for `find_inferior'. Kills an lwp of a given process,
1201 except the leader. */
1204 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1206 struct thread_info
*thread
= (struct thread_info
*) entry
;
1207 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1208 int pid
= * (int *) args
;
1210 if (ptid_get_pid (entry
->id
) != pid
)
1213 /* We avoid killing the first thread here, because of a Linux kernel (at
1214 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1215 the children get a chance to be reaped, it will remain a zombie
1218 if (lwpid_of (thread
) == pid
)
1221 debug_printf ("lkop: is last of process %s\n",
1222 target_pid_to_str (entry
->id
));
1226 kill_wait_lwp (lwp
);
1231 linux_kill (int pid
)
1233 struct process_info
*process
;
1234 struct lwp_info
*lwp
;
1236 process
= find_process_pid (pid
);
1237 if (process
== NULL
)
1240 /* If we're killing a running inferior, make sure it is stopped
1241 first, as PTRACE_KILL will not work otherwise. */
1242 stop_all_lwps (0, NULL
);
1244 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1246 /* See the comment in linux_kill_one_lwp. We did not kill the first
1247 thread in the list, so do so now. */
1248 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1253 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1257 kill_wait_lwp (lwp
);
1259 the_target
->mourn (process
);
1261 /* Since we presently can only stop all lwps of all processes, we
1262 need to unstop lwps of other processes. */
1263 unstop_all_lwps (0, NULL
);
1267 /* Get pending signal of THREAD, for detaching purposes. This is the
1268 signal the thread last stopped for, which we need to deliver to the
1269 thread when detaching, otherwise, it'd be suppressed/lost. */
1272 get_detach_signal (struct thread_info
*thread
)
1274 enum gdb_signal signo
= GDB_SIGNAL_0
;
1276 struct lwp_info
*lp
= get_thread_lwp (thread
);
1278 if (lp
->status_pending_p
)
1279 status
= lp
->status_pending
;
1282 /* If the thread had been suspended by gdbserver, and it stopped
1283 cleanly, then it'll have stopped with SIGSTOP. But we don't
1284 want to deliver that SIGSTOP. */
1285 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1286 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1289 /* Otherwise, we may need to deliver the signal we
1291 status
= lp
->last_status
;
1294 if (!WIFSTOPPED (status
))
1297 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1298 target_pid_to_str (ptid_of (thread
)));
1302 /* Extended wait statuses aren't real SIGTRAPs. */
1303 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1306 debug_printf ("GPS: lwp %s had stopped with extended "
1307 "status: no pending signal\n",
1308 target_pid_to_str (ptid_of (thread
)));
1312 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1314 if (program_signals_p
&& !program_signals
[signo
])
1317 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1318 target_pid_to_str (ptid_of (thread
)),
1319 gdb_signal_to_string (signo
));
1322 else if (!program_signals_p
1323 /* If we have no way to know which signals GDB does not
1324 want to have passed to the program, assume
1325 SIGTRAP/SIGINT, which is GDB's default. */
1326 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1329 debug_printf ("GPS: lwp %s had signal %s, "
1330 "but we don't know if we should pass it. "
1331 "Default to not.\n",
1332 target_pid_to_str (ptid_of (thread
)),
1333 gdb_signal_to_string (signo
));
1339 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1340 target_pid_to_str (ptid_of (thread
)),
1341 gdb_signal_to_string (signo
));
1343 return WSTOPSIG (status
);
1348 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
1350 struct thread_info
*thread
= (struct thread_info
*) entry
;
1351 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1352 int pid
= * (int *) args
;
1355 if (ptid_get_pid (entry
->id
) != pid
)
1358 /* If there is a pending SIGSTOP, get rid of it. */
1359 if (lwp
->stop_expected
)
1362 debug_printf ("Sending SIGCONT to %s\n",
1363 target_pid_to_str (ptid_of (thread
)));
1365 kill_lwp (lwpid_of (thread
), SIGCONT
);
1366 lwp
->stop_expected
= 0;
1369 /* Flush any pending changes to the process's registers. */
1370 regcache_invalidate_thread (thread
);
1372 /* Pass on any pending signal for this thread. */
1373 sig
= get_detach_signal (thread
);
1375 /* Finally, let it resume. */
1376 if (the_low_target
.prepare_to_resume
!= NULL
)
1377 the_low_target
.prepare_to_resume (lwp
);
1378 if (ptrace (PTRACE_DETACH
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1379 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1380 error (_("Can't detach %s: %s"),
1381 target_pid_to_str (ptid_of (thread
)),
1389 linux_detach (int pid
)
1391 struct process_info
*process
;
1393 process
= find_process_pid (pid
);
1394 if (process
== NULL
)
1397 /* As there's a step over already in progress, let it finish first,
1398 otherwise nesting a stabilize_threads operation on top gets real
1400 complete_ongoing_step_over ();
1402 /* Stop all threads before detaching. First, ptrace requires that
1403 the thread is stopped to sucessfully detach. Second, thread_db
1404 may need to uninstall thread event breakpoints from memory, which
1405 only works with a stopped process anyway. */
1406 stop_all_lwps (0, NULL
);
1408 #ifdef USE_THREAD_DB
1409 thread_db_detach (process
);
1412 /* Stabilize threads (move out of jump pads). */
1413 stabilize_threads ();
1415 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
1417 the_target
->mourn (process
);
1419 /* Since we presently can only stop all lwps of all processes, we
1420 need to unstop lwps of other processes. */
1421 unstop_all_lwps (0, NULL
);
1425 /* Remove all LWPs that belong to process PROC from the lwp list. */
1428 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1430 struct thread_info
*thread
= (struct thread_info
*) entry
;
1431 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1432 struct process_info
*process
= (struct process_info
*) proc
;
1434 if (pid_of (thread
) == pid_of (process
))
1441 linux_mourn (struct process_info
*process
)
1443 struct process_info_private
*priv
;
1445 #ifdef USE_THREAD_DB
1446 thread_db_mourn (process
);
1449 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1451 /* Freeing all private data. */
1452 priv
= process
->priv
;
1453 free (priv
->arch_private
);
1455 process
->priv
= NULL
;
1457 remove_process (process
);
1461 linux_join (int pid
)
1466 ret
= my_waitpid (pid
, &status
, 0);
1467 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1469 } while (ret
!= -1 || errno
!= ECHILD
);
1472 /* Return nonzero if the given thread is still alive. */
1474 linux_thread_alive (ptid_t ptid
)
1476 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1478 /* We assume we always know if a thread exits. If a whole process
1479 exited but we still haven't been able to report it to GDB, we'll
1480 hold on to the last lwp of the dead process. */
1482 return !lwp_is_marked_dead (lwp
);
1487 /* Return 1 if this lwp still has an interesting status pending. If
1488 not (e.g., it had stopped for a breakpoint that is gone), return
1492 thread_still_has_status_pending_p (struct thread_info
*thread
)
1494 struct lwp_info
*lp
= get_thread_lwp (thread
);
1496 if (!lp
->status_pending_p
)
1499 /* If we got a `vCont;t', but we haven't reported a stop yet, do
1500 report any status pending the LWP may have. */
1501 if (thread
->last_resume_kind
== resume_stop
1502 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
1505 if (thread
->last_resume_kind
!= resume_stop
1506 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1507 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1509 struct thread_info
*saved_thread
;
1513 gdb_assert (lp
->last_status
!= 0);
1517 saved_thread
= current_thread
;
1518 current_thread
= thread
;
1520 if (pc
!= lp
->stop_pc
)
1523 debug_printf ("PC of %ld changed\n",
1528 #if !USE_SIGTRAP_SIGINFO
1529 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1530 && !(*the_low_target
.breakpoint_at
) (pc
))
1533 debug_printf ("previous SW breakpoint of %ld gone\n",
1537 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1538 && !hardware_breakpoint_inserted_here (pc
))
1541 debug_printf ("previous HW breakpoint of %ld gone\n",
1547 current_thread
= saved_thread
;
1552 debug_printf ("discarding pending breakpoint status\n");
1553 lp
->status_pending_p
= 0;
1561 /* Return 1 if this lwp has an interesting status pending. */
1563 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1565 struct thread_info
*thread
= (struct thread_info
*) entry
;
1566 struct lwp_info
*lp
= get_thread_lwp (thread
);
1567 ptid_t ptid
= * (ptid_t
*) arg
;
1569 /* Check if we're only interested in events from a specific process
1570 or a specific LWP. */
1571 if (!ptid_match (ptid_of (thread
), ptid
))
1574 if (lp
->status_pending_p
1575 && !thread_still_has_status_pending_p (thread
))
1577 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1581 return lp
->status_pending_p
;
1585 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1587 ptid_t ptid
= *(ptid_t
*) data
;
1590 if (ptid_get_lwp (ptid
) != 0)
1591 lwp
= ptid_get_lwp (ptid
);
1593 lwp
= ptid_get_pid (ptid
);
1595 if (ptid_get_lwp (entry
->id
) == lwp
)
1602 find_lwp_pid (ptid_t ptid
)
1604 struct inferior_list_entry
*thread
1605 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1610 return get_thread_lwp ((struct thread_info
*) thread
);
1613 /* Return the number of known LWPs in the tgid given by PID. */
1618 struct inferior_list_entry
*inf
, *tmp
;
1621 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1623 if (ptid_get_pid (inf
->id
) == pid
)
1630 /* The arguments passed to iterate_over_lwps. */
1632 struct iterate_over_lwps_args
1634 /* The FILTER argument passed to iterate_over_lwps. */
1637 /* The CALLBACK argument passed to iterate_over_lwps. */
1638 iterate_over_lwps_ftype
*callback
;
1640 /* The DATA argument passed to iterate_over_lwps. */
1644 /* Callback for find_inferior used by iterate_over_lwps to filter
1645 calls to the callback supplied to that function. Returning a
1646 nonzero value causes find_inferiors to stop iterating and return
1647 the current inferior_list_entry. Returning zero indicates that
1648 find_inferiors should continue iterating. */
1651 iterate_over_lwps_filter (struct inferior_list_entry
*entry
, void *args_p
)
1653 struct iterate_over_lwps_args
*args
1654 = (struct iterate_over_lwps_args
*) args_p
;
1656 if (ptid_match (entry
->id
, args
->filter
))
1658 struct thread_info
*thr
= (struct thread_info
*) entry
;
1659 struct lwp_info
*lwp
= get_thread_lwp (thr
);
1661 return (*args
->callback
) (lwp
, args
->data
);
1667 /* See nat/linux-nat.h. */
1670 iterate_over_lwps (ptid_t filter
,
1671 iterate_over_lwps_ftype callback
,
1674 struct iterate_over_lwps_args args
= {filter
, callback
, data
};
1675 struct inferior_list_entry
*entry
;
1677 entry
= find_inferior (&all_threads
, iterate_over_lwps_filter
, &args
);
1681 return get_thread_lwp ((struct thread_info
*) entry
);
1684 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1685 their exits until all other threads in the group have exited. */
1688 check_zombie_leaders (void)
1690 struct process_info
*proc
, *tmp
;
1692 ALL_PROCESSES (proc
, tmp
)
1694 pid_t leader_pid
= pid_of (proc
);
1695 struct lwp_info
*leader_lp
;
1697 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1700 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1701 "num_lwps=%d, zombie=%d\n",
1702 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1703 linux_proc_pid_is_zombie (leader_pid
));
1705 if (leader_lp
!= NULL
&& !leader_lp
->stopped
1706 /* Check if there are other threads in the group, as we may
1707 have raced with the inferior simply exiting. */
1708 && !last_thread_of_process_p (leader_pid
)
1709 && linux_proc_pid_is_zombie (leader_pid
))
1711 /* A leader zombie can mean one of two things:
1713 - It exited, and there's an exit status pending
1714 available, or only the leader exited (not the whole
1715 program). In the latter case, we can't waitpid the
1716 leader's exit status until all other threads are gone.
1718 - There are 3 or more threads in the group, and a thread
1719 other than the leader exec'd. On an exec, the Linux
1720 kernel destroys all other threads (except the execing
1721 one) in the thread group, and resets the execing thread's
1722 tid to the tgid. No exit notification is sent for the
1723 execing thread -- from the ptracer's perspective, it
1724 appears as though the execing thread just vanishes.
1725 Until we reap all other threads except the leader and the
1726 execing thread, the leader will be zombie, and the
1727 execing thread will be in `D (disc sleep)'. As soon as
1728 all other threads are reaped, the execing thread changes
1729 it's tid to the tgid, and the previous (zombie) leader
1730 vanishes, giving place to the "new" leader. We could try
1731 distinguishing the exit and exec cases, by waiting once
1732 more, and seeing if something comes out, but it doesn't
1733 sound useful. The previous leader _does_ go away, and
1734 we'll re-add the new one once we see the exec event
1735 (which is just the same as what would happen if the
1736 previous leader did exit voluntarily before some other
1741 "CZL: Thread group leader %d zombie "
1742 "(it exited, or another thread execd).\n",
1745 delete_lwp (leader_lp
);
1750 /* Callback for `find_inferior'. Returns the first LWP that is not
1751 stopped. ARG is a PTID filter. */
1754 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
1756 struct thread_info
*thr
= (struct thread_info
*) entry
;
1757 struct lwp_info
*lwp
;
1758 ptid_t filter
= *(ptid_t
*) arg
;
1760 if (!ptid_match (ptid_of (thr
), filter
))
1763 lwp
= get_thread_lwp (thr
);
1770 /* Increment LWP's suspend count. */
1773 lwp_suspended_inc (struct lwp_info
*lwp
)
1777 if (debug_threads
&& lwp
->suspended
> 4)
1779 struct thread_info
*thread
= get_lwp_thread (lwp
);
1781 debug_printf ("LWP %ld has a suspiciously high suspend count,"
1782 " suspended=%d\n", lwpid_of (thread
), lwp
->suspended
);
1786 /* Decrement LWP's suspend count. */
1789 lwp_suspended_decr (struct lwp_info
*lwp
)
1793 if (lwp
->suspended
< 0)
1795 struct thread_info
*thread
= get_lwp_thread (lwp
);
1797 internal_error (__FILE__
, __LINE__
,
1798 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread
),
1803 /* This function should only be called if the LWP got a SIGTRAP.
1805 Handle any tracepoint steps or hits. Return true if a tracepoint
1806 event was handled, 0 otherwise. */
1809 handle_tracepoints (struct lwp_info
*lwp
)
1811 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1812 int tpoint_related_event
= 0;
1814 gdb_assert (lwp
->suspended
== 0);
1816 /* If this tracepoint hit causes a tracing stop, we'll immediately
1817 uninsert tracepoints. To do this, we temporarily pause all
1818 threads, unpatch away, and then unpause threads. We need to make
1819 sure the unpausing doesn't resume LWP too. */
1820 lwp_suspended_inc (lwp
);
1822 /* And we need to be sure that any all-threads-stopping doesn't try
1823 to move threads out of the jump pads, as it could deadlock the
1824 inferior (LWP could be in the jump pad, maybe even holding the
1827 /* Do any necessary step collect actions. */
1828 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1830 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1832 /* See if we just hit a tracepoint and do its main collect
1834 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1836 lwp_suspended_decr (lwp
);
1838 gdb_assert (lwp
->suspended
== 0);
1839 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
1841 if (tpoint_related_event
)
1844 debug_printf ("got a tracepoint event\n");
1851 /* Convenience wrapper. Returns true if LWP is presently collecting a
1855 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
1856 struct fast_tpoint_collect_status
*status
)
1858 CORE_ADDR thread_area
;
1859 struct thread_info
*thread
= get_lwp_thread (lwp
);
1861 if (the_low_target
.get_thread_area
== NULL
)
1864 /* Get the thread area address. This is used to recognize which
1865 thread is which when tracing with the in-process agent library.
1866 We don't read anything from the address, and treat it as opaque;
1867 it's the address itself that we assume is unique per-thread. */
1868 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
1871 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1874 /* The reason we resume in the caller, is because we want to be able
1875 to pass lwp->status_pending as WSTAT, and we need to clear
1876 status_pending_p before resuming, otherwise, linux_resume_one_lwp
1877 refuses to resume. */
1880 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
1882 struct thread_info
*saved_thread
;
1884 saved_thread
= current_thread
;
1885 current_thread
= get_lwp_thread (lwp
);
1888 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
1889 && supports_fast_tracepoints ()
1890 && agent_loaded_p ())
1892 struct fast_tpoint_collect_status status
;
1896 debug_printf ("Checking whether LWP %ld needs to move out of the "
1898 lwpid_of (current_thread
));
1900 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
1903 || (WSTOPSIG (*wstat
) != SIGILL
1904 && WSTOPSIG (*wstat
) != SIGFPE
1905 && WSTOPSIG (*wstat
) != SIGSEGV
1906 && WSTOPSIG (*wstat
) != SIGBUS
))
1908 lwp
->collecting_fast_tracepoint
= r
;
1912 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
1914 /* Haven't executed the original instruction yet.
