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 /* Return non-zero if HEADER is a 64-bit ELF file. */
192 elf_64_header_p (const Elf64_Ehdr
*header
)
194 return (header
->e_ident
[EI_MAG0
] == ELFMAG0
195 && header
->e_ident
[EI_MAG1
] == ELFMAG1
196 && header
->e_ident
[EI_MAG2
] == ELFMAG2
197 && header
->e_ident
[EI_MAG3
] == ELFMAG3
198 && header
->e_ident
[EI_CLASS
] == ELFCLASS64
);
201 /* Return non-zero if FILE is a 64-bit ELF file,
202 zero if the file is not a 64-bit ELF file,
203 and -1 if the file is not accessible or doesn't exist. */
206 elf_64_file_p (const char *file
)
211 fd
= open (file
, O_RDONLY
);
215 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
222 return elf_64_header_p (&header
);
225 /* Accepts an integer PID; Returns true if the executable PID is
226 running is a 64-bit ELF file.. */
229 linux_pid_exe_is_elf_64_file (int pid
)
231 char file
[MAXPATHLEN
];
233 sprintf (file
, "/proc/%d/exe", pid
);
234 return elf_64_file_p (file
);
238 delete_lwp (struct lwp_info
*lwp
)
240 remove_thread (get_lwp_thread (lwp
));
241 remove_inferior (&all_lwps
, &lwp
->head
);
242 free (lwp
->arch_private
);
246 /* Add a process to the common process list, and set its private
249 static struct process_info
*
250 linux_add_process (int pid
, int attached
)
252 struct process_info
*proc
;
254 /* Is this the first process? If so, then set the arch. */
255 if (all_processes
.head
== NULL
)
258 proc
= add_process (pid
, attached
);
259 proc
->private = xcalloc (1, sizeof (*proc
->private));
261 if (the_low_target
.new_process
!= NULL
)
262 proc
->private->arch_private
= the_low_target
.new_process ();
267 /* Wrapper function for waitpid which handles EINTR, and emulates
268 __WALL for systems where that is not available. */
271 my_waitpid (int pid
, int *status
, int flags
)
276 fprintf (stderr
, "my_waitpid (%d, 0x%x)\n", pid
, flags
);
280 sigset_t block_mask
, org_mask
, wake_mask
;
283 wnohang
= (flags
& WNOHANG
) != 0;
284 flags
&= ~(__WALL
| __WCLONE
);
287 /* Block all signals while here. This avoids knowing about
288 LinuxThread's signals. */
289 sigfillset (&block_mask
);
290 sigprocmask (SIG_BLOCK
, &block_mask
, &org_mask
);
292 /* ... except during the sigsuspend below. */
293 sigemptyset (&wake_mask
);
297 /* Since all signals are blocked, there's no need to check
299 ret
= waitpid (pid
, status
, flags
);
302 if (ret
== -1 && out_errno
!= ECHILD
)
307 if (flags
& __WCLONE
)
309 /* We've tried both flavors now. If WNOHANG is set,
310 there's nothing else to do, just bail out. */
315 fprintf (stderr
, "blocking\n");
317 /* Block waiting for signals. */
318 sigsuspend (&wake_mask
);
324 sigprocmask (SIG_SETMASK
, &org_mask
, NULL
);
329 ret
= waitpid (pid
, status
, flags
);
330 while (ret
== -1 && errno
== EINTR
);
335 fprintf (stderr
, "my_waitpid (%d, 0x%x): status(%x), %d\n",
336 pid
, flags
, status
? *status
: -1, ret
);
342 /* Handle a GNU/Linux extended wait response. If we see a clone
343 event, we need to add the new LWP to our list (and not report the
344 trap to higher layers). */
347 handle_extended_wait (struct lwp_info
*event_child
, int wstat
)
349 int event
= wstat
>> 16;
350 struct lwp_info
*new_lwp
;
352 if (event
== PTRACE_EVENT_CLONE
)
355 unsigned long new_pid
;
356 int ret
, status
= W_STOPCODE (SIGSTOP
);
358 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_child
), 0, &new_pid
);
360 /* If we haven't already seen the new PID stop, wait for it now. */
361 if (! pull_pid_from_list (&stopped_pids
, new_pid
))
363 /* The new child has a pending SIGSTOP. We can't affect it until it
364 hits the SIGSTOP, but we're already attached. */
366 ret
= my_waitpid (new_pid
, &status
, __WALL
);
369 perror_with_name ("waiting for new child");
370 else if (ret
!= new_pid
)
371 warning ("wait returned unexpected PID %d", ret
);
372 else if (!WIFSTOPPED (status
))
373 warning ("wait returned unexpected status 0x%x", status
);
376 linux_enable_event_reporting (new_pid
);
378 ptid
= ptid_build (pid_of (event_child
), new_pid
, 0);
379 new_lwp
= (struct lwp_info
*) add_lwp (ptid
);
380 add_thread (ptid
, new_lwp
);
382 /* Either we're going to immediately resume the new thread
383 or leave it stopped. linux_resume_one_lwp is a nop if it
384 thinks the thread is currently running, so set this first
385 before calling linux_resume_one_lwp. */
386 new_lwp
->stopped
= 1;
388 /* Normally we will get the pending SIGSTOP. But in some cases
389 we might get another signal delivered to the group first.
390 If we do get another signal, be sure not to lose it. */
391 if (WSTOPSIG (status
) == SIGSTOP
)
393 if (stopping_threads
)
394 new_lwp
->stop_pc
= get_stop_pc (new_lwp
);
396 linux_resume_one_lwp (new_lwp
, 0, 0, NULL
);
400 new_lwp
->stop_expected
= 1;
402 if (stopping_threads
)
404 new_lwp
->stop_pc
= get_stop_pc (new_lwp
);
405 new_lwp
->status_pending_p
= 1;
406 new_lwp
->status_pending
= status
;
409 /* Pass the signal on. This is what GDB does - except
410 shouldn't we really report it instead? */
411 linux_resume_one_lwp (new_lwp
, 0, WSTOPSIG (status
), NULL
);
414 /* Always resume the current thread. If we are stopping
415 threads, it will have a pending SIGSTOP; we may as well
417 linux_resume_one_lwp (event_child
, event_child
->stepping
, 0, NULL
);
421 /* Return the PC as read from the regcache of LWP, without any
425 get_pc (struct lwp_info
*lwp
)
427 struct thread_info
*saved_inferior
;
428 struct regcache
*regcache
;
431 if (the_low_target
.get_pc
== NULL
)
434 saved_inferior
= current_inferior
;
435 current_inferior
= get_lwp_thread (lwp
);
437 regcache
= get_thread_regcache (current_inferior
, 1);
438 pc
= (*the_low_target
.get_pc
) (regcache
);
441 fprintf (stderr
, "pc is 0x%lx\n", (long) pc
);
443 current_inferior
= saved_inferior
;
447 /* This function should only be called if LWP got a SIGTRAP.
448 The SIGTRAP could mean several things.
450 On i386, where decr_pc_after_break is non-zero:
451 If we were single-stepping this process using PTRACE_SINGLESTEP,
452 we will get only the one SIGTRAP (even if the instruction we
453 stepped over was a breakpoint). The value of $eip will be the
455 If we continue the process using PTRACE_CONT, we will get a
456 SIGTRAP when we hit a breakpoint. The value of $eip will be
457 the instruction after the breakpoint (i.e. needs to be
458 decremented). If we report the SIGTRAP to GDB, we must also
459 report the undecremented PC. If we cancel the SIGTRAP, we
460 must resume at the decremented PC.
462 (Presumably, not yet tested) On a non-decr_pc_after_break machine
463 with hardware or kernel single-step:
464 If we single-step over a breakpoint instruction, our PC will
465 point at the following instruction. If we continue and hit a
466 breakpoint instruction, our PC will point at the breakpoint
470 get_stop_pc (struct lwp_info
*lwp
)
474 if (the_low_target
.get_pc
== NULL
)
477 stop_pc
= get_pc (lwp
);
479 if (WSTOPSIG (lwp
->last_status
) == SIGTRAP
481 && !lwp
->stopped_by_watchpoint
482 && lwp
->last_status
>> 16 == 0)
483 stop_pc
-= the_low_target
.decr_pc_after_break
;
486 fprintf (stderr
, "stop pc is 0x%lx\n", (long) stop_pc
);
492 add_lwp (ptid_t ptid
)
494 struct lwp_info
*lwp
;
496 lwp
= (struct lwp_info
*) xmalloc (sizeof (*lwp
));
497 memset (lwp
, 0, sizeof (*lwp
));
501 if (the_low_target
.new_thread
!= NULL
)
502 lwp
->arch_private
= the_low_target
.new_thread ();
504 add_inferior_to_list (&all_lwps
, &lwp
->head
);
509 /* Start an inferior process and returns its pid.
510 ALLARGS is a vector of program-name and args. */
513 linux_create_inferior (char *program
, char **allargs
)
515 #ifdef HAVE_PERSONALITY
516 int personality_orig
= 0, personality_set
= 0;
518 struct lwp_info
*new_lwp
;
522 #ifdef HAVE_PERSONALITY
523 if (disable_randomization
)
526 personality_orig
= personality (0xffffffff);
527 if (errno
== 0 && !(personality_orig
& ADDR_NO_RANDOMIZE
))
530 personality (personality_orig
| ADDR_NO_RANDOMIZE
);
532 if (errno
!= 0 || (personality_set
533 && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE
)))
534 warning ("Error disabling address space randomization: %s",
539 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
545 perror_with_name ("fork");
549 ptrace (PTRACE_TRACEME
, 0, 0, 0);
551 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
552 signal (__SIGRTMIN
+ 1, SIG_DFL
);
557 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
558 stdout to stderr so that inferior i/o doesn't corrupt the connection.
559 Also, redirect stdin to /dev/null. */
560 if (remote_connection_is_stdio ())
563 open ("/dev/null", O_RDONLY
);
565 if (write (2, "stdin/stdout redirected\n",
566 sizeof ("stdin/stdout redirected\n") - 1) < 0)
567 /* Errors ignored. */;
570 execv (program
, allargs
);
572 execvp (program
, allargs
);
574 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
580 #ifdef HAVE_PERSONALITY
584 personality (personality_orig
);
586 warning ("Error restoring address space randomization: %s",
591 linux_add_process (pid
, 0);
593 ptid
= ptid_build (pid
, pid
, 0);
594 new_lwp
= add_lwp (ptid
);
595 add_thread (ptid
, new_lwp
);
596 new_lwp
->must_set_ptrace_flags
= 1;
601 /* Attach to an inferior process. */
604 linux_attach_lwp_1 (unsigned long lwpid
, int initial
)
607 struct lwp_info
*new_lwp
;
609 if (ptrace (PTRACE_ATTACH
, lwpid
, 0, 0) != 0)
613 /* If we fail to attach to an LWP, just warn. */
614 fprintf (stderr
, "Cannot attach to lwp %ld: %s (%d)\n", lwpid
,
615 strerror (errno
), errno
);
620 /* If we fail to attach to a process, report an error. */
621 error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid
,
622 strerror (errno
), errno
);
626 /* If lwp is the tgid, we handle adding existing threads later.
627 Otherwise we just add lwp without bothering about any other
629 ptid
= ptid_build (lwpid
, lwpid
, 0);
632 /* Note that extracting the pid from the current inferior is
633 safe, since we're always called in the context of the same
634 process as this new thread. */
635 int pid
= pid_of (get_thread_lwp (current_inferior
));
636 ptid
= ptid_build (pid
, lwpid
, 0);
639 new_lwp
= (struct lwp_info
*) add_lwp (ptid
);
640 add_thread (ptid
, new_lwp
);
642 /* We need to wait for SIGSTOP before being able to make the next
643 ptrace call on this LWP. */
644 new_lwp
->must_set_ptrace_flags
= 1;
646 if (linux_proc_pid_is_stopped (lwpid
))
650 "Attached to a stopped process\n");
652 /* The process is definitely stopped. It is in a job control
653 stop, unless the kernel predates the TASK_STOPPED /
654 TASK_TRACED distinction, in which case it might be in a
655 ptrace stop. Make sure it is in a ptrace stop; from there we
656 can kill it, signal it, et cetera.
658 First make sure there is a pending SIGSTOP. Since we are
659 already attached, the process can not transition from stopped
660 to running without a PTRACE_CONT; so we know this signal will
661 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
662 probably already in the queue (unless this kernel is old
663 enough to use TASK_STOPPED for ptrace stops); but since
664 SIGSTOP is not an RT signal, it can only be queued once. */
665 kill_lwp (lwpid
, SIGSTOP
);
667 /* Finally, resume the stopped process. This will deliver the
668 SIGSTOP (or a higher priority signal, just like normal
669 PTRACE_ATTACH), which we'll catch later on. */
670 ptrace (PTRACE_CONT
, lwpid
, 0, 0);
673 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
676 There are several cases to consider here:
678 1) gdbserver has already attached to the process and is being notified
679 of a new thread that is being created.
680 In this case we should ignore that SIGSTOP and resume the
681 process. This is handled below by setting stop_expected = 1,
682 and the fact that add_thread sets last_resume_kind ==
685 2) This is the first thread (the process thread), and we're attaching
686 to it via attach_inferior.
687 In this case we want the process thread to stop.
688 This is handled by having linux_attach set last_resume_kind ==
689 resume_stop after we return.
691 If the pid we are attaching to is also the tgid, we attach to and
692 stop all the existing threads. Otherwise, we attach to pid and
693 ignore any other threads in the same group as this pid.
695 3) GDB is connecting to gdbserver and is requesting an enumeration of all
697 In this case we want the thread to stop.
698 FIXME: This case is currently not properly handled.
699 We should wait for the SIGSTOP but don't. Things work apparently
700 because enough time passes between when we ptrace (ATTACH) and when
701 gdb makes the next ptrace call on the thread.
