1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-1996, 1998-2012 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 "linux-osdata.h"
25 #include <sys/param.h>
26 #include <sys/ptrace.h>
27 #include "linux-ptrace.h"
28 #include "linux-procfs.h"
30 #include <sys/ioctl.h>
36 #include <sys/syscall.h>
40 #include <sys/types.h>
46 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
47 then ELFMAG0 will have been defined. If it didn't get included by
48 gdb_proc_service.h then including it will likely introduce a duplicate
49 definition of elf_fpregset_t. */
54 #define SPUFS_MAGIC 0x23c9b64e
57 #ifdef HAVE_PERSONALITY
58 # include <sys/personality.h>
59 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
60 # define ADDR_NO_RANDOMIZE 0x0040000
69 #define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
72 /* This is the kernel's hard limit. Not to be confused with
79 #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__))
84 /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol
85 representation of the thread ID.
87 ``all_lwps'' is keyed by the process ID - which on Linux is (presently)
88 the same as the LWP ID.
90 ``all_processes'' is keyed by the "overall process ID", which
91 GNU/Linux calls tgid, "thread group ID". */
93 struct inferior_list all_lwps
;
95 /* A list of all unknown processes which receive stop signals. Some other
96 process will presumably claim each of these as forked children
99 struct inferior_list stopped_pids
;
101 /* FIXME this is a bit of a hack, and could be removed. */
102 int stopping_threads
;
104 /* FIXME make into a target method? */
105 int using_threads
= 1;
107 /* True if we're presently stabilizing threads (moving them out of
109 static int stabilizing_threads
;
111 /* This flag is true iff we've just created or attached to our first
112 inferior but it has not stopped yet. As soon as it does, we need
113 to call the low target's arch_setup callback. Doing this only on
114 the first inferior avoids reinializing the architecture on every
115 inferior, and avoids messing with the register caches of the
116 already running inferiors. NOTE: this assumes all inferiors under
117 control of gdbserver have the same architecture. */
118 static int new_inferior
;
120 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
121 int step
, int signal
, siginfo_t
*info
);
122 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
123 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
124 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
125 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
126 static void *add_lwp (ptid_t ptid
);
127 static int linux_stopped_by_watchpoint (void);
128 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
129 static void proceed_all_lwps (void);
130 static int finish_step_over (struct lwp_info
*lwp
);
131 static CORE_ADDR
get_stop_pc (struct lwp_info
*lwp
);
132 static int kill_lwp (unsigned long lwpid
, int signo
);
133 static void linux_enable_event_reporting (int pid
);
135 /* True if the low target can hardware single-step. Such targets
136 don't need a BREAKPOINT_REINSERT_ADDR callback. */
139 can_hardware_single_step (void)
141 return (the_low_target
.breakpoint_reinsert_addr
== NULL
);
144 /* True if the low target supports memory breakpoints. If so, we'll
145 have a GET_PC implementation. */
148 supports_breakpoints (void)
150 return (the_low_target
.get_pc
!= NULL
);
153 /* Returns true if this target can support fast tracepoints. This
154 does not mean that the in-process agent has been loaded in the
158 supports_fast_tracepoints (void)
160 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
163 struct pending_signals
167 struct pending_signals
*prev
;
170 #define PTRACE_ARG3_TYPE void *
171 #define PTRACE_ARG4_TYPE void *
172 #define PTRACE_XFER_TYPE long
174 #ifdef HAVE_LINUX_REGSETS
175 static char *disabled_regsets
;
176 static int num_regsets
;
179 /* The read/write ends of the pipe registered as waitable file in the
181 static int linux_event_pipe
[2] = { -1, -1 };
183 /* True if we're currently in async mode. */
184 #define target_is_async_p() (linux_event_pipe[0] != -1)
186 static void send_sigstop (struct lwp_info
*lwp
);
187 static void wait_for_sigstop (struct inferior_list_entry
*entry
);
189 /* Accepts an integer PID; Returns a string representing a file that
190 can be opened to get info for the child process.
191 Space for the result is malloc'd, caller must free. */
194 linux_child_pid_to_exec_file (int pid
)
198 name1
= xmalloc (MAXPATHLEN
);
199 name2
= xmalloc (MAXPATHLEN
);
200 memset (name2
, 0, MAXPATHLEN
);
202 sprintf (name1
, "/proc/%d/exe", pid
);
203 if (readlink (name1
, name2
, MAXPATHLEN
) > 0)
215 /* Return non-zero if HEADER is a 64-bit ELF file. */
218 elf_64_header_p (const Elf64_Ehdr
*header
)
220 return (header
->e_ident
[EI_MAG0
] == ELFMAG0
221 && header
->e_ident
[EI_MAG1
] == ELFMAG1
222 && header
->e_ident
[EI_MAG2
] == ELFMAG2
223 && header
->e_ident
[EI_MAG3
] == ELFMAG3
224 && header
->e_ident
[EI_CLASS
] == ELFCLASS64
);
227 /* Return non-zero if FILE is a 64-bit ELF file,
228 zero if the file is not a 64-bit ELF file,
229 and -1 if the file is not accessible or doesn't exist. */
232 elf_64_file_p (const char *file
)
237 fd
= open (file
, O_RDONLY
);
241 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
248 return elf_64_header_p (&header
);
252 delete_lwp (struct lwp_info
*lwp
)
254 remove_thread (get_lwp_thread (lwp
));
255 remove_inferior (&all_lwps
, &lwp
->head
);
256 free (lwp
->arch_private
);
260 /* Add a process to the common process list, and set its private
263 static struct process_info
*
264 linux_add_process (int pid
, int attached
)
266 struct process_info
*proc
;
268 /* Is this the first process? If so, then set the arch. */
269 if (all_processes
.head
== NULL
)
272 proc
= add_process (pid
, attached
);
273 proc
->private = xcalloc (1, sizeof (*proc
->private));
275 if (the_low_target
.new_process
!= NULL
)
276 proc
->private->arch_private
= the_low_target
.new_process ();
281 /* Wrapper function for waitpid which handles EINTR, and emulates
282 __WALL for systems where that is not available. */
285 my_waitpid (int pid
, int *status
, int flags
)
290 fprintf (stderr
, "my_waitpid (%d, 0x%x)\n", pid
, flags
);
294 sigset_t block_mask
, org_mask
, wake_mask
;
297 wnohang
= (flags
& WNOHANG
) != 0;
298 flags
&= ~(__WALL
| __WCLONE
);
301 /* Block all signals while here. This avoids knowing about
302 LinuxThread's signals. */
303 sigfillset (&block_mask
);
304 sigprocmask (SIG_BLOCK
, &block_mask
, &org_mask
);
306 /* ... except during the sigsuspend below. */
307 sigemptyset (&wake_mask
);
311 /* Since all signals are blocked, there's no need to check
313 ret
= waitpid (pid
, status
, flags
);
316 if (ret
== -1 && out_errno
!= ECHILD
)
321 if (flags
& __WCLONE
)
323 /* We've tried both flavors now. If WNOHANG is set,
324 there's nothing else to do, just bail out. */
329 fprintf (stderr
, "blocking\n");
331 /* Block waiting for signals. */
332 sigsuspend (&wake_mask
);
338 sigprocmask (SIG_SETMASK
, &org_mask
, NULL
);
343 ret
= waitpid (pid
, status
, flags
);
344 while (ret
== -1 && errno
== EINTR
);
349 fprintf (stderr
, "my_waitpid (%d, 0x%x): status(%x), %d\n",
350 pid
, flags
, status
? *status
: -1, ret
);
356 /* Handle a GNU/Linux extended wait response. If we see a clone
357 event, we need to add the new LWP to our list (and not report the
358 trap to higher layers). */
361 handle_extended_wait (struct lwp_info
*event_child
, int wstat
)
363 int event
= wstat
>> 16;
364 struct lwp_info
*new_lwp
;
366 if (event
== PTRACE_EVENT_CLONE
)
369 unsigned long new_pid
;
370 int ret
, status
= W_STOPCODE (SIGSTOP
);
372 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_child
), 0, &new_pid
);
374 /* If we haven't already seen the new PID stop, wait for it now. */
375 if (! pull_pid_from_list (&stopped_pids
, new_pid
))
377 /* The new child has a pending SIGSTOP. We can't affect it until it
378 hits the SIGSTOP, but we're already attached. */
380 ret
= my_waitpid (new_pid
, &status
, __WALL
);
383 perror_with_name ("waiting for new child");
384 else if (ret
!= new_pid
)
385 warning ("wait returned unexpected PID %d", ret
);
386 else if (!WIFSTOPPED (status
))
387 warning ("wait returned unexpected status 0x%x", status
);
390 linux_enable_event_reporting (new_pid
);
392 ptid
= ptid_build (pid_of (event_child
), new_pid
, 0);
393 new_lwp
= (struct lwp_info
*) add_lwp (ptid
);
394 add_thread (ptid
, new_lwp
);
396 /* Either we're going to immediately resume the new thread
397 or leave it stopped. linux_resume_one_lwp is a nop if it
398 thinks the thread is currently running, so set this first
399 before calling linux_resume_one_lwp. */
400 new_lwp
->stopped
= 1;
402 /* Normally we will get the pending SIGSTOP. But in some cases
403 we might get another signal delivered to the group first.
404 If we do get another signal, be sure not to lose it. */
405 if (WSTOPSIG (status
) == SIGSTOP
)
407 if (stopping_threads
)
408 new_lwp
->stop_pc
= get_stop_pc (new_lwp
);
410 linux_resume_one_lwp (new_lwp
, 0, 0, NULL
);
414 new_lwp
->stop_expected
= 1;
416 if (stopping_threads
)
418 new_lwp
->stop_pc
= get_stop_pc (new_lwp
);
419 new_lwp
->status_pending_p
= 1;
420 new_lwp
->status_pending
= status
;
423 /* Pass the signal on. This is what GDB does - except
424 shouldn't we really report it instead? */
425 linux_resume_one_lwp (new_lwp
, 0, WSTOPSIG (status
), NULL
);
428 /* Always resume the current thread. If we are stopping
429 threads, it will have a pending SIGSTOP; we may as well
431 linux_resume_one_lwp (event_child
, event_child
->stepping
, 0, NULL
);
435 /* Return the PC as read from the regcache of LWP, without any
439 get_pc (struct lwp_info
*lwp
)
441 struct thread_info
*saved_inferior
;
442 struct regcache
*regcache
;
445 if (the_low_target
.get_pc
== NULL
)
448 saved_inferior
= current_inferior
;
449 current_inferior
= get_lwp_thread (lwp
);
451 regcache
= get_thread_regcache (current_inferior
, 1);
452 pc
= (*the_low_target
.get_pc
) (regcache
);
455 fprintf (stderr
, "pc is 0x%lx\n", (long) pc
);
457 current_inferior
= saved_inferior
;
461 /* This function should only be called if LWP got a SIGTRAP.
462 The SIGTRAP could mean several things.
464 On i386, where decr_pc_after_break is non-zero:
465 If we were single-stepping this process using PTRACE_SINGLESTEP,
466 we will get only the one SIGTRAP (even if the instruction we
467 stepped over was a breakpoint). The value of $eip will be the
469 If we continue the process using PTRACE_CONT, we will get a
470 SIGTRAP when we hit a breakpoint. The value of $eip will be
471 the instruction after the breakpoint (i.e. needs to be
472 decremented). If we report the SIGTRAP to GDB, we must also
473 report the undecremented PC. If we cancel the SIGTRAP, we
474 must resume at the decremented PC.
476 (Presumably, not yet tested) On a non-decr_pc_after_break machine
477 with hardware or kernel single-step:
478 If we single-step over a breakpoint instruction, our PC will
479 point at the following instruction. If we continue and hit a
480 breakpoint instruction, our PC will point at the breakpoint
484 get_stop_pc (struct lwp_info
*lwp
)
488 if (the_low_target
.get_pc
== NULL
)
491 stop_pc
= get_pc (lwp
);
493 if (WSTOPSIG (lwp
->last_status
) == SIGTRAP
495 && !lwp
->stopped_by_watchpoint
496 && lwp
->last_status
>> 16 == 0)
497 stop_pc
-= the_low_target
.decr_pc_after_break
;
500 fprintf (stderr
, "stop pc is 0x%lx\n", (long) stop_pc
);
506 add_lwp (ptid_t ptid
)
508 struct lwp_info
*lwp
;
510 lwp
= (struct lwp_info
*) xmalloc (sizeof (*lwp
));
511 memset (lwp
, 0, sizeof (*lwp
));
515 if (the_low_target
.new_thread
!= NULL
)
516 lwp
->arch_private
= the_low_target
.new_thread ();
518 add_inferior_to_list (&all_lwps
, &lwp
->head
);
523 /* Start an inferior process and returns its pid.
524 ALLARGS is a vector of program-name and args. */
527 linux_create_inferior (char *program
, char **allargs
)
529 #ifdef HAVE_PERSONALITY
530 int personality_orig
= 0, personality_set
= 0;
532 struct lwp_info
*new_lwp
;
536 #ifdef HAVE_PERSONALITY
537 if (disable_randomization
)
540 personality_orig
= personality (0xffffffff);
541 if (errno
== 0 && !(personality_orig
& ADDR_NO_RANDOMIZE
))
544 personality (personality_orig
| ADDR_NO_RANDOMIZE
);
546 if (errno
!= 0 || (personality_set
547 && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE
)))
548 warning ("Error disabling address space randomization: %s",
553 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
559 perror_with_name ("fork");
563 ptrace (PTRACE_TRACEME
, 0, 0, 0);
565 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
566 signal (__SIGRTMIN
+ 1, SIG_DFL
);
571 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
572 stdout to stderr so that inferior i/o doesn't corrupt the connection.
573 Also, redirect stdin to /dev/null. */
574 if (remote_connection_is_stdio ())
577 open ("/dev/null", O_RDONLY
);
579 if (write (2, "stdin/stdout redirected\n",
580 sizeof ("stdin/stdout redirected\n") - 1) < 0)
581 /* Errors ignored. */;
584 execv (program
, allargs
);
586 execvp (program
, allargs
);
588 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
594 #ifdef HAVE_PERSONALITY
598 personality (personality_orig
);
600 warning ("Error restoring address space randomization: %s",
605 linux_add_process (pid
, 0);
607 ptid
= ptid_build (pid
, pid
, 0);
608 new_lwp
= add_lwp (ptid
);
609 add_thread (ptid
, new_lwp
);
610 new_lwp
->must_set_ptrace_flags
= 1;
615 /* Attach to an inferior process. */
618 linux_attach_lwp_1 (unsigned long lwpid
, int initial
)
621 struct lwp_info
*new_lwp
;
623 if (ptrace (PTRACE_ATTACH
, lwpid
, 0, 0) != 0)
627 /* If we fail to attach to an LWP, just warn. */
628 fprintf (stderr
, "Cannot attach to lwp %ld: %s (%d)\n", lwpid
,
629 strerror (errno
), errno
);
634 /* If we fail to attach to a process, report an error. */
635 error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid
,
636 strerror (errno
), errno
);
640 /* If lwp is the tgid, we handle adding existing threads later.
641 Otherwise we just add lwp without bothering about any other
643 ptid
= ptid_build (lwpid
, lwpid
, 0);
646 /* Note that extracting the pid from the current inferior is
647 safe, since we're always called in the context of the same
648 process as this new thread. */
649 int pid
= pid_of (get_thread_lwp (current_inferior
));
650 ptid
= ptid_build (pid
, lwpid
, 0);
653 new_lwp
= (struct lwp_info
*) add_lwp (ptid
);
654 add_thread (ptid
, new_lwp
);
656 /* We need to wait for SIGSTOP before being able to make the next
657 ptrace call on this LWP. */
658 new_lwp
->must_set_ptrace_flags
= 1;
660 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
663 There are several cases to consider here:
665 1) gdbserver has already attached to the process and is being notified
666 of a new thread that is being created.
667 In this case we should ignore that SIGSTOP and resume the
668 process. This is handled below by setting stop_expected = 1,
669 and the fact that add_thread sets last_resume_kind ==
672 2) This is the first thread (the process thread), and we're attaching
673 to it via attach_inferior.
674 In this case we want the process thread to stop.
675 This is handled by having linux_attach set last_resume_kind ==
676 resume_stop after we return.
678 If the pid we are attaching to is also the tgid, we attach to and
679 stop all the existing threads. Otherwise, we attach to pid and
680 ignore any other threads in the same group as this pid.
682 3) GDB is connecting to gdbserver and is requesting an enumeration of all
684 In this case we want the thread to stop.
685 FIXME: This case is currently not properly handled.
686 We should wait for the SIGSTOP but don't. Things work apparently
687 because enough time passes between when we ptrace (ATTACH) and when
688 gdb makes the next ptrace call on the thread.
