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
= xmalloc (sizeof (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 int linux_stopped_by_watchpoint (void);
269 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
270 static void proceed_all_lwps (void);
271 static int finish_step_over (struct lwp_info
*lwp
);
272 static int kill_lwp (unsigned long lwpid
, int signo
);
274 /* When the event-loop is doing a step-over, this points at the thread
276 ptid_t step_over_bkpt
;
278 /* True if the low target can hardware single-step. Such targets
279 don't need a BREAKPOINT_REINSERT_ADDR callback. */
282 can_hardware_single_step (void)
284 return (the_low_target
.breakpoint_reinsert_addr
== NULL
);
287 /* True if the low target supports memory breakpoints. If so, we'll
288 have a GET_PC implementation. */
291 supports_breakpoints (void)
293 return (the_low_target
.get_pc
!= NULL
);
296 /* Returns true if this target can support fast tracepoints. This
297 does not mean that the in-process agent has been loaded in the
301 supports_fast_tracepoints (void)
303 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
306 /* True if LWP is stopped in its stepping range. */
309 lwp_in_step_range (struct lwp_info
*lwp
)
311 CORE_ADDR pc
= lwp
->stop_pc
;
313 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
316 struct pending_signals
320 struct pending_signals
*prev
;
323 /* The read/write ends of the pipe registered as waitable file in the
325 static int linux_event_pipe
[2] = { -1, -1 };
327 /* True if we're currently in async mode. */
328 #define target_is_async_p() (linux_event_pipe[0] != -1)
330 static void send_sigstop (struct lwp_info
*lwp
);
331 static void wait_for_sigstop (void);
333 /* Return non-zero if HEADER is a 64-bit ELF file. */
336 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
338 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
339 && header
->e_ident
[EI_MAG1
] == ELFMAG1
340 && header
->e_ident
[EI_MAG2
] == ELFMAG2
341 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
343 *machine
= header
->e_machine
;
344 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
351 /* Return non-zero if FILE is a 64-bit ELF file,
352 zero if the file is not a 64-bit ELF file,
353 and -1 if the file is not accessible or doesn't exist. */
356 elf_64_file_p (const char *file
, unsigned int *machine
)
361 fd
= open (file
, O_RDONLY
);
365 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
372 return elf_64_header_p (&header
, machine
);
375 /* Accepts an integer PID; Returns true if the executable PID is
376 running is a 64-bit ELF file.. */
379 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
383 sprintf (file
, "/proc/%d/exe", pid
);
384 return elf_64_file_p (file
, machine
);
388 delete_lwp (struct lwp_info
*lwp
)
390 struct thread_info
*thr
= get_lwp_thread (lwp
);
393 debug_printf ("deleting %ld\n", lwpid_of (thr
));
396 free (lwp
->arch_private
);
400 /* Add a process to the common process list, and set its private
403 static struct process_info
*
404 linux_add_process (int pid
, int attached
)
406 struct process_info
*proc
;
408 proc
= add_process (pid
, attached
);
409 proc
->priv
= xcalloc (1, sizeof (*proc
->priv
));
411 if (the_low_target
.new_process
!= NULL
)
412 proc
->priv
->arch_private
= the_low_target
.new_process ();
417 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
419 /* Handle a GNU/Linux extended wait response. If we see a clone
420 event, we need to add the new LWP to our list (and return 0 so as
421 not to report the trap to higher layers). */
424 handle_extended_wait (struct lwp_info
*event_lwp
, int wstat
)
426 int event
= linux_ptrace_get_extended_event (wstat
);
427 struct thread_info
*event_thr
= get_lwp_thread (event_lwp
);
428 struct lwp_info
*new_lwp
;
430 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
431 || (event
== PTRACE_EVENT_CLONE
))
434 unsigned long new_pid
;
437 /* Get the pid of the new lwp. */
438 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
441 /* If we haven't already seen the new PID stop, wait for it now. */
442 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
444 /* The new child has a pending SIGSTOP. We can't affect it until it
445 hits the SIGSTOP, but we're already attached. */
447 ret
= my_waitpid (new_pid
, &status
, __WALL
);
450 perror_with_name ("waiting for new child");
451 else if (ret
!= new_pid
)
452 warning ("wait returned unexpected PID %d", ret
);
453 else if (!WIFSTOPPED (status
))
454 warning ("wait returned unexpected status 0x%x", status
);
457 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
459 struct process_info
*parent_proc
;
460 struct process_info
*child_proc
;
461 struct lwp_info
*child_lwp
;
462 struct thread_info
*child_thr
;
463 struct target_desc
*tdesc
;
465 ptid
= ptid_build (new_pid
, new_pid
, 0);
469 debug_printf ("HEW: Got fork event from LWP %ld, "
471 ptid_get_lwp (ptid_of (event_thr
)),
472 ptid_get_pid (ptid
));
475 /* Add the new process to the tables and clone the breakpoint
476 lists of the parent. We need to do this even if the new process
477 will be detached, since we will need the process object and the
478 breakpoints to remove any breakpoints from memory when we
479 detach, and the client side will access registers. */
480 child_proc
= linux_add_process (new_pid
, 0);
481 gdb_assert (child_proc
!= NULL
);
482 child_lwp
= add_lwp (ptid
);
483 gdb_assert (child_lwp
!= NULL
);
484 child_lwp
->stopped
= 1;
485 child_lwp
->must_set_ptrace_flags
= 1;
486 child_lwp
->status_pending_p
= 0;
487 child_thr
= get_lwp_thread (child_lwp
);
488 child_thr
->last_resume_kind
= resume_stop
;
489 child_thr
->last_status
.kind
= TARGET_WAITKIND_STOPPED
;
491 parent_proc
= get_thread_process (event_thr
);
492 child_proc
->attached
= parent_proc
->attached
;
493 clone_all_breakpoints (&child_proc
->breakpoints
,
494 &child_proc
->raw_breakpoints
,
495 parent_proc
->breakpoints
);
497 tdesc
= xmalloc (sizeof (struct target_desc
));
498 copy_target_description (tdesc
, parent_proc
->tdesc
);
499 child_proc
->tdesc
= tdesc
;
501 /* Clone arch-specific process data. */
502 if (the_low_target
.new_fork
!= NULL
)
503 the_low_target
.new_fork (parent_proc
, child_proc
);
505 /* Save fork info in the parent thread. */
506 if (event
== PTRACE_EVENT_FORK
)
507 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
508 else if (event
== PTRACE_EVENT_VFORK
)
509 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
511 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
513 /* The status_pending field contains bits denoting the
514 extended event, so when the pending event is handled,
515 the handler will look at lwp->waitstatus. */
516 event_lwp
->status_pending_p
= 1;
517 event_lwp
->status_pending
= wstat
;
519 /* Report the event. */
524 debug_printf ("HEW: Got clone event "
525 "from LWP %ld, new child is LWP %ld\n",
526 lwpid_of (event_thr
), new_pid
);
528 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
529 new_lwp
= add_lwp (ptid
);
531 /* Either we're going to immediately resume the new thread
532 or leave it stopped. linux_resume_one_lwp is a nop if it
533 thinks the thread is currently running, so set this first
534 before calling linux_resume_one_lwp. */
535 new_lwp
->stopped
= 1;
537 /* If we're suspending all threads, leave this one suspended
539 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
)
540 new_lwp
->suspended
= 1;
542 /* Normally we will get the pending SIGSTOP. But in some cases
543 we might get another signal delivered to the group first.
544 If we do get another signal, be sure not to lose it. */
545 if (WSTOPSIG (status
) != SIGSTOP
)
547 new_lwp
->stop_expected
= 1;
548 new_lwp
->status_pending_p
= 1;
549 new_lwp
->status_pending
= status
;
552 /* Don't report the event. */
555 else if (event
== PTRACE_EVENT_VFORK_DONE
)
557 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
559 /* Report the event. */
563 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
566 /* Return the PC as read from the regcache of LWP, without any
570 get_pc (struct lwp_info
*lwp
)
572 struct thread_info
*saved_thread
;
573 struct regcache
*regcache
;
576 if (the_low_target
.get_pc
== NULL
)
579 saved_thread
= current_thread
;
580 current_thread
= get_lwp_thread (lwp
);
582 regcache
= get_thread_regcache (current_thread
, 1);
583 pc
= (*the_low_target
.get_pc
) (regcache
);
586 debug_printf ("pc is 0x%lx\n", (long) pc
);
588 current_thread
= saved_thread
;
592 /* This function should only be called if LWP got a SIGTRAP.
593 The SIGTRAP could mean several things.
595 On i386, where decr_pc_after_break is non-zero:
597 If we were single-stepping this process using PTRACE_SINGLESTEP, we
598 will get only the one SIGTRAP. The value of $eip will be the next
599 instruction. If the instruction we stepped over was a breakpoint,
600 we need to decrement the PC.
602 If we continue the process using PTRACE_CONT, we will get a
603 SIGTRAP when we hit a breakpoint. The value of $eip will be
604 the instruction after the breakpoint (i.e. needs to be
605 decremented). If we report the SIGTRAP to GDB, we must also
606 report the undecremented PC. If the breakpoint is removed, we
607 must resume at the decremented PC.
609 On a non-decr_pc_after_break machine with hardware or kernel
612 If we either single-step a breakpoint instruction, or continue and
613 hit a breakpoint instruction, our PC will point at the breakpoint
617 check_stopped_by_breakpoint (struct lwp_info
*lwp
)
620 CORE_ADDR sw_breakpoint_pc
;
621 struct thread_info
*saved_thread
;
622 #if USE_SIGTRAP_SIGINFO
626 if (the_low_target
.get_pc
== NULL
)
630 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
632 /* breakpoint_at reads from the current thread. */
633 saved_thread
= current_thread
;
634 current_thread
= get_lwp_thread (lwp
);
636 #if USE_SIGTRAP_SIGINFO
637 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
638 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
640 if (siginfo
.si_signo
== SIGTRAP
)
642 if (siginfo
.si_code
== GDB_ARCH_TRAP_BRKPT
)
646 struct thread_info
*thr
= get_lwp_thread (lwp
);
648 debug_printf ("CSBB: %s stopped by software breakpoint\n",
649 target_pid_to_str (ptid_of (thr
)));
652 /* Back up the PC if necessary. */
653 if (pc
!= sw_breakpoint_pc
)
655 struct regcache
*regcache
656 = get_thread_regcache (current_thread
, 1);
657 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
660 lwp
->stop_pc
= sw_breakpoint_pc
;
661 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
662 current_thread
= saved_thread
;
665 else if (siginfo
.si_code
== TRAP_HWBKPT
)
669 struct thread_info
*thr
= get_lwp_thread (lwp
);
671 debug_printf ("CSBB: %s stopped by hardware "
672 "breakpoint/watchpoint\n",
673 target_pid_to_str (ptid_of (thr
)));
677 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
678 current_thread
= saved_thread
;
681 else if (siginfo
.si_code
== TRAP_TRACE
)
685 struct thread_info
*thr
= get_lwp_thread (lwp
);
687 debug_printf ("CSBB: %s stopped by trace\n",
688 target_pid_to_str (ptid_of (thr
)));
694 /* We may have just stepped a breakpoint instruction. E.g., in
695 non-stop mode, GDB first tells the thread A to step a range, and
696 then the user inserts a breakpoint inside the range. In that
697 case we need to report the breakpoint PC. */
698 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
699 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
703 struct thread_info
*thr
= get_lwp_thread (lwp
);
705 debug_printf ("CSBB: %s stopped by software breakpoint\n",
706 target_pid_to_str (ptid_of (thr
)));
709 /* Back up the PC if necessary. */
710 if (pc
!= sw_breakpoint_pc
)
712 struct regcache
*regcache
713 = get_thread_regcache (current_thread
, 1);
714 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
717 lwp
->stop_pc
= sw_breakpoint_pc
;
718 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
719 current_thread
= saved_thread
;
723 if (hardware_breakpoint_inserted_here (pc
))
727 struct thread_info
*thr
= get_lwp_thread (lwp
);
729 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
730 target_pid_to_str (ptid_of (thr
)));
734 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
735 current_thread
= saved_thread
;
740 current_thread
= saved_thread
;
744 static struct lwp_info
*
745 add_lwp (ptid_t ptid
)
747 struct lwp_info
*lwp
;
749 lwp
= (struct lwp_info
*) xmalloc (sizeof (*lwp
));
750 memset (lwp
, 0, sizeof (*lwp
));
752 if (the_low_target
.new_thread
!= NULL
)
753 the_low_target
.new_thread (lwp
);
755 lwp
->thread
= add_thread (ptid
, lwp
);
760 /* Start an inferior process and returns its pid.
761 ALLARGS is a vector of program-name and args. */
764 linux_create_inferior (char *program
, char **allargs
)
766 struct lwp_info
*new_lwp
;
769 struct cleanup
*restore_personality
770 = maybe_disable_address_space_randomization (disable_randomization
);
772 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
778 perror_with_name ("fork");
783 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
785 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
786 signal (__SIGRTMIN
+ 1, SIG_DFL
);
791 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
792 stdout to stderr so that inferior i/o doesn't corrupt the connection.
793 Also, redirect stdin to /dev/null. */
794 if (remote_connection_is_stdio ())
797 open ("/dev/null", O_RDONLY
);
799 if (write (2, "stdin/stdout redirected\n",
800 sizeof ("stdin/stdout redirected\n") - 1) < 0)
802 /* Errors ignored. */;
806 execv (program
, allargs
);
808 execvp (program
, allargs
);
810 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
816 do_cleanups (restore_personality
);
818 linux_add_process (pid
, 0);
820 ptid
= ptid_build (pid
, pid
, 0);
821 new_lwp
= add_lwp (ptid
);
822 new_lwp
->must_set_ptrace_flags
= 1;
827 /* Implement the arch_setup target_ops method. */
830 linux_arch_setup (void)
832 the_low_target
.arch_setup ();
835 /* Attach to an inferior process. Returns 0 on success, ERRNO on
839 linux_attach_lwp (ptid_t ptid
)
841 struct lwp_info
*new_lwp
;
842 int lwpid
= ptid_get_lwp (ptid
);
844 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
848 new_lwp
= add_lwp (ptid
);
850 /* We need to wait for SIGSTOP before being able to make the next
851 ptrace call on this LWP. */
852 new_lwp
->must_set_ptrace_flags
= 1;
854 if (linux_proc_pid_is_stopped (lwpid
))
857 debug_printf ("Attached to a stopped process\n");
859 /* The process is definitely stopped. It is in a job control
860 stop, unless the kernel predates the TASK_STOPPED /
861 TASK_TRACED distinction, in which case it might be in a
862 ptrace stop. Make sure it is in a ptrace stop; from there we
863 can kill it, signal it, et cetera.
865 First make sure there is a pending SIGSTOP. Since we are
866 already attached, the process can not transition from stopped
867 to running without a PTRACE_CONT; so we know this signal will
868 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
869 probably already in the queue (unless this kernel is old
870 enough to use TASK_STOPPED for ptrace stops); but since
871 SIGSTOP is not an RT signal, it can only be queued once. */
872 kill_lwp (lwpid
, SIGSTOP
);
874 /* Finally, resume the stopped process. This will deliver the
875 SIGSTOP (or a higher priority signal, just like normal
876 PTRACE_ATTACH), which we'll catch later on. */
877 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
880 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
883 There are several cases to consider here:
885 1) gdbserver has already attached to the process and is being notified
886 of a new thread that is being created.
887 In this case we should ignore that SIGSTOP and resume the
888 process. This is handled below by setting stop_expected = 1,
889 and the fact that add_thread sets last_resume_kind ==
892 2) This is the first thread (the process thread), and we're attaching
893 to it via attach_inferior.
894 In this case we want the process thread to stop.
895 This is handled by having linux_attach set last_resume_kind ==
896 resume_stop after we return.
898 If the pid we are attaching to is also the tgid, we attach to and
899 stop all the existing threads. Otherwise, we attach to pid and
900 ignore any other threads in the same group as this pid.
902 3) GDB is connecting to gdbserver and is requesting an enumeration of all
904 In this case we want the thread to stop.
905 FIXME: This case is currently not properly handled.
906 We should wait for the SIGSTOP but don't. Things work apparently
907 because enough time passes between when we ptrace (ATTACH) and when
908 gdb makes the next ptrace call on the thread.