703 On the other hand, if we are currently trying to stop all threads, we
704 should treat the new thread as if we had sent it a SIGSTOP. This works
705 because we are guaranteed that the add_lwp call above added us to the
706 end of the list, and so the new thread has not yet reached
707 wait_for_sigstop (but will). */
708 new_lwp
->stop_expected
= 1;
712 linux_attach_lwp (unsigned long lwpid
)
714 linux_attach_lwp_1 (lwpid
, 0);
717 /* Attach to PID. If PID is the tgid, attach to it and all
721 linux_attach (unsigned long pid
)
723 /* Attach to PID. We will check for other threads
725 linux_attach_lwp_1 (pid
, 1);
726 linux_add_process (pid
, 1);
730 struct thread_info
*thread
;
732 /* Don't ignore the initial SIGSTOP if we just attached to this
733 process. It will be collected by wait shortly. */
734 thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
735 thread
->last_resume_kind
= resume_stop
;
738 if (linux_proc_get_tgid (pid
) == pid
)
743 sprintf (pathname
, "/proc/%ld/task", pid
);
745 dir
= opendir (pathname
);
749 fprintf (stderr
, "Could not open /proc/%ld/task.\n", pid
);
754 /* At this point we attached to the tgid. Scan the task for
757 int new_threads_found
;
761 while (iterations
< 2)
763 new_threads_found
= 0;
764 /* Add all the other threads. While we go through the
765 threads, new threads may be spawned. Cycle through
766 the list of threads until we have done two iterations without
767 finding new threads. */
768 while ((dp
= readdir (dir
)) != NULL
)
771 lwp
= strtoul (dp
->d_name
, NULL
, 10);
773 /* Is this a new thread? */
775 && find_thread_ptid (ptid_build (pid
, lwp
, 0)) == NULL
)
777 linux_attach_lwp_1 (lwp
, 0);
782 Found and attached to new lwp %ld\n", lwp
);
786 if (!new_threads_found
)
807 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
809 struct counter
*counter
= args
;
811 if (ptid_get_pid (entry
->id
) == counter
->pid
)
813 if (++counter
->count
> 1)
821 last_thread_of_process_p (struct thread_info
*thread
)
823 ptid_t ptid
= ((struct inferior_list_entry
*)thread
)->id
;
824 int pid
= ptid_get_pid (ptid
);
825 struct counter counter
= { pid
, 0 };
827 return (find_inferior (&all_threads
,
828 second_thread_of_pid_p
, &counter
) == NULL
);
834 linux_kill_one_lwp (struct lwp_info
*lwp
)
836 int pid
= lwpid_of (lwp
);
838 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
839 there is no signal context, and ptrace(PTRACE_KILL) (or
840 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
841 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
842 alternative is to kill with SIGKILL. We only need one SIGKILL
843 per process, not one for each thread. But since we still support
844 linuxthreads, and we also support debugging programs using raw
845 clone without CLONE_THREAD, we send one for each thread. For
846 years, we used PTRACE_KILL only, so we're being a bit paranoid
847 about some old kernels where PTRACE_KILL might work better
848 (dubious if there are any such, but that's why it's paranoia), so
849 we try SIGKILL first, PTRACE_KILL second, and so we're fine
856 "LKL: kill (SIGKILL) %s, 0, 0 (%s)\n",
857 target_pid_to_str (ptid_of (lwp
)),
858 errno
? strerror (errno
) : "OK");
861 ptrace (PTRACE_KILL
, pid
, 0, 0);
864 "LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
865 target_pid_to_str (ptid_of (lwp
)),
866 errno
? strerror (errno
) : "OK");
869 /* Callback for `find_inferior'. Kills an lwp of a given process,
870 except the leader. */
873 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
875 struct thread_info
*thread
= (struct thread_info
*) entry
;
876 struct lwp_info
*lwp
= get_thread_lwp (thread
);
878 int pid
= * (int *) args
;
880 if (ptid_get_pid (entry
->id
) != pid
)
883 /* We avoid killing the first thread here, because of a Linux kernel (at
884 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
885 the children get a chance to be reaped, it will remain a zombie
888 if (lwpid_of (lwp
) == pid
)
891 fprintf (stderr
, "lkop: is last of process %s\n",
892 target_pid_to_str (entry
->id
));
898 linux_kill_one_lwp (lwp
);
900 /* Make sure it died. The loop is most likely unnecessary. */
901 pid
= linux_wait_for_event (lwp
->head
.id
, &wstat
, __WALL
);
902 } while (pid
> 0 && WIFSTOPPED (wstat
));
910 struct process_info
*process
;
911 struct lwp_info
*lwp
;
915 process
= find_process_pid (pid
);
919 /* If we're killing a running inferior, make sure it is stopped
920 first, as PTRACE_KILL will not work otherwise. */
921 stop_all_lwps (0, NULL
);
923 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
925 /* See the comment in linux_kill_one_lwp. We did not kill the first
926 thread in the list, so do so now. */
927 lwp
= find_lwp_pid (pid_to_ptid (pid
));
932 fprintf (stderr
, "lk_1: cannot find lwp %ld, for pid: %d\n",
933 lwpid_of (lwp
), pid
);
938 fprintf (stderr
, "lk_1: killing lwp %ld, for pid: %d\n",
939 lwpid_of (lwp
), pid
);
943 linux_kill_one_lwp (lwp
);
945 /* Make sure it died. The loop is most likely unnecessary. */
946 lwpid
= linux_wait_for_event (lwp
->head
.id
, &wstat
, __WALL
);
947 } while (lwpid
> 0 && WIFSTOPPED (wstat
));
950 the_target
->mourn (process
);
952 /* Since we presently can only stop all lwps of all processes, we
953 need to unstop lwps of other processes. */
954 unstop_all_lwps (0, NULL
);
959 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
961 struct thread_info
*thread
= (struct thread_info
*) entry
;
962 struct lwp_info
*lwp
= get_thread_lwp (thread
);
963 int pid
= * (int *) args
;
965 if (ptid_get_pid (entry
->id
) != pid
)
968 /* If this process is stopped but is expecting a SIGSTOP, then make
969 sure we take care of that now. This isn't absolutely guaranteed
970 to collect the SIGSTOP, but is fairly likely to. */
971 if (lwp
->stop_expected
)
974 /* Clear stop_expected, so that the SIGSTOP will be reported. */
975 lwp
->stop_expected
= 0;
976 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
977 linux_wait_for_event (lwp
->head
.id
, &wstat
, __WALL
);
980 /* Flush any pending changes to the process's registers. */
981 regcache_invalidate_one ((struct inferior_list_entry
*)
982 get_lwp_thread (lwp
));
984 /* Finally, let it resume. */
985 if (the_low_target
.prepare_to_resume
!= NULL
)
986 the_low_target
.prepare_to_resume (lwp
);
987 ptrace (PTRACE_DETACH
, lwpid_of (lwp
), 0, 0);
994 linux_detach (int pid
)
996 struct process_info
*process
;
998 process
= find_process_pid (pid
);
1002 /* Stop all threads before detaching. First, ptrace requires that
1003 the thread is stopped to sucessfully detach. Second, thread_db
1004 may need to uninstall thread event breakpoints from memory, which
1005 only works with a stopped process anyway. */
1006 stop_all_lwps (0, NULL
);
1008 #ifdef USE_THREAD_DB
1009 thread_db_detach (process
);
1012 /* Stabilize threads (move out of jump pads). */
1013 stabilize_threads ();
1015 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
1017 the_target
->mourn (process
);
1019 /* Since we presently can only stop all lwps of all processes, we
1020 need to unstop lwps of other processes. */
1021 unstop_all_lwps (0, NULL
);
1025 /* Remove all LWPs that belong to process PROC from the lwp list. */
1028 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1030 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
1031 struct process_info
*process
= proc
;
1033 if (pid_of (lwp
) == pid_of (process
))
1040 linux_mourn (struct process_info
*process
)
1042 struct process_info_private
*priv
;
1044 #ifdef USE_THREAD_DB
1045 thread_db_mourn (process
);
1048 find_inferior (&all_lwps
, delete_lwp_callback
, process
);
1050 /* Freeing all private data. */
1051 priv
= process
->private;
1052 free (priv
->arch_private
);
1054 process
->private = NULL
;
1056 remove_process (process
);
1060 linux_join (int pid
)
1065 ret
= my_waitpid (pid
, &status
, 0);
1066 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1068 } while (ret
!= -1 || errno
!= ECHILD
);
1071 /* Return nonzero if the given thread is still alive. */
1073 linux_thread_alive (ptid_t ptid
)
1075 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1077 /* We assume we always know if a thread exits. If a whole process
1078 exited but we still haven't been able to report it to GDB, we'll
1079 hold on to the last lwp of the dead process. */
1086 /* Return 1 if this lwp has an interesting status pending. */
1088 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1090 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
1091 ptid_t ptid
= * (ptid_t
*) arg
;
1092 struct thread_info
*thread
;
1094 /* Check if we're only interested in events from a specific process
1096 if (!ptid_equal (minus_one_ptid
, ptid
)
1097 && ptid_get_pid (ptid
) != ptid_get_pid (lwp
->head
.id
))
1100 thread
= get_lwp_thread (lwp
);
1102 /* If we got a `vCont;t', but we haven't reported a stop yet, do
1103 report any status pending the LWP may have. */
1104 if (thread
->last_resume_kind
== resume_stop
1105 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
1108 return lwp
->status_pending_p
;
1112 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1114 ptid_t ptid
= *(ptid_t
*) data
;
1117 if (ptid_get_lwp (ptid
) != 0)
1118 lwp
= ptid_get_lwp (ptid
);
1120 lwp
= ptid_get_pid (ptid
);
1122 if (ptid_get_lwp (entry
->id
) == lwp
)
1129 find_lwp_pid (ptid_t ptid
)
1131 return (struct lwp_info
*) find_inferior (&all_lwps
, same_lwp
, &ptid
);
1134 static struct lwp_info
*
1135 linux_wait_for_lwp (ptid_t ptid
, int *wstatp
, int options
)
1138 int to_wait_for
= -1;
1139 struct lwp_info
*child
= NULL
;
1142 fprintf (stderr
, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid
));
1144 if (ptid_equal (ptid
, minus_one_ptid
))
1145 to_wait_for
= -1; /* any child */
1147 to_wait_for
= ptid_get_lwp (ptid
); /* this lwp only */
1153 ret
= my_waitpid (to_wait_for
, wstatp
, options
);
1154 if (ret
== 0 || (ret
== -1 && errno
== ECHILD
&& (options
& WNOHANG
)))
1157 perror_with_name ("waitpid");
1160 && (!WIFSTOPPED (*wstatp
)
1161 || (WSTOPSIG (*wstatp
) != 32
1162 && WSTOPSIG (*wstatp
) != 33)))
1163 fprintf (stderr
, "Got an event from %d (%x)\n", ret
, *wstatp
);
1165 child
= find_lwp_pid (pid_to_ptid (ret
));
1167 /* If we didn't find a process, one of two things presumably happened:
1168 - A process we started and then detached from has exited. Ignore it.
1169 - A process we are controlling has forked and the new child's stop
1170 was reported to us by the kernel. Save its PID. */
1171 if (child
== NULL
&& WIFSTOPPED (*wstatp
))
1173 add_pid_to_list (&stopped_pids
, ret
);
1176 else if (child
== NULL
)
1181 child
->last_status
= *wstatp
;
1183 /* Architecture-specific setup after inferior is running.
1184 This needs to happen after we have attached to the inferior
1185 and it is stopped for the first time, but before we access
1186 any inferior registers. */
1189 the_low_target
.arch_setup ();
1190 #ifdef HAVE_LINUX_REGSETS
1191 memset (disabled_regsets
, 0, num_regsets
);
1196 /* Fetch the possibly triggered data watchpoint info and store it in
1199 On some archs, like x86, that use debug registers to set
1200 watchpoints, it's possible that the way to know which watched
1201 address trapped, is to check the register that is used to select
1202 which address to watch. Problem is, between setting the
1203 watchpoint and reading back which data address trapped, the user
1204 may change the set of watchpoints, and, as a consequence, GDB
1205 changes the debug registers in the inferior. To avoid reading
1206 back a stale stopped-data-address when that happens, we cache in
1207 LP the fact that a watchpoint trapped, and the corresponding data
1208 address, as soon as we see CHILD stop with a SIGTRAP. If GDB
1209 changes the debug registers meanwhile, we have the cached data we
1212 if (WIFSTOPPED (*wstatp
) && WSTOPSIG (*wstatp
) == SIGTRAP
)
1214 if (the_low_target
.stopped_by_watchpoint
== NULL
)
1216 child
->stopped_by_watchpoint
= 0;
1220 struct thread_info
*saved_inferior
;
1222 saved_inferior
= current_inferior
;
1223 current_inferior
= get_lwp_thread (child
);
1225 child
->stopped_by_watchpoint
1226 = the_low_target
.stopped_by_watchpoint ();
1228 if (child
->stopped_by_watchpoint
)
1230 if (the_low_target
.stopped_data_address
!= NULL
)
1231 child
->stopped_data_address
1232 = the_low_target
.stopped_data_address ();
1234 child
->stopped_data_address
= 0;
1237 current_inferior
= saved_inferior
;
1241 /* Store the STOP_PC, with adjustment applied. This depends on the
1242 architecture being defined already (so that CHILD has a valid
1243 regcache), and on LAST_STATUS being set (to check for SIGTRAP or
1245 if (WIFSTOPPED (*wstatp
))
1246 child
->stop_pc
= get_stop_pc (child
);
1249 && WIFSTOPPED (*wstatp
)
1250 && the_low_target
.get_pc
!= NULL
)
1252 struct thread_info
*saved_inferior
= current_inferior
;
1253 struct regcache
*regcache
;
1256 current_inferior
= get_lwp_thread (child
);
1257 regcache
= get_thread_regcache (current_inferior
, 1);
1258 pc
= (*the_low_target
.get_pc
) (regcache
);
1259 fprintf (stderr
, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc
);
1260 current_inferior
= saved_inferior
;
1266 /* This function should only be called if the LWP got a SIGTRAP.
1268 Handle any tracepoint steps or hits. Return true if a tracepoint
1269 event was handled, 0 otherwise. */
1272 handle_tracepoints (struct lwp_info
*lwp
)
1274 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1275 int tpoint_related_event
= 0;
1277 /* If this tracepoint hit causes a tracing stop, we'll immediately
1278 uninsert tracepoints. To do this, we temporarily pause all
1279 threads, unpatch away, and then unpause threads. We need to make
1280 sure the unpausing doesn't resume LWP too. */
1283 /* And we need to be sure that any all-threads-stopping doesn't try
1284 to move threads out of the jump pads, as it could deadlock the
1285 inferior (LWP could be in the jump pad, maybe even holding the
1288 /* Do any necessary step collect actions. */
1289 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1291 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1293 /* See if we just hit a tracepoint and do its main collect
1295 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1299 gdb_assert (lwp
->suspended
== 0);
1300 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
1302 if (tpoint_related_event
)
1305 fprintf (stderr
, "got a tracepoint event\n");
1312 /* Convenience wrapper. Returns true if LWP is presently collecting a
1316 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
1317 struct fast_tpoint_collect_status
*status
)
1319 CORE_ADDR thread_area
;
1321 if (the_low_target
.get_thread_area
== NULL
)
1324 /* Get the thread area address. This is used to recognize which
1325 thread is which when tracing with the in-process agent library.
1326 We don't read anything from the address, and treat it as opaque;
1327 it's the address itself that we assume is unique per-thread. */
1328 if ((*the_low_target
.get_thread_area
) (lwpid_of (lwp
), &thread_area
) == -1)
1331 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1334 /* The reason we resume in the caller, is because we want to be able
1335 to pass lwp->status_pending as WSTAT, and we need to clear
1336 status_pending_p before resuming, otherwise, linux_resume_one_lwp
1337 refuses to resume. */
1340 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
1342 struct thread_info
*saved_inferior
;
1344 saved_inferior
= current_inferior
;
1345 current_inferior
= get_lwp_thread (lwp
);
1348 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
1349 && supports_fast_tracepoints ()
1350 && in_process_agent_loaded ())
1352 struct fast_tpoint_collect_status status
;
1357 Checking whether LWP %ld needs to move out of the jump pad.\n",
1360 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
1363 || (WSTOPSIG (*wstat
) != SIGILL
1364 && WSTOPSIG (*wstat
) != SIGFPE
1365 && WSTOPSIG (*wstat
) != SIGSEGV
1366 && WSTOPSIG (*wstat
) != SIGBUS
))
1368 lwp
->collecting_fast_tracepoint
= r
;
1372 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
1374 /* Haven't executed the original instruction yet.