690 On the other hand, if we are currently trying to stop all threads, we
691 should treat the new thread as if we had sent it a SIGSTOP. This works
692 because we are guaranteed that the add_lwp call above added us to the
693 end of the list, and so the new thread has not yet reached
694 wait_for_sigstop (but will). */
695 new_lwp
->stop_expected
= 1;
699 linux_attach_lwp (unsigned long lwpid
)
701 linux_attach_lwp_1 (lwpid
, 0);
704 /* Attach to PID. If PID is the tgid, attach to it and all
708 linux_attach (unsigned long pid
)
710 /* Attach to PID. We will check for other threads
712 linux_attach_lwp_1 (pid
, 1);
713 linux_add_process (pid
, 1);
717 struct thread_info
*thread
;
719 /* Don't ignore the initial SIGSTOP if we just attached to this
720 process. It will be collected by wait shortly. */
721 thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
722 thread
->last_resume_kind
= resume_stop
;
725 if (linux_proc_get_tgid (pid
) == pid
)
730 sprintf (pathname
, "/proc/%ld/task", pid
);
732 dir
= opendir (pathname
);
736 fprintf (stderr
, "Could not open /proc/%ld/task.\n", pid
);
741 /* At this point we attached to the tgid. Scan the task for
744 int new_threads_found
;
748 while (iterations
< 2)
750 new_threads_found
= 0;
751 /* Add all the other threads. While we go through the
752 threads, new threads may be spawned. Cycle through
753 the list of threads until we have done two iterations without
754 finding new threads. */
755 while ((dp
= readdir (dir
)) != NULL
)
758 lwp
= strtoul (dp
->d_name
, NULL
, 10);
760 /* Is this a new thread? */
762 && find_thread_ptid (ptid_build (pid
, lwp
, 0)) == NULL
)
764 linux_attach_lwp_1 (lwp
, 0);
769 Found and attached to new lwp %ld\n", lwp
);
773 if (!new_threads_found
)
794 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
796 struct counter
*counter
= args
;
798 if (ptid_get_pid (entry
->id
) == counter
->pid
)
800 if (++counter
->count
> 1)
808 last_thread_of_process_p (struct thread_info
*thread
)
810 ptid_t ptid
= ((struct inferior_list_entry
*)thread
)->id
;
811 int pid
= ptid_get_pid (ptid
);
812 struct counter counter
= { pid
, 0 };
814 return (find_inferior (&all_threads
,
815 second_thread_of_pid_p
, &counter
) == NULL
);
818 /* Kill the inferior lwp. */
821 linux_kill_one_lwp (struct inferior_list_entry
*entry
, void *args
)
823 struct thread_info
*thread
= (struct thread_info
*) entry
;
824 struct lwp_info
*lwp
= get_thread_lwp (thread
);
826 int pid
= * (int *) args
;
828 if (ptid_get_pid (entry
->id
) != pid
)
831 /* We avoid killing the first thread here, because of a Linux kernel (at
832 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
833 the children get a chance to be reaped, it will remain a zombie
836 if (lwpid_of (lwp
) == pid
)
839 fprintf (stderr
, "lkop: is last of process %s\n",
840 target_pid_to_str (entry
->id
));
846 ptrace (PTRACE_KILL
, lwpid_of (lwp
), 0, 0);
848 /* Make sure it died. The loop is most likely unnecessary. */
849 pid
= linux_wait_for_event (lwp
->head
.id
, &wstat
, __WALL
);
850 } while (pid
> 0 && WIFSTOPPED (wstat
));
858 struct process_info
*process
;
859 struct lwp_info
*lwp
;
863 process
= find_process_pid (pid
);
867 /* If we're killing a running inferior, make sure it is stopped
868 first, as PTRACE_KILL will not work otherwise. */
869 stop_all_lwps (0, NULL
);
871 find_inferior (&all_threads
, linux_kill_one_lwp
, &pid
);
873 /* See the comment in linux_kill_one_lwp. We did not kill the first
874 thread in the list, so do so now. */
875 lwp
= find_lwp_pid (pid_to_ptid (pid
));
880 fprintf (stderr
, "lk_1: cannot find lwp %ld, for pid: %d\n",
881 lwpid_of (lwp
), pid
);
886 fprintf (stderr
, "lk_1: killing lwp %ld, for pid: %d\n",
887 lwpid_of (lwp
), pid
);
891 ptrace (PTRACE_KILL
, lwpid_of (lwp
), 0, 0);
893 /* Make sure it died. The loop is most likely unnecessary. */
894 lwpid
= linux_wait_for_event (lwp
->head
.id
, &wstat
, __WALL
);
895 } while (lwpid
> 0 && WIFSTOPPED (wstat
));
898 the_target
->mourn (process
);
900 /* Since we presently can only stop all lwps of all processes, we
901 need to unstop lwps of other processes. */
902 unstop_all_lwps (0, NULL
);
907 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
909 struct thread_info
*thread
= (struct thread_info
*) entry
;
910 struct lwp_info
*lwp
= get_thread_lwp (thread
);
911 int pid
= * (int *) args
;
913 if (ptid_get_pid (entry
->id
) != pid
)
916 /* If this process is stopped but is expecting a SIGSTOP, then make
917 sure we take care of that now. This isn't absolutely guaranteed
918 to collect the SIGSTOP, but is fairly likely to. */
919 if (lwp
->stop_expected
)
922 /* Clear stop_expected, so that the SIGSTOP will be reported. */
923 lwp
->stop_expected
= 0;
924 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
925 linux_wait_for_event (lwp
->head
.id
, &wstat
, __WALL
);
928 /* Flush any pending changes to the process's registers. */
929 regcache_invalidate_one ((struct inferior_list_entry
*)
930 get_lwp_thread (lwp
));
932 /* Finally, let it resume. */
933 if (the_low_target
.prepare_to_resume
!= NULL
)
934 the_low_target
.prepare_to_resume (lwp
);
935 ptrace (PTRACE_DETACH
, lwpid_of (lwp
), 0, 0);
942 linux_detach (int pid
)
944 struct process_info
*process
;
946 process
= find_process_pid (pid
);
950 /* Stop all threads before detaching. First, ptrace requires that
951 the thread is stopped to sucessfully detach. Second, thread_db
952 may need to uninstall thread event breakpoints from memory, which
953 only works with a stopped process anyway. */
954 stop_all_lwps (0, NULL
);
957 thread_db_detach (process
);
960 /* Stabilize threads (move out of jump pads). */
961 stabilize_threads ();
963 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
965 the_target
->mourn (process
);
967 /* Since we presently can only stop all lwps of all processes, we
968 need to unstop lwps of other processes. */
969 unstop_all_lwps (0, NULL
);
973 /* Remove all LWPs that belong to process PROC from the lwp list. */
976 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
978 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
979 struct process_info
*process
= proc
;
981 if (pid_of (lwp
) == pid_of (process
))
988 linux_mourn (struct process_info
*process
)
990 struct process_info_private
*priv
;
993 thread_db_mourn (process
);
996 find_inferior (&all_lwps
, delete_lwp_callback
, process
);
998 /* Freeing all private data. */
999 priv
= process
->private;
1000 free (priv
->arch_private
);
1002 process
->private = NULL
;
1004 remove_process (process
);
1008 linux_join (int pid
)
1013 ret
= my_waitpid (pid
, &status
, 0);
1014 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1016 } while (ret
!= -1 || errno
!= ECHILD
);
1019 /* Return nonzero if the given thread is still alive. */
1021 linux_thread_alive (ptid_t ptid
)
1023 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1025 /* We assume we always know if a thread exits. If a whole process
1026 exited but we still haven't been able to report it to GDB, we'll
1027 hold on to the last lwp of the dead process. */
1034 /* Return 1 if this lwp has an interesting status pending. */
1036 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1038 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
1039 ptid_t ptid
= * (ptid_t
*) arg
;
1040 struct thread_info
*thread
;
1042 /* Check if we're only interested in events from a specific process
1044 if (!ptid_equal (minus_one_ptid
, ptid
)
1045 && ptid_get_pid (ptid
) != ptid_get_pid (lwp
->head
.id
))
1048 thread
= get_lwp_thread (lwp
);
1050 /* If we got a `vCont;t', but we haven't reported a stop yet, do
1051 report any status pending the LWP may have. */
1052 if (thread
->last_resume_kind
== resume_stop
1053 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
1056 return lwp
->status_pending_p
;
1060 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1062 ptid_t ptid
= *(ptid_t
*) data
;
1065 if (ptid_get_lwp (ptid
) != 0)
1066 lwp
= ptid_get_lwp (ptid
);
1068 lwp
= ptid_get_pid (ptid
);
1070 if (ptid_get_lwp (entry
->id
) == lwp
)
1077 find_lwp_pid (ptid_t ptid
)
1079 return (struct lwp_info
*) find_inferior (&all_lwps
, same_lwp
, &ptid
);
1082 static struct lwp_info
*
1083 linux_wait_for_lwp (ptid_t ptid
, int *wstatp
, int options
)
1086 int to_wait_for
= -1;
1087 struct lwp_info
*child
= NULL
;
1090 fprintf (stderr
, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid
));
1092 if (ptid_equal (ptid
, minus_one_ptid
))
1093 to_wait_for
= -1; /* any child */
1095 to_wait_for
= ptid_get_lwp (ptid
); /* this lwp only */
1101 ret
= my_waitpid (to_wait_for
, wstatp
, options
);
1102 if (ret
== 0 || (ret
== -1 && errno
== ECHILD
&& (options
& WNOHANG
)))
1105 perror_with_name ("waitpid");
1108 && (!WIFSTOPPED (*wstatp
)
1109 || (WSTOPSIG (*wstatp
) != 32
1110 && WSTOPSIG (*wstatp
) != 33)))
1111 fprintf (stderr
, "Got an event from %d (%x)\n", ret
, *wstatp
);
1113 child
= find_lwp_pid (pid_to_ptid (ret
));
1115 /* If we didn't find a process, one of two things presumably happened:
1116 - A process we started and then detached from has exited. Ignore it.
1117 - A process we are controlling has forked and the new child's stop
1118 was reported to us by the kernel. Save its PID. */
1119 if (child
== NULL
&& WIFSTOPPED (*wstatp
))
1121 add_pid_to_list (&stopped_pids
, ret
);
1124 else if (child
== NULL
)
1129 child
->last_status
= *wstatp
;
1131 /* Architecture-specific setup after inferior is running.
1132 This needs to happen after we have attached to the inferior
1133 and it is stopped for the first time, but before we access
1134 any inferior registers. */
1137 the_low_target
.arch_setup ();
1138 #ifdef HAVE_LINUX_REGSETS
1139 memset (disabled_regsets
, 0, num_regsets
);
1144 /* Fetch the possibly triggered data watchpoint info and store it in
1147 On some archs, like x86, that use debug registers to set
1148 watchpoints, it's possible that the way to know which watched
1149 address trapped, is to check the register that is used to select
1150 which address to watch. Problem is, between setting the
1151 watchpoint and reading back which data address trapped, the user
1152 may change the set of watchpoints, and, as a consequence, GDB
1153 changes the debug registers in the inferior. To avoid reading
1154 back a stale stopped-data-address when that happens, we cache in
1155 LP the fact that a watchpoint trapped, and the corresponding data
1156 address, as soon as we see CHILD stop with a SIGTRAP. If GDB
1157 changes the debug registers meanwhile, we have the cached data we
1160 if (WIFSTOPPED (*wstatp
) && WSTOPSIG (*wstatp
) == SIGTRAP
)
1162 if (the_low_target
.stopped_by_watchpoint
== NULL
)
1164 child
->stopped_by_watchpoint
= 0;
1168 struct thread_info
*saved_inferior
;
1170 saved_inferior
= current_inferior
;
1171 current_inferior
= get_lwp_thread (child
);
1173 child
->stopped_by_watchpoint
1174 = the_low_target
.stopped_by_watchpoint ();
1176 if (child
->stopped_by_watchpoint
)
1178 if (the_low_target
.stopped_data_address
!= NULL
)
1179 child
->stopped_data_address
1180 = the_low_target
.stopped_data_address ();
1182 child
->stopped_data_address
= 0;
1185 current_inferior
= saved_inferior
;
1189 /* Store the STOP_PC, with adjustment applied. This depends on the
1190 architecture being defined already (so that CHILD has a valid
1191 regcache), and on LAST_STATUS being set (to check for SIGTRAP or
1193 if (WIFSTOPPED (*wstatp
))
1194 child
->stop_pc
= get_stop_pc (child
);
1197 && WIFSTOPPED (*wstatp
)
1198 && the_low_target
.get_pc
!= NULL
)
1200 struct thread_info
*saved_inferior
= current_inferior
;
1201 struct regcache
*regcache
;
1204 current_inferior
= get_lwp_thread (child
);
1205 regcache
= get_thread_regcache (current_inferior
, 1);
1206 pc
= (*the_low_target
.get_pc
) (regcache
);
1207 fprintf (stderr
, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc
);
1208 current_inferior
= saved_inferior
;
1214 /* This function should only be called if the LWP got a SIGTRAP.
1216 Handle any tracepoint steps or hits. Return true if a tracepoint
1217 event was handled, 0 otherwise. */
1220 handle_tracepoints (struct lwp_info
*lwp
)
1222 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1223 int tpoint_related_event
= 0;
1225 /* If this tracepoint hit causes a tracing stop, we'll immediately
1226 uninsert tracepoints. To do this, we temporarily pause all
1227 threads, unpatch away, and then unpause threads. We need to make
1228 sure the unpausing doesn't resume LWP too. */
1231 /* And we need to be sure that any all-threads-stopping doesn't try
1232 to move threads out of the jump pads, as it could deadlock the
1233 inferior (LWP could be in the jump pad, maybe even holding the
1236 /* Do any necessary step collect actions. */
1237 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1239 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1241 /* See if we just hit a tracepoint and do its main collect
1243 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1247 gdb_assert (lwp
->suspended
== 0);
1248 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
1250 if (tpoint_related_event
)
1253 fprintf (stderr
, "got a tracepoint event\n");
1260 /* Convenience wrapper. Returns true if LWP is presently collecting a
1264 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
1265 struct fast_tpoint_collect_status
*status
)
1267 CORE_ADDR thread_area
;
1269 if (the_low_target
.get_thread_area
== NULL
)
1272 /* Get the thread area address. This is used to recognize which
1273 thread is which when tracing with the in-process agent library.
1274 We don't read anything from the address, and treat it as opaque;
1275 it's the address itself that we assume is unique per-thread. */
1276 if ((*the_low_target
.get_thread_area
) (lwpid_of (lwp
), &thread_area
) == -1)
1279 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1282 /* The reason we resume in the caller, is because we want to be able
1283 to pass lwp->status_pending as WSTAT, and we need to clear
1284 status_pending_p before resuming, otherwise, linux_resume_one_lwp
1285 refuses to resume. */
1288 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
1290 struct thread_info
*saved_inferior
;
1292 saved_inferior
= current_inferior
;
1293 current_inferior
= get_lwp_thread (lwp
);
1296 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
1297 && supports_fast_tracepoints ()
1298 && in_process_agent_loaded ())
1300 struct fast_tpoint_collect_status status
;
1305 Checking whether LWP %ld needs to move out of the jump pad.\n",
1308 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
1311 || (WSTOPSIG (*wstat
) != SIGILL
1312 && WSTOPSIG (*wstat
) != SIGFPE
1313 && WSTOPSIG (*wstat
) != SIGSEGV
1314 && WSTOPSIG (*wstat
) != SIGBUS
))
1316 lwp
->collecting_fast_tracepoint
= r
;
1320 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
1322 /* Haven't executed the original instruction yet.