1915 Set breakpoint there, and wait till it's hit,
1916 then single-step until exiting the jump pad. */
1917 lwp
->exit_jump_pad_bkpt
1918 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
1922 debug_printf ("Checking whether LWP %ld needs to move out of "
1923 "the jump pad...it does\n",
1924 lwpid_of (current_thread
));
1925 current_thread
= saved_thread
;
1932 /* If we get a synchronous signal while collecting, *and*
1933 while executing the (relocated) original instruction,
1934 reset the PC to point at the tpoint address, before
1935 reporting to GDB. Otherwise, it's an IPA lib bug: just
1936 report the signal to GDB, and pray for the best. */
1938 lwp
->collecting_fast_tracepoint
= 0;
1941 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
1942 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
1945 struct regcache
*regcache
;
1947 /* The si_addr on a few signals references the address
1948 of the faulting instruction. Adjust that as
1950 if ((WSTOPSIG (*wstat
) == SIGILL
1951 || WSTOPSIG (*wstat
) == SIGFPE
1952 || WSTOPSIG (*wstat
) == SIGBUS
1953 || WSTOPSIG (*wstat
) == SIGSEGV
)
1954 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
1955 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
1956 /* Final check just to make sure we don't clobber
1957 the siginfo of non-kernel-sent signals. */
1958 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
1960 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
1961 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
1962 (PTRACE_TYPE_ARG3
) 0, &info
);
1965 regcache
= get_thread_regcache (current_thread
, 1);
1966 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
1967 lwp
->stop_pc
= status
.tpoint_addr
;
1969 /* Cancel any fast tracepoint lock this thread was
1971 force_unlock_trace_buffer ();
1974 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
1977 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
1978 "stopping all threads momentarily.\n");
1980 stop_all_lwps (1, lwp
);
1982 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
1983 lwp
->exit_jump_pad_bkpt
= NULL
;
1985 unstop_all_lwps (1, lwp
);
1987 gdb_assert (lwp
->suspended
>= 0);
1993 debug_printf ("Checking whether LWP %ld needs to move out of the "
1995 lwpid_of (current_thread
));
1997 current_thread
= saved_thread
;
2001 /* Enqueue one signal in the "signals to report later when out of the
2005 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2007 struct pending_signals
*p_sig
;
2008 struct thread_info
*thread
= get_lwp_thread (lwp
);
2011 debug_printf ("Deferring signal %d for LWP %ld.\n",
2012 WSTOPSIG (*wstat
), lwpid_of (thread
));
2016 struct pending_signals
*sig
;
2018 for (sig
= lwp
->pending_signals_to_report
;
2021 debug_printf (" Already queued %d\n",
2024 debug_printf (" (no more currently queued signals)\n");
2027 /* Don't enqueue non-RT signals if they are already in the deferred
2028 queue. (SIGSTOP being the easiest signal to see ending up here
2030 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
2032 struct pending_signals
*sig
;
2034 for (sig
= lwp
->pending_signals_to_report
;
2038 if (sig
->signal
== WSTOPSIG (*wstat
))
2041 debug_printf ("Not requeuing already queued non-RT signal %d"
2050 p_sig
= XCNEW (struct pending_signals
);
2051 p_sig
->prev
= lwp
->pending_signals_to_report
;
2052 p_sig
->signal
= WSTOPSIG (*wstat
);
2054 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2057 lwp
->pending_signals_to_report
= p_sig
;
2060 /* Dequeue one signal from the "signals to report later when out of
2061 the jump pad" list. */
2064 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
2066 struct thread_info
*thread
= get_lwp_thread (lwp
);
2068 if (lwp
->pending_signals_to_report
!= NULL
)
2070 struct pending_signals
**p_sig
;
2072 p_sig
= &lwp
->pending_signals_to_report
;
2073 while ((*p_sig
)->prev
!= NULL
)
2074 p_sig
= &(*p_sig
)->prev
;
2076 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
2077 if ((*p_sig
)->info
.si_signo
!= 0)
2078 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
2084 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2085 WSTOPSIG (*wstat
), lwpid_of (thread
));
2089 struct pending_signals
*sig
;
2091 for (sig
= lwp
->pending_signals_to_report
;
2094 debug_printf (" Still queued %d\n",
2097 debug_printf (" (no more queued signals)\n");
2106 /* Fetch the possibly triggered data watchpoint info and store it in
2109 On some archs, like x86, that use debug registers to set
2110 watchpoints, it's possible that the way to know which watched
2111 address trapped, is to check the register that is used to select
2112 which address to watch. Problem is, between setting the watchpoint
2113 and reading back which data address trapped, the user may change
2114 the set of watchpoints, and, as a consequence, GDB changes the
2115 debug registers in the inferior. To avoid reading back a stale
2116 stopped-data-address when that happens, we cache in LP the fact
2117 that a watchpoint trapped, and the corresponding data address, as
2118 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2119 registers meanwhile, we have the cached data we can rely on. */
2122 check_stopped_by_watchpoint (struct lwp_info
*child
)
2124 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2126 struct thread_info
*saved_thread
;
2128 saved_thread
= current_thread
;
2129 current_thread
= get_lwp_thread (child
);
2131 if (the_low_target
.stopped_by_watchpoint ())
2133 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2135 if (the_low_target
.stopped_data_address
!= NULL
)
2136 child
->stopped_data_address
2137 = the_low_target
.stopped_data_address ();
2139 child
->stopped_data_address
= 0;
2142 current_thread
= saved_thread
;
2145 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2148 /* Return the ptrace options that we want to try to enable. */
2151 linux_low_ptrace_options (int attached
)
2156 options
|= PTRACE_O_EXITKILL
;
2158 if (report_fork_events
)
2159 options
|= PTRACE_O_TRACEFORK
;
2161 if (report_vfork_events
)
2162 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2164 if (report_exec_events
)
2165 options
|= PTRACE_O_TRACEEXEC
;
2170 /* Do low-level handling of the event, and check if we should go on
2171 and pass it to caller code. Return the affected lwp if we are, or
2174 static struct lwp_info
*
2175 linux_low_filter_event (int lwpid
, int wstat
)
2177 struct lwp_info
*child
;
2178 struct thread_info
*thread
;
2179 int have_stop_pc
= 0;
2181 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2183 /* Check for stop events reported by a process we didn't already
2184 know about - anything not already in our LWP list.
2186 If we're expecting to receive stopped processes after
2187 fork, vfork, and clone events, then we'll just add the
2188 new one to our list and go back to waiting for the event
2189 to be reported - the stopped process might be returned
2190 from waitpid before or after the event is.
2192 But note the case of a non-leader thread exec'ing after the
2193 leader having exited, and gone from our lists (because
2194 check_zombie_leaders deleted it). The non-leader thread
2195 changes its tid to the tgid. */
2197 if (WIFSTOPPED (wstat
) && child
== NULL
&& WSTOPSIG (wstat
) == SIGTRAP
2198 && linux_ptrace_get_extended_event (wstat
) == PTRACE_EVENT_EXEC
)
2202 /* A multi-thread exec after we had seen the leader exiting. */
2205 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2206 "after exec.\n", lwpid
);
2209 child_ptid
= ptid_build (lwpid
, lwpid
, 0);
2210 child
= add_lwp (child_ptid
);
2212 current_thread
= child
->thread
;
2215 /* If we didn't find a process, one of two things presumably happened:
2216 - A process we started and then detached from has exited. Ignore it.
2217 - A process we are controlling has forked and the new child's stop
2218 was reported to us by the kernel. Save its PID. */
2219 if (child
== NULL
&& WIFSTOPPED (wstat
))
2221 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2224 else if (child
== NULL
)
2227 thread
= get_lwp_thread (child
);
2231 child
->last_status
= wstat
;
2233 /* Check if the thread has exited. */
2234 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2237 debug_printf ("LLFE: %d exited.\n", lwpid
);
2238 if (num_lwps (pid_of (thread
)) > 1)
2241 /* If there is at least one more LWP, then the exit signal was
2242 not the end of the debugged application and should be
2249 /* This was the last lwp in the process. Since events are
2250 serialized to GDB core, and we can't report this one
2251 right now, but GDB core and the other target layers will
2252 want to be notified about the exit code/signal, leave the
2253 status pending for the next time we're able to report
2255 mark_lwp_dead (child
, wstat
);
2260 gdb_assert (WIFSTOPPED (wstat
));
2262 if (WIFSTOPPED (wstat
))
2264 struct process_info
*proc
;
2266 /* Architecture-specific setup after inferior is running. */
2267 proc
= find_process_pid (pid_of (thread
));
2268 if (proc
->tdesc
== NULL
)
2272 /* This needs to happen after we have attached to the
2273 inferior and it is stopped for the first time, but
2274 before we access any inferior registers. */
2275 linux_arch_setup_thread (thread
);
2279 /* The process is started, but GDBserver will do
2280 architecture-specific setup after the program stops at
2281 the first instruction. */
2282 child
->status_pending_p
= 1;
2283 child
->status_pending
= wstat
;
2289 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2291 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2292 int options
= linux_low_ptrace_options (proc
->attached
);
2294 linux_enable_event_reporting (lwpid
, options
);
2295 child
->must_set_ptrace_flags
= 0;
2298 /* Be careful to not overwrite stop_pc until
2299 check_stopped_by_breakpoint is called. */
2300 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2301 && linux_is_extended_waitstatus (wstat
))
2303 child
->stop_pc
= get_pc (child
);
2304 if (handle_extended_wait (&child
, wstat
))
2306 /* The event has been handled, so just return without
2312 /* Check first whether this was a SW/HW breakpoint before checking
2313 watchpoints, because at least s390 can't tell the data address of
2314 hardware watchpoint hits, and returns stopped-by-watchpoint as
2315 long as there's a watchpoint set. */
2316 if (WIFSTOPPED (wstat
) && linux_wstatus_maybe_breakpoint (wstat
))
2318 if (check_stopped_by_breakpoint (child
))
2322 /* Note that TRAP_HWBKPT can indicate either a hardware breakpoint
2323 or hardware watchpoint. Check which is which if we got
2324 TARGET_STOPPED_BY_HW_BREAKPOINT. Likewise, we may have single
2325 stepped an instruction that triggered a watchpoint. In that
2326 case, on some architectures (such as x86), instead of
2327 TRAP_HWBKPT, si_code indicates TRAP_TRACE, and we need to check
2328 the debug registers separately. */
2329 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2330 && child
->stop_reason
!= TARGET_STOPPED_BY_SW_BREAKPOINT
)
2331 check_stopped_by_watchpoint (child
);
2334 child
->stop_pc
= get_pc (child
);
2336 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2337 && child
->stop_expected
)
2340 debug_printf ("Expected stop.\n");
2341 child
->stop_expected
= 0;
2343 if (thread
->last_resume_kind
== resume_stop
)
2345 /* We want to report the stop to the core. Treat the
2346 SIGSTOP as a normal event. */
2348 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2349 target_pid_to_str (ptid_of (thread
)));
2351 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2353 /* Stopping threads. We don't want this SIGSTOP to end up
2356 debug_printf ("LLW: SIGSTOP caught for %s "
2357 "while stopping threads.\n",
2358 target_pid_to_str (ptid_of (thread
)));
2363 /* This is a delayed SIGSTOP. Filter out the event. */
2365 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2366 child
->stepping
? "step" : "continue",
2367 target_pid_to_str (ptid_of (thread
)));
2369 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2374 child
->status_pending_p
= 1;
2375 child
->status_pending
= wstat
;
2379 /* Resume LWPs that are currently stopped without any pending status
2380 to report, but are resumed from the core's perspective. */
2383 resume_stopped_resumed_lwps (struct inferior_list_entry
*entry
)
2385 struct thread_info
*thread
= (struct thread_info
*) entry
;
2386 struct lwp_info
*lp
= get_thread_lwp (thread
);
2390 && !lp
->status_pending_p
2391 && thread
->last_resume_kind
!= resume_stop
2392 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2394 int step
= thread
->last_resume_kind
== resume_step
;
2397 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2398 target_pid_to_str (ptid_of (thread
)),
2399 paddress (lp
->stop_pc
),
2402 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2406 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2407 match FILTER_PTID (leaving others pending). The PTIDs can be:
2408 minus_one_ptid, to specify any child; a pid PTID, specifying all
2409 lwps of a thread group; or a PTID representing a single lwp. Store
2410 the stop status through the status pointer WSTAT. OPTIONS is
2411 passed to the waitpid call. Return 0 if no event was found and
2412 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2413 was found. Return the PID of the stopped child otherwise. */
2416 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2417 int *wstatp
, int options
)
2419 struct thread_info
*event_thread
;
2420 struct lwp_info
*event_child
, *requested_child
;
2421 sigset_t block_mask
, prev_mask
;
2424 /* N.B. event_thread points to the thread_info struct that contains
2425 event_child. Keep them in sync. */
2426 event_thread
= NULL
;
2428 requested_child
= NULL
;
2430 /* Check for a lwp with a pending status. */
2432 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2434 event_thread
= (struct thread_info
*)
2435 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2436 if (event_thread
!= NULL
)
2437 event_child
= get_thread_lwp (event_thread
);
2438 if (debug_threads
&& event_thread
)
2439 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2441 else if (!ptid_equal (filter_ptid
, null_ptid
))
2443 requested_child
= find_lwp_pid (filter_ptid
);
2445 if (stopping_threads
== NOT_STOPPING_THREADS
2446 && requested_child
->status_pending_p
2447 && requested_child
->collecting_fast_tracepoint
)
2449 enqueue_one_deferred_signal (requested_child
,
2450 &requested_child
->status_pending
);
2451 requested_child
->status_pending_p
= 0;
2452 requested_child
->status_pending
= 0;
2453 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2456 if (requested_child
->suspended
2457 && requested_child
->status_pending_p
)
2459 internal_error (__FILE__
, __LINE__
,
2460 "requesting an event out of a"
2461 " suspended child?");
2464 if (requested_child
->status_pending_p
)
2466 event_child
= requested_child
;
2467 event_thread
= get_lwp_thread (event_child
);
2471 if (event_child
!= NULL
)
2474 debug_printf ("Got an event from pending child %ld (%04x)\n",
2475 lwpid_of (event_thread
), event_child
->status_pending
);
2476 *wstatp
= event_child
->status_pending
;
2477 event_child
->status_pending_p
= 0;
2478 event_child
->status_pending
= 0;
2479 current_thread
= event_thread
;
2480 return lwpid_of (event_thread
);
2483 /* But if we don't find a pending event, we'll have to wait.
2485 We only enter this loop if no process has a pending wait status.
2486 Thus any action taken in response to a wait status inside this
2487 loop is responding as soon as we detect the status, not after any
2490 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2491 all signals while here. */
2492 sigfillset (&block_mask
);
2493 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2495 /* Always pull all events out of the kernel. We'll randomly select
2496 an event LWP out of all that have events, to prevent
2498 while (event_child
== NULL
)
2502 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2505 - If the thread group leader exits while other threads in the
2506 thread group still exist, waitpid(TGID, ...) hangs. That
2507 waitpid won't return an exit status until the other threads
2508 in the group are reaped.
