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 <sys/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. */
144 /* See nat/linux-nat.h. */
147 ptid_of_lwp (struct lwp_info
*lwp
)
149 return ptid_of (get_lwp_thread (lwp
));
152 /* See nat/linux-nat.h. */
155 lwp_set_arch_private_info (struct lwp_info
*lwp
,
156 struct arch_lwp_info
*info
)
158 lwp
->arch_private
= info
;
161 /* See nat/linux-nat.h. */
163 struct arch_lwp_info
*
164 lwp_arch_private_info (struct lwp_info
*lwp
)
166 return lwp
->arch_private
;
169 /* See nat/linux-nat.h. */
172 lwp_is_stopped (struct lwp_info
*lwp
)
177 /* See nat/linux-nat.h. */
179 enum target_stop_reason
180 lwp_stop_reason (struct lwp_info
*lwp
)
182 return lwp
->stop_reason
;
185 /* A list of all unknown processes which receive stop signals. Some
186 other process will presumably claim each of these as forked
187 children momentarily. */
189 struct simple_pid_list
191 /* The process ID. */
194 /* The status as reported by waitpid. */
198 struct simple_pid_list
*next
;
200 struct simple_pid_list
*stopped_pids
;
202 /* Trivial list manipulation functions to keep track of a list of new
203 stopped processes. */
206 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
208 struct simple_pid_list
*new_pid
= xmalloc (sizeof (struct simple_pid_list
));
211 new_pid
->status
= status
;
212 new_pid
->next
= *listp
;
217 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
219 struct simple_pid_list
**p
;
221 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
222 if ((*p
)->pid
== pid
)
224 struct simple_pid_list
*next
= (*p
)->next
;
226 *statusp
= (*p
)->status
;
234 enum stopping_threads_kind
236 /* Not stopping threads presently. */
237 NOT_STOPPING_THREADS
,
239 /* Stopping threads. */
242 /* Stopping and suspending threads. */
243 STOPPING_AND_SUSPENDING_THREADS
246 /* This is set while stop_all_lwps is in effect. */
247 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
249 /* FIXME make into a target method? */
250 int using_threads
= 1;
252 /* True if we're presently stabilizing threads (moving them out of
254 static int stabilizing_threads
;
256 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
257 int step
, int signal
, siginfo_t
*info
);
258 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
259 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
260 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
261 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
262 int *wstat
, int options
);
263 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
264 static struct lwp_info
*add_lwp (ptid_t ptid
);
265 static int linux_stopped_by_watchpoint (void);
266 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
267 static void proceed_all_lwps (void);
268 static int finish_step_over (struct lwp_info
*lwp
);
269 static int kill_lwp (unsigned long lwpid
, int signo
);
271 /* When the event-loop is doing a step-over, this points at the thread
273 ptid_t step_over_bkpt
;
275 /* True if the low target can hardware single-step. Such targets
276 don't need a BREAKPOINT_REINSERT_ADDR callback. */
279 can_hardware_single_step (void)
281 return (the_low_target
.breakpoint_reinsert_addr
== NULL
);
284 /* True if the low target supports memory breakpoints. If so, we'll
285 have a GET_PC implementation. */
288 supports_breakpoints (void)
290 return (the_low_target
.get_pc
!= NULL
);
293 /* Returns true if this target can support fast tracepoints. This
294 does not mean that the in-process agent has been loaded in the
298 supports_fast_tracepoints (void)
300 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
303 /* True if LWP is stopped in its stepping range. */
306 lwp_in_step_range (struct lwp_info
*lwp
)
308 CORE_ADDR pc
= lwp
->stop_pc
;
310 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
313 struct pending_signals
317 struct pending_signals
*prev
;
320 /* The read/write ends of the pipe registered as waitable file in the
322 static int linux_event_pipe
[2] = { -1, -1 };
324 /* True if we're currently in async mode. */
325 #define target_is_async_p() (linux_event_pipe[0] != -1)
327 static void send_sigstop (struct lwp_info
*lwp
);
328 static void wait_for_sigstop (void);
330 /* Return non-zero if HEADER is a 64-bit ELF file. */
333 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
335 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
336 && header
->e_ident
[EI_MAG1
] == ELFMAG1
337 && header
->e_ident
[EI_MAG2
] == ELFMAG2
338 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
340 *machine
= header
->e_machine
;
341 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
348 /* Return non-zero if FILE is a 64-bit ELF file,
349 zero if the file is not a 64-bit ELF file,
350 and -1 if the file is not accessible or doesn't exist. */
353 elf_64_file_p (const char *file
, unsigned int *machine
)
358 fd
= open (file
, O_RDONLY
);
362 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
369 return elf_64_header_p (&header
, machine
);
372 /* Accepts an integer PID; Returns true if the executable PID is
373 running is a 64-bit ELF file.. */
376 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
380 sprintf (file
, "/proc/%d/exe", pid
);
381 return elf_64_file_p (file
, machine
);
385 delete_lwp (struct lwp_info
*lwp
)
387 struct thread_info
*thr
= get_lwp_thread (lwp
);
390 debug_printf ("deleting %ld\n", lwpid_of (thr
));
393 free (lwp
->arch_private
);
397 /* Add a process to the common process list, and set its private
400 static struct process_info
*
401 linux_add_process (int pid
, int attached
)
403 struct process_info
*proc
;
405 proc
= add_process (pid
, attached
);
406 proc
->priv
= xcalloc (1, sizeof (*proc
->priv
));
408 /* Set the arch when the first LWP stops. */
409 proc
->priv
->new_inferior
= 1;
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 parent_proc
= get_thread_process (event_thr
);
490 child_proc
->attached
= parent_proc
->attached
;
491 clone_all_breakpoints (&child_proc
->breakpoints
,
492 &child_proc
->raw_breakpoints
,
493 parent_proc
->breakpoints
);
495 tdesc
= xmalloc (sizeof (struct target_desc
));
496 copy_target_description (tdesc
, parent_proc
->tdesc
);
497 child_proc
->tdesc
= tdesc
;
499 /* Clone arch-specific process data. */
500 if (the_low_target
.new_fork
!= NULL
)
501 the_low_target
.new_fork (parent_proc
, child_proc
);
503 /* Save fork info in the parent thread. */
504 if (event
== PTRACE_EVENT_FORK
)
505 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
506 else if (event
== PTRACE_EVENT_VFORK
)
507 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
509 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
511 /* The status_pending field contains bits denoting the
512 extended event, so when the pending event is handled,
513 the handler will look at lwp->waitstatus. */
514 event_lwp
->status_pending_p
= 1;
515 event_lwp
->status_pending
= wstat
;
517 /* Report the event. */
522 debug_printf ("HEW: Got clone event "
523 "from LWP %ld, new child is LWP %ld\n",
524 lwpid_of (event_thr
), new_pid
);
526 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
527 new_lwp
= add_lwp (ptid
);
529 /* Either we're going to immediately resume the new thread
530 or leave it stopped. linux_resume_one_lwp is a nop if it
531 thinks the thread is currently running, so set this first
532 before calling linux_resume_one_lwp. */
533 new_lwp
->stopped
= 1;
535 /* If we're suspending all threads, leave this one suspended
537 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
)
538 new_lwp
->suspended
= 1;
540 /* Normally we will get the pending SIGSTOP. But in some cases
541 we might get another signal delivered to the group first.
542 If we do get another signal, be sure not to lose it. */
543 if (WSTOPSIG (status
) != SIGSTOP
)
545 new_lwp
->stop_expected
= 1;
546 new_lwp
->status_pending_p
= 1;
547 new_lwp
->status_pending
= status
;
550 /* Don't report the event. */
553 else if (event
== PTRACE_EVENT_VFORK_DONE
)
555 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
557 /* Report the event. */
561 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
564 /* Return the PC as read from the regcache of LWP, without any
568 get_pc (struct lwp_info
*lwp
)
570 struct thread_info
*saved_thread
;
571 struct regcache
*regcache
;
574 if (the_low_target
.get_pc
== NULL
)
577 saved_thread
= current_thread
;
578 current_thread
= get_lwp_thread (lwp
);
580 regcache
= get_thread_regcache (current_thread
, 1);
581 pc
= (*the_low_target
.get_pc
) (regcache
);
584 debug_printf ("pc is 0x%lx\n", (long) pc
);
586 current_thread
= saved_thread
;
590 /* This function should only be called if LWP got a SIGTRAP.
591 The SIGTRAP could mean several things.
593 On i386, where decr_pc_after_break is non-zero:
595 If we were single-stepping this process using PTRACE_SINGLESTEP, we
596 will get only the one SIGTRAP. The value of $eip will be the next
597 instruction. If the instruction we stepped over was a breakpoint,
598 we need to decrement the PC.
600 If we continue the process using PTRACE_CONT, we will get a
601 SIGTRAP when we hit a breakpoint. The value of $eip will be
602 the instruction after the breakpoint (i.e. needs to be
603 decremented). If we report the SIGTRAP to GDB, we must also
604 report the undecremented PC. If the breakpoint is removed, we
605 must resume at the decremented PC.
607 On a non-decr_pc_after_break machine with hardware or kernel
610 If we either single-step a breakpoint instruction, or continue and
611 hit a breakpoint instruction, our PC will point at the breakpoint
615 check_stopped_by_breakpoint (struct lwp_info
*lwp
)
618 CORE_ADDR sw_breakpoint_pc
;
619 struct thread_info
*saved_thread
;
620 #if USE_SIGTRAP_SIGINFO
624 if (the_low_target
.get_pc
== NULL
)
628 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
630 /* breakpoint_at reads from the current thread. */
631 saved_thread
= current_thread
;
632 current_thread
= get_lwp_thread (lwp
);
634 #if USE_SIGTRAP_SIGINFO
635 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
636 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
638 if (siginfo
.si_signo
== SIGTRAP
)
640 if (siginfo
.si_code
== GDB_ARCH_TRAP_BRKPT
)
644 struct thread_info
*thr
= get_lwp_thread (lwp
);
646 debug_printf ("CSBB: %s stopped by software breakpoint\n",
647 target_pid_to_str (ptid_of (thr
)));
650 /* Back up the PC if necessary. */
651 if (pc
!= sw_breakpoint_pc
)
653 struct regcache
*regcache
654 = get_thread_regcache (current_thread
, 1);
655 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
658 lwp
->stop_pc
= sw_breakpoint_pc
;
659 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
660 current_thread
= saved_thread
;
663 else if (siginfo
.si_code
== TRAP_HWBKPT
)
667 struct thread_info
*thr
= get_lwp_thread (lwp
);
669 debug_printf ("CSBB: %s stopped by hardware "
670 "breakpoint/watchpoint\n",
671 target_pid_to_str (ptid_of (thr
)));
675 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
676 current_thread
= saved_thread
;
679 else if (siginfo
.si_code
== TRAP_TRACE
)
683 struct thread_info
*thr
= get_lwp_thread (lwp
);
685 debug_printf ("CSBB: %s stopped by trace\n",
686 target_pid_to_str (ptid_of (thr
)));
692 /* We may have just stepped a breakpoint instruction. E.g., in
693 non-stop mode, GDB first tells the thread A to step a range, and
694 then the user inserts a breakpoint inside the range. In that
695 case we need to report the breakpoint PC. */
696 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
697 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
701 struct thread_info
*thr
= get_lwp_thread (lwp
);
703 debug_printf ("CSBB: %s stopped by software breakpoint\n",
704 target_pid_to_str (ptid_of (thr
)));
707 /* Back up the PC if necessary. */
708 if (pc
!= sw_breakpoint_pc
)
710 struct regcache
*regcache
711 = get_thread_regcache (current_thread
, 1);
712 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
715 lwp
->stop_pc
= sw_breakpoint_pc
;
716 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
717 current_thread
= saved_thread
;
721 if (hardware_breakpoint_inserted_here (pc
))
725 struct thread_info
*thr
= get_lwp_thread (lwp
);
727 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
728 target_pid_to_str (ptid_of (thr
)));
732 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
733 current_thread
= saved_thread
;
738 current_thread
= saved_thread
;
742 static struct lwp_info
*
743 add_lwp (ptid_t ptid
)
745 struct lwp_info
*lwp
;
747 lwp
= (struct lwp_info
*) xmalloc (sizeof (*lwp
));
748 memset (lwp
, 0, sizeof (*lwp
));
750 if (the_low_target
.new_thread
!= NULL
)
751 the_low_target
.new_thread (lwp
);
753 lwp
->thread
= add_thread (ptid
, lwp
);
758 /* Start an inferior process and returns its pid.
759 ALLARGS is a vector of program-name and args. */
762 linux_create_inferior (char *program
, char **allargs
)
764 struct lwp_info
*new_lwp
;
767 struct cleanup
*restore_personality
768 = maybe_disable_address_space_randomization (disable_randomization
);
770 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
776 perror_with_name ("fork");
781 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
783 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
784 signal (__SIGRTMIN
+ 1, SIG_DFL
);
789 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
790 stdout to stderr so that inferior i/o doesn't corrupt the connection.
791 Also, redirect stdin to /dev/null. */
792 if (remote_connection_is_stdio ())
795 open ("/dev/null", O_RDONLY
);
797 if (write (2, "stdin/stdout redirected\n",
798 sizeof ("stdin/stdout redirected\n") - 1) < 0)
800 /* Errors ignored. */;
804 execv (program
, allargs
);
806 execvp (program
, allargs
);
808 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
814 do_cleanups (restore_personality
);
816 linux_add_process (pid
, 0);
818 ptid
= ptid_build (pid
, pid
, 0);
819 new_lwp
= add_lwp (ptid
);
820 new_lwp
->must_set_ptrace_flags
= 1;
825 /* Attach to an inferior process. Returns 0 on success, ERRNO on
829 linux_attach_lwp (ptid_t ptid
)
831 struct lwp_info
*new_lwp
;
832 int lwpid
= ptid_get_lwp (ptid
);
834 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
838 new_lwp
= add_lwp (ptid
);
840 /* We need to wait for SIGSTOP before being able to make the next
841 ptrace call on this LWP. */
842 new_lwp
->must_set_ptrace_flags
= 1;
844 if (linux_proc_pid_is_stopped (lwpid
))
847 debug_printf ("Attached to a stopped process\n");
849 /* The process is definitely stopped. It is in a job control
850 stop, unless the kernel predates the TASK_STOPPED /
851 TASK_TRACED distinction, in which case it might be in a
852 ptrace stop. Make sure it is in a ptrace stop; from there we
853 can kill it, signal it, et cetera.
855 First make sure there is a pending SIGSTOP. Since we are
856 already attached, the process can not transition from stopped
857 to running without a PTRACE_CONT; so we know this signal will
858 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
859 probably already in the queue (unless this kernel is old
860 enough to use TASK_STOPPED for ptrace stops); but since
861 SIGSTOP is not an RT signal, it can only be queued once. */
862 kill_lwp (lwpid
, SIGSTOP
);
864 /* Finally, resume the stopped process. This will deliver the
865 SIGSTOP (or a higher priority signal, just like normal
866 PTRACE_ATTACH), which we'll catch later on. */
867 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
870 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
873 There are several cases to consider here:
875 1) gdbserver has already attached to the process and is being notified
876 of a new thread that is being created.
877 In this case we should ignore that SIGSTOP and resume the
878 process. This is handled below by setting stop_expected = 1,
879 and the fact that add_thread sets last_resume_kind ==
882 2) This is the first thread (the process thread), and we're attaching
883 to it via attach_inferior.
884 In this case we want the process thread to stop.
885 This is handled by having linux_attach set last_resume_kind ==
886 resume_stop after we return.
888 If the pid we are attaching to is also the tgid, we attach to and
889 stop all the existing threads. Otherwise, we attach to pid and
890 ignore any other threads in the same group as this pid.
892 3) GDB is connecting to gdbserver and is requesting an enumeration of all
894 In this case we want the thread to stop.
895 FIXME: This case is currently not properly handled.
896 We should wait for the SIGSTOP but don't. Things work apparently
897 because enough time passes between when we ptrace (ATTACH) and when
898 gdb makes the next ptrace call on the thread.
900 On the other hand, if we are currently trying to stop all threads, we
901 should treat the new thread as if we had sent it a SIGSTOP. This works
902 because we are guaranteed that the add_lwp call above added us to the
903 end of the list, and so the new thread has not yet reached
904 wait_for_sigstop (but will). */
905 new_lwp
->stop_expected
= 1;
910 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
911 already attached. Returns true if a new LWP is found, false
915 attach_proc_task_lwp_callback (ptid_t ptid
)
917 /* Is this a new thread? */
918 if (find_thread_ptid (ptid
) == NULL
)
920 int lwpid
= ptid_get_lwp (ptid
);
924 debug_printf ("Found new lwp %d\n", lwpid
);
926 err
= linux_attach_lwp (ptid
);
928 /* Be quiet if we simply raced with the thread exiting. EPERM
929 is returned if the thread's task still exists, and is marked
930 as exited or zombie, as well as other conditions, so in that
931 case, confirm the status in /proc/PID/status. */
933 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
937 debug_printf ("Cannot attach to lwp %d: "
938 "thread is gone (%d: %s)\n",
939 lwpid
, err
, strerror (err
));
944 warning (_("Cannot attach to lwp %d: %s"),
946 linux_ptrace_attach_fail_reason_string (ptid
, err
));
954 /* Attach to PID. If PID is the tgid, attach to it and all
958 linux_attach (unsigned long pid
)
960 ptid_t ptid
= ptid_build (pid
, pid
, 0);
963 /* Attach to PID. We will check for other threads
965 err
= linux_attach_lwp (ptid
);
967 error ("Cannot attach to process %ld: %s",
968 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
970 linux_add_process (pid
, 1);
974 struct thread_info
*thread
;
976 /* Don't ignore the initial SIGSTOP if we just attached to this
977 process. It will be collected by wait shortly. */
978 thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
979 thread
->last_resume_kind
= resume_stop
;
982 /* We must attach to every LWP. If /proc is mounted, use that to
983 find them now. On the one hand, the inferior may be using raw
984 clone instead of using pthreads. On the other hand, even if it
985 is using pthreads, GDB may not be connected yet (thread_db needs
986 to do symbol lookups, through qSymbol). Also, thread_db walks
987 structures in the inferior's address space to find the list of
988 threads/LWPs, and those structures may well be corrupted. Note
989 that once thread_db is loaded, we'll still use it to list threads
990 and associate pthread info with each LWP. */
991 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1002 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
1004 struct counter
*counter
= args
;
1006 if (ptid_get_pid (entry
->id
) == counter
->pid
)
1008 if (++counter
->count
> 1)
1016 last_thread_of_process_p (int pid
)
1018 struct counter counter
= { pid
, 0 };
1020 return (find_inferior (&all_threads
,
1021 second_thread_of_pid_p
, &counter
) == NULL
);
1027 linux_kill_one_lwp (struct lwp_info
*lwp
)
1029 struct thread_info
*thr
= get_lwp_thread (lwp
);
1030 int pid
= lwpid_of (thr
);
1032 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1033 there is no signal context, and ptrace(PTRACE_KILL) (or
1034 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1035 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1036 alternative is to kill with SIGKILL. We only need one SIGKILL
1037 per process, not one for each thread. But since we still support
1038 linuxthreads, and we also support debugging programs using raw
1039 clone without CLONE_THREAD, we send one for each thread. For
1040 years, we used PTRACE_KILL only, so we're being a bit paranoid
1041 about some old kernels where PTRACE_KILL might work better
1042 (dubious if there are any such, but that's why it's paranoia), so
1043 we try SIGKILL first, PTRACE_KILL second, and so we're fine
1047 kill_lwp (pid
, SIGKILL
);
1050 int save_errno
= errno
;
1052 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1053 target_pid_to_str (ptid_of (thr
)),
1054 save_errno
? strerror (save_errno
) : "OK");
1058 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1061 int save_errno
= errno
;
1063 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1064 target_pid_to_str (ptid_of (thr
)),
1065 save_errno
? strerror (save_errno
) : "OK");
1069 /* Kill LWP and wait for it to die. */
1072 kill_wait_lwp (struct lwp_info
*lwp
)
1074 struct thread_info
*thr
= get_lwp_thread (lwp
);
1075 int pid
= ptid_get_pid (ptid_of (thr
));
1076 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1081 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1085 linux_kill_one_lwp (lwp
);
1087 /* Make sure it died. Notes:
1089 - The loop is most likely unnecessary.