1323 Set breakpoint there, and wait till it's hit,
1324 then single-step until exiting the jump pad. */
1325 lwp
->exit_jump_pad_bkpt
1326 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
1331 Checking whether LWP %ld needs to move out of the jump pad...it does\n",
1333 current_inferior
= saved_inferior
;
1340 /* If we get a synchronous signal while collecting, *and*
1341 while executing the (relocated) original instruction,
1342 reset the PC to point at the tpoint address, before
1343 reporting to GDB. Otherwise, it's an IPA lib bug: just
1344 report the signal to GDB, and pray for the best. */
1346 lwp
->collecting_fast_tracepoint
= 0;
1349 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
1350 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
1353 struct regcache
*regcache
;
1355 /* The si_addr on a few signals references the address
1356 of the faulting instruction. Adjust that as
1358 if ((WSTOPSIG (*wstat
) == SIGILL
1359 || WSTOPSIG (*wstat
) == SIGFPE
1360 || WSTOPSIG (*wstat
) == SIGBUS
1361 || WSTOPSIG (*wstat
) == SIGSEGV
)
1362 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (lwp
), 0, &info
) == 0
1363 /* Final check just to make sure we don't clobber
1364 the siginfo of non-kernel-sent signals. */
1365 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
1367 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
1368 ptrace (PTRACE_SETSIGINFO
, lwpid_of (lwp
), 0, &info
);
1371 regcache
= get_thread_regcache (get_lwp_thread (lwp
), 1);
1372 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
1373 lwp
->stop_pc
= status
.tpoint_addr
;
1375 /* Cancel any fast tracepoint lock this thread was
1377 force_unlock_trace_buffer ();
1380 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
1384 "Cancelling fast exit-jump-pad: removing bkpt. "
1385 "stopping all threads momentarily.\n");
1387 stop_all_lwps (1, lwp
);
1388 cancel_breakpoints ();
1390 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
1391 lwp
->exit_jump_pad_bkpt
= NULL
;
1393 unstop_all_lwps (1, lwp
);
1395 gdb_assert (lwp
->suspended
>= 0);
1402 Checking whether LWP %ld needs to move out of the jump pad...no\n",
1405 current_inferior
= saved_inferior
;
1409 /* Enqueue one signal in the "signals to report later when out of the
1413 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1415 struct pending_signals
*p_sig
;
1419 Deferring signal %d for LWP %ld.\n", WSTOPSIG (*wstat
), lwpid_of (lwp
));
1423 struct pending_signals
*sig
;
1425 for (sig
= lwp
->pending_signals_to_report
;
1429 " Already queued %d\n",
1432 fprintf (stderr
, " (no more currently queued signals)\n");
1435 /* Don't enqueue non-RT signals if they are already in the deferred
1436 queue. (SIGSTOP being the easiest signal to see ending up here
1438 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
1440 struct pending_signals
*sig
;
1442 for (sig
= lwp
->pending_signals_to_report
;
1446 if (sig
->signal
== WSTOPSIG (*wstat
))
1450 "Not requeuing already queued non-RT signal %d"
1459 p_sig
= xmalloc (sizeof (*p_sig
));
1460 p_sig
->prev
= lwp
->pending_signals_to_report
;
1461 p_sig
->signal
= WSTOPSIG (*wstat
);
1462 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
1463 ptrace (PTRACE_GETSIGINFO
, lwpid_of (lwp
), 0, &p_sig
->info
);
1465 lwp
->pending_signals_to_report
= p_sig
;
1468 /* Dequeue one signal from the "signals to report later when out of
1469 the jump pad" list. */
1472 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1474 if (lwp
->pending_signals_to_report
!= NULL
)
1476 struct pending_signals
**p_sig
;
1478 p_sig
= &lwp
->pending_signals_to_report
;
1479 while ((*p_sig
)->prev
!= NULL
)
1480 p_sig
= &(*p_sig
)->prev
;
1482 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
1483 if ((*p_sig
)->info
.si_signo
!= 0)
1484 ptrace (PTRACE_SETSIGINFO
, lwpid_of (lwp
), 0, &(*p_sig
)->info
);
1489 fprintf (stderr
, "Reporting deferred signal %d for LWP %ld.\n",
1490 WSTOPSIG (*wstat
), lwpid_of (lwp
));
1494 struct pending_signals
*sig
;
1496 for (sig
= lwp
->pending_signals_to_report
;
1500 " Still queued %d\n",
1503 fprintf (stderr
, " (no more queued signals)\n");
1512 /* Arrange for a breakpoint to be hit again later. We don't keep the
1513 SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We
1514 will handle the current event, eventually we will resume this LWP,
1515 and this breakpoint will trap again. */
1518 cancel_breakpoint (struct lwp_info
*lwp
)
1520 struct thread_info
*saved_inferior
;
1522 /* There's nothing to do if we don't support breakpoints. */
1523 if (!supports_breakpoints ())
1526 /* breakpoint_at reads from current inferior. */
1527 saved_inferior
= current_inferior
;
1528 current_inferior
= get_lwp_thread (lwp
);
1530 if ((*the_low_target
.breakpoint_at
) (lwp
->stop_pc
))
1534 "CB: Push back breakpoint for %s\n",
1535 target_pid_to_str (ptid_of (lwp
)));
1537 /* Back up the PC if necessary. */
1538 if (the_low_target
.decr_pc_after_break
)
1540 struct regcache
*regcache
1541 = get_thread_regcache (current_inferior
, 1);
1542 (*the_low_target
.set_pc
) (regcache
, lwp
->stop_pc
);
1545 current_inferior
= saved_inferior
;
1552 "CB: No breakpoint found at %s for [%s]\n",
1553 paddress (lwp
->stop_pc
),
1554 target_pid_to_str (ptid_of (lwp
)));
1557 current_inferior
= saved_inferior
;
1561 /* When the event-loop is doing a step-over, this points at the thread
1563 ptid_t step_over_bkpt
;
1565 /* Wait for an event from child PID. If PID is -1, wait for any
1566 child. Store the stop status through the status pointer WSTAT.
1567 OPTIONS is passed to the waitpid call. Return 0 if no child stop
1568 event was found and OPTIONS contains WNOHANG. Return the PID of
1569 the stopped child otherwise. */
1572 linux_wait_for_event_1 (ptid_t ptid
, int *wstat
, int options
)
1574 struct lwp_info
*event_child
, *requested_child
;
1577 requested_child
= NULL
;
1579 /* Check for a lwp with a pending status. */
1581 if (ptid_equal (ptid
, minus_one_ptid
)
1582 || ptid_equal (pid_to_ptid (ptid_get_pid (ptid
)), ptid
))
1584 event_child
= (struct lwp_info
*)
1585 find_inferior (&all_lwps
, status_pending_p_callback
, &ptid
);
1586 if (debug_threads
&& event_child
)
1587 fprintf (stderr
, "Got a pending child %ld\n", lwpid_of (event_child
));
1591 requested_child
= find_lwp_pid (ptid
);
1593 if (!stopping_threads
1594 && requested_child
->status_pending_p
1595 && requested_child
->collecting_fast_tracepoint
)
1597 enqueue_one_deferred_signal (requested_child
,
1598 &requested_child
->status_pending
);
1599 requested_child
->status_pending_p
= 0;
1600 requested_child
->status_pending
= 0;
1601 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
1604 if (requested_child
->suspended
1605 && requested_child
->status_pending_p
)
1606 fatal ("requesting an event out of a suspended child?");
1608 if (requested_child
->status_pending_p
)
1609 event_child
= requested_child
;
1612 if (event_child
!= NULL
)
1615 fprintf (stderr
, "Got an event from pending child %ld (%04x)\n",
1616 lwpid_of (event_child
), event_child
->status_pending
);
1617 *wstat
= event_child
->status_pending
;
1618 event_child
->status_pending_p
= 0;
1619 event_child
->status_pending
= 0;
1620 current_inferior
= get_lwp_thread (event_child
);
1621 return lwpid_of (event_child
);
1624 /* We only enter this loop if no process has a pending wait status. Thus
1625 any action taken in response to a wait status inside this loop is
1626 responding as soon as we detect the status, not after any pending
1630 event_child
= linux_wait_for_lwp (ptid
, wstat
, options
);
1632 if ((options
& WNOHANG
) && event_child
== NULL
)
1635 fprintf (stderr
, "WNOHANG set, no event found\n");
1639 if (event_child
== NULL
)
1640 error ("event from unknown child");
1642 current_inferior
= get_lwp_thread (event_child
);
1644 /* Check for thread exit. */
1645 if (! WIFSTOPPED (*wstat
))
1648 fprintf (stderr
, "LWP %ld exiting\n", lwpid_of (event_child
));
1650 /* If the last thread is exiting, just return. */
1651 if (last_thread_of_process_p (current_inferior
))
1654 fprintf (stderr
, "LWP %ld is last lwp of process\n",
1655 lwpid_of (event_child
));
1656 return lwpid_of (event_child
);
1661 current_inferior
= (struct thread_info
*) all_threads
.head
;
1663 fprintf (stderr
, "Current inferior is now %ld\n",
1664 lwpid_of (get_thread_lwp (current_inferior
)));
1668 current_inferior
= NULL
;
1670 fprintf (stderr
, "Current inferior is now <NULL>\n");
1673 /* If we were waiting for this particular child to do something...
1674 well, it did something. */
1675 if (requested_child
!= NULL
)
1677 int lwpid
= lwpid_of (event_child
);
1679 /* Cancel the step-over operation --- the thread that
1680 started it is gone. */
1681 if (finish_step_over (event_child
))
1682 unstop_all_lwps (1, event_child
);
1683 delete_lwp (event_child
);
1687 delete_lwp (event_child
);
1689 /* Wait for a more interesting event. */
1693 if (event_child
->must_set_ptrace_flags
)
1695 linux_enable_event_reporting (lwpid_of (event_child
));
1696 event_child
->must_set_ptrace_flags
= 0;
1699 if (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) == SIGTRAP
1700 && *wstat
>> 16 != 0)
1702 handle_extended_wait (event_child
, *wstat
);
1706 if (WIFSTOPPED (*wstat
)
1707 && WSTOPSIG (*wstat
) == SIGSTOP
1708 && event_child
->stop_expected
)
1713 fprintf (stderr
, "Expected stop.\n");
1714 event_child
->stop_expected
= 0;
1716 should_stop
= (current_inferior
->last_resume_kind
== resume_stop
1717 || stopping_threads
);
1721 linux_resume_one_lwp (event_child
,
1722 event_child
->stepping
, 0, NULL
);
1727 return lwpid_of (event_child
);
1735 linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
)
1739 if (ptid_is_pid (ptid
))
1741 /* A request to wait for a specific tgid. This is not possible
1742 with waitpid, so instead, we wait for any child, and leave
1743 children we're not interested in right now with a pending
1744 status to report later. */
1745 wait_ptid
= minus_one_ptid
;
1754 event_pid
= linux_wait_for_event_1 (wait_ptid
, wstat
, options
);
1757 && ptid_is_pid (ptid
) && ptid_get_pid (ptid
) != event_pid
)
1759 struct lwp_info
*event_child
1760 = find_lwp_pid (pid_to_ptid (event_pid
));
1762 if (! WIFSTOPPED (*wstat
))
1763 mark_lwp_dead (event_child
, *wstat
);
1766 event_child
->status_pending_p
= 1;
1767 event_child
->status_pending
= *wstat
;
1776 /* Count the LWP's that have had events. */
1779 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
1781 struct lwp_info
*lp
= (struct lwp_info
*) entry
;
1782 struct thread_info
*thread
= get_lwp_thread (lp
);
1785 gdb_assert (count
!= NULL
);
1787 /* Count only resumed LWPs that have a SIGTRAP event pending that
1788 should be reported to GDB. */
1789 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
1790 && thread
->last_resume_kind
!= resume_stop
1791 && lp
->status_pending_p
1792 && WIFSTOPPED (lp
->status_pending
)
1793 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
1794 && !breakpoint_inserted_here (lp
->stop_pc
))
1800 /* Select the LWP (if any) that is currently being single-stepped. */
1803 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
1805 struct lwp_info
*lp
= (struct lwp_info
*) entry
;
1806 struct thread_info
*thread
= get_lwp_thread (lp
);
1808 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
1809 && thread
->last_resume_kind
== resume_step
1810 && lp
->status_pending_p
)
1816 /* Select the Nth LWP that has had a SIGTRAP event that should be
1820 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
1822 struct lwp_info
*lp
= (struct lwp_info
*) entry
;
1823 struct thread_info
*thread
= get_lwp_thread (lp
);
1824 int *selector
= data
;
1826 gdb_assert (selector
!= NULL
);
1828 /* Select only resumed LWPs that have a SIGTRAP event pending. */
1829 if (thread
->last_resume_kind
!= resume_stop
1830 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
1831 && lp
->status_pending_p
1832 && WIFSTOPPED (lp
->status_pending
)
1833 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
1834 && !breakpoint_inserted_here (lp
->stop_pc
))
1835 if ((*selector
)-- == 0)
1842 cancel_breakpoints_callback (struct inferior_list_entry
*entry
, void *data
)
1844 struct lwp_info
*lp
= (struct lwp_info
*) entry
;
1845 struct thread_info
*thread
= get_lwp_thread (lp
);
1846 struct lwp_info
*event_lp
= data
;
1848 /* Leave the LWP that has been elected to receive a SIGTRAP alone. */
1852 /* If a LWP other than the LWP that we're reporting an event for has
1853 hit a GDB breakpoint (as opposed to some random trap signal),
1854 then just arrange for it to hit it again later. We don't keep
1855 the SIGTRAP status and don't forward the SIGTRAP signal to the
1856 LWP. We will handle the current event, eventually we will resume
1857 all LWPs, and this one will get its breakpoint trap again.
1859 If we do not do this, then we run the risk that the user will
1860 delete or disable the breakpoint, but the LWP will have already
1863 if (thread
->last_resume_kind
!= resume_stop
1864 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
1865 && lp
->status_pending_p
1866 && WIFSTOPPED (lp
->status_pending
)
1867 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
1869 && !lp
->stopped_by_watchpoint
1870 && cancel_breakpoint (lp
))
1871 /* Throw away the SIGTRAP. */
1872 lp
->status_pending_p
= 0;
1878 linux_cancel_breakpoints (void)
1880 find_inferior (&all_lwps
, cancel_breakpoints_callback
, NULL
);
1883 /* Select one LWP out of those that have events pending. */
1886 select_event_lwp (struct lwp_info
**orig_lp
)
1889 int random_selector
;
1890 struct lwp_info
*event_lp
;
1892 /* Give preference to any LWP that is being single-stepped. */
1894 = (struct lwp_info
*) find_inferior (&all_lwps
,
1895 select_singlestep_lwp_callback
, NULL
);
1896 if (event_lp
!= NULL
)
1900 "SEL: Select single-step %s\n",
1901 target_pid_to_str (ptid_of (event_lp
)));
1905 /* No single-stepping LWP. Select one at random, out of those
1906 which have had SIGTRAP events. */
1908 /* First see how many SIGTRAP events we have. */
1909 find_inferior (&all_lwps
, count_events_callback
, &num_events
);
1911 /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
1912 random_selector
= (int)
1913 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
1915 if (debug_threads
&& num_events
> 1)
1917 "SEL: Found %d SIGTRAP events, selecting #%d\n",
1918 num_events
, random_selector
);
1920 event_lp
= (struct lwp_info
*) find_inferior (&all_lwps
,
1921 select_event_lwp_callback
,
1925 if (event_lp
!= NULL
)
1927 /* Switch the event LWP. */
1928 *orig_lp
= event_lp
;
1932 /* Decrement the suspend count of an LWP. */
1935 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
1937 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
1939 /* Ignore EXCEPT. */
1945 gdb_assert (lwp
->suspended
>= 0);
1949 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
1953 unsuspend_all_lwps (struct lwp_info
*except
)
1955 find_inferior (&all_lwps
, unsuspend_one_lwp
, except
);
1958 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
1959 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
1961 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
1962 static ptid_t
linux_wait_1 (ptid_t ptid
,
1963 struct target_waitstatus
*ourstatus
,
1964 int target_options
);
1966 /* Stabilize threads (move out of jump pads).
1968 If a thread is midway collecting a fast tracepoint, we need to
1969 finish the collection and move it out of the jump pad before
1970 reporting the signal.
1972 This avoids recursion while collecting (when a signal arrives
1973 midway, and the signal handler itself collects), which would trash
1974 the trace buffer. In case the user set a breakpoint in a signal
1975 handler, this avoids the backtrace showing the jump pad, etc..
1976 Most importantly, there are certain things we can't do safely if
1977 threads are stopped in a jump pad (or in its callee's). For
1980 - starting a new trace run. A thread still collecting the
1981 previous run, could trash the trace buffer when resumed. The trace
1982 buffer control structures would have been reset but the thread had
1983 no way to tell. The thread could even midway memcpy'ing to the
1984 buffer, which would mean that when resumed, it would clobber the
1985 trace buffer that had been set for a new run.