2510 - When a non-leader thread execs, that thread just vanishes
2511 without reporting an exit (so we'd hang if we waited for it
2512 explicitly in that case). The exec event is reported to
2515 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2518 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2519 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2525 debug_printf ("LLW: waitpid %ld received %s\n",
2526 (long) ret
, status_to_str (*wstatp
));
2529 /* Filter all events. IOW, leave all events pending. We'll
2530 randomly select an event LWP out of all that have events
2532 linux_low_filter_event (ret
, *wstatp
);
2533 /* Retry until nothing comes out of waitpid. A single
2534 SIGCHLD can indicate more than one child stopped. */
2538 /* Now that we've pulled all events out of the kernel, resume
2539 LWPs that don't have an interesting event to report. */
2540 if (stopping_threads
== NOT_STOPPING_THREADS
)
2541 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2543 /* ... and find an LWP with a status to report to the core, if
2545 event_thread
= (struct thread_info
*)
2546 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2547 if (event_thread
!= NULL
)
2549 event_child
= get_thread_lwp (event_thread
);
2550 *wstatp
= event_child
->status_pending
;
2551 event_child
->status_pending_p
= 0;
2552 event_child
->status_pending
= 0;
2556 /* Check for zombie thread group leaders. Those can't be reaped
2557 until all other threads in the thread group are. */
2558 check_zombie_leaders ();
2560 /* If there are no resumed children left in the set of LWPs we
2561 want to wait for, bail. We can't just block in
2562 waitpid/sigsuspend, because lwps might have been left stopped
2563 in trace-stop state, and we'd be stuck forever waiting for
2564 their status to change (which would only happen if we resumed
2565 them). Even if WNOHANG is set, this return code is preferred
2566 over 0 (below), as it is more detailed. */
2567 if ((find_inferior (&all_threads
,
2568 not_stopped_callback
,
2569 &wait_ptid
) == NULL
))
2572 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2573 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2577 /* No interesting event to report to the caller. */
2578 if ((options
& WNOHANG
))
2581 debug_printf ("WNOHANG set, no event found\n");
2583 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2587 /* Block until we get an event reported with SIGCHLD. */
2589 debug_printf ("sigsuspend'ing\n");
2591 sigsuspend (&prev_mask
);
2592 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2596 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2598 current_thread
= event_thread
;
2600 /* Check for thread exit. */
2601 if (! WIFSTOPPED (*wstatp
))
2603 gdb_assert (last_thread_of_process_p (pid_of (event_thread
)));
2606 debug_printf ("LWP %d is the last lwp of process. "
2607 "Process %ld exiting.\n",
2608 pid_of (event_thread
), lwpid_of (event_thread
));
2609 return lwpid_of (event_thread
);
2612 return lwpid_of (event_thread
);
2615 /* Wait for an event from child(ren) PTID. PTIDs can be:
2616 minus_one_ptid, to specify any child; a pid PTID, specifying all
2617 lwps of a thread group; or a PTID representing a single lwp. Store
2618 the stop status through the status pointer WSTAT. OPTIONS is
2619 passed to the waitpid call. Return 0 if no event was found and
2620 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2621 was found. Return the PID of the stopped child otherwise. */
2624 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2626 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2629 /* Count the LWP's that have had events. */
2632 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2634 struct thread_info
*thread
= (struct thread_info
*) entry
;
2635 struct lwp_info
*lp
= get_thread_lwp (thread
);
2636 int *count
= (int *) data
;
2638 gdb_assert (count
!= NULL
);
2640 /* Count only resumed LWPs that have an event pending. */
2641 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2642 && lp
->status_pending_p
)
2648 /* Select the LWP (if any) that is currently being single-stepped. */
2651 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2653 struct thread_info
*thread
= (struct thread_info
*) entry
;
2654 struct lwp_info
*lp
= get_thread_lwp (thread
);
2656 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2657 && thread
->last_resume_kind
== resume_step
2658 && lp
->status_pending_p
)
2664 /* Select the Nth LWP that has had an event. */
2667 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2669 struct thread_info
*thread
= (struct thread_info
*) entry
;
2670 struct lwp_info
*lp
= get_thread_lwp (thread
);
2671 int *selector
= (int *) data
;
2673 gdb_assert (selector
!= NULL
);
2675 /* Select only resumed LWPs that have an event pending. */
2676 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2677 && lp
->status_pending_p
)
2678 if ((*selector
)-- == 0)
2684 /* Select one LWP out of those that have events pending. */
2687 select_event_lwp (struct lwp_info
**orig_lp
)
2690 int random_selector
;
2691 struct thread_info
*event_thread
= NULL
;
2693 /* In all-stop, give preference to the LWP that is being
2694 single-stepped. There will be at most one, and it's the LWP that
2695 the core is most interested in. If we didn't do this, then we'd
2696 have to handle pending step SIGTRAPs somehow in case the core
2697 later continues the previously-stepped thread, otherwise we'd
2698 report the pending SIGTRAP, and the core, not having stepped the
2699 thread, wouldn't understand what the trap was for, and therefore
2700 would report it to the user as a random signal. */
2704 = (struct thread_info
*) find_inferior (&all_threads
,
2705 select_singlestep_lwp_callback
,
2707 if (event_thread
!= NULL
)
2710 debug_printf ("SEL: Select single-step %s\n",
2711 target_pid_to_str (ptid_of (event_thread
)));
2714 if (event_thread
== NULL
)
2716 /* No single-stepping LWP. Select one at random, out of those
2717 which have had events. */
2719 /* First see how many events we have. */
2720 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2721 gdb_assert (num_events
> 0);
2723 /* Now randomly pick a LWP out of those that have had
2725 random_selector
= (int)
2726 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2728 if (debug_threads
&& num_events
> 1)
2729 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2730 num_events
, random_selector
);
2733 = (struct thread_info
*) find_inferior (&all_threads
,
2734 select_event_lwp_callback
,
2738 if (event_thread
!= NULL
)
2740 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2742 /* Switch the event LWP. */
2743 *orig_lp
= event_lp
;
2747 /* Decrement the suspend count of an LWP. */
2750 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2752 struct thread_info
*thread
= (struct thread_info
*) entry
;
2753 struct lwp_info
*lwp
= get_thread_lwp (thread
);
2755 /* Ignore EXCEPT. */
2759 lwp_suspended_decr (lwp
);
2763 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2767 unsuspend_all_lwps (struct lwp_info
*except
)
2769 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
2772 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
2773 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
2775 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
2776 static ptid_t
linux_wait_1 (ptid_t ptid
,
2777 struct target_waitstatus
*ourstatus
,
2778 int target_options
);
2780 /* Stabilize threads (move out of jump pads).
2782 If a thread is midway collecting a fast tracepoint, we need to
2783 finish the collection and move it out of the jump pad before
2784 reporting the signal.
2786 This avoids recursion while collecting (when a signal arrives
2787 midway, and the signal handler itself collects), which would trash
2788 the trace buffer. In case the user set a breakpoint in a signal
2789 handler, this avoids the backtrace showing the jump pad, etc..
2790 Most importantly, there are certain things we can't do safely if
2791 threads are stopped in a jump pad (or in its callee's). For
2794 - starting a new trace run. A thread still collecting the
2795 previous run, could trash the trace buffer when resumed. The trace
2796 buffer control structures would have been reset but the thread had
2797 no way to tell. The thread could even midway memcpy'ing to the
2798 buffer, which would mean that when resumed, it would clobber the
2799 trace buffer that had been set for a new run.
2801 - we can't rewrite/reuse the jump pads for new tracepoints
2802 safely. Say you do tstart while a thread is stopped midway while
2803 collecting. When the thread is later resumed, it finishes the
2804 collection, and returns to the jump pad, to execute the original
2805 instruction that was under the tracepoint jump at the time the
2806 older run had been started. If the jump pad had been rewritten
2807 since for something else in the new run, the thread would now
2808 execute the wrong / random instructions. */
2811 linux_stabilize_threads (void)
2813 struct thread_info
*saved_thread
;
2814 struct thread_info
*thread_stuck
;
2817 = (struct thread_info
*) find_inferior (&all_threads
,
2818 stuck_in_jump_pad_callback
,
2820 if (thread_stuck
!= NULL
)
2823 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2824 lwpid_of (thread_stuck
));
2828 saved_thread
= current_thread
;
2830 stabilizing_threads
= 1;
2833 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
2835 /* Loop until all are stopped out of the jump pads. */
2836 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
2838 struct target_waitstatus ourstatus
;
2839 struct lwp_info
*lwp
;
2842 /* Note that we go through the full wait even loop. While
2843 moving threads out of jump pad, we need to be able to step
2844 over internal breakpoints and such. */
2845 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2847 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2849 lwp
= get_thread_lwp (current_thread
);
2852 lwp_suspended_inc (lwp
);
2854 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
2855 || current_thread
->last_resume_kind
== resume_stop
)
2857 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
2858 enqueue_one_deferred_signal (lwp
, &wstat
);
2863 find_inferior (&all_threads
, unsuspend_one_lwp
, NULL
);
2865 stabilizing_threads
= 0;
2867 current_thread
= saved_thread
;
2872 = (struct thread_info
*) find_inferior (&all_threads
,
2873 stuck_in_jump_pad_callback
,
2875 if (thread_stuck
!= NULL
)
2876 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
2877 lwpid_of (thread_stuck
));
2881 static void async_file_mark (void);
2883 /* Convenience function that is called when the kernel reports an
2884 event that is not passed out to GDB. */
2887 ignore_event (struct target_waitstatus
*ourstatus
)
2889 /* If we got an event, there may still be others, as a single
2890 SIGCHLD can indicate more than one child stopped. This forces
2891 another target_wait call. */
2894 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2898 /* Wait for process, returns status. */
2901 linux_wait_1 (ptid_t ptid
,
2902 struct target_waitstatus
*ourstatus
, int target_options
)
2905 struct lwp_info
*event_child
;
2908 int step_over_finished
;
2909 int bp_explains_trap
;
2910 int maybe_internal_trap
;
2918 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
2921 /* Translate generic target options into linux options. */
2923 if (target_options
& TARGET_WNOHANG
)
2926 bp_explains_trap
= 0;
2929 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2931 if (ptid_equal (step_over_bkpt
, null_ptid
))
2932 pid
= linux_wait_for_event (ptid
, &w
, options
);
2936 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
2937 target_pid_to_str (step_over_bkpt
));
2938 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
2943 gdb_assert (target_options
& TARGET_WNOHANG
);
2947 debug_printf ("linux_wait_1 ret = null_ptid, "
2948 "TARGET_WAITKIND_IGNORE\n");
2952 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2959 debug_printf ("linux_wait_1 ret = null_ptid, "
2960 "TARGET_WAITKIND_NO_RESUMED\n");
2964 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
2968 event_child
= get_thread_lwp (current_thread
);
2970 /* linux_wait_for_event only returns an exit status for the last
2971 child of a process. Report it. */
2972 if (WIFEXITED (w
) || WIFSIGNALED (w
))
2976 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
2977 ourstatus
->value
.integer
= WEXITSTATUS (w
);
2981 debug_printf ("linux_wait_1 ret = %s, exited with "
2983 target_pid_to_str (ptid_of (current_thread
)),
2990 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
2991 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
2995 debug_printf ("linux_wait_1 ret = %s, terminated with "
2997 target_pid_to_str (ptid_of (current_thread
)),
3003 return ptid_of (current_thread
);
3006 /* If step-over executes a breakpoint instruction, it means a
3007 gdb/gdbserver breakpoint had been planted on top of a permanent
3008 breakpoint. The PC has been adjusted by
3009 check_stopped_by_breakpoint to point at the breakpoint address.
3010 Advance the PC manually past the breakpoint, otherwise the
3011 program would keep trapping the permanent breakpoint forever. */
3012 if (!ptid_equal (step_over_bkpt
, null_ptid
)
3013 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
3015 int increment_pc
= 0;
3016 int breakpoint_kind
= 0;
3017 CORE_ADDR stop_pc
= event_child
->stop_pc
;
3019 breakpoint_kind
= the_target
->breakpoint_kind_from_pc (&stop_pc
);
3020 the_target
->sw_breakpoint_from_kind (breakpoint_kind
, &increment_pc
);
3024 debug_printf ("step-over for %s executed software breakpoint\n",
3025 target_pid_to_str (ptid_of (current_thread
)));
3028 if (increment_pc
!= 0)
3030 struct regcache
*regcache
3031 = get_thread_regcache (current_thread
, 1);
3033 event_child
->stop_pc
+= increment_pc
;
3034 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3036 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
3037 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3041 /* If this event was not handled before, and is not a SIGTRAP, we
3042 report it. SIGILL and SIGSEGV are also treated as traps in case
3043 a breakpoint is inserted at the current PC. If this target does
3044 not support internal breakpoints at all, we also report the
3045 SIGTRAP without further processing; it's of no concern to us. */
3047 = (supports_breakpoints ()
3048 && (WSTOPSIG (w
) == SIGTRAP
3049 || ((WSTOPSIG (w
) == SIGILL
3050 || WSTOPSIG (w
) == SIGSEGV
)
3051 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
3053 if (maybe_internal_trap
)
3055 /* Handle anything that requires bookkeeping before deciding to
3056 report the event or continue waiting. */
3058 /* First check if we can explain the SIGTRAP with an internal
3059 breakpoint, or if we should possibly report the event to GDB.
3060 Do this before anything that may remove or insert a
3062 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
3064 /* We have a SIGTRAP, possibly a step-over dance has just
3065 finished. If so, tweak the state machine accordingly,
3066 reinsert breakpoints and delete any reinsert (software
3067 single-step) breakpoints. */
3068 step_over_finished
= finish_step_over (event_child
);
3070 /* Now invoke the callbacks of any internal breakpoints there. */
3071 check_breakpoints (event_child
->stop_pc
);
3073 /* Handle tracepoint data collecting. This may overflow the
3074 trace buffer, and cause a tracing stop, removing
3076 trace_event
= handle_tracepoints (event_child
);
3078 if (bp_explains_trap
)
3080 /* If we stepped or ran into an internal breakpoint, we've
3081 already handled it. So next time we resume (from this
3082 PC), we should step over it. */
3084 debug_printf ("Hit a gdbserver breakpoint.\n");
3086 if (breakpoint_here (event_child
->stop_pc
))
3087 event_child
->need_step_over
= 1;
3092 /* We have some other signal, possibly a step-over dance was in
3093 progress, and it should be cancelled too. */
3094 step_over_finished
= finish_step_over (event_child
);
3097 /* We have all the data we need. Either report the event to GDB, or
3098 resume threads and keep waiting for more. */
3100 /* If we're collecting a fast tracepoint, finish the collection and
3101 move out of the jump pad before delivering a signal. See
3102 linux_stabilize_threads. */
3105 && WSTOPSIG (w
) != SIGTRAP
3106 && supports_fast_tracepoints ()
3107 && agent_loaded_p ())
3110 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3111 "to defer or adjust it.\n",
3112 WSTOPSIG (w
), lwpid_of (current_thread
));
3114 /* Allow debugging the jump pad itself. */
3115 if (current_thread
->last_resume_kind
!= resume_step
3116 && maybe_move_out_of_jump_pad (event_child
, &w
))
3118 enqueue_one_deferred_signal (event_child
, &w
);
3121 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3122 WSTOPSIG (w
), lwpid_of (current_thread
));
3124 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
3126 return ignore_event (ourstatus
);
3130 if (event_child
->collecting_fast_tracepoint
)
3133 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3134 "Check if we're already there.\n",
3135 lwpid_of (current_thread
),
3136 event_child
->collecting_fast_tracepoint
);
3140 event_child
->collecting_fast_tracepoint
3141 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3143 if (event_child
->collecting_fast_tracepoint
!= 1)
3145 /* No longer need this breakpoint. */
3146 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3149 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3150 "stopping all threads momentarily.\n");
3152 /* Other running threads could hit this breakpoint.