1091 - We don't use linux_wait_for_event as that could delete lwps
1092 while we're iterating over them. We're not interested in
1093 any pending status at this point, only in making sure all
1094 wait status on the kernel side are collected until the
1097 - We don't use __WALL here as the __WALL emulation relies on
1098 SIGCHLD, and killing a stopped process doesn't generate
1099 one, nor an exit status.
1101 res
= my_waitpid (lwpid
, &wstat
, 0);
1102 if (res
== -1 && errno
== ECHILD
)
1103 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1104 } while (res
> 0 && WIFSTOPPED (wstat
));
1106 /* Even if it was stopped, the child may have already disappeared.
1107 E.g., if it was killed by SIGKILL. */
1108 if (res
< 0 && errno
!= ECHILD
)
1109 perror_with_name ("kill_wait_lwp");
1112 /* Callback for `find_inferior'. Kills an lwp of a given process,
1113 except the leader. */
1116 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1118 struct thread_info
*thread
= (struct thread_info
*) entry
;
1119 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1120 int pid
= * (int *) args
;
1122 if (ptid_get_pid (entry
->id
) != pid
)
1125 /* We avoid killing the first thread here, because of a Linux kernel (at
1126 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1127 the children get a chance to be reaped, it will remain a zombie
1130 if (lwpid_of (thread
) == pid
)
1133 debug_printf ("lkop: is last of process %s\n",
1134 target_pid_to_str (entry
->id
));
1138 kill_wait_lwp (lwp
);
1143 linux_kill (int pid
)
1145 struct process_info
*process
;
1146 struct lwp_info
*lwp
;
1148 process
= find_process_pid (pid
);
1149 if (process
== NULL
)
1152 /* If we're killing a running inferior, make sure it is stopped
1153 first, as PTRACE_KILL will not work otherwise. */
1154 stop_all_lwps (0, NULL
);
1156 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1158 /* See the comment in linux_kill_one_lwp. We did not kill the first
1159 thread in the list, so do so now. */
1160 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1165 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1169 kill_wait_lwp (lwp
);
1171 the_target
->mourn (process
);
1173 /* Since we presently can only stop all lwps of all processes, we
1174 need to unstop lwps of other processes. */
1175 unstop_all_lwps (0, NULL
);
1179 /* Get pending signal of THREAD, for detaching purposes. This is the
1180 signal the thread last stopped for, which we need to deliver to the
1181 thread when detaching, otherwise, it'd be suppressed/lost. */
1184 get_detach_signal (struct thread_info
*thread
)
1186 enum gdb_signal signo
= GDB_SIGNAL_0
;
1188 struct lwp_info
*lp
= get_thread_lwp (thread
);
1190 if (lp
->status_pending_p
)
1191 status
= lp
->status_pending
;
1194 /* If the thread had been suspended by gdbserver, and it stopped
1195 cleanly, then it'll have stopped with SIGSTOP. But we don't
1196 want to deliver that SIGSTOP. */
1197 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1198 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1201 /* Otherwise, we may need to deliver the signal we
1203 status
= lp
->last_status
;
1206 if (!WIFSTOPPED (status
))
1209 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1210 target_pid_to_str (ptid_of (thread
)));
1214 /* Extended wait statuses aren't real SIGTRAPs. */
1215 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1218 debug_printf ("GPS: lwp %s had stopped with extended "
1219 "status: no pending signal\n",
1220 target_pid_to_str (ptid_of (thread
)));
1224 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1226 if (program_signals_p
&& !program_signals
[signo
])
1229 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1230 target_pid_to_str (ptid_of (thread
)),
1231 gdb_signal_to_string (signo
));
1234 else if (!program_signals_p
1235 /* If we have no way to know which signals GDB does not
1236 want to have passed to the program, assume
1237 SIGTRAP/SIGINT, which is GDB's default. */
1238 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1241 debug_printf ("GPS: lwp %s had signal %s, "
1242 "but we don't know if we should pass it. "
1243 "Default to not.\n",
1244 target_pid_to_str (ptid_of (thread
)),
1245 gdb_signal_to_string (signo
));
1251 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1252 target_pid_to_str (ptid_of (thread
)),
1253 gdb_signal_to_string (signo
));
1255 return WSTOPSIG (status
);
1260 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
1262 struct thread_info
*thread
= (struct thread_info
*) entry
;
1263 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1264 int pid
= * (int *) args
;
1267 if (ptid_get_pid (entry
->id
) != pid
)
1270 /* If there is a pending SIGSTOP, get rid of it. */
1271 if (lwp
->stop_expected
)
1274 debug_printf ("Sending SIGCONT to %s\n",
1275 target_pid_to_str (ptid_of (thread
)));
1277 kill_lwp (lwpid_of (thread
), SIGCONT
);
1278 lwp
->stop_expected
= 0;
1281 /* Flush any pending changes to the process's registers. */
1282 regcache_invalidate_thread (thread
);
1284 /* Pass on any pending signal for this thread. */
1285 sig
= get_detach_signal (thread
);
1287 /* Finally, let it resume. */
1288 if (the_low_target
.prepare_to_resume
!= NULL
)
1289 the_low_target
.prepare_to_resume (lwp
);
1290 if (ptrace (PTRACE_DETACH
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1291 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1292 error (_("Can't detach %s: %s"),
1293 target_pid_to_str (ptid_of (thread
)),
1301 linux_detach (int pid
)
1303 struct process_info
*process
;
1305 process
= find_process_pid (pid
);
1306 if (process
== NULL
)
1309 /* Stop all threads before detaching. First, ptrace requires that
1310 the thread is stopped to sucessfully detach. Second, thread_db
1311 may need to uninstall thread event breakpoints from memory, which
1312 only works with a stopped process anyway. */
1313 stop_all_lwps (0, NULL
);
1315 #ifdef USE_THREAD_DB
1316 thread_db_detach (process
);
1319 /* Stabilize threads (move out of jump pads). */
1320 stabilize_threads ();
1322 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
1324 the_target
->mourn (process
);
1326 /* Since we presently can only stop all lwps of all processes, we
1327 need to unstop lwps of other processes. */
1328 unstop_all_lwps (0, NULL
);
1332 /* Remove all LWPs that belong to process PROC from the lwp list. */
1335 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1337 struct thread_info
*thread
= (struct thread_info
*) entry
;
1338 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1339 struct process_info
*process
= proc
;
1341 if (pid_of (thread
) == pid_of (process
))
1348 linux_mourn (struct process_info
*process
)
1350 struct process_info_private
*priv
;
1352 #ifdef USE_THREAD_DB
1353 thread_db_mourn (process
);
1356 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1358 /* Freeing all private data. */
1359 priv
= process
->priv
;
1360 free (priv
->arch_private
);
1362 process
->priv
= NULL
;
1364 remove_process (process
);
1368 linux_join (int pid
)
1373 ret
= my_waitpid (pid
, &status
, 0);
1374 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1376 } while (ret
!= -1 || errno
!= ECHILD
);
1379 /* Return nonzero if the given thread is still alive. */
1381 linux_thread_alive (ptid_t ptid
)
1383 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1385 /* We assume we always know if a thread exits. If a whole process
1386 exited but we still haven't been able to report it to GDB, we'll
1387 hold on to the last lwp of the dead process. */
1394 /* Return 1 if this lwp still has an interesting status pending. If
1395 not (e.g., it had stopped for a breakpoint that is gone), return
1399 thread_still_has_status_pending_p (struct thread_info
*thread
)
1401 struct lwp_info
*lp
= get_thread_lwp (thread
);
1403 if (!lp
->status_pending_p
)
1406 /* If we got a `vCont;t', but we haven't reported a stop yet, do
1407 report any status pending the LWP may have. */
1408 if (thread
->last_resume_kind
== resume_stop
1409 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
1412 if (thread
->last_resume_kind
!= resume_stop
1413 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1414 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1416 struct thread_info
*saved_thread
;
1420 gdb_assert (lp
->last_status
!= 0);
1424 saved_thread
= current_thread
;
1425 current_thread
= thread
;
1427 if (pc
!= lp
->stop_pc
)
1430 debug_printf ("PC of %ld changed\n",
1435 #if !USE_SIGTRAP_SIGINFO
1436 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1437 && !(*the_low_target
.breakpoint_at
) (pc
))
1440 debug_printf ("previous SW breakpoint of %ld gone\n",
1444 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1445 && !hardware_breakpoint_inserted_here (pc
))
1448 debug_printf ("previous HW breakpoint of %ld gone\n",
1454 current_thread
= saved_thread
;
1459 debug_printf ("discarding pending breakpoint status\n");
1460 lp
->status_pending_p
= 0;
1468 /* Return 1 if this lwp has an interesting status pending. */
1470 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1472 struct thread_info
*thread
= (struct thread_info
*) entry
;
1473 struct lwp_info
*lp
= get_thread_lwp (thread
);
1474 ptid_t ptid
= * (ptid_t
*) arg
;
1476 /* Check if we're only interested in events from a specific process
1477 or a specific LWP. */
1478 if (!ptid_match (ptid_of (thread
), ptid
))
1481 if (lp
->status_pending_p
1482 && !thread_still_has_status_pending_p (thread
))
1484 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1488 return lp
->status_pending_p
;
1492 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1494 ptid_t ptid
= *(ptid_t
*) data
;
1497 if (ptid_get_lwp (ptid
) != 0)
1498 lwp
= ptid_get_lwp (ptid
);
1500 lwp
= ptid_get_pid (ptid
);
1502 if (ptid_get_lwp (entry
->id
) == lwp
)
1509 find_lwp_pid (ptid_t ptid
)
1511 struct inferior_list_entry
*thread
1512 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1517 return get_thread_lwp ((struct thread_info
*) thread
);
1520 /* Return the number of known LWPs in the tgid given by PID. */
1525 struct inferior_list_entry
*inf
, *tmp
;
1528 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1530 if (ptid_get_pid (inf
->id
) == pid
)
1537 /* The arguments passed to iterate_over_lwps. */
1539 struct iterate_over_lwps_args
1541 /* The FILTER argument passed to iterate_over_lwps. */
1544 /* The CALLBACK argument passed to iterate_over_lwps. */
1545 iterate_over_lwps_ftype
*callback
;
1547 /* The DATA argument passed to iterate_over_lwps. */
1551 /* Callback for find_inferior used by iterate_over_lwps to filter
1552 calls to the callback supplied to that function. Returning a
1553 nonzero value causes find_inferiors to stop iterating and return
1554 the current inferior_list_entry. Returning zero indicates that
1555 find_inferiors should continue iterating. */
1558 iterate_over_lwps_filter (struct inferior_list_entry
*entry
, void *args_p
)
1560 struct iterate_over_lwps_args
*args
1561 = (struct iterate_over_lwps_args
*) args_p
;
1563 if (ptid_match (entry
->id
, args
->filter
))
1565 struct thread_info
*thr
= (struct thread_info
*) entry
;
1566 struct lwp_info
*lwp
= get_thread_lwp (thr
);
1568 return (*args
->callback
) (lwp
, args
->data
);
1574 /* See nat/linux-nat.h. */
1577 iterate_over_lwps (ptid_t filter
,
1578 iterate_over_lwps_ftype callback
,
1581 struct iterate_over_lwps_args args
= {filter
, callback
, data
};
1582 struct inferior_list_entry
*entry
;
1584 entry
= find_inferior (&all_threads
, iterate_over_lwps_filter
, &args
);
1588 return get_thread_lwp ((struct thread_info
*) entry
);
1591 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1592 their exits until all other threads in the group have exited. */
1595 check_zombie_leaders (void)
1597 struct process_info
*proc
, *tmp
;
1599 ALL_PROCESSES (proc
, tmp
)
1601 pid_t leader_pid
= pid_of (proc
);
1602 struct lwp_info
*leader_lp
;
1604 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1607 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1608 "num_lwps=%d, zombie=%d\n",
1609 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1610 linux_proc_pid_is_zombie (leader_pid
));
1612 if (leader_lp
!= NULL
1613 /* Check if there are other threads in the group, as we may
1614 have raced with the inferior simply exiting. */
1615 && !last_thread_of_process_p (leader_pid
)
1616 && linux_proc_pid_is_zombie (leader_pid
))
1618 /* A leader zombie can mean one of two things:
1620 - It exited, and there's an exit status pending
1621 available, or only the leader exited (not the whole
1622 program). In the latter case, we can't waitpid the
1623 leader's exit status until all other threads are gone.
1625 - There are 3 or more threads in the group, and a thread
1626 other than the leader exec'd. On an exec, the Linux
1627 kernel destroys all other threads (except the execing
1628 one) in the thread group, and resets the execing thread's
1629 tid to the tgid. No exit notification is sent for the
1630 execing thread -- from the ptracer's perspective, it
1631 appears as though the execing thread just vanishes.
1632 Until we reap all other threads except the leader and the
1633 execing thread, the leader will be zombie, and the
1634 execing thread will be in `D (disc sleep)'. As soon as
1635 all other threads are reaped, the execing thread changes
1636 it's tid to the tgid, and the previous (zombie) leader
1637 vanishes, giving place to the "new" leader. We could try
1638 distinguishing the exit and exec cases, by waiting once
1639 more, and seeing if something comes out, but it doesn't
1640 sound useful. The previous leader _does_ go away, and
1641 we'll re-add the new one once we see the exec event
1642 (which is just the same as what would happen if the
1643 previous leader did exit voluntarily before some other
1648 "CZL: Thread group leader %d zombie "
1649 "(it exited, or another thread execd).\n",
1652 delete_lwp (leader_lp
);
1657 /* Callback for `find_inferior'. Returns the first LWP that is not
1658 stopped. ARG is a PTID filter. */
1661 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
1663 struct thread_info
*thr
= (struct thread_info
*) entry
;
1664 struct lwp_info
*lwp
;
1665 ptid_t filter
= *(ptid_t
*) arg
;
1667 if (!ptid_match (ptid_of (thr
), filter
))
1670 lwp
= get_thread_lwp (thr
);
1677 /* This function should only be called if the LWP got a SIGTRAP.
1679 Handle any tracepoint steps or hits. Return true if a tracepoint
1680 event was handled, 0 otherwise. */
1683 handle_tracepoints (struct lwp_info
*lwp
)
1685 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1686 int tpoint_related_event
= 0;
1688 gdb_assert (lwp
->suspended
== 0);
1690 /* If this tracepoint hit causes a tracing stop, we'll immediately
1691 uninsert tracepoints. To do this, we temporarily pause all
1692 threads, unpatch away, and then unpause threads. We need to make
1693 sure the unpausing doesn't resume LWP too. */
1696 /* And we need to be sure that any all-threads-stopping doesn't try
1697 to move threads out of the jump pads, as it could deadlock the
1698 inferior (LWP could be in the jump pad, maybe even holding the
1701 /* Do any necessary step collect actions. */
1702 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1704 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1706 /* See if we just hit a tracepoint and do its main collect
1708 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1712 gdb_assert (lwp
->suspended
== 0);
1713 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
1715 if (tpoint_related_event
)
1718 debug_printf ("got a tracepoint event\n");
1725 /* Convenience wrapper. Returns true if LWP is presently collecting a
1729 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
1730 struct fast_tpoint_collect_status
*status
)
1732 CORE_ADDR thread_area
;
1733 struct thread_info
*thread
= get_lwp_thread (lwp
);
1735 if (the_low_target
.get_thread_area
== NULL
)
1738 /* Get the thread area address. This is used to recognize which
1739 thread is which when tracing with the in-process agent library.
1740 We don't read anything from the address, and treat it as opaque;
1741 it's the address itself that we assume is unique per-thread. */
1742 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
1745 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1748 /* The reason we resume in the caller, is because we want to be able
1749 to pass lwp->status_pending as WSTAT, and we need to clear
1750 status_pending_p before resuming, otherwise, linux_resume_one_lwp
1751 refuses to resume. */
1754 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
1756 struct thread_info
*saved_thread
;
1758 saved_thread
= current_thread
;
1759 current_thread
= get_lwp_thread (lwp
);
1762 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
1763 && supports_fast_tracepoints ()
1764 && agent_loaded_p ())
1766 struct fast_tpoint_collect_status status
;
1770 debug_printf ("Checking whether LWP %ld needs to move out of the "
1772 lwpid_of (current_thread
));
1774 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
1777 || (WSTOPSIG (*wstat
) != SIGILL
1778 && WSTOPSIG (*wstat
) != SIGFPE
1779 && WSTOPSIG (*wstat
) != SIGSEGV
1780 && WSTOPSIG (*wstat
) != SIGBUS
))
1782 lwp
->collecting_fast_tracepoint
= r
;
1786 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
1788 /* Haven't executed the original instruction yet.
