1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2014 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"
24 #include "nat/linux-nat.h"
25 #include "nat/linux-waitpid.h"
27 #include <sys/ptrace.h>
28 #include "nat/linux-ptrace.h"
29 #include "nat/linux-procfs.h"
31 #include <sys/ioctl.h>
34 #include <sys/syscall.h>
38 #include <sys/types.h>
43 #include "filestuff.h"
44 #include "tracepoint.h"
47 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
48 then ELFMAG0 will have been defined. If it didn't get included by
49 gdb_proc_service.h then including it will likely introduce a duplicate
50 definition of elf_fpregset_t. */
55 #define SPUFS_MAGIC 0x23c9b64e
58 #ifdef HAVE_PERSONALITY
59 # include <sys/personality.h>
60 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
61 # define ADDR_NO_RANDOMIZE 0x0040000
70 #define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
73 /* This is the kernel's hard limit. Not to be confused with
79 /* Some targets did not define these ptrace constants from the start,
80 so gdbserver defines them locally here. In the future, these may
81 be removed after they are added to asm/ptrace.h. */
82 #if !(defined(PT_TEXT_ADDR) \
83 || defined(PT_DATA_ADDR) \
84 || defined(PT_TEXT_END_ADDR))
85 #if defined(__mcoldfire__)
86 /* These are still undefined in 3.10 kernels. */
87 #define PT_TEXT_ADDR 49*4
88 #define PT_DATA_ADDR 50*4
89 #define PT_TEXT_END_ADDR 51*4
90 /* BFIN already defines these since at least 2.6.32 kernels. */
92 #define PT_TEXT_ADDR 220
93 #define PT_TEXT_END_ADDR 224
94 #define PT_DATA_ADDR 228
95 /* These are still undefined in 3.10 kernels. */
96 #elif defined(__TMS320C6X__)
97 #define PT_TEXT_ADDR (0x10000*4)
98 #define PT_DATA_ADDR (0x10004*4)
99 #define PT_TEXT_END_ADDR (0x10008*4)
103 #ifdef HAVE_LINUX_BTRACE
104 # include "nat/linux-btrace.h"
107 #ifndef HAVE_ELF32_AUXV_T
108 /* Copied from glibc's elf.h. */
111 uint32_t a_type
; /* Entry type */
114 uint32_t a_val
; /* Integer value */
115 /* We use to have pointer elements added here. We cannot do that,
116 though, since it does not work when using 32-bit definitions
117 on 64-bit platforms and vice versa. */
122 #ifndef HAVE_ELF64_AUXV_T
123 /* Copied from glibc's elf.h. */
126 uint64_t a_type
; /* Entry type */
129 uint64_t a_val
; /* Integer value */
130 /* We use to have pointer elements added here. We cannot do that,
131 though, since it does not work when using 32-bit definitions
132 on 64-bit platforms and vice versa. */
137 /* A list of all unknown processes which receive stop signals. Some
138 other process will presumably claim each of these as forked
139 children momentarily. */
141 struct simple_pid_list
143 /* The process ID. */
146 /* The status as reported by waitpid. */
150 struct simple_pid_list
*next
;
152 struct simple_pid_list
*stopped_pids
;
154 /* Trivial list manipulation functions to keep track of a list of new
155 stopped processes. */
158 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
160 struct simple_pid_list
*new_pid
= xmalloc (sizeof (struct simple_pid_list
));
163 new_pid
->status
= status
;
164 new_pid
->next
= *listp
;
169 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
171 struct simple_pid_list
**p
;
173 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
174 if ((*p
)->pid
== pid
)
176 struct simple_pid_list
*next
= (*p
)->next
;
178 *statusp
= (*p
)->status
;
186 enum stopping_threads_kind
188 /* Not stopping threads presently. */
189 NOT_STOPPING_THREADS
,
191 /* Stopping threads. */
194 /* Stopping and suspending threads. */
195 STOPPING_AND_SUSPENDING_THREADS
198 /* This is set while stop_all_lwps is in effect. */
199 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
201 /* FIXME make into a target method? */
202 int using_threads
= 1;
204 /* True if we're presently stabilizing threads (moving them out of
206 static int stabilizing_threads
;
208 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
209 int step
, int signal
, siginfo_t
*info
);
210 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
211 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
212 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
213 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
214 int *wstat
, int options
);
215 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
216 static struct lwp_info
*add_lwp (ptid_t ptid
);
217 static int linux_stopped_by_watchpoint (void);
218 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
219 static void proceed_all_lwps (void);
220 static int finish_step_over (struct lwp_info
*lwp
);
221 static CORE_ADDR
get_stop_pc (struct lwp_info
*lwp
);
222 static int kill_lwp (unsigned long lwpid
, int signo
);
224 /* True if the low target can hardware single-step. Such targets
225 don't need a BREAKPOINT_REINSERT_ADDR callback. */
228 can_hardware_single_step (void)
230 return (the_low_target
.breakpoint_reinsert_addr
== NULL
);
233 /* True if the low target supports memory breakpoints. If so, we'll
234 have a GET_PC implementation. */
237 supports_breakpoints (void)
239 return (the_low_target
.get_pc
!= NULL
);
242 /* Returns true if this target can support fast tracepoints. This
243 does not mean that the in-process agent has been loaded in the
247 supports_fast_tracepoints (void)
249 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
252 /* True if LWP is stopped in its stepping range. */
255 lwp_in_step_range (struct lwp_info
*lwp
)
257 CORE_ADDR pc
= lwp
->stop_pc
;
259 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
262 struct pending_signals
266 struct pending_signals
*prev
;
269 /* The read/write ends of the pipe registered as waitable file in the
271 static int linux_event_pipe
[2] = { -1, -1 };
273 /* True if we're currently in async mode. */
274 #define target_is_async_p() (linux_event_pipe[0] != -1)
276 static void send_sigstop (struct lwp_info
*lwp
);
277 static void wait_for_sigstop (void);
279 /* Return non-zero if HEADER is a 64-bit ELF file. */
282 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
284 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
285 && header
->e_ident
[EI_MAG1
] == ELFMAG1
286 && header
->e_ident
[EI_MAG2
] == ELFMAG2
287 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
289 *machine
= header
->e_machine
;
290 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
297 /* Return non-zero if FILE is a 64-bit ELF file,
298 zero if the file is not a 64-bit ELF file,
299 and -1 if the file is not accessible or doesn't exist. */
302 elf_64_file_p (const char *file
, unsigned int *machine
)
307 fd
= open (file
, O_RDONLY
);
311 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
318 return elf_64_header_p (&header
, machine
);
321 /* Accepts an integer PID; Returns true if the executable PID is
322 running is a 64-bit ELF file.. */
325 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
329 sprintf (file
, "/proc/%d/exe", pid
);
330 return elf_64_file_p (file
, machine
);
334 delete_lwp (struct lwp_info
*lwp
)
336 struct thread_info
*thr
= get_lwp_thread (lwp
);
339 debug_printf ("deleting %ld\n", lwpid_of (thr
));
342 free (lwp
->arch_private
);
346 /* Add a process to the common process list, and set its private
349 static struct process_info
*
350 linux_add_process (int pid
, int attached
)
352 struct process_info
*proc
;
354 proc
= add_process (pid
, attached
);
355 proc
->private = xcalloc (1, sizeof (*proc
->private));
357 /* Set the arch when the first LWP stops. */
358 proc
->private->new_inferior
= 1;
360 if (the_low_target
.new_process
!= NULL
)
361 proc
->private->arch_private
= the_low_target
.new_process ();
366 /* Handle a GNU/Linux extended wait response. If we see a clone
367 event, we need to add the new LWP to our list (and not report the
368 trap to higher layers). */
371 handle_extended_wait (struct lwp_info
*event_child
, int wstat
)
373 int event
= linux_ptrace_get_extended_event (wstat
);
374 struct thread_info
*event_thr
= get_lwp_thread (event_child
);
375 struct lwp_info
*new_lwp
;
377 if (event
== PTRACE_EVENT_CLONE
)
380 unsigned long new_pid
;
383 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
386 /* If we haven't already seen the new PID stop, wait for it now. */
387 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
389 /* The new child has a pending SIGSTOP. We can't affect it until it
390 hits the SIGSTOP, but we're already attached. */
392 ret
= my_waitpid (new_pid
, &status
, __WALL
);
395 perror_with_name ("waiting for new child");
396 else if (ret
!= new_pid
)
397 warning ("wait returned unexpected PID %d", ret
);
398 else if (!WIFSTOPPED (status
))
399 warning ("wait returned unexpected status 0x%x", status
);
403 debug_printf ("HEW: Got clone event "
404 "from LWP %ld, new child is LWP %ld\n",
405 lwpid_of (event_thr
), new_pid
);
407 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
408 new_lwp
= add_lwp (ptid
);
410 /* Either we're going to immediately resume the new thread
411 or leave it stopped. linux_resume_one_lwp is a nop if it
412 thinks the thread is currently running, so set this first
413 before calling linux_resume_one_lwp. */
414 new_lwp
->stopped
= 1;
416 /* If we're suspending all threads, leave this one suspended
418 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
)
419 new_lwp
->suspended
= 1;
421 /* Normally we will get the pending SIGSTOP. But in some cases
422 we might get another signal delivered to the group first.
423 If we do get another signal, be sure not to lose it. */
424 if (WSTOPSIG (status
) == SIGSTOP
)
426 if (stopping_threads
!= NOT_STOPPING_THREADS
)
427 new_lwp
->stop_pc
= get_stop_pc (new_lwp
);
429 linux_resume_one_lwp (new_lwp
, 0, 0, NULL
);
433 new_lwp
->stop_expected
= 1;
435 if (stopping_threads
!= NOT_STOPPING_THREADS
)
437 new_lwp
->stop_pc
= get_stop_pc (new_lwp
);
438 new_lwp
->status_pending_p
= 1;
439 new_lwp
->status_pending
= status
;
442 /* Pass the signal on. This is what GDB does - except
443 shouldn't we really report it instead? */
444 linux_resume_one_lwp (new_lwp
, 0, WSTOPSIG (status
), NULL
);
447 /* Always resume the current thread. If we are stopping
448 threads, it will have a pending SIGSTOP; we may as well
450 linux_resume_one_lwp (event_child
, event_child
->stepping
, 0, NULL
);
454 /* Return the PC as read from the regcache of LWP, without any
458 get_pc (struct lwp_info
*lwp
)
460 struct thread_info
*saved_thread
;
461 struct regcache
*regcache
;
464 if (the_low_target
.get_pc
== NULL
)
467 saved_thread
= current_thread
;
468 current_thread
= get_lwp_thread (lwp
);
470 regcache
= get_thread_regcache (current_thread
, 1);
471 pc
= (*the_low_target
.get_pc
) (regcache
);
474 debug_printf ("pc is 0x%lx\n", (long) pc
);
476 current_thread
= saved_thread
;
480 /* This function should only be called if LWP got a SIGTRAP.
481 The SIGTRAP could mean several things.
483 On i386, where decr_pc_after_break is non-zero:
484 If we were single-stepping this process using PTRACE_SINGLESTEP,
485 we will get only the one SIGTRAP (even if the instruction we
486 stepped over was a breakpoint). The value of $eip will be the
488 If we continue the process using PTRACE_CONT, we will get a
489 SIGTRAP when we hit a breakpoint. The value of $eip will be
490 the instruction after the breakpoint (i.e. needs to be
491 decremented). If we report the SIGTRAP to GDB, we must also
492 report the undecremented PC. If we cancel the SIGTRAP, we
493 must resume at the decremented PC.
495 (Presumably, not yet tested) On a non-decr_pc_after_break machine
496 with hardware or kernel single-step:
497 If we single-step over a breakpoint instruction, our PC will
498 point at the following instruction. If we continue and hit a
499 breakpoint instruction, our PC will point at the breakpoint
503 get_stop_pc (struct lwp_info
*lwp
)
507 if (the_low_target
.get_pc
== NULL
)
510 stop_pc
= get_pc (lwp
);
512 if (WSTOPSIG (lwp
->last_status
) == SIGTRAP
514 && !lwp
->stopped_by_watchpoint
515 && !linux_is_extended_waitstatus (lwp
->last_status
))
516 stop_pc
-= the_low_target
.decr_pc_after_break
;
519 debug_printf ("stop pc is 0x%lx\n", (long) stop_pc
);
524 static struct lwp_info
*
525 add_lwp (ptid_t ptid
)
527 struct lwp_info
*lwp
;
529 lwp
= (struct lwp_info
*) xmalloc (sizeof (*lwp
));
530 memset (lwp
, 0, sizeof (*lwp
));
532 if (the_low_target
.new_thread
!= NULL
)
533 lwp
->arch_private
= the_low_target
.new_thread ();
535 lwp
->thread
= add_thread (ptid
, lwp
);
540 /* Start an inferior process and returns its pid.
541 ALLARGS is a vector of program-name and args. */
544 linux_create_inferior (char *program
, char **allargs
)
546 #ifdef HAVE_PERSONALITY
547 int personality_orig
= 0, personality_set
= 0;
549 struct lwp_info
*new_lwp
;
553 #ifdef HAVE_PERSONALITY
554 if (disable_randomization
)
557 personality_orig
= personality (0xffffffff);
558 if (errno
== 0 && !(personality_orig
& ADDR_NO_RANDOMIZE
))
561 personality (personality_orig
| ADDR_NO_RANDOMIZE
);
563 if (errno
!= 0 || (personality_set
564 && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE
)))
565 warning ("Error disabling address space randomization: %s",
570 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
576 perror_with_name ("fork");
581 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
583 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
584 signal (__SIGRTMIN
+ 1, SIG_DFL
);
589 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
590 stdout to stderr so that inferior i/o doesn't corrupt the connection.
591 Also, redirect stdin to /dev/null. */
592 if (remote_connection_is_stdio ())
595 open ("/dev/null", O_RDONLY
);
597 if (write (2, "stdin/stdout redirected\n",
598 sizeof ("stdin/stdout redirected\n") - 1) < 0)
600 /* Errors ignored. */;
604 execv (program
, allargs
);
606 execvp (program
, allargs
);
608 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
614 #ifdef HAVE_PERSONALITY
618 personality (personality_orig
);
620 warning ("Error restoring address space randomization: %s",
625 linux_add_process (pid
, 0);
627 ptid
= ptid_build (pid
, pid
, 0);
628 new_lwp
= add_lwp (ptid
);
629 new_lwp
->must_set_ptrace_flags
= 1;
635 linux_attach_fail_reason_string (ptid_t ptid
, int err
)
637 static char *reason_string
;
638 struct buffer buffer
;
640 long lwpid
= ptid_get_lwp (ptid
);
642 xfree (reason_string
);
644 buffer_init (&buffer
);
645 linux_ptrace_attach_fail_reason (lwpid
, &buffer
);
646 buffer_grow_str0 (&buffer
, "");
647 warnings
= buffer_finish (&buffer
);
648 if (warnings
[0] != '\0')
649 reason_string
= xstrprintf ("%s (%d), %s",
650 strerror (err
), err
, warnings
);
652 reason_string
= xstrprintf ("%s (%d)",
653 strerror (err
), err
);
655 return reason_string
;
658 /* Attach to an inferior process. */
661 linux_attach_lwp (ptid_t ptid
)
663 struct lwp_info
*new_lwp
;
664 int lwpid
= ptid_get_lwp (ptid
);
666 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
670 new_lwp
= add_lwp (ptid
);
672 /* We need to wait for SIGSTOP before being able to make the next
673 ptrace call on this LWP. */
674 new_lwp
->must_set_ptrace_flags
= 1;
676 if (linux_proc_pid_is_stopped (lwpid
))
679 debug_printf ("Attached to a stopped process\n");
681 /* The process is definitely stopped. It is in a job control
682 stop, unless the kernel predates the TASK_STOPPED /
683 TASK_TRACED distinction, in which case it might be in a
684 ptrace stop. Make sure it is in a ptrace stop; from there we
685 can kill it, signal it, et cetera.
687 First make sure there is a pending SIGSTOP. Since we are
688 already attached, the process can not transition from stopped
689 to running without a PTRACE_CONT; so we know this signal will
690 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
691 probably already in the queue (unless this kernel is old
692 enough to use TASK_STOPPED for ptrace stops); but since
693 SIGSTOP is not an RT signal, it can only be queued once. */
694 kill_lwp (lwpid
, SIGSTOP
);
696 /* Finally, resume the stopped process. This will deliver the
697 SIGSTOP (or a higher priority signal, just like normal
698 PTRACE_ATTACH), which we'll catch later on. */
699 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
702 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
705 There are several cases to consider here:
707 1) gdbserver has already attached to the process and is being notified
708 of a new thread that is being created.
709 In this case we should ignore that SIGSTOP and resume the
710 process. This is handled below by setting stop_expected = 1,
711 and the fact that add_thread sets last_resume_kind ==
714 2) This is the first thread (the process thread), and we're attaching
715 to it via attach_inferior.
716 In this case we want the process thread to stop.
717 This is handled by having linux_attach set last_resume_kind ==
718 resume_stop after we return.
720 If the pid we are attaching to is also the tgid, we attach to and
721 stop all the existing threads. Otherwise, we attach to pid and
722 ignore any other threads in the same group as this pid.