3153 We don't handle moribund locations like GDB does,
3154 instead we always pause all threads when removing
3155 breakpoints, so that any step-over or
3156 decr_pc_after_break adjustment is always taken
3157 care of while the breakpoint is still
3159 stop_all_lwps (1, event_child
);
3161 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3162 event_child
->exit_jump_pad_bkpt
= NULL
;
3164 unstop_all_lwps (1, event_child
);
3166 gdb_assert (event_child
->suspended
>= 0);
3170 if (event_child
->collecting_fast_tracepoint
== 0)
3173 debug_printf ("fast tracepoint finished "
3174 "collecting successfully.\n");
3176 /* We may have a deferred signal to report. */
3177 if (dequeue_one_deferred_signal (event_child
, &w
))
3180 debug_printf ("dequeued one signal.\n");
3185 debug_printf ("no deferred signals.\n");
3187 if (stabilizing_threads
)
3189 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3190 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3194 debug_printf ("linux_wait_1 ret = %s, stopped "
3195 "while stabilizing threads\n",
3196 target_pid_to_str (ptid_of (current_thread
)));
3200 return ptid_of (current_thread
);
3206 /* Check whether GDB would be interested in this event. */
3208 /* If GDB is not interested in this signal, don't stop other
3209 threads, and don't report it to GDB. Just resume the inferior
3210 right away. We do this for threading-related signals as well as
3211 any that GDB specifically requested we ignore. But never ignore
3212 SIGSTOP if we sent it ourselves, and do not ignore signals when
3213 stepping - they may require special handling to skip the signal
3214 handler. Also never ignore signals that could be caused by a
3216 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
3219 && current_thread
->last_resume_kind
!= resume_step
3221 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3222 (current_process ()->priv
->thread_db
!= NULL
3223 && (WSTOPSIG (w
) == __SIGRTMIN
3224 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3227 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3228 && !(WSTOPSIG (w
) == SIGSTOP
3229 && current_thread
->last_resume_kind
== resume_stop
)
3230 && !linux_wstatus_maybe_breakpoint (w
))))
3232 siginfo_t info
, *info_p
;
3235 debug_printf ("Ignored signal %d for LWP %ld.\n",
3236 WSTOPSIG (w
), lwpid_of (current_thread
));
3238 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3239 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3244 if (step_over_finished
)
3246 /* We cancelled this thread's step-over above. We still
3247 need to unsuspend all other LWPs, and set them back
3248 running again while the signal handler runs. */
3249 unsuspend_all_lwps (event_child
);
3251 /* Enqueue the pending signal info so that proceed_all_lwps
3253 enqueue_pending_signal (event_child
, WSTOPSIG (w
), info_p
);
3255 proceed_all_lwps ();
3259 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3260 WSTOPSIG (w
), info_p
);
3262 return ignore_event (ourstatus
);
3265 /* Note that all addresses are always "out of the step range" when
3266 there's no range to begin with. */
3267 in_step_range
= lwp_in_step_range (event_child
);
3269 /* If GDB wanted this thread to single step, and the thread is out
3270 of the step range, we always want to report the SIGTRAP, and let
3271 GDB handle it. Watchpoints should always be reported. So should
3272 signals we can't explain. A SIGTRAP we can't explain could be a
3273 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3274 do, we're be able to handle GDB breakpoints on top of internal
3275 breakpoints, by handling the internal breakpoint and still
3276 reporting the event to GDB. If we don't, we're out of luck, GDB
3277 won't see the breakpoint hit. If we see a single-step event but
3278 the thread should be continuing, don't pass the trap to gdb.
3279 That indicates that we had previously finished a single-step but
3280 left the single-step pending -- see
3281 complete_ongoing_step_over. */
3282 report_to_gdb
= (!maybe_internal_trap
3283 || (current_thread
->last_resume_kind
== resume_step
3285 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3287 && !bp_explains_trap
3289 && !step_over_finished
3290 && !(current_thread
->last_resume_kind
== resume_continue
3291 && event_child
->stop_reason
== TARGET_STOPPED_BY_SINGLE_STEP
))
3292 || (gdb_breakpoint_here (event_child
->stop_pc
)
3293 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3294 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3295 || event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
);
3297 run_breakpoint_commands (event_child
->stop_pc
);
3299 /* We found no reason GDB would want us to stop. We either hit one
3300 of our own breakpoints, or finished an internal step GDB
3301 shouldn't know about. */
3306 if (bp_explains_trap
)
3307 debug_printf ("Hit a gdbserver breakpoint.\n");
3308 if (step_over_finished
)
3309 debug_printf ("Step-over finished.\n");
3311 debug_printf ("Tracepoint event.\n");
3312 if (lwp_in_step_range (event_child
))
3313 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3314 paddress (event_child
->stop_pc
),
3315 paddress (event_child
->step_range_start
),
3316 paddress (event_child
->step_range_end
));
3319 /* We're not reporting this breakpoint to GDB, so apply the
3320 decr_pc_after_break adjustment to the inferior's regcache
3323 if (the_low_target
.set_pc
!= NULL
)
3325 struct regcache
*regcache
3326 = get_thread_regcache (current_thread
, 1);
3327 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3330 /* We may have finished stepping over a breakpoint. If so,
3331 we've stopped and suspended all LWPs momentarily except the
3332 stepping one. This is where we resume them all again. We're
3333 going to keep waiting, so use proceed, which handles stepping
3334 over the next breakpoint. */
3336 debug_printf ("proceeding all threads.\n");
3338 if (step_over_finished
)
3339 unsuspend_all_lwps (event_child
);
3341 proceed_all_lwps ();
3342 return ignore_event (ourstatus
);
3347 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3351 str
= target_waitstatus_to_string (&event_child
->waitstatus
);
3352 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3353 lwpid_of (get_lwp_thread (event_child
)), str
);
3356 if (current_thread
->last_resume_kind
== resume_step
)
3358 if (event_child
->step_range_start
== event_child
->step_range_end
)
3359 debug_printf ("GDB wanted to single-step, reporting event.\n");
3360 else if (!lwp_in_step_range (event_child
))
3361 debug_printf ("Out of step range, reporting event.\n");
3363 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3364 debug_printf ("Stopped by watchpoint.\n");
3365 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3366 debug_printf ("Stopped by GDB breakpoint.\n");
3368 debug_printf ("Hit a non-gdbserver trap event.\n");
3371 /* Alright, we're going to report a stop. */
3373 if (!stabilizing_threads
)
3375 /* In all-stop, stop all threads. */
3377 stop_all_lwps (0, NULL
);
3379 /* If we're not waiting for a specific LWP, choose an event LWP
3380 from among those that have had events. Giving equal priority
3381 to all LWPs that have had events helps prevent
3383 if (ptid_equal (ptid
, minus_one_ptid
))
3385 event_child
->status_pending_p
= 1;
3386 event_child
->status_pending
= w
;
3388 select_event_lwp (&event_child
);
3390 /* current_thread and event_child must stay in sync. */
3391 current_thread
= get_lwp_thread (event_child
);
3393 event_child
->status_pending_p
= 0;
3394 w
= event_child
->status_pending
;
3397 if (step_over_finished
)
3401 /* If we were doing a step-over, all other threads but
3402 the stepping one had been paused in start_step_over,
3403 with their suspend counts incremented. We don't want
3404 to do a full unstop/unpause, because we're in
3405 all-stop mode (so we want threads stopped), but we
3406 still need to unsuspend the other threads, to
3407 decrement their `suspended' count back. */
3408 unsuspend_all_lwps (event_child
);
3412 /* If we just finished a step-over, then all threads had
3413 been momentarily paused. In all-stop, that's fine,
3414 we want threads stopped by now anyway. In non-stop,
3415 we need to re-resume threads that GDB wanted to be
3417 unstop_all_lwps (1, event_child
);
3421 /* Stabilize threads (move out of jump pads). */
3423 stabilize_threads ();
3427 /* If we just finished a step-over, then all threads had been
3428 momentarily paused. In all-stop, that's fine, we want
3429 threads stopped by now anyway. In non-stop, we need to
3430 re-resume threads that GDB wanted to be running. */
3431 if (step_over_finished
)
3432 unstop_all_lwps (1, event_child
);
3435 if (event_child
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3437 /* If the reported event is an exit, fork, vfork or exec, let
3439 *ourstatus
= event_child
->waitstatus
;
3440 /* Clear the event lwp's waitstatus since we handled it already. */
3441 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3444 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3446 /* Now that we've selected our final event LWP, un-adjust its PC if
3447 it was a software breakpoint, and the client doesn't know we can
3448 adjust the breakpoint ourselves. */
3449 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3450 && !swbreak_feature
)
3452 int decr_pc
= the_low_target
.decr_pc_after_break
;
3456 struct regcache
*regcache
3457 = get_thread_regcache (current_thread
, 1);
3458 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3462 if (current_thread
->last_resume_kind
== resume_stop
3463 && WSTOPSIG (w
) == SIGSTOP
)
3465 /* A thread that has been requested to stop by GDB with vCont;t,
3466 and it stopped cleanly, so report as SIG0. The use of
3467 SIGSTOP is an implementation detail. */
3468 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3470 else if (current_thread
->last_resume_kind
== resume_stop
3471 && WSTOPSIG (w
) != SIGSTOP
)
3473 /* A thread that has been requested to stop by GDB with vCont;t,
3474 but, it stopped for other reasons. */
3475 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3477 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3479 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3482 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3486 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3487 target_pid_to_str (ptid_of (current_thread
)),
3488 ourstatus
->kind
, ourstatus
->value
.sig
);
3492 return ptid_of (current_thread
);
3495 /* Get rid of any pending event in the pipe. */
3497 async_file_flush (void)
3503 ret
= read (linux_event_pipe
[0], &buf
, 1);
3504 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3507 /* Put something in the pipe, so the event loop wakes up. */
3509 async_file_mark (void)
3513 async_file_flush ();
3516 ret
= write (linux_event_pipe
[1], "+", 1);
3517 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3519 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3520 be awakened anyway. */
3524 linux_wait (ptid_t ptid
,
3525 struct target_waitstatus
*ourstatus
, int target_options
)
3529 /* Flush the async file first. */
3530 if (target_is_async_p ())
3531 async_file_flush ();
3535 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3537 while ((target_options
& TARGET_WNOHANG
) == 0
3538 && ptid_equal (event_ptid
, null_ptid
)
3539 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3541 /* If at least one stop was reported, there may be more. A single
3542 SIGCHLD can signal more than one child stop. */
3543 if (target_is_async_p ()
3544 && (target_options
& TARGET_WNOHANG
) != 0
3545 && !ptid_equal (event_ptid
, null_ptid
))
3551 /* Send a signal to an LWP. */
3554 kill_lwp (unsigned long lwpid
, int signo
)
3556 /* Use tkill, if possible, in case we are using nptl threads. If tkill
3557 fails, then we are not using nptl threads and we should be using kill. */
3561 static int tkill_failed
;
3568 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3569 if (errno
!= ENOSYS
)
3576 return kill (lwpid
, signo
);
3580 linux_stop_lwp (struct lwp_info
*lwp
)
3586 send_sigstop (struct lwp_info
*lwp
)
3590 pid
= lwpid_of (get_lwp_thread (lwp
));
3592 /* If we already have a pending stop signal for this process, don't
3594 if (lwp
->stop_expected
)
3597 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3603 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3605 lwp
->stop_expected
= 1;
3606 kill_lwp (pid
, SIGSTOP
);
3610 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
3612 struct thread_info
*thread
= (struct thread_info
*) entry
;
3613 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3615 /* Ignore EXCEPT. */
3626 /* Increment the suspend count of an LWP, and stop it, if not stopped
3629 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
3632 struct thread_info
*thread
= (struct thread_info
*) entry
;
3633 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3635 /* Ignore EXCEPT. */
3639 lwp_suspended_inc (lwp
);
3641 return send_sigstop_callback (entry
, except
);
3645 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3647 /* Store the exit status for later. */
3648 lwp
->status_pending_p
= 1;
3649 lwp
->status_pending
= wstat
;
3651 /* Store in waitstatus as well, as there's nothing else to process
3653 if (WIFEXITED (wstat
))
3655 lwp
->waitstatus
.kind
= TARGET_WAITKIND_EXITED
;
3656 lwp
->waitstatus
.value
.integer
= WEXITSTATUS (wstat
);
3658 else if (WIFSIGNALED (wstat
))
3660 lwp
->waitstatus
.kind
= TARGET_WAITKIND_SIGNALLED
;
3661 lwp
->waitstatus
.value
.sig
= gdb_signal_from_host (WTERMSIG (wstat
));
3664 /* Prevent trying to stop it. */
3667 /* No further stops are expected from a dead lwp. */
3668 lwp
->stop_expected
= 0;
3671 /* Return true if LWP has exited already, and has a pending exit event
3672 to report to GDB. */
3675 lwp_is_marked_dead (struct lwp_info
*lwp
)
3677 return (lwp
->status_pending_p
3678 && (WIFEXITED (lwp
->status_pending
)
3679 || WIFSIGNALED (lwp
->status_pending
)));
3682 /* Wait for all children to stop for the SIGSTOPs we just queued. */
3685 wait_for_sigstop (void)
3687 struct thread_info
*saved_thread
;
3692 saved_thread
= current_thread
;
3693 if (saved_thread
!= NULL
)
3694 saved_tid
= saved_thread
->entry
.id
;
3696 saved_tid
= null_ptid
; /* avoid bogus unused warning */
3699 debug_printf ("wait_for_sigstop: pulling events\n");
3701 /* Passing NULL_PTID as filter indicates we want all events to be
3702 left pending. Eventually this returns when there are no
3703 unwaited-for children left. */
3704 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
3706 gdb_assert (ret
== -1);
3708 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
3709 current_thread
= saved_thread
;
3713 debug_printf ("Previously current thread died.\n");
3715 /* We can't change the current inferior behind GDB's back,
3716 otherwise, a subsequent command may apply to the wrong
3718 current_thread
= NULL
;
3722 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
3723 move it out, because we need to report the stop event to GDB. For
3724 example, if the user puts a breakpoint in the jump pad, it's
3725 because she wants to debug it. */
3728 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
3730 struct thread_info
*thread
= (struct thread_info
*) entry
;
3731 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3733 if (lwp
->suspended
!= 0)
3735 internal_error (__FILE__
, __LINE__
,
3736 "LWP %ld is suspended, suspended=%d\n",
3737 lwpid_of (thread
), lwp
->suspended
);
3739 gdb_assert (lwp
->stopped
);
3741 /* Allow debugging the jump pad, gdb_collect, etc.. */
3742 return (supports_fast_tracepoints ()
3743 && agent_loaded_p ()
3744 && (gdb_breakpoint_here (lwp
->stop_pc
)
3745 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3746 || thread
->last_resume_kind
== resume_step
)
3747 && linux_fast_tracepoint_collecting (lwp
, NULL
));
3751 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
3753 struct thread_info
*thread
= (struct thread_info
*) entry
;
3754 struct thread_info
*saved_thread
;
3755 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3758 if (lwp
->suspended
!= 0)
3760 internal_error (__FILE__
, __LINE__
,
3761 "LWP %ld is suspended, suspended=%d\n",
3762 lwpid_of (thread
), lwp
->suspended
);
3764 gdb_assert (lwp
->stopped
);
3766 /* For gdb_breakpoint_here. */
3767 saved_thread
= current_thread
;
3768 current_thread
= thread
;
3770 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
3772 /* Allow debugging the jump pad, gdb_collect, etc. */
3773 if (!gdb_breakpoint_here (lwp
->stop_pc
)
3774 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
3775 && thread
->last_resume_kind
!= resume_step
3776 && maybe_move_out_of_jump_pad (lwp
, wstat
))
3779 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
3784 lwp
->status_pending_p
= 0;
3785 enqueue_one_deferred_signal (lwp
, wstat
);
3788 debug_printf ("Signal %d for LWP %ld deferred "
3790 WSTOPSIG (*wstat
), lwpid_of (thread
));
3793 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
3796 lwp_suspended_inc (lwp
);
3798 current_thread
= saved_thread
;
3802 lwp_running (struct inferior_list_entry
*entry
, void *data
)
3804 struct thread_info
*thread
= (struct thread_info
*) entry
;
3805 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3807 if (lwp_is_marked_dead (lwp
))
3814 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
3815 If SUSPEND, then also increase the suspend count of every LWP,
3819 stop_all_lwps (int suspend
, struct lwp_info
*except
)
3821 /* Should not be called recursively. */
3822 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
3827 debug_printf ("stop_all_lwps (%s, except=%s)\n",
3828 suspend
? "stop-and-suspend" : "stop",
3830 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
3834 stopping_threads
= (suspend
3835 ? STOPPING_AND_SUSPENDING_THREADS
3836 : STOPPING_THREADS
);
3839 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
3841 find_inferior (&all_threads
, send_sigstop_callback
, except
);
3842 wait_for_sigstop ();
3843 stopping_threads
= NOT_STOPPING_THREADS
;
3847 debug_printf ("stop_all_lwps done, setting stopping_threads "
3848 "back to !stopping\n");
3853 /* Enqueue one signal in the chain of signals which need to be
3854 delivered to this process on next resume. */
3857 enqueue_pending_signal (struct lwp_info
*lwp
, int signal
, siginfo_t
*info
)
3859 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
3861 p_sig
->prev
= lwp
->pending_signals
;
3862 p_sig
->signal
= signal
;
3864 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3866 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3867 lwp
->pending_signals
= p_sig
;
3870 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
3871 SIGNAL is nonzero, give it that signal. */
3874 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
3875 int step
, int signal
, siginfo_t
*info
)
3877 struct thread_info
*thread
= get_lwp_thread (lwp
);
3878 struct thread_info
*saved_thread
;
3879 int fast_tp_collecting
;
3880 struct process_info
*proc
= get_thread_process (thread
);
3882 /* Note that target description may not be initialised
3883 (proc->tdesc == NULL) at this point because the program hasn't
3884 stopped at the first instruction yet. It means GDBserver skips
3885 the extra traps from the wrapper program (see option --wrapper).