910 On the other hand, if we are currently trying to stop all threads, we
911 should treat the new thread as if we had sent it a SIGSTOP. This works
912 because we are guaranteed that the add_lwp call above added us to the
913 end of the list, and so the new thread has not yet reached
914 wait_for_sigstop (but will). */
915 new_lwp
->stop_expected
= 1;
920 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
921 already attached. Returns true if a new LWP is found, false
925 attach_proc_task_lwp_callback (ptid_t ptid
)
927 /* Is this a new thread? */
928 if (find_thread_ptid (ptid
) == NULL
)
930 int lwpid
= ptid_get_lwp (ptid
);
934 debug_printf ("Found new lwp %d\n", lwpid
);
936 err
= linux_attach_lwp (ptid
);
938 /* Be quiet if we simply raced with the thread exiting. EPERM
939 is returned if the thread's task still exists, and is marked
940 as exited or zombie, as well as other conditions, so in that
941 case, confirm the status in /proc/PID/status. */
943 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
947 debug_printf ("Cannot attach to lwp %d: "
948 "thread is gone (%d: %s)\n",
949 lwpid
, err
, strerror (err
));
954 warning (_("Cannot attach to lwp %d: %s"),
956 linux_ptrace_attach_fail_reason_string (ptid
, err
));
964 /* Attach to PID. If PID is the tgid, attach to it and all
968 linux_attach (unsigned long pid
)
970 ptid_t ptid
= ptid_build (pid
, pid
, 0);
973 /* Attach to PID. We will check for other threads
975 err
= linux_attach_lwp (ptid
);
977 error ("Cannot attach to process %ld: %s",
978 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
980 linux_add_process (pid
, 1);
984 struct thread_info
*thread
;
986 /* Don't ignore the initial SIGSTOP if we just attached to this
987 process. It will be collected by wait shortly. */
988 thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
989 thread
->last_resume_kind
= resume_stop
;
992 /* We must attach to every LWP. If /proc is mounted, use that to
993 find them now. On the one hand, the inferior may be using raw
994 clone instead of using pthreads. On the other hand, even if it
995 is using pthreads, GDB may not be connected yet (thread_db needs
996 to do symbol lookups, through qSymbol). Also, thread_db walks
997 structures in the inferior's address space to find the list of
998 threads/LWPs, and those structures may well be corrupted. Note
999 that once thread_db is loaded, we'll still use it to list threads
1000 and associate pthread info with each LWP. */
1001 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1012 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
1014 struct counter
*counter
= args
;
1016 if (ptid_get_pid (entry
->id
) == counter
->pid
)
1018 if (++counter
->count
> 1)
1026 last_thread_of_process_p (int pid
)
1028 struct counter counter
= { pid
, 0 };
1030 return (find_inferior (&all_threads
,
1031 second_thread_of_pid_p
, &counter
) == NULL
);
1037 linux_kill_one_lwp (struct lwp_info
*lwp
)
1039 struct thread_info
*thr
= get_lwp_thread (lwp
);
1040 int pid
= lwpid_of (thr
);
1042 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1043 there is no signal context, and ptrace(PTRACE_KILL) (or
1044 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1045 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1046 alternative is to kill with SIGKILL. We only need one SIGKILL
1047 per process, not one for each thread. But since we still support
1048 linuxthreads, and we also support debugging programs using raw
1049 clone without CLONE_THREAD, we send one for each thread. For
1050 years, we used PTRACE_KILL only, so we're being a bit paranoid
1051 about some old kernels where PTRACE_KILL might work better
1052 (dubious if there are any such, but that's why it's paranoia), so
1053 we try SIGKILL first, PTRACE_KILL second, and so we're fine
1057 kill_lwp (pid
, SIGKILL
);
1060 int save_errno
= errno
;
1062 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1063 target_pid_to_str (ptid_of (thr
)),
1064 save_errno
? strerror (save_errno
) : "OK");
1068 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1071 int save_errno
= errno
;
1073 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1074 target_pid_to_str (ptid_of (thr
)),
1075 save_errno
? strerror (save_errno
) : "OK");
1079 /* Kill LWP and wait for it to die. */
1082 kill_wait_lwp (struct lwp_info
*lwp
)
1084 struct thread_info
*thr
= get_lwp_thread (lwp
);
1085 int pid
= ptid_get_pid (ptid_of (thr
));
1086 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1091 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1095 linux_kill_one_lwp (lwp
);
1097 /* Make sure it died. Notes:
1099 - The loop is most likely unnecessary.
1101 - We don't use linux_wait_for_event as that could delete lwps
1102 while we're iterating over them. We're not interested in
1103 any pending status at this point, only in making sure all
1104 wait status on the kernel side are collected until the
1107 - We don't use __WALL here as the __WALL emulation relies on
1108 SIGCHLD, and killing a stopped process doesn't generate
1109 one, nor an exit status.
1111 res
= my_waitpid (lwpid
, &wstat
, 0);
1112 if (res
== -1 && errno
== ECHILD
)
1113 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1114 } while (res
> 0 && WIFSTOPPED (wstat
));
1116 /* Even if it was stopped, the child may have already disappeared.
1117 E.g., if it was killed by SIGKILL. */
1118 if (res
< 0 && errno
!= ECHILD
)
1119 perror_with_name ("kill_wait_lwp");
1122 /* Callback for `find_inferior'. Kills an lwp of a given process,
1123 except the leader. */
1126 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1128 struct thread_info
*thread
= (struct thread_info
*) entry
;
1129 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1130 int pid
= * (int *) args
;
1132 if (ptid_get_pid (entry
->id
) != pid
)
1135 /* We avoid killing the first thread here, because of a Linux kernel (at
1136 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1137 the children get a chance to be reaped, it will remain a zombie
1140 if (lwpid_of (thread
) == pid
)
1143 debug_printf ("lkop: is last of process %s\n",
1144 target_pid_to_str (entry
->id
));
1148 kill_wait_lwp (lwp
);
1153 linux_kill (int pid
)
1155 struct process_info
*process
;
1156 struct lwp_info
*lwp
;
1158 process
= find_process_pid (pid
);
1159 if (process
== NULL
)
1162 /* If we're killing a running inferior, make sure it is stopped
1163 first, as PTRACE_KILL will not work otherwise. */
1164 stop_all_lwps (0, NULL
);
1166 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1168 /* See the comment in linux_kill_one_lwp. We did not kill the first
1169 thread in the list, so do so now. */
1170 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1175 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1179 kill_wait_lwp (lwp
);
1181 the_target
->mourn (process
);
1183 /* Since we presently can only stop all lwps of all processes, we
1184 need to unstop lwps of other processes. */
1185 unstop_all_lwps (0, NULL
);
1189 /* Get pending signal of THREAD, for detaching purposes. This is the
1190 signal the thread last stopped for, which we need to deliver to the
1191 thread when detaching, otherwise, it'd be suppressed/lost. */
1194 get_detach_signal (struct thread_info
*thread
)
1196 enum gdb_signal signo
= GDB_SIGNAL_0
;
1198 struct lwp_info
*lp
= get_thread_lwp (thread
);
1200 if (lp
->status_pending_p
)
1201 status
= lp
->status_pending
;
1204 /* If the thread had been suspended by gdbserver, and it stopped
1205 cleanly, then it'll have stopped with SIGSTOP. But we don't
1206 want to deliver that SIGSTOP. */
1207 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1208 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1211 /* Otherwise, we may need to deliver the signal we
1213 status
= lp
->last_status
;
1216 if (!WIFSTOPPED (status
))
1219 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1220 target_pid_to_str (ptid_of (thread
)));
1224 /* Extended wait statuses aren't real SIGTRAPs. */
1225 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1228 debug_printf ("GPS: lwp %s had stopped with extended "
1229 "status: no pending signal\n",
1230 target_pid_to_str (ptid_of (thread
)));
1234 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1236 if (program_signals_p
&& !program_signals
[signo
])
1239 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1240 target_pid_to_str (ptid_of (thread
)),
1241 gdb_signal_to_string (signo
));
1244 else if (!program_signals_p
1245 /* If we have no way to know which signals GDB does not
1246 want to have passed to the program, assume
1247 SIGTRAP/SIGINT, which is GDB's default. */
1248 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1251 debug_printf ("GPS: lwp %s had signal %s, "
1252 "but we don't know if we should pass it. "
1253 "Default to not.\n",
1254 target_pid_to_str (ptid_of (thread
)),
1255 gdb_signal_to_string (signo
));
1261 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1262 target_pid_to_str (ptid_of (thread
)),
1263 gdb_signal_to_string (signo
));
1265 return WSTOPSIG (status
);
1270 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
1272 struct thread_info
*thread
= (struct thread_info
*) entry
;
1273 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1274 int pid
= * (int *) args
;
1277 if (ptid_get_pid (entry
->id
) != pid
)
1280 /* If there is a pending SIGSTOP, get rid of it. */
1281 if (lwp
->stop_expected
)
1284 debug_printf ("Sending SIGCONT to %s\n",
1285 target_pid_to_str (ptid_of (thread
)));
1287 kill_lwp (lwpid_of (thread
), SIGCONT
);
1288 lwp
->stop_expected
= 0;
1291 /* Flush any pending changes to the process's registers. */
1292 regcache_invalidate_thread (thread
);
1294 /* Pass on any pending signal for this thread. */
1295 sig
= get_detach_signal (thread
);
1297 /* Finally, let it resume. */
1298 if (the_low_target
.prepare_to_resume
!= NULL
)
1299 the_low_target
.prepare_to_resume (lwp
);
1300 if (ptrace (PTRACE_DETACH
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1301 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1302 error (_("Can't detach %s: %s"),
1303 target_pid_to_str (ptid_of (thread
)),
1311 linux_detach (int pid
)
1313 struct process_info
*process
;
1315 process
= find_process_pid (pid
);
1316 if (process
== NULL
)
1319 /* Stop all threads before detaching. First, ptrace requires that
1320 the thread is stopped to sucessfully detach. Second, thread_db
1321 may need to uninstall thread event breakpoints from memory, which
1322 only works with a stopped process anyway. */
1323 stop_all_lwps (0, NULL
);
1325 #ifdef USE_THREAD_DB
1326 thread_db_detach (process
);
1329 /* Stabilize threads (move out of jump pads). */
1330 stabilize_threads ();
1332 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
1334 the_target
->mourn (process
);
1336 /* Since we presently can only stop all lwps of all processes, we
1337 need to unstop lwps of other processes. */
1338 unstop_all_lwps (0, NULL
);
1342 /* Remove all LWPs that belong to process PROC from the lwp list. */
1345 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1347 struct thread_info
*thread
= (struct thread_info
*) entry
;
1348 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1349 struct process_info
*process
= proc
;
1351 if (pid_of (thread
) == pid_of (process
))
1358 linux_mourn (struct process_info
*process
)
1360 struct process_info_private
*priv
;
1362 #ifdef USE_THREAD_DB
1363 thread_db_mourn (process
);
1366 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1368 /* Freeing all private data. */
1369 priv
= process
->priv
;
1370 free (priv
->arch_private
);
1372 process
->priv
= NULL
;
1374 remove_process (process
);
1378 linux_join (int pid
)
1383 ret
= my_waitpid (pid
, &status
, 0);
1384 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1386 } while (ret
!= -1 || errno
!= ECHILD
);
1389 /* Return nonzero if the given thread is still alive. */
1391 linux_thread_alive (ptid_t ptid
)
1393 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1395 /* We assume we always know if a thread exits. If a whole process
1396 exited but we still haven't been able to report it to GDB, we'll
1397 hold on to the last lwp of the dead process. */
1404 /* Return 1 if this lwp still has an interesting status pending. If
1405 not (e.g., it had stopped for a breakpoint that is gone), return
1409 thread_still_has_status_pending_p (struct thread_info
*thread
)
1411 struct lwp_info
*lp
= get_thread_lwp (thread
);
1413 if (!lp
->status_pending_p
)
1416 /* If we got a `vCont;t', but we haven't reported a stop yet, do
1417 report any status pending the LWP may have. */
1418 if (thread
->last_resume_kind
== resume_stop
1419 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
1422 if (thread
->last_resume_kind
!= resume_stop
1423 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1424 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1426 struct thread_info
*saved_thread
;
1430 gdb_assert (lp
->last_status
!= 0);
1434 saved_thread
= current_thread
;
1435 current_thread
= thread
;
1437 if (pc
!= lp
->stop_pc
)
1440 debug_printf ("PC of %ld changed\n",
1445 #if !USE_SIGTRAP_SIGINFO
1446 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1447 && !(*the_low_target
.breakpoint_at
) (pc
))
1450 debug_printf ("previous SW breakpoint of %ld gone\n",
1454 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1455 && !hardware_breakpoint_inserted_here (pc
))
1458 debug_printf ("previous HW breakpoint of %ld gone\n",
1464 current_thread
= saved_thread
;
1469 debug_printf ("discarding pending breakpoint status\n");
1470 lp
->status_pending_p
= 0;
1478 /* Return 1 if this lwp has an interesting status pending. */
1480 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1482 struct thread_info
*thread
= (struct thread_info
*) entry
;
1483 struct lwp_info
*lp
= get_thread_lwp (thread
);
1484 ptid_t ptid
= * (ptid_t
*) arg
;
1486 /* Check if we're only interested in events from a specific process
1487 or a specific LWP. */
1488 if (!ptid_match (ptid_of (thread
), ptid
))
1491 if (lp
->status_pending_p
1492 && !thread_still_has_status_pending_p (thread
))
1494 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1498 return lp
->status_pending_p
;
1502 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1504 ptid_t ptid
= *(ptid_t
*) data
;
1507 if (ptid_get_lwp (ptid
) != 0)
1508 lwp
= ptid_get_lwp (ptid
);
1510 lwp
= ptid_get_pid (ptid
);
1512 if (ptid_get_lwp (entry
->id
) == lwp
)
1519 find_lwp_pid (ptid_t ptid
)
1521 struct inferior_list_entry
*thread
1522 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1527 return get_thread_lwp ((struct thread_info
*) thread
);
1530 /* Return the number of known LWPs in the tgid given by PID. */
1535 struct inferior_list_entry
*inf
, *tmp
;
1538 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1540 if (ptid_get_pid (inf
->id
) == pid
)
1547 /* The arguments passed to iterate_over_lwps. */
1549 struct iterate_over_lwps_args
1551 /* The FILTER argument passed to iterate_over_lwps. */
1554 /* The CALLBACK argument passed to iterate_over_lwps. */
1555 iterate_over_lwps_ftype
*callback
;
1557 /* The DATA argument passed to iterate_over_lwps. */
1561 /* Callback for find_inferior used by iterate_over_lwps to filter
1562 calls to the callback supplied to that function. Returning a
1563 nonzero value causes find_inferiors to stop iterating and return
1564 the current inferior_list_entry. Returning zero indicates that
1565 find_inferiors should continue iterating. */
1568 iterate_over_lwps_filter (struct inferior_list_entry
*entry
, void *args_p
)
1570 struct iterate_over_lwps_args
*args
1571 = (struct iterate_over_lwps_args
*) args_p
;
1573 if (ptid_match (entry
->id
, args
->filter
))
1575 struct thread_info
*thr
= (struct thread_info
*) entry
;
1576 struct lwp_info
*lwp
= get_thread_lwp (thr
);
1578 return (*args
->callback
) (lwp
, args
->data
);
1584 /* See nat/linux-nat.h. */
1587 iterate_over_lwps (ptid_t filter
,
1588 iterate_over_lwps_ftype callback
,
1591 struct iterate_over_lwps_args args
= {filter
, callback
, data
};
1592 struct inferior_list_entry
*entry
;
1594 entry
= find_inferior (&all_threads
, iterate_over_lwps_filter
, &args
);
1598 return get_thread_lwp ((struct thread_info
*) entry
);
1601 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1602 their exits until all other threads in the group have exited. */
1605 check_zombie_leaders (void)
1607 struct process_info
*proc
, *tmp
;
1609 ALL_PROCESSES (proc
, tmp
)
1611 pid_t leader_pid
= pid_of (proc
);
1612 struct lwp_info
*leader_lp
;
1614 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1617 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1618 "num_lwps=%d, zombie=%d\n",
1619 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1620 linux_proc_pid_is_zombie (leader_pid
));
1622 if (leader_lp
!= NULL
1623 /* Check if there are other threads in the group, as we may
1624 have raced with the inferior simply exiting. */
1625 && !last_thread_of_process_p (leader_pid
)
1626 && linux_proc_pid_is_zombie (leader_pid
))
1628 /* A leader zombie can mean one of two things:
1630 - It exited, and there's an exit status pending
1631 available, or only the leader exited (not the whole
1632 program). In the latter case, we can't waitpid the
1633 leader's exit status until all other threads are gone.
1635 - There are 3 or more threads in the group, and a thread
1636 other than the leader exec'd. On an exec, the Linux
1637 kernel destroys all other threads (except the execing
1638 one) in the thread group, and resets the execing thread's
1639 tid to the tgid. No exit notification is sent for the
1640 execing thread -- from the ptracer's perspective, it
1641 appears as though the execing thread just vanishes.
1642 Until we reap all other threads except the leader and the
1643 execing thread, the leader will be zombie, and the
1644 execing thread will be in `D (disc sleep)'. As soon as
1645 all other threads are reaped, the execing thread changes
1646 it's tid to the tgid, and the previous (zombie) leader
1647 vanishes, giving place to the "new" leader. We could try
1648 distinguishing the exit and exec cases, by waiting once
1649 more, and seeing if something comes out, but it doesn't
1650 sound useful. The previous leader _does_ go away, and
1651 we'll re-add the new one once we see the exec event
1652 (which is just the same as what would happen if the
1653 previous leader did exit voluntarily before some other
1658 "CZL: Thread group leader %d zombie "
1659 "(it exited, or another thread execd).\n",
1662 delete_lwp (leader_lp
);
1667 /* Callback for `find_inferior'. Returns the first LWP that is not
1668 stopped. ARG is a PTID filter. */
1671 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
1673 struct thread_info
*thr
= (struct thread_info
*) entry
;
1674 struct lwp_info
*lwp
;
1675 ptid_t filter
= *(ptid_t
*) arg
;
1677 if (!ptid_match (ptid_of (thr
), filter
))
1680 lwp
= get_thread_lwp (thr
);
1687 /* This function should only be called if the LWP got a SIGTRAP.
1689 Handle any tracepoint steps or hits. Return true if a tracepoint
1690 event was handled, 0 otherwise. */
1693 handle_tracepoints (struct lwp_info
*lwp
)
1695 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1696 int tpoint_related_event
= 0;
1698 gdb_assert (lwp
->suspended
== 0);
1700 /* If this tracepoint hit causes a tracing stop, we'll immediately
1701 uninsert tracepoints. To do this, we temporarily pause all
1702 threads, unpatch away, and then unpause threads. We need to make
1703 sure the unpausing doesn't resume LWP too. */
1706 /* And we need to be sure that any all-threads-stopping doesn't try
1707 to move threads out of the jump pads, as it could deadlock the
1708 inferior (LWP could be in the jump pad, maybe even holding the
1711 /* Do any necessary step collect actions. */
1712 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1714 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1716 /* See if we just hit a tracepoint and do its main collect
1718 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1722 gdb_assert (lwp
->suspended
== 0);
1723 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
1725 if (tpoint_related_event
)
1728 debug_printf ("got a tracepoint event\n");
1735 /* Convenience wrapper. Returns true if LWP is presently collecting a
1739 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
1740 struct fast_tpoint_collect_status
*status
)
1742 CORE_ADDR thread_area
;
1743 struct thread_info
*thread
= get_lwp_thread (lwp
);
1745 if (the_low_target
.get_thread_area
== NULL
)
1748 /* Get the thread area address. This is used to recognize which
1749 thread is which when tracing with the in-process agent library.
1750 We don't read anything from the address, and treat it as opaque;
1751 it's the address itself that we assume is unique per-thread. */
1752 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
1755 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1758 /* The reason we resume in the caller, is because we want to be able
1759 to pass lwp->status_pending as WSTAT, and we need to clear
1760 status_pending_p before resuming, otherwise, linux_resume_one_lwp
1761 refuses to resume. */
1764 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
1766 struct thread_info
*saved_thread
;
1768 saved_thread
= current_thread
;
1769 current_thread
= get_lwp_thread (lwp
);
1772 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
1773 && supports_fast_tracepoints ()
1774 && agent_loaded_p ())
1776 struct fast_tpoint_collect_status status
;
1780 debug_printf ("Checking whether LWP %ld needs to move out of the "
1782 lwpid_of (current_thread
));
1784 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
1787 || (WSTOPSIG (*wstat
) != SIGILL
1788 && WSTOPSIG (*wstat
) != SIGFPE
1789 && WSTOPSIG (*wstat
) != SIGSEGV
1790 && WSTOPSIG (*wstat
) != SIGBUS
))
1792 lwp
->collecting_fast_tracepoint
= r
;
1796 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
1798 /* Haven't executed the original instruction yet.