724 3) GDB is connecting to gdbserver and is requesting an enumeration of all
726 In this case we want the thread to stop.
727 FIXME: This case is currently not properly handled.
728 We should wait for the SIGSTOP but don't. Things work apparently
729 because enough time passes between when we ptrace (ATTACH) and when
730 gdb makes the next ptrace call on the thread.
732 On the other hand, if we are currently trying to stop all threads, we
733 should treat the new thread as if we had sent it a SIGSTOP. This works
734 because we are guaranteed that the add_lwp call above added us to the
735 end of the list, and so the new thread has not yet reached
736 wait_for_sigstop (but will). */
737 new_lwp
->stop_expected
= 1;
742 /* Attach to PID. If PID is the tgid, attach to it and all
746 linux_attach (unsigned long pid
)
748 ptid_t ptid
= ptid_build (pid
, pid
, 0);
751 /* Attach to PID. We will check for other threads
753 err
= linux_attach_lwp (ptid
);
755 error ("Cannot attach to process %ld: %s",
756 pid
, linux_attach_fail_reason_string (ptid
, err
));
758 linux_add_process (pid
, 1);
762 struct thread_info
*thread
;
764 /* Don't ignore the initial SIGSTOP if we just attached to this
765 process. It will be collected by wait shortly. */
766 thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
767 thread
->last_resume_kind
= resume_stop
;
770 if (linux_proc_get_tgid (pid
) == pid
)
775 sprintf (pathname
, "/proc/%ld/task", pid
);
777 dir
= opendir (pathname
);
781 fprintf (stderr
, "Could not open /proc/%ld/task.\n", pid
);
786 /* At this point we attached to the tgid. Scan the task for
788 int new_threads_found
;
791 while (iterations
< 2)
795 new_threads_found
= 0;
796 /* Add all the other threads. While we go through the
797 threads, new threads may be spawned. Cycle through
798 the list of threads until we have done two iterations without
799 finding new threads. */
800 while ((dp
= readdir (dir
)) != NULL
)
806 lwp
= strtoul (dp
->d_name
, NULL
, 10);
808 ptid
= ptid_build (pid
, lwp
, 0);
810 /* Is this a new thread? */
811 if (lwp
!= 0 && find_thread_ptid (ptid
) == NULL
)
816 debug_printf ("Found new lwp %ld\n", lwp
);
818 err
= linux_attach_lwp (ptid
);
820 warning ("Cannot attach to lwp %ld: %s",
822 linux_attach_fail_reason_string (ptid
, err
));
828 if (!new_threads_found
)
849 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
851 struct counter
*counter
= args
;
853 if (ptid_get_pid (entry
->id
) == counter
->pid
)
855 if (++counter
->count
> 1)
863 last_thread_of_process_p (int pid
)
865 struct counter counter
= { pid
, 0 };
867 return (find_inferior (&all_threads
,
868 second_thread_of_pid_p
, &counter
) == NULL
);
874 linux_kill_one_lwp (struct lwp_info
*lwp
)
876 struct thread_info
*thr
= get_lwp_thread (lwp
);
877 int pid
= lwpid_of (thr
);
879 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
880 there is no signal context, and ptrace(PTRACE_KILL) (or
881 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
882 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
883 alternative is to kill with SIGKILL. We only need one SIGKILL
884 per process, not one for each thread. But since we still support
885 linuxthreads, and we also support debugging programs using raw
886 clone without CLONE_THREAD, we send one for each thread. For
887 years, we used PTRACE_KILL only, so we're being a bit paranoid
888 about some old kernels where PTRACE_KILL might work better
889 (dubious if there are any such, but that's why it's paranoia), so
890 we try SIGKILL first, PTRACE_KILL second, and so we're fine
894 kill_lwp (pid
, SIGKILL
);
897 int save_errno
= errno
;
899 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
900 target_pid_to_str (ptid_of (thr
)),
901 save_errno
? strerror (save_errno
) : "OK");
905 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
908 int save_errno
= errno
;
910 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
911 target_pid_to_str (ptid_of (thr
)),
912 save_errno
? strerror (save_errno
) : "OK");
916 /* Kill LWP and wait for it to die. */
919 kill_wait_lwp (struct lwp_info
*lwp
)
921 struct thread_info
*thr
= get_lwp_thread (lwp
);
922 int pid
= ptid_get_pid (ptid_of (thr
));
923 int lwpid
= ptid_get_lwp (ptid_of (thr
));
928 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
932 linux_kill_one_lwp (lwp
);
934 /* Make sure it died. Notes:
936 - The loop is most likely unnecessary.
938 - We don't use linux_wait_for_event as that could delete lwps
939 while we're iterating over them. We're not interested in
940 any pending status at this point, only in making sure all
941 wait status on the kernel side are collected until the
944 - We don't use __WALL here as the __WALL emulation relies on
945 SIGCHLD, and killing a stopped process doesn't generate
946 one, nor an exit status.
948 res
= my_waitpid (lwpid
, &wstat
, 0);
949 if (res
== -1 && errno
== ECHILD
)
950 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
951 } while (res
> 0 && WIFSTOPPED (wstat
));
953 gdb_assert (res
> 0);
956 /* Callback for `find_inferior'. Kills an lwp of a given process,
957 except the leader. */
960 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
962 struct thread_info
*thread
= (struct thread_info
*) entry
;
963 struct lwp_info
*lwp
= get_thread_lwp (thread
);
964 int pid
= * (int *) args
;
966 if (ptid_get_pid (entry
->id
) != pid
)
969 /* We avoid killing the first thread here, because of a Linux kernel (at
970 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
971 the children get a chance to be reaped, it will remain a zombie
974 if (lwpid_of (thread
) == pid
)
977 debug_printf ("lkop: is last of process %s\n",
978 target_pid_to_str (entry
->id
));
989 struct process_info
*process
;
990 struct lwp_info
*lwp
;
992 process
= find_process_pid (pid
);
996 /* If we're killing a running inferior, make sure it is stopped
997 first, as PTRACE_KILL will not work otherwise. */
998 stop_all_lwps (0, NULL
);
1000 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1002 /* See the comment in linux_kill_one_lwp. We did not kill the first
1003 thread in the list, so do so now. */
1004 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1009 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1013 kill_wait_lwp (lwp
);
1015 the_target
->mourn (process
);
1017 /* Since we presently can only stop all lwps of all processes, we
1018 need to unstop lwps of other processes. */
1019 unstop_all_lwps (0, NULL
);
1023 /* Get pending signal of THREAD, for detaching purposes. This is the
1024 signal the thread last stopped for, which we need to deliver to the
1025 thread when detaching, otherwise, it'd be suppressed/lost. */
1028 get_detach_signal (struct thread_info
*thread
)
1030 enum gdb_signal signo
= GDB_SIGNAL_0
;
1032 struct lwp_info
*lp
= get_thread_lwp (thread
);
1034 if (lp
->status_pending_p
)
1035 status
= lp
->status_pending
;
1038 /* If the thread had been suspended by gdbserver, and it stopped
1039 cleanly, then it'll have stopped with SIGSTOP. But we don't
1040 want to deliver that SIGSTOP. */
1041 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1042 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1045 /* Otherwise, we may need to deliver the signal we
1047 status
= lp
->last_status
;
1050 if (!WIFSTOPPED (status
))
1053 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1054 target_pid_to_str (ptid_of (thread
)));
1058 /* Extended wait statuses aren't real SIGTRAPs. */
1059 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1062 debug_printf ("GPS: lwp %s had stopped with extended "
1063 "status: no pending signal\n",
1064 target_pid_to_str (ptid_of (thread
)));
1068 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1070 if (program_signals_p
&& !program_signals
[signo
])
1073 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1074 target_pid_to_str (ptid_of (thread
)),
1075 gdb_signal_to_string (signo
));
1078 else if (!program_signals_p
1079 /* If we have no way to know which signals GDB does not
1080 want to have passed to the program, assume
1081 SIGTRAP/SIGINT, which is GDB's default. */
1082 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1085 debug_printf ("GPS: lwp %s had signal %s, "
1086 "but we don't know if we should pass it. "
1087 "Default to not.\n",
1088 target_pid_to_str (ptid_of (thread
)),
1089 gdb_signal_to_string (signo
));
1095 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1096 target_pid_to_str (ptid_of (thread
)),
1097 gdb_signal_to_string (signo
));
1099 return WSTOPSIG (status
);
1104 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
1106 struct thread_info
*thread
= (struct thread_info
*) entry
;
1107 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1108 int pid
= * (int *) args
;
1111 if (ptid_get_pid (entry
->id
) != pid
)
1114 /* If there is a pending SIGSTOP, get rid of it. */
1115 if (lwp
->stop_expected
)
1118 debug_printf ("Sending SIGCONT to %s\n",
1119 target_pid_to_str (ptid_of (thread
)));
1121 kill_lwp (lwpid_of (thread
), SIGCONT
);
1122 lwp
->stop_expected
= 0;
1125 /* Flush any pending changes to the process's registers. */
1126 regcache_invalidate_thread (thread
);
1128 /* Pass on any pending signal for this thread. */
1129 sig
= get_detach_signal (thread
);
1131 /* Finally, let it resume. */
1132 if (the_low_target
.prepare_to_resume
!= NULL
)
1133 the_low_target
.prepare_to_resume (lwp
);
1134 if (ptrace (PTRACE_DETACH
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1135 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1136 error (_("Can't detach %s: %s"),
1137 target_pid_to_str (ptid_of (thread
)),
1145 linux_detach (int pid
)
1147 struct process_info
*process
;
1149 process
= find_process_pid (pid
);
1150 if (process
== NULL
)
1153 /* Stop all threads before detaching. First, ptrace requires that
1154 the thread is stopped to sucessfully detach. Second, thread_db
1155 may need to uninstall thread event breakpoints from memory, which
1156 only works with a stopped process anyway. */
1157 stop_all_lwps (0, NULL
);
1159 #ifdef USE_THREAD_DB
1160 thread_db_detach (process
);
1163 /* Stabilize threads (move out of jump pads). */
1164 stabilize_threads ();
1166 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
1168 the_target
->mourn (process
);
1170 /* Since we presently can only stop all lwps of all processes, we
1171 need to unstop lwps of other processes. */
1172 unstop_all_lwps (0, NULL
);
1176 /* Remove all LWPs that belong to process PROC from the lwp list. */
1179 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1181 struct thread_info
*thread
= (struct thread_info
*) entry
;
1182 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1183 struct process_info
*process
= proc
;
1185 if (pid_of (thread
) == pid_of (process
))
1192 linux_mourn (struct process_info
*process
)
1194 struct process_info_private
*priv
;
1196 #ifdef USE_THREAD_DB
1197 thread_db_mourn (process
);
1200 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1202 /* Freeing all private data. */
1203 priv
= process
->private;
1204 free (priv
->arch_private
);
1206 process
->private = NULL
;
1208 remove_process (process
);
1212 linux_join (int pid
)
1217 ret
= my_waitpid (pid
, &status
, 0);
1218 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1220 } while (ret
!= -1 || errno
!= ECHILD
);
1223 /* Return nonzero if the given thread is still alive. */
1225 linux_thread_alive (ptid_t ptid
)
1227 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1229 /* We assume we always know if a thread exits. If a whole process
1230 exited but we still haven't been able to report it to GDB, we'll
1231 hold on to the last lwp of the dead process. */
1238 /* Return 1 if this lwp has an interesting status pending. */
1240 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1242 struct thread_info
*thread
= (struct thread_info
*) entry
;
1243 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1244 ptid_t ptid
= * (ptid_t
*) arg
;
1246 /* Check if we're only interested in events from a specific process
1248 if (!ptid_equal (minus_one_ptid
, ptid
)
1249 && ptid_get_pid (ptid
) != ptid_get_pid (thread
->entry
.id
))
1252 /* If we got a `vCont;t', but we haven't reported a stop yet, do
1253 report any status pending the LWP may have. */
1254 if (thread
->last_resume_kind
== resume_stop
1255 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
1258 return lwp
->status_pending_p
;
1262 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1264 ptid_t ptid
= *(ptid_t
*) data
;
1267 if (ptid_get_lwp (ptid
) != 0)
1268 lwp
= ptid_get_lwp (ptid
);
1270 lwp
= ptid_get_pid (ptid
);
1272 if (ptid_get_lwp (entry
->id
) == lwp
)
1279 find_lwp_pid (ptid_t ptid
)
1281 struct inferior_list_entry
*thread
1282 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1287 return get_thread_lwp ((struct thread_info
*) thread
);
1290 /* Return the number of known LWPs in the tgid given by PID. */
1295 struct inferior_list_entry
*inf
, *tmp
;
1298 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1300 if (ptid_get_pid (inf
->id
) == pid
)
1307 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1308 their exits until all other threads in the group have exited. */
1311 check_zombie_leaders (void)
1313 struct process_info
*proc
, *tmp
;
1315 ALL_PROCESSES (proc
, tmp
)
1317 pid_t leader_pid
= pid_of (proc
);
1318 struct lwp_info
*leader_lp
;
1320 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1323 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1324 "num_lwps=%d, zombie=%d\n",
1325 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1326 linux_proc_pid_is_zombie (leader_pid
));
1328 if (leader_lp
!= NULL
1329 /* Check if there are other threads in the group, as we may
1330 have raced with the inferior simply exiting. */
1331 && !last_thread_of_process_p (leader_pid
)
1332 && linux_proc_pid_is_zombie (leader_pid
))
1334 /* A leader zombie can mean one of two things:
1336 - It exited, and there's an exit status pending
1337 available, or only the leader exited (not the whole
1338 program). In the latter case, we can't waitpid the
1339 leader's exit status until all other threads are gone.
1341 - There are 3 or more threads in the group, and a thread
1342 other than the leader exec'd. On an exec, the Linux
1343 kernel destroys all other threads (except the execing
1344 one) in the thread group, and resets the execing thread's
1345 tid to the tgid. No exit notification is sent for the
1346 execing thread -- from the ptracer's perspective, it
1347 appears as though the execing thread just vanishes.
1348 Until we reap all other threads except the leader and the
1349 execing thread, the leader will be zombie, and the
1350 execing thread will be in `D (disc sleep)'. As soon as
1351 all other threads are reaped, the execing thread changes
1352 it's tid to the tgid, and the previous (zombie) leader
1353 vanishes, giving place to the "new" leader. We could try
1354 distinguishing the exit and exec cases, by waiting once
1355 more, and seeing if something comes out, but it doesn't
1356 sound useful. The previous leader _does_ go away, and
1357 we'll re-add the new one once we see the exec event
1358 (which is just the same as what would happen if the
1359 previous leader did exit voluntarily before some other
1364 "CZL: Thread group leader %d zombie "
1365 "(it exited, or another thread execd).\n",
1368 delete_lwp (leader_lp
);
1373 /* Callback for `find_inferior'. Returns the first LWP that is not
1374 stopped. ARG is a PTID filter. */
1377 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
1379 struct thread_info
*thr
= (struct thread_info
*) entry
;
1380 struct lwp_info
*lwp
;
1381 ptid_t filter
= *(ptid_t
*) arg
;
1383 if (!ptid_match (ptid_of (thr
), filter
))
1386 lwp
= get_thread_lwp (thr
);
1393 /* This function should only be called if the LWP got a SIGTRAP.
1395 Handle any tracepoint steps or hits. Return true if a tracepoint
1396 event was handled, 0 otherwise. */
1399 handle_tracepoints (struct lwp_info
*lwp
)
1401 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1402 int tpoint_related_event
= 0;
1404 /* If this tracepoint hit causes a tracing stop, we'll immediately
1405 uninsert tracepoints. To do this, we temporarily pause all
1406 threads, unpatch away, and then unpause threads. We need to make
1407 sure the unpausing doesn't resume LWP too. */
1410 /* And we need to be sure that any all-threads-stopping doesn't try
1411 to move threads out of the jump pads, as it could deadlock the
1412 inferior (LWP could be in the jump pad, maybe even holding the
1415 /* Do any necessary step collect actions. */
1416 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1418 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1420 /* See if we just hit a tracepoint and do its main collect
1422 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1426 gdb_assert (lwp
->suspended
== 0);
1427 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
1429 if (tpoint_related_event
)
1432 debug_printf ("got a tracepoint event\n");
1439 /* Convenience wrapper. Returns true if LWP is presently collecting a
1443 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
1444 struct fast_tpoint_collect_status
*status
)
1446 CORE_ADDR thread_area
;
1447 struct thread_info
*thread
= get_lwp_thread (lwp
);
1449 if (the_low_target
.get_thread_area
== NULL
)
1452 /* Get the thread area address. This is used to recognize which
1453 thread is which when tracing with the in-process agent library.
1454 We don't read anything from the address, and treat it as opaque;
1455 it's the address itself that we assume is unique per-thread. */
1456 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
1459 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1462 /* The reason we resume in the caller, is because we want to be able
1463 to pass lwp->status_pending as WSTAT, and we need to clear
1464 status_pending_p before resuming, otherwise, linux_resume_one_lwp
1465 refuses to resume. */
1468 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
1470 struct thread_info
*saved_thread
;
1472 saved_thread
= current_thread
;
1473 current_thread
= get_lwp_thread (lwp
);
1476 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
1477 && supports_fast_tracepoints ()
1478 && agent_loaded_p ())
1480 struct fast_tpoint_collect_status status
;
1484 debug_printf ("Checking whether LWP %ld needs to move out of the "
1486 lwpid_of (current_thread
));
1488 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
1491 || (WSTOPSIG (*wstat
) != SIGILL
1492 && WSTOPSIG (*wstat
) != SIGFPE
1493 && WSTOPSIG (*wstat
) != SIGSEGV
1494 && WSTOPSIG (*wstat
) != SIGBUS
))
1496 lwp
->collecting_fast_tracepoint
= r
;
1500 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
1502 /* Haven't executed the original instruction yet.