1789 Set breakpoint there, and wait till it's hit,
1790 then single-step until exiting the jump pad. */
1791 lwp
->exit_jump_pad_bkpt
1792 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
1796 debug_printf ("Checking whether LWP %ld needs to move out of "
1797 "the jump pad...it does\n",
1798 lwpid_of (current_thread
));
1799 current_thread
= saved_thread
;
1806 /* If we get a synchronous signal while collecting, *and*
1807 while executing the (relocated) original instruction,
1808 reset the PC to point at the tpoint address, before
1809 reporting to GDB. Otherwise, it's an IPA lib bug: just
1810 report the signal to GDB, and pray for the best. */
1812 lwp
->collecting_fast_tracepoint
= 0;
1815 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
1816 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
1819 struct regcache
*regcache
;
1821 /* The si_addr on a few signals references the address
1822 of the faulting instruction. Adjust that as
1824 if ((WSTOPSIG (*wstat
) == SIGILL
1825 || WSTOPSIG (*wstat
) == SIGFPE
1826 || WSTOPSIG (*wstat
) == SIGBUS
1827 || WSTOPSIG (*wstat
) == SIGSEGV
)
1828 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
1829 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
1830 /* Final check just to make sure we don't clobber
1831 the siginfo of non-kernel-sent signals. */
1832 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
1834 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
1835 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
1836 (PTRACE_TYPE_ARG3
) 0, &info
);
1839 regcache
= get_thread_regcache (current_thread
, 1);
1840 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
1841 lwp
->stop_pc
= status
.tpoint_addr
;
1843 /* Cancel any fast tracepoint lock this thread was
1845 force_unlock_trace_buffer ();
1848 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
1851 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
1852 "stopping all threads momentarily.\n");
1854 stop_all_lwps (1, lwp
);
1856 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
1857 lwp
->exit_jump_pad_bkpt
= NULL
;
1859 unstop_all_lwps (1, lwp
);
1861 gdb_assert (lwp
->suspended
>= 0);
1867 debug_printf ("Checking whether LWP %ld needs to move out of the "
1869 lwpid_of (current_thread
));
1871 current_thread
= saved_thread
;
1875 /* Enqueue one signal in the "signals to report later when out of the
1879 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1881 struct pending_signals
*p_sig
;
1882 struct thread_info
*thread
= get_lwp_thread (lwp
);
1885 debug_printf ("Deferring signal %d for LWP %ld.\n",
1886 WSTOPSIG (*wstat
), lwpid_of (thread
));
1890 struct pending_signals
*sig
;
1892 for (sig
= lwp
->pending_signals_to_report
;
1895 debug_printf (" Already queued %d\n",
1898 debug_printf (" (no more currently queued signals)\n");
1901 /* Don't enqueue non-RT signals if they are already in the deferred
1902 queue. (SIGSTOP being the easiest signal to see ending up here
1904 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
1906 struct pending_signals
*sig
;
1908 for (sig
= lwp
->pending_signals_to_report
;
1912 if (sig
->signal
== WSTOPSIG (*wstat
))
1915 debug_printf ("Not requeuing already queued non-RT signal %d"
1924 p_sig
= xmalloc (sizeof (*p_sig
));
1925 p_sig
->prev
= lwp
->pending_signals_to_report
;
1926 p_sig
->signal
= WSTOPSIG (*wstat
);
1927 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
1928 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1931 lwp
->pending_signals_to_report
= p_sig
;
1934 /* Dequeue one signal from the "signals to report later when out of
1935 the jump pad" list. */
1938 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1940 struct thread_info
*thread
= get_lwp_thread (lwp
);
1942 if (lwp
->pending_signals_to_report
!= NULL
)
1944 struct pending_signals
**p_sig
;
1946 p_sig
= &lwp
->pending_signals_to_report
;
1947 while ((*p_sig
)->prev
!= NULL
)
1948 p_sig
= &(*p_sig
)->prev
;
1950 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
1951 if ((*p_sig
)->info
.si_signo
!= 0)
1952 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1958 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
1959 WSTOPSIG (*wstat
), lwpid_of (thread
));
1963 struct pending_signals
*sig
;
1965 for (sig
= lwp
->pending_signals_to_report
;
1968 debug_printf (" Still queued %d\n",
1971 debug_printf (" (no more queued signals)\n");
1980 /* Fetch the possibly triggered data watchpoint info and store it in
1983 On some archs, like x86, that use debug registers to set
1984 watchpoints, it's possible that the way to know which watched
1985 address trapped, is to check the register that is used to select
1986 which address to watch. Problem is, between setting the watchpoint
1987 and reading back which data address trapped, the user may change
1988 the set of watchpoints, and, as a consequence, GDB changes the
1989 debug registers in the inferior. To avoid reading back a stale
1990 stopped-data-address when that happens, we cache in LP the fact
1991 that a watchpoint trapped, and the corresponding data address, as
1992 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
1993 registers meanwhile, we have the cached data we can rely on. */
1996 check_stopped_by_watchpoint (struct lwp_info
*child
)
1998 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2000 struct thread_info
*saved_thread
;
2002 saved_thread
= current_thread
;
2003 current_thread
= get_lwp_thread (child
);
2005 if (the_low_target
.stopped_by_watchpoint ())
2007 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2009 if (the_low_target
.stopped_data_address
!= NULL
)
2010 child
->stopped_data_address
2011 = the_low_target
.stopped_data_address ();
2013 child
->stopped_data_address
= 0;
2016 current_thread
= saved_thread
;
2019 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2022 /* Return the ptrace options that we want to try to enable. */
2025 linux_low_ptrace_options (int attached
)
2030 options
|= PTRACE_O_EXITKILL
;
2032 if (report_fork_events
)
2033 options
|= PTRACE_O_TRACEFORK
;
2035 if (report_vfork_events
)
2036 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2041 /* Do low-level handling of the event, and check if we should go on
2042 and pass it to caller code. Return the affected lwp if we are, or
2045 static struct lwp_info
*
2046 linux_low_filter_event (int lwpid
, int wstat
)
2048 struct lwp_info
*child
;
2049 struct thread_info
*thread
;
2050 int have_stop_pc
= 0;
2052 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2054 /* If we didn't find a process, one of two things presumably happened:
2055 - A process we started and then detached from has exited. Ignore it.
2056 - A process we are controlling has forked and the new child's stop
2057 was reported to us by the kernel. Save its PID. */
2058 if (child
== NULL
&& WIFSTOPPED (wstat
))
2060 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2063 else if (child
== NULL
)
2066 thread
= get_lwp_thread (child
);
2070 child
->last_status
= wstat
;
2072 /* Check if the thread has exited. */
2073 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2076 debug_printf ("LLFE: %d exited.\n", lwpid
);
2077 if (num_lwps (pid_of (thread
)) > 1)
2080 /* If there is at least one more LWP, then the exit signal was
2081 not the end of the debugged application and should be
2088 /* This was the last lwp in the process. Since events are
2089 serialized to GDB core, and we can't report this one
2090 right now, but GDB core and the other target layers will
2091 want to be notified about the exit code/signal, leave the
2092 status pending for the next time we're able to report
2094 mark_lwp_dead (child
, wstat
);
2099 gdb_assert (WIFSTOPPED (wstat
));
2101 if (WIFSTOPPED (wstat
))
2103 struct process_info
*proc
;
2105 /* Architecture-specific setup after inferior is running. This
2106 needs to happen after we have attached to the inferior and it
2107 is stopped for the first time, but before we access any
2108 inferior registers. */
2109 proc
= find_process_pid (pid_of (thread
));
2110 if (proc
->priv
->new_inferior
)
2112 struct thread_info
*saved_thread
;
2114 saved_thread
= current_thread
;
2115 current_thread
= thread
;
2117 the_low_target
.arch_setup ();
2119 current_thread
= saved_thread
;
2121 proc
->priv
->new_inferior
= 0;
2125 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2127 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2128 int options
= linux_low_ptrace_options (proc
->attached
);
2130 linux_enable_event_reporting (lwpid
, options
);
2131 child
->must_set_ptrace_flags
= 0;
2134 /* Be careful to not overwrite stop_pc until
2135 check_stopped_by_breakpoint is called. */
2136 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2137 && linux_is_extended_waitstatus (wstat
))
2139 child
->stop_pc
= get_pc (child
);
2140 if (handle_extended_wait (child
, wstat
))
2142 /* The event has been handled, so just return without
2148 /* Check first whether this was a SW/HW breakpoint before checking
2149 watchpoints, because at least s390 can't tell the data address of
2150 hardware watchpoint hits, and returns stopped-by-watchpoint as
2151 long as there's a watchpoint set. */
2152 if (WIFSTOPPED (wstat
) && linux_wstatus_maybe_breakpoint (wstat
))
2154 if (check_stopped_by_breakpoint (child
))
2158 /* Note that TRAP_HWBKPT can indicate either a hardware breakpoint
2159 or hardware watchpoint. Check which is which if we got
2160 TARGET_STOPPED_BY_HW_BREAKPOINT. */
2161 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2162 && (child
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
2163 || child
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
2164 check_stopped_by_watchpoint (child
);
2167 child
->stop_pc
= get_pc (child
);
2169 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2170 && child
->stop_expected
)
2173 debug_printf ("Expected stop.\n");
2174 child
->stop_expected
= 0;
2176 if (thread
->last_resume_kind
== resume_stop
)
2178 /* We want to report the stop to the core. Treat the
2179 SIGSTOP as a normal event. */
2181 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2182 target_pid_to_str (ptid_of (thread
)));
2184 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2186 /* Stopping threads. We don't want this SIGSTOP to end up
2189 debug_printf ("LLW: SIGSTOP caught for %s "
2190 "while stopping threads.\n",
2191 target_pid_to_str (ptid_of (thread
)));
2196 /* This is a delayed SIGSTOP. Filter out the event. */
2198 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2199 child
->stepping
? "step" : "continue",
2200 target_pid_to_str (ptid_of (thread
)));
2202 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2207 child
->status_pending_p
= 1;
2208 child
->status_pending
= wstat
;
2212 /* Resume LWPs that are currently stopped without any pending status
2213 to report, but are resumed from the core's perspective. */
2216 resume_stopped_resumed_lwps (struct inferior_list_entry
*entry
)
2218 struct thread_info
*thread
= (struct thread_info
*) entry
;
2219 struct lwp_info
*lp
= get_thread_lwp (thread
);
2222 && !lp
->status_pending_p
2223 && thread
->last_resume_kind
!= resume_stop
2224 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2226 int step
= thread
->last_resume_kind
== resume_step
;
2229 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2230 target_pid_to_str (ptid_of (thread
)),
2231 paddress (lp
->stop_pc
),
2234 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2238 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2239 match FILTER_PTID (leaving others pending). The PTIDs can be:
2240 minus_one_ptid, to specify any child; a pid PTID, specifying all
2241 lwps of a thread group; or a PTID representing a single lwp. Store
2242 the stop status through the status pointer WSTAT. OPTIONS is
2243 passed to the waitpid call. Return 0 if no event was found and
2244 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2245 was found. Return the PID of the stopped child otherwise. */
2248 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2249 int *wstatp
, int options
)
2251 struct thread_info
*event_thread
;
2252 struct lwp_info
*event_child
, *requested_child
;
2253 sigset_t block_mask
, prev_mask
;
2256 /* N.B. event_thread points to the thread_info struct that contains
2257 event_child. Keep them in sync. */
2258 event_thread
= NULL
;
2260 requested_child
= NULL
;
2262 /* Check for a lwp with a pending status. */
2264 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2266 event_thread
= (struct thread_info
*)
2267 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2268 if (event_thread
!= NULL
)
2269 event_child
= get_thread_lwp (event_thread
);
2270 if (debug_threads
&& event_thread
)
2271 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2273 else if (!ptid_equal (filter_ptid
, null_ptid
))
2275 requested_child
= find_lwp_pid (filter_ptid
);
2277 if (stopping_threads
== NOT_STOPPING_THREADS
2278 && requested_child
->status_pending_p
2279 && requested_child
->collecting_fast_tracepoint
)
2281 enqueue_one_deferred_signal (requested_child
,
2282 &requested_child
->status_pending
);
2283 requested_child
->status_pending_p
= 0;
2284 requested_child
->status_pending
= 0;
2285 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2288 if (requested_child
->suspended
2289 && requested_child
->status_pending_p
)
2291 internal_error (__FILE__
, __LINE__
,
2292 "requesting an event out of a"
2293 " suspended child?");
2296 if (requested_child
->status_pending_p
)
2298 event_child
= requested_child
;
2299 event_thread
= get_lwp_thread (event_child
);
2303 if (event_child
!= NULL
)
2306 debug_printf ("Got an event from pending child %ld (%04x)\n",
2307 lwpid_of (event_thread
), event_child
->status_pending
);
2308 *wstatp
= event_child
->status_pending
;
2309 event_child
->status_pending_p
= 0;
2310 event_child
->status_pending
= 0;
2311 current_thread
= event_thread
;
2312 return lwpid_of (event_thread
);
2315 /* But if we don't find a pending event, we'll have to wait.
2317 We only enter this loop if no process has a pending wait status.
2318 Thus any action taken in response to a wait status inside this
2319 loop is responding as soon as we detect the status, not after any
2322 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2323 all signals while here. */
2324 sigfillset (&block_mask
);
2325 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2327 /* Always pull all events out of the kernel. We'll randomly select
2328 an event LWP out of all that have events, to prevent
2330 while (event_child
== NULL
)
2334 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2337 - If the thread group leader exits while other threads in the
2338 thread group still exist, waitpid(TGID, ...) hangs. That
2339 waitpid won't return an exit status until the other threads
2340 in the group are reaped.
2342 - When a non-leader thread execs, that thread just vanishes
2343 without reporting an exit (so we'd hang if we waited for it
2344 explicitly in that case). The exec event is reported to
2345 the TGID pid (although we don't currently enable exec
2348 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2351 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2352 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2358 debug_printf ("LLW: waitpid %ld received %s\n",
2359 (long) ret
, status_to_str (*wstatp
));
2362 /* Filter all events. IOW, leave all events pending. We'll
2363 randomly select an event LWP out of all that have events
2365 linux_low_filter_event (ret
, *wstatp
);
2366 /* Retry until nothing comes out of waitpid. A single
2367 SIGCHLD can indicate more than one child stopped. */
2371 /* Now that we've pulled all events out of the kernel, resume
2372 LWPs that don't have an interesting event to report. */
2373 if (stopping_threads
== NOT_STOPPING_THREADS
)
2374 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2376 /* ... and find an LWP with a status to report to the core, if
2378 event_thread
= (struct thread_info
*)
2379 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2380 if (event_thread
!= NULL
)
2382 event_child
= get_thread_lwp (event_thread
);
2383 *wstatp
= event_child
->status_pending
;
2384 event_child
->status_pending_p
= 0;
2385 event_child
->status_pending
= 0;
2389 /* Check for zombie thread group leaders. Those can't be reaped
2390 until all other threads in the thread group are. */
2391 check_zombie_leaders ();
2393 /* If there are no resumed children left in the set of LWPs we
2394 want to wait for, bail. We can't just block in
2395 waitpid/sigsuspend, because lwps might have been left stopped
2396 in trace-stop state, and we'd be stuck forever waiting for
2397 their status to change (which would only happen if we resumed
2398 them). Even if WNOHANG is set, this return code is preferred
2399 over 0 (below), as it is more detailed. */
2400 if ((find_inferior (&all_threads
,
2401 not_stopped_callback
,
2402 &wait_ptid
) == NULL
))
2405 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2406 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2410 /* No interesting event to report to the caller. */
2411 if ((options
& WNOHANG
))
2414 debug_printf ("WNOHANG set, no event found\n");
2416 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2420 /* Block until we get an event reported with SIGCHLD. */
2422 debug_printf ("sigsuspend'ing\n");
2424 sigsuspend (&prev_mask
);
2425 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2429 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2431 current_thread
= event_thread
;
2433 /* Check for thread exit. */
2434 if (! WIFSTOPPED (*wstatp
))
2436 gdb_assert (last_thread_of_process_p (pid_of (event_thread
)));
2439 debug_printf ("LWP %d is the last lwp of process. "
2440 "Process %ld exiting.\n",
2441 pid_of (event_thread
), lwpid_of (event_thread
));
2442 return lwpid_of (event_thread
);
2445 return lwpid_of (event_thread
);
2448 /* Wait for an event from child(ren) PTID. PTIDs can be:
2449 minus_one_ptid, to specify any child; a pid PTID, specifying all
2450 lwps of a thread group; or a PTID representing a single lwp. Store
2451 the stop status through the status pointer WSTAT. OPTIONS is
2452 passed to the waitpid call. Return 0 if no event was found and
2453 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2454 was found. Return the PID of the stopped child otherwise. */
2457 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2459 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2462 /* Count the LWP's that have had events. */
2465 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2467 struct thread_info
*thread
= (struct thread_info
*) entry
;
2468 struct lwp_info
*lp
= get_thread_lwp (thread
);
2471 gdb_assert (count
!= NULL
);
2473 /* Count only resumed LWPs that have an event pending. */
2474 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2475 && lp
->status_pending_p
)
2481 /* Select the LWP (if any) that is currently being single-stepped. */
2484 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2486 struct thread_info
*thread
= (struct thread_info
*) entry
;
2487 struct lwp_info
*lp
= get_thread_lwp (thread
);
2489 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2490 && thread
->last_resume_kind
== resume_step
2491 && lp
->status_pending_p
)
2497 /* Select the Nth LWP that has had an event. */
2500 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2502 struct thread_info
*thread
= (struct thread_info
*) entry
;
2503 struct lwp_info
*lp
= get_thread_lwp (thread
);
2504 int *selector
= data
;
2506 gdb_assert (selector
!= NULL
);
2508 /* Select only resumed LWPs that have an event pending. */
2509 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2510 && lp
->status_pending_p
)
2511 if ((*selector
)-- == 0)
2517 /* Select one LWP out of those that have events pending. */
2520 select_event_lwp (struct lwp_info
**orig_lp
)
2523 int random_selector
;
2524 struct thread_info
*event_thread
= NULL
;
2526 /* In all-stop, give preference to the LWP that is being
2527 single-stepped. There will be at most one, and it's the LWP that
2528 the core is most interested in. If we didn't do this, then we'd
2529 have to handle pending step SIGTRAPs somehow in case the core
2530 later continues the previously-stepped thread, otherwise we'd
2531 report the pending SIGTRAP, and the core, not having stepped the
2532 thread, wouldn't understand what the trap was for, and therefore
2533 would report it to the user as a random signal. */
2537 = (struct thread_info
*) find_inferior (&all_threads
,
2538 select_singlestep_lwp_callback
,
2540 if (event_thread
!= NULL
)
2543 debug_printf ("SEL: Select single-step %s\n",
2544 target_pid_to_str (ptid_of (event_thread
)));
2547 if (event_thread
== NULL
)
2549 /* No single-stepping LWP. Select one at random, out of those
2550 which have had events. */
2552 /* First see how many events we have. */
2553 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2554 gdb_assert (num_events
> 0);
2556 /* Now randomly pick a LWP out of those that have had
2558 random_selector
= (int)
2559 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2561 if (debug_threads
&& num_events
> 1)
2562 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2563 num_events
, random_selector
);
2566 = (struct thread_info
*) find_inferior (&all_threads
,
2567 select_event_lwp_callback
,
2571 if (event_thread
!= NULL
)
2573 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2575 /* Switch the event LWP. */
2576 *orig_lp
= event_lp
;
2580 /* Decrement the suspend count of an LWP. */
2583 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2585 struct thread_info
*thread
= (struct thread_info
*) entry
;
2586 struct lwp_info
*lwp
= get_thread_lwp (thread
);
2588 /* Ignore EXCEPT. */
2594 gdb_assert (lwp
->suspended
>= 0);
2598 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2602 unsuspend_all_lwps (struct lwp_info
*except
)
2604 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
2607 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
2608 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
2610 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
2611 static ptid_t
linux_wait_1 (ptid_t ptid
,
2612 struct target_waitstatus
*ourstatus
,
2613 int target_options
);
2615 /* Stabilize threads (move out of jump pads).