3886 Code in this function that requires register access should be
3887 guarded by proc->tdesc == NULL or something else. */
3889 if (lwp
->stopped
== 0)
3892 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
3894 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
3896 /* Cancel actions that rely on GDB not changing the PC (e.g., the
3897 user used the "jump" command, or "set $pc = foo"). */
3898 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
3900 /* Collecting 'while-stepping' actions doesn't make sense
3902 release_while_stepping_state_list (thread
);
3905 /* If we have pending signals or status, and a new signal, enqueue the
3906 signal. Also enqueue the signal if we are waiting to reinsert a
3907 breakpoint; it will be picked up again below. */
3909 && (lwp
->status_pending_p
3910 || lwp
->pending_signals
!= NULL
3911 || lwp
->bp_reinsert
!= 0
3912 || fast_tp_collecting
))
3914 struct pending_signals
*p_sig
= XNEW (struct pending_signals
);
3916 p_sig
->prev
= lwp
->pending_signals
;
3917 p_sig
->signal
= signal
;
3919 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3921 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3922 lwp
->pending_signals
= p_sig
;
3925 if (lwp
->status_pending_p
)
3928 debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);"
3929 " has pending status\n",
3930 lwpid_of (thread
), step
? "step" : "continue", signal
,
3931 lwp
->stop_expected
? "expected" : "not expected");
3935 saved_thread
= current_thread
;
3936 current_thread
= thread
;
3939 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
3940 lwpid_of (thread
), step
? "step" : "continue", signal
,
3941 lwp
->stop_expected
? "expected" : "not expected");
3943 /* This bit needs some thinking about. If we get a signal that
3944 we must report while a single-step reinsert is still pending,
3945 we often end up resuming the thread. It might be better to
3946 (ew) allow a stack of pending events; then we could be sure that
3947 the reinsert happened right away and not lose any signals.
3949 Making this stack would also shrink the window in which breakpoints are
3950 uninserted (see comment in linux_wait_for_lwp) but not enough for
3951 complete correctness, so it won't solve that problem. It may be
3952 worthwhile just to solve this one, however. */
3953 if (lwp
->bp_reinsert
!= 0)
3956 debug_printf (" pending reinsert at 0x%s\n",
3957 paddress (lwp
->bp_reinsert
));
3959 if (can_hardware_single_step ())
3961 if (fast_tp_collecting
== 0)
3964 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
3966 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
3973 /* Postpone any pending signal. It was enqueued above. */
3977 if (fast_tp_collecting
== 1)
3980 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3981 " (exit-jump-pad-bkpt)\n",
3984 /* Postpone any pending signal. It was enqueued above. */
3987 else if (fast_tp_collecting
== 2)
3990 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3991 " single-stepping\n",
3994 if (can_hardware_single_step ())
3998 internal_error (__FILE__
, __LINE__
,
3999 "moving out of jump pad single-stepping"
4000 " not implemented on this target");
4003 /* Postpone any pending signal. It was enqueued above. */
4007 /* If we have while-stepping actions in this thread set it stepping.
4008 If we have a signal to deliver, it may or may not be set to
4009 SIG_IGN, we don't know. Assume so, and allow collecting
4010 while-stepping into a signal handler. A possible smart thing to
4011 do would be to set an internal breakpoint at the signal return
4012 address, continue, and carry on catching this while-stepping
4013 action only when that breakpoint is hit. A future
4015 if (thread
->while_stepping
!= NULL
4016 && can_hardware_single_step ())
4019 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4024 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
4026 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
4028 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
4032 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
4033 (long) lwp
->stop_pc
);
4037 /* If we have pending signals, consume one unless we are trying to
4038 reinsert a breakpoint or we're trying to finish a fast tracepoint
4040 if (lwp
->pending_signals
!= NULL
4041 && lwp
->bp_reinsert
== 0
4042 && fast_tp_collecting
== 0)
4044 struct pending_signals
**p_sig
;
4046 p_sig
= &lwp
->pending_signals
;
4047 while ((*p_sig
)->prev
!= NULL
)
4048 p_sig
= &(*p_sig
)->prev
;
4050 signal
= (*p_sig
)->signal
;
4051 if ((*p_sig
)->info
.si_signo
!= 0)
4052 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4059 if (the_low_target
.prepare_to_resume
!= NULL
)
4060 the_low_target
.prepare_to_resume (lwp
);
4062 regcache_invalidate_thread (thread
);
4064 lwp
->stepping
= step
;
4065 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (thread
),
4066 (PTRACE_TYPE_ARG3
) 0,
4067 /* Coerce to a uintptr_t first to avoid potential gcc warning
4068 of coercing an 8 byte integer to a 4 byte pointer. */
4069 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
4071 current_thread
= saved_thread
;
4073 perror_with_name ("resuming thread");
4075 /* Successfully resumed. Clear state that no longer makes sense,
4076 and mark the LWP as running. Must not do this before resuming
4077 otherwise if that fails other code will be confused. E.g., we'd
4078 later try to stop the LWP and hang forever waiting for a stop
4079 status. Note that we must not throw after this is cleared,
4080 otherwise handle_zombie_lwp_error would get confused. */
4082 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4085 /* Called when we try to resume a stopped LWP and that errors out. If
4086 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4087 or about to become), discard the error, clear any pending status
4088 the LWP may have, and return true (we'll collect the exit status
4089 soon enough). Otherwise, return false. */
4092 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
4094 struct thread_info
*thread
= get_lwp_thread (lp
);
4096 /* If we get an error after resuming the LWP successfully, we'd
4097 confuse !T state for the LWP being gone. */
4098 gdb_assert (lp
->stopped
);
4100 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4101 because even if ptrace failed with ESRCH, the tracee may be "not
4102 yet fully dead", but already refusing ptrace requests. In that
4103 case the tracee has 'R (Running)' state for a little bit
4104 (observed in Linux 3.18). See also the note on ESRCH in the
4105 ptrace(2) man page. Instead, check whether the LWP has any state
4106 other than ptrace-stopped. */
4108 /* Don't assume anything if /proc/PID/status can't be read. */
4109 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
4111 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
4112 lp
->status_pending_p
= 0;
4118 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4119 disappears while we try to resume it. */
4122 linux_resume_one_lwp (struct lwp_info
*lwp
,
4123 int step
, int signal
, siginfo_t
*info
)
4127 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
4129 CATCH (ex
, RETURN_MASK_ERROR
)
4131 if (!check_ptrace_stopped_lwp_gone (lwp
))
4132 throw_exception (ex
);
4137 struct thread_resume_array
4139 struct thread_resume
*resume
;
4143 /* This function is called once per thread via find_inferior.
4144 ARG is a pointer to a thread_resume_array struct.
4145 We look up the thread specified by ENTRY in ARG, and mark the thread
4146 with a pointer to the appropriate resume request.
4148 This algorithm is O(threads * resume elements), but resume elements
4149 is small (and will remain small at least until GDB supports thread
4153 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
4155 struct thread_info
*thread
= (struct thread_info
*) entry
;
4156 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4158 struct thread_resume_array
*r
;
4160 r
= (struct thread_resume_array
*) arg
;
4162 for (ndx
= 0; ndx
< r
->n
; ndx
++)
4164 ptid_t ptid
= r
->resume
[ndx
].thread
;
4165 if (ptid_equal (ptid
, minus_one_ptid
)
4166 || ptid_equal (ptid
, entry
->id
)
4167 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4169 || (ptid_get_pid (ptid
) == pid_of (thread
)
4170 && (ptid_is_pid (ptid
)
4171 || ptid_get_lwp (ptid
) == -1)))
4173 if (r
->resume
[ndx
].kind
== resume_stop
4174 && thread
->last_resume_kind
== resume_stop
)
4177 debug_printf ("already %s LWP %ld at GDB's request\n",
4178 (thread
->last_status
.kind
4179 == TARGET_WAITKIND_STOPPED
)
4187 lwp
->resume
= &r
->resume
[ndx
];
4188 thread
->last_resume_kind
= lwp
->resume
->kind
;
4190 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
4191 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
4193 /* If we had a deferred signal to report, dequeue one now.
4194 This can happen if LWP gets more than one signal while
4195 trying to get out of a jump pad. */
4197 && !lwp
->status_pending_p
4198 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
4200 lwp
->status_pending_p
= 1;
4203 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4204 "leaving status pending.\n",
4205 WSTOPSIG (lwp
->status_pending
),
4213 /* No resume action for this thread. */
4219 /* find_inferior callback for linux_resume.
4220 Set *FLAG_P if this lwp has an interesting status pending. */
4223 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
4225 struct thread_info
*thread
= (struct thread_info
*) entry
;
4226 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4228 /* LWPs which will not be resumed are not interesting, because
4229 we might not wait for them next time through linux_wait. */
4230 if (lwp
->resume
== NULL
)
4233 if (thread_still_has_status_pending_p (thread
))
4234 * (int *) flag_p
= 1;
4239 /* Return 1 if this lwp that GDB wants running is stopped at an
4240 internal breakpoint that we need to step over. It assumes that any
4241 required STOP_PC adjustment has already been propagated to the
4242 inferior's regcache. */
4245 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
4247 struct thread_info
*thread
= (struct thread_info
*) entry
;
4248 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4249 struct thread_info
*saved_thread
;
4251 struct process_info
*proc
= get_thread_process (thread
);
4253 /* GDBserver is skipping the extra traps from the wrapper program,
4254 don't have to do step over. */
4255 if (proc
->tdesc
== NULL
)
4258 /* LWPs which will not be resumed are not interesting, because we
4259 might not wait for them next time through linux_wait. */
4264 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4269 if (thread
->last_resume_kind
== resume_stop
)
4272 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4278 gdb_assert (lwp
->suspended
>= 0);
4283 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4288 if (!lwp
->need_step_over
)
4291 debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread
));
4294 if (lwp
->status_pending_p
)
4297 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4303 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4307 /* If the PC has changed since we stopped, then don't do anything,
4308 and let the breakpoint/tracepoint be hit. This happens if, for
4309 instance, GDB handled the decr_pc_after_break subtraction itself,
4310 GDB is OOL stepping this thread, or the user has issued a "jump"
4311 command, or poked thread's registers herself. */
4312 if (pc
!= lwp
->stop_pc
)
4315 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4316 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4318 paddress (lwp
->stop_pc
), paddress (pc
));
4320 lwp
->need_step_over
= 0;
4324 saved_thread
= current_thread
;
4325 current_thread
= thread
;
4327 /* We can only step over breakpoints we know about. */
4328 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4330 /* Don't step over a breakpoint that GDB expects to hit
4331 though. If the condition is being evaluated on the target's side
4332 and it evaluate to false, step over this breakpoint as well. */
4333 if (gdb_breakpoint_here (pc
)
4334 && gdb_condition_true_at_breakpoint (pc
)
4335 && gdb_no_commands_at_breakpoint (pc
))
4338 debug_printf ("Need step over [LWP %ld]? yes, but found"
4339 " GDB breakpoint at 0x%s; skipping step over\n",
4340 lwpid_of (thread
), paddress (pc
));
4342 current_thread
= saved_thread
;
4348 debug_printf ("Need step over [LWP %ld]? yes, "
4349 "found breakpoint at 0x%s\n",
4350 lwpid_of (thread
), paddress (pc
));
4352 /* We've found an lwp that needs stepping over --- return 1 so
4353 that find_inferior stops looking. */
4354 current_thread
= saved_thread
;
4356 /* If the step over is cancelled, this is set again. */
4357 lwp
->need_step_over
= 0;
4362 current_thread
= saved_thread
;
4365 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4367 lwpid_of (thread
), paddress (pc
));
4372 /* Start a step-over operation on LWP. When LWP stopped at a
4373 breakpoint, to make progress, we need to remove the breakpoint out
4374 of the way. If we let other threads run while we do that, they may
4375 pass by the breakpoint location and miss hitting it. To avoid
4376 that, a step-over momentarily stops all threads while LWP is
4377 single-stepped while the breakpoint is temporarily uninserted from
4378 the inferior. When the single-step finishes, we reinsert the
4379 breakpoint, and let all threads that are supposed to be running,
4382 On targets that don't support hardware single-step, we don't
4383 currently support full software single-stepping. Instead, we only
4384 support stepping over the thread event breakpoint, by asking the
4385 low target where to place a reinsert breakpoint. Since this
4386 routine assumes the breakpoint being stepped over is a thread event
4387 breakpoint, it usually assumes the return address of the current
4388 function is a good enough place to set the reinsert breakpoint. */
4391 start_step_over (struct lwp_info
*lwp
)
4393 struct thread_info
*thread
= get_lwp_thread (lwp
);
4394 struct thread_info
*saved_thread
;
4399 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4402 stop_all_lwps (1, lwp
);
4404 if (lwp
->suspended
!= 0)
4406 internal_error (__FILE__
, __LINE__
,
4407 "LWP %ld suspended=%d\n", lwpid_of (thread
),
4412 debug_printf ("Done stopping all threads for step-over.\n");
4414 /* Note, we should always reach here with an already adjusted PC,
4415 either by GDB (if we're resuming due to GDB's request), or by our
4416 caller, if we just finished handling an internal breakpoint GDB
4417 shouldn't care about. */
4420 saved_thread
= current_thread
;
4421 current_thread
= thread
;
4423 lwp
->bp_reinsert
= pc
;
4424 uninsert_breakpoints_at (pc
);
4425 uninsert_fast_tracepoint_jumps_at (pc
);
4427 if (can_hardware_single_step ())
4433 CORE_ADDR raddr
= (*the_low_target
.breakpoint_reinsert_addr
) ();
4434 set_reinsert_breakpoint (raddr
);
4438 current_thread
= saved_thread
;
4440 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4442 /* Require next event from this LWP. */
4443 step_over_bkpt
= thread
->entry
.id
;
4447 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4448 start_step_over, if still there, and delete any reinsert
4449 breakpoints we've set, on non hardware single-step targets. */
4452 finish_step_over (struct lwp_info
*lwp
)
4454 if (lwp
->bp_reinsert
!= 0)
4457 debug_printf ("Finished step over.\n");
4459 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4460 may be no breakpoint to reinsert there by now. */
4461 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4462 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4464 lwp
->bp_reinsert
= 0;
4466 /* Delete any software-single-step reinsert breakpoints. No
4467 longer needed. We don't have to worry about other threads
4468 hitting this trap, and later not being able to explain it,
4469 because we were stepping over a breakpoint, and we hold all
4470 threads but LWP stopped while doing that. */
4471 if (!can_hardware_single_step ())
4472 delete_reinsert_breakpoints ();
4474 step_over_bkpt
= null_ptid
;
4481 /* If there's a step over in progress, wait until all threads stop
4482 (that is, until the stepping thread finishes its step), and
4483 unsuspend all lwps. The stepping thread ends with its status
4484 pending, which is processed later when we get back to processing
4488 complete_ongoing_step_over (void)
4490 if (!ptid_equal (step_over_bkpt
, null_ptid
))
4492 struct lwp_info
*lwp
;
4497 debug_printf ("detach: step over in progress, finish it first\n");
4499 /* Passing NULL_PTID as filter indicates we want all events to
4500 be left pending. Eventually this returns when there are no
4501 unwaited-for children left. */
4502 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
4504 gdb_assert (ret
== -1);
4506 lwp
= find_lwp_pid (step_over_bkpt
);
4508 finish_step_over (lwp
);
4509 step_over_bkpt
= null_ptid
;
4510 unsuspend_all_lwps (lwp
);
4514 /* This function is called once per thread. We check the thread's resume
4515 request, which will tell us whether to resume, step, or leave the thread
4516 stopped; and what signal, if any, it should be sent.
4518 For threads which we aren't explicitly told otherwise, we preserve
4519 the stepping flag; this is used for stepping over gdbserver-placed
4522 If pending_flags was set in any thread, we queue any needed
4523 signals, since we won't actually resume. We already have a pending
4524 event to report, so we don't need to preserve any step requests;
4525 they should be re-issued if necessary. */
4528 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
4530 struct thread_info
*thread
= (struct thread_info
*) entry
;
4531 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4533 int leave_all_stopped
= * (int *) arg
;
4536 if (lwp
->resume
== NULL
)
4539 if (lwp
->resume
->kind
== resume_stop
)
4542 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4547 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
4549 /* Stop the thread, and wait for the event asynchronously,
4550 through the event loop. */
4556 debug_printf ("already stopped LWP %ld\n",
4559 /* The LWP may have been stopped in an internal event that
4560 was not meant to be notified back to GDB (e.g., gdbserver
4561 breakpoint), so we should be reporting a stop event in
4564 /* If the thread already has a pending SIGSTOP, this is a
4565 no-op. Otherwise, something later will presumably resume
4566 the thread and this will cause it to cancel any pending
4567 operation, due to last_resume_kind == resume_stop. If
4568 the thread already has a pending status to report, we
4569 will still report it the next time we wait - see
4570 status_pending_p_callback. */
4572 /* If we already have a pending signal to report, then
4573 there's no need to queue a SIGSTOP, as this means we're
4574 midway through moving the LWP out of the jumppad, and we
4575 will report the pending signal as soon as that is
4577 if (lwp
->pending_signals_to_report
== NULL
)
4581 /* For stop requests, we're done. */
4583 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4587 /* If this thread which is about to be resumed has a pending status,
4588 then don't resume it - we can just report the pending status.