1503 Set breakpoint there, and wait till it's hit,
1504 then single-step until exiting the jump pad. */
1505 lwp
->exit_jump_pad_bkpt
1506 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
1510 debug_printf ("Checking whether LWP %ld needs to move out of "
1511 "the jump pad...it does\n",
1512 lwpid_of (current_thread
));
1513 current_thread
= saved_thread
;
1520 /* If we get a synchronous signal while collecting, *and*
1521 while executing the (relocated) original instruction,
1522 reset the PC to point at the tpoint address, before
1523 reporting to GDB. Otherwise, it's an IPA lib bug: just
1524 report the signal to GDB, and pray for the best. */
1526 lwp
->collecting_fast_tracepoint
= 0;
1529 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
1530 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
1533 struct regcache
*regcache
;
1535 /* The si_addr on a few signals references the address
1536 of the faulting instruction. Adjust that as
1538 if ((WSTOPSIG (*wstat
) == SIGILL
1539 || WSTOPSIG (*wstat
) == SIGFPE
1540 || WSTOPSIG (*wstat
) == SIGBUS
1541 || WSTOPSIG (*wstat
) == SIGSEGV
)
1542 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
1543 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
1544 /* Final check just to make sure we don't clobber
1545 the siginfo of non-kernel-sent signals. */
1546 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
1548 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
1549 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
1550 (PTRACE_TYPE_ARG3
) 0, &info
);
1553 regcache
= get_thread_regcache (current_thread
, 1);
1554 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
1555 lwp
->stop_pc
= status
.tpoint_addr
;
1557 /* Cancel any fast tracepoint lock this thread was
1559 force_unlock_trace_buffer ();
1562 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
1565 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
1566 "stopping all threads momentarily.\n");
1568 stop_all_lwps (1, lwp
);
1569 cancel_breakpoints ();
1571 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
1572 lwp
->exit_jump_pad_bkpt
= NULL
;
1574 unstop_all_lwps (1, lwp
);
1576 gdb_assert (lwp
->suspended
>= 0);
1582 debug_printf ("Checking whether LWP %ld needs to move out of the "
1584 lwpid_of (current_thread
));
1586 current_thread
= saved_thread
;
1590 /* Enqueue one signal in the "signals to report later when out of the
1594 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1596 struct pending_signals
*p_sig
;
1597 struct thread_info
*thread
= get_lwp_thread (lwp
);
1600 debug_printf ("Deferring signal %d for LWP %ld.\n",
1601 WSTOPSIG (*wstat
), lwpid_of (thread
));
1605 struct pending_signals
*sig
;
1607 for (sig
= lwp
->pending_signals_to_report
;
1610 debug_printf (" Already queued %d\n",
1613 debug_printf (" (no more currently queued signals)\n");
1616 /* Don't enqueue non-RT signals if they are already in the deferred
1617 queue. (SIGSTOP being the easiest signal to see ending up here
1619 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
1621 struct pending_signals
*sig
;
1623 for (sig
= lwp
->pending_signals_to_report
;
1627 if (sig
->signal
== WSTOPSIG (*wstat
))
1630 debug_printf ("Not requeuing already queued non-RT signal %d"
1639 p_sig
= xmalloc (sizeof (*p_sig
));
1640 p_sig
->prev
= lwp
->pending_signals_to_report
;
1641 p_sig
->signal
= WSTOPSIG (*wstat
);
1642 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
1643 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1646 lwp
->pending_signals_to_report
= p_sig
;
1649 /* Dequeue one signal from the "signals to report later when out of
1650 the jump pad" list. */
1653 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1655 struct thread_info
*thread
= get_lwp_thread (lwp
);
1657 if (lwp
->pending_signals_to_report
!= NULL
)
1659 struct pending_signals
**p_sig
;
1661 p_sig
= &lwp
->pending_signals_to_report
;
1662 while ((*p_sig
)->prev
!= NULL
)
1663 p_sig
= &(*p_sig
)->prev
;
1665 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
1666 if ((*p_sig
)->info
.si_signo
!= 0)
1667 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1673 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
1674 WSTOPSIG (*wstat
), lwpid_of (thread
));
1678 struct pending_signals
*sig
;
1680 for (sig
= lwp
->pending_signals_to_report
;
1683 debug_printf (" Still queued %d\n",
1686 debug_printf (" (no more queued signals)\n");
1695 /* Arrange for a breakpoint to be hit again later. We don't keep the
1696 SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We
1697 will handle the current event, eventually we will resume this LWP,
1698 and this breakpoint will trap again. */
1701 cancel_breakpoint (struct lwp_info
*lwp
)
1703 struct thread_info
*saved_thread
;
1705 /* There's nothing to do if we don't support breakpoints. */
1706 if (!supports_breakpoints ())
1709 /* breakpoint_at reads from current inferior. */
1710 saved_thread
= current_thread
;
1711 current_thread
= get_lwp_thread (lwp
);
1713 if ((*the_low_target
.breakpoint_at
) (lwp
->stop_pc
))
1716 debug_printf ("CB: Push back breakpoint for %s\n",
1717 target_pid_to_str (ptid_of (current_thread
)));
1719 /* Back up the PC if necessary. */
1720 if (the_low_target
.decr_pc_after_break
)
1722 struct regcache
*regcache
1723 = get_thread_regcache (current_thread
, 1);
1724 (*the_low_target
.set_pc
) (regcache
, lwp
->stop_pc
);
1727 current_thread
= saved_thread
;
1733 debug_printf ("CB: No breakpoint found at %s for [%s]\n",
1734 paddress (lwp
->stop_pc
),
1735 target_pid_to_str (ptid_of (current_thread
)));
1738 current_thread
= saved_thread
;
1742 /* Return true if the event in LP may be caused by breakpoint. */
1745 lp_status_maybe_breakpoint (struct lwp_info
*lp
)
1747 return (lp
->status_pending_p
1748 && WIFSTOPPED (lp
->status_pending
)
1749 && (WSTOPSIG (lp
->status_pending
) == SIGTRAP
1750 /* SIGILL and SIGSEGV are also treated as traps in case a
1751 breakpoint is inserted at the current PC. */
1752 || WSTOPSIG (lp
->status_pending
) == SIGILL
1753 || WSTOPSIG (lp
->status_pending
) == SIGSEGV
));
1756 /* Do low-level handling of the event, and check if we should go on
1757 and pass it to caller code. Return the affected lwp if we are, or
1760 static struct lwp_info
*
1761 linux_low_filter_event (ptid_t filter_ptid
, int lwpid
, int wstat
)
1763 struct lwp_info
*child
;
1764 struct thread_info
*thread
;
1766 child
= find_lwp_pid (pid_to_ptid (lwpid
));
1768 /* If we didn't find a process, one of two things presumably happened:
1769 - A process we started and then detached from has exited. Ignore it.
1770 - A process we are controlling has forked and the new child's stop
1771 was reported to us by the kernel. Save its PID. */
1772 if (child
== NULL
&& WIFSTOPPED (wstat
))
1774 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
1777 else if (child
== NULL
)
1780 thread
= get_lwp_thread (child
);
1784 child
->last_status
= wstat
;
1786 if (WIFSTOPPED (wstat
))
1788 struct process_info
*proc
;
1790 /* Architecture-specific setup after inferior is running. This
1791 needs to happen after we have attached to the inferior and it
1792 is stopped for the first time, but before we access any
1793 inferior registers. */
1794 proc
= find_process_pid (pid_of (thread
));
1795 if (proc
->private->new_inferior
)
1797 struct thread_info
*saved_thread
;
1799 saved_thread
= current_thread
;
1800 current_thread
= thread
;
1802 the_low_target
.arch_setup ();
1804 current_thread
= saved_thread
;
1806 proc
->private->new_inferior
= 0;
1810 /* Store the STOP_PC, with adjustment applied. This depends on the
1811 architecture being defined already (so that CHILD has a valid
1812 regcache), and on LAST_STATUS being set (to check for SIGTRAP or
1814 if (WIFSTOPPED (wstat
))
1817 && the_low_target
.get_pc
!= NULL
)
1819 struct thread_info
*saved_thread
;
1820 struct regcache
*regcache
;
1823 saved_thread
= current_thread
;
1824 current_thread
= thread
;
1825 regcache
= get_thread_regcache (current_thread
, 1);
1826 pc
= (*the_low_target
.get_pc
) (regcache
);
1827 debug_printf ("linux_low_filter_event: pc is 0x%lx\n", (long) pc
);
1828 current_thread
= saved_thread
;
1831 child
->stop_pc
= get_stop_pc (child
);
1834 /* Fetch the possibly triggered data watchpoint info and store it in
1837 On some archs, like x86, that use debug registers to set
1838 watchpoints, it's possible that the way to know which watched
1839 address trapped, is to check the register that is used to select
1840 which address to watch. Problem is, between setting the
1841 watchpoint and reading back which data address trapped, the user
1842 may change the set of watchpoints, and, as a consequence, GDB
1843 changes the debug registers in the inferior. To avoid reading
1844 back a stale stopped-data-address when that happens, we cache in
1845 LP the fact that a watchpoint trapped, and the corresponding data
1846 address, as soon as we see CHILD stop with a SIGTRAP. If GDB
1847 changes the debug registers meanwhile, we have the cached data we
1850 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
)
1852 if (the_low_target
.stopped_by_watchpoint
== NULL
)
1854 child
->stopped_by_watchpoint
= 0;
1858 struct thread_info
*saved_thread
;
1860 saved_thread
= current_thread
;
1861 current_thread
= thread
;
1863 child
->stopped_by_watchpoint
1864 = the_low_target
.stopped_by_watchpoint ();
1866 if (child
->stopped_by_watchpoint
)
1868 if (the_low_target
.stopped_data_address
!= NULL
)
1869 child
->stopped_data_address
1870 = the_low_target
.stopped_data_address ();
1872 child
->stopped_data_address
= 0;
1875 current_thread
= saved_thread
;
1879 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
1881 struct process_info
*proc
= find_process_pid (pid_of (thread
));
1883 linux_enable_event_reporting (lwpid
, proc
->attached
);
1884 child
->must_set_ptrace_flags
= 0;
1887 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
1888 && linux_is_extended_waitstatus (wstat
))
1890 handle_extended_wait (child
, wstat
);
1894 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
1895 && child
->stop_expected
)
1898 debug_printf ("Expected stop.\n");
1899 child
->stop_expected
= 0;
1901 if (thread
->last_resume_kind
== resume_stop
)
1903 /* We want to report the stop to the core. Treat the
1904 SIGSTOP as a normal event. */
1906 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
1908 /* Stopping threads. We don't want this SIGSTOP to end up
1909 pending in the FILTER_PTID handling below. */
1914 /* Filter out the event. */
1915 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
1920 /* Check if the thread has exited. */
1921 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
))
1922 && num_lwps (pid_of (thread
)) > 1)
1925 debug_printf ("LLW: %d exited.\n", lwpid
);
1927 /* If there is at least one more LWP, then the exit signal
1928 was not the end of the debugged application and should be
1934 if (!ptid_match (ptid_of (thread
), filter_ptid
))
1937 debug_printf ("LWP %d got an event %06x, leaving pending.\n",
1940 if (WIFSTOPPED (wstat
))
1942 child
->status_pending_p
= 1;
1943 child
->status_pending
= wstat
;
1945 if (WSTOPSIG (wstat
) != SIGSTOP
)
1947 /* Cancel breakpoint hits. The breakpoint may be
1948 removed before we fetch events from this process to
1949 report to the core. It is best not to assume the
1950 moribund breakpoints heuristic always handles these
1951 cases --- it could be too many events go through to
1952 the core before this one is handled. All-stop always
1953 cancels breakpoint hits in all threads. */
1955 && lp_status_maybe_breakpoint (child
)
1956 && cancel_breakpoint (child
))
1958 /* Throw away the SIGTRAP. */
1959 child
->status_pending_p
= 0;
1962 debug_printf ("LLW: LWP %d hit a breakpoint while"
1963 " waiting for another process;"
1964 " cancelled it\n", lwpid
);
1968 else if (WIFEXITED (wstat
) || WIFSIGNALED (wstat
))
1971 debug_printf ("LLWE: process %d exited while fetching "
1972 "event from another LWP\n", lwpid
);
1974 /* This was the last lwp in the process. Since events are
1975 serialized to GDB core, and we can't report this one
1976 right now, but GDB core and the other target layers will
1977 want to be notified about the exit code/signal, leave the
1978 status pending for the next time we're able to report
1980 mark_lwp_dead (child
, wstat
);
1989 /* When the event-loop is doing a step-over, this points at the thread
1991 ptid_t step_over_bkpt
;
1993 /* Wait for an event from child(ren) WAIT_PTID, and return any that
1994 match FILTER_PTID (leaving others pending). The PTIDs can be:
1995 minus_one_ptid, to specify any child; a pid PTID, specifying all
1996 lwps of a thread group; or a PTID representing a single lwp. Store
1997 the stop status through the status pointer WSTAT. OPTIONS is
1998 passed to the waitpid call. Return 0 if no event was found and
1999 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2000 was found. Return the PID of the stopped child otherwise. */
2003 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2004 int *wstatp
, int options
)
2006 struct thread_info
*event_thread
;
2007 struct lwp_info
*event_child
, *requested_child
;
2008 sigset_t block_mask
, prev_mask
;
2011 /* N.B. event_thread points to the thread_info struct that contains
2012 event_child. Keep them in sync. */
2013 event_thread
= NULL
;
2015 requested_child
= NULL
;
2017 /* Check for a lwp with a pending status. */
2019 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2021 event_thread
= (struct thread_info
*)
2022 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2023 if (event_thread
!= NULL
)
2024 event_child
= get_thread_lwp (event_thread
);
2025 if (debug_threads
&& event_thread
)
2026 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2028 else if (!ptid_equal (filter_ptid
, null_ptid
))
2030 requested_child
= find_lwp_pid (filter_ptid
);
2032 if (stopping_threads
== NOT_STOPPING_THREADS
2033 && requested_child
->status_pending_p
2034 && requested_child
->collecting_fast_tracepoint
)
2036 enqueue_one_deferred_signal (requested_child
,
2037 &requested_child
->status_pending
);
2038 requested_child
->status_pending_p
= 0;
2039 requested_child
->status_pending
= 0;
2040 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2043 if (requested_child
->suspended
2044 && requested_child
->status_pending_p
)
2046 internal_error (__FILE__
, __LINE__
,
2047 "requesting an event out of a"
2048 " suspended child?");
2051 if (requested_child
->status_pending_p
)
2053 event_child
= requested_child
;
2054 event_thread
= get_lwp_thread (event_child
);
2058 if (event_child
!= NULL
)
2061 debug_printf ("Got an event from pending child %ld (%04x)\n",
2062 lwpid_of (event_thread
), event_child
->status_pending
);
2063 *wstatp
= event_child
->status_pending
;
2064 event_child
->status_pending_p
= 0;
2065 event_child
->status_pending
= 0;
2066 current_thread
= event_thread
;
2067 return lwpid_of (event_thread
);
2070 /* But if we don't find a pending event, we'll have to wait.
2072 We only enter this loop if no process has a pending wait status.
2073 Thus any action taken in response to a wait status inside this
2074 loop is responding as soon as we detect the status, not after any
2077 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2078 all signals while here. */
2079 sigfillset (&block_mask
);
2080 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2082 while (event_child
== NULL
)
2086 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2089 - If the thread group leader exits while other threads in the
2090 thread group still exist, waitpid(TGID, ...) hangs. That
2091 waitpid won't return an exit status until the other threads
2092 in the group are reaped.