1799 Set breakpoint there, and wait till it's hit,
1800 then single-step until exiting the jump pad. */
1801 lwp
->exit_jump_pad_bkpt
1802 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
1806 debug_printf ("Checking whether LWP %ld needs to move out of "
1807 "the jump pad...it does\n",
1808 lwpid_of (current_thread
));
1809 current_thread
= saved_thread
;
1816 /* If we get a synchronous signal while collecting, *and*
1817 while executing the (relocated) original instruction,
1818 reset the PC to point at the tpoint address, before
1819 reporting to GDB. Otherwise, it's an IPA lib bug: just
1820 report the signal to GDB, and pray for the best. */
1822 lwp
->collecting_fast_tracepoint
= 0;
1825 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
1826 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
1829 struct regcache
*regcache
;
1831 /* The si_addr on a few signals references the address
1832 of the faulting instruction. Adjust that as
1834 if ((WSTOPSIG (*wstat
) == SIGILL
1835 || WSTOPSIG (*wstat
) == SIGFPE
1836 || WSTOPSIG (*wstat
) == SIGBUS
1837 || WSTOPSIG (*wstat
) == SIGSEGV
)
1838 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
1839 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
1840 /* Final check just to make sure we don't clobber
1841 the siginfo of non-kernel-sent signals. */
1842 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
1844 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
1845 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
1846 (PTRACE_TYPE_ARG3
) 0, &info
);
1849 regcache
= get_thread_regcache (current_thread
, 1);
1850 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
1851 lwp
->stop_pc
= status
.tpoint_addr
;
1853 /* Cancel any fast tracepoint lock this thread was
1855 force_unlock_trace_buffer ();
1858 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
1861 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
1862 "stopping all threads momentarily.\n");
1864 stop_all_lwps (1, lwp
);
1866 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
1867 lwp
->exit_jump_pad_bkpt
= NULL
;
1869 unstop_all_lwps (1, lwp
);
1871 gdb_assert (lwp
->suspended
>= 0);
1877 debug_printf ("Checking whether LWP %ld needs to move out of the "
1879 lwpid_of (current_thread
));
1881 current_thread
= saved_thread
;
1885 /* Enqueue one signal in the "signals to report later when out of the
1889 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1891 struct pending_signals
*p_sig
;
1892 struct thread_info
*thread
= get_lwp_thread (lwp
);
1895 debug_printf ("Deferring signal %d for LWP %ld.\n",
1896 WSTOPSIG (*wstat
), lwpid_of (thread
));
1900 struct pending_signals
*sig
;
1902 for (sig
= lwp
->pending_signals_to_report
;
1905 debug_printf (" Already queued %d\n",
1908 debug_printf (" (no more currently queued signals)\n");
1911 /* Don't enqueue non-RT signals if they are already in the deferred
1912 queue. (SIGSTOP being the easiest signal to see ending up here
1914 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
1916 struct pending_signals
*sig
;
1918 for (sig
= lwp
->pending_signals_to_report
;
1922 if (sig
->signal
== WSTOPSIG (*wstat
))
1925 debug_printf ("Not requeuing already queued non-RT signal %d"
1934 p_sig
= xmalloc (sizeof (*p_sig
));
1935 p_sig
->prev
= lwp
->pending_signals_to_report
;
1936 p_sig
->signal
= WSTOPSIG (*wstat
);
1937 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
1938 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1941 lwp
->pending_signals_to_report
= p_sig
;
1944 /* Dequeue one signal from the "signals to report later when out of
1945 the jump pad" list. */
1948 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1950 struct thread_info
*thread
= get_lwp_thread (lwp
);
1952 if (lwp
->pending_signals_to_report
!= NULL
)
1954 struct pending_signals
**p_sig
;
1956 p_sig
= &lwp
->pending_signals_to_report
;
1957 while ((*p_sig
)->prev
!= NULL
)
1958 p_sig
= &(*p_sig
)->prev
;
1960 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
1961 if ((*p_sig
)->info
.si_signo
!= 0)
1962 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1968 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
1969 WSTOPSIG (*wstat
), lwpid_of (thread
));
1973 struct pending_signals
*sig
;
1975 for (sig
= lwp
->pending_signals_to_report
;
1978 debug_printf (" Still queued %d\n",
1981 debug_printf (" (no more queued signals)\n");
1990 /* Fetch the possibly triggered data watchpoint info and store it in
1993 On some archs, like x86, that use debug registers to set
1994 watchpoints, it's possible that the way to know which watched
1995 address trapped, is to check the register that is used to select
1996 which address to watch. Problem is, between setting the watchpoint
1997 and reading back which data address trapped, the user may change
1998 the set of watchpoints, and, as a consequence, GDB changes the
1999 debug registers in the inferior. To avoid reading back a stale
2000 stopped-data-address when that happens, we cache in LP the fact
2001 that a watchpoint trapped, and the corresponding data address, as
2002 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2003 registers meanwhile, we have the cached data we can rely on. */
2006 check_stopped_by_watchpoint (struct lwp_info
*child
)
2008 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2010 struct thread_info
*saved_thread
;
2012 saved_thread
= current_thread
;
2013 current_thread
= get_lwp_thread (child
);
2015 if (the_low_target
.stopped_by_watchpoint ())
2017 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2019 if (the_low_target
.stopped_data_address
!= NULL
)
2020 child
->stopped_data_address
2021 = the_low_target
.stopped_data_address ();
2023 child
->stopped_data_address
= 0;
2026 current_thread
= saved_thread
;
2029 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2032 /* Return the ptrace options that we want to try to enable. */
2035 linux_low_ptrace_options (int attached
)
2040 options
|= PTRACE_O_EXITKILL
;
2042 if (report_fork_events
)
2043 options
|= PTRACE_O_TRACEFORK
;
2045 if (report_vfork_events
)
2046 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2051 /* Do low-level handling of the event, and check if we should go on
2052 and pass it to caller code. Return the affected lwp if we are, or
2055 static struct lwp_info
*
2056 linux_low_filter_event (int lwpid
, int wstat
)
2058 struct lwp_info
*child
;
2059 struct thread_info
*thread
;
2060 int have_stop_pc
= 0;
2062 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2064 /* If we didn't find a process, one of two things presumably happened:
2065 - A process we started and then detached from has exited. Ignore it.
2066 - A process we are controlling has forked and the new child's stop
2067 was reported to us by the kernel. Save its PID. */
2068 if (child
== NULL
&& WIFSTOPPED (wstat
))
2070 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2073 else if (child
== NULL
)
2076 thread
= get_lwp_thread (child
);
2080 child
->last_status
= wstat
;
2082 /* Check if the thread has exited. */
2083 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2086 debug_printf ("LLFE: %d exited.\n", lwpid
);
2087 if (num_lwps (pid_of (thread
)) > 1)
2090 /* If there is at least one more LWP, then the exit signal was
2091 not the end of the debugged application and should be
2098 /* This was the last lwp in the process. Since events are
2099 serialized to GDB core, and we can't report this one
2100 right now, but GDB core and the other target layers will
2101 want to be notified about the exit code/signal, leave the
2102 status pending for the next time we're able to report
2104 mark_lwp_dead (child
, wstat
);
2109 gdb_assert (WIFSTOPPED (wstat
));
2111 if (WIFSTOPPED (wstat
))
2113 struct process_info
*proc
;
2115 /* Architecture-specific setup after inferior is running. */
2116 proc
= find_process_pid (pid_of (thread
));
2117 if (proc
->tdesc
== NULL
)
2121 struct thread_info
*saved_thread
;
2123 /* This needs to happen after we have attached to the
2124 inferior and it is stopped for the first time, but
2125 before we access any inferior registers. */
2126 saved_thread
= current_thread
;
2127 current_thread
= thread
;
2129 the_low_target
.arch_setup ();
2131 current_thread
= saved_thread
;
2135 /* The process is started, but GDBserver will do
2136 architecture-specific setup after the program stops at
2137 the first instruction. */
2138 child
->status_pending_p
= 1;
2139 child
->status_pending
= wstat
;
2145 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2147 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2148 int options
= linux_low_ptrace_options (proc
->attached
);
2150 linux_enable_event_reporting (lwpid
, options
);
2151 child
->must_set_ptrace_flags
= 0;
2154 /* Be careful to not overwrite stop_pc until
2155 check_stopped_by_breakpoint is called. */
2156 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2157 && linux_is_extended_waitstatus (wstat
))
2159 child
->stop_pc
= get_pc (child
);
2160 if (handle_extended_wait (child
, wstat
))
2162 /* The event has been handled, so just return without
2168 /* Check first whether this was a SW/HW breakpoint before checking
2169 watchpoints, because at least s390 can't tell the data address of
2170 hardware watchpoint hits, and returns stopped-by-watchpoint as
2171 long as there's a watchpoint set. */
2172 if (WIFSTOPPED (wstat
) && linux_wstatus_maybe_breakpoint (wstat
))
2174 if (check_stopped_by_breakpoint (child
))
2178 /* Note that TRAP_HWBKPT can indicate either a hardware breakpoint
2179 or hardware watchpoint. Check which is which if we got
2180 TARGET_STOPPED_BY_HW_BREAKPOINT. */
2181 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2182 && (child
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
2183 || child
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
2184 check_stopped_by_watchpoint (child
);
2187 child
->stop_pc
= get_pc (child
);
2189 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2190 && child
->stop_expected
)
2193 debug_printf ("Expected stop.\n");
2194 child
->stop_expected
= 0;
2196 if (thread
->last_resume_kind
== resume_stop
)
2198 /* We want to report the stop to the core. Treat the
2199 SIGSTOP as a normal event. */
2201 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2202 target_pid_to_str (ptid_of (thread
)));
2204 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2206 /* Stopping threads. We don't want this SIGSTOP to end up
2209 debug_printf ("LLW: SIGSTOP caught for %s "
2210 "while stopping threads.\n",
2211 target_pid_to_str (ptid_of (thread
)));
2216 /* This is a delayed SIGSTOP. Filter out the event. */
2218 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2219 child
->stepping
? "step" : "continue",
2220 target_pid_to_str (ptid_of (thread
)));
2222 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2227 child
->status_pending_p
= 1;
2228 child
->status_pending
= wstat
;
2232 /* Resume LWPs that are currently stopped without any pending status
2233 to report, but are resumed from the core's perspective. */
2236 resume_stopped_resumed_lwps (struct inferior_list_entry
*entry
)
2238 struct thread_info
*thread
= (struct thread_info
*) entry
;
2239 struct lwp_info
*lp
= get_thread_lwp (thread
);
2242 && !lp
->status_pending_p
2243 && thread
->last_resume_kind
!= resume_stop
2244 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2246 int step
= thread
->last_resume_kind
== resume_step
;
2249 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2250 target_pid_to_str (ptid_of (thread
)),
2251 paddress (lp
->stop_pc
),
2254 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2258 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2259 match FILTER_PTID (leaving others pending). The PTIDs can be:
2260 minus_one_ptid, to specify any child; a pid PTID, specifying all
2261 lwps of a thread group; or a PTID representing a single lwp. Store
2262 the stop status through the status pointer WSTAT. OPTIONS is
2263 passed to the waitpid call. Return 0 if no event was found and
2264 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2265 was found. Return the PID of the stopped child otherwise. */
2268 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2269 int *wstatp
, int options
)
2271 struct thread_info
*event_thread
;
2272 struct lwp_info
*event_child
, *requested_child
;
2273 sigset_t block_mask
, prev_mask
;
2276 /* N.B. event_thread points to the thread_info struct that contains
2277 event_child. Keep them in sync. */
2278 event_thread
= NULL
;
2280 requested_child
= NULL
;
2282 /* Check for a lwp with a pending status. */
2284 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2286 event_thread
= (struct thread_info
*)
2287 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2288 if (event_thread
!= NULL
)
2289 event_child
= get_thread_lwp (event_thread
);
2290 if (debug_threads
&& event_thread
)
2291 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2293 else if (!ptid_equal (filter_ptid
, null_ptid
))
2295 requested_child
= find_lwp_pid (filter_ptid
);
2297 if (stopping_threads
== NOT_STOPPING_THREADS
2298 && requested_child
->status_pending_p
2299 && requested_child
->collecting_fast_tracepoint
)
2301 enqueue_one_deferred_signal (requested_child
,
2302 &requested_child
->status_pending
);
2303 requested_child
->status_pending_p
= 0;
2304 requested_child
->status_pending
= 0;
2305 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2308 if (requested_child
->suspended
2309 && requested_child
->status_pending_p
)
2311 internal_error (__FILE__
, __LINE__
,
2312 "requesting an event out of a"
2313 " suspended child?");
2316 if (requested_child
->status_pending_p
)
2318 event_child
= requested_child
;
2319 event_thread
= get_lwp_thread (event_child
);
2323 if (event_child
!= NULL
)
2326 debug_printf ("Got an event from pending child %ld (%04x)\n",
2327 lwpid_of (event_thread
), event_child
->status_pending
);
2328 *wstatp
= event_child
->status_pending
;
2329 event_child
->status_pending_p
= 0;
2330 event_child
->status_pending
= 0;
2331 current_thread
= event_thread
;
2332 return lwpid_of (event_thread
);
2335 /* But if we don't find a pending event, we'll have to wait.
2337 We only enter this loop if no process has a pending wait status.
2338 Thus any action taken in response to a wait status inside this
2339 loop is responding as soon as we detect the status, not after any
2342 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2343 all signals while here. */
2344 sigfillset (&block_mask
);
2345 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2347 /* Always pull all events out of the kernel. We'll randomly select
2348 an event LWP out of all that have events, to prevent
2350 while (event_child
== NULL
)
2354 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2357 - If the thread group leader exits while other threads in the
2358 thread group still exist, waitpid(TGID, ...) hangs. That
2359 waitpid won't return an exit status until the other threads
2360 in the group are reaped.
2362 - When a non-leader thread execs, that thread just vanishes
2363 without reporting an exit (so we'd hang if we waited for it
2364 explicitly in that case). The exec event is reported to
2365 the TGID pid (although we don't currently enable exec
2368 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2371 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2372 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2378 debug_printf ("LLW: waitpid %ld received %s\n",
2379 (long) ret
, status_to_str (*wstatp
));
2382 /* Filter all events. IOW, leave all events pending. We'll
2383 randomly select an event LWP out of all that have events
2385 linux_low_filter_event (ret
, *wstatp
);
2386 /* Retry until nothing comes out of waitpid. A single
2387 SIGCHLD can indicate more than one child stopped. */
2391 /* Now that we've pulled all events out of the kernel, resume
2392 LWPs that don't have an interesting event to report. */
2393 if (stopping_threads
== NOT_STOPPING_THREADS
)
2394 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2396 /* ... and find an LWP with a status to report to the core, if
2398 event_thread
= (struct thread_info
*)
2399 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2400 if (event_thread
!= NULL
)
2402 event_child
= get_thread_lwp (event_thread
);
2403 *wstatp
= event_child
->status_pending
;
2404 event_child
->status_pending_p
= 0;
2405 event_child
->status_pending
= 0;
2409 /* Check for zombie thread group leaders. Those can't be reaped
2410 until all other threads in the thread group are. */
2411 check_zombie_leaders ();
2413 /* If there are no resumed children left in the set of LWPs we
2414 want to wait for, bail. We can't just block in
2415 waitpid/sigsuspend, because lwps might have been left stopped
2416 in trace-stop state, and we'd be stuck forever waiting for
2417 their status to change (which would only happen if we resumed
2418 them). Even if WNOHANG is set, this return code is preferred
2419 over 0 (below), as it is more detailed. */
2420 if ((find_inferior (&all_threads
,
2421 not_stopped_callback
,
2422 &wait_ptid
) == NULL
))
2425 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2426 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2430 /* No interesting event to report to the caller. */
2431 if ((options
& WNOHANG
))
2434 debug_printf ("WNOHANG set, no event found\n");
2436 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2440 /* Block until we get an event reported with SIGCHLD. */
2442 debug_printf ("sigsuspend'ing\n");
2444 sigsuspend (&prev_mask
);
2445 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2449 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2451 current_thread
= event_thread
;
2453 /* Check for thread exit. */
2454 if (! WIFSTOPPED (*wstatp
))
2456 gdb_assert (last_thread_of_process_p (pid_of (event_thread
)));
2459 debug_printf ("LWP %d is the last lwp of process. "
2460 "Process %ld exiting.\n",
2461 pid_of (event_thread
), lwpid_of (event_thread
));
2462 return lwpid_of (event_thread
);
2465 return lwpid_of (event_thread
);
2468 /* Wait for an event from child(ren) PTID. PTIDs can be:
2469 minus_one_ptid, to specify any child; a pid PTID, specifying all
2470 lwps of a thread group; or a PTID representing a single lwp. Store
2471 the stop status through the status pointer WSTAT. OPTIONS is
2472 passed to the waitpid call. Return 0 if no event was found and
2473 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2474 was found. Return the PID of the stopped child otherwise. */
2477 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2479 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2482 /* Count the LWP's that have had events. */
2485 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2487 struct thread_info
*thread
= (struct thread_info
*) entry
;
2488 struct lwp_info
*lp
= get_thread_lwp (thread
);
2491 gdb_assert (count
!= NULL
);
2493 /* Count only resumed LWPs that have an event pending. */
2494 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2495 && lp
->status_pending_p
)
2501 /* Select the LWP (if any) that is currently being single-stepped. */
2504 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2506 struct thread_info
*thread
= (struct thread_info
*) entry
;
2507 struct lwp_info
*lp
= get_thread_lwp (thread
);
2509 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2510 && thread
->last_resume_kind
== resume_step
2511 && lp
->status_pending_p
)
2517 /* Select the Nth LWP that has had an event. */
2520 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2522 struct thread_info
*thread
= (struct thread_info
*) entry
;
2523 struct lwp_info
*lp
= get_thread_lwp (thread
);
2524 int *selector
= data
;
2526 gdb_assert (selector
!= NULL
);
2528 /* Select only resumed LWPs that have an event pending. */
2529 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2530 && lp
->status_pending_p
)
2531 if ((*selector
)-- == 0)
2537 /* Select one LWP out of those that have events pending. */
2540 select_event_lwp (struct lwp_info
**orig_lp
)
2543 int random_selector
;
2544 struct thread_info
*event_thread
= NULL
;
2546 /* In all-stop, give preference to the LWP that is being
2547 single-stepped. There will be at most one, and it's the LWP that
2548 the core is most interested in. If we didn't do this, then we'd
2549 have to handle pending step SIGTRAPs somehow in case the core
2550 later continues the previously-stepped thread, otherwise we'd
2551 report the pending SIGTRAP, and the core, not having stepped the
2552 thread, wouldn't understand what the trap was for, and therefore
2553 would report it to the user as a random signal. */
2557 = (struct thread_info
*) find_inferior (&all_threads
,
2558 select_singlestep_lwp_callback
,
2560 if (event_thread
!= NULL
)
2563 debug_printf ("SEL: Select single-step %s\n",
2564 target_pid_to_str (ptid_of (event_thread
)));
2567 if (event_thread
== NULL
)
2569 /* No single-stepping LWP. Select one at random, out of those
2570 which have had events. */
2572 /* First see how many events we have. */
2573 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2574 gdb_assert (num_events
> 0);
2576 /* Now randomly pick a LWP out of those that have had
2578 random_selector
= (int)
2579 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2581 if (debug_threads
&& num_events
> 1)
2582 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2583 num_events
, random_selector
);
2586 = (struct thread_info
*) find_inferior (&all_threads
,
2587 select_event_lwp_callback
,
2591 if (event_thread
!= NULL
)
2593 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2595 /* Switch the event LWP. */
2596 *orig_lp
= event_lp
;
2600 /* Decrement the suspend count of an LWP. */
2603 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2605 struct thread_info
*thread
= (struct thread_info
*) entry
;
2606 struct lwp_info
*lwp
= get_thread_lwp (thread
);
2608 /* Ignore EXCEPT. */
2614 gdb_assert (lwp
->suspended
>= 0);
2618 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2622 unsuspend_all_lwps (struct lwp_info
*except
)
2624 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
2627 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
2628 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
2630 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
2631 static ptid_t
linux_wait_1 (ptid_t ptid
,
2632 struct target_waitstatus
*ourstatus
,
2633 int target_options
);
2635 /* Stabilize threads (move out of jump pads).