4589 Likewise if it is suspended, because e.g., another thread is
4590 stepping past a breakpoint. Make sure to queue any signals that
4591 would otherwise be sent. In all-stop mode, we do this decision
4592 based on if *any* thread has a pending status. If there's a
4593 thread that needs the step-over-breakpoint dance, then don't
4594 resume any other thread but that particular one. */
4595 leave_pending
= (lwp
->suspended
4596 || lwp
->status_pending_p
4597 || leave_all_stopped
);
4602 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
4604 step
= (lwp
->resume
->kind
== resume_step
);
4605 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
4610 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
4612 /* If we have a new signal, enqueue the signal. */
4613 if (lwp
->resume
->sig
!= 0)
4615 struct pending_signals
*p_sig
= XCNEW (struct pending_signals
);
4617 p_sig
->prev
= lwp
->pending_signals
;
4618 p_sig
->signal
= lwp
->resume
->sig
;
4620 /* If this is the same signal we were previously stopped by,
4621 make sure to queue its siginfo. We can ignore the return
4622 value of ptrace; if it fails, we'll skip
4623 PTRACE_SETSIGINFO. */
4624 if (WIFSTOPPED (lwp
->last_status
)
4625 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
4626 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4629 lwp
->pending_signals
= p_sig
;
4633 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4639 linux_resume (struct thread_resume
*resume_info
, size_t n
)
4641 struct thread_resume_array array
= { resume_info
, n
};
4642 struct thread_info
*need_step_over
= NULL
;
4644 int leave_all_stopped
;
4649 debug_printf ("linux_resume:\n");
4652 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
4654 /* If there is a thread which would otherwise be resumed, which has
4655 a pending status, then don't resume any threads - we can just
4656 report the pending status. Make sure to queue any signals that
4657 would otherwise be sent. In non-stop mode, we'll apply this
4658 logic to each thread individually. We consume all pending events
4659 before considering to start a step-over (in all-stop). */
4662 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
4664 /* If there is a thread which would otherwise be resumed, which is
4665 stopped at a breakpoint that needs stepping over, then don't
4666 resume any threads - have it step over the breakpoint with all
4667 other threads stopped, then resume all threads again. Make sure
4668 to queue any signals that would otherwise be delivered or
4670 if (!any_pending
&& supports_breakpoints ())
4672 = (struct thread_info
*) find_inferior (&all_threads
,
4673 need_step_over_p
, NULL
);
4675 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
4679 if (need_step_over
!= NULL
)
4680 debug_printf ("Not resuming all, need step over\n");
4681 else if (any_pending
)
4682 debug_printf ("Not resuming, all-stop and found "
4683 "an LWP with pending status\n");
4685 debug_printf ("Resuming, no pending status or step over needed\n");
4688 /* Even if we're leaving threads stopped, queue all signals we'd
4689 otherwise deliver. */
4690 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
4693 start_step_over (get_thread_lwp (need_step_over
));
4697 debug_printf ("linux_resume done\n");
4702 /* This function is called once per thread. We check the thread's
4703 last resume request, which will tell us whether to resume, step, or
4704 leave the thread stopped. Any signal the client requested to be
4705 delivered has already been enqueued at this point.
4707 If any thread that GDB wants running is stopped at an internal
4708 breakpoint that needs stepping over, we start a step-over operation
4709 on that particular thread, and leave all others stopped. */
4712 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4714 struct thread_info
*thread
= (struct thread_info
*) entry
;
4715 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4722 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
4727 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
4731 if (thread
->last_resume_kind
== resume_stop
4732 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
4735 debug_printf (" client wants LWP to remain %ld stopped\n",
4740 if (lwp
->status_pending_p
)
4743 debug_printf (" LWP %ld has pending status, leaving stopped\n",
4748 gdb_assert (lwp
->suspended
>= 0);
4753 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
4757 if (thread
->last_resume_kind
== resume_stop
4758 && lwp
->pending_signals_to_report
== NULL
4759 && lwp
->collecting_fast_tracepoint
== 0)
4761 /* We haven't reported this LWP as stopped yet (otherwise, the
4762 last_status.kind check above would catch it, and we wouldn't
4763 reach here. This LWP may have been momentarily paused by a
4764 stop_all_lwps call while handling for example, another LWP's
4765 step-over. In that case, the pending expected SIGSTOP signal
4766 that was queued at vCont;t handling time will have already
4767 been consumed by wait_for_sigstop, and so we need to requeue
4768 another one here. Note that if the LWP already has a SIGSTOP
4769 pending, this is a no-op. */
4772 debug_printf ("Client wants LWP %ld to stop. "
4773 "Making sure it has a SIGSTOP pending\n",
4779 if (thread
->last_resume_kind
== resume_step
)
4782 debug_printf (" stepping LWP %ld, client wants it stepping\n",
4786 else if (lwp
->bp_reinsert
!= 0)
4789 debug_printf (" stepping LWP %ld, reinsert set\n",
4796 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4801 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4803 struct thread_info
*thread
= (struct thread_info
*) entry
;
4804 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4809 lwp_suspended_decr (lwp
);
4811 return proceed_one_lwp (entry
, except
);
4814 /* When we finish a step-over, set threads running again. If there's
4815 another thread that may need a step-over, now's the time to start
4816 it. Eventually, we'll move all threads past their breakpoints. */
4819 proceed_all_lwps (void)
4821 struct thread_info
*need_step_over
;
4823 /* If there is a thread which would otherwise be resumed, which is
4824 stopped at a breakpoint that needs stepping over, then don't
4825 resume any threads - have it step over the breakpoint with all
4826 other threads stopped, then resume all threads again. */
4828 if (supports_breakpoints ())
4831 = (struct thread_info
*) find_inferior (&all_threads
,
4832 need_step_over_p
, NULL
);
4834 if (need_step_over
!= NULL
)
4837 debug_printf ("proceed_all_lwps: found "
4838 "thread %ld needing a step-over\n",
4839 lwpid_of (need_step_over
));
4841 start_step_over (get_thread_lwp (need_step_over
));
4847 debug_printf ("Proceeding, no step-over needed\n");
4849 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
4852 /* Stopped LWPs that the client wanted to be running, that don't have
4853 pending statuses, are set to run again, except for EXCEPT, if not
4854 NULL. This undoes a stop_all_lwps call. */
4857 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
4863 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
4864 lwpid_of (get_lwp_thread (except
)));
4866 debug_printf ("unstopping all lwps\n");
4870 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
4872 find_inferior (&all_threads
, proceed_one_lwp
, except
);
4876 debug_printf ("unstop_all_lwps done\n");
4882 #ifdef HAVE_LINUX_REGSETS
4884 #define use_linux_regsets 1
4886 /* Returns true if REGSET has been disabled. */
4889 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
4891 return (info
->disabled_regsets
!= NULL
4892 && info
->disabled_regsets
[regset
- info
->regsets
]);
4895 /* Disable REGSET. */
4898 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
4902 dr_offset
= regset
- info
->regsets
;
4903 if (info
->disabled_regsets
== NULL
)
4904 info
->disabled_regsets
= (char *) xcalloc (1, info
->num_regsets
);
4905 info
->disabled_regsets
[dr_offset
] = 1;
4909 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
4910 struct regcache
*regcache
)
4912 struct regset_info
*regset
;
4913 int saw_general_regs
= 0;
4917 pid
= lwpid_of (current_thread
);
4918 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4923 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4926 buf
= xmalloc (regset
->size
);
4928 nt_type
= regset
->nt_type
;
4932 iov
.iov_len
= regset
->size
;
4933 data
= (void *) &iov
;
4939 res
= ptrace (regset
->get_request
, pid
,
4940 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4942 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4948 /* If we get EIO on a regset, do not try it again for
4949 this process mode. */
4950 disable_regset (regsets_info
, regset
);
4952 else if (errno
== ENODATA
)
4954 /* ENODATA may be returned if the regset is currently
4955 not "active". This can happen in normal operation,
4956 so suppress the warning in this case. */
4961 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
4968 if (regset
->type
== GENERAL_REGS
)
4969 saw_general_regs
= 1;
4970 regset
->store_function (regcache
, buf
);
4974 if (saw_general_regs
)
4981 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
4982 struct regcache
*regcache
)
4984 struct regset_info
*regset
;
4985 int saw_general_regs
= 0;
4989 pid
= lwpid_of (current_thread
);
4990 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4995 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
4996 || regset
->fill_function
== NULL
)
4999 buf
= xmalloc (regset
->size
);
5001 /* First fill the buffer with the current register set contents,
5002 in case there are any items in the kernel's regset that are
5003 not in gdbserver's regcache. */
5005 nt_type
= regset
->nt_type
;
5009 iov
.iov_len
= regset
->size
;
5010 data
= (void *) &iov
;
5016 res
= ptrace (regset
->get_request
, pid
,
5017 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5019 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
5024 /* Then overlay our cached registers on that. */
5025 regset
->fill_function (regcache
, buf
);
5027 /* Only now do we write the register set. */
5029 res
= ptrace (regset
->set_request
, pid
,
5030 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
5032 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
5040 /* If we get EIO on a regset, do not try it again for
5041 this process mode. */
5042 disable_regset (regsets_info
, regset
);
5044 else if (errno
== ESRCH
)
5046 /* At this point, ESRCH should mean the process is
5047 already gone, in which case we simply ignore attempts
5048 to change its registers. See also the related
5049 comment in linux_resume_one_lwp. */
5055 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5058 else if (regset
->type
== GENERAL_REGS
)
5059 saw_general_regs
= 1;
5062 if (saw_general_regs
)
5068 #else /* !HAVE_LINUX_REGSETS */
5070 #define use_linux_regsets 0
5071 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5072 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5076 /* Return 1 if register REGNO is supported by one of the regset ptrace
5077 calls or 0 if it has to be transferred individually. */
5080 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
5082 unsigned char mask
= 1 << (regno
% 8);
5083 size_t index
= regno
/ 8;
5085 return (use_linux_regsets
5086 && (regs_info
->regset_bitmap
== NULL
5087 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
5090 #ifdef HAVE_LINUX_USRREGS
5093 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
5097 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
5098 error ("Invalid register number %d.", regnum
);
5100 addr
= usrregs
->regmap
[regnum
];
5105 /* Fetch one register. */
5107 fetch_register (const struct usrregs_info
*usrregs
,
5108 struct regcache
*regcache
, int regno
)
5115 if (regno
>= usrregs
->num_regs
)
5117 if ((*the_low_target
.cannot_fetch_register
) (regno
))
5120 regaddr
= register_addr (usrregs
, regno
);
5124 size
= ((register_size (regcache
->tdesc
, regno
)
5125 + sizeof (PTRACE_XFER_TYPE
) - 1)
5126 & -sizeof (PTRACE_XFER_TYPE
));
5127 buf
= (char *) alloca (size
);
5129 pid
= lwpid_of (current_thread
);
5130 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5133 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
5134 ptrace (PTRACE_PEEKUSER
, pid
,
5135 /* Coerce to a uintptr_t first to avoid potential gcc warning
5136 of coercing an 8 byte integer to a 4 byte pointer. */
5137 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
5138 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5140 error ("reading register %d: %s", regno
, strerror (errno
));
5143 if (the_low_target
.supply_ptrace_register
)
5144 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
5146 supply_register (regcache
, regno
, buf
);
5149 /* Store one register. */
5151 store_register (const struct usrregs_info
*usrregs
,
5152 struct regcache
*regcache
, int regno
)
5159 if (regno
>= usrregs
->num_regs
)
5161 if ((*the_low_target
.cannot_store_register
) (regno
))
5164 regaddr
= register_addr (usrregs
, regno
);
5168 size
= ((register_size (regcache
->tdesc
, regno
)
5169 + sizeof (PTRACE_XFER_TYPE
) - 1)
5170 & -sizeof (PTRACE_XFER_TYPE
));
5171 buf
= (char *) alloca (size
);
5172 memset (buf
, 0, size
);
5174 if (the_low_target
.collect_ptrace_register
)
5175 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
5177 collect_register (regcache
, regno
, buf
);
5179 pid
= lwpid_of (current_thread
);
5180 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
5183 ptrace (PTRACE_POKEUSER
, pid
,
5184 /* Coerce to a uintptr_t first to avoid potential gcc warning
5185 about coercing an 8 byte integer to a 4 byte pointer. */
5186 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
5187 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
5190 /* At this point, ESRCH should mean the process is
5191 already gone, in which case we simply ignore attempts
5192 to change its registers. See also the related
5193 comment in linux_resume_one_lwp. */
5197 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
5198 error ("writing register %d: %s", regno
, strerror (errno
));
5200 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
5204 /* Fetch all registers, or just one, from the child process.
5205 If REGNO is -1, do this for all registers, skipping any that are
5206 assumed to have been retrieved by regsets_fetch_inferior_registers,
5207 unless ALL is non-zero.
5208 Otherwise, REGNO specifies which register (so we can save time). */
5210 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
5211 struct regcache
*regcache
, int regno
, int all
)
5213 struct usrregs_info
*usr
= regs_info
->usrregs
;
5217 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5218 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5219 fetch_register (usr
, regcache
, regno
);
5222 fetch_register (usr
, regcache
, regno
);
5225 /* Store our register values back into the inferior.
5226 If REGNO is -1, do this for all registers, skipping any that are
5227 assumed to have been saved by regsets_store_inferior_registers,
5228 unless ALL is non-zero.