1375 Set breakpoint there, and wait till it's hit,
1376 then single-step until exiting the jump pad. */
1377 lwp
->exit_jump_pad_bkpt
1378 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
1383 Checking whether LWP %ld needs to move out of the jump pad...it does\n",
1385 current_inferior
= saved_inferior
;
1392 /* If we get a synchronous signal while collecting, *and*
1393 while executing the (relocated) original instruction,
1394 reset the PC to point at the tpoint address, before
1395 reporting to GDB. Otherwise, it's an IPA lib bug: just
1396 report the signal to GDB, and pray for the best. */
1398 lwp
->collecting_fast_tracepoint
= 0;
1401 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
1402 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
1405 struct regcache
*regcache
;
1407 /* The si_addr on a few signals references the address
1408 of the faulting instruction. Adjust that as
1410 if ((WSTOPSIG (*wstat
) == SIGILL
1411 || WSTOPSIG (*wstat
) == SIGFPE
1412 || WSTOPSIG (*wstat
) == SIGBUS
1413 || WSTOPSIG (*wstat
) == SIGSEGV
)
1414 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (lwp
), 0, &info
) == 0
1415 /* Final check just to make sure we don't clobber
1416 the siginfo of non-kernel-sent signals. */
1417 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
1419 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
1420 ptrace (PTRACE_SETSIGINFO
, lwpid_of (lwp
), 0, &info
);
1423 regcache
= get_thread_regcache (get_lwp_thread (lwp
), 1);
1424 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
1425 lwp
->stop_pc
= status
.tpoint_addr
;
1427 /* Cancel any fast tracepoint lock this thread was
1429 force_unlock_trace_buffer ();
1432 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
1436 "Cancelling fast exit-jump-pad: removing bkpt. "
1437 "stopping all threads momentarily.\n");
1439 stop_all_lwps (1, lwp
);
1440 cancel_breakpoints ();
1442 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
1443 lwp
->exit_jump_pad_bkpt
= NULL
;
1445 unstop_all_lwps (1, lwp
);
1447 gdb_assert (lwp
->suspended
>= 0);
1454 Checking whether LWP %ld needs to move out of the jump pad...no\n",
1457 current_inferior
= saved_inferior
;
1461 /* Enqueue one signal in the "signals to report later when out of the
1465 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1467 struct pending_signals
*p_sig
;
1471 Deferring signal %d for LWP %ld.\n", WSTOPSIG (*wstat
), lwpid_of (lwp
));
1475 struct pending_signals
*sig
;
1477 for (sig
= lwp
->pending_signals_to_report
;
1481 " Already queued %d\n",
1484 fprintf (stderr
, " (no more currently queued signals)\n");
1487 /* Don't enqueue non-RT signals if they are already in the deferred
1488 queue. (SIGSTOP being the easiest signal to see ending up here
1490 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
1492 struct pending_signals
*sig
;
1494 for (sig
= lwp
->pending_signals_to_report
;
1498 if (sig
->signal
== WSTOPSIG (*wstat
))
1502 "Not requeuing already queued non-RT signal %d"
1511 p_sig
= xmalloc (sizeof (*p_sig
));
1512 p_sig
->prev
= lwp
->pending_signals_to_report
;
1513 p_sig
->signal
= WSTOPSIG (*wstat
);
1514 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
1515 ptrace (PTRACE_GETSIGINFO
, lwpid_of (lwp
), 0, &p_sig
->info
);
1517 lwp
->pending_signals_to_report
= p_sig
;
1520 /* Dequeue one signal from the "signals to report later when out of
1521 the jump pad" list. */
1524 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1526 if (lwp
->pending_signals_to_report
!= NULL
)
1528 struct pending_signals
**p_sig
;
1530 p_sig
= &lwp
->pending_signals_to_report
;
1531 while ((*p_sig
)->prev
!= NULL
)
1532 p_sig
= &(*p_sig
)->prev
;
1534 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
1535 if ((*p_sig
)->info
.si_signo
!= 0)
1536 ptrace (PTRACE_SETSIGINFO
, lwpid_of (lwp
), 0, &(*p_sig
)->info
);
1541 fprintf (stderr
, "Reporting deferred signal %d for LWP %ld.\n",
1542 WSTOPSIG (*wstat
), lwpid_of (lwp
));
1546 struct pending_signals
*sig
;
1548 for (sig
= lwp
->pending_signals_to_report
;
1552 " Still queued %d\n",
1555 fprintf (stderr
, " (no more queued signals)\n");
1564 /* Arrange for a breakpoint to be hit again later. We don't keep the
1565 SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We
1566 will handle the current event, eventually we will resume this LWP,
1567 and this breakpoint will trap again. */
1570 cancel_breakpoint (struct lwp_info
*lwp
)
1572 struct thread_info
*saved_inferior
;
1574 /* There's nothing to do if we don't support breakpoints. */
1575 if (!supports_breakpoints ())
1578 /* breakpoint_at reads from current inferior. */
1579 saved_inferior
= current_inferior
;
1580 current_inferior
= get_lwp_thread (lwp
);
1582 if ((*the_low_target
.breakpoint_at
) (lwp
->stop_pc
))
1586 "CB: Push back breakpoint for %s\n",
1587 target_pid_to_str (ptid_of (lwp
)));
1589 /* Back up the PC if necessary. */
1590 if (the_low_target
.decr_pc_after_break
)
1592 struct regcache
*regcache
1593 = get_thread_regcache (current_inferior
, 1);
1594 (*the_low_target
.set_pc
) (regcache
, lwp
->stop_pc
);
1597 current_inferior
= saved_inferior
;
1604 "CB: No breakpoint found at %s for [%s]\n",
1605 paddress (lwp
->stop_pc
),
1606 target_pid_to_str (ptid_of (lwp
)));
1609 current_inferior
= saved_inferior
;
1613 /* When the event-loop is doing a step-over, this points at the thread
1615 ptid_t step_over_bkpt
;
1617 /* Wait for an event from child PID. If PID is -1, wait for any
1618 child. Store the stop status through the status pointer WSTAT.
1619 OPTIONS is passed to the waitpid call. Return 0 if no child stop
1620 event was found and OPTIONS contains WNOHANG. Return the PID of
1621 the stopped child otherwise. */
1624 linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
)
1626 struct lwp_info
*event_child
, *requested_child
;
1630 requested_child
= NULL
;
1632 /* Check for a lwp with a pending status. */
1634 if (ptid_equal (ptid
, minus_one_ptid
) || ptid_is_pid (ptid
))
1636 event_child
= (struct lwp_info
*)
1637 find_inferior (&all_lwps
, status_pending_p_callback
, &ptid
);
1638 if (debug_threads
&& event_child
)
1639 fprintf (stderr
, "Got a pending child %ld\n", lwpid_of (event_child
));
1643 requested_child
= find_lwp_pid (ptid
);
1645 if (!stopping_threads
1646 && requested_child
->status_pending_p
1647 && requested_child
->collecting_fast_tracepoint
)
1649 enqueue_one_deferred_signal (requested_child
,
1650 &requested_child
->status_pending
);
1651 requested_child
->status_pending_p
= 0;
1652 requested_child
->status_pending
= 0;
1653 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
1656 if (requested_child
->suspended
1657 && requested_child
->status_pending_p
)
1658 fatal ("requesting an event out of a suspended child?");
1660 if (requested_child
->status_pending_p
)
1661 event_child
= requested_child
;
1664 if (event_child
!= NULL
)
1667 fprintf (stderr
, "Got an event from pending child %ld (%04x)\n",
1668 lwpid_of (event_child
), event_child
->status_pending
);
1669 *wstat
= event_child
->status_pending
;
1670 event_child
->status_pending_p
= 0;
1671 event_child
->status_pending
= 0;
1672 current_inferior
= get_lwp_thread (event_child
);
1673 return lwpid_of (event_child
);
1676 if (ptid_is_pid (ptid
))
1678 /* A request to wait for a specific tgid. This is not possible
1679 with waitpid, so instead, we wait for any child, and leave
1680 children we're not interested in right now with a pending
1681 status to report later. */
1682 wait_ptid
= minus_one_ptid
;
1687 /* We only enter this loop if no process has a pending wait status. Thus
1688 any action taken in response to a wait status inside this loop is
1689 responding as soon as we detect the status, not after any pending
1693 event_child
= linux_wait_for_lwp (wait_ptid
, wstat
, options
);
1695 if ((options
& WNOHANG
) && event_child
== NULL
)
1698 fprintf (stderr
, "WNOHANG set, no event found\n");
1702 if (event_child
== NULL
)
1703 error ("event from unknown child");
1705 if (ptid_is_pid (ptid
)
1706 && ptid_get_pid (ptid
) != ptid_get_pid (ptid_of (event_child
)))
1708 if (! WIFSTOPPED (*wstat
))
1709 mark_lwp_dead (event_child
, *wstat
);
1712 event_child
->status_pending_p
= 1;
1713 event_child
->status_pending
= *wstat
;
1718 current_inferior
= get_lwp_thread (event_child
);
1720 /* Check for thread exit. */
1721 if (! WIFSTOPPED (*wstat
))
1724 fprintf (stderr
, "LWP %ld exiting\n", lwpid_of (event_child
));
1726 /* If the last thread is exiting, just return. */
1727 if (last_thread_of_process_p (current_inferior
))
1730 fprintf (stderr
, "LWP %ld is last lwp of process\n",
1731 lwpid_of (event_child
));
1732 return lwpid_of (event_child
);
1737 current_inferior
= (struct thread_info
*) all_threads
.head
;
1739 fprintf (stderr
, "Current inferior is now %ld\n",
1740 lwpid_of (get_thread_lwp (current_inferior
)));
1744 current_inferior
= NULL
;
1746 fprintf (stderr
, "Current inferior is now <NULL>\n");
1749 /* If we were waiting for this particular child to do something...
1750 well, it did something. */
1751 if (requested_child
!= NULL
)
1753 int lwpid
= lwpid_of (event_child
);
1755 /* Cancel the step-over operation --- the thread that
1756 started it is gone. */
1757 if (finish_step_over (event_child
))
1758 unstop_all_lwps (1, event_child
);
1759 delete_lwp (event_child
);
1763 delete_lwp (event_child
);
1765 /* Wait for a more interesting event. */
1769 if (event_child
->must_set_ptrace_flags
)
1771 linux_enable_event_reporting (lwpid_of (event_child
));
1772 event_child
->must_set_ptrace_flags
= 0;
1775 if (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) == SIGTRAP
1776 && *wstat
>> 16 != 0)
1778 handle_extended_wait (event_child
, *wstat
);
1782 if (WIFSTOPPED (*wstat
)
1783 && WSTOPSIG (*wstat
) == SIGSTOP
1784 && event_child
->stop_expected
)
1789 fprintf (stderr
, "Expected stop.\n");
1790 event_child
->stop_expected
= 0;
1792 should_stop
= (current_inferior
->last_resume_kind
== resume_stop
1793 || stopping_threads
);
1797 linux_resume_one_lwp (event_child
,
1798 event_child
->stepping
, 0, NULL
);
1803 return lwpid_of (event_child
);
1810 /* Count the LWP's that have had events. */
1813 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
1815 struct lwp_info
*lp
= (struct lwp_info
*) entry
;
1816 struct thread_info
*thread
= get_lwp_thread (lp
);
1819 gdb_assert (count
!= NULL
);
1821 /* Count only resumed LWPs that have a SIGTRAP event pending that
1822 should be reported to GDB. */
1823 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
1824 && thread
->last_resume_kind
!= resume_stop
1825 && lp
->status_pending_p
1826 && WIFSTOPPED (lp
->status_pending
)
1827 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
1828 && !breakpoint_inserted_here (lp
->stop_pc
))
1834 /* Select the LWP (if any) that is currently being single-stepped. */
1837 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
1839 struct lwp_info
*lp
= (struct lwp_info
*) entry
;
1840 struct thread_info
*thread
= get_lwp_thread (lp
);
1842 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
1843 && thread
->last_resume_kind
== resume_step
1844 && lp
->status_pending_p
)
1850 /* Select the Nth LWP that has had a SIGTRAP event that should be
1854 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
1856 struct lwp_info
*lp
= (struct lwp_info
*) entry
;
1857 struct thread_info
*thread
= get_lwp_thread (lp
);
1858 int *selector
= data
;
1860 gdb_assert (selector
!= NULL
);
1862 /* Select only resumed LWPs that have a SIGTRAP event pending. */
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
1868 && !breakpoint_inserted_here (lp
->stop_pc
))
1869 if ((*selector
)-- == 0)
1876 cancel_breakpoints_callback (struct inferior_list_entry
*entry
, void *data
)
1878 struct lwp_info
*lp
= (struct lwp_info
*) entry
;
1879 struct thread_info
*thread
= get_lwp_thread (lp
);
1880 struct lwp_info
*event_lp
= data
;
1882 /* Leave the LWP that has been elected to receive a SIGTRAP alone. */
1886 /* If a LWP other than the LWP that we're reporting an event for has
1887 hit a GDB breakpoint (as opposed to some random trap signal),
1888 then just arrange for it to hit it again later. We don't keep
1889 the SIGTRAP status and don't forward the SIGTRAP signal to the
1890 LWP. We will handle the current event, eventually we will resume
1891 all LWPs, and this one will get its breakpoint trap again.
1893 If we do not do this, then we run the risk that the user will
1894 delete or disable the breakpoint, but the LWP will have already
1897 if (thread
->last_resume_kind
!= resume_stop
1898 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
1899 && lp
->status_pending_p
1900 && WIFSTOPPED (lp
->status_pending
)
1901 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
1903 && !lp
->stopped_by_watchpoint
1904 && cancel_breakpoint (lp
))
1905 /* Throw away the SIGTRAP. */
1906 lp
->status_pending_p
= 0;
1912 linux_cancel_breakpoints (void)
1914 find_inferior (&all_lwps
, cancel_breakpoints_callback
, NULL
);
1917 /* Select one LWP out of those that have events pending. */
1920 select_event_lwp (struct lwp_info
**orig_lp
)
1923 int random_selector
;
1924 struct lwp_info
*event_lp
;
1926 /* Give preference to any LWP that is being single-stepped. */
1928 = (struct lwp_info
*) find_inferior (&all_lwps
,
1929 select_singlestep_lwp_callback
, NULL
);
1930 if (event_lp
!= NULL
)
1934 "SEL: Select single-step %s\n",
1935 target_pid_to_str (ptid_of (event_lp
)));
1939 /* No single-stepping LWP. Select one at random, out of those
1940 which have had SIGTRAP events. */
1942 /* First see how many SIGTRAP events we have. */
1943 find_inferior (&all_lwps
, count_events_callback
, &num_events
);
1945 /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
1946 random_selector
= (int)
1947 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
1949 if (debug_threads
&& num_events
> 1)
1951 "SEL: Found %d SIGTRAP events, selecting #%d\n",
1952 num_events
, random_selector
);
1954 event_lp
= (struct lwp_info
*) find_inferior (&all_lwps
,
1955 select_event_lwp_callback
,
1959 if (event_lp
!= NULL
)
1961 /* Switch the event LWP. */
1962 *orig_lp
= event_lp
;
1966 /* Decrement the suspend count of an LWP. */
1969 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
1971 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
1973 /* Ignore EXCEPT. */
1979 gdb_assert (lwp
->suspended
>= 0);
1983 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
1987 unsuspend_all_lwps (struct lwp_info
*except
)
1989 find_inferior (&all_lwps
, unsuspend_one_lwp
, except
);
1992 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
1993 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
1995 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
1996 static ptid_t
linux_wait_1 (ptid_t ptid
,
1997 struct target_waitstatus
*ourstatus
,
1998 int target_options
);
2000 /* Stabilize threads (move out of jump pads).
2002 If a thread is midway collecting a fast tracepoint, we need to
2003 finish the collection and move it out of the jump pad before
2004 reporting the signal.
2006 This avoids recursion while collecting (when a signal arrives
2007 midway, and the signal handler itself collects), which would trash
2008 the trace buffer. In case the user set a breakpoint in a signal
2009 handler, this avoids the backtrace showing the jump pad, etc..
2010 Most importantly, there are certain things we can't do safely if
2011 threads are stopped in a jump pad (or in its callee's). For
2014 - starting a new trace run. A thread still collecting the
2015 previous run, could trash the trace buffer when resumed. The trace
2016 buffer control structures would have been reset but the thread had
2017 no way to tell. The thread could even midway memcpy'ing to the
2018 buffer, which would mean that when resumed, it would clobber the
2019 trace buffer that had been set for a new run.
2021 - we can't rewrite/reuse the jump pads for new tracepoints
2022 safely. Say you do tstart while a thread is stopped midway while
2023 collecting. When the thread is later resumed, it finishes the
2024 collection, and returns to the jump pad, to execute the original
2025 instruction that was under the tracepoint jump at the time the
2026 older run had been started. If the jump pad had been rewritten
2027 since for something else in the new run, the thread would now
2028 execute the wrong / random instructions. */
2031 linux_stabilize_threads (void)
2033 struct thread_info
*save_inferior
;
2034 struct lwp_info
*lwp_stuck
;
2037 = (struct lwp_info
*) find_inferior (&all_lwps
,
2038 stuck_in_jump_pad_callback
, NULL
);
2039 if (lwp_stuck
!= NULL
)
2042 fprintf (stderr
, "can't stabilize, LWP %ld is stuck in jump pad\n",
2043 lwpid_of (lwp_stuck
));
2047 save_inferior
= current_inferior
;
2049 stabilizing_threads
= 1;
2052 for_each_inferior (&all_lwps
, move_out_of_jump_pad_callback
);
2054 /* Loop until all are stopped out of the jump pads. */
2055 while (find_inferior (&all_lwps
, lwp_running
, NULL
) != NULL
)
2057 struct target_waitstatus ourstatus
;
2058 struct lwp_info
*lwp
;
2061 /* Note that we go through the full wait even loop. While
2062 moving threads out of jump pad, we need to be able to step
2063 over internal breakpoints and such. */
2064 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2066 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2068 lwp
= get_thread_lwp (current_inferior
);
2073 if (ourstatus
.value
.sig
!= TARGET_SIGNAL_0
2074 || current_inferior
->last_resume_kind
== resume_stop
)
2076 wstat
= W_STOPCODE (target_signal_to_host (ourstatus
.value
.sig
));
2077 enqueue_one_deferred_signal (lwp
, &wstat
);
2082 find_inferior (&all_lwps
, unsuspend_one_lwp
, NULL
);
2084 stabilizing_threads
= 0;
2086 current_inferior
= save_inferior
;
2091 = (struct lwp_info
*) find_inferior (&all_lwps
,
2092 stuck_in_jump_pad_callback
, NULL
);
2093 if (lwp_stuck
!= NULL
)
2094 fprintf (stderr
, "couldn't stabilize, LWP %ld got stuck in jump pad\n",
2095 lwpid_of (lwp_stuck
));
2099 /* Wait for process, returns status. */
2102 linux_wait_1 (ptid_t ptid
,
2103 struct target_waitstatus
*ourstatus
, int target_options
)
2106 struct lwp_info
*event_child
;
2109 int step_over_finished
;
2110 int bp_explains_trap
;
2111 int maybe_internal_trap
;
2115 /* Translate generic target options into linux options. */
2117 if (target_options
& TARGET_WNOHANG
)
2121 bp_explains_trap
= 0;
2123 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2125 /* If we were only supposed to resume one thread, only wait for
2126 that thread - if it's still alive. If it died, however - which
2127 can happen if we're coming from the thread death case below -
2128 then we need to make sure we restart the other threads. We could
2129 pick a thread at random or restart all; restarting all is less
2132 && !ptid_equal (cont_thread
, null_ptid
)
2133 && !ptid_equal (cont_thread
, minus_one_ptid
))
2135 struct thread_info
*thread
;
2137 thread
= (struct thread_info
*) find_inferior_id (&all_threads
,
2140 /* No stepping, no signal - unless one is pending already, of course. */
2143 struct thread_resume resume_info
;
2144 resume_info
.thread
= minus_one_ptid
;
2145 resume_info
.kind
= resume_continue
;
2146 resume_info
.sig
= 0;
2147 linux_resume (&resume_info
, 1);
2153 if (ptid_equal (step_over_bkpt
, null_ptid
))
2154 pid
= linux_wait_for_event (ptid
, &w
, options
);
2158 fprintf (stderr
, "step_over_bkpt set [%s], doing a blocking wait\n",
2159 target_pid_to_str (step_over_bkpt
));
2160 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
2163 if (pid
== 0) /* only if TARGET_WNOHANG */
2166 event_child
= get_thread_lwp (current_inferior
);
2168 /* If we are waiting for a particular child, and it exited,
2169 linux_wait_for_event will return its exit status. Similarly if
2170 the last child exited. If this is not the last child, however,
2171 do not report it as exited until there is a 'thread exited' response
2172 available in the remote protocol. Instead, just wait for another event.