1987 - we can't rewrite/reuse the jump pads for new tracepoints
1988 safely. Say you do tstart while a thread is stopped midway while
1989 collecting. When the thread is later resumed, it finishes the
1990 collection, and returns to the jump pad, to execute the original
1991 instruction that was under the tracepoint jump at the time the
1992 older run had been started. If the jump pad had been rewritten
1993 since for something else in the new run, the thread would now
1994 execute the wrong / random instructions. */
1997 linux_stabilize_threads (void)
1999 struct thread_info
*save_inferior
;
2000 struct lwp_info
*lwp_stuck
;
2003 = (struct lwp_info
*) find_inferior (&all_lwps
,
2004 stuck_in_jump_pad_callback
, NULL
);
2005 if (lwp_stuck
!= NULL
)
2008 fprintf (stderr
, "can't stabilize, LWP %ld is stuck in jump pad\n",
2009 lwpid_of (lwp_stuck
));
2013 save_inferior
= current_inferior
;
2015 stabilizing_threads
= 1;
2018 for_each_inferior (&all_lwps
, move_out_of_jump_pad_callback
);
2020 /* Loop until all are stopped out of the jump pads. */
2021 while (find_inferior (&all_lwps
, lwp_running
, NULL
) != NULL
)
2023 struct target_waitstatus ourstatus
;
2024 struct lwp_info
*lwp
;
2027 /* Note that we go through the full wait even loop. While
2028 moving threads out of jump pad, we need to be able to step
2029 over internal breakpoints and such. */
2030 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2032 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2034 lwp
= get_thread_lwp (current_inferior
);
2039 if (ourstatus
.value
.sig
!= TARGET_SIGNAL_0
2040 || current_inferior
->last_resume_kind
== resume_stop
)
2042 wstat
= W_STOPCODE (target_signal_to_host (ourstatus
.value
.sig
));
2043 enqueue_one_deferred_signal (lwp
, &wstat
);
2048 find_inferior (&all_lwps
, unsuspend_one_lwp
, NULL
);
2050 stabilizing_threads
= 0;
2052 current_inferior
= save_inferior
;
2057 = (struct lwp_info
*) find_inferior (&all_lwps
,
2058 stuck_in_jump_pad_callback
, NULL
);
2059 if (lwp_stuck
!= NULL
)
2060 fprintf (stderr
, "couldn't stabilize, LWP %ld got stuck in jump pad\n",
2061 lwpid_of (lwp_stuck
));
2065 /* Wait for process, returns status. */
2068 linux_wait_1 (ptid_t ptid
,
2069 struct target_waitstatus
*ourstatus
, int target_options
)
2072 struct lwp_info
*event_child
;
2075 int step_over_finished
;
2076 int bp_explains_trap
;
2077 int maybe_internal_trap
;
2081 /* Translate generic target options into linux options. */
2083 if (target_options
& TARGET_WNOHANG
)
2087 bp_explains_trap
= 0;
2089 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2091 /* If we were only supposed to resume one thread, only wait for
2092 that thread - if it's still alive. If it died, however - which
2093 can happen if we're coming from the thread death case below -
2094 then we need to make sure we restart the other threads. We could
2095 pick a thread at random or restart all; restarting all is less
2098 && !ptid_equal (cont_thread
, null_ptid
)
2099 && !ptid_equal (cont_thread
, minus_one_ptid
))
2101 struct thread_info
*thread
;
2103 thread
= (struct thread_info
*) find_inferior_id (&all_threads
,
2106 /* No stepping, no signal - unless one is pending already, of course. */
2109 struct thread_resume resume_info
;
2110 resume_info
.thread
= minus_one_ptid
;
2111 resume_info
.kind
= resume_continue
;
2112 resume_info
.sig
= 0;
2113 linux_resume (&resume_info
, 1);
2119 if (ptid_equal (step_over_bkpt
, null_ptid
))
2120 pid
= linux_wait_for_event (ptid
, &w
, options
);
2124 fprintf (stderr
, "step_over_bkpt set [%s], doing a blocking wait\n",
2125 target_pid_to_str (step_over_bkpt
));
2126 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
2129 if (pid
== 0) /* only if TARGET_WNOHANG */
2132 event_child
= get_thread_lwp (current_inferior
);
2134 /* If we are waiting for a particular child, and it exited,
2135 linux_wait_for_event will return its exit status. Similarly if
2136 the last child exited. If this is not the last child, however,
2137 do not report it as exited until there is a 'thread exited' response
2138 available in the remote protocol. Instead, just wait for another event.
2139 This should be safe, because if the thread crashed we will already
2140 have reported the termination signal to GDB; that should stop any
2141 in-progress stepping operations, etc.
2143 Report the exit status of the last thread to exit. This matches
2144 LinuxThreads' behavior. */
2146 if (last_thread_of_process_p (current_inferior
))
2148 if (WIFEXITED (w
) || WIFSIGNALED (w
))
2152 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
2153 ourstatus
->value
.integer
= WEXITSTATUS (w
);
2157 "\nChild exited with retcode = %x \n",
2162 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
2163 ourstatus
->value
.sig
= target_signal_from_host (WTERMSIG (w
));
2167 "\nChild terminated with signal = %x \n",
2172 return ptid_of (event_child
);
2177 if (!WIFSTOPPED (w
))
2181 /* If this event was not handled before, and is not a SIGTRAP, we
2182 report it. SIGILL and SIGSEGV are also treated as traps in case
2183 a breakpoint is inserted at the current PC. If this target does
2184 not support internal breakpoints at all, we also report the
2185 SIGTRAP without further processing; it's of no concern to us. */
2187 = (supports_breakpoints ()
2188 && (WSTOPSIG (w
) == SIGTRAP
2189 || ((WSTOPSIG (w
) == SIGILL
2190 || WSTOPSIG (w
) == SIGSEGV
)
2191 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
2193 if (maybe_internal_trap
)
2195 /* Handle anything that requires bookkeeping before deciding to
2196 report the event or continue waiting. */
2198 /* First check if we can explain the SIGTRAP with an internal
2199 breakpoint, or if we should possibly report the event to GDB.
2200 Do this before anything that may remove or insert a
2202 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
2204 /* We have a SIGTRAP, possibly a step-over dance has just
2205 finished. If so, tweak the state machine accordingly,
2206 reinsert breakpoints and delete any reinsert (software
2207 single-step) breakpoints. */
2208 step_over_finished
= finish_step_over (event_child
);
2210 /* Now invoke the callbacks of any internal breakpoints there. */
2211 check_breakpoints (event_child
->stop_pc
);
2213 /* Handle tracepoint data collecting. This may overflow the
2214 trace buffer, and cause a tracing stop, removing
2216 trace_event
= handle_tracepoints (event_child
);
2218 if (bp_explains_trap
)
2220 /* If we stepped or ran into an internal breakpoint, we've
2221 already handled it. So next time we resume (from this
2222 PC), we should step over it. */
2224 fprintf (stderr
, "Hit a gdbserver breakpoint.\n");
2226 if (breakpoint_here (event_child
->stop_pc
))
2227 event_child
->need_step_over
= 1;
2232 /* We have some other signal, possibly a step-over dance was in
2233 progress, and it should be cancelled too. */
2234 step_over_finished
= finish_step_over (event_child
);
2237 /* We have all the data we need. Either report the event to GDB, or
2238 resume threads and keep waiting for more. */
2240 /* If we're collecting a fast tracepoint, finish the collection and
2241 move out of the jump pad before delivering a signal. See
2242 linux_stabilize_threads. */
2245 && WSTOPSIG (w
) != SIGTRAP
2246 && supports_fast_tracepoints ()
2247 && in_process_agent_loaded ())
2251 "Got signal %d for LWP %ld. Check if we need "
2252 "to defer or adjust it.\n",
2253 WSTOPSIG (w
), lwpid_of (event_child
));
2255 /* Allow debugging the jump pad itself. */
2256 if (current_inferior
->last_resume_kind
!= resume_step
2257 && maybe_move_out_of_jump_pad (event_child
, &w
))
2259 enqueue_one_deferred_signal (event_child
, &w
);
2263 "Signal %d for LWP %ld deferred (in jump pad)\n",
2264 WSTOPSIG (w
), lwpid_of (event_child
));
2266 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
2271 if (event_child
->collecting_fast_tracepoint
)
2275 LWP %ld was trying to move out of the jump pad (%d). \
2276 Check if we're already there.\n",
2277 lwpid_of (event_child
),
2278 event_child
->collecting_fast_tracepoint
);
2282 event_child
->collecting_fast_tracepoint
2283 = linux_fast_tracepoint_collecting (event_child
, NULL
);
2285 if (event_child
->collecting_fast_tracepoint
!= 1)
2287 /* No longer need this breakpoint. */
2288 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
2292 "No longer need exit-jump-pad bkpt; removing it."
2293 "stopping all threads momentarily.\n");
2295 /* Other running threads could hit this breakpoint.
2296 We don't handle moribund locations like GDB does,
2297 instead we always pause all threads when removing
2298 breakpoints, so that any step-over or
2299 decr_pc_after_break adjustment is always taken
2300 care of while the breakpoint is still
2302 stop_all_lwps (1, event_child
);
2303 cancel_breakpoints ();
2305 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
2306 event_child
->exit_jump_pad_bkpt
= NULL
;
2308 unstop_all_lwps (1, event_child
);
2310 gdb_assert (event_child
->suspended
>= 0);
2314 if (event_child
->collecting_fast_tracepoint
== 0)
2318 "fast tracepoint finished "
2319 "collecting successfully.\n");
2321 /* We may have a deferred signal to report. */
2322 if (dequeue_one_deferred_signal (event_child
, &w
))
2325 fprintf (stderr
, "dequeued one signal.\n");
2330 fprintf (stderr
, "no deferred signals.\n");
2332 if (stabilizing_threads
)
2334 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2335 ourstatus
->value
.sig
= TARGET_SIGNAL_0
;
2336 return ptid_of (event_child
);
2342 /* Check whether GDB would be interested in this event. */
2344 /* If GDB is not interested in this signal, don't stop other
2345 threads, and don't report it to GDB. Just resume the inferior
2346 right away. We do this for threading-related signals as well as
2347 any that GDB specifically requested we ignore. But never ignore
2348 SIGSTOP if we sent it ourselves, and do not ignore signals when
2349 stepping - they may require special handling to skip the signal
2351 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
2354 && current_inferior
->last_resume_kind
!= resume_step
2356 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
2357 (current_process ()->private->thread_db
!= NULL
2358 && (WSTOPSIG (w
) == __SIGRTMIN
2359 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
2362 (pass_signals
[target_signal_from_host (WSTOPSIG (w
))]
2363 && !(WSTOPSIG (w
) == SIGSTOP
2364 && current_inferior
->last_resume_kind
== resume_stop
))))
2366 siginfo_t info
, *info_p
;
2369 fprintf (stderr
, "Ignored signal %d for LWP %ld.\n",
2370 WSTOPSIG (w
), lwpid_of (event_child
));
2372 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (event_child
), 0, &info
) == 0)
2376 linux_resume_one_lwp (event_child
, event_child
->stepping
,
2377 WSTOPSIG (w
), info_p
);
2381 /* If GDB wanted this thread to single step, we always want to
2382 report the SIGTRAP, and let GDB handle it. Watchpoints should
2383 always be reported. So should signals we can't explain. A
2384 SIGTRAP we can't explain could be a GDB breakpoint --- we may or
2385 not support Z0 breakpoints. If we do, we're be able to handle
2386 GDB breakpoints on top of internal breakpoints, by handling the
2387 internal breakpoint and still reporting the event to GDB. If we
2388 don't, we're out of luck, GDB won't see the breakpoint hit. */
2389 report_to_gdb
= (!maybe_internal_trap
2390 || current_inferior
->last_resume_kind
== resume_step
2391 || event_child
->stopped_by_watchpoint
2392 || (!step_over_finished
2393 && !bp_explains_trap
&& !trace_event
)
2394 || gdb_breakpoint_here (event_child
->stop_pc
));
2396 /* We found no reason GDB would want us to stop. We either hit one
2397 of our own breakpoints, or finished an internal step GDB
2398 shouldn't know about. */
2403 if (bp_explains_trap
)
2404 fprintf (stderr
, "Hit a gdbserver breakpoint.\n");
2405 if (step_over_finished
)
2406 fprintf (stderr
, "Step-over finished.\n");
2408 fprintf (stderr
, "Tracepoint event.\n");
2411 /* We're not reporting this breakpoint to GDB, so apply the
2412 decr_pc_after_break adjustment to the inferior's regcache
2415 if (the_low_target
.set_pc
!= NULL
)
2417 struct regcache
*regcache
2418 = get_thread_regcache (get_lwp_thread (event_child
), 1);
2419 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
2422 /* We may have finished stepping over a breakpoint. If so,
2423 we've stopped and suspended all LWPs momentarily except the
2424 stepping one. This is where we resume them all again. We're
2425 going to keep waiting, so use proceed, which handles stepping
2426 over the next breakpoint. */
2428 fprintf (stderr
, "proceeding all threads.\n");
2430 if (step_over_finished
)
2431 unsuspend_all_lwps (event_child
);
2433 proceed_all_lwps ();
2439 if (current_inferior
->last_resume_kind
== resume_step
)
2440 fprintf (stderr
, "GDB wanted to single-step, reporting event.\n");
2441 if (event_child
->stopped_by_watchpoint
)
2442 fprintf (stderr
, "Stopped by watchpoint.\n");
2443 if (gdb_breakpoint_here (event_child
->stop_pc
))
2444 fprintf (stderr
, "Stopped by GDB breakpoint.\n");
2446 fprintf (stderr
, "Hit a non-gdbserver trap event.\n");
2449 /* Alright, we're going to report a stop. */
2451 if (!non_stop
&& !stabilizing_threads
)
2453 /* In all-stop, stop all threads. */
2454 stop_all_lwps (0, NULL
);
2456 /* If we're not waiting for a specific LWP, choose an event LWP
2457 from among those that have had events. Giving equal priority
2458 to all LWPs that have had events helps prevent
2460 if (ptid_equal (ptid
, minus_one_ptid
))
2462 event_child
->status_pending_p
= 1;
2463 event_child
->status_pending
= w
;
2465 select_event_lwp (&event_child
);
2467 event_child
->status_pending_p
= 0;
2468 w
= event_child
->status_pending
;
2471 /* Now that we've selected our final event LWP, cancel any
2472 breakpoints in other LWPs that have hit a GDB breakpoint.