2094 - When a non-leader thread execs, that thread just vanishes
2095 without reporting an exit (so we'd hang if we waited for it
2096 explicitly in that case). The exec event is reported to
2097 the TGID pid (although we don't currently enable exec
2100 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2103 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2104 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2110 debug_printf ("LLW: waitpid %ld received %s\n",
2111 (long) ret
, status_to_str (*wstatp
));
2114 event_child
= linux_low_filter_event (filter_ptid
,
2116 if (event_child
!= NULL
)
2118 /* We got an event to report to the core. */
2119 event_thread
= get_lwp_thread (event_child
);
2123 /* Retry until nothing comes out of waitpid. A single
2124 SIGCHLD can indicate more than one child stopped. */
2128 /* Check for zombie thread group leaders. Those can't be reaped
2129 until all other threads in the thread group are. */
2130 check_zombie_leaders ();
2132 /* If there are no resumed children left in the set of LWPs we
2133 want to wait for, bail. We can't just block in
2134 waitpid/sigsuspend, because lwps might have been left stopped
2135 in trace-stop state, and we'd be stuck forever waiting for
2136 their status to change (which would only happen if we resumed
2137 them). Even if WNOHANG is set, this return code is preferred
2138 over 0 (below), as it is more detailed. */
2139 if ((find_inferior (&all_threads
,
2140 not_stopped_callback
,
2141 &wait_ptid
) == NULL
))
2144 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2145 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2149 /* No interesting event to report to the caller. */
2150 if ((options
& WNOHANG
))
2153 debug_printf ("WNOHANG set, no event found\n");
2155 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2159 /* Block until we get an event reported with SIGCHLD. */
2161 debug_printf ("sigsuspend'ing\n");
2163 sigsuspend (&prev_mask
);
2164 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2168 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2170 current_thread
= event_thread
;
2172 /* Check for thread exit. */
2173 if (! WIFSTOPPED (*wstatp
))
2175 gdb_assert (last_thread_of_process_p (pid_of (event_thread
)));
2178 debug_printf ("LWP %d is the last lwp of process. "
2179 "Process %ld exiting.\n",
2180 pid_of (event_thread
), lwpid_of (event_thread
));
2181 return lwpid_of (event_thread
);
2184 return lwpid_of (event_thread
);
2187 /* Wait for an event from child(ren) PTID. PTIDs can be:
2188 minus_one_ptid, to specify any child; a pid PTID, specifying all
2189 lwps of a thread group; or a PTID representing a single lwp. Store
2190 the stop status through the status pointer WSTAT. OPTIONS is
2191 passed to the waitpid call. Return 0 if no event was found and
2192 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2193 was found. Return the PID of the stopped child otherwise. */
2196 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2198 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2201 /* Count the LWP's that have had events. */
2204 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2206 struct thread_info
*thread
= (struct thread_info
*) entry
;
2207 struct lwp_info
*lp
= get_thread_lwp (thread
);
2210 gdb_assert (count
!= NULL
);
2212 /* Count only resumed LWPs that have a SIGTRAP event pending that
2213 should be reported to GDB. */
2214 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2215 && thread
->last_resume_kind
!= resume_stop
2216 && lp_status_maybe_breakpoint (lp
)
2217 && !breakpoint_inserted_here (lp
->stop_pc
))
2223 /* Select the LWP (if any) that is currently being single-stepped. */
2226 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2228 struct thread_info
*thread
= (struct thread_info
*) entry
;
2229 struct lwp_info
*lp
= get_thread_lwp (thread
);
2231 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2232 && thread
->last_resume_kind
== resume_step
2233 && lp
->status_pending_p
)
2239 /* Select the Nth LWP that has had a SIGTRAP event that should be
2243 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2245 struct thread_info
*thread
= (struct thread_info
*) entry
;
2246 struct lwp_info
*lp
= get_thread_lwp (thread
);
2247 int *selector
= data
;
2249 gdb_assert (selector
!= NULL
);
2251 /* Select only resumed LWPs that have a SIGTRAP event pending. */
2252 if (thread
->last_resume_kind
!= resume_stop
2253 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2254 && lp_status_maybe_breakpoint (lp
)
2255 && !breakpoint_inserted_here (lp
->stop_pc
))
2256 if ((*selector
)-- == 0)
2263 cancel_breakpoints_callback (struct inferior_list_entry
*entry
, void *data
)
2265 struct thread_info
*thread
= (struct thread_info
*) entry
;
2266 struct lwp_info
*lp
= get_thread_lwp (thread
);
2267 struct lwp_info
*event_lp
= data
;
2269 /* Leave the LWP that has been elected to receive a SIGTRAP alone. */
2273 /* If a LWP other than the LWP that we're reporting an event for has
2274 hit a GDB breakpoint (as opposed to some random trap signal),
2275 then just arrange for it to hit it again later. We don't keep
2276 the SIGTRAP status and don't forward the SIGTRAP signal to the
2277 LWP. We will handle the current event, eventually we will resume
2278 all LWPs, and this one will get its breakpoint trap again.
2280 If we do not do this, then we run the risk that the user will
2281 delete or disable the breakpoint, but the LWP will have already
2284 if (thread
->last_resume_kind
!= resume_stop
2285 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2286 && lp_status_maybe_breakpoint (lp
)
2288 && !lp
->stopped_by_watchpoint
2289 && cancel_breakpoint (lp
))
2290 /* Throw away the SIGTRAP. */
2291 lp
->status_pending_p
= 0;
2297 linux_cancel_breakpoints (void)
2299 find_inferior (&all_threads
, cancel_breakpoints_callback
, NULL
);
2302 /* Select one LWP out of those that have events pending. */
2305 select_event_lwp (struct lwp_info
**orig_lp
)
2308 int random_selector
;
2309 struct thread_info
*event_thread
;
2311 /* Give preference to any LWP that is being single-stepped. */
2313 = (struct thread_info
*) find_inferior (&all_threads
,
2314 select_singlestep_lwp_callback
,
2316 if (event_thread
!= NULL
)
2319 debug_printf ("SEL: Select single-step %s\n",
2320 target_pid_to_str (ptid_of (event_thread
)));
2324 /* No single-stepping LWP. Select one at random, out of those
2325 which have had SIGTRAP events. */
2327 /* First see how many SIGTRAP events we have. */
2328 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2330 /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
2331 random_selector
= (int)
2332 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2334 if (debug_threads
&& num_events
> 1)
2335 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2336 num_events
, random_selector
);
2339 = (struct thread_info
*) find_inferior (&all_threads
,
2340 select_event_lwp_callback
,
2344 if (event_thread
!= NULL
)
2346 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2348 /* Switch the event LWP. */
2349 *orig_lp
= event_lp
;
2353 /* Decrement the suspend count of an LWP. */
2356 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2358 struct thread_info
*thread
= (struct thread_info
*) entry
;
2359 struct lwp_info
*lwp
= get_thread_lwp (thread
);
2361 /* Ignore EXCEPT. */
2367 gdb_assert (lwp
->suspended
>= 0);
2371 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2375 unsuspend_all_lwps (struct lwp_info
*except
)
2377 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
2380 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
2381 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
2383 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
2384 static ptid_t
linux_wait_1 (ptid_t ptid
,
2385 struct target_waitstatus
*ourstatus
,
2386 int target_options
);
2388 /* Stabilize threads (move out of jump pads).
2390 If a thread is midway collecting a fast tracepoint, we need to
2391 finish the collection and move it out of the jump pad before
2392 reporting the signal.
2394 This avoids recursion while collecting (when a signal arrives
2395 midway, and the signal handler itself collects), which would trash
2396 the trace buffer. In case the user set a breakpoint in a signal
2397 handler, this avoids the backtrace showing the jump pad, etc..
2398 Most importantly, there are certain things we can't do safely if
2399 threads are stopped in a jump pad (or in its callee's). For
2402 - starting a new trace run. A thread still collecting the
2403 previous run, could trash the trace buffer when resumed. The trace
2404 buffer control structures would have been reset but the thread had
2405 no way to tell. The thread could even midway memcpy'ing to the
2406 buffer, which would mean that when resumed, it would clobber the
2407 trace buffer that had been set for a new run.
2409 - we can't rewrite/reuse the jump pads for new tracepoints
2410 safely. Say you do tstart while a thread is stopped midway while
2411 collecting. When the thread is later resumed, it finishes the
2412 collection, and returns to the jump pad, to execute the original
2413 instruction that was under the tracepoint jump at the time the
2414 older run had been started. If the jump pad had been rewritten
2415 since for something else in the new run, the thread would now
2416 execute the wrong / random instructions. */
2419 linux_stabilize_threads (void)
2421 struct thread_info
*saved_thread
;
2422 struct thread_info
*thread_stuck
;
2425 = (struct thread_info
*) find_inferior (&all_threads
,
2426 stuck_in_jump_pad_callback
,
2428 if (thread_stuck
!= NULL
)
2431 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2432 lwpid_of (thread_stuck
));
2436 saved_thread
= current_thread
;
2438 stabilizing_threads
= 1;
2441 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
2443 /* Loop until all are stopped out of the jump pads. */
2444 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
2446 struct target_waitstatus ourstatus
;
2447 struct lwp_info
*lwp
;
2450 /* Note that we go through the full wait even loop. While
2451 moving threads out of jump pad, we need to be able to step
2452 over internal breakpoints and such. */
2453 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2455 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2457 lwp
= get_thread_lwp (current_thread
);
2462 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
2463 || current_thread
->last_resume_kind
== resume_stop
)
2465 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
2466 enqueue_one_deferred_signal (lwp
, &wstat
);
2471 find_inferior (&all_threads
, unsuspend_one_lwp
, NULL
);
2473 stabilizing_threads
= 0;
2475 current_thread
= saved_thread
;
2480 = (struct thread_info
*) find_inferior (&all_threads
,
2481 stuck_in_jump_pad_callback
,
2483 if (thread_stuck
!= NULL
)
2484 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
2485 lwpid_of (thread_stuck
));
2489 /* Wait for process, returns status. */
2492 linux_wait_1 (ptid_t ptid
,
2493 struct target_waitstatus
*ourstatus
, int target_options
)
2496 struct lwp_info
*event_child
;
2499 int step_over_finished
;
2500 int bp_explains_trap
;
2501 int maybe_internal_trap
;
2509 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
2512 /* Translate generic target options into linux options. */
2514 if (target_options
& TARGET_WNOHANG
)
2518 bp_explains_trap
= 0;
2521 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2523 if (ptid_equal (step_over_bkpt
, null_ptid
))
2524 pid
= linux_wait_for_event (ptid
, &w
, options
);
2528 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
2529 target_pid_to_str (step_over_bkpt
));
2530 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
2535 gdb_assert (target_options
& TARGET_WNOHANG
);
2539 debug_printf ("linux_wait_1 ret = null_ptid, "
2540 "TARGET_WAITKIND_IGNORE\n");
2544 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2551 debug_printf ("linux_wait_1 ret = null_ptid, "
2552 "TARGET_WAITKIND_NO_RESUMED\n");
2556 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
2560 event_child
= get_thread_lwp (current_thread
);
2562 /* linux_wait_for_event only returns an exit status for the last
2563 child of a process. Report it. */
2564 if (WIFEXITED (w
) || WIFSIGNALED (w
))
2568 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
2569 ourstatus
->value
.integer
= WEXITSTATUS (w
);
2573 debug_printf ("linux_wait_1 ret = %s, exited with "
2575 target_pid_to_str (ptid_of (current_thread
)),
2582 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
2583 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
2587 debug_printf ("linux_wait_1 ret = %s, terminated with "
2589 target_pid_to_str (ptid_of (current_thread
)),
2595 return ptid_of (current_thread
);
2598 /* If this event was not handled before, and is not a SIGTRAP, we
2599 report it. SIGILL and SIGSEGV are also treated as traps in case
2600 a breakpoint is inserted at the current PC. If this target does
2601 not support internal breakpoints at all, we also report the
2602 SIGTRAP without further processing; it's of no concern to us. */
2604 = (supports_breakpoints ()
2605 && (WSTOPSIG (w
) == SIGTRAP
2606 || ((WSTOPSIG (w
) == SIGILL
2607 || WSTOPSIG (w
) == SIGSEGV
)
2608 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
2610 if (maybe_internal_trap
)
2612 /* Handle anything that requires bookkeeping before deciding to
2613 report the event or continue waiting. */
2615 /* First check if we can explain the SIGTRAP with an internal
2616 breakpoint, or if we should possibly report the event to GDB.
2617 Do this before anything that may remove or insert a
2619 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
2621 /* We have a SIGTRAP, possibly a step-over dance has just
2622 finished. If so, tweak the state machine accordingly,
2623 reinsert breakpoints and delete any reinsert (software
2624 single-step) breakpoints. */
2625 step_over_finished
= finish_step_over (event_child
);
2627 /* Now invoke the callbacks of any internal breakpoints there. */
2628 check_breakpoints (event_child
->stop_pc
);
2630 /* Handle tracepoint data collecting. This may overflow the
2631 trace buffer, and cause a tracing stop, removing
2633 trace_event
= handle_tracepoints (event_child
);
2635 if (bp_explains_trap
)
2637 /* If we stepped or ran into an internal breakpoint, we've
2638 already handled it. So next time we resume (from this
2639 PC), we should step over it. */
2641 debug_printf ("Hit a gdbserver breakpoint.\n");
2643 if (breakpoint_here (event_child
->stop_pc
))
2644 event_child
->need_step_over
= 1;
2649 /* We have some other signal, possibly a step-over dance was in
2650 progress, and it should be cancelled too. */
2651 step_over_finished
= finish_step_over (event_child
);
2654 /* We have all the data we need. Either report the event to GDB, or
2655 resume threads and keep waiting for more. */
2657 /* If we're collecting a fast tracepoint, finish the collection and
2658 move out of the jump pad before delivering a signal. See
2659 linux_stabilize_threads. */
2662 && WSTOPSIG (w
) != SIGTRAP
2663 && supports_fast_tracepoints ()
2664 && agent_loaded_p ())
2667 debug_printf ("Got signal %d for LWP %ld. Check if we need "
2668 "to defer or adjust it.\n",
2669 WSTOPSIG (w
), lwpid_of (current_thread
));
2671 /* Allow debugging the jump pad itself. */
2672 if (current_thread
->last_resume_kind
!= resume_step
2673 && maybe_move_out_of_jump_pad (event_child
, &w
))
2675 enqueue_one_deferred_signal (event_child
, &w
);
2678 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
2679 WSTOPSIG (w
), lwpid_of (current_thread
));
2681 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
2686 if (event_child
->collecting_fast_tracepoint
)
2689 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
2690 "Check if we're already there.\n",
2691 lwpid_of (current_thread
),
2692 event_child
->collecting_fast_tracepoint
);
2696 event_child
->collecting_fast_tracepoint
2697 = linux_fast_tracepoint_collecting (event_child
, NULL
);
2699 if (event_child
->collecting_fast_tracepoint
!= 1)
2701 /* No longer need this breakpoint. */
2702 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
2705 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
2706 "stopping all threads momentarily.\n");
2708 /* Other running threads could hit this breakpoint.
2709 We don't handle moribund locations like GDB does,
2710 instead we always pause all threads when removing
2711 breakpoints, so that any step-over or
2712 decr_pc_after_break adjustment is always taken
2713 care of while the breakpoint is still
2715 stop_all_lwps (1, event_child
);
2716 cancel_breakpoints ();
2718 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
2719 event_child
->exit_jump_pad_bkpt
= NULL
;
2721 unstop_all_lwps (1, event_child
);
2723 gdb_assert (event_child
->suspended
>= 0);
2727 if (event_child
->collecting_fast_tracepoint
== 0)
2730 debug_printf ("fast tracepoint finished "
2731 "collecting successfully.\n");
2733 /* We may have a deferred signal to report. */
2734 if (dequeue_one_deferred_signal (event_child
, &w
))
2737 debug_printf ("dequeued one signal.\n");
2742 debug_printf ("no deferred signals.\n");
2744 if (stabilizing_threads
)
2746 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2747 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2751 debug_printf ("linux_wait_1 ret = %s, stopped "
2752 "while stabilizing threads\n",
2753 target_pid_to_str (ptid_of (current_thread
)));
2757 return ptid_of (current_thread
);
2763 /* Check whether GDB would be interested in this event. */
2765 /* If GDB is not interested in this signal, don't stop other
2766 threads, and don't report it to GDB. Just resume the inferior
2767 right away. We do this for threading-related signals as well as
2768 any that GDB specifically requested we ignore. But never ignore
2769 SIGSTOP if we sent it ourselves, and do not ignore signals when
2770 stepping - they may require special handling to skip the signal
2772 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
2775 && current_thread
->last_resume_kind
!= resume_step
2777 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
2778 (current_process ()->private->thread_db
!= NULL
2779 && (WSTOPSIG (w
) == __SIGRTMIN
2780 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
2783 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
2784 && !(WSTOPSIG (w
) == SIGSTOP
2785 && current_thread
->last_resume_kind
== resume_stop
))))
2787 siginfo_t info
, *info_p
;
2790 debug_printf ("Ignored signal %d for LWP %ld.\n",
2791 WSTOPSIG (w
), lwpid_of (current_thread
));
2793 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2794 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
2798 linux_resume_one_lwp (event_child
, event_child
->stepping
,
2799 WSTOPSIG (w
), info_p
);
2803 /* Note that all addresses are always "out of the step range" when
2804 there's no range to begin with. */
2805 in_step_range
= lwp_in_step_range (event_child
);
2807 /* If GDB wanted this thread to single step, and the thread is out
2808 of the step range, we always want to report the SIGTRAP, and let
2809 GDB handle it. Watchpoints should always be reported. So should
2810 signals we can't explain. A SIGTRAP we can't explain could be a
2811 GDB breakpoint --- we may or not support Z0 breakpoints. If we
2812 do, we're be able to handle GDB breakpoints on top of internal
2813 breakpoints, by handling the internal breakpoint and still
2814 reporting the event to GDB. If we don't, we're out of luck, GDB
2815 won't see the breakpoint hit. */
2816 report_to_gdb
= (!maybe_internal_trap
2817 || (current_thread
->last_resume_kind
== resume_step
2819 || event_child
->stopped_by_watchpoint
2820 || (!step_over_finished
&& !in_step_range
2821 && !bp_explains_trap
&& !trace_event
)
2822 || (gdb_breakpoint_here (event_child
->stop_pc
)
2823 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
2824 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
)));
2826 run_breakpoint_commands (event_child
->stop_pc
);
2828 /* We found no reason GDB would want us to stop. We either hit one
2829 of our own breakpoints, or finished an internal step GDB
2830 shouldn't know about. */
2835 if (bp_explains_trap
)
2836 debug_printf ("Hit a gdbserver breakpoint.\n");
2837 if (step_over_finished
)
2838 debug_printf ("Step-over finished.\n");
2840 debug_printf ("Tracepoint event.\n");
2841 if (lwp_in_step_range (event_child
))
2842 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
2843 paddress (event_child
->stop_pc
),
2844 paddress (event_child
->step_range_start
),
2845 paddress (event_child
->step_range_end
));
2848 /* We're not reporting this breakpoint to GDB, so apply the
2849 decr_pc_after_break adjustment to the inferior's regcache
2852 if (the_low_target
.set_pc
!= NULL
)
2854 struct regcache
*regcache
2855 = get_thread_regcache (current_thread
, 1);
2856 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
2859 /* We may have finished stepping over a breakpoint. If so,
2860 we've stopped and suspended all LWPs momentarily except the
2861 stepping one. This is where we resume them all again. We're
2862 going to keep waiting, so use proceed, which handles stepping
2863 over the next breakpoint. */
2865 debug_printf ("proceeding all threads.\n");
2867 if (step_over_finished
)
2868 unsuspend_all_lwps (event_child
);
2870 proceed_all_lwps ();
2876 if (current_thread
->last_resume_kind
== resume_step
)
2878 if (event_child
->step_range_start
== event_child
->step_range_end
)
2879 debug_printf ("GDB wanted to single-step, reporting event.\n");
2880 else if (!lwp_in_step_range (event_child
))
2881 debug_printf ("Out of step range, reporting event.\n");
2883 if (event_child
->stopped_by_watchpoint
)
2884 debug_printf ("Stopped by watchpoint.\n");
2885 if (gdb_breakpoint_here (event_child
->stop_pc
))
2886 debug_printf ("Stopped by GDB breakpoint.\n");
2888 debug_printf ("Hit a non-gdbserver trap event.\n");
2891 /* Alright, we're going to report a stop. */
2893 if (!non_stop
&& !stabilizing_threads
)
2895 /* In all-stop, stop all threads. */
2896 stop_all_lwps (0, NULL
);
2898 /* If we're not waiting for a specific LWP, choose an event LWP
2899 from among those that have had events. Giving equal priority
2900 to all LWPs that have had events helps prevent
2902 if (ptid_equal (ptid
, minus_one_ptid
))
2904 event_child
->status_pending_p
= 1;
2905 event_child
->status_pending
= w
;
2907 select_event_lwp (&event_child
);
2909 /* current_thread and event_child must stay in sync. */
2910 current_thread
= get_lwp_thread (event_child
);
2912 event_child
->status_pending_p
= 0;
2913 w
= event_child
->status_pending
;
2916 /* Now that we've selected our final event LWP, cancel any
2917 breakpoints in other LWPs that have hit a GDB breakpoint.