5229 Otherwise, REGNO specifies which register (so we can save time). */
5231 usr_store_inferior_registers (const struct regs_info
*regs_info
,
5232 struct regcache
*regcache
, int regno
, int all
)
5234 struct usrregs_info
*usr
= regs_info
->usrregs
;
5238 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
5239 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
5240 store_register (usr
, regcache
, regno
);
5243 store_register (usr
, regcache
, regno
);
5246 #else /* !HAVE_LINUX_USRREGS */
5248 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5249 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5255 linux_fetch_registers (struct regcache
*regcache
, int regno
)
5259 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5263 if (the_low_target
.fetch_register
!= NULL
5264 && regs_info
->usrregs
!= NULL
)
5265 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5266 (*the_low_target
.fetch_register
) (regcache
, regno
);
5268 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5269 if (regs_info
->usrregs
!= NULL
)
5270 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5274 if (the_low_target
.fetch_register
!= NULL
5275 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5278 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5280 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5282 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5283 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5288 linux_store_registers (struct regcache
*regcache
, int regno
)
5292 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5296 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5298 if (regs_info
->usrregs
!= NULL
)
5299 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5303 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5305 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5307 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5308 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5313 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5314 to debugger memory starting at MYADDR. */
5317 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5319 int pid
= lwpid_of (current_thread
);
5320 register PTRACE_XFER_TYPE
*buffer
;
5321 register CORE_ADDR addr
;
5328 /* Try using /proc. Don't bother for one word. */
5329 if (len
>= 3 * sizeof (long))
5333 /* We could keep this file open and cache it - possibly one per
5334 thread. That requires some juggling, but is even faster. */
5335 sprintf (filename
, "/proc/%d/mem", pid
);
5336 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5340 /* If pread64 is available, use it. It's faster if the kernel
5341 supports it (only one syscall), and it's 64-bit safe even on
5342 32-bit platforms (for instance, SPARC debugging a SPARC64
5345 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5348 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5349 bytes
= read (fd
, myaddr
, len
);
5356 /* Some data was read, we'll try to get the rest with ptrace. */
5366 /* Round starting address down to longword boundary. */
5367 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5368 /* Round ending address up; get number of longwords that makes. */
5369 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5370 / sizeof (PTRACE_XFER_TYPE
));
5371 /* Allocate buffer of that many longwords. */
5372 buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5374 /* Read all the longwords */
5376 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5378 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5379 about coercing an 8 byte integer to a 4 byte pointer. */
5380 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5381 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5382 (PTRACE_TYPE_ARG4
) 0);
5388 /* Copy appropriate bytes out of the buffer. */
5391 i
*= sizeof (PTRACE_XFER_TYPE
);
5392 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5394 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5401 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5402 memory at MEMADDR. On failure (cannot write to the inferior)
5403 returns the value of errno. Always succeeds if LEN is zero. */
5406 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5409 /* Round starting address down to longword boundary. */
5410 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5411 /* Round ending address up; get number of longwords that makes. */
5413 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5414 / sizeof (PTRACE_XFER_TYPE
);
5416 /* Allocate buffer of that many longwords. */
5417 register PTRACE_XFER_TYPE
*buffer
= XALLOCAVEC (PTRACE_XFER_TYPE
, count
);
5419 int pid
= lwpid_of (current_thread
);
5423 /* Zero length write always succeeds. */
5429 /* Dump up to four bytes. */
5430 char str
[4 * 2 + 1];
5432 int dump
= len
< 4 ? len
: 4;
5434 for (i
= 0; i
< dump
; i
++)
5436 sprintf (p
, "%02x", myaddr
[i
]);
5441 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5442 str
, (long) memaddr
, pid
);
5445 /* Fill start and end extra bytes of buffer with existing memory data. */
5448 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5449 about coercing an 8 byte integer to a 4 byte pointer. */
5450 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5451 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5452 (PTRACE_TYPE_ARG4
) 0);
5460 = ptrace (PTRACE_PEEKTEXT
, pid
,
5461 /* Coerce to a uintptr_t first to avoid potential gcc warning
5462 about coercing an 8 byte integer to a 4 byte pointer. */
5463 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5464 * sizeof (PTRACE_XFER_TYPE
)),
5465 (PTRACE_TYPE_ARG4
) 0);
5470 /* Copy data to be written over corresponding part of buffer. */
5472 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5475 /* Write the entire buffer. */
5477 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5480 ptrace (PTRACE_POKETEXT
, pid
,
5481 /* Coerce to a uintptr_t first to avoid potential gcc warning
5482 about coercing an 8 byte integer to a 4 byte pointer. */
5483 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5484 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5493 linux_look_up_symbols (void)
5495 #ifdef USE_THREAD_DB
5496 struct process_info
*proc
= current_process ();
5498 if (proc
->priv
->thread_db
!= NULL
)
5501 /* If the kernel supports tracing clones, then we don't need to
5502 use the magic thread event breakpoint to learn about
5504 thread_db_init (!linux_supports_traceclone ());
5509 linux_request_interrupt (void)
5511 extern unsigned long signal_pid
;
5513 /* Send a SIGINT to the process group. This acts just like the user
5514 typed a ^C on the controlling terminal. */
5515 kill (-signal_pid
, SIGINT
);
5518 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5519 to debugger memory starting at MYADDR. */
5522 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5524 char filename
[PATH_MAX
];
5526 int pid
= lwpid_of (current_thread
);
5528 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5530 fd
= open (filename
, O_RDONLY
);
5534 if (offset
!= (CORE_ADDR
) 0
5535 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5538 n
= read (fd
, myaddr
, len
);
5545 /* These breakpoint and watchpoint related wrapper functions simply
5546 pass on the function call if the target has registered a
5547 corresponding function. */
5550 linux_supports_z_point_type (char z_type
)
5552 return (the_low_target
.supports_z_point_type
!= NULL
5553 && the_low_target
.supports_z_point_type (z_type
));
5557 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5558 int size
, struct raw_breakpoint
*bp
)
5560 if (type
== raw_bkpt_type_sw
)
5561 return insert_memory_breakpoint (bp
);
5562 else if (the_low_target
.insert_point
!= NULL
)
5563 return the_low_target
.insert_point (type
, addr
, size
, bp
);
5565 /* Unsupported (see target.h). */
5570 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5571 int size
, struct raw_breakpoint
*bp
)
5573 if (type
== raw_bkpt_type_sw
)
5574 return remove_memory_breakpoint (bp
);
5575 else if (the_low_target
.remove_point
!= NULL
)
5576 return the_low_target
.remove_point (type
, addr
, size
, bp
);
5578 /* Unsupported (see target.h). */
5582 /* Implement the to_stopped_by_sw_breakpoint target_ops
5586 linux_stopped_by_sw_breakpoint (void)
5588 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5590 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
5593 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
5597 linux_supports_stopped_by_sw_breakpoint (void)
5599 return USE_SIGTRAP_SIGINFO
;
5602 /* Implement the to_stopped_by_hw_breakpoint target_ops
5606 linux_stopped_by_hw_breakpoint (void)
5608 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5610 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
5613 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
5617 linux_supports_stopped_by_hw_breakpoint (void)
5619 return USE_SIGTRAP_SIGINFO
;
5622 /* Implement the supports_hardware_single_step target_ops method. */
5625 linux_supports_hardware_single_step (void)
5627 return can_hardware_single_step ();
5631 linux_stopped_by_watchpoint (void)
5633 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5635 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
5639 linux_stopped_data_address (void)
5641 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5643 return lwp
->stopped_data_address
;
5646 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
5647 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
5648 && defined(PT_TEXT_END_ADDR)
5650 /* This is only used for targets that define PT_TEXT_ADDR,
5651 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
5652 the target has different ways of acquiring this information, like
5655 /* Under uClinux, programs are loaded at non-zero offsets, which we need
5656 to tell gdb about. */
5659 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
5661 unsigned long text
, text_end
, data
;
5662 int pid
= lwpid_of (current_thread
);
5666 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
5667 (PTRACE_TYPE_ARG4
) 0);
5668 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
5669 (PTRACE_TYPE_ARG4
) 0);
5670 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
5671 (PTRACE_TYPE_ARG4
) 0);
5675 /* Both text and data offsets produced at compile-time (and so
5676 used by gdb) are relative to the beginning of the program,
5677 with the data segment immediately following the text segment.
5678 However, the actual runtime layout in memory may put the data
5679 somewhere else, so when we send gdb a data base-address, we
5680 use the real data base address and subtract the compile-time
5681 data base-address from it (which is just the length of the
5682 text segment). BSS immediately follows data in both
5685 *data_p
= data
- (text_end
- text
);
5694 linux_qxfer_osdata (const char *annex
,
5695 unsigned char *readbuf
, unsigned const char *writebuf
,
5696 CORE_ADDR offset
, int len
)
5698 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
5701 /* Convert a native/host siginfo object, into/from the siginfo in the
5702 layout of the inferiors' architecture. */
5705 siginfo_fixup (siginfo_t
*siginfo
, void *inf_siginfo
, int direction
)
5709 if (the_low_target
.siginfo_fixup
!= NULL
)
5710 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
5712 /* If there was no callback, or the callback didn't do anything,
5713 then just do a straight memcpy. */
5717 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
5719 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
5724 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
5725 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
5729 char inf_siginfo
[sizeof (siginfo_t
)];
5731 if (current_thread
== NULL
)
5734 pid
= lwpid_of (current_thread
);
5737 debug_printf ("%s siginfo for lwp %d.\n",
5738 readbuf
!= NULL
? "Reading" : "Writing",
5741 if (offset
>= sizeof (siginfo
))
5744 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5747 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
5748 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
5749 inferior with a 64-bit GDBSERVER should look the same as debugging it
5750 with a 32-bit GDBSERVER, we need to convert it. */
5751 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
5753 if (offset
+ len
> sizeof (siginfo
))
5754 len
= sizeof (siginfo
) - offset
;
5756 if (readbuf
!= NULL
)
5757 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
5760 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
5762 /* Convert back to ptrace layout before flushing it out. */
5763 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
5765 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5772 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5773 so we notice when children change state; as the handler for the
5774 sigsuspend in my_waitpid. */
5777 sigchld_handler (int signo
)
5779 int old_errno
= errno
;
5785 /* fprintf is not async-signal-safe, so call write
5787 if (write (2, "sigchld_handler\n",
5788 sizeof ("sigchld_handler\n") - 1) < 0)
5789 break; /* just ignore */
5793 if (target_is_async_p ())
5794 async_file_mark (); /* trigger a linux_wait */
5800 linux_supports_non_stop (void)
5806 linux_async (int enable
)
5808 int previous
= target_is_async_p ();
5811 debug_printf ("linux_async (%d), previous=%d\n",
5814 if (previous
!= enable
)
5817 sigemptyset (&mask
);
5818 sigaddset (&mask
, SIGCHLD
);
5820 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
5824 if (pipe (linux_event_pipe
) == -1)
5826 linux_event_pipe
[0] = -1;
5827 linux_event_pipe
[1] = -1;
5828 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5830 warning ("creating event pipe failed.");
5834 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5835 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5837 /* Register the event loop handler. */
5838 add_file_handler (linux_event_pipe
[0],
5839 handle_target_event
, NULL
);
5841 /* Always trigger a linux_wait. */
5846 delete_file_handler (linux_event_pipe
[0]);
5848 close (linux_event_pipe
[0]);
5849 close (linux_event_pipe
[1]);
5850 linux_event_pipe
[0] = -1;
5851 linux_event_pipe
[1] = -1;
5854 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5861 linux_start_non_stop (int nonstop
)
5863 /* Register or unregister from event-loop accordingly. */
5864 linux_async (nonstop
);
5866 if (target_is_async_p () != (nonstop
!= 0))
5873 linux_supports_multi_process (void)
5878 /* Check if fork events are supported. */
5881 linux_supports_fork_events (void)
5883 return linux_supports_tracefork ();
5886 /* Check if vfork events are supported. */
5889 linux_supports_vfork_events (void)
5891 return linux_supports_tracefork ();
5894 /* Check if exec events are supported. */
5897 linux_supports_exec_events (void)
5899 return linux_supports_traceexec ();
5902 /* Callback for 'find_inferior'. Set the (possibly changed) ptrace
5903 options for the specified lwp. */
5906 reset_lwp_ptrace_options_callback (struct inferior_list_entry
*entry
,
5909 struct thread_info
*thread
= (struct thread_info
*) entry
;
5910 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5914 /* Stop the lwp so we can modify its ptrace options. */
5915 lwp
->must_set_ptrace_flags
= 1;
5916 linux_stop_lwp (lwp
);
5920 /* Already stopped; go ahead and set the ptrace options. */
5921 struct process_info
*proc
= find_process_pid (pid_of (thread
));
5922 int options
= linux_low_ptrace_options (proc
->attached
);
5924 linux_enable_event_reporting (lwpid_of (thread
), options
);
5925 lwp
->must_set_ptrace_flags
= 0;
5931 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
5932 ptrace flags for all inferiors. This is in case the new GDB connection
5933 doesn't support the same set of events that the previous one did. */
5936 linux_handle_new_gdb_connection (void)
5940 /* Request that all the lwps reset their ptrace options. */
5941 find_inferior (&all_threads
, reset_lwp_ptrace_options_callback
, &pid
);
5945 linux_supports_disable_randomization (void)
5947 #ifdef HAVE_PERSONALITY
5955 linux_supports_agent (void)
5961 linux_supports_range_stepping (void)
5963 if (*the_low_target
.supports_range_stepping
== NULL
)
5966 return (*the_low_target
.supports_range_stepping
) ();
5969 /* Enumerate spufs IDs for process PID. */
5971 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
5977 struct dirent
*entry
;
5979 sprintf (path
, "/proc/%ld/fd", pid
);
5980 dir
= opendir (path
);
5985 while ((entry
= readdir (dir
)) != NULL
)
5991 fd
= atoi (entry
->d_name
);
5995 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
5996 if (stat (path
, &st
) != 0)
5998 if (!S_ISDIR (st
.st_mode
))
6001 if (statfs (path
, &stfs
) != 0)
6003 if (stfs
.f_type
!= SPUFS_MAGIC
)
6006 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
6008 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
6018 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6019 object type, using the /proc file system. */
6021 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
6022 unsigned const char *writebuf
,
6023 CORE_ADDR offset
, int len
)
6025 long pid
= lwpid_of (current_thread
);
6030 if (!writebuf
&& !readbuf
)
6038 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
6041 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
6042 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
6047 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
6054 ret
= write (fd
, writebuf
, (size_t) len
);
6056 ret
= read (fd
, readbuf
, (size_t) len
);
6062 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6063 struct target_loadseg
6065 /* Core address to which the segment is mapped. */
6067 /* VMA recorded in the program header. */
6069 /* Size of this segment in memory. */
6073 # if defined PT_GETDSBT
6074 struct target_loadmap
6076 /* Protocol version number, must be zero. */
6078 /* Pointer to the DSBT table, its size, and the DSBT index. */
6079 unsigned *dsbt_table
;
6080 unsigned dsbt_size
, dsbt_index
;
6081 /* Number of segments in this map. */
6083 /* The actual memory map. */
6084 struct target_loadseg segs
[/*nsegs*/];
6086 # define LINUX_LOADMAP PT_GETDSBT
6087 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6088 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6090 struct target_loadmap
6092 /* Protocol version number, must be zero. */
6094 /* Number of segments in this map. */
6096 /* The actual memory map. */
6097 struct target_loadseg segs
[/*nsegs*/];
6099 # define LINUX_LOADMAP PTRACE_GETFDPIC
6100 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6101 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6105 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
6106 unsigned char *myaddr
, unsigned int len
)
6108 int pid
= lwpid_of (current_thread
);
6110 struct target_loadmap
*data
= NULL
;
6111 unsigned int actual_length
, copy_length
;
6113 if (strcmp (annex
, "exec") == 0)
6114 addr
= (int) LINUX_LOADMAP_EXEC
;
6115 else if (strcmp (annex
, "interp") == 0)
6116 addr
= (int) LINUX_LOADMAP_INTERP
;
6120 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
6126 actual_length
= sizeof (struct target_loadmap
)
6127 + sizeof (struct target_loadseg
) * data
->nsegs
;
6129 if (offset
< 0 || offset
> actual_length
)
6132 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
6133 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
6137 # define linux_read_loadmap NULL
6138 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6141 linux_process_qsupported (const char *query
)
6143 if (the_low_target
.process_qsupported
!= NULL
)
6144 the_low_target
.process_qsupported (query
);
6148 linux_supports_tracepoints (void)
6150 if (*the_low_target
.supports_tracepoints
== NULL
)
6153 return (*the_low_target
.supports_tracepoints
) ();
6157 linux_read_pc (struct regcache
*regcache
)
6159 if (the_low_target
.get_pc
== NULL
)
6162 return (*the_low_target
.get_pc
) (regcache
);
6166 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
6168 gdb_assert (the_low_target
.set_pc
!= NULL
);
6170 (*the_low_target
.set_pc
) (regcache
, pc
);
6174 linux_thread_stopped (struct thread_info
*thread
)
6176 return get_thread_lwp (thread
)->stopped
;
6179 /* This exposes stop-all-threads functionality to other modules. */
6182 linux_pause_all (int freeze
)
6184 stop_all_lwps (freeze
, NULL
);
6187 /* This exposes unstop-all-threads functionality to other gdbserver
6191 linux_unpause_all (int unfreeze
)
6193 unstop_all_lwps (unfreeze
, NULL
);
6197 linux_prepare_to_access_memory (void)
6199 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6202 linux_pause_all (1);
6207 linux_done_accessing_memory (void)
6209 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6212 linux_unpause_all (1);
6216 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
6217 CORE_ADDR collector
,
6220 CORE_ADDR
*jump_entry
,
6221 CORE_ADDR
*trampoline
,
6222 ULONGEST
*trampoline_size
,
6223 unsigned char *jjump_pad_insn
,
6224 ULONGEST
*jjump_pad_insn_size
,
6225 CORE_ADDR
*adjusted_insn_addr
,
6226 CORE_ADDR
*adjusted_insn_addr_end
,
6229 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
6230 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
6231 jump_entry
, trampoline
, trampoline_size
,
6232 jjump_pad_insn
, jjump_pad_insn_size
,
6233 adjusted_insn_addr
, adjusted_insn_addr_end
,
6237 static struct emit_ops
*
6238 linux_emit_ops (void)
6240 if (the_low_target
.emit_ops
!= NULL
)
6241 return (*the_low_target
.emit_ops
) ();
6247 linux_get_min_fast_tracepoint_insn_len (void)
6249 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
6252 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6255 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
6256 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
6258 char filename
[PATH_MAX
];
6260 const int auxv_size
= is_elf64
6261 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
6262 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
6264 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
6266 fd
= open (filename
, O_RDONLY
);
6272 while (read (fd
, buf
, auxv_size
) == auxv_size
6273 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6277 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6279 switch (aux
->a_type
)
6282 *phdr_memaddr
= aux
->a_un
.a_val
;
6285 *num_phdr
= aux
->a_un
.a_val
;
6291 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6293 switch (aux
->a_type
)
6296 *phdr_memaddr
= aux
->a_un
.a_val
;
6299 *num_phdr
= aux
->a_un
.a_val
;
6307 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6309 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6310 "phdr_memaddr = %ld, phdr_num = %d",
6311 (long) *phdr_memaddr
, *num_phdr
);
6318 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6321 get_dynamic (const int pid
, const int is_elf64
)
6323 CORE_ADDR phdr_memaddr
, relocation
;
6325 unsigned char *phdr_buf
;
6326 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6328 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6331 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6332 phdr_buf
= (unsigned char *) alloca (num_phdr
* phdr_size
);
6334 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6337 /* Compute relocation: it is expected to be 0 for "regular" executables,
6338 non-zero for PIE ones. */
6340 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6343 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6345 if (p
->p_type
== PT_PHDR
)
6346 relocation
= phdr_memaddr
- p
->p_vaddr
;
6350 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6352 if (p
->p_type
== PT_PHDR
)
6353 relocation
= phdr_memaddr
- p
->p_vaddr
;
6356 if (relocation
== -1)
6358 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6359 any real world executables, including PIE executables, have always
6360 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6361 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6362 or present DT_DEBUG anyway (fpc binaries are statically linked).