2473 See the comment in cancel_breakpoints_callback to find out
2475 find_inferior (&all_lwps
, cancel_breakpoints_callback
, event_child
);
2477 /* Stabilize threads (move out of jump pads). */
2478 stabilize_threads ();
2482 /* If we just finished a step-over, then all threads had been
2483 momentarily paused. In all-stop, that's fine, we want
2484 threads stopped by now anyway. In non-stop, we need to
2485 re-resume threads that GDB wanted to be running. */
2486 if (step_over_finished
)
2487 unstop_all_lwps (1, event_child
);
2490 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2492 if (current_inferior
->last_resume_kind
== resume_stop
2493 && WSTOPSIG (w
) == SIGSTOP
)
2495 /* A thread that has been requested to stop by GDB with vCont;t,
2496 and it stopped cleanly, so report as SIG0. The use of
2497 SIGSTOP is an implementation detail. */
2498 ourstatus
->value
.sig
= TARGET_SIGNAL_0
;
2500 else if (current_inferior
->last_resume_kind
== resume_stop
2501 && WSTOPSIG (w
) != SIGSTOP
)
2503 /* A thread that has been requested to stop by GDB with vCont;t,
2504 but, it stopped for other reasons. */
2505 ourstatus
->value
.sig
= target_signal_from_host (WSTOPSIG (w
));
2509 ourstatus
->value
.sig
= target_signal_from_host (WSTOPSIG (w
));
2512 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
2515 fprintf (stderr
, "linux_wait ret = %s, %d, %d\n",
2516 target_pid_to_str (ptid_of (event_child
)),
2518 ourstatus
->value
.sig
);
2520 return ptid_of (event_child
);
2523 /* Get rid of any pending event in the pipe. */
2525 async_file_flush (void)
2531 ret
= read (linux_event_pipe
[0], &buf
, 1);
2532 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
2535 /* Put something in the pipe, so the event loop wakes up. */
2537 async_file_mark (void)
2541 async_file_flush ();
2544 ret
= write (linux_event_pipe
[1], "+", 1);
2545 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
2547 /* Ignore EAGAIN. If the pipe is full, the event loop will already
2548 be awakened anyway. */
2552 linux_wait (ptid_t ptid
,
2553 struct target_waitstatus
*ourstatus
, int target_options
)
2558 fprintf (stderr
, "linux_wait: [%s]\n", target_pid_to_str (ptid
));
2560 /* Flush the async file first. */
2561 if (target_is_async_p ())
2562 async_file_flush ();
2564 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
2566 /* If at least one stop was reported, there may be more. A single
2567 SIGCHLD can signal more than one child stop. */
2568 if (target_is_async_p ()
2569 && (target_options
& TARGET_WNOHANG
) != 0
2570 && !ptid_equal (event_ptid
, null_ptid
))
2576 /* Send a signal to an LWP. */
2579 kill_lwp (unsigned long lwpid
, int signo
)
2581 /* Use tkill, if possible, in case we are using nptl threads. If tkill
2582 fails, then we are not using nptl threads and we should be using kill. */
2586 static int tkill_failed
;
2593 ret
= syscall (__NR_tkill
, lwpid
, signo
);
2594 if (errno
!= ENOSYS
)
2601 return kill (lwpid
, signo
);
2605 linux_stop_lwp (struct lwp_info
*lwp
)
2611 send_sigstop (struct lwp_info
*lwp
)
2615 pid
= lwpid_of (lwp
);
2617 /* If we already have a pending stop signal for this process, don't
2619 if (lwp
->stop_expected
)
2622 fprintf (stderr
, "Have pending sigstop for lwp %d\n", pid
);
2628 fprintf (stderr
, "Sending sigstop to lwp %d\n", pid
);
2630 lwp
->stop_expected
= 1;
2631 kill_lwp (pid
, SIGSTOP
);
2635 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
2637 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2639 /* Ignore EXCEPT. */
2650 /* Increment the suspend count of an LWP, and stop it, if not stopped
2653 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
2656 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2658 /* Ignore EXCEPT. */
2664 return send_sigstop_callback (entry
, except
);
2668 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
2670 /* It's dead, really. */
2673 /* Store the exit status for later. */
2674 lwp
->status_pending_p
= 1;
2675 lwp
->status_pending
= wstat
;
2677 /* Prevent trying to stop it. */
2680 /* No further stops are expected from a dead lwp. */
2681 lwp
->stop_expected
= 0;
2685 wait_for_sigstop (struct inferior_list_entry
*entry
)
2687 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2688 struct thread_info
*saved_inferior
;
2697 fprintf (stderr
, "wait_for_sigstop: LWP %ld already stopped\n",
2702 saved_inferior
= current_inferior
;
2703 if (saved_inferior
!= NULL
)
2704 saved_tid
= ((struct inferior_list_entry
*) saved_inferior
)->id
;
2706 saved_tid
= null_ptid
; /* avoid bogus unused warning */
2708 ptid
= lwp
->head
.id
;
2711 fprintf (stderr
, "wait_for_sigstop: pulling one event\n");
2713 pid
= linux_wait_for_event (ptid
, &wstat
, __WALL
);
2715 /* If we stopped with a non-SIGSTOP signal, save it for later
2716 and record the pending SIGSTOP. If the process exited, just
2718 if (WIFSTOPPED (wstat
))
2721 fprintf (stderr
, "LWP %ld stopped with signal %d\n",
2722 lwpid_of (lwp
), WSTOPSIG (wstat
));
2724 if (WSTOPSIG (wstat
) != SIGSTOP
)
2727 fprintf (stderr
, "LWP %ld stopped with non-sigstop status %06x\n",
2728 lwpid_of (lwp
), wstat
);
2730 lwp
->status_pending_p
= 1;
2731 lwp
->status_pending
= wstat
;
2737 fprintf (stderr
, "Process %d exited while stopping LWPs\n", pid
);
2739 lwp
= find_lwp_pid (pid_to_ptid (pid
));
2742 /* Leave this status pending for the next time we're able to
2743 report it. In the mean time, we'll report this lwp as
2744 dead to GDB, so GDB doesn't try to read registers and
2745 memory from it. This can only happen if this was the
2746 last thread of the process; otherwise, PID is removed
2747 from the thread tables before linux_wait_for_event
2749 mark_lwp_dead (lwp
, wstat
);
2753 if (saved_inferior
== NULL
|| linux_thread_alive (saved_tid
))
2754 current_inferior
= saved_inferior
;
2758 fprintf (stderr
, "Previously current thread died.\n");
2762 /* We can't change the current inferior behind GDB's back,
2763 otherwise, a subsequent command may apply to the wrong
2765 current_inferior
= NULL
;
2769 /* Set a valid thread as current. */
2770 set_desired_inferior (0);
2775 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
2776 move it out, because we need to report the stop event to GDB. For
2777 example, if the user puts a breakpoint in the jump pad, it's
2778 because she wants to debug it. */
2781 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
2783 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2784 struct thread_info
*thread
= get_lwp_thread (lwp
);
2786 gdb_assert (lwp
->suspended
== 0);
2787 gdb_assert (lwp
->stopped
);
2789 /* Allow debugging the jump pad, gdb_collect, etc.. */
2790 return (supports_fast_tracepoints ()
2791 && in_process_agent_loaded ()
2792 && (gdb_breakpoint_here (lwp
->stop_pc
)
2793 || lwp
->stopped_by_watchpoint
2794 || thread
->last_resume_kind
== resume_step
)
2795 && linux_fast_tracepoint_collecting (lwp
, NULL
));
2799 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
2801 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2802 struct thread_info
*thread
= get_lwp_thread (lwp
);
2805 gdb_assert (lwp
->suspended
== 0);
2806 gdb_assert (lwp
->stopped
);
2808 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
2810 /* Allow debugging the jump pad, gdb_collect, etc. */
2811 if (!gdb_breakpoint_here (lwp
->stop_pc
)
2812 && !lwp
->stopped_by_watchpoint
2813 && thread
->last_resume_kind
!= resume_step
2814 && maybe_move_out_of_jump_pad (lwp
, wstat
))
2818 "LWP %ld needs stabilizing (in jump pad)\n",
2823 lwp
->status_pending_p
= 0;
2824 enqueue_one_deferred_signal (lwp
, wstat
);
2828 "Signal %d for LWP %ld deferred "
2830 WSTOPSIG (*wstat
), lwpid_of (lwp
));
2833 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
2840 lwp_running (struct inferior_list_entry
*entry
, void *data
)
2842 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2851 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
2852 If SUSPEND, then also increase the suspend count of every LWP,
2856 stop_all_lwps (int suspend
, struct lwp_info
*except
)
2858 stopping_threads
= 1;
2861 find_inferior (&all_lwps
, suspend_and_send_sigstop_callback
, except
);
2863 find_inferior (&all_lwps
, send_sigstop_callback
, except
);
2864 for_each_inferior (&all_lwps
, wait_for_sigstop
);
2865 stopping_threads
= 0;
2868 /* Resume execution of the inferior process.
2869 If STEP is nonzero, single-step it.
2870 If SIGNAL is nonzero, give it that signal. */
2873 linux_resume_one_lwp (struct lwp_info
*lwp
,
2874 int step
, int signal
, siginfo_t
*info
)
2876 struct thread_info
*saved_inferior
;
2877 int fast_tp_collecting
;
2879 if (lwp
->stopped
== 0)
2882 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
2884 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
2886 /* Cancel actions that rely on GDB not changing the PC (e.g., the
2887 user used the "jump" command, or "set $pc = foo"). */
2888 if (lwp
->stop_pc
!= get_pc (lwp
))
2890 /* Collecting 'while-stepping' actions doesn't make sense
2892 release_while_stepping_state_list (get_lwp_thread (lwp
));
2895 /* If we have pending signals or status, and a new signal, enqueue the
2896 signal. Also enqueue the signal if we are waiting to reinsert a
2897 breakpoint; it will be picked up again below. */
2899 && (lwp
->status_pending_p
2900 || lwp
->pending_signals
!= NULL
2901 || lwp
->bp_reinsert
!= 0
2902 || fast_tp_collecting
))
2904 struct pending_signals
*p_sig
;
2905 p_sig
= xmalloc (sizeof (*p_sig
));
2906 p_sig
->prev
= lwp
->pending_signals
;
2907 p_sig
->signal
= signal
;
2909 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
2911 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
2912 lwp
->pending_signals
= p_sig
;
2915 if (lwp
->status_pending_p
)
2918 fprintf (stderr
, "Not resuming lwp %ld (%s, signal %d, stop %s);"
2919 " has pending status\n",
2920 lwpid_of (lwp
), step
? "step" : "continue", signal
,
2921 lwp
->stop_expected
? "expected" : "not expected");
2925 saved_inferior
= current_inferior
;
2926 current_inferior
= get_lwp_thread (lwp
);
2929 fprintf (stderr
, "Resuming lwp %ld (%s, signal %d, stop %s)\n",
2930 lwpid_of (lwp
), step
? "step" : "continue", signal
,
2931 lwp
->stop_expected
? "expected" : "not expected");
2933 /* This bit needs some thinking about. If we get a signal that
2934 we must report while a single-step reinsert is still pending,
2935 we often end up resuming the thread. It might be better to
2936 (ew) allow a stack of pending events; then we could be sure that
2937 the reinsert happened right away and not lose any signals.
2939 Making this stack would also shrink the window in which breakpoints are
2940 uninserted (see comment in linux_wait_for_lwp) but not enough for
2941 complete correctness, so it won't solve that problem. It may be
2942 worthwhile just to solve this one, however. */
2943 if (lwp
->bp_reinsert
!= 0)
2946 fprintf (stderr
, " pending reinsert at 0x%s\n",
2947 paddress (lwp
->bp_reinsert
));
2949 if (lwp
->bp_reinsert
!= 0 && can_hardware_single_step ())
2951 if (fast_tp_collecting
== 0)
2954 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
2956 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
2963 /* Postpone any pending signal. It was enqueued above. */
2967 if (fast_tp_collecting
== 1)
2971 lwp %ld wants to get out of fast tracepoint jump pad (exit-jump-pad-bkpt)\n",
2974 /* Postpone any pending signal. It was enqueued above. */
2977 else if (fast_tp_collecting
== 2)
2981 lwp %ld wants to get out of fast tracepoint jump pad single-stepping\n",
2984 if (can_hardware_single_step ())
2987 fatal ("moving out of jump pad single-stepping"
2988 " not implemented on this target");
2990 /* Postpone any pending signal. It was enqueued above. */
2994 /* If we have while-stepping actions in this thread set it stepping.
2995 If we have a signal to deliver, it may or may not be set to
2996 SIG_IGN, we don't know. Assume so, and allow collecting
2997 while-stepping into a signal handler. A possible smart thing to
2998 do would be to set an internal breakpoint at the signal return
2999 address, continue, and carry on catching this while-stepping
3000 action only when that breakpoint is hit. A future
3002 if (get_lwp_thread (lwp
)->while_stepping
!= NULL
3003 && can_hardware_single_step ())
3007 "lwp %ld has a while-stepping action -> forcing step.\n",
3012 if (debug_threads
&& the_low_target
.get_pc
!= NULL
)
3014 struct regcache
*regcache
= get_thread_regcache (current_inferior
, 1);
3015 CORE_ADDR pc
= (*the_low_target
.get_pc
) (regcache
);
3016 fprintf (stderr
, " resuming from pc 0x%lx\n", (long) pc
);
3019 /* If we have pending signals, consume one unless we are trying to
3020 reinsert a breakpoint or we're trying to finish a fast tracepoint
3022 if (lwp
->pending_signals
!= NULL
3023 && lwp
->bp_reinsert
== 0
3024 && fast_tp_collecting
== 0)
3026 struct pending_signals
**p_sig
;
3028 p_sig
= &lwp
->pending_signals
;
3029 while ((*p_sig
)->prev
!= NULL
)
3030 p_sig
= &(*p_sig
)->prev
;
3032 signal
= (*p_sig
)->signal
;
3033 if ((*p_sig
)->info
.si_signo
!= 0)
3034 ptrace (PTRACE_SETSIGINFO
, lwpid_of (lwp
), 0, &(*p_sig
)->info
);
3040 if (the_low_target
.prepare_to_resume
!= NULL
)
3041 the_low_target
.prepare_to_resume (lwp
);
3043 regcache_invalidate_one ((struct inferior_list_entry
*)
3044 get_lwp_thread (lwp
));
3047 lwp
->stopped_by_watchpoint
= 0;
3048 lwp
->stepping
= step
;
3049 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (lwp
), 0,
3050 /* Coerce to a uintptr_t first to avoid potential gcc warning
3051 of coercing an 8 byte integer to a 4 byte pointer. */
3052 (PTRACE_ARG4_TYPE
) (uintptr_t) signal
);
3054 current_inferior
= saved_inferior
;
3057 /* ESRCH from ptrace either means that the thread was already
3058 running (an error) or that it is gone (a race condition). If
3059 it's gone, we will get a notification the next time we wait,
3060 so we can ignore the error. We could differentiate these
3061 two, but it's tricky without waiting; the thread still exists
3062 as a zombie, so sending it signal 0 would succeed. So just
3067 perror_with_name ("ptrace");
3071 struct thread_resume_array
3073 struct thread_resume
*resume
;
3077 /* This function is called once per thread. We look up the thread
3078 in RESUME_PTR, and mark the thread with a pointer to the appropriate
3081 This algorithm is O(threads * resume elements), but resume elements
3082 is small (and will remain small at least until GDB supports thread
3085 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
3087 struct lwp_info
*lwp
;
3088 struct thread_info
*thread
;
3090 struct thread_resume_array
*r
;
3092 thread
= (struct thread_info
*) entry
;
3093 lwp
= get_thread_lwp (thread
);
3096 for (ndx
= 0; ndx
< r
->n
; ndx
++)
3098 ptid_t ptid
= r
->resume
[ndx
].thread
;
3099 if (ptid_equal (ptid
, minus_one_ptid
)
3100 || ptid_equal (ptid
, entry
->id
)
3101 || (ptid_is_pid (ptid
)
3102 && (ptid_get_pid (ptid
) == pid_of (lwp
)))
3103 || (ptid_get_lwp (ptid
) == -1
3104 && (ptid_get_pid (ptid
) == pid_of (lwp
))))
3106 if (r
->resume
[ndx
].kind
== resume_stop
3107 && thread
->last_resume_kind
== resume_stop
)
3110 fprintf (stderr
, "already %s LWP %ld at GDB's request\n",
3111 thread
->last_status
.kind
== TARGET_WAITKIND_STOPPED
3119 lwp
->resume
= &r
->resume
[ndx
];
3120 thread
->last_resume_kind
= lwp
->resume
->kind
;
3122 /* If we had a deferred signal to report, dequeue one now.