2918 See the comment in cancel_breakpoints_callback to find out
2920 find_inferior (&all_threads
, cancel_breakpoints_callback
, event_child
);
2922 /* If we were going a step-over, all other threads but the stepping one
2923 had been paused in start_step_over, with their suspend counts
2924 incremented. We don't want to do a full unstop/unpause, because we're
2925 in all-stop mode (so we want threads stopped), but we still need to
2926 unsuspend the other threads, to decrement their `suspended' count
2928 if (step_over_finished
)
2929 unsuspend_all_lwps (event_child
);
2931 /* Stabilize threads (move out of jump pads). */
2932 stabilize_threads ();
2936 /* If we just finished a step-over, then all threads had been
2937 momentarily paused. In all-stop, that's fine, we want
2938 threads stopped by now anyway. In non-stop, we need to
2939 re-resume threads that GDB wanted to be running. */
2940 if (step_over_finished
)
2941 unstop_all_lwps (1, event_child
);
2944 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2946 if (current_thread
->last_resume_kind
== resume_stop
2947 && WSTOPSIG (w
) == SIGSTOP
)
2949 /* A thread that has been requested to stop by GDB with vCont;t,
2950 and it stopped cleanly, so report as SIG0. The use of
2951 SIGSTOP is an implementation detail. */
2952 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2954 else if (current_thread
->last_resume_kind
== resume_stop
2955 && WSTOPSIG (w
) != SIGSTOP
)
2957 /* A thread that has been requested to stop by GDB with vCont;t,
2958 but, it stopped for other reasons. */
2959 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2963 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2966 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
2970 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
2971 target_pid_to_str (ptid_of (current_thread
)),
2972 ourstatus
->kind
, ourstatus
->value
.sig
);
2976 return ptid_of (current_thread
);
2979 /* Get rid of any pending event in the pipe. */
2981 async_file_flush (void)
2987 ret
= read (linux_event_pipe
[0], &buf
, 1);
2988 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
2991 /* Put something in the pipe, so the event loop wakes up. */
2993 async_file_mark (void)
2997 async_file_flush ();
3000 ret
= write (linux_event_pipe
[1], "+", 1);
3001 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3003 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3004 be awakened anyway. */
3008 linux_wait (ptid_t ptid
,
3009 struct target_waitstatus
*ourstatus
, int target_options
)
3013 /* Flush the async file first. */
3014 if (target_is_async_p ())
3015 async_file_flush ();
3017 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3019 /* If at least one stop was reported, there may be more. A single
3020 SIGCHLD can signal more than one child stop. */
3021 if (target_is_async_p ()
3022 && (target_options
& TARGET_WNOHANG
) != 0
3023 && !ptid_equal (event_ptid
, null_ptid
))
3029 /* Send a signal to an LWP. */
3032 kill_lwp (unsigned long lwpid
, int signo
)
3034 /* Use tkill, if possible, in case we are using nptl threads. If tkill
3035 fails, then we are not using nptl threads and we should be using kill. */
3039 static int tkill_failed
;
3046 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3047 if (errno
!= ENOSYS
)
3054 return kill (lwpid
, signo
);
3058 linux_stop_lwp (struct lwp_info
*lwp
)
3064 send_sigstop (struct lwp_info
*lwp
)
3068 pid
= lwpid_of (get_lwp_thread (lwp
));
3070 /* If we already have a pending stop signal for this process, don't
3072 if (lwp
->stop_expected
)
3075 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3081 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3083 lwp
->stop_expected
= 1;
3084 kill_lwp (pid
, SIGSTOP
);
3088 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
3090 struct thread_info
*thread
= (struct thread_info
*) entry
;
3091 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3093 /* Ignore EXCEPT. */
3104 /* Increment the suspend count of an LWP, and stop it, if not stopped
3107 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
3110 struct thread_info
*thread
= (struct thread_info
*) entry
;
3111 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3113 /* Ignore EXCEPT. */
3119 return send_sigstop_callback (entry
, except
);
3123 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3125 /* It's dead, really. */
3128 /* Store the exit status for later. */
3129 lwp
->status_pending_p
= 1;
3130 lwp
->status_pending
= wstat
;
3132 /* Prevent trying to stop it. */
3135 /* No further stops are expected from a dead lwp. */
3136 lwp
->stop_expected
= 0;
3139 /* Wait for all children to stop for the SIGSTOPs we just queued. */
3142 wait_for_sigstop (void)
3144 struct thread_info
*saved_thread
;
3149 saved_thread
= current_thread
;
3150 if (saved_thread
!= NULL
)
3151 saved_tid
= saved_thread
->entry
.id
;
3153 saved_tid
= null_ptid
; /* avoid bogus unused warning */
3156 debug_printf ("wait_for_sigstop: pulling events\n");
3158 /* Passing NULL_PTID as filter indicates we want all events to be
3159 left pending. Eventually this returns when there are no
3160 unwaited-for children left. */
3161 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
3163 gdb_assert (ret
== -1);
3165 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
3166 current_thread
= saved_thread
;
3170 debug_printf ("Previously current thread died.\n");
3174 /* We can't change the current inferior behind GDB's back,
3175 otherwise, a subsequent command may apply to the wrong
3177 current_thread
= NULL
;
3181 /* Set a valid thread as current. */
3182 set_desired_thread (0);
3187 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
3188 move it out, because we need to report the stop event to GDB. For
3189 example, if the user puts a breakpoint in the jump pad, it's
3190 because she wants to debug it. */
3193 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
3195 struct thread_info
*thread
= (struct thread_info
*) entry
;
3196 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3198 gdb_assert (lwp
->suspended
== 0);
3199 gdb_assert (lwp
->stopped
);
3201 /* Allow debugging the jump pad, gdb_collect, etc.. */
3202 return (supports_fast_tracepoints ()
3203 && agent_loaded_p ()
3204 && (gdb_breakpoint_here (lwp
->stop_pc
)
3205 || lwp
->stopped_by_watchpoint
3206 || thread
->last_resume_kind
== resume_step
)
3207 && linux_fast_tracepoint_collecting (lwp
, NULL
));
3211 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
3213 struct thread_info
*thread
= (struct thread_info
*) entry
;
3214 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3217 gdb_assert (lwp
->suspended
== 0);
3218 gdb_assert (lwp
->stopped
);
3220 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
3222 /* Allow debugging the jump pad, gdb_collect, etc. */
3223 if (!gdb_breakpoint_here (lwp
->stop_pc
)
3224 && !lwp
->stopped_by_watchpoint
3225 && thread
->last_resume_kind
!= resume_step
3226 && maybe_move_out_of_jump_pad (lwp
, wstat
))
3229 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
3234 lwp
->status_pending_p
= 0;
3235 enqueue_one_deferred_signal (lwp
, wstat
);
3238 debug_printf ("Signal %d for LWP %ld deferred "
3240 WSTOPSIG (*wstat
), lwpid_of (thread
));
3243 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
3250 lwp_running (struct inferior_list_entry
*entry
, void *data
)
3252 struct thread_info
*thread
= (struct thread_info
*) entry
;
3253 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3262 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
3263 If SUSPEND, then also increase the suspend count of every LWP,
3267 stop_all_lwps (int suspend
, struct lwp_info
*except
)
3269 /* Should not be called recursively. */
3270 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
3275 debug_printf ("stop_all_lwps (%s, except=%s)\n",
3276 suspend
? "stop-and-suspend" : "stop",
3278 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
3282 stopping_threads
= (suspend
3283 ? STOPPING_AND_SUSPENDING_THREADS
3284 : STOPPING_THREADS
);
3287 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
3289 find_inferior (&all_threads
, send_sigstop_callback
, except
);
3290 wait_for_sigstop ();
3291 stopping_threads
= NOT_STOPPING_THREADS
;
3295 debug_printf ("stop_all_lwps done, setting stopping_threads "
3296 "back to !stopping\n");
3301 /* Resume execution of the inferior process.
3302 If STEP is nonzero, single-step it.
3303 If SIGNAL is nonzero, give it that signal. */
3306 linux_resume_one_lwp (struct lwp_info
*lwp
,
3307 int step
, int signal
, siginfo_t
*info
)
3309 struct thread_info
*thread
= get_lwp_thread (lwp
);
3310 struct thread_info
*saved_thread
;
3311 int fast_tp_collecting
;
3313 if (lwp
->stopped
== 0)
3316 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
3318 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
3320 /* Cancel actions that rely on GDB not changing the PC (e.g., the
3321 user used the "jump" command, or "set $pc = foo"). */
3322 if (lwp
->stop_pc
!= get_pc (lwp
))
3324 /* Collecting 'while-stepping' actions doesn't make sense
3326 release_while_stepping_state_list (thread
);
3329 /* If we have pending signals or status, and a new signal, enqueue the
3330 signal. Also enqueue the signal if we are waiting to reinsert a
3331 breakpoint; it will be picked up again below. */
3333 && (lwp
->status_pending_p
3334 || lwp
->pending_signals
!= NULL
3335 || lwp
->bp_reinsert
!= 0
3336 || fast_tp_collecting
))
3338 struct pending_signals
*p_sig
;
3339 p_sig
= xmalloc (sizeof (*p_sig
));
3340 p_sig
->prev
= lwp
->pending_signals
;
3341 p_sig
->signal
= signal
;
3343 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3345 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3346 lwp
->pending_signals
= p_sig
;
3349 if (lwp
->status_pending_p
)
3352 debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);"
3353 " has pending status\n",
3354 lwpid_of (thread
), step
? "step" : "continue", signal
,
3355 lwp
->stop_expected
? "expected" : "not expected");
3359 saved_thread
= current_thread
;
3360 current_thread
= thread
;
3363 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
3364 lwpid_of (thread
), step
? "step" : "continue", signal
,
3365 lwp
->stop_expected
? "expected" : "not expected");
3367 /* This bit needs some thinking about. If we get a signal that
3368 we must report while a single-step reinsert is still pending,
3369 we often end up resuming the thread. It might be better to
3370 (ew) allow a stack of pending events; then we could be sure that
3371 the reinsert happened right away and not lose any signals.
3373 Making this stack would also shrink the window in which breakpoints are
3374 uninserted (see comment in linux_wait_for_lwp) but not enough for
3375 complete correctness, so it won't solve that problem. It may be
3376 worthwhile just to solve this one, however. */
3377 if (lwp
->bp_reinsert
!= 0)
3380 debug_printf (" pending reinsert at 0x%s\n",
3381 paddress (lwp
->bp_reinsert
));
3383 if (can_hardware_single_step ())
3385 if (fast_tp_collecting
== 0)
3388 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
3390 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
3397 /* Postpone any pending signal. It was enqueued above. */
3401 if (fast_tp_collecting
== 1)
3404 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3405 " (exit-jump-pad-bkpt)\n",
3408 /* Postpone any pending signal. It was enqueued above. */
3411 else if (fast_tp_collecting
== 2)
3414 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3415 " single-stepping\n",
3418 if (can_hardware_single_step ())
3422 internal_error (__FILE__
, __LINE__
,
3423 "moving out of jump pad single-stepping"
3424 " not implemented on this target");
3427 /* Postpone any pending signal. It was enqueued above. */
3431 /* If we have while-stepping actions in this thread set it stepping.
3432 If we have a signal to deliver, it may or may not be set to
3433 SIG_IGN, we don't know. Assume so, and allow collecting
3434 while-stepping into a signal handler. A possible smart thing to
3435 do would be to set an internal breakpoint at the signal return
3436 address, continue, and carry on catching this while-stepping
3437 action only when that breakpoint is hit. A future
3439 if (thread
->while_stepping
!= NULL
3440 && can_hardware_single_step ())
3443 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
3448 if (debug_threads
&& the_low_target
.get_pc
!= NULL
)
3450 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
3451 CORE_ADDR pc
= (*the_low_target
.get_pc
) (regcache
);
3452 debug_printf (" resuming from pc 0x%lx\n", (long) pc
);
3455 /* If we have pending signals, consume one unless we are trying to
3456 reinsert a breakpoint or we're trying to finish a fast tracepoint
3458 if (lwp
->pending_signals
!= NULL
3459 && lwp
->bp_reinsert
== 0
3460 && fast_tp_collecting
== 0)
3462 struct pending_signals
**p_sig
;
3464 p_sig
= &lwp
->pending_signals
;
3465 while ((*p_sig
)->prev
!= NULL
)
3466 p_sig
= &(*p_sig
)->prev
;
3468 signal
= (*p_sig
)->signal
;
3469 if ((*p_sig
)->info
.si_signo
!= 0)
3470 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3477 if (the_low_target
.prepare_to_resume
!= NULL
)
3478 the_low_target
.prepare_to_resume (lwp
);
3480 regcache_invalidate_thread (thread
);
3483 lwp
->stopped_by_watchpoint
= 0;
3484 lwp
->stepping
= step
;
3485 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (thread
),
3486 (PTRACE_TYPE_ARG3
) 0,
3487 /* Coerce to a uintptr_t first to avoid potential gcc warning
3488 of coercing an 8 byte integer to a 4 byte pointer. */
3489 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
3491 current_thread
= saved_thread
;
3494 /* ESRCH from ptrace either means that the thread was already
3495 running (an error) or that it is gone (a race condition). If
3496 it's gone, we will get a notification the next time we wait,
3497 so we can ignore the error. We could differentiate these
3498 two, but it's tricky without waiting; the thread still exists
3499 as a zombie, so sending it signal 0 would succeed. So just
3504 perror_with_name ("ptrace");
3508 struct thread_resume_array
3510 struct thread_resume
*resume
;
3514 /* This function is called once per thread via find_inferior.
3515 ARG is a pointer to a thread_resume_array struct.
3516 We look up the thread specified by ENTRY in ARG, and mark the thread
3517 with a pointer to the appropriate resume request.
3519 This algorithm is O(threads * resume elements), but resume elements
3520 is small (and will remain small at least until GDB supports thread
3524 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
3526 struct thread_info
*thread
= (struct thread_info
*) entry
;
3527 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3529 struct thread_resume_array
*r
;
3533 for (ndx
= 0; ndx
< r
->n
; ndx
++)
3535 ptid_t ptid
= r
->resume
[ndx
].thread
;
3536 if (ptid_equal (ptid
, minus_one_ptid
)
3537 || ptid_equal (ptid
, entry
->id
)
3538 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
3540 || (ptid_get_pid (ptid
) == pid_of (thread
)
3541 && (ptid_is_pid (ptid
)
3542 || ptid_get_lwp (ptid
) == -1)))
3544 if (r
->resume
[ndx
].kind
== resume_stop
3545 && thread
->last_resume_kind
== resume_stop
)
3548 debug_printf ("already %s LWP %ld at GDB's request\n",
3549 (thread
->last_status
.kind
3550 == TARGET_WAITKIND_STOPPED
)
3558 lwp
->resume
= &r
->resume
[ndx
];
3559 thread
->last_resume_kind
= lwp
->resume
->kind
;
3561 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
3562 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
3564 /* If we had a deferred signal to report, dequeue one now.