2617 If a thread is midway collecting a fast tracepoint, we need to
2618 finish the collection and move it out of the jump pad before
2619 reporting the signal.
2621 This avoids recursion while collecting (when a signal arrives
2622 midway, and the signal handler itself collects), which would trash
2623 the trace buffer. In case the user set a breakpoint in a signal
2624 handler, this avoids the backtrace showing the jump pad, etc..
2625 Most importantly, there are certain things we can't do safely if
2626 threads are stopped in a jump pad (or in its callee's). For
2629 - starting a new trace run. A thread still collecting the
2630 previous run, could trash the trace buffer when resumed. The trace
2631 buffer control structures would have been reset but the thread had
2632 no way to tell. The thread could even midway memcpy'ing to the
2633 buffer, which would mean that when resumed, it would clobber the
2634 trace buffer that had been set for a new run.
2636 - we can't rewrite/reuse the jump pads for new tracepoints
2637 safely. Say you do tstart while a thread is stopped midway while
2638 collecting. When the thread is later resumed, it finishes the
2639 collection, and returns to the jump pad, to execute the original
2640 instruction that was under the tracepoint jump at the time the
2641 older run had been started. If the jump pad had been rewritten
2642 since for something else in the new run, the thread would now
2643 execute the wrong / random instructions. */
2646 linux_stabilize_threads (void)
2648 struct thread_info
*saved_thread
;
2649 struct thread_info
*thread_stuck
;
2652 = (struct thread_info
*) find_inferior (&all_threads
,
2653 stuck_in_jump_pad_callback
,
2655 if (thread_stuck
!= NULL
)
2658 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2659 lwpid_of (thread_stuck
));
2663 saved_thread
= current_thread
;
2665 stabilizing_threads
= 1;
2668 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
2670 /* Loop until all are stopped out of the jump pads. */
2671 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
2673 struct target_waitstatus ourstatus
;
2674 struct lwp_info
*lwp
;
2677 /* Note that we go through the full wait even loop. While
2678 moving threads out of jump pad, we need to be able to step
2679 over internal breakpoints and such. */
2680 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2682 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2684 lwp
= get_thread_lwp (current_thread
);
2689 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
2690 || current_thread
->last_resume_kind
== resume_stop
)
2692 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
2693 enqueue_one_deferred_signal (lwp
, &wstat
);
2698 find_inferior (&all_threads
, unsuspend_one_lwp
, NULL
);
2700 stabilizing_threads
= 0;
2702 current_thread
= saved_thread
;
2707 = (struct thread_info
*) find_inferior (&all_threads
,
2708 stuck_in_jump_pad_callback
,
2710 if (thread_stuck
!= NULL
)
2711 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
2712 lwpid_of (thread_stuck
));
2716 static void async_file_mark (void);
2718 /* Convenience function that is called when the kernel reports an
2719 event that is not passed out to GDB. */
2722 ignore_event (struct target_waitstatus
*ourstatus
)
2724 /* If we got an event, there may still be others, as a single
2725 SIGCHLD can indicate more than one child stopped. This forces
2726 another target_wait call. */
2729 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2733 /* Return non-zero if WAITSTATUS reflects an extended linux
2734 event. Otherwise, return zero. */
2737 extended_event_reported (const struct target_waitstatus
*waitstatus
)
2739 if (waitstatus
== NULL
)
2742 return (waitstatus
->kind
== TARGET_WAITKIND_FORKED
2743 || waitstatus
->kind
== TARGET_WAITKIND_VFORKED
2744 || waitstatus
->kind
== TARGET_WAITKIND_VFORK_DONE
);
2747 /* Wait for process, returns status. */
2750 linux_wait_1 (ptid_t ptid
,
2751 struct target_waitstatus
*ourstatus
, int target_options
)
2754 struct lwp_info
*event_child
;
2757 int step_over_finished
;
2758 int bp_explains_trap
;
2759 int maybe_internal_trap
;
2767 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
2770 /* Translate generic target options into linux options. */
2772 if (target_options
& TARGET_WNOHANG
)
2775 bp_explains_trap
= 0;
2778 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2780 if (ptid_equal (step_over_bkpt
, null_ptid
))
2781 pid
= linux_wait_for_event (ptid
, &w
, options
);
2785 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
2786 target_pid_to_str (step_over_bkpt
));
2787 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
2792 gdb_assert (target_options
& TARGET_WNOHANG
);
2796 debug_printf ("linux_wait_1 ret = null_ptid, "
2797 "TARGET_WAITKIND_IGNORE\n");
2801 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2808 debug_printf ("linux_wait_1 ret = null_ptid, "
2809 "TARGET_WAITKIND_NO_RESUMED\n");
2813 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
2817 event_child
= get_thread_lwp (current_thread
);
2819 /* linux_wait_for_event only returns an exit status for the last
2820 child of a process. Report it. */
2821 if (WIFEXITED (w
) || WIFSIGNALED (w
))
2825 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
2826 ourstatus
->value
.integer
= WEXITSTATUS (w
);
2830 debug_printf ("linux_wait_1 ret = %s, exited with "
2832 target_pid_to_str (ptid_of (current_thread
)),
2839 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
2840 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
2844 debug_printf ("linux_wait_1 ret = %s, terminated with "
2846 target_pid_to_str (ptid_of (current_thread
)),
2852 return ptid_of (current_thread
);
2855 /* If step-over executes a breakpoint instruction, it means a
2856 gdb/gdbserver breakpoint had been planted on top of a permanent
2857 breakpoint. The PC has been adjusted by
2858 check_stopped_by_breakpoint to point at the breakpoint address.
2859 Advance the PC manually past the breakpoint, otherwise the
2860 program would keep trapping the permanent breakpoint forever. */
2861 if (!ptid_equal (step_over_bkpt
, null_ptid
)
2862 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
2864 unsigned int increment_pc
= the_low_target
.breakpoint_len
;
2868 debug_printf ("step-over for %s executed software breakpoint\n",
2869 target_pid_to_str (ptid_of (current_thread
)));
2872 if (increment_pc
!= 0)
2874 struct regcache
*regcache
2875 = get_thread_regcache (current_thread
, 1);
2877 event_child
->stop_pc
+= increment_pc
;
2878 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
2880 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
2881 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
2885 /* If this event was not handled before, and is not a SIGTRAP, we
2886 report it. SIGILL and SIGSEGV are also treated as traps in case
2887 a breakpoint is inserted at the current PC. If this target does
2888 not support internal breakpoints at all, we also report the
2889 SIGTRAP without further processing; it's of no concern to us. */
2891 = (supports_breakpoints ()
2892 && (WSTOPSIG (w
) == SIGTRAP
2893 || ((WSTOPSIG (w
) == SIGILL
2894 || WSTOPSIG (w
) == SIGSEGV
)
2895 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
2897 if (maybe_internal_trap
)
2899 /* Handle anything that requires bookkeeping before deciding to
2900 report the event or continue waiting. */
2902 /* First check if we can explain the SIGTRAP with an internal
2903 breakpoint, or if we should possibly report the event to GDB.
2904 Do this before anything that may remove or insert a
2906 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
2908 /* We have a SIGTRAP, possibly a step-over dance has just
2909 finished. If so, tweak the state machine accordingly,
2910 reinsert breakpoints and delete any reinsert (software
2911 single-step) breakpoints. */
2912 step_over_finished
= finish_step_over (event_child
);
2914 /* Now invoke the callbacks of any internal breakpoints there. */
2915 check_breakpoints (event_child
->stop_pc
);
2917 /* Handle tracepoint data collecting. This may overflow the
2918 trace buffer, and cause a tracing stop, removing
2920 trace_event
= handle_tracepoints (event_child
);
2922 if (bp_explains_trap
)
2924 /* If we stepped or ran into an internal breakpoint, we've
2925 already handled it. So next time we resume (from this
2926 PC), we should step over it. */
2928 debug_printf ("Hit a gdbserver breakpoint.\n");
2930 if (breakpoint_here (event_child
->stop_pc
))
2931 event_child
->need_step_over
= 1;
2936 /* We have some other signal, possibly a step-over dance was in
2937 progress, and it should be cancelled too. */
2938 step_over_finished
= finish_step_over (event_child
);
2941 /* We have all the data we need. Either report the event to GDB, or
2942 resume threads and keep waiting for more. */
2944 /* If we're collecting a fast tracepoint, finish the collection and
2945 move out of the jump pad before delivering a signal. See
2946 linux_stabilize_threads. */
2949 && WSTOPSIG (w
) != SIGTRAP
2950 && supports_fast_tracepoints ()
2951 && agent_loaded_p ())
2954 debug_printf ("Got signal %d for LWP %ld. Check if we need "
2955 "to defer or adjust it.\n",
2956 WSTOPSIG (w
), lwpid_of (current_thread
));
2958 /* Allow debugging the jump pad itself. */
2959 if (current_thread
->last_resume_kind
!= resume_step
2960 && maybe_move_out_of_jump_pad (event_child
, &w
))
2962 enqueue_one_deferred_signal (event_child
, &w
);
2965 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
2966 WSTOPSIG (w
), lwpid_of (current_thread
));
2968 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
2970 return ignore_event (ourstatus
);
2974 if (event_child
->collecting_fast_tracepoint
)
2977 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
2978 "Check if we're already there.\n",
2979 lwpid_of (current_thread
),
2980 event_child
->collecting_fast_tracepoint
);
2984 event_child
->collecting_fast_tracepoint
2985 = linux_fast_tracepoint_collecting (event_child
, NULL
);
2987 if (event_child
->collecting_fast_tracepoint
!= 1)
2989 /* No longer need this breakpoint. */
2990 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
2993 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
2994 "stopping all threads momentarily.\n");
2996 /* Other running threads could hit this breakpoint.
2997 We don't handle moribund locations like GDB does,
2998 instead we always pause all threads when removing
2999 breakpoints, so that any step-over or
3000 decr_pc_after_break adjustment is always taken
3001 care of while the breakpoint is still
3003 stop_all_lwps (1, event_child
);
3005 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3006 event_child
->exit_jump_pad_bkpt
= NULL
;
3008 unstop_all_lwps (1, event_child
);
3010 gdb_assert (event_child
->suspended
>= 0);
3014 if (event_child
->collecting_fast_tracepoint
== 0)
3017 debug_printf ("fast tracepoint finished "
3018 "collecting successfully.\n");
3020 /* We may have a deferred signal to report. */
3021 if (dequeue_one_deferred_signal (event_child
, &w
))
3024 debug_printf ("dequeued one signal.\n");
3029 debug_printf ("no deferred signals.\n");
3031 if (stabilizing_threads
)
3033 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3034 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3038 debug_printf ("linux_wait_1 ret = %s, stopped "
3039 "while stabilizing threads\n",
3040 target_pid_to_str (ptid_of (current_thread
)));
3044 return ptid_of (current_thread
);
3050 /* Check whether GDB would be interested in this event. */
3052 /* If GDB is not interested in this signal, don't stop other
3053 threads, and don't report it to GDB. Just resume the inferior
3054 right away. We do this for threading-related signals as well as
3055 any that GDB specifically requested we ignore. But never ignore
3056 SIGSTOP if we sent it ourselves, and do not ignore signals when
3057 stepping - they may require special handling to skip the signal
3058 handler. Also never ignore signals that could be caused by a
3060 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
3063 && current_thread
->last_resume_kind
!= resume_step
3065 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3066 (current_process ()->priv
->thread_db
!= NULL
3067 && (WSTOPSIG (w
) == __SIGRTMIN
3068 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3071 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3072 && !(WSTOPSIG (w
) == SIGSTOP
3073 && current_thread
->last_resume_kind
== resume_stop
)
3074 && !linux_wstatus_maybe_breakpoint (w
))))
3076 siginfo_t info
, *info_p
;
3079 debug_printf ("Ignored signal %d for LWP %ld.\n",
3080 WSTOPSIG (w
), lwpid_of (current_thread
));
3082 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3083 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3087 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3088 WSTOPSIG (w
), info_p
);
3089 return ignore_event (ourstatus
);
3092 /* Note that all addresses are always "out of the step range" when
3093 there's no range to begin with. */
3094 in_step_range
= lwp_in_step_range (event_child
);
3096 /* If GDB wanted this thread to single step, and the thread is out
3097 of the step range, we always want to report the SIGTRAP, and let
3098 GDB handle it. Watchpoints should always be reported. So should
3099 signals we can't explain. A SIGTRAP we can't explain could be a
3100 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3101 do, we're be able to handle GDB breakpoints on top of internal
3102 breakpoints, by handling the internal breakpoint and still
3103 reporting the event to GDB. If we don't, we're out of luck, GDB
3104 won't see the breakpoint hit. */
3105 report_to_gdb
= (!maybe_internal_trap
3106 || (current_thread
->last_resume_kind
== resume_step
3108 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3109 || (!step_over_finished
&& !in_step_range
3110 && !bp_explains_trap
&& !trace_event
)
3111 || (gdb_breakpoint_here (event_child
->stop_pc
)
3112 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3113 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3114 || extended_event_reported (&event_child
->waitstatus
));
3116 run_breakpoint_commands (event_child
->stop_pc
);
3118 /* We found no reason GDB would want us to stop. We either hit one
3119 of our own breakpoints, or finished an internal step GDB
3120 shouldn't know about. */
3125 if (bp_explains_trap
)
3126 debug_printf ("Hit a gdbserver breakpoint.\n");
3127 if (step_over_finished
)
3128 debug_printf ("Step-over finished.\n");
3130 debug_printf ("Tracepoint event.\n");
3131 if (lwp_in_step_range (event_child
))
3132 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3133 paddress (event_child
->stop_pc
),
3134 paddress (event_child
->step_range_start
),
3135 paddress (event_child
->step_range_end
));
3136 if (extended_event_reported (&event_child
->waitstatus
))
3138 char *str
= target_waitstatus_to_string (ourstatus
);
3139 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3140 lwpid_of (get_lwp_thread (event_child
)), str
);
3145 /* We're not reporting this breakpoint to GDB, so apply the
3146 decr_pc_after_break adjustment to the inferior's regcache
3149 if (the_low_target
.set_pc
!= NULL
)
3151 struct regcache
*regcache
3152 = get_thread_regcache (current_thread
, 1);
3153 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3156 /* We may have finished stepping over a breakpoint. If so,
3157 we've stopped and suspended all LWPs momentarily except the
3158 stepping one. This is where we resume them all again. We're
3159 going to keep waiting, so use proceed, which handles stepping
3160 over the next breakpoint. */
3162 debug_printf ("proceeding all threads.\n");
3164 if (step_over_finished
)
3165 unsuspend_all_lwps (event_child
);
3167 proceed_all_lwps ();
3168 return ignore_event (ourstatus
);
3173 if (current_thread
->last_resume_kind
== resume_step
)
3175 if (event_child
->step_range_start
== event_child
->step_range_end
)
3176 debug_printf ("GDB wanted to single-step, reporting event.\n");
3177 else if (!lwp_in_step_range (event_child
))
3178 debug_printf ("Out of step range, reporting event.\n");
3180 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3181 debug_printf ("Stopped by watchpoint.\n");
3182 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3183 debug_printf ("Stopped by GDB breakpoint.\n");
3185 debug_printf ("Hit a non-gdbserver trap event.\n");
3188 /* Alright, we're going to report a stop. */
3190 if (!stabilizing_threads
)
3192 /* In all-stop, stop all threads. */
3194 stop_all_lwps (0, NULL
);
3196 /* If we're not waiting for a specific LWP, choose an event LWP
3197 from among those that have had events. Giving equal priority
3198 to all LWPs that have had events helps prevent
3200 if (ptid_equal (ptid
, minus_one_ptid
))
3202 event_child
->status_pending_p
= 1;
3203 event_child
->status_pending
= w
;
3205 select_event_lwp (&event_child
);
3207 /* current_thread and event_child must stay in sync. */
3208 current_thread
= get_lwp_thread (event_child
);
3210 event_child
->status_pending_p
= 0;
3211 w
= event_child
->status_pending
;
3214 if (step_over_finished
)
3218 /* If we were doing a step-over, all other threads but
3219 the stepping one had been paused in start_step_over,
3220 with their suspend counts incremented. We don't want
3221 to do a full unstop/unpause, because we're in
3222 all-stop mode (so we want threads stopped), but we
3223 still need to unsuspend the other threads, to
3224 decrement their `suspended' count back. */
3225 unsuspend_all_lwps (event_child
);
3229 /* If we just finished a step-over, then all threads had
3230 been momentarily paused. In all-stop, that's fine,
3231 we want threads stopped by now anyway. In non-stop,
3232 we need to re-resume threads that GDB wanted to be
3234 unstop_all_lwps (1, event_child
);
3238 /* Stabilize threads (move out of jump pads). */
3240 stabilize_threads ();
3244 /* If we just finished a step-over, then all threads had been
3245 momentarily paused. In all-stop, that's fine, we want