2173 This should be safe, because if the thread crashed we will already
2174 have reported the termination signal to GDB; that should stop any
2175 in-progress stepping operations, etc.
2177 Report the exit status of the last thread to exit. This matches
2178 LinuxThreads' behavior. */
2180 if (last_thread_of_process_p (current_inferior
))
2182 if (WIFEXITED (w
) || WIFSIGNALED (w
))
2186 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
2187 ourstatus
->value
.integer
= WEXITSTATUS (w
);
2191 "\nChild exited with retcode = %x \n",
2196 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
2197 ourstatus
->value
.sig
= target_signal_from_host (WTERMSIG (w
));
2201 "\nChild terminated with signal = %x \n",
2206 return ptid_of (event_child
);
2211 if (!WIFSTOPPED (w
))
2215 /* If this event was not handled before, and is not a SIGTRAP, we
2216 report it. SIGILL and SIGSEGV are also treated as traps in case
2217 a breakpoint is inserted at the current PC. If this target does
2218 not support internal breakpoints at all, we also report the
2219 SIGTRAP without further processing; it's of no concern to us. */
2221 = (supports_breakpoints ()
2222 && (WSTOPSIG (w
) == SIGTRAP
2223 || ((WSTOPSIG (w
) == SIGILL
2224 || WSTOPSIG (w
) == SIGSEGV
)
2225 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
2227 if (maybe_internal_trap
)
2229 /* Handle anything that requires bookkeeping before deciding to
2230 report the event or continue waiting. */
2232 /* First check if we can explain the SIGTRAP with an internal
2233 breakpoint, or if we should possibly report the event to GDB.
2234 Do this before anything that may remove or insert a
2236 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
2238 /* We have a SIGTRAP, possibly a step-over dance has just
2239 finished. If so, tweak the state machine accordingly,
2240 reinsert breakpoints and delete any reinsert (software
2241 single-step) breakpoints. */
2242 step_over_finished
= finish_step_over (event_child
);
2244 /* Now invoke the callbacks of any internal breakpoints there. */
2245 check_breakpoints (event_child
->stop_pc
);
2247 /* Handle tracepoint data collecting. This may overflow the
2248 trace buffer, and cause a tracing stop, removing
2250 trace_event
= handle_tracepoints (event_child
);
2252 if (bp_explains_trap
)
2254 /* If we stepped or ran into an internal breakpoint, we've
2255 already handled it. So next time we resume (from this
2256 PC), we should step over it. */
2258 fprintf (stderr
, "Hit a gdbserver breakpoint.\n");
2260 if (breakpoint_here (event_child
->stop_pc
))
2261 event_child
->need_step_over
= 1;
2266 /* We have some other signal, possibly a step-over dance was in
2267 progress, and it should be cancelled too. */
2268 step_over_finished
= finish_step_over (event_child
);
2271 /* We have all the data we need. Either report the event to GDB, or
2272 resume threads and keep waiting for more. */
2274 /* If we're collecting a fast tracepoint, finish the collection and
2275 move out of the jump pad before delivering a signal. See
2276 linux_stabilize_threads. */
2279 && WSTOPSIG (w
) != SIGTRAP
2280 && supports_fast_tracepoints ()
2281 && in_process_agent_loaded ())
2285 "Got signal %d for LWP %ld. Check if we need "
2286 "to defer or adjust it.\n",
2287 WSTOPSIG (w
), lwpid_of (event_child
));
2289 /* Allow debugging the jump pad itself. */
2290 if (current_inferior
->last_resume_kind
!= resume_step
2291 && maybe_move_out_of_jump_pad (event_child
, &w
))
2293 enqueue_one_deferred_signal (event_child
, &w
);
2297 "Signal %d for LWP %ld deferred (in jump pad)\n",
2298 WSTOPSIG (w
), lwpid_of (event_child
));
2300 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
2305 if (event_child
->collecting_fast_tracepoint
)
2309 LWP %ld was trying to move out of the jump pad (%d). \
2310 Check if we're already there.\n",
2311 lwpid_of (event_child
),
2312 event_child
->collecting_fast_tracepoint
);
2316 event_child
->collecting_fast_tracepoint
2317 = linux_fast_tracepoint_collecting (event_child
, NULL
);
2319 if (event_child
->collecting_fast_tracepoint
!= 1)
2321 /* No longer need this breakpoint. */
2322 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
2326 "No longer need exit-jump-pad bkpt; removing it."
2327 "stopping all threads momentarily.\n");
2329 /* Other running threads could hit this breakpoint.
2330 We don't handle moribund locations like GDB does,
2331 instead we always pause all threads when removing
2332 breakpoints, so that any step-over or
2333 decr_pc_after_break adjustment is always taken
2334 care of while the breakpoint is still
2336 stop_all_lwps (1, event_child
);
2337 cancel_breakpoints ();
2339 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
2340 event_child
->exit_jump_pad_bkpt
= NULL
;
2342 unstop_all_lwps (1, event_child
);
2344 gdb_assert (event_child
->suspended
>= 0);
2348 if (event_child
->collecting_fast_tracepoint
== 0)
2352 "fast tracepoint finished "
2353 "collecting successfully.\n");
2355 /* We may have a deferred signal to report. */
2356 if (dequeue_one_deferred_signal (event_child
, &w
))
2359 fprintf (stderr
, "dequeued one signal.\n");
2364 fprintf (stderr
, "no deferred signals.\n");
2366 if (stabilizing_threads
)
2368 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2369 ourstatus
->value
.sig
= TARGET_SIGNAL_0
;
2370 return ptid_of (event_child
);
2376 /* Check whether GDB would be interested in this event. */
2378 /* If GDB is not interested in this signal, don't stop other
2379 threads, and don't report it to GDB. Just resume the inferior
2380 right away. We do this for threading-related signals as well as
2381 any that GDB specifically requested we ignore. But never ignore
2382 SIGSTOP if we sent it ourselves, and do not ignore signals when
2383 stepping - they may require special handling to skip the signal
2385 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
2388 && current_inferior
->last_resume_kind
!= resume_step
2390 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
2391 (current_process ()->private->thread_db
!= NULL
2392 && (WSTOPSIG (w
) == __SIGRTMIN
2393 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
2396 (pass_signals
[target_signal_from_host (WSTOPSIG (w
))]
2397 && !(WSTOPSIG (w
) == SIGSTOP
2398 && current_inferior
->last_resume_kind
== resume_stop
))))
2400 siginfo_t info
, *info_p
;
2403 fprintf (stderr
, "Ignored signal %d for LWP %ld.\n",
2404 WSTOPSIG (w
), lwpid_of (event_child
));
2406 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (event_child
), 0, &info
) == 0)
2410 linux_resume_one_lwp (event_child
, event_child
->stepping
,
2411 WSTOPSIG (w
), info_p
);
2415 /* If GDB wanted this thread to single step, we always want to
2416 report the SIGTRAP, and let GDB handle it. Watchpoints should
2417 always be reported. So should signals we can't explain. A
2418 SIGTRAP we can't explain could be a GDB breakpoint --- we may or
2419 not support Z0 breakpoints. If we do, we're be able to handle
2420 GDB breakpoints on top of internal breakpoints, by handling the
2421 internal breakpoint and still reporting the event to GDB. If we
2422 don't, we're out of luck, GDB won't see the breakpoint hit. */
2423 report_to_gdb
= (!maybe_internal_trap
2424 || current_inferior
->last_resume_kind
== resume_step
2425 || event_child
->stopped_by_watchpoint
2426 || (!step_over_finished
2427 && !bp_explains_trap
&& !trace_event
)
2428 || (gdb_breakpoint_here (event_child
->stop_pc
)
2429 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)));
2431 /* We found no reason GDB would want us to stop. We either hit one
2432 of our own breakpoints, or finished an internal step GDB
2433 shouldn't know about. */
2438 if (bp_explains_trap
)
2439 fprintf (stderr
, "Hit a gdbserver breakpoint.\n");
2440 if (step_over_finished
)
2441 fprintf (stderr
, "Step-over finished.\n");
2443 fprintf (stderr
, "Tracepoint event.\n");
2446 /* We're not reporting this breakpoint to GDB, so apply the
2447 decr_pc_after_break adjustment to the inferior's regcache
2450 if (the_low_target
.set_pc
!= NULL
)
2452 struct regcache
*regcache
2453 = get_thread_regcache (get_lwp_thread (event_child
), 1);
2454 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
2457 /* We may have finished stepping over a breakpoint. If so,
2458 we've stopped and suspended all LWPs momentarily except the
2459 stepping one. This is where we resume them all again. We're
2460 going to keep waiting, so use proceed, which handles stepping
2461 over the next breakpoint. */
2463 fprintf (stderr
, "proceeding all threads.\n");
2465 if (step_over_finished
)
2466 unsuspend_all_lwps (event_child
);
2468 proceed_all_lwps ();
2474 if (current_inferior
->last_resume_kind
== resume_step
)
2475 fprintf (stderr
, "GDB wanted to single-step, reporting event.\n");
2476 if (event_child
->stopped_by_watchpoint
)
2477 fprintf (stderr
, "Stopped by watchpoint.\n");
2478 if (gdb_breakpoint_here (event_child
->stop_pc
))
2479 fprintf (stderr
, "Stopped by GDB breakpoint.\n");
2481 fprintf (stderr
, "Hit a non-gdbserver trap event.\n");
2484 /* Alright, we're going to report a stop. */
2486 if (!non_stop
&& !stabilizing_threads
)
2488 /* In all-stop, stop all threads. */
2489 stop_all_lwps (0, NULL
);
2491 /* If we're not waiting for a specific LWP, choose an event LWP
2492 from among those that have had events. Giving equal priority
2493 to all LWPs that have had events helps prevent
2495 if (ptid_equal (ptid
, minus_one_ptid
))
2497 event_child
->status_pending_p
= 1;
2498 event_child
->status_pending
= w
;
2500 select_event_lwp (&event_child
);
2502 event_child
->status_pending_p
= 0;
2503 w
= event_child
->status_pending
;
2506 /* Now that we've selected our final event LWP, cancel any
2507 breakpoints in other LWPs that have hit a GDB breakpoint.
2508 See the comment in cancel_breakpoints_callback to find out
2510 find_inferior (&all_lwps
, cancel_breakpoints_callback
, event_child
);
2512 /* If we were going a step-over, all other threads but the stepping one
2513 had been paused in start_step_over, with their suspend counts
2514 incremented. We don't want to do a full unstop/unpause, because we're
2515 in all-stop mode (so we want threads stopped), but we still need to
2516 unsuspend the other threads, to decrement their `suspended' count
2518 if (step_over_finished
)
2519 unsuspend_all_lwps (event_child
);
2521 /* Stabilize threads (move out of jump pads). */
2522 stabilize_threads ();
2526 /* If we just finished a step-over, then all threads had been
2527 momentarily paused. In all-stop, that's fine, we want
2528 threads stopped by now anyway. In non-stop, we need to
2529 re-resume threads that GDB wanted to be running. */
2530 if (step_over_finished
)
2531 unstop_all_lwps (1, event_child
);
2534 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2536 if (current_inferior
->last_resume_kind
== resume_stop
2537 && WSTOPSIG (w
) == SIGSTOP
)
2539 /* A thread that has been requested to stop by GDB with vCont;t,
2540 and it stopped cleanly, so report as SIG0. The use of
2541 SIGSTOP is an implementation detail. */
2542 ourstatus
->value
.sig
= TARGET_SIGNAL_0
;
2544 else if (current_inferior
->last_resume_kind
== resume_stop
2545 && WSTOPSIG (w
) != SIGSTOP
)
2547 /* A thread that has been requested to stop by GDB with vCont;t,
2548 but, it stopped for other reasons. */
2549 ourstatus
->value
.sig
= target_signal_from_host (WSTOPSIG (w
));
2553 ourstatus
->value
.sig
= target_signal_from_host (WSTOPSIG (w
));
2556 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
2559 fprintf (stderr
, "linux_wait ret = %s, %d, %d\n",
2560 target_pid_to_str (ptid_of (event_child
)),
2562 ourstatus
->value
.sig
);
2564 return ptid_of (event_child
);
2567 /* Get rid of any pending event in the pipe. */
2569 async_file_flush (void)
2575 ret
= read (linux_event_pipe
[0], &buf
, 1);
2576 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
2579 /* Put something in the pipe, so the event loop wakes up. */
2581 async_file_mark (void)
2585 async_file_flush ();
2588 ret
= write (linux_event_pipe
[1], "+", 1);
2589 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
2591 /* Ignore EAGAIN. If the pipe is full, the event loop will already
2592 be awakened anyway. */
2596 linux_wait (ptid_t ptid
,
2597 struct target_waitstatus
*ourstatus
, int target_options
)
2602 fprintf (stderr
, "linux_wait: [%s]\n", target_pid_to_str (ptid
));
2604 /* Flush the async file first. */
2605 if (target_is_async_p ())
2606 async_file_flush ();
2608 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
2610 /* If at least one stop was reported, there may be more. A single
2611 SIGCHLD can signal more than one child stop. */
2612 if (target_is_async_p ()
2613 && (target_options
& TARGET_WNOHANG
) != 0
2614 && !ptid_equal (event_ptid
, null_ptid
))
2620 /* Send a signal to an LWP. */
2623 kill_lwp (unsigned long lwpid
, int signo
)
2625 /* Use tkill, if possible, in case we are using nptl threads. If tkill
2626 fails, then we are not using nptl threads and we should be using kill. */
2630 static int tkill_failed
;
2637 ret
= syscall (__NR_tkill
, lwpid
, signo
);
2638 if (errno
!= ENOSYS
)
2645 return kill (lwpid
, signo
);
2649 linux_stop_lwp (struct lwp_info
*lwp
)
2655 send_sigstop (struct lwp_info
*lwp
)
2659 pid
= lwpid_of (lwp
);
2661 /* If we already have a pending stop signal for this process, don't
2663 if (lwp
->stop_expected
)
2666 fprintf (stderr
, "Have pending sigstop for lwp %d\n", pid
);
2672 fprintf (stderr
, "Sending sigstop to lwp %d\n", pid
);
2674 lwp
->stop_expected
= 1;
2675 kill_lwp (pid
, SIGSTOP
);
2679 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
2681 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2683 /* Ignore EXCEPT. */
2694 /* Increment the suspend count of an LWP, and stop it, if not stopped
2697 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
2700 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2702 /* Ignore EXCEPT. */
2708 return send_sigstop_callback (entry
, except
);
2712 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
2714 /* It's dead, really. */
2717 /* Store the exit status for later. */
2718 lwp
->status_pending_p
= 1;
2719 lwp
->status_pending
= wstat
;
2721 /* Prevent trying to stop it. */
2724 /* No further stops are expected from a dead lwp. */
2725 lwp
->stop_expected
= 0;
2729 wait_for_sigstop (struct inferior_list_entry
*entry
)
2731 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2732 struct thread_info
*saved_inferior
;
2741 fprintf (stderr
, "wait_for_sigstop: LWP %ld already stopped\n",
2746 saved_inferior
= current_inferior
;
2747 if (saved_inferior
!= NULL
)
2748 saved_tid
= ((struct inferior_list_entry
*) saved_inferior
)->id
;
2750 saved_tid
= null_ptid
; /* avoid bogus unused warning */
2752 ptid
= lwp
->head
.id
;
2755 fprintf (stderr
, "wait_for_sigstop: pulling one event\n");
2757 pid
= linux_wait_for_event (ptid
, &wstat
, __WALL
);
2759 /* If we stopped with a non-SIGSTOP signal, save it for later
2760 and record the pending SIGSTOP. If the process exited, just
2762 if (WIFSTOPPED (wstat
))
2765 fprintf (stderr
, "LWP %ld stopped with signal %d\n",
2766 lwpid_of (lwp
), WSTOPSIG (wstat
));
2768 if (WSTOPSIG (wstat
) != SIGSTOP
)
2771 fprintf (stderr
, "LWP %ld stopped with non-sigstop status %06x\n",
2772 lwpid_of (lwp
), wstat
);
2774 lwp
->status_pending_p
= 1;
2775 lwp
->status_pending
= wstat
;
2781 fprintf (stderr
, "Process %d exited while stopping LWPs\n", pid
);
2783 lwp
= find_lwp_pid (pid_to_ptid (pid
));
2786 /* Leave this status pending for the next time we're able to
2787 report it. In the mean time, we'll report this lwp as
2788 dead to GDB, so GDB doesn't try to read registers and
2789 memory from it. This can only happen if this was the
2790 last thread of the process; otherwise, PID is removed
2791 from the thread tables before linux_wait_for_event
2793 mark_lwp_dead (lwp
, wstat
);
2797 if (saved_inferior
== NULL
|| linux_thread_alive (saved_tid
))
2798 current_inferior
= saved_inferior
;
2802 fprintf (stderr
, "Previously current thread died.\n");
2806 /* We can't change the current inferior behind GDB's back,
2807 otherwise, a subsequent command may apply to the wrong
2809 current_inferior
= NULL
;
2813 /* Set a valid thread as current. */
2814 set_desired_inferior (0);
2819 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
2820 move it out, because we need to report the stop event to GDB. For
2821 example, if the user puts a breakpoint in the jump pad, it's
2822 because she wants to debug it. */
2825 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
2827 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2828 struct thread_info
*thread
= get_lwp_thread (lwp
);
2830 gdb_assert (lwp
->suspended
== 0);
2831 gdb_assert (lwp
->stopped
);
2833 /* Allow debugging the jump pad, gdb_collect, etc.. */
2834 return (supports_fast_tracepoints ()
2835 && in_process_agent_loaded ()
2836 && (gdb_breakpoint_here (lwp
->stop_pc
)
2837 || lwp
->stopped_by_watchpoint
2838 || thread
->last_resume_kind
== resume_step
)
2839 && linux_fast_tracepoint_collecting (lwp
, NULL
));
2843 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
2845 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2846 struct thread_info
*thread
= get_lwp_thread (lwp
);
2849 gdb_assert (lwp
->suspended
== 0);
2850 gdb_assert (lwp
->stopped
);
2852 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
2854 /* Allow debugging the jump pad, gdb_collect, etc. */
2855 if (!gdb_breakpoint_here (lwp
->stop_pc
)
2856 && !lwp
->stopped_by_watchpoint
2857 && thread
->last_resume_kind
!= resume_step
2858 && maybe_move_out_of_jump_pad (lwp
, wstat
))
2862 "LWP %ld needs stabilizing (in jump pad)\n",
2867 lwp
->status_pending_p
= 0;
2868 enqueue_one_deferred_signal (lwp
, wstat
);
2872 "Signal %d for LWP %ld deferred "
2874 WSTOPSIG (*wstat
), lwpid_of (lwp
));
2877 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
2884 lwp_running (struct inferior_list_entry
*entry
, void *data
)
2886 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2895 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
2896 If SUSPEND, then also increase the suspend count of every LWP,
2900 stop_all_lwps (int suspend
, struct lwp_info
*except
)
2902 stopping_threads
= 1;
2905 find_inferior (&all_lwps
, suspend_and_send_sigstop_callback
, except
);
2907 find_inferior (&all_lwps
, send_sigstop_callback
, except
);
2908 for_each_inferior (&all_lwps
, wait_for_sigstop
);
2909 stopping_threads
= 0;
2912 /* Resume execution of the inferior process.