2637 If a thread is midway collecting a fast tracepoint, we need to
2638 finish the collection and move it out of the jump pad before
2639 reporting the signal.
2641 This avoids recursion while collecting (when a signal arrives
2642 midway, and the signal handler itself collects), which would trash
2643 the trace buffer. In case the user set a breakpoint in a signal
2644 handler, this avoids the backtrace showing the jump pad, etc..
2645 Most importantly, there are certain things we can't do safely if
2646 threads are stopped in a jump pad (or in its callee's). For
2649 - starting a new trace run. A thread still collecting the
2650 previous run, could trash the trace buffer when resumed. The trace
2651 buffer control structures would have been reset but the thread had
2652 no way to tell. The thread could even midway memcpy'ing to the
2653 buffer, which would mean that when resumed, it would clobber the
2654 trace buffer that had been set for a new run.
2656 - we can't rewrite/reuse the jump pads for new tracepoints
2657 safely. Say you do tstart while a thread is stopped midway while
2658 collecting. When the thread is later resumed, it finishes the
2659 collection, and returns to the jump pad, to execute the original
2660 instruction that was under the tracepoint jump at the time the
2661 older run had been started. If the jump pad had been rewritten
2662 since for something else in the new run, the thread would now
2663 execute the wrong / random instructions. */
2666 linux_stabilize_threads (void)
2668 struct thread_info
*saved_thread
;
2669 struct thread_info
*thread_stuck
;
2672 = (struct thread_info
*) find_inferior (&all_threads
,
2673 stuck_in_jump_pad_callback
,
2675 if (thread_stuck
!= NULL
)
2678 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2679 lwpid_of (thread_stuck
));
2683 saved_thread
= current_thread
;
2685 stabilizing_threads
= 1;
2688 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
2690 /* Loop until all are stopped out of the jump pads. */
2691 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
2693 struct target_waitstatus ourstatus
;
2694 struct lwp_info
*lwp
;
2697 /* Note that we go through the full wait even loop. While
2698 moving threads out of jump pad, we need to be able to step
2699 over internal breakpoints and such. */
2700 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2702 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2704 lwp
= get_thread_lwp (current_thread
);
2709 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
2710 || current_thread
->last_resume_kind
== resume_stop
)
2712 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
2713 enqueue_one_deferred_signal (lwp
, &wstat
);
2718 find_inferior (&all_threads
, unsuspend_one_lwp
, NULL
);
2720 stabilizing_threads
= 0;
2722 current_thread
= saved_thread
;
2727 = (struct thread_info
*) find_inferior (&all_threads
,
2728 stuck_in_jump_pad_callback
,
2730 if (thread_stuck
!= NULL
)
2731 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
2732 lwpid_of (thread_stuck
));
2736 static void async_file_mark (void);
2738 /* Convenience function that is called when the kernel reports an
2739 event that is not passed out to GDB. */
2742 ignore_event (struct target_waitstatus
*ourstatus
)
2744 /* If we got an event, there may still be others, as a single
2745 SIGCHLD can indicate more than one child stopped. This forces
2746 another target_wait call. */
2749 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2753 /* Return non-zero if WAITSTATUS reflects an extended linux
2754 event. Otherwise, return zero. */
2757 extended_event_reported (const struct target_waitstatus
*waitstatus
)
2759 if (waitstatus
== NULL
)
2762 return (waitstatus
->kind
== TARGET_WAITKIND_FORKED
2763 || waitstatus
->kind
== TARGET_WAITKIND_VFORKED
2764 || waitstatus
->kind
== TARGET_WAITKIND_VFORK_DONE
);
2767 /* Wait for process, returns status. */
2770 linux_wait_1 (ptid_t ptid
,
2771 struct target_waitstatus
*ourstatus
, int target_options
)
2774 struct lwp_info
*event_child
;
2777 int step_over_finished
;
2778 int bp_explains_trap
;
2779 int maybe_internal_trap
;
2787 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
2790 /* Translate generic target options into linux options. */
2792 if (target_options
& TARGET_WNOHANG
)
2795 bp_explains_trap
= 0;
2798 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2800 if (ptid_equal (step_over_bkpt
, null_ptid
))
2801 pid
= linux_wait_for_event (ptid
, &w
, options
);
2805 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
2806 target_pid_to_str (step_over_bkpt
));
2807 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
2812 gdb_assert (target_options
& TARGET_WNOHANG
);
2816 debug_printf ("linux_wait_1 ret = null_ptid, "
2817 "TARGET_WAITKIND_IGNORE\n");
2821 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2828 debug_printf ("linux_wait_1 ret = null_ptid, "
2829 "TARGET_WAITKIND_NO_RESUMED\n");
2833 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
2837 event_child
= get_thread_lwp (current_thread
);
2839 /* linux_wait_for_event only returns an exit status for the last
2840 child of a process. Report it. */
2841 if (WIFEXITED (w
) || WIFSIGNALED (w
))
2845 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
2846 ourstatus
->value
.integer
= WEXITSTATUS (w
);
2850 debug_printf ("linux_wait_1 ret = %s, exited with "
2852 target_pid_to_str (ptid_of (current_thread
)),
2859 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
2860 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
2864 debug_printf ("linux_wait_1 ret = %s, terminated with "
2866 target_pid_to_str (ptid_of (current_thread
)),
2872 return ptid_of (current_thread
);
2875 /* If step-over executes a breakpoint instruction, it means a
2876 gdb/gdbserver breakpoint had been planted on top of a permanent
2877 breakpoint. The PC has been adjusted by
2878 check_stopped_by_breakpoint to point at the breakpoint address.
2879 Advance the PC manually past the breakpoint, otherwise the
2880 program would keep trapping the permanent breakpoint forever. */
2881 if (!ptid_equal (step_over_bkpt
, null_ptid
)
2882 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
2884 unsigned int increment_pc
= the_low_target
.breakpoint_len
;
2888 debug_printf ("step-over for %s executed software breakpoint\n",
2889 target_pid_to_str (ptid_of (current_thread
)));
2892 if (increment_pc
!= 0)
2894 struct regcache
*regcache
2895 = get_thread_regcache (current_thread
, 1);
2897 event_child
->stop_pc
+= increment_pc
;
2898 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
2900 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
2901 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
2905 /* If this event was not handled before, and is not a SIGTRAP, we
2906 report it. SIGILL and SIGSEGV are also treated as traps in case
2907 a breakpoint is inserted at the current PC. If this target does
2908 not support internal breakpoints at all, we also report the
2909 SIGTRAP without further processing; it's of no concern to us. */
2911 = (supports_breakpoints ()
2912 && (WSTOPSIG (w
) == SIGTRAP
2913 || ((WSTOPSIG (w
) == SIGILL
2914 || WSTOPSIG (w
) == SIGSEGV
)
2915 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
2917 if (maybe_internal_trap
)
2919 /* Handle anything that requires bookkeeping before deciding to
2920 report the event or continue waiting. */
2922 /* First check if we can explain the SIGTRAP with an internal
2923 breakpoint, or if we should possibly report the event to GDB.
2924 Do this before anything that may remove or insert a
2926 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
2928 /* We have a SIGTRAP, possibly a step-over dance has just
2929 finished. If so, tweak the state machine accordingly,
2930 reinsert breakpoints and delete any reinsert (software
2931 single-step) breakpoints. */
2932 step_over_finished
= finish_step_over (event_child
);
2934 /* Now invoke the callbacks of any internal breakpoints there. */
2935 check_breakpoints (event_child
->stop_pc
);
2937 /* Handle tracepoint data collecting. This may overflow the
2938 trace buffer, and cause a tracing stop, removing
2940 trace_event
= handle_tracepoints (event_child
);
2942 if (bp_explains_trap
)
2944 /* If we stepped or ran into an internal breakpoint, we've
2945 already handled it. So next time we resume (from this
2946 PC), we should step over it. */
2948 debug_printf ("Hit a gdbserver breakpoint.\n");
2950 if (breakpoint_here (event_child
->stop_pc
))
2951 event_child
->need_step_over
= 1;
2956 /* We have some other signal, possibly a step-over dance was in
2957 progress, and it should be cancelled too. */
2958 step_over_finished
= finish_step_over (event_child
);
2961 /* We have all the data we need. Either report the event to GDB, or
2962 resume threads and keep waiting for more. */
2964 /* If we're collecting a fast tracepoint, finish the collection and
2965 move out of the jump pad before delivering a signal. See
2966 linux_stabilize_threads. */
2969 && WSTOPSIG (w
) != SIGTRAP
2970 && supports_fast_tracepoints ()
2971 && agent_loaded_p ())
2974 debug_printf ("Got signal %d for LWP %ld. Check if we need "
2975 "to defer or adjust it.\n",
2976 WSTOPSIG (w
), lwpid_of (current_thread
));
2978 /* Allow debugging the jump pad itself. */
2979 if (current_thread
->last_resume_kind
!= resume_step
2980 && maybe_move_out_of_jump_pad (event_child
, &w
))
2982 enqueue_one_deferred_signal (event_child
, &w
);
2985 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
2986 WSTOPSIG (w
), lwpid_of (current_thread
));
2988 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
2990 return ignore_event (ourstatus
);
2994 if (event_child
->collecting_fast_tracepoint
)
2997 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
2998 "Check if we're already there.\n",
2999 lwpid_of (current_thread
),
3000 event_child
->collecting_fast_tracepoint
);
3004 event_child
->collecting_fast_tracepoint
3005 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3007 if (event_child
->collecting_fast_tracepoint
!= 1)
3009 /* No longer need this breakpoint. */
3010 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3013 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3014 "stopping all threads momentarily.\n");
3016 /* Other running threads could hit this breakpoint.
3017 We don't handle moribund locations like GDB does,
3018 instead we always pause all threads when removing
3019 breakpoints, so that any step-over or
3020 decr_pc_after_break adjustment is always taken
3021 care of while the breakpoint is still
3023 stop_all_lwps (1, event_child
);
3025 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3026 event_child
->exit_jump_pad_bkpt
= NULL
;
3028 unstop_all_lwps (1, event_child
);
3030 gdb_assert (event_child
->suspended
>= 0);
3034 if (event_child
->collecting_fast_tracepoint
== 0)
3037 debug_printf ("fast tracepoint finished "
3038 "collecting successfully.\n");
3040 /* We may have a deferred signal to report. */
3041 if (dequeue_one_deferred_signal (event_child
, &w
))
3044 debug_printf ("dequeued one signal.\n");
3049 debug_printf ("no deferred signals.\n");
3051 if (stabilizing_threads
)
3053 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3054 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3058 debug_printf ("linux_wait_1 ret = %s, stopped "
3059 "while stabilizing threads\n",
3060 target_pid_to_str (ptid_of (current_thread
)));
3064 return ptid_of (current_thread
);
3070 /* Check whether GDB would be interested in this event. */
3072 /* If GDB is not interested in this signal, don't stop other
3073 threads, and don't report it to GDB. Just resume the inferior
3074 right away. We do this for threading-related signals as well as
3075 any that GDB specifically requested we ignore. But never ignore
3076 SIGSTOP if we sent it ourselves, and do not ignore signals when
3077 stepping - they may require special handling to skip the signal
3078 handler. Also never ignore signals that could be caused by a
3080 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
3083 && current_thread
->last_resume_kind
!= resume_step
3085 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3086 (current_process ()->priv
->thread_db
!= NULL
3087 && (WSTOPSIG (w
) == __SIGRTMIN
3088 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3091 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3092 && !(WSTOPSIG (w
) == SIGSTOP
3093 && current_thread
->last_resume_kind
== resume_stop
)
3094 && !linux_wstatus_maybe_breakpoint (w
))))
3096 siginfo_t info
, *info_p
;
3099 debug_printf ("Ignored signal %d for LWP %ld.\n",
3100 WSTOPSIG (w
), lwpid_of (current_thread
));
3102 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3103 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3107 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3108 WSTOPSIG (w
), info_p
);
3109 return ignore_event (ourstatus
);
3112 /* Note that all addresses are always "out of the step range" when
3113 there's no range to begin with. */
3114 in_step_range
= lwp_in_step_range (event_child
);
3116 /* If GDB wanted this thread to single step, and the thread is out
3117 of the step range, we always want to report the SIGTRAP, and let
3118 GDB handle it. Watchpoints should always be reported. So should
3119 signals we can't explain. A SIGTRAP we can't explain could be a
3120 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3121 do, we're be able to handle GDB breakpoints on top of internal
3122 breakpoints, by handling the internal breakpoint and still
3123 reporting the event to GDB. If we don't, we're out of luck, GDB
3124 won't see the breakpoint hit. */
3125 report_to_gdb
= (!maybe_internal_trap
3126 || (current_thread
->last_resume_kind
== resume_step
3128 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3129 || (!step_over_finished
&& !in_step_range
3130 && !bp_explains_trap
&& !trace_event
)
3131 || (gdb_breakpoint_here (event_child
->stop_pc
)
3132 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3133 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3134 || extended_event_reported (&event_child
->waitstatus
));
3136 run_breakpoint_commands (event_child
->stop_pc
);
3138 /* We found no reason GDB would want us to stop. We either hit one
3139 of our own breakpoints, or finished an internal step GDB
3140 shouldn't know about. */
3145 if (bp_explains_trap
)
3146 debug_printf ("Hit a gdbserver breakpoint.\n");
3147 if (step_over_finished
)
3148 debug_printf ("Step-over finished.\n");
3150 debug_printf ("Tracepoint event.\n");
3151 if (lwp_in_step_range (event_child
))
3152 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3153 paddress (event_child
->stop_pc
),
3154 paddress (event_child
->step_range_start
),
3155 paddress (event_child
->step_range_end
));
3158 /* We're not reporting this breakpoint to GDB, so apply the
3159 decr_pc_after_break adjustment to the inferior's regcache
3162 if (the_low_target
.set_pc
!= NULL
)
3164 struct regcache
*regcache
3165 = get_thread_regcache (current_thread
, 1);
3166 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3169 /* We may have finished stepping over a breakpoint. If so,
3170 we've stopped and suspended all LWPs momentarily except the
3171 stepping one. This is where we resume them all again. We're
3172 going to keep waiting, so use proceed, which handles stepping
3173 over the next breakpoint. */
3175 debug_printf ("proceeding all threads.\n");
3177 if (step_over_finished
)
3178 unsuspend_all_lwps (event_child
);
3180 proceed_all_lwps ();
3181 return ignore_event (ourstatus
);
3186 if (extended_event_reported (&event_child
->waitstatus
))
3190 str
= target_waitstatus_to_string (&event_child
->waitstatus
);
3191 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3192 lwpid_of (get_lwp_thread (event_child
)), str
);
3195 if (current_thread
->last_resume_kind
== resume_step
)
3197 if (event_child
->step_range_start
== event_child
->step_range_end
)
3198 debug_printf ("GDB wanted to single-step, reporting event.\n");
3199 else if (!lwp_in_step_range (event_child
))
3200 debug_printf ("Out of step range, reporting event.\n");
3202 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3203 debug_printf ("Stopped by watchpoint.\n");
3204 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3205 debug_printf ("Stopped by GDB breakpoint.\n");
3207 debug_printf ("Hit a non-gdbserver trap event.\n");
3210 /* Alright, we're going to report a stop. */
3212 if (!stabilizing_threads
)
3214 /* In all-stop, stop all threads. */
3216 stop_all_lwps (0, NULL
);
3218 /* If we're not waiting for a specific LWP, choose an event LWP
3219 from among those that have had events. Giving equal priority
3220 to all LWPs that have had events helps prevent
3222 if (ptid_equal (ptid
, minus_one_ptid
))
3224 event_child
->status_pending_p
= 1;
3225 event_child
->status_pending
= w
;
3227 select_event_lwp (&event_child
);
3229 /* current_thread and event_child must stay in sync. */
3230 current_thread
= get_lwp_thread (event_child
);
3232 event_child
->status_pending_p
= 0;
3233 w
= event_child
->status_pending
;
3236 if (step_over_finished
)
3240 /* If we were doing a step-over, all other threads but
3241 the stepping one had been paused in start_step_over,
3242 with their suspend counts incremented. We don't want
3243 to do a full unstop/unpause, because we're in
3244 all-stop mode (so we want threads stopped), but we
3245 still need to unsuspend the other threads, to
3246 decrement their `suspended' count back. */
3247 unsuspend_all_lwps (event_child
);
3251 /* If we just finished a step-over, then all threads had
3252 been momentarily paused. In all-stop, that's fine,
3253 we want threads stopped by now anyway. In non-stop,
3254 we need to re-resume threads that GDB wanted to be
3256 unstop_all_lwps (1, event_child
);
3260 /* Stabilize threads (move out of jump pads). */
3262 stabilize_threads ();
3266 /* If we just finished a step-over, then all threads had been
3267 momentarily paused. In all-stop, that's fine, we want
3268 threads stopped by now anyway. In non-stop, we need to
3269 re-resume threads that GDB wanted to be running. */
3270 if (step_over_finished
)
3271 unstop_all_lwps (1, event_child
);
3274 if (extended_event_reported (&event_child