3123 This can happen if LWP gets more than one signal while
3124 trying to get out of a jump pad. */
3126 && !lwp
->status_pending_p
3127 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
3129 lwp
->status_pending_p
= 1;
3133 "Dequeueing deferred signal %d for LWP %ld, "
3134 "leaving status pending.\n",
3135 WSTOPSIG (lwp
->status_pending
), lwpid_of (lwp
));
3142 /* No resume action for this thread. */
3149 /* Set *FLAG_P if this lwp has an interesting status pending. */
3151 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
3153 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3155 /* LWPs which will not be resumed are not interesting, because
3156 we might not wait for them next time through linux_wait. */
3157 if (lwp
->resume
== NULL
)
3160 if (lwp
->status_pending_p
)
3161 * (int *) flag_p
= 1;
3166 /* Return 1 if this lwp that GDB wants running is stopped at an
3167 internal breakpoint that we need to step over. It assumes that any
3168 required STOP_PC adjustment has already been propagated to the
3169 inferior's regcache. */
3172 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
3174 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3175 struct thread_info
*thread
;
3176 struct thread_info
*saved_inferior
;
3179 /* LWPs which will not be resumed are not interesting, because we
3180 might not wait for them next time through linux_wait. */
3186 "Need step over [LWP %ld]? Ignoring, not stopped\n",
3191 thread
= get_lwp_thread (lwp
);
3193 if (thread
->last_resume_kind
== resume_stop
)
3197 "Need step over [LWP %ld]? Ignoring, should remain stopped\n",
3202 gdb_assert (lwp
->suspended
>= 0);
3208 "Need step over [LWP %ld]? Ignoring, suspended\n",
3213 if (!lwp
->need_step_over
)
3217 "Need step over [LWP %ld]? No\n", lwpid_of (lwp
));
3220 if (lwp
->status_pending_p
)
3224 "Need step over [LWP %ld]? Ignoring, has pending status.\n",
3229 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
3233 /* If the PC has changed since we stopped, then don't do anything,
3234 and let the breakpoint/tracepoint be hit. This happens if, for
3235 instance, GDB handled the decr_pc_after_break subtraction itself,
3236 GDB is OOL stepping this thread, or the user has issued a "jump"
3237 command, or poked thread's registers herself. */
3238 if (pc
!= lwp
->stop_pc
)
3242 "Need step over [LWP %ld]? Cancelling, PC was changed. "
3243 "Old stop_pc was 0x%s, PC is now 0x%s\n",
3244 lwpid_of (lwp
), paddress (lwp
->stop_pc
), paddress (pc
));
3246 lwp
->need_step_over
= 0;
3250 saved_inferior
= current_inferior
;
3251 current_inferior
= thread
;
3253 /* We can only step over breakpoints we know about. */
3254 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
3256 /* Don't step over a breakpoint that GDB expects to hit
3258 if (gdb_breakpoint_here (pc
))
3262 "Need step over [LWP %ld]? yes, but found"
3263 " GDB breakpoint at 0x%s; skipping step over\n",
3264 lwpid_of (lwp
), paddress (pc
));
3266 current_inferior
= saved_inferior
;
3273 "Need step over [LWP %ld]? yes, "
3274 "found breakpoint at 0x%s\n",
3275 lwpid_of (lwp
), paddress (pc
));
3277 /* We've found an lwp that needs stepping over --- return 1 so
3278 that find_inferior stops looking. */
3279 current_inferior
= saved_inferior
;
3281 /* If the step over is cancelled, this is set again. */
3282 lwp
->need_step_over
= 0;
3287 current_inferior
= saved_inferior
;
3291 "Need step over [LWP %ld]? No, no breakpoint found at 0x%s\n",
3292 lwpid_of (lwp
), paddress (pc
));
3297 /* Start a step-over operation on LWP. When LWP stopped at a
3298 breakpoint, to make progress, we need to remove the breakpoint out
3299 of the way. If we let other threads run while we do that, they may
3300 pass by the breakpoint location and miss hitting it. To avoid
3301 that, a step-over momentarily stops all threads while LWP is
3302 single-stepped while the breakpoint is temporarily uninserted from
3303 the inferior. When the single-step finishes, we reinsert the
3304 breakpoint, and let all threads that are supposed to be running,
3307 On targets that don't support hardware single-step, we don't
3308 currently support full software single-stepping. Instead, we only
3309 support stepping over the thread event breakpoint, by asking the
3310 low target where to place a reinsert breakpoint. Since this
3311 routine assumes the breakpoint being stepped over is a thread event
3312 breakpoint, it usually assumes the return address of the current
3313 function is a good enough place to set the reinsert breakpoint. */
3316 start_step_over (struct lwp_info
*lwp
)
3318 struct thread_info
*saved_inferior
;
3324 "Starting step-over on LWP %ld. Stopping all threads\n",
3327 stop_all_lwps (1, lwp
);
3328 gdb_assert (lwp
->suspended
== 0);
3331 fprintf (stderr
, "Done stopping all threads for step-over.\n");
3333 /* Note, we should always reach here with an already adjusted PC,
3334 either by GDB (if we're resuming due to GDB's request), or by our
3335 caller, if we just finished handling an internal breakpoint GDB
3336 shouldn't care about. */
3339 saved_inferior
= current_inferior
;
3340 current_inferior
= get_lwp_thread (lwp
);
3342 lwp
->bp_reinsert
= pc
;
3343 uninsert_breakpoints_at (pc
);
3344 uninsert_fast_tracepoint_jumps_at (pc
);
3346 if (can_hardware_single_step ())
3352 CORE_ADDR raddr
= (*the_low_target
.breakpoint_reinsert_addr
) ();
3353 set_reinsert_breakpoint (raddr
);
3357 current_inferior
= saved_inferior
;
3359 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
3361 /* Require next event from this LWP. */
3362 step_over_bkpt
= lwp
->head
.id
;
3366 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
3367 start_step_over, if still there, and delete any reinsert
3368 breakpoints we've set, on non hardware single-step targets. */
3371 finish_step_over (struct lwp_info
*lwp
)
3373 if (lwp
->bp_reinsert
!= 0)
3376 fprintf (stderr
, "Finished step over.\n");
3378 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
3379 may be no breakpoint to reinsert there by now. */
3380 reinsert_breakpoints_at (lwp
->bp_reinsert
);
3381 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
3383 lwp
->bp_reinsert
= 0;
3385 /* Delete any software-single-step reinsert breakpoints. No
3386 longer needed. We don't have to worry about other threads
3387 hitting this trap, and later not being able to explain it,
3388 because we were stepping over a breakpoint, and we hold all
3389 threads but LWP stopped while doing that. */
3390 if (!can_hardware_single_step ())
3391 delete_reinsert_breakpoints ();
3393 step_over_bkpt
= null_ptid
;
3400 /* This function is called once per thread. We check the thread's resume
3401 request, which will tell us whether to resume, step, or leave the thread
3402 stopped; and what signal, if any, it should be sent.
3404 For threads which we aren't explicitly told otherwise, we preserve
3405 the stepping flag; this is used for stepping over gdbserver-placed
3408 If pending_flags was set in any thread, we queue any needed
3409 signals, since we won't actually resume. We already have a pending
3410 event to report, so we don't need to preserve any step requests;
3411 they should be re-issued if necessary. */
3414 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
3416 struct lwp_info
*lwp
;
3417 struct thread_info
*thread
;
3419 int leave_all_stopped
= * (int *) arg
;
3422 thread
= (struct thread_info
*) entry
;
3423 lwp
= get_thread_lwp (thread
);
3425 if (lwp
->resume
== NULL
)
3428 if (lwp
->resume
->kind
== resume_stop
)
3431 fprintf (stderr
, "resume_stop request for LWP %ld\n", lwpid_of (lwp
));
3436 fprintf (stderr
, "stopping LWP %ld\n", lwpid_of (lwp
));
3438 /* Stop the thread, and wait for the event asynchronously,
3439 through the event loop. */
3445 fprintf (stderr
, "already stopped LWP %ld\n",
3448 /* The LWP may have been stopped in an internal event that
3449 was not meant to be notified back to GDB (e.g., gdbserver
3450 breakpoint), so we should be reporting a stop event in
3453 /* If the thread already has a pending SIGSTOP, this is a
3454 no-op. Otherwise, something later will presumably resume
3455 the thread and this will cause it to cancel any pending
3456 operation, due to last_resume_kind == resume_stop. If
3457 the thread already has a pending status to report, we
3458 will still report it the next time we wait - see
3459 status_pending_p_callback. */
3461 /* If we already have a pending signal to report, then
3462 there's no need to queue a SIGSTOP, as this means we're
3463 midway through moving the LWP out of the jumppad, and we
3464 will report the pending signal as soon as that is
3466 if (lwp
->pending_signals_to_report
== NULL
)
3470 /* For stop requests, we're done. */
3472 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3476 /* If this thread which is about to be resumed has a pending status,
3477 then don't resume any threads - we can just report the pending
3478 status. Make sure to queue any signals that would otherwise be
3479 sent. In all-stop mode, we do this decision based on if *any*
3480 thread has a pending status. If there's a thread that needs the
3481 step-over-breakpoint dance, then don't resume any other thread
3482 but that particular one. */
3483 leave_pending
= (lwp
->status_pending_p
|| leave_all_stopped
);
3488 fprintf (stderr
, "resuming LWP %ld\n", lwpid_of (lwp
));
3490 step
= (lwp
->resume
->kind
== resume_step
);
3491 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
3496 fprintf (stderr
, "leaving LWP %ld stopped\n", lwpid_of (lwp
));
3498 /* If we have a new signal, enqueue the signal. */
3499 if (lwp
->resume
->sig
!= 0)
3501 struct pending_signals
*p_sig
;
3502 p_sig
= xmalloc (sizeof (*p_sig
));
3503 p_sig
->prev
= lwp
->pending_signals
;
3504 p_sig
->signal
= lwp
->resume
->sig
;
3505 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3507 /* If this is the same signal we were previously stopped by,
3508 make sure to queue its siginfo. We can ignore the return
3509 value of ptrace; if it fails, we'll skip
3510 PTRACE_SETSIGINFO. */
3511 if (WIFSTOPPED (lwp
->last_status
)
3512 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
3513 ptrace (PTRACE_GETSIGINFO
, lwpid_of (lwp
), 0, &p_sig
->info
);
3515 lwp
->pending_signals
= p_sig
;
3519 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3525 linux_resume (struct thread_resume
*resume_info
, size_t n
)
3527 struct thread_resume_array array
= { resume_info
, n
};
3528 struct lwp_info
*need_step_over
= NULL
;
3530 int leave_all_stopped
;
3532 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
3534 /* If there is a thread which would otherwise be resumed, which has
3535 a pending status, then don't resume any threads - we can just
3536 report the pending status. Make sure to queue any signals that
3537 would otherwise be sent. In non-stop mode, we'll apply this
3538 logic to each thread individually. We consume all pending events
3539 before considering to start a step-over (in all-stop). */
3542 find_inferior (&all_lwps
, resume_status_pending_p
, &any_pending
);
3544 /* If there is a thread which would otherwise be resumed, which is
3545 stopped at a breakpoint that needs stepping over, then don't
3546 resume any threads - have it step over the breakpoint with all
3547 other threads stopped, then resume all threads again. Make sure
3548 to queue any signals that would otherwise be delivered or
3550 if (!any_pending
&& supports_breakpoints ())
3552 = (struct lwp_info
*) find_inferior (&all_lwps
,
3553 need_step_over_p
, NULL
);
3555 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
3559 if (need_step_over
!= NULL
)
3560 fprintf (stderr
, "Not resuming all, need step over\n");
3561 else if (any_pending
)
3563 "Not resuming, all-stop and found "
3564 "an LWP with pending status\n");
3566 fprintf (stderr
, "Resuming, no pending status or step over needed\n");
3569 /* Even if we're leaving threads stopped, queue all signals we'd
3570 otherwise deliver. */
3571 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
3574 start_step_over (need_step_over
);
3577 /* This function is called once per thread. We check the thread's
3578 last resume request, which will tell us whether to resume, step, or
3579 leave the thread stopped. Any signal the client requested to be
3580 delivered has already been enqueued at this point.
3582 If any thread that GDB wants running is stopped at an internal
3583 breakpoint that needs stepping over, we start a step-over operation
3584 on that particular thread, and leave all others stopped. */
3587 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
3589 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3590 struct thread_info
*thread
;
3598 "proceed_one_lwp: lwp %ld\n", lwpid_of (lwp
));
3603 fprintf (stderr
, " LWP %ld already running\n", lwpid_of (lwp
));
3607 thread
= get_lwp_thread (lwp
);
3609 if (thread
->last_resume_kind
== resume_stop
3610 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
3613 fprintf (stderr
, " client wants LWP to remain %ld stopped\n",
3618 if (lwp
->status_pending_p
)
3621 fprintf (stderr
, " LWP %ld has pending status, leaving stopped\n",
3626 gdb_assert (lwp
->suspended
>= 0);
3631 fprintf (stderr
, " LWP %ld is suspended\n", lwpid_of (lwp
));
3635 if (thread
->last_resume_kind
== resume_stop
3636 && lwp
->pending_signals_to_report
== NULL
3637 && lwp
->collecting_fast_tracepoint
== 0)
3639 /* We haven't reported this LWP as stopped yet (otherwise, the
3640 last_status.kind check above would catch it, and we wouldn't
3641 reach here. This LWP may have been momentarily paused by a
3642 stop_all_lwps call while handling for example, another LWP's
3643 step-over. In that case, the pending expected SIGSTOP signal
3644 that was queued at vCont;t handling time will have already
3645 been consumed by wait_for_sigstop, and so we need to requeue
3646 another one here. Note that if the LWP already has a SIGSTOP
3647 pending, this is a no-op. */
3651 "Client wants LWP %ld to stop. "
3652 "Making sure it has a SIGSTOP pending\n",
3658 step
= thread
->last_resume_kind
== resume_step
;
3659 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
3664 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
3666 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3672 gdb_assert (lwp
->suspended
>= 0);
3674 return proceed_one_lwp (entry
, except
);
3677 /* When we finish a step-over, set threads running again. If there's
3678 another thread that may need a step-over, now's the time to start
3679 it. Eventually, we'll move all threads past their breakpoints. */
3682 proceed_all_lwps (void)
3684 struct lwp_info
*need_step_over
;
3686 /* If there is a thread which would otherwise be resumed, which is
3687 stopped at a breakpoint that needs stepping over, then don't
3688 resume any threads - have it step over the breakpoint with all
3689 other threads stopped, then resume all threads again. */
3691 if (supports_breakpoints ())
3694 = (struct lwp_info
*) find_inferior (&all_lwps
,
3695 need_step_over_p
, NULL
);
3697 if (need_step_over
!= NULL
)
3700 fprintf (stderr
, "proceed_all_lwps: found "
3701 "thread %ld needing a step-over\n",
3702 lwpid_of (need_step_over
));
3704 start_step_over (need_step_over
);
3710 fprintf (stderr
, "Proceeding, no step-over needed\n");
3712 find_inferior (&all_lwps
, proceed_one_lwp
, NULL
);
3715 /* Stopped LWPs that the client wanted to be running, that don't have
3716 pending statuses, are set to run again, except for EXCEPT, if not
3717 NULL. This undoes a stop_all_lwps call. */
3720 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
3726 "unstopping all lwps, except=(LWP %ld)\n", lwpid_of (except
));
3729 "unstopping all lwps\n");
3733 find_inferior (&all_lwps
, unsuspend_and_proceed_one_lwp
, except
);
3735 find_inferior (&all_lwps
, proceed_one_lwp
, except
);
3738 #ifdef HAVE_LINUX_USRREGS
3741 register_addr (int regnum
)
3745 if (regnum
< 0 || regnum
>= the_low_target
.num_regs
)
3746 error ("Invalid register number %d.", regnum
);
3748 addr
= the_low_target
.regmap
[regnum
];
3753 /* Fetch one register. */
3755 fetch_register (struct regcache
*regcache
, int regno
)
3762 if (regno
>= the_low_target
.num_regs
)
3764 if ((*the_low_target
.cannot_fetch_register
) (regno
))
3767 regaddr
= register_addr (regno
);
3771 size
= ((register_size (regno
) + sizeof (PTRACE_XFER_TYPE
) - 1)
3772 & -sizeof (PTRACE_XFER_TYPE
));
3773 buf
= alloca (size
);
3775 pid
= lwpid_of (get_thread_lwp (current_inferior
));
3776 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
3779 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
3780 ptrace (PTRACE_PEEKUSER
, pid
,
3781 /* Coerce to a uintptr_t first to avoid potential gcc warning
3782 of coercing an 8 byte integer to a 4 byte pointer. */
3783 (PTRACE_ARG3_TYPE
) (uintptr_t) regaddr
, 0);
3784 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
3786 error ("reading register %d: %s", regno
, strerror (errno
));
3789 if (the_low_target
.supply_ptrace_register
)
3790 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
3792 supply_register (regcache
, regno
, buf
);
3795 /* Store one register. */
3797 store_register (struct regcache
*regcache
, int regno
)
3804 if (regno
>= the_low_target
.num_regs
)
3806 if ((*the_low_target
.cannot_store_register
) (regno
))
3809 regaddr
= register_addr (regno
);
3813 size
= ((register_size (regno
) + sizeof (PTRACE_XFER_TYPE
) - 1)
3814 & -sizeof (PTRACE_XFER_TYPE
));
3815 buf
= alloca (size
);
3816 memset (buf
, 0, size
);
3818 if (the_low_target
.collect_ptrace_register
)
3819 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
3821 collect_register (regcache
, regno
, buf
);
3823 pid
= lwpid_of (get_thread_lwp (current_inferior
));
3824 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
3827 ptrace (PTRACE_POKEUSER
, pid
,
3828 /* Coerce to a uintptr_t first to avoid potential gcc warning
3829 about coercing an 8 byte integer to a 4 byte pointer. */
3830 (PTRACE_ARG3_TYPE
) (uintptr_t) regaddr
,
3831 (PTRACE_ARG4_TYPE
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
3834 /* At this point, ESRCH should mean the process is
3835 already gone, in which case we simply ignore attempts
3836 to change its registers. See also the related
3837 comment in linux_resume_one_lwp. */
3841 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
3842 error ("writing register %d: %s", regno
, strerror (errno
));
3844 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
3848 /* Fetch all registers, or just one, from the child process. */
3850 usr_fetch_inferior_registers (struct regcache
*regcache
, int regno
)
3853 for (regno
= 0; regno
< the_low_target
.num_regs
; regno
++)
3854 fetch_register (regcache
, regno
);
3856 fetch_register (regcache
, regno
);
3859 /* Store our register values back into the inferior.