2913 If STEP is nonzero, single-step it.
2914 If SIGNAL is nonzero, give it that signal. */
2917 linux_resume_one_lwp (struct lwp_info
*lwp
,
2918 int step
, int signal
, siginfo_t
*info
)
2920 struct thread_info
*saved_inferior
;
2921 int fast_tp_collecting
;
2923 if (lwp
->stopped
== 0)
2926 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
2928 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
2930 /* Cancel actions that rely on GDB not changing the PC (e.g., the
2931 user used the "jump" command, or "set $pc = foo"). */
2932 if (lwp
->stop_pc
!= get_pc (lwp
))
2934 /* Collecting 'while-stepping' actions doesn't make sense
2936 release_while_stepping_state_list (get_lwp_thread (lwp
));
2939 /* If we have pending signals or status, and a new signal, enqueue the
2940 signal. Also enqueue the signal if we are waiting to reinsert a
2941 breakpoint; it will be picked up again below. */
2943 && (lwp
->status_pending_p
2944 || lwp
->pending_signals
!= NULL
2945 || lwp
->bp_reinsert
!= 0
2946 || fast_tp_collecting
))
2948 struct pending_signals
*p_sig
;
2949 p_sig
= xmalloc (sizeof (*p_sig
));
2950 p_sig
->prev
= lwp
->pending_signals
;
2951 p_sig
->signal
= signal
;
2953 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
2955 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
2956 lwp
->pending_signals
= p_sig
;
2959 if (lwp
->status_pending_p
)
2962 fprintf (stderr
, "Not resuming lwp %ld (%s, signal %d, stop %s);"
2963 " has pending status\n",
2964 lwpid_of (lwp
), step
? "step" : "continue", signal
,
2965 lwp
->stop_expected
? "expected" : "not expected");
2969 saved_inferior
= current_inferior
;
2970 current_inferior
= get_lwp_thread (lwp
);
2973 fprintf (stderr
, "Resuming lwp %ld (%s, signal %d, stop %s)\n",
2974 lwpid_of (lwp
), step
? "step" : "continue", signal
,
2975 lwp
->stop_expected
? "expected" : "not expected");
2977 /* This bit needs some thinking about. If we get a signal that
2978 we must report while a single-step reinsert is still pending,
2979 we often end up resuming the thread. It might be better to
2980 (ew) allow a stack of pending events; then we could be sure that
2981 the reinsert happened right away and not lose any signals.
2983 Making this stack would also shrink the window in which breakpoints are
2984 uninserted (see comment in linux_wait_for_lwp) but not enough for
2985 complete correctness, so it won't solve that problem. It may be
2986 worthwhile just to solve this one, however. */
2987 if (lwp
->bp_reinsert
!= 0)
2990 fprintf (stderr
, " pending reinsert at 0x%s\n",
2991 paddress (lwp
->bp_reinsert
));
2993 if (lwp
->bp_reinsert
!= 0 && can_hardware_single_step ())
2995 if (fast_tp_collecting
== 0)
2998 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
3000 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
3007 /* Postpone any pending signal. It was enqueued above. */
3011 if (fast_tp_collecting
== 1)
3015 lwp %ld wants to get out of fast tracepoint jump pad (exit-jump-pad-bkpt)\n",
3018 /* Postpone any pending signal. It was enqueued above. */
3021 else if (fast_tp_collecting
== 2)
3025 lwp %ld wants to get out of fast tracepoint jump pad single-stepping\n",
3028 if (can_hardware_single_step ())
3031 fatal ("moving out of jump pad single-stepping"
3032 " not implemented on this target");
3034 /* Postpone any pending signal. It was enqueued above. */
3038 /* If we have while-stepping actions in this thread set it stepping.
3039 If we have a signal to deliver, it may or may not be set to
3040 SIG_IGN, we don't know. Assume so, and allow collecting
3041 while-stepping into a signal handler. A possible smart thing to
3042 do would be to set an internal breakpoint at the signal return
3043 address, continue, and carry on catching this while-stepping
3044 action only when that breakpoint is hit. A future
3046 if (get_lwp_thread (lwp
)->while_stepping
!= NULL
3047 && can_hardware_single_step ())
3051 "lwp %ld has a while-stepping action -> forcing step.\n",
3056 if (debug_threads
&& the_low_target
.get_pc
!= NULL
)
3058 struct regcache
*regcache
= get_thread_regcache (current_inferior
, 1);
3059 CORE_ADDR pc
= (*the_low_target
.get_pc
) (regcache
);
3060 fprintf (stderr
, " resuming from pc 0x%lx\n", (long) pc
);
3063 /* If we have pending signals, consume one unless we are trying to
3064 reinsert a breakpoint or we're trying to finish a fast tracepoint
3066 if (lwp
->pending_signals
!= NULL
3067 && lwp
->bp_reinsert
== 0
3068 && fast_tp_collecting
== 0)
3070 struct pending_signals
**p_sig
;
3072 p_sig
= &lwp
->pending_signals
;
3073 while ((*p_sig
)->prev
!= NULL
)
3074 p_sig
= &(*p_sig
)->prev
;
3076 signal
= (*p_sig
)->signal
;
3077 if ((*p_sig
)->info
.si_signo
!= 0)
3078 ptrace (PTRACE_SETSIGINFO
, lwpid_of (lwp
), 0, &(*p_sig
)->info
);
3084 if (the_low_target
.prepare_to_resume
!= NULL
)
3085 the_low_target
.prepare_to_resume (lwp
);
3087 regcache_invalidate_one ((struct inferior_list_entry
*)
3088 get_lwp_thread (lwp
));
3091 lwp
->stopped_by_watchpoint
= 0;
3092 lwp
->stepping
= step
;
3093 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (lwp
), 0,
3094 /* Coerce to a uintptr_t first to avoid potential gcc warning
3095 of coercing an 8 byte integer to a 4 byte pointer. */
3096 (PTRACE_ARG4_TYPE
) (uintptr_t) signal
);
3098 current_inferior
= saved_inferior
;
3101 /* ESRCH from ptrace either means that the thread was already
3102 running (an error) or that it is gone (a race condition). If
3103 it's gone, we will get a notification the next time we wait,
3104 so we can ignore the error. We could differentiate these
3105 two, but it's tricky without waiting; the thread still exists
3106 as a zombie, so sending it signal 0 would succeed. So just
3111 perror_with_name ("ptrace");
3115 struct thread_resume_array
3117 struct thread_resume
*resume
;
3121 /* This function is called once per thread. We look up the thread
3122 in RESUME_PTR, and mark the thread with a pointer to the appropriate
3125 This algorithm is O(threads * resume elements), but resume elements
3126 is small (and will remain small at least until GDB supports thread
3129 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
3131 struct lwp_info
*lwp
;
3132 struct thread_info
*thread
;
3134 struct thread_resume_array
*r
;
3136 thread
= (struct thread_info
*) entry
;
3137 lwp
= get_thread_lwp (thread
);
3140 for (ndx
= 0; ndx
< r
->n
; ndx
++)
3142 ptid_t ptid
= r
->resume
[ndx
].thread
;
3143 if (ptid_equal (ptid
, minus_one_ptid
)
3144 || ptid_equal (ptid
, entry
->id
)
3145 || (ptid_is_pid (ptid
)
3146 && (ptid_get_pid (ptid
) == pid_of (lwp
)))
3147 || (ptid_get_lwp (ptid
) == -1
3148 && (ptid_get_pid (ptid
) == pid_of (lwp
))))
3150 if (r
->resume
[ndx
].kind
== resume_stop
3151 && thread
->last_resume_kind
== resume_stop
)
3154 fprintf (stderr
, "already %s LWP %ld at GDB's request\n",
3155 thread
->last_status
.kind
== TARGET_WAITKIND_STOPPED
3163 lwp
->resume
= &r
->resume
[ndx
];
3164 thread
->last_resume_kind
= lwp
->resume
->kind
;
3166 /* If we had a deferred signal to report, dequeue one now.
3167 This can happen if LWP gets more than one signal while
3168 trying to get out of a jump pad. */
3170 && !lwp
->status_pending_p
3171 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
3173 lwp
->status_pending_p
= 1;
3177 "Dequeueing deferred signal %d for LWP %ld, "
3178 "leaving status pending.\n",
3179 WSTOPSIG (lwp
->status_pending
), lwpid_of (lwp
));
3186 /* No resume action for this thread. */
3193 /* Set *FLAG_P if this lwp has an interesting status pending. */
3195 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
3197 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3199 /* LWPs which will not be resumed are not interesting, because
3200 we might not wait for them next time through linux_wait. */
3201 if (lwp
->resume
== NULL
)
3204 if (lwp
->status_pending_p
)
3205 * (int *) flag_p
= 1;
3210 /* Return 1 if this lwp that GDB wants running is stopped at an
3211 internal breakpoint that we need to step over. It assumes that any
3212 required STOP_PC adjustment has already been propagated to the
3213 inferior's regcache. */
3216 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
3218 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3219 struct thread_info
*thread
;
3220 struct thread_info
*saved_inferior
;
3223 /* LWPs which will not be resumed are not interesting, because we
3224 might not wait for them next time through linux_wait. */
3230 "Need step over [LWP %ld]? Ignoring, not stopped\n",
3235 thread
= get_lwp_thread (lwp
);
3237 if (thread
->last_resume_kind
== resume_stop
)
3241 "Need step over [LWP %ld]? Ignoring, should remain stopped\n",
3246 gdb_assert (lwp
->suspended
>= 0);
3252 "Need step over [LWP %ld]? Ignoring, suspended\n",
3257 if (!lwp
->need_step_over
)
3261 "Need step over [LWP %ld]? No\n", lwpid_of (lwp
));
3264 if (lwp
->status_pending_p
)
3268 "Need step over [LWP %ld]? Ignoring, has pending status.\n",
3273 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
3277 /* If the PC has changed since we stopped, then don't do anything,
3278 and let the breakpoint/tracepoint be hit. This happens if, for
3279 instance, GDB handled the decr_pc_after_break subtraction itself,
3280 GDB is OOL stepping this thread, or the user has issued a "jump"
3281 command, or poked thread's registers herself. */
3282 if (pc
!= lwp
->stop_pc
)
3286 "Need step over [LWP %ld]? Cancelling, PC was changed. "
3287 "Old stop_pc was 0x%s, PC is now 0x%s\n",
3288 lwpid_of (lwp
), paddress (lwp
->stop_pc
), paddress (pc
));
3290 lwp
->need_step_over
= 0;
3294 saved_inferior
= current_inferior
;
3295 current_inferior
= thread
;
3297 /* We can only step over breakpoints we know about. */
3298 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
3300 /* Don't step over a breakpoint that GDB expects to hit
3301 though. If the condition is being evaluated on the target's side
3302 and it evaluate to false, step over this breakpoint as well. */
3303 if (gdb_breakpoint_here (pc
)
3304 && gdb_condition_true_at_breakpoint (pc
))
3308 "Need step over [LWP %ld]? yes, but found"
3309 " GDB breakpoint at 0x%s; skipping step over\n",
3310 lwpid_of (lwp
), paddress (pc
));
3312 current_inferior
= saved_inferior
;
3319 "Need step over [LWP %ld]? yes, "
3320 "found breakpoint at 0x%s\n",
3321 lwpid_of (lwp
), paddress (pc
));
3323 /* We've found an lwp that needs stepping over --- return 1 so
3324 that find_inferior stops looking. */
3325 current_inferior
= saved_inferior
;
3327 /* If the step over is cancelled, this is set again. */
3328 lwp
->need_step_over
= 0;
3333 current_inferior
= saved_inferior
;
3337 "Need step over [LWP %ld]? No, no breakpoint found at 0x%s\n",
3338 lwpid_of (lwp
), paddress (pc
));
3343 /* Start a step-over operation on LWP. When LWP stopped at a
3344 breakpoint, to make progress, we need to remove the breakpoint out
3345 of the way. If we let other threads run while we do that, they may
3346 pass by the breakpoint location and miss hitting it. To avoid
3347 that, a step-over momentarily stops all threads while LWP is
3348 single-stepped while the breakpoint is temporarily uninserted from
3349 the inferior. When the single-step finishes, we reinsert the
3350 breakpoint, and let all threads that are supposed to be running,
3353 On targets that don't support hardware single-step, we don't
3354 currently support full software single-stepping. Instead, we only
3355 support stepping over the thread event breakpoint, by asking the
3356 low target where to place a reinsert breakpoint. Since this
3357 routine assumes the breakpoint being stepped over is a thread event
3358 breakpoint, it usually assumes the return address of the current
3359 function is a good enough place to set the reinsert breakpoint. */
3362 start_step_over (struct lwp_info
*lwp
)
3364 struct thread_info
*saved_inferior
;
3370 "Starting step-over on LWP %ld. Stopping all threads\n",
3373 stop_all_lwps (1, lwp
);
3374 gdb_assert (lwp
->suspended
== 0);
3377 fprintf (stderr
, "Done stopping all threads for step-over.\n");
3379 /* Note, we should always reach here with an already adjusted PC,
3380 either by GDB (if we're resuming due to GDB's request), or by our
3381 caller, if we just finished handling an internal breakpoint GDB
3382 shouldn't care about. */
3385 saved_inferior
= current_inferior
;
3386 current_inferior
= get_lwp_thread (lwp
);
3388 lwp
->bp_reinsert
= pc
;
3389 uninsert_breakpoints_at (pc
);
3390 uninsert_fast_tracepoint_jumps_at (pc
);
3392 if (can_hardware_single_step ())
3398 CORE_ADDR raddr
= (*the_low_target
.breakpoint_reinsert_addr
) ();
3399 set_reinsert_breakpoint (raddr
);
3403 current_inferior
= saved_inferior
;
3405 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
3407 /* Require next event from this LWP. */
3408 step_over_bkpt
= lwp
->head
.id
;
3412 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
3413 start_step_over, if still there, and delete any reinsert
3414 breakpoints we've set, on non hardware single-step targets. */
3417 finish_step_over (struct lwp_info
*lwp
)
3419 if (lwp
->bp_reinsert
!= 0)
3422 fprintf (stderr
, "Finished step over.\n");
3424 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
3425 may be no breakpoint to reinsert there by now. */
3426 reinsert_breakpoints_at (lwp
->bp_reinsert
);
3427 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
3429 lwp
->bp_reinsert
= 0;
3431 /* Delete any software-single-step reinsert breakpoints. No
3432 longer needed. We don't have to worry about other threads
3433 hitting this trap, and later not being able to explain it,
3434 because we were stepping over a breakpoint, and we hold all
3435 threads but LWP stopped while doing that. */
3436 if (!can_hardware_single_step ())
3437 delete_reinsert_breakpoints ();
3439 step_over_bkpt
= null_ptid
;
3446 /* This function is called once per thread. We check the thread's resume
3447 request, which will tell us whether to resume, step, or leave the thread
3448 stopped; and what signal, if any, it should be sent.