->waitstatus
))
3276 /* If the reported event is a fork, vfork or exec, let GDB know. */
3277 ourstatus
->kind
= event_child
->waitstatus
.kind
;
3278 ourstatus
->value
= event_child
->waitstatus
.value
;
3280 /* Clear the event lwp's waitstatus since we handled it already. */
3281 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3284 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3286 /* Now that we've selected our final event LWP, un-adjust its PC if
3287 it was a software breakpoint, and the client doesn't know we can
3288 adjust the breakpoint ourselves. */
3289 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3290 && !swbreak_feature
)
3292 int decr_pc
= the_low_target
.decr_pc_after_break
;
3296 struct regcache
*regcache
3297 = get_thread_regcache (current_thread
, 1);
3298 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3302 if (current_thread
->last_resume_kind
== resume_stop
3303 && WSTOPSIG (w
) == SIGSTOP
)
3305 /* A thread that has been requested to stop by GDB with vCont;t,
3306 and it stopped cleanly, so report as SIG0. The use of
3307 SIGSTOP is an implementation detail. */
3308 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3310 else if (current_thread
->last_resume_kind
== resume_stop
3311 && WSTOPSIG (w
) != SIGSTOP
)
3313 /* A thread that has been requested to stop by GDB with vCont;t,
3314 but, it stopped for other reasons. */
3315 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3317 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3319 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3322 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3326 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3327 target_pid_to_str (ptid_of (current_thread
)),
3328 ourstatus
->kind
, ourstatus
->value
.sig
);
3332 return ptid_of (current_thread
);
3335 /* Get rid of any pending event in the pipe. */
3337 async_file_flush (void)
3343 ret
= read (linux_event_pipe
[0], &buf
, 1);
3344 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3347 /* Put something in the pipe, so the event loop wakes up. */
3349 async_file_mark (void)
3353 async_file_flush ();
3356 ret
= write (linux_event_pipe
[1], "+", 1);
3357 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3359 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3360 be awakened anyway. */
3364 linux_wait (ptid_t ptid
,
3365 struct target_waitstatus
*ourstatus
, int target_options
)
3369 /* Flush the async file first. */
3370 if (target_is_async_p ())
3371 async_file_flush ();
3375 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3377 while ((target_options
& TARGET_WNOHANG
) == 0
3378 && ptid_equal (event_ptid
, null_ptid
)
3379 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3381 /* If at least one stop was reported, there may be more. A single
3382 SIGCHLD can signal more than one child stop. */
3383 if (target_is_async_p ()
3384 && (target_options
& TARGET_WNOHANG
) != 0
3385 && !ptid_equal (event_ptid
, null_ptid
))
3391 /* Send a signal to an LWP. */
3394 kill_lwp (unsigned long lwpid
, int signo
)
3396 /* Use tkill, if possible, in case we are using nptl threads. If tkill
3397 fails, then we are not using nptl threads and we should be using kill. */
3401 static int tkill_failed
;
3408 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3409 if (errno
!= ENOSYS
)
3416 return kill (lwpid
, signo
);
3420 linux_stop_lwp (struct lwp_info
*lwp
)
3426 send_sigstop (struct lwp_info
*lwp
)
3430 pid
= lwpid_of (get_lwp_thread (lwp
));
3432 /* If we already have a pending stop signal for this process, don't
3434 if (lwp
->stop_expected
)
3437 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3443 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3445 lwp
->stop_expected
= 1;
3446 kill_lwp (pid
, SIGSTOP
);
3450 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
3452 struct thread_info
*thread
= (struct thread_info
*) entry
;
3453 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3455 /* Ignore EXCEPT. */
3466 /* Increment the suspend count of an LWP, and stop it, if not stopped
3469 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
3472 struct thread_info
*thread
= (struct thread_info
*) entry
;
3473 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3475 /* Ignore EXCEPT. */
3481 return send_sigstop_callback (entry
, except
);
3485 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3487 /* It's dead, really. */
3490 /* Store the exit status for later. */
3491 lwp
->status_pending_p
= 1;
3492 lwp
->status_pending
= wstat
;
3494 /* Prevent trying to stop it. */
3497 /* No further stops are expected from a dead lwp. */
3498 lwp
->stop_expected
= 0;
3501 /* Wait for all children to stop for the SIGSTOPs we just queued. */
3504 wait_for_sigstop (void)
3506 struct thread_info
*saved_thread
;
3511 saved_thread
= current_thread
;
3512 if (saved_thread
!= NULL
)
3513 saved_tid
= saved_thread
->entry
.id
;
3515 saved_tid
= null_ptid
; /* avoid bogus unused warning */
3518 debug_printf ("wait_for_sigstop: pulling events\n");
3520 /* Passing NULL_PTID as filter indicates we want all events to be
3521 left pending. Eventually this returns when there are no
3522 unwaited-for children left. */
3523 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
3525 gdb_assert (ret
== -1);
3527 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
3528 current_thread
= saved_thread
;
3532 debug_printf ("Previously current thread died.\n");
3536 /* We can't change the current inferior behind GDB's back,
3537 otherwise, a subsequent command may apply to the wrong
3539 current_thread
= NULL
;
3543 /* Set a valid thread as current. */
3544 set_desired_thread (0);
3549 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
3550 move it out, because we need to report the stop event to GDB. For
3551 example, if the user puts a breakpoint in the jump pad, it's
3552 because she wants to debug it. */
3555 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
3557 struct thread_info
*thread
= (struct thread_info
*) entry
;
3558 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3560 gdb_assert (lwp
->suspended
== 0);
3561 gdb_assert (lwp
->stopped
);
3563 /* Allow debugging the jump pad, gdb_collect, etc.. */
3564 return (supports_fast_tracepoints ()
3565 && agent_loaded_p ()
3566 && (gdb_breakpoint_here (lwp
->stop_pc
)
3567 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3568 || thread
->last_resume_kind
== resume_step
)
3569 && linux_fast_tracepoint_collecting (lwp
, NULL
));
3573 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
3575 struct thread_info
*thread
= (struct thread_info
*) entry
;
3576 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3579 gdb_assert (lwp
->suspended
== 0);
3580 gdb_assert (lwp
->stopped
);
3582 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
3584 /* Allow debugging the jump pad, gdb_collect, etc. */
3585 if (!gdb_breakpoint_here (lwp
->stop_pc
)
3586 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
3587 && thread
->last_resume_kind
!= resume_step
3588 && maybe_move_out_of_jump_pad (lwp
, wstat
))
3591 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
3596 lwp
->status_pending_p
= 0;
3597 enqueue_one_deferred_signal (lwp
, wstat
);
3600 debug_printf ("Signal %d for LWP %ld deferred "
3602 WSTOPSIG (*wstat
), lwpid_of (thread
));
3605 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
3612 lwp_running (struct inferior_list_entry
*entry
, void *data
)
3614 struct thread_info
*thread
= (struct thread_info
*) entry
;
3615 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3624 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
3625 If SUSPEND, then also increase the suspend count of every LWP,
3629 stop_all_lwps (int suspend
, struct lwp_info
*except
)
3631 /* Should not be called recursively. */
3632 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
3637 debug_printf ("stop_all_lwps (%s, except=%s)\n",
3638 suspend
? "stop-and-suspend" : "stop",
3640 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
3644 stopping_threads
= (suspend
3645 ? STOPPING_AND_SUSPENDING_THREADS
3646 : STOPPING_THREADS
);
3649 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
3651 find_inferior (&all_threads
, send_sigstop_callback
, except
);
3652 wait_for_sigstop ();
3653 stopping_threads
= NOT_STOPPING_THREADS
;
3657 debug_printf ("stop_all_lwps done, setting stopping_threads "
3658 "back to !stopping\n");
3663 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
3664 SIGNAL is nonzero, give it that signal. */
3667 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
3668 int step
, int signal
, siginfo_t
*info
)
3670 struct thread_info
*thread
= get_lwp_thread (lwp
);
3671 struct thread_info
*saved_thread
;
3672 int fast_tp_collecting
;
3673 struct process_info
*proc
= get_thread_process (thread
);
3675 /* Note that target description may not be initialised
3676 (proc->tdesc == NULL) at this point because the program hasn't
3677 stopped at the first instruction yet. It means GDBserver skips
3678 the extra traps from the wrapper program (see option --wrapper).
3679 Code in this function that requires register access should be
3680 guarded by proc->tdesc == NULL or something else. */
3682 if (lwp
->stopped
== 0)
3685 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
3687 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
3689 /* Cancel actions that rely on GDB not changing the PC (e.g., the
3690 user used the "jump" command, or "set $pc = foo"). */
3691 if (thread
->while_stepping
!= NULL
&& lwp
->stop_pc
!= get_pc (lwp
))
3693 /* Collecting 'while-stepping' actions doesn't make sense
3695 release_while_stepping_state_list (thread
);
3698 /* If we have pending signals or status, and a new signal, enqueue the
3699 signal. Also enqueue the signal if we are waiting to reinsert a
3700 breakpoint; it will be picked up again below. */
3702 && (lwp
->status_pending_p
3703 || lwp
->pending_signals
!= NULL
3704 || lwp
->bp_reinsert
!= 0
3705 || fast_tp_collecting
))
3707 struct pending_signals
*p_sig
;
3708 p_sig
= xmalloc (sizeof (*p_sig
));
3709 p_sig
->prev
= lwp
->pending_signals
;
3710 p_sig
->signal
= signal
;
3712 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3714 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3715 lwp
->pending_signals
= p_sig
;
3718 if (lwp
->status_pending_p
)
3721 debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);"
3722 " has pending status\n",
3723 lwpid_of (thread
), step
? "step" : "continue", signal
,
3724 lwp
->stop_expected
? "expected" : "not expected");
3728 saved_thread
= current_thread
;
3729 current_thread
= thread
;
3732 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
3733 lwpid_of (thread
), step
? "step" : "continue", signal
,
3734 lwp
->stop_expected
? "expected" : "not expected");
3736 /* This bit needs some thinking about. If we get a signal that
3737 we must report while a single-step reinsert is still pending,
3738 we often end up resuming the thread. It might be better to
3739 (ew) allow a stack of pending events; then we could be sure that
3740 the reinsert happened right away and not lose any signals.
3742 Making this stack would also shrink the window in which breakpoints are
3743 uninserted (see comment in linux_wait_for_lwp) but not enough for
3744 complete correctness, so it won't solve that problem. It may be
3745 worthwhile just to solve this one, however. */
3746 if (lwp
->bp_reinsert
!= 0)
3749 debug_printf (" pending reinsert at 0x%s\n",
3750 paddress (lwp
->bp_reinsert
));
3752 if (can_hardware_single_step ())
3754 if (fast_tp_collecting
== 0)
3757 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
3759 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
3766 /* Postpone any pending signal. It was enqueued above. */
3770 if (fast_tp_collecting
== 1)
3773 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3774 " (exit-jump-pad-bkpt)\n",
3777 /* Postpone any pending signal. It was enqueued above. */
3780 else if (fast_tp_collecting
== 2)
3783 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3784 " single-stepping\n",
3787 if (can_hardware_single_step ())
3791 internal_error (__FILE__
, __LINE__
,
3792 "moving out of jump pad single-stepping"
3793 " not implemented on this target");
3796 /* Postpone any pending signal. It was enqueued above. */
3800 /* If we have while-stepping actions in this thread set it stepping.
3801 If we have a signal to deliver, it may or may not be set to
3802 SIG_IGN, we don't know. Assume so, and allow collecting
3803 while-stepping into a signal handler. A possible smart thing to
3804 do would be to set an internal breakpoint at the signal return
3805 address, continue, and carry on catching this while-stepping
3806 action only when that breakpoint is hit. A future
3808 if (thread
->while_stepping
!= NULL
3809 && can_hardware_single_step ())
3812 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
3817 if (proc
->tdesc
!= NULL
&& the_low_target
.get_pc
!= NULL
)
3819 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
3821 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
3825 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
3826 (long) lwp
->stop_pc
);
3830 /* If we have pending signals, consume one unless we are trying to
3831 reinsert a breakpoint or we're trying to finish a fast tracepoint
3833 if (lwp
->pending_signals
!= NULL
3834 && lwp
->bp_reinsert
== 0
3835 && fast_tp_collecting
== 0)
3837 struct pending_signals
**p_sig
;
3839 p_sig
= &lwp
->pending_signals
;
3840 while ((*p_sig
)->prev
!= NULL
)
3841 p_sig
= &(*p_sig
)->prev
;
3843 signal
= (*p_sig
)->signal
;
3844 if ((*p_sig
)->info
.si_signo
!= 0)
3845 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3852 if (the_low_target
.prepare_to_resume
!= NULL
)
3853 the_low_target
.prepare_to_resume (lwp
);
3855 regcache_invalidate_thread (thread
);
3857 lwp
->stepping
= step
;
3858 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (thread
),
3859 (PTRACE_TYPE_ARG3
) 0,
3860 /* Coerce to a uintptr_t first to avoid potential gcc warning
3861 of coercing an 8 byte integer to a 4 byte pointer. */
3862 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
3864 current_thread
= saved_thread
;
3866 perror_with_name ("resuming thread");
3868 /* Successfully resumed. Clear state that no longer makes sense,
3869 and mark the LWP as running. Must not do this before resuming
3870 otherwise if that fails other code will be confused. E.g., we'd
3871 later try to stop the LWP and hang forever waiting for a stop
3872 status. Note that we must not throw after this is cleared,
3873 otherwise handle_zombie_lwp_error would get confused. */
3875 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3878 /* Called when we try to resume a stopped LWP and that errors out. If
3879 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
3880 or about to become), discard the error, clear any pending status
3881 the LWP may have, and return true (we'll collect the exit status
3882 soon enough). Otherwise, return false. */
3885 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
3887 struct thread_info
*thread
= get_lwp_thread (lp
);
3889 /* If we get an error after resuming the LWP successfully, we'd
3890 confuse !T state for the LWP being gone. */
3891 gdb_assert (lp
->stopped
);
3893 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
3894 because even if ptrace failed with ESRCH, the tracee may be "not
3895 yet fully dead", but already refusing ptrace requests. In that
3896 case the tracee has 'R (Running)' state for a little bit
3897 (observed in Linux 3.18). See also the note on ESRCH in the
3898 ptrace(2) man page. Instead, check whether the LWP has any state
3899 other than ptrace-stopped. */
3901 /* Don't assume anything if /proc/PID/status can't be read. */
3902 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
3904 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3905 lp
->status_pending_p
= 0;
3911 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
3912 disappears while we try to resume it. */
3915 linux_resume_one_lwp (struct lwp_info
*lwp
,
3916 int step
, int signal
, siginfo_t
*info
)
3920 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
3922 CATCH (ex
, RETURN_MASK_ERROR
)
3924 if (!check_ptrace_stopped_lwp_gone (lwp
))
3925 throw_exception (ex
);
3930 struct thread_resume_array
3932 struct thread_resume
*resume
;
3936 /* This function is called once per thread via find_inferior.
3937 ARG is a pointer to a thread_resume_array struct.
3938 We look up the thread specified by ENTRY in ARG, and mark the thread
3939 with a pointer to the appropriate resume request.
3941 This algorithm is O(threads * resume elements), but resume elements
3942 is small (and will remain small at least until GDB supports thread
3946 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
3948 struct thread_info
*thread
= (struct thread_info
*) entry
;
3949 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3951 struct thread_resume_array
*r
;
3955 for (ndx
= 0; ndx
< r
->n
; ndx
++)
3957 ptid_t ptid
= r
->resume
[ndx
].thread
;
3958 if (ptid_equal (ptid
, minus_one_ptid
)
3959 || ptid_equal (ptid
, entry
->id
)
3960 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
3962 || (ptid_get_pid (ptid
) == pid_of (thread
)
3963 && (ptid_is_pid (ptid
)
3964 || ptid_get_lwp (ptid
) == -1)))
3966 if (r
->resume
[ndx
].kind
== resume_stop
3967 && thread
->last_resume_kind
== resume_stop
)
3970 debug_printf ("already %s LWP %ld at GDB's request\n",
3971 (thread
->last_status
.kind
3972 == TARGET_WAITKIND_STOPPED
)
3980 lwp
->resume
= &r
->resume
[ndx
];
3981 thread
->last_resume_kind
= lwp
->resume
->kind
;
3983 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
3984 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
3986 /* If we had a deferred signal to report, dequeue one now.
3987 This can happen if LWP gets more than one signal while
3988 trying to get out of a jump pad. */
3990 && !lwp
->status_pending_p
3991 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
3993 lwp
->status_pending_p
= 1;
3996 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
3997 "leaving status pending.\n",
3998 WSTOPSIG (lwp
->status_pending
),
4006 /* No resume action for this thread. */
4012 /* find_inferior callback for linux_resume.