3860 If REGNO is -1, do this for all registers.
3861 Otherwise, REGNO specifies which register (so we can save time). */
3863 usr_store_inferior_registers (struct regcache
*regcache
, int regno
)
3866 for (regno
= 0; regno
< the_low_target
.num_regs
; regno
++)
3867 store_register (regcache
, regno
);
3869 store_register (regcache
, regno
);
3871 #endif /* HAVE_LINUX_USRREGS */
3875 #ifdef HAVE_LINUX_REGSETS
3878 regsets_fetch_inferior_registers (struct regcache
*regcache
)
3880 struct regset_info
*regset
;
3881 int saw_general_regs
= 0;
3885 regset
= target_regsets
;
3887 pid
= lwpid_of (get_thread_lwp (current_inferior
));
3888 while (regset
->size
>= 0)
3893 if (regset
->size
== 0 || disabled_regsets
[regset
- target_regsets
])
3899 buf
= xmalloc (regset
->size
);
3901 nt_type
= regset
->nt_type
;
3905 iov
.iov_len
= regset
->size
;
3906 data
= (void *) &iov
;
3912 res
= ptrace (regset
->get_request
, pid
, nt_type
, data
);
3914 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
3920 /* If we get EIO on a regset, do not try it again for
3922 disabled_regsets
[regset
- target_regsets
] = 1;
3929 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
3934 else if (regset
->type
== GENERAL_REGS
)
3935 saw_general_regs
= 1;
3936 regset
->store_function (regcache
, buf
);
3940 if (saw_general_regs
)
3947 regsets_store_inferior_registers (struct regcache
*regcache
)
3949 struct regset_info
*regset
;
3950 int saw_general_regs
= 0;
3954 regset
= target_regsets
;
3956 pid
= lwpid_of (get_thread_lwp (current_inferior
));
3957 while (regset
->size
>= 0)
3962 if (regset
->size
== 0 || disabled_regsets
[regset
- target_regsets
])
3968 buf
= xmalloc (regset
->size
);
3970 /* First fill the buffer with the current register set contents,
3971 in case there are any items in the kernel's regset that are
3972 not in gdbserver's regcache. */
3974 nt_type
= regset
->nt_type
;
3978 iov
.iov_len
= regset
->size
;
3979 data
= (void *) &iov
;
3985 res
= ptrace (regset
->get_request
, pid
, nt_type
, data
);
3987 res
= ptrace (regset
->get_request
, pid
, &iov
, data
);
3992 /* Then overlay our cached registers on that. */
3993 regset
->fill_function (regcache
, buf
);
3995 /* Only now do we write the register set. */
3997 res
= ptrace (regset
->set_request
, pid
, nt_type
, data
);
3999 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
4007 /* If we get EIO on a regset, do not try it again for
4009 disabled_regsets
[regset
- target_regsets
] = 1;
4013 else if (errno
== ESRCH
)
4015 /* At this point, ESRCH should mean the process is
4016 already gone, in which case we simply ignore attempts
4017 to change its registers. See also the related
4018 comment in linux_resume_one_lwp. */
4024 perror ("Warning: ptrace(regsets_store_inferior_registers)");
4027 else if (regset
->type
== GENERAL_REGS
)
4028 saw_general_regs
= 1;
4032 if (saw_general_regs
)
4039 #endif /* HAVE_LINUX_REGSETS */
4043 linux_fetch_registers (struct regcache
*regcache
, int regno
)
4045 #ifdef HAVE_LINUX_REGSETS
4046 if (regsets_fetch_inferior_registers (regcache
) == 0)
4049 #ifdef HAVE_LINUX_USRREGS
4050 usr_fetch_inferior_registers (regcache
, regno
);
4055 linux_store_registers (struct regcache
*regcache
, int regno
)
4057 #ifdef HAVE_LINUX_REGSETS
4058 if (regsets_store_inferior_registers (regcache
) == 0)
4061 #ifdef HAVE_LINUX_USRREGS
4062 usr_store_inferior_registers (regcache
, regno
);
4067 /* Copy LEN bytes from inferior's memory starting at MEMADDR
4068 to debugger memory starting at MYADDR. */
4071 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
4074 /* Round starting address down to longword boundary. */
4075 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4076 /* Round ending address up; get number of longwords that makes. */
4078 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4079 / sizeof (PTRACE_XFER_TYPE
);
4080 /* Allocate buffer of that many longwords. */
4081 register PTRACE_XFER_TYPE
*buffer
4082 = (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4085 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4087 /* Try using /proc. Don't bother for one word. */
4088 if (len
>= 3 * sizeof (long))
4090 /* We could keep this file open and cache it - possibly one per
4091 thread. That requires some juggling, but is even faster. */
4092 sprintf (filename
, "/proc/%d/mem", pid
);
4093 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4097 /* If pread64 is available, use it. It's faster if the kernel
4098 supports it (only one syscall), and it's 64-bit safe even on
4099 32-bit platforms (for instance, SPARC debugging a SPARC64
4102 if (pread64 (fd
, myaddr
, len
, memaddr
) != len
)
4104 if (lseek (fd
, memaddr
, SEEK_SET
) == -1 || read (fd
, myaddr
, len
) != len
)
4116 /* Read all the longwords */
4117 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4120 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4121 about coercing an 8 byte integer to a 4 byte pointer. */
4122 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
4123 (PTRACE_ARG3_TYPE
) (uintptr_t) addr
, 0);
4128 /* Copy appropriate bytes out of the buffer. */
4130 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4136 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
4137 memory at MEMADDR. On failure (cannot write to the inferior)
4138 returns the value of errno. */
4141 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
4144 /* Round starting address down to longword boundary. */
4145 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4146 /* Round ending address up; get number of longwords that makes. */
4148 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4149 / sizeof (PTRACE_XFER_TYPE
);
4151 /* Allocate buffer of that many longwords. */
4152 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*)
4153 alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4155 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4159 /* Dump up to four bytes. */
4160 unsigned int val
= * (unsigned int *) myaddr
;
4166 val
= val
& 0xffffff;
4167 fprintf (stderr
, "Writing %0*x to 0x%08lx\n", 2 * ((len
< 4) ? len
: 4),
4168 val
, (long)memaddr
);
4171 /* Fill start and end extra bytes of buffer with existing memory data. */
4174 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4175 about coercing an 8 byte integer to a 4 byte pointer. */
4176 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
4177 (PTRACE_ARG3_TYPE
) (uintptr_t) addr
, 0);
4185 = ptrace (PTRACE_PEEKTEXT
, pid
,
4186 /* Coerce to a uintptr_t first to avoid potential gcc warning
4187 about coercing an 8 byte integer to a 4 byte pointer. */
4188 (PTRACE_ARG3_TYPE
) (uintptr_t) (addr
+ (count
- 1)
4189 * sizeof (PTRACE_XFER_TYPE
)),
4195 /* Copy data to be written over corresponding part of buffer. */
4197 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4200 /* Write the entire buffer. */
4202 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4205 ptrace (PTRACE_POKETEXT
, pid
,
4206 /* Coerce to a uintptr_t first to avoid potential gcc warning
4207 about coercing an 8 byte integer to a 4 byte pointer. */
4208 (PTRACE_ARG3_TYPE
) (uintptr_t) addr
,
4209 (PTRACE_ARG4_TYPE
) buffer
[i
]);
4217 /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */
4218 static int linux_supports_tracefork_flag
;
4221 linux_enable_event_reporting (int pid
)
4223 if (!linux_supports_tracefork_flag
)
4226 ptrace (PTRACE_SETOPTIONS
, pid
, 0, (PTRACE_ARG4_TYPE
) PTRACE_O_TRACECLONE
);
4229 /* Helper functions for linux_test_for_tracefork, called via clone (). */
4232 linux_tracefork_grandchild (void *arg
)
4237 #define STACK_SIZE 4096
4240 linux_tracefork_child (void *arg
)
4242 ptrace (PTRACE_TRACEME
, 0, 0, 0);
4243 kill (getpid (), SIGSTOP
);
4245 #if !(defined(__UCLIBC__) && defined(HAS_NOMMU))
4248 linux_tracefork_grandchild (NULL
);
4250 #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4253 __clone2 (linux_tracefork_grandchild
, arg
, STACK_SIZE
,
4254 CLONE_VM
| SIGCHLD
, NULL
);
4256 clone (linux_tracefork_grandchild
, (char *) arg
+ STACK_SIZE
,
4257 CLONE_VM
| SIGCHLD
, NULL
);
4260 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4265 /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make
4266 sure that we can enable the option, and that it had the desired
4270 linux_test_for_tracefork (void)
4272 int child_pid
, ret
, status
;
4274 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
4275 char *stack
= xmalloc (STACK_SIZE
* 4);
4276 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4278 linux_supports_tracefork_flag
= 0;
4280 #if !(defined(__UCLIBC__) && defined(HAS_NOMMU))
4282 child_pid
= fork ();
4284 linux_tracefork_child (NULL
);
4286 #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4288 /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */
4290 child_pid
= __clone2 (linux_tracefork_child
, stack
, STACK_SIZE
,
4291 CLONE_VM
| SIGCHLD
, stack
+ STACK_SIZE
* 2);
4292 #else /* !__ia64__ */
4293 child_pid
= clone (linux_tracefork_child
, stack
+ STACK_SIZE
,
4294 CLONE_VM
| SIGCHLD
, stack
+ STACK_SIZE
* 2);
4295 #endif /* !__ia64__ */
4297 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4299 if (child_pid
== -1)
4300 perror_with_name ("clone");
4302 ret
= my_waitpid (child_pid
, &status
, 0);
4304 perror_with_name ("waitpid");
4305 else if (ret
!= child_pid
)
4306 error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret
);
4307 if (! WIFSTOPPED (status
))
4308 error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status
);
4310 ret
= ptrace (PTRACE_SETOPTIONS
, child_pid
, 0,
4311 (PTRACE_ARG4_TYPE
) PTRACE_O_TRACEFORK
);
4314 ret
= ptrace (PTRACE_KILL
, child_pid
, 0, 0);
4317 warning ("linux_test_for_tracefork: failed to kill child");
4321 ret
= my_waitpid (child_pid
, &status
, 0);
4322 if (ret
!= child_pid
)
4323 warning ("linux_test_for_tracefork: failed to wait for killed child");
4324 else if (!WIFSIGNALED (status
))
4325 warning ("linux_test_for_tracefork: unexpected wait status 0x%x from "
4326 "killed child", status
);
4331 ret
= ptrace (PTRACE_CONT
, child_pid
, 0, 0);
4333 warning ("linux_test_for_tracefork: failed to resume child");
4335 ret
= my_waitpid (child_pid
, &status
, 0);
4337 if (ret
== child_pid
&& WIFSTOPPED (status
)
4338 && status
>> 16 == PTRACE_EVENT_FORK
)
4341 ret
= ptrace (PTRACE_GETEVENTMSG
, child_pid
, 0, &second_pid
);
4342 if (ret
== 0 && second_pid
!= 0)
4346 linux_supports_tracefork_flag
= 1;
4347 my_waitpid (second_pid
, &second_status
, 0);
4348 ret
= ptrace (PTRACE_KILL
, second_pid
, 0, 0);
4350 warning ("linux_test_for_tracefork: failed to kill second child");
4351 my_waitpid (second_pid
, &status
, 0);
4355 warning ("linux_test_for_tracefork: unexpected result from waitpid "
4356 "(%d, status 0x%x)", ret
, status
);
4360 ret
= ptrace (PTRACE_KILL
, child_pid
, 0, 0);
4362 warning ("linux_test_for_tracefork: failed to kill child");
4363 my_waitpid (child_pid
, &status
, 0);
4365 while (WIFSTOPPED (status
));
4367 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
4369 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4374 linux_look_up_symbols (void)
4376 #ifdef USE_THREAD_DB
4377 struct process_info
*proc
= current_process ();
4379 if (proc
->private->thread_db
!= NULL
)
4382 /* If the kernel supports tracing forks then it also supports tracing
4383 clones, and then we don't need to use the magic thread event breakpoint
4384 to learn about threads. */
4385 thread_db_init (!linux_supports_tracefork_flag
);
4390 linux_request_interrupt (void)
4392 extern unsigned long signal_pid
;
4394 if (!ptid_equal (cont_thread
, null_ptid
)
4395 && !ptid_equal (cont_thread
, minus_one_ptid
))
4397 struct lwp_info
*lwp
;
4400 lwp
= get_thread_lwp (current_inferior
);
4401 lwpid
= lwpid_of (lwp
);
4402 kill_lwp (lwpid
, SIGINT
);
4405 kill_lwp (signal_pid
, SIGINT
);
4408 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
4409 to debugger memory starting at MYADDR. */
4412 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
4414 char filename
[PATH_MAX
];
4416 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4418 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
4420 fd
= open (filename
, O_RDONLY
);
4424 if (offset
!= (CORE_ADDR
) 0
4425 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4428 n
= read (fd
, myaddr
, len
);
4435 /* These breakpoint and watchpoint related wrapper functions simply
4436 pass on the function call if the target has registered a
4437 corresponding function. */
4440 linux_insert_point (char type
, CORE_ADDR addr
, int len
)
4442 if (the_low_target
.insert_point
!= NULL
)
4443 return the_low_target
.insert_point (type
, addr
, len
);
4445 /* Unsupported (see target.h). */
4450 linux_remove_point (char type
, CORE_ADDR addr
, int len
)
4452 if (the_low_target
.remove_point
!= NULL
)
4453 return the_low_target
.remove_point (type
, addr
, len
);
4455 /* Unsupported (see target.h). */
4460 linux_stopped_by_watchpoint (void)
4462 struct lwp_info
*lwp
= get_thread_lwp (current_inferior
);
4464 return lwp
->stopped_by_watchpoint
;
4468 linux_stopped_data_address (void)
4470 struct lwp_info
*lwp
= get_thread_lwp (current_inferior
);
4472 return lwp
->stopped_data_address
;
4475 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
4476 #if defined(__mcoldfire__)
4477 /* These should really be defined in the kernel's ptrace.h header. */
4478 #define PT_TEXT_ADDR 49*4
4479 #define PT_DATA_ADDR 50*4
4480 #define PT_TEXT_END_ADDR 51*4
4482 #define PT_TEXT_ADDR 220
4483 #define PT_TEXT_END_ADDR 224
4484 #define PT_DATA_ADDR 228
4485 #elif defined(__TMS320C6X__)
4486 #define PT_TEXT_ADDR (0x10000*4)
4487 #define PT_DATA_ADDR (0x10004*4)
4488 #define PT_TEXT_END_ADDR (0x10008*4)
4491 /* Under uClinux, programs are loaded at non-zero offsets, which we need
4492 to tell gdb about. */
4495 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
4497 #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR)
4498 unsigned long text
, text_end
, data
;
4499 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4503 text
= ptrace (PTRACE_PEEKUSER
, pid
, (long)PT_TEXT_ADDR
, 0);
4504 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (long)PT_TEXT_END_ADDR
, 0);
4505 data
= ptrace (PTRACE_PEEKUSER
, pid
, (long)PT_DATA_ADDR
, 0);
4509 /* Both text and data offsets produced at compile-time (and so
4510 used by gdb) are relative to the beginning of the program,
4511 with the data segment immediately following the text segment.