3565 This can happen if LWP gets more than one signal while
3566 trying to get out of a jump pad. */
3568 && !lwp
->status_pending_p
3569 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
3571 lwp
->status_pending_p
= 1;
3574 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
3575 "leaving status pending.\n",
3576 WSTOPSIG (lwp
->status_pending
),
3584 /* No resume action for this thread. */
3590 /* find_inferior callback for linux_resume.
3591 Set *FLAG_P if this lwp has an interesting status pending. */
3594 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
3596 struct thread_info
*thread
= (struct thread_info
*) entry
;
3597 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3599 /* LWPs which will not be resumed are not interesting, because
3600 we might not wait for them next time through linux_wait. */
3601 if (lwp
->resume
== NULL
)
3604 if (lwp
->status_pending_p
)
3605 * (int *) flag_p
= 1;
3610 /* Return 1 if this lwp that GDB wants running is stopped at an
3611 internal breakpoint that we need to step over. It assumes that any
3612 required STOP_PC adjustment has already been propagated to the
3613 inferior's regcache. */
3616 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
3618 struct thread_info
*thread
= (struct thread_info
*) entry
;
3619 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3620 struct thread_info
*saved_thread
;
3623 /* LWPs which will not be resumed are not interesting, because we
3624 might not wait for them next time through linux_wait. */
3629 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
3634 if (thread
->last_resume_kind
== resume_stop
)
3637 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
3643 gdb_assert (lwp
->suspended
>= 0);
3648 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
3653 if (!lwp
->need_step_over
)
3656 debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread
));
3659 if (lwp
->status_pending_p
)
3662 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
3668 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
3672 /* If the PC has changed since we stopped, then don't do anything,
3673 and let the breakpoint/tracepoint be hit. This happens if, for
3674 instance, GDB handled the decr_pc_after_break subtraction itself,
3675 GDB is OOL stepping this thread, or the user has issued a "jump"
3676 command, or poked thread's registers herself. */
3677 if (pc
!= lwp
->stop_pc
)
3680 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
3681 "Old stop_pc was 0x%s, PC is now 0x%s\n",
3683 paddress (lwp
->stop_pc
), paddress (pc
));
3685 lwp
->need_step_over
= 0;
3689 saved_thread
= current_thread
;
3690 current_thread
= thread
;
3692 /* We can only step over breakpoints we know about. */
3693 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
3695 /* Don't step over a breakpoint that GDB expects to hit
3696 though. If the condition is being evaluated on the target's side
3697 and it evaluate to false, step over this breakpoint as well. */
3698 if (gdb_breakpoint_here (pc
)
3699 && gdb_condition_true_at_breakpoint (pc
)
3700 && gdb_no_commands_at_breakpoint (pc
))
3703 debug_printf ("Need step over [LWP %ld]? yes, but found"
3704 " GDB breakpoint at 0x%s; skipping step over\n",
3705 lwpid_of (thread
), paddress (pc
));
3707 current_thread
= saved_thread
;
3713 debug_printf ("Need step over [LWP %ld]? yes, "
3714 "found breakpoint at 0x%s\n",
3715 lwpid_of (thread
), paddress (pc
));
3717 /* We've found an lwp that needs stepping over --- return 1 so
3718 that find_inferior stops looking. */
3719 current_thread
= saved_thread
;
3721 /* If the step over is cancelled, this is set again. */
3722 lwp
->need_step_over
= 0;
3727 current_thread
= saved_thread
;
3730 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
3732 lwpid_of (thread
), paddress (pc
));
3737 /* Start a step-over operation on LWP. When LWP stopped at a
3738 breakpoint, to make progress, we need to remove the breakpoint out
3739 of the way. If we let other threads run while we do that, they may
3740 pass by the breakpoint location and miss hitting it. To avoid
3741 that, a step-over momentarily stops all threads while LWP is
3742 single-stepped while the breakpoint is temporarily uninserted from
3743 the inferior. When the single-step finishes, we reinsert the
3744 breakpoint, and let all threads that are supposed to be running,
3747 On targets that don't support hardware single-step, we don't
3748 currently support full software single-stepping. Instead, we only
3749 support stepping over the thread event breakpoint, by asking the
3750 low target where to place a reinsert breakpoint. Since this
3751 routine assumes the breakpoint being stepped over is a thread event
3752 breakpoint, it usually assumes the return address of the current
3753 function is a good enough place to set the reinsert breakpoint. */
3756 start_step_over (struct lwp_info
*lwp
)
3758 struct thread_info
*thread
= get_lwp_thread (lwp
);
3759 struct thread_info
*saved_thread
;
3764 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
3767 stop_all_lwps (1, lwp
);
3768 gdb_assert (lwp
->suspended
== 0);
3771 debug_printf ("Done stopping all threads for step-over.\n");
3773 /* Note, we should always reach here with an already adjusted PC,
3774 either by GDB (if we're resuming due to GDB's request), or by our
3775 caller, if we just finished handling an internal breakpoint GDB
3776 shouldn't care about. */
3779 saved_thread
= current_thread
;
3780 current_thread
= thread
;
3782 lwp
->bp_reinsert
= pc
;
3783 uninsert_breakpoints_at (pc
);
3784 uninsert_fast_tracepoint_jumps_at (pc
);
3786 if (can_hardware_single_step ())
3792 CORE_ADDR raddr
= (*the_low_target
.breakpoint_reinsert_addr
) ();
3793 set_reinsert_breakpoint (raddr
);
3797 current_thread
= saved_thread
;
3799 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
3801 /* Require next event from this LWP. */
3802 step_over_bkpt
= thread
->entry
.id
;
3806 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
3807 start_step_over, if still there, and delete any reinsert
3808 breakpoints we've set, on non hardware single-step targets. */
3811 finish_step_over (struct lwp_info
*lwp
)
3813 if (lwp
->bp_reinsert
!= 0)
3816 debug_printf ("Finished step over.\n");
3818 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
3819 may be no breakpoint to reinsert there by now. */
3820 reinsert_breakpoints_at (lwp
->bp_reinsert
);
3821 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
3823 lwp
->bp_reinsert
= 0;
3825 /* Delete any software-single-step reinsert breakpoints. No
3826 longer needed. We don't have to worry about other threads
3827 hitting this trap, and later not being able to explain it,
3828 because we were stepping over a breakpoint, and we hold all
3829 threads but LWP stopped while doing that. */
3830 if (!can_hardware_single_step ())
3831 delete_reinsert_breakpoints ();
3833 step_over_bkpt
= null_ptid
;
3840 /* This function is called once per thread. We check the thread's resume
3841 request, which will tell us whether to resume, step, or leave the thread
3842 stopped; and what signal, if any, it should be sent.
3844 For threads which we aren't explicitly told otherwise, we preserve
3845 the stepping flag; this is used for stepping over gdbserver-placed
3848 If pending_flags was set in any thread, we queue any needed
3849 signals, since we won't actually resume. We already have a pending
3850 event to report, so we don't need to preserve any step requests;
3851 they should be re-issued if necessary. */
3854 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
3856 struct thread_info
*thread
= (struct thread_info
*) entry
;
3857 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3859 int leave_all_stopped
= * (int *) arg
;
3862 if (lwp
->resume
== NULL
)
3865 if (lwp
->resume
->kind
== resume_stop
)
3868 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
3873 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
3875 /* Stop the thread, and wait for the event asynchronously,
3876 through the event loop. */
3882 debug_printf ("already stopped LWP %ld\n",
3885 /* The LWP may have been stopped in an internal event that
3886 was not meant to be notified back to GDB (e.g., gdbserver
3887 breakpoint), so we should be reporting a stop event in
3890 /* If the thread already has a pending SIGSTOP, this is a
3891 no-op. Otherwise, something later will presumably resume
3892 the thread and this will cause it to cancel any pending
3893 operation, due to last_resume_kind == resume_stop. If
3894 the thread already has a pending status to report, we
3895 will still report it the next time we wait - see
3896 status_pending_p_callback. */
3898 /* If we already have a pending signal to report, then
3899 there's no need to queue a SIGSTOP, as this means we're
3900 midway through moving the LWP out of the jumppad, and we
3901 will report the pending signal as soon as that is
3903 if (lwp
->pending_signals_to_report
== NULL
)
3907 /* For stop requests, we're done. */
3909 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3913 /* If this thread which is about to be resumed has a pending status,
3914 then don't resume any threads - we can just report the pending
3915 status. Make sure to queue any signals that would otherwise be
3916 sent. In all-stop mode, we do this decision based on if *any*
3917 thread has a pending status. If there's a thread that needs the
3918 step-over-breakpoint dance, then don't resume any other thread
3919 but that particular one. */
3920 leave_pending
= (lwp
->status_pending_p
|| leave_all_stopped
);
3925 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
3927 step
= (lwp
->resume
->kind
== resume_step
);
3928 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
3933 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
3935 /* If we have a new signal, enqueue the signal. */
3936 if (lwp
->resume
->sig
!= 0)
3938 struct pending_signals
*p_sig
;
3939 p_sig
= xmalloc (sizeof (*p_sig
));
3940 p_sig
->prev
= lwp
->pending_signals
;
3941 p_sig
->signal
= lwp
->resume
->sig
;
3942 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3944 /* If this is the same signal we were previously stopped by,
3945 make sure to queue its siginfo. We can ignore the return
3946 value of ptrace; if it fails, we'll skip
3947 PTRACE_SETSIGINFO. */
3948 if (WIFSTOPPED (lwp
->last_status
)
3949 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
3950 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3953 lwp
->pending_signals
= p_sig
;
3957 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3963 linux_resume (struct thread_resume
*resume_info
, size_t n
)
3965 struct thread_resume_array array
= { resume_info
, n
};
3966 struct thread_info
*need_step_over
= NULL
;
3968 int leave_all_stopped
;
3973 debug_printf ("linux_resume:\n");
3976 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
3978 /* If there is a thread which would otherwise be resumed, which has
3979 a pending status, then don't resume any threads - we can just
3980 report the pending status. Make sure to queue any signals that
3981 would otherwise be sent. In non-stop mode, we'll apply this
3982 logic to each thread individually. We consume all pending events
3983 before considering to start a step-over (in all-stop). */
3986 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
3988 /* If there is a thread which would otherwise be resumed, which is
3989 stopped at a breakpoint that needs stepping over, then don't
3990 resume any threads - have it step over the breakpoint with all
3991 other threads stopped, then resume all threads again. Make sure
3992 to queue any signals that would otherwise be delivered or
3994 if (!any_pending
&& supports_breakpoints ())
3996 = (struct thread_info
*) find_inferior (&all_threads
,
3997 need_step_over_p
, NULL
);
3999 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
4003 if (need_step_over
!= NULL
)
4004 debug_printf ("Not resuming all, need step over\n");
4005 else if (any_pending
)
4006 debug_printf ("Not resuming, all-stop and found "
4007 "an LWP with pending status\n");
4009 debug_printf ("Resuming, no pending status or step over needed\n");
4012 /* Even if we're leaving threads stopped, queue all signals we'd
4013 otherwise deliver. */
4014 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
4017 start_step_over (get_thread_lwp (need_step_over
));
4021 debug_printf ("linux_resume done\n");
4026 /* This function is called once per thread. We check the thread's
4027 last resume request, which will tell us whether to resume, step, or
4028 leave the thread stopped. Any signal the client requested to be
4029 delivered has already been enqueued at this point.
4031 If any thread that GDB wants running is stopped at an internal
4032 breakpoint that needs stepping over, we start a step-over operation
4033 on that particular thread, and leave all others stopped. */
4036 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4038 struct thread_info
*thread
= (struct thread_info
*) entry
;
4039 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4046 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
4051 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
4055 if (thread
->last_resume_kind
== resume_stop
4056 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
4059 debug_printf (" client wants LWP to remain %ld stopped\n",
4064 if (lwp
->status_pending_p
)
4067 debug_printf (" LWP %ld has pending status, leaving stopped\n",
4072 gdb_assert (lwp
->suspended
>= 0);
4077 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
4081 if (thread
->last_resume_kind
== resume_stop
4082 && lwp
->pending_signals_to_report
== NULL
4083 && lwp
->collecting_fast_tracepoint
== 0)
4085 /* We haven't reported this LWP as stopped yet (otherwise, the
4086 last_status.kind check above would catch it, and we wouldn't
4087 reach here. This LWP may have been momentarily paused by a
4088 stop_all_lwps call while handling for example, another LWP's
4089 step-over. In that case, the pending expected SIGSTOP signal
4090 that was queued at vCont;t handling time will have already
4091 been consumed by wait_for_sigstop, and so we need to requeue
4092 another one here. Note that if the LWP already has a SIGSTOP
4093 pending, this is a no-op. */
4096 debug_printf ("Client wants LWP %ld to stop. "
4097 "Making sure it has a SIGSTOP pending\n",
4103 step
= thread
->last_resume_kind
== resume_step
;
4104 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4109 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4111 struct thread_info
*thread
= (struct thread_info
*) entry
;
4112 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4118 gdb_assert (lwp
->suspended
>= 0);
4120 return proceed_one_lwp (entry
, except
);
4123 /* When we finish a step-over, set threads running again. If there's
4124 another thread that may need a step-over, now's the time to start
4125 it. Eventually, we'll move all threads past their breakpoints. */
4128 proceed_all_lwps (void)
4130 struct thread_info
*need_step_over
;
4132 /* If there is a thread which would otherwise be resumed, which is
4133 stopped at a breakpoint that needs stepping over, then don't
4134 resume any threads - have it step over the breakpoint with all
4135 other threads stopped, then resume all threads again. */
4137 if (supports_breakpoints ())
4140 = (struct thread_info
*) find_inferior (&all_threads
,
4141 need_step_over_p
, NULL
);
4143 if (need_step_over
!= NULL
)
4146 debug_printf ("proceed_all_lwps: found "
4147 "thread %ld needing a step-over\n",
4148 lwpid_of (need_step_over
));
4150 start_step_over (get_thread_lwp (need_step_over
));
4156 debug_printf ("Proceeding, no step-over needed\n");
4158 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
4161 /* Stopped LWPs that the client wanted to be running, that don't have
4162 pending statuses, are set to run again, except for EXCEPT, if not
4163 NULL. This undoes a stop_all_lwps call. */
4166 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
4172 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
4173 lwpid_of (get_lwp_thread (except
)));
4175 debug_printf ("unstopping all lwps\n");
4179 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
4181 find_inferior (&all_threads
, proceed_one_lwp
, except
);
4185 debug_printf ("unstop_all_lwps done\n");
4191 #ifdef HAVE_LINUX_REGSETS
4193 #define use_linux_regsets 1
4195 /* Returns true if REGSET has been disabled. */
4198 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
4200 return (info
->disabled_regsets
!= NULL
4201 && info
->disabled_regsets
[regset
- info
->regsets
]);
4204 /* Disable REGSET. */
4207 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
4211 dr_offset
= regset
- info
->regsets
;
4212 if (info
->disabled_regsets
== NULL
)
4213 info
->disabled_regsets
= xcalloc (1, info
->num_regsets
);
4214 info
->disabled_regsets
[dr_offset
] = 1;
4218 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
4219 struct regcache
*regcache
)
4221 struct regset_info
*regset
;
4222 int saw_general_regs
= 0;
4226 pid
= lwpid_of (current_thread
);
4227 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4232 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4235 buf
= xmalloc (regset
->size
);
4237 nt_type
= regset
->nt_type
;
4241 iov
.iov_len
= regset
->size
;
4242 data
= (void *) &iov
;
4248 res
= ptrace (regset
->get_request
, pid
,
4249 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4251 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4257 /* If we get EIO on a regset, do not try it again for
4258 this process mode. */
4259 disable_regset (regsets_info
, regset
);
4261 else if (errno
== ENODATA
)
4263 /* ENODATA may be returned if the regset is currently
4264 not "active". This can happen in normal operation,
4265 so suppress the warning in this case. */
4270 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
4277 if (regset
->type
== GENERAL_REGS
)
4278 saw_general_regs
= 1;
4279 regset
->store_function (regcache
, buf
);
4283 if (saw_general_regs
)
4290 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
4291 struct regcache
*regcache
)
4293 struct regset_info
*regset
;
4294 int saw_general_regs
= 0;
4298 pid
= lwpid_of (current_thread
);
4299 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4304 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
4305 || regset
->fill_function
== NULL
)
4308 buf
= xmalloc (regset
->size
);
4310 /* First fill the buffer with the current register set contents,
4311 in case there are any items in the kernel's regset that are
4312 not in gdbserver's regcache. */
4314 nt_type
= regset
->nt_type
;
4318 iov
.iov_len
= regset
->size
;
4319 data
= (void *) &iov
;
4325 res
= ptrace (regset
->get_request
, pid
,
4326 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4328 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4333 /* Then overlay our cached registers on that. */
4334 regset
->fill_function (regcache
, buf
);
4336 /* Only now do we write the register set. */
4338 res
= ptrace (regset
->set_request
, pid
,
4339 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4341 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
4349 /* If we get EIO on a regset, do not try it again for
4350 this process mode. */
4351 disable_regset (regsets_info
, regset
);
4353 else if (errno
== ESRCH
)
4355 /* At this point, ESRCH should mean the process is
4356 already gone, in which case we simply ignore attempts
4357 to change its registers. See also the related
4358 comment in linux_resume_one_lwp. */
4364 perror ("Warning: ptrace(regsets_store_inferior_registers)");
4367 else if (regset
->type
== GENERAL_REGS
)
4368 saw_general_regs
= 1;
4371 if (saw_general_regs
)
4377 #else /* !HAVE_LINUX_REGSETS */
4379 #define use_linux_regsets 0
4380 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
4381 #define regsets_store_inferior_registers(regsets_info, regcache) 1
4385 /* Return 1 if register REGNO is supported by one of the regset ptrace
4386 calls or 0 if it has to be transferred individually. */
4389 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
4391 unsigned char mask
= 1 << (regno
% 8);
4392 size_t index
= regno
/ 8;
4394 return (use_linux_regsets
4395 && (regs_info
->regset_bitmap
== NULL
4396 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
4399 #ifdef HAVE_LINUX_USRREGS
4402 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
4406 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
4407 error ("Invalid register number %d.", regnum
);
4409 addr
= usrregs
->regmap
[regnum
];
4414 /* Fetch one register. */
4416 fetch_register (const struct usrregs_info
*usrregs
,
4417 struct regcache
*regcache
, int regno
)
4424 if (regno
>= usrregs
->num_regs
)
4426 if ((*the_low_target
.cannot_fetch_register
) (regno
))
4429 regaddr
= register_addr (usrregs
, regno
);
4433 size
= ((register_size (regcache
->tdesc
, regno
)
4434 + sizeof (PTRACE_XFER_TYPE
) - 1)
4435 & -sizeof (PTRACE_XFER_TYPE
));
4436 buf
= alloca (size
);
4438 pid
= lwpid_of (current_thread
);
4439 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4442 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
4443 ptrace (PTRACE_PEEKUSER
, pid
,
4444 /* Coerce to a uintptr_t first to avoid potential gcc warning
4445 of coercing an 8 byte integer to a 4 byte pointer. */
4446 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
4447 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4449 error ("reading register %d: %s", regno
, strerror (errno
));
4452 if (the_low_target
.supply_ptrace_register
)
4453 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
4455 supply_register (regcache
, regno
, buf
);
4458 /* Store one register. */
4460 store_register (const struct usrregs_info
*usrregs
,
4461 struct regcache
*regcache
, int regno
)
4468 if (regno
>= usrregs
->num_regs
)
4470 if ((*the_low_target
.cannot_store_register
) (regno
))
4473 regaddr
= register_addr (usrregs
, regno
);
4477 size
= ((register_size (regcache
->tdesc
, regno
)
4478 + sizeof (PTRACE_XFER_TYPE
) - 1)
4479 & -sizeof (PTRACE_XFER_TYPE
));
4480 buf
= alloca (size
);
4481 memset (buf
, 0, size
);
4483 if (the_low_target
.collect_ptrace_register
)
4484 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
4486 collect_register (regcache
, regno
, buf
);
4488 pid
= lwpid_of (current_thread
);
4489 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4492 ptrace (PTRACE_POKEUSER
, pid
,
4493 /* Coerce to a uintptr_t first to avoid potential gcc warning
4494 about coercing an 8 byte integer to a 4 byte pointer. */
4495 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
4496 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
4499 /* At this point, ESRCH should mean the process is
4500 already gone, in which case we simply ignore attempts
4501 to change its registers. See also the related
4502 comment in linux_resume_one_lwp. */
4506 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
4507 error ("writing register %d: %s", regno
, strerror (errno
));
4509 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4513 /* Fetch all registers, or just one, from the child process.