3246 threads stopped by now anyway. In non-stop, we need to
3247 re-resume threads that GDB wanted to be running. */
3248 if (step_over_finished
)
3249 unstop_all_lwps (1, event_child
);
3252 if (extended_event_reported (&event_child
->waitstatus
))
3254 /* If the reported event is a fork, vfork or exec, let GDB know. */
3255 ourstatus
->kind
= event_child
->waitstatus
.kind
;
3256 ourstatus
->value
= event_child
->waitstatus
.value
;
3258 /* Clear the event lwp's waitstatus since we handled it already. */
3259 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3262 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3264 /* Now that we've selected our final event LWP, un-adjust its PC if
3265 it was a software breakpoint, and the client doesn't know we can
3266 adjust the breakpoint ourselves. */
3267 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3268 && !swbreak_feature
)
3270 int decr_pc
= the_low_target
.decr_pc_after_break
;
3274 struct regcache
*regcache
3275 = get_thread_regcache (current_thread
, 1);
3276 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3280 if (current_thread
->last_resume_kind
== resume_stop
3281 && WSTOPSIG (w
) == SIGSTOP
)
3283 /* A thread that has been requested to stop by GDB with vCont;t,
3284 and it stopped cleanly, so report as SIG0. The use of
3285 SIGSTOP is an implementation detail. */
3286 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3288 else if (current_thread
->last_resume_kind
== resume_stop
3289 && WSTOPSIG (w
) != SIGSTOP
)
3291 /* A thread that has been requested to stop by GDB with vCont;t,
3292 but, it stopped for other reasons. */
3293 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3295 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3297 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3300 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3304 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3305 target_pid_to_str (ptid_of (current_thread
)),
3306 ourstatus
->kind
, ourstatus
->value
.sig
);
3310 return ptid_of (current_thread
);
3313 /* Get rid of any pending event in the pipe. */
3315 async_file_flush (void)
3321 ret
= read (linux_event_pipe
[0], &buf
, 1);
3322 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3325 /* Put something in the pipe, so the event loop wakes up. */
3327 async_file_mark (void)
3331 async_file_flush ();
3334 ret
= write (linux_event_pipe
[1], "+", 1);
3335 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3337 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3338 be awakened anyway. */
3342 linux_wait (ptid_t ptid
,
3343 struct target_waitstatus
*ourstatus
, int target_options
)
3347 /* Flush the async file first. */
3348 if (target_is_async_p ())
3349 async_file_flush ();
3353 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3355 while ((target_options
& TARGET_WNOHANG
) == 0
3356 && ptid_equal (event_ptid
, null_ptid
)
3357 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3359 /* If at least one stop was reported, there may be more. A single
3360 SIGCHLD can signal more than one child stop. */
3361 if (target_is_async_p ()
3362 && (target_options
& TARGET_WNOHANG
) != 0
3363 && !ptid_equal (event_ptid
, null_ptid
))
3369 /* Send a signal to an LWP. */
3372 kill_lwp (unsigned long lwpid
, int signo
)
3374 /* Use tkill, if possible, in case we are using nptl threads. If tkill
3375 fails, then we are not using nptl threads and we should be using kill. */
3379 static int tkill_failed
;
3386 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3387 if (errno
!= ENOSYS
)
3394 return kill (lwpid
, signo
);
3398 linux_stop_lwp (struct lwp_info
*lwp
)
3404 send_sigstop (struct lwp_info
*lwp
)
3408 pid
= lwpid_of (get_lwp_thread (lwp
));
3410 /* If we already have a pending stop signal for this process, don't
3412 if (lwp
->stop_expected
)
3415 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3421 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3423 lwp
->stop_expected
= 1;
3424 kill_lwp (pid
, SIGSTOP
);
3428 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
3430 struct thread_info
*thread
= (struct thread_info
*) entry
;
3431 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3433 /* Ignore EXCEPT. */
3444 /* Increment the suspend count of an LWP, and stop it, if not stopped
3447 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
3450 struct thread_info
*thread
= (struct thread_info
*) entry
;
3451 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3453 /* Ignore EXCEPT. */
3459 return send_sigstop_callback (entry
, except
);
3463 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3465 /* It's dead, really. */
3468 /* Store the exit status for later. */
3469 lwp
->status_pending_p
= 1;
3470 lwp
->status_pending
= wstat
;
3472 /* Prevent trying to stop it. */
3475 /* No further stops are expected from a dead lwp. */
3476 lwp
->stop_expected
= 0;
3479 /* Wait for all children to stop for the SIGSTOPs we just queued. */
3482 wait_for_sigstop (void)
3484 struct thread_info
*saved_thread
;
3489 saved_thread
= current_thread
;
3490 if (saved_thread
!= NULL
)
3491 saved_tid
= saved_thread
->entry
.id
;
3493 saved_tid
= null_ptid
; /* avoid bogus unused warning */
3496 debug_printf ("wait_for_sigstop: pulling events\n");
3498 /* Passing NULL_PTID as filter indicates we want all events to be
3499 left pending. Eventually this returns when there are no
3500 unwaited-for children left. */
3501 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
3503 gdb_assert (ret
== -1);
3505 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
3506 current_thread
= saved_thread
;
3510 debug_printf ("Previously current thread died.\n");
3514 /* We can't change the current inferior behind GDB's back,
3515 otherwise, a subsequent command may apply to the wrong
3517 current_thread
= NULL
;
3521 /* Set a valid thread as current. */
3522 set_desired_thread (0);
3527 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
3528 move it out, because we need to report the stop event to GDB. For
3529 example, if the user puts a breakpoint in the jump pad, it's
3530 because she wants to debug it. */
3533 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
3535 struct thread_info
*thread
= (struct thread_info
*) entry
;
3536 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3538 gdb_assert (lwp
->suspended
== 0);
3539 gdb_assert (lwp
->stopped
);
3541 /* Allow debugging the jump pad, gdb_collect, etc.. */
3542 return (supports_fast_tracepoints ()
3543 && agent_loaded_p ()
3544 && (gdb_breakpoint_here (lwp
->stop_pc
)
3545 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3546 || thread
->last_resume_kind
== resume_step
)
3547 && linux_fast_tracepoint_collecting (lwp
, NULL
));
3551 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
3553 struct thread_info
*thread
= (struct thread_info
*) entry
;
3554 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3557 gdb_assert (lwp
->suspended
== 0);
3558 gdb_assert (lwp
->stopped
);
3560 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
3562 /* Allow debugging the jump pad, gdb_collect, etc. */
3563 if (!gdb_breakpoint_here (lwp
->stop_pc
)
3564 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
3565 && thread
->last_resume_kind
!= resume_step
3566 && maybe_move_out_of_jump_pad (lwp
, wstat
))
3569 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
3574 lwp
->status_pending_p
= 0;
3575 enqueue_one_deferred_signal (lwp
, wstat
);
3578 debug_printf ("Signal %d for LWP %ld deferred "
3580 WSTOPSIG (*wstat
), lwpid_of (thread
));
3583 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
3590 lwp_running (struct inferior_list_entry
*entry
, void *data
)
3592 struct thread_info
*thread
= (struct thread_info
*) entry
;
3593 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3602 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
3603 If SUSPEND, then also increase the suspend count of every LWP,
3607 stop_all_lwps (int suspend
, struct lwp_info
*except
)
3609 /* Should not be called recursively. */
3610 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
3615 debug_printf ("stop_all_lwps (%s, except=%s)\n",
3616 suspend
? "stop-and-suspend" : "stop",
3618 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
3622 stopping_threads
= (suspend
3623 ? STOPPING_AND_SUSPENDING_THREADS
3624 : STOPPING_THREADS
);
3627 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
3629 find_inferior (&all_threads
, send_sigstop_callback
, except
);
3630 wait_for_sigstop ();
3631 stopping_threads
= NOT_STOPPING_THREADS
;
3635 debug_printf ("stop_all_lwps done, setting stopping_threads "
3636 "back to !stopping\n");
3641 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
3642 SIGNAL is nonzero, give it that signal. */
3645 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
3646 int step
, int signal
, siginfo_t
*info
)
3648 struct thread_info
*thread
= get_lwp_thread (lwp
);
3649 struct thread_info
*saved_thread
;
3650 int fast_tp_collecting
;
3652 if (lwp
->stopped
== 0)
3655 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
3657 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
3659 /* Cancel actions that rely on GDB not changing the PC (e.g., the
3660 user used the "jump" command, or "set $pc = foo"). */
3661 if (lwp
->stop_pc
!= get_pc (lwp
))
3663 /* Collecting 'while-stepping' actions doesn't make sense
3665 release_while_stepping_state_list (thread
);
3668 /* If we have pending signals or status, and a new signal, enqueue the
3669 signal. Also enqueue the signal if we are waiting to reinsert a
3670 breakpoint; it will be picked up again below. */
3672 && (lwp
->status_pending_p
3673 || lwp
->pending_signals
!= NULL
3674 || lwp
->bp_reinsert
!= 0
3675 || fast_tp_collecting
))
3677 struct pending_signals
*p_sig
;
3678 p_sig
= xmalloc (sizeof (*p_sig
));
3679 p_sig
->prev
= lwp
->pending_signals
;
3680 p_sig
->signal
= signal
;
3682 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3684 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3685 lwp
->pending_signals
= p_sig
;
3688 if (lwp
->status_pending_p
)
3691 debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);"
3692 " has pending status\n",
3693 lwpid_of (thread
), step
? "step" : "continue", signal
,
3694 lwp
->stop_expected
? "expected" : "not expected");
3698 saved_thread
= current_thread
;
3699 current_thread
= thread
;
3702 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
3703 lwpid_of (thread
), step
? "step" : "continue", signal
,
3704 lwp
->stop_expected
? "expected" : "not expected");
3706 /* This bit needs some thinking about. If we get a signal that
3707 we must report while a single-step reinsert is still pending,
3708 we often end up resuming the thread. It might be better to
3709 (ew) allow a stack of pending events; then we could be sure that
3710 the reinsert happened right away and not lose any signals.
3712 Making this stack would also shrink the window in which breakpoints are
3713 uninserted (see comment in linux_wait_for_lwp) but not enough for
3714 complete correctness, so it won't solve that problem. It may be
3715 worthwhile just to solve this one, however. */
3716 if (lwp
->bp_reinsert
!= 0)
3719 debug_printf (" pending reinsert at 0x%s\n",
3720 paddress (lwp
->bp_reinsert
));
3722 if (can_hardware_single_step ())
3724 if (fast_tp_collecting
== 0)
3727 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
3729 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
3736 /* Postpone any pending signal. It was enqueued above. */
3740 if (fast_tp_collecting
== 1)
3743 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3744 " (exit-jump-pad-bkpt)\n",
3747 /* Postpone any pending signal. It was enqueued above. */
3750 else if (fast_tp_collecting
== 2)
3753 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3754 " single-stepping\n",
3757 if (can_hardware_single_step ())
3761 internal_error (__FILE__
, __LINE__
,
3762 "moving out of jump pad single-stepping"
3763 " not implemented on this target");
3766 /* Postpone any pending signal. It was enqueued above. */
3770 /* If we have while-stepping actions in this thread set it stepping.
3771 If we have a signal to deliver, it may or may not be set to
3772 SIG_IGN, we don't know. Assume so, and allow collecting
3773 while-stepping into a signal handler. A possible smart thing to
3774 do would be to set an internal breakpoint at the signal return
3775 address, continue, and carry on catching this while-stepping
3776 action only when that breakpoint is hit. A future
3778 if (thread
->while_stepping
!= NULL
3779 && can_hardware_single_step ())
3782 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
3787 if (the_low_target
.get_pc
!= NULL
)
3789 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
3791 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
3795 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
3796 (long) lwp
->stop_pc
);
3800 /* If we have pending signals, consume one unless we are trying to
3801 reinsert a breakpoint or we're trying to finish a fast tracepoint
3803 if (lwp
->pending_signals
!= NULL
3804 && lwp
->bp_reinsert
== 0
3805 && fast_tp_collecting
== 0)
3807 struct pending_signals
**p_sig
;
3809 p_sig
= &lwp
->pending_signals
;
3810 while ((*p_sig
)->prev
!= NULL
)
3811 p_sig
= &(*p_sig
)->prev
;
3813 signal
= (*p_sig
)->signal
;
3814 if ((*p_sig
)->info
.si_signo
!= 0)
3815 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3822 if (the_low_target
.prepare_to_resume
!= NULL
)
3823 the_low_target
.prepare_to_resume (lwp
);
3825 regcache_invalidate_thread (thread
);
3827 lwp
->stepping
= step
;
3828 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (thread
),
3829 (PTRACE_TYPE_ARG3
) 0,
3830 /* Coerce to a uintptr_t first to avoid potential gcc warning
3831 of coercing an 8 byte integer to a 4 byte pointer. */
3832 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
3834 current_thread
= saved_thread
;
3836 perror_with_name ("resuming thread");
3838 /* Successfully resumed. Clear state that no longer makes sense,
3839 and mark the LWP as running. Must not do this before resuming
3840 otherwise if that fails other code will be confused. E.g., we'd
3841 later try to stop the LWP and hang forever waiting for a stop
3842 status. Note that we must not throw after this is cleared,
3843 otherwise handle_zombie_lwp_error would get confused. */
3845 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3848 /* Called when we try to resume a stopped LWP and that errors out. If
3849 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
3850 or about to become), discard the error, clear any pending status
3851 the LWP may have, and return true (we'll collect the exit status
3852 soon enough). Otherwise, return false. */
3855 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
3857 struct thread_info
*thread
= get_lwp_thread (lp
);
3859 /* If we get an error after resuming the LWP successfully, we'd
3860 confuse !T state for the LWP being gone. */
3861 gdb_assert (lp
->stopped
);
3863 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
3864 because even if ptrace failed with ESRCH, the tracee may be "not
3865 yet fully dead", but already refusing ptrace requests. In that
3866 case the tracee has 'R (Running)' state for a little bit
3867 (observed in Linux 3.18). See also the note on ESRCH in the
3868 ptrace(2) man page. Instead, check whether the LWP has any state
3869 other than ptrace-stopped. */
3871 /* Don't assume anything if /proc/PID/status can't be read. */
3872 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
3874 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3875 lp
->status_pending_p
= 0;
3881 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
3882 disappears while we try to resume it. */
3885 linux_resume_one_lwp (struct lwp_info
*lwp
,
3886 int step
, int signal
, siginfo_t
*info
)
3890 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
3892 CATCH (ex
, RETURN_MASK_ERROR
)
3894 if (!check_ptrace_stopped_lwp_gone (lwp
))
3895 throw_exception (ex
);
3900 struct thread_resume_array
3902 struct thread_resume
*resume
;
3906 /* This function is called once per thread via find_inferior.
3907 ARG is a pointer to a thread_resume_array struct.
3908 We look up the thread specified by ENTRY in ARG, and mark the thread
3909 with a pointer to the appropriate resume request.
3911 This algorithm is O(threads * resume elements), but resume elements
3912 is small (and will remain small at least until GDB supports thread
3916 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
3918 struct thread_info
*thread
= (struct thread_info
*) entry
;
3919 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3921 struct thread_resume_array
*r
;
3925 for (ndx
= 0; ndx
< r
->n
; ndx
++)
3927 ptid_t ptid
= r
->resume
[ndx
].thread
;
3928 if (ptid_equal (ptid
, minus_one_ptid
)
3929 || ptid_equal (ptid
, entry
->id
)
3930 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
3932 || (ptid_get_pid (ptid
) == pid_of (thread
)
3933 && (ptid_is_pid (ptid
)
3934 || ptid_get_lwp (ptid
) == -1)))
3936 if (r
->resume
[ndx
].kind
== resume_stop
3937 && thread
->last_resume_kind
== resume_stop
)
3940 debug_printf ("already %s LWP %ld at GDB's request\n",
3941 (thread
->last_status
.kind
3942 == TARGET_WAITKIND_STOPPED
)
3950 lwp
->resume
= &r
->resume
[ndx
];
3951 thread
->last_resume_kind
= lwp
->resume
->kind
;
3953 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
3954 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
3956 /* If we had a deferred signal to report, dequeue one now.
3957 This can happen if LWP gets more than one signal while
3958 trying to get out of a jump pad. */
3960 && !lwp
->status_pending_p
3961 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
3963 lwp
->status_pending_p
= 1;
3966 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
3967 "leaving status pending.\n",
3968 WSTOPSIG (lwp
->status_pending
),
3976 /* No resume action for this thread. */
3982 /* find_inferior callback for linux_resume.