3450 For threads which we aren't explicitly told otherwise, we preserve
3451 the stepping flag; this is used for stepping over gdbserver-placed
3454 If pending_flags was set in any thread, we queue any needed
3455 signals, since we won't actually resume. We already have a pending
3456 event to report, so we don't need to preserve any step requests;
3457 they should be re-issued if necessary. */
3460 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
3462 struct lwp_info
*lwp
;
3463 struct thread_info
*thread
;
3465 int leave_all_stopped
= * (int *) arg
;
3468 thread
= (struct thread_info
*) entry
;
3469 lwp
= get_thread_lwp (thread
);
3471 if (lwp
->resume
== NULL
)
3474 if (lwp
->resume
->kind
== resume_stop
)
3477 fprintf (stderr
, "resume_stop request for LWP %ld\n", lwpid_of (lwp
));
3482 fprintf (stderr
, "stopping LWP %ld\n", lwpid_of (lwp
));
3484 /* Stop the thread, and wait for the event asynchronously,
3485 through the event loop. */
3491 fprintf (stderr
, "already stopped LWP %ld\n",
3494 /* The LWP may have been stopped in an internal event that
3495 was not meant to be notified back to GDB (e.g., gdbserver
3496 breakpoint), so we should be reporting a stop event in
3499 /* If the thread already has a pending SIGSTOP, this is a
3500 no-op. Otherwise, something later will presumably resume
3501 the thread and this will cause it to cancel any pending
3502 operation, due to last_resume_kind == resume_stop. If
3503 the thread already has a pending status to report, we
3504 will still report it the next time we wait - see
3505 status_pending_p_callback. */
3507 /* If we already have a pending signal to report, then
3508 there's no need to queue a SIGSTOP, as this means we're
3509 midway through moving the LWP out of the jumppad, and we
3510 will report the pending signal as soon as that is
3512 if (lwp
->pending_signals_to_report
== NULL
)
3516 /* For stop requests, we're done. */
3518 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3522 /* If this thread which is about to be resumed has a pending status,
3523 then don't resume any threads - we can just report the pending
3524 status. Make sure to queue any signals that would otherwise be
3525 sent. In all-stop mode, we do this decision based on if *any*
3526 thread has a pending status. If there's a thread that needs the
3527 step-over-breakpoint dance, then don't resume any other thread
3528 but that particular one. */
3529 leave_pending
= (lwp
->status_pending_p
|| leave_all_stopped
);
3534 fprintf (stderr
, "resuming LWP %ld\n", lwpid_of (lwp
));
3536 step
= (lwp
->resume
->kind
== resume_step
);
3537 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
3542 fprintf (stderr
, "leaving LWP %ld stopped\n", lwpid_of (lwp
));
3544 /* If we have a new signal, enqueue the signal. */
3545 if (lwp
->resume
->sig
!= 0)
3547 struct pending_signals
*p_sig
;
3548 p_sig
= xmalloc (sizeof (*p_sig
));
3549 p_sig
->prev
= lwp
->pending_signals
;
3550 p_sig
->signal
= lwp
->resume
->sig
;
3551 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3553 /* If this is the same signal we were previously stopped by,
3554 make sure to queue its siginfo. We can ignore the return
3555 value of ptrace; if it fails, we'll skip
3556 PTRACE_SETSIGINFO. */
3557 if (WIFSTOPPED (lwp
->last_status
)
3558 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
3559 ptrace (PTRACE_GETSIGINFO
, lwpid_of (lwp
), 0, &p_sig
->info
);
3561 lwp
->pending_signals
= p_sig
;
3565 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3571 linux_resume (struct thread_resume
*resume_info
, size_t n
)
3573 struct thread_resume_array array
= { resume_info
, n
};
3574 struct lwp_info
*need_step_over
= NULL
;
3576 int leave_all_stopped
;
3578 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
3580 /* If there is a thread which would otherwise be resumed, which has
3581 a pending status, then don't resume any threads - we can just
3582 report the pending status. Make sure to queue any signals that
3583 would otherwise be sent. In non-stop mode, we'll apply this
3584 logic to each thread individually. We consume all pending events
3585 before considering to start a step-over (in all-stop). */
3588 find_inferior (&all_lwps
, resume_status_pending_p
, &any_pending
);
3590 /* If there is a thread which would otherwise be resumed, which is
3591 stopped at a breakpoint that needs stepping over, then don't
3592 resume any threads - have it step over the breakpoint with all
3593 other threads stopped, then resume all threads again. Make sure
3594 to queue any signals that would otherwise be delivered or
3596 if (!any_pending
&& supports_breakpoints ())
3598 = (struct lwp_info
*) find_inferior (&all_lwps
,
3599 need_step_over_p
, NULL
);
3601 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
3605 if (need_step_over
!= NULL
)
3606 fprintf (stderr
, "Not resuming all, need step over\n");
3607 else if (any_pending
)
3609 "Not resuming, all-stop and found "
3610 "an LWP with pending status\n");
3612 fprintf (stderr
, "Resuming, no pending status or step over needed\n");
3615 /* Even if we're leaving threads stopped, queue all signals we'd
3616 otherwise deliver. */
3617 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
3620 start_step_over (need_step_over
);
3623 /* This function is called once per thread. We check the thread's
3624 last resume request, which will tell us whether to resume, step, or
3625 leave the thread stopped. Any signal the client requested to be
3626 delivered has already been enqueued at this point.
3628 If any thread that GDB wants running is stopped at an internal
3629 breakpoint that needs stepping over, we start a step-over operation
3630 on that particular thread, and leave all others stopped. */
3633 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
3635 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3636 struct thread_info
*thread
;
3644 "proceed_one_lwp: lwp %ld\n", lwpid_of (lwp
));
3649 fprintf (stderr
, " LWP %ld already running\n", lwpid_of (lwp
));
3653 thread
= get_lwp_thread (lwp
);
3655 if (thread
->last_resume_kind
== resume_stop
3656 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
3659 fprintf (stderr
, " client wants LWP to remain %ld stopped\n",
3664 if (lwp
->status_pending_p
)
3667 fprintf (stderr
, " LWP %ld has pending status, leaving stopped\n",
3672 gdb_assert (lwp
->suspended
>= 0);
3677 fprintf (stderr
, " LWP %ld is suspended\n", lwpid_of (lwp
));
3681 if (thread
->last_resume_kind
== resume_stop
3682 && lwp
->pending_signals_to_report
== NULL
3683 && lwp
->collecting_fast_tracepoint
== 0)
3685 /* We haven't reported this LWP as stopped yet (otherwise, the
3686 last_status.kind check above would catch it, and we wouldn't
3687 reach here. This LWP may have been momentarily paused by a
3688 stop_all_lwps call while handling for example, another LWP's
3689 step-over. In that case, the pending expected SIGSTOP signal
3690 that was queued at vCont;t handling time will have already
3691 been consumed by wait_for_sigstop, and so we need to requeue
3692 another one here. Note that if the LWP already has a SIGSTOP
3693 pending, this is a no-op. */
3697 "Client wants LWP %ld to stop. "
3698 "Making sure it has a SIGSTOP pending\n",
3704 step
= thread
->last_resume_kind
== resume_step
;
3705 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
3710 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
3712 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3718 gdb_assert (lwp
->suspended
>= 0);
3720 return proceed_one_lwp (entry
, except
);
3723 /* When we finish a step-over, set threads running again. If there's
3724 another thread that may need a step-over, now's the time to start
3725 it. Eventually, we'll move all threads past their breakpoints. */
3728 proceed_all_lwps (void)
3730 struct lwp_info
*need_step_over
;
3732 /* If there is a thread which would otherwise be resumed, which is
3733 stopped at a breakpoint that needs stepping over, then don't
3734 resume any threads - have it step over the breakpoint with all
3735 other threads stopped, then resume all threads again. */
3737 if (supports_breakpoints ())
3740 = (struct lwp_info
*) find_inferior (&all_lwps
,
3741 need_step_over_p
, NULL
);
3743 if (need_step_over
!= NULL
)
3746 fprintf (stderr
, "proceed_all_lwps: found "
3747 "thread %ld needing a step-over\n",
3748 lwpid_of (need_step_over
));
3750 start_step_over (need_step_over
);
3756 fprintf (stderr
, "Proceeding, no step-over needed\n");
3758 find_inferior (&all_lwps
, proceed_one_lwp
, NULL
);
3761 /* Stopped LWPs that the client wanted to be running, that don't have
3762 pending statuses, are set to run again, except for EXCEPT, if not
3763 NULL. This undoes a stop_all_lwps call. */
3766 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
3772 "unstopping all lwps, except=(LWP %ld)\n", lwpid_of (except
));
3775 "unstopping all lwps\n");
3779 find_inferior (&all_lwps
, unsuspend_and_proceed_one_lwp
, except
);
3781 find_inferior (&all_lwps
, proceed_one_lwp
, except
);
3785 #ifdef HAVE_LINUX_REGSETS
3787 #define use_linux_regsets 1
3790 regsets_fetch_inferior_registers (struct regcache
*regcache
)
3792 struct regset_info
*regset
;
3793 int saw_general_regs
= 0;
3797 regset
= target_regsets
;
3799 pid
= lwpid_of (get_thread_lwp (current_inferior
));
3800 while (regset
->size
>= 0)
3805 if (regset
->size
== 0 || disabled_regsets
[regset
- target_regsets
])
3811 buf
= xmalloc (regset
->size
);
3813 nt_type
= regset
->nt_type
;
3817 iov
.iov_len
= regset
->size
;
3818 data
= (void *) &iov
;
3824 res
= ptrace (regset
->get_request
, pid
, nt_type
, data
);
3826 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
3832 /* If we get EIO on a regset, do not try it again for
3834 disabled_regsets
[regset
- target_regsets
] = 1;
3841 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
3846 else if (regset
->type
== GENERAL_REGS
)
3847 saw_general_regs
= 1;
3848 regset
->store_function (regcache
, buf
);
3852 if (saw_general_regs
)
3859 regsets_store_inferior_registers (struct regcache
*regcache
)
3861 struct regset_info
*regset
;
3862 int saw_general_regs
= 0;
3866 regset
= target_regsets
;
3868 pid
= lwpid_of (get_thread_lwp (current_inferior
));
3869 while (regset
->size
>= 0)
3874 if (regset
->size
== 0 || disabled_regsets
[regset
- target_regsets
])
3880 buf
= xmalloc (regset
->size
);
3882 /* First fill the buffer with the current register set contents,
3883 in case there are any items in the kernel's regset that are
3884 not in gdbserver's regcache. */
3886 nt_type
= regset
->nt_type
;
3890 iov
.iov_len
= regset
->size
;
3891 data
= (void *) &iov
;
3897 res
= ptrace (regset
->get_request
, pid
, nt_type
, data
);
3899 res
= ptrace (regset
->get_request
, pid
, &iov
, data
);
3904 /* Then overlay our cached registers on that. */
3905 regset
->fill_function (regcache
, buf
);
3907 /* Only now do we write the register set. */
3909 res
= ptrace (regset
->set_request
, pid
, nt_type
, data
);
3911 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
3919 /* If we get EIO on a regset, do not try it again for
3921 disabled_regsets
[regset
- target_regsets
] = 1;
3925 else if (errno
== ESRCH
)
3927 /* At this point, ESRCH should mean the process is
3928 already gone, in which case we simply ignore attempts
3929 to change its registers. See also the related
3930 comment in linux_resume_one_lwp. */
3936 perror ("Warning: ptrace(regsets_store_inferior_registers)");
3939 else if (regset
->type
== GENERAL_REGS
)
3940 saw_general_regs
= 1;
3944 if (saw_general_regs
)
3950 #else /* !HAVE_LINUX_REGSETS */
3952 #define use_linux_regsets 0
3953 #define regsets_fetch_inferior_registers(regcache) 1
3954 #define regsets_store_inferior_registers(regcache) 1
3958 /* Return 1 if register REGNO is supported by one of the regset ptrace
3959 calls or 0 if it has to be transferred individually. */
3962 linux_register_in_regsets (int regno
)
3964 unsigned char mask
= 1 << (regno
% 8);
3965 size_t index
= regno
/ 8;
3967 return (use_linux_regsets
3968 && (the_low_target
.regset_bitmap
== NULL
3969 || (the_low_target
.regset_bitmap
[index
] & mask
) != 0));
3972 #ifdef HAVE_LINUX_USRREGS
3975 register_addr (int regnum
)
3979 if (regnum
< 0 || regnum
>= the_low_target
.num_regs
)
3980 error ("Invalid register number %d.", regnum
);
3982 addr
= the_low_target
.regmap
[regnum
];
3987 /* Fetch one register. */
3989 fetch_register (struct regcache
*regcache
, int regno
)
3996 if (regno
>= the_low_target
.num_regs
)
3998 if ((*the_low_target
.cannot_fetch_register
) (regno
))
4001 regaddr
= register_addr (regno
);
4005 size
= ((register_size (regno
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4006 & -sizeof (PTRACE_XFER_TYPE
));
4007 buf
= alloca (size
);
4009 pid
= lwpid_of (get_thread_lwp (current_inferior
));
4010 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4013 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
4014 ptrace (PTRACE_PEEKUSER
, pid
,
4015 /* Coerce to a uintptr_t first to avoid potential gcc warning
4016 of coercing an 8 byte integer to a 4 byte pointer. */
4017 (PTRACE_ARG3_TYPE
) (uintptr_t) regaddr
, 0);
4018 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4020 error ("reading register %d: %s", regno
, strerror (errno
));
4023 if (the_low_target
.supply_ptrace_register
)
4024 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
4026 supply_register (regcache
, regno
, buf
);
4029 /* Store one register. */
4031 store_register (struct regcache
*regcache
, int regno
)
4038 if (regno
>= the_low_target
.num_regs
)
4040 if ((*the_low_target
.cannot_store_register
) (regno
))
4043 regaddr
= register_addr (regno
);
4047 size
= ((register_size (regno
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4048 & -sizeof (PTRACE_XFER_TYPE
));
4049 buf
= alloca (size
);
4050 memset (buf
, 0, size
);
4052 if (the_low_target
.collect_ptrace_register
)
4053 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
4055 collect_register (regcache
, regno
, buf
);
4057 pid
= lwpid_of (get_thread_lwp (current_inferior
));
4058 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4061 ptrace (PTRACE_POKEUSER
, pid
,
4062 /* Coerce to a uintptr_t first to avoid potential gcc warning
4063 about coercing an 8 byte integer to a 4 byte pointer. */
4064 (PTRACE_ARG3_TYPE
) (uintptr_t) regaddr
,
4065 (PTRACE_ARG4_TYPE
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
4068 /* At this point, ESRCH should mean the process is
4069 already gone, in which case we simply ignore attempts
4070 to change its registers. See also the related
4071 comment in linux_resume_one_lwp. */
4075 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
4076 error ("writing register %d: %s", regno
, strerror (errno
));
4078 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4082 /* Fetch all registers, or just one, from the child process.