4013 Set *FLAG_P if this lwp has an interesting status pending. */
4016 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
4018 struct thread_info
*thread
= (struct thread_info
*) entry
;
4019 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4021 /* LWPs which will not be resumed are not interesting, because
4022 we might not wait for them next time through linux_wait. */
4023 if (lwp
->resume
== NULL
)
4026 if (thread_still_has_status_pending_p (thread
))
4027 * (int *) flag_p
= 1;
4032 /* Return 1 if this lwp that GDB wants running is stopped at an
4033 internal breakpoint that we need to step over. It assumes that any
4034 required STOP_PC adjustment has already been propagated to the
4035 inferior's regcache. */
4038 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
4040 struct thread_info
*thread
= (struct thread_info
*) entry
;
4041 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4042 struct thread_info
*saved_thread
;
4044 struct process_info
*proc
= get_thread_process (thread
);
4046 /* GDBserver is skipping the extra traps from the wrapper program,
4047 don't have to do step over. */
4048 if (proc
->tdesc
== NULL
)
4051 /* LWPs which will not be resumed are not interesting, because we
4052 might not wait for them next time through linux_wait. */
4057 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4062 if (thread
->last_resume_kind
== resume_stop
)
4065 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4071 gdb_assert (lwp
->suspended
>= 0);
4076 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4081 if (!lwp
->need_step_over
)
4084 debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread
));
4087 if (lwp
->status_pending_p
)
4090 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4096 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4100 /* If the PC has changed since we stopped, then don't do anything,
4101 and let the breakpoint/tracepoint be hit. This happens if, for
4102 instance, GDB handled the decr_pc_after_break subtraction itself,
4103 GDB is OOL stepping this thread, or the user has issued a "jump"
4104 command, or poked thread's registers herself. */
4105 if (pc
!= lwp
->stop_pc
)
4108 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4109 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4111 paddress (lwp
->stop_pc
), paddress (pc
));
4113 lwp
->need_step_over
= 0;
4117 saved_thread
= current_thread
;
4118 current_thread
= thread
;
4120 /* We can only step over breakpoints we know about. */
4121 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4123 /* Don't step over a breakpoint that GDB expects to hit
4124 though. If the condition is being evaluated on the target's side
4125 and it evaluate to false, step over this breakpoint as well. */
4126 if (gdb_breakpoint_here (pc
)
4127 && gdb_condition_true_at_breakpoint (pc
)
4128 && gdb_no_commands_at_breakpoint (pc
))
4131 debug_printf ("Need step over [LWP %ld]? yes, but found"
4132 " GDB breakpoint at 0x%s; skipping step over\n",
4133 lwpid_of (thread
), paddress (pc
));
4135 current_thread
= saved_thread
;
4141 debug_printf ("Need step over [LWP %ld]? yes, "
4142 "found breakpoint at 0x%s\n",
4143 lwpid_of (thread
), paddress (pc
));
4145 /* We've found an lwp that needs stepping over --- return 1 so
4146 that find_inferior stops looking. */
4147 current_thread
= saved_thread
;
4149 /* If the step over is cancelled, this is set again. */
4150 lwp
->need_step_over
= 0;
4155 current_thread
= saved_thread
;
4158 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4160 lwpid_of (thread
), paddress (pc
));
4165 /* Start a step-over operation on LWP. When LWP stopped at a
4166 breakpoint, to make progress, we need to remove the breakpoint out
4167 of the way. If we let other threads run while we do that, they may
4168 pass by the breakpoint location and miss hitting it. To avoid
4169 that, a step-over momentarily stops all threads while LWP is
4170 single-stepped while the breakpoint is temporarily uninserted from
4171 the inferior. When the single-step finishes, we reinsert the
4172 breakpoint, and let all threads that are supposed to be running,
4175 On targets that don't support hardware single-step, we don't
4176 currently support full software single-stepping. Instead, we only
4177 support stepping over the thread event breakpoint, by asking the
4178 low target where to place a reinsert breakpoint. Since this
4179 routine assumes the breakpoint being stepped over is a thread event
4180 breakpoint, it usually assumes the return address of the current
4181 function is a good enough place to set the reinsert breakpoint. */
4184 start_step_over (struct lwp_info
*lwp
)
4186 struct thread_info
*thread
= get_lwp_thread (lwp
);
4187 struct thread_info
*saved_thread
;
4192 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4195 stop_all_lwps (1, lwp
);
4196 gdb_assert (lwp
->suspended
== 0);
4199 debug_printf ("Done stopping all threads for step-over.\n");
4201 /* Note, we should always reach here with an already adjusted PC,
4202 either by GDB (if we're resuming due to GDB's request), or by our
4203 caller, if we just finished handling an internal breakpoint GDB
4204 shouldn't care about. */
4207 saved_thread
= current_thread
;
4208 current_thread
= thread
;
4210 lwp
->bp_reinsert
= pc
;
4211 uninsert_breakpoints_at (pc
);
4212 uninsert_fast_tracepoint_jumps_at (pc
);
4214 if (can_hardware_single_step ())
4220 CORE_ADDR raddr
= (*the_low_target
.breakpoint_reinsert_addr
) ();
4221 set_reinsert_breakpoint (raddr
);
4225 current_thread
= saved_thread
;
4227 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4229 /* Require next event from this LWP. */
4230 step_over_bkpt
= thread
->entry
.id
;
4234 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4235 start_step_over, if still there, and delete any reinsert
4236 breakpoints we've set, on non hardware single-step targets. */
4239 finish_step_over (struct lwp_info
*lwp
)
4241 if (lwp
->bp_reinsert
!= 0)
4244 debug_printf ("Finished step over.\n");
4246 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4247 may be no breakpoint to reinsert there by now. */
4248 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4249 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4251 lwp
->bp_reinsert
= 0;
4253 /* Delete any software-single-step reinsert breakpoints. No
4254 longer needed. We don't have to worry about other threads
4255 hitting this trap, and later not being able to explain it,
4256 because we were stepping over a breakpoint, and we hold all
4257 threads but LWP stopped while doing that. */
4258 if (!can_hardware_single_step ())
4259 delete_reinsert_breakpoints ();
4261 step_over_bkpt
= null_ptid
;
4268 /* This function is called once per thread. We check the thread's resume
4269 request, which will tell us whether to resume, step, or leave the thread
4270 stopped; and what signal, if any, it should be sent.
4272 For threads which we aren't explicitly told otherwise, we preserve
4273 the stepping flag; this is used for stepping over gdbserver-placed
4276 If pending_flags was set in any thread, we queue any needed
4277 signals, since we won't actually resume. We already have a pending
4278 event to report, so we don't need to preserve any step requests;
4279 they should be re-issued if necessary. */
4282 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
4284 struct thread_info
*thread
= (struct thread_info
*) entry
;
4285 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4287 int leave_all_stopped
= * (int *) arg
;
4290 if (lwp
->resume
== NULL
)
4293 if (lwp
->resume
->kind
== resume_stop
)
4296 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4301 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
4303 /* Stop the thread, and wait for the event asynchronously,
4304 through the event loop. */
4310 debug_printf ("already stopped LWP %ld\n",
4313 /* The LWP may have been stopped in an internal event that
4314 was not meant to be notified back to GDB (e.g., gdbserver
4315 breakpoint), so we should be reporting a stop event in
4318 /* If the thread already has a pending SIGSTOP, this is a
4319 no-op. Otherwise, something later will presumably resume
4320 the thread and this will cause it to cancel any pending
4321 operation, due to last_resume_kind == resume_stop. If
4322 the thread already has a pending status to report, we
4323 will still report it the next time we wait - see
4324 status_pending_p_callback. */
4326 /* If we already have a pending signal to report, then
4327 there's no need to queue a SIGSTOP, as this means we're
4328 midway through moving the LWP out of the jumppad, and we
4329 will report the pending signal as soon as that is
4331 if (lwp
->pending_signals_to_report
== NULL
)
4335 /* For stop requests, we're done. */
4337 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4341 /* If this thread which is about to be resumed has a pending status,
4342 then don't resume any threads - we can just report the pending
4343 status. Make sure to queue any signals that would otherwise be
4344 sent. In all-stop mode, we do this decision based on if *any*
4345 thread has a pending status. If there's a thread that needs the
4346 step-over-breakpoint dance, then don't resume any other thread
4347 but that particular one. */
4348 leave_pending
= (lwp
->status_pending_p
|| leave_all_stopped
);
4353 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
4355 step
= (lwp
->resume
->kind
== resume_step
);
4356 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
4361 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
4363 /* If we have a new signal, enqueue the signal. */
4364 if (lwp
->resume
->sig
!= 0)
4366 struct pending_signals
*p_sig
;
4367 p_sig
= xmalloc (sizeof (*p_sig
));
4368 p_sig
->prev
= lwp
->pending_signals
;
4369 p_sig
->signal
= lwp
->resume
->sig
;
4370 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4372 /* If this is the same signal we were previously stopped by,
4373 make sure to queue its siginfo. We can ignore the return
4374 value of ptrace; if it fails, we'll skip
4375 PTRACE_SETSIGINFO. */
4376 if (WIFSTOPPED (lwp
->last_status
)
4377 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
4378 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4381 lwp
->pending_signals
= p_sig
;
4385 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4391 linux_resume (struct thread_resume
*resume_info
, size_t n
)
4393 struct thread_resume_array array
= { resume_info
, n
};
4394 struct thread_info
*need_step_over
= NULL
;
4396 int leave_all_stopped
;
4401 debug_printf ("linux_resume:\n");
4404 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
4406 /* If there is a thread which would otherwise be resumed, which has
4407 a pending status, then don't resume any threads - we can just
4408 report the pending status. Make sure to queue any signals that
4409 would otherwise be sent. In non-stop mode, we'll apply this
4410 logic to each thread individually. We consume all pending events
4411 before considering to start a step-over (in all-stop). */
4414 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
4416 /* If there is a thread which would otherwise be resumed, which is
4417 stopped at a breakpoint that needs stepping over, then don't
4418 resume any threads - have it step over the breakpoint with all
4419 other threads stopped, then resume all threads again. Make sure
4420 to queue any signals that would otherwise be delivered or
4422 if (!any_pending
&& supports_breakpoints ())
4424 = (struct thread_info
*) find_inferior (&all_threads
,
4425 need_step_over_p
, NULL
);
4427 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
4431 if (need_step_over
!= NULL
)
4432 debug_printf ("Not resuming all, need step over\n");
4433 else if (any_pending
)
4434 debug_printf ("Not resuming, all-stop and found "
4435 "an LWP with pending status\n");
4437 debug_printf ("Resuming, no pending status or step over needed\n");
4440 /* Even if we're leaving threads stopped, queue all signals we'd
4441 otherwise deliver. */
4442 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
4445 start_step_over (get_thread_lwp (need_step_over
));
4449 debug_printf ("linux_resume done\n");
4454 /* This function is called once per thread. We check the thread's
4455 last resume request, which will tell us whether to resume, step, or
4456 leave the thread stopped. Any signal the client requested to be
4457 delivered has already been enqueued at this point.
4459 If any thread that GDB wants running is stopped at an internal
4460 breakpoint that needs stepping over, we start a step-over operation
4461 on that particular thread, and leave all others stopped. */
4464 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4466 struct thread_info
*thread
= (struct thread_info
*) entry
;
4467 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4474 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
4479 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
4483 if (thread
->last_resume_kind
== resume_stop
4484 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
4487 debug_printf (" client wants LWP to remain %ld stopped\n",
4492 if (lwp
->status_pending_p
)
4495 debug_printf (" LWP %ld has pending status, leaving stopped\n",
4500 gdb_assert (lwp
->suspended
>= 0);
4505 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
4509 if (thread
->last_resume_kind
== resume_stop
4510 && lwp
->pending_signals_to_report
== NULL
4511 && lwp
->collecting_fast_tracepoint
== 0)
4513 /* We haven't reported this LWP as stopped yet (otherwise, the
4514 last_status.kind check above would catch it, and we wouldn't
4515 reach here. This LWP may have been momentarily paused by a
4516 stop_all_lwps call while handling for example, another LWP's
4517 step-over. In that case, the pending expected SIGSTOP signal
4518 that was queued at vCont;t handling time will have already
4519 been consumed by wait_for_sigstop, and so we need to requeue
4520 another one here. Note that if the LWP already has a SIGSTOP
4521 pending, this is a no-op. */
4524 debug_printf ("Client wants LWP %ld to stop. "
4525 "Making sure it has a SIGSTOP pending\n",
4531 step
= thread
->last_resume_kind
== resume_step
;
4532 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4537 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4539 struct thread_info
*thread
= (struct thread_info
*) entry
;
4540 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4546 gdb_assert (lwp
->suspended
>= 0);
4548 return proceed_one_lwp (entry
, except
);
4551 /* When we finish a step-over, set threads running again. If there's
4552 another thread that may need a step-over, now's the time to start
4553 it. Eventually, we'll move all threads past their breakpoints. */
4556 proceed_all_lwps (void)
4558 struct thread_info
*need_step_over
;
4560 /* If there is a thread which would otherwise be resumed, which is
4561 stopped at a breakpoint that needs stepping over, then don't
4562 resume any threads - have it step over the breakpoint with all
4563 other threads stopped, then resume all threads again. */
4565 if (supports_breakpoints ())
4568 = (struct thread_info
*) find_inferior (&all_threads
,
4569 need_step_over_p
, NULL
);
4571 if (need_step_over
!= NULL
)
4574 debug_printf ("proceed_all_lwps: found "
4575 "thread %ld needing a step-over\n",
4576 lwpid_of (need_step_over
));
4578 start_step_over (get_thread_lwp (need_step_over
));
4584 debug_printf ("Proceeding, no step-over needed\n");
4586 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
4589 /* Stopped LWPs that the client wanted to be running, that don't have
4590 pending statuses, are set to run again, except for EXCEPT, if not
4591 NULL. This undoes a stop_all_lwps call. */
4594 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
4600 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
4601 lwpid_of (get_lwp_thread (except
)));
4603 debug_printf ("unstopping all lwps\n");
4607 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
4609 find_inferior (&all_threads
, proceed_one_lwp
, except
);
4613 debug_printf ("unstop_all_lwps done\n");
4619 #ifdef HAVE_LINUX_REGSETS
4621 #define use_linux_regsets 1
4623 /* Returns true if REGSET has been disabled. */
4626 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
4628 return (info
->disabled_regsets
!= NULL
4629 && info
->disabled_regsets
[regset
- info
->regsets
]);
4632 /* Disable REGSET. */
4635 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
4639 dr_offset
= regset
- info
->regsets
;
4640 if (info
->disabled_regsets
== NULL
)
4641 info
->disabled_regsets
= xcalloc (1, info
->num_regsets
);
4642 info
->disabled_regsets
[dr_offset
] = 1;
4646 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
4647 struct regcache
*regcache
)
4649 struct regset_info
*regset
;
4650 int saw_general_regs
= 0;
4654 pid
= lwpid_of (current_thread
);
4655 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4660 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4663 buf
= xmalloc (regset
->size
);
4665 nt_type
= regset
->nt_type
;
4669 iov
.iov_len
= regset
->size
;
4670 data
= (void *) &iov
;
4676 res
= ptrace (regset
->get_request
, pid
,
4677 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4679 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4685 /* If we get EIO on a regset, do not try it again for
4686 this process mode. */
4687 disable_regset (regsets_info
, regset
);
4689 else if (errno
== ENODATA
)
4691 /* ENODATA may be returned if the regset is currently
4692 not "active". This can happen in normal operation,
4693 so suppress the warning in this case. */
4698 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
4705 if (regset
->type
== GENERAL_REGS
)
4706 saw_general_regs
= 1;
4707 regset
->store_function (regcache
, buf
);
4711 if (saw_general_regs
)
4718 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
4719 struct regcache
*regcache
)
4721 struct regset_info
*regset
;
4722 int saw_general_regs
= 0;
4726 pid
= lwpid_of (current_thread
);
4727 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4732 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
4733 || regset
->fill_function
== NULL
)
4736 buf
= xmalloc (regset
->size
);
4738 /* First fill the buffer with the current register set contents,
4739 in case there are any items in the kernel's regset that are
4740 not in gdbserver's regcache. */
4742 nt_type
= regset
->nt_type
;
4746 iov
.iov_len
= regset
->size
;
4747 data
= (void *) &iov
;
4753 res
= ptrace (regset
->get_request
, pid
,
4754 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4756 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4761 /* Then overlay our cached registers on that. */
4762 regset
->fill_function (regcache
, buf
);
4764 /* Only now do we write the register set. */
4766 res
= ptrace (regset
->set_request
, pid
,
4767 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4769 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
4777 /* If we get EIO on a regset, do not try it again for
4778 this process mode. */
4779 disable_regset (regsets_info
, regset
);
4781 else if (errno
== ESRCH
)
4783 /* At this point, ESRCH should mean the process is
4784 already gone, in which case we simply ignore attempts
4785 to change its registers. See also the related
4786 comment in linux_resume_one_lwp. */
4792 perror ("Warning: ptrace(regsets_store_inferior_registers)");
4795 else if (regset
->type
== GENERAL_REGS
)
4796 saw_general_regs
= 1;
4799 if (saw_general_regs
)
4805 #else /* !HAVE_LINUX_REGSETS */
4807 #define use_linux_regsets 0
4808 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
4809 #define regsets_store_inferior_registers(regsets_info, regcache) 1
4813 /* Return 1 if register REGNO is supported by one of the regset ptrace
4814 calls or 0 if it has to be transferred individually. */
4817 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
4819 unsigned char mask
= 1 << (regno
% 8);
4820 size_t index
= regno
/ 8;
4822 return (use_linux_regsets
4823 && (regs_info
->regset_bitmap
== NULL
4824 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
4827 #ifdef HAVE_LINUX_USRREGS
4830 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
4834 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
4835 error ("Invalid register number %d.", regnum
);
4837 addr
= usrregs
->regmap
[regnum
];
4842 /* Fetch one register. */
4844 fetch_register (const struct usrregs_info
*usrregs
,
4845 struct regcache
*regcache
, int regno
)
4852 if (regno
>= usrregs
->num_regs
)
4854 if ((*the_low_target
.cannot_fetch_register
) (regno
))
4857 regaddr
= register_addr (usrregs
, regno
);
4861 size
= ((register_size (regcache
->tdesc
, regno
)
4862 + sizeof (PTRACE_XFER_TYPE
) - 1)
4863 & -sizeof (PTRACE_XFER_TYPE
));
4864 buf
= alloca (size
);
4866 pid
= lwpid_of (current_thread
);
4867 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4870 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
4871 ptrace (PTRACE_PEEKUSER
, pid
,
4872 /* Coerce to a uintptr_t first to avoid potential gcc warning
4873 of coercing an 8 byte integer to a 4 byte pointer. */
4874 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
4875 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4877 error ("reading register %d: %s", regno
, strerror (errno
));
4880 if (the_low_target
.supply_ptrace_register
)
4881 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
4883 supply_register (regcache
, regno
, buf
);
4886 /* Store one register. */
4888 store_register (const struct usrregs_info
*usrregs
,
4889 struct regcache
*regcache
, int regno
)
4896 if (regno
>= usrregs
->num_regs
)
4898 if ((*the_low_target
.cannot_store_register
) (regno
))
4901 regaddr
= register_addr (usrregs
, regno
);
4905 size
= ((register_size (regcache
->tdesc
, regno
)
4906 + sizeof (PTRACE_XFER_TYPE
) - 1)
4907 & -sizeof (PTRACE_XFER_TYPE
));
4908 buf
= alloca (size
);
4909 memset (buf
, 0, size
);
4911 if (the_low_target
.collect_ptrace_register
)
4912 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
4914 collect_register (regcache
, regno
, buf
);
4916 pid
= lwpid_of (current_thread
);
4917 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4920 ptrace (PTRACE_POKEUSER
, pid
,
4921 /* Coerce to a uintptr_t first to avoid potential gcc warning
4922 about coercing an 8 byte integer to a 4 byte pointer. */
4923 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
4924 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
4927 /* At this point, ESRCH should mean the process is
4928 already gone, in which case we simply ignore attempts
4929 to change its registers. See also the related
4930 comment in linux_resume_one_lwp. */
4934 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
4935 error ("writing register %d: %s", regno
, strerror (errno
));
4937 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4941 /* Fetch all registers, or just one, from the child process.