3983 Set *FLAG_P if this lwp has an interesting status pending. */
3986 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
3988 struct thread_info
*thread
= (struct thread_info
*) entry
;
3989 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3991 /* LWPs which will not be resumed are not interesting, because
3992 we might not wait for them next time through linux_wait. */
3993 if (lwp
->resume
== NULL
)
3996 if (thread_still_has_status_pending_p (thread
))
3997 * (int *) flag_p
= 1;
4002 /* Return 1 if this lwp that GDB wants running is stopped at an
4003 internal breakpoint that we need to step over. It assumes that any
4004 required STOP_PC adjustment has already been propagated to the
4005 inferior's regcache. */
4008 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
4010 struct thread_info
*thread
= (struct thread_info
*) entry
;
4011 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4012 struct thread_info
*saved_thread
;
4015 /* LWPs which will not be resumed are not interesting, because we
4016 might not wait for them next time through linux_wait. */
4021 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4026 if (thread
->last_resume_kind
== resume_stop
)
4029 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4035 gdb_assert (lwp
->suspended
>= 0);
4040 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4045 if (!lwp
->need_step_over
)
4048 debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread
));
4051 if (lwp
->status_pending_p
)
4054 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4060 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4064 /* If the PC has changed since we stopped, then don't do anything,
4065 and let the breakpoint/tracepoint be hit. This happens if, for
4066 instance, GDB handled the decr_pc_after_break subtraction itself,
4067 GDB is OOL stepping this thread, or the user has issued a "jump"
4068 command, or poked thread's registers herself. */
4069 if (pc
!= lwp
->stop_pc
)
4072 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4073 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4075 paddress (lwp
->stop_pc
), paddress (pc
));
4077 lwp
->need_step_over
= 0;
4081 saved_thread
= current_thread
;
4082 current_thread
= thread
;
4084 /* We can only step over breakpoints we know about. */
4085 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4087 /* Don't step over a breakpoint that GDB expects to hit
4088 though. If the condition is being evaluated on the target's side
4089 and it evaluate to false, step over this breakpoint as well. */
4090 if (gdb_breakpoint_here (pc
)
4091 && gdb_condition_true_at_breakpoint (pc
)
4092 && gdb_no_commands_at_breakpoint (pc
))
4095 debug_printf ("Need step over [LWP %ld]? yes, but found"
4096 " GDB breakpoint at 0x%s; skipping step over\n",
4097 lwpid_of (thread
), paddress (pc
));
4099 current_thread
= saved_thread
;
4105 debug_printf ("Need step over [LWP %ld]? yes, "
4106 "found breakpoint at 0x%s\n",
4107 lwpid_of (thread
), paddress (pc
));
4109 /* We've found an lwp that needs stepping over --- return 1 so
4110 that find_inferior stops looking. */
4111 current_thread
= saved_thread
;
4113 /* If the step over is cancelled, this is set again. */
4114 lwp
->need_step_over
= 0;
4119 current_thread
= saved_thread
;
4122 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4124 lwpid_of (thread
), paddress (pc
));
4129 /* Start a step-over operation on LWP. When LWP stopped at a
4130 breakpoint, to make progress, we need to remove the breakpoint out
4131 of the way. If we let other threads run while we do that, they may
4132 pass by the breakpoint location and miss hitting it. To avoid
4133 that, a step-over momentarily stops all threads while LWP is
4134 single-stepped while the breakpoint is temporarily uninserted from
4135 the inferior. When the single-step finishes, we reinsert the
4136 breakpoint, and let all threads that are supposed to be running,
4139 On targets that don't support hardware single-step, we don't
4140 currently support full software single-stepping. Instead, we only
4141 support stepping over the thread event breakpoint, by asking the
4142 low target where to place a reinsert breakpoint. Since this
4143 routine assumes the breakpoint being stepped over is a thread event
4144 breakpoint, it usually assumes the return address of the current
4145 function is a good enough place to set the reinsert breakpoint. */
4148 start_step_over (struct lwp_info
*lwp
)
4150 struct thread_info
*thread
= get_lwp_thread (lwp
);
4151 struct thread_info
*saved_thread
;
4156 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4159 stop_all_lwps (1, lwp
);
4160 gdb_assert (lwp
->suspended
== 0);
4163 debug_printf ("Done stopping all threads for step-over.\n");
4165 /* Note, we should always reach here with an already adjusted PC,
4166 either by GDB (if we're resuming due to GDB's request), or by our
4167 caller, if we just finished handling an internal breakpoint GDB
4168 shouldn't care about. */
4171 saved_thread
= current_thread
;
4172 current_thread
= thread
;
4174 lwp
->bp_reinsert
= pc
;
4175 uninsert_breakpoints_at (pc
);
4176 uninsert_fast_tracepoint_jumps_at (pc
);
4178 if (can_hardware_single_step ())
4184 CORE_ADDR raddr
= (*the_low_target
.breakpoint_reinsert_addr
) ();
4185 set_reinsert_breakpoint (raddr
);
4189 current_thread
= saved_thread
;
4191 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4193 /* Require next event from this LWP. */
4194 step_over_bkpt
= thread
->entry
.id
;
4198 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4199 start_step_over, if still there, and delete any reinsert
4200 breakpoints we've set, on non hardware single-step targets. */
4203 finish_step_over (struct lwp_info
*lwp
)
4205 if (lwp
->bp_reinsert
!= 0)
4208 debug_printf ("Finished step over.\n");
4210 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4211 may be no breakpoint to reinsert there by now. */
4212 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4213 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4215 lwp
->bp_reinsert
= 0;
4217 /* Delete any software-single-step reinsert breakpoints. No
4218 longer needed. We don't have to worry about other threads
4219 hitting this trap, and later not being able to explain it,
4220 because we were stepping over a breakpoint, and we hold all
4221 threads but LWP stopped while doing that. */
4222 if (!can_hardware_single_step ())
4223 delete_reinsert_breakpoints ();
4225 step_over_bkpt
= null_ptid
;
4232 /* This function is called once per thread. We check the thread's resume
4233 request, which will tell us whether to resume, step, or leave the thread
4234 stopped; and what signal, if any, it should be sent.
4236 For threads which we aren't explicitly told otherwise, we preserve
4237 the stepping flag; this is used for stepping over gdbserver-placed
4240 If pending_flags was set in any thread, we queue any needed
4241 signals, since we won't actually resume. We already have a pending
4242 event to report, so we don't need to preserve any step requests;
4243 they should be re-issued if necessary. */
4246 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
4248 struct thread_info
*thread
= (struct thread_info
*) entry
;
4249 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4251 int leave_all_stopped
= * (int *) arg
;
4254 if (lwp
->resume
== NULL
)
4257 if (lwp
->resume
->kind
== resume_stop
)
4260 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4265 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
4267 /* Stop the thread, and wait for the event asynchronously,
4268 through the event loop. */
4274 debug_printf ("already stopped LWP %ld\n",
4277 /* The LWP may have been stopped in an internal event that
4278 was not meant to be notified back to GDB (e.g., gdbserver
4279 breakpoint), so we should be reporting a stop event in
4282 /* If the thread already has a pending SIGSTOP, this is a
4283 no-op. Otherwise, something later will presumably resume
4284 the thread and this will cause it to cancel any pending
4285 operation, due to last_resume_kind == resume_stop. If
4286 the thread already has a pending status to report, we
4287 will still report it the next time we wait - see
4288 status_pending_p_callback. */
4290 /* If we already have a pending signal to report, then
4291 there's no need to queue a SIGSTOP, as this means we're
4292 midway through moving the LWP out of the jumppad, and we
4293 will report the pending signal as soon as that is
4295 if (lwp
->pending_signals_to_report
== NULL
)
4299 /* For stop requests, we're done. */
4301 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4305 /* If this thread which is about to be resumed has a pending status,
4306 then don't resume any threads - we can just report the pending
4307 status. Make sure to queue any signals that would otherwise be
4308 sent. In all-stop mode, we do this decision based on if *any*
4309 thread has a pending status. If there's a thread that needs the
4310 step-over-breakpoint dance, then don't resume any other thread
4311 but that particular one. */
4312 leave_pending
= (lwp
->status_pending_p
|| leave_all_stopped
);
4317 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
4319 step
= (lwp
->resume
->kind
== resume_step
);
4320 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
4325 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
4327 /* If we have a new signal, enqueue the signal. */
4328 if (lwp
->resume
->sig
!= 0)
4330 struct pending_signals
*p_sig
;
4331 p_sig
= xmalloc (sizeof (*p_sig
));
4332 p_sig
->prev
= lwp
->pending_signals
;
4333 p_sig
->signal
= lwp
->resume
->sig
;
4334 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4336 /* If this is the same signal we were previously stopped by,
4337 make sure to queue its siginfo. We can ignore the return
4338 value of ptrace; if it fails, we'll skip
4339 PTRACE_SETSIGINFO. */
4340 if (WIFSTOPPED (lwp
->last_status
)
4341 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
4342 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4345 lwp
->pending_signals
= p_sig
;
4349 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4355 linux_resume (struct thread_resume
*resume_info
, size_t n
)
4357 struct thread_resume_array array
= { resume_info
, n
};
4358 struct thread_info
*need_step_over
= NULL
;
4360 int leave_all_stopped
;
4365 debug_printf ("linux_resume:\n");
4368 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
4370 /* If there is a thread which would otherwise be resumed, which has
4371 a pending status, then don't resume any threads - we can just
4372 report the pending status. Make sure to queue any signals that
4373 would otherwise be sent. In non-stop mode, we'll apply this
4374 logic to each thread individually. We consume all pending events
4375 before considering to start a step-over (in all-stop). */
4378 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
4380 /* If there is a thread which would otherwise be resumed, which is
4381 stopped at a breakpoint that needs stepping over, then don't
4382 resume any threads - have it step over the breakpoint with all
4383 other threads stopped, then resume all threads again. Make sure
4384 to queue any signals that would otherwise be delivered or
4386 if (!any_pending
&& supports_breakpoints ())
4388 = (struct thread_info
*) find_inferior (&all_threads
,
4389 need_step_over_p
, NULL
);
4391 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
4395 if (need_step_over
!= NULL
)
4396 debug_printf ("Not resuming all, need step over\n");
4397 else if (any_pending
)
4398 debug_printf ("Not resuming, all-stop and found "
4399 "an LWP with pending status\n");
4401 debug_printf ("Resuming, no pending status or step over needed\n");
4404 /* Even if we're leaving threads stopped, queue all signals we'd
4405 otherwise deliver. */
4406 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
4409 start_step_over (get_thread_lwp (need_step_over
));
4413 debug_printf ("linux_resume done\n");
4418 /* This function is called once per thread. We check the thread's
4419 last resume request, which will tell us whether to resume, step, or
4420 leave the thread stopped. Any signal the client requested to be
4421 delivered has already been enqueued at this point.
4423 If any thread that GDB wants running is stopped at an internal
4424 breakpoint that needs stepping over, we start a step-over operation
4425 on that particular thread, and leave all others stopped. */
4428 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4430 struct thread_info
*thread
= (struct thread_info
*) entry
;
4431 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4438 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
4443 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
4447 if (thread
->last_resume_kind
== resume_stop
4448 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
4451 debug_printf (" client wants LWP to remain %ld stopped\n",
4456 if (lwp
->status_pending_p
)
4459 debug_printf (" LWP %ld has pending status, leaving stopped\n",
4464 gdb_assert (lwp
->suspended
>= 0);
4469 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
4473 if (thread
->last_resume_kind
== resume_stop
4474 && lwp
->pending_signals_to_report
== NULL
4475 && lwp
->collecting_fast_tracepoint
== 0)
4477 /* We haven't reported this LWP as stopped yet (otherwise, the
4478 last_status.kind check above would catch it, and we wouldn't
4479 reach here. This LWP may have been momentarily paused by a
4480 stop_all_lwps call while handling for example, another LWP's
4481 step-over. In that case, the pending expected SIGSTOP signal
4482 that was queued at vCont;t handling time will have already
4483 been consumed by wait_for_sigstop, and so we need to requeue
4484 another one here. Note that if the LWP already has a SIGSTOP
4485 pending, this is a no-op. */
4488 debug_printf ("Client wants LWP %ld to stop. "
4489 "Making sure it has a SIGSTOP pending\n",
4495 step
= thread
->last_resume_kind
== resume_step
;
4496 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4501 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4503 struct thread_info
*thread
= (struct thread_info
*) entry
;
4504 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4510 gdb_assert (lwp
->suspended
>= 0);
4512 return proceed_one_lwp (entry
, except
);
4515 /* When we finish a step-over, set threads running again. If there's
4516 another thread that may need a step-over, now's the time to start
4517 it. Eventually, we'll move all threads past their breakpoints. */
4520 proceed_all_lwps (void)
4522 struct thread_info
*need_step_over
;
4524 /* If there is a thread which would otherwise be resumed, which is
4525 stopped at a breakpoint that needs stepping over, then don't
4526 resume any threads - have it step over the breakpoint with all
4527 other threads stopped, then resume all threads again. */
4529 if (supports_breakpoints ())
4532 = (struct thread_info
*) find_inferior (&all_threads
,
4533 need_step_over_p
, NULL
);
4535 if (need_step_over
!= NULL
)
4538 debug_printf ("proceed_all_lwps: found "
4539 "thread %ld needing a step-over\n",
4540 lwpid_of (need_step_over
));
4542 start_step_over (get_thread_lwp (need_step_over
));
4548 debug_printf ("Proceeding, no step-over needed\n");
4550 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
4553 /* Stopped LWPs that the client wanted to be running, that don't have
4554 pending statuses, are set to run again, except for EXCEPT, if not
4555 NULL. This undoes a stop_all_lwps call. */
4558 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
4564 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
4565 lwpid_of (get_lwp_thread (except
)));
4567 debug_printf ("unstopping all lwps\n");
4571 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
4573 find_inferior (&all_threads
, proceed_one_lwp
, except
);
4577 debug_printf ("unstop_all_lwps done\n");
4583 #ifdef HAVE_LINUX_REGSETS
4585 #define use_linux_regsets 1
4587 /* Returns true if REGSET has been disabled. */
4590 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
4592 return (info
->disabled_regsets
!= NULL
4593 && info
->disabled_regsets
[regset
- info
->regsets
]);
4596 /* Disable REGSET. */
4599 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
4603 dr_offset
= regset
- info
->regsets
;
4604 if (info
->disabled_regsets
== NULL
)
4605 info
->disabled_regsets
= xcalloc (1, info
->num_regsets
);
4606 info
->disabled_regsets
[dr_offset
] = 1;
4610 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
4611 struct regcache
*regcache
)
4613 struct regset_info
*regset
;
4614 int saw_general_regs
= 0;
4618 pid
= lwpid_of (current_thread
);
4619 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4624 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4627 buf
= xmalloc (regset
->size
);
4629 nt_type
= regset
->nt_type
;
4633 iov
.iov_len
= regset
->size
;
4634 data
= (void *) &iov
;
4640 res
= ptrace (regset
->get_request
, pid
,
4641 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4643 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4649 /* If we get EIO on a regset, do not try it again for
4650 this process mode. */
4651 disable_regset (regsets_info
, regset
);
4653 else if (errno
== ENODATA
)
4655 /* ENODATA may be returned if the regset is currently
4656 not "active". This can happen in normal operation,
4657 so suppress the warning in this case. */
4662 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
4669 if (regset
->type
== GENERAL_REGS
)
4670 saw_general_regs
= 1;
4671 regset
->store_function (regcache
, buf
);
4675 if (saw_general_regs
)
4682 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
4683 struct regcache
*regcache
)
4685 struct regset_info
*regset
;
4686 int saw_general_regs
= 0;
4690 pid
= lwpid_of (current_thread
);
4691 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4696 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
4697 || regset
->fill_function
== NULL
)
4700 buf
= xmalloc (regset
->size
);
4702 /* First fill the buffer with the current register set contents,
4703 in case there are any items in the kernel's regset that are
4704 not in gdbserver's regcache. */
4706 nt_type
= regset
->nt_type
;
4710 iov
.iov_len
= regset
->size
;
4711 data
= (void *) &iov
;
4717 res
= ptrace (regset
->get_request
, pid
,
4718 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4720 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4725 /* Then overlay our cached registers on that. */
4726 regset
->fill_function (regcache
, buf
);
4728 /* Only now do we write the register set. */
4730 res
= ptrace (regset
->set_request
, pid
,
4731 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4733 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
4741 /* If we get EIO on a regset, do not try it again for
4742 this process mode. */
4743 disable_regset (regsets_info
, regset
);
4745 else if (errno
== ESRCH
)
4747 /* At this point, ESRCH should mean the process is
4748 already gone, in which case we simply ignore attempts
4749 to change its registers. See also the related
4750 comment in linux_resume_one_lwp. */
4756 perror ("Warning: ptrace(regsets_store_inferior_registers)");
4759 else if (regset
->type
== GENERAL_REGS
)
4760 saw_general_regs
= 1;
4763 if (saw_general_regs
)
4769 #else /* !HAVE_LINUX_REGSETS */
4771 #define use_linux_regsets 0
4772 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
4773 #define regsets_store_inferior_registers(regsets_info, regcache) 1
4777 /* Return 1 if register REGNO is supported by one of the regset ptrace
4778 calls or 0 if it has to be transferred individually. */
4781 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
4783 unsigned char mask
= 1 << (regno
% 8);
4784 size_t index
= regno
/ 8;
4786 return (use_linux_regsets
4787 && (regs_info
->regset_bitmap
== NULL
4788 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
4791 #ifdef HAVE_LINUX_USRREGS
4794 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
4798 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
4799 error ("Invalid register number %d.", regnum
);
4801 addr
= usrregs
->regmap
[regnum
];
4806 /* Fetch one register. */
4808 fetch_register (const struct usrregs_info
*usrregs
,
4809 struct regcache
*regcache
, int regno
)
4816 if (regno
>= usrregs
->num_regs
)
4818 if ((*the_low_target
.cannot_fetch_register
) (regno
))
4821 regaddr
= register_addr (usrregs
, regno
);
4825 size
= ((register_size (regcache
->tdesc
, regno
)
4826 + sizeof (PTRACE_XFER_TYPE
) - 1)
4827 & -sizeof (PTRACE_XFER_TYPE
));
4828 buf
= alloca (size
);
4830 pid
= lwpid_of (current_thread
);
4831 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4834 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
4835 ptrace (PTRACE_PEEKUSER
, pid
,
4836 /* Coerce to a uintptr_t first to avoid potential gcc warning
4837 of coercing an 8 byte integer to a 4 byte pointer. */
4838 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
4839 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4841 error ("reading register %d: %s", regno
, strerror (errno
));
4844 if (the_low_target
.supply_ptrace_register
)
4845 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
4847 supply_register (regcache
, regno
, buf
);
4850 /* Store one register. */
4852 store_register (const struct usrregs_info
*usrregs
,
4853 struct regcache
*regcache
, int regno
)
4860 if (regno
>= usrregs
->num_regs
)
4862 if ((*the_low_target
.cannot_store_register
) (regno
))
4865 regaddr
= register_addr (usrregs
, regno
);
4869 size
= ((register_size (regcache
->tdesc
, regno
)
4870 + sizeof (PTRACE_XFER_TYPE
) - 1)
4871 & -sizeof (PTRACE_XFER_TYPE
));
4872 buf
= alloca (size
);
4873 memset (buf
, 0, size
);
4875 if (the_low_target
.collect_ptrace_register
)
4876 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
4878 collect_register (regcache
, regno
, buf
);
4880 pid
= lwpid_of (current_thread
);
4881 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4884 ptrace (PTRACE_POKEUSER
, pid
,
4885 /* Coerce to a uintptr_t first to avoid potential gcc warning
4886 about coercing an 8 byte integer to a 4 byte pointer. */
4887 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
4888 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
4891 /* At this point, ESRCH should mean the process is
4892 already gone, in which case we simply ignore attempts
4893 to change its registers. See also the related
4894 comment in linux_resume_one_lwp. */
4898 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
4899 error ("writing register %d: %s", regno
, strerror (errno
));
4901 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4905 /* Fetch all registers, or just one, from the child process.