4083 If REGNO is -1, do this for all registers, skipping any that are
4084 assumed to have been retrieved by regsets_fetch_inferior_registers,
4085 unless ALL is non-zero.
4086 Otherwise, REGNO specifies which register (so we can save time). */
4088 usr_fetch_inferior_registers (struct regcache
*regcache
, int regno
, int all
)
4092 for (regno
= 0; regno
< the_low_target
.num_regs
; regno
++)
4093 if (all
|| !linux_register_in_regsets (regno
))
4094 fetch_register (regcache
, regno
);
4097 fetch_register (regcache
, regno
);
4100 /* Store our register values back into the inferior.
4101 If REGNO is -1, do this for all registers, skipping any that are
4102 assumed to have been saved by regsets_store_inferior_registers,
4103 unless ALL is non-zero.
4104 Otherwise, REGNO specifies which register (so we can save time). */
4106 usr_store_inferior_registers (struct regcache
*regcache
, int regno
, int all
)
4110 for (regno
= 0; regno
< the_low_target
.num_regs
; regno
++)
4111 if (all
|| !linux_register_in_regsets (regno
))
4112 store_register (regcache
, regno
);
4115 store_register (regcache
, regno
);
4118 #else /* !HAVE_LINUX_USRREGS */
4120 #define usr_fetch_inferior_registers(regcache, regno, all) do {} while (0)
4121 #define usr_store_inferior_registers(regcache, regno, all) do {} while (0)
4127 linux_fetch_registers (struct regcache
*regcache
, int regno
)
4134 all
= regsets_fetch_inferior_registers (regcache
);
4135 usr_fetch_inferior_registers (regcache
, regno
, all
);
4139 use_regsets
= linux_register_in_regsets (regno
);
4141 all
= regsets_fetch_inferior_registers (regcache
);
4142 if (!use_regsets
|| all
)
4143 usr_fetch_inferior_registers (regcache
, regno
, 1);
4148 linux_store_registers (struct regcache
*regcache
, int regno
)
4155 all
= regsets_store_inferior_registers (regcache
);
4156 usr_store_inferior_registers (regcache
, regno
, all
);
4160 use_regsets
= linux_register_in_regsets (regno
);
4162 all
= regsets_store_inferior_registers (regcache
);
4163 if (!use_regsets
|| all
)
4164 usr_store_inferior_registers (regcache
, regno
, 1);
4169 /* Copy LEN bytes from inferior's memory starting at MEMADDR
4170 to debugger memory starting at MYADDR. */
4173 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
4176 /* Round starting address down to longword boundary. */
4177 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4178 /* Round ending address up; get number of longwords that makes. */
4180 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4181 / sizeof (PTRACE_XFER_TYPE
);
4182 /* Allocate buffer of that many longwords. */
4183 register PTRACE_XFER_TYPE
*buffer
4184 = (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4187 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4189 /* Try using /proc. Don't bother for one word. */
4190 if (len
>= 3 * sizeof (long))
4192 /* We could keep this file open and cache it - possibly one per
4193 thread. That requires some juggling, but is even faster. */
4194 sprintf (filename
, "/proc/%d/mem", pid
);
4195 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4199 /* If pread64 is available, use it. It's faster if the kernel
4200 supports it (only one syscall), and it's 64-bit safe even on
4201 32-bit platforms (for instance, SPARC debugging a SPARC64
4204 if (pread64 (fd
, myaddr
, len
, memaddr
) != len
)
4206 if (lseek (fd
, memaddr
, SEEK_SET
) == -1 || read (fd
, myaddr
, len
) != len
)
4218 /* Read all the longwords */
4219 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4222 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4223 about coercing an 8 byte integer to a 4 byte pointer. */
4224 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
4225 (PTRACE_ARG3_TYPE
) (uintptr_t) addr
, 0);
4230 /* Copy appropriate bytes out of the buffer. */
4232 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4238 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
4239 memory at MEMADDR. On failure (cannot write to the inferior)
4240 returns the value of errno. */
4243 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
4246 /* Round starting address down to longword boundary. */
4247 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4248 /* Round ending address up; get number of longwords that makes. */
4250 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4251 / sizeof (PTRACE_XFER_TYPE
);
4253 /* Allocate buffer of that many longwords. */
4254 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*)
4255 alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4257 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4261 /* Dump up to four bytes. */
4262 unsigned int val
= * (unsigned int *) myaddr
;
4268 val
= val
& 0xffffff;
4269 fprintf (stderr
, "Writing %0*x to 0x%08lx\n", 2 * ((len
< 4) ? len
: 4),
4270 val
, (long)memaddr
);
4273 /* Fill start and end extra bytes of buffer with existing memory data. */
4276 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4277 about coercing an 8 byte integer to a 4 byte pointer. */
4278 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
4279 (PTRACE_ARG3_TYPE
) (uintptr_t) addr
, 0);
4287 = ptrace (PTRACE_PEEKTEXT
, pid
,
4288 /* Coerce to a uintptr_t first to avoid potential gcc warning
4289 about coercing an 8 byte integer to a 4 byte pointer. */
4290 (PTRACE_ARG3_TYPE
) (uintptr_t) (addr
+ (count
- 1)
4291 * sizeof (PTRACE_XFER_TYPE
)),
4297 /* Copy data to be written over corresponding part of buffer. */
4299 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4302 /* Write the entire buffer. */
4304 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4307 ptrace (PTRACE_POKETEXT
, pid
,
4308 /* Coerce to a uintptr_t first to avoid potential gcc warning
4309 about coercing an 8 byte integer to a 4 byte pointer. */
4310 (PTRACE_ARG3_TYPE
) (uintptr_t) addr
,
4311 (PTRACE_ARG4_TYPE
) buffer
[i
]);
4319 /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */
4320 static int linux_supports_tracefork_flag
;
4323 linux_enable_event_reporting (int pid
)
4325 if (!linux_supports_tracefork_flag
)
4328 ptrace (PTRACE_SETOPTIONS
, pid
, 0, (PTRACE_ARG4_TYPE
) PTRACE_O_TRACECLONE
);
4331 /* Helper functions for linux_test_for_tracefork, called via clone (). */
4334 linux_tracefork_grandchild (void *arg
)
4339 #define STACK_SIZE 4096
4342 linux_tracefork_child (void *arg
)
4344 ptrace (PTRACE_TRACEME
, 0, 0, 0);
4345 kill (getpid (), SIGSTOP
);
4347 #if !(defined(__UCLIBC__) && defined(HAS_NOMMU))
4350 linux_tracefork_grandchild (NULL
);
4352 #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4355 __clone2 (linux_tracefork_grandchild
, arg
, STACK_SIZE
,
4356 CLONE_VM
| SIGCHLD
, NULL
);
4358 clone (linux_tracefork_grandchild
, (char *) arg
+ STACK_SIZE
,
4359 CLONE_VM
| SIGCHLD
, NULL
);
4362 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4367 /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make
4368 sure that we can enable the option, and that it had the desired
4372 linux_test_for_tracefork (void)
4374 int child_pid
, ret
, status
;
4376 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
4377 char *stack
= xmalloc (STACK_SIZE
* 4);
4378 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4380 linux_supports_tracefork_flag
= 0;
4382 #if !(defined(__UCLIBC__) && defined(HAS_NOMMU))
4384 child_pid
= fork ();
4386 linux_tracefork_child (NULL
);
4388 #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4390 /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */
4392 child_pid
= __clone2 (linux_tracefork_child
, stack
, STACK_SIZE
,
4393 CLONE_VM
| SIGCHLD
, stack
+ STACK_SIZE
* 2);
4394 #else /* !__ia64__ */
4395 child_pid
= clone (linux_tracefork_child
, stack
+ STACK_SIZE
,
4396 CLONE_VM
| SIGCHLD
, stack
+ STACK_SIZE
* 2);
4397 #endif /* !__ia64__ */
4399 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4401 if (child_pid
== -1)
4402 perror_with_name ("clone");
4404 ret
= my_waitpid (child_pid
, &status
, 0);
4406 perror_with_name ("waitpid");
4407 else if (ret
!= child_pid
)
4408 error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret
);
4409 if (! WIFSTOPPED (status
))
4410 error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status
);
4412 ret
= ptrace (PTRACE_SETOPTIONS
, child_pid
, 0,
4413 (PTRACE_ARG4_TYPE
) PTRACE_O_TRACEFORK
);
4416 ret
= ptrace (PTRACE_KILL
, child_pid
, 0, 0);
4419 warning ("linux_test_for_tracefork: failed to kill child");
4423 ret
= my_waitpid (child_pid
, &status
, 0);
4424 if (ret
!= child_pid
)
4425 warning ("linux_test_for_tracefork: failed to wait for killed child");
4426 else if (!WIFSIGNALED (status
))
4427 warning ("linux_test_for_tracefork: unexpected wait status 0x%x from "
4428 "killed child", status
);
4433 ret
= ptrace (PTRACE_CONT
, child_pid
, 0, 0);
4435 warning ("linux_test_for_tracefork: failed to resume child");
4437 ret
= my_waitpid (child_pid
, &status
, 0);
4439 if (ret
== child_pid
&& WIFSTOPPED (status
)
4440 && status
>> 16 == PTRACE_EVENT_FORK
)
4443 ret
= ptrace (PTRACE_GETEVENTMSG
, child_pid
, 0, &second_pid
);
4444 if (ret
== 0 && second_pid
!= 0)
4448 linux_supports_tracefork_flag
= 1;
4449 my_waitpid (second_pid
, &second_status
, 0);
4450 ret
= ptrace (PTRACE_KILL
, second_pid
, 0, 0);
4452 warning ("linux_test_for_tracefork: failed to kill second child");
4453 my_waitpid (second_pid
, &status
, 0);
4457 warning ("linux_test_for_tracefork: unexpected result from waitpid "
4458 "(%d, status 0x%x)", ret
, status
);
4462 ret
= ptrace (PTRACE_KILL
, child_pid
, 0, 0);
4464 warning ("linux_test_for_tracefork: failed to kill child");
4465 my_waitpid (child_pid
, &status
, 0);
4467 while (WIFSTOPPED (status
));
4469 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
4471 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4476 linux_look_up_symbols (void)
4478 #ifdef USE_THREAD_DB
4479 struct process_info
*proc
= current_process ();
4481 if (proc
->private->thread_db
!= NULL
)
4484 /* If the kernel supports tracing forks then it also supports tracing
4485 clones, and then we don't need to use the magic thread event breakpoint
4486 to learn about threads. */
4487 thread_db_init (!linux_supports_tracefork_flag
);
4492 linux_request_interrupt (void)
4494 extern unsigned long signal_pid
;
4496 if (!ptid_equal (cont_thread
, null_ptid
)
4497 && !ptid_equal (cont_thread
, minus_one_ptid
))
4499 struct lwp_info
*lwp
;
4502 lwp
= get_thread_lwp (current_inferior
);
4503 lwpid
= lwpid_of (lwp
);
4504 kill_lwp (lwpid
, SIGINT
);
4507 kill_lwp (signal_pid
, SIGINT
);
4510 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
4511 to debugger memory starting at MYADDR. */
4514 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
4516 char filename
[PATH_MAX
];
4518 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4520 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
4522 fd
= open (filename
, O_RDONLY
);
4526 if (offset
!= (CORE_ADDR
) 0
4527 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4530 n
= read (fd
, myaddr
, len
);
4537 /* These breakpoint and watchpoint related wrapper functions simply
4538 pass on the function call if the target has registered a
4539 corresponding function. */
4542 linux_insert_point (char type
, CORE_ADDR addr
, int len
)
4544 if (the_low_target
.insert_point
!= NULL
)
4545 return the_low_target
.insert_point (type
, addr
, len
);
4547 /* Unsupported (see target.h). */
4552 linux_remove_point (char type
, CORE_ADDR addr
, int len
)
4554 if (the_low_target
.remove_point
!= NULL
)
4555 return the_low_target
.remove_point (type
, addr
, len
);
4557 /* Unsupported (see target.h). */
4562 linux_stopped_by_watchpoint (void)
4564 struct lwp_info
*lwp
= get_thread_lwp (current_inferior
);
4566 return lwp
->stopped_by_watchpoint
;
4570 linux_stopped_data_address (void)
4572 struct lwp_info
*lwp
= get_thread_lwp (current_inferior
);
4574 return lwp
->stopped_data_address
;
4577 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
4578 #if defined(__mcoldfire__)
4579 /* These should really be defined in the kernel's ptrace.h header. */
4580 #define PT_TEXT_ADDR 49*4
4581 #define PT_DATA_ADDR 50*4
4582 #define PT_TEXT_END_ADDR 51*4
4584 #define PT_TEXT_ADDR 220
4585 #define PT_TEXT_END_ADDR 224
4586 #define PT_DATA_ADDR 228
4587 #elif defined(__TMS320C6X__)
4588 #define PT_TEXT_ADDR (0x10000*4)
4589 #define PT_DATA_ADDR (0x10004*4)
4590 #define PT_TEXT_END_ADDR (0x10008*4)
4593 /* Under uClinux, programs are loaded at non-zero offsets, which we need
4594 to tell gdb about. */
4597 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
4599 #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR)
4600 unsigned long text
, text_end
, data
;
4601 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4605 text
= ptrace (PTRACE_PEEKUSER
, pid
, (long)PT_TEXT_ADDR
, 0);
4606 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (long)PT_TEXT_END_ADDR
, 0);
4607 data
= ptrace (PTRACE_PEEKUSER
, pid
, (long)PT_DATA_ADDR
, 0);
4611 /* Both text and data offsets produced at compile-time (and so
4612 used by gdb) are relative to the beginning of the program,
4613 with the data segment immediately following the text segment.