4512 However, the actual runtime layout in memory may put the data
4513 somewhere else, so when we send gdb a data base-address, we
4514 use the real data base address and subtract the compile-time
4515 data base-address from it (which is just the length of the
4516 text segment). BSS immediately follows data in both
4519 *data_p
= data
- (text_end
- text
);
4529 linux_qxfer_osdata (const char *annex
,
4530 unsigned char *readbuf
, unsigned const char *writebuf
,
4531 CORE_ADDR offset
, int len
)
4533 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
4536 /* Convert a native/host siginfo object, into/from the siginfo in the
4537 layout of the inferiors' architecture. */
4540 siginfo_fixup (struct siginfo
*siginfo
, void *inf_siginfo
, int direction
)
4544 if (the_low_target
.siginfo_fixup
!= NULL
)
4545 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
4547 /* If there was no callback, or the callback didn't do anything,
4548 then just do a straight memcpy. */
4552 memcpy (siginfo
, inf_siginfo
, sizeof (struct siginfo
));
4554 memcpy (inf_siginfo
, siginfo
, sizeof (struct siginfo
));
4559 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
4560 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
4563 struct siginfo siginfo
;
4564 char inf_siginfo
[sizeof (struct siginfo
)];
4566 if (current_inferior
== NULL
)
4569 pid
= lwpid_of (get_thread_lwp (current_inferior
));
4572 fprintf (stderr
, "%s siginfo for lwp %d.\n",
4573 readbuf
!= NULL
? "Reading" : "Writing",
4576 if (offset
>= sizeof (siginfo
))
4579 if (ptrace (PTRACE_GETSIGINFO
, pid
, 0, &siginfo
) != 0)
4582 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
4583 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
4584 inferior with a 64-bit GDBSERVER should look the same as debugging it
4585 with a 32-bit GDBSERVER, we need to convert it. */
4586 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
4588 if (offset
+ len
> sizeof (siginfo
))
4589 len
= sizeof (siginfo
) - offset
;
4591 if (readbuf
!= NULL
)
4592 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
4595 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
4597 /* Convert back to ptrace layout before flushing it out. */
4598 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
4600 if (ptrace (PTRACE_SETSIGINFO
, pid
, 0, &siginfo
) != 0)
4607 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
4608 so we notice when children change state; as the handler for the
4609 sigsuspend in my_waitpid. */
4612 sigchld_handler (int signo
)
4614 int old_errno
= errno
;
4620 /* fprintf is not async-signal-safe, so call write
4622 if (write (2, "sigchld_handler\n",
4623 sizeof ("sigchld_handler\n") - 1) < 0)
4624 break; /* just ignore */
4628 if (target_is_async_p ())
4629 async_file_mark (); /* trigger a linux_wait */
4635 linux_supports_non_stop (void)
4641 linux_async (int enable
)
4643 int previous
= (linux_event_pipe
[0] != -1);
4646 fprintf (stderr
, "linux_async (%d), previous=%d\n",
4649 if (previous
!= enable
)
4652 sigemptyset (&mask
);
4653 sigaddset (&mask
, SIGCHLD
);
4655 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
4659 if (pipe (linux_event_pipe
) == -1)
4660 fatal ("creating event pipe failed.");
4662 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
4663 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
4665 /* Register the event loop handler. */
4666 add_file_handler (linux_event_pipe
[0],
4667 handle_target_event
, NULL
);
4669 /* Always trigger a linux_wait. */
4674 delete_file_handler (linux_event_pipe
[0]);
4676 close (linux_event_pipe
[0]);
4677 close (linux_event_pipe
[1]);
4678 linux_event_pipe
[0] = -1;
4679 linux_event_pipe
[1] = -1;
4682 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
4689 linux_start_non_stop (int nonstop
)
4691 /* Register or unregister from event-loop accordingly. */
4692 linux_async (nonstop
);
4697 linux_supports_multi_process (void)
4703 linux_supports_disable_randomization (void)
4705 #ifdef HAVE_PERSONALITY
4712 /* Enumerate spufs IDs for process PID. */
4714 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
4720 struct dirent
*entry
;
4722 sprintf (path
, "/proc/%ld/fd", pid
);
4723 dir
= opendir (path
);
4728 while ((entry
= readdir (dir
)) != NULL
)
4734 fd
= atoi (entry
->d_name
);
4738 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
4739 if (stat (path
, &st
) != 0)
4741 if (!S_ISDIR (st
.st_mode
))
4744 if (statfs (path
, &stfs
) != 0)
4746 if (stfs
.f_type
!= SPUFS_MAGIC
)
4749 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
4751 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
4761 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
4762 object type, using the /proc file system. */
4764 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
4765 unsigned const char *writebuf
,
4766 CORE_ADDR offset
, int len
)
4768 long pid
= lwpid_of (get_thread_lwp (current_inferior
));
4773 if (!writebuf
&& !readbuf
)
4781 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
4784 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
4785 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
4790 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4797 ret
= write (fd
, writebuf
, (size_t) len
);
4799 ret
= read (fd
, readbuf
, (size_t) len
);
4805 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
4806 struct target_loadseg
4808 /* Core address to which the segment is mapped. */
4810 /* VMA recorded in the program header. */
4812 /* Size of this segment in memory. */
4816 # if defined PT_GETDSBT
4817 struct target_loadmap
4819 /* Protocol version number, must be zero. */
4821 /* Pointer to the DSBT table, its size, and the DSBT index. */
4822 unsigned *dsbt_table
;
4823 unsigned dsbt_size
, dsbt_index
;
4824 /* Number of segments in this map. */
4826 /* The actual memory map. */
4827 struct target_loadseg segs
[/*nsegs*/];
4829 # define LINUX_LOADMAP PT_GETDSBT
4830 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
4831 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
4833 struct target_loadmap
4835 /* Protocol version number, must be zero. */
4837 /* Number of segments in this map. */
4839 /* The actual memory map. */
4840 struct target_loadseg segs
[/*nsegs*/];
4842 # define LINUX_LOADMAP PTRACE_GETFDPIC
4843 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
4844 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
4848 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
4849 unsigned char *myaddr
, unsigned int len
)
4851 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4853 struct target_loadmap
*data
= NULL
;
4854 unsigned int actual_length
, copy_length
;
4856 if (strcmp (annex
, "exec") == 0)
4857 addr
= (int) LINUX_LOADMAP_EXEC
;
4858 else if (strcmp (annex
, "interp") == 0)
4859 addr
= (int) LINUX_LOADMAP_INTERP
;
4863 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
4869 actual_length
= sizeof (struct target_loadmap
)
4870 + sizeof (struct target_loadseg
) * data
->nsegs
;
4872 if (offset
< 0 || offset
> actual_length
)
4875 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
4876 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
4880 # define linux_read_loadmap NULL
4881 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
4884 linux_process_qsupported (const char *query
)
4886 if (the_low_target
.process_qsupported
!= NULL
)
4887 the_low_target
.process_qsupported (query
);
4891 linux_supports_tracepoints (void)
4893 if (*the_low_target
.supports_tracepoints
== NULL
)
4896 return (*the_low_target
.supports_tracepoints
) ();
4900 linux_read_pc (struct regcache
*regcache
)
4902 if (the_low_target
.get_pc
== NULL
)
4905 return (*the_low_target
.get_pc
) (regcache
);
4909 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
4911 gdb_assert (the_low_target
.set_pc
!= NULL
);
4913 (*the_low_target
.set_pc
) (regcache
, pc
);
4917 linux_thread_stopped (struct thread_info
*thread
)
4919 return get_thread_lwp (thread
)->stopped
;
4922 /* This exposes stop-all-threads functionality to other modules. */
4925 linux_pause_all (int freeze
)
4927 stop_all_lwps (freeze
, NULL
);
4930 /* This exposes unstop-all-threads functionality to other gdbserver
4934 linux_unpause_all (int unfreeze
)
4936 unstop_all_lwps (unfreeze
, NULL
);
4940 linux_prepare_to_access_memory (void)
4942 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
4945 linux_pause_all (1);
4950 linux_done_accessing_memory (void)
4952 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
4955 linux_unpause_all (1);
4959 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
4960 CORE_ADDR collector
,
4963 CORE_ADDR
*jump_entry
,
4964 CORE_ADDR
*trampoline
,
4965 ULONGEST
*trampoline_size
,
4966 unsigned char *jjump_pad_insn
,
4967 ULONGEST
*jjump_pad_insn_size
,
4968 CORE_ADDR
*adjusted_insn_addr
,
4969 CORE_ADDR
*adjusted_insn_addr_end
,
4972 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
4973 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
4974 jump_entry
, trampoline
, trampoline_size
,
4975 jjump_pad_insn
, jjump_pad_insn_size
,
4976 adjusted_insn_addr
, adjusted_insn_addr_end
,
4980 static struct emit_ops
*
4981 linux_emit_ops (void)
4983 if (the_low_target
.emit_ops
!= NULL
)
4984 return (*the_low_target
.emit_ops
) ();
4990 linux_get_min_fast_tracepoint_insn_len (void)
4992 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
4995 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
4998 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
4999 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
5001 char filename
[PATH_MAX
];
5003 const int auxv_size
= is_elf64
5004 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
5005 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
5007 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5009 fd
= open (filename
, O_RDONLY
);
5015 while (read (fd
, buf
, auxv_size
) == auxv_size
5016 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
5020 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
5022 switch (aux
->a_type
)
5025 *phdr_memaddr
= aux
->a_un
.a_val
;
5028 *num_phdr
= aux
->a_un
.a_val
;
5034 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
5036 switch (aux
->a_type
)
5039 *phdr_memaddr
= aux
->a_un
.a_val
;
5042 *num_phdr
= aux
->a_un
.a_val
;
5050 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
5052 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
5053 "phdr_memaddr = %ld, phdr_num = %d",
5054 (long) *phdr_memaddr
, *num_phdr
);
5061 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
5064 get_dynamic (const int pid
, const int is_elf64
)
5066 CORE_ADDR phdr_memaddr
, relocation
;
5068 unsigned char *phdr_buf
;
5069 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
5071 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
5074 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
5075 phdr_buf
= alloca (num_phdr
* phdr_size
);
5077 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
5080 /* Compute relocation: it is expected to be 0 for "regular" executables,
5081 non-zero for PIE ones. */
5083 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
5086 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5088 if (p
->p_type
== PT_PHDR
)
5089 relocation
= phdr_memaddr
- p
->p_vaddr
;
5093 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5095 if (p
->p_type
== PT_PHDR
)
5096 relocation
= phdr_memaddr
- p
->p_vaddr
;
5099 if (relocation
== -1)
5101 warning ("Unexpected missing PT_PHDR");
5105 for (i
= 0; i
< num_phdr
; i
++)
5109 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5111 if (p
->p_type
== PT_DYNAMIC
)
5112 return p
->p_vaddr
+ relocation
;
5116 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5118 if (p
->p_type
== PT_DYNAMIC
)
5119 return p
->p_vaddr
+ relocation
;
5126 /* Return &_r_debug in the inferior, or -1 if not present. Return value
5127 can be 0 if the inferior does not yet have the library list initialized. */
5130 get_r_debug (const int pid
, const int is_elf64
)
5132 CORE_ADDR dynamic_memaddr
;
5133 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
5134 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
5136 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
5137 if (dynamic_memaddr
== 0)
5138 return (CORE_ADDR
) -1;
5140 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
5144 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
5146 if (dyn
->d_tag
== DT_DEBUG
)
5147 return dyn
->d_un
.d_val
;
5149 if (dyn
->d_tag
== DT_NULL
)
5154 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
5156 if (dyn
->d_tag
== DT_DEBUG
)
5157 return dyn
->d_un
.d_val
;
5159 if (dyn
->d_tag
== DT_NULL
)
5163 dynamic_memaddr
+= dyn_size
;
5166 return (CORE_ADDR
) -1;
5169 /* Read one pointer from MEMADDR in the inferior. */
5172 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
5175 return linux_read_memory (memaddr
, (unsigned char *) ptr
, ptr_size
);
5178 struct link_map_offsets
5180 /* Offset and size of r_debug.r_version. */
5181 int r_version_offset
;
5183 /* Offset and size of r_debug.r_map. */
5186 /* Offset to l_addr field in struct link_map. */
5189 /* Offset to l_name field in struct link_map. */
5192 /* Offset to l_ld field in struct link_map. */
5195 /* Offset to l_next field in struct link_map. */
5198 /* Offset to l_prev field in struct link_map. */
5202 /* Construct qXfer:libraries:read reply. */
5205 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
5206 unsigned const char *writebuf
,
5207 CORE_ADDR offset
, int len
)
5210 unsigned document_len
;
5211 struct process_info_private
*const priv
= current_process ()->private;
5212 char filename
[PATH_MAX
];
5215 static const struct link_map_offsets lmo_32bit_offsets
=
5217 0, /* r_version offset. */
5218 4, /* r_debug.r_map offset. */
5219 0, /* l_addr offset in link_map. */
5220 4, /* l_name offset in link_map. */
5221 8, /* l_ld offset in link_map. */
5222 12, /* l_next offset in link_map. */
5223 16 /* l_prev offset in link_map. */
5226 static const struct link_map_offsets lmo_64bit_offsets
=
5228 0, /* r_version offset. */
5229 8, /* r_debug.r_map offset. */
5230 0, /* l_addr offset in link_map. */
5231 8, /* l_name offset in link_map. */
5232 16, /* l_ld offset in link_map. */
5233 24, /* l_next offset in link_map. */
5234 32 /* l_prev offset in link_map. */
5236 const struct link_map_offsets
*lmo
;
5238 if (writebuf
!= NULL
)
5240 if (readbuf
== NULL
)
5243 pid
= lwpid_of (get_thread_lwp (current_inferior
));
5244 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
5245 is_elf64
= elf_64_file_p (filename
);
5246 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
5248 if (priv
->r_debug
== 0)
5249 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
5251 if (priv
->r_debug
== (CORE_ADDR
) -1 || priv
->r_debug
== 0)
5253 document
= xstrdup ("<library-list-svr4 version=\"1.0\"/>\n");
5257 int allocated
= 1024;
5259 const int ptr_size
= is_elf64
? 8 : 4;
5260 CORE_ADDR lm_addr
, lm_prev
, l_name
, l_addr
, l_ld
, l_next
, l_prev
;
5261 int r_version
, header_done
= 0;
5263 document
= xmalloc (allocated
);
5264 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
5265 p
= document
+ strlen (document
);
5268 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
5269 (unsigned char *) &r_version
,
5270 sizeof (r_version
)) != 0
5273 warning ("unexpected r_debug version %d", r_version
);
5277 if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
5278 &lm_addr
, ptr_size
) != 0)
5280 warning ("unable to read r_map from 0x%lx",
5281 (long) priv
->r_debug
+ lmo
->r_map_offset
);
5286 while (read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
5287 &l_name
, ptr_size
) == 0
5288 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
5289 &l_addr
, ptr_size
) == 0
5290 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
5291 &l_ld
, ptr_size
) == 0
5292 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
5293 &l_prev
, ptr_size
) == 0
5294 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
5295 &l_next
, ptr_size
) == 0)
5297 unsigned char libname
[PATH_MAX
];
5299 if (lm_prev
!= l_prev
)
5301 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
5302 (long) lm_prev
, (long) l_prev
);
5306 /* Not checking for error because reading may stop before
5307 we've got PATH_MAX worth of characters. */
5309 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
5310 libname
[sizeof (libname
) - 1] = '\0';
5311 if (libname
[0] != '\0')
5313 /* 6x the size for xml_escape_text below. */
5314 size_t len
= 6 * strlen ((char *) libname
);
5319 /* Terminate `<library-list-svr4'. */
5324 while (allocated
< p
- document
+ len
+ 200)
5326 /* Expand to guarantee sufficient storage. */
5327 uintptr_t document_len
= p
- document
;
5329 document
= xrealloc (document
, 2 * allocated
);
5331 p
= document
+ document_len
;
5334 name
= xml_escape_text ((char *) libname
);
5335 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
5336 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
5337 name
, (unsigned long) lm_addr
,
5338 (unsigned long) l_addr
, (unsigned long) l_ld
);
5341 else if (lm_prev
== 0)
5343 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
5354 strcpy (p
, "</library-list-svr4>");
5357 document_len
= strlen (document
);
5358 if (offset
< document_len
)
5359 document_len
-= offset
;
5362 if (len
> document_len
)
5365 memcpy (readbuf
, document
+ offset
, len
);
5371 static struct target_ops linux_target_ops
= {
5372 linux_create_inferior
,
5381 linux_fetch_registers
,
5382 linux_store_registers
,
5383 linux_prepare_to_access_memory
,
5384 linux_done_accessing_memory
,
5387 linux_look_up_symbols
,
5388 linux_request_interrupt
,
5392 linux_stopped_by_watchpoint
,
5393 linux_stopped_data_address
,
5394 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
5399 #ifdef USE_THREAD_DB
5400 thread_db_get_tls_address
,
5405 hostio_last_error_from_errno
,
5408 linux_supports_non_stop
,
5410 linux_start_non_stop
,
5411 linux_supports_multi_process
,
5412 #ifdef USE_THREAD_DB
5413 thread_db_handle_monitor_command
,
5417 linux_common_core_of_thread
,
5419 linux_process_qsupported
,
5420 linux_supports_tracepoints
,
5423 linux_thread_stopped
,
5427 linux_cancel_breakpoints
,
5428 linux_stabilize_threads
,
5429 linux_install_fast_tracepoint_jump_pad
,
5431 linux_supports_disable_randomization
,
5432 linux_get_min_fast_tracepoint_insn_len
,
5433 linux_qxfer_libraries_svr4
,
5437 linux_init_signals ()
5439 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
5440 to find what the cancel signal actually is. */
5441 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
5442 signal (__SIGRTMIN
+1, SIG_IGN
);
5447 initialize_low (void)
5449 struct sigaction sigchld_action
;
5450 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
5451 set_target_ops (&linux_target_ops
);
5452 set_breakpoint_data (the_low_target
.breakpoint
,
5453 the_low_target
.breakpoint_len
);
5454 linux_init_signals ();
5455 linux_test_for_tracefork ();
5456 #ifdef HAVE_LINUX_REGSETS
5457 for (num_regsets
= 0; target_regsets
[num_regsets
].size
>= 0; num_regsets
++)
5459 disabled_regsets
= xmalloc (num_regsets
);
5462 sigchld_action
.sa_handler
= sigchld_handler
;
5463 sigemptyset (&sigchld_action
.sa_mask
);
5464 sigchld_action
.sa_flags
= SA_RESTART
;
5465 sigaction (SIGCHLD
, &sigchld_action
, NULL
);