4906 If REGNO is -1, do this for all registers, skipping any that are
4907 assumed to have been retrieved by regsets_fetch_inferior_registers,
4908 unless ALL is non-zero.
4909 Otherwise, REGNO specifies which register (so we can save time). */
4911 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
4912 struct regcache
*regcache
, int regno
, int all
)
4914 struct usrregs_info
*usr
= regs_info
->usrregs
;
4918 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4919 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4920 fetch_register (usr
, regcache
, regno
);
4923 fetch_register (usr
, regcache
, regno
);
4926 /* Store our register values back into the inferior.
4927 If REGNO is -1, do this for all registers, skipping any that are
4928 assumed to have been saved by regsets_store_inferior_registers,
4929 unless ALL is non-zero.
4930 Otherwise, REGNO specifies which register (so we can save time). */
4932 usr_store_inferior_registers (const struct regs_info
*regs_info
,
4933 struct regcache
*regcache
, int regno
, int all
)
4935 struct usrregs_info
*usr
= regs_info
->usrregs
;
4939 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4940 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4941 store_register (usr
, regcache
, regno
);
4944 store_register (usr
, regcache
, regno
);
4947 #else /* !HAVE_LINUX_USRREGS */
4949 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4950 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4956 linux_fetch_registers (struct regcache
*regcache
, int regno
)
4960 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4964 if (the_low_target
.fetch_register
!= NULL
4965 && regs_info
->usrregs
!= NULL
)
4966 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
4967 (*the_low_target
.fetch_register
) (regcache
, regno
);
4969 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
4970 if (regs_info
->usrregs
!= NULL
)
4971 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
4975 if (the_low_target
.fetch_register
!= NULL
4976 && (*the_low_target
.fetch_register
) (regcache
, regno
))
4979 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4981 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
4983 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4984 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
4989 linux_store_registers (struct regcache
*regcache
, int regno
)
4993 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4997 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4999 if (regs_info
->usrregs
!= NULL
)
5000 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5004 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5006 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5008 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5009 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5014 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5015 to debugger memory starting at MYADDR. */
5018 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5020 int pid
= lwpid_of (current_thread
);
5021 register PTRACE_XFER_TYPE
*buffer
;
5022 register CORE_ADDR addr
;
5029 /* Try using /proc. Don't bother for one word. */
5030 if (len
>= 3 * sizeof (long))
5034 /* We could keep this file open and cache it - possibly one per
5035 thread. That requires some juggling, but is even faster. */
5036 sprintf (filename
, "/proc/%d/mem", pid
);
5037 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5041 /* If pread64 is available, use it. It's faster if the kernel
5042 supports it (only one syscall), and it's 64-bit safe even on
5043 32-bit platforms (for instance, SPARC debugging a SPARC64
5046 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5049 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5050 bytes
= read (fd
, myaddr
, len
);
5057 /* Some data was read, we'll try to get the rest with ptrace. */
5067 /* Round starting address down to longword boundary. */
5068 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5069 /* Round ending address up; get number of longwords that makes. */
5070 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5071 / sizeof (PTRACE_XFER_TYPE
));
5072 /* Allocate buffer of that many longwords. */
5073 buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
5075 /* Read all the longwords */
5077 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5079 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5080 about coercing an 8 byte integer to a 4 byte pointer. */
5081 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5082 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5083 (PTRACE_TYPE_ARG4
) 0);
5089 /* Copy appropriate bytes out of the buffer. */
5092 i
*= sizeof (PTRACE_XFER_TYPE
);
5093 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5095 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5102 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5103 memory at MEMADDR. On failure (cannot write to the inferior)
5104 returns the value of errno. Always succeeds if LEN is zero. */
5107 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5110 /* Round starting address down to longword boundary. */
5111 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5112 /* Round ending address up; get number of longwords that makes. */
5114 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5115 / sizeof (PTRACE_XFER_TYPE
);
5117 /* Allocate buffer of that many longwords. */
5118 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*)
5119 alloca (count
* sizeof (PTRACE_XFER_TYPE
));
5121 int pid
= lwpid_of (current_thread
);
5125 /* Zero length write always succeeds. */
5131 /* Dump up to four bytes. */
5132 unsigned int val
= * (unsigned int *) myaddr
;
5138 val
= val
& 0xffffff;
5139 debug_printf ("Writing %0*x to 0x%08lx in process %d\n",
5140 2 * ((len
< 4) ? len
: 4), val
, (long)memaddr
, pid
);
5143 /* Fill start and end extra bytes of buffer with existing memory data. */
5146 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5147 about coercing an 8 byte integer to a 4 byte pointer. */
5148 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5149 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5150 (PTRACE_TYPE_ARG4
) 0);
5158 = ptrace (PTRACE_PEEKTEXT
, pid
,
5159 /* Coerce to a uintptr_t first to avoid potential gcc warning
5160 about coercing an 8 byte integer to a 4 byte pointer. */
5161 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5162 * sizeof (PTRACE_XFER_TYPE
)),
5163 (PTRACE_TYPE_ARG4
) 0);
5168 /* Copy data to be written over corresponding part of buffer. */
5170 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5173 /* Write the entire buffer. */
5175 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5178 ptrace (PTRACE_POKETEXT
, pid
,
5179 /* Coerce to a uintptr_t first to avoid potential gcc warning
5180 about coercing an 8 byte integer to a 4 byte pointer. */
5181 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5182 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5191 linux_look_up_symbols (void)
5193 #ifdef USE_THREAD_DB
5194 struct process_info
*proc
= current_process ();
5196 if (proc
->priv
->thread_db
!= NULL
)
5199 /* If the kernel supports tracing clones, then we don't need to
5200 use the magic thread event breakpoint to learn about
5202 thread_db_init (!linux_supports_traceclone ());
5207 linux_request_interrupt (void)
5209 extern unsigned long signal_pid
;
5211 /* Send a SIGINT to the process group. This acts just like the user
5212 typed a ^C on the controlling terminal. */
5213 kill (-signal_pid
, SIGINT
);
5216 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5217 to debugger memory starting at MYADDR. */
5220 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5222 char filename
[PATH_MAX
];
5224 int pid
= lwpid_of (current_thread
);
5226 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5228 fd
= open (filename
, O_RDONLY
);
5232 if (offset
!= (CORE_ADDR
) 0
5233 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5236 n
= read (fd
, myaddr
, len
);
5243 /* These breakpoint and watchpoint related wrapper functions simply
5244 pass on the function call if the target has registered a
5245 corresponding function. */
5248 linux_supports_z_point_type (char z_type
)
5250 return (the_low_target
.supports_z_point_type
!= NULL
5251 && the_low_target
.supports_z_point_type (z_type
));
5255 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5256 int size
, struct raw_breakpoint
*bp
)
5258 if (type
== raw_bkpt_type_sw
)
5259 return insert_memory_breakpoint (bp
);
5260 else if (the_low_target
.insert_point
!= NULL
)
5261 return the_low_target
.insert_point (type
, addr
, size
, bp
);
5263 /* Unsupported (see target.h). */
5268 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5269 int size
, struct raw_breakpoint
*bp
)
5271 if (type
== raw_bkpt_type_sw
)
5272 return remove_memory_breakpoint (bp
);
5273 else if (the_low_target
.remove_point
!= NULL
)
5274 return the_low_target
.remove_point (type
, addr
, size
, bp
);
5276 /* Unsupported (see target.h). */
5280 /* Implement the to_stopped_by_sw_breakpoint target_ops
5284 linux_stopped_by_sw_breakpoint (void)
5286 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5288 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
5291 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
5295 linux_supports_stopped_by_sw_breakpoint (void)
5297 return USE_SIGTRAP_SIGINFO
;
5300 /* Implement the to_stopped_by_hw_breakpoint target_ops
5304 linux_stopped_by_hw_breakpoint (void)
5306 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5308 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
5311 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
5315 linux_supports_stopped_by_hw_breakpoint (void)
5317 return USE_SIGTRAP_SIGINFO
;
5320 /* Implement the supports_conditional_breakpoints target_ops
5324 linux_supports_conditional_breakpoints (void)
5326 /* GDBserver needs to step over the breakpoint if the condition is
5327 false. GDBserver software single step is too simple, so disable
5328 conditional breakpoints if the target doesn't have hardware single
5330 return can_hardware_single_step ();
5334 linux_stopped_by_watchpoint (void)
5336 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5338 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
5342 linux_stopped_data_address (void)
5344 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5346 return lwp
->stopped_data_address
;
5349 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
5350 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
5351 && defined(PT_TEXT_END_ADDR)
5353 /* This is only used for targets that define PT_TEXT_ADDR,
5354 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
5355 the target has different ways of acquiring this information, like
5358 /* Under uClinux, programs are loaded at non-zero offsets, which we need
5359 to tell gdb about. */
5362 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
5364 unsigned long text
, text_end
, data
;
5365 int pid
= lwpid_of (current_thread
);
5369 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
5370 (PTRACE_TYPE_ARG4
) 0);
5371 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
5372 (PTRACE_TYPE_ARG4
) 0);
5373 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
5374 (PTRACE_TYPE_ARG4
) 0);
5378 /* Both text and data offsets produced at compile-time (and so
5379 used by gdb) are relative to the beginning of the program,
5380 with the data segment immediately following the text segment.
5381 However, the actual runtime layout in memory may put the data
5382 somewhere else, so when we send gdb a data base-address, we
5383 use the real data base address and subtract the compile-time
5384 data base-address from it (which is just the length of the
5385 text segment). BSS immediately follows data in both
5388 *data_p
= data
- (text_end
- text
);
5397 linux_qxfer_osdata (const char *annex
,
5398 unsigned char *readbuf
, unsigned const char *writebuf
,
5399 CORE_ADDR offset
, int len
)
5401 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
5404 /* Convert a native/host siginfo object, into/from the siginfo in the
5405 layout of the inferiors' architecture. */
5408 siginfo_fixup (siginfo_t
*siginfo
, void *inf_siginfo
, int direction
)
5412 if (the_low_target
.siginfo_fixup
!= NULL
)
5413 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
5415 /* If there was no callback, or the callback didn't do anything,
5416 then just do a straight memcpy. */
5420 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
5422 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
5427 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
5428 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
5432 char inf_siginfo
[sizeof (siginfo_t
)];
5434 if (current_thread
== NULL
)
5437 pid
= lwpid_of (current_thread
);
5440 debug_printf ("%s siginfo for lwp %d.\n",
5441 readbuf
!= NULL
? "Reading" : "Writing",
5444 if (offset
>= sizeof (siginfo
))
5447 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5450 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
5451 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
5452 inferior with a 64-bit GDBSERVER should look the same as debugging it
5453 with a 32-bit GDBSERVER, we need to convert it. */
5454 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
5456 if (offset
+ len
> sizeof (siginfo
))
5457 len
= sizeof (siginfo
) - offset
;
5459 if (readbuf
!= NULL
)
5460 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
5463 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
5465 /* Convert back to ptrace layout before flushing it out. */
5466 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
5468 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5475 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5476 so we notice when children change state; as the handler for the
5477 sigsuspend in my_waitpid. */
5480 sigchld_handler (int signo
)
5482 int old_errno
= errno
;
5488 /* fprintf is not async-signal-safe, so call write
5490 if (write (2, "sigchld_handler\n",
5491 sizeof ("sigchld_handler\n") - 1) < 0)
5492 break; /* just ignore */
5496 if (target_is_async_p ())
5497 async_file_mark (); /* trigger a linux_wait */
5503 linux_supports_non_stop (void)
5509 linux_async (int enable
)
5511 int previous
= target_is_async_p ();
5514 debug_printf ("linux_async (%d), previous=%d\n",
5517 if (previous
!= enable
)
5520 sigemptyset (&mask
);
5521 sigaddset (&mask
, SIGCHLD
);
5523 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
5527 if (pipe (linux_event_pipe
) == -1)
5529 linux_event_pipe
[0] = -1;
5530 linux_event_pipe
[1] = -1;
5531 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5533 warning ("creating event pipe failed.");
5537 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5538 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5540 /* Register the event loop handler. */
5541 add_file_handler (linux_event_pipe
[0],
5542 handle_target_event
, NULL
);
5544 /* Always trigger a linux_wait. */
5549 delete_file_handler (linux_event_pipe
[0]);
5551 close (linux_event_pipe
[0]);
5552 close (linux_event_pipe
[1]);
5553 linux_event_pipe
[0] = -1;
5554 linux_event_pipe
[1] = -1;
5557 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5564 linux_start_non_stop (int nonstop
)
5566 /* Register or unregister from event-loop accordingly. */
5567 linux_async (nonstop
);
5569 if (target_is_async_p () != (nonstop
!= 0))
5576 linux_supports_multi_process (void)
5581 /* Check if fork events are supported. */
5584 linux_supports_fork_events (void)
5586 return linux_supports_tracefork ();
5589 /* Check if vfork events are supported. */
5592 linux_supports_vfork_events (void)
5594 return linux_supports_tracefork ();
5597 /* Callback for 'find_inferior'. Set the (possibly changed) ptrace
5598 options for the specified lwp. */
5601 reset_lwp_ptrace_options_callback (struct inferior_list_entry
*entry
,
5604 struct thread_info
*thread
= (struct thread_info
*) entry
;
5605 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5609 /* Stop the lwp so we can modify its ptrace options. */
5610 lwp
->must_set_ptrace_flags
= 1;
5611 linux_stop_lwp (lwp
);
5615 /* Already stopped; go ahead and set the ptrace options. */
5616 struct process_info
*proc
= find_process_pid (pid_of (thread
));
5617 int options
= linux_low_ptrace_options (proc
->attached
);
5619 linux_enable_event_reporting (lwpid_of (thread
), options
);
5620 lwp
->must_set_ptrace_flags
= 0;
5626 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
5627 ptrace flags for all inferiors. This is in case the new GDB connection
5628 doesn't support the same set of events that the previous one did. */
5631 linux_handle_new_gdb_connection (void)
5635 /* Request that all the lwps reset their ptrace options. */
5636 find_inferior (&all_threads
, reset_lwp_ptrace_options_callback
, &pid
);
5640 linux_supports_disable_randomization (void)
5642 #ifdef HAVE_PERSONALITY
5650 linux_supports_agent (void)
5656 linux_supports_range_stepping (void)
5658 if (*the_low_target
.supports_range_stepping
== NULL
)
5661 return (*the_low_target
.supports_range_stepping
) ();
5664 /* Enumerate spufs IDs for process PID. */
5666 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
5672 struct dirent
*entry
;
5674 sprintf (path
, "/proc/%ld/fd", pid
);
5675 dir
= opendir (path
);
5680 while ((entry
= readdir (dir
)) != NULL
)
5686 fd
= atoi (entry
->d_name
);
5690 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
5691 if (stat (path
, &st
) != 0)
5693 if (!S_ISDIR (st
.st_mode
))
5696 if (statfs (path
, &stfs
) != 0)
5698 if (stfs
.f_type
!= SPUFS_MAGIC
)
5701 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
5703 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
5713 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
5714 object type, using the /proc file system. */
5716 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
5717 unsigned const char *writebuf
,
5718 CORE_ADDR offset
, int len
)
5720 long pid
= lwpid_of (current_thread
);
5725 if (!writebuf
&& !readbuf
)
5733 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
5736 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
5737 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
5742 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5749 ret
= write (fd
, writebuf
, (size_t) len
);
5751 ret
= read (fd
, readbuf
, (size_t) len
);
5757 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
5758 struct target_loadseg
5760 /* Core address to which the segment is mapped. */
5762 /* VMA recorded in the program header. */
5764 /* Size of this segment in memory. */
5768 # if defined PT_GETDSBT
5769 struct target_loadmap
5771 /* Protocol version number, must be zero. */
5773 /* Pointer to the DSBT table, its size, and the DSBT index. */
5774 unsigned *dsbt_table
;
5775 unsigned dsbt_size
, dsbt_index
;
5776 /* Number of segments in this map. */
5778 /* The actual memory map. */
5779 struct target_loadseg segs
[/*nsegs*/];
5781 # define LINUX_LOADMAP PT_GETDSBT
5782 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
5783 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
5785 struct target_loadmap
5787 /* Protocol version number, must be zero. */
5789 /* Number of segments in this map. */
5791 /* The actual memory map. */
5792 struct target_loadseg segs
[/*nsegs*/];
5794 # define LINUX_LOADMAP PTRACE_GETFDPIC
5795 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
5796 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
5800 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
5801 unsigned char *myaddr
, unsigned int len
)
5803 int pid
= lwpid_of (current_thread
);
5805 struct target_loadmap
*data
= NULL
;
5806 unsigned int actual_length
, copy_length
;
5808 if (strcmp (annex
, "exec") == 0)
5809 addr
= (int) LINUX_LOADMAP_EXEC
;
5810 else if (strcmp (annex
, "interp") == 0)
5811 addr
= (int) LINUX_LOADMAP_INTERP
;
5815 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
5821 actual_length
= sizeof (struct target_loadmap
)
5822 + sizeof (struct target_loadseg
) * data
->nsegs
;
5824 if (offset
< 0 || offset
> actual_length
)
5827 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
5828 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
5832 # define linux_read_loadmap NULL
5833 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
5836 linux_process_qsupported (const char *query
)
5838 if (the_low_target
.process_qsupported
!= NULL
)
5839 the_low_target
.process_qsupported (query
);
5843 linux_supports_tracepoints (void)
5845 if (*the_low_target
.supports_tracepoints
== NULL
)
5848 return (*the_low_target
.supports_tracepoints
) ();
5852 linux_read_pc (struct regcache
*regcache
)
5854 if (the_low_target
.get_pc
== NULL
)
5857 return (*the_low_target
.get_pc
) (regcache
);
5861 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
5863 gdb_assert (the_low_target
.set_pc
!= NULL
);
5865 (*the_low_target
.set_pc
) (regcache
, pc
);
5869 linux_thread_stopped (struct thread_info
*thread
)
5871 return get_thread_lwp (thread
)->stopped
;
5874 /* This exposes stop-all-threads functionality to other modules. */
5877 linux_pause_all (int freeze
)
5879 stop_all_lwps (freeze
, NULL
);
5882 /* This exposes unstop-all-threads functionality to other gdbserver
5886 linux_unpause_all (int unfreeze
)
5888 unstop_all_lwps (unfreeze
, NULL
);
5892 linux_prepare_to_access_memory (void)
5894 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5897 linux_pause_all (1);
5902 linux_done_accessing_memory (void)
5904 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5907 linux_unpause_all (1);
5911 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
5912 CORE_ADDR collector
,
5915 CORE_ADDR
*jump_entry
,
5916 CORE_ADDR
*trampoline
,
5917 ULONGEST
*trampoline_size
,
5918 unsigned char *jjump_pad_insn
,
5919 ULONGEST
*jjump_pad_insn_size
,
5920 CORE_ADDR
*adjusted_insn_addr
,
5921 CORE_ADDR
*adjusted_insn_addr_end
,
5924 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
5925 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
5926 jump_entry
, trampoline
, trampoline_size
,
5927 jjump_pad_insn
, jjump_pad_insn_size
,
5928 adjusted_insn_addr
, adjusted_insn_addr_end
,
5932 static struct emit_ops
*
5933 linux_emit_ops (void)
5935 if (the_low_target
.emit_ops
!= NULL
)
5936 return (*the_low_target
.emit_ops
) ();
5942 linux_get_min_fast_tracepoint_insn_len (void)
5944 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
5947 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
5950 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
5951 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
5953 char filename
[PATH_MAX
];
5955 const int auxv_size
= is_elf64
5956 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
5957 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
5959 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5961 fd
= open (filename
, O_RDONLY
);
5967 while (read (fd
, buf
, auxv_size
) == auxv_size
5968 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
5972 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
5974 switch (aux
->a_type
)
5977 *phdr_memaddr
= aux
->a_un
.a_val
;
5980 *num_phdr
= aux
->a_un
.a_val
;
5986 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
5988 switch (aux
->a_type
)
5991 *phdr_memaddr
= aux
->a_un
.a_val
;
5994 *num_phdr
= aux
->a_un
.a_val
;
6002 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6004 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6005 "phdr_memaddr = %ld, phdr_num = %d",
6006 (long) *phdr_memaddr
, *num_phdr
);
6013 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6016 get_dynamic (const int pid
, const int is_elf64
)
6018 CORE_ADDR phdr_memaddr
, relocation
;
6020 unsigned char *phdr_buf
;
6021 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
6023 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6026 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6027 phdr_buf
= alloca (num_phdr
* phdr_size
);
6029 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6032 /* Compute relocation: it is expected to be 0 for "regular" executables,
6033 non-zero for PIE ones. */
6035 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
6038 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6040 if (p
->p_type
== PT_PHDR
)
6041 relocation
= phdr_memaddr
- p
->p_vaddr
;
6045 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6047 if (p
->p_type
== PT_PHDR
)
6048 relocation
= phdr_memaddr
- p
->p_vaddr
;
6051 if (relocation
== -1)
6053 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6054 any real world executables, including PIE executables, have always
6055 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6056 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6057 or present DT_DEBUG anyway (fpc binaries are statically linked).