4942 If REGNO is -1, do this for all registers, skipping any that are
4943 assumed to have been retrieved by regsets_fetch_inferior_registers,
4944 unless ALL is non-zero.
4945 Otherwise, REGNO specifies which register (so we can save time). */
4947 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
4948 struct regcache
*regcache
, int regno
, int all
)
4950 struct usrregs_info
*usr
= regs_info
->usrregs
;
4954 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4955 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4956 fetch_register (usr
, regcache
, regno
);
4959 fetch_register (usr
, regcache
, regno
);
4962 /* Store our register values back into the inferior.
4963 If REGNO is -1, do this for all registers, skipping any that are
4964 assumed to have been saved by regsets_store_inferior_registers,
4965 unless ALL is non-zero.
4966 Otherwise, REGNO specifies which register (so we can save time). */
4968 usr_store_inferior_registers (const struct regs_info
*regs_info
,
4969 struct regcache
*regcache
, int regno
, int all
)
4971 struct usrregs_info
*usr
= regs_info
->usrregs
;
4975 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4976 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4977 store_register (usr
, regcache
, regno
);
4980 store_register (usr
, regcache
, regno
);
4983 #else /* !HAVE_LINUX_USRREGS */
4985 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4986 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4992 linux_fetch_registers (struct regcache
*regcache
, int regno
)
4996 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5000 if (the_low_target
.fetch_register
!= NULL
5001 && regs_info
->usrregs
!= NULL
)
5002 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
5003 (*the_low_target
.fetch_register
) (regcache
, regno
);
5005 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
5006 if (regs_info
->usrregs
!= NULL
)
5007 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5011 if (the_low_target
.fetch_register
!= NULL
5012 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5015 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5017 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5019 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5020 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5025 linux_store_registers (struct regcache
*regcache
, int regno
)
5029 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5033 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5035 if (regs_info
->usrregs
!= NULL
)
5036 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5040 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5042 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5044 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5045 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5050 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5051 to debugger memory starting at MYADDR. */
5054 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5056 int pid
= lwpid_of (current_thread
);
5057 register PTRACE_XFER_TYPE
*buffer
;
5058 register CORE_ADDR addr
;
5065 /* Try using /proc. Don't bother for one word. */
5066 if (len
>= 3 * sizeof (long))
5070 /* We could keep this file open and cache it - possibly one per
5071 thread. That requires some juggling, but is even faster. */
5072 sprintf (filename
, "/proc/%d/mem", pid
);
5073 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5077 /* If pread64 is available, use it. It's faster if the kernel
5078 supports it (only one syscall), and it's 64-bit safe even on
5079 32-bit platforms (for instance, SPARC debugging a SPARC64
5082 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5085 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5086 bytes
= read (fd
, myaddr
, len
);
5093 /* Some data was read, we'll try to get the rest with ptrace. */
5103 /* Round starting address down to longword boundary. */
5104 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5105 /* Round ending address up; get number of longwords that makes. */
5106 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5107 / sizeof (PTRACE_XFER_TYPE
));
5108 /* Allocate buffer of that many longwords. */
5109 buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
5111 /* Read all the longwords */
5113 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5115 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5116 about coercing an 8 byte integer to a 4 byte pointer. */
5117 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5118 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5119 (PTRACE_TYPE_ARG4
) 0);
5125 /* Copy appropriate bytes out of the buffer. */
5128 i
*= sizeof (PTRACE_XFER_TYPE
);
5129 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5131 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5138 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5139 memory at MEMADDR. On failure (cannot write to the inferior)
5140 returns the value of errno. Always succeeds if LEN is zero. */
5143 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5146 /* Round starting address down to longword boundary. */
5147 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5148 /* Round ending address up; get number of longwords that makes. */
5150 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5151 / sizeof (PTRACE_XFER_TYPE
);
5153 /* Allocate buffer of that many longwords. */
5154 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*)
5155 alloca (count
* sizeof (PTRACE_XFER_TYPE
));
5157 int pid
= lwpid_of (current_thread
);
5161 /* Zero length write always succeeds. */
5167 /* Dump up to four bytes. */
5168 unsigned int val
= * (unsigned int *) myaddr
;
5174 val
= val
& 0xffffff;
5175 debug_printf ("Writing %0*x to 0x%08lx in process %d\n",
5176 2 * ((len
< 4) ? len
: 4), val
, (long)memaddr
, pid
);
5179 /* Fill start and end extra bytes of buffer with existing memory data. */
5182 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5183 about coercing an 8 byte integer to a 4 byte pointer. */
5184 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5185 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5186 (PTRACE_TYPE_ARG4
) 0);
5194 = ptrace (PTRACE_PEEKTEXT
, pid
,
5195 /* Coerce to a uintptr_t first to avoid potential gcc warning
5196 about coercing an 8 byte integer to a 4 byte pointer. */
5197 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5198 * sizeof (PTRACE_XFER_TYPE
)),
5199 (PTRACE_TYPE_ARG4
) 0);
5204 /* Copy data to be written over corresponding part of buffer. */
5206 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5209 /* Write the entire buffer. */
5211 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5214 ptrace (PTRACE_POKETEXT
, pid
,
5215 /* Coerce to a uintptr_t first to avoid potential gcc warning
5216 about coercing an 8 byte integer to a 4 byte pointer. */
5217 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5218 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5227 linux_look_up_symbols (void)
5229 #ifdef USE_THREAD_DB
5230 struct process_info
*proc
= current_process ();
5232 if (proc
->priv
->thread_db
!= NULL
)
5235 /* If the kernel supports tracing clones, then we don't need to
5236 use the magic thread event breakpoint to learn about
5238 thread_db_init (!linux_supports_traceclone ());
5243 linux_request_interrupt (void)
5245 extern unsigned long signal_pid
;
5247 /* Send a SIGINT to the process group. This acts just like the user
5248 typed a ^C on the controlling terminal. */
5249 kill (-signal_pid
, SIGINT
);
5252 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5253 to debugger memory starting at MYADDR. */
5256 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5258 char filename
[PATH_MAX
];
5260 int pid
= lwpid_of (current_thread
);
5262 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5264 fd
= open (filename
, O_RDONLY
);
5268 if (offset
!= (CORE_ADDR
) 0
5269 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5272 n
= read (fd
, myaddr
, len
);
5279 /* These breakpoint and watchpoint related wrapper functions simply
5280 pass on the function call if the target has registered a
5281 corresponding function. */
5284 linux_supports_z_point_type (char z_type
)
5286 return (the_low_target
.supports_z_point_type
!= NULL
5287 && the_low_target
.supports_z_point_type (z_type
));
5291 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5292 int size
, struct raw_breakpoint
*bp
)
5294 if (type
== raw_bkpt_type_sw
)
5295 return insert_memory_breakpoint (bp
);
5296 else if (the_low_target
.insert_point
!= NULL
)
5297 return the_low_target
.insert_point (type
, addr
, size
, bp
);
5299 /* Unsupported (see target.h). */
5304 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5305 int size
, struct raw_breakpoint
*bp
)
5307 if (type
== raw_bkpt_type_sw
)
5308 return remove_memory_breakpoint (bp
);
5309 else if (the_low_target
.remove_point
!= NULL
)
5310 return the_low_target
.remove_point (type
, addr
, size
, bp
);
5312 /* Unsupported (see target.h). */
5316 /* Implement the to_stopped_by_sw_breakpoint target_ops
5320 linux_stopped_by_sw_breakpoint (void)
5322 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5324 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
5327 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
5331 linux_supports_stopped_by_sw_breakpoint (void)
5333 return USE_SIGTRAP_SIGINFO
;
5336 /* Implement the to_stopped_by_hw_breakpoint target_ops
5340 linux_stopped_by_hw_breakpoint (void)
5342 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5344 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
5347 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
5351 linux_supports_stopped_by_hw_breakpoint (void)
5353 return USE_SIGTRAP_SIGINFO
;
5356 /* Implement the supports_conditional_breakpoints target_ops
5360 linux_supports_conditional_breakpoints (void)
5362 /* GDBserver needs to step over the breakpoint if the condition is
5363 false. GDBserver software single step is too simple, so disable
5364 conditional breakpoints if the target doesn't have hardware single
5366 return can_hardware_single_step ();
5370 linux_stopped_by_watchpoint (void)
5372 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5374 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
5378 linux_stopped_data_address (void)
5380 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5382 return lwp
->stopped_data_address
;
5385 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
5386 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
5387 && defined(PT_TEXT_END_ADDR)
5389 /* This is only used for targets that define PT_TEXT_ADDR,
5390 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
5391 the target has different ways of acquiring this information, like
5394 /* Under uClinux, programs are loaded at non-zero offsets, which we need
5395 to tell gdb about. */
5398 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
5400 unsigned long text
, text_end
, data
;
5401 int pid
= lwpid_of (current_thread
);
5405 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
5406 (PTRACE_TYPE_ARG4
) 0);
5407 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
5408 (PTRACE_TYPE_ARG4
) 0);
5409 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
5410 (PTRACE_TYPE_ARG4
) 0);
5414 /* Both text and data offsets produced at compile-time (and so
5415 used by gdb) are relative to the beginning of the program,
5416 with the data segment immediately following the text segment.
5417 However, the actual runtime layout in memory may put the data
5418 somewhere else, so when we send gdb a data base-address, we
5419 use the real data base address and subtract the compile-time
5420 data base-address from it (which is just the length of the
5421 text segment). BSS immediately follows data in both
5424 *data_p
= data
- (text_end
- text
);
5433 linux_qxfer_osdata (const char *annex
,
5434 unsigned char *readbuf
, unsigned const char *writebuf
,
5435 CORE_ADDR offset
, int len
)
5437 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
5440 /* Convert a native/host siginfo object, into/from the siginfo in the
5441 layout of the inferiors' architecture. */
5444 siginfo_fixup (siginfo_t
*siginfo
, void *inf_siginfo
, int direction
)
5448 if (the_low_target
.siginfo_fixup
!= NULL
)
5449 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
5451 /* If there was no callback, or the callback didn't do anything,
5452 then just do a straight memcpy. */
5456 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
5458 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
5463 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
5464 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
5468 char inf_siginfo
[sizeof (siginfo_t
)];
5470 if (current_thread
== NULL
)
5473 pid
= lwpid_of (current_thread
);
5476 debug_printf ("%s siginfo for lwp %d.\n",
5477 readbuf
!= NULL
? "Reading" : "Writing",
5480 if (offset
>= sizeof (siginfo
))
5483 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5486 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
5487 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
5488 inferior with a 64-bit GDBSERVER should look the same as debugging it
5489 with a 32-bit GDBSERVER, we need to convert it. */
5490 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
5492 if (offset
+ len
> sizeof (siginfo
))
5493 len
= sizeof (siginfo
) - offset
;
5495 if (readbuf
!= NULL
)
5496 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
5499 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
5501 /* Convert back to ptrace layout before flushing it out. */
5502 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
5504 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5511 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5512 so we notice when children change state; as the handler for the
5513 sigsuspend in my_waitpid. */
5516 sigchld_handler (int signo
)
5518 int old_errno
= errno
;
5524 /* fprintf is not async-signal-safe, so call write
5526 if (write (2, "sigchld_handler\n",
5527 sizeof ("sigchld_handler\n") - 1) < 0)
5528 break; /* just ignore */
5532 if (target_is_async_p ())
5533 async_file_mark (); /* trigger a linux_wait */
5539 linux_supports_non_stop (void)
5545 linux_async (int enable
)
5547 int previous
= target_is_async_p ();
5550 debug_printf ("linux_async (%d), previous=%d\n",
5553 if (previous
!= enable
)
5556 sigemptyset (&mask
);
5557 sigaddset (&mask
, SIGCHLD
);
5559 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
5563 if (pipe (linux_event_pipe
) == -1)
5565 linux_event_pipe
[0] = -1;
5566 linux_event_pipe
[1] = -1;
5567 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5569 warning ("creating event pipe failed.");
5573 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5574 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5576 /* Register the event loop handler. */
5577 add_file_handler (linux_event_pipe
[0],
5578 handle_target_event
, NULL
);
5580 /* Always trigger a linux_wait. */
5585 delete_file_handler (linux_event_pipe
[0]);
5587 close (linux_event_pipe
[0]);
5588 close (linux_event_pipe
[1]);
5589 linux_event_pipe
[0] = -1;
5590 linux_event_pipe
[1] = -1;
5593 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5600 linux_start_non_stop (int nonstop
)
5602 /* Register or unregister from event-loop accordingly. */
5603 linux_async (nonstop
);
5605 if (target_is_async_p () != (nonstop
!= 0))
5612 linux_supports_multi_process (void)
5617 /* Check if fork events are supported. */
5620 linux_supports_fork_events (void)
5622 return linux_supports_tracefork ();
5625 /* Check if vfork events are supported. */
5628 linux_supports_vfork_events (void)
5630 return linux_supports_tracefork ();
5633 /* Callback for 'find_inferior'. Set the (possibly changed) ptrace
5634 options for the specified lwp. */
5637 reset_lwp_ptrace_options_callback (struct inferior_list_entry
*entry
,
5640 struct thread_info
*thread
= (struct thread_info
*) entry
;
5641 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5645 /* Stop the lwp so we can modify its ptrace options. */
5646 lwp
->must_set_ptrace_flags
= 1;
5647 linux_stop_lwp (lwp
);
5651 /* Already stopped; go ahead and set the ptrace options. */
5652 struct process_info
*proc
= find_process_pid (pid_of (thread
));
5653 int options
= linux_low_ptrace_options (proc
->attached
);
5655 linux_enable_event_reporting (lwpid_of (thread
), options
);
5656 lwp
->must_set_ptrace_flags
= 0;
5662 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
5663 ptrace flags for all inferiors. This is in case the new GDB connection
5664 doesn't support the same set of events that the previous one did. */
5667 linux_handle_new_gdb_connection (void)
5671 /* Request that all the lwps reset their ptrace options. */
5672 find_inferior (&all_threads
, reset_lwp_ptrace_options_callback
, &pid
);
5676 linux_supports_disable_randomization (void)
5678 #ifdef HAVE_PERSONALITY
5686 linux_supports_agent (void)
5692 linux_supports_range_stepping (void)
5694 if (*the_low_target
.supports_range_stepping
== NULL
)
5697 return (*the_low_target
.supports_range_stepping
) ();
5700 /* Enumerate spufs IDs for process PID. */
5702 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
5708 struct dirent
*entry
;
5710 sprintf (path
, "/proc/%ld/fd", pid
);
5711 dir
= opendir (path
);
5716 while ((entry
= readdir (dir
)) != NULL
)
5722 fd
= atoi (entry
->d_name
);
5726 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
5727 if (stat (path
, &st
) != 0)
5729 if (!S_ISDIR (st
.st_mode
))
5732 if (statfs (path
, &stfs
) != 0)
5734 if (stfs
.f_type
!= SPUFS_MAGIC
)
5737 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
5739 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
5749 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
5750 object type, using the /proc file system. */
5752 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
5753 unsigned const char *writebuf
,
5754 CORE_ADDR offset
, int len
)
5756 long pid
= lwpid_of (current_thread
);
5761 if (!writebuf
&& !readbuf
)
5769 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
5772 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
5773 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
5778 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5785 ret
= write (fd
, writebuf
, (size_t) len
);
5787 ret
= read (fd
, readbuf
, (size_t) len
);
5793 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
5794 struct target_loadseg
5796 /* Core address to which the segment is mapped. */
5798 /* VMA recorded in the program header. */
5800 /* Size of this segment in memory. */
5804 # if defined PT_GETDSBT
5805 struct target_loadmap
5807 /* Protocol version number, must be zero. */
5809 /* Pointer to the DSBT table, its size, and the DSBT index. */
5810 unsigned *dsbt_table
;
5811 unsigned dsbt_size
, dsbt_index
;
5812 /* Number of segments in this map. */
5814 /* The actual memory map. */
5815 struct target_loadseg segs
[/*nsegs*/];
5817 # define LINUX_LOADMAP PT_GETDSBT
5818 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
5819 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
5821 struct target_loadmap
5823 /* Protocol version number, must be zero. */
5825 /* Number of segments in this map. */
5827 /* The actual memory map. */
5828 struct target_loadseg segs
[/*nsegs*/];
5830 # define LINUX_LOADMAP PTRACE_GETFDPIC
5831 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
5832 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
5836 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
5837 unsigned char *myaddr
, unsigned int len
)
5839 int pid
= lwpid_of (current_thread
);
5841 struct target_loadmap
*data
= NULL
;
5842 unsigned int actual_length
, copy_length
;
5844 if (strcmp (annex
, "exec") == 0)
5845 addr
= (int) LINUX_LOADMAP_EXEC
;
5846 else if (strcmp (annex
, "interp") == 0)
5847 addr
= (int) LINUX_LOADMAP_INTERP
;
5851 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
5857 actual_length
= sizeof (struct target_loadmap
)
5858 + sizeof (struct target_loadseg
) * data
->nsegs
;
5860 if (offset
< 0 || offset
> actual_length
)
5863 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
5864 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
5868 # define linux_read_loadmap NULL
5869 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
5872 linux_process_qsupported (const char *query
)
5874 if (the_low_target
.process_qsupported
!= NULL
)
5875 the_low_target
.process_qsupported (query
);
5879 linux_supports_tracepoints (void)
5881 if (*the_low_target
.supports_tracepoints
== NULL
)
5884 return (*the_low_target
.supports_tracepoints
) ();
5888 linux_read_pc (struct regcache
*regcache
)
5890 if (the_low_target
.get_pc
== NULL
)
5893 return (*the_low_target
.get_pc
) (regcache
);
5897 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
5899 gdb_assert (the_low_target
.set_pc
!= NULL
);
5901 (*the_low_target
.set_pc
) (regcache
, pc
);
5905 linux_thread_stopped (struct thread_info
*thread
)
5907 return get_thread_lwp (thread
)->stopped
;
5910 /* This exposes stop-all-threads functionality to other modules. */
5913 linux_pause_all (int freeze
)
5915 stop_all_lwps (freeze
, NULL
);
5918 /* This exposes unstop-all-threads functionality to other gdbserver
5922 linux_unpause_all (int unfreeze
)
5924 unstop_all_lwps (unfreeze
, NULL
);
5928 linux_prepare_to_access_memory (void)
5930 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5933 linux_pause_all (1);
5938 linux_done_accessing_memory (void)
5940 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5943 linux_unpause_all (1);
5947 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
5948 CORE_ADDR collector
,
5951 CORE_ADDR
*jump_entry
,
5952 CORE_ADDR
*trampoline
,
5953 ULONGEST
*trampoline_size
,
5954 unsigned char *jjump_pad_insn
,
5955 ULONGEST
*jjump_pad_insn_size
,
5956 CORE_ADDR
*adjusted_insn_addr
,
5957 CORE_ADDR
*adjusted_insn_addr_end
,
5960 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
5961 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
5962 jump_entry
, trampoline
, trampoline_size
,
5963 jjump_pad_insn
, jjump_pad_insn_size
,
5964 adjusted_insn_addr
, adjusted_insn_addr_end
,
5968 static struct emit_ops
*
5969 linux_emit_ops (void)
5971 if (the_low_target
.emit_ops
!= NULL
)
5972 return (*the_low_target
.emit_ops
) ();
5978 linux_get_min_fast_tracepoint_insn_len (void)
5980 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
5983 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
5986 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
5987 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
5989 char filename
[PATH_MAX
];
5991 const int auxv_size
= is_elf64
5992 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
5993 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
5995 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5997 fd
= open (filename
, O_RDONLY
);
6003 while (read (fd
, buf
, auxv_size
) == auxv_size
6004 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6008 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6010 switch (aux
->a_type
)
6013 *phdr_memaddr
= aux
->a_un
.a_val
;
6016 *num_phdr
= aux
->a_un
.a_val
;
6022 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6024 switch (aux
->a_type
)
6027 *phdr_memaddr
= aux
->a_un
.a_val
;
6030 *num_phdr
= aux
->a_un
.a_val
;
6038 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6040 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6041 "phdr_memaddr = %ld, phdr_num = %d",
6042 (long) *phdr_memaddr
, *num_phdr
);
6049 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6052 get_dynamic (const int pid
, const int is_elf64
)
6054 CORE_ADDR phdr_memaddr
, relocation
;
6056 unsigned char *phdr_buf
;
6057 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6059 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6062 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6063 phdr_buf
= alloca (num_phdr
* phdr_size
);
6065 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6068 /* Compute relocation: it is expected to be 0 for "regular" executables,
6069 non-zero for PIE ones. */
6071 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6074 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6076 if (p
->p_type
== PT_PHDR
)
6077 relocation
= phdr_memaddr
- p
->p_vaddr
;
6081 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6083 if (p
->p_type
== PT_PHDR
)
6084 relocation
= phdr_memaddr
- p
->p_vaddr
;
6087 if (relocation
== -1)
6089 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6090 any real world executables, including PIE executables, have always
6091 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6092 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6093 or present DT_DEBUG anyway (fpc binaries are statically linked).