4514 If REGNO is -1, do this for all registers, skipping any that are
4515 assumed to have been retrieved by regsets_fetch_inferior_registers,
4516 unless ALL is non-zero.
4517 Otherwise, REGNO specifies which register (so we can save time). */
4519 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
4520 struct regcache
*regcache
, int regno
, int all
)
4522 struct usrregs_info
*usr
= regs_info
->usrregs
;
4526 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4527 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4528 fetch_register (usr
, regcache
, regno
);
4531 fetch_register (usr
, regcache
, regno
);
4534 /* Store our register values back into the inferior.
4535 If REGNO is -1, do this for all registers, skipping any that are
4536 assumed to have been saved by regsets_store_inferior_registers,
4537 unless ALL is non-zero.
4538 Otherwise, REGNO specifies which register (so we can save time). */
4540 usr_store_inferior_registers (const struct regs_info
*regs_info
,
4541 struct regcache
*regcache
, int regno
, int all
)
4543 struct usrregs_info
*usr
= regs_info
->usrregs
;
4547 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4548 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4549 store_register (usr
, regcache
, regno
);
4552 store_register (usr
, regcache
, regno
);
4555 #else /* !HAVE_LINUX_USRREGS */
4557 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4558 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4564 linux_fetch_registers (struct regcache
*regcache
, int regno
)
4568 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4572 if (the_low_target
.fetch_register
!= NULL
4573 && regs_info
->usrregs
!= NULL
)
4574 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
4575 (*the_low_target
.fetch_register
) (regcache
, regno
);
4577 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
4578 if (regs_info
->usrregs
!= NULL
)
4579 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
4583 if (the_low_target
.fetch_register
!= NULL
4584 && (*the_low_target
.fetch_register
) (regcache
, regno
))
4587 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4589 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
4591 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4592 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
4597 linux_store_registers (struct regcache
*regcache
, int regno
)
4601 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4605 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4607 if (regs_info
->usrregs
!= NULL
)
4608 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
4612 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4614 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4616 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4617 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
4622 /* Copy LEN bytes from inferior's memory starting at MEMADDR
4623 to debugger memory starting at MYADDR. */
4626 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
4628 int pid
= lwpid_of (current_thread
);
4629 register PTRACE_XFER_TYPE
*buffer
;
4630 register CORE_ADDR addr
;
4637 /* Try using /proc. Don't bother for one word. */
4638 if (len
>= 3 * sizeof (long))
4642 /* We could keep this file open and cache it - possibly one per
4643 thread. That requires some juggling, but is even faster. */
4644 sprintf (filename
, "/proc/%d/mem", pid
);
4645 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4649 /* If pread64 is available, use it. It's faster if the kernel
4650 supports it (only one syscall), and it's 64-bit safe even on
4651 32-bit platforms (for instance, SPARC debugging a SPARC64
4654 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
4657 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
4658 bytes
= read (fd
, myaddr
, len
);
4665 /* Some data was read, we'll try to get the rest with ptrace. */
4675 /* Round starting address down to longword boundary. */
4676 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4677 /* Round ending address up; get number of longwords that makes. */
4678 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4679 / sizeof (PTRACE_XFER_TYPE
));
4680 /* Allocate buffer of that many longwords. */
4681 buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4683 /* Read all the longwords */
4685 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4687 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4688 about coercing an 8 byte integer to a 4 byte pointer. */
4689 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
4690 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4691 (PTRACE_TYPE_ARG4
) 0);
4697 /* Copy appropriate bytes out of the buffer. */
4700 i
*= sizeof (PTRACE_XFER_TYPE
);
4701 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
4703 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4710 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
4711 memory at MEMADDR. On failure (cannot write to the inferior)
4712 returns the value of errno. Always succeeds if LEN is zero. */
4715 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
4718 /* Round starting address down to longword boundary. */
4719 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4720 /* Round ending address up; get number of longwords that makes. */
4722 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4723 / sizeof (PTRACE_XFER_TYPE
);
4725 /* Allocate buffer of that many longwords. */
4726 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*)
4727 alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4729 int pid
= lwpid_of (current_thread
);
4733 /* Zero length write always succeeds. */
4739 /* Dump up to four bytes. */
4740 unsigned int val
= * (unsigned int *) myaddr
;
4746 val
= val
& 0xffffff;
4747 debug_printf ("Writing %0*x to 0x%08lx\n", 2 * ((len
< 4) ? len
: 4),
4748 val
, (long)memaddr
);
4751 /* Fill start and end extra bytes of buffer with existing memory data. */
4754 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4755 about coercing an 8 byte integer to a 4 byte pointer. */
4756 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
4757 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4758 (PTRACE_TYPE_ARG4
) 0);
4766 = ptrace (PTRACE_PEEKTEXT
, pid
,
4767 /* Coerce to a uintptr_t first to avoid potential gcc warning
4768 about coercing an 8 byte integer to a 4 byte pointer. */
4769 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
4770 * sizeof (PTRACE_XFER_TYPE
)),
4771 (PTRACE_TYPE_ARG4
) 0);
4776 /* Copy data to be written over corresponding part of buffer. */
4778 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4781 /* Write the entire buffer. */
4783 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4786 ptrace (PTRACE_POKETEXT
, pid
,
4787 /* Coerce to a uintptr_t first to avoid potential gcc warning
4788 about coercing an 8 byte integer to a 4 byte pointer. */
4789 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4790 (PTRACE_TYPE_ARG4
) buffer
[i
]);
4799 linux_look_up_symbols (void)
4801 #ifdef USE_THREAD_DB
4802 struct process_info
*proc
= current_process ();
4804 if (proc
->private->thread_db
!= NULL
)
4807 /* If the kernel supports tracing clones, then we don't need to
4808 use the magic thread event breakpoint to learn about
4810 thread_db_init (!linux_supports_traceclone ());
4815 linux_request_interrupt (void)
4817 extern unsigned long signal_pid
;
4819 /* Send a SIGINT to the process group. This acts just like the user
4820 typed a ^C on the controlling terminal. */
4821 kill (-signal_pid
, SIGINT
);
4824 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
4825 to debugger memory starting at MYADDR. */
4828 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
4830 char filename
[PATH_MAX
];
4832 int pid
= lwpid_of (current_thread
);
4834 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
4836 fd
= open (filename
, O_RDONLY
);
4840 if (offset
!= (CORE_ADDR
) 0
4841 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4844 n
= read (fd
, myaddr
, len
);
4851 /* These breakpoint and watchpoint related wrapper functions simply
4852 pass on the function call if the target has registered a
4853 corresponding function. */
4856 linux_supports_z_point_type (char z_type
)
4858 return (the_low_target
.supports_z_point_type
!= NULL
4859 && the_low_target
.supports_z_point_type (z_type
));
4863 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
4864 int size
, struct raw_breakpoint
*bp
)
4866 if (the_low_target
.insert_point
!= NULL
)
4867 return the_low_target
.insert_point (type
, addr
, size
, bp
);
4869 /* Unsupported (see target.h). */
4874 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
4875 int size
, struct raw_breakpoint
*bp
)
4877 if (the_low_target
.remove_point
!= NULL
)
4878 return the_low_target
.remove_point (type
, addr
, size
, bp
);
4880 /* Unsupported (see target.h). */
4885 linux_stopped_by_watchpoint (void)
4887 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
4889 return lwp
->stopped_by_watchpoint
;
4893 linux_stopped_data_address (void)
4895 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
4897 return lwp
->stopped_data_address
;
4900 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
4901 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
4902 && defined(PT_TEXT_END_ADDR)
4904 /* This is only used for targets that define PT_TEXT_ADDR,
4905 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
4906 the target has different ways of acquiring this information, like
4909 /* Under uClinux, programs are loaded at non-zero offsets, which we need
4910 to tell gdb about. */
4913 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
4915 unsigned long text
, text_end
, data
;
4916 int pid
= lwpid_of (get_thread_lwp (current_thread
));
4920 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
4921 (PTRACE_TYPE_ARG4
) 0);
4922 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
4923 (PTRACE_TYPE_ARG4
) 0);
4924 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
4925 (PTRACE_TYPE_ARG4
) 0);
4929 /* Both text and data offsets produced at compile-time (and so
4930 used by gdb) are relative to the beginning of the program,
4931 with the data segment immediately following the text segment.