6059 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6061 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6066 for (i
= 0; i
< num_phdr
; i
++)
6070 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6072 if (p
->p_type
== PT_DYNAMIC
)
6073 return p
->p_vaddr
+ relocation
;
6077 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
6079 if (p
->p_type
== PT_DYNAMIC
)
6080 return p
->p_vaddr
+ relocation
;
6087 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6088 can be 0 if the inferior does not yet have the library list initialized.
6089 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6090 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6093 get_r_debug (const int pid
, const int is_elf64
)
6095 CORE_ADDR dynamic_memaddr
;
6096 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6097 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6100 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6101 if (dynamic_memaddr
== 0)
6104 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6108 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6109 #ifdef DT_MIPS_RLD_MAP
6113 unsigned char buf
[sizeof (Elf64_Xword
)];
6117 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6119 if (linux_read_memory (dyn
->d_un
.d_val
,
6120 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6125 #endif /* DT_MIPS_RLD_MAP */
6127 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6128 map
= dyn
->d_un
.d_val
;
6130 if (dyn
->d_tag
== DT_NULL
)
6135 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6136 #ifdef DT_MIPS_RLD_MAP
6140 unsigned char buf
[sizeof (Elf32_Word
)];
6144 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6146 if (linux_read_memory (dyn
->d_un
.d_val
,
6147 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6152 #endif /* DT_MIPS_RLD_MAP */
6154 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6155 map
= dyn
->d_un
.d_val
;
6157 if (dyn
->d_tag
== DT_NULL
)
6161 dynamic_memaddr
+= dyn_size
;
6167 /* Read one pointer from MEMADDR in the inferior. */
6170 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6174 /* Go through a union so this works on either big or little endian
6175 hosts, when the inferior's pointer size is smaller than the size
6176 of CORE_ADDR. It is assumed the inferior's endianness is the
6177 same of the superior's. */
6180 CORE_ADDR core_addr
;
6185 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6188 if (ptr_size
== sizeof (CORE_ADDR
))
6189 *ptr
= addr
.core_addr
;
6190 else if (ptr_size
== sizeof (unsigned int))
6193 gdb_assert_not_reached ("unhandled pointer size");
6198 struct link_map_offsets
6200 /* Offset and size of r_debug.r_version. */
6201 int r_version_offset
;
6203 /* Offset and size of r_debug.r_map. */
6206 /* Offset to l_addr field in struct link_map. */
6209 /* Offset to l_name field in struct link_map. */
6212 /* Offset to l_ld field in struct link_map. */
6215 /* Offset to l_next field in struct link_map. */
6218 /* Offset to l_prev field in struct link_map. */
6222 /* Construct qXfer:libraries-svr4:read reply. */
6225 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
6226 unsigned const char *writebuf
,
6227 CORE_ADDR offset
, int len
)
6230 unsigned document_len
;
6231 struct process_info_private
*const priv
= current_process ()->priv
;
6232 char filename
[PATH_MAX
];
6235 static const struct link_map_offsets lmo_32bit_offsets
=
6237 0, /* r_version offset. */
6238 4, /* r_debug.r_map offset. */
6239 0, /* l_addr offset in link_map. */
6240 4, /* l_name offset in link_map. */
6241 8, /* l_ld offset in link_map. */
6242 12, /* l_next offset in link_map. */
6243 16 /* l_prev offset in link_map. */
6246 static const struct link_map_offsets lmo_64bit_offsets
=
6248 0, /* r_version offset. */
6249 8, /* r_debug.r_map offset. */
6250 0, /* l_addr offset in link_map. */
6251 8, /* l_name offset in link_map. */
6252 16, /* l_ld offset in link_map. */
6253 24, /* l_next offset in link_map. */
6254 32 /* l_prev offset in link_map. */
6256 const struct link_map_offsets
*lmo
;
6257 unsigned int machine
;
6259 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
6260 int allocated
= 1024;
6262 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
6263 int header_done
= 0;
6265 if (writebuf
!= NULL
)
6267 if (readbuf
== NULL
)
6270 pid
= lwpid_of (current_thread
);
6271 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
6272 is_elf64
= elf_64_file_p (filename
, &machine
);
6273 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
6274 ptr_size
= is_elf64
? 8 : 4;
6276 while (annex
[0] != '\0')
6282 sep
= strchr (annex
, '=');
6287 if (len
== 5 && startswith (annex
, "start"))
6289 else if (len
== 4 && startswith (annex
, "prev"))
6293 annex
= strchr (sep
, ';');
6300 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
6307 if (priv
->r_debug
== 0)
6308 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
6310 /* We failed to find DT_DEBUG. Such situation will not change
6311 for this inferior - do not retry it. Report it to GDB as
6312 E01, see for the reasons at the GDB solib-svr4.c side. */
6313 if (priv
->r_debug
== (CORE_ADDR
) -1)
6316 if (priv
->r_debug
!= 0)
6318 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
6319 (unsigned char *) &r_version
,
6320 sizeof (r_version
)) != 0
6323 warning ("unexpected r_debug version %d", r_version
);
6325 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
6326 &lm_addr
, ptr_size
) != 0)
6328 warning ("unable to read r_map from 0x%lx",
6329 (long) priv
->r_debug
+ lmo
->r_map_offset
);
6334 document
= xmalloc (allocated
);
6335 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
6336 p
= document
+ strlen (document
);
6339 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
6340 &l_name
, ptr_size
) == 0
6341 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
6342 &l_addr
, ptr_size
) == 0
6343 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
6344 &l_ld
, ptr_size
) == 0
6345 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
6346 &l_prev
, ptr_size
) == 0
6347 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
6348 &l_next
, ptr_size
) == 0)
6350 unsigned char libname
[PATH_MAX
];
6352 if (lm_prev
!= l_prev
)
6354 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
6355 (long) lm_prev
, (long) l_prev
);
6359 /* Ignore the first entry even if it has valid name as the first entry
6360 corresponds to the main executable. The first entry should not be
6361 skipped if the dynamic loader was loaded late by a static executable
6362 (see solib-svr4.c parameter ignore_first). But in such case the main
6363 executable does not have PT_DYNAMIC present and this function already
6364 exited above due to failed get_r_debug. */
6367 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
6372 /* Not checking for error because reading may stop before
6373 we've got PATH_MAX worth of characters. */
6375 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
6376 libname
[sizeof (libname
) - 1] = '\0';
6377 if (libname
[0] != '\0')
6379 /* 6x the size for xml_escape_text below. */
6380 size_t len
= 6 * strlen ((char *) libname
);
6385 /* Terminate `<library-list-svr4'. */
6390 while (allocated
< p
- document
+ len
+ 200)
6392 /* Expand to guarantee sufficient storage. */
6393 uintptr_t document_len
= p
- document
;
6395 document
= xrealloc (document
, 2 * allocated
);
6397 p
= document
+ document_len
;
6400 name
= xml_escape_text ((char *) libname
);
6401 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
6402 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
6403 name
, (unsigned long) lm_addr
,
6404 (unsigned long) l_addr
, (unsigned long) l_ld
);
6415 /* Empty list; terminate `<library-list-svr4'. */
6419 strcpy (p
, "</library-list-svr4>");
6421 document_len
= strlen (document
);
6422 if (offset
< document_len
)
6423 document_len
-= offset
;
6426 if (len
> document_len
)
6429 memcpy (readbuf
, document
+ offset
, len
);
6435 #ifdef HAVE_LINUX_BTRACE
6437 /* See to_enable_btrace target method. */
6439 static struct btrace_target_info
*
6440 linux_low_enable_btrace (ptid_t ptid
, const struct btrace_config
*conf
)
6442 struct btrace_target_info
*tinfo
;
6444 tinfo
= linux_enable_btrace (ptid
, conf
);
6446 if (tinfo
!= NULL
&& tinfo
->ptr_bits
== 0)
6448 struct thread_info
*thread
= find_thread_ptid (ptid
);
6449 struct regcache
*regcache
= get_thread_regcache (thread
, 0);
6451 tinfo
->ptr_bits
= register_size (regcache
->tdesc
, 0) * 8;
6457 /* See to_disable_btrace target method. */
6460 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
6462 enum btrace_error err
;
6464 err
= linux_disable_btrace (tinfo
);
6465 return (err
== BTRACE_ERR_NONE
? 0 : -1);
6468 /* Encode an Intel(R) Processor Trace configuration. */
6471 linux_low_encode_pt_config (struct buffer
*buffer
,
6472 const struct btrace_data_pt_config
*config
)
6474 buffer_grow_str (buffer
, "<pt-config>\n");
6476 switch (config
->cpu
.vendor
)
6479 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
6480 "model=\"%u\" stepping=\"%u\"/>\n",
6481 config
->cpu
.family
, config
->cpu
.model
,
6482 config
->cpu
.stepping
);
6489 buffer_grow_str (buffer
, "</pt-config>\n");
6492 /* Encode a raw buffer. */
6495 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
6501 /* We use hex encoding - see common/rsp-low.h. */
6502 buffer_grow_str (buffer
, "<raw>\n");
6508 elem
[0] = tohex ((*data
>> 4) & 0xf);
6509 elem
[1] = tohex (*data
++ & 0xf);
6511 buffer_grow (buffer
, elem
, 2);
6514 buffer_grow_str (buffer
, "</raw>\n");
6517 /* See to_read_btrace target method. */
6520 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
6523 struct btrace_data btrace
;
6524 struct btrace_block
*block
;
6525 enum btrace_error err
;
6528 btrace_data_init (&btrace
);
6530 err
= linux_read_btrace (&btrace
, tinfo
, type
);
6531 if (err
!= BTRACE_ERR_NONE
)
6533 if (err
== BTRACE_ERR_OVERFLOW
)
6534 buffer_grow_str0 (buffer
, "E.Overflow.");
6536 buffer_grow_str0 (buffer
, "E.Generic Error.");
6541 switch (btrace
.format
)
6543 case BTRACE_FORMAT_NONE
:
6544 buffer_grow_str0 (buffer
, "E.No Trace.");
6547 case BTRACE_FORMAT_BTS
:
6548 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
6549 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
6552 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
6554 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
6555 paddress (block
->begin
), paddress (block
->end
));
6557 buffer_grow_str0 (buffer
, "</btrace>\n");
6560 case BTRACE_FORMAT_PT
:
6561 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
6562 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
6563 buffer_grow_str (buffer
, "<pt>\n");
6565 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
6567 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
6568 btrace
.variant
.pt
.size
);
6570 buffer_grow_str (buffer
, "</pt>\n");
6571 buffer_grow_str0 (buffer
, "</btrace>\n");
6575 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
6579 btrace_data_fini (&btrace
);
6583 btrace_data_fini (&btrace
);
6587 /* See to_btrace_conf target method. */
6590 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
6591 struct buffer
*buffer
)
6593 const struct btrace_config
*conf
;
6595 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
6596 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
6598 conf
= linux_btrace_conf (tinfo
);
6601 switch (conf
->format
)
6603 case BTRACE_FORMAT_NONE
:
6606 case BTRACE_FORMAT_BTS
:
6607 buffer_xml_printf (buffer
, "<bts");
6608 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
6609 buffer_xml_printf (buffer
, " />\n");
6612 case BTRACE_FORMAT_PT
:
6613 buffer_xml_printf (buffer
, "<pt");
6614 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
6615 buffer_xml_printf (buffer
, "/>\n");
6620 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
6623 #endif /* HAVE_LINUX_BTRACE */
6625 /* See nat/linux-nat.h. */
6628 current_lwp_ptid (void)
6630 return ptid_of (current_thread
);
6633 static struct target_ops linux_target_ops
= {
6634 linux_create_inferior
,
6643 linux_fetch_registers
,
6644 linux_store_registers
,
6645 linux_prepare_to_access_memory
,
6646 linux_done_accessing_memory
,
6649 linux_look_up_symbols
,
6650 linux_request_interrupt
,
6652 linux_supports_z_point_type
,
6655 linux_stopped_by_sw_breakpoint
,
6656 linux_supports_stopped_by_sw_breakpoint
,
6657 linux_stopped_by_hw_breakpoint
,
6658 linux_supports_stopped_by_hw_breakpoint
,
6659 linux_supports_conditional_breakpoints
,
6660 linux_stopped_by_watchpoint
,
6661 linux_stopped_data_address
,
6662 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6663 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6664 && defined(PT_TEXT_END_ADDR)
6669 #ifdef USE_THREAD_DB
6670 thread_db_get_tls_address
,
6675 hostio_last_error_from_errno
,
6678 linux_supports_non_stop
,
6680 linux_start_non_stop
,
6681 linux_supports_multi_process
,
6682 linux_supports_fork_events
,
6683 linux_supports_vfork_events
,
6684 linux_handle_new_gdb_connection
,
6685 #ifdef USE_THREAD_DB
6686 thread_db_handle_monitor_command
,
6690 linux_common_core_of_thread
,
6692 linux_process_qsupported
,
6693 linux_supports_tracepoints
,
6696 linux_thread_stopped
,
6700 linux_stabilize_threads
,
6701 linux_install_fast_tracepoint_jump_pad
,
6703 linux_supports_disable_randomization
,
6704 linux_get_min_fast_tracepoint_insn_len
,
6705 linux_qxfer_libraries_svr4
,
6706 linux_supports_agent
,
6707 #ifdef HAVE_LINUX_BTRACE
6708 linux_supports_btrace
,
6709 linux_low_enable_btrace
,
6710 linux_low_disable_btrace
,
6711 linux_low_read_btrace
,
6712 linux_low_btrace_conf
,
6720 linux_supports_range_stepping
,
6721 linux_proc_pid_to_exec_file
,
6722 linux_mntns_open_cloexec
,
6724 linux_mntns_readlink
,
6728 linux_init_signals ()
6730 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
6731 to find what the cancel signal actually is. */
6732 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
6733 signal (__SIGRTMIN
+1, SIG_IGN
);
6737 #ifdef HAVE_LINUX_REGSETS
6739 initialize_regsets_info (struct regsets_info
*info
)
6741 for (info
->num_regsets
= 0;
6742 info
->regsets
[info
->num_regsets
].size
>= 0;
6743 info
->num_regsets
++)
6749 initialize_low (void)
6751 struct sigaction sigchld_action
;
6752 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
6753 set_target_ops (&linux_target_ops
);
6754 set_breakpoint_data (the_low_target
.breakpoint
,
6755 the_low_target
.breakpoint_len
);
6756 linux_init_signals ();
6757 linux_ptrace_init_warnings ();
6759 sigchld_action
.sa_handler
= sigchld_handler
;
6760 sigemptyset (&sigchld_action
.sa_mask
);
6761 sigchld_action
.sa_flags
= SA_RESTART
;
6762 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
6764 initialize_low_arch ();
6766 linux_check_ptrace_features ();