6095 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6097 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6102 for (i
= 0; i
< num_phdr
; i
++)
6106 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6108 if (p
->p_type
== PT_DYNAMIC
)
6109 return p
->p_vaddr
+ relocation
;
6113 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6115 if (p
->p_type
== PT_DYNAMIC
)
6116 return p
->p_vaddr
+ relocation
;
6123 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6124 can be 0 if the inferior does not yet have the library list initialized.
6125 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6126 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6129 get_r_debug (const int pid
, const int is_elf64
)
6131 CORE_ADDR dynamic_memaddr
;
6132 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6133 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6136 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6137 if (dynamic_memaddr
== 0)
6140 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6144 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6145 #ifdef DT_MIPS_RLD_MAP
6149 unsigned char buf
[sizeof (Elf64_Xword
)];
6153 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6155 if (linux_read_memory (dyn
->d_un
.d_val
,
6156 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6161 #endif /* DT_MIPS_RLD_MAP */
6163 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6164 map
= dyn
->d_un
.d_val
;
6166 if (dyn
->d_tag
== DT_NULL
)
6171 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6172 #ifdef DT_MIPS_RLD_MAP
6176 unsigned char buf
[sizeof (Elf32_Word
)];
6180 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6182 if (linux_read_memory (dyn
->d_un
.d_val
,
6183 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6188 #endif /* DT_MIPS_RLD_MAP */
6190 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6191 map
= dyn
->d_un
.d_val
;
6193 if (dyn
->d_tag
== DT_NULL
)
6197 dynamic_memaddr
+= dyn_size
;
6203 /* Read one pointer from MEMADDR in the inferior. */
6206 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6210 /* Go through a union so this works on either big or little endian
6211 hosts, when the inferior's pointer size is smaller than the size
6212 of CORE_ADDR. It is assumed the inferior's endianness is the
6213 same of the superior's. */
6216 CORE_ADDR core_addr
;
6221 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6224 if (ptr_size
== sizeof (CORE_ADDR
))
6225 *ptr
= addr
.core_addr
;
6226 else if (ptr_size
== sizeof (unsigned int))
6229 gdb_assert_not_reached ("unhandled pointer size");
6234 struct link_map_offsets
6236 /* Offset and size of r_debug.r_version. */
6237 int r_version_offset
;
6239 /* Offset and size of r_debug.r_map. */
6242 /* Offset to l_addr field in struct link_map. */
6245 /* Offset to l_name field in struct link_map. */
6248 /* Offset to l_ld field in struct link_map. */
6251 /* Offset to l_next field in struct link_map. */
6254 /* Offset to l_prev field in struct link_map. */
6258 /* Construct qXfer:libraries-svr4:read reply. */
6261 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
6262 unsigned const char *writebuf
,
6263 CORE_ADDR offset
, int len
)
6266 unsigned document_len
;
6267 struct process_info_private
*const priv
= current_process ()->priv
;
6268 char filename
[PATH_MAX
];
6271 static const struct link_map_offsets lmo_32bit_offsets
=
6273 0, /* r_version offset. */
6274 4, /* r_debug.r_map offset. */
6275 0, /* l_addr offset in link_map. */
6276 4, /* l_name offset in link_map. */
6277 8, /* l_ld offset in link_map. */
6278 12, /* l_next offset in link_map. */
6279 16 /* l_prev offset in link_map. */
6282 static const struct link_map_offsets lmo_64bit_offsets
=
6284 0, /* r_version offset. */
6285 8, /* r_debug.r_map offset. */
6286 0, /* l_addr offset in link_map. */
6287 8, /* l_name offset in link_map. */
6288 16, /* l_ld offset in link_map. */
6289 24, /* l_next offset in link_map. */
6290 32 /* l_prev offset in link_map. */
6292 const struct link_map_offsets
*lmo
;
6293 unsigned int machine
;
6295 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
6296 int allocated
= 1024;
6298 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
6299 int header_done
= 0;
6301 if (writebuf
!= NULL
)
6303 if (readbuf
== NULL
)
6306 pid
= lwpid_of (current_thread
);
6307 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
6308 is_elf64
= elf_64_file_p (filename
, &machine
);
6309 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
6310 ptr_size
= is_elf64
? 8 : 4;
6312 while (annex
[0] != '\0')
6318 sep
= strchr (annex
, '=');
6323 if (len
== 5 && startswith (annex
, "start"))
6325 else if (len
== 4 && startswith (annex
, "prev"))
6329 annex
= strchr (sep
, ';');
6336 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
6343 if (priv
->r_debug
== 0)
6344 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
6346 /* We failed to find DT_DEBUG. Such situation will not change
6347 for this inferior - do not retry it. Report it to GDB as
6348 E01, see for the reasons at the GDB solib-svr4.c side. */
6349 if (priv
->r_debug
== (CORE_ADDR
) -1)
6352 if (priv
->r_debug
!= 0)
6354 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
6355 (unsigned char *) &r_version
,
6356 sizeof (r_version
)) != 0
6359 warning ("unexpected r_debug version %d", r_version
);
6361 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
6362 &lm_addr
, ptr_size
) != 0)
6364 warning ("unable to read r_map from 0x%lx",
6365 (long) priv
->r_debug
+ lmo
->r_map_offset
);
6370 document
= xmalloc (allocated
);
6371 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
6372 p
= document
+ strlen (document
);
6375 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
6376 &l_name
, ptr_size
) == 0
6377 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
6378 &l_addr
, ptr_size
) == 0
6379 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
6380 &l_ld
, ptr_size
) == 0
6381 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
6382 &l_prev
, ptr_size
) == 0
6383 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
6384 &l_next
, ptr_size
) == 0)
6386 unsigned char libname
[PATH_MAX
];
6388 if (lm_prev
!= l_prev
)
6390 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
6391 (long) lm_prev
, (long) l_prev
);
6395 /* Ignore the first entry even if it has valid name as the first entry
6396 corresponds to the main executable. The first entry should not be
6397 skipped if the dynamic loader was loaded late by a static executable
6398 (see solib-svr4.c parameter ignore_first). But in such case the main
6399 executable does not have PT_DYNAMIC present and this function already
6400 exited above due to failed get_r_debug. */
6403 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
6408 /* Not checking for error because reading may stop before
6409 we've got PATH_MAX worth of characters. */
6411 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
6412 libname
[sizeof (libname
) - 1] = '\0';
6413 if (libname
[0] != '\0')
6415 /* 6x the size for xml_escape_text below. */
6416 size_t len
= 6 * strlen ((char *) libname
);
6421 /* Terminate `<library-list-svr4'. */
6426 while (allocated
< p
- document
+ len
+ 200)
6428 /* Expand to guarantee sufficient storage. */
6429 uintptr_t document_len
= p
- document
;
6431 document
= xrealloc (document
, 2 * allocated
);
6433 p
= document
+ document_len
;
6436 name
= xml_escape_text ((char *) libname
);
6437 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
6438 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
6439 name
, (unsigned long) lm_addr
,
6440 (unsigned long) l_addr
, (unsigned long) l_ld
);
6451 /* Empty list; terminate `<library-list-svr4'. */
6455 strcpy (p
, "</library-list-svr4>");
6457 document_len
= strlen (document
);
6458 if (offset
< document_len
)
6459 document_len
-= offset
;
6462 if (len
> document_len
)
6465 memcpy (readbuf
, document
+ offset
, len
);
6471 #ifdef HAVE_LINUX_BTRACE
6473 /* See to_enable_btrace target method. */
6475 static struct btrace_target_info
*
6476 linux_low_enable_btrace (ptid_t ptid
, const struct btrace_config
*conf
)
6478 struct btrace_target_info
*tinfo
;
6480 tinfo
= linux_enable_btrace (ptid
, conf
);
6482 if (tinfo
!= NULL
&& tinfo
->ptr_bits
== 0)
6484 struct thread_info
*thread
= find_thread_ptid (ptid
);
6485 struct regcache
*regcache
= get_thread_regcache (thread
, 0);
6487 tinfo
->ptr_bits
= register_size (regcache
->tdesc
, 0) * 8;
6493 /* See to_disable_btrace target method. */
6496 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
6498 enum btrace_error err
;
6500 err
= linux_disable_btrace (tinfo
);
6501 return (err
== BTRACE_ERR_NONE
? 0 : -1);
6504 /* Encode an Intel(R) Processor Trace configuration. */
6507 linux_low_encode_pt_config (struct buffer
*buffer
,
6508 const struct btrace_data_pt_config
*config
)
6510 buffer_grow_str (buffer
, "<pt-config>\n");
6512 switch (config
->cpu
.vendor
)
6515 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
6516 "model=\"%u\" stepping=\"%u\"/>\n",
6517 config
->cpu
.family
, config
->cpu
.model
,
6518 config
->cpu
.stepping
);
6525 buffer_grow_str (buffer
, "</pt-config>\n");
6528 /* Encode a raw buffer. */
6531 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
6537 /* We use hex encoding - see common/rsp-low.h. */
6538 buffer_grow_str (buffer
, "<raw>\n");
6544 elem
[0] = tohex ((*data
>> 4) & 0xf);
6545 elem
[1] = tohex (*data
++ & 0xf);
6547 buffer_grow (buffer
, elem
, 2);
6550 buffer_grow_str (buffer
, "</raw>\n");
6553 /* See to_read_btrace target method. */
6556 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
6559 struct btrace_data btrace
;
6560 struct btrace_block
*block
;
6561 enum btrace_error err
;
6564 btrace_data_init (&btrace
);
6566 err
= linux_read_btrace (&btrace
, tinfo
, type
);
6567 if (err
!= BTRACE_ERR_NONE
)
6569 if (err
== BTRACE_ERR_OVERFLOW
)
6570 buffer_grow_str0 (buffer
, "E.Overflow.");
6572 buffer_grow_str0 (buffer
, "E.Generic Error.");
6577 switch (btrace
.format
)
6579 case BTRACE_FORMAT_NONE
:
6580 buffer_grow_str0 (buffer
, "E.No Trace.");
6583 case BTRACE_FORMAT_BTS
:
6584 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
6585 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
6588 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
6590 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
6591 paddress (block
->begin
), paddress (block
->end
));
6593 buffer_grow_str0 (buffer
, "</btrace>\n");
6596 case BTRACE_FORMAT_PT
:
6597 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
6598 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
6599 buffer_grow_str (buffer
, "<pt>\n");
6601 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
6603 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
6604 btrace
.variant
.pt
.size
);
6606 buffer_grow_str (buffer
, "</pt>\n");
6607 buffer_grow_str0 (buffer
, "</btrace>\n");
6611 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
6615 btrace_data_fini (&btrace
);
6619 btrace_data_fini (&btrace
);
6623 /* See to_btrace_conf target method. */
6626 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
6627 struct buffer
*buffer
)
6629 const struct btrace_config
*conf
;
6631 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
6632 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
6634 conf
= linux_btrace_conf (tinfo
);
6637 switch (conf
->format
)
6639 case BTRACE_FORMAT_NONE
:
6642 case BTRACE_FORMAT_BTS
:
6643 buffer_xml_printf (buffer
, "<bts");
6644 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
6645 buffer_xml_printf (buffer
, " />\n");
6648 case BTRACE_FORMAT_PT
:
6649 buffer_xml_printf (buffer
, "<pt");
6650 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
6651 buffer_xml_printf (buffer
, "/>\n");
6656 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
6659 #endif /* HAVE_LINUX_BTRACE */
6661 /* See nat/linux-nat.h. */
6664 current_lwp_ptid (void)
6666 return ptid_of (current_thread
);
6669 static struct target_ops linux_target_ops
= {
6670 linux_create_inferior
,
6680 linux_fetch_registers
,
6681 linux_store_registers
,
6682 linux_prepare_to_access_memory
,
6683 linux_done_accessing_memory
,
6686 linux_look_up_symbols
,
6687 linux_request_interrupt
,
6689 linux_supports_z_point_type
,
6692 linux_stopped_by_sw_breakpoint
,
6693 linux_supports_stopped_by_sw_breakpoint
,
6694 linux_stopped_by_hw_breakpoint
,
6695 linux_supports_stopped_by_hw_breakpoint
,
6696 linux_supports_conditional_breakpoints
,
6697 linux_stopped_by_watchpoint
,
6698 linux_stopped_data_address
,
6699 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6700 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6701 && defined(PT_TEXT_END_ADDR)
6706 #ifdef USE_THREAD_DB
6707 thread_db_get_tls_address
,
6712 hostio_last_error_from_errno
,
6715 linux_supports_non_stop
,
6717 linux_start_non_stop
,
6718 linux_supports_multi_process
,
6719 linux_supports_fork_events
,
6720 linux_supports_vfork_events
,
6721 linux_handle_new_gdb_connection
,
6722 #ifdef USE_THREAD_DB
6723 thread_db_handle_monitor_command
,
6727 linux_common_core_of_thread
,
6729 linux_process_qsupported
,
6730 linux_supports_tracepoints
,
6733 linux_thread_stopped
,
6737 linux_stabilize_threads
,
6738 linux_install_fast_tracepoint_jump_pad
,
6740 linux_supports_disable_randomization
,
6741 linux_get_min_fast_tracepoint_insn_len
,
6742 linux_qxfer_libraries_svr4
,
6743 linux_supports_agent
,
6744 #ifdef HAVE_LINUX_BTRACE
6745 linux_supports_btrace
,
6746 linux_low_enable_btrace
,
6747 linux_low_disable_btrace
,
6748 linux_low_read_btrace
,
6749 linux_low_btrace_conf
,
6757 linux_supports_range_stepping
,
6758 linux_proc_pid_to_exec_file
,
6759 linux_mntns_open_cloexec
,
6761 linux_mntns_readlink
,
6765 linux_init_signals ()
6767 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
6768 to find what the cancel signal actually is. */
6769 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
6770 signal (__SIGRTMIN
+1, SIG_IGN
);
6774 #ifdef HAVE_LINUX_REGSETS
6776 initialize_regsets_info (struct regsets_info
*info
)
6778 for (info
->num_regsets
= 0;
6779 info
->regsets
[info
->num_regsets
].size
>= 0;
6780 info
->num_regsets
++)
6786 initialize_low (void)
6788 struct sigaction sigchld_action
;
6789 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
6790 set_target_ops (&linux_target_ops
);
6791 set_breakpoint_data (the_low_target
.breakpoint
,
6792 the_low_target
.breakpoint_len
);
6793 linux_init_signals ();
6794 linux_ptrace_init_warnings ();
6796 sigchld_action
.sa_handler
= sigchld_handler
;
6797 sigemptyset (&sigchld_action
.sa_mask
);
6798 sigchld_action
.sa_flags
= SA_RESTART
;
6799 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
6801 initialize_low_arch ();
6803 linux_check_ptrace_features ();