4614 However, the actual runtime layout in memory may put the data
4615 somewhere else, so when we send gdb a data base-address, we
4616 use the real data base address and subtract the compile-time
4617 data base-address from it (which is just the length of the
4618 text segment). BSS immediately follows data in both
4621 *data_p
= data
- (text_end
- text
);
4631 linux_qxfer_osdata (const char *annex
,
4632 unsigned char *readbuf
, unsigned const char *writebuf
,
4633 CORE_ADDR offset
, int len
)
4635 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
4638 /* Convert a native/host siginfo object, into/from the siginfo in the
4639 layout of the inferiors' architecture. */
4642 siginfo_fixup (struct siginfo
*siginfo
, void *inf_siginfo
, int direction
)
4646 if (the_low_target
.siginfo_fixup
!= NULL
)
4647 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
4649 /* If there was no callback, or the callback didn't do anything,
4650 then just do a straight memcpy. */
4654 memcpy (siginfo
, inf_siginfo
, sizeof (struct siginfo
));
4656 memcpy (inf_siginfo
, siginfo
, sizeof (struct siginfo
));
4661 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
4662 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
4665 struct siginfo siginfo
;
4666 char inf_siginfo
[sizeof (struct siginfo
)];
4668 if (current_inferior
== NULL
)
4671 pid
= lwpid_of (get_thread_lwp (current_inferior
));
4674 fprintf (stderr
, "%s siginfo for lwp %d.\n",
4675 readbuf
!= NULL
? "Reading" : "Writing",
4678 if (offset
>= sizeof (siginfo
))
4681 if (ptrace (PTRACE_GETSIGINFO
, pid
, 0, &siginfo
) != 0)
4684 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
4685 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
4686 inferior with a 64-bit GDBSERVER should look the same as debugging it
4687 with a 32-bit GDBSERVER, we need to convert it. */
4688 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
4690 if (offset
+ len
> sizeof (siginfo
))
4691 len
= sizeof (siginfo
) - offset
;
4693 if (readbuf
!= NULL
)
4694 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
4697 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
4699 /* Convert back to ptrace layout before flushing it out. */
4700 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
4702 if (ptrace (PTRACE_SETSIGINFO
, pid
, 0, &siginfo
) != 0)
4709 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
4710 so we notice when children change state; as the handler for the
4711 sigsuspend in my_waitpid. */
4714 sigchld_handler (int signo
)
4716 int old_errno
= errno
;
4722 /* fprintf is not async-signal-safe, so call write
4724 if (write (2, "sigchld_handler\n",
4725 sizeof ("sigchld_handler\n") - 1) < 0)
4726 break; /* just ignore */
4730 if (target_is_async_p ())
4731 async_file_mark (); /* trigger a linux_wait */
4737 linux_supports_non_stop (void)
4743 linux_async (int enable
)
4745 int previous
= (linux_event_pipe
[0] != -1);
4748 fprintf (stderr
, "linux_async (%d), previous=%d\n",
4751 if (previous
!= enable
)
4754 sigemptyset (&mask
);
4755 sigaddset (&mask
, SIGCHLD
);
4757 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
4761 if (pipe (linux_event_pipe
) == -1)
4762 fatal ("creating event pipe failed.");
4764 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
4765 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
4767 /* Register the event loop handler. */
4768 add_file_handler (linux_event_pipe
[0],
4769 handle_target_event
, NULL
);
4771 /* Always trigger a linux_wait. */
4776 delete_file_handler (linux_event_pipe
[0]);
4778 close (linux_event_pipe
[0]);
4779 close (linux_event_pipe
[1]);
4780 linux_event_pipe
[0] = -1;
4781 linux_event_pipe
[1] = -1;
4784 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
4791 linux_start_non_stop (int nonstop
)
4793 /* Register or unregister from event-loop accordingly. */
4794 linux_async (nonstop
);
4799 linux_supports_multi_process (void)
4805 linux_supports_disable_randomization (void)
4807 #ifdef HAVE_PERSONALITY
4814 /* Enumerate spufs IDs for process PID. */
4816 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
4822 struct dirent
*entry
;
4824 sprintf (path
, "/proc/%ld/fd", pid
);
4825 dir
= opendir (path
);
4830 while ((entry
= readdir (dir
)) != NULL
)
4836 fd
= atoi (entry
->d_name
);
4840 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
4841 if (stat (path
, &st
) != 0)
4843 if (!S_ISDIR (st
.st_mode
))
4846 if (statfs (path
, &stfs
) != 0)
4848 if (stfs
.f_type
!= SPUFS_MAGIC
)
4851 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
4853 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
4863 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
4864 object type, using the /proc file system. */
4866 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
4867 unsigned const char *writebuf
,
4868 CORE_ADDR offset
, int len
)
4870 long pid
= lwpid_of (get_thread_lwp (current_inferior
));
4875 if (!writebuf
&& !readbuf
)
4883 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
4886 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
4887 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
4892 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4899 ret
= write (fd
, writebuf
, (size_t) len
);
4901 ret
= read (fd
, readbuf
, (size_t) len
);
4907 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
4908 struct target_loadseg
4910 /* Core address to which the segment is mapped. */
4912 /* VMA recorded in the program header. */
4914 /* Size of this segment in memory. */
4918 # if defined PT_GETDSBT
4919 struct target_loadmap
4921 /* Protocol version number, must be zero. */
4923 /* Pointer to the DSBT table, its size, and the DSBT index. */
4924 unsigned *dsbt_table
;
4925 unsigned dsbt_size
, dsbt_index
;
4926 /* Number of segments in this map. */
4928 /* The actual memory map. */
4929 struct target_loadseg segs
[/*nsegs*/];
4931 # define LINUX_LOADMAP PT_GETDSBT
4932 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
4933 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
4935 struct target_loadmap
4937 /* Protocol version number, must be zero. */
4939 /* Number of segments in this map. */
4941 /* The actual memory map. */
4942 struct target_loadseg segs
[/*nsegs*/];
4944 # define LINUX_LOADMAP PTRACE_GETFDPIC
4945 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
4946 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
4950 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
4951 unsigned char *myaddr
, unsigned int len
)
4953 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4955 struct target_loadmap
*data
= NULL
;
4956 unsigned int actual_length
, copy_length
;
4958 if (strcmp (annex
, "exec") == 0)
4959 addr
= (int) LINUX_LOADMAP_EXEC
;
4960 else if (strcmp (annex
, "interp") == 0)
4961 addr
= (int) LINUX_LOADMAP_INTERP
;
4965 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
4971 actual_length
= sizeof (struct target_loadmap
)
4972 + sizeof (struct target_loadseg
) * data
->nsegs
;
4974 if (offset
< 0 || offset
> actual_length
)
4977 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
4978 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
4982 # define linux_read_loadmap NULL
4983 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
4986 linux_process_qsupported (const char *query
)
4988 if (the_low_target
.process_qsupported
!= NULL
)
4989 the_low_target
.process_qsupported (query
);
4993 linux_supports_tracepoints (void)
4995 if (*the_low_target
.supports_tracepoints
== NULL
)
4998 return (*the_low_target
.supports_tracepoints
) ();
5002 linux_read_pc (struct regcache
*regcache
)
5004 if (the_low_target
.get_pc
== NULL
)
5007 return (*the_low_target
.get_pc
) (regcache
);
5011 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
5013 gdb_assert (the_low_target
.set_pc
!= NULL
);
5015 (*the_low_target
.set_pc
) (regcache
, pc
);
5019 linux_thread_stopped (struct thread_info
*thread
)
5021 return get_thread_lwp (thread
)->stopped
;
5024 /* This exposes stop-all-threads functionality to other modules. */
5027 linux_pause_all (int freeze
)
5029 stop_all_lwps (freeze
, NULL
);
5032 /* This exposes unstop-all-threads functionality to other gdbserver
5036 linux_unpause_all (int unfreeze
)
5038 unstop_all_lwps (unfreeze
, NULL
);
5042 linux_prepare_to_access_memory (void)
5044 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5047 linux_pause_all (1);
5052 linux_done_accessing_memory (void)
5054 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5057 linux_unpause_all (1);
5061 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
5062 CORE_ADDR collector
,
5065 CORE_ADDR
*jump_entry
,
5066 CORE_ADDR
*trampoline
,
5067 ULONGEST
*trampoline_size
,
5068 unsigned char *jjump_pad_insn
,
5069 ULONGEST
*jjump_pad_insn_size
,
5070 CORE_ADDR
*adjusted_insn_addr
,
5071 CORE_ADDR
*adjusted_insn_addr_end
,
5074 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
5075 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
5076 jump_entry
, trampoline
, trampoline_size
,
5077 jjump_pad_insn
, jjump_pad_insn_size
,
5078 adjusted_insn_addr
, adjusted_insn_addr_end
,
5082 static struct emit_ops
*
5083 linux_emit_ops (void)
5085 if (the_low_target
.emit_ops
!= NULL
)
5086 return (*the_low_target
.emit_ops
) ();
5092 linux_get_min_fast_tracepoint_insn_len (void)
5094 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
5097 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
5100 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
5101 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
5103 char filename
[PATH_MAX
];
5105 const int auxv_size
= is_elf64
5106 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
5107 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
5109 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5111 fd
= open (filename
, O_RDONLY
);
5117 while (read (fd
, buf
, auxv_size
) == auxv_size
5118 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
5122 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
5124 switch (aux
->a_type
)
5127 *phdr_memaddr
= aux
->a_un
.a_val
;
5130 *num_phdr
= aux
->a_un
.a_val
;
5136 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
5138 switch (aux
->a_type
)
5141 *phdr_memaddr
= aux
->a_un
.a_val
;
5144 *num_phdr
= aux
->a_un
.a_val
;
5152 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
5154 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
5155 "phdr_memaddr = %ld, phdr_num = %d",
5156 (long) *phdr_memaddr
, *num_phdr
);
5163 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
5166 get_dynamic (const int pid
, const int is_elf64
)
5168 CORE_ADDR phdr_memaddr
, relocation
;
5170 unsigned char *phdr_buf
;
5171 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
5173 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
5176 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
5177 phdr_buf
= alloca (num_phdr
* phdr_size
);
5179 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
5182 /* Compute relocation: it is expected to be 0 for "regular" executables,
5183 non-zero for PIE ones. */
5185 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
5188 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5190 if (p
->p_type
== PT_PHDR
)
5191 relocation
= phdr_memaddr
- p
->p_vaddr
;
5195 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5197 if (p
->p_type
== PT_PHDR
)
5198 relocation
= phdr_memaddr
- p
->p_vaddr
;
5201 if (relocation
== -1)
5203 warning ("Unexpected missing PT_PHDR");
5207 for (i
= 0; i
< num_phdr
; i
++)
5211 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5213 if (p
->p_type
== PT_DYNAMIC
)
5214 return p
->p_vaddr
+ relocation
;
5218 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5220 if (p
->p_type
== PT_DYNAMIC
)
5221 return p
->p_vaddr
+ relocation
;
5228 /* Return &_r_debug in the inferior, or -1 if not present. Return value
5229 can be 0 if the inferior does not yet have the library list initialized. */
5232 get_r_debug (const int pid
, const int is_elf64
)
5234 CORE_ADDR dynamic_memaddr
;
5235 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
5236 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
5238 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
5239 if (dynamic_memaddr
== 0)
5240 return (CORE_ADDR
) -1;
5242 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
5246 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
5248 if (dyn
->d_tag
== DT_DEBUG
)
5249 return dyn
->d_un
.d_val
;
5251 if (dyn
->d_tag
== DT_NULL
)
5256 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
5258 if (dyn
->d_tag
== DT_DEBUG
)
5259 return dyn
->d_un
.d_val
;
5261 if (dyn
->d_tag
== DT_NULL
)
5265 dynamic_memaddr
+= dyn_size
;
5268 return (CORE_ADDR
) -1;
5271 /* Read one pointer from MEMADDR in the inferior. */
5274 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
5277 return linux_read_memory (memaddr
, (unsigned char *) ptr
, ptr_size
);
5280 struct link_map_offsets
5282 /* Offset and size of r_debug.r_version. */
5283 int r_version_offset
;
5285 /* Offset and size of r_debug.r_map. */
5288 /* Offset to l_addr field in struct link_map. */
5291 /* Offset to l_name field in struct link_map. */
5294 /* Offset to l_ld field in struct link_map. */
5297 /* Offset to l_next field in struct link_map. */
5300 /* Offset to l_prev field in struct link_map. */
5304 /* Construct qXfer:libraries:read reply. */
5307 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
5308 unsigned const char *writebuf
,
5309 CORE_ADDR offset
, int len
)
5312 unsigned document_len
;
5313 struct process_info_private
*const priv
= current_process ()->private;
5314 char filename
[PATH_MAX
];
5317 static const struct link_map_offsets lmo_32bit_offsets
=
5319 0, /* r_version offset. */
5320 4, /* r_debug.r_map offset. */
5321 0, /* l_addr offset in link_map. */
5322 4, /* l_name offset in link_map. */
5323 8, /* l_ld offset in link_map. */
5324 12, /* l_next offset in link_map. */
5325 16 /* l_prev offset in link_map. */
5328 static const struct link_map_offsets lmo_64bit_offsets
=
5330 0, /* r_version offset. */
5331 8, /* r_debug.r_map offset. */
5332 0, /* l_addr offset in link_map. */
5333 8, /* l_name offset in link_map. */
5334 16, /* l_ld offset in link_map. */
5335 24, /* l_next offset in link_map. */
5336 32 /* l_prev offset in link_map. */
5338 const struct link_map_offsets
*lmo
;
5340 if (writebuf
!= NULL
)
5342 if (readbuf
== NULL
)
5345 pid
= lwpid_of (get_thread_lwp (current_inferior
));
5346 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
5347 is_elf64
= elf_64_file_p (filename
);
5348 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
5350 if (priv
->r_debug
== 0)
5351 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
5353 if (priv
->r_debug
== (CORE_ADDR
) -1 || priv
->r_debug
== 0)
5355 document
= xstrdup ("<library-list-svr4 version=\"1.0\"/>\n");
5359 int allocated
= 1024;
5361 const int ptr_size
= is_elf64
? 8 : 4;
5362 CORE_ADDR lm_addr
, lm_prev
, l_name
, l_addr
, l_ld
, l_next
, l_prev
;
5363 int r_version
, header_done
= 0;
5365 document
= xmalloc (allocated
);
5366 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
5367 p
= document
+ strlen (document
);
5370 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
5371 (unsigned char *) &r_version
,
5372 sizeof (r_version
)) != 0
5375 warning ("unexpected r_debug version %d", r_version
);
5379 if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
5380 &lm_addr
, ptr_size
) != 0)
5382 warning ("unable to read r_map from 0x%lx",
5383 (long) priv
->r_debug
+ lmo
->r_map_offset
);
5388 while (read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
5389 &l_name
, ptr_size
) == 0
5390 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
5391 &l_addr
, ptr_size
) == 0
5392 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
5393 &l_ld
, ptr_size
) == 0
5394 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
5395 &l_prev
, ptr_size
) == 0
5396 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
5397 &l_next
, ptr_size
) == 0)
5399 unsigned char libname
[PATH_MAX
];
5401 if (lm_prev
!= l_prev
)
5403 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
5404 (long) lm_prev
, (long) l_prev
);
5408 /* Not checking for error because reading may stop before
5409 we've got PATH_MAX worth of characters. */
5411 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
5412 libname
[sizeof (libname
) - 1] = '\0';
5413 if (libname
[0] != '\0')
5415 /* 6x the size for xml_escape_text below. */
5416 size_t len
= 6 * strlen ((char *) libname
);
5421 /* Terminate `<library-list-svr4'. */
5426 while (allocated
< p
- document
+ len
+ 200)
5428 /* Expand to guarantee sufficient storage. */
5429 uintptr_t document_len
= p
- document
;
5431 document
= xrealloc (document
, 2 * allocated
);
5433 p
= document
+ document_len
;
5436 name
= xml_escape_text ((char *) libname
);
5437 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
5438 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
5439 name
, (unsigned long) lm_addr
,
5440 (unsigned long) l_addr
, (unsigned long) l_ld
);
5443 else if (lm_prev
== 0)
5445 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
5456 strcpy (p
, "</library-list-svr4>");
5459 document_len
= strlen (document
);
5460 if (offset
< document_len
)
5461 document_len
-= offset
;
5464 if (len
> document_len
)
5467 memcpy (readbuf
, document
+ offset
, len
);
5473 static struct target_ops linux_target_ops
= {
5474 linux_create_inferior
,
5483 linux_fetch_registers
,
5484 linux_store_registers
,
5485 linux_prepare_to_access_memory
,
5486 linux_done_accessing_memory
,
5489 linux_look_up_symbols
,
5490 linux_request_interrupt
,
5494 linux_stopped_by_watchpoint
,
5495 linux_stopped_data_address
,
5496 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
5501 #ifdef USE_THREAD_DB
5502 thread_db_get_tls_address
,
5507 hostio_last_error_from_errno
,
5510 linux_supports_non_stop
,
5512 linux_start_non_stop
,
5513 linux_supports_multi_process
,
5514 #ifdef USE_THREAD_DB
5515 thread_db_handle_monitor_command
,
5519 linux_common_core_of_thread
,
5521 linux_process_qsupported
,
5522 linux_supports_tracepoints
,
5525 linux_thread_stopped
,
5529 linux_cancel_breakpoints
,
5530 linux_stabilize_threads
,
5531 linux_install_fast_tracepoint_jump_pad
,
5533 linux_supports_disable_randomization
,
5534 linux_get_min_fast_tracepoint_insn_len
,
5535 linux_qxfer_libraries_svr4
,
5539 linux_init_signals ()
5541 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
5542 to find what the cancel signal actually is. */
5543 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
5544 signal (__SIGRTMIN
+1, SIG_IGN
);
5549 initialize_low (void)
5551 struct sigaction sigchld_action
;
5552 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
5553 set_target_ops (&linux_target_ops
);
5554 set_breakpoint_data (the_low_target
.breakpoint
,
5555 the_low_target
.breakpoint_len
);
5556 linux_init_signals ();
5557 linux_test_for_tracefork ();
5558 #ifdef HAVE_LINUX_REGSETS
5559 for (num_regsets
= 0; target_regsets
[num_regsets
].size
>= 0; num_regsets
++)
5561 disabled_regsets
= xmalloc (num_regsets
);
5564 sigchld_action
.sa_handler
= sigchld_handler
;
5565 sigemptyset (&sigchld_action
.sa_mask
);
5566 sigchld_action
.sa_flags
= SA_RESTART
;
5567 sigaction (SIGCHLD
, &sigchld_action
, NULL
);