4932 However, the actual runtime layout in memory may put the data
4933 somewhere else, so when we send gdb a data base-address, we
4934 use the real data base address and subtract the compile-time
4935 data base-address from it (which is just the length of the
4936 text segment). BSS immediately follows data in both
4939 *data_p
= data
- (text_end
- text
);
4948 linux_qxfer_osdata (const char *annex
,
4949 unsigned char *readbuf
, unsigned const char *writebuf
,
4950 CORE_ADDR offset
, int len
)
4952 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
4955 /* Convert a native/host siginfo object, into/from the siginfo in the
4956 layout of the inferiors' architecture. */
4959 siginfo_fixup (siginfo_t
*siginfo
, void *inf_siginfo
, int direction
)
4963 if (the_low_target
.siginfo_fixup
!= NULL
)
4964 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
4966 /* If there was no callback, or the callback didn't do anything,
4967 then just do a straight memcpy. */
4971 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
4973 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
4978 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
4979 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
4983 char inf_siginfo
[sizeof (siginfo_t
)];
4985 if (current_thread
== NULL
)
4988 pid
= lwpid_of (current_thread
);
4991 debug_printf ("%s siginfo for lwp %d.\n",
4992 readbuf
!= NULL
? "Reading" : "Writing",
4995 if (offset
>= sizeof (siginfo
))
4998 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5001 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
5002 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
5003 inferior with a 64-bit GDBSERVER should look the same as debugging it
5004 with a 32-bit GDBSERVER, we need to convert it. */
5005 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
5007 if (offset
+ len
> sizeof (siginfo
))
5008 len
= sizeof (siginfo
) - offset
;
5010 if (readbuf
!= NULL
)
5011 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
5014 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
5016 /* Convert back to ptrace layout before flushing it out. */
5017 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
5019 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5026 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5027 so we notice when children change state; as the handler for the
5028 sigsuspend in my_waitpid. */
5031 sigchld_handler (int signo
)
5033 int old_errno
= errno
;
5039 /* fprintf is not async-signal-safe, so call write
5041 if (write (2, "sigchld_handler\n",
5042 sizeof ("sigchld_handler\n") - 1) < 0)
5043 break; /* just ignore */
5047 if (target_is_async_p ())
5048 async_file_mark (); /* trigger a linux_wait */
5054 linux_supports_non_stop (void)
5060 linux_async (int enable
)
5062 int previous
= target_is_async_p ();
5065 debug_printf ("linux_async (%d), previous=%d\n",
5068 if (previous
!= enable
)
5071 sigemptyset (&mask
);
5072 sigaddset (&mask
, SIGCHLD
);
5074 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
5078 if (pipe (linux_event_pipe
) == -1)
5080 linux_event_pipe
[0] = -1;
5081 linux_event_pipe
[1] = -1;
5082 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5084 warning ("creating event pipe failed.");
5088 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5089 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5091 /* Register the event loop handler. */
5092 add_file_handler (linux_event_pipe
[0],
5093 handle_target_event
, NULL
);
5095 /* Always trigger a linux_wait. */
5100 delete_file_handler (linux_event_pipe
[0]);
5102 close (linux_event_pipe
[0]);
5103 close (linux_event_pipe
[1]);
5104 linux_event_pipe
[0] = -1;
5105 linux_event_pipe
[1] = -1;
5108 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5115 linux_start_non_stop (int nonstop
)
5117 /* Register or unregister from event-loop accordingly. */
5118 linux_async (nonstop
);
5120 if (target_is_async_p () != (nonstop
!= 0))
5127 linux_supports_multi_process (void)
5133 linux_supports_disable_randomization (void)
5135 #ifdef HAVE_PERSONALITY
5143 linux_supports_agent (void)
5149 linux_supports_range_stepping (void)
5151 if (*the_low_target
.supports_range_stepping
== NULL
)
5154 return (*the_low_target
.supports_range_stepping
) ();
5157 /* Enumerate spufs IDs for process PID. */
5159 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
5165 struct dirent
*entry
;
5167 sprintf (path
, "/proc/%ld/fd", pid
);
5168 dir
= opendir (path
);
5173 while ((entry
= readdir (dir
)) != NULL
)
5179 fd
= atoi (entry
->d_name
);
5183 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
5184 if (stat (path
, &st
) != 0)
5186 if (!S_ISDIR (st
.st_mode
))
5189 if (statfs (path
, &stfs
) != 0)
5191 if (stfs
.f_type
!= SPUFS_MAGIC
)
5194 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
5196 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
5206 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
5207 object type, using the /proc file system. */
5209 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
5210 unsigned const char *writebuf
,
5211 CORE_ADDR offset
, int len
)
5213 long pid
= lwpid_of (current_thread
);
5218 if (!writebuf
&& !readbuf
)
5226 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
5229 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
5230 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
5235 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5242 ret
= write (fd
, writebuf
, (size_t) len
);
5244 ret
= read (fd
, readbuf
, (size_t) len
);
5250 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
5251 struct target_loadseg
5253 /* Core address to which the segment is mapped. */
5255 /* VMA recorded in the program header. */
5257 /* Size of this segment in memory. */
5261 # if defined PT_GETDSBT
5262 struct target_loadmap
5264 /* Protocol version number, must be zero. */
5266 /* Pointer to the DSBT table, its size, and the DSBT index. */
5267 unsigned *dsbt_table
;
5268 unsigned dsbt_size
, dsbt_index
;
5269 /* Number of segments in this map. */
5271 /* The actual memory map. */
5272 struct target_loadseg segs
[/*nsegs*/];
5274 # define LINUX_LOADMAP PT_GETDSBT
5275 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
5276 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
5278 struct target_loadmap
5280 /* Protocol version number, must be zero. */
5282 /* Number of segments in this map. */
5284 /* The actual memory map. */
5285 struct target_loadseg segs
[/*nsegs*/];
5287 # define LINUX_LOADMAP PTRACE_GETFDPIC
5288 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
5289 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
5293 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
5294 unsigned char *myaddr
, unsigned int len
)
5296 int pid
= lwpid_of (current_thread
);
5298 struct target_loadmap
*data
= NULL
;
5299 unsigned int actual_length
, copy_length
;
5301 if (strcmp (annex
, "exec") == 0)
5302 addr
= (int) LINUX_LOADMAP_EXEC
;
5303 else if (strcmp (annex
, "interp") == 0)
5304 addr
= (int) LINUX_LOADMAP_INTERP
;
5308 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
5314 actual_length
= sizeof (struct target_loadmap
)
5315 + sizeof (struct target_loadseg
) * data
->nsegs
;
5317 if (offset
< 0 || offset
> actual_length
)
5320 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
5321 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
5325 # define linux_read_loadmap NULL
5326 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
5329 linux_process_qsupported (const char *query
)
5331 if (the_low_target
.process_qsupported
!= NULL
)
5332 the_low_target
.process_qsupported (query
);
5336 linux_supports_tracepoints (void)
5338 if (*the_low_target
.supports_tracepoints
== NULL
)
5341 return (*the_low_target
.supports_tracepoints
) ();
5345 linux_read_pc (struct regcache
*regcache
)
5347 if (the_low_target
.get_pc
== NULL
)
5350 return (*the_low_target
.get_pc
) (regcache
);
5354 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
5356 gdb_assert (the_low_target
.set_pc
!= NULL
);
5358 (*the_low_target
.set_pc
) (regcache
, pc
);
5362 linux_thread_stopped (struct thread_info
*thread
)
5364 return get_thread_lwp (thread
)->stopped
;
5367 /* This exposes stop-all-threads functionality to other modules. */
5370 linux_pause_all (int freeze
)
5372 stop_all_lwps (freeze
, NULL
);
5375 /* This exposes unstop-all-threads functionality to other gdbserver
5379 linux_unpause_all (int unfreeze
)
5381 unstop_all_lwps (unfreeze
, NULL
);
5385 linux_prepare_to_access_memory (void)
5387 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5390 linux_pause_all (1);
5395 linux_done_accessing_memory (void)
5397 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5400 linux_unpause_all (1);
5404 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
5405 CORE_ADDR collector
,
5408 CORE_ADDR
*jump_entry
,
5409 CORE_ADDR
*trampoline
,
5410 ULONGEST
*trampoline_size
,
5411 unsigned char *jjump_pad_insn
,
5412 ULONGEST
*jjump_pad_insn_size
,
5413 CORE_ADDR
*adjusted_insn_addr
,
5414 CORE_ADDR
*adjusted_insn_addr_end
,
5417 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
5418 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
5419 jump_entry
, trampoline
, trampoline_size
,
5420 jjump_pad_insn
, jjump_pad_insn_size
,
5421 adjusted_insn_addr
, adjusted_insn_addr_end
,
5425 static struct emit_ops
*
5426 linux_emit_ops (void)
5428 if (the_low_target
.emit_ops
!= NULL
)
5429 return (*the_low_target
.emit_ops
) ();
5435 linux_get_min_fast_tracepoint_insn_len (void)
5437 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
5440 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
5443 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
5444 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
5446 char filename
[PATH_MAX
];
5448 const int auxv_size
= is_elf64
5449 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
5450 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
5452 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5454 fd
= open (filename
, O_RDONLY
);
5460 while (read (fd
, buf
, auxv_size
) == auxv_size
5461 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
5465 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
5467 switch (aux
->a_type
)
5470 *phdr_memaddr
= aux
->a_un
.a_val
;
5473 *num_phdr
= aux
->a_un
.a_val
;
5479 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
5481 switch (aux
->a_type
)
5484 *phdr_memaddr
= aux
->a_un
.a_val
;
5487 *num_phdr
= aux
->a_un
.a_val
;
5495 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
5497 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
5498 "phdr_memaddr = %ld, phdr_num = %d",
5499 (long) *phdr_memaddr
, *num_phdr
);
5506 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
5509 get_dynamic (const int pid
, const int is_elf64
)
5511 CORE_ADDR phdr_memaddr
, relocation
;
5513 unsigned char *phdr_buf
;
5514 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
5516 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
5519 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
5520 phdr_buf
= alloca (num_phdr
* phdr_size
);
5522 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
5525 /* Compute relocation: it is expected to be 0 for "regular" executables,
5526 non-zero for PIE ones. */
5528 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
5531 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5533 if (p
->p_type
== PT_PHDR
)
5534 relocation
= phdr_memaddr
- p
->p_vaddr
;
5538 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5540 if (p
->p_type
== PT_PHDR
)
5541 relocation
= phdr_memaddr
- p
->p_vaddr
;
5544 if (relocation
== -1)
5546 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
5547 any real world executables, including PIE executables, have always
5548 PT_PHDR present. PT_PHDR is not present in some shared libraries or
5549 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
5550 or present DT_DEBUG anyway (fpc binaries are statically linked).
5552 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
5554 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
5559 for (i
= 0; i
< num_phdr
; i
++)
5563 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5565 if (p
->p_type
== PT_DYNAMIC
)
5566 return p
->p_vaddr
+ relocation
;
5570 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5572 if (p
->p_type
== PT_DYNAMIC
)
5573 return p
->p_vaddr
+ relocation
;
5580 /* Return &_r_debug in the inferior, or -1 if not present. Return value
5581 can be 0 if the inferior does not yet have the library list initialized.
5582 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
5583 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
5586 get_r_debug (const int pid
, const int is_elf64
)
5588 CORE_ADDR dynamic_memaddr
;
5589 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
5590 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
5593 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
5594 if (dynamic_memaddr
== 0)
5597 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
5601 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
5602 #ifdef DT_MIPS_RLD_MAP
5606 unsigned char buf
[sizeof (Elf64_Xword
)];
5610 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5612 if (linux_read_memory (dyn
->d_un
.d_val
,
5613 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5618 #endif /* DT_MIPS_RLD_MAP */
5620 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5621 map
= dyn
->d_un
.d_val
;
5623 if (dyn
->d_tag
== DT_NULL
)
5628 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
5629 #ifdef DT_MIPS_RLD_MAP
5633 unsigned char buf
[sizeof (Elf32_Word
)];
5637 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5639 if (linux_read_memory (dyn
->d_un
.d_val
,
5640 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5645 #endif /* DT_MIPS_RLD_MAP */
5647 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5648 map
= dyn
->d_un
.d_val
;
5650 if (dyn
->d_tag
== DT_NULL
)
5654 dynamic_memaddr
+= dyn_size
;
5660 /* Read one pointer from MEMADDR in the inferior. */
5663 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
5667 /* Go through a union so this works on either big or little endian
5668 hosts, when the inferior's pointer size is smaller than the size
5669 of CORE_ADDR. It is assumed the inferior's endianness is the
5670 same of the superior's. */
5673 CORE_ADDR core_addr
;
5678 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
5681 if (ptr_size
== sizeof (CORE_ADDR
))
5682 *ptr
= addr
.core_addr
;
5683 else if (ptr_size
== sizeof (unsigned int))
5686 gdb_assert_not_reached ("unhandled pointer size");
5691 struct link_map_offsets
5693 /* Offset and size of r_debug.r_version. */
5694 int r_version_offset
;
5696 /* Offset and size of r_debug.r_map. */
5699 /* Offset to l_addr field in struct link_map. */
5702 /* Offset to l_name field in struct link_map. */
5705 /* Offset to l_ld field in struct link_map. */
5708 /* Offset to l_next field in struct link_map. */
5711 /* Offset to l_prev field in struct link_map. */
5715 /* Construct qXfer:libraries-svr4:read reply. */
5718 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
5719 unsigned const char *writebuf
,
5720 CORE_ADDR offset
, int len
)
5723 unsigned document_len
;
5724 struct process_info_private
*const priv
= current_process ()->private;
5725 char filename
[PATH_MAX
];
5728 static const struct link_map_offsets lmo_32bit_offsets
=
5730 0, /* r_version offset. */
5731 4, /* r_debug.r_map offset. */
5732 0, /* l_addr offset in link_map. */
5733 4, /* l_name offset in link_map. */
5734 8, /* l_ld offset in link_map. */
5735 12, /* l_next offset in link_map. */
5736 16 /* l_prev offset in link_map. */
5739 static const struct link_map_offsets lmo_64bit_offsets
=
5741 0, /* r_version offset. */
5742 8, /* r_debug.r_map offset. */
5743 0, /* l_addr offset in link_map. */
5744 8, /* l_name offset in link_map. */
5745 16, /* l_ld offset in link_map. */
5746 24, /* l_next offset in link_map. */
5747 32 /* l_prev offset in link_map. */
5749 const struct link_map_offsets
*lmo
;
5750 unsigned int machine
;
5752 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
5753 int allocated
= 1024;
5755 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
5756 int header_done
= 0;
5758 if (writebuf
!= NULL
)
5760 if (readbuf
== NULL
)
5763 pid
= lwpid_of (current_thread
);
5764 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
5765 is_elf64
= elf_64_file_p (filename
, &machine
);
5766 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
5767 ptr_size
= is_elf64
? 8 : 4;
5769 while (annex
[0] != '\0')
5775 sep
= strchr (annex
, '=');
5780 if (len
== 5 && strncmp (annex
, "start", 5) == 0)
5782 else if (len
== 4 && strncmp (annex
, "prev", 4) == 0)
5786 annex
= strchr (sep
, ';');
5793 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
5800 if (priv
->r_debug
== 0)
5801 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
5803 /* We failed to find DT_DEBUG. Such situation will not change
5804 for this inferior - do not retry it. Report it to GDB as
5805 E01, see for the reasons at the GDB solib-svr4.c side. */
5806 if (priv
->r_debug
== (CORE_ADDR
) -1)
5809 if (priv
->r_debug
!= 0)
5811 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
5812 (unsigned char *) &r_version
,
5813 sizeof (r_version
)) != 0
5816 warning ("unexpected r_debug version %d", r_version
);
5818 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
5819 &lm_addr
, ptr_size
) != 0)
5821 warning ("unable to read r_map from 0x%lx",
5822 (long) priv
->r_debug
+ lmo
->r_map_offset
);
5827 document
= xmalloc (allocated
);
5828 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
5829 p
= document
+ strlen (document
);
5832 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
5833 &l_name
, ptr_size
) == 0
5834 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
5835 &l_addr
, ptr_size
) == 0
5836 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
5837 &l_ld
, ptr_size
) == 0
5838 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
5839 &l_prev
, ptr_size
) == 0
5840 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
5841 &l_next
, ptr_size
) == 0)
5843 unsigned char libname
[PATH_MAX
];
5845 if (lm_prev
!= l_prev
)
5847 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
5848 (long) lm_prev
, (long) l_prev
);
5852 /* Ignore the first entry even if it has valid name as the first entry
5853 corresponds to the main executable. The first entry should not be
5854 skipped if the dynamic loader was loaded late by a static executable
5855 (see solib-svr4.c parameter ignore_first). But in such case the main
5856 executable does not have PT_DYNAMIC present and this function already
5857 exited above due to failed get_r_debug. */
5860 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
5865 /* Not checking for error because reading may stop before
5866 we've got PATH_MAX worth of characters. */
5868 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
5869 libname
[sizeof (libname
) - 1] = '\0';
5870 if (libname
[0] != '\0')
5872 /* 6x the size for xml_escape_text below. */
5873 size_t len
= 6 * strlen ((char *) libname
);
5878 /* Terminate `<library-list-svr4'. */
5883 while (allocated
< p
- document
+ len
+ 200)
5885 /* Expand to guarantee sufficient storage. */
5886 uintptr_t document_len
= p
- document
;
5888 document
= xrealloc (document
, 2 * allocated
);
5890 p
= document
+ document_len
;
5893 name
= xml_escape_text ((char *) libname
);
5894 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
5895 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
5896 name
, (unsigned long) lm_addr
,
5897 (unsigned long) l_addr
, (unsigned long) l_ld
);
5908 /* Empty list; terminate `<library-list-svr4'. */
5912 strcpy (p
, "</library-list-svr4>");
5914 document_len
= strlen (document
);
5915 if (offset
< document_len
)
5916 document_len
-= offset
;
5919 if (len
> document_len
)
5922 memcpy (readbuf
, document
+ offset
, len
);
5928 #ifdef HAVE_LINUX_BTRACE
5930 /* See to_enable_btrace target method. */
5932 static struct btrace_target_info
*
5933 linux_low_enable_btrace (ptid_t ptid
)
5935 struct btrace_target_info
*tinfo
;
5937 tinfo
= linux_enable_btrace (ptid
);
5941 struct thread_info
*thread
= find_thread_ptid (ptid
);
5942 struct regcache
*regcache
= get_thread_regcache (thread
, 0);
5944 tinfo
->ptr_bits
= register_size (regcache
->tdesc
, 0) * 8;
5950 /* See to_disable_btrace target method. */
5953 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
5955 enum btrace_error err
;
5957 err
= linux_disable_btrace (tinfo
);
5958 return (err
== BTRACE_ERR_NONE
? 0 : -1);
5961 /* See to_read_btrace target method. */
5964 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
5967 VEC (btrace_block_s
) *btrace
;
5968 struct btrace_block
*block
;
5969 enum btrace_error err
;
5973 err
= linux_read_btrace (&btrace
, tinfo
, type
);
5974 if (err
!= BTRACE_ERR_NONE
)
5976 if (err
== BTRACE_ERR_OVERFLOW
)
5977 buffer_grow_str0 (buffer
, "E.Overflow.");
5979 buffer_grow_str0 (buffer
, "E.Generic Error.");
5984 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
5985 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
5987 for (i
= 0; VEC_iterate (btrace_block_s
, btrace
, i
, block
); i
++)
5988 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
5989 paddress (block
->begin
), paddress (block
->end
));
5991 buffer_grow_str0 (buffer
, "</btrace>\n");
5993 VEC_free (btrace_block_s
, btrace
);
5997 #endif /* HAVE_LINUX_BTRACE */
5999 static struct target_ops linux_target_ops
= {
6000 linux_create_inferior
,
6009 linux_fetch_registers
,
6010 linux_store_registers
,
6011 linux_prepare_to_access_memory
,
6012 linux_done_accessing_memory
,
6015 linux_look_up_symbols
,
6016 linux_request_interrupt
,
6018 linux_supports_z_point_type
,
6021 linux_stopped_by_watchpoint
,
6022 linux_stopped_data_address
,
6023 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6024 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6025 && defined(PT_TEXT_END_ADDR)
6030 #ifdef USE_THREAD_DB
6031 thread_db_get_tls_address
,
6036 hostio_last_error_from_errno
,
6039 linux_supports_non_stop
,
6041 linux_start_non_stop
,
6042 linux_supports_multi_process
,
6043 #ifdef USE_THREAD_DB
6044 thread_db_handle_monitor_command
,
6048 linux_common_core_of_thread
,
6050 linux_process_qsupported
,
6051 linux_supports_tracepoints
,
6054 linux_thread_stopped
,
6058 linux_cancel_breakpoints
,
6059 linux_stabilize_threads
,
6060 linux_install_fast_tracepoint_jump_pad
,
6062 linux_supports_disable_randomization
,
6063 linux_get_min_fast_tracepoint_insn_len
,
6064 linux_qxfer_libraries_svr4
,
6065 linux_supports_agent
,
6066 #ifdef HAVE_LINUX_BTRACE
6067 linux_supports_btrace
,
6068 linux_low_enable_btrace
,
6069 linux_low_disable_btrace
,
6070 linux_low_read_btrace
,
6077 linux_supports_range_stepping
,
6081 linux_init_signals ()
6083 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
6084 to find what the cancel signal actually is. */
6085 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
6086 signal (__SIGRTMIN
+1, SIG_IGN
);
6090 #ifdef HAVE_LINUX_REGSETS
6092 initialize_regsets_info (struct regsets_info
*info
)
6094 for (info
->num_regsets
= 0;
6095 info
->regsets
[info
->num_regsets
].size
>= 0;
6096 info
->num_regsets
++)
6102 initialize_low (void)
6104 struct sigaction sigchld_action
;
6105 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
6106 set_target_ops (&linux_target_ops
);
6107 set_breakpoint_data (the_low_target
.breakpoint
,
6108 the_low_target
.breakpoint_len
);
6109 linux_init_signals ();
6110 linux_ptrace_init_warnings ();
6112 sigchld_action
.sa_handler
= sigchld_handler
;
6113 sigemptyset (&sigchld_action
.sa_mask
);
6114 sigchld_action
.sa_flags
= SA_RESTART
;
6115 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
6117 initialize_low_arch ();