6364 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6366 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6371 for (i
= 0; i
< num_phdr
; i
++)
6375 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6377 if (p
->p_type
== PT_DYNAMIC
)
6378 return p
->p_vaddr
+ relocation
;
6382 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6384 if (p
->p_type
== PT_DYNAMIC
)
6385 return p
->p_vaddr
+ relocation
;
6392 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6393 can be 0 if the inferior does not yet have the library list initialized.
6394 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6395 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6398 get_r_debug (const int pid
, const int is_elf64
)
6400 CORE_ADDR dynamic_memaddr
;
6401 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6402 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6405 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6406 if (dynamic_memaddr
== 0)
6409 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6413 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6414 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6418 unsigned char buf
[sizeof (Elf64_Xword
)];
6422 #ifdef DT_MIPS_RLD_MAP
6423 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6425 if (linux_read_memory (dyn
->d_un
.d_val
,
6426 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6431 #endif /* DT_MIPS_RLD_MAP */
6432 #ifdef DT_MIPS_RLD_MAP_REL
6433 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6435 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6436 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6441 #endif /* DT_MIPS_RLD_MAP_REL */
6443 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6444 map
= dyn
->d_un
.d_val
;
6446 if (dyn
->d_tag
== DT_NULL
)
6451 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6452 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6456 unsigned char buf
[sizeof (Elf32_Word
)];
6460 #ifdef DT_MIPS_RLD_MAP
6461 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6463 if (linux_read_memory (dyn
->d_un
.d_val
,
6464 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6469 #endif /* DT_MIPS_RLD_MAP */
6470 #ifdef DT_MIPS_RLD_MAP_REL
6471 if (dyn
->d_tag
== DT_MIPS_RLD_MAP_REL
)
6473 if (linux_read_memory (dyn
->d_un
.d_val
+ dynamic_memaddr
,
6474 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6479 #endif /* DT_MIPS_RLD_MAP_REL */
6481 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6482 map
= dyn
->d_un
.d_val
;
6484 if (dyn
->d_tag
== DT_NULL
)
6488 dynamic_memaddr
+= dyn_size
;
6494 /* Read one pointer from MEMADDR in the inferior. */
6497 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6501 /* Go through a union so this works on either big or little endian
6502 hosts, when the inferior's pointer size is smaller than the size
6503 of CORE_ADDR. It is assumed the inferior's endianness is the
6504 same of the superior's. */
6507 CORE_ADDR core_addr
;
6512 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6515 if (ptr_size
== sizeof (CORE_ADDR
))
6516 *ptr
= addr
.core_addr
;
6517 else if (ptr_size
== sizeof (unsigned int))
6520 gdb_assert_not_reached ("unhandled pointer size");
6525 struct link_map_offsets
6527 /* Offset and size of r_debug.r_version. */
6528 int r_version_offset
;
6530 /* Offset and size of r_debug.r_map. */
6533 /* Offset to l_addr field in struct link_map. */
6536 /* Offset to l_name field in struct link_map. */
6539 /* Offset to l_ld field in struct link_map. */
6542 /* Offset to l_next field in struct link_map. */
6545 /* Offset to l_prev field in struct link_map. */
6549 /* Construct qXfer:libraries-svr4:read reply. */
6552 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
6553 unsigned const char *writebuf
,
6554 CORE_ADDR offset
, int len
)
6557 unsigned document_len
;
6558 struct process_info_private
*const priv
= current_process ()->priv
;
6559 char filename
[PATH_MAX
];
6562 static const struct link_map_offsets lmo_32bit_offsets
=
6564 0, /* r_version offset. */
6565 4, /* r_debug.r_map offset. */
6566 0, /* l_addr offset in link_map. */
6567 4, /* l_name offset in link_map. */
6568 8, /* l_ld offset in link_map. */
6569 12, /* l_next offset in link_map. */
6570 16 /* l_prev offset in link_map. */
6573 static const struct link_map_offsets lmo_64bit_offsets
=
6575 0, /* r_version offset. */
6576 8, /* r_debug.r_map offset. */
6577 0, /* l_addr offset in link_map. */
6578 8, /* l_name offset in link_map. */
6579 16, /* l_ld offset in link_map. */
6580 24, /* l_next offset in link_map. */
6581 32 /* l_prev offset in link_map. */
6583 const struct link_map_offsets
*lmo
;
6584 unsigned int machine
;
6586 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
6587 int allocated
= 1024;
6589 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
6590 int header_done
= 0;
6592 if (writebuf
!= NULL
)
6594 if (readbuf
== NULL
)
6597 pid
= lwpid_of (current_thread
);
6598 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
6599 is_elf64
= elf_64_file_p (filename
, &machine
);
6600 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
6601 ptr_size
= is_elf64
? 8 : 4;
6603 while (annex
[0] != '\0')
6609 sep
= strchr (annex
, '=');
6614 if (len
== 5 && startswith (annex
, "start"))
6616 else if (len
== 4 && startswith (annex
, "prev"))
6620 annex
= strchr (sep
, ';');
6627 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
6634 if (priv
->r_debug
== 0)
6635 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
6637 /* We failed to find DT_DEBUG. Such situation will not change
6638 for this inferior - do not retry it. Report it to GDB as
6639 E01, see for the reasons at the GDB solib-svr4.c side. */
6640 if (priv
->r_debug
== (CORE_ADDR
) -1)
6643 if (priv
->r_debug
!= 0)
6645 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
6646 (unsigned char *) &r_version
,
6647 sizeof (r_version
)) != 0
6650 warning ("unexpected r_debug version %d", r_version
);
6652 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
6653 &lm_addr
, ptr_size
) != 0)
6655 warning ("unable to read r_map from 0x%lx",
6656 (long) priv
->r_debug
+ lmo
->r_map_offset
);
6661 document
= (char *) xmalloc (allocated
);
6662 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
6663 p
= document
+ strlen (document
);
6666 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
6667 &l_name
, ptr_size
) == 0
6668 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
6669 &l_addr
, ptr_size
) == 0
6670 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
6671 &l_ld
, ptr_size
) == 0
6672 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
6673 &l_prev
, ptr_size
) == 0
6674 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
6675 &l_next
, ptr_size
) == 0)
6677 unsigned char libname
[PATH_MAX
];
6679 if (lm_prev
!= l_prev
)
6681 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
6682 (long) lm_prev
, (long) l_prev
);
6686 /* Ignore the first entry even if it has valid name as the first entry
6687 corresponds to the main executable. The first entry should not be
6688 skipped if the dynamic loader was loaded late by a static executable
6689 (see solib-svr4.c parameter ignore_first). But in such case the main
6690 executable does not have PT_DYNAMIC present and this function already
6691 exited above due to failed get_r_debug. */
6694 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
6699 /* Not checking for error because reading may stop before
6700 we've got PATH_MAX worth of characters. */
6702 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
6703 libname
[sizeof (libname
) - 1] = '\0';
6704 if (libname
[0] != '\0')
6706 /* 6x the size for xml_escape_text below. */
6707 size_t len
= 6 * strlen ((char *) libname
);
6712 /* Terminate `<library-list-svr4'. */
6717 while (allocated
< p
- document
+ len
+ 200)
6719 /* Expand to guarantee sufficient storage. */
6720 uintptr_t document_len
= p
- document
;
6722 document
= (char *) xrealloc (document
, 2 * allocated
);
6724 p
= document
+ document_len
;
6727 name
= xml_escape_text ((char *) libname
);
6728 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
6729 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
6730 name
, (unsigned long) lm_addr
,
6731 (unsigned long) l_addr
, (unsigned long) l_ld
);
6742 /* Empty list; terminate `<library-list-svr4'. */
6746 strcpy (p
, "</library-list-svr4>");
6748 document_len
= strlen (document
);
6749 if (offset
< document_len
)
6750 document_len
-= offset
;
6753 if (len
> document_len
)
6756 memcpy (readbuf
, document
+ offset
, len
);
6762 #ifdef HAVE_LINUX_BTRACE
6764 /* See to_disable_btrace target method. */
6767 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
6769 enum btrace_error err
;
6771 err
= linux_disable_btrace (tinfo
);
6772 return (err
== BTRACE_ERR_NONE
? 0 : -1);
6775 /* Encode an Intel(R) Processor Trace configuration. */
6778 linux_low_encode_pt_config (struct buffer
*buffer
,
6779 const struct btrace_data_pt_config
*config
)
6781 buffer_grow_str (buffer
, "<pt-config>\n");
6783 switch (config
->cpu
.vendor
)
6786 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
6787 "model=\"%u\" stepping=\"%u\"/>\n",
6788 config
->cpu
.family
, config
->cpu
.model
,
6789 config
->cpu
.stepping
);
6796 buffer_grow_str (buffer
, "</pt-config>\n");
6799 /* Encode a raw buffer. */
6802 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
6808 /* We use hex encoding - see common/rsp-low.h. */
6809 buffer_grow_str (buffer
, "<raw>\n");
6815 elem
[0] = tohex ((*data
>> 4) & 0xf);
6816 elem
[1] = tohex (*data
++ & 0xf);
6818 buffer_grow (buffer
, elem
, 2);
6821 buffer_grow_str (buffer
, "</raw>\n");
6824 /* See to_read_btrace target method. */
6827 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
6830 struct btrace_data btrace
;
6831 struct btrace_block
*block
;
6832 enum btrace_error err
;
6835 btrace_data_init (&btrace
);
6837 err
= linux_read_btrace (&btrace
, tinfo
, type
);
6838 if (err
!= BTRACE_ERR_NONE
)
6840 if (err
== BTRACE_ERR_OVERFLOW
)
6841 buffer_grow_str0 (buffer
, "E.Overflow.");
6843 buffer_grow_str0 (buffer
, "E.Generic Error.");
6848 switch (btrace
.format
)
6850 case BTRACE_FORMAT_NONE
:
6851 buffer_grow_str0 (buffer
, "E.No Trace.");
6854 case BTRACE_FORMAT_BTS
:
6855 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
6856 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
6859 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
6861 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
6862 paddress (block
->begin
), paddress (block
->end
));
6864 buffer_grow_str0 (buffer
, "</btrace>\n");
6867 case BTRACE_FORMAT_PT
:
6868 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
6869 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
6870 buffer_grow_str (buffer
, "<pt>\n");
6872 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
6874 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
6875 btrace
.variant
.pt
.size
);
6877 buffer_grow_str (buffer
, "</pt>\n");
6878 buffer_grow_str0 (buffer
, "</btrace>\n");
6882 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
6886 btrace_data_fini (&btrace
);
6890 btrace_data_fini (&btrace
);
6894 /* See to_btrace_conf target method. */
6897 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
6898 struct buffer
*buffer
)
6900 const struct btrace_config
*conf
;
6902 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
6903 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
6905 conf
= linux_btrace_conf (tinfo
);
6908 switch (conf
->format
)
6910 case BTRACE_FORMAT_NONE
:
6913 case BTRACE_FORMAT_BTS
:
6914 buffer_xml_printf (buffer
, "<bts");
6915 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
6916 buffer_xml_printf (buffer
, " />\n");
6919 case BTRACE_FORMAT_PT
:
6920 buffer_xml_printf (buffer
, "<pt");
6921 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
6922 buffer_xml_printf (buffer
, "/>\n");
6927 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
6930 #endif /* HAVE_LINUX_BTRACE */
6932 /* See nat/linux-nat.h. */
6935 current_lwp_ptid (void)
6937 return ptid_of (current_thread
);
6940 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
6943 linux_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
6945 if (the_low_target
.breakpoint_kind_from_pc
!= NULL
)
6946 return (*the_low_target
.breakpoint_kind_from_pc
) (pcptr
);
6948 return default_breakpoint_kind_from_pc (pcptr
);
6951 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
6953 static const gdb_byte
*
6954 linux_sw_breakpoint_from_kind (int kind
, int *size
)
6956 gdb_assert (the_low_target
.sw_breakpoint_from_kind
!= NULL
);
6958 return (*the_low_target
.sw_breakpoint_from_kind
) (kind
, size
);
6961 static struct target_ops linux_target_ops
= {
6962 linux_create_inferior
,
6972 linux_fetch_registers
,
6973 linux_store_registers
,
6974 linux_prepare_to_access_memory
,
6975 linux_done_accessing_memory
,
6978 linux_look_up_symbols
,
6979 linux_request_interrupt
,
6981 linux_supports_z_point_type
,
6984 linux_stopped_by_sw_breakpoint
,
6985 linux_supports_stopped_by_sw_breakpoint
,
6986 linux_stopped_by_hw_breakpoint
,
6987 linux_supports_stopped_by_hw_breakpoint
,
6988 linux_supports_hardware_single_step
,
6989 linux_stopped_by_watchpoint
,
6990 linux_stopped_data_address
,
6991 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6992 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6993 && defined(PT_TEXT_END_ADDR)
6998 #ifdef USE_THREAD_DB
6999 thread_db_get_tls_address
,
7004 hostio_last_error_from_errno
,
7007 linux_supports_non_stop
,
7009 linux_start_non_stop
,
7010 linux_supports_multi_process
,
7011 linux_supports_fork_events
,
7012 linux_supports_vfork_events
,
7013 linux_supports_exec_events
,
7014 linux_handle_new_gdb_connection
,
7015 #ifdef USE_THREAD_DB
7016 thread_db_handle_monitor_command
,
7020 linux_common_core_of_thread
,
7022 linux_process_qsupported
,
7023 linux_supports_tracepoints
,
7026 linux_thread_stopped
,
7030 linux_stabilize_threads
,
7031 linux_install_fast_tracepoint_jump_pad
,
7033 linux_supports_disable_randomization
,
7034 linux_get_min_fast_tracepoint_insn_len
,
7035 linux_qxfer_libraries_svr4
,
7036 linux_supports_agent
,
7037 #ifdef HAVE_LINUX_BTRACE
7038 linux_supports_btrace
,
7039 linux_enable_btrace
,
7040 linux_low_disable_btrace
,
7041 linux_low_read_btrace
,
7042 linux_low_btrace_conf
,
7050 linux_supports_range_stepping
,
7051 linux_proc_pid_to_exec_file
,
7052 linux_mntns_open_cloexec
,
7054 linux_mntns_readlink
,
7055 linux_breakpoint_kind_from_pc
,
7056 linux_sw_breakpoint_from_kind
7060 linux_init_signals ()
7062 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
7063 to find what the cancel signal actually is. */
7064 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
7065 signal (__SIGRTMIN
+1, SIG_IGN
);
7069 #ifdef HAVE_LINUX_REGSETS
7071 initialize_regsets_info (struct regsets_info
*info
)
7073 for (info
->num_regsets
= 0;
7074 info
->regsets
[info
->num_regsets
].size
>= 0;
7075 info
->num_regsets
++)
7081 initialize_low (void)
7083 struct sigaction sigchld_action
;
7085 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7086 set_target_ops (&linux_target_ops
);
7088 linux_init_signals ();
7089 linux_ptrace_init_warnings ();
7091 sigchld_action
.sa_handler
= sigchld_handler
;
7092 sigemptyset (&sigchld_action
.sa_mask
);
7093 sigchld_action
.sa_flags
= SA_RESTART
;
7094 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7096 initialize_low_arch ();
7098 linux_check_ptrace_features ();